nis/nss_nisplus/nisplus-alias.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 <aliases.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 = NULL;
  33 static u_long next_entry = 0;
  34 static nis_name tablename_val = NULL;
  35 static u_long tablename_len = 0;
  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 enum nss_status
  44 _nss_create_tablename (void)
  45 {
  46   if (tablename_val == NULL)
  47     {
  48       char buf [40 + strlen (nis_local_directory ())];
  49       char *p;
  50
  51       p = __stpcpy (buf, "mail_aliases.org_dir.");
  52       p = __stpcpy (p, nis_local_directory ());
  53       tablename_val = __strdup (buf);
  54       if (tablename_val == NULL)
  55         return NSS_STATUS_TRYAGAIN;
  56       tablename_len = strlen (tablename_val);
  57     }
  58   return NSS_STATUS_SUCCESS;
  59 }
  60
  61 static int
  62 _nss_nisplus_parse_aliasent (nis_result *result, unsigned long entry,
  63                              struct aliasent *alias, char *buffer,
  64                              size_t buflen)
  65 {
  66   if (result == NULL)
  67     return 0;
  68
  69   if ((result->status != NIS_SUCCESS && result->status != NIS_S_SUCCESS) ||
  70       __type_of (&result->objects.objects_val[entry]) != NIS_ENTRY_OBJ ||
  71       strcmp(result->objects.objects_val[entry].EN_data.en_type,
  72              "mail_aliases") != 0 ||
  73       result->objects.objects_val[entry].EN_data.en_cols.en_cols_len < 2)
  74     return 0;
  75   else
  76     {
  77       char *first_unused = buffer + NISENTRYLEN(0, 1, result) + 1;
  78       size_t room_left =
  79         buflen - (buflen % __alignof__ (char *)) -
  80         NISENTRYLEN(0, 1, result) - 2;
  81       char *line;
  82       char *cp;
  83
  84       if (NISENTRYLEN(entry, 1, result) >= buflen)
  85         {
  86           /* The line is too long for our buffer.  */
  87         no_more_room:
  88           __set_errno (ERANGE);
  89           return -1;
  90         }
  91       else
  92         {
  93           strncpy (buffer, NISENTRYVAL(entry, 1, result),
  94                    NISENTRYLEN(entry, 1, result));
  95           buffer[NISENTRYLEN(entry, 1, result)] = '\0';
  96         }
  97
  98       if (NISENTRYLEN(entry, 0, result) >= room_left)
  99         goto no_more_room;
 100
 101       alias->alias_local = 0;
 102       alias->alias_members_len = 0;
 103       *first_unused = '\0';
 104       ++first_unused;
 105       strcpy (first_unused, NISENTRYVAL(entry, 0, result));
 106       first_unused[NISENTRYLEN(entry, 0, result)] = '\0';
 107       alias->alias_name = first_unused;
 108
 109       /* Terminate the line for any case.  */
 110       cp = strpbrk (alias->alias_name, "#\n");
 111       if (cp != NULL)
 112         *cp = '\0';
 113
 114       first_unused += strlen (alias->alias_name) +1;
 115       /* Adjust the pointer so it is aligned for
 116          storing pointers.  */
 117       first_unused += __alignof__ (char *) - 1;
 118       first_unused -= ((first_unused - (char *) 0) % __alignof__ (char *));
 119       alias->alias_members = (char **) first_unused;
 120
 121       line = buffer;
 122
 123       while (*line != '\0')
 124         {
 125           /* Skip leading blanks.  */
 126           while (isspace (*line))
 127             line++;
 128
 129           if (*line == '\0')
 130             break;
 131
 132           if (room_left < sizeof (char *))
 133             goto no_more_room;
 134           room_left -= sizeof (char *);
 135           alias->alias_members[alias->alias_members_len] = line;
 136
 137           while (*line != '\0' && *line != ',')
 138             line++;
 139
 140           if (line != alias->alias_members[alias->alias_members_len])
 141             {
 142               *line = '\0';
 143               line++;
 144               alias->alias_members_len++;
 145             }
 146         }
 147
 148       return alias->alias_members_len == 0 ? 0 : 1;
 149     }
 150 }
 151
 152 static enum nss_status
 153 internal_setaliasent (void)
 154 {
 155   enum nss_status status;
 156
 157   if (result)
 158     nis_freeresult (result);
 159   result = NULL;
 160
 161   if (_nss_create_tablename () != NSS_STATUS_SUCCESS)
 162     return NSS_STATUS_UNAVAIL;
 163
 164   next_entry = 0;
 165   result = nis_list(tablename_val, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
 166   status = niserr2nss (result->status);
 167   if (status != NSS_STATUS_SUCCESS)
 168     {
 169       nis_freeresult (result);
 170       result = NULL;
 171     }
 172   return status;
 173 }
 174
 175 enum nss_status
 176 _nss_nisplus_setaliasent (void)
 177 {
 178   enum nss_status status;
 179
 180   __libc_lock_lock (lock);
 181
 182   status = internal_setaliasent ();
 183
 184   __libc_lock_unlock (lock);
 185
 186   return status;
 187 }
 188
 189 enum nss_status
 190 _nss_nisplus_endaliasent (void)
 191 {
 192   __libc_lock_lock (lock);
 193
 194   if (result)
 195     nis_freeresult (result);
 196   result = NULL;
 197   next_entry = 0;
 198
 199   __libc_lock_unlock (lock);
 200
 201   return NSS_STATUS_SUCCESS;
 202 }
 203
 204 static enum nss_status
 205 internal_nisplus_getaliasent_r (struct aliasent *alias,
 206                                 char *buffer, size_t buflen)
 207 {
 208   int parse_res;
 209
 210   if (result == NULL)
 211     {
 212       enum nss_status status;
 213
 214       status = internal_setaliasent ();
 215       if (result == NULL || status != NSS_STATUS_SUCCESS)
 216         return status;
 217     }
 218
 219   /* Get the next entry until we found a correct one. */
 220   do
 221     {
 222       if (next_entry >= result->objects.objects_len)
 223         return NSS_STATUS_NOTFOUND;
 224
 225       if ((parse_res = _nss_nisplus_parse_aliasent (result, next_entry, alias,
 226                                                     buffer, buflen)) == -1)
 227         return NSS_STATUS_TRYAGAIN;
 228
 229       ++next_entry;
 230     } while (!parse_res);
 231
 232   return NSS_STATUS_SUCCESS;
 233 }
 234
 235 enum nss_status
 236 _nss_nisplus_getaliasent_r (struct aliasent *result, char *buffer,
 237                             size_t buflen)
 238 {
 239   int status;
 240
 241   __libc_lock_lock (lock);
 242
 243   status = internal_nisplus_getaliasent_r (result, buffer, buflen);
 244
 245   __libc_lock_unlock (lock);
 246
 247   return status;
 248 }
 249
 250 enum nss_status
 251 _nss_nisplus_getaliasbyname_r (const char *name, struct aliasent *alias,
 252                             char *buffer, size_t buflen)
 253 {
 254   int parse_res;
 255
 256   if (tablename_val == NULL)
 257     if (_nss_create_tablename() != NSS_STATUS_SUCCESS)
 258       return NSS_STATUS_UNAVAIL;
 259
 260   if (name != NULL || strlen(name) <= 8)
 261     {
 262       nis_result *result;
 263       char buf[strlen (name) + 30 + tablename_len];
 264
 265       sprintf(buf, "[name=%s],%s", name, tablename_val);
 266
 267       result = nis_list(buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
 268
 269       if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 270         return niserr2nss (result->status);
 271
 272       if ((parse_res = _nss_nisplus_parse_aliasent (result, 0, alias,
 273                                                     buffer, buflen)) == -1)
 274         return NSS_STATUS_TRYAGAIN;
 275
 276       if (parse_res)
 277         return NSS_STATUS_SUCCESS;
 278     }
 279   return NSS_STATUS_NOTFOUND;
 280 }