/*      $NetBSD: trygetif.c,v 1.6 2007/03/10 00:16:51 hubertf Exp $     */

#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: trygetif.c,v 1.6 2007/03/10 00:16:51 hubertf Exp $");
#endif

/*
 * trygetif.c - test program for getif.c
 */

#include <sys/types.h>
#include <sys/socket.h>

#if defined(SUNOS) || defined(SVR4)
#include <sys/sockio.h>
#endif

#include <net/if.h>                             /* for struct ifreq */
#include <netinet/in.h>
#include <arpa/inet.h>                  /* inet_ntoa */

#include <netdb.h>
#include <stdio.h>
#include <errno.h>

#include "getif.h"

int
main(int argc, char **argv)
{
        struct hostent *hep;
        struct sockaddr ea;                     /* Ethernet address */
        struct sockaddr_in *sip;        /* Interface address */
        struct ifreq *ifr;
        struct in_addr dst_addr;
        struct in_addr *dap;
        int i, s;

        dap = NULL;
        if (argc > 1) {
                dap = &dst_addr;
                if (inet_aton(argv[1], &dst_addr) == 0) {
                        hep = gethostbyname(argv[1]);
                        if (!hep) {
                                fprintf(stderr, "gethostbyname(%s)\n", argv[1]);
                                exit(1);
                        }
                        memcpy(&dst_addr, hep->h_addr, sizeof(dst_addr));
                }
        }
        s = socket(AF_INET, SOCK_DGRAM, 0);
        if (s < 0) {
                perror("socket open");
                exit(1);
        }
        ifr = getif(s, dap);
        if (!ifr) {
                fprintf(stderr, "no interface for address\n");
                exit(1);
        }
        printf("Intf-name:%s\n", ifr->ifr_name);
        sip = (struct sockaddr_in *) &(ifr->ifr_addr);
        printf("Intf-addr:%s\n", inet_ntoa(sip->sin_addr));

        return 0;
}