1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22
23/*
24 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
25 * Use is subject to license terms.
26 */
27/* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
28/* All Rights Reserved */
29/*
30 * Portions of this source code were derived from Berkeley
31 * 4.3 BSD under license from the Regents of the University of
32 * California.
33 */
34
35#pragma ident	"%Z%%M%	%I%	%E% SMI"
36
37/*
38 * rpcdname.c
39 * Gets the default domain name
40 */
41#include "mt.h"
42#include "rpc_mt.h"
43#include <sys/types.h>
44#include <sys/time.h>
45#include <string.h>
46#include <syslog.h>
47
48extern int getdomainname();
49extern char *strdup();
50static char *default_domain = 0;
51
52static char *
53get_default_domain(void)
54{
55	char temp[256];
56	extern mutex_t dname_lock;
57
58/* VARIABLES PROTECTED BY dname_lock: default_domain */
59
60	(void) mutex_lock(&dname_lock);
61	if (default_domain) {
62		(void) mutex_unlock(&dname_lock);
63		return (default_domain);
64	}
65	if (getdomainname(temp, (size_t)sizeof (temp)) < 0) {
66		(void) mutex_unlock(&dname_lock);
67		return (0);
68	}
69	if ((int)strlen(temp) > 0) {
70		default_domain = strdup(temp);
71		if (default_domain == NULL) {
72			syslog(LOG_ERR, "get_default_domain : strdup failed.");
73			(void) mutex_unlock(&dname_lock);
74			return (0);
75		}
76	}
77	(void) mutex_unlock(&dname_lock);
78	return (default_domain);
79}
80
81/*
82 * This is a wrapper for the system call getdomainname which returns a
83 * ypclnt.h error code in the failure case.  It also checks to see that
84 * the domain name is non-null, knowing that the null string is going to
85 * get rejected elsewhere in the yp client package.
86 */
87int
88__rpc_get_default_domain(char **domain)
89{
90	if ((*domain = get_default_domain()) != 0)
91		return (0);
92	return (-1);
93}
94