blob: 6f476386e296e33853f8aa42cf3c053149e1b420 [file] [log] [blame]
* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <linux/if.h>
#include <linux/if_tun.h>
static int
tun_alloc(char *dev)
struct ifreq ifr;
int fd, err;
if ((fd = open ("/dev/net/tun", O_RDWR)) < 0) {
printf ("Error opening /dev/net/tun: %s\n", strerror (errno));
return -1;
memset (&ifr, 0, sizeof (ifr));
/* Flags: IFF_TUN - TUN device (no Ethernet headers)
* IFF_TAP - TAP device
* IFF_NO_PI - Do not provide packet information
ifr.ifr_flags = IFF_TAP;
if (*dev)
strncpy (ifr.ifr_name, dev, IFNAMSIZ);
if ((err = ioctl (fd, TUNSETIFF, (void *) &ifr)) < 0) {
printf ("Error calling TUNSETIFF: %s\n", strerror (errno));
close (fd);
return err;
strncpy (dev, ifr.ifr_name, IFNAMSIZ);
return fd;
main (int argc, const char *argv[])
int fd;
char namebuf[IFNAMSIZ];
strcpy (namebuf, "pseudo-modem%d");
fd = tun_alloc (namebuf);
if (fd == -1)
exit (1);
printf ("%s\n", namebuf);
while (1)
sleep (3600);
return 0;