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 static int
  48 _nss_nisplus_parse_hostent (nis_result *result, int af, struct hostent *host,
  49                             char *buffer, size_t buflen)
  50 {
  51   unsigned int i;
  52   char *first_unused = buffer;
  53   size_t room_left = buflen;
  54   char *data, *p, *line;
  55
  56   if (result == NULL)
  57     return 0;
  58
  59   if ((result->status != NIS_SUCCESS && result->status != NIS_S_SUCCESS) ||
  60       result->objects.objects_val[0].zo_data.zo_type != ENTRY_OBJ ||
  61       strcmp(result->objects.objects_val[0].zo_data.objdata_u.en_data.en_type,
  62              "hosts_tbl") != 0 ||
  63       result->objects.objects_val[0].zo_data.objdata_u.en_data.en_cols.en_cols_len < 4)
  64     return 0;
  65
  66   if (room_left < NISENTRYLEN (0, 2, result) + 1)
  67     {
  68       __set_errno (ERANGE);
  69       return 0;
  70     }
  71
  72   data = first_unused;
  73   if (inet_pton (af, NISENTRYVAL (0, 2, result), data) < 1)
  74     /* Illegal address: ignore line.  */
  75     return 0;
  76
  77   host->h_addrtype = af;
  78   if (af == AF_INET6)
  79     host->h_length = IN6ADDRSZ;
  80   else
  81     {
  82       if (_res.options & RES_USE_INET6)
  83         {
  84           map_v4v6_address (data, data);
  85           host->h_addrtype = AF_INET6;
  86           host->h_length = IN6ADDRSZ;
  87         }
  88       else
  89         {
  90           host->h_addrtype = AF_INET;
  91           host->h_length = INADDRSZ;
  92         }
  93     }
  94   first_unused+=host->h_length;
  95   room_left-=host->h_length;
  96
  97   if (NISENTRYLEN (0, 0, result) + 1 > room_left)
  98     {
  99       __set_errno (ERANGE);
 100       return 0;
 101     }
 102   p = stpncpy (first_unused, NISENTRYVAL (0, 0, result),
 103                NISENTRYLEN (0, 0, result));
 104   *p = '\0';
 105   room_left -= (NISENTRYLEN (0, 0, result) + 1);
 106   host->h_name = first_unused;
 107   first_unused += NISENTRYLEN (0, 0, result) +1;
 108   p = first_unused;
 109
 110   line = p;
 111   for (i = 0; i < result->objects.objects_len; i++)
 112     {
 113       if (strcmp (NISENTRYVAL (i, 1, result), host->h_name) != 0)
 114         {
 115           if (NISENTRYLEN (i, 1, result) + 2 > room_left)
 116             {
 117               __set_errno (ERANGE);
 118               return 0;
 119             }
 120           p = stpcpy(p, " ");
 121           p = stpncpy (p, NISENTRYVAL (i, 1, result),
 122                        NISENTRYLEN (i, 1, result));
 123           *p = '\0';
 124           room_left -= (NISENTRYLEN (i, 1, result) + 1);
 125         }
 126     }
 127   ++p;
 128   first_unused = p;
 129   /* Adjust the pointer so it is aligned for
 130      storing pointers.  */
 131   first_unused += __alignof__ (char *) - 1;
 132   first_unused -= ((first_unused - (char *) 0) % __alignof__ (char *));
 133   host->h_addr_list = (char **) first_unused;
 134   if (room_left < 2 * sizeof (char *))
 135     {
 136       __set_errno (ERANGE);
 137       return 0;
 138     }
 139   room_left -= (2 * sizeof (char *));
 140   host->h_addr_list[0] = data;
 141   host->h_addr_list[1] = NULL;
 142   host->h_aliases = &host->h_addr_list[2];
 143   host->h_aliases[0] = NULL;
 144
 145   i = 0;
 146   while (*line != '\0')
 147     {
 148       /* Skip leading blanks.  */
 149       while (isspace (*line))
 150         line++;
 151
 152       if (*line == '\0')
 153         break;
 154
 155       if (room_left < sizeof (char *))
 156         {
 157           __set_errno (ERANGE);
 158           return 0;
 159         }
 160
 161       room_left -= sizeof (char *);
 162       host->h_aliases[i] = line;
 163
 164       while (*line != '\0' && *line != ' ')
 165         line++;
 166
 167       if (line != host->h_aliases[i])
 168             {
 169               *line = '\0';
 170               line++;
 171               i++;
 172             }
 173     }
 174
 175   return 1;
 176
 177 }
 178
 179 enum nss_status
 180 _nss_nisplus_sethostent (void)
 181 {
 182   __libc_lock_lock (lock);
 183
 184   if (result)
 185     nis_freeresult (result);
 186   result = NULL;
 187   if (names)
 188     {
 189       nis_freenames (names);
 190       names = NULL;
 191     }
 192
 193   __libc_lock_unlock (lock);
 194
 195   return NSS_STATUS_SUCCESS;
 196 }
 197
 198 enum nss_status
 199 _nss_nisplus_endhostent (void)
 200 {
 201   __libc_lock_lock (lock);
 202
 203   if (result)
 204     nis_freeresult (result);
 205   result = NULL;
 206   if (names)
 207     {
 208       nis_freenames (names);
 209       names = NULL;
 210     }
 211
 212   __libc_lock_unlock (lock);
 213
 214   return NSS_STATUS_SUCCESS;
 215 }
 216
 217 static enum nss_status
 218 internal_nisplus_gethostent_r (struct hostent *host, char *buffer,
 219                                size_t buflen, int *herrnop)
 220 {
 221   int parse_res;
 222
 223   /* Get the next entry until we found a correct one. */
 224   do
 225     {
 226       if (result == NULL)
 227         {
 228           names = nis_getnames("hosts.org_dir");
 229           if (names == NULL || names[0] == NULL)
 230             return NSS_STATUS_UNAVAIL;
 231
 232           result = nis_first_entry(names[0]);
 233           if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 234             {
 235               int retval;
 236
 237               retval = niserr2nss (result->status);
 238               if (retval == NSS_STATUS_TRYAGAIN)
 239                 {
 240                   *herrnop = NETDB_INTERNAL;
 241                   __set_errno (EAGAIN);
 242                 }
 243               return retval;
 244             }
 245
 246         }
 247       else
 248         {
 249           nis_result *res2;
 250
 251           res2 = nis_next_entry(names[0], &result->cookie);
 252           nis_freeresult (result);
 253           result = res2;
 254           if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 255             {
 256               int retval;
 257
 258               retval = niserr2nss (result->status);
 259               if (retval == NSS_STATUS_TRYAGAIN)
 260                 {
 261                   *herrnop = NETDB_INTERNAL;
 262                   __set_errno (EAGAIN);
 263                 }
 264               return retval;
 265             }
 266         }
 267
 268       parse_res = _nss_nisplus_parse_hostent (result, AF_INET6,
 269                                               host, buffer, buflen);
 270       if (!parse_res && errno != ERANGE)
 271         parse_res = _nss_nisplus_parse_hostent (result, AF_INET, host,
 272                                                 buffer, buflen);
 273       if (!parse_res && errno == ERANGE)
 274         {
 275           *herrnop = NETDB_INTERNAL;
 276           return NSS_STATUS_TRYAGAIN;
 277         }
 278
 279     } while (!parse_res);
 280
 281   return NSS_STATUS_SUCCESS;
 282 }
 283
 284 enum nss_status
 285 _nss_nisplus_gethostent_r (struct hostent *result, char *buffer,
 286                            size_t buflen, int *herrnop)
 287 {
 288   int status;
 289
 290   __libc_lock_lock (lock);
 291
 292   status = internal_nisplus_gethostent_r (result, buffer, buflen, herrnop);
 293
 294   __libc_lock_unlock (lock);
 295
 296   return status;
 297 }
 298
 299 enum nss_status
 300 _nss_nisplus_gethostbyname2_r (const char *name, int af, struct hostent *host,
 301                               char *buffer, size_t buflen, int *herrnop)
 302 {
 303   int parse_res, retval;
 304
 305   if (name == NULL)
 306     {
 307       __set_errno (EINVAL);
 308       *herrnop = NETDB_INTERNAL;
 309       return NSS_STATUS_NOTFOUND;
 310     }
 311   else
 312     {
 313       nis_result *result;
 314       char buf[strlen (name) + 255];
 315
 316       /* Search at first in the alias list, and use the correct name
 317          for the next search */
 318       sprintf(buf, "[name=%s],hosts.org_dir", name);
 319       result = nis_list(buf, EXPAND_NAME, NULL, NULL);
 320
 321       /* If we do not find it, try it as original name. But if the
 322          database is correct, we should find it in the first case, too */
 323       if ((result->status != NIS_SUCCESS &&
 324            result->status != NIS_S_SUCCESS) ||
 325           result->objects.objects_val[0].zo_data.zo_type != ENTRY_OBJ ||
 326           strcmp(result->objects.objects_val[0].zo_data.objdata_u.en_data.en_type,
 327                  "hosts_tbl") != 0 ||
 328           result->objects.objects_val[0].zo_data.objdata_u.en_data.en_cols.en_cols_len
 329           < 3)
 330         sprintf(buf, "[cname=%s],hosts.org_dir", name);
 331       else
 332         sprintf(buf, "[cname=%s],hosts.org_dir", NISENTRYVAL(0, 0, result));
 333
 334       nis_freeresult (result);
 335       result = nis_list(buf, EXPAND_NAME, NULL, NULL);
 336
 337       retval = niserr2nss (result->status);
 338       if (retval != NSS_STATUS_SUCCESS)
 339         {
 340           if (retval == NSS_STATUS_TRYAGAIN)
 341             {
 342               __set_errno (EAGAIN);
 343               *herrnop = NETDB_INTERNAL;
 344             }
 345           nis_freeresult (result);
 346           return retval;
 347         }
 348
 349       parse_res =
 350         _nss_nisplus_parse_hostent (result, af, host, buffer, buflen);
 351
 352       nis_freeresult (result);
 353
 354       if (parse_res)
 355         return NSS_STATUS_SUCCESS;
 356
 357       *herrnop = NETDB_INTERNAL;
 358       if (!parse_res && errno == ERANGE)
 359         return NSS_STATUS_TRYAGAIN;
 360       else
 361         return NSS_STATUS_NOTFOUND;
 362     }
 363 }
 364
 365 enum nss_status
 366 _nss_nisplus_gethostbyname_r (const char *name, struct hostent *host,
 367                               char *buffer, size_t buflen, int *h_errnop)
 368 {
 369   if (_res.options & RES_USE_INET6)
 370     {
 371       enum nss_status status;
 372
 373       status = _nss_nisplus_gethostbyname2_r (name, AF_INET6, host, buffer,
 374                                               buflen, h_errnop);
 375       if (status == NSS_STATUS_SUCCESS)
 376         return status;
 377     }
 378
 379   return _nss_nisplus_gethostbyname2_r (name, AF_INET, host, buffer,
 380                                         buflen, h_errnop);
 381 }
 382
 383 enum nss_status
 384 _nss_nisplus_gethostbyaddr_r (const char *addr, int addrlen, int type,
 385                               struct hostent *host, char *buffer,
 386                               size_t buflen, int *herrnop)
 387 {
 388   if (addr == NULL)
 389     return NSS_STATUS_NOTFOUND;
 390   else
 391     {
 392       nis_result *result;
 393       char buf[1025];
 394       int retval, parse_res;
 395
 396       snprintf(buf, sizeof (buf) -1, "[addr=%s],hosts.org_dir",
 397                inet_ntoa (*(struct in_addr *)addr));
 398       result = nis_list(buf, EXPAND_NAME, NULL, NULL);
 399
 400       retval = niserr2nss (result->status);
 401       if (retval != NSS_STATUS_SUCCESS)
 402         {
 403           if (retval == NSS_STATUS_TRYAGAIN)
 404             {
 405               __set_errno (EAGAIN);
 406               *herrnop = NETDB_INTERNAL;
 407             }
 408           nis_freeresult (result);
 409           return retval;
 410         }
 411
 412       parse_res = _nss_nisplus_parse_hostent (result, type, host,
 413                                               buffer, buflen);
 414
 415       nis_freeresult (result);
 416
 417       if (parse_res)
 418         return NSS_STATUS_SUCCESS;
 419
 420       *herrnop = NETDB_INTERNAL;
 421       if (!parse_res && errno == ERANGE)
 422         return NSS_STATUS_TRYAGAIN;
 423       else
 424         return NSS_STATUS_NOTFOUND;
 425     }
 426 }