nis/nss_nisplus/nisplus-grp.c

   1 /* Copyright (C) 1997, 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 <grp.h>
  22 #include <ctype.h>
  23 #include <errno.h>
  24 #include <string.h>
  25 #include <bits/libc-lock.h>
  26 #include <rpcsvc/nis.h>
  27
  28 #include "nss-nisplus.h"
  29 #include "nisplus-parser.h"
  30
  31 __libc_lock_define_initialized (static, lock);
  32
  33 static nis_result *result;
  34 static unsigned long next_entry;
  35 static nis_name tablename_val;
  36 static u_long tablename_len;
  37
  38 static enum nss_status
  39 _nss_create_tablename (int *errnop)
  40 {
  41   if (tablename_val == NULL)
  42     {
  43       char buf [40 + strlen (nis_local_directory ())];
  44       char *p;
  45
  46       p = __stpcpy (buf, "group.org_dir.");
  47       p = __stpcpy (p, nis_local_directory ());
  48       tablename_val = __strdup (buf);
  49       if (tablename_val == NULL)
  50         {
  51           *errnop = errno;
  52           return NSS_STATUS_TRYAGAIN;
  53         }
  54       tablename_len = strlen (tablename_val);
  55     }
  56   return NSS_STATUS_SUCCESS;
  57 }
  58
  59 static enum nss_status
  60 internal_setgrent (void)
  61 {
  62   enum nss_status status;
  63   int err;
  64
  65   if (result)
  66     nis_freeresult (result);
  67   result = NULL;
  68   next_entry = 0;
  69
  70   if (tablename_val == NULL)
  71     if (_nss_create_tablename (&err) != NSS_STATUS_SUCCESS)
  72       return NSS_STATUS_UNAVAIL;
  73
  74   result = nis_list (tablename_val, FOLLOW_LINKS | FOLLOW_PATH, NULL, NULL);
  75   if (result == NULL)
  76     {
  77       status = NSS_STATUS_TRYAGAIN;
  78       __set_errno (ENOMEM);
  79     }
  80   else
  81     {
  82       status = niserr2nss (result->status);
  83       if (status != NSS_STATUS_SUCCESS)
  84         {
  85           nis_freeresult (result);
  86           result = NULL;
  87         }
  88     }
  89   return status;
  90 }
  91
  92 enum nss_status
  93 _nss_nisplus_setgrent (int stayopen)
  94 {
  95   enum nss_status status;
  96
  97   __libc_lock_lock (lock);
  98
  99   status = internal_setgrent ();
 100
 101   __libc_lock_unlock (lock);
 102
 103   return status;
 104 }
 105
 106 enum nss_status
 107 _nss_nisplus_endgrent (void)
 108 {
 109   __libc_lock_lock (lock);
 110
 111   if (result)
 112     nis_freeresult (result);
 113   result = NULL;
 114
 115   __libc_lock_unlock (lock);
 116
 117   return NSS_STATUS_SUCCESS;
 118 }
 119
 120 static enum nss_status
 121 internal_nisplus_getgrent_r (struct group *gr, char *buffer, size_t buflen,
 122                              int *errnop)
 123 {
 124   int parse_res;
 125
 126   if (result == NULL)
 127     {
 128       enum nss_status status;
 129
 130       status = internal_setgrent ();
 131       if (result == NULL || status != NSS_STATUS_SUCCESS)
 132         return status;
 133     }
 134
 135   /* Get the next entry until we found a correct one. */
 136   do
 137     {
 138       if (next_entry >= result->objects.objects_len)
 139         return NSS_STATUS_NOTFOUND;
 140
 141       parse_res = _nss_nisplus_parse_grent (result, next_entry, gr,
 142                                             buffer, buflen, errnop);
 143       if (parse_res == -1)
 144         return NSS_STATUS_TRYAGAIN;
 145
 146       ++next_entry;
 147     }
 148   while (!parse_res);
 149
 150   return NSS_STATUS_SUCCESS;
 151 }
 152
 153 enum nss_status
 154 _nss_nisplus_getgrent_r (struct group *result, char *buffer, size_t buflen,
 155                          int *errnop)
 156 {
 157   int status;
 158
 159   __libc_lock_lock (lock);
 160
 161   status = internal_nisplus_getgrent_r (result, buffer, buflen, errnop);
 162
 163   __libc_lock_unlock (lock);
 164
 165   return status;
 166 }
 167
 168 enum nss_status
 169 _nss_nisplus_getgrnam_r (const char *name, struct group *gr,
 170                          char *buffer, size_t buflen, int *errnop)
 171 {
 172   int parse_res;
 173
 174   if (tablename_val == NULL)
 175     {
 176       enum nss_status status = _nss_create_tablename (errnop);
 177
 178       if (status != NSS_STATUS_SUCCESS)
 179         return status;
 180     }
 181
 182   if (name == NULL)
 183     {
 184       *errnop = EINVAL;
 185       return NSS_STATUS_NOTFOUND;
 186     }
 187   else
 188     {
 189       nis_result *result;
 190       char buf[strlen (name) + 24 + tablename_len];
 191       int olderr = errno;
 192
 193       sprintf (buf, "[name=%s],%s", name, tablename_val);
 194
 195       result = nis_list (buf, FOLLOW_LINKS | FOLLOW_PATH, NULL, NULL);
 196
 197       if (result == NULL)
 198         {
 199           *errnop = ENOMEM;
 200           return NSS_STATUS_TRYAGAIN;
 201         }
 202       if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 203         {
 204           enum nss_status status = niserr2nss (result->status);
 205
 206           nis_freeresult (result);
 207           return status;
 208         }
 209
 210       parse_res = _nss_nisplus_parse_grent (result, 0, gr, buffer, buflen,
 211                                             errnop);
 212       nis_freeresult (result);
 213       if (parse_res < 1)
 214         {
 215           if (parse_res == -1)
 216             {
 217               *errnop = ERANGE;
 218               return NSS_STATUS_TRYAGAIN;
 219             }
 220           else
 221             {
 222               __set_errno (olderr);
 223               return NSS_STATUS_NOTFOUND;
 224             }
 225         }
 226       return NSS_STATUS_SUCCESS;
 227     }
 228 }
 229
 230 enum nss_status
 231 _nss_nisplus_getgrgid_r (const gid_t gid, struct group *gr,
 232                          char *buffer, size_t buflen, int *errnop)
 233 {
 234   if (tablename_val == NULL)
 235     {
 236       enum nss_status status = _nss_create_tablename (errnop);
 237
 238       if (status != NSS_STATUS_SUCCESS)
 239         return status;
 240     }
 241
 242   {
 243     int parse_res;
 244     nis_result *result;
 245     char buf[36 + tablename_len];
 246     int olderr = errno;
 247
 248     sprintf (buf, "[gid=%lu],%s", (unsigned long int) gid, tablename_val);
 249
 250     result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
 251
 252     if (result == NULL)
 253       {
 254         *errnop = ENOMEM;
 255         return NSS_STATUS_TRYAGAIN;
 256       }
 257     if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 258       {
 259         enum nss_status status = niserr2nss (result->status);
 260
 261         __set_errno (olderr);
 262
 263         nis_freeresult (result);
 264         return status;
 265       }
 266
 267     parse_res = _nss_nisplus_parse_grent (result, 0, gr, buffer, buflen,
 268                                           errnop);
 269
 270     nis_freeresult (result);
 271     if (parse_res < 1)
 272       {
 273         __set_errno (olderr);
 274
 275         if (parse_res == -1)
 276           {
 277             *errnop = ERANGE;
 278             return NSS_STATUS_TRYAGAIN;
 279           }
 280         else
 281           return NSS_STATUS_NOTFOUND;
 282       }
 283     return NSS_STATUS_SUCCESS;
 284   }
 285 }