1/* Check if two domain names are equal after trailing dot normalization.
2 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (c) 1995,1999 by Internet Software Consortium.
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
10 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
11 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
12 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
13 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
14 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
15 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
16 * SOFTWARE.
17 */
18
19#include <arpa/nameser.h>
20#include <string.h>
21
22/* Determines whether domain name A is the same as domain name B.
23 Returns -1 on error, 0 if names differ, 1 if names are the
24 same. */
25int
26__libc_ns_samename (const char *a, const char *b)
27{
28 char ta[NS_MAXDNAME], tb[NS_MAXDNAME];
29
30 if (__libc_ns_makecanon (a, ta, sizeof ta) < 0 ||
31 __libc_ns_makecanon (b, tb, sizeof tb) < 0)
32 return -1;
33 if (__strcasecmp (ta, tb) == 0)
34 return 1;
35 else
36 return 0;
37}
38libc_hidden_def (__libc_ns_samename)
39