mirror of
https://github.com/ErikasKontenis/SabrehavenServer.git
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111 lines
2.7 KiB
C++
111 lines
2.7 KiB
C++
/**
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* Tibia GIMUD Server - a free and open-source MMORPG server emulator
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* Copyright (C) 2019 Sabrehaven and Mark Samman <mark.samman@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "otpch.h"
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#include "protocol.h"
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#include "outputmessage.h"
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#include "rsa.h"
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#include "xtea.h"
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extern RSA g_RSA;
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void Protocol::onSendMessage(const OutputMessage_ptr& msg) const
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{
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if (!rawMessages) {
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msg->writeMessageLength();
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if (encryptionEnabled) {
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XTEA_encrypt(*msg);
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msg->addCryptoHeader(checksumEnabled);
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}
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}
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}
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void Protocol::onRecvMessage(NetworkMessage& msg)
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{
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if (encryptionEnabled && !XTEA_decrypt(msg)) {
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return;
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}
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parsePacket(msg);
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}
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OutputMessage_ptr Protocol::getOutputBuffer(int32_t size)
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{
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//dispatcher thread
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if (!outputBuffer) {
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outputBuffer = OutputMessagePool::getOutputMessage();
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}
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else if ((outputBuffer->getLength() + size) > NetworkMessage::MAX_PROTOCOL_BODY_LENGTH) {
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send(outputBuffer);
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outputBuffer = OutputMessagePool::getOutputMessage();
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}
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return outputBuffer;
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}
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void Protocol::XTEA_encrypt(OutputMessage& msg) const
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{
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// The message must be a multiple of 8
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size_t paddingBytes = msg.getLength() % 8u;
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if (paddingBytes != 0) {
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msg.addPaddingBytes(8 - paddingBytes);
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}
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uint8_t* buffer = msg.getOutputBuffer();
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xtea::encrypt(buffer, msg.getLength(), key);
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}
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bool Protocol::XTEA_decrypt(NetworkMessage& msg) const
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{
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if (((msg.getLength() - 6) & 7) != 0) {
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return false;
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}
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uint8_t* buffer = msg.getBuffer() + msg.getBufferPosition();
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xtea::decrypt(buffer, msg.getLength() - 6, key);
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uint16_t innerLength = msg.get<uint16_t>();
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if (innerLength + 8 > msg.getLength()) {
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return false;
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}
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msg.setLength(innerLength);
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return true;
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}
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bool Protocol::RSA_decrypt(NetworkMessage& msg)
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{
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if ((msg.getLength() - msg.getBufferPosition()) < 128) {
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return false;
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}
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g_RSA.decrypt(reinterpret_cast<char*>(msg.getBuffer()) + msg.getBufferPosition()); //does not break strict aliasing
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return msg.getByte() == 0;
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}
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uint32_t Protocol::getIP() const
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{
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if (auto connection = getConnection()) {
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return connection->getIP();
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}
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return 0;
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}
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