ip_finder undocumented

/****************************************************************************
    ringneckparrot (c)
    License: http://creativecommons.org/licenses/by-nc-sa/3.0/

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

#define ErrorValue -1

main(int argc, char **argv)
{
    struct addrinfo hints;
    struct addrinfo *res;
    struct addrinfo *p;
    int GetInfo;
    char *host;
    char ipstr[INET6_ADDRSTRLEN];

    if ( argc != 2 )
    {
        printf("usage: %s [host]\n",argv[0]);
    }

    else
    {
        bzero(&hints, sizeof hints);
        hints.ai_family = AF_UNSPEC;
        hints.ai_socktype = SOCK_STREAM;

        host = argv[1];

        GetInfo = getaddrinfo(host, NULL, &hints, &res);

        if (GetInfo == ErrorValue)
        {
            fprintf(stderr, "Error: %s\n", gai_strerror(GetInfo));
        }

        printf("IP Addresses for the given host: %s\n\n",host);

        for( p = res; p != NULL; p = p->ai_next)
        {
            void *addr;
            char *ipversion;

            if( p->ai_family == AF_INET)
            {
                struct sockaddr_in *ipv4;
                ipv4 = (struct sockaddr_in *)p->ai_addr;
                addr = &(ipv4->sin_addr);
                ipversion = "IPv4";
            }

            else
            {
                struct sockaddr_in6 *ipv6;
                ipv6 = (struct sockaddr_in6 *)p->ai_addr;
                addr = &(ipv6->sin6_addr);
                ipversion = "IPv6";
            }

            inet_ntop(p->ai_family, addr, ipstr, sizeof ipstr);

            printf("%s: %s\n", ipversion, ipstr);
    }
    freeaddrinfo(res);
    }
}