libc/example.c

   1 /* example.c    Example code showing how to use IDN enabled getaddrinfo().
   2  * Copyright (C) 2003, 2004  Simon Josefsson
   3  *
   4  * This file is part of GNU Libidn.
   5  *
   6  * GNU Libidn is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * GNU Libidn is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with GNU Libidn; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  */
  21
  22 #define _GNU_SOURCE 1
  23 #include <sys/types.h>
  24 #include <sys/socket.h>
  25 #include <netdb.h>
  26 #include <sys/socket.h>
  27 #include <netinet/in.h>
  28 #include <arpa/inet.h>
  29 #include <locale.h>             /* setlocale() */
  30
  31 /*
  32  * Compiling against IDN enabled Libc:
  33  *
  34  * $ 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
  35  * $ CHARSET=iso-8859-1 ./example
  36  * locale charset `iso-8859-1'
  37  * gettaddrinfo(räksmörgås.josefsson.org):
  38  * address `217.13.230.178'
  39  * canonical name `178.230.13.217.in-addr.dgcsystems.net'
  40  * $
  41  *
  42  * Internally the name iesg--rksmrgsa-0zap8p.josefsson.org is looked
  43  * up in DNS.
  44  */
  45
  46 int
  47 main(int argc, char *argv[])
  48 {
  49   char *in = argc > 1 ? argv[1] : "räksmörgås.josefsson.org";
  50   struct addrinfo hints;
  51   struct addrinfo *res = NULL;
  52   int rc;
  53
  54   setlocale (LC_ALL, "");
  55
  56   //printf("locale charset `%s'\n", stringprep_locale_charset());
  57
  58   memset(&hints, 0, sizeof(hints));
  59   hints.ai_flags = AI_CANONNAME|AI_IDN;
  60
  61   printf("gettaddrinfo(%s):\n", in);
  62   rc = getaddrinfo(in, NULL, &hints, &res);
  63   if (rc)
  64     printf("gai err %d: %s\n", rc, gai_strerror(rc));
  65   else if (res)
  66     printf("address `%s'\ncanonical name `%s'\n",
  67            res->ai_addr ?
  68            /* FIXME: Use inet_ntop, so it works for IPv6 too. */
  69            inet_ntoa(((struct sockaddr_in*)res->ai_addr)->sin_addr) : "ERROR",
  70            res->ai_canonname ? res->ai_canonname : "ERROR");
  71   else
  72     printf("Bad magic\n");
  73
  74   return 0;
  75 }