busybox

/* vi: set sw=4 ts=4: */

/*

 * iptunnel.c          "ip tunnel"

 *

 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.

 *

 * 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 <netinet/ip.h>

#include <net/if.h>

#include <net/if_arp.h>

#include <asm/types.h>

#ifndef __constant_htons

#define __constant_htons htons

#endif

#include <linux/if_tunnel.h>

​

#include "ip_common.h"  /* #include "libbb.h" is inside */

#include "rt_names.h"

#include "utils.h"

​

​

/* Dies on error */

static int do_ioctl_get_ifindex(char *dev)

{

    struct ifreq ifr;

    int fd;

​

    strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));

    fd = xsocket(AF_INET, SOCK_DGRAM, 0);

    xioctl(fd, SIOCGIFINDEX, &ifr);

    close(fd);

    return ifr.ifr_ifindex;

}

​

static int do_ioctl_get_iftype(char *dev)

{

    struct ifreq ifr;

    int fd;

    int err;

​

    strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));

    fd = xsocket(AF_INET, SOCK_DGRAM, 0);

    err = ioctl_or_warn(fd, SIOCGIFHWADDR, &ifr);

    close(fd);

    return err ? -1 : ifr.ifr_addr.sa_family;

}

​

static char *do_ioctl_get_ifname(int idx)

{

    struct ifreq ifr;

    int fd;

    int err;

​

    ifr.ifr_ifindex = idx;