diff options
Diffstat (limited to 'third_party/heimdal/lib/krb5/expand_hostname.c')
| -rw-r--r-- | third_party/heimdal/lib/krb5/expand_hostname.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/third_party/heimdal/lib/krb5/expand_hostname.c b/third_party/heimdal/lib/krb5/expand_hostname.c new file mode 100644 index 0000000..5023d16 --- /dev/null +++ b/third_party/heimdal/lib/krb5/expand_hostname.c @@ -0,0 +1,177 @@ +/* + * Copyright (c) 1999 - 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" + +static krb5_error_code +copy_hostname(krb5_context context, + const char *orig_hostname, + char **new_hostname) +{ + *new_hostname = strdup (orig_hostname); + if (*new_hostname == NULL) + return krb5_enomem(context); + strlwr (*new_hostname); + return 0; +} + +/** + * krb5_expand_hostname() tries to make orig_hostname into a more + * canonical one in the newly allocated space returned in + * new_hostname. + + * @param context a Keberos context + * @param orig_hostname hostname to canonicalise. + * @param new_hostname output hostname, caller must free hostname with + * krb5_xfree(). + * + * @return Return an error code or 0, see krb5_get_error_message(). + * + * @ingroup krb5_support + */ + +KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL +krb5_expand_hostname (krb5_context context, + const char *orig_hostname, + char **new_hostname) +{ + struct addrinfo *ai, *a, hints; + int error; + + if ((context->flags & KRB5_CTX_F_DNS_CANONICALIZE_HOSTNAME) == 0) + return copy_hostname (context, orig_hostname, new_hostname); + + memset (&hints, 0, sizeof(hints)); + hints.ai_flags = AI_CANONNAME; + + error = getaddrinfo (orig_hostname, NULL, &hints, &ai); + if (error) + return copy_hostname (context, orig_hostname, new_hostname); + for (a = ai; a != NULL; a = a->ai_next) { + if (a->ai_canonname != NULL) { + *new_hostname = strdup (a->ai_canonname); + freeaddrinfo (ai); + if (*new_hostname == NULL) + return krb5_enomem(context); + else + return 0; + } + } + freeaddrinfo (ai); + return copy_hostname (context, orig_hostname, new_hostname); +} + +/* + * handle the case of the hostname being unresolvable and thus identical + */ + +static krb5_error_code +vanilla_hostname (krb5_context context, + const char *orig_hostname, + char **new_hostname, + char ***realms) +{ + krb5_error_code ret; + + ret = copy_hostname (context, orig_hostname, new_hostname); + if (ret) + return ret; + strlwr (*new_hostname); + + ret = krb5_get_host_realm (context, *new_hostname, realms); + if (ret) { + free (*new_hostname); + return ret; + } + return 0; +} + +/** + * krb5_expand_hostname_realms() expands orig_hostname to a name we + * believe to be a hostname in newly allocated space in new_hostname + * and return the realms new_hostname is believed to belong to in + * realms. + * + * @param context a Keberos context + * @param orig_hostname hostname to canonicalise. + * @param new_hostname output hostname, caller must free hostname with + * krb5_xfree(). + * @param realms output possible realms, is an array that is terminated + * with NULL. Caller must free with krb5_free_host_realm(). + * + * @return Return an error code or 0, see krb5_get_error_message(). + * + * @ingroup krb5_support + */ + +KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL +krb5_expand_hostname_realms (krb5_context context, + const char *orig_hostname, + char **new_hostname, + char ***realms) +{ + struct addrinfo *ai, *a, hints; + int error; + krb5_error_code ret = 0; + + if ((context->flags & KRB5_CTX_F_DNS_CANONICALIZE_HOSTNAME) == 0) + return vanilla_hostname (context, orig_hostname, new_hostname, + realms); + + memset (&hints, 0, sizeof(hints)); + hints.ai_flags = AI_CANONNAME; + + error = getaddrinfo (orig_hostname, NULL, &hints, &ai); + if (error) + return vanilla_hostname (context, orig_hostname, new_hostname, + realms); + + for (a = ai; a != NULL; a = a->ai_next) { + if (a->ai_canonname != NULL) { + ret = copy_hostname (context, a->ai_canonname, new_hostname); + if (ret) { + freeaddrinfo (ai); + return ret; + } + strlwr (*new_hostname); + ret = krb5_get_host_realm (context, *new_hostname, realms); + if (ret == 0) { + freeaddrinfo (ai); + return 0; + } + free (*new_hostname); + } + } + freeaddrinfo(ai); + return vanilla_hostname (context, orig_hostname, new_hostname, realms); +} |