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/* example.c --- Example code showing how to use IDN enabled getaddrinfo().
* Copyright (C) 2003-2025 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 <https://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;
}
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