/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 2009, Sun Microsystems, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 * - Redistributions of source code must retain the above copyright notice, 
 *   this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice, 
 *   this list of conditions and the following disclaimer in the documentation 
 *   and/or other materials provided with the distribution.
 * - Neither the name of Sun Microsystems, Inc. nor the names of its 
 *   contributors may be used to endorse or promote products derived 
 *   from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
 * POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * rpcdname.c
 * Gets the default domain name
 */

#include "namespace.h"
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include "un-namespace.h"

static char *default_domain;

static char *
get_default_domain(void)
{
	char temp[256];

	if (default_domain != NULL)
		return (default_domain);
	if (getdomainname(temp, sizeof(temp)) < 0)
		return (0);
	if ((int) strlen(temp) > 0) {
		default_domain = malloc((strlen(temp) + (unsigned)1));
		if (default_domain == NULL)
			return (0);
		(void) strcpy(default_domain, temp);
		return (default_domain);
	}
	return (0);
}

/*
 * This is a wrapper for the system call getdomainname which returns a
 * ypclnt.h error code in the failure case.  It also checks to see that
 * the domain name is non-null, knowing that the null string is going to
 * get rejected elsewhere in the NIS client package.
 */
int
__rpc_get_default_domain(char **domain)
{
	if ((*domain = get_default_domain()) != NULL)
		return (0);
	return (-1);
}