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/*
VTun - Virtual Tunnel over TCP/IP network.
Copyright (C) 1998-2000 Maxim Krasnyansky <max_mk@yahoo.com>
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
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
*/
/*
* tun_dev.c,v 1.2.2.1.2.1 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);
break;
}
}
}
if( fd > -1 ){
i=0;
/* 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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