nis/nss_nis/nis-netgrp.c

   1 /* Copyright (C) 1996,1997,1999,2000,2002,2003,2004,2005,2006
   2    Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Thorsten Kukuk <kukuk@suse.de>, 1996.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <assert.h>
  21 #include <ctype.h>
  22 #include <errno.h>
  23 #include <malloc.h>
  24 #include <netdb.h>
  25 #include <nss.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <netgroup.h>
  30 #include <rpcsvc/yp.h>
  31 #include <rpcsvc/ypclnt.h>
  32
  33 #include "nss-nis.h"
  34
  35 extern enum nss_status
  36 _nss_netgroup_parseline (char **cursor, struct __netgrent *netgrp,
  37                          char *buffer, size_t buflen, int *errnop);
  38
  39
  40 static void
  41 internal_nis_endnetgrent (struct __netgrent *netgrp)
  42 {
  43   free (netgrp->data);
  44   netgrp->data = NULL;
  45   netgrp->data_size = 0;
  46   netgrp->cursor = NULL;
  47 }
  48
  49
  50 enum nss_status
  51 _nss_nis_setnetgrent (const char *group, struct __netgrent *netgrp)
  52 {
  53   int len;
  54   enum nss_status status;
  55
  56   status = NSS_STATUS_SUCCESS;
  57
  58   if (__builtin_expect (group == NULL || group[0] == '\0', 0))
  59     return NSS_STATUS_UNAVAIL;
  60
  61   char *domain;
  62   if (__builtin_expect (yp_get_default_domain (&domain), 0))
  63     return NSS_STATUS_UNAVAIL;
  64
  65   status = yperr2nss (yp_match (domain, "netgroup", group, strlen (group),
  66                                 &netgrp->data, &len));
  67   if (__builtin_expect (status == NSS_STATUS_SUCCESS, 1))
  68     {
  69       /* Our implementation of yp_match already allocates a buffer
  70          which is one byte larger than the value in LEN specifies
  71          and the last byte is filled with NUL.  So we can simply
  72          use that buffer.  */
  73       assert (len >= 0);
  74       assert (malloc_usable_size (netgrp->data) >= len + 1);
  75       assert (netgrp->data[len] == '\0');
  76
  77       netgrp->data_size = len;
  78       netgrp->cursor = netgrp->data;
  79     }
  80
  81   return status;
  82 }
  83
  84
  85 enum nss_status
  86 _nss_nis_endnetgrent (struct __netgrent *netgrp)
  87 {
  88   internal_nis_endnetgrent (netgrp);
  89
  90   return NSS_STATUS_SUCCESS;
  91 }
  92
  93
  94 enum nss_status
  95 _nss_nis_getnetgrent_r (struct __netgrent *result, char *buffer, size_t buflen,
  96                         int *errnop)
  97 {
  98   return _nss_netgroup_parseline (&result->cursor, result, buffer, buflen,
  99                                   errnop);
 100 }