/*
 *  Hans - IP over ICMP
 *  Copyright (C) 2009 Friedrich Schöller <friedrich.schoeller@gmail.com>
 *  
 *  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 3 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, see <http://www.gnu.org/licenses/>.
 *  
 */

#ifndef CLIENT_H
#define CLIENT_H

#include "worker.h"
#include "auth.h"

#include <vector>

class Client : public Worker
{
public:
	Client(int tunnelMtu, const char *deviceName, uint32_t serverIp, int maxPolls, const char *passphrase, uid_t uid, gid_t gid);
	virtual ~Client();

	virtual void run();

	static const Worker::TunnelHeader::Magic magic;
protected:
	enum State
	{
		STATE_CLOSED,
		STATE_CONNECTION_REQUEST_SENT,
		STATE_CHALLENGE_RESPONSE_SENT,
		STATE_ESTABLISHED
	};

	virtual bool handleEchoData(TunnelHeader header, int dataLength, uint32_t realIp, bool reply, int id, int seq);
	virtual void handleTunData(int dataLength, uint32_t sourceIp, uint32_t destIp);
	virtual void handleTimeout();

	void handleDataFromServer(int length);

	void startPolling();

	void sendEchoToServer(int type, int dataLength);
	void sendChallengeResponse(int dataLength);
	void sendConnectionRequest();

	Auth auth;

	uint32_t serverIp;

	int maxPolls;
	int pollTimeoutNr;

	State state;
};

#endif