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VTun - Virtual Tunnel over TCP/IP network.
Copyright (C) 1998-2000 Maxim Krasnyansky <>
VTun has been derived from VPPP package by Maxim Krasnyansky.
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.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
* tun_dev.c,v 2006/11/16 04:04:23 mtbishop Exp
/* #include "config.h" */
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <syslog.h>
#include <sys/ioctl.h>
#include <net/if_tun.h>
/* #include "vtun.h"
#include "lib.h" */
* Allocate TUN device, returns opened fd.
* Stores dev name in the first arg(must be large enough).
int tun_open(char *dev)
char tunname[14];
int i, fd = -1;
if( *dev ){
sprintf(tunname, "/dev/%s", dev);
fd = open(tunname, O_RDWR);
} else {
for(i=0; i < 255; i++){
sprintf(tunname, "/dev/tun%d", i);
/* Open device */
if( (fd=open(tunname, O_RDWR)) > 0 ){
sprintf(dev, "tun%d", i);
if( fd > -1 ){
/* Disable extended modes */
ioctl(fd, TUNSLMODE, &i);
ioctl(fd, TUNSIFHEAD, &i);
return fd;
int tun_close(int fd, char *dev)
return close(fd);
/* Read/write frames from/to TUN device */
int tun_write(int fd, char *buf, int len)
return write(fd, buf, len);
int tun_read(int fd, char *buf, int len)
return read(fd, buf, len);
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