nis/nss_nisplus/nisplus-rpc.c

   1 /* Copyright (C) 1997,1998,2001,2002,2003,2005 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 <atomic.h>
  21 #include <ctype.h>
  22 #include <errno.h>
  23 #include <nss.h>
  24 #include <string.h>
  25 #include <rpc/netdb.h>
  26 #include <rpcsvc/nis.h>
  27 #include <bits/libc-lock.h>
  28
  29 #include "nss-nisplus.h"
  30
  31 __libc_lock_define_initialized (static, lock)
  32
  33 static nis_result *result;
  34 static nis_name tablename_val;
  35 static u_long tablename_len;
  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 static int
  44 _nss_nisplus_parse_rpcent (nis_result *result, struct rpcent *rpc,
  45                            char *buffer, size_t buflen, int *errnop)
  46 {
  47   char *first_unused = buffer;
  48   size_t room_left = buflen;
  49   unsigned int i;
  50   char *p, *line;
  51
  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                  "rpc_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     no_more_room:
  66       *errnop = ERANGE;
  67       return -1;
  68     }
  69   strncpy (first_unused, NISENTRYVAL (0, 0, result),
  70            NISENTRYLEN (0, 0, result));
  71   first_unused[NISENTRYLEN (0, 0, result)] = '\0';
  72   rpc->r_name = first_unused;
  73   room_left -= (strlen (first_unused) + 1);
  74   first_unused += strlen (first_unused) + 1;
  75   rpc->r_number = atoi (NISENTRYVAL (0, 2, result));
  76   p = first_unused;
  77
  78   line = p;
  79   for (i = 0; i < result->objects.objects_len; ++i)
  80     {
  81       if (strcmp (NISENTRYVAL (i, 1, result), rpc->r_name) != 0)
  82         {
  83           if (NISENTRYLEN (i, 1, result) + 2 > room_left)
  84             goto no_more_room;
  85           *p++ = ' ';
  86           p = __stpncpy (p, NISENTRYVAL (i, 1, result),
  87                          NISENTRYLEN (i, 1, result));
  88           *p = '\0';
  89           room_left -= (NISENTRYLEN (i, 1, result) + 1);
  90         }
  91     }
  92   ++p;
  93   first_unused = p;
  94
  95   /* Adjust the pointer so it is aligned for
  96      storing pointers.  */
  97   first_unused += __alignof__ (char *) - 1;
  98   first_unused -= ((first_unused - (char *) 0) % __alignof__ (char *));
  99   rpc->r_aliases = (char **) first_unused;
 100   if (room_left < sizeof (char *))
 101     goto no_more_room;
 102   room_left -= sizeof (char *);
 103   rpc->r_aliases[0] = NULL;
 104
 105   i = 0;
 106   while (*line != '\0')
 107     {
 108       /* Skip leading blanks.  */
 109       while (isspace (*line))
 110         ++line;
 111
 112       if (*line == '\0')
 113         break;
 114
 115       if (room_left < sizeof (char *))
 116         goto no_more_room;
 117
 118       room_left -= sizeof (char *);
 119       rpc->r_aliases[i] = line;
 120
 121       while (*line != '\0' && *line != ' ')
 122         ++line;
 123
 124       if (*line == ' ')
 125         {
 126           *line = '\0';
 127           ++line;
 128           ++i;
 129         }
 130       else
 131         rpc->r_aliases[i+1] = NULL;
 132     }
 133
 134   return 1;
 135 }
 136
 137 static enum nss_status
 138 _nss_create_tablename (int *errnop)
 139 {
 140   if (tablename_val == NULL)
 141     {
 142       const char *local_dir = nis_local_directory ();
 143       size_t local_dir_len = strlen (local_dir);
 144       static const char prefix[] = "rpc.org_dir.";
 145
 146       char *p = malloc (sizeof (prefix) + local_dir_len);
 147       if (tablename_val == NULL)
 148         {
 149           *errnop = errno;
 150           return NSS_STATUS_TRYAGAIN;
 151         }
 152
 153       memcpy (__stpcpy (p, prefix), local_dir, local_dir_len + 1);
 154
 155       tablename_len = sizeof (prefix) - 1 + local_dir_len;
 156
 157       atomic_write_barrier ();
 158
 159       tablename_val = p;
 160     }
 161
 162   return NSS_STATUS_SUCCESS;
 163 }
 164
 165
 166 enum nss_status
 167 _nss_nisplus_setrpcent (int stayopen)
 168 {
 169   enum nss_status status = NSS_STATUS_SUCCESS;
 170
 171   __libc_lock_lock (lock);
 172
 173   if (result != NULL)
 174     {
 175       nis_freeresult (result);
 176       result = NULL;
 177     }
 178
 179   if (tablename_val == NULL)
 180     {
 181       int err;
 182       status = _nss_create_tablename (&err);
 183     }
 184
 185   __libc_lock_unlock (lock);
 186
 187   return status;
 188 }
 189
 190 enum nss_status
 191 _nss_nisplus_endrpcent (void)
 192 {
 193   __libc_lock_lock (lock);
 194
 195   if (result != NULL)
 196     {
 197       nis_freeresult (result);
 198       result = NULL;
 199     }
 200
 201   __libc_lock_unlock (lock);
 202
 203   return NSS_STATUS_SUCCESS;
 204 }
 205
 206 static enum nss_status
 207 internal_nisplus_getrpcent_r (struct rpcent *rpc, char *buffer,
 208                               size_t buflen, int *errnop)
 209 {
 210   int parse_res;
 211
 212   /* Get the next entry until we found a correct one. */
 213   do
 214     {
 215       nis_result *saved_res;
 216
 217       if (result == NULL)
 218         {
 219           saved_res = NULL;
 220           if (tablename_val == NULL)
 221             {
 222               enum nss_status status =  _nss_create_tablename (errnop);
 223
 224               if (status != NSS_STATUS_SUCCESS)
 225                 return status;
 226             }
 227
 228           result = nis_first_entry (tablename_val);
 229           if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 230             return niserr2nss (result->status);
 231         }
 232       else
 233         {
 234           saved_res = result;
 235           result = nis_next_entry (tablename_val, &result->cookie);
 236           if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 237             {
 238               nis_freeresult (saved_res);
 239               return niserr2nss (result->status);
 240             }
 241         }
 242
 243       parse_res = _nss_nisplus_parse_rpcent (result, rpc, buffer,
 244                                              buflen, errnop);
 245       if (parse_res == -1)
 246         {
 247           nis_freeresult (result);
 248           result = saved_res;
 249           *errnop = ERANGE;
 250           return NSS_STATUS_TRYAGAIN;
 251         }
 252       else
 253         {
 254           if (saved_res)
 255             nis_freeresult (saved_res);
 256         }
 257     }
 258   while (!parse_res);
 259
 260   return NSS_STATUS_SUCCESS;
 261 }
 262
 263 enum nss_status
 264 _nss_nisplus_getrpcent_r (struct rpcent *result, char *buffer,
 265                           size_t buflen, int *errnop)
 266 {
 267   int status;
 268
 269   __libc_lock_lock (lock);
 270
 271   status = internal_nisplus_getrpcent_r (result, buffer, buflen, errnop);
 272
 273   __libc_lock_unlock (lock);
 274
 275   return status;
 276 }
 277
 278 enum nss_status
 279 _nss_nisplus_getrpcbyname_r (const char *name, struct rpcent *rpc,
 280                              char *buffer, size_t buflen, int *errnop)
 281 {
 282   int parse_res;
 283
 284   if (tablename_val == NULL)
 285     {
 286       __libc_lock_lock (lock);
 287
 288       enum nss_status status = _nss_create_tablename (errnop);
 289
 290       __libc_lock_unlock (lock);
 291
 292       if (status != NSS_STATUS_SUCCESS)
 293         return status;
 294     }
 295
 296   if (name == NULL)
 297     return NSS_STATUS_NOTFOUND;
 298
 299   char buf[strlen (name) + 10 + tablename_len];
 300   int olderr = errno;
 301
 302   /* Search at first in the alias list, and use the correct name
 303      for the next search */
 304   snprintf (buf, sizeof (buf), "[name=%s],%s", name, tablename_val);
 305   nis_result *result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
 306
 307   if (result != NULL)
 308     {
 309       char *bufptr = buf;
 310
 311       /* If we did not find it, try it as original name. But if the
 312          database is correct, we should find it in the first case, too */
 313       if ((result->status != NIS_SUCCESS
 314            && result->status != NIS_S_SUCCESS)
 315           || __type_of (result->objects.objects_val) != NIS_ENTRY_OBJ
 316           || strcmp (result->objects.objects_val->EN_data.en_type,
 317                      "rpc_tbl") != 0
 318           || result->objects.objects_val->EN_data.en_cols.en_cols_len < 3)
 319         snprintf (buf, sizeof (buf), "[cname=%s],%s", name, tablename_val);
 320       else
 321         {
 322           /* We need to allocate a new buffer since there is no
 323              guarantee the returned name has a length limit.  */
 324           const char *entryval = NISENTRYVAL (0, 0, result);
 325           size_t buflen = strlen (entryval) + 10 + tablename_len;
 326           bufptr = alloca (buflen);
 327           snprintf (bufptr, buflen, "[cname=%s],%s",
 328                     entryval, tablename_val);
 329         }
 330
 331       nis_freeresult (result);
 332       result = nis_list (bufptr, FOLLOW_PATH | FOLLOW_LINKS , NULL, NULL);
 333     }
 334
 335   if (result == NULL)
 336     {
 337       *errnop = ENOMEM;
 338       return NSS_STATUS_TRYAGAIN;
 339     }
 340
 341   if (__builtin_expect (niserr2nss (result->status) != NSS_STATUS_SUCCESS, 0))
 342     {
 343       enum nss_status status = niserr2nss (result->status);
 344
 345       __set_errno (olderr);
 346
 347       nis_freeresult (result);
 348       return status;
 349     }
 350
 351   parse_res = _nss_nisplus_parse_rpcent (result, rpc, buffer, buflen,
 352                                              errnop);
 353
 354   nis_freeresult (result);
 355
 356   if (parse_res < 1)
 357     {
 358       if (parse_res == -1)
 359         {
 360           *errnop = ERANGE;
 361           return NSS_STATUS_TRYAGAIN;
 362         }
 363
 364       __set_errno (olderr);
 365       return NSS_STATUS_NOTFOUND;
 366     }
 367
 368   return NSS_STATUS_SUCCESS;
 369 }
 370
 371 enum nss_status
 372 _nss_nisplus_getrpcbynumber_r (const int number, struct rpcent *rpc,
 373                                char *buffer, size_t buflen, int *errnop)
 374 {
 375   if (tablename_val == NULL)
 376     {
 377       __libc_lock_lock (lock);
 378
 379       enum nss_status status = _nss_create_tablename (errnop);
 380
 381       __libc_lock_unlock (lock);
 382
 383       if (status != NSS_STATUS_SUCCESS)
 384         return status;
 385     }
 386
 387   char buf[12 + 3 * sizeof (number) + tablename_len];
 388   int olderr = errno;
 389
 390   snprintf (buf, sizeof (buf), "[number=%d],%s", number, tablename_val);
 391
 392   nis_result *result = nis_list (buf, FOLLOW_LINKS | FOLLOW_PATH, NULL, NULL);
 393
 394   if (result == NULL)
 395     {
 396       *errnop = ENOMEM;
 397       return NSS_STATUS_TRYAGAIN;
 398     }
 399
 400   if (__builtin_expect (niserr2nss (result->status) != NSS_STATUS_SUCCESS,  0))
 401     {
 402       enum nss_status status = niserr2nss (result->status);
 403
 404       __set_errno (olderr);
 405
 406       nis_freeresult (result);
 407       return status;
 408     }
 409
 410   int parse_res = _nss_nisplus_parse_rpcent (result, rpc, buffer, buflen,
 411                                              errnop);
 412
 413   nis_freeresult (result);
 414
 415   if (parse_res < 1)
 416     {
 417       if (parse_res == -1)
 418         {
 419           *errnop = ERANGE;
 420           return NSS_STATUS_TRYAGAIN;
 421         }
 422       else
 423         {
 424           __set_errno (olderr);
 425           return NSS_STATUS_NOTFOUND;
 426         }
 427     }
 428
 429   return NSS_STATUS_SUCCESS;
 430 }