1 /* 2 * Copyright (c) 1999 - 2000 Kungliga Tekniska H�gskolan 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: expand_hostname.c,v 1.5 2000/01/08 08:07:18 assar Exp $"); 37 38 static krb5_error_code 39 copy_hostname(krb5_context context, 40 const char *orig_hostname, 41 char **new_hostname) 42 { 43 *new_hostname = strdup (orig_hostname); 44 if (*new_hostname == NULL) 45 return ENOMEM; 46 return 0; 47 } 48 49 /* 50 * Try to make `orig_hostname' into a more canonical one in the newly 51 * allocated space returned in `new_hostname'. 52 */ 53 54 krb5_error_code 55 krb5_expand_hostname (krb5_context context, 56 const char *orig_hostname, 57 char **new_hostname) 58 { 59 struct addrinfo *ai, *a, hints; 60 int error; 61 62 memset (&hints, 0, sizeof(hints)); 63 hints.ai_flags = AI_CANONNAME; 64 65 error = getaddrinfo (orig_hostname, NULL, &hints, &ai); 66 if (error) 67 return copy_hostname (context, orig_hostname, new_hostname); 68 for (a = ai; a != NULL; a = a->ai_next) { 69 if (a->ai_canonname != NULL) { 70 *new_hostname = strdup (a->ai_canonname); 71 freeaddrinfo (ai); 72 if (*new_hostname == NULL) 73 return ENOMEM; 74 else 75 return 0; 76 } 77 } 78 freeaddrinfo (ai); 79 return copy_hostname (context, orig_hostname, new_hostname); 80 } 81