1/*
2 * Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include "krb5_locl.h"
35
36/*
37 * Convert the simple string `s' into a NULL-terminated and freshly allocated
38 * list in `list'.  Return an error code.
39 */
40
41static krb5_error_code
42string_to_list (krb5_context context, const char *s, krb5_realm **list)
43{
44
45    *list = malloc (2 * sizeof(**list));
46    if (*list == NULL) {
47	krb5_set_error_message(context, ENOMEM,
48			       N_("malloc: out of memory", ""));
49	return ENOMEM;
50    }
51    (*list)[0] = strdup (s);
52    if ((*list)[0] == NULL) {
53	free (*list);
54	krb5_set_error_message(context, ENOMEM,
55			       N_("malloc: out of memory", ""));
56	return ENOMEM;
57    }
58    (*list)[1] = NULL;
59    return 0;
60}
61
62/*
63 * Set the knowledge of the default realm(s) in `context'.
64 * If realm != NULL, that's the new default realm.
65 * Otherwise, the realm(s) are figured out from configuration or DNS.
66 */
67
68KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
69krb5_set_default_realm(krb5_context context,
70		       const char *realm)
71{
72    krb5_error_code ret = 0;
73    krb5_realm *realms = NULL;
74
75    if (realm == NULL) {
76	realms = krb5_config_get_strings (context, NULL,
77					  "libdefaults",
78					  "default_realm",
79					  NULL);
80	if (realms == NULL)
81	    ret = krb5_get_host_realm(context, NULL, &realms);
82    } else {
83	ret = string_to_list (context, realm, &realms);
84    }
85    if (ret)
86	return ret;
87    krb5_free_host_realm (context, context->default_realms);
88    context->default_realms = realms;
89    return 0;
90}
91