/******************************************************************************\ * Copyright (c) 2004-2019 * * Author(s): * Volker Fischer * ****************************************************************************** * * 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, write to the Free Software Foundation, Inc., * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * \******************************************************************************/ #include "serverlist.h" /* Implementation *************************************************************/ CServerListManager::CServerListManager ( const quint16 iNPortNum, const QString& sNCentServAddr, const QString& strServerInfo, const int iNumChannels, const bool bNCentServPingServerInList, CProtocol* pNConLProt ) : iPortNumber ( iNPortNum ), iNumPredefinedServers ( 0 ), bUseDefaultCentralServerAddress ( false ), // must be false for the "no GUI" case bCentServPingServerInList ( bNCentServPingServerInList ), pConnLessProtocol ( pNConLProt ) { // set the central server address SetCentralServerAddress ( sNCentServAddr ); // prepare the server info information QStringList slServInfoSeparateParams; int iServInfoNumSplitItems = 0; if ( !strServerInfo.isEmpty() ) { // split the different parameter strings slServInfoSeparateParams = strServerInfo.split ( ";" ); // get the number of items in the split list iServInfoNumSplitItems = slServInfoSeparateParams.count(); } // per definition, the very first entry is this server and this entry will // never be deleted ServerList.clear(); // Init server list entry (server info for this server) with defaults. Per // definition the client substitudes the IP address of the central server // itself for his server list. If we are the central server, we assume that // we have a permanent server. CServerListEntry ThisServerListEntry ( CHostAddress(), iPortNumber, "", "", QLocale::system().country(), "", iNumChannels, GetIsCentralServer() ); // parse the server info string according to definition: // [this server name];[this server city]; ... // [this server country as QLocale ID]; ... // per definition, we expect at least three parameters if ( iServInfoNumSplitItems >= 3 ) { // [this server name] ThisServerListEntry.strName = slServInfoSeparateParams[0]; // [this server city] ThisServerListEntry.strCity = slServInfoSeparateParams[1]; // [this server country as QLocale ID] const int iCountry = slServInfoSeparateParams[2].toInt(); if ( ( iCountry >= 0 ) && ( iCountry <= QLocale::LastCountry ) ) { ThisServerListEntry.eCountry = static_cast ( iCountry ); } } // per definition, the first entry in the server list is the own server ServerList.append ( ThisServerListEntry ); // parse the predefined server infos (if any) according to definition: // [server1 address];[server1 name];[server1 city]; ... // [server1 country as QLocale ID]; ... // [server2 address];[server2 name];[server2 city]; ... // [server2 country as QLocale ID]; ... // ... int iCurUsedServInfoSplitItems = 3; // three items are used for this server // we always expect four items per new server, also check for maximum // allowed number of servers in the server list while ( ( iServInfoNumSplitItems - iCurUsedServInfoSplitItems >= 4 ) && ( iNumPredefinedServers <= MAX_NUM_SERVERS_IN_SERVER_LIST ) ) { // create a new server list entry, we assume that servers which are // registered via the command line are permanent servers CServerListEntry NewServerListEntry ( CHostAddress(), 0, // port number not used "", "", QLocale::AnyCountry, "", iNumChannels, true ); // [server n address] NetworkUtil().ParseNetworkAddress ( slServInfoSeparateParams[iCurUsedServInfoSplitItems], NewServerListEntry.HostAddr ); // [server n name] NewServerListEntry.strName = slServInfoSeparateParams[iCurUsedServInfoSplitItems + 1]; // [server n city] NewServerListEntry.strCity = slServInfoSeparateParams[iCurUsedServInfoSplitItems + 2]; // [server n country as QLocale ID] const int iCountry = slServInfoSeparateParams[iCurUsedServInfoSplitItems + 3].toInt(); if ( ( iCountry >= 0 ) && ( iCountry <= QLocale::LastCountry ) ) { NewServerListEntry.eCountry = static_cast ( iCountry ); } // add the new server to the server list ServerList.append ( NewServerListEntry ); // we have used four items and have created one predefined server // (adjust counters) iCurUsedServInfoSplitItems += 4; iNumPredefinedServers++; } // for slave servers start the one shot timer for determining if it is a // permanent server if ( !GetIsCentralServer() ) { // 1 minute = 60 * 1000 ms QTimer::singleShot ( SERVLIST_TIME_PERMSERV_MINUTES * 60000, this, SLOT ( OnTimerIsPermanent() ) ); } // Connections ------------------------------------------------------------- QObject::connect ( &TimerPollList, SIGNAL ( timeout() ), this, SLOT ( OnTimerPollList() ) ); QObject::connect ( &TimerPingServerInList, SIGNAL ( timeout() ), this, SLOT ( OnTimerPingServerInList() ) ); QObject::connect ( &TimerPingCentralServer, SIGNAL ( timeout() ), this, SLOT ( OnTimerPingCentralServer() ) ); QObject::connect ( &TimerRegistering, SIGNAL ( timeout() ), this, SLOT ( OnTimerRegistering() ) ); } void CServerListManager::SetCentralServerAddress ( const QString sNCentServAddr ) { QMutexLocker locker ( &Mutex ); strCentralServerAddress = sNCentServAddr; // per definition: If the central server address is empty, the server list // is disabled. // per definition: If we are in server mode and the central server address // is the localhost address, we are in central server mode. For the central // server, the server list is always enabled. if ( !strCentralServerAddress.isEmpty() ) { bIsCentralServer = ( ( !strCentralServerAddress.toLower().compare ( "localhost" ) || !strCentralServerAddress.compare ( "127.0.0.1" ) ) && ( !bUseDefaultCentralServerAddress ) ); bEnabled = true; } else { bIsCentralServer = false; bEnabled = false; } } void CServerListManager::Update() { QMutexLocker locker ( &Mutex ); if ( bEnabled ) { if ( bIsCentralServer ) { // start timer for polling the server list if enabled // 1 minute = 60 * 1000 ms TimerPollList.start ( SERVLIST_POLL_TIME_MINUTES * 60000 ); if ( bCentServPingServerInList ) { // start timer for sending ping messages to servers in the list TimerPingServerInList.start ( SERVLIST_UPDATE_PING_SERVERS_MS ); } } else { // initiate registration right away so that we do not have to wait // for the first time out of the timer until the slave server gets // registered at the central server, note that we have to unlock // the mutex before calling the function since inside this function // the mutex is locked, too locker.unlock(); { OnTimerRegistering(); } locker.relock(); // start timer for registering this server at the central server // 1 minute = 60 * 1000 ms TimerRegistering.start ( SERVLIST_REGIST_INTERV_MINUTES * 60000 ); // Start timer for ping the central server in short intervals to // keep the port open at the NAT router. // If no NAT is used, we send the messages anyway since they do // not hurt (very low traffic). We also reuse the same update // time as used in the central server for pinging the slave // servers. TimerPingCentralServer.start ( SERVLIST_UPDATE_PING_SERVERS_MS ); } } else { // disable service -> stop timer if ( bIsCentralServer ) { TimerPollList.stop(); if ( bCentServPingServerInList ) { TimerPingServerInList.stop(); } } else { TimerRegistering.stop(); TimerPingCentralServer.stop(); } } } /* Central server functionality ***********************************************/ void CServerListManager::OnTimerPingServerInList() { QMutexLocker locker ( &Mutex ); const int iCurServerListSize = ServerList.size(); // send ping to list entries except of the very first one (which is the central // server entry) and the predefined servers for ( int iIdx = 1 + iNumPredefinedServers; iIdx < iCurServerListSize; iIdx++ ) { // send empty message to keep NAT port open at slave server pConnLessProtocol->CreateCLEmptyMes ( ServerList[iIdx].HostAddr ); } } void CServerListManager::OnTimerPollList() { QMutexLocker locker ( &Mutex ); // Check all list entries except of the very first one (which is the central // server entry) and the predefined servers if they are still valid. // Note that we have to use "ServerList.size()" function in the for loop // since we may remove elements from the server list inside the for loop. for ( int iIdx = 1 + iNumPredefinedServers; iIdx < ServerList.size(); iIdx++ ) { // 1 minute = 60 * 1000 ms if ( ServerList[iIdx].RegisterTime.elapsed() > ( SERVLIST_TIME_OUT_MINUTES * 60000 ) ) { // remove this list entry ServerList.removeAt ( iIdx ); } } } void CServerListManager::CentralServerRegisterServer ( const CHostAddress& InetAddr, const CServerCoreInfo& ServerInfo ) { QMutexLocker locker ( &Mutex ); if ( bIsCentralServer && bEnabled ) { const int iCurServerListSize = ServerList.size(); // check for maximum allowed number of servers in the server list if ( iCurServerListSize < MAX_NUM_SERVERS_IN_SERVER_LIST ) { // define invalid index used as a flag const int ciInvalidIdx = -1; // Check if server is already registered. Use address to identify // a server. The very first list entry must not be checked since // this is per definition the central server (i.e., this server) int iSelIdx = ciInvalidIdx; // initialize with an illegal value for ( int iIdx = 1; iIdx < iCurServerListSize; iIdx++ ) { if ( ServerList[iIdx].HostAddr == InetAddr ) { // store entry index iSelIdx = iIdx; // entry found, leave for-loop continue; } } // if server is not yet registered, we have to create a new entry if ( iSelIdx == ciInvalidIdx ) { // create a new server list entry and init with received data ServerList.append ( CServerListEntry ( InetAddr, ServerInfo ) ); } else { // do not update the information in the predefined servers if ( iSelIdx > iNumPredefinedServers ) { // update all data and call update registration function ServerList[iSelIdx].iLocalPortNumber = ServerInfo.iLocalPortNumber; ServerList[iSelIdx].strName = ServerInfo.strName; ServerList[iSelIdx].strTopic = ServerInfo.strTopic; ServerList[iSelIdx].eCountry = ServerInfo.eCountry; ServerList[iSelIdx].strCity = ServerInfo.strCity; ServerList[iSelIdx].iMaxNumClients = ServerInfo.iMaxNumClients; ServerList[iSelIdx].bPermanentOnline = ServerInfo.bPermanentOnline; ServerList[iSelIdx].UpdateRegistration(); } } } } } void CServerListManager::CentralServerUnregisterServer ( const CHostAddress& InetAddr ) { QMutexLocker locker ( &Mutex ); if ( bIsCentralServer && bEnabled ) { const int iCurServerListSize = ServerList.size(); // Find the server to unregister in the list. The very first list entry // must not be checked since this is per definition the central server // (i.e., this server), also the predefined servers must not be checked. for ( int iIdx = 1 + iNumPredefinedServers; iIdx < iCurServerListSize; iIdx++ ) { if ( ServerList[iIdx].HostAddr == InetAddr ) { // remove this list entry ServerList.removeAt ( iIdx ); // entry found, leave for-loop (it is important to exit the // for loop since when we remove an item from the server list, // "iCurServerListSize" is not correct anymore and we could get // a segmentation fault) break; } } } } void CServerListManager::CentralServerQueryServerList ( const CHostAddress& InetAddr ) { QMutexLocker locker ( &Mutex ); if ( bIsCentralServer && bEnabled ) { const int iCurServerListSize = ServerList.size(); // allocate memory for the entire list CVector vecServerInfo ( iCurServerListSize ); // copy the list (we have to copy it since the message requires // a vector but the list is actually stored in a QList object and // not in a vector object for ( int iIdx = 0; iIdx < iCurServerListSize; iIdx++ ) { // copy list item vecServerInfo[iIdx] = ServerList[iIdx]; if ( iIdx > 0 ) { // check if the address of the client which is requesting the // list is the same address as one server in the list -> in this // case he has to connect to the local host address if ( vecServerInfo[iIdx].HostAddr.InetAddr == InetAddr.InetAddr ) { vecServerInfo[iIdx].HostAddr.InetAddr = QHostAddress ( QHostAddress::LocalHost ); // take the local port number instead of the received port // number since some NAT (network address translation) might // have changed the port, note that the predefined servers // are treated differently, for these we assume that the // received port number is the same as the actual port // number if ( iIdx > iNumPredefinedServers ) { vecServerInfo[iIdx].HostAddr.iPort = ServerList[iIdx].iLocalPortNumber; } } else { // create "send empty message" for all registered servers // (except of the very first list entry since this is this // server (central server) per definition) and also it is // not required to send this message, if the server is on // the same computer pConnLessProtocol->CreateCLSendEmptyMesMes ( vecServerInfo[iIdx].HostAddr, InetAddr ); } } } // send the server list to the client pConnLessProtocol->CreateCLServerListMes ( InetAddr, vecServerInfo ); } } /* Slave server functionality *************************************************/ void CServerListManager::OnTimerPingCentralServer() { QMutexLocker locker ( &Mutex ); // first check if central server address is valid if ( !( SlaveCurCentServerHostAddress == CHostAddress() ) ) { // send empty message to central server to keep NAT port open -> we do // not require any answer from the central server pConnLessProtocol->CreateCLEmptyMes ( SlaveCurCentServerHostAddress ); } } void CServerListManager::SlaveServerRegisterServer ( const bool bIsRegister ) { // we need the lock since the user might change the server properties at // any time QMutexLocker locker ( &Mutex ); // get the correct central server address const QString strCurCentrServAddr = SELECT_SERVER_ADDRESS ( bUseDefaultCentralServerAddress, strCentralServerAddress ); // For the slave server, the slave server properties are stored in the // very first item in the server list (which is actually no server list // but just one item long for the slave server). // Note that we always have to parse the server address again since if // it is an URL of a dynamic IP address, the IP address might have // changed in the meanwhile. if ( NetworkUtil().ParseNetworkAddress ( strCurCentrServAddr, SlaveCurCentServerHostAddress ) ) { if ( bIsRegister ) { // register server pConnLessProtocol->CreateCLRegisterServerMes ( SlaveCurCentServerHostAddress, ServerList[0] ); } else { // unregister server pConnLessProtocol->CreateCLUnregisterServerMes ( SlaveCurCentServerHostAddress ); } } }