nis/nss_nisplus/nisplus-network.c

   1 /* Copyright (C) 1997, 1998, 2000, 2001 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 Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the 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    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <nss.h>
  21 #include <netdb.h>
  22 #include <errno.h>
  23 #include <ctype.h>
  24 #include <stdint.h>
  25 #include <string.h>
  26 #include <arpa/inet.h>
  27 #include <bits/libc-lock.h>
  28 #include <rpcsvc/nis.h>
  29
  30 #include "nss-nisplus.h"
  31
  32 __libc_lock_define_initialized (static, lock)
  33
  34 static nis_result *result;
  35 static nis_name tablename_val;
  36 static u_long tablename_len;
  37
  38 #define NISENTRYVAL(idx,col,res) \
  39         ((res)->objects.objects_val[(idx)].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)].EN_data.en_cols.en_cols_val[(col)].ec_value.ec_value_len)
  43
  44
  45 static int
  46 _nss_nisplus_parse_netent (nis_result *result, struct netent *network,
  47                             char *buffer, size_t buflen, int *errnop)
  48 {
  49   char *first_unused = buffer;
  50   size_t room_left = buflen;
  51   unsigned int i;
  52   char *p, *line;
  53
  54   if (result == NULL)
  55     return 0;
  56
  57   if ((result->status != NIS_SUCCESS && result->status != NIS_S_SUCCESS)
  58       || __type_of (result->objects.objects_val) != NIS_ENTRY_OBJ
  59       || strcmp (result->objects.objects_val[0].EN_data.en_type,
  60                  "networks_tbl") != 0
  61       || result->objects.objects_val[0].EN_data.en_cols.en_cols_len < 3)
  62     return 0;
  63
  64   if (NISENTRYLEN(0, 0, result) >= room_left)
  65     {
  66       /* The line is too long for our buffer.  */
  67     no_more_room:
  68       *errnop = ERANGE;
  69       return -1;
  70     }
  71
  72   strncpy (first_unused, NISENTRYVAL(0, 0, result),
  73            NISENTRYLEN (0, 0, result));
  74   first_unused[NISENTRYLEN (0, 0, result)] = '\0';
  75   network->n_name = first_unused;
  76   room_left -= (strlen (first_unused) +1);
  77   first_unused += strlen (first_unused) +1;
  78   network->n_addrtype = 0;
  79   network->n_net = inet_network (NISENTRYVAL (0, 2, result));
  80   p = first_unused;
  81
  82   line = p;
  83   for (i = 0; i < result->objects.objects_len; ++i)
  84     {
  85       if (strcmp (NISENTRYVAL (i, 1, result), network->n_name) != 0)
  86         {
  87           if (NISENTRYLEN (i, 1, result) + 2 > room_left)
  88             goto no_more_room;
  89
  90           *p++ = ' ';
  91           p = __stpncpy (p, NISENTRYVAL (i, 1, result),
  92                          NISENTRYLEN (i, 1, result));
  93           *p = '\0';
  94           room_left -= (NISENTRYLEN (i, 1, result) + 1);
  95         }
  96     }
  97   *p++ = '\0';
  98   first_unused = p;
  99
 100   /* Adjust the pointer so it is aligned for
 101      storing pointers.  */
 102   first_unused += __alignof__ (char *) - 1;
 103   first_unused -= ((first_unused - (char *) 0) % __alignof__ (char *));
 104   network->n_aliases = (char **) first_unused;
 105   if (room_left < 2 * sizeof (char *))
 106     goto no_more_room;
 107   room_left -= (2 * sizeof (char *));
 108   network->n_aliases[0] = NULL;
 109
 110   i = 0;
 111   while (*line != '\0')
 112     {
 113       /* Skip leading blanks.  */
 114       while (isspace (*line))
 115         line++;
 116
 117       if (*line == '\0')
 118         break;
 119
 120       if (room_left < sizeof (char *))
 121         goto no_more_room;
 122
 123       room_left -= sizeof (char *);
 124       network->n_aliases[i] = line;
 125
 126       while (*line != '\0' && *line != ' ')
 127         ++line;
 128
 129       if (*line == ' ')
 130         {
 131           *line = '\0';
 132           ++line;
 133           ++i;
 134         }
 135       else
 136         network->n_aliases[i+1] = NULL;
 137     }
 138
 139   return 1;
 140 }
 141
 142 static enum nss_status
 143 _nss_create_tablename (int *errnop)
 144 {
 145   if (tablename_val == NULL)
 146     {
 147       char buf [40 + strlen (nis_local_directory ())];
 148       char *p;
 149
 150       p = __stpcpy (buf, "networks.org_dir.");
 151       p = __stpcpy (p, nis_local_directory ());
 152       tablename_val = __strdup (buf);
 153       if (tablename_val == NULL)
 154         {
 155           *errnop = errno;
 156           return NSS_STATUS_TRYAGAIN;
 157         }
 158       tablename_len = strlen (tablename_val);
 159     }
 160   return NSS_STATUS_SUCCESS;
 161 }
 162
 163 enum nss_status
 164 _nss_nisplus_setnetent (int stayopen)
 165 {
 166   enum nss_status status = NSS_STATUS_SUCCESS;
 167   int err;
 168
 169   __libc_lock_lock (lock);
 170
 171   if (result)
 172     nis_freeresult (result);
 173   result = NULL;
 174
 175   if (tablename_val == NULL)
 176     status = _nss_create_tablename (&err);
 177
 178   __libc_lock_unlock (lock);
 179
 180   return status;
 181 }
 182
 183 enum nss_status
 184 _nss_nisplus_endnetent (void)
 185 {
 186   __libc_lock_lock (lock);
 187
 188   if (result)
 189     nis_freeresult (result);
 190   result = NULL;
 191
 192   __libc_lock_unlock (lock);
 193
 194   return NSS_STATUS_SUCCESS;
 195 }
 196
 197 static enum nss_status
 198 internal_nisplus_getnetent_r (struct netent *network, char *buffer,
 199                                size_t buflen, int *errnop, int *herrnop)
 200 {
 201   int parse_res;
 202
 203   /* Get the next entry until we found a correct one. */
 204   do
 205     {
 206       nis_result *saved_res;
 207
 208       if (result == NULL)
 209         {
 210           saved_res = NULL;
 211
 212           if (tablename_val == NULL)
 213             {
 214               enum nss_status status = _nss_create_tablename (errnop);
 215
 216               if (status != NSS_STATUS_SUCCESS)
 217                 return status;
 218             }
 219
 220           result = nis_first_entry (tablename_val);
 221           if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 222             {
 223               int retval;
 224
 225               retval = niserr2nss (result->status);
 226               nis_freeresult (result);
 227               result = NULL;
 228               if (retval == NSS_STATUS_TRYAGAIN)
 229                 {
 230                   *herrnop = NETDB_INTERNAL;
 231                   *errnop = errno;
 232                   return retval;
 233                 }
 234               else
 235                 return retval;
 236             }
 237         }
 238       else
 239         {
 240           nis_result *res;
 241
 242           res = nis_next_entry (tablename_val, &result->cookie);
 243           saved_res = result;
 244           result = res;
 245           if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 246             {
 247               int retval;
 248
 249               retval = niserr2nss (result->status);
 250               nis_freeresult (result);
 251               result = saved_res;
 252               if (retval == NSS_STATUS_TRYAGAIN)
 253                 {
 254                   *herrnop = NETDB_INTERNAL;
 255                   *errnop = errno;
 256                 }
 257               return retval;
 258             }
 259         }
 260
 261       parse_res = _nss_nisplus_parse_netent (result, network, buffer,
 262                                              buflen, errnop);
 263       if (parse_res == -1)
 264         {
 265           *herrnop = NETDB_INTERNAL;
 266           return NSS_STATUS_TRYAGAIN;
 267         }
 268
 269     } while (!parse_res);
 270
 271   return NSS_STATUS_SUCCESS;
 272 }
 273
 274 enum nss_status
 275 _nss_nisplus_getnetent_r (struct netent *result, char *buffer,
 276                            size_t buflen, int *errnop, int *herrnop)
 277 {
 278   int status;
 279
 280   __libc_lock_lock (lock);
 281
 282   status = internal_nisplus_getnetent_r (result, buffer, buflen, errnop,
 283                                          herrnop);
 284
 285   __libc_lock_unlock (lock);
 286
 287   return status;
 288 }
 289
 290 enum nss_status
 291 _nss_nisplus_getnetbyname_r (const char *name, struct netent *network,
 292                               char *buffer, size_t buflen, int *errnop,
 293                              int *herrnop)
 294 {
 295   int parse_res, retval;
 296
 297   if (tablename_val == NULL)
 298     {
 299       enum nss_status status = _nss_create_tablename (errnop);
 300
 301       if (status != NSS_STATUS_SUCCESS)
 302         return status;
 303     }
 304
 305   if (name == NULL)
 306     {
 307       *errnop = EINVAL;
 308       *herrnop = NETDB_INTERNAL;
 309       return NSS_STATUS_UNAVAIL;
 310     }
 311   else
 312     {
 313       nis_result *result;
 314       char buf[strlen (name) + 255 + tablename_len];
 315
 316       /* Search at first in the alias list, and use the correct name
 317          for the next search */
 318       sprintf (buf, "[name=%s],%s", name, tablename_val);
 319       result = nis_list (buf, FOLLOW_LINKS | FOLLOW_PATH, 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 && result->status != NIS_S_SUCCESS)
 324           || __type_of (result->objects.objects_val) != NIS_ENTRY_OBJ
 325           || strcmp (result->objects.objects_val[0].EN_data.en_type,
 326                      "networks_tbl") != 0
 327           || result->objects.objects_val[0].EN_data.en_cols.en_cols_len < 3)
 328         sprintf (buf, "[cname=%s],%s", name, tablename_val);
 329       else
 330         sprintf (buf, "[cname=%s],%s", NISENTRYVAL (0, 0, result),
 331                  tablename_val);
 332
 333       nis_freeresult (result);
 334       result = nis_list (buf, FOLLOW_LINKS | FOLLOW_PATH, NULL, NULL);
 335
 336       retval = niserr2nss (result->status);
 337       if (retval != NSS_STATUS_SUCCESS)
 338         {
 339           if (retval == NSS_STATUS_TRYAGAIN)
 340             {
 341               *errnop = errno;
 342               *herrnop = NETDB_INTERNAL;
 343             }
 344           nis_freeresult (result);
 345           return retval;
 346         }
 347
 348       parse_res = _nss_nisplus_parse_netent (result, network, buffer, buflen,
 349                                              errnop);
 350
 351       nis_freeresult (result);
 352
 353       if (parse_res > 0)
 354         return NSS_STATUS_SUCCESS;
 355
 356       *herrnop = NETDB_INTERNAL;
 357       if (parse_res == -1)
 358         {
 359           *errnop = ERANGE;
 360           return NSS_STATUS_TRYAGAIN;
 361         }
 362       else
 363         return NSS_STATUS_NOTFOUND;
 364     }
 365 }
 366
 367 /* XXX type is ignored, SUN's NIS+ table doesn't support it */
 368 enum nss_status
 369 _nss_nisplus_getnetbyaddr_r (uint32_t addr, const int type,
 370                              struct netent *network, char *buffer,
 371                              size_t buflen, int *errnop, int *herrnop)
 372 {
 373   if (tablename_val == NULL)
 374     {
 375       enum nss_status status = _nss_create_tablename (errnop);
 376
 377       if (status != NSS_STATUS_SUCCESS)
 378         return status;
 379     }
 380
 381   {
 382     int parse_res, retval;
 383     nis_result *result;
 384     char buf[1024 + tablename_len];
 385     struct in_addr in;
 386     char buf2[256];
 387     int b2len;
 388
 389     in = inet_makeaddr (addr, 0);
 390     strcpy (buf2, inet_ntoa (in));
 391     b2len = strlen (buf2);
 392
 393     while (1)
 394       {
 395         sprintf (buf, "[addr=%s],%s", buf2, tablename_val);
 396         result = nis_list (buf, EXPAND_NAME, NULL, NULL);
 397
 398         retval = niserr2nss (result->status);
 399         if (retval != NSS_STATUS_SUCCESS)
 400           {
 401             if (buf2[b2len -2] == '.' && buf2[b2len -1] == '0')
 402               {
 403                 /* Try again, but with trailing dot(s)
 404                    removed (one by one) */
 405                 buf2[b2len - 2] = '\0';
 406                 b2len -= 2;
 407                 continue;
 408               }
 409             else
 410               return NSS_STATUS_NOTFOUND;
 411
 412             if (retval == NSS_STATUS_TRYAGAIN)
 413               {
 414                 *errnop = errno;
 415                 *herrnop = NETDB_INTERNAL;
 416               }
 417             nis_freeresult (result);
 418             return retval;
 419           }
 420
 421         parse_res = _nss_nisplus_parse_netent (result, network, buffer,
 422                                                buflen, errnop);
 423
 424         nis_freeresult (result);
 425
 426         if (parse_res > 0)
 427           return NSS_STATUS_SUCCESS;
 428
 429         *herrnop = NETDB_INTERNAL;
 430         if (parse_res == -1)
 431           {
 432             *errnop = ERANGE;
 433             return NSS_STATUS_TRYAGAIN;
 434           }
 435         else
 436           return NSS_STATUS_NOTFOUND;
 437       }
 438   }
 439 }