#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>

#define BUF_SIZE 500

int
main (int argc, char *argv[])
{
    struct addrinfo hints;
    struct addrinfo *result, *rp;
    int s, j;
    char buf[BUF_SIZE];

    if (argc != 3)
    {
	fprintf (stderr, "Usage: %s host port\n", argv[0]);
	exit (EXIT_FAILURE);
    }

    /* Obtain address(es) matching host/port */

    memset (&hints, 0, sizeof (struct addrinfo));
    hints.ai_family = AF_UNSPEC;	/* Allow IPv4 or IPv6 */
    hints.ai_socktype = SOCK_STREAM;	/* Datagram socket */
    hints.ai_flags = AI_ADDRCONFIG;

    s = getaddrinfo (argv[1], argv[2], &hints, &result);
    if (s != 0)
    {
	fprintf (stderr, "getaddrinfo: %s\n", gai_strerror (s));
	exit (EXIT_FAILURE);
    }

    /* getaddrinfo() returns a list of address structures.
       Try each address until we successfully connect(2).
       If socket(2) (or connect(2)) fails, we (close the socket
       and) try the next address. */

    for (rp = result, j = 0; rp != NULL; rp = rp->ai_next)
    {
	if (0 == getnameinfo(rp->ai_addr, rp->ai_addrlen, buf, sizeof(buf), NULL, 0, NI_NUMERICHOST)) {
	    printf("Address %d: %s\n", ++j, buf);
	} else {
	    printf("getnameinfo failed, skipping this address\n");
	}

    }
    exit(EXIT_SUCCESS);
}