/* Copyright (c) 2003, Rene Luria aka herel <rene@luria.ch>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright notice,
 *     * this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *     * notice, this list of conditions and the following disclaimer in the
 *     * documentation and/or other materials provided with the distribution.
 *     * Neither the name of the author nor the names of its
 *     * contributors may be used to endorse or promote products derived from
 *     * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>

static char *to_full_uncompressed (unsigned char *s)
{
        char *addr;
        if ((addr = malloc (36)) == NULL)
                perror ("malloc");
        else
        {
                int i;
                char *buf = addr;
                for (i = 0; i < 8; i++)
                {
                        sprintf (buf, "%04x", (s[i * 2] << 8) | (s[i * 2 + 1]));
                        buf += 4;
                        if (i < 7)
                                *(buf++) = ':';
                        else
                                *(buf) = '\0';
                }
        }
        return addr;
}

int main (int argc, char **argv)
{
        char *addr;
        struct in6_addr in;
        if (argc != 2)
        {
                fprintf (stderr, "bad arguments number\n");
                return EXIT_FAILURE;
        }
        if (inet_pton (AF_INET6, argv[1], &in) <= 0)
        {
                perror ("inet_pton");
                return EXIT_FAILURE;
        }
        if ((addr = to_full_uncompressed (in.s6_addr)) == NULL)
                return EXIT_FAILURE;
        printf ("%s\n", addr);
        return EXIT_SUCCESS;
}