/**
 * The Forgotten Server - a free and open-source MMORPG server emulator
 * Copyright (C) 2016  Mark Samman <mark.samman@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 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "otpch.h"

#include "protocolold.h"
#include "outputmessage.h"

#include "game.h"

extern Game g_game;

void ProtocolOld::disconnectClient(const std::string& message)
{
	auto output = OutputMessagePool::getOutputMessage();
	output->addByte(0x0A);
	output->addString(message);
	send(output);

	disconnect();
}

void ProtocolOld::onRecvFirstMessage(NetworkMessage& msg)
{
	if (g_game.getGameState() == GAME_STATE_SHUTDOWN) {
		disconnect();
		return;
	}

	/*uint16_t clientOS =*/ msg.get<uint16_t>();
	uint16_t version = msg.get<uint16_t>();
	msg.skipBytes(12);

	if (version <= 760) {
		disconnectClient("Only clients with protocol " CLIENT_VERSION_STR " allowed!");
		return;
	}

	if (!Protocol::RSA_decrypt(msg)) {
		disconnect();
		return;
	}

	uint32_t key[4];
	key[0] = msg.get<uint32_t>();
	key[1] = msg.get<uint32_t>();
	key[2] = msg.get<uint32_t>();
	key[3] = msg.get<uint32_t>();
	enableXTEAEncryption();
	setXTEAKey(key);

	if (version <= 822) {
		disableChecksum();
	}

	disconnectClient("Only clients with protocol " CLIENT_VERSION_STR " allowed!");
}
