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/*
This file is part of ICMPTX
VTun - Virtual Tunnel over TCP/IP network.
Copyright (C) 1998-2000 Maxim Krasnyansky <max_mk@yahoo.com>
Copyright (C) 2006 Thomer M. Gil <thomer@thomer.com>
Copyright (C) 2008 John Plaxco <john@johnplaxco.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.
You should have received a copy of the GNU General Public License
along with this ICMPTX. If not, see <http://www.gnu.org/licenses/>.
*/
/* #include "config.h" */
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <syslog.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <linux/if.h>
int snprintf(char *str, size_t size, const char *format, ...);
/*
* Allocate TUN device, returns opened fd.
*/
int tun_open_old() {
char tunname[14];
int i, fd;
for(i=0; i < 255; i++){
sprintf(tunname, "/dev/tun%d", i);
/* Open device */
if( (fd=open(tunname, O_RDWR)) > 0 ){
return fd;
}
}
return -1;
}
#include <linux/if_tun.h>
/* pre 2.4.6 compatibility */
#define OTUNSETIFF (('T'<< 8) | 202)
/*
* find a tun device and open it, returning the file descriptor on success or -1 on failure with errno possibly set.
*/
int tun_open() {
struct ifreq ifr;
int fd;
if ((fd = open("/dev/net/tun", O_RDWR)) < 0) {
return tun_open_old();
}
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TUN | IFF_NO_PI;
if (ioctl(fd, TUNSETIFF, (void *) &ifr) < 0) {
if (errno == EBADFD) {
/* Try old ioctl */
if (ioctl(fd, OTUNSETIFF, (void *) &ifr) < 0)
goto failed;
} else
goto failed;
}
return fd;
failed:
close(fd);
return -1;
}
int tun_close(int fd) {
return close(fd);
}
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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