1 /*	$NetBSD: set_default_realm.c,v 1.1.1.1 2011/04/13 18:15:38 elric Exp $	*/
2 
3 /*
4  * Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
5  * (Royal Institute of Technology, Stockholm, Sweden).
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  *
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  *
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  *
19  * 3. Neither the name of the Institute nor the names of its contributors
20  *    may be used to endorse or promote products derived from this software
21  *    without specific prior written permission.
22  *
23  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33  * SUCH DAMAGE.
34  */
35 
36 #include "krb5_locl.h"
37 
38 /*
39  * Convert the simple string `s' into a NULL-terminated and freshly allocated
40  * list in `list'.  Return an error code.
41  */
42 
43 static krb5_error_code
44 string_to_list (krb5_context context, const char *s, krb5_realm **list)
45 {
46 
47     *list = malloc (2 * sizeof(**list));
48     if (*list == NULL) {
49 	krb5_set_error_message(context, ENOMEM,
50 			       N_("malloc: out of memory", ""));
51 	return ENOMEM;
52     }
53     (*list)[0] = strdup (s);
54     if ((*list)[0] == NULL) {
55 	free (*list);
56 	krb5_set_error_message(context, ENOMEM,
57 			       N_("malloc: out of memory", ""));
58 	return ENOMEM;
59     }
60     (*list)[1] = NULL;
61     return 0;
62 }
63 
64 /*
65  * Set the knowledge of the default realm(s) in `context'.
66  * If realm != NULL, that's the new default realm.
67  * Otherwise, the realm(s) are figured out from configuration or DNS.
68  */
69 
70 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
71 krb5_set_default_realm(krb5_context context,
72 		       const char *realm)
73 {
74     krb5_error_code ret = 0;
75     krb5_realm *realms = NULL;
76 
77     if (realm == NULL) {
78 	realms = krb5_config_get_strings (context, NULL,
79 					  "libdefaults",
80 					  "default_realm",
81 					  NULL);
82 	if (realms == NULL)
83 	    ret = krb5_get_host_realm(context, NULL, &realms);
84     } else {
85 	ret = string_to_list (context, realm, &realms);
86     }
87     if (ret)
88 	return ret;
89     krb5_free_host_realm (context, context->default_realms);
90     context->default_realms = realms;
91     return 0;
92 }
93