nis/nss_nisplus/nisplus-network.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 <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;
  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 != network->n_aliases[i])
 129         {
 130           if (*line != '\0')
 131             {
 132               *line = '\0';
 133               ++line;
 134             }
 135           ++i;
 136         }
 137       else
 138         network->n_aliases[i] = NULL;
 139     }
 140
 141   return 1;
 142 }
 143
 144 static enum nss_status
 145 _nss_create_tablename (int *errnop)
 146 {
 147   if (tablename_val == NULL)
 148     {
 149       char buf [40 + strlen (nis_local_directory ())];
 150       char *p;
 151
 152       p = __stpcpy (buf, "networks.org_dir.");
 153       p = __stpcpy (p, nis_local_directory ());
 154       tablename_val = __strdup (buf);
 155       if (tablename_val == NULL)
 156         {
 157           *errnop = errno;
 158           return NSS_STATUS_TRYAGAIN;
 159         }
 160       tablename_len = strlen (tablename_val);
 161     }
 162   return NSS_STATUS_SUCCESS;
 163 }
 164
 165 enum nss_status
 166 _nss_nisplus_setnetent (void)
 167 {
 168   enum nss_status status = NSS_STATUS_SUCCESS;
 169   int err;
 170
 171   __libc_lock_lock (lock);
 172
 173   if (result)
 174     nis_freeresult (result);
 175   result = NULL;
 176
 177   if (tablename_val == NULL)
 178     status = _nss_create_tablename (&err);
 179
 180   __libc_lock_unlock (lock);
 181
 182   return status;
 183 }
 184
 185 enum nss_status
 186 _nss_nisplus_endnetent (void)
 187 {
 188   __libc_lock_lock (lock);
 189
 190   if (result)
 191     nis_freeresult (result);
 192   result = NULL;
 193
 194   __libc_lock_unlock (lock);
 195
 196   return NSS_STATUS_SUCCESS;
 197 }
 198
 199 static enum nss_status
 200 internal_nisplus_getnetent_r (struct netent *network, char *buffer,
 201                                size_t buflen, int *errnop, int *herrnop)
 202 {
 203   int parse_res;
 204
 205   /* Get the next entry until we found a correct one. */
 206   do
 207     {
 208       nis_result *saved_res;
 209
 210       if (result == NULL)
 211         {
 212           saved_res = NULL;
 213
 214           if (tablename_val == NULL)
 215             {
 216               enum nss_status status = _nss_create_tablename (errnop);
 217
 218               if (status != NSS_STATUS_SUCCESS)
 219                 return status;
 220             }
 221
 222           result = nis_first_entry (tablename_val);
 223           if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 224             {
 225               int retval;
 226
 227               retval = niserr2nss (result->status);
 228               nis_freeresult (result);
 229               result = NULL;
 230               if (retval == NSS_STATUS_TRYAGAIN)
 231                 {
 232                   *herrnop = NETDB_INTERNAL;
 233                   *errnop = errno;
 234                   return retval;
 235                 }
 236               else
 237                 return retval;
 238             }
 239         }
 240       else
 241         {
 242           nis_result *res;
 243
 244           res = nis_next_entry (tablename_val, &result->cookie);
 245           saved_res = result;
 246           result = res;
 247           if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 248             {
 249               int retval;
 250
 251               retval = niserr2nss (result->status);
 252               nis_freeresult (result);
 253               result = saved_res;
 254               if (retval == NSS_STATUS_TRYAGAIN)
 255                 {
 256                   *herrnop = NETDB_INTERNAL;
 257                   *errnop = errno;
 258                 }
 259               return retval;
 260             }
 261         }
 262
 263       parse_res = _nss_nisplus_parse_netent (result, network, buffer,
 264                                              buflen, errnop);
 265       if (parse_res == -1)
 266         {
 267           *herrnop = NETDB_INTERNAL;
 268           return NSS_STATUS_TRYAGAIN;
 269         }
 270
 271     } while (!parse_res);
 272
 273   return NSS_STATUS_SUCCESS;
 274 }
 275
 276 enum nss_status
 277 _nss_nisplus_getnetent_r (struct netent *result, char *buffer,
 278                            size_t buflen, int *errnop, int *herrnop)
 279 {
 280   int status;
 281
 282   __libc_lock_lock (lock);
 283
 284   status = internal_nisplus_getnetent_r (result, buffer, buflen, errnop,
 285                                          herrnop);
 286
 287   __libc_lock_unlock (lock);
 288
 289   return status;
 290 }
 291
 292 enum nss_status
 293 _nss_nisplus_getnetbyname_r (const char *name, struct netent *network,
 294                               char *buffer, size_t buflen, int *errnop,
 295                              int *herrnop)
 296 {
 297   int parse_res, retval;
 298
 299   if (tablename_val == NULL)
 300     {
 301       enum nss_status status = _nss_create_tablename (errnop);
 302
 303       if (status != NSS_STATUS_SUCCESS)
 304         return status;
 305     }
 306
 307   if (name == NULL)
 308     {
 309       *errnop = EINVAL;
 310       *herrnop = NETDB_INTERNAL;
 311       return NSS_STATUS_UNAVAIL;
 312     }
 313   else
 314     {
 315       nis_result *result;
 316       char buf[strlen (name) + 255 + tablename_len];
 317
 318       /* Search at first in the alias list, and use the correct name
 319          for the next search */
 320       sprintf (buf, "[name=%s],%s", name, tablename_val);
 321       result = nis_list (buf, FOLLOW_LINKS | FOLLOW_PATH, NULL, NULL);
 322
 323       /* If we do not find it, try it as original name. But if the
 324          database is correct, we should find it in the first case, too */
 325       if ((result->status != NIS_SUCCESS && result->status != NIS_S_SUCCESS)
 326           || __type_of (result->objects.objects_val) != NIS_ENTRY_OBJ
 327           || strcmp (result->objects.objects_val[0].EN_data.en_type,
 328                      "networks_tbl") != 0
 329           || result->objects.objects_val[0].EN_data.en_cols.en_cols_len < 3)
 330         sprintf (buf, "[cname=%s],%s", name, tablename_val);
 331       else
 332         sprintf (buf, "[cname=%s],%s", NISENTRYVAL (0, 0, result),
 333                  tablename_val);
 334
 335       nis_freeresult (result);
 336       result = nis_list (buf, FOLLOW_LINKS | FOLLOW_PATH, NULL, NULL);
 337
 338       retval = niserr2nss (result->status);
 339       if (retval != NSS_STATUS_SUCCESS)
 340         {
 341           if (retval == NSS_STATUS_TRYAGAIN)
 342             {
 343               *errnop = errno;
 344               *herrnop = NETDB_INTERNAL;
 345             }
 346           nis_freeresult (result);
 347           return retval;
 348         }
 349
 350       parse_res = _nss_nisplus_parse_netent (result, network, buffer, buflen,
 351                                              errnop);
 352
 353       nis_freeresult (result);
 354
 355       if (parse_res > 0)
 356         return NSS_STATUS_SUCCESS;
 357
 358       *herrnop = NETDB_INTERNAL;
 359       if (parse_res == -1)
 360         {
 361           *errnop = ERANGE;
 362           return NSS_STATUS_TRYAGAIN;
 363         }
 364       else
 365         return NSS_STATUS_NOTFOUND;
 366     }
 367 }
 368
 369 /* XXX type is ignored, SUN's NIS+ table doesn't support it */
 370 enum nss_status
 371 _nss_nisplus_getnetbyaddr_r (const unsigned long addr, const int type,
 372                              struct netent *network, char *buffer,
 373                              size_t buflen, int *errnop, int *herrnop)
 374 {
 375   if (tablename_val == NULL)
 376     {
 377       enum nss_status status = _nss_create_tablename (errnop);
 378
 379       if (status != NSS_STATUS_SUCCESS)
 380         return status;
 381     }
 382
 383   {
 384     int parse_res, retval;
 385     nis_result *result;
 386     char buf[1024 + tablename_len];
 387     struct in_addr in;
 388
 389     in = inet_makeaddr (addr, 0);
 390     sprintf (buf, "[addr=%s],%s", inet_ntoa (in), tablename_val);
 391
 392     result = nis_list (buf, EXPAND_NAME, NULL, NULL);
 393
 394     retval = niserr2nss (result->status);
 395     if (retval != NSS_STATUS_SUCCESS)
 396       {
 397         if (retval == NSS_STATUS_TRYAGAIN)
 398           {
 399             *errnop = errno;
 400             *herrnop = NETDB_INTERNAL;
 401           }
 402         nis_freeresult (result);
 403         return retval;
 404       }
 405
 406     parse_res = _nss_nisplus_parse_netent (result, network, buffer, buflen,
 407                                            errnop);
 408
 409     nis_freeresult (result);
 410
 411     if (parse_res > 0)
 412       return NSS_STATUS_SUCCESS;
 413
 414     *herrnop = NETDB_INTERNAL;
 415     if (parse_res == -1)
 416       {
 417         *errnop = ERANGE;
 418         return NSS_STATUS_TRYAGAIN;
 419       }
 420     else
 421       return NSS_STATUS_NOTFOUND;
 422   }
 423 }