nis/nss_nisplus/nisplus-hosts.c

   1 /* Copyright (C) 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1997.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <nss.h>
  21 #include <netdb.h>
  22 #include <errno.h>
  23 #include <ctype.h>
  24 #include <string.h>
  25 #include <netinet/in.h>
  26 #include <arpa/inet.h>
  27 #include <libc-lock.h>
  28 #include <rpcsvc/nis.h>
  29 #include <rpcsvc/nislib.h>
  30
  31 #include "nss-nisplus.h"
  32
  33 __libc_lock_define_initialized (static, lock)
  34
  35 static nis_result *result = NULL;
  36 static nis_name *names = NULL;
  37
  38 #define NISENTRYVAL(idx,col,res) \
  39         ((res)->objects.objects_val[(idx)].zo_data.objdata_u.en_data.en_cols.en_cols_val[(col)].ec_value.ec_value_val)
  40
  41 #define NISENTRYLEN(idx,col,res) \
  42         ((res)->objects.objects_val[(idx)].zo_data.objdata_u.en_data.en_cols.en_cols_val[(col)].ec_value.ec_value_len)
  43
  44 /* Get implementation for some internal functions. */
  45 #include "../../resolv/mapv4v6addr.h"
  46
  47 #define ENTNAME         hostent
  48 #define DATABASE        "hosts"
  49 #define NEED_H_ERRNO
  50
  51 #define ENTDATA hostent_data
  52 struct hostent_data
  53   {
  54     unsigned char host_addr[16];        /* IPv4 or IPv6 address.  */
  55     char *h_addr_ptrs[2];       /* Points to that and null terminator.  */
  56   };
  57
  58 #define TRAILING_LIST_MEMBER            h_aliases
  59 #define TRAILING_LIST_SEPARATOR_P       isspace
  60 #include "../../nss/nss_files/files-parse.c"
  61 LINE_PARSER
  62 ("#",
  63  {
  64    char *addr;
  65
  66    STRING_FIELD (addr, isspace, 1);
  67
  68    /* Parse address.  */
  69    if (inet_pton (AF_INET6, addr, entdata->host_addr) > 0)
  70      {
  71        result->h_addrtype = AF_INET6;
  72        result->h_length = IN6ADDRSZ;
  73      }
  74    else
  75      if (inet_pton (AF_INET, addr, entdata->host_addr) > 0)
  76        {
  77          if (_res.options & RES_USE_INET6)
  78            {
  79              map_v4v6_address ((char *) entdata->host_addr,
  80                                (char *) entdata->host_addr);
  81              result->h_addrtype = AF_INET6;
  82              result->h_length = IN6ADDRSZ;
  83            }
  84          else
  85            {
  86              result->h_addrtype = AF_INET;
  87              result->h_length = INADDRSZ;
  88            }
  89        }
  90      else
  91        /* Illegal address: ignore line.  */
  92        return 0;
  93
  94    /* Store a pointer to the address in the expected form.  */
  95    entdata->h_addr_ptrs[0] = entdata->host_addr;
  96    entdata->h_addr_ptrs[1] = NULL;
  97    result->h_addr_list = entdata->h_addr_ptrs;
  98
  99    STRING_FIELD (result->h_name, isspace, 1);
 100  }
 101 )
 102
 103
 104 static int
 105 _nss_nisplus_parse_hostent (nis_result *result, struct hostent *host,
 106                             char *buffer, size_t buflen)
 107 {
 108   char *p = buffer;
 109   size_t room_left = buflen;
 110   int parse_res;
 111   unsigned int i;
 112   struct parser_data *data = (void *) buffer;
 113
 114   if (result == NULL)
 115     return 0;
 116
 117   if ((result->status != NIS_SUCCESS && result->status != NIS_S_SUCCESS) ||
 118       result->objects.objects_val[0].zo_data.zo_type != ENTRY_OBJ ||
 119       strcmp(result->objects.objects_val[0].zo_data.objdata_u.en_data.en_type,
 120              "hosts_tbl") != 0 ||
 121       result->objects.objects_val[0].zo_data.objdata_u.en_data.en_cols.en_cols_len < 4)
 122     return 0;
 123
 124   memset (p, '\0', room_left);
 125
 126   /* Generate the hosts entry format and use the normal parser */
 127   if (NISENTRYLEN (0, 2, result) + 1 > room_left)
 128     {
 129       __set_errno (ERANGE);
 130       return 0;
 131     }
 132   strncpy (p, NISENTRYVAL (0, 2, result),
 133            NISENTRYLEN (0, 2, result));
 134   room_left -= (NISENTRYLEN (0, 2, result) + 1);
 135
 136   if (NISENTRYLEN (0, 0, result) + 1 > room_left)
 137     {
 138       __set_errno (ERANGE);
 139       return 0;
 140     }
 141   strcat (p, "\t");
 142   strncat (p, NISENTRYVAL (0, 0, result), NISENTRYLEN (0, 0, result));
 143   room_left -= (NISENTRYLEN (0, 0, result) + 1);
 144                                        /* + 1: We overwrite the last \0 */
 145
 146   for (i = 1; i < result->objects.objects_len; i++)
 147     {
 148       if (NISENTRYLEN (i, 1, result) + 1 > room_left)
 149         {
 150           __set_errno (ERANGE);
 151           return 0;
 152         }
 153       strcat (p, " ");
 154       strcat (p, NISENTRYVAL (i, 1, result));
 155       room_left -= (NISENTRYLEN (i, 1, result) + 1);
 156     }
 157
 158   parse_res = parse_line (p, host, data, buflen);
 159
 160   return parse_res;
 161 }
 162
 163 enum nss_status
 164 _nss_nisplus_sethostent (void)
 165 {
 166   __libc_lock_lock (lock);
 167
 168   if (result)
 169     nis_freeresult (result);
 170   result = NULL;
 171   if (names)
 172     {
 173       nis_freenames (names);
 174       names = NULL;
 175     }
 176
 177   __libc_lock_unlock (lock);
 178
 179   return NSS_STATUS_SUCCESS;
 180 }
 181
 182 enum nss_status
 183 _nss_nisplus_endhostent (void)
 184 {
 185   __libc_lock_lock (lock);
 186
 187   if (result)
 188     nis_freeresult (result);
 189   result = NULL;
 190   if (names)
 191     {
 192       nis_freenames (names);
 193       names = NULL;
 194     }
 195
 196   __libc_lock_unlock (lock);
 197
 198   return NSS_STATUS_SUCCESS;
 199 }
 200
 201 static enum nss_status
 202 internal_nisplus_gethostent_r (struct hostent *host, char *buffer,
 203                                size_t buflen, int *herrnop)
 204 {
 205   int parse_res;
 206
 207   /* Get the next entry until we found a correct one. */
 208   do
 209     {
 210       if (result == NULL)
 211         {
 212           names = nis_getnames("hosts.org_dir");
 213           if (names == NULL || names[0] == NULL)
 214             return NSS_STATUS_UNAVAIL;
 215
 216           result = nis_first_entry(names[0]);
 217           if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 218             {
 219               int retval;
 220
 221               retval = niserr2nss (result->status);
 222               if (retval == NSS_STATUS_TRYAGAIN)
 223                 {
 224                   *herrnop = NETDB_INTERNAL;
 225                   __set_errno (EAGAIN);
 226                 }
 227               return retval;
 228             }
 229
 230         }
 231       else
 232         {
 233           nis_result *res2;
 234
 235           res2 = nis_next_entry(names[0], &result->cookie);
 236           nis_freeresult (result);
 237           result = res2;
 238           if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 239             {
 240               int retval;
 241
 242               retval = niserr2nss (result->status);
 243               if (retval == NSS_STATUS_TRYAGAIN)
 244                 {
 245                   *herrnop = NETDB_INTERNAL;
 246                   __set_errno (EAGAIN);
 247                 }
 248               return retval;
 249             }
 250         }
 251
 252       parse_res = _nss_nisplus_parse_hostent (result, host, buffer, buflen);
 253       if (!parse_res && errno == ERANGE)
 254         {
 255           *herrnop = NETDB_INTERNAL;
 256           return NSS_STATUS_TRYAGAIN;
 257         }
 258
 259     } while (!parse_res);
 260
 261   return NSS_STATUS_SUCCESS;
 262 }
 263
 264 enum nss_status
 265 _nss_nisplus_gethostent_r (struct hostent *result, char *buffer,
 266                            size_t buflen, int *herrnop)
 267 {
 268   int status;
 269
 270   __libc_lock_lock (lock);
 271
 272   status = internal_nisplus_gethostent_r (result, buffer, buflen, herrnop);
 273
 274   __libc_lock_unlock (lock);
 275
 276   return status;
 277 }
 278
 279 enum nss_status
 280 _nss_nisplus_gethostbyname2_r (const char *name, int af, struct hostent *host,
 281                               char *buffer, size_t buflen, int *herrnop)
 282 {
 283   int parse_res, retval;
 284
 285   if (name == NULL)
 286     {
 287       __set_errno (EINVAL);
 288       *herrnop = NETDB_INTERNAL;
 289       return NSS_STATUS_NOTFOUND;
 290     }
 291   else
 292     {
 293       nis_result *result;
 294       char buf[strlen (name) + 255];
 295
 296       /* Search at first in the alias list, and use the correct name
 297          for the next search */
 298       sprintf(buf, "[name=%s],hosts.org_dir", name);
 299       result = nis_list(buf, EXPAND_NAME, NULL, NULL);
 300
 301       /* If we do not find it, try it as original name. But if the
 302          database is correct, we should find it in the first case, too */
 303       if ((result->status != NIS_SUCCESS &&
 304            result->status != NIS_S_SUCCESS) ||
 305           result->objects.objects_val[0].zo_data.zo_type != ENTRY_OBJ ||
 306           strcmp(result->objects.objects_val[0].zo_data.objdata_u.en_data.en_type,
 307                  "hosts_tbl") != 0 ||
 308           result->objects.objects_val[0].zo_data.objdata_u.en_data.en_cols.en_cols_len
 309           < 3)
 310         sprintf(buf, "[cname=%s],hosts.org_dir", name);
 311       else
 312         sprintf(buf, "[cname=%s],hosts.org_dir", NISENTRYVAL(0, 0, result));
 313
 314       nis_freeresult (result);
 315       result = nis_list(buf, EXPAND_NAME, NULL, NULL);
 316
 317       retval = niserr2nss (result->status);
 318       if (retval != NSS_STATUS_SUCCESS)
 319         {
 320           if (retval == NSS_STATUS_TRYAGAIN)
 321             {
 322               __set_errno (EAGAIN);
 323               *herrnop = NETDB_INTERNAL;
 324             }
 325           nis_freeresult (result);
 326           return retval;
 327         }
 328
 329       parse_res = _nss_nisplus_parse_hostent (result, host, buffer, buflen);
 330
 331       nis_freeresult (result);
 332
 333       if (parse_res)
 334         return NSS_STATUS_SUCCESS;
 335
 336       *herrnop = NETDB_INTERNAL;
 337       if (!parse_res && errno == ERANGE)
 338         return NSS_STATUS_TRYAGAIN;
 339       else
 340         return NSS_STATUS_NOTFOUND;
 341     }
 342 }
 343
 344 enum nss_status
 345 _nss_nisplus_gethostbyname_r (const char *name, struct hostent *host,
 346                               char *buffer, size_t buflen, int *h_errnop)
 347 {
 348   if (_res.options & RES_USE_INET6)
 349     {
 350       enum nss_status status;
 351
 352       status = _nss_nisplus_gethostbyname2_r (name, AF_INET6, host, buffer,
 353                                               buflen, h_errnop);
 354       if (status == NSS_STATUS_SUCCESS)
 355         return status;
 356     }
 357
 358   return _nss_nisplus_gethostbyname2_r (name, AF_INET, host, buffer,
 359                                         buflen, h_errnop);
 360 }
 361
 362 enum nss_status
 363 _nss_nisplus_gethostbyaddr_r (const char *addr, struct hostent *host,
 364                               char *buffer, size_t buflen, int *herrnop)
 365 {
 366   if (addr == NULL)
 367     return NSS_STATUS_NOTFOUND;
 368   else
 369     {
 370       nis_result *result;
 371       char buf[24 + strlen (addr)];
 372       int retval, parse_res;
 373
 374       sprintf(buf, "[addr=%s],hosts.org_dir", addr);
 375
 376       result = nis_list(buf, EXPAND_NAME, NULL, NULL);
 377
 378       retval = niserr2nss (result->status);
 379       if (retval != NSS_STATUS_SUCCESS)
 380         {
 381           if (retval == NSS_STATUS_TRYAGAIN)
 382             {
 383               __set_errno (EAGAIN);
 384               *herrnop = NETDB_INTERNAL;
 385             }
 386           nis_freeresult (result);
 387           return retval;
 388         }
 389
 390       parse_res = _nss_nisplus_parse_hostent (result, host, buffer, buflen);
 391
 392       nis_freeresult (result);
 393
 394       if (parse_res)
 395         return NSS_STATUS_SUCCESS;
 396
 397       *herrnop = NETDB_INTERNAL;
 398       if (!parse_res && errno == ERANGE)
 399         return NSS_STATUS_TRYAGAIN;
 400       else
 401         return NSS_STATUS_NOTFOUND;
 402     }
 403 }