nis/nss_nisplus/nisplus-network.c

   1 /* Copyright (C) 1997, 1998 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 <arpa/inet.h>
  26 #include <bits/libc-lock.h>
  27 #include <rpcsvc/nis.h>
  28
  29 #include "nss-nisplus.h"
  30
  31 __libc_lock_define_initialized (static, lock)
  32
  33 static nis_result *result = NULL;
  34 static nis_name tablename_val = NULL;
  35 static u_long tablename_len = 0;
  36
  37 #define NISENTRYVAL(idx,col,res) \
  38         ((res)->objects.objects_val[(idx)].EN_data.en_cols.en_cols_val[(col)].ec_value.ec_value_val)
  39
  40 #define NISENTRYLEN(idx,col,res) \
  41         ((res)->objects.objects_val[(idx)].EN_data.en_cols.en_cols_val[(col)].ec_value.ec_value_len)
  42
  43
  44 static int
  45 _nss_nisplus_parse_netent (nis_result *result, struct netent *network,
  46                             char *buffer, size_t buflen, int *errnop)
  47 {
  48   char *first_unused = buffer;
  49   size_t room_left = buflen;
  50   unsigned int i;
  51   char *p, *line;
  52
  53   if (result == NULL)
  54     return 0;
  55
  56   if ((result->status != NIS_SUCCESS && result->status != NIS_S_SUCCESS)
  57       || __type_of (result->objects.objects_val) != NIS_ENTRY_OBJ
  58       || strcmp (result->objects.objects_val[0].EN_data.en_type,
  59                  "networks_tbl") != 0
  60       || result->objects.objects_val[0].EN_data.en_cols.en_cols_len < 3)
  61     return 0;
  62
  63   if (NISENTRYLEN(0, 0, result) >= room_left)
  64     {
  65       /* The line is too long for our buffer.  */
  66     no_more_room:
  67       *errnop = ERANGE;
  68       return -1;
  69     }
  70
  71   strncpy (first_unused, NISENTRYVAL(0, 0, result),
  72            NISENTRYLEN (0, 0, result));
  73   first_unused[NISENTRYLEN (0, 0, result)] = '\0';
  74   network->n_name = first_unused;
  75   room_left -= (strlen (first_unused) +1);
  76   first_unused += strlen (first_unused) +1;
  77   network->n_addrtype = 0;
  78   network->n_net = inet_network (NISENTRYVAL (0, 2, result));
  79   p = first_unused;
  80
  81   line = p;
  82   for (i = 0; i < result->objects.objects_len; ++i)
  83     {
  84       if (strcmp (NISENTRYVAL (i, 1, result), network->n_name) != 0)
  85         {
  86           if (NISENTRYLEN (i, 1, result) + 2 > room_left)
  87             goto no_more_room;
  88
  89           *p++ = ' ';
  90           p = __stpncpy (p, NISENTRYVAL (i, 1, result),
  91                          NISENTRYLEN (i, 1, result));
  92           *p = '\0';
  93           room_left -= (NISENTRYLEN (i, 1, result) + 1);
  94         }
  95     }
  96   *p++ = '\0';
  97   first_unused = p;
  98
  99   /* Adjust the pointer so it is aligned for
 100      storing pointers.  */
 101   first_unused += __alignof__ (char *) - 1;
 102   first_unused -= ((first_unused - (char *) 0) % __alignof__ (char *));
 103   network->n_aliases = (char **) first_unused;
 104   if (room_left < 2 * sizeof (char *))
 105     goto no_more_room;
 106   room_left -= (2 * sizeof (char *));
 107   network->n_aliases[0] = NULL;
 108
 109   i = 0;
 110   while (*line != '\0')
 111     {
 112       /* Skip leading blanks.  */
 113       while (isspace (*line))
 114         line++;
 115
 116       if (*line == '\0')
 117         break;
 118
 119       if (room_left < sizeof (char *))
 120         goto no_more_room;
 121
 122       room_left -= sizeof (char *);
 123       network->n_aliases[i] = line;
 124
 125       while (*line != '\0' && *line != ' ')
 126         ++line;
 127
 128       if (*line == ' ')
 129         {
 130           *line = '\0';
 131           ++line;
 132           ++i;
 133         }
 134       else
 135         network->n_aliases[i+1] = NULL;
 136     }
 137
 138   return 1;
 139 }
 140
 141 static enum nss_status
 142 _nss_create_tablename (int *errnop)
 143 {
 144   if (tablename_val == NULL)
 145     {
 146       char buf [40 + strlen (nis_local_directory ())];
 147       char *p;
 148
 149       p = __stpcpy (buf, "networks.org_dir.");
 150       p = __stpcpy (p, nis_local_directory ());
 151       tablename_val = __strdup (buf);
 152       if (tablename_val == NULL)
 153         {
 154           *errnop = errno;
 155           return NSS_STATUS_TRYAGAIN;
 156         }
 157       tablename_len = strlen (tablename_val);
 158     }
 159   return NSS_STATUS_SUCCESS;
 160 }
 161
 162 enum nss_status
 163 _nss_nisplus_setnetent (void)
 164 {
 165   enum nss_status status = NSS_STATUS_SUCCESS;
 166   int err;
 167
 168   __libc_lock_lock (lock);
 169
 170   if (result)
 171     nis_freeresult (result);
 172   result = NULL;
 173
 174   if (tablename_val == NULL)
 175     status = _nss_create_tablename (&err);
 176
 177   __libc_lock_unlock (lock);
 178
 179   return status;
 180 }
 181
 182 enum nss_status
 183 _nss_nisplus_endnetent (void)
 184 {
 185   __libc_lock_lock (lock);
 186
 187   if (result)
 188     nis_freeresult (result);
 189   result = NULL;
 190
 191   __libc_lock_unlock (lock);
 192
 193   return NSS_STATUS_SUCCESS;
 194 }
 195
 196 static enum nss_status
 197 internal_nisplus_getnetent_r (struct netent *network, char *buffer,
 198                                size_t buflen, int *errnop, int *herrnop)
 199 {
 200   int parse_res;
 201
 202   /* Get the next entry until we found a correct one. */
 203   do
 204     {
 205       nis_result *saved_res;
 206
 207       if (result == NULL)
 208         {
 209           saved_res = NULL;
 210
 211           if (tablename_val == NULL)
 212             {
 213               enum nss_status status = _nss_create_tablename (errnop);
 214
 215               if (status != NSS_STATUS_SUCCESS)
 216                 return status;
 217             }
 218
 219           result = nis_first_entry (tablename_val);
 220           if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 221             {
 222               int retval;
 223
 224               retval = niserr2nss (result->status);
 225               nis_freeresult (result);
 226               result = NULL;
 227               if (retval == NSS_STATUS_TRYAGAIN)
 228                 {
 229                   *herrnop = NETDB_INTERNAL;
 230                   *errnop = errno;
 231                   return retval;
 232                 }
 233               else
 234                 return retval;
 235             }
 236         }
 237       else
 238         {
 239           nis_result *res;
 240
 241           res = nis_next_entry (tablename_val, &result->cookie);
 242           saved_res = result;
 243           result = res;
 244           if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 245             {
 246               int retval;
 247
 248               retval = niserr2nss (result->status);
 249               nis_freeresult (result);
 250               result = saved_res;
 251               if (retval == NSS_STATUS_TRYAGAIN)
 252                 {
 253                   *herrnop = NETDB_INTERNAL;
 254                   *errnop = errno;
 255                 }
 256               return retval;
 257             }
 258         }
 259
 260       parse_res = _nss_nisplus_parse_netent (result, network, buffer,
 261                                              buflen, errnop);
 262       if (parse_res == -1)
 263         {
 264           *herrnop = NETDB_INTERNAL;
 265           return NSS_STATUS_TRYAGAIN;
 266         }
 267
 268     } while (!parse_res);
 269
 270   return NSS_STATUS_SUCCESS;
 271 }
 272
 273 enum nss_status
 274 _nss_nisplus_getnetent_r (struct netent *result, char *buffer,
 275                            size_t buflen, int *errnop, int *herrnop)
 276 {
 277   int status;
 278
 279   __libc_lock_lock (lock);
 280
 281   status = internal_nisplus_getnetent_r (result, buffer, buflen, errnop,
 282                                          herrnop);
 283
 284   __libc_lock_unlock (lock);
 285
 286   return status;
 287 }
 288
 289 enum nss_status
 290 _nss_nisplus_getnetbyname_r (const char *name, struct netent *network,
 291                               char *buffer, size_t buflen, int *errnop,
 292                              int *herrnop)
 293 {
 294   int parse_res, retval;
 295
 296   if (tablename_val == NULL)
 297     {
 298       enum nss_status status = _nss_create_tablename (errnop);
 299
 300       if (status != NSS_STATUS_SUCCESS)
 301         return status;
 302     }
 303
 304   if (name == NULL)
 305     {
 306       *errnop = EINVAL;
 307       *herrnop = NETDB_INTERNAL;
 308       return NSS_STATUS_UNAVAIL;
 309     }
 310   else
 311     {
 312       nis_result *result;
 313       char buf[strlen (name) + 255 + tablename_len];
 314
 315       /* Search at first in the alias list, and use the correct name
 316          for the next search */
 317       sprintf (buf, "[name=%s],%s", name, tablename_val);
 318       result = nis_list (buf, FOLLOW_LINKS | FOLLOW_PATH, NULL, NULL);
 319
 320       /* If we do not find it, try it as original name. But if the
 321          database is correct, we should find it in the first case, too */
 322       if ((result->status != NIS_SUCCESS && result->status != NIS_S_SUCCESS)
 323           || __type_of (result->objects.objects_val) != NIS_ENTRY_OBJ
 324           || strcmp (result->objects.objects_val[0].EN_data.en_type,
 325                      "networks_tbl") != 0
 326           || result->objects.objects_val[0].EN_data.en_cols.en_cols_len < 3)
 327         sprintf (buf, "[cname=%s],%s", name, tablename_val);
 328       else
 329         sprintf (buf, "[cname=%s],%s", NISENTRYVAL (0, 0, result),
 330                  tablename_val);
 331
 332       nis_freeresult (result);
 333       result = nis_list (buf, FOLLOW_LINKS | FOLLOW_PATH, NULL, NULL);
 334
 335       retval = niserr2nss (result->status);
 336       if (retval != NSS_STATUS_SUCCESS)
 337         {
 338           if (retval == NSS_STATUS_TRYAGAIN)
 339             {
 340               *errnop = errno;
 341               *herrnop = NETDB_INTERNAL;
 342             }
 343           nis_freeresult (result);
 344           return retval;
 345         }
 346
 347       parse_res = _nss_nisplus_parse_netent (result, network, buffer, buflen,
 348                                              errnop);
 349
 350       nis_freeresult (result);
 351
 352       if (parse_res > 0)
 353         return NSS_STATUS_SUCCESS;
 354
 355       *herrnop = NETDB_INTERNAL;
 356       if (parse_res == -1)
 357         {
 358           *errnop = ERANGE;
 359           return NSS_STATUS_TRYAGAIN;
 360         }
 361       else
 362         return NSS_STATUS_NOTFOUND;
 363     }
 364 }
 365
 366 /* XXX type is ignored, SUN's NIS+ table doesn't support it */
 367 enum nss_status
 368 _nss_nisplus_getnetbyaddr_r (const unsigned long addr, const int type,
 369                              struct netent *network, char *buffer,
 370                              size_t buflen, int *errnop, int *herrnop)
 371 {
 372   if (tablename_val == NULL)
 373     {
 374       enum nss_status status = _nss_create_tablename (errnop);
 375
 376       if (status != NSS_STATUS_SUCCESS)
 377         return status;
 378     }
 379
 380   {
 381     int parse_res, retval;
 382     nis_result *result;
 383     char buf[1024 + tablename_len];
 384     struct in_addr in;
 385     char buf2[256];
 386     int b2len;
 387
 388     in = inet_makeaddr (addr, 0);
 389     strcpy (buf2, inet_ntoa (in));
 390     b2len = strlen (buf2);
 391
 392     while (1)
 393       {
 394         sprintf (buf, "[addr=%s],%s", buf2, tablename_val);
 395         result = nis_list (buf, EXPAND_NAME, NULL, NULL);
 396
 397         retval = niserr2nss (result->status);
 398         if (retval != NSS_STATUS_SUCCESS)
 399           {
 400             if (buf2[b2len -2] == '.' && buf2[b2len -1] == '0')
 401               {
 402                 /* Try again, but with trailing dot(s)
 403                    removed (one by one) */
 404                 buf2[b2len - 2] = '\0';
 405                 b2len -= 2;
 406                 continue;
 407               }
 408             else
 409               return NSS_STATUS_NOTFOUND;
 410
 411             if (retval == NSS_STATUS_TRYAGAIN)
 412               {
 413                 *errnop = errno;
 414                 *herrnop = NETDB_INTERNAL;
 415               }
 416             nis_freeresult (result);
 417             return retval;
 418           }
 419
 420         parse_res = _nss_nisplus_parse_netent (result, network, buffer,
 421                                                buflen, errnop);
 422
 423         nis_freeresult (result);
 424
 425         if (parse_res > 0)
 426           return NSS_STATUS_SUCCESS;
 427
 428         *herrnop = NETDB_INTERNAL;
 429         if (parse_res == -1)
 430           {
 431             *errnop = ERANGE;
 432             return NSS_STATUS_TRYAGAIN;
 433           }
 434         else
 435           return NSS_STATUS_NOTFOUND;
 436       }
 437   }
 438 }