1/* $NetBSD: sample-gai.c,v 1.2.6.1 2012/06/05 21:15:36 bouyer Exp $ */ 2 3/* 4 * Copyright (C) 2009 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 <sys/types.h> 24#include <sys/socket.h> 25 26#include <irs/netdb.h> 27 28#include <stdlib.h> 29#include <string.h> 30#include <stdio.h> 31 32static void 33do_gai(int family, char *hostname) { 34 struct addrinfo hints, *res, *res0; 35 int error; 36 char namebuf[1024], addrbuf[1024], servbuf[1024]; 37 38 memset(&hints, 0, sizeof(hints)); 39 hints.ai_family = family; 40 hints.ai_socktype = SOCK_STREAM; 41 hints.ai_flags = AI_CANONNAME; 42 error = getaddrinfo(hostname, "http", &hints, &res0); 43 if (error) { 44 fprintf(stderr, "getaddrinfo failed for %s,family=%d: %s\n", 45 hostname, family, gai_strerror(error)); 46 return; 47 } 48 49 for (res = res0; res; res = res->ai_next) { 50 error = getnameinfo(res->ai_addr, res->ai_addrlen, 51 addrbuf, sizeof(addrbuf), 52 NULL, 0, NI_NUMERICHOST); 53 if (error == 0) 54 error = getnameinfo(res->ai_addr, res->ai_addrlen, 55 namebuf, sizeof(namebuf), 56 servbuf, sizeof(servbuf), 0); 57 if (error != 0) { 58 fprintf(stderr, "getnameinfo failed: %s\n", 59 gai_strerror(error)); 60 } else { 61 printf("%s(%s/%s)=%s:%s\n", hostname, 62 res->ai_canonname, addrbuf, namebuf, servbuf); 63 } 64 } 65 66 freeaddrinfo(res); 67} 68 69int 70main(int argc, char *argv[]) { 71 if (argc < 2) 72 exit(1); 73 74 do_gai(AF_INET, argv[1]); 75 do_gai(AF_INET6, argv[1]); 76 do_gai(AF_UNSPEC, argv[1]); 77 78 exit(0); 79} 80