diff options
Diffstat (limited to 'source4/heimdal/lib/krb5/expand_hostname.c')
| -rw-r--r-- | source4/heimdal/lib/krb5/expand_hostname.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/source4/heimdal/lib/krb5/expand_hostname.c b/source4/heimdal/lib/krb5/expand_hostname.c new file mode 100644 index 0000000000..4ada4b8110 --- /dev/null +++ b/source4/heimdal/lib/krb5/expand_hostname.c @@ -0,0 +1,161 @@ +/* + * 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" + +RCSID("$Id$"); + +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) { + krb5_set_error_message(context, ENOMEM, "malloc: out of memory"); + return ENOMEM; + } + strlwr (*new_hostname); + return 0; +} + +/* + * Try to make `orig_hostname' into a more canonical one in the newly + * allocated space returned in `new_hostname'. + */ + +krb5_error_code KRB5_LIB_FUNCTION +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) { + krb5_set_error_message(context, ENOMEM, + "malloc: out of memory"); + return ENOMEM; + } 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; +} + +/* + * expand `hostname' to a name we believe to be a hostname in newly + * allocated space in `host' and return realms in `realms'. + */ + +krb5_error_code KRB5_LIB_FUNCTION +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); +} |