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)
  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       __set_errno (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 (void)
 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         return NSS_STATUS_TRYAGAIN;
 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
 167   __libc_lock_lock (lock);
 168
 169   if (result)
 170     nis_freeresult (result);
 171   result = NULL;
 172
 173   if (tablename_val == NULL)
 174     if (_nss_create_tablename () != NSS_STATUS_SUCCESS)
 175       status = NSS_STATUS_UNAVAIL;
 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 *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             if (_nss_create_tablename() != NSS_STATUS_SUCCESS)
 213               return NSS_STATUS_UNAVAIL;
 214
 215           result = nis_first_entry(tablename_val);
 216           if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 217             {
 218               int retval;
 219
 220               retval = niserr2nss (result->status);
 221               nis_freeresult (result);
 222               result = NULL;
 223               if (retval == NSS_STATUS_TRYAGAIN)
 224                 {
 225                   *herrnop = NETDB_INTERNAL;
 226                   __set_errno (EAGAIN);
 227                   return retval;
 228                 }
 229               else
 230                 return retval;
 231             }
 232         }
 233       else
 234         {
 235           nis_result *res;
 236
 237           res = nis_next_entry(tablename_val, &result->cookie);
 238           saved_res = result;
 239           result = res;
 240           if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 241             {
 242               int retval;
 243
 244               retval = niserr2nss (result->status);
 245               nis_freeresult (result);
 246               result = saved_res;
 247               if (retval == NSS_STATUS_TRYAGAIN)
 248                 {
 249                   *herrnop = NETDB_INTERNAL;
 250                   __set_errno (EAGAIN);
 251                 }
 252               return retval;
 253             }
 254         }
 255
 256       if ((parse_res = _nss_nisplus_parse_netent (result, network, buffer,
 257                                                   buflen)) == -1)
 258         {
 259           *herrnop = NETDB_INTERNAL;
 260           return NSS_STATUS_TRYAGAIN;
 261         }
 262
 263     } while (!parse_res);
 264
 265   return NSS_STATUS_SUCCESS;
 266 }
 267
 268 enum nss_status
 269 _nss_nisplus_getnetent_r (struct netent *result, char *buffer,
 270                            size_t buflen, int *herrnop)
 271 {
 272   int status;
 273
 274   __libc_lock_lock (lock);
 275
 276   status = internal_nisplus_getnetent_r (result, buffer, buflen, herrnop);
 277
 278   __libc_lock_unlock (lock);
 279
 280   return status;
 281 }
 282
 283 enum nss_status
 284 _nss_nisplus_getnetbyname_r (const char *name, struct netent *network,
 285                               char *buffer, size_t buflen, int *herrnop)
 286 {
 287   int parse_res, retval;
 288
 289   if (tablename_val == NULL)
 290     if (_nss_create_tablename() != NSS_STATUS_SUCCESS)
 291       return NSS_STATUS_UNAVAIL;
 292
 293   if (name == NULL)
 294     {
 295       __set_errno (EINVAL);
 296       *herrnop = NETDB_INTERNAL;
 297       return NSS_STATUS_UNAVAIL;
 298     }
 299   else
 300     {
 301       nis_result *result;
 302       char buf[strlen (name) + 255 + tablename_len];
 303
 304       /* Search at first in the alias list, and use the correct name
 305          for the next search */
 306       sprintf(buf, "[name=%s],%s", name, tablename_val);
 307       result = nis_list(buf, FOLLOW_LINKS | FOLLOW_PATH, NULL, NULL);
 308
 309       /* If we do not find it, try it as original name. But if the
 310          database is correct, we should find it in the first case, too */
 311       if ((result->status != NIS_SUCCESS &&
 312            result->status != NIS_S_SUCCESS) ||
 313           __type_of (result->objects.objects_val) != NIS_ENTRY_OBJ ||
 314           strcmp(result->objects.objects_val[0].EN_data.en_type,
 315                  "networks_tbl") != 0 ||
 316           result->objects.objects_val[0].EN_data.en_cols.en_cols_len < 3)
 317         sprintf(buf, "[cname=%s],%s", name, tablename_val);
 318       else
 319         sprintf(buf, "[cname=%s],%s", NISENTRYVAL(0, 0, result),
 320                 tablename_val);
 321
 322       nis_freeresult (result);
 323       result = nis_list(buf, FOLLOW_LINKS | FOLLOW_PATH, NULL, NULL);
 324
 325       retval = niserr2nss (result->status);
 326       if (retval != NSS_STATUS_SUCCESS)
 327         {
 328           if (retval == NSS_STATUS_TRYAGAIN)
 329             {
 330               __set_errno (EAGAIN);
 331               *herrnop = NETDB_INTERNAL;
 332             }
 333           nis_freeresult (result);
 334           return retval;
 335         }
 336
 337       parse_res = _nss_nisplus_parse_netent (result, network, buffer, buflen);
 338
 339       nis_freeresult (result);
 340
 341       if (parse_res > 0)
 342         return NSS_STATUS_SUCCESS;
 343
 344       *herrnop = NETDB_INTERNAL;
 345       if (parse_res == -1)
 346         return NSS_STATUS_TRYAGAIN;
 347       else
 348         return NSS_STATUS_NOTFOUND;
 349     }
 350 }
 351
 352 /* XXX type is ignored, SUN's NIS+ table doesn't support it */
 353 enum nss_status
 354 _nss_nisplus_getnetbyaddr_r (const unsigned long addr, const int type,
 355                              struct netent *network,
 356                              char *buffer, size_t buflen, int *herrnop)
 357 {
 358   if (tablename_val == NULL)
 359     if (_nss_create_tablename() != NSS_STATUS_SUCCESS)
 360       return NSS_STATUS_UNAVAIL;
 361
 362   {
 363     int parse_res, retval;
 364     nis_result *result;
 365     char buf[1024 + tablename_len];
 366     struct in_addr in;
 367
 368     in = inet_makeaddr (addr, 0);
 369     sprintf (buf, "[addr=%s],%s", inet_ntoa (in), tablename_val);
 370
 371     result = nis_list(buf, EXPAND_NAME, NULL, NULL);
 372
 373     retval = niserr2nss (result->status);
 374     if (retval != NSS_STATUS_SUCCESS)
 375       {
 376         if (retval == NSS_STATUS_TRYAGAIN)
 377           {
 378             __set_errno (EAGAIN);
 379             *herrnop = NETDB_INTERNAL;
 380           }
 381         nis_freeresult (result);
 382         return retval;
 383       }
 384
 385     parse_res = _nss_nisplus_parse_netent (result, network, buffer, buflen);
 386
 387     nis_freeresult (result);
 388
 389     if (parse_res > 0)
 390       return NSS_STATUS_SUCCESS;
 391
 392     *herrnop = NETDB_INTERNAL;
 393     if (parse_res == -1)
 394       return NSS_STATUS_TRYAGAIN;
 395     else
 396       return NSS_STATUS_NOTFOUND;
 397   }
 398 }