/*===================================================================== QGroundControl Open Source Ground Control Station (c) 2009 - 2015 QGROUNDCONTROL PROJECT This file is part of the QGROUNDCONTROL project QGROUNDCONTROL 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 3 of the License, or (at your option) any later version. QGROUNDCONTROL 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 QGROUNDCONTROL. If not, see . ======================================================================*/ /** * @file * @brief Definition of UDP connection (server) for unmanned vehicles * @author Lorenz Meier * */ #include #if QT_VERSION > 0x050401 #define UDP_BROKEN_SIGNAL 1 #else #define UDP_BROKEN_SIGNAL 0 #endif #include #include #include #include #include #include #include #include "UDPLink.h" #include "QGC.h" #include #define REMOVE_GONE_HOSTS 0 static const char* kZeroconfRegistration = "_qgroundcontrol._udp"; static bool is_ip(const QString& address) { int a,b,c,d; if (sscanf(address.toStdString().c_str(), "%d.%d.%d.%d", &a, &b, &c, &d) != 4 && strcmp("::1", address.toStdString().c_str())) { return false; } else { return true; } } static QString get_ip_address(const QString& address) { if(is_ip(address)) return address; // Need to look it up QHostInfo info = QHostInfo::fromName(address); if (info.error() == QHostInfo::NoError) { QList hostAddresses = info.addresses(); QHostAddress address; for (int i = 0; i < hostAddresses.size(); i++) { // Exclude all IPv6 addresses if (!hostAddresses.at(i).toString().contains(":")) { return hostAddresses.at(i).toString(); } } } return QString(""); } UDPLink::UDPLink(UDPConfiguration* config) : _socket(NULL) , _connectState(false) #if defined(QGC_ZEROCONF_ENABLED) , _dnssServiceRef(NULL) #endif , _running(false) { Q_ASSERT(config != NULL); _config = config; _config->setLink(this); // We're doing it wrong - because the Qt folks got the API wrong: // http://blog.qt.digia.com/blog/2010/06/17/youre-doing-it-wrong/ moveToThread(this); //qDebug() << "UDP Created " << _config->name(); } UDPLink::~UDPLink() { // Disconnect link from configuration _config->setLink(NULL); _disconnect(); // Tell the thread to exit _running = false; quit(); // Wait for it to exit wait(); while(_outQueue.count() > 0) { delete _outQueue.dequeue(); } this->deleteLater(); } /** * @brief Runs the thread * **/ void UDPLink::run() { if(_hardwareConnect()) { if(UDP_BROKEN_SIGNAL) { bool loop = false; while(true) { //-- Anything to read? loop = _socket->hasPendingDatagrams(); if(loop) { readBytes(); } //-- Loop right away if busy if((_dequeBytes() || loop) && _running) continue; if(!_running) break; //-- Settle down (it gets here if there is nothing to read or write) this->msleep(50); } } else { exec(); } } if (_socket) { _deregisterZeroconf(); _socket->close(); } } void UDPLink::_restartConnection() { if(this->isConnected()) { _disconnect(); _connect(); } } QString UDPLink::getName() const { return _config->name(); } void UDPLink::addHost(const QString& host) { _config->addHost(host); } void UDPLink::removeHost(const QString& host) { _config->removeHost(host); } void UDPLink::writeBytes(const char* data, qint64 size) { if (!_socket) { return; } if(UDP_BROKEN_SIGNAL) { QByteArray* qdata = new QByteArray(data, size); QMutexLocker lock(&_mutex); _outQueue.enqueue(qdata); } else { _sendBytes(data, size); } } bool UDPLink::_dequeBytes() { QMutexLocker lock(&_mutex); if(_outQueue.count() > 0) { QByteArray* qdata = _outQueue.dequeue(); lock.unlock(); _sendBytes(qdata->data(), qdata->size()); delete qdata; lock.relock(); } return (_outQueue.count() > 0); } void UDPLink::_sendBytes(const char* data, qint64 size) { QStringList goneHosts; // Send to all connected systems QString host; int port; if(_config->firstHost(host, port)) { do { QHostAddress currentHost(host); if(_socket->writeDatagram(data, size, currentHost, (quint16)port) < 0) { // This host is gone. Add to list to be removed // We should keep track of hosts that were manually added (static) and // hosts that were added because we heard from them (dynamic). Only // dynamic hosts should be removed and even then, after a few tries, not // the first failure. In the mean time, we don't remove anything. if(REMOVE_GONE_HOSTS) { goneHosts.append(host); } } else { // Only log rate if data actually got sent. Not sure about this as // "host not there" takes time too regardless of size of data. In fact, // 1 byte or "UDP frame size" bytes are the same as that's the data // unit sent by UDP. _logOutputDataRate(size, QDateTime::currentMSecsSinceEpoch()); } } while (_config->nextHost(host, port)); //-- Remove hosts that are no longer there foreach (QString ghost, goneHosts) { _config->removeHost(ghost); } } } /** * @brief Read a number of bytes from the interface. **/ void UDPLink::readBytes() { while (_socket->hasPendingDatagrams()) { QByteArray datagram; datagram.resize(_socket->pendingDatagramSize()); QHostAddress sender; quint16 senderPort; _socket->readDatagram(datagram.data(), datagram.size(), &sender, &senderPort); // FIXME TODO Check if this method is better than retrieving the data by individual processes emit bytesReceived(this, datagram); _logInputDataRate(datagram.length(), QDateTime::currentMSecsSinceEpoch()); // // Echo data for debugging purposes // std::cerr << __FILE__ << __LINE__ << "Received datagram:" << std::endl; // int i; // for (i=0; iaddHost(sender.toString(), (int)senderPort); if(UDP_BROKEN_SIGNAL && !_running) break; } } /** * @brief Disconnect the connection. * * @return True if connection has been disconnected, false if connection couldn't be disconnected. **/ bool UDPLink::_disconnect(void) { _running = false; quit(); wait(); if (_socket) { // Make sure delete happen on correct thread _socket->deleteLater(); _socket = NULL; emit disconnected(); } _connectState = false; return true; } /** * @brief Connect the connection. * * @return True if connection has been established, false if connection couldn't be established. **/ bool UDPLink::_connect(void) { if(this->isRunning() || _running) { _running = false; quit(); wait(); } _running = true; start(NormalPriority); return true; } bool UDPLink::_hardwareConnect() { if (_socket) { delete _socket; _socket = NULL; } QHostAddress host = QHostAddress::AnyIPv4; _socket = new QUdpSocket(); _socket->setProxy(QNetworkProxy::NoProxy); _connectState = _socket->bind(host, _config->localPort(), QAbstractSocket::ReuseAddressHint | QUdpSocket::ShareAddress); if (_connectState) { _registerZeroconf(_config->localPort(), kZeroconfRegistration); //-- Connect signal if this version of Qt is not broken if(!UDP_BROKEN_SIGNAL) { QObject::connect(_socket, SIGNAL(readyRead()), this, SLOT(readBytes())); } emit connected(); } else { emit communicationError("UDP Link Error", "Error binding UDP port"); } return _connectState; } /** * @brief Check if connection is active. * * @return True if link is connected, false otherwise. **/ bool UDPLink::isConnected() const { return _connectState; } qint64 UDPLink::getConnectionSpeed() const { return 54000000; // 54 Mbit } qint64 UDPLink::getCurrentInDataRate() const { return 0; } qint64 UDPLink::getCurrentOutDataRate() const { return 0; } void UDPLink::_registerZeroconf(uint16_t port, const std::string ®Type) { #if defined(QGC_ZEROCONF_ENABLED) DNSServiceErrorType result = DNSServiceRegister(&_dnssServiceRef, 0, 0, 0, regType.c_str(), NULL, NULL, htons(port), 0, NULL, NULL, NULL); if (result != kDNSServiceErr_NoError) { emit communicationError("UDP Link Error", "Error registering Zeroconf"); _dnssServiceRef = NULL; } #else Q_UNUSED(port); Q_UNUSED(regType); #endif } void UDPLink::_deregisterZeroconf() { #if defined(QGC_ZEROCONF_ENABLED) if (_dnssServiceRef) { DNSServiceRefDeallocate(_dnssServiceRef); _dnssServiceRef = NULL; } #endif } //-------------------------------------------------------------------------- //-- UDPConfiguration UDPConfiguration::UDPConfiguration(const QString& name) : LinkConfiguration(name) { _localPort = QGC_UDP_LOCAL_PORT; } UDPConfiguration::UDPConfiguration(UDPConfiguration* source) : LinkConfiguration(source) { _localPort = source->localPort(); _hosts.clear(); QString host; int port; if(source->firstHost(host, port)) { do { addHost(host, port); } while(source->nextHost(host, port)); } } void UDPConfiguration::copyFrom(LinkConfiguration *source) { LinkConfiguration::copyFrom(source); UDPConfiguration* usource = dynamic_cast(source); Q_ASSERT(usource != NULL); _localPort = usource->localPort(); _hosts.clear(); QString host; int port; if(usource->firstHost(host, port)) { do { addHost(host, port); } while(usource->nextHost(host, port)); } } /** * @param host Hostname in standard formatt, e.g. localhost:14551 or 192.168.1.1:14551 */ void UDPConfiguration::addHost(const QString& host) { // Handle x.x.x.x:p if (host.contains(":")) { addHost(host.split(":").first(), host.split(":").last().toInt()); } // If no port, use default else { addHost(host, (int)_localPort); } } void UDPConfiguration::addHost(const QString& host, int port) { QMutexLocker locker(&_confMutex); if(_hosts.contains(host)) { if(_hosts[host] != port) { _hosts[host] = port; } } else { QString ipAdd = get_ip_address(host); if(ipAdd.isEmpty()) { qWarning() << "UDP:" << "Could not resolve host:" << host << "port:" << port; } else { // In simulation and testing setups the vehicle and the GCS can be // running on the same host. This leads to packets arriving through // the local network or the loopback adapter, which makes it look // like the vehicle is connected through two different links, // complicating routing. // // We detect this case and force all traffic to a simulated instance // onto the local loopback interface. bool not_local = true; // Run through all IPv4 interfaces and check if their canonical // IP address in string representation matches the source IP address foreach (const QHostAddress &address, QNetworkInterface::allAddresses()) { if (address.protocol() == QAbstractSocket::IPv4Protocol) { if (ipAdd.endsWith(address.toString())) { // This is a local address of the same host not_local = false; } } } if (not_local) { // This is a normal remote host, add it using its IPv4 address _hosts[ipAdd] = port; //qDebug() << "UDP:" << "Adding Host:" << ipAdd << ":" << port; } else { // It is localhost, so talk to it through the IPv4 loopback interface _hosts["127.0.0.1"] = port; } } } } void UDPConfiguration::removeHost(const QString& host) { QMutexLocker locker(&_confMutex); QString tHost = host; if (tHost.contains(":")) { tHost = tHost.split(":").first(); } tHost = tHost.trimmed(); QMap::iterator i = _hosts.find(tHost); if(i != _hosts.end()) { //qDebug() << "UDP:" << "Removed host:" << host; _hosts.erase(i); } else { qWarning() << "UDP:" << "Could not remove unknown host:" << host; } } bool UDPConfiguration::firstHost(QString& host, int& port) { _confMutex.lock(); _it = _hosts.begin(); if(_it == _hosts.end()) { _confMutex.unlock(); return false; } _confMutex.unlock(); return nextHost(host, port); } bool UDPConfiguration::nextHost(QString& host, int& port) { QMutexLocker locker(&_confMutex); if(_it != _hosts.end()) { host = _it.key(); port = _it.value(); _it++; return true; } return false; } void UDPConfiguration::setLocalPort(quint16 port) { _localPort = port; } void UDPConfiguration::saveSettings(QSettings& settings, const QString& root) { _confMutex.lock(); settings.beginGroup(root); settings.setValue("port", (int)_localPort); settings.setValue("hostCount", _hosts.count()); int index = 0; QMap::const_iterator it = _hosts.begin(); while(it != _hosts.end()) { QString hkey = QString("host%1").arg(index); settings.setValue(hkey, it.key()); QString pkey = QString("port%1").arg(index); settings.setValue(pkey, it.value()); it++; index++; } settings.endGroup(); _confMutex.unlock(); } void UDPConfiguration::loadSettings(QSettings& settings, const QString& root) { _confMutex.lock(); _hosts.clear(); _confMutex.unlock(); settings.beginGroup(root); _localPort = (quint16)settings.value("port", QGC_UDP_LOCAL_PORT).toUInt(); int hostCount = settings.value("hostCount", 0).toInt(); for(int i = 0; i < hostCount; i++) { QString hkey = QString("host%1").arg(i); QString pkey = QString("port%1").arg(i); if(settings.contains(hkey) && settings.contains(pkey)) { addHost(settings.value(hkey).toString(), settings.value(pkey).toInt()); } } settings.endGroup(); } void UDPConfiguration::updateSettings() { if(_link) { UDPLink* ulink = dynamic_cast(_link); if(ulink) { ulink->_restartConnection(); } } }