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/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
** of its contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#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.*";
QStringList environment = QProcess::systemEnvironment();
foreach (QString string, envVariables) {
int index = environment.indexOf(QRegExp(string));
if (index != -1) {
QStringList stringList = environment.at(index).split('=');
if (stringList.size() == 2) {
username = stringList.at(1).toUtf8();
break;
}
}
}
if (username.isEmpty())
#ifndef Q_OS_SYMBIAN
username = "unknown";
#else
username = "QtS60";
#endif
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.data(), datagram.size(),
&senderIp, &senderPort) == -1)
continue;
QList<QByteArray> list = datagram.split('@');
if (list.size() != 2)
continue;
int senderServerPort = list.at(1).toInt();
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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