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} 78