nis/nss_nis/nis-alias.c

   1 /* Copyright (C) 1996, 1997, 1998, 1999i, 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>, 1996.
   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 <ctype.h>
  22 #include <errno.h>
  23 #include <string.h>
  24 #include <aliases.h>
  25 #include <bits/libc-lock.h>
  26 #include <rpcsvc/yp.h>
  27 #include <rpcsvc/ypclnt.h>
  28
  29 #include "nss-nis.h"
  30
  31 __libc_lock_define_initialized (static, lock)
  32
  33 static bool_t new_start = 1;
  34 static char *oldkey;
  35 static int oldkeylen;
  36
  37 static int
  38 _nss_nis_parse_aliasent (const char *key, char *alias, struct aliasent *result,
  39                          char *buffer, size_t buflen, int *errnop)
  40 {
  41   char *first_unused = buffer + strlen (alias) + 1;
  42   size_t room_left =
  43     buflen - (buflen % __alignof__ (char *)) - strlen (alias) - 2;
  44   char *line;
  45   char *cp;
  46
  47   result->alias_members_len = 0;
  48   *first_unused = '\0';
  49   first_unused++;
  50   strcpy (first_unused, key);
  51
  52   if (first_unused[room_left - 1] != '\0')
  53     {
  54       /* The line is too long for our buffer.  */
  55     no_more_room:
  56       *errnop = ERANGE;
  57       return -1;
  58     }
  59
  60   result->alias_name = first_unused;
  61
  62   /* Terminate the line for any case.  */
  63   cp = strpbrk (alias, "#\n");
  64   if (cp != NULL)
  65     *cp = '\0';
  66
  67   first_unused += strlen (result->alias_name) + 1;
  68   /* Adjust the pointer so it is aligned for
  69      storing pointers.  */
  70   first_unused += __alignof__ (char *) - 1;
  71   first_unused -= ((first_unused - (char *) 0) % __alignof__ (char *));
  72   result->alias_members = (char **) first_unused;
  73
  74   line = alias;
  75
  76   while (*line != '\0')
  77     {
  78       /* Skip leading blanks.  */
  79       while (isspace (*line))
  80         line++;
  81
  82       if (*line == '\0')
  83         break;
  84
  85       if (room_left < sizeof (char *))
  86           goto no_more_room;
  87       room_left -= sizeof (char *);
  88       result->alias_members[result->alias_members_len] = line;
  89
  90       while (*line != '\0' && *line != ',')
  91         line++;
  92
  93       if (line != result->alias_members[result->alias_members_len])
  94         {
  95           *line = '\0';
  96           line++;
  97           result->alias_members_len++;
  98         }
  99     }
 100   return result->alias_members_len == 0 ? 0 : 1;
 101 }
 102
 103 enum nss_status
 104 _nss_nis_setaliasent (void)
 105 {
 106   __libc_lock_lock (lock);
 107
 108   new_start = 1;
 109   if (oldkey != NULL)
 110     {
 111       free (oldkey);
 112       oldkey = NULL;
 113       oldkeylen = 0;
 114     }
 115
 116   __libc_lock_unlock (lock);
 117
 118   return NSS_STATUS_SUCCESS;
 119 }
 120
 121 enum nss_status
 122 _nss_nis_endaliasent (void)
 123 {
 124   __libc_lock_lock (lock);
 125
 126   new_start = 1;
 127   if (oldkey != NULL)
 128     {
 129       free (oldkey);
 130       oldkey = NULL;
 131       oldkeylen = 0;
 132     }
 133
 134   __libc_lock_unlock (lock);
 135
 136   return NSS_STATUS_SUCCESS;
 137 }
 138
 139 static enum nss_status
 140 internal_nis_getaliasent_r (struct aliasent *alias, char *buffer,
 141                             size_t buflen, int *errnop)
 142 {
 143   char *domain;
 144   char *result;
 145   int len;
 146   char *outkey;
 147   int keylen;
 148   char *p;
 149   int parse_res;
 150
 151   if (yp_get_default_domain (&domain))
 152     return NSS_STATUS_UNAVAIL;
 153
 154   alias->alias_local = 0;
 155
 156   /* Get the next entry until we found a correct one. */
 157   do
 158     {
 159       enum nss_status retval;
 160
 161       if (new_start)
 162         retval = yperr2nss (yp_first (domain, "mail.aliases",
 163                                       &outkey, &keylen, &result, &len));
 164       else
 165         retval = yperr2nss ( yp_next (domain, "mail.aliases", oldkey,
 166                                       oldkeylen, &outkey, &keylen,
 167                                       &result, &len));
 168       if (retval != NSS_STATUS_SUCCESS)
 169         {
 170           if (retval == NSS_STATUS_NOTFOUND)
 171             *errnop = ENOENT;
 172           else if (retval == NSS_STATUS_TRYAGAIN)
 173             *errnop = errno;
 174           return retval;
 175         }
 176
 177       if ((size_t) (len + 1) > buflen)
 178         {
 179           free (result);
 180           *errnop = ERANGE;
 181           return NSS_STATUS_TRYAGAIN;
 182         }
 183       p = strncpy (buffer, result, len);
 184       buffer[len] = '\0';
 185       while (isspace (*p))
 186         ++p;
 187       free (result);
 188
 189       parse_res = _nss_nis_parse_aliasent (outkey, p, alias, buffer, buflen,
 190                                            errnop);
 191       if (parse_res == -1)
 192         {
 193           free (outkey);
 194           *errnop = ERANGE;
 195           return NSS_STATUS_TRYAGAIN;
 196         }
 197
 198       free (oldkey);
 199       oldkey = outkey;
 200       oldkeylen = keylen;
 201       new_start = 0;
 202     }
 203   while (!parse_res);
 204
 205   return NSS_STATUS_SUCCESS;
 206 }
 207
 208 enum nss_status
 209 _nss_nis_getaliasent_r (struct aliasent *alias, char *buffer, size_t buflen,
 210                         int *errnop)
 211 {
 212   enum nss_status status;
 213
 214   __libc_lock_lock (lock);
 215
 216   status = internal_nis_getaliasent_r (alias, buffer, buflen, errnop);
 217
 218   __libc_lock_unlock (lock);
 219
 220   return status;
 221 }
 222
 223 enum nss_status
 224 _nss_nis_getaliasbyname_r (const char *name, struct aliasent *alias,
 225                            char *buffer, size_t buflen, int *errnop)
 226 {
 227   enum nss_status retval;
 228   int parse_res;
 229   char *domain;
 230   char *result;
 231   int len;
 232   char *p;
 233   size_t namlen = strlen (name);
 234   char name2[namlen + 1];
 235   int i;
 236
 237   if (name == NULL)
 238     {
 239       *errnop = EINVAL;
 240       return NSS_STATUS_UNAVAIL;
 241     }
 242
 243   if (yp_get_default_domain (&domain))
 244     return NSS_STATUS_UNAVAIL;
 245
 246   /* Convert name to lowercase.  */
 247   for (i = 0; i < namlen; ++i)
 248     name2[i] = _tolower (name[i]);
 249   name2[i] = '\0';
 250
 251   retval = yperr2nss (yp_match (domain, "mail.aliases", name2, namlen,
 252                                 &result, &len));
 253
 254   if (retval != NSS_STATUS_SUCCESS)
 255     {
 256       if (retval == NSS_STATUS_TRYAGAIN)
 257         *errnop = errno;
 258       return retval;
 259     }
 260
 261   if ((size_t) (len + 1) > buflen)
 262     {
 263       free (result);
 264       *errnop = ERANGE;
 265       return NSS_STATUS_TRYAGAIN;
 266     }
 267
 268   p = strncpy (buffer, result, len);
 269   buffer[len] = '\0';
 270   while (isspace (*p))
 271     ++p;
 272   free (result);
 273
 274   alias->alias_local = 0;
 275   parse_res = _nss_nis_parse_aliasent (name, p, alias, buffer, buflen, errnop);
 276   if (parse_res < 1)
 277     {
 278       if (parse_res == -1)
 279         return NSS_STATUS_TRYAGAIN;
 280       else
 281         {
 282           *errnop = ENOENT;
 283           return NSS_STATUS_NOTFOUND;
 284         }
 285     }
 286
 287   return NSS_STATUS_SUCCESS;
 288 }