nis/nss_nisplus/nisplus-rpc.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 <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 = NULL;
  33 static nis_name tablename_val = NULL;
  34 static u_long tablename_len = 0;
  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)
  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       __set_errno (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 != rpc->r_aliases[i])
 124         {
 125           if (*line != '\0')
 126             {
 127               *line = '\0';
 128               ++line;
 129             }
 130           ++i;
 131         }
 132       else
 133         rpc->r_aliases[i] = NULL;
 134     }
 135
 136   return 1;
 137 }
 138
 139 static enum nss_status
 140 _nss_create_tablename (void)
 141 {
 142   if (tablename_val == NULL)
 143     {
 144       char buf [40 + strlen (nis_local_directory ())];
 145       char *p;
 146
 147       p = __stpcpy (buf, "rpc.org_dir.");
 148       p = __stpcpy (p, nis_local_directory ());
 149       tablename_val = __strdup (buf);
 150       if (tablename_val == NULL)
 151         return NSS_STATUS_TRYAGAIN;
 152       tablename_len = strlen (tablename_val);
 153     }
 154   return NSS_STATUS_SUCCESS;
 155 }
 156
 157
 158 enum nss_status
 159 _nss_nisplus_setrpcent (void)
 160 {
 161   enum nss_status status = NSS_STATUS_SUCCESS;
 162
 163   __libc_lock_lock (lock);
 164
 165   if (result)
 166     nis_freeresult (result);
 167   result = NULL;
 168
 169   if (tablename_val == NULL)
 170     status = _nss_create_tablename ();
 171
 172   __libc_lock_unlock (lock);
 173
 174   return status;
 175 }
 176
 177 enum nss_status
 178 _nss_nisplus_endrpcent (void)
 179 {
 180   __libc_lock_lock (lock);
 181
 182   if (result)
 183     nis_freeresult (result);
 184   result = NULL;
 185
 186   __libc_lock_unlock (lock);
 187
 188   return NSS_STATUS_SUCCESS;
 189 }
 190
 191 static enum nss_status
 192 internal_nisplus_getrpcent_r (struct rpcent *rpc, char *buffer,
 193                               size_t buflen)
 194 {
 195   int parse_res;
 196
 197   /* Get the next entry until we found a correct one. */
 198   do
 199     {
 200       nis_result *saved_res;
 201
 202       if (result == NULL)
 203         {
 204           saved_res = NULL;
 205           if (tablename_val == NULL)
 206             if (_nss_create_tablename () != NSS_STATUS_SUCCESS)
 207               return NSS_STATUS_UNAVAIL;
 208
 209           result = nis_first_entry(tablename_val);
 210           if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 211             return niserr2nss (result->status);
 212         }
 213       else
 214         {
 215           nis_result *res;
 216
 217           saved_res = result;
 218           res = nis_next_entry (tablename_val, &result->cookie);
 219           result = res;
 220           if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 221             {
 222               nis_freeresult (saved_res);
 223               return niserr2nss (result->status);
 224             }
 225         }
 226
 227       if ((parse_res = _nss_nisplus_parse_rpcent (result, rpc, buffer,
 228                                                   buflen)) == -1)
 229         {
 230           nis_freeresult (result);
 231           result = saved_res;
 232           return NSS_STATUS_TRYAGAIN;
 233         }
 234       else
 235         {
 236           if (saved_res)
 237             nis_freeresult (saved_res);
 238         }
 239     } while (!parse_res);
 240
 241   return NSS_STATUS_SUCCESS;
 242 }
 243
 244 enum nss_status
 245 _nss_nisplus_getrpcent_r (struct rpcent *result, char *buffer,
 246                           size_t buflen)
 247 {
 248   int status;
 249
 250   __libc_lock_lock (lock);
 251
 252   status = internal_nisplus_getrpcent_r (result, buffer, buflen);
 253
 254   __libc_lock_unlock (lock);
 255
 256   return status;
 257 }
 258
 259 enum nss_status
 260 _nss_nisplus_getrpcbyname_r (const char *name, struct rpcent *rpc,
 261                              char *buffer, size_t buflen)
 262 {
 263   int parse_res;
 264
 265   if (tablename_val == NULL)
 266     if (_nss_create_tablename () != NSS_STATUS_SUCCESS)
 267       return NSS_STATUS_UNAVAIL;
 268
 269   if (name == NULL)
 270     return NSS_STATUS_NOTFOUND;
 271   else
 272     {
 273       nis_result *result;
 274       char buf[strlen (name) + 255 + tablename_len];
 275
 276       /* Search at first in the alias list, and use the correct name
 277          for the next search */
 278       sprintf (buf, "[name=%s],%s", name, tablename_val);
 279       result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
 280
 281       /* If we do not find it, try it as original name. But if the
 282          database is correct, we should find it in the first case, too */
 283       if ((result->status != NIS_SUCCESS &&
 284            result->status != NIS_S_SUCCESS) ||
 285           __type_of (result->objects.objects_val) != NIS_ENTRY_OBJ ||
 286           strcmp (result->objects.objects_val->EN_data.en_type,
 287                   "rpc_tbl") != 0 ||
 288           result->objects.objects_val->EN_data.en_cols.en_cols_len < 3)
 289         sprintf (buf, "[cname=%s],%s", name, tablename_val);
 290       else
 291         sprintf (buf, "[cname=%s],%s", NISENTRYVAL(0, 0, result),
 292                  tablename_val);
 293
 294       nis_freeresult (result);
 295       result = nis_list(buf, FOLLOW_PATH | FOLLOW_LINKS , NULL, NULL);
 296
 297       if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 298         {
 299           enum nss_status status = niserr2nss (result->status);
 300
 301           nis_freeresult (result);
 302           return status;
 303         }
 304
 305       parse_res = _nss_nisplus_parse_rpcent (result, rpc, buffer, buflen);
 306
 307       nis_freeresult (result);
 308
 309       if (parse_res == -1)
 310         return NSS_STATUS_TRYAGAIN;
 311
 312       if (parse_res)
 313         return NSS_STATUS_SUCCESS;
 314
 315       return NSS_STATUS_NOTFOUND;
 316     }
 317 }
 318
 319 enum nss_status
 320 _nss_nisplus_getrpcbynumber_r (const int number, struct rpcent *rpc,
 321                                 char *buffer, size_t buflen)
 322 {
 323   if (tablename_val == NULL)
 324     if (_nss_create_tablename () != NSS_STATUS_SUCCESS)
 325       return NSS_STATUS_UNAVAIL;
 326
 327   {
 328     int parse_res;
 329     nis_result *result;
 330     char buf[100 + tablename_len];
 331
 332     sprintf (buf, "[number=%d],%s", number, tablename_val);
 333
 334     result = nis_list(buf, FOLLOW_LINKS | FOLLOW_PATH, NULL, NULL);
 335
 336     if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 337       {
 338         enum nss_status status = niserr2nss (result->status);
 339
 340         nis_freeresult (result);
 341         return status;
 342       }
 343
 344     parse_res = _nss_nisplus_parse_rpcent (result, rpc, buffer, buflen);
 345
 346     nis_freeresult (result);
 347
 348     if (parse_res == -1)
 349       return NSS_STATUS_TRYAGAIN;
 350
 351     if (parse_res)
 352       return NSS_STATUS_SUCCESS;
 353
 354     return NSS_STATUS_NOTFOUND;
 355   }
 356 }