nis/nss_nis/nis-grp.c

   1 /* Copyright (C) 1996 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 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 <grp.h>
  22 #include <ctype.h>
  23 #include <errno.h>
  24 #include <string.h>
  25 #include <libc-lock.h>
  26 #include <rpcsvc/yp.h>
  27 #include <rpcsvc/ypclnt.h>
  28
  29 #include "nss-nis.h"
  30
  31 /* Get the declaration of the parser function.  */
  32 #define ENTNAME grent
  33 #define STRUCTURE group
  34 #define EXTERN_PARSER
  35 #include "../nss/nss_files/files-parse.c"
  36
  37 /* Protect global state against multiple changers */
  38 __libc_lock_define_initialized (static, lock)
  39
  40 static bool_t new_start = 1;
  41 static char *oldkey = NULL;
  42 static int oldkeylen = 0;
  43
  44 enum nss_status
  45 _nss_nis_setgrent (void)
  46 {
  47   __libc_lock_lock (lock);
  48
  49   new_start = 1;
  50   if (oldkey != NULL)
  51     {
  52       free (oldkey);
  53       oldkey = NULL;
  54       oldkeylen = 0;
  55     }
  56
  57   __libc_lock_unlock (lock);
  58
  59   return NSS_STATUS_SUCCESS;
  60 }
  61
  62 enum nss_status
  63 _nss_nis_endgrent (void)
  64 {
  65   __libc_lock_lock (lock);
  66
  67   new_start = 1;
  68   if (oldkey != NULL)
  69     {
  70       free (oldkey);
  71       oldkey = NULL;
  72       oldkeylen = 0;
  73     }
  74
  75   __libc_lock_unlock (lock);
  76
  77   return NSS_STATUS_SUCCESS;
  78 }
  79
  80 static enum nss_status
  81 internal_nis_getgrent_r (struct group *grp, char *buffer, size_t buflen)
  82 {
  83   struct parser_data *data = (void *) buffer;
  84   char *domain, *result, *outkey;
  85   int len, keylen, parse_res;
  86
  87   if (yp_get_default_domain (&domain))
  88     return NSS_STATUS_UNAVAIL;
  89
  90   /* Get the next entry until we found a correct one. */
  91   do
  92     {
  93       enum nss_status retval;
  94       char *p;
  95
  96       if (new_start)
  97         retval = yperr2nss (yp_first (domain, "group.byname",
  98                                       &outkey, &keylen, &result, &len));
  99       else
 100         retval = yperr2nss ( yp_next (domain, "group.byname",
 101                                       oldkey, oldkeylen,
 102                                       &outkey, &keylen, &result, &len));
 103
 104       if (retval != NSS_STATUS_SUCCESS)
 105         {
 106           if (retval == NSS_STATUS_TRYAGAIN)
 107             __set_errno (EAGAIN);
 108           return retval;
 109         }
 110
 111       if ((size_t) (len + 1) > buflen)
 112         {
 113           free (result);
 114           __set_errno (ERANGE);
 115           return NSS_STATUS_TRYAGAIN;
 116         }
 117
 118       p = strncpy (buffer, result, len);
 119       buffer[len] = '\0';
 120       while (isspace (*p))
 121         ++p;
 122       free (result);
 123
 124       parse_res = _nss_files_parse_grent (p, grp, data, buflen);
 125       if (parse_res < 1 && errno == ERANGE)
 126         return NSS_STATUS_TRYAGAIN;
 127
 128       free (oldkey);
 129       oldkey = outkey;
 130       oldkeylen = keylen;
 131       new_start = 0;
 132     }
 133   while (parse_res < 1);
 134
 135   return NSS_STATUS_SUCCESS;
 136 }
 137
 138 enum nss_status
 139 _nss_nis_getgrent_r (struct group *result, char *buffer, size_t buflen)
 140 {
 141   int status;
 142
 143   __libc_lock_lock (lock);
 144
 145   status = internal_nis_getgrent_r (result, buffer, buflen);
 146
 147   __libc_lock_unlock (lock);
 148
 149   return status;
 150 }
 151
 152 enum nss_status
 153 _nss_nis_getgrnam_r (const char *name, struct group *grp,
 154                      char *buffer, size_t buflen)
 155 {
 156   struct parser_data *data = (void *) buffer;
 157   enum nss_status retval;
 158   char *domain, *result, *p;
 159   int len, parse_res;
 160
 161   if (name == NULL)
 162     {
 163       __set_errno (EINVAL);
 164       return NSS_STATUS_UNAVAIL;
 165     }
 166
 167   if (yp_get_default_domain (&domain))
 168     return NSS_STATUS_UNAVAIL;
 169
 170   retval = yperr2nss (yp_match (domain, "group.byname", name,
 171                                 strlen (name), &result, &len));
 172
 173   if (retval != NSS_STATUS_SUCCESS)
 174     {
 175       if (retval == NSS_STATUS_TRYAGAIN)
 176         __set_errno (EAGAIN);
 177       return retval;
 178     }
 179
 180   if ((size_t) (len + 1) > buflen)
 181     {
 182       free (result);
 183       __set_errno (ERANGE);
 184       return NSS_STATUS_TRYAGAIN;
 185     }
 186
 187   p = strncpy (buffer, result, len);
 188   buffer[len] = '\0';
 189   while (isspace (*p))
 190     ++p;
 191   free (result);
 192
 193   parse_res = _nss_files_parse_grent (p, grp, data, buflen);
 194
 195   if (parse_res < 1)
 196     {
 197       if (errno == ERANGE)
 198         return NSS_STATUS_TRYAGAIN;
 199       else
 200         return NSS_STATUS_NOTFOUND;
 201     }
 202   else
 203     return NSS_STATUS_SUCCESS;
 204 }
 205
 206 enum nss_status
 207 _nss_nis_getgrgid_r (gid_t gid, struct group *grp,
 208                      char *buffer, size_t buflen)
 209 {
 210   struct parser_data *data = (void *) buffer;
 211   enum nss_status retval;
 212   char *domain, *result, *p;
 213   int len, nlen, parse_res;
 214   char buf[32];
 215
 216   if (yp_get_default_domain (&domain))
 217     return NSS_STATUS_UNAVAIL;
 218
 219   nlen = sprintf (buf, "%d", gid);
 220
 221   retval = yperr2nss (yp_match (domain, "group.bygid", buf,
 222                                 nlen, &result, &len));
 223
 224   if (retval != NSS_STATUS_SUCCESS)
 225     {
 226       if (retval == NSS_STATUS_TRYAGAIN)
 227         __set_errno (EAGAIN);
 228       return retval;
 229     }
 230
 231   if ((size_t) (len + 1) > buflen)
 232     {
 233       free (result);
 234       __set_errno (ERANGE);
 235       return NSS_STATUS_TRYAGAIN;
 236     }
 237
 238   p = strncpy (buffer, result, len);
 239   buffer[len] = '\0';
 240   while (isspace (*p))
 241     ++p;
 242   free (result);
 243
 244   parse_res = _nss_files_parse_grent (p, grp, data, buflen);
 245
 246   if (parse_res < 1)
 247     {
 248       if (errno == ERANGE)
 249         return NSS_STATUS_TRYAGAIN;
 250       else
 251         return NSS_STATUS_NOTFOUND;
 252     }
 253   else
 254     return NSS_STATUS_SUCCESS;
 255 }