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, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <assert.h>
  22 #include <ctype.h>
  23 #include <errno.h>
  24 #include <malloc.h>
  25 #include <netdb.h>
  26 #include <nss.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <netgroup.h>
  31 #include <rpcsvc/yp.h>
  32 #include <rpcsvc/ypclnt.h>
  33
  34 #include "nss-nis.h"
  35
  36 extern enum nss_status
  37 _nss_netgroup_parseline (char **cursor, struct __netgrent *netgrp,
  38                          char *buffer, size_t buflen, int *errnop);
  39
  40
  41 static void
  42 internal_nis_endnetgrent (struct __netgrent *netgrp)
  43 {
  44   free (netgrp->data);
  45   netgrp->data = NULL;
  46   netgrp->data_size = 0;
  47   netgrp->cursor = NULL;
  48 }
  49
  50
  51 enum nss_status
  52 _nss_nis_setnetgrent (const char *group, struct __netgrent *netgrp)
  53 {
  54   int len;
  55   enum nss_status status;
  56
  57   status = NSS_STATUS_SUCCESS;
  58
  59   if (__builtin_expect (group == NULL || group[0] == '\0', 0))
  60     return NSS_STATUS_UNAVAIL;
  61
  62   char *domain;
  63   if (__builtin_expect (yp_get_default_domain (&domain), 0))
  64     return NSS_STATUS_UNAVAIL;
  65
  66   status = yperr2nss (yp_match (domain, "netgroup", group, strlen (group),
  67                                 &netgrp->data, &len));
  68   if (__builtin_expect (status == NSS_STATUS_SUCCESS, 1))
  69     {
  70       /* Our implementation of yp_match already allocates a buffer
  71          which is one byte larger than the value in LEN specifies
  72          and the last byte is filled with NUL.  So we can simply
  73          use that buffer.  */
  74       assert (len >= 0);
  75       assert (malloc_usable_size (netgrp->data) >= len + 1);
  76       assert (netgrp->data[len] == '\0');
  77
  78       netgrp->data_size = len;
  79       netgrp->cursor = netgrp->data;
  80     }
  81
  82   return status;
  83 }
  84
  85
  86 enum nss_status
  87 _nss_nis_endnetgrent (struct __netgrent *netgrp)
  88 {
  89   internal_nis_endnetgrent (netgrp);
  90
  91   return NSS_STATUS_SUCCESS;
  92 }
  93
  94
  95 enum nss_status
  96 _nss_nis_getnetgrent_r (struct __netgrent *result, char *buffer, size_t buflen,
  97                         int *errnop)
  98 {
  99   return _nss_netgroup_parseline (&result->cursor, result, buffer, buflen,
 100                                   errnop);
 101 }