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/* $Id$ */
/*
* This file is part of OpenTTD.
* 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.
* 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.
* 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/>.
*/
/**
* @file core/udp.h Basic functions to receive and send UDP packets.
*/
#ifndef NETWORK_CORE_UDP_H
#define NETWORK_CORE_UDP_H
#include "address.h"
#include "game.h"
#include "packet.h"
/** Enum with all types of UDP packets. The order MUST not be changed **/
enum PacketUDPType {
PACKET_UDP_CLIENT_FIND_SERVER, ///< Queries a game server for game information
PACKET_UDP_SERVER_RESPONSE, ///< Reply of the game server with game information
PACKET_UDP_CLIENT_DETAIL_INFO, ///< Queries a game server about details of the game, such as companies
PACKET_UDP_SERVER_DETAIL_INFO, ///< Reply of the game server about details of the game, such as companies
PACKET_UDP_SERVER_REGISTER, ///< Packet to register itself to the master server
PACKET_UDP_MASTER_ACK_REGISTER, ///< Packet indicating registration has succeeded
PACKET_UDP_CLIENT_GET_LIST, ///< Request for serverlist from master server
PACKET_UDP_MASTER_RESPONSE_LIST, ///< Response from master server with server ip's + port's
PACKET_UDP_SERVER_UNREGISTER, ///< Request to be removed from the server-list
PACKET_UDP_CLIENT_GET_NEWGRFS, ///< Requests the name for a list of GRFs (GRF_ID and MD5)
PACKET_UDP_SERVER_NEWGRFS, ///< Sends the list of NewGRF's requested.
PACKET_UDP_MASTER_SESSION_KEY, ///< Sends a fresh session key to the client
PACKET_UDP_END, ///< Must ALWAYS be on the end of this list!! (period)
};
/** The types of server lists we can get */
enum ServerListType {
SLT_IPv4 = 0, ///< Get the IPv4 addresses
SLT_IPv6 = 1, ///< Get the IPv6 addresses
SLT_AUTODETECT, ///< Autodetect the type based on the connection
SLT_END = SLT_AUTODETECT, ///< End of 'arrays' marker
};
/** Base socket handler for all UDP sockets */
class NetworkUDPSocketHandler : public NetworkSocketHandler {
protected:
/** The address to bind to. */
NetworkAddressList bind;
/** The opened sockets. */
SocketList sockets;
NetworkRecvStatus CloseConnection(bool error = true) override;
void ReceiveInvalidPacket(PacketUDPType, NetworkAddress *client_addr);
/**
* Queries to the server for information about the game.
* @param p The received packet.
* @param client_addr The origin of the packet.
*/
virtual void Receive_CLIENT_FIND_SERVER(Packet *p, NetworkAddress *client_addr);
/**
* Return of server information to the client.
* This packet has several legacy versions, so we list the version and size of each "field":
*
* Version: Bytes: Description:
* all 1 the version of this packet's structure
*
* 4+ 1 number of GRFs attached (n)
* 4+ n * 20 unique identifier for GRF files. Consists of:
* - one 4 byte variable with the GRF ID
* - 16 bytes (sent sequentially) for the MD5 checksum
* of the GRF
*
* 3+ 4 current game date in days since 1-1-0 (DMY)
* 3+ 4 game introduction date in days since 1-1-0 (DMY)
*
* 2+ 1 maximum number of companies allowed on the server
* 2+ 1 number of companies on the server
* 2+ 1 maximum number of spectators allowed on the server
*
* 1+ var string with the name of the server
* 1+ var string with the revision of the server
* 1+ 1 the language run on the server
* (0 = any, 1 = English, 2 = German, 3 = French)
* 1+ 1 whether the server uses a password (0 = no, 1 = yes)
* 1+ 1 maximum number of clients allowed on the server
* 1+ 1 number of clients on the server
* 1+ 1 number of spectators on the server
* 1 & 2 2 current game date in days since 1-1-1920 (DMY)
* 1 & 2 2 game introduction date in days since 1-1-1920 (DMY)
* 1+ var string with the name of the map
* 1+ 2 width of the map in tiles
* 1+ 2 height of the map in tiles
* 1+ 1 type of map:
* (0 = temperate, 1 = arctic, 2 = desert, 3 = toyland)
* 1+ 1 whether the server is dedicated (0 = no, 1 = yes)
* @param p The received packet.
* @param client_addr The origin of the packet.
*/
virtual void Receive_SERVER_RESPONSE(Packet *p, NetworkAddress *client_addr);
/**
* Query for detailed information about companies.
* @param p The received packet.
* @param client_addr The origin of the packet.
*/
virtual void Receive_CLIENT_DETAIL_INFO(Packet *p, NetworkAddress *client_addr);
/**
* Reply with detailed company information.
* uint8 Version of the packet.
* uint8 Number of companies.
* For each company:
* uint8 ID of the company.
* string Name of the company.
* uint32 Year the company was inaugurated.
* uint64 Value.
* uint64 Money.
* uint64 Income.
* uint16 Performance (last quarter).
* bool Company is password protected.
* uint16 Number of trains.
* uint16 Number of lorries.
* uint16 Number of busses.
* uint16 Number of planes.
* uint16 Number of ships.
* uint16 Number of train stations.
* uint16 Number of lorry stations.
* uint16 Number of bus stops.
* uint16 Number of airports and heliports.
* uint16 Number of harbours.
* bool Company is an AI.
* @param p The received packet.
* @param client_addr The origin of the packet.
*/
virtual void Receive_SERVER_DETAIL_INFO(Packet *p, NetworkAddress *client_addr);
/**
* Registers the server to the master server.
* string The "welcome" message to root out other binary packets.
* uint8 Version of the protocol.
* uint16 The port to unregister.
* uint64 The session key.
* @param p The received packet.
* @param client_addr The origin of the packet.
*/
virtual void Receive_SERVER_REGISTER(Packet *p, NetworkAddress *client_addr);
/**
* The master server acknowledges the registration.
* @param p The received packet.
* @param client_addr The origin of the packet.
*/
virtual void Receive_MASTER_ACK_REGISTER(Packet *p, NetworkAddress *client_addr);
/**
* The client requests a list of servers.
* uint8 The protocol version.
* uint8 The type of server to look for: IPv4, IPv6 or based on the received packet.
* @param p The received packet.
* @param client_addr The origin of the packet.
*/
virtual void Receive_CLIENT_GET_LIST(Packet *p, NetworkAddress *client_addr);
/**
* The server sends a list of servers.
* uint8 The protocol version.
* For each server:
* 4 or 16 bytes of IPv4 or IPv6 address.
* uint8 The port.
* @param p The received packet.
* @param client_addr The origin of the packet.
*/
virtual void Receive_MASTER_RESPONSE_LIST(Packet *p, NetworkAddress *client_addr);
/**
* A server unregisters itself at the master server.
* uint8 Version of the protocol.
* uint16 The port to unregister.
* @param p The received packet.
* @param client_addr The origin of the packet.
*/
virtual void Receive_SERVER_UNREGISTER(Packet *p, NetworkAddress *client_addr);
/**
* The client requests information about some NewGRFs.
* uint8 The number of NewGRFs information is requested about.
* For each NewGRF:
* uint32 The GRFID.
* 16 * uint8 MD5 checksum of the GRF.
* @param p The received packet.
* @param client_addr The origin of the packet.
*/
virtual void Receive_CLIENT_GET_NEWGRFS(Packet *p, NetworkAddress *client_addr);
/**
* The server returns information about some NewGRFs.
* uint8 The number of NewGRFs information is requested about.
* For each NewGRF:
* uint32 The GRFID.
* 16 * uint8 MD5 checksum of the GRF.
* string The name of the NewGRF.
* @param p The received packet.
* @param client_addr The origin of the packet.
*/
virtual void Receive_SERVER_NEWGRFS(Packet *p, NetworkAddress *client_addr);
/**
* The master server sends us a session key.
* uint64 The session key.
* @param p The received packet.
* @param client_addr The origin of the packet.
*/
virtual void Receive_MASTER_SESSION_KEY(Packet *p, NetworkAddress *client_addr);
void HandleUDPPacket(Packet *p, NetworkAddress *client_addr);
/**
* Function that is called for every GRFConfig that is read when receiving
* a NetworkGameInfo. Only grfid and md5sum are set, the rest is zero. This
* function must set all appropriate fields. This GRF is later appended to
* the grfconfig list of the NetworkGameInfo.
* @param config the GRF to handle
*/
virtual void HandleIncomingNetworkGameInfoGRFConfig(GRFConfig *config) { NOT_REACHED(); }
public:
NetworkUDPSocketHandler(NetworkAddressList *bind = nullptr);
/** On destructing of this class, the socket needs to be closed */
virtual ~NetworkUDPSocketHandler() { this->Close(); }
bool Listen();
void Close() override;
void SendPacket(Packet *p, NetworkAddress *recv, bool all = false, bool broadcast = false);
void ReceivePackets();
void SendNetworkGameInfo(Packet *p, const NetworkGameInfo *info);
void ReceiveNetworkGameInfo(Packet *p, NetworkGameInfo *info);
};
#endif /* NETWORK_CORE_UDP_H */
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