nis/nss_nis/nis-netgrp.c

   1 /* Copyright (C) 1996-2014 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, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <assert.h>
  20 #include <ctype.h>
  21 #include <errno.h>
  22 #include <malloc.h>
  23 #include <netdb.h>
  24 #include <nss.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <netgroup.h>
  29 #include <rpcsvc/yp.h>
  30 #include <rpcsvc/ypclnt.h>
  31
  32 #include "nss-nis.h"
  33
  34 extern enum nss_status
  35 _nss_netgroup_parseline (char **cursor, struct __netgrent *netgrp,
  36                          char *buffer, size_t buflen, int *errnop);
  37
  38
  39 static void
  40 internal_nis_endnetgrent (struct __netgrent *netgrp)
  41 {
  42   free (netgrp->data);
  43   netgrp->data = NULL;
  44   netgrp->data_size = 0;
  45   netgrp->cursor = NULL;
  46 }
  47
  48
  49 enum nss_status
  50 _nss_nis_setnetgrent (const char *group, struct __netgrent *netgrp)
  51 {
  52   int len;
  53   enum nss_status status;
  54
  55   status = NSS_STATUS_SUCCESS;
  56
  57   if (__builtin_expect (group == NULL || group[0] == '\0', 0))
  58     return NSS_STATUS_UNAVAIL;
  59
  60   char *domain;
  61   if (__builtin_expect (yp_get_default_domain (&domain), 0))
  62     return NSS_STATUS_UNAVAIL;
  63
  64   status = yperr2nss (yp_match (domain, "netgroup", group, strlen (group),
  65                                 &netgrp->data, &len));
  66   if (__builtin_expect (status == NSS_STATUS_SUCCESS, 1))
  67     {
  68       /* Our implementation of yp_match already allocates a buffer
  69          which is one byte larger than the value in LEN specifies
  70          and the last byte is filled with NUL.  So we can simply
  71          use that buffer.  */
  72       assert (len >= 0);
  73       assert (malloc_usable_size (netgrp->data) >= len + 1);
  74       assert (netgrp->data[len] == '\0');
  75
  76       netgrp->data_size = len;
  77       netgrp->cursor = netgrp->data;
  78     }
  79
  80   return status;
  81 }
  82
  83
  84 enum nss_status
  85 _nss_nis_endnetgrent (struct __netgrent *netgrp)
  86 {
  87   internal_nis_endnetgrent (netgrp);
  88
  89   return NSS_STATUS_SUCCESS;
  90 }
  91
  92
  93 enum nss_status
  94 _nss_nis_getnetgrent_r (struct __netgrent *result, char *buffer, size_t buflen,
  95                         int *errnop)
  96 {
  97   return _nss_netgroup_parseline (&result->cursor, result, buffer, buflen,
  98                                   errnop);
  99 }