diff options
Diffstat (limited to 'crypto/heimdal/lib/krb5/expand_hostname.c')
-rw-r--r-- | crypto/heimdal/lib/krb5/expand_hostname.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/crypto/heimdal/lib/krb5/expand_hostname.c b/crypto/heimdal/lib/krb5/expand_hostname.c new file mode 100644 index 0000000..698b300 --- /dev/null +++ b/crypto/heimdal/lib/krb5/expand_hostname.c @@ -0,0 +1,80 @@ +/* + * Copyright (c) 1999 - 2000 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: expand_hostname.c,v 1.5 2000/01/08 08:07:18 assar Exp $"); + +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 ENOMEM; + 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_expand_hostname (krb5_context context, + const char *orig_hostname, + char **new_hostname) +{ + struct addrinfo *ai, *a, hints; + int error; + + 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 ENOMEM; + else + return 0; + } + } + freeaddrinfo (ai); + return copy_hostname (context, orig_hostname, new_hostname); +} |