mirror of https://github.com/OpenTTD/OpenTTD.git
110 lines
5.5 KiB
C++
110 lines
5.5 KiB
C++
/*
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* This file is part of OpenTTD.
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* OpenTTD 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, version 2.
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* OpenTTD 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.
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* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file network_coordinator.h Part of the network protocol handling Game Coordinator requests. */
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#ifndef NETWORK_COORDINATOR_H
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#define NETWORK_COORDINATOR_H
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#include "core/tcp_coordinator.h"
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#include "network_stun.h"
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#include "network_turn.h"
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/**
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* Game Coordinator communication.
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* For more detail about what the Game Coordinator does, please see
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* docs/game_coordinator.md.
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*
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* For servers:
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* - Server sends SERVER_REGISTER.
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* - Game Coordinator probes server to check if it can directly connect.
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* - Game Coordinator sends GC_REGISTER_ACK with type of connection.
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* - Server sends every 30 seconds SERVER_UPDATE.
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*
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* For clients (listing):
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* - Client sends CLIENT_LISTING.
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* - Game Coordinator returns the full list of public servers via GC_LISTING (multiple packets).
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*
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* For clients (connecting):
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* - Client sends CLIENT_CONNECT.
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* - Game Coordinator checks what type of connections the servers supports:
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* 1) Direct connect?
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* - Send the client a GC_CONNECT with the peer address.
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* - a) Client connects, client sends CLIENT_CONNECTED to Game Coordinator.
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* - b) Client connect fails, client sends CLIENT_CONNECT_FAILED to Game Coordinator.
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* 2) STUN?
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* - Game Coordinator sends GC_STUN_REQUEST to server/client (asking for both IPv4 and IPv6 STUN requests).
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* - Game Coordinator collects what combination works and sends GC_STUN_CONNECT to server/client.
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* - a) Server/client connect, client sends CLIENT_CONNECTED to Game Coordinator.
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* - b) Server/client connect fails, both send SERCLI_CONNECT_FAILED to Game Coordinator.
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* - Game Coordinator tries other combination if available.
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* 3) TURN?
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* - Game Coordinator sends GC_TURN_CONNECT to server/client.
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* - a) Server/client connect, client sends CLIENT_CONNECTED to Game Coordinator.
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* - b) Server/client connect fails, both send SERCLI_CONNECT_FAILED to Game Coordinator.
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* - If all fails, Game Coordinator sends GC_CONNECT_FAILED to indicate no connection is possible.
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*/
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/** Class for handling the client side of the Game Coordinator connection. */
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class ClientNetworkCoordinatorSocketHandler : public NetworkCoordinatorSocketHandler {
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private:
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std::chrono::steady_clock::time_point next_update; ///< When to send the next update (if server and public).
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std::map<std::string, std::pair<std::string, TCPServerConnecter *>> connecter; ///< Based on tokens, the current (invite-code, connecter) that are pending.
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std::map<std::string, TCPServerConnecter *> connecter_pre; ///< Based on invite codes, the current connecters that are pending.
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std::map<std::string, std::map<int, std::unique_ptr<ClientNetworkStunSocketHandler>>> stun_handlers; ///< All pending STUN handlers, stored by token:family.
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std::map<std::string, std::unique_ptr<ClientNetworkTurnSocketHandler>> turn_handlers; ///< Pending TURN handler (if any), stored by token.
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std::shared_ptr<TCPConnecter> game_connecter{}; ///< Pending connecter to the game server.
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uint32_t newgrf_lookup_table_cursor = 0; ///< Last received cursor for the #GameInfoNewGRFLookupTable updates.
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GameInfoNewGRFLookupTable newgrf_lookup_table; ///< Table to look up NewGRFs in the GC_LISTING packets.
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protected:
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bool Receive_GC_ERROR(Packet &p) override;
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bool Receive_GC_REGISTER_ACK(Packet &p) override;
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bool Receive_GC_LISTING(Packet &p) override;
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bool Receive_GC_CONNECTING(Packet &p) override;
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bool Receive_GC_CONNECT_FAILED(Packet &p) override;
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bool Receive_GC_DIRECT_CONNECT(Packet &p) override;
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bool Receive_GC_STUN_REQUEST(Packet &p) override;
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bool Receive_GC_STUN_CONNECT(Packet &p) override;
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bool Receive_GC_NEWGRF_LOOKUP(Packet &p) override;
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bool Receive_GC_TURN_CONNECT(Packet &p) override;
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public:
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/** The idle timeout; when to close the connection because it's idle. */
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static constexpr std::chrono::seconds IDLE_TIMEOUT = std::chrono::seconds(60);
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std::chrono::steady_clock::time_point last_activity; ///< The last time there was network activity.
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bool connecting; ///< Are we connecting to the Game Coordinator?
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ClientNetworkCoordinatorSocketHandler() : connecting(false) {}
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NetworkRecvStatus CloseConnection(bool error = true) override;
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void SendReceive();
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void ConnectFailure(const std::string &token, uint8_t tracking_number);
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void ConnectSuccess(const std::string &token, SOCKET sock, NetworkAddress &address);
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void StunResult(const std::string &token, uint8_t family, bool result);
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void Connect();
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void CloseToken(const std::string &token);
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void CloseAllConnections();
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void CloseStunHandler(const std::string &token, uint8_t family = AF_UNSPEC);
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void CloseTurnHandler(const std::string &token);
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void Register();
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void SendServerUpdate();
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void GetListing();
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void ConnectToServer(const std::string &invite_code, TCPServerConnecter *connecter);
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void StartTurnConnection(std::string &token);
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};
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extern ClientNetworkCoordinatorSocketHandler _network_coordinator_client;
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#endif /* NETWORK_COORDINATOR_H */
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