154 lines
4.5 KiB
C
154 lines
4.5 KiB
C
/*
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* Copyright (c) 1999 - 2001 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "krb5_locl.h"
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RCSID("$Id: expand_hostname.c,v 1.11 2001/09/18 09:35:47 joda Exp $");
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static krb5_error_code
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copy_hostname(krb5_context context,
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const char *orig_hostname,
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char **new_hostname)
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{
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*new_hostname = strdup (orig_hostname);
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if (*new_hostname == NULL) {
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krb5_set_error_string(context, "malloc: out of memory");
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return ENOMEM;
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}
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strlwr (*new_hostname);
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return 0;
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}
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/*
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* Try to make `orig_hostname' into a more canonical one in the newly
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* allocated space returned in `new_hostname'.
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*/
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krb5_error_code
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krb5_expand_hostname (krb5_context context,
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const char *orig_hostname,
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char **new_hostname)
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{
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struct addrinfo *ai, *a, hints;
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int error;
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memset (&hints, 0, sizeof(hints));
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hints.ai_flags = AI_CANONNAME;
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error = getaddrinfo (orig_hostname, NULL, &hints, &ai);
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if (error)
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return copy_hostname (context, orig_hostname, new_hostname);
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for (a = ai; a != NULL; a = a->ai_next) {
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if (a->ai_canonname != NULL) {
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*new_hostname = strdup (a->ai_canonname);
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freeaddrinfo (ai);
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if (*new_hostname == NULL) {
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krb5_set_error_string(context, "malloc: out of memory");
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return ENOMEM;
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} else {
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return 0;
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}
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}
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}
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freeaddrinfo (ai);
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return copy_hostname (context, orig_hostname, new_hostname);
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}
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/*
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* handle the case of the hostname being unresolvable and thus identical
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*/
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static krb5_error_code
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vanilla_hostname (krb5_context context,
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const char *orig_hostname,
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char **new_hostname,
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char ***realms)
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{
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krb5_error_code ret;
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ret = copy_hostname (context, orig_hostname, new_hostname);
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if (ret)
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return ret;
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strlwr (*new_hostname);
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ret = krb5_get_host_realm (context, *new_hostname, realms);
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if (ret) {
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free (*new_hostname);
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return ret;
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}
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return 0;
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}
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/*
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* expand `hostname' to a name we believe to be a hostname in newly
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* allocated space in `host' and return realms in `realms'.
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*/
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krb5_error_code
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krb5_expand_hostname_realms (krb5_context context,
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const char *orig_hostname,
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char **new_hostname,
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char ***realms)
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{
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struct addrinfo *ai, *a, hints;
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int error;
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krb5_error_code ret = 0;
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memset (&hints, 0, sizeof(hints));
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hints.ai_flags = AI_CANONNAME;
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error = getaddrinfo (orig_hostname, NULL, &hints, &ai);
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if (error)
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return vanilla_hostname (context, orig_hostname, new_hostname,
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realms);
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for (a = ai; a != NULL; a = a->ai_next) {
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if (a->ai_canonname != NULL) {
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ret = copy_hostname (context, a->ai_canonname, new_hostname);
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if (ret) {
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freeaddrinfo (ai);
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return ret;
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}
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strlwr (*new_hostname);
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ret = krb5_get_host_realm (context, *new_hostname, realms);
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if (ret == 0) {
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freeaddrinfo (ai);
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return 0;
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}
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free (*new_hostname);
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}
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}
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freeaddrinfo(ai);
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return vanilla_hostname (context, orig_hostname, new_hostname, realms);
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}
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