WorldSocket.h

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/*
 * This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
 *
 * 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, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef TRINITYCORE_WORLD_SOCKET_H
#define TRINITYCORE_WORLD_SOCKET_H
 
#include "Common.h"
#include "ServerPktHeader.h"
#include "Socket.h"
#include "Util.h"
#include "WorldPacket.h"
#include "WorldSession.h"
#include "WorldPacketCrypt.h"
#include "MPSCQueue.h"
#include <boost/asio/ip/tcp.hpp>
 
using boost::asio::ip::tcp;
class EncryptablePacket : public WorldPacket
{
public:
    EncryptablePacket(WorldPacket const& packet, bool encrypt) : WorldPacket(packet), _encrypt(encrypt)
    {
        SocketQueueLink.store(nullptr, std::memory_order_relaxed);
    }
 
    bool NeedsEncryption() const { return _encrypt; }
 
    std::atomic<EncryptablePacket*> SocketQueueLink;
 
private:
    bool _encrypt;
};
 
namespace WorldPackets
{
    class ServerPacket;
}
#pragma pack(push, 1)
 
struct ClientPktHeader
{
    uint16 size;
    uint32 cmd;
 
    bool IsValidSize() const { return size >= 4 && size < 10240; }
    bool IsValidOpcode() const { return cmd < NUM_OPCODE_HANDLERS; }
};
 
#pragma pack(pop)
 
struct AuthSession;
 
class TC_GAME_API WorldSocket final : public Trinity::Net::Socket<>
{
    using BaseSocket = Socket;
 
public:
    WorldSocket(Trinity::Net::IoContextTcpSocket&& socket);
    ~WorldSocket();
 
    WorldSocket(WorldSocket const& right) = delete;
    WorldSocket(WorldSocket&& right) = delete;
    WorldSocket& operator=(WorldSocket const& right) = delete;
    WorldSocket& operator=(WorldSocket&& right) = delete;
 
    void Start() override;
    bool Update() override;
 
    void SendPacket(WorldPacket const& packet);
 
    void SetSendBufferSize(std::size_t sendBufferSize) { _sendBufferSize = sendBufferSize; }
 
    void OnClose() override;
    Trinity::Net::SocketReadCallbackResult ReadHandler() override;
 
    void QueueQuery(QueryCallback&& queryCallback);
 
    void SendAuthSession();
 
protected:
    bool ReadHeaderHandler();
 
    enum class ReadDataHandlerResult
    {
        Ok = 0,
        Error = 1,
        WaitingForQuery = 2
    };
 
    ReadDataHandlerResult ReadDataHandler();
 
private:
    void LogOpcodeText(OpcodeClient opcode, std::unique_lock<std::mutex> const& guard) const;
    void SendPacketAndLogOpcode(WorldPacket const& packet);
    void HandleAuthSession(WorldPacket& recvPacket);
    void HandleAuthSessionCallback(std::shared_ptr<AuthSession> authSession, PreparedQueryResult result);
    void LoadSessionPermissionsCallback(PreparedQueryResult result);
    void SendAuthResponseError(uint8 code);
 
    bool HandlePing(WorldPacket& recvPacket);
 
    std::array<uint8, 4> _serverChallenge;
    std::array<uint8, 32> _dosChallenge;
    WorldPacketCrypt _authCrypt;
 
    TimePoint _LastPingTime;
    uint32 _OverSpeedPings;
 
    std::mutex _worldSessionLock;
    WorldSession* _worldSession;
    bool _authed;
 
    MessageBuffer _headerBuffer;
    MessageBuffer _packetBuffer;
    MPSCQueue<EncryptablePacket, &EncryptablePacket::SocketQueueLink> _bufferQueue;
    std::size_t _sendBufferSize;
 
    QueryCallbackProcessor _queryProcessor;
    std::string _ipCountry;
};
 
#endif