nis/nss_nis/nis-grp.c

   1 /* Copyright (C) 1996, 1997, 1998 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 <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 = 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                          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_NOTFOUND)
 108             *errnop = ENOENT;
 109           else if (retval == NSS_STATUS_TRYAGAIN)
 110             *errnop = errno;
 111           return retval;
 112         }
 113
 114       if ((size_t) (len + 1) > buflen)
 115         {
 116           free (result);
 117           *errnop = ERANGE;
 118           return NSS_STATUS_TRYAGAIN;
 119         }
 120
 121       p = strncpy (buffer, result, len);
 122       buffer[len] = '\0';
 123       while (isspace (*p))
 124         ++p;
 125       free (result);
 126
 127       parse_res = _nss_files_parse_grent (p, grp, data, buflen, errnop);
 128       if (parse_res == -1)
 129         {
 130           free (outkey);
 131           *errnop = ERANGE;
 132           return NSS_STATUS_TRYAGAIN;
 133         }
 134
 135       free (oldkey);
 136       oldkey = outkey;
 137       oldkeylen = keylen;
 138       new_start = 0;
 139     }
 140   while (parse_res < 1);
 141
 142   return NSS_STATUS_SUCCESS;
 143 }
 144
 145 enum nss_status
 146 _nss_nis_getgrent_r (struct group *result, char *buffer, size_t buflen,
 147                      int *errnop)
 148 {
 149   int status;
 150
 151   __libc_lock_lock (lock);
 152
 153   status = internal_nis_getgrent_r (result, buffer, buflen, errnop);
 154
 155   __libc_lock_unlock (lock);
 156
 157   return status;
 158 }
 159
 160 enum nss_status
 161 _nss_nis_getgrnam_r (const char *name, struct group *grp,
 162                      char *buffer, size_t buflen, int *errnop)
 163 {
 164   struct parser_data *data = (void *) buffer;
 165   enum nss_status retval;
 166   char *domain, *result, *p;
 167   int len, parse_res;
 168
 169   if (name == NULL)
 170     {
 171       *errnop = EINVAL;
 172       return NSS_STATUS_UNAVAIL;
 173     }
 174
 175   if (yp_get_default_domain (&domain))
 176     return NSS_STATUS_UNAVAIL;
 177
 178   retval = yperr2nss (yp_match (domain, "group.byname", name,
 179                                 strlen (name), &result, &len));
 180
 181   if (retval != NSS_STATUS_SUCCESS)
 182     {
 183       if (retval == NSS_STATUS_NOTFOUND)
 184         *errnop = EAGAIN;
 185       else if (retval == NSS_STATUS_TRYAGAIN)
 186         *errnop = errno;
 187       return retval;
 188     }
 189
 190   if ((size_t) (len + 1) > buflen)
 191     {
 192       free (result);
 193       *errnop = ERANGE;
 194       return NSS_STATUS_TRYAGAIN;
 195     }
 196
 197   p = strncpy (buffer, result, len);
 198   buffer[len] = '\0';
 199   while (isspace (*p))
 200     ++p;
 201   free (result);
 202
 203   parse_res = _nss_files_parse_grent (p, grp, data, buflen, errnop);
 204   if (parse_res < 1)
 205     {
 206       if (parse_res == -1)
 207         return NSS_STATUS_TRYAGAIN;
 208       else
 209         {
 210           *errnop = EAGAIN;
 211           return NSS_STATUS_NOTFOUND;
 212         }
 213     }
 214   return NSS_STATUS_SUCCESS;
 215 }
 216
 217 enum nss_status
 218 _nss_nis_getgrgid_r (gid_t gid, struct group *grp,
 219                      char *buffer, size_t buflen, int *errnop)
 220 {
 221   struct parser_data *data = (void *) buffer;
 222   enum nss_status retval;
 223   char *domain, *result, *p;
 224   int len, nlen, parse_res;
 225   char buf[32];
 226
 227   if (yp_get_default_domain (&domain))
 228     return NSS_STATUS_UNAVAIL;
 229
 230   nlen = sprintf (buf, "%d", gid);
 231
 232   retval = yperr2nss (yp_match (domain, "group.bygid", buf,
 233                                 nlen, &result, &len));
 234
 235   if (retval != NSS_STATUS_SUCCESS)
 236     {
 237       if (retval == NSS_STATUS_NOTFOUND)
 238         *errnop = ENOENT;
 239       else if (retval == NSS_STATUS_TRYAGAIN)
 240         *errnop = errno;
 241       return retval;
 242     }
 243
 244   if ((size_t) (len + 1) > buflen)
 245     {
 246       free (result);
 247       *errnop = ERANGE;
 248       return NSS_STATUS_TRYAGAIN;
 249     }
 250
 251   p = strncpy (buffer, result, len);
 252   buffer[len] = '\0';
 253   while (isspace (*p))
 254     ++p;
 255   free (result);
 256
 257   parse_res = _nss_files_parse_grent (p, grp, data, buflen, errnop);
 258   if (parse_res < 1)
 259     {
 260       if (parse_res == -1)
 261         return NSS_STATUS_TRYAGAIN;
 262       else
 263         {
 264           *errnop = ENOENT;
 265           return NSS_STATUS_NOTFOUND;
 266         }
 267     }
 268   return NSS_STATUS_SUCCESS;
 269 }