nis/nss_nis/nis-grp.c

   1 /* Copyright (C) 1996-1999, 2001-2003, 2004 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Thorsten Kukuk <kukuk@suse.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 /* The following is an ugly trick to avoid a prototype declaration for
  22    _nss_nis_endgrent.  */
  23 #define _nss_nis_endgrent _nss_nis_endgrent_XXX
  24 #include <grp.h>
  25 #undef _nss_nis_endgrent
  26 #include <ctype.h>
  27 #include <errno.h>
  28 #include <string.h>
  29 #include <bits/libc-lock.h>
  30 #include <rpcsvc/yp.h>
  31 #include <rpcsvc/ypclnt.h>
  32
  33 #include "nss-nis.h"
  34
  35 /* Get the declaration of the parser function.  */
  36 #define ENTNAME grent
  37 #define STRUCTURE group
  38 #define EXTERN_PARSER
  39 #include <nss/nss_files/files-parse.c>
  40
  41 /* Protect global state against multiple changers */
  42 __libc_lock_define_initialized (static, lock)
  43
  44 static bool_t new_start = 1;
  45 static char *oldkey;
  46 static int oldkeylen;
  47
  48 enum nss_status
  49 _nss_nis_setgrent (int stayopen)
  50 {
  51   __libc_lock_lock (lock);
  52
  53   new_start = 1;
  54   if (oldkey != NULL)
  55     {
  56       free (oldkey);
  57       oldkey = NULL;
  58       oldkeylen = 0;
  59     }
  60
  61   __libc_lock_unlock (lock);
  62
  63   return NSS_STATUS_SUCCESS;
  64 }
  65 /* Make _nss_nis_endgrent an alias of _nss_nis_setgrent.  We do this
  66    even though the prototypes don't match.  The argument of setgrent
  67    is not used so this makes no difference.  */
  68 strong_alias (_nss_nis_setgrent, _nss_nis_endgrent)
  69
  70 static enum nss_status
  71 internal_nis_getgrent_r (struct group *grp, char *buffer, size_t buflen,
  72                          int *errnop)
  73 {
  74   struct parser_data *data = (void *) buffer;
  75   char *domain, *result, *outkey;
  76   int len, keylen, parse_res;
  77
  78   if (yp_get_default_domain (&domain))
  79     return NSS_STATUS_UNAVAIL;
  80
  81   /* Get the next entry until we found a correct one. */
  82   do
  83     {
  84       enum nss_status retval;
  85       char *p;
  86
  87       if (new_start)
  88         retval = yperr2nss (yp_first (domain, "group.byname",
  89                                       &outkey, &keylen, &result, &len));
  90       else
  91         retval = yperr2nss ( yp_next (domain, "group.byname",
  92                                       oldkey, oldkeylen,
  93                                       &outkey, &keylen, &result, &len));
  94
  95       if (retval != NSS_STATUS_SUCCESS)
  96         {
  97           if (retval == NSS_STATUS_TRYAGAIN)
  98             *errnop = errno;
  99           return retval;
 100         }
 101
 102       if ((size_t) (len + 1) > buflen)
 103         {
 104           free (result);
 105           *errnop = ERANGE;
 106           return NSS_STATUS_TRYAGAIN;
 107         }
 108
 109       p = strncpy (buffer, result, len);
 110       buffer[len] = '\0';
 111       while (isspace (*p))
 112         ++p;
 113       free (result);
 114
 115       parse_res = _nss_files_parse_grent (p, grp, data, buflen, errnop);
 116       if (parse_res == -1)
 117         {
 118           free (outkey);
 119           *errnop = ERANGE;
 120           return NSS_STATUS_TRYAGAIN;
 121         }
 122
 123       free (oldkey);
 124       oldkey = outkey;
 125       oldkeylen = keylen;
 126       new_start = 0;
 127     }
 128   while (parse_res < 1);
 129
 130   return NSS_STATUS_SUCCESS;
 131 }
 132
 133 enum nss_status
 134 _nss_nis_getgrent_r (struct group *result, char *buffer, size_t buflen,
 135                      int *errnop)
 136 {
 137   int status;
 138
 139   __libc_lock_lock (lock);
 140
 141   status = internal_nis_getgrent_r (result, buffer, buflen, errnop);
 142
 143   __libc_lock_unlock (lock);
 144
 145   return status;
 146 }
 147
 148 enum nss_status
 149 _nss_nis_getgrnam_r (const char *name, struct group *grp,
 150                      char *buffer, size_t buflen, int *errnop)
 151 {
 152   struct parser_data *data = (void *) buffer;
 153   enum nss_status retval;
 154   char *domain, *result, *p;
 155   int len, parse_res;
 156
 157   if (name == NULL)
 158     {
 159       *errnop = EINVAL;
 160       return NSS_STATUS_UNAVAIL;
 161     }
 162
 163   if (yp_get_default_domain (&domain))
 164     return NSS_STATUS_UNAVAIL;
 165
 166   retval = yperr2nss (yp_match (domain, "group.byname", name,
 167                                 strlen (name), &result, &len));
 168
 169   if (retval != NSS_STATUS_SUCCESS)
 170     {
 171       if (retval == NSS_STATUS_TRYAGAIN)
 172         *errnop = errno;
 173       return retval;
 174     }
 175
 176   if ((size_t) (len + 1) > buflen)
 177     {
 178       free (result);
 179       *errnop = ERANGE;
 180       return NSS_STATUS_TRYAGAIN;
 181     }
 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_files_parse_grent (p, grp, data, buflen, errnop);
 190   if (parse_res < 1)
 191     {
 192       if (parse_res == -1)
 193         return NSS_STATUS_TRYAGAIN;
 194       else
 195         return NSS_STATUS_NOTFOUND;
 196     }
 197   return NSS_STATUS_SUCCESS;
 198 }
 199
 200 enum nss_status
 201 _nss_nis_getgrgid_r (gid_t gid, struct group *grp,
 202                      char *buffer, size_t buflen, int *errnop)
 203 {
 204   struct parser_data *data = (void *) buffer;
 205   enum nss_status retval;
 206   char *domain, *result, *p;
 207   int len, nlen, parse_res;
 208   char buf[32];
 209
 210   if (yp_get_default_domain (&domain))
 211     return NSS_STATUS_UNAVAIL;
 212
 213   nlen = sprintf (buf, "%lu", (unsigned long int) gid);
 214
 215   retval = yperr2nss (yp_match (domain, "group.bygid", buf,
 216                                 nlen, &result, &len));
 217
 218   if (retval != NSS_STATUS_SUCCESS)
 219     {
 220       if (retval == NSS_STATUS_TRYAGAIN)
 221         *errnop = errno;
 222       return retval;
 223     }
 224
 225   if ((size_t) (len + 1) > buflen)
 226     {
 227       free (result);
 228       *errnop = ERANGE;
 229       return NSS_STATUS_TRYAGAIN;
 230     }
 231
 232   p = strncpy (buffer, result, len);
 233   buffer[len] = '\0';
 234   while (isspace (*p))
 235     ++p;
 236   free (result);
 237
 238   parse_res = _nss_files_parse_grent (p, grp, data, buflen, errnop);
 239   if (parse_res < 1)
 240     {
 241       if (parse_res == -1)
 242         return NSS_STATUS_TRYAGAIN;
 243       else
 244         return NSS_STATUS_NOTFOUND;
 245     }
 246   return NSS_STATUS_SUCCESS;
 247 }