source/heimdal/lib/krb5/set_default_realm.c

   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 RCSID("$Id: set_default_realm.c,v 1.14 2004/05/25 21:42:26 lha Exp $");
  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_string (context, "malloc: out of memory");
  50         return ENOMEM;
  51     }
  52     (*list)[0] = strdup (s);
  53     if ((*list)[0] == NULL) {
  54         free (*list);
  55         krb5_set_error_string (context, "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
  68 krb5_error_code KRB5_LIB_FUNCTION
  69 krb5_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 }