diff options
Diffstat (limited to 'REORG.TODO/nis/nss_nis/nis-hosts.c')
| -rw-r--r-- | REORG.TODO/nis/nss_nis/nis-hosts.c | 567 |
1 files changed, 567 insertions, 0 deletions
diff --git a/REORG.TODO/nis/nss_nis/nis-hosts.c b/REORG.TODO/nis/nss_nis/nis-hosts.c new file mode 100644 index 0000000000..f64dbdaecb --- /dev/null +++ b/REORG.TODO/nis/nss_nis/nis-hosts.c @@ -0,0 +1,567 @@ +/* Copyright (C) 1996-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Thorsten Kukuk <kukuk@suse.de>, 1996. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <assert.h> +#include <nss.h> +#include <ctype.h> +/* The following is an ugly trick to avoid a prototype declaration for + _nss_nis_endgrent. */ +#define _nss_nis_endhostent _nss_nis_endhostent_XXX +#include <netdb.h> +#undef _nss_nis_endhostent +#include <string.h> +#include <netinet/in.h> +#include <arpa/inet.h> +#include <resolv/resolv-internal.h> +#include <libc-lock.h> +#include <rpcsvc/yp.h> +#include <rpcsvc/ypclnt.h> + +#include "nss-nis.h" + +/* Get implementation for some internal functions. */ +#include <resolv/mapv4v6addr.h> + +#define ENTNAME hostent +#define DATABASE "hosts" +#define NEED_H_ERRNO + +#define EXTRA_ARGS , af, flags +#define EXTRA_ARGS_DECL , int af, int flags + +#define ENTDATA hostent_data +struct hostent_data + { + unsigned char host_addr[16]; /* IPv4 or IPv6 address. */ + char *h_addr_ptrs[2]; /* Points to that and null terminator. */ + }; + +#define TRAILING_LIST_MEMBER h_aliases +#define TRAILING_LIST_SEPARATOR_P isspace +#include <nss/nss_files/files-parse.c> +LINE_PARSER +("#", + { + char *addr; + + STRING_FIELD (addr, isspace, 1); + + assert (af == AF_INET || af == AF_INET6 || af == AF_UNSPEC); + + /* Parse address. */ + if (af != AF_INET6 && inet_pton (AF_INET, addr, entdata->host_addr) > 0) + { + assert ((flags & AI_V4MAPPED) == 0 || af != AF_UNSPEC); + if (flags & AI_V4MAPPED) + { + map_v4v6_address ((char *) entdata->host_addr, + (char *) entdata->host_addr); + result->h_addrtype = AF_INET6; + result->h_length = IN6ADDRSZ; + } + else + { + result->h_addrtype = AF_INET; + result->h_length = INADDRSZ; + } + } + else if (af != AF_INET + && inet_pton (AF_INET6, addr, entdata->host_addr) > 0) + { + result->h_addrtype = AF_INET6; + result->h_length = IN6ADDRSZ; + } + else + /* Illegal address: ignore line. */ + return 0; + + /* Store a pointer to the address in the expected form. */ + entdata->h_addr_ptrs[0] = (char *) entdata->host_addr; + entdata->h_addr_ptrs[1] = NULL; + result->h_addr_list = entdata->h_addr_ptrs; + + STRING_FIELD (result->h_name, isspace, 1); + }) + + +__libc_lock_define_initialized (static, lock) + +static bool_t new_start = 1; +static char *oldkey = NULL; +static int oldkeylen = 0; + + +enum nss_status +_nss_nis_sethostent (int stayopen) +{ + __libc_lock_lock (lock); + + new_start = 1; + if (oldkey != NULL) + { + free (oldkey); + oldkey = NULL; + oldkeylen = 0; + } + + __libc_lock_unlock (lock); + + return NSS_STATUS_SUCCESS; +} +/* Make _nss_nis_endhostent an alias of _nss_nis_sethostent. We do this + even though the prototypes don't match. The argument of sethostent + is used so this makes no difference. */ +strong_alias (_nss_nis_sethostent, _nss_nis_endhostent) + + +/* The calling function always need to get a lock first. */ +static enum nss_status +internal_nis_gethostent_r (struct hostent *host, char *buffer, + size_t buflen, int *errnop, int *h_errnop, + int af, int flags) +{ + char *domain; + if (__glibc_unlikely (yp_get_default_domain (&domain))) + return NSS_STATUS_UNAVAIL; + + uintptr_t pad = -(uintptr_t) buffer % __alignof__ (struct parser_data); + buffer += pad; + + struct parser_data *data = (void *) buffer; + if (__glibc_unlikely (buflen < sizeof *data + 1 + pad)) + { + *errnop = ERANGE; + *h_errnop = NETDB_INTERNAL; + return NSS_STATUS_TRYAGAIN; + } + buflen -= pad; + + /* Get the next entry until we found a correct one. */ + const size_t linebuflen = buffer + buflen - data->linebuffer; + int parse_res; + do + { + char *result; + int len; + char *outkey; + int keylen; + int yperr; + if (new_start) + yperr = yp_first (domain, "hosts.byname", &outkey, &keylen, &result, + &len); + else + yperr = yp_next (domain, "hosts.byname", oldkey, oldkeylen, &outkey, + &keylen, &result, &len); + + if (__glibc_unlikely (yperr != YPERR_SUCCESS)) + { + enum nss_status retval = yperr2nss (yperr); + + switch (retval) + { + case NSS_STATUS_TRYAGAIN: + *errnop = errno; + *h_errnop = TRY_AGAIN; + break; + case NSS_STATUS_NOTFOUND: + *h_errnop = HOST_NOT_FOUND; + break; + default: + *h_errnop = NO_RECOVERY; + break; + } + return retval; + } + + if (__glibc_unlikely ((size_t) (len + 1) > linebuflen)) + { + free (result); + *h_errnop = NETDB_INTERNAL; + *errnop = ERANGE; + return NSS_STATUS_TRYAGAIN; + } + + char *p = strncpy (data->linebuffer, result, len); + data->linebuffer[len] = '\0'; + while (isspace (*p)) + ++p; + free (result); + + parse_res = parse_line (p, host, data, buflen, errnop, af, flags); + if (__glibc_unlikely (parse_res == -1)) + { + free (outkey); + *h_errnop = NETDB_INTERNAL; + *errnop = ERANGE; + return NSS_STATUS_TRYAGAIN; + } + free (oldkey); + oldkey = outkey; + oldkeylen = keylen; + new_start = 0; + } + while (!parse_res); + + *h_errnop = NETDB_SUCCESS; + return NSS_STATUS_SUCCESS; +} + + +enum nss_status +_nss_nis_gethostent_r (struct hostent *host, char *buffer, size_t buflen, + int *errnop, int *h_errnop) +{ + enum nss_status status; + + __libc_lock_lock (lock); + + status = internal_nis_gethostent_r (host, buffer, buflen, errnop, h_errnop, + (res_use_inet6 () ? AF_INET6 : AF_INET), + (res_use_inet6 () ? AI_V4MAPPED : 0 )); + + __libc_lock_unlock (lock); + + return status; +} + + +static enum nss_status +internal_gethostbyname2_r (const char *name, int af, struct hostent *host, + char *buffer, size_t buflen, int *errnop, + int *h_errnop, int flags) +{ + uintptr_t pad = -(uintptr_t) buffer % __alignof__ (struct parser_data); + buffer += pad; + + struct parser_data *data = (void *) buffer; + + if (name == NULL) + { + *errnop = EINVAL; + return NSS_STATUS_UNAVAIL; + } + + char *domain; + if (yp_get_default_domain (&domain)) + return NSS_STATUS_UNAVAIL; + + if (buflen < sizeof *data + 1 + pad) + { + *h_errnop = NETDB_INTERNAL; + *errnop = ERANGE; + return NSS_STATUS_TRYAGAIN; + } + buflen -= pad; + + /* Convert name to lowercase. */ + size_t namlen = strlen (name); + /* Limit name length to the maximum size of an RPC packet. */ + if (namlen > UDPMSGSIZE) + { + *errnop = ERANGE; + return NSS_STATUS_UNAVAIL; + } + + char name2[namlen + 1]; + size_t i; + + for (i = 0; i < namlen; ++i) + name2[i] = tolower (name[i]); + name2[i] = '\0'; + + char *result; + int len; + int yperr = yp_match (domain, "hosts.byname", name2, namlen, &result, &len); + + if (__glibc_unlikely (yperr != YPERR_SUCCESS)) + { + enum nss_status retval = yperr2nss (yperr); + + if (retval == NSS_STATUS_TRYAGAIN) + { + *h_errnop = TRY_AGAIN; + *errnop = errno; + } + if (retval == NSS_STATUS_NOTFOUND) + *h_errnop = HOST_NOT_FOUND; + return retval; + } + + const size_t linebuflen = buffer + buflen - data->linebuffer; + if (__glibc_unlikely ((size_t) (len + 1) > linebuflen)) + { + free (result); + *h_errnop = NETDB_INTERNAL; + *errnop = ERANGE; + return NSS_STATUS_TRYAGAIN; + } + + char *p = strncpy (data->linebuffer, result, len); + data->linebuffer[len] = '\0'; + while (isspace (*p)) + ++p; + free (result); + + int parse_res = parse_line (p, host, data, buflen, errnop, af, flags); + + if (__glibc_unlikely (parse_res < 1 || host->h_addrtype != af)) + { + if (parse_res == -1) + { + *h_errnop = NETDB_INTERNAL; + return NSS_STATUS_TRYAGAIN; + } + else + { + *h_errnop = HOST_NOT_FOUND; + return NSS_STATUS_NOTFOUND; + } + } + + *h_errnop = NETDB_SUCCESS; + return NSS_STATUS_SUCCESS; +} + + +enum nss_status +_nss_nis_gethostbyname2_r (const char *name, int af, struct hostent *host, + char *buffer, size_t buflen, int *errnop, + int *h_errnop) +{ + if (af != AF_INET && af != AF_INET6) + { + *h_errnop = HOST_NOT_FOUND; + return NSS_STATUS_NOTFOUND; + } + + return internal_gethostbyname2_r (name, af, host, buffer, buflen, errnop, + h_errnop, + (res_use_inet6 () ? AI_V4MAPPED : 0)); +} + + +enum nss_status +_nss_nis_gethostbyname_r (const char *name, struct hostent *host, char *buffer, + size_t buflen, int *errnop, int *h_errnop) +{ + if (res_use_inet6 ()) + { + enum nss_status status; + + status = internal_gethostbyname2_r (name, AF_INET6, host, buffer, buflen, + errnop, h_errnop, AI_V4MAPPED); + if (status == NSS_STATUS_SUCCESS) + return status; + } + + return internal_gethostbyname2_r (name, AF_INET, host, buffer, buflen, + errnop, h_errnop, 0); +} + + +enum nss_status +_nss_nis_gethostbyaddr_r (const void *addr, socklen_t addrlen, int af, + struct hostent *host, char *buffer, size_t buflen, + int *errnop, int *h_errnop) +{ + char *domain; + if (__glibc_unlikely (yp_get_default_domain (&domain))) + return NSS_STATUS_UNAVAIL; + + uintptr_t pad = -(uintptr_t) buffer % __alignof__ (struct parser_data); + buffer += pad; + + struct parser_data *data = (void *) buffer; + if (__glibc_unlikely (buflen < sizeof *data + 1 + pad)) + { + *errnop = ERANGE; + *h_errnop = NETDB_INTERNAL; + return NSS_STATUS_TRYAGAIN; + } + buflen -= pad; + + char *buf = inet_ntoa (*(const struct in_addr *) addr); + + char *result; + int len; + int yperr = yp_match (domain, "hosts.byaddr", buf, strlen (buf), &result, + &len); + + if (__glibc_unlikely (yperr != YPERR_SUCCESS)) + { + enum nss_status retval = yperr2nss (yperr); + + if (retval == NSS_STATUS_TRYAGAIN) + { + *h_errnop = TRY_AGAIN; + *errnop = errno; + } + else if (retval == NSS_STATUS_NOTFOUND) + *h_errnop = HOST_NOT_FOUND; + + return retval; + } + + const size_t linebuflen = buffer + buflen - data->linebuffer; + if (__glibc_unlikely ((size_t) (len + 1) > linebuflen)) + { + free (result); + *errnop = ERANGE; + *h_errnop = NETDB_INTERNAL; + return NSS_STATUS_TRYAGAIN; + } + + char *p = strncpy (data->linebuffer, result, len); + data->linebuffer[len] = '\0'; + while (isspace (*p)) + ++p; + free (result); + + int parse_res = parse_line (p, host, data, buflen, errnop, af, + (res_use_inet6 () ? AI_V4MAPPED : 0)); + if (__glibc_unlikely (parse_res < 1)) + { + if (parse_res == -1) + { + *h_errnop = NETDB_INTERNAL; + return NSS_STATUS_TRYAGAIN; + } + else + { + *h_errnop = HOST_NOT_FOUND; + return NSS_STATUS_NOTFOUND; + } + } + + *h_errnop = NETDB_SUCCESS; + return NSS_STATUS_SUCCESS; +} + + +enum nss_status +_nss_nis_gethostbyname4_r (const char *name, struct gaih_addrtuple **pat, + char *buffer, size_t buflen, int *errnop, + int *herrnop, int32_t *ttlp) +{ + char *domain; + if (yp_get_default_domain (&domain)) + { + *herrnop = NO_DATA; + return NSS_STATUS_UNAVAIL; + } + + /* Convert name to lowercase. */ + size_t namlen = strlen (name); + /* Limit name length to the maximum size of an RPC packet. */ + if (namlen > UDPMSGSIZE) + { + *errnop = ERANGE; + return NSS_STATUS_UNAVAIL; + } + + char name2[namlen + 1]; + size_t i; + + for (i = 0; i < namlen; ++i) + name2[i] = tolower (name[i]); + name2[i] = '\0'; + + char *result; + int len; + int yperr = yp_match (domain, "hosts.byname", name2, namlen, &result, &len); + + if (__glibc_unlikely (yperr != YPERR_SUCCESS)) + { + enum nss_status retval = yperr2nss (yperr); + + if (retval == NSS_STATUS_TRYAGAIN) + { + *herrnop = TRY_AGAIN; + *errnop = errno; + } + if (retval == NSS_STATUS_NOTFOUND) + *herrnop = HOST_NOT_FOUND; + return retval; + } + + if (*pat == NULL) + { + uintptr_t pad = (-(uintptr_t) buffer + % __alignof__ (struct gaih_addrtuple)); + buffer += pad; + buflen = buflen > pad ? buflen - pad : 0; + + if (__glibc_unlikely (buflen < sizeof (struct gaih_addrtuple))) + { + erange: + free (result); + *errnop = ERANGE; + *herrnop = NETDB_INTERNAL; + return NSS_STATUS_TRYAGAIN; + } + + *pat = (struct gaih_addrtuple *) buffer; + buffer += sizeof (struct gaih_addrtuple); + buflen -= sizeof (struct gaih_addrtuple); + } + + uintptr_t pad = -(uintptr_t) buffer % __alignof__ (struct parser_data); + buffer += pad; + + struct parser_data *data = (void *) buffer; + + if (__glibc_unlikely (buflen < sizeof *data + 1 + pad)) + goto erange; + buflen -= pad; + + struct hostent host; + int parse_res = parse_line (result, &host, data, buflen, errnop, AF_UNSPEC, + 0); + if (__glibc_unlikely (parse_res < 1)) + { + if (parse_res == -1) + { + *herrnop = NETDB_INTERNAL; + return NSS_STATUS_TRYAGAIN; + } + else + { + *herrnop = HOST_NOT_FOUND; + return NSS_STATUS_NOTFOUND; + } + } + + (*pat)->next = NULL; + (*pat)->family = host.h_addrtype; + memcpy ((*pat)->addr, host.h_addr_list[0], host.h_length); + (*pat)->scopeid = 0; + assert (host.h_addr_list[1] == NULL); + + /* Undo the alignment for parser_data. */ + buffer -= pad; + buflen += pad; + + size_t h_name_len = strlen (host.h_name) + 1; + if (h_name_len >= buflen) + goto erange; + (*pat)->name = memcpy (buffer, host.h_name, h_name_len); + + free (result); + + return NSS_STATUS_SUCCESS; +} |