nss/nss_db/db-netgrp.c

   1 /* Netgroup file parser in nss_db modules.
   2 Copyright (C) 1996 Free Software Foundation, Inc.
   3 This file is part of the GNU C Library.
   4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 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 Library General Public License as
   8 published by the Free Software Foundation; either version 2 of the
   9 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 Library General Public License for more details.
  15
  16 You should have received a copy of the GNU Library General Public
  17 License along with the GNU C Library; see the file COPYING.LIB.  If
  18 not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 #include <db.h>
  22 #include <errno.h>
  23 #include <fcntl.h>
  24 #include <libc-lock.h>
  25 #include <paths.h>
  26 #include "nsswitch.h"
  27 #include "netgroup.h"
  28
  29
  30 #define DBFILE          _PATH_VARDB "netgroup.db"
  31
  32
  33 /* Locks the static variables in this file.  */
  34 __libc_lock_define_initialized (static, lock)
  35 \f
  36 /* Maintenance of the shared handle open on the database.  */
  37 static DB *db;
  38 static char *entry;
  39 static char *cursor;
  40
  41 enum nss_status
  42 _nss_db_setnetgrent (const char *group)
  43 {
  44   enum nss_status status = NSS_STATUS_SUCCESS;
  45
  46   __libc_lock_lock (lock);
  47
  48   /* Make sure the data base file is open.  */
  49   if (db == NULL)
  50     {
  51       db = dbopen (DBFILE, O_RDONLY, 0, DB_BTREE, NULL);
  52
  53       if (db == NULL)
  54         status = errno = EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
  55     }
  56
  57   if (status == NSS_STATUS_SUCCESS)
  58     {
  59       DBT key = { data: (void *) group, size: strlen (group) };
  60       DBT value;
  61
  62       if ((*db->get) (db, &key, &value, 0) != 0)
  63         status = NSS_STATUS_NOTFOUND;
  64       else
  65         cursor = entry = value.data;
  66     }
  67
  68   __libc_lock_unlock (lock);
  69
  70   return status;
  71
  72 }
  73
  74
  75 enum nss_status
  76 _nss_db_endnetgrent (void)
  77 {
  78   __libc_lock_lock (lock);
  79
  80   if (db != NULL)
  81     {
  82       (*db->close) (db);
  83       db = NULL;
  84     }
  85
  86   __libc_lock_unlock (lock);
  87
  88   return NSS_STATUS_SUCCESS;
  89 }
  90
  91
  92 extern enum nss_status _nss_netgroup_parseline (char **cursor,
  93                                                 struct __netgrent *result,
  94                                                 char *buffer, int buflen);
  95
  96 enum nss_status
  97 _nss_db_getnetgrent_r (struct __netgrent *result, char *buffer, int buflen)
  98 {
  99   int status;
 100
 101   __libc_lock_lock (lock);
 102
 103   status = _nss_netgroup_parseline (&cursor, result, buffer, buflen);
 104
 105   __libc_lock_unlock (lock);
 106
 107   return status;
 108 }