From d3849fd82ececd435ed97b5bb5775bc3c7fcc0eb Mon Sep 17 00:00:00 2001 From: Thiago Macieira Date: Fri, 16 Mar 2012 01:27:57 +0100 Subject: Don't build mdnssd This was enabled for Linux only, but Linux users should use Avahi, which is present on most modern distributions, and implements mDNS functionality. Reviewed-by: Tobias Hunger Reviewed-by: Fawzi Mohamed (cherry picked from commit 272e9a37f38896e899ce46355abcdd412fc247bc) Change-Id: I5e17ff9b8bff6eae9af2f8281937afdb687c371f Reviewed-by: Tobias Hunger --- src/tools/mdnssd/DNSCommon.c | 3153 ---------- src/tools/mdnssd/DNSCommon.h | 292 - src/tools/mdnssd/DNSDigest.c | 1584 ----- src/tools/mdnssd/DebugServices.h | 1607 ----- src/tools/mdnssd/GenLinkedList.c | 319 - src/tools/mdnssd/GenLinkedList.h | 90 - src/tools/mdnssd/PlatformCommon.c | 196 - src/tools/mdnssd/PlatformCommon.h | 18 - src/tools/mdnssd/PosixDaemon.c | 258 - src/tools/mdnssd/dns_sd.h | 2434 -------- src/tools/mdnssd/dnssd_ipc.c | 161 - src/tools/mdnssd/dnssd_ipc.h | 217 - src/tools/mdnssd/mDNS.c | 11521 ----------------------------------- src/tools/mdnssd/mDNSDebug.c | 93 - src/tools/mdnssd/mDNSDebug.h | 164 - src/tools/mdnssd/mDNSEmbeddedAPI.h | 2964 --------- src/tools/mdnssd/mDNSPosix.c | 1621 ----- src/tools/mdnssd/mDNSPosix.h | 85 - src/tools/mdnssd/mDNSUNP.c | 719 --- src/tools/mdnssd/mDNSUNP.h | 130 - src/tools/mdnssd/mdnssd.pro | 59 - src/tools/mdnssd/uDNS.c | 4927 --------------- src/tools/mdnssd/uDNS.h | 136 - src/tools/mdnssd/uds_daemon.c | 4716 -------------- src/tools/mdnssd/uds_daemon.h | 80 - src/tools/tools.pro | 4 - 26 files changed, 37548 deletions(-) delete mode 100644 src/tools/mdnssd/DNSCommon.c delete mode 100644 src/tools/mdnssd/DNSCommon.h delete mode 100644 src/tools/mdnssd/DNSDigest.c delete mode 100644 src/tools/mdnssd/DebugServices.h delete mode 100644 src/tools/mdnssd/GenLinkedList.c delete mode 100644 src/tools/mdnssd/GenLinkedList.h delete mode 100644 src/tools/mdnssd/PlatformCommon.c delete mode 100644 src/tools/mdnssd/PlatformCommon.h delete mode 100644 src/tools/mdnssd/PosixDaemon.c delete mode 100644 src/tools/mdnssd/dns_sd.h delete mode 100644 src/tools/mdnssd/dnssd_ipc.c delete mode 100644 src/tools/mdnssd/dnssd_ipc.h delete mode 100644 src/tools/mdnssd/mDNS.c delete mode 100644 src/tools/mdnssd/mDNSDebug.c delete mode 100755 src/tools/mdnssd/mDNSDebug.h delete mode 100755 src/tools/mdnssd/mDNSEmbeddedAPI.h delete mode 100755 src/tools/mdnssd/mDNSPosix.c delete mode 100755 src/tools/mdnssd/mDNSPosix.h delete mode 100755 src/tools/mdnssd/mDNSUNP.c delete mode 100755 src/tools/mdnssd/mDNSUNP.h delete mode 100644 src/tools/mdnssd/mdnssd.pro delete mode 100755 src/tools/mdnssd/uDNS.c delete mode 100755 src/tools/mdnssd/uDNS.h delete mode 100644 src/tools/mdnssd/uds_daemon.c delete mode 100644 src/tools/mdnssd/uds_daemon.h (limited to 'src') diff --git a/src/tools/mdnssd/DNSCommon.c b/src/tools/mdnssd/DNSCommon.c deleted file mode 100644 index e526068339..0000000000 --- a/src/tools/mdnssd/DNSCommon.c +++ /dev/null @@ -1,3153 +0,0 @@ -/* -*- Mode: C; tab-width: 4 -*- - * - * Copyright (c) 2002-2003 Apple Computer, Inc. All rights reserved. - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -// Set mDNS_InstantiateInlines to tell mDNSEmbeddedAPI.h to instantiate inline functions, if necessary -#define mDNS_InstantiateInlines 1 -#include "DNSCommon.h" - -// Disable certain benign warnings with Microsoft compilers -#if (defined(_MSC_VER)) - // Disable "conditional expression is constant" warning for debug macros. - // Otherwise, this generates warnings for the perfectly natural construct "while(1)" - // If someone knows a variant way of writing "while(1)" that doesn't generate warning messages, please let us know - #pragma warning(disable:4127) - // Disable "array is too small to include a terminating null character" warning - // -- domain labels have an initial length byte, not a terminating null character - #pragma warning(disable:4295) -#endif - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - Program Constants -#endif - -mDNSexport const mDNSInterfaceID mDNSInterface_Any = 0; -mDNSexport const mDNSInterfaceID mDNSInterfaceMark = (mDNSInterfaceID)-1; -mDNSexport const mDNSInterfaceID mDNSInterface_LocalOnly = (mDNSInterfaceID)-2; -mDNSexport const mDNSInterfaceID mDNSInterface_Unicast = (mDNSInterfaceID)-3; -mDNSexport const mDNSInterfaceID mDNSInterface_P2P = (mDNSInterfaceID)-4; - -// Note: Microsoft's proposed "Link Local Multicast Name Resolution Protocol" (LLMNR) is essentially a limited version of -// Multicast DNS, using the same packet formats, naming syntax, and record types as Multicast DNS, but on a different UDP -// port and multicast address, which means it won't interoperate with the existing installed base of Multicast DNS responders. -// LLMNR uses IPv4 multicast address 224.0.0.252, IPv6 multicast address FF02::0001:0003, and UDP port 5355. -// Uncomment the appropriate lines below to build a special Multicast DNS responder for testing interoperability -// with Microsoft's LLMNR client code. - -#define DiscardPortAsNumber 9 -#define SSHPortAsNumber 22 -#define UnicastDNSPortAsNumber 53 -#define SSDPPortAsNumber 1900 -#define IPSECPortAsNumber 4500 -#define NSIPCPortAsNumber 5030 // Port used for dnsextd to talk to local nameserver bound to loopback -#define NATPMPAnnouncementPortAsNumber 5350 -#define NATPMPPortAsNumber 5351 -#define DNSEXTPortAsNumber 5352 // Port used for end-to-end DNS operations like LLQ, Updates with Leases, etc. -#define MulticastDNSPortAsNumber 5353 -#define LoopbackIPCPortAsNumber 5354 -//#define MulticastDNSPortAsNumber 5355 // LLMNR -#define PrivateDNSPortAsNumber 5533 - -mDNSexport const mDNSIPPort DiscardPort = { { DiscardPortAsNumber >> 8, DiscardPortAsNumber & 0xFF } }; -mDNSexport const mDNSIPPort SSHPort = { { SSHPortAsNumber >> 8, SSHPortAsNumber & 0xFF } }; -mDNSexport const mDNSIPPort UnicastDNSPort = { { UnicastDNSPortAsNumber >> 8, UnicastDNSPortAsNumber & 0xFF } }; -mDNSexport const mDNSIPPort SSDPPort = { { SSDPPortAsNumber >> 8, SSDPPortAsNumber & 0xFF } }; -mDNSexport const mDNSIPPort IPSECPort = { { IPSECPortAsNumber >> 8, IPSECPortAsNumber & 0xFF } }; -mDNSexport const mDNSIPPort NSIPCPort = { { NSIPCPortAsNumber >> 8, NSIPCPortAsNumber & 0xFF } }; -mDNSexport const mDNSIPPort NATPMPAnnouncementPort = { { NATPMPAnnouncementPortAsNumber >> 8, NATPMPAnnouncementPortAsNumber & 0xFF } }; -mDNSexport const mDNSIPPort NATPMPPort = { { NATPMPPortAsNumber >> 8, NATPMPPortAsNumber & 0xFF } }; -mDNSexport const mDNSIPPort DNSEXTPort = { { DNSEXTPortAsNumber >> 8, DNSEXTPortAsNumber & 0xFF } }; -mDNSexport const mDNSIPPort MulticastDNSPort = { { MulticastDNSPortAsNumber >> 8, MulticastDNSPortAsNumber & 0xFF } }; -mDNSexport const mDNSIPPort LoopbackIPCPort = { { LoopbackIPCPortAsNumber >> 8, LoopbackIPCPortAsNumber & 0xFF } }; -mDNSexport const mDNSIPPort PrivateDNSPort = { { PrivateDNSPortAsNumber >> 8, PrivateDNSPortAsNumber & 0xFF } }; - -mDNSexport const OwnerOptData zeroOwner = { 0, 0, { { 0 } }, { { 0 } }, { { 0 } } }; - -mDNSexport const mDNSIPPort zeroIPPort = { { 0 } }; -mDNSexport const mDNSv4Addr zerov4Addr = { { 0 } }; -mDNSexport const mDNSv6Addr zerov6Addr = { { 0 } }; -mDNSexport const mDNSEthAddr zeroEthAddr = { { 0 } }; -mDNSexport const mDNSv4Addr onesIPv4Addr = { { 255, 255, 255, 255 } }; -mDNSexport const mDNSv6Addr onesIPv6Addr = { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 } }; -mDNSexport const mDNSEthAddr onesEthAddr = { { 255, 255, 255, 255, 255, 255 } }; -mDNSexport const mDNSAddr zeroAddr = { mDNSAddrType_None, {{{ 0 }}} }; - -mDNSexport const mDNSv4Addr AllDNSAdminGroup = { { 239, 255, 255, 251 } }; -mDNSexport const mDNSv4Addr AllHosts_v4 = { { 224, 0, 0, 1 } }; // For NAT-PMP Annoucements -mDNSexport const mDNSv6Addr AllHosts_v6 = { { 0xFF,0x02,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x01 } }; -mDNSexport const mDNSv6Addr NDP_prefix = { { 0xFF,0x02,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x01, 0xFF,0x00,0x00,0xFB } }; // FF02:0:0:0:0:1:FF00::/104 -mDNSexport const mDNSEthAddr AllHosts_v6_Eth = { { 0x33, 0x33, 0x00, 0x00, 0x00, 0x01 } }; -mDNSexport const mDNSAddr AllDNSLinkGroup_v4 = { mDNSAddrType_IPv4, { { { 224, 0, 0, 251 } } } }; -//mDNSexport const mDNSAddr AllDNSLinkGroup_v4 = { mDNSAddrType_IPv4, { { { 224, 0, 0, 252 } } } }; // LLMNR -mDNSexport const mDNSAddr AllDNSLinkGroup_v6 = { mDNSAddrType_IPv6, { { { 0xFF,0x02,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0xFB } } } }; -//mDNSexport const mDNSAddr AllDNSLinkGroup_v6 = { mDNSAddrType_IPv6, { { { 0xFF,0x02,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x01,0x00,0x03 } } } }; // LLMNR - -mDNSexport const mDNSOpaque16 zeroID = { { 0, 0 } }; -mDNSexport const mDNSOpaque16 onesID = { { 255, 255 } }; -mDNSexport const mDNSOpaque16 QueryFlags = { { kDNSFlag0_QR_Query | kDNSFlag0_OP_StdQuery, 0 } }; -mDNSexport const mDNSOpaque16 uQueryFlags = { { kDNSFlag0_QR_Query | kDNSFlag0_OP_StdQuery | kDNSFlag0_RD, 0 } }; -mDNSexport const mDNSOpaque16 ResponseFlags = { { kDNSFlag0_QR_Response | kDNSFlag0_OP_StdQuery | kDNSFlag0_AA, 0 } }; -mDNSexport const mDNSOpaque16 UpdateReqFlags = { { kDNSFlag0_QR_Query | kDNSFlag0_OP_Update, 0 } }; -mDNSexport const mDNSOpaque16 UpdateRespFlags = { { kDNSFlag0_QR_Response | kDNSFlag0_OP_Update, 0 } }; - -mDNSexport const mDNSOpaque64 zeroOpaque64 = { { 0 } }; - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - General Utility Functions -#endif - -// return true for RFC1918 private addresses -mDNSexport mDNSBool mDNSv4AddrIsRFC1918(mDNSv4Addr *addr) - { - return ((addr->b[0] == 10) || // 10/8 prefix - (addr->b[0] == 172 && (addr->b[1] & 0xF0) == 16) || // 172.16/12 - (addr->b[0] == 192 && addr->b[1] == 168)); // 192.168/16 - } - -mDNSexport NetworkInterfaceInfo *GetFirstActiveInterface(NetworkInterfaceInfo *intf) - { - while (intf && !intf->InterfaceActive) intf = intf->next; - return(intf); - } - -mDNSexport mDNSInterfaceID GetNextActiveInterfaceID(const NetworkInterfaceInfo *intf) - { - const NetworkInterfaceInfo *next = GetFirstActiveInterface(intf->next); - if (next) return(next->InterfaceID); else return(mDNSNULL); - } - -mDNSexport mDNSu32 NumCacheRecordsForInterfaceID(const mDNS *const m, mDNSInterfaceID id) - { - mDNSu32 slot, used = 0; - CacheGroup *cg; - const CacheRecord *rr; - FORALL_CACHERECORDS(slot, cg, rr) - if (rr->resrec.InterfaceID == id) used++; - return(used); - } - -mDNSexport char *DNSTypeName(mDNSu16 rrtype) - { - switch (rrtype) - { - case kDNSType_A: return("Addr"); - case kDNSType_NS: return("NS"); - case kDNSType_CNAME:return("CNAME"); - case kDNSType_SOA: return("SOA"); - case kDNSType_NULL: return("NULL"); - case kDNSType_PTR: return("PTR"); - case kDNSType_HINFO:return("HINFO"); - case kDNSType_TXT: return("TXT"); - case kDNSType_AAAA: return("AAAA"); - case kDNSType_SRV: return("SRV"); - case kDNSType_OPT: return("OPT"); - case kDNSType_NSEC: return("NSEC"); - case kDNSType_TSIG: return("TSIG"); - case kDNSQType_ANY: return("ANY"); - default: { - static char buffer[16]; - mDNS_snprintf(buffer, sizeof(buffer), "(%d)", rrtype); - return(buffer); - } - } - } - -// Note slight bug: this code uses the rdlength from the ResourceRecord object, to display -// the rdata from the RDataBody object. Sometimes this could be the wrong length -- but as -// long as this routine is only used for debugging messages, it probably isn't a big problem. -mDNSexport char *GetRRDisplayString_rdb(const ResourceRecord *const rr, const RDataBody *const rd1, char *const buffer) - { - const RDataBody2 *const rd = (RDataBody2 *)rd1; - #define RemSpc (MaxMsg-1-length) - char *ptr = buffer; - mDNSu32 length = mDNS_snprintf(buffer, MaxMsg-1, "%4d %##s %s ", rr->rdlength, rr->name->c, DNSTypeName(rr->rrtype)); - if (rr->RecordType == kDNSRecordTypePacketNegative) return(buffer); - if (!rr->rdlength) { mDNS_snprintf(buffer+length, RemSpc, "<< ZERO RDATA LENGTH >>"); return(buffer); } - - switch (rr->rrtype) - { - case kDNSType_A: mDNS_snprintf(buffer+length, RemSpc, "%.4a", &rd->ipv4); break; - - case kDNSType_NS: // Same as PTR - case kDNSType_CNAME:// Same as PTR - case kDNSType_PTR: mDNS_snprintf(buffer+length, RemSpc, "%##s", rd->name.c); break; - - case kDNSType_SOA: mDNS_snprintf(buffer+length, RemSpc, "%##s %##s %d %d %d %d %d", - rd->soa.mname.c, rd->soa.rname.c, - rd->soa.serial, rd->soa.refresh, rd->soa.retry, rd->soa.expire, rd->soa.min); - break; - - case kDNSType_HINFO:// Display this the same as TXT (show all constituent strings) - case kDNSType_TXT: { - const mDNSu8 *t = rd->txt.c; - while (t < rd->txt.c + rr->rdlength) - { - length += mDNS_snprintf(buffer+length, RemSpc, "%s%#s", t > rd->txt.c ? "|" : "", t); - t += 1 + t[0]; - } - } break; - - case kDNSType_AAAA: mDNS_snprintf(buffer+length, RemSpc, "%.16a", &rd->ipv6); break; - case kDNSType_SRV: mDNS_snprintf(buffer+length, RemSpc, "%u %u %u %##s", - rd->srv.priority, rd->srv.weight, mDNSVal16(rd->srv.port), rd->srv.target.c); break; - - case kDNSType_OPT: { - const rdataOPT *opt; - const rdataOPT *const end = (const rdataOPT *)&rd->data[rr->rdlength]; - length += mDNS_snprintf(buffer+length, RemSpc, "Max %d", rr->rrclass); - for (opt = &rd->opt[0]; opt < end; opt++) - { - switch(opt->opt) - { - case kDNSOpt_LLQ: - length += mDNS_snprintf(buffer+length, RemSpc, " Vers %d", opt->u.llq.vers); - length += mDNS_snprintf(buffer+length, RemSpc, " Op %d", opt->u.llq.llqOp); - length += mDNS_snprintf(buffer+length, RemSpc, " Err/Port %d", opt->u.llq.err); - length += mDNS_snprintf(buffer+length, RemSpc, " ID %08X%08X", opt->u.llq.id.l[0], opt->u.llq.id.l[1]); - length += mDNS_snprintf(buffer+length, RemSpc, " Lease %d", opt->u.llq.llqlease); - break; - case kDNSOpt_Lease: - length += mDNS_snprintf(buffer+length, RemSpc, " Lease %d", opt->u.updatelease); - break; - case kDNSOpt_Owner: - length += mDNS_snprintf(buffer+length, RemSpc, " Vers %d", opt->u.owner.vers); - length += mDNS_snprintf(buffer+length, RemSpc, " Seq %3d", (mDNSu8)opt->u.owner.seq); // Display as unsigned - length += mDNS_snprintf(buffer+length, RemSpc, " MAC %.6a", opt->u.owner.HMAC.b); - if (opt->optlen >= DNSOpt_OwnerData_ID_Wake_Space-4) - { - length += mDNS_snprintf(buffer+length, RemSpc, " I-MAC %.6a", opt->u.owner.IMAC.b); - if (opt->optlen > DNSOpt_OwnerData_ID_Wake_Space-4) - length += mDNS_snprintf(buffer+length, RemSpc, " Password %.6a", opt->u.owner.password.b); - } - break; - default: - length += mDNS_snprintf(buffer+length, RemSpc, " Unknown %d", opt->opt); - break; - } - } - } - break; - - case kDNSType_NSEC: { - mDNSu16 i; - for (i=0; i<255; i++) - if (rd->nsec.bitmap[i>>3] & (128 >> (i&7))) - length += mDNS_snprintf(buffer+length, RemSpc, "%s ", DNSTypeName(i)); - } - break; - - default: mDNS_snprintf(buffer+length, RemSpc, "RDLen %d: %s", rr->rdlength, rd->data); - // Really should scan buffer to check if text is valid UTF-8 and only replace with dots if not - for (ptr = buffer; *ptr; ptr++) if (*ptr < ' ') *ptr = '.'; - break; - } - return(buffer); - } - -// See comments in mDNSEmbeddedAPI.h -#if _PLATFORM_HAS_STRONG_PRNG_ -#define mDNSRandomNumber mDNSPlatformRandomNumber -#else -mDNSlocal mDNSu32 mDNSRandomFromSeed(mDNSu32 seed) - { - return seed * 21 + 1; - } - -mDNSlocal mDNSu32 mDNSMixRandomSeed(mDNSu32 seed, mDNSu8 iteration) - { - return iteration ? mDNSMixRandomSeed(mDNSRandomFromSeed(seed), --iteration) : seed; - } - -mDNSlocal mDNSu32 mDNSRandomNumber() - { - static mDNSBool seeded = mDNSfalse; - static mDNSu32 seed = 0; - if (!seeded) - { - seed = mDNSMixRandomSeed(mDNSPlatformRandomSeed(), 100); - seeded = mDNStrue; - } - return (seed = mDNSRandomFromSeed(seed)); - } -#endif // ! _PLATFORM_HAS_STRONG_PRNG_ - -mDNSexport mDNSu32 mDNSRandom(mDNSu32 max) // Returns pseudo-random result from zero to max inclusive - { - mDNSu32 ret = 0; - mDNSu32 mask = 1; - - while (mask < max) mask = (mask << 1) | 1; - - do ret = mDNSRandomNumber() & mask; - while (ret > max); - - return ret; - } - -mDNSexport mDNSBool mDNSSameAddress(const mDNSAddr *ip1, const mDNSAddr *ip2) - { - if (ip1->type == ip2->type) - { - switch (ip1->type) - { - case mDNSAddrType_None : return(mDNStrue); // Empty addresses have no data and are therefore always equal - case mDNSAddrType_IPv4 : return(mDNSBool)(mDNSSameIPv4Address(ip1->ip.v4, ip2->ip.v4)); - case mDNSAddrType_IPv6 : return(mDNSBool)(mDNSSameIPv6Address(ip1->ip.v6, ip2->ip.v6)); - } - } - return(mDNSfalse); - } - -mDNSexport mDNSBool mDNSAddrIsDNSMulticast(const mDNSAddr *ip) - { - switch(ip->type) - { - case mDNSAddrType_IPv4: return(mDNSBool)(mDNSSameIPv4Address(ip->ip.v4, AllDNSLinkGroup_v4.ip.v4)); - case mDNSAddrType_IPv6: return(mDNSBool)(mDNSSameIPv6Address(ip->ip.v6, AllDNSLinkGroup_v6.ip.v6)); - default: return(mDNSfalse); - } - } - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - Domain Name Utility Functions -#endif - -mDNSexport mDNSBool SameDomainLabel(const mDNSu8 *a, const mDNSu8 *b) - { - int i; - const int len = *a++; - - if (len > MAX_DOMAIN_LABEL) - { debugf("Malformed label (too long)"); return(mDNSfalse); } - - if (len != *b++) return(mDNSfalse); - for (i=0; ic; - const mDNSu8 * b = d2->c; - const mDNSu8 *const max = d1->c + MAX_DOMAIN_NAME; // Maximum that's valid - - while (*a || *b) - { - if (a + 1 + *a >= max) - { debugf("Malformed domain name (more than 256 characters)"); return(mDNSfalse); } - if (!SameDomainLabel(a, b)) return(mDNSfalse); - a += 1 + *a; - b += 1 + *b; - } - - return(mDNStrue); - } - -mDNSexport mDNSBool SameDomainNameCS(const domainname *const d1, const domainname *const d2) - { - mDNSu16 l1 = DomainNameLength(d1); - mDNSu16 l2 = DomainNameLength(d2); - return(l1 <= MAX_DOMAIN_NAME && l1 == l2 && mDNSPlatformMemSame(d1, d2, l1)); - } - -mDNSexport mDNSBool IsLocalDomain(const domainname *d) - { - // Domains that are defined to be resolved via link-local multicast are: - // local., 254.169.in-addr.arpa., and {8,9,A,B}.E.F.ip6.arpa. - static const domainname *nL = (const domainname*)"\x5" "local"; - static const domainname *nR = (const domainname*)"\x3" "254" "\x3" "169" "\x7" "in-addr" "\x4" "arpa"; - static const domainname *n8 = (const domainname*)"\x1" "8" "\x1" "e" "\x1" "f" "\x3" "ip6" "\x4" "arpa"; - static const domainname *n9 = (const domainname*)"\x1" "9" "\x1" "e" "\x1" "f" "\x3" "ip6" "\x4" "arpa"; - static const domainname *nA = (const domainname*)"\x1" "a" "\x1" "e" "\x1" "f" "\x3" "ip6" "\x4" "arpa"; - static const domainname *nB = (const domainname*)"\x1" "b" "\x1" "e" "\x1" "f" "\x3" "ip6" "\x4" "arpa"; - - const domainname *d1, *d2, *d3, *d4, *d5; // Top-level domain, second-level domain, etc. - d1 = d2 = d3 = d4 = d5 = mDNSNULL; - while (d->c[0]) - { - d5 = d4; d4 = d3; d3 = d2; d2 = d1; d1 = d; - d = (const domainname*)(d->c + 1 + d->c[0]); - } - - if (d1 && SameDomainName(d1, nL)) return(mDNStrue); - if (d4 && SameDomainName(d4, nR)) return(mDNStrue); - if (d5 && SameDomainName(d5, n8)) return(mDNStrue); - if (d5 && SameDomainName(d5, n9)) return(mDNStrue); - if (d5 && SameDomainName(d5, nA)) return(mDNStrue); - if (d5 && SameDomainName(d5, nB)) return(mDNStrue); - return(mDNSfalse); - } - -mDNSexport const mDNSu8 *LastLabel(const domainname *d) - { - const mDNSu8 *p = d->c; - while (d->c[0]) - { - p = d->c; - d = (const domainname*)(d->c + 1 + d->c[0]); - } - return(p); - } - -// Returns length of a domain name INCLUDING the byte for the final null label -// e.g. for the root label "." it returns one -// For the FQDN "com." it returns 5 (length byte, three data bytes, final zero) -// Legal results are 1 (just root label) to 256 (MAX_DOMAIN_NAME) -// If the given domainname is invalid, result is 257 (MAX_DOMAIN_NAME+1) -mDNSexport mDNSu16 DomainNameLengthLimit(const domainname *const name, const mDNSu8 *limit) - { - const mDNSu8 *src = name->c; - while (src < limit && *src <= MAX_DOMAIN_LABEL) - { - if (*src == 0) return((mDNSu16)(src - name->c + 1)); - src += 1 + *src; - } - return(MAX_DOMAIN_NAME+1); - } - -// CompressedDomainNameLength returns the length of a domain name INCLUDING the byte -// for the final null label, e.g. for the root label "." it returns one. -// E.g. for the FQDN "foo.com." it returns 9 -// (length, three data bytes, length, three more data bytes, final zero). -// In the case where a parent domain name is provided, and the given name is a child -// of that parent, CompressedDomainNameLength returns the length of the prefix portion -// of the child name, plus TWO bytes for the compression pointer. -// E.g. for the name "foo.com." with parent "com.", it returns 6 -// (length, three data bytes, two-byte compression pointer). -mDNSexport mDNSu16 CompressedDomainNameLength(const domainname *const name, const domainname *parent) - { - const mDNSu8 *src = name->c; - if (parent && parent->c[0] == 0) parent = mDNSNULL; - while (*src) - { - if (*src > MAX_DOMAIN_LABEL) return(MAX_DOMAIN_NAME+1); - if (parent && SameDomainName((const domainname *)src, parent)) return((mDNSu16)(src - name->c + 2)); - src += 1 + *src; - if (src - name->c >= MAX_DOMAIN_NAME) return(MAX_DOMAIN_NAME+1); - } - return((mDNSu16)(src - name->c + 1)); - } - -// CountLabels() returns number of labels in name, excluding final root label -// (e.g. for "apple.com." CountLabels returns 2.) -mDNSexport int CountLabels(const domainname *d) - { - int count = 0; - const mDNSu8 *ptr; - for (ptr = d->c; *ptr; ptr = ptr + ptr[0] + 1) count++; - return count; - } - -// SkipLeadingLabels skips over the first 'skip' labels in the domainname, -// returning a pointer to the suffix with 'skip' labels removed. -mDNSexport const domainname *SkipLeadingLabels(const domainname *d, int skip) - { - while (skip > 0 && d->c[0]) { d = (const domainname *)(d->c + 1 + d->c[0]); skip--; } - return(d); - } - -// AppendLiteralLabelString appends a single label to an existing (possibly empty) domainname. -// The C string contains the label as-is, with no escaping, etc. -// Any dots in the name are literal dots, not label separators -// If successful, AppendLiteralLabelString returns a pointer to the next unused byte -// in the domainname bufer (i.e. the next byte after the terminating zero). -// If unable to construct a legal domain name (i.e. label more than 63 bytes, or total more than 256 bytes) -// AppendLiteralLabelString returns mDNSNULL. -mDNSexport mDNSu8 *AppendLiteralLabelString(domainname *const name, const char *cstr) - { - mDNSu8 * ptr = name->c + DomainNameLength(name) - 1; // Find end of current name - const mDNSu8 *const lim1 = name->c + MAX_DOMAIN_NAME - 1; // Limit of how much we can add (not counting final zero) - const mDNSu8 *const lim2 = ptr + 1 + MAX_DOMAIN_LABEL; - const mDNSu8 *const lim = (lim1 < lim2) ? lim1 : lim2; - mDNSu8 *lengthbyte = ptr++; // Record where the length is going to go - - while (*cstr && ptr < lim) *ptr++ = (mDNSu8)*cstr++; // Copy the data - *lengthbyte = (mDNSu8)(ptr - lengthbyte - 1); // Fill in the length byte - *ptr++ = 0; // Put the null root label on the end - if (*cstr) return(mDNSNULL); // Failure: We didn't successfully consume all input - else return(ptr); // Success: return new value of ptr - } - -// AppendDNSNameString appends zero or more labels to an existing (possibly empty) domainname. -// The C string is in conventional DNS syntax: -// Textual labels, escaped as necessary using the usual DNS '\' notation, separated by dots. -// If successful, AppendDNSNameString returns a pointer to the next unused byte -// in the domainname bufer (i.e. the next byte after the terminating zero). -// If unable to construct a legal domain name (i.e. label more than 63 bytes, or total more than 256 bytes) -// AppendDNSNameString returns mDNSNULL. -mDNSexport mDNSu8 *AppendDNSNameString(domainname *const name, const char *cstring) - { - const char *cstr = cstring; - mDNSu8 * ptr = name->c + DomainNameLength(name) - 1; // Find end of current name - const mDNSu8 *const lim = name->c + MAX_DOMAIN_NAME - 1; // Limit of how much we can add (not counting final zero) - while (*cstr && ptr < lim) // While more characters, and space to put them... - { - mDNSu8 *lengthbyte = ptr++; // Record where the length is going to go - if (*cstr == '.') { LogMsg("AppendDNSNameString: Illegal empty label in name \"%s\"", cstring); return(mDNSNULL); } - while (*cstr && *cstr != '.' && ptr < lim) // While we have characters in the label... - { - mDNSu8 c = (mDNSu8)*cstr++; // Read the character - if (c == '\\') // If escape character, check next character - { - c = (mDNSu8)*cstr++; // Assume we'll just take the next character - if (mDNSIsDigit(cstr[-1]) && mDNSIsDigit(cstr[0]) && mDNSIsDigit(cstr[1])) - { // If three decimal digits, - int v0 = cstr[-1] - '0'; // then interpret as three-digit decimal - int v1 = cstr[ 0] - '0'; - int v2 = cstr[ 1] - '0'; - int val = v0 * 100 + v1 * 10 + v2; - if (val <= 255) { c = (mDNSu8)val; cstr += 2; } // If valid three-digit decimal value, use it - } - } - *ptr++ = c; // Write the character - } - if (*cstr) cstr++; // Skip over the trailing dot (if present) - if (ptr - lengthbyte - 1 > MAX_DOMAIN_LABEL) // If illegal label, abort - return(mDNSNULL); - *lengthbyte = (mDNSu8)(ptr - lengthbyte - 1); // Fill in the length byte - } - - *ptr++ = 0; // Put the null root label on the end - if (*cstr) return(mDNSNULL); // Failure: We didn't successfully consume all input - else return(ptr); // Success: return new value of ptr - } - -// AppendDomainLabel appends a single label to a name. -// If successful, AppendDomainLabel returns a pointer to the next unused byte -// in the domainname bufer (i.e. the next byte after the terminating zero). -// If unable to construct a legal domain name (i.e. label more than 63 bytes, or total more than 256 bytes) -// AppendDomainLabel returns mDNSNULL. -mDNSexport mDNSu8 *AppendDomainLabel(domainname *const name, const domainlabel *const label) - { - int i; - mDNSu8 *ptr = name->c + DomainNameLength(name) - 1; - - // Check label is legal - if (label->c[0] > MAX_DOMAIN_LABEL) return(mDNSNULL); - - // Check that ptr + length byte + data bytes + final zero does not exceed our limit - if (ptr + 1 + label->c[0] + 1 > name->c + MAX_DOMAIN_NAME) return(mDNSNULL); - - for (i=0; i<=label->c[0]; i++) *ptr++ = label->c[i]; // Copy the label data - *ptr++ = 0; // Put the null root label on the end - return(ptr); - } - -mDNSexport mDNSu8 *AppendDomainName(domainname *const name, const domainname *const append) - { - mDNSu8 * ptr = name->c + DomainNameLength(name) - 1; // Find end of current name - const mDNSu8 *const lim = name->c + MAX_DOMAIN_NAME - 1; // Limit of how much we can add (not counting final zero) - const mDNSu8 * src = append->c; - while (src[0]) - { - int i; - if (ptr + 1 + src[0] > lim) return(mDNSNULL); - for (i=0; i<=src[0]; i++) *ptr++ = src[i]; - *ptr = 0; // Put the null root label on the end - src += i; - } - return(ptr); - } - -// MakeDomainLabelFromLiteralString makes a single domain label from a single literal C string (with no escaping). -// If successful, MakeDomainLabelFromLiteralString returns mDNStrue. -// If unable to convert the whole string to a legal domain label (i.e. because length is more than 63 bytes) then -// MakeDomainLabelFromLiteralString makes a legal domain label from the first 63 bytes of the string and returns mDNSfalse. -// In some cases silently truncated oversized names to 63 bytes is acceptable, so the return result may be ignored. -// In other cases silent truncation may not be acceptable, so in those cases the calling function needs to check the return result. -mDNSexport mDNSBool MakeDomainLabelFromLiteralString(domainlabel *const label, const char *cstr) - { - mDNSu8 * ptr = label->c + 1; // Where we're putting it - const mDNSu8 *const limit = label->c + 1 + MAX_DOMAIN_LABEL; // The maximum we can put - while (*cstr && ptr < limit) *ptr++ = (mDNSu8)*cstr++; // Copy the label - label->c[0] = (mDNSu8)(ptr - label->c - 1); // Set the length byte - return(*cstr == 0); // Return mDNStrue if we successfully consumed all input - } - -// MakeDomainNameFromDNSNameString makes a native DNS-format domainname from a C string. -// The C string is in conventional DNS syntax: -// Textual labels, escaped as necessary using the usual DNS '\' notation, separated by dots. -// If successful, MakeDomainNameFromDNSNameString returns a pointer to the next unused byte -// in the domainname bufer (i.e. the next byte after the terminating zero). -// If unable to construct a legal domain name (i.e. label more than 63 bytes, or total more than 256 bytes) -// MakeDomainNameFromDNSNameString returns mDNSNULL. -mDNSexport mDNSu8 *MakeDomainNameFromDNSNameString(domainname *const name, const char *cstr) - { - name->c[0] = 0; // Make an empty domain name - return(AppendDNSNameString(name, cstr)); // And then add this string to it - } - -mDNSexport char *ConvertDomainLabelToCString_withescape(const domainlabel *const label, char *ptr, char esc) - { - const mDNSu8 * src = label->c; // Domain label we're reading - const mDNSu8 len = *src++; // Read length of this (non-null) label - const mDNSu8 *const end = src + len; // Work out where the label ends - if (len > MAX_DOMAIN_LABEL) return(mDNSNULL); // If illegal label, abort - while (src < end) // While we have characters in the label - { - mDNSu8 c = *src++; - if (esc) - { - if (c == '.' || c == esc) // If character is a dot or the escape character - *ptr++ = esc; // Output escape character - else if (c <= ' ') // If non-printing ascii, - { // Output decimal escape sequence - *ptr++ = esc; - *ptr++ = (char) ('0' + (c / 100) ); - *ptr++ = (char) ('0' + (c / 10) % 10); - c = (mDNSu8)('0' + (c ) % 10); - } - } - *ptr++ = (char)c; // Copy the character - } - *ptr = 0; // Null-terminate the string - return(ptr); // and return - } - -// Note: To guarantee that there will be no possible overrun, cstr must be at least MAX_ESCAPED_DOMAIN_NAME (1009 bytes) -mDNSexport char *ConvertDomainNameToCString_withescape(const domainname *const name, char *ptr, char esc) - { - const mDNSu8 *src = name->c; // Domain name we're reading - const mDNSu8 *const max = name->c + MAX_DOMAIN_NAME; // Maximum that's valid - - if (*src == 0) *ptr++ = '.'; // Special case: For root, just write a dot - - while (*src) // While more characters in the domain name - { - if (src + 1 + *src >= max) return(mDNSNULL); - ptr = ConvertDomainLabelToCString_withescape((const domainlabel *)src, ptr, esc); - if (!ptr) return(mDNSNULL); - src += 1 + *src; - *ptr++ = '.'; // Write the dot after the label - } - - *ptr++ = 0; // Null-terminate the string - return(ptr); // and return - } - -// RFC 1034 rules: -// Host names must start with a letter, end with a letter or digit, -// and have as interior characters only letters, digits, and hyphen. -// This was subsequently modified in RFC 1123 to allow the first character to be either a letter or a digit - -mDNSexport void ConvertUTF8PstringToRFC1034HostLabel(const mDNSu8 UTF8Name[], domainlabel *const hostlabel) - { - const mDNSu8 * src = &UTF8Name[1]; - const mDNSu8 *const end = &UTF8Name[1] + UTF8Name[0]; - mDNSu8 * ptr = &hostlabel->c[1]; - const mDNSu8 *const lim = &hostlabel->c[1] + MAX_DOMAIN_LABEL; - while (src < end) - { - // Delete apostrophes from source name - if (src[0] == '\'') { src++; continue; } // Standard straight single quote - if (src + 2 < end && src[0] == 0xE2 && src[1] == 0x80 && src[2] == 0x99) - { src += 3; continue; } // Unicode curly apostrophe - if (ptr < lim) - { - if (mDNSValidHostChar(*src, (ptr > &hostlabel->c[1]), (src < end-1))) *ptr++ = *src; - else if (ptr > &hostlabel->c[1] && ptr[-1] != '-') *ptr++ = '-'; - } - src++; - } - while (ptr > &hostlabel->c[1] && ptr[-1] == '-') ptr--; // Truncate trailing '-' marks - hostlabel->c[0] = (mDNSu8)(ptr - &hostlabel->c[1]); - } - -#define ValidTransportProtocol(X) ( (X)[0] == 4 && (X)[1] == '_' && \ - ((((X)[2] | 0x20) == 'u' && ((X)[3] | 0x20) == 'd') || (((X)[2] | 0x20) == 't' && ((X)[3] | 0x20) == 'c')) && \ - ((X)[4] | 0x20) == 'p') - -mDNSexport mDNSu8 *ConstructServiceName(domainname *const fqdn, - const domainlabel *name, const domainname *type, const domainname *const domain) - { - int i, len; - mDNSu8 *dst = fqdn->c; - const mDNSu8 *src; - const char *errormsg; -#if APPLE_OSX_mDNSResponder - mDNSBool loggedUnderscore = mDNSfalse; - static char typeBuf[MAX_ESCAPED_DOMAIN_NAME]; -#endif - - // In the case where there is no name (and ONLY in that case), - // a single-label subtype is allowed as the first label of a three-part "type" - if (!name && type) - { - const mDNSu8 *s0 = type->c; - if (s0[0] && s0[0] < 0x40) // If legal first label (at least one character, and no more than 63) - { - const mDNSu8 * s1 = s0 + 1 + s0[0]; - if (s1[0] && s1[0] < 0x40) // and legal second label (at least one character, and no more than 63) - { - const mDNSu8 *s2 = s1 + 1 + s1[0]; - if (s2[0] && s2[0] < 0x40 && s2[1+s2[0]] == 0) // and we have three and only three labels - { - static const mDNSu8 SubTypeLabel[5] = "\x04_sub"; - src = s0; // Copy the first label - len = *src; - for (i=0; i <= len; i++) *dst++ = *src++; - for (i=0; i < (int)sizeof(SubTypeLabel); i++) *dst++ = SubTypeLabel[i]; - type = (const domainname *)s1; - - // Special support to enable the DNSServiceBrowse call made by Bonjour Browser - // For these queries, we retract the "._sub" we just added between the subtype and the main type - // Remove after Bonjour Browser is updated to use DNSServiceQueryRecord instead of DNSServiceBrowse - if (SameDomainName((domainname*)s0, (const domainname*)"\x09_services\x07_dns-sd\x04_udp")) - dst -= sizeof(SubTypeLabel); - } - } - } - } - - if (name && name->c[0]) - { - src = name->c; // Put the service name into the domain name - len = *src; - if (len >= 0x40) { errormsg = "Service instance name too long"; goto fail; } - for (i=0; i<=len; i++) *dst++ = *src++; - } - else - name = (domainlabel*)""; // Set this up to be non-null, to avoid errors if we have to call LogMsg() below - - src = type->c; // Put the service type into the domain name - len = *src; - if (len < 2 || len > 16) - { - LogMsg("Bad service type in %#s.%##s%##s Application protocol name must be underscore plus 1-15 characters. " - "See ", name->c, type->c, domain->c); -#if APPLE_OSX_mDNSResponder - ConvertDomainNameToCString(type, typeBuf); - mDNSASLLog(mDNSNULL, "serviceType.nameTooLong", "noop", typeBuf, ""); -#endif - } - if (len < 2 || len >= 0x40 || (len > 16 && !SameDomainName(domain, &localdomain))) return(mDNSNULL); - if (src[1] != '_') { errormsg = "Application protocol name must begin with underscore"; goto fail; } - for (i=2; i<=len; i++) - { - // Letters and digits are allowed anywhere - if (mDNSIsLetter(src[i]) || mDNSIsDigit(src[i])) continue; - // Hyphens are only allowed as interior characters - // Underscores are not supposed to be allowed at all, but for backwards compatibility with some old products we do allow them, - // with the same rule as hyphens - if ((src[i] == '-' || src[i] == '_') && i > 2 && i < len) - { -#if APPLE_OSX_mDNSResponder - if (src[i] == '_' && loggedUnderscore == mDNSfalse) - { - ConvertDomainNameToCString(type, typeBuf); - mDNSASLLog(mDNSNULL, "serviceType.nameWithUnderscore", "noop", typeBuf, ""); - loggedUnderscore = mDNStrue; - } -#endif - continue; - } - errormsg = "Application protocol name must contain only letters, digits, and hyphens"; -#if APPLE_OSX_mDNSResponder - { - ConvertDomainNameToCString(type, typeBuf); - mDNSASLLog(mDNSNULL, "serviceType.nameWithIllegalCharacters", "noop", typeBuf, ""); - } -#endif - goto fail; - } - for (i=0; i<=len; i++) *dst++ = *src++; - - len = *src; - if (!ValidTransportProtocol(src)) { errormsg = "Transport protocol name must be _udp or _tcp"; goto fail; } - for (i=0; i<=len; i++) *dst++ = *src++; - - if (*src) { errormsg = "Service type must have only two labels"; goto fail; } - - *dst = 0; - if (!domain->c[0]) { errormsg = "Service domain must be non-empty"; goto fail; } - if (SameDomainName(domain, (const domainname*)"\x05" "local" "\x04" "arpa")) - { errormsg = "Illegal domain \"local.arpa.\" Use \"local.\" (or empty string)"; goto fail; } - dst = AppendDomainName(fqdn, domain); - if (!dst) { errormsg = "Service domain too long"; goto fail; } - return(dst); - -fail: - LogMsg("ConstructServiceName: %s: %#s.%##s%##s", errormsg, name->c, type->c, domain->c); - return(mDNSNULL); - } - -// A service name has the form: instance.application-protocol.transport-protocol.domain -// DeconstructServiceName is currently fairly forgiving: It doesn't try to enforce character -// set or length limits for the protocol names, and the final domain is allowed to be empty. -// However, if the given FQDN doesn't contain at least three labels, -// DeconstructServiceName will reject it and return mDNSfalse. -mDNSexport mDNSBool DeconstructServiceName(const domainname *const fqdn, - domainlabel *const name, domainname *const type, domainname *const domain) - { - int i, len; - const mDNSu8 *src = fqdn->c; - const mDNSu8 *max = fqdn->c + MAX_DOMAIN_NAME; - mDNSu8 *dst; - - dst = name->c; // Extract the service name - len = *src; - if (!len) { debugf("DeconstructServiceName: FQDN empty!"); return(mDNSfalse); } - if (len >= 0x40) { debugf("DeconstructServiceName: Instance name too long"); return(mDNSfalse); } - for (i=0; i<=len; i++) *dst++ = *src++; - - dst = type->c; // Extract the service type - len = *src; - if (!len) { debugf("DeconstructServiceName: FQDN contains only one label!"); return(mDNSfalse); } - if (len >= 0x40) { debugf("DeconstructServiceName: Application protocol name too long"); return(mDNSfalse); } - if (src[1] != '_'){ debugf("DeconstructServiceName: No _ at start of application protocol"); return(mDNSfalse); } - for (i=0; i<=len; i++) *dst++ = *src++; - - len = *src; - if (!len) { debugf("DeconstructServiceName: FQDN contains only two labels!"); return(mDNSfalse); } - if (!ValidTransportProtocol(src)) - { debugf("DeconstructServiceName: Transport protocol must be _udp or _tcp"); return(mDNSfalse); } - for (i=0; i<=len; i++) *dst++ = *src++; - *dst++ = 0; // Put terminator on the end of service type - - dst = domain->c; // Extract the service domain - while (*src) - { - len = *src; - if (len >= 0x40) - { debugf("DeconstructServiceName: Label in service domain too long"); return(mDNSfalse); } - if (src + 1 + len + 1 >= max) - { debugf("DeconstructServiceName: Total service domain too long"); return(mDNSfalse); } - for (i=0; i<=len; i++) *dst++ = *src++; - } - *dst++ = 0; // Put the null root label on the end - - return(mDNStrue); - } - -// Notes on UTF-8: -// 0xxxxxxx represents a 7-bit ASCII value from 0x00 to 0x7F -// 10xxxxxx is a continuation byte of a multi-byte character -// 110xxxxx is the first byte of a 2-byte character (11 effective bits; values 0x 80 - 0x 800-1) -// 1110xxxx is the first byte of a 3-byte character (16 effective bits; values 0x 800 - 0x 10000-1) -// 11110xxx is the first byte of a 4-byte character (21 effective bits; values 0x 10000 - 0x 200000-1) -// 111110xx is the first byte of a 5-byte character (26 effective bits; values 0x 200000 - 0x 4000000-1) -// 1111110x is the first byte of a 6-byte character (31 effective bits; values 0x4000000 - 0x80000000-1) -// -// UTF-16 surrogate pairs are used in UTF-16 to encode values larger than 0xFFFF. -// Although UTF-16 surrogate pairs are not supposed to appear in legal UTF-8, we want to be defensive -// about that too. (See , "What are surrogates?") -// The first of pair is a UTF-16 value in the range 0xD800-0xDBFF (11101101 1010xxxx 10xxxxxx in UTF-8), -// and the second is a UTF-16 value in the range 0xDC00-0xDFFF (11101101 1011xxxx 10xxxxxx in UTF-8). - -mDNSexport mDNSu32 TruncateUTF8ToLength(mDNSu8 *string, mDNSu32 length, mDNSu32 max) - { - if (length > max) - { - mDNSu8 c1 = string[max]; // First byte after cut point - mDNSu8 c2 = (max+1 < length) ? string[max+1] : (mDNSu8)0xB0; // Second byte after cut point - length = max; // Trim length down - while (length > 0) - { - // Check if the byte right after the chop point is a UTF-8 continuation byte, - // or if the character right after the chop point is the second of a UTF-16 surrogate pair. - // If so, then we continue to chop more bytes until we get to a legal chop point. - mDNSBool continuation = ((c1 & 0xC0) == 0x80); - mDNSBool secondsurrogate = (c1 == 0xED && (c2 & 0xF0) == 0xB0); - if (!continuation && !secondsurrogate) break; - c2 = c1; - c1 = string[--length]; - } - // Having truncated characters off the end of our string, also cut off any residual white space - while (length > 0 && string[length-1] <= ' ') length--; - } - return(length); - } - -// Returns true if a rich text label ends in " (nnn)", or if an RFC 1034 -// name ends in "-nnn", where n is some decimal number. -mDNSexport mDNSBool LabelContainsSuffix(const domainlabel *const name, const mDNSBool RichText) - { - mDNSu16 l = name->c[0]; - - if (RichText) - { - if (l < 4) return mDNSfalse; // Need at least " (2)" - if (name->c[l--] != ')') return mDNSfalse; // Last char must be ')' - if (!mDNSIsDigit(name->c[l])) return mDNSfalse; // Preceeded by a digit - l--; - while (l > 2 && mDNSIsDigit(name->c[l])) l--; // Strip off digits - return (name->c[l] == '(' && name->c[l - 1] == ' '); - } - else - { - if (l < 2) return mDNSfalse; // Need at least "-2" - if (!mDNSIsDigit(name->c[l])) return mDNSfalse; // Last char must be a digit - l--; - while (l > 2 && mDNSIsDigit(name->c[l])) l--; // Strip off digits - return (name->c[l] == '-'); - } - } - -// removes an auto-generated suffix (appended on a name collision) from a label. caller is -// responsible for ensuring that the label does indeed contain a suffix. returns the number -// from the suffix that was removed. -mDNSexport mDNSu32 RemoveLabelSuffix(domainlabel *name, mDNSBool RichText) - { - mDNSu32 val = 0, multiplier = 1; - - // Chop closing parentheses from RichText suffix - if (RichText && name->c[0] >= 1 && name->c[name->c[0]] == ')') name->c[0]--; - - // Get any existing numerical suffix off the name - while (mDNSIsDigit(name->c[name->c[0]])) - { val += (name->c[name->c[0]] - '0') * multiplier; multiplier *= 10; name->c[0]--; } - - // Chop opening parentheses or dash from suffix - if (RichText) - { - if (name->c[0] >= 2 && name->c[name->c[0]] == '(' && name->c[name->c[0]-1] == ' ') name->c[0] -= 2; - } - else - { - if (name->c[0] >= 1 && name->c[name->c[0]] == '-') name->c[0] -= 1; - } - - return(val); - } - -// appends a numerical suffix to a label, with the number following a whitespace and enclosed -// in parentheses (rich text) or following two consecutive hyphens (RFC 1034 domain label). -mDNSexport void AppendLabelSuffix(domainlabel *const name, mDNSu32 val, const mDNSBool RichText) - { - mDNSu32 divisor = 1, chars = 2; // Shortest possible RFC1034 name suffix is 2 characters ("-2") - if (RichText) chars = 4; // Shortest possible RichText suffix is 4 characters (" (2)") - - // Truncate trailing spaces from RichText names - if (RichText) while (name->c[name->c[0]] == ' ') name->c[0]--; - - while (divisor < 0xFFFFFFFFUL/10 && val >= divisor * 10) { divisor *= 10; chars++; } - - name->c[0] = (mDNSu8) TruncateUTF8ToLength(name->c+1, name->c[0], MAX_DOMAIN_LABEL - chars); - - if (RichText) { name->c[++name->c[0]] = ' '; name->c[++name->c[0]] = '('; } - else { name->c[++name->c[0]] = '-'; } - - while (divisor) - { - name->c[++name->c[0]] = (mDNSu8)('0' + val / divisor); - val %= divisor; - divisor /= 10; - } - - if (RichText) name->c[++name->c[0]] = ')'; - } - -mDNSexport void IncrementLabelSuffix(domainlabel *name, mDNSBool RichText) - { - mDNSu32 val = 0; - - if (LabelContainsSuffix(name, RichText)) - val = RemoveLabelSuffix(name, RichText); - - // If no existing suffix, start by renaming "Foo" as "Foo (2)" or "Foo-2" as appropriate. - // If existing suffix in the range 2-9, increment it. - // If we've had ten conflicts already, there are probably too many hosts trying to use the same name, - // so add a random increment to improve the chances of finding an available name next time. - if (val == 0) val = 2; - else if (val < 10) val++; - else val += 1 + mDNSRandom(99); - - AppendLabelSuffix(name, val, RichText); - } - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - Resource Record Utility Functions -#endif - -// Set up a AuthRecord with sensible default values. -// These defaults may be overwritten with new values before mDNS_Register is called -mDNSexport void mDNS_SetupResourceRecord(AuthRecord *rr, RData *RDataStorage, mDNSInterfaceID InterfaceID, - mDNSu16 rrtype, mDNSu32 ttl, mDNSu8 RecordType, AuthRecType artype, mDNSRecordCallback Callback, void *Context) - { - // - // LocalOnly auth record can be created with LocalOnly InterfaceID or a valid InterfaceID. - // Most of the applications normally create with LocalOnly InterfaceID and we store them as - // such, so that we can deliver the response to questions that specify LocalOnly InterfaceID. - // LocalOnly resource records can also be created with valid InterfaceID which happens today - // when we create LocalOnly records for /etc/hosts. - - if (InterfaceID == mDNSInterface_LocalOnly && artype != AuthRecordLocalOnly) - { - LogMsg("mDNS_SetupResourceRecord: ERROR!! Mismatch LocalOnly record InterfaceID %p called with artype %d", InterfaceID, artype); - return; - } - else if (InterfaceID == mDNSInterface_P2P && artype != AuthRecordP2P) - { - LogMsg("mDNS_SetupResourceRecord: ERROR!! Mismatch P2P record InterfaceID %p called with artype %d", InterfaceID, artype); - return; - } - else if (!InterfaceID && (artype == AuthRecordP2P || artype == AuthRecordLocalOnly)) - { - LogMsg("mDNS_SetupResourceRecord: ERROR!! Mismatch InterfaceAny record InterfaceID %p called with artype %d", InterfaceID, artype); - return; - } - - // Don't try to store a TTL bigger than we can represent in platform time units - if (ttl > 0x7FFFFFFFUL / mDNSPlatformOneSecond) - ttl = 0x7FFFFFFFUL / mDNSPlatformOneSecond; - else if (ttl == 0) // And Zero TTL is illegal - ttl = DefaultTTLforRRType(rrtype); - - // Field Group 1: The actual information pertaining to this resource record - rr->resrec.RecordType = RecordType; - rr->resrec.InterfaceID = InterfaceID; - rr->resrec.name = &rr->namestorage; - rr->resrec.rrtype = rrtype; - rr->resrec.rrclass = kDNSClass_IN; - rr->resrec.rroriginalttl = ttl; - rr->resrec.rDNSServer = mDNSNULL; -// rr->resrec.rdlength = MUST set by client and/or in mDNS_Register_internal -// rr->resrec.rdestimate = set in mDNS_Register_internal -// rr->resrec.rdata = MUST be set by client - - if (RDataStorage) - rr->resrec.rdata = RDataStorage; - else - { - rr->resrec.rdata = &rr->rdatastorage; - rr->resrec.rdata->MaxRDLength = sizeof(RDataBody); - } - - // Field Group 2: Persistent metadata for Authoritative Records - rr->Additional1 = mDNSNULL; - rr->Additional2 = mDNSNULL; - rr->DependentOn = mDNSNULL; - rr->RRSet = mDNSNULL; - rr->RecordCallback = Callback; - rr->RecordContext = Context; - - rr->AutoTarget = Target_Manual; - rr->AllowRemoteQuery = mDNSfalse; - rr->ForceMCast = mDNSfalse; - - rr->WakeUp = zeroOwner; - rr->AddressProxy = zeroAddr; - rr->TimeRcvd = 0; - rr->TimeExpire = 0; - rr->ARType = artype; - - // Field Group 3: Transient state for Authoritative Records (set in mDNS_Register_internal) - // Field Group 4: Transient uDNS state for Authoritative Records (set in mDNS_Register_internal) - - // For now, until the uDNS code is fully integrated, it's helpful to zero the uDNS state fields here too, just in case - // (e.g. uDNS_RegisterService short-circuits the usual mDNS_Register_internal record registration calls, so a bunch - // of fields don't get set up properly. In particular, if we don't zero rr->QueuedRData then the uDNS code crashes.) - rr->state = regState_Zero; - rr->uselease = 0; - rr->expire = 0; - rr->Private = 0; - rr->updateid = zeroID; - rr->zone = rr->resrec.name; - rr->nta = mDNSNULL; - rr->tcp = mDNSNULL; - rr->OrigRData = 0; - rr->OrigRDLen = 0; - rr->InFlightRData = 0; - rr->InFlightRDLen = 0; - rr->QueuedRData = 0; - rr->QueuedRDLen = 0; - mDNSPlatformMemZero(&rr->NATinfo, sizeof(rr->NATinfo)); - rr->SRVChanged = mDNSfalse; - rr->mState = mergeState_Zero; - - rr->namestorage.c[0] = 0; // MUST be set by client before calling mDNS_Register() - } - -mDNSexport void mDNS_SetupQuestion(DNSQuestion *const q, const mDNSInterfaceID InterfaceID, const domainname *const name, - const mDNSu16 qtype, mDNSQuestionCallback *const callback, void *const context) - { - q->InterfaceID = InterfaceID; - q->Target = zeroAddr; - AssignDomainName(&q->qname, name); - q->qtype = qtype; - q->qclass = kDNSClass_IN; - q->LongLived = (qtype == kDNSType_PTR); - q->ExpectUnique = (qtype != kDNSType_PTR); - q->ForceMCast = mDNSfalse; - q->ReturnIntermed = mDNSfalse; - q->SuppressUnusable = mDNSfalse; - q->SearchListIndex = 0; - q->AppendSearchDomains = 0; - q->RetryWithSearchDomains = mDNSfalse; - q->TimeoutQuestion = 0; - q->WakeOnResolve = 0; - q->qnameOrig = mDNSNULL; - q->QuestionCallback = callback; - q->QuestionContext = context; - } - -mDNSexport mDNSu32 RDataHashValue(const ResourceRecord *const rr) - { - int len = rr->rdlength; - const RDataBody2 *const rdb = (RDataBody2 *)rr->rdata->u.data; - switch(rr->rrtype) - { - case kDNSType_NS: - case kDNSType_CNAME: - case kDNSType_PTR: - case kDNSType_DNAME: return DomainNameHashValue(&rdb->name); - - case kDNSType_SOA: return rdb->soa.serial + - rdb->soa.refresh + - rdb->soa.retry + - rdb->soa.expire + - rdb->soa.min + - DomainNameHashValue(&rdb->soa.mname) + - DomainNameHashValue(&rdb->soa.rname); - - case kDNSType_MX: - case kDNSType_AFSDB: - case kDNSType_RT: - case kDNSType_KX: return DomainNameHashValue(&rdb->mx.exchange); - - case kDNSType_RP: return DomainNameHashValue(&rdb->rp.mbox) + DomainNameHashValue(&rdb->rp.txt); - - case kDNSType_PX: return DomainNameHashValue(&rdb->px.map822) + DomainNameHashValue(&rdb->px.mapx400); - - case kDNSType_SRV: return DomainNameHashValue(&rdb->srv.target); - - case kDNSType_OPT: return 0; // OPT is a pseudo-RR container structure; makes no sense to compare - - case kDNSType_NSEC: len = sizeof(rdataNSEC); // Use in-memory length of 32, and fall through default checksum computation below - - default: - { - mDNSu32 sum = 0; - int i; - for (i=0; i+1 < len; i+=2) - { - sum += (((mDNSu32)(rdb->data[i])) << 8) | rdb->data[i+1]; - sum = (sum<<3) | (sum>>29); - } - if (i < len) - { - sum += ((mDNSu32)(rdb->data[i])) << 8; - } - return(sum); - } - } - } - -// r1 has to be a full ResourceRecord including rrtype and rdlength -// r2 is just a bare RDataBody, which MUST be the same rrtype and rdlength as r1 -mDNSexport mDNSBool SameRDataBody(const ResourceRecord *const r1, const RDataBody *const r2, DomainNameComparisonFn *samename) - { - const RDataBody2 *const b1 = (RDataBody2 *)r1->rdata->u.data; - const RDataBody2 *const b2 = (RDataBody2 *)r2; - switch(r1->rrtype) - { - case kDNSType_NS: - case kDNSType_CNAME: - case kDNSType_PTR: - case kDNSType_DNAME:return(SameDomainName(&b1->name, &b2->name)); - - case kDNSType_SOA: return(mDNSBool)( b1->soa.serial == b2->soa.serial && - b1->soa.refresh == b2->soa.refresh && - b1->soa.retry == b2->soa.retry && - b1->soa.expire == b2->soa.expire && - b1->soa.min == b2->soa.min && - samename(&b1->soa.mname, &b2->soa.mname) && - samename(&b1->soa.rname, &b2->soa.rname)); - - case kDNSType_MX: - case kDNSType_AFSDB: - case kDNSType_RT: - case kDNSType_KX: return(mDNSBool)( b1->mx.preference == b2->mx.preference && - samename(&b1->mx.exchange, &b2->mx.exchange)); - - case kDNSType_RP: return(mDNSBool)( samename(&b1->rp.mbox, &b2->rp.mbox) && - samename(&b1->rp.txt, &b2->rp.txt)); - - case kDNSType_PX: return(mDNSBool)( b1->px.preference == b2->px.preference && - samename(&b1->px.map822, &b2->px.map822) && - samename(&b1->px.mapx400, &b2->px.mapx400)); - - case kDNSType_SRV: return(mDNSBool)( b1->srv.priority == b2->srv.priority && - b1->srv.weight == b2->srv.weight && - mDNSSameIPPort(b1->srv.port, b2->srv.port) && - samename(&b1->srv.target, &b2->srv.target)); - - case kDNSType_OPT: return mDNSfalse; // OPT is a pseudo-RR container structure; makes no sense to compare - - case kDNSType_NSEC: return(mDNSPlatformMemSame(b1->data, b2->data, sizeof(rdataNSEC))); - - default: return(mDNSPlatformMemSame(b1->data, b2->data, r1->rdlength)); - } - } - -// ResourceRecordAnswersQuestion returns mDNStrue if the given resource record is a valid answer to the given question. -// SameNameRecordAnswersQuestion is the same, except it skips the expensive SameDomainName() call. -// SameDomainName() is generally cheap when the names don't match, but expensive when they do match, -// because it has to check all the way to the end of the names to be sure. -// In cases where we know in advance that the names match it's especially advantageous to skip the -// SameDomainName() call because that's precisely the time when it's most expensive and least useful. - -mDNSexport mDNSBool SameNameRecordAnswersQuestion(const ResourceRecord *const rr, const DNSQuestion *const q) - { - // LocalOnly/P2P questions can be answered with AuthRecordAny in this function. LocalOnly/P2P records - // are handled in LocalOnlyRecordAnswersQuestion - if ((rr->InterfaceID == mDNSInterface_LocalOnly) || (rr->InterfaceID == mDNSInterface_P2P)) - { - LogMsg("SameNameRecordAnswersQuestion: ERROR!! called with LocalOnly ResourceRecord %p, Question %p", rr->InterfaceID, q->InterfaceID); - return mDNSfalse; - } - if (rr->InterfaceID && - q ->InterfaceID && q->InterfaceID != mDNSInterface_LocalOnly && - rr->InterfaceID != q->InterfaceID) return(mDNSfalse); - - // Resource record received via unicast, the DNSServer entries should match ? - if (!rr->InterfaceID && rr->rDNSServer != q->qDNSServer) return(mDNSfalse); - - // If ResourceRecord received via multicast, but question was unicast, then shouldn't use record to answer this question - if (rr->InterfaceID && !mDNSOpaque16IsZero(q->TargetQID)) return(mDNSfalse); - - // RR type CNAME matches any query type. QTYPE ANY matches any RR type. QCLASS ANY matches any RR class. - if (!RRTypeAnswersQuestionType(rr,q->qtype)) return(mDNSfalse); - if (rr->rrclass != q->qclass && q->qclass != kDNSQClass_ANY) return(mDNSfalse); - - return(mDNStrue); - } - -mDNSexport mDNSBool ResourceRecordAnswersQuestion(const ResourceRecord *const rr, const DNSQuestion *const q) - { - // LocalOnly/P2P questions can be answered with AuthRecordAny in this function. LocalOnly/P2P records - // are handled in LocalOnlyRecordAnswersQuestion - if ((rr->InterfaceID == mDNSInterface_LocalOnly) || (rr->InterfaceID == mDNSInterface_P2P)) - { - LogMsg("ResourceRecordAnswersQuestion: ERROR!! called with LocalOnly/P2P ResourceRecord %p, Question %p", rr->InterfaceID, q->InterfaceID); - return mDNSfalse; - } - - if (rr->InterfaceID && - q ->InterfaceID && q->InterfaceID != mDNSInterface_LocalOnly && - rr->InterfaceID != q->InterfaceID) return(mDNSfalse); - - // Resource record received via unicast, the DNSServer entries should match ? - if (!rr->InterfaceID && rr->rDNSServer != q->qDNSServer) return(mDNSfalse); - - // If ResourceRecord received via multicast, but question was unicast, then shouldn't use record to answer this question. - if (rr->InterfaceID && !mDNSOpaque16IsZero(q->TargetQID)) return(mDNSfalse); - - // RR type CNAME matches any query type. QTYPE ANY matches any RR type. QCLASS ANY matches any RR class. - if (!RRTypeAnswersQuestionType(rr,q->qtype)) return(mDNSfalse); - if (rr->rrclass != q->qclass && q->qclass != kDNSQClass_ANY) return(mDNSfalse); - - return(rr->namehash == q->qnamehash && SameDomainName(rr->name, &q->qname)); - } - -// We have a separate function to handle LocalOnly AuthRecords because they can be created with -// a valid InterfaceID (e.g., scoped /etc/hosts) and can be used to answer unicast questions unlike -// multicast resource records (which has a valid InterfaceID) which can't be used to answer -// unicast questions. ResourceRecordAnswersQuestion/SameNameRecordAnswersQuestion can't tell whether -// a resource record is multicast or LocalOnly by just looking at the ResourceRecord because -// LocalOnly records are truly identified by ARType in the AuthRecord. As P2P and LocalOnly record -// are kept in the same hash table, we use the same function to make it easy for the callers when -// they walk the hash table to answer LocalOnly/P2P questions -// -mDNSexport mDNSBool LocalOnlyRecordAnswersQuestion(AuthRecord *const ar, const DNSQuestion *const q) - { - ResourceRecord *rr = &ar->resrec; - - // mDNSInterface_Any questions can be answered with LocalOnly/P2P records in this function. AuthRecord_Any - // records are handled in ResourceRecordAnswersQuestion/SameNameRecordAnswersQuestion - if (RRAny(ar)) - { - LogMsg("LocalOnlyRecordAnswersQuestion: ERROR!! called with regular AuthRecordAny %##s", rr->name->c); - return mDNSfalse; - } - - // Questions with mDNSInterface_LocalOnly InterfaceID should be answered with all resource records that are - // *local* to the machine. These include resource records that have InterfaceID set to mDNSInterface_LocalOnly, - // mDNSInterface_Any and any other real InterfaceID. Hence, LocalOnly questions should not be checked against - // the InterfaceID in the resource record. - // - // mDNSInterface_Unicast does not indicate any scope and hence treat them like mDNSInterface_Any. - - if (rr->InterfaceID && - q->InterfaceID && q->InterfaceID != mDNSInterface_LocalOnly && q->InterfaceID != mDNSInterface_Unicast && - rr->InterfaceID != q->InterfaceID) return(mDNSfalse); - - // Entries in /etc/hosts are added as LocalOnly resource records. The LocalOnly resource records - // may have a scope e.g., fe80::1%en0. The question may be scoped or not: the InterfaceID may be set - // to mDNSInterface_Any, mDNSInterface_LocalOnly or a real InterfaceID (scoped). - // - // 1) Question: Any, LocalOnly Record: no scope. This question should be answered with this record. - // - // 2) Question: Any, LocalOnly Record: scoped. This question should be answered with the record because - // traditionally applications never specify scope e.g., getaddrinfo, but need to be able - // to get to /etc/hosts entries. - // - // 3) Question: Scoped (LocalOnly or InterfaceID), LocalOnly Record: no scope. This is the inverse of (2). - // If we register a LocalOnly record, we need to answer a LocalOnly question. If the /etc/hosts has a - // non scoped entry, it may not make sense to answer a scoped question. But we can't tell these two - // cases apart. As we currently answer LocalOnly question with LocalOnly record, we continue to do so. - // - // 4) Question: Scoped (LocalOnly or InterfaceID), LocalOnly Record: scoped. LocalOnly questions should be - // answered with any resource record where as if it has a valid InterfaceID, the scope should match. - // - // (1) and (2) is bypassed because we check for a non-NULL InterfaceID above. For (3), the InterfaceID is NULL - // and hence bypassed above. For (4) we bypassed LocalOnly questions and checked the scope of the record - // against the question. - // - // For P2P, InterfaceIDs of the question and the record should match. - - // If ResourceRecord received via multicast, but question was unicast, then shouldn't use record to answer this question. - // LocalOnly authoritative answers are exempt. LocalOnly authoritative answers are used for /etc/host entries. - // We don't want a local process to be able to create a fake LocalOnly address record for "www.bigbank.com" which would then - // cause other applications (e.g. Safari) to connect to the wrong address. The rpc to register records filters out records - // with names that don't end in local and have mDNSInterface_LocalOnly set. - // - // Note: The check is bypassed for LocalOnly and for P2P it is not needed as only .local records are registered and for - // a question to match its names, it also has to end in .local and that question can't be a unicast question (See - // Question_uDNS macro and its usage). As P2P does not enforce .local only registrations we still make this check - // and also makes it future proof. - - if (ar->ARType != AuthRecordLocalOnly && rr->InterfaceID && !mDNSOpaque16IsZero(q->TargetQID)) return(mDNSfalse); - - // RR type CNAME matches any query type. QTYPE ANY matches any RR type. QCLASS ANY matches any RR class. - if (!RRTypeAnswersQuestionType(rr,q->qtype)) return(mDNSfalse); - if (rr->rrclass != q->qclass && q->qclass != kDNSQClass_ANY) return(mDNSfalse); - - return(rr->namehash == q->qnamehash && SameDomainName(rr->name, &q->qname)); - } - -mDNSexport mDNSBool AnyTypeRecordAnswersQuestion(const ResourceRecord *const rr, const DNSQuestion *const q) - { - // LocalOnly/P2P questions can be answered with AuthRecordAny in this function. LocalOnly/P2P records - // are handled in LocalOnlyRecordAnswersQuestion - if ((rr->InterfaceID == mDNSInterface_LocalOnly) || (rr->InterfaceID == mDNSInterface_P2P)) - { - LogMsg("AnyTypeRecordAnswersQuestion: ERROR!! called with LocalOnly ResourceRecord %p, Question %p", rr->InterfaceID, q->InterfaceID); - return mDNSfalse; - } - if (rr->InterfaceID && - q ->InterfaceID && q->InterfaceID != mDNSInterface_LocalOnly && - rr->InterfaceID != q->InterfaceID) return(mDNSfalse); - - // Resource record received via unicast, the DNSServer entries should match ? - // Note that Auth Records are normally setup with NULL InterfaceID and - // both the DNSServers are assumed to be NULL in that case - if (!rr->InterfaceID && rr->rDNSServer != q->qDNSServer) return(mDNSfalse); - - // If ResourceRecord received via multicast, but question was unicast, then shouldn't use record to answer this question - if (rr->InterfaceID && !mDNSOpaque16IsZero(q->TargetQID)) return(mDNSfalse); - - if (rr->rrclass != q->qclass && q->qclass != kDNSQClass_ANY) return(mDNSfalse); - - return(rr->namehash == q->qnamehash && SameDomainName(rr->name, &q->qname)); - } - -// This is called with both unicast resource record and multicast resource record. The question that -// received the unicast response could be the regular unicast response from a DNS server or a response -// to a mDNS QU query. The main reason we need this function is that we can't compare DNSServers between the -// question and the resource record because the resource record is not completely initialized in -// mDNSCoreReceiveResponse when this function is called. -mDNSexport mDNSBool ResourceRecordAnswersUnicastResponse(const ResourceRecord *const rr, const DNSQuestion *const q) - { - // For resource records created using multicast, the InterfaceIDs have to match - if (rr->InterfaceID && - q->InterfaceID && rr->InterfaceID != q->InterfaceID) return(mDNSfalse); - - // If ResourceRecord received via multicast, but question was unicast, then shouldn't use record to answer this question. - if (rr->InterfaceID && !mDNSOpaque16IsZero(q->TargetQID)) return(mDNSfalse); - - // RR type CNAME matches any query type. QTYPE ANY matches any RR type. QCLASS ANY matches any RR class. - if (!RRTypeAnswersQuestionType(rr,q->qtype)) return(mDNSfalse); - - if (rr->rrclass != q->qclass && q->qclass != kDNSQClass_ANY) return(mDNSfalse); - - return(rr->namehash == q->qnamehash && SameDomainName(rr->name, &q->qname)); - } - -mDNSexport mDNSu16 GetRDLength(const ResourceRecord *const rr, mDNSBool estimate) - { - const RDataBody2 *const rd = (RDataBody2 *)rr->rdata->u.data; - const domainname *const name = estimate ? rr->name : mDNSNULL; - if (rr->rrclass == kDNSQClass_ANY) return(rr->rdlength); // Used in update packets to mean "Delete An RRset" (RFC 2136) - else switch (rr->rrtype) - { - case kDNSType_A: return(sizeof(rd->ipv4)); - - case kDNSType_NS: - case kDNSType_CNAME: - case kDNSType_PTR: - case kDNSType_DNAME:return(CompressedDomainNameLength(&rd->name, name)); - - case kDNSType_SOA: return(mDNSu16)(CompressedDomainNameLength(&rd->soa.mname, name) + - CompressedDomainNameLength(&rd->soa.rname, name) + - 5 * sizeof(mDNSOpaque32)); - - case kDNSType_NULL: - case kDNSType_TSIG: - case kDNSType_TXT: - case kDNSType_X25: - case kDNSType_ISDN: - case kDNSType_LOC: - case kDNSType_DHCID:return(rr->rdlength); // Not self-describing, so have to just trust rdlength - - case kDNSType_HINFO:return(mDNSu16)(2 + (int)rd->data[0] + (int)rd->data[1 + (int)rd->data[0]]); - - case kDNSType_MX: - case kDNSType_AFSDB: - case kDNSType_RT: - case kDNSType_KX: return(mDNSu16)(2 + CompressedDomainNameLength(&rd->mx.exchange, name)); - - case kDNSType_RP: return(mDNSu16)(CompressedDomainNameLength(&rd->rp.mbox, name) + - CompressedDomainNameLength(&rd->rp.txt, name)); - - case kDNSType_PX: return(mDNSu16)(2 + CompressedDomainNameLength(&rd->px.map822, name) + - CompressedDomainNameLength(&rd->px.mapx400, name)); - - case kDNSType_AAAA: return(sizeof(rd->ipv6)); - - case kDNSType_SRV: return(mDNSu16)(6 + CompressedDomainNameLength(&rd->srv.target, name)); - - case kDNSType_OPT: return(rr->rdlength); - - case kDNSType_NSEC: { - int i; - for (i=sizeof(rdataNSEC); i>0; i--) if (rd->nsec.bitmap[i-1]) break; - // For our simplified use of NSEC synthetic records: - // nextname is always the record's own name, - // and if we have at least one record type that exists, - // - the block number is always 0, - // - the count byte is a value in the range 1-32, - // - followed by the 1-32 data bytes - return(mDNSu16)((estimate ? 2 : DomainNameLength(rr->name)) + (i ? (2 + i) : 0)); - } - - default: debugf("Warning! Don't know how to get length of resource type %d", rr->rrtype); - return(rr->rdlength); - } - } - -// When a local client registers (or updates) a record, we use this routine to do some simple validation checks -// to help reduce the risk of bogus malformed data on the network -mDNSexport mDNSBool ValidateRData(const mDNSu16 rrtype, const mDNSu16 rdlength, const RData *const rd) - { - mDNSu16 len; - - switch(rrtype) - { - case kDNSType_A: return(rdlength == sizeof(mDNSv4Addr)); - - case kDNSType_NS: // Same as PTR - case kDNSType_MD: // Same as PTR - case kDNSType_MF: // Same as PTR - case kDNSType_CNAME:// Same as PTR - //case kDNSType_SOA not checked - case kDNSType_MB: // Same as PTR - case kDNSType_MG: // Same as PTR - case kDNSType_MR: // Same as PTR - //case kDNSType_NULL not checked (no specified format, so always valid) - //case kDNSType_WKS not checked - case kDNSType_PTR: len = DomainNameLengthLimit(&rd->u.name, rd->u.data + rdlength); - return(len <= MAX_DOMAIN_NAME && rdlength == len); - - case kDNSType_HINFO:// Same as TXT (roughly) - case kDNSType_MINFO:// Same as TXT (roughly) - case kDNSType_TXT: if (!rdlength) return(mDNSfalse); // TXT record has to be at least one byte (RFC 1035) - { - const mDNSu8 *ptr = rd->u.txt.c; - const mDNSu8 *end = rd->u.txt.c + rdlength; - while (ptr < end) ptr += 1 + ptr[0]; - return (ptr == end); - } - - case kDNSType_AAAA: return(rdlength == sizeof(mDNSv6Addr)); - - case kDNSType_MX: // Must be at least two-byte preference, plus domainname - // Call to DomainNameLengthLimit() implicitly enforces both requirements for us - len = DomainNameLengthLimit(&rd->u.mx.exchange, rd->u.data + rdlength); - return(len <= MAX_DOMAIN_NAME && rdlength == 2+len); - - case kDNSType_SRV: // Must be at least priority+weight+port, plus domainname - // Call to DomainNameLengthLimit() implicitly enforces both requirements for us - len = DomainNameLengthLimit(&rd->u.srv.target, rd->u.data + rdlength); - return(len <= MAX_DOMAIN_NAME && rdlength == 6+len); - - //case kDNSType_NSEC not checked - - default: return(mDNStrue); // Allow all other types without checking - } - } - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - DNS Message Creation Functions -#endif - -mDNSexport void InitializeDNSMessage(DNSMessageHeader *h, mDNSOpaque16 id, mDNSOpaque16 flags) - { - h->id = id; - h->flags = flags; - h->numQuestions = 0; - h->numAnswers = 0; - h->numAuthorities = 0; - h->numAdditionals = 0; - } - -mDNSexport const mDNSu8 *FindCompressionPointer(const mDNSu8 *const base, const mDNSu8 *const end, const mDNSu8 *const domname) - { - const mDNSu8 *result = end - *domname - 1; - - if (*domname == 0) return(mDNSNULL); // There's no point trying to match just the root label - - // This loop examines each possible starting position in packet, starting end of the packet and working backwards - while (result >= base) - { - // If the length byte and first character of the label match, then check further to see - // if this location in the packet will yield a useful name compression pointer. - if (result[0] == domname[0] && result[1] == domname[1]) - { - const mDNSu8 *name = domname; - const mDNSu8 *targ = result; - while (targ + *name < end) - { - // First see if this label matches - int i; - const mDNSu8 *pointertarget; - for (i=0; i <= *name; i++) if (targ[i] != name[i]) break; - if (i <= *name) break; // If label did not match, bail out - targ += 1 + *name; // Else, did match, so advance target pointer - name += 1 + *name; // and proceed to check next label - if (*name == 0 && *targ == 0) return(result); // If no more labels, we found a match! - if (*name == 0) break; // If no more labels to match, we failed, so bail out - - // The label matched, so now follow the pointer (if appropriate) and then see if the next label matches - if (targ[0] < 0x40) continue; // If length value, continue to check next label - if (targ[0] < 0xC0) break; // If 40-BF, not valid - if (targ+1 >= end) break; // Second byte not present! - pointertarget = base + (((mDNSu16)(targ[0] & 0x3F)) << 8) + targ[1]; - if (targ < pointertarget) break; // Pointertarget must point *backwards* in the packet - if (pointertarget[0] >= 0x40) break; // Pointertarget must point to a valid length byte - targ = pointertarget; - } - } - result--; // We failed to match at this search position, so back up the tentative result pointer and try again - } - return(mDNSNULL); - } - -// Put a string of dot-separated labels as length-prefixed labels -// domainname is a fully-qualified name (i.e. assumed to be ending in a dot, even if it doesn't) -// msg points to the message we're building (pass mDNSNULL if we don't want to use compression pointers) -// end points to the end of the message so far -// ptr points to where we want to put the name -// limit points to one byte past the end of the buffer that we must not overrun -// domainname is the name to put -mDNSexport mDNSu8 *putDomainNameAsLabels(const DNSMessage *const msg, - mDNSu8 *ptr, const mDNSu8 *const limit, const domainname *const name) - { - const mDNSu8 *const base = (const mDNSu8 *)msg; - const mDNSu8 * np = name->c; - const mDNSu8 *const max = name->c + MAX_DOMAIN_NAME; // Maximum that's valid - const mDNSu8 * pointer = mDNSNULL; - const mDNSu8 *const searchlimit = ptr; - - if (!ptr) { LogMsg("putDomainNameAsLabels %##s ptr is null", name->c); return(mDNSNULL); } - - if (!*np) // If just writing one-byte root label, make sure we have space for that - { - if (ptr >= limit) return(mDNSNULL); - } - else // else, loop through writing labels and/or a compression offset - { - do { - if (*np > MAX_DOMAIN_LABEL) - { LogMsg("Malformed domain name %##s (label more than 63 bytes)", name->c); return(mDNSNULL); } - - // This check correctly allows for the final trailing root label: - // e.g. - // Suppose our domain name is exactly 256 bytes long, including the final trailing root label. - // Suppose np is now at name->c[249], and we're about to write our last non-null label ("local"). - // We know that max will be at name->c[256] - // That means that np + 1 + 5 == max - 1, so we (just) pass the "if" test below, write our - // six bytes, then exit the loop, write the final terminating root label, and the domain - // name we've written is exactly 256 bytes long, exactly at the correct legal limit. - // If the name is one byte longer, then we fail the "if" test below, and correctly bail out. - if (np + 1 + *np >= max) - { LogMsg("Malformed domain name %##s (more than 256 bytes)", name->c); return(mDNSNULL); } - - if (base) pointer = FindCompressionPointer(base, searchlimit, np); - if (pointer) // Use a compression pointer if we can - { - const mDNSu16 offset = (mDNSu16)(pointer - base); - if (ptr+2 > limit) return(mDNSNULL); // If we don't have two bytes of space left, give up - *ptr++ = (mDNSu8)(0xC0 | (offset >> 8)); - *ptr++ = (mDNSu8)( offset & 0xFF); - return(ptr); - } - else // Else copy one label and try again - { - int i; - mDNSu8 len = *np++; - // If we don't at least have enough space for this label *plus* a terminating zero on the end, give up - if (ptr + 1 + len >= limit) return(mDNSNULL); - *ptr++ = len; - for (i=0; i> 8 ) & 0xFF); - ptr[1] = (mDNSu8)((val ) & 0xFF); - return ptr + sizeof(mDNSOpaque16); - } - -mDNSlocal mDNSu8 *putVal32(mDNSu8 *ptr, mDNSu32 val) - { - ptr[0] = (mDNSu8)((val >> 24) & 0xFF); - ptr[1] = (mDNSu8)((val >> 16) & 0xFF); - ptr[2] = (mDNSu8)((val >> 8) & 0xFF); - ptr[3] = (mDNSu8)((val ) & 0xFF); - return ptr + sizeof(mDNSu32); - } - -// msg points to the message we're building (pass mDNSNULL if we don't want to use compression pointers) -mDNSexport mDNSu8 *putRData(const DNSMessage *const msg, mDNSu8 *ptr, const mDNSu8 *const limit, const ResourceRecord *const rr) - { - const RDataBody2 *const rdb = (RDataBody2 *)rr->rdata->u.data; - switch (rr->rrtype) - { - case kDNSType_A: if (rr->rdlength != 4) - { debugf("putRData: Illegal length %d for kDNSType_A", rr->rdlength); return(mDNSNULL); } - if (ptr + 4 > limit) return(mDNSNULL); - *ptr++ = rdb->ipv4.b[0]; - *ptr++ = rdb->ipv4.b[1]; - *ptr++ = rdb->ipv4.b[2]; - *ptr++ = rdb->ipv4.b[3]; - return(ptr); - - case kDNSType_NS: - case kDNSType_CNAME: - case kDNSType_PTR: - case kDNSType_DNAME:return(putDomainNameAsLabels(msg, ptr, limit, &rdb->name)); - - case kDNSType_SOA: ptr = putDomainNameAsLabels(msg, ptr, limit, &rdb->soa.mname); - if (!ptr) return(mDNSNULL); - ptr = putDomainNameAsLabels(msg, ptr, limit, &rdb->soa.rname); - if (!ptr || ptr + 20 > limit) return(mDNSNULL); - ptr = putVal32(ptr, rdb->soa.serial); - ptr = putVal32(ptr, rdb->soa.refresh); - ptr = putVal32(ptr, rdb->soa.retry); - ptr = putVal32(ptr, rdb->soa.expire); - ptr = putVal32(ptr, rdb->soa.min); - return(ptr); - - case kDNSType_NULL: - case kDNSType_HINFO: - case kDNSType_TSIG: - case kDNSType_TXT: - case kDNSType_X25: - case kDNSType_ISDN: - case kDNSType_LOC: - case kDNSType_DHCID:if (ptr + rr->rdlength > limit) return(mDNSNULL); - mDNSPlatformMemCopy(ptr, rdb->data, rr->rdlength); - return(ptr + rr->rdlength); - - case kDNSType_MX: - case kDNSType_AFSDB: - case kDNSType_RT: - case kDNSType_KX: if (ptr + 3 > limit) return(mDNSNULL); - ptr = putVal16(ptr, rdb->mx.preference); - return(putDomainNameAsLabels(msg, ptr, limit, &rdb->mx.exchange)); - - case kDNSType_RP: ptr = putDomainNameAsLabels(msg, ptr, limit, &rdb->rp.mbox); - if (!ptr) return(mDNSNULL); - ptr = putDomainNameAsLabels(msg, ptr, limit, &rdb->rp.txt); - return(ptr); - - case kDNSType_PX: if (ptr + 5 > limit) return(mDNSNULL); - ptr = putVal16(ptr, rdb->px.preference); - ptr = putDomainNameAsLabels(msg, ptr, limit, &rdb->px.map822); - if (!ptr) return(mDNSNULL); - ptr = putDomainNameAsLabels(msg, ptr, limit, &rdb->px.mapx400); - return(ptr); - - case kDNSType_AAAA: if (rr->rdlength != sizeof(rdb->ipv6)) - { debugf("putRData: Illegal length %d for kDNSType_AAAA", rr->rdlength); return(mDNSNULL); } - if (ptr + sizeof(rdb->ipv6) > limit) return(mDNSNULL); - mDNSPlatformMemCopy(ptr, &rdb->ipv6, sizeof(rdb->ipv6)); - return(ptr + sizeof(rdb->ipv6)); - - case kDNSType_SRV: if (ptr + 7 > limit) return(mDNSNULL); - *ptr++ = (mDNSu8)(rdb->srv.priority >> 8); - *ptr++ = (mDNSu8)(rdb->srv.priority & 0xFF); - *ptr++ = (mDNSu8)(rdb->srv.weight >> 8); - *ptr++ = (mDNSu8)(rdb->srv.weight & 0xFF); - *ptr++ = rdb->srv.port.b[0]; - *ptr++ = rdb->srv.port.b[1]; - return(putDomainNameAsLabels(msg, ptr, limit, &rdb->srv.target)); - - case kDNSType_OPT: { - int len = 0; - const rdataOPT *opt; - const rdataOPT *const end = (const rdataOPT *)&rr->rdata->u.data[rr->rdlength]; - for (opt = &rr->rdata->u.opt[0]; opt < end; opt++) len += DNSOpt_Data_Space(opt); - if (ptr + len > limit) { LogMsg("ERROR: putOptRData - out of space"); return mDNSNULL; } - - for (opt = &rr->rdata->u.opt[0]; opt < end; opt++) - { - const int space = DNSOpt_Data_Space(opt); - ptr = putVal16(ptr, opt->opt); - ptr = putVal16(ptr, (mDNSu16)space - 4); - switch (opt->opt) - { - case kDNSOpt_LLQ: - ptr = putVal16(ptr, opt->u.llq.vers); - ptr = putVal16(ptr, opt->u.llq.llqOp); - ptr = putVal16(ptr, opt->u.llq.err); - mDNSPlatformMemCopy(ptr, opt->u.llq.id.b, 8); // 8-byte id - ptr += 8; - ptr = putVal32(ptr, opt->u.llq.llqlease); - break; - case kDNSOpt_Lease: - ptr = putVal32(ptr, opt->u.updatelease); - break; - case kDNSOpt_Owner: - *ptr++ = opt->u.owner.vers; - *ptr++ = opt->u.owner.seq; - mDNSPlatformMemCopy(ptr, opt->u.owner.HMAC.b, 6); // 6-byte Host identifier - ptr += 6; - if (space >= DNSOpt_OwnerData_ID_Wake_Space) - { - mDNSPlatformMemCopy(ptr, opt->u.owner.IMAC.b, 6); // 6-byte interface MAC - ptr += 6; - if (space > DNSOpt_OwnerData_ID_Wake_Space) - { - mDNSPlatformMemCopy(ptr, opt->u.owner.password.b, space - DNSOpt_OwnerData_ID_Wake_Space); - ptr += space - DNSOpt_OwnerData_ID_Wake_Space; - } - } - break; - } - } - return ptr; - } - - case kDNSType_NSEC: { - // For our simplified use of NSEC synthetic records: - // nextname is always the record's own name, - // the block number is always 0, - // the count byte is a value in the range 1-32, - // followed by the 1-32 data bytes - int i, j; - for (i=sizeof(rdataNSEC); i>0; i--) if (rdb->nsec.bitmap[i-1]) break; - ptr = putDomainNameAsLabels(msg, ptr, limit, rr->name); - if (!ptr) return(mDNSNULL); - if (i) // Only put a block if at least one type exists for this name - { - if (ptr + 2 + i > limit) return(mDNSNULL); - *ptr++ = 0; - *ptr++ = (mDNSu8)i; - for (j=0; jnsec.bitmap[j]; - } - return ptr; - } - - default: debugf("putRData: Warning! Writing unknown resource type %d as raw data", rr->rrtype); - if (ptr + rr->rdlength > limit) return(mDNSNULL); - mDNSPlatformMemCopy(ptr, rdb->data, rr->rdlength); - return(ptr + rr->rdlength); - } - } - -#define IsUnicastUpdate(X) (!mDNSOpaque16IsZero((X)->h.id) && ((X)->h.flags.b[0] & kDNSFlag0_OP_Mask) == kDNSFlag0_OP_Update) - -mDNSexport mDNSu8 *PutResourceRecordTTLWithLimit(DNSMessage *const msg, mDNSu8 *ptr, mDNSu16 *count, ResourceRecord *rr, mDNSu32 ttl, const mDNSu8 *limit) - { - mDNSu8 *endofrdata; - mDNSu16 actualLength; - // When sending SRV to conventional DNS server (i.e. in DNS update requests) we should not do name compression on the rdata (RFC 2782) - const DNSMessage *const rdatacompressionbase = (IsUnicastUpdate(msg) && rr->rrtype == kDNSType_SRV) ? mDNSNULL : msg; - - if (rr->RecordType == kDNSRecordTypeUnregistered) - { - LogMsg("PutResourceRecord ERROR! Attempt to put kDNSRecordTypeUnregistered %##s (%s)", rr->name->c, DNSTypeName(rr->rrtype)); - return(ptr); - } - - if (!ptr) { LogMsg("PutResourceRecordTTLWithLimit ptr is null"); return(mDNSNULL); } - - ptr = putDomainNameAsLabels(msg, ptr, limit, rr->name); - if (!ptr || ptr + 10 >= limit) return(mDNSNULL); // If we're out-of-space, return mDNSNULL - ptr[0] = (mDNSu8)(rr->rrtype >> 8); - ptr[1] = (mDNSu8)(rr->rrtype & 0xFF); - ptr[2] = (mDNSu8)(rr->rrclass >> 8); - ptr[3] = (mDNSu8)(rr->rrclass & 0xFF); - ptr[4] = (mDNSu8)((ttl >> 24) & 0xFF); - ptr[5] = (mDNSu8)((ttl >> 16) & 0xFF); - ptr[6] = (mDNSu8)((ttl >> 8) & 0xFF); - ptr[7] = (mDNSu8)( ttl & 0xFF); - // ptr[8] and ptr[9] filled in *after* we find out how much space the rdata takes - - endofrdata = putRData(rdatacompressionbase, ptr+10, limit, rr); - if (!endofrdata) { verbosedebugf("Ran out of space in PutResourceRecord for %##s (%s)", rr->name->c, DNSTypeName(rr->rrtype)); return(mDNSNULL); } - - // Go back and fill in the actual number of data bytes we wrote - // (actualLength can be less than rdlength when domain name compression is used) - actualLength = (mDNSu16)(endofrdata - ptr - 10); - ptr[8] = (mDNSu8)(actualLength >> 8); - ptr[9] = (mDNSu8)(actualLength & 0xFF); - - if (count) (*count)++; - else LogMsg("PutResourceRecordTTL: ERROR: No target count to update for %##s (%s)", rr->name->c, DNSTypeName(rr->rrtype)); - return(endofrdata); - } - -mDNSlocal mDNSu8 *putEmptyResourceRecord(DNSMessage *const msg, mDNSu8 *ptr, const mDNSu8 *const limit, mDNSu16 *count, const AuthRecord *rr) - { - ptr = putDomainNameAsLabels(msg, ptr, limit, rr->resrec.name); - if (!ptr || ptr + 10 > limit) return(mDNSNULL); // If we're out-of-space, return mDNSNULL - ptr[0] = (mDNSu8)(rr->resrec.rrtype >> 8); // Put type - ptr[1] = (mDNSu8)(rr->resrec.rrtype & 0xFF); - ptr[2] = (mDNSu8)(rr->resrec.rrclass >> 8); // Put class - ptr[3] = (mDNSu8)(rr->resrec.rrclass & 0xFF); - ptr[4] = ptr[5] = ptr[6] = ptr[7] = 0; // TTL is zero - ptr[8] = ptr[9] = 0; // RDATA length is zero - (*count)++; - return(ptr + 10); - } - -mDNSexport mDNSu8 *putQuestion(DNSMessage *const msg, mDNSu8 *ptr, const mDNSu8 *const limit, const domainname *const name, mDNSu16 rrtype, mDNSu16 rrclass) - { - ptr = putDomainNameAsLabels(msg, ptr, limit, name); - if (!ptr || ptr+4 >= limit) return(mDNSNULL); // If we're out-of-space, return mDNSNULL - ptr[0] = (mDNSu8)(rrtype >> 8); - ptr[1] = (mDNSu8)(rrtype & 0xFF); - ptr[2] = (mDNSu8)(rrclass >> 8); - ptr[3] = (mDNSu8)(rrclass & 0xFF); - msg->h.numQuestions++; - return(ptr+4); - } - -// for dynamic updates -mDNSexport mDNSu8 *putZone(DNSMessage *const msg, mDNSu8 *ptr, mDNSu8 *limit, const domainname *zone, mDNSOpaque16 zoneClass) - { - ptr = putDomainNameAsLabels(msg, ptr, limit, zone); - if (!ptr || ptr + 4 > limit) return mDNSNULL; // If we're out-of-space, return NULL - *ptr++ = (mDNSu8)(kDNSType_SOA >> 8); - *ptr++ = (mDNSu8)(kDNSType_SOA & 0xFF); - *ptr++ = zoneClass.b[0]; - *ptr++ = zoneClass.b[1]; - msg->h.mDNS_numZones++; - return ptr; - } - -// for dynamic updates -mDNSexport mDNSu8 *putPrereqNameNotInUse(const domainname *const name, DNSMessage *const msg, mDNSu8 *const ptr, mDNSu8 *const end) - { - AuthRecord prereq; - mDNS_SetupResourceRecord(&prereq, mDNSNULL, mDNSInterface_Any, kDNSQType_ANY, kStandardTTL, 0, AuthRecordAny, mDNSNULL, mDNSNULL); - AssignDomainName(&prereq.namestorage, name); - prereq.resrec.rrtype = kDNSQType_ANY; - prereq.resrec.rrclass = kDNSClass_NONE; - return putEmptyResourceRecord(msg, ptr, end, &msg->h.mDNS_numPrereqs, &prereq); - } - -// for dynamic updates -mDNSexport mDNSu8 *putDeletionRecord(DNSMessage *msg, mDNSu8 *ptr, ResourceRecord *rr) - { - // deletion: specify record w/ TTL 0, class NONE - const mDNSu16 origclass = rr->rrclass; - rr->rrclass = kDNSClass_NONE; - ptr = PutResourceRecordTTLJumbo(msg, ptr, &msg->h.mDNS_numUpdates, rr, 0); - rr->rrclass = origclass; - return ptr; - } - -// for dynamic updates -mDNSexport mDNSu8 *putDeletionRecordWithLimit(DNSMessage *msg, mDNSu8 *ptr, ResourceRecord *rr, mDNSu8 *limit) - { - // deletion: specify record w/ TTL 0, class NONE - const mDNSu16 origclass = rr->rrclass; - rr->rrclass = kDNSClass_NONE; - ptr = PutResourceRecordTTLWithLimit(msg, ptr, &msg->h.mDNS_numUpdates, rr, 0, limit); - rr->rrclass = origclass; - return ptr; - } - -mDNSexport mDNSu8 *putDeleteRRSetWithLimit(DNSMessage *msg, mDNSu8 *ptr, const domainname *name, mDNSu16 rrtype, mDNSu8 *limit) - { - mDNSu16 class = kDNSQClass_ANY; - - ptr = putDomainNameAsLabels(msg, ptr, limit, name); - if (!ptr || ptr + 10 >= limit) return mDNSNULL; // If we're out-of-space, return mDNSNULL - ptr[0] = (mDNSu8)(rrtype >> 8); - ptr[1] = (mDNSu8)(rrtype & 0xFF); - ptr[2] = (mDNSu8)(class >> 8); - ptr[3] = (mDNSu8)(class & 0xFF); - ptr[4] = ptr[5] = ptr[6] = ptr[7] = 0; // zero ttl - ptr[8] = ptr[9] = 0; // zero rdlength/rdata - - msg->h.mDNS_numUpdates++; - return ptr + 10; - } - -// for dynamic updates -mDNSexport mDNSu8 *putDeleteAllRRSets(DNSMessage *msg, mDNSu8 *ptr, const domainname *name) - { - const mDNSu8 *limit = msg->data + AbsoluteMaxDNSMessageData; - mDNSu16 class = kDNSQClass_ANY; - mDNSu16 rrtype = kDNSQType_ANY; - - ptr = putDomainNameAsLabels(msg, ptr, limit, name); - if (!ptr || ptr + 10 >= limit) return mDNSNULL; // If we're out-of-space, return mDNSNULL - ptr[0] = (mDNSu8)(rrtype >> 8); - ptr[1] = (mDNSu8)(rrtype & 0xFF); - ptr[2] = (mDNSu8)(class >> 8); - ptr[3] = (mDNSu8)(class & 0xFF); - ptr[4] = ptr[5] = ptr[6] = ptr[7] = 0; // zero ttl - ptr[8] = ptr[9] = 0; // zero rdlength/rdata - - msg->h.mDNS_numUpdates++; - return ptr + 10; - } - -// for dynamic updates -mDNSexport mDNSu8 *putUpdateLease(DNSMessage *msg, mDNSu8 *end, mDNSu32 lease) - { - AuthRecord rr; - mDNS_SetupResourceRecord(&rr, mDNSNULL, mDNSInterface_Any, kDNSType_OPT, kStandardTTL, kDNSRecordTypeKnownUnique, AuthRecordAny, mDNSNULL, mDNSNULL); - rr.resrec.rrclass = NormalMaxDNSMessageData; - rr.resrec.rdlength = sizeof(rdataOPT); // One option in this OPT record - rr.resrec.rdestimate = sizeof(rdataOPT); - rr.resrec.rdata->u.opt[0].opt = kDNSOpt_Lease; - rr.resrec.rdata->u.opt[0].u.updatelease = lease; - end = PutResourceRecordTTLJumbo(msg, end, &msg->h.numAdditionals, &rr.resrec, 0); - if (!end) { LogMsg("ERROR: putUpdateLease - PutResourceRecordTTL"); return mDNSNULL; } - return end; - } - -// for dynamic updates -mDNSexport mDNSu8 *putUpdateLeaseWithLimit(DNSMessage *msg, mDNSu8 *end, mDNSu32 lease, mDNSu8 *limit) - { - AuthRecord rr; - mDNS_SetupResourceRecord(&rr, mDNSNULL, mDNSInterface_Any, kDNSType_OPT, kStandardTTL, kDNSRecordTypeKnownUnique, AuthRecordAny, mDNSNULL, mDNSNULL); - rr.resrec.rrclass = NormalMaxDNSMessageData; - rr.resrec.rdlength = sizeof(rdataOPT); // One option in this OPT record - rr.resrec.rdestimate = sizeof(rdataOPT); - rr.resrec.rdata->u.opt[0].opt = kDNSOpt_Lease; - rr.resrec.rdata->u.opt[0].u.updatelease = lease; - end = PutResourceRecordTTLWithLimit(msg, end, &msg->h.numAdditionals, &rr.resrec, 0, limit); - if (!end) { LogMsg("ERROR: putUpdateLease - PutResourceRecordTTLWithLimit"); return mDNSNULL; } - return end; - } - -mDNSexport mDNSu8 *putHINFO(const mDNS *const m, DNSMessage *const msg, mDNSu8 *end, DomainAuthInfo *authInfo, mDNSu8 *limit) - { - if (authInfo && authInfo->AutoTunnel) - { - AuthRecord hinfo; - mDNSu8 *h = hinfo.rdatastorage.u.data; - mDNSu16 len = 2 + m->HIHardware.c[0] + m->HISoftware.c[0]; - mDNSu8 *newptr; - mDNS_SetupResourceRecord(&hinfo, mDNSNULL, mDNSInterface_Any, kDNSType_HINFO, 0, kDNSRecordTypeUnique, AuthRecordAny, mDNSNULL, mDNSNULL); - AppendDomainLabel(&hinfo.namestorage, &m->hostlabel); - AppendDomainName (&hinfo.namestorage, &authInfo->domain); - hinfo.resrec.rroriginalttl = 0; - mDNSPlatformMemCopy(h, &m->HIHardware, 1 + (mDNSu32)m->HIHardware.c[0]); - h += 1 + (int)h[0]; - mDNSPlatformMemCopy(h, &m->HISoftware, 1 + (mDNSu32)m->HISoftware.c[0]); - hinfo.resrec.rdlength = len; - hinfo.resrec.rdestimate = len; - newptr = PutResourceRecordTTLWithLimit(msg, end, &msg->h.numAdditionals, &hinfo.resrec, 0, limit); - return newptr; - } - else - return end; - } - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - DNS Message Parsing Functions -#endif - -mDNSexport mDNSu32 DomainNameHashValue(const domainname *const name) - { - mDNSu32 sum = 0; - const mDNSu8 *c; - - for (c = name->c; c[0] != 0 && c[1] != 0; c += 2) - { - sum += ((mDNSIsUpperCase(c[0]) ? c[0] + 'a' - 'A' : c[0]) << 8) | - (mDNSIsUpperCase(c[1]) ? c[1] + 'a' - 'A' : c[1]); - sum = (sum<<3) | (sum>>29); - } - if (c[0]) sum += ((mDNSIsUpperCase(c[0]) ? c[0] + 'a' - 'A' : c[0]) << 8); - return(sum); - } - -mDNSexport void SetNewRData(ResourceRecord *const rr, RData *NewRData, mDNSu16 rdlength) - { - domainname *target; - if (NewRData) - { - rr->rdata = NewRData; - rr->rdlength = rdlength; - } - // Must not try to get target pointer until after updating rr->rdata - target = GetRRDomainNameTarget(rr); - rr->rdlength = GetRDLength(rr, mDNSfalse); - rr->rdestimate = GetRDLength(rr, mDNStrue); - rr->rdatahash = target ? DomainNameHashValue(target) : RDataHashValue(rr); - } - -mDNSexport const mDNSu8 *skipDomainName(const DNSMessage *const msg, const mDNSu8 *ptr, const mDNSu8 *const end) - { - mDNSu16 total = 0; - - if (ptr < (mDNSu8*)msg || ptr >= end) - { debugf("skipDomainName: Illegal ptr not within packet boundaries"); return(mDNSNULL); } - - while (1) // Read sequence of labels - { - const mDNSu8 len = *ptr++; // Read length of this label - if (len == 0) return(ptr); // If length is zero, that means this name is complete - switch (len & 0xC0) - { - case 0x00: if (ptr + len >= end) // Remember: expect at least one more byte for the root label - { debugf("skipDomainName: Malformed domain name (overruns packet end)"); return(mDNSNULL); } - if (total + 1 + len >= MAX_DOMAIN_NAME) // Remember: expect at least one more byte for the root label - { debugf("skipDomainName: Malformed domain name (more than 256 characters)"); return(mDNSNULL); } - ptr += len; - total += 1 + len; - break; - - case 0x40: debugf("skipDomainName: Extended EDNS0 label types 0x%X not supported", len); return(mDNSNULL); - case 0x80: debugf("skipDomainName: Illegal label length 0x%X", len); return(mDNSNULL); - case 0xC0: return(ptr+1); - } - } - } - -// Routine to fetch an FQDN from the DNS message, following compression pointers if necessary. -mDNSexport const mDNSu8 *getDomainName(const DNSMessage *const msg, const mDNSu8 *ptr, const mDNSu8 *const end, - domainname *const name) - { - const mDNSu8 *nextbyte = mDNSNULL; // Record where we got to before we started following pointers - mDNSu8 *np = name->c; // Name pointer - const mDNSu8 *const limit = np + MAX_DOMAIN_NAME; // Limit so we don't overrun buffer - - if (ptr < (mDNSu8*)msg || ptr >= end) - { debugf("getDomainName: Illegal ptr not within packet boundaries"); return(mDNSNULL); } - - *np = 0; // Tentatively place the root label here (may be overwritten if we have more labels) - - while (1) // Read sequence of labels - { - const mDNSu8 len = *ptr++; // Read length of this label - if (len == 0) break; // If length is zero, that means this name is complete - switch (len & 0xC0) - { - int i; - mDNSu16 offset; - - case 0x00: if (ptr + len >= end) // Remember: expect at least one more byte for the root label - { debugf("getDomainName: Malformed domain name (overruns packet end)"); return(mDNSNULL); } - if (np + 1 + len >= limit) // Remember: expect at least one more byte for the root label - { debugf("getDomainName: Malformed domain name (more than 256 characters)"); return(mDNSNULL); } - *np++ = len; - for (i=0; ic); - return(mDNSNULL); - - case 0x80: debugf("getDomainName: Illegal label length 0x%X in domain name %##s", len, name->c); return(mDNSNULL); - - case 0xC0: offset = (mDNSu16)((((mDNSu16)(len & 0x3F)) << 8) | *ptr++); - if (!nextbyte) nextbyte = ptr; // Record where we got to before we started following pointers - ptr = (mDNSu8 *)msg + offset; - if (ptr < (mDNSu8*)msg || ptr >= end) - { debugf("getDomainName: Illegal compression pointer not within packet boundaries"); return(mDNSNULL); } - if (*ptr & 0xC0) - { debugf("getDomainName: Compression pointer must point to real label"); return(mDNSNULL); } - break; - } - } - - if (nextbyte) return(nextbyte); - else return(ptr); - } - -mDNSexport const mDNSu8 *skipResourceRecord(const DNSMessage *msg, const mDNSu8 *ptr, const mDNSu8 *end) - { - mDNSu16 pktrdlength; - - ptr = skipDomainName(msg, ptr, end); - if (!ptr) { debugf("skipResourceRecord: Malformed RR name"); return(mDNSNULL); } - - if (ptr + 10 > end) { debugf("skipResourceRecord: Malformed RR -- no type/class/ttl/len!"); return(mDNSNULL); } - pktrdlength = (mDNSu16)((mDNSu16)ptr[8] << 8 | ptr[9]); - ptr += 10; - if (ptr + pktrdlength > end) { debugf("skipResourceRecord: RDATA exceeds end of packet"); return(mDNSNULL); } - - return(ptr + pktrdlength); - } - -mDNSexport const mDNSu8 *GetLargeResourceRecord(mDNS *const m, const DNSMessage *const msg, const mDNSu8 *ptr, - const mDNSu8 *end, const mDNSInterfaceID InterfaceID, mDNSu8 RecordType, LargeCacheRecord *const largecr) - { - CacheRecord *const rr = &largecr->r; - RDataBody2 *const rdb = (RDataBody2 *)rr->smallrdatastorage.data; - mDNSu16 pktrdlength; - - if (largecr == &m->rec && m->rec.r.resrec.RecordType) - { - LogMsg("GetLargeResourceRecord: m->rec appears to be already in use for %s", CRDisplayString(m, &m->rec.r)); -#if ForceAlerts - *(long*)0 = 0; -#endif - } - - rr->next = mDNSNULL; - rr->resrec.name = &largecr->namestorage; - - rr->NextInKAList = mDNSNULL; - rr->TimeRcvd = m ? m->timenow : 0; - rr->DelayDelivery = 0; - rr->NextRequiredQuery = m ? m->timenow : 0; // Will be updated to the real value when we call SetNextCacheCheckTimeForRecord() - rr->LastUsed = m ? m->timenow : 0; - rr->CRActiveQuestion = mDNSNULL; - rr->UnansweredQueries = 0; - rr->LastUnansweredTime= 0; -#if ENABLE_MULTI_PACKET_QUERY_SNOOPING - rr->MPUnansweredQ = 0; - rr->MPLastUnansweredQT= 0; - rr->MPUnansweredKA = 0; - rr->MPExpectingKA = mDNSfalse; -#endif - rr->NextInCFList = mDNSNULL; - - rr->resrec.InterfaceID = InterfaceID; - rr->resrec.rDNSServer = mDNSNULL; - - ptr = getDomainName(msg, ptr, end, &largecr->namestorage); // Will bail out correctly if ptr is NULL - if (!ptr) { debugf("GetLargeResourceRecord: Malformed RR name"); return(mDNSNULL); } - rr->resrec.namehash = DomainNameHashValue(rr->resrec.name); - - if (ptr + 10 > end) { debugf("GetLargeResourceRecord: Malformed RR -- no type/class/ttl/len!"); return(mDNSNULL); } - - rr->resrec.rrtype = (mDNSu16) ((mDNSu16)ptr[0] << 8 | ptr[1]); - rr->resrec.rrclass = (mDNSu16)(((mDNSu16)ptr[2] << 8 | ptr[3]) & kDNSClass_Mask); - rr->resrec.rroriginalttl = (mDNSu32) ((mDNSu32)ptr[4] << 24 | (mDNSu32)ptr[5] << 16 | (mDNSu32)ptr[6] << 8 | ptr[7]); - if (rr->resrec.rroriginalttl > 0x70000000UL / mDNSPlatformOneSecond && (mDNSs32)rr->resrec.rroriginalttl != -1) - rr->resrec.rroriginalttl = 0x70000000UL / mDNSPlatformOneSecond; - // Note: We don't have to adjust m->NextCacheCheck here -- this is just getting a record into memory for - // us to look at. If we decide to copy it into the cache, then we'll update m->NextCacheCheck accordingly. - pktrdlength = (mDNSu16)((mDNSu16)ptr[8] << 8 | ptr[9]); - - // If mDNS record has cache-flush bit set, we mark it unique - // For uDNS records, all are implicitly deemed unique (a single DNS server is always - // authoritative for the entire RRSet), unless this is a truncated response - if (ptr[2] & (kDNSClass_UniqueRRSet >> 8) || (!InterfaceID && !(msg->h.flags.b[0] & kDNSFlag0_TC))) - RecordType |= kDNSRecordTypePacketUniqueMask; - ptr += 10; - if (ptr + pktrdlength > end) { debugf("GetLargeResourceRecord: RDATA exceeds end of packet"); return(mDNSNULL); } - end = ptr + pktrdlength; // Adjust end to indicate the end of the rdata for this resource record - - rr->resrec.rdata = (RData*)&rr->smallrdatastorage; - rr->resrec.rdata->MaxRDLength = MaximumRDSize; - - if (!RecordType) LogMsg("GetLargeResourceRecord: No RecordType for %##s", rr->resrec.name->c); - - // IMPORTANT: Any record type we understand and unpack into a structure containing domainnames needs to have corresponding - // cases in SameRDataBody() and RDataHashValue() to do a semantic comparison (or checksum) of the structure instead of a blind - // bitwise memory compare (or sum). This is because a domainname is a fixed size structure holding variable-length data. - // Any bytes past the logical end of the name are undefined, and a blind bitwise memory compare may indicate that - // two domainnames are different when semantically they are the same name and it's only the unused bytes that differ. - if (rr->resrec.rrclass == kDNSQClass_ANY && pktrdlength == 0) // Used in update packets to mean "Delete An RRset" (RFC 2136) - rr->resrec.rdlength = 0; - else switch (rr->resrec.rrtype) - { - case kDNSType_A: if (pktrdlength != sizeof(mDNSv4Addr)) goto fail; - rdb->ipv4.b[0] = ptr[0]; - rdb->ipv4.b[1] = ptr[1]; - rdb->ipv4.b[2] = ptr[2]; - rdb->ipv4.b[3] = ptr[3]; - break; - - case kDNSType_NS: - case kDNSType_CNAME: - case kDNSType_PTR: - case kDNSType_DNAME:ptr = getDomainName(msg, ptr, end, &rdb->name); - if (ptr != end) { debugf("GetLargeResourceRecord: Malformed CNAME/PTR RDATA name"); goto fail; } - //debugf("%##s PTR %##s rdlen %d", rr->resrec.name.c, rdb->name.c, pktrdlength); - break; - - case kDNSType_SOA: ptr = getDomainName(msg, ptr, end, &rdb->soa.mname); - if (!ptr) { debugf("GetLargeResourceRecord: Malformed SOA RDATA mname"); goto fail; } - ptr = getDomainName(msg, ptr, end, &rdb->soa.rname); - if (!ptr) { debugf("GetLargeResourceRecord: Malformed SOA RDATA rname"); goto fail; } - if (ptr + 0x14 != end) { debugf("GetLargeResourceRecord: Malformed SOA RDATA"); goto fail; } - rdb->soa.serial = (mDNSs32) ((mDNSs32)ptr[0x00] << 24 | (mDNSs32)ptr[0x01] << 16 | (mDNSs32)ptr[0x02] << 8 | ptr[0x03]); - rdb->soa.refresh = (mDNSu32) ((mDNSu32)ptr[0x04] << 24 | (mDNSu32)ptr[0x05] << 16 | (mDNSu32)ptr[0x06] << 8 | ptr[0x07]); - rdb->soa.retry = (mDNSu32) ((mDNSu32)ptr[0x08] << 24 | (mDNSu32)ptr[0x09] << 16 | (mDNSu32)ptr[0x0A] << 8 | ptr[0x0B]); - rdb->soa.expire = (mDNSu32) ((mDNSu32)ptr[0x0C] << 24 | (mDNSu32)ptr[0x0D] << 16 | (mDNSu32)ptr[0x0E] << 8 | ptr[0x0F]); - rdb->soa.min = (mDNSu32) ((mDNSu32)ptr[0x10] << 24 | (mDNSu32)ptr[0x11] << 16 | (mDNSu32)ptr[0x12] << 8 | ptr[0x13]); - break; - - case kDNSType_NULL: - case kDNSType_HINFO: - case kDNSType_TSIG: - case kDNSType_TXT: - case kDNSType_X25: - case kDNSType_ISDN: - case kDNSType_LOC: - case kDNSType_DHCID:if (pktrdlength > rr->resrec.rdata->MaxRDLength) - { - debugf("GetLargeResourceRecord: %s rdata size (%d) exceeds storage (%d)", - DNSTypeName(rr->resrec.rrtype), pktrdlength, rr->resrec.rdata->MaxRDLength); - goto fail; - } - rr->resrec.rdlength = pktrdlength; - mDNSPlatformMemCopy(rdb->data, ptr, pktrdlength); - break; - - case kDNSType_MX: - case kDNSType_AFSDB: - case kDNSType_RT: - case kDNSType_KX: if (pktrdlength < 3) goto fail; // Preference + domainname - rdb->mx.preference = (mDNSu16)((mDNSu16)ptr[0] << 8 | ptr[1]); - ptr = getDomainName(msg, ptr+2, end, &rdb->mx.exchange); - if (ptr != end) { debugf("GetLargeResourceRecord: Malformed MX name"); goto fail; } - //debugf("%##s SRV %##s rdlen %d", rr->resrec.name.c, rdb->srv.target.c, pktrdlength); - break; - - case kDNSType_RP: ptr = getDomainName(msg, ptr, end, &rdb->rp.mbox); // Domainname + domainname - if (!ptr) { debugf("GetLargeResourceRecord: Malformed RP mbox"); goto fail; } - ptr = getDomainName(msg, ptr, end, &rdb->rp.txt); - if (ptr != end) { debugf("GetLargeResourceRecord: Malformed RP txt"); goto fail; } - break; - - case kDNSType_PX: if (pktrdlength < 4) goto fail; // Preference + domainname + domainname - rdb->px.preference = (mDNSu16)((mDNSu16)ptr[0] << 8 | ptr[1]); - ptr = getDomainName(msg, ptr, end, &rdb->px.map822); - if (!ptr) { debugf("GetLargeResourceRecord: Malformed PX map822"); goto fail; } - ptr = getDomainName(msg, ptr, end, &rdb->px.mapx400); - if (ptr != end) { debugf("GetLargeResourceRecord: Malformed PX mapx400"); goto fail; } - break; - - case kDNSType_AAAA: if (pktrdlength != sizeof(mDNSv6Addr)) goto fail; - mDNSPlatformMemCopy(&rdb->ipv6, ptr, sizeof(rdb->ipv6)); - break; - - case kDNSType_SRV: if (pktrdlength < 7) goto fail; // Priority + weight + port + domainname - rdb->srv.priority = (mDNSu16)((mDNSu16)ptr[0] << 8 | ptr[1]); - rdb->srv.weight = (mDNSu16)((mDNSu16)ptr[2] << 8 | ptr[3]); - rdb->srv.port.b[0] = ptr[4]; - rdb->srv.port.b[1] = ptr[5]; - ptr = getDomainName(msg, ptr+6, end, &rdb->srv.target); - if (ptr != end) { debugf("GetLargeResourceRecord: Malformed SRV RDATA name"); goto fail; } - //debugf("%##s SRV %##s rdlen %d", rr->resrec.name.c, rdb->srv.target.c, pktrdlength); - break; - - case kDNSType_OPT: { - rdataOPT *opt = rr->resrec.rdata->u.opt; - rr->resrec.rdlength = 0; - while (ptr < end && (mDNSu8 *)(opt+1) < &rr->resrec.rdata->u.data[MaximumRDSize]) - { - const rdataOPT *const currentopt = opt; - if (ptr + 4 > end) { LogInfo("GetLargeResourceRecord: OPT RDATA ptr + 4 > end"); goto fail; } - opt->opt = (mDNSu16)((mDNSu16)ptr[0] << 8 | ptr[1]); - opt->optlen = (mDNSu16)((mDNSu16)ptr[2] << 8 | ptr[3]); - ptr += 4; - if (ptr + opt->optlen > end) { LogInfo("GetLargeResourceRecord: ptr + opt->optlen > end"); goto fail; } - switch (opt->opt) - { - case kDNSOpt_LLQ: - if (opt->optlen == DNSOpt_LLQData_Space - 4) - { - opt->u.llq.vers = (mDNSu16)((mDNSu16)ptr[0] << 8 | ptr[1]); - opt->u.llq.llqOp = (mDNSu16)((mDNSu16)ptr[2] << 8 | ptr[3]); - opt->u.llq.err = (mDNSu16)((mDNSu16)ptr[4] << 8 | ptr[5]); - mDNSPlatformMemCopy(opt->u.llq.id.b, ptr+6, 8); - opt->u.llq.llqlease = (mDNSu32) ((mDNSu32)ptr[14] << 24 | (mDNSu32)ptr[15] << 16 | (mDNSu32)ptr[16] << 8 | ptr[17]); - if (opt->u.llq.llqlease > 0x70000000UL / mDNSPlatformOneSecond) - opt->u.llq.llqlease = 0x70000000UL / mDNSPlatformOneSecond; - opt++; - } - break; - case kDNSOpt_Lease: - if (opt->optlen == DNSOpt_LeaseData_Space - 4) - { - opt->u.updatelease = (mDNSu32) ((mDNSu32)ptr[0] << 24 | (mDNSu32)ptr[1] << 16 | (mDNSu32)ptr[2] << 8 | ptr[3]); - if (opt->u.updatelease > 0x70000000UL / mDNSPlatformOneSecond) - opt->u.updatelease = 0x70000000UL / mDNSPlatformOneSecond; - opt++; - } - break; - case kDNSOpt_Owner: - if (ValidOwnerLength(opt->optlen)) - { - opt->u.owner.vers = ptr[0]; - opt->u.owner.seq = ptr[1]; - mDNSPlatformMemCopy(opt->u.owner.HMAC.b, ptr+2, 6); // 6-byte MAC address - mDNSPlatformMemCopy(opt->u.owner.IMAC.b, ptr+2, 6); // 6-byte MAC address - opt->u.owner.password = zeroEthAddr; - if (opt->optlen >= DNSOpt_OwnerData_ID_Wake_Space-4) - { - mDNSPlatformMemCopy(opt->u.owner.IMAC.b, ptr+8, 6); // 6-byte MAC address - // This mDNSPlatformMemCopy is safe because the ValidOwnerLength(opt->optlen) check above - // ensures that opt->optlen is no more than DNSOpt_OwnerData_ID_Wake_PW6_Space - 4 - if (opt->optlen > DNSOpt_OwnerData_ID_Wake_Space-4) - mDNSPlatformMemCopy(opt->u.owner.password.b, ptr+14, opt->optlen - (DNSOpt_OwnerData_ID_Wake_Space-4)); - } - opt++; - } - break; - } - ptr += currentopt->optlen; - } - rr->resrec.rdlength = (mDNSu16)((mDNSu8*)opt - rr->resrec.rdata->u.data); - if (ptr != end) { LogInfo("GetLargeResourceRecord: Malformed OptRdata"); goto fail; } - break; - } - - case kDNSType_NSEC: { - unsigned int i, j; - domainname d; - ptr = getDomainName(msg, ptr, end, &d); // Ignored for our simplified use of NSEC synthetic records - if (!ptr) { LogInfo("GetLargeResourceRecord: Malformed NSEC nextname"); goto fail; } - mDNSPlatformMemZero(rdb->nsec.bitmap, sizeof(rdb->nsec.bitmap)); - if (ptr < end) - { - if (*ptr++ != 0) { debugf("GetLargeResourceRecord: We only handle block zero NSECs"); goto fail; } - i = *ptr++; - if (i > sizeof(rdataNSEC)) { debugf("GetLargeResourceRecord: invalid block length %d", i); goto fail; } - for (j=0; jnsec.bitmap[j] = *ptr++; - } - if (ptr != end) { debugf("GetLargeResourceRecord: Malformed NSEC"); goto fail; } - break; - } - - default: if (pktrdlength > rr->resrec.rdata->MaxRDLength) - { - debugf("GetLargeResourceRecord: rdata %d (%s) size (%d) exceeds storage (%d)", - rr->resrec.rrtype, DNSTypeName(rr->resrec.rrtype), pktrdlength, rr->resrec.rdata->MaxRDLength); - goto fail; - } - debugf("GetLargeResourceRecord: Warning! Reading resource type %d (%s) as opaque data", - rr->resrec.rrtype, DNSTypeName(rr->resrec.rrtype)); - // Note: Just because we don't understand the record type, that doesn't - // mean we fail. The DNS protocol specifies rdlength, so we can - // safely skip over unknown records and ignore them. - // We also grab a binary copy of the rdata anyway, since the caller - // might know how to interpret it even if we don't. - rr->resrec.rdlength = pktrdlength; - mDNSPlatformMemCopy(rdb->data, ptr, pktrdlength); - break; - } - - SetNewRData(&rr->resrec, mDNSNULL, 0); // Sets rdlength, rdestimate, rdatahash for us - - // Success! Now fill in RecordType to show this record contains valid data - rr->resrec.RecordType = RecordType; - return(end); - -fail: - // If we were unable to parse the rdata in this record, we indicate that by - // returing a 'kDNSRecordTypePacketNegative' record with rdlength set to zero - rr->resrec.RecordType = kDNSRecordTypePacketNegative; - rr->resrec.rdlength = 0; - rr->resrec.rdestimate = 0; - rr->resrec.rdatahash = 0; - return(end); - } - -mDNSexport const mDNSu8 *skipQuestion(const DNSMessage *msg, const mDNSu8 *ptr, const mDNSu8 *end) - { - ptr = skipDomainName(msg, ptr, end); - if (!ptr) { debugf("skipQuestion: Malformed domain name in DNS question section"); return(mDNSNULL); } - if (ptr+4 > end) { debugf("skipQuestion: Malformed DNS question section -- no query type and class!"); return(mDNSNULL); } - return(ptr+4); - } - -mDNSexport const mDNSu8 *getQuestion(const DNSMessage *msg, const mDNSu8 *ptr, const mDNSu8 *end, const mDNSInterfaceID InterfaceID, - DNSQuestion *question) - { - mDNSPlatformMemZero(question, sizeof(*question)); - question->InterfaceID = InterfaceID; - if (!InterfaceID) question->TargetQID = onesID; // In DNSQuestions we use TargetQID as the indicator of whether it's unicast or multicast - ptr = getDomainName(msg, ptr, end, &question->qname); - if (!ptr) { debugf("Malformed domain name in DNS question section"); return(mDNSNULL); } - if (ptr+4 > end) { debugf("Malformed DNS question section -- no query type and class!"); return(mDNSNULL); } - - question->qnamehash = DomainNameHashValue(&question->qname); - question->qtype = (mDNSu16)((mDNSu16)ptr[0] << 8 | ptr[1]); // Get type - question->qclass = (mDNSu16)((mDNSu16)ptr[2] << 8 | ptr[3]); // and class - return(ptr+4); - } - -mDNSexport const mDNSu8 *LocateAnswers(const DNSMessage *const msg, const mDNSu8 *const end) - { - int i; - const mDNSu8 *ptr = msg->data; - for (i = 0; i < msg->h.numQuestions && ptr; i++) ptr = skipQuestion(msg, ptr, end); - return(ptr); - } - -mDNSexport const mDNSu8 *LocateAuthorities(const DNSMessage *const msg, const mDNSu8 *const end) - { - int i; - const mDNSu8 *ptr = LocateAnswers(msg, end); - for (i = 0; i < msg->h.numAnswers && ptr; i++) ptr = skipResourceRecord(msg, ptr, end); - return(ptr); - } - -mDNSexport const mDNSu8 *LocateAdditionals(const DNSMessage *const msg, const mDNSu8 *const end) - { - int i; - const mDNSu8 *ptr = LocateAuthorities(msg, end); - for (i = 0; i < msg->h.numAuthorities; i++) ptr = skipResourceRecord(msg, ptr, end); - return (ptr); - } - -mDNSexport const mDNSu8 *LocateOptRR(const DNSMessage *const msg, const mDNSu8 *const end, int minsize) - { - int i; - const mDNSu8 *ptr = LocateAdditionals(msg, end); - - // Locate the OPT record. - // According to RFC 2671, "One OPT pseudo-RR can be added to the additional data section of either a request or a response." - // This implies that there may be *at most* one OPT record per DNS message, in the Additional Section, - // but not necessarily the *last* entry in the Additional Section. - for (i = 0; ptr && i < msg->h.numAdditionals; i++) - { - if (ptr + DNSOpt_Header_Space + minsize <= end && // Make sure we have 11+minsize bytes of data - ptr[0] == 0 && // Name must be root label - ptr[1] == (kDNSType_OPT >> 8 ) && // rrtype OPT - ptr[2] == (kDNSType_OPT & 0xFF) && - ((mDNSu16)ptr[9] << 8 | (mDNSu16)ptr[10]) >= (mDNSu16)minsize) - return(ptr); - else - ptr = skipResourceRecord(msg, ptr, end); - } - return(mDNSNULL); - } - -// On success, GetLLQOptData returns pointer to storage within shared "m->rec"; -// it is caller's responsibilty to clear m->rec.r.resrec.RecordType after use -// Note: An OPT RDataBody actually contains one or more variable-length rdataOPT objects packed together -// The code that currently calls this assumes there's only one, instead of iterating through the set -mDNSexport const rdataOPT *GetLLQOptData(mDNS *const m, const DNSMessage *const msg, const mDNSu8 *const end) - { - const mDNSu8 *ptr = LocateOptRR(msg, end, DNSOpt_LLQData_Space); - if (ptr) - { - ptr = GetLargeResourceRecord(m, msg, ptr, end, 0, kDNSRecordTypePacketAdd, &m->rec); - if (ptr && m->rec.r.resrec.RecordType != kDNSRecordTypePacketNegative) return(&m->rec.r.resrec.rdata->u.opt[0]); - } - return(mDNSNULL); - } - -// Get the lease life of records in a dynamic update -// returns 0 on error or if no lease present -mDNSexport mDNSu32 GetPktLease(mDNS *m, DNSMessage *msg, const mDNSu8 *end) - { - mDNSu32 result = 0; - const mDNSu8 *ptr = LocateOptRR(msg, end, DNSOpt_LeaseData_Space); - if (ptr) ptr = GetLargeResourceRecord(m, msg, ptr, end, 0, kDNSRecordTypePacketAdd, &m->rec); - if (ptr && m->rec.r.resrec.rdlength >= DNSOpt_LeaseData_Space && m->rec.r.resrec.rdata->u.opt[0].opt == kDNSOpt_Lease) - result = m->rec.r.resrec.rdata->u.opt[0].u.updatelease; - m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it - return(result); - } - -mDNSlocal const mDNSu8 *DumpRecords(mDNS *const m, const DNSMessage *const msg, const mDNSu8 *ptr, const mDNSu8 *const end, int count, char *label) - { - int i; - LogMsg("%2d %s", count, label); - for (i = 0; i < count && ptr; i++) - { - // This puts a LargeCacheRecord on the stack instead of using the shared m->rec storage, - // but since it's only used for debugging (and probably only on OS X, not on - // embedded systems) putting a 9kB object on the stack isn't a big problem. - LargeCacheRecord largecr; - ptr = GetLargeResourceRecord(m, msg, ptr, end, mDNSInterface_Any, kDNSRecordTypePacketAns, &largecr); - if (ptr) LogMsg("%2d TTL%8d %s", i, largecr.r.resrec.rroriginalttl, CRDisplayString(m, &largecr.r)); - } - if (!ptr) LogMsg("ERROR: Premature end of packet data"); - return(ptr); - } - -#define DNS_OP_Name(X) ( \ - (X) == kDNSFlag0_OP_StdQuery ? "" : \ - (X) == kDNSFlag0_OP_Iquery ? "Iquery " : \ - (X) == kDNSFlag0_OP_Status ? "Status " : \ - (X) == kDNSFlag0_OP_Unused3 ? "Unused3 " : \ - (X) == kDNSFlag0_OP_Notify ? "Notify " : \ - (X) == kDNSFlag0_OP_Update ? "Update " : "?? " ) - -#define DNS_RC_Name(X) ( \ - (X) == kDNSFlag1_RC_NoErr ? "NoErr" : \ - (X) == kDNSFlag1_RC_FormErr ? "FormErr" : \ - (X) == kDNSFlag1_RC_ServFail ? "ServFail" : \ - (X) == kDNSFlag1_RC_NXDomain ? "NXDomain" : \ - (X) == kDNSFlag1_RC_NotImpl ? "NotImpl" : \ - (X) == kDNSFlag1_RC_Refused ? "Refused" : \ - (X) == kDNSFlag1_RC_YXDomain ? "YXDomain" : \ - (X) == kDNSFlag1_RC_YXRRSet ? "YXRRSet" : \ - (X) == kDNSFlag1_RC_NXRRSet ? "NXRRSet" : \ - (X) == kDNSFlag1_RC_NotAuth ? "NotAuth" : \ - (X) == kDNSFlag1_RC_NotZone ? "NotZone" : "??" ) - -// Note: DumpPacket expects the packet header fields in host byte order, not network byte order -mDNSexport void DumpPacket(mDNS *const m, mStatus status, mDNSBool sent, char *transport, - const mDNSAddr *srcaddr, mDNSIPPort srcport, - const mDNSAddr *dstaddr, mDNSIPPort dstport, const DNSMessage *const msg, const mDNSu8 *const end) - { - mDNSBool IsUpdate = ((msg->h.flags.b[0] & kDNSFlag0_OP_Mask) == kDNSFlag0_OP_Update); - const mDNSu8 *ptr = msg->data; - int i; - DNSQuestion q; - char tbuffer[64], sbuffer[64], dbuffer[64] = ""; - if (!status) tbuffer[mDNS_snprintf(tbuffer, sizeof(tbuffer), sent ? "Sent" : "Received" )] = 0; - else tbuffer[mDNS_snprintf(tbuffer, sizeof(tbuffer), "ERROR %d %sing", status, sent ? "Send" : "Receiv")] = 0; - if (sent) sbuffer[mDNS_snprintf(sbuffer, sizeof(sbuffer), "port " )] = 0; - else sbuffer[mDNS_snprintf(sbuffer, sizeof(sbuffer), "%#a:", srcaddr)] = 0; - if (dstaddr || !mDNSIPPortIsZero(dstport)) - dbuffer[mDNS_snprintf(dbuffer, sizeof(dbuffer), " to %#a:%d", dstaddr, mDNSVal16(dstport))] = 0; - - LogMsg("-- %s %s DNS %s%s (flags %02X%02X) RCODE: %s (%d) %s%s%s%s%s%sID: %d %d bytes from %s%d%s%s --", - tbuffer, transport, - DNS_OP_Name(msg->h.flags.b[0] & kDNSFlag0_OP_Mask), - msg->h.flags.b[0] & kDNSFlag0_QR_Response ? "Response" : "Query", - msg->h.flags.b[0], msg->h.flags.b[1], - DNS_RC_Name(msg->h.flags.b[1] & kDNSFlag1_RC_Mask), - msg->h.flags.b[1] & kDNSFlag1_RC_Mask, - msg->h.flags.b[0] & kDNSFlag0_AA ? "AA " : "", - msg->h.flags.b[0] & kDNSFlag0_TC ? "TC " : "", - msg->h.flags.b[0] & kDNSFlag0_RD ? "RD " : "", - msg->h.flags.b[1] & kDNSFlag1_RA ? "RA " : "", - msg->h.flags.b[1] & kDNSFlag1_AD ? "AD " : "", - msg->h.flags.b[1] & kDNSFlag1_CD ? "CD " : "", - mDNSVal16(msg->h.id), - end - msg->data, - sbuffer, mDNSVal16(srcport), dbuffer, - (msg->h.flags.b[0] & kDNSFlag0_TC) ? " (truncated)" : "" - ); - - LogMsg("%2d %s", msg->h.numQuestions, IsUpdate ? "Zone" : "Questions"); - for (i = 0; i < msg->h.numQuestions && ptr; i++) - { - ptr = getQuestion(msg, ptr, end, mDNSInterface_Any, &q); - if (ptr) LogMsg("%2d %##s %s", i, q.qname.c, DNSTypeName(q.qtype)); - } - ptr = DumpRecords(m, msg, ptr, end, msg->h.numAnswers, IsUpdate ? "Prerequisites" : "Answers"); - ptr = DumpRecords(m, msg, ptr, end, msg->h.numAuthorities, IsUpdate ? "Updates" : "Authorities"); - ptr = DumpRecords(m, msg, ptr, end, msg->h.numAdditionals, "Additionals"); - LogMsg("--------------"); - } - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - Packet Sending Functions -#endif - -// Stub definition of TCPSocket_struct so we can access flags field. (Rest of TCPSocket_struct is platform-dependent.) -struct TCPSocket_struct { TCPSocketFlags flags; /* ... */ }; - -struct UDPSocket_struct - { - mDNSIPPort port; // MUST BE FIRST FIELD -- mDNSCoreReceive expects every UDPSocket_struct to begin with mDNSIPPort port - }; - -// Note: When we sign a DNS message using DNSDigest_SignMessage(), the current real-time clock value is used, which -// is why we generally defer signing until we send the message, to ensure the signature is as fresh as possible. -mDNSexport mStatus mDNSSendDNSMessage(mDNS *const m, DNSMessage *const msg, mDNSu8 *end, - mDNSInterfaceID InterfaceID, UDPSocket *src, const mDNSAddr *dst, mDNSIPPort dstport, TCPSocket *sock, DomainAuthInfo *authInfo) - { - mStatus status = mStatus_NoError; - const mDNSu16 numAdditionals = msg->h.numAdditionals; - mDNSu8 *newend; - mDNSu8 *limit = msg->data + AbsoluteMaxDNSMessageData; - - // Zero-length message data is okay (e.g. for a DNS Update ack, where all we need is an ID and an error code - if (end < msg->data || end - msg->data > AbsoluteMaxDNSMessageData) - { - LogMsg("mDNSSendDNSMessage: invalid message %p %p %d", msg->data, end, end - msg->data); - return mStatus_BadParamErr; - } - - newend = putHINFO(m, msg, end, authInfo, limit); - if (!newend) LogMsg("mDNSSendDNSMessage: putHINFO failed msg %p end %p, limit %p", msg->data, end, limit); // Not fatal - else end = newend; - - // Put all the integer values in IETF byte-order (MSB first, LSB second) - SwapDNSHeaderBytes(msg); - - if (authInfo) DNSDigest_SignMessage(msg, &end, authInfo, 0); // DNSDigest_SignMessage operates on message in network byte order - if (!end) { LogMsg("mDNSSendDNSMessage: DNSDigest_SignMessage failed"); status = mStatus_NoMemoryErr; } - else - { - // Send the packet on the wire - if (!sock) - status = mDNSPlatformSendUDP(m, msg, end, InterfaceID, src, dst, dstport); - else - { - mDNSu16 msglen = (mDNSu16)(end - (mDNSu8 *)msg); - mDNSu8 lenbuf[2] = { (mDNSu8)(msglen >> 8), (mDNSu8)(msglen & 0xFF) }; - long nsent = mDNSPlatformWriteTCP(sock, (char*)lenbuf, 2); // Should do scatter/gather here -- this is probably going out as two packets - if (nsent != 2) { LogMsg("mDNSSendDNSMessage: write msg length failed %d/%d", nsent, 2); status = mStatus_ConnFailed; } - else - { - nsent = mDNSPlatformWriteTCP(sock, (char *)msg, msglen); - if (nsent != msglen) { LogMsg("mDNSSendDNSMessage: write msg body failed %d/%d", nsent, msglen); status = mStatus_ConnFailed; } - } - } - } - - // Swap the integer values back the way they were (remember that numAdditionals may have been changed by putHINFO and/or SignMessage) - SwapDNSHeaderBytes(msg); - - // Dump the packet with the HINFO and TSIG - if (mDNS_PacketLoggingEnabled && !mDNSOpaque16IsZero(msg->h.id)) - DumpPacket(m, status, mDNStrue, sock && (sock->flags & kTCPSocketFlags_UseTLS) ? "TLS" : sock ? "TCP" : "UDP", mDNSNULL, src ? src->port : MulticastDNSPort, dst, dstport, msg, end); - - // put the number of additionals back the way it was - msg->h.numAdditionals = numAdditionals; - - return(status); - } - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - RR List Management & Task Management -#endif - -mDNSexport void mDNS_Lock_(mDNS *const m, const char * const functionname) - { - // MUST grab the platform lock FIRST! - mDNSPlatformLock(m); - - // Normally, mDNS_reentrancy is zero and so is mDNS_busy - // However, when we call a client callback mDNS_busy is one, and we increment mDNS_reentrancy too - // If that client callback does mDNS API calls, mDNS_reentrancy and mDNS_busy will both be one - // If mDNS_busy != mDNS_reentrancy that's a bad sign - if (m->mDNS_busy != m->mDNS_reentrancy) - { - LogMsg("%s: mDNS_Lock: Locking failure! mDNS_busy (%ld) != mDNS_reentrancy (%ld)", functionname, m->mDNS_busy, m->mDNS_reentrancy); -#if ForceAlerts - *(long*)0 = 0; -#endif - } - - // If this is an initial entry into the mDNSCore code, set m->timenow - // else, if this is a re-entrant entry into the mDNSCore code, m->timenow should already be set - if (m->mDNS_busy == 0) - { - if (m->timenow) - LogMsg("%s: mDNS_Lock: m->timenow already set (%ld/%ld)", functionname, m->timenow, mDNS_TimeNow_NoLock(m)); - m->timenow = mDNS_TimeNow_NoLock(m); - if (m->timenow == 0) m->timenow = 1; - } - else if (m->timenow == 0) - { - LogMsg("%s: mDNS_Lock: m->mDNS_busy is %ld but m->timenow not set", functionname, m->mDNS_busy); - m->timenow = mDNS_TimeNow_NoLock(m); - if (m->timenow == 0) m->timenow = 1; - } - - if (m->timenow_last - m->timenow > 0) - { - m->timenow_adjust += m->timenow_last - m->timenow; - LogMsg("%s: mDNSPlatformRawTime went backwards by %ld ticks; setting correction factor to %ld", functionname, m->timenow_last - m->timenow, m->timenow_adjust); - m->timenow = m->timenow_last; - } - m->timenow_last = m->timenow; - - // Increment mDNS_busy so we'll recognise re-entrant calls - m->mDNS_busy++; - } - -mDNSlocal AuthRecord *AnyLocalRecordReady(const mDNS *const m) - { - AuthRecord *rr; - for (rr = m->NewLocalRecords; rr; rr = rr->next) - if (LocalRecordReady(rr)) return rr; - return mDNSNULL; - } - -mDNSlocal mDNSs32 GetNextScheduledEvent(const mDNS *const m) - { - mDNSs32 e = m->timenow + 0x78000000; - if (m->mDNSPlatformStatus != mStatus_NoError) return(e); - if (m->NewQuestions) - { - if (m->NewQuestions->DelayAnswering) e = m->NewQuestions->DelayAnswering; - else return(m->timenow); - } - if (m->NewLocalOnlyQuestions) return(m->timenow); - if (m->NewLocalRecords && AnyLocalRecordReady(m)) return(m->timenow); - if (m->NewLocalOnlyRecords) return(m->timenow); - if (m->SPSProxyListChanged) return(m->timenow); - if (m->LocalRemoveEvents) return(m->timenow); - -#ifndef UNICAST_DISABLED - if (e - m->NextuDNSEvent > 0) e = m->NextuDNSEvent; - if (e - m->NextScheduledNATOp > 0) e = m->NextScheduledNATOp; - if (m->NextSRVUpdate && e - m->NextSRVUpdate > 0) e = m->NextSRVUpdate; -#endif - - if (e - m->NextCacheCheck > 0) e = m->NextCacheCheck; - if (e - m->NextScheduledSPS > 0) e = m->NextScheduledSPS; - // NextScheduledSPRetry only valid when DelaySleep not set - if (!m->DelaySleep && m->SleepLimit && e - m->NextScheduledSPRetry > 0) e = m->NextScheduledSPRetry; - if (m->DelaySleep && e - m->DelaySleep > 0) e = m->DelaySleep; - - if (m->SuppressSending) - { - if (e - m->SuppressSending > 0) e = m->SuppressSending; - } - else - { - if (e - m->NextScheduledQuery > 0) e = m->NextScheduledQuery; - if (e - m->NextScheduledProbe > 0) e = m->NextScheduledProbe; - if (e - m->NextScheduledResponse > 0) e = m->NextScheduledResponse; - } - if (e - m->NextScheduledStopTime > 0) e = m->NextScheduledStopTime; - return(e); - } - -mDNSexport void ShowTaskSchedulingError(mDNS *const m) - { - AuthRecord *rr; - mDNS_Lock(m); - - LogMsg("Task Scheduling Error: Continuously busy for more than a second"); - - // Note: To accurately diagnose *why* we're busy, the debugging code here needs to mirror the logic in GetNextScheduledEvent above - - if (m->NewQuestions && (!m->NewQuestions->DelayAnswering || m->timenow - m->NewQuestions->DelayAnswering >= 0)) - LogMsg("Task Scheduling Error: NewQuestion %##s (%s)", - m->NewQuestions->qname.c, DNSTypeName(m->NewQuestions->qtype)); - - if (m->NewLocalOnlyQuestions) - LogMsg("Task Scheduling Error: NewLocalOnlyQuestions %##s (%s)", - m->NewLocalOnlyQuestions->qname.c, DNSTypeName(m->NewLocalOnlyQuestions->qtype)); - - if (m->NewLocalRecords) - { - rr = AnyLocalRecordReady(m); - if (rr) LogMsg("Task Scheduling Error: NewLocalRecords %s", ARDisplayString(m, rr)); - } - - if (m->NewLocalOnlyRecords) LogMsg("Task Scheduling Error: NewLocalOnlyRecords"); - - if (m->SPSProxyListChanged) LogMsg("Task Scheduling Error: SPSProxyListChanged"); - if (m->LocalRemoveEvents) LogMsg("Task Scheduling Error: LocalRemoveEvents"); - - if (m->timenow - m->NextScheduledEvent >= 0) - LogMsg("Task Scheduling Error: m->NextScheduledEvent %d", m->timenow - m->NextScheduledEvent); - -#ifndef UNICAST_DISABLED - if (m->timenow - m->NextuDNSEvent >= 0) - LogMsg("Task Scheduling Error: m->NextuDNSEvent %d", m->timenow - m->NextuDNSEvent); - if (m->timenow - m->NextScheduledNATOp >= 0) - LogMsg("Task Scheduling Error: m->NextScheduledNATOp %d", m->timenow - m->NextScheduledNATOp); - if (m->NextSRVUpdate && m->timenow - m->NextSRVUpdate >= 0) - LogMsg("Task Scheduling Error: m->NextSRVUpdate %d", m->timenow - m->NextSRVUpdate); -#endif - - if (m->timenow - m->NextCacheCheck >= 0) - LogMsg("Task Scheduling Error: m->NextCacheCheck %d", m->timenow - m->NextCacheCheck); - if (m->timenow - m->NextScheduledSPS >= 0) - LogMsg("Task Scheduling Error: m->NextScheduledSPS %d", m->timenow - m->NextScheduledSPS); - if (!m->DelaySleep && m->SleepLimit && m->timenow - m->NextScheduledSPRetry >= 0) - LogMsg("Task Scheduling Error: m->NextScheduledSPRetry %d", m->timenow - m->NextScheduledSPRetry); - if (m->DelaySleep && m->timenow - m->DelaySleep >= 0) - LogMsg("Task Scheduling Error: m->DelaySleep %d", m->timenow - m->DelaySleep); - - if (m->SuppressSending && m->timenow - m->SuppressSending >= 0) - LogMsg("Task Scheduling Error: m->SuppressSending %d", m->timenow - m->SuppressSending); - if (m->timenow - m->NextScheduledQuery >= 0) - LogMsg("Task Scheduling Error: m->NextScheduledQuery %d", m->timenow - m->NextScheduledQuery); - if (m->timenow - m->NextScheduledProbe >= 0) - LogMsg("Task Scheduling Error: m->NextScheduledProbe %d", m->timenow - m->NextScheduledProbe); - if (m->timenow - m->NextScheduledResponse >= 0) - LogMsg("Task Scheduling Error: m->NextScheduledResponse %d", m->timenow - m->NextScheduledResponse); - - mDNS_Unlock(m); - } - -mDNSexport void mDNS_Unlock_(mDNS *const m, const char * const functionname) - { - // Decrement mDNS_busy - m->mDNS_busy--; - - // Check for locking failures - if (m->mDNS_busy != m->mDNS_reentrancy) - { - LogMsg("%s: mDNS_Unlock: Locking failure! mDNS_busy (%ld) != mDNS_reentrancy (%ld)", functionname, m->mDNS_busy, m->mDNS_reentrancy); -#if ForceAlerts - *(long*)0 = 0; -#endif - } - - // If this is a final exit from the mDNSCore code, set m->NextScheduledEvent and clear m->timenow - if (m->mDNS_busy == 0) - { - m->NextScheduledEvent = GetNextScheduledEvent(m); - if (m->timenow == 0) LogMsg("%s: mDNS_Unlock: ERROR! m->timenow aready zero", functionname); - m->timenow = 0; - } - - // MUST release the platform lock LAST! - mDNSPlatformUnlock(m); - } - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - Specialized mDNS version of vsnprintf -#endif - -static const struct mDNSprintf_format - { - unsigned leftJustify : 1; - unsigned forceSign : 1; - unsigned zeroPad : 1; - unsigned havePrecision : 1; - unsigned hSize : 1; - unsigned lSize : 1; - char altForm; - char sign; // +, - or space - unsigned int fieldWidth; - unsigned int precision; - } mDNSprintf_format_default = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; - -mDNSexport mDNSu32 mDNS_vsnprintf(char *sbuffer, mDNSu32 buflen, const char *fmt, va_list arg) - { - mDNSu32 nwritten = 0; - int c; - if (buflen == 0) return(0); - buflen--; // Pre-reserve one space in the buffer for the terminating null - if (buflen == 0) goto exit; - - for (c = *fmt; c != 0; c = *++fmt) - { - if (c != '%') - { - *sbuffer++ = (char)c; - if (++nwritten >= buflen) goto exit; - } - else - { - unsigned int i=0, j; - // The mDNS Vsprintf Argument Conversion Buffer is used as a temporary holding area for - // generating decimal numbers, hexdecimal numbers, IP addresses, domain name strings, etc. - // The size needs to be enough for a 256-byte domain name plus some error text. - #define mDNS_VACB_Size 300 - char mDNS_VACB[mDNS_VACB_Size]; - #define mDNS_VACB_Lim (&mDNS_VACB[mDNS_VACB_Size]) - #define mDNS_VACB_Remain(s) ((mDNSu32)(mDNS_VACB_Lim - s)) - char *s = mDNS_VACB_Lim, *digits; - struct mDNSprintf_format F = mDNSprintf_format_default; - - while (1) // decode flags - { - c = *++fmt; - if (c == '-') F.leftJustify = 1; - else if (c == '+') F.forceSign = 1; - else if (c == ' ') F.sign = ' '; - else if (c == '#') F.altForm++; - else if (c == '0') F.zeroPad = 1; - else break; - } - - if (c == '*') // decode field width - { - int f = va_arg(arg, int); - if (f < 0) { f = -f; F.leftJustify = 1; } - F.fieldWidth = (unsigned int)f; - c = *++fmt; - } - else - { - for (; c >= '0' && c <= '9'; c = *++fmt) - F.fieldWidth = (10 * F.fieldWidth) + (c - '0'); - } - - if (c == '.') // decode precision - { - if ((c = *++fmt) == '*') - { F.precision = va_arg(arg, unsigned int); c = *++fmt; } - else for (; c >= '0' && c <= '9'; c = *++fmt) - F.precision = (10 * F.precision) + (c - '0'); - F.havePrecision = 1; - } - - if (F.leftJustify) F.zeroPad = 0; - - conv: - switch (c) // perform appropriate conversion - { - unsigned long n; - case 'h' : F.hSize = 1; c = *++fmt; goto conv; - case 'l' : // fall through - case 'L' : F.lSize = 1; c = *++fmt; goto conv; - case 'd' : - case 'i' : if (F.lSize) n = (unsigned long)va_arg(arg, long); - else n = (unsigned long)va_arg(arg, int); - if (F.hSize) n = (short) n; - if ((long) n < 0) { n = (unsigned long)-(long)n; F.sign = '-'; } - else if (F.forceSign) F.sign = '+'; - goto decimal; - case 'u' : if (F.lSize) n = va_arg(arg, unsigned long); - else n = va_arg(arg, unsigned int); - if (F.hSize) n = (unsigned short) n; - F.sign = 0; - goto decimal; - decimal: if (!F.havePrecision) - { - if (F.zeroPad) - { - F.precision = F.fieldWidth; - if (F.sign) --F.precision; - } - if (F.precision < 1) F.precision = 1; - } - if (F.precision > mDNS_VACB_Size - 1) - F.precision = mDNS_VACB_Size - 1; - for (i = 0; n; n /= 10, i++) *--s = (char)(n % 10 + '0'); - for (; i < F.precision; i++) *--s = '0'; - if (F.sign) { *--s = F.sign; i++; } - break; - - case 'o' : if (F.lSize) n = va_arg(arg, unsigned long); - else n = va_arg(arg, unsigned int); - if (F.hSize) n = (unsigned short) n; - if (!F.havePrecision) - { - if (F.zeroPad) F.precision = F.fieldWidth; - if (F.precision < 1) F.precision = 1; - } - if (F.precision > mDNS_VACB_Size - 1) - F.precision = mDNS_VACB_Size - 1; - for (i = 0; n; n /= 8, i++) *--s = (char)(n % 8 + '0'); - if (F.altForm && i && *s != '0') { *--s = '0'; i++; } - for (; i < F.precision; i++) *--s = '0'; - break; - - case 'a' : { - unsigned char *a = va_arg(arg, unsigned char *); - if (!a) { static char emsg[] = "<>"; s = emsg; i = sizeof(emsg)-1; } - else - { - s = mDNS_VACB; // Adjust s to point to the start of the buffer, not the end - if (F.altForm) - { - mDNSAddr *ip = (mDNSAddr*)a; - switch (ip->type) - { - case mDNSAddrType_IPv4: F.precision = 4; a = (unsigned char *)&ip->ip.v4; break; - case mDNSAddrType_IPv6: F.precision = 16; a = (unsigned char *)&ip->ip.v6; break; - default: F.precision = 0; break; - } - } - if (F.altForm && !F.precision) - i = mDNS_snprintf(mDNS_VACB, sizeof(mDNS_VACB), ""); - else switch (F.precision) - { - case 4: i = mDNS_snprintf(mDNS_VACB, sizeof(mDNS_VACB), "%d.%d.%d.%d", - a[0], a[1], a[2], a[3]); break; - case 6: i = mDNS_snprintf(mDNS_VACB, sizeof(mDNS_VACB), "%02X:%02X:%02X:%02X:%02X:%02X", - a[0], a[1], a[2], a[3], a[4], a[5]); break; - case 16: i = mDNS_snprintf(mDNS_VACB, sizeof(mDNS_VACB), - "%02X%02X:%02X%02X:%02X%02X:%02X%02X:%02X%02X:%02X%02X:%02X%02X:%02X%02X", - a[0x0], a[0x1], a[0x2], a[0x3], a[0x4], a[0x5], a[0x6], a[0x7], - a[0x8], a[0x9], a[0xA], a[0xB], a[0xC], a[0xD], a[0xE], a[0xF]); break; - default: i = mDNS_snprintf(mDNS_VACB, sizeof(mDNS_VACB), "%s", "<< ERROR: Must specify" - " address size (i.e. %.4a=IPv4, %.6a=Ethernet, %.16a=IPv6) >>"); break; - } - } - } - break; - - case 'p' : F.havePrecision = F.lSize = 1; - F.precision = sizeof(void*) * 2; // 8 characters on 32-bit; 16 characters on 64-bit - case 'X' : digits = "0123456789ABCDEF"; - goto hexadecimal; - case 'x' : digits = "0123456789abcdef"; - hexadecimal:if (F.lSize) n = va_arg(arg, unsigned long); - else n = va_arg(arg, unsigned int); - if (F.hSize) n = (unsigned short) n; - if (!F.havePrecision) - { - if (F.zeroPad) - { - F.precision = F.fieldWidth; - if (F.altForm) F.precision -= 2; - } - if (F.precision < 1) F.precision = 1; - } - if (F.precision > mDNS_VACB_Size - 1) - F.precision = mDNS_VACB_Size - 1; - for (i = 0; n; n /= 16, i++) *--s = digits[n % 16]; - for (; i < F.precision; i++) *--s = '0'; - if (F.altForm) { *--s = (char)c; *--s = '0'; i += 2; } - break; - - case 'c' : *--s = (char)va_arg(arg, int); i = 1; break; - - case 's' : s = va_arg(arg, char *); - if (!s) { static char emsg[] = "<>"; s = emsg; i = sizeof(emsg)-1; } - else switch (F.altForm) - { - case 0: i=0; - if (!F.havePrecision) // C string - while (s[i]) i++; - else - { - while ((i < F.precision) && s[i]) i++; - // Make sure we don't truncate in the middle of a UTF-8 character - // If last character we got was any kind of UTF-8 multi-byte character, - // then see if we have to back up. - // This is not as easy as the similar checks below, because - // here we can't assume it's safe to examine the *next* byte, so we - // have to confine ourselves to working only backwards in the string. - j = i; // Record where we got to - // Now, back up until we find first non-continuation-char - while (i>0 && (s[i-1] & 0xC0) == 0x80) i--; - // Now s[i-1] is the first non-continuation-char - // and (j-i) is the number of continuation-chars we found - if (i>0 && (s[i-1] & 0xC0) == 0xC0) // If we found a start-char - { - i--; // Tentatively eliminate this start-char as well - // Now (j-i) is the number of characters we're considering eliminating. - // To be legal UTF-8, the start-char must contain (j-i) one-bits, - // followed by a zero bit. If we shift it right by (7-(j-i)) bits - // (with sign extension) then the result has to be 0xFE. - // If this is right, then we reinstate the tentatively eliminated bytes. - if (((j-i) < 7) && (((s[i] >> (7-(j-i))) & 0xFF) == 0xFE)) i = j; - } - } - break; - case 1: i = (unsigned char) *s++; break; // Pascal string - case 2: { // DNS label-sequence name - unsigned char *a = (unsigned char *)s; - s = mDNS_VACB; // Adjust s to point to the start of the buffer, not the end - if (*a == 0) *s++ = '.'; // Special case for root DNS name - while (*a) - { - char buf[63*4+1]; - if (*a > 63) - { s += mDNS_snprintf(s, mDNS_VACB_Remain(s), "<>", *a); break; } - if (s + *a >= &mDNS_VACB[254]) - { s += mDNS_snprintf(s, mDNS_VACB_Remain(s), "<>"); break; } - // Need to use ConvertDomainLabelToCString to do proper escaping here, - // so it's clear what's a literal dot and what's a label separator - ConvertDomainLabelToCString((domainlabel*)a, buf); - s += mDNS_snprintf(s, mDNS_VACB_Remain(s), "%s.", buf); - a += 1 + *a; - } - i = (mDNSu32)(s - mDNS_VACB); - s = mDNS_VACB; // Reset s back to the start of the buffer - break; - } - } - // Make sure we don't truncate in the middle of a UTF-8 character (see similar comment below) - if (F.havePrecision && i > F.precision) - { i = F.precision; while (i>0 && (s[i] & 0xC0) == 0x80) i--; } - break; - - case 'n' : s = va_arg(arg, char *); - if (F.hSize) * (short *) s = (short)nwritten; - else if (F.lSize) * (long *) s = (long)nwritten; - else * (int *) s = (int)nwritten; - continue; - - default: s = mDNS_VACB; - i = mDNS_snprintf(mDNS_VACB, sizeof(mDNS_VACB), "<>", c); - - case '%' : *sbuffer++ = (char)c; - if (++nwritten >= buflen) goto exit; - break; - } - - if (i < F.fieldWidth && !F.leftJustify) // Pad on the left - do { - *sbuffer++ = ' '; - if (++nwritten >= buflen) goto exit; - } while (i < --F.fieldWidth); - - // Make sure we don't truncate in the middle of a UTF-8 character. - // Note: s[i] is the first eliminated character; i.e. the next character *after* the last character of the - // allowed output. If s[i] is a UTF-8 continuation character, then we've cut a unicode character in half, - // so back up 'i' until s[i] is no longer a UTF-8 continuation character. (if the input was proprly - // formed, s[i] will now be the UTF-8 start character of the multi-byte character we just eliminated). - if (i > buflen - nwritten) - { i = buflen - nwritten; while (i>0 && (s[i] & 0xC0) == 0x80) i--; } - for (j=0; j= buflen) goto exit; - - for (; i < F.fieldWidth; i++) // Pad on the right - { - *sbuffer++ = ' '; - if (++nwritten >= buflen) goto exit; - } - } - } - exit: - *sbuffer++ = 0; - return(nwritten); - } - -mDNSexport mDNSu32 mDNS_snprintf(char *sbuffer, mDNSu32 buflen, const char *fmt, ...) - { - mDNSu32 length; - - va_list ptr; - va_start(ptr,fmt); - length = mDNS_vsnprintf(sbuffer, buflen, fmt, ptr); - va_end(ptr); - - return(length); - } diff --git a/src/tools/mdnssd/DNSCommon.h b/src/tools/mdnssd/DNSCommon.h deleted file mode 100644 index 5df4ce410d..0000000000 --- a/src/tools/mdnssd/DNSCommon.h +++ /dev/null @@ -1,292 +0,0 @@ -/* -*- Mode: C; tab-width: 4 -*- - * - * Copyright (c) 2002-2003 Apple Computer, Inc. All rights reserved. - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -#ifndef __DNSCOMMON_H_ -#define __DNSCOMMON_H_ - -#include "mDNSEmbeddedAPI.h" - -#ifdef __cplusplus - extern "C" { -#endif - -//************************************************************************************************************* -// Macros - -// Note: The C preprocessor stringify operator ('#') makes a string from its argument, without macro expansion -// e.g. If "version" is #define'd to be "4", then STRINGIFY_AWE(version) will return the string "version", not "4" -// To expand "version" to its value before making the string, use STRINGIFY(version) instead -#define STRINGIFY_ARGUMENT_WITHOUT_EXPANSION(s) #s -#define STRINGIFY(s) STRINGIFY_ARGUMENT_WITHOUT_EXPANSION(s) - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - DNS Protocol Constants -#endif - -typedef enum - { - kDNSFlag0_QR_Mask = 0x80, // Query or response? - kDNSFlag0_QR_Query = 0x00, - kDNSFlag0_QR_Response = 0x80, - - kDNSFlag0_OP_Mask = 0x78, // Operation type - kDNSFlag0_OP_StdQuery = 0x00, - kDNSFlag0_OP_Iquery = 0x08, - kDNSFlag0_OP_Status = 0x10, - kDNSFlag0_OP_Unused3 = 0x18, - kDNSFlag0_OP_Notify = 0x20, - kDNSFlag0_OP_Update = 0x28, - - kDNSFlag0_QROP_Mask = kDNSFlag0_QR_Mask | kDNSFlag0_OP_Mask, - - kDNSFlag0_AA = 0x04, // Authoritative Answer? - kDNSFlag0_TC = 0x02, // Truncated? - kDNSFlag0_RD = 0x01, // Recursion Desired? - kDNSFlag1_RA = 0x80, // Recursion Available? - - kDNSFlag1_Zero = 0x40, // Reserved; must be zero - kDNSFlag1_AD = 0x20, // Authentic Data [RFC 2535] - kDNSFlag1_CD = 0x10, // Checking Disabled [RFC 2535] - - kDNSFlag1_RC_Mask = 0x0F, // Response code - kDNSFlag1_RC_NoErr = 0x00, - kDNSFlag1_RC_FormErr = 0x01, - kDNSFlag1_RC_ServFail = 0x02, - kDNSFlag1_RC_NXDomain = 0x03, - kDNSFlag1_RC_NotImpl = 0x04, - kDNSFlag1_RC_Refused = 0x05, - kDNSFlag1_RC_YXDomain = 0x06, - kDNSFlag1_RC_YXRRSet = 0x07, - kDNSFlag1_RC_NXRRSet = 0x08, - kDNSFlag1_RC_NotAuth = 0x09, - kDNSFlag1_RC_NotZone = 0x0A - } DNS_Flags; - -typedef enum - { - TSIG_ErrBadSig = 16, - TSIG_ErrBadKey = 17, - TSIG_ErrBadTime = 18 - } TSIG_ErrorCode; - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - General Utility Functions -#endif - -extern NetworkInterfaceInfo *GetFirstActiveInterface(NetworkInterfaceInfo *intf); -extern mDNSInterfaceID GetNextActiveInterfaceID(const NetworkInterfaceInfo *intf); - -extern mDNSu32 mDNSRandom(mDNSu32 max); // Returns pseudo-random result from zero to max inclusive - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - Domain Name Utility Functions -#endif - -#define mDNSIsDigit(X) ((X) >= '0' && (X) <= '9') -#define mDNSIsUpperCase(X) ((X) >= 'A' && (X) <= 'Z') -#define mDNSIsLowerCase(X) ((X) >= 'a' && (X) <= 'z') -#define mDNSIsLetter(X) (mDNSIsUpperCase(X) || mDNSIsLowerCase(X)) - -#define mDNSValidHostChar(X, notfirst, notlast) (mDNSIsLetter(X) || mDNSIsDigit(X) || ((notfirst) && (notlast) && (X) == '-') ) - -extern mDNSu16 CompressedDomainNameLength(const domainname *const name, const domainname *parent); -extern int CountLabels(const domainname *d); -extern const domainname *SkipLeadingLabels(const domainname *d, int skip); - -extern mDNSu32 TruncateUTF8ToLength(mDNSu8 *string, mDNSu32 length, mDNSu32 max); -extern mDNSBool LabelContainsSuffix(const domainlabel *const name, const mDNSBool RichText); -extern mDNSu32 RemoveLabelSuffix(domainlabel *name, mDNSBool RichText); -extern void AppendLabelSuffix(domainlabel *const name, mDNSu32 val, const mDNSBool RichText); -#define ValidateDomainName(N) (DomainNameLength(N) <= MAX_DOMAIN_NAME) - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - Resource Record Utility Functions -#endif - -// IdenticalResourceRecord returns true if two resources records have -// the same name, type, class, and identical rdata (InterfaceID and TTL may differ) - -// IdenticalSameNameRecord is the same, except it skips the expensive SameDomainName() check, -// which is at its most expensive and least useful in cases where we know in advance that the names match - -// Note: The dominant use of IdenticalResourceRecord is from ProcessQuery(), handling known-answer lists. In this case -// it's common to have a whole bunch or records with exactly the same name (e.g. "_http._tcp.local") but different RDATA. -// The SameDomainName() check is expensive when the names match, and in this case *all* the names match, so we -// used to waste a lot of CPU time verifying that the names match, only then to find that the RDATA is different. -// We observed mDNSResponder spending 30% of its total CPU time on this single task alone. -// By swapping the checks so that we check the RDATA first, we can quickly detect when it's different -// (99% of the time) and then bail out before we waste time on the expensive SameDomainName() check. - -#define IdenticalResourceRecord(r1,r2) ( \ - (r1)->rrtype == (r2)->rrtype && \ - (r1)->rrclass == (r2)->rrclass && \ - (r1)->namehash == (r2)->namehash && \ - (r1)->rdlength == (r2)->rdlength && \ - (r1)->rdatahash == (r2)->rdatahash && \ - SameRDataBody((r1), &(r2)->rdata->u, SameDomainName) && \ - SameDomainName((r1)->name, (r2)->name)) - -#define IdenticalSameNameRecord(r1,r2) ( \ - (r1)->rrtype == (r2)->rrtype && \ - (r1)->rrclass == (r2)->rrclass && \ - (r1)->rdlength == (r2)->rdlength && \ - (r1)->rdatahash == (r2)->rdatahash && \ - SameRDataBody((r1), &(r2)->rdata->u, SameDomainName)) - -// A given RRType answers a QuestionType if RRType is CNAME, or types match, or QuestionType is ANY, -// or the RRType is NSEC and positively asserts the nonexistence of the type being requested -#define RRTypeAnswersQuestionType(R,Q) ((R)->rrtype == kDNSType_CNAME || (R)->rrtype == (Q) || (Q) == kDNSQType_ANY || RRAssertsNonexistence((R),(Q))) -#define RRAssertsNonexistence(R,T) ((R)->rrtype == kDNSType_NSEC && (T) < kDNSQType_ANY && !((R)->rdata->u.nsec.bitmap[(T)>>3] & (128 >> ((T)&7)))) - -extern mDNSu32 RDataHashValue(const ResourceRecord *const rr); -extern mDNSBool SameRDataBody(const ResourceRecord *const r1, const RDataBody *const r2, DomainNameComparisonFn *samename); -extern mDNSBool SameNameRecordAnswersQuestion(const ResourceRecord *const rr, const DNSQuestion *const q); -extern mDNSBool ResourceRecordAnswersQuestion(const ResourceRecord *const rr, const DNSQuestion *const q); -extern mDNSBool AnyTypeRecordAnswersQuestion (const ResourceRecord *const rr, const DNSQuestion *const q); -extern mDNSBool ResourceRecordAnswersUnicastResponse(const ResourceRecord *const rr, const DNSQuestion *const q); -extern mDNSBool LocalOnlyRecordAnswersQuestion(AuthRecord *const rr, const DNSQuestion *const q); -extern mDNSu16 GetRDLength(const ResourceRecord *const rr, mDNSBool estimate); -extern mDNSBool ValidateRData(const mDNSu16 rrtype, const mDNSu16 rdlength, const RData *const rd); - -#define GetRRDomainNameTarget(RR) ( \ - ((RR)->rrtype == kDNSType_NS || (RR)->rrtype == kDNSType_CNAME || (RR)->rrtype == kDNSType_PTR || (RR)->rrtype == kDNSType_DNAME) ? &(RR)->rdata->u.name : \ - ((RR)->rrtype == kDNSType_MX || (RR)->rrtype == kDNSType_AFSDB || (RR)->rrtype == kDNSType_RT || (RR)->rrtype == kDNSType_KX ) ? &(RR)->rdata->u.mx.exchange : \ - ((RR)->rrtype == kDNSType_SRV ) ? &(RR)->rdata->u.srv.target : mDNSNULL ) - -#define LocalRecordReady(X) ((X)->resrec.RecordType != kDNSRecordTypeUnique) - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - DNS Message Creation Functions -#endif - -extern void InitializeDNSMessage(DNSMessageHeader *h, mDNSOpaque16 id, mDNSOpaque16 flags); -extern const mDNSu8 *FindCompressionPointer(const mDNSu8 *const base, const mDNSu8 *const end, const mDNSu8 *const domname); -extern mDNSu8 *putDomainNameAsLabels(const DNSMessage *const msg, mDNSu8 *ptr, const mDNSu8 *const limit, const domainname *const name); -extern mDNSu8 *putRData(const DNSMessage *const msg, mDNSu8 *ptr, const mDNSu8 *const limit, const ResourceRecord *const rr); - -// If we have a single large record to put in the packet, then we allow the packet to be up to 9K bytes, -// but in the normal case we try to keep the packets below 1500 to avoid IP fragmentation on standard Ethernet - -#define AllowedRRSpace(msg) (((msg)->h.numAnswers || (msg)->h.numAuthorities || (msg)->h.numAdditionals) ? NormalMaxDNSMessageData : AbsoluteMaxDNSMessageData) - -extern mDNSu8 *PutResourceRecordTTLWithLimit(DNSMessage *const msg, mDNSu8 *ptr, mDNSu16 *count, ResourceRecord *rr, mDNSu32 ttl, const mDNSu8 *limit); - -#define PutResourceRecordTTL(msg, ptr, count, rr, ttl) \ - PutResourceRecordTTLWithLimit((msg), (ptr), (count), (rr), (ttl), (msg)->data + AllowedRRSpace(msg)) - -#define PutResourceRecordTTLJumbo(msg, ptr, count, rr, ttl) \ - PutResourceRecordTTLWithLimit((msg), (ptr), (count), (rr), (ttl), (msg)->data + AbsoluteMaxDNSMessageData) - -#define PutResourceRecord(MSG, P, C, RR) PutResourceRecordTTL((MSG), (P), (C), (RR), (RR)->rroriginalttl) - -// The PutRR_OS variants assume a local variable 'm', put build the packet at m->omsg, -// and assume a local variable 'OwnerRecordSpace' indicating how many bytes (if any) to reserve to add an OWNER option at the end -#define PutRR_OS_TTL(ptr, count, rr, ttl) \ - PutResourceRecordTTLWithLimit(&m->omsg, (ptr), (count), (rr), (ttl), m->omsg.data + AllowedRRSpace(&m->omsg) - OwnerRecordSpace) - -#define PutRR_OS(P, C, RR) PutRR_OS_TTL((P), (C), (RR), (RR)->rroriginalttl) - -extern mDNSu8 *putQuestion(DNSMessage *const msg, mDNSu8 *ptr, const mDNSu8 *const limit, const domainname *const name, mDNSu16 rrtype, mDNSu16 rrclass); -extern mDNSu8 *putZone(DNSMessage *const msg, mDNSu8 *ptr, mDNSu8 *limit, const domainname *zone, mDNSOpaque16 zoneClass); -extern mDNSu8 *putPrereqNameNotInUse(const domainname *const name, DNSMessage *const msg, mDNSu8 *const ptr, mDNSu8 *const end); -extern mDNSu8 *putDeletionRecord(DNSMessage *msg, mDNSu8 *ptr, ResourceRecord *rr); -extern mDNSu8 *putDeletionRecordWithLimit(DNSMessage *msg, mDNSu8 *ptr, ResourceRecord *rr, mDNSu8 *limit); -extern mDNSu8 *putDeleteRRSetWithLimit(DNSMessage *msg, mDNSu8 *ptr, const domainname *name, mDNSu16 rrtype, mDNSu8 *limit); -extern mDNSu8 *putDeleteAllRRSets(DNSMessage *msg, mDNSu8 *ptr, const domainname *name); -extern mDNSu8 *putUpdateLease(DNSMessage *msg, mDNSu8 *end, mDNSu32 lease); -extern mDNSu8 *putUpdateLeaseWithLimit(DNSMessage *msg, mDNSu8 *ptr, mDNSu32 lease, mDNSu8 *limit); - -extern mDNSu8 *putHINFO(const mDNS *const m, DNSMessage *const msg, mDNSu8 *ptr, DomainAuthInfo *authInfo, mDNSu8 *limit); - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - DNS Message Parsing Functions -#endif - -#define AuthHashSlot(X) (DomainNameHashValue(X) % AUTH_HASH_SLOTS) -#define HashSlot(X) (DomainNameHashValue(X) % CACHE_HASH_SLOTS) -extern mDNSu32 DomainNameHashValue(const domainname *const name); -extern void SetNewRData(ResourceRecord *const rr, RData *NewRData, mDNSu16 rdlength); -extern const mDNSu8 *skipDomainName(const DNSMessage *const msg, const mDNSu8 *ptr, const mDNSu8 *const end); -extern const mDNSu8 *getDomainName(const DNSMessage *const msg, const mDNSu8 *ptr, const mDNSu8 *const end, - domainname *const name); -extern const mDNSu8 *skipResourceRecord(const DNSMessage *msg, const mDNSu8 *ptr, const mDNSu8 *end); -extern const mDNSu8 *GetLargeResourceRecord(mDNS *const m, const DNSMessage * const msg, const mDNSu8 *ptr, - const mDNSu8 * end, const mDNSInterfaceID InterfaceID, mDNSu8 RecordType, LargeCacheRecord *const largecr); -extern const mDNSu8 *skipQuestion(const DNSMessage *msg, const mDNSu8 *ptr, const mDNSu8 *end); -extern const mDNSu8 *getQuestion(const DNSMessage *msg, const mDNSu8 *ptr, const mDNSu8 *end, const mDNSInterfaceID InterfaceID, - DNSQuestion *question); -extern const mDNSu8 *LocateAnswers(const DNSMessage *const msg, const mDNSu8 *const end); -extern const mDNSu8 *LocateAuthorities(const DNSMessage *const msg, const mDNSu8 *const end); -extern const mDNSu8 *LocateAdditionals(const DNSMessage *const msg, const mDNSu8 *const end); -extern const mDNSu8 *LocateOptRR(const DNSMessage *const msg, const mDNSu8 *const end, int minsize); -extern const rdataOPT *GetLLQOptData(mDNS *const m, const DNSMessage *const msg, const mDNSu8 *const end); -extern mDNSu32 GetPktLease(mDNS *m, DNSMessage *msg, const mDNSu8 *end); -extern void DumpPacket(mDNS *const m, mStatus status, mDNSBool sent, char *transport, - const mDNSAddr *srcaddr, mDNSIPPort srcport, - const mDNSAddr *dstaddr, mDNSIPPort dstport, const DNSMessage *const msg, const mDNSu8 *const end); - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - Packet Sending Functions -#endif - -extern mStatus mDNSSendDNSMessage(mDNS *const m, DNSMessage *const msg, mDNSu8 *end, - mDNSInterfaceID InterfaceID, UDPSocket *src, const mDNSAddr *dst, mDNSIPPort dstport, TCPSocket *sock, DomainAuthInfo *authInfo); - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - RR List Management & Task Management -#endif - -extern void ShowTaskSchedulingError(mDNS *const m); -extern void mDNS_Lock_(mDNS *const m, const char * const functionname); -extern void mDNS_Unlock_(mDNS *const m, const char * const functionname); - -#if defined(_WIN32) - #define __func__ __FUNCTION__ -#endif - -#define mDNS_Lock(X) mDNS_Lock_((X), __func__) - -#define mDNS_Unlock(X) mDNS_Unlock_((X), __func__) - -#define mDNS_DropLockBeforeCallback() do { m->mDNS_reentrancy++; \ - if (m->mDNS_busy != m->mDNS_reentrancy) LogMsg("%s: Locking Failure! mDNS_busy (%ld) != mDNS_reentrancy (%ld)", __func__, m->mDNS_busy, m->mDNS_reentrancy); \ - } while (0) - -#define mDNS_ReclaimLockAfterCallback() do { \ - if (m->mDNS_busy != m->mDNS_reentrancy) LogMsg("%s: Unlocking Failure! mDNS_busy (%ld) != mDNS_reentrancy (%ld)", __func__, m->mDNS_busy, m->mDNS_reentrancy); \ - m->mDNS_reentrancy--; } while (0) - -#ifdef __cplusplus - } -#endif - -#endif // __DNSCOMMON_H_ diff --git a/src/tools/mdnssd/DNSDigest.c b/src/tools/mdnssd/DNSDigest.c deleted file mode 100644 index 98d23dbdd1..0000000000 --- a/src/tools/mdnssd/DNSDigest.c +++ /dev/null @@ -1,1584 +0,0 @@ -/* -*- Mode: C; tab-width: 4 -*- - * - * Copyright (c) 2002-2011 Apple Computer, Inc. All rights reserved. - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - - -#ifdef __cplusplus -extern "C" { -#endif - -#include "mDNSEmbeddedAPI.h" -#include "DNSCommon.h" - -// Disable certain benign warnings with Microsoft compilers -#if(defined(_MSC_VER)) - // Disable "conditional expression is constant" warning for debug macros. - // Otherwise, this generates warnings for the perfectly natural construct "while(1)" - // If someone knows a variant way of writing "while(1)" that doesn't generate warning messages, please let us know - #pragma warning(disable:4127) -#endif - - - // *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - Byte Swapping Functions -#endif - -mDNSlocal mDNSu16 NToH16(mDNSu8 * bytes) - { - return (mDNSu16)((mDNSu16)bytes[0] << 8 | (mDNSu16)bytes[1]); - } - -mDNSlocal mDNSu32 NToH32(mDNSu8 * bytes) - { - return (mDNSu32)((mDNSu32) bytes[0] << 24 | (mDNSu32) bytes[1] << 16 | (mDNSu32) bytes[2] << 8 | (mDNSu32)bytes[3]); - } - - // *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - MD5 Hash Functions -#endif - - -/* The source for the has is derived CommonCrypto files CommonDigest.h, md32_common.h, md5_locl.h, md5_locl.h, and openssl/md5.h. - * The following changes have been made to the original sources: - * replaced CC_LONG w/ mDNSu32 - * replaced CC_MD5* with MD5* - * replaced CC_LONG w/ mDNSu32, removed conditional #defines from md5.h - * removed extern decls for MD5_Init/Update/Final from CommonDigest.h - * removed APPLE_COMMON_DIGEST specific #defines from md5_locl.h - * - * Note: machine archetecure specific conditionals from the original sources are turned off, but are left in the code - * to aid in platform-specific optimizations and debugging. - * Sources originally distributed under the following license headers: - * CommonDigest.h - APSL - * - * md32_Common.h - * ==================================================================== - * Copyright (c) 1999-2002 The OpenSSL Project. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in - * the documentation and/or other materials provided with the - * distribution. - * - * 3. All advertising materials mentioning features or use of this - * software must display the following acknowledgment: - * "This product includes software developed by the OpenSSL Project - * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" - * - * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to - * endorse or promote products derived from this software without - * prior written permission. For written permission, please contact - * licensing@OpenSSL.org. - * - * 5. Products derived from this software may not be called "OpenSSL" - * nor may "OpenSSL" appear in their names without prior written - * permission of the OpenSSL Project. - * - * 6. Redistributions of any form whatsoever must retain the following - * acknowledgment: - * "This product includes software developed by the OpenSSL Project - * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" - * - * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY - * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR - * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR - * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT - * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; - * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, - * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) - * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED - * OF THE POSSIBILITY OF SUCH DAMAGE. - * - * - * md5_dgst.c, md5_locl.h - * ==================================================================== - * - * This product includes cryptographic software written by Eric Young - * (eay@cryptsoft.com). This product includes software written by Tim - * Hudson (tjh@cryptsoft.com). - * - * Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) - * All rights reserved. - * - * This package is an SSL implementation written - * by Eric Young (eay@cryptsoft.com). - * The implementation was written so as to conform with Netscapes SSL. - * - * This library is free for commercial and non-commercial use as long as - * the following conditions are aheared to. The following conditions - * apply to all code found in this distribution, be it the RC4, RSA, - * lhash, DES, etc., code; not just the SSL code. The SSL documentation - * included with this distribution is covered by the same copyright terms - * except that the holder is Tim Hudson (tjh@cryptsoft.com). - * - * Copyright remains Eric Young's, and as such any Copyright notices in - * the code are not to be removed. - * If this package is used in a product, Eric Young should be given attribution - * as the author of the parts of the library used. - * This can be in the form of a textual message at program startup or - * in documentation (online or textual) provided with the package. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * "This product includes cryptographic software written by - * Eric Young (eay@cryptsoft.com)" - * The word 'cryptographic' can be left out if the rouines from the library - * being used are not cryptographic related :-). - * 4. If you include any Windows specific code (or a derivative thereof) from - * the apps directory (application code) you must include an acknowledgement: - * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" - * - * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - * The licence and distribution terms for any publically available version or - * derivative of this code cannot be changed. i.e. this code cannot simply be - * copied and put under another distribution licence - * [including the GNU Public Licence.] - * - */ - -//from CommonDigest.h - -#define MD5_DIGEST_LENGTH 16 /* digest length in bytes */ -#define MD5_BLOCK_BYTES 64 /* block size in bytes */ -#define MD5_BLOCK_LONG (MD5_BLOCK_BYTES / sizeof(mDNSu32)) - -typedef struct MD5state_st -{ - mDNSu32 A,B,C,D; - mDNSu32 Nl,Nh; - mDNSu32 data[MD5_BLOCK_LONG]; - int num; -} MD5_CTX; - - -// from openssl/md5.h - -#define MD5_CBLOCK 64 -#define MD5_LBLOCK (MD5_CBLOCK/4) -#define MD5_DIGEST_LENGTH 16 - -int MD5_Init(MD5_CTX *c); -int MD5_Update(MD5_CTX *c, const void *data, unsigned long len); -int MD5_Final(unsigned char *md, MD5_CTX *c); -void MD5_Transform(MD5_CTX *c, const unsigned char *b); - -// From md5_locl.h - -#ifndef MD5_LONG_LOG2 -#define MD5_LONG_LOG2 2 /* default to 32 bits */ -#endif - -#ifdef MD5_ASM -# if defined(__i386) || defined(__i386__) || defined(_M_IX86) || defined(__INTEL__) -# define md5_block_host_order md5_block_asm_host_order -# elif defined(__sparc) && defined(OPENSSL_SYS_ULTRASPARC) - void md5_block_asm_data_order_aligned (MD5_CTX *c, const mDNSu32 *p,int num); -# define HASH_BLOCK_DATA_ORDER_ALIGNED md5_block_asm_data_order_aligned -# endif -#endif - -void md5_block_host_order (MD5_CTX *c, const void *p,int num); -void md5_block_data_order (MD5_CTX *c, const void *p,int num); - -#if defined(__i386) || defined(__i386__) || defined(_M_IX86) || defined(__INTEL__) -/* - * *_block_host_order is expected to handle aligned data while - * *_block_data_order - unaligned. As algorithm and host (x86) - * are in this case of the same "endianness" these two are - * otherwise indistinguishable. But normally you don't want to - * call the same function because unaligned access in places - * where alignment is expected is usually a "Bad Thing". Indeed, - * on RISCs you get punished with BUS ERROR signal or *severe* - * performance degradation. Intel CPUs are in turn perfectly - * capable of loading unaligned data without such drastic side - * effect. Yes, they say it's slower than aligned load, but no - * exception is generated and therefore performance degradation - * is *incomparable* with RISCs. What we should weight here is - * costs of unaligned access against costs of aligning data. - * According to my measurements allowing unaligned access results - * in ~9% performance improvement on Pentium II operating at - * 266MHz. I won't be surprised if the difference will be higher - * on faster systems:-) - * - * - */ -#define md5_block_data_order md5_block_host_order -#endif - -#define DATA_ORDER_IS_LITTLE_ENDIAN - -#define HASH_LONG mDNSu32 -#define HASH_LONG_LOG2 MD5_LONG_LOG2 -#define HASH_CTX MD5_CTX -#define HASH_CBLOCK MD5_CBLOCK -#define HASH_LBLOCK MD5_LBLOCK - -#define HASH_UPDATE MD5_Update -#define HASH_TRANSFORM MD5_Transform -#define HASH_FINAL MD5_Final - -#define HASH_MAKE_STRING(c,s) do { \ - unsigned long ll; \ - ll=(c)->A; HOST_l2c(ll,(s)); \ - ll=(c)->B; HOST_l2c(ll,(s)); \ - ll=(c)->C; HOST_l2c(ll,(s)); \ - ll=(c)->D; HOST_l2c(ll,(s)); \ - } while (0) -#define HASH_BLOCK_HOST_ORDER md5_block_host_order -#if !defined(L_ENDIAN) || defined(md5_block_data_order) -#define HASH_BLOCK_DATA_ORDER md5_block_data_order -/* - * Little-endians (Intel and Alpha) feel better without this. - * It looks like memcpy does better job than generic - * md5_block_data_order on copying-n-aligning input data. - * But frankly speaking I didn't expect such result on Alpha. - * On the other hand I've got this with egcs-1.0.2 and if - * program is compiled with another (better?) compiler it - * might turn out other way around. - * - * - */ -#endif - - -// from md32_common.h - -/* - * This is a generic 32 bit "collector" for message digest algorithms. - * Whenever needed it collects input character stream into chunks of - * 32 bit values and invokes a block function that performs actual hash - * calculations. - * - * Porting guide. - * - * Obligatory macros: - * - * DATA_ORDER_IS_BIG_ENDIAN or DATA_ORDER_IS_LITTLE_ENDIAN - * this macro defines byte order of input stream. - * HASH_CBLOCK - * size of a unit chunk HASH_BLOCK operates on. - * HASH_LONG - * has to be at lest 32 bit wide, if it's wider, then - * HASH_LONG_LOG2 *has to* be defined along - * HASH_CTX - * context structure that at least contains following - * members: - * typedef struct { - * ... - * HASH_LONG Nl,Nh; - * HASH_LONG data[HASH_LBLOCK]; - * int num; - * ... - * } HASH_CTX; - * HASH_UPDATE - * name of "Update" function, implemented here. - * HASH_TRANSFORM - * name of "Transform" function, implemented here. - * HASH_FINAL - * name of "Final" function, implemented here. - * HASH_BLOCK_HOST_ORDER - * name of "block" function treating *aligned* input message - * in host byte order, implemented externally. - * HASH_BLOCK_DATA_ORDER - * name of "block" function treating *unaligned* input message - * in original (data) byte order, implemented externally (it - * actually is optional if data and host are of the same - * "endianess"). - * HASH_MAKE_STRING - * macro convering context variables to an ASCII hash string. - * - * Optional macros: - * - * B_ENDIAN or L_ENDIAN - * defines host byte-order. - * HASH_LONG_LOG2 - * defaults to 2 if not states otherwise. - * HASH_LBLOCK - * assumed to be HASH_CBLOCK/4 if not stated otherwise. - * HASH_BLOCK_DATA_ORDER_ALIGNED - * alternative "block" function capable of treating - * aligned input message in original (data) order, - * implemented externally. - * - * MD5 example: - * - * #define DATA_ORDER_IS_LITTLE_ENDIAN - * - * #define HASH_LONG mDNSu32 - * #define HASH_LONG_LOG2 mDNSu32_LOG2 - * #define HASH_CTX MD5_CTX - * #define HASH_CBLOCK MD5_CBLOCK - * #define HASH_LBLOCK MD5_LBLOCK - * #define HASH_UPDATE MD5_Update - * #define HASH_TRANSFORM MD5_Transform - * #define HASH_FINAL MD5_Final - * #define HASH_BLOCK_HOST_ORDER md5_block_host_order - * #define HASH_BLOCK_DATA_ORDER md5_block_data_order - * - * - */ - -#if !defined(DATA_ORDER_IS_BIG_ENDIAN) && !defined(DATA_ORDER_IS_LITTLE_ENDIAN) -#error "DATA_ORDER must be defined!" -#endif - -#ifndef HASH_CBLOCK -#error "HASH_CBLOCK must be defined!" -#endif -#ifndef HASH_LONG -#error "HASH_LONG must be defined!" -#endif -#ifndef HASH_CTX -#error "HASH_CTX must be defined!" -#endif - -#ifndef HASH_UPDATE -#error "HASH_UPDATE must be defined!" -#endif -#ifndef HASH_TRANSFORM -#error "HASH_TRANSFORM must be defined!" -#endif -#ifndef HASH_FINAL -#error "HASH_FINAL must be defined!" -#endif - -#ifndef HASH_BLOCK_HOST_ORDER -#error "HASH_BLOCK_HOST_ORDER must be defined!" -#endif - -#if 0 -/* - * Moved below as it's required only if HASH_BLOCK_DATA_ORDER_ALIGNED - * isn't defined. - */ -#ifndef HASH_BLOCK_DATA_ORDER -#error "HASH_BLOCK_DATA_ORDER must be defined!" -#endif -#endif - -#ifndef HASH_LBLOCK -#define HASH_LBLOCK (HASH_CBLOCK/4) -#endif - -#ifndef HASH_LONG_LOG2 -#define HASH_LONG_LOG2 2 -#endif - -/* - * Engage compiler specific rotate intrinsic function if available. - */ -#undef ROTATE -#ifndef PEDANTIC -# if 0 /* defined(_MSC_VER) */ -# define ROTATE(a,n) _lrotl(a,n) -# elif defined(__MWERKS__) -# if defined(__POWERPC__) -# define ROTATE(a,n) (unsigned MD32_REG_T)__rlwinm((int)a,n,0,31) -# elif defined(__MC68K__) - /* Motorola specific tweak. */ -# define ROTATE(a,n) (n<24 ? __rol(a,n) : __ror(a,32-n)) -# else -# define ROTATE(a,n) __rol(a,n) -# endif -# elif defined(__GNUC__) && __GNUC__>=2 && !defined(OPENSSL_NO_ASM) && !defined(OPENSSL_NO_INLINE_ASM) - /* - * Some GNU C inline assembler templates. Note that these are - * rotates by *constant* number of bits! But that's exactly - * what we need here... - * - * - */ - /* - * LLVM is more strict about compatibility of types between input & output constraints, - * but we want these to be rotations of 32 bits, not 64, so we explicitly drop the - * most significant bytes by casting to an unsigned int. - */ -# if defined(__i386) || defined(__i386__) || defined(__x86_64) || defined(__x86_64__) -# define ROTATE(a,n) ({ register unsigned int ret; \ - asm ( \ - "roll %1,%0" \ - : "=r"(ret) \ - : "I"(n), "0"((unsigned int)a) \ - : "cc"); \ - ret; \ - }) -# elif defined(__powerpc) || defined(__ppc) -# define ROTATE(a,n) ({ register unsigned int ret; \ - asm ( \ - "rlwinm %0,%1,%2,0,31" \ - : "=r"(ret) \ - : "r"(a), "I"(n)); \ - ret; \ - }) -# endif -# endif - -/* - * Engage compiler specific "fetch in reverse byte order" - * intrinsic function if available. - */ -# if defined(__GNUC__) && __GNUC__>=2 && !defined(OPENSSL_NO_ASM) && !defined(OPENSSL_NO_INLINE_ASM) - /* some GNU C inline assembler templates by */ -# if (defined(__i386) || defined(__i386__) || defined(__x86_64) || defined(__x86_64__)) && !defined(I386_ONLY) -# define BE_FETCH32(a) ({ register unsigned int l=(a);\ - asm ( \ - "bswapl %0" \ - : "=r"(l) : "0"(l)); \ - l; \ - }) -# elif defined(__powerpc) -# define LE_FETCH32(a) ({ register unsigned int l; \ - asm ( \ - "lwbrx %0,0,%1" \ - : "=r"(l) \ - : "r"(a)); \ - l; \ - }) - -# elif defined(__sparc) && defined(OPENSSL_SYS_ULTRASPARC) -# define LE_FETCH32(a) ({ register unsigned int l; \ - asm ( \ - "lda [%1]#ASI_PRIMARY_LITTLE,%0"\ - : "=r"(l) \ - : "r"(a)); \ - l; \ - }) -# endif -# endif -#endif /* PEDANTIC */ - -#if HASH_LONG_LOG2==2 /* Engage only if sizeof(HASH_LONG)== 4 */ -/* A nice byte order reversal from Wei Dai */ -#ifdef ROTATE -/* 5 instructions with rotate instruction, else 9 */ -#define REVERSE_FETCH32(a,l) ( \ - l=*(const HASH_LONG *)(a), \ - ((ROTATE(l,8)&0x00FF00FF)|(ROTATE((l&0x00FF00FF),24))) \ - ) -#else -/* 6 instructions with rotate instruction, else 8 */ -#define REVERSE_FETCH32(a,l) ( \ - l=*(const HASH_LONG *)(a), \ - l=(((l>>8)&0x00FF00FF)|((l&0x00FF00FF)<<8)), \ - ROTATE(l,16) \ - ) -/* - * Originally the middle line started with l=(((l&0xFF00FF00)>>8)|... - * It's rewritten as above for two reasons: - * - RISCs aren't good at long constants and have to explicitely - * compose 'em with several (well, usually 2) instructions in a - * register before performing the actual operation and (as you - * already realized:-) having same constant should inspire the - * compiler to permanently allocate the only register for it; - * - most modern CPUs have two ALUs, but usually only one has - * circuitry for shifts:-( this minor tweak inspires compiler - * to schedule shift instructions in a better way... - * - * - */ -#endif -#endif - -#ifndef ROTATE -#define ROTATE(a,n) (((a)<<(n))|(((a)&0xffffffff)>>(32-(n)))) -#endif - -/* - * Make some obvious choices. E.g., HASH_BLOCK_DATA_ORDER_ALIGNED - * and HASH_BLOCK_HOST_ORDER ought to be the same if input data - * and host are of the same "endianess". It's possible to mask - * this with blank #define HASH_BLOCK_DATA_ORDER though... - * - * - */ -#if defined(B_ENDIAN) -# if defined(DATA_ORDER_IS_BIG_ENDIAN) -# if !defined(HASH_BLOCK_DATA_ORDER_ALIGNED) && HASH_LONG_LOG2==2 -# define HASH_BLOCK_DATA_ORDER_ALIGNED HASH_BLOCK_HOST_ORDER -# endif -# elif defined(DATA_ORDER_IS_LITTLE_ENDIAN) -# ifndef HOST_FETCH32 -# ifdef LE_FETCH32 -# define HOST_FETCH32(p,l) LE_FETCH32(p) -# elif defined(REVERSE_FETCH32) -# define HOST_FETCH32(p,l) REVERSE_FETCH32(p,l) -# endif -# endif -# endif -#elif defined(L_ENDIAN) -# if defined(DATA_ORDER_IS_LITTLE_ENDIAN) -# if !defined(HASH_BLOCK_DATA_ORDER_ALIGNED) && HASH_LONG_LOG2==2 -# define HASH_BLOCK_DATA_ORDER_ALIGNED HASH_BLOCK_HOST_ORDER -# endif -# elif defined(DATA_ORDER_IS_BIG_ENDIAN) -# ifndef HOST_FETCH32 -# ifdef BE_FETCH32 -# define HOST_FETCH32(p,l) BE_FETCH32(p) -# elif defined(REVERSE_FETCH32) -# define HOST_FETCH32(p,l) REVERSE_FETCH32(p,l) -# endif -# endif -# endif -#endif - -#if !defined(HASH_BLOCK_DATA_ORDER_ALIGNED) -#ifndef HASH_BLOCK_DATA_ORDER -#error "HASH_BLOCK_DATA_ORDER must be defined!" -#endif -#endif - -// None of the invocations of the following macros actually use the result, -// so cast them to void to avoid any compiler warnings/errors about not using -// the result (e.g. when using clang). -// If the resultant values need to be used at some point, these must be changed. -#define HOST_c2l(c,l) ((void)_HOST_c2l(c,l)) -#define HOST_l2c(l,c) ((void)_HOST_l2c(l,c)) - -#if defined(DATA_ORDER_IS_BIG_ENDIAN) - -#define _HOST_c2l(c,l) (l =(((unsigned long)(*((c)++)))<<24), \ - l|=(((unsigned long)(*((c)++)))<<16), \ - l|=(((unsigned long)(*((c)++)))<< 8), \ - l|=(((unsigned long)(*((c)++))) ), \ - l) -#define HOST_p_c2l(c,l,n) { \ - switch (n) { \ - case 0: l =((unsigned long)(*((c)++)))<<24; \ - case 1: l|=((unsigned long)(*((c)++)))<<16; \ - case 2: l|=((unsigned long)(*((c)++)))<< 8; \ - case 3: l|=((unsigned long)(*((c)++))); \ - } } -#define HOST_p_c2l_p(c,l,sc,len) { \ - switch (sc) { \ - case 0: l =((unsigned long)(*((c)++)))<<24; \ - if (--len == 0) break; \ - case 1: l|=((unsigned long)(*((c)++)))<<16; \ - if (--len == 0) break; \ - case 2: l|=((unsigned long)(*((c)++)))<< 8; \ - } } -/* NOTE the pointer is not incremented at the end of this */ -#define HOST_c2l_p(c,l,n) { \ - l=0; (c)+=n; \ - switch (n) { \ - case 3: l =((unsigned long)(*(--(c))))<< 8; \ - case 2: l|=((unsigned long)(*(--(c))))<<16; \ - case 1: l|=((unsigned long)(*(--(c))))<<24; \ - } } -#define _HOST_l2c(l,c) (*((c)++)=(unsigned char)(((l)>>24)&0xff), \ - *((c)++)=(unsigned char)(((l)>>16)&0xff), \ - *((c)++)=(unsigned char)(((l)>> 8)&0xff), \ - *((c)++)=(unsigned char)(((l) )&0xff), \ - l) - -#elif defined(DATA_ORDER_IS_LITTLE_ENDIAN) - -#define _HOST_c2l(c,l) (l =(((unsigned long)(*((c)++))) ), \ - l|=(((unsigned long)(*((c)++)))<< 8), \ - l|=(((unsigned long)(*((c)++)))<<16), \ - l|=(((unsigned long)(*((c)++)))<<24), \ - l) -#define HOST_p_c2l(c,l,n) { \ - switch (n) { \ - case 0: l =((unsigned long)(*((c)++))); \ - case 1: l|=((unsigned long)(*((c)++)))<< 8; \ - case 2: l|=((unsigned long)(*((c)++)))<<16; \ - case 3: l|=((unsigned long)(*((c)++)))<<24; \ - } } -#define HOST_p_c2l_p(c,l,sc,len) { \ - switch (sc) { \ - case 0: l =((unsigned long)(*((c)++))); \ - if (--len == 0) break; \ - case 1: l|=((unsigned long)(*((c)++)))<< 8; \ - if (--len == 0) break; \ - case 2: l|=((unsigned long)(*((c)++)))<<16; \ - } } -/* NOTE the pointer is not incremented at the end of this */ -#define HOST_c2l_p(c,l,n) { \ - l=0; (c)+=n; \ - switch (n) { \ - case 3: l =((unsigned long)(*(--(c))))<<16; \ - case 2: l|=((unsigned long)(*(--(c))))<< 8; \ - case 1: l|=((unsigned long)(*(--(c)))); \ - } } -#define _HOST_l2c(l,c) (*((c)++)=(unsigned char)(((l) )&0xff), \ - *((c)++)=(unsigned char)(((l)>> 8)&0xff), \ - *((c)++)=(unsigned char)(((l)>>16)&0xff), \ - *((c)++)=(unsigned char)(((l)>>24)&0xff), \ - l) - -#endif - -/* - * Time for some action:-) - */ - -int HASH_UPDATE (HASH_CTX *c, const void *data_, unsigned long len) - { - const unsigned char *data=(const unsigned char *)data_; - register HASH_LONG * p; - register unsigned long l; - int sw,sc,ew,ec; - - if (len==0) return 1; - - l=(c->Nl+(len<<3))&0xffffffffL; - /* 95-05-24 eay Fixed a bug with the overflow handling, thanks to - * Wei Dai for pointing it out. */ - if (l < c->Nl) /* overflow */ - c->Nh++; - c->Nh+=(len>>29); - c->Nl=l; - - if (c->num != 0) - { - p=c->data; - sw=c->num>>2; - sc=c->num&0x03; - - if ((c->num+len) >= HASH_CBLOCK) - { - l=p[sw]; HOST_p_c2l(data,l,sc); p[sw++]=l; - for (; swnum); - c->num=0; - /* drop through and do the rest */ - } - else - { - c->num+=len; - if ((sc+len) < 4) /* ugly, add char's to a word */ - { - l=p[sw]; HOST_p_c2l_p(data,l,sc,len); p[sw]=l; - } - else - { - ew=(c->num>>2); - ec=(c->num&0x03); - if (sc) - l=p[sw]; - HOST_p_c2l(data,l,sc); - p[sw++]=l; - for (; sw < ew; sw++) - { - HOST_c2l(data,l); p[sw]=l; - } - if (ec) - { - HOST_c2l_p(data,l,ec); p[sw]=l; - } - } - return 1; - } - } - - sw=(int)(len/HASH_CBLOCK); - if (sw > 0) - { -#if defined(HASH_BLOCK_DATA_ORDER_ALIGNED) - /* - * Note that HASH_BLOCK_DATA_ORDER_ALIGNED gets defined - * only if sizeof(HASH_LONG)==4. - */ - if ((((unsigned long)data)%4) == 0) - { - /* data is properly aligned so that we can cast it: */ - HASH_BLOCK_DATA_ORDER_ALIGNED (c,(HASH_LONG *)data,sw); - sw*=HASH_CBLOCK; - data+=sw; - len-=sw; - } - else -#if !defined(HASH_BLOCK_DATA_ORDER) - while (sw--) - { - mDNSPlatformMemCopy(p=c->data,data,HASH_CBLOCK); - HASH_BLOCK_DATA_ORDER_ALIGNED(c,p,1); - data+=HASH_CBLOCK; - len-=HASH_CBLOCK; - } -#endif -#endif -#if defined(HASH_BLOCK_DATA_ORDER) - { - HASH_BLOCK_DATA_ORDER(c,data,sw); - sw*=HASH_CBLOCK; - data+=sw; - len-=sw; - } -#endif - } - - if (len!=0) - { - p = c->data; - c->num = (int)len; - ew=(int)(len>>2); /* words to copy */ - ec=(int)(len&0x03); - for (; ew; ew--,p++) - { - HOST_c2l(data,l); *p=l; - } - HOST_c2l_p(data,l,ec); - *p=l; - } - return 1; - } - - -void HASH_TRANSFORM (HASH_CTX *c, const unsigned char *data) - { -#if defined(HASH_BLOCK_DATA_ORDER_ALIGNED) - if ((((unsigned long)data)%4) == 0) - /* data is properly aligned so that we can cast it: */ - HASH_BLOCK_DATA_ORDER_ALIGNED (c,(HASH_LONG *)data,1); - else -#if !defined(HASH_BLOCK_DATA_ORDER) - { - mDNSPlatformMemCopy(c->data,data,HASH_CBLOCK); - HASH_BLOCK_DATA_ORDER_ALIGNED (c,c->data,1); - } -#endif -#endif -#if defined(HASH_BLOCK_DATA_ORDER) - HASH_BLOCK_DATA_ORDER (c,data,1); -#endif - } - - -int HASH_FINAL (unsigned char *md, HASH_CTX *c) - { - register HASH_LONG *p; - register unsigned long l; - register int i,j; - static const unsigned char end[4]={0x80,0x00,0x00,0x00}; - const unsigned char *cp=end; - - /* c->num should definitly have room for at least one more byte. */ - p=c->data; - i=c->num>>2; - j=c->num&0x03; - -#if 0 - /* purify often complains about the following line as an - * Uninitialized Memory Read. While this can be true, the - * following p_c2l macro will reset l when that case is true. - * This is because j&0x03 contains the number of 'valid' bytes - * already in p[i]. If and only if j&0x03 == 0, the UMR will - * occur but this is also the only time p_c2l will do - * l= *(cp++) instead of l|= *(cp++) - * Many thanks to Alex Tang for pickup this - * 'potential bug' */ -#ifdef PURIFY - if (j==0) p[i]=0; /* Yeah, but that's not the way to fix it:-) */ -#endif - l=p[i]; -#else - l = (j==0) ? 0 : p[i]; -#endif - HOST_p_c2l(cp,l,j); p[i++]=l; /* i is the next 'undefined word' */ - - if (i>(HASH_LBLOCK-2)) /* save room for Nl and Nh */ - { - if (iNh; - p[HASH_LBLOCK-1]=c->Nl; -#elif defined(DATA_ORDER_IS_LITTLE_ENDIAN) - p[HASH_LBLOCK-2]=c->Nl; - p[HASH_LBLOCK-1]=c->Nh; -#endif - HASH_BLOCK_HOST_ORDER (c,p,1); - -#ifndef HASH_MAKE_STRING -#error "HASH_MAKE_STRING must be defined!" -#else - HASH_MAKE_STRING(c,md); -#endif - - c->num=0; - /* clear stuff, HASH_BLOCK may be leaving some stuff on the stack - * but I'm not worried :-) - OPENSSL_cleanse((void *)c,sizeof(HASH_CTX)); - */ - return 1; - } - -#ifndef MD32_REG_T -#define MD32_REG_T long -/* - * This comment was originaly written for MD5, which is why it - * discusses A-D. But it basically applies to all 32-bit digests, - * which is why it was moved to common header file. - * - * In case you wonder why A-D are declared as long and not - * as mDNSu32. Doing so results in slight performance - * boost on LP64 architectures. The catch is we don't - * really care if 32 MSBs of a 64-bit register get polluted - * with eventual overflows as we *save* only 32 LSBs in - * *either* case. Now declaring 'em long excuses the compiler - * from keeping 32 MSBs zeroed resulting in 13% performance - * improvement under SPARC Solaris7/64 and 5% under AlphaLinux. - * Well, to be honest it should say that this *prevents* - * performance degradation. - * - * Apparently there're LP64 compilers that generate better - * code if A-D are declared int. Most notably GCC-x86_64 - * generates better code. - * - */ -#endif - - -// from md5_locl.h (continued) - -/* -#define F(x,y,z) (((x) & (y)) | ((~(x)) & (z))) -#define G(x,y,z) (((x) & (z)) | ((y) & (~(z)))) -*/ - -/* As pointed out by Wei Dai , the above can be - * simplified to the code below. Wei attributes these optimizations - * to Peter Gutmann's SHS code, and he attributes it to Rich Schroeppel. - */ -#define F(b,c,d) ((((c) ^ (d)) & (b)) ^ (d)) -#define G(b,c,d) ((((b) ^ (c)) & (d)) ^ (c)) -#define H(b,c,d) ((b) ^ (c) ^ (d)) -#define I(b,c,d) (((~(d)) | (b)) ^ (c)) - -#define R0(a,b,c,d,k,s,t) { \ - a+=((k)+(t)+F((b),(c),(d))); \ - a=ROTATE(a,s); \ - a+=b; };\ - -#define R1(a,b,c,d,k,s,t) { \ - a+=((k)+(t)+G((b),(c),(d))); \ - a=ROTATE(a,s); \ - a+=b; }; - -#define R2(a,b,c,d,k,s,t) { \ - a+=((k)+(t)+H((b),(c),(d))); \ - a=ROTATE(a,s); \ - a+=b; }; - -#define R3(a,b,c,d,k,s,t) { \ - a+=((k)+(t)+I((b),(c),(d))); \ - a=ROTATE(a,s); \ - a+=b; }; - -// from md5_dgst.c - - -/* Implemented from RFC1321 The MD5 Message-Digest Algorithm - */ - -#define INIT_DATA_A (unsigned long)0x67452301L -#define INIT_DATA_B (unsigned long)0xefcdab89L -#define INIT_DATA_C (unsigned long)0x98badcfeL -#define INIT_DATA_D (unsigned long)0x10325476L - -int MD5_Init(MD5_CTX *c) - { - c->A=INIT_DATA_A; - c->B=INIT_DATA_B; - c->C=INIT_DATA_C; - c->D=INIT_DATA_D; - c->Nl=0; - c->Nh=0; - c->num=0; - return 1; - } - -#ifndef md5_block_host_order -void md5_block_host_order (MD5_CTX *c, const void *data, int num) - { - const mDNSu32 *X=(const mDNSu32 *)data; - register unsigned MD32_REG_T A,B,C,D; - - A=c->A; - B=c->B; - C=c->C; - D=c->D; - - for (;num--;X+=HASH_LBLOCK) - { - /* Round 0 */ - R0(A,B,C,D,X[ 0], 7,0xd76aa478L); - R0(D,A,B,C,X[ 1],12,0xe8c7b756L); - R0(C,D,A,B,X[ 2],17,0x242070dbL); - R0(B,C,D,A,X[ 3],22,0xc1bdceeeL); - R0(A,B,C,D,X[ 4], 7,0xf57c0fafL); - R0(D,A,B,C,X[ 5],12,0x4787c62aL); - R0(C,D,A,B,X[ 6],17,0xa8304613L); - R0(B,C,D,A,X[ 7],22,0xfd469501L); - R0(A,B,C,D,X[ 8], 7,0x698098d8L); - R0(D,A,B,C,X[ 9],12,0x8b44f7afL); - R0(C,D,A,B,X[10],17,0xffff5bb1L); - R0(B,C,D,A,X[11],22,0x895cd7beL); - R0(A,B,C,D,X[12], 7,0x6b901122L); - R0(D,A,B,C,X[13],12,0xfd987193L); - R0(C,D,A,B,X[14],17,0xa679438eL); - R0(B,C,D,A,X[15],22,0x49b40821L); - /* Round 1 */ - R1(A,B,C,D,X[ 1], 5,0xf61e2562L); - R1(D,A,B,C,X[ 6], 9,0xc040b340L); - R1(C,D,A,B,X[11],14,0x265e5a51L); - R1(B,C,D,A,X[ 0],20,0xe9b6c7aaL); - R1(A,B,C,D,X[ 5], 5,0xd62f105dL); - R1(D,A,B,C,X[10], 9,0x02441453L); - R1(C,D,A,B,X[15],14,0xd8a1e681L); - R1(B,C,D,A,X[ 4],20,0xe7d3fbc8L); - R1(A,B,C,D,X[ 9], 5,0x21e1cde6L); - R1(D,A,B,C,X[14], 9,0xc33707d6L); - R1(C,D,A,B,X[ 3],14,0xf4d50d87L); - R1(B,C,D,A,X[ 8],20,0x455a14edL); - R1(A,B,C,D,X[13], 5,0xa9e3e905L); - R1(D,A,B,C,X[ 2], 9,0xfcefa3f8L); - R1(C,D,A,B,X[ 7],14,0x676f02d9L); - R1(B,C,D,A,X[12],20,0x8d2a4c8aL); - /* Round 2 */ - R2(A,B,C,D,X[ 5], 4,0xfffa3942L); - R2(D,A,B,C,X[ 8],11,0x8771f681L); - R2(C,D,A,B,X[11],16,0x6d9d6122L); - R2(B,C,D,A,X[14],23,0xfde5380cL); - R2(A,B,C,D,X[ 1], 4,0xa4beea44L); - R2(D,A,B,C,X[ 4],11,0x4bdecfa9L); - R2(C,D,A,B,X[ 7],16,0xf6bb4b60L); - R2(B,C,D,A,X[10],23,0xbebfbc70L); - R2(A,B,C,D,X[13], 4,0x289b7ec6L); - R2(D,A,B,C,X[ 0],11,0xeaa127faL); - R2(C,D,A,B,X[ 3],16,0xd4ef3085L); - R2(B,C,D,A,X[ 6],23,0x04881d05L); - R2(A,B,C,D,X[ 9], 4,0xd9d4d039L); - R2(D,A,B,C,X[12],11,0xe6db99e5L); - R2(C,D,A,B,X[15],16,0x1fa27cf8L); - R2(B,C,D,A,X[ 2],23,0xc4ac5665L); - /* Round 3 */ - R3(A,B,C,D,X[ 0], 6,0xf4292244L); - R3(D,A,B,C,X[ 7],10,0x432aff97L); - R3(C,D,A,B,X[14],15,0xab9423a7L); - R3(B,C,D,A,X[ 5],21,0xfc93a039L); - R3(A,B,C,D,X[12], 6,0x655b59c3L); - R3(D,A,B,C,X[ 3],10,0x8f0ccc92L); - R3(C,D,A,B,X[10],15,0xffeff47dL); - R3(B,C,D,A,X[ 1],21,0x85845dd1L); - R3(A,B,C,D,X[ 8], 6,0x6fa87e4fL); - R3(D,A,B,C,X[15],10,0xfe2ce6e0L); - R3(C,D,A,B,X[ 6],15,0xa3014314L); - R3(B,C,D,A,X[13],21,0x4e0811a1L); - R3(A,B,C,D,X[ 4], 6,0xf7537e82L); - R3(D,A,B,C,X[11],10,0xbd3af235L); - R3(C,D,A,B,X[ 2],15,0x2ad7d2bbL); - R3(B,C,D,A,X[ 9],21,0xeb86d391L); - - A = c->A += A; - B = c->B += B; - C = c->C += C; - D = c->D += D; - } - } -#endif - -#ifndef md5_block_data_order -#ifdef X -#undef X -#endif -void md5_block_data_order (MD5_CTX *c, const void *data_, int num) - { - const unsigned char *data=data_; - register unsigned MD32_REG_T A,B,C,D,l; -#ifndef MD32_XARRAY - /* See comment in crypto/sha/sha_locl.h for details. */ - unsigned MD32_REG_T XX0, XX1, XX2, XX3, XX4, XX5, XX6, XX7, - XX8, XX9,XX10,XX11,XX12,XX13,XX14,XX15; -# define X(i) XX##i -#else - mDNSu32 XX[MD5_LBLOCK]; -# define X(i) XX[i] -#endif - - A=c->A; - B=c->B; - C=c->C; - D=c->D; - - for (;num--;) - { - HOST_c2l(data,l); X( 0)=l; HOST_c2l(data,l); X( 1)=l; - /* Round 0 */ - R0(A,B,C,D,X( 0), 7,0xd76aa478L); HOST_c2l(data,l); X( 2)=l; - R0(D,A,B,C,X( 1),12,0xe8c7b756L); HOST_c2l(data,l); X( 3)=l; - R0(C,D,A,B,X( 2),17,0x242070dbL); HOST_c2l(data,l); X( 4)=l; - R0(B,C,D,A,X( 3),22,0xc1bdceeeL); HOST_c2l(data,l); X( 5)=l; - R0(A,B,C,D,X( 4), 7,0xf57c0fafL); HOST_c2l(data,l); X( 6)=l; - R0(D,A,B,C,X( 5),12,0x4787c62aL); HOST_c2l(data,l); X( 7)=l; - R0(C,D,A,B,X( 6),17,0xa8304613L); HOST_c2l(data,l); X( 8)=l; - R0(B,C,D,A,X( 7),22,0xfd469501L); HOST_c2l(data,l); X( 9)=l; - R0(A,B,C,D,X( 8), 7,0x698098d8L); HOST_c2l(data,l); X(10)=l; - R0(D,A,B,C,X( 9),12,0x8b44f7afL); HOST_c2l(data,l); X(11)=l; - R0(C,D,A,B,X(10),17,0xffff5bb1L); HOST_c2l(data,l); X(12)=l; - R0(B,C,D,A,X(11),22,0x895cd7beL); HOST_c2l(data,l); X(13)=l; - R0(A,B,C,D,X(12), 7,0x6b901122L); HOST_c2l(data,l); X(14)=l; - R0(D,A,B,C,X(13),12,0xfd987193L); HOST_c2l(data,l); X(15)=l; - R0(C,D,A,B,X(14),17,0xa679438eL); - R0(B,C,D,A,X(15),22,0x49b40821L); - /* Round 1 */ - R1(A,B,C,D,X( 1), 5,0xf61e2562L); - R1(D,A,B,C,X( 6), 9,0xc040b340L); - R1(C,D,A,B,X(11),14,0x265e5a51L); - R1(B,C,D,A,X( 0),20,0xe9b6c7aaL); - R1(A,B,C,D,X( 5), 5,0xd62f105dL); - R1(D,A,B,C,X(10), 9,0x02441453L); - R1(C,D,A,B,X(15),14,0xd8a1e681L); - R1(B,C,D,A,X( 4),20,0xe7d3fbc8L); - R1(A,B,C,D,X( 9), 5,0x21e1cde6L); - R1(D,A,B,C,X(14), 9,0xc33707d6L); - R1(C,D,A,B,X( 3),14,0xf4d50d87L); - R1(B,C,D,A,X( 8),20,0x455a14edL); - R1(A,B,C,D,X(13), 5,0xa9e3e905L); - R1(D,A,B,C,X( 2), 9,0xfcefa3f8L); - R1(C,D,A,B,X( 7),14,0x676f02d9L); - R1(B,C,D,A,X(12),20,0x8d2a4c8aL); - /* Round 2 */ - R2(A,B,C,D,X( 5), 4,0xfffa3942L); - R2(D,A,B,C,X( 8),11,0x8771f681L); - R2(C,D,A,B,X(11),16,0x6d9d6122L); - R2(B,C,D,A,X(14),23,0xfde5380cL); - R2(A,B,C,D,X( 1), 4,0xa4beea44L); - R2(D,A,B,C,X( 4),11,0x4bdecfa9L); - R2(C,D,A,B,X( 7),16,0xf6bb4b60L); - R2(B,C,D,A,X(10),23,0xbebfbc70L); - R2(A,B,C,D,X(13), 4,0x289b7ec6L); - R2(D,A,B,C,X( 0),11,0xeaa127faL); - R2(C,D,A,B,X( 3),16,0xd4ef3085L); - R2(B,C,D,A,X( 6),23,0x04881d05L); - R2(A,B,C,D,X( 9), 4,0xd9d4d039L); - R2(D,A,B,C,X(12),11,0xe6db99e5L); - R2(C,D,A,B,X(15),16,0x1fa27cf8L); - R2(B,C,D,A,X( 2),23,0xc4ac5665L); - /* Round 3 */ - R3(A,B,C,D,X( 0), 6,0xf4292244L); - R3(D,A,B,C,X( 7),10,0x432aff97L); - R3(C,D,A,B,X(14),15,0xab9423a7L); - R3(B,C,D,A,X( 5),21,0xfc93a039L); - R3(A,B,C,D,X(12), 6,0x655b59c3L); - R3(D,A,B,C,X( 3),10,0x8f0ccc92L); - R3(C,D,A,B,X(10),15,0xffeff47dL); - R3(B,C,D,A,X( 1),21,0x85845dd1L); - R3(A,B,C,D,X( 8), 6,0x6fa87e4fL); - R3(D,A,B,C,X(15),10,0xfe2ce6e0L); - R3(C,D,A,B,X( 6),15,0xa3014314L); - R3(B,C,D,A,X(13),21,0x4e0811a1L); - R3(A,B,C,D,X( 4), 6,0xf7537e82L); - R3(D,A,B,C,X(11),10,0xbd3af235L); - R3(C,D,A,B,X( 2),15,0x2ad7d2bbL); - R3(B,C,D,A,X( 9),21,0xeb86d391L); - - A = c->A += A; - B = c->B += B; - C = c->C += C; - D = c->D += D; - } - } -#endif - - - // *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - base64 -> binary conversion -#endif - -static const char Base64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; -static const char Pad64 = '='; - - -#define mDNSisspace(x) (x == '\t' || x == '\n' || x == '\v' || x == '\f' || x == '\r' || x == ' ') - -mDNSlocal const char *mDNSstrchr(const char *s, int c) - { - while (1) - { - if (c == *s) return s; - if (!*s) return mDNSNULL; - s++; - } - } - -// skips all whitespace anywhere. -// converts characters, four at a time, starting at (or after) -// src from base - 64 numbers into three 8 bit bytes in the target area. -// it returns the number of data bytes stored at the target, or -1 on error. -// adapted from BIND sources - -mDNSlocal mDNSs32 DNSDigest_Base64ToBin(const char *src, mDNSu8 *target, mDNSu32 targsize) - { - int tarindex, state, ch; - const char *pos; - - state = 0; - tarindex = 0; - - while ((ch = *src++) != '\0') { - if (mDNSisspace(ch)) /* Skip whitespace anywhere. */ - continue; - - if (ch == Pad64) - break; - - pos = mDNSstrchr(Base64, ch); - if (pos == 0) /* A non-base64 character. */ - return (-1); - - switch (state) { - case 0: - if (target) { - if ((mDNSu32)tarindex >= targsize) - return (-1); - target[tarindex] = (mDNSu8)((pos - Base64) << 2); - } - state = 1; - break; - case 1: - if (target) { - if ((mDNSu32)tarindex + 1 >= targsize) - return (-1); - target[tarindex] |= (pos - Base64) >> 4; - target[tarindex+1] = (mDNSu8)(((pos - Base64) & 0x0f) << 4); - } - tarindex++; - state = 2; - break; - case 2: - if (target) { - if ((mDNSu32)tarindex + 1 >= targsize) - return (-1); - target[tarindex] |= (pos - Base64) >> 2; - target[tarindex+1] = (mDNSu8)(((pos - Base64) & 0x03) << 6); - } - tarindex++; - state = 3; - break; - case 3: - if (target) { - if ((mDNSu32)tarindex >= targsize) - return (-1); - target[tarindex] |= (pos - Base64); - } - tarindex++; - state = 0; - break; - default: - return -1; - } - } - - /* - * We are done decoding Base-64 chars. Let's see if we ended - * on a byte boundary, and/or with erroneous trailing characters. - */ - - if (ch == Pad64) { /* We got a pad char. */ - ch = *src++; /* Skip it, get next. */ - switch (state) { - case 0: /* Invalid = in first position */ - case 1: /* Invalid = in second position */ - return (-1); - - case 2: /* Valid, means one byte of info */ - /* Skip any number of spaces. */ - for ((void)mDNSNULL; ch != '\0'; ch = *src++) - if (!mDNSisspace(ch)) - break; - /* Make sure there is another trailing = sign. */ - if (ch != Pad64) - return (-1); - ch = *src++; /* Skip the = */ - /* Fall through to "single trailing =" case. */ - /* FALLTHROUGH */ - - case 3: /* Valid, means two bytes of info */ - /* - * We know this char is an =. Is there anything but - * whitespace after it? - */ - for ((void)mDNSNULL; ch != '\0'; ch = *src++) - if (!mDNSisspace(ch)) - return (-1); - - /* - * Now make sure for cases 2 and 3 that the "extra" - * bits that slopped past the last full byte were - * zeros. If we don't check them, they become a - * subliminal channel. - */ - if (target && target[tarindex] != 0) - return (-1); - } - } else { - /* - * We ended by seeing the end of the string. Make sure we - * have no partial bytes lying around. - */ - if (state != 0) - return (-1); - } - - return (tarindex); - } - - - // *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - API exported to mDNS Core -#endif - -// Constants -#define HMAC_IPAD 0x36 -#define HMAC_OPAD 0x5c -#define MD5_LEN 16 - -#define HMAC_MD5_AlgName (*(const domainname*) "\010" "hmac-md5" "\007" "sig-alg" "\003" "reg" "\003" "int") - -// Adapted from Appendix, RFC 2104 -mDNSlocal void DNSDigest_ConstructHMACKey(DomainAuthInfo *info, const mDNSu8 *key, mDNSu32 len) - { - MD5_CTX k; - mDNSu8 buf[MD5_LEN]; - int i; - - // If key is longer than HMAC_LEN reset it to MD5(key) - if (len > HMAC_LEN) - { - MD5_Init(&k); - MD5_Update(&k, key, len); - MD5_Final(buf, &k); - key = buf; - len = MD5_LEN; - } - - // store key in pads - mDNSPlatformMemZero(info->keydata_ipad, HMAC_LEN); - mDNSPlatformMemZero(info->keydata_opad, HMAC_LEN); - mDNSPlatformMemCopy(info->keydata_ipad, key, len); - mDNSPlatformMemCopy(info->keydata_opad, key, len); - - // XOR key with ipad and opad values - for (i = 0; i < HMAC_LEN; i++) - { - info->keydata_ipad[i] ^= HMAC_IPAD; - info->keydata_opad[i] ^= HMAC_OPAD; - } - - } - -mDNSexport mDNSs32 DNSDigest_ConstructHMACKeyfromBase64(DomainAuthInfo *info, const char *b64key) - { - mDNSu8 keybuf[1024]; - mDNSs32 keylen = DNSDigest_Base64ToBin(b64key, keybuf, sizeof(keybuf)); - if (keylen < 0) return(keylen); - DNSDigest_ConstructHMACKey(info, keybuf, (mDNSu32)keylen); - return(keylen); - } - -mDNSexport void DNSDigest_SignMessage(DNSMessage *msg, mDNSu8 **end, DomainAuthInfo *info, mDNSu16 tcode) - { - AuthRecord tsig; - mDNSu8 *rdata, *const countPtr = (mDNSu8 *)&msg->h.numAdditionals; // Get existing numAdditionals value - mDNSu32 utc32; - mDNSu8 utc48[6]; - mDNSu8 digest[MD5_LEN]; - mDNSu8 *ptr = *end; - mDNSu32 len; - mDNSOpaque16 buf; - MD5_CTX c; - mDNSu16 numAdditionals = (mDNSu16)((mDNSu16)countPtr[0] << 8 | countPtr[1]); - - // Init MD5 context, digest inner key pad and message - MD5_Init(&c); - MD5_Update(&c, info->keydata_ipad, HMAC_LEN); - MD5_Update(&c, (mDNSu8 *)msg, (unsigned long)(*end - (mDNSu8 *)msg)); - - // Construct TSIG RR, digesting variables as apporpriate - mDNS_SetupResourceRecord(&tsig, mDNSNULL, 0, kDNSType_TSIG, 0, kDNSRecordTypeKnownUnique, AuthRecordAny, mDNSNULL, mDNSNULL); - - // key name - AssignDomainName(&tsig.namestorage, &info->keyname); - MD5_Update(&c, info->keyname.c, DomainNameLength(&info->keyname)); - - // class - tsig.resrec.rrclass = kDNSQClass_ANY; - buf = mDNSOpaque16fromIntVal(kDNSQClass_ANY); - MD5_Update(&c, buf.b, sizeof(mDNSOpaque16)); - - // ttl - tsig.resrec.rroriginalttl = 0; - MD5_Update(&c, (mDNSu8 *)&tsig.resrec.rroriginalttl, sizeof(tsig.resrec.rroriginalttl)); - - // alg name - AssignDomainName(&tsig.resrec.rdata->u.name, &HMAC_MD5_AlgName); - len = DomainNameLength(&HMAC_MD5_AlgName); - rdata = tsig.resrec.rdata->u.data + len; - MD5_Update(&c, HMAC_MD5_AlgName.c, len); - - // time - // get UTC (universal time), convert to 48-bit unsigned in network byte order - utc32 = (mDNSu32)mDNSPlatformUTC(); - if (utc32 == (unsigned)-1) { LogMsg("ERROR: DNSDigest_SignMessage - mDNSPlatformUTC returned bad time -1"); *end = mDNSNULL; } - utc48[0] = 0; - utc48[1] = 0; - utc48[2] = (mDNSu8)((utc32 >> 24) & 0xff); - utc48[3] = (mDNSu8)((utc32 >> 16) & 0xff); - utc48[4] = (mDNSu8)((utc32 >> 8) & 0xff); - utc48[5] = (mDNSu8)( utc32 & 0xff); - - mDNSPlatformMemCopy(rdata, utc48, 6); - rdata += 6; - MD5_Update(&c, utc48, 6); - - // 300 sec is fudge recommended in RFC 2485 - rdata[0] = (mDNSu8)((300 >> 8) & 0xff); - rdata[1] = (mDNSu8)( 300 & 0xff); - MD5_Update(&c, rdata, sizeof(mDNSOpaque16)); - rdata += sizeof(mDNSOpaque16); - - // digest error (tcode) and other data len (zero) - we'll add them to the rdata later - buf.b[0] = (mDNSu8)((tcode >> 8) & 0xff); - buf.b[1] = (mDNSu8)( tcode & 0xff); - MD5_Update(&c, buf.b, sizeof(mDNSOpaque16)); // error - buf.NotAnInteger = 0; - MD5_Update(&c, buf.b, sizeof(mDNSOpaque16)); // other data len - - // finish the message & tsig var hash - MD5_Final(digest, &c); - - // perform outer MD5 (outer key pad, inner digest) - MD5_Init(&c); - MD5_Update(&c, info->keydata_opad, HMAC_LEN); - MD5_Update(&c, digest, MD5_LEN); - MD5_Final(digest, &c); - - // set remaining rdata fields - rdata[0] = (mDNSu8)((MD5_LEN >> 8) & 0xff); - rdata[1] = (mDNSu8)( MD5_LEN & 0xff); - rdata += sizeof(mDNSOpaque16); - mDNSPlatformMemCopy(rdata, digest, MD5_LEN); // MAC - rdata += MD5_LEN; - rdata[0] = msg->h.id.b[0]; // original ID - rdata[1] = msg->h.id.b[1]; - rdata[2] = (mDNSu8)((tcode >> 8) & 0xff); - rdata[3] = (mDNSu8)( tcode & 0xff); - rdata[4] = 0; // other data len - rdata[5] = 0; - rdata += 6; - - tsig.resrec.rdlength = (mDNSu16)(rdata - tsig.resrec.rdata->u.data); - *end = PutResourceRecordTTLJumbo(msg, ptr, &numAdditionals, &tsig.resrec, 0); - if (!*end) { LogMsg("ERROR: DNSDigest_SignMessage - could not put TSIG"); *end = mDNSNULL; return; } - - // Write back updated numAdditionals value - countPtr[0] = (mDNSu8)(numAdditionals >> 8); - countPtr[1] = (mDNSu8)(numAdditionals & 0xFF); - } - -mDNSexport mDNSBool DNSDigest_VerifyMessage(DNSMessage *msg, mDNSu8 *end, LargeCacheRecord * lcr, DomainAuthInfo *info, mDNSu16 * rcode, mDNSu16 * tcode) - { - mDNSu8 * ptr = (mDNSu8*) &lcr->r.resrec.rdata->u.data; - mDNSs32 now; - mDNSs32 then; - mDNSu8 thisDigest[MD5_LEN]; - mDNSu8 thatDigest[MD5_LEN]; - mDNSu32 macsize; - mDNSOpaque16 buf; - mDNSu8 utc48[6]; - mDNSs32 delta; - mDNSu16 fudge; - domainname * algo; - MD5_CTX c; - mDNSBool ok = mDNSfalse; - - // We only support HMAC-MD5 for now - - algo = (domainname*) ptr; - - if (!SameDomainName(algo, &HMAC_MD5_AlgName)) - { - LogMsg("ERROR: DNSDigest_VerifyMessage - TSIG algorithm not supported: %##s", algo->c); - *rcode = kDNSFlag1_RC_NotAuth; - *tcode = TSIG_ErrBadKey; - ok = mDNSfalse; - goto exit; - } - - ptr += DomainNameLength(algo); - - // Check the times - - now = mDNSPlatformUTC(); - if (now == -1) - { - LogMsg("ERROR: DNSDigest_VerifyMessage - mDNSPlatformUTC returned bad time -1"); - *rcode = kDNSFlag1_RC_NotAuth; - *tcode = TSIG_ErrBadTime; - ok = mDNSfalse; - goto exit; - } - - // Get the 48 bit time field, skipping over the first word - - utc48[0] = *ptr++; - utc48[1] = *ptr++; - utc48[2] = *ptr++; - utc48[3] = *ptr++; - utc48[4] = *ptr++; - utc48[5] = *ptr++; - - then = (mDNSs32)NToH32(utc48 + sizeof(mDNSu16)); - - fudge = NToH16(ptr); - - ptr += sizeof(mDNSu16); - - delta = (now > then) ? now - then : then - now; - - if (delta > fudge) - { - LogMsg("ERROR: DNSDigest_VerifyMessage - time skew > %d", fudge); - *rcode = kDNSFlag1_RC_NotAuth; - *tcode = TSIG_ErrBadTime; - ok = mDNSfalse; - goto exit; - } - - // MAC size - - macsize = (mDNSu32) NToH16(ptr); - - ptr += sizeof(mDNSu16); - - // MAC - - mDNSPlatformMemCopy(thatDigest, ptr, MD5_LEN); - - // Init MD5 context, digest inner key pad and message - - MD5_Init(&c); - MD5_Update(&c, info->keydata_ipad, HMAC_LEN); - MD5_Update(&c, (mDNSu8*) msg, (unsigned long)(end - (mDNSu8*) msg)); - - // Key name - - MD5_Update(&c, lcr->r.resrec.name->c, DomainNameLength(lcr->r.resrec.name)); - - // Class name - - buf = mDNSOpaque16fromIntVal(lcr->r.resrec.rrclass); - MD5_Update(&c, buf.b, sizeof(mDNSOpaque16)); - - // TTL - - MD5_Update(&c, (mDNSu8*) &lcr->r.resrec.rroriginalttl, sizeof(lcr->r.resrec.rroriginalttl)); - - // Algorithm - - MD5_Update(&c, algo->c, DomainNameLength(algo)); - - // Time - - MD5_Update(&c, utc48, 6); - - // Fudge - - buf = mDNSOpaque16fromIntVal(fudge); - MD5_Update(&c, buf.b, sizeof(mDNSOpaque16)); - - // Digest error and other data len (both zero) - we'll add them to the rdata later - - buf.NotAnInteger = 0; - MD5_Update(&c, buf.b, sizeof(mDNSOpaque16)); // error - MD5_Update(&c, buf.b, sizeof(mDNSOpaque16)); // other data len - - // Finish the message & tsig var hash - - MD5_Final(thisDigest, &c); - - // perform outer MD5 (outer key pad, inner digest) - - MD5_Init(&c); - MD5_Update(&c, info->keydata_opad, HMAC_LEN); - MD5_Update(&c, thisDigest, MD5_LEN); - MD5_Final(thisDigest, &c); - - if (!mDNSPlatformMemSame(thisDigest, thatDigest, MD5_LEN)) - { - LogMsg("ERROR: DNSDigest_VerifyMessage - bad signature"); - *rcode = kDNSFlag1_RC_NotAuth; - *tcode = TSIG_ErrBadSig; - ok = mDNSfalse; - goto exit; - } - - // set remaining rdata fields - ok = mDNStrue; - -exit: - - return ok; - } - - -#ifdef __cplusplus -} -#endif diff --git a/src/tools/mdnssd/DebugServices.h b/src/tools/mdnssd/DebugServices.h deleted file mode 100644 index d4e5c7203d..0000000000 --- a/src/tools/mdnssd/DebugServices.h +++ /dev/null @@ -1,1607 +0,0 @@ -/* -*- Mode: C; tab-width: 4 -*- - * - * Copyright (c) 1997-2004 Apple Computer, Inc. All rights reserved. - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @header DebugServices - - Debugging Library -*/ - -#ifndef __DEBUG_SERVICES__ -#define __DEBUG_SERVICES__ - -#include - -#include "CommonServices.h" - -#if( TARGET_OS_VXWORKS ) - #include "logLib.h" -#endif - -#if 0 -#pragma mark == Settings == -#endif - -//=========================================================================================================================== -// Settings -//=========================================================================================================================== - -// General - -#if( !defined( DEBUG ) ) - #define DEBUG 0 -#endif - -#if( defined( NDEBUG ) && DEBUG ) - #error NDEBUG defined and DEBUG is also enabled...they need to be in-sync -#endif - -// AssertMacros.h/Debugging.h overrides. - -#if( !defined( DEBUG_OVERRIDE_APPLE_MACROS ) ) - #define DEBUG_OVERRIDE_APPLE_MACROS 1 -#endif - -// Routine name. Uses ISO __func__ where possible. Otherwise, uses the best thing that is available (if anything). - -#if( defined( __MWERKS__ ) || ( __GNUC__ > 2 ) || ( ( __GNUC__ == 2 ) && ( __GNUC_MINOR__ >= 9 ) ) ) - #define __ROUTINE__ __func__ -#elif( defined( __GNUC__ ) ) - #define __ROUTINE__ __PRETTY_FUNCTION__ -#elif( defined( _MSC_VER ) && !defined( _WIN32_WCE ) ) - #define __ROUTINE__ __FUNCTION__ -#else - #define __ROUTINE__ "" -#endif - -// Variable argument macro support. Use ANSI C99 __VA_ARGS__ where possible. Otherwise, use the next best thing. - -#if( defined( __GNUC__ ) ) - #if( ( __GNUC__ > 3 ) || ( ( __GNUC__ == 3 ) && ( __GNUC_MINOR__ >= 3) ) ) - #define DEBUG_C99_VA_ARGS 1 - #define DEBUG_GNU_VA_ARGS 0 - #else - #define DEBUG_C99_VA_ARGS 0 - #define DEBUG_GNU_VA_ARGS 1 - #endif -#elif( defined( __MWERKS__ ) ) - #define DEBUG_C99_VA_ARGS 1 - #define DEBUG_GNU_VA_ARGS 0 -#else - #define DEBUG_C99_VA_ARGS 0 - #define DEBUG_GNU_VA_ARGS 0 -#endif - -#if 0 -#pragma mark == Output == -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined DEBUG_FPRINTF_ENABLED - - @abstract Enables ANSI C fprintf output. -*/ - -#if( !defined( DEBUG_FPRINTF_ENABLED ) ) - #if( !TARGET_API_MAC_OSX_KERNEL && !TARGET_OS_WINDOWS_CE ) - #define DEBUG_FPRINTF_ENABLED 1 - #else - #define DEBUG_FPRINTF_ENABLED 0 - #endif -#else - #if( TARGET_API_MAC_OSX_KERNEL || TARGET_OS_WINDOWS_CE ) - #error fprintf enabled, but not supported on Mac OS X kernel or Windows CE - #endif -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined DEBUG_MAC_OS_X_IOLOG_ENABLED - - @abstract Enables IOLog (Mac OS X Kernel) output. -*/ - -#if( !defined( DEBUG_MAC_OS_X_IOLOG_ENABLED ) ) - #define DEBUG_MAC_OS_X_IOLOG_ENABLED TARGET_API_MAC_OSX_KERNEL -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined DEBUG_KPRINTF_ENABLED - - @abstract Enables kprintf (Mac OS X Kernel) output. -*/ - -#if( !defined( DEBUG_KPRINTF_ENABLED ) ) - #define DEBUG_KPRINTF_ENABLED TARGET_API_MAC_OSX_KERNEL -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined DEBUG_IDEBUG_ENABLED - - @abstract Enables iDebug (Mac OS X user and Kernel) output. - - @discussion - - For Mac OS X kernel development, iDebug is enabled by default because we can dynamically check for the presence - of iDebug via some exported IOKit symbols. Mac OS X app usage doesn't allow dynamic detection because it relies - on statically linking to the iDebugServices.cp file so for Mac OS X app usage, you have to manually enable iDebug. -*/ - -#if( !defined( DEBUG_IDEBUG_ENABLED ) ) - #define DEBUG_IDEBUG_ENABLED TARGET_API_MAC_OSX_KERNEL -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined DEBUG_CORE_SERVICE_ASSERTS_ENABLED - - @abstract Controls whether Core Services assert handling is enabled. Enabling requires CoreServices framework. -*/ - -#if( !defined( DEBUG_CORE_SERVICE_ASSERTS_ENABLED ) ) - #if( defined( __DEBUGGING__ ) ) - #define DEBUG_CORE_SERVICE_ASSERTS_ENABLED 1 - #else - #define DEBUG_CORE_SERVICE_ASSERTS_ENABLED 0 - #endif -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @typedef DebugOutputType - - @abstract Type of debug output (i.e. where the output goes). -*/ - -typedef uint32_t DebugOutputType; - -#define kDebugOutputTypeNone 0x6E6F6E65U // 'none' - no params -#define kDebugOutputTypeCustom 0x63757374U // 'cust' - 1st param = function ptr, 2nd param = context -#define kDebugOutputTypeFPrintF 0x66707269U // 'fpri' - 1st param = DebugOutputTypeFlags [, 2nd param = filename] -#define kDebugOutputTypeiDebug 0x69646267U // 'idbg' - no params -#define kDebugOutputTypeKPrintF 0x6B707266U // 'kprf' - no params -#define kDebugOutputTypeMacOSXIOLog 0x696C6F67U // 'ilog' - no params -#define kDebugOutputTypeMacOSXLog 0x786C6F67U // 'xlog' - no params -#define kDebugOutputTypeWindowsDebugger 0x77696E64U // 'wind' - no params -#define kDebugOutputTypeWindowsEventLog 0x7765766CU // 'wevl' - 1st param = C-string name, 2nd param = HMODULE or NULL. - -// Console meta output kind - Any kind of Console output (in horizontal order of preference): -// -// Mac OS X = ANSI printf (viewable in Console.app) -// Mac OS X Kernel = IOLog (/var/log/system.log) or kprintf (serial). -// Windows = ANSI printf (Console window) or OutputDebugString (debugger). -// Other = ANSI printf (viewer varies). - -#define kDebugOutputTypeMetaConsole 0x434F4E53U // 'CONS' - no params - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @typedef DebugOutputTypeFlags - - @abstract Flags controlling how the output type is configured. - - @constant kDebugOutputTypeFlagsTypeMask Bit mask for the output type (e.g. stdout, stderr, file, etc.). - @constant kDebugOutputTypeFlagsStdOut fprintf should go to stdout. - @constant kDebugOutputTypeFlagsStdErr fprintf should go to stderr. - @constant kDebugOutputTypeFlagsFile fprintf should go to a specific file (filename passed as va_arg). -*/ - -typedef unsigned int DebugOutputTypeFlags; - -#define kDebugOutputTypeFlagsTypeMask 0xF -#define kDebugOutputTypeFlagsStdOut 1 -#define kDebugOutputTypeFlagsStdErr 2 -#define kDebugOutputTypeFlagsFile 10 - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @typedef DebugOutputFunctionPtr - - @abstract Function ptr for a custom callback to print debug output. -*/ - -typedef void ( *DebugOutputFunctionPtr )( char *inData, size_t inSize, void *inContext ); - -//=========================================================================================================================== -// Constants -//=========================================================================================================================== - -#if 0 -#pragma mark == Flags == -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @typedef DebugFlags - - @abstract Flags controlling how output is printed. -*/ - -typedef uint32_t DebugFlags; - -#define kDebugFlagsNone 0 -#define kDebugFlagsNoAddress ( 1 << 0 ) -#define kDebugFlagsNoOffset ( 1 << 1 ) -#define kDebugFlags32BitOffset ( 1 << 2 ) -#define kDebugFlagsNoASCII ( 1 << 3 ) -#define kDebugFlagsNoNewLine ( 1 << 4 ) -#define kDebugFlags8BitSeparator ( 1 << 5 ) -#define kDebugFlags16BitSeparator ( 1 << 6 ) -#define kDebugFlagsNo32BitSeparator ( 1 << 7 ) -#define kDebugFlagsNo16ByteHexPad ( 1 << 8 ) -#define kDebugFlagsNoByteCount ( 1 << 9 ) - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @enum DebugTaskLevelFlags - - @abstract Flags indicating the task level. -*/ - -enum -{ - kDebugInterruptLevelShift = 0, - kDebugInterruptLevelMask = 0x00000007, - kDebugInVBLTaskMask = 0x00000010, - kDebugInDeferredTaskMask = 0x00000020, - kDebugInSecondaryInterruptHandlerMask = 0x00000040, - kDebugPageFaultFatalMask = 0x00000100, // There should be a "kPageFaultFatalMask" in Debugging.h. - kDebugMPTaskLevelMask = 0x00000200, // There should be a "kMPTaskLevelMask" in Debugging.h. - kDebugInterruptDepthShift = 16, - kDebugInterruptDepthMask = 0x00FF0000 -}; - -#define DebugExtractTaskLevelInterruptLevel( LEVEL ) \ - ( ( ( LEVEL ) & kDebugInterruptLevelMask ) >> kDebugInterruptLevelShift ) - -#define DebugExtractTaskLevelInterruptDepth( LEVEL ) \ - ( ( ( LEVEL ) & kDebugInterruptDepthMask ) >> kDebugInterruptDepthShift ) - -#if 0 -#pragma mark == Levels == -#endif - -//=========================================================================================================================== -// Constants & Types - Levels -//=========================================================================================================================== - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @typedef DebugLevel - - @abstract Level used to control debug logging. -*/ - -typedef int32_t DebugLevel; - -// Levels - -#define kDebugLevelMask 0x0000FFFF -#define kDebugLevelChatty 100 -#define kDebugLevelVerbose 500 -#define kDebugLevelTrace 800 -#define kDebugLevelInfo 1000 -#define kDebugLevelNotice 3000 -#define kDebugLevelWarning 5000 -#define kDebugLevelAssert 6000 -#define kDebugLevelRequire 7000 -#define kDebugLevelError 8000 -#define kDebugLevelCritical 9000 -#define kDebugLevelAlert 10000 -#define kDebugLevelEmergency 11000 -#define kDebugLevelTragic 12000 -#define kDebugLevelMax 0x0000FFFF - -// Level Flags - -#define kDebugLevelFlagMask 0xFFFF0000 -#define kDebugLevelFlagStackTrace 0x00010000 -#define kDebugLevelFlagDebugBreak 0x00020000 - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @typedef LogLevel - - @abstract Level used to control which events are logged. -*/ - -typedef int32_t LogLevel; - -#define kLogLevelUninitialized -1L -#define kLogLevelAll 0L -#define kLogLevelChatty 100L -#define kLogLevelVerbose 500L -#define kLogLevelTrace 800L -#define kLogLevelInfo 1000L -#define kLogLevelNotice 3000L -#define kLogLevelWarning 4000L -#define kLogLevelAssert 6000L -#define kLogLevelRequire 7000L -#define kLogLevelError 8000L -#define kLogLevelCritical 9000L -#define kLogLevelAlert 10000L -#define kLogLevelEmergency 11000L -#define kLogLevelTragic 12000L -#define kLogLevelOff 0x0000FFFEL - -#if 0 -#pragma mark == Properties == -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @typedef DebugPropertyTag - - @abstract Tag for properties. -*/ - -typedef uint32_t DebugPropertyTag; - -#define kDebugPropertyTagPrintLevelMin 0x6D696E70U // 'minp' Get: 1st param = DebugLevel * - // Set: 1st param = DebugLevel - -#define kDebugPropertyTagPrintLevel kDebugPropertyTagPrintLevelMin - -#define kDebugPropertyTagPrintLevelMax 0x706D786CU // 'maxp' Get: 1st param = DebugLevel * - // Set: 1st param = DebugLevel - -#define kDebugPropertyTagBreakLevel 0x62726B6CU // 'brkl' Get: 1st param = DebugLevel * - // Set: 1st param = DebugLevel -#if 0 -#pragma mark == General macros == -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined DEBUG_UNUSED - - @abstract Macro to mark a paramter as unused to avoid unused parameter warnings. - - @discussion - - There is no universally supported pragma/attribute for indicating a variable is unused. DEBUG_UNUSED lets us - indicate a variable is unused in a manner that is supported by most compilers. -*/ - -#define DEBUG_UNUSED( X ) (void)( X ) - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined DEBUG_USE_ONLY - - @abstract Macro to mark a variable as used only when debugging is enabled. - - @discussion - - Variables are sometimes needed only for debugging. When debugging is turned off, these debug-only variables generate - compiler warnings about unused variables. To eliminate these warnings, use these macros to indicate variables that - are only used for debugging. -*/ - -#if( DEBUG ) - #define DEBUG_USE_ONLY( X ) -#else - #define DEBUG_USE_ONLY( X ) (void)( X ) -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined DEBUG_LOCAL - - @abstract Macros to make variables and functions static when debugging is off, but extern when debugging is on. - - @discussion - - Rather than using "static" directly, using this macros allows you to access these variables external while - debugging without being penalized for production builds. -*/ - -#if( DEBUG ) - #define DEBUG_LOCAL -#else - #define DEBUG_LOCAL static -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined DEBUG_STATIC - - @abstract Macros to make variables and functions static when debugging is off, but extern when debugging is on. - - @discussion - - Rather than using "static" directly, using this macros allows you to access these variables external while - debugging without being penalized for production builds. -*/ - -#if( DEBUG ) - #define DEBUG_STATIC -#else - #define DEBUG_STATIC static -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined DEBUG_EXPORT - - @abstract Macros to export variables. - - @discussion - - "__private_extern__" is a hack for IOKit to allow symbols to be exported from compilation units, but - // not exported outside a driver (IOKit uses a lame global namespace for symbols). This still does not - // solve the problem of multiple drivers in the same dependency chain since they share symbols. -*/ - -#if( TARGET_API_MAC_OSX_KERNEL ) - #define DEBUG_EXPORT __private_extern__ -#else - #define DEBUG_EXPORT extern -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined debug_add - - @abstract Macro to add (or subtract if negative) a value when debugging is on. Does nothing if debugging is off. -*/ - -#if( DEBUG ) - #define debug_add( A, B ) ( A ) += ( B ) -#else - #define debug_add( A, B ) -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined debug_perform - - @abstract Macro to perform something in debug-only builds. -*/ - -#if( DEBUG ) - #define debug_perform( X ) do { X; } while( 0 ) -#else - #define debug_perform( X ) -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @function translate_errno - - @abstract Returns 0 if the test success. If the test fails, returns errno if non-zero and othewise the alternate error. -*/ - -#define translate_errno( TEST, ERRNO, ALTERNATE_ERROR ) ( ( TEST ) ? 0 : ( ERRNO ) ? ( ERRNO ) : ( ALTERNATE_ERROR ) ) - -#if 0 -#pragma mark == Compile Time macros == -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined check_compile_time - - @abstract Performs a compile-time check of something such as the size of an int. - - @discussion - - This declares an array with a size that is determined by a compile-time expression. If the expression evaluates - to 0, the array has a size of -1, which is illegal and generates a compile-time error. - - For example: - - check_compile_time( sizeof( int ) == 4 ); - - Note: This only works with compile-time expressions. - Note: This only works in places where extern declarations are allowed (e.g. global scope). - - References: - - - - - Note: The following macros differ from the macros on the www.jaggersoft.com web site because those versions do not - work with GCC due to GCC allow a zero-length array. Using a -1 condition turned out to be more portable. -*/ - -#define check_compile_time( X ) extern int debug_compile_time_name[ ( X ) ? 1 : -1 ] - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined check_compile_time_code - - @abstract Perform a compile-time check, suitable for placement in code, of something such as the size of an int. - - @discussion - - This creates a switch statement with an existing case for 0 and an additional case using the result of a - compile-time expression. A switch statement cannot have two case labels with the same constant so if the - compile-time expression evaluates to 0, it is illegal and generates a compile-time error. If the compile-time - expression does not evaluate to 0, the resulting value is used as the case label and it compiles without error. - - For example: - - check_compile_time_code( sizeof( int ) == 4 ); - - Note: This only works with compile-time expressions. - Note: This does not work in a global scope so it must be inside a function. - - References: - - - -*/ - -#define check_compile_time_code( X ) switch( 0 ) { case 0: case X:; } - -#if 0 -#pragma mark == check macros == -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined check - - @abstract Check that an expression is true (non-zero). - - @discussion - - If expression evalulates to false, this prints debugging information (actual expression string, file, line number, - function name, etc.) using the default debugging output method. - - Code inside check() statements is not compiled into production builds. -*/ - -#if( DEBUG_OVERRIDE_APPLE_MACROS ) - #undef check -#endif -#if( !defined( check ) ) - #if( DEBUG ) - #define check( X ) \ - do \ - { \ - if( !( X ) ) \ - { \ - debug_print_assert( 0, #X, NULL, __FILE__, __LINE__, __ROUTINE__ ); \ - } \ - } while( 0 ) - #else - #define check( X ) - #endif -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined check_string - - @abstract Check that an expression is true (non-zero) with an explanation. - - @discussion - - If expression evalulates to false, this prints debugging information (actual expression string, file, line number, - function name, etc.) and a custom explanation string using the default debugging output method. - - Code inside check_string() statements is not compiled into production builds. -*/ - -#if( DEBUG_OVERRIDE_APPLE_MACROS ) - #undef check_string -#endif -#if( !defined( check_string ) ) - #if( DEBUG ) - #define check_string( X, STR ) \ - do \ - { \ - if( !( X ) ) \ - { \ - debug_print_assert( 0, #X, STR, __FILE__, __LINE__, __ROUTINE__ ); \ - } \ - \ - } while( 0 ) - #else - #define check_string( X, STR ) - #endif -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined check_noerr - - @abstract Check that an error code is noErr (0). - - @discussion - - If the error code is non-0, this prints debugging information (actual expression string, file, line number, - function name, etc.) using the default debugging output method. - - Code inside check_noerr() statements is not compiled into production builds. -*/ - -#if( DEBUG_OVERRIDE_APPLE_MACROS ) - #undef check_noerr -#endif -#if( !defined( check_noerr ) ) - #if( DEBUG ) - #define check_noerr( ERR ) \ - do \ - { \ - int_least32_t localErr; \ - \ - localErr = (int_least32_t)( ERR ); \ - if( localErr != 0 ) \ - { \ - debug_print_assert( localErr, NULL, NULL, __FILE__, __LINE__, __ROUTINE__ ); \ - } \ - \ - } while( 0 ) - #else - #define check_noerr( ERR ) - #endif -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined check_noerr_string - - @abstract Check that an error code is noErr (0) with an explanation. - - @discussion - - If the error code is non-0, this prints debugging information (actual expression string, file, line number, - function name, etc.) and a custom explanation string using the default debugging output method. - - Code inside check_noerr_string() statements is not compiled into production builds. -*/ - -#if( DEBUG_OVERRIDE_APPLE_MACROS ) - #undef check_noerr_string -#endif -#if( !defined( check_noerr_string ) ) - #if( DEBUG ) - #define check_noerr_string( ERR, STR ) \ - do \ - { \ - int_least32_t localErr; \ - \ - localErr = (int_least32_t)( ERR ); \ - if( localErr != 0 ) \ - { \ - debug_print_assert( localErr, NULL, STR, __FILE__, __LINE__, __ROUTINE__ ); \ - } \ - \ - } while( 0 ) - #else - #define check_noerr_string( ERR, STR ) - #endif -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined check_translated_errno - - @abstract Check a condition and prints errno (if non-zero) to the log. - - @discussion - - Code inside check_translated_errno() statements is not compiled into production builds. -*/ - -#if( !defined( check_translated_errno ) ) - #if( DEBUG ) - #define check_translated_errno( TEST, ERRNO, ALTERNATE_ERROR ) \ - do \ - { \ - if( !( TEST ) ) \ - { \ - int_least32_t localErr; \ - \ - localErr = (int_least32_t)( ERRNO ); \ - localErr = ( localErr != 0 ) ? localErr : (int_least32_t)( ALTERNATE_ERROR ); \ - debug_print_assert( localErr, #TEST, NULL, __FILE__, __LINE__, __ROUTINE__ ); \ - } \ - \ - } while( 0 ) - #else - #define check_translated_errno( TEST, ERRNO, ALTERNATE_ERROR ) - #endif -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined check_ptr_overlap - - @abstract Checks that two ptrs do not overlap. -*/ - -#define check_ptr_overlap( P1, P1_SIZE, P2, P2_SIZE ) \ - do \ - { \ - check( !( ( (uintptr_t)( P1 ) >= (uintptr_t)( P2 ) ) && \ - ( (uintptr_t)( P1 ) < ( ( (uintptr_t)( P2 ) ) + ( P2_SIZE ) ) ) ) ); \ - check( !( ( (uintptr_t)( P2 ) >= (uintptr_t)( P1 ) ) && \ - ( (uintptr_t)( P2 ) < ( ( (uintptr_t)( P1 ) ) + ( P1_SIZE ) ) ) ) ); \ - \ - } while( 0 ) - -#if 0 -#pragma mark == require macros == -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined require - - @abstract Requires that an expression evaluate to true. - - @discussion - - If expression evalulates to false, this prints debugging information (actual expression string, file, line number, - function name, etc.) using the default debugging output method then jumps to a label. -*/ - -#if( DEBUG_OVERRIDE_APPLE_MACROS ) - #undef require -#endif -#if( !defined( require ) ) - #define require( X, LABEL ) \ - do \ - { \ - if( !( X ) ) \ - { \ - debug_print_assert( 0, #X, NULL, __FILE__, __LINE__, __ROUTINE__ ); \ - goto LABEL; \ - } \ - \ - } while( 0 ) -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined require_string - - @abstract Requires that an expression evaluate to true with an explanation. - - @discussion - - If expression evalulates to false, this prints debugging information (actual expression string, file, line number, - function name, etc.) and a custom explanation string using the default debugging output method then jumps to a label. -*/ - -#if( DEBUG_OVERRIDE_APPLE_MACROS ) - #undef require_string -#endif -#if( !defined( require_string ) ) - #define require_string( X, LABEL, STR ) \ - do \ - { \ - if( !( X ) ) \ - { \ - debug_print_assert( 0, #X, STR, __FILE__, __LINE__, __ROUTINE__ ); \ - goto LABEL; \ - } \ - \ - } while( 0 ) -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined require_quiet - - @abstract Requires that an expression evaluate to true. - - @discussion - - If expression evalulates to false, this jumps to a label. No debugging information is printed. -*/ - -#if( DEBUG_OVERRIDE_APPLE_MACROS ) - #undef require_quiet -#endif -#if( !defined( require_quiet ) ) - #define require_quiet( X, LABEL ) \ - do \ - { \ - if( !( X ) ) \ - { \ - goto LABEL; \ - } \ - \ - } while( 0 ) -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined require_noerr - - @abstract Require that an error code is noErr (0). - - @discussion - - If the error code is non-0, this prints debugging information (actual expression string, file, line number, - function name, etc.) using the default debugging output method then jumps to a label. -*/ - -#if( DEBUG_OVERRIDE_APPLE_MACROS ) - #undef require_noerr -#endif -#if( !defined( require_noerr ) ) - #define require_noerr( ERR, LABEL ) \ - do \ - { \ - int_least32_t localErr; \ - \ - localErr = (int_least32_t)( ERR ); \ - if( localErr != 0 ) \ - { \ - debug_print_assert( localErr, NULL, NULL, __FILE__, __LINE__, __ROUTINE__ ); \ - goto LABEL; \ - } \ - \ - } while( 0 ) -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined require_noerr_string - - @abstract Require that an error code is noErr (0). - - @discussion - - If the error code is non-0, this prints debugging information (actual expression string, file, line number, - function name, etc.), and a custom explanation string using the default debugging output method using the - default debugging output method then jumps to a label. -*/ - -#if( DEBUG_OVERRIDE_APPLE_MACROS ) - #undef require_noerr_string -#endif -#if( !defined( require_noerr_string ) ) - #define require_noerr_string( ERR, LABEL, STR ) \ - do \ - { \ - int_least32_t localErr; \ - \ - localErr = (int_least32_t)( ERR ); \ - if( localErr != 0 ) \ - { \ - debug_print_assert( localErr, NULL, STR, __FILE__, __LINE__, __ROUTINE__ ); \ - goto LABEL; \ - } \ - \ - } while( 0 ) -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined require_noerr_action_string - - @abstract Require that an error code is noErr (0). - - @discussion - - If the error code is non-0, this prints debugging information (actual expression string, file, line number, - function name, etc.), and a custom explanation string using the default debugging output method using the - default debugging output method then executes an action and jumps to a label. -*/ - -#if( DEBUG_OVERRIDE_APPLE_MACROS ) - #undef require_noerr_action_string -#endif -#if( !defined( require_noerr_action_string ) ) - #define require_noerr_action_string( ERR, LABEL, ACTION, STR ) \ - do \ - { \ - int_least32_t localErr; \ - \ - localErr = (int_least32_t)( ERR ); \ - if( localErr != 0 ) \ - { \ - debug_print_assert( localErr, NULL, STR, __FILE__, __LINE__, __ROUTINE__ ); \ - { ACTION; } \ - goto LABEL; \ - } \ - \ - } while( 0 ) -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined require_noerr_quiet - - @abstract Require that an error code is noErr (0). - - @discussion - - If the error code is non-0, this jumps to a label. No debugging information is printed. -*/ - -#if( DEBUG_OVERRIDE_APPLE_MACROS ) - #undef require_noerr_quiet -#endif -#if( !defined( require_noerr_quiet ) ) - #define require_noerr_quiet( ERR, LABEL ) \ - do \ - { \ - if( ( ERR ) != 0 ) \ - { \ - goto LABEL; \ - } \ - \ - } while( 0 ) -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined require_noerr_action - - @abstract Require that an error code is noErr (0) with an action to execute otherwise. - - @discussion - - If the error code is non-0, this prints debugging information (actual expression string, file, line number, - function name, etc.) using the default debugging output method then executes an action and jumps to a label. -*/ - -#if( DEBUG_OVERRIDE_APPLE_MACROS ) - #undef require_noerr_action -#endif -#if( !defined( require_noerr_action ) ) - #define require_noerr_action( ERR, LABEL, ACTION ) \ - do \ - { \ - int_least32_t localErr; \ - \ - localErr = (int_least32_t)( ERR ); \ - if( localErr != 0 ) \ - { \ - debug_print_assert( localErr, NULL, NULL, __FILE__, __LINE__, __ROUTINE__ ); \ - { ACTION; } \ - goto LABEL; \ - } \ - \ - } while( 0 ) -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined require_noerr_action_quiet - - @abstract Require that an error code is noErr (0) with an action to execute otherwise. - - @discussion - - If the error code is non-0, this executes an action and jumps to a label. No debugging information is printed. -*/ - -#if( DEBUG_OVERRIDE_APPLE_MACROS ) - #undef require_noerr_action_quiet -#endif -#if( !defined( require_noerr_action_quiet ) ) - #define require_noerr_action_quiet( ERR, LABEL, ACTION ) \ - do \ - { \ - if( ( ERR ) != 0 ) \ - { \ - { ACTION; } \ - goto LABEL; \ - } \ - \ - } while( 0 ) -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined require_action - - @abstract Requires that an expression evaluate to true with an action to execute otherwise. - - @discussion - - If expression evalulates to false, this prints debugging information (actual expression string, file, line number, - function name, etc.) using the default debugging output method then executes an action and jumps to a label. -*/ - -#if( DEBUG_OVERRIDE_APPLE_MACROS ) - #undef require_action -#endif -#if( !defined( require_action ) ) - #define require_action( X, LABEL, ACTION ) \ - do \ - { \ - if( !( X ) ) \ - { \ - debug_print_assert( 0, #X, NULL, __FILE__, __LINE__, __ROUTINE__ ); \ - { ACTION; } \ - goto LABEL; \ - } \ - \ - } while( 0 ) -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined require_action_quiet - - @abstract Requires that an expression evaluate to true with an action to execute otherwise. - - @discussion - - If expression evalulates to false, this executes an action and jumps to a label. No debugging information is printed. -*/ - -#if( DEBUG_OVERRIDE_APPLE_MACROS ) - #undef require_action_quiet -#endif -#if( !defined( require_action_quiet ) ) - #define require_action_quiet( X, LABEL, ACTION ) \ - do \ - { \ - if( !( X ) ) \ - { \ - { ACTION; } \ - goto LABEL; \ - } \ - \ - } while( 0 ) -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined require_action_string - - @abstract Requires that an expression evaluate to true with an explanation and action to execute otherwise. - - @discussion - - If expression evalulates to false, this prints debugging information (actual expression string, file, line number, - function name, etc.) and a custom explanation string using the default debugging output method then executes an - action and jumps to a label. -*/ - -#if( DEBUG_OVERRIDE_APPLE_MACROS ) - #undef require_action_string -#endif -#if( !defined( require_action_string ) ) - #define require_action_string( X, LABEL, ACTION, STR ) \ - do \ - { \ - if( !( X ) ) \ - { \ - debug_print_assert( 0, #X, STR, __FILE__, __LINE__, __ROUTINE__ ); \ - { ACTION; } \ - goto LABEL; \ - } \ - \ - } while( 0 ) - -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined require_throw - - @abstract Requires that an expression evaluates to true or an exception is thrown. - - @discussion - - If the expression evaluates to false, this prints debugging information (actual expression string, file, - line number, function name, etc.) using the default debugging output method then throws an exception. -*/ - -#if( defined( __cplusplus ) ) - #define require_throw( X ) \ - do \ - { \ - if( !( X ) ) \ - { \ - debug_print_assert( 0, #X, NULL, __FILE__, __LINE__, __ROUTINE__ ); \ - throw kUnknownErr; \ - } \ - \ - } while( 0 ) -#endif - -#if 0 -#pragma mark == Design-By-Contract macros == -#endif - -//=========================================================================================================================== -// Design-By-Contract macros -//=========================================================================================================================== - -#define ensure( X ) check( X ) -#define ensure_string( X, STR ) check_string( X, STR ) -#define ensure_noerr( ERR ) check_noerr( ERR ) -#define ensure_noerr_string( ERR, STR ) check_noerr_string( ERR, STR ) -#define ensure_translated_errno( TEST, ERRNO, ALTERNATE_ERROR ) check_translated_errno( TEST, ERRNO, ALTERNATE_ERROR ) - -// Note: Design-By-Contract "require" macros are already defined elsewhere. - -#if 0 -#pragma mark == Expect macros == -#endif - -//=========================================================================================================================== -// Expect macros -//=========================================================================================================================== - -// Expect macros allow code to include runtime checking of things that should not happen in shipping code (e.g. internal -// programmer errors, such as a NULL parameter where it is not allowed). Once the code has been verified to work correctly -// without asserting, the DEBUG_EXPECT_VERIFIED conditional can be set to eliminate the error checking entirely. It can -// also be useful to measure the cost of error checking code by profiling with it enable and with it disabled. - -#if( DEBUG_EXPECT_VERIFIED ) - #define require_expect - #define require_string_expect - #define require_quiet_expect - #define require_noerr_expect - #define require_noerr_string_expect - #define require_noerr_action_string_expect - #define require_noerr_quiet_expect - #define require_noerr_action_expect - #define require_noerr_action_quiet_expect - #define require_action_expect - #define require_action_quiet_expect - #define require_action_string_expect -#else - #define require_expect require - #define require_string_expect require_string - #define require_quiet_expect require_quiet - #define require_noerr_expect require_noerr - #define require_noerr_string_expect require_noerr_string - #define require_noerr_action_string_expect require_noerr_action_string - #define require_noerr_quiet_expect require_noerr_quiet - #define require_noerr_action_expect require_noerr_action - #define require_noerr_action_quiet_expect require_noerr_action_quiet - #define require_action_expect require_action - #define require_action_quiet_expect require_action_quiet - #define require_action_string_expect require_action_string -#endif - -#if 0 -#pragma mark == Output macros == -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined debug_string - - @abstract Prints a debugging C string. -*/ - -#if( DEBUG_OVERRIDE_APPLE_MACROS ) - #undef debug_string -#endif -#if( !defined( debug_string ) ) - #if( DEBUG ) - #define debug_string( STR ) \ - do \ - { \ - debug_print_assert( 0, NULL, STR, __FILE__, __LINE__, __ROUTINE__ ); \ - \ - } while( 0 ) - #else - #define debug_string( STR ) - #endif -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined debug_print_assert - - @abstract Prints an assertion. -*/ - -#if( DEBUG ) - #define debug_print_assert( ERROR_CODE, ASSERT_STRING, MESSAGE, FILENAME, LINE_NUMBER, FUNCTION ) \ - DebugPrintAssert( ERROR_CODE, ASSERT_STRING, MESSAGE, FILENAME, LINE_NUMBER, FUNCTION ) -#else - #define debug_print_assert( ERROR_CODE, ASSERT_STRING, MESSAGE, FILENAME, LINE_NUMBER, FUNCTION ) -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined dlog - - @abstract Prints a debug-only message. -*/ - -#if( DEBUG ) - #if( DEBUG_C99_VA_ARGS ) - #define dlog( ... ) DebugPrintF( __VA_ARGS__ ) - #elif( DEBUG_GNU_VA_ARGS ) - #define dlog( ARGS... ) DebugPrintF( ## ARGS ) - #else - #define dlog DebugPrintF - #endif -#else - #if( DEBUG_C99_VA_ARGS ) - #define dlog( ... ) - #elif( DEBUG_GNU_VA_ARGS ) - #define dlog( ARGS... ) - #else - #define dlog while( 0 ) - #endif -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined dlogv - - @abstract Prints a debug-only message. -*/ - -#if( DEBUG ) - #define dlogv( LEVEL, FORMAT, LIST ) DebugPrintFVAList( ( LEVEL ), ( FORMAT ), ( LIST ) ) -#else - #define dlogv( LEVEL, FORMAT, LIST ) -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined dlogmem - - @abstract Prints a debug-only dump of memory. -*/ - -#if( DEBUG ) - #define dlogmem( LEVEL, PTR, SIZE ) \ - DebugHexDump( ( LEVEL ), 0, NULL, 0, 0, NULL, 0, ( PTR ), ( PTR ), ( SIZE ), kDebugFlagsNone, NULL, 0 ) -#else - #define dlogmem( LEVEL, PTR, SIZE ) -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined DebugNSLog - - @abstract Debug-only macro for the Cocoa NSLog function. -*/ - -#if( DEBUG ) - #if( DEBUG_C99_VA_ARGS ) - #define DebugNSLog( ... ) NSLog( __VA_ARGS__ ) - #elif( DEBUG_GNU_VA_ARGS ) - #define DebugNSLog( ARGS... ) NSLog( ## ARGS ) - #else - #define DebugNSLog NSLog - #endif -#else - #if( DEBUG_C99_VA_ARGS ) - #define DebugNSLog( ... ) - #elif( DEBUG_GNU_VA_ARGS ) - #define DebugNSLog( ARGS... ) - #else - #define DebugNSLog while( 0 ) - #endif -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @defined DebugLogMsg - - @abstract Debug-only macro for the VxWorks logMsg function. -*/ - -#if( TARGET_OS_VXWORKS ) - #if( DEBUG ) - #define DebugLogMsg( LEVEL, FORMAT, P1, P2, P3, P4, P5, P6 ) \ - do \ - { \ - if( ( inLevel >= gDebugPrintLevelMin ) || ( inLevel <= gDebugPrintLevelMax ) ) \ - { \ - logMsg( ( FORMAT ), ( P1 ), ( P2 ), ( P3 ), ( P4 ), ( P5 ), ( P6 ) ); \ - } \ - \ - } while( 0 ) - #else - #define DebugLogMsg( LEVEL, FORMAT, P1, P2, P3, P4, P5, P6 ) - #endif -#else - #define DebugLogMsg dlog -#endif - -#if 0 -#pragma mark == Routines - General == -#endif - -#ifdef __cplusplus - extern "C" { -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @function DebugInitialize - - @abstract Initializes the debugging library for a specific kind of output. - - @param inType - @param varArg Variable number parameters, controlled by the "inType" parameter. -*/ - -#if( DEBUG ) - DEBUG_EXPORT OSStatus DebugInitialize( DebugOutputType inType, ... ); -#endif - -#if( DEBUG ) - #if( DEBUG_C99_VA_ARGS ) - #define debug_initialize( ... ) DebugInitialize( __VA_ARGS__ ) - #elif( DEBUG_GNU_VA_ARGS ) - #define debug_initialize( ARGS... ) DebugInitialize( ## ARGS ) - #else - #define debug_initialize DebugInitialize - #endif -#else - #if( DEBUG_C99_VA_ARGS ) - #define debug_initialize( ... ) - #elif( DEBUG_GNU_VA_ARGS ) - #define debug_initialize( ARGS... ) - #else - #define debug_initialize while( 0 ) - #endif -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @function DebugFinalize - - @abstract Releases any resources used by the debugging library -*/ - -#if( DEBUG ) - DEBUG_EXPORT void DebugFinalize( void ); -#endif - -#if( DEBUG ) - #define debug_terminate() DebugFinalize() -#else - #define debug_terminate() -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @function DebugGetProperty - - @abstract Gets the specified property from the debugging library. -*/ - -#if( DEBUG ) - DEBUG_EXPORT OSStatus DebugGetProperty( DebugPropertyTag inTag, ... ); -#endif - -#if( DEBUG ) - #if( DEBUG_C99_VA_ARGS ) - #define debug_get_property( ... ) DebugGetProperty( __VA_ARGS__ ) - #elif( DEBUG_GNU_VA_ARGS ) - #define debug_get_property( ARGS... ) DebugGetProperty( ## ARGS ) - #else - #define debug_get_property DebugGetProperty - #endif -#else - #if( DEBUG_C99_VA_ARGS ) - #define debug_get_property( ... ) - #elif( DEBUG_GNU_VA_ARGS ) - #define debug_get_property( ARGS... ) - #else - #define debug_get_property while( 0 ) - #endif -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @function DebugSetProperty - - @abstract Sets the specified property from the debugging library. -*/ - -#if( DEBUG ) - DEBUG_EXPORT OSStatus DebugSetProperty( DebugPropertyTag inTag, ... ); -#endif - -#if( DEBUG ) - #if( DEBUG_C99_VA_ARGS ) - #define debug_set_property( ... ) DebugSetProperty( __VA_ARGS__ ) - #elif( DEBUG_GNU_VA_ARGS ) - #define debug_set_property( ARGS... ) DebugSetProperty( ## ARGS ) - #else - #define debug_set_property DebugSetProperty - #endif -#else - #if( DEBUG_C99_VA_ARGS ) - #define debug_set_property( ... ) - #elif( DEBUG_GNU_VA_ARGS ) - #define debug_set_property( ARGS... ) - #else - #define debug_set_property while( 0 ) - #endif -#endif - -#if 0 -#pragma mark == Routines - Debugging Output == -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @function DebugPrintF - - @abstract Prints a debug message with printf-style formatting. - - @param inLevel Error that generated this assert or noErr. - - @param inFormatString - C string containing assertion text. - - @param VAR_ARG - Variable number of arguments depending on the format string. - - @result Number of bytes printed or -1 on error. -*/ - -#if( DEBUG ) - DEBUG_EXPORT size_t DebugPrintF( DebugLevel inLevel, const char *inFormat, ... ); -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @function DebugPrintFVAList - - @abstract va_list version of DebugPrintF. See DebugPrintF for more info. -*/ - -#if( DEBUG ) - DEBUG_EXPORT size_t DebugPrintFVAList( DebugLevel inLevel, const char *inFormat, va_list inArgs ); -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @function DebugPrintAssert - - @abstract Prints a message describing the reason the (e.g. an assert failed), an optional error message, - an optional source filename, an optional source line number. - - @param inErrorCode Error that generated this assert or noErr. - @param inAssertString C string containing assertion text. - @param inMessage C string containing a message about the assert. - @param inFileName C string containing path of file where the error occurred. - @param inLineNumber Line number in source file where the error occurred. - @param inFunction C string containing name of function where assert occurred. - - @discussion - - Example output: - - [ASSERT] assert: "dataPtr != NULL" allocate memory for object failed - [ASSERT] where: "MyFile.c", line 123, ("MyFunction") - - OR - - [ASSERT] error: -6728 (kNoMemoryErr) - [ASSERT] where: "MyFile.c", line 123, ("MyFunction") -*/ - -#if( DEBUG ) - DEBUG_EXPORT void - DebugPrintAssert( - int_least32_t inErrorCode, - const char * inAssertString, - const char * inMessage, - const char * inFilename, - int_least32_t inLineNumber, - const char * inFunction ); -#endif - -#if 0 -#pragma mark == Routines - Utilities == -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @function DebugSNPrintF - - @abstract Debugging versions of standard C snprintf with extra features. - - @param sbuffer Buffer to receive result. Null terminated unless the buffer size is 0. - @param buflen Size of the buffer including space for the null terminator. - @param fmt printf-style format string. - @param VAR_ARG Variable number of arguments depending on the format string. - - @result Number of characters written (minus the null terminator). - - @discussion - - Extra features over the standard C snprintf: - 
-		64-bit support for %d (%lld), %i (%lli), %u (%llu), %o (%llo), %x (%llx), and %b (%llb).
-		%@   - Cocoa/CoreFoundation object. Param is the object. Strings are used directly. Others use CFCopyDescription.
-		%a   - Network Address: %.4a=IPv4, %.6a=Ethernet, %.8a Fibre Channel, %.16a=IPv6. Arg=ptr to network address.
-		%#a  - IPv4 or IPv6 mDNSAddr. Arg=ptr to mDNSAddr.
-		%##a - IPv4 (if AF_INET defined) or IPv6 (if AF_INET6 defined) sockaddr. Arg=ptr to sockaddr.
-		%b   - Binary representation of integer (e.g. 01101011). Modifiers and arg=the same as %d, %x, etc.
-		%C   - Mac-style FourCharCode (e.g. 'APPL'). Arg=32-bit value to print as a Mac-style FourCharCode.
-		%H   - Hex Dump (e.g. "\x6b\xa7" -> "6B A7"). 1st arg=ptr, 2nd arg=size, 3rd arg=max size.
-		%#H  - Hex Dump & ASCII (e.g. "\x41\x62" -> "6B A7 'Ab'"). 1st arg=ptr, 2nd arg=size, 3rd arg=max size.
-		%m   - Error Message (e.g. 0 -> "kNoErr"). Modifiers and error code arg=the same as %d, %x, etc.
-		%#s  - Pascal-style length-prefixed string. Arg=ptr to string.
-		%##s - DNS label-sequence name. Arg=ptr to name.
-		%S   - UTF-16 string, 0x0000 terminated. Host order if no BOM. Precision is UTF-16 count. Precision includes BOM.
-		%#S  - Big Endian UTF-16 string (unless BOM overrides). Otherwise, the same as %S.
-		%##S - Little Endian UTF-16 string (unless BOM overrides). Otherwise, the same as %S.
-		%U   - Universally Unique Identifier (UUID) (e.g. 6ba7b810-9dad-11d1-80b4-00c04fd430c8). Arg=ptr to 16-byte UUID.
-
-*/ - -#if( DEBUG ) - DEBUG_EXPORT size_t DebugSNPrintF(char *sbuffer, size_t buflen, const char *fmt, ...); -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @function DebugSNPrintFVAList - - @abstract va_list version of DebugSNPrintF. See DebugSNPrintF for more info. -*/ - -#if( DEBUG ) - DEBUG_EXPORT size_t DebugSNPrintFVAList(char *sbuffer, size_t buflen, const char *fmt, va_list arg); -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @function DebugGetErrorString - - @abstract Gets an error string from an error code. - - @param inStatus Error code to get the string for. - @param inBuffer Optional buffer to copy the string to for non-static strings. May be null. - @param inBufferSize Size of optional buffer. May be 0. - - @result C string containing error string for the error code. Guaranteed to be a valid, static string. If a - buffer is supplied, the return value will always be a pointer to the supplied buffer, which will - contain the best available description of the error code. If a buffer is not supplied, the return - value will be the best available description of the error code that can be represented as a static - string. This allows code that cannot use a temporary buffer to hold the result to still get a useful - error string in most cases, but also allows code that can use a temporary buffer to get the best - available description. -*/ - -#if( DEBUG ) - DEBUG_EXPORT const char * DebugGetErrorString( int_least32_t inErrorCode, char *inBuffer, size_t inBufferSize ); -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @function DebugHexDump - - @abstract Hex dumps data to a string or to the output device. -*/ - -#if( DEBUG ) - DEBUG_EXPORT size_t - DebugHexDump( - DebugLevel inLevel, - int inIndent, - const char * inLabel, - size_t inLabelSize, - int inLabelMinWidth, - const char * inType, - size_t inTypeSize, - const void * inDataStart, - const void * inData, - size_t inDataSize, - DebugFlags inFlags, - char * outBuffer, - size_t inBufferSize ); -#endif - -#if( DEBUG ) - #define dloghex( LEVEL, INDENT, LABEL, LABEL_SIZE, LABEL_MIN_SIZE, TYPE, TYPE_SIZE, DATA_START, DATA, DATA_SIZE, FLAGS, BUFFER, BUFFER_SIZE ) \ - DebugHexDump( ( LEVEL ), (INDENT), ( LABEL ), ( LABEL_SIZE ), ( LABEL_MIN_SIZE ), ( TYPE ), ( TYPE_SIZE ), \ - ( DATA_START ), ( DATA ), ( DATA_SIZE ), ( FLAGS ), ( BUFFER ), ( BUFFER_SIZE ) ) -#else - #define dloghex( LEVEL, INDENT, LABEL, LABEL_SIZE, LABEL_MIN_SIZE, TYPE, TYPE_SIZE, DATA_START, DATA, DATA_SIZE, FLAGS, BUFFER, BUFFER_SIZE ) -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @function DebugTaskLevel - - @abstract Returns the current task level. - - @result Current task level - - @discussion - - Bit masks to isolate portions of the result (note that some masks may also need bit shifts to right justify): - 
-		kDebugInterruptLevelMask				- Indicates the current interrupt level (> 0 means interrupt time).
-		kDebugInVBLTaskMask						- Indicates if a VBL task is currently being executed.
-		kDebugInDeferredTaskMask				- Indicates if a Deferred Task is currently being executed.
-		kDebugInSecondaryInterruptHandlerMask	- Indicates if a Secondary Interrupt Handler is currently being executed.
-		kDebugPageFaultFatalMask				- Indicates if it is unsafe to cause a page fault (worse than interrupt time).
-		kDebugMPTaskLevelMask					- Indicates if being called from an MP task.
-		kDebugInterruptDepthMask				- 0 means task level, 1 means in interrupt, > 1 means in nested interrupt.
-
- - Helpers: - 
-		DebugExtractTaskLevelInterruptDepth()   - Macro to extract interrupt depth from task level value.
-
-*/ - -#if( DEBUG ) - DEBUG_EXPORT uint32_t DebugTaskLevel( void ); -#endif - -//--------------------------------------------------------------------------------------------------------------------------- -/*! @function DebugServicesTest - - @abstract Unit test. -*/ - -#if( DEBUG ) - DEBUG_EXPORT OSStatus DebugServicesTest( void ); -#endif - -#ifdef __cplusplus - } -#endif - -#endif // __DEBUG_SERVICES__ diff --git a/src/tools/mdnssd/GenLinkedList.c b/src/tools/mdnssd/GenLinkedList.c deleted file mode 100644 index 6e371b9db5..0000000000 --- a/src/tools/mdnssd/GenLinkedList.c +++ /dev/null @@ -1,319 +0,0 @@ -/* -*- Mode: C; tab-width: 4 -*- - * - * Copyright (c) 2003 Apple Computer, Inc. All rights reserved. - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - - File: GenLinkedList.c - - Contains: implementation of generic linked lists. - - Version: 1.0 - Tabs: 4 spaces - */ - -#include "GenLinkedList.h" - - -// Return the link pointer contained within element e at offset o. -#define GETLINK( e, o) ( *(void**)((char*) (e) + (o)) ) - -// Assign the link pointer l to element e at offset o. -#define ASSIGNLINK( e, l, o) ( *((void**)((char*) (e) + (o))) = (l)) - - -// GenLinkedList ///////////////////////////////////////////////////////////// - -void InitLinkedList( GenLinkedList *pList, size_t linkOffset) -/* Initialize the block of memory pointed to by pList as a linked list. */ -{ - pList->Head = NULL; - pList->Tail = NULL; - pList->LinkOffset = linkOffset; -} - - -void AddToTail( GenLinkedList *pList, void *elem) -/* Add a linked list element to the tail of the list. */ -{ - if ( pList->Tail) { - ASSIGNLINK( pList->Tail, elem, pList->LinkOffset); - } else - pList->Head = elem; - ASSIGNLINK( elem, NULL, pList->LinkOffset); - - pList->Tail = elem; -} - - -void AddToHead( GenLinkedList *pList, void *elem) -/* Add a linked list element to the head of the list. */ -{ - ASSIGNLINK( elem, pList->Head, pList->LinkOffset); - if ( pList->Tail == NULL) - pList->Tail = elem; - - pList->Head = elem; -} - - -int RemoveFromList( GenLinkedList *pList, void *elem) -/* Remove a linked list element from the list. Return 0 if it was not found. */ -/* If the element is removed, its link will be set to NULL. */ -{ -void *iElem, *lastElem; - - for ( iElem = pList->Head, lastElem = NULL; iElem; iElem = GETLINK( iElem, pList->LinkOffset)) { - if ( iElem == elem) { - if ( lastElem) { // somewhere past the head - ASSIGNLINK( lastElem, GETLINK( elem, pList->LinkOffset), pList->LinkOffset); - } else { // at the head - pList->Head = GETLINK( elem, pList->LinkOffset); - } - if ( pList->Tail == elem) - pList->Tail = lastElem ? lastElem : NULL; - ASSIGNLINK( elem, NULL, pList->LinkOffset); // maybe catch a stale reference bug. - return 1; - } - lastElem = iElem; - } - - return 0; -} - - -int ReplaceElem( GenLinkedList *pList, void *elemInList, void *newElem) -/* Replace an element in the list with a new element, in the same position. */ -{ -void *iElem, *lastElem; - - if ( elemInList == NULL || newElem == NULL) - return 0; - - for ( iElem = pList->Head, lastElem = NULL; iElem; iElem = GETLINK( iElem, pList->LinkOffset)) - { - if ( iElem == elemInList) - { - ASSIGNLINK( newElem, GETLINK( elemInList, pList->LinkOffset), pList->LinkOffset); - if ( lastElem) // somewhere past the head - { - ASSIGNLINK( lastElem, newElem, pList->LinkOffset); - } - else // at the head - { - pList->Head = newElem; - } - if ( pList->Tail == elemInList) - pList->Tail = newElem; - return 1; - } - lastElem = iElem; - } - - return 0; -} - - -// GenDoubleLinkedList ///////////////////////////////////////////////////////// - -void InitDoubleLinkedList( GenDoubleLinkedList *pList, size_t fwdLinkOffset, - size_t backLinkOffset) -/* Initialize the block of memory pointed to by pList as a double linked list. */ -{ - pList->Head = NULL; - pList->Tail = NULL; - pList->FwdLinkOffset = fwdLinkOffset; - pList->BackLinkOffset = backLinkOffset; -} - - -void DLLAddToHead( GenDoubleLinkedList *pList, void *elem) -/* Add a linked list element to the head of the list. */ -{ -void *pNext; - - pNext = pList->Head; - - // fix up the forward links - ASSIGNLINK( elem, pList->Head, pList->FwdLinkOffset); - pList->Head = elem; - - // fix up the backward links - if ( pNext) { - ASSIGNLINK( pNext, elem, pList->BackLinkOffset); - } else - pList->Tail = elem; - ASSIGNLINK( elem, NULL, pList->BackLinkOffset); -} - - -void DLLRemoveFromList( GenDoubleLinkedList *pList, void *elem) -/* Remove a linked list element from the list. */ -/* When the element is removed, its link will be set to NULL. */ -{ -void *pNext, *pPrev; - - pNext = GETLINK( elem, pList->FwdLinkOffset); - pPrev = GETLINK( elem, pList->BackLinkOffset); - - // fix up the forward links - if ( pPrev) - ASSIGNLINK( pPrev, pNext, pList->FwdLinkOffset); - else - pList->Head = pNext; - - // fix up the backward links - if ( pNext) - ASSIGNLINK( pNext, pPrev, pList->BackLinkOffset); - else - pList->Tail = pPrev; - - ASSIGNLINK( elem, NULL, pList->FwdLinkOffset); - ASSIGNLINK( elem, NULL, pList->BackLinkOffset); -} - - -// GenLinkedOffsetList ///////////////////////////////////////////////////// - -// Extract the Next offset from element -#define GETOFFSET( e, o) ( *(size_t*)((char*) (e) + (o)) ) - -static void AssignOffsetLink( void *elem, void *link, size_t linkOffset); - - -static void AssignOffsetLink( void *elem, void *link, size_t linkOffset) -// Assign link to elem as an offset from elem. Assign 0 to elem if link is NULL. -{ - GETOFFSET( elem, linkOffset) = link ? (size_t) link - (size_t) elem : 0; -} - - -void *GetHeadPtr( GenLinkedOffsetList *pList) -/* Return a pointer to the head element of a list, or NULL if none. */ -{ - return pList->Head ? ( (char*) (pList) + pList->Head) : NULL; -} - - -void *GetTailPtr( GenLinkedOffsetList *pList) -/* Return a pointer to the tail element of a list, or NULL if none. */ -{ - return pList->Tail ? ( (char*) (pList) + pList->Tail) : NULL; -} - - -void *GetOffsetLink( GenLinkedOffsetList *pList, void *elem) -/* Return the link pointer contained within element e for pList, or NULL if it is 0. */ -{ -size_t nextOffset; - - nextOffset = GETOFFSET( elem, pList->LinkOffset); - - return nextOffset ? (char*) elem + nextOffset : NULL; -} - - -void InitLinkedOffsetList( GenLinkedOffsetList *pList, size_t linkOffset) -/* Initialize the block of memory pointed to by pList as a linked list. */ -{ - pList->Head = 0; - pList->Tail = 0; - pList->LinkOffset = linkOffset; -} - - -void OffsetAddToTail( GenLinkedOffsetList *pList, void *elem) -/* Add a linked list element to the tail of the list. */ -{ - if ( pList->Tail) { - AssignOffsetLink( GetTailPtr( pList), elem, pList->LinkOffset); - } else - pList->Head = (size_t) elem - (size_t) pList; - AssignOffsetLink( elem, NULL, pList->LinkOffset); - - pList->Tail = (size_t) elem - (size_t) pList; -} - - -void OffsetAddToHead( GenLinkedOffsetList *pList, void *elem) -/* Add a linked list element to the head of the list. */ -{ - AssignOffsetLink( elem, GetHeadPtr( pList), pList->LinkOffset); - if ( pList->Tail == 0) - pList->Tail = (size_t) elem - (size_t) pList; - - pList->Head = (size_t) elem - (size_t) pList; -} - - -int OffsetRemoveFromList( GenLinkedOffsetList *pList, void *elem) -/* Remove a linked list element from the list. Return 0 if it was not found. */ -/* If the element is removed, its link will be set to NULL. */ -{ -void *iElem, *lastElem; - - for ( iElem = GetHeadPtr( pList), lastElem = NULL; iElem; - iElem = GetOffsetLink( pList, iElem)) - { - if ( iElem == elem) { - if ( lastElem) { // somewhere past the head - AssignOffsetLink( lastElem, GetOffsetLink( pList, elem), pList->LinkOffset); - } else { // at the head - iElem = GetOffsetLink( pList, elem); - pList->Head = iElem ? (size_t) iElem - (size_t) pList : 0; - } - if ( GetTailPtr( pList) == elem) - pList->Tail = lastElem ? (size_t) lastElem - (size_t) pList : 0; - AssignOffsetLink( elem, NULL, pList->LinkOffset); // maybe catch a stale reference bug. - return 1; - } - lastElem = iElem; - } - - return 0; -} - - -int OffsetReplaceElem( GenLinkedOffsetList *pList, void *elemInList, void *newElem) -/* Replace an element in the list with a new element, in the same position. */ -{ -void *iElem, *lastElem; - - if ( elemInList == NULL || newElem == NULL) - return 0; - - for ( iElem = GetHeadPtr( pList), lastElem = NULL; iElem; - iElem = GetOffsetLink( pList, iElem)) - { - if ( iElem == elemInList) - { - AssignOffsetLink( newElem, GetOffsetLink( pList, elemInList), pList->LinkOffset); - if ( lastElem) // somewhere past the head - { - AssignOffsetLink( lastElem, newElem, pList->LinkOffset); - } - else // at the head - { - pList->Head = (size_t) newElem - (size_t) pList; - } - if ( GetTailPtr( pList) == elemInList) - pList->Tail = (size_t) newElem - (size_t) pList; - return 1; - } - lastElem = iElem; - } - - return 0; -} - - diff --git a/src/tools/mdnssd/GenLinkedList.h b/src/tools/mdnssd/GenLinkedList.h deleted file mode 100644 index 4e177083c7..0000000000 --- a/src/tools/mdnssd/GenLinkedList.h +++ /dev/null @@ -1,90 +0,0 @@ -/* -*- Mode: C; tab-width: 4 -*- - * - * Copyright (c) 2003 Apple Computer, Inc. All rights reserved. - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -#ifndef __GenLinkedList__ -#define __GenLinkedList__ - - -#include - - -struct GenLinkedList -{ - void *Head, - *Tail; - size_t LinkOffset; -}; -typedef struct GenLinkedList GenLinkedList; - - -void InitLinkedList( GenLinkedList *pList, size_t linkOffset); - -void AddToHead( GenLinkedList *pList, void *elem); -void AddToTail( GenLinkedList *pList, void *elem); - -int RemoveFromList( GenLinkedList *pList, void *elem); - -int ReplaceElem( GenLinkedList *pList, void *elemInList, void *newElem); - - - -struct GenDoubleLinkedList -{ - void *Head, - *Tail; - size_t FwdLinkOffset, - BackLinkOffset; -}; -typedef struct GenDoubleLinkedList GenDoubleLinkedList; - - -void InitDoubleLinkedList( GenDoubleLinkedList *pList, size_t fwdLinkOffset, - size_t backLinkOffset); - -void DLLAddToHead( GenDoubleLinkedList *pList, void *elem); - -void DLLRemoveFromList( GenDoubleLinkedList *pList, void *elem); - - - -/* A GenLinkedOffsetList is like a GenLinkedList that stores the *Next field as a signed */ -/* offset from the address of the beginning of the element, rather than as a pointer. */ - -struct GenLinkedOffsetList -{ - size_t Head, - Tail; - size_t LinkOffset; -}; -typedef struct GenLinkedOffsetList GenLinkedOffsetList; - - -void InitLinkedOffsetList( GenLinkedOffsetList *pList, size_t linkOffset); - -void *GetHeadPtr( GenLinkedOffsetList *pList); -void *GetTailPtr( GenLinkedOffsetList *pList); -void *GetOffsetLink( GenLinkedOffsetList *pList, void *elem); - -void OffsetAddToHead( GenLinkedOffsetList *pList, void *elem); -void OffsetAddToTail( GenLinkedOffsetList *pList, void *elem); - -int OffsetRemoveFromList( GenLinkedOffsetList *pList, void *elem); - -int OffsetReplaceElem( GenLinkedOffsetList *pList, void *elemInList, void *newElem); - - -#endif // __GenLinkedList__ diff --git a/src/tools/mdnssd/PlatformCommon.c b/src/tools/mdnssd/PlatformCommon.c deleted file mode 100644 index 7a1985aa20..0000000000 --- a/src/tools/mdnssd/PlatformCommon.c +++ /dev/null @@ -1,196 +0,0 @@ -/* -*- Mode: C; tab-width: 4 -*- - * - * Copyright (c) 2004 Apple Computer, Inc. All rights reserved. - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -#include // Needed for fopen() etc. -#include // Needed for close() -#include // Needed for strlen() etc. -#include // Needed for errno etc. -#include // Needed for socket() etc. -#include // Needed for sockaddr_in -#include - -#include "mDNSEmbeddedAPI.h" // Defines the interface provided to the client layer above -#include "DNSCommon.h" -#include "PlatformCommon.h" - -#ifdef NOT_HAVE_SOCKLEN_T - typedef unsigned int socklen_t; -#endif - -// Bind a UDP socket to find the source address to a destination -mDNSexport void mDNSPlatformSourceAddrForDest(mDNSAddr *const src, const mDNSAddr *const dst) - { - union { struct sockaddr s; struct sockaddr_in a4; struct sockaddr_in6 a6; } addr; - socklen_t len = sizeof(addr); - socklen_t inner_len = 0; - int sock = socket(AF_INET, SOCK_DGRAM, 0); - src->type = mDNSAddrType_None; - if (sock == -1) return; - if (dst->type == mDNSAddrType_IPv4) - { - inner_len = sizeof(addr.a4); - #ifndef NOT_HAVE_SA_LEN - addr.a4.sin_len = inner_len; - #endif - addr.a4.sin_family = AF_INET; - addr.a4.sin_port = 1; // Not important, any port will do - addr.a4.sin_addr.s_addr = dst->ip.v4.NotAnInteger; - } - else if (dst->type == mDNSAddrType_IPv6) - { - inner_len = sizeof(addr.a6); - #ifndef NOT_HAVE_SA_LEN - addr.a6.sin6_len = inner_len; - #endif - addr.a6.sin6_family = AF_INET6; - addr.a6.sin6_flowinfo = 0; - addr.a6.sin6_port = 1; // Not important, any port will do - addr.a6.sin6_addr = *(struct in6_addr*)&dst->ip.v6; - addr.a6.sin6_scope_id = 0; - } - else return; - - if ((connect(sock, &addr.s, inner_len)) < 0) - { LogMsg("mDNSPlatformSourceAddrForDest: connect %#a failed errno %d (%s)", dst, errno, strerror(errno)); goto exit; } - - if ((getsockname(sock, &addr.s, &len)) < 0) - { LogMsg("mDNSPlatformSourceAddrForDest: getsockname failed errno %d (%s)", errno, strerror(errno)); goto exit; } - - src->type = dst->type; - if (dst->type == mDNSAddrType_IPv4) src->ip.v4.NotAnInteger = addr.a4.sin_addr.s_addr; - else src->ip.v6 = *(mDNSv6Addr*)&addr.a6.sin6_addr; -exit: - close(sock); - } - -// dst must be at least MAX_ESCAPED_DOMAIN_NAME bytes, and option must be less than 32 bytes in length -mDNSlocal mDNSBool GetConfigOption(char *dst, const char *option, FILE *f) - { - char buf[32+1+MAX_ESCAPED_DOMAIN_NAME]; // Option name, one space, option value - unsigned int len = strlen(option); - if (len + 1 + MAX_ESCAPED_DOMAIN_NAME > sizeof(buf)-1) { LogMsg("GetConfigOption: option %s too long", option); return mDNSfalse; } - fseek(f, 0, SEEK_SET); // set position to beginning of stream - while (fgets(buf, sizeof(buf), f)) // Read at most sizeof(buf)-1 bytes from file, and append '\0' C-string terminator - { - if (!strncmp(buf, option, len)) - { - strncpy(dst, buf + len + 1, MAX_ESCAPED_DOMAIN_NAME-1); - if (dst[MAX_ESCAPED_DOMAIN_NAME-1]) dst[MAX_ESCAPED_DOMAIN_NAME-1] = '\0'; - len = strlen(dst); - if (len && dst[len-1] == '\n') dst[len-1] = '\0'; // chop newline - return mDNStrue; - } - } - debugf("Option %s not set", option); - return mDNSfalse; - } - -mDNSexport void ReadDDNSSettingsFromConfFile(mDNS *const m, const char *const filename, domainname *const hostname, domainname *const domain, mDNSBool *DomainDiscoveryDisabled) - { - char buf[MAX_ESCAPED_DOMAIN_NAME] = ""; - mStatus err; - FILE *f = fopen(filename, "r"); - - if (hostname) hostname->c[0] = 0; - if (domain) domain->c[0] = 0; - if (DomainDiscoveryDisabled) *DomainDiscoveryDisabled = mDNSfalse; - - if (f) - { - if (DomainDiscoveryDisabled && GetConfigOption(buf, "DomainDiscoveryDisabled", f) && !strcasecmp(buf, "true")) *DomainDiscoveryDisabled = mDNStrue; - if (hostname && GetConfigOption(buf, "hostname", f) && !MakeDomainNameFromDNSNameString(hostname, buf)) goto badf; - if (domain && GetConfigOption(buf, "zone", f) && !MakeDomainNameFromDNSNameString(domain, buf)) goto badf; - buf[0] = 0; - GetConfigOption(buf, "secret-64", f); // failure means no authentication - fclose(f); - f = NULL; - } - else - { - if (errno != ENOENT) LogMsg("ERROR: Config file exists, but cannot be opened."); - return; - } - - if (domain && domain->c[0] && buf[0]) - { - DomainAuthInfo *info = (DomainAuthInfo*)mDNSPlatformMemAllocate(sizeof(*info)); - // for now we assume keyname = service reg domain and we use same key for service and hostname registration - err = mDNS_SetSecretForDomain(m, info, domain, domain, buf, NULL, 0, NULL); - if (err) LogMsg("ERROR: mDNS_SetSecretForDomain returned %d for domain %##s", err, domain->c); - } - - return; - - badf: - LogMsg("ERROR: malformatted config file"); - if (f) fclose(f); - } - -#if MDNS_DEBUGMSGS -mDNSexport void mDNSPlatformWriteDebugMsg(const char *msg) - { - fprintf(stderr,"%s\n", msg); - fflush(stderr); - } -#endif - -mDNSexport void mDNSPlatformWriteLogMsg(const char *ident, const char *buffer, mDNSLogLevel_t loglevel) - { -#if APPLE_OSX_mDNSResponder && LogTimeStamps - extern mDNS mDNSStorage; - extern mDNSu32 mDNSPlatformClockDivisor; - mDNSs32 t = mDNSStorage.timenow ? mDNSStorage.timenow : mDNSPlatformClockDivisor ? mDNS_TimeNow_NoLock(&mDNSStorage) : 0; - int ms = ((t < 0) ? -t : t) % 1000; -#endif - - if (mDNS_DebugMode) // In debug mode we write to stderr - { -#if APPLE_OSX_mDNSResponder && LogTimeStamps - if (ident && ident[0] && mDNSPlatformClockDivisor) - fprintf(stderr,"%8d.%03d: %s\n", (int)(t/1000), ms, buffer); - else -#endif - fprintf(stderr,"%s\n", buffer); - fflush(stderr); - } - else // else, in production mode, we write to syslog - { - static int log_inited = 0; - - int syslog_level = LOG_ERR; - switch (loglevel) - { - case MDNS_LOG_MSG: syslog_level = LOG_ERR; break; - case MDNS_LOG_OPERATION: syslog_level = LOG_WARNING; break; - case MDNS_LOG_SPS: syslog_level = LOG_NOTICE; break; - case MDNS_LOG_INFO: syslog_level = LOG_INFO; break; - case MDNS_LOG_DEBUG: syslog_level = LOG_DEBUG; break; - default: - fprintf(stderr, "Unknown loglevel %d, assuming LOG_ERR\n", loglevel); - fflush(stderr); - } - - if (!log_inited) { openlog(ident, LOG_CONS, LOG_DAEMON); log_inited++; } - -#if APPLE_OSX_mDNSResponder && LogTimeStamps - if (ident && ident[0] && mDNSPlatformClockDivisor) - syslog(syslog_level, "%8d.%03d: %s", (int)(t/1000), ms, buffer); - else -#endif - syslog(syslog_level, "%s", buffer); - } - } diff --git a/src/tools/mdnssd/PlatformCommon.h b/src/tools/mdnssd/PlatformCommon.h deleted file mode 100644 index 631e3d731a..0000000000 --- a/src/tools/mdnssd/PlatformCommon.h +++ /dev/null @@ -1,18 +0,0 @@ -/* -*- Mode: C; tab-width: 4 -*- - * - * Copyright (c) 2004 Apple Computer, Inc. All rights reserved. - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -extern void ReadDDNSSettingsFromConfFile(mDNS *const m, const char *const filename, domainname *const hostname, domainname *const domain, mDNSBool *DomainDiscoveryDisabled); diff --git a/src/tools/mdnssd/PosixDaemon.c b/src/tools/mdnssd/PosixDaemon.c deleted file mode 100644 index acea1adb02..0000000000 --- a/src/tools/mdnssd/PosixDaemon.c +++ /dev/null @@ -1,258 +0,0 @@ -/* -*- Mode: C; tab-width: 4 -*- - * - * Copyright (c) 2003-2004 Apple Computer, Inc. All rights reserved. - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - - File: daemon.c - - Contains: main & associated Application layer for mDNSResponder on Linux. - - */ - -#if __APPLE__ -// In Mac OS X 10.5 and later trying to use the daemon function gives a "'daemon' is deprecated" -// error, which prevents compilation because we build with "-Werror". -// Since this is supposed to be portable cross-platform code, we don't care that daemon is -// deprecated on Mac OS X 10.5, so we use this preprocessor trick to eliminate the error message. -#define daemon yes_we_know_that_daemon_is_deprecated_in_os_x_10_5_thankyou -#endif - -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#if __APPLE__ -#undef daemon -extern int daemon(int, int); -#endif - -#include "mDNSEmbeddedAPI.h" -#include "mDNSPosix.h" -#include "mDNSUNP.h" // For daemon() -#include "uds_daemon.h" -#include "PlatformCommon.h" - -#define CONFIG_FILE "/etc/mdnsd.conf" -static domainname DynDNSZone; // Default wide-area zone for service registration -static domainname DynDNSHostname; - -#define RR_CACHE_SIZE 500 -static CacheEntity gRRCache[RR_CACHE_SIZE]; -static mDNS_PlatformSupport PlatformStorage; - -mDNSlocal void mDNS_StatusCallback(mDNS *const m, mStatus result) - { - (void)m; // Unused - if (result == mStatus_NoError) - { - // On successful registration of dot-local mDNS host name, daemon may want to check if - // any name conflict and automatic renaming took place, and if so, record the newly negotiated - // name in persistent storage for next time. It should also inform the user of the name change. - // On Mac OS X we store the current dot-local mDNS host name in the SCPreferences store, - // and notify the user with a CFUserNotification. - } - else if (result == mStatus_ConfigChanged) - { - udsserver_handle_configchange(m); - } - else if (result == mStatus_GrowCache) - { - // Allocate another chunk of cache storage - CacheEntity *storage = malloc(sizeof(CacheEntity) * RR_CACHE_SIZE); - if (storage) mDNS_GrowCache(m, storage, RR_CACHE_SIZE); - } - } - -// %%% Reconfigure() probably belongs in the platform support layer (mDNSPosix.c), not the daemon cde -// -- all client layers running on top of mDNSPosix.c need to handle network configuration changes, -// not only the Unix Domain Socket Daemon - -static void Reconfigure(mDNS *m) - { - mDNSAddr DynDNSIP; - const mDNSAddr dummy = { mDNSAddrType_IPv4, { { { 1, 1, 1, 1 } } } };; - mDNS_SetPrimaryInterfaceInfo(m, NULL, NULL, NULL); - if (ParseDNSServers(m, uDNS_SERVERS_FILE) < 0) - LogMsg("Unable to parse DNS server list. Unicast DNS-SD unavailable"); - ReadDDNSSettingsFromConfFile(m, CONFIG_FILE, &DynDNSHostname, &DynDNSZone, NULL); - mDNSPlatformSourceAddrForDest(&DynDNSIP, &dummy); - if (DynDNSHostname.c[0]) mDNS_AddDynDNSHostName(m, &DynDNSHostname, NULL, NULL); - if (DynDNSIP.type) mDNS_SetPrimaryInterfaceInfo(m, &DynDNSIP, NULL, NULL); - mDNS_ConfigChanged(m); - } - -// Do appropriate things at startup with command line arguments. Calls exit() if unhappy. -mDNSlocal void ParseCmdLinArgs(int argc, char **argv) - { - if (argc > 1) - { - if (0 == strcmp(argv[1], "-debug")) mDNS_DebugMode = mDNStrue; - else printf("Usage: %s [-debug]\n", argv[0]); - } - - if (!mDNS_DebugMode) - { - int result = daemon(0, 0); - if (result != 0) { LogMsg("Could not run as daemon - exiting"); exit(result); } -#if __APPLE__ - LogMsg("The POSIX mdnsd should only be used on OS X for testing - exiting"); - exit(-1); -#endif - } - } - -mDNSlocal void DumpStateLog(mDNS *const m) -// Dump a little log of what we've been up to. - { - LogMsg("---- BEGIN STATE LOG ----"); - udsserver_info(m); - LogMsg("---- END STATE LOG ----"); - } - -mDNSlocal mStatus MainLoop(mDNS *m) // Loop until we quit. - { - sigset_t signals; - mDNSBool gotData = mDNSfalse; - - mDNSPosixListenForSignalInEventLoop(SIGINT); - mDNSPosixListenForSignalInEventLoop(SIGTERM); - mDNSPosixListenForSignalInEventLoop(SIGUSR1); - mDNSPosixListenForSignalInEventLoop(SIGPIPE); - mDNSPosixListenForSignalInEventLoop(SIGHUP) ; - - for (; ;) - { - // Work out how long we expect to sleep before the next scheduled task - struct timeval timeout; - mDNSs32 ticks; - - // Only idle if we didn't find any data the last time around - if (!gotData) - { - mDNSs32 nextTimerEvent = mDNS_Execute(m); - nextTimerEvent = udsserver_idle(nextTimerEvent); - ticks = nextTimerEvent - mDNS_TimeNow(m); - if (ticks < 1) ticks = 1; - } - else // otherwise call EventLoop again with 0 timemout - ticks = 0; - - timeout.tv_sec = ticks / mDNSPlatformOneSecond; - timeout.tv_usec = (ticks % mDNSPlatformOneSecond) * 1000000 / mDNSPlatformOneSecond; - - (void) mDNSPosixRunEventLoopOnce(m, &timeout, &signals, &gotData); - - if (sigismember(&signals, SIGHUP )) Reconfigure(m); - if (sigismember(&signals, SIGUSR1)) DumpStateLog(m); - // SIGPIPE happens when we try to write to a dead client; death should be detected soon in request_callback() and cleaned up. - if (sigismember(&signals, SIGPIPE)) LogMsg("Received SIGPIPE - ignoring"); - if (sigismember(&signals, SIGINT) || sigismember(&signals, SIGTERM)) break; - } - return EINTR; - } - -int main(int argc, char **argv) - { - mStatus err; - - ParseCmdLinArgs(argc, argv); - - LogMsg("%s starting", mDNSResponderVersionString); - - err = mDNS_Init(&mDNSStorage, &PlatformStorage, gRRCache, RR_CACHE_SIZE, mDNS_Init_AdvertiseLocalAddresses, - mDNS_StatusCallback, mDNS_Init_NoInitCallbackContext); - - if (mStatus_NoError == err) - err = udsserver_init(mDNSNULL, 0); - - Reconfigure(&mDNSStorage); - - // Now that we're finished with anything privileged, switch over to running as "nobody" - if (mStatus_NoError == err) - { - const struct passwd *pw = getpwnam("nobody"); - if (pw != NULL) - setuid(pw->pw_uid); - else - LogMsg("WARNING: mdnsd continuing as root because user \"nobody\" does not exist"); - } - - if (mStatus_NoError == err) - err = MainLoop(&mDNSStorage); - - LogMsg("%s stopping", mDNSResponderVersionString); - - mDNS_Close(&mDNSStorage); - - if (udsserver_exit() < 0) - LogMsg("ExitCallback: udsserver_exit failed"); - - #if MDNS_DEBUGMSGS > 0 - printf("mDNSResponder exiting normally with %ld\n", err); - #endif - - return err; - } - -// uds_daemon support //////////////////////////////////////////////////////////// - -mStatus udsSupportAddFDToEventLoop(int fd, udsEventCallback callback, void *context, void **platform_data) -/* Support routine for uds_daemon.c */ - { - // Depends on the fact that udsEventCallback == mDNSPosixEventCallback - (void) platform_data; - return mDNSPosixAddFDToEventLoop(fd, callback, context); - } - -int udsSupportReadFD(dnssd_sock_t fd, char *buf, int len, int flags, void *platform_data) - { - (void) platform_data; - return recv(fd, buf, len, flags); - } - -mStatus udsSupportRemoveFDFromEventLoop(int fd, void *platform_data) // Note: This also CLOSES the file descriptor - { - mStatus err = mDNSPosixRemoveFDFromEventLoop(fd); - (void) platform_data; - close(fd); - return err; - } - -mDNSexport void RecordUpdatedNiceLabel(mDNS *const m, mDNSs32 delay) - { - (void)m; - (void)delay; - // No-op, for now - } - -#if _BUILDING_XCODE_PROJECT_ -// If the process crashes, then this string will be magically included in the automatically-generated crash log -const char *__crashreporter_info__ = mDNSResponderVersionString_SCCS + 5; -asm(".desc ___crashreporter_info__, 0x10"); -#endif - -// For convenience when using the "strings" command, this is the last thing in the file -#if mDNSResponderVersion > 1 -mDNSexport const char mDNSResponderVersionString_SCCS[] = "@(#) mDNSResponder-" STRINGIFY(mDNSResponderVersion) " (" __DATE__ " " __TIME__ ")"; -#elif MDNS_VERSIONSTR_NODTS -mDNSexport const char mDNSResponderVersionString_SCCS[] = "@(#) mDNSResponder (Engineering Build)"; -#else -mDNSexport const char mDNSResponderVersionString_SCCS[] = "@(#) mDNSResponder (Engineering Build) (" __DATE__ " " __TIME__ ")"; -#endif diff --git a/src/tools/mdnssd/dns_sd.h b/src/tools/mdnssd/dns_sd.h deleted file mode 100644 index 3caa6a8586..0000000000 --- a/src/tools/mdnssd/dns_sd.h +++ /dev/null @@ -1,2434 +0,0 @@ -/* -*- Mode: C; tab-width: 4 -*- - * - * Copyright (c) 2003-2004, Apple Computer, Inc. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions are met: - * - * 1. Redistributions of source code must retain the above copyright notice, - * this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright notice, - * this list of conditions and the following disclaimer in the documentation - * and/or other materials provided with the distribution. - * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of its - * contributors may be used to endorse or promote products derived from this - * software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY - * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED - * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE - * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY - * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES - * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; - * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND - * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS - * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ - - -/*! @header DNS Service Discovery - * - * @discussion This section describes the functions, callbacks, and data structures - * that make up the DNS Service Discovery API. - * - * The DNS Service Discovery API is part of Bonjour, Apple's implementation - * of zero-configuration networking (ZEROCONF). - * - * Bonjour allows you to register a network service, such as a - * printer or file server, so that it can be found by name or browsed - * for by service type and domain. Using Bonjour, applications can - * discover what services are available on the network, along with - * all the information -- such as name, IP address, and port -- - * necessary to access a particular service. - * - * In effect, Bonjour combines the functions of a local DNS server and - * AppleTalk. Bonjour allows applications to provide user-friendly printer - * and server browsing, among other things, over standard IP networks. - * This behavior is a result of combining protocols such as multicast and - * DNS to add new functionality to the network (such as multicast DNS). - * - * Bonjour gives applications easy access to services over local IP - * networks without requiring the service or the application to support - * an AppleTalk or a Netbeui stack, and without requiring a DNS server - * for the local network. - */ - - -/* _DNS_SD_H contains the mDNSResponder version number for this header file, formatted as follows: - * Major part of the build number * 10000 + - * minor part of the build number * 100 - * For example, Mac OS X 10.4.9 has mDNSResponder-108.4, which would be represented as - * version 1080400. This allows C code to do simple greater-than and less-than comparisons: - * e.g. an application that requires the DNSServiceGetProperty() call (new in mDNSResponder-126) can check: - * - * #if _DNS_SD_H+0 >= 1260000 - * ... some C code that calls DNSServiceGetProperty() ... - * #endif - * - * The version defined in this header file symbol allows for compile-time - * checking, so that C code building with earlier versions of the header file - * can avoid compile errors trying to use functions that aren't even defined - * in those earlier versions. Similar checks may also be performed at run-time: - * => weak linking -- to avoid link failures if run with an earlier - * version of the library that's missing some desired symbol, or - * => DNSServiceGetProperty(DaemonVersion) -- to verify whether the running daemon - * ("system service" on Windows) meets some required minimum functionality level. - */ - -#ifndef _DNS_SD_H -#define _DNS_SD_H 3331000 - -#ifdef __cplusplus - extern "C" { -#endif - -/* Set to 1 if libdispatch is supported - * Note: May also be set by project and/or Makefile - */ -#ifndef _DNS_SD_LIBDISPATCH -#define _DNS_SD_LIBDISPATCH 0 -#endif /* ndef _DNS_SD_LIBDISPATCH */ - -/* standard calling convention under Win32 is __stdcall */ -/* Note: When compiling Intel EFI (Extensible Firmware Interface) under MS Visual Studio, the */ -/* _WIN32 symbol is defined by the compiler even though it's NOT compiling code for Windows32 */ -#if defined(_WIN32) && !defined(EFI32) && !defined(EFI64) -#define DNSSD_API __stdcall -#else -#define DNSSD_API -#endif - -/* stdint.h does not exist on FreeBSD 4.x; its types are defined in sys/types.h instead */ -#if defined(__FreeBSD__) && (__FreeBSD__ < 5) -#include - -/* Likewise, on Sun, standard integer types are in sys/types.h */ -#elif defined(__sun__) -#include - -/* EFI does not have stdint.h, or anything else equivalent */ -#elif defined(EFI32) || defined(EFI64) || defined(EFIX64) -#include "Tiano.h" -#if !defined(_STDINT_H_) -typedef UINT8 uint8_t; -typedef INT8 int8_t; -typedef UINT16 uint16_t; -typedef INT16 int16_t; -typedef UINT32 uint32_t; -typedef INT32 int32_t; -#endif -/* Windows has its own differences */ -#elif defined(_WIN32) -#include -#define _UNUSED -#ifndef _MSL_STDINT_H -typedef UINT8 uint8_t; -typedef INT8 int8_t; -typedef UINT16 uint16_t; -typedef INT16 int16_t; -typedef UINT32 uint32_t; -typedef INT32 int32_t; -#endif - -/* All other Posix platforms use stdint.h */ -#else -#include -#endif - -#if _DNS_SD_LIBDISPATCH -#include -#endif - -/* DNSServiceRef, DNSRecordRef - * - * Opaque internal data types. - * Note: client is responsible for serializing access to these structures if - * they are shared between concurrent threads. - */ - -typedef struct _DNSServiceRef_t *DNSServiceRef; -typedef struct _DNSRecordRef_t *DNSRecordRef; - -struct sockaddr; - -/*! @enum General flags - * Most DNS-SD API functions and callbacks include a DNSServiceFlags parameter. - * As a general rule, any given bit in the 32-bit flags field has a specific fixed meaning, - * regardless of the function or callback being used. For any given function or callback, - * typically only a subset of the possible flags are meaningful, and all others should be zero. - * The discussion section for each API call describes which flags are valid for that call - * and callback. In some cases, for a particular call, it may be that no flags are currently - * defined, in which case the DNSServiceFlags parameter exists purely to allow future expansion. - * In all cases, developers should expect that in future releases, it is possible that new flag - * values will be defined, and write code with this in mind. For example, code that tests - * if (flags == kDNSServiceFlagsAdd) ... - * will fail if, in a future release, another bit in the 32-bit flags field is also set. - * The reliable way to test whether a particular bit is set is not with an equality test, - * but with a bitwise mask: - * if (flags & kDNSServiceFlagsAdd) ... - */ -enum - { - kDNSServiceFlagsMoreComing = 0x1, - /* MoreComing indicates to a callback that at least one more result is - * queued and will be delivered following immediately after this one. - * When the MoreComing flag is set, applications should not immediately - * update their UI, because this can result in a great deal of ugly flickering - * on the screen, and can waste a great deal of CPU time repeatedly updating - * the screen with content that is then immediately erased, over and over. - * Applications should wait until until MoreComing is not set, and then - * update their UI when no more changes are imminent. - * When MoreComing is not set, that doesn't mean there will be no more - * answers EVER, just that there are no more answers immediately - * available right now at this instant. If more answers become available - * in the future they will be delivered as usual. - */ - - kDNSServiceFlagsAdd = 0x2, - kDNSServiceFlagsDefault = 0x4, - /* Flags for domain enumeration and browse/query reply callbacks. - * "Default" applies only to enumeration and is only valid in - * conjunction with "Add". An enumeration callback with the "Add" - * flag NOT set indicates a "Remove", i.e. the domain is no longer - * valid. - */ - - kDNSServiceFlagsNoAutoRename = 0x8, - /* Flag for specifying renaming behavior on name conflict when registering - * non-shared records. By default, name conflicts are automatically handled - * by renaming the service. NoAutoRename overrides this behavior - with this - * flag set, name conflicts will result in a callback. The NoAutorename flag - * is only valid if a name is explicitly specified when registering a service - * (i.e. the default name is not used.) - */ - - kDNSServiceFlagsShared = 0x10, - kDNSServiceFlagsUnique = 0x20, - /* Flag for registering individual records on a connected - * DNSServiceRef. Shared indicates that there may be multiple records - * with this name on the network (e.g. PTR records). Unique indicates that the - * record's name is to be unique on the network (e.g. SRV records). - */ - - kDNSServiceFlagsBrowseDomains = 0x40, - kDNSServiceFlagsRegistrationDomains = 0x80, - /* Flags for specifying domain enumeration type in DNSServiceEnumerateDomains. - * BrowseDomains enumerates domains recommended for browsing, RegistrationDomains - * enumerates domains recommended for registration. - */ - - kDNSServiceFlagsLongLivedQuery = 0x100, - /* Flag for creating a long-lived unicast query for the DNSServiceQueryRecord call. */ - - kDNSServiceFlagsAllowRemoteQuery = 0x200, - /* Flag for creating a record for which we will answer remote queries - * (queries from hosts more than one hop away; hosts not directly connected to the local link). - */ - - kDNSServiceFlagsForceMulticast = 0x400, - /* Flag for signifying that a query or registration should be performed exclusively via multicast - * DNS, even for a name in a domain (e.g. foo.apple.com.) that would normally imply unicast DNS. - */ - - kDNSServiceFlagsForce = 0x800, - /* Flag for signifying a "stronger" variant of an operation. - * Currently defined only for DNSServiceReconfirmRecord(), where it forces a record to - * be removed from the cache immediately, instead of querying for a few seconds before - * concluding that the record is no longer valid and then removing it. This flag should - * be used with caution because if a service browsing PTR record is indeed still valid - * on the network, forcing its removal will result in a user-interface flap -- the - * discovered service instance will disappear, and then re-appear moments later. - */ - - kDNSServiceFlagsReturnIntermediates = 0x1000, - /* Flag for returning intermediate results. - * For example, if a query results in an authoritative NXDomain (name does not exist) - * then that result is returned to the client. However the query is not implicitly - * cancelled -- it remains active and if the answer subsequently changes - * (e.g. because a VPN tunnel is subsequently established) then that positive - * result will still be returned to the client. - * Similarly, if a query results in a CNAME record, then in addition to following - * the CNAME referral, the intermediate CNAME result is also returned to the client. - * When this flag is not set, NXDomain errors are not returned, and CNAME records - * are followed silently without informing the client of the intermediate steps. - * (In earlier builds this flag was briefly calledkDNSServiceFlagsReturnCNAME) - */ - - kDNSServiceFlagsNonBrowsable = 0x2000, - /* A service registered with the NonBrowsable flag set can be resolved using - * DNSServiceResolve(), but will not be discoverable using DNSServiceBrowse(). - * This is for cases where the name is actually a GUID; it is found by other means; - * there is no end-user benefit to browsing to find a long list of opaque GUIDs. - * Using the NonBrowsable flag creates SRV+TXT without the cost of also advertising - * an associated PTR record. - */ - - kDNSServiceFlagsShareConnection = 0x4000, - /* For efficiency, clients that perform many concurrent operations may want to use a - * single Unix Domain Socket connection with the background daemon, instead of having a - * separate connection for each independent operation. To use this mode, clients first - * call DNSServiceCreateConnection(&MainRef) to initialize the main DNSServiceRef. - * For each subsequent operation that is to share that same connection, the client copies - * the MainRef, and then passes the address of that copy, setting the ShareConnection flag - * to tell the library that this DNSServiceRef is not a typical uninitialized DNSServiceRef; - * it's a copy of an existing DNSServiceRef whose connection information should be reused. - * - * For example: - * - * DNSServiceErrorType error; - * DNSServiceRef MainRef; - * error = DNSServiceCreateConnection(&MainRef); - * if (error) ... - * DNSServiceRef BrowseRef = MainRef; // Important: COPY the primary DNSServiceRef first... - * error = DNSServiceBrowse(&BrowseRef, kDNSServiceFlagsShareConnection, ...); // then use the copy - * if (error) ... - * ... - * DNSServiceRefDeallocate(BrowseRef); // Terminate the browse operation - * DNSServiceRefDeallocate(MainRef); // Terminate the shared connection - * - * Notes: - * - * 1. Collective kDNSServiceFlagsMoreComing flag - * When callbacks are invoked using a shared DNSServiceRef, the - * kDNSServiceFlagsMoreComing flag applies collectively to *all* active - * operations sharing the same parent DNSServiceRef. If the MoreComing flag is - * set it means that there are more results queued on this parent DNSServiceRef, - * but not necessarily more results for this particular callback function. - * The implication of this for client programmers is that when a callback - * is invoked with the MoreComing flag set, the code should update its - * internal data structures with the new result, and set a variable indicating - * that its UI needs to be updated. Then, later when a callback is eventually - * invoked with the MoreComing flag not set, the code should update *all* - * stale UI elements related to that shared parent DNSServiceRef that need - * updating, not just the UI elements related to the particular callback - * that happened to be the last one to be invoked. - * - * 2. Canceling operations and kDNSServiceFlagsMoreComing - * Whenever you cancel any operation for which you had deferred UI updates - * waiting because of a kDNSServiceFlagsMoreComing flag, you should perform - * those deferred UI updates. This is because, after cancelling the operation, - * you can no longer wait for a callback *without* MoreComing set, to tell - * you do perform your deferred UI updates (the operation has been canceled, - * so there will be no more callbacks). An implication of the collective - * kDNSServiceFlagsMoreComing flag for shared connections is that this - * guideline applies more broadly -- any time you cancel an operation on - * a shared connection, you should perform all deferred UI updates for all - * operations sharing that connection. This is because the MoreComing flag - * might have been referring to events coming for the operation you canceled, - * which will now not be coming because the operation has been canceled. - * - * 3. Only share DNSServiceRef's created with DNSServiceCreateConnection - * Calling DNSServiceCreateConnection(&ref) creates a special shareable DNSServiceRef. - * DNSServiceRef's created by other calls like DNSServiceBrowse() or DNSServiceResolve() - * cannot be shared by copying them and using kDNSServiceFlagsShareConnection. - * - * 4. Don't Double-Deallocate - * Calling DNSServiceRefDeallocate(ref) for a particular operation's DNSServiceRef terminates - * just that operation. Calling DNSServiceRefDeallocate(ref) for the main shared DNSServiceRef - * (the parent DNSServiceRef, originally created by DNSServiceCreateConnection(&ref)) - * automatically terminates the shared connection and all operations that were still using it. - * After doing this, DO NOT then attempt to deallocate any remaining subordinate DNSServiceRef's. - * The memory used by those subordinate DNSServiceRef's has already been freed, so any attempt - * to do a DNSServiceRefDeallocate (or any other operation) on them will result in accesses - * to freed memory, leading to crashes or other equally undesirable results. - * - * 5. Thread Safety - * The dns_sd.h API does not presuppose any particular threading model, and consequently - * does no locking of its own (which would require linking some specific threading library). - * If client code calls API routines on the same DNSServiceRef concurrently - * from multiple threads, it is the client's responsibility to use a mutext - * lock or take similar appropriate precautions to serialize those calls. - */ - - kDNSServiceFlagsSuppressUnusable = 0x8000, - /* - * This flag is meaningful only in DNSServiceQueryRecord which suppresses unusable queries on the - * wire. If "hostname" is a wide-area unicast DNS hostname (i.e. not a ".local." name) - * but this host has no routable IPv6 address, then the call will not try to look up IPv6 addresses - * for "hostname", since any addresses it found would be unlikely to be of any use anyway. Similarly, - * if this host has no routable IPv4 address, the call will not try to look up IPv4 addresses for - * "hostname". - */ - - kDNSServiceFlagsTimeout = 0x10000, - /* - * When kDNServiceFlagsTimeout is passed to DNSServiceQueryRecord or DNSServiceGetAddrInfo, the query is - * stopped after a certain number of seconds have elapsed. The time at which the query will be stopped - * is determined by the system and cannot be configured by the user. The query will be stopped irrespective - * of whether a response was given earlier or not. When the query is stopped, the callback will be called - * with an error code of kDNSServiceErr_Timeout and a NULL sockaddr will be returned for DNSServiceGetAddrInfo - * and zero length rdata will be returned for DNSServiceQueryRecord. - */ - - kDNSServiceFlagsIncludeP2P = 0x20000, - /* - * Include P2P interfaces when kDNSServiceInterfaceIndexAny is specified. - * By default, specifying kDNSServiceInterfaceIndexAny does not include P2P interfaces. - */ - kDNSServiceFlagsWakeOnResolve = 0x40000 - /* - * This flag is meaningful only in DNSServiceResolve. When set, it tries to send a magic packet - * to wake up the client. - */ - }; - -/* Possible protocols for DNSServiceNATPortMappingCreate(). */ -enum - { - kDNSServiceProtocol_IPv4 = 0x01, - kDNSServiceProtocol_IPv6 = 0x02, - /* 0x04 and 0x08 reserved for future internetwork protocols */ - - kDNSServiceProtocol_UDP = 0x10, - kDNSServiceProtocol_TCP = 0x20 - /* 0x40 and 0x80 reserved for future transport protocols, e.g. SCTP [RFC 2960] - * or DCCP [RFC 4340]. If future NAT gateways are created that support port - * mappings for these protocols, new constants will be defined here. - */ - }; - -/* - * The values for DNS Classes and Types are listed in RFC 1035, and are available - * on every OS in its DNS header file. Unfortunately every OS does not have the - * same header file containing DNS Class and Type constants, and the names of - * the constants are not consistent. For example, BIND 8 uses "T_A", - * BIND 9 uses "ns_t_a", Windows uses "DNS_TYPE_A", etc. - * For this reason, these constants are also listed here, so that code using - * the DNS-SD programming APIs can use these constants, so that the same code - * can compile on all our supported platforms. - */ - -enum - { - kDNSServiceClass_IN = 1 /* Internet */ - }; - -enum - { - kDNSServiceType_A = 1, /* Host address. */ - kDNSServiceType_NS = 2, /* Authoritative server. */ - kDNSServiceType_MD = 3, /* Mail destination. */ - kDNSServiceType_MF = 4, /* Mail forwarder. */ - kDNSServiceType_CNAME = 5, /* Canonical name. */ - kDNSServiceType_SOA = 6, /* Start of authority zone. */ - kDNSServiceType_MB = 7, /* Mailbox domain name. */ - kDNSServiceType_MG = 8, /* Mail group member. */ - kDNSServiceType_MR = 9, /* Mail rename name. */ - kDNSServiceType_NULL = 10, /* Null resource record. */ - kDNSServiceType_WKS = 11, /* Well known service. */ - kDNSServiceType_PTR = 12, /* Domain name pointer. */ - kDNSServiceType_HINFO = 13, /* Host information. */ - kDNSServiceType_MINFO = 14, /* Mailbox information. */ - kDNSServiceType_MX = 15, /* Mail routing information. */ - kDNSServiceType_TXT = 16, /* One or more text strings (NOT "zero or more..."). */ - kDNSServiceType_RP = 17, /* Responsible person. */ - kDNSServiceType_AFSDB = 18, /* AFS cell database. */ - kDNSServiceType_X25 = 19, /* X_25 calling address. */ - kDNSServiceType_ISDN = 20, /* ISDN calling address. */ - kDNSServiceType_RT = 21, /* Router. */ - kDNSServiceType_NSAP = 22, /* NSAP address. */ - kDNSServiceType_NSAP_PTR = 23, /* Reverse NSAP lookup (deprecated). */ - kDNSServiceType_SIG = 24, /* Security signature. */ - kDNSServiceType_KEY = 25, /* Security key. */ - kDNSServiceType_PX = 26, /* X.400 mail mapping. */ - kDNSServiceType_GPOS = 27, /* Geographical position (withdrawn). */ - kDNSServiceType_AAAA = 28, /* IPv6 Address. */ - kDNSServiceType_LOC = 29, /* Location Information. */ - kDNSServiceType_NXT = 30, /* Next domain (security). */ - kDNSServiceType_EID = 31, /* Endpoint identifier. */ - kDNSServiceType_NIMLOC = 32, /* Nimrod Locator. */ - kDNSServiceType_SRV = 33, /* Server Selection. */ - kDNSServiceType_ATMA = 34, /* ATM Address */ - kDNSServiceType_NAPTR = 35, /* Naming Authority PoinTeR */ - kDNSServiceType_KX = 36, /* Key Exchange */ - kDNSServiceType_CERT = 37, /* Certification record */ - kDNSServiceType_A6 = 38, /* IPv6 Address (deprecated) */ - kDNSServiceType_DNAME = 39, /* Non-terminal DNAME (for IPv6) */ - kDNSServiceType_SINK = 40, /* Kitchen sink (experimental) */ - kDNSServiceType_OPT = 41, /* EDNS0 option (meta-RR) */ - kDNSServiceType_APL = 42, /* Address Prefix List */ - kDNSServiceType_DS = 43, /* Delegation Signer */ - kDNSServiceType_SSHFP = 44, /* SSH Key Fingerprint */ - kDNSServiceType_IPSECKEY = 45, /* IPSECKEY */ - kDNSServiceType_RRSIG = 46, /* RRSIG */ - kDNSServiceType_NSEC = 47, /* Denial of Existence */ - kDNSServiceType_DNSKEY = 48, /* DNSKEY */ - kDNSServiceType_DHCID = 49, /* DHCP Client Identifier */ - kDNSServiceType_NSEC3 = 50, /* Hashed Authenticated Denial of Existence */ - kDNSServiceType_NSEC3PARAM = 51, /* Hashed Authenticated Denial of Existence */ - - kDNSServiceType_HIP = 55, /* Host Identity Protocol */ - - kDNSServiceType_SPF = 99, /* Sender Policy Framework for E-Mail */ - kDNSServiceType_UINFO = 100, /* IANA-Reserved */ - kDNSServiceType_UID = 101, /* IANA-Reserved */ - kDNSServiceType_GID = 102, /* IANA-Reserved */ - kDNSServiceType_UNSPEC = 103, /* IANA-Reserved */ - - kDNSServiceType_TKEY = 249, /* Transaction key */ - kDNSServiceType_TSIG = 250, /* Transaction signature. */ - kDNSServiceType_IXFR = 251, /* Incremental zone transfer. */ - kDNSServiceType_AXFR = 252, /* Transfer zone of authority. */ - kDNSServiceType_MAILB = 253, /* Transfer mailbox records. */ - kDNSServiceType_MAILA = 254, /* Transfer mail agent records. */ - kDNSServiceType_ANY = 255 /* Wildcard match. */ - }; - -/* possible error code values */ -enum - { - kDNSServiceErr_NoError = 0, - kDNSServiceErr_Unknown = -65537, /* 0xFFFE FFFF */ - kDNSServiceErr_NoSuchName = -65538, - kDNSServiceErr_NoMemory = -65539, - kDNSServiceErr_BadParam = -65540, - kDNSServiceErr_BadReference = -65541, - kDNSServiceErr_BadState = -65542, - kDNSServiceErr_BadFlags = -65543, - kDNSServiceErr_Unsupported = -65544, - kDNSServiceErr_NotInitialized = -65545, - kDNSServiceErr_AlreadyRegistered = -65547, - kDNSServiceErr_NameConflict = -65548, - kDNSServiceErr_Invalid = -65549, - kDNSServiceErr_Firewall = -65550, - kDNSServiceErr_Incompatible = -65551, /* client library incompatible with daemon */ - kDNSServiceErr_BadInterfaceIndex = -65552, - kDNSServiceErr_Refused = -65553, - kDNSServiceErr_NoSuchRecord = -65554, - kDNSServiceErr_NoAuth = -65555, - kDNSServiceErr_NoSuchKey = -65556, - kDNSServiceErr_NATTraversal = -65557, - kDNSServiceErr_DoubleNAT = -65558, - kDNSServiceErr_BadTime = -65559, /* Codes up to here existed in Tiger */ - kDNSServiceErr_BadSig = -65560, - kDNSServiceErr_BadKey = -65561, - kDNSServiceErr_Transient = -65562, - kDNSServiceErr_ServiceNotRunning = -65563, /* Background daemon not running */ - kDNSServiceErr_NATPortMappingUnsupported = -65564, /* NAT doesn't support NAT-PMP or UPnP */ - kDNSServiceErr_NATPortMappingDisabled = -65565, /* NAT supports NAT-PMP or UPnP but it's disabled by the administrator */ - kDNSServiceErr_NoRouter = -65566, /* No router currently configured (probably no network connectivity) */ - kDNSServiceErr_PollingMode = -65567, - kDNSServiceErr_Timeout = -65568 - - /* mDNS Error codes are in the range - * FFFE FF00 (-65792) to FFFE FFFF (-65537) */ - }; - -/* Maximum length, in bytes, of a service name represented as a */ -/* literal C-String, including the terminating NULL at the end. */ - -#define kDNSServiceMaxServiceName 64 - -/* Maximum length, in bytes, of a domain name represented as an *escaped* C-String */ -/* including the final trailing dot, and the C-String terminating NULL at the end. */ - -#define kDNSServiceMaxDomainName 1009 - -/* - * Notes on DNS Name Escaping - * -- or -- - * "Why is kDNSServiceMaxDomainName 1009, when the maximum legal domain name is 256 bytes?" - * - * All strings used in the DNS-SD APIs are UTF-8 strings. Apart from the exceptions noted below, - * the APIs expect the strings to be properly escaped, using the conventional DNS escaping rules: - * - * '\\' represents a single literal '\' in the name - * '\.' represents a single literal '.' in the name - * '\ddd', where ddd is a three-digit decimal value from 000 to 255, - * represents a single literal byte with that value. - * A bare unescaped '.' is a label separator, marking a boundary between domain and subdomain. - * - * The exceptions, that do not use escaping, are the routines where the full - * DNS name of a resource is broken, for convenience, into servicename/regtype/domain. - * In these routines, the "servicename" is NOT escaped. It does not need to be, since - * it is, by definition, just a single literal string. Any characters in that string - * represent exactly what they are. The "regtype" portion is, technically speaking, - * escaped, but since legal regtypes are only allowed to contain letters, digits, - * and hyphens, there is nothing to escape, so the issue is moot. The "domain" - * portion is also escaped, though most domains in use on the public Internet - * today, like regtypes, don't contain any characters that need to be escaped. - * As DNS-SD becomes more popular, rich-text domains for service discovery will - * become common, so software should be written to cope with domains with escaping. - * - * The servicename may be up to 63 bytes of UTF-8 text (not counting the C-String - * terminating NULL at the end). The regtype is of the form _service._tcp or - * _service._udp, where the "service" part is 1-15 characters, which may be - * letters, digits, or hyphens. The domain part of the three-part name may be - * any legal domain, providing that the resulting servicename+regtype+domain - * name does not exceed 256 bytes. - * - * For most software, these issues are transparent. When browsing, the discovered - * servicenames should simply be displayed as-is. When resolving, the discovered - * servicename/regtype/domain are simply passed unchanged to DNSServiceResolve(). - * When a DNSServiceResolve() succeeds, the returned fullname is already in - * the correct format to pass to standard system DNS APIs such as res_query(). - * For converting from servicename/regtype/domain to a single properly-escaped - * full DNS name, the helper function DNSServiceConstructFullName() is provided. - * - * The following (highly contrived) example illustrates the escaping process. - * Suppose you have an service called "Dr. Smith\Dr. Johnson", of type "_ftp._tcp" - * in subdomain "4th. Floor" of subdomain "Building 2" of domain "apple.com." - * The full (escaped) DNS name of this service's SRV record would be: - * Dr\.\032Smith\\Dr\.\032Johnson._ftp._tcp.4th\.\032Floor.Building\0322.apple.com. - */ - - -/* - * Constants for specifying an interface index - * - * Specific interface indexes are identified via a 32-bit unsigned integer returned - * by the if_nametoindex() family of calls. - * - * If the client passes 0 for interface index, that means "do the right thing", - * which (at present) means, "if the name is in an mDNS local multicast domain - * (e.g. 'local.', '254.169.in-addr.arpa.', '{8,9,A,B}.E.F.ip6.arpa.') then multicast - * on all applicable interfaces, otherwise send via unicast to the appropriate - * DNS server." Normally, most clients will use 0 for interface index to - * automatically get the default sensible behaviour. - * - * If the client passes a positive interface index, then for multicast names that - * indicates to do the operation only on that one interface. For unicast names the - * interface index is ignored unless kDNSServiceFlagsForceMulticast is also set. - * - * If the client passes kDNSServiceInterfaceIndexLocalOnly when registering - * a service, then that service will be found *only* by other local clients - * on the same machine that are browsing using kDNSServiceInterfaceIndexLocalOnly - * or kDNSServiceInterfaceIndexAny. - * If a client has a 'private' service, accessible only to other processes - * running on the same machine, this allows the client to advertise that service - * in a way such that it does not inadvertently appear in service lists on - * all the other machines on the network. - * - * If the client passes kDNSServiceInterfaceIndexLocalOnly when browsing - * then it will find *all* records registered on that same local machine. - * Clients explicitly wishing to discover *only* LocalOnly services can - * accomplish this by inspecting the interfaceIndex of each service reported - * to their DNSServiceBrowseReply() callback function, and discarding those - * where the interface index is not kDNSServiceInterfaceIndexLocalOnly. - * - * kDNSServiceInterfaceIndexP2P is meaningful only in Browse, QueryRecord, - * and Resolve operations. It should not be used in other DNSService APIs. - * - * - If kDNSServiceInterfaceIndexP2P is passed to DNSServiceBrowse or - * DNSServiceQueryRecord, it restricts the operation to P2P. - * - * - If kDNSServiceInterfaceIndexP2P is passed to DNSServiceResolve, it is - * mapped internally to kDNSServiceInterfaceIndexAny, because resolving - * a P2P service may create and/or enable an interface whose index is not - * known a priori. The resolve callback will indicate the index of the - * interface via which the service can be accessed. - * - * If applications pass kDNSServiceInterfaceIndexAny to DNSServiceBrowse - * or DNSServiceQueryRecord, they must set the kDNSServiceFlagsIncludeP2P flag - * to include P2P. In this case, if a service instance or the record being queried - * is found over P2P, the resulting ADD event will indicate kDNSServiceInterfaceIndexP2P - * as the interface index. - */ - -#define kDNSServiceInterfaceIndexAny 0 -#define kDNSServiceInterfaceIndexLocalOnly ((uint32_t)-1) -#define kDNSServiceInterfaceIndexUnicast ((uint32_t)-2) -#define kDNSServiceInterfaceIndexP2P ((uint32_t)-3) - -typedef uint32_t DNSServiceFlags; -typedef uint32_t DNSServiceProtocol; -typedef int32_t DNSServiceErrorType; - - -/********************************************************************************************* - * - * Version checking - * - *********************************************************************************************/ - -/* DNSServiceGetProperty() Parameters: - * - * property: The requested property. - * Currently the only property defined is kDNSServiceProperty_DaemonVersion. - * - * result: Place to store result. - * For retrieving DaemonVersion, this should be the address of a uint32_t. - * - * size: Pointer to uint32_t containing size of the result location. - * For retrieving DaemonVersion, this should be sizeof(uint32_t). - * On return the uint32_t is updated to the size of the data returned. - * For DaemonVersion, the returned size is always sizeof(uint32_t), but - * future properties could be defined which return variable-sized results. - * - * return value: Returns kDNSServiceErr_NoError on success, or kDNSServiceErr_ServiceNotRunning - * if the daemon (or "system service" on Windows) is not running. - */ - -DNSServiceErrorType DNSSD_API DNSServiceGetProperty - ( - const char *property, /* Requested property (i.e. kDNSServiceProperty_DaemonVersion) */ - void *result, /* Pointer to place to store result */ - uint32_t *size /* size of result location */ - ); - -/* - * When requesting kDNSServiceProperty_DaemonVersion, the result pointer must point - * to a 32-bit unsigned integer, and the size parameter must be set to sizeof(uint32_t). - * - * On return, the 32-bit unsigned integer contains the version number, formatted as follows: - * Major part of the build number * 10000 + - * minor part of the build number * 100 - * - * For example, Mac OS X 10.4.9 has mDNSResponder-108.4, which would be represented as - * version 1080400. This allows applications to do simple greater-than and less-than comparisons: - * e.g. an application that requires at least mDNSResponder-108.4 can check: - * - * if (version >= 1080400) ... - * - * Example usage: - * - * uint32_t version; - * uint32_t size = sizeof(version); - * DNSServiceErrorType err = DNSServiceGetProperty(kDNSServiceProperty_DaemonVersion, &version, &size); - * if (!err) printf("Bonjour version is %d.%d\n", version / 10000, version / 100 % 100); - */ - -#define kDNSServiceProperty_DaemonVersion "DaemonVersion" - - -/********************************************************************************************* - * - * Unix Domain Socket access, DNSServiceRef deallocation, and data processing functions - * - *********************************************************************************************/ - -/* DNSServiceRefSockFD() - * - * Access underlying Unix domain socket for an initialized DNSServiceRef. - * The DNS Service Discovery implementation uses this socket to communicate between the client and - * the mDNSResponder daemon. The application MUST NOT directly read from or write to this socket. - * Access to the socket is provided so that it can be used as a kqueue event source, a CFRunLoop - * event source, in a select() loop, etc. When the underlying event management subsystem (kqueue/ - * select/CFRunLoop etc.) indicates to the client that data is available for reading on the - * socket, the client should call DNSServiceProcessResult(), which will extract the daemon's - * reply from the socket, and pass it to the appropriate application callback. By using a run - * loop or select(), results from the daemon can be processed asynchronously. Alternatively, - * a client can choose to fork a thread and have it loop calling "DNSServiceProcessResult(ref);" - * If DNSServiceProcessResult() is called when no data is available for reading on the socket, it - * will block until data does become available, and then process the data and return to the caller. - * When data arrives on the socket, the client is responsible for calling DNSServiceProcessResult(ref) - * in a timely fashion -- if the client allows a large backlog of data to build up the daemon - * may terminate the connection. - * - * sdRef: A DNSServiceRef initialized by any of the DNSService calls. - * - * return value: The DNSServiceRef's underlying socket descriptor, or -1 on - * error. - */ - -int DNSSD_API DNSServiceRefSockFD(DNSServiceRef sdRef); - - -/* DNSServiceProcessResult() - * - * Read a reply from the daemon, calling the appropriate application callback. This call will - * block until the daemon's response is received. Use DNSServiceRefSockFD() in - * conjunction with a run loop or select() to determine the presence of a response from the - * server before calling this function to process the reply without blocking. Call this function - * at any point if it is acceptable to block until the daemon's response arrives. Note that the - * client is responsible for ensuring that DNSServiceProcessResult() is called whenever there is - * a reply from the daemon - the daemon may terminate its connection with a client that does not - * process the daemon's responses. - * - * sdRef: A DNSServiceRef initialized by any of the DNSService calls - * that take a callback parameter. - * - * return value: Returns kDNSServiceErr_NoError on success, otherwise returns - * an error code indicating the specific failure that occurred. - */ - -DNSServiceErrorType DNSSD_API DNSServiceProcessResult(DNSServiceRef sdRef); - - -/* DNSServiceRefDeallocate() - * - * Terminate a connection with the daemon and free memory associated with the DNSServiceRef. - * Any services or records registered with this DNSServiceRef will be deregistered. Any - * Browse, Resolve, or Query operations called with this reference will be terminated. - * - * Note: If the reference's underlying socket is used in a run loop or select() call, it should - * be removed BEFORE DNSServiceRefDeallocate() is called, as this function closes the reference's - * socket. - * - * Note: If the reference was initialized with DNSServiceCreateConnection(), any DNSRecordRefs - * created via this reference will be invalidated by this call - the resource records are - * deregistered, and their DNSRecordRefs may not be used in subsequent functions. Similarly, - * if the reference was initialized with DNSServiceRegister, and an extra resource record was - * added to the service via DNSServiceAddRecord(), the DNSRecordRef created by the Add() call - * is invalidated when this function is called - the DNSRecordRef may not be used in subsequent - * functions. - * - * Note: This call is to be used only with the DNSServiceRef defined by this API. It is - * not compatible with dns_service_discovery_ref objects defined in the legacy Mach-based - * DNSServiceDiscovery.h API. - * - * sdRef: A DNSServiceRef initialized by any of the DNSService calls. - * - */ - -void DNSSD_API DNSServiceRefDeallocate(DNSServiceRef sdRef); - - -/********************************************************************************************* - * - * Domain Enumeration - * - *********************************************************************************************/ - -/* DNSServiceEnumerateDomains() - * - * Asynchronously enumerate domains available for browsing and registration. - * - * The enumeration MUST be cancelled via DNSServiceRefDeallocate() when no more domains - * are to be found. - * - * Note that the names returned are (like all of DNS-SD) UTF-8 strings, - * and are escaped using standard DNS escaping rules. - * (See "Notes on DNS Name Escaping" earlier in this file for more details.) - * A graphical browser displaying a hierarchical tree-structured view should cut - * the names at the bare dots to yield individual labels, then de-escape each - * label according to the escaping rules, and then display the resulting UTF-8 text. - * - * DNSServiceDomainEnumReply Callback Parameters: - * - * sdRef: The DNSServiceRef initialized by DNSServiceEnumerateDomains(). - * - * flags: Possible values are: - * kDNSServiceFlagsMoreComing - * kDNSServiceFlagsAdd - * kDNSServiceFlagsDefault - * - * interfaceIndex: Specifies the interface on which the domain exists. (The index for a given - * interface is determined via the if_nametoindex() family of calls.) - * - * errorCode: Will be kDNSServiceErr_NoError (0) on success, otherwise indicates - * the failure that occurred (other parameters are undefined if errorCode is nonzero). - * - * replyDomain: The name of the domain. - * - * context: The context pointer passed to DNSServiceEnumerateDomains. - * - */ - -typedef void (DNSSD_API *DNSServiceDomainEnumReply) - ( - DNSServiceRef sdRef, - DNSServiceFlags flags, - uint32_t interfaceIndex, - DNSServiceErrorType errorCode, - const char *replyDomain, - void *context - ); - - -/* DNSServiceEnumerateDomains() Parameters: - * - * sdRef: A pointer to an uninitialized DNSServiceRef. If the call succeeds - * then it initializes the DNSServiceRef, returns kDNSServiceErr_NoError, - * and the enumeration operation will run indefinitely until the client - * terminates it by passing this DNSServiceRef to DNSServiceRefDeallocate(). - * - * flags: Possible values are: - * kDNSServiceFlagsBrowseDomains to enumerate domains recommended for browsing. - * kDNSServiceFlagsRegistrationDomains to enumerate domains recommended - * for registration. - * - * interfaceIndex: If non-zero, specifies the interface on which to look for domains. - * (the index for a given interface is determined via the if_nametoindex() - * family of calls.) Most applications will pass 0 to enumerate domains on - * all interfaces. See "Constants for specifying an interface index" for more details. - * - * callBack: The function to be called when a domain is found or the call asynchronously - * fails. - * - * context: An application context pointer which is passed to the callback function - * (may be NULL). - * - * return value: Returns kDNSServiceErr_NoError on success (any subsequent, asynchronous - * errors are delivered to the callback), otherwise returns an error code indicating - * the error that occurred (the callback is not invoked and the DNSServiceRef - * is not initialized). - */ - -DNSServiceErrorType DNSSD_API DNSServiceEnumerateDomains - ( - DNSServiceRef *sdRef, - DNSServiceFlags flags, - uint32_t interfaceIndex, - DNSServiceDomainEnumReply callBack, - void *context /* may be NULL */ - ); - - -/********************************************************************************************* - * - * Service Registration - * - *********************************************************************************************/ - -/* Register a service that is discovered via Browse() and Resolve() calls. - * - * DNSServiceRegisterReply() Callback Parameters: - * - * sdRef: The DNSServiceRef initialized by DNSServiceRegister(). - * - * flags: When a name is successfully registered, the callback will be - * invoked with the kDNSServiceFlagsAdd flag set. When Wide-Area - * DNS-SD is in use, it is possible for a single service to get - * more than one success callback (e.g. one in the "local" multicast - * DNS domain, and another in a wide-area unicast DNS domain). - * If a successfully-registered name later suffers a name conflict - * or similar problem and has to be deregistered, the callback will - * be invoked with the kDNSServiceFlagsAdd flag not set. The callback - * is *not* invoked in the case where the caller explicitly terminates - * the service registration by calling DNSServiceRefDeallocate(ref); - * - * errorCode: Will be kDNSServiceErr_NoError on success, otherwise will - * indicate the failure that occurred (including name conflicts, - * if the kDNSServiceFlagsNoAutoRename flag was used when registering.) - * Other parameters are undefined if errorCode is nonzero. - * - * name: The service name registered (if the application did not specify a name in - * DNSServiceRegister(), this indicates what name was automatically chosen). - * - * regtype: The type of service registered, as it was passed to the callout. - * - * domain: The domain on which the service was registered (if the application did not - * specify a domain in DNSServiceRegister(), this indicates the default domain - * on which the service was registered). - * - * context: The context pointer that was passed to the callout. - * - */ - -typedef void (DNSSD_API *DNSServiceRegisterReply) - ( - DNSServiceRef sdRef, - DNSServiceFlags flags, - DNSServiceErrorType errorCode, - const char *name, - const char *regtype, - const char *domain, - void *context - ); - - -/* DNSServiceRegister() Parameters: - * - * sdRef: A pointer to an uninitialized DNSServiceRef. If the call succeeds - * then it initializes the DNSServiceRef, returns kDNSServiceErr_NoError, - * and the registration will remain active indefinitely until the client - * terminates it by passing this DNSServiceRef to DNSServiceRefDeallocate(). - * - * interfaceIndex: If non-zero, specifies the interface on which to register the service - * (the index for a given interface is determined via the if_nametoindex() - * family of calls.) Most applications will pass 0 to register on all - * available interfaces. See "Constants for specifying an interface index" for more details. - * - * flags: Indicates the renaming behavior on name conflict (most applications - * will pass 0). See flag definitions above for details. - * - * name: If non-NULL, specifies the service name to be registered. - * Most applications will not specify a name, in which case the computer - * name is used (this name is communicated to the client via the callback). - * If a name is specified, it must be 1-63 bytes of UTF-8 text. - * If the name is longer than 63 bytes it will be automatically truncated - * to a legal length, unless the NoAutoRename flag is set, - * in which case kDNSServiceErr_BadParam will be returned. - * - * regtype: The service type followed by the protocol, separated by a dot - * (e.g. "_ftp._tcp"). The service type must be an underscore, followed - * by 1-15 characters, which may be letters, digits, or hyphens. - * The transport protocol must be "_tcp" or "_udp". New service types - * should be registered at . - * - * Additional subtypes of the primary service type (where a service - * type has defined subtypes) follow the primary service type in a - * comma-separated list, with no additional spaces, e.g. - * "_primarytype._tcp,_subtype1,_subtype2,_subtype3" - * Subtypes provide a mechanism for filtered browsing: A client browsing - * for "_primarytype._tcp" will discover all instances of this type; - * a client browsing for "_primarytype._tcp,_subtype2" will discover only - * those instances that were registered with "_subtype2" in their list of - * registered subtypes. - * - * The subtype mechanism can be illustrated with some examples using the - * dns-sd command-line tool: - * - * % dns-sd -R Simple _test._tcp "" 1001 & - * % dns-sd -R Better _test._tcp,HasFeatureA "" 1002 & - * % dns-sd -R Best _test._tcp,HasFeatureA,HasFeatureB "" 1003 & - * - * Now: - * % dns-sd -B _test._tcp # will find all three services - * % dns-sd -B _test._tcp,HasFeatureA # finds "Better" and "Best" - * % dns-sd -B _test._tcp,HasFeatureB # finds only "Best" - * - * Subtype labels may be up to 63 bytes long, and may contain any eight- - * bit byte values, including zero bytes. However, due to the nature of - * using a C-string-based API, conventional DNS escaping must be used for - * dots ('.'), commas (','), backslashes ('\') and zero bytes, as shown below: - * - * % dns-sd -R Test '_test._tcp,s\.one,s\,two,s\\three,s\000four' local 123 - * - * domain: If non-NULL, specifies the domain on which to advertise the service. - * Most applications will not specify a domain, instead automatically - * registering in the default domain(s). - * - * host: If non-NULL, specifies the SRV target host name. Most applications - * will not specify a host, instead automatically using the machine's - * default host name(s). Note that specifying a non-NULL host does NOT - * create an address record for that host - the application is responsible - * for ensuring that the appropriate address record exists, or creating it - * via DNSServiceRegisterRecord(). - * - * port: The port, in network byte order, on which the service accepts connections. - * Pass 0 for a "placeholder" service (i.e. a service that will not be discovered - * by browsing, but will cause a name conflict if another client tries to - * register that same name). Most clients will not use placeholder services. - * - * txtLen: The length of the txtRecord, in bytes. Must be zero if the txtRecord is NULL. - * - * txtRecord: The TXT record rdata. A non-NULL txtRecord MUST be a properly formatted DNS - * TXT record, i.e. ... - * Passing NULL for the txtRecord is allowed as a synonym for txtLen=1, txtRecord="", - * i.e. it creates a TXT record of length one containing a single empty string. - * RFC 1035 doesn't allow a TXT record to contain *zero* strings, so a single empty - * string is the smallest legal DNS TXT record. - * As with the other parameters, the DNSServiceRegister call copies the txtRecord - * data; e.g. if you allocated the storage for the txtRecord parameter with malloc() - * then you can safely free that memory right after the DNSServiceRegister call returns. - * - * callBack: The function to be called when the registration completes or asynchronously - * fails. The client MAY pass NULL for the callback - The client will NOT be notified - * of the default values picked on its behalf, and the client will NOT be notified of any - * asynchronous errors (e.g. out of memory errors, etc.) that may prevent the registration - * of the service. The client may NOT pass the NoAutoRename flag if the callback is NULL. - * The client may still deregister the service at any time via DNSServiceRefDeallocate(). - * - * context: An application context pointer which is passed to the callback function - * (may be NULL). - * - * return value: Returns kDNSServiceErr_NoError on success (any subsequent, asynchronous - * errors are delivered to the callback), otherwise returns an error code indicating - * the error that occurred (the callback is never invoked and the DNSServiceRef - * is not initialized). - */ - -DNSServiceErrorType DNSSD_API DNSServiceRegister - ( - DNSServiceRef *sdRef, - DNSServiceFlags flags, - uint32_t interfaceIndex, - const char *name, /* may be NULL */ - const char *regtype, - const char *domain, /* may be NULL */ - const char *host, /* may be NULL */ - uint16_t port, /* In network byte order */ - uint16_t txtLen, - const void *txtRecord, /* may be NULL */ - DNSServiceRegisterReply callBack, /* may be NULL */ - void *context /* may be NULL */ - ); - - -/* DNSServiceAddRecord() - * - * Add a record to a registered service. The name of the record will be the same as the - * registered service's name. - * The record can later be updated or deregistered by passing the RecordRef initialized - * by this function to DNSServiceUpdateRecord() or DNSServiceRemoveRecord(). - * - * Note that the DNSServiceAddRecord/UpdateRecord/RemoveRecord are *NOT* thread-safe - * with respect to a single DNSServiceRef. If you plan to have multiple threads - * in your program simultaneously add, update, or remove records from the same - * DNSServiceRef, then it's the caller's responsibility to use a mutext lock - * or take similar appropriate precautions to serialize those calls. - * - * Parameters; - * - * sdRef: A DNSServiceRef initialized by DNSServiceRegister(). - * - * RecordRef: A pointer to an uninitialized DNSRecordRef. Upon succesfull completion of this - * call, this ref may be passed to DNSServiceUpdateRecord() or DNSServiceRemoveRecord(). - * If the above DNSServiceRef is passed to DNSServiceRefDeallocate(), RecordRef is also - * invalidated and may not be used further. - * - * flags: Currently ignored, reserved for future use. - * - * rrtype: The type of the record (e.g. kDNSServiceType_TXT, kDNSServiceType_SRV, etc) - * - * rdlen: The length, in bytes, of the rdata. - * - * rdata: The raw rdata to be contained in the added resource record. - * - * ttl: The time to live of the resource record, in seconds. - * Most clients should pass 0 to indicate that the system should - * select a sensible default value. - * - * return value: Returns kDNSServiceErr_NoError on success, otherwise returns an - * error code indicating the error that occurred (the RecordRef is not initialized). - */ - -DNSServiceErrorType DNSSD_API DNSServiceAddRecord - ( - DNSServiceRef sdRef, - DNSRecordRef *RecordRef, - DNSServiceFlags flags, - uint16_t rrtype, - uint16_t rdlen, - const void *rdata, - uint32_t ttl - ); - - -/* DNSServiceUpdateRecord - * - * Update a registered resource record. The record must either be: - * - The primary txt record of a service registered via DNSServiceRegister() - * - A record added to a registered service via DNSServiceAddRecord() - * - An individual record registered by DNSServiceRegisterRecord() - * - * Parameters: - * - * sdRef: A DNSServiceRef that was initialized by DNSServiceRegister() - * or DNSServiceCreateConnection(). - * - * RecordRef: A DNSRecordRef initialized by DNSServiceAddRecord, or NULL to update the - * service's primary txt record. - * - * flags: Currently ignored, reserved for future use. - * - * rdlen: The length, in bytes, of the new rdata. - * - * rdata: The new rdata to be contained in the updated resource record. - * - * ttl: The time to live of the updated resource record, in seconds. - * Most clients should pass 0 to indicate that the system should - * select a sensible default value. - * - * return value: Returns kDNSServiceErr_NoError on success, otherwise returns an - * error code indicating the error that occurred. - */ - -DNSServiceErrorType DNSSD_API DNSServiceUpdateRecord - ( - DNSServiceRef sdRef, - DNSRecordRef RecordRef, /* may be NULL */ - DNSServiceFlags flags, - uint16_t rdlen, - const void *rdata, - uint32_t ttl - ); - - -/* DNSServiceRemoveRecord - * - * Remove a record previously added to a service record set via DNSServiceAddRecord(), or deregister - * an record registered individually via DNSServiceRegisterRecord(). - * - * Parameters: - * - * sdRef: A DNSServiceRef initialized by DNSServiceRegister() (if the - * record being removed was registered via DNSServiceAddRecord()) or by - * DNSServiceCreateConnection() (if the record being removed was registered via - * DNSServiceRegisterRecord()). - * - * recordRef: A DNSRecordRef initialized by a successful call to DNSServiceAddRecord() - * or DNSServiceRegisterRecord(). - * - * flags: Currently ignored, reserved for future use. - * - * return value: Returns kDNSServiceErr_NoError on success, otherwise returns an - * error code indicating the error that occurred. - */ - -DNSServiceErrorType DNSSD_API DNSServiceRemoveRecord - ( - DNSServiceRef sdRef, - DNSRecordRef RecordRef, - DNSServiceFlags flags - ); - - -/********************************************************************************************* - * - * Service Discovery - * - *********************************************************************************************/ - -/* Browse for instances of a service. - * - * DNSServiceBrowseReply() Parameters: - * - * sdRef: The DNSServiceRef initialized by DNSServiceBrowse(). - * - * flags: Possible values are kDNSServiceFlagsMoreComing and kDNSServiceFlagsAdd. - * See flag definitions for details. - * - * interfaceIndex: The interface on which the service is advertised. This index should - * be passed to DNSServiceResolve() when resolving the service. - * - * errorCode: Will be kDNSServiceErr_NoError (0) on success, otherwise will - * indicate the failure that occurred. Other parameters are undefined if - * the errorCode is nonzero. - * - * serviceName: The discovered service name. This name should be displayed to the user, - * and stored for subsequent use in the DNSServiceResolve() call. - * - * regtype: The service type, which is usually (but not always) the same as was passed - * to DNSServiceBrowse(). One case where the discovered service type may - * not be the same as the requested service type is when using subtypes: - * The client may want to browse for only those ftp servers that allow - * anonymous connections. The client will pass the string "_ftp._tcp,_anon" - * to DNSServiceBrowse(), but the type of the service that's discovered - * is simply "_ftp._tcp". The regtype for each discovered service instance - * should be stored along with the name, so that it can be passed to - * DNSServiceResolve() when the service is later resolved. - * - * domain: The domain of the discovered service instance. This may or may not be the - * same as the domain that was passed to DNSServiceBrowse(). The domain for each - * discovered service instance should be stored along with the name, so that - * it can be passed to DNSServiceResolve() when the service is later resolved. - * - * context: The context pointer that was passed to the callout. - * - */ - -typedef void (DNSSD_API *DNSServiceBrowseReply) - ( - DNSServiceRef sdRef, - DNSServiceFlags flags, - uint32_t interfaceIndex, - DNSServiceErrorType errorCode, - const char *serviceName, - const char *regtype, - const char *replyDomain, - void *context - ); - - -/* DNSServiceBrowse() Parameters: - * - * sdRef: A pointer to an uninitialized DNSServiceRef. If the call succeeds - * then it initializes the DNSServiceRef, returns kDNSServiceErr_NoError, - * and the browse operation will run indefinitely until the client - * terminates it by passing this DNSServiceRef to DNSServiceRefDeallocate(). - * - * flags: Currently ignored, reserved for future use. - * - * interfaceIndex: If non-zero, specifies the interface on which to browse for services - * (the index for a given interface is determined via the if_nametoindex() - * family of calls.) Most applications will pass 0 to browse on all available - * interfaces. See "Constants for specifying an interface index" for more details. - * - * regtype: The service type being browsed for followed by the protocol, separated by a - * dot (e.g. "_ftp._tcp"). The transport protocol must be "_tcp" or "_udp". - * A client may optionally specify a single subtype to perform filtered browsing: - * e.g. browsing for "_primarytype._tcp,_subtype" will discover only those - * instances of "_primarytype._tcp" that were registered specifying "_subtype" - * in their list of registered subtypes. - * - * domain: If non-NULL, specifies the domain on which to browse for services. - * Most applications will not specify a domain, instead browsing on the - * default domain(s). - * - * callBack: The function to be called when an instance of the service being browsed for - * is found, or if the call asynchronously fails. - * - * context: An application context pointer which is passed to the callback function - * (may be NULL). - * - * return value: Returns kDNSServiceErr_NoError on success (any subsequent, asynchronous - * errors are delivered to the callback), otherwise returns an error code indicating - * the error that occurred (the callback is not invoked and the DNSServiceRef - * is not initialized). - */ - -DNSServiceErrorType DNSSD_API DNSServiceBrowse - ( - DNSServiceRef *sdRef, - DNSServiceFlags flags, - uint32_t interfaceIndex, - const char *regtype, - const char *domain, /* may be NULL */ - DNSServiceBrowseReply callBack, - void *context /* may be NULL */ - ); - - -/* DNSServiceResolve() - * - * Resolve a service name discovered via DNSServiceBrowse() to a target host name, port number, and - * txt record. - * - * Note: Applications should NOT use DNSServiceResolve() solely for txt record monitoring - use - * DNSServiceQueryRecord() instead, as it is more efficient for this task. - * - * Note: When the desired results have been returned, the client MUST terminate the resolve by calling - * DNSServiceRefDeallocate(). - * - * Note: DNSServiceResolve() behaves correctly for typical services that have a single SRV record - * and a single TXT record. To resolve non-standard services with multiple SRV or TXT records, - * DNSServiceQueryRecord() should be used. - * - * DNSServiceResolveReply Callback Parameters: - * - * sdRef: The DNSServiceRef initialized by DNSServiceResolve(). - * - * flags: Possible values: kDNSServiceFlagsMoreComing - * - * interfaceIndex: The interface on which the service was resolved. - * - * errorCode: Will be kDNSServiceErr_NoError (0) on success, otherwise will - * indicate the failure that occurred. Other parameters are undefined if - * the errorCode is nonzero. - * - * fullname: The full service domain name, in the form ... - * (This name is escaped following standard DNS rules, making it suitable for - * passing to standard system DNS APIs such as res_query(), or to the - * special-purpose functions included in this API that take fullname parameters. - * See "Notes on DNS Name Escaping" earlier in this file for more details.) - * - * hosttarget: The target hostname of the machine providing the service. This name can - * be passed to functions like gethostbyname() to identify the host's IP address. - * - * port: The port, in network byte order, on which connections are accepted for this service. - * - * txtLen: The length of the txt record, in bytes. - * - * txtRecord: The service's primary txt record, in standard txt record format. - * - * context: The context pointer that was passed to the callout. - * - * NOTE: In earlier versions of this header file, the txtRecord parameter was declared "const char *" - * This is incorrect, since it contains length bytes which are values in the range 0 to 255, not -128 to +127. - * Depending on your compiler settings, this change may cause signed/unsigned mismatch warnings. - * These should be fixed by updating your own callback function definition to match the corrected - * function signature using "const unsigned char *txtRecord". Making this change may also fix inadvertent - * bugs in your callback function, where it could have incorrectly interpreted a length byte with value 250 - * as being -6 instead, with various bad consequences ranging from incorrect operation to software crashes. - * If you need to maintain portable code that will compile cleanly with both the old and new versions of - * this header file, you should update your callback function definition to use the correct unsigned value, - * and then in the place where you pass your callback function to DNSServiceResolve(), use a cast to eliminate - * the compiler warning, e.g.: - * DNSServiceResolve(sd, flags, index, name, regtype, domain, (DNSServiceResolveReply)MyCallback, context); - * This will ensure that your code compiles cleanly without warnings (and more importantly, works correctly) - * with both the old header and with the new corrected version. - * - */ - -typedef void (DNSSD_API *DNSServiceResolveReply) - ( - DNSServiceRef sdRef, - DNSServiceFlags flags, - uint32_t interfaceIndex, - DNSServiceErrorType errorCode, - const char *fullname, - const char *hosttarget, - uint16_t port, /* In network byte order */ - uint16_t txtLen, - const unsigned char *txtRecord, - void *context - ); - - -/* DNSServiceResolve() Parameters - * - * sdRef: A pointer to an uninitialized DNSServiceRef. If the call succeeds - * then it initializes the DNSServiceRef, returns kDNSServiceErr_NoError, - * and the resolve operation will run indefinitely until the client - * terminates it by passing this DNSServiceRef to DNSServiceRefDeallocate(). - * - * flags: Specifying kDNSServiceFlagsForceMulticast will cause query to be - * performed with a link-local mDNS query, even if the name is an - * apparently non-local name (i.e. a name not ending in ".local.") - * - * interfaceIndex: The interface on which to resolve the service. If this resolve call is - * as a result of a currently active DNSServiceBrowse() operation, then the - * interfaceIndex should be the index reported in the DNSServiceBrowseReply - * callback. If this resolve call is using information previously saved - * (e.g. in a preference file) for later use, then use interfaceIndex 0, because - * the desired service may now be reachable via a different physical interface. - * See "Constants for specifying an interface index" for more details. - * - * name: The name of the service instance to be resolved, as reported to the - * DNSServiceBrowseReply() callback. - * - * regtype: The type of the service instance to be resolved, as reported to the - * DNSServiceBrowseReply() callback. - * - * domain: The domain of the service instance to be resolved, as reported to the - * DNSServiceBrowseReply() callback. - * - * callBack: The function to be called when a result is found, or if the call - * asynchronously fails. - * - * context: An application context pointer which is passed to the callback function - * (may be NULL). - * - * return value: Returns kDNSServiceErr_NoError on success (any subsequent, asynchronous - * errors are delivered to the callback), otherwise returns an error code indicating - * the error that occurred (the callback is never invoked and the DNSServiceRef - * is not initialized). - */ - -DNSServiceErrorType DNSSD_API DNSServiceResolve - ( - DNSServiceRef *sdRef, - DNSServiceFlags flags, - uint32_t interfaceIndex, - const char *name, - const char *regtype, - const char *domain, - DNSServiceResolveReply callBack, - void *context /* may be NULL */ - ); - - -/********************************************************************************************* - * - * Querying Individual Specific Records - * - *********************************************************************************************/ - -/* DNSServiceQueryRecord - * - * Query for an arbitrary DNS record. - * - * DNSServiceQueryRecordReply() Callback Parameters: - * - * sdRef: The DNSServiceRef initialized by DNSServiceQueryRecord(). - * - * flags: Possible values are kDNSServiceFlagsMoreComing and - * kDNSServiceFlagsAdd. The Add flag is NOT set for PTR records - * with a ttl of 0, i.e. "Remove" events. - * - * interfaceIndex: The interface on which the query was resolved (the index for a given - * interface is determined via the if_nametoindex() family of calls). - * See "Constants for specifying an interface index" for more details. - * - * errorCode: Will be kDNSServiceErr_NoError on success, otherwise will - * indicate the failure that occurred. Other parameters are undefined if - * errorCode is nonzero. - * - * fullname: The resource record's full domain name. - * - * rrtype: The resource record's type (e.g. kDNSServiceType_PTR, kDNSServiceType_SRV, etc) - * - * rrclass: The class of the resource record (usually kDNSServiceClass_IN). - * - * rdlen: The length, in bytes, of the resource record rdata. - * - * rdata: The raw rdata of the resource record. - * - * ttl: If the client wishes to cache the result for performance reasons, - * the TTL indicates how long the client may legitimately hold onto - * this result, in seconds. After the TTL expires, the client should - * consider the result no longer valid, and if it requires this data - * again, it should be re-fetched with a new query. Of course, this - * only applies to clients that cancel the asynchronous operation when - * they get a result. Clients that leave the asynchronous operation - * running can safely assume that the data remains valid until they - * get another callback telling them otherwise. - * - * context: The context pointer that was passed to the callout. - * - */ - -typedef void (DNSSD_API *DNSServiceQueryRecordReply) - ( - DNSServiceRef sdRef, - DNSServiceFlags flags, - uint32_t interfaceIndex, - DNSServiceErrorType errorCode, - const char *fullname, - uint16_t rrtype, - uint16_t rrclass, - uint16_t rdlen, - const void *rdata, - uint32_t ttl, - void *context - ); - - -/* DNSServiceQueryRecord() Parameters: - * - * sdRef: A pointer to an uninitialized DNSServiceRef. If the call succeeds - * then it initializes the DNSServiceRef, returns kDNSServiceErr_NoError, - * and the query operation will run indefinitely until the client - * terminates it by passing this DNSServiceRef to DNSServiceRefDeallocate(). - * - * flags: kDNSServiceFlagsForceMulticast or kDNSServiceFlagsLongLivedQuery. - * Pass kDNSServiceFlagsLongLivedQuery to create a "long-lived" unicast - * query in a non-local domain. Without setting this flag, unicast queries - * will be one-shot - that is, only answers available at the time of the call - * will be returned. By setting this flag, answers (including Add and Remove - * events) that become available after the initial call is made will generate - * callbacks. This flag has no effect on link-local multicast queries. - * - * interfaceIndex: If non-zero, specifies the interface on which to issue the query - * (the index for a given interface is determined via the if_nametoindex() - * family of calls.) Passing 0 causes the name to be queried for on all - * interfaces. See "Constants for specifying an interface index" for more details. - * - * fullname: The full domain name of the resource record to be queried for. - * - * rrtype: The numerical type of the resource record to be queried for - * (e.g. kDNSServiceType_PTR, kDNSServiceType_SRV, etc) - * - * rrclass: The class of the resource record (usually kDNSServiceClass_IN). - * - * callBack: The function to be called when a result is found, or if the call - * asynchronously fails. - * - * context: An application context pointer which is passed to the callback function - * (may be NULL). - * - * return value: Returns kDNSServiceErr_NoError on success (any subsequent, asynchronous - * errors are delivered to the callback), otherwise returns an error code indicating - * the error that occurred (the callback is never invoked and the DNSServiceRef - * is not initialized). - */ - -DNSServiceErrorType DNSSD_API DNSServiceQueryRecord - ( - DNSServiceRef *sdRef, - DNSServiceFlags flags, - uint32_t interfaceIndex, - const char *fullname, - uint16_t rrtype, - uint16_t rrclass, - DNSServiceQueryRecordReply callBack, - void *context /* may be NULL */ - ); - - -/********************************************************************************************* - * - * Unified lookup of both IPv4 and IPv6 addresses for a fully qualified hostname - * - *********************************************************************************************/ - -/* DNSServiceGetAddrInfo - * - * Queries for the IP address of a hostname by using either Multicast or Unicast DNS. - * - * DNSServiceGetAddrInfoReply() parameters: - * - * sdRef: The DNSServiceRef initialized by DNSServiceGetAddrInfo(). - * - * flags: Possible values are kDNSServiceFlagsMoreComing and - * kDNSServiceFlagsAdd. - * - * interfaceIndex: The interface to which the answers pertain. - * - * errorCode: Will be kDNSServiceErr_NoError on success, otherwise will - * indicate the failure that occurred. Other parameters are - * undefined if errorCode is nonzero. - * - * hostname: The fully qualified domain name of the host to be queried for. - * - * address: IPv4 or IPv6 address. - * - * ttl: If the client wishes to cache the result for performance reasons, - * the TTL indicates how long the client may legitimately hold onto - * this result, in seconds. After the TTL expires, the client should - * consider the result no longer valid, and if it requires this data - * again, it should be re-fetched with a new query. Of course, this - * only applies to clients that cancel the asynchronous operation when - * they get a result. Clients that leave the asynchronous operation - * running can safely assume that the data remains valid until they - * get another callback telling them otherwise. - * - * context: The context pointer that was passed to the callout. - * - */ - -typedef void (DNSSD_API *DNSServiceGetAddrInfoReply) - ( - DNSServiceRef sdRef, - DNSServiceFlags flags, - uint32_t interfaceIndex, - DNSServiceErrorType errorCode, - const char *hostname, - const struct sockaddr *address, - uint32_t ttl, - void *context - ); - - -/* DNSServiceGetAddrInfo() Parameters: - * - * sdRef: A pointer to an uninitialized DNSServiceRef. If the call succeeds then it - * initializes the DNSServiceRef, returns kDNSServiceErr_NoError, and the query - * begins and will last indefinitely until the client terminates the query - * by passing this DNSServiceRef to DNSServiceRefDeallocate(). - * - * flags: kDNSServiceFlagsForceMulticast or kDNSServiceFlagsLongLivedQuery. - * Pass kDNSServiceFlagsLongLivedQuery to create a "long-lived" unicast - * query in a non-local domain. Without setting this flag, unicast queries - * will be one-shot - that is, only answers available at the time of the call - * will be returned. By setting this flag, answers (including Add and Remove - * events) that become available after the initial call is made will generate - * callbacks. This flag has no effect on link-local multicast queries. - * - * interfaceIndex: The interface on which to issue the query. Passing 0 causes the query to be - * sent on all active interfaces via Multicast or the primary interface via Unicast. - * - * protocol: Pass in kDNSServiceProtocol_IPv4 to look up IPv4 addresses, or kDNSServiceProtocol_IPv6 - * to look up IPv6 addresses, or both to look up both kinds. If neither flag is - * set, the system will apply an intelligent heuristic, which is (currently) - * that it will attempt to look up both, except: - * - * * If "hostname" is a wide-area unicast DNS hostname (i.e. not a ".local." name) - * but this host has no routable IPv6 address, then the call will not try to - * look up IPv6 addresses for "hostname", since any addresses it found would be - * unlikely to be of any use anyway. Similarly, if this host has no routable - * IPv4 address, the call will not try to look up IPv4 addresses for "hostname". - * - * hostname: The fully qualified domain name of the host to be queried for. - * - * callBack: The function to be called when the query succeeds or fails asynchronously. - * - * context: An application context pointer which is passed to the callback function - * (may be NULL). - * - * return value: Returns kDNSServiceErr_NoError on success (any subsequent, asynchronous - * errors are delivered to the callback), otherwise returns an error code indicating - * the error that occurred. - */ - -DNSServiceErrorType DNSSD_API DNSServiceGetAddrInfo - ( - DNSServiceRef *sdRef, - DNSServiceFlags flags, - uint32_t interfaceIndex, - DNSServiceProtocol protocol, - const char *hostname, - DNSServiceGetAddrInfoReply callBack, - void *context /* may be NULL */ - ); - - -/********************************************************************************************* - * - * Special Purpose Calls: - * DNSServiceCreateConnection(), DNSServiceRegisterRecord(), DNSServiceReconfirmRecord() - * (most applications will not use these) - * - *********************************************************************************************/ - -/* DNSServiceCreateConnection() - * - * Create a connection to the daemon allowing efficient registration of - * multiple individual records. - * - * Parameters: - * - * sdRef: A pointer to an uninitialized DNSServiceRef. Deallocating - * the reference (via DNSServiceRefDeallocate()) severs the - * connection and deregisters all records registered on this connection. - * - * return value: Returns kDNSServiceErr_NoError on success, otherwise returns - * an error code indicating the specific failure that occurred (in which - * case the DNSServiceRef is not initialized). - */ - -DNSServiceErrorType DNSSD_API DNSServiceCreateConnection(DNSServiceRef *sdRef); - - -/* DNSServiceRegisterRecord - * - * Register an individual resource record on a connected DNSServiceRef. - * - * Note that name conflicts occurring for records registered via this call must be handled - * by the client in the callback. - * - * DNSServiceRegisterRecordReply() parameters: - * - * sdRef: The connected DNSServiceRef initialized by - * DNSServiceCreateConnection(). - * - * RecordRef: The DNSRecordRef initialized by DNSServiceRegisterRecord(). If the above - * DNSServiceRef is passed to DNSServiceRefDeallocate(), this DNSRecordRef is - * invalidated, and may not be used further. - * - * flags: Currently unused, reserved for future use. - * - * errorCode: Will be kDNSServiceErr_NoError on success, otherwise will - * indicate the failure that occurred (including name conflicts.) - * Other parameters are undefined if errorCode is nonzero. - * - * context: The context pointer that was passed to the callout. - * - */ - - typedef void (DNSSD_API *DNSServiceRegisterRecordReply) - ( - DNSServiceRef sdRef, - DNSRecordRef RecordRef, - DNSServiceFlags flags, - DNSServiceErrorType errorCode, - void *context - ); - - -/* DNSServiceRegisterRecord() Parameters: - * - * sdRef: A DNSServiceRef initialized by DNSServiceCreateConnection(). - * - * RecordRef: A pointer to an uninitialized DNSRecordRef. Upon succesfull completion of this - * call, this ref may be passed to DNSServiceUpdateRecord() or DNSServiceRemoveRecord(). - * (To deregister ALL records registered on a single connected DNSServiceRef - * and deallocate each of their corresponding DNSServiceRecordRefs, call - * DNSServiceRefDeallocate()). - * - * flags: Possible values are kDNSServiceFlagsShared or kDNSServiceFlagsUnique - * (see flag type definitions for details). - * - * interfaceIndex: If non-zero, specifies the interface on which to register the record - * (the index for a given interface is determined via the if_nametoindex() - * family of calls.) Passing 0 causes the record to be registered on all interfaces. - * See "Constants for specifying an interface index" for more details. - * - * fullname: The full domain name of the resource record. - * - * rrtype: The numerical type of the resource record (e.g. kDNSServiceType_PTR, kDNSServiceType_SRV, etc) - * - * rrclass: The class of the resource record (usually kDNSServiceClass_IN) - * - * rdlen: Length, in bytes, of the rdata. - * - * rdata: A pointer to the raw rdata, as it is to appear in the DNS record. - * - * ttl: The time to live of the resource record, in seconds. - * Most clients should pass 0 to indicate that the system should - * select a sensible default value. - * - * callBack: The function to be called when a result is found, or if the call - * asynchronously fails (e.g. because of a name conflict.) - * - * context: An application context pointer which is passed to the callback function - * (may be NULL). - * - * return value: Returns kDNSServiceErr_NoError on success (any subsequent, asynchronous - * errors are delivered to the callback), otherwise returns an error code indicating - * the error that occurred (the callback is never invoked and the DNSRecordRef is - * not initialized). - */ - -DNSServiceErrorType DNSSD_API DNSServiceRegisterRecord - ( - DNSServiceRef sdRef, - DNSRecordRef *RecordRef, - DNSServiceFlags flags, - uint32_t interfaceIndex, - const char *fullname, - uint16_t rrtype, - uint16_t rrclass, - uint16_t rdlen, - const void *rdata, - uint32_t ttl, - DNSServiceRegisterRecordReply callBack, - void *context /* may be NULL */ - ); - - -/* DNSServiceReconfirmRecord - * - * Instruct the daemon to verify the validity of a resource record that appears - * to be out of date (e.g. because TCP connection to a service's target failed.) - * Causes the record to be flushed from the daemon's cache (as well as all other - * daemons' caches on the network) if the record is determined to be invalid. - * Use this routine conservatively. Reconfirming a record necessarily consumes - * network bandwidth, so this should not be done indiscriminately. - * - * Parameters: - * - * flags: Pass kDNSServiceFlagsForce to force immediate deletion of record, - * instead of after some number of reconfirmation queries have gone unanswered. - * - * interfaceIndex: Specifies the interface of the record in question. - * The caller must specify the interface. - * This API (by design) causes increased network traffic, so it requires - * the caller to be precise about which record should be reconfirmed. - * It is not possible to pass zero for the interface index to perform - * a "wildcard" reconfirmation, where *all* matching records are reconfirmed. - * - * fullname: The resource record's full domain name. - * - * rrtype: The resource record's type (e.g. kDNSServiceType_PTR, kDNSServiceType_SRV, etc) - * - * rrclass: The class of the resource record (usually kDNSServiceClass_IN). - * - * rdlen: The length, in bytes, of the resource record rdata. - * - * rdata: The raw rdata of the resource record. - * - */ - -DNSServiceErrorType DNSSD_API DNSServiceReconfirmRecord - ( - DNSServiceFlags flags, - uint32_t interfaceIndex, - const char *fullname, - uint16_t rrtype, - uint16_t rrclass, - uint16_t rdlen, - const void *rdata - ); - - -/********************************************************************************************* - * - * NAT Port Mapping - * - *********************************************************************************************/ - -/* DNSServiceNATPortMappingCreate - * - * Request a port mapping in the NAT gateway, which maps a port on the local machine - * to an external port on the NAT. The NAT should support either the NAT-PMP or the UPnP IGD - * protocol for this API to create a successful mapping. - * - * The port mapping will be renewed indefinitely until the client process exits, or - * explicitly terminates the port mapping request by calling DNSServiceRefDeallocate(). - * The client callback will be invoked, informing the client of the NAT gateway's - * external IP address and the external port that has been allocated for this client. - * The client should then record this external IP address and port using whatever - * directory service mechanism it is using to enable peers to connect to it. - * (Clients advertising services using Wide-Area DNS-SD DO NOT need to use this API - * -- when a client calls DNSServiceRegister() NAT mappings are automatically created - * and the external IP address and port for the service are recorded in the global DNS. - * Only clients using some directory mechanism other than Wide-Area DNS-SD need to use - * this API to explicitly map their own ports.) - * - * It's possible that the client callback could be called multiple times, for example - * if the NAT gateway's IP address changes, or if a configuration change results in a - * different external port being mapped for this client. Over the lifetime of any long-lived - * port mapping, the client should be prepared to handle these notifications of changes - * in the environment, and should update its recorded address and/or port as appropriate. - * - * NOTE: There are two unusual aspects of how the DNSServiceNATPortMappingCreate API works, - * which were intentionally designed to help simplify client code: - * - * 1. It's not an error to request a NAT mapping when the machine is not behind a NAT gateway. - * In other NAT mapping APIs, if you request a NAT mapping and the machine is not behind a NAT - * gateway, then the API returns an error code -- it can't get you a NAT mapping if there's no - * NAT gateway. The DNSServiceNATPortMappingCreate API takes a different view. Working out - * whether or not you need a NAT mapping can be tricky and non-obvious, particularly on - * a machine with multiple active network interfaces. Rather than make every client recreate - * this logic for deciding whether a NAT mapping is required, the PortMapping API does that - * work for you. If the client calls the PortMapping API when the machine already has a - * routable public IP address, then instead of complaining about it and giving an error, - * the PortMapping API just invokes your callback, giving the machine's public address - * and your own port number. This means you don't need to write code to work out whether - * your client needs to call the PortMapping API -- just call it anyway, and if it wasn't - * necessary, no harm is done: - * - * - If the machine already has a routable public IP address, then your callback - * will just be invoked giving your own address and port. - * - If a NAT mapping is required and obtained, then your callback will be invoked - * giving you the external address and port. - * - If a NAT mapping is required but not obtained from the local NAT gateway, - * or the machine has no network connectivity, then your callback will be - * invoked giving zero address and port. - * - * 2. In other NAT mapping APIs, if a laptop computer is put to sleep and woken up on a new - * network, it's the client's job to notice this, and work out whether a NAT mapping - * is required on the new network, and make a new NAT mapping request if necessary. - * The DNSServiceNATPortMappingCreate API does this for you, automatically. - * The client just needs to make one call to the PortMapping API, and its callback will - * be invoked any time the mapping state changes. This property complements point (1) above. - * If the client didn't make a NAT mapping request just because it determined that one was - * not required at that particular moment in time, the client would then have to monitor - * for network state changes to determine if a NAT port mapping later became necessary. - * By unconditionally making a NAT mapping request, even when a NAT mapping not to be - * necessary, the PortMapping API will then begin monitoring network state changes on behalf of - * the client, and if a NAT mapping later becomes necessary, it will automatically create a NAT - * mapping and inform the client with a new callback giving the new address and port information. - * - * DNSServiceNATPortMappingReply() parameters: - * - * sdRef: The DNSServiceRef initialized by DNSServiceNATPortMappingCreate(). - * - * flags: Currently unused, reserved for future use. - * - * interfaceIndex: The interface through which the NAT gateway is reached. - * - * errorCode: Will be kDNSServiceErr_NoError on success. - * Will be kDNSServiceErr_DoubleNAT when the NAT gateway is itself behind one or - * more layers of NAT, in which case the other parameters have the defined values. - * For other failures, will indicate the failure that occurred, and the other - * parameters are undefined. - * - * externalAddress: Four byte IPv4 address in network byte order. - * - * protocol: Will be kDNSServiceProtocol_UDP or kDNSServiceProtocol_TCP or both. - * - * internalPort: The port on the local machine that was mapped. - * - * externalPort: The actual external port in the NAT gateway that was mapped. - * This is likely to be different than the requested external port. - * - * ttl: The lifetime of the NAT port mapping created on the gateway. - * This controls how quickly stale mappings will be garbage-collected - * if the client machine crashes, suffers a power failure, is disconnected - * from the network, or suffers some other unfortunate demise which - * causes it to vanish without explicitly removing its NAT port mapping. - * It's possible that the ttl value will differ from the requested ttl value. - * - * context: The context pointer that was passed to the callout. - * - */ - -typedef void (DNSSD_API *DNSServiceNATPortMappingReply) - ( - DNSServiceRef sdRef, - DNSServiceFlags flags, - uint32_t interfaceIndex, - DNSServiceErrorType errorCode, - uint32_t externalAddress, /* four byte IPv4 address in network byte order */ - DNSServiceProtocol protocol, - uint16_t internalPort, /* In network byte order */ - uint16_t externalPort, /* In network byte order and may be different than the requested port */ - uint32_t ttl, /* may be different than the requested ttl */ - void *context - ); - - -/* DNSServiceNATPortMappingCreate() Parameters: - * - * sdRef: A pointer to an uninitialized DNSServiceRef. If the call succeeds then it - * initializes the DNSServiceRef, returns kDNSServiceErr_NoError, and the nat - * port mapping will last indefinitely until the client terminates the port - * mapping request by passing this DNSServiceRef to DNSServiceRefDeallocate(). - * - * flags: Currently ignored, reserved for future use. - * - * interfaceIndex: The interface on which to create port mappings in a NAT gateway. Passing 0 causes - * the port mapping request to be sent on the primary interface. - * - * protocol: To request a port mapping, pass in kDNSServiceProtocol_UDP, or kDNSServiceProtocol_TCP, - * or (kDNSServiceProtocol_UDP | kDNSServiceProtocol_TCP) to map both. - * The local listening port number must also be specified in the internalPort parameter. - * To just discover the NAT gateway's external IP address, pass zero for protocol, - * internalPort, externalPort and ttl. - * - * internalPort: The port number in network byte order on the local machine which is listening for packets. - * - * externalPort: The requested external port in network byte order in the NAT gateway that you would - * like to map to the internal port. Pass 0 if you don't care which external port is chosen for you. - * - * ttl: The requested renewal period of the NAT port mapping, in seconds. - * If the client machine crashes, suffers a power failure, is disconnected from - * the network, or suffers some other unfortunate demise which causes it to vanish - * unexpectedly without explicitly removing its NAT port mappings, then the NAT gateway - * will garbage-collect old stale NAT port mappings when their lifetime expires. - * Requesting a short TTL causes such orphaned mappings to be garbage-collected - * more promptly, but consumes system resources and network bandwidth with - * frequent renewal packets to keep the mapping from expiring. - * Requesting a long TTL is more efficient on the network, but in the event of the - * client vanishing, stale NAT port mappings will not be garbage-collected as quickly. - * Most clients should pass 0 to use a system-wide default value. - * - * callBack: The function to be called when the port mapping request succeeds or fails asynchronously. - * - * context: An application context pointer which is passed to the callback function - * (may be NULL). - * - * return value: Returns kDNSServiceErr_NoError on success (any subsequent, asynchronous - * errors are delivered to the callback), otherwise returns an error code indicating - * the error that occurred. - * - * If you don't actually want a port mapped, and are just calling the API - * because you want to find out the NAT's external IP address (e.g. for UI - * display) then pass zero for protocol, internalPort, externalPort and ttl. - */ - -DNSServiceErrorType DNSSD_API DNSServiceNATPortMappingCreate - ( - DNSServiceRef *sdRef, - DNSServiceFlags flags, - uint32_t interfaceIndex, - DNSServiceProtocol protocol, /* TCP and/or UDP */ - uint16_t internalPort, /* network byte order */ - uint16_t externalPort, /* network byte order */ - uint32_t ttl, /* time to live in seconds */ - DNSServiceNATPortMappingReply callBack, - void *context /* may be NULL */ - ); - - -/********************************************************************************************* - * - * General Utility Functions - * - *********************************************************************************************/ - -/* DNSServiceConstructFullName() - * - * Concatenate a three-part domain name (as returned by the above callbacks) into a - * properly-escaped full domain name. Note that callbacks in the above functions ALREADY ESCAPE - * strings where necessary. - * - * Parameters: - * - * fullName: A pointer to a buffer that where the resulting full domain name is to be written. - * The buffer must be kDNSServiceMaxDomainName (1009) bytes in length to - * accommodate the longest legal domain name without buffer overrun. - * - * service: The service name - any dots or backslashes must NOT be escaped. - * May be NULL (to construct a PTR record name, e.g. - * "_ftp._tcp.apple.com."). - * - * regtype: The service type followed by the protocol, separated by a dot - * (e.g. "_ftp._tcp"). - * - * domain: The domain name, e.g. "apple.com.". Literal dots or backslashes, - * if any, must be escaped, e.g. "1st\. Floor.apple.com." - * - * return value: Returns kDNSServiceErr_NoError (0) on success, kDNSServiceErr_BadParam on error. - * - */ - -DNSServiceErrorType DNSSD_API DNSServiceConstructFullName - ( - char * const fullName, - const char * const service, /* may be NULL */ - const char * const regtype, - const char * const domain - ); - - -/********************************************************************************************* - * - * TXT Record Construction Functions - * - *********************************************************************************************/ - -/* - * A typical calling sequence for TXT record construction is something like: - * - * Client allocates storage for TXTRecord data (e.g. declare buffer on the stack) - * TXTRecordCreate(); - * TXTRecordSetValue(); - * TXTRecordSetValue(); - * TXTRecordSetValue(); - * ... - * DNSServiceRegister( ... TXTRecordGetLength(), TXTRecordGetBytesPtr() ... ); - * TXTRecordDeallocate(); - * Explicitly deallocate storage for TXTRecord data (if not allocated on the stack) - */ - - -/* TXTRecordRef - * - * Opaque internal data type. - * Note: Represents a DNS-SD TXT record. - */ - -typedef union _TXTRecordRef_t { char PrivateData[16]; char *ForceNaturalAlignment; } TXTRecordRef; - - -/* TXTRecordCreate() - * - * Creates a new empty TXTRecordRef referencing the specified storage. - * - * If the buffer parameter is NULL, or the specified storage size is not - * large enough to hold a key subsequently added using TXTRecordSetValue(), - * then additional memory will be added as needed using malloc(). - * - * On some platforms, when memory is low, malloc() may fail. In this - * case, TXTRecordSetValue() will return kDNSServiceErr_NoMemory, and this - * error condition will need to be handled as appropriate by the caller. - * - * You can avoid the need to handle this error condition if you ensure - * that the storage you initially provide is large enough to hold all - * the key/value pairs that are to be added to the record. - * The caller can precompute the exact length required for all of the - * key/value pairs to be added, or simply provide a fixed-sized buffer - * known in advance to be large enough. - * A no-value (key-only) key requires (1 + key length) bytes. - * A key with empty value requires (1 + key length + 1) bytes. - * A key with non-empty value requires (1 + key length + 1 + value length). - * For most applications, DNS-SD TXT records are generally - * less than 100 bytes, so in most cases a simple fixed-sized - * 256-byte buffer will be more than sufficient. - * Recommended size limits for DNS-SD TXT Records are discussed in - * - * - * Note: When passing parameters to and from these TXT record APIs, - * the key name does not include the '=' character. The '=' character - * is the separator between the key and value in the on-the-wire - * packet format; it is not part of either the key or the value. - * - * txtRecord: A pointer to an uninitialized TXTRecordRef. - * - * bufferLen: The size of the storage provided in the "buffer" parameter. - * - * buffer: Optional caller-supplied storage used to hold the TXTRecord data. - * This storage must remain valid for as long as - * the TXTRecordRef. - */ - -void DNSSD_API TXTRecordCreate - ( - TXTRecordRef *txtRecord, - uint16_t bufferLen, - void *buffer - ); - - -/* TXTRecordDeallocate() - * - * Releases any resources allocated in the course of preparing a TXT Record - * using TXTRecordCreate()/TXTRecordSetValue()/TXTRecordRemoveValue(). - * Ownership of the buffer provided in TXTRecordCreate() returns to the client. - * - * txtRecord: A TXTRecordRef initialized by calling TXTRecordCreate(). - * - */ - -void DNSSD_API TXTRecordDeallocate - ( - TXTRecordRef *txtRecord - ); - - -/* TXTRecordSetValue() - * - * Adds a key (optionally with value) to a TXTRecordRef. If the "key" already - * exists in the TXTRecordRef, then the current value will be replaced with - * the new value. - * Keys may exist in four states with respect to a given TXT record: - * - Absent (key does not appear at all) - * - Present with no value ("key" appears alone) - * - Present with empty value ("key=" appears in TXT record) - * - Present with non-empty value ("key=value" appears in TXT record) - * For more details refer to "Data Syntax for DNS-SD TXT Records" in - * - * - * txtRecord: A TXTRecordRef initialized by calling TXTRecordCreate(). - * - * key: A null-terminated string which only contains printable ASCII - * values (0x20-0x7E), excluding '=' (0x3D). Keys should be - * 9 characters or fewer (not counting the terminating null). - * - * valueSize: The size of the value. - * - * value: Any binary value. For values that represent - * textual data, UTF-8 is STRONGLY recommended. - * For values that represent textual data, valueSize - * should NOT include the terminating null (if any) - * at the end of the string. - * If NULL, then "key" will be added with no value. - * If non-NULL but valueSize is zero, then "key=" will be - * added with empty value. - * - * return value: Returns kDNSServiceErr_NoError on success. - * Returns kDNSServiceErr_Invalid if the "key" string contains - * illegal characters. - * Returns kDNSServiceErr_NoMemory if adding this key would - * exceed the available storage. - */ - -DNSServiceErrorType DNSSD_API TXTRecordSetValue - ( - TXTRecordRef *txtRecord, - const char *key, - uint8_t valueSize, /* may be zero */ - const void *value /* may be NULL */ - ); - - -/* TXTRecordRemoveValue() - * - * Removes a key from a TXTRecordRef. The "key" must be an - * ASCII string which exists in the TXTRecordRef. - * - * txtRecord: A TXTRecordRef initialized by calling TXTRecordCreate(). - * - * key: A key name which exists in the TXTRecordRef. - * - * return value: Returns kDNSServiceErr_NoError on success. - * Returns kDNSServiceErr_NoSuchKey if the "key" does not - * exist in the TXTRecordRef. - */ - -DNSServiceErrorType DNSSD_API TXTRecordRemoveValue - ( - TXTRecordRef *txtRecord, - const char *key - ); - - -/* TXTRecordGetLength() - * - * Allows you to determine the length of the raw bytes within a TXTRecordRef. - * - * txtRecord: A TXTRecordRef initialized by calling TXTRecordCreate(). - * - * return value: Returns the size of the raw bytes inside a TXTRecordRef - * which you can pass directly to DNSServiceRegister() or - * to DNSServiceUpdateRecord(). - * Returns 0 if the TXTRecordRef is empty. - */ - -uint16_t DNSSD_API TXTRecordGetLength - ( - const TXTRecordRef *txtRecord - ); - - -/* TXTRecordGetBytesPtr() - * - * Allows you to retrieve a pointer to the raw bytes within a TXTRecordRef. - * - * txtRecord: A TXTRecordRef initialized by calling TXTRecordCreate(). - * - * return value: Returns a pointer to the raw bytes inside the TXTRecordRef - * which you can pass directly to DNSServiceRegister() or - * to DNSServiceUpdateRecord(). - */ - -const void * DNSSD_API TXTRecordGetBytesPtr - ( - const TXTRecordRef *txtRecord - ); - - -/********************************************************************************************* - * - * TXT Record Parsing Functions - * - *********************************************************************************************/ - -/* - * A typical calling sequence for TXT record parsing is something like: - * - * Receive TXT record data in DNSServiceResolve() callback - * if (TXTRecordContainsKey(txtLen, txtRecord, "key")) then do something - * val1ptr = TXTRecordGetValuePtr(txtLen, txtRecord, "key1", &len1); - * val2ptr = TXTRecordGetValuePtr(txtLen, txtRecord, "key2", &len2); - * ... - * memcpy(myval1, val1ptr, len1); - * memcpy(myval2, val2ptr, len2); - * ... - * return; - * - * If you wish to retain the values after return from the DNSServiceResolve() - * callback, then you need to copy the data to your own storage using memcpy() - * or similar, as shown in the example above. - * - * If for some reason you need to parse a TXT record you built yourself - * using the TXT record construction functions above, then you can do - * that using TXTRecordGetLength and TXTRecordGetBytesPtr calls: - * TXTRecordGetValue(TXTRecordGetLength(x), TXTRecordGetBytesPtr(x), key, &len); - * - * Most applications only fetch keys they know about from a TXT record and - * ignore the rest. - * However, some debugging tools wish to fetch and display all keys. - * To do that, use the TXTRecordGetCount() and TXTRecordGetItemAtIndex() calls. - */ - -/* TXTRecordContainsKey() - * - * Allows you to determine if a given TXT Record contains a specified key. - * - * txtLen: The size of the received TXT Record. - * - * txtRecord: Pointer to the received TXT Record bytes. - * - * key: A null-terminated ASCII string containing the key name. - * - * return value: Returns 1 if the TXT Record contains the specified key. - * Otherwise, it returns 0. - */ - -int DNSSD_API TXTRecordContainsKey - ( - uint16_t txtLen, - const void *txtRecord, - const char *key - ); - - -/* TXTRecordGetValuePtr() - * - * Allows you to retrieve the value for a given key from a TXT Record. - * - * txtLen: The size of the received TXT Record - * - * txtRecord: Pointer to the received TXT Record bytes. - * - * key: A null-terminated ASCII string containing the key name. - * - * valueLen: On output, will be set to the size of the "value" data. - * - * return value: Returns NULL if the key does not exist in this TXT record, - * or exists with no value (to differentiate between - * these two cases use TXTRecordContainsKey()). - * Returns pointer to location within TXT Record bytes - * if the key exists with empty or non-empty value. - * For empty value, valueLen will be zero. - * For non-empty value, valueLen will be length of value data. - */ - -const void * DNSSD_API TXTRecordGetValuePtr - ( - uint16_t txtLen, - const void *txtRecord, - const char *key, - uint8_t *valueLen - ); - - -/* TXTRecordGetCount() - * - * Returns the number of keys stored in the TXT Record. The count - * can be used with TXTRecordGetItemAtIndex() to iterate through the keys. - * - * txtLen: The size of the received TXT Record. - * - * txtRecord: Pointer to the received TXT Record bytes. - * - * return value: Returns the total number of keys in the TXT Record. - * - */ - -uint16_t DNSSD_API TXTRecordGetCount - ( - uint16_t txtLen, - const void *txtRecord - ); - - -/* TXTRecordGetItemAtIndex() - * - * Allows you to retrieve a key name and value pointer, given an index into - * a TXT Record. Legal index values range from zero to TXTRecordGetCount()-1. - * It's also possible to iterate through keys in a TXT record by simply - * calling TXTRecordGetItemAtIndex() repeatedly, beginning with index zero - * and increasing until TXTRecordGetItemAtIndex() returns kDNSServiceErr_Invalid. - * - * On return: - * For keys with no value, *value is set to NULL and *valueLen is zero. - * For keys with empty value, *value is non-NULL and *valueLen is zero. - * For keys with non-empty value, *value is non-NULL and *valueLen is non-zero. - * - * txtLen: The size of the received TXT Record. - * - * txtRecord: Pointer to the received TXT Record bytes. - * - * itemIndex: An index into the TXT Record. - * - * keyBufLen: The size of the string buffer being supplied. - * - * key: A string buffer used to store the key name. - * On return, the buffer contains a null-terminated C string - * giving the key name. DNS-SD TXT keys are usually - * 9 characters or fewer. To hold the maximum possible - * key name, the buffer should be 256 bytes long. - * - * valueLen: On output, will be set to the size of the "value" data. - * - * value: On output, *value is set to point to location within TXT - * Record bytes that holds the value data. - * - * return value: Returns kDNSServiceErr_NoError on success. - * Returns kDNSServiceErr_NoMemory if keyBufLen is too short. - * Returns kDNSServiceErr_Invalid if index is greater than - * TXTRecordGetCount()-1. - */ - -DNSServiceErrorType DNSSD_API TXTRecordGetItemAtIndex - ( - uint16_t txtLen, - const void *txtRecord, - uint16_t itemIndex, - uint16_t keyBufLen, - char *key, - uint8_t *valueLen, - const void **value - ); - -#if _DNS_SD_LIBDISPATCH -/* -* DNSServiceSetDispatchQueue -* -* Allows you to schedule a DNSServiceRef on a serial dispatch queue for receiving asynchronous -* callbacks. It's the clients responsibility to ensure that the provided dispatch queue is running. -* -* A typical application that uses CFRunLoopRun or dispatch_main on its main thread will -* usually schedule DNSServiceRefs on its main queue (which is always a serial queue) -* using "DNSServiceSetDispatchQueue(sdref, dispatch_get_main_queue());" -* -* If there is any error during the processing of events, the application callback will -* be called with an error code. For shared connections, each subordinate DNSServiceRef -* will get its own error callback. Currently these error callbacks only happen -* if the mDNSResponder daemon is manually terminated or crashes, and the error -* code in this case is kDNSServiceErr_ServiceNotRunning. The application must call -* DNSServiceRefDeallocate to free the DNSServiceRef when it gets such an error code. -* These error callbacks are rare and should not normally happen on customer machines, -* but application code should be written defensively to handle such error callbacks -* gracefully if they occur. -* -* After using DNSServiceSetDispatchQueue on a DNSServiceRef, calling DNSServiceProcessResult -* on the same DNSServiceRef will result in undefined behavior and should be avoided. -* -* Once the application successfully schedules a DNSServiceRef on a serial dispatch queue using -* DNSServiceSetDispatchQueue, it cannot remove the DNSServiceRef from the dispatch queue, or use -* DNSServiceSetDispatchQueue a second time to schedule the DNSServiceRef onto a different serial dispatch -* queue. Once scheduled onto a dispatch queue a DNSServiceRef will deliver events to that queue until -* the application no longer requires that operation and terminates it using DNSServiceRefDeallocate. -* -* service: DNSServiceRef that was allocated and returned to the application, when the -* application calls one of the DNSService API. -* -* queue: dispatch queue where the application callback will be scheduled -* -* return value: Returns kDNSServiceErr_NoError on success. -* Returns kDNSServiceErr_NoMemory if it cannot create a dispatch source -* Returns kDNSServiceErr_BadParam if the service param is invalid or the -* queue param is invalid -*/ - -DNSServiceErrorType DNSSD_API DNSServiceSetDispatchQueue - ( - DNSServiceRef service, - dispatch_queue_t queue - ); -#endif //_DNS_SD_LIBDISPATCH - -#ifdef __APPLE_API_PRIVATE - -#define kDNSServiceCompPrivateDNS "PrivateDNS" -#define kDNSServiceCompMulticastDNS "MulticastDNS" - -#endif //__APPLE_API_PRIVATE - -/* Some C compiler cleverness. We can make the compiler check certain things for us, - * and report errors at compile-time if anything is wrong. The usual way to do this would - * be to use a run-time "if" statement or the conventional run-time "assert" mechanism, but - * then you don't find out what's wrong until you run the software. This way, if the assertion - * condition is false, the array size is negative, and the complier complains immediately. - */ - -struct CompileTimeAssertionChecks_DNS_SD - { - char assert0[(sizeof(union _TXTRecordRef_t) == 16) ? 1 : -1]; - }; - -#ifdef __cplusplus - } -#endif - -#endif /* _DNS_SD_H */ diff --git a/src/tools/mdnssd/dnssd_ipc.c b/src/tools/mdnssd/dnssd_ipc.c deleted file mode 100644 index 131510c80e..0000000000 --- a/src/tools/mdnssd/dnssd_ipc.c +++ /dev/null @@ -1,161 +0,0 @@ -/* -*- Mode: C; tab-width: 4 -*- - * - * Copyright (c) 2003-2004, Apple Computer, Inc. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions are met: - * - * 1. Redistributions of source code must retain the above copyright notice, - * this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright notice, - * this list of conditions and the following disclaimer in the documentation - * and/or other materials provided with the distribution. - * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of its - * contributors may be used to endorse or promote products derived from this - * software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY - * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED - * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE - * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY - * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES - * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; - * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND - * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS - * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ - -#include "dnssd_ipc.h" - -#if defined(_WIN32) - -char *win32_strerror(int inErrorCode) - { - static char buffer[1024]; - DWORD n; - memset(buffer, 0, sizeof(buffer)); - n = FormatMessageA( - FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, - NULL, - (DWORD) inErrorCode, - MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), - buffer, - sizeof(buffer), - NULL); - if (n > 0) - { - // Remove any trailing CR's or LF's since some messages have them. - while ((n > 0) && isspace(((unsigned char *) buffer)[n - 1])) - buffer[--n] = '\0'; - } - return buffer; - } - -#endif - -void put_uint32(const uint32_t l, char **ptr) - { - (*ptr)[0] = (char)((l >> 24) & 0xFF); - (*ptr)[1] = (char)((l >> 16) & 0xFF); - (*ptr)[2] = (char)((l >> 8) & 0xFF); - (*ptr)[3] = (char)((l ) & 0xFF); - *ptr += sizeof(uint32_t); - } - -uint32_t get_uint32(const char **ptr, const char *end) - { - if (!*ptr || *ptr + sizeof(uint32_t) > end) - { - *ptr = NULL; - return(0); - } - else - { - uint8_t *p = (uint8_t*) *ptr; - *ptr += sizeof(uint32_t); - return((uint32_t) ((uint32_t)p[0] << 24 | (uint32_t)p[1] << 16 | (uint32_t)p[2] << 8 | p[3])); - } - } - -void put_uint16(uint16_t s, char **ptr) - { - (*ptr)[0] = (char)((s >> 8) & 0xFF); - (*ptr)[1] = (char)((s ) & 0xFF); - *ptr += sizeof(uint16_t); - } - -uint16_t get_uint16(const char **ptr, const char *end) - { - if (!*ptr || *ptr + sizeof(uint16_t) > end) - { - *ptr = NULL; - return(0); - } - else - { - uint8_t *p = (uint8_t*) *ptr; - *ptr += sizeof(uint16_t); - return((uint16_t) ((uint16_t)p[0] << 8 | p[1])); - } - } - -int put_string(const char *str, char **ptr) - { - if (!str) str = ""; - strcpy(*ptr, str); - *ptr += strlen(str) + 1; - return 0; - } - -int get_string(const char **ptr, const char *const end, char *buffer, int buflen) - { - if (!*ptr) - { - *buffer = 0; - return(-1); - } - else - { - char *lim = buffer + buflen; // Calculate limit - while (*ptr < end && buffer < lim) - { - char c = *buffer++ = *(*ptr)++; - if (c == 0) return(0); // Success - } - if (buffer == lim) buffer--; - *buffer = 0; // Failed, so terminate string, - *ptr = NULL; // clear pointer, - return(-1); // and return failure indication - } - } - -void put_rdata(const int rdlen, const unsigned char *rdata, char **ptr) - { - memcpy(*ptr, rdata, rdlen); - *ptr += rdlen; - } - -const char *get_rdata(const char **ptr, const char *end, int rdlen) - { - if (!*ptr || *ptr + rdlen > end) - { - *ptr = NULL; - return(0); - } - else - { - const char *rd = *ptr; - *ptr += rdlen; - return rd; - } - } - -void ConvertHeaderBytes(ipc_msg_hdr *hdr) - { - hdr->version = htonl(hdr->version); - hdr->datalen = htonl(hdr->datalen); - hdr->ipc_flags = htonl(hdr->ipc_flags); - hdr->op = htonl(hdr->op ); - hdr->reg_index = htonl(hdr->reg_index); - } diff --git a/src/tools/mdnssd/dnssd_ipc.h b/src/tools/mdnssd/dnssd_ipc.h deleted file mode 100644 index 748bbdf213..0000000000 --- a/src/tools/mdnssd/dnssd_ipc.h +++ /dev/null @@ -1,217 +0,0 @@ -/* -*- Mode: C; tab-width: 4 -*- - * - * Copyright (c) 2003-2004, Apple Computer, Inc. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions are met: - * - * 1. Redistributions of source code must retain the above copyright notice, - * this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright notice, - * this list of conditions and the following disclaimer in the documentation - * and/or other materials provided with the distribution. - * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of its - * contributors may be used to endorse or promote products derived from this - * software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY - * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED - * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE - * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY - * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES - * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; - * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND - * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS - * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ - -#ifndef DNSSD_IPC_H -#define DNSSD_IPC_H - -#include "dns_sd.h" - -// -// Common cross platform services -// -#if defined(WIN32) -# include -# define dnssd_InvalidSocket INVALID_SOCKET -# define dnssd_SocketValid(s) ((s) != INVALID_SOCKET) -# define dnssd_EWOULDBLOCK WSAEWOULDBLOCK -# define dnssd_EINTR WSAEINTR -# define dnssd_ECONNRESET WSAECONNRESET -# define dnssd_sock_t SOCKET -# define dnssd_socklen_t int -# define dnssd_close(sock) closesocket(sock) -# define dnssd_errno WSAGetLastError() -# define dnssd_strerror(X) win32_strerror(X) -# define ssize_t int -# define getpid _getpid -# define unlink _unlink -extern char *win32_strerror(int inErrorCode); -#else -# include -# include -# include -# include -# include -# include -# include -# include -# include -# define dnssd_InvalidSocket -1 -# define dnssd_SocketValid(s) ((s) >= 0) -# define dnssd_EWOULDBLOCK EWOULDBLOCK -# define dnssd_EINTR EINTR -# define dnssd_ECONNRESET ECONNRESET -# define dnssd_EPIPE EPIPE -# define dnssd_sock_t int -# define dnssd_socklen_t unsigned int -# define dnssd_close(sock) close(sock) -# define dnssd_errno errno -# define dnssd_strerror(X) strerror(X) -#endif - -#if defined(USE_TCP_LOOPBACK) -# define AF_DNSSD AF_INET -# define MDNS_TCP_SERVERADDR "127.0.0.1" -# define MDNS_TCP_SERVERPORT 5354 -# define LISTENQ 5 -# define dnssd_sockaddr_t struct sockaddr_in -#else -# define AF_DNSSD AF_LOCAL -# ifndef MDNS_UDS_SERVERPATH -# define MDNS_UDS_SERVERPATH "/var/run/mDNSResponder" -# endif -# define LISTENQ 100 - // longest legal control path length -# define MAX_CTLPATH 256 -# define dnssd_sockaddr_t struct sockaddr_un -#endif - -// Compatibility workaround -#ifndef AF_LOCAL -#define AF_LOCAL AF_UNIX -#endif - -// General UDS constants -#define TXT_RECORD_INDEX ((uint32_t)(-1)) // record index for default text record - -// IPC data encoding constants and types -#define VERSION 1 -#define IPC_FLAGS_NOREPLY 1 // set flag if no asynchronous replies are to be sent to client - -// Structure packing macro. If we're not using GNUC, it's not fatal. Most compilers naturally pack the on-the-wire -// structures correctly anyway, so a plain "struct" is usually fine. In the event that structures are not packed -// correctly, our compile-time assertion checks will catch it and prevent inadvertent generation of non-working code. -#ifndef packedstruct - #if ((__GNUC__ > 2) || ((__GNUC__ == 2) && (__GNUC_MINOR__ >= 9))) - #define packedstruct struct __attribute__((__packed__)) - #define packedunion union __attribute__((__packed__)) - #else - #define packedstruct struct - #define packedunion union - #endif -#endif - -typedef enum - { - request_op_none = 0, // No request yet received on this connection - connection_request = 1, // connected socket via DNSServiceConnect() - reg_record_request, // reg/remove record only valid for connected sockets - remove_record_request, - enumeration_request, - reg_service_request, - browse_request, - resolve_request, - query_request, - reconfirm_record_request, - add_record_request, - update_record_request, - setdomain_request, // Up to here is in Tiger and B4W 1.0.3 - getproperty_request, // New in B4W 1.0.4 - port_mapping_request, // New in Leopard and B4W 2.0 - addrinfo_request, - send_bpf, // New in SL - - cancel_request = 63 - } request_op_t; - -typedef enum - { - enumeration_reply_op = 64, - reg_service_reply_op, - browse_reply_op, - resolve_reply_op, - query_reply_op, - reg_record_reply_op, // Up to here is in Tiger and B4W 1.0.3 - getproperty_reply_op, // New in B4W 1.0.4 - port_mapping_reply_op, // New in Leopard and B4W 2.0 - addrinfo_reply_op - } reply_op_t; - -#if defined(_WIN64) -# pragma pack(push,4) -#endif - -// Define context object big enough to hold a 64-bit pointer, -// to accomodate 64-bit clients communicating with 32-bit daemon. -// There's no reason for the daemon to ever be a 64-bit process, but its clients might be -typedef packedunion - { - void *context; - uint32_t u32[2]; - } client_context_t; - -typedef packedstruct - { - uint32_t version; - uint32_t datalen; - uint32_t ipc_flags; - uint32_t op; // request_op_t or reply_op_t - client_context_t client_context; // context passed from client, returned by server in corresponding reply - uint32_t reg_index; // identifier for a record registered via DNSServiceRegisterRecord() on a - // socket connected by DNSServiceCreateConnection(). Must be unique in the scope of the connection, such that and - // index/socket pair uniquely identifies a record. (Used to select records for removal by DNSServiceRemoveRecord()) - } ipc_msg_hdr; - -#if defined(_WIN64) -# pragma pack(pop) -#endif - -// routines to write to and extract data from message buffers. -// caller responsible for bounds checking. -// ptr is the address of the pointer to the start of the field. -// it is advanced to point to the next field, or the end of the message - -void put_uint32(const uint32_t l, char **ptr); -uint32_t get_uint32(const char **ptr, const char *end); - -void put_uint16(uint16_t s, char **ptr); -uint16_t get_uint16(const char **ptr, const char *end); - -#define put_flags put_uint32 -#define get_flags get_uint32 - -#define put_error_code put_uint32 -#define get_error_code get_uint32 - -int put_string(const char *str, char **ptr); -int get_string(const char **ptr, const char *const end, char *buffer, int buflen); - -void put_rdata(const int rdlen, const unsigned char *rdata, char **ptr); -const char *get_rdata(const char **ptr, const char *end, int rdlen); // return value is rdata pointed to by *ptr - - // rdata is not copied from buffer. - -void ConvertHeaderBytes(ipc_msg_hdr *hdr); - -struct CompileTimeAssertionChecks_dnssd_ipc - { - // Check that the compiler generated our on-the-wire packet format structure definitions - // properly packed, without adding padding bytes to align fields on 32-bit or 64-bit boundaries. - char assert0[(sizeof(client_context_t) == 8) ? 1 : -1]; - char assert1[(sizeof(ipc_msg_hdr) == 28) ? 1 : -1]; - }; - -#endif // DNSSD_IPC_H diff --git a/src/tools/mdnssd/mDNS.c b/src/tools/mdnssd/mDNS.c deleted file mode 100644 index 9de7f92c18..0000000000 --- a/src/tools/mdnssd/mDNS.c +++ /dev/null @@ -1,11521 +0,0 @@ -/* -*- Mode: C; tab-width: 4 -*- - * - * Copyright (c) 2002-2006 Apple Computer, Inc. All rights reserved. - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - * - * This code is completely 100% portable C. It does not depend on any external header files - * from outside the mDNS project -- all the types it expects to find are defined right here. - * - * The previous point is very important: This file does not depend on any external - * header files. It should compile on *any* platform that has a C compiler, without - * making *any* assumptions about availability of so-called "standard" C functions, - * routines, or types (which may or may not be present on any given platform). - - * Formatting notes: - * This code follows the "Whitesmiths style" C indentation rules. Plenty of discussion - * on C indentation can be found on the web, such as , - * but for the sake of brevity here I will say just this: Curly braces are not syntactially - * part of an "if" statement; they are the beginning and ending markers of a compound statement; - * therefore common sense dictates that if they are part of a compound statement then they - * should be indented to the same level as everything else in that compound statement. - * Indenting curly braces at the same level as the "if" implies that curly braces are - * part of the "if", which is false. (This is as misleading as people who write "char* x,y;" - * thinking that variables x and y are both of type "char*" -- and anyone who doesn't - * understand why variable y is not of type "char*" just proves the point that poor code - * layout leads people to unfortunate misunderstandings about how the C language really works.) - */ - -#include "DNSCommon.h" // Defines general DNS untility routines -#include "uDNS.h" // Defines entry points into unicast-specific routines - -// Disable certain benign warnings with Microsoft compilers -#if(defined(_MSC_VER)) - // Disable "conditional expression is constant" warning for debug macros. - // Otherwise, this generates warnings for the perfectly natural construct "while(1)" - // If someone knows a variant way of writing "while(1)" that doesn't generate warning messages, please let us know - #pragma warning(disable:4127) - - // Disable "assignment within conditional expression". - // Other compilers understand the convention that if you place the assignment expression within an extra pair - // of parentheses, this signals to the compiler that you really intended an assignment and no warning is necessary. - // The Microsoft compiler doesn't understand this convention, so in the absense of any other way to signal - // to the compiler that the assignment is intentional, we have to just turn this warning off completely. - #pragma warning(disable:4706) -#endif - -#if APPLE_OSX_mDNSResponder - -#include - -#if ! NO_WCF -WCFConnection *WCFConnectionNew(void) __attribute__((weak_import)); -void WCFConnectionDealloc(WCFConnection* c) __attribute__((weak_import)); - -// Do we really need to define a macro for "if"? -#define CHECK_WCF_FUNCTION(X) if (X) -#endif // ! NO_WCF - -#else - -#define NO_WCF 1 -#endif // APPLE_OSX_mDNSResponder - -// Forward declarations -mDNSlocal void BeginSleepProcessing(mDNS *const m); -mDNSlocal void RetrySPSRegistrations(mDNS *const m); -mDNSlocal void SendWakeup(mDNS *const m, mDNSInterfaceID InterfaceID, mDNSEthAddr *EthAddr, mDNSOpaque48 *password); -mDNSlocal mDNSBool CacheRecordRmvEventsForQuestion(mDNS *const m, DNSQuestion *q); -mDNSlocal mDNSBool LocalRecordRmvEventsForQuestion(mDNS *const m, DNSQuestion *q); -mDNSlocal void mDNS_PurgeBeforeResolve(mDNS *const m, DNSQuestion *q); - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - Program Constants -#endif - -#define NO_HINFO 1 - - -// Any records bigger than this are considered 'large' records -#define SmallRecordLimit 1024 - -#define kMaxUpdateCredits 10 -#define kUpdateCreditRefreshInterval (mDNSPlatformOneSecond * 6) - -mDNSexport const char *const mDNS_DomainTypeNames[] = - { - "b._dns-sd._udp.", // Browse - "db._dns-sd._udp.", // Default Browse - "lb._dns-sd._udp.", // Automatic Browse - "r._dns-sd._udp.", // Registration - "dr._dns-sd._udp." // Default Registration - }; - -#ifdef UNICAST_DISABLED -#define uDNS_IsActiveQuery(q, u) mDNSfalse -#endif - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - General Utility Functions -#endif - -// If there is a authoritative LocalOnly record that answers questions of type A, AAAA and CNAME -// this returns true. Main use is to handle /etc/hosts records. -#define LORecordAnswersAddressType(rr) ((rr)->ARType == AuthRecordLocalOnly && \ - (rr)->resrec.RecordType & kDNSRecordTypeUniqueMask && \ - ((rr)->resrec.rrtype == kDNSType_A || (rr)->resrec.rrtype == kDNSType_AAAA || \ - (rr)->resrec.rrtype == kDNSType_CNAME)) - -#define FollowCNAME(q, rr, AddRecord) (AddRecord && (q)->qtype != kDNSType_CNAME && \ - (rr)->RecordType != kDNSRecordTypePacketNegative && \ - (rr)->rrtype == kDNSType_CNAME) - -mDNSlocal void SetNextQueryStopTime(mDNS *const m, const DNSQuestion *const q) - { - if (m->mDNS_busy != m->mDNS_reentrancy+1) - LogMsg("SetNextQueryTime: Lock not held! mDNS_busy (%ld) mDNS_reentrancy (%ld)", m->mDNS_busy, m->mDNS_reentrancy); - -#if ForceAlerts - if (m->mDNS_busy != m->mDNS_reentrancy+1) *(long*)0 = 0; -#endif - - if (m->NextScheduledStopTime - q->StopTime > 0) - m->NextScheduledStopTime = q->StopTime; - } - -mDNSexport void SetNextQueryTime(mDNS *const m, const DNSQuestion *const q) - { - if (m->mDNS_busy != m->mDNS_reentrancy+1) - LogMsg("SetNextQueryTime: Lock not held! mDNS_busy (%ld) mDNS_reentrancy (%ld)", m->mDNS_busy, m->mDNS_reentrancy); - -#if ForceAlerts - if (m->mDNS_busy != m->mDNS_reentrancy+1) *(long*)0 = 0; -#endif - - if (ActiveQuestion(q)) - { - // Depending on whether this is a multicast or unicast question we want to set either: - // m->NextScheduledQuery = NextQSendTime(q) or - // m->NextuDNSEvent = NextQSendTime(q) - mDNSs32 *const timer = mDNSOpaque16IsZero(q->TargetQID) ? &m->NextScheduledQuery : &m->NextuDNSEvent; - if (*timer - NextQSendTime(q) > 0) - *timer = NextQSendTime(q); - } - } - -mDNSlocal void ReleaseAuthEntity(AuthHash *r, AuthEntity *e) - { -#if APPLE_OSX_mDNSResponder && MACOSX_MDNS_MALLOC_DEBUGGING >= 1 - unsigned int i; - for (i=0; inext = r->rrauth_free; - r->rrauth_free = e; - r->rrauth_totalused--; - } - -mDNSlocal void ReleaseAuthGroup(AuthHash *r, AuthGroup **cp) - { - AuthEntity *e = (AuthEntity *)(*cp); - LogMsg("ReleaseAuthGroup: Releasing AuthGroup %##s", (*cp)->name->c); - if ((*cp)->rrauth_tail != &(*cp)->members) - LogMsg("ERROR: (*cp)->members == mDNSNULL but (*cp)->rrauth_tail != &(*cp)->members)"); - if ((*cp)->name != (domainname*)((*cp)->namestorage)) mDNSPlatformMemFree((*cp)->name); - (*cp)->name = mDNSNULL; - *cp = (*cp)->next; // Cut record from list - ReleaseAuthEntity(r, e); - } - -mDNSlocal AuthEntity *GetAuthEntity(AuthHash *r, const AuthGroup *const PreserveAG) - { - AuthEntity *e = mDNSNULL; - - if (r->rrauth_lock) { LogMsg("GetFreeCacheRR ERROR! Cache already locked!"); return(mDNSNULL); } - r->rrauth_lock = 1; - - if (!r->rrauth_free) - { - // We allocate just one AuthEntity at a time because we need to be able - // free them all individually which normally happens when we parse /etc/hosts into - // AuthHash where we add the "new" entries and discard (free) the already added - // entries. If we allocate as chunks, we can't free them individually. - AuthEntity *storage = mDNSPlatformMemAllocate(sizeof(AuthEntity)); - storage->next = mDNSNULL; - r->rrauth_free = storage; - } - - // If we still have no free records, recycle all the records we can. - // Enumerating the entire auth is moderately expensive, so when we do it, we reclaim all the records we can in one pass. - if (!r->rrauth_free) - { - mDNSu32 oldtotalused = r->rrauth_totalused; - mDNSu32 slot; - for (slot = 0; slot < AUTH_HASH_SLOTS; slot++) - { - AuthGroup **cp = &r->rrauth_hash[slot]; - while (*cp) - { - if ((*cp)->members || (*cp)==PreserveAG) cp=&(*cp)->next; - else ReleaseAuthGroup(r, cp); - } - } - LogInfo("GetAuthEntity: Recycled %d records to reduce auth cache from %d to %d", - oldtotalused - r->rrauth_totalused, oldtotalused, r->rrauth_totalused); - } - - if (r->rrauth_free) // If there are records in the free list, take one - { - e = r->rrauth_free; - r->rrauth_free = e->next; - if (++r->rrauth_totalused >= r->rrauth_report) - { - LogInfo("RR Auth now using %ld objects", r->rrauth_totalused); - if (r->rrauth_report < 100) r->rrauth_report += 10; - else if (r->rrauth_report < 1000) r->rrauth_report += 100; - else r->rrauth_report += 1000; - } - mDNSPlatformMemZero(e, sizeof(*e)); - } - - r->rrauth_lock = 0; - - return(e); - } - -mDNSexport AuthGroup *AuthGroupForName(AuthHash *r, const mDNSu32 slot, const mDNSu32 namehash, const domainname *const name) - { - AuthGroup *ag; - for (ag = r->rrauth_hash[slot]; ag; ag=ag->next) - if (ag->namehash == namehash && SameDomainName(ag->name, name)) - break; - return(ag); - } - -mDNSexport AuthGroup *AuthGroupForRecord(AuthHash *r, const mDNSu32 slot, const ResourceRecord *const rr) - { - return(AuthGroupForName(r, slot, rr->namehash, rr->name)); - } - -mDNSlocal AuthGroup *GetAuthGroup(AuthHash *r, const mDNSu32 slot, const ResourceRecord *const rr) - { - mDNSu16 namelen = DomainNameLength(rr->name); - AuthGroup *ag = (AuthGroup*)GetAuthEntity(r, mDNSNULL); - if (!ag) { LogMsg("GetAuthGroup: Failed to allocate memory for %##s", rr->name->c); return(mDNSNULL); } - ag->next = r->rrauth_hash[slot]; - ag->namehash = rr->namehash; - ag->members = mDNSNULL; - ag->rrauth_tail = &ag->members; - ag->name = (domainname*)ag->namestorage; - ag->NewLocalOnlyRecords = mDNSNULL; - if (namelen > InlineCacheGroupNameSize) ag->name = mDNSPlatformMemAllocate(namelen); - if (!ag->name) - { - LogMsg("GetAuthGroup: Failed to allocate name storage for %##s", rr->name->c); - ReleaseAuthEntity(r, (AuthEntity*)ag); - return(mDNSNULL); - } - AssignDomainName(ag->name, rr->name); - - if (AuthGroupForRecord(r, slot, rr)) LogMsg("GetAuthGroup: Already have AuthGroup for %##s", rr->name->c); - r->rrauth_hash[slot] = ag; - if (AuthGroupForRecord(r, slot, rr) != ag) LogMsg("GetAuthGroup: Not finding AuthGroup for %##s", rr->name->c); - - return(ag); - } - -// Returns the AuthGroup in which the AuthRecord was inserted -mDNSexport AuthGroup *InsertAuthRecord(mDNS *const m, AuthHash *r, AuthRecord *rr) - { - AuthGroup *ag; - const mDNSu32 slot = AuthHashSlot(rr->resrec.name); - ag = AuthGroupForRecord(r, slot, &rr->resrec); - if (!ag) ag = GetAuthGroup(r, slot, &rr->resrec); // If we don't have a AuthGroup for this name, make one now - if (ag) - { - LogInfo("InsertAuthRecord: inserting auth record %s from table", ARDisplayString(m, rr)); - *(ag->rrauth_tail) = rr; // Append this record to tail of cache slot list - ag->rrauth_tail = &(rr->next); // Advance tail pointer - } - return ag; - } - -mDNSexport AuthGroup *RemoveAuthRecord(mDNS *const m, AuthHash *r, AuthRecord *rr) - { - AuthGroup *a; - AuthGroup **ag = &a; - AuthRecord **rp; - const mDNSu32 slot = AuthHashSlot(rr->resrec.name); - - a = AuthGroupForRecord(r, slot, &rr->resrec); - if (!a) { LogMsg("RemoveAuthRecord: ERROR!! AuthGroup not found for %s", ARDisplayString(m, rr)); return mDNSNULL; } - rp = &(*ag)->members; - while (*rp) - { - if (*rp != rr) - rp=&(*rp)->next; - else - { - // We don't break here, so that we can set the tail below without tracking "prev" pointers - - LogInfo("RemoveAuthRecord: removing auth record %s from table", ARDisplayString(m, rr)); - *rp = (*rp)->next; // Cut record from list - } - } - // TBD: If there are no more members, release authgroup ? - (*ag)->rrauth_tail = rp; - return a; - } - -mDNSexport CacheGroup *CacheGroupForName(const mDNS *const m, const mDNSu32 slot, const mDNSu32 namehash, const domainname *const name) - { - CacheGroup *cg; - for (cg = m->rrcache_hash[slot]; cg; cg=cg->next) - if (cg->namehash == namehash && SameDomainName(cg->name, name)) - break; - return(cg); - } - -mDNSlocal CacheGroup *CacheGroupForRecord(const mDNS *const m, const mDNSu32 slot, const ResourceRecord *const rr) - { - return(CacheGroupForName(m, slot, rr->namehash, rr->name)); - } - -mDNSexport mDNSBool mDNS_AddressIsLocalSubnet(mDNS *const m, const mDNSInterfaceID InterfaceID, const mDNSAddr *addr) - { - NetworkInterfaceInfo *intf; - - if (addr->type == mDNSAddrType_IPv4) - { - // Normally we resist touching the NotAnInteger fields, but here we're doing tricky bitwise masking so we make an exception - if (mDNSv4AddressIsLinkLocal(&addr->ip.v4)) return(mDNStrue); - for (intf = m->HostInterfaces; intf; intf = intf->next) - if (intf->ip.type == addr->type && intf->InterfaceID == InterfaceID && intf->McastTxRx) - if (((intf->ip.ip.v4.NotAnInteger ^ addr->ip.v4.NotAnInteger) & intf->mask.ip.v4.NotAnInteger) == 0) - return(mDNStrue); - } - - if (addr->type == mDNSAddrType_IPv6) - { - if (mDNSv6AddressIsLinkLocal(&addr->ip.v6)) return(mDNStrue); - for (intf = m->HostInterfaces; intf; intf = intf->next) - if (intf->ip.type == addr->type && intf->InterfaceID == InterfaceID && intf->McastTxRx) - if ((((intf->ip.ip.v6.l[0] ^ addr->ip.v6.l[0]) & intf->mask.ip.v6.l[0]) == 0) && - (((intf->ip.ip.v6.l[1] ^ addr->ip.v6.l[1]) & intf->mask.ip.v6.l[1]) == 0) && - (((intf->ip.ip.v6.l[2] ^ addr->ip.v6.l[2]) & intf->mask.ip.v6.l[2]) == 0) && - (((intf->ip.ip.v6.l[3] ^ addr->ip.v6.l[3]) & intf->mask.ip.v6.l[3]) == 0)) - return(mDNStrue); - } - - return(mDNSfalse); - } - -mDNSlocal NetworkInterfaceInfo *FirstInterfaceForID(mDNS *const m, const mDNSInterfaceID InterfaceID) - { - NetworkInterfaceInfo *intf = m->HostInterfaces; - while (intf && intf->InterfaceID != InterfaceID) intf = intf->next; - return(intf); - } - -mDNSexport char *InterfaceNameForID(mDNS *const m, const mDNSInterfaceID InterfaceID) - { - NetworkInterfaceInfo *intf = FirstInterfaceForID(m, InterfaceID); - return(intf ? intf->ifname : mDNSNULL); - } - -// Caller should hold the lock -mDNSlocal void GenerateNegativeResponse(mDNS *const m) - { - DNSQuestion *q; - if (!m->CurrentQuestion) { LogMsg("GenerateNegativeResponse: ERROR!! CurrentQuestion not set"); return; } - q = m->CurrentQuestion; - LogInfo("GenerateNegativeResponse: Generating negative response for question %##s (%s)", q->qname.c, DNSTypeName(q->qtype)); - - MakeNegativeCacheRecord(m, &m->rec.r, &q->qname, q->qnamehash, q->qtype, q->qclass, 60, mDNSInterface_Any, mDNSNULL); - AnswerCurrentQuestionWithResourceRecord(m, &m->rec.r, QC_addnocache); - if (m->CurrentQuestion == q) { q->ThisQInterval = 0; } // Deactivate this question - // Don't touch the question after this - m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it - } - -mDNSlocal void AnswerQuestionByFollowingCNAME(mDNS *const m, DNSQuestion *q, ResourceRecord *rr) - { - const mDNSBool selfref = SameDomainName(&q->qname, &rr->rdata->u.name); - if (q->CNAMEReferrals >= 10 || selfref) - LogMsg("AnswerQuestionByFollowingCNAME: %p %##s (%s) NOT following CNAME referral %d%s for %s", - q, q->qname.c, DNSTypeName(q->qtype), q->CNAMEReferrals, selfref ? " (Self-Referential)" : "", RRDisplayString(m, rr)); - else - { - const mDNSu32 c = q->CNAMEReferrals + 1; // Stash a copy of the new q->CNAMEReferrals value - - // The SameDomainName check above is to ignore bogus CNAME records that point right back at - // themselves. Without that check we can get into a case where we have two duplicate questions, - // A and B, and when we stop question A, UpdateQuestionDuplicates copies the value of CNAMEReferrals - // from A to B, and then A is re-appended to the end of the list as a duplicate of B (because - // the target name is still the same), and then when we stop question B, UpdateQuestionDuplicates - // copies the B's value of CNAMEReferrals back to A, and we end up not incrementing CNAMEReferrals - // for either of them. This is not a problem for CNAME loops of two or more records because in - // those cases the newly re-appended question A has a different target name and therefore cannot be - // a duplicate of any other question ('B') which was itself a duplicate of the previous question A. - - // Right now we just stop and re-use the existing query. If we really wanted to be 100% perfect, - // and track CNAMEs coming and going, we should really create a subordinate query here, - // which we would subsequently cancel and retract if the CNAME referral record were removed. - // In reality this is such a corner case we'll ignore it until someone actually needs it. - - LogInfo("AnswerQuestionByFollowingCNAME: %p %##s (%s) following CNAME referral %d for %s", - q, q->qname.c, DNSTypeName(q->qtype), q->CNAMEReferrals, RRDisplayString(m, rr)); - - mDNS_StopQuery_internal(m, q); // Stop old query - AssignDomainName(&q->qname, &rr->rdata->u.name); // Update qname - q->qnamehash = DomainNameHashValue(&q->qname); // and namehash - // If a unicast query results in a CNAME that points to a .local, we need to re-try - // this as unicast. Setting the mDNSInterface_Unicast tells mDNS_StartQuery_internal - // to try this as unicast query even though it is a .local name - if (!mDNSOpaque16IsZero(q->TargetQID) && IsLocalDomain(&q->qname)) - { - LogInfo("AnswerQuestionByFollowingCNAME: Resolving a .local CNAME %p %##s (%s) Record %s", - q, q->qname.c, DNSTypeName(q->qtype), RRDisplayString(m, rr)); - q->InterfaceID = mDNSInterface_Unicast; - } - mDNS_StartQuery_internal(m, q); // start new query - // Record how many times we've done this. We need to do this *after* mDNS_StartQuery_internal, - // because mDNS_StartQuery_internal re-initializes CNAMEReferrals to zero - q->CNAMEReferrals = c; - } - } - -// For a single given DNSQuestion pointed to by CurrentQuestion, deliver an add/remove result for the single given AuthRecord -// Note: All the callers should use the m->CurrentQuestion to see if the question is still valid or not -mDNSlocal void AnswerLocalQuestionWithLocalAuthRecord(mDNS *const m, AuthRecord *rr, QC_result AddRecord) - { - DNSQuestion *q = m->CurrentQuestion; - mDNSBool followcname; - - if (!q) - { - LogMsg("AnswerLocalQuestionWithLocalAuthRecord: ERROR!! CurrentQuestion NULL while answering with %s", ARDisplayString(m, rr)); - return; - } - - followcname = FollowCNAME(q, &rr->resrec, AddRecord); - - // We should not be delivering results for record types Unregistered, Deregistering, and (unverified) Unique - if (!(rr->resrec.RecordType & kDNSRecordTypeActiveMask)) - { - LogMsg("AnswerLocalQuestionWithLocalAuthRecord: *NOT* delivering %s event for local record type %X %s", - AddRecord ? "Add" : "Rmv", rr->resrec.RecordType, ARDisplayString(m, rr)); - return; - } - - // Indicate that we've given at least one positive answer for this record, so we should be prepared to send a goodbye for it - if (AddRecord) rr->AnsweredLocalQ = mDNStrue; - mDNS_DropLockBeforeCallback(); // Allow client to legally make mDNS API calls from the callback - if (q->QuestionCallback && !q->NoAnswer) - { - q->CurrentAnswers += AddRecord ? 1 : -1; - if (LORecordAnswersAddressType(rr)) - { - if (!followcname || q->ReturnIntermed) - { - // Don't send this packet on the wire as we answered from /etc/hosts - q->ThisQInterval = 0; - q->LOAddressAnswers += AddRecord ? 1 : -1; - q->QuestionCallback(m, q, &rr->resrec, AddRecord); - } - mDNS_ReclaimLockAfterCallback(); // Decrement mDNS_reentrancy to block mDNS API calls again - // The callback above could have caused the question to stop. Detect that - // using m->CurrentQuestion - if (followcname && m->CurrentQuestion == q) - AnswerQuestionByFollowingCNAME(m, q, &rr->resrec); - return; - } - else - q->QuestionCallback(m, q, &rr->resrec, AddRecord); - } - mDNS_ReclaimLockAfterCallback(); // Decrement mDNS_reentrancy to block mDNS API calls again - } - -mDNSlocal void AnswerInterfaceAnyQuestionsWithLocalAuthRecord(mDNS *const m, AuthRecord *rr, QC_result AddRecord) - { - if (m->CurrentQuestion) - LogMsg("AnswerInterfaceAnyQuestionsWithLocalAuthRecord: ERROR m->CurrentQuestion already set: %##s (%s)", - m->CurrentQuestion->qname.c, DNSTypeName(m->CurrentQuestion->qtype)); - m->CurrentQuestion = m->Questions; - while (m->CurrentQuestion && m->CurrentQuestion != m->NewQuestions) - { - mDNSBool answered; - DNSQuestion *q = m->CurrentQuestion; - if (RRAny(rr)) - answered = ResourceRecordAnswersQuestion(&rr->resrec, q); - else - answered = LocalOnlyRecordAnswersQuestion(rr, q); - if (answered) - AnswerLocalQuestionWithLocalAuthRecord(m, rr, AddRecord); // MUST NOT dereference q again - if (m->CurrentQuestion == q) // If m->CurrentQuestion was not auto-advanced, do it ourselves now - m->CurrentQuestion = q->next; - } - m->CurrentQuestion = mDNSNULL; - } - -// When a new local AuthRecord is created or deleted, AnswerAllLocalQuestionsWithLocalAuthRecord() -// delivers the appropriate add/remove events to listening questions: -// 1. It runs though all our LocalOnlyQuestions delivering answers as appropriate, -// stopping if it reaches a NewLocalOnlyQuestion -- brand-new questions are handled by AnswerNewLocalOnlyQuestion(). -// 2. If the AuthRecord is marked mDNSInterface_LocalOnly or mDNSInterface_P2P, then it also runs though -// our main question list, delivering answers to mDNSInterface_Any questions as appropriate, -// stopping if it reaches a NewQuestion -- brand-new questions are handled by AnswerNewQuestion(). -// -// AnswerAllLocalQuestionsWithLocalAuthRecord is used by the m->NewLocalRecords loop in mDNS_Execute(), -// and by mDNS_Deregister_internal() - -mDNSlocal void AnswerAllLocalQuestionsWithLocalAuthRecord(mDNS *const m, AuthRecord *rr, QC_result AddRecord) - { - if (m->CurrentQuestion) - LogMsg("AnswerAllLocalQuestionsWithLocalAuthRecord ERROR m->CurrentQuestion already set: %##s (%s)", - m->CurrentQuestion->qname.c, DNSTypeName(m->CurrentQuestion->qtype)); - - m->CurrentQuestion = m->LocalOnlyQuestions; - while (m->CurrentQuestion && m->CurrentQuestion != m->NewLocalOnlyQuestions) - { - mDNSBool answered; - DNSQuestion *q = m->CurrentQuestion; - // We are called with both LocalOnly/P2P record or a regular AuthRecord - if (RRAny(rr)) - answered = ResourceRecordAnswersQuestion(&rr->resrec, q); - else - answered = LocalOnlyRecordAnswersQuestion(rr, q); - if (answered) - AnswerLocalQuestionWithLocalAuthRecord(m, rr, AddRecord); // MUST NOT dereference q again - if (m->CurrentQuestion == q) // If m->CurrentQuestion was not auto-advanced, do it ourselves now - m->CurrentQuestion = q->next; - } - - m->CurrentQuestion = mDNSNULL; - - // If this AuthRecord is marked LocalOnly or P2P, then we want to deliver it to all local 'mDNSInterface_Any' questions - if (rr->ARType == AuthRecordLocalOnly || rr->ARType == AuthRecordP2P) - AnswerInterfaceAnyQuestionsWithLocalAuthRecord(m, rr, AddRecord); - - } - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - Resource Record Utility Functions -#endif - -#define RRTypeIsAddressType(T) ((T) == kDNSType_A || (T) == kDNSType_AAAA) - -#define ResourceRecordIsValidAnswer(RR) ( ((RR)-> resrec.RecordType & kDNSRecordTypeActiveMask) && \ - ((RR)->Additional1 == mDNSNULL || ((RR)->Additional1->resrec.RecordType & kDNSRecordTypeActiveMask)) && \ - ((RR)->Additional2 == mDNSNULL || ((RR)->Additional2->resrec.RecordType & kDNSRecordTypeActiveMask)) && \ - ((RR)->DependentOn == mDNSNULL || ((RR)->DependentOn->resrec.RecordType & kDNSRecordTypeActiveMask)) ) - -#define ResourceRecordIsValidInterfaceAnswer(RR, INTID) \ - (ResourceRecordIsValidAnswer(RR) && \ - ((RR)->resrec.InterfaceID == mDNSInterface_Any || (RR)->resrec.InterfaceID == (INTID))) - -#define DefaultProbeCountForTypeUnique ((mDNSu8)3) -#define DefaultProbeCountForRecordType(X) ((X) == kDNSRecordTypeUnique ? DefaultProbeCountForTypeUnique : (mDNSu8)0) - -#define InitialAnnounceCount ((mDNSu8)8) - -// For goodbye packets we set the count to 3, and for wakeups we set it to 18 -// (which will be up to 15 wakeup attempts over the course of 30 seconds, -// and then if the machine fails to wake, 3 goodbye packets). -#define GoodbyeCount ((mDNSu8)3) -#define WakeupCount ((mDNSu8)18) - -// Number of wakeups we send if WakeOnResolve is set in the question -#define InitialWakeOnResolveCount ((mDNSu8)3) - -// Note that the announce intervals use exponential backoff, doubling each time. The probe intervals do not. -// This means that because the announce interval is doubled after sending the first packet, the first -// observed on-the-wire inter-packet interval between announcements is actually one second. -// The half-second value here may be thought of as a conceptual (non-existent) half-second delay *before* the first packet is sent. -#define DefaultProbeIntervalForTypeUnique (mDNSPlatformOneSecond/4) -#define DefaultAnnounceIntervalForTypeShared (mDNSPlatformOneSecond/2) -#define DefaultAnnounceIntervalForTypeUnique (mDNSPlatformOneSecond/2) - -#define DefaultAPIntervalForRecordType(X) ((X) & kDNSRecordTypeActiveSharedMask ? DefaultAnnounceIntervalForTypeShared : \ - (X) & kDNSRecordTypeUnique ? DefaultProbeIntervalForTypeUnique : \ - (X) & kDNSRecordTypeActiveUniqueMask ? DefaultAnnounceIntervalForTypeUnique : 0) - -#define TimeToAnnounceThisRecord(RR,time) ((RR)->AnnounceCount && (time) - ((RR)->LastAPTime + (RR)->ThisAPInterval) >= 0) -#define TimeToSendThisRecord(RR,time) ((TimeToAnnounceThisRecord(RR,time) || (RR)->ImmedAnswer) && ResourceRecordIsValidAnswer(RR)) -#define TicksTTL(RR) ((mDNSs32)(RR)->resrec.rroriginalttl * mDNSPlatformOneSecond) -#define RRExpireTime(RR) ((RR)->TimeRcvd + TicksTTL(RR)) - -#define MaxUnansweredQueries 4 - -// SameResourceRecordSignature returns true if two resources records have the same name, type, and class, and may be sent -// (or were received) on the same interface (i.e. if *both* records specify an interface, then it has to match). -// TTL and rdata may differ. -// This is used for cache flush management: -// When sending a unique record, all other records matching "SameResourceRecordSignature" must also be sent -// When receiving a unique record, all old cache records matching "SameResourceRecordSignature" are flushed - -// SameResourceRecordNameClassInterface is functionally the same as SameResourceRecordSignature, except rrtype does not have to match - -#define SameResourceRecordSignature(A,B) (A)->resrec.rrtype == (B)->resrec.rrtype && SameResourceRecordNameClassInterface((A),(B)) - -mDNSlocal mDNSBool SameResourceRecordNameClassInterface(const AuthRecord *const r1, const AuthRecord *const r2) - { - if (!r1) { LogMsg("SameResourceRecordSignature ERROR: r1 is NULL"); return(mDNSfalse); } - if (!r2) { LogMsg("SameResourceRecordSignature ERROR: r2 is NULL"); return(mDNSfalse); } - if (r1->resrec.InterfaceID && - r2->resrec.InterfaceID && - r1->resrec.InterfaceID != r2->resrec.InterfaceID) return(mDNSfalse); - return(mDNSBool)( - r1->resrec.rrclass == r2->resrec.rrclass && - r1->resrec.namehash == r2->resrec.namehash && - SameDomainName(r1->resrec.name, r2->resrec.name)); - } - -// PacketRRMatchesSignature behaves as SameResourceRecordSignature, except that types may differ if our -// authoratative record is unique (as opposed to shared). For unique records, we are supposed to have -// complete ownership of *all* types for this name, so *any* record type with the same name is a conflict. -// In addition, when probing we send our questions with the wildcard type kDNSQType_ANY, -// so a response of any type should match, even if it is not actually the type the client plans to use. - -// For now, to make it easier to avoid false conflicts, we treat SPS Proxy records like shared records, -// and require the rrtypes to match for the rdata to be considered potentially conflicting -mDNSlocal mDNSBool PacketRRMatchesSignature(const CacheRecord *const pktrr, const AuthRecord *const authrr) - { - if (!pktrr) { LogMsg("PacketRRMatchesSignature ERROR: pktrr is NULL"); return(mDNSfalse); } - if (!authrr) { LogMsg("PacketRRMatchesSignature ERROR: authrr is NULL"); return(mDNSfalse); } - if (pktrr->resrec.InterfaceID && - authrr->resrec.InterfaceID && - pktrr->resrec.InterfaceID != authrr->resrec.InterfaceID) return(mDNSfalse); - if (!(authrr->resrec.RecordType & kDNSRecordTypeUniqueMask) || authrr->WakeUp.HMAC.l[0]) - if (pktrr->resrec.rrtype != authrr->resrec.rrtype) return(mDNSfalse); - return(mDNSBool)( - pktrr->resrec.rrclass == authrr->resrec.rrclass && - pktrr->resrec.namehash == authrr->resrec.namehash && - SameDomainName(pktrr->resrec.name, authrr->resrec.name)); - } - -// CacheRecord *ka is the CacheRecord from the known answer list in the query. -// This is the information that the requester believes to be correct. -// AuthRecord *rr is the answer we are proposing to give, if not suppressed. -// This is the information that we believe to be correct. -// We've already determined that we plan to give this answer on this interface -// (either the record is non-specific, or it is specific to this interface) -// so now we just need to check the name, type, class, rdata and TTL. -mDNSlocal mDNSBool ShouldSuppressKnownAnswer(const CacheRecord *const ka, const AuthRecord *const rr) - { - // If RR signature is different, or data is different, then don't suppress our answer - if (!IdenticalResourceRecord(&ka->resrec, &rr->resrec)) return(mDNSfalse); - - // If the requester's indicated TTL is less than half the real TTL, - // we need to give our answer before the requester's copy expires. - // If the requester's indicated TTL is at least half the real TTL, - // then we can suppress our answer this time. - // If the requester's indicated TTL is greater than the TTL we believe, - // then that's okay, and we don't need to do anything about it. - // (If two responders on the network are offering the same information, - // that's okay, and if they are offering the information with different TTLs, - // the one offering the lower TTL should defer to the one offering the higher TTL.) - return(mDNSBool)(ka->resrec.rroriginalttl >= rr->resrec.rroriginalttl / 2); - } - -mDNSlocal void SetNextAnnounceProbeTime(mDNS *const m, const AuthRecord *const rr) - { - if (rr->resrec.RecordType == kDNSRecordTypeUnique) - { - if ((rr->LastAPTime + rr->ThisAPInterval) - m->timenow > mDNSPlatformOneSecond * 10) - { - LogMsg("SetNextAnnounceProbeTime: ProbeCount %d Next in %d %s", rr->ProbeCount, (rr->LastAPTime + rr->ThisAPInterval) - m->timenow, ARDisplayString(m, rr)); - LogMsg("SetNextAnnounceProbeTime: m->SuppressProbes %d m->timenow %d diff %d", m->SuppressProbes, m->timenow, m->SuppressProbes - m->timenow); - } - if (m->NextScheduledProbe - (rr->LastAPTime + rr->ThisAPInterval) >= 0) - m->NextScheduledProbe = (rr->LastAPTime + rr->ThisAPInterval); - // Some defensive code: - // If (rr->LastAPTime + rr->ThisAPInterval) happens to be far in the past, we don't want to allow - // NextScheduledProbe to be set excessively in the past, because that can cause bad things to happen. - // See: mDNS: Sometimes advertising stops working and record interval is set to zero - if (m->NextScheduledProbe - m->timenow < 0) - m->NextScheduledProbe = m->timenow; - } - else if (rr->AnnounceCount && (ResourceRecordIsValidAnswer(rr) || rr->resrec.RecordType == kDNSRecordTypeDeregistering)) - { - if (m->NextScheduledResponse - (rr->LastAPTime + rr->ThisAPInterval) >= 0) - m->NextScheduledResponse = (rr->LastAPTime + rr->ThisAPInterval); - } - } - -mDNSlocal void InitializeLastAPTime(mDNS *const m, AuthRecord *const rr) - { - // For reverse-mapping Sleep Proxy PTR records, probe interval is one second - rr->ThisAPInterval = rr->AddressProxy.type ? mDNSPlatformOneSecond : DefaultAPIntervalForRecordType(rr->resrec.RecordType); - - // * If this is a record type that's going to probe, then we use the m->SuppressProbes time. - // * Otherwise, if it's not going to probe, but m->SuppressProbes is set because we have other - // records that are going to probe, then we delay its first announcement so that it will - // go out synchronized with the first announcement for the other records that *are* probing. - // This is a minor performance tweak that helps keep groups of related records synchronized together. - // The addition of "interval / 2" is to make sure that, in the event that any of the probes are - // delayed by a few milliseconds, this announcement does not inadvertently go out *before* the probing is complete. - // When the probing is complete and those records begin to announce, these records will also be picked up and accelerated, - // because they will meet the criterion of being at least half-way to their scheduled announcement time. - // * If it's not going to probe and m->SuppressProbes is not already set then we should announce immediately. - - if (rr->ProbeCount) - { - // If we have no probe suppression time set, or it is in the past, set it now - if (m->SuppressProbes == 0 || m->SuppressProbes - m->timenow < 0) - { - // To allow us to aggregate probes when a group of services are registered together, - // the first probe is delayed 1/4 second. This means the common-case behaviour is: - // 1/4 second wait; probe - // 1/4 second wait; probe - // 1/4 second wait; probe - // 1/4 second wait; announce (i.e. service is normally announced exactly one second after being registered) - m->SuppressProbes = NonZeroTime(m->timenow + DefaultProbeIntervalForTypeUnique/2 + mDNSRandom(DefaultProbeIntervalForTypeUnique/2)); - - // If we already have a *probe* scheduled to go out sooner, then use that time to get better aggregation - if (m->SuppressProbes - m->NextScheduledProbe >= 0) - m->SuppressProbes = NonZeroTime(m->NextScheduledProbe); - if (m->SuppressProbes - m->timenow < 0) // Make sure we don't set m->SuppressProbes excessively in the past - m->SuppressProbes = m->timenow; - - // If we already have a *query* scheduled to go out sooner, then use that time to get better aggregation - if (m->SuppressProbes - m->NextScheduledQuery >= 0) - m->SuppressProbes = NonZeroTime(m->NextScheduledQuery); - if (m->SuppressProbes - m->timenow < 0) // Make sure we don't set m->SuppressProbes excessively in the past - m->SuppressProbes = m->timenow; - - // except... don't expect to be able to send before the m->SuppressSending timer fires - if (m->SuppressSending && m->SuppressProbes - m->SuppressSending < 0) - m->SuppressProbes = NonZeroTime(m->SuppressSending); - - if (m->SuppressProbes - m->timenow > mDNSPlatformOneSecond * 8) - { - LogMsg("InitializeLastAPTime ERROR m->SuppressProbes %d m->NextScheduledProbe %d m->NextScheduledQuery %d m->SuppressSending %d %d", - m->SuppressProbes - m->timenow, - m->NextScheduledProbe - m->timenow, - m->NextScheduledQuery - m->timenow, - m->SuppressSending, - m->SuppressSending - m->timenow); - m->SuppressProbes = NonZeroTime(m->timenow + DefaultProbeIntervalForTypeUnique/2 + mDNSRandom(DefaultProbeIntervalForTypeUnique/2)); - } - } - rr->LastAPTime = m->SuppressProbes - rr->ThisAPInterval; - } - else if (m->SuppressProbes && m->SuppressProbes - m->timenow >= 0) - rr->LastAPTime = m->SuppressProbes - rr->ThisAPInterval + DefaultProbeIntervalForTypeUnique * DefaultProbeCountForTypeUnique + rr->ThisAPInterval / 2; - else - rr->LastAPTime = m->timenow - rr->ThisAPInterval; - - // For reverse-mapping Sleep Proxy PTR records we don't want to start probing instantly -- we - // wait one second to give the client a chance to go to sleep, and then start our ARP/NDP probing. - // After three probes one second apart with no answer, we conclude the client is now sleeping - // and we can begin broadcasting our announcements to take over ownership of that IP address. - // If we don't wait for the client to go to sleep, then when the client sees our ARP Announcements there's a risk - // (depending on the OS and networking stack it's using) that it might interpret it as a conflict and change its IP address. - if (rr->AddressProxy.type) rr->LastAPTime = m->timenow; - - // Unsolicited Neighbor Advertisements (RFC 2461 Section 7.2.6) give us fast address cache updating, - // but some older IPv6 clients get confused by them, so for now we don't send them. Without Unsolicited - // Neighbor Advertisements we have to rely on Neighbor Unreachability Detection instead, which is slower. - // Given this, we'll do our best to wake for existing IPv6 connections, but we don't want to encourage - // new ones for sleeping clients, so we'll we send deletions for our SPS clients' AAAA records. - if (m->KnownBugs & mDNS_KnownBug_LimitedIPv6) - if (rr->WakeUp.HMAC.l[0] && rr->resrec.rrtype == kDNSType_AAAA) - rr->LastAPTime = m->timenow - rr->ThisAPInterval + mDNSPlatformOneSecond * 10; - - // Set LastMCTime to now, to inhibit multicast responses - // (no need to send additional multicast responses when we're announcing anyway) - rr->LastMCTime = m->timenow; - rr->LastMCInterface = mDNSInterfaceMark; - - SetNextAnnounceProbeTime(m, rr); - } - -mDNSlocal const domainname *SetUnicastTargetToHostName(mDNS *const m, AuthRecord *rr) - { - const domainname *target; - if (rr->AutoTarget) - { - // For autotunnel services pointing at our IPv6 ULA we don't need or want a NAT mapping, but for all other - // advertised services referencing our uDNS hostname, we want NAT mappings automatically created as appropriate, - // with the port number in our advertised SRV record automatically tracking the external mapped port. - DomainAuthInfo *AuthInfo = GetAuthInfoForName_internal(m, rr->resrec.name); - if (!AuthInfo || !AuthInfo->AutoTunnel) rr->AutoTarget = Target_AutoHostAndNATMAP; - } - - target = GetServiceTarget(m, rr); - if (!target || target->c[0] == 0) - { - // defer registration until we've got a target - LogInfo("SetUnicastTargetToHostName No target for %s", ARDisplayString(m, rr)); - rr->state = regState_NoTarget; - return mDNSNULL; - } - else - { - LogInfo("SetUnicastTargetToHostName target %##s for resource record %s", target->c, ARDisplayString(m,rr)); - return target; - } - } - -// Right now this only applies to mDNS (.local) services where the target host is always m->MulticastHostname -// Eventually we should unify this with GetServiceTarget() in uDNS.c -mDNSlocal void SetTargetToHostName(mDNS *const m, AuthRecord *const rr) - { - domainname *const target = GetRRDomainNameTarget(&rr->resrec); - const domainname *newname = &m->MulticastHostname; - - if (!target) LogInfo("SetTargetToHostName: Don't know how to set the target of rrtype %s", DNSTypeName(rr->resrec.rrtype)); - - if (!(rr->ForceMCast || rr->ARType == AuthRecordLocalOnly || rr->ARType == AuthRecordP2P || IsLocalDomain(&rr->namestorage))) - { - const domainname *const n = SetUnicastTargetToHostName(m, rr); - if (n) newname = n; - else { target->c[0] = 0; SetNewRData(&rr->resrec, mDNSNULL, 0); return; } - } - - if (target && SameDomainName(target, newname)) - debugf("SetTargetToHostName: Target of %##s is already %##s", rr->resrec.name->c, target->c); - - if (target && !SameDomainName(target, newname)) - { - AssignDomainName(target, newname); - SetNewRData(&rr->resrec, mDNSNULL, 0); // Update rdlength, rdestimate, rdatahash - - // If we're in the middle of probing this record, we need to start again, - // because changing its rdata may change the outcome of the tie-breaker. - // (If the record type is kDNSRecordTypeUnique (unconfirmed unique) then DefaultProbeCountForRecordType is non-zero.) - rr->ProbeCount = DefaultProbeCountForRecordType(rr->resrec.RecordType); - - // If we've announced this record, we really should send a goodbye packet for the old rdata before - // changing to the new rdata. However, in practice, we only do SetTargetToHostName for unique records, - // so when we announce them we'll set the kDNSClass_UniqueRRSet and clear any stale data that way. - if (rr->RequireGoodbye && rr->resrec.RecordType == kDNSRecordTypeShared) - debugf("Have announced shared record %##s (%s) at least once: should have sent a goodbye packet before updating", - rr->resrec.name->c, DNSTypeName(rr->resrec.rrtype)); - - rr->AnnounceCount = InitialAnnounceCount; - rr->RequireGoodbye = mDNSfalse; - InitializeLastAPTime(m, rr); - } - } - -mDNSlocal void AcknowledgeRecord(mDNS *const m, AuthRecord *const rr) - { - if (rr->RecordCallback) - { - // CAUTION: MUST NOT do anything more with rr after calling rr->Callback(), because the client's callback function - // is allowed to do anything, including starting/stopping queries, registering/deregistering records, etc. - rr->Acknowledged = mDNStrue; - mDNS_DropLockBeforeCallback(); // Allow client to legally make mDNS API calls from the callback - rr->RecordCallback(m, rr, mStatus_NoError); - mDNS_ReclaimLockAfterCallback(); // Decrement mDNS_reentrancy to block mDNS API calls again - } - } - -mDNSexport void ActivateUnicastRegistration(mDNS *const m, AuthRecord *const rr) - { - // Make sure that we don't activate the SRV record and associated service records, if it is in - // NoTarget state. First time when a service is being instantiated, SRV record may be in NoTarget state. - // We should not activate any of the other reords (PTR, TXT) that are part of the service. When - // the target becomes available, the records will be reregistered. - if (rr->resrec.rrtype != kDNSType_SRV) - { - AuthRecord *srvRR = mDNSNULL; - if (rr->resrec.rrtype == kDNSType_PTR) - srvRR = rr->Additional1; - else if (rr->resrec.rrtype == kDNSType_TXT) - srvRR = rr->DependentOn; - if (srvRR) - { - if (srvRR->resrec.rrtype != kDNSType_SRV) - { - LogMsg("ActivateUnicastRegistration: ERROR!! Resource record %s wrong, expecting SRV type", ARDisplayString(m, srvRR)); - } - else - { - LogInfo("ActivateUnicastRegistration: Found Service Record %s in state %d for %##s (%s)", - ARDisplayString(m, srvRR), srvRR->state, rr->resrec.name->c, DNSTypeName(rr->resrec.rrtype)); - rr->state = srvRR->state; - } - } - } - - if (rr->state == regState_NoTarget) - { - LogInfo("ActivateUnicastRegistration record %s in regState_NoTarget, not activating", ARDisplayString(m, rr)); - return; - } - // When we wake up from sleep, we call ActivateUnicastRegistration. It is possible that just before we went to sleep, - // the service/record was being deregistered. In that case, we should not try to register again. For the cases where - // the records are deregistered due to e.g., no target for the SRV record, we would have returned from above if it - // was already in NoTarget state. If it was in the process of deregistration but did not complete fully before we went - // to sleep, then it is okay to start in Pending state as we will go back to NoTarget state if we don't have a target. - if (rr->resrec.RecordType == kDNSRecordTypeDeregistering) - { - LogInfo("ActivateUnicastRegistration: Resource record %s, current state %d, moving to DeregPending", ARDisplayString(m, rr), rr->state); - rr->state = regState_DeregPending; - } - else - { - LogInfo("ActivateUnicastRegistration: Resource record %s, current state %d, moving to Pending", ARDisplayString(m, rr), rr->state); - rr->state = regState_Pending; - } - rr->ProbeCount = 0; - rr->AnnounceCount = 0; - rr->ThisAPInterval = INIT_RECORD_REG_INTERVAL; - rr->LastAPTime = m->timenow - rr->ThisAPInterval; - rr->expire = 0; // Forget about all the leases, start fresh - rr->uselease = mDNStrue; - rr->updateid = zeroID; - rr->SRVChanged = mDNSfalse; - rr->updateError = mStatus_NoError; - // RestartRecordGetZoneData calls this function whenever a new interface gets registered with core. - // The records might already be registered with the server and hence could have NAT state. - if (rr->NATinfo.clientContext) - { - mDNS_StopNATOperation_internal(m, &rr->NATinfo); - rr->NATinfo.clientContext = mDNSNULL; - } - if (rr->nta) { CancelGetZoneData(m, rr->nta); rr->nta = mDNSNULL; } - if (rr->tcp) { DisposeTCPConn(rr->tcp); rr->tcp = mDNSNULL; } - if (m->NextuDNSEvent - (rr->LastAPTime + rr->ThisAPInterval) >= 0) - m->NextuDNSEvent = (rr->LastAPTime + rr->ThisAPInterval); - } - -// Two records qualify to be local duplicates if: -// (a) the RecordTypes are the same, or -// (b) one is Unique and the other Verified -// (c) either is in the process of deregistering -#define RecordLDT(A,B) ((A)->resrec.RecordType == (B)->resrec.RecordType || \ - ((A)->resrec.RecordType | (B)->resrec.RecordType) == (kDNSRecordTypeUnique | kDNSRecordTypeVerified) || \ - ((A)->resrec.RecordType == kDNSRecordTypeDeregistering || (B)->resrec.RecordType == kDNSRecordTypeDeregistering)) - -#define RecordIsLocalDuplicate(A,B) \ - ((A)->resrec.InterfaceID == (B)->resrec.InterfaceID && RecordLDT((A),(B)) && IdenticalResourceRecord(&(A)->resrec, &(B)->resrec)) - -mDNSlocal AuthRecord *CheckAuthIdenticalRecord(AuthHash *r, AuthRecord *rr) - { - AuthGroup *a; - AuthGroup **ag = &a; - AuthRecord **rp; - const mDNSu32 slot = AuthHashSlot(rr->resrec.name); - - a = AuthGroupForRecord(r, slot, &rr->resrec); - if (!a) return mDNSNULL; - rp = &(*ag)->members; - while (*rp) - { - if (!RecordIsLocalDuplicate(*rp, rr)) - rp=&(*rp)->next; - else - { - if ((*rp)->resrec.RecordType == kDNSRecordTypeDeregistering) - { - (*rp)->AnnounceCount = 0; - rp=&(*rp)->next; - } - else return *rp; - } - } - return (mDNSNULL); - } - -mDNSlocal mDNSBool CheckAuthRecordConflict(AuthHash *r, AuthRecord *rr) - { - AuthGroup *a; - AuthGroup **ag = &a; - AuthRecord **rp; - const mDNSu32 slot = AuthHashSlot(rr->resrec.name); - - a = AuthGroupForRecord(r, slot, &rr->resrec); - if (!a) return mDNSfalse; - rp = &(*ag)->members; - while (*rp) - { - const AuthRecord *s1 = rr->RRSet ? rr->RRSet : rr; - const AuthRecord *s2 = (*rp)->RRSet ? (*rp)->RRSet : *rp; - if (s1 != s2 && SameResourceRecordSignature((*rp), rr) && !IdenticalSameNameRecord(&(*rp)->resrec, &rr->resrec)) - return mDNStrue; - else - rp=&(*rp)->next; - } - return (mDNSfalse); - } - -// checks to see if "rr" is already present -mDNSlocal AuthRecord *CheckAuthSameRecord(AuthHash *r, AuthRecord *rr) - { - AuthGroup *a; - AuthGroup **ag = &a; - AuthRecord **rp; - const mDNSu32 slot = AuthHashSlot(rr->resrec.name); - - a = AuthGroupForRecord(r, slot, &rr->resrec); - if (!a) return mDNSNULL; - rp = &(*ag)->members; - while (*rp) - { - if (*rp != rr) - rp=&(*rp)->next; - else - { - return *rp; - } - } - return (mDNSNULL); - } - -// Exported so uDNS.c can call this -mDNSexport mStatus mDNS_Register_internal(mDNS *const m, AuthRecord *const rr) - { - domainname *target = GetRRDomainNameTarget(&rr->resrec); - AuthRecord *r; - AuthRecord **p = &m->ResourceRecords; - AuthRecord **d = &m->DuplicateRecords; - - if ((mDNSs32)rr->resrec.rroriginalttl <= 0) - { LogMsg("mDNS_Register_internal: TTL %X should be 1 - 0x7FFFFFFF %s", rr->resrec.rroriginalttl, ARDisplayString(m, rr)); return(mStatus_BadParamErr); } - - if (!rr->resrec.RecordType) - { LogMsg("mDNS_Register_internal: RecordType must be non-zero %s", ARDisplayString(m, rr)); return(mStatus_BadParamErr); } - - if (m->ShutdownTime) - { LogMsg("mDNS_Register_internal: Shutting down, can't register %s", ARDisplayString(m, rr)); return(mStatus_ServiceNotRunning); } - - if (m->DivertMulticastAdvertisements && !AuthRecord_uDNS(rr)) - { - mDNSInterfaceID previousID = rr->resrec.InterfaceID; - if (rr->resrec.InterfaceID == mDNSInterface_Any || rr->resrec.InterfaceID == mDNSInterface_P2P) - { - rr->resrec.InterfaceID = mDNSInterface_LocalOnly; - rr->ARType = AuthRecordLocalOnly; - } - if (rr->resrec.InterfaceID != mDNSInterface_LocalOnly) - { - NetworkInterfaceInfo *intf = FirstInterfaceForID(m, rr->resrec.InterfaceID); - if (intf && !intf->Advertise){ rr->resrec.InterfaceID = mDNSInterface_LocalOnly; rr->ARType = AuthRecordLocalOnly; } - } - if (rr->resrec.InterfaceID != previousID) - LogInfo("mDNS_Register_internal: Diverting record to local-only %s", ARDisplayString(m, rr)); - } - - if (RRLocalOnly(rr)) - { - if (CheckAuthSameRecord(&m->rrauth, rr)) - { - LogMsg("mDNS_Register_internal: ERROR!! Tried to register LocalOnly AuthRecord %p %##s (%s) that's already in the list", - rr, rr->resrec.name->c, DNSTypeName(rr->resrec.rrtype)); - return(mStatus_AlreadyRegistered); - } - } - else - { - while (*p && *p != rr) p=&(*p)->next; - if (*p) - { - LogMsg("mDNS_Register_internal: ERROR!! Tried to register AuthRecord %p %##s (%s) that's already in the list", - rr, rr->resrec.name->c, DNSTypeName(rr->resrec.rrtype)); - return(mStatus_AlreadyRegistered); - } - } - - while (*d && *d != rr) d=&(*d)->next; - if (*d) - { - LogMsg("mDNS_Register_internal: ERROR!! Tried to register AuthRecord %p %##s (%s) that's already in the Duplicate list", - rr, rr->resrec.name->c, DNSTypeName(rr->resrec.rrtype)); - return(mStatus_AlreadyRegistered); - } - - if (rr->DependentOn) - { - if (rr->resrec.RecordType == kDNSRecordTypeUnique) - rr->resrec.RecordType = kDNSRecordTypeVerified; - else - { - LogMsg("mDNS_Register_internal: ERROR! %##s (%s): rr->DependentOn && RecordType != kDNSRecordTypeUnique", - rr->resrec.name->c, DNSTypeName(rr->resrec.rrtype)); - return(mStatus_Invalid); - } - if (!(rr->DependentOn->resrec.RecordType & (kDNSRecordTypeUnique | kDNSRecordTypeVerified | kDNSRecordTypeKnownUnique))) - { - LogMsg("mDNS_Register_internal: ERROR! %##s (%s): rr->DependentOn->RecordType bad type %X", - rr->resrec.name->c, DNSTypeName(rr->resrec.rrtype), rr->DependentOn->resrec.RecordType); - return(mStatus_Invalid); - } - } - - // If this resource record is referencing a specific interface, make sure it exists. - // Skip checks for LocalOnly and P2P as they are not valid InterfaceIDs. Also, for scoped - // entries in /etc/hosts skip that check as that interface may not be valid at this time. - if (rr->resrec.InterfaceID && rr->ARType != AuthRecordLocalOnly && rr->ARType != AuthRecordP2P) - { - NetworkInterfaceInfo *intf = FirstInterfaceForID(m, rr->resrec.InterfaceID); - if (!intf) - { - debugf("mDNS_Register_internal: Bogus InterfaceID %p in resource record", rr->resrec.InterfaceID); - return(mStatus_BadReferenceErr); - } - } - - rr->next = mDNSNULL; - - // Field Group 1: The actual information pertaining to this resource record - // Set up by client prior to call - - // Field Group 2: Persistent metadata for Authoritative Records -// rr->Additional1 = set to mDNSNULL in mDNS_SetupResourceRecord; may be overridden by client -// rr->Additional2 = set to mDNSNULL in mDNS_SetupResourceRecord; may be overridden by client -// rr->DependentOn = set to mDNSNULL in mDNS_SetupResourceRecord; may be overridden by client -// rr->RRSet = set to mDNSNULL in mDNS_SetupResourceRecord; may be overridden by client -// rr->Callback = already set in mDNS_SetupResourceRecord -// rr->Context = already set in mDNS_SetupResourceRecord -// rr->RecordType = already set in mDNS_SetupResourceRecord -// rr->HostTarget = set to mDNSfalse in mDNS_SetupResourceRecord; may be overridden by client -// rr->AllowRemoteQuery = set to mDNSfalse in mDNS_SetupResourceRecord; may be overridden by client - // Make sure target is not uninitialized data, or we may crash writing debugging log messages - if (rr->AutoTarget && target) target->c[0] = 0; - - // Field Group 3: Transient state for Authoritative Records - rr->Acknowledged = mDNSfalse; - rr->ProbeCount = DefaultProbeCountForRecordType(rr->resrec.RecordType); - rr->AnnounceCount = InitialAnnounceCount; - rr->RequireGoodbye = mDNSfalse; - rr->AnsweredLocalQ = mDNSfalse; - rr->IncludeInProbe = mDNSfalse; - rr->ImmedUnicast = mDNSfalse; - rr->SendNSECNow = mDNSNULL; - rr->ImmedAnswer = mDNSNULL; - rr->ImmedAdditional = mDNSNULL; - rr->SendRNow = mDNSNULL; - rr->v4Requester = zerov4Addr; - rr->v6Requester = zerov6Addr; - rr->NextResponse = mDNSNULL; - rr->NR_AnswerTo = mDNSNULL; - rr->NR_AdditionalTo = mDNSNULL; - if (!rr->AutoTarget) InitializeLastAPTime(m, rr); -// rr->LastAPTime = Set for us in InitializeLastAPTime() -// rr->LastMCTime = Set for us in InitializeLastAPTime() -// rr->LastMCInterface = Set for us in InitializeLastAPTime() - rr->NewRData = mDNSNULL; - rr->newrdlength = 0; - rr->UpdateCallback = mDNSNULL; - rr->UpdateCredits = kMaxUpdateCredits; - rr->NextUpdateCredit = 0; - rr->UpdateBlocked = 0; - - // For records we're holding as proxy (except reverse-mapping PTR records) two announcements is sufficient - if (rr->WakeUp.HMAC.l[0] && !rr->AddressProxy.type) rr->AnnounceCount = 2; - - // Field Group 4: Transient uDNS state for Authoritative Records - rr->state = regState_Zero; - rr->uselease = 0; - rr->expire = 0; - rr->Private = 0; - rr->updateid = zeroID; - rr->zone = rr->resrec.name; - rr->nta = mDNSNULL; - rr->tcp = mDNSNULL; - rr->OrigRData = 0; - rr->OrigRDLen = 0; - rr->InFlightRData = 0; - rr->InFlightRDLen = 0; - rr->QueuedRData = 0; - rr->QueuedRDLen = 0; - //mDNSPlatformMemZero(&rr->NATinfo, sizeof(rr->NATinfo)); - // We should be recording the actual internal port for this service record here. Once we initiate our NAT mapping - // request we'll subsequently overwrite srv.port with the allocated external NAT port -- potentially multiple - // times with different values if the external NAT port changes during the lifetime of the service registration. - //if (rr->resrec.rrtype == kDNSType_SRV) rr->NATinfo.IntPort = rr->resrec.rdata->u.srv.port; - -// rr->resrec.interface = already set in mDNS_SetupResourceRecord -// rr->resrec.name->c = MUST be set by client -// rr->resrec.rrtype = already set in mDNS_SetupResourceRecord -// rr->resrec.rrclass = already set in mDNS_SetupResourceRecord -// rr->resrec.rroriginalttl = already set in mDNS_SetupResourceRecord -// rr->resrec.rdata = MUST be set by client, unless record type is CNAME or PTR and rr->HostTarget is set - - // BIND named (name daemon) doesn't allow TXT records with zero-length rdata. This is strictly speaking correct, - // since RFC 1035 specifies a TXT record as "One or more s", not "Zero or more s". - // Since some legacy apps try to create zero-length TXT records, we'll silently correct it here. - if (rr->resrec.rrtype == kDNSType_TXT && rr->resrec.rdlength == 0) { rr->resrec.rdlength = 1; rr->resrec.rdata->u.txt.c[0] = 0; } - - if (rr->AutoTarget) - { - SetTargetToHostName(m, rr); // Also sets rdlength and rdestimate for us, and calls InitializeLastAPTime(); -#ifndef UNICAST_DISABLED - // If we have no target record yet, SetTargetToHostName will set rr->state == regState_NoTarget - // In this case we leave the record half-formed in the list, and later we'll remove it from the list and re-add it properly. - if (rr->state == regState_NoTarget) - { - // Initialize the target so that we don't crash while logging etc. - domainname *tar = GetRRDomainNameTarget(&rr->resrec); - if (tar) tar->c[0] = 0; - LogInfo("mDNS_Register_internal: record %s in NoTarget state", ARDisplayString(m, rr)); - } -#endif - } - else - { - rr->resrec.rdlength = GetRDLength(&rr->resrec, mDNSfalse); - rr->resrec.rdestimate = GetRDLength(&rr->resrec, mDNStrue); - } - - if (!ValidateDomainName(rr->resrec.name)) - { LogMsg("Attempt to register record with invalid name: %s", ARDisplayString(m, rr)); return(mStatus_Invalid); } - - // Don't do this until *after* we've set rr->resrec.rdlength - if (!ValidateRData(rr->resrec.rrtype, rr->resrec.rdlength, rr->resrec.rdata)) - { LogMsg("Attempt to register record with invalid rdata: %s", ARDisplayString(m, rr)); return(mStatus_Invalid); } - - rr->resrec.namehash = DomainNameHashValue(rr->resrec.name); - rr->resrec.rdatahash = target ? DomainNameHashValue(target) : RDataHashValue(&rr->resrec); - - if (RRLocalOnly(rr)) - { - // If this is supposed to be unique, make sure we don't have any name conflicts. - // If we found a conflict, we may still want to insert the record in the list but mark it appropriately - // (kDNSRecordTypeDeregistering) so that we deliver RMV events to the application. But this causes more - // complications and not clear whether there are any benefits. See rdar:9304275 for details. - // Hence, just bail out. - if (rr->resrec.RecordType & kDNSRecordTypeUniqueMask) - { - if (CheckAuthRecordConflict(&m->rrauth, rr)) - { - LogInfo("mDNS_Register_internal: Name conflict %s (%p), InterfaceID %p", ARDisplayString(m, rr), rr, rr->resrec.InterfaceID); - return mStatus_NameConflict; - } - } - } - - // For uDNS records, we don't support duplicate checks at this time. -#ifndef UNICAST_DISABLED - if (AuthRecord_uDNS(rr)) - { - if (!m->NewLocalRecords) m->NewLocalRecords = rr; - // When we called SetTargetToHostName, it may have caused mDNS_Register_internal to be re-entered, appending new - // records to the list, so we now need to update p to advance to the new end to the list before appending our new record. - // Note that for AutoTunnel this should never happen, but this check makes the code future-proof. - while (*p) p=&(*p)->next; - *p = rr; - if (rr->resrec.RecordType == kDNSRecordTypeUnique) rr->resrec.RecordType = kDNSRecordTypeVerified; - rr->ProbeCount = 0; - rr->AnnounceCount = 0; - if (rr->state != regState_NoTarget) ActivateUnicastRegistration(m, rr); - return(mStatus_NoError); // <--- Note: For unicast records, code currently bails out at this point - } -#endif - - // Now that we've finished building our new record, make sure it's not identical to one we already have - if (RRLocalOnly(rr)) - { - rr->ProbeCount = 0; - rr->AnnounceCount = 0; - r = CheckAuthIdenticalRecord(&m->rrauth, rr); - } - else - { - for (r = m->ResourceRecords; r; r=r->next) - if (RecordIsLocalDuplicate(r, rr)) - { - if (r->resrec.RecordType == kDNSRecordTypeDeregistering) r->AnnounceCount = 0; - else break; - } - } - - if (r) - { - debugf("mDNS_Register_internal:Adding to duplicate list %s", ARDisplayString(m,rr)); - *d = rr; - // If the previous copy of this record is already verified unique, - // then indicate that we should move this record promptly to kDNSRecordTypeUnique state. - // Setting ProbeCount to zero will cause SendQueries() to advance this record to - // kDNSRecordTypeVerified state and call the client callback at the next appropriate time. - if (rr->resrec.RecordType == kDNSRecordTypeUnique && r->resrec.RecordType == kDNSRecordTypeVerified) - rr->ProbeCount = 0; - } - else - { - debugf("mDNS_Register_internal: Adding to active record list %s", ARDisplayString(m,rr)); - if (RRLocalOnly(rr)) - { - AuthGroup *ag; - ag = InsertAuthRecord(m, &m->rrauth, rr); - if (ag && !ag->NewLocalOnlyRecords) { - m->NewLocalOnlyRecords = mDNStrue; - ag->NewLocalOnlyRecords = rr; - } - // No probing for LocalOnly records, Acknowledge them right away - if (rr->resrec.RecordType == kDNSRecordTypeUnique) rr->resrec.RecordType = kDNSRecordTypeVerified; - AcknowledgeRecord(m, rr); - return(mStatus_NoError); - } - else - { - if (!m->NewLocalRecords) m->NewLocalRecords = rr; - *p = rr; - } - } - - if (!AuthRecord_uDNS(rr)) // This check is superfluous, given that for unicast records we (currently) bail out above - { - // For records that are not going to probe, acknowledge them right away - if (rr->resrec.RecordType != kDNSRecordTypeUnique && rr->resrec.RecordType != kDNSRecordTypeDeregistering) - AcknowledgeRecord(m, rr); - - // Adding a record may affect whether or not we should sleep - mDNS_UpdateAllowSleep(m); - } - - return(mStatus_NoError); - } - -mDNSlocal void RecordProbeFailure(mDNS *const m, const AuthRecord *const rr) - { - m->ProbeFailTime = m->timenow; - m->NumFailedProbes++; - // If we've had fifteen or more probe failures, rate-limit to one every five seconds. - // If a bunch of hosts have all been configured with the same name, then they'll all - // conflict and run through the same series of names: name-2, name-3, name-4, etc., - // up to name-10. After that they'll start adding random increments in the range 1-100, - // so they're more likely to branch out in the available namespace and settle on a set of - // unique names quickly. If after five more tries the host is still conflicting, then we - // may have a serious problem, so we start rate-limiting so we don't melt down the network. - if (m->NumFailedProbes >= 15) - { - m->SuppressProbes = NonZeroTime(m->timenow + mDNSPlatformOneSecond * 5); - LogMsg("Excessive name conflicts (%lu) for %##s (%s); rate limiting in effect", - m->NumFailedProbes, rr->resrec.name->c, DNSTypeName(rr->resrec.rrtype)); - } - } - -mDNSlocal void CompleteRDataUpdate(mDNS *const m, AuthRecord *const rr) - { - RData *OldRData = rr->resrec.rdata; - mDNSu16 OldRDLen = rr->resrec.rdlength; - SetNewRData(&rr->resrec, rr->NewRData, rr->newrdlength); // Update our rdata - rr->NewRData = mDNSNULL; // Clear the NewRData pointer ... - if (rr->UpdateCallback) - rr->UpdateCallback(m, rr, OldRData, OldRDLen); // ... and let the client know - } - -// Note: mDNS_Deregister_internal can call a user callback, which may change the record list and/or question list. -// Any code walking either list must use the CurrentQuestion and/or CurrentRecord mechanism to protect against this. -// Exported so uDNS.c can call this -mDNSexport mStatus mDNS_Deregister_internal(mDNS *const m, AuthRecord *const rr, mDNS_Dereg_type drt) - { - AuthRecord *r2; - mDNSu8 RecordType = rr->resrec.RecordType; - AuthRecord **p = &m->ResourceRecords; // Find this record in our list of active records - mDNSBool dupList = mDNSfalse; - - if (RRLocalOnly(rr)) - { - AuthGroup *a; - AuthGroup **ag = &a; - AuthRecord **rp; - const mDNSu32 slot = AuthHashSlot(rr->resrec.name); - - a = AuthGroupForRecord(&m->rrauth, slot, &rr->resrec); - if (!a) return mDNSfalse; - rp = &(*ag)->members; - while (*rp && *rp != rr) rp=&(*rp)->next; - p = rp; - } - else - { - while (*p && *p != rr) p=&(*p)->next; - } - - if (*p) - { - // We found our record on the main list. See if there are any duplicates that need special handling. - if (drt == mDNS_Dereg_conflict) // If this was a conflict, see that all duplicates get the same treatment - { - // Scan for duplicates of rr, and mark them for deregistration at the end of this routine, after we've finished - // deregistering rr. We need to do this scan *before* we give the client the chance to free and reuse the rr memory. - for (r2 = m->DuplicateRecords; r2; r2=r2->next) if (RecordIsLocalDuplicate(r2, rr)) r2->ProbeCount = 0xFF; - } - else - { - // Before we delete the record (and potentially send a goodbye packet) - // first see if we have a record on the duplicate list ready to take over from it. - AuthRecord **d = &m->DuplicateRecords; - while (*d && !RecordIsLocalDuplicate(*d, rr)) d=&(*d)->next; - if (*d) - { - AuthRecord *dup = *d; - debugf("mDNS_Register_internal: Duplicate record %p taking over from %p %##s (%s)", - dup, rr, rr->resrec.name->c, DNSTypeName(rr->resrec.rrtype)); - *d = dup->next; // Cut replacement record from DuplicateRecords list - if (RRLocalOnly(rr)) - { - dup->next = mDNSNULL; - if (!InsertAuthRecord(m, &m->rrauth, dup)) LogMsg("mDNS_Deregister_internal: ERROR!! cannot insert %s", ARDisplayString(m, dup)); - } - else - { - dup->next = rr->next; // And then... - rr->next = dup; // ... splice it in right after the record we're about to delete - } - dup->resrec.RecordType = rr->resrec.RecordType; - dup->ProbeCount = rr->ProbeCount; - dup->AnnounceCount = rr->AnnounceCount; - dup->RequireGoodbye = rr->RequireGoodbye; - dup->AnsweredLocalQ = rr->AnsweredLocalQ; - dup->ImmedAnswer = rr->ImmedAnswer; - dup->ImmedUnicast = rr->ImmedUnicast; - dup->ImmedAdditional = rr->ImmedAdditional; - dup->v4Requester = rr->v4Requester; - dup->v6Requester = rr->v6Requester; - dup->ThisAPInterval = rr->ThisAPInterval; - dup->LastAPTime = rr->LastAPTime; - dup->LastMCTime = rr->LastMCTime; - dup->LastMCInterface = rr->LastMCInterface; - dup->Private = rr->Private; - dup->state = rr->state; - rr->RequireGoodbye = mDNSfalse; - rr->AnsweredLocalQ = mDNSfalse; - } - } - } - else - { - // We didn't find our record on the main list; try the DuplicateRecords list instead. - p = &m->DuplicateRecords; - while (*p && *p != rr) p=&(*p)->next; - // If we found our record on the duplicate list, then make sure we don't send a goodbye for it - if (*p) { rr->RequireGoodbye = mDNSfalse; dupList = mDNStrue; } - if (*p) debugf("mDNS_Deregister_internal: Deleting DuplicateRecord %p %##s (%s)", - rr, rr->resrec.name->c, DNSTypeName(rr->resrec.rrtype)); - } - - if (!*p) - { - // No need to log an error message if we already know this is a potentially repeated deregistration - if (drt != mDNS_Dereg_repeat) - LogMsg("mDNS_Deregister_internal: Record %p not found in list %s", rr, ARDisplayString(m,rr)); - return(mStatus_BadReferenceErr); - } - - // If this is a shared record and we've announced it at least once, - // we need to retract that announcement before we delete the record - - // If this is a record (including mDNSInterface_LocalOnly records) for which we've given local-only answers then - // it's tempting to just do "AnswerAllLocalQuestionsWithLocalAuthRecord(m, rr, mDNSfalse)" here, but that would not not be safe. - // The AnswerAllLocalQuestionsWithLocalAuthRecord routine walks the question list invoking client callbacks, using the "m->CurrentQuestion" - // mechanism to cope with the client callback modifying the question list while that's happening. - // However, mDNS_Deregister could have been called from a client callback (e.g. from the domain enumeration callback FoundDomain) - // which means that the "m->CurrentQuestion" mechanism is already in use to protect that list, so we can't use it twice. - // More generally, if we invoke callbacks from within a client callback, then those callbacks could deregister other - // records, thereby invoking yet more callbacks, without limit. - // The solution is to defer delivering the "Remove" events until mDNS_Execute time, just like we do for sending - // actual goodbye packets. - -#ifndef UNICAST_DISABLED - if (AuthRecord_uDNS(rr)) - { - if (rr->RequireGoodbye) - { - if (rr->tcp) { DisposeTCPConn(rr->tcp); rr->tcp = mDNSNULL; } - rr->resrec.RecordType = kDNSRecordTypeDeregistering; - m->LocalRemoveEvents = mDNStrue; - uDNS_DeregisterRecord(m, rr); - // At this point unconditionally we bail out - // Either uDNS_DeregisterRecord will have completed synchronously, and called CompleteDeregistration, - // which calls us back here with RequireGoodbye set to false, or it will have initiated the deregistration - // process and will complete asynchronously. Either way we don't need to do anything more here. - return(mStatus_NoError); - } - // Sometimes the records don't complete proper deregistration i.e., don't wait for a response - // from the server. In that case, if the records have been part of a group update, clear the - // state here. Some recors e.g., AutoTunnel gets reused without ever being completely initialized - rr->updateid = zeroID; - - // We defer cleaning up NAT state only after sending goodbyes. This is important because - // RecordRegistrationGotZoneData guards against creating NAT state if clientContext is non-NULL. - // This happens today when we turn on/off interface where we get multiple network transitions - // and RestartRecordGetZoneData triggers re-registration of the resource records even though - // they may be in Registered state which causes NAT information to be setup multiple times. Defering - // the cleanup here keeps clientContext non-NULL and hence prevents that. Note that cleaning up - // NAT state here takes care of the case where we did not send goodbyes at all. - if (rr->NATinfo.clientContext) - { - mDNS_StopNATOperation_internal(m, &rr->NATinfo); - rr->NATinfo.clientContext = mDNSNULL; - } - if (rr->nta) { CancelGetZoneData(m, rr->nta); rr->nta = mDNSNULL; } - if (rr->tcp) { DisposeTCPConn(rr->tcp); rr->tcp = mDNSNULL; } - } -#endif // UNICAST_DISABLED - - if (RecordType == kDNSRecordTypeUnregistered) - LogMsg("mDNS_Deregister_internal: %s already marked kDNSRecordTypeUnregistered", ARDisplayString(m, rr)); - else if (RecordType == kDNSRecordTypeDeregistering) - { - LogMsg("mDNS_Deregister_internal: %s already marked kDNSRecordTypeDeregistering", ARDisplayString(m, rr)); - return(mStatus_BadReferenceErr); - } - - // Local-only questions don't get remove events for unique records - // We may want to consider changing this code so that we generate local-only question "rmv" - // events (and maybe goodbye packets too) for unique records as well as for shared records - // Note: If we change the logic for this "if" statement, need to ensure that the code in - // CompleteDeregistration() sets the appropriate state variables to gaurantee that "else" - // clause will execute here and the record will be cut from the list. - if (rr->WakeUp.HMAC.l[0] || - (RecordType == kDNSRecordTypeShared && (rr->RequireGoodbye || rr->AnsweredLocalQ))) - { - verbosedebugf("mDNS_Deregister_internal: Starting deregistration for %s", ARDisplayString(m, rr)); - rr->resrec.RecordType = kDNSRecordTypeDeregistering; - rr->resrec.rroriginalttl = 0; - rr->AnnounceCount = rr->WakeUp.HMAC.l[0] ? WakeupCount : (drt == mDNS_Dereg_rapid) ? 1 : GoodbyeCount; - rr->ThisAPInterval = mDNSPlatformOneSecond * 2; - rr->LastAPTime = m->timenow - rr->ThisAPInterval; - m->LocalRemoveEvents = mDNStrue; - if (m->NextScheduledResponse - (m->timenow + mDNSPlatformOneSecond/10) >= 0) - m->NextScheduledResponse = (m->timenow + mDNSPlatformOneSecond/10); - } - else - { - if (!dupList && RRLocalOnly(rr)) - { - AuthGroup *ag = RemoveAuthRecord(m, &m->rrauth, rr); - if (ag->NewLocalOnlyRecords == rr) ag->NewLocalOnlyRecords = rr->next; - } - else - { - *p = rr->next; // Cut this record from the list - if (m->NewLocalRecords == rr) m->NewLocalRecords = rr->next; - } - // If someone is about to look at this, bump the pointer forward - if (m->CurrentRecord == rr) m->CurrentRecord = rr->next; - rr->next = mDNSNULL; - - // Should we generate local remove events here? - // i.e. something like: - // if (rr->AnsweredLocalQ) { AnswerAllLocalQuestionsWithLocalAuthRecord(m, rr, mDNSfalse); rr->AnsweredLocalQ = mDNSfalse; } - - verbosedebugf("mDNS_Deregister_internal: Deleting record for %s", ARDisplayString(m, rr)); - rr->resrec.RecordType = kDNSRecordTypeUnregistered; - - if ((drt == mDNS_Dereg_conflict || drt == mDNS_Dereg_repeat) && RecordType == kDNSRecordTypeShared) - debugf("mDNS_Deregister_internal: Cannot have a conflict on a shared record! %##s (%s)", - rr->resrec.name->c, DNSTypeName(rr->resrec.rrtype)); - - // If we have an update queued up which never executed, give the client a chance to free that memory - if (rr->NewRData) CompleteRDataUpdate(m, rr); // Update our rdata, clear the NewRData pointer, and return memory to the client - - - // CAUTION: MUST NOT do anything more with rr after calling rr->Callback(), because the client's callback function - // is allowed to do anything, including starting/stopping queries, registering/deregistering records, etc. - // In this case the likely client action to the mStatus_MemFree message is to free the memory, - // so any attempt to touch rr after this is likely to lead to a crash. - if (drt != mDNS_Dereg_conflict) - { - mDNS_DropLockBeforeCallback(); // Allow client to legally make mDNS API calls from the callback - LogInfo("mDNS_Deregister_internal: mStatus_MemFree for %s", ARDisplayString(m, rr)); - if (rr->RecordCallback) - rr->RecordCallback(m, rr, mStatus_MemFree); // MUST NOT touch rr after this - mDNS_ReclaimLockAfterCallback(); // Decrement mDNS_reentrancy to block mDNS API calls again - } - else - { - RecordProbeFailure(m, rr); - mDNS_DropLockBeforeCallback(); // Allow client to legally make mDNS API calls from the callback - if (rr->RecordCallback) - rr->RecordCallback(m, rr, mStatus_NameConflict); // MUST NOT touch rr after this - mDNS_ReclaimLockAfterCallback(); // Decrement mDNS_reentrancy to block mDNS API calls again - // Now that we've finished deregistering rr, check our DuplicateRecords list for any that we marked previously. - // Note that with all the client callbacks going on, by the time we get here all the - // records we marked may have been explicitly deregistered by the client anyway. - r2 = m->DuplicateRecords; - while (r2) - { - if (r2->ProbeCount != 0xFF) r2 = r2->next; - else { mDNS_Deregister_internal(m, r2, mDNS_Dereg_conflict); r2 = m->DuplicateRecords; } - } - } - } - mDNS_UpdateAllowSleep(m); - return(mStatus_NoError); - } - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - Packet Sending Functions -#endif - -mDNSlocal void AddRecordToResponseList(AuthRecord ***nrpp, AuthRecord *rr, AuthRecord *add) - { - if (rr->NextResponse == mDNSNULL && *nrpp != &rr->NextResponse) - { - **nrpp = rr; - // NR_AdditionalTo must point to a record with NR_AnswerTo set (and not NR_AdditionalTo) - // If 'add' does not meet this requirement, then follow its NR_AdditionalTo pointer to a record that does - // The referenced record will definitely be acceptable (by recursive application of this rule) - if (add && add->NR_AdditionalTo) add = add->NR_AdditionalTo; - rr->NR_AdditionalTo = add; - *nrpp = &rr->NextResponse; - } - debugf("AddRecordToResponseList: %##s (%s) already in list", rr->resrec.name->c, DNSTypeName(rr->resrec.rrtype)); - } - -mDNSlocal void AddAdditionalsToResponseList(mDNS *const m, AuthRecord *ResponseRecords, AuthRecord ***nrpp, const mDNSInterfaceID InterfaceID) - { - AuthRecord *rr, *rr2; - for (rr=ResponseRecords; rr; rr=rr->NextResponse) // For each record we plan to put - { - // (Note: This is an "if", not a "while". If we add a record, we'll find it again - // later in the "for" loop, and we will follow further "additional" links then.) - if (rr->Additional1 && ResourceRecordIsValidInterfaceAnswer(rr->Additional1, InterfaceID)) - AddRecordToResponseList(nrpp, rr->Additional1, rr); - - if (rr->Additional2 && ResourceRecordIsValidInterfaceAnswer(rr->Additional2, InterfaceID)) - AddRecordToResponseList(nrpp, rr->Additional2, rr); - - // For SRV records, automatically add the Address record(s) for the target host - if (rr->resrec.rrtype == kDNSType_SRV) - { - for (rr2=m->ResourceRecords; rr2; rr2=rr2->next) // Scan list of resource records - if (RRTypeIsAddressType(rr2->resrec.rrtype) && // For all address records (A/AAAA) ... - ResourceRecordIsValidInterfaceAnswer(rr2, InterfaceID) && // ... which are valid for answer ... - rr->resrec.rdatahash == rr2->resrec.namehash && // ... whose name is the name of the SRV target - SameDomainName(&rr->resrec.rdata->u.srv.target, rr2->resrec.name)) - AddRecordToResponseList(nrpp, rr2, rr); - } - else if (RRTypeIsAddressType(rr->resrec.rrtype)) // For A or AAAA, put counterpart as additional - { - for (rr2=m->ResourceRecords; rr2; rr2=rr2->next) // Scan list of resource records - if (RRTypeIsAddressType(rr2->resrec.rrtype) && // For all address records (A/AAAA) ... - ResourceRecordIsValidInterfaceAnswer(rr2, InterfaceID) && // ... which are valid for answer ... - rr->resrec.namehash == rr2->resrec.namehash && // ... and have the same name - SameDomainName(rr->resrec.name, rr2->resrec.name)) - AddRecordToResponseList(nrpp, rr2, rr); - } - else if (rr->resrec.rrtype == kDNSType_PTR) // For service PTR, see if we want to add DeviceInfo record - { - if (ResourceRecordIsValidInterfaceAnswer(&m->DeviceInfo, InterfaceID) && - SameDomainLabel(rr->resrec.rdata->u.name.c, m->DeviceInfo.resrec.name->c)) - AddRecordToResponseList(nrpp, &m->DeviceInfo, rr); - } - } - } - -mDNSlocal void SendDelayedUnicastResponse(mDNS *const m, const mDNSAddr *const dest, const mDNSInterfaceID InterfaceID) - { - AuthRecord *rr; - AuthRecord *ResponseRecords = mDNSNULL; - AuthRecord **nrp = &ResponseRecords; - - // Make a list of all our records that need to be unicast to this destination - for (rr = m->ResourceRecords; rr; rr=rr->next) - { - // If we find we can no longer unicast this answer, clear ImmedUnicast - if (rr->ImmedAnswer == mDNSInterfaceMark || - mDNSSameIPv4Address(rr->v4Requester, onesIPv4Addr) || - mDNSSameIPv6Address(rr->v6Requester, onesIPv6Addr) ) - rr->ImmedUnicast = mDNSfalse; - - if (rr->ImmedUnicast && rr->ImmedAnswer == InterfaceID) - if ((dest->type == mDNSAddrType_IPv4 && mDNSSameIPv4Address(rr->v4Requester, dest->ip.v4)) || - (dest->type == mDNSAddrType_IPv6 && mDNSSameIPv6Address(rr->v6Requester, dest->ip.v6))) - { - rr->ImmedAnswer = mDNSNULL; // Clear the state fields - rr->ImmedUnicast = mDNSfalse; - rr->v4Requester = zerov4Addr; - rr->v6Requester = zerov6Addr; - if (rr->NextResponse == mDNSNULL && nrp != &rr->NextResponse) // rr->NR_AnswerTo - { rr->NR_AnswerTo = (mDNSu8*)~0; *nrp = rr; nrp = &rr->NextResponse; } - } - } - - AddAdditionalsToResponseList(m, ResponseRecords, &nrp, InterfaceID); - - while (ResponseRecords) - { - mDNSu8 *responseptr = m->omsg.data; - mDNSu8 *newptr; - InitializeDNSMessage(&m->omsg.h, zeroID, ResponseFlags); - - // Put answers in the packet - while (ResponseRecords && ResponseRecords->NR_AnswerTo) - { - rr = ResponseRecords; - if (rr->resrec.RecordType & kDNSRecordTypeUniqueMask) - rr->resrec.rrclass |= kDNSClass_UniqueRRSet; // Temporarily set the cache flush bit so PutResourceRecord will set it - newptr = PutResourceRecord(&m->omsg, responseptr, &m->omsg.h.numAnswers, &rr->resrec); - rr->resrec.rrclass &= ~kDNSClass_UniqueRRSet; // Make sure to clear cache flush bit back to normal state - if (!newptr && m->omsg.h.numAnswers) break; // If packet full, send it now - if (newptr) responseptr = newptr; - ResponseRecords = rr->NextResponse; - rr->NextResponse = mDNSNULL; - rr->NR_AnswerTo = mDNSNULL; - rr->NR_AdditionalTo = mDNSNULL; - rr->RequireGoodbye = mDNStrue; - } - - // Add additionals, if there's space - while (ResponseRecords && !ResponseRecords->NR_AnswerTo) - { - rr = ResponseRecords; - if (rr->resrec.RecordType & kDNSRecordTypeUniqueMask) - rr->resrec.rrclass |= kDNSClass_UniqueRRSet; // Temporarily set the cache flush bit so PutResourceRecord will set it - newptr = PutResourceRecord(&m->omsg, responseptr, &m->omsg.h.numAdditionals, &rr->resrec); - rr->resrec.rrclass &= ~kDNSClass_UniqueRRSet; // Make sure to clear cache flush bit back to normal state - - if (newptr) responseptr = newptr; - if (newptr && m->omsg.h.numAnswers) rr->RequireGoodbye = mDNStrue; - else if (rr->resrec.RecordType & kDNSRecordTypeUniqueMask) rr->ImmedAnswer = mDNSInterfaceMark; - ResponseRecords = rr->NextResponse; - rr->NextResponse = mDNSNULL; - rr->NR_AnswerTo = mDNSNULL; - rr->NR_AdditionalTo = mDNSNULL; - } - - if (m->omsg.h.numAnswers) - mDNSSendDNSMessage(m, &m->omsg, responseptr, InterfaceID, mDNSNULL, dest, MulticastDNSPort, mDNSNULL, mDNSNULL); - } - } - -// CompleteDeregistration guarantees that on exit the record will have been cut from the m->ResourceRecords list -// and the client's mStatus_MemFree callback will have been invoked -mDNSexport void CompleteDeregistration(mDNS *const m, AuthRecord *rr) - { - LogInfo("CompleteDeregistration: called for Resource record %s", ARDisplayString(m, rr)); - // Clearing rr->RequireGoodbye signals mDNS_Deregister_internal() that - // it should go ahead and immediately dispose of this registration - rr->resrec.RecordType = kDNSRecordTypeShared; - rr->RequireGoodbye = mDNSfalse; - rr->WakeUp.HMAC = zeroEthAddr; - if (rr->AnsweredLocalQ) { AnswerAllLocalQuestionsWithLocalAuthRecord(m, rr, mDNSfalse); rr->AnsweredLocalQ = mDNSfalse; } - mDNS_Deregister_internal(m, rr, mDNS_Dereg_normal); // Don't touch rr after this - } - -// DiscardDeregistrations is used on shutdown and sleep to discard (forcibly and immediately) -// any deregistering records that remain in the m->ResourceRecords list. -// DiscardDeregistrations calls mDNS_Deregister_internal which can call a user callback, -// which may change the record list and/or question list. -// Any code walking either list must use the CurrentQuestion and/or CurrentRecord mechanism to protect against this. -mDNSlocal void DiscardDeregistrations(mDNS *const m) - { - if (m->CurrentRecord) - LogMsg("DiscardDeregistrations ERROR m->CurrentRecord already set %s", ARDisplayString(m, m->CurrentRecord)); - m->CurrentRecord = m->ResourceRecords; - - while (m->CurrentRecord) - { - AuthRecord *rr = m->CurrentRecord; - if (!AuthRecord_uDNS(rr) && rr->resrec.RecordType == kDNSRecordTypeDeregistering) - CompleteDeregistration(m, rr); // Don't touch rr after this - else - m->CurrentRecord = rr->next; - } - } - -mDNSlocal mStatus GetLabelDecimalValue(const mDNSu8 *const src, mDNSu8 *dst) - { - int i, val = 0; - if (src[0] < 1 || src[0] > 3) return(mStatus_Invalid); - for (i=1; i<=src[0]; i++) - { - if (src[i] < '0' || src[i] > '9') return(mStatus_Invalid); - val = val * 10 + src[i] - '0'; - } - if (val > 255) return(mStatus_Invalid); - *dst = (mDNSu8)val; - return(mStatus_NoError); - } - -mDNSlocal mStatus GetIPv4FromName(mDNSAddr *const a, const domainname *const name) - { - int skip = CountLabels(name) - 6; - if (skip < 0) { LogMsg("GetIPFromName: Need six labels in IPv4 reverse mapping name %##s", name); return mStatus_Invalid; } - if (GetLabelDecimalValue(SkipLeadingLabels(name, skip+3)->c, &a->ip.v4.b[0]) || - GetLabelDecimalValue(SkipLeadingLabels(name, skip+2)->c, &a->ip.v4.b[1]) || - GetLabelDecimalValue(SkipLeadingLabels(name, skip+1)->c, &a->ip.v4.b[2]) || - GetLabelDecimalValue(SkipLeadingLabels(name, skip+0)->c, &a->ip.v4.b[3])) return mStatus_Invalid; - a->type = mDNSAddrType_IPv4; - return(mStatus_NoError); - } - -#define HexVal(X) ( ((X) >= '0' && (X) <= '9') ? ((X) - '0' ) : \ - ((X) >= 'A' && (X) <= 'F') ? ((X) - 'A' + 10) : \ - ((X) >= 'a' && (X) <= 'f') ? ((X) - 'a' + 10) : -1) - -mDNSlocal mStatus GetIPv6FromName(mDNSAddr *const a, const domainname *const name) - { - int i, h, l; - const domainname *n; - - int skip = CountLabels(name) - 34; - if (skip < 0) { LogMsg("GetIPFromName: Need 34 labels in IPv6 reverse mapping name %##s", name); return mStatus_Invalid; } - - n = SkipLeadingLabels(name, skip); - for (i=0; i<16; i++) - { - if (n->c[0] != 1) return mStatus_Invalid; - l = HexVal(n->c[1]); - n = (const domainname *)(n->c + 2); - - if (n->c[0] != 1) return mStatus_Invalid; - h = HexVal(n->c[1]); - n = (const domainname *)(n->c + 2); - - if (l<0 || h<0) return mStatus_Invalid; - a->ip.v6.b[15-i] = (mDNSu8)((h << 4) | l); - } - - a->type = mDNSAddrType_IPv6; - return(mStatus_NoError); - } - -mDNSlocal mDNSs32 ReverseMapDomainType(const domainname *const name) - { - int skip = CountLabels(name) - 2; - if (skip >= 0) - { - const domainname *suffix = SkipLeadingLabels(name, skip); - if (SameDomainName(suffix, (const domainname*)"\x7" "in-addr" "\x4" "arpa")) return mDNSAddrType_IPv4; - if (SameDomainName(suffix, (const domainname*)"\x3" "ip6" "\x4" "arpa")) return mDNSAddrType_IPv6; - } - return(mDNSAddrType_None); - } - -mDNSlocal void SendARP(mDNS *const m, const mDNSu8 op, const AuthRecord *const rr, - const mDNSv4Addr *const spa, const mDNSEthAddr *const tha, const mDNSv4Addr *const tpa, const mDNSEthAddr *const dst) - { - int i; - mDNSu8 *ptr = m->omsg.data; - NetworkInterfaceInfo *intf = FirstInterfaceForID(m, rr->resrec.InterfaceID); - if (!intf) { LogMsg("SendARP: No interface with InterfaceID %p found %s", rr->resrec.InterfaceID, ARDisplayString(m,rr)); return; } - - // 0x00 Destination address - for (i=0; i<6; i++) *ptr++ = dst->b[i]; - - // 0x06 Source address (Note: Since we don't currently set the BIOCSHDRCMPLT option, BPF will fill in the real interface address for us) - for (i=0; i<6; i++) *ptr++ = intf->MAC.b[0]; - - // 0x0C ARP Ethertype (0x0806) - *ptr++ = 0x08; *ptr++ = 0x06; - - // 0x0E ARP header - *ptr++ = 0x00; *ptr++ = 0x01; // Hardware address space; Ethernet = 1 - *ptr++ = 0x08; *ptr++ = 0x00; // Protocol address space; IP = 0x0800 - *ptr++ = 6; // Hardware address length - *ptr++ = 4; // Protocol address length - *ptr++ = 0x00; *ptr++ = op; // opcode; Request = 1, Response = 2 - - // 0x16 Sender hardware address (our MAC address) - for (i=0; i<6; i++) *ptr++ = intf->MAC.b[i]; - - // 0x1C Sender protocol address - for (i=0; i<4; i++) *ptr++ = spa->b[i]; - - // 0x20 Target hardware address - for (i=0; i<6; i++) *ptr++ = tha->b[i]; - - // 0x26 Target protocol address - for (i=0; i<4; i++) *ptr++ = tpa->b[i]; - - // 0x2A Total ARP Packet length 42 bytes - mDNSPlatformSendRawPacket(m->omsg.data, ptr, rr->resrec.InterfaceID); - } - -mDNSlocal mDNSu16 CheckSum(const void *const data, mDNSs32 length, mDNSu32 sum) - { - const mDNSu16 *ptr = data; - while (length > 0) { length -= 2; sum += *ptr++; } - sum = (sum & 0xFFFF) + (sum >> 16); - sum = (sum & 0xFFFF) + (sum >> 16); - return(sum != 0xFFFF ? sum : 0); - } - -mDNSlocal mDNSu16 IPv6CheckSum(const mDNSv6Addr *const src, const mDNSv6Addr *const dst, const mDNSu8 protocol, const void *const data, const mDNSu32 length) - { - IPv6PseudoHeader ph; - ph.src = *src; - ph.dst = *dst; - ph.len.b[0] = length >> 24; - ph.len.b[1] = length >> 16; - ph.len.b[2] = length >> 8; - ph.len.b[3] = length; - ph.pro.b[0] = 0; - ph.pro.b[1] = 0; - ph.pro.b[2] = 0; - ph.pro.b[3] = protocol; - return CheckSum(&ph, sizeof(ph), CheckSum(data, length, 0)); - } - -mDNSlocal void SendNDP(mDNS *const m, const mDNSu8 op, const mDNSu8 flags, const AuthRecord *const rr, - const mDNSv6Addr *const spa, const mDNSEthAddr *const tha, const mDNSv6Addr *const tpa, const mDNSEthAddr *const dst) - { - int i; - mDNSOpaque16 checksum; - mDNSu8 *ptr = m->omsg.data; - // Some recipient hosts seem to ignore Neighbor Solicitations if the IPv6-layer destination address is not the - // appropriate IPv6 solicited node multicast address, so we use that IPv6-layer destination address, even though - // at the Ethernet-layer we unicast the packet to the intended target, to avoid wasting network bandwidth. - const mDNSv6Addr mc = { { 0xFF,0x02,0x00,0x00, 0,0,0,0, 0,0,0,1, 0xFF,tpa->b[0xD],tpa->b[0xE],tpa->b[0xF] } }; - const mDNSv6Addr *const v6dst = (op == NDP_Sol) ? &mc : tpa; - NetworkInterfaceInfo *intf = FirstInterfaceForID(m, rr->resrec.InterfaceID); - if (!intf) { LogMsg("SendNDP: No interface with InterfaceID %p found %s", rr->resrec.InterfaceID, ARDisplayString(m,rr)); return; } - - // 0x00 Destination address - for (i=0; i<6; i++) *ptr++ = dst->b[i]; - // Right now we only send Neighbor Solicitations to verify whether the host we're proxying for has gone to sleep yet. - // Since we know who we're looking for, we send it via Ethernet-layer unicast, rather than bothering every host on the - // link with a pointless link-layer multicast. - // Should we want to send traditional Neighbor Solicitations in the future, where we really don't know in advance what - // Ethernet-layer address we're looking for, we'll need to send to the appropriate Ethernet-layer multicast address: - // *ptr++ = 0x33; - // *ptr++ = 0x33; - // *ptr++ = 0xFF; - // *ptr++ = tpa->b[0xD]; - // *ptr++ = tpa->b[0xE]; - // *ptr++ = tpa->b[0xF]; - - // 0x06 Source address (Note: Since we don't currently set the BIOCSHDRCMPLT option, BPF will fill in the real interface address for us) - for (i=0; i<6; i++) *ptr++ = (tha ? *tha : intf->MAC).b[i]; - - // 0x0C IPv6 Ethertype (0x86DD) - *ptr++ = 0x86; *ptr++ = 0xDD; - - // 0x0E IPv6 header - *ptr++ = 0x60; *ptr++ = 0x00; *ptr++ = 0x00; *ptr++ = 0x00; // Version, Traffic Class, Flow Label - *ptr++ = 0x00; *ptr++ = 0x20; // Length - *ptr++ = 0x3A; // Protocol == ICMPv6 - *ptr++ = 0xFF; // Hop Limit - - // 0x16 Sender IPv6 address - for (i=0; i<16; i++) *ptr++ = spa->b[i]; - - // 0x26 Destination IPv6 address - for (i=0; i<16; i++) *ptr++ = v6dst->b[i]; - - // 0x36 NDP header - *ptr++ = op; // 0x87 == Neighbor Solicitation, 0x88 == Neighbor Advertisement - *ptr++ = 0x00; // Code - *ptr++ = 0x00; *ptr++ = 0x00; // Checksum placeholder (0x38, 0x39) - *ptr++ = flags; - *ptr++ = 0x00; *ptr++ = 0x00; *ptr++ = 0x00; - - if (op == NDP_Sol) // Neighbor Solicitation. The NDP "target" is the address we seek. - { - // 0x3E NDP target. - for (i=0; i<16; i++) *ptr++ = tpa->b[i]; - // 0x4E Source Link-layer Address - // - // MUST NOT be included when the source IP address is the unspecified address. - // Otherwise, on link layers that have addresses this option MUST be included - // in multicast solicitations and SHOULD be included in unicast solicitations. - if (!mDNSIPv6AddressIsZero(*spa)) - { - *ptr++ = NDP_SrcLL; // Option Type 1 == Source Link-layer Address - *ptr++ = 0x01; // Option length 1 (in units of 8 octets) - for (i=0; i<6; i++) *ptr++ = (tha ? *tha : intf->MAC).b[i]; - } - } - else // Neighbor Advertisement. The NDP "target" is the address we're giving information about. - { - // 0x3E NDP target. - for (i=0; i<16; i++) *ptr++ = spa->b[i]; - // 0x4E Target Link-layer Address - *ptr++ = NDP_TgtLL; // Option Type 2 == Target Link-layer Address - *ptr++ = 0x01; // Option length 1 (in units of 8 octets) - for (i=0; i<6; i++) *ptr++ = (tha ? *tha : intf->MAC).b[i]; - } - - // 0x4E or 0x56 Total NDP Packet length 78 or 86 bytes - m->omsg.data[0x13] = ptr - &m->omsg.data[0x36]; // Compute actual length - checksum.NotAnInteger = ~IPv6CheckSum(spa, v6dst, 0x3A, &m->omsg.data[0x36], m->omsg.data[0x13]); - m->omsg.data[0x38] = checksum.b[0]; - m->omsg.data[0x39] = checksum.b[1]; - - mDNSPlatformSendRawPacket(m->omsg.data, ptr, rr->resrec.InterfaceID); - } - -mDNSlocal void SetupOwnerOpt(const mDNS *const m, const NetworkInterfaceInfo *const intf, rdataOPT *const owner) - { - owner->u.owner.vers = 0; - owner->u.owner.seq = m->SleepSeqNum; - owner->u.owner.HMAC = m->PrimaryMAC; - owner->u.owner.IMAC = intf->MAC; - owner->u.owner.password = zeroEthAddr; - - // Don't try to compute the optlen until *after* we've set up the data fields - // Right now the DNSOpt_Owner_Space macro does not depend on the owner->u.owner being set up correctly, but in the future it might - owner->opt = kDNSOpt_Owner; - owner->optlen = DNSOpt_Owner_Space(&m->PrimaryMAC, &intf->MAC) - 4; - } - -mDNSlocal void GrantUpdateCredit(AuthRecord *rr) - { - if (++rr->UpdateCredits >= kMaxUpdateCredits) rr->NextUpdateCredit = 0; - else rr->NextUpdateCredit = NonZeroTime(rr->NextUpdateCredit + kUpdateCreditRefreshInterval); - } - -// Note about acceleration of announcements to facilitate automatic coalescing of -// multiple independent threads of announcements into a single synchronized thread: -// The announcements in the packet may be at different stages of maturity; -// One-second interval, two-second interval, four-second interval, and so on. -// After we've put in all the announcements that are due, we then consider -// whether there are other nearly-due announcements that are worth accelerating. -// To be eligible for acceleration, a record MUST NOT be older (further along -// its timeline) than the most mature record we've already put in the packet. -// In other words, younger records can have their timelines accelerated to catch up -// with their elder bretheren; this narrows the age gap and helps them eventually get in sync. -// Older records cannot have their timelines accelerated; this would just widen -// the gap between them and their younger bretheren and get them even more out of sync. - -// Note: SendResponses calls mDNS_Deregister_internal which can call a user callback, which may change -// the record list and/or question list. -// Any code walking either list must use the CurrentQuestion and/or CurrentRecord mechanism to protect against this. -mDNSlocal void SendResponses(mDNS *const m) - { - int pktcount = 0; - AuthRecord *rr, *r2; - mDNSs32 maxExistingAnnounceInterval = 0; - const NetworkInterfaceInfo *intf = GetFirstActiveInterface(m->HostInterfaces); - - m->NextScheduledResponse = m->timenow + 0x78000000; - - if (m->SleepState == SleepState_Transferring) RetrySPSRegistrations(m); - - for (rr = m->ResourceRecords; rr; rr=rr->next) - if (rr->ImmedUnicast) - { - mDNSAddr v4 = { mDNSAddrType_IPv4, {{{0}}} }; - mDNSAddr v6 = { mDNSAddrType_IPv6, {{{0}}} }; - v4.ip.v4 = rr->v4Requester; - v6.ip.v6 = rr->v6Requester; - if (!mDNSIPv4AddressIsZero(rr->v4Requester)) SendDelayedUnicastResponse(m, &v4, rr->ImmedAnswer); - if (!mDNSIPv6AddressIsZero(rr->v6Requester)) SendDelayedUnicastResponse(m, &v6, rr->ImmedAnswer); - if (rr->ImmedUnicast) - { - LogMsg("SendResponses: ERROR: rr->ImmedUnicast still set: %s", ARDisplayString(m, rr)); - rr->ImmedUnicast = mDNSfalse; - } - } - - // *** - // *** 1. Setup: Set the SendRNow and ImmedAnswer fields to indicate which interface(s) the records need to be sent on - // *** - - // Run through our list of records, and decide which ones we're going to announce on all interfaces - for (rr = m->ResourceRecords; rr; rr=rr->next) - { - while (rr->NextUpdateCredit && m->timenow - rr->NextUpdateCredit >= 0) GrantUpdateCredit(rr); - if (TimeToAnnounceThisRecord(rr, m->timenow)) - { - if (rr->resrec.RecordType == kDNSRecordTypeDeregistering) - { - if (!rr->WakeUp.HMAC.l[0]) - { - if (rr->AnnounceCount) rr->ImmedAnswer = mDNSInterfaceMark; // Send goodbye packet on all interfaces - } - else - { - LogSPS("SendResponses: Sending wakeup %2d for %.6a %s", rr->AnnounceCount-3, &rr->WakeUp.IMAC, ARDisplayString(m, rr)); - SendWakeup(m, rr->resrec.InterfaceID, &rr->WakeUp.IMAC, &rr->WakeUp.password); - for (r2 = rr; r2; r2=r2->next) - if (r2->AnnounceCount && r2->resrec.InterfaceID == rr->resrec.InterfaceID && mDNSSameEthAddress(&r2->WakeUp.IMAC, &rr->WakeUp.IMAC)) - { - // For now we only want to send a single Unsolicited Neighbor Advertisement restoring the address to the original - // owner, because these packets can cause some IPv6 stacks to falsely conclude that there's an address conflict. - if (r2->AddressProxy.type == mDNSAddrType_IPv6 && r2->AnnounceCount == WakeupCount) - { - LogSPS("NDP Announcement %2d Releasing traffic for H-MAC %.6a I-MAC %.6a %s", - r2->AnnounceCount-3, &r2->WakeUp.HMAC, &r2->WakeUp.IMAC, ARDisplayString(m,r2)); - SendNDP(m, NDP_Adv, NDP_Override, r2, &r2->AddressProxy.ip.v6, &r2->WakeUp.IMAC, &AllHosts_v6, &AllHosts_v6_Eth); - } - r2->LastAPTime = m->timenow; - // After 15 wakeups without success (maybe host has left the network) send three goodbyes instead - if (--r2->AnnounceCount <= GoodbyeCount) r2->WakeUp.HMAC = zeroEthAddr; - } - } - } - else if (ResourceRecordIsValidAnswer(rr)) - { - if (rr->AddressProxy.type) - { - rr->AnnounceCount--; - rr->ThisAPInterval *= 2; - rr->LastAPTime = m->timenow; - if (rr->AddressProxy.type == mDNSAddrType_IPv4) - { - LogSPS("ARP Announcement %2d Capturing traffic for H-MAC %.6a I-MAC %.6a %s", - rr->AnnounceCount, &rr->WakeUp.HMAC, &rr->WakeUp.IMAC, ARDisplayString(m,rr)); - SendARP(m, 1, rr, &rr->AddressProxy.ip.v4, &zeroEthAddr, &rr->AddressProxy.ip.v4, &onesEthAddr); - } - else if (rr->AddressProxy.type == mDNSAddrType_IPv6) - { - LogSPS("NDP Announcement %2d Capturing traffic for H-MAC %.6a I-MAC %.6a %s", - rr->AnnounceCount, &rr->WakeUp.HMAC, &rr->WakeUp.IMAC, ARDisplayString(m,rr)); - SendNDP(m, NDP_Adv, NDP_Override, rr, &rr->AddressProxy.ip.v6, mDNSNULL, &AllHosts_v6, &AllHosts_v6_Eth); - } - } - else - { - rr->ImmedAnswer = mDNSInterfaceMark; // Send on all interfaces - if (maxExistingAnnounceInterval < rr->ThisAPInterval) - maxExistingAnnounceInterval = rr->ThisAPInterval; - if (rr->UpdateBlocked) rr->UpdateBlocked = 0; - } - } - } - } - - // Any interface-specific records we're going to send are marked as being sent on all appropriate interfaces (which is just one) - // Eligible records that are more than half-way to their announcement time are accelerated - for (rr = m->ResourceRecords; rr; rr=rr->next) - if ((rr->resrec.InterfaceID && rr->ImmedAnswer) || - (rr->ThisAPInterval <= maxExistingAnnounceInterval && - TimeToAnnounceThisRecord(rr, m->timenow + rr->ThisAPInterval/2) && - !rr->AddressProxy.type && // Don't include ARP Annoucements when considering which records to accelerate - ResourceRecordIsValidAnswer(rr))) - rr->ImmedAnswer = mDNSInterfaceMark; // Send on all interfaces - - // When sending SRV records (particularly when announcing a new service) automatically add related Address record(s) as additionals - // Note: Currently all address records are interface-specific, so it's safe to set ImmedAdditional to their InterfaceID, - // which will be non-null. If by some chance there is an address record that's not interface-specific (should never happen) - // then all that means is that it won't get sent -- which would not be the end of the world. - for (rr = m->ResourceRecords; rr; rr=rr->next) - { - if (rr->ImmedAnswer && rr->resrec.rrtype == kDNSType_SRV) - for (r2=m->ResourceRecords; r2; r2=r2->next) // Scan list of resource records - if (RRTypeIsAddressType(r2->resrec.rrtype) && // For all address records (A/AAAA) ... - ResourceRecordIsValidAnswer(r2) && // ... which are valid for answer ... - rr->LastMCTime - r2->LastMCTime >= 0 && // ... which we have not sent recently ... - rr->resrec.rdatahash == r2->resrec.namehash && // ... whose name is the name of the SRV target - SameDomainName(&rr->resrec.rdata->u.srv.target, r2->resrec.name) && - (rr->ImmedAnswer == mDNSInterfaceMark || rr->ImmedAnswer == r2->resrec.InterfaceID)) - r2->ImmedAdditional = r2->resrec.InterfaceID; // ... then mark this address record for sending too - // We also make sure we send the DeviceInfo TXT record too, if necessary - // We check for RecordType == kDNSRecordTypeShared because we don't want to tag the - // DeviceInfo TXT record onto a goodbye packet (RecordType == kDNSRecordTypeDeregistering). - if (rr->ImmedAnswer && rr->resrec.RecordType == kDNSRecordTypeShared && rr->resrec.rrtype == kDNSType_PTR) - if (ResourceRecordIsValidAnswer(&m->DeviceInfo) && SameDomainLabel(rr->resrec.rdata->u.name.c, m->DeviceInfo.resrec.name->c)) - { - if (!m->DeviceInfo.ImmedAnswer) m->DeviceInfo.ImmedAnswer = rr->ImmedAnswer; - else m->DeviceInfo.ImmedAnswer = mDNSInterfaceMark; - } - } - - // If there's a record which is supposed to be unique that we're going to send, then make sure that we give - // the whole RRSet as an atomic unit. That means that if we have any other records with the same name/type/class - // then we need to mark them for sending too. Otherwise, if we set the kDNSClass_UniqueRRSet bit on a - // record, then other RRSet members that have not been sent recently will get flushed out of client caches. - // -- If a record is marked to be sent on a certain interface, make sure the whole set is marked to be sent on that interface - // -- If any record is marked to be sent on all interfaces, make sure the whole set is marked to be sent on all interfaces - for (rr = m->ResourceRecords; rr; rr=rr->next) - if (rr->resrec.RecordType & kDNSRecordTypeUniqueMask) - { - if (rr->ImmedAnswer) // If we're sending this as answer, see that its whole RRSet is similarly marked - { - for (r2 = m->ResourceRecords; r2; r2=r2->next) - if (ResourceRecordIsValidAnswer(r2)) - if (r2->ImmedAnswer != mDNSInterfaceMark && - r2->ImmedAnswer != rr->ImmedAnswer && SameResourceRecordSignature(r2, rr)) - r2->ImmedAnswer = !r2->ImmedAnswer ? rr->ImmedAnswer : mDNSInterfaceMark; - } - else if (rr->ImmedAdditional) // If we're sending this as additional, see that its whole RRSet is similarly marked - { - for (r2 = m->ResourceRecords; r2; r2=r2->next) - if (ResourceRecordIsValidAnswer(r2)) - if (r2->ImmedAdditional != rr->ImmedAdditional && SameResourceRecordSignature(r2, rr)) - r2->ImmedAdditional = rr->ImmedAdditional; - } - } - - // Now set SendRNow state appropriately - for (rr = m->ResourceRecords; rr; rr=rr->next) - { - if (rr->ImmedAnswer == mDNSInterfaceMark) // Sending this record on all appropriate interfaces - { - rr->SendRNow = !intf ? mDNSNULL : (rr->resrec.InterfaceID) ? rr->resrec.InterfaceID : intf->InterfaceID; - rr->ImmedAdditional = mDNSNULL; // No need to send as additional if sending as answer - rr->LastMCTime = m->timenow; - rr->LastMCInterface = rr->ImmedAnswer; - // If we're announcing this record, and it's at least half-way to its ordained time, then consider this announcement done - if (TimeToAnnounceThisRecord(rr, m->timenow + rr->ThisAPInterval/2)) - { - rr->AnnounceCount--; - if (rr->resrec.RecordType != kDNSRecordTypeDeregistering) - rr->ThisAPInterval *= 2; - rr->LastAPTime = m->timenow; - debugf("Announcing %##s (%s) %d", rr->resrec.name->c, DNSTypeName(rr->resrec.rrtype), rr->AnnounceCount); - } - } - else if (rr->ImmedAnswer) // Else, just respond to a single query on single interface: - { - rr->SendRNow = rr->ImmedAnswer; // Just respond on that interface - rr->ImmedAdditional = mDNSNULL; // No need to send as additional too - rr->LastMCTime = m->timenow; - rr->LastMCInterface = rr->ImmedAnswer; - } - SetNextAnnounceProbeTime(m, rr); - //if (rr->SendRNow) LogMsg("%-15.4a %s", &rr->v4Requester, ARDisplayString(m, rr)); - } - - // *** - // *** 2. Loop through interface list, sending records as appropriate - // *** - - while (intf) - { - const int OwnerRecordSpace = (m->AnnounceOwner && intf->MAC.l[0]) ? DNSOpt_Header_Space + DNSOpt_Owner_Space(&m->PrimaryMAC, &intf->MAC) : 0; - int numDereg = 0; - int numAnnounce = 0; - int numAnswer = 0; - mDNSu8 *responseptr = m->omsg.data; - mDNSu8 *newptr; - InitializeDNSMessage(&m->omsg.h, zeroID, ResponseFlags); - - // First Pass. Look for: - // 1. Deregistering records that need to send their goodbye packet - // 2. Updated records that need to retract their old data - // 3. Answers and announcements we need to send - for (rr = m->ResourceRecords; rr; rr=rr->next) - { - - // Skip this interface if the record InterfaceID is *Any and the record is not - // appropriate for the interface type. - if ((rr->SendRNow == intf->InterfaceID) && - ((rr->resrec.InterfaceID == mDNSInterface_Any) && !mDNSPlatformValidRecordForInterface(rr, intf))) - { - LogInfo("SendResponses: Not Sending %s, on %s", ARDisplayString(m, rr), InterfaceNameForID(m, rr->SendRNow)); - rr->SendRNow = GetNextActiveInterfaceID(intf); - } - else if (rr->SendRNow == intf->InterfaceID) - { - RData *OldRData = rr->resrec.rdata; - mDNSu16 oldrdlength = rr->resrec.rdlength; - mDNSu8 active = (mDNSu8) - (rr->resrec.RecordType != kDNSRecordTypeDeregistering && - (m->SleepState != SleepState_Sleeping || intf->SPSAddr[0].type || intf->SPSAddr[1].type || intf->SPSAddr[2].type)); - newptr = mDNSNULL; - if (rr->NewRData && active) - { - // See if we should send a courtesy "goodbye" for the old data before we replace it. - if (ResourceRecordIsValidAnswer(rr) && rr->resrec.RecordType == kDNSRecordTypeShared && rr->RequireGoodbye) - { - newptr = PutRR_OS_TTL(responseptr, &m->omsg.h.numAnswers, &rr->resrec, 0); - if (newptr) { responseptr = newptr; numDereg++; rr->RequireGoodbye = mDNSfalse; } - else continue; // If this packet is already too full to hold the goodbye for this record, skip it for now and we'll retry later - } - SetNewRData(&rr->resrec, rr->NewRData, rr->newrdlength); - } - - if (rr->resrec.RecordType & kDNSRecordTypeUniqueMask) - rr->resrec.rrclass |= kDNSClass_UniqueRRSet; // Temporarily set the cache flush bit so PutResourceRecord will set it - newptr = PutRR_OS_TTL(responseptr, &m->omsg.h.numAnswers, &rr->resrec, active ? rr->resrec.rroriginalttl : 0); - rr->resrec.rrclass &= ~kDNSClass_UniqueRRSet; // Make sure to clear cache flush bit back to normal state - if (newptr) - { - responseptr = newptr; - rr->RequireGoodbye = active; - if (rr->resrec.RecordType == kDNSRecordTypeDeregistering) numDereg++; - else if (rr->LastAPTime == m->timenow) numAnnounce++; else numAnswer++; - } - - if (rr->NewRData && active) - SetNewRData(&rr->resrec, OldRData, oldrdlength); - - // The first time through (pktcount==0), if this record is verified unique - // (i.e. typically A, AAAA, SRV, TXT and reverse-mapping PTR), set the flag to add an NSEC too. - if (!pktcount && active && (rr->resrec.RecordType & kDNSRecordTypeActiveUniqueMask) && !rr->SendNSECNow) - rr->SendNSECNow = mDNSInterfaceMark; - - if (newptr) // If succeeded in sending, advance to next interface - { - // If sending on all interfaces, go to next interface; else we're finished now - if (rr->ImmedAnswer == mDNSInterfaceMark && rr->resrec.InterfaceID == mDNSInterface_Any) - rr->SendRNow = GetNextActiveInterfaceID(intf); - else - rr->SendRNow = mDNSNULL; - } - } - } - - // Second Pass. Add additional records, if there's space. - newptr = responseptr; - for (rr = m->ResourceRecords; rr; rr=rr->next) - if (rr->ImmedAdditional == intf->InterfaceID) - if (ResourceRecordIsValidAnswer(rr)) - { - // If we have at least one answer already in the packet, then plan to add additionals too - mDNSBool SendAdditional = (m->omsg.h.numAnswers > 0); - - // If we're not planning to send any additionals, but this record is a unique one, then - // make sure we haven't already sent any other members of its RRSet -- if we have, then they - // will have had the cache flush bit set, so now we need to finish the job and send the rest. - if (!SendAdditional && (rr->resrec.RecordType & kDNSRecordTypeUniqueMask)) - { - const AuthRecord *a; - for (a = m->ResourceRecords; a; a=a->next) - if (a->LastMCTime == m->timenow && - a->LastMCInterface == intf->InterfaceID && - SameResourceRecordSignature(a, rr)) { SendAdditional = mDNStrue; break; } - } - if (!SendAdditional) // If we don't want to send this after all, - rr->ImmedAdditional = mDNSNULL; // then cancel its ImmedAdditional field - else if (newptr) // Else, try to add it if we can - { - // The first time through (pktcount==0), if this record is verified unique - // (i.e. typically A, AAAA, SRV, TXT and reverse-mapping PTR), set the flag to add an NSEC too. - if (!pktcount && (rr->resrec.RecordType & kDNSRecordTypeActiveUniqueMask) && !rr->SendNSECNow) - rr->SendNSECNow = mDNSInterfaceMark; - - if (rr->resrec.RecordType & kDNSRecordTypeUniqueMask) - rr->resrec.rrclass |= kDNSClass_UniqueRRSet; // Temporarily set the cache flush bit so PutResourceRecord will set it - newptr = PutRR_OS(newptr, &m->omsg.h.numAdditionals, &rr->resrec); - rr->resrec.rrclass &= ~kDNSClass_UniqueRRSet; // Make sure to clear cache flush bit back to normal state - if (newptr) - { - responseptr = newptr; - rr->ImmedAdditional = mDNSNULL; - rr->RequireGoodbye = mDNStrue; - // If we successfully put this additional record in the packet, we record LastMCTime & LastMCInterface. - // This matters particularly in the case where we have more than one IPv6 (or IPv4) address, because otherwise, - // when we see our own multicast with the cache flush bit set, if we haven't set LastMCTime, then we'll get - // all concerned and re-announce our record again to make sure it doesn't get flushed from peer caches. - rr->LastMCTime = m->timenow; - rr->LastMCInterface = intf->InterfaceID; - } - } - } - - // Third Pass. Add NSEC records, if there's space. - // When we're generating an NSEC record in response to a specify query for that type - // (recognized by rr->SendNSECNow == intf->InterfaceID) we should really put the NSEC in the Answer Section, - // not Additional Section, but for now it's easier to handle both cases in this Additional Section loop here. - for (rr = m->ResourceRecords; rr; rr=rr->next) - if (rr->SendNSECNow == mDNSInterfaceMark || rr->SendNSECNow == intf->InterfaceID) - { - AuthRecord nsec; - mDNS_SetupResourceRecord(&nsec, mDNSNULL, mDNSInterface_Any, kDNSType_NSEC, rr->resrec.rroriginalttl, kDNSRecordTypeUnique, AuthRecordAny, mDNSNULL, mDNSNULL); - nsec.resrec.rrclass |= kDNSClass_UniqueRRSet; - AssignDomainName(&nsec.namestorage, rr->resrec.name); - mDNSPlatformMemZero(nsec.rdatastorage.u.nsec.bitmap, sizeof(nsec.rdatastorage.u.nsec.bitmap)); - for (r2 = m->ResourceRecords; r2; r2=r2->next) - if (ResourceRecordIsValidAnswer(r2) && SameResourceRecordNameClassInterface(r2, rr)) - { - if (r2->resrec.rrtype >= kDNSQType_ANY) { LogMsg("Can't create NSEC for record %s", ARDisplayString(m, r2)); break; } - else nsec.rdatastorage.u.nsec.bitmap[r2->resrec.rrtype >> 3] |= 128 >> (r2->resrec.rrtype & 7); - } - newptr = responseptr; - if (!r2) // If we successfully built our NSEC record, add it to the packet now - { - newptr = PutRR_OS(responseptr, &m->omsg.h.numAdditionals, &nsec.resrec); - if (newptr) responseptr = newptr; - } - - // If we successfully put the NSEC record, clear the SendNSECNow flag - // If we consider this NSEC optional, then we unconditionally clear the SendNSECNow flag, even if we fail to put this additional record - if (newptr || rr->SendNSECNow == mDNSInterfaceMark) - { - rr->SendNSECNow = mDNSNULL; - // Run through remainder of list clearing SendNSECNow flag for all other records which would generate the same NSEC - for (r2 = rr->next; r2; r2=r2->next) - if (SameResourceRecordNameClassInterface(r2, rr)) - if (r2->SendNSECNow == mDNSInterfaceMark || r2->SendNSECNow == intf->InterfaceID) - r2->SendNSECNow = mDNSNULL; - } - } - - if (m->omsg.h.numAnswers || m->omsg.h.numAdditionals) - { - // If we have data to send, add OWNER option if necessary, then send packet - - if (OwnerRecordSpace) - { - AuthRecord opt; - mDNS_SetupResourceRecord(&opt, mDNSNULL, mDNSInterface_Any, kDNSType_OPT, kStandardTTL, kDNSRecordTypeKnownUnique, AuthRecordAny, mDNSNULL, mDNSNULL); - opt.resrec.rrclass = NormalMaxDNSMessageData; - opt.resrec.rdlength = sizeof(rdataOPT); // One option in this OPT record - opt.resrec.rdestimate = sizeof(rdataOPT); - SetupOwnerOpt(m, intf, &opt.resrec.rdata->u.opt[0]); - newptr = PutResourceRecord(&m->omsg, responseptr, &m->omsg.h.numAdditionals, &opt.resrec); - if (newptr) { responseptr = newptr; LogSPS("SendResponses put %s", ARDisplayString(m, &opt)); } - else if (m->omsg.h.numAnswers + m->omsg.h.numAuthorities + m->omsg.h.numAdditionals == 1) - LogSPS("SendResponses: No space in packet for Owner OPT record (%d/%d/%d/%d) %s", - m->omsg.h.numQuestions, m->omsg.h.numAnswers, m->omsg.h.numAuthorities, m->omsg.h.numAdditionals, ARDisplayString(m, &opt)); - else - LogMsg("SendResponses: How did we fail to have space for Owner OPT record (%d/%d/%d/%d) %s", - m->omsg.h.numQuestions, m->omsg.h.numAnswers, m->omsg.h.numAuthorities, m->omsg.h.numAdditionals, ARDisplayString(m, &opt)); - } - - debugf("SendResponses: Sending %d Deregistration%s, %d Announcement%s, %d Answer%s, %d Additional%s on %p", - numDereg, numDereg == 1 ? "" : "s", - numAnnounce, numAnnounce == 1 ? "" : "s", - numAnswer, numAnswer == 1 ? "" : "s", - m->omsg.h.numAdditionals, m->omsg.h.numAdditionals == 1 ? "" : "s", intf->InterfaceID); - - if (intf->IPv4Available) mDNSSendDNSMessage(m, &m->omsg, responseptr, intf->InterfaceID, mDNSNULL, &AllDNSLinkGroup_v4, MulticastDNSPort, mDNSNULL, mDNSNULL); - if (intf->IPv6Available) mDNSSendDNSMessage(m, &m->omsg, responseptr, intf->InterfaceID, mDNSNULL, &AllDNSLinkGroup_v6, MulticastDNSPort, mDNSNULL, mDNSNULL); - if (!m->SuppressSending) m->SuppressSending = NonZeroTime(m->timenow + (mDNSPlatformOneSecond+9)/10); - if (++pktcount >= 1000) { LogMsg("SendResponses exceeded loop limit %d: giving up", pktcount); break; } - // There might be more things to send on this interface, so go around one more time and try again. - } - else // Nothing more to send on this interface; go to next - { - const NetworkInterfaceInfo *next = GetFirstActiveInterface(intf->next); - #if MDNS_DEBUGMSGS && 0 - const char *const msg = next ? "SendResponses: Nothing more on %p; moving to %p" : "SendResponses: Nothing more on %p"; - debugf(msg, intf, next); - #endif - intf = next; - pktcount = 0; // When we move to a new interface, reset packet count back to zero -- NSEC generation logic uses it - } - } - - // *** - // *** 3. Cleanup: Now that everything is sent, call client callback functions, and reset state variables - // *** - - if (m->CurrentRecord) - LogMsg("SendResponses ERROR m->CurrentRecord already set %s", ARDisplayString(m, m->CurrentRecord)); - m->CurrentRecord = m->ResourceRecords; - while (m->CurrentRecord) - { - rr = m->CurrentRecord; - m->CurrentRecord = rr->next; - - if (rr->SendRNow) - { - if (rr->ARType != AuthRecordLocalOnly && rr->ARType != AuthRecordP2P) - LogMsg("SendResponses: No active interface %p to send: %p %02X %s", rr->SendRNow, rr->resrec.InterfaceID, rr->resrec.RecordType, ARDisplayString(m, rr)); - rr->SendRNow = mDNSNULL; - } - - if (rr->ImmedAnswer || rr->resrec.RecordType == kDNSRecordTypeDeregistering) - { - if (rr->NewRData) CompleteRDataUpdate(m, rr); // Update our rdata, clear the NewRData pointer, and return memory to the client - - if (rr->resrec.RecordType == kDNSRecordTypeDeregistering && rr->AnnounceCount == 0) - { - // For Unicast, when we get the response from the server, we will call CompleteDeregistration - if (!AuthRecord_uDNS(rr)) CompleteDeregistration(m, rr); // Don't touch rr after this - } - else - { - rr->ImmedAnswer = mDNSNULL; - rr->ImmedUnicast = mDNSfalse; - rr->v4Requester = zerov4Addr; - rr->v6Requester = zerov6Addr; - } - } - } - verbosedebugf("SendResponses: Next in %ld ticks", m->NextScheduledResponse - m->timenow); - } - -// Calling CheckCacheExpiration() is an expensive operation because it has to look at the entire cache, -// so we want to be lazy about how frequently we do it. -// 1. If a cache record is currently referenced by *no* active questions, -// then we don't mind expiring it up to a minute late (who will know?) -// 2. Else, if a cache record is due for some of its final expiration queries, -// we'll allow them to be late by up to 2% of the TTL -// 3. Else, if a cache record has completed all its final expiration queries without success, -// and is expiring, and had an original TTL more than ten seconds, we'll allow it to be one second late -// 4. Else, it is expiring and had an original TTL of ten seconds or less (includes explicit goodbye packets), -// so allow at most 1/10 second lateness -// 5. For records with rroriginalttl set to zero, that means we really want to delete them immediately -// (we have a new record with DelayDelivery set, waiting for the old record to go away before we can notify clients). -#define CacheCheckGracePeriod(RR) ( \ - ((RR)->CRActiveQuestion == mDNSNULL ) ? (60 * mDNSPlatformOneSecond) : \ - ((RR)->UnansweredQueries < MaxUnansweredQueries) ? (TicksTTL(rr)/50) : \ - ((RR)->resrec.rroriginalttl > 10 ) ? (mDNSPlatformOneSecond) : \ - ((RR)->resrec.rroriginalttl > 0 ) ? (mDNSPlatformOneSecond/10) : 0) - -#define NextCacheCheckEvent(RR) ((RR)->NextRequiredQuery + CacheCheckGracePeriod(RR)) - -mDNSexport void ScheduleNextCacheCheckTime(mDNS *const m, const mDNSu32 slot, const mDNSs32 event) - { - if (m->rrcache_nextcheck[slot] - event > 0) - m->rrcache_nextcheck[slot] = event; - if (m->NextCacheCheck - event > 0) - m->NextCacheCheck = event; - } - -// Note: MUST call SetNextCacheCheckTimeForRecord any time we change: -// rr->TimeRcvd -// rr->resrec.rroriginalttl -// rr->UnansweredQueries -// rr->CRActiveQuestion -mDNSlocal void SetNextCacheCheckTimeForRecord(mDNS *const m, CacheRecord *const rr) - { - rr->NextRequiredQuery = RRExpireTime(rr); - - // If we have an active question, then see if we want to schedule a refresher query for this record. - // Usually we expect to do four queries, at 80-82%, 85-87%, 90-92% and then 95-97% of the TTL. - if (rr->CRActiveQuestion && rr->UnansweredQueries < MaxUnansweredQueries) - { - rr->NextRequiredQuery -= TicksTTL(rr)/20 * (MaxUnansweredQueries - rr->UnansweredQueries); - rr->NextRequiredQuery += mDNSRandom((mDNSu32)TicksTTL(rr)/50); - verbosedebugf("SetNextCacheCheckTimeForRecord: NextRequiredQuery in %ld sec CacheCheckGracePeriod %d ticks for %s", - (rr->NextRequiredQuery - m->timenow) / mDNSPlatformOneSecond, CacheCheckGracePeriod(rr), CRDisplayString(m,rr)); - } - - ScheduleNextCacheCheckTime(m, HashSlot(rr->resrec.name), NextCacheCheckEvent(rr)); - } - -#define kMinimumReconfirmTime ((mDNSu32)mDNSPlatformOneSecond * 5) -#define kDefaultReconfirmTimeForWake ((mDNSu32)mDNSPlatformOneSecond * 5) -#define kDefaultReconfirmTimeForNoAnswer ((mDNSu32)mDNSPlatformOneSecond * 5) -#define kDefaultReconfirmTimeForFlappingInterface ((mDNSu32)mDNSPlatformOneSecond * 30) - -mDNSlocal mStatus mDNS_Reconfirm_internal(mDNS *const m, CacheRecord *const rr, mDNSu32 interval) - { - if (interval < kMinimumReconfirmTime) - interval = kMinimumReconfirmTime; - if (interval > 0x10000000) // Make sure interval doesn't overflow when we multiply by four below - interval = 0x10000000; - - // If the expected expiration time for this record is more than interval+33%, then accelerate its expiration - if (RRExpireTime(rr) - m->timenow > (mDNSs32)((interval * 4) / 3)) - { - // Add a 33% random amount to the interval, to avoid synchronization between multiple hosts - // For all the reconfirmations in a given batch, we want to use the same random value - // so that the reconfirmation questions can be grouped into a single query packet - if (!m->RandomReconfirmDelay) m->RandomReconfirmDelay = 1 + mDNSRandom(0x3FFFFFFF); - interval += m->RandomReconfirmDelay % ((interval/3) + 1); - rr->TimeRcvd = m->timenow - (mDNSs32)interval * 3; - rr->resrec.rroriginalttl = (interval * 4 + mDNSPlatformOneSecond - 1) / mDNSPlatformOneSecond; - SetNextCacheCheckTimeForRecord(m, rr); - } - debugf("mDNS_Reconfirm_internal:%6ld ticks to go for %s %p", - RRExpireTime(rr) - m->timenow, CRDisplayString(m, rr), rr->CRActiveQuestion); - return(mStatus_NoError); - } - -#define MaxQuestionInterval (3600 * mDNSPlatformOneSecond) - -// BuildQuestion puts a question into a DNS Query packet and if successful, updates the value of queryptr. -// It also appends to the list of known answer records that need to be included, -// and updates the forcast for the size of the known answer section. -mDNSlocal mDNSBool BuildQuestion(mDNS *const m, DNSMessage *query, mDNSu8 **queryptr, DNSQuestion *q, - CacheRecord ***kalistptrptr, mDNSu32 *answerforecast) - { - mDNSBool ucast = (q->LargeAnswers || q->RequestUnicast) && m->CanReceiveUnicastOn5353; - mDNSu16 ucbit = (mDNSu16)(ucast ? kDNSQClass_UnicastResponse : 0); - const mDNSu8 *const limit = query->data + NormalMaxDNSMessageData; - mDNSu8 *newptr = putQuestion(query, *queryptr, limit - *answerforecast, &q->qname, q->qtype, (mDNSu16)(q->qclass | ucbit)); - if (!newptr) - { - debugf("BuildQuestion: No more space in this packet for question %##s (%s)", q->qname.c, DNSTypeName(q->qtype)); - return(mDNSfalse); - } - else - { - mDNSu32 forecast = *answerforecast; - const mDNSu32 slot = HashSlot(&q->qname); - const CacheGroup *const cg = CacheGroupForName(m, slot, q->qnamehash, &q->qname); - CacheRecord *rr; - CacheRecord **ka = *kalistptrptr; // Make a working copy of the pointer we're going to update - - for (rr = cg ? cg->members : mDNSNULL; rr; rr=rr->next) // If we have a resource record in our cache, - if (rr->resrec.InterfaceID == q->SendQNow && // received on this interface - !(rr->resrec.RecordType & kDNSRecordTypeUniqueMask) && // which is a shared (i.e. not unique) record type - rr->NextInKAList == mDNSNULL && ka != &rr->NextInKAList && // which is not already in the known answer list - rr->resrec.rdlength <= SmallRecordLimit && // which is small enough to sensibly fit in the packet - SameNameRecordAnswersQuestion(&rr->resrec, q) && // which answers our question - rr->TimeRcvd + TicksTTL(rr)/2 - m->timenow > // and its half-way-to-expiry time is at least 1 second away - mDNSPlatformOneSecond) // (also ensures we never include goodbye records with TTL=1) - { - // We don't want to include unique records in the Known Answer section. The Known Answer section - // is intended to suppress floods of shared-record replies from many other devices on the network. - // That concept really does not apply to unique records, and indeed if we do send a query for - // which we have a unique record already in our cache, then including that unique record as a - // Known Answer, so as to suppress the only answer we were expecting to get, makes little sense. - - *ka = rr; // Link this record into our known answer chain - ka = &rr->NextInKAList; - // We forecast: compressed name (2) type (2) class (2) TTL (4) rdlength (2) rdata (n) - forecast += 12 + rr->resrec.rdestimate; - // If we're trying to put more than one question in this packet, and it doesn't fit - // then undo that last question and try again next time - if (query->h.numQuestions > 1 && newptr + forecast >= limit) - { - debugf("BuildQuestion: Retracting question %##s (%s) new forecast total %d", - q->qname.c, DNSTypeName(q->qtype), newptr + forecast - query->data); - query->h.numQuestions--; - ka = *kalistptrptr; // Go back to where we started and retract these answer records - while (*ka) { CacheRecord *c = *ka; *ka = mDNSNULL; ka = &c->NextInKAList; } - return(mDNSfalse); // Return false, so we'll try again in the next packet - } - } - - // Success! Update our state pointers, increment UnansweredQueries as appropriate, and return - *queryptr = newptr; // Update the packet pointer - *answerforecast = forecast; // Update the forecast - *kalistptrptr = ka; // Update the known answer list pointer - if (ucast) q->ExpectUnicastResp = NonZeroTime(m->timenow); - - for (rr = cg ? cg->members : mDNSNULL; rr; rr=rr->next) // For every resource record in our cache, - if (rr->resrec.InterfaceID == q->SendQNow && // received on this interface - rr->NextInKAList == mDNSNULL && ka != &rr->NextInKAList && // which is not in the known answer list - SameNameRecordAnswersQuestion(&rr->resrec, q)) // which answers our question - { - rr->UnansweredQueries++; // indicate that we're expecting a response - rr->LastUnansweredTime = m->timenow; - SetNextCacheCheckTimeForRecord(m, rr); - } - - return(mDNStrue); - } - } - -// When we have a query looking for a specified name, but there appear to be no answers with -// that name, ReconfirmAntecedents() is called with depth=0 to start the reconfirmation process -// for any records in our cache that reference the given name (e.g. PTR and SRV records). -// For any such cache record we find, we also recursively call ReconfirmAntecedents() for *its* name. -// We increment depth each time we recurse, to guard against possible infinite loops, with a limit of 5. -// A typical reconfirmation scenario might go like this: -// Depth 0: Name "myhost.local" has no address records -// Depth 1: SRV "My Service._example._tcp.local." refers to "myhost.local"; may be stale -// Depth 2: PTR "_example._tcp.local." refers to "My Service"; may be stale -// Depth 3: PTR "_services._dns-sd._udp.local." refers to "_example._tcp.local."; may be stale -// Currently depths 4 and 5 are not expected to occur; if we did get to depth 5 we'd reconfim any records we -// found referring to the given name, but not recursively descend any further reconfirm *their* antecedents. -mDNSlocal void ReconfirmAntecedents(mDNS *const m, const domainname *const name, const mDNSu32 namehash, const int depth) - { - mDNSu32 slot; - CacheGroup *cg; - CacheRecord *cr; - debugf("ReconfirmAntecedents (depth=%d) for %##s", depth, name->c); - FORALL_CACHERECORDS(slot, cg, cr) - { - domainname *crtarget = GetRRDomainNameTarget(&cr->resrec); - if (crtarget && cr->resrec.rdatahash == namehash && SameDomainName(crtarget, name)) - { - LogInfo("ReconfirmAntecedents: Reconfirming (depth=%d) %s", depth, CRDisplayString(m, cr)); - mDNS_Reconfirm_internal(m, cr, kDefaultReconfirmTimeForNoAnswer); - if (depth < 5) ReconfirmAntecedents(m, cr->resrec.name, cr->resrec.namehash, depth+1); - } - } - } - -// If we get no answer for a AAAA query, then before doing an automatic implicit ReconfirmAntecedents -// we check if we have an address record for the same name. If we do have an IPv4 address for a given -// name but not an IPv6 address, that's okay (it just means the device doesn't do IPv6) so the failure -// to get a AAAA response is not grounds to doubt the PTR/SRV chain that lead us to that name. -mDNSlocal const CacheRecord *CacheHasAddressTypeForName(mDNS *const m, const domainname *const name, const mDNSu32 namehash) - { - CacheGroup *const cg = CacheGroupForName(m, HashSlot(name), namehash, name); - const CacheRecord *cr = cg ? cg->members : mDNSNULL; - while (cr && !RRTypeIsAddressType(cr->resrec.rrtype)) cr=cr->next; - return(cr); - } - -mDNSlocal const CacheRecord *FindSPSInCache1(mDNS *const m, const DNSQuestion *const q, const CacheRecord *const c0, const CacheRecord *const c1) - { - CacheGroup *const cg = CacheGroupForName(m, HashSlot(&q->qname), q->qnamehash, &q->qname); - const CacheRecord *cr, *bestcr = mDNSNULL; - mDNSu32 bestmetric = 1000000; - for (cr = cg ? cg->members : mDNSNULL; cr; cr=cr->next) - if (cr->resrec.rrtype == kDNSType_PTR && cr->resrec.rdlength >= 6) // If record is PTR type, with long enough name, - if (cr != c0 && cr != c1) // that's not one we've seen before, - if (SameNameRecordAnswersQuestion(&cr->resrec, q)) // and answers our browse query, - if (!IdenticalSameNameRecord(&cr->resrec, &m->SPSRecords.RR_PTR.resrec)) // and is not our own advertised service... - { - mDNSu32 metric = SPSMetric(cr->resrec.rdata->u.name.c); - if (bestmetric > metric) { bestmetric = metric; bestcr = cr; } - } - return(bestcr); - } - -// Finds the three best Sleep Proxies we currently have in our cache -mDNSexport void FindSPSInCache(mDNS *const m, const DNSQuestion *const q, const CacheRecord *sps[3]) - { - sps[0] = FindSPSInCache1(m, q, mDNSNULL, mDNSNULL); - sps[1] = !sps[0] ? mDNSNULL : FindSPSInCache1(m, q, sps[0], mDNSNULL); - sps[2] = !sps[1] ? mDNSNULL : FindSPSInCache1(m, q, sps[0], sps[1]); - } - -// Only DupSuppressInfos newer than the specified 'time' are allowed to remain active -mDNSlocal void ExpireDupSuppressInfo(DupSuppressInfo ds[DupSuppressInfoSize], mDNSs32 time) - { - int i; - for (i=0; iIPv4Available; // If this interface doesn't do v4, we don't need to find a v4 duplicate of this query - mDNSBool v6 = !intf->IPv6Available; // If this interface doesn't do v6, we don't need to find a v6 duplicate of this query - for (i=0; iInterfaceID) - { - if (ds[i].Type == mDNSAddrType_IPv4) v4 = mDNStrue; - else if (ds[i].Type == mDNSAddrType_IPv6) v6 = mDNStrue; - if (v4 && v6) return(mDNStrue); - } - return(mDNSfalse); - } - -mDNSlocal int RecordDupSuppressInfo(DupSuppressInfo ds[DupSuppressInfoSize], mDNSs32 Time, mDNSInterfaceID InterfaceID, mDNSs32 Type) - { - int i, j; - - // See if we have this one in our list somewhere already - for (i=0; i= DupSuppressInfoSize) - { - i = 0; - for (j=1; jInterfaceID; - domainname *d = &q->qname; - - // We can't send magic packets without knowing which interface to send it on. - if (InterfaceID == mDNSInterface_Any || InterfaceID == mDNSInterface_LocalOnly || InterfaceID == mDNSInterface_P2P) - { - LogMsg("mDNSSendWakeOnResolve: ERROR!! Invalid InterfaceID %p for question %##s", InterfaceID, q->qname.c); - return; - } - - // Split MAC@IPAddress and pass them separately - len = d->c[0]; - i = 1; - cnt = 0; - for (i = 1; i < len; i++) - { - if (d->c[i] == '@') - { - char EthAddr[18]; // ethernet adddress : 12 bytes + 5 ":" + 1 NULL byte - char IPAddr[47]; // Max IP address len: 46 bytes (IPv6) + 1 NULL byte - if (cnt != 5) - { - LogMsg("mDNSSendWakeOnResolve: ERROR!! Malformed Ethernet address %##s, cnt %d", q->qname.c, cnt); - return; - } - if ((i - 1) > (int) (sizeof(EthAddr) - 1)) - { - LogMsg("mDNSSendWakeOnResolve: ERROR!! Malformed Ethernet address %##s, length %d", q->qname.c, i - 1); - return; - } - if ((len - i) > (int)(sizeof(IPAddr) - 1)) - { - LogMsg("mDNSSendWakeOnResolve: ERROR!! Malformed IP address %##s, length %d", q->qname.c, len - i); - return; - } - mDNSPlatformMemCopy(EthAddr, &d->c[1], i - 1); - EthAddr[i - 1] = 0; - mDNSPlatformMemCopy(IPAddr, &d->c[i + 1], len - i); - IPAddr[len - i] = 0; - mDNSPlatformSendWakeupPacket(m, InterfaceID, EthAddr, IPAddr, InitialWakeOnResolveCount - q->WakeOnResolveCount); - return; - } - else if (d->c[i] == ':') - cnt++; - } - LogMsg("mDNSSendWakeOnResolve: ERROR!! Malformed WakeOnResolve name %##s", q->qname.c); - } - - -mDNSlocal mDNSBool AccelerateThisQuery(mDNS *const m, DNSQuestion *q) - { - // If more than 90% of the way to the query time, we should unconditionally accelerate it - if (TimeToSendThisQuestion(q, m->timenow + q->ThisQInterval/10)) - return(mDNStrue); - - // If half-way to next scheduled query time, only accelerate if it will add less than 512 bytes to the packet - if (TimeToSendThisQuestion(q, m->timenow + q->ThisQInterval/2)) - { - // We forecast: qname (n) type (2) class (2) - mDNSu32 forecast = (mDNSu32)DomainNameLength(&q->qname) + 4; - const mDNSu32 slot = HashSlot(&q->qname); - const CacheGroup *const cg = CacheGroupForName(m, slot, q->qnamehash, &q->qname); - const CacheRecord *rr; - for (rr = cg ? cg->members : mDNSNULL; rr; rr=rr->next) // If we have a resource record in our cache, - if (rr->resrec.rdlength <= SmallRecordLimit && // which is small enough to sensibly fit in the packet - SameNameRecordAnswersQuestion(&rr->resrec, q) && // which answers our question - rr->TimeRcvd + TicksTTL(rr)/2 - m->timenow >= 0 && // and it is less than half-way to expiry - rr->NextRequiredQuery - (m->timenow + q->ThisQInterval) > 0)// and we'll ask at least once again before NextRequiredQuery - { - // We forecast: compressed name (2) type (2) class (2) TTL (4) rdlength (2) rdata (n) - forecast += 12 + rr->resrec.rdestimate; - if (forecast >= 512) return(mDNSfalse); // If this would add 512 bytes or more to the packet, don't accelerate - } - return(mDNStrue); - } - - return(mDNSfalse); - } - -// How Standard Queries are generated: -// 1. The Question Section contains the question -// 2. The Additional Section contains answers we already know, to suppress duplicate responses - -// How Probe Queries are generated: -// 1. The Question Section contains queries for the name we intend to use, with QType=ANY because -// if some other host is already using *any* records with this name, we want to know about it. -// 2. The Authority Section contains the proposed values we intend to use for one or more -// of our records with that name (analogous to the Update section of DNS Update packets) -// because if some other host is probing at the same time, we each want to know what the other is -// planning, in order to apply the tie-breaking rule to see who gets to use the name and who doesn't. - -mDNSlocal void SendQueries(mDNS *const m) - { - mDNSu32 slot; - CacheGroup *cg; - CacheRecord *cr; - AuthRecord *ar; - int pktcount = 0; - DNSQuestion *q; - // For explanation of maxExistingQuestionInterval logic, see comments for maxExistingAnnounceInterval - mDNSs32 maxExistingQuestionInterval = 0; - const NetworkInterfaceInfo *intf = GetFirstActiveInterface(m->HostInterfaces); - CacheRecord *KnownAnswerList = mDNSNULL; - - // 1. If time for a query, work out what we need to do - - // We're expecting to send a query anyway, so see if any expiring cache records are close enough - // to their NextRequiredQuery to be worth batching them together with this one - FORALL_CACHERECORDS(slot, cg, cr) - if (cr->CRActiveQuestion && cr->UnansweredQueries < MaxUnansweredQueries) - if (m->timenow + TicksTTL(cr)/50 - cr->NextRequiredQuery >= 0) - { - debugf("Sending %d%% cache expiration query for %s", 80 + 5 * cr->UnansweredQueries, CRDisplayString(m, cr)); - q = cr->CRActiveQuestion; - ExpireDupSuppressInfoOnInterface(q->DupSuppress, m->timenow - TicksTTL(cr)/20, cr->resrec.InterfaceID); - // For uDNS queries (TargetQID non-zero) we adjust LastQTime, - // and bump UnansweredQueries so that we don't spin trying to send the same cache expiration query repeatedly - if (q->Target.type) q->SendQNow = mDNSInterfaceMark; // If targeted query, mark it - else if (!mDNSOpaque16IsZero(q->TargetQID)) { q->LastQTime = m->timenow - q->ThisQInterval; cr->UnansweredQueries++; } - else if (q->SendQNow == mDNSNULL) q->SendQNow = cr->resrec.InterfaceID; - else if (q->SendQNow != cr->resrec.InterfaceID) q->SendQNow = mDNSInterfaceMark; - } - - // Scan our list of questions to see which: - // *WideArea* queries need to be sent - // *unicast* queries need to be sent - // *multicast* queries we're definitely going to send - if (m->CurrentQuestion) - LogMsg("SendQueries ERROR m->CurrentQuestion already set: %##s (%s)", m->CurrentQuestion->qname.c, DNSTypeName(m->CurrentQuestion->qtype)); - m->CurrentQuestion = m->Questions; - while (m->CurrentQuestion && m->CurrentQuestion != m->NewQuestions) - { - q = m->CurrentQuestion; - if (q->Target.type && (q->SendQNow || TimeToSendThisQuestion(q, m->timenow))) - { - mDNSu8 *qptr = m->omsg.data; - const mDNSu8 *const limit = m->omsg.data + sizeof(m->omsg.data); - - // If we fail to get a new on-demand socket (should only happen cases of the most extreme resource exhaustion), we'll try again next time - if (!q->LocalSocket) q->LocalSocket = mDNSPlatformUDPSocket(m, zeroIPPort); - if (q->LocalSocket) - { - InitializeDNSMessage(&m->omsg.h, q->TargetQID, QueryFlags); - qptr = putQuestion(&m->omsg, qptr, limit, &q->qname, q->qtype, q->qclass); - mDNSSendDNSMessage(m, &m->omsg, qptr, mDNSInterface_Any, q->LocalSocket, &q->Target, q->TargetPort, mDNSNULL, mDNSNULL); - q->ThisQInterval *= QuestionIntervalStep; - } - if (q->ThisQInterval > MaxQuestionInterval) - q->ThisQInterval = MaxQuestionInterval; - q->LastQTime = m->timenow; - q->LastQTxTime = m->timenow; - q->RecentAnswerPkts = 0; - q->SendQNow = mDNSNULL; - q->ExpectUnicastResp = NonZeroTime(m->timenow); - } - else if (mDNSOpaque16IsZero(q->TargetQID) && !q->Target.type && TimeToSendThisQuestion(q, m->timenow)) - { - //LogInfo("Time to send %##s (%s) %d", q->qname.c, DNSTypeName(q->qtype), m->timenow - NextQSendTime(q)); - q->SendQNow = mDNSInterfaceMark; // Mark this question for sending on all interfaces - if (maxExistingQuestionInterval < q->ThisQInterval) - maxExistingQuestionInterval = q->ThisQInterval; - } - // If m->CurrentQuestion wasn't modified out from under us, advance it now - // We can't do this at the start of the loop because uDNS_CheckCurrentQuestion() depends on having - // m->CurrentQuestion point to the right question - if (q == m->CurrentQuestion) m->CurrentQuestion = m->CurrentQuestion->next; - } - while (m->CurrentQuestion) - { - LogInfo("SendQueries question loop 1: Skipping NewQuestion %##s (%s)", m->CurrentQuestion->qname.c, DNSTypeName(m->CurrentQuestion->qtype)); - m->CurrentQuestion = m->CurrentQuestion->next; - } - m->CurrentQuestion = mDNSNULL; - - // Scan our list of questions - // (a) to see if there are any more that are worth accelerating, and - // (b) to update the state variables for *all* the questions we're going to send - // Note: Don't set NextScheduledQuery until here, because uDNS_CheckCurrentQuestion in the loop above can add new questions to the list, - // which causes NextScheduledQuery to get (incorrectly) set to m->timenow. Setting it here is the right place, because the very - // next thing we do is scan the list and call SetNextQueryTime() for every question we find, so we know we end up with the right value. - m->NextScheduledQuery = m->timenow + 0x78000000; - for (q = m->Questions; q && q != m->NewQuestions; q=q->next) - { - if (mDNSOpaque16IsZero(q->TargetQID) && (q->SendQNow || - (!q->Target.type && ActiveQuestion(q) && q->ThisQInterval <= maxExistingQuestionInterval && AccelerateThisQuery(m,q)))) - { - // If at least halfway to next query time, advance to next interval - // If less than halfway to next query time, then - // treat this as logically a repeat of the last transmission, without advancing the interval - if (m->timenow - (q->LastQTime + (q->ThisQInterval/2)) >= 0) - { - //LogInfo("Accelerating %##s (%s) %d", q->qname.c, DNSTypeName(q->qtype), m->timenow - NextQSendTime(q)); - q->SendQNow = mDNSInterfaceMark; // Mark this question for sending on all interfaces - debugf("SendQueries: %##s (%s) next interval %d seconds RequestUnicast = %d", - q->qname.c, DNSTypeName(q->qtype), q->ThisQInterval / InitialQuestionInterval, q->RequestUnicast); - q->ThisQInterval *= QuestionIntervalStep; - if (q->ThisQInterval > MaxQuestionInterval) - q->ThisQInterval = MaxQuestionInterval; - else if (q->CurrentAnswers == 0 && q->ThisQInterval == InitialQuestionInterval * QuestionIntervalStep3 && !q->RequestUnicast && - !(RRTypeIsAddressType(q->qtype) && CacheHasAddressTypeForName(m, &q->qname, q->qnamehash))) - { - // Generally don't need to log this. - // It's not especially noteworthy if a query finds no results -- this usually happens for domain - // enumeration queries in the LL subdomain (e.g. "db._dns-sd._udp.0.0.254.169.in-addr.arpa") - // and when there simply happen to be no instances of the service the client is looking - // for (e.g. iTunes is set to look for RAOP devices, and the current network has none). - debugf("SendQueries: Zero current answers for %##s (%s); will reconfirm antecedents", - q->qname.c, DNSTypeName(q->qtype)); - // Sending third query, and no answers yet; time to begin doubting the source - ReconfirmAntecedents(m, &q->qname, q->qnamehash, 0); - } - } - - // Mark for sending. (If no active interfaces, then don't even try.) - q->SendOnAll = (q->SendQNow == mDNSInterfaceMark); - if (q->SendOnAll) - { - q->SendQNow = !intf ? mDNSNULL : (q->InterfaceID) ? q->InterfaceID : intf->InterfaceID; - q->LastQTime = m->timenow; - } - - // If we recorded a duplicate suppression for this question less than half an interval ago, - // then we consider it recent enough that we don't need to do an identical query ourselves. - ExpireDupSuppressInfo(q->DupSuppress, m->timenow - q->ThisQInterval/2); - - q->LastQTxTime = m->timenow; - q->RecentAnswerPkts = 0; - if (q->RequestUnicast) q->RequestUnicast--; - } - // For all questions (not just the ones we're sending) check what the next scheduled event will be - // We don't need to consider NewQuestions here because for those we'll set m->NextScheduledQuery in AnswerNewQuestion - SetNextQueryTime(m,q); - } - - // 2. Scan our authoritative RR list to see what probes we might need to send - - m->NextScheduledProbe = m->timenow + 0x78000000; - - if (m->CurrentRecord) - LogMsg("SendQueries ERROR m->CurrentRecord already set %s", ARDisplayString(m, m->CurrentRecord)); - m->CurrentRecord = m->ResourceRecords; - while (m->CurrentRecord) - { - ar = m->CurrentRecord; - m->CurrentRecord = ar->next; - if (!AuthRecord_uDNS(ar) && ar->resrec.RecordType == kDNSRecordTypeUnique) // For all records that are still probing... - { - // 1. If it's not reached its probe time, just make sure we update m->NextScheduledProbe correctly - if (m->timenow - (ar->LastAPTime + ar->ThisAPInterval) < 0) - { - SetNextAnnounceProbeTime(m, ar); - } - // 2. else, if it has reached its probe time, mark it for sending and then update m->NextScheduledProbe correctly - else if (ar->ProbeCount) - { - if (ar->AddressProxy.type == mDNSAddrType_IPv4) - { - LogSPS("SendQueries ARP Probe %d %s %s", ar->ProbeCount, InterfaceNameForID(m, ar->resrec.InterfaceID), ARDisplayString(m,ar)); - SendARP(m, 1, ar, &zerov4Addr, &zeroEthAddr, &ar->AddressProxy.ip.v4, &ar->WakeUp.IMAC); - } - else if (ar->AddressProxy.type == mDNSAddrType_IPv6) - { - LogSPS("SendQueries NDP Probe %d %s %s", ar->ProbeCount, InterfaceNameForID(m, ar->resrec.InterfaceID), ARDisplayString(m,ar)); - // IPv6 source = zero - // No target hardware address - // IPv6 target address is address we're probing - // Ethernet destination address is Ethernet interface address of the Sleep Proxy client we're probing - SendNDP(m, NDP_Sol, 0, ar, &zerov6Addr, mDNSNULL, &ar->AddressProxy.ip.v6, &ar->WakeUp.IMAC); - } - // Mark for sending. (If no active interfaces, then don't even try.) - ar->SendRNow = (!intf || ar->WakeUp.HMAC.l[0]) ? mDNSNULL : ar->resrec.InterfaceID ? ar->resrec.InterfaceID : intf->InterfaceID; - ar->LastAPTime = m->timenow; - // When we have a late conflict that resets a record to probing state we use a special marker value greater - // than DefaultProbeCountForTypeUnique. Here we detect that state and reset ar->ProbeCount back to the right value. - if (ar->ProbeCount > DefaultProbeCountForTypeUnique) - ar->ProbeCount = DefaultProbeCountForTypeUnique; - ar->ProbeCount--; - SetNextAnnounceProbeTime(m, ar); - if (ar->ProbeCount == 0) - { - // If this is the last probe for this record, then see if we have any matching records - // on our duplicate list which should similarly have their ProbeCount cleared to zero... - AuthRecord *r2; - for (r2 = m->DuplicateRecords; r2; r2=r2->next) - if (r2->resrec.RecordType == kDNSRecordTypeUnique && RecordIsLocalDuplicate(r2, ar)) - r2->ProbeCount = 0; - // ... then acknowledge this record to the client. - // We do this optimistically, just as we're about to send the third probe. - // This helps clients that both advertise and browse, and want to filter themselves - // from the browse results list, because it helps ensure that the registration - // confirmation will be delivered 1/4 second *before* the browse "add" event. - // A potential downside is that we could deliver a registration confirmation and then find out - // moments later that there's a name conflict, but applications have to be prepared to handle - // late conflicts anyway (e.g. on connection of network cable, etc.), so this is nothing new. - if (!ar->Acknowledged) AcknowledgeRecord(m, ar); - } - } - // else, if it has now finished probing, move it to state Verified, - // and update m->NextScheduledResponse so it will be announced - else - { - if (!ar->Acknowledged) AcknowledgeRecord(m, ar); // Defensive, just in case it got missed somehow - ar->resrec.RecordType = kDNSRecordTypeVerified; - ar->ThisAPInterval = DefaultAnnounceIntervalForTypeUnique; - ar->LastAPTime = m->timenow - DefaultAnnounceIntervalForTypeUnique; - SetNextAnnounceProbeTime(m, ar); - } - } - } - m->CurrentRecord = m->DuplicateRecords; - while (m->CurrentRecord) - { - ar = m->CurrentRecord; - m->CurrentRecord = ar->next; - if (ar->resrec.RecordType == kDNSRecordTypeUnique && ar->ProbeCount == 0 && !ar->Acknowledged) - AcknowledgeRecord(m, ar); - } - - // 3. Now we know which queries and probes we're sending, - // go through our interface list sending the appropriate queries on each interface - while (intf) - { - const int OwnerRecordSpace = (m->AnnounceOwner && intf->MAC.l[0]) ? DNSOpt_Header_Space + DNSOpt_Owner_Space(&m->PrimaryMAC, &intf->MAC) : 0; - mDNSu8 *queryptr = m->omsg.data; - InitializeDNSMessage(&m->omsg.h, zeroID, QueryFlags); - if (KnownAnswerList) verbosedebugf("SendQueries: KnownAnswerList set... Will continue from previous packet"); - if (!KnownAnswerList) - { - // Start a new known-answer list - CacheRecord **kalistptr = &KnownAnswerList; - mDNSu32 answerforecast = OwnerRecordSpace; // We start by assuming we'll need at least enough space to put the Owner Option - - // Put query questions in this packet - for (q = m->Questions; q && q != m->NewQuestions; q=q->next) - { - if (mDNSOpaque16IsZero(q->TargetQID) && (q->SendQNow == intf->InterfaceID)) - { - debugf("SendQueries: %s question for %##s (%s) at %d forecast total %d", - SuppressOnThisInterface(q->DupSuppress, intf) ? "Suppressing" : "Putting ", - q->qname.c, DNSTypeName(q->qtype), queryptr - m->omsg.data, queryptr + answerforecast - m->omsg.data); - - // If we're suppressing this question, or we successfully put it, update its SendQNow state - if (SuppressOnThisInterface(q->DupSuppress, intf) || - BuildQuestion(m, &m->omsg, &queryptr, q, &kalistptr, &answerforecast)) - { - q->SendQNow = (q->InterfaceID || !q->SendOnAll) ? mDNSNULL : GetNextActiveInterfaceID(intf); - if (q->WakeOnResolveCount) - { - mDNSSendWakeOnResolve(m, q); - q->WakeOnResolveCount--; - } - } - } - } - - // Put probe questions in this packet - for (ar = m->ResourceRecords; ar; ar=ar->next) - if (ar->SendRNow == intf->InterfaceID) - { - mDNSBool ucast = (ar->ProbeCount >= DefaultProbeCountForTypeUnique-1) && m->CanReceiveUnicastOn5353; - mDNSu16 ucbit = (mDNSu16)(ucast ? kDNSQClass_UnicastResponse : 0); - const mDNSu8 *const limit = m->omsg.data + (m->omsg.h.numQuestions ? NormalMaxDNSMessageData : AbsoluteMaxDNSMessageData); - // We forecast: compressed name (2) type (2) class (2) TTL (4) rdlength (2) rdata (n) - mDNSu32 forecast = answerforecast + 12 + ar->resrec.rdestimate; - mDNSu8 *newptr = putQuestion(&m->omsg, queryptr, limit - forecast, ar->resrec.name, kDNSQType_ANY, (mDNSu16)(ar->resrec.rrclass | ucbit)); - if (newptr) - { - queryptr = newptr; - answerforecast = forecast; - ar->SendRNow = (ar->resrec.InterfaceID) ? mDNSNULL : GetNextActiveInterfaceID(intf); - ar->IncludeInProbe = mDNStrue; - verbosedebugf("SendQueries: Put Question %##s (%s) probecount %d", - ar->resrec.name->c, DNSTypeName(ar->resrec.rrtype), ar->ProbeCount); - } - } - } - - // Put our known answer list (either new one from this question or questions, or remainder of old one from last time) - while (KnownAnswerList) - { - CacheRecord *ka = KnownAnswerList; - mDNSu32 SecsSinceRcvd = ((mDNSu32)(m->timenow - ka->TimeRcvd)) / mDNSPlatformOneSecond; - mDNSu8 *newptr = PutResourceRecordTTLWithLimit(&m->omsg, queryptr, &m->omsg.h.numAnswers, - &ka->resrec, ka->resrec.rroriginalttl - SecsSinceRcvd, m->omsg.data + NormalMaxDNSMessageData - OwnerRecordSpace); - if (newptr) - { - verbosedebugf("SendQueries: Put %##s (%s) at %d - %d", - ka->resrec.name->c, DNSTypeName(ka->resrec.rrtype), queryptr - m->omsg.data, newptr - m->omsg.data); - queryptr = newptr; - KnownAnswerList = ka->NextInKAList; - ka->NextInKAList = mDNSNULL; - } - else - { - // If we ran out of space and we have more than one question in the packet, that's an error -- - // we shouldn't have put more than one question if there was a risk of us running out of space. - if (m->omsg.h.numQuestions > 1) - LogMsg("SendQueries: Put %d answers; No more space for known answers", m->omsg.h.numAnswers); - m->omsg.h.flags.b[0] |= kDNSFlag0_TC; - break; - } - } - - for (ar = m->ResourceRecords; ar; ar=ar->next) - if (ar->IncludeInProbe) - { - mDNSu8 *newptr = PutResourceRecord(&m->omsg, queryptr, &m->omsg.h.numAuthorities, &ar->resrec); - ar->IncludeInProbe = mDNSfalse; - if (newptr) queryptr = newptr; - else LogMsg("SendQueries: How did we fail to have space for the Update record %s", ARDisplayString(m,ar)); - } - - if (queryptr > m->omsg.data) - { - if (OwnerRecordSpace) - { - AuthRecord opt; - mDNS_SetupResourceRecord(&opt, mDNSNULL, mDNSInterface_Any, kDNSType_OPT, kStandardTTL, kDNSRecordTypeKnownUnique, AuthRecordAny, mDNSNULL, mDNSNULL); - opt.resrec.rrclass = NormalMaxDNSMessageData; - opt.resrec.rdlength = sizeof(rdataOPT); // One option in this OPT record - opt.resrec.rdestimate = sizeof(rdataOPT); - SetupOwnerOpt(m, intf, &opt.resrec.rdata->u.opt[0]); - LogSPS("SendQueries putting %s", ARDisplayString(m, &opt)); - queryptr = PutResourceRecordTTLWithLimit(&m->omsg, queryptr, &m->omsg.h.numAdditionals, - &opt.resrec, opt.resrec.rroriginalttl, m->omsg.data + AbsoluteMaxDNSMessageData); - if (!queryptr) - LogMsg("SendQueries: How did we fail to have space for the OPT record (%d/%d/%d/%d) %s", - m->omsg.h.numQuestions, m->omsg.h.numAnswers, m->omsg.h.numAuthorities, m->omsg.h.numAdditionals, ARDisplayString(m, &opt)); - if (queryptr > m->omsg.data + NormalMaxDNSMessageData) - if (m->omsg.h.numQuestions != 1 || m->omsg.h.numAnswers != 0 || m->omsg.h.numAuthorities != 1 || m->omsg.h.numAdditionals != 1) - LogMsg("SendQueries: Why did we generate oversized packet with OPT record %p %p %p (%d/%d/%d/%d) %s", - m->omsg.data, m->omsg.data + NormalMaxDNSMessageData, queryptr, - m->omsg.h.numQuestions, m->omsg.h.numAnswers, m->omsg.h.numAuthorities, m->omsg.h.numAdditionals, ARDisplayString(m, &opt)); - } - - if ((m->omsg.h.flags.b[0] & kDNSFlag0_TC) && m->omsg.h.numQuestions > 1) - LogMsg("SendQueries: Should not have more than one question (%d) in a truncated packet", m->omsg.h.numQuestions); - debugf("SendQueries: Sending %d Question%s %d Answer%s %d Update%s on %p", - m->omsg.h.numQuestions, m->omsg.h.numQuestions == 1 ? "" : "s", - m->omsg.h.numAnswers, m->omsg.h.numAnswers == 1 ? "" : "s", - m->omsg.h.numAuthorities, m->omsg.h.numAuthorities == 1 ? "" : "s", intf->InterfaceID); - if (intf->IPv4Available) mDNSSendDNSMessage(m, &m->omsg, queryptr, intf->InterfaceID, mDNSNULL, &AllDNSLinkGroup_v4, MulticastDNSPort, mDNSNULL, mDNSNULL); - if (intf->IPv6Available) mDNSSendDNSMessage(m, &m->omsg, queryptr, intf->InterfaceID, mDNSNULL, &AllDNSLinkGroup_v6, MulticastDNSPort, mDNSNULL, mDNSNULL); - if (!m->SuppressSending) m->SuppressSending = NonZeroTime(m->timenow + (mDNSPlatformOneSecond+9)/10); - if (++pktcount >= 1000) - { LogMsg("SendQueries exceeded loop limit %d: giving up", pktcount); break; } - // There might be more records left in the known answer list, or more questions to send - // on this interface, so go around one more time and try again. - } - else // Nothing more to send on this interface; go to next - { - const NetworkInterfaceInfo *next = GetFirstActiveInterface(intf->next); - #if MDNS_DEBUGMSGS && 0 - const char *const msg = next ? "SendQueries: Nothing more on %p; moving to %p" : "SendQueries: Nothing more on %p"; - debugf(msg, intf, next); - #endif - intf = next; - } - } - - // 4. Final housekeeping - - // 4a. Debugging check: Make sure we announced all our records - for (ar = m->ResourceRecords; ar; ar=ar->next) - if (ar->SendRNow) - { - if (ar->ARType != AuthRecordLocalOnly && ar->ARType != AuthRecordP2P) - LogMsg("SendQueries: No active interface %p to send probe: %p %s", ar->SendRNow, ar->resrec.InterfaceID, ARDisplayString(m, ar)); - ar->SendRNow = mDNSNULL; - } - - // 4b. When we have lingering cache records that we're keeping around for a few seconds in the hope - // that their interface which went away might come back again, the logic will want to send queries - // for those records, but we can't because their interface isn't here any more, so to keep the - // state machine ticking over we just pretend we did so. - // If the interface does not come back in time, the cache record will expire naturally - FORALL_CACHERECORDS(slot, cg, cr) - if (cr->CRActiveQuestion && cr->UnansweredQueries < MaxUnansweredQueries) - if (m->timenow + TicksTTL(cr)/50 - cr->NextRequiredQuery >= 0) - { - cr->UnansweredQueries++; - cr->CRActiveQuestion->SendQNow = mDNSNULL; - SetNextCacheCheckTimeForRecord(m, cr); - } - - // 4c. Debugging check: Make sure we sent all our planned questions - // Do this AFTER the lingering cache records check above, because that will prevent spurious warnings for questions - // we legitimately couldn't send because the interface is no longer available - for (q = m->Questions; q; q=q->next) - if (q->SendQNow) - { - DNSQuestion *x; - for (x = m->NewQuestions; x; x=x->next) if (x == q) break; // Check if this question is a NewQuestion - LogMsg("SendQueries: No active interface %p to send %s question: %p %##s (%s)", q->SendQNow, x ? "new" : "old", q->InterfaceID, q->qname.c, DNSTypeName(q->qtype)); - q->SendQNow = mDNSNULL; - } - } - -mDNSlocal void SendWakeup(mDNS *const m, mDNSInterfaceID InterfaceID, mDNSEthAddr *EthAddr, mDNSOpaque48 *password) - { - int i, j; - mDNSu8 *ptr = m->omsg.data; - NetworkInterfaceInfo *intf = FirstInterfaceForID(m, InterfaceID); - if (!intf) { LogMsg("SendARP: No interface with InterfaceID %p found", InterfaceID); return; } - - // 0x00 Destination address - for (i=0; i<6; i++) *ptr++ = EthAddr->b[i]; - - // 0x06 Source address (Note: Since we don't currently set the BIOCSHDRCMPLT option, BPF will fill in the real interface address for us) - for (i=0; i<6; i++) *ptr++ = intf->MAC.b[0]; - - // 0x0C Ethertype (0x0842) - *ptr++ = 0x08; - *ptr++ = 0x42; - - // 0x0E Wakeup sync sequence - for (i=0; i<6; i++) *ptr++ = 0xFF; - - // 0x14 Wakeup data - for (j=0; j<16; j++) for (i=0; i<6; i++) *ptr++ = EthAddr->b[i]; - - // 0x74 Password - for (i=0; i<6; i++) *ptr++ = password->b[i]; - - mDNSPlatformSendRawPacket(m->omsg.data, ptr, InterfaceID); - - // For Ethernet switches that don't flood-foward packets with unknown unicast destination MAC addresses, - // broadcast is the only reliable way to get a wakeup packet to the intended target machine. - // For 802.11 WPA networks, where a sleeping target machine may have missed a broadcast/multicast - // key rotation, unicast is the only way to get a wakeup packet to the intended target machine. - // So, we send one of each, unicast first, then broadcast second. - for (i=0; i<6; i++) m->omsg.data[i] = 0xFF; - mDNSPlatformSendRawPacket(m->omsg.data, ptr, InterfaceID); - } - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - RR List Management & Task Management -#endif - -// Whenever a question is answered, reset its state so that we don't query -// the network repeatedly. This happens first time when we answer the question and -// and later when we refresh the cache. -mDNSlocal void ResetQuestionState(mDNS *const m, DNSQuestion *q) - { - q->LastQTime = m->timenow; - q->LastQTxTime = m->timenow; - q->RecentAnswerPkts = 0; - q->ThisQInterval = MaxQuestionInterval; - q->RequestUnicast = mDNSfalse; - // Reset unansweredQueries so that we don't penalize this server later when we - // start sending queries when the cache expires. - q->unansweredQueries = 0; - debugf("ResetQuestionState: Set MaxQuestionInterval for %##s (%s)", q->qname.c, DNSTypeName(q->qtype)); - } - -// Note: AnswerCurrentQuestionWithResourceRecord can call a user callback, which may change the record list and/or question list. -// Any code walking either list must use the m->CurrentQuestion (and possibly m->CurrentRecord) mechanism to protect against this. -// In fact, to enforce this, the routine will *only* answer the question currently pointed to by m->CurrentQuestion, -// which will be auto-advanced (possibly to NULL) if the client callback cancels the question. -mDNSexport void AnswerCurrentQuestionWithResourceRecord(mDNS *const m, CacheRecord *const rr, const QC_result AddRecord) - { - DNSQuestion *const q = m->CurrentQuestion; - mDNSBool followcname = FollowCNAME(q, &rr->resrec, AddRecord); - - verbosedebugf("AnswerCurrentQuestionWithResourceRecord:%4lu %s TTL %d %s", - q->CurrentAnswers, AddRecord ? "Add" : "Rmv", rr->resrec.rroriginalttl, CRDisplayString(m, rr)); - - // Normally we don't send out the unicast query if we have answered using our local only auth records e.g., /etc/hosts. - // But if the query for "A" record has a local answer but query for "AAAA" record has no local answer, we might - // send the AAAA query out which will come back with CNAME and will also answer the "A" query. To prevent that, - // we check to see if that query already has a unique local answer. - if (q->LOAddressAnswers) - { - LogInfo("AnswerCurrentQuestionWithResourceRecord: Question %p %##s (%s) not answering with record %s due to " - "LOAddressAnswers %d", q, q->qname.c, DNSTypeName(q->qtype), ARDisplayString(m, rr), - q->LOAddressAnswers); - return; - } - - if (QuerySuppressed(q)) - { - // If the query is suppressed, then we don't want to answer from the cache. But if this query is - // supposed to time out, we still want to callback the clients. We do this only for TimeoutQuestions - // that are timing out, which we know are answered with Negative cache record when timing out. - if (!q->TimeoutQuestion || rr->resrec.RecordType != kDNSRecordTypePacketNegative || (m->timenow - q->StopTime < 0)) - return; - } - - // Note: Use caution here. In the case of records with rr->DelayDelivery set, AnswerCurrentQuestionWithResourceRecord(... mDNStrue) - // may be called twice, once when the record is received, and again when it's time to notify local clients. - // If any counters or similar are added here, care must be taken to ensure that they are not double-incremented by this. - - rr->LastUsed = m->timenow; - if (AddRecord == QC_add && !q->DuplicateOf && rr->CRActiveQuestion != q) - { - if (!rr->CRActiveQuestion) m->rrcache_active++; // If not previously active, increment rrcache_active count - debugf("AnswerCurrentQuestionWithResourceRecord: Updating CRActiveQuestion from %p to %p for cache record %s, CurrentAnswer %d", - rr->CRActiveQuestion, q, CRDisplayString(m,rr), q->CurrentAnswers); - rr->CRActiveQuestion = q; // We know q is non-null - SetNextCacheCheckTimeForRecord(m, rr); - } - - // If this is: - // (a) a no-cache add, where we've already done at least one 'QM' query, or - // (b) a normal add, where we have at least one unique-type answer, - // then there's no need to keep polling the network. - // (If we have an answer in the cache, then we'll automatically ask again in time to stop it expiring.) - // We do this for mDNS questions and uDNS one-shot questions, but not for - // uDNS LongLived questions, because that would mess up our LLQ lease renewal timing. - if ((AddRecord == QC_addnocache && !q->RequestUnicast) || - (AddRecord == QC_add && (q->ExpectUnique || (rr->resrec.RecordType & kDNSRecordTypePacketUniqueMask)))) - if (ActiveQuestion(q) && (mDNSOpaque16IsZero(q->TargetQID) || !q->LongLived)) - { - ResetQuestionState(m, q); - } - - if (rr->DelayDelivery) return; // We'll come back later when CacheRecordDeferredAdd() calls us - - // Only deliver negative answers if client has explicitly requested them - if (rr->resrec.RecordType == kDNSRecordTypePacketNegative || (q->qtype != kDNSType_NSEC && RRAssertsNonexistence(&rr->resrec, q->qtype))) - if (!AddRecord || !q->ReturnIntermed) return; - - // For CNAME results to non-CNAME questions, only inform the client if they explicitly requested that - if (q->QuestionCallback && !q->NoAnswer && (!followcname || q->ReturnIntermed)) - { - mDNS_DropLockBeforeCallback(); // Allow client (and us) to legally make mDNS API calls - if (q->qtype != kDNSType_NSEC && RRAssertsNonexistence(&rr->resrec, q->qtype)) - { - CacheRecord neg; - MakeNegativeCacheRecord(m, &neg, &q->qname, q->qnamehash, q->qtype, q->qclass, 1, rr->resrec.InterfaceID, q->qDNSServer); - q->QuestionCallback(m, q, &neg.resrec, AddRecord); - } - else - q->QuestionCallback(m, q, &rr->resrec, AddRecord); - mDNS_ReclaimLockAfterCallback(); // Decrement mDNS_reentrancy to block mDNS API calls again - } - // Note: Proceed with caution here because client callback function is allowed to do anything, - // including starting/stopping queries, registering/deregistering records, etc. - - if (followcname && m->CurrentQuestion == q) - AnswerQuestionByFollowingCNAME(m, q, &rr->resrec); - } - -// New Questions are answered through AnswerNewQuestion. But there may not have been any -// matching cache records for the questions when it is called. There are two possibilities. -// -// 1) There are no cache records -// 2) There are cache records but the DNSServers between question and cache record don't match. -// -// In the case of (1), where there are no cache records and later we add them when we get a response, -// CacheRecordAdd/CacheRecordDeferredAdd will take care of adding the cache and delivering the ADD -// events to the application. If we already have a cache entry, then no ADD events are delivered -// unless the RDATA has changed -// -// In the case of (2) where we had the cache records and did not answer because of the DNSServer mismatch, -// we need to answer them whenever we change the DNSServer. But we can't do it at the instant the DNSServer -// changes because when we do the callback, the question can get deleted and the calling function would not -// know how to handle it. So, we run this function from mDNS_Execute to handle DNSServer changes on the -// question - -mDNSlocal void AnswerQuestionsForDNSServerChanges(mDNS *const m) - { - DNSQuestion *q; - DNSQuestion *qnext; - CacheRecord *rr; - mDNSu32 slot; - CacheGroup *cg; - - if (m->CurrentQuestion) - LogMsg("AnswerQuestionsForDNSServerChanges: ERROR m->CurrentQuestion already set: %##s (%s)", - m->CurrentQuestion->qname.c, DNSTypeName(m->CurrentQuestion->qtype)); - - for (q = m->Questions; q && q != m->NewQuestions; q = qnext) - { - qnext = q->next; - - // multicast or DNSServers did not change. - if (mDNSOpaque16IsZero(q->TargetQID)) continue; - if (!q->deliverAddEvents) continue; - - // We are going to look through the cache for this question since it changed - // its DNSserver last time. Reset it so that we don't call them again. Calling - // them again will deliver duplicate events to the application - q->deliverAddEvents = mDNSfalse; - if (QuerySuppressed(q)) continue; - m->CurrentQuestion = q; - slot = HashSlot(&q->qname); - cg = CacheGroupForName(m, slot, q->qnamehash, &q->qname); - for (rr = cg ? cg->members : mDNSNULL; rr; rr=rr->next) - { - if (SameNameRecordAnswersQuestion(&rr->resrec, q)) - { - LogInfo("AnswerQuestionsForDNSServerChanges: Calling AnswerCurrentQuestionWithResourceRecord for question %p %##s using resource record %s", - q, q->qname.c, CRDisplayString(m, rr)); - // When this question penalizes a DNS server and has no more DNS servers to pick, we normally - // deliver a negative cache response and suspend the question for 60 seconds (see uDNS_CheckCurrentQuestion). - // But sometimes we may already find the negative cache entry and deliver that here as the process - // of changing DNS servers. When the cache entry is about to expire, we will resend the question and - // that time, we need to make sure that we have a valid DNS server. Otherwise, we will deliver - // a negative cache response without trying the server. - if (!q->qDNSServer && !q->DuplicateOf && rr->resrec.RecordType == kDNSRecordTypePacketNegative) - { - DNSQuestion *qptr; - SetValidDNSServers(m, q); - q->qDNSServer = GetServerForQuestion(m, q); - for (qptr = q->next ; qptr; qptr = qptr->next) - if (qptr->DuplicateOf == q) { qptr->validDNSServers = q->validDNSServers; qptr->qDNSServer = q->qDNSServer; } - } - q->CurrentAnswers++; - if (rr->resrec.rdlength > SmallRecordLimit) q->LargeAnswers++; - if (rr->resrec.RecordType & kDNSRecordTypePacketUniqueMask) q->UniqueAnswers++; - AnswerCurrentQuestionWithResourceRecord(m, rr, QC_add); - if (m->CurrentQuestion != q) break; // If callback deleted q, then we're finished here - } - } - } - m->CurrentQuestion = mDNSNULL; - } - -mDNSlocal void CacheRecordDeferredAdd(mDNS *const m, CacheRecord *rr) - { - rr->DelayDelivery = 0; - if (m->CurrentQuestion) - LogMsg("CacheRecordDeferredAdd ERROR m->CurrentQuestion already set: %##s (%s)", - m->CurrentQuestion->qname.c, DNSTypeName(m->CurrentQuestion->qtype)); - m->CurrentQuestion = m->Questions; - while (m->CurrentQuestion && m->CurrentQuestion != m->NewQuestions) - { - DNSQuestion *q = m->CurrentQuestion; - if (ResourceRecordAnswersQuestion(&rr->resrec, q)) - AnswerCurrentQuestionWithResourceRecord(m, rr, QC_add); - if (m->CurrentQuestion == q) // If m->CurrentQuestion was not auto-advanced, do it ourselves now - m->CurrentQuestion = q->next; - } - m->CurrentQuestion = mDNSNULL; - } - -mDNSlocal mDNSs32 CheckForSoonToExpireRecords(mDNS *const m, const domainname *const name, const mDNSu32 namehash, const mDNSu32 slot) - { - const mDNSs32 threshhold = m->timenow + mDNSPlatformOneSecond; // See if there are any records expiring within one second - const mDNSs32 start = m->timenow - 0x10000000; - mDNSs32 delay = start; - CacheGroup *cg = CacheGroupForName(m, slot, namehash, name); - const CacheRecord *rr; - for (rr = cg ? cg->members : mDNSNULL; rr; rr=rr->next) - if (threshhold - RRExpireTime(rr) >= 0) // If we have records about to expire within a second - if (delay - RRExpireTime(rr) < 0) // then delay until after they've been deleted - delay = RRExpireTime(rr); - if (delay - start > 0) return(NonZeroTime(delay)); - else return(0); - } - -// CacheRecordAdd is only called from CreateNewCacheEntry, *never* directly as a result of a client API call. -// If new questions are created as a result of invoking client callbacks, they will be added to -// the end of the question list, and m->NewQuestions will be set to indicate the first new question. -// rr is a new CacheRecord just received into our cache -// (kDNSRecordTypePacketAns/PacketAnsUnique/PacketAdd/PacketAddUnique). -// Note: CacheRecordAdd calls AnswerCurrentQuestionWithResourceRecord which can call a user callback, -// which may change the record list and/or question list. -// Any code walking either list must use the CurrentQuestion and/or CurrentRecord mechanism to protect against this. -mDNSlocal void CacheRecordAdd(mDNS *const m, CacheRecord *rr) - { - DNSQuestion *q; - - // We stop when we get to NewQuestions -- if we increment their CurrentAnswers/LargeAnswers/UniqueAnswers - // counters here we'll end up double-incrementing them when we do it again in AnswerNewQuestion(). - for (q = m->Questions; q && q != m->NewQuestions; q=q->next) - { - if (ResourceRecordAnswersQuestion(&rr->resrec, q)) - { - // If this question is one that's actively sending queries, and it's received ten answers within one - // second of sending the last query packet, then that indicates some radical network topology change, - // so reset its exponential backoff back to the start. We must be at least at the eight-second interval - // to do this. If we're at the four-second interval, or less, there's not much benefit accelerating - // because we will anyway send another query within a few seconds. The first reset query is sent out - // randomized over the next four seconds to reduce possible synchronization between machines. - if (q->LastAnswerPktNum != m->PktNum) - { - q->LastAnswerPktNum = m->PktNum; - if (mDNSOpaque16IsZero(q->TargetQID) && ActiveQuestion(q) && ++q->RecentAnswerPkts >= 10 && - q->ThisQInterval > InitialQuestionInterval * QuestionIntervalStep3 && m->timenow - q->LastQTxTime < mDNSPlatformOneSecond) - { - LogMsg("CacheRecordAdd: %##s (%s) got immediate answer burst (%d); restarting exponential backoff sequence (%d)", - q->qname.c, DNSTypeName(q->qtype), q->RecentAnswerPkts, q->ThisQInterval); - q->LastQTime = m->timenow - InitialQuestionInterval + (mDNSs32)mDNSRandom((mDNSu32)mDNSPlatformOneSecond*4); - q->ThisQInterval = InitialQuestionInterval; - SetNextQueryTime(m,q); - } - } - verbosedebugf("CacheRecordAdd %p %##s (%s) %lu %#a:%d question %p", rr, rr->resrec.name->c, - DNSTypeName(rr->resrec.rrtype), rr->resrec.rroriginalttl, rr->resrec.rDNSServer ? - &rr->resrec.rDNSServer->addr : mDNSNULL, mDNSVal16(rr->resrec.rDNSServer ? - rr->resrec.rDNSServer->port : zeroIPPort), q); - q->CurrentAnswers++; - q->unansweredQueries = 0; - if (rr->resrec.rdlength > SmallRecordLimit) q->LargeAnswers++; - if (rr->resrec.RecordType & kDNSRecordTypePacketUniqueMask) q->UniqueAnswers++; - if (q->CurrentAnswers > 4000) - { - static int msgcount = 0; - if (msgcount++ < 10) - LogMsg("CacheRecordAdd: %##s (%s) has %d answers; shedding records to resist DOS attack", - q->qname.c, DNSTypeName(q->qtype), q->CurrentAnswers); - rr->resrec.rroriginalttl = 0; - rr->UnansweredQueries = MaxUnansweredQueries; - } - } - } - - if (!rr->DelayDelivery) - { - if (m->CurrentQuestion) - LogMsg("CacheRecordAdd ERROR m->CurrentQuestion already set: %##s (%s)", m->CurrentQuestion->qname.c, DNSTypeName(m->CurrentQuestion->qtype)); - m->CurrentQuestion = m->Questions; - while (m->CurrentQuestion && m->CurrentQuestion != m->NewQuestions) - { - q = m->CurrentQuestion; - if (ResourceRecordAnswersQuestion(&rr->resrec, q)) - AnswerCurrentQuestionWithResourceRecord(m, rr, QC_add); - if (m->CurrentQuestion == q) // If m->CurrentQuestion was not auto-advanced, do it ourselves now - m->CurrentQuestion = q->next; - } - m->CurrentQuestion = mDNSNULL; - } - - SetNextCacheCheckTimeForRecord(m, rr); - } - -// NoCacheAnswer is only called from mDNSCoreReceiveResponse, *never* directly as a result of a client API call. -// If new questions are created as a result of invoking client callbacks, they will be added to -// the end of the question list, and m->NewQuestions will be set to indicate the first new question. -// rr is a new CacheRecord just received from the wire (kDNSRecordTypePacketAns/AnsUnique/Add/AddUnique) -// but we don't have any place to cache it. We'll deliver question 'add' events now, but we won't have any -// way to deliver 'remove' events in future, nor will we be able to include this in known-answer lists, -// so we immediately bump ThisQInterval up to MaxQuestionInterval to avoid pounding the network. -// Note: NoCacheAnswer calls AnswerCurrentQuestionWithResourceRecord which can call a user callback, -// which may change the record list and/or question list. -// Any code walking either list must use the CurrentQuestion and/or CurrentRecord mechanism to protect against this. -mDNSlocal void NoCacheAnswer(mDNS *const m, CacheRecord *rr) - { - LogMsg("No cache space: Delivering non-cached result for %##s", m->rec.r.resrec.name->c); - if (m->CurrentQuestion) - LogMsg("NoCacheAnswer ERROR m->CurrentQuestion already set: %##s (%s)", m->CurrentQuestion->qname.c, DNSTypeName(m->CurrentQuestion->qtype)); - m->CurrentQuestion = m->Questions; - // We do this for *all* questions, not stopping when we get to m->NewQuestions, - // since we're not caching the record and we'll get no opportunity to do this later - while (m->CurrentQuestion) - { - DNSQuestion *q = m->CurrentQuestion; - if (ResourceRecordAnswersQuestion(&rr->resrec, q)) - AnswerCurrentQuestionWithResourceRecord(m, rr, QC_addnocache); // QC_addnocache means "don't expect remove events for this" - if (m->CurrentQuestion == q) // If m->CurrentQuestion was not auto-advanced, do it ourselves now - m->CurrentQuestion = q->next; - } - m->CurrentQuestion = mDNSNULL; - } - -// CacheRecordRmv is only called from CheckCacheExpiration, which is called from mDNS_Execute. -// Note that CacheRecordRmv is *only* called for records that are referenced by at least one active question. -// If new questions are created as a result of invoking client callbacks, they will be added to -// the end of the question list, and m->NewQuestions will be set to indicate the first new question. -// rr is an existing cache CacheRecord that just expired and is being deleted -// (kDNSRecordTypePacketAns/PacketAnsUnique/PacketAdd/PacketAddUnique). -// Note: CacheRecordRmv calls AnswerCurrentQuestionWithResourceRecord which can call a user callback, -// which may change the record list and/or question list. -// Any code walking either list must use the CurrentQuestion and/or CurrentRecord mechanism to protect against this. -mDNSlocal void CacheRecordRmv(mDNS *const m, CacheRecord *rr) - { - if (m->CurrentQuestion) - LogMsg("CacheRecordRmv ERROR m->CurrentQuestion already set: %##s (%s)", - m->CurrentQuestion->qname.c, DNSTypeName(m->CurrentQuestion->qtype)); - m->CurrentQuestion = m->Questions; - - // We stop when we get to NewQuestions -- for new questions their CurrentAnswers/LargeAnswers/UniqueAnswers counters - // will all still be zero because we haven't yet gone through the cache counting how many answers we have for them. - while (m->CurrentQuestion && m->CurrentQuestion != m->NewQuestions) - { - DNSQuestion *q = m->CurrentQuestion; - // When a question enters suppressed state, we generate RMV events and generate a negative - // response. A cache may be present that answers this question e.g., cache entry generated - // before the question became suppressed. We need to skip the suppressed questions here as - // the RMV event has already been generated. - if (!QuerySuppressed(q) && ResourceRecordAnswersQuestion(&rr->resrec, q)) - { - verbosedebugf("CacheRecordRmv %p %s", rr, CRDisplayString(m, rr)); - q->FlappingInterface1 = mDNSNULL; - q->FlappingInterface2 = mDNSNULL; - - // When a question changes DNS server, it is marked with deliverAddEvents if we find any - // cache entry corresponding to the new DNS server. Before we deliver the ADD event, the - // cache entry may be removed in which case CurrentAnswers can be zero. - if (q->deliverAddEvents && !q->CurrentAnswers) - { - LogInfo("CacheRecordRmv: Question %p %##s (%s) deliverAddEvents set, DNSServer %#a:%d", - q, q->qname.c, DNSTypeName(q->qtype), q->qDNSServer ? &q->qDNSServer->addr : mDNSNULL, - mDNSVal16(q->qDNSServer ? q->qDNSServer->port : zeroIPPort)); - m->CurrentQuestion = q->next; - continue; - } - if (q->CurrentAnswers == 0) - LogMsg("CacheRecordRmv ERROR!!: How can CurrentAnswers already be zero for %p %##s (%s) DNSServer %#a:%d", - q, q->qname.c, DNSTypeName(q->qtype), q->qDNSServer ? &q->qDNSServer->addr : mDNSNULL, - mDNSVal16(q->qDNSServer ? q->qDNSServer->port : zeroIPPort)); - else - { - q->CurrentAnswers--; - if (rr->resrec.rdlength > SmallRecordLimit) q->LargeAnswers--; - if (rr->resrec.RecordType & kDNSRecordTypePacketUniqueMask) q->UniqueAnswers--; - } - if (rr->resrec.rdata->MaxRDLength) // Never generate "remove" events for negative results - { - if (q->CurrentAnswers == 0) - { - LogInfo("CacheRecordRmv: Last answer for %##s (%s) expired from cache; will reconfirm antecedents", - q->qname.c, DNSTypeName(q->qtype)); - ReconfirmAntecedents(m, &q->qname, q->qnamehash, 0); - } - AnswerCurrentQuestionWithResourceRecord(m, rr, QC_rmv); - } - } - if (m->CurrentQuestion == q) // If m->CurrentQuestion was not auto-advanced, do it ourselves now - m->CurrentQuestion = q->next; - } - m->CurrentQuestion = mDNSNULL; - } - -mDNSlocal void ReleaseCacheEntity(mDNS *const m, CacheEntity *e) - { -#if APPLE_OSX_mDNSResponder && MACOSX_MDNS_MALLOC_DEBUGGING >= 1 - unsigned int i; - for (i=0; inext = m->rrcache_free; - m->rrcache_free = e; - m->rrcache_totalused--; - } - -mDNSlocal void ReleaseCacheGroup(mDNS *const m, CacheGroup **cp) - { - CacheEntity *e = (CacheEntity *)(*cp); - //LogMsg("ReleaseCacheGroup: Releasing CacheGroup for %p, %##s", (*cp)->name->c, (*cp)->name->c); - if ((*cp)->rrcache_tail != &(*cp)->members) - LogMsg("ERROR: (*cp)->members == mDNSNULL but (*cp)->rrcache_tail != &(*cp)->members)"); - //if ((*cp)->name != (domainname*)((*cp)->namestorage)) - // LogMsg("ReleaseCacheGroup: %##s, %p %p", (*cp)->name->c, (*cp)->name, (domainname*)((*cp)->namestorage)); - if ((*cp)->name != (domainname*)((*cp)->namestorage)) mDNSPlatformMemFree((*cp)->name); - (*cp)->name = mDNSNULL; - *cp = (*cp)->next; // Cut record from list - ReleaseCacheEntity(m, e); - } - -mDNSlocal void ReleaseCacheRecord(mDNS *const m, CacheRecord *r) - { - //LogMsg("ReleaseCacheRecord: Releasing %s", CRDisplayString(m, r)); - if (r->resrec.rdata && r->resrec.rdata != (RData*)&r->smallrdatastorage) mDNSPlatformMemFree(r->resrec.rdata); - r->resrec.rdata = mDNSNULL; - ReleaseCacheEntity(m, (CacheEntity *)r); - } - -// Note: We want to be careful that we deliver all the CacheRecordRmv calls before delivering -// CacheRecordDeferredAdd calls. The in-order nature of the cache lists ensures that all -// callbacks for old records are delivered before callbacks for newer records. -mDNSlocal void CheckCacheExpiration(mDNS *const m, const mDNSu32 slot, CacheGroup *const cg) - { - CacheRecord **rp = &cg->members; - - if (m->lock_rrcache) { LogMsg("CheckCacheExpiration ERROR! Cache already locked!"); return; } - m->lock_rrcache = 1; - - while (*rp) - { - CacheRecord *const rr = *rp; - mDNSs32 event = RRExpireTime(rr); - if (m->timenow - event >= 0) // If expired, delete it - { - *rp = rr->next; // Cut it from the list - verbosedebugf("CheckCacheExpiration: Deleting%7d %7d %p %s", - m->timenow - rr->TimeRcvd, rr->resrec.rroriginalttl, rr->CRActiveQuestion, CRDisplayString(m, rr)); - if (rr->CRActiveQuestion) // If this record has one or more active questions, tell them it's going away - { - DNSQuestion *q = rr->CRActiveQuestion; - // When a cache record is about to expire, we expect to do four queries at 80-82%, 85-87%, 90-92% and - // then 95-97% of the TTL. If the DNS server does not respond, then we will remove the cache entry - // before we pick a new DNS server. As the question interval is set to MaxQuestionInterval, we may - // not send out a query anytime soon. Hence, we need to reset the question interval. If this is - // a normal deferred ADD case, then AnswerCurrentQuestionWithResourceRecord will reset it to - // MaxQuestionInterval. If we have inactive questions referring to negative cache entries, - // don't ressurect them as they will deliver duplicate "No such Record" ADD events - if (!mDNSOpaque16IsZero(q->TargetQID) && !q->LongLived && ActiveQuestion(q)) - { - q->ThisQInterval = InitialQuestionInterval; - q->LastQTime = m->timenow - q->ThisQInterval; - SetNextQueryTime(m, q); - } - CacheRecordRmv(m, rr); - m->rrcache_active--; - } - ReleaseCacheRecord(m, rr); - } - else // else, not expired; see if we need to query - { - // If waiting to delay delivery, do nothing until then - if (rr->DelayDelivery && rr->DelayDelivery - m->timenow > 0) - event = rr->DelayDelivery; - else - { - if (rr->DelayDelivery) CacheRecordDeferredAdd(m, rr); - if (rr->CRActiveQuestion && rr->UnansweredQueries < MaxUnansweredQueries) - { - if (m->timenow - rr->NextRequiredQuery < 0) // If not yet time for next query - event = NextCacheCheckEvent(rr); // then just record when we want the next query - else // else trigger our question to go out now - { - // Set NextScheduledQuery to timenow so that SendQueries() will run. - // SendQueries() will see that we have records close to expiration, and send FEQs for them. - m->NextScheduledQuery = m->timenow; - // After sending the query we'll increment UnansweredQueries and call SetNextCacheCheckTimeForRecord(), - // which will correctly update m->NextCacheCheck for us. - event = m->timenow + 0x3FFFFFFF; - } - } - } - verbosedebugf("CheckCacheExpiration:%6d %5d %s", - (event - m->timenow) / mDNSPlatformOneSecond, CacheCheckGracePeriod(rr), CRDisplayString(m, rr)); - if (m->rrcache_nextcheck[slot] - event > 0) - m->rrcache_nextcheck[slot] = event; - rp = &rr->next; - } - } - if (cg->rrcache_tail != rp) verbosedebugf("CheckCacheExpiration: Updating CacheGroup tail from %p to %p", cg->rrcache_tail, rp); - cg->rrcache_tail = rp; - m->lock_rrcache = 0; - } - -mDNSlocal void AnswerNewQuestion(mDNS *const m) - { - mDNSBool ShouldQueryImmediately = mDNStrue; - DNSQuestion *const q = m->NewQuestions; // Grab the question we're going to answer - mDNSu32 slot = HashSlot(&q->qname); - CacheGroup *const cg = CacheGroupForName(m, slot, q->qnamehash, &q->qname); - AuthRecord *lr; - AuthGroup *ag; - mDNSBool AnsweredFromCache = mDNSfalse; - - verbosedebugf("AnswerNewQuestion: Answering %##s (%s)", q->qname.c, DNSTypeName(q->qtype)); - - if (cg) CheckCacheExpiration(m, slot, cg); - if (m->NewQuestions != q) { LogInfo("AnswerNewQuestion: Question deleted while doing CheckCacheExpiration"); goto exit; } - m->NewQuestions = q->next; - // Advance NewQuestions to the next *after* calling CheckCacheExpiration, because if we advance it first - // then CheckCacheExpiration may give this question add/remove callbacks, and it's not yet ready for that. - // - // Also, CheckCacheExpiration() calls CacheRecordDeferredAdd() and CacheRecordRmv(), which invoke - // client callbacks, which may delete their own or any other question. Our mechanism for detecting - // whether our current m->NewQuestions question got deleted by one of these callbacks is to store the - // value of m->NewQuestions in 'q' before calling CheckCacheExpiration(), and then verify afterwards - // that they're still the same. If m->NewQuestions has changed (because mDNS_StopQuery_internal - // advanced it), that means the question was deleted, so we no longer need to worry about answering - // it (and indeed 'q' is now a dangling pointer, so dereferencing it at all would be bad, and the - // values we computed for slot and cg are now stale and relate to a question that no longer exists). - // - // We can't use the usual m->CurrentQuestion mechanism for this because CacheRecordDeferredAdd() and - // CacheRecordRmv() both use that themselves when walking the list of (non-new) questions generating callbacks. - // Fortunately mDNS_StopQuery_internal auto-advances both m->CurrentQuestion *AND* m->NewQuestions when - // deleting a question, so luckily we have an easy alternative way of detecting if our question got deleted. - - if (m->lock_rrcache) LogMsg("AnswerNewQuestion ERROR! Cache already locked!"); - // This should be safe, because calling the client's question callback may cause the - // question list to be modified, but should not ever cause the rrcache list to be modified. - // If the client's question callback deletes the question, then m->CurrentQuestion will - // be advanced, and we'll exit out of the loop - m->lock_rrcache = 1; - if (m->CurrentQuestion) - LogMsg("AnswerNewQuestion ERROR m->CurrentQuestion already set: %##s (%s)", - m->CurrentQuestion->qname.c, DNSTypeName(m->CurrentQuestion->qtype)); - m->CurrentQuestion = q; // Indicate which question we're answering, so we'll know if it gets deleted - - if (q->NoAnswer == NoAnswer_Fail) - { - LogMsg("AnswerNewQuestion: NoAnswer_Fail %##s (%s)", q->qname.c, DNSTypeName(q->qtype)); - MakeNegativeCacheRecord(m, &m->rec.r, &q->qname, q->qnamehash, q->qtype, q->qclass, 60, mDNSInterface_Any, q->qDNSServer); - q->NoAnswer = NoAnswer_Normal; // Temporarily turn off answer suppression - AnswerCurrentQuestionWithResourceRecord(m, &m->rec.r, QC_addnocache); - // Don't touch the question if it has been stopped already - if (m->CurrentQuestion == q) q->NoAnswer = NoAnswer_Fail; // Restore NoAnswer state - m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it - } - if (m->CurrentQuestion != q) { LogInfo("AnswerNewQuestion: Question deleted while generating NoAnswer_Fail response"); goto exit; } - - // See if we want to tell it about LocalOnly records - if (m->CurrentRecord) - LogMsg("AnswerNewQuestion ERROR m->CurrentRecord already set %s", ARDisplayString(m, m->CurrentRecord)); - slot = AuthHashSlot(&q->qname); - ag = AuthGroupForName(&m->rrauth, slot, q->qnamehash, &q->qname); - if (ag) - { - m->CurrentRecord = ag->members; - while (m->CurrentRecord && m->CurrentRecord != ag->NewLocalOnlyRecords) - { - AuthRecord *rr = m->CurrentRecord; - m->CurrentRecord = rr->next; - // - // If the question is mDNSInterface_LocalOnly, all records local to the machine should be used - // to answer the query. This is handled in AnswerNewLocalOnlyQuestion. - // - // We handle mDNSInterface_Any and scoped questions here. See LocalOnlyRecordAnswersQuestion for more - // details on how we handle this case. For P2P we just handle "Interface_Any" questions. For LocalOnly - // we handle both mDNSInterface_Any and scoped questions. - - if (rr->ARType == AuthRecordLocalOnly || (rr->ARType == AuthRecordP2P && q->InterfaceID == mDNSInterface_Any)) - if (LocalOnlyRecordAnswersQuestion(rr, q)) - { - AnswerLocalQuestionWithLocalAuthRecord(m, rr, mDNStrue); - if (m->CurrentQuestion != q) break; // If callback deleted q, then we're finished here - } - } - } - m->CurrentRecord = mDNSNULL; - - if (m->CurrentQuestion != q) { LogInfo("AnswerNewQuestion: Question deleted while while giving LocalOnly record answers"); goto exit; } - - if (q->LOAddressAnswers) - { - LogInfo("AnswerNewQuestion: Question %p %##s (%s) answered using local auth records LOAddressAnswers %d", - q, q->qname.c, DNSTypeName(q->qtype), q->LOAddressAnswers); - goto exit; - } - - // Before we go check the cache and ship this query on the wire, we have to be sure that there are - // no local records that could possibly answer this question. As we did not check the NewLocalRecords, we - // need to just peek at them to see whether it will answer this question. If it would answer, pretend - // that we answered. AnswerAllLocalQuestionsWithLocalAuthRecord will answer shortly. This happens normally - // when we add new /etc/hosts entries and restart the question. It is a new question and also a new record. - if (ag) - { - lr = ag->NewLocalOnlyRecords; - while (lr) - { - if (LORecordAnswersAddressType(lr) && LocalOnlyRecordAnswersQuestion(lr, q)) - { - LogInfo("AnswerNewQuestion: Question %p %##s (%s) will be answered using new local auth records " - " LOAddressAnswers %d", q, q->qname.c, DNSTypeName(q->qtype), q->LOAddressAnswers); - goto exit; - } - lr = lr->next; - } - } - - - // If we are not supposed to answer this question, generate a negative response. - // Temporarily suspend the SuppressQuery so that AnswerCurrentQuestionWithResourceRecord can answer the question - if (QuerySuppressed(q)) { q->SuppressQuery = mDNSfalse; GenerateNegativeResponse(m); q->SuppressQuery = mDNStrue; } - else - { - CacheRecord *rr; - for (rr = cg ? cg->members : mDNSNULL; rr; rr=rr->next) - if (SameNameRecordAnswersQuestion(&rr->resrec, q)) - { - // SecsSinceRcvd is whole number of elapsed seconds, rounded down - mDNSu32 SecsSinceRcvd = ((mDNSu32)(m->timenow - rr->TimeRcvd)) / mDNSPlatformOneSecond; - if (rr->resrec.rroriginalttl <= SecsSinceRcvd) - { - LogMsg("AnswerNewQuestion: How is rr->resrec.rroriginalttl %lu <= SecsSinceRcvd %lu for %s %d %d", - rr->resrec.rroriginalttl, SecsSinceRcvd, CRDisplayString(m, rr), m->timenow, rr->TimeRcvd); - continue; // Go to next one in loop - } - - // If this record set is marked unique, then that means we can reasonably assume we have the whole set - // -- we don't need to rush out on the network and query immediately to see if there are more answers out there - if ((rr->resrec.RecordType & kDNSRecordTypePacketUniqueMask) || (q->ExpectUnique)) - ShouldQueryImmediately = mDNSfalse; - q->CurrentAnswers++; - if (rr->resrec.rdlength > SmallRecordLimit) q->LargeAnswers++; - if (rr->resrec.RecordType & kDNSRecordTypePacketUniqueMask) q->UniqueAnswers++; - AnsweredFromCache = mDNStrue; - AnswerCurrentQuestionWithResourceRecord(m, rr, QC_add); - if (m->CurrentQuestion != q) break; // If callback deleted q, then we're finished here - } - else if (RRTypeIsAddressType(rr->resrec.rrtype) && RRTypeIsAddressType(q->qtype)) - ShouldQueryImmediately = mDNSfalse; - } - // We don't use LogInfo for this "Question deleted" message because it happens so routinely that - // it's not remotely remarkable, and therefore unlikely to be of much help tracking down bugs. - if (m->CurrentQuestion != q) { debugf("AnswerNewQuestion: Question deleted while giving cache answers"); goto exit; } - - // Neither a local record nor a cache entry could answer this question. If this question need to be retried - // with search domains, generate a negative response which will now retry after appending search domains. - // If the query was suppressed above, we already generated a negative response. When it gets unsuppressed, - // we will retry with search domains. - if (!QuerySuppressed(q) && !AnsweredFromCache && q->RetryWithSearchDomains) - { - LogInfo("AnswerNewQuestion: Generating response for retrying with search domains %##s (%s)", q->qname.c, DNSTypeName(q->qtype)); - GenerateNegativeResponse(m); - } - - if (m->CurrentQuestion != q) { debugf("AnswerNewQuestion: Question deleted while giving negative answer"); goto exit; } - - // Note: When a query gets suppressed or retried with search domains, we de-activate the question. - // Hence we don't execute the following block of code for those cases. - if (ShouldQueryImmediately && ActiveQuestion(q)) - { - debugf("AnswerNewQuestion: ShouldQueryImmediately %##s (%s)", q->qname.c, DNSTypeName(q->qtype)); - q->ThisQInterval = InitialQuestionInterval; - q->LastQTime = m->timenow - q->ThisQInterval; - if (mDNSOpaque16IsZero(q->TargetQID)) // For mDNS, spread packets to avoid a burst of simultaneous queries - { - // Compute random delay in the range 1-6 seconds, then divide by 50 to get 20-120ms - if (!m->RandomQueryDelay) - m->RandomQueryDelay = (mDNSPlatformOneSecond + mDNSRandom(mDNSPlatformOneSecond*5) - 1) / 50 + 1; - q->LastQTime += m->RandomQueryDelay; - } - } - - // IN ALL CASES make sure that m->NextScheduledQuery is set appropriately. - // In cases where m->NewQuestions->DelayAnswering is set, we may have delayed generating our - // answers for this question until *after* its scheduled transmission time, in which case - // m->NextScheduledQuery may now be set to 'never', and in that case -- even though we're *not* doing - // ShouldQueryImmediately -- we still need to make sure we set m->NextScheduledQuery correctly. - SetNextQueryTime(m,q); - -exit: - m->CurrentQuestion = mDNSNULL; - m->lock_rrcache = 0; - } - -// When a NewLocalOnlyQuestion is created, AnswerNewLocalOnlyQuestion runs though our ResourceRecords delivering any -// appropriate answers, stopping if it reaches a NewLocalOnlyRecord -- these will be handled by AnswerAllLocalQuestionsWithLocalAuthRecord -mDNSlocal void AnswerNewLocalOnlyQuestion(mDNS *const m) - { - mDNSu32 slot; - AuthGroup *ag; - DNSQuestion *q = m->NewLocalOnlyQuestions; // Grab the question we're going to answer - m->NewLocalOnlyQuestions = q->next; // Advance NewLocalOnlyQuestions to the next (if any) - - debugf("AnswerNewLocalOnlyQuestion: Answering %##s (%s)", q->qname.c, DNSTypeName(q->qtype)); - - if (m->CurrentQuestion) - LogMsg("AnswerNewLocalOnlyQuestion ERROR m->CurrentQuestion already set: %##s (%s)", - m->CurrentQuestion->qname.c, DNSTypeName(m->CurrentQuestion->qtype)); - m->CurrentQuestion = q; // Indicate which question we're answering, so we'll know if it gets deleted - - if (m->CurrentRecord) - LogMsg("AnswerNewLocalOnlyQuestion ERROR m->CurrentRecord already set %s", ARDisplayString(m, m->CurrentRecord)); - - // 1. First walk the LocalOnly records answering the LocalOnly question - // 2. As LocalOnly questions should also be answered by any other Auth records local to the machine, - // walk the ResourceRecords list delivering the answers - slot = AuthHashSlot(&q->qname); - ag = AuthGroupForName(&m->rrauth, slot, q->qnamehash, &q->qname); - if (ag) - { - m->CurrentRecord = ag->members; - while (m->CurrentRecord && m->CurrentRecord != ag->NewLocalOnlyRecords) - { - AuthRecord *rr = m->CurrentRecord; - m->CurrentRecord = rr->next; - if (LocalOnlyRecordAnswersQuestion(rr, q)) - { - AnswerLocalQuestionWithLocalAuthRecord(m, rr, mDNStrue); - if (m->CurrentQuestion != q) break; // If callback deleted q, then we're finished here - } - } - } - - if (m->CurrentQuestion == q) - { - m->CurrentRecord = m->ResourceRecords; - - while (m->CurrentRecord && m->CurrentRecord != m->NewLocalRecords) - { - AuthRecord *rr = m->CurrentRecord; - m->CurrentRecord = rr->next; - if (ResourceRecordAnswersQuestion(&rr->resrec, q)) - { - AnswerLocalQuestionWithLocalAuthRecord(m, rr, mDNStrue); - if (m->CurrentQuestion != q) break; // If callback deleted q, then we're finished here - } - } - } - - m->CurrentQuestion = mDNSNULL; - m->CurrentRecord = mDNSNULL; - } - -mDNSlocal CacheEntity *GetCacheEntity(mDNS *const m, const CacheGroup *const PreserveCG) - { - CacheEntity *e = mDNSNULL; - - if (m->lock_rrcache) { LogMsg("GetFreeCacheRR ERROR! Cache already locked!"); return(mDNSNULL); } - m->lock_rrcache = 1; - - // If we have no free records, ask the client layer to give us some more memory - if (!m->rrcache_free && m->MainCallback) - { - if (m->rrcache_totalused != m->rrcache_size) - LogMsg("GetFreeCacheRR: count mismatch: m->rrcache_totalused %lu != m->rrcache_size %lu", - m->rrcache_totalused, m->rrcache_size); - - // We don't want to be vulnerable to a malicious attacker flooding us with an infinite - // number of bogus records so that we keep growing our cache until the machine runs out of memory. - // To guard against this, if our cache grows above 512kB (approx 3168 records at 164 bytes each), - // and we're actively using less than 1/32 of that cache, then we purge all the unused records - // and recycle them, instead of allocating more memory. - if (m->rrcache_size > 5000 && m->rrcache_size / 32 > m->rrcache_active) - LogInfo("Possible denial-of-service attack in progress: m->rrcache_size %lu; m->rrcache_active %lu", - m->rrcache_size, m->rrcache_active); - else - { - mDNS_DropLockBeforeCallback(); // Allow client to legally make mDNS API calls from the callback - m->MainCallback(m, mStatus_GrowCache); - mDNS_ReclaimLockAfterCallback(); // Decrement mDNS_reentrancy to block mDNS API calls again - } - } - - // If we still have no free records, recycle all the records we can. - // Enumerating the entire cache is moderately expensive, so when we do it, we reclaim all the records we can in one pass. - if (!m->rrcache_free) - { - mDNSu32 oldtotalused = m->rrcache_totalused; - mDNSu32 slot; - for (slot = 0; slot < CACHE_HASH_SLOTS; slot++) - { - CacheGroup **cp = &m->rrcache_hash[slot]; - while (*cp) - { - CacheRecord **rp = &(*cp)->members; - while (*rp) - { - // Records that answer still-active questions are not candidates for recycling - // Records that are currently linked into the CacheFlushRecords list may not be recycled, or we'll crash - if ((*rp)->CRActiveQuestion || (*rp)->NextInCFList) - rp=&(*rp)->next; - else - { - CacheRecord *rr = *rp; - *rp = (*rp)->next; // Cut record from list - ReleaseCacheRecord(m, rr); - } - } - if ((*cp)->rrcache_tail != rp) - verbosedebugf("GetFreeCacheRR: Updating rrcache_tail[%lu] from %p to %p", slot, (*cp)->rrcache_tail, rp); - (*cp)->rrcache_tail = rp; - if ((*cp)->members || (*cp)==PreserveCG) cp=&(*cp)->next; - else ReleaseCacheGroup(m, cp); - } - } - LogInfo("GetCacheEntity recycled %d records to reduce cache from %d to %d", - oldtotalused - m->rrcache_totalused, oldtotalused, m->rrcache_totalused); - } - - if (m->rrcache_free) // If there are records in the free list, take one - { - e = m->rrcache_free; - m->rrcache_free = e->next; - if (++m->rrcache_totalused >= m->rrcache_report) - { - LogInfo("RR Cache now using %ld objects", m->rrcache_totalused); - if (m->rrcache_report < 100) m->rrcache_report += 10; - else if (m->rrcache_report < 1000) m->rrcache_report += 100; - else m->rrcache_report += 1000; - } - mDNSPlatformMemZero(e, sizeof(*e)); - } - - m->lock_rrcache = 0; - - return(e); - } - -mDNSlocal CacheRecord *GetCacheRecord(mDNS *const m, CacheGroup *cg, mDNSu16 RDLength) - { - CacheRecord *r = (CacheRecord *)GetCacheEntity(m, cg); - if (r) - { - r->resrec.rdata = (RData*)&r->smallrdatastorage; // By default, assume we're usually going to be using local storage - if (RDLength > InlineCacheRDSize) // If RDLength is too big, allocate extra storage - { - r->resrec.rdata = (RData*)mDNSPlatformMemAllocate(sizeofRDataHeader + RDLength); - if (r->resrec.rdata) r->resrec.rdata->MaxRDLength = r->resrec.rdlength = RDLength; - else { ReleaseCacheEntity(m, (CacheEntity*)r); r = mDNSNULL; } - } - } - return(r); - } - -mDNSlocal CacheGroup *GetCacheGroup(mDNS *const m, const mDNSu32 slot, const ResourceRecord *const rr) - { - mDNSu16 namelen = DomainNameLength(rr->name); - CacheGroup *cg = (CacheGroup*)GetCacheEntity(m, mDNSNULL); - if (!cg) { LogMsg("GetCacheGroup: Failed to allocate memory for %##s", rr->name->c); return(mDNSNULL); } - cg->next = m->rrcache_hash[slot]; - cg->namehash = rr->namehash; - cg->members = mDNSNULL; - cg->rrcache_tail = &cg->members; - cg->name = (domainname*)cg->namestorage; - //LogMsg("GetCacheGroup: %-10s %d-byte cache name %##s", - // (namelen > InlineCacheGroupNameSize) ? "Allocating" : "Inline", namelen, rr->name->c); - if (namelen > InlineCacheGroupNameSize) cg->name = mDNSPlatformMemAllocate(namelen); - if (!cg->name) - { - LogMsg("GetCacheGroup: Failed to allocate name storage for %##s", rr->name->c); - ReleaseCacheEntity(m, (CacheEntity*)cg); - return(mDNSNULL); - } - AssignDomainName(cg->name, rr->name); - - if (CacheGroupForRecord(m, slot, rr)) LogMsg("GetCacheGroup: Already have CacheGroup for %##s", rr->name->c); - m->rrcache_hash[slot] = cg; - if (CacheGroupForRecord(m, slot, rr) != cg) LogMsg("GetCacheGroup: Not finding CacheGroup for %##s", rr->name->c); - - return(cg); - } - -mDNSexport void mDNS_PurgeCacheResourceRecord(mDNS *const m, CacheRecord *rr) - { - if (m->mDNS_busy != m->mDNS_reentrancy+1) - LogMsg("mDNS_PurgeCacheResourceRecord: Lock not held! mDNS_busy (%ld) mDNS_reentrancy (%ld)", m->mDNS_busy, m->mDNS_reentrancy); - // Make sure we mark this record as thoroughly expired -- we don't ever want to give - // a positive answer using an expired record (e.g. from an interface that has gone away). - // We don't want to clear CRActiveQuestion here, because that would leave the record subject to - // summary deletion without giving the proper callback to any questions that are monitoring it. - // By setting UnansweredQueries to MaxUnansweredQueries we ensure it won't trigger any further expiration queries. - rr->TimeRcvd = m->timenow - mDNSPlatformOneSecond * 60; - rr->UnansweredQueries = MaxUnansweredQueries; - rr->resrec.rroriginalttl = 0; - SetNextCacheCheckTimeForRecord(m, rr); - } - -mDNSexport mDNSs32 mDNS_TimeNow(const mDNS *const m) - { - mDNSs32 time; - mDNSPlatformLock(m); - if (m->mDNS_busy) - { - LogMsg("mDNS_TimeNow called while holding mDNS lock. This is incorrect. Code protected by lock should just use m->timenow."); - if (!m->timenow) LogMsg("mDNS_TimeNow: m->mDNS_busy is %ld but m->timenow not set", m->mDNS_busy); - } - - if (m->timenow) time = m->timenow; - else time = mDNS_TimeNow_NoLock(m); - mDNSPlatformUnlock(m); - return(time); - } - -// To avoid pointless CPU thrash, we use SetSPSProxyListChanged(X) to record the last interface that -// had its Sleep Proxy client list change, and defer to actual BPF reconfiguration to mDNS_Execute(). -// (GetNextScheduledEvent() returns "now" when m->SPSProxyListChanged is set) -#define SetSPSProxyListChanged(X) do { \ - if (m->SPSProxyListChanged && m->SPSProxyListChanged != (X)) mDNSPlatformUpdateProxyList(m, m->SPSProxyListChanged); \ - m->SPSProxyListChanged = (X); } while(0) - -// Called from mDNS_Execute() to expire stale proxy records -mDNSlocal void CheckProxyRecords(mDNS *const m, AuthRecord *list) - { - m->CurrentRecord = list; - while (m->CurrentRecord) - { - AuthRecord *rr = m->CurrentRecord; - if (rr->resrec.RecordType != kDNSRecordTypeDeregistering && rr->WakeUp.HMAC.l[0]) - { - // If m->SPSSocket is NULL that means we're not acting as a sleep proxy any more, - // so we need to cease proxying for *all* records we may have, expired or not. - if (m->SPSSocket && m->timenow - rr->TimeExpire < 0) // If proxy record not expired yet, update m->NextScheduledSPS - { - if (m->NextScheduledSPS - rr->TimeExpire > 0) - m->NextScheduledSPS = rr->TimeExpire; - } - else // else proxy record expired, so remove it - { - LogSPS("CheckProxyRecords: Removing %d H-MAC %.6a I-MAC %.6a %d %s", - m->ProxyRecords, &rr->WakeUp.HMAC, &rr->WakeUp.IMAC, rr->WakeUp.seq, ARDisplayString(m, rr)); - SetSPSProxyListChanged(rr->resrec.InterfaceID); - mDNS_Deregister_internal(m, rr, mDNS_Dereg_normal); - // Don't touch rr after this -- memory may have been free'd - } - } - // Mustn't advance m->CurrentRecord until *after* mDNS_Deregister_internal, because - // new records could have been added to the end of the list as a result of that call. - if (m->CurrentRecord == rr) // If m->CurrentRecord was not advanced for us, do it now - m->CurrentRecord = rr->next; - } - } - -mDNSlocal void CheckRmvEventsForLocalRecords(mDNS *const m) - { - while (m->CurrentRecord) - { - AuthRecord *rr = m->CurrentRecord; - if (rr->AnsweredLocalQ && rr->resrec.RecordType == kDNSRecordTypeDeregistering) - { - debugf("CheckRmvEventsForLocalRecords: Generating local RMV events for %s", ARDisplayString(m, rr)); - rr->resrec.RecordType = kDNSRecordTypeShared; - AnswerAllLocalQuestionsWithLocalAuthRecord(m, rr, mDNSfalse); - if (m->CurrentRecord == rr) // If rr still exists in list, restore its state now - { - rr->resrec.RecordType = kDNSRecordTypeDeregistering; - rr->AnsweredLocalQ = mDNSfalse; - // SendResponses normally calls CompleteDeregistration after sending goodbyes. - // For LocalOnly records, we don't do that and hence we need to do that here. - if (RRLocalOnly(rr)) CompleteDeregistration(m, rr); - } - } - if (m->CurrentRecord == rr) // If m->CurrentRecord was not auto-advanced, do it ourselves now - m->CurrentRecord = rr->next; - } - } - -mDNSlocal void TimeoutQuestions(mDNS *const m) - { - m->NextScheduledStopTime = m->timenow + 0x3FFFFFFF; - if (m->CurrentQuestion) - LogMsg("TimeoutQuestions ERROR m->CurrentQuestion already set: %##s (%s)", m->CurrentQuestion->qname.c, - DNSTypeName(m->CurrentQuestion->qtype)); - m->CurrentQuestion = m->Questions; - while (m->CurrentQuestion) - { - DNSQuestion *const q = m->CurrentQuestion; - if (q->StopTime) - { - if (m->timenow - q->StopTime >= 0) - { - LogInfo("TimeoutQuestions: question %##s timed out, time %d", q->qname.c, m->timenow - q->StopTime); - GenerateNegativeResponse(m); - if (m->CurrentQuestion == q) q->StopTime = 0; - } - else - { - if (m->NextScheduledStopTime - q->StopTime > 0) - m->NextScheduledStopTime = q->StopTime; - } - } - // If m->CurrentQuestion wasn't modified out from under us, advance it now - // We can't do this at the start of the loop because GenerateNegativeResponse - // depends on having m->CurrentQuestion point to the right question - if (m->CurrentQuestion == q) - m->CurrentQuestion = q->next; - } - m->CurrentQuestion = mDNSNULL; - } - -mDNSexport mDNSs32 mDNS_Execute(mDNS *const m) - { - mDNS_Lock(m); // Must grab lock before trying to read m->timenow - - if (m->timenow - m->NextScheduledEvent >= 0) - { - int i; - AuthRecord *head, *tail; - mDNSu32 slot; - AuthGroup *ag; - - verbosedebugf("mDNS_Execute"); - - if (m->CurrentQuestion) - LogMsg("mDNS_Execute: ERROR m->CurrentQuestion already set: %##s (%s)", - m->CurrentQuestion->qname.c, DNSTypeName(m->CurrentQuestion->qtype)); - - if (m->CurrentRecord) - LogMsg("mDNS_Execute: ERROR m->CurrentRecord already set: %s", ARDisplayString(m, m->CurrentRecord)); - - // 1. If we're past the probe suppression time, we can clear it - if (m->SuppressProbes && m->timenow - m->SuppressProbes >= 0) m->SuppressProbes = 0; - - // 2. If it's been more than ten seconds since the last probe failure, we can clear the counter - if (m->NumFailedProbes && m->timenow - m->ProbeFailTime >= mDNSPlatformOneSecond * 10) m->NumFailedProbes = 0; - - // 3. Purge our cache of stale old records - if (m->rrcache_size && m->timenow - m->NextCacheCheck >= 0) - { - mDNSu32 numchecked = 0; - m->NextCacheCheck = m->timenow + 0x3FFFFFFF; - for (slot = 0; slot < CACHE_HASH_SLOTS; slot++) - { - if (m->timenow - m->rrcache_nextcheck[slot] >= 0) - { - CacheGroup **cp = &m->rrcache_hash[slot]; - m->rrcache_nextcheck[slot] = m->timenow + 0x3FFFFFFF; - while (*cp) - { - debugf("m->NextCacheCheck %4d Slot %3d %##s", numchecked, slot, *cp ? (*cp)->name : (domainname*)"\x04NULL"); - numchecked++; - CheckCacheExpiration(m, slot, *cp); - if ((*cp)->members) cp=&(*cp)->next; - else ReleaseCacheGroup(m, cp); - } - } - // Even if we didn't need to actually check this slot yet, still need to - // factor its nextcheck time into our overall NextCacheCheck value - if (m->NextCacheCheck - m->rrcache_nextcheck[slot] > 0) - m->NextCacheCheck = m->rrcache_nextcheck[slot]; - } - debugf("m->NextCacheCheck %4d checked, next in %d", numchecked, m->NextCacheCheck - m->timenow); - } - - if (m->timenow - m->NextScheduledSPS >= 0) - { - m->NextScheduledSPS = m->timenow + 0x3FFFFFFF; - CheckProxyRecords(m, m->DuplicateRecords); // Clear m->DuplicateRecords first, then m->ResourceRecords - CheckProxyRecords(m, m->ResourceRecords); - } - - SetSPSProxyListChanged(mDNSNULL); // Perform any deferred BPF reconfiguration now - - // Clear AnnounceOwner if necessary. (Do this *before* SendQueries() and SendResponses().) - if (m->AnnounceOwner && m->timenow - m->AnnounceOwner >= 0) m->AnnounceOwner = 0; - - if (m->DelaySleep && m->timenow - m->DelaySleep >= 0) - { - m->DelaySleep = 0; - if (m->SleepState == SleepState_Transferring) - { - LogSPS("Re-sleep delay passed; now checking for Sleep Proxy Servers"); - BeginSleepProcessing(m); - } - } - - // 4. See if we can answer any of our new local questions from the cache - for (i=0; m->NewQuestions && i<1000; i++) - { - if (m->NewQuestions->DelayAnswering && m->timenow - m->NewQuestions->DelayAnswering < 0) break; - AnswerNewQuestion(m); - } - if (i >= 1000) LogMsg("mDNS_Execute: AnswerNewQuestion exceeded loop limit"); - - // Make sure we deliver *all* local RMV events, and clear the corresponding rr->AnsweredLocalQ flags, *before* - // we begin generating *any* new ADD events in the m->NewLocalOnlyQuestions and m->NewLocalRecords loops below. - for (i=0; i<1000 && m->LocalRemoveEvents; i++) - { - m->LocalRemoveEvents = mDNSfalse; - m->CurrentRecord = m->ResourceRecords; - CheckRmvEventsForLocalRecords(m); - // Walk the LocalOnly records and deliver the RMV events - for (slot = 0; slot < AUTH_HASH_SLOTS; slot++) - for (ag = m->rrauth.rrauth_hash[slot]; ag; ag = ag->next) - { - m->CurrentRecord = ag->members; - if (m->CurrentRecord) CheckRmvEventsForLocalRecords(m); - } - } - - if (i >= 1000) LogMsg("mDNS_Execute: m->LocalRemoveEvents exceeded loop limit"); - - for (i=0; m->NewLocalOnlyQuestions && i<1000; i++) AnswerNewLocalOnlyQuestion(m); - if (i >= 1000) LogMsg("mDNS_Execute: AnswerNewLocalOnlyQuestion exceeded loop limit"); - - head = tail = mDNSNULL; - for (i=0; i<1000 && m->NewLocalRecords && m->NewLocalRecords != head; i++) - { - AuthRecord *rr = m->NewLocalRecords; - m->NewLocalRecords = m->NewLocalRecords->next; - if (LocalRecordReady(rr)) - { - debugf("mDNS_Execute: Delivering Add event with LocalAuthRecord %s", ARDisplayString(m, rr)); - AnswerAllLocalQuestionsWithLocalAuthRecord(m, rr, mDNStrue); - } - else if (!rr->next) - { - // If we have just one record that is not ready, we don't have to unlink and - // reinsert. As the NewLocalRecords will be NULL for this case, the loop will - // terminate and set the NewLocalRecords to rr. - debugf("mDNS_Execute: Just one LocalAuthRecord %s, breaking out of the loop early", ARDisplayString(m, rr)); - if (head != mDNSNULL || m->NewLocalRecords != mDNSNULL) - LogMsg("mDNS_Execute: ERROR!!: head %p, NewLocalRecords %p", head, m->NewLocalRecords); - - head = rr; - } - else - { - AuthRecord **p = &m->ResourceRecords; // Find this record in our list of active records - debugf("mDNS_Execute: Skipping LocalAuthRecord %s", ARDisplayString(m, rr)); - // if this is the first record we are skipping, move to the end of the list. - // if we have already skipped records before, append it at the end. - while (*p && *p != rr) p=&(*p)->next; - if (*p) *p = rr->next; // Cut this record from the list - else { LogMsg("mDNS_Execute: ERROR!! Cannot find record %s in ResourceRecords list", ARDisplayString(m, rr)); break; } - if (!head) - { - while (*p) p=&(*p)->next; - *p = rr; - head = tail = rr; - } - else - { - tail->next = rr; - tail = rr; - } - rr->next = mDNSNULL; - } - } - m->NewLocalRecords = head; - debugf("mDNS_Execute: Setting NewLocalRecords to %s", (head ? ARDisplayString(m, head) : "NULL")); - - if (i >= 1000) LogMsg("mDNS_Execute: m->NewLocalRecords exceeded loop limit"); - - // Check to see if we have any new LocalOnly/P2P records to examine for delivering - // to our local questions - if (m->NewLocalOnlyRecords) - { - m->NewLocalOnlyRecords = mDNSfalse; - for (slot = 0; slot < AUTH_HASH_SLOTS; slot++) - for (ag = m->rrauth.rrauth_hash[slot]; ag; ag = ag->next) - { - for (i=0; i<100 && ag->NewLocalOnlyRecords; i++) - { - AuthRecord *rr = ag->NewLocalOnlyRecords; - ag->NewLocalOnlyRecords = ag->NewLocalOnlyRecords->next; - // LocalOnly records should always be ready as they never probe - if (LocalRecordReady(rr)) - { - debugf("mDNS_Execute: Delivering Add event with LocalAuthRecord %s", ARDisplayString(m, rr)); - AnswerAllLocalQuestionsWithLocalAuthRecord(m, rr, mDNStrue); - } - else LogMsg("mDNS_Execute: LocalOnlyRecord %s not ready", ARDisplayString(m, rr)); - } - // We limit about 100 per AuthGroup that can be serviced at a time - if (i >= 100) LogMsg("mDNS_Execute: ag->NewLocalOnlyRecords exceeded loop limit"); - } - } - - // 5. Some questions may have picked a new DNS server and the cache may answer these questions now. - AnswerQuestionsForDNSServerChanges(m); - - // 6. See what packets we need to send - if (m->mDNSPlatformStatus != mStatus_NoError || (m->SleepState == SleepState_Sleeping)) - DiscardDeregistrations(m); - if (m->mDNSPlatformStatus == mStatus_NoError && (m->SuppressSending == 0 || m->timenow - m->SuppressSending >= 0)) - { - // If the platform code is ready, and we're not suppressing packet generation right now - // then send our responses, probes, and questions. - // We check the cache first, because there might be records close to expiring that trigger questions to refresh them. - // We send queries next, because there might be final-stage probes that complete their probing here, causing - // them to advance to announcing state, and we want those to be included in any announcements we send out. - // Finally, we send responses, including the previously mentioned records that just completed probing. - m->SuppressSending = 0; - - // 7. Send Query packets. This may cause some probing records to advance to announcing state - if (m->timenow - m->NextScheduledQuery >= 0 || m->timenow - m->NextScheduledProbe >= 0) SendQueries(m); - if (m->timenow - m->NextScheduledQuery >= 0) - { - DNSQuestion *q; - LogMsg("mDNS_Execute: SendQueries didn't send all its queries (%d - %d = %d) will try again in one second", - m->timenow, m->NextScheduledQuery, m->timenow - m->NextScheduledQuery); - m->NextScheduledQuery = m->timenow + mDNSPlatformOneSecond; - for (q = m->Questions; q && q != m->NewQuestions; q=q->next) - if (ActiveQuestion(q) && m->timenow - NextQSendTime(q) >= 0) - LogMsg("mDNS_Execute: SendQueries didn't send %##s (%s)", q->qname.c, DNSTypeName(q->qtype)); - } - if (m->timenow - m->NextScheduledProbe >= 0) - { - LogMsg("mDNS_Execute: SendQueries didn't send all its probes (%d - %d = %d) will try again in one second", - m->timenow, m->NextScheduledProbe, m->timenow - m->NextScheduledProbe); - m->NextScheduledProbe = m->timenow + mDNSPlatformOneSecond; - } - - // 8. Send Response packets, including probing records just advanced to announcing state - if (m->timenow - m->NextScheduledResponse >= 0) SendResponses(m); - if (m->timenow - m->NextScheduledResponse >= 0) - { - LogMsg("mDNS_Execute: SendResponses didn't send all its responses; will try again in one second"); - m->NextScheduledResponse = m->timenow + mDNSPlatformOneSecond; - } - } - - // Clear RandomDelay values, ready to pick a new different value next time - m->RandomQueryDelay = 0; - m->RandomReconfirmDelay = 0; - - if (m->NextScheduledStopTime && m->timenow - m->NextScheduledStopTime >= 0) TimeoutQuestions(m); -#ifndef UNICAST_DISABLED - if (m->NextSRVUpdate && m->timenow - m->NextSRVUpdate >= 0) UpdateAllSRVRecords(m); - if (m->timenow - m->NextScheduledNATOp >= 0) CheckNATMappings(m); - if (m->timenow - m->NextuDNSEvent >= 0) uDNS_Tasks(m); -#endif - } - - // Note about multi-threaded systems: - // On a multi-threaded system, some other thread could run right after the mDNS_Unlock(), - // performing mDNS API operations that change our next scheduled event time. - // - // On multi-threaded systems (like the current Windows implementation) that have a single main thread - // calling mDNS_Execute() (and other threads allowed to call mDNS API routines) it is the responsibility - // of the mDNSPlatformUnlock() routine to signal some kind of stateful condition variable that will - // signal whatever blocking primitive the main thread is using, so that it will wake up and execute one - // more iteration of its loop, and immediately call mDNS_Execute() again. The signal has to be stateful - // in the sense that if the main thread has not yet entered its blocking primitive, then as soon as it - // does, the state of the signal will be noticed, causing the blocking primitive to return immediately - // without blocking. This avoids the race condition between the signal from the other thread arriving - // just *before* or just *after* the main thread enters the blocking primitive. - // - // On multi-threaded systems (like the current Mac OS 9 implementation) that are entirely timer-driven, - // with no main mDNS_Execute() thread, it is the responsibility of the mDNSPlatformUnlock() routine to - // set the timer according to the m->NextScheduledEvent value, and then when the timer fires, the timer - // callback function should call mDNS_Execute() (and ignore the return value, which may already be stale - // by the time it gets to the timer callback function). - - mDNS_Unlock(m); // Calling mDNS_Unlock is what gives m->NextScheduledEvent its new value - return(m->NextScheduledEvent); - } - -mDNSlocal void SuspendLLQs(mDNS *m) - { - DNSQuestion *q; - for (q = m->Questions; q; q = q->next) - if (ActiveQuestion(q) && !mDNSOpaque16IsZero(q->TargetQID) && q->LongLived && q->state == LLQ_Established) - { q->ReqLease = 0; sendLLQRefresh(m, q); } - } - -mDNSlocal mDNSBool QuestionHasLocalAnswers(mDNS *const m, DNSQuestion *q) - { - AuthRecord *rr; - mDNSu32 slot; - AuthGroup *ag; - - slot = AuthHashSlot(&q->qname); - ag = AuthGroupForName(&m->rrauth, slot, q->qnamehash, &q->qname); - if (ag) - { - for (rr = ag->members; rr; rr=rr->next) - // Filter the /etc/hosts records - LocalOnly, Unique, A/AAAA/CNAME - if (LORecordAnswersAddressType(rr) && LocalOnlyRecordAnswersQuestion(rr, q)) - { - LogInfo("QuestionHasLocalAnswers: Question %p %##s (%s) has local answer %s", q, q->qname.c, DNSTypeName(q->qtype), ARDisplayString(m, rr)); - return mDNStrue; - } - } - return mDNSfalse; - } - -// ActivateUnicastQuery() is called from three places: -// 1. When a new question is created -// 2. On wake from sleep -// 3. When the DNS configuration changes -// In case 1 we don't want to mess with our established ThisQInterval and LastQTime (ScheduleImmediately is false) -// In cases 2 and 3 we do want to cause the question to be resent immediately (ScheduleImmediately is true) -mDNSlocal void ActivateUnicastQuery(mDNS *const m, DNSQuestion *const question, mDNSBool ScheduleImmediately) - { - // For now this AutoTunnel stuff is specific to Mac OS X. - // In the future, if there's demand, we may see if we can abstract it out cleanly into the platform layer -#if APPLE_OSX_mDNSResponder - // Even though BTMM client tunnels are only useful for AAAA queries, we need to treat v4 and v6 queries equally. - // Otherwise we can get the situation where the A query completes really fast (with an NXDOMAIN result) and the - // caller then gives up waiting for the AAAA result while we're still in the process of setting up the tunnel. - // To level the playing field, we block both A and AAAA queries while tunnel setup is in progress, and then - // returns results for both at the same time. If we are looking for the _autotunnel6 record, then skip this logic - // as this would trigger looking up _autotunnel6._autotunnel6 and end up failing the original query. - - if (RRTypeIsAddressType(question->qtype) && PrivateQuery(question) && - !SameDomainLabel(question->qname.c, (const mDNSu8 *)"\x0c_autotunnel6")&& question->QuestionCallback != AutoTunnelCallback) - { - question->NoAnswer = NoAnswer_Suspended; - AddNewClientTunnel(m, question); - return; - } -#endif // APPLE_OSX_mDNSResponder - - if (!question->DuplicateOf) - { - debugf("ActivateUnicastQuery: %##s %s%s%s", - question->qname.c, DNSTypeName(question->qtype), PrivateQuery(question) ? " (Private)" : "", ScheduleImmediately ? " ScheduleImmediately" : ""); - question->CNAMEReferrals = 0; - if (question->nta) { CancelGetZoneData(m, question->nta); question->nta = mDNSNULL; } - if (question->LongLived) - { - question->state = LLQ_InitialRequest; - question->id = zeroOpaque64; - question->servPort = zeroIPPort; - if (question->tcp) { DisposeTCPConn(question->tcp); question->tcp = mDNSNULL; } - } - // If the question has local answers, then we don't want answers from outside - if (ScheduleImmediately && !QuestionHasLocalAnswers(m, question)) - { - question->ThisQInterval = InitialQuestionInterval; - question->LastQTime = m->timenow - question->ThisQInterval; - SetNextQueryTime(m, question); - } - } - } - -// Caller should hold the lock -mDNSexport void mDNSCoreRestartAddressQueries(mDNS *const m, mDNSBool SearchDomainsChanged, FlushCache flushCacheRecords, - CallbackBeforeStartQuery BeforeStartCallback, void *context) - { - DNSQuestion *q; - DNSQuestion *restart = mDNSNULL; - - if (!m->mDNS_busy) LogMsg("mDNSCoreRestartAddressQueries: ERROR!! Lock not held"); - - // 1. Flush the cache records - if (flushCacheRecords) flushCacheRecords(m); - - // 2. Even though we may have purged the cache records above, before it can generate RMV event - // we are going to stop the question. Hence we need to deliver the RMV event before we - // stop the question. - // - // CurrentQuestion is used by RmvEventsForQuestion below. While delivering RMV events, the - // application callback can potentially stop the current question (detected by CurrentQuestion) or - // *any* other question which could be the next one that we may process here. RestartQuestion - // points to the "next" question which will be automatically advanced in mDNS_StopQuery_internal - // if the "next" question is stopped while the CurrentQuestion is stopped - - if (m->RestartQuestion) - LogMsg("mDNSCoreRestartAddressQueries: ERROR!! m->RestartQuestion already set: %##s (%s)", - m->RestartQuestion->qname.c, DNSTypeName(m->RestartQuestion->qtype)); - - m->RestartQuestion = m->Questions; - while (m->RestartQuestion) - { - q = m->RestartQuestion; - m->RestartQuestion = q->next; - // GetZoneData questions are referenced by other questions (original query that started the GetZoneData - // question) through their "nta" pointer. Normally when the original query stops, it stops the - // GetZoneData question and also frees the memory (See CancelGetZoneData). If we stop the GetZoneData - // question followed by the original query that refers to this GetZoneData question, we will end up - // freeing the GetZoneData question and then start the "freed" question at the end. - - if (IsGetZoneDataQuestion(q)) - { - DNSQuestion *refq = q->next; - LogInfo("mDNSCoreRestartAddressQueries: Skipping GetZoneDataQuestion %p %##s (%s)", q, q->qname.c, DNSTypeName(q->qtype)); - // debug stuff, we just try to find the referencing question and don't do much with it - while (refq) - { - if (q == &refq->nta->question) - { - LogInfo("mDNSCoreRestartAddressQueries: Question %p %##s (%s) referring to GetZoneDataQuestion %p, not stopping", refq, refq->qname.c, DNSTypeName(refq->qtype), q); - } - refq = refq->next; - } - continue; - } - - // This function is called when /etc/hosts changes and that could affect A, AAAA and CNAME queries - if (q->qtype != kDNSType_A && q->qtype != kDNSType_AAAA && q->qtype != kDNSType_CNAME) continue; - - // If the search domains did not change, then we restart all the queries. Otherwise, only - // for queries for which we "might" have appended search domains ("might" because we may - // find results before we apply search domains even though AppendSearchDomains is set to 1) - if (!SearchDomainsChanged || q->AppendSearchDomains) - { - // NOTE: CacheRecordRmvEventsForQuestion will not generate RMV events for queries that have non-zero - // LOAddressAnswers. Hence it is important that we call CacheRecordRmvEventsForQuestion before - // LocalRecordRmvEventsForQuestion (which decrements LOAddressAnswers). Let us say that - // /etc/hosts has an A Record for web.apple.com. Any queries for web.apple.com will be answered locally. - // But this can't prevent a CNAME/AAAA query to not to be sent on the wire. When it is sent on the wire, - // it could create cache entries. When we are restarting queries, we can't deliver the cache RMV events - // for the original query using these cache entries as ADDs were never delivered using these cache - // entries and hence this order is needed. - - // If the query is suppressed, the RMV events won't be delivered - if (!CacheRecordRmvEventsForQuestion(m, q)) { LogInfo("mDNSCoreRestartAddressQueries: Question deleted while delivering Cache Record RMV events"); continue; } - - // SuppressQuery status does not affect questions that are answered using local records - if (!LocalRecordRmvEventsForQuestion(m, q)) { LogInfo("mDNSCoreRestartAddressQueries: Question deleted while delivering Local Record RMV events"); continue; } - - LogInfo("mDNSCoreRestartAddressQueries: Stop question %p %##s (%s), AppendSearchDomains %d, qnameOrig %p", q, - q->qname.c, DNSTypeName(q->qtype), q->AppendSearchDomains, q->qnameOrig); - mDNS_StopQuery_internal(m, q); - // Reset state so that it looks like it was in the beginning i.e it should look at /etc/hosts, cache - // and then search domains should be appended. At the beginning, qnameOrig was NULL. - if (q->qnameOrig) - { - LogInfo("mDNSCoreRestartAddressQueries: qnameOrig %##s", q->qnameOrig); - AssignDomainName(&q->qname, q->qnameOrig); - mDNSPlatformMemFree(q->qnameOrig); - q->qnameOrig = mDNSNULL; - q->RetryWithSearchDomains = ApplySearchDomainsFirst(q) ? 1 : 0; - } - q->SearchListIndex = 0; - q->next = restart; - restart = q; - } - } - - // 3. Callback before we start the query - if (BeforeStartCallback) BeforeStartCallback(m, context); - - // 4. Restart all the stopped queries - while (restart) - { - q = restart; - restart = restart->next; - q->next = mDNSNULL; - LogInfo("mDNSCoreRestartAddressQueries: Start question %p %##s (%s)", q, q->qname.c, DNSTypeName(q->qtype)); - mDNS_StartQuery_internal(m, q); - } - } - -mDNSexport void mDNSCoreRestartQueries(mDNS *const m) - { - DNSQuestion *q; - -#ifndef UNICAST_DISABLED - // Retrigger all our uDNS questions - if (m->CurrentQuestion) - LogMsg("mDNSCoreRestartQueries: ERROR m->CurrentQuestion already set: %##s (%s)", - m->CurrentQuestion->qname.c, DNSTypeName(m->CurrentQuestion->qtype)); - m->CurrentQuestion = m->Questions; - while (m->CurrentQuestion) - { - q = m->CurrentQuestion; - m->CurrentQuestion = m->CurrentQuestion->next; - if (!mDNSOpaque16IsZero(q->TargetQID) && ActiveQuestion(q)) ActivateUnicastQuery(m, q, mDNStrue); - } -#endif - - // Retrigger all our mDNS questions - for (q = m->Questions; q; q=q->next) // Scan our list of questions - if (mDNSOpaque16IsZero(q->TargetQID) && ActiveQuestion(q)) - { - q->ThisQInterval = InitialQuestionInterval; // MUST be > zero for an active question - q->RequestUnicast = 2; // Set to 2 because is decremented once *before* we check it - q->LastQTime = m->timenow - q->ThisQInterval; - q->RecentAnswerPkts = 0; - ExpireDupSuppressInfo(q->DupSuppress, m->timenow); - m->NextScheduledQuery = m->timenow; - } - } - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - Power Management (Sleep/Wake) -#endif - -mDNSexport void mDNS_UpdateAllowSleep(mDNS *const m) - { -#ifndef IDLESLEEPCONTROL_DISABLED - mDNSBool allowSleep = mDNStrue; - char reason[128]; - - reason[0] = 0; - - if (m->SystemSleepOnlyIfWakeOnLAN) - { - // Don't sleep if we are a proxy for any services - if (m->ProxyRecords) - { - allowSleep = mDNSfalse; - mDNS_snprintf(reason, sizeof(reason), "sleep proxy for %d records", m->ProxyRecords); - LogInfo("Sleep disabled because we are proxying %d records", m->ProxyRecords); - } - - if (allowSleep && mDNSCoreHaveAdvertisedMulticastServices(m)) - { - // Scan the list of active interfaces - NetworkInterfaceInfo *intf; - for (intf = GetFirstActiveInterface(m->HostInterfaces); intf; intf = GetFirstActiveInterface(intf->next)) - { - if (intf->McastTxRx && !intf->Loopback) - { - // Disallow sleep if this interface doesn't support NetWake - if (!intf->NetWake) - { - allowSleep = mDNSfalse; - mDNS_snprintf(reason, sizeof(reason), "%s does not support NetWake", intf->ifname); - LogInfo("Sleep disabled because %s does not support NetWake", intf->ifname); - break; - } - - // Disallow sleep if there is no sleep proxy server - if (FindSPSInCache1(m, &intf->NetWakeBrowse, mDNSNULL, mDNSNULL) == mDNSNULL) - { - allowSleep = mDNSfalse; - mDNS_snprintf(reason, sizeof(reason), "%s does not support NetWake", intf->ifname); - LogInfo("Sleep disabled because %s has no sleep proxy", intf->ifname); - break; - } - } - } - } - } - - // Call the platform code to enable/disable sleep - mDNSPlatformSetAllowSleep(m, allowSleep, reason); -#endif /* !defined(IDLESLEEPCONTROL_DISABLED) */ - } - -mDNSlocal void SendSPSRegistrationForOwner(mDNS *const m, NetworkInterfaceInfo *const intf, const mDNSOpaque16 id, const OwnerOptData *const owner) - { - const int optspace = DNSOpt_Header_Space + DNSOpt_LeaseData_Space + DNSOpt_Owner_Space(&m->PrimaryMAC, &intf->MAC); - const int sps = intf->NextSPSAttempt / 3; - AuthRecord *rr; - - if (!intf->SPSAddr[sps].type) - { - intf->NextSPSAttemptTime = m->timenow + mDNSPlatformOneSecond; - if (m->NextScheduledSPRetry - intf->NextSPSAttemptTime > 0) - m->NextScheduledSPRetry = intf->NextSPSAttemptTime; - LogSPS("SendSPSRegistration: %s SPS %d (%d) %##s not yet resolved", intf->ifname, intf->NextSPSAttempt, sps, intf->NetWakeResolve[sps].qname.c); - goto exit; - } - - // Mark our mDNS records (not unicast records) for transfer to SPS - if (mDNSOpaque16IsZero(id)) - for (rr = m->ResourceRecords; rr; rr=rr->next) - if (rr->resrec.RecordType > kDNSRecordTypeDeregistering) - if (rr->resrec.InterfaceID == intf->InterfaceID || (!rr->resrec.InterfaceID && (rr->ForceMCast || IsLocalDomain(rr->resrec.name)))) - if (mDNSPlatformMemSame(owner, &rr->WakeUp, sizeof(*owner))) - rr->SendRNow = mDNSInterfaceMark; // mark it now - - while (1) - { - mDNSu8 *p = m->omsg.data; - // To comply with RFC 2782, PutResourceRecord suppresses name compression for SRV records in unicast updates. - // For now we follow that same logic for SPS registrations too. - // If we decide to compress SRV records in SPS registrations in the future, we can achieve that by creating our - // initial DNSMessage with h.flags set to zero, and then update it to UpdateReqFlags right before sending the packet. - InitializeDNSMessage(&m->omsg.h, mDNSOpaque16IsZero(id) ? mDNS_NewMessageID(m) : id, UpdateReqFlags); - - for (rr = m->ResourceRecords; rr; rr=rr->next) - if (rr->SendRNow || (!mDNSOpaque16IsZero(id) && !AuthRecord_uDNS(rr) && mDNSSameOpaque16(rr->updateid, id) && m->timenow - (rr->LastAPTime + rr->ThisAPInterval) >= 0)) - if (mDNSPlatformMemSame(owner, &rr->WakeUp, sizeof(*owner))) - { - mDNSu8 *newptr; - const mDNSu8 *const limit = m->omsg.data + (m->omsg.h.mDNS_numUpdates ? NormalMaxDNSMessageData : AbsoluteMaxDNSMessageData) - optspace; - if (rr->resrec.RecordType & kDNSRecordTypeUniqueMask) - rr->resrec.rrclass |= kDNSClass_UniqueRRSet; // Temporarily set the 'unique' bit so PutResourceRecord will set it - newptr = PutResourceRecordTTLWithLimit(&m->omsg, p, &m->omsg.h.mDNS_numUpdates, &rr->resrec, rr->resrec.rroriginalttl, limit); - rr->resrec.rrclass &= ~kDNSClass_UniqueRRSet; // Make sure to clear 'unique' bit back to normal state - if (!newptr) - LogSPS("SendSPSRegistration put %s FAILED %d/%d %s", intf->ifname, p - m->omsg.data, limit - m->omsg.data, ARDisplayString(m, rr)); - else - { - LogSPS("SendSPSRegistration put %s %s", intf->ifname, ARDisplayString(m, rr)); - rr->SendRNow = mDNSNULL; - rr->ThisAPInterval = mDNSPlatformOneSecond; - rr->LastAPTime = m->timenow; - rr->updateid = m->omsg.h.id; - if (m->NextScheduledResponse - (rr->LastAPTime + rr->ThisAPInterval) >= 0) - m->NextScheduledResponse = (rr->LastAPTime + rr->ThisAPInterval); - p = newptr; - } - } - - if (!m->omsg.h.mDNS_numUpdates) break; - else - { - AuthRecord opt; - mDNS_SetupResourceRecord(&opt, mDNSNULL, mDNSInterface_Any, kDNSType_OPT, kStandardTTL, kDNSRecordTypeKnownUnique, AuthRecordAny, mDNSNULL, mDNSNULL); - opt.resrec.rrclass = NormalMaxDNSMessageData; - opt.resrec.rdlength = sizeof(rdataOPT) * 2; // Two options in this OPT record - opt.resrec.rdestimate = sizeof(rdataOPT) * 2; - opt.resrec.rdata->u.opt[0].opt = kDNSOpt_Lease; - opt.resrec.rdata->u.opt[0].optlen = DNSOpt_LeaseData_Space - 4; - opt.resrec.rdata->u.opt[0].u.updatelease = DEFAULT_UPDATE_LEASE; - if (!owner->HMAC.l[0]) // If no owner data, - SetupOwnerOpt(m, intf, &opt.resrec.rdata->u.opt[1]); // use our own interface information - else // otherwise, use the owner data we were given - { - opt.resrec.rdata->u.opt[1].u.owner = *owner; - opt.resrec.rdata->u.opt[1].opt = kDNSOpt_Owner; - opt.resrec.rdata->u.opt[1].optlen = DNSOpt_Owner_Space(&owner->HMAC, &owner->IMAC) - 4; - } - LogSPS("SendSPSRegistration put %s %s", intf->ifname, ARDisplayString(m, &opt)); - p = PutResourceRecordTTLWithLimit(&m->omsg, p, &m->omsg.h.numAdditionals, &opt.resrec, opt.resrec.rroriginalttl, m->omsg.data + AbsoluteMaxDNSMessageData); - if (!p) - LogMsg("SendSPSRegistration: Failed to put OPT record (%d updates) %s", m->omsg.h.mDNS_numUpdates, ARDisplayString(m, &opt)); - else - { - mStatus err; - - LogSPS("SendSPSRegistration: Sending Update %s %d (%d) id %5d with %d records %d bytes to %#a:%d", intf->ifname, intf->NextSPSAttempt, sps, - mDNSVal16(m->omsg.h.id), m->omsg.h.mDNS_numUpdates, p - m->omsg.data, &intf->SPSAddr[sps], mDNSVal16(intf->SPSPort[sps])); - // if (intf->NextSPSAttempt < 5) m->omsg.h.flags = zeroID; // For simulating packet loss - err = mDNSSendDNSMessage(m, &m->omsg, p, intf->InterfaceID, mDNSNULL, &intf->SPSAddr[sps], intf->SPSPort[sps], mDNSNULL, mDNSNULL); - if (err) LogSPS("SendSPSRegistration: mDNSSendDNSMessage err %d", err); - if (err && intf->SPSAddr[sps].type == mDNSAddrType_IPv6 && intf->NetWakeResolve[sps].ThisQInterval == -1) - { - LogSPS("SendSPSRegistration %d %##s failed to send to IPv6 address; will try IPv4 instead", sps, intf->NetWakeResolve[sps].qname.c); - intf->NetWakeResolve[sps].qtype = kDNSType_A; - mDNS_StartQuery_internal(m, &intf->NetWakeResolve[sps]); - return; - } - } - } - } - - intf->NextSPSAttemptTime = m->timenow + mDNSPlatformOneSecond * 10; // If successful, update NextSPSAttemptTime - -exit: - if (mDNSOpaque16IsZero(id) && intf->NextSPSAttempt < 8) intf->NextSPSAttempt++; - } - -mDNSlocal mDNSBool RecordIsFirstOccurrenceOfOwner(mDNS *const m, const AuthRecord *const rr) - { - AuthRecord *ar; - for (ar = m->ResourceRecords; ar && ar != rr; ar=ar->next) - if (mDNSPlatformMemSame(&rr->WakeUp, &ar->WakeUp, sizeof(rr->WakeUp))) return mDNSfalse; - return mDNStrue; - } - -mDNSlocal void SendSPSRegistration(mDNS *const m, NetworkInterfaceInfo *const intf, const mDNSOpaque16 id) - { - AuthRecord *ar; - OwnerOptData owner = zeroOwner; - - SendSPSRegistrationForOwner(m, intf, id, &owner); - - for (ar = m->ResourceRecords; ar; ar=ar->next) - { - if (!mDNSPlatformMemSame(&owner, &ar->WakeUp, sizeof(owner)) && RecordIsFirstOccurrenceOfOwner(m, ar)) - { - owner = ar->WakeUp; - SendSPSRegistrationForOwner(m, intf, id, &owner); - } - } - } - -// RetrySPSRegistrations is called from SendResponses, with the lock held -mDNSlocal void RetrySPSRegistrations(mDNS *const m) - { - AuthRecord *rr; - NetworkInterfaceInfo *intf; - - // First make sure none of our interfaces' NextSPSAttemptTimes are inadvertently set to m->timenow + mDNSPlatformOneSecond * 10 - for (intf = GetFirstActiveInterface(m->HostInterfaces); intf; intf = GetFirstActiveInterface(intf->next)) - if (intf->NextSPSAttempt && intf->NextSPSAttemptTime == m->timenow + mDNSPlatformOneSecond * 10) - intf->NextSPSAttemptTime++; - - // Retry any record registrations that are due - for (rr = m->ResourceRecords; rr; rr=rr->next) - if (!AuthRecord_uDNS(rr) && !mDNSOpaque16IsZero(rr->updateid) && m->timenow - (rr->LastAPTime + rr->ThisAPInterval) >= 0) - for (intf = GetFirstActiveInterface(m->HostInterfaces); intf; intf = GetFirstActiveInterface(intf->next)) - if (!rr->resrec.InterfaceID || rr->resrec.InterfaceID == intf->InterfaceID) - { - LogSPS("RetrySPSRegistrations: %s", ARDisplayString(m, rr)); - SendSPSRegistration(m, intf, rr->updateid); - } - - // For interfaces where we did an SPS registration attempt, increment intf->NextSPSAttempt - for (intf = GetFirstActiveInterface(m->HostInterfaces); intf; intf = GetFirstActiveInterface(intf->next)) - if (intf->NextSPSAttempt && intf->NextSPSAttemptTime == m->timenow + mDNSPlatformOneSecond * 10 && intf->NextSPSAttempt < 8) - intf->NextSPSAttempt++; - } - -mDNSlocal void NetWakeResolve(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, QC_result AddRecord) - { - NetworkInterfaceInfo *intf = (NetworkInterfaceInfo *)question->QuestionContext; - int sps = (int)(question - intf->NetWakeResolve); - (void)m; // Unused - LogSPS("NetWakeResolve: SPS: %d Add: %d %s", sps, AddRecord, RRDisplayString(m, answer)); - - if (!AddRecord) return; // Don't care about REMOVE events - if (answer->rrtype != question->qtype) return; // Don't care about CNAMEs - - // if (answer->rrtype == kDNSType_AAAA && sps == 0) return; // To test failing to resolve sleep proxy's address - - if (answer->rrtype == kDNSType_SRV) - { - // 1. Got the SRV record; now look up the target host's IPv6 link-local address - mDNS_StopQuery(m, question); - intf->SPSPort[sps] = answer->rdata->u.srv.port; - AssignDomainName(&question->qname, &answer->rdata->u.srv.target); - question->qtype = kDNSType_AAAA; - mDNS_StartQuery(m, question); - } - else if (answer->rrtype == kDNSType_AAAA && answer->rdlength == sizeof(mDNSv6Addr) && mDNSv6AddressIsLinkLocal(&answer->rdata->u.ipv6)) - { - // 2. Got the target host's IPv6 link-local address; record address and initiate an SPS registration if appropriate - mDNS_StopQuery(m, question); - question->ThisQInterval = -1; - intf->SPSAddr[sps].type = mDNSAddrType_IPv6; - intf->SPSAddr[sps].ip.v6 = answer->rdata->u.ipv6; - mDNS_Lock(m); - if (sps == intf->NextSPSAttempt/3) SendSPSRegistration(m, intf, zeroID); // If we're ready for this result, use it now - mDNS_Unlock(m); - } - else if (answer->rrtype == kDNSType_AAAA && answer->rdlength == 0) - { - // 3. Got negative response -- target host apparently has IPv6 disabled -- so try looking up the target host's IPv4 address(es) instead - mDNS_StopQuery(m, question); - LogSPS("NetWakeResolve: SPS %d %##s has no IPv6 address, will try IPv4 instead", sps, question->qname.c); - question->qtype = kDNSType_A; - mDNS_StartQuery(m, question); - } - else if (answer->rrtype == kDNSType_A && answer->rdlength == sizeof(mDNSv4Addr)) - { - // 4. Got an IPv4 address for the target host; record address and initiate an SPS registration if appropriate - mDNS_StopQuery(m, question); - question->ThisQInterval = -1; - intf->SPSAddr[sps].type = mDNSAddrType_IPv4; - intf->SPSAddr[sps].ip.v4 = answer->rdata->u.ipv4; - mDNS_Lock(m); - if (sps == intf->NextSPSAttempt/3) SendSPSRegistration(m, intf, zeroID); // If we're ready for this result, use it now - mDNS_Unlock(m); - } - } - -mDNSexport mDNSBool mDNSCoreHaveAdvertisedMulticastServices(mDNS *const m) - { - AuthRecord *rr; - for (rr = m->ResourceRecords; rr; rr=rr->next) - if (rr->resrec.rrtype == kDNSType_SRV && !AuthRecord_uDNS(rr) && !mDNSSameIPPort(rr->resrec.rdata->u.srv.port, DiscardPort)) - return mDNStrue; - return mDNSfalse; - } - -mDNSlocal void SendSleepGoodbyes(mDNS *const m) - { - AuthRecord *rr; - m->SleepState = SleepState_Sleeping; - -#ifndef UNICAST_DISABLED - SleepRecordRegistrations(m); // If we have no SPS, need to deregister our uDNS records -#endif /* UNICAST_DISABLED */ - - // Mark all the records we need to deregister and send them - for (rr = m->ResourceRecords; rr; rr=rr->next) - if (rr->resrec.RecordType == kDNSRecordTypeShared && rr->RequireGoodbye) - rr->ImmedAnswer = mDNSInterfaceMark; - SendResponses(m); - } - -// BeginSleepProcessing is called, with the lock held, from either mDNS_Execute or mDNSCoreMachineSleep -mDNSlocal void BeginSleepProcessing(mDNS *const m) - { - mDNSBool SendGoodbyes = mDNStrue; - const CacheRecord *sps[3] = { mDNSNULL }; - - m->NextScheduledSPRetry = m->timenow; - - if (!m->SystemWakeOnLANEnabled) LogSPS("BeginSleepProcessing: m->SystemWakeOnLANEnabled is false"); - else if (!mDNSCoreHaveAdvertisedMulticastServices(m)) LogSPS("BeginSleepProcessing: No advertised services"); - else // If we have at least one advertised service - { - NetworkInterfaceInfo *intf; - for (intf = GetFirstActiveInterface(m->HostInterfaces); intf; intf = GetFirstActiveInterface(intf->next)) - { - if (!intf->NetWake) LogSPS("BeginSleepProcessing: %-6s not capable of magic packet wakeup", intf->ifname); -#if APPLE_OSX_mDNSResponder - else if (ActivateLocalProxy(m, intf->ifname) == mStatus_NoError) - { - SendGoodbyes = mDNSfalse; - LogSPS("BeginSleepProcessing: %-6s using local proxy", intf->ifname); - // This will leave m->SleepState set to SleepState_Transferring, - // which is okay because with no outstanding resolves, or updates in flight, - // mDNSCoreReadyForSleep() will conclude correctly that all the updates have already completed - } -#endif // APPLE_OSX_mDNSResponder - else - { - FindSPSInCache(m, &intf->NetWakeBrowse, sps); - if (!sps[0]) LogSPS("BeginSleepProcessing: %-6s %#a No Sleep Proxy Server found (Next Browse Q in %d, interval %d)", - intf->ifname, &intf->ip, NextQSendTime(&intf->NetWakeBrowse) - m->timenow, intf->NetWakeBrowse.ThisQInterval); - else - { - int i; - SendGoodbyes = mDNSfalse; - intf->NextSPSAttempt = 0; - intf->NextSPSAttemptTime = m->timenow + mDNSPlatformOneSecond; - // Don't need to set m->NextScheduledSPRetry here because we already set "m->NextScheduledSPRetry = m->timenow" above - for (i=0; i<3; i++) - { -#if ForceAlerts - if (intf->SPSAddr[i].type) - { LogMsg("BeginSleepProcessing: %s %d intf->SPSAddr[i].type %d", intf->ifname, i, intf->SPSAddr[i].type); *(long*)0 = 0; } - if (intf->NetWakeResolve[i].ThisQInterval >= 0) - { LogMsg("BeginSleepProcessing: %s %d intf->NetWakeResolve[i].ThisQInterval %d", intf->ifname, i, intf->NetWakeResolve[i].ThisQInterval); *(long*)0 = 0; } -#endif - intf->SPSAddr[i].type = mDNSAddrType_None; - if (intf->NetWakeResolve[i].ThisQInterval >= 0) mDNS_StopQuery(m, &intf->NetWakeResolve[i]); - intf->NetWakeResolve[i].ThisQInterval = -1; - if (sps[i]) - { - LogSPS("BeginSleepProcessing: %-6s Found Sleep Proxy Server %d TTL %d %s", intf->ifname, i, sps[i]->resrec.rroriginalttl, CRDisplayString(m, sps[i])); - mDNS_SetupQuestion(&intf->NetWakeResolve[i], intf->InterfaceID, &sps[i]->resrec.rdata->u.name, kDNSType_SRV, NetWakeResolve, intf); - intf->NetWakeResolve[i].ReturnIntermed = mDNStrue; - mDNS_StartQuery_internal(m, &intf->NetWakeResolve[i]); - } - } - } - } - } - } - - if (SendGoodbyes) // If we didn't find even one Sleep Proxy - { - LogSPS("BeginSleepProcessing: Not registering with Sleep Proxy Server"); - SendSleepGoodbyes(m); - } - } - -// Call mDNSCoreMachineSleep(m, mDNStrue) when the machine is about to go to sleep. -// Call mDNSCoreMachineSleep(m, mDNSfalse) when the machine is has just woken up. -// Normally, the platform support layer below mDNSCore should call this, not the client layer above. -mDNSexport void mDNSCoreMachineSleep(mDNS *const m, mDNSBool sleep) - { - AuthRecord *rr; - - LogSPS("%s (old state %d) at %ld", sleep ? "Sleeping" : "Waking", m->SleepState, m->timenow); - - if (sleep && !m->SleepState) // Going to sleep - { - mDNS_Lock(m); - // If we're going to sleep, need to stop advertising that we're a Sleep Proxy Server - if (m->SPSSocket) - { - mDNSu8 oldstate = m->SPSState; - mDNS_DropLockBeforeCallback(); // mDNS_DeregisterService expects to be called without the lock held, so we emulate that here - m->SPSState = 2; - if (oldstate == 1) mDNS_DeregisterService(m, &m->SPSRecords); - mDNS_ReclaimLockAfterCallback(); - } - - m->SleepState = SleepState_Transferring; - if (m->SystemWakeOnLANEnabled && m->DelaySleep) - { - // If we just woke up moments ago, allow ten seconds for networking to stabilize before going back to sleep - LogSPS("mDNSCoreMachineSleep: Re-sleeping immediately after waking; will delay for %d ticks", m->DelaySleep - m->timenow); - m->SleepLimit = NonZeroTime(m->DelaySleep + mDNSPlatformOneSecond * 10); - } - else - { - m->DelaySleep = 0; - m->SleepLimit = NonZeroTime(m->timenow + mDNSPlatformOneSecond * 10); - BeginSleepProcessing(m); - } - -#ifndef UNICAST_DISABLED - SuspendLLQs(m); -#endif - mDNS_Unlock(m); - // RemoveAutoTunnel6Record needs to be called outside the lock, as it grabs the lock also. -#if APPLE_OSX_mDNSResponder - RemoveAutoTunnel6Record(m); -#endif - LogSPS("mDNSCoreMachineSleep: m->SleepState %d (%s) seq %d", m->SleepState, - m->SleepState == SleepState_Transferring ? "Transferring" : - m->SleepState == SleepState_Sleeping ? "Sleeping" : "?", m->SleepSeqNum); - } - else if (!sleep) // Waking up - { - mDNSu32 slot; - CacheGroup *cg; - CacheRecord *cr; - NetworkInterfaceInfo *intf; - - mDNS_Lock(m); - // Reset SleepLimit back to 0 now that we're awake again. - m->SleepLimit = 0; - - // If we were previously sleeping, but now we're not, increment m->SleepSeqNum to indicate that we're entering a new period of wakefulness - if (m->SleepState != SleepState_Awake) - { - m->SleepState = SleepState_Awake; - m->SleepSeqNum++; - // If the machine wakes and then immediately tries to sleep again (e.g. a maintenance wake) - // then we enforce a minimum delay of 16 seconds before we begin sleep processing. - // This is to allow time for the Ethernet link to come up, DHCP to get an address, mDNS to issue queries, etc., - // before we make our determination of whether there's a Sleep Proxy out there we should register with. - m->DelaySleep = NonZeroTime(m->timenow + mDNSPlatformOneSecond * 16); - } - - if (m->SPSState == 3) - { - m->SPSState = 0; - mDNSCoreBeSleepProxyServer_internal(m, m->SPSType, m->SPSPortability, m->SPSMarginalPower, m->SPSTotalPower); - } - - // In case we gave up waiting and went to sleep before we got an ack from the Sleep Proxy, - // on wake we go through our record list and clear updateid back to zero - for (rr = m->ResourceRecords; rr; rr=rr->next) rr->updateid = zeroID; - - // ... and the same for NextSPSAttempt - for (intf = GetFirstActiveInterface(m->HostInterfaces); intf; intf = GetFirstActiveInterface(intf->next)) intf->NextSPSAttempt = -1; - - // Restart unicast and multicast queries - mDNSCoreRestartQueries(m); - - // and reactivtate service registrations - m->NextSRVUpdate = NonZeroTime(m->timenow + mDNSPlatformOneSecond); - LogInfo("mDNSCoreMachineSleep waking: NextSRVUpdate in %d %d", m->NextSRVUpdate - m->timenow, m->timenow); - - // 2. Re-validate our cache records - FORALL_CACHERECORDS(slot, cg, cr) - mDNS_Reconfirm_internal(m, cr, kDefaultReconfirmTimeForWake); - - // 3. Retrigger probing and announcing for all our authoritative records - for (rr = m->ResourceRecords; rr; rr=rr->next) - if (AuthRecord_uDNS(rr)) - { - ActivateUnicastRegistration(m, rr); - } - else - { - if (rr->resrec.RecordType == kDNSRecordTypeVerified && !rr->DependentOn) rr->resrec.RecordType = kDNSRecordTypeUnique; - rr->ProbeCount = DefaultProbeCountForRecordType(rr->resrec.RecordType); - rr->AnnounceCount = InitialAnnounceCount; - rr->SendNSECNow = mDNSNULL; - InitializeLastAPTime(m, rr); - } - - // 4. Refresh NAT mappings - // We don't want to have to assume that all hardware can necessarily keep accurate - // track of passage of time while asleep, so on wake we refresh our NAT mappings - // We typically wake up with no interfaces active, so there's no need to rush to try to find our external address. - // When we get a network configuration change, mDNSMacOSXNetworkChanged calls uDNS_SetupDNSConfig, which calls - // mDNS_SetPrimaryInterfaceInfo, which then sets m->retryGetAddr to immediately request our external address from the NAT gateway. - m->retryIntervalGetAddr = NATMAP_INIT_RETRY; - m->retryGetAddr = m->timenow + mDNSPlatformOneSecond * 5; - LogInfo("mDNSCoreMachineSleep: retryGetAddr in %d %d", m->retryGetAddr - m->timenow, m->timenow); - RecreateNATMappings(m); - mDNS_Unlock(m); - } - } - -mDNSexport mDNSBool mDNSCoreReadyForSleep(mDNS *m, mDNSs32 now) - { - DNSQuestion *q; - AuthRecord *rr; - NetworkInterfaceInfo *intf; - - mDNS_Lock(m); - - if (m->DelaySleep) goto notready; - - // If we've not hit the sleep limit time, and it's not time for our next retry, we can skip these checks - if (m->SleepLimit - now > 0 && m->NextScheduledSPRetry - now > 0) goto notready; - - m->NextScheduledSPRetry = now + 0x40000000UL; - - // See if we might need to retransmit any lost Sleep Proxy Registrations - for (intf = GetFirstActiveInterface(m->HostInterfaces); intf; intf = GetFirstActiveInterface(intf->next)) - if (intf->NextSPSAttempt >= 0) - { - if (now - intf->NextSPSAttemptTime >= 0) - { - LogSPS("mDNSCoreReadyForSleep: retrying for %s SPS %d try %d", - intf->ifname, intf->NextSPSAttempt/3, intf->NextSPSAttempt); - SendSPSRegistration(m, intf, zeroID); - // Don't need to "goto notready" here, because if we do still have record registrations - // that have not been acknowledged yet, we'll catch that in the record list scan below. - } - else - if (m->NextScheduledSPRetry - intf->NextSPSAttemptTime > 0) - m->NextScheduledSPRetry = intf->NextSPSAttemptTime; - } - - // Scan list of interfaces, and see if we're still waiting for any sleep proxy resolves to complete - for (intf = GetFirstActiveInterface(m->HostInterfaces); intf; intf = GetFirstActiveInterface(intf->next)) - { - int sps = (intf->NextSPSAttempt == 0) ? 0 : (intf->NextSPSAttempt-1)/3; - if (intf->NetWakeResolve[sps].ThisQInterval >= 0) - { - LogSPS("mDNSCoreReadyForSleep: waiting for SPS Resolve %s %##s (%s)", - intf->ifname, intf->NetWakeResolve[sps].qname.c, DNSTypeName(intf->NetWakeResolve[sps].qtype)); - goto spsnotready; - } - } - - // Scan list of registered records - for (rr = m->ResourceRecords; rr; rr = rr->next) - if (!AuthRecord_uDNS(rr)) - if (!mDNSOpaque16IsZero(rr->updateid)) - { LogSPS("mDNSCoreReadyForSleep: waiting for SPS Update ID %d %s", mDNSVal16(rr->updateid), ARDisplayString(m,rr)); goto spsnotready; } - - // Scan list of private LLQs, and make sure they've all completed their handshake with the server - for (q = m->Questions; q; q = q->next) - if (!mDNSOpaque16IsZero(q->TargetQID) && q->LongLived && q->ReqLease == 0 && q->tcp) - { - LogSPS("mDNSCoreReadyForSleep: waiting for LLQ %##s (%s)", q->qname.c, DNSTypeName(q->qtype)); - goto notready; - } - - // Scan list of registered records - for (rr = m->ResourceRecords; rr; rr = rr->next) - if (AuthRecord_uDNS(rr)) - { - if (rr->state == regState_Refresh && rr->tcp) - { LogSPS("mDNSCoreReadyForSleep: waiting for Record Update ID %d %s", mDNSVal16(rr->updateid), ARDisplayString(m,rr)); goto notready; } - #if APPLE_OSX_mDNSResponder - if (!RecordReadyForSleep(m, rr)) { LogSPS("mDNSCoreReadyForSleep: waiting for %s", ARDisplayString(m, rr)); goto notready; } - #endif - } - - mDNS_Unlock(m); - return mDNStrue; - -spsnotready: - - // If we failed to complete sleep proxy registration within ten seconds, we give up on that - // and allow up to ten seconds more to complete wide-area deregistration instead - if (now - m->SleepLimit >= 0) - { - LogMsg("Failed to register with SPS, now sending goodbyes"); - - for (intf = GetFirstActiveInterface(m->HostInterfaces); intf; intf = GetFirstActiveInterface(intf->next)) - if (intf->NetWakeBrowse.ThisQInterval >= 0) - { - LogSPS("ReadyForSleep mDNS_DeactivateNetWake %s %##s (%s)", - intf->ifname, intf->NetWakeResolve[0].qname.c, DNSTypeName(intf->NetWakeResolve[0].qtype)); - mDNS_DeactivateNetWake_internal(m, intf); - } - - for (rr = m->ResourceRecords; rr; rr = rr->next) - if (!AuthRecord_uDNS(rr)) - if (!mDNSOpaque16IsZero(rr->updateid)) - { - LogSPS("ReadyForSleep clearing updateid for %s", ARDisplayString(m, rr)); - rr->updateid = zeroID; - } - - // We'd really like to allow up to ten seconds more here, - // but if we don't respond to the sleep notification within 30 seconds - // we'll be put back to sleep forcibly without the chance to schedule the next maintenance wake. - // Right now we wait 16 sec after wake for all the interfaces to come up, then we wait up to 10 seconds - // more for SPS resolves and record registrations to complete, which puts us at 26 seconds. - // If we allow just one more second to send our goodbyes, that puts us at 27 seconds. - m->SleepLimit = now + mDNSPlatformOneSecond * 1; - - SendSleepGoodbyes(m); - } - -notready: - mDNS_Unlock(m); - return mDNSfalse; - } - -mDNSexport mDNSs32 mDNSCoreIntervalToNextWake(mDNS *const m, mDNSs32 now) - { - AuthRecord *ar; - - // Even when we have no wake-on-LAN-capable interfaces, or we failed to find a sleep proxy, or we have other - // failure scenarios, we still want to wake up in at most 120 minutes, to see if the network environment has changed. - // E.g. we might wake up and find no wireless network because the base station got rebooted just at that moment, - // and if that happens we don't want to just give up and go back to sleep and never try again. - mDNSs32 e = now + (120 * 60 * mDNSPlatformOneSecond); // Sleep for at most 120 minutes - - NATTraversalInfo *nat; - for (nat = m->NATTraversals; nat; nat=nat->next) - if (nat->Protocol && nat->ExpiryTime && nat->ExpiryTime - now > mDNSPlatformOneSecond*4) - { - mDNSs32 t = nat->ExpiryTime - (nat->ExpiryTime - now) / 10; // Wake up when 90% of the way to the expiry time - if (e - t > 0) e = t; - LogSPS("ComputeWakeTime: %p %s Int %5d Ext %5d Err %d Retry %5d Interval %5d Expire %5d Wake %5d", - nat, nat->Protocol == NATOp_MapTCP ? "TCP" : "UDP", - mDNSVal16(nat->IntPort), mDNSVal16(nat->ExternalPort), nat->Result, - nat->retryPortMap ? (nat->retryPortMap - now) / mDNSPlatformOneSecond : 0, - nat->retryInterval / mDNSPlatformOneSecond, - nat->ExpiryTime ? (nat->ExpiryTime - now) / mDNSPlatformOneSecond : 0, - (t - now) / mDNSPlatformOneSecond); - } - - // This loop checks both the time we need to renew wide-area registrations, - // and the time we need to renew Sleep Proxy registrations - for (ar = m->ResourceRecords; ar; ar = ar->next) - if (ar->expire && ar->expire - now > mDNSPlatformOneSecond*4) - { - mDNSs32 t = ar->expire - (ar->expire - now) / 10; // Wake up when 90% of the way to the expiry time - if (e - t > 0) e = t; - LogSPS("ComputeWakeTime: %p Int %7d Next %7d Expire %7d Wake %7d %s", - ar, ar->ThisAPInterval / mDNSPlatformOneSecond, - (ar->LastAPTime + ar->ThisAPInterval - now) / mDNSPlatformOneSecond, - ar->expire ? (ar->expire - now) / mDNSPlatformOneSecond : 0, - (t - now) / mDNSPlatformOneSecond, ARDisplayString(m, ar)); - } - - return(e - now); - } - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - Packet Reception Functions -#endif - -#define MustSendRecord(RR) ((RR)->NR_AnswerTo || (RR)->NR_AdditionalTo) - -mDNSlocal mDNSu8 *GenerateUnicastResponse(const DNSMessage *const query, const mDNSu8 *const end, - const mDNSInterfaceID InterfaceID, mDNSBool LegacyQuery, DNSMessage *const response, AuthRecord *ResponseRecords) - { - mDNSu8 *responseptr = response->data; - const mDNSu8 *const limit = response->data + sizeof(response->data); - const mDNSu8 *ptr = query->data; - AuthRecord *rr; - mDNSu32 maxttl = 0x70000000; - int i; - - // Initialize the response fields so we can answer the questions - InitializeDNSMessage(&response->h, query->h.id, ResponseFlags); - - // *** - // *** 1. Write out the list of questions we are actually going to answer with this packet - // *** - if (LegacyQuery) - { - maxttl = kStaticCacheTTL; - for (i=0; ih.numQuestions; i++) // For each question... - { - DNSQuestion q; - ptr = getQuestion(query, ptr, end, InterfaceID, &q); // get the question... - if (!ptr) return(mDNSNULL); - - for (rr=ResponseRecords; rr; rr=rr->NextResponse) // and search our list of proposed answers - { - if (rr->NR_AnswerTo == ptr) // If we're going to generate a record answering this question - { // then put the question in the question section - responseptr = putQuestion(response, responseptr, limit, &q.qname, q.qtype, q.qclass); - if (!responseptr) { debugf("GenerateUnicastResponse: Ran out of space for questions!"); return(mDNSNULL); } - break; // break out of the ResponseRecords loop, and go on to the next question - } - } - } - - if (response->h.numQuestions == 0) { LogMsg("GenerateUnicastResponse: ERROR! Why no questions?"); return(mDNSNULL); } - } - - // *** - // *** 2. Write Answers - // *** - for (rr=ResponseRecords; rr; rr=rr->NextResponse) - if (rr->NR_AnswerTo) - { - mDNSu8 *p = PutResourceRecordTTL(response, responseptr, &response->h.numAnswers, &rr->resrec, - maxttl < rr->resrec.rroriginalttl ? maxttl : rr->resrec.rroriginalttl); - if (p) responseptr = p; - else { debugf("GenerateUnicastResponse: Ran out of space for answers!"); response->h.flags.b[0] |= kDNSFlag0_TC; } - } - - // *** - // *** 3. Write Additionals - // *** - for (rr=ResponseRecords; rr; rr=rr->NextResponse) - if (rr->NR_AdditionalTo && !rr->NR_AnswerTo) - { - mDNSu8 *p = PutResourceRecordTTL(response, responseptr, &response->h.numAdditionals, &rr->resrec, - maxttl < rr->resrec.rroriginalttl ? maxttl : rr->resrec.rroriginalttl); - if (p) responseptr = p; - else debugf("GenerateUnicastResponse: No more space for additionals"); - } - - return(responseptr); - } - -// AuthRecord *our is our Resource Record -// CacheRecord *pkt is the Resource Record from the response packet we've witnessed on the network -// Returns 0 if there is no conflict -// Returns +1 if there was a conflict and we won -// Returns -1 if there was a conflict and we lost and have to rename -mDNSlocal int CompareRData(const AuthRecord *const our, const CacheRecord *const pkt) - { - mDNSu8 ourdata[256], *ourptr = ourdata, *ourend; - mDNSu8 pktdata[256], *pktptr = pktdata, *pktend; - if (!our) { LogMsg("CompareRData ERROR: our is NULL"); return(+1); } - if (!pkt) { LogMsg("CompareRData ERROR: pkt is NULL"); return(+1); } - - ourend = putRData(mDNSNULL, ourdata, ourdata + sizeof(ourdata), &our->resrec); - pktend = putRData(mDNSNULL, pktdata, pktdata + sizeof(pktdata), &pkt->resrec); - while (ourptr < ourend && pktptr < pktend && *ourptr == *pktptr) { ourptr++; pktptr++; } - if (ourptr >= ourend && pktptr >= pktend) return(0); // If data identical, not a conflict - - if (ourptr >= ourend) return(-1); // Our data ran out first; We lost - if (pktptr >= pktend) return(+1); // Packet data ran out first; We won - if (*pktptr > *ourptr) return(-1); // Our data is numerically lower; We lost - if (*pktptr < *ourptr) return(+1); // Packet data is numerically lower; We won - - LogMsg("CompareRData ERROR: Invalid state"); - return(-1); - } - -// See if we have an authoritative record that's identical to this packet record, -// whose canonical DependentOn record is the specified master record. -// The DependentOn pointer is typically used for the TXT record of service registrations -// It indicates that there is no inherent conflict detection for the TXT record -// -- it depends on the SRV record to resolve name conflicts -// If we find any identical ResourceRecords in our authoritative list, then follow their DependentOn -// pointer chain (if any) to make sure we reach the canonical DependentOn record -// If the record has no DependentOn, then just return that record's pointer -// Returns NULL if we don't have any local RRs that are identical to the one from the packet -mDNSlocal mDNSBool MatchDependentOn(const mDNS *const m, const CacheRecord *const pktrr, const AuthRecord *const master) - { - const AuthRecord *r1; - for (r1 = m->ResourceRecords; r1; r1=r1->next) - { - if (IdenticalResourceRecord(&r1->resrec, &pktrr->resrec)) - { - const AuthRecord *r2 = r1; - while (r2->DependentOn) r2 = r2->DependentOn; - if (r2 == master) return(mDNStrue); - } - } - for (r1 = m->DuplicateRecords; r1; r1=r1->next) - { - if (IdenticalResourceRecord(&r1->resrec, &pktrr->resrec)) - { - const AuthRecord *r2 = r1; - while (r2->DependentOn) r2 = r2->DependentOn; - if (r2 == master) return(mDNStrue); - } - } - return(mDNSfalse); - } - -// Find the canonical RRSet pointer for this RR received in a packet. -// If we find any identical AuthRecord in our authoritative list, then follow its RRSet -// pointers (if any) to make sure we return the canonical member of this name/type/class -// Returns NULL if we don't have any local RRs that are identical to the one from the packet -mDNSlocal const AuthRecord *FindRRSet(const mDNS *const m, const CacheRecord *const pktrr) - { - const AuthRecord *rr; - for (rr = m->ResourceRecords; rr; rr=rr->next) - { - if (IdenticalResourceRecord(&rr->resrec, &pktrr->resrec)) - { - while (rr->RRSet && rr != rr->RRSet) rr = rr->RRSet; - return(rr); - } - } - return(mDNSNULL); - } - -// PacketRRConflict is called when we've received an RR (pktrr) which has the same name -// as one of our records (our) but different rdata. -// 1. If our record is not a type that's supposed to be unique, we don't care. -// 2a. If our record is marked as dependent on some other record for conflict detection, ignore this one. -// 2b. If the packet rr exactly matches one of our other RRs, and *that* record's DependentOn pointer -// points to our record, ignore this conflict (e.g. the packet record matches one of our -// TXT records, and that record is marked as dependent on 'our', its SRV record). -// 3. If we have some *other* RR that exactly matches the one from the packet, and that record and our record -// are members of the same RRSet, then this is not a conflict. -mDNSlocal mDNSBool PacketRRConflict(const mDNS *const m, const AuthRecord *const our, const CacheRecord *const pktrr) - { - // If not supposed to be unique, not a conflict - if (!(our->resrec.RecordType & kDNSRecordTypeUniqueMask)) return(mDNSfalse); - - // If a dependent record, not a conflict - if (our->DependentOn || MatchDependentOn(m, pktrr, our)) return(mDNSfalse); - else - { - // If the pktrr matches a member of ourset, not a conflict - const AuthRecord *ourset = our->RRSet ? our->RRSet : our; - const AuthRecord *pktset = FindRRSet(m, pktrr); - if (pktset == ourset) return(mDNSfalse); - - // For records we're proxying, where we don't know the full - // relationship between the records, having any matching record - // in our AuthRecords list is sufficient evidence of non-conflict - if (our->WakeUp.HMAC.l[0] && pktset) return(mDNSfalse); - } - - // Okay, this is a conflict - return(mDNStrue); - } - -// Note: ResolveSimultaneousProbe calls mDNS_Deregister_internal which can call a user callback, which may change -// the record list and/or question list. -// Any code walking either list must use the CurrentQuestion and/or CurrentRecord mechanism to protect against this. -mDNSlocal void ResolveSimultaneousProbe(mDNS *const m, const DNSMessage *const query, const mDNSu8 *const end, - DNSQuestion *q, AuthRecord *our) - { - int i; - const mDNSu8 *ptr = LocateAuthorities(query, end); - mDNSBool FoundUpdate = mDNSfalse; - - for (i = 0; i < query->h.numAuthorities; i++) - { - ptr = GetLargeResourceRecord(m, query, ptr, end, q->InterfaceID, kDNSRecordTypePacketAuth, &m->rec); - if (!ptr) break; - if (m->rec.r.resrec.RecordType != kDNSRecordTypePacketNegative && ResourceRecordAnswersQuestion(&m->rec.r.resrec, q)) - { - FoundUpdate = mDNStrue; - if (PacketRRConflict(m, our, &m->rec.r)) - { - int result = (int)our->resrec.rrclass - (int)m->rec.r.resrec.rrclass; - if (!result) result = (int)our->resrec.rrtype - (int)m->rec.r.resrec.rrtype; - if (!result) result = CompareRData(our, &m->rec.r); - if (result) - { - const char *const msg = (result < 0) ? "lost:" : (result > 0) ? "won: " : "tie: "; - LogMsg("ResolveSimultaneousProbe: %p Pkt Record: %08lX %s", q->InterfaceID, m->rec.r.resrec.rdatahash, CRDisplayString(m, &m->rec.r)); - LogMsg("ResolveSimultaneousProbe: %p Our Record %d %s %08lX %s", our->resrec.InterfaceID, our->ProbeCount, msg, our->resrec.rdatahash, ARDisplayString(m, our)); - } - // If we lost the tie-break for simultaneous probes, we don't immediately give up, because we might be seeing stale packets on the network. - // Instead we pause for one second, to give the other host (if real) a chance to establish its name, and then try probing again. - // If there really is another live host out there with the same name, it will answer our probes and we'll then rename. - if (result < 0) - { - m->SuppressProbes = NonZeroTime(m->timenow + mDNSPlatformOneSecond); - our->ProbeCount = DefaultProbeCountForTypeUnique; - our->AnnounceCount = InitialAnnounceCount; - InitializeLastAPTime(m, our); - goto exit; - } - } -#if 0 - else - { - LogMsg("ResolveSimultaneousProbe: %p Pkt Record: %08lX %s", q->InterfaceID, m->rec.r.resrec.rdatahash, CRDisplayString(m, &m->rec.r)); - LogMsg("ResolveSimultaneousProbe: %p Our Record %d ign: %08lX %s", our->resrec.InterfaceID, our->ProbeCount, our->resrec.rdatahash, ARDisplayString(m, our)); - } -#endif - } - m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it - } - if (!FoundUpdate) - LogInfo("ResolveSimultaneousProbe: %##s (%s): No Update Record found", our->resrec.name->c, DNSTypeName(our->resrec.rrtype)); -exit: - m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it - } - -mDNSlocal CacheRecord *FindIdenticalRecordInCache(const mDNS *const m, const ResourceRecord *const pktrr) - { - mDNSu32 slot = HashSlot(pktrr->name); - CacheGroup *cg = CacheGroupForRecord(m, slot, pktrr); - CacheRecord *rr; - mDNSBool match; - for (rr = cg ? cg->members : mDNSNULL; rr; rr=rr->next) - { - match = !pktrr->InterfaceID ? pktrr->rDNSServer == rr->resrec.rDNSServer : pktrr->InterfaceID == rr->resrec.InterfaceID; - if (match && IdenticalSameNameRecord(pktrr, &rr->resrec)) break; - } - return(rr); - } - -// Called from mDNSCoreReceiveUpdate when we get a sleep proxy registration request, -// to check our lists and discard any stale duplicates of this record we already have -mDNSlocal void ClearIdenticalProxyRecords(mDNS *const m, const OwnerOptData *const owner, AuthRecord *const thelist) - { - if (m->CurrentRecord) - LogMsg("ClearIdenticalProxyRecords ERROR m->CurrentRecord already set %s", ARDisplayString(m, m->CurrentRecord)); - m->CurrentRecord = thelist; - while (m->CurrentRecord) - { - AuthRecord *const rr = m->CurrentRecord; - if (m->rec.r.resrec.InterfaceID == rr->resrec.InterfaceID && mDNSSameEthAddress(&owner->HMAC, &rr->WakeUp.HMAC)) - if (IdenticalResourceRecord(&rr->resrec, &m->rec.r.resrec)) - { - LogSPS("ClearIdenticalProxyRecords: Removing %3d H-MAC %.6a I-MAC %.6a %d %d %s", - m->ProxyRecords, &rr->WakeUp.HMAC, &rr->WakeUp.IMAC, rr->WakeUp.seq, owner->seq, ARDisplayString(m, rr)); - rr->WakeUp.HMAC = zeroEthAddr; // Clear HMAC so that mDNS_Deregister_internal doesn't waste packets trying to wake this host - rr->RequireGoodbye = mDNSfalse; // and we don't want to send goodbye for it - mDNS_Deregister_internal(m, rr, mDNS_Dereg_normal); - SetSPSProxyListChanged(m->rec.r.resrec.InterfaceID); - } - // Mustn't advance m->CurrentRecord until *after* mDNS_Deregister_internal, because - // new records could have been added to the end of the list as a result of that call. - if (m->CurrentRecord == rr) // If m->CurrentRecord was not advanced for us, do it now - m->CurrentRecord = rr->next; - } - } - -// Called from ProcessQuery when we get an mDNS packet with an owner record in it -mDNSlocal void ClearProxyRecords(mDNS *const m, const OwnerOptData *const owner, AuthRecord *const thelist) - { - if (m->CurrentRecord) - LogMsg("ClearProxyRecords ERROR m->CurrentRecord already set %s", ARDisplayString(m, m->CurrentRecord)); - m->CurrentRecord = thelist; - while (m->CurrentRecord) - { - AuthRecord *const rr = m->CurrentRecord; - if (m->rec.r.resrec.InterfaceID == rr->resrec.InterfaceID && mDNSSameEthAddress(&owner->HMAC, &rr->WakeUp.HMAC)) - if (owner->seq != rr->WakeUp.seq || m->timenow - rr->TimeRcvd > mDNSPlatformOneSecond * 60) - { - if (rr->AddressProxy.type == mDNSAddrType_IPv6) - { - // We don't do this here because we know that the host is waking up at this point, so we don't send - // Unsolicited Neighbor Advertisements -- even Neighbor Advertisements agreeing with what the host should be - // saying itself -- because it can cause some IPv6 stacks to falsely conclude that there's an address conflict. - #if MDNS_USE_Unsolicited_Neighbor_Advertisements - LogSPS("NDP Announcement -- Releasing traffic for H-MAC %.6a I-MAC %.6a %s", - &rr->WakeUp.HMAC, &rr->WakeUp.IMAC, ARDisplayString(m,rr)); - SendNDP(m, NDP_Adv, NDP_Override, rr, &rr->AddressProxy.ip.v6, &rr->WakeUp.IMAC, &AllHosts_v6, &AllHosts_v6_Eth); - #endif - } - LogSPS("ClearProxyRecords: Removing %3d AC %2d %02X H-MAC %.6a I-MAC %.6a %d %d %s", - m->ProxyRecords, rr->AnnounceCount, rr->resrec.RecordType, - &rr->WakeUp.HMAC, &rr->WakeUp.IMAC, rr->WakeUp.seq, owner->seq, ARDisplayString(m, rr)); - if (rr->resrec.RecordType == kDNSRecordTypeDeregistering) rr->resrec.RecordType = kDNSRecordTypeShared; - rr->WakeUp.HMAC = zeroEthAddr; // Clear HMAC so that mDNS_Deregister_internal doesn't waste packets trying to wake this host - rr->RequireGoodbye = mDNSfalse; // and we don't want to send goodbye for it, since real host is now back and functional - mDNS_Deregister_internal(m, rr, mDNS_Dereg_normal); - SetSPSProxyListChanged(m->rec.r.resrec.InterfaceID); - } - // Mustn't advance m->CurrentRecord until *after* mDNS_Deregister_internal, because - // new records could have been added to the end of the list as a result of that call. - if (m->CurrentRecord == rr) // If m->CurrentRecord was not advanced for us, do it now - m->CurrentRecord = rr->next; - } - } - -// ProcessQuery examines a received query to see if we have any answers to give -mDNSlocal mDNSu8 *ProcessQuery(mDNS *const m, const DNSMessage *const query, const mDNSu8 *const end, - const mDNSAddr *srcaddr, const mDNSInterfaceID InterfaceID, mDNSBool LegacyQuery, mDNSBool QueryWasMulticast, - mDNSBool QueryWasLocalUnicast, DNSMessage *const response) - { - mDNSBool FromLocalSubnet = srcaddr && mDNS_AddressIsLocalSubnet(m, InterfaceID, srcaddr); - AuthRecord *ResponseRecords = mDNSNULL; - AuthRecord **nrp = &ResponseRecords; - CacheRecord *ExpectedAnswers = mDNSNULL; // Records in our cache we expect to see updated - CacheRecord **eap = &ExpectedAnswers; - DNSQuestion *DupQuestions = mDNSNULL; // Our questions that are identical to questions in this packet - DNSQuestion **dqp = &DupQuestions; - mDNSs32 delayresponse = 0; - mDNSBool SendLegacyResponse = mDNSfalse; - const mDNSu8 *ptr; - mDNSu8 *responseptr = mDNSNULL; - AuthRecord *rr; - int i; - - // *** - // *** 1. Look in Additional Section for an OPT record - // *** - ptr = LocateOptRR(query, end, DNSOpt_OwnerData_ID_Space); - if (ptr) - { - ptr = GetLargeResourceRecord(m, query, ptr, end, InterfaceID, kDNSRecordTypePacketAdd, &m->rec); - if (ptr && m->rec.r.resrec.RecordType != kDNSRecordTypePacketNegative && m->rec.r.resrec.rrtype == kDNSType_OPT) - { - const rdataOPT *opt; - const rdataOPT *const e = (const rdataOPT *)&m->rec.r.resrec.rdata->u.data[m->rec.r.resrec.rdlength]; - // Find owner sub-option(s). We verify that the MAC is non-zero, otherwise we could inadvertently - // delete all our own AuthRecords (which are identified by having zero MAC tags on them). - for (opt = &m->rec.r.resrec.rdata->u.opt[0]; opt < e; opt++) - if (opt->opt == kDNSOpt_Owner && opt->u.owner.vers == 0 && opt->u.owner.HMAC.l[0]) - { - ClearProxyRecords(m, &opt->u.owner, m->DuplicateRecords); - ClearProxyRecords(m, &opt->u.owner, m->ResourceRecords); - } - } - m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it - } - - // *** - // *** 2. Parse Question Section and mark potential answers - // *** - ptr = query->data; - for (i=0; ih.numQuestions; i++) // For each question... - { - mDNSBool QuestionNeedsMulticastResponse; - int NumAnswersForThisQuestion = 0; - AuthRecord *NSECAnswer = mDNSNULL; - DNSQuestion pktq, *q; - ptr = getQuestion(query, ptr, end, InterfaceID, &pktq); // get the question... - if (!ptr) goto exit; - - // The only queries that *need* a multicast response are: - // * Queries sent via multicast - // * from port 5353 - // * that don't have the kDNSQClass_UnicastResponse bit set - // These queries need multicast responses because other clients will: - // * suppress their own identical questions when they see these questions, and - // * expire their cache records if they don't see the expected responses - // For other queries, we may still choose to send the occasional multicast response anyway, - // to keep our neighbours caches warm, and for ongoing conflict detection. - QuestionNeedsMulticastResponse = QueryWasMulticast && !LegacyQuery && !(pktq.qclass & kDNSQClass_UnicastResponse); - // Clear the UnicastResponse flag -- don't want to confuse the rest of the code that follows later - pktq.qclass &= ~kDNSQClass_UnicastResponse; - - // Note: We use the m->CurrentRecord mechanism here because calling ResolveSimultaneousProbe - // can result in user callbacks which may change the record list and/or question list. - // Also note: we just mark potential answer records here, without trying to build the - // "ResponseRecords" list, because we don't want to risk user callbacks deleting records - // from that list while we're in the middle of trying to build it. - if (m->CurrentRecord) - LogMsg("ProcessQuery ERROR m->CurrentRecord already set %s", ARDisplayString(m, m->CurrentRecord)); - m->CurrentRecord = m->ResourceRecords; - while (m->CurrentRecord) - { - rr = m->CurrentRecord; - m->CurrentRecord = rr->next; - if (AnyTypeRecordAnswersQuestion(&rr->resrec, &pktq) && (QueryWasMulticast || QueryWasLocalUnicast || rr->AllowRemoteQuery)) - { - if (RRTypeAnswersQuestionType(&rr->resrec, pktq.qtype)) - { - if (rr->resrec.RecordType == kDNSRecordTypeUnique) - ResolveSimultaneousProbe(m, query, end, &pktq, rr); - else if (ResourceRecordIsValidAnswer(rr)) - { - NumAnswersForThisQuestion++; - // Note: We should check here if this is a probe-type query, and if so, generate an immediate - // unicast answer back to the source, because timeliness in answering probes is important. - - // Notes: - // NR_AnswerTo pointing into query packet means "answer via immediate legacy unicast" (may *also* choose to multicast) - // NR_AnswerTo == (mDNSu8*)~1 means "answer via delayed unicast" (to modern querier; may promote to multicast instead) - // NR_AnswerTo == (mDNSu8*)~0 means "definitely answer via multicast" (can't downgrade to unicast later) - // If we're not multicasting this record because the kDNSQClass_UnicastResponse bit was set, - // but the multicast querier is not on a matching subnet (e.g. because of overlaid subnets on one link) - // then we'll multicast it anyway (if we unicast, the receiver will ignore it because it has an apparently non-local source) - if (QuestionNeedsMulticastResponse || (!FromLocalSubnet && QueryWasMulticast && !LegacyQuery)) - { - // We only mark this question for sending if it is at least one second since the last time we multicast it - // on this interface. If it is more than a second, or LastMCInterface is different, then we may multicast it. - // This is to guard against the case where someone blasts us with queries as fast as they can. - if (m->timenow - (rr->LastMCTime + mDNSPlatformOneSecond) >= 0 || - (rr->LastMCInterface != mDNSInterfaceMark && rr->LastMCInterface != InterfaceID)) - rr->NR_AnswerTo = (mDNSu8*)~0; - } - else if (!rr->NR_AnswerTo) rr->NR_AnswerTo = LegacyQuery ? ptr : (mDNSu8*)~1; - } - } - else if ((rr->resrec.RecordType & kDNSRecordTypeActiveUniqueMask) && ResourceRecordIsValidAnswer(rr)) - { - // If we don't have any answers for this question, but we do own another record with the same name, - // then we'll want to mark it to generate an NSEC record on this interface - if (!NSECAnswer) NSECAnswer = rr; - } - } - } - - if (NumAnswersForThisQuestion == 0 && NSECAnswer) - { - NumAnswersForThisQuestion++; - NSECAnswer->SendNSECNow = InterfaceID; - m->NextScheduledResponse = m->timenow; - } - - // If we couldn't answer this question, someone else might be able to, - // so use random delay on response to reduce collisions - if (NumAnswersForThisQuestion == 0) delayresponse = mDNSPlatformOneSecond; // Divided by 50 = 20ms - -#if ENABLE_MULTI_PACKET_QUERY_SNOOPING - if (QuestionNeedsMulticastResponse) -#else - // We only do the following accelerated cache expiration and duplicate question suppression processing - // for non-truncated multicast queries with multicast responses. - // For any query generating a unicast response we don't do this because we can't assume we will see the response. - // For truncated queries we don't do this because a response we're expecting might be suppressed by a subsequent - // known-answer packet, and when there's packet loss we can't safely assume we'll receive *all* known-answer packets. - if (QuestionNeedsMulticastResponse && !(query->h.flags.b[0] & kDNSFlag0_TC)) -#endif - { - const mDNSu32 slot = HashSlot(&pktq.qname); - CacheGroup *cg = CacheGroupForName(m, slot, pktq.qnamehash, &pktq.qname); - CacheRecord *cr; - - // Make a list indicating which of our own cache records we expect to see updated as a result of this query - // Note: Records larger than 1K are not habitually multicast, so don't expect those to be updated -#if ENABLE_MULTI_PACKET_QUERY_SNOOPING - if (!(query->h.flags.b[0] & kDNSFlag0_TC)) -#endif - for (cr = cg ? cg->members : mDNSNULL; cr; cr=cr->next) - if (SameNameRecordAnswersQuestion(&cr->resrec, &pktq) && cr->resrec.rdlength <= SmallRecordLimit) - if (!cr->NextInKAList && eap != &cr->NextInKAList) - { - *eap = cr; - eap = &cr->NextInKAList; -#if ENABLE_MULTI_PACKET_QUERY_SNOOPING - if (cr->MPUnansweredQ == 0 || m->timenow - cr->MPLastUnansweredQT >= mDNSPlatformOneSecond) - { - // Although MPUnansweredQ is only really used for multi-packet query processing, - // we increment it for both single-packet and multi-packet queries, so that it stays in sync - // with the MPUnansweredKA value, which by necessity is incremented for both query types. - cr->MPUnansweredQ++; - cr->MPLastUnansweredQT = m->timenow; - cr->MPExpectingKA = mDNStrue; - } -#endif - } - - // Check if this question is the same as any of mine. - // We only do this for non-truncated queries. Right now it would be too complicated to try - // to keep track of duplicate suppression state between multiple packets, especially when we - // can't guarantee to receive all of the Known Answer packets that go with a particular query. -#if ENABLE_MULTI_PACKET_QUERY_SNOOPING - if (!(query->h.flags.b[0] & kDNSFlag0_TC)) -#endif - for (q = m->Questions; q; q=q->next) - if (!q->Target.type && ActiveQuestion(q) && m->timenow - q->LastQTxTime > mDNSPlatformOneSecond / 4) - if (!q->InterfaceID || q->InterfaceID == InterfaceID) - if (q->NextInDQList == mDNSNULL && dqp != &q->NextInDQList) - if (q->qtype == pktq.qtype && - q->qclass == pktq.qclass && - q->qnamehash == pktq.qnamehash && SameDomainName(&q->qname, &pktq.qname)) - { *dqp = q; dqp = &q->NextInDQList; } - } - } - - // *** - // *** 3. Now we can safely build the list of marked answers - // *** - for (rr = m->ResourceRecords; rr; rr=rr->next) // Now build our list of potential answers - if (rr->NR_AnswerTo) // If we marked the record... - AddRecordToResponseList(&nrp, rr, mDNSNULL); // ... add it to the list - - // *** - // *** 4. Add additional records - // *** - AddAdditionalsToResponseList(m, ResponseRecords, &nrp, InterfaceID); - - // *** - // *** 5. Parse Answer Section and cancel any records disallowed by Known-Answer list - // *** - for (i=0; ih.numAnswers; i++) // For each record in the query's answer section... - { - // Get the record... - CacheRecord *ourcacherr; - ptr = GetLargeResourceRecord(m, query, ptr, end, InterfaceID, kDNSRecordTypePacketAns, &m->rec); - if (!ptr) goto exit; - if (m->rec.r.resrec.RecordType != kDNSRecordTypePacketNegative) - { - // See if this Known-Answer suppresses any of our currently planned answers - for (rr=ResponseRecords; rr; rr=rr->NextResponse) - if (MustSendRecord(rr) && ShouldSuppressKnownAnswer(&m->rec.r, rr)) - { rr->NR_AnswerTo = mDNSNULL; rr->NR_AdditionalTo = mDNSNULL; } - - // See if this Known-Answer suppresses any previously scheduled answers (for multi-packet KA suppression) - for (rr=m->ResourceRecords; rr; rr=rr->next) - { - // If we're planning to send this answer on this interface, and only on this interface, then allow KA suppression - if (rr->ImmedAnswer == InterfaceID && ShouldSuppressKnownAnswer(&m->rec.r, rr)) - { - if (srcaddr->type == mDNSAddrType_IPv4) - { - if (mDNSSameIPv4Address(rr->v4Requester, srcaddr->ip.v4)) rr->v4Requester = zerov4Addr; - } - else if (srcaddr->type == mDNSAddrType_IPv6) - { - if (mDNSSameIPv6Address(rr->v6Requester, srcaddr->ip.v6)) rr->v6Requester = zerov6Addr; - } - if (mDNSIPv4AddressIsZero(rr->v4Requester) && mDNSIPv6AddressIsZero(rr->v6Requester)) - { - rr->ImmedAnswer = mDNSNULL; - rr->ImmedUnicast = mDNSfalse; - #if MDNS_LOG_ANSWER_SUPPRESSION_TIMES - LogMsg("Suppressed after%4d: %s", m->timenow - rr->ImmedAnswerMarkTime, ARDisplayString(m, rr)); - #endif - } - } - } - - ourcacherr = FindIdenticalRecordInCache(m, &m->rec.r.resrec); - - #if ENABLE_MULTI_PACKET_QUERY_SNOOPING - // See if this Known-Answer suppresses any answers we were expecting for our cache records. We do this always, - // even if the TC bit is not set (the TC bit will *not* be set in the *last* packet of a multi-packet KA list). - if (ourcacherr && ourcacherr->MPExpectingKA && m->timenow - ourcacherr->MPLastUnansweredQT < mDNSPlatformOneSecond) - { - ourcacherr->MPUnansweredKA++; - ourcacherr->MPExpectingKA = mDNSfalse; - } - #endif - - // Having built our ExpectedAnswers list from the questions in this packet, we then remove - // any records that are suppressed by the Known Answer list in this packet. - eap = &ExpectedAnswers; - while (*eap) - { - CacheRecord *cr = *eap; - if (cr->resrec.InterfaceID == InterfaceID && IdenticalResourceRecord(&m->rec.r.resrec, &cr->resrec)) - { *eap = cr->NextInKAList; cr->NextInKAList = mDNSNULL; } - else eap = &cr->NextInKAList; - } - - // See if this Known-Answer is a surprise to us. If so, we shouldn't suppress our own query. - if (!ourcacherr) - { - dqp = &DupQuestions; - while (*dqp) - { - DNSQuestion *q = *dqp; - if (ResourceRecordAnswersQuestion(&m->rec.r.resrec, q)) - { *dqp = q->NextInDQList; q->NextInDQList = mDNSNULL; } - else dqp = &q->NextInDQList; - } - } - } - m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it - } - - // *** - // *** 6. Cancel any additionals that were added because of now-deleted records - // *** - for (rr=ResponseRecords; rr; rr=rr->NextResponse) - if (rr->NR_AdditionalTo && !MustSendRecord(rr->NR_AdditionalTo)) - { rr->NR_AnswerTo = mDNSNULL; rr->NR_AdditionalTo = mDNSNULL; } - - // *** - // *** 7. Mark the send flags on the records we plan to send - // *** - for (rr=ResponseRecords; rr; rr=rr->NextResponse) - { - if (rr->NR_AnswerTo) - { - mDNSBool SendMulticastResponse = mDNSfalse; // Send modern multicast response - mDNSBool SendUnicastResponse = mDNSfalse; // Send modern unicast response (not legacy unicast response) - - // If it's been a while since we multicast this, then send a multicast response for conflict detection, etc. - if (m->timenow - (rr->LastMCTime + TicksTTL(rr)/4) >= 0) - { - SendMulticastResponse = mDNStrue; - // If this record was marked for modern (delayed) unicast response, then mark it as promoted to - // multicast response instead (don't want to end up ALSO setting SendUnicastResponse in the check below). - // If this record was marked for legacy unicast response, then we mustn't change the NR_AnswerTo value. - if (rr->NR_AnswerTo == (mDNSu8*)~1) rr->NR_AnswerTo = (mDNSu8*)~0; - } - - // If the client insists on a multicast response, then we'd better send one - if (rr->NR_AnswerTo == (mDNSu8*)~0) SendMulticastResponse = mDNStrue; - else if (rr->NR_AnswerTo == (mDNSu8*)~1) SendUnicastResponse = mDNStrue; - else if (rr->NR_AnswerTo) SendLegacyResponse = mDNStrue; - - if (SendMulticastResponse || SendUnicastResponse) - { -#if MDNS_LOG_ANSWER_SUPPRESSION_TIMES - rr->ImmedAnswerMarkTime = m->timenow; -#endif - m->NextScheduledResponse = m->timenow; - // If we're already planning to send this on another interface, just send it on all interfaces - if (rr->ImmedAnswer && rr->ImmedAnswer != InterfaceID) - rr->ImmedAnswer = mDNSInterfaceMark; - else - { - rr->ImmedAnswer = InterfaceID; // Record interface to send it on - if (SendUnicastResponse) rr->ImmedUnicast = mDNStrue; - if (srcaddr->type == mDNSAddrType_IPv4) - { - if (mDNSIPv4AddressIsZero(rr->v4Requester)) rr->v4Requester = srcaddr->ip.v4; - else if (!mDNSSameIPv4Address(rr->v4Requester, srcaddr->ip.v4)) rr->v4Requester = onesIPv4Addr; - } - else if (srcaddr->type == mDNSAddrType_IPv6) - { - if (mDNSIPv6AddressIsZero(rr->v6Requester)) rr->v6Requester = srcaddr->ip.v6; - else if (!mDNSSameIPv6Address(rr->v6Requester, srcaddr->ip.v6)) rr->v6Requester = onesIPv6Addr; - } - } - } - // If TC flag is set, it means we should expect that additional known answers may be coming in another packet, - // so we allow roughly half a second before deciding to reply (we've observed inter-packet delays of 100-200ms on 802.11) - // else, if record is a shared one, spread responses over 100ms to avoid implosion of simultaneous responses - // else, for a simple unique record reply, we can reply immediately; no need for delay - if (query->h.flags.b[0] & kDNSFlag0_TC) delayresponse = mDNSPlatformOneSecond * 20; // Divided by 50 = 400ms - else if (rr->resrec.RecordType == kDNSRecordTypeShared) delayresponse = mDNSPlatformOneSecond; // Divided by 50 = 20ms - } - else if (rr->NR_AdditionalTo && rr->NR_AdditionalTo->NR_AnswerTo == (mDNSu8*)~0) - { - // Since additional records are an optimization anyway, we only ever send them on one interface at a time - // If two clients on different interfaces do queries that invoke the same optional additional answer, - // then the earlier client is out of luck - rr->ImmedAdditional = InterfaceID; - // No need to set m->NextScheduledResponse here - // We'll send these additional records when we send them, or not, as the case may be - } - } - - // *** - // *** 8. If we think other machines are likely to answer these questions, set our packet suppression timer - // *** - if (delayresponse && (!m->SuppressSending || (m->SuppressSending - m->timenow) < (delayresponse + 49) / 50)) - { -#if MDNS_LOG_ANSWER_SUPPRESSION_TIMES - mDNSs32 oldss = m->SuppressSending; - if (oldss && delayresponse) - LogMsg("Current SuppressSending delay%5ld; require%5ld", m->SuppressSending - m->timenow, (delayresponse + 49) / 50); -#endif - // Pick a random delay: - // We start with the base delay chosen above (typically either 1 second or 20 seconds), - // and add a random value in the range 0-5 seconds (making 1-6 seconds or 20-25 seconds). - // This is an integer value, with resolution determined by the platform clock rate. - // We then divide that by 50 to get the delay value in ticks. We defer the division until last - // to get better results on platforms with coarse clock granularity (e.g. ten ticks per second). - // The +49 before dividing is to ensure we round up, not down, to ensure that even - // on platforms where the native clock rate is less than fifty ticks per second, - // we still guarantee that the final calculated delay is at least one platform tick. - // We want to make sure we don't ever allow the delay to be zero ticks, - // because if that happens we'll fail the Bonjour Conformance Test. - // Our final computed delay is 20-120ms for normal delayed replies, - // or 400-500ms in the case of multi-packet known-answer lists. - m->SuppressSending = m->timenow + (delayresponse + (mDNSs32)mDNSRandom((mDNSu32)mDNSPlatformOneSecond*5) + 49) / 50; - if (m->SuppressSending == 0) m->SuppressSending = 1; -#if MDNS_LOG_ANSWER_SUPPRESSION_TIMES - if (oldss && delayresponse) - LogMsg("Set SuppressSending to %5ld", m->SuppressSending - m->timenow); -#endif - } - - // *** - // *** 9. If query is from a legacy client, or from a new client requesting a unicast reply, then generate a unicast response too - // *** - if (SendLegacyResponse) - responseptr = GenerateUnicastResponse(query, end, InterfaceID, LegacyQuery, response, ResponseRecords); - -exit: - m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it - - // *** - // *** 10. Finally, clear our link chains ready for use next time - // *** - while (ResponseRecords) - { - rr = ResponseRecords; - ResponseRecords = rr->NextResponse; - rr->NextResponse = mDNSNULL; - rr->NR_AnswerTo = mDNSNULL; - rr->NR_AdditionalTo = mDNSNULL; - } - - while (ExpectedAnswers) - { - CacheRecord *cr = ExpectedAnswers; - ExpectedAnswers = cr->NextInKAList; - cr->NextInKAList = mDNSNULL; - - // For non-truncated queries, we can definitively say that we should expect - // to be seeing a response for any records still left in the ExpectedAnswers list - if (!(query->h.flags.b[0] & kDNSFlag0_TC)) - if (cr->UnansweredQueries == 0 || m->timenow - cr->LastUnansweredTime >= mDNSPlatformOneSecond) - { - cr->UnansweredQueries++; - cr->LastUnansweredTime = m->timenow; -#if ENABLE_MULTI_PACKET_QUERY_SNOOPING - if (cr->UnansweredQueries > 1) - debugf("ProcessQuery: (!TC) UAQ %lu MPQ %lu MPKA %lu %s", - cr->UnansweredQueries, cr->MPUnansweredQ, cr->MPUnansweredKA, CRDisplayString(m, cr)); -#endif - SetNextCacheCheckTimeForRecord(m, cr); - } - - // If we've seen multiple unanswered queries for this record, - // then mark it to expire in five seconds if we don't get a response by then. - if (cr->UnansweredQueries >= MaxUnansweredQueries) - { -#if ENABLE_MULTI_PACKET_QUERY_SNOOPING - // Only show debugging message if this record was not about to expire anyway - if (RRExpireTime(cr) - m->timenow > 4 * mDNSPlatformOneSecond) - debugf("ProcessQuery: (Max) UAQ %lu MPQ %lu MPKA %lu mDNS_Reconfirm() for %s", - cr->UnansweredQueries, cr->MPUnansweredQ, cr->MPUnansweredKA, CRDisplayString(m, cr)); -#endif - mDNS_Reconfirm_internal(m, cr, kDefaultReconfirmTimeForNoAnswer); - } -#if ENABLE_MULTI_PACKET_QUERY_SNOOPING - // Make a guess, based on the multi-packet query / known answer counts, whether we think we - // should have seen an answer for this. (We multiply MPQ by 4 and MPKA by 5, to allow for - // possible packet loss of up to 20% of the additional KA packets.) - else if (cr->MPUnansweredQ * 4 > cr->MPUnansweredKA * 5 + 8) - { - // We want to do this conservatively. - // If there are so many machines on the network that they have to use multi-packet known-answer lists, - // then we don't want them to all hit the network simultaneously with their final expiration queries. - // By setting the record to expire in four minutes, we achieve two things: - // (a) the 90-95% final expiration queries will be less bunched together - // (b) we allow some time for us to witness enough other failed queries that we don't have to do our own - mDNSu32 remain = (mDNSu32)(RRExpireTime(cr) - m->timenow) / 4; - if (remain > 240 * (mDNSu32)mDNSPlatformOneSecond) - remain = 240 * (mDNSu32)mDNSPlatformOneSecond; - - // Only show debugging message if this record was not about to expire anyway - if (RRExpireTime(cr) - m->timenow > 4 * mDNSPlatformOneSecond) - debugf("ProcessQuery: (MPQ) UAQ %lu MPQ %lu MPKA %lu mDNS_Reconfirm() for %s", - cr->UnansweredQueries, cr->MPUnansweredQ, cr->MPUnansweredKA, CRDisplayString(m, cr)); - - if (remain <= 60 * (mDNSu32)mDNSPlatformOneSecond) - cr->UnansweredQueries++; // Treat this as equivalent to one definite unanswered query - cr->MPUnansweredQ = 0; // Clear MPQ/MPKA statistics - cr->MPUnansweredKA = 0; - cr->MPExpectingKA = mDNSfalse; - - if (remain < kDefaultReconfirmTimeForNoAnswer) - remain = kDefaultReconfirmTimeForNoAnswer; - mDNS_Reconfirm_internal(m, cr, remain); - } -#endif - } - - while (DupQuestions) - { - DNSQuestion *q = DupQuestions; - DupQuestions = q->NextInDQList; - q->NextInDQList = mDNSNULL; - i = RecordDupSuppressInfo(q->DupSuppress, m->timenow, InterfaceID, srcaddr->type); - debugf("ProcessQuery: Recorded DSI for %##s (%s) on %p/%s %d", q->qname.c, DNSTypeName(q->qtype), InterfaceID, - srcaddr->type == mDNSAddrType_IPv4 ? "v4" : "v6", i); - } - - return(responseptr); - } - -mDNSlocal void mDNSCoreReceiveQuery(mDNS *const m, const DNSMessage *const msg, const mDNSu8 *const end, - const mDNSAddr *srcaddr, const mDNSIPPort srcport, const mDNSAddr *dstaddr, mDNSIPPort dstport, - const mDNSInterfaceID InterfaceID) - { - mDNSu8 *responseend = mDNSNULL; - mDNSBool QueryWasLocalUnicast = srcaddr && dstaddr && - !mDNSAddrIsDNSMulticast(dstaddr) && mDNS_AddressIsLocalSubnet(m, InterfaceID, srcaddr); - - if (!InterfaceID && dstaddr && mDNSAddrIsDNSMulticast(dstaddr)) - { - LogMsg("Ignoring Query from %#-15a:%-5d to %#-15a:%-5d on 0x%p with " - "%2d Question%s %2d Answer%s %2d Authorit%s %2d Additional%s %d bytes (Multicast, but no InterfaceID)", - srcaddr, mDNSVal16(srcport), dstaddr, mDNSVal16(dstport), InterfaceID, - msg->h.numQuestions, msg->h.numQuestions == 1 ? ", " : "s,", - msg->h.numAnswers, msg->h.numAnswers == 1 ? ", " : "s,", - msg->h.numAuthorities, msg->h.numAuthorities == 1 ? "y, " : "ies,", - msg->h.numAdditionals, msg->h.numAdditionals == 1 ? " " : "s", end - msg->data); - return; - } - - verbosedebugf("Received Query from %#-15a:%-5d to %#-15a:%-5d on 0x%p with " - "%2d Question%s %2d Answer%s %2d Authorit%s %2d Additional%s %d bytes", - srcaddr, mDNSVal16(srcport), dstaddr, mDNSVal16(dstport), InterfaceID, - msg->h.numQuestions, msg->h.numQuestions == 1 ? ", " : "s,", - msg->h.numAnswers, msg->h.numAnswers == 1 ? ", " : "s,", - msg->h.numAuthorities, msg->h.numAuthorities == 1 ? "y, " : "ies,", - msg->h.numAdditionals, msg->h.numAdditionals == 1 ? " " : "s", end - msg->data); - - responseend = ProcessQuery(m, msg, end, srcaddr, InterfaceID, - !mDNSSameIPPort(srcport, MulticastDNSPort), mDNSAddrIsDNSMulticast(dstaddr), QueryWasLocalUnicast, &m->omsg); - - if (responseend) // If responseend is non-null, that means we built a unicast response packet - { - debugf("Unicast Response: %d Question%s, %d Answer%s, %d Additional%s to %#-15a:%d on %p/%ld", - m->omsg.h.numQuestions, m->omsg.h.numQuestions == 1 ? "" : "s", - m->omsg.h.numAnswers, m->omsg.h.numAnswers == 1 ? "" : "s", - m->omsg.h.numAdditionals, m->omsg.h.numAdditionals == 1 ? "" : "s", - srcaddr, mDNSVal16(srcport), InterfaceID, srcaddr->type); - mDNSSendDNSMessage(m, &m->omsg, responseend, InterfaceID, mDNSNULL, srcaddr, srcport, mDNSNULL, mDNSNULL); - } - } - -#if 0 -mDNSlocal mDNSBool TrustedSource(const mDNS *const m, const mDNSAddr *const srcaddr) - { - DNSServer *s; - (void)m; // Unused - (void)srcaddr; // Unused - for (s = m->DNSServers; s; s = s->next) - if (mDNSSameAddress(srcaddr, &s->addr)) return(mDNStrue); - return(mDNSfalse); - } -#endif - -struct UDPSocket_struct - { - mDNSIPPort port; // MUST BE FIRST FIELD -- mDNSCoreReceive expects every UDPSocket_struct to begin with mDNSIPPort port - }; - -mDNSlocal DNSQuestion *ExpectingUnicastResponseForQuestion(const mDNS *const m, const mDNSIPPort port, const mDNSOpaque16 id, const DNSQuestion *const question, mDNSBool tcp) - { - DNSQuestion *q; - for (q = m->Questions; q; q=q->next) - { - if (!tcp && !q->LocalSocket) continue; - if (mDNSSameIPPort(tcp ? q->tcpSrcPort : q->LocalSocket->port, port) && - mDNSSameOpaque16(q->TargetQID, id) && - q->qtype == question->qtype && - q->qclass == question->qclass && - q->qnamehash == question->qnamehash && - SameDomainName(&q->qname, &question->qname)) - return(q); - } - return(mDNSNULL); - } - -// This function is called when we receive a unicast response. This could be the case of a unicast response from the -// DNS server or a response to the QU query. Hence, the cache record's InterfaceId can be both NULL or non-NULL (QU case) -mDNSlocal DNSQuestion *ExpectingUnicastResponseForRecord(mDNS *const m, - const mDNSAddr *const srcaddr, const mDNSBool SrcLocal, const mDNSIPPort port, const mDNSOpaque16 id, const CacheRecord *const rr, mDNSBool tcp) - { - DNSQuestion *q; - (void)id; - (void)srcaddr; - - for (q = m->Questions; q; q=q->next) - { - if (!q->DuplicateOf && ResourceRecordAnswersUnicastResponse(&rr->resrec, q)) - { - if (!mDNSOpaque16IsZero(q->TargetQID)) - { - debugf("ExpectingUnicastResponseForRecord msg->h.id %d q->TargetQID %d for %s", mDNSVal16(id), mDNSVal16(q->TargetQID), CRDisplayString(m, rr)); - - if (mDNSSameOpaque16(q->TargetQID, id)) - { - mDNSIPPort srcp; - if (!tcp) - { - srcp = q->LocalSocket ? q->LocalSocket->port : zeroIPPort; - } - else - { - srcp = q->tcpSrcPort; - } - if (mDNSSameIPPort(srcp, port)) return(q); - - // if (mDNSSameAddress(srcaddr, &q->Target)) return(mDNStrue); - // if (q->LongLived && mDNSSameAddress(srcaddr, &q->servAddr)) return(mDNStrue); Shouldn't need this now that we have LLQType checking - // if (TrustedSource(m, srcaddr)) return(mDNStrue); - LogInfo("WARNING: Ignoring suspect uDNS response for %##s (%s) [q->Target %#a:%d] from %#a:%d %s", - q->qname.c, DNSTypeName(q->qtype), &q->Target, mDNSVal16(srcp), srcaddr, mDNSVal16(port), CRDisplayString(m, rr)); - return(mDNSNULL); - } - } - else - { - if (SrcLocal && q->ExpectUnicastResp && (mDNSu32)(m->timenow - q->ExpectUnicastResp) < (mDNSu32)(mDNSPlatformOneSecond*2)) - return(q); - } - } - } - return(mDNSNULL); - } - -// Certain data types need more space for in-memory storage than their in-packet rdlength would imply -// Currently this applies only to rdata types containing more than one domainname, -// or types where the domainname is not the last item in the structure. -// In addition, NSEC currently requires less space for in-memory storage than its in-packet representation. -mDNSlocal mDNSu16 GetRDLengthMem(const ResourceRecord *const rr) - { - switch (rr->rrtype) - { - case kDNSType_SOA: return sizeof(rdataSOA); - case kDNSType_RP: return sizeof(rdataRP); - case kDNSType_PX: return sizeof(rdataPX); - case kDNSType_NSEC:return sizeof(rdataNSEC); - default: return rr->rdlength; - } - } - -mDNSexport CacheRecord *CreateNewCacheEntry(mDNS *const m, const mDNSu32 slot, CacheGroup *cg, mDNSs32 delay) - { - CacheRecord *rr = mDNSNULL; - mDNSu16 RDLength = GetRDLengthMem(&m->rec.r.resrec); - - if (!m->rec.r.resrec.InterfaceID) debugf("CreateNewCacheEntry %s", CRDisplayString(m, &m->rec.r)); - - //if (RDLength > InlineCacheRDSize) - // LogInfo("Rdata len %4d > InlineCacheRDSize %d %s", RDLength, InlineCacheRDSize, CRDisplayString(m, &m->rec.r)); - - if (!cg) cg = GetCacheGroup(m, slot, &m->rec.r.resrec); // If we don't have a CacheGroup for this name, make one now - if (cg) rr = GetCacheRecord(m, cg, RDLength); // Make a cache record, being careful not to recycle cg - if (!rr) NoCacheAnswer(m, &m->rec.r); - else - { - RData *saveptr = rr->resrec.rdata; // Save the rr->resrec.rdata pointer - *rr = m->rec.r; // Block copy the CacheRecord object - rr->resrec.rdata = saveptr; // Restore rr->resrec.rdata after the structure assignment - rr->resrec.name = cg->name; // And set rr->resrec.name to point into our CacheGroup header - rr->DelayDelivery = delay; - - // If this is an oversized record with external storage allocated, copy rdata to external storage - if (rr->resrec.rdata == (RData*)&rr->smallrdatastorage && RDLength > InlineCacheRDSize) - LogMsg("rr->resrec.rdata == &rr->rdatastorage but length > InlineCacheRDSize %##s", m->rec.r.resrec.name->c); - else if (rr->resrec.rdata != (RData*)&rr->smallrdatastorage && RDLength <= InlineCacheRDSize) - LogMsg("rr->resrec.rdata != &rr->rdatastorage but length <= InlineCacheRDSize %##s", m->rec.r.resrec.name->c); - if (RDLength > InlineCacheRDSize) - mDNSPlatformMemCopy(rr->resrec.rdata, m->rec.r.resrec.rdata, sizeofRDataHeader + RDLength); - - rr->next = mDNSNULL; // Clear 'next' pointer - *(cg->rrcache_tail) = rr; // Append this record to tail of cache slot list - cg->rrcache_tail = &(rr->next); // Advance tail pointer - - CacheRecordAdd(m, rr); // CacheRecordAdd calls SetNextCacheCheckTimeForRecord(m, rr); for us - } - return(rr); - } - -mDNSlocal void RefreshCacheRecord(mDNS *const m, CacheRecord *rr, mDNSu32 ttl) - { - rr->TimeRcvd = m->timenow; - rr->resrec.rroriginalttl = ttl; - rr->UnansweredQueries = 0; -#if ENABLE_MULTI_PACKET_QUERY_SNOOPING - rr->MPUnansweredQ = 0; - rr->MPUnansweredKA = 0; - rr->MPExpectingKA = mDNSfalse; -#endif - SetNextCacheCheckTimeForRecord(m, rr); - } - -mDNSexport void GrantCacheExtensions(mDNS *const m, DNSQuestion *q, mDNSu32 lease) - { - CacheRecord *rr; - const mDNSu32 slot = HashSlot(&q->qname); - CacheGroup *cg = CacheGroupForName(m, slot, q->qnamehash, &q->qname); - for (rr = cg ? cg->members : mDNSNULL; rr; rr=rr->next) - if (rr->CRActiveQuestion == q) - { - //LogInfo("GrantCacheExtensions: new lease %d / %s", lease, CRDisplayString(m, rr)); - RefreshCacheRecord(m, rr, lease); - } - } - -mDNSlocal mDNSu32 GetEffectiveTTL(const uDNS_LLQType LLQType, mDNSu32 ttl) // TTL in seconds - { - if (LLQType == uDNS_LLQ_Entire) ttl = kLLQ_DefLease; - else if (LLQType == uDNS_LLQ_Events) - { - // If the TTL is -1 for uDNS LLQ event packet, that means "remove" - if (ttl == 0xFFFFFFFF) ttl = 0; - else ttl = kLLQ_DefLease; - } - else // else not LLQ (standard uDNS response) - { - // The TTL is already capped to a maximum value in GetLargeResourceRecord, but just to be extra safe we - // also do this check here to make sure we can't get overflow below when we add a quarter to the TTL - if (ttl > 0x60000000UL / mDNSPlatformOneSecond) ttl = 0x60000000UL / mDNSPlatformOneSecond; - - // Adjustment factor to avoid race condition: - // Suppose real record as TTL of 3600, and our local caching server has held it for 3500 seconds, so it returns an aged TTL of 100. - // If we do our normal refresh at 80% of the TTL, our local caching server will return 20 seconds, so we'll do another - // 80% refresh after 16 seconds, and then the server will return 4 seconds, and so on, in the fashion of Zeno's paradox. - // To avoid this, we extend the record's effective TTL to give it a little extra grace period. - // We adjust the 100 second TTL to 126. This means that when we do our 80% query at 101 seconds, - // the cached copy at our local caching server will already have expired, so the server will be forced - // to fetch a fresh copy from the authoritative server, and then return a fresh record with the full TTL of 3600 seconds. - ttl += ttl/4 + 2; - - // For mDNS, TTL zero means "delete this record" - // For uDNS, TTL zero means: this data is true at this moment, but don't cache it. - // For the sake of network efficiency, we impose a minimum effective TTL of 15 seconds. - // This means that we'll do our 80, 85, 90, 95% queries at 12.00, 12.75, 13.50, 14.25 seconds - // respectively, and then if we get no response, delete the record from the cache at 15 seconds. - // This gives the server up to three seconds to respond between when we send our 80% query at 12 seconds - // and when we delete the record at 15 seconds. Allowing cache lifetimes less than 15 seconds would - // (with the current code) result in the server having even less than three seconds to respond - // before we deleted the record and reported a "remove" event to any active questions. - // Furthermore, with the current code, if we were to allow a TTL of less than 2 seconds - // then things really break (e.g. we end up making a negative cache entry). - // In the future we may want to revisit this and consider properly supporting non-cached (TTL=0) uDNS answers. - if (ttl < 15) ttl = 15; - } - - return ttl; - } - -// Note: mDNSCoreReceiveResponse calls mDNS_Deregister_internal which can call a user callback, which may change -// the record list and/or question list. -// Any code walking either list must use the CurrentQuestion and/or CurrentRecord mechanism to protect against this. -// InterfaceID non-NULL tells us the interface this multicast response was received on -// InterfaceID NULL tells us this was a unicast response -// dstaddr NULL tells us we received this over an outgoing TCP connection we made -mDNSlocal void mDNSCoreReceiveResponse(mDNS *const m, - const DNSMessage *const response, const mDNSu8 *end, - const mDNSAddr *srcaddr, const mDNSIPPort srcport, const mDNSAddr *dstaddr, mDNSIPPort dstport, - const mDNSInterfaceID InterfaceID) - { - int i; - mDNSBool ResponseMCast = dstaddr && mDNSAddrIsDNSMulticast(dstaddr); - mDNSBool ResponseSrcLocal = !srcaddr || mDNS_AddressIsLocalSubnet(m, InterfaceID, srcaddr); - DNSQuestion *llqMatch = mDNSNULL; - uDNS_LLQType LLQType = uDNS_recvLLQResponse(m, response, end, srcaddr, srcport, &llqMatch); - - // "(CacheRecord*)1" is a special (non-zero) end-of-list marker - // We use this non-zero marker so that records in our CacheFlushRecords list will always have NextInCFList - // set non-zero, and that tells GetCacheEntity() that they're not, at this moment, eligible for recycling. - CacheRecord *CacheFlushRecords = (CacheRecord*)1; - CacheRecord **cfp = &CacheFlushRecords; - - // All records in a DNS response packet are treated as equally valid statements of truth. If we want - // to guard against spoof responses, then the only credible protection against that is cryptographic - // security, e.g. DNSSEC., not worring about which section in the spoof packet contained the record - int firstauthority = response->h.numAnswers; - int firstadditional = firstauthority + response->h.numAuthorities; - int totalrecords = firstadditional + response->h.numAdditionals; - const mDNSu8 *ptr = response->data; - DNSServer *uDNSServer = mDNSNULL; - - debugf("Received Response from %#-15a addressed to %#-15a on %p with " - "%2d Question%s %2d Answer%s %2d Authorit%s %2d Additional%s %d bytes LLQType %d", - srcaddr, dstaddr, InterfaceID, - response->h.numQuestions, response->h.numQuestions == 1 ? ", " : "s,", - response->h.numAnswers, response->h.numAnswers == 1 ? ", " : "s,", - response->h.numAuthorities, response->h.numAuthorities == 1 ? "y, " : "ies,", - response->h.numAdditionals, response->h.numAdditionals == 1 ? " " : "s", end - response->data, LLQType); - - // According to RFC 2181 - // When a DNS client receives a reply with TC - // set, it should ignore that response, and query again, using a - // mechanism, such as a TCP connection, that will permit larger replies. - // It feels wrong to be throwing away data after the network went to all the trouble of delivering it to us, but - // delivering some records of the RRSet first and then the remainder a couple of milliseconds later was causing - // failures in our Microsoft Active Directory client, which expects to get the entire set of answers at once. - // Can't bind to Active Directory - // In addition, if the client immediately canceled its query after getting the initial partial response, then we'll - // abort our TCP connection, and not complete the operation, and end up with an incomplete RRSet in our cache. - // Next time there's a query for this RRSet we'll see answers in our cache, and assume we have the whole RRSet already, - // and not even do the TCP query. - // Accordingly, if we get a uDNS reply with kDNSFlag0_TC set, we bail out and wait for the TCP response containing the entire RRSet. - if (!InterfaceID && (response->h.flags.b[0] & kDNSFlag0_TC)) return; - - if (LLQType == uDNS_LLQ_Ignore) return; - - // 1. We ignore questions (if any) in mDNS response packets - // 2. If this is an LLQ response, we handle it much the same - // 3. If we get a uDNS UDP response with the TC (truncated) bit set, then we can't treat this - // answer as being the authoritative complete RRSet, and respond by deleting all other - // matching cache records that don't appear in this packet. - // Otherwise, this is a authoritative uDNS answer, so arrange for any stale records to be purged - if (ResponseMCast || LLQType == uDNS_LLQ_Events || (response->h.flags.b[0] & kDNSFlag0_TC)) - ptr = LocateAnswers(response, end); - // Otherwise, for one-shot queries, any answers in our cache that are not also contained - // in this response packet are immediately deemed to be invalid. - else - { - mDNSu8 rcode = (mDNSu8)(response->h.flags.b[1] & kDNSFlag1_RC_Mask); - mDNSBool failure = !(rcode == kDNSFlag1_RC_NoErr || rcode == kDNSFlag1_RC_NXDomain || rcode == kDNSFlag1_RC_NotAuth); - mDNSBool returnEarly = mDNSfalse; - // We could possibly combine this with the similar loop at the end of this function -- - // instead of tagging cache records here and then rescuing them if we find them in the answer section, - // we could instead use the "m->PktNum" mechanism to tag each cache record with the packet number in - // which it was received (or refreshed), and then at the end if we find any cache records which - // answer questions in this packet's question section, but which aren't tagged with this packet's - // packet number, then we deduce they are old and delete them - for (i = 0; i < response->h.numQuestions && ptr && ptr < end; i++) - { - DNSQuestion q, *qptr = mDNSNULL; - ptr = getQuestion(response, ptr, end, InterfaceID, &q); - if (ptr && (qptr = ExpectingUnicastResponseForQuestion(m, dstport, response->h.id, &q, !dstaddr))) - { - if (!failure) - { - CacheRecord *rr; - const mDNSu32 slot = HashSlot(&q.qname); - CacheGroup *cg = CacheGroupForName(m, slot, q.qnamehash, &q.qname); - for (rr = cg ? cg->members : mDNSNULL; rr; rr=rr->next) - if (SameNameRecordAnswersQuestion(&rr->resrec, qptr)) - { - debugf("uDNS marking %p %##s (%s) %p %s", q.InterfaceID, q.qname.c, DNSTypeName(q.qtype), - rr->resrec.InterfaceID, CRDisplayString(m, rr)); - // Don't want to disturb rroriginalttl here, because code below might need it for the exponential backoff doubling algorithm - rr->TimeRcvd = m->timenow - TicksTTL(rr) - 1; - rr->UnansweredQueries = MaxUnansweredQueries; - } - } - else - { - if (qptr) - { - LogInfo("mDNSCoreReceiveResponse: Server %p responded with code %d to query %##s (%s)", qptr->qDNSServer, rcode, q.qname.c, DNSTypeName(q.qtype)); - PenalizeDNSServer(m, qptr); - } - returnEarly = mDNStrue; - } - } - } - if (returnEarly) - { - LogInfo("Ignoring %2d Answer%s %2d Authorit%s %2d Additional%s", - response->h.numAnswers, response->h.numAnswers == 1 ? ", " : "s,", - response->h.numAuthorities, response->h.numAuthorities == 1 ? "y, " : "ies,", - response->h.numAdditionals, response->h.numAdditionals == 1 ? "" : "s"); - // not goto exit because we won't have any CacheFlushRecords and we do not want to - // generate negative cache entries (we want to query the next server) - return; - } - } - - for (i = 0; i < totalrecords && ptr && ptr < end; i++) - { - // All responses sent via LL multicast are acceptable for caching - // All responses received over our outbound TCP connections are acceptable for caching - mDNSBool AcceptableResponse = ResponseMCast || !dstaddr || LLQType; - // (Note that just because we are willing to cache something, that doesn't necessarily make it a trustworthy answer - // to any specific question -- any code reading records from the cache needs to make that determination for itself.) - - const mDNSu8 RecordType = - (i < firstauthority ) ? (mDNSu8)kDNSRecordTypePacketAns : - (i < firstadditional) ? (mDNSu8)kDNSRecordTypePacketAuth : (mDNSu8)kDNSRecordTypePacketAdd; - ptr = GetLargeResourceRecord(m, response, ptr, end, InterfaceID, RecordType, &m->rec); - if (!ptr) goto exit; // Break out of the loop and clean up our CacheFlushRecords list before exiting - if (m->rec.r.resrec.RecordType == kDNSRecordTypePacketNegative) { m->rec.r.resrec.RecordType = 0; continue; } - - // Don't want to cache OPT or TSIG pseudo-RRs - if (m->rec.r.resrec.rrtype == kDNSType_TSIG) { m->rec.r.resrec.RecordType = 0; continue; } - if (m->rec.r.resrec.rrtype == kDNSType_OPT) - { - const rdataOPT *opt; - const rdataOPT *const e = (const rdataOPT *)&m->rec.r.resrec.rdata->u.data[m->rec.r.resrec.rdlength]; - // Find owner sub-option(s). We verify that the MAC is non-zero, otherwise we could inadvertently - // delete all our own AuthRecords (which are identified by having zero MAC tags on them). - for (opt = &m->rec.r.resrec.rdata->u.opt[0]; opt < e; opt++) - if (opt->opt == kDNSOpt_Owner && opt->u.owner.vers == 0 && opt->u.owner.HMAC.l[0]) - { - ClearProxyRecords(m, &opt->u.owner, m->DuplicateRecords); - ClearProxyRecords(m, &opt->u.owner, m->ResourceRecords); - } - m->rec.r.resrec.RecordType = 0; - continue; - } - - // if a CNAME record points to itself, then don't add it to the cache - if ((m->rec.r.resrec.rrtype == kDNSType_CNAME) && SameDomainName(m->rec.r.resrec.name, &m->rec.r.resrec.rdata->u.name)) - { - LogInfo("mDNSCoreReceiveResponse: CNAME loop domain name %##s", m->rec.r.resrec.name->c); - m->rec.r.resrec.RecordType = 0; - continue; - } - - // When we receive uDNS LLQ responses, we assume a long cache lifetime -- - // In the case of active LLQs, we'll get remove events when the records actually do go away - // In the case of polling LLQs, we assume the record remains valid until the next poll - if (!mDNSOpaque16IsZero(response->h.id)) - m->rec.r.resrec.rroriginalttl = GetEffectiveTTL(LLQType, m->rec.r.resrec.rroriginalttl); - - // If response was not sent via LL multicast, - // then see if it answers a recent query of ours, which would also make it acceptable for caching. - if (!ResponseMCast) - { - if (LLQType) - { - // For Long Lived queries that are both sent over UDP and Private TCP, LLQType is set. - // Even though it is AcceptableResponse, we need a matching DNSServer pointer for the - // queries to get ADD/RMV events. To lookup the question, we can't use - // ExpectingUnicastResponseForRecord as the port numbers don't match. uDNS_recvLLQRespose - // has already matched the question using the 64 bit Id in the packet and we use that here. - - if (llqMatch != mDNSNULL) m->rec.r.resrec.rDNSServer = uDNSServer = llqMatch->qDNSServer; - } - else if (!AcceptableResponse || !dstaddr) - { - // For responses that come over TCP (Responses that can't fit within UDP) or TLS (Private queries - // that are not long lived e.g., AAAA lookup in a Private domain), it is indicated by !dstaddr. - // Even though it is AcceptableResponse, we still need a DNSServer pointer for the resource records that - // we create. - - DNSQuestion *q = ExpectingUnicastResponseForRecord(m, srcaddr, ResponseSrcLocal, dstport, response->h.id, &m->rec.r, !dstaddr); - - // Intialize the DNS server on the resource record which will now filter what questions we answer with - // this record. - // - // We could potentially lookup the DNS server based on the source address, but that may not work always - // and that's why ExpectingUnicastResponseForRecord does not try to verify whether the response came - // from the DNS server that queried. We follow the same logic here. If we can find a matching quetion based - // on the "id" and "source port", then this response answers the question and assume the response - // came from the same DNS server that we sent the query to. - - if (q != mDNSNULL) - { - AcceptableResponse = mDNStrue; - if (!InterfaceID) - { - debugf("mDNSCoreReceiveResponse: InterfaceID %p %##s (%s)", q->InterfaceID, q->qname.c, DNSTypeName(q->qtype)); - m->rec.r.resrec.rDNSServer = uDNSServer = q->qDNSServer; - } - } - else - { - // If we can't find a matching question, we need to see whether we have seen records earlier that matched - // the question. The code below does that. So, make this record unacceptable for now - if (!InterfaceID) - { - debugf("mDNSCoreReceiveResponse: Can't find question for record name %##s", m->rec.r.resrec.name->c); - AcceptableResponse = mDNSfalse; - } - } - } - } - - // 1. Check that this packet resource record does not conflict with any of ours - if (mDNSOpaque16IsZero(response->h.id) && m->rec.r.resrec.rrtype != kDNSType_NSEC) - { - if (m->CurrentRecord) - LogMsg("mDNSCoreReceiveResponse ERROR m->CurrentRecord already set %s", ARDisplayString(m, m->CurrentRecord)); - m->CurrentRecord = m->ResourceRecords; - while (m->CurrentRecord) - { - AuthRecord *rr = m->CurrentRecord; - m->CurrentRecord = rr->next; - // We accept all multicast responses, and unicast responses resulting from queries we issued - // For other unicast responses, this code accepts them only for responses with an - // (apparently) local source address that pertain to a record of our own that's in probing state - if (!AcceptableResponse && !(ResponseSrcLocal && rr->resrec.RecordType == kDNSRecordTypeUnique)) continue; - - if (PacketRRMatchesSignature(&m->rec.r, rr)) // If interface, name, type (if shared record) and class match... - { - // ... check to see if type and rdata are identical - if (IdenticalSameNameRecord(&m->rec.r.resrec, &rr->resrec)) - { - // If the RR in the packet is identical to ours, just check they're not trying to lower the TTL on us - if (m->rec.r.resrec.rroriginalttl >= rr->resrec.rroriginalttl/2 || m->SleepState) - { - // If we were planning to send on this -- and only this -- interface, then we don't need to any more - if (rr->ImmedAnswer == InterfaceID) { rr->ImmedAnswer = mDNSNULL; rr->ImmedUnicast = mDNSfalse; } - } - else - { - if (rr->ImmedAnswer == mDNSNULL) { rr->ImmedAnswer = InterfaceID; m->NextScheduledResponse = m->timenow; } - else if (rr->ImmedAnswer != InterfaceID) { rr->ImmedAnswer = mDNSInterfaceMark; m->NextScheduledResponse = m->timenow; } - } - } - // else, the packet RR has different type or different rdata -- check to see if this is a conflict - else if (m->rec.r.resrec.rroriginalttl > 0 && PacketRRConflict(m, rr, &m->rec.r)) - { - LogInfo("mDNSCoreReceiveResponse: Pkt Record: %08lX %s", m->rec.r.resrec.rdatahash, CRDisplayString(m, &m->rec.r)); - LogInfo("mDNSCoreReceiveResponse: Our Record: %08lX %s", rr-> resrec.rdatahash, ARDisplayString(m, rr)); - - // If this record is marked DependentOn another record for conflict detection purposes, - // then *that* record has to be bumped back to probing state to resolve the conflict - if (rr->DependentOn) - { - while (rr->DependentOn) rr = rr->DependentOn; - LogInfo("mDNSCoreReceiveResponse: Dep Record: %08lX %s", rr-> resrec.rdatahash, ARDisplayString(m, rr)); - } - - // If we've just whacked this record's ProbeCount, don't need to do it again - if (rr->ProbeCount > DefaultProbeCountForTypeUnique) - LogInfo("mDNSCoreReceiveResponse: Already reset to Probing: %s", ARDisplayString(m, rr)); - else if (rr->ProbeCount == DefaultProbeCountForTypeUnique) - LogMsg("mDNSCoreReceiveResponse: Ignoring response received before we even began probing: %s", ARDisplayString(m, rr)); - else - { - LogMsg("mDNSCoreReceiveResponse: Received from %#a:%d %s", srcaddr, mDNSVal16(srcport), CRDisplayString(m, &m->rec.r)); - // If we'd previously verified this record, put it back to probing state and try again - if (rr->resrec.RecordType == kDNSRecordTypeVerified) - { - LogMsg("mDNSCoreReceiveResponse: Resetting to Probing: %s", ARDisplayString(m, rr)); - rr->resrec.RecordType = kDNSRecordTypeUnique; - // We set ProbeCount to one more than the usual value so we know we've already touched this record. - // This is because our single probe for "example-name.local" could yield a response with (say) two A records and - // three AAAA records in it, and we don't want to call RecordProbeFailure() five times and count that as five conflicts. - // This special value is recognised and reset to DefaultProbeCountForTypeUnique in SendQueries(). - rr->ProbeCount = DefaultProbeCountForTypeUnique + 1; - rr->AnnounceCount = InitialAnnounceCount; - InitializeLastAPTime(m, rr); - RecordProbeFailure(m, rr); // Repeated late conflicts also cause us to back off to the slower probing rate - } - // If we're probing for this record, we just failed - else if (rr->resrec.RecordType == kDNSRecordTypeUnique) - { - LogMsg("mDNSCoreReceiveResponse: ProbeCount %d; will deregister %s", rr->ProbeCount, ARDisplayString(m, rr)); - mDNS_Deregister_internal(m, rr, mDNS_Dereg_conflict); - } - // We assumed this record must be unique, but we were wrong. (e.g. There are two mDNSResponders on the - // same machine giving different answers for the reverse mapping record, or there are two machines on the - // network using the same IP address.) This is simply a misconfiguration, and there's nothing we can do - // to fix it -- e.g. it's not our job to be trying to change the machine's IP address. We just discard our - // record to avoid continued conflicts (as we do for a conflict on our Unique records) and get on with life. - else if (rr->resrec.RecordType == kDNSRecordTypeKnownUnique) - { - LogMsg("mDNSCoreReceiveResponse: Unexpected conflict discarding %s", ARDisplayString(m, rr)); - mDNS_Deregister_internal(m, rr, mDNS_Dereg_conflict); - } - else - LogMsg("mDNSCoreReceiveResponse: Unexpected record type %X %s", rr->resrec.RecordType, ARDisplayString(m, rr)); - } - } - // Else, matching signature, different type or rdata, but not a considered a conflict. - // If the packet record has the cache-flush bit set, then we check to see if we - // have any record(s) of the same type that we should re-assert to rescue them - // (see note about "multi-homing and bridged networks" at the end of this function). - else if (m->rec.r.resrec.rrtype == rr->resrec.rrtype) - if ((m->rec.r.resrec.RecordType & kDNSRecordTypePacketUniqueMask) && m->timenow - rr->LastMCTime > mDNSPlatformOneSecond/2) - { rr->ImmedAnswer = mDNSInterfaceMark; m->NextScheduledResponse = m->timenow; } - } - } - } - - if (!AcceptableResponse) - { - const CacheRecord *cr; - for (cr = CacheFlushRecords; cr != (CacheRecord*)1; cr = cr->NextInCFList) - { - domainname *target = GetRRDomainNameTarget(&cr->resrec); - // When we issue a query for A record, the response might contain both a CNAME and A records. Only the CNAME would - // match the question and we already created a cache entry in the previous pass of this loop. Now when we process - // the A record, it does not match the question because the record name here is the CNAME. Hence we try to - // match with the previous records to make it an AcceptableResponse. We have to be careful about setting the - // DNSServer value that we got in the previous pass. This can happen for other record types like SRV also. - - if (target && cr->resrec.rdatahash == m->rec.r.resrec.namehash && SameDomainName(target, m->rec.r.resrec.name)) - { - debugf("mDNSCoreReceiveResponse: Found a matching entry for %##s in the CacheFlushRecords", m->rec.r.resrec.name->c); - AcceptableResponse = mDNStrue; - m->rec.r.resrec.rDNSServer = uDNSServer; - break; - } - } - } - - // 2. See if we want to add this packet resource record to our cache - // We only try to cache answers if we have a cache to put them in - // Also, we ignore any apparent attempts at cache poisoning unicast to us that do not answer any outstanding active query - if (!AcceptableResponse) LogInfo("mDNSCoreReceiveResponse ignoring %s", CRDisplayString(m, &m->rec.r)); - if (m->rrcache_size && AcceptableResponse) - { - const mDNSu32 slot = HashSlot(m->rec.r.resrec.name); - CacheGroup *cg = CacheGroupForRecord(m, slot, &m->rec.r.resrec); - CacheRecord *rr; - - // 2a. Check if this packet resource record is already in our cache - for (rr = cg ? cg->members : mDNSNULL; rr; rr=rr->next) - { - mDNSBool match = !InterfaceID ? m->rec.r.resrec.rDNSServer == rr->resrec.rDNSServer : rr->resrec.InterfaceID == InterfaceID; - // If we found this exact resource record, refresh its TTL - if (match && IdenticalSameNameRecord(&m->rec.r.resrec, &rr->resrec)) - { - if (m->rec.r.resrec.rdlength > InlineCacheRDSize) - verbosedebugf("Found record size %5d interface %p already in cache: %s", - m->rec.r.resrec.rdlength, InterfaceID, CRDisplayString(m, &m->rec.r)); - - if (m->rec.r.resrec.RecordType & kDNSRecordTypePacketUniqueMask) - { - // If this packet record has the kDNSClass_UniqueRRSet flag set, then add it to our cache flushing list - if (rr->NextInCFList == mDNSNULL && cfp != &rr->NextInCFList && LLQType != uDNS_LLQ_Events) - { *cfp = rr; cfp = &rr->NextInCFList; *cfp = (CacheRecord*)1; } - - // If this packet record is marked unique, and our previous cached copy was not, then fix it - if (!(rr->resrec.RecordType & kDNSRecordTypePacketUniqueMask)) - { - DNSQuestion *q; - for (q = m->Questions; q; q=q->next) if (ResourceRecordAnswersQuestion(&rr->resrec, q)) q->UniqueAnswers++; - rr->resrec.RecordType = m->rec.r.resrec.RecordType; - } - } - - if (!SameRDataBody(&m->rec.r.resrec, &rr->resrec.rdata->u, SameDomainNameCS)) - { - // If the rdata of the packet record differs in name capitalization from the record in our cache - // then mDNSPlatformMemSame will detect this. In this case, throw the old record away, so that clients get - // a 'remove' event for the record with the old capitalization, and then an 'add' event for the new one. - // mDNS -F returns the same domain multiple times with different casing - rr->resrec.rroriginalttl = 0; - rr->TimeRcvd = m->timenow; - rr->UnansweredQueries = MaxUnansweredQueries; - SetNextCacheCheckTimeForRecord(m, rr); - LogInfo("Discarding due to domainname case change old: %s", CRDisplayString(m,rr)); - LogInfo("Discarding due to domainname case change new: %s", CRDisplayString(m,&m->rec.r)); - LogInfo("Discarding due to domainname case change in %d slot %3d in %d %d", - NextCacheCheckEvent(rr) - m->timenow, slot, m->rrcache_nextcheck[slot] - m->timenow, m->NextCacheCheck - m->timenow); - // DO NOT break out here -- we want to continue as if we never found it - } - else if (m->rec.r.resrec.rroriginalttl > 0) - { - DNSQuestion *q; - //if (rr->resrec.rroriginalttl == 0) LogMsg("uDNS rescuing %s", CRDisplayString(m, rr)); - RefreshCacheRecord(m, rr, m->rec.r.resrec.rroriginalttl); - - // We have to reset the question interval to MaxQuestionInterval so that we don't keep - // polling the network once we get a valid response back. For the first time when a new - // cache entry is created, AnswerCurrentQuestionWithResourceRecord does that. - // Subsequently, if we reissue questions from within the mDNSResponder e.g., DNS server - // configuration changed, without flushing the cache, we reset the question interval here. - // Currently, we do this for for both multicast and unicast questions as long as the record - // type is unique. For unicast, resource record is always unique and for multicast it is - // true for records like A etc. but not for PTR. - if (rr->resrec.RecordType & kDNSRecordTypePacketUniqueMask) - { - for (q = m->Questions; q; q=q->next) - { - if (!q->DuplicateOf && !q->LongLived && - ActiveQuestion(q) && ResourceRecordAnswersQuestion(&rr->resrec, q)) - { - ResetQuestionState(m, q); - debugf("mDNSCoreReceiveResponse: Set MaxQuestionInterval for %p %##s (%s)", q, q->qname.c, DNSTypeName(q->qtype)); - break; // Why break here? Aren't there other questions we might want to look at?-- SC July 2010 - } - } - } - break; - } - else - { - // If the packet TTL is zero, that means we're deleting this record. - // To give other hosts on the network a chance to protest, we push the deletion - // out one second into the future. Also, we set UnansweredQueries to MaxUnansweredQueries. - // Otherwise, we'll do final queries for this record at 80% and 90% of its apparent - // lifetime (800ms and 900ms from now) which is a pointless waste of network bandwidth. - // If record's current expiry time is more than a second from now, we set it to expire in one second. - // If the record is already going to expire in less than one second anyway, we leave it alone -- - // we don't want to let the goodbye packet *extend* the record's lifetime in our cache. - debugf("DE for %s", CRDisplayString(m, rr)); - if (RRExpireTime(rr) - m->timenow > mDNSPlatformOneSecond) - { - rr->resrec.rroriginalttl = 1; - rr->TimeRcvd = m->timenow; - rr->UnansweredQueries = MaxUnansweredQueries; - SetNextCacheCheckTimeForRecord(m, rr); - } - break; - } - } - } - - // If packet resource record not in our cache, add it now - // (unless it is just a deletion of a record we never had, in which case we don't care) - if (!rr && m->rec.r.resrec.rroriginalttl > 0) - { - const mDNSBool AddToCFList = (m->rec.r.resrec.RecordType & kDNSRecordTypePacketUniqueMask) && (LLQType != uDNS_LLQ_Events); - const mDNSs32 delay = AddToCFList ? NonZeroTime(m->timenow + mDNSPlatformOneSecond) : - CheckForSoonToExpireRecords(m, m->rec.r.resrec.name, m->rec.r.resrec.namehash, slot); - // If unique, assume we may have to delay delivery of this 'add' event. - // Below, where we walk the CacheFlushRecords list, we either call CacheRecordDeferredAdd() - // to immediately to generate answer callbacks, or we call ScheduleNextCacheCheckTime() - // to schedule an mDNS_Execute task at the appropriate time. - rr = CreateNewCacheEntry(m, slot, cg, delay); - if (rr) - { - if (AddToCFList) { *cfp = rr; cfp = &rr->NextInCFList; *cfp = (CacheRecord*)1; } - else if (rr->DelayDelivery) ScheduleNextCacheCheckTime(m, slot, rr->DelayDelivery); - } - } - } - m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it - } - -exit: - m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it - - // If we've just received one or more records with their cache flush bits set, - // then scan that cache slot to see if there are any old stale records we need to flush - while (CacheFlushRecords != (CacheRecord*)1) - { - CacheRecord *r1 = CacheFlushRecords, *r2; - const mDNSu32 slot = HashSlot(r1->resrec.name); - const CacheGroup *cg = CacheGroupForRecord(m, slot, &r1->resrec); - CacheFlushRecords = CacheFlushRecords->NextInCFList; - r1->NextInCFList = mDNSNULL; - - // Look for records in the cache with the same signature as this new one with the cache flush - // bit set, and either (a) if they're fresh, just make sure the whole RRSet has the same TTL - // (as required by DNS semantics) or (b) if they're old, mark them for deletion in one second. - // We make these TTL adjustments *only* for records that still have *more* than one second - // remaining to live. Otherwise, a record that we tagged for deletion half a second ago - // (and now has half a second remaining) could inadvertently get its life extended, by either - // (a) if we got an explicit goodbye packet half a second ago, the record would be considered - // "fresh" and would be incorrectly resurrected back to the same TTL as the rest of the RRSet, - // or (b) otherwise, the record would not be fully resurrected, but would be reset to expire - // in one second, thereby inadvertently delaying its actual expiration, instead of hastening it. - // If this were to happen repeatedly, the record's expiration could be deferred indefinitely. - // To avoid this, we need to ensure that the cache flushing operation will only act to - // *decrease* a record's remaining lifetime, never *increase* it. - for (r2 = cg ? cg->members : mDNSNULL; r2; r2=r2->next) - // For Unicast (null InterfaceID) the DNSservers should also match - if ((r1->resrec.InterfaceID == r2->resrec.InterfaceID) && - (r1->resrec.InterfaceID || (r1->resrec.rDNSServer == r2->resrec.rDNSServer)) && - r1->resrec.rrtype == r2->resrec.rrtype && - r1->resrec.rrclass == r2->resrec.rrclass) - { - // If record is recent, just ensure the whole RRSet has the same TTL (as required by DNS semantics) - // else, if record is old, mark it to be flushed - if (m->timenow - r2->TimeRcvd < mDNSPlatformOneSecond && RRExpireTime(r2) - m->timenow > mDNSPlatformOneSecond) - { - // If we find mismatched TTLs in an RRSet, correct them. - // We only do this for records with a TTL of 2 or higher. It's possible to have a - // goodbye announcement with the cache flush bit set (or a case-change on record rdata, - // which we treat as a goodbye followed by an addition) and in that case it would be - // inappropriate to synchronize all the other records to a TTL of 0 (or 1). - // We suppress the message for the specific case of correcting from 240 to 60 for type TXT, - // because certain early Bonjour devices are known to have this specific mismatch, and - // there's no point filling syslog with messages about something we already know about. - // We also don't log this for uDNS responses, since a caching name server is obliged - // to give us an aged TTL to correct for how long it has held the record, - // so our received TTLs are expected to vary in that case - if (r2->resrec.rroriginalttl != r1->resrec.rroriginalttl && r1->resrec.rroriginalttl > 1) - { - if (!(r2->resrec.rroriginalttl == 240 && r1->resrec.rroriginalttl == 60 && r2->resrec.rrtype == kDNSType_TXT) && - mDNSOpaque16IsZero(response->h.id)) - LogInfo("Correcting TTL from %4d to %4d for %s", - r2->resrec.rroriginalttl, r1->resrec.rroriginalttl, CRDisplayString(m, r2)); - r2->resrec.rroriginalttl = r1->resrec.rroriginalttl; - } - r2->TimeRcvd = m->timenow; - } - else // else, if record is old, mark it to be flushed - { - verbosedebugf("Cache flush new %p age %d expire in %d %s", r1, m->timenow - r1->TimeRcvd, RRExpireTime(r1) - m->timenow, CRDisplayString(m, r1)); - verbosedebugf("Cache flush old %p age %d expire in %d %s", r2, m->timenow - r2->TimeRcvd, RRExpireTime(r2) - m->timenow, CRDisplayString(m, r2)); - // We set stale records to expire in one second. - // This gives the owner a chance to rescue it if necessary. - // This is important in the case of multi-homing and bridged networks: - // Suppose host X is on Ethernet. X then connects to an AirPort base station, which happens to be - // bridged onto the same Ethernet. When X announces its AirPort IP address with the cache-flush bit - // set, the AirPort packet will be bridged onto the Ethernet, and all other hosts on the Ethernet - // will promptly delete their cached copies of the (still valid) Ethernet IP address record. - // By delaying the deletion by one second, we give X a change to notice that this bridging has - // happened, and re-announce its Ethernet IP address to rescue it from deletion from all our caches. - - // We set UnansweredQueries to MaxUnansweredQueries to avoid expensive and unnecessary - // final expiration queries for this record. - - // If a record is deleted twice, first with an explicit DE record, then a second time by virtue of the cache - // flush bit on the new record replacing it, then we allow the record to be deleted immediately, without the usual - // one-second grace period. This improves responsiveness for mDNS_Update(), as used for things like iChat status updates. - // Updating TXT records is too slow - // We check for "rroriginalttl == 1" because we want to include records tagged by the "packet TTL is zero" check above, - // which sets rroriginalttl to 1, but not records tagged by the rdata case-change check, which sets rroriginalttl to 0. - if (r2->TimeRcvd == m->timenow && r2->resrec.rroriginalttl == 1 && r2->UnansweredQueries == MaxUnansweredQueries) - { - LogInfo("Cache flush for DE record %s", CRDisplayString(m, r2)); - r2->resrec.rroriginalttl = 0; - } - else if (RRExpireTime(r2) - m->timenow > mDNSPlatformOneSecond) - { - // We only set a record to expire in one second if it currently has *more* than a second to live - // If it's already due to expire in a second or less, we just leave it alone - r2->resrec.rroriginalttl = 1; - r2->UnansweredQueries = MaxUnansweredQueries; - r2->TimeRcvd = m->timenow - 1; - // We use (m->timenow - 1) instead of m->timenow, because we use that to identify records - // that we marked for deletion via an explicit DE record - } - } - SetNextCacheCheckTimeForRecord(m, r2); - } - - if (r1->DelayDelivery) // If we were planning to delay delivery of this record, see if we still need to - { - r1->DelayDelivery = CheckForSoonToExpireRecords(m, r1->resrec.name, r1->resrec.namehash, slot); - // If no longer delaying, deliver answer now, else schedule delivery for the appropriate time - if (!r1->DelayDelivery) CacheRecordDeferredAdd(m, r1); - else ScheduleNextCacheCheckTime(m, slot, r1->DelayDelivery); - } - } - - // See if we need to generate negative cache entries for unanswered unicast questions - ptr = response->data; - for (i = 0; i < response->h.numQuestions && ptr && ptr < end; i++) - { - DNSQuestion q; - DNSQuestion *qptr = mDNSNULL; - ptr = getQuestion(response, ptr, end, InterfaceID, &q); - if (ptr && (qptr = ExpectingUnicastResponseForQuestion(m, dstport, response->h.id, &q, !dstaddr))) - { - CacheRecord *rr, *neg = mDNSNULL; - mDNSu32 slot = HashSlot(&q.qname); - CacheGroup *cg = CacheGroupForName(m, slot, q.qnamehash, &q.qname); - for (rr = cg ? cg->members : mDNSNULL; rr; rr=rr->next) - if (SameNameRecordAnswersQuestion(&rr->resrec, qptr)) - { - // 1. If we got a fresh answer to this query, then don't need to generate a negative entry - if (RRExpireTime(rr) - m->timenow > 0) break; - // 2. If we already had a negative entry, keep track of it so we can resurrect it instead of creating a new one - if (rr->resrec.RecordType == kDNSRecordTypePacketNegative) neg = rr; - } - // When we're doing parallel unicast and multicast queries for dot-local names (for supporting Microsoft - // Active Directory sites) we don't want to waste memory making negative cache entries for all the unicast answers. - // Otherwise we just fill up our cache with negative entries for just about every single multicast name we ever look up - // (since the Microsoft Active Directory server is going to assert that pretty much every single multicast name doesn't exist). - // This is not only a waste of memory, but there's also the problem of those negative entries confusing us later -- e.g. we - // suppress sending our mDNS query packet because we think we already have a valid (negative) answer to that query in our cache. - // The one exception is that we *DO* want to make a negative cache entry for "local. SOA", for the (common) case where we're - // *not* on a Microsoft Active Directory network, and there is no authoritative server for "local". Note that this is not - // in conflict with the mDNS spec, because that spec says, "Multicast DNS Zones have no SOA record," so it's okay to cache - // negative answers for "local. SOA" from a uDNS server, because the mDNS spec already says that such records do not exist :-) - if (!InterfaceID && q.qtype != kDNSType_SOA && IsLocalDomain(&q.qname)) - { - // If we did not find a positive answer and we can append search domains to this question, - // generate a negative response (without creating a cache entry) to append search domains. - if (qptr->AppendSearchDomains && !rr) - { - LogInfo("mDNSCoreReceiveResponse: Generate negative response for %##s (%s)", q.qname.c, DNSTypeName(q.qtype)); - m->CurrentQuestion = qptr; - GenerateNegativeResponse(m); - m->CurrentQuestion = mDNSNULL; - } - else LogInfo("mDNSCoreReceiveResponse: Skipping check to see if we need to generate a negative cache entry for %##s (%s)", q.qname.c, DNSTypeName(q.qtype)); - } - else - { - if (!rr) - { - // We start off assuming a negative caching TTL of 60 seconds - // but then look to see if we can find an SOA authority record to tell us a better value we should be using - mDNSu32 negttl = 60; - int repeat = 0; - const domainname *name = &q.qname; - mDNSu32 hash = q.qnamehash; - - // Special case for our special Microsoft Active Directory "local SOA" check. - // Some cheap home gateways don't include an SOA record in the authority section when - // they send negative responses, so we don't know how long to cache the negative result. - // Because we don't want to keep hitting the root name servers with our query to find - // if we're on a network using Microsoft Active Directory using "local" as a private - // internal top-level domain, we make sure to cache the negative result for at least one day. - if (q.qtype == kDNSType_SOA && SameDomainName(&q.qname, &localdomain)) negttl = 60 * 60 * 24; - - // If we're going to make (or update) a negative entry, then look for the appropriate TTL from the SOA record - if (response->h.numAuthorities && (ptr = LocateAuthorities(response, end)) != mDNSNULL) - { - ptr = GetLargeResourceRecord(m, response, ptr, end, InterfaceID, kDNSRecordTypePacketAuth, &m->rec); - if (ptr && m->rec.r.resrec.RecordType != kDNSRecordTypePacketNegative && m->rec.r.resrec.rrtype == kDNSType_SOA) - { - const rdataSOA *const soa = (const rdataSOA *)m->rec.r.resrec.rdata->u.data; - mDNSu32 ttl_s = soa->min; - // We use the lesser of the SOA.MIN field and the SOA record's TTL, *except* - // for the SOA record for ".", where the record is reported as non-cacheable - // (TTL zero) for some reason, so in this case we just take the SOA record's TTL as-is - if (ttl_s > m->rec.r.resrec.rroriginalttl && m->rec.r.resrec.name->c[0]) - ttl_s = m->rec.r.resrec.rroriginalttl; - if (negttl < ttl_s) negttl = ttl_s; - - // Special check for SOA queries: If we queried for a.b.c.d.com, and got no answer, - // with an Authority Section SOA record for d.com, then this is a hint that the authority - // is d.com, and consequently SOA records b.c.d.com and c.d.com don't exist either. - // To do this we set the repeat count so the while loop below will make a series of negative cache entries for us - if (q.qtype == kDNSType_SOA) - { - int qcount = CountLabels(&q.qname); - int scount = CountLabels(m->rec.r.resrec.name); - if (qcount - 1 > scount) - if (SameDomainName(SkipLeadingLabels(&q.qname, qcount - scount), m->rec.r.resrec.name)) - repeat = qcount - 1 - scount; - } - } - m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it - } - - // If we already had a negative entry in the cache, then we double our existing negative TTL. This is to avoid - // the case where the record doesn't exist (e.g. particularly for things like our lb._dns-sd._udp. query), - // and the server returns no SOA record (or an SOA record with a small MIN TTL) so we assume a TTL - // of 60 seconds, and we end up polling the server every minute for a record that doesn't exist. - // With this fix in place, when this happens, we double the effective TTL each time (up to one hour), - // so that we back off our polling rate and don't keep hitting the server continually. - if (neg) - { - if (negttl < neg->resrec.rroriginalttl * 2) - negttl = neg->resrec.rroriginalttl * 2; - if (negttl > 3600) - negttl = 3600; - } - - negttl = GetEffectiveTTL(LLQType, negttl); // Add 25% grace period if necessary - - // If we already had a negative cache entry just update it, else make one or more new negative cache entries - if (neg) - { - debugf("mDNSCoreReceiveResponse: Renewing negative TTL from %d to %d %s", neg->resrec.rroriginalttl, negttl, CRDisplayString(m, neg)); - RefreshCacheRecord(m, neg, negttl); - // When we created the cache for the first time and answered the question, the question's - // interval was set to MaxQuestionInterval. If the cache is about to expire and we are resending - // the queries, the interval should still be at MaxQuestionInterval. If the query is being - // restarted (setting it to InitialQuestionInterval) for other reasons e.g., wakeup, - // we should reset its question interval here to MaxQuestionInterval. - ResetQuestionState(m, qptr); - } - else while (1) - { - debugf("mDNSCoreReceiveResponse making negative cache entry TTL %d for %##s (%s)", negttl, name->c, DNSTypeName(q.qtype)); - MakeNegativeCacheRecord(m, &m->rec.r, name, hash, q.qtype, q.qclass, negttl, mDNSInterface_Any, qptr->qDNSServer); - CreateNewCacheEntry(m, slot, cg, 0); // We never need any delivery delay for these generated negative cache records - m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it - if (!repeat) break; - repeat--; - name = (const domainname *)(name->c + 1 + name->c[0]); - hash = DomainNameHashValue(name); - slot = HashSlot(name); - cg = CacheGroupForName(m, slot, hash, name); - } - } - } - } - } - } - -// ScheduleWakeup causes all proxy records with WakeUp.HMAC matching mDNSEthAddr 'e' to be deregistered, causing -// multiple wakeup magic packets to be sent if appropriate, and all records to be ultimately freed after a few seconds. -// ScheduleWakeup is called on mDNS record conflicts, ARP conflicts, NDP conflicts, or reception of trigger traffic -// that warrants waking the sleeping host. -// ScheduleWakeup must be called with the lock held (ScheduleWakeupForList uses mDNS_Deregister_internal) - -mDNSlocal void ScheduleWakeupForList(mDNS *const m, mDNSInterfaceID InterfaceID, mDNSEthAddr *e, AuthRecord *const thelist) - { - // We don't need to use the m->CurrentRecord mechanism here because the target HMAC is nonzero, - // so all we're doing is marking the record to generate a few wakeup packets - AuthRecord *rr; - if (!e->l[0]) { LogMsg("ScheduleWakeupForList ERROR: Target HMAC is zero"); return; } - for (rr = thelist; rr; rr = rr->next) - if (rr->resrec.InterfaceID == InterfaceID && rr->resrec.RecordType != kDNSRecordTypeDeregistering && mDNSSameEthAddress(&rr->WakeUp.HMAC, e)) - { - LogInfo("ScheduleWakeupForList: Scheduling wakeup packets for %s", ARDisplayString(m, rr)); - mDNS_Deregister_internal(m, rr, mDNS_Dereg_normal); - } - } - -mDNSlocal void ScheduleWakeup(mDNS *const m, mDNSInterfaceID InterfaceID, mDNSEthAddr *e) - { - if (!e->l[0]) { LogMsg("ScheduleWakeup ERROR: Target HMAC is zero"); return; } - ScheduleWakeupForList(m, InterfaceID, e, m->DuplicateRecords); - ScheduleWakeupForList(m, InterfaceID, e, m->ResourceRecords); - } - -mDNSlocal void SPSRecordCallback(mDNS *const m, AuthRecord *const ar, mStatus result) - { - if (result && result != mStatus_MemFree) - LogInfo("SPS Callback %d %s", result, ARDisplayString(m, ar)); - - if (result == mStatus_NameConflict) - { - mDNS_Lock(m); - LogMsg("%-7s Conflicting mDNS -- waking %.6a %s", InterfaceNameForID(m, ar->resrec.InterfaceID), &ar->WakeUp.HMAC, ARDisplayString(m, ar)); - if (ar->WakeUp.HMAC.l[0]) - { - SendWakeup(m, ar->resrec.InterfaceID, &ar->WakeUp.IMAC, &ar->WakeUp.password); // Send one wakeup magic packet - ScheduleWakeup(m, ar->resrec.InterfaceID, &ar->WakeUp.HMAC); // Schedule all other records with the same owner to be woken - } - mDNS_Unlock(m); - } - - if (result == mStatus_NameConflict || result == mStatus_MemFree) - { - m->ProxyRecords--; - mDNSPlatformMemFree(ar); - mDNS_UpdateAllowSleep(m); - } - } - -mDNSlocal void mDNSCoreReceiveUpdate(mDNS *const m, - const DNSMessage *const msg, const mDNSu8 *end, - const mDNSAddr *srcaddr, const mDNSIPPort srcport, const mDNSAddr *dstaddr, mDNSIPPort dstport, - const mDNSInterfaceID InterfaceID) - { - int i; - AuthRecord opt; - mDNSu8 *p = m->omsg.data; - OwnerOptData owner = zeroOwner; // Need to zero this, so we'll know if this Update packet was missing its Owner option - mDNSu32 updatelease = 0; - const mDNSu8 *ptr; - - LogSPS("Received Update from %#-15a:%-5d to %#-15a:%-5d on 0x%p with " - "%2d Question%s %2d Answer%s %2d Authorit%s %2d Additional%s %d bytes", - srcaddr, mDNSVal16(srcport), dstaddr, mDNSVal16(dstport), InterfaceID, - msg->h.numQuestions, msg->h.numQuestions == 1 ? ", " : "s,", - msg->h.numAnswers, msg->h.numAnswers == 1 ? ", " : "s,", - msg->h.numAuthorities, msg->h.numAuthorities == 1 ? "y, " : "ies,", - msg->h.numAdditionals, msg->h.numAdditionals == 1 ? " " : "s", end - msg->data); - - if (!InterfaceID || !m->SPSSocket || !mDNSSameIPPort(dstport, m->SPSSocket->port)) return; - - if (mDNS_PacketLoggingEnabled) - DumpPacket(m, mStatus_NoError, mDNSfalse, "UDP", srcaddr, srcport, dstaddr, dstport, msg, end); - - ptr = LocateOptRR(msg, end, DNSOpt_LeaseData_Space + DNSOpt_OwnerData_ID_Space); - if (ptr) - { - ptr = GetLargeResourceRecord(m, msg, ptr, end, 0, kDNSRecordTypePacketAdd, &m->rec); - if (ptr && m->rec.r.resrec.RecordType != kDNSRecordTypePacketNegative && m->rec.r.resrec.rrtype == kDNSType_OPT) - { - const rdataOPT *o; - const rdataOPT *const e = (const rdataOPT *)&m->rec.r.resrec.rdata->u.data[m->rec.r.resrec.rdlength]; - for (o = &m->rec.r.resrec.rdata->u.opt[0]; o < e; o++) - { - if (o->opt == kDNSOpt_Lease) updatelease = o->u.updatelease; - else if (o->opt == kDNSOpt_Owner && o->u.owner.vers == 0) owner = o->u.owner; - } - } - m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it - } - - InitializeDNSMessage(&m->omsg.h, msg->h.id, UpdateRespFlags); - - if (!updatelease || !owner.HMAC.l[0]) - { - static int msgs = 0; - if (msgs < 100) - { - msgs++; - LogMsg("Refusing sleep proxy registration from %#a:%d:%s%s", srcaddr, mDNSVal16(srcport), - !updatelease ? " No lease" : "", !owner.HMAC.l[0] ? " No owner" : ""); - } - m->omsg.h.flags.b[1] |= kDNSFlag1_RC_FormErr; - } - else if (m->ProxyRecords + msg->h.mDNS_numUpdates > MAX_PROXY_RECORDS) - { - static int msgs = 0; - if (msgs < 100) - { - msgs++; - LogMsg("Refusing sleep proxy registration from %#a:%d: Too many records %d + %d = %d > %d", srcaddr, mDNSVal16(srcport), - m->ProxyRecords, msg->h.mDNS_numUpdates, m->ProxyRecords + msg->h.mDNS_numUpdates, MAX_PROXY_RECORDS); - } - m->omsg.h.flags.b[1] |= kDNSFlag1_RC_Refused; - } - else - { - LogSPS("Received Update for H-MAC %.6a I-MAC %.6a Password %.6a seq %d", &owner.HMAC, &owner.IMAC, &owner.password, owner.seq); - - if (updatelease > 24 * 60 * 60) - updatelease = 24 * 60 * 60; - - if (updatelease > 0x40000000UL / mDNSPlatformOneSecond) - updatelease = 0x40000000UL / mDNSPlatformOneSecond; - - ptr = LocateAuthorities(msg, end); - for (i = 0; i < msg->h.mDNS_numUpdates && ptr && ptr < end; i++) - { - ptr = GetLargeResourceRecord(m, msg, ptr, end, InterfaceID, kDNSRecordTypePacketAuth, &m->rec); - if (ptr && m->rec.r.resrec.RecordType != kDNSRecordTypePacketNegative) - { - mDNSu16 RDLengthMem = GetRDLengthMem(&m->rec.r.resrec); - AuthRecord *ar = mDNSPlatformMemAllocate(sizeof(AuthRecord) - sizeof(RDataBody) + RDLengthMem); - if (!ar) { m->omsg.h.flags.b[1] |= kDNSFlag1_RC_Refused; break; } - else - { - mDNSu8 RecordType = m->rec.r.resrec.RecordType & kDNSRecordTypePacketUniqueMask ? kDNSRecordTypeUnique : kDNSRecordTypeShared; - m->rec.r.resrec.rrclass &= ~kDNSClass_UniqueRRSet; - ClearIdenticalProxyRecords(m, &owner, m->DuplicateRecords); // Make sure we don't have any old stale duplicates of this record - ClearIdenticalProxyRecords(m, &owner, m->ResourceRecords); - mDNS_SetupResourceRecord(ar, mDNSNULL, InterfaceID, m->rec.r.resrec.rrtype, m->rec.r.resrec.rroriginalttl, RecordType, AuthRecordAny, SPSRecordCallback, ar); - AssignDomainName(&ar->namestorage, m->rec.r.resrec.name); - ar->resrec.rdlength = GetRDLength(&m->rec.r.resrec, mDNSfalse); - ar->resrec.rdata->MaxRDLength = RDLengthMem; - mDNSPlatformMemCopy(ar->resrec.rdata->u.data, m->rec.r.resrec.rdata->u.data, RDLengthMem); - ar->ForceMCast = mDNStrue; - ar->WakeUp = owner; - if (m->rec.r.resrec.rrtype == kDNSType_PTR) - { - mDNSs32 t = ReverseMapDomainType(m->rec.r.resrec.name); - if (t == mDNSAddrType_IPv4) GetIPv4FromName(&ar->AddressProxy, m->rec.r.resrec.name); - else if (t == mDNSAddrType_IPv6) GetIPv6FromName(&ar->AddressProxy, m->rec.r.resrec.name); - debugf("mDNSCoreReceiveUpdate: PTR %d %d %#a %s", t, ar->AddressProxy.type, &ar->AddressProxy, ARDisplayString(m, ar)); - if (ar->AddressProxy.type) SetSPSProxyListChanged(InterfaceID); - } - ar->TimeRcvd = m->timenow; - ar->TimeExpire = m->timenow + updatelease * mDNSPlatformOneSecond; - if (m->NextScheduledSPS - ar->TimeExpire > 0) - m->NextScheduledSPS = ar->TimeExpire; - mDNS_Register_internal(m, ar); - // Unsolicited Neighbor Advertisements (RFC 2461 Section 7.2.6) give us fast address cache updating, - // but some older IPv6 clients get confused by them, so for now we don't send them. Without Unsolicited - // Neighbor Advertisements we have to rely on Neighbor Unreachability Detection instead, which is slower. - // Given this, we'll do our best to wake for existing IPv6 connections, but we don't want to encourage - // new ones for sleeping clients, so we'll we send deletions for our SPS clients' AAAA records. - if (m->KnownBugs & mDNS_KnownBug_LimitedIPv6) - if (ar->resrec.rrtype == kDNSType_AAAA) ar->resrec.rroriginalttl = 0; - m->ProxyRecords++; - mDNS_UpdateAllowSleep(m); - LogSPS("SPS Registered %4d %X %s", m->ProxyRecords, RecordType, ARDisplayString(m,ar)); - } - } - m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it - } - - if (m->omsg.h.flags.b[1] & kDNSFlag1_RC_Mask) - { - LogMsg("Refusing sleep proxy registration from %#a:%d: Out of memory", srcaddr, mDNSVal16(srcport)); - ClearProxyRecords(m, &owner, m->DuplicateRecords); - ClearProxyRecords(m, &owner, m->ResourceRecords); - } - else - { - mDNS_SetupResourceRecord(&opt, mDNSNULL, mDNSInterface_Any, kDNSType_OPT, kStandardTTL, kDNSRecordTypeKnownUnique, AuthRecordAny, mDNSNULL, mDNSNULL); - opt.resrec.rrclass = NormalMaxDNSMessageData; - opt.resrec.rdlength = sizeof(rdataOPT); // One option in this OPT record - opt.resrec.rdestimate = sizeof(rdataOPT); - opt.resrec.rdata->u.opt[0].opt = kDNSOpt_Lease; - opt.resrec.rdata->u.opt[0].u.updatelease = updatelease; - p = PutResourceRecordTTLWithLimit(&m->omsg, p, &m->omsg.h.numAdditionals, &opt.resrec, opt.resrec.rroriginalttl, m->omsg.data + AbsoluteMaxDNSMessageData); - } - } - - if (p) mDNSSendDNSMessage(m, &m->omsg, p, InterfaceID, m->SPSSocket, srcaddr, srcport, mDNSNULL, mDNSNULL); - } - -mDNSlocal void mDNSCoreReceiveUpdateR(mDNS *const m, const DNSMessage *const msg, const mDNSu8 *end, const mDNSInterfaceID InterfaceID) - { - if (InterfaceID) - { - mDNSu32 updatelease = 60 * 60; // If SPS fails to indicate lease time, assume one hour - const mDNSu8 *ptr = LocateOptRR(msg, end, DNSOpt_LeaseData_Space); - if (ptr) - { - ptr = GetLargeResourceRecord(m, msg, ptr, end, 0, kDNSRecordTypePacketAdd, &m->rec); - if (ptr && m->rec.r.resrec.RecordType != kDNSRecordTypePacketNegative && m->rec.r.resrec.rrtype == kDNSType_OPT) - { - const rdataOPT *o; - const rdataOPT *const e = (const rdataOPT *)&m->rec.r.resrec.rdata->u.data[m->rec.r.resrec.rdlength]; - for (o = &m->rec.r.resrec.rdata->u.opt[0]; o < e; o++) - if (o->opt == kDNSOpt_Lease) - { - updatelease = o->u.updatelease; - LogSPS("Sleep Proxy granted lease time %4d seconds", updatelease); - } - } - m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it - } - - if (m->CurrentRecord) - LogMsg("mDNSCoreReceiveUpdateR ERROR m->CurrentRecord already set %s", ARDisplayString(m, m->CurrentRecord)); - m->CurrentRecord = m->ResourceRecords; - while (m->CurrentRecord) - { - AuthRecord *const rr = m->CurrentRecord; - if (rr->resrec.InterfaceID == InterfaceID || (!rr->resrec.InterfaceID && (rr->ForceMCast || IsLocalDomain(rr->resrec.name)))) - if (mDNSSameOpaque16(rr->updateid, msg->h.id)) - { - rr->updateid = zeroID; - rr->expire = NonZeroTime(m->timenow + updatelease * mDNSPlatformOneSecond); - LogSPS("Sleep Proxy %s record %5d %s", rr->WakeUp.HMAC.l[0] ? "transferred" : "registered", updatelease, ARDisplayString(m,rr)); - if (rr->WakeUp.HMAC.l[0]) - { - rr->WakeUp.HMAC = zeroEthAddr; // Clear HMAC so that mDNS_Deregister_internal doesn't waste packets trying to wake this host - rr->RequireGoodbye = mDNSfalse; // and we don't want to send goodbye for it - mDNS_Deregister_internal(m, rr, mDNS_Dereg_normal); - } - } - // Mustn't advance m->CurrentRecord until *after* mDNS_Deregister_internal, because - // new records could have been added to the end of the list as a result of that call. - if (m->CurrentRecord == rr) // If m->CurrentRecord was not advanced for us, do it now - m->CurrentRecord = rr->next; - } - } - // If we were waiting to go to sleep, then this SPS registration or wide-area record deletion - // may have been the thing we were waiting for, so schedule another check to see if we can sleep now. - if (m->SleepLimit) m->NextScheduledSPRetry = m->timenow; - } - -mDNSexport void MakeNegativeCacheRecord(mDNS *const m, CacheRecord *const cr, - const domainname *const name, const mDNSu32 namehash, const mDNSu16 rrtype, const mDNSu16 rrclass, mDNSu32 ttl_seconds, mDNSInterfaceID InterfaceID, DNSServer *dnsserver) - { - if (cr == &m->rec.r && m->rec.r.resrec.RecordType) - { - LogMsg("MakeNegativeCacheRecord: m->rec appears to be already in use for %s", CRDisplayString(m, &m->rec.r)); -#if ForceAlerts - *(long*)0 = 0; -#endif - } - - // Create empty resource record - cr->resrec.RecordType = kDNSRecordTypePacketNegative; - cr->resrec.InterfaceID = InterfaceID; - cr->resrec.rDNSServer = dnsserver; - cr->resrec.name = name; // Will be updated to point to cg->name when we call CreateNewCacheEntry - cr->resrec.rrtype = rrtype; - cr->resrec.rrclass = rrclass; - cr->resrec.rroriginalttl = ttl_seconds; - cr->resrec.rdlength = 0; - cr->resrec.rdestimate = 0; - cr->resrec.namehash = namehash; - cr->resrec.rdatahash = 0; - cr->resrec.rdata = (RData*)&cr->smallrdatastorage; - cr->resrec.rdata->MaxRDLength = 0; - - cr->NextInKAList = mDNSNULL; - cr->TimeRcvd = m->timenow; - cr->DelayDelivery = 0; - cr->NextRequiredQuery = m->timenow; - cr->LastUsed = m->timenow; - cr->CRActiveQuestion = mDNSNULL; - cr->UnansweredQueries = 0; - cr->LastUnansweredTime = 0; -#if ENABLE_MULTI_PACKET_QUERY_SNOOPING - cr->MPUnansweredQ = 0; - cr->MPLastUnansweredQT = 0; - cr->MPUnansweredKA = 0; - cr->MPExpectingKA = mDNSfalse; -#endif - cr->NextInCFList = mDNSNULL; - } - -mDNSexport void mDNSCoreReceive(mDNS *const m, void *const pkt, const mDNSu8 *const end, - const mDNSAddr *const srcaddr, const mDNSIPPort srcport, const mDNSAddr *dstaddr, const mDNSIPPort dstport, - const mDNSInterfaceID InterfaceID) - { - mDNSInterfaceID ifid = InterfaceID; - DNSMessage *msg = (DNSMessage *)pkt; - const mDNSu8 StdQ = kDNSFlag0_QR_Query | kDNSFlag0_OP_StdQuery; - const mDNSu8 StdR = kDNSFlag0_QR_Response | kDNSFlag0_OP_StdQuery; - const mDNSu8 UpdQ = kDNSFlag0_QR_Query | kDNSFlag0_OP_Update; - const mDNSu8 UpdR = kDNSFlag0_QR_Response | kDNSFlag0_OP_Update; - mDNSu8 QR_OP; - mDNSu8 *ptr = mDNSNULL; - mDNSBool TLS = (dstaddr == (mDNSAddr *)1); // For debug logs: dstaddr = 0 means TCP; dstaddr = 1 means TLS - if (TLS) dstaddr = mDNSNULL; - -#ifndef UNICAST_DISABLED - if (mDNSSameAddress(srcaddr, &m->Router)) - { -#ifdef _LEGACY_NAT_TRAVERSAL_ - if (mDNSSameIPPort(srcport, SSDPPort) || (m->SSDPSocket && mDNSSameIPPort(dstport, m->SSDPSocket->port))) - { - mDNS_Lock(m); - LNT_ConfigureRouterInfo(m, InterfaceID, pkt, (mDNSu16)(end - (mDNSu8 *)pkt)); - mDNS_Unlock(m); - return; - } -#endif - if (mDNSSameIPPort(srcport, NATPMPPort)) - { - mDNS_Lock(m); - uDNS_ReceiveNATPMPPacket(m, InterfaceID, pkt, (mDNSu16)(end - (mDNSu8 *)pkt)); - mDNS_Unlock(m); - return; - } - } -#ifdef _LEGACY_NAT_TRAVERSAL_ - else if (m->SSDPSocket && mDNSSameIPPort(dstport, m->SSDPSocket->port)) { debugf("Ignoring SSDP response from %#a:%d", srcaddr, mDNSVal16(srcport)); return; } -#endif - -#endif - if ((unsigned)(end - (mDNSu8 *)pkt) < sizeof(DNSMessageHeader)) - { - LogMsg("DNS Message from %#a:%d to %#a:%d length %d too short", srcaddr, mDNSVal16(srcport), dstaddr, mDNSVal16(dstport), end - (mDNSu8 *)pkt); - return; - } - QR_OP = (mDNSu8)(msg->h.flags.b[0] & kDNSFlag0_QROP_Mask); - // Read the integer parts which are in IETF byte-order (MSB first, LSB second) - ptr = (mDNSu8 *)&msg->h.numQuestions; - msg->h.numQuestions = (mDNSu16)((mDNSu16)ptr[0] << 8 | ptr[1]); - msg->h.numAnswers = (mDNSu16)((mDNSu16)ptr[2] << 8 | ptr[3]); - msg->h.numAuthorities = (mDNSu16)((mDNSu16)ptr[4] << 8 | ptr[5]); - msg->h.numAdditionals = (mDNSu16)((mDNSu16)ptr[6] << 8 | ptr[7]); - - if (!m) { LogMsg("mDNSCoreReceive ERROR m is NULL"); return; } - - // We use zero addresses and all-ones addresses at various places in the code to indicate special values like "no address" - // If we accept and try to process a packet with zero or all-ones source address, that could really mess things up - if (srcaddr && !mDNSAddressIsValid(srcaddr)) { debugf("mDNSCoreReceive ignoring packet from %#a", srcaddr); return; } - - mDNS_Lock(m); - m->PktNum++; -#ifndef UNICAST_DISABLED - if (!dstaddr || (!mDNSAddressIsAllDNSLinkGroup(dstaddr) && (QR_OP == StdR || QR_OP == UpdR))) - if (!mDNSOpaque16IsZero(msg->h.id)) // uDNS_ReceiveMsg only needs to get real uDNS responses, not "QU" mDNS responses - { - ifid = mDNSInterface_Any; - if (mDNS_PacketLoggingEnabled) - DumpPacket(m, mStatus_NoError, mDNSfalse, TLS ? "TLS" : !dstaddr ? "TCP" : "UDP", srcaddr, srcport, dstaddr, dstport, msg, end); - uDNS_ReceiveMsg(m, msg, end, srcaddr, srcport); - // Note: mDNSCore also needs to get access to received unicast responses - } -#endif - if (QR_OP == StdQ) mDNSCoreReceiveQuery (m, msg, end, srcaddr, srcport, dstaddr, dstport, ifid); - else if (QR_OP == StdR) mDNSCoreReceiveResponse(m, msg, end, srcaddr, srcport, dstaddr, dstport, ifid); - else if (QR_OP == UpdQ) mDNSCoreReceiveUpdate (m, msg, end, srcaddr, srcport, dstaddr, dstport, InterfaceID); - else if (QR_OP == UpdR) mDNSCoreReceiveUpdateR (m, msg, end, InterfaceID); - else - { - LogMsg("Unknown DNS packet type %02X%02X from %#-15a:%-5d to %#-15a:%-5d length %d on %p (ignored)", - msg->h.flags.b[0], msg->h.flags.b[1], srcaddr, mDNSVal16(srcport), dstaddr, mDNSVal16(dstport), end - (mDNSu8 *)pkt, InterfaceID); - if (mDNS_LoggingEnabled) - { - int i = 0; - while (iTarget.type == mDNSAddrType_None && (B)->Target.type == mDNSAddrType_None) || \ - (mDNSSameAddress(&(A)->Target, &(B)->Target) && mDNSSameIPPort((A)->TargetPort, (B)->TargetPort))) - -// Note: We explicitly disallow making a public query be a duplicate of a private one. This is to avoid the -// circular deadlock where a client does a query for something like "dns-sd -Q _dns-query-tls._tcp.company.com SRV" -// and we have a key for company.com, so we try to locate the private query server for company.com, which necessarily entails -// doing a standard DNS query for the _dns-query-tls._tcp SRV record for company.com. If we make the latter (public) query -// a duplicate of the former (private) query, then it will block forever waiting for an answer that will never come. -// -// We keep SuppressUnusable questions separate so that we can return a quick response to them and not get blocked behind -// the queries that are not marked SuppressUnusable. But if the query is not suppressed, they are treated the same as -// non-SuppressUnusable questions. This should be fine as the goal of SuppressUnusable is to return quickly only if it -// is suppressed. If it is not suppressed, we do try all the DNS servers for valid answers like any other question. -// The main reason for this design is that cache entries point to a *single* question and that question is responsible -// for keeping the cache fresh as long as it is active. Having multiple active question for a single cache entry -// breaks this design principle. - -// If IsLLQ(Q) is true, it means the question is both: -// (a) long-lived and -// (b) being performed by a unicast DNS long-lived query (either full LLQ, or polling) -// for multicast questions, we don't want to treat LongLived as anything special -#define IsLLQ(Q) ((Q)->LongLived && !mDNSOpaque16IsZero((Q)->TargetQID)) - -mDNSlocal DNSQuestion *FindDuplicateQuestion(const mDNS *const m, const DNSQuestion *const question) - { - DNSQuestion *q; - // Note: A question can only be marked as a duplicate of one that occurs *earlier* in the list. - // This prevents circular references, where two questions are each marked as a duplicate of the other. - // Accordingly, we break out of the loop when we get to 'question', because there's no point searching - // further in the list. - for (q = m->Questions; q && q != question; q=q->next) // Scan our list for another question - if (q->InterfaceID == question->InterfaceID && // with the same InterfaceID, - SameQTarget(q, question) && // and same unicast/multicast target settings - q->qtype == question->qtype && // type, - q->qclass == question->qclass && // class, - IsLLQ(q) == IsLLQ(question) && // and long-lived status matches - (!q->AuthInfo || question->AuthInfo) && // to avoid deadlock, don't make public query dup of a private one - (q->SuppressQuery == question->SuppressQuery) && // Questions that are suppressed/not suppressed - q->qnamehash == question->qnamehash && - SameDomainName(&q->qname, &question->qname)) // and name - return(q); - return(mDNSNULL); - } - -// This is called after a question is deleted, in case other identical questions were being suppressed as duplicates -mDNSlocal void UpdateQuestionDuplicates(mDNS *const m, DNSQuestion *const question) - { - DNSQuestion *q; - DNSQuestion *first = mDNSNULL; - - // This is referring to some other question as duplicate. No other question can refer to this - // question as a duplicate. - if (question->DuplicateOf) - { - LogInfo("UpdateQuestionDuplicates: question %p %##s (%s) duplicate of %p %##s (%s)", - question, question->qname.c, DNSTypeName(question->qtype), - question->DuplicateOf, question->DuplicateOf->qname.c, DNSTypeName(question->DuplicateOf->qtype)); - return; - } - - for (q = m->Questions; q; q=q->next) // Scan our list of questions - if (q->DuplicateOf == question) // To see if any questions were referencing this as their duplicate - { - q->DuplicateOf = first; - if (!first) - { - first = q; - // If q used to be a duplicate, but now is not, - // then inherit the state from the question that's going away - q->LastQTime = question->LastQTime; - q->ThisQInterval = question->ThisQInterval; - q->ExpectUnicastResp = question->ExpectUnicastResp; - q->LastAnswerPktNum = question->LastAnswerPktNum; - q->RecentAnswerPkts = question->RecentAnswerPkts; - q->RequestUnicast = question->RequestUnicast; - q->LastQTxTime = question->LastQTxTime; - q->CNAMEReferrals = question->CNAMEReferrals; - q->nta = question->nta; - q->servAddr = question->servAddr; - q->servPort = question->servPort; - q->qDNSServer = question->qDNSServer; - q->validDNSServers = question->validDNSServers; - q->unansweredQueries = question->unansweredQueries; - q->noServerResponse = question->noServerResponse; - q->triedAllServersOnce = question->triedAllServersOnce; - - q->TargetQID = question->TargetQID; - q->LocalSocket = question->LocalSocket; - - q->state = question->state; - // q->tcp = question->tcp; - q->ReqLease = question->ReqLease; - q->expire = question->expire; - q->ntries = question->ntries; - q->id = question->id; - - question->LocalSocket = mDNSNULL; - question->nta = mDNSNULL; // If we've got a GetZoneData in progress, transfer it to the newly active question - // question->tcp = mDNSNULL; - - if (q->LocalSocket) - debugf("UpdateQuestionDuplicates transferred LocalSocket pointer for %##s (%s)", q->qname.c, DNSTypeName(q->qtype)); - - if (q->nta) - { - LogInfo("UpdateQuestionDuplicates transferred nta pointer for %##s (%s)", q->qname.c, DNSTypeName(q->qtype)); - q->nta->ZoneDataContext = q; - } - - // Need to work out how to safely transfer this state too -- appropriate context pointers need to be updated or the code will crash - if (question->tcp) LogInfo("UpdateQuestionDuplicates did not transfer tcp pointer"); - - if (question->state == LLQ_Established) - { - LogInfo("UpdateQuestionDuplicates transferred LLQ state for %##s (%s)", q->qname.c, DNSTypeName(q->qtype)); - question->state = 0; // Must zero question->state, or mDNS_StopQuery_internal will clean up and cancel our LLQ from the server - } - - SetNextQueryTime(m,q); - } - } - } - -mDNSexport McastResolver *mDNS_AddMcastResolver(mDNS *const m, const domainname *d, const mDNSInterfaceID interface, mDNSu32 timeout) - { - McastResolver **p = &m->McastResolvers; - McastResolver *tmp = mDNSNULL; - - if (!d) d = (const domainname *)""; - - LogInfo("mDNS_AddMcastResolver: Adding %##s, InterfaceID %p, timeout %u", d->c, interface, timeout); - - if (m->mDNS_busy != m->mDNS_reentrancy+1) - LogMsg("mDNS_AddMcastResolver: Lock not held! mDNS_busy (%ld) mDNS_reentrancy (%ld)", m->mDNS_busy, m->mDNS_reentrancy); - - while (*p) // Check if we already have this {interface, domain} tuple registered - { - if ((*p)->interface == interface && SameDomainName(&(*p)->domain, d)) - { - if (!((*p)->flags & DNSServer_FlagDelete)) LogMsg("Note: Mcast Resolver domain %##s (%p) registered more than once", d->c, interface); - (*p)->flags &= ~DNSServer_FlagDelete; - tmp = *p; - *p = tmp->next; - tmp->next = mDNSNULL; - } - else - p=&(*p)->next; - } - - if (tmp) *p = tmp; // move to end of list, to ensure ordering from platform layer - else - { - // allocate, add to list - *p = mDNSPlatformMemAllocate(sizeof(**p)); - if (!*p) LogMsg("mDNS_AddMcastResolver: ERROR!! - malloc"); - else - { - (*p)->interface = interface; - (*p)->flags = DNSServer_FlagNew; - (*p)->timeout = timeout; - AssignDomainName(&(*p)->domain, d); - (*p)->next = mDNSNULL; - } - } - return(*p); - } - -mDNSinline mDNSs32 PenaltyTimeForServer(mDNS *m, DNSServer *server) - { - mDNSs32 ptime = 0; - if (server->penaltyTime != 0) - { - ptime = server->penaltyTime - m->timenow; - if (ptime < 0) - { - // This should always be a positive value between 0 and DNSSERVER_PENALTY_TIME - // If it does not get reset in ResetDNSServerPenalties for some reason, we do it - // here - LogMsg("PenaltyTimeForServer: PenaltyTime negative %d, (server penaltyTime %d, timenow %d) resetting the penalty", - ptime, server->penaltyTime, m->timenow); - server->penaltyTime = 0; - ptime = 0; - } - } - return ptime; - } - -//Checks to see whether the newname is a better match for the name, given the best one we have -//seen so far (given in bestcount). -//Returns -1 if the newname is not a better match -//Returns 0 if the newname is the same as the old match -//Returns 1 if the newname is a better match -mDNSlocal int BetterMatchForName(const domainname *name, int namecount, const domainname *newname, int newcount, - int bestcount) - { - // If the name contains fewer labels than the new server's domain or the new name - // contains fewer labels than the current best, then it can't possibly be a better match - if (namecount < newcount || newcount < bestcount) return -1; - - // If there is no match, return -1 and the caller will skip this newname for - // selection - // - // If we find a match and the number of labels is the same as bestcount, then - // we return 0 so that the caller can do additional logic to pick one of - // the best based on some other factors e.g., penaltyTime - // - // If we find a match and the number of labels is more than bestcount, then we - // return 1 so that the caller can pick this over the old one. - // - // Note: newcount can either be equal or greater than bestcount beause of the - // check above. - - if (SameDomainName(SkipLeadingLabels(name, namecount - newcount), newname)) - return bestcount == newcount ? 0 : 1; - else - return -1; - } - -// Normally, we have McastResolvers for .local, in-addr.arpa and ip6.arpa. But there -// can be queries that can forced to multicast (ForceMCast) even though they don't end in these -// names. In that case, we give a default timeout of 5 seconds -#define DEFAULT_MCAST_TIMEOUT 5 -mDNSlocal mDNSu32 GetTimeoutForMcastQuestion(mDNS *m, DNSQuestion *question) - { - McastResolver *curmatch = mDNSNULL; - int bestmatchlen = -1, namecount = CountLabels(&question->qname); - McastResolver *curr; - int bettermatch, currcount; - for (curr = m->McastResolvers; curr; curr = curr->next) - { - currcount = CountLabels(&curr->domain); - bettermatch = BetterMatchForName(&question->qname, namecount, &curr->domain, currcount, bestmatchlen); - // Take the first best match. If there are multiple equally good matches (bettermatch = 0), we take - // the timeout value from the first one - if (bettermatch == 1) - { - curmatch = curr; - bestmatchlen = currcount; - } - } - LogInfo("GetTimeoutForMcastQuestion: question %##s curmatch %p, Timeout %d", question->qname.c, curmatch, - curmatch ? curmatch->timeout : DEFAULT_MCAST_TIMEOUT); - return ( curmatch ? curmatch->timeout : DEFAULT_MCAST_TIMEOUT); - } - -// Returns true if it is a Domain Enumeration Query -mDNSexport mDNSBool DomainEnumQuery(const domainname *qname) - { - const mDNSu8 *mDNS_DEQLabels[] = { (const mDNSu8 *)"\001b", (const mDNSu8 *)"\002db", (const mDNSu8 *)"\002lb", - (const mDNSu8 *)"\001r", (const mDNSu8 *)"\002dr", (const mDNSu8 *)mDNSNULL, }; - const domainname *d = qname; - const mDNSu8 *label; - int i = 0; - - // We need at least 3 labels (DEQ prefix) + one more label to make a meaningful DE query - if (CountLabels(qname) < 4) { debugf("DomainEnumQuery: question %##s, not enough labels", qname->c); return mDNSfalse; } - - label = (const mDNSu8 *)d; - while (mDNS_DEQLabels[i] != (const mDNSu8 *)mDNSNULL) - { - if (SameDomainLabel(mDNS_DEQLabels[i], label)) {debugf("DomainEnumQuery: DEQ %##s, label1 match", qname->c); break;} - i++; - } - if (mDNS_DEQLabels[i] == (const mDNSu8 *)mDNSNULL) - { - debugf("DomainEnumQuery: Not a DEQ %##s, label1 mismatch", qname->c); - return mDNSfalse; - } - debugf("DomainEnumQuery: DEQ %##s, label1 match", qname->c); - - // CountLabels already verified the number of labels - d = (const domainname *)(d->c + 1 + d->c[0]); // Second Label - label = (const mDNSu8 *)d; - if (!SameDomainLabel(label, (const mDNSu8 *)"\007_dns-sd")) - { - debugf("DomainEnumQuery: Not a DEQ %##s, label2 mismatch", qname->c); - return(mDNSfalse); - } - debugf("DomainEnumQuery: DEQ %##s, label2 match", qname->c); - - d = (const domainname *)(d->c + 1 + d->c[0]); // Third Label - label = (const mDNSu8 *)d; - if (!SameDomainLabel(label, (const mDNSu8 *)"\004_udp")) - { - debugf("DomainEnumQuery: Not a DEQ %##s, label3 mismatch", qname->c); - return(mDNSfalse); - } - debugf("DomainEnumQuery: DEQ %##s, label3 match", qname->c); - - debugf("DomainEnumQuery: Question %##s is a Domain Enumeration query", qname->c); - - return mDNStrue; - } - -// Sets all the Valid DNS servers for a question -mDNSexport mDNSu32 SetValidDNSServers(mDNS *m, DNSQuestion *question) - { - DNSServer *curmatch = mDNSNULL; - int bestmatchlen = -1, namecount = CountLabels(&question->qname); - DNSServer *curr; - int bettermatch, currcount; - int index = 0; - mDNSu32 timeout = 0; - mDNSBool DEQuery; - - question->validDNSServers = zeroOpaque64; - DEQuery = DomainEnumQuery(&question->qname); - for (curr = m->DNSServers; curr; curr = curr->next) - { - debugf("SetValidDNSServers: Parsing DNS server Address %#a (Domain %##s), Scope: %d", &curr->addr, curr->domain.c, curr->scoped); - // skip servers that will soon be deleted - if (curr->flags & DNSServer_FlagDelete) - { debugf("SetValidDNSServers: Delete set for index %d, DNS server %#a (Domain %##s), scoped %d", index, &curr->addr, curr->domain.c, curr->scoped); continue; } - - // This happens normally when you unplug the interface where we reset the interfaceID to mDNSInterface_Any for all - // the DNS servers whose scope match the interfaceID. Few seconds later, we also receive the updated DNS configuration. - // But any questions that has mDNSInterface_Any scope that are started/restarted before we receive the update - // (e.g., CheckSuppressUnusableQuestions is called when interfaces are deregistered with the core) should not - // match the scoped entries by mistake. - // - // Note: DNS configuration change will help pick the new dns servers but currently it does not affect the timeout - - if (curr->scoped && curr->interface == mDNSInterface_Any) - { debugf("SetValidDNSServers: Scoped DNS server %#a (Domain %##s) with Interface Any", &curr->addr, curr->domain.c); continue; } - - currcount = CountLabels(&curr->domain); - if ((!DEQuery || !curr->cellIntf) && - ((!curr->scoped && (!question->InterfaceID || (question->InterfaceID == mDNSInterface_Unicast))) || - (curr->interface == question->InterfaceID))) - { - bettermatch = BetterMatchForName(&question->qname, namecount, &curr->domain, currcount, bestmatchlen); - - // If we found a better match (bettermatch == 1) then clear all the bits - // corresponding to the old DNSServers that we have may set before and start fresh. - // If we find an equal match, then include that DNSServer also by setting the corresponding - // bit - if ((bettermatch == 1) || (bettermatch == 0)) - { - curmatch = curr; - bestmatchlen = currcount; - if (bettermatch) { debugf("SetValidDNSServers: Resetting all the bits"); question->validDNSServers = zeroOpaque64; timeout = 0; } - debugf("SetValidDNSServers: question %##s Setting the bit for DNS server Address %#a (Domain %##s), Scoped:%d index %d," - " Timeout %d, interface %p", question->qname.c, &curr->addr, curr->domain.c, curr->scoped, index, curr->timeout, - curr->interface); - timeout += curr->timeout; - if (DEQuery) debugf("DomainEnumQuery: Question %##s, DNSServer %#a, cell %d", question->qname.c, &curr->addr, curr->cellIntf); - bit_set_opaque64(question->validDNSServers, index); - } - } - index++; - } - question->noServerResponse = 0; - - debugf("SetValidDNSServers: ValidDNSServer bits 0x%x%x for question %p %##s (%s)", - question->validDNSServers.l[1], question->validDNSServers.l[0], question, question->qname.c, DNSTypeName(question->qtype)); - // If there are no matching resolvers, then use the default value to timeout - return (timeout ? timeout : DEFAULT_UDNS_TIMEOUT); - } - -// Get the Best server that matches a name. If you find penalized servers, look for the one -// that will come out of the penalty box soon -mDNSlocal DNSServer *GetBestServer(mDNS *m, const domainname *name, mDNSInterfaceID InterfaceID, mDNSOpaque64 validBits, int *selected, mDNSBool nameMatch) - { - DNSServer *curmatch = mDNSNULL; - int bestmatchlen = -1, namecount = name ? CountLabels(name) : 0; - DNSServer *curr; - mDNSs32 bestPenaltyTime, currPenaltyTime; - int bettermatch, currcount; - int index = 0; - int currindex = -1; - - debugf("GetBestServer: ValidDNSServer bits 0x%x%x", validBits.l[1], validBits.l[0]); - bestPenaltyTime = DNSSERVER_PENALTY_TIME + 1; - for (curr = m->DNSServers; curr; curr = curr->next) - { - // skip servers that will soon be deleted - if (curr->flags & DNSServer_FlagDelete) - { debugf("GetBestServer: Delete set for index %d, DNS server %#a (Domain %##s), scoped %d", index, &curr->addr, curr->domain.c, curr->scoped); continue; } - - // Check if this is a valid DNSServer - if (!bit_get_opaque64(validBits, index)) { debugf("GetBestServer: continuing for index %d", index); index++; continue; } - - currcount = CountLabels(&curr->domain); - currPenaltyTime = PenaltyTimeForServer(m, curr); - - debugf("GetBestServer: Address %#a (Domain %##s), PenaltyTime(abs) %d, PenaltyTime(rel) %d", - &curr->addr, curr->domain.c, curr->penaltyTime, currPenaltyTime); - - // If there are multiple best servers for a given question, we will pick the first one - // if none of them are penalized. If some of them are penalized in that list, we pick - // the least penalized one. BetterMatchForName walks through all best matches and - // "currPenaltyTime < bestPenaltyTime" check lets us either pick the first best server - // in the list when there are no penalized servers and least one among them - // when there are some penalized servers - // - // Notes on InterfaceID matching: - // - // 1) A DNSServer entry may have an InterfaceID but the scoped flag may not be set. This - // is the old way of specifying an InterfaceID option for DNSServer. We recoginize these - // entries by "scoped" being false. These are like any other unscoped entries except that - // if it is picked e.g., domain match, when the packet is sent out later, the packet will - // be sent out on that interface. Theese entries can be matched by either specifying a - // zero InterfaceID or non-zero InterfaceID on the question. Specifying an InterfaceID on - // the question will cause an extra check on matching the InterfaceID on the question - // against the DNSServer. - // - // 2) A DNSServer may also have both scoped set and InterfaceID non-NULL. This - // is the new way of specifying an InterfaceID option for DNSServer. These will be considered - // only when the question has non-zero interfaceID. - - if ((!curr->scoped && !InterfaceID) || (curr->interface == InterfaceID)) - { - - // If we know that all the names are already equally good matches, then skip calling BetterMatchForName. - // This happens when we initially walk all the DNS servers and set the validity bit on the question. - // Actually we just need PenaltyTime match, but for the sake of readability we just skip the expensive - // part and still do some redundant steps e.g., InterfaceID match - - if (nameMatch) bettermatch = BetterMatchForName(name, namecount, &curr->domain, currcount, bestmatchlen); - else bettermatch = 0; - - // If we found a better match (bettermatch == 1) then we don't need to - // compare penalty times. But if we found an equal match, then we compare - // the penalty times to pick a better match - - if ((bettermatch == 1) || ((bettermatch == 0) && currPenaltyTime < bestPenaltyTime)) - { currindex = index; curmatch = curr; bestmatchlen = currcount; bestPenaltyTime = currPenaltyTime; } - } - index++; - } - if (selected) *selected = currindex; - return curmatch; - } - -// Look up a DNS Server, matching by name and InterfaceID -mDNSexport DNSServer *GetServerForName(mDNS *m, const domainname *name, mDNSInterfaceID InterfaceID) - { - DNSServer *curmatch = mDNSNULL; - char *ifname = mDNSNULL; // for logging purposes only - mDNSOpaque64 allValid; - - if ((InterfaceID == mDNSInterface_Unicast) || (InterfaceID == mDNSInterface_LocalOnly)) - InterfaceID = mDNSNULL; - - if (InterfaceID) ifname = InterfaceNameForID(m, InterfaceID); - - // By passing in all ones, we make sure that every DNS server is considered - allValid.l[0] = allValid.l[1] = 0xFFFFFFFF; - - curmatch = GetBestServer(m, name, InterfaceID, allValid, mDNSNULL, mDNStrue); - - if (curmatch != mDNSNULL) - LogInfo("GetServerForName: DNS server %#a:%d (Penalty Time Left %d) (Scope %s:%p) found for name %##s", &curmatch->addr, - mDNSVal16(curmatch->port), (curmatch->penaltyTime ? (curmatch->penaltyTime - m->timenow) : 0), ifname ? ifname : "None", - InterfaceID, name); - else - LogInfo("GetServerForName: no DNS server (Scope %s:%p) found for name %##s", ifname ? ifname : "None", InterfaceID, name); - - return(curmatch); - } - -// Look up a DNS Server for a question within its valid DNSServer bits -mDNSexport DNSServer *GetServerForQuestion(mDNS *m, DNSQuestion *question) - { - DNSServer *curmatch = mDNSNULL; - char *ifname = mDNSNULL; // for logging purposes only - mDNSInterfaceID InterfaceID = question->InterfaceID; - const domainname *name = &question->qname; - int currindex; - - if ((InterfaceID == mDNSInterface_Unicast) || (InterfaceID == mDNSInterface_LocalOnly)) - InterfaceID = mDNSNULL; - - if (InterfaceID) ifname = InterfaceNameForID(m, InterfaceID); - - if (!mDNSOpaque64IsZero(&question->validDNSServers)) - { - curmatch = GetBestServer(m, name, InterfaceID, question->validDNSServers, &currindex, mDNSfalse); - if (currindex != -1) bit_clr_opaque64(question->validDNSServers, currindex); - } - - if (curmatch != mDNSNULL) - LogInfo("GetServerForQuestion: %p DNS server %#a:%d (Penalty Time Left %d) (Scope %s:%p) found for name %##s (%s)", question, &curmatch->addr, - mDNSVal16(curmatch->port), (curmatch->penaltyTime ? (curmatch->penaltyTime - m->timenow) : 0), ifname ? ifname : "None", - InterfaceID, name, DNSTypeName(question->qtype)); - else - LogInfo("GetServerForQuestion: %p no DNS server (Scope %s:%p) found for name %##s (%s)", question, ifname ? ifname : "None", InterfaceID, name, DNSTypeName(question->qtype)); - - return(curmatch); - } - - -#define ValidQuestionTarget(Q) (((Q)->Target.type == mDNSAddrType_IPv4 || (Q)->Target.type == mDNSAddrType_IPv6) && \ - (mDNSSameIPPort((Q)->TargetPort, UnicastDNSPort) || mDNSSameIPPort((Q)->TargetPort, MulticastDNSPort))) - -// Called in normal client context (lock not held) -mDNSlocal void LLQNATCallback(mDNS *m, NATTraversalInfo *n) - { - DNSQuestion *q; - (void)n; // Unused - mDNS_Lock(m); - LogInfo("LLQNATCallback external address:port %.4a:%u, NAT result %d", &n->ExternalAddress, mDNSVal16(n->ExternalPort), n->Result); - for (q = m->Questions; q; q=q->next) - if (ActiveQuestion(q) && !mDNSOpaque16IsZero(q->TargetQID) && q->LongLived) - startLLQHandshake(m, q); // If ExternalPort is zero, will do StartLLQPolling instead -#if APPLE_OSX_mDNSResponder - UpdateAutoTunnelDomainStatuses(m); -#endif - mDNS_Unlock(m); - } - -mDNSlocal mDNSBool ShouldSuppressQuery(mDNS *const m, domainname *qname, mDNSu16 qtype, mDNSInterfaceID InterfaceID) - { - NetworkInterfaceInfo *i; - mDNSs32 iptype; - DomainAuthInfo *AuthInfo; - - if (qtype == kDNSType_A) iptype = mDNSAddrType_IPv4; - else if (qtype == kDNSType_AAAA) iptype = mDNSAddrType_IPv6; - else { LogInfo("ShouldSuppressQuery: Query not suppressed for %##s, qtype %s, not A/AAAA type", qname, DNSTypeName(qtype)); return mDNSfalse; } - - // We still want the ability to be able to listen to the local services and hence - // don't fail .local requests. We always have a loopback interface which we don't - // check here. - if (InterfaceID != mDNSInterface_Unicast && IsLocalDomain(qname)) { LogInfo("ShouldSuppressQuery: Query not suppressed for %##s, qtype %s, Local question", qname, DNSTypeName(qtype)); return mDNSfalse; } - - // Skip Private domains as we have special addresses to get the hosts in the Private domain - AuthInfo = GetAuthInfoForName_internal(m, qname); - if (AuthInfo && !AuthInfo->deltime && AuthInfo->AutoTunnel) - { LogInfo("ShouldSuppressQuery: Query not suppressed for %##s, qtype %s, Private Domain", qname, DNSTypeName(qtype)); return mDNSfalse; } - - // Match on Type, Address and InterfaceID - // - // Check whether we are looking for a name that ends in .local, then presence of a link-local - // address on the interface is sufficient. - for (i = m->HostInterfaces; i; i = i->next) - { - if (i->ip.type != iptype) continue; - - if (!InterfaceID || (InterfaceID == mDNSInterface_LocalOnly) || (InterfaceID == mDNSInterface_P2P) || - (InterfaceID == mDNSInterface_Unicast) || (i->InterfaceID == InterfaceID)) - { - if (iptype == mDNSAddrType_IPv4 && !mDNSv4AddressIsLoopback(&i->ip.ip.v4) && !mDNSv4AddressIsLinkLocal(&i->ip.ip.v4)) - { - LogInfo("ShouldSuppressQuery: Query not suppressed for %##s, qtype %s, Local Address %.4a found", qname, DNSTypeName(qtype), - &i->ip.ip.v4); - return mDNSfalse; - } - else if (iptype == mDNSAddrType_IPv6 && - !mDNSv6AddressIsLoopback(&i->ip.ip.v6) && - !mDNSv6AddressIsLinkLocal(&i->ip.ip.v6) && - !mDNSSameIPv6Address(i->ip.ip.v6, m->AutoTunnelHostAddr) && - !mDNSSameIPv6Address(i->ip.ip.v6, m->AutoTunnelRelayAddrOut)) - { - LogInfo("ShouldSuppressQuery: Query not suppressed for %##s, qtype %s, Local Address %.16a found", qname, DNSTypeName(qtype), - &i->ip.ip.v6); - return mDNSfalse; - } - } - } - LogInfo("ShouldSuppressQuery: Query suppressed for %##s, qtype %s, because no matching interface found", qname, DNSTypeName(qtype)); - return mDNStrue; - } - -mDNSlocal void CacheRecordRmvEventsForCurrentQuestion(mDNS *const m, DNSQuestion *q) - { - CacheRecord *rr; - mDNSu32 slot; - CacheGroup *cg; - - slot = HashSlot(&q->qname); - cg = CacheGroupForName(m, slot, q->qnamehash, &q->qname); - for (rr = cg ? cg->members : mDNSNULL; rr; rr=rr->next) - { - // Don't deliver RMV events for negative records - if (rr->resrec.RecordType == kDNSRecordTypePacketNegative) - { - LogInfo("CacheRecordRmvEventsForCurrentQuestion: CacheRecord %s Suppressing RMV events for question %p %##s (%s), CRActiveQuestion %p, CurrentAnswers %d", - CRDisplayString(m, rr), q, q->qname.c, DNSTypeName(q->qtype), rr->CRActiveQuestion, q->CurrentAnswers); - continue; - } - - if (SameNameRecordAnswersQuestion(&rr->resrec, q)) - { - LogInfo("CacheRecordRmvEventsForCurrentQuestion: Calling AnswerCurrentQuestionWithResourceRecord (RMV) for question %##s using resource record %s LocalAnswers %d", - q->qname.c, CRDisplayString(m, rr), q->LOAddressAnswers); - - q->CurrentAnswers--; - if (rr->resrec.rdlength > SmallRecordLimit) q->LargeAnswers--; - if (rr->resrec.RecordType & kDNSRecordTypePacketUniqueMask) q->UniqueAnswers--; - - if (rr->CRActiveQuestion == q) - { - DNSQuestion *qptr; - // If this was the active question for this cache entry, it was the one that was - // responsible for keeping the cache entry fresh when the cache entry was reaching - // its expiry. We need to handover the responsibility to someone else. Otherwise, - // when the cache entry is about to expire, we won't find an active question - // (pointed by CRActiveQuestion) to refresh the cache. - for (qptr = m->Questions; qptr; qptr=qptr->next) - if (qptr != q && ActiveQuestion(qptr) && ResourceRecordAnswersQuestion(&rr->resrec, qptr)) - break; - - if (qptr) - LogInfo("CacheRecordRmvEventsForCurrentQuestion: Updating CRActiveQuestion to %p for cache record %s, " - "Original question CurrentAnswers %d, new question CurrentAnswers %d, SuppressUnusable %d, SuppressQuery %d", - qptr, CRDisplayString(m,rr), q->CurrentAnswers, qptr->CurrentAnswers, qptr->SuppressUnusable, qptr->SuppressQuery); - - rr->CRActiveQuestion = qptr; // Question used to be active; new value may or may not be null - if (!qptr) m->rrcache_active--; // If no longer active, decrement rrcache_active count - } - AnswerCurrentQuestionWithResourceRecord(m, rr, QC_rmv); - if (m->CurrentQuestion != q) break; // If callback deleted q, then we're finished here - } - } - } - -mDNSlocal mDNSBool IsQuestionNew(mDNS *const m, DNSQuestion *question) - { - DNSQuestion *q; - for (q = m->NewQuestions; q; q = q->next) - if (q == question) return mDNStrue; - return mDNSfalse; - } - -mDNSlocal mDNSBool LocalRecordRmvEventsForQuestion(mDNS *const m, DNSQuestion *q) - { - AuthRecord *rr; - mDNSu32 slot; - AuthGroup *ag; - - if (m->CurrentQuestion) - LogMsg("LocalRecordRmvEventsForQuestion: ERROR m->CurrentQuestion already set: %##s (%s)", - m->CurrentQuestion->qname.c, DNSTypeName(m->CurrentQuestion->qtype)); - - if (IsQuestionNew(m, q)) - { - LogInfo("LocalRecordRmvEventsForQuestion: New Question %##s (%s)", q->qname.c, DNSTypeName(q->qtype)); - return mDNStrue; - } - m->CurrentQuestion = q; - slot = AuthHashSlot(&q->qname); - ag = AuthGroupForName(&m->rrauth, slot, q->qnamehash, &q->qname); - if (ag) - { - for (rr = ag->members; rr; rr=rr->next) - // Filter the /etc/hosts records - LocalOnly, Unique, A/AAAA/CNAME - if (LORecordAnswersAddressType(rr) && LocalOnlyRecordAnswersQuestion(rr, q)) - { - LogInfo("LocalRecordRmvEventsForQuestion: Delivering possible Rmv events with record %s", - ARDisplayString(m, rr)); - if (q->CurrentAnswers <= 0 || q->LOAddressAnswers <= 0) - { - LogMsg("LocalRecordRmvEventsForQuestion: ERROR!! CurrentAnswers or LOAddressAnswers is zero %p %##s" - " (%s) CurrentAnswers %d, LOAddressAnswers %d", q, q->qname.c, DNSTypeName(q->qtype), - q->CurrentAnswers, q->LOAddressAnswers); - continue; - } - AnswerLocalQuestionWithLocalAuthRecord(m, rr, QC_rmv); // MUST NOT dereference q again - if (m->CurrentQuestion != q) { m->CurrentQuestion = mDNSNULL; return mDNSfalse; } - } - } - m->CurrentQuestion = mDNSNULL; - return mDNStrue; - } - -// Returns false if the question got deleted while delivering the RMV events -// The caller should handle the case -mDNSlocal mDNSBool CacheRecordRmvEventsForQuestion(mDNS *const m, DNSQuestion *q) - { - if (m->CurrentQuestion) - LogMsg("CacheRecordRmvEventsForQuestion: ERROR m->CurrentQuestion already set: %##s (%s)", - m->CurrentQuestion->qname.c, DNSTypeName(m->CurrentQuestion->qtype)); - - // If it is a new question, we have not delivered any ADD events yet. So, don't deliver RMV events. - // If this question was answered using local auth records, then you can't deliver RMVs using cache - if (!IsQuestionNew(m, q) && !q->LOAddressAnswers) - { - m->CurrentQuestion = q; - CacheRecordRmvEventsForCurrentQuestion(m, q); - if (m->CurrentQuestion != q) { m->CurrentQuestion = mDNSNULL; return mDNSfalse; } - m->CurrentQuestion = mDNSNULL; - } - else { LogInfo("CacheRecordRmvEventsForQuestion: Question %p %##s (%s) is a new question", q, q->qname.c, DNSTypeName(q->qtype)); } - return mDNStrue; - } - -// The caller should hold the lock -mDNSexport void CheckSuppressUnusableQuestions(mDNS *const m) - { - DNSQuestion *q; - DNSQuestion *restart = mDNSNULL; - - // We look through all questions including new questions. During network change events, - // we potentially restart questions here in this function that ends up as new questions, - // which may be suppressed at this instance. Before it is handled we get another network - // event that changes the status e.g., address becomes available. If we did not process - // new questions, we would never change its SuppressQuery status. - // - // CurrentQuestion is used by RmvEventsForQuestion below. While delivering RMV events, the - // application callback can potentially stop the current question (detected by CurrentQuestion) or - // *any* other question which could be the next one that we may process here. RestartQuestion - // points to the "next" question which will be automatically advanced in mDNS_StopQuery_internal - // if the "next" question is stopped while the CurrentQuestion is stopped - if (m->RestartQuestion) - LogMsg("CheckSuppressUnusableQuestions: ERROR!! m->RestartQuestion already set: %##s (%s)", - m->RestartQuestion->qname.c, DNSTypeName(m->RestartQuestion->qtype)); - m->RestartQuestion = m->Questions; - while (m->RestartQuestion) - { - q = m->RestartQuestion; - m->RestartQuestion = q->next; - if (!mDNSOpaque16IsZero(q->TargetQID) && q->SuppressUnusable) - { - mDNSBool old = q->SuppressQuery; - q->SuppressQuery = ShouldSuppressQuery(m, &q->qname, q->qtype, q->InterfaceID); - if (q->SuppressQuery != old) - { - // NOTE: CacheRecordRmvEventsForQuestion will not generate RMV events for queries that have non-zero - // LOddressAnswers. Hence it is important that we call CacheRecordRmvEventsForQuestion before - // LocalRecordRmvEventsForQuestion (which decrements LOAddressAnswers) - - if (q->SuppressQuery) - { - // Previously it was not suppressed, Generate RMV events for the ADDs that we might have delivered before - // followed by a negative cache response. Temporarily turn off suppression so that - // AnswerCurrentQuestionWithResourceRecord can answer the question - q->SuppressQuery = mDNSfalse; - if (!CacheRecordRmvEventsForQuestion(m, q)) { LogInfo("CheckSuppressUnusableQuestions: Question deleted while delivering RMV events"); continue; } - q->SuppressQuery = mDNStrue; - } - - // SuppressUnusable does not affect questions that are answered from the local records (/etc/hosts) - // and SuppressQuery status does not mean anything for these questions. As we are going to stop the - // question below, we need to deliver the RMV events so that the ADDs that will be delivered during - // the restart will not be a duplicate ADD - if (!LocalRecordRmvEventsForQuestion(m, q)) { LogInfo("CheckSuppressUnusableQuestions: Question deleted while delivering RMV events"); continue; } - - // There are two cases here. - // - // 1. Previously it was suppressed and now it is not suppressed, restart the question so - // that it will start as a new question. Note that we can't just call ActivateUnicastQuery - // because when we get the response, if we had entries in the cache already, it will not answer - // this question if the cache entry did not change. Hence, we need to restart - // the query so that it can be answered from the cache. - // - // 2. Previously it was not suppressed and now it is suppressed. We need to restart the questions - // so that we redo the duplicate checks in mDNS_StartQuery_internal. A SuppressUnusable question - // is a duplicate of non-SuppressUnusable question if it is not suppressed (SuppressQuery is false). - // A SuppressUnusable question is not a duplicate of non-SuppressUnusable question if it is suppressed - // (SuppressQuery is true). The reason for this is that when a question is suppressed, we want an - // immediate response and not want to be blocked behind a question that is querying DNS servers. When - // the question is not suppressed, we don't want two active questions sending packets on the wire. - // This affects both efficiency and also the current design where there is only one active question - // pointed to from a cache entry. - // - // We restart queries in a two step process by first calling stop and build a temporary list which we - // will restart at the end. The main reason for the two step process is to handle duplicate questions. - // If there are duplicate questions, calling stop inherits the values from another question on the list (which - // will soon become the real question) including q->ThisQInterval which might be zero if it was - // suppressed before. At the end when we have restarted all questions, none of them is active as each - // inherits from one another and we need to reactivate one of the questions here which is a little hacky. - // - // It is much cleaner and less error prone to build a list of questions and restart at the end. - - LogInfo("CheckSuppressUnusableQuestions: Stop question %p %##s (%s)", q, q->qname.c, DNSTypeName(q->qtype)); - mDNS_StopQuery_internal(m, q); - q->next = restart; - restart = q; - } - } - } - while (restart) - { - q = restart; - restart = restart->next; - q->next = mDNSNULL; - LogInfo("CheckSuppressUnusableQuestions: Start question %p %##s (%s)", q, q->qname.c, DNSTypeName(q->qtype)); - mDNS_StartQuery_internal(m, q); - } - } - -mDNSexport mStatus mDNS_StartQuery_internal(mDNS *const m, DNSQuestion *const question) - { - if (question->Target.type && !ValidQuestionTarget(question)) - { - LogMsg("mDNS_StartQuery_internal: Warning! Target.type = %ld port = %u (Client forgot to initialize before calling mDNS_StartQuery? for question %##s)", - question->Target.type, mDNSVal16(question->TargetPort), question->qname.c); - question->Target.type = mDNSAddrType_None; - } - - if (!question->Target.type) question->TargetPort = zeroIPPort; // If no question->Target specified clear TargetPort - - question->TargetQID = -#ifndef UNICAST_DISABLED - (question->Target.type || Question_uDNS(question)) ? mDNS_NewMessageID(m) : -#endif // UNICAST_DISABLED - zeroID; - - debugf("mDNS_StartQuery: %##s (%s)", question->qname.c, DNSTypeName(question->qtype)); - - if (m->rrcache_size == 0) // Can't do queries if we have no cache space allocated - return(mStatus_NoCache); - else - { - int i; - DNSQuestion **q; - - if (!ValidateDomainName(&question->qname)) - { - LogMsg("Attempt to start query with invalid qname %##s (%s)", question->qname.c, DNSTypeName(question->qtype)); - return(mStatus_Invalid); - } - - // Note: It important that new questions are appended at the *end* of the list, not prepended at the start - q = &m->Questions; - if (question->InterfaceID == mDNSInterface_LocalOnly || question->InterfaceID == mDNSInterface_P2P) q = &m->LocalOnlyQuestions; - while (*q && *q != question) q=&(*q)->next; - - if (*q) - { - LogMsg("Error! Tried to add a question %##s (%s) %p that's already in the active list", - question->qname.c, DNSTypeName(question->qtype), question); - return(mStatus_AlreadyRegistered); - } - - *q = question; - - // If this question is referencing a specific interface, verify it exists - if (question->InterfaceID && question->InterfaceID != mDNSInterface_LocalOnly && question->InterfaceID != mDNSInterface_Unicast && question->InterfaceID != mDNSInterface_P2P) - { - NetworkInterfaceInfo *intf = FirstInterfaceForID(m, question->InterfaceID); - if (!intf) - LogMsg("Note: InterfaceID %p for question %##s (%s) not currently found in active interface list", - question->InterfaceID, question->qname.c, DNSTypeName(question->qtype)); - } - - // Note: In the case where we already have the answer to this question in our cache, that may be all the client - // wanted, and they may immediately cancel their question. In this case, sending an actual query on the wire would - // be a waste. For that reason, we schedule our first query to go out in half a second (InitialQuestionInterval). - // If AnswerNewQuestion() finds that we have *no* relevant answers currently in our cache, then it will accelerate - // that to go out immediately. - question->next = mDNSNULL; - question->qnamehash = DomainNameHashValue(&question->qname); // MUST do this before FindDuplicateQuestion() - question->DelayAnswering = CheckForSoonToExpireRecords(m, &question->qname, question->qnamehash, HashSlot(&question->qname)); - question->LastQTime = m->timenow; - question->ThisQInterval = InitialQuestionInterval; // MUST be > zero for an active question - question->ExpectUnicastResp = 0; - question->LastAnswerPktNum = m->PktNum; - question->RecentAnswerPkts = 0; - question->CurrentAnswers = 0; - question->LargeAnswers = 0; - question->UniqueAnswers = 0; - question->LOAddressAnswers = 0; - question->FlappingInterface1 = mDNSNULL; - question->FlappingInterface2 = mDNSNULL; - // Must do AuthInfo and SuppressQuery before calling FindDuplicateQuestion() - question->AuthInfo = GetAuthInfoForQuestion(m, question); - if (question->SuppressUnusable) - question->SuppressQuery = ShouldSuppressQuery(m, &question->qname, question->qtype, question->InterfaceID); - else - question->SuppressQuery = 0; - question->DuplicateOf = FindDuplicateQuestion(m, question); - question->NextInDQList = mDNSNULL; - question->SendQNow = mDNSNULL; - question->SendOnAll = mDNSfalse; - question->RequestUnicast = 0; - question->LastQTxTime = m->timenow; - question->CNAMEReferrals = 0; - - // We'll create our question->LocalSocket on demand, if needed. - // We won't need one for duplicate questions, or from questions answered immediately out of the cache. - // We also don't need one for LLQs because (when we're using NAT) we want them all to share a single - // NAT mapping for receiving inbound add/remove events. - question->LocalSocket = mDNSNULL; - question->deliverAddEvents = mDNSfalse; - question->qDNSServer = mDNSNULL; - question->unansweredQueries = 0; - question->nta = mDNSNULL; - question->servAddr = zeroAddr; - question->servPort = zeroIPPort; - question->tcp = mDNSNULL; - question->NoAnswer = NoAnswer_Normal; - - question->state = LLQ_InitialRequest; - question->ReqLease = 0; - question->expire = 0; - question->ntries = 0; - question->id = zeroOpaque64; - question->validDNSServers = zeroOpaque64; - question->triedAllServersOnce = 0; - question->noServerResponse = 0; - question->StopTime = 0; - if (question->WakeOnResolve) - { - question->WakeOnResolveCount = InitialWakeOnResolveCount; - mDNS_PurgeBeforeResolve(m, question); - } - else - question->WakeOnResolveCount = 0; - - if (question->DuplicateOf) question->AuthInfo = question->DuplicateOf->AuthInfo; - - for (i=0; iDupSuppress[i].InterfaceID = mDNSNULL; - - debugf("mDNS_StartQuery: Question %##s (%s) Interface %p Now %d Send in %d Answer in %d (%p) %s (%p)", - question->qname.c, DNSTypeName(question->qtype), question->InterfaceID, m->timenow, - NextQSendTime(question) - m->timenow, - question->DelayAnswering ? question->DelayAnswering - m->timenow : 0, - question, question->DuplicateOf ? "duplicate of" : "not duplicate", question->DuplicateOf); - - if (question->DelayAnswering) - LogInfo("mDNS_StartQuery_internal: Delaying answering for %d ticks while cache stabilizes for %##s (%s)", - question->DelayAnswering - m->timenow, question->qname.c, DNSTypeName(question->qtype)); - - if (question->InterfaceID == mDNSInterface_LocalOnly || question->InterfaceID == mDNSInterface_P2P) - { - if (!m->NewLocalOnlyQuestions) m->NewLocalOnlyQuestions = question; - } - else - { - if (!m->NewQuestions) m->NewQuestions = question; - - // If the question's id is non-zero, then it's Wide Area - // MUST NOT do this Wide Area setup until near the end of - // mDNS_StartQuery_internal -- this code may itself issue queries (e.g. SOA, - // NS, etc.) and if we haven't finished setting up our own question and setting - // m->NewQuestions if necessary then we could end up recursively re-entering - // this routine with the question list data structures in an inconsistent state. - if (!mDNSOpaque16IsZero(question->TargetQID)) - { - // Duplicate questions should have the same DNSServers so that when we find - // a matching resource record, all of them get the answers. Calling GetServerForQuestion - // for the duplicate question may get a different DNS server from the original question - mDNSu32 timeout = SetValidDNSServers(m, question); - // We set the timeout whenever mDNS_StartQuery_internal is called. This means if we have - // a networking change/search domain change that calls this function again we keep - // reinitializing the timeout value which means it may never timeout. If this becomes - // a common case in the future, we can easily fix this by adding extra state that - // indicates that we have already set the StopTime. - if (question->TimeoutQuestion) - question->StopTime = NonZeroTime(m->timenow + timeout * mDNSPlatformOneSecond); - if (question->DuplicateOf) - { - question->validDNSServers = question->DuplicateOf->validDNSServers; - question->qDNSServer = question->DuplicateOf->qDNSServer; - LogInfo("mDNS_StartQuery_internal: Duplicate question %p (%p) %##s (%s), Timeout %d, DNS Server %#a:%d", - question, question->DuplicateOf, question->qname.c, DNSTypeName(question->qtype), timeout, - question->qDNSServer ? &question->qDNSServer->addr : mDNSNULL, - mDNSVal16(question->qDNSServer ? question->qDNSServer->port : zeroIPPort)); - } - else - { - question->qDNSServer = GetServerForQuestion(m, question); - LogInfo("mDNS_StartQuery_internal: question %p %##s (%s) Timeout %d, DNS Server %#a:%d", - question, question->qname.c, DNSTypeName(question->qtype), timeout, - question->qDNSServer ? &question->qDNSServer->addr : mDNSNULL, - mDNSVal16(question->qDNSServer ? question->qDNSServer->port : zeroIPPort)); - } - ActivateUnicastQuery(m, question, mDNSfalse); - - // If long-lived query, and we don't have our NAT mapping active, start it now - if (question->LongLived && !m->LLQNAT.clientContext) - { - m->LLQNAT.Protocol = NATOp_MapUDP; - m->LLQNAT.IntPort = m->UnicastPort4; - m->LLQNAT.RequestedPort = m->UnicastPort4; - m->LLQNAT.clientCallback = LLQNATCallback; - m->LLQNAT.clientContext = (void*)1; // Means LLQ NAT Traversal is active - mDNS_StartNATOperation_internal(m, &m->LLQNAT); - } - -#if APPLE_OSX_mDNSResponder - if (question->LongLived) - UpdateAutoTunnelDomainStatuses(m); -#endif - - } - else - { - if (question->TimeoutQuestion) - question->StopTime = NonZeroTime(m->timenow + GetTimeoutForMcastQuestion(m, question) * mDNSPlatformOneSecond); - } - if (question->StopTime) SetNextQueryStopTime(m, question); - SetNextQueryTime(m,question); - } - - return(mStatus_NoError); - } - } - -// CancelGetZoneData is an internal routine (i.e. must be called with the lock already held) -mDNSexport void CancelGetZoneData(mDNS *const m, ZoneData *nta) - { - debugf("CancelGetZoneData %##s (%s)", nta->question.qname.c, DNSTypeName(nta->question.qtype)); - // This function may be called anytime to free the zone information.The question may or may not have stopped. - // If it was already stopped, mDNS_StopQuery_internal would have set q->ThisQInterval to -1 and should not - // call it again - if (nta->question.ThisQInterval != -1) - { - mDNS_StopQuery_internal(m, &nta->question); - if (nta->question.ThisQInterval != -1) - LogMsg("CancelGetZoneData: Question %##s (%s) ThisQInterval %d not -1", nta->question.qname.c, DNSTypeName(nta->question.qtype), nta->question.ThisQInterval); - } - mDNSPlatformMemFree(nta); - } - -mDNSexport mStatus mDNS_StopQuery_internal(mDNS *const m, DNSQuestion *const question) - { - const mDNSu32 slot = HashSlot(&question->qname); - CacheGroup *cg = CacheGroupForName(m, slot, question->qnamehash, &question->qname); - CacheRecord *rr; - DNSQuestion **qp = &m->Questions; - - //LogInfo("mDNS_StopQuery_internal %##s (%s)", question->qname.c, DNSTypeName(question->qtype)); - - if (question->InterfaceID == mDNSInterface_LocalOnly || question->InterfaceID == mDNSInterface_P2P) qp = &m->LocalOnlyQuestions; - while (*qp && *qp != question) qp=&(*qp)->next; - if (*qp) *qp = (*qp)->next; - else - { -#if !ForceAlerts - if (question->ThisQInterval >= 0) // Only log error message if the query was supposed to be active -#endif - LogMsg("mDNS_StopQuery_internal: Question %##s (%s) not found in active list", - question->qname.c, DNSTypeName(question->qtype)); -#if ForceAlerts - *(long*)0 = 0; -#endif - return(mStatus_BadReferenceErr); - } - - // Take care to cut question from list *before* calling UpdateQuestionDuplicates - UpdateQuestionDuplicates(m, question); - // But don't trash ThisQInterval until afterwards. - question->ThisQInterval = -1; - - // If there are any cache records referencing this as their active question, then see if there is any - // other question that is also referencing them, else their CRActiveQuestion needs to get set to NULL. - for (rr = cg ? cg->members : mDNSNULL; rr; rr=rr->next) - { - if (rr->CRActiveQuestion == question) - { - DNSQuestion *q; - // Checking for ActiveQuestion filters questions that are suppressed also - // as suppressed questions are not active - for (q = m->Questions; q; q=q->next) // Scan our list of questions - if (ActiveQuestion(q) && ResourceRecordAnswersQuestion(&rr->resrec, q)) - break; - if (q) - debugf("mDNS_StopQuery_internal: Updating CRActiveQuestion to %p for cache record %s, Original question CurrentAnswers %d, new question " - "CurrentAnswers %d, SuppressQuery %d", q, CRDisplayString(m,rr), question->CurrentAnswers, q->CurrentAnswers, q->SuppressQuery); - rr->CRActiveQuestion = q; // Question used to be active; new value may or may not be null - if (!q) m->rrcache_active--; // If no longer active, decrement rrcache_active count - } - } - - // If we just deleted the question that CacheRecordAdd() or CacheRecordRmv() is about to look at, - // bump its pointer forward one question. - if (m->CurrentQuestion == question) - { - debugf("mDNS_StopQuery_internal: Just deleted the currently active question: %##s (%s)", - question->qname.c, DNSTypeName(question->qtype)); - m->CurrentQuestion = question->next; - } - - if (m->NewQuestions == question) - { - debugf("mDNS_StopQuery_internal: Just deleted a new question that wasn't even answered yet: %##s (%s)", - question->qname.c, DNSTypeName(question->qtype)); - m->NewQuestions = question->next; - } - - if (m->NewLocalOnlyQuestions == question) m->NewLocalOnlyQuestions = question->next; - - if (m->RestartQuestion == question) - { - LogMsg("mDNS_StopQuery_internal: Just deleted the current restart question: %##s (%s)", - question->qname.c, DNSTypeName(question->qtype)); - m->RestartQuestion = question->next; - } - - // Take care not to trash question->next until *after* we've updated m->CurrentQuestion and m->NewQuestions - question->next = mDNSNULL; - - // LogMsg("mDNS_StopQuery_internal: Question %##s (%s) removed", question->qname.c, DNSTypeName(question->qtype)); - - // And finally, cancel any associated GetZoneData operation that's still running. - // Must not do this until last, because there's a good chance the GetZoneData question is the next in the list, - // so if we delete it earlier in this routine, we could find that our "question->next" pointer above is already - // invalid before we even use it. By making sure that we update m->CurrentQuestion and m->NewQuestions if necessary - // *first*, then they're all ready to be updated a second time if necessary when we cancel our GetZoneData query. - if (question->tcp) { DisposeTCPConn(question->tcp); question->tcp = mDNSNULL; } - if (question->LocalSocket) { mDNSPlatformUDPClose(question->LocalSocket); question->LocalSocket = mDNSNULL; } - if (!mDNSOpaque16IsZero(question->TargetQID) && question->LongLived) - { - // Scan our list to see if any more wide-area LLQs remain. If not, stop our NAT Traversal. - DNSQuestion *q; - for (q = m->Questions; q; q=q->next) - if (!mDNSOpaque16IsZero(q->TargetQID) && q->LongLived) break; - if (!q) - { - if (!m->LLQNAT.clientContext) // Should never happen, but just in case... - LogMsg("mDNS_StopQuery ERROR LLQNAT.clientContext NULL"); - else - { - LogInfo("Stopping LLQNAT"); - mDNS_StopNATOperation_internal(m, &m->LLQNAT); - m->LLQNAT.clientContext = mDNSNULL; // Means LLQ NAT Traversal not running - } - } - - // If necessary, tell server it can delete this LLQ state - if (question->state == LLQ_Established) - { - question->ReqLease = 0; - sendLLQRefresh(m, question); - // If we need need to make a TCP connection to cancel the LLQ, that's going to take a little while. - // We clear the tcp->question backpointer so that when the TCP connection completes, it doesn't - // crash trying to access our cancelled question, but we don't cancel the TCP operation itself -- - // we let that run out its natural course and complete asynchronously. - if (question->tcp) - { - question->tcp->question = mDNSNULL; - question->tcp = mDNSNULL; - } - } -#if APPLE_OSX_mDNSResponder - UpdateAutoTunnelDomainStatuses(m); -#endif - } - // wait until we send the refresh above which needs the nta - if (question->nta) { CancelGetZoneData(m, question->nta); question->nta = mDNSNULL; } - - return(mStatus_NoError); - } - -mDNSexport mStatus mDNS_StartQuery(mDNS *const m, DNSQuestion *const question) - { - mStatus status; - mDNS_Lock(m); - status = mDNS_StartQuery_internal(m, question); - mDNS_Unlock(m); - return(status); - } - -mDNSexport mStatus mDNS_StopQuery(mDNS *const m, DNSQuestion *const question) - { - mStatus status; - mDNS_Lock(m); - status = mDNS_StopQuery_internal(m, question); - mDNS_Unlock(m); - return(status); - } - -// Note that mDNS_StopQueryWithRemoves() does not currently implement the full generality of the other APIs -// Specifically, question callbacks invoked as a result of this call cannot themselves make API calls. -// We invoke the callback without using mDNS_DropLockBeforeCallback/mDNS_ReclaimLockAfterCallback -// specifically to catch and report if the client callback does try to make API calls -mDNSexport mStatus mDNS_StopQueryWithRemoves(mDNS *const m, DNSQuestion *const question) - { - mStatus status; - DNSQuestion *qq; - mDNS_Lock(m); - - // Check if question is new -- don't want to give remove events for a question we haven't even answered yet - for (qq = m->NewQuestions; qq; qq=qq->next) if (qq == question) break; - - status = mDNS_StopQuery_internal(m, question); - if (status == mStatus_NoError && !qq) - { - const CacheRecord *rr; - const mDNSu32 slot = HashSlot(&question->qname); - CacheGroup *const cg = CacheGroupForName(m, slot, question->qnamehash, &question->qname); - LogInfo("Generating terminal removes for %##s (%s)", question->qname.c, DNSTypeName(question->qtype)); - for (rr = cg ? cg->members : mDNSNULL; rr; rr=rr->next) - if (rr->resrec.RecordType != kDNSRecordTypePacketNegative && SameNameRecordAnswersQuestion(&rr->resrec, question)) - { - // Don't use mDNS_DropLockBeforeCallback() here, since we don't allow API calls - if (question->QuestionCallback) - question->QuestionCallback(m, question, &rr->resrec, mDNSfalse); - } - } - mDNS_Unlock(m); - return(status); - } - -mDNSexport mStatus mDNS_Reconfirm(mDNS *const m, CacheRecord *const cr) - { - mStatus status; - mDNS_Lock(m); - status = mDNS_Reconfirm_internal(m, cr, kDefaultReconfirmTimeForNoAnswer); - if (status == mStatus_NoError) ReconfirmAntecedents(m, cr->resrec.name, cr->resrec.namehash, 0); - mDNS_Unlock(m); - return(status); - } - -mDNSexport mStatus mDNS_ReconfirmByValue(mDNS *const m, ResourceRecord *const rr) - { - mStatus status = mStatus_BadReferenceErr; - CacheRecord *cr; - mDNS_Lock(m); - cr = FindIdenticalRecordInCache(m, rr); - debugf("mDNS_ReconfirmByValue: %p %s", cr, RRDisplayString(m, rr)); - if (cr) status = mDNS_Reconfirm_internal(m, cr, kDefaultReconfirmTimeForNoAnswer); - if (status == mStatus_NoError) ReconfirmAntecedents(m, cr->resrec.name, cr->resrec.namehash, 0); - mDNS_Unlock(m); - return(status); - } - -mDNSlocal mStatus mDNS_StartBrowse_internal(mDNS *const m, DNSQuestion *const question, - const domainname *const srv, const domainname *const domain, - const mDNSInterfaceID InterfaceID, mDNSBool ForceMCast, mDNSQuestionCallback *Callback, void *Context) - { - question->InterfaceID = InterfaceID; - question->Target = zeroAddr; - question->qtype = kDNSType_PTR; - question->qclass = kDNSClass_IN; - question->LongLived = mDNStrue; - question->ExpectUnique = mDNSfalse; - question->ForceMCast = ForceMCast; - question->ReturnIntermed = mDNSfalse; - question->SuppressUnusable = mDNSfalse; - question->SearchListIndex = 0; - question->AppendSearchDomains = 0; - question->RetryWithSearchDomains = mDNSfalse; - question->TimeoutQuestion = 0; - question->WakeOnResolve = 0; - question->qnameOrig = mDNSNULL; - question->QuestionCallback = Callback; - question->QuestionContext = Context; - if (!ConstructServiceName(&question->qname, mDNSNULL, srv, domain)) return(mStatus_BadParamErr); - - return(mDNS_StartQuery_internal(m, question)); - } - -mDNSexport mStatus mDNS_StartBrowse(mDNS *const m, DNSQuestion *const question, - const domainname *const srv, const domainname *const domain, - const mDNSInterfaceID InterfaceID, mDNSBool ForceMCast, mDNSQuestionCallback *Callback, void *Context) - { - mStatus status; - mDNS_Lock(m); - status = mDNS_StartBrowse_internal(m, question, srv, domain, InterfaceID, ForceMCast, Callback, Context); - mDNS_Unlock(m); - return(status); - } - -mDNSlocal mDNSBool MachineHasActiveIPv6(mDNS *const m) - { - NetworkInterfaceInfo *intf; - for (intf = m->HostInterfaces; intf; intf = intf->next) - if (intf->ip.type == mDNSAddrType_IPv6) return(mDNStrue); - return(mDNSfalse); - } - -mDNSlocal void FoundServiceInfoSRV(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, QC_result AddRecord) - { - ServiceInfoQuery *query = (ServiceInfoQuery *)question->QuestionContext; - mDNSBool PortChanged = !mDNSSameIPPort(query->info->port, answer->rdata->u.srv.port); - if (!AddRecord) return; - if (answer->rrtype != kDNSType_SRV) return; - - query->info->port = answer->rdata->u.srv.port; - - // If this is our first answer, then set the GotSRV flag and start the address query - if (!query->GotSRV) - { - query->GotSRV = mDNStrue; - query->qAv4.InterfaceID = answer->InterfaceID; - AssignDomainName(&query->qAv4.qname, &answer->rdata->u.srv.target); - query->qAv6.InterfaceID = answer->InterfaceID; - AssignDomainName(&query->qAv6.qname, &answer->rdata->u.srv.target); - mDNS_StartQuery(m, &query->qAv4); - // Only do the AAAA query if this machine actually has IPv6 active - if (MachineHasActiveIPv6(m)) mDNS_StartQuery(m, &query->qAv6); - } - // If this is not our first answer, only re-issue the address query if the target host name has changed - else if ((query->qAv4.InterfaceID != query->qSRV.InterfaceID && query->qAv4.InterfaceID != answer->InterfaceID) || - !SameDomainName(&query->qAv4.qname, &answer->rdata->u.srv.target)) - { - mDNS_StopQuery(m, &query->qAv4); - if (query->qAv6.ThisQInterval >= 0) mDNS_StopQuery(m, &query->qAv6); - if (SameDomainName(&query->qAv4.qname, &answer->rdata->u.srv.target) && !PortChanged) - { - // If we get here, it means: - // 1. This is not our first SRV answer - // 2. The interface ID is different, but the target host and port are the same - // This implies that we're seeing the exact same SRV record on more than one interface, so we should - // make our address queries at least as broad as the original SRV query so that we catch all the answers. - query->qAv4.InterfaceID = query->qSRV.InterfaceID; // Will be mDNSInterface_Any, or a specific interface - query->qAv6.InterfaceID = query->qSRV.InterfaceID; - } - else - { - query->qAv4.InterfaceID = answer->InterfaceID; - AssignDomainName(&query->qAv4.qname, &answer->rdata->u.srv.target); - query->qAv6.InterfaceID = answer->InterfaceID; - AssignDomainName(&query->qAv6.qname, &answer->rdata->u.srv.target); - } - debugf("FoundServiceInfoSRV: Restarting address queries for %##s (%s)", query->qAv4.qname.c, DNSTypeName(query->qAv4.qtype)); - mDNS_StartQuery(m, &query->qAv4); - // Only do the AAAA query if this machine actually has IPv6 active - if (MachineHasActiveIPv6(m)) mDNS_StartQuery(m, &query->qAv6); - } - else if (query->ServiceInfoQueryCallback && query->GotADD && query->GotTXT && PortChanged) - { - if (++query->Answers >= 100) - debugf("**** WARNING **** Have given %lu answers for %##s (SRV) %##s %u", - query->Answers, query->qSRV.qname.c, answer->rdata->u.srv.target.c, - mDNSVal16(answer->rdata->u.srv.port)); - query->ServiceInfoQueryCallback(m, query); - } - // CAUTION: MUST NOT do anything more with query after calling query->Callback(), because the client's - // callback function is allowed to do anything, including deleting this query and freeing its memory. - } - -mDNSlocal void FoundServiceInfoTXT(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, QC_result AddRecord) - { - ServiceInfoQuery *query = (ServiceInfoQuery *)question->QuestionContext; - if (!AddRecord) return; - if (answer->rrtype != kDNSType_TXT) return; - if (answer->rdlength > sizeof(query->info->TXTinfo)) return; - - query->GotTXT = mDNStrue; - query->info->TXTlen = answer->rdlength; - query->info->TXTinfo[0] = 0; // In case answer->rdlength is zero - mDNSPlatformMemCopy(query->info->TXTinfo, answer->rdata->u.txt.c, answer->rdlength); - - verbosedebugf("FoundServiceInfoTXT: %##s GotADD=%d", query->info->name.c, query->GotADD); - - // CAUTION: MUST NOT do anything more with query after calling query->Callback(), because the client's - // callback function is allowed to do anything, including deleting this query and freeing its memory. - if (query->ServiceInfoQueryCallback && query->GotADD) - { - if (++query->Answers >= 100) - debugf("**** WARNING **** have given %lu answers for %##s (TXT) %#s...", - query->Answers, query->qSRV.qname.c, answer->rdata->u.txt.c); - query->ServiceInfoQueryCallback(m, query); - } - } - -mDNSlocal void FoundServiceInfo(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, QC_result AddRecord) - { - ServiceInfoQuery *query = (ServiceInfoQuery *)question->QuestionContext; - //LogInfo("FoundServiceInfo %d %s", AddRecord, RRDisplayString(m, answer)); - if (!AddRecord) return; - - if (answer->rrtype == kDNSType_A) - { - query->info->ip.type = mDNSAddrType_IPv4; - query->info->ip.ip.v4 = answer->rdata->u.ipv4; - } - else if (answer->rrtype == kDNSType_AAAA) - { - query->info->ip.type = mDNSAddrType_IPv6; - query->info->ip.ip.v6 = answer->rdata->u.ipv6; - } - else - { - debugf("FoundServiceInfo: answer %##s type %d (%s) unexpected", answer->name->c, answer->rrtype, DNSTypeName(answer->rrtype)); - return; - } - - query->GotADD = mDNStrue; - query->info->InterfaceID = answer->InterfaceID; - - verbosedebugf("FoundServiceInfo v%ld: %##s GotTXT=%d", query->info->ip.type, query->info->name.c, query->GotTXT); - - // CAUTION: MUST NOT do anything more with query after calling query->Callback(), because the client's - // callback function is allowed to do anything, including deleting this query and freeing its memory. - if (query->ServiceInfoQueryCallback && query->GotTXT) - { - if (++query->Answers >= 100) - debugf(answer->rrtype == kDNSType_A ? - "**** WARNING **** have given %lu answers for %##s (A) %.4a" : - "**** WARNING **** have given %lu answers for %##s (AAAA) %.16a", - query->Answers, query->qSRV.qname.c, &answer->rdata->u.data); - query->ServiceInfoQueryCallback(m, query); - } - } - -// On entry, the client must have set the name and InterfaceID fields of the ServiceInfo structure -// If the query is not interface-specific, then InterfaceID may be zero -// Each time the Callback is invoked, the remainder of the fields will have been filled in -// In addition, InterfaceID will be updated to give the interface identifier corresponding to that response -mDNSexport mStatus mDNS_StartResolveService(mDNS *const m, - ServiceInfoQuery *query, ServiceInfo *info, mDNSServiceInfoQueryCallback *Callback, void *Context) - { - mStatus status; - mDNS_Lock(m); - - query->qSRV.ThisQInterval = -1; // So that mDNS_StopResolveService() knows whether to cancel this question - query->qSRV.InterfaceID = info->InterfaceID; - query->qSRV.Target = zeroAddr; - AssignDomainName(&query->qSRV.qname, &info->name); - query->qSRV.qtype = kDNSType_SRV; - query->qSRV.qclass = kDNSClass_IN; - query->qSRV.LongLived = mDNSfalse; - query->qSRV.ExpectUnique = mDNStrue; - query->qSRV.ForceMCast = mDNSfalse; - query->qSRV.ReturnIntermed = mDNSfalse; - query->qSRV.SuppressUnusable = mDNSfalse; - query->qSRV.SearchListIndex = 0; - query->qSRV.AppendSearchDomains = 0; - query->qSRV.RetryWithSearchDomains = mDNSfalse; - query->qSRV.TimeoutQuestion = 0; - query->qSRV.WakeOnResolve = 0; - query->qSRV.qnameOrig = mDNSNULL; - query->qSRV.QuestionCallback = FoundServiceInfoSRV; - query->qSRV.QuestionContext = query; - - query->qTXT.ThisQInterval = -1; // So that mDNS_StopResolveService() knows whether to cancel this question - query->qTXT.InterfaceID = info->InterfaceID; - query->qTXT.Target = zeroAddr; - AssignDomainName(&query->qTXT.qname, &info->name); - query->qTXT.qtype = kDNSType_TXT; - query->qTXT.qclass = kDNSClass_IN; - query->qTXT.LongLived = mDNSfalse; - query->qTXT.ExpectUnique = mDNStrue; - query->qTXT.ForceMCast = mDNSfalse; - query->qTXT.ReturnIntermed = mDNSfalse; - query->qTXT.SuppressUnusable = mDNSfalse; - query->qTXT.SearchListIndex = 0; - query->qTXT.AppendSearchDomains = 0; - query->qTXT.RetryWithSearchDomains = mDNSfalse; - query->qTXT.TimeoutQuestion = 0; - query->qTXT.WakeOnResolve = 0; - query->qTXT.qnameOrig = mDNSNULL; - query->qTXT.QuestionCallback = FoundServiceInfoTXT; - query->qTXT.QuestionContext = query; - - query->qAv4.ThisQInterval = -1; // So that mDNS_StopResolveService() knows whether to cancel this question - query->qAv4.InterfaceID = info->InterfaceID; - query->qAv4.Target = zeroAddr; - query->qAv4.qname.c[0] = 0; - query->qAv4.qtype = kDNSType_A; - query->qAv4.qclass = kDNSClass_IN; - query->qAv4.LongLived = mDNSfalse; - query->qAv4.ExpectUnique = mDNStrue; - query->qAv4.ForceMCast = mDNSfalse; - query->qAv4.ReturnIntermed = mDNSfalse; - query->qAv4.SuppressUnusable = mDNSfalse; - query->qAv4.SearchListIndex = 0; - query->qAv4.AppendSearchDomains = 0; - query->qAv4.RetryWithSearchDomains = mDNSfalse; - query->qAv4.TimeoutQuestion = 0; - query->qAv4.WakeOnResolve = 0; - query->qAv4.qnameOrig = mDNSNULL; - query->qAv4.QuestionCallback = FoundServiceInfo; - query->qAv4.QuestionContext = query; - - query->qAv6.ThisQInterval = -1; // So that mDNS_StopResolveService() knows whether to cancel this question - query->qAv6.InterfaceID = info->InterfaceID; - query->qAv6.Target = zeroAddr; - query->qAv6.qname.c[0] = 0; - query->qAv6.qtype = kDNSType_AAAA; - query->qAv6.qclass = kDNSClass_IN; - query->qAv6.LongLived = mDNSfalse; - query->qAv6.ExpectUnique = mDNStrue; - query->qAv6.ForceMCast = mDNSfalse; - query->qAv6.ReturnIntermed = mDNSfalse; - query->qAv6.SuppressUnusable = mDNSfalse; - query->qAv6.SearchListIndex = 0; - query->qAv6.AppendSearchDomains = 0; - query->qAv6.RetryWithSearchDomains = mDNSfalse; - query->qAv6.TimeoutQuestion = 0; - query->qAv6.WakeOnResolve = 0; - query->qAv6.qnameOrig = mDNSNULL; - query->qAv6.QuestionCallback = FoundServiceInfo; - query->qAv6.QuestionContext = query; - - query->GotSRV = mDNSfalse; - query->GotTXT = mDNSfalse; - query->GotADD = mDNSfalse; - query->Answers = 0; - - query->info = info; - query->ServiceInfoQueryCallback = Callback; - query->ServiceInfoQueryContext = Context; - -// info->name = Must already be set up by client -// info->interface = Must already be set up by client - info->ip = zeroAddr; - info->port = zeroIPPort; - info->TXTlen = 0; - - // We use mDNS_StartQuery_internal here because we're already holding the lock - status = mDNS_StartQuery_internal(m, &query->qSRV); - if (status == mStatus_NoError) status = mDNS_StartQuery_internal(m, &query->qTXT); - if (status != mStatus_NoError) mDNS_StopResolveService(m, query); - - mDNS_Unlock(m); - return(status); - } - -mDNSexport void mDNS_StopResolveService (mDNS *const m, ServiceInfoQuery *q) - { - mDNS_Lock(m); - // We use mDNS_StopQuery_internal here because we're already holding the lock - if (q->qSRV.ThisQInterval >= 0) mDNS_StopQuery_internal(m, &q->qSRV); - if (q->qTXT.ThisQInterval >= 0) mDNS_StopQuery_internal(m, &q->qTXT); - if (q->qAv4.ThisQInterval >= 0) mDNS_StopQuery_internal(m, &q->qAv4); - if (q->qAv6.ThisQInterval >= 0) mDNS_StopQuery_internal(m, &q->qAv6); - mDNS_Unlock(m); - } - -mDNSexport mStatus mDNS_GetDomains(mDNS *const m, DNSQuestion *const question, mDNS_DomainType DomainType, const domainname *dom, - const mDNSInterfaceID InterfaceID, mDNSQuestionCallback *Callback, void *Context) - { - question->InterfaceID = InterfaceID; - question->Target = zeroAddr; - question->qtype = kDNSType_PTR; - question->qclass = kDNSClass_IN; - question->LongLived = mDNSfalse; - question->ExpectUnique = mDNSfalse; - question->ForceMCast = mDNSfalse; - question->ReturnIntermed = mDNSfalse; - question->SuppressUnusable = mDNSfalse; - question->SearchListIndex = 0; - question->AppendSearchDomains = 0; - question->RetryWithSearchDomains = mDNSfalse; - question->TimeoutQuestion = 0; - question->WakeOnResolve = 0; - question->qnameOrig = mDNSNULL; - question->QuestionCallback = Callback; - question->QuestionContext = Context; - if (DomainType > mDNS_DomainTypeMax) return(mStatus_BadParamErr); - if (!MakeDomainNameFromDNSNameString(&question->qname, mDNS_DomainTypeNames[DomainType])) return(mStatus_BadParamErr); - if (!dom) dom = &localdomain; - if (!AppendDomainName(&question->qname, dom)) return(mStatus_BadParamErr); - return(mDNS_StartQuery(m, question)); - } - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - Responder Functions -#endif - -mDNSexport mStatus mDNS_Register(mDNS *const m, AuthRecord *const rr) - { - mStatus status; - mDNS_Lock(m); - status = mDNS_Register_internal(m, rr); - mDNS_Unlock(m); - return(status); - } - -mDNSexport mStatus mDNS_Update(mDNS *const m, AuthRecord *const rr, mDNSu32 newttl, - const mDNSu16 newrdlength, RData *const newrdata, mDNSRecordUpdateCallback *Callback) - { - if (!ValidateRData(rr->resrec.rrtype, newrdlength, newrdata)) - { - LogMsg("Attempt to update record with invalid rdata: %s", GetRRDisplayString_rdb(&rr->resrec, &newrdata->u, m->MsgBuffer)); - return(mStatus_Invalid); - } - - mDNS_Lock(m); - - // If TTL is unspecified, leave TTL unchanged - if (newttl == 0) newttl = rr->resrec.rroriginalttl; - - // If we already have an update queued up which has not gone through yet, give the client a chance to free that memory - if (rr->NewRData) - { - RData *n = rr->NewRData; - rr->NewRData = mDNSNULL; // Clear the NewRData pointer ... - if (rr->UpdateCallback) - rr->UpdateCallback(m, rr, n, rr->newrdlength); // ...and let the client free this memory, if necessary - } - - rr->NewRData = newrdata; - rr->newrdlength = newrdlength; - rr->UpdateCallback = Callback; - -#ifndef UNICAST_DISABLED - if (rr->ARType != AuthRecordLocalOnly && rr->ARType != AuthRecordP2P && !IsLocalDomain(rr->resrec.name)) - { - mStatus status = uDNS_UpdateRecord(m, rr); - // The caller frees the memory on error, don't retain stale pointers - if (status != mStatus_NoError) { rr->NewRData = mDNSNULL; rr->newrdlength = 0; } - mDNS_Unlock(m); - return(status); - } -#endif - - if (RRLocalOnly(rr) || (rr->resrec.rroriginalttl == newttl && - rr->resrec.rdlength == newrdlength && mDNSPlatformMemSame(rr->resrec.rdata->u.data, newrdata->u.data, newrdlength))) - CompleteRDataUpdate(m, rr); - else - { - rr->AnnounceCount = InitialAnnounceCount; - InitializeLastAPTime(m, rr); - while (rr->NextUpdateCredit && m->timenow - rr->NextUpdateCredit >= 0) GrantUpdateCredit(rr); - if (!rr->UpdateBlocked && rr->UpdateCredits) rr->UpdateCredits--; - if (!rr->NextUpdateCredit) rr->NextUpdateCredit = NonZeroTime(m->timenow + kUpdateCreditRefreshInterval); - if (rr->AnnounceCount > rr->UpdateCredits + 1) rr->AnnounceCount = (mDNSu8)(rr->UpdateCredits + 1); - if (rr->UpdateCredits <= 5) - { - mDNSu32 delay = 6 - rr->UpdateCredits; // Delay 1 second, then 2, then 3, etc. up to 6 seconds maximum - if (!rr->UpdateBlocked) rr->UpdateBlocked = NonZeroTime(m->timenow + (mDNSs32)delay * mDNSPlatformOneSecond); - rr->ThisAPInterval *= 4; - rr->LastAPTime = rr->UpdateBlocked - rr->ThisAPInterval; - LogMsg("Excessive update rate for %##s; delaying announcement by %ld second%s", - rr->resrec.name->c, delay, delay > 1 ? "s" : ""); - } - rr->resrec.rroriginalttl = newttl; - } - - mDNS_Unlock(m); - return(mStatus_NoError); - } - -// Note: mDNS_Deregister calls mDNS_Deregister_internal which can call a user callback, which may change -// the record list and/or question list. -// Any code walking either list must use the CurrentQuestion and/or CurrentRecord mechanism to protect against this. -mDNSexport mStatus mDNS_Deregister(mDNS *const m, AuthRecord *const rr) - { - mStatus status; - mDNS_Lock(m); - status = mDNS_Deregister_internal(m, rr, mDNS_Dereg_normal); - mDNS_Unlock(m); - return(status); - } - -// Circular reference: AdvertiseInterface references mDNS_HostNameCallback, which calls mDNS_SetFQDN, which call AdvertiseInterface -mDNSlocal void mDNS_HostNameCallback(mDNS *const m, AuthRecord *const rr, mStatus result); - -mDNSlocal NetworkInterfaceInfo *FindFirstAdvertisedInterface(mDNS *const m) - { - NetworkInterfaceInfo *intf; - for (intf = m->HostInterfaces; intf; intf = intf->next) - if (intf->Advertise) break; - return(intf); - } - -mDNSlocal void AdvertiseInterface(mDNS *const m, NetworkInterfaceInfo *set) - { - char buffer[MAX_REVERSE_MAPPING_NAME]; - NetworkInterfaceInfo *primary = FindFirstAdvertisedInterface(m); - if (!primary) primary = set; // If no existing advertised interface, this new NetworkInterfaceInfo becomes our new primary - - // Send dynamic update for non-linklocal IPv4 Addresses - mDNS_SetupResourceRecord(&set->RR_A, mDNSNULL, set->InterfaceID, kDNSType_A, kHostNameTTL, kDNSRecordTypeUnique, AuthRecordAny, mDNS_HostNameCallback, set); - mDNS_SetupResourceRecord(&set->RR_PTR, mDNSNULL, set->InterfaceID, kDNSType_PTR, kHostNameTTL, kDNSRecordTypeKnownUnique, AuthRecordAny, mDNSNULL, mDNSNULL); - mDNS_SetupResourceRecord(&set->RR_HINFO, mDNSNULL, set->InterfaceID, kDNSType_HINFO, kHostNameTTL, kDNSRecordTypeUnique, AuthRecordAny, mDNSNULL, mDNSNULL); - -#if ANSWER_REMOTE_HOSTNAME_QUERIES - set->RR_A .AllowRemoteQuery = mDNStrue; - set->RR_PTR .AllowRemoteQuery = mDNStrue; - set->RR_HINFO.AllowRemoteQuery = mDNStrue; -#endif - // 1. Set up Address record to map from host name ("foo.local.") to IP address - // 2. Set up reverse-lookup PTR record to map from our address back to our host name - AssignDomainName(&set->RR_A.namestorage, &m->MulticastHostname); - if (set->ip.type == mDNSAddrType_IPv4) - { - set->RR_A.resrec.rrtype = kDNSType_A; - set->RR_A.resrec.rdata->u.ipv4 = set->ip.ip.v4; - // Note: This is reverse order compared to a normal dotted-decimal IP address, so we can't use our customary "%.4a" format code - mDNS_snprintf(buffer, sizeof(buffer), "%d.%d.%d.%d.in-addr.arpa.", - set->ip.ip.v4.b[3], set->ip.ip.v4.b[2], set->ip.ip.v4.b[1], set->ip.ip.v4.b[0]); - } - else if (set->ip.type == mDNSAddrType_IPv6) - { - int i; - set->RR_A.resrec.rrtype = kDNSType_AAAA; - set->RR_A.resrec.rdata->u.ipv6 = set->ip.ip.v6; - for (i = 0; i < 16; i++) - { - static const char hexValues[] = "0123456789ABCDEF"; - buffer[i * 4 ] = hexValues[set->ip.ip.v6.b[15 - i] & 0x0F]; - buffer[i * 4 + 1] = '.'; - buffer[i * 4 + 2] = hexValues[set->ip.ip.v6.b[15 - i] >> 4]; - buffer[i * 4 + 3] = '.'; - } - mDNS_snprintf(&buffer[64], sizeof(buffer)-64, "ip6.arpa."); - } - - MakeDomainNameFromDNSNameString(&set->RR_PTR.namestorage, buffer); - set->RR_PTR.AutoTarget = Target_AutoHost; // Tell mDNS that the target of this PTR is to be kept in sync with our host name - set->RR_PTR.ForceMCast = mDNStrue; // This PTR points to our dot-local name, so don't ever try to write it into a uDNS server - - set->RR_A.RRSet = &primary->RR_A; // May refer to self - - mDNS_Register_internal(m, &set->RR_A); - mDNS_Register_internal(m, &set->RR_PTR); - - if (!NO_HINFO && m->HIHardware.c[0] > 0 && m->HISoftware.c[0] > 0 && m->HIHardware.c[0] + m->HISoftware.c[0] <= 254) - { - mDNSu8 *p = set->RR_HINFO.resrec.rdata->u.data; - AssignDomainName(&set->RR_HINFO.namestorage, &m->MulticastHostname); - set->RR_HINFO.DependentOn = &set->RR_A; - mDNSPlatformMemCopy(p, &m->HIHardware, 1 + (mDNSu32)m->HIHardware.c[0]); - p += 1 + (int)p[0]; - mDNSPlatformMemCopy(p, &m->HISoftware, 1 + (mDNSu32)m->HISoftware.c[0]); - mDNS_Register_internal(m, &set->RR_HINFO); - } - else - { - debugf("Not creating HINFO record: platform support layer provided no information"); - set->RR_HINFO.resrec.RecordType = kDNSRecordTypeUnregistered; - } - } - -mDNSlocal void DeadvertiseInterface(mDNS *const m, NetworkInterfaceInfo *set) - { - NetworkInterfaceInfo *intf; - - // If we still have address records referring to this one, update them - NetworkInterfaceInfo *primary = FindFirstAdvertisedInterface(m); - AuthRecord *A = primary ? &primary->RR_A : mDNSNULL; - for (intf = m->HostInterfaces; intf; intf = intf->next) - if (intf->RR_A.RRSet == &set->RR_A) - intf->RR_A.RRSet = A; - - // Unregister these records. - // When doing the mDNS_Exit processing, we first call DeadvertiseInterface for each interface, so by the time the platform - // support layer gets to call mDNS_DeregisterInterface, the address and PTR records have already been deregistered for it. - // Also, in the event of a name conflict, one or more of our records will have been forcibly deregistered. - // To avoid unnecessary and misleading warning messages, we check the RecordType before calling mDNS_Deregister_internal(). - if (set->RR_A. resrec.RecordType) mDNS_Deregister_internal(m, &set->RR_A, mDNS_Dereg_normal); - if (set->RR_PTR. resrec.RecordType) mDNS_Deregister_internal(m, &set->RR_PTR, mDNS_Dereg_normal); - if (set->RR_HINFO.resrec.RecordType) mDNS_Deregister_internal(m, &set->RR_HINFO, mDNS_Dereg_normal); - } - -mDNSexport void mDNS_SetFQDN(mDNS *const m) - { - domainname newmname; - NetworkInterfaceInfo *intf; - AuthRecord *rr; - newmname.c[0] = 0; - - if (!AppendDomainLabel(&newmname, &m->hostlabel)) { LogMsg("ERROR: mDNS_SetFQDN: Cannot create MulticastHostname"); return; } - if (!AppendLiteralLabelString(&newmname, "local")) { LogMsg("ERROR: mDNS_SetFQDN: Cannot create MulticastHostname"); return; } - - mDNS_Lock(m); - - if (SameDomainNameCS(&m->MulticastHostname, &newmname)) debugf("mDNS_SetFQDN - hostname unchanged"); - else - { - AssignDomainName(&m->MulticastHostname, &newmname); - - // 1. Stop advertising our address records on all interfaces - for (intf = m->HostInterfaces; intf; intf = intf->next) - if (intf->Advertise) DeadvertiseInterface(m, intf); - - // 2. Start advertising our address records using the new name - for (intf = m->HostInterfaces; intf; intf = intf->next) - if (intf->Advertise) AdvertiseInterface(m, intf); - } - - // 3. Make sure that any AutoTarget SRV records (and the like) get updated - for (rr = m->ResourceRecords; rr; rr=rr->next) if (rr->AutoTarget) SetTargetToHostName(m, rr); - for (rr = m->DuplicateRecords; rr; rr=rr->next) if (rr->AutoTarget) SetTargetToHostName(m, rr); - - mDNS_Unlock(m); - } - -mDNSlocal void mDNS_HostNameCallback(mDNS *const m, AuthRecord *const rr, mStatus result) - { - (void)rr; // Unused parameter - - #if MDNS_DEBUGMSGS - { - char *msg = "Unknown result"; - if (result == mStatus_NoError) msg = "Name registered"; - else if (result == mStatus_NameConflict) msg = "Name conflict"; - debugf("mDNS_HostNameCallback: %##s (%s) %s (%ld)", rr->resrec.name->c, DNSTypeName(rr->resrec.rrtype), msg, result); - } - #endif - - if (result == mStatus_NoError) - { - // Notify the client that the host name is successfully registered - if (m->MainCallback) - m->MainCallback(m, mStatus_NoError); - } - else if (result == mStatus_NameConflict) - { - domainlabel oldlabel = m->hostlabel; - - // 1. First give the client callback a chance to pick a new name - if (m->MainCallback) - m->MainCallback(m, mStatus_NameConflict); - - // 2. If the client callback didn't do it, add (or increment) an index ourselves - // This needs to be case-INSENSITIVE compare, because we need to know that the name has been changed so as to - // remedy the conflict, and a name that differs only in capitalization will just suffer the exact same conflict again. - if (SameDomainLabel(m->hostlabel.c, oldlabel.c)) - IncrementLabelSuffix(&m->hostlabel, mDNSfalse); - - // 3. Generate the FQDNs from the hostlabel, - // and make sure all SRV records, etc., are updated to reference our new hostname - mDNS_SetFQDN(m); - LogMsg("Local Hostname %#s.local already in use; will try %#s.local instead", oldlabel.c, m->hostlabel.c); - } - else if (result == mStatus_MemFree) - { - // .local hostnames do not require goodbyes - we ignore the MemFree (which is sent directly by - // mDNS_Deregister_internal), and allow the caller to deallocate immediately following mDNS_DeadvertiseInterface - debugf("mDNS_HostNameCallback: MemFree (ignored)"); - } - else - LogMsg("mDNS_HostNameCallback: Unknown error %d for registration of record %s", result, rr->resrec.name->c); - } - -mDNSlocal void UpdateInterfaceProtocols(mDNS *const m, NetworkInterfaceInfo *active) - { - NetworkInterfaceInfo *intf; - active->IPv4Available = mDNSfalse; - active->IPv6Available = mDNSfalse; - for (intf = m->HostInterfaces; intf; intf = intf->next) - if (intf->InterfaceID == active->InterfaceID) - { - if (intf->ip.type == mDNSAddrType_IPv4 && intf->McastTxRx) active->IPv4Available = mDNStrue; - if (intf->ip.type == mDNSAddrType_IPv6 && intf->McastTxRx) active->IPv6Available = mDNStrue; - } - } - -mDNSlocal void RestartRecordGetZoneData(mDNS * const m) - { - AuthRecord *rr; - LogInfo("RestartRecordGetZoneData: ResourceRecords"); - for (rr = m->ResourceRecords; rr; rr=rr->next) - if (AuthRecord_uDNS(rr) && rr->state != regState_NoTarget) - { - debugf("RestartRecordGetZoneData: StartGetZoneData for %##s", rr->resrec.name->c); - // Zero out the updateid so that if we have a pending response from the server, it won't - // be accepted as a valid response. If we accept the response, we might free the new "nta" - if (rr->nta) { rr->updateid = zeroID; CancelGetZoneData(m, rr->nta); } - rr->nta = StartGetZoneData(m, rr->resrec.name, ZoneServiceUpdate, RecordRegistrationGotZoneData, rr); - } - } - -mDNSlocal void InitializeNetWakeState(mDNS *const m, NetworkInterfaceInfo *set) - { - int i; - set->NetWakeBrowse.ThisQInterval = -1; - for (i=0; i<3; i++) - { - set->NetWakeResolve[i].ThisQInterval = -1; - set->SPSAddr[i].type = mDNSAddrType_None; - } - set->NextSPSAttempt = -1; - set->NextSPSAttemptTime = m->timenow; - } - -mDNSexport void mDNS_ActivateNetWake_internal(mDNS *const m, NetworkInterfaceInfo *set) - { - NetworkInterfaceInfo *p = m->HostInterfaces; - while (p && p != set) p=p->next; - if (!p) { LogMsg("mDNS_ActivateNetWake_internal: NetworkInterfaceInfo %p not found in active list", set); return; } - - if (set->InterfaceActive) - { - LogSPS("ActivateNetWake for %s (%#a)", set->ifname, &set->ip); - mDNS_StartBrowse_internal(m, &set->NetWakeBrowse, &SleepProxyServiceType, &localdomain, set->InterfaceID, mDNSfalse, m->SPSBrowseCallback, set); - } - } - -mDNSexport void mDNS_DeactivateNetWake_internal(mDNS *const m, NetworkInterfaceInfo *set) - { - NetworkInterfaceInfo *p = m->HostInterfaces; - while (p && p != set) p=p->next; - if (!p) { LogMsg("mDNS_DeactivateNetWake_internal: NetworkInterfaceInfo %p not found in active list", set); return; } - - if (set->NetWakeBrowse.ThisQInterval >= 0) - { - int i; - LogSPS("DeactivateNetWake for %s (%#a)", set->ifname, &set->ip); - - // Stop our browse and resolve operations - mDNS_StopQuery_internal(m, &set->NetWakeBrowse); - for (i=0; i<3; i++) if (set->NetWakeResolve[i].ThisQInterval >= 0) mDNS_StopQuery_internal(m, &set->NetWakeResolve[i]); - - // Make special call to the browse callback to let it know it can to remove all records for this interface - if (m->SPSBrowseCallback) - { - mDNS_DropLockBeforeCallback(); // Allow client to legally make mDNS API calls from the callback - m->SPSBrowseCallback(m, &set->NetWakeBrowse, mDNSNULL, mDNSfalse); - mDNS_ReclaimLockAfterCallback(); // Decrement mDNS_reentrancy to block mDNS API calls again - } - - // Reset our variables back to initial state, so we're ready for when NetWake is turned back on - // (includes resetting NetWakeBrowse.ThisQInterval back to -1) - InitializeNetWakeState(m, set); - } - } - -mDNSexport mStatus mDNS_RegisterInterface(mDNS *const m, NetworkInterfaceInfo *set, mDNSBool flapping) - { - AuthRecord *rr; - mDNSBool FirstOfType = mDNStrue; - NetworkInterfaceInfo **p = &m->HostInterfaces; - - if (!set->InterfaceID) - { LogMsg("mDNS_RegisterInterface: Error! Tried to register a NetworkInterfaceInfo %#a with zero InterfaceID", &set->ip); return(mStatus_Invalid); } - - if (!mDNSAddressIsValidNonZero(&set->mask)) - { LogMsg("mDNS_RegisterInterface: Error! Tried to register a NetworkInterfaceInfo %#a with invalid mask %#a", &set->ip, &set->mask); return(mStatus_Invalid); } - - mDNS_Lock(m); - - // Assume this interface will be active now, unless we find a duplicate already in the list - set->InterfaceActive = mDNStrue; - set->IPv4Available = (mDNSu8)(set->ip.type == mDNSAddrType_IPv4 && set->McastTxRx); - set->IPv6Available = (mDNSu8)(set->ip.type == mDNSAddrType_IPv6 && set->McastTxRx); - - InitializeNetWakeState(m, set); - - // Scan list to see if this InterfaceID is already represented - while (*p) - { - if (*p == set) - { - LogMsg("mDNS_RegisterInterface: Error! Tried to register a NetworkInterfaceInfo that's already in the list"); - mDNS_Unlock(m); - return(mStatus_AlreadyRegistered); - } - - if ((*p)->InterfaceID == set->InterfaceID) - { - // This InterfaceID already represented by a different interface in the list, so mark this instance inactive for now - set->InterfaceActive = mDNSfalse; - if (set->ip.type == (*p)->ip.type) FirstOfType = mDNSfalse; - if (set->ip.type == mDNSAddrType_IPv4 && set->McastTxRx) (*p)->IPv4Available = mDNStrue; - if (set->ip.type == mDNSAddrType_IPv6 && set->McastTxRx) (*p)->IPv6Available = mDNStrue; - } - - p=&(*p)->next; - } - - set->next = mDNSNULL; - *p = set; - - if (set->Advertise) - AdvertiseInterface(m, set); - - LogInfo("mDNS_RegisterInterface: InterfaceID %p %s (%#a) %s", set->InterfaceID, set->ifname, &set->ip, - set->InterfaceActive ? - "not represented in list; marking active and retriggering queries" : - "already represented in list; marking inactive for now"); - - if (set->NetWake) mDNS_ActivateNetWake_internal(m, set); - - // In early versions of OS X the IPv6 address remains on an interface even when the interface is turned off, - // giving the false impression that there's an active representative of this interface when there really isn't. - // Therefore, when registering an interface, we want to re-trigger our questions and re-probe our Resource Records, - // even if we believe that we previously had an active representative of this interface. - if (set->McastTxRx && (FirstOfType || set->InterfaceActive)) - { - DNSQuestion *q; - // Normally, after an interface comes up, we pause half a second before beginning probing. - // This is to guard against cases where there's rapid interface changes, where we could be confused by - // seeing packets we ourselves sent just moments ago (perhaps when this interface had a different address) - // which are then echoed back after a short delay by some Ethernet switches and some 802.11 base stations. - // We don't want to do a probe, and then see a stale echo of an announcement we ourselves sent, - // and think it's a conflicting answer to our probe. - // In the case of a flapping interface, we pause for five seconds, and reduce the announcement count to one packet. - const mDNSs32 probedelay = flapping ? mDNSPlatformOneSecond * 5 : mDNSPlatformOneSecond / 2; - const mDNSu8 numannounce = flapping ? (mDNSu8)1 : InitialAnnounceCount; - - // Use a small amount of randomness: - // In the case of a network administrator turning on an Ethernet hub so that all the - // connected machines establish link at exactly the same time, we don't want them all - // to go and hit the network with identical queries at exactly the same moment. - // We set a random delay of up to InitialQuestionInterval (1/3 second). - // We must *never* set m->SuppressSending to more than that (or set it repeatedly in a way - // that causes mDNSResponder to remain in a prolonged state of SuppressSending, because - // suppressing packet sending for more than about 1/3 second can cause protocol correctness - // to start to break down (e.g. we don't answer probes fast enough, and get name conflicts). - // See mDNS: m->SuppressSending set too enthusiastically - if (!m->SuppressSending) m->SuppressSending = m->timenow + (mDNSs32)mDNSRandom((mDNSu32)InitialQuestionInterval); - - if (flapping) LogMsg("mDNS_RegisterInterface: Frequent transitions for interface %s (%#a)", set->ifname, &set->ip); - - LogInfo("mDNS_RegisterInterface: %s (%#a) probedelay %d", set->ifname, &set->ip, probedelay); - if (m->SuppressProbes == 0 || - m->SuppressProbes - NonZeroTime(m->timenow + probedelay) < 0) - m->SuppressProbes = NonZeroTime(m->timenow + probedelay); - - // Include OWNER option in packets for 60 seconds after connecting to the network. Setting - // it here also handles the wake up case as the network link comes UP after waking causing - // us to reconnect to the network. If we do this as part of the wake up code, it is possible - // that the network link comes UP after 60 seconds and we never set the OWNER option - m->AnnounceOwner = NonZeroTime(m->timenow + 60 * mDNSPlatformOneSecond); - LogInfo("mDNS_RegisterInterface: Setting AnnounceOwner"); - - for (q = m->Questions; q; q=q->next) // Scan our list of questions - if (mDNSOpaque16IsZero(q->TargetQID)) - if (!q->InterfaceID || q->InterfaceID == set->InterfaceID) // If non-specific Q, or Q on this specific interface, - { // then reactivate this question - // If flapping, delay between first and second queries is nine seconds instead of one second - mDNSBool dodelay = flapping && (q->FlappingInterface1 == set->InterfaceID || q->FlappingInterface2 == set->InterfaceID); - mDNSs32 initial = dodelay ? InitialQuestionInterval * QuestionIntervalStep2 : InitialQuestionInterval; - mDNSs32 qdelay = dodelay ? mDNSPlatformOneSecond * 5 : 0; - if (dodelay) LogInfo("No cache records expired for %##s (%s); okay to delay questions a little", q->qname.c, DNSTypeName(q->qtype)); - - if (!q->ThisQInterval || q->ThisQInterval > initial) - { - q->ThisQInterval = initial; - q->RequestUnicast = 2; // Set to 2 because is decremented once *before* we check it - } - q->LastQTime = m->timenow - q->ThisQInterval + qdelay; - q->RecentAnswerPkts = 0; - SetNextQueryTime(m,q); - } - - // For all our non-specific authoritative resource records (and any dormant records specific to this interface) - // we now need them to re-probe if necessary, and then re-announce. - for (rr = m->ResourceRecords; rr; rr=rr->next) - if (!AuthRecord_uDNS(rr)) - if (!rr->resrec.InterfaceID || rr->resrec.InterfaceID == set->InterfaceID) - { - if (rr->resrec.RecordType == kDNSRecordTypeVerified && !rr->DependentOn) rr->resrec.RecordType = kDNSRecordTypeUnique; - rr->ProbeCount = DefaultProbeCountForRecordType(rr->resrec.RecordType); - if (rr->AnnounceCount < numannounce) rr->AnnounceCount = numannounce; - rr->SendNSECNow = mDNSNULL; - InitializeLastAPTime(m, rr); - } - } - - RestartRecordGetZoneData(m); - - CheckSuppressUnusableQuestions(m); - - mDNS_UpdateAllowSleep(m); - - mDNS_Unlock(m); - return(mStatus_NoError); - } - -// Note: mDNS_DeregisterInterface calls mDNS_Deregister_internal which can call a user callback, which may change -// the record list and/or question list. -// Any code walking either list must use the CurrentQuestion and/or CurrentRecord mechanism to protect against this. -mDNSexport void mDNS_DeregisterInterface(mDNS *const m, NetworkInterfaceInfo *set, mDNSBool flapping) - { - NetworkInterfaceInfo **p = &m->HostInterfaces; - mDNSBool revalidate = mDNSfalse; - - mDNS_Lock(m); - - // Find this record in our list - while (*p && *p != set) p=&(*p)->next; - if (!*p) { debugf("mDNS_DeregisterInterface: NetworkInterfaceInfo not found in list"); mDNS_Unlock(m); return; } - - mDNS_DeactivateNetWake_internal(m, set); - - // Unlink this record from our list - *p = (*p)->next; - set->next = mDNSNULL; - - if (!set->InterfaceActive) - { - // If this interface not the active member of its set, update the v4/v6Available flags for the active member - NetworkInterfaceInfo *intf; - for (intf = m->HostInterfaces; intf; intf = intf->next) - if (intf->InterfaceActive && intf->InterfaceID == set->InterfaceID) - UpdateInterfaceProtocols(m, intf); - } - else - { - NetworkInterfaceInfo *intf = FirstInterfaceForID(m, set->InterfaceID); - if (intf) - { - LogInfo("mDNS_DeregisterInterface: Another representative of InterfaceID %p %s (%#a) exists;" - " making it active", set->InterfaceID, set->ifname, &set->ip); - if (intf->InterfaceActive) - LogMsg("mDNS_DeregisterInterface: ERROR intf->InterfaceActive already set for %s (%#a)", set->ifname, &set->ip); - intf->InterfaceActive = mDNStrue; - UpdateInterfaceProtocols(m, intf); - - if (intf->NetWake) mDNS_ActivateNetWake_internal(m, intf); - - // See if another representative *of the same type* exists. If not, we mave have gone from - // dual-stack to v6-only (or v4-only) so we need to reconfirm which records are still valid. - for (intf = m->HostInterfaces; intf; intf = intf->next) - if (intf->InterfaceID == set->InterfaceID && intf->ip.type == set->ip.type) - break; - if (!intf) revalidate = mDNStrue; - } - else - { - mDNSu32 slot; - CacheGroup *cg; - CacheRecord *rr; - DNSQuestion *q; - DNSServer *s; - - LogInfo("mDNS_DeregisterInterface: Last representative of InterfaceID %p %s (%#a) deregistered;" - " marking questions etc. dormant", set->InterfaceID, set->ifname, &set->ip); - - if (set->McastTxRx && flapping) - LogMsg("DeregisterInterface: Frequent transitions for interface %s (%#a)", set->ifname, &set->ip); - - // 1. Deactivate any questions specific to this interface, and tag appropriate questions - // so that mDNS_RegisterInterface() knows how swiftly it needs to reactivate them - for (q = m->Questions; q; q=q->next) - { - if (q->InterfaceID == set->InterfaceID) q->ThisQInterval = 0; - if (!q->InterfaceID || q->InterfaceID == set->InterfaceID) - { - q->FlappingInterface2 = q->FlappingInterface1; - q->FlappingInterface1 = set->InterfaceID; // Keep history of the last two interfaces to go away - } - } - - // 2. Flush any cache records received on this interface - revalidate = mDNSfalse; // Don't revalidate if we're flushing the records - FORALL_CACHERECORDS(slot, cg, rr) - if (rr->resrec.InterfaceID == set->InterfaceID) - { - // If this interface is deemed flapping, - // postpone deleting the cache records in case the interface comes back again - if (set->McastTxRx && flapping) - { - // For a flapping interface we want these record to go away after 30 seconds - mDNS_Reconfirm_internal(m, rr, kDefaultReconfirmTimeForFlappingInterface); - // We set UnansweredQueries = MaxUnansweredQueries so we don't waste time doing any queries for them -- - // if the interface does come back, any relevant questions will be reactivated anyway - rr->UnansweredQueries = MaxUnansweredQueries; - } - else - mDNS_PurgeCacheResourceRecord(m, rr); - } - - // 3. Any DNS servers specific to this interface are now unusable - for (s = m->DNSServers; s; s = s->next) - if (s->interface == set->InterfaceID) - { - s->interface = mDNSInterface_Any; - s->teststate = DNSServer_Disabled; - } - } - } - - // If we were advertising on this interface, deregister those address and reverse-lookup records now - if (set->Advertise) DeadvertiseInterface(m, set); - - // If we have any cache records received on this interface that went away, then re-verify them. - // In some versions of OS X the IPv6 address remains on an interface even when the interface is turned off, - // giving the false impression that there's an active representative of this interface when there really isn't. - // Don't need to do this when shutting down, because *all* interfaces are about to go away - if (revalidate && !m->ShutdownTime) - { - mDNSu32 slot; - CacheGroup *cg; - CacheRecord *rr; - FORALL_CACHERECORDS(slot, cg, rr) - if (rr->resrec.InterfaceID == set->InterfaceID) - mDNS_Reconfirm_internal(m, rr, kDefaultReconfirmTimeForFlappingInterface); - } - - CheckSuppressUnusableQuestions(m); - - mDNS_UpdateAllowSleep(m); - - mDNS_Unlock(m); - } - -mDNSlocal void ServiceCallback(mDNS *const m, AuthRecord *const rr, mStatus result) - { - ServiceRecordSet *sr = (ServiceRecordSet *)rr->RecordContext; - (void)m; // Unused parameter - - #if MDNS_DEBUGMSGS - { - char *msg = "Unknown result"; - if (result == mStatus_NoError) msg = "Name Registered"; - else if (result == mStatus_NameConflict) msg = "Name Conflict"; - else if (result == mStatus_MemFree) msg = "Memory Free"; - debugf("ServiceCallback: %##s (%s) %s (%d)", rr->resrec.name->c, DNSTypeName(rr->resrec.rrtype), msg, result); - } - #endif - - // Only pass on the NoError acknowledgement for the SRV record (when it finishes probing) - if (result == mStatus_NoError && rr != &sr->RR_SRV) return; - - // If we got a name conflict on either SRV or TXT, forcibly deregister this service, and record that we did that - if (result == mStatus_NameConflict) - { - sr->Conflict = mDNStrue; // Record that this service set had a conflict - mDNS_DeregisterService(m, sr); // Unlink the records from our list - return; - } - - if (result == mStatus_MemFree) - { - // If the SRV/TXT/PTR records, or the _services._dns-sd._udp record, or any of the subtype PTR records, - // are still in the process of deregistering, don't pass on the NameConflict/MemFree message until - // every record is finished cleaning up. - mDNSu32 i; - ExtraResourceRecord *e = sr->Extras; - - if (sr->RR_SRV.resrec.RecordType != kDNSRecordTypeUnregistered) return; - if (sr->RR_TXT.resrec.RecordType != kDNSRecordTypeUnregistered) return; - if (sr->RR_PTR.resrec.RecordType != kDNSRecordTypeUnregistered) return; - if (sr->RR_ADV.resrec.RecordType != kDNSRecordTypeUnregistered) return; - for (i=0; iNumSubTypes; i++) if (sr->SubTypes[i].resrec.RecordType != kDNSRecordTypeUnregistered) return; - - while (e) - { - if (e->r.resrec.RecordType != kDNSRecordTypeUnregistered) return; - e = e->next; - } - - // If this ServiceRecordSet was forcibly deregistered, and now its memory is ready for reuse, - // then we can now report the NameConflict to the client - if (sr->Conflict) result = mStatus_NameConflict; - - } - - LogInfo("ServiceCallback: All records %s for %##s", (result == mStatus_MemFree ? "Unregistered": "Registered"), sr->RR_PTR.resrec.name->c); - // CAUTION: MUST NOT do anything more with sr after calling sr->Callback(), because the client's callback - // function is allowed to do anything, including deregistering this service and freeing its memory. - if (sr->ServiceCallback) - sr->ServiceCallback(m, sr, result); - } - -mDNSlocal void NSSCallback(mDNS *const m, AuthRecord *const rr, mStatus result) - { - ServiceRecordSet *sr = (ServiceRecordSet *)rr->RecordContext; - if (sr->ServiceCallback) - sr->ServiceCallback(m, sr, result); - } - -// Note: -// Name is first label of domain name (any dots in the name are actual dots, not label separators) -// Type is service type (e.g. "_ipp._tcp.") -// Domain is fully qualified domain name (i.e. ending with a null label) -// We always register a TXT, even if it is empty (so that clients are not -// left waiting forever looking for a nonexistent record.) -// If the host parameter is mDNSNULL or the root domain (ASCII NUL), -// then the default host name (m->MulticastHostname) is automatically used -// If the optional target host parameter is set, then the storage it points to must remain valid for the lifetime of the service registration -mDNSexport mStatus mDNS_RegisterService(mDNS *const m, ServiceRecordSet *sr, - const domainlabel *const name, const domainname *const type, const domainname *const domain, - const domainname *const host, mDNSIPPort port, const mDNSu8 txtinfo[], mDNSu16 txtlen, - AuthRecord *SubTypes, mDNSu32 NumSubTypes, - mDNSInterfaceID InterfaceID, mDNSServiceCallback Callback, void *Context, mDNSu32 flags) - { - mStatus err; - mDNSu32 i; - mDNSu32 hostTTL; - AuthRecType artype; - mDNSu8 recordType = (flags & regFlagKnownUnique) ? kDNSRecordTypeKnownUnique : kDNSRecordTypeUnique; - - sr->ServiceCallback = Callback; - sr->ServiceContext = Context; - sr->Conflict = mDNSfalse; - - sr->Extras = mDNSNULL; - sr->NumSubTypes = NumSubTypes; - sr->SubTypes = SubTypes; - - if (InterfaceID == mDNSInterface_LocalOnly) - artype = AuthRecordLocalOnly; - else if (InterfaceID == mDNSInterface_P2P) - artype = AuthRecordP2P; - else if ((InterfaceID == mDNSInterface_Any) && (flags & regFlagIncludeP2P)) - artype = AuthRecordAnyIncludeP2P; - else - artype = AuthRecordAny; - - // Initialize the AuthRecord objects to sane values - // Need to initialize everything correctly *before* making the decision whether to do a RegisterNoSuchService and bail out - mDNS_SetupResourceRecord(&sr->RR_ADV, mDNSNULL, InterfaceID, kDNSType_PTR, kStandardTTL, kDNSRecordTypeAdvisory, artype, ServiceCallback, sr); - mDNS_SetupResourceRecord(&sr->RR_PTR, mDNSNULL, InterfaceID, kDNSType_PTR, kStandardTTL, kDNSRecordTypeShared, artype, ServiceCallback, sr); - - if (SameDomainName(type, (const domainname *) "\x4" "_ubd" "\x4" "_tcp")) - hostTTL = kHostNameSmallTTL; - else - hostTTL = kHostNameTTL; - - mDNS_SetupResourceRecord(&sr->RR_SRV, mDNSNULL, InterfaceID, kDNSType_SRV, hostTTL, recordType, artype, ServiceCallback, sr); - mDNS_SetupResourceRecord(&sr->RR_TXT, mDNSNULL, InterfaceID, kDNSType_TXT, kStandardTTL, kDNSRecordTypeUnique, artype, ServiceCallback, sr); - - // If port number is zero, that means the client is really trying to do a RegisterNoSuchService - if (mDNSIPPortIsZero(port)) - return(mDNS_RegisterNoSuchService(m, &sr->RR_SRV, name, type, domain, mDNSNULL, InterfaceID, NSSCallback, sr, (flags & regFlagIncludeP2P))); - - // If the client is registering an oversized TXT record, - // it is the client's responsibility to alloate a ServiceRecordSet structure that is large enough for it - if (sr->RR_TXT.resrec.rdata->MaxRDLength < txtlen) - sr->RR_TXT.resrec.rdata->MaxRDLength = txtlen; - - // Set up the record names - // For now we only create an advisory record for the main type, not for subtypes - // We need to gain some operational experience before we decide if there's a need to create them for subtypes too - if (ConstructServiceName(&sr->RR_ADV.namestorage, (const domainlabel*)"\x09_services", (const domainname*)"\x07_dns-sd\x04_udp", domain) == mDNSNULL) - return(mStatus_BadParamErr); - if (ConstructServiceName(&sr->RR_PTR.namestorage, mDNSNULL, type, domain) == mDNSNULL) return(mStatus_BadParamErr); - if (ConstructServiceName(&sr->RR_SRV.namestorage, name, type, domain) == mDNSNULL) return(mStatus_BadParamErr); - AssignDomainName(&sr->RR_TXT.namestorage, sr->RR_SRV.resrec.name); - - // 1. Set up the ADV record rdata to advertise our service type - AssignDomainName(&sr->RR_ADV.resrec.rdata->u.name, sr->RR_PTR.resrec.name); - - // 2. Set up the PTR record rdata to point to our service name - // We set up two additionals, so when a client asks for this PTR we automatically send the SRV and the TXT too - // Note: uDNS registration code assumes that Additional1 points to the SRV record - AssignDomainName(&sr->RR_PTR.resrec.rdata->u.name, sr->RR_SRV.resrec.name); - sr->RR_PTR.Additional1 = &sr->RR_SRV; - sr->RR_PTR.Additional2 = &sr->RR_TXT; - - // 2a. Set up any subtype PTRs to point to our service name - // If the client is using subtypes, it is the client's responsibility to have - // already set the first label of the record name to the subtype being registered - for (i=0; iSubTypes[i].resrec.name); - st.c[1+st.c[0]] = 0; // Only want the first label, not the whole FQDN (particularly for mDNS_RenameAndReregisterService()) - AppendDomainName(&st, type); - mDNS_SetupResourceRecord(&sr->SubTypes[i], mDNSNULL, InterfaceID, kDNSType_PTR, kStandardTTL, kDNSRecordTypeShared, artype, ServiceCallback, sr); - if (ConstructServiceName(&sr->SubTypes[i].namestorage, mDNSNULL, &st, domain) == mDNSNULL) return(mStatus_BadParamErr); - AssignDomainName(&sr->SubTypes[i].resrec.rdata->u.name, &sr->RR_SRV.namestorage); - sr->SubTypes[i].Additional1 = &sr->RR_SRV; - sr->SubTypes[i].Additional2 = &sr->RR_TXT; - } - - // 3. Set up the SRV record rdata. - sr->RR_SRV.resrec.rdata->u.srv.priority = 0; - sr->RR_SRV.resrec.rdata->u.srv.weight = 0; - sr->RR_SRV.resrec.rdata->u.srv.port = port; - - // Setting AutoTarget tells DNS that the target of this SRV is to be automatically kept in sync with our host name - if (host && host->c[0]) AssignDomainName(&sr->RR_SRV.resrec.rdata->u.srv.target, host); - else { sr->RR_SRV.AutoTarget = Target_AutoHost; sr->RR_SRV.resrec.rdata->u.srv.target.c[0] = '\0'; } - - // 4. Set up the TXT record rdata, - // and set DependentOn because we're depending on the SRV record to find and resolve conflicts for us - // Note: uDNS registration code assumes that DependentOn points to the SRV record - if (txtinfo == mDNSNULL) sr->RR_TXT.resrec.rdlength = 0; - else if (txtinfo != sr->RR_TXT.resrec.rdata->u.txt.c) - { - sr->RR_TXT.resrec.rdlength = txtlen; - if (sr->RR_TXT.resrec.rdlength > sr->RR_TXT.resrec.rdata->MaxRDLength) return(mStatus_BadParamErr); - mDNSPlatformMemCopy(sr->RR_TXT.resrec.rdata->u.txt.c, txtinfo, txtlen); - } - sr->RR_TXT.DependentOn = &sr->RR_SRV; - - mDNS_Lock(m); - // It is important that we register SRV first. uDNS assumes that SRV is registered first so - // that if the SRV cannot find a target, rest of the records that belong to this service - // will not be activated. - err = mDNS_Register_internal(m, &sr->RR_SRV); - // If we can't register the SRV record due to errors, bail out. It has not been inserted in - // any list and hence no need to deregister. We could probably do similar checks for other - // records below and bail out. For now, this seems to be sufficient to address rdar://9304275 - if (err) - { - mDNS_Unlock(m); - return err; - } - if (!err) err = mDNS_Register_internal(m, &sr->RR_TXT); - // We register the RR_PTR last, because we want to be sure that in the event of a forced call to - // mDNS_StartExit, the RR_PTR will be the last one to be forcibly deregistered, since that is what triggers - // the mStatus_MemFree callback to ServiceCallback, which in turn passes on the mStatus_MemFree back to - // the client callback, which is then at liberty to free the ServiceRecordSet memory at will. We need to - // make sure we've deregistered all our records and done any other necessary cleanup before that happens. - if (!err) err = mDNS_Register_internal(m, &sr->RR_ADV); - for (i=0; iSubTypes[i]); - if (!err) err = mDNS_Register_internal(m, &sr->RR_PTR); - - mDNS_Unlock(m); - - if (err) mDNS_DeregisterService(m, sr); - return(err); - } - -mDNSexport mStatus mDNS_AddRecordToService(mDNS *const m, ServiceRecordSet *sr, - ExtraResourceRecord *extra, RData *rdata, mDNSu32 ttl, mDNSu32 includeP2P) - { - ExtraResourceRecord **e; - mStatus status; - AuthRecType artype; - mDNSInterfaceID InterfaceID = sr->RR_PTR.resrec.InterfaceID; - - if (InterfaceID == mDNSInterface_LocalOnly) - artype = AuthRecordLocalOnly; - if (InterfaceID == mDNSInterface_P2P) - artype = AuthRecordP2P; - else if ((InterfaceID == mDNSInterface_Any) && includeP2P) - artype = AuthRecordAnyIncludeP2P; - else - artype = AuthRecordAny; - - extra->next = mDNSNULL; - mDNS_SetupResourceRecord(&extra->r, rdata, sr->RR_PTR.resrec.InterfaceID, - extra->r.resrec.rrtype, ttl, kDNSRecordTypeUnique, artype, ServiceCallback, sr); - AssignDomainName(&extra->r.namestorage, sr->RR_SRV.resrec.name); - - mDNS_Lock(m); - e = &sr->Extras; - while (*e) e = &(*e)->next; - - if (ttl == 0) ttl = kStandardTTL; - - extra->r.DependentOn = &sr->RR_SRV; - - debugf("mDNS_AddRecordToService adding record to %##s %s %d", - extra->r.resrec.name->c, DNSTypeName(extra->r.resrec.rrtype), extra->r.resrec.rdlength); - - status = mDNS_Register_internal(m, &extra->r); - if (status == mStatus_NoError) *e = extra; - - mDNS_Unlock(m); - return(status); - } - -mDNSexport mStatus mDNS_RemoveRecordFromService(mDNS *const m, ServiceRecordSet *sr, ExtraResourceRecord *extra, - mDNSRecordCallback MemFreeCallback, void *Context) - { - ExtraResourceRecord **e; - mStatus status; - - mDNS_Lock(m); - e = &sr->Extras; - while (*e && *e != extra) e = &(*e)->next; - if (!*e) - { - debugf("mDNS_RemoveRecordFromService failed to remove record from %##s", extra->r.resrec.name->c); - status = mStatus_BadReferenceErr; - } - else - { - debugf("mDNS_RemoveRecordFromService removing record from %##s", extra->r.resrec.name->c); - extra->r.RecordCallback = MemFreeCallback; - extra->r.RecordContext = Context; - *e = (*e)->next; - status = mDNS_Deregister_internal(m, &extra->r, mDNS_Dereg_normal); - } - mDNS_Unlock(m); - return(status); - } - -mDNSexport mStatus mDNS_RenameAndReregisterService(mDNS *const m, ServiceRecordSet *const sr, const domainlabel *newname) - { - // Note: Don't need to use mDNS_Lock(m) here, because this code is just using public routines - // mDNS_RegisterService() and mDNS_AddRecordToService(), which do the right locking internally. - domainlabel name1, name2; - domainname type, domain; - const domainname *host = sr->RR_SRV.AutoTarget ? mDNSNULL : &sr->RR_SRV.resrec.rdata->u.srv.target; - ExtraResourceRecord *extras = sr->Extras; - mStatus err; - - DeconstructServiceName(sr->RR_SRV.resrec.name, &name1, &type, &domain); - if (!newname) - { - name2 = name1; - IncrementLabelSuffix(&name2, mDNStrue); - newname = &name2; - } - - if (SameDomainName(&domain, &localdomain)) - debugf("%##s service renamed from \"%#s\" to \"%#s\"", type.c, name1.c, newname->c); - else debugf("%##s service (domain %##s) renamed from \"%#s\" to \"%#s\"",type.c, domain.c, name1.c, newname->c); - - err = mDNS_RegisterService(m, sr, newname, &type, &domain, - host, sr->RR_SRV.resrec.rdata->u.srv.port, sr->RR_TXT.resrec.rdata->u.txt.c, sr->RR_TXT.resrec.rdlength, - sr->SubTypes, sr->NumSubTypes, - sr->RR_PTR.resrec.InterfaceID, sr->ServiceCallback, sr->ServiceContext, 0); - - // mDNS_RegisterService() just reset sr->Extras to NULL. - // Fortunately we already grabbed ourselves a copy of this pointer (above), so we can now run - // through the old list of extra records, and re-add them to our freshly created service registration - while (!err && extras) - { - ExtraResourceRecord *e = extras; - extras = extras->next; - err = mDNS_AddRecordToService(m, sr, e, e->r.resrec.rdata, e->r.resrec.rroriginalttl, 0); - } - - return(err); - } - -// Note: mDNS_DeregisterService calls mDNS_Deregister_internal which can call a user callback, -// which may change the record list and/or question list. -// Any code walking either list must use the CurrentQuestion and/or CurrentRecord mechanism to protect against this. -mDNSexport mStatus mDNS_DeregisterService_drt(mDNS *const m, ServiceRecordSet *sr, mDNS_Dereg_type drt) - { - // If port number is zero, that means this was actually registered using mDNS_RegisterNoSuchService() - if (mDNSIPPortIsZero(sr->RR_SRV.resrec.rdata->u.srv.port)) return(mDNS_DeregisterNoSuchService(m, &sr->RR_SRV)); - - if (sr->RR_PTR.resrec.RecordType == kDNSRecordTypeUnregistered) - { - debugf("Service set for %##s already deregistered", sr->RR_SRV.resrec.name->c); - return(mStatus_BadReferenceErr); - } - else if (sr->RR_PTR.resrec.RecordType == kDNSRecordTypeDeregistering) - { - LogInfo("Service set for %##s already in the process of deregistering", sr->RR_SRV.resrec.name->c); - // Avoid race condition: - // If a service gets a conflict, then we set the Conflict flag to tell us to generate - // an mStatus_NameConflict message when we get the mStatus_MemFree for our PTR record. - // If the client happens to deregister the service in the middle of that process, then - // we clear the flag back to the normal state, so that we deliver a plain mStatus_MemFree - // instead of incorrectly promoting it to mStatus_NameConflict. - // This race condition is exposed particularly when the conformance test generates - // a whole batch of simultaneous conflicts across a range of services all advertised - // using the same system default name, and if we don't take this precaution then - // we end up incrementing m->nicelabel multiple times instead of just once. - // Bug when auto-renaming Computer Name after name collision - sr->Conflict = mDNSfalse; - return(mStatus_NoError); - } - else - { - mDNSu32 i; - mStatus status; - ExtraResourceRecord *e; - mDNS_Lock(m); - e = sr->Extras; - - // We use mDNS_Dereg_repeat because, in the event of a collision, some or all of the - // SRV, TXT, or Extra records could have already been automatically deregistered, and that's okay - mDNS_Deregister_internal(m, &sr->RR_SRV, mDNS_Dereg_repeat); - mDNS_Deregister_internal(m, &sr->RR_TXT, mDNS_Dereg_repeat); - - mDNS_Deregister_internal(m, &sr->RR_ADV, drt); - - // We deregister all of the extra records, but we leave the sr->Extras list intact - // in case the client wants to do a RenameAndReregister and reinstate the registration - while (e) - { - mDNS_Deregister_internal(m, &e->r, mDNS_Dereg_repeat); - e = e->next; - } - - for (i=0; iNumSubTypes; i++) - mDNS_Deregister_internal(m, &sr->SubTypes[i], drt); - - status = mDNS_Deregister_internal(m, &sr->RR_PTR, drt); - mDNS_Unlock(m); - return(status); - } - } - -// Create a registration that asserts that no such service exists with this name. -// This can be useful where there is a given function is available through several protocols. -// For example, a printer called "Stuart's Printer" may implement printing via the "pdl-datastream" and "IPP" -// protocols, but not via "LPR". In this case it would be prudent for the printer to assert the non-existence of an -// "LPR" service called "Stuart's Printer". Without this precaution, another printer than offers only "LPR" printing -// could inadvertently advertise its service under the same name "Stuart's Printer", which might be confusing for users. -mDNSexport mStatus mDNS_RegisterNoSuchService(mDNS *const m, AuthRecord *const rr, - const domainlabel *const name, const domainname *const type, const domainname *const domain, - const domainname *const host, - const mDNSInterfaceID InterfaceID, mDNSRecordCallback Callback, void *Context, mDNSBool includeP2P) - { - AuthRecType artype; - - if (InterfaceID == mDNSInterface_LocalOnly) - artype = AuthRecordLocalOnly; - else if (InterfaceID == mDNSInterface_P2P) - artype = AuthRecordP2P; - else if ((InterfaceID == mDNSInterface_Any) && includeP2P) - artype = AuthRecordAnyIncludeP2P; - else - artype = AuthRecordAny; - - mDNS_SetupResourceRecord(rr, mDNSNULL, InterfaceID, kDNSType_SRV, kHostNameTTL, kDNSRecordTypeUnique, artype, Callback, Context); - if (ConstructServiceName(&rr->namestorage, name, type, domain) == mDNSNULL) return(mStatus_BadParamErr); - rr->resrec.rdata->u.srv.priority = 0; - rr->resrec.rdata->u.srv.weight = 0; - rr->resrec.rdata->u.srv.port = zeroIPPort; - if (host && host->c[0]) AssignDomainName(&rr->resrec.rdata->u.srv.target, host); - else rr->AutoTarget = Target_AutoHost; - return(mDNS_Register(m, rr)); - } - -mDNSexport mStatus mDNS_AdvertiseDomains(mDNS *const m, AuthRecord *rr, - mDNS_DomainType DomainType, const mDNSInterfaceID InterfaceID, char *domname) - { - AuthRecType artype; - - if (InterfaceID == mDNSInterface_LocalOnly) - artype = AuthRecordLocalOnly; - else if (InterfaceID == mDNSInterface_P2P) - artype = AuthRecordP2P; - else - artype = AuthRecordAny; - mDNS_SetupResourceRecord(rr, mDNSNULL, InterfaceID, kDNSType_PTR, kStandardTTL, kDNSRecordTypeShared, artype, mDNSNULL, mDNSNULL); - if (!MakeDomainNameFromDNSNameString(&rr->namestorage, mDNS_DomainTypeNames[DomainType])) return(mStatus_BadParamErr); - if (!MakeDomainNameFromDNSNameString(&rr->resrec.rdata->u.name, domname)) return(mStatus_BadParamErr); - return(mDNS_Register(m, rr)); - } - -mDNSlocal mDNSBool mDNS_IdUsedInResourceRecordsList(mDNS * const m, mDNSOpaque16 id) - { - AuthRecord *r; - for (r = m->ResourceRecords; r; r=r->next) if (mDNSSameOpaque16(id, r->updateid)) return mDNStrue; - return mDNSfalse; - } - -mDNSlocal mDNSBool mDNS_IdUsedInQuestionsList(mDNS * const m, mDNSOpaque16 id) - { - DNSQuestion *q; - for (q = m->Questions; q; q=q->next) if (mDNSSameOpaque16(id, q->TargetQID)) return mDNStrue; - return mDNSfalse; - } - -mDNSexport mDNSOpaque16 mDNS_NewMessageID(mDNS * const m) - { - mDNSOpaque16 id; - int i; - - for (i=0; i<10; i++) - { - id = mDNSOpaque16fromIntVal(1 + (mDNSu16)mDNSRandom(0xFFFE)); - if (!mDNS_IdUsedInResourceRecordsList(m, id) && !mDNS_IdUsedInQuestionsList(m, id)) break; - } - - debugf("mDNS_NewMessageID: %5d", mDNSVal16(id)); - - return id; - } - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - Sleep Proxy Server -#endif - -mDNSlocal void RestartARPProbing(mDNS *const m, AuthRecord *const rr) - { - // If we see an ARP from a machine we think is sleeping, then either - // (i) the machine has woken, or - // (ii) it's just a stray old packet from before the machine slept - // To handle the second case, we reset ProbeCount, so we'll suppress our own answers for a while, to avoid - // generating ARP conflicts with a waking machine, and set rr->LastAPTime so we'll start probing again in 10 seconds. - // If the machine has just woken then we'll discard our records when we see the first new mDNS probe from that machine. - // If it was a stray old packet, then after 10 seconds we'll probe again and then start answering ARPs again. In this case we *do* - // need to send new ARP Announcements, because the owner's ARP broadcasts will have updated neighboring ARP caches, so we need to - // re-assert our (temporary) ownership of that IP address in order to receive subsequent packets addressed to that IPv4 address. - - rr->resrec.RecordType = kDNSRecordTypeUnique; - rr->ProbeCount = DefaultProbeCountForTypeUnique; - - // If we haven't started announcing yet (and we're not already in ten-second-delay mode) the machine is probably - // still going to sleep, so we just reset rr->ProbeCount so we'll continue probing until it stops responding. - // If we *have* started announcing, the machine is probably in the process of waking back up, so in that case - // we're more cautious and we wait ten seconds before probing it again. We do this because while waking from - // sleep, some network interfaces tend to lose or delay inbound packets, and without this delay, if the waking machine - // didn't answer our three probes within three seconds then we'd announce and cause it an unnecessary address conflict. - if (rr->AnnounceCount == InitialAnnounceCount && m->timenow - rr->LastAPTime >= 0) - InitializeLastAPTime(m, rr); - else - { - rr->AnnounceCount = InitialAnnounceCount; - rr->ThisAPInterval = mDNSPlatformOneSecond; - rr->LastAPTime = m->timenow + mDNSPlatformOneSecond * 9; // Send first packet at rr->LastAPTime + rr->ThisAPInterval, i.e. 10 seconds from now - SetNextAnnounceProbeTime(m, rr); - } - } - -mDNSlocal void mDNSCoreReceiveRawARP(mDNS *const m, const ARP_EthIP *const arp, const mDNSInterfaceID InterfaceID) - { - static const mDNSOpaque16 ARP_op_request = { { 0, 1 } }; - AuthRecord *rr; - NetworkInterfaceInfo *intf = FirstInterfaceForID(m, InterfaceID); - if (!intf) return; - - mDNS_Lock(m); - - // Pass 1: - // Process ARP Requests and Probes (but not Announcements), and generate an ARP Reply if necessary. - // We also process ARPs from our own kernel (and 'answer' them by injecting a local ARP table entry) - // We ignore ARP Announcements here -- Announcements are not questions, they're assertions, so we don't need to answer them. - // The times we might need to react to an ARP Announcement are: - // (i) as an indication that the host in question has not gone to sleep yet (so we should delay beginning to proxy for it) or - // (ii) if it's a conflicting Announcement from another host - // -- and we check for these in Pass 2 below. - if (mDNSSameOpaque16(arp->op, ARP_op_request) && !mDNSSameIPv4Address(arp->spa, arp->tpa)) - { - for (rr = m->ResourceRecords; rr; rr=rr->next) - if (rr->resrec.InterfaceID == InterfaceID && rr->resrec.RecordType != kDNSRecordTypeDeregistering && - rr->AddressProxy.type == mDNSAddrType_IPv4 && mDNSSameIPv4Address(rr->AddressProxy.ip.v4, arp->tpa)) - { - static const char msg1[] = "ARP Req from owner -- re-probing"; - static const char msg2[] = "Ignoring ARP Request from "; - static const char msg3[] = "Creating Local ARP Cache entry "; - static const char msg4[] = "Answering ARP Request from "; - const char *const msg = mDNSSameEthAddress(&arp->sha, &rr->WakeUp.IMAC) ? msg1 : - (rr->AnnounceCount == InitialAnnounceCount) ? msg2 : - mDNSSameEthAddress(&arp->sha, &intf->MAC) ? msg3 : msg4; - LogSPS("%-7s %s %.6a %.4a for %.4a -- H-MAC %.6a I-MAC %.6a %s", - intf->ifname, msg, &arp->sha, &arp->spa, &arp->tpa, &rr->WakeUp.HMAC, &rr->WakeUp.IMAC, ARDisplayString(m, rr)); - if (msg == msg1) RestartARPProbing(m, rr); - else if (msg == msg3) mDNSPlatformSetLocalAddressCacheEntry(m, &rr->AddressProxy, &rr->WakeUp.IMAC, InterfaceID); - else if (msg == msg4) SendARP(m, 2, rr, &arp->tpa, &arp->sha, &arp->spa, &arp->sha); - } - } - - // Pass 2: - // For all types of ARP packet we check the Sender IP address to make sure it doesn't conflict with any AddressProxy record we're holding. - // (Strictly speaking we're only checking Announcement/Request/Reply packets, since ARP Probes have zero Sender IP address, - // so by definition (and by design) they can never conflict with any real (i.e. non-zero) IP address). - // We ignore ARPs we sent ourselves (Sender MAC address is our MAC address) because our own proxy ARPs do not constitute a conflict that we need to handle. - // If we see an apparently conflicting ARP, we check the sender hardware address: - // If the sender hardware address is the original owner this is benign, so we just suppress our own proxy answering for a while longer. - // If the sender hardware address is *not* the original owner, then this is a conflict, and we need to wake the sleeping machine to handle it. - if (mDNSSameEthAddress(&arp->sha, &intf->MAC)) - debugf("ARP from self for %.4a", &arp->tpa); - else - { - if (!mDNSSameIPv4Address(arp->spa, zerov4Addr)) - for (rr = m->ResourceRecords; rr; rr=rr->next) - if (rr->resrec.InterfaceID == InterfaceID && rr->resrec.RecordType != kDNSRecordTypeDeregistering && - rr->AddressProxy.type == mDNSAddrType_IPv4 && mDNSSameIPv4Address(rr->AddressProxy.ip.v4, arp->spa)) - { - RestartARPProbing(m, rr); - if (mDNSSameEthAddress(&arp->sha, &rr->WakeUp.IMAC)) - LogSPS("%-7s ARP %s from owner %.6a %.4a for %-15.4a -- re-starting probing for %s", intf->ifname, - mDNSSameIPv4Address(arp->spa, arp->tpa) ? "Announcement " : mDNSSameOpaque16(arp->op, ARP_op_request) ? "Request " : "Response ", - &arp->sha, &arp->spa, &arp->tpa, ARDisplayString(m, rr)); - else - { - LogMsg("%-7s Conflicting ARP from %.6a %.4a for %.4a -- waking H-MAC %.6a I-MAC %.6a %s", intf->ifname, - &arp->sha, &arp->spa, &arp->tpa, &rr->WakeUp.HMAC, &rr->WakeUp.IMAC, ARDisplayString(m, rr)); - ScheduleWakeup(m, rr->resrec.InterfaceID, &rr->WakeUp.HMAC); - } - } - } - - mDNS_Unlock(m); - } - -/* -// Option 1 is Source Link Layer Address Option -// Option 2 is Target Link Layer Address Option -mDNSlocal const mDNSEthAddr *GetLinkLayerAddressOption(const IPv6NDP *const ndp, const mDNSu8 *const end, mDNSu8 op) - { - const mDNSu8 *options = (mDNSu8 *)(ndp+1); - while (options < end) - { - debugf("NDP Option %02X len %2d %d", options[0], options[1], end - options); - if (options[0] == op && options[1] == 1) return (const mDNSEthAddr*)(options+2); - options += options[1] * 8; - } - return mDNSNULL; - } -*/ - -mDNSlocal void mDNSCoreReceiveRawND(mDNS *const m, const mDNSEthAddr *const sha, const mDNSv6Addr *spa, - const IPv6NDP *const ndp, const mDNSu8 *const end, const mDNSInterfaceID InterfaceID) - { - AuthRecord *rr; - NetworkInterfaceInfo *intf = FirstInterfaceForID(m, InterfaceID); - if (!intf) return; - - mDNS_Lock(m); - - // Pass 1: Process Neighbor Solicitations, and generate a Neighbor Advertisement if necessary. - if (ndp->type == NDP_Sol) - { - //const mDNSEthAddr *const sha = GetLinkLayerAddressOption(ndp, end, NDP_SrcLL); - (void)end; - for (rr = m->ResourceRecords; rr; rr=rr->next) - if (rr->resrec.InterfaceID == InterfaceID && rr->resrec.RecordType != kDNSRecordTypeDeregistering && - rr->AddressProxy.type == mDNSAddrType_IPv6 && mDNSSameIPv6Address(rr->AddressProxy.ip.v6, ndp->target)) - { - static const char msg1[] = "NDP Req from owner -- re-probing"; - static const char msg2[] = "Ignoring NDP Request from "; - static const char msg3[] = "Creating Local NDP Cache entry "; - static const char msg4[] = "Answering NDP Request from "; - static const char msg5[] = "Answering NDP Probe from "; - const char *const msg = sha && mDNSSameEthAddress(sha, &rr->WakeUp.IMAC) ? msg1 : - (rr->AnnounceCount == InitialAnnounceCount) ? msg2 : - sha && mDNSSameEthAddress(sha, &intf->MAC) ? msg3 : - spa && mDNSIPv6AddressIsZero(*spa) ? msg4 : msg5; - LogSPS("%-7s %s %.6a %.16a for %.16a -- H-MAC %.6a I-MAC %.6a %s", - intf->ifname, msg, sha, spa, &ndp->target, &rr->WakeUp.HMAC, &rr->WakeUp.IMAC, ARDisplayString(m, rr)); - if (msg == msg1) RestartARPProbing(m, rr); - else if (msg == msg3) - { - if (!(m->KnownBugs & mDNS_KnownBug_LimitedIPv6)) - mDNSPlatformSetLocalAddressCacheEntry(m, &rr->AddressProxy, &rr->WakeUp.IMAC, InterfaceID); - } - else if (msg == msg4) SendNDP(m, NDP_Adv, NDP_Solicited, rr, &ndp->target, mDNSNULL, spa, sha ); - else if (msg == msg5) SendNDP(m, NDP_Adv, 0, rr, &ndp->target, mDNSNULL, &AllHosts_v6, &AllHosts_v6_Eth); - } - } - - // Pass 2: For all types of NDP packet we check the Sender IP address to make sure it doesn't conflict with any AddressProxy record we're holding. - if (mDNSSameEthAddress(sha, &intf->MAC)) - debugf("NDP from self for %.16a", &ndp->target); - else - { - // For Neighbor Advertisements we check the Target address field, not the actual IPv6 source address. - // When a machine has both link-local and routable IPv6 addresses, it may send NDP packets making assertions - // about its routable IPv6 address, using its link-local address as the source address for all NDP packets. - // Hence it is the NDP target address we care about, not the actual packet source address. - if (ndp->type == NDP_Adv) spa = &ndp->target; - if (!mDNSSameIPv6Address(*spa, zerov6Addr)) - for (rr = m->ResourceRecords; rr; rr=rr->next) - if (rr->resrec.InterfaceID == InterfaceID && rr->resrec.RecordType != kDNSRecordTypeDeregistering && - rr->AddressProxy.type == mDNSAddrType_IPv6 && mDNSSameIPv6Address(rr->AddressProxy.ip.v6, *spa)) - { - RestartARPProbing(m, rr); - if (mDNSSameEthAddress(sha, &rr->WakeUp.IMAC)) - LogSPS("%-7s NDP %s from owner %.6a %.16a for %.16a -- re-starting probing for %s", intf->ifname, - ndp->type == NDP_Sol ? "Solicitation " : "Advertisement", sha, spa, &ndp->target, ARDisplayString(m, rr)); - else - { - LogMsg("%-7s Conflicting NDP from %.6a %.16a for %.16a -- waking H-MAC %.6a I-MAC %.6a %s", intf->ifname, - sha, spa, &ndp->target, &rr->WakeUp.HMAC, &rr->WakeUp.IMAC, ARDisplayString(m, rr)); - ScheduleWakeup(m, rr->resrec.InterfaceID, &rr->WakeUp.HMAC); - } - } - } - - mDNS_Unlock(m); - } - -mDNSlocal void mDNSCoreReceiveRawTransportPacket(mDNS *const m, const mDNSEthAddr *const sha, const mDNSAddr *const src, const mDNSAddr *const dst, const mDNSu8 protocol, - const mDNSu8 *const p, const TransportLayerPacket *const t, const mDNSu8 *const end, const mDNSInterfaceID InterfaceID, const mDNSu16 len) - { - const mDNSIPPort port = (protocol == 0x06) ? t->tcp.dst : (protocol == 0x11) ? t->udp.dst : zeroIPPort; - mDNSBool wake = mDNSfalse; - - switch (protocol) - { - #define XX wake ? "Received" : "Ignoring", end-p - case 0x01: LogSPS("Ignoring %d-byte ICMP from %#a to %#a", end-p, src, dst); - break; - - case 0x06: { - #define SSH_AsNumber 22 - static const mDNSIPPort SSH = { { SSH_AsNumber >> 8, SSH_AsNumber & 0xFF } }; - - // Plan to wake if - // (a) RST is not set, AND - // (b) packet is SYN, SYN+FIN, or plain data packet (no SYN or FIN). We won't wake for FIN alone. - wake = (!(t->tcp.flags & 4) && (t->tcp.flags & 3) != 1); - - // For now, to reduce spurious wakeups, we wake only for TCP SYN, - // except for ssh connections, where we'll wake for plain data packets too - if (!mDNSSameIPPort(port, SSH) && !(t->tcp.flags & 2)) wake = mDNSfalse; - - LogSPS("%s %d-byte TCP from %#a:%d to %#a:%d%s%s%s", XX, - src, mDNSVal16(t->tcp.src), dst, mDNSVal16(port), - (t->tcp.flags & 2) ? " SYN" : "", - (t->tcp.flags & 1) ? " FIN" : "", - (t->tcp.flags & 4) ? " RST" : ""); - } - break; - - case 0x11: { - #define ARD_AsNumber 3283 - static const mDNSIPPort ARD = { { ARD_AsNumber >> 8, ARD_AsNumber & 0xFF } }; - const mDNSu16 udplen = (mDNSu16)((mDNSu16)t->bytes[4] << 8 | t->bytes[5]); // Length *including* 8-byte UDP header - if (udplen >= sizeof(UDPHeader)) - { - const mDNSu16 datalen = udplen - sizeof(UDPHeader); - wake = mDNStrue; - - // For Back to My Mac UDP port 4500 (IPSEC) packets, we do some special handling - if (mDNSSameIPPort(port, IPSECPort)) - { - // Specifically ignore NAT keepalive packets - if (datalen == 1 && end >= &t->bytes[9] && t->bytes[8] == 0xFF) wake = mDNSfalse; - else - { - // Skip over the Non-ESP Marker if present - const mDNSBool NonESP = (end >= &t->bytes[12] && t->bytes[8] == 0 && t->bytes[9] == 0 && t->bytes[10] == 0 && t->bytes[11] == 0); - const IKEHeader *const ike = (IKEHeader *)(t + (NonESP ? 12 : 8)); - const mDNSu16 ikelen = datalen - (NonESP ? 4 : 0); - if (ikelen >= sizeof(IKEHeader) && end >= ((mDNSu8 *)ike) + sizeof(IKEHeader)) - if ((ike->Version & 0x10) == 0x10) - { - // ExchangeType == 5 means 'Informational' - // ExchangeType == 34 means 'IKE_SA_INIT' - if (ike->ExchangeType == 5 || ike->ExchangeType == 34) wake = mDNSfalse; - LogSPS("%s %d-byte IKE ExchangeType %d", XX, ike->ExchangeType); - } - } - } - - // For now, because we haven't yet worked out a clean elegant way to do this, we just special-case the - // Apple Remote Desktop port number -- we ignore all packets to UDP 3283 (the "Net Assistant" port), - // except for Apple Remote Desktop's explicit manual wakeup packet, which looks like this: - // UDP header (8 bytes) - // Payload: 13 88 00 6a 41 4e 41 20 (8 bytes) ffffffffffff (6 bytes) 16xMAC (96 bytes) = 110 bytes total - if (mDNSSameIPPort(port, ARD)) wake = (datalen >= 110 && end >= &t->bytes[10] && t->bytes[8] == 0x13 && t->bytes[9] == 0x88); - - LogSPS("%s %d-byte UDP from %#a:%d to %#a:%d", XX, src, mDNSVal16(t->udp.src), dst, mDNSVal16(port)); - } - } - break; - - case 0x3A: if (&t->bytes[len] <= end) - { - mDNSu16 checksum = IPv6CheckSum(&src->ip.v6, &dst->ip.v6, protocol, t->bytes, len); - if (!checksum) mDNSCoreReceiveRawND(m, sha, &src->ip.v6, &t->ndp, &t->bytes[len], InterfaceID); - else LogInfo("IPv6CheckSum bad %04X %02X%02X from %#a to %#a", checksum, t->bytes[2], t->bytes[3], src, dst); - } - break; - - default: LogSPS("Ignoring %d-byte IP packet unknown protocol %d from %#a to %#a", end-p, protocol, src, dst); - break; - } - - if (wake) - { - AuthRecord *rr, *r2; - - mDNS_Lock(m); - for (rr = m->ResourceRecords; rr; rr=rr->next) - if (rr->resrec.InterfaceID == InterfaceID && - rr->resrec.RecordType != kDNSRecordTypeDeregistering && - rr->AddressProxy.type && mDNSSameAddress(&rr->AddressProxy, dst)) - { - const mDNSu8 *const tp = (protocol == 6) ? (const mDNSu8 *)"\x4_tcp" : (const mDNSu8 *)"\x4_udp"; - for (r2 = m->ResourceRecords; r2; r2=r2->next) - if (r2->resrec.InterfaceID == InterfaceID && mDNSSameEthAddress(&r2->WakeUp.HMAC, &rr->WakeUp.HMAC) && - r2->resrec.RecordType != kDNSRecordTypeDeregistering && - r2->resrec.rrtype == kDNSType_SRV && mDNSSameIPPort(r2->resrec.rdata->u.srv.port, port) && - SameDomainLabel(ThirdLabel(r2->resrec.name)->c, tp)) - break; - if (!r2 && mDNSSameIPPort(port, IPSECPort)) r2 = rr; // So that we wake for BTMM IPSEC packets, even without a matching SRV record - if (r2) - { - LogMsg("Waking host at %s %#a H-MAC %.6a I-MAC %.6a for %s", - InterfaceNameForID(m, rr->resrec.InterfaceID), dst, &rr->WakeUp.HMAC, &rr->WakeUp.IMAC, ARDisplayString(m, r2)); - ScheduleWakeup(m, rr->resrec.InterfaceID, &rr->WakeUp.HMAC); - } - else - LogSPS("Sleeping host at %s %#a %.6a has no service on %#s %d", - InterfaceNameForID(m, rr->resrec.InterfaceID), dst, &rr->WakeUp.HMAC, tp, mDNSVal16(port)); - } - mDNS_Unlock(m); - } - } - -mDNSexport void mDNSCoreReceiveRawPacket(mDNS *const m, const mDNSu8 *const p, const mDNSu8 *const end, const mDNSInterfaceID InterfaceID) - { - static const mDNSOpaque16 Ethertype_ARP = { { 0x08, 0x06 } }; // Ethertype 0x0806 = ARP - static const mDNSOpaque16 Ethertype_IPv4 = { { 0x08, 0x00 } }; // Ethertype 0x0800 = IPv4 - static const mDNSOpaque16 Ethertype_IPv6 = { { 0x86, 0xDD } }; // Ethertype 0x86DD = IPv6 - static const mDNSOpaque16 ARP_hrd_eth = { { 0x00, 0x01 } }; // Hardware address space (Ethernet = 1) - static const mDNSOpaque16 ARP_pro_ip = { { 0x08, 0x00 } }; // Protocol address space (IP = 0x0800) - - // Note: BPF guarantees that the NETWORK LAYER header will be word aligned, not the link-layer header. - // In other words, we can safely assume that pkt below (ARP, IPv4 or IPv6) is properly word aligned, - // but if pkt is 4-byte aligned, that necessarily means that eth CANNOT also be 4-byte aligned - // since it points to a an address 14 bytes before pkt. - const EthernetHeader *const eth = (const EthernetHeader *)p; - const NetworkLayerPacket *const pkt = (const NetworkLayerPacket *)(eth+1); - mDNSAddr src, dst; - #define RequiredCapLen(P) ((P)==0x01 ? 4 : (P)==0x06 ? 20 : (P)==0x11 ? 8 : (P)==0x3A ? 24 : 0) - - // Is ARP? Length must be at least 14 + 28 = 42 bytes - if (end >= p+42 && mDNSSameOpaque16(eth->ethertype, Ethertype_ARP) && mDNSSameOpaque16(pkt->arp.hrd, ARP_hrd_eth) && mDNSSameOpaque16(pkt->arp.pro, ARP_pro_ip)) - mDNSCoreReceiveRawARP(m, &pkt->arp, InterfaceID); - // Is IPv4 with zero fragmentation offset? Length must be at least 14 + 20 = 34 bytes - else if (end >= p+34 && mDNSSameOpaque16(eth->ethertype, Ethertype_IPv4) && (pkt->v4.flagsfrags.b[0] & 0x1F) == 0 && pkt->v4.flagsfrags.b[1] == 0) - { - const mDNSu8 *const trans = p + 14 + (pkt->v4.vlen & 0xF) * 4; - debugf("Got IPv4 %02X from %.4a to %.4a", pkt->v4.protocol, &pkt->v4.src, &pkt->v4.dst); - src.type = mDNSAddrType_IPv4; src.ip.v4 = pkt->v4.src; - dst.type = mDNSAddrType_IPv4; dst.ip.v4 = pkt->v4.dst; - if (end >= trans + RequiredCapLen(pkt->v4.protocol)) - mDNSCoreReceiveRawTransportPacket(m, ð->src, &src, &dst, pkt->v4.protocol, p, (TransportLayerPacket*)trans, end, InterfaceID, 0); - } - // Is IPv6? Length must be at least 14 + 28 = 42 bytes - else if (end >= p+54 && mDNSSameOpaque16(eth->ethertype, Ethertype_IPv6)) - { - const mDNSu8 *const trans = p + 54; - debugf("Got IPv6 %02X from %.16a to %.16a", pkt->v6.pro, &pkt->v6.src, &pkt->v6.dst); - src.type = mDNSAddrType_IPv6; src.ip.v6 = pkt->v6.src; - dst.type = mDNSAddrType_IPv6; dst.ip.v6 = pkt->v6.dst; - if (end >= trans + RequiredCapLen(pkt->v6.pro)) - mDNSCoreReceiveRawTransportPacket(m, ð->src, &src, &dst, pkt->v6.pro, p, (TransportLayerPacket*)trans, end, InterfaceID, - (mDNSu16)pkt->bytes[4] << 8 | pkt->bytes[5]); - } - } - -mDNSlocal void ConstructSleepProxyServerName(mDNS *const m, domainlabel *name) - { - name->c[0] = (mDNSu8)mDNS_snprintf((char*)name->c+1, 62, "%d-%d-%d-%d %#s", - m->SPSType, m->SPSPortability, m->SPSMarginalPower, m->SPSTotalPower, &m->nicelabel); - } - -mDNSlocal void SleepProxyServerCallback(mDNS *const m, ServiceRecordSet *const srs, mStatus result) - { - if (result == mStatus_NameConflict) - mDNS_RenameAndReregisterService(m, srs, mDNSNULL); - else if (result == mStatus_MemFree) - { - if (m->SleepState) - m->SPSState = 3; - else - { - m->SPSState = (mDNSu8)(m->SPSSocket != mDNSNULL); - if (m->SPSState) - { - domainlabel name; - ConstructSleepProxyServerName(m, &name); - mDNS_RegisterService(m, srs, - &name, &SleepProxyServiceType, &localdomain, - mDNSNULL, m->SPSSocket->port, // Host, port - (mDNSu8 *)"", 1, // TXT data, length - mDNSNULL, 0, // Subtypes (none) - mDNSInterface_Any, // Interface ID - SleepProxyServerCallback, mDNSNULL, 0); // Callback, context, flags - } - LogSPS("Sleep Proxy Server %#s %s", srs->RR_SRV.resrec.name->c, m->SPSState ? "started" : "stopped"); - } - } - } - -// Called with lock held -mDNSexport void mDNSCoreBeSleepProxyServer_internal(mDNS *const m, mDNSu8 sps, mDNSu8 port, mDNSu8 marginalpower, mDNSu8 totpower) - { - // This routine uses mDNS_DeregisterService and calls SleepProxyServerCallback, so we execute in user callback context - mDNS_DropLockBeforeCallback(); - - // If turning off SPS, close our socket - // (Do this first, BEFORE calling mDNS_DeregisterService below) - if (!sps && m->SPSSocket) { mDNSPlatformUDPClose(m->SPSSocket); m->SPSSocket = mDNSNULL; } - - // If turning off, or changing type, deregister old name - if (m->SPSState == 1 && sps != m->SPSType) - { m->SPSState = 2; mDNS_DeregisterService_drt(m, &m->SPSRecords, sps ? mDNS_Dereg_rapid : mDNS_Dereg_normal); } - - // Record our new SPS parameters - m->SPSType = sps; - m->SPSPortability = port; - m->SPSMarginalPower = marginalpower; - m->SPSTotalPower = totpower; - - // If turning on, open socket and advertise service - if (sps) - { - if (!m->SPSSocket) - { - m->SPSSocket = mDNSPlatformUDPSocket(m, zeroIPPort); - if (!m->SPSSocket) { LogMsg("mDNSCoreBeSleepProxyServer: Failed to allocate SPSSocket"); goto fail; } - } - if (m->SPSState == 0) SleepProxyServerCallback(m, &m->SPSRecords, mStatus_MemFree); - } - else if (m->SPSState) - { - LogSPS("mDNSCoreBeSleepProxyServer turning off from state %d; will wake clients", m->SPSState); - m->NextScheduledSPS = m->timenow; - } -fail: - mDNS_ReclaimLockAfterCallback(); - } - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - Startup and Shutdown -#endif - -mDNSlocal void mDNS_GrowCache_internal(mDNS *const m, CacheEntity *storage, mDNSu32 numrecords) - { - if (storage && numrecords) - { - mDNSu32 i; - debugf("Adding cache storage for %d more records (%d bytes)", numrecords, numrecords*sizeof(CacheEntity)); - for (i=0; irrcache_free; - m->rrcache_free = storage; - m->rrcache_size += numrecords; - } - } - -mDNSexport void mDNS_GrowCache(mDNS *const m, CacheEntity *storage, mDNSu32 numrecords) - { - mDNS_Lock(m); - mDNS_GrowCache_internal(m, storage, numrecords); - mDNS_Unlock(m); - } - -mDNSexport mStatus mDNS_Init(mDNS *const m, mDNS_PlatformSupport *const p, - CacheEntity *rrcachestorage, mDNSu32 rrcachesize, - mDNSBool AdvertiseLocalAddresses, mDNSCallback *Callback, void *Context) - { - mDNSu32 slot; - mDNSs32 timenow; - mStatus result; - - if (!rrcachestorage) rrcachesize = 0; - - m->p = p; - m->KnownBugs = 0; - m->CanReceiveUnicastOn5353 = mDNSfalse; // Assume we can't receive unicasts on 5353, unless platform layer tells us otherwise - m->AdvertiseLocalAddresses = AdvertiseLocalAddresses; - m->DivertMulticastAdvertisements = mDNSfalse; - m->mDNSPlatformStatus = mStatus_Waiting; - m->UnicastPort4 = zeroIPPort; - m->UnicastPort6 = zeroIPPort; - m->PrimaryMAC = zeroEthAddr; - m->MainCallback = Callback; - m->MainContext = Context; - m->rec.r.resrec.RecordType = 0; - - // For debugging: To catch and report locking failures - m->mDNS_busy = 0; - m->mDNS_reentrancy = 0; - m->ShutdownTime = 0; - m->lock_rrcache = 0; - m->lock_Questions = 0; - m->lock_Records = 0; - - // Task Scheduling variables - result = mDNSPlatformTimeInit(); - if (result != mStatus_NoError) return(result); - m->timenow_adjust = (mDNSs32)mDNSRandom(0xFFFFFFFF); - timenow = mDNS_TimeNow_NoLock(m); - - m->timenow = 0; // MUST only be set within mDNS_Lock/mDNS_Unlock section - m->timenow_last = timenow; - m->NextScheduledEvent = timenow; - m->SuppressSending = timenow; - m->NextCacheCheck = timenow + 0x78000000; - m->NextScheduledQuery = timenow + 0x78000000; - m->NextScheduledProbe = timenow + 0x78000000; - m->NextScheduledResponse = timenow + 0x78000000; - m->NextScheduledNATOp = timenow + 0x78000000; - m->NextScheduledSPS = timenow + 0x78000000; - m->NextScheduledStopTime = timenow + 0x78000000; - m->RandomQueryDelay = 0; - m->RandomReconfirmDelay = 0; - m->PktNum = 0; - m->LocalRemoveEvents = mDNSfalse; - m->SleepState = SleepState_Awake; - m->SleepSeqNum = 0; - m->SystemWakeOnLANEnabled = mDNSfalse; - m->AnnounceOwner = NonZeroTime(timenow + 60 * mDNSPlatformOneSecond); - m->DelaySleep = 0; - m->SleepLimit = 0; - - // These fields only required for mDNS Searcher... - m->Questions = mDNSNULL; - m->NewQuestions = mDNSNULL; - m->CurrentQuestion = mDNSNULL; - m->LocalOnlyQuestions = mDNSNULL; - m->NewLocalOnlyQuestions = mDNSNULL; - m->RestartQuestion = mDNSNULL; - m->rrcache_size = 0; - m->rrcache_totalused = 0; - m->rrcache_active = 0; - m->rrcache_report = 10; - m->rrcache_free = mDNSNULL; - - for (slot = 0; slot < CACHE_HASH_SLOTS; slot++) - { - m->rrcache_hash[slot] = mDNSNULL; - m->rrcache_nextcheck[slot] = timenow + 0x78000000;; - } - - mDNS_GrowCache_internal(m, rrcachestorage, rrcachesize); - m->rrauth.rrauth_free = mDNSNULL; - - for (slot = 0; slot < AUTH_HASH_SLOTS; slot++) - m->rrauth.rrauth_hash[slot] = mDNSNULL; - - // Fields below only required for mDNS Responder... - m->hostlabel.c[0] = 0; - m->nicelabel.c[0] = 0; - m->MulticastHostname.c[0] = 0; - m->HIHardware.c[0] = 0; - m->HISoftware.c[0] = 0; - m->ResourceRecords = mDNSNULL; - m->DuplicateRecords = mDNSNULL; - m->NewLocalRecords = mDNSNULL; - m->NewLocalOnlyRecords = mDNSfalse; - m->CurrentRecord = mDNSNULL; - m->HostInterfaces = mDNSNULL; - m->ProbeFailTime = 0; - m->NumFailedProbes = 0; - m->SuppressProbes = 0; - -#ifndef UNICAST_DISABLED - m->NextuDNSEvent = timenow + 0x78000000; - m->NextSRVUpdate = timenow + 0x78000000; - - m->DNSServers = mDNSNULL; - - m->Router = zeroAddr; - m->AdvertisedV4 = zeroAddr; - m->AdvertisedV6 = zeroAddr; - - m->AuthInfoList = mDNSNULL; - - m->ReverseMap.ThisQInterval = -1; - m->StaticHostname.c[0] = 0; - m->FQDN.c[0] = 0; - m->Hostnames = mDNSNULL; - m->AutoTunnelHostAddr.b[0] = 0; - m->AutoTunnelHostAddrActive = mDNSfalse; - m->AutoTunnelLabel.c[0] = 0; - - m->StartWABQueries = mDNSfalse; - m->RegisterAutoTunnel6 = mDNStrue; - - // NAT traversal fields - m->NATTraversals = mDNSNULL; - m->CurrentNATTraversal = mDNSNULL; - m->retryIntervalGetAddr = 0; // delta between time sent and retry - m->retryGetAddr = timenow + 0x78000000; // absolute time when we retry - m->ExternalAddress = zerov4Addr; - - m->NATMcastRecvskt = mDNSNULL; - m->LastNATupseconds = 0; - m->LastNATReplyLocalTime = timenow; - m->LastNATMapResultCode = NATErr_None; - - m->UPnPInterfaceID = 0; - m->SSDPSocket = mDNSNULL; - m->SSDPWANPPPConnection = mDNSfalse; - m->UPnPRouterPort = zeroIPPort; - m->UPnPSOAPPort = zeroIPPort; - m->UPnPRouterURL = mDNSNULL; - m->UPnPWANPPPConnection = mDNSfalse; - m->UPnPSOAPURL = mDNSNULL; - m->UPnPRouterAddressString = mDNSNULL; - m->UPnPSOAPAddressString = mDNSNULL; - m->SPSType = 0; - m->SPSPortability = 0; - m->SPSMarginalPower = 0; - m->SPSTotalPower = 0; - m->SPSState = 0; - m->SPSProxyListChanged = mDNSNULL; - m->SPSSocket = mDNSNULL; - m->SPSBrowseCallback = mDNSNULL; - m->ProxyRecords = 0; - -#endif - -#if APPLE_OSX_mDNSResponder - m->TunnelClients = mDNSNULL; - -#if ! NO_WCF - CHECK_WCF_FUNCTION(WCFConnectionNew) - { - m->WCF = WCFConnectionNew(); - if (!m->WCF) { LogMsg("WCFConnectionNew failed"); return -1; } - } -#endif - -#endif - - result = mDNSPlatformInit(m); - -#ifndef UNICAST_DISABLED - // It's better to do this *after* the platform layer has set up the - // interface list and security credentials - uDNS_SetupDNSConfig(m); // Get initial DNS configuration -#endif - - return(result); - } - -mDNSexport void mDNS_ConfigChanged(mDNS *const m) - { - if (m->SPSState == 1) - { - domainlabel name, newname; - domainname type, domain; - DeconstructServiceName(m->SPSRecords.RR_SRV.resrec.name, &name, &type, &domain); - ConstructSleepProxyServerName(m, &newname); - if (!SameDomainLabelCS(name.c, newname.c)) - { - LogSPS("Renaming SPS from '%#s' to '%#s'", name.c, newname.c); - // When SleepProxyServerCallback gets the mStatus_MemFree message, - // it will reregister the service under the new name - m->SPSState = 2; - mDNS_DeregisterService_drt(m, &m->SPSRecords, mDNS_Dereg_rapid); - } - } - - if (m->MainCallback) - m->MainCallback(m, mStatus_ConfigChanged); - } - -mDNSlocal void DynDNSHostNameCallback(mDNS *const m, AuthRecord *const rr, mStatus result) - { - (void)m; // unused - debugf("NameStatusCallback: result %d for registration of name %##s", result, rr->resrec.name->c); - mDNSPlatformDynDNSHostNameStatusChanged(rr->resrec.name, result); - } - -mDNSlocal void PurgeOrReconfirmCacheRecord(mDNS *const m, CacheRecord *cr, const DNSServer * const ptr, mDNSBool lameduck) - { - mDNSBool purge = cr->resrec.RecordType == kDNSRecordTypePacketNegative || - cr->resrec.rrtype == kDNSType_A || - cr->resrec.rrtype == kDNSType_AAAA || - cr->resrec.rrtype == kDNSType_SRV; - - (void) lameduck; - (void) ptr; - debugf("PurgeOrReconfirmCacheRecord: %s cache record due to %s server %p %#a:%d (%##s): %s", - purge ? "purging" : "reconfirming", - lameduck ? "lame duck" : "new", - ptr, &ptr->addr, mDNSVal16(ptr->port), ptr->domain.c, CRDisplayString(m, cr)); - - if (purge) - { - LogInfo("PurgeorReconfirmCacheRecord: Purging Resourcerecord %s, RecordType %x", CRDisplayString(m, cr), cr->resrec.RecordType); - mDNS_PurgeCacheResourceRecord(m, cr); - } - else - { - LogInfo("PurgeorReconfirmCacheRecord: Reconfirming Resourcerecord %s, RecordType %x", CRDisplayString(m, cr), cr->resrec.RecordType); - mDNS_Reconfirm_internal(m, cr, kDefaultReconfirmTimeForNoAnswer); - } - } - -mDNSlocal void mDNS_PurgeBeforeResolve(mDNS *const m, DNSQuestion *q) - { - const mDNSu32 slot = HashSlot(&q->qname); - CacheGroup *const cg = CacheGroupForName(m, slot, q->qnamehash, &q->qname); - CacheRecord *rp; - - for (rp = cg ? cg->members : mDNSNULL; rp; rp = rp->next) - { - if (SameNameRecordAnswersQuestion(&rp->resrec, q)) - { - LogInfo("mDNS_PurgeBeforeResolve: Flushing %s", CRDisplayString(m, rp)); - mDNS_PurgeCacheResourceRecord(m, rp); - } - } - } - -mDNSlocal void CacheRecordResetDNSServer(mDNS *const m, DNSQuestion *q, DNSServer *new) - { - const mDNSu32 slot = HashSlot(&q->qname); - CacheGroup *const cg = CacheGroupForName(m, slot, q->qnamehash, &q->qname); - CacheRecord *rp; - mDNSBool found = mDNSfalse; - mDNSBool foundNew = mDNSfalse; - DNSServer *old = q->qDNSServer; - mDNSBool newQuestion = IsQuestionNew(m, q); - DNSQuestion *qptr; - - // This function is called when the DNSServer is updated to the new question. There may already be - // some cache entries matching the old DNSServer and/or new DNSServer. There are four cases. In the - // following table, "Yes" denotes that a cache entry was found for old/new DNSServer. - // - // old DNSServer new DNSServer - // - // Case 1 Yes Yes - // Case 2 No Yes - // Case 3 Yes No - // Case 4 No No - // - // Case 1: There are cache entries for both old and new DNSServer. We handle this case by simply - // expiring the old Cache entries, deliver a RMV event (if an ADD event was delivered before) - // followed by the ADD event of the cache entries corresponding to the new server. This - // case happens when we pick a DNSServer, issue a query and get a valid response and create - // cache entries after which it stops responding. Another query (non-duplicate) picks a different - // DNSServer and creates identical cache entries (perhaps through records in Additional records). - // Now if the first one expires and tries to pick the new DNSServer (the original DNSServer - // is not responding) we will find cache entries corresponding to both DNSServers. - // - // Case 2: There are no cache entries for the old DNSServer but there are some for the new DNSServer. - // This means we should deliver an ADD event. Normally ADD events are delivered by - // AnswerNewQuestion if it is a new question. So, we check to see if it is a new question - // and if so, leave it to AnswerNewQuestion to deliver it. Otherwise, we use - // AnswerQuestionsForDNSServerChanges to deliver the ADD event. This case happens when a - // question picks a DNS server for which AnswerNewQuestion could not deliver an answer even - // though there were potential cache entries but DNSServer did not match. Now when we - // pick a new DNSServer, those cache entries may answer this question. - // - // Case 3: There are the cache entries for the old DNSServer but none for the new. We just move - // the old cache entries to point to the new DNSServer and the caller is expected to - // do a purge or reconfirm to delete or validate the RDATA. We don't need to do anything - // special for delivering ADD events, as it should have been done/will be done by - // AnswerNewQuestion. This case happens when we picked a DNSServer, sent the query and - // got a response and the cache is expired now and we are reissuing the question but the - // original DNSServer does not respond. - // - // Case 4: There are no cache entries either for the old or for the new DNSServer. There is nothing - // much we can do here. - // - // Case 2 and 3 are the most common while case 4 is possible when no DNSServers are working. Case 1 - // is relatively less likely to happen in practice - - // Temporarily set the DNSServer to look for the matching records for the new DNSServer. - q->qDNSServer = new; - for (rp = cg ? cg->members : mDNSNULL; rp; rp = rp->next) - { - if (SameNameRecordAnswersQuestion(&rp->resrec, q)) - { - LogInfo("CacheRecordResetDNSServer: Found cache record %##s for new DNSServer address: %#a", rp->resrec.name->c, - (rp->resrec.rDNSServer != mDNSNULL ? &rp->resrec.rDNSServer->addr : mDNSNULL)); - foundNew = mDNStrue; - break; - } - } - q->qDNSServer = old; - - for (rp = cg ? cg->members : mDNSNULL; rp; rp = rp->next) - { - if (SameNameRecordAnswersQuestion(&rp->resrec, q)) - { - // Case1 - found = mDNStrue; - if (foundNew) - { - LogInfo("CacheRecordResetDNSServer: Flushing Resourcerecord %##s, before:%#a, after:%#a", rp->resrec.name->c, - (rp->resrec.rDNSServer != mDNSNULL ? &rp->resrec.rDNSServer->addr : mDNSNULL), - (new != mDNSNULL ? &new->addr : mDNSNULL)); - mDNS_PurgeCacheResourceRecord(m, rp); - if (newQuestion) - { - // "q" is not a duplicate question. If it is a newQuestion, then the CRActiveQuestion can't be - // possibly set as it is set only when we deliver the ADD event to the question. - if (rp->CRActiveQuestion != mDNSNULL) - { - LogMsg("CacheRecordResetDNSServer: ERROR!!: CRActiveQuestion %p set, current question %p, name %##s", rp->CRActiveQuestion, q, q->qname.c); - rp->CRActiveQuestion = mDNSNULL; - } - // if this is a new question, then we never delivered an ADD yet, so don't deliver the RMV. - continue; - } - } - LogInfo("CacheRecordResetDNSServer: resetting cache record %##s DNSServer address before:%#a," - " after:%#a, CRActiveQuestion %p", rp->resrec.name->c, (rp->resrec.rDNSServer != mDNSNULL ? - &rp->resrec.rDNSServer->addr : mDNSNULL), (new != mDNSNULL ? &new->addr : mDNSNULL), - rp->CRActiveQuestion); - // Though we set it to the new DNS server, the caller is *assumed* to do either a purge - // or reconfirm or send out questions to the "new" server to verify whether the cached - // RDATA is valid - rp->resrec.rDNSServer = new; - } - } - - // Case 1 and Case 2 - if ((found && foundNew) || (!found && foundNew)) - { - if (newQuestion) - LogInfo("CacheRecordResetDNSServer: deliverAddEvents not set for question %p %##s (%s)", q, q->qname.c, DNSTypeName(q->qtype)); - else if (QuerySuppressed(q)) - LogInfo("CacheRecordResetDNSServer: deliverAddEvents not set for suppressed question %p %##s (%s)", q, q->qname.c, DNSTypeName(q->qtype)); - else - { - LogInfo("CacheRecordResetDNSServer: deliverAddEvents set for %p %##s (%s)", q, q->qname.c, DNSTypeName(q->qtype)); - q->deliverAddEvents = mDNStrue; - for (qptr = q->next; qptr; qptr = qptr->next) - if (qptr->DuplicateOf == q) qptr->deliverAddEvents = mDNStrue; - } - return; - } - - // Case 3 and Case 4 - return; - } - -mDNSexport void DNSServerChangeForQuestion(mDNS *const m, DNSQuestion *q, DNSServer *new) - { - DNSQuestion *qptr; - - // 1. Whenever we change the DNS server, we change the message identifier also so that response - // from the old server is not accepted as a response from the new server but only messages - // from the new server are accepted as valid responses. We do it irrespective of whether "new" - // is NULL or not. It is possible that we send two queries, no responses, pick a new DNS server - // which is NULL and now the response comes back and will try to penalize the DNS server which - // is NULL. By setting the messageID here, we will not accept that as a valid response. - - q->TargetQID = mDNS_NewMessageID(m); - - // 2. Move the old cache records to point them at the new DNSServer so that we can deliver the ADD/RMV events - // appropriately. At any point in time, we want all the cache records point only to one DNSServer for a given - // question. "DNSServer" here is the DNSServer object and not the DNS server itself. It is possible to - // have the same DNS server address in two objects, one scoped and another not scoped. But, the cache is per - // DNSServer object. By maintaining the question and the cache entries point to the same DNSServer - // always, the cache maintenance and delivery of ADD/RMV events becomes simpler. - // - // CacheRecordResetDNSServer should be called only once for the non-duplicate question as once the cache - // entries are moved to point to the new DNSServer, we don't need to call it for the duplicate question - // and it is wrong to call for the duplicate question as it's decision to mark deliverAddevents will be - // incorrect. - - if (q->DuplicateOf) - LogMsg("DNSServerChangeForQuestion: ERROR: Called for duplicate question %##s", q->qname.c); - else - CacheRecordResetDNSServer(m, q, new); - - // 3. Make sure all the duplicate questions point to the same DNSServer so that delivery - // of events for all of them are consistent. Duplicates for a question are always inserted - // after in the list. - q->qDNSServer = new; - for (qptr = q->next ; qptr; qptr = qptr->next) - { - if (qptr->DuplicateOf == q) { qptr->validDNSServers = q->validDNSServers; qptr->qDNSServer = new; } - } - } - -mDNSexport mStatus uDNS_SetupDNSConfig(mDNS *const m) - { - mDNSu32 slot; - CacheGroup *cg; - CacheRecord *cr; - - mDNSAddr v4, v6, r; - domainname fqdn; - DNSServer *ptr, **p = &m->DNSServers; - const DNSServer *oldServers = m->DNSServers; - DNSQuestion *q; - McastResolver *mr, **mres = &m->McastResolvers; - - debugf("uDNS_SetupDNSConfig: entry"); - - // Let the platform layer get the current DNS information - // The m->StartWABQueries is set when we get the first domain enumeration query (no need to hit the network - // with domain enumeration queries until we actually need that information). Even if it is not set, we still - // need to setup the search domains so that we can append them to queries that need them. - - uDNS_SetupSearchDomains(m, m->StartWABQueries ? UDNS_START_WAB_QUERY : 0); - - mDNS_Lock(m); - - for (ptr = m->DNSServers; ptr; ptr = ptr->next) - { - ptr->penaltyTime = 0; - ptr->flags |= DNSServer_FlagDelete; - } - - // We handle the mcast resolvers here itself as mDNSPlatformSetDNSConfig looks at - // mcast resolvers. Today we get both mcast and ucast configuration using the same - // API - for (mr = m->McastResolvers; mr; mr = mr->next) - mr->flags |= McastResolver_FlagDelete; - - mDNSPlatformSetDNSConfig(m, mDNStrue, mDNSfalse, &fqdn, mDNSNULL, mDNSNULL); - - // For now, we just delete the mcast resolvers. We don't deal with cache or - // questions here. Neither question nor cache point to mcast resolvers. Questions - // do inherit the timeout values from mcast resolvers. But we don't bother - // affecting them as they never change. - while (*mres) - { - if (((*mres)->flags & DNSServer_FlagDelete) != 0) - { - mr = *mres; - *mres = (*mres)->next; - debugf("uDNS_SetupDNSConfig: Deleting mcast resolver %##s", mr, mr->domain.c); - mDNSPlatformMemFree(mr); - } - else - { - (*mres)->flags &= ~McastResolver_FlagNew; - mres = &(*mres)->next; - } - } - - // Mark the records to be flushed that match a new resolver. We need to do this before - // we walk the questions below where we change the DNSServer pointer of the cache - // record - FORALL_CACHERECORDS(slot, cg, cr) - { - if (cr->resrec.InterfaceID) continue; - - // We just mark them for purge or reconfirm. We can't affect the DNSServer pointer - // here as the code below that calls CacheRecordResetDNSServer relies on this - // - // The new DNSServer may be a scoped or non-scoped one. We use the active question's - // InterfaceID for looking up the right DNS server - ptr = GetServerForName(m, cr->resrec.name, cr->CRActiveQuestion ? cr->CRActiveQuestion->InterfaceID : mDNSNULL); - - // Purge or Reconfirm if this cache entry would use the new DNS server - if (ptr && (ptr != cr->resrec.rDNSServer)) - { - // As the DNSServers for this cache record is not the same anymore, we don't - // want any new questions to pick this old value - if (cr->CRActiveQuestion == mDNSNULL) - { - LogInfo("uDNS_SetupDNSConfig: Purging Resourcerecord %s", CRDisplayString(m, cr)); - mDNS_PurgeCacheResourceRecord(m, cr); - } - else - { - LogInfo("uDNS_SetupDNSConfig: Purging/Reconfirming Resourcerecord %s", CRDisplayString(m, cr)); - PurgeOrReconfirmCacheRecord(m, cr, ptr, mDNSfalse); - } - } - } - // Update our qDNSServer pointers before we go and free the DNSServer object memory - for (q = m->Questions; q; q=q->next) - if (!mDNSOpaque16IsZero(q->TargetQID)) - { - DNSServer *s, *t; - DNSQuestion *qptr; - if (q->DuplicateOf) continue; - SetValidDNSServers(m, q); - q->triedAllServersOnce = 0; - s = GetServerForQuestion(m, q); - t = q->qDNSServer; - if (t != s) - { - // If DNS Server for this question has changed, reactivate it - debugf("uDNS_SetupDNSConfig: Updating DNS Server from %p %#a:%d (%##s) to %p %#a:%d (%##s) for %##s (%s)", - t, t ? &t->addr : mDNSNULL, mDNSVal16(t ? t->port : zeroIPPort), t ? t->domain.c : (mDNSu8*)"", - s, s ? &s->addr : mDNSNULL, mDNSVal16(s ? s->port : zeroIPPort), s ? s->domain.c : (mDNSu8*)"", - q->qname.c, DNSTypeName(q->qtype)); - - // After we reset the DNSServer pointer on the cache records here, three things could happen: - // - // 1) The query gets sent out and when the actual response comes back later it is possible - // that the response has the same RDATA, in which case we update our cache entry. - // If the response is different, then the entry will expire and a new entry gets added. - // For the latter case to generate a RMV followed by ADD events, we need to reset the DNS - // server here to match the question and the cache record. - // - // 2) We might have marked the cache entries for purge above and for us to be able to generate the RMV - // events for the questions, the DNSServer on the question should match the Cache Record - // - // 3) We might have marked the cache entries for reconfirm above, for which we send the query out which is - // the same as the first case above. - - DNSServerChangeForQuestion(m, q, s); - q->unansweredQueries = 0; - // We still need to pick a new DNSServer for the questions that have been - // suppressed, but it is wrong to activate the query as DNS server change - // could not possibly change the status of SuppressUnusable questions - if (!QuerySuppressed(q)) - { - debugf("uDNS_SetupDNSConfig: Activating query %p %##s (%s)", q, q->qname.c, DNSTypeName(q->qtype)); - ActivateUnicastQuery(m, q, mDNStrue); - // ActivateUnicastQuery is called for duplicate questions also as it does something - // special for AutoTunnel questions - for (qptr = q->next ; qptr; qptr = qptr->next) - { - if (qptr->DuplicateOf == q) ActivateUnicastQuery(m, qptr, mDNStrue); - } - } - } - else - { - debugf("uDNS_SetupDNSConfig: Not Updating DNS server question %p %##s (%s) DNS server %#a:%d %p %d", - q, q->qname.c, DNSTypeName(q->qtype), t ? &t->addr : mDNSNULL, mDNSVal16(t ? t->port : zeroIPPort), q->DuplicateOf, q->SuppressUnusable); - for (qptr = q->next ; qptr; qptr = qptr->next) - if (qptr->DuplicateOf == q) { qptr->validDNSServers = q->validDNSServers; qptr->qDNSServer = q->qDNSServer; } - } - } - - while (*p) - { - if (((*p)->flags & DNSServer_FlagDelete) != 0) - { - // Scan our cache, looking for uDNS records that we would have queried this server for. - // We reconfirm any records that match, because in this world of split DNS, firewalls, etc. - // different DNS servers can give different answers to the same question. - ptr = *p; - FORALL_CACHERECORDS(slot, cg, cr) - { - if (cr->resrec.InterfaceID) continue; - if (cr->resrec.rDNSServer == ptr) - { - // If we don't have an active question for this cache record, neither Purge can - // generate RMV events nor Reconfirm can send queries out. Just set the DNSServer - // pointer on the record NULL so that we don't point to freed memory (We might dereference - // DNSServer pointers from resource record for logging purposes). - // - // If there is an active question, point to its DNSServer as long as it does not point to the - // freed one. We already went through the questions above and made them point at either the - // new server or NULL if there is no server and also affected the cache entries that match - // this question. Hence, whenever we hit a resource record with a DNSServer that is just - // about to be deleted, we should never have an active question. The code below just tries to - // be careful logging messages if we ever hit this case. - - if (cr->CRActiveQuestion) - { - DNSQuestion *qptr = cr->CRActiveQuestion; - if (qptr->qDNSServer == mDNSNULL) - LogMsg("uDNS_SetupDNSConfig: Cache Record %s match: Active question %##s (%s) with DNSServer Address NULL, Server to be deleted %#a", - CRDisplayString(m, cr), qptr->qname.c, DNSTypeName(qptr->qtype), &ptr->addr); - else - LogMsg("uDNS_SetupDNSConfig: Cache Record %s match: Active question %##s (%s) DNSServer Address %#a, Server to be deleted %#a", - CRDisplayString(m, cr), qptr->qname.c, DNSTypeName(qptr->qtype), &qptr->qDNSServer->addr, &ptr->addr); - - if (qptr->qDNSServer == ptr) - { - qptr->validDNSServers = zeroOpaque64; - qptr->qDNSServer = mDNSNULL; - cr->resrec.rDNSServer = mDNSNULL; - } - else - { - cr->resrec.rDNSServer = qptr->qDNSServer; - } - } - else - { - LogInfo("uDNS_SetupDNSConfig: Cache Record %##s has no Active question, Record's DNSServer Address %#a, Server to be deleted %#a", - cr->resrec.name, &cr->resrec.rDNSServer->addr, &ptr->addr); - cr->resrec.rDNSServer = mDNSNULL; - } - - PurgeOrReconfirmCacheRecord(m, cr, ptr, mDNStrue); - } - } - *p = (*p)->next; - debugf("uDNS_SetupDNSConfig: Deleting server %p %#a:%d (%##s)", ptr, &ptr->addr, mDNSVal16(ptr->port), ptr->domain.c); - mDNSPlatformMemFree(ptr); - NumUnicastDNSServers--; - } - else - { - (*p)->flags &= ~DNSServer_FlagNew; - p = &(*p)->next; - } - } - - // If we now have no DNS servers at all and we used to have some, then immediately purge all unicast cache records (including for LLQs). - // This is important for giving prompt remove events when the user disconnects the Ethernet cable or turns off wireless. - // Otherwise, stale data lingers for 5-10 seconds, which is not the user-experience people expect from Bonjour. - // Similarly, if we now have some DNS servers and we used to have none, we want to purge any fake negative results we may have generated. - if ((m->DNSServers != mDNSNULL) != (oldServers != mDNSNULL)) - { - int count = 0; - FORALL_CACHERECORDS(slot, cg, cr) if (!cr->resrec.InterfaceID) { mDNS_PurgeCacheResourceRecord(m, cr); count++; } - LogInfo("uDNS_SetupDNSConfig: %s available; purged %d unicast DNS records from cache", - m->DNSServers ? "DNS server became" : "No DNS servers", count); - - // Force anything that needs to get zone data to get that information again - RestartRecordGetZoneData(m); - } - - // Did our FQDN change? - if (!SameDomainName(&fqdn, &m->FQDN)) - { - if (m->FQDN.c[0]) mDNS_RemoveDynDNSHostName(m, &m->FQDN); - - AssignDomainName(&m->FQDN, &fqdn); - - if (m->FQDN.c[0]) - { - mDNSPlatformDynDNSHostNameStatusChanged(&m->FQDN, 1); - mDNS_AddDynDNSHostName(m, &m->FQDN, DynDNSHostNameCallback, mDNSNULL); - } - } - - mDNS_Unlock(m); - - // handle router and primary interface changes - v4 = v6 = r = zeroAddr; - v4.type = r.type = mDNSAddrType_IPv4; - - if (mDNSPlatformGetPrimaryInterface(m, &v4, &v6, &r) == mStatus_NoError && !mDNSv4AddressIsLinkLocal(&v4.ip.v4)) - { - mDNS_SetPrimaryInterfaceInfo(m, - !mDNSIPv4AddressIsZero(v4.ip.v4) ? &v4 : mDNSNULL, - !mDNSIPv6AddressIsZero(v6.ip.v6) ? &v6 : mDNSNULL, - !mDNSIPv4AddressIsZero(r .ip.v4) ? &r : mDNSNULL); - } - else - { - mDNS_SetPrimaryInterfaceInfo(m, mDNSNULL, mDNSNULL, mDNSNULL); - if (m->FQDN.c[0]) mDNSPlatformDynDNSHostNameStatusChanged(&m->FQDN, 1); // Set status to 1 to indicate temporary failure - } - - debugf("uDNS_SetupDNSConfig: number of unicast DNS servers %d", NumUnicastDNSServers); - return mStatus_NoError; - } - -mDNSexport void mDNSCoreInitComplete(mDNS *const m, mStatus result) - { - m->mDNSPlatformStatus = result; - if (m->MainCallback) - { - mDNS_Lock(m); - mDNS_DropLockBeforeCallback(); // Allow client to legally make mDNS API calls from the callback - m->MainCallback(m, mStatus_NoError); - mDNS_ReclaimLockAfterCallback(); // Decrement mDNS_reentrancy to block mDNS API calls again - mDNS_Unlock(m); - } - } - -mDNSlocal void DeregLoop(mDNS *const m, AuthRecord *const start) - { - m->CurrentRecord = start; - while (m->CurrentRecord) - { - AuthRecord *rr = m->CurrentRecord; - LogInfo("DeregLoop: %s deregistration for %p %02X %s", - (rr->resrec.RecordType != kDNSRecordTypeDeregistering) ? "Initiating " : "Accelerating", - rr, rr->resrec.RecordType, ARDisplayString(m, rr)); - if (rr->resrec.RecordType != kDNSRecordTypeDeregistering) - mDNS_Deregister_internal(m, rr, mDNS_Dereg_rapid); - else if (rr->AnnounceCount > 1) - { - rr->AnnounceCount = 1; - rr->LastAPTime = m->timenow - rr->ThisAPInterval; - } - // Mustn't advance m->CurrentRecord until *after* mDNS_Deregister_internal, because - // new records could have been added to the end of the list as a result of that call. - if (m->CurrentRecord == rr) // If m->CurrentRecord was not advanced for us, do it now - m->CurrentRecord = rr->next; - } - } - -mDNSexport void mDNS_StartExit(mDNS *const m) - { - NetworkInterfaceInfo *intf; - AuthRecord *rr; - - mDNS_Lock(m); - - LogInfo("mDNS_StartExit"); - m->ShutdownTime = NonZeroTime(m->timenow + mDNSPlatformOneSecond * 5); - - mDNSCoreBeSleepProxyServer_internal(m, 0, 0, 0, 0); - -#if APPLE_OSX_mDNSResponder -#if ! NO_WCF - CHECK_WCF_FUNCTION(WCFConnectionDealloc) - { - if (m->WCF) WCFConnectionDealloc((WCFConnection *)m->WCF); - } -#endif -#endif - -#ifndef UNICAST_DISABLED - { - SearchListElem *s; - SuspendLLQs(m); - // Don't need to do SleepRecordRegistrations() here - // because we deregister all records and services later in this routine - while (m->Hostnames) mDNS_RemoveDynDNSHostName(m, &m->Hostnames->fqdn); - - // For each member of our SearchList, deregister any records it may have created, and cut them from the list. - // Otherwise they'll be forcibly deregistered for us (without being cut them from the appropriate list) - // and we may crash because the list still contains dangling pointers. - for (s = SearchList; s; s = s->next) - while (s->AuthRecs) - { - ARListElem *dereg = s->AuthRecs; - s->AuthRecs = s->AuthRecs->next; - mDNS_Deregister_internal(m, &dereg->ar, mDNS_Dereg_normal); // Memory will be freed in the FreeARElemCallback - } - } -#endif - - for (intf = m->HostInterfaces; intf; intf = intf->next) - if (intf->Advertise) - DeadvertiseInterface(m, intf); - - // Shut down all our active NAT Traversals - while (m->NATTraversals) - { - NATTraversalInfo *t = m->NATTraversals; - mDNS_StopNATOperation_internal(m, t); // This will cut 't' from the list, thereby advancing m->NATTraversals in the process - - // After stopping the NAT Traversal, we zero out the fields. - // This has particularly important implications for our AutoTunnel records -- - // when we deregister our AutoTunnel records below, we don't want their mStatus_MemFree - // handlers to just turn around and attempt to re-register those same records. - // Clearing t->ExternalPort/t->RequestedPort will cause the mStatus_MemFree callback handlers - // to not do this. - t->ExternalAddress = zerov4Addr; - t->ExternalPort = zeroIPPort; - t->RequestedPort = zeroIPPort; - t->Lifetime = 0; - t->Result = mStatus_NoError; - } - - // Make sure there are nothing but deregistering records remaining in the list - if (m->CurrentRecord) - LogMsg("mDNS_StartExit: ERROR m->CurrentRecord already set %s", ARDisplayString(m, m->CurrentRecord)); - - // We're in the process of shutting down, so queries, etc. are no longer available. - // Consequently, determining certain information, e.g. the uDNS update server's IP - // address, will not be possible. The records on the main list are more likely to - // already contain such information, so we deregister the duplicate records first. - LogInfo("mDNS_StartExit: Deregistering duplicate resource records"); - DeregLoop(m, m->DuplicateRecords); - LogInfo("mDNS_StartExit: Deregistering resource records"); - DeregLoop(m, m->ResourceRecords); - - // If we scheduled a response to send goodbye packets, we set NextScheduledResponse to now. Normally when deregistering records, - // we allow up to 100ms delay (to help improve record grouping) but when shutting down we don't want any such delay. - if (m->NextScheduledResponse - m->timenow < mDNSPlatformOneSecond) - { - m->NextScheduledResponse = m->timenow; - m->SuppressSending = 0; - } - - if (m->ResourceRecords) LogInfo("mDNS_StartExit: Sending final record deregistrations"); - else LogInfo("mDNS_StartExit: No deregistering records remain"); - - for (rr = m->DuplicateRecords; rr; rr = rr->next) - LogMsg("mDNS_StartExit: Should not still have Duplicate Records remaining: %02X %s", rr->resrec.RecordType, ARDisplayString(m, rr)); - - // If any deregistering records remain, send their deregistration announcements before we exit - if (m->mDNSPlatformStatus != mStatus_NoError) DiscardDeregistrations(m); - - mDNS_Unlock(m); - - LogInfo("mDNS_StartExit: done"); - } - -mDNSexport void mDNS_FinalExit(mDNS *const m) - { - mDNSu32 rrcache_active = 0; - mDNSu32 rrcache_totalused = 0; - mDNSu32 slot; - AuthRecord *rr; - - LogInfo("mDNS_FinalExit: mDNSPlatformClose"); - mDNSPlatformClose(m); - - rrcache_totalused = m->rrcache_totalused; - for (slot = 0; slot < CACHE_HASH_SLOTS; slot++) - { - while (m->rrcache_hash[slot]) - { - CacheGroup *cg = m->rrcache_hash[slot]; - while (cg->members) - { - CacheRecord *cr = cg->members; - cg->members = cg->members->next; - if (cr->CRActiveQuestion) rrcache_active++; - ReleaseCacheRecord(m, cr); - } - cg->rrcache_tail = &cg->members; - ReleaseCacheGroup(m, &m->rrcache_hash[slot]); - } - } - debugf("mDNS_FinalExit: RR Cache was using %ld records, %lu active", rrcache_totalused, rrcache_active); - if (rrcache_active != m->rrcache_active) - LogMsg("*** ERROR *** rrcache_active %lu != m->rrcache_active %lu", rrcache_active, m->rrcache_active); - - for (rr = m->ResourceRecords; rr; rr = rr->next) - LogMsg("mDNS_FinalExit failed to send goodbye for: %p %02X %s", rr, rr->resrec.RecordType, ARDisplayString(m, rr)); - - LogInfo("mDNS_FinalExit: done"); - } diff --git a/src/tools/mdnssd/mDNSDebug.c b/src/tools/mdnssd/mDNSDebug.c deleted file mode 100644 index f111a5dd7b..0000000000 --- a/src/tools/mdnssd/mDNSDebug.c +++ /dev/null @@ -1,93 +0,0 @@ -/* -*- Mode: C; tab-width: 4 -*- - * - * Copyright (c) 2003 Apple Computer, Inc. All rights reserved. - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - - File: mDNSDebug.c - - Contains: Implementation of debugging utilities. Requires a POSIX environment. - - Version: 1.0 - - */ - -#include "mDNSDebug.h" - -#include - -#if defined(WIN32) || defined(EFI32) || defined(EFI64) || defined(EFIX64) -// Need to add Windows/EFI syslog support here -#define LOG_PID 0x01 -#define LOG_CONS 0x02 -#define LOG_PERROR 0x20 -#else -#include -#endif - -#include "mDNSEmbeddedAPI.h" - -mDNSexport int mDNS_LoggingEnabled = 0; -mDNSexport int mDNS_PacketLoggingEnabled = 0; - -#if MDNS_DEBUGMSGS -mDNSexport int mDNS_DebugMode = mDNStrue; -#else -mDNSexport int mDNS_DebugMode = mDNSfalse; -#endif - -// Note, this uses mDNS_vsnprintf instead of standard "vsnprintf", because mDNS_vsnprintf knows -// how to print special data types like IP addresses and length-prefixed domain names -#if MDNS_DEBUGMSGS > 1 -mDNSexport void verbosedebugf_(const char *format, ...) - { - char buffer[512]; - va_list ptr; - va_start(ptr,format); - buffer[mDNS_vsnprintf(buffer, sizeof(buffer), format, ptr)] = 0; - va_end(ptr); - mDNSPlatformWriteDebugMsg(buffer); - } -#endif - -// Log message with default "mDNSResponder" ident string at the start -mDNSlocal void LogMsgWithLevelv(mDNSLogLevel_t logLevel, const char *format, va_list ptr) - { - char buffer[512]; - buffer[mDNS_vsnprintf((char *)buffer, sizeof(buffer), format, ptr)] = 0; - mDNSPlatformWriteLogMsg(ProgramName, buffer, logLevel); - } - -#define LOG_HELPER_BODY(L) \ - { \ - va_list ptr; \ - va_start(ptr,format); \ - LogMsgWithLevelv(L, format, ptr); \ - va_end(ptr); \ - } - -// see mDNSDebug.h -#if !MDNS_HAS_VA_ARG_MACROS -void LogMsg_(const char *format, ...) LOG_HELPER_BODY(MDNS_LOG_MSG) -void LogOperation_(const char *format, ...) LOG_HELPER_BODY(MDNS_LOG_OPERATION) -void LogSPS_(const char *format, ...) LOG_HELPER_BODY(MDNS_LOG_SPS) -void LogInfo_(const char *format, ...) LOG_HELPER_BODY(MDNS_LOG_INFO) -#endif - -#if MDNS_DEBUGMSGS -void debugf_(const char *format, ...) LOG_HELPER_BODY(MDNS_LOG_DEBUG) -#endif - -// Log message with default "mDNSResponder" ident string at the start -mDNSexport void LogMsgWithLevel(mDNSLogLevel_t logLevel, const char *format, ...) - LOG_HELPER_BODY(logLevel) diff --git a/src/tools/mdnssd/mDNSDebug.h b/src/tools/mdnssd/mDNSDebug.h deleted file mode 100755 index 07647b52d4..0000000000 --- a/src/tools/mdnssd/mDNSDebug.h +++ /dev/null @@ -1,164 +0,0 @@ -/* -*- Mode: C; tab-width: 4 -*- - * - * Copyright (c) 2002-2003 Apple Computer, Inc. All rights reserved. - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -#ifndef __mDNSDebug_h -#define __mDNSDebug_h - -// Set MDNS_DEBUGMSGS to 0 to optimize debugf() calls out of the compiled code -// Set MDNS_DEBUGMSGS to 1 to generate normal debugging messages -// Set MDNS_DEBUGMSGS to 2 to generate verbose debugging messages -// MDNS_DEBUGMSGS is normally set in the project options (or makefile) but can also be set here if desired -// (If you edit the file here to turn on MDNS_DEBUGMSGS while you're debugging some code, be careful -// not to accidentally check-in that change by mistake when you check in your other changes.) - -//#undef MDNS_DEBUGMSGS -//#define MDNS_DEBUGMSGS 2 - -// Set MDNS_CHECK_PRINTF_STYLE_FUNCTIONS to 1 to enable extra GCC compiler warnings -// Note: You don't normally want to do this, because it generates a bunch of -// spurious warnings for the following custom extensions implemented by mDNS_vsnprintf: -// warning: `#' flag used with `%s' printf format (for %#s -- pascal string format) -// warning: repeated `#' flag in format (for %##s -- DNS name string format) -// warning: double format, pointer arg (arg 2) (for %.4a, %.16a, %#a -- IP address formats) -#define MDNS_CHECK_PRINTF_STYLE_FUNCTIONS 0 - -typedef enum - { - MDNS_LOG_MSG, - MDNS_LOG_OPERATION, - MDNS_LOG_SPS, - MDNS_LOG_INFO, - MDNS_LOG_DEBUG, - } mDNSLogLevel_t; - -// Set this symbol to 1 to answer remote queries for our Address, reverse mapping PTR, and HINFO records -#define ANSWER_REMOTE_HOSTNAME_QUERIES 0 - -// Set this symbol to 1 to do extra debug checks on malloc() and free() -// Set this symbol to 2 to write a log message for every malloc() and free() -//#define MACOSX_MDNS_MALLOC_DEBUGGING 1 - -//#define ForceAlerts 1 -//#define LogTimeStamps 1 - -// Developer-settings section ends here - -#if MDNS_CHECK_PRINTF_STYLE_FUNCTIONS -#define IS_A_PRINTF_STYLE_FUNCTION(F,A) __attribute__ ((format(printf,F,A))) -#else -#define IS_A_PRINTF_STYLE_FUNCTION(F,A) -#endif - -#ifdef __cplusplus - extern "C" { -#endif - -// Variable argument macro support. Use ANSI C99 __VA_ARGS__ where possible. Otherwise, use the next best thing. - -#if (defined(__GNUC__)) - #if ((__GNUC__ > 3) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 2))) - #define MDNS_C99_VA_ARGS 1 - #define MDNS_GNU_VA_ARGS 0 - #else - #define MDNS_C99_VA_ARGS 0 - #define MDNS_GNU_VA_ARGS 1 - #endif - #define MDNS_HAS_VA_ARG_MACROS 1 -#elif (_MSC_VER >= 1400) // Visual Studio 2005 and later - #define MDNS_C99_VA_ARGS 1 - #define MDNS_GNU_VA_ARGS 0 - #define MDNS_HAS_VA_ARG_MACROS 1 -#elif (defined(__MWERKS__)) - #define MDNS_C99_VA_ARGS 1 - #define MDNS_GNU_VA_ARGS 0 - #define MDNS_HAS_VA_ARG_MACROS 1 -#else - #define MDNS_C99_VA_ARGS 0 - #define MDNS_GNU_VA_ARGS 0 - #define MDNS_HAS_VA_ARG_MACROS 0 -#endif - -#if (MDNS_HAS_VA_ARG_MACROS) - #if (MDNS_C99_VA_ARGS) - #define debug_noop( ... ) ((void)0) - #define LogMsg( ... ) LogMsgWithLevel(MDNS_LOG_MSG, __VA_ARGS__) - #define LogOperation( ... ) do { if (mDNS_LoggingEnabled) LogMsgWithLevel(MDNS_LOG_OPERATION, __VA_ARGS__); } while (0) - #define LogSPS( ... ) do { if (mDNS_LoggingEnabled) LogMsgWithLevel(MDNS_LOG_SPS, __VA_ARGS__); } while (0) - #define LogInfo( ... ) do { if (mDNS_LoggingEnabled) LogMsgWithLevel(MDNS_LOG_INFO, __VA_ARGS__); } while (0) - #elif (MDNS_GNU_VA_ARGS) - #define debug_noop( ARGS... ) ((void)0) - #define LogMsg( ARGS... ) LogMsgWithLevel(MDNS_LOG_MSG, ARGS) - #define LogOperation( ARGS... ) do { if (mDNS_LoggingEnabled) LogMsgWithLevel(MDNS_LOG_OPERATION, ARGS); } while (0) - #define LogSPS( ARGS... ) do { if (mDNS_LoggingEnabled) LogMsgWithLevel(MDNS_LOG_SPS, ARGS); } while (0) - #define LogInfo( ARGS... ) do { if (mDNS_LoggingEnabled) LogMsgWithLevel(MDNS_LOG_INFO, ARGS); } while (0) - #else - #error Unknown variadic macros - #endif -#else - // If your platform does not support variadic macros, you need to define the following variadic functions. - // See mDNSShared/mDNSDebug.c for sample implementation - #define debug_noop 1 ? (void)0 : (void) - #define LogMsg LogMsg_ - #define LogOperation (mDNS_LoggingEnabled == 0) ? ((void)0) : LogOperation_ - #define LogSPS (mDNS_LoggingEnabled == 0) ? ((void)0) : LogSPS_ - #define LogInfo (mDNS_LoggingEnabled == 0) ? ((void)0) : LogInfo_ - extern void LogMsg_(const char *format, ...) IS_A_PRINTF_STYLE_FUNCTION(1,2); - extern void LogOperation_(const char *format, ...) IS_A_PRINTF_STYLE_FUNCTION(1,2); - extern void LogSPS_(const char *format, ...) IS_A_PRINTF_STYLE_FUNCTION(1,2); - extern void LogInfo_(const char *format, ...) IS_A_PRINTF_STYLE_FUNCTION(1,2); -#endif - -#if MDNS_DEBUGMSGS -#define debugf debugf_ -extern void debugf_(const char *format, ...) IS_A_PRINTF_STYLE_FUNCTION(1,2); -#else -#define debugf debug_noop -#endif - -#if MDNS_DEBUGMSGS > 1 -#define verbosedebugf verbosedebugf_ -extern void verbosedebugf_(const char *format, ...) IS_A_PRINTF_STYLE_FUNCTION(1,2); -#else -#define verbosedebugf debug_noop -#endif - -extern int mDNS_LoggingEnabled; -extern int mDNS_PacketLoggingEnabled; -extern int mDNS_DebugMode; // If non-zero, LogMsg() writes to stderr instead of syslog -extern const char ProgramName[]; - -extern void LogMsgWithLevel(mDNSLogLevel_t logLevel, const char *format, ...) IS_A_PRINTF_STYLE_FUNCTION(2,3); -// LogMsgNoIdent needs to be fixed so that it logs without the ident prefix like it used to -// (or completely overhauled to use the new "log to a separate file" facility) -#define LogMsgNoIdent LogMsg - -#if APPLE_OSX_mDNSResponder && MACOSX_MDNS_MALLOC_DEBUGGING >= 1 -extern void *mallocL(char *msg, unsigned int size); -extern void freeL(char *msg, void *x); -extern void LogMemCorruption(const char *format, ...); -extern void uds_validatelists(void); -extern void udns_validatelists(void *const v); -#else -#define mallocL(X,Y) malloc(Y) -#define freeL(X,Y) free(Y) -#endif - -#ifdef __cplusplus - } -#endif - -#endif diff --git a/src/tools/mdnssd/mDNSEmbeddedAPI.h b/src/tools/mdnssd/mDNSEmbeddedAPI.h deleted file mode 100755 index 7310dc56e3..0000000000 --- a/src/tools/mdnssd/mDNSEmbeddedAPI.h +++ /dev/null @@ -1,2964 +0,0 @@ -/* -*- Mode: C; tab-width: 4 -*- - * - * Copyright (c) 2002-2003 Apple Computer, Inc. All rights reserved. - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - - NOTE: - If you're building an application that uses DNS Service Discovery - this is probably NOT the header file you're looking for. - In most cases you will want to use /usr/include/dns_sd.h instead. - - This header file defines the lowest level raw interface to mDNSCore, - which is appropriate *only* on tiny embedded systems where everything - runs in a single address space and memory is extremely constrained. - All the APIs here are malloc-free, which means that the caller is - responsible for passing in a pointer to the relevant storage that - will be used in the execution of that call, and (when called with - correct parameters) all the calls are guaranteed to succeed. There - is never a case where a call can suffer intermittent failures because - the implementation calls malloc() and sometimes malloc() returns NULL - because memory is so limited that no more is available. - This is primarily for devices that need to have precisely known fixed - memory requirements, with absolutely no uncertainty or run-time variation, - but that certainty comes at a cost of more difficult programming. - - For applications running on general-purpose desktop operating systems - (Mac OS, Linux, Solaris, Windows, etc.) the API you should use is - /usr/include/dns_sd.h, which defines the API by which multiple - independent client processes communicate their DNS Service Discovery - requests to a single "mdnsd" daemon running in the background. - - Even on platforms that don't run multiple independent processes in - multiple independent address spaces, you can still use the preferred - dns_sd.h APIs by linking in "dnssd_clientshim.c", which implements - the standard "dns_sd.h" API calls, allocates any required storage - using malloc(), and then calls through to the low-level malloc-free - mDNSCore routines defined here. This has the benefit that even though - you're running on a small embedded system with a single address space, - you can still use the exact same client C code as you'd use on a - general-purpose desktop system. - - */ - -#ifndef __mDNSClientAPI_h -#define __mDNSClientAPI_h - -#if defined(EFI32) || defined(EFI64) || defined(EFIX64) -// EFI doesn't have stdarg.h unless it's building with GCC. -#include "Tiano.h" -#if !defined(__GNUC__) -#define va_list VA_LIST -#define va_start(a, b) VA_START(a, b) -#define va_end(a) VA_END(a) -#define va_arg(a, b) VA_ARG(a, b) -#endif -#else -#include // stdarg.h is required for for va_list support for the mDNS_vsnprintf declaration -#endif - -#include "mDNSDebug.h" -#if APPLE_OSX_mDNSResponder -#include -#endif - -#ifdef __cplusplus - extern "C" { -#endif - -// *************************************************************************** -// Function scope indicators - -// If you see "mDNSlocal" before a function name in a C file, it means the function is not callable outside this file -#ifndef mDNSlocal -#define mDNSlocal static -#endif -// If you see "mDNSexport" before a symbol in a C file, it means the symbol is exported for use by clients -// For every "mDNSexport" in a C file, there needs to be a corresponding "extern" declaration in some header file -// (When a C file #includes a header file, the "extern" declarations tell the compiler: -// "This symbol exists -- but not necessarily in this C file.") -#ifndef mDNSexport -#define mDNSexport -#endif - -// Explanation: These local/export markers are a little habit of mine for signaling the programmers' intentions. -// When "mDNSlocal" is just a synonym for "static", and "mDNSexport" is a complete no-op, you could be -// forgiven for asking what purpose they serve. The idea is that if you see "mDNSexport" in front of a -// function definition it means the programmer intended it to be exported and callable from other files -// in the project. If you see "mDNSlocal" in front of a function definition it means the programmer -// intended it to be private to that file. If you see neither in front of a function definition it -// means the programmer forgot (so you should work out which it is supposed to be, and fix it). -// Using "mDNSlocal" instead of "static" makes it easier to do a textual searches for one or the other. -// For example you can do a search for "static" to find if any functions declare any local variables as "static" -// (generally a bad idea unless it's also "const", because static storage usually risks being non-thread-safe) -// without the results being cluttered with hundreds of matches for functions declared static. -// - Stuart Cheshire - -// *************************************************************************** -// Structure packing macro - -// If we're not using GNUC, it's not fatal. -// Most compilers naturally pack the on-the-wire structures correctly anyway, so a plain "struct" is usually fine. -// In the event that structures are not packed correctly, mDNS_Init() will detect this and report an error, so the -// developer will know what's wrong, and can investigate what needs to be done on that compiler to provide proper packing. -#ifndef packedstruct - #if ((__GNUC__ > 2) || ((__GNUC__ == 2) && (__GNUC_MINOR__ >= 9))) - #define packedstruct struct __attribute__((__packed__)) - #define packedunion union __attribute__((__packed__)) - #else - #define packedstruct struct - #define packedunion union - #endif -#endif - -// *************************************************************************** -#if 0 -#pragma mark - DNS Resource Record class and type constants -#endif - -typedef enum // From RFC 1035 - { - kDNSClass_IN = 1, // Internet - kDNSClass_CS = 2, // CSNET - kDNSClass_CH = 3, // CHAOS - kDNSClass_HS = 4, // Hesiod - kDNSClass_NONE = 254, // Used in DNS UPDATE [RFC 2136] - - kDNSClass_Mask = 0x7FFF,// Multicast DNS uses the bottom 15 bits to identify the record class... - kDNSClass_UniqueRRSet = 0x8000,// ... and the top bit indicates that all other cached records are now invalid - - kDNSQClass_ANY = 255, // Not a DNS class, but a DNS query class, meaning "all classes" - kDNSQClass_UnicastResponse = 0x8000 // Top bit set in a question means "unicast response acceptable" - } DNS_ClassValues; - -typedef enum // From RFC 1035 - { - kDNSType_A = 1, // 1 Address - kDNSType_NS, // 2 Name Server - kDNSType_MD, // 3 Mail Destination - kDNSType_MF, // 4 Mail Forwarder - kDNSType_CNAME, // 5 Canonical Name - kDNSType_SOA, // 6 Start of Authority - kDNSType_MB, // 7 Mailbox - kDNSType_MG, // 8 Mail Group - kDNSType_MR, // 9 Mail Rename - kDNSType_NULL, // 10 NULL RR - kDNSType_WKS, // 11 Well-known-service - kDNSType_PTR, // 12 Domain name pointer - kDNSType_HINFO, // 13 Host information - kDNSType_MINFO, // 14 Mailbox information - kDNSType_MX, // 15 Mail Exchanger - kDNSType_TXT, // 16 Arbitrary text string - kDNSType_RP, // 17 Responsible person - kDNSType_AFSDB, // 18 AFS cell database - kDNSType_X25, // 19 X_25 calling address - kDNSType_ISDN, // 20 ISDN calling address - kDNSType_RT, // 21 Router - kDNSType_NSAP, // 22 NSAP address - kDNSType_NSAP_PTR, // 23 Reverse NSAP lookup (deprecated) - kDNSType_SIG, // 24 Security signature - kDNSType_KEY, // 25 Security key - kDNSType_PX, // 26 X.400 mail mapping - kDNSType_GPOS, // 27 Geographical position (withdrawn) - kDNSType_AAAA, // 28 IPv6 Address - kDNSType_LOC, // 29 Location Information - kDNSType_NXT, // 30 Next domain (security) - kDNSType_EID, // 31 Endpoint identifier - kDNSType_NIMLOC, // 32 Nimrod Locator - kDNSType_SRV, // 33 Service record - kDNSType_ATMA, // 34 ATM Address - kDNSType_NAPTR, // 35 Naming Authority PoinTeR - kDNSType_KX, // 36 Key Exchange - kDNSType_CERT, // 37 Certification record - kDNSType_A6, // 38 IPv6 Address (deprecated) - kDNSType_DNAME, // 39 Non-terminal DNAME (for IPv6) - kDNSType_SINK, // 40 Kitchen sink (experimental) - kDNSType_OPT, // 41 EDNS0 option (meta-RR) - kDNSType_APL, // 42 Address Prefix List - kDNSType_DS, // 43 Delegation Signer - kDNSType_SSHFP, // 44 SSH Key Fingerprint - kDNSType_IPSECKEY, // 45 IPSECKEY - kDNSType_RRSIG, // 46 RRSIG - kDNSType_NSEC, // 47 Denial of Existence - kDNSType_DNSKEY, // 48 DNSKEY - kDNSType_DHCID, // 49 DHCP Client Identifier - kDNSType_NSEC3, // 50 Hashed Authenticated Denial of Existence - kDNSType_NSEC3PARAM, // 51 Hashed Authenticated Denial of Existence - - kDNSType_HIP = 55, // 55 Host Identity Protocol - - kDNSType_SPF = 99, // 99 Sender Policy Framework for E-Mail - kDNSType_UINFO, // 100 IANA-Reserved - kDNSType_UID, // 101 IANA-Reserved - kDNSType_GID, // 102 IANA-Reserved - kDNSType_UNSPEC, // 103 IANA-Reserved - - kDNSType_TKEY = 249, // 249 Transaction key - kDNSType_TSIG, // 250 Transaction signature - kDNSType_IXFR, // 251 Incremental zone transfer - kDNSType_AXFR, // 252 Transfer zone of authority - kDNSType_MAILB, // 253 Transfer mailbox records - kDNSType_MAILA, // 254 Transfer mail agent records - kDNSQType_ANY // Not a DNS type, but a DNS query type, meaning "all types" - } DNS_TypeValues; - -// *************************************************************************** -#if 0 -#pragma mark - -#pragma mark - Simple types -#endif - -// mDNS defines its own names for these common types to simplify portability across -// multiple platforms that may each have their own (different) names for these types. -typedef int mDNSBool; -typedef signed char mDNSs8; -typedef unsigned char mDNSu8; -typedef signed short mDNSs16; -typedef unsigned short mDNSu16; - -// says -// __LP64__ _LP64 -// These macros are defined, with value 1, if (and only if) the compilation is -// for a target where long int and pointer both use 64-bits and int uses 32-bit. -// says -// Macro Name __LP64__ Value 1 -// A quick Google search for "defined(__LP64__)" OR "#ifdef __LP64__" gives 2590 hits and -// a search for "#if __LP64__" gives only 12, so I think we'll go with the majority and use defined() -#if defined(_ILP64) || defined(__ILP64__) -typedef signed int32 mDNSs32; -typedef unsigned int32 mDNSu32; -#elif defined(_LP64) || defined(__LP64__) -typedef signed int mDNSs32; -typedef unsigned int mDNSu32; -#else -typedef signed long mDNSs32; -typedef unsigned long mDNSu32; -//typedef signed int mDNSs32; -//typedef unsigned int mDNSu32; -#endif - -// To enforce useful type checking, we make mDNSInterfaceID be a pointer to a dummy struct -// This way, mDNSInterfaceIDs can be assigned, and compared with each other, but not with other types -// Declaring the type to be the typical generic "void *" would lack this type checking -typedef struct mDNSInterfaceID_dummystruct { void *dummy; } *mDNSInterfaceID; - -// These types are for opaque two- and four-byte identifiers. -// The "NotAnInteger" fields of the unions allow the value to be conveniently passed around in a -// register for the sake of efficiency, and compared for equality or inequality, but don't forget -- -// just because it is in a register doesn't mean it is an integer. Operations like greater than, -// less than, add, multiply, increment, decrement, etc., are undefined for opaque identifiers, -// and if you make the mistake of trying to do those using the NotAnInteger field, then you'll -// find you get code that doesn't work consistently on big-endian and little-endian machines. -#if defined(_WIN32) - #pragma pack(push,2) -#endif -typedef union { mDNSu8 b[ 2]; mDNSu16 NotAnInteger; } mDNSOpaque16; -typedef union { mDNSu8 b[ 4]; mDNSu32 NotAnInteger; } mDNSOpaque32; -typedef packedunion { mDNSu8 b[ 6]; mDNSu16 w[3]; mDNSu32 l[1]; } mDNSOpaque48; -typedef union { mDNSu8 b[ 8]; mDNSu16 w[4]; mDNSu32 l[2]; } mDNSOpaque64; -typedef union { mDNSu8 b[16]; mDNSu16 w[8]; mDNSu32 l[4]; } mDNSOpaque128; -#if defined(_WIN32) - #pragma pack(pop) -#endif - -typedef mDNSOpaque16 mDNSIPPort; // An IP port is a two-byte opaque identifier (not an integer) -typedef mDNSOpaque32 mDNSv4Addr; // An IP address is a four-byte opaque identifier (not an integer) -typedef mDNSOpaque128 mDNSv6Addr; // An IPv6 address is a 16-byte opaque identifier (not an integer) -typedef mDNSOpaque48 mDNSEthAddr; // An Ethernet address is a six-byte opaque identifier (not an integer) - -// Bit operations for opaque 64 bit quantity. Uses the 32 bit quantity(l[2]) to set and clear bits -#define mDNSNBBY 8 -#define bit_set_opaque64(op64, index) (op64.l[((index))/(sizeof(mDNSu32) * mDNSNBBY)] |= (1 << ((index) % (sizeof(mDNSu32) * mDNSNBBY)))) -#define bit_clr_opaque64(op64, index) (op64.l[((index))/(sizeof(mDNSu32) * mDNSNBBY)] &= ~(1 << ((index) % (sizeof(mDNSu32) * mDNSNBBY)))) -#define bit_get_opaque64(op64, index) (op64.l[((index))/(sizeof(mDNSu32) * mDNSNBBY)] & (1 << ((index) % (sizeof(mDNSu32) * mDNSNBBY)))) - -enum - { - mDNSAddrType_None = 0, - mDNSAddrType_IPv4 = 4, - mDNSAddrType_IPv6 = 6, - mDNSAddrType_Unknown = ~0 // Special marker value used in known answer list recording - }; - -enum - { - mDNSTransport_None = 0, - mDNSTransport_UDP = 1, - mDNSTransport_TCP = 2 - }; - -typedef struct - { - mDNSs32 type; - union { mDNSv6Addr v6; mDNSv4Addr v4; } ip; - } mDNSAddr; - -enum { mDNSfalse = 0, mDNStrue = 1 }; - -#define mDNSNULL 0L - -enum - { - mStatus_Waiting = 1, - mStatus_NoError = 0, - - // mDNS return values are in the range FFFE FF00 (-65792) to FFFE FFFF (-65537) - // The top end of the range (FFFE FFFF) is used for error codes; - // the bottom end of the range (FFFE FF00) is used for non-error values; - - // Error codes: - mStatus_UnknownErr = -65537, // First value: 0xFFFE FFFF - mStatus_NoSuchNameErr = -65538, - mStatus_NoMemoryErr = -65539, - mStatus_BadParamErr = -65540, - mStatus_BadReferenceErr = -65541, - mStatus_BadStateErr = -65542, - mStatus_BadFlagsErr = -65543, - mStatus_UnsupportedErr = -65544, - mStatus_NotInitializedErr = -65545, - mStatus_NoCache = -65546, - mStatus_AlreadyRegistered = -65547, - mStatus_NameConflict = -65548, - mStatus_Invalid = -65549, - mStatus_Firewall = -65550, - mStatus_Incompatible = -65551, - mStatus_BadInterfaceErr = -65552, - mStatus_Refused = -65553, - mStatus_NoSuchRecord = -65554, - mStatus_NoAuth = -65555, - mStatus_NoSuchKey = -65556, - mStatus_NATTraversal = -65557, - mStatus_DoubleNAT = -65558, - mStatus_BadTime = -65559, - mStatus_BadSig = -65560, // while we define this per RFC 2845, BIND 9 returns Refused for bad/missing signatures - mStatus_BadKey = -65561, - mStatus_TransientErr = -65562, // transient failures, e.g. sending packets shortly after a network transition or wake from sleep - mStatus_ServiceNotRunning = -65563, // Background daemon not running - mStatus_NATPortMappingUnsupported = -65564, // NAT doesn't support NAT-PMP or UPnP - mStatus_NATPortMappingDisabled = -65565, // NAT supports NAT-PMP or UPnP but it's disabled by the administrator - mStatus_NoRouter = -65566, - mStatus_PollingMode = -65567, - mStatus_Timeout = -65568, - // -65568 to -65786 currently unused; available for allocation - - // tcp connection status - mStatus_ConnPending = -65787, - mStatus_ConnFailed = -65788, - mStatus_ConnEstablished = -65789, - - // Non-error values: - mStatus_GrowCache = -65790, - mStatus_ConfigChanged = -65791, - mStatus_MemFree = -65792 // Last value: 0xFFFE FF00 - // mStatus_MemFree is the last legal mDNS error code, at the end of the range allocated for mDNS - }; - -typedef mDNSs32 mStatus; - -// RFC 1034/1035 specify that a domain label consists of a length byte plus up to 63 characters -#define MAX_DOMAIN_LABEL 63 -typedef struct { mDNSu8 c[ 64]; } domainlabel; // One label: length byte and up to 63 characters - -// RFC 1034/1035/2181 specify that a domain name (length bytes and data bytes) may be up to 255 bytes long, -// plus the terminating zero at the end makes 256 bytes total in the on-the-wire format. -#define MAX_DOMAIN_NAME 256 -typedef struct { mDNSu8 c[256]; } domainname; // Up to 256 bytes of length-prefixed domainlabels - -typedef struct { mDNSu8 c[256]; } UTF8str255; // Null-terminated C string - -// The longest legal textual form of a DNS name is 1009 bytes, including the C-string terminating NULL at the end. -// Explanation: -// When a native domainname object is converted to printable textual form using ConvertDomainNameToCString(), -// non-printing characters are represented in the conventional DNS way, as '\ddd', where ddd is a three-digit decimal number. -// The longest legal domain name is 256 bytes, in the form of four labels as shown below: -// Length byte, 63 data bytes, length byte, 63 data bytes, length byte, 63 data bytes, length byte, 62 data bytes, zero byte. -// Each label is encoded textually as characters followed by a trailing dot. -// If every character has to be represented as a four-byte escape sequence, then this makes the maximum textual form four labels -// plus the C-string terminating NULL as shown below: -// 63*4+1 + 63*4+1 + 63*4+1 + 62*4+1 + 1 = 1009. -// Note that MAX_ESCAPED_DOMAIN_LABEL is not normally used: If you're only decoding a single label, escaping is usually not required. -// It is for domain names, where dots are used as label separators, that proper escaping is vital. -#define MAX_ESCAPED_DOMAIN_LABEL 254 -#define MAX_ESCAPED_DOMAIN_NAME 1009 - -// MAX_REVERSE_MAPPING_NAME -// For IPv4: "123.123.123.123.in-addr.arpa." 30 bytes including terminating NUL -// For IPv6: "x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.ip6.arpa." 74 bytes including terminating NUL - -#define MAX_REVERSE_MAPPING_NAME_V4 30 -#define MAX_REVERSE_MAPPING_NAME_V6 74 -#define MAX_REVERSE_MAPPING_NAME 74 - -// Most records have a TTL of 75 minutes, so that their 80% cache-renewal query occurs once per hour. -// For records containing a hostname (in the name on the left, or in the rdata on the right), -// like A, AAAA, reverse-mapping PTR, and SRV, we use a two-minute TTL by default, because we don't want -// them to hang around for too long in the cache if the host in question crashes or otherwise goes away. - -#define kStandardTTL (3600UL * 100 / 80) -#define kHostNameTTL 120UL - -// Some applications want to register their SRV records with a lower ttl so that in case the server -// using a dynamic port number restarts, the clients will not have stale information for more than -// 10 seconds - -#define kHostNameSmallTTL 10UL - - -// Multicast DNS uses announcements (gratuitous responses) to update peer caches. -// This means it is feasible to use relatively larger TTL values than we might otherwise -// use, because we have a cache coherency protocol to keep the peer caches up to date. -// With Unicast DNS, once an authoritative server gives a record with a certain TTL value to a client -// or caching server, that client or caching server is entitled to hold onto the record until its TTL -// expires, and has no obligation to contact the authoritative server again until that time arrives. -// This means that whereas Multicast DNS can use announcements to pre-emptively update stale data -// before it would otherwise have expired, standard Unicast DNS (not using LLQs) has no equivalent -// mechanism, and TTL expiry is the *only* mechanism by which stale data gets deleted. Because of this, -// we currently limit the TTL to ten seconds in such cases where no dynamic cache updating is possible. -#define kStaticCacheTTL 10 - -#define DefaultTTLforRRType(X) (((X) == kDNSType_A || (X) == kDNSType_AAAA || (X) == kDNSType_SRV) ? kHostNameTTL : kStandardTTL) - -typedef struct AuthRecord_struct AuthRecord; -typedef struct ServiceRecordSet_struct ServiceRecordSet; -typedef struct CacheRecord_struct CacheRecord; -typedef struct CacheGroup_struct CacheGroup; -typedef struct AuthGroup_struct AuthGroup; -typedef struct DNSQuestion_struct DNSQuestion; -typedef struct ZoneData_struct ZoneData; -typedef struct mDNS_struct mDNS; -typedef struct mDNS_PlatformSupport_struct mDNS_PlatformSupport; -typedef struct NATTraversalInfo_struct NATTraversalInfo; - -// Structure to abstract away the differences between TCP/SSL sockets, and one for UDP sockets -// The actual definition of these structures appear in the appropriate platform support code -typedef struct TCPSocket_struct TCPSocket; -typedef struct UDPSocket_struct UDPSocket; - -// *************************************************************************** -#if 0 -#pragma mark - -#pragma mark - DNS Message structures -#endif - -#define mDNS_numZones numQuestions -#define mDNS_numPrereqs numAnswers -#define mDNS_numUpdates numAuthorities - -typedef packedstruct - { - mDNSOpaque16 id; - mDNSOpaque16 flags; - mDNSu16 numQuestions; - mDNSu16 numAnswers; - mDNSu16 numAuthorities; - mDNSu16 numAdditionals; - } DNSMessageHeader; - -// We can send and receive packets up to 9000 bytes (Ethernet Jumbo Frame size, if that ever becomes widely used) -// However, in the normal case we try to limit packets to 1500 bytes so that we don't get IP fragmentation on standard Ethernet -// 40 (IPv6 header) + 8 (UDP header) + 12 (DNS message header) + 1440 (DNS message body) = 1500 total -#define AbsoluteMaxDNSMessageData 8940 -#define NormalMaxDNSMessageData 1440 -typedef packedstruct - { - DNSMessageHeader h; // Note: Size 12 bytes - mDNSu8 data[AbsoluteMaxDNSMessageData]; // 40 (IPv6) + 8 (UDP) + 12 (DNS header) + 8940 (data) = 9000 - } DNSMessage; - -typedef struct tcpInfo_t - { - mDNS *m; - TCPSocket *sock; - DNSMessage request; - int requestLen; - DNSQuestion *question; // For queries - AuthRecord *rr; // For record updates - mDNSAddr Addr; - mDNSIPPort Port; - mDNSIPPort SrcPort; - DNSMessage *reply; - mDNSu16 replylen; - unsigned long nread; - int numReplies; - } tcpInfo_t; - -// *************************************************************************** -#if 0 -#pragma mark - -#pragma mark - Other Packet Format Structures -#endif - -typedef packedstruct - { - mDNSEthAddr dst; - mDNSEthAddr src; - mDNSOpaque16 ethertype; - } EthernetHeader; // 14 bytes - -typedef packedstruct - { - mDNSOpaque16 hrd; - mDNSOpaque16 pro; - mDNSu8 hln; - mDNSu8 pln; - mDNSOpaque16 op; - mDNSEthAddr sha; - mDNSv4Addr spa; - mDNSEthAddr tha; - mDNSv4Addr tpa; - } ARP_EthIP; // 28 bytes - -typedef packedstruct - { - mDNSu8 vlen; - mDNSu8 tos; - mDNSu16 totlen; - mDNSOpaque16 id; - mDNSOpaque16 flagsfrags; - mDNSu8 ttl; - mDNSu8 protocol; // Payload type: 0x06 = TCP, 0x11 = UDP - mDNSu16 checksum; - mDNSv4Addr src; - mDNSv4Addr dst; - } IPv4Header; // 20 bytes - -typedef packedstruct - { - mDNSu32 vcf; // Version, Traffic Class, Flow Label - mDNSu16 len; // Payload Length - mDNSu8 pro; // Type of next header: 0x06 = TCP, 0x11 = UDP, 0x3A = ICMPv6 - mDNSu8 ttl; // Hop Limit - mDNSv6Addr src; - mDNSv6Addr dst; - } IPv6Header; // 40 bytes - -typedef packedstruct - { - mDNSv6Addr src; - mDNSv6Addr dst; - mDNSOpaque32 len; - mDNSOpaque32 pro; - } IPv6PseudoHeader; // 40 bytes - -typedef union - { - mDNSu8 bytes[20]; - ARP_EthIP arp; - IPv4Header v4; - IPv6Header v6; - } NetworkLayerPacket; - -typedef packedstruct - { - mDNSIPPort src; - mDNSIPPort dst; - mDNSu32 seq; - mDNSu32 ack; - mDNSu8 offset; - mDNSu8 flags; - mDNSu16 window; - mDNSu16 checksum; - mDNSu16 urgent; - } TCPHeader; // 20 bytes; IP protocol type 0x06 - -typedef packedstruct - { - mDNSIPPort src; - mDNSIPPort dst; - mDNSu16 len; // Length including UDP header (i.e. minimum value is 8 bytes) - mDNSu16 checksum; - } UDPHeader; // 8 bytes; IP protocol type 0x11 - -typedef packedstruct - { - mDNSu8 type; // 0x87 == Neighbor Solicitation, 0x88 == Neighbor Advertisement - mDNSu8 code; - mDNSu16 checksum; - mDNSu32 flags_res; // R/S/O flags and reserved bits - mDNSv6Addr target; - // Typically 8 bytes of options are also present - } IPv6NDP; // 24 bytes or more; IP protocol type 0x3A - -#define NDP_Sol 0x87 -#define NDP_Adv 0x88 - -#define NDP_Router 0x80 -#define NDP_Solicited 0x40 -#define NDP_Override 0x20 - -#define NDP_SrcLL 1 -#define NDP_TgtLL 2 - -typedef union - { - mDNSu8 bytes[20]; - TCPHeader tcp; - UDPHeader udp; - IPv6NDP ndp; - } TransportLayerPacket; - -typedef packedstruct - { - mDNSOpaque64 InitiatorCookie; - mDNSOpaque64 ResponderCookie; - mDNSu8 NextPayload; - mDNSu8 Version; - mDNSu8 ExchangeType; - mDNSu8 Flags; - mDNSOpaque32 MessageID; - mDNSu32 Length; - } IKEHeader; // 28 bytes - -// *************************************************************************** -#if 0 -#pragma mark - -#pragma mark - Resource Record structures -#endif - -// Authoritative Resource Records: -// There are four basic types: Shared, Advisory, Unique, Known Unique - -// * Shared Resource Records do not have to be unique -// -- Shared Resource Records are used for DNS-SD service PTRs -// -- It is okay for several hosts to have RRs with the same name but different RDATA -// -- We use a random delay on responses to reduce collisions when all the hosts respond to the same query -// -- These RRs typically have moderately high TTLs (e.g. one hour) -// -- These records are announced on startup and topology changes for the benefit of passive listeners -// -- These records send a goodbye packet when deregistering -// -// * Advisory Resource Records are like Shared Resource Records, except they don't send a goodbye packet -// -// * Unique Resource Records should be unique among hosts within any given mDNS scope -// -- The majority of Resource Records are of this type -// -- If two entities on the network have RRs with the same name but different RDATA, this is a conflict -// -- Responses may be sent immediately, because only one host should be responding to any particular query -// -- These RRs typically have low TTLs (e.g. a few minutes) -// -- On startup and after topology changes, a host issues queries to verify uniqueness - -// * Known Unique Resource Records are treated like Unique Resource Records, except that mDNS does -// not have to verify their uniqueness because this is already known by other means (e.g. the RR name -// is derived from the host's IP or Ethernet address, which is already known to be a unique identifier). - -// Summary of properties of different record types: -// Probe? Does this record type send probes before announcing? -// Conflict? Does this record type react if we observe an apparent conflict? -// Goodbye? Does this record type send a goodbye packet on departure? -// -// Probe? Conflict? Goodbye? Notes -// Unregistered Should not appear in any list (sanity check value) -// Shared No No Yes e.g. Service PTR record -// Deregistering No No Yes Shared record about to announce its departure and leave the list -// Advisory No No No -// Unique Yes Yes No Record intended to be unique -- will probe to verify -// Verified Yes Yes No Record has completed probing, and is verified unique -// KnownUnique No Yes No Record is assumed by other means to be unique - -// Valid lifecycle of a record: -// Unregistered -> Shared -> Deregistering -(goodbye)-> Unregistered -// Unregistered -> Advisory -> Unregistered -// Unregistered -> Unique -(probe)-> Verified -> Unregistered -// Unregistered -> KnownUnique -> Unregistered - -// Each Authoritative kDNSRecordType has only one bit set. This makes it easy to quickly see if a record -// is one of a particular set of types simply by performing the appropriate bitwise masking operation. - -// Cache Resource Records (received from the network): -// There are four basic types: Answer, Unique Answer, Additional, Unique Additional -// Bit 7 (the top bit) of kDNSRecordType is always set for Cache Resource Records; always clear for Authoritative Resource Records -// Bit 6 (value 0x40) is set for answer records; clear for authority/additional records -// Bit 5 (value 0x20) is set for records received with the kDNSClass_UniqueRRSet - -enum - { - kDNSRecordTypeUnregistered = 0x00, // Not currently in any list - kDNSRecordTypeDeregistering = 0x01, // Shared record about to announce its departure and leave the list - - kDNSRecordTypeUnique = 0x02, // Will become a kDNSRecordTypeVerified when probing is complete - - kDNSRecordTypeAdvisory = 0x04, // Like Shared, but no goodbye packet - kDNSRecordTypeShared = 0x08, // Shared means record name does not have to be unique -- use random delay on responses - - kDNSRecordTypeVerified = 0x10, // Unique means mDNS should check that name is unique (and then send immediate responses) - kDNSRecordTypeKnownUnique = 0x20, // Known Unique means mDNS can assume name is unique without checking - // For Dynamic Update records, Known Unique means the record must already exist on the server. - kDNSRecordTypeUniqueMask = (kDNSRecordTypeUnique | kDNSRecordTypeVerified | kDNSRecordTypeKnownUnique), - kDNSRecordTypeActiveSharedMask = (kDNSRecordTypeAdvisory | kDNSRecordTypeShared), - kDNSRecordTypeActiveUniqueMask = (kDNSRecordTypeVerified | kDNSRecordTypeKnownUnique), - kDNSRecordTypeActiveMask = (kDNSRecordTypeActiveSharedMask | kDNSRecordTypeActiveUniqueMask), - - kDNSRecordTypePacketAdd = 0x80, // Received in the Additional Section of a DNS Response - kDNSRecordTypePacketAddUnique = 0x90, // Received in the Additional Section of a DNS Response with kDNSClass_UniqueRRSet set - kDNSRecordTypePacketAuth = 0xA0, // Received in the Authorities Section of a DNS Response - kDNSRecordTypePacketAuthUnique = 0xB0, // Received in the Authorities Section of a DNS Response with kDNSClass_UniqueRRSet set - kDNSRecordTypePacketAns = 0xC0, // Received in the Answer Section of a DNS Response - kDNSRecordTypePacketAnsUnique = 0xD0, // Received in the Answer Section of a DNS Response with kDNSClass_UniqueRRSet set - - kDNSRecordTypePacketNegative = 0xF0, // Pseudo-RR generated to cache non-existence results like NXDomain - - kDNSRecordTypePacketUniqueMask = 0x10 // True for PacketAddUnique, PacketAnsUnique, PacketAuthUnique, kDNSRecordTypePacketNegative - }; - -typedef packedstruct { mDNSu16 priority; mDNSu16 weight; mDNSIPPort port; domainname target; } rdataSRV; -typedef packedstruct { mDNSu16 preference; domainname exchange; } rdataMX; -typedef packedstruct { domainname mbox; domainname txt; } rdataRP; -typedef packedstruct { mDNSu16 preference; domainname map822; domainname mapx400; } rdataPX; - -typedef packedstruct - { - domainname mname; - domainname rname; - mDNSs32 serial; // Modular counter; increases when zone changes - mDNSu32 refresh; // Time in seconds that a slave waits after successful replication of the database before it attempts replication again - mDNSu32 retry; // Time in seconds that a slave waits after an unsuccessful replication attempt before it attempts replication again - mDNSu32 expire; // Time in seconds that a slave holds on to old data while replication attempts remain unsuccessful - mDNSu32 min; // Nominally the minimum record TTL for this zone, in seconds; also used for negative caching. - } rdataSOA; - -// EDNS Option Code registrations are recorded in the "DNS EDNS0 Options" section of -// - -#define kDNSOpt_LLQ 1 -#define kDNSOpt_Lease 2 -#define kDNSOpt_NSID 3 -#define kDNSOpt_Owner 4 - -typedef struct - { - mDNSu16 vers; - mDNSu16 llqOp; - mDNSu16 err; // Or UDP reply port, in setup request - // Note: In the in-memory form, there's typically a two-byte space here, so that the following 64-bit id is word-aligned - mDNSOpaque64 id; - mDNSu32 llqlease; - } LLQOptData; - -typedef struct - { - mDNSu8 vers; // Version number of this Owner OPT record - mDNSs8 seq; // Sleep/wake epoch - mDNSEthAddr HMAC; // Host's primary identifier (e.g. MAC of on-board Ethernet) - mDNSEthAddr IMAC; // Interface's MAC address (if different to primary MAC) - mDNSOpaque48 password; // Optional password - } OwnerOptData; - -// Note: rdataOPT format may be repeated an arbitrary number of times in a single resource record -typedef packedstruct - { - mDNSu16 opt; - mDNSu16 optlen; - union { LLQOptData llq; mDNSu32 updatelease; OwnerOptData owner; } u; - } rdataOPT; - -// Space needed to put OPT records into a packet: -// Header 11 bytes (name 1, type 2, class 2, TTL 4, length 2) -// LLQ rdata 18 bytes (opt 2, len 2, vers 2, op 2, err 2, id 8, lease 4) -// Lease rdata 8 bytes (opt 2, len 2, lease 4) -// Owner rdata 12-24 (opt 2, len 2, owner 8-20) - -#define DNSOpt_Header_Space 11 -#define DNSOpt_LLQData_Space (4 + 2 + 2 + 2 + 8 + 4) -#define DNSOpt_LeaseData_Space (4 + 4) -#define DNSOpt_OwnerData_ID_Space (4 + 2 + 6) -#define DNSOpt_OwnerData_ID_Wake_Space (4 + 2 + 6 + 6) -#define DNSOpt_OwnerData_ID_Wake_PW4_Space (4 + 2 + 6 + 6 + 4) -#define DNSOpt_OwnerData_ID_Wake_PW6_Space (4 + 2 + 6 + 6 + 6) - -#define ValidOwnerLength(X) ( (X) == DNSOpt_OwnerData_ID_Space - 4 || \ - (X) == DNSOpt_OwnerData_ID_Wake_Space - 4 || \ - (X) == DNSOpt_OwnerData_ID_Wake_PW4_Space - 4 || \ - (X) == DNSOpt_OwnerData_ID_Wake_PW6_Space - 4 ) - -#define DNSOpt_Owner_Space(A,B) (mDNSSameEthAddress((A),(B)) ? DNSOpt_OwnerData_ID_Space : DNSOpt_OwnerData_ID_Wake_Space) - -#define DNSOpt_Data_Space(O) ( \ - (O)->opt == kDNSOpt_LLQ ? DNSOpt_LLQData_Space : \ - (O)->opt == kDNSOpt_Lease ? DNSOpt_LeaseData_Space : \ - (O)->opt == kDNSOpt_Owner ? DNSOpt_Owner_Space(&(O)->u.owner.HMAC, &(O)->u.owner.IMAC) : 0x10000) - -// A maximal NSEC record is: -// 256 bytes domainname 'nextname' -// + 256 * 34 = 8704 bytes of bitmap data -// = 8960 bytes total -// For now we only support NSEC records encoding DNS types 0-255 and ignore the nextname (we always set it to be the same as the rrname), -// which gives us a fixed in-memory size of 32 bytes (256 bits) -typedef struct - { - mDNSu8 bitmap[32]; - } rdataNSEC; - -// StandardAuthRDSize is 264 (256+8), which is large enough to hold a maximum-sized SRV record (6 + 256 bytes) -// MaximumRDSize is 8K the absolute maximum we support (at least for now) -#define StandardAuthRDSize 264 -#define MaximumRDSize 8192 - -// InlineCacheRDSize is 68 -// Records received from the network with rdata this size or less have their rdata stored right in the CacheRecord object -// Records received from the network with rdata larger than this have additional storage allocated for the rdata -// A quick unscientific sample from a busy network at Apple with lots of machines revealed this: -// 1461 records in cache -// 292 were one-byte TXT records -// 136 were four-byte A records -// 184 were sixteen-byte AAAA records -// 780 were various PTR, TXT and SRV records from 12-64 bytes -// Only 69 records had rdata bigger than 64 bytes -// Note that since CacheRecord object and a CacheGroup object are allocated out of the same pool, it's sensible to -// have them both be the same size. Making one smaller without making the other smaller won't actually save any memory. -#define InlineCacheRDSize 68 - -// On 64-bit, the pointers in a CacheRecord are bigger, and that creates 8 bytes more space for the name in a CacheGroup -#if ENABLE_MULTI_PACKET_QUERY_SNOOPING - #if defined(_ILP64) || defined(__ILP64__) || defined(_LP64) || defined(__LP64__) || defined(_WIN64) - #define InlineCacheGroupNameSize 160 - #else - #define InlineCacheGroupNameSize 148 - #endif -#else - #if defined(_ILP64) || defined(__ILP64__) || defined(_LP64) || defined(__LP64__) || defined(_WIN64) - #define InlineCacheGroupNameSize 144 - #else - #define InlineCacheGroupNameSize 132 - #endif -#endif - -// The RDataBody union defines the common rdata types that fit into our 264-byte limit -typedef union - { - mDNSu8 data[StandardAuthRDSize]; - mDNSv4Addr ipv4; // For 'A' record - domainname name; // For PTR, NS, CNAME, DNAME - UTF8str255 txt; - rdataMX mx; - mDNSv6Addr ipv6; // For 'AAAA' record - rdataSRV srv; - rdataOPT opt[2]; // For EDNS0 OPT record; RDataBody may contain multiple variable-length rdataOPT objects packed together - rdataNSEC nsec; - } RDataBody; - -// The RDataBody2 union is the same as above, except it includes fields for the larger types like soa, rp, px -typedef union - { - mDNSu8 data[StandardAuthRDSize]; - mDNSv4Addr ipv4; // For 'A' record - domainname name; // For PTR, NS, CNAME, DNAME - rdataSOA soa; // This is large; not included in the normal RDataBody definition - UTF8str255 txt; - rdataMX mx; - rdataRP rp; // This is large; not included in the normal RDataBody definition - rdataPX px; // This is large; not included in the normal RDataBody definition - mDNSv6Addr ipv6; // For 'AAAA' record - rdataSRV srv; - rdataOPT opt[2]; // For EDNS0 OPT record; RDataBody may contain multiple variable-length rdataOPT objects packed together - rdataNSEC nsec; - } RDataBody2; - -typedef struct - { - mDNSu16 MaxRDLength; // Amount of storage allocated for rdata (usually sizeof(RDataBody)) - mDNSu16 padding; // So that RDataBody is aligned on 32-bit boundary - RDataBody u; - } RData; - -// sizeofRDataHeader should be 4 bytes -#define sizeofRDataHeader (sizeof(RData) - sizeof(RDataBody)) - -// RData_small is a smaller version of the RData object, used for inline data storage embedded in a CacheRecord_struct -typedef struct - { - mDNSu16 MaxRDLength; // Storage allocated for data (may be greater than InlineCacheRDSize if additional storage follows this object) - mDNSu16 padding; // So that data is aligned on 32-bit boundary - mDNSu8 data[InlineCacheRDSize]; - } RData_small; - -// Note: Within an mDNSRecordCallback mDNS all API calls are legal except mDNS_Init(), mDNS_Exit(), mDNS_Execute() -typedef void mDNSRecordCallback(mDNS *const m, AuthRecord *const rr, mStatus result); - -// Note: -// Restrictions: An mDNSRecordUpdateCallback may not make any mDNS API calls. -// The intent of this callback is to allow the client to free memory, if necessary. -// The internal data structures of the mDNS code may not be in a state where mDNS API calls may be made safely. -typedef void mDNSRecordUpdateCallback(mDNS *const m, AuthRecord *const rr, RData *OldRData, mDNSu16 OldRDLen); - -// *************************************************************************** -#if 0 -#pragma mark - -#pragma mark - NAT Traversal structures and constants -#endif - -#define NATMAP_MAX_RETRY_INTERVAL ((mDNSPlatformOneSecond * 60) * 15) // Max retry interval is 15 minutes -#define NATMAP_MIN_RETRY_INTERVAL (mDNSPlatformOneSecond * 2) // Min retry interval is 2 seconds -#define NATMAP_INIT_RETRY (mDNSPlatformOneSecond / 4) // start at 250ms w/ exponential decay -#define NATMAP_DEFAULT_LEASE (60 * 60 * 2) // 2 hour lease life in seconds -#define NATMAP_VERS 0 - -typedef enum - { - NATOp_AddrRequest = 0, - NATOp_MapUDP = 1, - NATOp_MapTCP = 2, - - NATOp_AddrResponse = 0x80 | 0, - NATOp_MapUDPResponse = 0x80 | 1, - NATOp_MapTCPResponse = 0x80 | 2, - } NATOp_t; - -enum - { - NATErr_None = 0, - NATErr_Vers = 1, - NATErr_Refused = 2, - NATErr_NetFail = 3, - NATErr_Res = 4, - NATErr_Opcode = 5 - }; - -typedef mDNSu16 NATErr_t; - -typedef packedstruct - { - mDNSu8 vers; - mDNSu8 opcode; - } NATAddrRequest; - -typedef packedstruct - { - mDNSu8 vers; - mDNSu8 opcode; - mDNSu16 err; - mDNSu32 upseconds; // Time since last NAT engine reboot, in seconds - mDNSv4Addr ExtAddr; - } NATAddrReply; - -typedef packedstruct - { - mDNSu8 vers; - mDNSu8 opcode; - mDNSOpaque16 unused; - mDNSIPPort intport; - mDNSIPPort extport; - mDNSu32 NATReq_lease; - } NATPortMapRequest; - -typedef packedstruct - { - mDNSu8 vers; - mDNSu8 opcode; - mDNSu16 err; - mDNSu32 upseconds; // Time since last NAT engine reboot, in seconds - mDNSIPPort intport; - mDNSIPPort extport; - mDNSu32 NATRep_lease; - } NATPortMapReply; - -typedef enum - { - LNTDiscoveryOp = 1, - LNTExternalAddrOp = 2, - LNTPortMapOp = 3, - LNTPortMapDeleteOp = 4 - } LNTOp_t; - -#define LNT_MAXBUFSIZE 8192 -typedef struct tcpLNTInfo_struct tcpLNTInfo; -struct tcpLNTInfo_struct - { - tcpLNTInfo *next; - mDNS *m; - NATTraversalInfo *parentNATInfo; // pointer back to the parent NATTraversalInfo - TCPSocket *sock; - LNTOp_t op; // operation performed using this connection - mDNSAddr Address; // router address - mDNSIPPort Port; // router port - mDNSu8 *Request; // xml request to router - int requestLen; - mDNSu8 *Reply; // xml reply from router - int replyLen; - unsigned long nread; // number of bytes read so far - int retries; // number of times we've tried to do this port mapping - }; - -typedef void (*NATTraversalClientCallback)(mDNS *m, NATTraversalInfo *n); - -// if m->timenow < ExpiryTime then we have an active mapping, and we'll renew halfway to expiry -// if m->timenow >= ExpiryTime then our mapping has expired, and we're trying to create one - -struct NATTraversalInfo_struct - { - // Internal state fields. These are used internally by mDNSCore; the client layer needn't be concerned with them. - NATTraversalInfo *next; - - mDNSs32 ExpiryTime; // Time this mapping expires, or zero if no mapping - mDNSs32 retryInterval; // Current interval, between last packet we sent and the next one - mDNSs32 retryPortMap; // If Protocol is nonzero, time to send our next mapping packet - mStatus NewResult; // New error code; will be copied to Result just prior to invoking callback - -#ifdef _LEGACY_NAT_TRAVERSAL_ - tcpLNTInfo tcpInfo; // Legacy NAT traversal (UPnP) TCP connection -#endif - - // Result fields: When the callback is invoked these fields contain the answers the client is looking for - // When the callback is invoked ExternalPort is *usually* set to be the same the same as RequestedPort, except: - // (a) When we're behind a NAT gateway with port mapping disabled, ExternalPort is reported as zero to - // indicate that we don't currently have a working mapping (but RequestedPort retains the external port - // we'd like to get, the next time we meet an accomodating NAT gateway willing to give us one). - // (b) When we have a routable non-RFC1918 address, we don't *need* a port mapping, so ExternalPort - // is reported as the same as our InternalPort, since that is effectively our externally-visible port too. - // Again, RequestedPort retains the external port we'd like to get the next time we find ourself behind a NAT gateway. - // To improve stability of port mappings, RequestedPort is updated any time we get a successful - // mapping response from the NAT-PMP or UPnP gateway. For example, if we ask for port 80, and - // get assigned port 81, then thereafter we'll contine asking for port 81. - mDNSInterfaceID InterfaceID; - mDNSv4Addr ExternalAddress; // Initially set to onesIPv4Addr, until first callback - mDNSIPPort ExternalPort; - mDNSu32 Lifetime; - mStatus Result; - - // Client API fields: The client must set up these fields *before* making any NAT traversal API calls - mDNSu8 Protocol; // NATOp_MapUDP or NATOp_MapTCP, or zero if just requesting the external IP address - mDNSIPPort IntPort; // Client's internal port number (doesn't change) - mDNSIPPort RequestedPort; // Requested external port; may be updated with actual value assigned by gateway - mDNSu32 NATLease; // Requested lifetime in seconds (doesn't change) - NATTraversalClientCallback clientCallback; - void *clientContext; - }; - -enum - { - DNSServer_Untested = 0, - DNSServer_Passed = 1, - DNSServer_Failed = 2, - DNSServer_Disabled = 3 - }; - -enum - { - DNSServer_FlagDelete = 1, - DNSServer_FlagNew = 2 - }; - -enum - { - McastResolver_FlagDelete = 1, - McastResolver_FlagNew = 2 - }; - -typedef struct McastResolver - { - struct McastResolver *next; - mDNSInterfaceID interface; - mDNSu32 flags; // Set when we're planning to delete this from the list - domainname domain; - mDNSu32 timeout; // timeout value for questions - } McastResolver; - -typedef struct DNSServer - { - struct DNSServer *next; - mDNSInterfaceID interface; // For specialized uses; we can have DNS servers reachable over specific interfaces - mDNSAddr addr; - mDNSIPPort port; - mDNSOpaque16 testid; - mDNSu32 flags; // Set when we're planning to delete this from the list - mDNSu32 teststate; // Have we sent bug-detection query to this server? - mDNSs32 lasttest; // Time we sent last bug-detection query to this server - domainname domain; // name->server matching for "split dns" - mDNSs32 penaltyTime; // amount of time this server is penalized - mDNSBool scoped; // interface should be matched against question only - // if scoped is set - mDNSu32 timeout; // timeout value for questions - mDNSBool cellIntf; // Resolver from Cellular Interface ? - } DNSServer; - -typedef struct // Size is 36 bytes when compiling for 32-bit; 48 when compiling for 64-bit - { - mDNSu8 RecordType; // See enum above - mDNSu16 rrtype; - mDNSu16 rrclass; - mDNSu32 rroriginalttl; // In seconds - mDNSu16 rdlength; // Size of the raw rdata, in bytes, in the on-the-wire format - // (In-memory storage may be larger, for structures containing 'holes', like SOA, - // or smaller, for NSEC where we don't bother storing the nextname field) - mDNSu16 rdestimate; // Upper bound on on-the-wire size of rdata after name compression - mDNSu32 namehash; // Name-based (i.e. case-insensitive) hash of name - mDNSu32 rdatahash; // For rdata containing domain name (e.g. PTR, SRV, CNAME etc.), case-insensitive name hash - // else, for all other rdata, 32-bit hash of the raw rdata - // Note: This requirement is important. Various routines like AddAdditionalsToResponseList(), - // ReconfirmAntecedents(), etc., use rdatahash as a pre-flight check to see - // whether it's worth doing a full SameDomainName() call. If the rdatahash - // is not a correct case-insensitive name hash, they'll get false negatives. - - // Grouping pointers together at the end of the structure improves the memory layout efficiency - mDNSInterfaceID InterfaceID; // Set if this RR is specific to one interface - // For records received off the wire, InterfaceID is *always* set to the receiving interface - // For our authoritative records, InterfaceID is usually zero, except for those few records - // that are interface-specific (e.g. address records, especially linklocal addresses) - const domainname *name; - RData *rdata; // Pointer to storage for this rdata - DNSServer *rDNSServer; // Unicast DNS server authoritative for this entry;null for multicast - } ResourceRecord; - -// Unless otherwise noted, states may apply to either independent record registrations or service registrations -typedef enum - { - regState_Zero = 0, - regState_Pending = 1, // update sent, reply not received - regState_Registered = 2, // update sent, reply received - regState_DeregPending = 3, // dereg sent, reply not received - regState_Unregistered = 4, // not in any list - regState_Refresh = 5, // outstanding refresh (or target change) message - regState_NATMap = 6, // establishing NAT port mapping - regState_UpdatePending = 7, // update in flight as result of mDNS_Update call - regState_NoTarget = 8, // SRV Record registration pending registration of hostname - regState_NATError = 9 // unable to complete NAT traversal - } regState_t; - -enum - { - Target_Manual = 0, - Target_AutoHost = 1, - Target_AutoHostAndNATMAP = 2 - }; - -typedef enum - { - mergeState_Zero = 0, - mergeState_DontMerge = 1 // Set on fatal error conditions to disable merging - } mergeState_t; - -struct AuthGroup_struct // Header object for a list of AuthRecords with the same name - { - AuthGroup *next; // Next AuthGroup object in this hash table bucket - mDNSu32 namehash; // Name-based (i.e. case insensitive) hash of name - AuthRecord *members; // List of CacheRecords with this same name - AuthRecord **rrauth_tail; // Tail end of that list - domainname *name; // Common name for all AuthRecords in this list - AuthRecord *NewLocalOnlyRecords; - // Size to here is 20 bytes when compiling 32-bit; 40 bytes when compiling 64-bit - mDNSu8 namestorage[InlineCacheGroupNameSize]; - }; - -#define AUTH_HASH_SLOTS 499 -#define FORALL_AUTHRECORDS(SLOT,AG,AR) \ - for ((SLOT) = 0; (SLOT) < AUTH_HASH_SLOTS; (SLOT)++) \ - for ((AG)=m->rrauth.rrauth_hash[(SLOT)]; (AG); (AG)=(AG)->next) \ - for ((AR) = (AG)->members; (AR); (AR)=(AR)->next) - -typedef union AuthEntity_union AuthEntity; -union AuthEntity_union { AuthEntity *next; AuthGroup ag; }; -typedef struct { - mDNSu32 rrauth_size; // Total number of available auth entries - mDNSu32 rrauth_totalused; // Number of auth entries currently occupied - mDNSu32 rrauth_report; - mDNSu8 rrauth_lock; // For debugging: Set at times when these lists may not be modified - AuthEntity *rrauth_free; - AuthGroup *rrauth_hash[AUTH_HASH_SLOTS]; -}AuthHash; - -// AuthRecordAny includes mDNSInterface_Any and interface specific auth records (anything -// other than P2P or LocalOnly) -typedef enum - { - AuthRecordAny, // registered for *Any, NOT including P2P interfaces - AuthRecordAnyIncludeP2P, // registered for *Any, including P2P interfaces - AuthRecordLocalOnly, - AuthRecordP2P // discovered over D2D/P2P framework - } AuthRecType; - -struct AuthRecord_struct - { - // For examples of how to set up this structure for use in mDNS_Register(), - // see mDNS_AdvertiseInterface() or mDNS_RegisterService(). - // Basically, resrec and persistent metadata need to be set up before calling mDNS_Register(). - // mDNS_SetupResourceRecord() is avaliable as a helper routine to set up most fields to sensible default values for you - - AuthRecord *next; // Next in list; first element of structure for efficiency reasons - // Field Group 1: Common ResourceRecord fields - ResourceRecord resrec; // 36 bytes when compiling for 32-bit; 48 when compiling for 64-bit - - // Field Group 2: Persistent metadata for Authoritative Records - AuthRecord *Additional1; // Recommended additional record to include in response (e.g. SRV for PTR record) - AuthRecord *Additional2; // Another additional (e.g. TXT for PTR record) - AuthRecord *DependentOn; // This record depends on another for its uniqueness checking - AuthRecord *RRSet; // This unique record is part of an RRSet - mDNSRecordCallback *RecordCallback; // Callback function to call for state changes, and to free memory asynchronously on deregistration - void *RecordContext; // Context parameter for the callback function - mDNSu8 AutoTarget; // Set if the target of this record (PTR, CNAME, SRV, etc.) is our host name - mDNSu8 AllowRemoteQuery; // Set if we allow hosts not on the local link to query this record - mDNSu8 ForceMCast; // Set by client to advertise solely via multicast, even for apparently unicast names - - OwnerOptData WakeUp; // WakeUp.HMAC.l[0] nonzero indicates that this is a Sleep Proxy record - mDNSAddr AddressProxy; // For reverse-mapping Sleep Proxy PTR records, address in question - mDNSs32 TimeRcvd; // In platform time units - mDNSs32 TimeExpire; // In platform time units - AuthRecType ARType; // LocalOnly, P2P or Normal ? - - // Field Group 3: Transient state for Authoritative Records - mDNSu8 Acknowledged; // Set if we've given the success callback to the client - mDNSu8 ProbeCount; // Number of probes remaining before this record is valid (kDNSRecordTypeUnique) - mDNSu8 AnnounceCount; // Number of announcements remaining (kDNSRecordTypeShared) - mDNSu8 RequireGoodbye; // Set if this RR has been announced on the wire and will require a goodbye packet - mDNSu8 AnsweredLocalQ; // Set if this AuthRecord has been delivered to any local question (LocalOnly or mDNSInterface_Any) - mDNSu8 IncludeInProbe; // Set if this RR is being put into a probe right now - mDNSu8 ImmedUnicast; // Set if we may send our response directly via unicast to the requester - mDNSInterfaceID SendNSECNow; // Set if we need to generate associated NSEC data for this rrname - mDNSInterfaceID ImmedAnswer; // Someone on this interface issued a query we need to answer (all-ones for all interfaces) -#if MDNS_LOG_ANSWER_SUPPRESSION_TIMES - mDNSs32 ImmedAnswerMarkTime; -#endif - mDNSInterfaceID ImmedAdditional; // Hint that we might want to also send this record, just to be helpful - mDNSInterfaceID SendRNow; // The interface this query is being sent on right now - mDNSv4Addr v4Requester; // Recent v4 query for this record, or all-ones if more than one recent query - mDNSv6Addr v6Requester; // Recent v6 query for this record, or all-ones if more than one recent query - AuthRecord *NextResponse; // Link to the next element in the chain of responses to generate - const mDNSu8 *NR_AnswerTo; // Set if this record was selected by virtue of being a direct answer to a question - AuthRecord *NR_AdditionalTo; // Set if this record was selected by virtue of being additional to another - mDNSs32 ThisAPInterval; // In platform time units: Current interval for announce/probe - mDNSs32 LastAPTime; // In platform time units: Last time we sent announcement/probe - mDNSs32 LastMCTime; // Last time we multicast this record (used to guard against packet-storm attacks) - mDNSInterfaceID LastMCInterface; // Interface this record was multicast on at the time LastMCTime was recorded - RData *NewRData; // Set if we are updating this record with new rdata - mDNSu16 newrdlength; // ... and the length of the new RData - mDNSRecordUpdateCallback *UpdateCallback; - mDNSu32 UpdateCredits; // Token-bucket rate limiting of excessive updates - mDNSs32 NextUpdateCredit; // Time next token is added to bucket - mDNSs32 UpdateBlocked; // Set if update delaying is in effect - - // Field Group 4: Transient uDNS state for Authoritative Records - regState_t state; // Maybe combine this with resrec.RecordType state? Right now it's ambiguous and confusing. - // e.g. rr->resrec.RecordType can be kDNSRecordTypeUnregistered, - // and rr->state can be regState_Unregistered - // What if we find one of those statements is true and the other false? What does that mean? - mDNSBool uselease; // dynamic update contains (should contain) lease option - mDNSs32 expire; // In platform time units: expiration of lease (-1 for static) - mDNSBool Private; // If zone is private, DNS updates may have to be encrypted to prevent eavesdropping - mDNSOpaque16 updateid; // Identifier to match update request and response -- also used when transferring records to Sleep Proxy - const domainname *zone; // the zone that is updated - ZoneData *nta; - struct tcpInfo_t *tcp; - NATTraversalInfo NATinfo; - mDNSBool SRVChanged; // temporarily deregistered service because its SRV target or port changed - mergeState_t mState; // Unicast Record Registrations merge state - mDNSu8 refreshCount; // Number of refreshes to the server - mStatus updateError; // Record update resulted in Error ? - - // uDNS_UpdateRecord support fields - // Do we really need all these in *addition* to NewRData and newrdlength above? - void *UpdateContext; // Context parameter for the update callback function - mDNSu16 OrigRDLen; // previously registered, being deleted - mDNSu16 InFlightRDLen; // currently being registered - mDNSu16 QueuedRDLen; // pending operation (re-transmitting if necessary) THEN register the queued update - RData *OrigRData; - RData *InFlightRData; - RData *QueuedRData; - - // Field Group 5: Large data objects go at the end - domainname namestorage; - RData rdatastorage; // Normally the storage is right here, except for oversized records - // rdatastorage MUST be the last thing in the structure -- when using oversized AuthRecords, extra bytes - // are appended after the end of the AuthRecord, logically augmenting the size of the rdatastorage - // DO NOT ADD ANY MORE FIELDS HERE - }; - -// IsLocalDomain alone is not sufficient to determine that a record is mDNS or uDNS. By default domain names within -// the "local" pseudo-TLD (and within the IPv4 and IPv6 link-local reverse mapping domains) are automatically treated -// as mDNS records, but it is also possible to force any record (even those not within one of the inherently local -// domains) to be handled as an mDNS record by setting the ForceMCast flag, or by setting a non-zero InterfaceID. -// For example, the reverse-mapping PTR record created in AdvertiseInterface sets the ForceMCast flag, since it points to -// a dot-local hostname, and therefore it would make no sense to register this record with a wide-area Unicast DNS server. -// The same applies to Sleep Proxy records, which we will answer for when queried via mDNS, but we never want to try -// to register them with a wide-area Unicast DNS server -- and we probably don't have the required credentials anyway. -// Currently we have no concept of a wide-area uDNS record scoped to a particular interface, so if the InterfaceID is -// nonzero we treat this the same as ForceMCast. -// Note: Question_uDNS(Q) is used in *only* one place -- on entry to mDNS_StartQuery_internal, to decide whether to set TargetQID. -// Everywhere else in the code, the determination of whether a question is unicast is made by checking to see if TargetQID is nonzero. -#define AuthRecord_uDNS(R) ((R)->resrec.InterfaceID == mDNSInterface_Any && !(R)->ForceMCast && !IsLocalDomain((R)->resrec.name)) -#define Question_uDNS(Q) ((Q)->InterfaceID == mDNSInterface_Unicast || \ - ((Q)->InterfaceID != mDNSInterface_LocalOnly && (Q)->InterfaceID != mDNSInterface_P2P && !(Q)->ForceMCast && !IsLocalDomain(&(Q)->qname))) - -#define RRLocalOnly(rr) ((rr)->ARType == AuthRecordLocalOnly || (rr)->ARType == AuthRecordP2P) - -#define RRAny(rr) ((rr)->ARType == AuthRecordAny || (rr)->ARType == AuthRecordAnyIncludeP2P) - -// Question (A or AAAA) that is suppressed currently because IPv4 or IPv6 address -// is not available locally for A or AAAA question respectively -#define QuerySuppressed(Q) ((Q)->SuppressUnusable && (Q)->SuppressQuery) - -#define PrivateQuery(Q) ((Q)->AuthInfo && (Q)->AuthInfo->AutoTunnel) - -// Normally we always lookup the cache and /etc/hosts before sending the query on the wire. For single label -// queries (A and AAAA) that are unqualified (indicated by AppendSearchDomains), we want to append search -// domains before we try them as such -#define ApplySearchDomainsFirst(q) ((q)->AppendSearchDomains && (CountLabels(&((q)->qname))) == 1) - -// Wrapper struct for Auth Records for higher-level code that cannot use the AuthRecord's ->next pointer field -typedef struct ARListElem - { - struct ARListElem *next; - AuthRecord ar; // Note: Must be last element of structure, to accomodate oversized AuthRecords - } ARListElem; - -struct CacheGroup_struct // Header object for a list of CacheRecords with the same name - { - CacheGroup *next; // Next CacheGroup object in this hash table bucket - mDNSu32 namehash; // Name-based (i.e. case insensitive) hash of name - CacheRecord *members; // List of CacheRecords with this same name - CacheRecord **rrcache_tail; // Tail end of that list - domainname *name; // Common name for all CacheRecords in this list - // Size to here is 20 bytes when compiling 32-bit; 40 bytes when compiling 64-bit - mDNSu8 namestorage[InlineCacheGroupNameSize]; - }; - - -struct CacheRecord_struct - { - CacheRecord *next; // Next in list; first element of structure for efficiency reasons - ResourceRecord resrec; // 36 bytes when compiling for 32-bit; 48 when compiling for 64-bit - - // Transient state for Cache Records - CacheRecord *NextInKAList; // Link to the next element in the chain of known answers to send - mDNSs32 TimeRcvd; // In platform time units - mDNSs32 DelayDelivery; // Set if we want to defer delivery of this answer to local clients - mDNSs32 NextRequiredQuery; // In platform time units - mDNSs32 LastUsed; // In platform time units - DNSQuestion *CRActiveQuestion; // Points to an active question referencing this answer. Can never point to a NewQuestion. - mDNSu32 UnansweredQueries; // Number of times we've issued a query for this record without getting an answer - mDNSs32 LastUnansweredTime; // In platform time units; last time we incremented UnansweredQueries -#if ENABLE_MULTI_PACKET_QUERY_SNOOPING - mDNSu32 MPUnansweredQ; // Multi-packet query handling: Number of times we've seen a query for this record - mDNSs32 MPLastUnansweredQT; // Multi-packet query handling: Last time we incremented MPUnansweredQ - mDNSu32 MPUnansweredKA; // Multi-packet query handling: Number of times we've seen this record in a KA list - mDNSBool MPExpectingKA; // Multi-packet query handling: Set when we increment MPUnansweredQ; allows one KA -#endif - CacheRecord *NextInCFList; // Set if this is in the list of records we just received with the cache flush bit set - // Size to here is 76 bytes when compiling 32-bit; 104 bytes when compiling 64-bit - RData_small smallrdatastorage; // Storage for small records is right here (4 bytes header + 68 bytes data = 72 bytes) - }; - -// Storage sufficient to hold either a CacheGroup header or a CacheRecord -// -- for best efficiency (to avoid wasted unused storage) they should be the same size -typedef union CacheEntity_union CacheEntity; -union CacheEntity_union { CacheEntity *next; CacheGroup cg; CacheRecord cr; }; - -typedef struct - { - CacheRecord r; - mDNSu8 _extradata[MaximumRDSize-InlineCacheRDSize]; // Glue on the necessary number of extra bytes - domainname namestorage; // Needs to go *after* the extra rdata bytes - } LargeCacheRecord; - -typedef struct HostnameInfo - { - struct HostnameInfo *next; - NATTraversalInfo natinfo; - domainname fqdn; - AuthRecord arv4; // registered IPv4 address record - AuthRecord arv6; // registered IPv6 address record - mDNSRecordCallback *StatusCallback; // callback to deliver success or error code to client layer - const void *StatusContext; // Client Context - } HostnameInfo; - -typedef struct ExtraResourceRecord_struct ExtraResourceRecord; -struct ExtraResourceRecord_struct - { - ExtraResourceRecord *next; - mDNSu32 ClientID; // Opaque ID field to be used by client to map an AddRecord call to a set of Extra records - AuthRecord r; - // Note: Add any additional fields *before* the AuthRecord in this structure, not at the end. - // In some cases clients can allocate larger chunks of memory and set r->rdata->MaxRDLength to indicate - // that this extra memory is available, which would result in any fields after the AuthRecord getting smashed - }; - -// Note: Within an mDNSServiceCallback mDNS all API calls are legal except mDNS_Init(), mDNS_Exit(), mDNS_Execute() -typedef void mDNSServiceCallback(mDNS *const m, ServiceRecordSet *const sr, mStatus result); - -// A ServiceRecordSet has no special meaning to the core code of the Multicast DNS protocol engine; -// it is just a convenience structure to group together the records that make up a standard service -// registration so that they can be allocted and deallocted together as a single memory object. -// It contains its own ServiceCallback+ServiceContext to report aggregate results up to the next layer of software above. -// It also contains: -// * the basic PTR/SRV/TXT triplet used to represent any DNS-SD service -// * the "_services" PTR record for service enumeration -// * the optional list of SubType PTR records -// * the optional list of additional records attached to the service set (e.g. iChat pictures) - -struct ServiceRecordSet_struct - { - // These internal state fields are used internally by mDNSCore; the client layer needn't be concerned with them. - // No fields need to be set up by the client prior to calling mDNS_RegisterService(); - // all required data is passed as parameters to that function. - mDNSServiceCallback *ServiceCallback; - void *ServiceContext; - mDNSBool Conflict; // Set if this record set was forcibly deregistered because of a conflict - - ExtraResourceRecord *Extras; // Optional list of extra AuthRecords attached to this service registration - mDNSu32 NumSubTypes; - AuthRecord *SubTypes; - AuthRecord RR_ADV; // e.g. _services._dns-sd._udp.local. PTR _printer._tcp.local. - AuthRecord RR_PTR; // e.g. _printer._tcp.local. PTR Name._printer._tcp.local. - AuthRecord RR_SRV; // e.g. Name._printer._tcp.local. SRV 0 0 port target - AuthRecord RR_TXT; // e.g. Name._printer._tcp.local. TXT PrintQueueName - // Don't add any fields after AuthRecord RR_TXT. - // This is where the implicit extra space goes if we allocate a ServiceRecordSet containing an oversized RR_TXT record - }; - -// *************************************************************************** -#if 0 -#pragma mark - -#pragma mark - Question structures -#endif - -// We record the last eight instances of each duplicate query -// This gives us v4/v6 on each of Ethernet, AirPort and Firewire, and two free slots "for future expansion" -// If the host has more active interfaces that this it is not fatal -- duplicate question suppression will degrade gracefully. -// Since we will still remember the last eight, the busiest interfaces will still get the effective duplicate question suppression. -#define DupSuppressInfoSize 8 - -typedef struct - { - mDNSs32 Time; - mDNSInterfaceID InterfaceID; - mDNSs32 Type; // v4 or v6? - } DupSuppressInfo; - -typedef enum - { - LLQ_InitialRequest = 1, - LLQ_SecondaryRequest = 2, - LLQ_Established = 3, - LLQ_Poll = 4 - } LLQ_State; - -// LLQ constants -#define kLLQ_Vers 1 -#define kLLQ_DefLease 7200 // 2 hours -#define kLLQ_MAX_TRIES 3 // retry an operation 3 times max -#define kLLQ_INIT_RESEND 2 // resend an un-ack'd packet after 2 seconds, then double for each additional -// LLQ Operation Codes -#define kLLQOp_Setup 1 -#define kLLQOp_Refresh 2 -#define kLLQOp_Event 3 - -// LLQ Errror Codes -enum - { - LLQErr_NoError = 0, - LLQErr_ServFull = 1, - LLQErr_Static = 2, - LLQErr_FormErr = 3, - LLQErr_NoSuchLLQ = 4, - LLQErr_BadVers = 5, - LLQErr_UnknownErr = 6 - }; - -enum { NoAnswer_Normal = 0, NoAnswer_Suspended = 1, NoAnswer_Fail = 2 }; - -#define HMAC_LEN 64 -#define HMAC_IPAD 0x36 -#define HMAC_OPAD 0x5c -#define MD5_LEN 16 - -#define AutoTunnelUnregistered(X) ( \ - (X)->AutoTunnelHostRecord.resrec.RecordType == kDNSRecordTypeUnregistered && \ - (X)->AutoTunnelDeviceInfo.resrec.RecordType == kDNSRecordTypeUnregistered && \ - (X)->AutoTunnelService. resrec.RecordType == kDNSRecordTypeUnregistered && \ - (X)->AutoTunnel6Record. resrec.RecordType == kDNSRecordTypeUnregistered ) - -// Internal data structure to maintain authentication information -typedef struct DomainAuthInfo - { - struct DomainAuthInfo *next; - mDNSs32 deltime; // If we're planning to delete this DomainAuthInfo, the time we want it deleted - const char* AutoTunnel; // If NULL, this is not an AutoTunnel DAI. Otherwise, this is prepended to the IPSec identifier - AuthRecord AutoTunnelHostRecord; // User-visible hostname; used as SRV target for AutoTunnel services - AuthRecord AutoTunnelTarget; // Opaque hostname of tunnel endpoint; used as SRV target for AutoTunnelService record - AuthRecord AutoTunnelDeviceInfo; // Device info of tunnel endpoint - AuthRecord AutoTunnelService; // Service record (possibly NAT-Mapped) of IKE daemon implementing tunnel endpoint - AuthRecord AutoTunnel6Record; // AutoTunnel AAAA Record obtained from Connectivityd - NATTraversalInfo AutoTunnelNAT; - domainname domain; - domainname keyname; - domainname hostname; - mDNSIPPort port; - char b64keydata[32]; - mDNSu8 keydata_ipad[HMAC_LEN]; // padded key for inner hash rounds - mDNSu8 keydata_opad[HMAC_LEN]; // padded key for outer hash rounds - } DomainAuthInfo; - -// Note: Within an mDNSQuestionCallback mDNS all API calls are legal except mDNS_Init(), mDNS_Exit(), mDNS_Execute() -typedef enum { QC_rmv = 0, QC_add = 1, QC_addnocache = 2 } QC_result; -typedef void mDNSQuestionCallback(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, QC_result AddRecord); - -#define NextQSendTime(Q) ((Q)->LastQTime + (Q)->ThisQInterval) -#define ActiveQuestion(Q) ((Q)->ThisQInterval > 0 && !(Q)->DuplicateOf) -#define TimeToSendThisQuestion(Q,time) (ActiveQuestion(Q) && (time) - NextQSendTime(Q) >= 0) - -struct DNSQuestion_struct - { - // Internal state fields. These are used internally by mDNSCore; the client layer needn't be concerned with them. - DNSQuestion *next; - mDNSu32 qnamehash; - mDNSs32 DelayAnswering; // Set if we want to defer answering this question until the cache settles - mDNSs32 LastQTime; // Last scheduled transmission of this Q on *all* applicable interfaces - mDNSs32 ThisQInterval; // LastQTime + ThisQInterval is the next scheduled transmission of this Q - // ThisQInterval > 0 for an active question; - // ThisQInterval = 0 for a suspended question that's still in the list - // ThisQInterval = -1 for a cancelled question (should not still be in list) - mDNSs32 ExpectUnicastResp;// Set when we send a query with the kDNSQClass_UnicastResponse bit set - mDNSs32 LastAnswerPktNum; // The sequence number of the last response packet containing an answer to this Q - mDNSu32 RecentAnswerPkts; // Number of answers since the last time we sent this query - mDNSu32 CurrentAnswers; // Number of records currently in the cache that answer this question - mDNSu32 LargeAnswers; // Number of answers with rdata > 1024 bytes - mDNSu32 UniqueAnswers; // Number of answers received with kDNSClass_UniqueRRSet bit set - mDNSInterfaceID FlappingInterface1;// Set when an interface goes away, to flag if remove events are delivered for this Q - mDNSInterfaceID FlappingInterface2;// Set when an interface goes away, to flag if remove events are delivered for this Q - DomainAuthInfo *AuthInfo; // Non-NULL if query is currently being done using Private DNS - DNSQuestion *DuplicateOf; - DNSQuestion *NextInDQList; - DupSuppressInfo DupSuppress[DupSuppressInfoSize]; - mDNSInterfaceID SendQNow; // The interface this query is being sent on right now - mDNSBool SendOnAll; // Set if we're sending this question on all active interfaces - mDNSu32 RequestUnicast; // Non-zero if we want to send query with kDNSQClass_UnicastResponse bit set - mDNSs32 LastQTxTime; // Last time this Q was sent on one (but not necessarily all) interfaces - mDNSu32 CNAMEReferrals; // Count of how many CNAME redirections we've done - mDNSBool SuppressQuery; // This query should be suppressed and not sent on the wire - mDNSu8 LOAddressAnswers; // Number of answers from the local only auth records that are - // answering A, AAAA and CNAME (/etc/hosts) - mDNSu8 WakeOnResolveCount; // Number of wakes that should be sent on resolve - mDNSs32 StopTime; // Time this question should be stopped by giving them a negative answer - - // Wide Area fields. These are used internally by the uDNS core - UDPSocket *LocalSocket; - mDNSBool deliverAddEvents; // Change in DNSSserver requiring to deliver ADD events - DNSServer *qDNSServer; // Caching server for this query (in the absence of an SRV saying otherwise) - mDNSOpaque64 validDNSServers; // Valid DNSServers for this question - mDNSu16 noServerResponse; // At least one server did not respond. - mDNSu16 triedAllServersOnce; // Tried all DNS servers once - mDNSu8 unansweredQueries;// The number of unanswered queries to this server - - ZoneData *nta; // Used for getting zone data for private or LLQ query - mDNSAddr servAddr; // Address and port learned from _dns-llq, _dns-llq-tls or _dns-query-tls SRV query - mDNSIPPort servPort; - struct tcpInfo_t *tcp; - mDNSIPPort tcpSrcPort; // Local Port TCP packet received on;need this as tcp struct is disposed - // by tcpCallback before calling into mDNSCoreReceive - mDNSu8 NoAnswer; // Set if we want to suppress answers until tunnel setup has completed - - // LLQ-specific fields. These fields are only meaningful when LongLived flag is set - LLQ_State state; - mDNSu32 ReqLease; // seconds (relative) - mDNSs32 expire; // ticks (absolute) - mDNSs16 ntries; // for UDP: the number of packets sent for this LLQ state - // for TCP: there is some ambiguity in the use of this variable, but in general, it is - // the number of TCP/TLS connection attempts for this LLQ state, or - // the number of packets sent for this TCP/TLS connection - mDNSOpaque64 id; - - // Client API fields: The client must set up these fields *before* calling mDNS_StartQuery() - mDNSInterfaceID InterfaceID; // Non-zero if you want to issue queries only on a single specific IP interface - mDNSAddr Target; // Non-zero if you want to direct queries to a specific unicast target address - mDNSIPPort TargetPort; // Must be set if Target is set - mDNSOpaque16 TargetQID; // Must be set if Target is set - domainname qname; - mDNSu16 qtype; - mDNSu16 qclass; - mDNSBool LongLived; // Set by client for calls to mDNS_StartQuery to indicate LLQs to unicast layer. - mDNSBool ExpectUnique; // Set by client if it's expecting unique RR(s) for this question, not shared RRs - mDNSBool ForceMCast; // Set by client to force mDNS query, even for apparently uDNS names - mDNSBool ReturnIntermed; // Set by client to request callbacks for intermediate CNAME/NXDOMAIN results - mDNSBool SuppressUnusable; // Set by client to suppress unusable queries to be sent on the wire - mDNSBool RetryWithSearchDomains; // Retry with search domains if there is no entry in the cache or AuthRecords - mDNSu8 TimeoutQuestion; // Timeout this question if there is no reply in configured time - mDNSu8 WakeOnResolve; // Send wakeup on resolve - mDNSs8 SearchListIndex; // Index into SearchList; Used by the client layer but not touched by core - mDNSs8 AppendSearchDomains; // Search domains can be appended for this query - mDNSs8 AppendLocalSearchDomains; // Search domains ending in .local can be appended for this query - domainname *qnameOrig; // Copy of the original question name if it is not fully qualified - mDNSQuestionCallback *QuestionCallback; - void *QuestionContext; - }; - -typedef struct - { - // Client API fields: The client must set up name and InterfaceID *before* calling mDNS_StartResolveService() - // When the callback is invoked, ip, port, TXTlen and TXTinfo will have been filled in with the results learned from the network. - domainname name; - mDNSInterfaceID InterfaceID; // ID of the interface the response was received on - mDNSAddr ip; // Remote (destination) IP address where this service can be accessed - mDNSIPPort port; // Port where this service can be accessed - mDNSu16 TXTlen; - mDNSu8 TXTinfo[2048]; // Additional demultiplexing information (e.g. LPR queue name) - } ServiceInfo; - -// Note: Within an mDNSServiceInfoQueryCallback mDNS all API calls are legal except mDNS_Init(), mDNS_Exit(), mDNS_Execute() -typedef struct ServiceInfoQuery_struct ServiceInfoQuery; -typedef void mDNSServiceInfoQueryCallback(mDNS *const m, ServiceInfoQuery *query); -struct ServiceInfoQuery_struct - { - // Internal state fields. These are used internally by mDNSCore; the client layer needn't be concerned with them. - // No fields need to be set up by the client prior to calling mDNS_StartResolveService(); - // all required data is passed as parameters to that function. - // The ServiceInfoQuery structure memory is working storage for mDNSCore to discover the requested information - // and place it in the ServiceInfo structure. After the client has called mDNS_StopResolveService(), it may - // dispose of the ServiceInfoQuery structure while retaining the results in the ServiceInfo structure. - DNSQuestion qSRV; - DNSQuestion qTXT; - DNSQuestion qAv4; - DNSQuestion qAv6; - mDNSu8 GotSRV; - mDNSu8 GotTXT; - mDNSu8 GotADD; - mDNSu32 Answers; - ServiceInfo *info; - mDNSServiceInfoQueryCallback *ServiceInfoQueryCallback; - void *ServiceInfoQueryContext; - }; - -typedef enum { ZoneServiceUpdate, ZoneServiceQuery, ZoneServiceLLQ } ZoneService; - -typedef void ZoneDataCallback(mDNS *const m, mStatus err, const ZoneData *result); - -struct ZoneData_struct - { - domainname ChildName; // Name for which we're trying to find the responsible server - ZoneService ZoneService; // Which service we're seeking for this zone (update, query, or LLQ) - domainname *CurrentSOA; // Points to somewhere within ChildName - domainname ZoneName; // Discovered result: Left-hand-side of SOA record - mDNSu16 ZoneClass; // Discovered result: DNS Class from SOA record - domainname Host; // Discovered result: Target host from SRV record - mDNSIPPort Port; // Discovered result: Update port, query port, or LLQ port from SRV record - mDNSAddr Addr; // Discovered result: Address of Target host from SRV record - mDNSBool ZonePrivate; // Discovered result: Does zone require encrypted queries? - ZoneDataCallback *ZoneDataCallback; // Caller-specified function to be called upon completion - void *ZoneDataContext; - DNSQuestion question; // Storage for any active question - }; - -extern ZoneData *StartGetZoneData(mDNS *const m, const domainname *const name, const ZoneService target, ZoneDataCallback callback, void *callbackInfo); -extern void CancelGetZoneData(mDNS *const m, ZoneData *nta); -extern mDNSBool IsGetZoneDataQuestion(DNSQuestion *q); - -typedef struct DNameListElem - { - struct DNameListElem *next; - mDNSu32 uid; - domainname name; - } DNameListElem; - -#if APPLE_OSX_mDNSResponder -// Different states that we go through locating the peer -#define TC_STATE_AAAA_PEER 0x000000001 /* Peer's BTMM IPv6 address */ -#define TC_STATE_AAAA_PEER_RELAY 0x000000002 /* Peer's IPv6 Relay address */ -#define TC_STATE_SRV_PEER 0x000000003 /* Peer's SRV Record corresponding to IPv4 address */ -#define TC_STATE_ADDR_PEER 0x000000004 /* Peer's IPv4 address */ - -typedef struct ClientTunnel - { - struct ClientTunnel *next; - const char *prefix; - domainname dstname; - mDNSBool MarkedForDeletion; - mDNSv6Addr loc_inner; - mDNSv4Addr loc_outer; - mDNSv6Addr loc_outer6; - mDNSv6Addr rmt_inner; - mDNSv4Addr rmt_outer; - mDNSv6Addr rmt_outer6; - mDNSIPPort rmt_outer_port; - mDNSu16 tc_state; - DNSQuestion q; - } ClientTunnel; -#endif - -// *************************************************************************** -#if 0 -#pragma mark - -#pragma mark - NetworkInterfaceInfo_struct -#endif - -typedef struct NetworkInterfaceInfo_struct NetworkInterfaceInfo; - -// A NetworkInterfaceInfo_struct serves two purposes: -// 1. It holds the address, PTR and HINFO records to advertise a given IP address on a given physical interface -// 2. It tells mDNSCore which physical interfaces are available; each physical interface has its own unique InterfaceID. -// Since there may be multiple IP addresses on a single physical interface, -// there may be multiple NetworkInterfaceInfo_structs with the same InterfaceID. -// In this case, to avoid sending the same packet n times, when there's more than one -// struct with the same InterfaceID, mDNSCore picks one member of the set to be the -// active representative of the set; all others have the 'InterfaceActive' flag unset. - -struct NetworkInterfaceInfo_struct - { - // Internal state fields. These are used internally by mDNSCore; the client layer needn't be concerned with them. - NetworkInterfaceInfo *next; - - mDNSu8 InterfaceActive; // Set if interface is sending & receiving packets (see comment above) - mDNSu8 IPv4Available; // If InterfaceActive, set if v4 available on this InterfaceID - mDNSu8 IPv6Available; // If InterfaceActive, set if v6 available on this InterfaceID - - DNSQuestion NetWakeBrowse; - DNSQuestion NetWakeResolve[3]; // For fault-tolerance, we try up to three Sleep Proxies - mDNSAddr SPSAddr[3]; - mDNSIPPort SPSPort[3]; - mDNSs32 NextSPSAttempt; // -1 if we're not currently attempting to register with any Sleep Proxy - mDNSs32 NextSPSAttemptTime; - - // Standard AuthRecords that every Responder host should have (one per active IP address) - AuthRecord RR_A; // 'A' or 'AAAA' (address) record for our ".local" name - AuthRecord RR_PTR; // PTR (reverse lookup) record - AuthRecord RR_HINFO; - - // Client API fields: The client must set up these fields *before* calling mDNS_RegisterInterface() - mDNSInterfaceID InterfaceID; // Identifies physical interface; MUST NOT be 0, -1, or -2 - mDNSAddr ip; // The IPv4 or IPv6 address to advertise - mDNSAddr mask; - mDNSEthAddr MAC; - char ifname[64]; // Windows uses a GUID string for the interface name, which doesn't fit in 16 bytes - mDNSu8 Advertise; // False if you are only searching on this interface - mDNSu8 McastTxRx; // Send/Receive multicast on this { InterfaceID, address family } ? - mDNSu8 NetWake; // Set if Wake-On-Magic-Packet is enabled on this interface - mDNSu8 Loopback; // Set if this is the loopback interface - }; - -#define SLE_DELETE 0x00000001 -#define SLE_WAB_QUERY_STARTED 0x00000002 - -typedef struct SearchListElem - { - struct SearchListElem *next; - domainname domain; - int flag; - mDNSInterfaceID InterfaceID; - DNSQuestion BrowseQ; - DNSQuestion DefBrowseQ; - DNSQuestion AutomaticBrowseQ; - DNSQuestion RegisterQ; - DNSQuestion DefRegisterQ; - int numCfAnswers; - ARListElem *AuthRecs; - } SearchListElem; - -// For domain enumeration and automatic browsing -// This is the user's DNS search list. -// In each of these domains we search for our special pointer records (lb._dns-sd._udp., etc.) -// to discover recommended domains for domain enumeration (browse, default browse, registration, -// default registration) and possibly one or more recommended automatic browsing domains. -extern SearchListElem *SearchList; // This really ought to be part of mDNS_struct -- SC - -// *************************************************************************** -#if 0 -#pragma mark - -#pragma mark - Main mDNS object, used to hold all the mDNS state -#endif - -typedef void mDNSCallback(mDNS *const m, mStatus result); - -#define CACHE_HASH_SLOTS 499 - -enum // Bit flags -- i.e. values should be 1, 2, 4, 8, etc. - { - mDNS_KnownBug_LimitedIPv6 = 1, - mDNS_KnownBug_LossySyslog = 2 // - }; - -enum - { - SleepState_Awake = 0, - SleepState_Transferring = 1, - SleepState_Sleeping = 2 - }; - -struct mDNS_struct - { - // Internal state fields. These hold the main internal state of mDNSCore; - // the client layer needn't be concerned with them. - // No fields need to be set up by the client prior to calling mDNS_Init(); - // all required data is passed as parameters to that function. - - mDNS_PlatformSupport *p; // Pointer to platform-specific data of indeterminite size - mDNSu32 KnownBugs; - mDNSBool CanReceiveUnicastOn5353; - mDNSBool AdvertiseLocalAddresses; - mDNSBool DivertMulticastAdvertisements; // from interfaces that do not advertise local addresses to local-only - mStatus mDNSPlatformStatus; - mDNSIPPort UnicastPort4; - mDNSIPPort UnicastPort6; - mDNSEthAddr PrimaryMAC; // Used as unique host ID - mDNSCallback *MainCallback; - void *MainContext; - - // For debugging: To catch and report locking failures - mDNSu32 mDNS_busy; // Incremented between mDNS_Lock/mDNS_Unlock section - mDNSu32 mDNS_reentrancy; // Incremented when calling a client callback - mDNSu8 lock_rrcache; // For debugging: Set at times when these lists may not be modified - mDNSu8 lock_Questions; - mDNSu8 lock_Records; -#ifndef MaxMsg - #define MaxMsg 160 -#endif - char MsgBuffer[MaxMsg]; // Temp storage used while building error log messages - - // Task Scheduling variables - mDNSs32 timenow_adjust; // Correction applied if we ever discover time went backwards - mDNSs32 timenow; // The time that this particular activation of the mDNS code started - mDNSs32 timenow_last; // The time the last time we ran - mDNSs32 NextScheduledEvent; // Derived from values below - mDNSs32 ShutdownTime; // Set when we're shutting down; allows us to skip some unnecessary steps - mDNSs32 SuppressSending; // Don't send local-link mDNS packets during this time - mDNSs32 NextCacheCheck; // Next time to refresh cache record before it expires - mDNSs32 NextScheduledQuery; // Next time to send query in its exponential backoff sequence - mDNSs32 NextScheduledProbe; // Next time to probe for new authoritative record - mDNSs32 NextScheduledResponse; // Next time to send authoritative record(s) in responses - mDNSs32 NextScheduledNATOp; // Next time to send NAT-traversal packets - mDNSs32 NextScheduledSPS; // Next time to purge expiring Sleep Proxy records - mDNSs32 RandomQueryDelay; // For de-synchronization of query packets on the wire - mDNSu32 RandomReconfirmDelay; // For de-synchronization of reconfirmation queries on the wire - mDNSs32 PktNum; // Unique sequence number assigned to each received packet - mDNSu8 LocalRemoveEvents; // Set if we may need to deliver remove events for local-only questions and/or local-only records - mDNSu8 SleepState; // Set if we're sleeping - mDNSu8 SleepSeqNum; // "Epoch number" of our current period of wakefulness - mDNSu8 SystemWakeOnLANEnabled; // Set if we want to register with a Sleep Proxy before going to sleep - mDNSu8 SentSleepProxyRegistration;// Set if we registered (or tried to register) with a Sleep Proxy - mDNSu8 SystemSleepOnlyIfWakeOnLAN;// Set if we may only sleep if we managed to register with a Sleep Proxy - mDNSs32 AnnounceOwner; // After waking from sleep, include OWNER option in packets until this time - mDNSs32 DelaySleep; // To inhibit re-sleeping too quickly right after wake - mDNSs32 SleepLimit; // Time window to allow deregistrations, etc., - // during which underying platform layer should inhibit system sleep - mDNSs32 NextScheduledSPRetry; // Time next sleep proxy registration action is required. - // Only valid if SleepLimit is nonzero and DelaySleep is zero. - - mDNSs32 NextScheduledStopTime; // Next time to stop a question - - // These fields only required for mDNS Searcher... - DNSQuestion *Questions; // List of all registered questions, active and inactive - DNSQuestion *NewQuestions; // Fresh questions not yet answered from cache - DNSQuestion *CurrentQuestion; // Next question about to be examined in AnswerLocalQuestions() - DNSQuestion *LocalOnlyQuestions; // Questions with InterfaceID set to mDNSInterface_LocalOnly or mDNSInterface_P2P - DNSQuestion *NewLocalOnlyQuestions; // Fresh local-only or P2P questions not yet answered - DNSQuestion *RestartQuestion; // Questions that are being restarted (stop followed by start) - mDNSu32 rrcache_size; // Total number of available cache entries - mDNSu32 rrcache_totalused; // Number of cache entries currently occupied - mDNSu32 rrcache_active; // Number of cache entries currently occupied by records that answer active questions - mDNSu32 rrcache_report; - CacheEntity *rrcache_free; - CacheGroup *rrcache_hash[CACHE_HASH_SLOTS]; - mDNSs32 rrcache_nextcheck[CACHE_HASH_SLOTS]; - - AuthHash rrauth; - - // Fields below only required for mDNS Responder... - domainlabel nicelabel; // Rich text label encoded using canonically precomposed UTF-8 - domainlabel hostlabel; // Conforms to RFC 1034 "letter-digit-hyphen" ARPANET host name rules - domainname MulticastHostname; // Fully Qualified "dot-local" Host Name, e.g. "Foo.local." - UTF8str255 HIHardware; - UTF8str255 HISoftware; - AuthRecord DeviceInfo; - AuthRecord *ResourceRecords; - AuthRecord *DuplicateRecords; // Records currently 'on hold' because they are duplicates of existing records - AuthRecord *NewLocalRecords; // Fresh AuthRecords (public) not yet delivered to our local-only questions - AuthRecord *CurrentRecord; // Next AuthRecord about to be examined - mDNSBool NewLocalOnlyRecords; // Fresh AuthRecords (local only) not yet delivered to our local questions - NetworkInterfaceInfo *HostInterfaces; - mDNSs32 ProbeFailTime; - mDNSu32 NumFailedProbes; - mDNSs32 SuppressProbes; - - // Unicast-specific data - mDNSs32 NextuDNSEvent; // uDNS next event - mDNSs32 NextSRVUpdate; // Time to perform delayed update - - DNSServer *DNSServers; // list of DNS servers - McastResolver *McastResolvers; // list of Mcast Resolvers - - mDNSAddr Router; - mDNSAddr AdvertisedV4; // IPv4 address pointed to by hostname - mDNSAddr AdvertisedV6; // IPv6 address pointed to by hostname - - DomainAuthInfo *AuthInfoList; // list of domains requiring authentication for updates - - DNSQuestion ReverseMap; // Reverse-map query to find static hostname for service target - DNSQuestion AutomaticBrowseDomainQ; - domainname StaticHostname; // Current answer to reverse-map query - domainname FQDN; - HostnameInfo *Hostnames; // List of registered hostnames + hostname metadata - mDNSv6Addr AutoTunnelHostAddr; // IPv6 address advertised for AutoTunnel services on this machine - mDNSBool AutoTunnelHostAddrActive; - // AutoTunnel Relay address has two distinct uses - // AutoTunnelRelayAddrIn: If non-zero, it means that this host can be reached (inbound connection) through the relay - // AutoTunnelRelayAddrOut: If non-zero, it means that this host can use the relay to reach (outbound connection) the - // other hosts through the relay - mDNSv6Addr AutoTunnelRelayAddrIn; - mDNSv6Addr AutoTunnelRelayAddrOut; - domainlabel AutoTunnelLabel; // Used to construct hostname for *IPv4* address of tunnel endpoints - - mDNSBool StartWABQueries; // Start WAB queries for the purpose of domain enumeration - mDNSBool RegisterAutoTunnel6; - - // NAT-Traversal fields - NATTraversalInfo LLQNAT; // Single shared NAT Traversal to receive inbound LLQ notifications - NATTraversalInfo *NATTraversals; - NATTraversalInfo *CurrentNATTraversal; - mDNSs32 retryIntervalGetAddr; // delta between time sent and retry - mDNSs32 retryGetAddr; // absolute time when we retry - mDNSv4Addr ExternalAddress; - - UDPSocket *NATMcastRecvskt; // For receiving NAT-PMP AddrReply multicasts from router on port 5350 - mDNSu32 LastNATupseconds; // NAT engine uptime in seconds, from most recent NAT packet - mDNSs32 LastNATReplyLocalTime; // Local time in ticks when most recent NAT packet was received - mDNSu16 LastNATMapResultCode; // Most recent error code for mappings - - tcpLNTInfo tcpAddrInfo; // legacy NAT traversal TCP connection info for external address - tcpLNTInfo tcpDeviceInfo; // legacy NAT traversal TCP connection info for device info - tcpLNTInfo *tcpInfoUnmapList; // list of pending unmap requests - mDNSInterfaceID UPnPInterfaceID; - UDPSocket *SSDPSocket; // For SSDP request/response - mDNSBool SSDPWANPPPConnection; // whether we should send the SSDP query for WANIPConnection or WANPPPConnection - mDNSIPPort UPnPRouterPort; // port we send discovery messages to - mDNSIPPort UPnPSOAPPort; // port we send SOAP messages to - mDNSu8 *UPnPRouterURL; // router's URL string - mDNSBool UPnPWANPPPConnection; // whether we're using WANIPConnection or WANPPPConnection - mDNSu8 *UPnPSOAPURL; // router's SOAP control URL string - mDNSu8 *UPnPRouterAddressString; // holds both the router's address and port - mDNSu8 *UPnPSOAPAddressString; // holds both address and port for SOAP messages - - // Sleep Proxy Server fields - mDNSu8 SPSType; // 0 = off, 10-99 encodes desirability metric - mDNSu8 SPSPortability; // 10-99 - mDNSu8 SPSMarginalPower; // 10-99 - mDNSu8 SPSTotalPower; // 10-99 - mDNSu8 SPSState; // 0 = off, 1 = running, 2 = shutting down, 3 = suspended during sleep - mDNSInterfaceID SPSProxyListChanged; - UDPSocket *SPSSocket; - ServiceRecordSet SPSRecords; - mDNSQuestionCallback *SPSBrowseCallback; // So the platform layer can do something useful with SPS browse results - int ProxyRecords; // Total number of records we're holding as proxy - #define MAX_PROXY_RECORDS 10000 /* DOS protection: 400 machines at 25 records each */ - -#if APPLE_OSX_mDNSResponder - ClientTunnel *TunnelClients; - uuid_t asl_uuid; // uuid for ASL logging - void *WCF; -#endif - - // Fixed storage, to avoid creating large objects on the stack - // The imsg is declared as a union with a pointer type to enforce CPU-appropriate alignment - union { DNSMessage m; void *p; } imsg; // Incoming message received from wire - DNSMessage omsg; // Outgoing message we're building - LargeCacheRecord rec; // Resource Record extracted from received message - }; - -#define FORALL_CACHERECORDS(SLOT,CG,CR) \ - for ((SLOT) = 0; (SLOT) < CACHE_HASH_SLOTS; (SLOT)++) \ - for ((CG)=m->rrcache_hash[(SLOT)]; (CG); (CG)=(CG)->next) \ - for ((CR) = (CG)->members; (CR); (CR)=(CR)->next) - -// *************************************************************************** -#if 0 -#pragma mark - -#pragma mark - Useful Static Constants -#endif - -extern const mDNSInterfaceID mDNSInterface_Any; // Zero -extern const mDNSInterfaceID mDNSInterface_LocalOnly; // Special value -extern const mDNSInterfaceID mDNSInterface_Unicast; // Special value -extern const mDNSInterfaceID mDNSInterfaceMark; // Special value -extern const mDNSInterfaceID mDNSInterface_P2P; // Special value - -extern const mDNSIPPort DiscardPort; -extern const mDNSIPPort SSHPort; -extern const mDNSIPPort UnicastDNSPort; -extern const mDNSIPPort SSDPPort; -extern const mDNSIPPort IPSECPort; -extern const mDNSIPPort NSIPCPort; -extern const mDNSIPPort NATPMPAnnouncementPort; -extern const mDNSIPPort NATPMPPort; -extern const mDNSIPPort DNSEXTPort; -extern const mDNSIPPort MulticastDNSPort; -extern const mDNSIPPort LoopbackIPCPort; -extern const mDNSIPPort PrivateDNSPort; - -extern const OwnerOptData zeroOwner; - -extern const mDNSIPPort zeroIPPort; -extern const mDNSv4Addr zerov4Addr; -extern const mDNSv6Addr zerov6Addr; -extern const mDNSEthAddr zeroEthAddr; -extern const mDNSv4Addr onesIPv4Addr; -extern const mDNSv6Addr onesIPv6Addr; -extern const mDNSEthAddr onesEthAddr; -extern const mDNSAddr zeroAddr; - -extern const mDNSv4Addr AllDNSAdminGroup; -extern const mDNSv4Addr AllHosts_v4; -extern const mDNSv6Addr AllHosts_v6; -extern const mDNSv6Addr NDP_prefix; -extern const mDNSEthAddr AllHosts_v6_Eth; -extern const mDNSAddr AllDNSLinkGroup_v4; -extern const mDNSAddr AllDNSLinkGroup_v6; - -extern const mDNSOpaque16 zeroID; -extern const mDNSOpaque16 onesID; -extern const mDNSOpaque16 QueryFlags; -extern const mDNSOpaque16 uQueryFlags; -extern const mDNSOpaque16 ResponseFlags; -extern const mDNSOpaque16 UpdateReqFlags; -extern const mDNSOpaque16 UpdateRespFlags; - -extern const mDNSOpaque64 zeroOpaque64; - -extern mDNSBool StrictUnicastOrdering; -extern mDNSu8 NumUnicastDNSServers; - -#define localdomain (*(const domainname *)"\x5" "local") -#define DeviceInfoName (*(const domainname *)"\xC" "_device-info" "\x4" "_tcp") -#define SleepProxyServiceType (*(const domainname *)"\xC" "_sleep-proxy" "\x4" "_udp") - -// *************************************************************************** -#if 0 -#pragma mark - -#pragma mark - Inline functions -#endif - -#if (defined(_MSC_VER)) - #define mDNSinline static __inline -#elif ((__GNUC__ > 2) || ((__GNUC__ == 2) && (__GNUC_MINOR__ >= 9))) - #define mDNSinline static inline -#endif - -// If we're not doing inline functions, then this header needs to have the extern declarations -#if !defined(mDNSinline) -extern mDNSs32 NonZeroTime(mDNSs32 t); -extern mDNSu16 mDNSVal16(mDNSOpaque16 x); -extern mDNSOpaque16 mDNSOpaque16fromIntVal(mDNSu16 v); -#endif - -// If we're compiling the particular C file that instantiates our inlines, then we -// define "mDNSinline" (to empty string) so that we generate code in the following section -#if (!defined(mDNSinline) && mDNS_InstantiateInlines) -#define mDNSinline -#endif - -#ifdef mDNSinline - -mDNSinline mDNSs32 NonZeroTime(mDNSs32 t) { if (t) return(t); else return(1); } - -mDNSinline mDNSu16 mDNSVal16(mDNSOpaque16 x) { return((mDNSu16)((mDNSu16)x.b[0] << 8 | (mDNSu16)x.b[1])); } - -mDNSinline mDNSOpaque16 mDNSOpaque16fromIntVal(mDNSu16 v) - { - mDNSOpaque16 x; - x.b[0] = (mDNSu8)(v >> 8); - x.b[1] = (mDNSu8)(v & 0xFF); - return(x); - } - -#endif - -// *************************************************************************** -#if 0 -#pragma mark - -#pragma mark - Main Client Functions -#endif - -// Every client should call mDNS_Init, passing in storage for the mDNS object and the mDNS_PlatformSupport object. -// -// Clients that are only advertising services should use mDNS_Init_NoCache and mDNS_Init_ZeroCacheSize. -// Clients that plan to perform queries (mDNS_StartQuery, mDNS_StartBrowse, mDNS_StartResolveService, etc.) -// need to provide storage for the resource record cache, or the query calls will return 'mStatus_NoCache'. -// The rrcachestorage parameter is the address of memory for the resource record cache, and -// the rrcachesize parameter is the number of entries in the CacheRecord array passed in. -// (i.e. the size of the cache memory needs to be sizeof(CacheRecord) * rrcachesize). -// OS X 10.3 Panther uses an initial cache size of 64 entries, and then mDNSCore sends an -// mStatus_GrowCache message if it needs more. -// -// Most clients should use mDNS_Init_AdvertiseLocalAddresses. This causes mDNSCore to automatically -// create the correct address records for all the hosts interfaces. If you plan to advertise -// services being offered by the local machine, this is almost always what you want. -// There are two cases where you might use mDNS_Init_DontAdvertiseLocalAddresses: -// 1. A client-only device, that browses for services but doesn't advertise any of its own. -// 2. A proxy-registration service, that advertises services being offered by other machines, and takes -// the appropriate steps to manually create the correct address records for those other machines. -// In principle, a proxy-like registration service could manually create address records for its own machine too, -// but this would be pointless extra effort when using mDNS_Init_AdvertiseLocalAddresses does that for you. -// -// Note that a client-only device that wishes to prohibit multicast advertisements (e.g. from -// higher-layer API calls) must also set DivertMulticastAdvertisements in the mDNS structure and -// advertise local address(es) on a loopback interface. -// -// When mDNS has finished setting up the client's callback is called -// A client can also spin and poll the mDNSPlatformStatus field to see when it changes from mStatus_Waiting to mStatus_NoError -// -// Call mDNS_StartExit to tidy up before exiting -// Because exiting may be an asynchronous process (e.g. if unicast records need to be deregistered) -// client layer may choose to wait until mDNS_ExitNow() returns true before calling mDNS_FinalExit(). -// -// Call mDNS_Register with a completed AuthRecord object to register a resource record -// If the resource record type is kDNSRecordTypeUnique (or kDNSknownunique) then if a conflicting resource record is discovered, -// the resource record's mDNSRecordCallback will be called with error code mStatus_NameConflict. The callback should deregister -// the record, and may then try registering the record again after picking a new name (e.g. by automatically appending a number). -// Following deregistration, the RecordCallback will be called with result mStatus_MemFree to signal that it is safe to deallocate -// the record's storage (memory must be freed asynchronously to allow for goodbye packets and dynamic update deregistration). -// -// Call mDNS_StartQuery to initiate a query. mDNS will proceed to issue Multicast DNS query packets, and any time a response -// is received containing a record which matches the question, the DNSQuestion's mDNSAnswerCallback function will be called -// Call mDNS_StopQuery when no more answers are required -// -// Care should be taken on multi-threaded or interrupt-driven environments. -// The main mDNS routines call mDNSPlatformLock() on entry and mDNSPlatformUnlock() on exit; -// each platform layer needs to implement these appropriately for its respective platform. -// For example, if the support code on a particular platform implements timer callbacks at interrupt time, then -// mDNSPlatformLock/Unlock need to disable interrupts or do similar concurrency control to ensure that the mDNS -// code is not entered by an interrupt-time timer callback while in the middle of processing a client call. - -extern mStatus mDNS_Init (mDNS *const m, mDNS_PlatformSupport *const p, - CacheEntity *rrcachestorage, mDNSu32 rrcachesize, - mDNSBool AdvertiseLocalAddresses, - mDNSCallback *Callback, void *Context); -// See notes above on use of NoCache/ZeroCacheSize -#define mDNS_Init_NoCache mDNSNULL -#define mDNS_Init_ZeroCacheSize 0 -// See notes above on use of Advertise/DontAdvertiseLocalAddresses -#define mDNS_Init_AdvertiseLocalAddresses mDNStrue -#define mDNS_Init_DontAdvertiseLocalAddresses mDNSfalse -#define mDNS_Init_NoInitCallback mDNSNULL -#define mDNS_Init_NoInitCallbackContext mDNSNULL - -extern void mDNS_ConfigChanged(mDNS *const m); -extern void mDNS_GrowCache (mDNS *const m, CacheEntity *storage, mDNSu32 numrecords); -extern void mDNS_GrowAuth (mDNS *const m, AuthEntity *storage, mDNSu32 numrecords); -extern void mDNS_StartExit (mDNS *const m); -extern void mDNS_FinalExit (mDNS *const m); -#define mDNS_Close(m) do { mDNS_StartExit(m); mDNS_FinalExit(m); } while(0) -#define mDNS_ExitNow(m, now) ((now) - (m)->ShutdownTime >= 0 || (!(m)->ResourceRecords)) - -extern mDNSs32 mDNS_Execute (mDNS *const m); - -extern mStatus mDNS_Register (mDNS *const m, AuthRecord *const rr); -extern mStatus mDNS_Update (mDNS *const m, AuthRecord *const rr, mDNSu32 newttl, - const mDNSu16 newrdlength, RData *const newrdata, mDNSRecordUpdateCallback *Callback); -extern mStatus mDNS_Deregister(mDNS *const m, AuthRecord *const rr); - -extern mStatus mDNS_StartQuery(mDNS *const m, DNSQuestion *const question); -extern mStatus mDNS_StopQuery (mDNS *const m, DNSQuestion *const question); -extern mStatus mDNS_StopQueryWithRemoves(mDNS *const m, DNSQuestion *const question); -extern mStatus mDNS_Reconfirm (mDNS *const m, CacheRecord *const cacherr); -extern mStatus mDNS_ReconfirmByValue(mDNS *const m, ResourceRecord *const rr); -extern void mDNS_PurgeCacheResourceRecord(mDNS *const m, CacheRecord *rr); -extern mDNSs32 mDNS_TimeNow(const mDNS *const m); - -extern mStatus mDNS_StartNATOperation(mDNS *const m, NATTraversalInfo *traversal); -extern mStatus mDNS_StopNATOperation(mDNS *const m, NATTraversalInfo *traversal); -extern mStatus mDNS_StopNATOperation_internal(mDNS *m, NATTraversalInfo *traversal); - -extern DomainAuthInfo *GetAuthInfoForName(mDNS *m, const domainname *const name); - -extern void mDNS_UpdateAllowSleep(mDNS *const m); - -// *************************************************************************** -#if 0 -#pragma mark - -#pragma mark - Platform support functions that are accessible to the client layer too -#endif - -extern mDNSs32 mDNSPlatformOneSecond; - -// *************************************************************************** -#if 0 -#pragma mark - -#pragma mark - General utility and helper functions -#endif - -// mDNS_Dereg_normal is used for most calls to mDNS_Deregister_internal -// mDNS_Dereg_rapid is used to send one goodbye instead of three, when we want the memory available for reuse sooner -// mDNS_Dereg_conflict is used to indicate that this record is being forcibly deregistered because of a conflict -// mDNS_Dereg_repeat is used when cleaning up, for records that may have already been forcibly deregistered -typedef enum { mDNS_Dereg_normal, mDNS_Dereg_rapid, mDNS_Dereg_conflict, mDNS_Dereg_repeat } mDNS_Dereg_type; - -// mDNS_RegisterService is a single call to register the set of resource records associated with a given named service. -// -// mDNS_StartResolveService is single call which is equivalent to multiple calls to mDNS_StartQuery, -// to find the IP address, port number, and demultiplexing information for a given named service. -// As with mDNS_StartQuery, it executes asynchronously, and calls the ServiceInfoQueryCallback when the answer is -// found. After the service is resolved, the client should call mDNS_StopResolveService to complete the transaction. -// The client can also call mDNS_StopResolveService at any time to abort the transaction. -// -// mDNS_AddRecordToService adds an additional record to a Service Record Set. This record may be deregistered -// via mDNS_RemoveRecordFromService, or by deregistering the service. mDNS_RemoveRecordFromService is passed a -// callback to free the memory associated with the extra RR when it is safe to do so. The ExtraResourceRecord -// object can be found in the record's context pointer. - -// mDNS_GetBrowseDomains is a special case of the mDNS_StartQuery call, where the resulting answers -// are a list of PTR records indicating (in the rdata) domains that are recommended for browsing. -// After getting the list of domains to browse, call mDNS_StopQuery to end the search. -// mDNS_GetDefaultBrowseDomain returns the name of the domain that should be highlighted by default. -// -// mDNS_GetRegistrationDomains and mDNS_GetDefaultRegistrationDomain are the equivalent calls to get the list -// of one or more domains that should be offered to the user as choices for where they may register their service, -// and the default domain in which to register in the case where the user has made no selection. - -extern void mDNS_SetupResourceRecord(AuthRecord *rr, RData *RDataStorage, mDNSInterfaceID InterfaceID, - mDNSu16 rrtype, mDNSu32 ttl, mDNSu8 RecordType, AuthRecType artype, mDNSRecordCallback Callback, void *Context); - -// mDNS_RegisterService() flags parameter bit definitions -enum - { - regFlagIncludeP2P = 0x1, // include P2P interfaces when using mDNSInterface_Any - regFlagKnownUnique = 0x2 // client guarantees that SRV and TXT record names are unique - }; - -extern mStatus mDNS_RegisterService (mDNS *const m, ServiceRecordSet *sr, - const domainlabel *const name, const domainname *const type, const domainname *const domain, - const domainname *const host, mDNSIPPort port, const mDNSu8 txtinfo[], mDNSu16 txtlen, - AuthRecord *SubTypes, mDNSu32 NumSubTypes, - mDNSInterfaceID InterfaceID, mDNSServiceCallback Callback, void *Context, mDNSu32 flags); -extern mStatus mDNS_AddRecordToService(mDNS *const m, ServiceRecordSet *sr, ExtraResourceRecord *extra, RData *rdata, mDNSu32 ttl, mDNSu32 includeP2P); -extern mStatus mDNS_RemoveRecordFromService(mDNS *const m, ServiceRecordSet *sr, ExtraResourceRecord *extra, mDNSRecordCallback MemFreeCallback, void *Context); -extern mStatus mDNS_RenameAndReregisterService(mDNS *const m, ServiceRecordSet *const sr, const domainlabel *newname); -extern mStatus mDNS_DeregisterService_drt(mDNS *const m, ServiceRecordSet *sr, mDNS_Dereg_type drt); -#define mDNS_DeregisterService(M,S) mDNS_DeregisterService_drt((M), (S), mDNS_Dereg_normal) - -extern mStatus mDNS_RegisterNoSuchService(mDNS *const m, AuthRecord *const rr, - const domainlabel *const name, const domainname *const type, const domainname *const domain, - const domainname *const host, - const mDNSInterfaceID InterfaceID, mDNSRecordCallback Callback, void *Context, mDNSBool includeP2P); -#define mDNS_DeregisterNoSuchService mDNS_Deregister - -extern void mDNS_SetupQuestion(DNSQuestion *const q, const mDNSInterfaceID InterfaceID, const domainname *const name, - const mDNSu16 qtype, mDNSQuestionCallback *const callback, void *const context); - -extern mStatus mDNS_StartBrowse(mDNS *const m, DNSQuestion *const question, - const domainname *const srv, const domainname *const domain, - const mDNSInterfaceID InterfaceID, mDNSBool ForceMCast, mDNSQuestionCallback *Callback, void *Context); -#define mDNS_StopBrowse mDNS_StopQuery - -extern mStatus mDNS_StartResolveService(mDNS *const m, ServiceInfoQuery *query, ServiceInfo *info, mDNSServiceInfoQueryCallback *Callback, void *Context); -extern void mDNS_StopResolveService (mDNS *const m, ServiceInfoQuery *query); - -typedef enum - { - mDNS_DomainTypeBrowse = 0, - mDNS_DomainTypeBrowseDefault = 1, - mDNS_DomainTypeBrowseAutomatic = 2, - mDNS_DomainTypeRegistration = 3, - mDNS_DomainTypeRegistrationDefault = 4, - - mDNS_DomainTypeMax = 4 - } mDNS_DomainType; - -extern const char *const mDNS_DomainTypeNames[]; - -extern mStatus mDNS_GetDomains(mDNS *const m, DNSQuestion *const question, mDNS_DomainType DomainType, const domainname *dom, - const mDNSInterfaceID InterfaceID, mDNSQuestionCallback *Callback, void *Context); -#define mDNS_StopGetDomains mDNS_StopQuery -extern mStatus mDNS_AdvertiseDomains(mDNS *const m, AuthRecord *rr, mDNS_DomainType DomainType, const mDNSInterfaceID InterfaceID, char *domname); -#define mDNS_StopAdvertiseDomains mDNS_Deregister - -extern mDNSOpaque16 mDNS_NewMessageID(mDNS *const m); -extern mDNSBool mDNS_AddressIsLocalSubnet(mDNS *const m, const mDNSInterfaceID InterfaceID, const mDNSAddr *addr); - -extern DNSServer *GetServerForName(mDNS *m, const domainname *name, mDNSInterfaceID InterfaceID); -extern DNSServer *GetServerForQuestion(mDNS *m, DNSQuestion *question); -extern mDNSu32 SetValidDNSServers(mDNS *m, DNSQuestion *question); - -// *************************************************************************** -#if 0 -#pragma mark - -#pragma mark - DNS name utility functions -#endif - -// In order to expose the full capabilities of the DNS protocol (which allows any arbitrary eight-bit values -// in domain name labels, including unlikely characters like ascii nulls and even dots) all the mDNS APIs -// work with DNS's native length-prefixed strings. For convenience in C, the following utility functions -// are provided for converting between C's null-terminated strings and DNS's length-prefixed strings. - -// Assignment -// A simple C structure assignment of a domainname can cause a protection fault by accessing unmapped memory, -// because that object is defined to be 256 bytes long, but not all domainname objects are truly the full size. -// This macro uses mDNSPlatformMemCopy() to make sure it only touches the actual bytes that are valid. -#define AssignDomainName(DST, SRC) do { mDNSu16 len__ = DomainNameLength((SRC)); \ - if (len__ <= MAX_DOMAIN_NAME) mDNSPlatformMemCopy((DST)->c, (SRC)->c, len__); else (DST)->c[0] = 0; } while(0) - -// Comparison functions -#define SameDomainLabelCS(A,B) ((A)[0] == (B)[0] && mDNSPlatformMemSame((A)+1, (B)+1, (A)[0])) -extern mDNSBool SameDomainLabel(const mDNSu8 *a, const mDNSu8 *b); -extern mDNSBool SameDomainName(const domainname *const d1, const domainname *const d2); -extern mDNSBool SameDomainNameCS(const domainname *const d1, const domainname *const d2); -typedef mDNSBool DomainNameComparisonFn(const domainname *const d1, const domainname *const d2); -extern mDNSBool IsLocalDomain(const domainname *d); // returns true for domains that by default should be looked up using link-local multicast - -#define StripFirstLabel(X) ((const domainname *)&(X)->c[(X)->c[0] ? 1 + (X)->c[0] : 0]) - -#define FirstLabel(X) ((const domainlabel *)(X)) -#define SecondLabel(X) ((const domainlabel *)StripFirstLabel(X)) -#define ThirdLabel(X) ((const domainlabel *)StripFirstLabel(StripFirstLabel(X))) - -extern const mDNSu8 *LastLabel(const domainname *d); - -// Get total length of domain name, in native DNS format, including terminal root label -// (e.g. length of "com." is 5 (length byte, three data bytes, final zero) -extern mDNSu16 DomainNameLengthLimit(const domainname *const name, const mDNSu8 *limit); -#define DomainNameLength(name) DomainNameLengthLimit((name), (name)->c + MAX_DOMAIN_NAME) - -// Append functions to append one or more labels to an existing native format domain name: -// AppendLiteralLabelString adds a single label from a literal C string, with no escape character interpretation. -// AppendDNSNameString adds zero or more labels from a C string using conventional DNS dots-and-escaping interpretation -// AppendDomainLabel adds a single label from a native format domainlabel -// AppendDomainName adds zero or more labels from a native format domainname -extern mDNSu8 *AppendLiteralLabelString(domainname *const name, const char *cstr); -extern mDNSu8 *AppendDNSNameString (domainname *const name, const char *cstr); -extern mDNSu8 *AppendDomainLabel (domainname *const name, const domainlabel *const label); -extern mDNSu8 *AppendDomainName (domainname *const name, const domainname *const append); - -// Convert from null-terminated string to native DNS format: -// The DomainLabel form makes a single label from a literal C string, with no escape character interpretation. -// The DomainName form makes native format domain name from a C string using conventional DNS interpretation: -// dots separate labels, and within each label, '\.' represents a literal dot, '\\' represents a literal -// backslash and backslash with three decimal digits (e.g. \000) represents an arbitrary byte value. -extern mDNSBool MakeDomainLabelFromLiteralString(domainlabel *const label, const char *cstr); -extern mDNSu8 *MakeDomainNameFromDNSNameString (domainname *const name, const char *cstr); - -// Convert native format domainlabel or domainname back to C string format -// IMPORTANT: -// When using ConvertDomainLabelToCString, the target buffer must be MAX_ESCAPED_DOMAIN_LABEL (254) bytes long -// to guarantee there will be no buffer overrun. It is only safe to use a buffer shorter than this in rare cases -// where the label is known to be constrained somehow (for example, if the label is known to be either "_tcp" or "_udp"). -// Similarly, when using ConvertDomainNameToCString, the target buffer must be MAX_ESCAPED_DOMAIN_NAME (1009) bytes long. -// See definitions of MAX_ESCAPED_DOMAIN_LABEL and MAX_ESCAPED_DOMAIN_NAME for more detailed explanation. -extern char *ConvertDomainLabelToCString_withescape(const domainlabel *const name, char *cstr, char esc); -#define ConvertDomainLabelToCString_unescaped(D,C) ConvertDomainLabelToCString_withescape((D), (C), 0) -#define ConvertDomainLabelToCString(D,C) ConvertDomainLabelToCString_withescape((D), (C), '\\') -extern char *ConvertDomainNameToCString_withescape(const domainname *const name, char *cstr, char esc); -#define ConvertDomainNameToCString_unescaped(D,C) ConvertDomainNameToCString_withescape((D), (C), 0) -#define ConvertDomainNameToCString(D,C) ConvertDomainNameToCString_withescape((D), (C), '\\') - -extern void ConvertUTF8PstringToRFC1034HostLabel(const mDNSu8 UTF8Name[], domainlabel *const hostlabel); - -extern mDNSu8 *ConstructServiceName(domainname *const fqdn, const domainlabel *name, const domainname *type, const domainname *const domain); -extern mDNSBool DeconstructServiceName(const domainname *const fqdn, domainlabel *const name, domainname *const type, domainname *const domain); - -// Note: Some old functions have been replaced by more sensibly-named versions. -// You can uncomment the hash-defines below if you don't want to have to change your source code right away. -// When updating your code, note that (unlike the old versions) *all* the new routines take the target object -// as their first parameter. -//#define ConvertCStringToDomainName(SRC,DST) MakeDomainNameFromDNSNameString((DST),(SRC)) -//#define ConvertCStringToDomainLabel(SRC,DST) MakeDomainLabelFromLiteralString((DST),(SRC)) -//#define AppendStringLabelToName(DST,SRC) AppendLiteralLabelString((DST),(SRC)) -//#define AppendStringNameToName(DST,SRC) AppendDNSNameString((DST),(SRC)) -//#define AppendDomainLabelToName(DST,SRC) AppendDomainLabel((DST),(SRC)) -//#define AppendDomainNameToName(DST,SRC) AppendDomainName((DST),(SRC)) - -// *************************************************************************** -#if 0 -#pragma mark - -#pragma mark - Other utility functions and macros -#endif - -// mDNS_vsnprintf/snprintf return the number of characters written, excluding the final terminating null. -// The output is always null-terminated: for example, if the output turns out to be exactly buflen long, -// then the output will be truncated by one character to allow space for the terminating null. -// Unlike standard C vsnprintf/snprintf, they return the number of characters *actually* written, -// not the number of characters that *would* have been printed were buflen unlimited. -extern mDNSu32 mDNS_vsnprintf(char *sbuffer, mDNSu32 buflen, const char *fmt, va_list arg); -extern mDNSu32 mDNS_snprintf(char *sbuffer, mDNSu32 buflen, const char *fmt, ...) IS_A_PRINTF_STYLE_FUNCTION(3,4); -extern mDNSu32 NumCacheRecordsForInterfaceID(const mDNS *const m, mDNSInterfaceID id); -extern char *DNSTypeName(mDNSu16 rrtype); -extern char *GetRRDisplayString_rdb(const ResourceRecord *const rr, const RDataBody *const rd1, char *const buffer); -#define RRDisplayString(m, rr) GetRRDisplayString_rdb(rr, &(rr)->rdata->u, (m)->MsgBuffer) -#define ARDisplayString(m, rr) GetRRDisplayString_rdb(&(rr)->resrec, &(rr)->resrec.rdata->u, (m)->MsgBuffer) -#define CRDisplayString(m, rr) GetRRDisplayString_rdb(&(rr)->resrec, &(rr)->resrec.rdata->u, (m)->MsgBuffer) -extern mDNSBool mDNSSameAddress(const mDNSAddr *ip1, const mDNSAddr *ip2); -extern void IncrementLabelSuffix(domainlabel *name, mDNSBool RichText); -extern mDNSBool mDNSv4AddrIsRFC1918(mDNSv4Addr *addr); // returns true for RFC1918 private addresses -#define mDNSAddrIsRFC1918(X) ((X)->type == mDNSAddrType_IPv4 && mDNSv4AddrIsRFC1918(&(X)->ip.v4)) - -#define mDNSSameIPPort(A,B) ((A).NotAnInteger == (B).NotAnInteger) -#define mDNSSameOpaque16(A,B) ((A).NotAnInteger == (B).NotAnInteger) -#define mDNSSameOpaque32(A,B) ((A).NotAnInteger == (B).NotAnInteger) -#define mDNSSameOpaque64(A,B) ((A)->l[0] == (B)->l[0] && (A)->l[1] == (B)->l[1]) - -#define mDNSSameIPv4Address(A,B) ((A).NotAnInteger == (B).NotAnInteger) -#define mDNSSameIPv6Address(A,B) ((A).l[0] == (B).l[0] && (A).l[1] == (B).l[1] && (A).l[2] == (B).l[2] && (A).l[3] == (B).l[3]) -#define mDNSSameEthAddress(A,B) ((A)->w[0] == (B)->w[0] && (A)->w[1] == (B)->w[1] && (A)->w[2] == (B)->w[2]) - -#define mDNSIPPortIsZero(A) ((A).NotAnInteger == 0) -#define mDNSOpaque16IsZero(A) ((A).NotAnInteger == 0) -#define mDNSOpaque64IsZero(A) (((A)->l[0] | (A)->l[1] ) == 0) -#define mDNSIPv4AddressIsZero(A) ((A).NotAnInteger == 0) -#define mDNSIPv6AddressIsZero(A) (((A).l[0] | (A).l[1] | (A).l[2] | (A).l[3]) == 0) -#define mDNSEthAddressIsZero(A) (((A).w[0] | (A).w[1] | (A).w[2] ) == 0) - -#define mDNSIPv4AddressIsOnes(A) ((A).NotAnInteger == 0xFFFFFFFF) -#define mDNSIPv6AddressIsOnes(A) (((A).l[0] & (A).l[1] & (A).l[2] & (A).l[3]) == 0xFFFFFFFF) - -#define mDNSAddressIsAllDNSLinkGroup(X) ( \ - ((X)->type == mDNSAddrType_IPv4 && mDNSSameIPv4Address((X)->ip.v4, AllDNSLinkGroup_v4.ip.v4)) || \ - ((X)->type == mDNSAddrType_IPv6 && mDNSSameIPv6Address((X)->ip.v6, AllDNSLinkGroup_v6.ip.v6)) ) - -#define mDNSAddressIsZero(X) ( \ - ((X)->type == mDNSAddrType_IPv4 && mDNSIPv4AddressIsZero((X)->ip.v4)) || \ - ((X)->type == mDNSAddrType_IPv6 && mDNSIPv6AddressIsZero((X)->ip.v6)) ) - -#define mDNSAddressIsValidNonZero(X) ( \ - ((X)->type == mDNSAddrType_IPv4 && !mDNSIPv4AddressIsZero((X)->ip.v4)) || \ - ((X)->type == mDNSAddrType_IPv6 && !mDNSIPv6AddressIsZero((X)->ip.v6)) ) - -#define mDNSAddressIsOnes(X) ( \ - ((X)->type == mDNSAddrType_IPv4 && mDNSIPv4AddressIsOnes((X)->ip.v4)) || \ - ((X)->type == mDNSAddrType_IPv6 && mDNSIPv6AddressIsOnes((X)->ip.v6)) ) - -#define mDNSAddressIsValid(X) ( \ - ((X)->type == mDNSAddrType_IPv4) ? !(mDNSIPv4AddressIsZero((X)->ip.v4) || mDNSIPv4AddressIsOnes((X)->ip.v4)) : \ - ((X)->type == mDNSAddrType_IPv6) ? !(mDNSIPv6AddressIsZero((X)->ip.v6) || mDNSIPv6AddressIsOnes((X)->ip.v6)) : mDNSfalse) - -#define mDNSv4AddressIsLinkLocal(X) ((X)->b[0] == 169 && (X)->b[1] == 254) -#define mDNSv6AddressIsLinkLocal(X) ((X)->b[0] == 0xFE && ((X)->b[1] & 0xC0) == 0x80) - -#define mDNSAddressIsLinkLocal(X) ( \ - ((X)->type == mDNSAddrType_IPv4) ? mDNSv4AddressIsLinkLocal(&(X)->ip.v4) : \ - ((X)->type == mDNSAddrType_IPv6) ? mDNSv6AddressIsLinkLocal(&(X)->ip.v6) : mDNSfalse) - -#define mDNSv4AddressIsLoopback(X) ((X)->b[0] == 127 && (X)->b[1] == 0 && (X)->b[2] == 0 && (X)->b[3] == 1) -#define mDNSv6AddressIsLoopback(X) ((((X)->l[0] | (X)->l[1] | (X)->l[2]) == 0) && ((X)->b[12] == 0 && (X)->b[13] == 0 && (X)->b[14] == 0 && (X)->b[15] == 1)) - -// *************************************************************************** -#if 0 -#pragma mark - -#pragma mark - Authentication Support -#endif - -// Unicast DNS and Dynamic Update specific Client Calls -// -// mDNS_SetSecretForDomain tells the core to authenticate (via TSIG with an HMAC_MD5 hash of the shared secret) -// when dynamically updating a given zone (and its subdomains). The key used in authentication must be in -// domain name format. The shared secret must be a null-terminated base64 encoded string. A minimum size of -// 16 bytes (128 bits) is recommended for an MD5 hash as per RFC 2485. -// Calling this routine multiple times for a zone replaces previously entered values. Call with a NULL key -// to disable authentication for the zone. A non-NULL autoTunnelPrefix means this is an AutoTunnel domain, -// and the value is prepended to the IPSec identifier (used for key lookup) - -extern mStatus mDNS_SetSecretForDomain(mDNS *m, DomainAuthInfo *info, - const domainname *domain, const domainname *keyname, const char *b64keydata, const domainname *hostname, mDNSIPPort *port, const char *autoTunnelPrefix); - -extern void RecreateNATMappings(mDNS *const m); - -// Hostname/Unicast Interface Configuration - -// All hostnames advertised point to one IPv4 address and/or one IPv6 address, set via SetPrimaryInterfaceInfo. Invoking this routine -// updates all existing hostnames to point to the new address. - -// A hostname is added via AddDynDNSHostName, which points to the primary interface's v4 and/or v6 addresss - -// The status callback is invoked to convey success or failure codes - the callback should not modify the AuthRecord or free memory. -// Added hostnames may be removed (deregistered) via mDNS_RemoveDynDNSHostName. - -// Host domains added prior to specification of the primary interface address and computer name will be deferred until -// these values are initialized. - -// DNS servers used to resolve unicast queries are specified by mDNS_AddDNSServer. -// For "split" DNS configurations, in which queries for different domains are sent to different servers (e.g. VPN and external), -// a domain may be associated with a DNS server. For standard configurations, specify the root label (".") or NULL. - -extern void mDNS_AddDynDNSHostName(mDNS *m, const domainname *fqdn, mDNSRecordCallback *StatusCallback, const void *StatusContext); -extern void mDNS_RemoveDynDNSHostName(mDNS *m, const domainname *fqdn); -extern void mDNS_SetPrimaryInterfaceInfo(mDNS *m, const mDNSAddr *v4addr, const mDNSAddr *v6addr, const mDNSAddr *router); -extern DNSServer *mDNS_AddDNSServer(mDNS *const m, const domainname *d, const mDNSInterfaceID interface, const mDNSAddr *addr, const mDNSIPPort port, mDNSBool scoped, mDNSu32 timeout, mDNSBool cellIntf); -extern void PenalizeDNSServer(mDNS *const m, DNSQuestion *q); -extern void mDNS_AddSearchDomain(const domainname *const domain, mDNSInterfaceID InterfaceID); - -extern McastResolver *mDNS_AddMcastResolver(mDNS *const m, const domainname *d, const mDNSInterfaceID interface, mDNSu32 timeout); - -// We use ((void *)0) here instead of mDNSNULL to avoid compile warnings on gcc 4.2 -#define mDNS_AddSearchDomain_CString(X, I) \ - do { domainname d__; if (((X) != (void*)0) && MakeDomainNameFromDNSNameString(&d__, (X)) && d__.c[0]) mDNS_AddSearchDomain(&d__, I); } while(0) - -// Routines called by the core, exported by DNSDigest.c - -// Convert an arbitrary base64 encoded key key into an HMAC key (stored in AuthInfo struct) -extern mDNSs32 DNSDigest_ConstructHMACKeyfromBase64(DomainAuthInfo *info, const char *b64key); - -// sign a DNS message. The message must be complete, with all values in network byte order. end points to the end -// of the message, and is modified by this routine. numAdditionals is a pointer to the number of additional -// records in HOST byte order, which is incremented upon successful completion of this routine. The function returns -// the new end pointer on success, and NULL on failure. -extern void DNSDigest_SignMessage(DNSMessage *msg, mDNSu8 **end, DomainAuthInfo *info, mDNSu16 tcode); - -#define SwapDNSHeaderBytes(M) do { \ - (M)->h.numQuestions = (mDNSu16)((mDNSu8 *)&(M)->h.numQuestions )[0] << 8 | ((mDNSu8 *)&(M)->h.numQuestions )[1]; \ - (M)->h.numAnswers = (mDNSu16)((mDNSu8 *)&(M)->h.numAnswers )[0] << 8 | ((mDNSu8 *)&(M)->h.numAnswers )[1]; \ - (M)->h.numAuthorities = (mDNSu16)((mDNSu8 *)&(M)->h.numAuthorities)[0] << 8 | ((mDNSu8 *)&(M)->h.numAuthorities)[1]; \ - (M)->h.numAdditionals = (mDNSu16)((mDNSu8 *)&(M)->h.numAdditionals)[0] << 8 | ((mDNSu8 *)&(M)->h.numAdditionals)[1]; \ - } while (0) - -#define DNSDigest_SignMessageHostByteOrder(M,E,INFO) \ - do { SwapDNSHeaderBytes(M); DNSDigest_SignMessage((M), (E), (INFO), 0); SwapDNSHeaderBytes(M); } while (0) - -// verify a DNS message. The message must be complete, with all values in network byte order. end points to the -// end of the record. tsig is a pointer to the resource record that contains the TSIG OPT record. info is -// the matching key to use for verifying the message. This function expects that the additionals member -// of the DNS message header has already had one subtracted from it. -extern mDNSBool DNSDigest_VerifyMessage(DNSMessage *msg, mDNSu8 *end, LargeCacheRecord *tsig, DomainAuthInfo *info, mDNSu16 *rcode, mDNSu16 *tcode); - -// *************************************************************************** -#if 0 -#pragma mark - -#pragma mark - PlatformSupport interface -#endif - -// This section defines the interface to the Platform Support layer. -// Normal client code should not use any of types defined here, or directly call any of the functions defined here. -// The definitions are placed here because sometimes clients do use these calls indirectly, via other supported client operations. -// For example, AssignDomainName is a macro defined using mDNSPlatformMemCopy() - -// Every platform support module must provide the following functions. -// mDNSPlatformInit() typically opens a communication endpoint, and starts listening for mDNS packets. -// When Setup is complete, the platform support layer calls mDNSCoreInitComplete(). -// mDNSPlatformSendUDP() sends one UDP packet -// When a packet is received, the PlatformSupport code calls mDNSCoreReceive() -// mDNSPlatformClose() tidies up on exit -// -// Note: mDNSPlatformMemAllocate/mDNSPlatformMemFree are only required for handling oversized resource records and unicast DNS. -// If your target platform has a well-defined specialized application, and you know that all the records it uses -// are InlineCacheRDSize or less, then you can just make a simple mDNSPlatformMemAllocate() stub that always returns -// NULL. InlineCacheRDSize is a compile-time constant, which is set by default to 68. If you need to handle records -// a little larger than this and you don't want to have to implement run-time allocation and freeing, then you -// can raise the value of this constant to a suitable value (at the expense of increased memory usage). -// -// USE CAUTION WHEN CALLING mDNSPlatformRawTime: The m->timenow_adjust correction factor needs to be added -// Generally speaking: -// Code that's protected by the main mDNS lock should just use the m->timenow value -// Code outside the main mDNS lock should use mDNS_TimeNow(m) to get properly adjusted time -// In certain cases there may be reasons why it's necessary to get the time without taking the lock first -// (e.g. inside the routines that are doing the locking and unlocking, where a call to get the lock would result in a -// recursive loop); in these cases use mDNS_TimeNow_NoLock(m) to get mDNSPlatformRawTime with the proper correction factor added. -// -// mDNSPlatformUTC returns the time, in seconds, since Jan 1st 1970 UTC and is required for generating TSIG records - -extern mStatus mDNSPlatformInit (mDNS *const m); -extern void mDNSPlatformClose (mDNS *const m); -extern mStatus mDNSPlatformSendUDP(const mDNS *const m, const void *const msg, const mDNSu8 *const end, -mDNSInterfaceID InterfaceID, UDPSocket *src, const mDNSAddr *dst, mDNSIPPort dstport); - -extern void mDNSPlatformLock (const mDNS *const m); -extern void mDNSPlatformUnlock (const mDNS *const m); - -extern void mDNSPlatformStrCopy ( void *dst, const void *src); -extern mDNSu32 mDNSPlatformStrLen ( const void *src); -extern void mDNSPlatformMemCopy ( void *dst, const void *src, mDNSu32 len); -extern mDNSBool mDNSPlatformMemSame (const void *dst, const void *src, mDNSu32 len); -extern void mDNSPlatformMemZero ( void *dst, mDNSu32 len); -#if APPLE_OSX_mDNSResponder && MACOSX_MDNS_MALLOC_DEBUGGING -#define mDNSPlatformMemAllocate(X) mallocL(#X, X) -#else -extern void * mDNSPlatformMemAllocate (mDNSu32 len); -#endif -extern void mDNSPlatformMemFree (void *mem); - -// If the platform doesn't have a strong PRNG, we define a naive multiply-and-add based on a seed -// from the platform layer. Long-term, we should embed an arc4 implementation, but the strength -// will still depend on the randomness of the seed. -#if !defined(_PLATFORM_HAS_STRONG_PRNG_) && (_BUILDING_XCODE_PROJECT_ || defined(_WIN32)) -#define _PLATFORM_HAS_STRONG_PRNG_ 1 -#endif -#if _PLATFORM_HAS_STRONG_PRNG_ -extern mDNSu32 mDNSPlatformRandomNumber(void); -#else -extern mDNSu32 mDNSPlatformRandomSeed (void); -#endif // _PLATFORM_HAS_STRONG_PRNG_ - -extern mStatus mDNSPlatformTimeInit (void); -extern mDNSs32 mDNSPlatformRawTime (void); -extern mDNSs32 mDNSPlatformUTC (void); -#define mDNS_TimeNow_NoLock(m) (mDNSPlatformRawTime() + (m)->timenow_adjust) - -#if MDNS_DEBUGMSGS -extern void mDNSPlatformWriteDebugMsg(const char *msg); -#endif -extern void mDNSPlatformWriteLogMsg(const char *ident, const char *msg, mDNSLogLevel_t loglevel); - -#if APPLE_OSX_mDNSResponder -// Utility function for ASL logging -mDNSexport void mDNSASLLog(uuid_t *uuid, const char *subdomain, const char *result, const char *signature, const char *fmt, ...); -#endif - -// Platform support modules should provide the following functions to map between opaque interface IDs -// and interface indexes in order to support the DNS-SD API. If your target platform does not support -// multiple interfaces and/or does not support the DNS-SD API, these functions can be empty. -extern mDNSInterfaceID mDNSPlatformInterfaceIDfromInterfaceIndex(mDNS *const m, mDNSu32 ifindex); -extern mDNSu32 mDNSPlatformInterfaceIndexfromInterfaceID(mDNS *const m, mDNSInterfaceID id, mDNSBool suppressNetworkChange); - -// Every platform support module must provide the following functions if it is to support unicast DNS -// and Dynamic Update. -// All TCP socket operations implemented by the platform layer MUST NOT BLOCK. -// mDNSPlatformTCPConnect initiates a TCP connection with a peer, adding the socket descriptor to the -// main event loop. The return value indicates whether the connection succeeded, failed, or is pending -// (i.e. the call would block.) On return, the descriptor parameter is set to point to the connected socket. -// The TCPConnectionCallback is subsequently invoked when the connection -// completes (in which case the ConnectionEstablished parameter is true), or data is available for -// reading on the socket (indicated by the ConnectionEstablished parameter being false.) If the connection -// asynchronously fails, the TCPConnectionCallback should be invoked as usual, with the error being -// returned in subsequent calls to PlatformReadTCP or PlatformWriteTCP. (This allows for platforms -// with limited asynchronous error detection capabilities.) PlatformReadTCP and PlatformWriteTCP must -// return the number of bytes read/written, 0 if the call would block, and -1 if an error. PlatformReadTCP -// should set the closed argument if the socket has been closed. -// PlatformTCPCloseConnection must close the connection to the peer and remove the descriptor from the -// event loop. CloseConnectin may be called at any time, including in a ConnectionCallback. - -typedef enum - { - kTCPSocketFlags_Zero = 0, - kTCPSocketFlags_UseTLS = (1 << 0) - } TCPSocketFlags; - -typedef void (*TCPConnectionCallback)(TCPSocket *sock, void *context, mDNSBool ConnectionEstablished, mStatus err); -extern TCPSocket *mDNSPlatformTCPSocket(mDNS *const m, TCPSocketFlags flags, mDNSIPPort *port); // creates a TCP socket -extern TCPSocket *mDNSPlatformTCPAccept(TCPSocketFlags flags, int sd); -extern int mDNSPlatformTCPGetFD(TCPSocket *sock); -extern mStatus mDNSPlatformTCPConnect(TCPSocket *sock, const mDNSAddr *dst, mDNSOpaque16 dstport, domainname *hostname, - mDNSInterfaceID InterfaceID, TCPConnectionCallback callback, void *context); -extern void mDNSPlatformTCPCloseConnection(TCPSocket *sock); -extern long mDNSPlatformReadTCP(TCPSocket *sock, void *buf, unsigned long buflen, mDNSBool *closed); -extern long mDNSPlatformWriteTCP(TCPSocket *sock, const char *msg, unsigned long len); -extern UDPSocket *mDNSPlatformUDPSocket(mDNS *const m, const mDNSIPPort requestedport); -extern void mDNSPlatformUDPClose(UDPSocket *sock); -extern void mDNSPlatformReceiveBPF_fd(mDNS *const m, int fd); -extern void mDNSPlatformUpdateProxyList(mDNS *const m, const mDNSInterfaceID InterfaceID); -extern void mDNSPlatformSendRawPacket(const void *const msg, const mDNSu8 *const end, mDNSInterfaceID InterfaceID); -extern void mDNSPlatformSetLocalAddressCacheEntry(mDNS *const m, const mDNSAddr *const tpa, const mDNSEthAddr *const tha, mDNSInterfaceID InterfaceID); -extern void mDNSPlatformSourceAddrForDest(mDNSAddr *const src, const mDNSAddr *const dst); - -// mDNSPlatformTLSSetupCerts/mDNSPlatformTLSTearDownCerts used by dnsextd -extern mStatus mDNSPlatformTLSSetupCerts(void); -extern void mDNSPlatformTLSTearDownCerts(void); - -// Platforms that support unicast browsing and dynamic update registration for clients who do not specify a domain -// in browse/registration calls must implement these routines to get the "default" browse/registration list. - -extern void mDNSPlatformSetDNSConfig(mDNS *const m, mDNSBool setservers, mDNSBool setsearch, domainname *const fqdn, DNameListElem **RegDomains, DNameListElem **BrowseDomains); -extern mStatus mDNSPlatformGetPrimaryInterface(mDNS *const m, mDNSAddr *v4, mDNSAddr *v6, mDNSAddr *router); -extern void mDNSPlatformDynDNSHostNameStatusChanged(const domainname *const dname, const mStatus status); - -extern void mDNSPlatformSetAllowSleep(mDNS *const m, mDNSBool allowSleep, const char *reason); -extern void mDNSPlatformSendWakeupPacket(mDNS *const m, mDNSInterfaceID InterfaceID, char *EthAddr, char *IPAddr, int iteration); -extern mDNSBool mDNSPlatformValidRecordForInterface(AuthRecord *rr, const NetworkInterfaceInfo *intf); - -#ifdef _LEGACY_NAT_TRAVERSAL_ -// Support for legacy NAT traversal protocols, implemented by the platform layer and callable by the core. -extern void LNT_SendDiscoveryMsg(mDNS *m); -extern void LNT_ConfigureRouterInfo(mDNS *m, const mDNSInterfaceID InterfaceID, const mDNSu8 *const data, const mDNSu16 len); -extern mStatus LNT_GetExternalAddress(mDNS *m); -extern mStatus LNT_MapPort(mDNS *m, NATTraversalInfo *const n); -extern mStatus LNT_UnmapPort(mDNS *m, NATTraversalInfo *const n); -extern void LNT_ClearState(mDNS *const m); -#endif // _LEGACY_NAT_TRAVERSAL_ - -// The core mDNS code provides these functions, for the platform support code to call at appropriate times -// -// mDNS_SetFQDN() is called once on startup (typically from mDNSPlatformInit()) -// and then again on each subsequent change of the host name. -// -// mDNS_RegisterInterface() is used by the platform support layer to inform mDNSCore of what -// physical and/or logical interfaces are available for sending and receiving packets. -// Typically it is called on startup for each available interface, but register/deregister may be -// called again later, on multiple occasions, to inform the core of interface configuration changes. -// If set->Advertise is set non-zero, then mDNS_RegisterInterface() also registers the standard -// resource records that should be associated with every publicised IP address/interface: -// -- Name-to-address records (A/AAAA) -// -- Address-to-name records (PTR) -// -- Host information (HINFO) -// IMPORTANT: The specified mDNSInterfaceID MUST NOT be 0, -1, or -2; these values have special meaning -// mDNS_RegisterInterface does not result in the registration of global hostnames via dynamic update - -// see mDNS_SetPrimaryInterfaceInfo, mDNS_AddDynDNSHostName, etc. for this purpose. -// Note that the set may be deallocated immediately after it is deregistered via mDNS_DeegisterInterface. -// -// mDNS_RegisterDNS() is used by the platform support layer to provide the core with the addresses of -// available domain name servers for unicast queries/updates. RegisterDNS() should be called once for -// each name server, typically at startup, or when a new name server becomes available. DeregiterDNS() -// must be called whenever a registered name server becomes unavailable. DeregisterDNSList deregisters -// all registered servers. mDNS_DNSRegistered() returns true if one or more servers are registered in the core. -// -// mDNSCoreInitComplete() is called when the platform support layer is finished. -// Typically this is at the end of mDNSPlatformInit(), but may be later -// (on platforms like OT that allow asynchronous initialization of the networking stack). -// -// mDNSCoreReceive() is called when a UDP packet is received -// -// mDNSCoreMachineSleep() is called when the machine sleeps or wakes -// (This refers to heavyweight laptop-style sleep/wake that disables network access, -// not lightweight second-by-second CPU power management modes.) - -extern void mDNS_SetFQDN(mDNS *const m); -extern void mDNS_ActivateNetWake_internal (mDNS *const m, NetworkInterfaceInfo *set); -extern void mDNS_DeactivateNetWake_internal(mDNS *const m, NetworkInterfaceInfo *set); -extern mStatus mDNS_RegisterInterface (mDNS *const m, NetworkInterfaceInfo *set, mDNSBool flapping); -extern void mDNS_DeregisterInterface(mDNS *const m, NetworkInterfaceInfo *set, mDNSBool flapping); -extern void mDNSCoreInitComplete(mDNS *const m, mStatus result); -extern void mDNSCoreReceive(mDNS *const m, void *const msg, const mDNSu8 *const end, - const mDNSAddr *const srcaddr, const mDNSIPPort srcport, - const mDNSAddr *dstaddr, const mDNSIPPort dstport, const mDNSInterfaceID InterfaceID); -extern void mDNSCoreRestartQueries(mDNS *const m); -typedef void (*FlushCache)(mDNS *const m); -typedef void (*CallbackBeforeStartQuery)(mDNS *const m, void *context); -extern void mDNSCoreRestartAddressQueries(mDNS *const m, mDNSBool SearchDomainsChanged, FlushCache flushCacheRecords, - CallbackBeforeStartQuery beforeQueryStart, void *context); -extern mDNSBool mDNSCoreHaveAdvertisedMulticastServices(mDNS *const m); -extern void mDNSCoreMachineSleep(mDNS *const m, mDNSBool wake); -extern mDNSBool mDNSCoreReadyForSleep(mDNS *m, mDNSs32 now); -extern mDNSs32 mDNSCoreIntervalToNextWake(mDNS *const m, mDNSs32 now); - -extern void mDNSCoreReceiveRawPacket (mDNS *const m, const mDNSu8 *const p, const mDNSu8 *const end, const mDNSInterfaceID InterfaceID); - -extern mDNSBool mDNSAddrIsDNSMulticast(const mDNSAddr *ip); - -extern CacheRecord *CreateNewCacheEntry(mDNS *const m, const mDNSu32 slot, CacheGroup *cg, mDNSs32 delay); -extern void ScheduleNextCacheCheckTime(mDNS *const m, const mDNSu32 slot, const mDNSs32 event); -extern void GrantCacheExtensions(mDNS *const m, DNSQuestion *q, mDNSu32 lease); -extern void MakeNegativeCacheRecord(mDNS *const m, CacheRecord *const cr, - const domainname *const name, const mDNSu32 namehash, const mDNSu16 rrtype, const mDNSu16 rrclass, mDNSu32 ttl_seconds, - mDNSInterfaceID InterfaceID, DNSServer *dnsserver); -extern void CompleteDeregistration(mDNS *const m, AuthRecord *rr); -extern void AnswerCurrentQuestionWithResourceRecord(mDNS *const m, CacheRecord *const rr, const QC_result AddRecord); -extern char *InterfaceNameForID(mDNS *const m, const mDNSInterfaceID InterfaceID); -extern void DNSServerChangeForQuestion(mDNS *const m, DNSQuestion *q, DNSServer *newServer); -extern void ActivateUnicastRegistration(mDNS *const m, AuthRecord *const rr); -extern void CheckSuppressUnusableQuestions(mDNS *const m); -extern void RetrySearchDomainQuestions(mDNS *const m); -extern mDNSBool DomainEnumQuery(const domainname *qname); - -// Used only in logging to restrict the number of /etc/hosts entries printed -extern void FreeEtcHosts(mDNS *const m, AuthRecord *const rr, mStatus result); -// exported for using the hash for /etc/hosts AuthRecords -extern AuthGroup *AuthGroupForName(AuthHash *r, const mDNSu32 slot, const mDNSu32 namehash, const domainname *const name); -extern AuthGroup *AuthGroupForRecord(AuthHash *r, const mDNSu32 slot, const ResourceRecord *const rr); -extern AuthGroup *InsertAuthRecord(mDNS *const m, AuthHash *r, AuthRecord *rr); -extern AuthGroup *RemoveAuthRecord(mDNS *const m, AuthHash *r, AuthRecord *rr); - -// For now this AutoTunnel stuff is specific to Mac OS X. -// In the future, if there's demand, we may see if we can abstract it out cleanly into the platform layer -#if APPLE_OSX_mDNSResponder -extern void AutoTunnelCallback(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, QC_result AddRecord); -extern void AddNewClientTunnel(mDNS *const m, DNSQuestion *const q); -extern void SetupLocalAutoTunnelInterface_internal(mDNS *const m, mDNSBool servicesStarting); -extern void UpdateAutoTunnelDomainStatuses(const mDNS *const m); -extern mStatus ActivateLocalProxy(mDNS *const m, char *ifname); -extern void RemoveAutoTunnel6Record(mDNS *const m); -extern mDNSBool RecordReadyForSleep(mDNS *const m, AuthRecord *rr); -#endif - -// *************************************************************************** -#if 0 -#pragma mark - -#pragma mark - Sleep Proxy -#endif - -// Sleep Proxy Server Property Encoding -// -// Sleep Proxy Servers are advertised using a structured service name, consisting of four -// metrics followed by a human-readable name. The metrics assist clients in deciding which -// Sleep Proxy Server(s) to use when multiple are available on the network. Each metric -// is a two-digit decimal number in the range 10-99. Lower metrics are generally better. -// -// AA-BB-CC-DD Name -// -// Metrics: -// -// AA = Intent -// BB = Portability -// CC = Marginal Power -// DD = Total Power -// -// -// ** Intent Metric ** -// -// 20 = Dedicated Sleep Proxy Server -- a device, permanently powered on, -// installed for the express purpose of providing Sleep Proxy Service. -// -// 30 = Primary Network Infrastructure Hardware -- a router, DHCP server, NAT gateway, -// or similar permanently installed device which is permanently powered on. -// This is hardware designed for the express purpose of being network -// infrastructure, and for most home users is typically a single point -// of failure for the local network -- e.g. most home users only have -// a single NAT gateway / DHCP server. Even though in principle the -// hardware might technically be capable of running different software, -// a typical user is unlikely to do that. e.g. AirPort base station. -// -// 40 = Primary Network Infrastructure Software -- a general-purpose computer -// (e.g. Mac, Windows, Linux, etc.) which is currently running DHCP server -// or NAT gateway software, but the user could choose to turn that off -// fairly easily. e.g. iMac running Internet Sharing -// -// 50 = Secondary Network Infrastructure Hardware -- like primary infrastructure -// hardware, except not a single point of failure for the entire local network. -// For example, an AirPort base station in bridge mode. This may have clients -// associated with it, and if it goes away those clients will be inconvenienced, -// but unlike the NAT gateway / DHCP server, the entire local network is not -// dependent on it. -// -// 60 = Secondary Network Infrastructure Software -- like 50, but in a general- -// purpose CPU. -// -// 70 = Incidentally Available Hardware -- a device which has no power switch -// and is generally left powered on all the time. Even though it is not a -// part of what we conventionally consider network infrastructure (router, -// DHCP, NAT, DNS, etc.), and the rest of the network can operate fine -// without it, since it's available and unlikely to be turned off, it is a -// reasonable candidate for providing Sleep Proxy Service e.g. Apple TV, -// or an AirPort base station in client mode, associated with an existing -// wireless network (e.g. AirPort Express connected to a music system, or -// being used to share a USB printer). -// -// 80 = Incidentally Available Software -- a general-purpose computer which -// happens at this time to be set to "never sleep", and as such could be -// useful as a Sleep Proxy Server, but has not been intentionally provided -// for this purpose. Of all the Intent Metric categories this is the -// one most likely to be shut down or put to sleep without warning. -// However, if nothing else is availalable, it may be better than nothing. -// e.g. Office computer in the workplace which has been set to "never sleep" -// -// -// ** Portability Metric ** -// -// Inversely related to mass of device, on the basis that, all other things -// being equal, heavier devices are less likely to be moved than lighter devices. -// E.g. A MacBook running Internet Sharing is probably more likely to be -// put to sleep and taken away than a Mac Pro running Internet Sharing. -// The Portability Metric is a logarithmic decibel scale, computed by taking the -// (approximate) mass of the device in milligrammes, taking the base 10 logarithm -// of that, multiplying by 10, and subtracting the result from 100: -// -// Portability Metric = 100 - (log10(mg) * 10) -// -// The Portability Metric is not necessarily computed literally from the actual -// mass of the device; the intent is just that lower numbers indicate more -// permanent devices, and higher numbers indicate devices more likely to be -// removed from the network, e.g., in order of increasing portability: -// -// Mac Pro < iMac < Laptop < iPhone -// -// Example values: -// -// 10 = 1 metric tonne -// 40 = 1kg -// 70 = 1g -// 90 = 10mg -// -// -// ** Marginal Power and Total Power Metrics ** -// -// The Marginal Power Metric is the power difference between sleeping and staying awake -// to be a Sleep Proxy Server. -// -// The Total Power Metric is the total power consumption when being Sleep Proxy Server. -// -// The Power Metrics use a logarithmic decibel scale, computed as ten times the -// base 10 logarithm of the (approximate) power in microwatts: -// -// Power Metric = log10(uW) * 10 -// -// Higher values indicate higher power consumption. Example values: -// -// 10 = 10 uW -// 20 = 100 uW -// 30 = 1 mW -// 60 = 1 W -// 90 = 1 kW - -typedef enum - { - mDNSSleepProxyMetric_Dedicated = 20, - mDNSSleepProxyMetric_PrimaryHardware = 30, - mDNSSleepProxyMetric_PrimarySoftware = 40, - mDNSSleepProxyMetric_SecondaryHardware = 50, - mDNSSleepProxyMetric_SecondarySoftware = 60, - mDNSSleepProxyMetric_IncidentalHardware = 70, - mDNSSleepProxyMetric_IncidentalSoftware = 80 - } mDNSSleepProxyMetric; - -extern void mDNSCoreBeSleepProxyServer_internal(mDNS *const m, mDNSu8 sps, mDNSu8 port, mDNSu8 marginalpower, mDNSu8 totpower); -#define mDNSCoreBeSleepProxyServer(M,S,P,MP,TP) \ - do { mDNS_Lock(m); mDNSCoreBeSleepProxyServer_internal((M),(S),(P),(MP),(TP)); mDNS_Unlock(m); } while(0) - -extern void FindSPSInCache(mDNS *const m, const DNSQuestion *const q, const CacheRecord *sps[3]); -#define PrototypeSPSName(X) ((X)[0] >= 11 && (X)[3] == '-' && (X)[ 4] == '9' && (X)[ 5] == '9' && \ - (X)[6] == '-' && (X)[ 7] == '9' && (X)[ 8] == '9' && \ - (X)[9] == '-' && (X)[10] == '9' && (X)[11] == '9' ) -#define ValidSPSName(X) ((X)[0] >= 5 && mDNSIsDigit((X)[1]) && mDNSIsDigit((X)[2]) && mDNSIsDigit((X)[4]) && mDNSIsDigit((X)[5])) -#define SPSMetric(X) (!ValidSPSName(X) || PrototypeSPSName(X) ? 1000000 : \ - ((X)[1]-'0') * 100000 + ((X)[2]-'0') * 10000 + ((X)[4]-'0') * 1000 + ((X)[5]-'0') * 100 + ((X)[7]-'0') * 10 + ((X)[8]-'0')) - -// *************************************************************************** -#if 0 -#pragma mark - -#pragma mark - Compile-Time assertion checks -#endif - -// Some C compiler cleverness. We can make the compiler check certain things for -// us, and report compile-time errors if anything is wrong. The usual way to do -// this would be to use a run-time "if" statement, but then you don't find out -// what's wrong until you run the software. This way, if the assertion condition -// is false, the array size is negative, and the complier complains immediately. - -struct CompileTimeAssertionChecks_mDNS - { - // Check that the compiler generated our on-the-wire packet format structure definitions - // properly packed, without adding padding bytes to align fields on 32-bit or 64-bit boundaries. - char assert0[(sizeof(rdataSRV) == 262 ) ? 1 : -1]; - char assert1[(sizeof(DNSMessageHeader) == 12 ) ? 1 : -1]; - char assert2[(sizeof(DNSMessage) == 12+AbsoluteMaxDNSMessageData) ? 1 : -1]; - char assert3[(sizeof(mDNSs8) == 1 ) ? 1 : -1]; - char assert4[(sizeof(mDNSu8) == 1 ) ? 1 : -1]; - char assert5[(sizeof(mDNSs16) == 2 ) ? 1 : -1]; - char assert6[(sizeof(mDNSu16) == 2 ) ? 1 : -1]; - char assert7[(sizeof(mDNSs32) == 4 ) ? 1 : -1]; - char assert8[(sizeof(mDNSu32) == 4 ) ? 1 : -1]; - char assert9[(sizeof(mDNSOpaque16) == 2 ) ? 1 : -1]; - char assertA[(sizeof(mDNSOpaque32) == 4 ) ? 1 : -1]; - char assertB[(sizeof(mDNSOpaque128) == 16 ) ? 1 : -1]; - char assertC[(sizeof(CacheRecord ) == sizeof(CacheGroup) ) ? 1 : -1]; - char assertD[(sizeof(int) >= 4 ) ? 1 : -1]; - char assertE[(StandardAuthRDSize >= 256 ) ? 1 : -1]; - char assertF[(sizeof(EthernetHeader) == 14 ) ? 1 : -1]; - char assertG[(sizeof(ARP_EthIP ) == 28 ) ? 1 : -1]; - char assertH[(sizeof(IPv4Header ) == 20 ) ? 1 : -1]; - char assertI[(sizeof(IPv6Header ) == 40 ) ? 1 : -1]; - char assertJ[(sizeof(IPv6NDP ) == 24 ) ? 1 : -1]; - char assertK[(sizeof(UDPHeader ) == 8 ) ? 1 : -1]; - char assertL[(sizeof(IKEHeader ) == 28 ) ? 1 : -1]; - char assertM[(sizeof(TCPHeader ) == 20 ) ? 1 : -1]; - - // Check our structures are reasonable sizes. Including overly-large buffers, or embedding - // other overly-large structures instead of having a pointer to them, can inadvertently - // cause structure sizes (and therefore memory usage) to balloon unreasonably. - char sizecheck_RDataBody [(sizeof(RDataBody) == 264) ? 1 : -1]; - char sizecheck_ResourceRecord [(sizeof(ResourceRecord) <= 64) ? 1 : -1]; - char sizecheck_AuthRecord [(sizeof(AuthRecord) <= 1208) ? 1 : -1]; - char sizecheck_CacheRecord [(sizeof(CacheRecord) <= 184) ? 1 : -1]; - char sizecheck_CacheGroup [(sizeof(CacheGroup) <= 184) ? 1 : -1]; - char sizecheck_DNSQuestion [(sizeof(DNSQuestion) <= 786) ? 1 : -1]; - char sizecheck_ZoneData [(sizeof(ZoneData) <= 1624) ? 1 : -1]; - char sizecheck_NATTraversalInfo [(sizeof(NATTraversalInfo) <= 192) ? 1 : -1]; - char sizecheck_HostnameInfo [(sizeof(HostnameInfo) <= 3050) ? 1 : -1]; - char sizecheck_DNSServer [(sizeof(DNSServer) <= 328) ? 1 : -1]; - char sizecheck_NetworkInterfaceInfo[(sizeof(NetworkInterfaceInfo) <= 6850) ? 1 : -1]; - char sizecheck_ServiceRecordSet [(sizeof(ServiceRecordSet) <= 5500) ? 1 : -1]; - char sizecheck_DomainAuthInfo [(sizeof(DomainAuthInfo) <= 7808) ? 1 : -1]; - char sizecheck_ServiceInfoQuery [(sizeof(ServiceInfoQuery) <= 3200) ? 1 : -1]; -#if APPLE_OSX_mDNSResponder - char sizecheck_ClientTunnel [(sizeof(ClientTunnel) <= 1148) ? 1 : -1]; -#endif - }; - -// *************************************************************************** - -#ifdef __cplusplus - } -#endif - -#endif diff --git a/src/tools/mdnssd/mDNSPosix.c b/src/tools/mdnssd/mDNSPosix.c deleted file mode 100755 index a1868709db..0000000000 --- a/src/tools/mdnssd/mDNSPosix.c +++ /dev/null @@ -1,1621 +0,0 @@ -/* -*- Mode: C; tab-width: 4 -*- - * - * Copyright (c) 2002-2004 Apple Computer, Inc. All rights reserved. - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - * - * Formatting notes: - * This code follows the "Whitesmiths style" C indentation rules. Plenty of discussion - * on C indentation can be found on the web, such as , - * but for the sake of brevity here I will say just this: Curly braces are not syntactially - * part of an "if" statement; they are the beginning and ending markers of a compound statement; - * therefore common sense dictates that if they are part of a compound statement then they - * should be indented to the same level as everything else in that compound statement. - * Indenting curly braces at the same level as the "if" implies that curly braces are - * part of the "if", which is false. (This is as misleading as people who write "char* x,y;" - * thinking that variables x and y are both of type "char*" -- and anyone who doesn't - * understand why variable y is not of type "char*" just proves the point that poor code - * layout leads people to unfortunate misunderstandings about how the C language really works.) - */ - -#include "mDNSEmbeddedAPI.h" // Defines the interface provided to the client layer above -#include "DNSCommon.h" -#include "mDNSPosix.h" // Defines the specific types needed to run mDNS on this platform -#include "dns_sd.h" - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include // platform support for UTC time - -#if USES_NETLINK -#include -#include -#include -#else // USES_NETLINK -#include -#include -#endif // USES_NETLINK - -#include "mDNSUNP.h" -#include "GenLinkedList.h" - -// *************************************************************************** -// Structures - -// We keep a list of client-supplied event sources in PosixEventSource records -struct PosixEventSource - { - mDNSPosixEventCallback Callback; - void *Context; - int fd; - struct PosixEventSource *Next; - }; -typedef struct PosixEventSource PosixEventSource; - -// Context record for interface change callback -struct IfChangeRec - { - int NotifySD; - mDNS *mDNS; - }; -typedef struct IfChangeRec IfChangeRec; - -// Note that static data is initialized to zero in (modern) C. -static fd_set gEventFDs; -static int gMaxFD; // largest fd in gEventFDs -static GenLinkedList gEventSources; // linked list of PosixEventSource's -static sigset_t gEventSignalSet; // Signals which event loop listens for -static sigset_t gEventSignals; // Signals which were received while inside loop - -// *************************************************************************** -// Globals (for debugging) - -static int num_registered_interfaces = 0; -static int num_pkts_accepted = 0; -static int num_pkts_rejected = 0; - -// *************************************************************************** -// Functions - -int gMDNSPlatformPosixVerboseLevel = 0; - -#define PosixErrorToStatus(errNum) ((errNum) == 0 ? mStatus_NoError : mStatus_UnknownErr) - -mDNSlocal void SockAddrTomDNSAddr(const struct sockaddr *const sa, mDNSAddr *ipAddr, mDNSIPPort *ipPort) - { - switch (sa->sa_family) - { - case AF_INET: - { - struct sockaddr_in *sin = (struct sockaddr_in*)sa; - ipAddr->type = mDNSAddrType_IPv4; - ipAddr->ip.v4.NotAnInteger = sin->sin_addr.s_addr; - if (ipPort) ipPort->NotAnInteger = sin->sin_port; - break; - } - -#if HAVE_IPV6 - case AF_INET6: - { - struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)sa; -#ifndef NOT_HAVE_SA_LEN - assert(sin6->sin6_len == sizeof(*sin6)); -#endif - ipAddr->type = mDNSAddrType_IPv6; - ipAddr->ip.v6 = *(mDNSv6Addr*)&sin6->sin6_addr; - if (ipPort) ipPort->NotAnInteger = sin6->sin6_port; - break; - } -#endif - - default: - verbosedebugf("SockAddrTomDNSAddr: Uknown address family %d\n", sa->sa_family); - ipAddr->type = mDNSAddrType_None; - if (ipPort) ipPort->NotAnInteger = 0; - break; - } - } - -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark ***** Send and Receive -#endif - -// mDNS core calls this routine when it needs to send a packet. -mDNSexport mStatus mDNSPlatformSendUDP(const mDNS *const m, const void *const msg, const mDNSu8 *const end, - mDNSInterfaceID InterfaceID, UDPSocket *src, const mDNSAddr *dst, mDNSIPPort dstPort) - { - int err = 0; - struct sockaddr_storage to; - PosixNetworkInterface * thisIntf = (PosixNetworkInterface *)(InterfaceID); - int sendingsocket = -1; - - (void)src; // Will need to use this parameter once we implement mDNSPlatformUDPSocket/mDNSPlatformUDPClose - - assert(m != NULL); - assert(msg != NULL); - assert(end != NULL); - assert((((char *) end) - ((char *) msg)) > 0); - - if (dstPort.NotAnInteger == 0) - { - LogMsg("mDNSPlatformSendUDP: Invalid argument -dstPort is set to 0"); - return PosixErrorToStatus(EINVAL); - } - if (dst->type == mDNSAddrType_IPv4) - { - struct sockaddr_in *sin = (struct sockaddr_in*)&to; -#ifndef NOT_HAVE_SA_LEN - sin->sin_len = sizeof(*sin); -#endif - sin->sin_family = AF_INET; - sin->sin_port = dstPort.NotAnInteger; - sin->sin_addr.s_addr = dst->ip.v4.NotAnInteger; - sendingsocket = thisIntf ? thisIntf->multicastSocket4 : m->p->unicastSocket4; - } - -#if HAVE_IPV6 - else if (dst->type == mDNSAddrType_IPv6) - { - struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)&to; - mDNSPlatformMemZero(sin6, sizeof(*sin6)); -#ifndef NOT_HAVE_SA_LEN - sin6->sin6_len = sizeof(*sin6); -#endif - sin6->sin6_family = AF_INET6; - sin6->sin6_port = dstPort.NotAnInteger; - sin6->sin6_addr = *(struct in6_addr*)&dst->ip.v6; - sendingsocket = thisIntf ? thisIntf->multicastSocket6 : m->p->unicastSocket6; - } -#endif - - if (sendingsocket >= 0) - err = sendto(sendingsocket, msg, (char*)end - (char*)msg, 0, (struct sockaddr *)&to, GET_SA_LEN(to)); - - if (err > 0) err = 0; - else if (err < 0) - { - static int MessageCount = 0; - // Don't report EHOSTDOWN (i.e. ARP failure), ENETDOWN, or no route to host for unicast destinations - if (!mDNSAddressIsAllDNSLinkGroup(dst)) - if (errno == EHOSTDOWN || errno == ENETDOWN || errno == EHOSTUNREACH || errno == ENETUNREACH) return(mStatus_TransientErr); - - if (MessageCount < 1000) - { - MessageCount++; - if (thisIntf) - LogMsg("mDNSPlatformSendUDP got error %d (%s) sending packet to %#a on interface %#a/%s/%d", - errno, strerror(errno), dst, &thisIntf->coreIntf.ip, thisIntf->intfName, thisIntf->index); - else - LogMsg("mDNSPlatformSendUDP got error %d (%s) sending packet to %#a", errno, strerror(errno), dst); - } - } - - return PosixErrorToStatus(err); - } - -// This routine is called when the main loop detects that data is available on a socket. -mDNSlocal void SocketDataReady(mDNS *const m, PosixNetworkInterface *intf, int skt) - { - mDNSAddr senderAddr, destAddr; - mDNSIPPort senderPort; - ssize_t packetLen; - DNSMessage packet; - struct my_in_pktinfo packetInfo; - struct sockaddr_storage from; - socklen_t fromLen; - int flags; - mDNSu8 ttl; - mDNSBool reject; - const mDNSInterfaceID InterfaceID = intf ? intf->coreIntf.InterfaceID : NULL; - - assert(m != NULL); - assert(skt >= 0); - - fromLen = sizeof(from); - flags = 0; - packetLen = recvfrom_flags(skt, &packet, sizeof(packet), &flags, (struct sockaddr *) &from, &fromLen, &packetInfo, &ttl); - - if (packetLen >= 0) - { - SockAddrTomDNSAddr((struct sockaddr*)&from, &senderAddr, &senderPort); - SockAddrTomDNSAddr((struct sockaddr*)&packetInfo.ipi_addr, &destAddr, NULL); - - // If we have broken IP_RECVDSTADDR functionality (so far - // I've only seen this on OpenBSD) then apply a hack to - // convince mDNS Core that this isn't a spoof packet. - // Basically what we do is check to see whether the - // packet arrived as a multicast and, if so, set its - // destAddr to the mDNS address. - // - // I must admit that I could just be doing something - // wrong on OpenBSD and hence triggering this problem - // but I'm at a loss as to how. - // - // If this platform doesn't have IP_PKTINFO or IP_RECVDSTADDR, then we have - // no way to tell the destination address or interface this packet arrived on, - // so all we can do is just assume it's a multicast - - #if HAVE_BROKEN_RECVDSTADDR || (!defined(IP_PKTINFO) && !defined(IP_RECVDSTADDR)) - if ((destAddr.NotAnInteger == 0) && (flags & MSG_MCAST)) - { - destAddr.type = senderAddr.type; - if (senderAddr.type == mDNSAddrType_IPv4) destAddr.ip.v4 = AllDNSLinkGroup_v4.ip.v4; - else if (senderAddr.type == mDNSAddrType_IPv6) destAddr.ip.v6 = AllDNSLinkGroup_v6.ip.v6; - } - #endif - - // We only accept the packet if the interface on which it came - // in matches the interface associated with this socket. - // We do this match by name or by index, depending on which - // information is available. recvfrom_flags sets the name - // to "" if the name isn't available, or the index to -1 - // if the index is available. This accomodates the various - // different capabilities of our target platforms. - - reject = mDNSfalse; - if (!intf) - { - // Ignore multicasts accidentally delivered to our unicast receiving socket - if (mDNSAddrIsDNSMulticast(&destAddr)) packetLen = -1; - } - else - { - if (packetInfo.ipi_ifname[0] != 0) reject = (strcmp(packetInfo.ipi_ifname, intf->intfName) != 0); - else if (packetInfo.ipi_ifindex != -1) reject = (packetInfo.ipi_ifindex != intf->index); - - if (reject) - { - verbosedebugf("SocketDataReady ignored a packet from %#a to %#a on interface %s/%d expecting %#a/%s/%d/%d", - &senderAddr, &destAddr, packetInfo.ipi_ifname, packetInfo.ipi_ifindex, - &intf->coreIntf.ip, intf->intfName, intf->index, skt); - packetLen = -1; - num_pkts_rejected++; - if (num_pkts_rejected > (num_pkts_accepted + 1) * (num_registered_interfaces + 1) * 2) - { - fprintf(stderr, - "*** WARNING: Received %d packets; Accepted %d packets; Rejected %d packets because of interface mismatch\n", - num_pkts_accepted + num_pkts_rejected, num_pkts_accepted, num_pkts_rejected); - num_pkts_accepted = 0; - num_pkts_rejected = 0; - } - } - else - { - verbosedebugf("SocketDataReady got a packet from %#a to %#a on interface %#a/%s/%d/%d", - &senderAddr, &destAddr, &intf->coreIntf.ip, intf->intfName, intf->index, skt); - num_pkts_accepted++; - } - } - } - - if (packetLen >= 0) - mDNSCoreReceive(m, &packet, (mDNSu8 *)&packet + packetLen, - &senderAddr, senderPort, &destAddr, MulticastDNSPort, InterfaceID); - } - -mDNSexport TCPSocket *mDNSPlatformTCPSocket(mDNS * const m, TCPSocketFlags flags, mDNSIPPort * port) - { - (void)m; // Unused - (void)flags; // Unused - (void)port; // Unused - return NULL; - } - -mDNSexport TCPSocket *mDNSPlatformTCPAccept(TCPSocketFlags flags, int sd) - { - (void)flags; // Unused - (void)sd; // Unused - return NULL; - } - -mDNSexport int mDNSPlatformTCPGetFD(TCPSocket *sock) - { - (void)sock; // Unused - return -1; - } - -mDNSexport mStatus mDNSPlatformTCPConnect(TCPSocket *sock, const mDNSAddr *dst, mDNSOpaque16 dstport, domainname *hostname, mDNSInterfaceID InterfaceID, - TCPConnectionCallback callback, void *context) - { - (void)sock; // Unused - (void)dst; // Unused - (void)dstport; // Unused - (void)hostname; // Unused - (void)InterfaceID; // Unused - (void)callback; // Unused - (void)context; // Unused - return(mStatus_UnsupportedErr); - } - -mDNSexport void mDNSPlatformTCPCloseConnection(TCPSocket *sock) - { - (void)sock; // Unused - } - -mDNSexport long mDNSPlatformReadTCP(TCPSocket *sock, void *buf, unsigned long buflen, mDNSBool * closed) - { - (void)sock; // Unused - (void)buf; // Unused - (void)buflen; // Unused - (void)closed; // Unused - return 0; - } - -mDNSexport long mDNSPlatformWriteTCP(TCPSocket *sock, const char *msg, unsigned long len) - { - (void)sock; // Unused - (void)msg; // Unused - (void)len; // Unused - return 0; - } - -mDNSexport UDPSocket *mDNSPlatformUDPSocket(mDNS * const m, mDNSIPPort port) - { - (void)m; // Unused - (void)port; // Unused - return NULL; - } - -mDNSexport void mDNSPlatformUDPClose(UDPSocket *sock) - { - (void)sock; // Unused - } - -mDNSexport void mDNSPlatformUpdateProxyList(mDNS *const m, const mDNSInterfaceID InterfaceID) - { - (void)m; // Unused - (void)InterfaceID; // Unused - } - -mDNSexport void mDNSPlatformSendRawPacket(const void *const msg, const mDNSu8 *const end, mDNSInterfaceID InterfaceID) - { - (void)msg; // Unused - (void)end; // Unused - (void)InterfaceID; // Unused - } - -mDNSexport void mDNSPlatformSetLocalAddressCacheEntry(mDNS *const m, const mDNSAddr *const tpa, const mDNSEthAddr *const tha, mDNSInterfaceID InterfaceID) - { - (void)m; // Unused - (void)tpa; // Unused - (void)tha; // Unused - (void)InterfaceID; // Unused - } - -mDNSexport mStatus mDNSPlatformTLSSetupCerts(void) - { - return(mStatus_UnsupportedErr); - } - -mDNSexport void mDNSPlatformTLSTearDownCerts(void) - { - } - -mDNSexport void mDNSPlatformSetAllowSleep(mDNS *const m, mDNSBool allowSleep, const char *reason) - { - (void) m; - (void) allowSleep; - (void) reason; - } - -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - /etc/hosts support -#endif - -mDNSexport void FreeEtcHosts(mDNS *const m, AuthRecord *const rr, mStatus result) - { - (void)m; // unused - (void)rr; - (void)result; - } - - -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark ***** DDNS Config Platform Functions -#endif - -mDNSexport void mDNSPlatformSetDNSConfig(mDNS *const m, mDNSBool setservers, mDNSBool setsearch, domainname *const fqdn, DNameListElem **RegDomains, DNameListElem **BrowseDomains) - { - (void) m; - (void) setservers; - (void) fqdn; - (void) setsearch; - (void) RegDomains; - (void) BrowseDomains; - } - -mDNSexport mStatus mDNSPlatformGetPrimaryInterface(mDNS * const m, mDNSAddr * v4, mDNSAddr * v6, mDNSAddr * router) - { - (void) m; - (void) v4; - (void) v6; - (void) router; - - return mStatus_UnsupportedErr; - } - -mDNSexport void mDNSPlatformDynDNSHostNameStatusChanged(const domainname *const dname, const mStatus status) - { - (void) dname; - (void) status; - } - -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark ***** Init and Term -#endif - -// This gets the current hostname, truncating it at the first dot if necessary -mDNSlocal void GetUserSpecifiedRFC1034ComputerName(domainlabel *const namelabel) - { - int len = 0; - gethostname((char *)(&namelabel->c[1]), MAX_DOMAIN_LABEL); - while (len < MAX_DOMAIN_LABEL && namelabel->c[len+1] && namelabel->c[len+1] != '.') len++; - namelabel->c[0] = len; - } - -// On OS X this gets the text of the field labelled "Computer Name" in the Sharing Prefs Control Panel -// Other platforms can either get the information from the appropriate place, -// or they can alternatively just require all registering services to provide an explicit name -mDNSlocal void GetUserSpecifiedFriendlyComputerName(domainlabel *const namelabel) - { - // On Unix we have no better name than the host name, so we just use that. - GetUserSpecifiedRFC1034ComputerName(namelabel); - } - -mDNSexport int ParseDNSServers(mDNS *m, const char *filePath) - { - char line[256]; - char nameserver[16]; - char keyword[10]; - int numOfServers = 0; - FILE *fp = fopen(filePath, "r"); - if (fp == NULL) return -1; - while (fgets(line,sizeof(line),fp)) - { - struct in_addr ina; - line[255]='\0'; // just to be safe - if (sscanf(line,"%10s %15s", keyword, nameserver) != 2) continue; // it will skip whitespaces - if (strncasecmp(keyword,"nameserver",10)) continue; - if (inet_aton(nameserver, (struct in_addr *)&ina) != 0) - { - mDNSAddr DNSAddr; - DNSAddr.type = mDNSAddrType_IPv4; - DNSAddr.ip.v4.NotAnInteger = ina.s_addr; - mDNS_AddDNSServer(m, NULL, mDNSInterface_Any, &DNSAddr, UnicastDNSPort, mDNSfalse, 0, mDNSfalse); - numOfServers++; - } - } - return (numOfServers > 0) ? 0 : -1; - } - -// Searches the interface list looking for the named interface. -// Returns a pointer to if it found, or NULL otherwise. -mDNSlocal PosixNetworkInterface *SearchForInterfaceByName(mDNS *const m, const char *intfName) - { - PosixNetworkInterface *intf; - - assert(m != NULL); - assert(intfName != NULL); - - intf = (PosixNetworkInterface*)(m->HostInterfaces); - while ((intf != NULL) && (strcmp(intf->intfName, intfName) != 0)) - intf = (PosixNetworkInterface *)(intf->coreIntf.next); - - return intf; - } - -mDNSexport mDNSInterfaceID mDNSPlatformInterfaceIDfromInterfaceIndex(mDNS *const m, mDNSu32 index) - { - PosixNetworkInterface *intf; - - assert(m != NULL); - - if (index == kDNSServiceInterfaceIndexLocalOnly) return(mDNSInterface_LocalOnly); - if (index == kDNSServiceInterfaceIndexP2P ) return(mDNSInterface_P2P); - if (index == kDNSServiceInterfaceIndexAny ) return(mDNSInterface_Any); - - intf = (PosixNetworkInterface*)(m->HostInterfaces); - while ((intf != NULL) && (mDNSu32) intf->index != index) - intf = (PosixNetworkInterface *)(intf->coreIntf.next); - - return (mDNSInterfaceID) intf; - } - -mDNSexport mDNSu32 mDNSPlatformInterfaceIndexfromInterfaceID(mDNS *const m, mDNSInterfaceID id, mDNSBool suppressNetworkChange) - { - PosixNetworkInterface *intf; - (void) suppressNetworkChange; // Unused - - assert(m != NULL); - - if (id == mDNSInterface_LocalOnly) return(kDNSServiceInterfaceIndexLocalOnly); - if (id == mDNSInterface_P2P ) return(kDNSServiceInterfaceIndexP2P); - if (id == mDNSInterface_Any ) return(kDNSServiceInterfaceIndexAny); - - intf = (PosixNetworkInterface*)(m->HostInterfaces); - while ((intf != NULL) && (mDNSInterfaceID) intf != id) - intf = (PosixNetworkInterface *)(intf->coreIntf.next); - - return intf ? intf->index : 0; - } - -// Frees the specified PosixNetworkInterface structure. The underlying -// interface must have already been deregistered with the mDNS core. -mDNSlocal void FreePosixNetworkInterface(PosixNetworkInterface *intf) - { - assert(intf != NULL); - if (intf->intfName != NULL) free((void *)intf->intfName); - if (intf->multicastSocket4 != -1) assert(close(intf->multicastSocket4) == 0); -#if HAVE_IPV6 - if (intf->multicastSocket6 != -1) assert(close(intf->multicastSocket6) == 0); -#endif - free(intf); - } - -// Grab the first interface, deregister it, free it, and repeat until done. -mDNSlocal void ClearInterfaceList(mDNS *const m) - { - assert(m != NULL); - - while (m->HostInterfaces) - { - PosixNetworkInterface *intf = (PosixNetworkInterface*)(m->HostInterfaces); - mDNS_DeregisterInterface(m, &intf->coreIntf, mDNSfalse); - if (gMDNSPlatformPosixVerboseLevel > 0) fprintf(stderr, "Deregistered interface %s\n", intf->intfName); - FreePosixNetworkInterface(intf); - } - num_registered_interfaces = 0; - num_pkts_accepted = 0; - num_pkts_rejected = 0; - } - -// Sets up a send/receive socket. -// If mDNSIPPort port is non-zero, then it's a multicast socket on the specified interface -// If mDNSIPPort port is zero, then it's a randomly assigned port number, used for sending unicast queries -mDNSlocal int SetupSocket(struct sockaddr *intfAddr, mDNSIPPort port, int interfaceIndex, int *sktPtr) - { - int err = 0; - static const int kOn = 1; - static const int kIntTwoFiveFive = 255; - static const unsigned char kByteTwoFiveFive = 255; - const mDNSBool JoinMulticastGroup = (port.NotAnInteger != 0); - - (void) interfaceIndex; // This parameter unused on plaforms that don't have IPv6 - assert(intfAddr != NULL); - assert(sktPtr != NULL); - assert(*sktPtr == -1); - - // Open the socket... - if (intfAddr->sa_family == AF_INET) *sktPtr = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP); -#if HAVE_IPV6 - else if (intfAddr->sa_family == AF_INET6) *sktPtr = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP); -#endif - else return EINVAL; - - if (*sktPtr < 0) { err = errno; perror((intfAddr->sa_family == AF_INET) ? "socket AF_INET" : "socket AF_INET6"); } - - // ... with a shared UDP port, if it's for multicast receiving - if (err == 0 && port.NotAnInteger) - { - #if defined(SO_REUSEPORT) - err = setsockopt(*sktPtr, SOL_SOCKET, SO_REUSEPORT, &kOn, sizeof(kOn)); - #elif defined(SO_REUSEADDR) - err = setsockopt(*sktPtr, SOL_SOCKET, SO_REUSEADDR, &kOn, sizeof(kOn)); - #else - #error This platform has no way to avoid address busy errors on multicast. - #endif - if (err < 0) { err = errno; perror("setsockopt - SO_REUSExxxx"); } - } - - // We want to receive destination addresses and interface identifiers. - if (intfAddr->sa_family == AF_INET) - { - struct ip_mreq imr; - struct sockaddr_in bindAddr; - if (err == 0) - { - #if defined(IP_PKTINFO) // Linux - err = setsockopt(*sktPtr, IPPROTO_IP, IP_PKTINFO, &kOn, sizeof(kOn)); - if (err < 0) { err = errno; perror("setsockopt - IP_PKTINFO"); } - #elif defined(IP_RECVDSTADDR) || defined(IP_RECVIF) // BSD and Solaris - #if defined(IP_RECVDSTADDR) - err = setsockopt(*sktPtr, IPPROTO_IP, IP_RECVDSTADDR, &kOn, sizeof(kOn)); - if (err < 0) { err = errno; perror("setsockopt - IP_RECVDSTADDR"); } - #endif - #if defined(IP_RECVIF) - if (err == 0) - { - err = setsockopt(*sktPtr, IPPROTO_IP, IP_RECVIF, &kOn, sizeof(kOn)); - if (err < 0) { err = errno; perror("setsockopt - IP_RECVIF"); } - } - #endif - #else - #warning This platform has no way to get the destination interface information -- will only work for single-homed hosts - #endif - } - #if defined(IP_RECVTTL) // Linux - if (err == 0) - { - setsockopt(*sktPtr, IPPROTO_IP, IP_RECVTTL, &kOn, sizeof(kOn)); - // We no longer depend on being able to get the received TTL, so don't worry if the option fails - } - #endif - - // Add multicast group membership on this interface - if (err == 0 && JoinMulticastGroup) - { - imr.imr_multiaddr.s_addr = AllDNSLinkGroup_v4.ip.v4.NotAnInteger; - imr.imr_interface = ((struct sockaddr_in*)intfAddr)->sin_addr; - err = setsockopt(*sktPtr, IPPROTO_IP, IP_ADD_MEMBERSHIP, &imr, sizeof(imr)); - if (err < 0) { err = errno; perror("setsockopt - IP_ADD_MEMBERSHIP"); } - } - - // Specify outgoing interface too - if (err == 0 && JoinMulticastGroup) - { - err = setsockopt(*sktPtr, IPPROTO_IP, IP_MULTICAST_IF, &((struct sockaddr_in*)intfAddr)->sin_addr, sizeof(struct in_addr)); - if (err < 0) { err = errno; perror("setsockopt - IP_MULTICAST_IF"); } - } - - // Per the mDNS spec, send unicast packets with TTL 255 - if (err == 0) - { - err = setsockopt(*sktPtr, IPPROTO_IP, IP_TTL, &kIntTwoFiveFive, sizeof(kIntTwoFiveFive)); - if (err < 0) { err = errno; perror("setsockopt - IP_TTL"); } - } - - // and multicast packets with TTL 255 too - // There's some debate as to whether IP_MULTICAST_TTL is an int or a byte so we just try both. - if (err == 0) - { - err = setsockopt(*sktPtr, IPPROTO_IP, IP_MULTICAST_TTL, &kByteTwoFiveFive, sizeof(kByteTwoFiveFive)); - if (err < 0 && errno == EINVAL) - err = setsockopt(*sktPtr, IPPROTO_IP, IP_MULTICAST_TTL, &kIntTwoFiveFive, sizeof(kIntTwoFiveFive)); - if (err < 0) { err = errno; perror("setsockopt - IP_MULTICAST_TTL"); } - } - - // And start listening for packets - if (err == 0) - { - bindAddr.sin_family = AF_INET; - bindAddr.sin_port = port.NotAnInteger; - bindAddr.sin_addr.s_addr = INADDR_ANY; // Want to receive multicasts AND unicasts on this socket - err = bind(*sktPtr, (struct sockaddr *) &bindAddr, sizeof(bindAddr)); - if (err < 0) { err = errno; perror("bind"); fflush(stderr); } - } - } // endif (intfAddr->sa_family == AF_INET) - -#if HAVE_IPV6 - else if (intfAddr->sa_family == AF_INET6) - { - struct ipv6_mreq imr6; - struct sockaddr_in6 bindAddr6; -#if defined(IPV6_PKTINFO) - if (err == 0) - { - err = setsockopt(*sktPtr, IPPROTO_IPV6, IPV6_2292_PKTINFO, &kOn, sizeof(kOn)); - if (err < 0) { err = errno; perror("setsockopt - IPV6_PKTINFO"); } - } - #else - #warning This platform has no way to get the destination interface information for IPv6 -- will only work for single-homed hosts - #endif - #if defined(IPV6_HOPLIMIT) - if (err == 0) - { - err = setsockopt(*sktPtr, IPPROTO_IPV6, IPV6_2292_HOPLIMIT, &kOn, sizeof(kOn)); - if (err < 0) { err = errno; perror("setsockopt - IPV6_HOPLIMIT"); } - } - #endif - - // Add multicast group membership on this interface - if (err == 0 && JoinMulticastGroup) - { - imr6.ipv6mr_multiaddr = *(const struct in6_addr*)&AllDNSLinkGroup_v6.ip.v6; - imr6.ipv6mr_interface = interfaceIndex; - //LogMsg("Joining %.16a on %d", &imr6.ipv6mr_multiaddr, imr6.ipv6mr_interface); - err = setsockopt(*sktPtr, IPPROTO_IPV6, IPV6_JOIN_GROUP, &imr6, sizeof(imr6)); - if (err < 0) - { - err = errno; - verbosedebugf("IPV6_JOIN_GROUP %.16a on %d failed.\n", &imr6.ipv6mr_multiaddr, imr6.ipv6mr_interface); - perror("setsockopt - IPV6_JOIN_GROUP"); - } - } - - // Specify outgoing interface too - if (err == 0 && JoinMulticastGroup) - { - u_int multicast_if = interfaceIndex; - err = setsockopt(*sktPtr, IPPROTO_IPV6, IPV6_MULTICAST_IF, &multicast_if, sizeof(multicast_if)); - if (err < 0) { err = errno; perror("setsockopt - IPV6_MULTICAST_IF"); } - } - - // We want to receive only IPv6 packets on this socket. - // Without this option, we may get IPv4 addresses as mapped addresses. - if (err == 0) - { - err = setsockopt(*sktPtr, IPPROTO_IPV6, IPV6_V6ONLY, &kOn, sizeof(kOn)); - if (err < 0) { err = errno; perror("setsockopt - IPV6_V6ONLY"); } - } - - // Per the mDNS spec, send unicast packets with TTL 255 - if (err == 0) - { - err = setsockopt(*sktPtr, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &kIntTwoFiveFive, sizeof(kIntTwoFiveFive)); - if (err < 0) { err = errno; perror("setsockopt - IPV6_UNICAST_HOPS"); } - } - - // and multicast packets with TTL 255 too - // There's some debate as to whether IPV6_MULTICAST_HOPS is an int or a byte so we just try both. - if (err == 0) - { - err = setsockopt(*sktPtr, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &kByteTwoFiveFive, sizeof(kByteTwoFiveFive)); - if (err < 0 && errno == EINVAL) - err = setsockopt(*sktPtr, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &kIntTwoFiveFive, sizeof(kIntTwoFiveFive)); - if (err < 0) { err = errno; perror("setsockopt - IPV6_MULTICAST_HOPS"); } - } - - // And start listening for packets - if (err == 0) - { - mDNSPlatformMemZero(&bindAddr6, sizeof(bindAddr6)); -#ifndef NOT_HAVE_SA_LEN - bindAddr6.sin6_len = sizeof(bindAddr6); -#endif - bindAddr6.sin6_family = AF_INET6; - bindAddr6.sin6_port = port.NotAnInteger; - bindAddr6.sin6_flowinfo = 0; - bindAddr6.sin6_addr = in6addr_any; // Want to receive multicasts AND unicasts on this socket - bindAddr6.sin6_scope_id = 0; - err = bind(*sktPtr, (struct sockaddr *) &bindAddr6, sizeof(bindAddr6)); - if (err < 0) { err = errno; perror("bind"); fflush(stderr); } - } - } // endif (intfAddr->sa_family == AF_INET6) -#endif - - // Set the socket to non-blocking. - if (err == 0) - { - err = fcntl(*sktPtr, F_GETFL, 0); - if (err < 0) err = errno; - else - { - err = fcntl(*sktPtr, F_SETFL, err | O_NONBLOCK); - if (err < 0) err = errno; - } - } - - // Clean up - if (err != 0 && *sktPtr != -1) { assert(close(*sktPtr) == 0); *sktPtr = -1; } - assert((err == 0) == (*sktPtr != -1)); - return err; - } - -// Creates a PosixNetworkInterface for the interface whose IP address is -// intfAddr and whose name is intfName and registers it with mDNS core. -mDNSlocal int SetupOneInterface(mDNS *const m, struct sockaddr *intfAddr, struct sockaddr *intfMask, const char *intfName, int intfIndex) - { - int err = 0; - PosixNetworkInterface *intf; - PosixNetworkInterface *alias = NULL; - - assert(m != NULL); - assert(intfAddr != NULL); - assert(intfName != NULL); - assert(intfMask != NULL); - - // Allocate the interface structure itself. - intf = (PosixNetworkInterface*)malloc(sizeof(*intf)); - if (intf == NULL) { assert(0); err = ENOMEM; } - - // And make a copy of the intfName. - if (err == 0) - { - intf->intfName = strdup(intfName); - if (intf->intfName == NULL) { assert(0); err = ENOMEM; } - } - - if (err == 0) - { - // Set up the fields required by the mDNS core. - SockAddrTomDNSAddr(intfAddr, &intf->coreIntf.ip, NULL); - SockAddrTomDNSAddr(intfMask, &intf->coreIntf.mask, NULL); - - //LogMsg("SetupOneInterface: %#a %#a", &intf->coreIntf.ip, &intf->coreIntf.mask); - strncpy(intf->coreIntf.ifname, intfName, sizeof(intf->coreIntf.ifname)); - intf->coreIntf.ifname[sizeof(intf->coreIntf.ifname)-1] = 0; - intf->coreIntf.Advertise = m->AdvertiseLocalAddresses; - intf->coreIntf.McastTxRx = mDNStrue; - - // Set up the extra fields in PosixNetworkInterface. - assert(intf->intfName != NULL); // intf->intfName already set up above - intf->index = intfIndex; - intf->multicastSocket4 = -1; -#if HAVE_IPV6 - intf->multicastSocket6 = -1; -#endif - alias = SearchForInterfaceByName(m, intf->intfName); - if (alias == NULL) alias = intf; - intf->coreIntf.InterfaceID = (mDNSInterfaceID)alias; - - if (alias != intf) - debugf("SetupOneInterface: %s %#a is an alias of %#a", intfName, &intf->coreIntf.ip, &alias->coreIntf.ip); - } - - // Set up the multicast socket - if (err == 0) - { - if (alias->multicastSocket4 == -1 && intfAddr->sa_family == AF_INET) - err = SetupSocket(intfAddr, MulticastDNSPort, intf->index, &alias->multicastSocket4); -#if HAVE_IPV6 - else if (alias->multicastSocket6 == -1 && intfAddr->sa_family == AF_INET6) - err = SetupSocket(intfAddr, MulticastDNSPort, intf->index, &alias->multicastSocket6); -#endif - } - - // The interface is all ready to go, let's register it with the mDNS core. - if (err == 0) - err = mDNS_RegisterInterface(m, &intf->coreIntf, mDNSfalse); - - // Clean up. - if (err == 0) - { - num_registered_interfaces++; - debugf("SetupOneInterface: %s %#a Registered", intf->intfName, &intf->coreIntf.ip); - if (gMDNSPlatformPosixVerboseLevel > 0) - fprintf(stderr, "Registered interface %s\n", intf->intfName); - } - else - { - // Use intfName instead of intf->intfName in the next line to avoid dereferencing NULL. - debugf("SetupOneInterface: %s %#a failed to register %d", intfName, &intf->coreIntf.ip, err); - if (intf) { FreePosixNetworkInterface(intf); intf = NULL; } - } - - assert((err == 0) == (intf != NULL)); - - return err; - } - -// Call get_ifi_info() to obtain a list of active interfaces and call SetupOneInterface() on each one. -mDNSlocal int SetupInterfaceList(mDNS *const m) - { - mDNSBool foundav4 = mDNSfalse; - int err = 0; - struct ifi_info *intfList = get_ifi_info(AF_INET, mDNStrue); - struct ifi_info *firstLoopback = NULL; - - assert(m != NULL); - debugf("SetupInterfaceList"); - - if (intfList == NULL) err = ENOENT; - -#if HAVE_IPV6 - if (err == 0) /* Link the IPv6 list to the end of the IPv4 list */ - { - struct ifi_info **p = &intfList; - while (*p) p = &(*p)->ifi_next; - *p = get_ifi_info(AF_INET6, mDNStrue); - } -#endif - - if (err == 0) - { - struct ifi_info *i = intfList; - while (i) - { - if ( ((i->ifi_addr->sa_family == AF_INET) -#if HAVE_IPV6 - || (i->ifi_addr->sa_family == AF_INET6) -#endif - ) && (i->ifi_flags & IFF_UP) && !(i->ifi_flags & IFF_POINTOPOINT)) - { - if (i->ifi_flags & IFF_LOOPBACK) - { - if (firstLoopback == NULL) - firstLoopback = i; - } - else - { - if (SetupOneInterface(m, i->ifi_addr, i->ifi_netmask, i->ifi_name, i->ifi_index) == 0) - if (i->ifi_addr->sa_family == AF_INET) - foundav4 = mDNStrue; - } - } - i = i->ifi_next; - } - - // If we found no normal interfaces but we did find a loopback interface, register the - // loopback interface. This allows self-discovery if no interfaces are configured. - // Temporary workaround: Multicast loopback on IPv6 interfaces appears not to work. - // In the interim, we skip loopback interface only if we found at least one v4 interface to use - // if ((m->HostInterfaces == NULL) && (firstLoopback != NULL)) - if (!foundav4 && firstLoopback) - (void) SetupOneInterface(m, firstLoopback->ifi_addr, firstLoopback->ifi_netmask, firstLoopback->ifi_name, firstLoopback->ifi_index); - } - - // Clean up. - if (intfList != NULL) free_ifi_info(intfList); - return err; - } - -#if USES_NETLINK - -// See for a description of NetLink - -// Open a socket that will receive interface change notifications -mDNSlocal mStatus OpenIfNotifySocket(int *pFD) - { - mStatus err = mStatus_NoError; - struct sockaddr_nl snl; - int sock; - int ret; - - sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE); - if (sock < 0) - return errno; - - // Configure read to be non-blocking because inbound msg size is not known in advance - (void) fcntl(sock, F_SETFL, O_NONBLOCK); - - /* Subscribe the socket to Link & IP addr notifications. */ - mDNSPlatformMemZero(&snl, sizeof snl); - snl.nl_family = AF_NETLINK; - snl.nl_groups = RTMGRP_LINK | RTMGRP_IPV4_IFADDR; - ret = bind(sock, (struct sockaddr *) &snl, sizeof snl); - if (0 == ret) - *pFD = sock; - else - err = errno; - - return err; - } - -#if MDNS_DEBUGMSGS -mDNSlocal void PrintNetLinkMsg(const struct nlmsghdr *pNLMsg) - { - const char *kNLMsgTypes[] = { "", "NLMSG_NOOP", "NLMSG_ERROR", "NLMSG_DONE", "NLMSG_OVERRUN" }; - const char *kNLRtMsgTypes[] = { "RTM_NEWLINK", "RTM_DELLINK", "RTM_GETLINK", "RTM_NEWADDR", "RTM_DELADDR", "RTM_GETADDR" }; - - printf("nlmsghdr len=%d, type=%s, flags=0x%x\n", pNLMsg->nlmsg_len, - pNLMsg->nlmsg_type < RTM_BASE ? kNLMsgTypes[pNLMsg->nlmsg_type] : kNLRtMsgTypes[pNLMsg->nlmsg_type - RTM_BASE], - pNLMsg->nlmsg_flags); - - if (RTM_NEWLINK <= pNLMsg->nlmsg_type && pNLMsg->nlmsg_type <= RTM_GETLINK) - { - struct ifinfomsg *pIfInfo = (struct ifinfomsg*) NLMSG_DATA(pNLMsg); - printf("ifinfomsg family=%d, type=%d, index=%d, flags=0x%x, change=0x%x\n", pIfInfo->ifi_family, - pIfInfo->ifi_type, pIfInfo->ifi_index, pIfInfo->ifi_flags, pIfInfo->ifi_change); - - } - else if (RTM_NEWADDR <= pNLMsg->nlmsg_type && pNLMsg->nlmsg_type <= RTM_GETADDR) - { - struct ifaddrmsg *pIfAddr = (struct ifaddrmsg*) NLMSG_DATA(pNLMsg); - printf("ifaddrmsg family=%d, index=%d, flags=0x%x\n", pIfAddr->ifa_family, - pIfAddr->ifa_index, pIfAddr->ifa_flags); - } - printf("\n"); - } -#endif - -mDNSlocal mDNSu32 ProcessRoutingNotification(int sd) -// Read through the messages on sd and if any indicate that any interface records should -// be torn down and rebuilt, return affected indices as a bitmask. Otherwise return 0. - { - ssize_t readCount; - char buff[4096]; - struct nlmsghdr *pNLMsg = (struct nlmsghdr*) buff; - mDNSu32 result = 0; - - // The structure here is more complex than it really ought to be because, - // unfortunately, there's no good way to size a buffer in advance large - // enough to hold all pending data and so avoid message fragmentation. - // (Note that FIONREAD is not supported on AF_NETLINK.) - - readCount = read(sd, buff, sizeof buff); - while (1) - { - // Make sure we've got an entire nlmsghdr in the buffer, and payload, too. - // If not, discard already-processed messages in buffer and read more data. - if (((char*) &pNLMsg[1] > (buff + readCount)) || // i.e. *pNLMsg extends off end of buffer - ((char*) pNLMsg + pNLMsg->nlmsg_len > (buff + readCount))) - { - if (buff < (char*) pNLMsg) // we have space to shuffle - { - // discard processed data - readCount -= ((char*) pNLMsg - buff); - memmove(buff, pNLMsg, readCount); - pNLMsg = (struct nlmsghdr*) buff; - - // read more data - readCount += read(sd, buff + readCount, sizeof buff - readCount); - continue; // spin around and revalidate with new readCount - } - else - break; // Otherwise message does not fit in buffer - } - -#if MDNS_DEBUGMSGS - PrintNetLinkMsg(pNLMsg); -#endif - - // Process the NetLink message - if (pNLMsg->nlmsg_type == RTM_GETLINK || pNLMsg->nlmsg_type == RTM_NEWLINK) - result |= 1 << ((struct ifinfomsg*) NLMSG_DATA(pNLMsg))->ifi_index; - else if (pNLMsg->nlmsg_type == RTM_DELADDR || pNLMsg->nlmsg_type == RTM_NEWADDR) - result |= 1 << ((struct ifaddrmsg*) NLMSG_DATA(pNLMsg))->ifa_index; - - // Advance pNLMsg to the next message in the buffer - if ((pNLMsg->nlmsg_flags & NLM_F_MULTI) != 0 && pNLMsg->nlmsg_type != NLMSG_DONE) - { - ssize_t len = readCount - ((char*)pNLMsg - buff); - pNLMsg = NLMSG_NEXT(pNLMsg, len); - } - else - break; // all done! - } - - return result; - } - -#else // USES_NETLINK - -// Open a socket that will receive interface change notifications -mDNSlocal mStatus OpenIfNotifySocket(int *pFD) - { - *pFD = socket(AF_ROUTE, SOCK_RAW, 0); - - if (*pFD < 0) - return mStatus_UnknownErr; - - // Configure read to be non-blocking because inbound msg size is not known in advance - (void) fcntl(*pFD, F_SETFL, O_NONBLOCK); - - return mStatus_NoError; - } - -#if MDNS_DEBUGMSGS -mDNSlocal void PrintRoutingSocketMsg(const struct ifa_msghdr *pRSMsg) - { - const char *kRSMsgTypes[] = { "", "RTM_ADD", "RTM_DELETE", "RTM_CHANGE", "RTM_GET", "RTM_LOSING", - "RTM_REDIRECT", "RTM_MISS", "RTM_LOCK", "RTM_OLDADD", "RTM_OLDDEL", "RTM_RESOLVE", - "RTM_NEWADDR", "RTM_DELADDR", "RTM_IFINFO", "RTM_NEWMADDR", "RTM_DELMADDR" }; - - int index = pRSMsg->ifam_type == RTM_IFINFO ? ((struct if_msghdr*) pRSMsg)->ifm_index : pRSMsg->ifam_index; - - printf("ifa_msghdr len=%d, type=%s, index=%d\n", pRSMsg->ifam_msglen, kRSMsgTypes[pRSMsg->ifam_type], index); - } -#endif - -mDNSlocal mDNSu32 ProcessRoutingNotification(int sd) -// Read through the messages on sd and if any indicate that any interface records should -// be torn down and rebuilt, return affected indices as a bitmask. Otherwise return 0. - { - ssize_t readCount; - char buff[4096]; - struct ifa_msghdr *pRSMsg = (struct ifa_msghdr*) buff; - mDNSu32 result = 0; - - readCount = read(sd, buff, sizeof buff); - if (readCount < (ssize_t) sizeof(struct ifa_msghdr)) - return mStatus_UnsupportedErr; // cannot decipher message - -#if MDNS_DEBUGMSGS - PrintRoutingSocketMsg(pRSMsg); -#endif - - // Process the message - if (pRSMsg->ifam_type == RTM_NEWADDR || pRSMsg->ifam_type == RTM_DELADDR || - pRSMsg->ifam_type == RTM_IFINFO) - { - if (pRSMsg->ifam_type == RTM_IFINFO) - result |= 1 << ((struct if_msghdr*) pRSMsg)->ifm_index; - else - result |= 1 << pRSMsg->ifam_index; - } - - return result; - } - -#endif // USES_NETLINK - -// Called when data appears on interface change notification socket -mDNSlocal void InterfaceChangeCallback(int fd, short filter, void *context) - { - IfChangeRec *pChgRec = (IfChangeRec*) context; - fd_set readFDs; - mDNSu32 changedInterfaces = 0; - struct timeval zeroTimeout = { 0, 0 }; - - (void)fd; // Unused - (void)filter; // Unused - - FD_ZERO(&readFDs); - FD_SET(pChgRec->NotifySD, &readFDs); - - do - { - changedInterfaces |= ProcessRoutingNotification(pChgRec->NotifySD); - } - while (0 < select(pChgRec->NotifySD + 1, &readFDs, (fd_set*) NULL, (fd_set*) NULL, &zeroTimeout)); - - // Currently we rebuild the entire interface list whenever any interface change is - // detected. If this ever proves to be a performance issue in a multi-homed - // configuration, more care should be paid to changedInterfaces. - if (changedInterfaces) - mDNSPlatformPosixRefreshInterfaceList(pChgRec->mDNS); - } - -// Register with either a Routing Socket or RtNetLink to listen for interface changes. -mDNSlocal mStatus WatchForInterfaceChange(mDNS *const m) - { - mStatus err; - IfChangeRec *pChgRec; - - pChgRec = (IfChangeRec*) mDNSPlatformMemAllocate(sizeof *pChgRec); - if (pChgRec == NULL) - return mStatus_NoMemoryErr; - - pChgRec->mDNS = m; - err = OpenIfNotifySocket(&pChgRec->NotifySD); - if (err == 0) - err = mDNSPosixAddFDToEventLoop(pChgRec->NotifySD, InterfaceChangeCallback, pChgRec); - - return err; - } - -// Test to see if we're the first client running on UDP port 5353, by trying to bind to 5353 without using SO_REUSEPORT. -// If we fail, someone else got here first. That's not a big problem; we can share the port for multicast responses -- -// we just need to be aware that we shouldn't expect to successfully receive unicast UDP responses. -mDNSlocal mDNSBool mDNSPlatformInit_CanReceiveUnicast(void) - { - int err; - int s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); - struct sockaddr_in s5353; - s5353.sin_family = AF_INET; - s5353.sin_port = MulticastDNSPort.NotAnInteger; - s5353.sin_addr.s_addr = 0; - err = bind(s, (struct sockaddr *)&s5353, sizeof(s5353)); - close(s); - if (err) debugf("No unicast UDP responses"); - else debugf("Unicast UDP responses okay"); - return(err == 0); - } - -// mDNS core calls this routine to initialise the platform-specific data. -mDNSexport mStatus mDNSPlatformInit(mDNS *const m) - { - int err = 0; - struct sockaddr sa; - assert(m != NULL); - - if (mDNSPlatformInit_CanReceiveUnicast()) m->CanReceiveUnicastOn5353 = mDNStrue; - - // Tell mDNS core the names of this machine. - - // Set up the nice label - m->nicelabel.c[0] = 0; - GetUserSpecifiedFriendlyComputerName(&m->nicelabel); - if (m->nicelabel.c[0] == 0) MakeDomainLabelFromLiteralString(&m->nicelabel, "Computer"); - - // Set up the RFC 1034-compliant label - m->hostlabel.c[0] = 0; - GetUserSpecifiedRFC1034ComputerName(&m->hostlabel); - if (m->hostlabel.c[0] == 0) MakeDomainLabelFromLiteralString(&m->hostlabel, "Computer"); - - mDNS_SetFQDN(m); - - sa.sa_family = AF_INET; - m->p->unicastSocket4 = -1; - if (err == mStatus_NoError) err = SetupSocket(&sa, zeroIPPort, 0, &m->p->unicastSocket4); -#if HAVE_IPV6 - sa.sa_family = AF_INET6; - m->p->unicastSocket6 = -1; - if (err == mStatus_NoError) err = SetupSocket(&sa, zeroIPPort, 0, &m->p->unicastSocket6); -#endif - - // Tell mDNS core about the network interfaces on this machine. - if (err == mStatus_NoError) err = SetupInterfaceList(m); - - // Tell mDNS core about DNS Servers - mDNS_Lock(m); - if (err == mStatus_NoError) ParseDNSServers(m, uDNS_SERVERS_FILE); - mDNS_Unlock(m); - - if (err == mStatus_NoError) - { - err = WatchForInterfaceChange(m); - // Failure to observe interface changes is non-fatal. - if (err != mStatus_NoError) - { - fprintf(stderr, "mDNS(%d) WARNING: Unable to detect interface changes (%d).\n", getpid(), err); - err = mStatus_NoError; - } - } - - // We don't do asynchronous initialization on the Posix platform, so by the time - // we get here the setup will already have succeeded or failed. If it succeeded, - // we should just call mDNSCoreInitComplete() immediately. - if (err == mStatus_NoError) - mDNSCoreInitComplete(m, mStatus_NoError); - - return PosixErrorToStatus(err); - } - -// mDNS core calls this routine to clean up the platform-specific data. -// In our case all we need to do is to tear down every network interface. -mDNSexport void mDNSPlatformClose(mDNS *const m) - { - assert(m != NULL); - ClearInterfaceList(m); - if (m->p->unicastSocket4 != -1) assert(close(m->p->unicastSocket4) == 0); -#if HAVE_IPV6 - if (m->p->unicastSocket6 != -1) assert(close(m->p->unicastSocket6) == 0); -#endif - } - -mDNSexport mStatus mDNSPlatformPosixRefreshInterfaceList(mDNS *const m) - { - int err; - ClearInterfaceList(m); - err = SetupInterfaceList(m); - return PosixErrorToStatus(err); - } - -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark ***** Locking -#endif - -// On the Posix platform, locking is a no-op because we only ever enter -// mDNS core on the main thread. - -// mDNS core calls this routine when it wants to prevent -// the platform from reentering mDNS core code. -mDNSexport void mDNSPlatformLock (const mDNS *const m) - { - (void) m; // Unused - } - -// mDNS core calls this routine when it release the lock taken by -// mDNSPlatformLock and allow the platform to reenter mDNS core code. -mDNSexport void mDNSPlatformUnlock (const mDNS *const m) - { - (void) m; // Unused - } - -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark ***** Strings -#endif - -// mDNS core calls this routine to copy C strings. -// On the Posix platform this maps directly to the ANSI C strcpy. -mDNSexport void mDNSPlatformStrCopy(void *dst, const void *src) - { - strcpy((char *)dst, (char *)src); - } - -// mDNS core calls this routine to get the length of a C string. -// On the Posix platform this maps directly to the ANSI C strlen. -mDNSexport mDNSu32 mDNSPlatformStrLen (const void *src) - { - return strlen((char*)src); - } - -// mDNS core calls this routine to copy memory. -// On the Posix platform this maps directly to the ANSI C memcpy. -mDNSexport void mDNSPlatformMemCopy(void *dst, const void *src, mDNSu32 len) - { - memcpy(dst, src, len); - } - -// mDNS core calls this routine to test whether blocks of memory are byte-for-byte -// identical. On the Posix platform this is a simple wrapper around ANSI C memcmp. -mDNSexport mDNSBool mDNSPlatformMemSame(const void *dst, const void *src, mDNSu32 len) - { - return memcmp(dst, src, len) == 0; - } - -// mDNS core calls this routine to clear blocks of memory. -// On the Posix platform this is a simple wrapper around ANSI C memset. -mDNSexport void mDNSPlatformMemZero(void *dst, mDNSu32 len) - { - memset(dst, 0, len); - } - -mDNSexport void * mDNSPlatformMemAllocate(mDNSu32 len) { return(malloc(len)); } -mDNSexport void mDNSPlatformMemFree (void *mem) { free(mem); } - -mDNSexport mDNSu32 mDNSPlatformRandomSeed(void) - { - struct timeval tv; - gettimeofday(&tv, NULL); - return(tv.tv_usec); - } - -mDNSexport mDNSs32 mDNSPlatformOneSecond = 1024; - -mDNSexport mStatus mDNSPlatformTimeInit(void) - { - // No special setup is required on Posix -- we just use gettimeofday(); - // This is not really safe, because gettimeofday can go backwards if the user manually changes the date or time - // We should find a better way to do this - return(mStatus_NoError); - } - -mDNSexport mDNSs32 mDNSPlatformRawTime() - { - struct timeval tv; - gettimeofday(&tv, NULL); - // tv.tv_sec is seconds since 1st January 1970 (GMT, with no adjustment for daylight savings time) - // tv.tv_usec is microseconds since the start of this second (i.e. values 0 to 999999) - // We use the lower 22 bits of tv.tv_sec for the top 22 bits of our result - // and we multiply tv.tv_usec by 16 / 15625 to get a value in the range 0-1023 to go in the bottom 10 bits. - // This gives us a proper modular (cyclic) counter that has a resolution of roughly 1ms (actually 1/1024 second) - // and correctly cycles every 2^22 seconds (4194304 seconds = approx 48 days). - return((tv.tv_sec << 10) | (tv.tv_usec * 16 / 15625)); - } - -mDNSexport mDNSs32 mDNSPlatformUTC(void) - { - return time(NULL); - } - -mDNSexport void mDNSPlatformSendWakeupPacket(mDNS *const m, mDNSInterfaceID InterfaceID, char *EthAddr, char *IPAddr, int iteration) - { - (void) m; - (void) InterfaceID; - (void) EthAddr; - (void) IPAddr; - (void) iteration; - } - -mDNSexport mDNSBool mDNSPlatformValidRecordForInterface(AuthRecord *rr, const NetworkInterfaceInfo *intf) - { - (void) rr; - (void) intf; - - return 1; - } - -mDNSlocal void mDNSPosixAddToFDSet(int *nfds, fd_set *readfds, int s) - { - if (*nfds < s + 1) *nfds = s + 1; - FD_SET(s, readfds); - } - -mDNSexport void mDNSPosixGetFDSet(mDNS *m, int *nfds, fd_set *readfds, struct timeval *timeout) - { - mDNSs32 ticks; - struct timeval interval; - - // 1. Call mDNS_Execute() to let mDNSCore do what it needs to do - mDNSs32 nextevent = mDNS_Execute(m); - - // 2. Build our list of active file descriptors - PosixNetworkInterface *info = (PosixNetworkInterface *)(m->HostInterfaces); - if (m->p->unicastSocket4 != -1) mDNSPosixAddToFDSet(nfds, readfds, m->p->unicastSocket4); -#if HAVE_IPV6 - if (m->p->unicastSocket6 != -1) mDNSPosixAddToFDSet(nfds, readfds, m->p->unicastSocket6); -#endif - while (info) - { - if (info->multicastSocket4 != -1) mDNSPosixAddToFDSet(nfds, readfds, info->multicastSocket4); -#if HAVE_IPV6 - if (info->multicastSocket6 != -1) mDNSPosixAddToFDSet(nfds, readfds, info->multicastSocket6); -#endif - info = (PosixNetworkInterface *)(info->coreIntf.next); - } - - // 3. Calculate the time remaining to the next scheduled event (in struct timeval format) - ticks = nextevent - mDNS_TimeNow(m); - if (ticks < 1) ticks = 1; - interval.tv_sec = ticks >> 10; // The high 22 bits are seconds - interval.tv_usec = ((ticks & 0x3FF) * 15625) / 16; // The low 10 bits are 1024ths - - // 4. If client's proposed timeout is more than what we want, then reduce it - if (timeout->tv_sec > interval.tv_sec || - (timeout->tv_sec == interval.tv_sec && timeout->tv_usec > interval.tv_usec)) - *timeout = interval; - } - -mDNSexport void mDNSPosixProcessFDSet(mDNS *const m, fd_set *readfds) - { - PosixNetworkInterface *info; - assert(m != NULL); - assert(readfds != NULL); - info = (PosixNetworkInterface *)(m->HostInterfaces); - - if (m->p->unicastSocket4 != -1 && FD_ISSET(m->p->unicastSocket4, readfds)) - { - FD_CLR(m->p->unicastSocket4, readfds); - SocketDataReady(m, NULL, m->p->unicastSocket4); - } -#if HAVE_IPV6 - if (m->p->unicastSocket6 != -1 && FD_ISSET(m->p->unicastSocket6, readfds)) - { - FD_CLR(m->p->unicastSocket6, readfds); - SocketDataReady(m, NULL, m->p->unicastSocket6); - } -#endif - - while (info) - { - if (info->multicastSocket4 != -1 && FD_ISSET(info->multicastSocket4, readfds)) - { - FD_CLR(info->multicastSocket4, readfds); - SocketDataReady(m, info, info->multicastSocket4); - } -#if HAVE_IPV6 - if (info->multicastSocket6 != -1 && FD_ISSET(info->multicastSocket6, readfds)) - { - FD_CLR(info->multicastSocket6, readfds); - SocketDataReady(m, info, info->multicastSocket6); - } -#endif - info = (PosixNetworkInterface *)(info->coreIntf.next); - } - } - -// update gMaxFD -mDNSlocal void DetermineMaxEventFD(void) - { - PosixEventSource *iSource; - - gMaxFD = 0; - for (iSource=(PosixEventSource*)gEventSources.Head; iSource; iSource = iSource->Next) - if (gMaxFD < iSource->fd) - gMaxFD = iSource->fd; - } - -// Add a file descriptor to the set that mDNSPosixRunEventLoopOnce() listens to. -mStatus mDNSPosixAddFDToEventLoop(int fd, mDNSPosixEventCallback callback, void *context) - { - PosixEventSource *newSource; - - if (gEventSources.LinkOffset == 0) - InitLinkedList(&gEventSources, offsetof(PosixEventSource, Next)); - - if (fd >= (int) FD_SETSIZE || fd < 0) - return mStatus_UnsupportedErr; - if (callback == NULL) - return mStatus_BadParamErr; - - newSource = (PosixEventSource*) malloc(sizeof *newSource); - if (NULL == newSource) - return mStatus_NoMemoryErr; - - newSource->Callback = callback; - newSource->Context = context; - newSource->fd = fd; - - AddToTail(&gEventSources, newSource); - FD_SET(fd, &gEventFDs); - - DetermineMaxEventFD(); - - return mStatus_NoError; - } - -// Remove a file descriptor from the set that mDNSPosixRunEventLoopOnce() listens to. -mStatus mDNSPosixRemoveFDFromEventLoop(int fd) - { - PosixEventSource *iSource; - - for (iSource=(PosixEventSource*)gEventSources.Head; iSource; iSource = iSource->Next) - { - if (fd == iSource->fd) - { - FD_CLR(fd, &gEventFDs); - RemoveFromList(&gEventSources, iSource); - free(iSource); - DetermineMaxEventFD(); - return mStatus_NoError; - } - } - return mStatus_NoSuchNameErr; - } - -// Simply note the received signal in gEventSignals. -mDNSlocal void NoteSignal(int signum) - { - sigaddset(&gEventSignals, signum); - } - -// Tell the event package to listen for signal and report it in mDNSPosixRunEventLoopOnce(). -mStatus mDNSPosixListenForSignalInEventLoop(int signum) - { - struct sigaction action; - mStatus err; - - mDNSPlatformMemZero(&action, sizeof action); // more portable than member-wise assignment - action.sa_handler = NoteSignal; - err = sigaction(signum, &action, (struct sigaction*) NULL); - - sigaddset(&gEventSignalSet, signum); - - return err; - } - -// Tell the event package to stop listening for signal in mDNSPosixRunEventLoopOnce(). -mStatus mDNSPosixIgnoreSignalInEventLoop(int signum) - { - struct sigaction action; - mStatus err; - - mDNSPlatformMemZero(&action, sizeof action); // more portable than member-wise assignment - action.sa_handler = SIG_DFL; - err = sigaction(signum, &action, (struct sigaction*) NULL); - - sigdelset(&gEventSignalSet, signum); - - return err; - } - -// Do a single pass through the attendent event sources and dispatch any found to their callbacks. -// Return as soon as internal timeout expires, or a signal we're listening for is received. -mStatus mDNSPosixRunEventLoopOnce(mDNS *m, const struct timeval *pTimeout, - sigset_t *pSignalsReceived, mDNSBool *pDataDispatched) - { - fd_set listenFDs = gEventFDs; - int fdMax = 0, numReady; - struct timeval timeout = *pTimeout; - - // Include the sockets that are listening to the wire in our select() set - mDNSPosixGetFDSet(m, &fdMax, &listenFDs, &timeout); // timeout may get modified - if (fdMax < gMaxFD) - fdMax = gMaxFD; - - numReady = select(fdMax + 1, &listenFDs, (fd_set*) NULL, (fd_set*) NULL, &timeout); - - // If any data appeared, invoke its callback - if (numReady > 0) - { - PosixEventSource *iSource; - - (void) mDNSPosixProcessFDSet(m, &listenFDs); // call this first to process wire data for clients - - for (iSource=(PosixEventSource*)gEventSources.Head; iSource; iSource = iSource->Next) - { - if (FD_ISSET(iSource->fd, &listenFDs)) - { - iSource->Callback(iSource->fd, 0, iSource->Context); - break; // in case callback removed elements from gEventSources - } - } - *pDataDispatched = mDNStrue; - } - else - *pDataDispatched = mDNSfalse; - - (void) sigprocmask(SIG_BLOCK, &gEventSignalSet, (sigset_t*) NULL); - *pSignalsReceived = gEventSignals; - sigemptyset(&gEventSignals); - (void) sigprocmask(SIG_UNBLOCK, &gEventSignalSet, (sigset_t*) NULL); - - return mStatus_NoError; - } diff --git a/src/tools/mdnssd/mDNSPosix.h b/src/tools/mdnssd/mDNSPosix.h deleted file mode 100755 index dab4b11a4c..0000000000 --- a/src/tools/mdnssd/mDNSPosix.h +++ /dev/null @@ -1,85 +0,0 @@ -/* -*- Mode: C; tab-width: 4 -*- - * - * Copyright (c) 2002-2004 Apple Computer, Inc. All rights reserved. - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -#ifndef __mDNSPlatformPosix_h -#define __mDNSPlatformPosix_h - -#include -#include - -#ifdef __cplusplus - extern "C" { -#endif - -// PosixNetworkInterface is a record extension of the core NetworkInterfaceInfo -// type that supports extra fields needed by the Posix platform. -// -// IMPORTANT: coreIntf must be the first field in the structure because -// we cast between pointers to the two different types regularly. - -typedef struct PosixNetworkInterface PosixNetworkInterface; - -struct PosixNetworkInterface - { - NetworkInterfaceInfo coreIntf; - const char * intfName; - PosixNetworkInterface * aliasIntf; - int index; - int multicastSocket4; -#if HAVE_IPV6 - int multicastSocket6; -#endif - }; - -// This is a global because debugf_() needs to be able to check its value -extern int gMDNSPlatformPosixVerboseLevel; - -struct mDNS_PlatformSupport_struct - { - int unicastSocket4; -#if HAVE_IPV6 - int unicastSocket6; -#endif - }; - -#define uDNS_SERVERS_FILE "/etc/resolv.conf" -extern int ParseDNSServers(mDNS *m, const char *filePath); -extern mStatus mDNSPlatformPosixRefreshInterfaceList(mDNS *const m); - // See comment in implementation. - -// Call mDNSPosixGetFDSet before calling select(), to update the parameters -// as may be necessary to meet the needs of the mDNSCore code. -// The timeout pointer MUST NOT be NULL. -// Set timeout->tv_sec to 0x3FFFFFFF if you want to have effectively no timeout -// After calling mDNSPosixGetFDSet(), call select(nfds, &readfds, NULL, NULL, &timeout); as usual -// After select() returns, call mDNSPosixProcessFDSet() to let mDNSCore do its work -extern void mDNSPosixGetFDSet(mDNS *m, int *nfds, fd_set *readfds, struct timeval *timeout); -extern void mDNSPosixProcessFDSet(mDNS *const m, fd_set *readfds); - -typedef void (*mDNSPosixEventCallback)(int fd, short filter, void *context); - -extern mStatus mDNSPosixAddFDToEventLoop( int fd, mDNSPosixEventCallback callback, void *context); -extern mStatus mDNSPosixRemoveFDFromEventLoop( int fd); -extern mStatus mDNSPosixListenForSignalInEventLoop( int signum); -extern mStatus mDNSPosixIgnoreSignalInEventLoop( int signum); -extern mStatus mDNSPosixRunEventLoopOnce( mDNS *m, const struct timeval *pTimeout, sigset_t *pSignalsReceived, mDNSBool *pDataDispatched); - -#ifdef __cplusplus - } -#endif - -#endif diff --git a/src/tools/mdnssd/mDNSUNP.c b/src/tools/mdnssd/mDNSUNP.c deleted file mode 100755 index 8027676cfe..0000000000 --- a/src/tools/mdnssd/mDNSUNP.c +++ /dev/null @@ -1,719 +0,0 @@ -/* -*- Mode: C; tab-width: 4 -*- - * - * Copyright (c) 2002-2004 Apple Computer, Inc. All rights reserved. - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -#include "mDNSUNP.h" - -#include -#include -#include -#include -#include -#include -#include -#include -#include - -/* Some weird platforms derived from 4.4BSD Lite (e.g. EFI) need the ALIGN(P) - macro, usually defined in or someplace like that, to make sure the - CMSG_NXTHDR macro is well-formed. On such platforms, the symbol NEED_ALIGN_MACRO - should be set to the name of the header to include to get the ALIGN(P) macro. -*/ -#ifdef NEED_ALIGN_MACRO -#include NEED_ALIGN_MACRO -#endif - -/* Solaris defined SIOCGIFCONF etc in but - other platforms don't even have that include file. So, - if we haven't yet got a definition, let's try to find - . -*/ - -#ifndef SIOCGIFCONF - #include -#endif - -/* sockaddr_dl is only referenced if we're using IP_RECVIF, - so only include the header in that case. -*/ - -#ifdef IP_RECVIF - #include -#endif - -#if defined(AF_INET6) && HAVE_IPV6 && !HAVE_LINUX -#include -#include -// Note: netinet/in_var.h implicitly includes netinet6/in6_var.h for us -#endif - -#if defined(AF_INET6) && HAVE_IPV6 && HAVE_LINUX -#include -#include - -/* Converts a prefix length to IPv6 network mask */ -void plen_to_mask(int plen, char *addr) { - int i; - int colons=7; /* Number of colons in IPv6 address */ - int bits_in_block=16; /* Bits per IPv6 block */ - for(i=0;i<=colons;i++) { - int block, ones=0xffff, ones_in_block; - if (plen>bits_in_block) ones_in_block=bits_in_block; - else ones_in_block=plen; - block = ones & (ones << (bits_in_block-ones_in_block)); - i==0 ? sprintf(addr, "%x", block) : sprintf(addr, "%s:%x", addr, block); - plen -= ones_in_block; - } - } - -/* Gets IPv6 interface information from the /proc filesystem in linux*/ -struct ifi_info *get_ifi_info_linuxv6(int family, int doaliases) - { - struct ifi_info *ifi, *ifihead, **ifipnext, *ifipold, **ifiptr; - FILE *fp; - char addr[8][5]; - int flags, myflags, index, plen, scope; - char ifname[9], lastname[IFNAMSIZ]; - char addr6[32+7+1]; /* don't forget the seven ':' */ - struct addrinfo hints, *res0; - struct sockaddr_in6 *sin6; - struct in6_addr *addrptr; - int err; - int sockfd = -1; - struct ifreq ifr; - - res0=NULL; - ifihead = NULL; - ifipnext = &ifihead; - lastname[0] = 0; - - if ((fp = fopen(PROC_IFINET6_PATH, "r")) != NULL) { - sockfd = socket(AF_INET6, SOCK_DGRAM, 0); - if (sockfd < 0) { - goto gotError; - } - while (fscanf(fp, - "%4s%4s%4s%4s%4s%4s%4s%4s %02x %02x %02x %02x %8s\n", - addr[0],addr[1],addr[2],addr[3], - addr[4],addr[5],addr[6],addr[7], - &index, &plen, &scope, &flags, ifname) != EOF) { - - myflags = 0; - if (strncmp(lastname, ifname, IFNAMSIZ) == 0) { - if (doaliases == 0) - continue; /* already processed this interface */ - myflags = IFI_ALIAS; - } - memcpy(lastname, ifname, IFNAMSIZ); - ifi = (struct ifi_info*)calloc(1, sizeof(struct ifi_info)); - if (ifi == NULL) { - goto gotError; - } - - ifipold = *ifipnext; /* need this later */ - ifiptr = ifipnext; - *ifipnext = ifi; /* prev points to this new one */ - ifipnext = &ifi->ifi_next; /* pointer to next one goes here */ - - sprintf(addr6, "%s:%s:%s:%s:%s:%s:%s:%s", - addr[0],addr[1],addr[2],addr[3], - addr[4],addr[5],addr[6],addr[7]); - - /* Add address of the interface */ - memset(&hints, 0, sizeof(hints)); - hints.ai_family = AF_INET6; - hints.ai_flags = AI_NUMERICHOST; - err = getaddrinfo(addr6, NULL, &hints, &res0); - if (err) { - goto gotError; - } - ifi->ifi_addr = calloc(1, sizeof(struct sockaddr_in6)); - if (ifi->ifi_addr == NULL) { - goto gotError; - } - memcpy(ifi->ifi_addr, res0->ai_addr, sizeof(struct sockaddr_in6)); - - /* Add netmask of the interface */ - char ipv6addr[INET6_ADDRSTRLEN]; - plen_to_mask(plen, ipv6addr); - ifi->ifi_netmask = calloc(1, sizeof(struct sockaddr_in6)); - if (ifi->ifi_addr == NULL) { - goto gotError; - } - sin6=calloc(1, sizeof(struct sockaddr_in6)); - addrptr=calloc(1, sizeof(struct in6_addr)); - inet_pton(family, ipv6addr, addrptr); - sin6->sin6_family=family; - sin6->sin6_addr=*addrptr; - sin6->sin6_scope_id=scope; - memcpy(ifi->ifi_netmask, sin6, sizeof(struct sockaddr_in6)); - free(sin6); - - - /* Add interface name */ - memcpy(ifi->ifi_name, ifname, IFI_NAME); - - /* Add interface index */ - ifi->ifi_index = index; - - /* Add interface flags*/ - memcpy(ifr.ifr_name, ifname, IFNAMSIZ); - if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) { - if (errno == EADDRNOTAVAIL) { - /* - * If the main interface is configured with no IP address but - * an alias interface exists with an IP address, you get - * EADDRNOTAVAIL for the main interface - */ - free(ifi->ifi_addr); - free(ifi); - ifipnext = ifiptr; - *ifipnext = ifipold; - continue; - } else { - goto gotError; - } - } - ifi->ifi_flags = ifr.ifr_flags; - freeaddrinfo(res0); - res0=NULL; - } - } - goto done; - - gotError: - if (ifihead != NULL) { - free_ifi_info(ifihead); - ifihead = NULL; - } - if (res0 != NULL) { - freeaddrinfo(res0); - res0=NULL; - } - done: - if (sockfd != -1) { - assert(close(sockfd) == 0); - } - return(ifihead); /* pointer to first structure in linked list */ - } -#endif // defined(AF_INET6) && HAVE_IPV6 && HAVE_LINUX - -struct ifi_info *get_ifi_info(int family, int doaliases) -{ - int junk; - struct ifi_info *ifi, *ifihead, **ifipnext, *ifipold, **ifiptr; - int sockfd, sockf6, len, lastlen, flags, myflags; -#ifdef NOT_HAVE_IF_NAMETOINDEX - int index = 200; -#endif - char *ptr, *buf, lastname[IFNAMSIZ], *cptr; - struct ifconf ifc; - struct ifreq *ifr, ifrcopy; - struct sockaddr_in *sinptr; - -#if defined(AF_INET6) && HAVE_IPV6 - struct sockaddr_in6 *sinptr6; -#endif - -#if defined(AF_INET6) && HAVE_IPV6 && HAVE_LINUX - if (family == AF_INET6) return get_ifi_info_linuxv6(family, doaliases); -#endif - - sockfd = -1; - sockf6 = -1; - buf = NULL; - ifihead = NULL; - - sockfd = socket(AF_INET, SOCK_DGRAM, 0); - if (sockfd < 0) { - goto gotError; - } - - lastlen = 0; - len = 100 * sizeof(struct ifreq); /* initial buffer size guess */ - for ( ; ; ) { - buf = (char*)malloc(len); - if (buf == NULL) { - goto gotError; - } - ifc.ifc_len = len; - ifc.ifc_buf = buf; - if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) { - if (errno != EINVAL || lastlen != 0) { - goto gotError; - } - } else { - if (ifc.ifc_len == lastlen) - break; /* success, len has not changed */ - lastlen = ifc.ifc_len; - } - len += 10 * sizeof(struct ifreq); /* increment */ - free(buf); - } - ifihead = NULL; - ifipnext = &ifihead; - lastname[0] = 0; -/* end get_ifi_info1 */ - -/* include get_ifi_info2 */ - for (ptr = buf; ptr < buf + ifc.ifc_len; ) { - ifr = (struct ifreq *) ptr; - - /* Advance to next one in buffer */ - if (sizeof(struct ifreq) > sizeof(ifr->ifr_name) + GET_SA_LEN(ifr->ifr_addr)) - ptr += sizeof(struct ifreq); - else - ptr += sizeof(ifr->ifr_name) + GET_SA_LEN(ifr->ifr_addr); - -// fprintf(stderr, "intf %p name=%s AF=%d\n", index, ifr->ifr_name, ifr->ifr_addr.sa_family); - - if (ifr->ifr_addr.sa_family != family) - continue; /* ignore if not desired address family */ - - myflags = 0; - if ( (cptr = strchr(ifr->ifr_name, ':')) != NULL) - *cptr = 0; /* replace colon will null */ - if (strncmp(lastname, ifr->ifr_name, IFNAMSIZ) == 0) { - if (doaliases == 0) - continue; /* already processed this interface */ - myflags = IFI_ALIAS; - } - memcpy(lastname, ifr->ifr_name, IFNAMSIZ); - - ifrcopy = *ifr; - if (ioctl(sockfd, SIOCGIFFLAGS, &ifrcopy) < 0) { - goto gotError; - } - - flags = ifrcopy.ifr_flags; - if ((flags & IFF_UP) == 0) - continue; /* ignore if interface not up */ - - ifi = (struct ifi_info*)calloc(1, sizeof(struct ifi_info)); - if (ifi == NULL) { - goto gotError; - } - ifipold = *ifipnext; /* need this later */ - ifiptr = ifipnext; - *ifipnext = ifi; /* prev points to this new one */ - ifipnext = &ifi->ifi_next; /* pointer to next one goes here */ - - ifi->ifi_flags = flags; /* IFF_xxx values */ - ifi->ifi_myflags = myflags; /* IFI_xxx values */ -#ifndef NOT_HAVE_IF_NAMETOINDEX - ifi->ifi_index = if_nametoindex(ifr->ifr_name); -#else - ifrcopy = *ifr; -#ifdef SIOCGIFINDEX - if ( 0 >= ioctl(sockfd, SIOCGIFINDEX, &ifrcopy)) - ifi->ifi_index = ifrcopy.ifr_index; - else -#endif - ifi->ifi_index = index++; /* SIOCGIFINDEX is broken on Solaris 2.5ish, so fake it */ -#endif - memcpy(ifi->ifi_name, ifr->ifr_name, IFI_NAME); - ifi->ifi_name[IFI_NAME-1] = '\0'; -/* end get_ifi_info2 */ -/* include get_ifi_info3 */ - switch (ifr->ifr_addr.sa_family) { - case AF_INET: - sinptr = (struct sockaddr_in *) &ifr->ifr_addr; - if (ifi->ifi_addr == NULL) { - ifi->ifi_addr = (struct sockaddr*)calloc(1, sizeof(struct sockaddr_in)); - if (ifi->ifi_addr == NULL) { - goto gotError; - } - memcpy(ifi->ifi_addr, sinptr, sizeof(struct sockaddr_in)); - -#ifdef SIOCGIFNETMASK - if (ioctl(sockfd, SIOCGIFNETMASK, &ifrcopy) < 0) { - if (errno == EADDRNOTAVAIL) { - /* - * If the main interface is configured with no IP address but - * an alias interface exists with an IP address, you get - * EADDRNOTAVAIL for the main interface - */ - free(ifi->ifi_addr); - free(ifi); - ifipnext = ifiptr; - *ifipnext = ifipold; - continue; - } else { - goto gotError; - } - } - - ifi->ifi_netmask = (struct sockaddr*)calloc(1, sizeof(struct sockaddr_in)); - if (ifi->ifi_netmask == NULL) goto gotError; - sinptr = (struct sockaddr_in *) &ifrcopy.ifr_addr; - /* The BSD ioctls (including Mac OS X) stick some weird values in for sin_len and sin_family */ -#ifndef NOT_HAVE_SA_LEN - sinptr->sin_len = sizeof(struct sockaddr_in); -#endif - sinptr->sin_family = AF_INET; - memcpy(ifi->ifi_netmask, sinptr, sizeof(struct sockaddr_in)); -#endif - -#ifdef SIOCGIFBRDADDR - if (flags & IFF_BROADCAST) { - if (ioctl(sockfd, SIOCGIFBRDADDR, &ifrcopy) < 0) { - goto gotError; - } - sinptr = (struct sockaddr_in *) &ifrcopy.ifr_broadaddr; - /* The BSD ioctls (including Mac OS X) stick some weird values in for sin_len and sin_family */ -#ifndef NOT_HAVE_SA_LEN - sinptr->sin_len = sizeof( struct sockaddr_in ); -#endif - sinptr->sin_family = AF_INET; - ifi->ifi_brdaddr = (struct sockaddr*)calloc(1, sizeof(struct sockaddr_in)); - if (ifi->ifi_brdaddr == NULL) { - goto gotError; - } - memcpy(ifi->ifi_brdaddr, sinptr, sizeof(struct sockaddr_in)); - } -#endif - -#ifdef SIOCGIFDSTADDR - if (flags & IFF_POINTOPOINT) { - if (ioctl(sockfd, SIOCGIFDSTADDR, &ifrcopy) < 0) { - goto gotError; - } - sinptr = (struct sockaddr_in *) &ifrcopy.ifr_dstaddr; - /* The BSD ioctls (including Mac OS X) stick some weird values in for sin_len and sin_family */ -#ifndef NOT_HAVE_SA_LEN - sinptr->sin_len = sizeof( struct sockaddr_in ); -#endif - sinptr->sin_family = AF_INET; - ifi->ifi_dstaddr = (struct sockaddr*)calloc(1, sizeof(struct sockaddr_in)); - if (ifi->ifi_dstaddr == NULL) { - goto gotError; - } - memcpy(ifi->ifi_dstaddr, sinptr, sizeof(struct sockaddr_in)); - } -#endif - } - break; - -#if defined(AF_INET6) && HAVE_IPV6 - case AF_INET6: - sinptr6 = (struct sockaddr_in6 *) &ifr->ifr_addr; - if (ifi->ifi_addr == NULL) { - ifi->ifi_addr = calloc(1, sizeof(struct sockaddr_in6)); - if (ifi->ifi_addr == NULL) { - goto gotError; - } - - /* Some platforms (*BSD) inject the prefix in IPv6LL addresses */ - /* We need to strip that out */ - if (IN6_IS_ADDR_LINKLOCAL(&sinptr6->sin6_addr)) - sinptr6->sin6_addr.s6_addr[2] = sinptr6->sin6_addr.s6_addr[3] = 0; - memcpy(ifi->ifi_addr, sinptr6, sizeof(struct sockaddr_in6)); - -#ifdef SIOCGIFNETMASK_IN6 - { - struct in6_ifreq ifr6; - if (sockf6 == -1) - sockf6 = socket(AF_INET6, SOCK_DGRAM, 0); - memset(&ifr6, 0, sizeof(ifr6)); - memcpy(&ifr6.ifr_name, &ifr->ifr_name, sizeof(ifr6.ifr_name )); - memcpy(&ifr6.ifr_ifru.ifru_addr, &ifr->ifr_addr, sizeof(ifr6.ifr_ifru.ifru_addr)); - if (ioctl(sockf6, SIOCGIFNETMASK_IN6, &ifr6) < 0) { - if (errno == EADDRNOTAVAIL) { - /* - * If the main interface is configured with no IP address but - * an alias interface exists with an IP address, you get - * EADDRNOTAVAIL for the main interface - */ - free(ifi->ifi_addr); - free(ifi); - ifipnext = ifiptr; - *ifipnext = ifipold; - continue; - } else { - goto gotError; - } - } - ifi->ifi_netmask = (struct sockaddr*)calloc(1, sizeof(struct sockaddr_in6)); - if (ifi->ifi_netmask == NULL) goto gotError; - sinptr6 = (struct sockaddr_in6 *) &ifr6.ifr_ifru.ifru_addr; - memcpy(ifi->ifi_netmask, sinptr6, sizeof(struct sockaddr_in6)); - } -#endif - } - break; -#endif - - default: - break; - } - } - goto done; - -gotError: - if (ifihead != NULL) { - free_ifi_info(ifihead); - ifihead = NULL; - } - -done: - if (buf != NULL) { - free(buf); - } - if (sockfd != -1) { - junk = close(sockfd); - assert(junk == 0); - } - if (sockf6 != -1) { - junk = close(sockf6); - assert(junk == 0); - } - return(ifihead); /* pointer to first structure in linked list */ -} -/* end get_ifi_info3 */ - -/* include free_ifi_info */ -void -free_ifi_info(struct ifi_info *ifihead) -{ - struct ifi_info *ifi, *ifinext; - - for (ifi = ifihead; ifi != NULL; ifi = ifinext) { - if (ifi->ifi_addr != NULL) - free(ifi->ifi_addr); - if (ifi->ifi_netmask != NULL) - free(ifi->ifi_netmask); - if (ifi->ifi_brdaddr != NULL) - free(ifi->ifi_brdaddr); - if (ifi->ifi_dstaddr != NULL) - free(ifi->ifi_dstaddr); - ifinext = ifi->ifi_next; /* can't fetch ifi_next after free() */ - free(ifi); /* the ifi_info{} itself */ - } -} -/* end free_ifi_info */ - -ssize_t -recvfrom_flags(int fd, void *ptr, size_t nbytes, int *flagsp, - struct sockaddr *sa, socklen_t *salenptr, struct my_in_pktinfo *pktp, u_char *ttl) -{ - struct msghdr msg; - struct iovec iov[1]; - ssize_t n; - -#ifdef CMSG_FIRSTHDR - struct cmsghdr *cmptr; - union { - struct cmsghdr cm; - char control[1024]; - } control_un; - - *ttl = 255; // If kernel fails to provide TTL data then assume the TTL was 255 as it should be - - msg.msg_control = control_un.control; - msg.msg_controllen = sizeof(control_un.control); - msg.msg_flags = 0; -#else - memset(&msg, 0, sizeof(msg)); /* make certain msg_accrightslen = 0 */ -#endif /* CMSG_FIRSTHDR */ - - msg.msg_name = (char *) sa; - msg.msg_namelen = *salenptr; - iov[0].iov_base = (char *)ptr; - iov[0].iov_len = nbytes; - msg.msg_iov = iov; - msg.msg_iovlen = 1; - - if ( (n = recvmsg(fd, &msg, *flagsp)) < 0) - return(n); - - *salenptr = msg.msg_namelen; /* pass back results */ - if (pktp) { - /* 0.0.0.0, i/f = -1 */ - /* We set the interface to -1 so that the caller can - tell whether we returned a meaningful value or - just some default. Previously this code just - set the value to 0, but I'm concerned that 0 - might be a valid interface value. - */ - memset(pktp, 0, sizeof(struct my_in_pktinfo)); - pktp->ipi_ifindex = -1; - } -/* end recvfrom_flags1 */ - -/* include recvfrom_flags2 */ -#ifndef CMSG_FIRSTHDR - #warning CMSG_FIRSTHDR not defined. Will not be able to determine destination address, received interface, etc. - *flagsp = 0; /* pass back results */ - return(n); -#else - - *flagsp = msg.msg_flags; /* pass back results */ - if (msg.msg_controllen < (socklen_t)sizeof(struct cmsghdr) || - (msg.msg_flags & MSG_CTRUNC) || pktp == NULL) - return(n); - - for (cmptr = CMSG_FIRSTHDR(&msg); cmptr != NULL; - cmptr = CMSG_NXTHDR(&msg, cmptr)) { - -#ifdef IP_PKTINFO -#if in_pktinfo_definition_is_missing -struct in_pktinfo -{ - int ipi_ifindex; - struct in_addr ipi_spec_dst; - struct in_addr ipi_addr; -}; -#endif - if (cmptr->cmsg_level == IPPROTO_IP && - cmptr->cmsg_type == IP_PKTINFO) { - struct in_pktinfo *tmp; - struct sockaddr_in *sin = (struct sockaddr_in*)&pktp->ipi_addr; - - tmp = (struct in_pktinfo *) CMSG_DATA(cmptr); - sin->sin_family = AF_INET; - sin->sin_addr = tmp->ipi_addr; - sin->sin_port = 0; - pktp->ipi_ifindex = tmp->ipi_ifindex; - continue; - } -#endif - -#ifdef IP_RECVDSTADDR - if (cmptr->cmsg_level == IPPROTO_IP && - cmptr->cmsg_type == IP_RECVDSTADDR) { - struct sockaddr_in *sin = (struct sockaddr_in*)&pktp->ipi_addr; - - sin->sin_family = AF_INET; - sin->sin_addr = *(struct in_addr*)CMSG_DATA(cmptr); - sin->sin_port = 0; - continue; - } -#endif - -#ifdef IP_RECVIF - if (cmptr->cmsg_level == IPPROTO_IP && - cmptr->cmsg_type == IP_RECVIF) { - struct sockaddr_dl *sdl = (struct sockaddr_dl *) CMSG_DATA(cmptr); -#ifndef HAVE_BROKEN_RECVIF_NAME - int nameLen = (sdl->sdl_nlen < IFI_NAME - 1) ? sdl->sdl_nlen : (IFI_NAME - 1); - strncpy(pktp->ipi_ifname, sdl->sdl_data, nameLen); -#endif - pktp->ipi_ifindex = sdl->sdl_index; -#ifdef HAVE_BROKEN_RECVIF_NAME - if (sdl->sdl_index == 0) { - pktp->ipi_ifindex = *(uint_t*)sdl; - } -#endif - assert(pktp->ipi_ifname[IFI_NAME - 1] == 0); - // null terminated because of memset above - continue; - } -#endif - -#ifdef IP_RECVTTL - if (cmptr->cmsg_level == IPPROTO_IP && - cmptr->cmsg_type == IP_RECVTTL) { - *ttl = *(u_char*)CMSG_DATA(cmptr); - continue; - } - else if (cmptr->cmsg_level == IPPROTO_IP && - cmptr->cmsg_type == IP_TTL) { // some implementations seem to send IP_TTL instead of IP_RECVTTL - *ttl = *(int*)CMSG_DATA(cmptr); - continue; - } -#endif - -#if defined(IPV6_PKTINFO) && HAVE_IPV6 - if (cmptr->cmsg_level == IPPROTO_IPV6 && - cmptr->cmsg_type == IPV6_2292_PKTINFO) { - struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)&pktp->ipi_addr; - struct in6_pktinfo *ip6_info = (struct in6_pktinfo*)CMSG_DATA(cmptr); - - sin6->sin6_family = AF_INET6; -#ifndef NOT_HAVE_SA_LEN - sin6->sin6_len = sizeof(*sin6); -#endif - sin6->sin6_addr = ip6_info->ipi6_addr; - sin6->sin6_flowinfo = 0; - sin6->sin6_scope_id = 0; - sin6->sin6_port = 0; - pktp->ipi_ifindex = ip6_info->ipi6_ifindex; - continue; - } -#endif - -#if defined(IPV6_HOPLIMIT) && HAVE_IPV6 - if (cmptr->cmsg_level == IPPROTO_IPV6 && - cmptr->cmsg_type == IPV6_2292_HOPLIMIT) { - *ttl = *(int*)CMSG_DATA(cmptr); - continue; - } -#endif - assert(0); // unknown ancillary data - } - return(n); -#endif /* CMSG_FIRSTHDR */ -} - -// ********************************************************************************************** - -// daemonize the process. Adapted from "Unix Network Programming" vol 1 by Stevens, section 12.4. -// Returns 0 on success, -1 on failure. - -#ifdef NOT_HAVE_DAEMON -#include -#include -#include - -int daemon(int nochdir, int noclose) - { - switch (fork()) - { - case -1: return (-1); // Fork failed - case 0: break; // Child -- continue - default: _exit(0); // Parent -- exit - } - - if (setsid() == -1) return(-1); - - signal(SIGHUP, SIG_IGN); - - switch (fork()) // Fork again, primarily for reasons of Unix trivia - { - case -1: return (-1); // Fork failed - case 0: break; // Child -- continue - default: _exit(0); // Parent -- exit - } - - if (!nochdir) (void)chdir("/"); - umask(0); - - if (!noclose) - { - int fd = open("/dev/null", O_RDWR, 0); - if (fd != -1) - { - // Avoid unnecessarily duplicating a file descriptor to itself - if (fd != STDIN_FILENO) (void)dup2(fd, STDIN_FILENO); - if (fd != STDOUT_FILENO) (void)dup2(fd, STDOUT_FILENO); - if (fd != STDERR_FILENO) (void)dup2(fd, STDERR_FILENO); - if (fd != STDIN_FILENO && fd != STDOUT_FILENO && fd != STDERR_FILENO) - (void)close (fd); - } - } - return (0); - } -#endif /* NOT_HAVE_DAEMON */ diff --git a/src/tools/mdnssd/mDNSUNP.h b/src/tools/mdnssd/mDNSUNP.h deleted file mode 100755 index 6b04601f50..0000000000 --- a/src/tools/mdnssd/mDNSUNP.h +++ /dev/null @@ -1,130 +0,0 @@ -/* -*- Mode: C; tab-width: 4 -*- - * - * Copyright (c) 2002-2004 Apple Computer, Inc. All rights reserved. - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -#ifndef __mDNSUNP_h -#define __mDNSUNP_h - -#include -#include -#include -#include - -#ifdef HAVE_LINUX -#include -#define IPV6_2292_PKTINFO IPV6_2292PKTINFO -#define IPV6_2292_HOPLIMIT IPV6_2292HOPLIMIT -#else -// The following are the supported non-linux posix OSes - -// netbsd, freebsd and openbsd. -#if HAVE_IPV6 -#define IPV6_2292_PKTINFO 19 -#define IPV6_2292_HOPLIMIT 20 -#endif -#endif - -#ifdef __cplusplus - extern "C" { -#endif - -#ifdef NOT_HAVE_SOCKLEN_T - typedef unsigned int socklen_t; -#endif - -#if !defined(_SS_MAXSIZE) -#if HAVE_IPV6 -#define sockaddr_storage sockaddr_in6 -#else -#define sockaddr_storage sockaddr -#endif // HAVE_IPV6 -#endif // !defined(_SS_MAXSIZE) - -#ifndef NOT_HAVE_SA_LEN -#define GET_SA_LEN(X) (sizeof(struct sockaddr) > ((struct sockaddr*)&(X))->sa_len ? \ - sizeof(struct sockaddr) : ((struct sockaddr*)&(X))->sa_len ) -#elif HAVE_IPV6 -#define GET_SA_LEN(X) (((struct sockaddr*)&(X))->sa_family == AF_INET ? sizeof(struct sockaddr_in) : \ - ((struct sockaddr*)&(X))->sa_family == AF_INET6 ? sizeof(struct sockaddr_in6) : sizeof(struct sockaddr)) -#else -#define GET_SA_LEN(X) (((struct sockaddr*)&(X))->sa_family == AF_INET ? sizeof(struct sockaddr_in) : sizeof(struct sockaddr)) -#endif - -#define IFI_NAME 16 /* same as IFNAMSIZ in */ -#define IFI_HADDR 8 /* allow for 64-bit EUI-64 in future */ - -// Renamed from my_in_pktinfo because in_pktinfo is used by Linux. - -struct my_in_pktinfo { - struct sockaddr_storage ipi_addr; - int ipi_ifindex; /* received interface index */ - char ipi_ifname[IFI_NAME]; /* received interface name */ -}; - -/* From the text (Stevens, section 20.2): */ -/* 'As an example of recvmsg we will write a function named recvfrom_flags that */ -/* is similar to recvfrom but also returns: */ -/* 1. the returned msg_flags value, */ -/* 2. the destination addres of the received datagram (from the IP_RECVDSTADDR socket option, and */ -/* 3. the index of the interface on which the datagram was received (the IP_RECVIF socket option).' */ -extern ssize_t recvfrom_flags(int fd, void *ptr, size_t nbytes, int *flagsp, - struct sockaddr *sa, socklen_t *salenptr, struct my_in_pktinfo *pktp, u_char *ttl); - -struct ifi_info { - char ifi_name[IFI_NAME]; /* interface name, null terminated */ - u_char ifi_haddr[IFI_HADDR]; /* hardware address */ - u_short ifi_hlen; /* #bytes in hardware address: 0, 6, 8 */ - short ifi_flags; /* IFF_xxx constants from */ - short ifi_myflags; /* our own IFI_xxx flags */ - int ifi_index; /* interface index */ - struct sockaddr *ifi_addr; /* primary address */ - struct sockaddr *ifi_netmask; - struct sockaddr *ifi_brdaddr;/* broadcast address */ - struct sockaddr *ifi_dstaddr;/* destination address */ - struct ifi_info *ifi_next; /* next of these structures */ -}; - -#if defined(AF_INET6) && HAVE_IPV6 && HAVE_LINUX -#define PROC_IFINET6_PATH "/proc/net/if_inet6" -extern struct ifi_info *get_ifi_info_linuxv6(int family, int doaliases); -#endif - -#if defined(AF_INET6) && HAVE_IPV6 -#define INET6_ADDRSTRLEN 46 /*Maximum length of IPv6 address */ -#endif - - - -#define IFI_ALIAS 1 /* ifi_addr is an alias */ - -/* From the text (Stevens, section 16.6): */ -/* 'Since many programs need to know all the interfaces on a system, we will develop a */ -/* function of our own named get_ifi_info that returns a linked list of structures, one */ -/* for each interface that is currently "up."' */ -extern struct ifi_info *get_ifi_info(int family, int doaliases); - -/* 'The free_ifi_info function, which takes a pointer that was */ -/* returned by get_ifi_info and frees all the dynamic memory.' */ -extern void free_ifi_info(struct ifi_info *); - -#ifdef NOT_HAVE_DAEMON -extern int daemon(int nochdir, int noclose); -#endif - -#ifdef __cplusplus - } -#endif - -#endif diff --git a/src/tools/mdnssd/mdnssd.pro b/src/tools/mdnssd/mdnssd.pro deleted file mode 100644 index 2272a5bf61..0000000000 --- a/src/tools/mdnssd/mdnssd.pro +++ /dev/null @@ -1,59 +0,0 @@ -#------------------------------------------------- -# -# Project created by QtCreator 2011-10-14T10:22:27 -# -#------------------------------------------------- - -QT -= gui -QT += core - -TARGET = mdnssd -CONFIG += console -CONFIG -= app_bundle - -TEMPLATE = app - -include(../../../qtcreator.pri) -DESTDIR = $$IDE_BIN_PATH - -DEFINES += PID_FILE=\\\"/var/run/mdnsd.pid\\\" MDNS_UDS_SERVERPATH=\\\"/var/run/mdnsd\\\" MDNS_DEBUGMSGS=0 - -SOURCES += \ - uds_daemon.c \ - uDNS.c \ - PosixDaemon.c \ - PlatformCommon.c \ - mDNSUNP.c \ - mDNSPosix.c \ - mDNSDebug.c \ - mDNS.c \ - GenLinkedList.c \ - dnssd_ipc.c \ - DNSDigest.c \ - DNSCommon.c - -HEADERS += \ - uds_daemon.h \ - uDNS.h \ - PlatformCommon.h \ - mDNSUNP.h \ - mDNSPosix.h \ - mDNSEmbeddedAPI.h \ - mDNSDebug.h \ - GenLinkedList.h \ - dnssd_ipc.h \ - DNSCommon.h \ - DebugServices.h \ - dns_sd.h - -*-g++ { - QMAKE_CFLAGS += -Wno-unused-but-set-variable - QMAKE_CXXFLAGS += -Wno-unused-but-set-variable -} -linux-* { -DEFINES += _GNU_SOURCE HAVE_IPV6 NOT_HAVE_SA_LEN USES_NETLINK HAVE_LINUX TARGET_OS_LINUX -} -macx { -DEFINES += HAVE_IPV6 __MAC_OS_X_VERSION_MIN_REQUIRED=__MAC_OS_X_VERSION_10_4 __APPLE_USE_RFC_2292 -} - diff --git a/src/tools/mdnssd/uDNS.c b/src/tools/mdnssd/uDNS.c deleted file mode 100755 index 57cfc1a689..0000000000 --- a/src/tools/mdnssd/uDNS.c +++ /dev/null @@ -1,4927 +0,0 @@ -/* -*- Mode: C; tab-width: 4 -*- - * - * Copyright (c) 2002-2006 Apple Computer, Inc. All rights reserved. - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - - * To Do: - * Elimate all mDNSPlatformMemAllocate/mDNSPlatformMemFree from this code -- the core code - * is supposed to be malloc-free so that it runs in constant memory determined at compile-time. - * Any dynamic run-time requirements should be handled by the platform layer below or client layer above - */ - -#if APPLE_OSX_mDNSResponder -#include -#endif -#include "uDNS.h" - -#if(defined(_MSC_VER)) - // Disable "assignment within conditional expression". - // Other compilers understand the convention that if you place the assignment expression within an extra pair - // of parentheses, this signals to the compiler that you really intended an assignment and no warning is necessary. - // The Microsoft compiler doesn't understand this convention, so in the absense of any other way to signal - // to the compiler that the assignment is intentional, we have to just turn this warning off completely. - #pragma warning(disable:4706) -#endif - -// For domain enumeration and automatic browsing -// This is the user's DNS search list. -// In each of these domains we search for our special pointer records (lb._dns-sd._udp., etc.) -// to discover recommended domains for domain enumeration (browse, default browse, registration, -// default registration) and possibly one or more recommended automatic browsing domains. -mDNSexport SearchListElem *SearchList = mDNSNULL; - -// The value can be set to true by the Platform code e.g., MacOSX uses the plist mechanism -mDNSBool StrictUnicastOrdering = mDNSfalse; - -// We keep track of the number of unicast DNS servers and log a message when we exceed 64. -// Currently the unicast queries maintain a 64 bit map to track the valid DNS servers for that -// question. Bit position is the index into the DNS server list. This is done so to try all -// the servers exactly once before giving up. If we could allocate memory in the core, then -// arbitrary limitation of 64 DNSServers can be removed. -mDNSu8 NumUnicastDNSServers = 0; -#define MAX_UNICAST_DNS_SERVERS 64 - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - General Utility Functions -#endif - -// set retry timestamp for record with exponential backoff -mDNSlocal void SetRecordRetry(mDNS *const m, AuthRecord *rr, mDNSu32 random) - { - rr->LastAPTime = m->timenow; - - if (rr->expire && rr->refreshCount < MAX_UPDATE_REFRESH_COUNT) - { - mDNSs32 remaining = rr->expire - m->timenow; - rr->refreshCount++; - if (remaining > MIN_UPDATE_REFRESH_TIME) - { - // Refresh at 70% + random (currently it is 0 to 10%) - rr->ThisAPInterval = 7 * (remaining/10) + (random ? random : mDNSRandom(remaining/10)); - // Don't update more often than 5 minutes - if (rr->ThisAPInterval < MIN_UPDATE_REFRESH_TIME) - rr->ThisAPInterval = MIN_UPDATE_REFRESH_TIME; - LogInfo("SetRecordRetry refresh in %d of %d for %s", - rr->ThisAPInterval/mDNSPlatformOneSecond, (rr->expire - m->timenow)/mDNSPlatformOneSecond, ARDisplayString(m, rr)); - } - else - { - rr->ThisAPInterval = MIN_UPDATE_REFRESH_TIME; - LogInfo("SetRecordRetry clamping to min refresh in %d of %d for %s", - rr->ThisAPInterval/mDNSPlatformOneSecond, (rr->expire - m->timenow)/mDNSPlatformOneSecond, ARDisplayString(m, rr)); - } - return; - } - - rr->expire = 0; - - rr->ThisAPInterval = rr->ThisAPInterval * QuestionIntervalStep; // Same Retry logic as Unicast Queries - if (rr->ThisAPInterval < INIT_RECORD_REG_INTERVAL) - rr->ThisAPInterval = INIT_RECORD_REG_INTERVAL; - if (rr->ThisAPInterval > MAX_RECORD_REG_INTERVAL) - rr->ThisAPInterval = MAX_RECORD_REG_INTERVAL; - - LogInfo("SetRecordRetry retry in %d ms for %s", rr->ThisAPInterval, ARDisplayString(m, rr)); - } - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - Name Server List Management -#endif - -mDNSexport DNSServer *mDNS_AddDNSServer(mDNS *const m, const domainname *d, const mDNSInterfaceID interface, const mDNSAddr *addr, const mDNSIPPort port, mDNSBool scoped, mDNSu32 timeout, mDNSBool cellIntf) - { - DNSServer **p = &m->DNSServers; - DNSServer *tmp = mDNSNULL; - - if ((NumUnicastDNSServers + 1) > MAX_UNICAST_DNS_SERVERS) - { - LogMsg("mDNS_AddDNSServer: DNS server limit of %d reached, not adding this server", MAX_UNICAST_DNS_SERVERS); - return mDNSNULL; - } - - if (!d) d = (const domainname *)""; - - LogInfo("mDNS_AddDNSServer: Adding %#a for %##s, InterfaceID %p, scoped %d", addr, d->c, interface, scoped); - if (m->mDNS_busy != m->mDNS_reentrancy+1) - LogMsg("mDNS_AddDNSServer: Lock not held! mDNS_busy (%ld) mDNS_reentrancy (%ld)", m->mDNS_busy, m->mDNS_reentrancy); - - while (*p) // Check if we already have this {interface,address,port,domain} tuple registered - { - if ((*p)->scoped == scoped && (*p)->interface == interface && (*p)->teststate != DNSServer_Disabled && - mDNSSameAddress(&(*p)->addr, addr) && mDNSSameIPPort((*p)->port, port) && SameDomainName(&(*p)->domain, d)) - { - if (!((*p)->flags & DNSServer_FlagDelete)) debugf("Note: DNS Server %#a:%d for domain %##s (%p) registered more than once", addr, mDNSVal16(port), d->c, interface); - (*p)->flags &= ~DNSServer_FlagDelete; - tmp = *p; - *p = tmp->next; - tmp->next = mDNSNULL; - } - else - p=&(*p)->next; - } - - if (tmp) *p = tmp; // move to end of list, to ensure ordering from platform layer - else - { - // allocate, add to list - *p = mDNSPlatformMemAllocate(sizeof(**p)); - if (!*p) LogMsg("Error: mDNS_AddDNSServer - malloc"); - else - { - NumUnicastDNSServers++; - (*p)->scoped = scoped; - (*p)->interface = interface; - (*p)->addr = *addr; - (*p)->port = port; - (*p)->flags = DNSServer_FlagNew; - (*p)->teststate = /* DNSServer_Untested */ DNSServer_Passed; - (*p)->lasttest = m->timenow - INIT_UCAST_POLL_INTERVAL; - (*p)->timeout = timeout; - (*p)->cellIntf = cellIntf; - AssignDomainName(&(*p)->domain, d); - (*p)->next = mDNSNULL; - } - } - (*p)->penaltyTime = 0; - return(*p); - } - -// PenalizeDNSServer is called when the number of queries to the unicast -// DNS server exceeds MAX_UCAST_UNANSWERED_QUERIES or when we receive an -// error e.g., SERV_FAIL from DNS server. -mDNSexport void PenalizeDNSServer(mDNS *const m, DNSQuestion *q) - { - DNSServer *new; - DNSServer *orig = q->qDNSServer; - - if (m->mDNS_busy != m->mDNS_reentrancy+1) - LogMsg("PenalizeDNSServer: Lock not held! mDNS_busy (%ld) mDNS_reentrancy (%ld)", m->mDNS_busy, m->mDNS_reentrancy); - - // This should never happen. Whenever we change DNS server, we change the ID on the question and hence - // we should never accept a response after we penalize a DNS server e.g., send two queries, no response, - // penalize DNS server and no new servers to pick for the question and hence qDNSServer is NULL. If we - // receive a response now, the DNS server can be NULL. But we won't because the ID already has been - // changed. - if (!q->qDNSServer) - { - LogMsg("PenalizeDNSServer: ERROR!! Null DNS server for %##s (%s) %d", q->qname.c, DNSTypeName(q->qtype), q->unansweredQueries); - goto end; - } - - LogInfo("PenalizeDNSServer: Penalizing DNS server %#a:%d question (%##s) for question %p %##s (%s) SuppressUnusable %d", - &q->qDNSServer->addr, mDNSVal16(q->qDNSServer->port), q->qDNSServer->domain.c, q, q->qname.c, DNSTypeName(q->qtype), - q->SuppressUnusable); - - // If strict ordering of unicast servers needs to be preserved, we just lookup - // the next best match server below - // - // If strict ordering is not required which is the default behavior, we penalize the server - // for DNSSERVER_PENALTY_TIME. We may also use additional logic e.g., don't penalize for PTR - // in the future. - - if (!StrictUnicastOrdering) - { - LogInfo("PenalizeDNSServer: Strict Unicast Ordering is FALSE"); - // We penalize the server so that new queries don't pick this server for DNSSERVER_PENALTY_TIME - // XXX Include other logic here to see if this server should really be penalized - // - if (q->qtype == kDNSType_PTR) - { - LogInfo("PenalizeDNSServer: Not Penalizing PTR question"); - } - else - { - LogInfo("PenalizeDNSServer: Penalizing question type %d", q->qtype); - q->qDNSServer->penaltyTime = NonZeroTime(m->timenow + DNSSERVER_PENALTY_TIME); - } - } - else - { - LogInfo("PenalizeDNSServer: Strict Unicast Ordering is TRUE"); - } - -end: - new = GetServerForQuestion(m, q); - - - if (new == orig) - { - if (new) - LogMsg("PenalizeDNSServer: ERROR!! GetServerForQuestion returned the same server %#a:%d", &new->addr, - mDNSVal16(new->port)); - else - LogMsg("PenalizeDNSServer: ERROR!! GetServerForQuestion returned the same server NULL"); - q->ThisQInterval = 0; // Inactivate this question so that we dont bombard the network - } - else - { - // The new DNSServer is set in DNSServerChangeForQuestion - DNSServerChangeForQuestion(m, q, new); - - if (new) - { - LogInfo("PenalizeDNSServer: Server for %##s (%s) changed to %#a:%d (%##s)", - q->qname.c, DNSTypeName(q->qtype), &q->qDNSServer->addr, mDNSVal16(q->qDNSServer->port), q->qDNSServer->domain.c); - // We want to try the next server immediately. As the question may already have backed off, reset - // the interval. We do this only the first time when we try all the DNS servers. Once we reached the end of - // list and retrying all the servers again e.g., at least one server failed to respond in the previous try, we - // use the normal backoff which is done in uDNS_CheckCurrentQuestion when we send the packet out. - if (!q->triedAllServersOnce) - { - q->ThisQInterval = InitialQuestionInterval; - q->LastQTime = m->timenow - q->ThisQInterval; - SetNextQueryTime(m, q); - } - } - else - { - // We don't have any more DNS servers for this question. If some server in the list did not return - // any response, we need to keep retrying till we get a response. uDNS_CheckCurrentQuestion handles - // this case. - // - // If all servers responded with a negative response, We need to do two things. First, generate a - // negative response so that applications get a reply. We also need to reinitialize the DNS servers - // so that when the cache expires, we can restart the query. - // - // Negative response may be generated in two ways. - // - // 1. AnswerQuestionForDNSServerChanges (called from DNSServerChangedForQuestion) might find some - // cache entries and answer this question. - // 2. uDNS_CheckCurrentQuestion will create a new cache entry and answer this question - // - // For (1), it might be okay to reinitialize the DNS servers here. But for (2), we can't do it here - // because uDNS_CheckCurrentQuestion will try resending the queries. Hence, to be consistent, we - // defer reintializing the DNS servers up until generating a negative cache response. - // - // Be careful not to touch the ThisQInterval here. For a normal question, when we answer the question - // in AnswerCurrentQuestionWithResourceRecord will set ThisQInterval to MaxQuestionInterval and hence - // the next query will not happen until cache expiry. If it is a long lived question, - // AnswerCurrentQuestionWithResourceRecord will not set it to MaxQuestionInterval. In that case, - // we want the normal backoff to work. - LogInfo("PenalizeDNSServer: Server for %p, %##s (%s) changed to NULL, Interval %d", q, q->qname.c, DNSTypeName(q->qtype), q->ThisQInterval); - } - q->unansweredQueries = 0; - - } - } - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - authorization management -#endif - -mDNSlocal DomainAuthInfo *GetAuthInfoForName_direct(mDNS *m, const domainname *const name) - { - const domainname *n = name; - while (n->c[0]) - { - DomainAuthInfo *ptr; - for (ptr = m->AuthInfoList; ptr; ptr = ptr->next) - if (SameDomainName(&ptr->domain, n)) - { - debugf("GetAuthInfoForName %##s Matched %##s Key name %##s", name->c, ptr->domain.c, ptr->keyname.c); - return(ptr); - } - n = (const domainname *)(n->c + 1 + n->c[0]); - } - //LogInfo("GetAuthInfoForName none found for %##s", name->c); - return mDNSNULL; - } - -// MUST be called with lock held -mDNSexport DomainAuthInfo *GetAuthInfoForName_internal(mDNS *m, const domainname *const name) - { - DomainAuthInfo **p = &m->AuthInfoList; - - if (m->mDNS_busy != m->mDNS_reentrancy+1) - LogMsg("GetAuthInfoForName_internal: Lock not held! mDNS_busy (%ld) mDNS_reentrancy (%ld)", m->mDNS_busy, m->mDNS_reentrancy); - - // First purge any dead keys from the list - while (*p) - { - if ((*p)->deltime && m->timenow - (*p)->deltime >= 0 && AutoTunnelUnregistered(*p)) - { - DNSQuestion *q; - DomainAuthInfo *info = *p; - LogInfo("GetAuthInfoForName_internal deleting expired key %##s %##s", info->domain.c, info->keyname.c); - *p = info->next; // Cut DomainAuthInfo from list *before* scanning our question list updating AuthInfo pointers - for (q = m->Questions; q; q=q->next) - if (q->AuthInfo == info) - { - q->AuthInfo = GetAuthInfoForName_direct(m, &q->qname); - debugf("GetAuthInfoForName_internal updated q->AuthInfo from %##s to %##s for %##s (%s)", - info->domain.c, q->AuthInfo ? q->AuthInfo->domain.c : mDNSNULL, q->qname.c, DNSTypeName(q->qtype)); - } - - // Probably not essential, but just to be safe, zero out the secret key data - // so we don't leave it hanging around in memory - // (where it could potentially get exposed via some other bug) - mDNSPlatformMemZero(info, sizeof(*info)); - mDNSPlatformMemFree(info); - } - else - p = &(*p)->next; - } - - return(GetAuthInfoForName_direct(m, name)); - } - -mDNSexport DomainAuthInfo *GetAuthInfoForName(mDNS *m, const domainname *const name) - { - DomainAuthInfo *d; - mDNS_Lock(m); - d = GetAuthInfoForName_internal(m, name); - mDNS_Unlock(m); - return(d); - } - -// MUST be called with the lock held -mDNSexport mStatus mDNS_SetSecretForDomain(mDNS *m, DomainAuthInfo *info, - const domainname *domain, const domainname *keyname, const char *b64keydata, const domainname *hostname, mDNSIPPort *port, const char *autoTunnelPrefix) - { - DNSQuestion *q; - DomainAuthInfo **p = &m->AuthInfoList; - if (!info || !b64keydata) { LogMsg("mDNS_SetSecretForDomain: ERROR: info %p b64keydata %p", info, b64keydata); return(mStatus_BadParamErr); } - - LogInfo("mDNS_SetSecretForDomain: domain %##s key %##s%s%s", domain->c, keyname->c, autoTunnelPrefix ? " prefix " : "", autoTunnelPrefix ? autoTunnelPrefix : ""); - - info->AutoTunnel = autoTunnelPrefix; - AssignDomainName(&info->domain, domain); - AssignDomainName(&info->keyname, keyname); - if (hostname) - AssignDomainName(&info->hostname, hostname); - else - info->hostname.c[0] = 0; - if (port) - info->port = *port; - else - info->port = zeroIPPort; - mDNS_snprintf(info->b64keydata, sizeof(info->b64keydata), "%s", b64keydata); - - if (DNSDigest_ConstructHMACKeyfromBase64(info, b64keydata) < 0) - { - LogMsg("mDNS_SetSecretForDomain: ERROR: Could not convert shared secret from base64: domain %##s key %##s %s", domain->c, keyname->c, mDNS_LoggingEnabled ? b64keydata : ""); - return(mStatus_BadParamErr); - } - - // Don't clear deltime until after we've ascertained that b64keydata is valid - info->deltime = 0; - - while (*p && (*p) != info) p=&(*p)->next; - if (*p) {LogInfo("mDNS_SetSecretForDomain: Domain %##s Already in list", (*p)->domain.c); return(mStatus_AlreadyRegistered);} - - // Caution: Only zero AutoTunnelHostRecord.namestorage and AutoTunnelNAT.clientContext AFTER we've determined that this is a NEW DomainAuthInfo - // being added to the list. Otherwise we risk smashing our AutoTunnel host records and NATOperation that are already active and in use. - info->AutoTunnelHostRecord.resrec.RecordType = kDNSRecordTypeUnregistered; - info->AutoTunnelHostRecord.namestorage.c[0] = 0; - info->AutoTunnelTarget .resrec.RecordType = kDNSRecordTypeUnregistered; - info->AutoTunnelDeviceInfo.resrec.RecordType = kDNSRecordTypeUnregistered; - info->AutoTunnelService .resrec.RecordType = kDNSRecordTypeUnregistered; - info->AutoTunnel6Record .resrec.RecordType = kDNSRecordTypeUnregistered; - info->AutoTunnelNAT.clientContext = mDNSNULL; - info->next = mDNSNULL; - *p = info; - - // Check to see if adding this new DomainAuthInfo has changed the credentials for any of our questions - for (q = m->Questions; q; q=q->next) - { - DomainAuthInfo *newinfo = GetAuthInfoForQuestion(m, q); - if (q->AuthInfo != newinfo) - { - debugf("mDNS_SetSecretForDomain updating q->AuthInfo from %##s to %##s for %##s (%s)", - q->AuthInfo ? q->AuthInfo->domain.c : mDNSNULL, - newinfo ? newinfo ->domain.c : mDNSNULL, q->qname.c, DNSTypeName(q->qtype)); - q->AuthInfo = newinfo; - } - } - - return(mStatus_NoError); - } - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - NAT Traversal -#endif - -mDNSlocal mStatus uDNS_SendNATMsg(mDNS *m, NATTraversalInfo *info) - { - mStatus err = mStatus_NoError; - - // send msg if we have a router and it is a private address - if (!mDNSIPv4AddressIsZero(m->Router.ip.v4) && mDNSv4AddrIsRFC1918(&m->Router.ip.v4)) - { - union { NATAddrRequest NATAddrReq; NATPortMapRequest NATPortReq; } u = { { NATMAP_VERS, NATOp_AddrRequest } } ; - const mDNSu8 *end = (mDNSu8 *)&u + sizeof(NATAddrRequest); - - if (info) // For NATOp_MapUDP and NATOp_MapTCP, fill in additional fields - { - mDNSu8 *p = (mDNSu8 *)&u.NATPortReq.NATReq_lease; - u.NATPortReq.opcode = info->Protocol; - u.NATPortReq.unused = zeroID; - u.NATPortReq.intport = info->IntPort; - u.NATPortReq.extport = info->RequestedPort; - p[0] = (mDNSu8)((info->NATLease >> 24) & 0xFF); - p[1] = (mDNSu8)((info->NATLease >> 16) & 0xFF); - p[2] = (mDNSu8)((info->NATLease >> 8) & 0xFF); - p[3] = (mDNSu8)( info->NATLease & 0xFF); - end = (mDNSu8 *)&u + sizeof(NATPortMapRequest); - } - - err = mDNSPlatformSendUDP(m, (mDNSu8 *)&u, end, 0, mDNSNULL, &m->Router, NATPMPPort); - -#ifdef _LEGACY_NAT_TRAVERSAL_ - if (mDNSIPPortIsZero(m->UPnPRouterPort) || mDNSIPPortIsZero(m->UPnPSOAPPort)) LNT_SendDiscoveryMsg(m); - else if (info) err = LNT_MapPort(m, info); - else err = LNT_GetExternalAddress(m); -#endif // _LEGACY_NAT_TRAVERSAL_ - } - return(err); - } - -mDNSexport void RecreateNATMappings(mDNS *const m) - { - NATTraversalInfo *n; - for (n = m->NATTraversals; n; n=n->next) - { - n->ExpiryTime = 0; // Mark this mapping as expired - n->retryInterval = NATMAP_INIT_RETRY; - n->retryPortMap = m->timenow; -#ifdef _LEGACY_NAT_TRAVERSAL_ - if (n->tcpInfo.sock) { mDNSPlatformTCPCloseConnection(n->tcpInfo.sock); n->tcpInfo.sock = mDNSNULL; } -#endif // _LEGACY_NAT_TRAVERSAL_ - } - - m->NextScheduledNATOp = m->timenow; // Need to send packets immediately - } - -mDNSexport void natTraversalHandleAddressReply(mDNS *const m, mDNSu16 err, mDNSv4Addr ExtAddr) - { - static mDNSu16 last_err = 0; - - if (err) - { - if (err != last_err) LogMsg("Error getting external address %d", err); - ExtAddr = zerov4Addr; - } - else - { - LogInfo("Received external IP address %.4a from NAT", &ExtAddr); - if (mDNSv4AddrIsRFC1918(&ExtAddr)) - LogMsg("Double NAT (external NAT gateway address %.4a is also a private RFC 1918 address)", &ExtAddr); - if (mDNSIPv4AddressIsZero(ExtAddr)) - err = NATErr_NetFail; // fake error to handle routers that pathologically report success with the zero address - } - - if (!mDNSSameIPv4Address(m->ExternalAddress, ExtAddr)) - { - m->ExternalAddress = ExtAddr; - RecreateNATMappings(m); // Also sets NextScheduledNATOp for us - } - - if (!err) // Success, back-off to maximum interval - m->retryIntervalGetAddr = NATMAP_MAX_RETRY_INTERVAL; - else if (!last_err) // Failure after success, retry quickly (then back-off exponentially) - m->retryIntervalGetAddr = NATMAP_INIT_RETRY; - // else back-off normally in case of pathological failures - - m->retryGetAddr = m->timenow + m->retryIntervalGetAddr; - if (m->NextScheduledNATOp - m->retryIntervalGetAddr > 0) - m->NextScheduledNATOp = m->retryIntervalGetAddr; - - last_err = err; - } - -// Both places that call NATSetNextRenewalTime() update m->NextScheduledNATOp correctly afterwards -mDNSlocal void NATSetNextRenewalTime(mDNS *const m, NATTraversalInfo *n) - { - n->retryInterval = (n->ExpiryTime - m->timenow)/2; - if (n->retryInterval < NATMAP_MIN_RETRY_INTERVAL) // Min retry interval is 2 seconds - n->retryInterval = NATMAP_MIN_RETRY_INTERVAL; - n->retryPortMap = m->timenow + n->retryInterval; - } - -// Note: When called from handleLNTPortMappingResponse() only pkt->err, pkt->extport and pkt->NATRep_lease fields are filled in -mDNSexport void natTraversalHandlePortMapReply(mDNS *const m, NATTraversalInfo *n, const mDNSInterfaceID InterfaceID, mDNSu16 err, mDNSIPPort extport, mDNSu32 lease) - { - const char *prot = n->Protocol == NATOp_MapUDP ? "UDP" : n->Protocol == NATOp_MapTCP ? "TCP" : "?"; - (void)prot; - n->NewResult = err; - if (err || lease == 0 || mDNSIPPortIsZero(extport)) - { - LogInfo("natTraversalHandlePortMapReply: %p Response %s Port %5d External Port %5d lease %d error %d", - n, prot, mDNSVal16(n->IntPort), mDNSVal16(extport), lease, err); - n->retryInterval = NATMAP_MAX_RETRY_INTERVAL; - n->retryPortMap = m->timenow + NATMAP_MAX_RETRY_INTERVAL; - // No need to set m->NextScheduledNATOp here, since we're only ever extending the m->retryPortMap time - if (err == NATErr_Refused) n->NewResult = mStatus_NATPortMappingDisabled; - else if (err > NATErr_None && err <= NATErr_Opcode) n->NewResult = mStatus_NATPortMappingUnsupported; - } - else - { - if (lease > 999999999UL / mDNSPlatformOneSecond) - lease = 999999999UL / mDNSPlatformOneSecond; - n->ExpiryTime = NonZeroTime(m->timenow + lease * mDNSPlatformOneSecond); - - if (!mDNSSameIPPort(n->RequestedPort, extport)) - LogInfo("natTraversalHandlePortMapReply: %p Response %s Port %5d External Port %5d changed to %5d", - n, prot, mDNSVal16(n->IntPort), mDNSVal16(n->RequestedPort), mDNSVal16(extport)); - - n->InterfaceID = InterfaceID; - n->RequestedPort = extport; - - LogInfo("natTraversalHandlePortMapReply: %p Response %s Port %5d External Port %5d lease %d", - n, prot, mDNSVal16(n->IntPort), mDNSVal16(extport), lease); - - NATSetNextRenewalTime(m, n); // Got our port mapping; now set timer to renew it at halfway point - m->NextScheduledNATOp = m->timenow; // May need to invoke client callback immediately - } - } - -// Must be called with the mDNS_Lock held -mDNSexport mStatus mDNS_StartNATOperation_internal(mDNS *const m, NATTraversalInfo *traversal) - { - NATTraversalInfo **n; - - LogInfo("mDNS_StartNATOperation_internal %p Protocol %d IntPort %d RequestedPort %d NATLease %d", traversal, - traversal->Protocol, mDNSVal16(traversal->IntPort), mDNSVal16(traversal->RequestedPort), traversal->NATLease); - - // Note: It important that new traversal requests are appended at the *end* of the list, not prepended at the start - for (n = &m->NATTraversals; *n; n=&(*n)->next) - { - if (traversal == *n) - { - LogMsg("Error! Tried to add a NAT traversal that's already in the active list: request %p Prot %d Int %d TTL %d", - traversal, traversal->Protocol, mDNSVal16(traversal->IntPort), traversal->NATLease); - #if ForceAlerts - *(long*)0 = 0; - #endif - return(mStatus_AlreadyRegistered); - } - if (traversal->Protocol && traversal->Protocol == (*n)->Protocol && mDNSSameIPPort(traversal->IntPort, (*n)->IntPort) && - !mDNSSameIPPort(traversal->IntPort, SSHPort)) - LogMsg("Warning: Created port mapping request %p Prot %d Int %d TTL %d " - "duplicates existing port mapping request %p Prot %d Int %d TTL %d", - traversal, traversal->Protocol, mDNSVal16(traversal->IntPort), traversal->NATLease, - *n, (*n) ->Protocol, mDNSVal16((*n) ->IntPort), (*n) ->NATLease); - } - - // Initialize necessary fields - traversal->next = mDNSNULL; - traversal->ExpiryTime = 0; - traversal->retryInterval = NATMAP_INIT_RETRY; - traversal->retryPortMap = m->timenow; - traversal->NewResult = mStatus_NoError; - traversal->ExternalAddress = onesIPv4Addr; - traversal->ExternalPort = zeroIPPort; - traversal->Lifetime = 0; - traversal->Result = mStatus_NoError; - - // set default lease if necessary - if (!traversal->NATLease) traversal->NATLease = NATMAP_DEFAULT_LEASE; - -#ifdef _LEGACY_NAT_TRAVERSAL_ - mDNSPlatformMemZero(&traversal->tcpInfo, sizeof(traversal->tcpInfo)); -#endif // _LEGACY_NAT_TRAVERSAL_ - - if (!m->NATTraversals) // If this is our first NAT request, kick off an address request too - { - m->retryGetAddr = m->timenow; - m->retryIntervalGetAddr = NATMAP_INIT_RETRY; - } - - m->NextScheduledNATOp = m->timenow; // This will always trigger sending the packet ASAP, and generate client callback if necessary - - *n = traversal; // Append new NATTraversalInfo to the end of our list - - return(mStatus_NoError); - } - -// Must be called with the mDNS_Lock held -mDNSexport mStatus mDNS_StopNATOperation_internal(mDNS *m, NATTraversalInfo *traversal) - { - mDNSBool unmap = mDNStrue; - NATTraversalInfo *p; - NATTraversalInfo **ptr = &m->NATTraversals; - - while (*ptr && *ptr != traversal) ptr=&(*ptr)->next; - if (*ptr) *ptr = (*ptr)->next; // If we found it, cut this NATTraversalInfo struct from our list - else - { - LogMsg("mDNS_StopNATOperation_internal: NATTraversalInfo %p not found in list", traversal); - return(mStatus_BadReferenceErr); - } - - LogInfo("mDNS_StopNATOperation_internal %p %d %d %d %d", traversal, - traversal->Protocol, mDNSVal16(traversal->IntPort), mDNSVal16(traversal->RequestedPort), traversal->NATLease); - - if (m->CurrentNATTraversal == traversal) - m->CurrentNATTraversal = m->CurrentNATTraversal->next; - - if (traversal->Protocol) - for (p = m->NATTraversals; p; p=p->next) - if (traversal->Protocol == p->Protocol && mDNSSameIPPort(traversal->IntPort, p->IntPort)) - { - if (!mDNSSameIPPort(traversal->IntPort, SSHPort)) - LogMsg("Warning: Removed port mapping request %p Prot %d Int %d TTL %d " - "duplicates existing port mapping request %p Prot %d Int %d TTL %d", - traversal, traversal->Protocol, mDNSVal16(traversal->IntPort), traversal->NATLease, - p, p ->Protocol, mDNSVal16(p ->IntPort), p ->NATLease); - unmap = mDNSfalse; - } - - if (traversal->ExpiryTime && unmap) - { - traversal->NATLease = 0; - traversal->retryInterval = 0; - uDNS_SendNATMsg(m, traversal); - } - - // Even if we DIDN'T make a successful UPnP mapping yet, we might still have a partially-open TCP connection we need to clean up - #ifdef _LEGACY_NAT_TRAVERSAL_ - { - mStatus err = LNT_UnmapPort(m, traversal); - if (err) LogMsg("Legacy NAT Traversal - unmap request failed with error %d", err); - } - #endif // _LEGACY_NAT_TRAVERSAL_ - - return(mStatus_NoError); - } - -mDNSexport mStatus mDNS_StartNATOperation(mDNS *const m, NATTraversalInfo *traversal) - { - mStatus status; - mDNS_Lock(m); - status = mDNS_StartNATOperation_internal(m, traversal); - mDNS_Unlock(m); - return(status); - } - -mDNSexport mStatus mDNS_StopNATOperation(mDNS *const m, NATTraversalInfo *traversal) - { - mStatus status; - mDNS_Lock(m); - status = mDNS_StopNATOperation_internal(m, traversal); - mDNS_Unlock(m); - return(status); - } - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - Long-Lived Queries -#endif - -// Lock must be held -- otherwise m->timenow is undefined -mDNSlocal void StartLLQPolling(mDNS *const m, DNSQuestion *q) - { - debugf("StartLLQPolling: %##s", q->qname.c); - q->state = LLQ_Poll; - q->ThisQInterval = INIT_UCAST_POLL_INTERVAL; - // We want to send our poll query ASAP, but the "+ 1" is because if we set the time to now, - // we risk causing spurious "SendQueries didn't send all its queries" log messages - q->LastQTime = m->timenow - q->ThisQInterval + 1; - SetNextQueryTime(m, q); -#if APPLE_OSX_mDNSResponder - UpdateAutoTunnelDomainStatuses(m); -#endif - } - -mDNSlocal mDNSu8 *putLLQ(DNSMessage *const msg, mDNSu8 *ptr, const DNSQuestion *const question, const LLQOptData *const data) - { - AuthRecord rr; - ResourceRecord *opt = &rr.resrec; - rdataOPT *optRD; - - //!!!KRS when we implement multiple llqs per message, we'll need to memmove anything past the question section - ptr = putQuestion(msg, ptr, msg->data + AbsoluteMaxDNSMessageData, &question->qname, question->qtype, question->qclass); - if (!ptr) { LogMsg("ERROR: putLLQ - putQuestion"); return mDNSNULL; } - - // locate OptRR if it exists, set pointer to end - // !!!KRS implement me - - // format opt rr (fields not specified are zero-valued) - mDNS_SetupResourceRecord(&rr, mDNSNULL, mDNSInterface_Any, kDNSType_OPT, kStandardTTL, kDNSRecordTypeKnownUnique, AuthRecordAny, mDNSNULL, mDNSNULL); - opt->rrclass = NormalMaxDNSMessageData; - opt->rdlength = sizeof(rdataOPT); // One option in this OPT record - opt->rdestimate = sizeof(rdataOPT); - - optRD = &rr.resrec.rdata->u.opt[0]; - optRD->opt = kDNSOpt_LLQ; - optRD->u.llq = *data; - ptr = PutResourceRecordTTLJumbo(msg, ptr, &msg->h.numAdditionals, opt, 0); - if (!ptr) { LogMsg("ERROR: putLLQ - PutResourceRecordTTLJumbo"); return mDNSNULL; } - - return ptr; - } - -// Normally we'd just request event packets be sent directly to m->LLQNAT.ExternalPort, except... -// with LLQs over TLS/TCP we're doing a weird thing where instead of requesting packets be sent to ExternalAddress:ExternalPort -// we're requesting that packets be sent to ExternalPort, but at the source address of our outgoing TCP connection. -// Normally, after going through the NAT gateway, the source address of our outgoing TCP connection is the same as ExternalAddress, -// so this is fine, except when the TCP connection ends up going over a VPN tunnel instead. -// To work around this, if we find that the source address for our TCP connection is not a private address, we tell the Dot Mac -// LLQ server to send events to us directly at port 5353 on that address, instead of at our mapped external NAT port. - -mDNSlocal mDNSu16 GetLLQEventPort(const mDNS *const m, const mDNSAddr *const dst) - { - mDNSAddr src; - mDNSPlatformSourceAddrForDest(&src, dst); - //LogMsg("GetLLQEventPort: src %#a for dst %#a (%d)", &src, dst, mDNSv4AddrIsRFC1918(&src.ip.v4) ? mDNSVal16(m->LLQNAT.ExternalPort) : 0); - return(mDNSv4AddrIsRFC1918(&src.ip.v4) ? mDNSVal16(m->LLQNAT.ExternalPort) : mDNSVal16(MulticastDNSPort)); - } - -// Normally called with llq set. -// May be called with llq NULL, when retransmitting a lost Challenge Response -mDNSlocal void sendChallengeResponse(mDNS *const m, DNSQuestion *const q, const LLQOptData *llq) - { - mDNSu8 *responsePtr = m->omsg.data; - LLQOptData llqBuf; - - if (q->tcp) { LogMsg("sendChallengeResponse: ERROR!!: question %##s (%s) tcp non-NULL", q->qname.c, DNSTypeName(q->qtype)); return; } - - if (PrivateQuery(q)) { LogMsg("sendChallengeResponse: ERROR!!: Private Query %##s (%s)", q->qname.c, DNSTypeName(q->qtype)); return; } - - if (q->ntries++ == kLLQ_MAX_TRIES) - { - LogMsg("sendChallengeResponse: %d failed attempts for LLQ %##s", kLLQ_MAX_TRIES, q->qname.c); - StartLLQPolling(m,q); - return; - } - - if (!llq) // Retransmission: need to make a new LLQOptData - { - llqBuf.vers = kLLQ_Vers; - llqBuf.llqOp = kLLQOp_Setup; - llqBuf.err = LLQErr_NoError; // Don't need to tell server UDP notification port when sending over UDP - llqBuf.id = q->id; - llqBuf.llqlease = q->ReqLease; - llq = &llqBuf; - } - - q->LastQTime = m->timenow; - q->ThisQInterval = q->tcp ? 0 : (kLLQ_INIT_RESEND * q->ntries * mDNSPlatformOneSecond); // If using TCP, don't need to retransmit - SetNextQueryTime(m, q); - - // To simulate loss of challenge response packet, uncomment line below - //if (q->ntries == 1) return; - - InitializeDNSMessage(&m->omsg.h, q->TargetQID, uQueryFlags); - responsePtr = putLLQ(&m->omsg, responsePtr, q, llq); - if (responsePtr) - { - mStatus err = mDNSSendDNSMessage(m, &m->omsg, responsePtr, mDNSInterface_Any, q->LocalSocket, &q->servAddr, q->servPort, mDNSNULL, mDNSNULL); - if (err) { LogMsg("sendChallengeResponse: mDNSSendDNSMessage%s failed: %d", q->tcp ? " (TCP)" : "", err); } - } - else StartLLQPolling(m,q); - } - -mDNSlocal void SetLLQTimer(mDNS *const m, DNSQuestion *const q, const LLQOptData *const llq) - { - mDNSs32 lease = (mDNSs32)llq->llqlease * mDNSPlatformOneSecond; - q->ReqLease = llq->llqlease; - q->LastQTime = m->timenow; - q->expire = m->timenow + lease; - q->ThisQInterval = lease/2 + mDNSRandom(lease/10); - debugf("SetLLQTimer setting %##s (%s) to %d %d", q->qname.c, DNSTypeName(q->qtype), lease/mDNSPlatformOneSecond, q->ThisQInterval/mDNSPlatformOneSecond); - SetNextQueryTime(m, q); - } - -mDNSlocal void recvSetupResponse(mDNS *const m, mDNSu8 rcode, DNSQuestion *const q, const LLQOptData *const llq) - { - if (rcode && rcode != kDNSFlag1_RC_NXDomain) - { LogMsg("ERROR: recvSetupResponse %##s (%s) - rcode && rcode != kDNSFlag1_RC_NXDomain", q->qname.c, DNSTypeName(q->qtype)); return; } - - if (llq->llqOp != kLLQOp_Setup) - { LogMsg("ERROR: recvSetupResponse %##s (%s) - bad op %d", q->qname.c, DNSTypeName(q->qtype), llq->llqOp); return; } - - if (llq->vers != kLLQ_Vers) - { LogMsg("ERROR: recvSetupResponse %##s (%s) - bad vers %d", q->qname.c, DNSTypeName(q->qtype), llq->vers); return; } - - if (q->state == LLQ_InitialRequest) - { - //LogInfo("Got LLQ_InitialRequest"); - - if (llq->err) { LogMsg("recvSetupResponse - received llq->err %d from server", llq->err); StartLLQPolling(m,q); return; } - - if (q->ReqLease != llq->llqlease) - debugf("recvSetupResponse: requested lease %lu, granted lease %lu", q->ReqLease, llq->llqlease); - - // cache expiration in case we go to sleep before finishing setup - q->ReqLease = llq->llqlease; - q->expire = m->timenow + ((mDNSs32)llq->llqlease * mDNSPlatformOneSecond); - - // update state - q->state = LLQ_SecondaryRequest; - q->id = llq->id; - q->ntries = 0; // first attempt to send response - sendChallengeResponse(m, q, llq); - } - else if (q->state == LLQ_SecondaryRequest) - { - //LogInfo("Got LLQ_SecondaryRequest"); - - // Fix this immediately if not sooner. Copy the id from the LLQOptData into our DNSQuestion struct. This is only - // an issue for private LLQs, because we skip parts 2 and 3 of the handshake. This is related to a bigger - // problem of the current implementation of TCP LLQ setup: we're not handling state transitions correctly - // if the server sends back SERVFULL or STATIC. - if (PrivateQuery(q)) - { - LogInfo("Private LLQ_SecondaryRequest; copying id %08X%08X", llq->id.l[0], llq->id.l[1]); - q->id = llq->id; - } - - if (llq->err) { LogMsg("ERROR: recvSetupResponse %##s (%s) code %d from server", q->qname.c, DNSTypeName(q->qtype), llq->err); StartLLQPolling(m,q); return; } - if (!mDNSSameOpaque64(&q->id, &llq->id)) - { LogMsg("recvSetupResponse - ID changed. discarding"); return; } // this can happen rarely (on packet loss + reordering) - q->state = LLQ_Established; - q->ntries = 0; - SetLLQTimer(m, q, llq); -#if APPLE_OSX_mDNSResponder - UpdateAutoTunnelDomainStatuses(m); -#endif - } - } - -mDNSexport uDNS_LLQType uDNS_recvLLQResponse(mDNS *const m, const DNSMessage *const msg, const mDNSu8 *const end, - const mDNSAddr *const srcaddr, const mDNSIPPort srcport, DNSQuestion **matchQuestion) - { - DNSQuestion pktQ, *q; - if (msg->h.numQuestions && getQuestion(msg, msg->data, end, 0, &pktQ)) - { - const rdataOPT *opt = GetLLQOptData(m, msg, end); - - for (q = m->Questions; q; q = q->next) - { - if (!mDNSOpaque16IsZero(q->TargetQID) && q->LongLived && q->qtype == pktQ.qtype && q->qnamehash == pktQ.qnamehash && SameDomainName(&q->qname, &pktQ.qname)) - { - debugf("uDNS_recvLLQResponse found %##s (%s) %d %#a %#a %X %X %X %X %d", - q->qname.c, DNSTypeName(q->qtype), q->state, srcaddr, &q->servAddr, - opt ? opt->u.llq.id.l[0] : 0, opt ? opt->u.llq.id.l[1] : 0, q->id.l[0], q->id.l[1], opt ? opt->u.llq.llqOp : 0); - if (q->state == LLQ_Poll) debugf("uDNS_LLQ_Events: q->state == LLQ_Poll msg->h.id %d q->TargetQID %d", mDNSVal16(msg->h.id), mDNSVal16(q->TargetQID)); - if (q->state == LLQ_Poll && mDNSSameOpaque16(msg->h.id, q->TargetQID)) - { - m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it - - // Don't reset the state to IntialRequest as we may write that to the dynamic store - // and PrefPane might wrongly think that we are "Starting" instead of "Polling". If - // we are in polling state because of NAT-PMP disabled or DoubleNAT, next LLQNATCallback - // would kick us back to LLQInitialRequest. So, resetting the state here may not be useful. - // - // If we have a good NAT (neither NAT-PMP disabled nor Double-NAT), then we should not be - // possibly in polling state. To be safe, we want to retry from the start in that case - // as there may not be another LLQNATCallback - // - // NOTE: We can be in polling state if we cannot resolve the SOA record i.e, servAddr is set to - // all ones. In that case, we would set it in LLQ_InitialRequest as it overrides the NAT-PMP or - // Double-NAT state. - if (!mDNSAddressIsOnes(&q->servAddr) && !mDNSIPPortIsZero(m->LLQNAT.ExternalPort) && - !m->LLQNAT.Result) - { - debugf("uDNS_recvLLQResponse got poll response; moving to LLQ_InitialRequest for %##s (%s)", q->qname.c, DNSTypeName(q->qtype)); - q->state = LLQ_InitialRequest; - } - q->servPort = zeroIPPort; // Clear servPort so that startLLQHandshake will retry the GetZoneData processing - q->ThisQInterval = LLQ_POLL_INTERVAL + mDNSRandom(LLQ_POLL_INTERVAL/10); // Retry LLQ setup in approx 15 minutes - q->LastQTime = m->timenow; - SetNextQueryTime(m, q); - *matchQuestion = q; - return uDNS_LLQ_Entire; // uDNS_LLQ_Entire means flush stale records; assume a large effective TTL - } - // Note: In LLQ Event packets, the msg->h.id does not match our q->TargetQID, because in that case the msg->h.id nonce is selected by the server - else if (opt && q->state == LLQ_Established && opt->u.llq.llqOp == kLLQOp_Event && mDNSSameOpaque64(&opt->u.llq.id, &q->id)) - { - mDNSu8 *ackEnd; - //debugf("Sending LLQ ack for %##s (%s)", q->qname.c, DNSTypeName(q->qtype)); - InitializeDNSMessage(&m->omsg.h, msg->h.id, ResponseFlags); - ackEnd = putLLQ(&m->omsg, m->omsg.data, q, &opt->u.llq); - if (ackEnd) mDNSSendDNSMessage(m, &m->omsg, ackEnd, mDNSInterface_Any, q->LocalSocket, srcaddr, srcport, mDNSNULL, mDNSNULL); - m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it - debugf("uDNS_LLQ_Events: q->state == LLQ_Established msg->h.id %d q->TargetQID %d", mDNSVal16(msg->h.id), mDNSVal16(q->TargetQID)); - *matchQuestion = q; - return uDNS_LLQ_Events; - } - if (opt && mDNSSameOpaque16(msg->h.id, q->TargetQID)) - { - if (q->state == LLQ_Established && opt->u.llq.llqOp == kLLQOp_Refresh && mDNSSameOpaque64(&opt->u.llq.id, &q->id) && msg->h.numAdditionals && !msg->h.numAnswers) - { - if (opt->u.llq.err != LLQErr_NoError) LogMsg("recvRefreshReply: received error %d from server", opt->u.llq.err); - else - { - //LogInfo("Received refresh confirmation ntries %d for %##s (%s)", q->ntries, q->qname.c, DNSTypeName(q->qtype)); - // If we're waiting to go to sleep, then this LLQ deletion may have been the thing - // we were waiting for, so schedule another check to see if we can sleep now. - if (opt->u.llq.llqlease == 0 && m->SleepLimit) m->NextScheduledSPRetry = m->timenow; - GrantCacheExtensions(m, q, opt->u.llq.llqlease); - SetLLQTimer(m, q, &opt->u.llq); - q->ntries = 0; - } - m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it - *matchQuestion = q; - return uDNS_LLQ_Ignore; - } - if (q->state < LLQ_Established && mDNSSameAddress(srcaddr, &q->servAddr)) - { - LLQ_State oldstate = q->state; - recvSetupResponse(m, msg->h.flags.b[1] & kDNSFlag1_RC_Mask, q, &opt->u.llq); - m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it - // We have a protocol anomaly here in the LLQ definition. - // Both the challenge packet from the server and the ack+answers packet have opt->u.llq.llqOp == kLLQOp_Setup. - // However, we need to treat them differently: - // The challenge packet has no answers in it, and tells us nothing about whether our cache entries - // are still valid, so this packet should not cause us to do anything that messes with our cache. - // The ack+answers packet gives us the whole truth, so we should handle it by updating our cache - // to match the answers in the packet, and only the answers in the packet. - *matchQuestion = q; - return (oldstate == LLQ_SecondaryRequest ? uDNS_LLQ_Entire : uDNS_LLQ_Ignore); - } - } - } - } - m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it - } - *matchQuestion = mDNSNULL; - return uDNS_LLQ_Not; - } - -// Stub definition of TCPSocket_struct so we can access flags field. (Rest of TCPSocket_struct is platform-dependent.) -struct TCPSocket_struct { TCPSocketFlags flags; /* ... */ }; - -// tcpCallback is called to handle events (e.g. connection opening and data reception) on TCP connections for -// Private DNS operations -- private queries, private LLQs, private record updates and private service updates -mDNSlocal void tcpCallback(TCPSocket *sock, void *context, mDNSBool ConnectionEstablished, mStatus err) - { - tcpInfo_t *tcpInfo = (tcpInfo_t *)context; - mDNSBool closed = mDNSfalse; - mDNS *m = tcpInfo->m; - DNSQuestion *const q = tcpInfo->question; - tcpInfo_t **backpointer = - q ? &q ->tcp : - tcpInfo->rr ? &tcpInfo->rr ->tcp : mDNSNULL; - if (backpointer && *backpointer != tcpInfo) - LogMsg("tcpCallback: %d backpointer %p incorrect tcpInfo %p question %p rr %p", - mDNSPlatformTCPGetFD(tcpInfo->sock), *backpointer, tcpInfo, q, tcpInfo->rr); - - if (err) goto exit; - - if (ConnectionEstablished) - { - mDNSu8 *end = ((mDNSu8*) &tcpInfo->request) + tcpInfo->requestLen; - DomainAuthInfo *AuthInfo; - - // Defensive coding for Crash in mDNSResponder at GetAuthInfoForName_internal + 366 - // Don't know yet what's causing this, but at least we can be cautious and try to avoid crashing if we find our pointers in an unexpected state - if (tcpInfo->rr && tcpInfo->rr->resrec.name != &tcpInfo->rr->namestorage) - LogMsg("tcpCallback: ERROR: tcpInfo->rr->resrec.name %p != &tcpInfo->rr->namestorage %p", - tcpInfo->rr->resrec.name, &tcpInfo->rr->namestorage); - if (tcpInfo->rr && tcpInfo->rr-> resrec.name != &tcpInfo->rr-> namestorage) return; - - AuthInfo = tcpInfo->rr ? GetAuthInfoForName(m, tcpInfo->rr->resrec.name) : mDNSNULL; - - // connection is established - send the message - if (q && q->LongLived && q->state == LLQ_Established) - { - // Lease renewal over TCP, resulting from opening a TCP connection in sendLLQRefresh - end = ((mDNSu8*) &tcpInfo->request) + tcpInfo->requestLen; - } - else if (q && q->LongLived && q->state != LLQ_Poll && !mDNSIPPortIsZero(m->LLQNAT.ExternalPort) && !mDNSIPPortIsZero(q->servPort)) - { - // Notes: - // If we have a NAT port mapping, ExternalPort is the external port - // If we have a routable address so we don't need a port mapping, ExternalPort is the same as our own internal port - // If we need a NAT port mapping but can't get one, then ExternalPort is zero - LLQOptData llqData; // set llq rdata - llqData.vers = kLLQ_Vers; - llqData.llqOp = kLLQOp_Setup; - llqData.err = GetLLQEventPort(m, &tcpInfo->Addr); // We're using TCP; tell server what UDP port to send notifications to - LogInfo("tcpCallback: eventPort %d", llqData.err); - llqData.id = zeroOpaque64; - llqData.llqlease = kLLQ_DefLease; - InitializeDNSMessage(&tcpInfo->request.h, q->TargetQID, uQueryFlags); - end = putLLQ(&tcpInfo->request, tcpInfo->request.data, q, &llqData); - if (!end) { LogMsg("ERROR: tcpCallback - putLLQ"); err = mStatus_UnknownErr; goto exit; } - AuthInfo = q->AuthInfo; // Need to add TSIG to this message - q->ntries = 0; // Reset ntries so that tcp/tls connection failures don't affect sendChallengeResponse failures - } - else if (q) - { - // LLQ Polling mode or non-LLQ uDNS over TCP - InitializeDNSMessage(&tcpInfo->request.h, q->TargetQID, uQueryFlags); - end = putQuestion(&tcpInfo->request, tcpInfo->request.data, tcpInfo->request.data + AbsoluteMaxDNSMessageData, &q->qname, q->qtype, q->qclass); - AuthInfo = q->AuthInfo; // Need to add TSIG to this message - } - - err = mDNSSendDNSMessage(m, &tcpInfo->request, end, mDNSInterface_Any, mDNSNULL, &tcpInfo->Addr, tcpInfo->Port, sock, AuthInfo); - if (err) { debugf("ERROR: tcpCallback: mDNSSendDNSMessage - %d", err); err = mStatus_UnknownErr; goto exit; } - - // Record time we sent this question - if (q) - { - mDNS_Lock(m); - q->LastQTime = m->timenow; - if (q->ThisQInterval < (256 * mDNSPlatformOneSecond)) // Now we have a TCP connection open, make sure we wait at least 256 seconds before retrying - q->ThisQInterval = (256 * mDNSPlatformOneSecond); - SetNextQueryTime(m, q); - mDNS_Unlock(m); - } - } - else - { - long n; - if (tcpInfo->nread < 2) // First read the two-byte length preceeding the DNS message - { - mDNSu8 *lenptr = (mDNSu8 *)&tcpInfo->replylen; - n = mDNSPlatformReadTCP(sock, lenptr + tcpInfo->nread, 2 - tcpInfo->nread, &closed); - if (n < 0) - { - LogMsg("ERROR: tcpCallback - attempt to read message length failed (%d)", n); - err = mStatus_ConnFailed; - goto exit; - } - else if (closed) - { - // It's perfectly fine for this socket to close after the first reply. The server might - // be sending gratuitous replies using UDP and doesn't have a need to leave the TCP socket open. - // We'll only log this event if we've never received a reply before. - // BIND 9 appears to close an idle connection after 30 seconds. - if (tcpInfo->numReplies == 0) - { - LogMsg("ERROR: socket closed prematurely tcpInfo->nread = %d", tcpInfo->nread); - err = mStatus_ConnFailed; - goto exit; - } - else - { - // Note that we may not be doing the best thing if an error occurs after we've sent a second request - // over this tcp connection. That is, we only track whether we've received at least one response - // which may have been to a previous request sent over this tcp connection. - if (backpointer) *backpointer = mDNSNULL; // Clear client backpointer FIRST so we don't risk double-disposing our tcpInfo_t - DisposeTCPConn(tcpInfo); - return; - } - } - - tcpInfo->nread += n; - if (tcpInfo->nread < 2) goto exit; - - tcpInfo->replylen = (mDNSu16)((mDNSu16)lenptr[0] << 8 | lenptr[1]); - if (tcpInfo->replylen < sizeof(DNSMessageHeader)) - { LogMsg("ERROR: tcpCallback - length too short (%d bytes)", tcpInfo->replylen); err = mStatus_UnknownErr; goto exit; } - - tcpInfo->reply = mDNSPlatformMemAllocate(tcpInfo->replylen); - if (!tcpInfo->reply) { LogMsg("ERROR: tcpCallback - malloc failed"); err = mStatus_NoMemoryErr; goto exit; } - } - - n = mDNSPlatformReadTCP(sock, ((char *)tcpInfo->reply) + (tcpInfo->nread - 2), tcpInfo->replylen - (tcpInfo->nread - 2), &closed); - - if (n < 0) - { - LogMsg("ERROR: tcpCallback - read returned %d", n); - err = mStatus_ConnFailed; - goto exit; - } - else if (closed) - { - if (tcpInfo->numReplies == 0) - { - LogMsg("ERROR: socket closed prematurely tcpInfo->nread = %d", tcpInfo->nread); - err = mStatus_ConnFailed; - goto exit; - } - else - { - // Note that we may not be doing the best thing if an error occurs after we've sent a second request - // over this tcp connection. That is, we only track whether we've received at least one response - // which may have been to a previous request sent over this tcp connection. - if (backpointer) *backpointer = mDNSNULL; // Clear client backpointer FIRST so we don't risk double-disposing our tcpInfo_t - DisposeTCPConn(tcpInfo); - return; - } - } - - tcpInfo->nread += n; - - if ((tcpInfo->nread - 2) == tcpInfo->replylen) - { - mDNSBool tls; - DNSMessage *reply = tcpInfo->reply; - mDNSu8 *end = (mDNSu8 *)tcpInfo->reply + tcpInfo->replylen; - mDNSAddr Addr = tcpInfo->Addr; - mDNSIPPort Port = tcpInfo->Port; - mDNSIPPort srcPort = zeroIPPort; - tcpInfo->numReplies++; - tcpInfo->reply = mDNSNULL; // Detach reply buffer from tcpInfo_t, to make sure client callback can't cause it to be disposed - tcpInfo->nread = 0; - tcpInfo->replylen = 0; - - // If we're going to dispose this connection, do it FIRST, before calling client callback - // Note: Sleep code depends on us clearing *backpointer here -- it uses the clearing of rr->tcp - // as the signal that the DNS deregistration operation with the server has completed, and the machine may now sleep - // If we clear the tcp pointer in the question, mDNSCoreReceiveResponse cannot find a matching question. Hence - // we store the minimal information i.e., the source port of the connection in the question itself. - // Dereference sock before it is disposed in DisposeTCPConn below. - - if (sock->flags & kTCPSocketFlags_UseTLS) tls = mDNStrue; - else tls = mDNSfalse; - - if (q && q->tcp) {srcPort = q->tcp->SrcPort; q->tcpSrcPort = srcPort;} - - if (backpointer) - if (!q || !q->LongLived || m->SleepState) - { *backpointer = mDNSNULL; DisposeTCPConn(tcpInfo); } - - mDNSCoreReceive(m, reply, end, &Addr, Port, tls ? (mDNSAddr *)1 : mDNSNULL, srcPort, 0); - // USE CAUTION HERE: Invoking mDNSCoreReceive may have caused the environment to change, including canceling this operation itself - - mDNSPlatformMemFree(reply); - return; - } - } - -exit: - - if (err) - { - // Clear client backpointer FIRST -- that way if one of the callbacks cancels its operation - // we won't end up double-disposing our tcpInfo_t - if (backpointer) *backpointer = mDNSNULL; - - mDNS_Lock(m); // Need to grab the lock to get m->timenow - - if (q) - { - if (q->ThisQInterval == 0) - { - // We get here when we fail to establish a new TCP/TLS connection that would have been used for a new LLQ request or an LLQ renewal. - // Note that ThisQInterval is also zero when sendChallengeResponse resends the LLQ request on an extant TCP/TLS connection. - q->LastQTime = m->timenow; - if (q->LongLived) - { - // We didn't get the chance to send our request packet before the TCP/TLS connection failed. - // We want to retry quickly, but want to back off exponentially in case the server is having issues. - // Since ThisQInterval was 0, we can't just multiply by QuestionIntervalStep, we must track the number - // of TCP/TLS connection failures using ntries. - mDNSu32 count = q->ntries + 1; // want to wait at least 1 second before retrying - - q->ThisQInterval = InitialQuestionInterval; - - for (;count;count--) - q->ThisQInterval *= QuestionIntervalStep; - - if (q->ThisQInterval > LLQ_POLL_INTERVAL) - q->ThisQInterval = LLQ_POLL_INTERVAL; - else - q->ntries++; - - LogMsg("tcpCallback: stream connection for LLQ %##s (%s) failed %d times, retrying in %d ms", q->qname.c, DNSTypeName(q->qtype), q->ntries, q->ThisQInterval); - } - else - { - q->ThisQInterval = MAX_UCAST_POLL_INTERVAL; - LogMsg("tcpCallback: stream connection for %##s (%s) failed, retrying in %d ms", q->qname.c, DNSTypeName(q->qtype), q->ThisQInterval); - } - SetNextQueryTime(m, q); - } - else if (NextQSendTime(q) - m->timenow > (q->LongLived ? LLQ_POLL_INTERVAL : MAX_UCAST_POLL_INTERVAL)) - { - // If we get an error and our next scheduled query for this question is more than the max interval from now, - // reset the next query to ensure we wait no longer the maximum interval from now before trying again. - q->LastQTime = m->timenow; - q->ThisQInterval = q->LongLived ? LLQ_POLL_INTERVAL : MAX_UCAST_POLL_INTERVAL; - SetNextQueryTime(m, q); - LogMsg("tcpCallback: stream connection for %##s (%s) failed, retrying in %d ms", q->qname.c, DNSTypeName(q->qtype), q->ThisQInterval); - } - - // We're about to dispose of the TCP connection, so we must reset the state to retry over TCP/TLS - // because sendChallengeResponse will send the query via UDP if we don't have a tcp pointer. - // Resetting to LLQ_InitialRequest will cause uDNS_CheckCurrentQuestion to call startLLQHandshake, which - // will attempt to establish a new tcp connection. - if (q->LongLived && q->state == LLQ_SecondaryRequest) - q->state = LLQ_InitialRequest; - - // ConnFailed may happen if the server sends a TCP reset or TLS fails, in which case we want to retry establishing the LLQ - // quickly rather than switching to polling mode. This case is handled by the above code to set q->ThisQInterval just above. - // If the error isn't ConnFailed, then the LLQ is in bad shape, so we switch to polling mode. - if (err != mStatus_ConnFailed) - { - if (q->LongLived && q->state != LLQ_Poll) StartLLQPolling(m, q); - } - } - - mDNS_Unlock(m); - - DisposeTCPConn(tcpInfo); - } - } - -mDNSlocal tcpInfo_t *MakeTCPConn(mDNS *const m, const DNSMessage *const msg, const mDNSu8 *const end, - TCPSocketFlags flags, const mDNSAddr *const Addr, const mDNSIPPort Port, domainname *hostname, - DNSQuestion *const question, AuthRecord *const rr) - { - mStatus err; - mDNSIPPort srcport = zeroIPPort; - tcpInfo_t *info; - - if ((flags & kTCPSocketFlags_UseTLS) && (!hostname || !hostname->c[0])) - { LogMsg("MakeTCPConn: TLS connection being setup with NULL hostname"); return mDNSNULL; } - - info = (tcpInfo_t *)mDNSPlatformMemAllocate(sizeof(tcpInfo_t)); - if (!info) { LogMsg("ERROR: MakeTCP - memallocate failed"); return(mDNSNULL); } - mDNSPlatformMemZero(info, sizeof(tcpInfo_t)); - - info->m = m; - info->sock = mDNSPlatformTCPSocket(m, flags, &srcport); - info->requestLen = 0; - info->question = question; - info->rr = rr; - info->Addr = *Addr; - info->Port = Port; - info->reply = mDNSNULL; - info->replylen = 0; - info->nread = 0; - info->numReplies = 0; - info->SrcPort = srcport; - - if (msg) - { - info->requestLen = (int) (end - ((mDNSu8*)msg)); - mDNSPlatformMemCopy(&info->request, msg, info->requestLen); - } - - if (!info->sock) { LogMsg("MakeTCPConn: unable to create TCP socket"); mDNSPlatformMemFree(info); return(mDNSNULL); } - err = mDNSPlatformTCPConnect(info->sock, Addr, Port, hostname, (question ? question->InterfaceID : mDNSNULL), tcpCallback, info); - - // Probably suboptimal here. - // Instead of returning mDNSNULL here on failure, we should probably invoke the callback with an error code. - // That way clients can put all the error handling and retry/recovery code in one place, - // instead of having to handle immediate errors in one place and async errors in another. - // Also: "err == mStatus_ConnEstablished" probably never happens. - - // Don't need to log "connection failed" in customer builds -- it happens quite often during sleep, wake, configuration changes, etc. - if (err == mStatus_ConnEstablished) { tcpCallback(info->sock, info, mDNStrue, mStatus_NoError); } - else if (err != mStatus_ConnPending ) { LogInfo("MakeTCPConn: connection failed"); DisposeTCPConn(info); return(mDNSNULL); } - return(info); - } - -mDNSexport void DisposeTCPConn(struct tcpInfo_t *tcp) - { - mDNSPlatformTCPCloseConnection(tcp->sock); - if (tcp->reply) mDNSPlatformMemFree(tcp->reply); - mDNSPlatformMemFree(tcp); - } - -// Lock must be held -mDNSexport void startLLQHandshake(mDNS *m, DNSQuestion *q) - { - if (mDNSIPv4AddressIsOnes(m->LLQNAT.ExternalAddress)) - { - LogInfo("startLLQHandshake: waiting for NAT status for %##s (%s)", q->qname.c, DNSTypeName(q->qtype)); - q->ThisQInterval = LLQ_POLL_INTERVAL + mDNSRandom(LLQ_POLL_INTERVAL/10); // Retry in approx 15 minutes - q->LastQTime = m->timenow; - SetNextQueryTime(m, q); - return; - } - - // Either we don't have NAT-PMP support (ExternalPort is zero) or behind a Double NAT that may or - // may not have NAT-PMP support (NATResult is non-zero) - if (mDNSIPPortIsZero(m->LLQNAT.ExternalPort) || m->LLQNAT.Result) - { - LogInfo("startLLQHandshake: Cannot receive inbound packets; will poll for %##s (%s) External Port %d, NAT Result %d", - q->qname.c, DNSTypeName(q->qtype), mDNSVal16(m->LLQNAT.ExternalPort), m->LLQNAT.Result); - StartLLQPolling(m, q); - return; - } - - if (mDNSIPPortIsZero(q->servPort)) - { - debugf("startLLQHandshake: StartGetZoneData for %##s (%s)", q->qname.c, DNSTypeName(q->qtype)); - q->ThisQInterval = LLQ_POLL_INTERVAL + mDNSRandom(LLQ_POLL_INTERVAL/10); // Retry in approx 15 minutes - q->LastQTime = m->timenow; - SetNextQueryTime(m, q); - q->servAddr = zeroAddr; - // We know q->servPort is zero because of check above - if (q->nta) CancelGetZoneData(m, q->nta); - q->nta = StartGetZoneData(m, &q->qname, ZoneServiceLLQ, LLQGotZoneData, q); - return; - } - - if (PrivateQuery(q)) - { - if (q->tcp) LogInfo("startLLQHandshake: Disposing existing TCP connection for %##s (%s)", q->qname.c, DNSTypeName(q->qtype)); - if (q->tcp) { DisposeTCPConn(q->tcp); q->tcp = mDNSNULL; } - if (!q->nta) - { - // Normally we lookup the zone data and then call this function. And we never free the zone data - // for "PrivateQuery". But sometimes this can happen due to some race conditions. When we - // switch networks, we might end up "Polling" the network e.g., we are behind a Double NAT. - // When we poll, we free the zone information as we send the query to the server (See - // PrivateQueryGotZoneData). The NAT callback (LLQNATCallback) may happen soon after that. If we - // are still behind Double NAT, we would have returned early in this function. But we could - // have switched to a network with no NATs and we should get the zone data again. - LogInfo("startLLQHandshake: nta is NULL for %##s (%s)", q->qname.c, DNSTypeName(q->qtype)); - q->nta = StartGetZoneData(m, &q->qname, ZoneServiceLLQ, LLQGotZoneData, q); - return; - } - else if (!q->nta->Host.c[0]) - { - // This should not happen. If it happens, we print a log and MakeTCPConn will fail if it can't find a hostname - LogMsg("startLLQHandshake: ERROR!!: nta non NULL for %##s (%s) but HostName %d NULL, LongLived %d", q->qname.c, DNSTypeName(q->qtype), q->nta->Host.c[0], q->LongLived); - } - q->tcp = MakeTCPConn(m, mDNSNULL, mDNSNULL, kTCPSocketFlags_UseTLS, &q->servAddr, q->servPort, &q->nta->Host, q, mDNSNULL); - if (!q->tcp) - q->ThisQInterval = mDNSPlatformOneSecond * 5; // If TCP failed (transient networking glitch) try again in five seconds - else - { - q->state = LLQ_SecondaryRequest; // Right now, for private DNS, we skip the four-way LLQ handshake - q->ReqLease = kLLQ_DefLease; - q->ThisQInterval = 0; - } - q->LastQTime = m->timenow; - SetNextQueryTime(m, q); - } - else - { - debugf("startLLQHandshake: m->AdvertisedV4 %#a%s Server %#a:%d%s %##s (%s)", - &m->AdvertisedV4, mDNSv4AddrIsRFC1918(&m->AdvertisedV4.ip.v4) ? " (RFC 1918)" : "", - &q->servAddr, mDNSVal16(q->servPort), mDNSAddrIsRFC1918(&q->servAddr) ? " (RFC 1918)" : "", - q->qname.c, DNSTypeName(q->qtype)); - - if (q->ntries++ >= kLLQ_MAX_TRIES) - { - LogMsg("startLLQHandshake: %d failed attempts for LLQ %##s Polling.", kLLQ_MAX_TRIES, q->qname.c); - StartLLQPolling(m, q); - } - else - { - mDNSu8 *end; - LLQOptData llqData; - - // set llq rdata - llqData.vers = kLLQ_Vers; - llqData.llqOp = kLLQOp_Setup; - llqData.err = LLQErr_NoError; // Don't need to tell server UDP notification port when sending over UDP - llqData.id = zeroOpaque64; - llqData.llqlease = kLLQ_DefLease; - - InitializeDNSMessage(&m->omsg.h, q->TargetQID, uQueryFlags); - end = putLLQ(&m->omsg, m->omsg.data, q, &llqData); - if (!end) { LogMsg("ERROR: startLLQHandshake - putLLQ"); StartLLQPolling(m,q); return; } - - mDNSSendDNSMessage(m, &m->omsg, end, mDNSInterface_Any, q->LocalSocket, &q->servAddr, q->servPort, mDNSNULL, mDNSNULL); - - // update question state - q->state = LLQ_InitialRequest; - q->ReqLease = kLLQ_DefLease; - q->ThisQInterval = (kLLQ_INIT_RESEND * mDNSPlatformOneSecond); - q->LastQTime = m->timenow; - SetNextQueryTime(m, q); - } - } - } - -// forward declaration so GetServiceTarget can do reverse lookup if needed -mDNSlocal void GetStaticHostname(mDNS *m); - -mDNSexport const domainname *GetServiceTarget(mDNS *m, AuthRecord *const rr) - { - debugf("GetServiceTarget %##s", rr->resrec.name->c); - - if (!rr->AutoTarget) // If not automatically tracking this host's current name, just return the existing target - return(&rr->resrec.rdata->u.srv.target); - else - { -#if APPLE_OSX_mDNSResponder - DomainAuthInfo *AuthInfo = GetAuthInfoForName_internal(m, rr->resrec.name); - if (AuthInfo && AuthInfo->AutoTunnel) - { - // If this AutoTunnel is not yet active, start it now (which entails activating its NAT Traversal request, - // which will subsequently advertise the appropriate records when the NAT Traversal returns a result) - if (!AuthInfo->AutoTunnelNAT.clientContext && m->AutoTunnelHostAddr.b[0]) - { - LogInfo("GetServiceTarget: Calling SetupLocalAutoTunnelInterface_internal"); - SetupLocalAutoTunnelInterface_internal(m, mDNStrue); - } - if (AuthInfo->AutoTunnelHostRecord.namestorage.c[0] == 0) return(mDNSNULL); - debugf("GetServiceTarget: Returning %##s", AuthInfo->AutoTunnelHostRecord.namestorage.c); - return(&AuthInfo->AutoTunnelHostRecord.namestorage); - } - else -#endif // APPLE_OSX_mDNSResponder - { - const int srvcount = CountLabels(rr->resrec.name); - HostnameInfo *besthi = mDNSNULL, *hi; - int best = 0; - for (hi = m->Hostnames; hi; hi = hi->next) - if (hi->arv4.state == regState_Registered || hi->arv4.state == regState_Refresh || - hi->arv6.state == regState_Registered || hi->arv6.state == regState_Refresh) - { - int x, hostcount = CountLabels(&hi->fqdn); - for (x = hostcount < srvcount ? hostcount : srvcount; x > 0 && x > best; x--) - if (SameDomainName(SkipLeadingLabels(rr->resrec.name, srvcount - x), SkipLeadingLabels(&hi->fqdn, hostcount - x))) - { best = x; besthi = hi; } - } - - if (besthi) return(&besthi->fqdn); - } - if (m->StaticHostname.c[0]) return(&m->StaticHostname); - else GetStaticHostname(m); // asynchronously do reverse lookup for primary IPv4 address - LogInfo("GetServiceTarget: Returning NULL for %s", ARDisplayString(m, rr)); - return(mDNSNULL); - } - } - -mDNSlocal const domainname *PUBLIC_UPDATE_SERVICE_TYPE = (const domainname*)"\x0B_dns-update" "\x04_udp"; -mDNSlocal const domainname *PUBLIC_LLQ_SERVICE_TYPE = (const domainname*)"\x08_dns-llq" "\x04_udp"; - -mDNSlocal const domainname *PRIVATE_UPDATE_SERVICE_TYPE = (const domainname*)"\x0F_dns-update-tls" "\x04_tcp"; -mDNSlocal const domainname *PRIVATE_QUERY_SERVICE_TYPE = (const domainname*)"\x0E_dns-query-tls" "\x04_tcp"; -mDNSlocal const domainname *PRIVATE_LLQ_SERVICE_TYPE = (const domainname*)"\x0C_dns-llq-tls" "\x04_tcp"; - -#define ZoneDataSRV(X) (\ - (X)->ZoneService == ZoneServiceUpdate ? ((X)->ZonePrivate ? PRIVATE_UPDATE_SERVICE_TYPE : PUBLIC_UPDATE_SERVICE_TYPE) : \ - (X)->ZoneService == ZoneServiceQuery ? ((X)->ZonePrivate ? PRIVATE_QUERY_SERVICE_TYPE : (const domainname*)"" ) : \ - (X)->ZoneService == ZoneServiceLLQ ? ((X)->ZonePrivate ? PRIVATE_LLQ_SERVICE_TYPE : PUBLIC_LLQ_SERVICE_TYPE ) : (const domainname*)"") - -// Forward reference: GetZoneData_StartQuery references GetZoneData_QuestionCallback, and -// GetZoneData_QuestionCallback calls GetZoneData_StartQuery -mDNSlocal mStatus GetZoneData_StartQuery(mDNS *const m, ZoneData *zd, mDNSu16 qtype); - -// GetZoneData_QuestionCallback is called from normal client callback context (core API calls allowed) -mDNSlocal void GetZoneData_QuestionCallback(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, QC_result AddRecord) - { - ZoneData *zd = (ZoneData*)question->QuestionContext; - - debugf("GetZoneData_QuestionCallback: %s %s", AddRecord ? "Add" : "Rmv", RRDisplayString(m, answer)); - - if (!AddRecord) return; // Don't care about REMOVE events - if (AddRecord == QC_addnocache && answer->rdlength == 0) return; // Don't care about transient failure indications - if (answer->rrtype != question->qtype) return; // Don't care about CNAMEs - - if (answer->rrtype == kDNSType_SOA) - { - debugf("GetZoneData GOT SOA %s", RRDisplayString(m, answer)); - mDNS_StopQuery(m, question); - if (question->ThisQInterval != -1) - LogMsg("GetZoneData_QuestionCallback: Question %##s (%s) ThisQInterval %d not -1", question->qname.c, DNSTypeName(question->qtype), question->ThisQInterval); - if (answer->rdlength) - { - AssignDomainName(&zd->ZoneName, answer->name); - zd->ZoneClass = answer->rrclass; - AssignDomainName(&zd->question.qname, &zd->ZoneName); - GetZoneData_StartQuery(m, zd, kDNSType_SRV); - } - else if (zd->CurrentSOA->c[0]) - { - DomainAuthInfo *AuthInfo = GetAuthInfoForName(m, zd->CurrentSOA); - if (AuthInfo && AuthInfo->AutoTunnel) - { - // To keep the load on the server down, we don't chop down on - // SOA lookups for AutoTunnels - LogInfo("GetZoneData_QuestionCallback: not chopping labels for %##s", zd->CurrentSOA->c); - zd->ZoneDataCallback(m, mStatus_NoSuchNameErr, zd); - } - else - { - zd->CurrentSOA = (domainname *)(zd->CurrentSOA->c + zd->CurrentSOA->c[0]+1); - AssignDomainName(&zd->question.qname, zd->CurrentSOA); - GetZoneData_StartQuery(m, zd, kDNSType_SOA); - } - } - else - { - LogInfo("GetZoneData recursed to root label of %##s without finding SOA", zd->ChildName.c); - zd->ZoneDataCallback(m, mStatus_NoSuchNameErr, zd); - } - } - else if (answer->rrtype == kDNSType_SRV) - { - debugf("GetZoneData GOT SRV %s", RRDisplayString(m, answer)); - mDNS_StopQuery(m, question); - if (question->ThisQInterval != -1) - LogMsg("GetZoneData_QuestionCallback: Question %##s (%s) ThisQInterval %d not -1", question->qname.c, DNSTypeName(question->qtype), question->ThisQInterval); -// Right now we don't want to fail back to non-encrypted operations -// If the AuthInfo has the AutoTunnel field set, then we want private or nothing -// BTMM: Don't fallback to unencrypted operations when SRV lookup fails -#if 0 - if (!answer->rdlength && zd->ZonePrivate && zd->ZoneService != ZoneServiceQuery) - { - zd->ZonePrivate = mDNSfalse; // Causes ZoneDataSRV() to yield a different SRV name when building the query - GetZoneData_StartQuery(m, zd, kDNSType_SRV); // Try again, non-private this time - } - else -#endif - { - if (answer->rdlength) - { - AssignDomainName(&zd->Host, &answer->rdata->u.srv.target); - zd->Port = answer->rdata->u.srv.port; - AssignDomainName(&zd->question.qname, &zd->Host); - GetZoneData_StartQuery(m, zd, kDNSType_A); - } - else - { - zd->ZonePrivate = mDNSfalse; - zd->Host.c[0] = 0; - zd->Port = zeroIPPort; - zd->Addr = zeroAddr; - zd->ZoneDataCallback(m, mStatus_NoError, zd); - } - } - } - else if (answer->rrtype == kDNSType_A) - { - debugf("GetZoneData GOT A %s", RRDisplayString(m, answer)); - mDNS_StopQuery(m, question); - if (question->ThisQInterval != -1) - LogMsg("GetZoneData_QuestionCallback: Question %##s (%s) ThisQInterval %d not -1", question->qname.c, DNSTypeName(question->qtype), question->ThisQInterval); - zd->Addr.type = mDNSAddrType_IPv4; - zd->Addr.ip.v4 = (answer->rdlength == 4) ? answer->rdata->u.ipv4 : zerov4Addr; - // In order to simulate firewalls blocking our outgoing TCP connections, returning immediate ICMP errors or TCP resets, - // the code below will make us try to connect to loopback, resulting in an immediate "port unreachable" failure. - // This helps us test to make sure we handle this case gracefully - // BTMM: mDNSResponder taking 100 percent CPU after upgrading to 10.5.1 -#if 0 - zd->Addr.ip.v4.b[0] = 127; - zd->Addr.ip.v4.b[1] = 0; - zd->Addr.ip.v4.b[2] = 0; - zd->Addr.ip.v4.b[3] = 1; -#endif - // The caller needs to free the memory when done with zone data - zd->ZoneDataCallback(m, mStatus_NoError, zd); - } - } - -// GetZoneData_StartQuery is called from normal client context (lock not held, or client callback) -mDNSlocal mStatus GetZoneData_StartQuery(mDNS *const m, ZoneData *zd, mDNSu16 qtype) - { - if (qtype == kDNSType_SRV) - { - AssignDomainName(&zd->question.qname, ZoneDataSRV(zd)); - AppendDomainName(&zd->question.qname, &zd->ZoneName); - debugf("lookupDNSPort %##s", zd->question.qname.c); - } - - // CancelGetZoneData can get called at any time. We should stop the question if it has not been - // stopped already. A value of -1 for ThisQInterval indicates that the question is not active - // yet. - zd->question.ThisQInterval = -1; - zd->question.InterfaceID = mDNSInterface_Any; - zd->question.Target = zeroAddr; - //zd->question.qname.c[0] = 0; // Already set - zd->question.qtype = qtype; - zd->question.qclass = kDNSClass_IN; - zd->question.LongLived = mDNSfalse; - zd->question.ExpectUnique = mDNStrue; - zd->question.ForceMCast = mDNSfalse; - zd->question.ReturnIntermed = mDNStrue; - zd->question.SuppressUnusable = mDNSfalse; - zd->question.SearchListIndex = 0; - zd->question.AppendSearchDomains = 0; - zd->question.RetryWithSearchDomains = mDNSfalse; - zd->question.TimeoutQuestion = 0; - zd->question.WakeOnResolve = 0; - zd->question.qnameOrig = mDNSNULL; - zd->question.QuestionCallback = GetZoneData_QuestionCallback; - zd->question.QuestionContext = zd; - - //LogMsg("GetZoneData_StartQuery %##s (%s) %p", zd->question.qname.c, DNSTypeName(zd->question.qtype), zd->question.Private); - return(mDNS_StartQuery(m, &zd->question)); - } - -// StartGetZoneData is an internal routine (i.e. must be called with the lock already held) -mDNSexport ZoneData *StartGetZoneData(mDNS *const m, const domainname *const name, const ZoneService target, ZoneDataCallback callback, void *ZoneDataContext) - { - DomainAuthInfo *AuthInfo = GetAuthInfoForName_internal(m, name); - int initialskip = (AuthInfo && AuthInfo->AutoTunnel) ? DomainNameLength(name) - DomainNameLength(&AuthInfo->domain) : 0; - ZoneData *zd = (ZoneData*)mDNSPlatformMemAllocate(sizeof(ZoneData)); - if (!zd) { LogMsg("ERROR: StartGetZoneData - mDNSPlatformMemAllocate failed"); return mDNSNULL; } - mDNSPlatformMemZero(zd, sizeof(ZoneData)); - AssignDomainName(&zd->ChildName, name); - zd->ZoneService = target; - zd->CurrentSOA = (domainname *)(&zd->ChildName.c[initialskip]); - zd->ZoneName.c[0] = 0; - zd->ZoneClass = 0; - zd->Host.c[0] = 0; - zd->Port = zeroIPPort; - zd->Addr = zeroAddr; - zd->ZonePrivate = AuthInfo && AuthInfo->AutoTunnel ? mDNStrue : mDNSfalse; - zd->ZoneDataCallback = callback; - zd->ZoneDataContext = ZoneDataContext; - - zd->question.QuestionContext = zd; - - mDNS_DropLockBeforeCallback(); // GetZoneData_StartQuery expects to be called from a normal callback, so we emulate that here - if (AuthInfo && AuthInfo->AutoTunnel && !mDNSIPPortIsZero(AuthInfo->port)) - { - LogInfo("StartGetZoneData: Bypassing SOA, SRV query for %##s", AuthInfo->domain.c); - // We bypass SOA and SRV queries if we know the hostname and port already from the configuration. - // Today this is only true for AutoTunnel. As we bypass, we need to infer a few things: - // - // 1. Zone name is the same as the AuthInfo domain - // 2. ZoneClass is kDNSClass_IN which should be a safe assumption - // - // If we want to make this bypass mechanism work for non-AutoTunnels also, (1) has to hold - // good. Otherwise, it has to be configured also. - - AssignDomainName(&zd->ZoneName, &AuthInfo->domain); - zd->ZoneClass = kDNSClass_IN; - AssignDomainName(&zd->Host, &AuthInfo->hostname); - zd->Port = AuthInfo->port; - AssignDomainName(&zd->question.qname, &zd->Host); - GetZoneData_StartQuery(m, zd, kDNSType_A); - } - else - { - if (AuthInfo && AuthInfo->AutoTunnel) LogInfo("StartGetZoneData: Not Bypassing SOA, SRV query for %##s", AuthInfo->domain.c); - AssignDomainName(&zd->question.qname, zd->CurrentSOA); - GetZoneData_StartQuery(m, zd, kDNSType_SOA); - } - mDNS_ReclaimLockAfterCallback(); - - return zd; - } - -// Returns if the question is a GetZoneData question. These questions are special in -// that they are created internally while resolving a private query or LLQs. -mDNSexport mDNSBool IsGetZoneDataQuestion(DNSQuestion *q) - { - if (q->QuestionCallback == GetZoneData_QuestionCallback) return(mDNStrue); - else return(mDNSfalse); - } - -// GetZoneData queries are a special case -- even if we have a key for them, we don't do them privately, -// because that would result in an infinite loop (i.e. to do a private query we first need to get -// the _dns-query-tls SRV record for the zone, and we can't do *that* privately because to do so -// we'd need to already know the _dns-query-tls SRV record. -// Also, as a general rule, we never do SOA queries privately -mDNSexport DomainAuthInfo *GetAuthInfoForQuestion(mDNS *m, const DNSQuestion *const q) // Must be called with lock held - { - if (q->QuestionCallback == GetZoneData_QuestionCallback) return(mDNSNULL); - if (q->qtype == kDNSType_SOA ) return(mDNSNULL); - return(GetAuthInfoForName_internal(m, &q->qname)); - } - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - host name and interface management -#endif - -mDNSlocal void SendRecordRegistration(mDNS *const m, AuthRecord *rr); -mDNSlocal void SendRecordDeregistration(mDNS *m, AuthRecord *rr); -mDNSlocal mDNSBool IsRecordMergeable(mDNS *const m, AuthRecord *rr, mDNSs32 time); - -// When this function is called, service record is already deregistered. We just -// have to deregister the PTR and TXT records. -mDNSlocal void UpdateAllServiceRecords(mDNS *const m, AuthRecord *rr, mDNSBool reg) - { - AuthRecord *r, *srvRR; - - if (rr->resrec.rrtype != kDNSType_SRV) { LogMsg("UpdateAllServiceRecords:ERROR!! ResourceRecord not a service record %s", ARDisplayString(m, rr)); return; } - - if (reg && rr->state == regState_NoTarget) { LogMsg("UpdateAllServiceRecords:ERROR!! SRV record %s in noTarget state during registration", ARDisplayString(m, rr)); return; } - - LogInfo("UpdateAllServiceRecords: ResourceRecord %s", ARDisplayString(m, rr)); - - for (r = m->ResourceRecords; r; r=r->next) - { - if (!AuthRecord_uDNS(r)) continue; - srvRR = mDNSNULL; - if (r->resrec.rrtype == kDNSType_PTR) - srvRR = r->Additional1; - else if (r->resrec.rrtype == kDNSType_TXT) - srvRR = r->DependentOn; - if (srvRR && srvRR->resrec.rrtype != kDNSType_SRV) - LogMsg("UpdateAllServiceRecords: ERROR!! Resource record %s wrong, expecting SRV type", ARDisplayString(m, srvRR)); - if (srvRR == rr) - { - if (!reg) - { - LogInfo("UpdateAllServiceRecords: deregistering %s", ARDisplayString(m, r)); - r->SRVChanged = mDNStrue; - r->ThisAPInterval = INIT_RECORD_REG_INTERVAL; - r->LastAPTime = m->timenow - INIT_RECORD_REG_INTERVAL; - r->state = regState_DeregPending; - } - else - { - // Clearing SRVchanged is a safety measure. If our pevious dereg never - // came back and we had a target change, we are starting fresh - r->SRVChanged = mDNSfalse; - // if it is already registered or in the process of registering, then don't - // bother re-registering. This happens today for non-BTMM domains where the - // TXT and PTR get registered before SRV records because of the delay in - // getting the port mapping. There is no point in re-registering the TXT - // and PTR records. - if ((r->state == regState_Registered) || - (r->state == regState_Pending && r->nta && !mDNSIPv4AddressIsZero(r->nta->Addr.ip.v4))) - LogInfo("UpdateAllServiceRecords: not registering %s, state %d", ARDisplayString(m, r), r->state); - else - { - LogInfo("UpdateAllServiceRecords: registering %s, state %d", ARDisplayString(m, r), r->state); - ActivateUnicastRegistration(m, r); - } - } - } - } - } - -// Called in normal client context (lock not held) -// Currently only supports SRV records for nat mapping -mDNSlocal void CompleteRecordNatMap(mDNS *m, NATTraversalInfo *n) - { - const domainname *target; - domainname *srvt; - AuthRecord *rr = (AuthRecord *)n->clientContext; - debugf("SRVNatMap complete %.4a IntPort %u ExternalPort %u NATLease %u", &n->ExternalAddress, mDNSVal16(n->IntPort), mDNSVal16(n->ExternalPort), n->NATLease); - - if (!rr) { LogMsg("CompleteRecordNatMap called with unknown AuthRecord object"); return; } - if (!n->NATLease) { LogMsg("CompleteRecordNatMap No NATLease for %s", ARDisplayString(m, rr)); return; } - - if (rr->resrec.rrtype != kDNSType_SRV) {LogMsg("CompleteRecordNatMap: Not a service record %s", ARDisplayString(m, rr)); return; } - - if (rr->resrec.RecordType == kDNSRecordTypeDeregistering) { LogInfo("CompleteRecordNatMap called for %s, Service deregistering", ARDisplayString(m, rr)); return; } - - if (rr->state == regState_DeregPending) { LogInfo("CompleteRecordNatMap called for %s, record in DeregPending", ARDisplayString(m, rr)); return; } - - // As we free the zone info after registering/deregistering with the server (See hndlRecordUpdateReply), - // we need to restart the get zone data and nat mapping request to get the latest mapping result as we can't handle it - // at this moment. Restart from the beginning. - if (!rr->nta || mDNSIPv4AddressIsZero(rr->nta->Addr.ip.v4)) - { - LogInfo("CompleteRecordNatMap called for %s but no zone information!", ARDisplayString(m, rr)); - // We need to clear out the NATinfo state so that it will result in re-acquiring the mapping - // and hence this callback called again. - if (rr->NATinfo.clientContext) - { - mDNS_StopNATOperation_internal(m, &rr->NATinfo); - rr->NATinfo.clientContext = mDNSNULL; - } - rr->state = regState_Pending; - rr->ThisAPInterval = INIT_RECORD_REG_INTERVAL; - rr->LastAPTime = m->timenow - INIT_RECORD_REG_INTERVAL; - return; - } - - mDNS_Lock(m); - // Reevaluate the target always as Target could have changed while - // we were getting the port mapping (See UpdateOneSRVRecord) - target = GetServiceTarget(m, rr); - srvt = GetRRDomainNameTarget(&rr->resrec); - if (!target || target->c[0] == 0 || mDNSIPPortIsZero(n->ExternalPort)) - { - if (target && target->c[0]) - LogInfo("CompleteRecordNatMap - Target %##s for ResourceRecord %##s, ExternalPort %d", target->c, rr->resrec.name->c, mDNSVal16(n->ExternalPort)); - else - LogInfo("CompleteRecordNatMap - no target for %##s, ExternalPort %d", rr->resrec.name->c, mDNSVal16(n->ExternalPort)); - if (srvt) srvt->c[0] = 0; - rr->state = regState_NoTarget; - rr->resrec.rdlength = rr->resrec.rdestimate = 0; - mDNS_Unlock(m); - UpdateAllServiceRecords(m, rr, mDNSfalse); - return; - } - LogInfo("CompleteRecordNatMap - Target %##s for ResourceRecord %##s, ExternalPort %d", target->c, rr->resrec.name->c, mDNSVal16(n->ExternalPort)); - // This function might get called multiple times during a network transition event. Previosuly, we could - // have put the SRV record in NoTarget state above and deregistered all the other records. When this - // function gets called again with a non-zero ExternalPort, we need to set the target and register the - // other records again. - if (srvt && !SameDomainName(srvt, target)) - { - AssignDomainName(srvt, target); - SetNewRData(&rr->resrec, mDNSNULL, 0); // Update rdlength, rdestimate, rdatahash - } - - // SRVChanged is set when when the target of the SRV record changes (See UpdateOneSRVRecord). - // As a result of the target change, we might register just that SRV Record if it was - // previously registered and we have a new target OR deregister SRV (and the associated - // PTR/TXT records) if we don't have a target anymore. When we get a response from the server, - // SRVChanged state tells that we registered/deregistered because of a target change - // and hence handle accordingly e.g., if we deregistered, put the records in NoTarget state OR - // if we registered then put it in Registered state. - // - // Here, we are registering all the records again from the beginning. Treat this as first time - // registration rather than a temporary target change. - rr->SRVChanged = mDNSfalse; - - // We want IsRecordMergeable to check whether it is a record whose update can be - // sent with others. We set the time before we call IsRecordMergeable, so that - // it does not fail this record based on time. We are interested in other checks - // at this time - rr->state = regState_Pending; - rr->ThisAPInterval = INIT_RECORD_REG_INTERVAL; - rr->LastAPTime = m->timenow - INIT_RECORD_REG_INTERVAL; - if (IsRecordMergeable(m, rr, m->timenow + MERGE_DELAY_TIME)) - // Delay the record registration by MERGE_DELAY_TIME so that we can merge them - // into one update - rr->LastAPTime += MERGE_DELAY_TIME; - mDNS_Unlock(m); - // We call this always even though it may not be necessary always e.g., normal registration - // process where TXT and PTR gets registered followed by the SRV record after it gets - // the port mapping. In that case, UpdateAllServiceRecords handles the optimization. The - // update of TXT and PTR record is required if we entered noTargetState before as explained - // above. - UpdateAllServiceRecords(m, rr, mDNStrue); - } - -mDNSlocal void StartRecordNatMap(mDNS *m, AuthRecord *rr) - { - const mDNSu8 *p; - mDNSu8 protocol; - - if (rr->resrec.rrtype != kDNSType_SRV) - { - LogInfo("StartRecordNatMap: Resource Record %##s type %d, not supported", rr->resrec.name->c, rr->resrec.rrtype); - return; - } - p = rr->resrec.name->c; - //Assume ... - // Skip the first two labels to get to the transport protocol - if (p[0]) p += 1 + p[0]; - if (p[0]) p += 1 + p[0]; - if (SameDomainLabel(p, (mDNSu8 *)"\x4" "_tcp")) protocol = NATOp_MapTCP; - else if (SameDomainLabel(p, (mDNSu8 *)"\x4" "_udp")) protocol = NATOp_MapUDP; - else { LogMsg("StartRecordNatMap: could not determine transport protocol of service %##s", rr->resrec.name->c); return; } - - //LogMsg("StartRecordNatMap: clientContext %p IntPort %d srv.port %d %s", - // rr->NATinfo.clientContext, mDNSVal16(rr->NATinfo.IntPort), mDNSVal16(rr->resrec.rdata->u.srv.port), ARDisplayString(m, rr)); - if (rr->NATinfo.clientContext) mDNS_StopNATOperation_internal(m, &rr->NATinfo); - rr->NATinfo.Protocol = protocol; - - // Shouldn't be trying to set IntPort here -- - // BuildUpdateMessage overwrites srs->RR_SRV.resrec.rdata->u.srv.port with external (mapped) port number - rr->NATinfo.IntPort = rr->resrec.rdata->u.srv.port; - rr->NATinfo.RequestedPort = rr->resrec.rdata->u.srv.port; - rr->NATinfo.NATLease = 0; // Request default lease - rr->NATinfo.clientCallback = CompleteRecordNatMap; - rr->NATinfo.clientContext = rr; - mDNS_StartNATOperation_internal(m, &rr->NATinfo); - } - -// Unlink an Auth Record from the m->ResourceRecords list. -// When a resource record enters regState_NoTarget initially, mDNS_Register_internal -// does not initialize completely e.g., it cannot check for duplicates etc. The resource -// record is temporarily left in the ResourceRecords list so that we can initialize later -// when the target is resolvable. Similarly, when host name changes, we enter regState_NoTarget -// and we do the same. - -// This UnlinkResourceRecord routine is very worrying. It bypasses all the normal cleanup performed -// by mDNS_Deregister_internal and just unceremoniously cuts the record from the active list. -// This is why re-regsitering this record was producing syslog messages like this: -// "Error! Tried to add a NAT traversal that's already in the active list" -// Right now UnlinkResourceRecord is fortunately only called by RegisterAllServiceRecords, -// which then immediately calls mDNS_Register_internal to re-register the record, which probably -// masked more serious problems. Any other use of UnlinkResourceRecord is likely to lead to crashes. -// For now we'll workaround that specific problem by explicitly calling mDNS_StopNATOperation_internal, -// but long-term we should either stop cancelling the record registration and then re-registering it, -// or if we really do need to do this for some reason it should be done via the usual -// mDNS_Deregister_internal path instead of just cutting the record from the list. - -mDNSlocal mStatus UnlinkResourceRecord(mDNS *const m, AuthRecord *const rr) - { - AuthRecord **list = &m->ResourceRecords; - while (*list && *list != rr) list = &(*list)->next; - if (*list) - { - *list = rr->next; - rr->next = mDNSNULL; - - // Temporary workaround to cancel any active NAT mapping operation - if (rr->NATinfo.clientContext) - { - mDNS_StopNATOperation_internal(m, &rr->NATinfo); - rr->NATinfo.clientContext = mDNSNULL; - if (rr->resrec.rrtype == kDNSType_SRV) rr->resrec.rdata->u.srv.port = rr->NATinfo.IntPort; - } - - return(mStatus_NoError); - } - LogMsg("UnlinkResourceRecord:ERROR!! - no such active record %##s", rr->resrec.name->c); - return(mStatus_NoSuchRecord); - } - -// We need to go through mDNS_Register again as we did not complete the -// full initialization last time e.g., duplicate checks. -// After we register, we will be in regState_GetZoneData. -mDNSlocal void RegisterAllServiceRecords(mDNS *const m, AuthRecord *rr) - { - LogInfo("RegisterAllServiceRecords: Service Record %##s", rr->resrec.name->c); - // First Register the service record, we do this differently from other records because - // when it entered NoTarget state, it did not go through complete initialization - rr->SRVChanged = mDNSfalse; - UnlinkResourceRecord(m, rr); - mDNS_Register_internal(m, rr); - // Register the other records - UpdateAllServiceRecords(m, rr, mDNStrue); - } - -// Called with lock held -mDNSlocal void UpdateOneSRVRecord(mDNS *m, AuthRecord *rr) - { - // Target change if: - // We have a target and were previously waiting for one, or - // We had a target and no longer do, or - // The target has changed - - domainname *curtarget = &rr->resrec.rdata->u.srv.target; - const domainname *const nt = GetServiceTarget(m, rr); - const domainname *const newtarget = nt ? nt : (domainname*)""; - mDNSBool TargetChanged = (newtarget->c[0] && rr->state == regState_NoTarget) || !SameDomainName(curtarget, newtarget); - mDNSBool HaveZoneData = rr->nta && !mDNSIPv4AddressIsZero(rr->nta->Addr.ip.v4); - - // Nat state change if: - // We were behind a NAT, and now we are behind a new NAT, or - // We're not behind a NAT but our port was previously mapped to a different external port - // We were not behind a NAT and now we are - - mDNSIPPort port = rr->resrec.rdata->u.srv.port; - mDNSBool NowNeedNATMAP = (rr->AutoTarget == Target_AutoHostAndNATMAP && !mDNSIPPortIsZero(port) && mDNSv4AddrIsRFC1918(&m->AdvertisedV4.ip.v4) && rr->nta && !mDNSAddrIsRFC1918(&rr->nta->Addr)); - mDNSBool WereBehindNAT = (rr->NATinfo.clientContext != mDNSNULL); - mDNSBool PortWasMapped = (rr->NATinfo.clientContext && !mDNSSameIPPort(rr->NATinfo.RequestedPort, port)); // I think this is always false -- SC Sept 07 - mDNSBool NATChanged = (!WereBehindNAT && NowNeedNATMAP) || (!NowNeedNATMAP && PortWasMapped); - - (void)HaveZoneData; //unused - - LogInfo("UpdateOneSRVRecord: Resource Record %s TargetChanged %d, NewTarget %##s", ARDisplayString(m, rr), TargetChanged, nt->c); - - debugf("UpdateOneSRVRecord: %##s newtarget %##s TargetChanged %d HaveZoneData %d port %d NowNeedNATMAP %d WereBehindNAT %d PortWasMapped %d NATChanged %d", - rr->resrec.name->c, newtarget, - TargetChanged, HaveZoneData, mDNSVal16(port), NowNeedNATMAP, WereBehindNAT, PortWasMapped, NATChanged); - - if (m->mDNS_busy != m->mDNS_reentrancy+1) - LogMsg("UpdateOneSRVRecord: Lock not held! mDNS_busy (%ld) mDNS_reentrancy (%ld)", m->mDNS_busy, m->mDNS_reentrancy); - - if (!TargetChanged && !NATChanged) return; - - // If we are deregistering the record, then ignore any NAT/Target change. - if (rr->resrec.RecordType == kDNSRecordTypeDeregistering) - { - LogInfo("UpdateOneSRVRecord: Deregistering record, Ignoring TargetChanged %d, NATChanged %d for %##s, state %d", TargetChanged, NATChanged, - rr->resrec.name->c, rr->state); - return; - } - - if (newtarget) - LogInfo("UpdateOneSRVRecord: TargetChanged %d, NATChanged %d for %##s, state %d, newtarget %##s", TargetChanged, NATChanged, rr->resrec.name->c, rr->state, newtarget->c); - else - LogInfo("UpdateOneSRVRecord: TargetChanged %d, NATChanged %d for %##s, state %d, null newtarget", TargetChanged, NATChanged, rr->resrec.name->c, rr->state); - switch(rr->state) - { - case regState_NATMap: - // In these states, the SRV has either not yet been registered (it will get up-to-date information when it is) - // or is in the process of, or has already been, deregistered. This assumes that whenever we transition out - // of this state, we need to look at the target again. - return; - - case regState_UpdatePending: - // We are getting a Target change/NAT change while the SRV record is being updated ? - // let us not do anything for now. - return; - - case regState_NATError: - if (!NATChanged) return; - // if nat changed, register if we have a target (below) - - case regState_NoTarget: - if (!newtarget->c[0]) - { - LogInfo("UpdateOneSRVRecord: No target yet for Resource Record %s", ARDisplayString(m, rr)); - return; - } - RegisterAllServiceRecords(m , rr); - return; - case regState_DeregPending: - // We are in DeregPending either because the service was deregistered from above or we handled - // a NAT/Target change before and sent the deregistration below. There are a few race conditions - // possible - // - // 1. We are handling a second NAT/Target change while the first dereg is in progress. It is possible - // that first dereg never made it through because there was no network connectivity e.g., disconnecting - // from network triggers this function due to a target change and later connecting to the network - // retriggers this function but the deregistration never made it through yet. Just fall through. - // If there is a target register otherwise deregister. - // - // 2. While we sent the dereg during a previous NAT/Target change, uDNS_DeregisterRecord gets - // called as part of service deregistration. When the response comes back, we call - // CompleteDeregistration rather than handle NAT/Target change because the record is in - // kDNSRecordTypeDeregistering state. - // - // 3. If the upper layer deregisters the service, we check for kDNSRecordTypeDeregistering both - // here in this function to avoid handling NAT/Target change and in hndlRecordUpdateReply to call - // CompleteDeregistration instead of handling NAT/Target change. Hence, we are not concerned - // about that case here. - // - // We just handle case (1) by falling through - case regState_Pending: - case regState_Refresh: - case regState_Registered: - // target or nat changed. deregister service. upon completion, we'll look for a new target - rr->SRVChanged = mDNStrue; - rr->ThisAPInterval = INIT_RECORD_REG_INTERVAL; - rr->LastAPTime = m->timenow - INIT_RECORD_REG_INTERVAL; - if (newtarget->c[0]) - { - LogInfo("UpdateOneSRVRecord: SRV record changed for service %##s, registering with new target %##s", - rr->resrec.name->c, newtarget->c); - rr->state = regState_Pending; - } - else - { - LogInfo("UpdateOneSRVRecord: SRV record changed for service %##s de-registering", rr->resrec.name->c); - rr->state = regState_DeregPending; - UpdateAllServiceRecords(m, rr, mDNSfalse); - } - return; - case regState_Unregistered: - default: LogMsg("UpdateOneSRVRecord: Unknown state %d for %##s", rr->state, rr->resrec.name->c); - } - } - -mDNSexport void UpdateAllSRVRecords(mDNS *m) - { - m->NextSRVUpdate = 0; - LogInfo("UpdateAllSRVRecords %d", m->SleepState); - - if (m->CurrentRecord) - LogMsg("UpdateAllSRVRecords ERROR m->CurrentRecord already set %s", ARDisplayString(m, m->CurrentRecord)); - m->CurrentRecord = m->ResourceRecords; - while (m->CurrentRecord) - { - AuthRecord *rptr = m->CurrentRecord; - m->CurrentRecord = m->CurrentRecord->next; - if (AuthRecord_uDNS(rptr) && rptr->resrec.rrtype == kDNSType_SRV) - UpdateOneSRVRecord(m, rptr); - } - } - -// Forward reference: AdvertiseHostname references HostnameCallback, and HostnameCallback calls AdvertiseHostname -mDNSlocal void HostnameCallback(mDNS *const m, AuthRecord *const rr, mStatus result); - -// Called in normal client context (lock not held) -mDNSlocal void hostnameGetPublicAddressCallback(mDNS *m, NATTraversalInfo *n) - { - HostnameInfo *h = (HostnameInfo *)n->clientContext; - - if (!h) { LogMsg("RegisterHostnameRecord: registration cancelled"); return; } - - if (!n->Result) - { - if (mDNSIPv4AddressIsZero(n->ExternalAddress) || mDNSv4AddrIsRFC1918(&n->ExternalAddress)) return; - - if (h->arv4.resrec.RecordType) - { - if (mDNSSameIPv4Address(h->arv4.resrec.rdata->u.ipv4, n->ExternalAddress)) return; // If address unchanged, do nothing - LogInfo("Updating hostname %p %##s IPv4 from %.4a to %.4a (NAT gateway's external address)",n, - h->arv4.resrec.name->c, &h->arv4.resrec.rdata->u.ipv4, &n->ExternalAddress); - mDNS_Deregister(m, &h->arv4); // mStatus_MemFree callback will re-register with new address - } - else - { - LogInfo("Advertising hostname %##s IPv4 %.4a (NAT gateway's external address)", h->arv4.resrec.name->c, &n->ExternalAddress); - h->arv4.resrec.RecordType = kDNSRecordTypeKnownUnique; - h->arv4.resrec.rdata->u.ipv4 = n->ExternalAddress; - mDNS_Register(m, &h->arv4); - } - } - } - -// register record or begin NAT traversal -mDNSlocal void AdvertiseHostname(mDNS *m, HostnameInfo *h) - { - if (!mDNSIPv4AddressIsZero(m->AdvertisedV4.ip.v4) && h->arv4.resrec.RecordType == kDNSRecordTypeUnregistered) - { - mDNS_SetupResourceRecord(&h->arv4, mDNSNULL, mDNSInterface_Any, kDNSType_A, kHostNameTTL, kDNSRecordTypeUnregistered, AuthRecordAny, HostnameCallback, h); - AssignDomainName(&h->arv4.namestorage, &h->fqdn); - h->arv4.resrec.rdata->u.ipv4 = m->AdvertisedV4.ip.v4; - h->arv4.state = regState_Unregistered; - if (mDNSv4AddrIsRFC1918(&m->AdvertisedV4.ip.v4)) - { - // If we already have a NAT query active, stop it and restart it to make sure we get another callback - if (h->natinfo.clientContext) mDNS_StopNATOperation_internal(m, &h->natinfo); - h->natinfo.Protocol = 0; - h->natinfo.IntPort = zeroIPPort; - h->natinfo.RequestedPort = zeroIPPort; - h->natinfo.NATLease = 0; - h->natinfo.clientCallback = hostnameGetPublicAddressCallback; - h->natinfo.clientContext = h; - mDNS_StartNATOperation_internal(m, &h->natinfo); - } - else - { - LogInfo("Advertising hostname %##s IPv4 %.4a", h->arv4.resrec.name->c, &m->AdvertisedV4.ip.v4); - h->arv4.resrec.RecordType = kDNSRecordTypeKnownUnique; - mDNS_Register_internal(m, &h->arv4); - } - } - - if (!mDNSIPv6AddressIsZero(m->AdvertisedV6.ip.v6) && h->arv6.resrec.RecordType == kDNSRecordTypeUnregistered) - { - mDNS_SetupResourceRecord(&h->arv6, mDNSNULL, mDNSInterface_Any, kDNSType_AAAA, kHostNameTTL, kDNSRecordTypeKnownUnique, AuthRecordAny, HostnameCallback, h); - AssignDomainName(&h->arv6.namestorage, &h->fqdn); - h->arv6.resrec.rdata->u.ipv6 = m->AdvertisedV6.ip.v6; - h->arv6.state = regState_Unregistered; - LogInfo("Advertising hostname %##s IPv6 %.16a", h->arv6.resrec.name->c, &m->AdvertisedV6.ip.v6); - mDNS_Register_internal(m, &h->arv6); - } - } - -mDNSlocal void HostnameCallback(mDNS *const m, AuthRecord *const rr, mStatus result) - { - HostnameInfo *hi = (HostnameInfo *)rr->RecordContext; - - if (result == mStatus_MemFree) - { - if (hi) - { - // If we're still in the Hostnames list, update to new address - HostnameInfo *i; - LogInfo("HostnameCallback: Got mStatus_MemFree for %p %p %s", hi, rr, ARDisplayString(m, rr)); - for (i = m->Hostnames; i; i = i->next) - if (rr == &i->arv4 || rr == &i->arv6) - { mDNS_Lock(m); AdvertiseHostname(m, i); mDNS_Unlock(m); return; } - - // Else, we're not still in the Hostnames list, so free the memory - if (hi->arv4.resrec.RecordType == kDNSRecordTypeUnregistered && - hi->arv6.resrec.RecordType == kDNSRecordTypeUnregistered) - { - if (hi->natinfo.clientContext) mDNS_StopNATOperation_internal(m, &hi->natinfo); - hi->natinfo.clientContext = mDNSNULL; - mDNSPlatformMemFree(hi); // free hi when both v4 and v6 AuthRecs deallocated - } - } - return; - } - - if (result) - { - // don't unlink or free - we can retry when we get a new address/router - if (rr->resrec.rrtype == kDNSType_A) - LogMsg("HostnameCallback: Error %d for registration of %##s IP %.4a", result, rr->resrec.name->c, &rr->resrec.rdata->u.ipv4); - else - LogMsg("HostnameCallback: Error %d for registration of %##s IP %.16a", result, rr->resrec.name->c, &rr->resrec.rdata->u.ipv6); - if (!hi) { mDNSPlatformMemFree(rr); return; } - if (rr->state != regState_Unregistered) LogMsg("Error: HostnameCallback invoked with error code for record not in regState_Unregistered!"); - - if (hi->arv4.state == regState_Unregistered && - hi->arv6.state == regState_Unregistered) - { - // only deliver status if both v4 and v6 fail - rr->RecordContext = (void *)hi->StatusContext; - if (hi->StatusCallback) - hi->StatusCallback(m, rr, result); // client may NOT make API calls here - rr->RecordContext = (void *)hi; - } - return; - } - - // register any pending services that require a target - mDNS_Lock(m); - m->NextSRVUpdate = NonZeroTime(m->timenow); - mDNS_Unlock(m); - - // Deliver success to client - if (!hi) { LogMsg("HostnameCallback invoked with orphaned address record"); return; } - if (rr->resrec.rrtype == kDNSType_A) - LogInfo("Registered hostname %##s IP %.4a", rr->resrec.name->c, &rr->resrec.rdata->u.ipv4); - else - LogInfo("Registered hostname %##s IP %.16a", rr->resrec.name->c, &rr->resrec.rdata->u.ipv6); - - rr->RecordContext = (void *)hi->StatusContext; - if (hi->StatusCallback) - hi->StatusCallback(m, rr, result); // client may NOT make API calls here - rr->RecordContext = (void *)hi; - } - -mDNSlocal void FoundStaticHostname(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, QC_result AddRecord) - { - const domainname *pktname = &answer->rdata->u.name; - domainname *storedname = &m->StaticHostname; - HostnameInfo *h = m->Hostnames; - - (void)question; - - if (answer->rdlength != 0) - LogInfo("FoundStaticHostname: question %##s -> answer %##s (%s)", question->qname.c, answer->rdata->u.name.c, AddRecord ? "ADD" : "RMV"); - else - LogInfo("FoundStaticHostname: question %##s -> answer NULL (%s)", question->qname.c, AddRecord ? "ADD" : "RMV"); - - if (AddRecord && answer->rdlength != 0 && !SameDomainName(pktname, storedname)) - { - AssignDomainName(storedname, pktname); - while (h) - { - if (h->arv4.state == regState_Pending || h->arv4.state == regState_NATMap || h->arv6.state == regState_Pending) - { - // if we're in the process of registering a dynamic hostname, delay SRV update so we don't have to reregister services if the dynamic name succeeds - m->NextSRVUpdate = NonZeroTime(m->timenow + 5 * mDNSPlatformOneSecond); - debugf("FoundStaticHostname: NextSRVUpdate in %d %d", m->NextSRVUpdate - m->timenow, m->timenow); - return; - } - h = h->next; - } - mDNS_Lock(m); - m->NextSRVUpdate = NonZeroTime(m->timenow); - mDNS_Unlock(m); - } - else if (!AddRecord && SameDomainName(pktname, storedname)) - { - mDNS_Lock(m); - storedname->c[0] = 0; - m->NextSRVUpdate = NonZeroTime(m->timenow); - mDNS_Unlock(m); - } - } - -// Called with lock held -mDNSlocal void GetStaticHostname(mDNS *m) - { - char buf[MAX_REVERSE_MAPPING_NAME_V4]; - DNSQuestion *q = &m->ReverseMap; - mDNSu8 *ip = m->AdvertisedV4.ip.v4.b; - mStatus err; - - if (m->ReverseMap.ThisQInterval != -1) return; // already running - if (mDNSIPv4AddressIsZero(m->AdvertisedV4.ip.v4)) return; - - mDNSPlatformMemZero(q, sizeof(*q)); - // Note: This is reverse order compared to a normal dotted-decimal IP address, so we can't use our customary "%.4a" format code - mDNS_snprintf(buf, sizeof(buf), "%d.%d.%d.%d.in-addr.arpa.", ip[3], ip[2], ip[1], ip[0]); - if (!MakeDomainNameFromDNSNameString(&q->qname, buf)) { LogMsg("Error: GetStaticHostname - bad name %s", buf); return; } - - q->InterfaceID = mDNSInterface_Any; - q->Target = zeroAddr; - q->qtype = kDNSType_PTR; - q->qclass = kDNSClass_IN; - q->LongLived = mDNSfalse; - q->ExpectUnique = mDNSfalse; - q->ForceMCast = mDNSfalse; - q->ReturnIntermed = mDNStrue; - q->SuppressUnusable = mDNSfalse; - q->SearchListIndex = 0; - q->AppendSearchDomains = 0; - q->RetryWithSearchDomains = mDNSfalse; - q->TimeoutQuestion = 0; - q->WakeOnResolve = 0; - q->qnameOrig = mDNSNULL; - q->QuestionCallback = FoundStaticHostname; - q->QuestionContext = mDNSNULL; - - LogInfo("GetStaticHostname: %##s (%s)", q->qname.c, DNSTypeName(q->qtype)); - err = mDNS_StartQuery_internal(m, q); - if (err) LogMsg("Error: GetStaticHostname - StartQuery returned error %d", err); - } - -mDNSexport void mDNS_AddDynDNSHostName(mDNS *m, const domainname *fqdn, mDNSRecordCallback *StatusCallback, const void *StatusContext) - { - HostnameInfo **ptr = &m->Hostnames; - - LogInfo("mDNS_AddDynDNSHostName %##s", fqdn); - - while (*ptr && !SameDomainName(fqdn, &(*ptr)->fqdn)) ptr = &(*ptr)->next; - if (*ptr) { LogMsg("DynDNSHostName %##s already in list", fqdn->c); return; } - - // allocate and format new address record - *ptr = mDNSPlatformMemAllocate(sizeof(**ptr)); - if (!*ptr) { LogMsg("ERROR: mDNS_AddDynDNSHostName - malloc"); return; } - - mDNSPlatformMemZero(*ptr, sizeof(**ptr)); - AssignDomainName(&(*ptr)->fqdn, fqdn); - (*ptr)->arv4.state = regState_Unregistered; - (*ptr)->arv6.state = regState_Unregistered; - (*ptr)->StatusCallback = StatusCallback; - (*ptr)->StatusContext = StatusContext; - - AdvertiseHostname(m, *ptr); - } - -mDNSexport void mDNS_RemoveDynDNSHostName(mDNS *m, const domainname *fqdn) - { - HostnameInfo **ptr = &m->Hostnames; - - LogInfo("mDNS_RemoveDynDNSHostName %##s", fqdn); - - while (*ptr && !SameDomainName(fqdn, &(*ptr)->fqdn)) ptr = &(*ptr)->next; - if (!*ptr) LogMsg("mDNS_RemoveDynDNSHostName: no such domainname %##s", fqdn->c); - else - { - HostnameInfo *hi = *ptr; - // We do it this way because, if we have no active v6 record, the "mDNS_Deregister_internal(m, &hi->arv4);" - // below could free the memory, and we have to make sure we don't touch hi fields after that. - mDNSBool f4 = hi->arv4.resrec.RecordType != kDNSRecordTypeUnregistered && hi->arv4.state != regState_Unregistered; - mDNSBool f6 = hi->arv6.resrec.RecordType != kDNSRecordTypeUnregistered && hi->arv6.state != regState_Unregistered; - if (f4) LogInfo("mDNS_RemoveDynDNSHostName removing v4 %##s", fqdn); - if (f6) LogInfo("mDNS_RemoveDynDNSHostName removing v6 %##s", fqdn); - *ptr = (*ptr)->next; // unlink - if (f4) mDNS_Deregister_internal(m, &hi->arv4, mDNS_Dereg_normal); - if (f6) mDNS_Deregister_internal(m, &hi->arv6, mDNS_Dereg_normal); - // When both deregistrations complete we'll free the memory in the mStatus_MemFree callback - } - if (!m->mDNS_busy) LogMsg("mDNS_RemoveDynDNSHostName: ERROR: Lock not held"); - m->NextSRVUpdate = NonZeroTime(m->timenow); - } - -// Currently called without holding the lock -// Maybe we should change that? -mDNSexport void mDNS_SetPrimaryInterfaceInfo(mDNS *m, const mDNSAddr *v4addr, const mDNSAddr *v6addr, const mDNSAddr *router) - { - mDNSBool v4Changed, v6Changed, RouterChanged; - - if (m->mDNS_busy != m->mDNS_reentrancy) - LogMsg("mDNS_SetPrimaryInterfaceInfo: mDNS_busy (%ld) != mDNS_reentrancy (%ld)", m->mDNS_busy, m->mDNS_reentrancy); - - if (v4addr && v4addr->type != mDNSAddrType_IPv4) { LogMsg("mDNS_SetPrimaryInterfaceInfo v4 address - incorrect type. Discarding. %#a", v4addr); return; } - if (v6addr && v6addr->type != mDNSAddrType_IPv6) { LogMsg("mDNS_SetPrimaryInterfaceInfo v6 address - incorrect type. Discarding. %#a", v6addr); return; } - if (router && router->type != mDNSAddrType_IPv4) { LogMsg("mDNS_SetPrimaryInterfaceInfo passed non-v4 router. Discarding. %#a", router); return; } - - mDNS_Lock(m); - - v4Changed = !mDNSSameIPv4Address(m->AdvertisedV4.ip.v4, v4addr ? v4addr->ip.v4 : zerov4Addr); - v6Changed = !mDNSSameIPv6Address(m->AdvertisedV6.ip.v6, v6addr ? v6addr->ip.v6 : zerov6Addr); - RouterChanged = !mDNSSameIPv4Address(m->Router.ip.v4, router ? router->ip.v4 : zerov4Addr); - - if (v4addr && (v4Changed || RouterChanged)) - debugf("mDNS_SetPrimaryInterfaceInfo: address changed from %#a to %#a", &m->AdvertisedV4, v4addr); - - if (v4addr) m->AdvertisedV4 = *v4addr; else m->AdvertisedV4.ip.v4 = zerov4Addr; - if (v6addr) m->AdvertisedV6 = *v6addr; else m->AdvertisedV6.ip.v6 = zerov6Addr; - if (router) m->Router = *router; else m->Router .ip.v4 = zerov4Addr; - // setting router to zero indicates that nat mappings must be reestablished when router is reset - - if (v4Changed || RouterChanged || v6Changed) - { - HostnameInfo *i; - LogInfo("mDNS_SetPrimaryInterfaceInfo: %s%s%s%#a %#a %#a", - v4Changed ? "v4Changed " : "", - RouterChanged ? "RouterChanged " : "", - v6Changed ? "v6Changed " : "", v4addr, v6addr, router); - - for (i = m->Hostnames; i; i = i->next) - { - LogInfo("mDNS_SetPrimaryInterfaceInfo updating host name registrations for %##s", i->fqdn.c); - - if (i->arv4.resrec.RecordType > kDNSRecordTypeDeregistering && - !mDNSSameIPv4Address(i->arv4.resrec.rdata->u.ipv4, m->AdvertisedV4.ip.v4)) - { - LogInfo("mDNS_SetPrimaryInterfaceInfo deregistering %s", ARDisplayString(m, &i->arv4)); - mDNS_Deregister_internal(m, &i->arv4, mDNS_Dereg_normal); - } - - if (i->arv6.resrec.RecordType > kDNSRecordTypeDeregistering && - !mDNSSameIPv6Address(i->arv6.resrec.rdata->u.ipv6, m->AdvertisedV6.ip.v6)) - { - LogInfo("mDNS_SetPrimaryInterfaceInfo deregistering %s", ARDisplayString(m, &i->arv6)); - mDNS_Deregister_internal(m, &i->arv6, mDNS_Dereg_normal); - } - - // AdvertiseHostname will only register new address records. - // For records still in the process of deregistering it will ignore them, and let the mStatus_MemFree callback handle them. - AdvertiseHostname(m, i); - } - - if (v4Changed || RouterChanged) - { - // If we have a non-zero IPv4 address, we should try immediately to see if we have a NAT gateway - // If we have no IPv4 address, we don't want to be in quite such a hurry to report failures to our clients - // Sleeping server sometimes briefly disappears over Back to My Mac after it wakes up - m->ExternalAddress = zerov4Addr; - m->retryIntervalGetAddr = NATMAP_INIT_RETRY; - m->retryGetAddr = m->timenow + (v4addr ? 0 : mDNSPlatformOneSecond * 5); - m->NextScheduledNATOp = m->timenow; - m->LastNATMapResultCode = NATErr_None; -#ifdef _LEGACY_NAT_TRAVERSAL_ - LNT_ClearState(m); -#endif // _LEGACY_NAT_TRAVERSAL_ - LogInfo("mDNS_SetPrimaryInterfaceInfo:%s%s: retryGetAddr in %d %d", - v4Changed ? " v4Changed" : "", - RouterChanged ? " RouterChanged" : "", - m->retryGetAddr - m->timenow, m->timenow); - } - - if (m->ReverseMap.ThisQInterval != -1) mDNS_StopQuery_internal(m, &m->ReverseMap); - m->StaticHostname.c[0] = 0; - - m->NextSRVUpdate = NonZeroTime(m->timenow); - -#if APPLE_OSX_mDNSResponder - if (RouterChanged) uuid_generate(m->asl_uuid); - UpdateAutoTunnelDomainStatuses(m); -#endif - } - - mDNS_Unlock(m); - } - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - Incoming Message Processing -#endif - -mDNSlocal mStatus ParseTSIGError(mDNS *const m, const DNSMessage *const msg, const mDNSu8 *const end, const domainname *const displayname) - { - const mDNSu8 *ptr; - mStatus err = mStatus_NoError; - int i; - - ptr = LocateAdditionals(msg, end); - if (!ptr) goto finish; - - for (i = 0; i < msg->h.numAdditionals; i++) - { - ptr = GetLargeResourceRecord(m, msg, ptr, end, 0, kDNSRecordTypePacketAdd, &m->rec); - if (!ptr) goto finish; - if (m->rec.r.resrec.RecordType != kDNSRecordTypePacketNegative && m->rec.r.resrec.rrtype == kDNSType_TSIG) - { - mDNSu32 macsize; - mDNSu8 *rd = m->rec.r.resrec.rdata->u.data; - mDNSu8 *rdend = rd + m->rec.r.resrec.rdlength; - int alglen = DomainNameLengthLimit(&m->rec.r.resrec.rdata->u.name, rdend); - if (alglen > MAX_DOMAIN_NAME) goto finish; - rd += alglen; // algorithm name - if (rd + 6 > rdend) goto finish; - rd += 6; // 48-bit timestamp - if (rd + sizeof(mDNSOpaque16) > rdend) goto finish; - rd += sizeof(mDNSOpaque16); // fudge - if (rd + sizeof(mDNSOpaque16) > rdend) goto finish; - macsize = mDNSVal16(*(mDNSOpaque16 *)rd); - rd += sizeof(mDNSOpaque16); // MAC size - if (rd + macsize > rdend) goto finish; - rd += macsize; - if (rd + sizeof(mDNSOpaque16) > rdend) goto finish; - rd += sizeof(mDNSOpaque16); // orig id - if (rd + sizeof(mDNSOpaque16) > rdend) goto finish; - err = mDNSVal16(*(mDNSOpaque16 *)rd); // error code - - if (err == TSIG_ErrBadSig) { LogMsg("%##s: bad signature", displayname->c); err = mStatus_BadSig; } - else if (err == TSIG_ErrBadKey) { LogMsg("%##s: bad key", displayname->c); err = mStatus_BadKey; } - else if (err == TSIG_ErrBadTime) { LogMsg("%##s: bad time", displayname->c); err = mStatus_BadTime; } - else if (err) { LogMsg("%##s: unknown tsig error %d", displayname->c, err); err = mStatus_UnknownErr; } - goto finish; - } - m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it - } - - finish: - m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it - return err; - } - -mDNSlocal mStatus checkUpdateResult(mDNS *const m, const domainname *const displayname, const mDNSu8 rcode, const DNSMessage *const msg, const mDNSu8 *const end) - { - (void)msg; // currently unused, needed for TSIG errors - if (!rcode) return mStatus_NoError; - else if (rcode == kDNSFlag1_RC_YXDomain) - { - debugf("name in use: %##s", displayname->c); - return mStatus_NameConflict; - } - else if (rcode == kDNSFlag1_RC_Refused) - { - LogMsg("Update %##s refused", displayname->c); - return mStatus_Refused; - } - else if (rcode == kDNSFlag1_RC_NXRRSet) - { - LogMsg("Reregister refused (NXRRSET): %##s", displayname->c); - return mStatus_NoSuchRecord; - } - else if (rcode == kDNSFlag1_RC_NotAuth) - { - // TSIG errors should come with FormErr as per RFC 2845, but BIND 9 sends them with NotAuth so we look here too - mStatus tsigerr = ParseTSIGError(m, msg, end, displayname); - if (!tsigerr) - { - LogMsg("Permission denied (NOAUTH): %##s", displayname->c); - return mStatus_UnknownErr; - } - else return tsigerr; - } - else if (rcode == kDNSFlag1_RC_FormErr) - { - mStatus tsigerr = ParseTSIGError(m, msg, end, displayname); - if (!tsigerr) - { - LogMsg("Format Error: %##s", displayname->c); - return mStatus_UnknownErr; - } - else return tsigerr; - } - else - { - LogMsg("Update %##s failed with rcode %d", displayname->c, rcode); - return mStatus_UnknownErr; - } - } - -// We add three Additional Records for unicast resource record registrations -// which is a function of AuthInfo and AutoTunnel properties -mDNSlocal mDNSu32 RRAdditionalSize(mDNS *const m, DomainAuthInfo *AuthInfo) - { - mDNSu32 leaseSize, hinfoSize, tsigSize; - mDNSu32 rr_base_size = 10; // type (2) class (2) TTL (4) rdlength (2) - - // OPT RR : Emptyname(.) + base size + rdataOPT - leaseSize = 1 + rr_base_size + sizeof(rdataOPT); - - // HINFO: Resource Record Name + base size + RDATA - // HINFO is added only for autotunnels - hinfoSize = 0; - if (AuthInfo && AuthInfo->AutoTunnel) - hinfoSize = (m->hostlabel.c[0] + 1) + DomainNameLength(&AuthInfo->domain) + - rr_base_size + (2 + m->HIHardware.c[0] + m->HISoftware.c[0]); - - //TSIG: Resource Record Name + base size + RDATA - // RDATA: - // Algorithm name: hmac-md5.sig-alg.reg.int (8+7+3+3 + 5 bytes for length = 26 bytes) - // Time: 6 bytes - // Fudge: 2 bytes - // Mac Size: 2 bytes - // Mac: 16 bytes - // ID: 2 bytes - // Error: 2 bytes - // Len: 2 bytes - // Total: 58 bytes - tsigSize = 0; - if (AuthInfo) tsigSize = DomainNameLength(&AuthInfo->keyname) + rr_base_size + 58; - - return (leaseSize + hinfoSize + tsigSize); - } - -//Note: Make sure that RREstimatedSize is updated accordingly if anything that is done here -//would modify rdlength/rdestimate -mDNSlocal mDNSu8* BuildUpdateMessage(mDNS *const m, mDNSu8 *ptr, AuthRecord *rr, mDNSu8 *limit) - { - //If this record is deregistering, then just send the deletion record - if (rr->state == regState_DeregPending) - { - rr->expire = 0; // Indicate that we have no active registration any more - ptr = putDeletionRecordWithLimit(&m->omsg, ptr, &rr->resrec, limit); - if (!ptr) goto exit; - return ptr; - } - - // This is a common function to both sending an update in a group or individual - // records separately. Hence, we change the state here. - if (rr->state == regState_Registered) rr->state = regState_Refresh; - if (rr->state != regState_Refresh && rr->state != regState_UpdatePending) - rr->state = regState_Pending; - - // For Advisory records like e.g., _services._dns-sd, which is shared, don't send goodbyes as multiple - // host might be registering records and deregistering from one does not make sense - if (rr->resrec.RecordType != kDNSRecordTypeAdvisory) rr->RequireGoodbye = mDNStrue; - - if ((rr->resrec.rrtype == kDNSType_SRV) && (rr->AutoTarget == Target_AutoHostAndNATMAP) && - !mDNSIPPortIsZero(rr->NATinfo.ExternalPort)) - { - rr->resrec.rdata->u.srv.port = rr->NATinfo.ExternalPort; - } - - if (rr->state == regState_UpdatePending) - { - // delete old RData - SetNewRData(&rr->resrec, rr->OrigRData, rr->OrigRDLen); - if (!(ptr = putDeletionRecordWithLimit(&m->omsg, ptr, &rr->resrec, limit))) goto exit; // delete old rdata - - // add new RData - SetNewRData(&rr->resrec, rr->InFlightRData, rr->InFlightRDLen); - if (!(ptr = PutResourceRecordTTLWithLimit(&m->omsg, ptr, &m->omsg.h.mDNS_numUpdates, &rr->resrec, rr->resrec.rroriginalttl, limit))) goto exit; - } - else - { - if (rr->resrec.RecordType == kDNSRecordTypeKnownUnique || rr->resrec.RecordType == kDNSRecordTypeVerified) - { - // KnownUnique : Delete any previous value - // For Unicast registrations, we don't verify that it is unique, but set to verified and hence we want to - // delete any previous value - ptr = putDeleteRRSetWithLimit(&m->omsg, ptr, rr->resrec.name, rr->resrec.rrtype, limit); - if (!ptr) goto exit; - } - else if (rr->resrec.RecordType != kDNSRecordTypeShared) - { - // For now don't do this, until we have the logic for intelligent grouping of individual records into logical service record sets - //ptr = putPrereqNameNotInUse(rr->resrec.name, &m->omsg, ptr, end); - if (!ptr) goto exit; - } - - ptr = PutResourceRecordTTLWithLimit(&m->omsg, ptr, &m->omsg.h.mDNS_numUpdates, &rr->resrec, rr->resrec.rroriginalttl, limit); - if (!ptr) goto exit; - } - - return ptr; -exit: - LogMsg("BuildUpdateMessage: Error formatting message for %s", ARDisplayString(m, rr)); - return mDNSNULL; - } - -// Called with lock held -mDNSlocal void SendRecordRegistration(mDNS *const m, AuthRecord *rr) - { - mDNSu8 *ptr = m->omsg.data; - mStatus err = mStatus_UnknownErr; - mDNSu8 *limit; - DomainAuthInfo *AuthInfo; - - // For the ability to register large TXT records, we limit the single record registrations - // to AbsoluteMaxDNSMessageData - limit = ptr + AbsoluteMaxDNSMessageData; - - AuthInfo = GetAuthInfoForName_internal(m, rr->resrec.name); - limit -= RRAdditionalSize(m, AuthInfo); - - if (m->mDNS_busy != m->mDNS_reentrancy+1) - LogMsg("SendRecordRegistration: Lock not held! mDNS_busy (%ld) mDNS_reentrancy (%ld)", m->mDNS_busy, m->mDNS_reentrancy); - - if (!rr->nta || mDNSIPv4AddressIsZero(rr->nta->Addr.ip.v4)) - { - // We never call this function when there is no zone information . Log a message if it ever happens. - LogMsg("SendRecordRegistration: No Zone information, should not happen %s", ARDisplayString(m, rr)); - return; - } - - rr->updateid = mDNS_NewMessageID(m); - InitializeDNSMessage(&m->omsg.h, rr->updateid, UpdateReqFlags); - - // set zone - ptr = putZone(&m->omsg, ptr, limit, rr->zone, mDNSOpaque16fromIntVal(rr->resrec.rrclass)); - if (!ptr) goto exit; - - if (!(ptr = BuildUpdateMessage(m, ptr, rr, limit))) goto exit; - - if (rr->uselease) - { - ptr = putUpdateLeaseWithLimit(&m->omsg, ptr, DEFAULT_UPDATE_LEASE, limit); - if (!ptr) goto exit; - } - if (rr->Private) - { - LogInfo("SendRecordRegistration TCP %p %s", rr->tcp, ARDisplayString(m, rr)); - if (rr->tcp) LogInfo("SendRecordRegistration: Disposing existing TCP connection for %s", ARDisplayString(m, rr)); - if (rr->tcp) { DisposeTCPConn(rr->tcp); rr->tcp = mDNSNULL; } - if (!rr->nta) { LogMsg("SendRecordRegistration:Private:ERROR!! nta is NULL for %s", ARDisplayString(m, rr)); return; } - rr->tcp = MakeTCPConn(m, &m->omsg, ptr, kTCPSocketFlags_UseTLS, &rr->nta->Addr, rr->nta->Port, &rr->nta->Host, mDNSNULL, rr); - } - else - { - LogInfo("SendRecordRegistration UDP %s", ARDisplayString(m, rr)); - if (!rr->nta) { LogMsg("SendRecordRegistration:ERROR!! nta is NULL for %s", ARDisplayString(m, rr)); return; } - err = mDNSSendDNSMessage(m, &m->omsg, ptr, mDNSInterface_Any, mDNSNULL, &rr->nta->Addr, rr->nta->Port, mDNSNULL, GetAuthInfoForName_internal(m, rr->resrec.name)); - if (err) debugf("ERROR: SendRecordRegistration - mDNSSendDNSMessage - %d", err); - } - - SetRecordRetry(m, rr, 0); - return; -exit: - LogMsg("SendRecordRegistration: Error formatting message for %s, disabling further updates", ARDisplayString(m, rr)); - // Disable this record from future updates - rr->state = regState_NoTarget; - } - -// Is the given record "rr" eligible for merging ? -mDNSlocal mDNSBool IsRecordMergeable(mDNS *const m, AuthRecord *rr, mDNSs32 time) - { - DomainAuthInfo *info; - (void) m; //unused - // A record is eligible for merge, if the following properties are met. - // - // 1. uDNS Resource Record - // 2. It is time to send them now - // 3. It is in proper state - // 4. Update zone has been resolved - // 5. if DomainAuthInfo exists for the zone, it should not be soon deleted - // 6. Zone information is present - // 7. Update server is not zero - // 8. It has a non-null zone - // 9. It uses a lease option - // 10. DontMerge is not set - // - // Following code is implemented as separate "if" statements instead of one "if" statement - // is for better debugging purposes e.g., we know exactly what failed if debugging turned on. - - if (!AuthRecord_uDNS(rr)) return mDNSfalse; - - if (rr->LastAPTime + rr->ThisAPInterval - time > 0) - { debugf("IsRecordMergeable: Time %d not reached for %s", rr->LastAPTime + rr->ThisAPInterval - m->timenow, ARDisplayString(m, rr)); return mDNSfalse; } - - if (!rr->zone) return mDNSfalse; - - info = GetAuthInfoForName_internal(m, rr->zone); - - if (info && info->deltime && m->timenow - info->deltime >= 0) {debugf("IsRecordMergeable: Domain %##s will be deleted soon", info->domain.c); return mDNSfalse;} - - if (rr->state != regState_DeregPending && rr->state != regState_Pending && rr->state != regState_Registered && rr->state != regState_Refresh && rr->state != regState_UpdatePending) - { debugf("IsRecordMergeable: state %d not right %s", rr->state, ARDisplayString(m, rr)); return mDNSfalse; } - - if (!rr->nta || mDNSIPv4AddressIsZero(rr->nta->Addr.ip.v4)) return mDNSfalse; - - if (!rr->uselease) return mDNSfalse; - - if (rr->mState == mergeState_DontMerge) {debugf("IsRecordMergeable Dontmerge true %s", ARDisplayString(m, rr));return mDNSfalse;} - debugf("IsRecordMergeable: Returning true for %s", ARDisplayString(m, rr)); - return mDNStrue; - } - -// Is the resource record "rr" eligible to merge to with "currentRR" ? -mDNSlocal mDNSBool AreRecordsMergeable(mDNS *const m, AuthRecord *currentRR, AuthRecord *rr, mDNSs32 time) - { - // A record is eligible to merge with another record as long it is eligible for merge in itself - // and it has the same zone information as the other record - if (!IsRecordMergeable(m, rr, time)) return mDNSfalse; - - if (!SameDomainName(currentRR->zone, rr->zone)) - { debugf("AreRecordMergeable zone mismatch current rr Zone %##s, rr zone %##s", currentRR->zone->c, rr->zone->c); return mDNSfalse; } - - if (!mDNSSameIPv4Address(currentRR->nta->Addr.ip.v4, rr->nta->Addr.ip.v4)) return mDNSfalse; - - if (!mDNSSameIPPort(currentRR->nta->Port, rr->nta->Port)) return mDNSfalse; - - debugf("AreRecordsMergeable: Returning true for %s", ARDisplayString(m, rr)); - return mDNStrue; - } - -// If we can't build the message successfully because of problems in pre-computing -// the space, we disable merging for all the current records -mDNSlocal void RRMergeFailure(mDNS *const m) - { - AuthRecord *rr; - for (rr = m->ResourceRecords; rr; rr = rr->next) - { - rr->mState = mergeState_DontMerge; - rr->SendRNow = mDNSNULL; - // Restarting the registration is much simpler than saving and restoring - // the exact time - ActivateUnicastRegistration(m, rr); - } - } - -mDNSlocal void SendGroupRRMessage(mDNS *const m, AuthRecord *anchorRR, mDNSu8 *ptr, DomainAuthInfo *info) - { - mDNSu8 *limit; - if (!anchorRR) {debugf("SendGroupRRMessage: Could not merge records"); return;} - - if (info && info->AutoTunnel) limit = m->omsg.data + AbsoluteMaxDNSMessageData; - else limit = m->omsg.data + NormalMaxDNSMessageData; - - // This has to go in the additional section and hence need to be done last - ptr = putUpdateLeaseWithLimit(&m->omsg, ptr, DEFAULT_UPDATE_LEASE, limit); - if (!ptr) - { - LogMsg("SendGroupRRMessage: ERROR: Could not put lease option, failing the group registration"); - // if we can't put the lease, we need to undo the merge - RRMergeFailure(m); - return; - } - if (anchorRR->Private) - { - if (anchorRR->tcp) debugf("SendGroupRRMessage: Disposing existing TCP connection for %s", ARDisplayString(m, anchorRR)); - if (anchorRR->tcp) { DisposeTCPConn(anchorRR->tcp); anchorRR->tcp = mDNSNULL; } - if (!anchorRR->nta) { LogMsg("SendGroupRRMessage:ERROR!! nta is NULL for %s", ARDisplayString(m, anchorRR)); return; } - anchorRR->tcp = MakeTCPConn(m, &m->omsg, ptr, kTCPSocketFlags_UseTLS, &anchorRR->nta->Addr, anchorRR->nta->Port, &anchorRR->nta->Host, mDNSNULL, anchorRR); - if (!anchorRR->tcp) LogInfo("SendGroupRRMessage: Cannot establish TCP connection for %s", ARDisplayString(m, anchorRR)); - else LogInfo("SendGroupRRMessage: Sent a group update ID: %d start %p, end %p, limit %p", mDNSVal16(m->omsg.h.id), m->omsg.data, ptr, limit); - } - else - { - mStatus err = mDNSSendDNSMessage(m, &m->omsg, ptr, mDNSInterface_Any, mDNSNULL, &anchorRR->nta->Addr, anchorRR->nta->Port, mDNSNULL, info); - if (err) LogInfo("SendGroupRRMessage: Cannot send UDP message for %s", ARDisplayString(m, anchorRR)); - else LogInfo("SendGroupRRMessage: Sent a group UDP update ID: %d start %p, end %p, limit %p", mDNSVal16(m->omsg.h.id), m->omsg.data, ptr, limit); - } - return; - } - -// As we always include the zone information and the resource records contain zone name -// at the end, it will get compressed. Hence, we subtract zoneSize and add two bytes for -// the compression pointer -mDNSlocal mDNSu32 RREstimatedSize(AuthRecord *rr, int zoneSize) - { - int rdlength; - - // Note: Estimation of the record size has to mirror the logic in BuildUpdateMessage, otherwise estimation - // would be wrong. Currently BuildUpdateMessage calls SetNewRData in UpdatePending case. Hence, we need - // to account for that here. Otherwise, we might under estimate the size. - if (rr->state == regState_UpdatePending) - // old RData that will be deleted - // new RData that will be added - rdlength = rr->OrigRDLen + rr->InFlightRDLen; - else - rdlength = rr->resrec.rdestimate; - - if (rr->state == regState_DeregPending) - { - debugf("RREstimatedSize: ResourceRecord %##s (%s), DomainNameLength %d, zoneSize %d, rdestimate %d", - rr->resrec.name->c, DNSTypeName(rr->resrec.rrtype), DomainNameLength(rr->resrec.name), zoneSize, rdlength); - return DomainNameLength(rr->resrec.name) - zoneSize + 2 + 10 + rdlength; - } - - // For SRV, TXT, AAAA etc. that are Unique/Verified, we also send a Deletion Record - if (rr->resrec.RecordType == kDNSRecordTypeKnownUnique || rr->resrec.RecordType == kDNSRecordTypeVerified) - { - // Deletion Record: Resource Record Name + Base size (10) + 0 - // Record: Resource Record Name (Compressed = 2) + Base size (10) + rdestimate - - debugf("RREstimatedSize: ResourceRecord %##s (%s), DomainNameLength %d, zoneSize %d, rdestimate %d", - rr->resrec.name->c, DNSTypeName(rr->resrec.rrtype), DomainNameLength(rr->resrec.name), zoneSize, rdlength); - return DomainNameLength(rr->resrec.name) - zoneSize + 2 + 10 + 2 + 10 + rdlength; - } - else - { - return DomainNameLength(rr->resrec.name) - zoneSize + 2 + 10 + rdlength; - } - } - -mDNSlocal AuthRecord *MarkRRForSending(mDNS *const m) - { - AuthRecord *rr; - AuthRecord *firstRR = mDNSNULL; - - // Look for records that needs to be sent in the next two seconds (MERGE_DELAY_TIME is set to 1 second). - // The logic is as follows. - // - // 1. Record 1 finishes getting zone data and its registration gets delayed by 1 second - // 2. Record 2 comes 0.1 second later, finishes getting its zone data and its registration is also delayed by - // 1 second which is now scheduled at 1.1 second - // - // By looking for 1 second into the future (m->timenow + MERGE_DELAY_TIME below does that) we have merged both - // of the above records. Note that we can't look for records too much into the future as this will affect the - // retry logic. The first retry is scheduled at 3 seconds. Hence, we should always look smaller than that. - // Anything more than one second will affect the first retry to happen sooner. - // - // Note: As a side effect of looking one second into the future to facilitate merging, the retries happen - // one second sooner. - for (rr = m->ResourceRecords; rr; rr = rr->next) - { - if (!firstRR) - { - if (!IsRecordMergeable(m, rr, m->timenow + MERGE_DELAY_TIME)) continue; - firstRR = rr; - } - else if (!AreRecordsMergeable(m, firstRR, rr, m->timenow + MERGE_DELAY_TIME)) continue; - - if (rr->SendRNow) LogMsg("MarkRRForSending: Resourcerecord %s already marked for sending", ARDisplayString(m, rr)); - rr->SendRNow = mDNSInterfaceMark; - } - - // We parsed through all records and found something to send. The services/records might - // get registered at different times but we want the refreshes to be all merged and sent - // as one update. Hence, we accelerate some of the records so that they will sync up in - // the future. Look at the records excluding the ones that we have already sent in the - // previous pass. If it half way through its scheduled refresh/retransmit, merge them - // into this packet. - // - // Note that we only look at Registered/Refresh state to keep it simple. As we don't know - // whether the current update will fit into one or more packets, merging a resource record - // (which is in a different state) that has been scheduled for retransmit would trigger - // sending more packets. - if (firstRR) - { - int acc = 0; - for (rr = m->ResourceRecords; rr; rr = rr->next) - { - if ((rr->state != regState_Registered && rr->state != regState_Refresh) || - (rr->SendRNow == mDNSInterfaceMark) || - (!AreRecordsMergeable(m, firstRR, rr, m->timenow + rr->ThisAPInterval/2))) - continue; - rr->SendRNow = mDNSInterfaceMark; - acc++; - } - if (acc) LogInfo("MarkRRForSending: Accelereated %d records", acc); - } - return firstRR; - } - -mDNSlocal mDNSBool SendGroupUpdates(mDNS *const m) - { - mDNSOpaque16 msgid; - mDNSs32 spaceleft = 0; - mDNSs32 zoneSize, rrSize; - mDNSu8 *oldnext; // for debugging - mDNSu8 *next = m->omsg.data; - AuthRecord *rr; - AuthRecord *anchorRR = mDNSNULL; - int nrecords = 0; - AuthRecord *startRR = m->ResourceRecords; - mDNSu8 *limit = mDNSNULL; - DomainAuthInfo *AuthInfo = mDNSNULL; - mDNSBool sentallRecords = mDNStrue; - - - // We try to fit as many ResourceRecords as possible in AbsoluteNormal/MaxDNSMessageData. Before we start - // putting in resource records, we need to reserve space for a few things. Every group/packet should - // have the following. - // - // 1) Needs space for the Zone information (which needs to be at the beginning) - // 2) Additional section MUST have space for lease option, HINFO and TSIG option (which needs to - // to be at the end) - // - // In future we need to reserve space for the pre-requisites which also goes at the beginning. - // To accomodate pre-requisites in the future, first we walk the whole list marking records - // that can be sent in this packet and computing the space needed for these records. - // For TXT and SRV records, we delete the previous record if any by sending the same - // resource record with ANY RDATA and zero rdlen. Hence, we need to have space for both of them. - - while (startRR) - { - AuthInfo = mDNSNULL; - anchorRR = mDNSNULL; - nrecords = 0; - zoneSize = 0; - for (rr = startRR; rr; rr = rr->next) - { - if (rr->SendRNow != mDNSInterfaceMark) continue; - - rr->SendRNow = mDNSNULL; - - if (!anchorRR) - { - AuthInfo = GetAuthInfoForName_internal(m, rr->zone); - - // Though we allow single record registrations for UDP to be AbsoluteMaxDNSMessageData (See - // SendRecordRegistration) to handle large TXT records, to avoid fragmentation we limit UDP - // message to NormalMaxDNSMessageData - if (AuthInfo && AuthInfo->AutoTunnel) spaceleft = AbsoluteMaxDNSMessageData; - else spaceleft = NormalMaxDNSMessageData; - - next = m->omsg.data; - spaceleft -= RRAdditionalSize(m, AuthInfo); - if (spaceleft <= 0) - { - LogMsg("SendGroupUpdates: ERROR!!: spaceleft is zero at the beginning"); - RRMergeFailure(m); - return mDNSfalse; - } - limit = next + spaceleft; - - // Build the initial part of message before putting in the other records - msgid = mDNS_NewMessageID(m); - InitializeDNSMessage(&m->omsg.h, msgid, UpdateReqFlags); - - // We need zone information at the beginning of the packet. Length: ZNAME, ZTYPE(2), ZCLASS(2) - // zone has to be non-NULL for a record to be mergeable, hence it is safe to set/ examine zone - //without checking for NULL. - zoneSize = DomainNameLength(rr->zone) + 4; - spaceleft -= zoneSize; - if (spaceleft <= 0) - { - LogMsg("SendGroupUpdates: ERROR no space for zone information, disabling merge"); - RRMergeFailure(m); - return mDNSfalse; - } - next = putZone(&m->omsg, next, limit, rr->zone, mDNSOpaque16fromIntVal(rr->resrec.rrclass)); - if (!next) - { - LogMsg("SendGroupUpdates: ERROR! Cannot put zone, disabling merge"); - RRMergeFailure(m); - return mDNSfalse; - } - anchorRR = rr; - } - - rrSize = RREstimatedSize(rr, zoneSize - 4); - - if ((spaceleft - rrSize) < 0) - { - // If we can't fit even a single message, skip it, it will be sent separately - // in CheckRecordUpdates - if (!nrecords) - { - LogInfo("SendGroupUpdates: Skipping message %s, spaceleft %d, rrSize %d", ARDisplayString(m, rr), spaceleft, rrSize); - // Mark this as not sent so that the caller knows about it - rr->SendRNow = mDNSInterfaceMark; - // We need to remove the merge delay so that we can send it immediately - rr->ThisAPInterval = INIT_RECORD_REG_INTERVAL; - rr->LastAPTime = m->timenow - INIT_RECORD_REG_INTERVAL; - rr = rr->next; - anchorRR = mDNSNULL; - sentallRecords = mDNSfalse; - } - else - { - LogInfo("SendGroupUpdates:1: Parsed %d records and sending using %s, spaceleft %d, rrSize %d", nrecords, ARDisplayString(m, anchorRR), spaceleft, rrSize); - SendGroupRRMessage(m, anchorRR, next, AuthInfo); - } - break; // breaks out of for loop - } - spaceleft -= rrSize; - oldnext = next; - LogInfo("SendGroupUpdates: Building a message with resource record %s, next %p, state %d, ttl %d", ARDisplayString(m, rr), next, rr->state, rr->resrec.rroriginalttl); - if (!(next = BuildUpdateMessage(m, next, rr, limit))) - { - // We calculated the space and if we can't fit in, we had some bug in the calculation, - // disable merge completely. - LogMsg("SendGroupUpdates: ptr NULL while building message with %s", ARDisplayString(m, rr)); - RRMergeFailure(m); - return mDNSfalse; - } - // If our estimate was higher, adjust to the actual size - if ((next - oldnext) > rrSize) - LogMsg("SendGroupUpdates: ERROR!! Record size estimation is wrong for %s, Estimate %d, Actual %d, state %d", ARDisplayString(m, rr), rrSize, next - oldnext, rr->state); - else { spaceleft += rrSize; spaceleft -= (next - oldnext); } - - nrecords++; - // We could have sent an update earlier with this "rr" as anchorRR for which we never got a response. - // To preserve ordering, we blow away the previous connection before sending this. - if (rr->tcp) { DisposeTCPConn(rr->tcp); rr->tcp = mDNSNULL;} - rr->updateid = msgid; - - // By setting the retry time interval here, we will not be looking at these records - // again when we return to CheckGroupRecordUpdates. - SetRecordRetry(m, rr, 0); - } - // Either we have parsed all the records or stopped at "rr" above due to lack of space - startRR = rr; - } - - if (anchorRR) - { - LogInfo("SendGroupUpdates: Parsed %d records and sending using %s", nrecords, ARDisplayString(m, anchorRR)); - SendGroupRRMessage(m, anchorRR, next, AuthInfo); - } - return sentallRecords; - } - -// Merge the record registrations and send them as a group only if they -// have same DomainAuthInfo and hence the same key to put the TSIG -mDNSlocal void CheckGroupRecordUpdates(mDNS *const m) - { - AuthRecord *rr, *nextRR; - // Keep sending as long as there is at least one record to be sent - while (MarkRRForSending(m)) - { - if (!SendGroupUpdates(m)) - { - // if everything that was marked was not sent, send them out individually - for (rr = m->ResourceRecords; rr; rr = nextRR) - { - // SendRecordRegistrtion might delete the rr from list, hence - // dereference nextRR before calling the function - nextRR = rr->next; - if (rr->SendRNow == mDNSInterfaceMark) - { - // Any records marked for sending should be eligible to be sent out - // immediately. Just being cautious - if (rr->LastAPTime + rr->ThisAPInterval - m->timenow > 0) - { LogMsg("CheckGroupRecordUpdates: ERROR!! Resourcerecord %s not ready", ARDisplayString(m, rr)); continue; } - rr->SendRNow = mDNSNULL; - SendRecordRegistration(m, rr); - } - } - } - } - - debugf("CheckGroupRecordUpdates: No work, returning"); - return; - } - -mDNSlocal void hndlSRVChanged(mDNS *const m, AuthRecord *rr) - { - // Reevaluate the target always as NAT/Target could have changed while - // we were registering/deeregistering - domainname *dt; - const domainname *target = GetServiceTarget(m, rr); - if (!target || target->c[0] == 0) - { - // we don't have a target, if we just derregistered, then we don't have to do anything - if (rr->state == regState_DeregPending) - { - LogInfo("hndlSRVChanged: SRVChanged, No Target, SRV Deregistered for %##s, state %d", rr->resrec.name->c, - rr->state); - rr->SRVChanged = mDNSfalse; - dt = GetRRDomainNameTarget(&rr->resrec); - if (dt) dt->c[0] = 0; - rr->state = regState_NoTarget; // Wait for the next target change - rr->resrec.rdlength = rr->resrec.rdestimate = 0; - return; - } - - // we don't have a target, if we just registered, we need to deregister - if (rr->state == regState_Pending) - { - LogInfo("hndlSRVChanged: SRVChanged, No Target, Deregistering again %##s, state %d", rr->resrec.name->c, rr->state); - rr->ThisAPInterval = INIT_RECORD_REG_INTERVAL; - rr->LastAPTime = m->timenow - INIT_RECORD_REG_INTERVAL; - rr->state = regState_DeregPending; - return; - } - LogInfo("hndlSRVChanged: Not in DeregPending or RegPending state %##s, state %d", rr->resrec.name->c, rr->state); - } - else - { - // If we were in registered state and SRV changed to NULL, we deregister and come back here - // if we have a target, we need to register again. - // - // if we just registered check to see if it is same. If it is different just re-register the - // SRV and its assoicated records - // - // UpdateOneSRVRecord takes care of re-registering all service records - if ((rr->state == regState_DeregPending) || - (rr->state == regState_Pending && !SameDomainName(target, &rr->resrec.rdata->u.srv.target))) - { - dt = GetRRDomainNameTarget(&rr->resrec); - if (dt) dt->c[0] = 0; - rr->state = regState_NoTarget; // NoTarget will allow us to pick up new target OR nat traversal state - rr->resrec.rdlength = rr->resrec.rdestimate = 0; - LogInfo("hndlSRVChanged: SRVChanged, Valid Target %##s, Registering all records for %##s, state %d", - target->c, rr->resrec.name->c, rr->state); - rr->SRVChanged = mDNSfalse; - UpdateOneSRVRecord(m, rr); - return; - } - // Target did not change while this record was registering. Hence, we go to - // Registered state - the state we started from. - if (rr->state == regState_Pending) rr->state = regState_Registered; - } - - rr->SRVChanged = mDNSfalse; - } - -// Called with lock held -mDNSlocal void hndlRecordUpdateReply(mDNS *m, AuthRecord *rr, mStatus err, mDNSu32 random) - { - mDNSBool InvokeCallback = mDNStrue; - mDNSIPPort UpdatePort = zeroIPPort; - - if (m->mDNS_busy != m->mDNS_reentrancy+1) - LogMsg("hndlRecordUpdateReply: Lock not held! mDNS_busy (%ld) mDNS_reentrancy (%ld)", m->mDNS_busy, m->mDNS_reentrancy); - - LogInfo("hndlRecordUpdateReply: err %d ID %d state %d %s(%p)", err, mDNSVal16(rr->updateid), rr->state, ARDisplayString(m, rr), rr); - - rr->updateError = err; -#if APPLE_OSX_mDNSResponder - if (err == mStatus_BadSig) UpdateAutoTunnelDomainStatuses(m); -#endif - - SetRecordRetry(m, rr, random); - - rr->updateid = zeroID; // Make sure that this is not considered as part of a group anymore - // Later when need to send an update, we will get the zone data again. Thus we avoid - // using stale information. - // - // Note: By clearing out the zone info here, it also helps better merging of records - // in some cases. For example, when we get out regState_NoTarget state e.g., move out - // of Double NAT, we want all the records to be in one update. Some BTMM records like - // _autotunnel6 and host records are registered/deregistered when NAT state changes. - // As they are re-registered the zone information is cleared out. To merge with other - // records that might be possibly going out, clearing out the information here helps - // as all of them try to get the zone data. - if (rr->nta) - { - // We always expect the question to be stopped when we get a valid response from the server. - // If the zone info tries to change during this time, updateid would be different and hence - // this response should not have been accepted. - if (rr->nta->question.ThisQInterval != -1) - LogMsg("hndlRecordUpdateReply: ResourceRecord %s, zone info question %##s (%s) interval %d not -1", - ARDisplayString(m, rr), rr->nta->question.qname.c, DNSTypeName(rr->nta->question.qtype), rr->nta->question.ThisQInterval); - UpdatePort = rr->nta->Port; - CancelGetZoneData(m, rr->nta); - rr->nta = mDNSNULL; - } - - // If we are deregistering the record, then complete the deregistration. Ignore any NAT/SRV change - // that could have happened during that time. - if (rr->resrec.RecordType == kDNSRecordTypeDeregistering && rr->state == regState_DeregPending) - { - debugf("hndlRecordUpdateReply: Received reply for deregister record %##s type %d", rr->resrec.name->c, rr->resrec.rrtype); - if (err) LogMsg("ERROR: Deregistration of record %##s type %d failed with error %d", - rr->resrec.name->c, rr->resrec.rrtype, err); - rr->state = regState_Unregistered; - CompleteDeregistration(m, rr); - return; - } - - // We are returning early without updating the state. When we come back from sleep we will re-register after - // re-initializing all the state as though it is a first registration. If the record can't be registered e.g., - // no target, it will be deregistered. Hence, the updating to the right state should not matter when going - // to sleep. - if (m->SleepState) - { - // Need to set it to NoTarget state so that RecordReadyForSleep knows that - // we are done - if (rr->resrec.rrtype == kDNSType_SRV && rr->state == regState_DeregPending) - rr->state = regState_NoTarget; - return; - } - - if (rr->state == regState_UpdatePending) - { - if (err) LogMsg("Update record failed for %##s (err %d)", rr->resrec.name->c, err); - rr->state = regState_Registered; - // deallocate old RData - if (rr->UpdateCallback) rr->UpdateCallback(m, rr, rr->OrigRData, rr->OrigRDLen); - SetNewRData(&rr->resrec, rr->InFlightRData, rr->InFlightRDLen); - rr->OrigRData = mDNSNULL; - rr->InFlightRData = mDNSNULL; - } - - if (rr->SRVChanged) - { - if (rr->resrec.rrtype == kDNSType_SRV) - hndlSRVChanged(m, rr); - else - { - LogInfo("hndlRecordUpdateReply: Deregistered %##s (%s), state %d", rr->resrec.name->c, DNSTypeName(rr->resrec.rrtype), rr->state); - rr->SRVChanged = mDNSfalse; - if (rr->state != regState_DeregPending) LogMsg("hndlRecordUpdateReply: ResourceRecord %s not in DeregPending state %d", ARDisplayString(m, rr), rr->state); - rr->state = regState_NoTarget; // Wait for the next target change - } - return; - } - - if (rr->state == regState_Pending || rr->state == regState_Refresh) - { - if (!err) - { - if (rr->state == regState_Refresh) InvokeCallback = mDNSfalse; - rr->state = regState_Registered; - } - else - { - // Retry without lease only for non-Private domains - LogMsg("hndlRecordUpdateReply: Registration of record %##s type %d failed with error %d", rr->resrec.name->c, rr->resrec.rrtype, err); - if (!rr->Private && rr->uselease && err == mStatus_UnknownErr && mDNSSameIPPort(UpdatePort, UnicastDNSPort)) - { - LogMsg("hndlRecordUpdateReply: Will retry update of record %##s without lease option", rr->resrec.name->c); - rr->uselease = mDNSfalse; - rr->ThisAPInterval = INIT_RECORD_REG_INTERVAL; - rr->LastAPTime = m->timenow - INIT_RECORD_REG_INTERVAL; - return; - } - // Communicate the error to the application in the callback below - } - } - - if (rr->QueuedRData && rr->state == regState_Registered) - { - rr->state = regState_UpdatePending; - rr->InFlightRData = rr->QueuedRData; - rr->InFlightRDLen = rr->QueuedRDLen; - rr->OrigRData = rr->resrec.rdata; - rr->OrigRDLen = rr->resrec.rdlength; - rr->QueuedRData = mDNSNULL; - rr->ThisAPInterval = INIT_RECORD_REG_INTERVAL; - rr->LastAPTime = m->timenow - INIT_RECORD_REG_INTERVAL; - return; - } - - // Don't invoke the callback on error as this may not be useful to the client. - // The client may potentially delete the resource record on error which we normally - // delete during deregistration - if (!err && InvokeCallback && rr->RecordCallback) - { - LogInfo("hndlRecordUpdateReply: Calling record callback on %##s", rr->resrec.name->c); - mDNS_DropLockBeforeCallback(); - rr->RecordCallback(m, rr, err); - mDNS_ReclaimLockAfterCallback(); - } - // CAUTION: MUST NOT do anything more with rr after calling rr->Callback(), because the client's callback function - // is allowed to do anything, including starting/stopping queries, registering/deregistering records, etc. - } - -mDNSexport void uDNS_ReceiveNATPMPPacket(mDNS *m, const mDNSInterfaceID InterfaceID, mDNSu8 *pkt, mDNSu16 len) - { - NATTraversalInfo *ptr; - NATAddrReply *AddrReply = (NATAddrReply *)pkt; - NATPortMapReply *PortMapReply = (NATPortMapReply *)pkt; - mDNSu32 nat_elapsed, our_elapsed; - - // Minimum packet is vers (1) opcode (1) err (2) upseconds (4) = 8 bytes - if (!AddrReply->err && len < 8) { LogMsg("NAT Traversal message too short (%d bytes)", len); return; } - if (AddrReply->vers != NATMAP_VERS) { LogMsg("Received NAT Traversal response with version %d (expected %d)", pkt[0], NATMAP_VERS); return; } - - // Read multi-byte numeric values (fields are identical in a NATPortMapReply) - AddrReply->err = (mDNSu16) ( (mDNSu16)pkt[2] << 8 | pkt[3]); - AddrReply->upseconds = (mDNSs32) ((mDNSs32)pkt[4] << 24 | (mDNSs32)pkt[5] << 16 | (mDNSs32)pkt[6] << 8 | pkt[7]); - - nat_elapsed = AddrReply->upseconds - m->LastNATupseconds; - our_elapsed = (m->timenow - m->LastNATReplyLocalTime) / mDNSPlatformOneSecond; - debugf("uDNS_ReceiveNATPMPPacket %X upseconds %u nat_elapsed %d our_elapsed %d", AddrReply->opcode, AddrReply->upseconds, nat_elapsed, our_elapsed); - - // We compute a conservative estimate of how much the NAT gateways's clock should have advanced - // 1. We subtract 12.5% from our own measured elapsed time, to allow for NAT gateways that have an inacurate clock that runs slowly - // 2. We add a two-second safety margin to allow for rounding errors: e.g. - // -- if NAT gateway sends a packet at t=2.000 seconds, then one at t=7.999, that's approximately 6 real seconds, - // but based on the values in the packet (2,7) the apparent difference according to the packet is only 5 seconds - // -- if we're slow handling packets and/or we have coarse clock granularity, - // we could receive the t=2 packet at our t=1.999 seconds, which we round down to 1 - // and the t=7.999 packet at our t=8.000 seconds, which we record as 8, - // giving an apparent local time difference of 7 seconds - // The two-second safety margin coves this possible calculation discrepancy - if (AddrReply->upseconds < m->LastNATupseconds || nat_elapsed + 2 < our_elapsed - our_elapsed/8) - { LogMsg("NAT gateway %#a rebooted", &m->Router); RecreateNATMappings(m); } - - m->LastNATupseconds = AddrReply->upseconds; - m->LastNATReplyLocalTime = m->timenow; -#ifdef _LEGACY_NAT_TRAVERSAL_ - LNT_ClearState(m); -#endif // _LEGACY_NAT_TRAVERSAL_ - - if (AddrReply->opcode == NATOp_AddrResponse) - { -#if APPLE_OSX_mDNSResponder - static char msgbuf[16]; - mDNS_snprintf(msgbuf, sizeof(msgbuf), "%d", AddrReply->err); - mDNSASLLog((uuid_t *)&m->asl_uuid, "natt.natpmp.AddressRequest", AddrReply->err ? "failure" : "success", msgbuf, ""); -#endif - if (!AddrReply->err && len < sizeof(NATAddrReply)) { LogMsg("NAT Traversal AddrResponse message too short (%d bytes)", len); return; } - natTraversalHandleAddressReply(m, AddrReply->err, AddrReply->ExtAddr); - } - else if (AddrReply->opcode == NATOp_MapUDPResponse || AddrReply->opcode == NATOp_MapTCPResponse) - { - mDNSu8 Protocol = AddrReply->opcode & 0x7F; -#if APPLE_OSX_mDNSResponder - static char msgbuf[16]; - mDNS_snprintf(msgbuf, sizeof(msgbuf), "%s - %d", AddrReply->opcode == NATOp_MapUDPResponse ? "UDP" : "TCP", PortMapReply->err); - mDNSASLLog((uuid_t *)&m->asl_uuid, "natt.natpmp.PortMapRequest", PortMapReply->err ? "failure" : "success", msgbuf, ""); -#endif - if (!PortMapReply->err) - { - if (len < sizeof(NATPortMapReply)) { LogMsg("NAT Traversal PortMapReply message too short (%d bytes)", len); return; } - PortMapReply->NATRep_lease = (mDNSu32) ((mDNSu32)pkt[12] << 24 | (mDNSu32)pkt[13] << 16 | (mDNSu32)pkt[14] << 8 | pkt[15]); - } - - // Since some NAT-PMP server implementations don't return the requested internal port in - // the reply, we can't associate this reply with a particular NATTraversalInfo structure. - // We globally keep track of the most recent error code for mappings. - m->LastNATMapResultCode = PortMapReply->err; - - for (ptr = m->NATTraversals; ptr; ptr=ptr->next) - if (ptr->Protocol == Protocol && mDNSSameIPPort(ptr->IntPort, PortMapReply->intport)) - natTraversalHandlePortMapReply(m, ptr, InterfaceID, PortMapReply->err, PortMapReply->extport, PortMapReply->NATRep_lease); - } - else { LogMsg("Received NAT Traversal response with version unknown opcode 0x%X", AddrReply->opcode); return; } - - // Don't need an SSDP socket if we get a NAT-PMP packet - if (m->SSDPSocket) { debugf("uDNS_ReceiveNATPMPPacket destroying SSDPSocket %p", &m->SSDPSocket); mDNSPlatformUDPClose(m->SSDPSocket); m->SSDPSocket = mDNSNULL; } - } - -// Shorten DNS-SD queries to avoid NAT bugs -// Add check to avoid crashing NAT gateways that have buggy DNS relay code -// -// We know of bugs in home NAT gateways that cause them to crash if they receive certain DNS queries. -// The DNS queries that make them crash are perfectly legal DNS queries, but even if they weren't, -// the gateway shouldn't crash -- in today's world of viruses and network attacks, software has to -// be written assuming that a malicious attacker could send them any packet, properly-formed or not. -// Still, we don't want to be crashing people's home gateways, so we go out of our way to avoid -// the queries that crash them. -// -// Some examples: -// -// 1. Any query where the name ends in ".in-addr.arpa." and the text before this is 32 or more bytes. -// The query type does not need to be PTR -- the gateway will crash for any query type. -// e.g. "ping long-name-crashes-the-buggy-router.in-addr.arpa" will crash one of these. -// -// 2. Any query that results in a large response with the TC bit set. -// -// 3. Any PTR query that doesn't begin with four decimal numbers. -// These gateways appear to assume that the only possible PTR query is a reverse-mapping query -// (e.g. "1.0.168.192.in-addr.arpa") and if they ever get a PTR query where the first four -// labels are not all decimal numbers in the range 0-255, they handle that by crashing. -// These gateways also ignore the remainder of the name following the four decimal numbers -// -- whether or not it actually says in-addr.arpa, they just make up an answer anyway. -// -// The challenge therefore is to craft a query that will discern whether the DNS server -// is one of these buggy ones, without crashing it. Furthermore we don't want our test -// queries making it all the way to the root name servers, putting extra load on those -// name servers and giving Apple a bad reputation. To this end we send this query: -// dig -t ptr 1.0.0.127.dnsbugtest.1.0.0.127.in-addr.arpa. -// -// The text preceding the ".in-addr.arpa." is under 32 bytes, so it won't cause crash (1). -// It will not yield a large response with the TC bit set, so it won't cause crash (2). -// It starts with four decimal numbers, so it won't cause crash (3). -// The name falls within the "1.0.0.127.in-addr.arpa." domain, the reverse-mapping name for the local -// loopback address, and therefore the query will black-hole at the first properly-configured DNS server -// it reaches, making it highly unlikely that this query will make it all the way to the root. -// -// Finally, the correct response to this query is NXDOMAIN or a similar error, but the -// gateways that ignore the remainder of the name following the four decimal numbers -// give themselves away by actually returning a result for this nonsense query. - -mDNSlocal const domainname *DNSRelayTestQuestion = (const domainname*) - "\x1" "1" "\x1" "0" "\x1" "0" "\x3" "127" "\xa" "dnsbugtest" - "\x1" "1" "\x1" "0" "\x1" "0" "\x3" "127" "\x7" "in-addr" "\x4" "arpa"; - -// See comments above for DNSRelayTestQuestion -// If this is the kind of query that has the risk of crashing buggy DNS servers, we do a test question first -mDNSlocal mDNSBool NoTestQuery(DNSQuestion *q) - { - int i; - mDNSu8 *p = q->qname.c; - if (q->AuthInfo) return(mDNStrue); // Don't need a test query for private queries sent directly to authoritative server over TLS/TCP - if (q->qtype != kDNSType_PTR) return(mDNStrue); // Don't need a test query for any non-PTR queries - for (i=0; i<4; i++) // If qname does not begin with num.num.num.num, can't skip the test query - { - if (p[0] < 1 || p[0] > 3) return(mDNSfalse); - if ( p[1] < '0' || p[1] > '9' ) return(mDNSfalse); - if (p[0] >= 2 && (p[2] < '0' || p[2] > '9')) return(mDNSfalse); - if (p[0] >= 3 && (p[3] < '0' || p[3] > '9')) return(mDNSfalse); - p += 1 + p[0]; - } - // If remainder of qname is ".in-addr.arpa.", this is a vanilla reverse-mapping query and - // we can safely do it without needing a test query first, otherwise we need the test query. - return(SameDomainName((domainname*)p, (const domainname*)"\x7" "in-addr" "\x4" "arpa")); - } - -// Returns mDNStrue if response was handled -mDNSlocal mDNSBool uDNS_ReceiveTestQuestionResponse(mDNS *const m, DNSMessage *const msg, const mDNSu8 *const end, - const mDNSAddr *const srcaddr, const mDNSIPPort srcport) - { - const mDNSu8 *ptr = msg->data; - DNSQuestion pktq; - DNSServer *s; - mDNSu32 result = 0; - - // 1. Find out if this is an answer to one of our test questions - if (msg->h.numQuestions != 1) return(mDNSfalse); - ptr = getQuestion(msg, ptr, end, mDNSInterface_Any, &pktq); - if (!ptr) return(mDNSfalse); - if (pktq.qtype != kDNSType_PTR || pktq.qclass != kDNSClass_IN) return(mDNSfalse); - if (!SameDomainName(&pktq.qname, DNSRelayTestQuestion)) return(mDNSfalse); - - // 2. If the DNS relay gave us a positive response, then it's got buggy firmware - // else, if the DNS relay gave us an error or no-answer response, it passed our test - if ((msg->h.flags.b[1] & kDNSFlag1_RC_Mask) == kDNSFlag1_RC_NoErr && msg->h.numAnswers > 0) - result = DNSServer_Failed; - else - result = DNSServer_Passed; - - // 3. Find occurrences of this server in our list, and mark them appropriately - for (s = m->DNSServers; s; s = s->next) - { - mDNSBool matchaddr = (s->teststate != result && mDNSSameAddress(srcaddr, &s->addr) && mDNSSameIPPort(srcport, s->port)); - mDNSBool matchid = (s->teststate == DNSServer_Untested && mDNSSameOpaque16(msg->h.id, s->testid)); - if (matchaddr || matchid) - { - DNSQuestion *q; - s->teststate = result; - if (result == DNSServer_Passed) - { - LogInfo("DNS Server %#a:%d (%#a:%d) %d passed%s", - &s->addr, mDNSVal16(s->port), srcaddr, mDNSVal16(srcport), mDNSVal16(s->testid), - matchaddr ? "" : " NOTE: Reply did not come from address to which query was sent"); - } - else - { - LogMsg("NOTE: Wide-Area Service Discovery disabled to avoid crashing defective DNS relay %#a:%d (%#a:%d) %d%s", - &s->addr, mDNSVal16(s->port), srcaddr, mDNSVal16(srcport), mDNSVal16(s->testid), - matchaddr ? "" : " NOTE: Reply did not come from address to which query was sent"); - } - - // If this server has just changed state from DNSServer_Untested to DNSServer_Passed, then retrigger any waiting questions. - // We use the NoTestQuery() test so that we only retrigger questions that were actually blocked waiting for this test to complete. - if (result == DNSServer_Passed) // Unblock any questions that were waiting for this result - for (q = m->Questions; q; q=q->next) - if (q->qDNSServer == s && !NoTestQuery(q)) - { - q->ThisQInterval = INIT_UCAST_POLL_INTERVAL / QuestionIntervalStep; - q->unansweredQueries = 0; - q->LastQTime = m->timenow - q->ThisQInterval; - m->NextScheduledQuery = m->timenow; - } - } - } - - return(mDNStrue); // Return mDNStrue to tell uDNS_ReceiveMsg it doesn't need to process this packet further - } - -// Called from mDNSCoreReceive with the lock held -mDNSexport void uDNS_ReceiveMsg(mDNS *const m, DNSMessage *const msg, const mDNSu8 *const end, const mDNSAddr *const srcaddr, const mDNSIPPort srcport) - { - DNSQuestion *qptr; - mStatus err = mStatus_NoError; - - mDNSu8 StdR = kDNSFlag0_QR_Response | kDNSFlag0_OP_StdQuery; - mDNSu8 UpdateR = kDNSFlag0_QR_Response | kDNSFlag0_OP_Update; - mDNSu8 QR_OP = (mDNSu8)(msg->h.flags.b[0] & kDNSFlag0_QROP_Mask); - mDNSu8 rcode = (mDNSu8)(msg->h.flags.b[1] & kDNSFlag1_RC_Mask); - - (void)srcport; // Unused - - debugf("uDNS_ReceiveMsg from %#-15a with " - "%2d Question%s %2d Answer%s %2d Authorit%s %2d Additional%s %d bytes", - srcaddr, - msg->h.numQuestions, msg->h.numQuestions == 1 ? ", " : "s,", - msg->h.numAnswers, msg->h.numAnswers == 1 ? ", " : "s,", - msg->h.numAuthorities, msg->h.numAuthorities == 1 ? "y, " : "ies,", - msg->h.numAdditionals, msg->h.numAdditionals == 1 ? "" : "s", end - msg->data); - - if (QR_OP == StdR) - { - //if (srcaddr && recvLLQResponse(m, msg, end, srcaddr, srcport)) return; - if (uDNS_ReceiveTestQuestionResponse(m, msg, end, srcaddr, srcport)) return; - for (qptr = m->Questions; qptr; qptr = qptr->next) - if (msg->h.flags.b[0] & kDNSFlag0_TC && mDNSSameOpaque16(qptr->TargetQID, msg->h.id) && m->timenow - qptr->LastQTime < RESPONSE_WINDOW) - { - if (!srcaddr) LogMsg("uDNS_ReceiveMsg: TCP DNS response had TC bit set: ignoring"); - else - { - // Don't reuse TCP connections. We might have failed over to a different DNS server - // while the first TCP connection is in progress. We need a new TCP connection to the - // new DNS server. So, always try to establish a new connection. - if (qptr->tcp) { DisposeTCPConn(qptr->tcp); qptr->tcp = mDNSNULL; } - qptr->tcp = MakeTCPConn(m, mDNSNULL, mDNSNULL, kTCPSocketFlags_Zero, srcaddr, srcport, mDNSNULL, qptr, mDNSNULL); - } - } - } - - if (QR_OP == UpdateR) - { - mDNSu32 lease = GetPktLease(m, msg, end); - mDNSs32 expire = m->timenow + (mDNSs32)lease * mDNSPlatformOneSecond; - mDNSu32 random = mDNSRandom((mDNSs32)lease * mDNSPlatformOneSecond/10); - - //rcode = kDNSFlag1_RC_ServFail; // Simulate server failure (rcode 2) - - // Walk through all the records that matches the messageID. There could be multiple - // records if we had sent them in a group - if (m->CurrentRecord) - LogMsg("uDNS_ReceiveMsg ERROR m->CurrentRecord already set %s", ARDisplayString(m, m->CurrentRecord)); - m->CurrentRecord = m->ResourceRecords; - while (m->CurrentRecord) - { - AuthRecord *rptr = m->CurrentRecord; - m->CurrentRecord = m->CurrentRecord->next; - if (AuthRecord_uDNS(rptr) && mDNSSameOpaque16(rptr->updateid, msg->h.id)) - { - err = checkUpdateResult(m, rptr->resrec.name, rcode, msg, end); - if (!err && rptr->uselease && lease) - if (rptr->expire - expire >= 0 || rptr->state != regState_UpdatePending) - { - rptr->expire = expire; - rptr->refreshCount = 0; - } - // We pass the random value to make sure that if we update multiple - // records, they all get the same random value - hndlRecordUpdateReply(m, rptr, err, random); - } - } - } - debugf("Received unexpected response: ID %d matches no active records", mDNSVal16(msg->h.id)); - } - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - Query Routines -#endif - -mDNSexport void sendLLQRefresh(mDNS *m, DNSQuestion *q) - { - mDNSu8 *end; - LLQOptData llq; - mDNSu8 *limit = m->omsg.data + AbsoluteMaxDNSMessageData; - - if (q->ReqLease) - if ((q->state == LLQ_Established && q->ntries >= kLLQ_MAX_TRIES) || q->expire - m->timenow < 0) - { - LogMsg("Unable to refresh LLQ %##s (%s) - will retry in %d seconds", q->qname.c, DNSTypeName(q->qtype), LLQ_POLL_INTERVAL / mDNSPlatformOneSecond); - StartLLQPolling(m,q); - return; - } - - llq.vers = kLLQ_Vers; - llq.llqOp = kLLQOp_Refresh; - llq.err = q->tcp ? GetLLQEventPort(m, &q->servAddr) : LLQErr_NoError; // If using TCP tell server what UDP port to send notifications to - llq.id = q->id; - llq.llqlease = q->ReqLease; - - InitializeDNSMessage(&m->omsg.h, q->TargetQID, uQueryFlags); - end = putLLQ(&m->omsg, m->omsg.data, q, &llq); - if (!end) { LogMsg("sendLLQRefresh: putLLQ failed %##s (%s)", q->qname.c, DNSTypeName(q->qtype)); return; } - - // Note that we (conditionally) add HINFO and TSIG here, since the question might be going away, - // so we may not be able to reference it (most importantly it's AuthInfo) when we actually send the message - end = putHINFO(m, &m->omsg, end, q->AuthInfo, limit); - if (!end) { LogMsg("sendLLQRefresh: putHINFO failed %##s (%s)", q->qname.c, DNSTypeName(q->qtype)); return; } - - if (PrivateQuery(q)) - { - DNSDigest_SignMessageHostByteOrder(&m->omsg, &end, q->AuthInfo); - if (!end) { LogMsg("sendLLQRefresh: DNSDigest_SignMessage failed %##s (%s)", q->qname.c, DNSTypeName(q->qtype)); return; } - } - - if (PrivateQuery(q) && !q->tcp) - { - LogInfo("sendLLQRefresh setting up new TLS session %##s (%s)", q->qname.c, DNSTypeName(q->qtype)); - if (!q->nta) { LogMsg("sendLLQRefresh:ERROR!! q->nta is NULL for %##s (%s)", q->qname.c, DNSTypeName(q->qtype)); return; } - q->tcp = MakeTCPConn(m, &m->omsg, end, kTCPSocketFlags_UseTLS, &q->servAddr, q->servPort, &q->nta->Host, q, mDNSNULL); - } - else - { - mStatus err; - - // if AuthInfo and AuthInfo->AutoTunnel is set, we use the TCP socket but don't need to pass the AuthInfo as - // we already protected the message above. - LogInfo("sendLLQRefresh: using existing %s session %##s (%s)", PrivateQuery(q) ? "TLS" : "UDP", - q->qname.c, DNSTypeName(q->qtype)); - - err = mDNSSendDNSMessage(m, &m->omsg, end, mDNSInterface_Any, q->LocalSocket, &q->servAddr, q->servPort, q->tcp ? q->tcp->sock : mDNSNULL, mDNSNULL); - if (err) - { - LogMsg("sendLLQRefresh: mDNSSendDNSMessage%s failed: %d", q->tcp ? " (TCP)" : "", err); - if (q->tcp) { DisposeTCPConn(q->tcp); q->tcp = mDNSNULL; } - } - } - - q->ntries++; - - debugf("sendLLQRefresh ntries %d %##s (%s)", q->ntries, q->qname.c, DNSTypeName(q->qtype)); - - q->LastQTime = m->timenow; - SetNextQueryTime(m, q); - } - -mDNSexport void LLQGotZoneData(mDNS *const m, mStatus err, const ZoneData *zoneInfo) - { - DNSQuestion *q = (DNSQuestion *)zoneInfo->ZoneDataContext; - - mDNS_Lock(m); - - // If we get here it means that the GetZoneData operation has completed. - // We hold on to the zone data if it is AutoTunnel as we use the hostname - // in zoneInfo during the TLS connection setup. - q->servAddr = zeroAddr; - q->servPort = zeroIPPort; - - if (!err && zoneInfo && !mDNSIPPortIsZero(zoneInfo->Port) && !mDNSAddressIsZero(&zoneInfo->Addr) && zoneInfo->Host.c[0]) - { - q->servAddr = zoneInfo->Addr; - q->servPort = zoneInfo->Port; - if (!PrivateQuery(q)) - { - // We don't need the zone data as we use it only for the Host information which we - // don't need if we are not going to use TLS connections. - if (q->nta) - { - if (q->nta != zoneInfo) LogMsg("LLQGotZoneData: nta (%p) != zoneInfo (%p) %##s (%s)", q->nta, zoneInfo, q->qname.c, DNSTypeName(q->qtype)); - CancelGetZoneData(m, q->nta); - q->nta = mDNSNULL; - } - } - q->ntries = 0; - debugf("LLQGotZoneData %#a:%d", &q->servAddr, mDNSVal16(q->servPort)); - startLLQHandshake(m, q); - } - else - { - if (q->nta) - { - if (q->nta != zoneInfo) LogMsg("LLQGotZoneData: nta (%p) != zoneInfo (%p) %##s (%s)", q->nta, zoneInfo, q->qname.c, DNSTypeName(q->qtype)); - CancelGetZoneData(m, q->nta); - q->nta = mDNSNULL; - } - StartLLQPolling(m,q); - if (err == mStatus_NoSuchNameErr) - { - // this actually failed, so mark it by setting address to all ones - q->servAddr.type = mDNSAddrType_IPv4; - q->servAddr.ip.v4 = onesIPv4Addr; - } - } - - mDNS_Unlock(m); - } - -// Called in normal callback context (i.e. mDNS_busy and mDNS_reentrancy are both 1) -mDNSlocal void PrivateQueryGotZoneData(mDNS *const m, mStatus err, const ZoneData *zoneInfo) - { - DNSQuestion *q = (DNSQuestion *) zoneInfo->ZoneDataContext; - - LogInfo("PrivateQueryGotZoneData %##s (%s) err %d Zone %##s Private %d", q->qname.c, DNSTypeName(q->qtype), err, zoneInfo->ZoneName.c, zoneInfo->ZonePrivate); - - if (q->nta != zoneInfo) LogMsg("PrivateQueryGotZoneData:ERROR!!: nta (%p) != zoneInfo (%p) %##s (%s)", q->nta, zoneInfo, q->qname.c, DNSTypeName(q->qtype)); - - if (err || !zoneInfo || mDNSAddressIsZero(&zoneInfo->Addr) || mDNSIPPortIsZero(zoneInfo->Port) || !zoneInfo->Host.c[0]) - { - LogInfo("PrivateQueryGotZoneData: ERROR!! %##s (%s) invoked with error code %d %p %#a:%d", - q->qname.c, DNSTypeName(q->qtype), err, zoneInfo, - zoneInfo ? &zoneInfo->Addr : mDNSNULL, - zoneInfo ? mDNSVal16(zoneInfo->Port) : 0); - CancelGetZoneData(m, q->nta); - q->nta = mDNSNULL; - return; - } - - if (!zoneInfo->ZonePrivate) - { - debugf("Private port lookup failed -- retrying without TLS -- %##s (%s)", q->qname.c, DNSTypeName(q->qtype)); - q->AuthInfo = mDNSNULL; // Clear AuthInfo so we try again non-private - q->ThisQInterval = InitialQuestionInterval; - q->LastQTime = m->timenow - q->ThisQInterval; - CancelGetZoneData(m, q->nta); - q->nta = mDNSNULL; - mDNS_Lock(m); - SetNextQueryTime(m, q); - mDNS_Unlock(m); - return; - // Next call to uDNS_CheckCurrentQuestion() will do this as a non-private query - } - - if (!PrivateQuery(q)) - { - LogMsg("PrivateQueryGotZoneData: ERROR!! Not a private query %##s (%s) AuthInfo %p", q->qname.c, DNSTypeName(q->qtype), q->AuthInfo); - CancelGetZoneData(m, q->nta); - q->nta = mDNSNULL; - return; - } - - q->TargetQID = mDNS_NewMessageID(m); - if (q->tcp) { DisposeTCPConn(q->tcp); q->tcp = mDNSNULL; } - if (!q->nta) { LogMsg("PrivateQueryGotZoneData:ERROR!! nta is NULL for %##s (%s)", q->qname.c, DNSTypeName(q->qtype)); return; } - q->tcp = MakeTCPConn(m, mDNSNULL, mDNSNULL, kTCPSocketFlags_UseTLS, &zoneInfo->Addr, zoneInfo->Port, &q->nta->Host, q, mDNSNULL); - if (q->nta) { CancelGetZoneData(m, q->nta); q->nta = mDNSNULL; } - } - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - Dynamic Updates -#endif - -// Called in normal callback context (i.e. mDNS_busy and mDNS_reentrancy are both 1) -mDNSexport void RecordRegistrationGotZoneData(mDNS *const m, mStatus err, const ZoneData *zoneData) - { - AuthRecord *newRR = (AuthRecord*)zoneData->ZoneDataContext; - AuthRecord *ptr; - int c1, c2; - - if (newRR->nta != zoneData) - LogMsg("RecordRegistrationGotZoneData: nta (%p) != zoneData (%p) %##s (%s)", newRR->nta, zoneData, newRR->resrec.name->c, DNSTypeName(newRR->resrec.rrtype)); - - if (m->mDNS_busy != m->mDNS_reentrancy) - LogMsg("RecordRegistrationGotZoneData: mDNS_busy (%ld) != mDNS_reentrancy (%ld)", m->mDNS_busy, m->mDNS_reentrancy); - - // make sure record is still in list (!!!) - for (ptr = m->ResourceRecords; ptr; ptr = ptr->next) if (ptr == newRR) break; - if (!ptr) - { - LogMsg("RecordRegistrationGotZoneData - RR no longer in list. Discarding."); - CancelGetZoneData(m, newRR->nta); - newRR->nta = mDNSNULL; - return; - } - - // check error/result - if (err) - { - if (err != mStatus_NoSuchNameErr) LogMsg("RecordRegistrationGotZoneData: error %d", err); - CancelGetZoneData(m, newRR->nta); - newRR->nta = mDNSNULL; - return; - } - - if (!zoneData) { LogMsg("ERROR: RecordRegistrationGotZoneData invoked with NULL result and no error"); return; } - - if (newRR->resrec.rrclass != zoneData->ZoneClass) - { - LogMsg("ERROR: New resource record's class (%d) does not match zone class (%d)", newRR->resrec.rrclass, zoneData->ZoneClass); - CancelGetZoneData(m, newRR->nta); - newRR->nta = mDNSNULL; - return; - } - - // Don't try to do updates to the root name server. - // We might be tempted also to block updates to any single-label name server (e.g. com, edu, net, etc.) but some - // organizations use their own private pseudo-TLD, like ".home", etc, and we don't want to block that. - if (zoneData->ZoneName.c[0] == 0) - { - LogInfo("RecordRegistrationGotZoneData: No name server found claiming responsibility for \"%##s\"!", newRR->resrec.name->c); - CancelGetZoneData(m, newRR->nta); - newRR->nta = mDNSNULL; - return; - } - - // Store discovered zone data - c1 = CountLabels(newRR->resrec.name); - c2 = CountLabels(&zoneData->ZoneName); - if (c2 > c1) - { - LogMsg("RecordRegistrationGotZoneData: Zone \"%##s\" is longer than \"%##s\"", zoneData->ZoneName.c, newRR->resrec.name->c); - CancelGetZoneData(m, newRR->nta); - newRR->nta = mDNSNULL; - return; - } - newRR->zone = SkipLeadingLabels(newRR->resrec.name, c1-c2); - if (!SameDomainName(newRR->zone, &zoneData->ZoneName)) - { - LogMsg("RecordRegistrationGotZoneData: Zone \"%##s\" does not match \"%##s\" for \"%##s\"", newRR->zone->c, zoneData->ZoneName.c, newRR->resrec.name->c); - CancelGetZoneData(m, newRR->nta); - newRR->nta = mDNSNULL; - return; - } - - if (mDNSIPPortIsZero(zoneData->Port) || mDNSAddressIsZero(&zoneData->Addr) || !zoneData->Host.c[0]) - { - LogInfo("RecordRegistrationGotZoneData: No _dns-update._udp service found for \"%##s\"!", newRR->resrec.name->c); - CancelGetZoneData(m, newRR->nta); - newRR->nta = mDNSNULL; - return; - } - - newRR->Private = zoneData->ZonePrivate; - debugf("RecordRegistrationGotZoneData: Set zone information for %##s %##s to %#a:%d", - newRR->resrec.name->c, zoneData->ZoneName.c, &zoneData->Addr, mDNSVal16(zoneData->Port)); - - // If we are deregistering, uDNS_DeregisterRecord will do that as it has the zone data now. - if (newRR->state == regState_DeregPending) - { - mDNS_Lock(m); - uDNS_DeregisterRecord(m, newRR); - mDNS_Unlock(m); - return; - } - - if (newRR->resrec.rrtype == kDNSType_SRV) - { - const domainname *target; - // Reevaluate the target always as NAT/Target could have changed while - // we were fetching zone data. - mDNS_Lock(m); - target = GetServiceTarget(m, newRR); - mDNS_Unlock(m); - if (!target || target->c[0] == 0) - { - domainname *t = GetRRDomainNameTarget(&newRR->resrec); - LogInfo("RecordRegistrationGotZoneData - no target for %##s", newRR->resrec.name->c); - if (t) t->c[0] = 0; - newRR->resrec.rdlength = newRR->resrec.rdestimate = 0; - newRR->state = regState_NoTarget; - CancelGetZoneData(m, newRR->nta); - newRR->nta = mDNSNULL; - return; - } - } - // If we have non-zero service port (always?) - // and a private address, and update server is non-private - // and this service is AutoTarget - // then initiate a NAT mapping request. On completion it will do SendRecordRegistration() for us - if (newRR->resrec.rrtype == kDNSType_SRV && !mDNSIPPortIsZero(newRR->resrec.rdata->u.srv.port) && - mDNSv4AddrIsRFC1918(&m->AdvertisedV4.ip.v4) && newRR->nta && !mDNSAddrIsRFC1918(&newRR->nta->Addr) && - newRR->AutoTarget == Target_AutoHostAndNATMAP) - { - DomainAuthInfo *AuthInfo; - AuthInfo = GetAuthInfoForName(m, newRR->resrec.name); - if (AuthInfo && AuthInfo->AutoTunnel) - { - domainname *t = GetRRDomainNameTarget(&newRR->resrec); - LogMsg("RecordRegistrationGotZoneData: ERROR!! AutoTunnel has Target_AutoHostAndNATMAP for %s", ARDisplayString(m, newRR)); - if (t) t->c[0] = 0; - newRR->resrec.rdlength = newRR->resrec.rdestimate = 0; - newRR->state = regState_NoTarget; - CancelGetZoneData(m, newRR->nta); - newRR->nta = mDNSNULL; - return; - } - // During network transitions, we are called multiple times in different states. Setup NAT - // state just once for this record. - if (!newRR->NATinfo.clientContext) - { - LogInfo("RecordRegistrationGotZoneData StartRecordNatMap %s", ARDisplayString(m, newRR)); - newRR->state = regState_NATMap; - StartRecordNatMap(m, newRR); - return; - } - else LogInfo("RecordRegistrationGotZoneData: StartRecordNatMap for %s, state %d, context %p", ARDisplayString(m, newRR), newRR->state, newRR->NATinfo.clientContext); - } - mDNS_Lock(m); - // We want IsRecordMergeable to check whether it is a record whose update can be - // sent with others. We set the time before we call IsRecordMergeable, so that - // it does not fail this record based on time. We are interested in other checks - // at this time. If a previous update resulted in error, then don't reset the - // interval. Preserve the back-off so that we don't keep retrying aggressively. - if (newRR->updateError == mStatus_NoError) - { - newRR->ThisAPInterval = INIT_RECORD_REG_INTERVAL; - newRR->LastAPTime = m->timenow - INIT_RECORD_REG_INTERVAL; - } - if (IsRecordMergeable(m, newRR, m->timenow + MERGE_DELAY_TIME)) - { - // Delay the record registration by MERGE_DELAY_TIME so that we can merge them - // into one update - LogInfo("RecordRegistrationGotZoneData: Delayed registration for %s", ARDisplayString(m, newRR)); - newRR->LastAPTime += MERGE_DELAY_TIME; - } - mDNS_Unlock(m); - } - -mDNSlocal void SendRecordDeregistration(mDNS *m, AuthRecord *rr) - { - mDNSu8 *ptr = m->omsg.data; - mDNSu8 *limit; - DomainAuthInfo *AuthInfo; - - if (m->mDNS_busy != m->mDNS_reentrancy+1) - LogMsg("SendRecordDeRegistration: Lock not held! mDNS_busy (%ld) mDNS_reentrancy (%ld)", m->mDNS_busy, m->mDNS_reentrancy); - - if (!rr->nta || mDNSIPv4AddressIsZero(rr->nta->Addr.ip.v4)) - { - LogMsg("SendRecordDeRegistration: No zone info for Resource record %s RecordType %d", ARDisplayString(m, rr), rr->resrec.RecordType); - return; - } - - limit = ptr + AbsoluteMaxDNSMessageData; - AuthInfo = GetAuthInfoForName_internal(m, rr->resrec.name); - limit -= RRAdditionalSize(m, AuthInfo); - - rr->updateid = mDNS_NewMessageID(m); - InitializeDNSMessage(&m->omsg.h, rr->updateid, UpdateReqFlags); - - // set zone - ptr = putZone(&m->omsg, ptr, limit, rr->zone, mDNSOpaque16fromIntVal(rr->resrec.rrclass)); - if (!ptr) goto exit; - - ptr = BuildUpdateMessage(m, ptr, rr, limit); - - if (!ptr) goto exit; - - if (rr->Private) - { - LogInfo("SendRecordDeregistration TCP %p %s", rr->tcp, ARDisplayString(m, rr)); - if (rr->tcp) LogInfo("SendRecordDeregistration: Disposing existing TCP connection for %s", ARDisplayString(m, rr)); - if (rr->tcp) { DisposeTCPConn(rr->tcp); rr->tcp = mDNSNULL; } - if (!rr->nta) { LogMsg("SendRecordDeregistration:Private:ERROR!! nta is NULL for %s", ARDisplayString(m, rr)); return; } - rr->tcp = MakeTCPConn(m, &m->omsg, ptr, kTCPSocketFlags_UseTLS, &rr->nta->Addr, rr->nta->Port, &rr->nta->Host, mDNSNULL, rr); - } - else - { - mStatus err; - LogInfo("SendRecordDeregistration UDP %s", ARDisplayString(m, rr)); - if (!rr->nta) { LogMsg("SendRecordDeregistration:ERROR!! nta is NULL for %s", ARDisplayString(m, rr)); return; } - err = mDNSSendDNSMessage(m, &m->omsg, ptr, mDNSInterface_Any, mDNSNULL, &rr->nta->Addr, rr->nta->Port, mDNSNULL, GetAuthInfoForName_internal(m, rr->resrec.name)); - if (err) debugf("ERROR: SendRecordDeregistration - mDNSSendDNSMessage - %d", err); - //if (rr->state == regState_DeregPending) CompleteDeregistration(m, rr); // Don't touch rr after this - } - SetRecordRetry(m, rr, 0); - return; -exit: - LogMsg("SendRecordDeregistration: Error formatting message for %s", ARDisplayString(m, rr)); - } - -mDNSexport mStatus uDNS_DeregisterRecord(mDNS *const m, AuthRecord *const rr) - { - DomainAuthInfo *info; - - LogInfo("uDNS_DeregisterRecord: Resource Record %s, state %d", ARDisplayString(m, rr), rr->state); - - switch (rr->state) - { - case regState_Refresh: - case regState_Pending: - case regState_UpdatePending: - case regState_Registered: break; - case regState_DeregPending: break; - - case regState_NATError: - case regState_NATMap: - // A record could be in NoTarget to start with if the corresponding SRV record could not find a target. - // It is also possible to reenter the NoTarget state when we move to a network with a NAT that has - // no NAT-PMP/UPnP support. In that case before we entered NoTarget, we already deregistered with - // the server. - case regState_NoTarget: - case regState_Unregistered: - case regState_Zero: - default: - LogInfo("uDNS_DeregisterRecord: State %d for %##s type %s", rr->state, rr->resrec.name->c, DNSTypeName(rr->resrec.rrtype)); - // This function may be called during sleep when there are no sleep proxy servers - if (rr->resrec.RecordType == kDNSRecordTypeDeregistering) CompleteDeregistration(m, rr); - return mStatus_NoError; - } - - // If a current group registration is pending, we can't send this deregisration till that registration - // has reached the server i.e., the ordering is important. Previously, if we did not send this - // registration in a group, then the previous connection will be torn down as part of sending the - // deregistration. If we send this in a group, we need to locate the resource record that was used - // to send this registration and terminate that connection. This means all the updates on that might - // be lost (assuming the response is not waiting for us at the socket) and the retry will send the - // update again sometime in the near future. - // - // NOTE: SSL handshake failures normally free the TCP connection immediately. Hence, you may not - // find the TCP below there. This case can happen only when tcp is trying to actively retransmit - // the request or SSL negotiation taking time i.e resource record is actively trying to get the - // message to the server. During that time a deregister has to happen. - - if (!mDNSOpaque16IsZero(rr->updateid)) - { - AuthRecord *anchorRR; - mDNSBool found = mDNSfalse; - for (anchorRR = m->ResourceRecords; anchorRR; anchorRR = anchorRR->next) - { - if (AuthRecord_uDNS(rr) && mDNSSameOpaque16(anchorRR->updateid, rr->updateid) && anchorRR->tcp) - { - LogInfo("uDNS_DeregisterRecord: Found Anchor RR %s terminated", ARDisplayString(m, anchorRR)); - if (found) - LogMsg("uDNS_DeregisterRecord: ERROR: Another anchorRR %s found", ARDisplayString(m, anchorRR)); - DisposeTCPConn(anchorRR->tcp); - anchorRR->tcp = mDNSNULL; - found = mDNStrue; - } - } - if (!found) LogInfo("uDNSDeregisterRecord: Cannot find the anchor Resource Record for %s, not an error", ARDisplayString(m, rr)); - } - - // Retry logic for deregistration should be no different from sending registration the first time. - // Currently ThisAPInterval most likely is set to the refresh interval - rr->state = regState_DeregPending; - rr->ThisAPInterval = INIT_RECORD_REG_INTERVAL; - rr->LastAPTime = m->timenow - INIT_RECORD_REG_INTERVAL; - info = GetAuthInfoForName_internal(m, rr->resrec.name); - if (IsRecordMergeable(m, rr, m->timenow + MERGE_DELAY_TIME)) - { - // Delay the record deregistration by MERGE_DELAY_TIME so that we can merge them - // into one update. If the domain is being deleted, delay by 2 * MERGE_DELAY_TIME - // so that we can merge all the AutoTunnel records and the service records in - // one update (they get deregistered a little apart) - if (info && info->deltime) rr->LastAPTime += (2 * MERGE_DELAY_TIME); - else rr->LastAPTime += MERGE_DELAY_TIME; - } - // IsRecordMergeable could have returned false for several reasons e.g., DontMerge is set or - // no zone information. Most likely it is the latter, CheckRecordUpdates will fetch the zone - // data when it encounters this record. - - if (m->NextuDNSEvent - (rr->LastAPTime + rr->ThisAPInterval) >= 0) - m->NextuDNSEvent = (rr->LastAPTime + rr->ThisAPInterval); - - return mStatus_NoError; - } - -mDNSexport mStatus uDNS_UpdateRecord(mDNS *m, AuthRecord *rr) - { - LogInfo("uDNS_UpdateRecord: Resource Record %##s, state %d", rr->resrec.name->c, rr->state); - switch(rr->state) - { - case regState_DeregPending: - case regState_Unregistered: - // not actively registered - goto unreg_error; - - case regState_NATMap: - case regState_NoTarget: - // change rdata directly since it hasn't been sent yet - if (rr->UpdateCallback) rr->UpdateCallback(m, rr, rr->resrec.rdata, rr->resrec.rdlength); - SetNewRData(&rr->resrec, rr->NewRData, rr->newrdlength); - rr->NewRData = mDNSNULL; - return mStatus_NoError; - - case regState_Pending: - case regState_Refresh: - case regState_UpdatePending: - // registration in-flight. queue rdata and return - if (rr->QueuedRData && rr->UpdateCallback) - // if unsent rdata is already queued, free it before we replace it - rr->UpdateCallback(m, rr, rr->QueuedRData, rr->QueuedRDLen); - rr->QueuedRData = rr->NewRData; - rr->QueuedRDLen = rr->newrdlength; - rr->NewRData = mDNSNULL; - return mStatus_NoError; - - case regState_Registered: - rr->OrigRData = rr->resrec.rdata; - rr->OrigRDLen = rr->resrec.rdlength; - rr->InFlightRData = rr->NewRData; - rr->InFlightRDLen = rr->newrdlength; - rr->NewRData = mDNSNULL; - rr->state = regState_UpdatePending; - rr->ThisAPInterval = INIT_RECORD_REG_INTERVAL; - rr->LastAPTime = m->timenow - INIT_RECORD_REG_INTERVAL; - return mStatus_NoError; - - case regState_NATError: - LogMsg("ERROR: uDNS_UpdateRecord called for record %##s with bad state regState_NATError", rr->resrec.name->c); - return mStatus_UnknownErr; // states for service records only - - default: LogMsg("uDNS_UpdateRecord: Unknown state %d for %##s", rr->state, rr->resrec.name->c); - } - - unreg_error: - LogMsg("uDNS_UpdateRecord: Requested update of record %##s type %d, in erroneous state %d", - rr->resrec.name->c, rr->resrec.rrtype, rr->state); - return mStatus_Invalid; - } - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - Periodic Execution Routines -#endif - -// The question to be checked is not passed in as an explicit parameter; -// instead it is implicit that the question to be checked is m->CurrentQuestion. -mDNSexport void uDNS_CheckCurrentQuestion(mDNS *const m) - { - DNSQuestion *q = m->CurrentQuestion; - if (m->timenow - NextQSendTime(q) < 0) return; - - if (q->LongLived) - { - switch (q->state) - { - case LLQ_InitialRequest: startLLQHandshake(m, q); break; - case LLQ_SecondaryRequest: - // For PrivateQueries, we need to start the handshake again as we don't do the Challenge/Response step - if (PrivateQuery(q)) - startLLQHandshake(m, q); - else - sendChallengeResponse(m, q, mDNSNULL); - break; - case LLQ_Established: sendLLQRefresh(m, q); break; - case LLQ_Poll: break; // Do nothing (handled below) - } - } - - // We repeat the check above (rather than just making this the "else" case) because startLLQHandshake can change q->state to LLQ_Poll - if (!(q->LongLived && q->state != LLQ_Poll)) - { - if (q->unansweredQueries >= MAX_UCAST_UNANSWERED_QUERIES) - { - DNSServer *orig = q->qDNSServer; - if (orig) - LogInfo("uDNS_CheckCurrentQuestion: Sent %d unanswered queries for %##s (%s) to %#a:%d (%##s)", - q->unansweredQueries, q->qname.c, DNSTypeName(q->qtype), &orig->addr, mDNSVal16(orig->port), orig->domain.c); - - PenalizeDNSServer(m, q); - q->noServerResponse = 1; - } - // There are two cases here. - // - // 1. We have only one DNS server for this question. It is not responding even after we sent MAX_UCAST_UNANSWERED_QUERIES. - // In that case, we need to keep retrying till we get a response. But we need to backoff as we retry. We set - // noServerResponse in the block above and below we do not touch the question interval. When we come here, we - // already waited for the response. We need to send another query right at this moment. We do that below by - // reinitializing dns servers and reissuing the query. - // - // 2. We have more than one DNS server. If at least one server did not respond, we would have set noServerResponse - // either now (the last server in the list) or before (non-last server in the list). In either case, if we have - // reached the end of DNS server list, we need to try again from the beginning. Ideally we should try just the - // servers that did not respond, but for simplicity we try all the servers. Once we reached the end of list, we - // set triedAllServersOnce so that we don't try all the servers aggressively. See PenalizeDNSServer. - if (!q->qDNSServer && q->noServerResponse) - { - DNSServer *new; - DNSQuestion *qptr; - q->triedAllServersOnce = 1; - // Re-initialize all DNS servers for this question. If we have a DNSServer, DNSServerChangeForQuestion will - // handle all the work including setting the new DNS server. - SetValidDNSServers(m, q); - new = GetServerForQuestion(m, q); - if (new) - { - LogInfo("uDNS_checkCurrentQuestion: Retrying question %p %##s (%s) DNS Server %#a:%d ThisQInterval %d", - q, q->qname.c, DNSTypeName(q->qtype), new ? &new->addr : mDNSNULL, mDNSVal16(new ? new->port : zeroIPPort), q->ThisQInterval); - DNSServerChangeForQuestion(m, q, new); - } - for (qptr = q->next ; qptr; qptr = qptr->next) - if (qptr->DuplicateOf == q) { qptr->validDNSServers = q->validDNSServers; qptr->qDNSServer = q->qDNSServer; } - } - if (q->qDNSServer && q->qDNSServer->teststate != DNSServer_Disabled) - { - mDNSu8 *end = m->omsg.data; - mStatus err = mStatus_NoError; - mDNSBool private = mDNSfalse; - - InitializeDNSMessage(&m->omsg.h, q->TargetQID, uQueryFlags); - - if (q->qDNSServer->teststate != DNSServer_Untested || NoTestQuery(q)) - { - end = putQuestion(&m->omsg, m->omsg.data, m->omsg.data + AbsoluteMaxDNSMessageData, &q->qname, q->qtype, q->qclass); - private = PrivateQuery(q); - } - else if (m->timenow - q->qDNSServer->lasttest >= INIT_UCAST_POLL_INTERVAL) // Make sure at least three seconds has elapsed since last test query - { - LogInfo("Sending DNS test query to %#a:%d", &q->qDNSServer->addr, mDNSVal16(q->qDNSServer->port)); - q->ThisQInterval = INIT_UCAST_POLL_INTERVAL / QuestionIntervalStep; - q->qDNSServer->lasttest = m->timenow; - end = putQuestion(&m->omsg, m->omsg.data, m->omsg.data + AbsoluteMaxDNSMessageData, DNSRelayTestQuestion, kDNSType_PTR, kDNSClass_IN); - q->qDNSServer->testid = m->omsg.h.id; - } - - if (end > m->omsg.data && (q->qDNSServer->teststate != DNSServer_Failed || NoTestQuery(q))) - { - //LogMsg("uDNS_CheckCurrentQuestion %p %d %p %##s (%s)", q, NextQSendTime(q) - m->timenow, private, q->qname.c, DNSTypeName(q->qtype)); - if (private) - { - if (q->nta) CancelGetZoneData(m, q->nta); - q->nta = StartGetZoneData(m, &q->qname, q->LongLived ? ZoneServiceLLQ : ZoneServiceQuery, PrivateQueryGotZoneData, q); - if (q->state == LLQ_Poll) q->ThisQInterval = (LLQ_POLL_INTERVAL + mDNSRandom(LLQ_POLL_INTERVAL/10)) / QuestionIntervalStep; - } - else - { - debugf("uDNS_CheckCurrentQuestion sending %p %##s (%s) %#a:%d UnansweredQueries %d", - q, q->qname.c, DNSTypeName(q->qtype), - q->qDNSServer ? &q->qDNSServer->addr : mDNSNULL, mDNSVal16(q->qDNSServer ? q->qDNSServer->port : zeroIPPort), q->unansweredQueries); - if (!q->LocalSocket) q->LocalSocket = mDNSPlatformUDPSocket(m, zeroIPPort); - if (!q->LocalSocket) err = mStatus_NoMemoryErr; // If failed to make socket (should be very rare), we'll try again next time - else err = mDNSSendDNSMessage(m, &m->omsg, end, q->qDNSServer->interface, q->LocalSocket, &q->qDNSServer->addr, q->qDNSServer->port, mDNSNULL, mDNSNULL); - } - } - - if (err) debugf("ERROR: uDNS_idle - mDNSSendDNSMessage - %d", err); // surpress syslog messages if we have no network - else - { - q->ThisQInterval = q->ThisQInterval * QuestionIntervalStep; // Only increase interval if send succeeded - q->unansweredQueries++; - if (q->ThisQInterval > MAX_UCAST_POLL_INTERVAL) - q->ThisQInterval = MAX_UCAST_POLL_INTERVAL; - if (private && q->state != LLQ_Poll) - { - // We don't want to retransmit too soon. Hence, we always schedule our first - // retransmisson at 3 seconds rather than one second - if (q->ThisQInterval < (3 * mDNSPlatformOneSecond)) - q->ThisQInterval = q->ThisQInterval * QuestionIntervalStep; - if (q->ThisQInterval > LLQ_POLL_INTERVAL) - q->ThisQInterval = LLQ_POLL_INTERVAL; - LogInfo("uDNS_CheckCurrentQuestion: private non polling question for %##s (%s) will be retried in %d ms", q->qname.c, DNSTypeName(q->qtype), q->ThisQInterval); - } - if (q->qDNSServer->cellIntf) - { - // We don't want to retransmit too soon. Schedule our first retransmisson at - // MIN_UCAST_RETRANS_TIMEOUT seconds. - if (q->ThisQInterval < MIN_UCAST_RETRANS_TIMEOUT) - q->ThisQInterval = MIN_UCAST_RETRANS_TIMEOUT; - } - debugf("uDNS_CheckCurrentQuestion: Increased ThisQInterval to %d for %##s (%s), cell %d", q->ThisQInterval, q->qname.c, DNSTypeName(q->qtype), q->qDNSServer->cellIntf); - } - q->LastQTime = m->timenow; - SetNextQueryTime(m, q); - } - else - { - // If we have no server for this query, or the only server is a disabled one, then we deliver - // a transient failure indication to the client. This is important for things like iPhone - // where we want to return timely feedback to the user when no network is available. - // After calling MakeNegativeCacheRecord() we store the resulting record in the - // cache so that it will be visible to other clients asking the same question. - // (When we have a group of identical questions, only the active representative of the group gets - // passed to uDNS_CheckCurrentQuestion -- we only want one set of query packets hitting the wire -- - // but we want *all* of the questions to get answer callbacks.) - - CacheRecord *rr; - const mDNSu32 slot = HashSlot(&q->qname); - CacheGroup *const cg = CacheGroupForName(m, slot, q->qnamehash, &q->qname); - if (cg) - for (rr = cg->members; rr; rr=rr->next) - if (SameNameRecordAnswersQuestion(&rr->resrec, q)) mDNS_PurgeCacheResourceRecord(m, rr); - - if (!q->qDNSServer) - { - if (!mDNSOpaque64IsZero(&q->validDNSServers)) - LogMsg("uDNS_CheckCurrentQuestion: ERROR!!: valid DNSServer bits not zero 0x%x, 0x%x for question %##s (%s)", - q->validDNSServers.l[1], q->validDNSServers.l[0], q->qname.c, DNSTypeName(q->qtype)); - // If we reached the end of list while picking DNS servers, then we don't want to deactivate the - // question. Try after 60 seconds. We find this by looking for valid DNSServers for this question, - // if we find any, then we must have tried them before we came here. This avoids maintaining - // another state variable to see if we had valid DNS servers for this question. - SetValidDNSServers(m, q); - if (mDNSOpaque64IsZero(&q->validDNSServers)) - { - LogInfo("uDNS_CheckCurrentQuestion: no DNS server for %##s (%s)", q->qname.c, DNSTypeName(q->qtype)); - q->ThisQInterval = 0; - } - else - { - DNSQuestion *qptr; - // Pretend that we sent this question. As this is an ActiveQuestion, the NextScheduledQuery should - // be set properly. Also, we need to properly backoff in cases where we don't set the question to - // MaxQuestionInterval when we answer the question e.g., LongLived, we need to keep backing off - q->ThisQInterval = q->ThisQInterval * QuestionIntervalStep; - q->LastQTime = m->timenow; - SetNextQueryTime(m, q); - // Pick a new DNS server now. Otherwise, when the cache is 80% of its expiry, we will try - // to send a query and come back to the same place here and log the above message. - q->qDNSServer = GetServerForQuestion(m, q); - for (qptr = q->next ; qptr; qptr = qptr->next) - if (qptr->DuplicateOf == q) { qptr->validDNSServers = q->validDNSServers; qptr->qDNSServer = q->qDNSServer; } - LogInfo("uDNS_checkCurrentQuestion: Tried all DNS servers, retry question %p SuppressUnusable %d %##s (%s) with DNS Server %#a:%d after 60 seconds, ThisQInterval %d", - q, q->SuppressUnusable, q->qname.c, DNSTypeName(q->qtype), - q->qDNSServer ? &q->qDNSServer->addr : mDNSNULL, mDNSVal16(q->qDNSServer ? q->qDNSServer->port : zeroIPPort), q->ThisQInterval); - } - } - else - { - q->ThisQInterval = 0; - LogMsg("uDNS_CheckCurrentQuestion DNS server %#a:%d for %##s is disabled", &q->qDNSServer->addr, mDNSVal16(q->qDNSServer->port), q->qname.c); - } - - // For some of the WAB queries that we generate form within the mDNSResponder, most of the home routers - // don't understand and return ServFail/NXDomain. In those cases, we don't want to try too often. We try - // every fifteen minutes in that case - MakeNegativeCacheRecord(m, &m->rec.r, &q->qname, q->qnamehash, q->qtype, q->qclass, (DomainEnumQuery(&q->qname) ? 60 * 15 : 60), mDNSInterface_Any, q->qDNSServer); - q->unansweredQueries = 0; - // We're already using the m->CurrentQuestion pointer, so CacheRecordAdd can't use it to walk the question list. - // To solve this problem we set rr->DelayDelivery to a nonzero value (which happens to be 'now') so that we - // momentarily defer generating answer callbacks until mDNS_Execute time. - CreateNewCacheEntry(m, slot, cg, NonZeroTime(m->timenow)); - ScheduleNextCacheCheckTime(m, slot, NonZeroTime(m->timenow)); - m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it - // MUST NOT touch m->CurrentQuestion (or q) after this -- client callback could have deleted it - } - } - } - -mDNSexport void CheckNATMappings(mDNS *m) - { - mStatus err = mStatus_NoError; - mDNSBool rfc1918 = mDNSv4AddrIsRFC1918(&m->AdvertisedV4.ip.v4); - mDNSBool HaveRoutable = !rfc1918 && !mDNSIPv4AddressIsZero(m->AdvertisedV4.ip.v4); - m->NextScheduledNATOp = m->timenow + 0x3FFFFFFF; - - if (HaveRoutable) m->ExternalAddress = m->AdvertisedV4.ip.v4; - - if (m->NATTraversals && rfc1918) // Do we need to open NAT-PMP socket to receive multicast announcements from router? - { - if (m->NATMcastRecvskt == mDNSNULL) // If we are behind a NAT and the socket hasn't been opened yet, open it - { - // we need to log a message if we can't get our socket, but only the first time (after success) - static mDNSBool needLog = mDNStrue; - m->NATMcastRecvskt = mDNSPlatformUDPSocket(m, NATPMPAnnouncementPort); - if (!m->NATMcastRecvskt) - { - if (needLog) - { - LogMsg("CheckNATMappings: Failed to allocate port 5350 UDP multicast socket for NAT-PMP announcements"); - needLog = mDNSfalse; - } - } - else - needLog = mDNStrue; - } - } - else // else, we don't want to listen for announcements, so close them if they're open - { - if (m->NATMcastRecvskt) { mDNSPlatformUDPClose(m->NATMcastRecvskt); m->NATMcastRecvskt = mDNSNULL; } - if (m->SSDPSocket) { debugf("CheckNATMappings destroying SSDPSocket %p", &m->SSDPSocket); mDNSPlatformUDPClose(m->SSDPSocket); m->SSDPSocket = mDNSNULL; } - } - - if (!m->NATTraversals) - m->retryGetAddr = m->timenow + 0x78000000; - else - { - if (m->timenow - m->retryGetAddr >= 0) - { - err = uDNS_SendNATMsg(m, mDNSNULL); // Will also do UPnP discovery for us, if necessary - if (!err) - { - if (m->retryIntervalGetAddr < NATMAP_INIT_RETRY) m->retryIntervalGetAddr = NATMAP_INIT_RETRY; - else if (m->retryIntervalGetAddr < NATMAP_MAX_RETRY_INTERVAL / 2) m->retryIntervalGetAddr *= 2; - else m->retryIntervalGetAddr = NATMAP_MAX_RETRY_INTERVAL; - } - LogInfo("CheckNATMappings retryGetAddr sent address request err %d interval %d", err, m->retryIntervalGetAddr); - - // Always update m->retryGetAddr, even if we fail to send the packet. Otherwise in cases where we can't send the packet - // (like when we have no active interfaces) we'll spin in an infinite loop repeatedly failing to send the packet - m->retryGetAddr = m->timenow + m->retryIntervalGetAddr; - } - // Even when we didn't send the GetAddr packet, still need to make sure NextScheduledNATOp is set correctly - if (m->NextScheduledNATOp - m->retryGetAddr > 0) - m->NextScheduledNATOp = m->retryGetAddr; - } - - if (m->CurrentNATTraversal) LogMsg("WARNING m->CurrentNATTraversal already in use"); - m->CurrentNATTraversal = m->NATTraversals; - - while (m->CurrentNATTraversal) - { - NATTraversalInfo *cur = m->CurrentNATTraversal; - m->CurrentNATTraversal = m->CurrentNATTraversal->next; - - if (HaveRoutable) // If not RFC 1918 address, our own address and port are effectively our external address and port - { - cur->ExpiryTime = 0; - cur->NewResult = mStatus_NoError; - } - else if (cur->Protocol) // Check if it's time to send port mapping packets - { - if (m->timenow - cur->retryPortMap >= 0) // Time to do something with this mapping - { - if (cur->ExpiryTime && cur->ExpiryTime - m->timenow < 0) // Mapping has expired - { - cur->ExpiryTime = 0; - cur->retryInterval = NATMAP_INIT_RETRY; - } - - //LogMsg("uDNS_SendNATMsg"); - err = uDNS_SendNATMsg(m, cur); - - if (cur->ExpiryTime) // If have active mapping then set next renewal time halfway to expiry - NATSetNextRenewalTime(m, cur); - else // else no mapping; use exponential backoff sequence - { - if (cur->retryInterval < NATMAP_INIT_RETRY ) cur->retryInterval = NATMAP_INIT_RETRY; - else if (cur->retryInterval < NATMAP_MAX_RETRY_INTERVAL / 2) cur->retryInterval *= 2; - else cur->retryInterval = NATMAP_MAX_RETRY_INTERVAL; - cur->retryPortMap = m->timenow + cur->retryInterval; - } - } - - if (m->NextScheduledNATOp - cur->retryPortMap > 0) - m->NextScheduledNATOp = cur->retryPortMap; - } - - // Notify the client if necessary. We invoke the callback if: - // (1) we have an ExternalAddress, or we've tried and failed a couple of times to discover it - // and (2) the client doesn't want a mapping, or the client won't need a mapping, or the client has a successful mapping, or we've tried and failed a couple of times - // and (3) we have new data to give the client that's changed since the last callback - // Time line is: Send, Wait 500ms, Send, Wait 1sec, Send, Wait 2sec, Send - // At this point we've sent three requests without an answer, we've just sent our fourth request, - // retryIntervalGetAddr is now 4 seconds, which is greater than NATMAP_INIT_RETRY * 8 (2 seconds), - // so we return an error result to the caller. - if (!mDNSIPv4AddressIsZero(m->ExternalAddress) || m->retryIntervalGetAddr > NATMAP_INIT_RETRY * 8) - { - const mStatus EffectiveResult = cur->NewResult ? cur->NewResult : mDNSv4AddrIsRFC1918(&m->ExternalAddress) ? mStatus_DoubleNAT : mStatus_NoError; - const mDNSIPPort ExternalPort = HaveRoutable ? cur->IntPort : - !mDNSIPv4AddressIsZero(m->ExternalAddress) && cur->ExpiryTime ? cur->RequestedPort : zeroIPPort; - if (!cur->Protocol || HaveRoutable || cur->ExpiryTime || cur->retryInterval > NATMAP_INIT_RETRY * 8) - if (!mDNSSameIPv4Address(cur->ExternalAddress, m->ExternalAddress) || - !mDNSSameIPPort (cur->ExternalPort, ExternalPort) || - cur->Result != EffectiveResult) - { - //LogMsg("NAT callback %d %d %d", cur->Protocol, cur->ExpiryTime, cur->retryInterval); - if (cur->Protocol && mDNSIPPortIsZero(ExternalPort) && !mDNSIPv4AddressIsZero(m->Router.ip.v4)) - { - if (!EffectiveResult) - LogInfo("CheckNATMapping: Failed to obtain NAT port mapping %p from router %#a external address %.4a internal port %5d interval %d error %d", - cur, &m->Router, &m->ExternalAddress, mDNSVal16(cur->IntPort), cur->retryInterval, EffectiveResult); - else - LogMsg("CheckNATMapping: Failed to obtain NAT port mapping %p from router %#a external address %.4a internal port %5d interval %d error %d", - cur, &m->Router, &m->ExternalAddress, mDNSVal16(cur->IntPort), cur->retryInterval, EffectiveResult); - } - - cur->ExternalAddress = m->ExternalAddress; - cur->ExternalPort = ExternalPort; - cur->Lifetime = cur->ExpiryTime && !mDNSIPPortIsZero(ExternalPort) ? - (cur->ExpiryTime - m->timenow + mDNSPlatformOneSecond/2) / mDNSPlatformOneSecond : 0; - cur->Result = EffectiveResult; - mDNS_DropLockBeforeCallback(); // Allow client to legally make mDNS API calls from the callback - if (cur->clientCallback) - cur->clientCallback(m, cur); - mDNS_ReclaimLockAfterCallback(); // Decrement mDNS_reentrancy to block mDNS API calls again - // MUST NOT touch cur after invoking the callback - } - } - } - } - -mDNSlocal mDNSs32 CheckRecordUpdates(mDNS *m) - { - AuthRecord *rr; - mDNSs32 nextevent = m->timenow + 0x3FFFFFFF; - - CheckGroupRecordUpdates(m); - - for (rr = m->ResourceRecords; rr; rr = rr->next) - { - if (!AuthRecord_uDNS(rr)) continue; - if (rr->state == regState_NoTarget) {debugf("CheckRecordUpdates: Record %##s in NoTarget", rr->resrec.name->c); continue;} - // While we are waiting for the port mapping, we have nothing to do. The port mapping callback - // will take care of this - if (rr->state == regState_NATMap) {debugf("CheckRecordUpdates: Record %##s in NATMap", rr->resrec.name->c); continue;} - if (rr->state == regState_Pending || rr->state == regState_DeregPending || rr->state == regState_UpdatePending || - rr->state == regState_Refresh || rr->state == regState_Registered) - { - if (rr->LastAPTime + rr->ThisAPInterval - m->timenow <= 0) - { - if (rr->tcp) { DisposeTCPConn(rr->tcp); rr->tcp = mDNSNULL; } - if (!rr->nta || mDNSIPv4AddressIsZero(rr->nta->Addr.ip.v4)) - { - // Zero out the updateid so that if we have a pending response from the server, it won't - // be accepted as a valid response. If we accept the response, we might free the new "nta" - if (rr->nta) { rr->updateid = zeroID; CancelGetZoneData(m, rr->nta); } - rr->nta = StartGetZoneData(m, rr->resrec.name, ZoneServiceUpdate, RecordRegistrationGotZoneData, rr); - - // We have just started the GetZoneData. We need to wait for it to finish. SetRecordRetry here - // schedules the update timer to fire in the future. - // - // There are three cases. - // - // 1) When the updates are sent the first time, the first retry is intended to be at three seconds - // in the future. But by calling SetRecordRetry here we set it to nine seconds. But it does not - // matter because when the answer comes back, RecordRegistrationGotZoneData resets the interval - // back to INIT_RECORD_REG_INTERVAL. This also gives enough time for the query. - // - // 2) In the case of update errors (updateError), this causes further backoff as - // RecordRegistrationGotZoneData does not reset the timer. This is intentional as in the case of - // errors, we don't want to update aggressively. - // - // 3) We might be refreshing the update. This is very similar to case (1). RecordRegistrationGotZoneData - // resets it back to INIT_RECORD_REG_INTERVAL. - // - SetRecordRetry(m, rr, 0); - } - else if (rr->state == regState_DeregPending) SendRecordDeregistration(m, rr); - else SendRecordRegistration(m, rr); - } - } - if (nextevent - (rr->LastAPTime + rr->ThisAPInterval) > 0) - nextevent = (rr->LastAPTime + rr->ThisAPInterval); - } - return nextevent; - } - -mDNSexport void uDNS_Tasks(mDNS *const m) - { - mDNSs32 nexte; - DNSServer *d; - - m->NextuDNSEvent = m->timenow + 0x3FFFFFFF; - - nexte = CheckRecordUpdates(m); - if (m->NextuDNSEvent - nexte > 0) - m->NextuDNSEvent = nexte; - - for (d = m->DNSServers; d; d=d->next) - if (d->penaltyTime) - { - if (m->timenow - d->penaltyTime >= 0) - { - LogInfo("DNS server %#a:%d out of penalty box", &d->addr, mDNSVal16(d->port)); - d->penaltyTime = 0; - } - else - if (m->NextuDNSEvent - d->penaltyTime > 0) - m->NextuDNSEvent = d->penaltyTime; - } - - if (m->CurrentQuestion) - LogMsg("uDNS_Tasks ERROR m->CurrentQuestion already set: %##s (%s)", m->CurrentQuestion->qname.c, DNSTypeName(m->CurrentQuestion->qtype)); - m->CurrentQuestion = m->Questions; - while (m->CurrentQuestion && m->CurrentQuestion != m->NewQuestions) - { - DNSQuestion *const q = m->CurrentQuestion; - if (ActiveQuestion(q) && !mDNSOpaque16IsZero(q->TargetQID)) - { - uDNS_CheckCurrentQuestion(m); - if (q == m->CurrentQuestion) - if (m->NextuDNSEvent - NextQSendTime(q) > 0) - m->NextuDNSEvent = NextQSendTime(q); - } - // If m->CurrentQuestion wasn't modified out from under us, advance it now - // We can't do this at the start of the loop because uDNS_CheckCurrentQuestion() - // depends on having m->CurrentQuestion point to the right question - if (m->CurrentQuestion == q) - m->CurrentQuestion = q->next; - } - m->CurrentQuestion = mDNSNULL; - } - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - Startup, Shutdown, and Sleep -#endif - -mDNSexport void SleepRecordRegistrations(mDNS *m) - { - AuthRecord *rr; - for (rr = m->ResourceRecords; rr; rr=rr->next) - { - if (AuthRecord_uDNS(rr)) - { - // Zero out the updateid so that if we have a pending response from the server, it won't - // be accepted as a valid response. - if (rr->nta) { rr->updateid = zeroID; CancelGetZoneData(m, rr->nta); rr->nta = mDNSNULL; } - - if (rr->NATinfo.clientContext) - { - mDNS_StopNATOperation_internal(m, &rr->NATinfo); - rr->NATinfo.clientContext = mDNSNULL; - } - // We are waiting to update the resource record. The original data of the record is - // in OrigRData and the updated value is in InFlightRData. Free the old and the new - // one will be registered when we come back. - if (rr->state == regState_UpdatePending) - { - // act as if the update succeeded, since we're about to delete the name anyway - rr->state = regState_Registered; - // deallocate old RData - if (rr->UpdateCallback) rr->UpdateCallback(m, rr, rr->OrigRData, rr->OrigRDLen); - SetNewRData(&rr->resrec, rr->InFlightRData, rr->InFlightRDLen); - rr->OrigRData = mDNSNULL; - rr->InFlightRData = mDNSNULL; - } - - // If we have not begun the registration process i.e., never sent a registration packet, - // then uDNS_DeregisterRecord will not send a deregistration - uDNS_DeregisterRecord(m, rr); - - // When we wake, we call ActivateUnicastRegistration which starts at StartGetZoneData - } - } - } - -mDNSexport void mDNS_AddSearchDomain(const domainname *const domain, mDNSInterfaceID InterfaceID) - { - SearchListElem **p; - SearchListElem *tmp = mDNSNULL; - - // Check to see if we already have this domain in our list - for (p = &SearchList; *p; p = &(*p)->next) - if (((*p)->InterfaceID == InterfaceID) && SameDomainName(&(*p)->domain, domain)) - { - // If domain is already in list, and marked for deletion, unmark the delete - // Be careful not to touch the other flags that may be present - LogInfo("mDNS_AddSearchDomain already in list %##s", domain->c); - if ((*p)->flag & SLE_DELETE) (*p)->flag &= ~SLE_DELETE; - tmp = *p; - *p = tmp->next; - tmp->next = mDNSNULL; - break; - } - - - // move to end of list so that we maintain the same order - while (*p) p = &(*p)->next; - - if (tmp) *p = tmp; - else - { - // if domain not in list, add to list, mark as add (1) - *p = mDNSPlatformMemAllocate(sizeof(SearchListElem)); - if (!*p) { LogMsg("ERROR: mDNS_AddSearchDomain - malloc"); return; } - mDNSPlatformMemZero(*p, sizeof(SearchListElem)); - AssignDomainName(&(*p)->domain, domain); - (*p)->next = mDNSNULL; - (*p)->InterfaceID = InterfaceID; - LogInfo("mDNS_AddSearchDomain created new %##s, InterfaceID %p", domain->c, InterfaceID); - } - } - -mDNSlocal void FreeARElemCallback(mDNS *const m, AuthRecord *const rr, mStatus result) - { - (void)m; // unused - if (result == mStatus_MemFree) mDNSPlatformMemFree(rr->RecordContext); - } - -mDNSlocal void FoundDomain(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, QC_result AddRecord) - { - SearchListElem *slElem = question->QuestionContext; - mStatus err; - const char *name; - - if (answer->rrtype != kDNSType_PTR) return; - if (answer->RecordType == kDNSRecordTypePacketNegative) return; - if (answer->InterfaceID == mDNSInterface_LocalOnly) return; - - if (question == &slElem->BrowseQ) name = mDNS_DomainTypeNames[mDNS_DomainTypeBrowse]; - else if (question == &slElem->DefBrowseQ) name = mDNS_DomainTypeNames[mDNS_DomainTypeBrowseDefault]; - else if (question == &slElem->AutomaticBrowseQ) name = mDNS_DomainTypeNames[mDNS_DomainTypeBrowseAutomatic]; - else if (question == &slElem->RegisterQ) name = mDNS_DomainTypeNames[mDNS_DomainTypeRegistration]; - else if (question == &slElem->DefRegisterQ) name = mDNS_DomainTypeNames[mDNS_DomainTypeRegistrationDefault]; - else { LogMsg("FoundDomain - unknown question"); return; } - - LogInfo("FoundDomain: %p %s %s Q %##s A %s", answer->InterfaceID, AddRecord ? "Add" : "Rmv", name, question->qname.c, RRDisplayString(m, answer)); - - if (AddRecord) - { - ARListElem *arElem = mDNSPlatformMemAllocate(sizeof(ARListElem)); - if (!arElem) { LogMsg("ERROR: FoundDomain out of memory"); return; } - mDNS_SetupResourceRecord(&arElem->ar, mDNSNULL, mDNSInterface_LocalOnly, kDNSType_PTR, 7200, kDNSRecordTypeShared, AuthRecordLocalOnly, FreeARElemCallback, arElem); - MakeDomainNameFromDNSNameString(&arElem->ar.namestorage, name); - AppendDNSNameString (&arElem->ar.namestorage, "local"); - AssignDomainName(&arElem->ar.resrec.rdata->u.name, &answer->rdata->u.name); - LogInfo("FoundDomain: Registering %s", ARDisplayString(m, &arElem->ar)); - err = mDNS_Register(m, &arElem->ar); - if (err) { LogMsg("ERROR: FoundDomain - mDNS_Register returned %d", err); mDNSPlatformMemFree(arElem); return; } - arElem->next = slElem->AuthRecs; - slElem->AuthRecs = arElem; - } - else - { - ARListElem **ptr = &slElem->AuthRecs; - while (*ptr) - { - if (SameDomainName(&(*ptr)->ar.resrec.rdata->u.name, &answer->rdata->u.name)) - { - ARListElem *dereg = *ptr; - *ptr = (*ptr)->next; - LogInfo("FoundDomain: Deregistering %s", ARDisplayString(m, &dereg->ar)); - err = mDNS_Deregister(m, &dereg->ar); - if (err) LogMsg("ERROR: FoundDomain - mDNS_Deregister returned %d", err); - // Memory will be freed in the FreeARElemCallback - } - else - ptr = &(*ptr)->next; - } - } - } - -#if APPLE_OSX_mDNSResponder && MACOSX_MDNS_MALLOC_DEBUGGING -mDNSexport void udns_validatelists(void *const v) - { - mDNS *const m = v; - - NATTraversalInfo *n; - for (n = m->NATTraversals; n; n=n->next) - if (n->next == (NATTraversalInfo *)~0 || n->clientCallback == (NATTraversalClientCallback)~0) - LogMemCorruption("m->NATTraversals: %p is garbage", n); - - DNSServer *d; - for (d = m->DNSServers; d; d=d->next) - if (d->next == (DNSServer *)~0 || d->teststate > DNSServer_Disabled) - LogMemCorruption("m->DNSServers: %p is garbage (%d)", d, d->teststate); - - DomainAuthInfo *info; - for (info = m->AuthInfoList; info; info = info->next) - if (info->next == (DomainAuthInfo *)~0 || info->AutoTunnel == (const char*)~0) - LogMemCorruption("m->AuthInfoList: %p is garbage (%X)", info, info->AutoTunnel); - - HostnameInfo *hi; - for (hi = m->Hostnames; hi; hi = hi->next) - if (hi->next == (HostnameInfo *)~0 || hi->StatusCallback == (mDNSRecordCallback*)~0) - LogMemCorruption("m->Hostnames: %p is garbage", n); - - SearchListElem *ptr; - for (ptr = SearchList; ptr; ptr = ptr->next) - if (ptr->next == (SearchListElem *)~0 || ptr->AuthRecs == (void*)~0) - LogMemCorruption("SearchList: %p is garbage (%X)", ptr, ptr->AuthRecs); - } -#endif - -// This should probably move to the UDS daemon -- the concept of legacy clients and automatic registration / automatic browsing -// is really a UDS API issue, not something intrinsic to uDNS - -mDNSexport mStatus uDNS_SetupSearchDomains(mDNS *const m, int action) - { - SearchListElem **p = &SearchList, *ptr; - mStatus err; - - // step 1: mark each element for removal - for (ptr = SearchList; ptr; ptr = ptr->next) ptr->flag |= SLE_DELETE; - - // Make sure we have the search domains from the platform layer so that if we start the WAB - // queries below, we have the latest information - mDNS_Lock(m); - mDNSPlatformSetDNSConfig(m, mDNSfalse, mDNStrue, mDNSNULL, mDNSNULL, mDNSNULL); - mDNS_Unlock(m); - - if (action & UDNS_START_WAB_QUERY) - m->StartWABQueries = mDNStrue; - - // delete elems marked for removal, do queries for elems marked add - while (*p) - { - ptr = *p; - LogInfo("uDNS_SetupSearchDomains:action %d: Flags %d, AuthRecs %p, InterfaceID %p %##s", action, ptr->flag, ptr->AuthRecs, ptr->InterfaceID, ptr->domain.c); - if (ptr->flag & SLE_DELETE) - { - ARListElem *arList = ptr->AuthRecs; - ptr->AuthRecs = mDNSNULL; - *p = ptr->next; - - // If the user has "local" in their DNS searchlist, we ignore that for the purposes of domain enumeration queries - // We suppressed the domain enumeration for scoped search domains below. When we enable that - // enable this. - if ((ptr->flag & SLE_WAB_QUERY_STARTED) && - !SameDomainName(&ptr->domain, &localdomain) && (ptr->InterfaceID == mDNSInterface_Any)) - { - mDNS_StopGetDomains(m, &ptr->BrowseQ); - mDNS_StopGetDomains(m, &ptr->RegisterQ); - mDNS_StopGetDomains(m, &ptr->DefBrowseQ); - mDNS_StopGetDomains(m, &ptr->DefRegisterQ); - mDNS_StopGetDomains(m, &ptr->AutomaticBrowseQ); - } - - mDNSPlatformMemFree(ptr); - - // deregister records generated from answers to the query - while (arList) - { - ARListElem *dereg = arList; - arList = arList->next; - debugf("Deregistering PTR %##s -> %##s", dereg->ar.resrec.name->c, dereg->ar.resrec.rdata->u.name.c); - err = mDNS_Deregister(m, &dereg->ar); - if (err) LogMsg("uDNS_SetupSearchDomains:: ERROR!! mDNS_Deregister returned %d", err); - // Memory will be freed in the FreeARElemCallback - } - continue; - } - - if ((action & UDNS_START_WAB_QUERY) && !(ptr->flag & SLE_WAB_QUERY_STARTED)) - { - // If the user has "local" in their DNS searchlist, we ignore that for the purposes of domain enumeration queries. - // Also, suppress the domain enumeration for scoped search domains for now until there is a need. - if (!SameDomainName(&ptr->domain, &localdomain) && (ptr->InterfaceID == mDNSInterface_Any)) - { - mStatus err1, err2, err3, err4, err5; - err1 = mDNS_GetDomains(m, &ptr->BrowseQ, mDNS_DomainTypeBrowse, &ptr->domain, ptr->InterfaceID, FoundDomain, ptr); - err2 = mDNS_GetDomains(m, &ptr->DefBrowseQ, mDNS_DomainTypeBrowseDefault, &ptr->domain, ptr->InterfaceID, FoundDomain, ptr); - err3 = mDNS_GetDomains(m, &ptr->RegisterQ, mDNS_DomainTypeRegistration, &ptr->domain, ptr->InterfaceID, FoundDomain, ptr); - err4 = mDNS_GetDomains(m, &ptr->DefRegisterQ, mDNS_DomainTypeRegistrationDefault, &ptr->domain, ptr->InterfaceID, FoundDomain, ptr); - err5 = mDNS_GetDomains(m, &ptr->AutomaticBrowseQ, mDNS_DomainTypeBrowseAutomatic, &ptr->domain, ptr->InterfaceID, FoundDomain, ptr); - if (err1 || err2 || err3 || err4 || err5) - LogMsg("uDNS_SetupSearchDomains: GetDomains for domain %##s returned error(s):\n" - "%d (mDNS_DomainTypeBrowse)\n" - "%d (mDNS_DomainTypeBrowseDefault)\n" - "%d (mDNS_DomainTypeRegistration)\n" - "%d (mDNS_DomainTypeRegistrationDefault)" - "%d (mDNS_DomainTypeBrowseAutomatic)\n", - ptr->domain.c, err1, err2, err3, err4, err5); - ptr->flag |= SLE_WAB_QUERY_STARTED; - } - } - - p = &ptr->next; - } - return mStatus_NoError; - } - -mDNSexport domainname *uDNS_GetNextSearchDomain(mDNS *const m, mDNSInterfaceID InterfaceID, mDNSs8 *searchIndex, mDNSBool ignoreDotLocal) - { - SearchListElem *p = SearchList; - int count = *searchIndex; - (void) m; // unused - - if (count < 0) { LogMsg("uDNS_GetNextSearchDomain: count %d less than zero", count); return mDNSNULL; } - - // skip the domains that we already looked at before - for (; count; count--) p = p->next; - - while (p) - { - int labels = CountLabels(&p->domain); - if (labels > 0) - { - const domainname *d = SkipLeadingLabels(&p->domain, labels - 1); - if (SameDomainLabel(d->c, (const mDNSu8 *)"\x4""arpa")) - { - LogInfo("uDNS_GetNextSearchDomain: skipping search domain %##s, InterfaceID %p", p->domain.c, p->InterfaceID); - (*searchIndex)++; - p = p->next; - continue; - } - if (ignoreDotLocal && SameDomainLabel(d->c, (const mDNSu8 *)"\x5""local")) - { - LogInfo("uDNS_GetNextSearchDomain: skipping local domain %##s, InterfaceID %p", p->domain.c, p->InterfaceID); - (*searchIndex)++; - p = p->next; - continue; - } - } - // Point to the next one in the list which we will look at next time. - (*searchIndex)++; - // When we are appending search domains in a ActiveDirectory domain, the question's InterfaceID - // set to mDNSInterface_Unicast. Match the unscoped entries in that case. - if (((InterfaceID == mDNSInterface_Unicast) && (p->InterfaceID == mDNSInterface_Any)) || - p->InterfaceID == InterfaceID) - { - LogInfo("uDNS_GetNextSearchDomain returning domain %##s, InterfaceID %p", p->domain.c, p->InterfaceID); - return &p->domain; - } - LogInfo("uDNS_GetNextSearchDomain skipping domain %##s, InterfaceID %p", p->domain.c, p->InterfaceID); - p = p->next; - } - return mDNSNULL; - } - -mDNSlocal void FlushAddressCacheRecords(mDNS *const m) - { - mDNSu32 slot; - CacheGroup *cg; - CacheRecord *cr; - FORALL_CACHERECORDS(slot, cg, cr) - { - if (cr->resrec.InterfaceID) continue; - - // If a resource record can answer A or AAAA, they need to be flushed so that we will - // never used to deliver an ADD or RMV - if (RRTypeAnswersQuestionType(&cr->resrec, kDNSType_A) || - RRTypeAnswersQuestionType(&cr->resrec, kDNSType_AAAA)) - { - LogInfo("FlushAddressCacheRecords: Purging Resourcerecord %s", CRDisplayString(m, cr)); - mDNS_PurgeCacheResourceRecord(m, cr); - } - } - } - -// Retry questions which has seach domains appended -mDNSexport void RetrySearchDomainQuestions(mDNS *const m) - { - // Purge all the A/AAAA cache records and restart the queries. mDNSCoreRestartAddressQueries - // does this. When we restart the question, we first want to try the new search domains rather - // than use the entries that is already in the cache. When we appended search domains, we might - // have created cache entries which is no longer valid as there are new search domains now - - LogInfo("RetrySearchDomainQuestions: Calling mDNSCoreRestartAddressQueries"); - mDNSCoreRestartAddressQueries(m, mDNStrue, FlushAddressCacheRecords, mDNSNULL, mDNSNULL); - } - -// Construction of Default Browse domain list (i.e. when clients pass NULL) is as follows: -// 1) query for b._dns-sd._udp.local on LocalOnly interface -// (.local manually generated via explicit callback) -// 2) for each search domain (from prefs pane), query for b._dns-sd._udp.. -// 3) for each result from (2), register LocalOnly PTR record b._dns-sd._udp.local. -> -// 4) result above should generate a callback from question in (1). result added to global list -// 5) global list delivered to client via GetSearchDomainList() -// 6) client calls to enumerate domains now go over LocalOnly interface -// (!!!KRS may add outgoing interface in addition) - -struct CompileTimeAssertionChecks_uDNS - { - // Check our structures are reasonable sizes. Including overly-large buffers, or embedding - // other overly-large structures instead of having a pointer to them, can inadvertently - // cause structure sizes (and therefore memory usage) to balloon unreasonably. - char sizecheck_tcpInfo_t [(sizeof(tcpInfo_t) <= 9056) ? 1 : -1]; - char sizecheck_SearchListElem[(sizeof(SearchListElem) <= 5000) ? 1 : -1]; - }; diff --git a/src/tools/mdnssd/uDNS.h b/src/tools/mdnssd/uDNS.h deleted file mode 100755 index 8e46ffa77d..0000000000 --- a/src/tools/mdnssd/uDNS.h +++ /dev/null @@ -1,136 +0,0 @@ -/* -*- Mode: C; tab-width: 4 -*- - * - * Copyright (c) 2002-2003 Apple Computer, Inc. All rights reserved. - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -#ifndef __UDNS_H_ -#define __UDNS_H_ - -#include "mDNSEmbeddedAPI.h" -#include "DNSCommon.h" - -#ifdef __cplusplus - extern "C" { -#endif - -#define RESTART_GOODBYE_DELAY (6 * mDNSPlatformOneSecond) // delay after restarting LLQ before nuking previous known answers (avoids flutter if we restart before we have networking up) -#define INIT_UCAST_POLL_INTERVAL (3 * mDNSPlatformOneSecond) // this interval is used after send failures on network transitions - // which typically heal quickly, so we start agressively and exponentially back off -#define MAX_UCAST_POLL_INTERVAL (60 * 60 * mDNSPlatformOneSecond) -//#define MAX_UCAST_POLL_INTERVAL (1 * 60 * mDNSPlatformOneSecond) -#define LLQ_POLL_INTERVAL (15 * 60 * mDNSPlatformOneSecond) // Polling interval for zones w/ an advertised LLQ port (ie not static zones) if LLQ fails due to NAT, etc. -#define RESPONSE_WINDOW (60 * mDNSPlatformOneSecond) // require server responses within one minute of request -#define MAX_UCAST_UNANSWERED_QUERIES 2 // the number of unanswered queries from any one uDNS server before trying another server -#define DNSSERVER_PENALTY_TIME (60 * mDNSPlatformOneSecond) // number of seconds for which new questions don't pick this server - -// On some interfaces, we want to delay the first retransmission to a minimum of 2 seconds -// rather than the default (1 second). -#define MIN_UCAST_RETRANS_TIMEOUT (2 * mDNSPlatformOneSecond) - -#define DEFAULT_UPDATE_LEASE 7200 - -#define QuestionIntervalStep 3 -#define QuestionIntervalStep2 (QuestionIntervalStep*QuestionIntervalStep) -#define QuestionIntervalStep3 (QuestionIntervalStep*QuestionIntervalStep*QuestionIntervalStep) -#define InitialQuestionInterval ((mDNSPlatformOneSecond + QuestionIntervalStep-1) / QuestionIntervalStep) - -// For Unicast record registrations, we initialize the interval to 1 second. When we send any query for -// the record registration e.g., GetZoneData, we always back off by QuestionIntervalStep -// so that the first retry does not happen until 3 seconds which should be enough for TCP/TLS to be done. -#define INIT_RECORD_REG_INTERVAL (1 * mDNSPlatformOneSecond) -#define MAX_RECORD_REG_INTERVAL (15 * 60 * mDNSPlatformOneSecond) -#define MERGE_DELAY_TIME (1 * mDNSPlatformOneSecond) - -// If we are refreshing, we do it at least 5 times with a min update frequency of -// 5 minutes -#define MAX_UPDATE_REFRESH_COUNT 5 -#define MIN_UPDATE_REFRESH_TIME (5 * 60 * mDNSPlatformOneSecond) - -// For questions that use kDNSServiceFlagsTimeout and we don't have a matching resolver e.g., no dns servers, -// then use the default value of 30 seconds -#define DEFAULT_UDNS_TIMEOUT 30 // in seconds - -// Entry points into unicast-specific routines - -extern void LLQGotZoneData(mDNS *const m, mStatus err, const ZoneData *zoneInfo); -extern void startLLQHandshake(mDNS *m, DNSQuestion *q); -extern void sendLLQRefresh(mDNS *m, DNSQuestion *q); - -extern void SleepRecordRegistrations(mDNS *m); - -// uDNS_UpdateRecord -// following fields must be set, and the update validated, upon entry. -// rr->NewRData -// rr->newrdlength -// rr->UpdateCallback - -extern mStatus uDNS_UpdateRecord(mDNS *m, AuthRecord *rr); - -extern void SetNextQueryTime(mDNS *const m, const DNSQuestion *const q); -extern CacheGroup *CacheGroupForName(const mDNS *const m, const mDNSu32 slot, const mDNSu32 namehash, const domainname *const name); -extern mStatus mDNS_Register_internal(mDNS *const m, AuthRecord *const rr); -extern mStatus mDNS_Deregister_internal(mDNS *const m, AuthRecord *const rr, mDNS_Dereg_type drt); -extern mStatus mDNS_StartQuery_internal(mDNS *const m, DNSQuestion *const question); -extern mStatus mDNS_StopQuery_internal(mDNS *const m, DNSQuestion *const question); -extern mStatus mDNS_StartNATOperation_internal(mDNS *const m, NATTraversalInfo *traversal); - -extern void RecordRegistrationGotZoneData(mDNS *const m, mStatus err, const ZoneData *zoneData); -extern mStatus uDNS_DeregisterRecord(mDNS *const m, AuthRecord *const rr); -extern const domainname *GetServiceTarget(mDNS *m, AuthRecord *const rr); -extern void uDNS_CheckCurrentQuestion(mDNS *const m); - -// integer fields of msg header must be in HOST byte order before calling this routine -extern void uDNS_ReceiveMsg(mDNS *const m, DNSMessage *const msg, const mDNSu8 *const end, - const mDNSAddr *const srcaddr, const mDNSIPPort srcport); - -extern void uDNS_Tasks(mDNS *const m); -extern void UpdateAllSRVRecords(mDNS *m); -extern void CheckNATMappings(mDNS *m); - -extern mStatus uDNS_SetupDNSConfig(mDNS *const m); - -// uDNS_SetupSearchDomains by default adds search domains. It also can be called with one or -// more values for "action" which does the following: -// -// -UDNS_START_WAB_QUERY - start Wide Area Bonjour (domain enumeration) queries - -#define UDNS_START_WAB_QUERY 0x00000001 - -extern mStatus uDNS_SetupSearchDomains(mDNS *const m, int action); -extern domainname *uDNS_GetNextSearchDomain(mDNS *const m, mDNSInterfaceID InterfaceID, mDNSs8 *searchIndex, mDNSBool ignoreDotLocal); - -typedef enum - { - uDNS_LLQ_Not = 0, // Normal uDNS answer: Flush any stale records from cache, and respect record TTL - uDNS_LLQ_Ignore, // LLQ initial challenge packet: ignore -- has no useful records for us - uDNS_LLQ_Entire, // LLQ initial set of answers: Flush any stale records from cache, but assume TTL is 2 x LLQ refresh interval - uDNS_LLQ_Events // LLQ event packet: don't flush cache; assume TTL is 2 x LLQ refresh interval - } uDNS_LLQType; - -extern uDNS_LLQType uDNS_recvLLQResponse(mDNS *const m, const DNSMessage *const msg, const mDNSu8 *const end, const mDNSAddr *const srcaddr, const mDNSIPPort srcport, DNSQuestion **matchQuestion); -extern DomainAuthInfo *GetAuthInfoForName_internal(mDNS *m, const domainname *const name); -extern DomainAuthInfo *GetAuthInfoForQuestion(mDNS *m, const DNSQuestion *const q); -extern void DisposeTCPConn(struct tcpInfo_t *tcp); - -// NAT traversal -extern void uDNS_ReceiveNATPMPPacket(mDNS *m, const mDNSInterfaceID InterfaceID, mDNSu8 *pkt, mDNSu16 len); // Called for each received NAT-PMP packet -extern void natTraversalHandleAddressReply(mDNS *const m, mDNSu16 err, mDNSv4Addr ExtAddr); -extern void natTraversalHandlePortMapReply(mDNS *const m, NATTraversalInfo *n, const mDNSInterfaceID InterfaceID, mDNSu16 err, mDNSIPPort extport, mDNSu32 lease); - -#ifdef __cplusplus - } -#endif - -#endif // __UDNS_H_ diff --git a/src/tools/mdnssd/uds_daemon.c b/src/tools/mdnssd/uds_daemon.c deleted file mode 100644 index c962173498..0000000000 --- a/src/tools/mdnssd/uds_daemon.c +++ /dev/null @@ -1,4716 +0,0 @@ -/* -*- Mode: C; tab-width: 4 -*- - * - * Copyright (c) 2003-2006 Apple Computer, Inc. All rights reserved. - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -#if defined(_WIN32) -#include -#define usleep(X) Sleep(((X)+999)/1000) -#else -#include -#include -#include -#include -#include -#include -#endif - -#include -#include - -#include "mDNSEmbeddedAPI.h" -#include "DNSCommon.h" -#include "uDNS.h" -#include "uds_daemon.h" - -// Normally we append search domains only for queries with a single label that are not -// fully qualified. This can be overridden to apply search domains for queries (that are -// not fully qualified) with any number of labels e.g., moon, moon.cs, moon.cs.be, etc. -mDNSBool AlwaysAppendSearchDomains = mDNSfalse; - -// Apple-specific functionality, not required for other platforms -#if APPLE_OSX_mDNSResponder -#include -#ifndef PID_FILE -#define PID_FILE "" -#endif -#endif - -#if APPLE_OSX_mDNSResponder -#include - -#if ! NO_WCF - -int WCFIsServerRunning(WCFConnection *conn) __attribute__((weak_import)); -int WCFNameResolvesToAddr(WCFConnection *conn, char* domainName, struct sockaddr* address, uid_t userid) __attribute__((weak_import)); -int WCFNameResolvesToName(WCFConnection *conn, char* fromName, char* toName, uid_t userid) __attribute__((weak_import)); - -// Do we really need to define a macro for "if"? -#define CHECK_WCF_FUNCTION(X) if (X) -#endif // ! NO_WCF - -#else -#define NO_WCF 1 -#endif // APPLE_OSX_mDNSResponder - -// User IDs 0-500 are system-wide processes, not actual users in the usual sense -// User IDs for real user accounts start at 501 and count up from there -#define SystemUID(X) ((X) <= 500) - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - Types and Data Structures -#endif - -typedef enum - { - t_uninitialized, - t_morecoming, - t_complete, - t_error, - t_terminated - } transfer_state; - -typedef struct request_state request_state; - -typedef void (*req_termination_fn)(request_state *request); - -typedef struct registered_record_entry - { - struct registered_record_entry *next; - mDNSu32 key; - client_context_t regrec_client_context; - request_state *request; - mDNSBool external_advertise; - mDNSInterfaceID origInterfaceID; - AuthRecord *rr; // Pointer to variable-sized AuthRecord (Why a pointer? Why not just embed it here?) - } registered_record_entry; - -// A single registered service: ServiceRecordSet + bookkeeping -// Note that we duplicate some fields from parent service_info object -// to facilitate cleanup, when instances and parent may be deallocated at different times. -typedef struct service_instance - { - struct service_instance *next; - request_state *request; - AuthRecord *subtypes; - mDNSBool renameonmemfree; // Set on config change when we deregister original name - mDNSBool clientnotified; // Has client been notified of successful registration yet? - mDNSBool default_local; // is this the "local." from an empty-string registration? - mDNSBool external_advertise; // is this is being advertised externally? - domainname domain; - ServiceRecordSet srs; // note -- variable-sized object -- must be last field in struct - } service_instance; - -// for multi-domain default browsing -typedef struct browser_t - { - struct browser_t *next; - domainname domain; - DNSQuestion q; - } browser_t; - -struct request_state - { - request_state *next; - request_state *primary; // If this operation is on a shared socket, pointer to primary - // request_state for the original DNSServiceCreateConnection() operation - dnssd_sock_t sd; - dnssd_sock_t errsd; - mDNSu32 uid; - void * platform_data; - - // Note: On a shared connection these fields in the primary structure, including hdr, are re-used - // for each new request. This is because, until we've read the ipc_msg_hdr to find out what the - // operation is, we don't know if we're going to need to allocate a new request_state or not. - transfer_state ts; - mDNSu32 hdr_bytes; // bytes of header already read - ipc_msg_hdr hdr; - mDNSu32 data_bytes; // bytes of message data already read - char *msgbuf; // pointer to data storage to pass to free() - const char *msgptr; // pointer to data to be read from (may be modified) - char *msgend; // pointer to byte after last byte of message - - // reply, termination, error, and client context info - int no_reply; // don't send asynchronous replies to client - mDNSs32 time_blocked; // record time of a blocked client - int unresponsiveness_reports; - struct reply_state *replies; // corresponding (active) reply list - req_termination_fn terminate; - DNSServiceFlags flags; - - union - { - registered_record_entry *reg_recs; // list of registrations for a connection-oriented request - struct - { - mDNSInterfaceID interface_id; - mDNSBool default_domain; - mDNSBool ForceMCast; - domainname regtype; - browser_t *browsers; - } browser; - struct - { - mDNSInterfaceID InterfaceID; - mDNSu16 txtlen; - void *txtdata; - mDNSIPPort port; - domainlabel name; - char type_as_string[MAX_ESCAPED_DOMAIN_NAME]; - domainname type; - mDNSBool default_domain; - domainname host; - mDNSBool autoname; // Set if this name is tied to the Computer Name - mDNSBool autorename; // Set if this client wants us to automatically rename on conflict - mDNSBool allowremotequery; // Respond to unicast queries from outside the local link? - int num_subtypes; - service_instance *instances; - } servicereg; - struct - { - mDNSInterfaceID interface_id; - mDNSu32 flags; - mDNSu32 protocol; - DNSQuestion q4; - DNSQuestion *q42; - DNSQuestion q6; - DNSQuestion *q62; - } addrinfo; - struct - { - mDNSIPPort ReqExt; // External port we originally requested, for logging purposes - NATTraversalInfo NATinfo; - } pm; - struct - { -#if 0 - DNSServiceFlags flags; -#endif - DNSQuestion q_all; - DNSQuestion q_default; - } enumeration; - struct - { - DNSQuestion q; - DNSQuestion *q2; - } queryrecord; - struct - { - DNSQuestion qtxt; - DNSQuestion qsrv; - const ResourceRecord *txt; - const ResourceRecord *srv; - mDNSs32 ReportTime; - mDNSBool external_advertise; - } resolve; - } u; - }; - -// struct physically sits between ipc message header and call-specific fields in the message buffer -typedef struct - { - DNSServiceFlags flags; // Note: This field is in NETWORK byte order - mDNSu32 ifi; // Note: This field is in NETWORK byte order - DNSServiceErrorType error; // Note: This field is in NETWORK byte order - } reply_hdr; - -typedef struct reply_state - { - struct reply_state *next; // If there are multiple unsent replies - mDNSu32 totallen; - mDNSu32 nwriten; - ipc_msg_hdr mhdr[1]; - reply_hdr rhdr[1]; - } reply_state; - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - Globals -#endif - -// globals -mDNSexport mDNS mDNSStorage; -mDNSexport const char ProgramName[] = "mDNSResponder"; - -static dnssd_sock_t listenfd = dnssd_InvalidSocket; -static request_state *all_requests = NULL; - -// Note asymmetry here between registration and browsing. -// For service registrations we only automatically register in domains that explicitly appear in local configuration data -// (so AutoRegistrationDomains could equally well be called SCPrefRegDomains) -// For service browsing we also learn automatic browsing domains from the network, so for that case we have: -// 1. SCPrefBrowseDomains (local configuration data) -// 2. LocalDomainEnumRecords (locally-generated local-only PTR records -- equivalent to slElem->AuthRecs in uDNS.c) -// 3. AutoBrowseDomains, which is populated by tracking add/rmv events in AutomaticBrowseDomainChange, the callback function for our mDNS_GetDomains call. -// By creating and removing our own LocalDomainEnumRecords, we trigger AutomaticBrowseDomainChange callbacks just like domains learned from the network would. - -mDNSexport DNameListElem *AutoRegistrationDomains; // Domains where we automatically register for empty-string registrations - -static DNameListElem *SCPrefBrowseDomains; // List of automatic browsing domains read from SCPreferences for "empty string" browsing -static ARListElem *LocalDomainEnumRecords; // List of locally-generated PTR records to augment those we learn from the network -mDNSexport DNameListElem *AutoBrowseDomains; // List created from those local-only PTR records plus records we get from the network - -#define MSG_PAD_BYTES 5 // pad message buffer (read from client) with n zero'd bytes to guarantee - // n get_string() calls w/o buffer overrun -// initialization, setup/teardown functions - -// If a platform specifies its own PID file name, we use that -#ifndef PID_FILE -#define PID_FILE "/var/run/mDNSResponder.pid" -#endif - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - General Utility Functions -#endif - -mDNSlocal void FatalError(char *errmsg) - { - LogMsg("%s: %s", errmsg, dnssd_strerror(dnssd_errno)); - *(long*)0 = 0; // On OS X abort() doesn't generate a crash log, but writing to zero does - abort(); // On platforms where writing to zero doesn't generate an exception, abort instead - } - -mDNSlocal mDNSu32 dnssd_htonl(mDNSu32 l) - { - mDNSu32 ret; - char *data = (char*) &ret; - put_uint32(l, &data); - return ret; - } - -// hack to search-replace perror's to LogMsg's -mDNSlocal void my_perror(char *errmsg) - { - LogMsg("%s: %d (%s)", errmsg, dnssd_errno, dnssd_strerror(dnssd_errno)); - } - -mDNSlocal void abort_request(request_state *req) - { - if (req->terminate == (req_termination_fn)~0) - { LogMsg("abort_request: ERROR: Attempt to abort operation %p with req->terminate %p", req, req->terminate); return; } - - // First stop whatever mDNSCore operation we were doing - // If this is actually a shared connection operation, then its req->terminate function will scan - // the all_requests list and terminate any subbordinate operations sharing this file descriptor - if (req->terminate) req->terminate(req); - - if (!dnssd_SocketValid(req->sd)) - { LogMsg("abort_request: ERROR: Attempt to abort operation %p with invalid fd %d", req, req->sd); return; } - - // Now, if this request_state is not subordinate to some other primary, close file descriptor and discard replies - if (!req->primary) - { - if (req->errsd != req->sd) LogOperation("%3d: Removing FD and closing errsd %d", req->sd, req->errsd); - else LogOperation("%3d: Removing FD", req->sd); - udsSupportRemoveFDFromEventLoop(req->sd, req->platform_data); // Note: This also closes file descriptor req->sd for us - if (req->errsd != req->sd) { dnssd_close(req->errsd); req->errsd = req->sd; } - - while (req->replies) // free pending replies - { - reply_state *ptr = req->replies; - req->replies = req->replies->next; - freeL("reply_state (abort)", ptr); - } - } - - // Set req->sd to something invalid, so that udsserver_idle knows to unlink and free this structure -#if APPLE_OSX_mDNSResponder && MACOSX_MDNS_MALLOC_DEBUGGING - // Don't use dnssd_InvalidSocket (-1) because that's the sentinel value MACOSX_MDNS_MALLOC_DEBUGGING uses - // for detecting when the memory for an object is inadvertently freed while the object is still on some list - req->sd = req->errsd = -2; -#else - req->sd = req->errsd = dnssd_InvalidSocket; -#endif - // We also set req->terminate to a bogus value so we know if abort_request() gets called again for this request - req->terminate = (req_termination_fn)~0; - } - -mDNSlocal void AbortUnlinkAndFree(request_state *req) - { - request_state **p = &all_requests; - abort_request(req); - while (*p && *p != req) p=&(*p)->next; - if (*p) { *p = req->next; freeL("request_state/AbortUnlinkAndFree", req); } - else LogMsg("AbortUnlinkAndFree: ERROR: Attempt to abort operation %p not in list", req); - } - -mDNSlocal reply_state *create_reply(const reply_op_t op, const size_t datalen, request_state *const request) - { - reply_state *reply; - - if ((unsigned)datalen < sizeof(reply_hdr)) - { - LogMsg("ERROR: create_reply - data length less than length of required fields"); - return NULL; - } - - reply = mallocL("reply_state", sizeof(reply_state) + datalen - sizeof(reply_hdr)); - if (!reply) FatalError("ERROR: malloc"); - - reply->next = mDNSNULL; - reply->totallen = (mDNSu32)datalen + sizeof(ipc_msg_hdr); - reply->nwriten = 0; - - reply->mhdr->version = VERSION; - reply->mhdr->datalen = (mDNSu32)datalen; - reply->mhdr->ipc_flags = 0; - reply->mhdr->op = op; - reply->mhdr->client_context = request->hdr.client_context; - reply->mhdr->reg_index = 0; - - return reply; - } - -// Append a reply to the list in a request object -// If our request is sharing a connection, then we append our reply_state onto the primary's list -mDNSlocal void append_reply(request_state *req, reply_state *rep) - { - request_state *r = req->primary ? req->primary : req; - reply_state **ptr = &r->replies; - while (*ptr) ptr = &(*ptr)->next; - *ptr = rep; - rep->next = NULL; - } - -// Generates a response message giving name, type, domain, plus interface index, -// suitable for a browse result or service registration result. -// On successful completion rep is set to point to a malloc'd reply_state struct -mDNSlocal mStatus GenerateNTDResponse(const domainname *const servicename, const mDNSInterfaceID id, - request_state *const request, reply_state **const rep, reply_op_t op, DNSServiceFlags flags, mStatus err) - { - domainlabel name; - domainname type, dom; - *rep = NULL; - if (!DeconstructServiceName(servicename, &name, &type, &dom)) - return kDNSServiceErr_Invalid; - else - { - char namestr[MAX_DOMAIN_LABEL+1]; - char typestr[MAX_ESCAPED_DOMAIN_NAME]; - char domstr [MAX_ESCAPED_DOMAIN_NAME]; - int len; - char *data; - - ConvertDomainLabelToCString_unescaped(&name, namestr); - ConvertDomainNameToCString(&type, typestr); - ConvertDomainNameToCString(&dom, domstr); - - // Calculate reply data length - len = sizeof(DNSServiceFlags); - len += sizeof(mDNSu32); // if index - len += sizeof(DNSServiceErrorType); - len += (int) (strlen(namestr) + 1); - len += (int) (strlen(typestr) + 1); - len += (int) (strlen(domstr) + 1); - - // Build reply header - *rep = create_reply(op, len, request); - (*rep)->rhdr->flags = dnssd_htonl(flags); - (*rep)->rhdr->ifi = dnssd_htonl(mDNSPlatformInterfaceIndexfromInterfaceID(&mDNSStorage, id, mDNSfalse)); - (*rep)->rhdr->error = dnssd_htonl(err); - - // Build reply body - data = (char *)&(*rep)->rhdr[1]; - put_string(namestr, &data); - put_string(typestr, &data); - put_string(domstr, &data); - - return mStatus_NoError; - } - } - -// Special support to enable the DNSServiceBrowse call made by Bonjour Browser -// Remove after Bonjour Browser is updated to use DNSServiceQueryRecord instead of DNSServiceBrowse -mDNSlocal void GenerateBonjourBrowserResponse(const domainname *const servicename, const mDNSInterfaceID id, - request_state *const request, reply_state **const rep, reply_op_t op, DNSServiceFlags flags, mStatus err) - { - char namestr[MAX_DOMAIN_LABEL+1]; - char typestr[MAX_ESCAPED_DOMAIN_NAME]; - static const char domstr[] = "."; - int len; - char *data; - - *rep = NULL; - - // 1. Put first label in namestr - ConvertDomainLabelToCString_unescaped((const domainlabel *)servicename, namestr); - - // 2. Put second label and "local" into typestr - mDNS_snprintf(typestr, sizeof(typestr), "%#s.local.", SecondLabel(servicename)); - - // Calculate reply data length - len = sizeof(DNSServiceFlags); - len += sizeof(mDNSu32); // if index - len += sizeof(DNSServiceErrorType); - len += (int) (strlen(namestr) + 1); - len += (int) (strlen(typestr) + 1); - len += (int) (strlen(domstr) + 1); - - // Build reply header - *rep = create_reply(op, len, request); - (*rep)->rhdr->flags = dnssd_htonl(flags); - (*rep)->rhdr->ifi = dnssd_htonl(mDNSPlatformInterfaceIndexfromInterfaceID(&mDNSStorage, id, mDNSfalse)); - (*rep)->rhdr->error = dnssd_htonl(err); - - // Build reply body - data = (char *)&(*rep)->rhdr[1]; - put_string(namestr, &data); - put_string(typestr, &data); - put_string(domstr, &data); - } - -// Returns a resource record (allocated w/ malloc) containing the data found in an IPC message -// Data must be in the following format: flags, interfaceIndex, name, rrtype, rrclass, rdlen, rdata, (optional) ttl -// (ttl only extracted/set if ttl argument is non-zero). Returns NULL for a bad-parameter error -mDNSlocal AuthRecord *read_rr_from_ipc_msg(request_state *request, int GetTTL, int validate_flags) - { - DNSServiceFlags flags = get_flags(&request->msgptr, request->msgend); - mDNSu32 interfaceIndex = get_uint32(&request->msgptr, request->msgend); - char name[256]; - int str_err = get_string(&request->msgptr, request->msgend, name, sizeof(name)); - mDNSu16 type = get_uint16(&request->msgptr, request->msgend); - mDNSu16 class = get_uint16(&request->msgptr, request->msgend); - mDNSu16 rdlen = get_uint16(&request->msgptr, request->msgend); - const char *rdata = get_rdata (&request->msgptr, request->msgend, rdlen); - mDNSu32 ttl = GetTTL ? get_uint32(&request->msgptr, request->msgend) : 0; - int storage_size = rdlen > sizeof(RDataBody) ? rdlen : sizeof(RDataBody); - AuthRecord *rr; - mDNSInterfaceID InterfaceID; - AuthRecType artype; - - request->flags = flags; - - if (str_err) { LogMsg("ERROR: read_rr_from_ipc_msg - get_string"); return NULL; } - - if (!request->msgptr) { LogMsg("Error reading Resource Record from client"); return NULL; } - - if (validate_flags && - !((flags & kDNSServiceFlagsShared) == kDNSServiceFlagsShared) && - !((flags & kDNSServiceFlagsUnique) == kDNSServiceFlagsUnique)) - { - LogMsg("ERROR: Bad resource record flags (must be kDNSServiceFlagsShared or kDNSServiceFlagsUnique)"); - return NULL; - } - - rr = mallocL("AuthRecord/read_rr_from_ipc_msg", sizeof(AuthRecord) - sizeof(RDataBody) + storage_size); - if (!rr) FatalError("ERROR: malloc"); - - InterfaceID = mDNSPlatformInterfaceIDfromInterfaceIndex(&mDNSStorage, interfaceIndex); - if (InterfaceID == mDNSInterface_LocalOnly) - artype = AuthRecordLocalOnly; - else if (InterfaceID == mDNSInterface_P2P) - artype = AuthRecordP2P; - else if ((InterfaceID == mDNSInterface_Any) && (flags & kDNSServiceFlagsIncludeP2P)) - artype = AuthRecordAnyIncludeP2P; - else - artype = AuthRecordAny; - - mDNS_SetupResourceRecord(rr, mDNSNULL, InterfaceID, type, 0, - (mDNSu8) ((flags & kDNSServiceFlagsShared) ? kDNSRecordTypeShared : kDNSRecordTypeUnique), artype, mDNSNULL, mDNSNULL); - - if (!MakeDomainNameFromDNSNameString(&rr->namestorage, name)) - { - LogMsg("ERROR: bad name: %s", name); - freeL("AuthRecord/read_rr_from_ipc_msg", rr); - return NULL; - } - - if (flags & kDNSServiceFlagsAllowRemoteQuery) rr->AllowRemoteQuery = mDNStrue; - rr->resrec.rrclass = class; - rr->resrec.rdlength = rdlen; - rr->resrec.rdata->MaxRDLength = rdlen; - mDNSPlatformMemCopy(rr->resrec.rdata->u.data, rdata, rdlen); - if (GetTTL) rr->resrec.rroriginalttl = ttl; - rr->resrec.namehash = DomainNameHashValue(rr->resrec.name); - SetNewRData(&rr->resrec, mDNSNULL, 0); // Sets rr->rdatahash for us - return rr; - } - -mDNSlocal int build_domainname_from_strings(domainname *srv, char *name, char *regtype, char *domain) - { - domainlabel n; - domainname d, t; - - if (!MakeDomainLabelFromLiteralString(&n, name)) return -1; - if (!MakeDomainNameFromDNSNameString(&t, regtype)) return -1; - if (!MakeDomainNameFromDNSNameString(&d, domain)) return -1; - if (!ConstructServiceName(srv, &n, &t, &d)) return -1; - return 0; - } - -mDNSlocal void send_all(dnssd_sock_t s, const char *ptr, int len) - { - int n = send(s, ptr, len, 0); - // On a freshly-created Unix Domain Socket, the kernel should *never* fail to buffer a small write for us - // (four bytes for a typical error code return, 12 bytes for DNSServiceGetProperty(DaemonVersion)). - // If it does fail, we don't attempt to handle this failure, but we do log it so we know something is wrong. - if (n < len) - LogMsg("ERROR: send_all(%d) wrote %d of %d errno %d (%s)", - s, n, len, dnssd_errno, dnssd_strerror(dnssd_errno)); - } - -#if 0 -mDNSlocal mDNSBool AuthorizedDomain(const request_state * const request, const domainname * const d, const DNameListElem * const doms) -{ - const DNameListElem *delem = mDNSNULL; - int bestDelta = -1; // the delta of the best match, lower is better - int dLabels = 0; - mDNSBool allow = mDNSfalse; - - if (SystemUID(request->uid)) return mDNStrue; - - dLabels = CountLabels(d); - for (delem = doms; delem; delem = delem->next) - { - if (delem->uid) - { - int delemLabels = CountLabels(&delem->name); - int delta = dLabels - delemLabels; - if ((bestDelta == -1 || delta <= bestDelta) && SameDomainName(&delem->name, SkipLeadingLabels(d, delta))) - { - bestDelta = delta; - allow = (allow || (delem->uid == request->uid)); - } - } - } - - return bestDelta == -1 ? mDNStrue : allow; -} -#endif - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - external helpers -#endif - -mDNSlocal void external_start_advertising_helper(service_instance *const instance) - { - AuthRecord *st = instance->subtypes; - ExtraResourceRecord *e; - int i; - - if (mDNSIPPortIsZero(instance->request->u.servicereg.port)) - { - LogInfo("external_start_advertising_helper: Not registering service with port number zero"); - return; - } - -#if APPLE_OSX_mDNSResponder - // Update packet filter if p2p interface already exists, otherwise, - // if will be updated when we get the KEV_DL_IF_ATTACHED event for - // the interface. Called here since we don't call external_start_advertising_service() - // with the SRV record when advertising a service. - mDNSInitPacketFilter(); -#endif // APPLE_OSX_mDNSResponder - - if (instance->external_advertise) LogMsg("external_start_advertising_helper: external_advertise already set!"); - - for ( i = 0; i < instance->request->u.servicereg.num_subtypes; i++) - external_start_advertising_service(&st[i].resrec); - - external_start_advertising_service(&instance->srs.RR_PTR.resrec); - external_start_advertising_service(&instance->srs.RR_TXT.resrec); - - for (e = instance->srs.Extras; e; e = e->next) - external_start_advertising_service(&e->r.resrec); - - instance->external_advertise = mDNStrue; - } - -mDNSlocal void external_stop_advertising_helper(service_instance *const instance) - { - AuthRecord *st = instance->subtypes; - ExtraResourceRecord *e; - int i; - - if (!instance->external_advertise) return; - - LogInfo("external_stop_advertising_helper: calling external_stop_advertising_service"); - - for ( i = 0; i < instance->request->u.servicereg.num_subtypes; i++) - external_stop_advertising_service(&st[i].resrec); - - external_stop_advertising_service(&instance->srs.RR_PTR.resrec); - external_stop_advertising_service(&instance->srs.RR_TXT.resrec); - - for (e = instance->srs.Extras; e; e = e->next) - external_stop_advertising_service(&e->r.resrec); - - instance->external_advertise = mDNSfalse; - } - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - DNSServiceRegister -#endif - -mDNSexport void FreeExtraRR(mDNS *const m, AuthRecord *const rr, mStatus result) - { - ExtraResourceRecord *extra = (ExtraResourceRecord *)rr->RecordContext; - (void)m; // Unused - - if (result != mStatus_MemFree) { LogMsg("Error: FreeExtraRR invoked with unexpected error %d", result); return; } - - LogInfo(" FreeExtraRR %s", RRDisplayString(m, &rr->resrec)); - - if (rr->resrec.rdata != &rr->rdatastorage) - freeL("Extra RData", rr->resrec.rdata); - freeL("ExtraResourceRecord/FreeExtraRR", extra); - } - -mDNSlocal void unlink_and_free_service_instance(service_instance *srv) - { - ExtraResourceRecord *e = srv->srs.Extras, *tmp; - - external_stop_advertising_helper(srv); - - // clear pointers from parent struct - if (srv->request) - { - service_instance **p = &srv->request->u.servicereg.instances; - while (*p) - { - if (*p == srv) { *p = (*p)->next; break; } - p = &(*p)->next; - } - } - - while (e) - { - e->r.RecordContext = e; - tmp = e; - e = e->next; - FreeExtraRR(&mDNSStorage, &tmp->r, mStatus_MemFree); - } - - if (srv->srs.RR_TXT.resrec.rdata != &srv->srs.RR_TXT.rdatastorage) - freeL("TXT RData", srv->srs.RR_TXT.resrec.rdata); - - if (srv->subtypes) { freeL("ServiceSubTypes", srv->subtypes); srv->subtypes = NULL; } - freeL("service_instance", srv); - } - -// Count how many other service records we have locally with the same name, but different rdata. -// For auto-named services, we can have at most one per machine -- if we allowed two auto-named services of -// the same type on the same machine, we'd get into an infinite autoimmune-response loop of continuous renaming. -mDNSexport int CountPeerRegistrations(mDNS *const m, ServiceRecordSet *const srs) - { - int count = 0; - ResourceRecord *r = &srs->RR_SRV.resrec; - AuthRecord *rr; - - for (rr = m->ResourceRecords; rr; rr=rr->next) - if (rr->resrec.rrtype == kDNSType_SRV && SameDomainName(rr->resrec.name, r->name) && !IdenticalSameNameRecord(&rr->resrec, r)) - count++; - - verbosedebugf("%d peer registrations for %##s", count, r->name->c); - return(count); - } - -mDNSexport int CountExistingRegistrations(domainname *srv, mDNSIPPort port) - { - int count = 0; - AuthRecord *rr; - for (rr = mDNSStorage.ResourceRecords; rr; rr=rr->next) - if (rr->resrec.rrtype == kDNSType_SRV && - mDNSSameIPPort(rr->resrec.rdata->u.srv.port, port) && - SameDomainName(rr->resrec.name, srv)) - count++; - return(count); - } - -mDNSlocal void SendServiceRemovalNotification(ServiceRecordSet *const srs) - { - reply_state *rep; - service_instance *instance = srs->ServiceContext; - if (GenerateNTDResponse(srs->RR_SRV.resrec.name, srs->RR_SRV.resrec.InterfaceID, instance->request, &rep, reg_service_reply_op, 0, mStatus_NoError) != mStatus_NoError) - LogMsg("%3d: SendServiceRemovalNotification: %##s is not valid DNS-SD SRV name", instance->request->sd, srs->RR_SRV.resrec.name->c); - else { append_reply(instance->request, rep); instance->clientnotified = mDNSfalse; } - } - -// service registration callback performs three duties - frees memory for deregistered services, -// handles name conflicts, and delivers completed registration information to the client -mDNSlocal void regservice_callback(mDNS *const m, ServiceRecordSet *const srs, mStatus result) - { - mStatus err; - mDNSBool SuppressError = mDNSfalse; - service_instance *instance; - reply_state *rep; - (void)m; // Unused - - if (!srs) { LogMsg("regservice_callback: srs is NULL %d", result); return; } - - instance = srs->ServiceContext; - if (!instance) { LogMsg("regservice_callback: srs->ServiceContext is NULL %d", result); return; } - - // don't send errors up to client for wide-area, empty-string registrations - if (instance->request && - instance->request->u.servicereg.default_domain && - !instance->default_local) - SuppressError = mDNStrue; - - if (mDNS_LoggingEnabled) - { - const char *const fmt = - (result == mStatus_NoError) ? "%s DNSServiceRegister(%##s, %u) REGISTERED" : - (result == mStatus_MemFree) ? "%s DNSServiceRegister(%##s, %u) DEREGISTERED" : - (result == mStatus_NameConflict) ? "%s DNSServiceRegister(%##s, %u) NAME CONFLICT" : - "%s DNSServiceRegister(%##s, %u) %s %d"; - char prefix[16] = "---:"; - if (instance->request) mDNS_snprintf(prefix, sizeof(prefix), "%3d:", instance->request->sd); - LogOperation(fmt, prefix, srs->RR_SRV.resrec.name->c, mDNSVal16(srs->RR_SRV.resrec.rdata->u.srv.port), - SuppressError ? "suppressed error" : "CALLBACK", result); - } - - if (!instance->request && result != mStatus_MemFree) { LogMsg("regservice_callback: instance->request is NULL %d", result); return; } - - if (result == mStatus_NoError) - { - if (instance->request->u.servicereg.allowremotequery) - { - ExtraResourceRecord *e; - srs->RR_ADV.AllowRemoteQuery = mDNStrue; - srs->RR_PTR.AllowRemoteQuery = mDNStrue; - srs->RR_SRV.AllowRemoteQuery = mDNStrue; - srs->RR_TXT.AllowRemoteQuery = mDNStrue; - for (e = instance->srs.Extras; e; e = e->next) e->r.AllowRemoteQuery = mDNStrue; - } - - if (GenerateNTDResponse(srs->RR_SRV.resrec.name, srs->RR_SRV.resrec.InterfaceID, instance->request, &rep, reg_service_reply_op, kDNSServiceFlagsAdd, result) != mStatus_NoError) - LogMsg("%3d: regservice_callback: %##s is not valid DNS-SD SRV name", instance->request->sd, srs->RR_SRV.resrec.name->c); - else { append_reply(instance->request, rep); instance->clientnotified = mDNStrue; } - - if (instance->request->u.servicereg.InterfaceID == mDNSInterface_P2P || (!instance->request->u.servicereg.InterfaceID && SameDomainName(&instance->domain, &localdomain) && (instance->request->flags & kDNSServiceFlagsIncludeP2P))) - { - LogInfo("regservice_callback: calling external_start_advertising_helper()"); - external_start_advertising_helper(instance); - } - if (instance->request->u.servicereg.autoname && CountPeerRegistrations(m, srs) == 0) - RecordUpdatedNiceLabel(m, 0); // Successfully got new name, tell user immediately - } - else if (result == mStatus_MemFree) - { - if (instance->request && instance->renameonmemfree) - { - external_stop_advertising_helper(instance); - instance->renameonmemfree = 0; - err = mDNS_RenameAndReregisterService(m, srs, &instance->request->u.servicereg.name); - if (err) LogMsg("ERROR: regservice_callback - RenameAndReregisterService returned %d", err); - // error should never happen - safest to log and continue - } - else - unlink_and_free_service_instance(instance); - } - else if (result == mStatus_NameConflict) - { - if (instance->request->u.servicereg.autorename) - { - external_stop_advertising_helper(instance); - if (instance->request->u.servicereg.autoname && CountPeerRegistrations(m, srs) == 0) - { - // On conflict for an autoname service, rename and reregister *all* autoname services - IncrementLabelSuffix(&m->nicelabel, mDNStrue); - mDNS_ConfigChanged(m); // Will call back into udsserver_handle_configchange() - } - else // On conflict for a non-autoname service, rename and reregister just that one service - { - if (instance->clientnotified) SendServiceRemovalNotification(srs); - mDNS_RenameAndReregisterService(m, srs, mDNSNULL); - } - } - else - { - if (!SuppressError) - { - if (GenerateNTDResponse(srs->RR_SRV.resrec.name, srs->RR_SRV.resrec.InterfaceID, instance->request, &rep, reg_service_reply_op, kDNSServiceFlagsAdd, result) != mStatus_NoError) - LogMsg("%3d: regservice_callback: %##s is not valid DNS-SD SRV name", instance->request->sd, srs->RR_SRV.resrec.name->c); - else { append_reply(instance->request, rep); instance->clientnotified = mDNStrue; } - } - unlink_and_free_service_instance(instance); - } - } - else // Not mStatus_NoError, mStatus_MemFree, or mStatus_NameConflict - { - if (!SuppressError) - { - if (GenerateNTDResponse(srs->RR_SRV.resrec.name, srs->RR_SRV.resrec.InterfaceID, instance->request, &rep, reg_service_reply_op, kDNSServiceFlagsAdd, result) != mStatus_NoError) - LogMsg("%3d: regservice_callback: %##s is not valid DNS-SD SRV name", instance->request->sd, srs->RR_SRV.resrec.name->c); - else { append_reply(instance->request, rep); instance->clientnotified = mDNStrue; } - } - } - } - -mDNSlocal void regrecord_callback(mDNS *const m, AuthRecord *rr, mStatus result) - { - (void)m; // Unused - if (!rr->RecordContext) // parent struct already freed by termination callback - { - if (result == mStatus_NoError) - LogMsg("Error: regrecord_callback: successful registration of orphaned record %s", ARDisplayString(m, rr)); - else - { - if (result != mStatus_MemFree) LogMsg("regrecord_callback: error %d received after parent termination", result); - - // We come here when the record is being deregistered either from DNSServiceRemoveRecord or connection_termination. - // If the record has been updated, we need to free the rdata. Everytime we call mDNS_Update, it calls update_callback - // with the old rdata (so that we can free it) and stores the new rdata in "rr->resrec.rdata". This means, we need - // to free the latest rdata for which the update_callback was never called with. - if (rr->resrec.rdata != &rr->rdatastorage) freeL("RData/regrecord_callback", rr->resrec.rdata); - freeL("AuthRecord/regrecord_callback", rr); - } - } - else - { - registered_record_entry *re = rr->RecordContext; - request_state *request = re->request; - - if (mDNS_LoggingEnabled) - { - char *fmt = (result == mStatus_NoError) ? "%3d: DNSServiceRegisterRecord(%u %s) REGISTERED" : - (result == mStatus_MemFree) ? "%3d: DNSServiceRegisterRecord(%u %s) DEREGISTERED" : - (result == mStatus_NameConflict) ? "%3d: DNSServiceRegisterRecord(%u %s) NAME CONFLICT" : - "%3d: DNSServiceRegisterRecord(%u %s) %d"; - LogOperation(fmt, request->sd, re->key, RRDisplayString(m, &rr->resrec), result); - } - - if (result != mStatus_MemFree) - { - int len = sizeof(DNSServiceFlags) + sizeof(mDNSu32) + sizeof(DNSServiceErrorType); - reply_state *reply = create_reply(reg_record_reply_op, len, request); - reply->mhdr->client_context = re->regrec_client_context; - reply->rhdr->flags = dnssd_htonl(0); - reply->rhdr->ifi = dnssd_htonl(mDNSPlatformInterfaceIndexfromInterfaceID(m, rr->resrec.InterfaceID, mDNSfalse)); - reply->rhdr->error = dnssd_htonl(result); - append_reply(request, reply); - } - - if (result) - { - // unlink from list, free memory - registered_record_entry **ptr = &request->u.reg_recs; - while (*ptr && (*ptr) != re) ptr = &(*ptr)->next; - if (!*ptr) { LogMsg("regrecord_callback - record not in list!"); return; } - *ptr = (*ptr)->next; - freeL("registered_record_entry AuthRecord regrecord_callback", re->rr); - freeL("registered_record_entry regrecord_callback", re); - } - else - { - if (re->external_advertise) LogMsg("regrecord_callback: external_advertise already set!"); - - if (re->origInterfaceID == mDNSInterface_P2P || (!re->origInterfaceID && IsLocalDomain(&rr->namestorage) && (request->flags & kDNSServiceFlagsIncludeP2P))) - { - LogInfo("regrecord_callback: calling external_start_advertising_service"); - external_start_advertising_service(&rr->resrec); - re->external_advertise = mDNStrue; - } - } - } - } - -mDNSlocal void connection_termination(request_state *request) - { - // When terminating a shared connection, we need to scan the all_requests list - // and terminate any subbordinate operations sharing this file descriptor - request_state **req = &all_requests; - - LogOperation("%3d: DNSServiceCreateConnection STOP", request->sd); - - while (*req) - { - if ((*req)->primary == request) - { - // Since we're already doing a list traversal, we unlink the request directly instead of using AbortUnlinkAndFree() - request_state *tmp = *req; - if (tmp->primary == tmp) LogMsg("connection_termination ERROR (*req)->primary == *req for %p %d", tmp, tmp->sd); - if (tmp->replies) LogMsg("connection_termination ERROR How can subordinate req %p %d have replies queued?", tmp, tmp->sd); - abort_request(tmp); - *req = tmp->next; - freeL("request_state/connection_termination", tmp); - } - else - req = &(*req)->next; - } - - while (request->u.reg_recs) - { - registered_record_entry *ptr = request->u.reg_recs; - LogOperation("%3d: DNSServiceRegisterRecord(%u %s) STOP", request->sd, ptr->key, RRDisplayString(&mDNSStorage, &ptr->rr->resrec)); - request->u.reg_recs = request->u.reg_recs->next; - ptr->rr->RecordContext = NULL; - if (ptr->external_advertise) - { - ptr->external_advertise = mDNSfalse; - external_stop_advertising_service(&ptr->rr->resrec); - } - mDNS_Deregister(&mDNSStorage, ptr->rr); // Will free ptr->rr for us - freeL("registered_record_entry/connection_termination", ptr); - } - } - -mDNSlocal void handle_cancel_request(request_state *request) - { - request_state **req = &all_requests; - LogOperation("%3d: Cancel %08X %08X", request->sd, request->hdr.client_context.u32[1], request->hdr.client_context.u32[0]); - while (*req) - { - if ((*req)->primary == request && - (*req)->hdr.client_context.u32[0] == request->hdr.client_context.u32[0] && - (*req)->hdr.client_context.u32[1] == request->hdr.client_context.u32[1]) - { - // Since we're already doing a list traversal, we unlink the request directly instead of using AbortUnlinkAndFree() - request_state *tmp = *req; - abort_request(tmp); - *req = tmp->next; - freeL("request_state/handle_cancel_request", tmp); - } - else - req = &(*req)->next; - } - } - -mDNSlocal mStatus handle_regrecord_request(request_state *request) - { - mStatus err = mStatus_BadParamErr; - AuthRecord *rr = read_rr_from_ipc_msg(request, 1, 1); - if (rr) - { - registered_record_entry *re; - // Don't allow non-local domains to be regsitered as LocalOnly. Allowing this would permit - // clients to register records such as www.bigbank.com A w.x.y.z to redirect Safari. - if (rr->resrec.InterfaceID == mDNSInterface_LocalOnly && !IsLocalDomain(rr->resrec.name) && - rr->resrec.rrclass == kDNSClass_IN && (rr->resrec.rrtype == kDNSType_A || rr->resrec.rrtype == kDNSType_AAAA || - rr->resrec.rrtype == kDNSType_CNAME)) - { - freeL("AuthRecord/handle_regrecord_request", rr); - return (mStatus_BadParamErr); - } - // allocate registration entry, link into list - re = mallocL("registered_record_entry", sizeof(registered_record_entry)); - if (!re) FatalError("ERROR: malloc"); - re->key = request->hdr.reg_index; - re->rr = rr; - re->regrec_client_context = request->hdr.client_context; - re->request = request; - re->external_advertise = mDNSfalse; - rr->RecordContext = re; - rr->RecordCallback = regrecord_callback; - - re->origInterfaceID = rr->resrec.InterfaceID; - if (rr->resrec.InterfaceID == mDNSInterface_P2P) rr->resrec.InterfaceID = mDNSInterface_Any; -#if 0 - if (!AuthorizedDomain(request, rr->resrec.name, AutoRegistrationDomains)) return (mStatus_NoError); -#endif - if (rr->resrec.rroriginalttl == 0) - rr->resrec.rroriginalttl = DefaultTTLforRRType(rr->resrec.rrtype); - - LogOperation("%3d: DNSServiceRegisterRecord(%u %s) START", request->sd, re->key, RRDisplayString(&mDNSStorage, &rr->resrec)); - err = mDNS_Register(&mDNSStorage, rr); - if (err) - { - LogOperation("%3d: DNSServiceRegisterRecord(%u %s) ERROR (%d)", request->sd, re->key, RRDisplayString(&mDNSStorage, &rr->resrec), err); - freeL("registered_record_entry", re); - freeL("registered_record_entry/AuthRecord", rr); - } - else - { - re->next = request->u.reg_recs; - request->u.reg_recs = re; - } - } - return(err); - } - -mDNSlocal void UpdateDeviceInfoRecord(mDNS *const m); - -mDNSlocal void regservice_termination_callback(request_state *request) - { - if (!request) { LogMsg("regservice_termination_callback context is NULL"); return; } - while (request->u.servicereg.instances) - { - service_instance *p = request->u.servicereg.instances; - request->u.servicereg.instances = request->u.servicereg.instances->next; - // only safe to free memory if registration is not valid, i.e. deregister fails (which invalidates p) - LogOperation("%3d: DNSServiceRegister(%##s, %u) STOP", - request->sd, p->srs.RR_SRV.resrec.name->c, mDNSVal16(p->srs.RR_SRV.resrec.rdata->u.srv.port)); - - external_stop_advertising_helper(p); - - // Clear backpointer *before* calling mDNS_DeregisterService/unlink_and_free_service_instance - // We don't need unlink_and_free_service_instance to cut its element from the list, because we're already advancing - // request->u.servicereg.instances as we work our way through the list, implicitly cutting one element at a time - // We can't clear p->request *after* the calling mDNS_DeregisterService/unlink_and_free_service_instance - // because by then we might have already freed p - p->request = NULL; - if (mDNS_DeregisterService(&mDNSStorage, &p->srs)) unlink_and_free_service_instance(p); - // Don't touch service_instance *p after this -- it's likely to have been freed already - } - if (request->u.servicereg.txtdata) - { freeL("service_info txtdata", request->u.servicereg.txtdata); request->u.servicereg.txtdata = NULL; } - if (request->u.servicereg.autoname) - { - // Clear autoname before calling UpdateDeviceInfoRecord() so it doesn't mistakenly include this in its count of active autoname registrations - request->u.servicereg.autoname = mDNSfalse; - UpdateDeviceInfoRecord(&mDNSStorage); - } - } - -mDNSlocal request_state *LocateSubordinateRequest(request_state *request) - { - request_state *req; - for (req = all_requests; req; req = req->next) - if (req->primary == request && - req->hdr.client_context.u32[0] == request->hdr.client_context.u32[0] && - req->hdr.client_context.u32[1] == request->hdr.client_context.u32[1]) return(req); - return(request); - } - -mDNSlocal mStatus add_record_to_service(request_state *request, service_instance *instance, mDNSu16 rrtype, mDNSu16 rdlen, const char *rdata, mDNSu32 ttl) - { - ServiceRecordSet *srs = &instance->srs; - mStatus result; - int size = rdlen > sizeof(RDataBody) ? rdlen : sizeof(RDataBody); - ExtraResourceRecord *extra = mallocL("ExtraResourceRecord", sizeof(*extra) - sizeof(RDataBody) + size); - if (!extra) { my_perror("ERROR: malloc"); return mStatus_NoMemoryErr; } - - mDNSPlatformMemZero(extra, sizeof(ExtraResourceRecord)); // OK if oversized rdata not zero'd - extra->r.resrec.rrtype = rrtype; - extra->r.rdatastorage.MaxRDLength = (mDNSu16) size; - extra->r.resrec.rdlength = rdlen; - mDNSPlatformMemCopy(&extra->r.rdatastorage.u.data, rdata, rdlen); - - result = mDNS_AddRecordToService(&mDNSStorage, srs, extra, &extra->r.rdatastorage, ttl, - (request->flags & kDNSServiceFlagsIncludeP2P) ? 1: 0); - if (result) { freeL("ExtraResourceRecord/add_record_to_service", extra); return result; } - - extra->ClientID = request->hdr.reg_index; - if (instance->external_advertise && (instance->request->u.servicereg.InterfaceID == mDNSInterface_P2P || (!instance->request->u.servicereg.InterfaceID && SameDomainName(&instance->domain, &localdomain) && (instance->request->flags & kDNSServiceFlagsIncludeP2P)))) - { - LogInfo("add_record_to_service: calling external_start_advertising_service"); - external_start_advertising_service(&extra->r.resrec); - } - return result; - } - -mDNSlocal mStatus handle_add_request(request_state *request) - { - service_instance *i; - mStatus result = mStatus_UnknownErr; - DNSServiceFlags flags = get_flags (&request->msgptr, request->msgend); - mDNSu16 rrtype = get_uint16(&request->msgptr, request->msgend); - mDNSu16 rdlen = get_uint16(&request->msgptr, request->msgend); - const char *rdata = get_rdata (&request->msgptr, request->msgend, rdlen); - mDNSu32 ttl = get_uint32(&request->msgptr, request->msgend); - if (!ttl) ttl = DefaultTTLforRRType(rrtype); - (void)flags; // Unused - - if (!request->msgptr) { LogMsg("%3d: DNSServiceAddRecord(unreadable parameters)", request->sd); return(mStatus_BadParamErr); } - - // If this is a shared connection, check if the operation actually applies to a subordinate request_state object - if (request->terminate == connection_termination) request = LocateSubordinateRequest(request); - - if (request->terminate != regservice_termination_callback) - { LogMsg("%3d: DNSServiceAddRecord(not a registered service ref)", request->sd); return(mStatus_BadParamErr); } - - // For a service registered with zero port, don't allow adding records. This mostly happens due to a bug - // in the application. See radar://9165807. - if (mDNSIPPortIsZero(request->u.servicereg.port)) - { LogMsg("%3d: DNSServiceAddRecord: adding record to a service registered with zero port", request->sd); return(mStatus_BadParamErr); } - - LogOperation("%3d: DNSServiceAddRecord(%X, %##s, %s, %d)", request->sd, flags, - (request->u.servicereg.instances) ? request->u.servicereg.instances->srs.RR_SRV.resrec.name->c : NULL, DNSTypeName(rrtype), rdlen); - - for (i = request->u.servicereg.instances; i; i = i->next) - { - result = add_record_to_service(request, i, rrtype, rdlen, rdata, ttl); - if (result && i->default_local) break; - else result = mStatus_NoError; // suppress non-local default errors - } - - return(result); - } - -mDNSlocal void update_callback(mDNS *const m, AuthRecord *const rr, RData *oldrd, mDNSu16 oldrdlen) - { - mDNSBool external_advertise = (rr->UpdateContext) ? *((mDNSBool *)rr->UpdateContext) : mDNSfalse; - (void)m; // Unused - - // There are three cases. - // - // 1. We have updated the primary TXT record of the service - // 2. We have updated the TXT record that was added to the service using DNSServiceAddRecord - // 3. We have updated the TXT record that was registered using DNSServiceRegisterRecord - // - // external_advertise is set if we have advertised at least once during the initial addition - // of the record in all of the three cases above. We should have checked for InterfaceID/LocalDomain - // checks during the first time and hence we don't do any checks here - if (external_advertise) - { - ResourceRecord ext = rr->resrec; - if (ext.rdlength == oldrdlen && mDNSPlatformMemSame(&ext.rdata->u, &oldrd->u, oldrdlen)) goto exit; - SetNewRData(&ext, oldrd, oldrdlen); - external_stop_advertising_service(&ext); - LogInfo("update_callback: calling external_start_advertising_service"); - external_start_advertising_service(&rr->resrec); - } -exit: - if (oldrd != &rr->rdatastorage) freeL("RData/update_callback", oldrd); - } - -mDNSlocal mStatus update_record(AuthRecord *rr, mDNSu16 rdlen, const char *rdata, mDNSu32 ttl, const mDNSBool *const external_advertise) - { - mStatus result; - const int rdsize = rdlen > sizeof(RDataBody) ? rdlen : sizeof(RDataBody); - RData *newrd = mallocL("RData/update_record", sizeof(RData) - sizeof(RDataBody) + rdsize); - if (!newrd) FatalError("ERROR: malloc"); - newrd->MaxRDLength = (mDNSu16) rdsize; - mDNSPlatformMemCopy(&newrd->u, rdata, rdlen); - - // BIND named (name daemon) doesn't allow TXT records with zero-length rdata. This is strictly speaking correct, - // since RFC 1035 specifies a TXT record as "One or more s", not "Zero or more s". - // Since some legacy apps try to create zero-length TXT records, we'll silently correct it here. - if (rr->resrec.rrtype == kDNSType_TXT && rdlen == 0) { rdlen = 1; newrd->u.txt.c[0] = 0; } - - if (external_advertise) rr->UpdateContext = (void *)external_advertise; - - result = mDNS_Update(&mDNSStorage, rr, ttl, rdlen, newrd, update_callback); - if (result) { LogMsg("update_record: Error %d for %s", (int)result, ARDisplayString(&mDNSStorage, rr)); freeL("RData/update_record", newrd); } - return result; - } - -mDNSlocal mStatus handle_update_request(request_state *request) - { - const ipc_msg_hdr *const hdr = &request->hdr; - mStatus result = mStatus_BadReferenceErr; - service_instance *i; - AuthRecord *rr = NULL; - - // get the message data - DNSServiceFlags flags = get_flags (&request->msgptr, request->msgend); // flags unused - mDNSu16 rdlen = get_uint16(&request->msgptr, request->msgend); - const char *rdata = get_rdata (&request->msgptr, request->msgend, rdlen); - mDNSu32 ttl = get_uint32(&request->msgptr, request->msgend); - (void)flags; // Unused - - if (!request->msgptr) { LogMsg("%3d: DNSServiceUpdateRecord(unreadable parameters)", request->sd); return(mStatus_BadParamErr); } - - // If this is a shared connection, check if the operation actually applies to a subordinate request_state object - if (request->terminate == connection_termination) request = LocateSubordinateRequest(request); - - if (request->terminate == connection_termination) - { - // update an individually registered record - registered_record_entry *reptr; - for (reptr = request->u.reg_recs; reptr; reptr = reptr->next) - { - if (reptr->key == hdr->reg_index) - { - result = update_record(reptr->rr, rdlen, rdata, ttl, &reptr->external_advertise); - LogOperation("%3d: DNSServiceUpdateRecord(%##s, %s)", - request->sd, reptr->rr->resrec.name->c, reptr->rr ? DNSTypeName(reptr->rr->resrec.rrtype) : ""); - goto end; - } - } - result = mStatus_BadReferenceErr; - goto end; - } - - if (request->terminate != regservice_termination_callback) - { LogMsg("%3d: DNSServiceUpdateRecord(not a registered service ref)", request->sd); return(mStatus_BadParamErr); } - - // For a service registered with zero port, only SRV record is initialized. Don't allow any updates. - if (mDNSIPPortIsZero(request->u.servicereg.port)) - { LogMsg("%3d: DNSServiceUpdateRecord: updating the record of a service registered with zero port", request->sd); return(mStatus_BadParamErr); } - - // update the saved off TXT data for the service - if (hdr->reg_index == TXT_RECORD_INDEX) - { - if (request->u.servicereg.txtdata) - { freeL("service_info txtdata", request->u.servicereg.txtdata); request->u.servicereg.txtdata = NULL; } - if (rdlen > 0) - { - request->u.servicereg.txtdata = mallocL("service_info txtdata", rdlen); - if (!request->u.servicereg.txtdata) FatalError("ERROR: handle_update_request - malloc"); - mDNSPlatformMemCopy(request->u.servicereg.txtdata, rdata, rdlen); - } - request->u.servicereg.txtlen = rdlen; - } - - // update a record from a service record set - for (i = request->u.servicereg.instances; i; i = i->next) - { - if (hdr->reg_index == TXT_RECORD_INDEX) rr = &i->srs.RR_TXT; - else - { - ExtraResourceRecord *e; - for (e = i->srs.Extras; e; e = e->next) - if (e->ClientID == hdr->reg_index) { rr = &e->r; break; } - } - - if (!rr) { result = mStatus_BadReferenceErr; goto end; } - result = update_record(rr, rdlen, rdata, ttl, &i->external_advertise); - if (result && i->default_local) goto end; - else result = mStatus_NoError; // suppress non-local default errors - } - -end: - if (request->terminate == regservice_termination_callback) - LogOperation("%3d: DNSServiceUpdateRecord(%##s, %s)", request->sd, - (request->u.servicereg.instances) ? request->u.servicereg.instances->srs.RR_SRV.resrec.name->c : NULL, - rr ? DNSTypeName(rr->resrec.rrtype) : ""); - - return(result); - } - -// remove a resource record registered via DNSServiceRegisterRecord() -mDNSlocal mStatus remove_record(request_state *request) - { - mStatus err = mStatus_UnknownErr; - registered_record_entry *e, **ptr = &request->u.reg_recs; - - while (*ptr && (*ptr)->key != request->hdr.reg_index) ptr = &(*ptr)->next; - if (!*ptr) { LogMsg("%3d: DNSServiceRemoveRecord(%u) not found", request->sd, request->hdr.reg_index); return mStatus_BadReferenceErr; } - e = *ptr; - *ptr = e->next; // unlink - - LogOperation("%3d: DNSServiceRemoveRecord(%u %s)", request->sd, e->key, RRDisplayString(&mDNSStorage, &e->rr->resrec)); - e->rr->RecordContext = NULL; - if (e->external_advertise) - { - external_stop_advertising_service(&e->rr->resrec); - e->external_advertise = mDNSfalse; - } - err = mDNS_Deregister(&mDNSStorage, e->rr); // Will free e->rr for us; we're responsible for freeing e - if (err) - { - LogMsg("ERROR: remove_record, mDNS_Deregister: %d", err); - freeL("registered_record_entry AuthRecord remove_record", e->rr); - } - - freeL("registered_record_entry remove_record", e); - return err; - } - -mDNSlocal mStatus remove_extra(const request_state *const request, service_instance *const serv, mDNSu16 *const rrtype) - { - mStatus err = mStatus_BadReferenceErr; - ExtraResourceRecord *ptr; - - for (ptr = serv->srs.Extras; ptr; ptr = ptr->next) - { - if (ptr->ClientID == request->hdr.reg_index) // found match - { - *rrtype = ptr->r.resrec.rrtype; - if (serv->external_advertise) external_stop_advertising_service(&ptr->r.resrec); - err = mDNS_RemoveRecordFromService(&mDNSStorage, &serv->srs, ptr, FreeExtraRR, ptr); - break; - } - } - return err; - } - -mDNSlocal mStatus handle_removerecord_request(request_state *request) - { - mStatus err = mStatus_BadReferenceErr; - get_flags(&request->msgptr, request->msgend); // flags unused - - if (!request->msgptr) { LogMsg("%3d: DNSServiceRemoveRecord(unreadable parameters)", request->sd); return(mStatus_BadParamErr); } - - // If this is a shared connection, check if the operation actually applies to a subordinate request_state object - if (request->terminate == connection_termination) request = LocateSubordinateRequest(request); - - if (request->terminate == connection_termination) - err = remove_record(request); // remove individually registered record - else if (request->terminate != regservice_termination_callback) - { LogMsg("%3d: DNSServiceRemoveRecord(not a registered service ref)", request->sd); return(mStatus_BadParamErr); } - else - { - service_instance *i; - mDNSu16 rrtype = 0; - LogOperation("%3d: DNSServiceRemoveRecord(%##s, %s)", request->sd, - (request->u.servicereg.instances) ? request->u.servicereg.instances->srs.RR_SRV.resrec.name->c : NULL, - rrtype ? DNSTypeName(rrtype) : ""); - for (i = request->u.servicereg.instances; i; i = i->next) - { - err = remove_extra(request, i, &rrtype); - if (err && i->default_local) break; - else err = mStatus_NoError; // suppress non-local default errors - } - } - - return(err); - } - -// If there's a comma followed by another character, -// FindFirstSubType overwrites the comma with a nul and returns the pointer to the next character. -// Otherwise, it returns a pointer to the final nul at the end of the string -mDNSlocal char *FindFirstSubType(char *p) - { - while (*p) - { - if (p[0] == '\\' && p[1]) p += 2; - else if (p[0] == ',' && p[1]) { *p++ = 0; return(p); } - else p++; - } - return(p); - } - -// If there's a comma followed by another character, -// FindNextSubType overwrites the comma with a nul and returns the pointer to the next character. -// If it finds an illegal unescaped dot in the subtype name, it returns mDNSNULL -// Otherwise, it returns a pointer to the final nul at the end of the string -mDNSlocal char *FindNextSubType(char *p) - { - while (*p) - { - if (p[0] == '\\' && p[1]) // If escape character - p += 2; // ignore following character - else if (p[0] == ',') // If we found a comma - { - if (p[1]) *p++ = 0; - return(p); - } - else if (p[0] == '.') - return(mDNSNULL); - else p++; - } - return(p); - } - -// Returns -1 if illegal subtype found -mDNSexport mDNSs32 ChopSubTypes(char *regtype) - { - mDNSs32 NumSubTypes = 0; - char *stp = FindFirstSubType(regtype); - while (stp && *stp) // If we found a comma... - { - if (*stp == ',') return(-1); - NumSubTypes++; - stp = FindNextSubType(stp); - } - if (!stp) return(-1); - return(NumSubTypes); - } - -mDNSexport AuthRecord *AllocateSubTypes(mDNSs32 NumSubTypes, char *p) - { - AuthRecord *st = mDNSNULL; - if (NumSubTypes) - { - mDNSs32 i; - st = mallocL("ServiceSubTypes", NumSubTypes * sizeof(AuthRecord)); - if (!st) return(mDNSNULL); - for (i = 0; i < NumSubTypes; i++) - { - mDNS_SetupResourceRecord(&st[i], mDNSNULL, mDNSInterface_Any, kDNSQType_ANY, kStandardTTL, 0, AuthRecordAny, mDNSNULL, mDNSNULL); - while (*p) p++; - p++; - if (!MakeDomainNameFromDNSNameString(&st[i].namestorage, p)) - { freeL("ServiceSubTypes", st); return(mDNSNULL); } - } - } - return(st); - } - -mDNSlocal mStatus register_service_instance(request_state *request, const domainname *domain) - { - service_instance **ptr, *instance; - const int extra_size = (request->u.servicereg.txtlen > sizeof(RDataBody)) ? (request->u.servicereg.txtlen - sizeof(RDataBody)) : 0; - const mDNSBool DomainIsLocal = SameDomainName(domain, &localdomain); - mStatus result; - mDNSInterfaceID interfaceID = request->u.servicereg.InterfaceID; - mDNSu32 regFlags = 0; - - if (interfaceID == mDNSInterface_P2P) - { - interfaceID = mDNSInterface_Any; - regFlags |= regFlagIncludeP2P; - } - else if (request->flags & kDNSServiceFlagsIncludeP2P) - regFlags |= regFlagIncludeP2P; - - // client guarantees that record names are unique - if (request->flags & kDNSServiceFlagsForce) - regFlags |= regFlagKnownUnique; - - // If the client specified an interface, but no domain, then we honor the specified interface for the "local" (mDNS) - // registration but for the wide-area registrations we don't (currently) have any concept of a wide-area unicast - // registrations scoped to a specific interface, so for the automatic domains we add we must *not* specify an interface. - // (Specifying an interface with an apparently wide-area domain (i.e. something other than "local") - // currently forces the registration to use mDNS multicast despite the apparently wide-area domain.) - if (request->u.servicereg.default_domain && !DomainIsLocal) interfaceID = mDNSInterface_Any; - - for (ptr = &request->u.servicereg.instances; *ptr; ptr = &(*ptr)->next) - { - if (SameDomainName(&(*ptr)->domain, domain)) - { - LogMsg("register_service_instance: domain %##s already registered for %#s.%##s", - domain->c, &request->u.servicereg.name, &request->u.servicereg.type); - return mStatus_AlreadyRegistered; - } - } - - if (mDNSStorage.KnownBugs & mDNS_KnownBug_LimitedIPv6) - { - // Special-case hack: On Mac OS X 10.6.x and earlier we don't advertise SMB service in AutoTunnel domains, - // because AutoTunnel services have to support IPv6, and in Mac OS X 10.6.x the SMB server does not. - // BTMM: Don't advertise SMB with BTMM because it doesn't support IPv6 - if (SameDomainName(&request->u.servicereg.type, (const domainname *) "\x4" "_smb" "\x4" "_tcp")) - { - DomainAuthInfo *AuthInfo = GetAuthInfoForName(&mDNSStorage, domain); - if (AuthInfo && AuthInfo->AutoTunnel) return(kDNSServiceErr_Unsupported); - } - } - - instance = mallocL("service_instance", sizeof(*instance) + extra_size); - if (!instance) { my_perror("ERROR: malloc"); return mStatus_NoMemoryErr; } - - instance->next = mDNSNULL; - instance->request = request; - instance->subtypes = AllocateSubTypes(request->u.servicereg.num_subtypes, request->u.servicereg.type_as_string); - instance->renameonmemfree = 0; - instance->clientnotified = mDNSfalse; - instance->default_local = (request->u.servicereg.default_domain && DomainIsLocal); - instance->external_advertise = mDNSfalse; - AssignDomainName(&instance->domain, domain); - - if (request->u.servicereg.num_subtypes && !instance->subtypes) - { unlink_and_free_service_instance(instance); instance = NULL; FatalError("ERROR: malloc"); } - - result = mDNS_RegisterService(&mDNSStorage, &instance->srs, - &request->u.servicereg.name, &request->u.servicereg.type, domain, - request->u.servicereg.host.c[0] ? &request->u.servicereg.host : NULL, - request->u.servicereg.port, - request->u.servicereg.txtdata, request->u.servicereg.txtlen, - instance->subtypes, request->u.servicereg.num_subtypes, - interfaceID, regservice_callback, instance, regFlags); - - if (!result) - { - *ptr = instance; // Append this to the end of our request->u.servicereg.instances list - LogOperation("%3d: DNSServiceRegister(%##s, %u) ADDED", - instance->request->sd, instance->srs.RR_SRV.resrec.name->c, mDNSVal16(request->u.servicereg.port)); - } - else - { - LogMsg("register_service_instance %#s.%##s%##s error %d", - &request->u.servicereg.name, &request->u.servicereg.type, domain->c, result); - unlink_and_free_service_instance(instance); - } - - return result; - } - -mDNSlocal void udsserver_default_reg_domain_changed(const DNameListElem *const d, const mDNSBool add) - { - request_state *request; - -#if APPLE_OSX_mDNSResponder - machserver_automatic_registration_domain_changed(&d->name, add); -#endif // APPLE_OSX_mDNSResponder - - LogMsg("%s registration domain %##s", add ? "Adding" : "Removing", d->name.c); - for (request = all_requests; request; request = request->next) - { - if (request->terminate != regservice_termination_callback) continue; - if (!request->u.servicereg.default_domain) continue; - if (!d->uid || SystemUID(request->uid) || request->uid == d->uid) - { - service_instance **ptr = &request->u.servicereg.instances; - while (*ptr && !SameDomainName(&(*ptr)->domain, &d->name)) ptr = &(*ptr)->next; - if (add) - { - // If we don't already have this domain in our list for this registration, add it now - if (!*ptr) register_service_instance(request, &d->name); - else debugf("udsserver_default_reg_domain_changed %##s already in list, not re-adding", &d->name); - } - else - { - // Normally we should not fail to find the specified instance - // One case where this can happen is if a uDNS update fails for some reason, - // and regservice_callback then calls unlink_and_free_service_instance and disposes of that instance. - if (!*ptr) - LogMsg("udsserver_default_reg_domain_changed domain %##s not found for service %#s type %s", - &d->name, request->u.servicereg.name.c, request->u.servicereg.type_as_string); - else - { - DNameListElem *p; - for (p = AutoRegistrationDomains; p; p=p->next) - if (!p->uid || SystemUID(request->uid) || request->uid == p->uid) - if (SameDomainName(&d->name, &p->name)) break; - if (p) debugf("udsserver_default_reg_domain_changed %##s still in list, not removing", &d->name); - else - { - mStatus err; - service_instance *si = *ptr; - *ptr = si->next; - if (si->clientnotified) SendServiceRemovalNotification(&si->srs); // Do this *before* clearing si->request backpointer - // Now that we've cut this service_instance from the list, we MUST clear the si->request backpointer. - // Otherwise what can happen is this: While our mDNS_DeregisterService is in the - // process of completing asynchronously, the client cancels the entire operation, so - // regservice_termination_callback then runs through the whole list deregistering each - // instance, clearing the backpointers, and then disposing the parent request_state object. - // However, because this service_instance isn't in the list any more, regservice_termination_callback - // has no way to find it and clear its backpointer, and then when our mDNS_DeregisterService finally - // completes later with a mStatus_MemFree message, it calls unlink_and_free_service_instance() with - // a service_instance with a stale si->request backpointer pointing to memory that's already been freed. - si->request = NULL; - err = mDNS_DeregisterService(&mDNSStorage, &si->srs); - if (err) { LogMsg("udsserver_default_reg_domain_changed err %d", err); unlink_and_free_service_instance(si); } - } - } - } - } - } - } - -mDNSlocal mStatus handle_regservice_request(request_state *request) - { - char name[256]; // Lots of spare space for extra-long names that we'll auto-truncate down to 63 bytes - char domain[MAX_ESCAPED_DOMAIN_NAME], host[MAX_ESCAPED_DOMAIN_NAME]; - char type_as_string[MAX_ESCAPED_DOMAIN_NAME]; - domainname d, srv; - mStatus err; - - DNSServiceFlags flags = get_flags(&request->msgptr, request->msgend); - mDNSu32 interfaceIndex = get_uint32(&request->msgptr, request->msgend); - mDNSInterfaceID InterfaceID = mDNSPlatformInterfaceIDfromInterfaceIndex(&mDNSStorage, interfaceIndex); - if (interfaceIndex && !InterfaceID) - { LogMsg("ERROR: handle_regservice_request - Couldn't find interfaceIndex %d", interfaceIndex); return(mStatus_BadParamErr); } - - if (get_string(&request->msgptr, request->msgend, name, sizeof(name)) < 0 || - get_string(&request->msgptr, request->msgend, type_as_string, MAX_ESCAPED_DOMAIN_NAME) < 0 || - get_string(&request->msgptr, request->msgend, domain, MAX_ESCAPED_DOMAIN_NAME) < 0 || - get_string(&request->msgptr, request->msgend, host, MAX_ESCAPED_DOMAIN_NAME) < 0) - { LogMsg("ERROR: handle_regservice_request - Couldn't read name/regtype/domain"); return(mStatus_BadParamErr); } - - request->flags = flags; - request->u.servicereg.InterfaceID = InterfaceID; - request->u.servicereg.instances = NULL; - request->u.servicereg.txtlen = 0; - request->u.servicereg.txtdata = NULL; - mDNSPlatformStrCopy(request->u.servicereg.type_as_string, type_as_string); - - if (request->msgptr + 2 > request->msgend) request->msgptr = NULL; - else - { - request->u.servicereg.port.b[0] = *request->msgptr++; - request->u.servicereg.port.b[1] = *request->msgptr++; - } - - request->u.servicereg.txtlen = get_uint16(&request->msgptr, request->msgend); - if (request->u.servicereg.txtlen) - { - request->u.servicereg.txtdata = mallocL("service_info txtdata", request->u.servicereg.txtlen); - if (!request->u.servicereg.txtdata) FatalError("ERROR: handle_regservice_request - malloc"); - mDNSPlatformMemCopy(request->u.servicereg.txtdata, get_rdata(&request->msgptr, request->msgend, request->u.servicereg.txtlen), request->u.servicereg.txtlen); - } - - if (!request->msgptr) { LogMsg("%3d: DNSServiceRegister(unreadable parameters)", request->sd); return(mStatus_BadParamErr); } - - // Check for sub-types after the service type - request->u.servicereg.num_subtypes = ChopSubTypes(request->u.servicereg.type_as_string); // Note: Modifies regtype string to remove trailing subtypes - if (request->u.servicereg.num_subtypes < 0) - { LogMsg("ERROR: handle_regservice_request - ChopSubTypes failed %s", request->u.servicereg.type_as_string); return(mStatus_BadParamErr); } - - // Don't try to construct "domainname t" until *after* ChopSubTypes has worked its magic - if (!*request->u.servicereg.type_as_string || !MakeDomainNameFromDNSNameString(&request->u.servicereg.type, request->u.servicereg.type_as_string)) - { LogMsg("ERROR: handle_regservice_request - type_as_string bad %s", request->u.servicereg.type_as_string); return(mStatus_BadParamErr); } - - if (!name[0]) - { - request->u.servicereg.name = mDNSStorage.nicelabel; - request->u.servicereg.autoname = mDNStrue; - } - else - { - // If the client is allowing AutoRename, then truncate name to legal length before converting it to a DomainLabel - if ((flags & kDNSServiceFlagsNoAutoRename) == 0) - { - int newlen = TruncateUTF8ToLength((mDNSu8*)name, mDNSPlatformStrLen(name), MAX_DOMAIN_LABEL); - name[newlen] = 0; - } - if (!MakeDomainLabelFromLiteralString(&request->u.servicereg.name, name)) - { LogMsg("ERROR: handle_regservice_request - name bad %s", name); return(mStatus_BadParamErr); } - request->u.servicereg.autoname = mDNSfalse; - } - - if (*domain) - { - request->u.servicereg.default_domain = mDNSfalse; - if (!MakeDomainNameFromDNSNameString(&d, domain)) - { LogMsg("ERROR: handle_regservice_request - domain bad %s", domain); return(mStatus_BadParamErr); } - } - else - { - request->u.servicereg.default_domain = mDNStrue; - MakeDomainNameFromDNSNameString(&d, "local."); - } - - if (!ConstructServiceName(&srv, &request->u.servicereg.name, &request->u.servicereg.type, &d)) - { - LogMsg("ERROR: handle_regservice_request - Couldn't ConstructServiceName from, '%#s' '%##s' '%##s'", - request->u.servicereg.name.c, request->u.servicereg.type.c, d.c); return(mStatus_BadParamErr); - } - - if (!MakeDomainNameFromDNSNameString(&request->u.servicereg.host, host)) - { LogMsg("ERROR: handle_regservice_request - host bad %s", host); return(mStatus_BadParamErr); } - request->u.servicereg.autorename = (flags & kDNSServiceFlagsNoAutoRename ) == 0; - request->u.servicereg.allowremotequery = (flags & kDNSServiceFlagsAllowRemoteQuery) != 0; - - // Some clients use mDNS for lightweight copy protection, registering a pseudo-service with - // a port number of zero. When two instances of the protected client are allowed to run on one - // machine, we don't want to see misleading "Bogus client" messages in syslog and the console. - if (!mDNSIPPortIsZero(request->u.servicereg.port)) - { - int count = CountExistingRegistrations(&srv, request->u.servicereg.port); - if (count) - LogMsg("Client application registered %d identical instances of service %##s port %u.", - count+1, srv.c, mDNSVal16(request->u.servicereg.port)); - } - - LogOperation("%3d: DNSServiceRegister(%X, %d, \"%s\", \"%s\", \"%s\", \"%s\", %u) START", - request->sd, flags, interfaceIndex, name, request->u.servicereg.type_as_string, domain, host, mDNSVal16(request->u.servicereg.port)); - - // We need to unconditionally set request->terminate, because even if we didn't successfully - // start any registrations right now, subsequent configuration changes may cause successful - // registrations to be added, and we'll need to cancel them before freeing this memory. - // We also need to set request->terminate first, before adding additional service instances, - // because the uds_validatelists uses the request->terminate function pointer to determine - // what kind of request this is, and therefore what kind of list validation is required. - request->terminate = regservice_termination_callback; - - err = register_service_instance(request, &d); - -#if 0 - err = AuthorizedDomain(request, &d, AutoRegistrationDomains) ? register_service_instance(request, &d) : mStatus_NoError; -#endif - if (!err) - { - if (request->u.servicereg.autoname) UpdateDeviceInfoRecord(&mDNSStorage); - - if (!*domain) - { - DNameListElem *ptr; - // Note that we don't report errors for non-local, non-explicit domains - for (ptr = AutoRegistrationDomains; ptr; ptr = ptr->next) - if (!ptr->uid || SystemUID(request->uid) || request->uid == ptr->uid) - register_service_instance(request, &ptr->name); - } - } - - return(err); - } - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - DNSServiceBrowse -#endif - -mDNSlocal void FoundInstance(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, QC_result AddRecord) - { - const DNSServiceFlags flags = AddRecord ? kDNSServiceFlagsAdd : 0; - request_state *req = question->QuestionContext; - reply_state *rep; - (void)m; // Unused - - if (answer->rrtype != kDNSType_PTR) - { LogMsg("%3d: FoundInstance: Should not be called with rrtype %d (not a PTR record)", req->sd, answer->rrtype); return; } - - if (GenerateNTDResponse(&answer->rdata->u.name, answer->InterfaceID, req, &rep, browse_reply_op, flags, mStatus_NoError) != mStatus_NoError) - { - if (SameDomainName(&req->u.browser.regtype, (const domainname*)"\x09_services\x07_dns-sd\x04_udp")) - { - // Special support to enable the DNSServiceBrowse call made by Bonjour Browser - // Remove after Bonjour Browser is updated to use DNSServiceQueryRecord instead of DNSServiceBrowse - GenerateBonjourBrowserResponse(&answer->rdata->u.name, answer->InterfaceID, req, &rep, browse_reply_op, flags, mStatus_NoError); - goto bonjourbrowserhack; - } - - LogMsg("%3d: FoundInstance: %##s PTR %##s received from network is not valid DNS-SD service pointer", - req->sd, answer->name->c, answer->rdata->u.name.c); - return; - } - -bonjourbrowserhack: - - LogOperation("%3d: DNSServiceBrowse(%##s, %s) RESULT %s %d: %s", - req->sd, question->qname.c, DNSTypeName(question->qtype), AddRecord ? "Add" : "Rmv", - mDNSPlatformInterfaceIndexfromInterfaceID(m, answer->InterfaceID, mDNSfalse), RRDisplayString(m, answer)); - - append_reply(req, rep); - } - -mDNSlocal mStatus add_domain_to_browser(request_state *info, const domainname *d) - { - browser_t *b, *p; - mStatus err; - - for (p = info->u.browser.browsers; p; p = p->next) - { - if (SameDomainName(&p->domain, d)) - { debugf("add_domain_to_browser %##s already in list", d->c); return mStatus_AlreadyRegistered; } - } - - b = mallocL("browser_t", sizeof(*b)); - if (!b) return mStatus_NoMemoryErr; - AssignDomainName(&b->domain, d); - err = mDNS_StartBrowse(&mDNSStorage, &b->q, - &info->u.browser.regtype, d, info->u.browser.interface_id, info->u.browser.ForceMCast, FoundInstance, info); - if (err) - { - LogMsg("mDNS_StartBrowse returned %d for type %##s domain %##s", err, info->u.browser.regtype.c, d->c); - freeL("browser_t/add_domain_to_browser", b); - } - else - { - b->next = info->u.browser.browsers; - info->u.browser.browsers = b; - LogOperation("%3d: DNSServiceBrowse(%##s) START", info->sd, b->q.qname.c); - if (info->u.browser.interface_id == mDNSInterface_P2P || (!info->u.browser.interface_id && SameDomainName(&b->domain, &localdomain) && (info->flags & kDNSServiceFlagsIncludeP2P))) - { - domainname tmp; - ConstructServiceName(&tmp, NULL, &info->u.browser.regtype, &b->domain); - LogInfo("add_domain_to_browser: calling external_start_browsing_for_service()"); - external_start_browsing_for_service(&mDNSStorage, &tmp, kDNSType_PTR); - } - } - return err; - } - -mDNSlocal void browse_termination_callback(request_state *info) - { - while (info->u.browser.browsers) - { - browser_t *ptr = info->u.browser.browsers; - - if (info->u.browser.interface_id == mDNSInterface_P2P || (!info->u.browser.interface_id && SameDomainName(&ptr->domain, &localdomain) && (info->flags & kDNSServiceFlagsIncludeP2P))) - { - domainname tmp; - ConstructServiceName(&tmp, NULL, &info->u.browser.regtype, &ptr->domain); - LogInfo("browse_termination_callback: calling external_stop_browsing_for_service()"); - external_stop_browsing_for_service(&mDNSStorage, &tmp, kDNSType_PTR); - } - - info->u.browser.browsers = ptr->next; - LogOperation("%3d: DNSServiceBrowse(%##s) STOP", info->sd, ptr->q.qname.c); - mDNS_StopBrowse(&mDNSStorage, &ptr->q); // no need to error-check result - freeL("browser_t/browse_termination_callback", ptr); - } - } - -mDNSlocal void udsserver_automatic_browse_domain_changed(const DNameListElem *const d, const mDNSBool add) - { - request_state *request; - debugf("udsserver_automatic_browse_domain_changed: %s default browse domain %##s", add ? "Adding" : "Removing", d->name.c); - -#if APPLE_OSX_mDNSResponder - machserver_automatic_browse_domain_changed(&d->name, add); -#endif // APPLE_OSX_mDNSResponder - - for (request = all_requests; request; request = request->next) - { - if (request->terminate != browse_termination_callback) continue; // Not a browse operation - if (!request->u.browser.default_domain) continue; // Not an auto-browse operation - if (!d->uid || SystemUID(request->uid) || request->uid == d->uid) - { - browser_t **ptr = &request->u.browser.browsers; - while (*ptr && !SameDomainName(&(*ptr)->domain, &d->name)) ptr = &(*ptr)->next; - if (add) - { - // If we don't already have this domain in our list for this browse operation, add it now - if (!*ptr) add_domain_to_browser(request, &d->name); - else debugf("udsserver_automatic_browse_domain_changed %##s already in list, not re-adding", &d->name); - } - else - { - if (!*ptr) LogMsg("udsserver_automatic_browse_domain_changed ERROR %##s not found", &d->name); - else - { - DNameListElem *p; - for (p = AutoBrowseDomains; p; p=p->next) - if (!p->uid || SystemUID(request->uid) || request->uid == p->uid) - if (SameDomainName(&d->name, &p->name)) break; - if (p) debugf("udsserver_automatic_browse_domain_changed %##s still in list, not removing", &d->name); - else - { - browser_t *rem = *ptr; - *ptr = (*ptr)->next; - mDNS_StopQueryWithRemoves(&mDNSStorage, &rem->q); - freeL("browser_t/udsserver_automatic_browse_domain_changed", rem); - } - } - } - } - } - } - -mDNSlocal void FreeARElemCallback(mDNS *const m, AuthRecord *const rr, mStatus result) - { - (void)m; // unused - if (result == mStatus_MemFree) - { - // On shutdown, mDNS_Close automatically deregisters all records - // Since in this case no one has called DeregisterLocalOnlyDomainEnumPTR to cut the record - // from the LocalDomainEnumRecords list, we do this here before we free the memory. - // (This should actually no longer be necessary, now that we do the proper cleanup in - // udsserver_exit. To confirm this, we'll log an error message if we do find a record that - // hasn't been cut from the list yet. If these messages don't appear, we can delete this code.) - ARListElem **ptr = &LocalDomainEnumRecords; - while (*ptr && &(*ptr)->ar != rr) ptr = &(*ptr)->next; - if (*ptr) { *ptr = (*ptr)->next; LogMsg("FreeARElemCallback: Have to cut %s", ARDisplayString(m, rr)); } - mDNSPlatformMemFree(rr->RecordContext); - } - } - -// RegisterLocalOnlyDomainEnumPTR and DeregisterLocalOnlyDomainEnumPTR largely duplicate code in -// "FoundDomain" in uDNS.c for creating and destroying these special mDNSInterface_LocalOnly records. -// We may want to turn the common code into a subroutine. - -mDNSlocal void RegisterLocalOnlyDomainEnumPTR(mDNS *m, const domainname *d, int type) - { - // allocate/register legacy and non-legacy _browse PTR record - mStatus err; - ARListElem *ptr = mDNSPlatformMemAllocate(sizeof(*ptr)); - - debugf("Incrementing %s refcount for %##s", - (type == mDNS_DomainTypeBrowse ) ? "browse domain " : - (type == mDNS_DomainTypeRegistration ) ? "registration dom" : - (type == mDNS_DomainTypeBrowseAutomatic) ? "automatic browse" : "?", d->c); - - mDNS_SetupResourceRecord(&ptr->ar, mDNSNULL, mDNSInterface_LocalOnly, kDNSType_PTR, 7200, kDNSRecordTypeShared, AuthRecordLocalOnly, FreeARElemCallback, ptr); - MakeDomainNameFromDNSNameString(&ptr->ar.namestorage, mDNS_DomainTypeNames[type]); - AppendDNSNameString (&ptr->ar.namestorage, "local"); - AssignDomainName(&ptr->ar.resrec.rdata->u.name, d); - err = mDNS_Register(m, &ptr->ar); - if (err) - { - LogMsg("SetSCPrefsBrowseDomain: mDNS_Register returned error %d", err); - mDNSPlatformMemFree(ptr); - } - else - { - ptr->next = LocalDomainEnumRecords; - LocalDomainEnumRecords = ptr; - } - } - -mDNSlocal void DeregisterLocalOnlyDomainEnumPTR(mDNS *m, const domainname *d, int type) - { - ARListElem **ptr = &LocalDomainEnumRecords; - domainname lhs; // left-hand side of PTR, for comparison - - debugf("Decrementing %s refcount for %##s", - (type == mDNS_DomainTypeBrowse ) ? "browse domain " : - (type == mDNS_DomainTypeRegistration ) ? "registration dom" : - (type == mDNS_DomainTypeBrowseAutomatic) ? "automatic browse" : "?", d->c); - - MakeDomainNameFromDNSNameString(&lhs, mDNS_DomainTypeNames[type]); - AppendDNSNameString (&lhs, "local"); - - while (*ptr) - { - if (SameDomainName(&(*ptr)->ar.resrec.rdata->u.name, d) && SameDomainName((*ptr)->ar.resrec.name, &lhs)) - { - ARListElem *rem = *ptr; - *ptr = (*ptr)->next; - mDNS_Deregister(m, &rem->ar); - return; - } - else ptr = &(*ptr)->next; - } - } - -mDNSlocal void AddAutoBrowseDomain(const mDNSu32 uid, const domainname *const name) - { - DNameListElem *new = mDNSPlatformMemAllocate(sizeof(DNameListElem)); - if (!new) { LogMsg("ERROR: malloc"); return; } - AssignDomainName(&new->name, name); - new->uid = uid; - new->next = AutoBrowseDomains; - AutoBrowseDomains = new; - udsserver_automatic_browse_domain_changed(new, mDNStrue); - } - -mDNSlocal void RmvAutoBrowseDomain(const mDNSu32 uid, const domainname *const name) - { - DNameListElem **p = &AutoBrowseDomains; - while (*p && (!SameDomainName(&(*p)->name, name) || (*p)->uid != uid)) p = &(*p)->next; - if (!*p) LogMsg("RmvAutoBrowseDomain: Got remove event for domain %##s not in list", name->c); - else - { - DNameListElem *ptr = *p; - *p = ptr->next; - udsserver_automatic_browse_domain_changed(ptr, mDNSfalse); - mDNSPlatformMemFree(ptr); - } - } - -mDNSlocal void SetPrefsBrowseDomains(mDNS *m, DNameListElem *browseDomains, mDNSBool add) - { - DNameListElem *d; - for (d = browseDomains; d; d = d->next) - { - if (add) - { - RegisterLocalOnlyDomainEnumPTR(m, &d->name, mDNS_DomainTypeBrowse); - AddAutoBrowseDomain(d->uid, &d->name); - } - else - { - DeregisterLocalOnlyDomainEnumPTR(m, &d->name, mDNS_DomainTypeBrowse); - RmvAutoBrowseDomain(d->uid, &d->name); - } - } - } - -mDNSlocal void UpdateDeviceInfoRecord(mDNS *const m) - { - int num_autoname = 0; - request_state *req; - for (req = all_requests; req; req = req->next) - if (req->terminate == regservice_termination_callback && req->u.servicereg.autoname) - num_autoname++; - - // If DeviceInfo record is currently registered, see if we need to deregister it - if (m->DeviceInfo.resrec.RecordType != kDNSRecordTypeUnregistered) - if (num_autoname == 0 || !SameDomainLabelCS(m->DeviceInfo.resrec.name->c, m->nicelabel.c)) - { - LogOperation("UpdateDeviceInfoRecord Deregister %##s", m->DeviceInfo.resrec.name); - mDNS_Deregister(m, &m->DeviceInfo); - } - - // If DeviceInfo record is not currently registered, see if we need to register it - if (m->DeviceInfo.resrec.RecordType == kDNSRecordTypeUnregistered) - if (num_autoname > 0) - { - mDNSu8 len = m->HIHardware.c[0] < 255 - 6 ? m->HIHardware.c[0] : 255 - 6; - mDNS_SetupResourceRecord(&m->DeviceInfo, mDNSNULL, mDNSNULL, kDNSType_TXT, kStandardTTL, kDNSRecordTypeAdvisory, AuthRecordAny, mDNSNULL, mDNSNULL); - ConstructServiceName(&m->DeviceInfo.namestorage, &m->nicelabel, &DeviceInfoName, &localdomain); - mDNSPlatformMemCopy(m->DeviceInfo.resrec.rdata->u.data + 1, "model=", 6); - mDNSPlatformMemCopy(m->DeviceInfo.resrec.rdata->u.data + 7, m->HIHardware.c + 1, len); - m->DeviceInfo.resrec.rdata->u.data[0] = 6 + len; // "model=" plus the device string - m->DeviceInfo.resrec.rdlength = 7 + len; // One extra for the length byte at the start of the string - LogOperation("UpdateDeviceInfoRecord Register %##s", m->DeviceInfo.resrec.name); - mDNS_Register(m, &m->DeviceInfo); - } - } - -mDNSexport void udsserver_handle_configchange(mDNS *const m) - { - request_state *req; - service_instance *ptr; - DNameListElem *RegDomains = NULL; - DNameListElem *BrowseDomains = NULL; - DNameListElem *p; - - UpdateDeviceInfoRecord(m); - - // For autoname services, see if the default service name has changed, necessitating an automatic update - for (req = all_requests; req; req = req->next) - if (req->terminate == regservice_termination_callback) - if (req->u.servicereg.autoname && !SameDomainLabelCS(req->u.servicereg.name.c, m->nicelabel.c)) - { - req->u.servicereg.name = m->nicelabel; - for (ptr = req->u.servicereg.instances; ptr; ptr = ptr->next) - { - ptr->renameonmemfree = 1; - if (ptr->clientnotified) SendServiceRemovalNotification(&ptr->srs); - LogInfo("udsserver_handle_configchange: Calling deregister for Service %##s", ptr->srs.RR_PTR.resrec.name->c); - if (mDNS_DeregisterService_drt(m, &ptr->srs, mDNS_Dereg_rapid)) - regservice_callback(m, &ptr->srs, mStatus_MemFree); // If service deregistered already, we can re-register immediately - } - } - - // Let the platform layer get the current DNS information - mDNS_Lock(m); - mDNSPlatformSetDNSConfig(m, mDNSfalse, mDNSfalse, mDNSNULL, &RegDomains, &BrowseDomains); - mDNS_Unlock(m); - - // Any automatic registration domains are also implicitly automatic browsing domains - if (RegDomains) SetPrefsBrowseDomains(m, RegDomains, mDNStrue); // Add the new list first - if (AutoRegistrationDomains) SetPrefsBrowseDomains(m, AutoRegistrationDomains, mDNSfalse); // Then clear the old list - - // Add any new domains not already in our AutoRegistrationDomains list - for (p=RegDomains; p; p=p->next) - { - DNameListElem **pp = &AutoRegistrationDomains; - while (*pp && ((*pp)->uid != p->uid || !SameDomainName(&(*pp)->name, &p->name))) pp = &(*pp)->next; - if (!*pp) // If not found in our existing list, this is a new default registration domain - { - RegisterLocalOnlyDomainEnumPTR(m, &p->name, mDNS_DomainTypeRegistration); - udsserver_default_reg_domain_changed(p, mDNStrue); - } - else // else found same domainname in both old and new lists, so no change, just delete old copy - { - DNameListElem *del = *pp; - *pp = (*pp)->next; - mDNSPlatformMemFree(del); - } - } - - // Delete any domains in our old AutoRegistrationDomains list that are now gone - while (AutoRegistrationDomains) - { - DNameListElem *del = AutoRegistrationDomains; - AutoRegistrationDomains = AutoRegistrationDomains->next; // Cut record from list FIRST, - DeregisterLocalOnlyDomainEnumPTR(m, &del->name, mDNS_DomainTypeRegistration); - udsserver_default_reg_domain_changed(del, mDNSfalse); // before calling udsserver_default_reg_domain_changed() - mDNSPlatformMemFree(del); - } - - // Now we have our new updated automatic registration domain list - AutoRegistrationDomains = RegDomains; - - // Add new browse domains to internal list - if (BrowseDomains) SetPrefsBrowseDomains(m, BrowseDomains, mDNStrue); - - // Remove old browse domains from internal list - if (SCPrefBrowseDomains) - { - SetPrefsBrowseDomains(m, SCPrefBrowseDomains, mDNSfalse); - while (SCPrefBrowseDomains) - { - DNameListElem *fptr = SCPrefBrowseDomains; - SCPrefBrowseDomains = SCPrefBrowseDomains->next; - mDNSPlatformMemFree(fptr); - } - } - - // Replace the old browse domains array with the new array - SCPrefBrowseDomains = BrowseDomains; - } - -mDNSlocal void AutomaticBrowseDomainChange(mDNS *const m, DNSQuestion *q, const ResourceRecord *const answer, QC_result AddRecord) - { - (void)m; // unused; - (void)q; // unused - - LogOperation("AutomaticBrowseDomainChange: %s automatic browse domain %##s", - AddRecord ? "Adding" : "Removing", answer->rdata->u.name.c); - - if (AddRecord) AddAutoBrowseDomain(0, &answer->rdata->u.name); - else RmvAutoBrowseDomain(0, &answer->rdata->u.name); - } - -mDNSlocal mStatus handle_browse_request(request_state *request) - { - char regtype[MAX_ESCAPED_DOMAIN_NAME], domain[MAX_ESCAPED_DOMAIN_NAME]; - domainname typedn, d, temp; - mDNSs32 NumSubTypes; - mStatus err = mStatus_NoError; - - DNSServiceFlags flags = get_flags(&request->msgptr, request->msgend); - mDNSu32 interfaceIndex = get_uint32(&request->msgptr, request->msgend); - mDNSInterfaceID InterfaceID = mDNSPlatformInterfaceIDfromInterfaceIndex(&mDNSStorage, interfaceIndex); - if (interfaceIndex && !InterfaceID) return(mStatus_BadParamErr); - - if (get_string(&request->msgptr, request->msgend, regtype, MAX_ESCAPED_DOMAIN_NAME) < 0 || - get_string(&request->msgptr, request->msgend, domain, MAX_ESCAPED_DOMAIN_NAME) < 0) return(mStatus_BadParamErr); - - if (!request->msgptr) { LogMsg("%3d: DNSServiceBrowse(unreadable parameters)", request->sd); return(mStatus_BadParamErr); } - - if (domain[0] == '\0') uDNS_SetupSearchDomains(&mDNSStorage, UDNS_START_WAB_QUERY); - - request->flags = flags; - typedn.c[0] = 0; - NumSubTypes = ChopSubTypes(regtype); // Note: Modifies regtype string to remove trailing subtypes - if (NumSubTypes < 0 || NumSubTypes > 1) return(mStatus_BadParamErr); - if (NumSubTypes == 1 && !AppendDNSNameString(&typedn, regtype + strlen(regtype) + 1)) return(mStatus_BadParamErr); - - if (!regtype[0] || !AppendDNSNameString(&typedn, regtype)) return(mStatus_BadParamErr); - - if (!MakeDomainNameFromDNSNameString(&temp, regtype)) return(mStatus_BadParamErr); - // For over-long service types, we only allow domain "local" - if (temp.c[0] > 15 && domain[0] == 0) mDNSPlatformStrCopy(domain, "local."); - - // Set up browser info - request->u.browser.ForceMCast = (flags & kDNSServiceFlagsForceMulticast) != 0; - request->u.browser.interface_id = InterfaceID; - AssignDomainName(&request->u.browser.regtype, &typedn); - request->u.browser.default_domain = !domain[0]; - request->u.browser.browsers = NULL; - - LogOperation("%3d: DNSServiceBrowse(%X, %d, \"%##s\", \"%s\") START", - request->sd, request->flags, interfaceIndex, request->u.browser.regtype.c, domain); - - // We need to unconditionally set request->terminate, because even if we didn't successfully - // start any browses right now, subsequent configuration changes may cause successful - // browses to be added, and we'll need to cancel them before freeing this memory. - request->terminate = browse_termination_callback; - - if (domain[0]) - { - if (!MakeDomainNameFromDNSNameString(&d, domain)) return(mStatus_BadParamErr); - err = add_domain_to_browser(request, &d); -#if 0 - err = AuthorizedDomain(request, &d, AutoBrowseDomains) ? add_domain_to_browser(request, &d) : mStatus_NoError; -#endif - } - else - { - DNameListElem *sdom; - for (sdom = AutoBrowseDomains; sdom; sdom = sdom->next) - if (!sdom->uid || SystemUID(request->uid) || request->uid == sdom->uid) - { - err = add_domain_to_browser(request, &sdom->name); - if (err) - { - if (SameDomainName(&sdom->name, &localdomain)) break; - else err = mStatus_NoError; // suppress errors for non-local "default" domains - } - } - } - - return(err); - } - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - DNSServiceResolve -#endif - -mDNSlocal void resolve_result_callback(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, QC_result AddRecord) - { - size_t len = 0; - char fullname[MAX_ESCAPED_DOMAIN_NAME], target[MAX_ESCAPED_DOMAIN_NAME]; - char *data; - reply_state *rep; - request_state *req = question->QuestionContext; - (void)m; // Unused - - LogOperation("%3d: DNSServiceResolve(%##s) %s %s", req->sd, question->qname.c, AddRecord ? "ADD" : "RMV", RRDisplayString(m, answer)); - - if (!AddRecord) - { - if (req->u.resolve.srv == answer) req->u.resolve.srv = mDNSNULL; - if (req->u.resolve.txt == answer) req->u.resolve.txt = mDNSNULL; - return; - } - - if (answer->rrtype == kDNSType_SRV) req->u.resolve.srv = answer; - if (answer->rrtype == kDNSType_TXT) req->u.resolve.txt = answer; - - if (!req->u.resolve.txt || !req->u.resolve.srv) return; // only deliver result to client if we have both answers - - ConvertDomainNameToCString(answer->name, fullname); - ConvertDomainNameToCString(&req->u.resolve.srv->rdata->u.srv.target, target); - - // calculate reply length - len += sizeof(DNSServiceFlags); - len += sizeof(mDNSu32); // interface index - len += sizeof(DNSServiceErrorType); - len += strlen(fullname) + 1; - len += strlen(target) + 1; - len += 2 * sizeof(mDNSu16); // port, txtLen - len += req->u.resolve.txt->rdlength; - - // allocate/init reply header - rep = create_reply(resolve_reply_op, len, req); - rep->rhdr->flags = dnssd_htonl(0); - rep->rhdr->ifi = dnssd_htonl(mDNSPlatformInterfaceIndexfromInterfaceID(m, answer->InterfaceID, mDNSfalse)); - rep->rhdr->error = dnssd_htonl(kDNSServiceErr_NoError); - - data = (char *)&rep->rhdr[1]; - - // write reply data to message - put_string(fullname, &data); - put_string(target, &data); - *data++ = req->u.resolve.srv->rdata->u.srv.port.b[0]; - *data++ = req->u.resolve.srv->rdata->u.srv.port.b[1]; - put_uint16(req->u.resolve.txt->rdlength, &data); - put_rdata (req->u.resolve.txt->rdlength, req->u.resolve.txt->rdata->u.data, &data); - - LogOperation("%3d: DNSServiceResolve(%s) RESULT %s:%d", req->sd, fullname, target, mDNSVal16(req->u.resolve.srv->rdata->u.srv.port)); - append_reply(req, rep); - } - -mDNSlocal void resolve_termination_callback(request_state *request) - { - LogOperation("%3d: DNSServiceResolve(%##s) STOP", request->sd, request->u.resolve.qtxt.qname.c); - mDNS_StopQuery(&mDNSStorage, &request->u.resolve.qtxt); - mDNS_StopQuery(&mDNSStorage, &request->u.resolve.qsrv); - if (request->u.resolve.external_advertise) external_stop_resolving_service(&request->u.resolve.qsrv.qname); - } - -mDNSlocal mStatus handle_resolve_request(request_state *request) - { - char name[256], regtype[MAX_ESCAPED_DOMAIN_NAME], domain[MAX_ESCAPED_DOMAIN_NAME]; - domainname fqdn; - mStatus err; - - // extract the data from the message - DNSServiceFlags flags = get_flags(&request->msgptr, request->msgend); - mDNSu32 interfaceIndex = get_uint32(&request->msgptr, request->msgend); - mDNSInterfaceID InterfaceID; - mDNSBool wasP2P = (interfaceIndex == kDNSServiceInterfaceIndexP2P); - - - request->flags = flags; - if (wasP2P) interfaceIndex = kDNSServiceInterfaceIndexAny; - - InterfaceID = mDNSPlatformInterfaceIDfromInterfaceIndex(&mDNSStorage, interfaceIndex); - if (interfaceIndex && !InterfaceID) - { LogMsg("ERROR: handle_resolve_request bad interfaceIndex %d", interfaceIndex); return(mStatus_BadParamErr); } - - if (get_string(&request->msgptr, request->msgend, name, 256) < 0 || - get_string(&request->msgptr, request->msgend, regtype, MAX_ESCAPED_DOMAIN_NAME) < 0 || - get_string(&request->msgptr, request->msgend, domain, MAX_ESCAPED_DOMAIN_NAME) < 0) - { LogMsg("ERROR: handle_resolve_request - Couldn't read name/regtype/domain"); return(mStatus_BadParamErr); } - - if (!request->msgptr) { LogMsg("%3d: DNSServiceResolve(unreadable parameters)", request->sd); return(mStatus_BadParamErr); } - - if (build_domainname_from_strings(&fqdn, name, regtype, domain) < 0) - { LogMsg("ERROR: handle_resolve_request bad '%s' '%s' '%s'", name, regtype, domain); return(mStatus_BadParamErr); } - - mDNSPlatformMemZero(&request->u.resolve, sizeof(request->u.resolve)); - - // format questions - request->u.resolve.qsrv.InterfaceID = InterfaceID; - request->u.resolve.qsrv.Target = zeroAddr; - AssignDomainName(&request->u.resolve.qsrv.qname, &fqdn); - request->u.resolve.qsrv.qtype = kDNSType_SRV; - request->u.resolve.qsrv.qclass = kDNSClass_IN; - request->u.resolve.qsrv.LongLived = (flags & kDNSServiceFlagsLongLivedQuery ) != 0; - request->u.resolve.qsrv.ExpectUnique = mDNStrue; - request->u.resolve.qsrv.ForceMCast = (flags & kDNSServiceFlagsForceMulticast ) != 0; - request->u.resolve.qsrv.ReturnIntermed = (flags & kDNSServiceFlagsReturnIntermediates) != 0; - request->u.resolve.qsrv.SuppressUnusable = mDNSfalse; - request->u.resolve.qsrv.SearchListIndex = 0; - request->u.resolve.qsrv.AppendSearchDomains = 0; - request->u.resolve.qsrv.RetryWithSearchDomains = mDNSfalse; - request->u.resolve.qsrv.TimeoutQuestion = 0; - request->u.resolve.qsrv.WakeOnResolve = (flags & kDNSServiceFlagsWakeOnResolve) != 0; - request->u.resolve.qsrv.qnameOrig = mDNSNULL; - request->u.resolve.qsrv.QuestionCallback = resolve_result_callback; - request->u.resolve.qsrv.QuestionContext = request; - - request->u.resolve.qtxt.InterfaceID = InterfaceID; - request->u.resolve.qtxt.Target = zeroAddr; - AssignDomainName(&request->u.resolve.qtxt.qname, &fqdn); - request->u.resolve.qtxt.qtype = kDNSType_TXT; - request->u.resolve.qtxt.qclass = kDNSClass_IN; - request->u.resolve.qtxt.LongLived = (flags & kDNSServiceFlagsLongLivedQuery ) != 0; - request->u.resolve.qtxt.ExpectUnique = mDNStrue; - request->u.resolve.qtxt.ForceMCast = (flags & kDNSServiceFlagsForceMulticast ) != 0; - request->u.resolve.qtxt.ReturnIntermed = (flags & kDNSServiceFlagsReturnIntermediates) != 0; - request->u.resolve.qtxt.SuppressUnusable = mDNSfalse; - request->u.resolve.qtxt.SearchListIndex = 0; - request->u.resolve.qtxt.AppendSearchDomains = 0; - request->u.resolve.qtxt.RetryWithSearchDomains = mDNSfalse; - request->u.resolve.qtxt.TimeoutQuestion = 0; - request->u.resolve.qtxt.WakeOnResolve = 0; - request->u.resolve.qtxt.qnameOrig = mDNSNULL; - request->u.resolve.qtxt.QuestionCallback = resolve_result_callback; - request->u.resolve.qtxt.QuestionContext = request; - - request->u.resolve.ReportTime = NonZeroTime(mDNS_TimeNow(&mDNSStorage) + 130 * mDNSPlatformOneSecond); - - request->u.resolve.external_advertise = mDNSfalse; - -#if 0 - if (!AuthorizedDomain(request, &fqdn, AutoBrowseDomains)) return(mStatus_NoError); -#endif - - // ask the questions - LogOperation("%3d: DNSServiceResolve(%##s) START", request->sd, request->u.resolve.qsrv.qname.c); - err = mDNS_StartQuery(&mDNSStorage, &request->u.resolve.qsrv); - if (!err) - { - err = mDNS_StartQuery(&mDNSStorage, &request->u.resolve.qtxt); - if (err) mDNS_StopQuery(&mDNSStorage, &request->u.resolve.qsrv); - else - { - request->terminate = resolve_termination_callback; - // If the user explicitly passed in P2P, we don't restrict the domain in which we resolve. - if (wasP2P || (!InterfaceID && IsLocalDomain(&fqdn) && (request->flags & kDNSServiceFlagsIncludeP2P))) - { - request->u.resolve.external_advertise = mDNStrue; - LogInfo("handle_resolve_request: calling external_start_resolving_service()"); - external_start_resolving_service(&fqdn); - } - } - } - - return(err); - } - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - DNSServiceQueryRecord -#endif - -// mDNS operation functions. Each operation has 3 associated functions - a request handler that parses -// the client's request and makes the appropriate mDNSCore call, a result handler (passed as a callback -// to the mDNSCore routine) that sends results back to the client, and a termination routine that aborts -// the mDNSCore operation if the client dies or closes its socket. - -// Returns -1 to tell the caller that it should not try to reissue the query anymore -// Returns 1 on successfully appending a search domain and the caller should reissue the new query -// Returns 0 when there are no more search domains and the caller should reissue the query -mDNSlocal int AppendNewSearchDomain(mDNS *const m, DNSQuestion *question) - { - domainname *sd; - mStatus err; - - // Sanity check: The caller already checks this. We use -1 to indicate that we have searched all - // the domains and should try the single label query directly on the wire. - if (question->SearchListIndex == -1) - { - LogMsg("AppendNewSearchDomain: question %##s (%s) SearchListIndex is -1", question->qname.c, DNSTypeName(question->qtype)); - return -1; - } - - if (!question->AppendSearchDomains) - { - LogMsg("AppendNewSearchDomain: question %##s (%s) AppendSearchDoamins is 0", question->qname.c, DNSTypeName(question->qtype)); - return -1; - } - - // Save the original name, before we modify them below. - if (!question->qnameOrig) - { - question->qnameOrig = mallocL("AppendNewSearchDomain", sizeof(domainname)); - if (!question->qnameOrig) { LogMsg("AppendNewSearchDomain: ERROR!! malloc failure"); return -1; } - question->qnameOrig->c[0] = 0; - AssignDomainName(question->qnameOrig, &question->qname); - LogInfo("AppendSearchDomain: qnameOrig %##s", question->qnameOrig->c); - } - - sd = uDNS_GetNextSearchDomain(m, question->InterfaceID, &question->SearchListIndex, !question->AppendLocalSearchDomains); - // We use -1 to indicate that we have searched all the domains and should try the single label - // query directly on the wire. uDNS_GetNextSearchDomain should never return a negative value - if (question->SearchListIndex == -1) - { - LogMsg("AppendNewSearchDomain: ERROR!! uDNS_GetNextSearchDomain returned -1"); - return -1; - } - - // Not a common case. Perhaps, we should try the next search domain if it exceeds ? - if (sd && (DomainNameLength(question->qnameOrig) + DomainNameLength(sd)) > MAX_DOMAIN_NAME) - { - LogMsg("AppendNewSearchDomain: ERROR!! exceeding max domain length for %##s (%s) SearchDomain %##s length %d, Question name length %d", question->qnameOrig->c, DNSTypeName(question->qtype), sd->c, DomainNameLength(question->qnameOrig), DomainNameLength(sd)); - return -1; - } - - // if there are no more search domains and we have already tried this question - // without appending search domains, then we are done. - if (!sd && !ApplySearchDomainsFirst(question)) - { - LogInfo("AppnedNewSearchDomain: No more search domains for question with name %##s (%s), not trying anymore", question->qname.c, DNSTypeName(question->qtype)); - return -1; - } - - // Stop the question before changing the name as negative cache entries could be pointing at this question. - // Even if we don't change the question in the case of returning 0, the caller is going to restart the - // question. - err = mDNS_StopQuery(&mDNSStorage, question); - if (err) { LogMsg("AppendNewSearchDomain: ERROR!! %##s %s mDNS_StopQuery: %d, while retrying with search domains", question->qname.c, DNSTypeName(question->qtype), (int)err); } - - AssignDomainName(&question->qname, question->qnameOrig); - if (sd) - { - AppendDomainName(&question->qname, sd); - LogInfo("AppnedNewSearchDomain: Returning question with name %##s, SearchListIndex %d", question->qname.c, question->SearchListIndex); - return 1; - } - - // Try the question as single label - LogInfo("AppnedNewSearchDomain: No more search domains for question with name %##s (%s), trying one last time", question->qname.c, DNSTypeName(question->qtype)); - return 0; - } - -#if APPLE_OSX_mDNSResponder - -mDNSlocal mDNSBool DomainInSearchList(domainname *domain) - { - const SearchListElem *s; - for (s=SearchList; s; s=s->next) - if (SameDomainName(&s->domain, domain)) return mDNStrue; - return mDNSfalse; - } - -// Workaround for networks using Microsoft Active Directory using "local" as a private internal -// top-level domain -mDNSlocal mStatus SendAdditionalQuery(DNSQuestion *q, request_state *request, mStatus err) - { - extern domainname ActiveDirectoryPrimaryDomain; - DNSQuestion **question2; - #define VALID_MSAD_SRV_TRANSPORT(T) (SameDomainLabel((T)->c, (const mDNSu8 *)"\x4_tcp") || SameDomainLabel((T)->c, (const mDNSu8 *)"\x4_udp")) - #define VALID_MSAD_SRV(Q) ((Q)->qtype == kDNSType_SRV && VALID_MSAD_SRV_TRANSPORT(SecondLabel(&(Q)->qname))) - - question2 = mDNSNULL; - if (request->hdr.op == query_request) - question2 = &request->u.queryrecord.q2; - else if (request->hdr.op == addrinfo_request) - { - if (q->qtype == kDNSType_A) - question2 = &request->u.addrinfo.q42; - else if (q->qtype == kDNSType_AAAA) - question2 = &request->u.addrinfo.q62; - } - if (!question2) - { - LogMsg("SendAdditionalQuery: question2 NULL for %##s (%s)", q->qname.c, DNSTypeName(q->qtype)); - return mStatus_BadParamErr; - } - - // Sanity check: If we already sent an additonal query, we don't need to send one more. - // - // 1. When the application calls DNSServiceQueryRecord or DNSServiceGetAddrInfo with a .local name, this function - // is called to see whether a unicast query should be sent or not. - // - // 2. As a result of appending search domains, the question may be end up with a .local suffix even though it - // was not a .local name to start with. In that case, queryrecord_result_callback calls this function to - // send the additional query. - // - // Thus, it should not be called more than once. - if (*question2) - { - LogInfo("SendAdditionalQuery: question2 already sent for %##s (%s), no more q2", q->qname.c, DNSTypeName(q->qtype)); - return err; - } - - if (!q->ForceMCast && SameDomainLabel(LastLabel(&q->qname), (const mDNSu8 *)&localdomain)) - if (q->qtype == kDNSType_A || q->qtype == kDNSType_AAAA || VALID_MSAD_SRV(q)) - { - DNSQuestion *q2; - int labels = CountLabels(&q->qname); - q2 = mallocL("DNSQuestion", sizeof(DNSQuestion)); - if (!q2) FatalError("ERROR: SendAdditionalQuery malloc"); - *question2 = q2; - *q2 = *q; - q2->InterfaceID = mDNSInterface_Unicast; - q2->ExpectUnique = mDNStrue; - // If the query starts as a single label e.g., somehost, and we have search domains with .local, - // queryrecord_result_callback calls this function when .local is appended to "somehost". - // At that time, the name in "q" is pointing at somehost.local and its qnameOrig pointing at - // "somehost". We need to copy that information so that when we retry with a different search - // domain e.g., mycompany.local, we get "somehost.mycompany.local". - if (q->qnameOrig) - { - (*question2)->qnameOrig = mallocL("SendAdditionalQuery", DomainNameLength(q->qnameOrig)); - if (!(*question2)->qnameOrig) { LogMsg("SendAdditionalQuery: ERROR!! malloc failure"); return mStatus_NoMemoryErr; } - (*question2)->qnameOrig->c[0] = 0; - AssignDomainName((*question2)->qnameOrig, q->qnameOrig); - LogInfo("SendAdditionalQuery: qnameOrig %##s", (*question2)->qnameOrig->c); - } - // For names of the form ".bar.local." we always do a second unicast query in parallel. - // For names of the form ".local." it's less clear whether we should do a unicast query. - // If the name being queried is exactly the same as the name in the DHCP "domain" option (e.g. the DHCP - // "domain" is my-small-company.local, and the user types "my-small-company.local" into their web browser) - // then that's a hint that it's worth doing a unicast query. Otherwise, we first check to see if the - // site's DNS server claims there's an SOA record for "local", and if so, that's also a hint that queries - // for names in the "local" domain will be safely answered privately before they hit the root name servers. - // Note that in the "my-small-company.local" example above there will typically be an SOA record for - // "my-small-company.local" but *not* for "local", which is why the "local SOA" check would fail in that case. - // We need to check against both ActiveDirectoryPrimaryDomain and SearchList. If it matches against either - // of those, we don't want do the SOA check for the local - if (labels == 2 && !SameDomainName(&q->qname, &ActiveDirectoryPrimaryDomain) && !DomainInSearchList(&q->qname)) - { - AssignDomainName(&q2->qname, &localdomain); - q2->qtype = kDNSType_SOA; - q2->LongLived = mDNSfalse; - q2->ForceMCast = mDNSfalse; - q2->ReturnIntermed = mDNStrue; - // Don't append search domains for the .local SOA query - q2->AppendSearchDomains = 0; - q2->AppendLocalSearchDomains = 0; - q2->RetryWithSearchDomains = mDNSfalse; - q2->SearchListIndex = 0; - q2->TimeoutQuestion = 0; - } - LogOperation("%3d: DNSServiceQueryRecord(%##s, %s) unicast", request->sd, q2->qname.c, DNSTypeName(q2->qtype)); - err = mDNS_StartQuery(&mDNSStorage, q2); - if (err) LogMsg("%3d: ERROR: DNSServiceQueryRecord %##s %s mDNS_StartQuery: %d", request->sd, q2->qname.c, DNSTypeName(q2->qtype), (int)err); - } - return(err); - } -#endif // APPLE_OSX_mDNSResponder - -// This function tries to append a search domain if valid and possible. If so, returns true. -mDNSlocal mDNSBool RetryQuestionWithSearchDomains(mDNS *const m, DNSQuestion *question, request_state *req) - { - int result; - // RetryWithSearchDomains tells the core to call us back so that we can retry with search domains if there is no - // answer in the cache or /etc/hosts. In the first call back from the core, we clear RetryWithSearchDomains so - // that we don't get called back repeatedly. If we got an answer from the cache or /etc/hosts, we don't touch - // RetryWithSearchDomains which may or may not be set. - // - // If we get e.g., NXDOMAIN and the query is neither suppressed nor exhausted the domain search list and - // is a valid question for appending search domains, retry by appending domains - - if (!question->SuppressQuery && question->SearchListIndex != -1 && question->AppendSearchDomains) - { - question->RetryWithSearchDomains = 0; - result = AppendNewSearchDomain(m, question); - // As long as the result is either zero or 1, we retry the question. If we exahaust the search - // domains (result is zero) we try the original query (as it was before appending the search - // domains) as such on the wire as a last resort if we have not tried them before. For queries - // with more than one label, we have already tried them before appending search domains and - // hence don't retry again - if (result != -1) - { - mStatus err; - err = mDNS_StartQuery(m, question); - if (!err) - { - LogOperation("%3d: RetryQuestionWithSearchDomains(%##s, %s), retrying after appending search domain", req->sd, question->qname.c, DNSTypeName(question->qtype)); - // If the result was zero, it meant that there are no search domains and we just retried the question - // as a single label and we should not retry with search domains anymore. - if (!result) question->SearchListIndex = -1; - return mDNStrue; - } - else - { - LogMsg("%3d: ERROR: RetryQuestionWithSearchDomains %##s %s mDNS_StartQuery: %d, while retrying with search domains", req->sd, question->qname.c, DNSTypeName(question->qtype), (int)err); - // We have already stopped the query and could not restart. Reset the appropriate pointers - // so that we don't call stop again when the question terminates - question->QuestionContext = mDNSNULL; - } - } - } - else - { - LogInfo("%3d: RetryQuestionWithSearchDomains: Not appending search domains - SuppressQuery %d, SearchListIndex %d, AppendSearchDomains %d", req->sd, question->SuppressQuery, question->SearchListIndex, question->AppendSearchDomains); - } - return mDNSfalse; - } - -mDNSlocal void queryrecord_result_callback(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, QC_result AddRecord) - { - char name[MAX_ESCAPED_DOMAIN_NAME]; - request_state *req = question->QuestionContext; - reply_state *rep; - char *data; - size_t len; - DNSServiceErrorType error = kDNSServiceErr_NoError; - DNSQuestion *q = mDNSNULL; - -#if APPLE_OSX_mDNSResponder - { - // Sanity check: QuestionContext is set to NULL after we stop the question and hence we should not - // get any callbacks from the core after this. - if (!req) - { - LogMsg("queryrecord_result_callback: ERROR!! QuestionContext NULL for %##s (%s)", question->qname.c, DNSTypeName(question->qtype)); - return; - } - if (req->hdr.op == query_request && question == req->u.queryrecord.q2) - q = &req->u.queryrecord.q; - else if (req->hdr.op == addrinfo_request && question == req->u.addrinfo.q42) - q = &req->u.addrinfo.q4; - else if (req->hdr.op == addrinfo_request && question == req->u.addrinfo.q62) - q = &req->u.addrinfo.q6; - - if (q && question->qtype != q->qtype && !SameDomainName(&question->qname, &q->qname)) - { - mStatus err; - domainname *orig = question->qnameOrig; - - LogInfo("queryrecord_result_callback: Stopping q2 local %##s", question->qname.c); - mDNS_StopQuery(m, question); - question->QuestionContext = mDNSNULL; - - // We got a negative response for the SOA record indicating that .local does not exist. - // But we might have other search domains (that does not end in .local) that can be - // appended to this question. In that case, we want to retry the question. Otherwise, - // we don't want to try this question as unicast. - if (answer->RecordType == kDNSRecordTypePacketNegative && !q->AppendSearchDomains) - { - LogInfo("queryrecord_result_callback: question %##s AppendSearchDomains zero", q->qname.c); - return; - } - - // If we got a non-negative answer for our "local SOA" test query, start an additional parallel unicast query - // - // Note: When we copy the original question, we copy everything including the AppendSearchDomains, - // RetryWithSearchDomains except for qnameOrig which can be non-NULL if the original question is - // e.g., somehost and then we appended e.g., ".local" and retried that question. See comment in - // SendAdditionalQuery as to how qnameOrig gets initialized. - *question = *q; - question->InterfaceID = mDNSInterface_Unicast; - question->ExpectUnique = mDNStrue; - question->qnameOrig = orig; - - LogOperation("%3d: DNSServiceQueryRecord(%##s, %s) unicast, context %p", req->sd, question->qname.c, DNSTypeName(question->qtype), question->QuestionContext); - - // If the original question timed out, its QuestionContext would already be set to NULL and that's what we copied above. - // Hence, we need to set it explicitly here. - question->QuestionContext = req; - err = mDNS_StartQuery(m, question); - if (err) LogMsg("%3d: ERROR: queryrecord_result_callback %##s %s mDNS_StartQuery: %d", req->sd, question->qname.c, DNSTypeName(question->qtype), (int)err); - - // If we got a positive response to local SOA, then try the .local question as unicast - if (answer->RecordType != kDNSRecordTypePacketNegative) return; - - // Fall through and get the next search domain. The question is pointing at .local - // and we don't want to try that. Try the next search domain. Don't try with local - // search domains for the unicast question anymore. - // - // Note: we started the question above which will be stopped immediately (never sent on the wire) - // before we pick the next search domain below. RetryQuestionWithSearchDomains assumes that the - // question has already started. - question->AppendLocalSearchDomains = 0; - } - - if (q && AddRecord && (question->InterfaceID == mDNSInterface_Unicast) && !answer->rdlength) - { - // If we get a negative response to the unicast query that we sent above, retry after appending search domains - // Note: We could have appended search domains below (where do it for regular unicast questions) instead of doing it here. - // As we ignore negative unicast answers below, we would never reach the code where the search domains are appended. - // To keep things simple, we handle unicast ".local" separately here. - LogInfo("queryrecord_result_callback: Retrying .local question %##s (%s) as unicast after appending search domains", question->qname.c, DNSTypeName(question->qtype)); - if (RetryQuestionWithSearchDomains(m, question, req)) - return; - if (question->AppendSearchDomains && !question->AppendLocalSearchDomains && IsLocalDomain(&question->qname)) - { - // If "local" is the last search domain, we need to stop the question so that we don't send the "local" - // question on the wire as we got a negative response for the local SOA. But, we can't stop the question - // yet as we may have to timeout the question (done by the "core") for which we need to leave the question - // in the list. We leave it disabled so that it does not hit the wire. - LogInfo("queryrecord_result_callback: Disabling .local question %##s (%s)", question->qname.c, DNSTypeName(question->qtype)); - question->ThisQInterval = 0; - } - } - // If we are here it means that either "question" is not "q2" OR we got a positive response for "q2" OR we have no more search - // domains to append for "q2". In all cases, fall through and deliver the response - } -#endif // APPLE_OSX_mDNSResponder - - if (answer->RecordType == kDNSRecordTypePacketNegative) - { - // If this question needs to be timed out and we have reached the stop time, mark - // the error as timeout. It is possible that we might get a negative response from an - // external DNS server at the same time when this question reaches its stop time. We - // can't tell the difference as there is no indication in the callback. This should - // be okay as we will be timing out this query anyway. - mDNS_Lock(m); - if (question->TimeoutQuestion) - { - if ((m->timenow - question->StopTime) >= 0) - { - LogInfo("queryrecord_result_callback:Question %##s (%s) timing out, InterfaceID %p", question->qname.c, DNSTypeName(question->qtype), question->InterfaceID); - error = kDNSServiceErr_Timeout; - } - } - mDNS_Unlock(m); - // When we're doing parallel unicast and multicast queries for dot-local names (for supporting Microsoft - // Active Directory sites) we need to ignore negative unicast answers. Otherwise we'll generate negative - // answers for just about every single multicast name we ever look up, since the Microsoft Active Directory - // server is going to assert that pretty much every single multicast name doesn't exist. - // - // If we are timing out this query, we need to deliver the negative answer to the application - if (error != kDNSServiceErr_Timeout) - { - if (!answer->InterfaceID && IsLocalDomain(answer->name)) - { - LogInfo("queryrecord_result_callback:Question %##s (%s) answering local with unicast", question->qname.c, DNSTypeName(question->qtype)); - return; - } - error = kDNSServiceErr_NoSuchRecord; - } - AddRecord = mDNStrue; - } - // If we get a negative answer, try appending search domains. Don't append search domains - // - if we are timing out this question - // - if the negative response was received as a result of a multicast query - // - if this is an additional query (q2), we already appended search domains above (indicated by "!q" below) - if (error != kDNSServiceErr_Timeout) - { - if (!q && !answer->InterfaceID && !answer->rdlength && AddRecord) - { - // If the original question did not end in .local, we did not send an SOA query - // to figure out whether we should send an additional unicast query or not. If we just - // appended .local, we need to see if we need to send an additional query. This should - // normally happen just once because after we append .local, we ignore all negative - // responses for .local above. - LogInfo("queryrecord_result_callback: Retrying question %##s (%s) after appending search domains", question->qname.c, DNSTypeName(question->qtype)); - if (RetryQuestionWithSearchDomains(m, question, req)) - { - // Note: We need to call SendAdditionalQuery every time after appending a search domain as .local could - // be anywhere in the search domain list. -#if APPLE_OSX_mDNSResponder - mStatus err = mStatus_NoError; - err = SendAdditionalQuery(question, req, err); - if (err) LogMsg("queryrecord_result_callback: Sending .local SOA query failed, after appending domains"); -#endif // APPLE_OSX_mDNSResponder - return; - } - } - } - - ConvertDomainNameToCString(answer->name, name); - - LogOperation("%3d: %s(%##s, %s) %s %s", req->sd, - req->hdr.op == query_request ? "DNSServiceQueryRecord" : "DNSServiceGetAddrInfo", - question->qname.c, DNSTypeName(question->qtype), AddRecord ? "ADD" : "RMV", RRDisplayString(m, answer)); - - len = sizeof(DNSServiceFlags); // calculate reply data length - len += sizeof(mDNSu32); // interface index - len += sizeof(DNSServiceErrorType); - len += strlen(name) + 1; - len += 3 * sizeof(mDNSu16); // type, class, rdlen - len += answer->rdlength; - len += sizeof(mDNSu32); // TTL - - rep = create_reply(req->hdr.op == query_request ? query_reply_op : addrinfo_reply_op, len, req); - - rep->rhdr->flags = dnssd_htonl(AddRecord ? kDNSServiceFlagsAdd : 0); - // Call mDNSPlatformInterfaceIndexfromInterfaceID, but suppressNetworkChange (last argument). Otherwise, if the - // InterfaceID is not valid, then it simulates a "NetworkChanged" which in turn makes questions - // to be stopped and started including *this* one. Normally the InterfaceID is valid. But when we - // are using the /etc/hosts entries to answer a question, the InterfaceID may not be known to the - // mDNS core . Eventually, we should remove the calls to "NetworkChanged" in - // mDNSPlatformInterfaceIndexfromInterfaceID when it can't find InterfaceID as ResourceRecords - // should not have existed to answer this question if the corresponding interface is not valid. - rep->rhdr->ifi = dnssd_htonl(mDNSPlatformInterfaceIndexfromInterfaceID(m, answer->InterfaceID, mDNStrue)); - rep->rhdr->error = dnssd_htonl(error); - - data = (char *)&rep->rhdr[1]; - - put_string(name, &data); - put_uint16(answer->rrtype, &data); - put_uint16(answer->rrclass, &data); - put_uint16(answer->rdlength, &data); - // We need to use putRData here instead of the crude put_rdata function, because the crude put_rdata - // function just does a blind memory copy without regard to structures that may have holes in them. - if (answer->rdlength) - if (!putRData(mDNSNULL, (mDNSu8 *)data, (mDNSu8 *)rep->rhdr + len, answer)) - LogMsg("queryrecord_result_callback putRData failed %d", (mDNSu8 *)rep->rhdr + len - (mDNSu8 *)data); - data += answer->rdlength; - put_uint32(AddRecord ? answer->rroriginalttl : 0, &data); - - append_reply(req, rep); - // Stop the question, if we just timed out - if (error == kDNSServiceErr_Timeout) - { - mDNS_StopQuery(m, question); - // Reset the pointers so that we don't call stop on termination - question->QuestionContext = mDNSNULL; - } -#if APPLE_OSX_mDNSResponder -#if ! NO_WCF - CHECK_WCF_FUNCTION(WCFIsServerRunning) - { - struct xucred x; - socklen_t xucredlen = sizeof(x); - - if (WCFIsServerRunning((WCFConnection *)m->WCF) && answer->rdlength != 0) - { - if (getsockopt(req->sd, 0, LOCAL_PEERCRED, &x, &xucredlen) >= 0 && - (x.cr_version == XUCRED_VERSION)) - { - struct sockaddr_storage addr; - const RDataBody2 *const rdb = (RDataBody2 *)answer->rdata->u.data; - addr.ss_len = 0; - if (answer->rrtype == kDNSType_A || answer->rrtype == kDNSType_AAAA) - { - if (answer->rrtype == kDNSType_A) - { - struct sockaddr_in *sin = (struct sockaddr_in *)&addr; - sin->sin_port = 0; - if (!putRData(mDNSNULL, (mDNSu8 *)&sin->sin_addr, (mDNSu8 *)(&sin->sin_addr + sizeof(rdb->ipv4)), answer)) - LogMsg("queryrecord_result_callback: WCF AF_INET putRData failed"); - else - { - addr.ss_len = sizeof (struct sockaddr_in); - addr.ss_family = AF_INET; - } - } - else if (answer->rrtype == kDNSType_AAAA) - { - struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&addr; - sin6->sin6_port = 0; - if (!putRData(mDNSNULL, (mDNSu8 *)&sin6->sin6_addr, (mDNSu8 *)(&sin6->sin6_addr + sizeof(rdb->ipv6)), answer)) - LogMsg("queryrecord_result_callback: WCF AF_INET6 putRData failed"); - else - { - addr.ss_len = sizeof (struct sockaddr_in6); - addr.ss_family = AF_INET6; - } - } - if (addr.ss_len) - { - debugf("queryrecord_result_callback: Name %s, uid %u, addr length %d", name, x.cr_uid, addr.ss_len); - CHECK_WCF_FUNCTION((WCFConnection *)WCFNameResolvesToAddr) - { - WCFNameResolvesToAddr(m->WCF, name, (struct sockaddr *)&addr, x.cr_uid); - } - } - } - else if (answer->rrtype == kDNSType_CNAME) - { - domainname cname; - char cname_cstr[MAX_ESCAPED_DOMAIN_NAME]; - if (!putRData(mDNSNULL, cname.c, (mDNSu8 *)(cname.c + MAX_DOMAIN_NAME), answer)) - LogMsg("queryrecord_result_callback: WCF CNAME putRData failed"); - else - { - ConvertDomainNameToCString(&cname, cname_cstr); - CHECK_WCF_FUNCTION((WCFConnection *)WCFNameResolvesToAddr) - { - WCFNameResolvesToName(m->WCF, name, cname_cstr, x.cr_uid); - } - } - } - } - else my_perror("queryrecord_result_callback: ERROR: getsockopt LOCAL_PEERCRED"); - } - } -#endif -#endif - } - -mDNSlocal void queryrecord_termination_callback(request_state *request) - { - LogOperation("%3d: DNSServiceQueryRecord(%##s, %s) STOP", - request->sd, request->u.queryrecord.q.qname.c, DNSTypeName(request->u.queryrecord.q.qtype)); - if (request->u.queryrecord.q.QuestionContext) - { - mDNS_StopQuery(&mDNSStorage, &request->u.queryrecord.q); // no need to error check - request->u.queryrecord.q.QuestionContext = mDNSNULL; - } - else - { - DNSQuestion *question = &request->u.queryrecord.q; - LogInfo("queryrecord_termination_callback: question %##s (%s) already stopped, InterfaceID %p", question->qname.c, DNSTypeName(question->qtype), question->InterfaceID); - } - - if (request->u.queryrecord.q.qnameOrig) - { - freeL("QueryTermination", request->u.queryrecord.q.qnameOrig); - request->u.queryrecord.q.qnameOrig = mDNSNULL; - } - if (request->u.queryrecord.q.InterfaceID == mDNSInterface_P2P || (!request->u.queryrecord.q.InterfaceID && SameDomainName((const domainname *)LastLabel(&request->u.queryrecord.q.qname), &localdomain) && (request->flags & kDNSServiceFlagsIncludeP2P))) - { - LogInfo("queryrecord_termination_callback: calling external_stop_browsing_for_service()"); - external_stop_browsing_for_service(&mDNSStorage, &request->u.queryrecord.q.qname, request->u.queryrecord.q.qtype); - } - if (request->u.queryrecord.q2) - { - if (request->u.queryrecord.q2->QuestionContext) - { - LogInfo("queryrecord_termination_callback: Stopping q2 %##s", request->u.queryrecord.q2->qname.c); - mDNS_StopQuery(&mDNSStorage, request->u.queryrecord.q2); - } - else - { - DNSQuestion *question = request->u.queryrecord.q2; - LogInfo("queryrecord_termination_callback: q2 %##s (%s) already stopped, InterfaceID %p", question->qname.c, DNSTypeName(question->qtype), question->InterfaceID); - } - if (request->u.queryrecord.q2->qnameOrig) - { - LogInfo("queryrecord_termination_callback: freeing q2 qnameOrig %##s", request->u.queryrecord.q2->qnameOrig->c); - freeL("QueryTermination q2", request->u.queryrecord.q2->qnameOrig); - request->u.queryrecord.q2->qnameOrig = mDNSNULL; - } - freeL("queryrecord Q2", request->u.queryrecord.q2); - request->u.queryrecord.q2 = mDNSNULL; - } - } - -mDNSlocal mStatus handle_queryrecord_request(request_state *request) - { - DNSQuestion *const q = &request->u.queryrecord.q; - char name[256]; - mDNSu16 rrtype, rrclass; - mStatus err; - - DNSServiceFlags flags = get_flags(&request->msgptr, request->msgend); - mDNSu32 interfaceIndex = get_uint32(&request->msgptr, request->msgend); - mDNSInterfaceID InterfaceID = mDNSPlatformInterfaceIDfromInterfaceIndex(&mDNSStorage, interfaceIndex); - if (interfaceIndex && !InterfaceID) return(mStatus_BadParamErr); - - if (get_string(&request->msgptr, request->msgend, name, 256) < 0) return(mStatus_BadParamErr); - rrtype = get_uint16(&request->msgptr, request->msgend); - rrclass = get_uint16(&request->msgptr, request->msgend); - - if (!request->msgptr) - { LogMsg("%3d: DNSServiceQueryRecord(unreadable parameters)", request->sd); return(mStatus_BadParamErr); } - - request->flags = flags; - mDNSPlatformMemZero(&request->u.queryrecord, sizeof(request->u.queryrecord)); - - q->InterfaceID = InterfaceID; - q->Target = zeroAddr; - if (!MakeDomainNameFromDNSNameString(&q->qname, name)) return(mStatus_BadParamErr); -#if 0 - if (!AuthorizedDomain(request, &q->qname, AutoBrowseDomains)) return (mStatus_NoError); -#endif - q->qtype = rrtype; - q->qclass = rrclass; - q->LongLived = (flags & kDNSServiceFlagsLongLivedQuery ) != 0; - q->ExpectUnique = mDNSfalse; - q->ForceMCast = (flags & kDNSServiceFlagsForceMulticast ) != 0; - q->ReturnIntermed = (flags & kDNSServiceFlagsReturnIntermediates) != 0; - q->SuppressUnusable = (flags & kDNSServiceFlagsSuppressUnusable ) != 0; - q->TimeoutQuestion = (flags & kDNSServiceFlagsTimeout ) != 0; - q->WakeOnResolve = 0; - q->QuestionCallback = queryrecord_result_callback; - q->QuestionContext = request; - q->SearchListIndex = 0; - - // Don't append search domains for fully qualified domain names including queries - // such as e.g., "abc." that has only one label. We convert all names to FQDNs as internally - // we only deal with FQDNs. Hence, we cannot look at qname to figure out whether we should - // append search domains or not. So, we record that information in AppendSearchDomains. - // - // We append search domains only for queries that are a single label. If overriden using - // command line argument "AlwaysAppendSearchDomains", then we do it for any query which - // is not fully qualified. - - if ((rrtype == kDNSType_A || rrtype == kDNSType_AAAA) && name[strlen(name) - 1] != '.' && - (AlwaysAppendSearchDomains || CountLabels(&q->qname) == 1)) - { - q->AppendSearchDomains = 1; - q->AppendLocalSearchDomains = 1; - } - else - { - q->AppendSearchDomains = 0; - q->AppendLocalSearchDomains = 0; - } - - // For single label queries that are not fully qualified, look at /etc/hosts, cache and try - // search domains before trying them on the wire as a single label query. RetryWithSearchDomains - // tell the core to call back into the UDS layer if there is no valid response in /etc/hosts or - // the cache - q->RetryWithSearchDomains = ApplySearchDomainsFirst(q) ? 1 : 0; - q->qnameOrig = mDNSNULL; - - LogOperation("%3d: DNSServiceQueryRecord(%X, %d, %##s, %s) START", request->sd, flags, interfaceIndex, q->qname.c, DNSTypeName(q->qtype)); - err = mDNS_StartQuery(&mDNSStorage, q); - if (err) LogMsg("%3d: ERROR: DNSServiceQueryRecord %##s %s mDNS_StartQuery: %d", request->sd, q->qname.c, DNSTypeName(q->qtype), (int)err); - else - { - request->terminate = queryrecord_termination_callback; - if (q->InterfaceID == mDNSInterface_P2P || (!q->InterfaceID && SameDomainName((const domainname *)LastLabel(&q->qname), &localdomain) && (flags & kDNSServiceFlagsIncludeP2P))) - { - LogInfo("handle_queryrecord_request: calling external_start_browsing_for_service()"); - external_start_browsing_for_service(&mDNSStorage, &q->qname, q->qtype); - } - } - -#if APPLE_OSX_mDNSResponder - err = SendAdditionalQuery(q, request, err); -#endif // APPLE_OSX_mDNSResponder - - return(err); - } - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - DNSServiceEnumerateDomains -#endif - -mDNSlocal reply_state *format_enumeration_reply(request_state *request, - const char *domain, DNSServiceFlags flags, mDNSu32 ifi, DNSServiceErrorType err) - { - size_t len; - reply_state *reply; - char *data; - - len = sizeof(DNSServiceFlags); - len += sizeof(mDNSu32); - len += sizeof(DNSServiceErrorType); - len += strlen(domain) + 1; - - reply = create_reply(enumeration_reply_op, len, request); - reply->rhdr->flags = dnssd_htonl(flags); - reply->rhdr->ifi = dnssd_htonl(ifi); - reply->rhdr->error = dnssd_htonl(err); - data = (char *)&reply->rhdr[1]; - put_string(domain, &data); - return reply; - } - -mDNSlocal void enum_termination_callback(request_state *request) - { - mDNS_StopGetDomains(&mDNSStorage, &request->u.enumeration.q_all); - mDNS_StopGetDomains(&mDNSStorage, &request->u.enumeration.q_default); - } - -mDNSlocal void enum_result_callback(mDNS *const m, - DNSQuestion *const question, const ResourceRecord *const answer, QC_result AddRecord) - { - char domain[MAX_ESCAPED_DOMAIN_NAME]; - request_state *request = question->QuestionContext; - DNSServiceFlags flags = 0; - reply_state *reply; - (void)m; // Unused - - if (answer->rrtype != kDNSType_PTR) return; - -#if 0 - if (!AuthorizedDomain(request, &answer->rdata->u.name, request->u.enumeration.flags ? AutoRegistrationDomains : AutoBrowseDomains)) return; -#endif - - // We only return add/remove events for the browse and registration lists - // For the default browse and registration answers, we only give an "ADD" event - if (question == &request->u.enumeration.q_default && !AddRecord) return; - - if (AddRecord) - { - flags |= kDNSServiceFlagsAdd; - if (question == &request->u.enumeration.q_default) flags |= kDNSServiceFlagsDefault; - } - - ConvertDomainNameToCString(&answer->rdata->u.name, domain); - // Note that we do NOT propagate specific interface indexes to the client - for example, a domain we learn from - // a machine's system preferences may be discovered on the LocalOnly interface, but should be browsed on the - // network, so we just pass kDNSServiceInterfaceIndexAny - reply = format_enumeration_reply(request, domain, flags, kDNSServiceInterfaceIndexAny, kDNSServiceErr_NoError); - if (!reply) { LogMsg("ERROR: enum_result_callback, format_enumeration_reply"); return; } - - LogOperation("%3d: DNSServiceEnumerateDomains(%#2s) RESULT %s: %s", request->sd, question->qname.c, AddRecord ? "Add" : "Rmv", domain); - - append_reply(request, reply); - } - -mDNSlocal mStatus handle_enum_request(request_state *request) - { - mStatus err; - DNSServiceFlags flags = get_flags(&request->msgptr, request->msgend); - DNSServiceFlags reg = flags & kDNSServiceFlagsRegistrationDomains; - mDNS_DomainType t_all = reg ? mDNS_DomainTypeRegistration : mDNS_DomainTypeBrowse; - mDNS_DomainType t_default = reg ? mDNS_DomainTypeRegistrationDefault : mDNS_DomainTypeBrowseDefault; - mDNSu32 interfaceIndex = get_uint32(&request->msgptr, request->msgend); - mDNSInterfaceID InterfaceID = mDNSPlatformInterfaceIDfromInterfaceIndex(&mDNSStorage, interfaceIndex); - if (interfaceIndex && !InterfaceID) return(mStatus_BadParamErr); - - if (!request->msgptr) - { LogMsg("%3d: DNSServiceEnumerateDomains(unreadable parameters)", request->sd); return(mStatus_BadParamErr); } - - // allocate context structures - uDNS_SetupSearchDomains(&mDNSStorage, UDNS_START_WAB_QUERY); - -#if 0 - // mark which kind of enumeration we're doing so we can (de)authorize certain domains - request->u.enumeration.flags = reg; -#endif - - // enumeration requires multiple questions, so we must link all the context pointers so that - // necessary context can be reached from the callbacks - request->u.enumeration.q_all .QuestionContext = request; - request->u.enumeration.q_default.QuestionContext = request; - - // if the caller hasn't specified an explicit interface, we use local-only to get the system-wide list. - if (!InterfaceID) InterfaceID = mDNSInterface_LocalOnly; - - // make the calls - LogOperation("%3d: DNSServiceEnumerateDomains(%X=%s)", request->sd, flags, - (flags & kDNSServiceFlagsBrowseDomains ) ? "kDNSServiceFlagsBrowseDomains" : - (flags & kDNSServiceFlagsRegistrationDomains) ? "kDNSServiceFlagsRegistrationDomains" : "<>"); - err = mDNS_GetDomains(&mDNSStorage, &request->u.enumeration.q_all, t_all, NULL, InterfaceID, enum_result_callback, request); - if (!err) - { - err = mDNS_GetDomains(&mDNSStorage, &request->u.enumeration.q_default, t_default, NULL, InterfaceID, enum_result_callback, request); - if (err) mDNS_StopGetDomains(&mDNSStorage, &request->u.enumeration.q_all); - else request->terminate = enum_termination_callback; - } - - return(err); - } - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - DNSServiceReconfirmRecord & Misc -#endif - -mDNSlocal mStatus handle_reconfirm_request(request_state *request) - { - mStatus status = mStatus_BadParamErr; - AuthRecord *rr = read_rr_from_ipc_msg(request, 0, 0); - if (rr) - { - status = mDNS_ReconfirmByValue(&mDNSStorage, &rr->resrec); - LogOperation( - (status == mStatus_NoError) ? - "%3d: DNSServiceReconfirmRecord(%s) interface %d initiated" : - "%3d: DNSServiceReconfirmRecord(%s) interface %d failed: %d", - request->sd, RRDisplayString(&mDNSStorage, &rr->resrec), - mDNSPlatformInterfaceIndexfromInterfaceID(&mDNSStorage, rr->resrec.InterfaceID, mDNSfalse), status); - freeL("AuthRecord/handle_reconfirm_request", rr); - } - return(status); - } - -mDNSlocal mStatus handle_setdomain_request(request_state *request) - { - char domainstr[MAX_ESCAPED_DOMAIN_NAME]; - domainname domain; - DNSServiceFlags flags = get_flags(&request->msgptr, request->msgend); - (void)flags; // Unused - if (get_string(&request->msgptr, request->msgend, domainstr, MAX_ESCAPED_DOMAIN_NAME) < 0 || - !MakeDomainNameFromDNSNameString(&domain, domainstr)) - { LogMsg("%3d: DNSServiceSetDefaultDomainForUser(unreadable parameters)", request->sd); return(mStatus_BadParamErr); } - - LogOperation("%3d: DNSServiceSetDefaultDomainForUser(%##s)", request->sd, domain.c); - return(mStatus_NoError); - } - -typedef packedstruct - { - mStatus err; - mDNSu32 len; - mDNSu32 vers; - } DaemonVersionReply; - -mDNSlocal void handle_getproperty_request(request_state *request) - { - const mStatus BadParamErr = dnssd_htonl((mDNSu32)mStatus_BadParamErr); - char prop[256]; - if (get_string(&request->msgptr, request->msgend, prop, sizeof(prop)) >= 0) - { - LogOperation("%3d: DNSServiceGetProperty(%s)", request->sd, prop); - if (!strcmp(prop, kDNSServiceProperty_DaemonVersion)) - { - DaemonVersionReply x = { 0, dnssd_htonl(4), dnssd_htonl(_DNS_SD_H) }; - send_all(request->sd, (const char *)&x, sizeof(x)); - return; - } - } - - // If we didn't recogize the requested property name, return BadParamErr - send_all(request->sd, (const char *)&BadParamErr, sizeof(BadParamErr)); - } - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - DNSServiceNATPortMappingCreate -#endif - -#define DNSServiceProtocol(X) ((X) == NATOp_AddrRequest ? 0 : (X) == NATOp_MapUDP ? kDNSServiceProtocol_UDP : kDNSServiceProtocol_TCP) - -mDNSlocal void port_mapping_termination_callback(request_state *request) - { - LogOperation("%3d: DNSServiceNATPortMappingCreate(%X, %u, %u, %d) STOP", request->sd, - DNSServiceProtocol(request->u.pm.NATinfo.Protocol), - mDNSVal16(request->u.pm.NATinfo.IntPort), mDNSVal16(request->u.pm.ReqExt), request->u.pm.NATinfo.NATLease); - mDNS_StopNATOperation(&mDNSStorage, &request->u.pm.NATinfo); - } - -// Called via function pointer when we get a NAT-PMP address request or port mapping response -mDNSlocal void port_mapping_create_request_callback(mDNS *m, NATTraversalInfo *n) - { - request_state *request = (request_state *)n->clientContext; - reply_state *rep; - int replyLen; - char *data; - - if (!request) { LogMsg("port_mapping_create_request_callback called with unknown request_state object"); return; } - - // calculate reply data length - replyLen = sizeof(DNSServiceFlags); - replyLen += 3 * sizeof(mDNSu32); // if index + addr + ttl - replyLen += sizeof(DNSServiceErrorType); - replyLen += 2 * sizeof(mDNSu16); // Internal Port + External Port - replyLen += sizeof(mDNSu8); // protocol - - rep = create_reply(port_mapping_reply_op, replyLen, request); - - rep->rhdr->flags = dnssd_htonl(0); - rep->rhdr->ifi = dnssd_htonl(mDNSPlatformInterfaceIndexfromInterfaceID(m, n->InterfaceID, mDNSfalse)); - rep->rhdr->error = dnssd_htonl(n->Result); - - data = (char *)&rep->rhdr[1]; - - *data++ = request->u.pm.NATinfo.ExternalAddress.b[0]; - *data++ = request->u.pm.NATinfo.ExternalAddress.b[1]; - *data++ = request->u.pm.NATinfo.ExternalAddress.b[2]; - *data++ = request->u.pm.NATinfo.ExternalAddress.b[3]; - *data++ = DNSServiceProtocol(request->u.pm.NATinfo.Protocol); - *data++ = request->u.pm.NATinfo.IntPort.b[0]; - *data++ = request->u.pm.NATinfo.IntPort.b[1]; - *data++ = request->u.pm.NATinfo.ExternalPort.b[0]; - *data++ = request->u.pm.NATinfo.ExternalPort.b[1]; - put_uint32(request->u.pm.NATinfo.Lifetime, &data); - - LogOperation("%3d: DNSServiceNATPortMappingCreate(%X, %u, %u, %d) RESULT %.4a:%u TTL %u", request->sd, - DNSServiceProtocol(request->u.pm.NATinfo.Protocol), - mDNSVal16(request->u.pm.NATinfo.IntPort), mDNSVal16(request->u.pm.ReqExt), request->u.pm.NATinfo.NATLease, - &request->u.pm.NATinfo.ExternalAddress, mDNSVal16(request->u.pm.NATinfo.ExternalPort), request->u.pm.NATinfo.Lifetime); - - append_reply(request, rep); - } - -mDNSlocal mStatus handle_port_mapping_request(request_state *request) - { - mDNSu32 ttl = 0; - mStatus err = mStatus_NoError; - - DNSServiceFlags flags = get_flags(&request->msgptr, request->msgend); - mDNSu32 interfaceIndex = get_uint32(&request->msgptr, request->msgend); - mDNSInterfaceID InterfaceID = mDNSPlatformInterfaceIDfromInterfaceIndex(&mDNSStorage, interfaceIndex); - mDNSu8 protocol = (mDNSu8)get_uint32(&request->msgptr, request->msgend); - (void)flags; // Unused - if (interfaceIndex && !InterfaceID) return(mStatus_BadParamErr); - if (request->msgptr + 8 > request->msgend) request->msgptr = NULL; - else - { - request->u.pm.NATinfo.IntPort.b[0] = *request->msgptr++; - request->u.pm.NATinfo.IntPort.b[1] = *request->msgptr++; - request->u.pm.ReqExt.b[0] = *request->msgptr++; - request->u.pm.ReqExt.b[1] = *request->msgptr++; - ttl = get_uint32(&request->msgptr, request->msgend); - } - - if (!request->msgptr) - { LogMsg("%3d: DNSServiceNATPortMappingCreate(unreadable parameters)", request->sd); return(mStatus_BadParamErr); } - - if (protocol == 0) // If protocol == 0 (i.e. just request public address) then IntPort, ExtPort, ttl must be zero too - { - if (!mDNSIPPortIsZero(request->u.pm.NATinfo.IntPort) || !mDNSIPPortIsZero(request->u.pm.ReqExt) || ttl) return(mStatus_BadParamErr); - } - else - { - if (mDNSIPPortIsZero(request->u.pm.NATinfo.IntPort)) return(mStatus_BadParamErr); - if (!(protocol & (kDNSServiceProtocol_UDP | kDNSServiceProtocol_TCP))) return(mStatus_BadParamErr); - } - - request->u.pm.NATinfo.Protocol = !protocol ? NATOp_AddrRequest : (protocol == kDNSServiceProtocol_UDP) ? NATOp_MapUDP : NATOp_MapTCP; - // u.pm.NATinfo.IntPort = already set above - request->u.pm.NATinfo.RequestedPort = request->u.pm.ReqExt; - request->u.pm.NATinfo.NATLease = ttl; - request->u.pm.NATinfo.clientCallback = port_mapping_create_request_callback; - request->u.pm.NATinfo.clientContext = request; - - LogOperation("%3d: DNSServiceNATPortMappingCreate(%X, %u, %u, %d) START", request->sd, - protocol, mDNSVal16(request->u.pm.NATinfo.IntPort), mDNSVal16(request->u.pm.ReqExt), request->u.pm.NATinfo.NATLease); - err = mDNS_StartNATOperation(&mDNSStorage, &request->u.pm.NATinfo); - if (err) LogMsg("ERROR: mDNS_StartNATOperation: %d", (int)err); - else request->terminate = port_mapping_termination_callback; - - return(err); - } - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - DNSServiceGetAddrInfo -#endif - -mDNSlocal void addrinfo_termination_callback(request_state *request) - { - LogOperation("%3d: DNSServiceGetAddrInfo(%##s) STOP", request->sd, request->u.addrinfo.q4.qname.c); - - if (request->u.addrinfo.q4.QuestionContext) - { - mDNS_StopQuery(&mDNSStorage, &request->u.addrinfo.q4); - request->u.addrinfo.q4.QuestionContext = mDNSNULL; - } - if (request->u.addrinfo.q4.qnameOrig) - { - freeL("QueryTermination", request->u.addrinfo.q4.qnameOrig); - request->u.addrinfo.q4.qnameOrig = mDNSNULL; - } - if (request->u.addrinfo.q42) - { - if (request->u.addrinfo.q42->QuestionContext) - { - LogInfo("addrinfo_termination_callback: Stopping q42 %##s", request->u.addrinfo.q42->qname.c); - mDNS_StopQuery(&mDNSStorage, request->u.addrinfo.q42); - } - if (request->u.addrinfo.q42->qnameOrig) - { - LogInfo("addrinfo_termination_callback: freeing q42 qnameOrig %##s", request->u.addrinfo.q42->qnameOrig->c); - freeL("QueryTermination q42", request->u.addrinfo.q42->qnameOrig); - request->u.addrinfo.q42->qnameOrig = mDNSNULL; - } - freeL("addrinfo Q42", request->u.addrinfo.q42); - request->u.addrinfo.q42 = mDNSNULL; - } - - if (request->u.addrinfo.q6.QuestionContext) - { - mDNS_StopQuery(&mDNSStorage, &request->u.addrinfo.q6); - request->u.addrinfo.q6.QuestionContext = mDNSNULL; - } - if (request->u.addrinfo.q6.qnameOrig) - { - freeL("QueryTermination", request->u.addrinfo.q6.qnameOrig); - request->u.addrinfo.q6.qnameOrig = mDNSNULL; - } - if (request->u.addrinfo.q62) - { - if (request->u.addrinfo.q62->QuestionContext) - { - LogInfo("addrinfo_termination_callback: Stopping q62 %##s", request->u.addrinfo.q62->qname.c); - mDNS_StopQuery(&mDNSStorage, request->u.addrinfo.q62); - } - if (request->u.addrinfo.q62->qnameOrig) - { - LogInfo("addrinfo_termination_callback: freeing q62 qnameOrig %##s", request->u.addrinfo.q62->qnameOrig->c); - freeL("QueryTermination q62", request->u.addrinfo.q62->qnameOrig); - request->u.addrinfo.q62->qnameOrig = mDNSNULL; - } - freeL("addrinfo Q62", request->u.addrinfo.q62); - request->u.addrinfo.q62 = mDNSNULL; - } - } - -mDNSlocal mStatus handle_addrinfo_request(request_state *request) - { - char hostname[256]; - domainname d; - mStatus err = 0; - - DNSServiceFlags flags = get_flags(&request->msgptr, request->msgend); - mDNSu32 interfaceIndex = get_uint32(&request->msgptr, request->msgend); - - mDNSPlatformMemZero(&request->u.addrinfo, sizeof(request->u.addrinfo)); - request->u.addrinfo.interface_id = mDNSPlatformInterfaceIDfromInterfaceIndex(&mDNSStorage, interfaceIndex); - request->u.addrinfo.flags = flags; - request->u.addrinfo.protocol = get_uint32(&request->msgptr, request->msgend); - - if (interfaceIndex && !request->u.addrinfo.interface_id) return(mStatus_BadParamErr); - if (request->u.addrinfo.protocol > (kDNSServiceProtocol_IPv4|kDNSServiceProtocol_IPv6)) return(mStatus_BadParamErr); - - if (get_string(&request->msgptr, request->msgend, hostname, 256) < 0) return(mStatus_BadParamErr); - - if (!request->msgptr) { LogMsg("%3d: DNSServiceGetAddrInfo(unreadable parameters)", request->sd); return(mStatus_BadParamErr); } - - if (!MakeDomainNameFromDNSNameString(&d, hostname)) - { LogMsg("ERROR: handle_addrinfo_request: bad hostname: %s", hostname); return(mStatus_BadParamErr); } - -#if 0 - if (!AuthorizedDomain(request, &d, AutoBrowseDomains)) return (mStatus_NoError); -#endif - - if (!request->u.addrinfo.protocol) - { - flags |= kDNSServiceFlagsSuppressUnusable; - request->u.addrinfo.protocol = (kDNSServiceProtocol_IPv4 | kDNSServiceProtocol_IPv6); - } - - request->u.addrinfo.q4.InterfaceID = request->u.addrinfo.q6.InterfaceID = request->u.addrinfo.interface_id; - request->u.addrinfo.q4.Target = request->u.addrinfo.q6.Target = zeroAddr; - request->u.addrinfo.q4.qname = request->u.addrinfo.q6.qname = d; - request->u.addrinfo.q4.qclass = request->u.addrinfo.q6.qclass = kDNSServiceClass_IN; - request->u.addrinfo.q4.LongLived = request->u.addrinfo.q6.LongLived = (flags & kDNSServiceFlagsLongLivedQuery ) != 0; - request->u.addrinfo.q4.ExpectUnique = request->u.addrinfo.q6.ExpectUnique = mDNSfalse; - request->u.addrinfo.q4.ForceMCast = request->u.addrinfo.q6.ForceMCast = (flags & kDNSServiceFlagsForceMulticast ) != 0; - request->u.addrinfo.q4.ReturnIntermed = request->u.addrinfo.q6.ReturnIntermed = (flags & kDNSServiceFlagsReturnIntermediates) != 0; - request->u.addrinfo.q4.SuppressUnusable = request->u.addrinfo.q6.SuppressUnusable = (flags & kDNSServiceFlagsSuppressUnusable ) != 0; - request->u.addrinfo.q4.TimeoutQuestion = request->u.addrinfo.q6.TimeoutQuestion = (flags & kDNSServiceFlagsTimeout ) != 0; - request->u.addrinfo.q4.WakeOnResolve = request->u.addrinfo.q6.WakeOnResolve = 0; - request->u.addrinfo.q4.qnameOrig = request->u.addrinfo.q6.qnameOrig = mDNSNULL; - - if (request->u.addrinfo.protocol & kDNSServiceProtocol_IPv4) - { - request->u.addrinfo.q4.qtype = kDNSServiceType_A; - request->u.addrinfo.q4.SearchListIndex = 0; - - // We append search domains only for queries that are a single label. If overriden using - // command line argument "AlwaysAppendSearchDomains", then we do it for any query which - // is not fully qualified. - if (hostname[strlen(hostname) - 1] != '.' && (AlwaysAppendSearchDomains || CountLabels(&d) == 1)) - { - request->u.addrinfo.q4.AppendSearchDomains = 1; - request->u.addrinfo.q4.AppendLocalSearchDomains = 1; - } - else - { - request->u.addrinfo.q4.AppendSearchDomains = 0; - request->u.addrinfo.q4.AppendLocalSearchDomains = 0; - } - request->u.addrinfo.q4.RetryWithSearchDomains = (ApplySearchDomainsFirst(&request->u.addrinfo.q4) ? 1 : 0); - request->u.addrinfo.q4.QuestionCallback = queryrecord_result_callback; - request->u.addrinfo.q4.QuestionContext = request; - err = mDNS_StartQuery(&mDNSStorage, &request->u.addrinfo.q4); - if (err != mStatus_NoError) - { - LogMsg("ERROR: mDNS_StartQuery: %d", (int)err); - request->u.addrinfo.q4.QuestionContext = mDNSNULL; - } - #if APPLE_OSX_mDNSResponder - err = SendAdditionalQuery(&request->u.addrinfo.q4, request, err); - #endif // APPLE_OSX_mDNSResponder - } - - if (!err && (request->u.addrinfo.protocol & kDNSServiceProtocol_IPv6)) - { - request->u.addrinfo.q6.qtype = kDNSServiceType_AAAA; - request->u.addrinfo.q6.SearchListIndex = 0; - if (hostname[strlen(hostname) - 1] != '.' && (AlwaysAppendSearchDomains || CountLabels(&d) == 1)) - { - request->u.addrinfo.q6.AppendSearchDomains = 1; - request->u.addrinfo.q6.AppendLocalSearchDomains = 1; - } - else - { - request->u.addrinfo.q6.AppendSearchDomains = 0; - request->u.addrinfo.q6.AppendLocalSearchDomains = 0; - } - request->u.addrinfo.q6.RetryWithSearchDomains = (ApplySearchDomainsFirst(&request->u.addrinfo.q6) ? 1 : 0); - request->u.addrinfo.q6.QuestionCallback = queryrecord_result_callback; - request->u.addrinfo.q6.QuestionContext = request; - err = mDNS_StartQuery(&mDNSStorage, &request->u.addrinfo.q6); - if (err != mStatus_NoError) - { - LogMsg("ERROR: mDNS_StartQuery: %d", (int)err); - request->u.addrinfo.q6.QuestionContext = mDNSNULL; - if (request->u.addrinfo.protocol & kDNSServiceProtocol_IPv4) - { - // If we started a query for IPv4, we need to cancel it - mDNS_StopQuery(&mDNSStorage, &request->u.addrinfo.q4); - request->u.addrinfo.q4.QuestionContext = mDNSNULL; - } - } - #if APPLE_OSX_mDNSResponder - err = SendAdditionalQuery(&request->u.addrinfo.q6, request, err); - #endif // APPLE_OSX_mDNSResponder - } - - LogOperation("%3d: DNSServiceGetAddrInfo(%X, %d, %d, %##s) START", - request->sd, flags, interfaceIndex, request->u.addrinfo.protocol, d.c); - - if (!err) request->terminate = addrinfo_termination_callback; - - return(err); - } - -// *************************************************************************** -#if COMPILER_LIKES_PRAGMA_MARK -#pragma mark - -#pragma mark - Main Request Handler etc. -#endif - -mDNSlocal request_state *NewRequest(void) - { - request_state **p = &all_requests; - while (*p) p=&(*p)->next; - *p = mallocL("request_state", sizeof(request_state)); - if (!*p) FatalError("ERROR: malloc"); - mDNSPlatformMemZero(*p, sizeof(request_state)); - return(*p); - } - -// read_msg may be called any time when the transfer state (req->ts) is t_morecoming. -// if there is no data on the socket, the socket will be closed and t_terminated will be returned -mDNSlocal void read_msg(request_state *req) - { - if (req->ts == t_terminated || req->ts == t_error) - { LogMsg("%3d: ERROR: read_msg called with transfer state terminated or error", req->sd); req->ts = t_error; return; } - - if (req->ts == t_complete) // this must be death or something is wrong - { - char buf[4]; // dummy for death notification - int nread = udsSupportReadFD(req->sd, buf, 4, 0, req->platform_data); - if (!nread) { req->ts = t_terminated; return; } - if (nread < 0) goto rerror; - LogMsg("%3d: ERROR: read data from a completed request", req->sd); - req->ts = t_error; - return; - } - - if (req->ts != t_morecoming) - { LogMsg("%3d: ERROR: read_msg called with invalid transfer state (%d)", req->sd, req->ts); req->ts = t_error; return; } - - if (req->hdr_bytes < sizeof(ipc_msg_hdr)) - { - mDNSu32 nleft = sizeof(ipc_msg_hdr) - req->hdr_bytes; - int nread = udsSupportReadFD(req->sd, (char *)&req->hdr + req->hdr_bytes, nleft, 0, req->platform_data); - if (nread == 0) { req->ts = t_terminated; return; } - if (nread < 0) goto rerror; - req->hdr_bytes += nread; - if (req->hdr_bytes > sizeof(ipc_msg_hdr)) - { LogMsg("%3d: ERROR: read_msg - read too many header bytes", req->sd); req->ts = t_error; return; } - - // only read data if header is complete - if (req->hdr_bytes == sizeof(ipc_msg_hdr)) - { - ConvertHeaderBytes(&req->hdr); - if (req->hdr.version != VERSION) - { LogMsg("%3d: ERROR: client version 0x%08X daemon version 0x%08X", req->sd, req->hdr.version, VERSION); req->ts = t_error; return; } - - // Largest conceivable single request is a DNSServiceRegisterRecord() or DNSServiceAddRecord() - // with 64kB of rdata. Adding 1009 byte for a maximal domain name, plus a safety margin - // for other overhead, this means any message above 70kB is definitely bogus. - if (req->hdr.datalen > 70000) - { LogMsg("%3d: ERROR: read_msg: hdr.datalen %u (0x%X) > 70000", req->sd, req->hdr.datalen, req->hdr.datalen); req->ts = t_error; return; } - req->msgbuf = mallocL("request_state msgbuf", req->hdr.datalen + MSG_PAD_BYTES); - if (!req->msgbuf) { my_perror("ERROR: malloc"); req->ts = t_error; return; } - req->msgptr = req->msgbuf; - req->msgend = req->msgbuf + req->hdr.datalen; - mDNSPlatformMemZero(req->msgbuf, req->hdr.datalen + MSG_PAD_BYTES); - } - } - - // If our header is complete, but we're still needing more body data, then try to read it now - // Note: For cancel_request req->hdr.datalen == 0, but there's no error return socket for cancel_request - // Any time we need to get the error return socket we know we'll have at least one data byte - // (even if only the one-byte empty C string placeholder for the old ctrl_path parameter) - if (req->hdr_bytes == sizeof(ipc_msg_hdr) && req->data_bytes < req->hdr.datalen) - { - mDNSu32 nleft = req->hdr.datalen - req->data_bytes; - int nread; -#if !defined(_WIN32) - struct iovec vec = { req->msgbuf + req->data_bytes, nleft }; // Tell recvmsg where we want the bytes put - struct msghdr msg; - struct cmsghdr *cmsg; - char cbuf[CMSG_SPACE(sizeof(dnssd_sock_t))]; - msg.msg_name = 0; - msg.msg_namelen = 0; - msg.msg_iov = &vec; - msg.msg_iovlen = 1; - msg.msg_control = cbuf; - msg.msg_controllen = sizeof(cbuf); - msg.msg_flags = 0; - nread = recvmsg(req->sd, &msg, 0); -#else - nread = udsSupportReadFD(req->sd, (char *)req->msgbuf + req->data_bytes, nleft, 0, req->platform_data); -#endif - if (nread == 0) { req->ts = t_terminated; return; } - if (nread < 0) goto rerror; - req->data_bytes += nread; - if (req->data_bytes > req->hdr.datalen) - { LogMsg("%3d: ERROR: read_msg - read too many data bytes", req->sd); req->ts = t_error; return; } -#if !defined(_WIN32) - cmsg = CMSG_FIRSTHDR(&msg); -#if DEBUG_64BIT_SCM_RIGHTS - LogMsg("%3d: Expecting %d %d %d %d", req->sd, sizeof(cbuf), sizeof(cbuf), SOL_SOCKET, SCM_RIGHTS); - LogMsg("%3d: Got %d %d %d %d", req->sd, msg.msg_controllen, cmsg->cmsg_len, cmsg->cmsg_level, cmsg->cmsg_type); -#endif // DEBUG_64BIT_SCM_RIGHTS - if (msg.msg_controllen == sizeof(cbuf) && - cmsg->cmsg_len == CMSG_LEN(sizeof(dnssd_sock_t)) && - cmsg->cmsg_level == SOL_SOCKET && - cmsg->cmsg_type == SCM_RIGHTS) - { -#if APPLE_OSX_mDNSResponder - // Strictly speaking BPF_fd belongs solely in the platform support layer, but because - // of privilege separation on Mac OS X we need to get BPF_fd from mDNSResponderHelper, - // and it's convenient to repurpose the existing fd-passing code here for that task - if (req->hdr.op == send_bpf) - { - dnssd_sock_t x = *(dnssd_sock_t *)CMSG_DATA(cmsg); - LogOperation("%3d: Got BPF %d", req->sd, x); - mDNSPlatformReceiveBPF_fd(&mDNSStorage, x); - } - else -#endif // APPLE_OSX_mDNSResponder - req->errsd = *(dnssd_sock_t *)CMSG_DATA(cmsg); -#if DEBUG_64BIT_SCM_RIGHTS - LogMsg("%3d: read req->errsd %d", req->sd, req->errsd); -#endif // DEBUG_64BIT_SCM_RIGHTS - if (req->data_bytes < req->hdr.datalen) - { - LogMsg("%3d: Client sent error socket %d via SCM_RIGHTS with req->data_bytes %d < req->hdr.datalen %d", - req->sd, req->errsd, req->data_bytes, req->hdr.datalen); - req->ts = t_error; - return; - } - } -#endif - } - - // If our header and data are both complete, see if we need to make our separate error return socket - if (req->hdr_bytes == sizeof(ipc_msg_hdr) && req->data_bytes == req->hdr.datalen) - { - if (req->terminate && req->hdr.op != cancel_request) - { - dnssd_sockaddr_t cliaddr; -#if defined(USE_TCP_LOOPBACK) - mDNSOpaque16 port; - u_long opt = 1; - port.b[0] = req->msgptr[0]; - port.b[1] = req->msgptr[1]; - req->msgptr += 2; - cliaddr.sin_family = AF_INET; - cliaddr.sin_port = port.NotAnInteger; - cliaddr.sin_addr.s_addr = inet_addr(MDNS_TCP_SERVERADDR); -#else - char ctrl_path[MAX_CTLPATH]; - get_string(&req->msgptr, req->msgend, ctrl_path, MAX_CTLPATH); // path is first element in message buffer - mDNSPlatformMemZero(&cliaddr, sizeof(cliaddr)); - cliaddr.sun_family = AF_LOCAL; - mDNSPlatformStrCopy(cliaddr.sun_path, ctrl_path); - // If the error return path UDS name is empty string, that tells us - // that this is a new version of the library that's going to pass us - // the error return path socket via sendmsg/recvmsg - if (ctrl_path[0] == 0) - { - if (req->errsd == req->sd) - { LogMsg("%3d: read_msg: ERROR failed to get errsd via SCM_RIGHTS", req->sd); req->ts = t_error; return; } - goto got_errfd; - } -#endif - - req->errsd = socket(AF_DNSSD, SOCK_STREAM, 0); - if (!dnssd_SocketValid(req->errsd)) { my_perror("ERROR: socket"); req->ts = t_error; return; } - - if (connect(req->errsd, (struct sockaddr *)&cliaddr, sizeof(cliaddr)) < 0) - { -#if !defined(USE_TCP_LOOPBACK) - struct stat sb; - LogMsg("%3d: read_msg: Couldn't connect to error return path socket '%s' errno %d (%s)", - req->sd, cliaddr.sun_path, dnssd_errno, dnssd_strerror(dnssd_errno)); - if (stat(cliaddr.sun_path, &sb) < 0) - LogMsg("%3d: read_msg: stat failed '%s' errno %d (%s)", req->sd, cliaddr.sun_path, dnssd_errno, dnssd_strerror(dnssd_errno)); - else - LogMsg("%3d: read_msg: file '%s' mode %o (octal) uid %d gid %d", req->sd, cliaddr.sun_path, sb.st_mode, sb.st_uid, sb.st_gid); -#endif - req->ts = t_error; - return; - } - -#if !defined(USE_TCP_LOOPBACK) -got_errfd: -#endif - LogOperation("%3d: Error socket %d created %08X %08X", req->sd, req->errsd, req->hdr.client_context.u32[1], req->hdr.client_context.u32[0]); -#if defined(_WIN32) - if (ioctlsocket(req->errsd, FIONBIO, &opt) != 0) -#else - if (fcntl(req->errsd, F_SETFL, fcntl(req->errsd, F_GETFL, 0) | O_NONBLOCK) != 0) -#endif - { - LogMsg("%3d: ERROR: could not set control socket to non-blocking mode errno %d (%s)", - req->sd, dnssd_errno, dnssd_strerror(dnssd_errno)); - req->ts = t_error; - return; - } - } - - req->ts = t_complete; - } - - return; - -rerror: - if (dnssd_errno == dnssd_EWOULDBLOCK || dnssd_errno == dnssd_EINTR) return; - LogMsg("%3d: ERROR: read_msg errno %d (%s)", req->sd, dnssd_errno, dnssd_strerror(dnssd_errno)); - req->ts = t_error; - } - -#define RecordOrientedOp(X) \ - ((X) == reg_record_request || (X) == add_record_request || (X) == update_record_request || (X) == remove_record_request) - -// The lightweight operations are the ones that don't need a dedicated request_state structure allocated for them -#define LightweightOp(X) (RecordOrientedOp(X) || (X) == cancel_request) - -mDNSlocal void request_callback(int fd, short filter, void *info) - { - mStatus err = 0; - request_state *req = info; - mDNSs32 min_size = sizeof(DNSServiceFlags); - (void)fd; // Unused - (void)filter; // Unused - - for (;;) - { - read_msg(req); - if (req->ts == t_morecoming) return; - if (req->ts == t_terminated || req->ts == t_error) { AbortUnlinkAndFree(req); return; } - if (req->ts != t_complete) { LogMsg("req->ts %d != t_complete", req->ts); AbortUnlinkAndFree(req); return; } - - if (req->hdr.version != VERSION) - { - LogMsg("ERROR: client version %d incompatible with daemon version %d", req->hdr.version, VERSION); - AbortUnlinkAndFree(req); - return; - } - - switch(req->hdr.op) // Interface + other data - { - case connection_request: min_size = 0; break; - case reg_service_request: min_size += sizeof(mDNSu32) + 4 /* name, type, domain, host */ + 4 /* port, textlen */; break; - case add_record_request: min_size += 4 /* type, rdlen */ + 4 /* ttl */; break; - case update_record_request: min_size += 2 /* rdlen */ + 4 /* ttl */; break; - case remove_record_request: break; - case browse_request: min_size += sizeof(mDNSu32) + 2 /* type, domain */; break; - case resolve_request: min_size += sizeof(mDNSu32) + 3 /* type, type, domain */; break; - case query_request: min_size += sizeof(mDNSu32) + 1 /* name */ + 4 /* type, class*/; break; - case enumeration_request: min_size += sizeof(mDNSu32); break; - case reg_record_request: min_size += sizeof(mDNSu32) + 1 /* name */ + 6 /* type, class, rdlen */ + 4 /* ttl */; break; - case reconfirm_record_request: min_size += sizeof(mDNSu32) + 1 /* name */ + 6 /* type, class, rdlen */; break; - case setdomain_request: min_size += 1 /* domain */; break; - case getproperty_request: min_size = 2; break; - case port_mapping_request: min_size += sizeof(mDNSu32) + 4 /* udp/tcp */ + 4 /* int/ext port */ + 4 /* ttl */; break; - case addrinfo_request: min_size += sizeof(mDNSu32) + 4 /* v4/v6 */ + 1 /* hostname */; break; - case send_bpf: // Same as cancel_request below - case cancel_request: min_size = 0; break; - default: LogMsg("ERROR: validate_message - unsupported req type: %d", req->hdr.op); min_size = -1; break; - } - - if ((mDNSs32)req->data_bytes < min_size) - { LogMsg("Invalid message %d bytes; min for %d is %d", req->data_bytes, req->hdr.op, min_size); AbortUnlinkAndFree(req); return; } - - if (LightweightOp(req->hdr.op) && !req->terminate) - { LogMsg("Reg/Add/Update/Remove %d require existing connection", req->hdr.op); AbortUnlinkAndFree(req); return; } - - // check if client wants silent operation - if (req->hdr.ipc_flags & IPC_FLAGS_NOREPLY) req->no_reply = 1; - - // If req->terminate is already set, this means this operation is sharing an existing connection - if (req->terminate && !LightweightOp(req->hdr.op)) - { - request_state *newreq = NewRequest(); - newreq->primary = req; - newreq->sd = req->sd; - newreq->errsd = req->errsd; - newreq->uid = req->uid; - newreq->hdr = req->hdr; - newreq->msgbuf = req->msgbuf; - newreq->msgptr = req->msgptr; - newreq->msgend = req->msgend; - req = newreq; - } - - // If we're shutting down, don't allow new client requests - // We do allow "cancel" and "getproperty" during shutdown - if (mDNSStorage.ShutdownTime && req->hdr.op != cancel_request && req->hdr.op != getproperty_request) - { - err = mStatus_ServiceNotRunning; - } - else switch(req->hdr.op) - { - // These are all operations that have their own first-class request_state object - case connection_request: LogOperation("%3d: DNSServiceCreateConnection START", req->sd); - req->terminate = connection_termination; break; - case resolve_request: err = handle_resolve_request (req); break; - case query_request: err = handle_queryrecord_request (req); break; - case browse_request: err = handle_browse_request (req); break; - case reg_service_request: err = handle_regservice_request (req); break; - case enumeration_request: err = handle_enum_request (req); break; - case reconfirm_record_request: err = handle_reconfirm_request (req); break; - case setdomain_request: err = handle_setdomain_request (req); break; - case getproperty_request: handle_getproperty_request (req); break; - case port_mapping_request: err = handle_port_mapping_request(req); break; - case addrinfo_request: err = handle_addrinfo_request (req); break; - case send_bpf: /* Do nothing for send_bpf */ break; - - // These are all operations that work with an existing request_state object - case reg_record_request: err = handle_regrecord_request (req); break; - case add_record_request: err = handle_add_request (req); break; - case update_record_request: err = handle_update_request (req); break; - case remove_record_request: err = handle_removerecord_request(req); break; - case cancel_request: handle_cancel_request (req); break; - default: LogMsg("%3d: ERROR: Unsupported UDS req: %d", req->sd, req->hdr.op); - } - - // req->msgbuf may be NULL, e.g. for connection_request or remove_record_request - if (req->msgbuf) freeL("request_state msgbuf", req->msgbuf); - - // There's no return data for a cancel request (DNSServiceRefDeallocate returns no result) - // For a DNSServiceGetProperty call, the handler already generated the response, so no need to do it again here - if (req->hdr.op != cancel_request && req->hdr.op != getproperty_request && req->hdr.op != send_bpf) - { - const mStatus err_netorder = dnssd_htonl(err); - send_all(req->errsd, (const char *)&err_netorder, sizeof(err_netorder)); - if (req->errsd != req->sd) - { - LogOperation("%3d: Error socket %d closed %08X %08X (%d)", - req->sd, req->errsd, req->hdr.client_context.u32[1], req->hdr.client_context.u32[0], err); - dnssd_close(req->errsd); - req->errsd = req->sd; - // Also need to reset the parent's errsd, if this is a subordinate operation - if (req->primary) req->primary->errsd = req->primary->sd; - } - } - - // Reset ready to accept the next req on this pipe - if (req->primary) req = req->primary; - req->ts = t_morecoming; - req->hdr_bytes = 0; - req->data_bytes = 0; - req->msgbuf = mDNSNULL; - req->msgptr = mDNSNULL; - req->msgend = 0; - } - } - -mDNSlocal void connect_callback(int fd, short filter, void *info) - { - dnssd_sockaddr_t cliaddr; - dnssd_socklen_t len = (dnssd_socklen_t) sizeof(cliaddr); - dnssd_sock_t sd = accept(fd, (struct sockaddr*) &cliaddr, &len); -#if defined(SO_NOSIGPIPE) || defined(_WIN32) - unsigned long optval = 1; -#endif - - (void)filter; // Unused - (void)info; // Unused - - if (!dnssd_SocketValid(sd)) - { - if (dnssd_errno != dnssd_EWOULDBLOCK) my_perror("ERROR: accept"); - return; - } - -#ifdef SO_NOSIGPIPE - // Some environments (e.g. OS X) support turning off SIGPIPE for a socket - if (setsockopt(sd, SOL_SOCKET, SO_NOSIGPIPE, &optval, sizeof(optval)) < 0) - LogMsg("%3d: WARNING: setsockopt - SO_NOSIGPIPE %d (%s)", sd, dnssd_errno, dnssd_strerror(dnssd_errno)); -#endif - -#if defined(_WIN32) - if (ioctlsocket(sd, FIONBIO, &optval) != 0) -#else - if (fcntl(sd, F_SETFL, fcntl(sd, F_GETFL, 0) | O_NONBLOCK) != 0) -#endif - { - my_perror("ERROR: fcntl(sd, F_SETFL, O_NONBLOCK) - aborting client"); - dnssd_close(sd); - return; - } - else - { - request_state *request = NewRequest(); - request->ts = t_morecoming; - request->sd = sd; - request->errsd = sd; -#if APPLE_OSX_mDNSResponder - struct xucred x; - socklen_t xucredlen = sizeof(x); - if (getsockopt(sd, 0, LOCAL_PEERCRED, &x, &xucredlen) >= 0 && x.cr_version == XUCRED_VERSION) request->uid = x.cr_uid; - else my_perror("ERROR: getsockopt, LOCAL_PEERCRED"); - debugf("LOCAL_PEERCRED %d %u %u %d", xucredlen, x.cr_version, x.cr_uid, x.cr_ngroups); -#endif // APPLE_OSX_mDNSResponder - LogOperation("%3d: Adding FD for uid %u", request->sd, request->uid); - udsSupportAddFDToEventLoop(sd, request_callback, request, &request->platform_data); - } - } - -mDNSlocal mDNSBool uds_socket_setup(dnssd_sock_t skt) - { -#if defined(SO_NP_EXTENSIONS) - struct so_np_extensions sonpx; - socklen_t optlen = sizeof(struct so_np_extensions); - sonpx.npx_flags = SONPX_SETOPTSHUT; - sonpx.npx_mask = SONPX_SETOPTSHUT; - if (setsockopt(skt, SOL_SOCKET, SO_NP_EXTENSIONS, &sonpx, optlen) < 0) - my_perror("WARNING: could not set sockopt - SO_NP_EXTENSIONS"); -#endif -#if defined(_WIN32) - // SEH: do we even need to do this on windows? - // This socket will be given to WSAEventSelect which will automatically set it to non-blocking - u_long opt = 1; - if (ioctlsocket(skt, FIONBIO, &opt) != 0) -#else - if (fcntl(skt, F_SETFL, fcntl(skt, F_GETFL, 0) | O_NONBLOCK) != 0) -#endif - { - my_perror("ERROR: could not set listen socket to non-blocking mode"); - return mDNSfalse; - } - - if (listen(skt, LISTENQ) != 0) - { - my_perror("ERROR: could not listen on listen socket"); - return mDNSfalse; - } - - if (mStatus_NoError != udsSupportAddFDToEventLoop(skt, connect_callback, (void *) NULL, (void **) NULL)) - { - my_perror("ERROR: could not add listen socket to event loop"); - return mDNSfalse; - } - else LogOperation("%3d: Listening for incoming Unix Domain Socket client requests", skt); - - return mDNStrue; - } - -mDNSexport int udsserver_init(dnssd_sock_t skts[], mDNSu32 count) - { - dnssd_sockaddr_t laddr; - int ret; - mDNSu32 i = 0; - - LogInfo("udsserver_init"); - - // If a particular platform wants to opt out of having a PID file, define PID_FILE to be "" - if (PID_FILE[0]) - { - FILE *fp = fopen(PID_FILE, "w"); - if (fp != NULL) - { - fprintf(fp, "%d\n", getpid()); - fclose(fp); - } - } - - if (skts) - { - for (i = 0; i < count; i++) - if (dnssd_SocketValid(skts[i]) && !uds_socket_setup(skts[i])) - goto error; - } - else - { - listenfd = socket(AF_DNSSD, SOCK_STREAM, 0); - if (!dnssd_SocketValid(listenfd)) - { - my_perror("ERROR: socket(AF_DNSSD, SOCK_STREAM, 0); failed"); - goto error; - } - - mDNSPlatformMemZero(&laddr, sizeof(laddr)); - - #if defined(USE_TCP_LOOPBACK) - { - laddr.sin_family = AF_INET; - laddr.sin_port = htons(MDNS_TCP_SERVERPORT); - laddr.sin_addr.s_addr = inet_addr(MDNS_TCP_SERVERADDR); - ret = bind(listenfd, (struct sockaddr *) &laddr, sizeof(laddr)); - if (ret < 0) - { - my_perror("ERROR: bind(listenfd, (struct sockaddr *) &laddr, sizeof(laddr)); failed"); - goto error; - } - } - #else - { - mode_t mask = umask(0); - unlink(MDNS_UDS_SERVERPATH); // OK if this fails - laddr.sun_family = AF_LOCAL; - #ifndef NOT_HAVE_SA_LEN - // According to Stevens (section 3.2), there is no portable way to - // determine whether sa_len is defined on a particular platform. - laddr.sun_len = sizeof(struct sockaddr_un); - #endif - mDNSPlatformStrCopy(laddr.sun_path, MDNS_UDS_SERVERPATH); - ret = bind(listenfd, (struct sockaddr *) &laddr, sizeof(laddr)); - umask(mask); - if (ret < 0) - { - my_perror("ERROR: bind(listenfd, (struct sockaddr *) &laddr, sizeof(laddr)); failed"); - goto error; - } - } - #endif - - if (!uds_socket_setup(listenfd)) goto error; - } - -#if !defined(PLATFORM_NO_RLIMIT) - { - // Set maximum number of open file descriptors - #define MIN_OPENFILES 10240 - struct rlimit maxfds, newfds; - - // Due to bugs in OS X (, , ) - // you have to get and set rlimits once before getrlimit will return sensible values - if (getrlimit(RLIMIT_NOFILE, &maxfds) < 0) { my_perror("ERROR: Unable to get file descriptor limit"); return 0; } - if (setrlimit(RLIMIT_NOFILE, &maxfds) < 0) my_perror("ERROR: Unable to set maximum file descriptor limit"); - - if (getrlimit(RLIMIT_NOFILE, &maxfds) < 0) { my_perror("ERROR: Unable to get file descriptor limit"); return 0; } - newfds.rlim_max = (maxfds.rlim_max > MIN_OPENFILES) ? maxfds.rlim_max : MIN_OPENFILES; - newfds.rlim_cur = (maxfds.rlim_cur > MIN_OPENFILES) ? maxfds.rlim_cur : MIN_OPENFILES; - if (newfds.rlim_max != maxfds.rlim_max || newfds.rlim_cur != maxfds.rlim_cur) - if (setrlimit(RLIMIT_NOFILE, &newfds) < 0) my_perror("ERROR: Unable to set maximum file descriptor limit"); - - if (getrlimit(RLIMIT_NOFILE, &maxfds) < 0) { my_perror("ERROR: Unable to get file descriptor limit"); return 0; } - debugf("maxfds.rlim_max %d", (long)maxfds.rlim_max); - debugf("maxfds.rlim_cur %d", (long)maxfds.rlim_cur); - } -#endif - - // We start a "LocalOnly" query looking for Automatic Browse Domain records. - // When Domain Enumeration in uDNS.c finds an "lb" record from the network, its "FoundDomain" routine - // creates a "LocalOnly" record, which results in our AutomaticBrowseDomainChange callback being invoked - mDNS_GetDomains(&mDNSStorage, &mDNSStorage.AutomaticBrowseDomainQ, mDNS_DomainTypeBrowseAutomatic, - mDNSNULL, mDNSInterface_LocalOnly, AutomaticBrowseDomainChange, mDNSNULL); - - // Add "local" as recommended registration domain ("dns-sd -E"), recommended browsing domain ("dns-sd -F"), and automatic browsing domain - RegisterLocalOnlyDomainEnumPTR(&mDNSStorage, &localdomain, mDNS_DomainTypeRegistration); - RegisterLocalOnlyDomainEnumPTR(&mDNSStorage, &localdomain, mDNS_DomainTypeBrowse); - AddAutoBrowseDomain(0, &localdomain); - - udsserver_handle_configchange(&mDNSStorage); - return 0; - -error: - - my_perror("ERROR: udsserver_init"); - return -1; - } - -mDNSexport int udsserver_exit(void) - { - // Cancel all outstanding client requests - while (all_requests) AbortUnlinkAndFree(all_requests); - - // Clean up any special mDNSInterface_LocalOnly records we created, both the entries for "local" we - // created in udsserver_init, and others we created as a result of reading local configuration data - while (LocalDomainEnumRecords) - { - ARListElem *rem = LocalDomainEnumRecords; - LocalDomainEnumRecords = LocalDomainEnumRecords->next; - mDNS_Deregister(&mDNSStorage, &rem->ar); - } - - // If the launching environment created no listening socket, - // that means we created it ourselves, so we should clean it up on exit - if (dnssd_SocketValid(listenfd)) - { - dnssd_close(listenfd); -#if !defined(USE_TCP_LOOPBACK) - // Currently, we're unable to remove /var/run/mdnsd because we've changed to userid "nobody" - // to give up unnecessary privilege, but we need to be root to remove this Unix Domain Socket. - // It would be nice if we could find a solution to this problem - if (unlink(MDNS_UDS_SERVERPATH)) - debugf("Unable to remove %s", MDNS_UDS_SERVERPATH); -#endif - } - - if (PID_FILE[0]) unlink(PID_FILE); - - return 0; - } - -mDNSlocal void LogClientInfo(mDNS *const m, const request_state *req) - { - char prefix[16]; - if (req->primary) mDNS_snprintf(prefix, sizeof(prefix), " -> "); - else mDNS_snprintf(prefix, sizeof(prefix), "%3d:", req->sd); - - usleep((m->KnownBugs & mDNS_KnownBug_LossySyslog) ? 3333 : 1000); - - if (!req->terminate) - LogMsgNoIdent("%s No operation yet on this socket", prefix); - else if (req->terminate == connection_termination) - { - int num_records = 0, num_ops = 0; - const registered_record_entry *p; - const request_state *r; - for (p = req->u.reg_recs; p; p=p->next) num_records++; - for (r = req->next; r; r=r->next) if (r->primary == req) num_ops++; - LogMsgNoIdent("%s DNSServiceCreateConnection: %d registered record%s, %d kDNSServiceFlagsShareConnection operation%s", prefix, - num_records, num_records != 1 ? "s" : "", - num_ops, num_ops != 1 ? "s" : ""); - for (p = req->u.reg_recs; p; p=p->next) - LogMsgNoIdent(" -> DNSServiceRegisterRecord %3d %s", p->key, ARDisplayString(m, p->rr)); - for (r = req->next; r; r=r->next) if (r->primary == req) LogClientInfo(m, r); - } - else if (req->terminate == regservice_termination_callback) - { - service_instance *ptr; - for (ptr = req->u.servicereg.instances; ptr; ptr = ptr->next) - LogMsgNoIdent("%s DNSServiceRegister %##s %u/%u", - (ptr == req->u.servicereg.instances) ? prefix : " ", - ptr->srs.RR_SRV.resrec.name->c, mDNSVal16(req->u.servicereg.port), SRS_PORT(&ptr->srs)); - } - else if (req->terminate == browse_termination_callback) - { - browser_t *blist; - for (blist = req->u.browser.browsers; blist; blist = blist->next) - LogMsgNoIdent("%s DNSServiceBrowse %##s", (blist == req->u.browser.browsers) ? prefix : " ", blist->q.qname.c); - } - else if (req->terminate == resolve_termination_callback) - LogMsgNoIdent("%s DNSServiceResolve %##s", prefix, req->u.resolve.qsrv.qname.c); - else if (req->terminate == queryrecord_termination_callback) - LogMsgNoIdent("%s DNSServiceQueryRecord %##s (%s)", prefix, req->u.queryrecord.q.qname.c, DNSTypeName(req->u.queryrecord.q.qtype)); - else if (req->terminate == enum_termination_callback) - LogMsgNoIdent("%s DNSServiceEnumerateDomains %##s", prefix, req->u.enumeration.q_all.qname.c); - else if (req->terminate == port_mapping_termination_callback) - LogMsgNoIdent("%s DNSServiceNATPortMapping %.4a %s%s Int %d Req %d Ext %d Req TTL %d Granted TTL %d", - prefix, - &req->u.pm.NATinfo.ExternalAddress, - req->u.pm.NATinfo.Protocol & NATOp_MapTCP ? "TCP" : " ", - req->u.pm.NATinfo.Protocol & NATOp_MapUDP ? "UDP" : " ", - mDNSVal16(req->u.pm.NATinfo.IntPort), - mDNSVal16(req->u.pm.ReqExt), - mDNSVal16(req->u.pm.NATinfo.ExternalPort), - req->u.pm.NATinfo.NATLease, - req->u.pm.NATinfo.Lifetime); - else if (req->terminate == addrinfo_termination_callback) - LogMsgNoIdent("%s DNSServiceGetAddrInfo %s%s %##s", prefix, - req->u.addrinfo.protocol & kDNSServiceProtocol_IPv4 ? "v4" : " ", - req->u.addrinfo.protocol & kDNSServiceProtocol_IPv6 ? "v6" : " ", - req->u.addrinfo.q4.qname.c); - else - LogMsgNoIdent("%s Unrecognized operation %p", prefix, req->terminate); - } - -mDNSlocal char *RecordTypeName(mDNSu8 rtype) - { - switch (rtype) - { - case kDNSRecordTypeUnregistered: return ("Unregistered "); - case kDNSRecordTypeDeregistering: return ("Deregistering"); - case kDNSRecordTypeUnique: return ("Unique "); - case kDNSRecordTypeAdvisory: return ("Advisory "); - case kDNSRecordTypeShared: return ("Shared "); - case kDNSRecordTypeVerified: return ("Verified "); - case kDNSRecordTypeKnownUnique: return ("KnownUnique "); - default: return("Unknown"); - } - } - -mDNSlocal void LogEtcHosts(mDNS *const m) - { - mDNSBool showheader = mDNStrue; - const AuthRecord *ar; - mDNSu32 slot; - AuthGroup *ag; - int count = 0; - int authslot = 0; - mDNSBool truncated = 0; - - for (slot = 0; slot < AUTH_HASH_SLOTS; slot++) - { - if (m->rrauth.rrauth_hash[slot]) authslot++; - for (ag = m->rrauth.rrauth_hash[slot]; ag; ag = ag->next) - for (ar = ag->members; ar; ar = ar->next) - { - if (ar->RecordCallback != FreeEtcHosts) continue; - if (showheader) { showheader = mDNSfalse; LogMsgNoIdent(" State Interface"); } - - // Print a maximum of 50 records - if (count++ >= 50) { truncated = mDNStrue; continue; } - if (ar->ARType == AuthRecordLocalOnly) - { - if (ar->resrec.InterfaceID == mDNSInterface_LocalOnly) - LogMsgNoIdent(" %s LO %s", RecordTypeName(ar->resrec.RecordType), ARDisplayString(m, ar)); - else - { - mDNSu32 scopeid = (mDNSu32)(uintptr_t)ar->resrec.InterfaceID; - LogMsgNoIdent(" %s %u %s", RecordTypeName(ar->resrec.RecordType), scopeid, ARDisplayString(m, ar)); - } - } - usleep((m->KnownBugs & mDNS_KnownBug_LossySyslog) ? 3333 : 1000); - } - } - - if (showheader) LogMsgNoIdent(""); - else if (truncated) LogMsgNoIdent("", count, m->rrauth.rrauth_totalused, authslot); - } - -mDNSlocal void LogLocalOnlyAuthRecords(mDNS *const m) - { - mDNSBool showheader = mDNStrue; - const AuthRecord *ar; - mDNSu32 slot; - AuthGroup *ag; - - for (slot = 0; slot < AUTH_HASH_SLOTS; slot++) - { - for (ag = m->rrauth.rrauth_hash[slot]; ag; ag = ag->next) - for (ar = ag->members; ar; ar = ar->next) - { - if (ar->RecordCallback == FreeEtcHosts) continue; - if (showheader) { showheader = mDNSfalse; LogMsgNoIdent(" State Interface"); } - - // Print a maximum of 400 records - if (ar->ARType == AuthRecordLocalOnly) - LogMsgNoIdent(" %s LO %s", RecordTypeName(ar->resrec.RecordType), ARDisplayString(m, ar)); - else if (ar->ARType == AuthRecordP2P) - LogMsgNoIdent(" %s PP %s", RecordTypeName(ar->resrec.RecordType), ARDisplayString(m, ar)); - usleep((m->KnownBugs & mDNS_KnownBug_LossySyslog) ? 3333 : 1000); - } - } - - if (showheader) LogMsgNoIdent(""); - } - -mDNSlocal void LogAuthRecords(mDNS *const m, const mDNSs32 now, AuthRecord *ResourceRecords, int *proxy) - { - mDNSBool showheader = mDNStrue; - const AuthRecord *ar; - OwnerOptData owner = zeroOwner; - for (ar = ResourceRecords; ar; ar=ar->next) - { - const char *const ifname = InterfaceNameForID(m, ar->resrec.InterfaceID); - if ((ar->WakeUp.HMAC.l[0] != 0) == (proxy != mDNSNULL)) - { - if (showheader) { showheader = mDNSfalse; LogMsgNoIdent(" Int Next Expire State"); } - if (proxy) (*proxy)++; - if (!mDNSPlatformMemSame(&owner, &ar->WakeUp, sizeof(owner))) - { - owner = ar->WakeUp; - if (owner.password.l[0]) - LogMsgNoIdent("Proxying for H-MAC %.6a I-MAC %.6a Password %.6a seq %d", &owner.HMAC, &owner.IMAC, &owner.password, owner.seq); - else if (!mDNSSameEthAddress(&owner.HMAC, &owner.IMAC)) - LogMsgNoIdent("Proxying for H-MAC %.6a I-MAC %.6a seq %d", &owner.HMAC, &owner.IMAC, owner.seq); - else - LogMsgNoIdent("Proxying for %.6a seq %d", &owner.HMAC, owner.seq); - } - if (AuthRecord_uDNS(ar)) - LogMsgNoIdent("%7d %7d %7d %7d %s", - ar->ThisAPInterval / mDNSPlatformOneSecond, - (ar->LastAPTime + ar->ThisAPInterval - now) / mDNSPlatformOneSecond, - ar->expire ? (ar->expire - now) / mDNSPlatformOneSecond : 0, - ar->state, ARDisplayString(m, ar)); - else if (ar->ARType == AuthRecordLocalOnly) - LogMsgNoIdent(" LO %s", ARDisplayString(m, ar)); - else if (ar->ARType == AuthRecordP2P) - LogMsgNoIdent(" PP %s", ARDisplayString(m, ar)); - else - LogMsgNoIdent("%7d %7d %7d %7s %s", - ar->ThisAPInterval / mDNSPlatformOneSecond, - ar->AnnounceCount ? (ar->LastAPTime + ar->ThisAPInterval - now) / mDNSPlatformOneSecond : 0, - ar->TimeExpire ? (ar->TimeExpire - now) / mDNSPlatformOneSecond : 0, - ifname ? ifname : "ALL", - ARDisplayString(m, ar)); - usleep((m->KnownBugs & mDNS_KnownBug_LossySyslog) ? 3333 : 1000); - } - } - if (showheader) LogMsgNoIdent(""); - } - -mDNSexport void udsserver_info(mDNS *const m) - { - const mDNSs32 now = mDNS_TimeNow(m); - mDNSu32 CacheUsed = 0, CacheActive = 0, slot; - int ProxyA = 0, ProxyD = 0; - const CacheGroup *cg; - const CacheRecord *cr; - const DNSQuestion *q; - const DNameListElem *d; - const SearchListElem *s; - - LogMsgNoIdent("Timenow 0x%08lX (%d)", (mDNSu32)now, now); - - LogMsgNoIdent("------------ Cache -------------"); - LogMsgNoIdent("Slt Q TTL if U Type rdlen"); - for (slot = 0; slot < CACHE_HASH_SLOTS; slot++) - for (cg = m->rrcache_hash[slot]; cg; cg=cg->next) - { - CacheUsed++; // Count one cache entity for the CacheGroup object - for (cr = cg->members; cr; cr=cr->next) - { - const mDNSs32 remain = cr->resrec.rroriginalttl - (now - cr->TimeRcvd) / mDNSPlatformOneSecond; - const char *ifname; - mDNSInterfaceID InterfaceID = cr->resrec.InterfaceID; - if (!InterfaceID && cr->resrec.rDNSServer) - InterfaceID = cr->resrec.rDNSServer->interface; - ifname = InterfaceNameForID(m, InterfaceID); - CacheUsed++; - if (cr->CRActiveQuestion) CacheActive++; - LogMsgNoIdent("%3d %s%8ld %-7s%s %-6s%s", - slot, - cr->CRActiveQuestion ? "*" : " ", - remain, - ifname ? ifname : "-U-", - (cr->resrec.RecordType == kDNSRecordTypePacketNegative) ? "-" : - (cr->resrec.RecordType & kDNSRecordTypePacketUniqueMask) ? " " : "+", - DNSTypeName(cr->resrec.rrtype), - CRDisplayString(m, cr)); - usleep((m->KnownBugs & mDNS_KnownBug_LossySyslog) ? 3333 : 1000); - } - } - - if (m->rrcache_totalused != CacheUsed) - LogMsgNoIdent("Cache use mismatch: rrcache_totalused is %lu, true count %lu", m->rrcache_totalused, CacheUsed); - if (m->rrcache_active != CacheActive) - LogMsgNoIdent("Cache use mismatch: rrcache_active is %lu, true count %lu", m->rrcache_active, CacheActive); - LogMsgNoIdent("Cache currently contains %lu entities; %lu referenced by active questions", CacheUsed, CacheActive); - - LogMsgNoIdent("--------- Auth Records ---------"); - LogAuthRecords(m, now, m->ResourceRecords, mDNSNULL); - - LogMsgNoIdent("--------- LocalOnly, P2P Auth Records ---------"); - LogLocalOnlyAuthRecords(m); - - LogMsgNoIdent("--------- /etc/hosts ---------"); - LogEtcHosts(m); - - LogMsgNoIdent("------ Duplicate Records -------"); - LogAuthRecords(m, now, m->DuplicateRecords, mDNSNULL); - - LogMsgNoIdent("----- Auth Records Proxied -----"); - LogAuthRecords(m, now, m->ResourceRecords, &ProxyA); - - LogMsgNoIdent("-- Duplicate Records Proxied ---"); - LogAuthRecords(m, now, m->DuplicateRecords, &ProxyD); - - LogMsgNoIdent("---------- Questions -----------"); - if (!m->Questions) LogMsgNoIdent(""); - else - { - CacheUsed = 0; - CacheActive = 0; - LogMsgNoIdent(" Int Next if T NumAns VDNS Qptr DupOf SU SQ Type Name"); - for (q = m->Questions; q; q=q->next) - { - mDNSs32 i = q->ThisQInterval / mDNSPlatformOneSecond; - mDNSs32 n = (NextQSendTime(q) - now) / mDNSPlatformOneSecond; - char *ifname = InterfaceNameForID(m, q->InterfaceID); - CacheUsed++; - if (q->ThisQInterval) CacheActive++; - LogMsgNoIdent("%6d%6d %-7s%s%s %5d 0x%x%x 0x%p 0x%p %1d %2d %-5s%##s%s", - i, n, - ifname ? ifname : mDNSOpaque16IsZero(q->TargetQID) ? "" : "-U-", - mDNSOpaque16IsZero(q->TargetQID) ? (q->LongLived ? "l" : " ") : (q->LongLived ? "L" : "O"), - PrivateQuery(q) ? "P" : " ", - q->CurrentAnswers, q->validDNSServers.l[1], q->validDNSServers.l[0], q, q->DuplicateOf, - q->SuppressUnusable, q->SuppressQuery, DNSTypeName(q->qtype), q->qname.c, q->DuplicateOf ? " (dup)" : ""); - usleep((m->KnownBugs & mDNS_KnownBug_LossySyslog) ? 3333 : 1000); - } - LogMsgNoIdent("%lu question%s; %lu active", CacheUsed, CacheUsed > 1 ? "s" : "", CacheActive); - } - - LogMsgNoIdent("----- Local-Only Questions -----"); - if (!m->LocalOnlyQuestions) LogMsgNoIdent(""); - else for (q = m->LocalOnlyQuestions; q; q=q->next) - LogMsgNoIdent(" %5d %-6s%##s%s", - q->CurrentAnswers, DNSTypeName(q->qtype), q->qname.c, q->DuplicateOf ? " (dup)" : ""); - - LogMsgNoIdent("---- Active Client Requests ----"); - if (!all_requests) LogMsgNoIdent(""); - else - { - const request_state *req, *r; - for (req = all_requests; req; req=req->next) - { - if (req->primary) // If this is a subbordinate operation, check that the parent is in the list - { - for (r = all_requests; r && r != req; r=r->next) if (r == req->primary) goto foundparent; - LogMsgNoIdent("%3d: Orhpan operation %p; parent %p not found in request list", req->sd); - } - // For non-subbordinate operations, and subbordinate operations that have lost their parent, write out their info - LogClientInfo(m, req); - foundparent:; - } - } - - LogMsgNoIdent("-------- NAT Traversals --------"); - if (!m->NATTraversals) LogMsgNoIdent(""); - else - { - const NATTraversalInfo *nat; - for (nat = m->NATTraversals; nat; nat=nat->next) - { - if (nat->Protocol) - LogMsgNoIdent("%p %s Int %5d Ext %5d Err %d Retry %5d Interval %5d Expire %5d", - nat, nat->Protocol == NATOp_MapTCP ? "TCP" : "UDP", - mDNSVal16(nat->IntPort), mDNSVal16(nat->ExternalPort), nat->Result, - nat->retryPortMap ? (nat->retryPortMap - now) / mDNSPlatformOneSecond : 0, - nat->retryInterval / mDNSPlatformOneSecond, - nat->ExpiryTime ? (nat->ExpiryTime - now) / mDNSPlatformOneSecond : 0); - else - LogMsgNoIdent("%p Address Request Retry %5d Interval %5d", nat, - (m->retryGetAddr - now) / mDNSPlatformOneSecond, - m->retryIntervalGetAddr / mDNSPlatformOneSecond); - usleep((m->KnownBugs & mDNS_KnownBug_LossySyslog) ? 3333 : 1000); - } - } - - LogMsgNoIdent("--------- AuthInfoList ---------"); - if (!m->AuthInfoList) LogMsgNoIdent(""); - else - { - const DomainAuthInfo *a; - for (a = m->AuthInfoList; a; a = a->next) - LogMsgNoIdent("%##s %##s %##s %d %s", a->domain.c, a->keyname.c, a->hostname.c, (a->port.b[0] << 8 | a->port.b[1]), a->AutoTunnel ? a->AutoTunnel : ""); - } - - #if APPLE_OSX_mDNSResponder - LogMsgNoIdent("--------- TunnelClients --------"); - if (!m->TunnelClients) LogMsgNoIdent(""); - else - { - const ClientTunnel *c; - for (c = m->TunnelClients; c; c = c->next) - LogMsgNoIdent("%s %##s local %.16a %.4a %.16a remote %.16a %.4a %5d %.16a interval %d", - c->prefix, c->dstname.c, &c->loc_inner, &c->loc_outer, &c->loc_outer6, &c->rmt_inner, &c->rmt_outer, mDNSVal16(c->rmt_outer_port), &c->rmt_outer6, c->q.ThisQInterval); - } - #endif // APPLE_OSX_mDNSResponder - - LogMsgNoIdent("---------- Misc State ----------"); - - LogMsgNoIdent("PrimaryMAC: %.6a", &m->PrimaryMAC); - - LogMsgNoIdent("m->SleepState %d (%s) seq %d", - m->SleepState, - m->SleepState == SleepState_Awake ? "Awake" : - m->SleepState == SleepState_Transferring ? "Transferring" : - m->SleepState == SleepState_Sleeping ? "Sleeping" : "?", - m->SleepSeqNum); - - if (!m->SPSSocket) LogMsgNoIdent("Not offering Sleep Proxy Service"); - else LogMsgNoIdent("Offering Sleep Proxy Service: %#s", m->SPSRecords.RR_SRV.resrec.name->c); - - if (m->ProxyRecords == ProxyA + ProxyD) LogMsgNoIdent("ProxyRecords: %d + %d = %d", ProxyA, ProxyD, ProxyA + ProxyD); - else LogMsgNoIdent("ProxyRecords: MISMATCH %d + %d = %d != %d", ProxyA, ProxyD, ProxyA + ProxyD, m->ProxyRecords); - - LogMsgNoIdent("------ Auto Browse Domains -----"); - if (!AutoBrowseDomains) LogMsgNoIdent(""); - else for (d=AutoBrowseDomains; d; d=d->next) LogMsgNoIdent("%##s", d->name.c); - - LogMsgNoIdent("--- Auto Registration Domains --"); - if (!AutoRegistrationDomains) LogMsgNoIdent(""); - else for (d=AutoRegistrationDomains; d; d=d->next) LogMsgNoIdent("%##s", d->name.c); - - LogMsgNoIdent("--- Search Domains --"); - if (!SearchList) LogMsgNoIdent(""); - else - { - for (s=SearchList; s; s=s->next) - { - char *ifname = InterfaceNameForID(m, s->InterfaceID); - LogMsgNoIdent("%##s %s", s->domain.c, ifname ? ifname : ""); - } - } - - LogMsgNoIdent("---- Task Scheduling Timers ----"); - - if (!m->NewQuestions) - LogMsgNoIdent("NewQuestion "); - else - LogMsgNoIdent("NewQuestion DelayAnswering %d %d %##s (%s)", - m->NewQuestions->DelayAnswering, m->NewQuestions->DelayAnswering-now, - m->NewQuestions->qname.c, DNSTypeName(m->NewQuestions->qtype)); - - if (!m->NewLocalOnlyQuestions) - LogMsgNoIdent("NewLocalOnlyQuestions "); - else - LogMsgNoIdent("NewLocalOnlyQuestions %##s (%s)", - m->NewLocalOnlyQuestions->qname.c, DNSTypeName(m->NewLocalOnlyQuestions->qtype)); - - if (!m->NewLocalRecords) - LogMsgNoIdent("NewLocalRecords "); - else - LogMsgNoIdent("NewLocalRecords %02X %s", m->NewLocalRecords->resrec.RecordType, ARDisplayString(m, m->NewLocalRecords)); - - LogMsgNoIdent("SPSProxyListChanged%s", m->SPSProxyListChanged ? "" : " "); - LogMsgNoIdent("LocalRemoveEvents%s", m->LocalRemoveEvents ? "" : " "); - LogMsgNoIdent("m->RegisterAutoTunnel6 %08X", m->RegisterAutoTunnel6); - LogMsgNoIdent("m->AutoTunnelRelayAddrIn %.16a", &m->AutoTunnelRelayAddrIn); - LogMsgNoIdent("m->AutoTunnelRelayAddrOut %.16a", &m->AutoTunnelRelayAddrOut); - -#define LogTimer(MSG,T) LogMsgNoIdent( MSG " %08X %11d %08X %11d", (T), (T), (T)-now, (T)-now) - - LogMsgNoIdent(" ABS (hex) ABS (dec) REL (hex) REL (dec)"); - LogMsgNoIdent("m->timenow %08X %11d", now, now); - LogMsgNoIdent("m->timenow_adjust %08X %11d", m->timenow_adjust, m->timenow_adjust); - LogTimer("m->NextScheduledEvent ", m->NextScheduledEvent); - -#ifndef UNICAST_DISABLED - LogTimer("m->NextuDNSEvent ", m->NextuDNSEvent); - LogTimer("m->NextSRVUpdate ", m->NextSRVUpdate); - LogTimer("m->NextScheduledNATOp ", m->NextScheduledNATOp); - LogTimer("m->retryGetAddr ", m->retryGetAddr); -#endif - - LogTimer("m->NextCacheCheck ", m->NextCacheCheck); - LogTimer("m->NextScheduledSPS ", m->NextScheduledSPS); - LogTimer("m->NextScheduledSPRetry ", m->NextScheduledSPRetry); - LogTimer("m->DelaySleep ", m->DelaySleep); - - LogTimer("m->NextScheduledQuery ", m->NextScheduledQuery); - LogTimer("m->NextScheduledProbe ", m->NextScheduledProbe); - LogTimer("m->NextScheduledResponse", m->NextScheduledResponse); - - LogTimer("m->SuppressSending ", m->SuppressSending); - LogTimer("m->SuppressProbes ", m->SuppressProbes); - LogTimer("m->ProbeFailTime ", m->ProbeFailTime); - LogTimer("m->DelaySleep ", m->DelaySleep); - LogTimer("m->SleepLimit ", m->SleepLimit); - LogTimer("m->NextScheduledStopTime ", m->NextScheduledStopTime); - } - -#if APPLE_OSX_mDNSResponder && MACOSX_MDNS_MALLOC_DEBUGGING -mDNSexport void uds_validatelists(void) - { - const request_state *req, *p; - for (req = all_requests; req; req=req->next) - { - if (req->next == (request_state *)~0 || (req->sd < 0 && req->sd != -2)) - LogMemCorruption("UDS request list: %p is garbage (%d)", req, req->sd); - - if (req->primary == req) - LogMemCorruption("UDS request list: req->primary should not point to self %p/%d", req, req->sd); - - if (req->primary && req->replies) - LogMemCorruption("UDS request list: Subordinate request %p/%d/%p should not have replies (%p)", - req, req->sd, req->primary && req->replies); - - p = req->primary; - if ((long)p & 3) - LogMemCorruption("UDS request list: req %p primary %p is misaligned (%d)", req, p, req->sd); - else if (p && (p->next == (request_state *)~0 || (p->sd < 0 && p->sd != -2))) - LogMemCorruption("UDS request list: req %p primary %p is garbage (%d)", req, p, p->sd); - - reply_state *rep; - for (rep = req->replies; rep; rep=rep->next) - if (rep->next == (reply_state *)~0) - LogMemCorruption("UDS req->replies: %p is garbage", rep); - - if (req->terminate == connection_termination) - { - registered_record_entry *r; - for (r = req->u.reg_recs; r; r=r->next) - if (r->next == (registered_record_entry *)~0) - LogMemCorruption("UDS req->u.reg_recs: %p is garbage", r); - } - else if (req->terminate == regservice_termination_callback) - { - service_instance *s; - for (s = req->u.servicereg.instances; s; s=s->next) - if (s->next == (service_instance *)~0) - LogMemCorruption("UDS req->u.servicereg.instances: %p is garbage", s); - } - else if (req->terminate == browse_termination_callback) - { - browser_t *b; - for (b = req->u.browser.browsers; b; b=b->next) - if (b->next == (browser_t *)~0) - LogMemCorruption("UDS req->u.browser.browsers: %p is garbage", b); - } - } - - DNameListElem *d; - for (d = SCPrefBrowseDomains; d; d=d->next) - if (d->next == (DNameListElem *)~0 || d->name.c[0] > 63) - LogMemCorruption("SCPrefBrowseDomains: %p is garbage (%d)", d, d->name.c[0]); - - ARListElem *b; - for (b = LocalDomainEnumRecords; b; b=b->next) - if (b->next == (ARListElem *)~0 || b->ar.resrec.name->c[0] > 63) - LogMemCorruption("LocalDomainEnumRecords: %p is garbage (%d)", b, b->ar.resrec.name->c[0]); - - for (d = AutoBrowseDomains; d; d=d->next) - if (d->next == (DNameListElem *)~0 || d->name.c[0] > 63) - LogMemCorruption("AutoBrowseDomains: %p is garbage (%d)", d, d->name.c[0]); - - for (d = AutoRegistrationDomains; d; d=d->next) - if (d->next == (DNameListElem *)~0 || d->name.c[0] > 63) - LogMemCorruption("AutoRegistrationDomains: %p is garbage (%d)", d, d->name.c[0]); - } -#endif // APPLE_OSX_mDNSResponder && MACOSX_MDNS_MALLOC_DEBUGGING - -mDNSlocal int send_msg(request_state *const req) - { - reply_state *const rep = req->replies; // Send the first waiting reply - ssize_t nwriten; - if (req->no_reply) return(t_complete); - - ConvertHeaderBytes(rep->mhdr); - nwriten = send(req->sd, (char *)&rep->mhdr + rep->nwriten, rep->totallen - rep->nwriten, 0); - ConvertHeaderBytes(rep->mhdr); - - if (nwriten < 0) - { - if (dnssd_errno == dnssd_EINTR || dnssd_errno == dnssd_EWOULDBLOCK) nwriten = 0; - else - { -#if !defined(PLATFORM_NO_EPIPE) - if (dnssd_errno == EPIPE) - return(req->ts = t_terminated); - else -#endif - { - LogMsg("send_msg ERROR: failed to write %d of %d bytes to fd %d errno %d (%s)", - rep->totallen - rep->nwriten, rep->totallen, req->sd, dnssd_errno, dnssd_strerror(dnssd_errno)); - return(t_error); - } - } - } - rep->nwriten += nwriten; - return (rep->nwriten == rep->totallen) ? t_complete : t_morecoming; - } - -mDNSexport mDNSs32 udsserver_idle(mDNSs32 nextevent) - { - mDNSs32 now = mDNS_TimeNow(&mDNSStorage); - request_state **req = &all_requests; - - while (*req) - { - request_state *const r = *req; - - if (r->terminate == resolve_termination_callback) - if (r->u.resolve.ReportTime && now - r->u.resolve.ReportTime >= 0) - { - r->u.resolve.ReportTime = 0; - LogMsgNoIdent("Client application bug: DNSServiceResolve(%##s) active for over two minutes. " - "This places considerable burden on the network.", r->u.resolve.qsrv.qname.c); - } - - // Note: Only primary req's have reply lists, not subordinate req's. - while (r->replies) // Send queued replies - { - transfer_state result; - if (r->replies->next) r->replies->rhdr->flags |= dnssd_htonl(kDNSServiceFlagsMoreComing); - result = send_msg(r); // Returns t_morecoming if buffer full because client is not reading - if (result == t_complete) - { - reply_state *fptr = r->replies; - r->replies = r->replies->next; - freeL("reply_state/udsserver_idle", fptr); - r->time_blocked = 0; // reset failure counter after successful send - r->unresponsiveness_reports = 0; - continue; - } - else if (result == t_terminated || result == t_error) - { - LogMsg("%3d: Could not write data to client because of error - aborting connection", r->sd); - LogClientInfo(&mDNSStorage, r); - abort_request(r); - } - break; - } - - if (r->replies) // If we failed to send everything, check our time_blocked timer - { - if (nextevent - now > mDNSPlatformOneSecond) nextevent = now + mDNSPlatformOneSecond; - - if (mDNSStorage.SleepState != SleepState_Awake) r->time_blocked = 0; - else if (!r->time_blocked) r->time_blocked = NonZeroTime(now); - else if (now - r->time_blocked >= 10 * mDNSPlatformOneSecond * (r->unresponsiveness_reports+1)) - { - int num = 0; - struct reply_state *x = r->replies; - while (x) { num++; x=x->next; } - LogMsg("%3d: Could not write data to client after %ld seconds, %d repl%s waiting", - r->sd, (now - r->time_blocked) / mDNSPlatformOneSecond, num, num == 1 ? "y" : "ies"); - if (++r->unresponsiveness_reports >= 60) - { - LogMsg("%3d: Client unresponsive; aborting connection", r->sd); - LogClientInfo(&mDNSStorage, r); - abort_request(r); - } - } - } - - if (!dnssd_SocketValid(r->sd)) // If this request is finished, unlink it from the list and free the memory - { - // Since we're already doing a list traversal, we unlink the request directly instead of using AbortUnlinkAndFree() - *req = r->next; - freeL("request_state/udsserver_idle", r); - } - else - req = &r->next; - } - return nextevent; - } - -struct CompileTimeAssertionChecks_uds_daemon - { - // Check our structures are reasonable sizes. Including overly-large buffers, or embedding - // other overly-large structures instead of having a pointer to them, can inadvertently - // cause structure sizes (and therefore memory usage) to balloon unreasonably. - char sizecheck_request_state [(sizeof(request_state) <= 1784) ? 1 : -1]; - char sizecheck_registered_record_entry[(sizeof(registered_record_entry) <= 60) ? 1 : -1]; - char sizecheck_service_instance [(sizeof(service_instance) <= 6552) ? 1 : -1]; - char sizecheck_browser_t [(sizeof(browser_t) <= 1050) ? 1 : -1]; - char sizecheck_reply_hdr [(sizeof(reply_hdr) <= 12) ? 1 : -1]; - char sizecheck_reply_state [(sizeof(reply_state) <= 64) ? 1 : -1]; - }; diff --git a/src/tools/mdnssd/uds_daemon.h b/src/tools/mdnssd/uds_daemon.h deleted file mode 100644 index 1e17efa105..0000000000 --- a/src/tools/mdnssd/uds_daemon.h +++ /dev/null @@ -1,80 +0,0 @@ -/* -*- Mode: C; tab-width: 4 -*- - * - * Copyright (c) 2002-2003 Apple Computer, Inc. All rights reserved. - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - - File: uds_daemon.h - - Contains: Interfaces necessary to talk to uds_daemon.c. - - Version: 1.0 - - */ - -#include "mDNSEmbeddedAPI.h" -#include "dnssd_ipc.h" - -/* Client interface: */ - -#define SRS_PORT(S) mDNSVal16((S)->RR_SRV.resrec.rdata->u.srv.port) - -extern int udsserver_init(dnssd_sock_t skts[], mDNSu32 count); -extern mDNSs32 udsserver_idle(mDNSs32 nextevent); -extern void udsserver_info(mDNS *const m); // print out info about current state -extern void udsserver_handle_configchange(mDNS *const m); -extern int udsserver_exit(void); // should be called prior to app exit - -/* Routines that uds_daemon expects to link against: */ - -typedef void (*udsEventCallback)(int fd, short filter, void *context); -extern mStatus udsSupportAddFDToEventLoop(dnssd_sock_t fd, udsEventCallback callback, void *context, void **platform_data); -extern int udsSupportReadFD(dnssd_sock_t fd, char* buf, int len, int flags, void *platform_data); -extern mStatus udsSupportRemoveFDFromEventLoop(dnssd_sock_t fd, void *platform_data); // Note: This also CLOSES the file descriptor as well - -extern void RecordUpdatedNiceLabel(mDNS *const m, mDNSs32 delay); - -// Globals and functions defined in uds_daemon.c and also shared with the old "daemon.c" on OS X - -extern mDNS mDNSStorage; -extern DNameListElem *AutoRegistrationDomains; -extern DNameListElem *AutoBrowseDomains; - -extern mDNSs32 ChopSubTypes(char *regtype); -extern AuthRecord *AllocateSubTypes(mDNSs32 NumSubTypes, char *p); -extern int CountExistingRegistrations(domainname *srv, mDNSIPPort port); -extern void FreeExtraRR(mDNS *const m, AuthRecord *const rr, mStatus result); -extern int CountPeerRegistrations(mDNS *const m, ServiceRecordSet *const srs); - -#if APPLE_OSX_mDNSResponder -extern void machserver_automatic_browse_domain_changed(const domainname *d, mDNSBool add); -extern void machserver_automatic_registration_domain_changed(const domainname *d, mDNSBool add); -// External support -extern void mDNSInitPacketFilter(void); -extern void external_start_browsing_for_service(mDNS *const m, const domainname *const type, DNS_TypeValues qtype); -extern void external_stop_browsing_for_service(mDNS *const m, const domainname *const type, DNS_TypeValues qtype); -extern void external_start_advertising_service(const ResourceRecord *const resourceRecord); -extern void external_stop_advertising_service(const ResourceRecord *const resourceRecord); -extern void external_start_resolving_service(const domainname *const fqdn); -extern void external_stop_resolving_service(const domainname *const fqdn); -#else -#define external_start_browsing_for_service(A,B,C) (void)(A) -#define external_stop_browsing_for_service(A,B,C) (void)(A) -#define external_start_advertising_service(A) (void)(A) -#define external_stop_advertising_service(A) (void)(A) -#define external_start_resolving_service(A) (void)(A) -#define external_stop_resolving_service(A) (void)(A) -#endif // APPLE_OSX_mDNSResponder - -extern const char mDNSResponderVersionString_SCCS[]; -#define mDNSResponderVersionString (mDNSResponderVersionString_SCCS+5) diff --git a/src/tools/tools.pro b/src/tools/tools.pro index bd5bac6c8f..0ee0f87ebf 100644 --- a/src/tools/tools.pro +++ b/src/tools/tools.pro @@ -18,10 +18,6 @@ win32 { SUBDIRS += valgrindfake } -linux-* { - SUBDIRS += mdnssd -} - QT_BREAKPAD_ROOT_PATH = $$(QT_BREAKPAD_ROOT_PATH) !isEmpty(QT_BREAKPAD_ROOT_PATH) { SUBDIRS += qtcrashhandler -- cgit v1.2.1