nis/nss_nisplus/nisplus-proto.c

   1 /* Copyright (C) 1997, 1998, 2001, 2002, 2003 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 <netdb.h>
  24 #include <string.h>
  25 #include <bits/libc-lock.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_protoent (nis_result * result, struct protoent *proto,
  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   if (result == NULL)
  52     return 0;
  53
  54   if ((result->status != NIS_SUCCESS && result->status != NIS_S_SUCCESS)
  55       || __type_of (NIS_RES_OBJECT (result)) != NIS_ENTRY_OBJ
  56       || strcmp (NIS_RES_OBJECT (result)->EN_data.en_type,
  57                  "protocols_tbl") != 0
  58       || NIS_RES_OBJECT (result)->EN_data.en_cols.en_cols_len < 3)
  59     return 0;
  60
  61   /* Generate the protocols entry format and use the normal parser */
  62   if (NISENTRYLEN (0, 0, result) + 1 > 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   proto->p_name = first_unused;
  72   room_left -= (strlen (first_unused) +1);
  73   first_unused += strlen (first_unused) +1;
  74
  75
  76   if (NISENTRYLEN (0, 2, result) + 1 > room_left)
  77     goto no_more_room;
  78   proto->p_proto = atoi (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), proto->p_name) != 0)
  85         {
  86           if (NISENTRYLEN (i, 1, result) + 2 > room_left)
  87             goto no_more_room;
  88           *p++ = ' ';
  89           p = __stpncpy (p, NISENTRYVAL (i, 1, result),
  90                          NISENTRYLEN (i, 1, result));
  91           *p = '\0';
  92           room_left -= (NISENTRYLEN (i, 1, result) + 1);
  93         }
  94     }
  95   *p++ = '\0';
  96   first_unused = p;
  97
  98   /* Adjust the pointer so it is aligned for
  99      storing pointers.  */
 100   first_unused += __alignof__ (char *) - 1;
 101   first_unused -= ((first_unused - (char *) 0) % __alignof__ (char *));
 102   proto->p_aliases = (char **) first_unused;
 103   if (room_left < sizeof (char *))
 104     goto no_more_room;
 105   room_left -= sizeof (char *);
 106   proto->p_aliases[0] = NULL;
 107
 108   i = 0;
 109   while (*line != '\0')
 110     {
 111       /* Skip leading blanks.  */
 112       while (isspace (*line))
 113         line++;
 114       if (*line == '\0')
 115         break;
 116
 117       if (room_left < sizeof (char *))
 118         goto no_more_room;
 119
 120       room_left -= sizeof (char *);
 121       proto->p_aliases[i] = line;
 122
 123       while (*line != '\0' && *line != ' ')
 124         ++line;
 125
 126       if (*line == ' ')
 127         {
 128           *line = '\0';
 129           ++line;
 130           ++i;
 131         }
 132       else
 133         proto->p_aliases[i+1] = NULL;
 134     }
 135
 136   return 1;
 137 }
 138
 139 static enum nss_status
 140 _nss_create_tablename (int *errnop)
 141 {
 142   if (tablename_val == NULL)
 143     {
 144       char buf [40 + strlen (nis_local_directory ())];
 145       char *p;
 146
 147       p = __stpcpy (buf, "protocols.org_dir.");
 148       p = __stpcpy (p, nis_local_directory ());
 149       tablename_val = __strdup (buf);
 150       if (tablename_val == NULL)
 151         {
 152           *errnop = errno;
 153           return NSS_STATUS_TRYAGAIN;
 154         }
 155       tablename_len = strlen (tablename_val);
 156     }
 157   return NSS_STATUS_SUCCESS;
 158 }
 159
 160 enum nss_status
 161 _nss_nisplus_setprotoent (int stayopen)
 162 {
 163   enum nss_status status = NSS_STATUS_SUCCESS;
 164
 165   __libc_lock_lock (lock);
 166
 167   if (result)
 168     nis_freeresult (result);
 169   result = NULL;
 170
 171   if (tablename_val == NULL)
 172     {
 173       int err;
 174       status = _nss_create_tablename (&err);
 175     }
 176
 177   __libc_lock_unlock (lock);
 178
 179   return status;
 180 }
 181
 182 enum nss_status
 183 _nss_nisplus_endprotoent (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_getprotoent_r (struct protoent *proto, char *buffer,
 198                                 size_t buflen, int *errnop)
 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           if (tablename_val == NULL)
 211             {
 212               enum nss_status status = _nss_create_tablename (errnop);
 213
 214               if (status != NSS_STATUS_SUCCESS)
 215                 return status;
 216             }
 217
 218           result = nis_first_entry (tablename_val);
 219           if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 220             return niserr2nss (result->status);
 221         }
 222       else
 223         {
 224           nis_result *res;
 225
 226           saved_res = result;
 227           res = nis_next_entry (tablename_val, &result->cookie);
 228           result = res;
 229
 230           if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 231             {
 232               nis_freeresult (saved_res);
 233               return niserr2nss (result->status);
 234             }
 235         }
 236
 237       parse_res = _nss_nisplus_parse_protoent (result, proto, buffer,
 238                                                buflen, errnop);
 239       if (parse_res == -1)
 240         {
 241           nis_freeresult (result);
 242           result = saved_res;
 243           *errnop = ERANGE;
 244           return NSS_STATUS_TRYAGAIN;
 245         }
 246       else
 247         {
 248           if (saved_res)
 249             nis_freeresult (saved_res);
 250         }
 251     }
 252   while (!parse_res);
 253
 254   return NSS_STATUS_SUCCESS;
 255 }
 256
 257 enum nss_status
 258 _nss_nisplus_getprotoent_r (struct protoent *result, char *buffer,
 259                             size_t buflen, int *errnop)
 260 {
 261   int status;
 262
 263   __libc_lock_lock (lock);
 264
 265   status = internal_nisplus_getprotoent_r (result, buffer, buflen, errnop);
 266
 267   __libc_lock_unlock (lock);
 268
 269   return status;
 270 }
 271
 272 enum nss_status
 273 _nss_nisplus_getprotobyname_r (const char *name, struct protoent *proto,
 274                                char *buffer, size_t buflen, int *errnop)
 275 {
 276   int parse_res;
 277
 278   if (tablename_val == NULL)
 279     {
 280       enum nss_status status = _nss_create_tablename (errnop);
 281
 282       if (status != NSS_STATUS_SUCCESS)
 283         return status;
 284     }
 285
 286   if (name == NULL)
 287     return NSS_STATUS_NOTFOUND;
 288   else
 289     {
 290       nis_result *result;
 291       char buf[strlen (name) + 255 + tablename_len];
 292       int olderr = errno;
 293
 294       /* Search at first in the alias list, and use the correct name
 295          for the next search */
 296       sprintf (buf, "[name=%s],%s", name, tablename_val);
 297       result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
 298
 299       if (result != NULL)
 300         {
 301           /* If we do not find it, try it as original name. But if the
 302              database is correct, we should find it in the first case, too */
 303           if ((result->status != NIS_SUCCESS
 304                && result->status != NIS_S_SUCCESS)
 305               || __type_of (result->objects.objects_val) != NIS_ENTRY_OBJ
 306               || strcmp (result->objects.objects_val->EN_data.en_type,
 307                          "protocols_tbl") != 0
 308               || result->objects.objects_val->EN_data.en_cols.en_cols_len < 3)
 309             sprintf (buf, "[cname=%s],%s", name, tablename_val);
 310           else
 311             sprintf (buf, "[cname=%s],%s", NISENTRYVAL (0, 0, result),
 312                      tablename_val);
 313
 314           nis_freeresult (result);
 315           result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
 316         }
 317
 318       if (result == NULL)
 319         {
 320           __set_errno (ENOMEM);
 321           return NSS_STATUS_TRYAGAIN;
 322         }
 323       if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 324         {
 325           enum nss_status status = niserr2nss (result->status);
 326
 327           __set_errno (olderr);
 328
 329           nis_freeresult (result);
 330           return status;
 331         }
 332
 333       parse_res = _nss_nisplus_parse_protoent (result, proto, buffer, buflen,
 334                                                errnop);
 335
 336       nis_freeresult (result);
 337
 338       if (parse_res < 1)
 339         {
 340           if (parse_res == -1)
 341             {
 342               *errnop = ERANGE;
 343               return NSS_STATUS_TRYAGAIN;
 344             }
 345           else
 346             {
 347               __set_errno (olderr);
 348               return NSS_STATUS_NOTFOUND;
 349             }
 350         }
 351       return NSS_STATUS_SUCCESS;
 352     }
 353 }
 354
 355 enum nss_status
 356 _nss_nisplus_getprotobynumber_r (const int number, struct protoent *proto,
 357                                  char *buffer, size_t buflen, int *errnop)
 358 {
 359   if (tablename_val == NULL)
 360     {
 361       enum nss_status status = _nss_create_tablename (errnop);
 362
 363       if (status != NSS_STATUS_SUCCESS)
 364         return status;
 365     }
 366
 367   {
 368     int parse_res;
 369     nis_result *result;
 370     char buf[46 + tablename_len];
 371     int olderr = errno;
 372
 373     sprintf (buf, "[number=%d],%s", number, tablename_val);
 374
 375     result = nis_list (buf, FOLLOW_LINKS | FOLLOW_PATH, NULL, NULL);
 376
 377     if (result == NULL)
 378       {
 379         __set_errno (ENOMEM);
 380         return NSS_STATUS_TRYAGAIN;
 381       }
 382     if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 383       {
 384         enum nss_status status = niserr2nss (result->status);
 385
 386         __set_errno (olderr);
 387
 388         nis_freeresult (result);
 389         return status;
 390       }
 391
 392     parse_res = _nss_nisplus_parse_protoent (result, proto, buffer, buflen,
 393                                              errnop);
 394
 395     nis_freeresult (result);
 396
 397     if (parse_res < 1)
 398       {
 399         if (parse_res == -1)
 400           {
 401             *errnop = ERANGE;
 402             return NSS_STATUS_TRYAGAIN;
 403           }
 404         else
 405           {
 406             __set_errno (olderr);
 407             return NSS_STATUS_NOTFOUND;
 408           }
 409       }
 410     return NSS_STATUS_SUCCESS;
 411   }
 412 }