busybox

/*

 * iptunnel.c          "ip tunnel"

 *

 *      This program is free software; you can redistribute it and/or

 *      modify it under the terms of the GNU General Public License

 *      as published by the Free Software Foundation; either version

 *      2 of the License, or (at your option) any later version.

 *

 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>

 *

 *

 * Changes:

 *

 * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses

 * Rani Assaf <rani@magic.metawire.com> 980930: do not allow key for ipip/sit

 * Phil Karn <karn@ka9q.ampr.org>   990408: "pmtudisc" flag

 */

​

#include <sys/socket.h>

#include <sys/ioctl.h>

​

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

​

#include <arpa/inet.h>

#include <netinet/ip.h>

#include <netinet/in.h>

​

#include <net/if.h>

#include <net/if_arp.h>

​

#include <asm/types.h>

#define __constant_htons htons

#include <linux/if_tunnel.h>

​

#include "rt_names.h"

#include "utils.h"

​

#include "libbb.h"

​

static int do_ioctl_get_ifindex(char *dev)

{

    struct ifreq ifr;

    int fd;

​

    strcpy(ifr.ifr_name, dev);

    fd = socket(AF_INET, SOCK_DGRAM, 0);

    if (ioctl(fd, SIOCGIFINDEX, &ifr)) {

        bb_perror_msg("ioctl");

        return 0;

    }

    close(fd);

    return ifr.ifr_ifindex;

}

​

static int do_ioctl_get_iftype(char *dev)

{

    struct ifreq ifr;

    int fd;

​

    strcpy(ifr.ifr_name, dev);

    fd = socket(AF_INET, SOCK_DGRAM, 0);