nis/nss_nisplus/nisplus-rpc.c

   1 /* Copyright (C) 1997, 1998, 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 <errno.h>
  22 #include <ctype.h>
  23 #include <string.h>
  24 #include <bits/libc-lock.h>
  25 #include <rpc/netdb.h>
  26 #include <rpcsvc/nis.h>
  27
  28 #include "nss-nisplus.h"
  29
  30 __libc_lock_define_initialized (static, lock)
  31
  32 static nis_result *result;
  33 static nis_name tablename_val;
  34 static u_long tablename_len;
  35
  36 #define NISENTRYVAL(idx,col,res) \
  37         ((res)->objects.objects_val[(idx)].EN_data.en_cols.en_cols_val[(col)].ec_value.ec_value_val)
  38
  39 #define NISENTRYLEN(idx,col,res) \
  40         ((res)->objects.objects_val[(idx)].EN_data.en_cols.en_cols_val[(col)].ec_value.ec_value_len)
  41
  42 static int
  43 _nss_nisplus_parse_rpcent (nis_result *result, struct rpcent *rpc,
  44                            char *buffer, size_t buflen, int *errnop)
  45 {
  46   char *first_unused = buffer;
  47   size_t room_left = buflen;
  48   unsigned int i;
  49   char *p, *line;
  50
  51
  52   if (result == NULL)
  53     return 0;
  54
  55   if ((result->status != NIS_SUCCESS && result->status != NIS_S_SUCCESS)
  56       || __type_of (result->objects.objects_val) != NIS_ENTRY_OBJ
  57       || strcmp (result->objects.objects_val[0].EN_data.en_type,
  58                  "rpc_tbl") != 0
  59       || result->objects.objects_val[0].EN_data.en_cols.en_cols_len < 3)
  60     return 0;
  61
  62   if (NISENTRYLEN (0, 0, result) >= room_left)
  63     {
  64     no_more_room:
  65       *errnop = ERANGE;
  66       return -1;
  67     }
  68   strncpy (first_unused, NISENTRYVAL (0, 0, result),
  69            NISENTRYLEN (0, 0, result));
  70   first_unused[NISENTRYLEN (0, 0, result)] = '\0';
  71   rpc->r_name = first_unused;
  72   room_left -= (strlen (first_unused) + 1);
  73   first_unused += strlen (first_unused) + 1;
  74   rpc->r_number = atoi (NISENTRYVAL (0, 2, result));
  75   p = first_unused;
  76
  77   line = p;
  78   for (i = 0; i < result->objects.objects_len; ++i)
  79     {
  80       if (strcmp (NISENTRYVAL (i, 1, result), rpc->r_name) != 0)
  81         {
  82           if (NISENTRYLEN (i, 1, result) + 2 > room_left)
  83             goto no_more_room;
  84           *p++ = ' ';
  85           p = __stpncpy (p, NISENTRYVAL (i, 1, result),
  86                          NISENTRYLEN (i, 1, result));
  87           *p = '\0';
  88           room_left -= (NISENTRYLEN (i, 1, result) + 1);
  89         }
  90     }
  91   ++p;
  92   first_unused = p;
  93
  94   /* Adjust the pointer so it is aligned for
  95      storing pointers.  */
  96   first_unused += __alignof__ (char *) - 1;
  97   first_unused -= ((first_unused - (char *) 0) % __alignof__ (char *));
  98   rpc->r_aliases = (char **) first_unused;
  99   if (room_left < sizeof (char *))
 100     goto no_more_room;
 101   room_left -= sizeof (char *);
 102   rpc->r_aliases[0] = NULL;
 103
 104   i = 0;
 105   while (*line != '\0')
 106     {
 107       /* Skip leading blanks.  */
 108       while (isspace (*line))
 109         ++line;
 110
 111       if (*line == '\0')
 112         break;
 113
 114       if (room_left < sizeof (char *))
 115         goto no_more_room;
 116
 117       room_left -= sizeof (char *);
 118       rpc->r_aliases[i] = line;
 119
 120       while (*line != '\0' && *line != ' ')
 121         ++line;
 122
 123       if (*line == ' ')
 124         {
 125           *line = '\0';
 126           ++line;
 127           ++i;
 128         }
 129       else
 130         rpc->r_aliases[i+1] = NULL;
 131     }
 132
 133   return 1;
 134 }
 135
 136 static enum nss_status
 137 _nss_create_tablename (int *errnop)
 138 {
 139   if (tablename_val == NULL)
 140     {
 141       char buf [40 + strlen (nis_local_directory ())];
 142       char *p;
 143
 144       p = __stpcpy (buf, "rpc.org_dir.");
 145       p = __stpcpy (p, nis_local_directory ());
 146       tablename_val = __strdup (buf);
 147       if (tablename_val == NULL)
 148         {
 149           *errnop = errno;
 150           return NSS_STATUS_TRYAGAIN;
 151         }
 152       tablename_len = strlen (tablename_val);
 153     }
 154   return NSS_STATUS_SUCCESS;
 155 }
 156
 157
 158 enum nss_status
 159 _nss_nisplus_setrpcent (int stayopen)
 160 {
 161   enum nss_status status = NSS_STATUS_SUCCESS;
 162   int err;
 163
 164   __libc_lock_lock (lock);
 165
 166   if (result)
 167     nis_freeresult (result);
 168   result = NULL;
 169
 170   if (tablename_val == NULL)
 171     status = _nss_create_tablename (&err);
 172
 173   __libc_lock_unlock (lock);
 174
 175   return status;
 176 }
 177
 178 enum nss_status
 179 _nss_nisplus_endrpcent (void)
 180 {
 181   __libc_lock_lock (lock);
 182
 183   if (result)
 184     nis_freeresult (result);
 185   result = NULL;
 186
 187   __libc_lock_unlock (lock);
 188
 189   return NSS_STATUS_SUCCESS;
 190 }
 191
 192 static enum nss_status
 193 internal_nisplus_getrpcent_r (struct rpcent *rpc, char *buffer,
 194                               size_t buflen, int *errnop)
 195 {
 196   int parse_res;
 197
 198   /* Get the next entry until we found a correct one. */
 199   do
 200     {
 201       nis_result *saved_res;
 202
 203       if (result == NULL)
 204         {
 205           saved_res = NULL;
 206           if (tablename_val == NULL)
 207             {
 208               enum nss_status status =  _nss_create_tablename (errnop);
 209
 210               if (status != NSS_STATUS_SUCCESS)
 211                 return status;
 212             }
 213
 214           result = nis_first_entry (tablename_val);
 215           if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 216             return niserr2nss (result->status);
 217         }
 218       else
 219         {
 220           nis_result *res;
 221
 222           saved_res = result;
 223           res = nis_next_entry (tablename_val, &result->cookie);
 224           result = res;
 225           if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 226             {
 227               nis_freeresult (saved_res);
 228               return niserr2nss (result->status);
 229             }
 230         }
 231
 232       parse_res = _nss_nisplus_parse_rpcent (result, rpc, buffer,
 233                                              buflen, errnop);
 234       if (parse_res == -1)
 235         {
 236           nis_freeresult (result);
 237           result = saved_res;
 238           *errnop = ERANGE;
 239           return NSS_STATUS_TRYAGAIN;
 240         }
 241       else
 242         {
 243           if (saved_res)
 244             nis_freeresult (saved_res);
 245         }
 246     } while (!parse_res);
 247
 248   return NSS_STATUS_SUCCESS;
 249 }
 250
 251 enum nss_status
 252 _nss_nisplus_getrpcent_r (struct rpcent *result, char *buffer,
 253                           size_t buflen, int *errnop)
 254 {
 255   int status;
 256
 257   __libc_lock_lock (lock);
 258
 259   status = internal_nisplus_getrpcent_r (result, buffer, buflen, errnop);
 260
 261   __libc_lock_unlock (lock);
 262
 263   return status;
 264 }
 265
 266 enum nss_status
 267 _nss_nisplus_getrpcbyname_r (const char *name, struct rpcent *rpc,
 268                              char *buffer, size_t buflen, int *errnop)
 269 {
 270   int parse_res;
 271
 272   if (tablename_val == NULL)
 273     {
 274       enum nss_status status = _nss_create_tablename (errnop);
 275
 276       if (status != NSS_STATUS_SUCCESS)
 277         return status;
 278     }
 279
 280   if (name == NULL)
 281     return NSS_STATUS_NOTFOUND;
 282   else
 283     {
 284       nis_result *result;
 285       char buf[strlen (name) + 255 + tablename_len];
 286
 287       /* Search at first in the alias list, and use the correct name
 288          for the next search */
 289       sprintf (buf, "[name=%s],%s", name, tablename_val);
 290       result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
 291
 292       /* If we do not find it, try it as original name. But if the
 293          database is correct, we should find it in the first case, too */
 294       if ((result->status != NIS_SUCCESS && result->status != NIS_S_SUCCESS)
 295           || __type_of (result->objects.objects_val) != NIS_ENTRY_OBJ
 296           || strcmp (result->objects.objects_val->EN_data.en_type,
 297                      "rpc_tbl") != 0
 298           || result->objects.objects_val->EN_data.en_cols.en_cols_len < 3)
 299         sprintf (buf, "[cname=%s],%s", name, tablename_val);
 300       else
 301         sprintf (buf, "[cname=%s],%s", NISENTRYVAL (0, 0, result),
 302                  tablename_val);
 303
 304       nis_freeresult (result);
 305       result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS , NULL, NULL);
 306
 307       if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 308         {
 309           enum nss_status status = niserr2nss (result->status);
 310
 311           nis_freeresult (result);
 312           return status;
 313         }
 314
 315       parse_res = _nss_nisplus_parse_rpcent (result, rpc, buffer, buflen,
 316                                              errnop);
 317
 318       nis_freeresult (result);
 319
 320       if (parse_res < 1)
 321         {
 322           if (parse_res == -1)
 323             {
 324               *errnop = ERANGE;
 325               return NSS_STATUS_TRYAGAIN;
 326             }
 327           return NSS_STATUS_NOTFOUND;
 328         }
 329       return NSS_STATUS_SUCCESS;
 330     }
 331 }
 332
 333 enum nss_status
 334 _nss_nisplus_getrpcbynumber_r (const int number, struct rpcent *rpc,
 335                                char *buffer, size_t buflen, int *errnop)
 336 {
 337   if (tablename_val == NULL)
 338     {
 339       enum nss_status status = _nss_create_tablename (errnop);
 340
 341       if (status != NSS_STATUS_SUCCESS)
 342         return status;
 343     }
 344
 345   {
 346     int parse_res;
 347     nis_result *result;
 348     char buf[100 + tablename_len];
 349
 350     sprintf (buf, "[number=%d],%s", number, tablename_val);
 351
 352     result = nis_list(buf, FOLLOW_LINKS | FOLLOW_PATH, NULL, NULL);
 353
 354     if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 355       {
 356         enum nss_status status = niserr2nss (result->status);
 357
 358         nis_freeresult (result);
 359         return status;
 360       }
 361
 362     parse_res = _nss_nisplus_parse_rpcent (result, rpc, buffer, buflen,
 363                                            errnop);
 364
 365     nis_freeresult (result);
 366
 367     if (parse_res < 1)
 368       {
 369         if (parse_res == -1)
 370           {
 371             *errnop = ERANGE;
 372             return NSS_STATUS_TRYAGAIN;
 373           }
 374         else
 375           return NSS_STATUS_NOTFOUND;
 376       }
 377     return NSS_STATUS_SUCCESS;
 378   }
 379 }