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itund/tun.c

69 lines
1.7 KiB

/*
* TUN/TAP driver interface functions
*
* Copyright 2004 SYSGO Real-Time Solutions AG
* Klein-Winternheim, Germany
* All rights reserved.
*
* Author: Armin Schindler <armin.schindler@sysgo.com>
*
* $Id$
*
* 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. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*/
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <linux/if.h>
#include <linux/if_tun.h>
unsigned char dev_name[IFNAMSIZ] = {"isdn%d"};
int itun_alloc(char *dev, int ether)
{
struct ifreq ifr;
int fd, err;
if((fd = open("/dev/net/tun", O_RDWR)) >= 0) {
memset(&ifr, 0, sizeof(ifr));
/* Flags: IFF_TUN - TUN device (no Ethernet headers, PTP)
* IFF_TAP - TAP device (with Ethernet headers)
*
* IFF_NO_PI - Do not provide packet information
*/
ifr.ifr_flags = (ether) ? IFF_TAP : IFF_TUN;
ifr.ifr_flags |= IFF_NO_PI;
if (*dev)
strncpy(ifr.ifr_name, dev, IFNAMSIZ);
if((err = ioctl(fd, TUNSETIFF, (void *) &ifr)) < 0) {
close(fd);
return(err);
}
strcpy(dev, ifr.ifr_name);
}
return(fd);
}
void itun_close(int fd)
{
close(fd);
}