TunDevice.h

/***************************************************************************
 *   Copyright (C) 2007 by Jahn Bertsch                                    *
 *                                                                         *
 *   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 program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/

#ifndef TUNDEVICE_H_
#define TUNDEVICE_H_

/**
 * \file 
 * Creates a tun device to be able to grab data from the upper layer which is
 * destined for the network card.
 */

//FIXME: check if all of these are needed
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/socket.h> // required by if.h
#include <sys/types.h>
#include <string.h>
#include <linux/if.h> // IFNAMSIZ
#include <linux/if_tun.h>
#include <unistd.h>
#include <net/if_arp.h>
#include <net/route.h>
#include <errno.h>

// for packet display
#include <net/ethernet.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>


#include <iostream>

#include "defines.h"

/**
* Represents a tun decive.
*/
class TunDevice
{
public:
    TunDevice(const char *dev, const char *ip);
    ~TunDevice();

    void tunRead(char *buffer, int bufferSize, ssize_t *bytesRead);
    ssize_t tunWrite(const void *buf, size_t len);
    int getFd();
    void getIp(in_addr *ip);
    void setCatchAllDefaultGateway();
    void restoreDefaultGateway();

private:
    int fd;
    in_addr ip;
    char deviceName[IFNAMSIZ];
    struct rtentry defaultGateway;

    void createDevice(const char *dev);
};

#endif /*TUNDEVICE_H_*/