nis/nss_nis/nis-grp.c

   1 /* Copyright (C) 1996,1997,1998,1999,2001,2002 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 #include <grp.h>
  22 #include <ctype.h>
  23 #include <errno.h>
  24 #include <string.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 /* 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;
  42 static int oldkeylen;
  43
  44 enum nss_status
  45 _nss_nis_setgrent (int stayopen)
  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                          int *errnop)
  83 {
  84   struct parser_data *data = (void *) buffer;
  85   char *domain, *result, *outkey;
  86   int len, keylen, parse_res;
  87
  88   if (yp_get_default_domain (&domain))
  89     return NSS_STATUS_UNAVAIL;
  90
  91   /* Get the next entry until we found a correct one. */
  92   do
  93     {
  94       enum nss_status retval;
  95       char *p;
  96
  97       if (new_start)
  98         retval = yperr2nss (yp_first (domain, "group.byname",
  99                                       &outkey, &keylen, &result, &len));
 100       else
 101         retval = yperr2nss ( yp_next (domain, "group.byname",
 102                                       oldkey, oldkeylen,
 103                                       &outkey, &keylen, &result, &len));
 104
 105       if (retval != NSS_STATUS_SUCCESS)
 106         {
 107           if (retval == NSS_STATUS_TRYAGAIN)
 108             *errnop = errno;
 109           return retval;
 110         }
 111
 112       if ((size_t) (len + 1) > buflen)
 113         {
 114           free (result);
 115           *errnop = ERANGE;
 116           return NSS_STATUS_TRYAGAIN;
 117         }
 118
 119       p = strncpy (buffer, result, len);
 120       buffer[len] = '\0';
 121       while (isspace (*p))
 122         ++p;
 123       free (result);
 124
 125       parse_res = _nss_files_parse_grent (p, grp, data, buflen, errnop);
 126       if (parse_res == -1)
 127         {
 128           free (outkey);
 129           *errnop = ERANGE;
 130           return NSS_STATUS_TRYAGAIN;
 131         }
 132
 133       free (oldkey);
 134       oldkey = outkey;
 135       oldkeylen = keylen;
 136       new_start = 0;
 137     }
 138   while (parse_res < 1);
 139
 140   return NSS_STATUS_SUCCESS;
 141 }
 142
 143 enum nss_status
 144 _nss_nis_getgrent_r (struct group *result, char *buffer, size_t buflen,
 145                      int *errnop)
 146 {
 147   int status;
 148
 149   __libc_lock_lock (lock);
 150
 151   status = internal_nis_getgrent_r (result, buffer, buflen, errnop);
 152
 153   __libc_lock_unlock (lock);
 154
 155   return status;
 156 }
 157
 158 enum nss_status
 159 _nss_nis_getgrnam_r (const char *name, struct group *grp,
 160                      char *buffer, size_t buflen, int *errnop)
 161 {
 162   struct parser_data *data = (void *) buffer;
 163   enum nss_status retval;
 164   char *domain, *result, *p;
 165   int len, parse_res;
 166
 167   if (name == NULL)
 168     {
 169       *errnop = EINVAL;
 170       return NSS_STATUS_UNAVAIL;
 171     }
 172
 173   if (yp_get_default_domain (&domain))
 174     return NSS_STATUS_UNAVAIL;
 175
 176   retval = yperr2nss (yp_match (domain, "group.byname", name,
 177                                 strlen (name), &result, &len));
 178
 179   if (retval != NSS_STATUS_SUCCESS)
 180     {
 181       if (retval == NSS_STATUS_NOTFOUND)
 182         *errnop = EAGAIN;
 183       else if (retval == NSS_STATUS_TRYAGAIN)
 184         *errnop = errno;
 185       return retval;
 186     }
 187
 188   if ((size_t) (len + 1) > buflen)
 189     {
 190       free (result);
 191       *errnop = ERANGE;
 192       return NSS_STATUS_TRYAGAIN;
 193     }
 194
 195   p = strncpy (buffer, result, len);
 196   buffer[len] = '\0';
 197   while (isspace (*p))
 198     ++p;
 199   free (result);
 200
 201   parse_res = _nss_files_parse_grent (p, grp, data, buflen, errnop);
 202   if (parse_res < 1)
 203     {
 204       if (parse_res == -1)
 205         return NSS_STATUS_TRYAGAIN;
 206       else
 207         return NSS_STATUS_NOTFOUND;
 208     }
 209   return NSS_STATUS_SUCCESS;
 210 }
 211
 212 enum nss_status
 213 _nss_nis_getgrgid_r (gid_t gid, struct group *grp,
 214                      char *buffer, size_t buflen, int *errnop)
 215 {
 216   struct parser_data *data = (void *) buffer;
 217   enum nss_status retval;
 218   char *domain, *result, *p;
 219   int len, nlen, parse_res;
 220   char buf[32];
 221
 222   if (yp_get_default_domain (&domain))
 223     return NSS_STATUS_UNAVAIL;
 224
 225   nlen = sprintf (buf, "%lu", (unsigned long int) gid);
 226
 227   retval = yperr2nss (yp_match (domain, "group.bygid", buf,
 228                                 nlen, &result, &len));
 229
 230   if (retval != NSS_STATUS_SUCCESS)
 231     {
 232       if (retval == NSS_STATUS_TRYAGAIN)
 233         *errnop = errno;
 234       return retval;
 235     }
 236
 237   if ((size_t) (len + 1) > buflen)
 238     {
 239       free (result);
 240       *errnop = ERANGE;
 241       return NSS_STATUS_TRYAGAIN;
 242     }
 243
 244   p = strncpy (buffer, result, len);
 245   buffer[len] = '\0';
 246   while (isspace (*p))
 247     ++p;
 248   free (result);
 249
 250   parse_res = _nss_files_parse_grent (p, grp, data, buflen, errnop);
 251   if (parse_res < 1)
 252     {
 253       if (parse_res == -1)
 254         return NSS_STATUS_TRYAGAIN;
 255       else
 256         return NSS_STATUS_NOTFOUND;
 257     }
 258   return NSS_STATUS_SUCCESS;
 259 }