peermanager.cpp Example File

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#include <QtNetwork> #include "client.h" #include "connection.h" #include "peermanager.h" static const qint32 BroadcastInterval = 2000; static const unsigned broadcastPort = 45000; PeerManager::PeerManager(Client *client) : QObject(client) { this->client = client; QStringList envVariables; envVariables << "USERNAME" << "USER" << "USERDOMAIN" << "HOSTNAME" << "DOMAINNAME"; QProcessEnvironment environment = QProcessEnvironment::systemEnvironment(); foreach (QString string, envVariables) { if (environment.contains(string)) { username = environment.value(string).toUtf8(); break; } } if (username.isEmpty()) username = "unknown"; updateAddresses(); serverPort = 0; broadcastSocket.bind(QHostAddress::Any, broadcastPort, QUdpSocket::ShareAddress | QUdpSocket::ReuseAddressHint); connect(&broadcastSocket, SIGNAL(readyRead()), this, SLOT(readBroadcastDatagram())); broadcastTimer.setInterval(BroadcastInterval); connect(&broadcastTimer, SIGNAL(timeout()), this, SLOT(sendBroadcastDatagram())); } void PeerManager::setServerPort(int port) { serverPort = port; } QByteArray PeerManager::userName() const { return username; } void PeerManager::startBroadcasting() { broadcastTimer.start(); } bool PeerManager::isLocalHostAddress(const QHostAddress &address) { foreach (QHostAddress localAddress, ipAddresses) { if (address == localAddress) return true; } return false; } void PeerManager::sendBroadcastDatagram() { QByteArray datagram(username); datagram.append('@'); datagram.append(QByteArray::number(serverPort)); bool validBroadcastAddresses = true; foreach (QHostAddress address, broadcastAddresses) { if (broadcastSocket.writeDatagram(datagram, address, broadcastPort) == -1) validBroadcastAddresses = false; } if (!validBroadcastAddresses) updateAddresses(); } void PeerManager::readBroadcastDatagram() { while (broadcastSocket.hasPendingDatagrams()) { QHostAddress senderIp; quint16 senderPort; QByteArray datagram; datagram.resize(broadcastSocket.pendingDatagramSize()); if (broadcastSocket.readDatagram(, datagram.size(), &senderIp, &senderPort) == -1) continue; QList<QByteArray> list = datagram.split('@'); if (list.size() != 2) continue; int senderServerPort =; if (isLocalHostAddress(senderIp) && senderServerPort == serverPort) continue; if (!client->hasConnection(senderIp)) { Connection *connection = new Connection(this); emit newConnection(connection); connection->connectToHost(senderIp, senderServerPort); } } } void PeerManager::updateAddresses() { broadcastAddresses.clear(); ipAddresses.clear(); foreach (QNetworkInterface interface, QNetworkInterface::allInterfaces()) { foreach (QNetworkAddressEntry entry, interface.addressEntries()) { QHostAddress broadcastAddress = entry.broadcast(); if (broadcastAddress != QHostAddress::Null && entry.ip() != QHostAddress::LocalHost) { broadcastAddresses << broadcastAddress; ipAddresses << entry.ip(); } } } }

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