nis/nss_nis/nis-netgrp.c

   1 /* Copyright (C) 1996,1997,1999,2000,2002,2003,2004
   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   if (netgrp->data != NULL)
  45     {
  46       free (netgrp->data);
  47       netgrp->data = NULL;
  48       netgrp->data_size = 0;
  49       netgrp->cursor = NULL;
  50     }
  51 }
  52
  53 enum nss_status
  54 _nss_nis_setnetgrent (const char *group, struct __netgrent *netgrp)
  55 {
  56   char *domain;
  57   int len;
  58   enum nss_status status;
  59
  60   status = NSS_STATUS_SUCCESS;
  61
  62   if (group == NULL || group[0] == '\0')
  63     return NSS_STATUS_UNAVAIL;
  64
  65   if (yp_get_default_domain (&domain))
  66     return NSS_STATUS_UNAVAIL;
  67
  68   internal_nis_endnetgrent (netgrp);
  69
  70   status = yperr2nss (yp_match (domain, "netgroup", group, strlen (group),
  71                                 &netgrp->data, &len));
  72   if (status == NSS_STATUS_SUCCESS)
  73     {
  74       /* Our implementation of yp_match already allocates a buffer
  75          which is one byte larger than the value in LEN specifies
  76          and the last byte is filled with NUL.  So we can simply
  77          use that buffer.  */
  78       assert (len > 0);
  79       assert (malloc_usable_size (netgrp->data) >= len + 1);
  80       assert (netgrp->data[len] == '\0');
  81
  82       netgrp->data_size = len;
  83       netgrp->cursor = netgrp->data;
  84     }
  85
  86   return status;
  87 }
  88
  89
  90 enum nss_status
  91 _nss_nis_endnetgrent (struct __netgrent *netgrp)
  92 {
  93   internal_nis_endnetgrent (netgrp);
  94
  95   return NSS_STATUS_SUCCESS;
  96 }
  97
  98 enum nss_status
  99 _nss_nis_getnetgrent_r (struct __netgrent *result, char *buffer, size_t buflen,
 100                         int *errnop)
 101 {
 102   if (result->cursor == NULL)
 103     return NSS_STATUS_NOTFOUND;
 104
 105   return _nss_netgroup_parseline (&result->cursor, result, buffer, buflen,
 106                                   errnop);
 107 }