84 lines
1.9 KiB
C
84 lines
1.9 KiB
C
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/*
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VTun - Virtual Tunnel over TCP/IP network.
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Copyright (C) 1998-2000 Maxim Krasnyansky <max_mk@yahoo.com>
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VTun has been derived from VPPP package by Maxim Krasnyansky.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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*/
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/*
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* $Id: tun_dev.c,v 1.5.2.1 2007/06/29 05:26:53 mtbishop Exp $
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*/
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#include "config.h"
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#include <unistd.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <syslog.h>
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#include <sys/ioctl.h>
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#include <net/if_tun.h>
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#include "vtun.h"
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#include "lib.h"
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/*
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* Allocate TUN device, returns opened fd.
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* Stores dev name in the first arg(must be large enough).
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*/
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int tun_open(char *dev)
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{
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char tunname[14];
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int i, fd = -1;
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if( *dev ){
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sprintf(tunname, "/dev/%s", dev);
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fd = open(tunname, O_RDWR);
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} else {
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for(i=0; i < 255; i++){
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sprintf(tunname, "/dev/tun%d", i);
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/* Open device */
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if( (fd=open(tunname, O_RDWR)) > 0 ){
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sprintf(dev, "tun%d", i);
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break;
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}
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}
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}
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if( fd > -1 ){
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i=0;
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/* Disable extended modes */
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ioctl(fd, TUNSLMODE, &i);
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ioctl(fd, TUNSIFHEAD, &i);
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}
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return fd;
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}
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int tun_close(int fd, char *dev)
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{
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return close(fd);
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}
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/* Read/write frames from/to TUN device */
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int tun_write(int fd, char *buf, int len)
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{
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return write(fd, buf, len);
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}
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int tun_read(int fd, char *buf, int len)
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{
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return read(fd, buf, len);
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}
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