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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 Qt Solutions component.
**
** $QT_BEGIN_LICENSE:BSD$
** 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 "LocalPeer.h"
#include <QCoreApplication>
#include <QDataStream>
#include <QTime>
#include <QLocalServer>
#include <QLocalSocket>
#include <QDir>
#include "LockedFile.h"
#if defined(Q_OS_WIN)
#include <QLibrary>
#include <qt_windows.h>
typedef BOOL(WINAPI*PProcessIdToSessionId)(DWORD,DWORD*);
static PProcessIdToSessionId pProcessIdToSessionId = 0;
#endif
#if defined(Q_OS_UNIX)
#include <sys/types.h>
#include <unistd.h>
#endif
#include <chrono>
#include <thread>
#include <QCryptographicHash>
static const char* ack = "ack";
ApplicationId ApplicationId::fromTraditionalApp()
{
QString protoId = QCoreApplication::applicationFilePath();
#if defined(Q_OS_WIN)
protoId = protoId.toLower();
#endif
auto prefix = protoId.section(QLatin1Char('/'), -1);
prefix.remove(QRegExp("[^a-zA-Z]"));
prefix.truncate(6);
QByteArray idc = protoId.toUtf8();
quint16 idNum = qChecksum(idc.constData(), idc.size());
auto socketName = QLatin1String("qtsingleapp-") + prefix + QLatin1Char('-') + QString::number(idNum, 16);
#if defined(Q_OS_WIN)
if (!pProcessIdToSessionId)
{
QLibrary lib("kernel32");
pProcessIdToSessionId = (PProcessIdToSessionId)lib.resolve("ProcessIdToSessionId");
}
if (pProcessIdToSessionId)
{
DWORD sessionId = 0;
pProcessIdToSessionId(GetCurrentProcessId(), &sessionId);
socketName += QLatin1Char('-') + QString::number(sessionId, 16);
}
#else
socketName += QLatin1Char('-') + QString::number(::getuid(), 16);
#endif
return ApplicationId(socketName);
}
ApplicationId ApplicationId::fromPathAndVersion(const QString& dataPath, const QString& version)
{
QCryptographicHash shasum(QCryptographicHash::Algorithm::Sha1);
QString result = dataPath + QLatin1Char('-') + version;
shasum.addData(result.toUtf8());
return ApplicationId(QLatin1String("qtsingleapp-") + QString::fromLatin1(shasum.result().toHex()));
}
ApplicationId ApplicationId::fromCustomId(const QString& id)
{
return ApplicationId(QLatin1String("qtsingleapp-") + id);
}
LocalPeer::LocalPeer(QObject * parent, const ApplicationId &appId)
: QObject(parent), id(appId)
{
socketName = id.toString();
server.reset(new QLocalServer());
QString lockName = QDir(QDir::tempPath()).absolutePath() + QLatin1Char('/') + socketName + QLatin1String("-lockfile");
lockFile.reset(new LockedFile(lockName));
lockFile->open(QIODevice::ReadWrite);
}
LocalPeer::~LocalPeer()
{
}
ApplicationId LocalPeer::applicationId() const
{
return id;
}
bool LocalPeer::isClient()
{
if (lockFile->isLocked())
return false;
if (!lockFile->lock(LockedFile::WriteLock, false))
return true;
bool res = server->listen(socketName);
#if defined(Q_OS_UNIX)
// ### Workaround
if (!res && server->serverError() == QAbstractSocket::AddressInUseError) {
QFile::remove(QDir::cleanPath(QDir::tempPath())+QLatin1Char('/')+socketName);
res = server->listen(socketName);
}
#endif
if (!res)
qWarning("QtSingleCoreApplication: listen on local socket failed, %s", qPrintable(server->errorString()));
QObject::connect(server.get(), SIGNAL(newConnection()), SLOT(receiveConnection()));
return false;
}
bool LocalPeer::sendMessage(const QString &message, int timeout)
{
if (!isClient())
return false;
QLocalSocket socket;
bool connOk = false;
for(int i = 0; i < 2; i++) {
// Try twice, in case the other instance is just starting up
socket.connectToServer(socketName);
connOk = socket.waitForConnected(timeout/2);
if (connOk || i)
{
break;
}
std::this_thread::sleep_for(std::chrono::milliseconds(250));
}
if (!connOk)
{
return false;
}
QByteArray uMsg(message.toUtf8());
QDataStream ds(&socket);
ds.writeBytes(uMsg.constData(), uMsg.size());
if(!socket.waitForBytesWritten(timeout))
{
return false;
}
// wait for 'ack'
if(!socket.waitForReadyRead(timeout))
{
return false;
}
// make sure we got 'ack'
if(!(socket.read(qstrlen(ack)) == ack))
{
return false;
}
return true;
}
void LocalPeer::receiveConnection()
{
QLocalSocket* socket = server->nextPendingConnection();
if (!socket)
{
return;
}
while (socket->bytesAvailable() < (int)sizeof(quint32))
{
socket->waitForReadyRead();
}
QDataStream ds(socket);
QByteArray uMsg;
quint32 remaining;
ds >> remaining;
uMsg.resize(remaining);
int got = 0;
char* uMsgBuf = uMsg.data();
do
{
got = ds.readRawData(uMsgBuf, remaining);
remaining -= got;
uMsgBuf += got;
} while (remaining && got >= 0 && socket->waitForReadyRead(2000));
if (got < 0)
{
qWarning("QtLocalPeer: Message reception failed %s", socket->errorString().toLatin1().constData());
delete socket;
return;
}
QString message(QString::fromUtf8(uMsg));
socket->write(ack, qstrlen(ack));
socket->waitForBytesWritten(1000);
socket->waitForDisconnected(1000); // make sure client reads ack
delete socket;
emit messageReceived(message); //### (might take a long time to return)
}
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