/contrib/bind9/lib/export/samples/sample-gai.c

 1/*
 2 * Copyright (C) 2009  Internet Systems Consortium, Inc. ("ISC")
 3 *
 4 * Permission to use, copy, modify, and/or distribute this software for any
 5 * purpose with or without fee is hereby granted, provided that the above
 6 * copyright notice and this permission notice appear in all copies.
 7 *
 8 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
 9 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
10 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
11 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
12 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
13 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
14 * PERFORMANCE OF THIS SOFTWARE.
15 */
16
17/* $Id: sample-gai.c,v 1.4 2009/09/02 23:48:02 tbox Exp $ */
18
19#include <config.h>
20
21#include <sys/types.h>
22#include <sys/socket.h>
23
24#include <irs/netdb.h>
25
26#include <stdlib.h>
27#include <string.h>
28#include <stdio.h>
29
30static void
31do_gai(int family, char *hostname) {
32	struct addrinfo hints, *res, *res0;
33	int error;
34	char namebuf[1024], addrbuf[1024], servbuf[1024];
35
36	memset(&hints, 0, sizeof(hints));
37	hints.ai_family = family;
38	hints.ai_socktype = SOCK_STREAM;
39	hints.ai_flags = AI_CANONNAME;
40	error = getaddrinfo(hostname, "http", &hints, &res0);
41	if (error) {
42		fprintf(stderr, "getaddrinfo failed for %s,family=%d: %s\n",
43			hostname, family, gai_strerror(error));
44		return;
45	}
46
47	for (res = res0; res; res = res->ai_next) {
48		error = getnameinfo(res->ai_addr, res->ai_addrlen,
49				    addrbuf, sizeof(addrbuf),
50				    NULL, 0, NI_NUMERICHOST);
51		if (error == 0)
52			error = getnameinfo(res->ai_addr, res->ai_addrlen,
53					    namebuf, sizeof(namebuf),
54					    servbuf, sizeof(servbuf), 0);
55		if (error != 0) {
56			fprintf(stderr, "getnameinfo failed: %s\n",
57				gai_strerror(error));
58		} else {
59			printf("%s(%s/%s)=%s:%s\n", hostname,
60			       res->ai_canonname, addrbuf, namebuf, servbuf);
61		}
62	}
63
64	freeaddrinfo(res);
65}
66
67int
68main(int argc, char *argv[]) {
69	if (argc < 2)
70		exit(1);
71
72	do_gai(AF_INET, argv[1]);
73	do_gai(AF_INET6, argv[1]);
74	do_gai(AF_UNSPEC, argv[1]);
75
76	exit(0);
77}