1 /* $NetBSD: sample-gai.c,v 1.1.1.4 2014/12/10 03:34:46 christos Exp $ */
2
3 /*
4 * Copyright (C) 2009, 2012-2014 Internet Systems Consortium, Inc. ("ISC")
5 *
6 * Permission to use, copy, modify, and/or distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
11 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
12 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
13 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
14 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
15 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
16 * PERFORMANCE OF THIS SOFTWARE.
17 */
18
19 /* Id: sample-gai.c,v 1.4 2009/09/02 23:48:02 tbox Exp */
20
21 #include <config.h>
22
23 #include <isc/net.h>
24
25 #include <irs/netdb.h>
26
27 #include <stdlib.h>
28 #include <string.h>
29 #include <stdio.h>
30
31 static void
do_gai(int family,char * hostname)32 do_gai(int family, char *hostname) {
33 struct addrinfo hints, *res, *res0;
34 int error;
35 char namebuf[1024], addrbuf[1024], servbuf[1024];
36
37 memset(&hints, 0, sizeof(hints));
38 hints.ai_family = family;
39 hints.ai_socktype = SOCK_STREAM;
40 hints.ai_flags = AI_CANONNAME;
41 error = getaddrinfo(hostname, "http", &hints, &res0);
42 if (error) {
43 fprintf(stderr, "getaddrinfo failed for %s,family=%d: %s\n",
44 hostname, family, gai_strerror(error));
45 return;
46 }
47
48 for (res = res0; res; res = res->ai_next) {
49 error = getnameinfo(res->ai_addr,
50 (socklen_t)res->ai_addrlen,
51 addrbuf, sizeof(addrbuf),
52 NULL, 0, NI_NUMERICHOST);
53 if (error == 0)
54 error = getnameinfo(res->ai_addr,
55 (socklen_t)res->ai_addrlen,
56 namebuf, sizeof(namebuf),
57 servbuf, sizeof(servbuf), 0);
58 if (error != 0) {
59 fprintf(stderr, "getnameinfo failed: %s\n",
60 gai_strerror(error));
61 } else {
62 printf("%s(%s/%s)=%s:%s\n", hostname,
63 res->ai_canonname, addrbuf, namebuf, servbuf);
64 }
65 }
66
67 freeaddrinfo(res0);
68 }
69
70 int
main(int argc,char * argv[])71 main(int argc, char *argv[]) {
72 if (argc < 2)
73 exit(1);
74
75 do_gai(AF_INET, argv[1]);
76 do_gai(AF_INET6, argv[1]);
77 do_gai(AF_UNSPEC, argv[1]);
78
79 return (0);
80 }
81