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protocol.h
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protocol.h
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/**
* The Forgotten Server - a free and open-source MMORPG server emulator
* Copyright (C) 2019 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.
*/
#ifndef FS_PROTOCOL_H_D71405071ACF4137A4B1203899DE80E1
#define FS_PROTOCOL_H_D71405071ACF4137A4B1203899DE80E1
#include "connection.h"
#include "xtea.h"
class Protocol : public std::enable_shared_from_this<Protocol>
{
public:
explicit Protocol(Connection_ptr connection) : connection(connection) {}
virtual ~Protocol() = default;
// non-copyable
Protocol(const Protocol&) = delete;
Protocol& operator=(const Protocol&) = delete;
virtual void parsePacket(NetworkMessage&) {}
virtual void onSendMessage(const OutputMessage_ptr& msg);
void onRecvMessage(NetworkMessage& msg);
virtual void onRecvFirstMessage(NetworkMessage& msg) = 0;
virtual void onConnect() {}
bool isConnectionExpired() const {
return connection.expired();
}
Connection_ptr getConnection() const {
return connection.lock();
}
uint32_t getIP() const;
//Use this function for autosend messages only
OutputMessage_ptr getOutputBuffer(int32_t size);
OutputMessage_ptr& getCurrentBuffer() {
return outputBuffer;
}
void send(OutputMessage_ptr msg) const {
if (auto connection = getConnection()) {
connection->send(msg);
}
}
protected:
void disconnect() const {
if (auto connection = getConnection()) {
connection->close();
}
}
void enableXTEAEncryption() {
encryptionEnabled = true;
}
void setXTEAKey(xtea::key key) {
this->key = std::move(key);
}
void disableChecksum() {
checksumEnabled = false;
}
void enableSequence() {
sequenceEnabled = true;
}
static bool RSA_decrypt(NetworkMessage& msg);
void setRawMessages(bool value) {
rawMessages = value;
}
virtual void release() {}
private:
void XTEA_encrypt(OutputMessage& msg) const;
bool XTEA_decrypt(NetworkMessage& msg) const;
friend class Connection;
OutputMessage_ptr outputBuffer;
const ConnectionWeak_ptr connection;
xtea::key key;
bool encryptionEnabled = false;
bool checksumEnabled = true;
bool sequenceEnabled = false;
bool rawMessages = false;
uint32_t sequenceNumber = 0;
};
#endif