/* $Id$ */ /* * 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 network.cpp Base functions for networking support. */ #include "../stdafx.h" #ifdef ENABLE_NETWORK #include "../openttd.h" #include "../strings_func.h" #include "../command_func.h" #include "../date_func.h" #include "network_internal.h" #include "network_client.h" #include "network_server.h" #include "network_content.h" #include "network_udp.h" #include "network_gamelist.h" #include "core/udp.h" #include "core/host.h" #include "network_gui.h" #include "../console_func.h" #include "../3rdparty/md5/md5.h" #include "../core/random_func.hpp" #include "../window_func.h" #include "../company_func.h" #include "../company_base.h" #include "../landscape_type.h" #include "../rev.h" #include "../core/pool_func.hpp" #ifdef DEBUG_DUMP_COMMANDS #include "../fileio_func.h" #endif /* DEBUG_DUMP_COMMANDS */ #include "table/strings.h" DECLARE_POSTFIX_INCREMENT(ClientID); assert_compile(NetworkClientInfoPool::MAX_SIZE == NetworkClientSocketPool::MAX_SIZE); NetworkClientInfoPool _networkclientinfo_pool("NetworkClientInfo"); INSTANTIATE_POOL_METHODS(NetworkClientInfo) bool _networking; ///< are we in networking mode? bool _network_server; ///< network-server is active bool _network_available; ///< is network mode available? bool _network_dedicated; ///< are we a dedicated server? bool _is_network_server; ///< Does this client wants to be a network-server? NetworkServerGameInfo _network_game_info; NetworkCompanyState *_network_company_states = NULL; ClientID _network_own_client_id; ClientID _redirect_console_to_client; bool _network_need_advertise; uint32 _network_last_advertise_frame; uint8 _network_reconnect; StringList _network_bind_list; StringList _network_host_list; StringList _network_ban_list; uint32 _frame_counter_server; // The frame_counter of the server, if in network-mode uint32 _frame_counter_max; // To where we may go with our clients uint32 _frame_counter; uint32 _last_sync_frame; // Used in the server to store the last time a sync packet was sent to clients. NetworkAddressList _broadcast_list; uint32 _sync_seed_1, _sync_seed_2; uint32 _sync_frame; bool _network_first_time; bool _network_udp_server; uint16 _network_udp_broadcast; uint8 _network_advertise_retries; CompanyMask _network_company_passworded; ///< Bitmask of the password status of all companies. /* Check whether NETWORK_NUM_LANDSCAPES is still in sync with NUM_LANDSCAPE */ assert_compile((int)NETWORK_NUM_LANDSCAPES == (int)NUM_LANDSCAPE); assert_compile((int)NETWORK_COMPANY_NAME_LENGTH == MAX_LENGTH_COMPANY_NAME_BYTES); extern NetworkUDPSocketHandler *_udp_client_socket; ///< udp client socket extern NetworkUDPSocketHandler *_udp_server_socket; ///< udp server socket extern NetworkUDPSocketHandler *_udp_master_socket; ///< udp master socket /* The listen socket for the server */ static SocketList _listensockets; /* The amount of clients connected */ static byte _network_clients_connected = 0; /* The identifier counter for new clients (is never decreased) */ static ClientID _network_client_id = CLIENT_ID_FIRST; /* Some externs / forwards */ extern void StateGameLoop(); /** * Basically a client is leaving us right now. */ NetworkClientInfo::~NetworkClientInfo() { /* Delete the chat window, if you were chatting with this client. */ InvalidateWindowData(WC_SEND_NETWORK_MSG, DESTTYPE_CLIENT, this->client_id); } /** * Return the CI given it's raw index * @param index the index to search for * @return return a pointer to the corresponding NetworkClientInfo struct */ NetworkClientInfo *NetworkFindClientInfoFromIndex(ClientIndex index) { return NetworkClientInfo::GetIfValid(index); } /** * Return the CI given it's client-identifier * @param client_id the ClientID to search for * @return return a pointer to the corresponding NetworkClientInfo struct or NULL when not found */ NetworkClientInfo *NetworkFindClientInfoFromClientID(ClientID client_id) { NetworkClientInfo *ci; FOR_ALL_CLIENT_INFOS(ci) { if (ci->client_id == client_id) return ci; } return NULL; } /** * Return the CI for a given IP * @param ip IP of the client we are looking for. This must be in string-format * @return return a pointer to the corresponding NetworkClientInfo struct or NULL when not found */ NetworkClientInfo *NetworkFindClientInfoFromIP(const char *ip) { NetworkClientInfo *ci; NetworkAddress address(ip); if (address.GetAddressLength() == 0) return NULL; FOR_ALL_CLIENT_INFOS(ci) { if (ci->client_address == address) return ci; } return NULL; } /** * Return the client state given it's client-identifier * @param client_id the ClientID to search for * @return return a pointer to the corresponding NetworkClientSocket struct or NULL when not found */ NetworkClientSocket *NetworkFindClientStateFromClientID(ClientID client_id) { NetworkClientSocket *cs; FOR_ALL_CLIENT_SOCKETS(cs) { if (cs->client_id == client_id) return cs; } return NULL; } /* NetworkGetClientName is a server-safe function to get the name of the client * if the user did not send it yet, Client #<no> is used. */ void NetworkGetClientName(char *client_name, size_t size, const NetworkClientSocket *cs) { const NetworkClientInfo *ci = cs->GetInfo(); if (StrEmpty(ci->client_name)) { snprintf(client_name, size, "Client #%4d", cs->client_id); } else { ttd_strlcpy(client_name, ci->client_name, size); } } byte NetworkSpectatorCount() { const NetworkClientInfo *ci; byte count = 0; FOR_ALL_CLIENT_INFOS(ci) { if (ci->client_playas == COMPANY_SPECTATOR) count++; } /* Don't count a dedicated server as spectator */ if (_network_dedicated) count--; return count; } /** * Check if the company we want to join requires a password. * @param company_id id of the company we want to check the 'passworded' flag for. * @return true if the company requires a password. */ bool NetworkCompanyIsPassworded(CompanyID company_id) { return HasBit(_network_company_passworded, company_id); } /* This puts a text-message to the console, or in the future, the chat-box, * (to keep it all a bit more general) * If 'self_send' is true, this is the client who is sending the message */ void NetworkTextMessage(NetworkAction action, ConsoleColour colour, bool self_send, const char *name, const char *str, int64 data) { const int duration = 10; // Game days the messages stay visible StringID strid; switch (action) { case NETWORK_ACTION_SERVER_MESSAGE: /* Ignore invalid messages */ if (data >= NETWORK_SERVER_MESSAGE_END) return; strid = STR_NETWORK_SERVER_MESSAGE; colour = CC_DEFAULT; data = STR_NETWORK_SERVER_MESSAGE_GAME_PAUSED_PLAYERS + data; break; case NETWORK_ACTION_COMPANY_SPECTATOR: colour = CC_DEFAULT; strid = STR_NETWORK_MESSAGE_CLIENT_COMPANY_SPECTATE; break; case NETWORK_ACTION_COMPANY_JOIN: colour = CC_DEFAULT; strid = STR_NETWORK_MESSAGE_CLIENT_COMPANY_JOIN; break; case NETWORK_ACTION_COMPANY_NEW: colour = CC_DEFAULT; strid = STR_NETWORK_MESSAGE_CLIENT_COMPANY_NEW; break; case NETWORK_ACTION_JOIN: /* Show the Client ID for the server but not for the client. */ strid = _network_server ? STR_NETWORK_MESSAGE_CLIENT_JOINED_ID : STR_NETWORK_MESSAGE_CLIENT_JOINED; break; case NETWORK_ACTION_LEAVE: strid = STR_NETWORK_MESSAGE_CLIENT_LEFT; break; case NETWORK_ACTION_NAME_CHANGE: strid = STR_NETWORK_MESSAGE_NAME_CHANGE; break; case NETWORK_ACTION_GIVE_MONEY: strid = self_send ? STR_NETWORK_MESSAGE_GAVE_MONEY_AWAY : STR_NETWORK_MESSAGE_GIVE_MONEY; break; case NETWORK_ACTION_CHAT_COMPANY: strid = self_send ? STR_NETWORK_CHAT_TO_COMPANY : STR_NETWORK_CHAT_COMPANY; break; case NETWORK_ACTION_CHAT_CLIENT: strid = self_send ? STR_NETWORK_CHAT_TO_CLIENT : STR_NETWORK_CHAT_CLIENT; break; default: strid = STR_NETWORK_CHAT_ALL; break; } char message[1024]; SetDParamStr(0, name); SetDParamStr(1, str); SetDParam(2, data); GetString(message, strid, lastof(message)); DEBUG(desync, 1, "msg: %d; %d; %s\n", _date, _date_fract, message); IConsolePrintF(colour, "%s", message); NetworkAddChatMessage((TextColour)colour, duration, "%s", message); } /* Calculate the frame-lag of a client */ uint NetworkCalculateLag(const NetworkClientSocket *cs) { int lag = cs->last_frame_server - cs->last_frame; /* This client has missed his ACK packet after 1 DAY_TICKS.. * so we increase his lag for every frame that passes! * The packet can be out by a max of _net_frame_freq */ if (cs->last_frame_server + DAY_TICKS + _settings_client.network.frame_freq < _frame_counter) lag += _frame_counter - (cs->last_frame_server + DAY_TICKS + _settings_client.network.frame_freq); return lag; } /* There was a non-recoverable error, drop back to the main menu with a nice * error */ static void NetworkError(StringID error_string) { _switch_mode = SM_MENU; extern StringID _switch_mode_errorstr; _switch_mode_errorstr = error_string; } static void ServerStartError(const char *error) { DEBUG(net, 0, "[server] could not start network: %s",error); NetworkError(STR_NETWORK_ERROR_SERVER_START); } static void NetworkClientError(NetworkRecvStatus res, NetworkClientSocket *cs) { /* First, send a CLIENT_ERROR to the server, so he knows we are * disconnection (and why!) */ NetworkErrorCode errorno; /* We just want to close the connection.. */ if (res == NETWORK_RECV_STATUS_CLOSE_QUERY) { cs->NetworkSocketHandler::CloseConnection(); NetworkCloseClient(cs, true); _networking = false; DeleteWindowById(WC_NETWORK_STATUS_WINDOW, 0); return; } switch (res) { case NETWORK_RECV_STATUS_DESYNC: errorno = NETWORK_ERROR_DESYNC; break; case NETWORK_RECV_STATUS_SAVEGAME: errorno = NETWORK_ERROR_SAVEGAME_FAILED; break; case NETWORK_RECV_STATUS_NEWGRF_MISMATCH: errorno = NETWORK_ERROR_NEWGRF_MISMATCH; break; default: errorno = NETWORK_ERROR_GENERAL; break; } /* This means we fucked up and the server closed the connection */ if (res != NETWORK_RECV_STATUS_SERVER_ERROR && res != NETWORK_RECV_STATUS_SERVER_FULL && res != NETWORK_RECV_STATUS_SERVER_BANNED) { SEND_COMMAND(PACKET_CLIENT_ERROR)(errorno); } _switch_mode = SM_MENU; NetworkCloseClient(cs, true); _networking = false; } /** * Retrieve the string id of an internal error number * @param err NetworkErrorCode * @return the StringID */ StringID GetNetworkErrorMsg(NetworkErrorCode err) { /* List of possible network errors, used by * PACKET_SERVER_ERROR and PACKET_CLIENT_ERROR */ static const StringID network_error_strings[] = { STR_NETWORK_ERROR_CLIENT_GENERAL, STR_NETWORK_ERROR_CLIENT_DESYNC, STR_NETWORK_ERROR_CLIENT_SAVEGAME, STR_NETWORK_ERROR_CLIENT_CONNECTION_LOST, STR_NETWORK_ERROR_CLIENT_PROTOCOL_ERROR, STR_NETWORK_ERROR_CLIENT_NEWGRF_MISMATCH, STR_NETWORK_ERROR_CLIENT_NOT_AUTHORIZED, STR_NETWORK_ERROR_CLIENT_NOT_EXPECTED, STR_NETWORK_ERROR_CLIENT_WRONG_REVISION, STR_NETWORK_ERROR_CLIENT_NAME_IN_USE, STR_NETWORK_ERROR_CLIENT_WRONG_PASSWORD, STR_NETWORK_ERROR_CLIENT_COMPANY_MISMATCH, STR_NETWORK_ERROR_CLIENT_KICKED, STR_NETWORK_ERROR_CLIENT_CHEATER, STR_NETWORK_ERROR_CLIENT_SERVER_FULL }; if (err >= (ptrdiff_t)lengthof(network_error_strings)) err = NETWORK_ERROR_GENERAL; return network_error_strings[err]; } /** * Counts the number of active clients connected. * It has to be in STATUS_ACTIVE and not a spectator * @return number of active clients */ static uint NetworkCountActiveClients() { const NetworkClientSocket *cs; uint count = 0; FOR_ALL_CLIENT_SOCKETS(cs) { if (cs->status != STATUS_ACTIVE) continue; if (!Company::IsValidID(cs->GetInfo()->client_playas)) continue; count++; } return count; } /* Check if the minimum number of active clients has been reached and pause or unpause the game as appropriate */ static void CheckMinActiveClients() { if (!_network_dedicated || _settings_client.network.min_active_clients == 0 || (_pause_mode & PM_PAUSED_ERROR) != 0) return; if (NetworkCountActiveClients() < _settings_client.network.min_active_clients) { if ((_pause_mode & PM_PAUSED_NORMAL) != 0) return; DoCommandP(0, PM_PAUSED_NORMAL, 1, CMD_PAUSE); NetworkServerSendChat(NETWORK_ACTION_SERVER_MESSAGE, DESTTYPE_BROADCAST, 0, "", CLIENT_ID_SERVER, NETWORK_SERVER_MESSAGE_GAME_PAUSED_PLAYERS); } else { if ((_pause_mode & PM_PAUSED_NORMAL) == 0) return; DoCommandP(0, PM_PAUSED_NORMAL, 0, CMD_PAUSE); NetworkServerSendChat(NETWORK_ACTION_SERVER_MESSAGE, DESTTYPE_BROADCAST, 0, "", CLIENT_ID_SERVER, NETWORK_SERVER_MESSAGE_GAME_UNPAUSED_PLAYERS); } } /** Converts a string to ip/port/company * Format: IP#company:port * * connection_string will be re-terminated to seperate out the hostname, and company and port will * be set to the company and port strings given by the user, inside the memory area originally * occupied by connection_string. */ void ParseConnectionString(const char **company, const char **port, char *connection_string) { bool ipv6 = (strchr(connection_string, ':') != strrchr(connection_string, ':')); char *p; for (p = connection_string; *p != '\0'; p++) { switch (*p) { case '[': ipv6 = true; break; case ']': ipv6 = false; break; case '#': *company = p + 1; *p = '\0'; break; case ':': if (ipv6) break; *port = p + 1; *p = '\0'; break; } } } /* Creates a new client from a socket * Used both by the server and the client */ static NetworkClientSocket *NetworkAllocClient(SOCKET s) { if (_network_server) { /* Can we handle a new client? */ if (_network_clients_connected >= MAX_CLIENTS) return NULL; if (_network_game_info.clients_on >= _settings_client.network.max_clients) return NULL; /* Register the login */ _network_clients_connected++; } NetworkClientSocket *cs = new NetworkClientSocket(INVALID_CLIENT_ID); cs->sock = s; cs->last_frame = _frame_counter; cs->last_frame_server = _frame_counter; if (_network_server) { cs->client_id = _network_client_id++; NetworkClientInfo *ci = new NetworkClientInfo(cs->client_id); cs->SetInfo(ci); ci->client_playas = COMPANY_INACTIVE_CLIENT; ci->join_date = _date; SetWindowDirty(WC_CLIENT_LIST, 0); } return cs; } /* Close a connection */ void NetworkCloseClient(NetworkClientSocket *cs, bool error) { /* * Sending a message just before leaving the game calls cs->Send_Packets. * This might invoke this function, which means that when we close the * connection after cs->Send_Packets we will close an already closed * connection. This handles that case gracefully without having to make * that code any more complex or more aware of the validity of the socket. */ if (cs->sock == INVALID_SOCKET) return; if (error && !cs->HasClientQuit() && _network_server && cs->status > STATUS_INACTIVE) { /* We did not receive a leave message from this client... */ char client_name[NETWORK_CLIENT_NAME_LENGTH]; NetworkClientSocket *new_cs; NetworkGetClientName(client_name, sizeof(client_name), cs); NetworkTextMessage(NETWORK_ACTION_LEAVE, CC_DEFAULT, false, client_name, NULL, STR_NETWORK_ERROR_CLIENT_CONNECTION_LOST); /* Inform other clients of this... strange leaving ;) */ FOR_ALL_CLIENT_SOCKETS(new_cs) { if (new_cs->status > STATUS_AUTH && cs != new_cs) { SEND_COMMAND(PACKET_SERVER_ERROR_QUIT)(new_cs, cs->client_id, NETWORK_ERROR_CONNECTION_LOST); } } } DEBUG(net, 1, "Closed client connection %d", cs->client_id); /* When the client was PRE_ACTIVE, the server was in pause mode, so unpause */ if (cs->status == STATUS_PRE_ACTIVE && (_pause_mode & PM_PAUSED_JOIN)) { DoCommandP(0, PM_PAUSED_JOIN, 0, CMD_PAUSE); NetworkServerSendChat(NETWORK_ACTION_SERVER_MESSAGE, DESTTYPE_BROADCAST, 0, "", CLIENT_ID_SERVER, NETWORK_SERVER_MESSAGE_GAME_UNPAUSED_CONNECT_FAIL); } if (_network_server) { /* We just lost one client :( */ if (cs->status >= STATUS_AUTH) _network_game_info.clients_on--; _network_clients_connected--; SetWindowDirty(WC_CLIENT_LIST, 0); } delete cs->GetInfo(); delete cs; } /* For the server, to accept new clients */ static void NetworkAcceptClients(SOCKET ls) { for (;;) { struct sockaddr_storage sin; memset(&sin, 0, sizeof(sin)); socklen_t sin_len = sizeof(sin); SOCKET s = accept(ls, (struct sockaddr*)&sin, &sin_len); if (s == INVALID_SOCKET) return; SetNonBlocking(s); // XXX error handling? NetworkAddress address(sin, sin_len); DEBUG(net, 1, "Client connected from %s on frame %d", address.GetHostname(), _frame_counter); SetNoDelay(s); // XXX error handling? /* Check if the client is banned */ bool banned = false; for (char **iter = _network_ban_list.Begin(); iter != _network_ban_list.End(); iter++) { banned = address.IsInNetmask(*iter); if (banned) { Packet p(PACKET_SERVER_BANNED); p.PrepareToSend(); DEBUG(net, 1, "Banned ip tried to join (%s), refused", *iter); send(s, (const char*)p.buffer, p.size, 0); closesocket(s); break; } } /* If this client is banned, continue with next client */ if (banned) continue; NetworkClientSocket *cs = NetworkAllocClient(s); if (cs == NULL) { /* no more clients allowed? * Send to the client that we are full! */ Packet p(PACKET_SERVER_FULL); p.PrepareToSend(); send(s, (const char*)p.buffer, p.size, 0); closesocket(s); continue; } /* a new client has connected. We set him at inactive for now * maybe he is only requesting server-info. Till he has sent a PACKET_CLIENT_MAP_OK * the client stays inactive */ cs->status = STATUS_INACTIVE; cs->GetInfo()->client_address = address; // Save the IP of the client } } /* Set up the listen socket for the server */ static bool NetworkListen() { assert(_listensockets.Length() == 0); NetworkAddressList addresses; GetBindAddresses(&addresses, _settings_client.network.server_port); for (NetworkAddress *address = addresses.Begin(); address != addresses.End(); address++) { address->Listen(SOCK_STREAM, &_listensockets); } if (_listensockets.Length() == 0) { ServerStartError("Could not create listening socket"); return false; } return true; } /** Resets both pools used for network clients */ static void InitializeNetworkPools() { _networkclientsocket_pool.CleanPool(); _networkclientinfo_pool.CleanPool(); } /* Close all current connections */ static void NetworkClose() { NetworkClientSocket *cs; FOR_ALL_CLIENT_SOCKETS(cs) { if (!_network_server) { SEND_COMMAND(PACKET_CLIENT_QUIT)(); cs->Send_Packets(); } NetworkCloseClient(cs, false); } if (_network_server) { /* We are a server, also close the listensocket */ for (SocketList::iterator s = _listensockets.Begin(); s != _listensockets.End(); s++) { closesocket(s->second); } _listensockets.Clear(); DEBUG(net, 1, "[tcp] closed listeners"); } TCPConnecter::KillAll(); _networking = false; _network_server = false; NetworkFreeLocalCommandQueue(); free(_network_company_states); _network_company_states = NULL; InitializeNetworkPools(); } /* Inits the network (cleans sockets and stuff) */ static void NetworkInitialize() { InitializeNetworkPools(); NetworkUDPInitialize(); _sync_frame = 0; _network_first_time = true; _network_reconnect = 0; } /** Non blocking connection create to query servers */ class TCPQueryConnecter : TCPConnecter { public: TCPQueryConnecter(const NetworkAddress &address) : TCPConnecter(address) {} virtual void OnFailure() { NetworkDisconnect(); } virtual void OnConnect(SOCKET s) { _networking = true; NetworkAllocClient(s); SEND_COMMAND(PACKET_CLIENT_COMPANY_INFO)(); } }; /* Query a server to fetch his game-info * If game_info is true, only the gameinfo is fetched, * else only the client_info is fetched */ void NetworkTCPQueryServer(NetworkAddress address) { if (!_network_available) return; NetworkDisconnect(); NetworkInitialize(); new TCPQueryConnecter(address); } /* Validates an address entered as a string and adds the server to * the list. If you use this function, the games will be marked * as manually added. */ void NetworkAddServer(const char *b) { if (*b != '\0') { const char *port = NULL; const char *company = NULL; char host[NETWORK_HOSTNAME_LENGTH]; uint16 rport; strecpy(host, b, lastof(host)); strecpy(_settings_client.network.connect_to_ip, b, lastof(_settings_client.network.connect_to_ip)); rport = NETWORK_DEFAULT_PORT; ParseConnectionString(&company, &port, host); if (port != NULL) rport = atoi(port); NetworkUDPQueryServer(NetworkAddress(host, rport), true); } } /** * Get the addresses to bind to. * @param addresses the list to write to. * @param port the port to bind to. */ void GetBindAddresses(NetworkAddressList *addresses, uint16 port) { for (char **iter = _network_bind_list.Begin(); iter != _network_bind_list.End(); iter++) { *addresses->Append() = NetworkAddress(*iter, port); } /* No address, so bind to everything. */ if (addresses->Length() == 0) { *addresses->Append() = NetworkAddress("", port); } } /* Generates the list of manually added hosts from NetworkGameList and * dumps them into the array _network_host_list. This array is needed * by the function that generates the config file. */ void NetworkRebuildHostList() { _network_host_list.Clear(); for (NetworkGameList *item = _network_game_list; item != NULL; item = item->next) { if (item->manually) *_network_host_list.Append() = strdup(item->address.GetAddressAsString(false)); } } /** Non blocking connection create to actually connect to servers */ class TCPClientConnecter : TCPConnecter { public: TCPClientConnecter(const NetworkAddress &address) : TCPConnecter(address) {} virtual void OnFailure() { NetworkError(STR_NETWORK_ERROR_NOCONNECTION); } virtual void OnConnect(SOCKET s) { _networking = true; NetworkAllocClient(s); IConsoleCmdExec("exec scripts/on_client.scr 0"); NetworkClient_Connected(); } }; /* Used by clients, to connect to a server */ void NetworkClientConnectGame(NetworkAddress address, CompanyID join_as, const char *join_server_password, const char *join_company_password) { if (!_network_available) return; if (address.GetPort() == 0) return; strecpy(_settings_client.network.last_host, address.GetHostname(), lastof(_settings_client.network.last_host)); _settings_client.network.last_port = address.GetPort(); _network_join_as = join_as; _network_join_server_password = join_server_password; _network_join_company_password = join_company_password; NetworkDisconnect(); NetworkInitialize(); _network_join_status = NETWORK_JOIN_STATUS_CONNECTING; ShowJoinStatusWindow(); new TCPClientConnecter(address); } static void NetworkInitGameInfo() { if (StrEmpty(_settings_client.network.server_name)) { snprintf(_settings_client.network.server_name, sizeof(_settings_client.network.server_name), "Unnamed Server"); } /* The server is a client too */ _network_game_info.clients_on = _network_dedicated ? 0 : 1; NetworkClientInfo *ci = new NetworkClientInfo(CLIENT_ID_SERVER); ci->client_playas = _network_dedicated ? COMPANY_SPECTATOR : _local_company; /* Give the server a valid IP; banning it is pointless anyways */ sockaddr_in sock; memset(&sock, 0, sizeof(sock)); sock.sin_family = AF_INET; ci->client_address = NetworkAddress((sockaddr*)&sock, sizeof(sock)); strecpy(ci->client_name, _settings_client.network.client_name, lastof(ci->client_name)); strecpy(ci->unique_id, _settings_client.network.network_id, lastof(ci->unique_id)); } bool NetworkServerStart() { if (!_network_available) return false; /* Call the pre-scripts */ IConsoleCmdExec("exec scripts/pre_server.scr 0"); if (_network_dedicated) IConsoleCmdExec("exec scripts/pre_dedicated.scr 0"); NetworkDisconnect(); NetworkInitialize(); if (!NetworkListen()) return false; /* Try to start UDP-server */ _network_udp_server = _udp_server_socket->Listen(); _network_company_states = CallocT<NetworkCompanyState>(MAX_COMPANIES); _network_server = true; _networking = true; _frame_counter = 0; _frame_counter_server = 0; _frame_counter_max = 0; _last_sync_frame = 0; _network_own_client_id = CLIENT_ID_SERVER; _network_clients_connected = 0; _network_company_passworded = 0; NetworkInitGameInfo(); /* execute server initialization script */ IConsoleCmdExec("exec scripts/on_server.scr 0"); /* if the server is dedicated ... add some other script */ if (_network_dedicated) IConsoleCmdExec("exec scripts/on_dedicated.scr 0"); /* Try to register us to the master server */ _network_last_advertise_frame = 0; _network_need_advertise = true; NetworkUDPAdvertise(); return true; } /* The server is rebooting... * The only difference with NetworkDisconnect, is the packets that is sent */ void NetworkReboot() { if (_network_server) { NetworkClientSocket *cs; FOR_ALL_CLIENT_SOCKETS(cs) { SEND_COMMAND(PACKET_SERVER_NEWGAME)(cs); cs->Send_Packets(); } } NetworkClose(); } /** * We want to disconnect from the host/clients. * @param blocking whether to wait till everything has been closed */ void NetworkDisconnect(bool blocking) { if (_network_server) { NetworkClientSocket *cs; FOR_ALL_CLIENT_SOCKETS(cs) { SEND_COMMAND(PACKET_SERVER_SHUTDOWN)(cs); cs->Send_Packets(); } } if (_settings_client.network.server_advertise) NetworkUDPRemoveAdvertise(blocking); DeleteWindowById(WC_NETWORK_STATUS_WINDOW, 0); NetworkClose(); } /* Receives something from the network */ static bool NetworkReceive() { NetworkClientSocket *cs; fd_set read_fd, write_fd; struct timeval tv; FD_ZERO(&read_fd); FD_ZERO(&write_fd); FOR_ALL_CLIENT_SOCKETS(cs) { FD_SET(cs->sock, &read_fd); FD_SET(cs->sock, &write_fd); } /* take care of listener port */ for (SocketList::iterator s = _listensockets.Begin(); s != _listensockets.End(); s++) { FD_SET(s->second, &read_fd); } tv.tv_sec = tv.tv_usec = 0; // don't block at all. #if !defined(__MORPHOS__) && !defined(__AMIGA__) int n = select(FD_SETSIZE, &read_fd, &write_fd, NULL, &tv); #else int n = WaitSelect(FD_SETSIZE, &read_fd, &write_fd, NULL, &tv, NULL); #endif if (n == -1 && !_network_server) NetworkError(STR_NETWORK_ERROR_LOSTCONNECTION); /* accept clients.. */ for (SocketList::iterator s = _listensockets.Begin(); s != _listensockets.End(); s++) { if (FD_ISSET(s->second, &read_fd)) NetworkAcceptClients(s->second); } /* read stuff from clients */ FOR_ALL_CLIENT_SOCKETS(cs) { cs->writable = !!FD_ISSET(cs->sock, &write_fd); if (FD_ISSET(cs->sock, &read_fd)) { if (_network_server) { NetworkServer_ReadPackets(cs); } else { NetworkRecvStatus res; /* The client already was quiting! */ if (cs->HasClientQuit()) return false; res = NetworkClient_ReadPackets(cs); if (res != NETWORK_RECV_STATUS_OKAY) { /* The client made an error of which we can not recover * close the client and drop back to main menu */ NetworkClientError(res, cs); return false; } } } } return true; } /* This sends all buffered commands (if possible) */ static void NetworkSend() { NetworkClientSocket *cs; FOR_ALL_CLIENT_SOCKETS(cs) { if (cs->writable) { cs->Send_Packets(); if (cs->status == STATUS_MAP) { /* This client is in the middle of a map-send, call the function for that */ SEND_COMMAND(PACKET_SERVER_MAP)(cs); } } } } static bool NetworkDoClientLoop() { _frame_counter++; NetworkExecuteLocalCommandQueue(); StateGameLoop(); /* Check if we are in sync! */ if (_sync_frame != 0) { if (_sync_frame == _frame_counter) { #ifdef NETWORK_SEND_DOUBLE_SEED if (_sync_seed_1 != _random.state[0] || _sync_seed_2 != _random.state[1]) { #else if (_sync_seed_1 != _random.state[0]) { #endif NetworkError(STR_NETWORK_ERROR_DESYNC); DEBUG(desync, 1, "sync_err: %d; %d\n", _date, _date_fract); DEBUG(net, 0, "Sync error detected!"); NetworkClientError(NETWORK_RECV_STATUS_DESYNC, NetworkClientSocket::Get(0)); return false; } /* If this is the first time we have a sync-frame, we * need to let the server know that we are ready and at the same * frame as he is.. so we can start playing! */ if (_network_first_time) { _network_first_time = false; SEND_COMMAND(PACKET_CLIENT_ACK)(); } _sync_frame = 0; } else if (_sync_frame < _frame_counter) { DEBUG(net, 1, "Missed frame for sync-test (%d / %d)", _sync_frame, _frame_counter); _sync_frame = 0; } } return true; } /* We have to do some UDP checking */ void NetworkUDPGameLoop() { _network_content_client.SendReceive(); TCPConnecter::CheckCallbacks(); if (_network_udp_server) { _udp_server_socket->ReceivePackets(); _udp_master_socket->ReceivePackets(); } else { _udp_client_socket->ReceivePackets(); if (_network_udp_broadcast > 0) _network_udp_broadcast--; NetworkGameListRequery(); } } /* The main loop called from ttd.c * Here we also have to do StateGameLoop if needed! */ void NetworkGameLoop() { if (!_networking) return; if (!NetworkReceive()) return; if (_network_server) { #ifdef DEBUG_DUMP_COMMANDS static FILE *f = FioFOpenFile("commands.log", "rb", SAVE_DIR); static Date next_date = 0; static uint32 next_date_fract; static CommandPacket *cp = NULL; if (f == NULL && next_date == 0) { printf("Cannot open commands.log\n"); next_date = 1; } while (f != NULL && !feof(f)) { if (cp != NULL && _date == next_date && _date_fract == next_date_fract) { _current_company = cp->company; DoCommandP(cp->tile, cp->p1, cp->p2, cp->cmd, NULL, cp->text); free(cp); cp = NULL; } if (cp != NULL) break; char buff[4096]; if (fgets(buff, lengthof(buff), f) == NULL) break; if (strncmp(buff, "cmd: ", 8) != 0) continue; cp = MallocT<CommandPacket>(1); int company; sscanf(&buff[8], "%d; %d; %d; %d; %d; %d; %d; %s", &next_date, &next_date_fract, &company, &cp->tile, &cp->p1, &cp->p2, &cp->cmd, cp->text); cp->company = (CompanyID)company; } #endif /* DEBUG_DUMP_COMMANDS */ if (_frame_counter >= _frame_counter_max) { /* Only check for active clients just before we're going to send out * the commands so we don't send multiple pause/unpause commands when * the frame_freq is more than 1 tick. */ CheckMinActiveClients(); } bool send_frame = false; /* We first increase the _frame_counter */ _frame_counter++; /* Update max-frame-counter */ if (_frame_counter > _frame_counter_max) { _frame_counter_max = _frame_counter + _settings_client.network.frame_freq; send_frame = true; } NetworkExecuteLocalCommandQueue(); /* Then we make the frame */ StateGameLoop(); _sync_seed_1 = _random.state[0]; #ifdef NETWORK_SEND_DOUBLE_SEED _sync_seed_2 = _random.state[1]; #endif NetworkServer_Tick(send_frame); } else { /* Client */ /* Make sure we are at the frame were the server is (quick-frames) */ if (_frame_counter_server > _frame_counter) { while (_frame_counter_server > _frame_counter) { if (!NetworkDoClientLoop()) break; } } else { /* Else, keep on going till _frame_counter_max */ if (_frame_counter_max > _frame_counter) NetworkDoClientLoop(); } } NetworkSend(); } static void NetworkGenerateUniqueId() { Md5 checksum; uint8 digest[16]; char hex_output[16 * 2 + 1]; char coding_string[NETWORK_NAME_LENGTH]; int di; snprintf(coding_string, sizeof(coding_string), "%d%s", (uint)Random(), "OpenTTD Unique ID"); /* Generate the MD5 hash */ checksum.Append((const uint8*)coding_string, strlen(coding_string)); checksum.Finish(digest); for (di = 0; di < 16; ++di) { sprintf(hex_output + di * 2, "%02x", digest[di]); } /* _network_unique_id is our id */ snprintf(_settings_client.network.network_id, sizeof(_settings_client.network.network_id), "%s", hex_output); } void NetworkStartDebugLog(NetworkAddress address) { extern SOCKET _debug_socket; // Comes from debug.c DEBUG(net, 0, "Redirecting DEBUG() to %s:%d", address.GetHostname(), address.GetPort()); SOCKET s = address.Connect(); if (s == INVALID_SOCKET) { DEBUG(net, 0, "Failed to open socket for redirection DEBUG()"); return; } _debug_socket = s; DEBUG(net, 0, "DEBUG() is now redirected"); } /** This tries to launch the network for a given OS */ void NetworkStartUp() { DEBUG(net, 3, "[core] starting network..."); /* Network is available */ _network_available = NetworkCoreInitialize();; _network_dedicated = false; _network_last_advertise_frame = 0; _network_need_advertise = true; _network_advertise_retries = 0; /* Generate an unique id when there is none yet */ if (StrEmpty(_settings_client.network.network_id)) NetworkGenerateUniqueId(); memset(&_network_game_info, 0, sizeof(_network_game_info)); NetworkInitialize(); DEBUG(net, 3, "[core] network online, multiplayer available"); NetworkFindBroadcastIPs(&_broadcast_list); } /** This shuts the network down */ void NetworkShutDown() { NetworkDisconnect(true); NetworkUDPClose(); DEBUG(net, 3, "[core] shutting down network"); _network_available = false; NetworkCoreShutdown(); } /** * Checks whether the given version string is compatible with our version. * @param other the version string to compare to */ bool IsNetworkCompatibleVersion(const char *other) { return strncmp(_openttd_revision, other, NETWORK_REVISION_LENGTH - 1) == 0; } #endif /* ENABLE_NETWORK */