/*
 * Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
 * (Royal Institute of Technology, Stockholm, Sweden). 
 * All rights reserved. 
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met: 
 *
 * 1. Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. 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. 
 *
 * 3. Neither the name of the Institute 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 INSTITUTE 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 INSTITUTE 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. 
 */

#include "krb5_locl.h"

RCSID("$Id: set_default_realm.c 13863 2004-05-25 21:46:46Z lha $");

/*
 * Convert the simple string `s' into a NULL-terminated and freshly allocated 
 * list in `list'.  Return an error code.
 */

static krb5_error_code
string_to_list (krb5_context context, const char *s, krb5_realm **list)
{

    *list = malloc (2 * sizeof(**list));
    if (*list == NULL) {
	krb5_set_error_string (context, "malloc: out of memory");
	return ENOMEM;
    }
    (*list)[0] = strdup (s);
    if ((*list)[0] == NULL) {
	free (*list);
	krb5_set_error_string (context, "malloc: out of memory");
	return ENOMEM;
    }
    (*list)[1] = NULL;
    return 0;
}

/*
 * Set the knowledge of the default realm(s) in `context'.
 * If realm != NULL, that's the new default realm.
 * Otherwise, the realm(s) are figured out from configuration or DNS.  
 */

krb5_error_code KRB5_LIB_FUNCTION
krb5_set_default_realm(krb5_context context,
		       const char *realm)
{
    krb5_error_code ret = 0;
    krb5_realm *realms = NULL;

    if (realm == NULL) {
	realms = krb5_config_get_strings (context, NULL,
					  "libdefaults",
					  "default_realm",
					  NULL);
	if (realms == NULL)
	    ret = krb5_get_host_realm(context, NULL, &realms);
    } else {
	ret = string_to_list (context, realm, &realms);
    }
    if (ret)
	return ret;
    krb5_free_host_realm (context, context->default_realms);
    context->default_realms = realms;
    return 0;
}