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/*
Unix SMB/CIFS implementation.
DNS server utils
Copyright (C) 2010 Kai Blin <kai@samba.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "libcli/util/ntstatus.h"
#include "libcli/util/werror.h"
#include "librpc/ndr/libndr.h"
#include "librpc/gen_ndr/ndr_dns.h"
#include "librpc/gen_ndr/ndr_dnsp.h"
#include <ldb.h>
#include "dsdb/samdb/samdb.h"
#include "dsdb/common/util.h"
#include "dns_server/dns_server.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_DNS
/* Names are equal if they match and there's nothing left over */
bool dns_name_equal(const char *name1, const char *name2)
{
size_t host_part_len;
bool ret = dns_name_match(name1, name2, &host_part_len);
return ret && (host_part_len == 0);
}
/*
see if two dns records match
*/
bool dns_records_match(struct dnsp_DnssrvRpcRecord *rec1,
struct dnsp_DnssrvRpcRecord *rec2)
{
bool status;
int i;
if (rec1->wType != rec2->wType) {
return false;
}
/* see if the data matches */
switch (rec1->wType) {
case DNS_TYPE_A:
return strcmp(rec1->data.ipv4, rec2->data.ipv4) == 0;
case DNS_TYPE_AAAA:
return strcmp(rec1->data.ipv6, rec2->data.ipv6) == 0;
case DNS_TYPE_CNAME:
return dns_name_equal(rec1->data.cname, rec2->data.cname);
case DNS_TYPE_TXT:
if (rec1->data.txt.count != rec2->data.txt.count) {
return false;
}
status = true;
for (i=0; i<rec1->data.txt.count; i++) {
status = status && (strcmp(rec1->data.txt.str[i],
rec2->data.txt.str[i]) == 0);
}
return status;
case DNS_TYPE_PTR:
return strcmp(rec1->data.ptr, rec2->data.ptr) == 0;
case DNS_TYPE_NS:
return dns_name_equal(rec1->data.ns, rec2->data.ns);
case DNS_TYPE_SRV:
return rec1->data.srv.wPriority == rec2->data.srv.wPriority &&
rec1->data.srv.wWeight == rec2->data.srv.wWeight &&
rec1->data.srv.wPort == rec2->data.srv.wPort &&
dns_name_equal(rec1->data.srv.nameTarget, rec2->data.srv.nameTarget);
case DNS_TYPE_MX:
return rec1->data.mx.wPriority == rec2->data.mx.wPriority &&
dns_name_equal(rec1->data.mx.nameTarget, rec2->data.mx.nameTarget);
case DNS_TYPE_HINFO:
return strcmp(rec1->data.hinfo.cpu, rec2->data.hinfo.cpu) == 0 &&
strcmp(rec1->data.hinfo.os, rec2->data.hinfo.os) == 0;
case DNS_TYPE_SOA:
return dns_name_equal(rec1->data.soa.mname, rec2->data.soa.mname) &&
dns_name_equal(rec1->data.soa.rname, rec2->data.soa.rname) &&
rec1->data.soa.serial == rec2->data.soa.serial &&
rec1->data.soa.refresh == rec2->data.soa.refresh &&
rec1->data.soa.retry == rec2->data.soa.retry &&
rec1->data.soa.expire == rec2->data.soa.expire &&
rec1->data.soa.minimum == rec2->data.soa.minimum;
default:
break;
}
return false;
}
/*
* Lookup a DNS record, performing an exact match.
* i.e. DNS wild card records are not considered.
*/
WERROR dns_lookup_records(struct dns_server *dns,
TALLOC_CTX *mem_ctx,
struct ldb_dn *dn,
struct dnsp_DnssrvRpcRecord **records,
uint16_t *rec_count)
{
return dns_common_lookup(dns->samdb, mem_ctx, dn,
records, rec_count, NULL);
}
/*
* Lookup a DNS record, will match DNS wild card records if an exact match
* is not found.
*/
WERROR dns_lookup_records_wildcard(struct dns_server *dns,
TALLOC_CTX *mem_ctx,
struct ldb_dn *dn,
struct dnsp_DnssrvRpcRecord **records,
uint16_t *rec_count)
{
return dns_common_wildcard_lookup(dns->samdb, mem_ctx, dn,
records, rec_count);
}
WERROR dns_replace_records(struct dns_server *dns,
TALLOC_CTX *mem_ctx,
struct ldb_dn *dn,
bool needs_add,
struct dnsp_DnssrvRpcRecord *records,
uint16_t rec_count)
{
/* TODO: Autogenerate this somehow */
uint32_t dwSerial = 110;
return dns_common_replace(dns->samdb, mem_ctx, dn,
needs_add, dwSerial, records, rec_count);
}
bool dns_authoritative_for_zone(struct dns_server *dns,
const char *name)
{
const struct dns_server_zone *z;
size_t host_part_len = 0;
if (name == NULL) {
return false;
}
if (strcmp(name, "") == 0) {
return true;
}
for (z = dns->zones; z != NULL; z = z->next) {
bool match;
match = dns_name_match(z->name, name, &host_part_len);
if (match) {
break;
}
}
if (z == NULL) {
return false;
}
return true;
}
const char *dns_get_authoritative_zone(struct dns_server *dns,
const char *name)
{
const struct dns_server_zone *z;
size_t host_part_len = 0;
for (z = dns->zones; z != NULL; z = z->next) {
bool match;
match = dns_name_match(z->name, name, &host_part_len);
if (match) {
return z->name;
}
}
return NULL;
}
WERROR dns_name2dn(struct dns_server *dns,
TALLOC_CTX *mem_ctx,
const char *name,
struct ldb_dn **dn)
{
return dns_common_name2dn(dns->samdb, dns->zones,
mem_ctx, name, dn);
}
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