/* example.c --- Example code showing how to use IDN enabled getaddrinfo(). * Copyright (C) 2003-2016 Simon Josefsson * * This file is part of GNU Libidn. * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. * */ #define _GNU_SOURCE 1 #include <sys/types.h> #include <sys/socket.h> #include <netdb.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <locale.h> /* setlocale() */ /* * Compiling against IDN enabled Libc: * * $ gcc -o example example.c -L/usr/local/glibc/lib -Wl,-rpath,/usr/local/glibc/lib -nostdinc -I/usr/local/glibc/include -I/usr/include -I/usr/lib/gcc-lib/i486-linux/3.3.3/include * $ CHARSET=iso-8859-1 ./example * locale charset `iso-8859-1' * gettaddrinfo(räksmörgås.josefsson.org): * address `217.13.230.178' * canonical name `178.230.13.217.in-addr.dgcsystems.net' * $ * * Internally the name iesg--rksmrgsa-0zap8p.josefsson.org is looked * up in DNS. */ int main(int argc, char *argv[]) { char *in = argc > 1 ? argv[1] : "räksmörgås.josefsson.org"; struct addrinfo hints; struct addrinfo *res = NULL; int rc; setlocale (LC_ALL, ""); //printf("locale charset `%s'\n", stringprep_locale_charset()); memset(&hints, 0, sizeof(hints)); hints.ai_flags = AI_CANONNAME|AI_IDN; printf("gettaddrinfo(%s):\n", in); rc = getaddrinfo(in, NULL, &hints, &res); if (rc) printf("gai err %d: %s\n", rc, gai_strerror(rc)); else if (res) printf("address `%s'\ncanonical name `%s'\n", res->ai_addr ? /* FIXME: Use inet_ntop, so it works for IPv6 too. */ inet_ntoa(((struct sockaddr_in*)res->ai_addr)->sin_addr) : "ERROR", res->ai_canonname ? res->ai_canonname : "ERROR"); else printf("Bad magic\n"); return 0; }