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strawberry-audio-player-win.../3rdparty/singleapplication/singleapplication_p.cpp

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// The MIT License (MIT)
//
// Copyright (c) Itay Grudev 2015 - 2018
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
// W A R N I N G !!!
// -----------------
//
// This file is not part of the SingleApplication API. It is used purely as an
// implementation detail. This header file may change from version to
// version without notice, or may even be removed.
//
#include <cstdlib>
#include <cstddef>
#include <QtCore/QDir>
#include <QtCore/QProcess>
#include <QtCore/QByteArray>
#include <QtCore/QSemaphore>
#include <QtCore/QDataStream>
#include <QtCore/QStandardPaths>
#include <QtCore/QCryptographicHash>
#include <QtNetwork/QLocalServer>
#include <QtNetwork/QLocalSocket>
#include "singleapplication.h"
#include "singleapplication_p.h"
#ifdef Q_OS_WIN
#include <windows.h>
#include <lmcons.h>
#endif
SingleApplicationPrivate::SingleApplicationPrivate( SingleApplication *q_ptr )
: q_ptr( q_ptr )
{
server = nullptr;
socket = nullptr;
memory = nullptr;
instanceNumber = -1;
}
SingleApplicationPrivate::~SingleApplicationPrivate()
{
if( socket != nullptr ) {
socket->close();
delete socket;
}
memory->lock();
InstancesInfo* inst = static_cast<InstancesInfo*>(memory->data());
if( server != nullptr ) {
server->close();
delete server;
inst->primary = false;
inst->primaryPid = -1;
inst->checksum = blockChecksum();
}
memory->unlock();
delete memory;
}
void SingleApplicationPrivate::genBlockServerName()
{
QCryptographicHash appData( QCryptographicHash::Sha256 );
appData.addData( "SingleApplication", 17 );
appData.addData( SingleApplication::app_t::applicationName().toUtf8() );
appData.addData( SingleApplication::app_t::organizationName().toUtf8() );
appData.addData( SingleApplication::app_t::organizationDomain().toUtf8() );
if( ! (options & SingleApplication::Mode::ExcludeAppVersion) ) {
appData.addData( SingleApplication::app_t::applicationVersion().toUtf8() );
}
if( ! (options & SingleApplication::Mode::ExcludeAppPath) ) {
#ifdef Q_OS_WIN
appData.addData( SingleApplication::app_t::applicationFilePath().toLower().toUtf8() );
#else
appData.addData( SingleApplication::app_t::applicationFilePath().toUtf8() );
#endif
}
// User level block requires a user specific data in the hash
if( options & SingleApplication::Mode::User ) {
#ifdef Q_OS_WIN
wchar_t username [ UNLEN + 1 ];
// Specifies size of the buffer on input
DWORD usernameLength = UNLEN + 1;
if( GetUserNameW( username, &usernameLength ) ) {
appData.addData( QString::fromWCharArray(username).toUtf8() );
} else {
appData.addData( QStandardPaths::standardLocations( QStandardPaths::HomeLocation ).join("").toUtf8() );
}
#endif
#ifdef Q_OS_UNIX
QProcess process;
process.start( "whoami" );
if( process.waitForFinished( 100 ) &&
process.exitCode() == QProcess::NormalExit) {
appData.addData( process.readLine() );
} else {
appData.addData(
QDir(
QStandardPaths::standardLocations( QStandardPaths::HomeLocation ).first()
).absolutePath().toUtf8()
);
}
#endif
}
// Replace the backslash in RFC 2045 Base64 [a-zA-Z0-9+/=] to comply with
// server naming requirements.
blockServerName = appData.result().toBase64().replace("/", "_");
}
void SingleApplicationPrivate::initializeMemoryBlock()
{
InstancesInfo* inst = static_cast<InstancesInfo*>( memory->data() );
inst->primary = false;
inst->secondary = 0;
inst->primaryPid = -1;
inst->checksum = blockChecksum();
}
void SingleApplicationPrivate::startPrimary()
{
Q_Q(SingleApplication);
// Successful creation means that no main process exists
// So we start a QLocalServer to listen for connections
QLocalServer::removeServer( blockServerName );
server = new QLocalServer();
// Restrict access to the socket according to the
// SingleApplication::Mode::User flag on User level or no restrictions
if( options & SingleApplication::Mode::User ) {
server->setSocketOptions( QLocalServer::UserAccessOption );
} else {
server->setSocketOptions( QLocalServer::WorldAccessOption );
}
server->listen( blockServerName );
QObject::connect(
server,
&QLocalServer::newConnection,
this,
&SingleApplicationPrivate::slotConnectionEstablished
);
// Reset the number of connections
InstancesInfo* inst = static_cast <InstancesInfo*>( memory->data() );
inst->primary = true;
inst->primaryPid = q->applicationPid();
inst->checksum = blockChecksum();
instanceNumber = 0;
}
void SingleApplicationPrivate::startSecondary()
{
}
void SingleApplicationPrivate::connectToPrimary( int msecs, ConnectionType connectionType )
{
// Connect to the Local Server of the Primary Instance if not already
// connected.
if( socket == nullptr ) {
socket = new QLocalSocket();
}
// If already connected - we are done;
if( socket->state() == QLocalSocket::ConnectedState )
return;
// If not connect
if( socket->state() == QLocalSocket::UnconnectedState ||
socket->state() == QLocalSocket::ClosingState ) {
socket->connectToServer( blockServerName );
}
// Wait for being connected
if( socket->state() == QLocalSocket::ConnectingState ) {
socket->waitForConnected( msecs );
}
// Initialisation message according to the SingleApplication protocol
if( socket->state() == QLocalSocket::ConnectedState ) {
// Notify the parent that a new instance had been started;
QByteArray initMsg;
QDataStream writeStream(&initMsg, QIODevice::WriteOnly);
#if (QT_VERSION >= QT_VERSION_CHECK(5, 6, 0))
writeStream.setVersion(QDataStream::Qt_5_6);
#endif
writeStream << blockServerName.toLatin1();
writeStream << static_cast<quint8>(connectionType);
writeStream << instanceNumber;
quint16 checksum = qChecksum(initMsg.constData(), static_cast<quint32>(initMsg.length()));
writeStream << checksum;
// The header indicates the message length that follows
QByteArray header;
QDataStream headerStream(&header, QIODevice::WriteOnly);
#if (QT_VERSION >= QT_VERSION_CHECK(5, 6, 0))
headerStream.setVersion(QDataStream::Qt_5_6);
#endif
headerStream << static_cast <quint64>( initMsg.length() );
socket->write( header );
socket->write( initMsg );
socket->flush();
socket->waitForBytesWritten( msecs );
}
}
quint16 SingleApplicationPrivate::blockChecksum()
{
return qChecksum(
static_cast <const char *>( memory->data() ),
offsetof( InstancesInfo, checksum )
);
}
qint64 SingleApplicationPrivate::primaryPid()
{
qint64 pid;
memory->lock();
InstancesInfo* inst = static_cast<InstancesInfo*>( memory->data() );
pid = inst->primaryPid;
memory->unlock();
return pid;
}
/**
* @brief Executed when a connection has been made to the LocalServer
*/
void SingleApplicationPrivate::slotConnectionEstablished()
{
QLocalSocket *nextConnSocket = server->nextPendingConnection();
connectionMap.insert(nextConnSocket, ConnectionInfo());
QObject::connect(nextConnSocket, &QLocalSocket::aboutToClose,
[nextConnSocket, this]() {
auto &info = connectionMap[nextConnSocket];
Q_EMIT this->slotClientConnectionClosed( nextConnSocket, info.instanceId );
}
);
QObject::connect(nextConnSocket, &QLocalSocket::disconnected,
[nextConnSocket, this](){
connectionMap.remove(nextConnSocket);
nextConnSocket->deleteLater();
}
);
QObject::connect(nextConnSocket, &QLocalSocket::readyRead,
[nextConnSocket, this]() {
auto &info = connectionMap[nextConnSocket];
switch(info.stage) {
case StageHeader:
readInitMessageHeader(nextConnSocket);
break;
case StageBody:
readInitMessageBody(nextConnSocket);
break;
case StageConnected:
Q_EMIT this->slotDataAvailable( nextConnSocket, info.instanceId );
break;
default:
break;
};
}
);
}
void SingleApplicationPrivate::readInitMessageHeader( QLocalSocket *sock )
{
if (!connectionMap.contains( sock )) {
return;
}
if( sock->bytesAvailable() < ( qint64 )sizeof( quint64 ) ) {
return;
}
QDataStream headerStream( sock );
#if (QT_VERSION >= QT_VERSION_CHECK(5, 6, 0))
headerStream.setVersion( QDataStream::Qt_5_6 );
#endif
// Read the header to know the message length
quint64 msgLen = 0;
headerStream >> msgLen;
ConnectionInfo &info = connectionMap[sock];
info.stage = StageBody;
info.msgLen = msgLen;
if ( sock->bytesAvailable() >= (qint64) msgLen ) {
readInitMessageBody( sock );
}
}
void SingleApplicationPrivate::readInitMessageBody( QLocalSocket *sock )
{
Q_Q(SingleApplication);
if (!connectionMap.contains( sock )) {
return;
}
ConnectionInfo &info = connectionMap[sock];
if( sock->bytesAvailable() < ( qint64 )info.msgLen ) {
return;
}
// Read the message body
QByteArray msgBytes = sock->read(info.msgLen);
QDataStream readStream(msgBytes);
#if (QT_VERSION >= QT_VERSION_CHECK(5, 6, 0))
readStream.setVersion( QDataStream::Qt_5_6 );
#endif
// server name
QByteArray latin1Name;
readStream >> latin1Name;
// connection type
ConnectionType connectionType = InvalidConnection;
quint8 connTypeVal = InvalidConnection;
readStream >> connTypeVal;
connectionType = static_cast <ConnectionType>( connTypeVal );
// instance id
quint32 instanceId = 0;
readStream >> instanceId;
// checksum
quint16 msgChecksum = 0;
readStream >> msgChecksum;
const quint16 actualChecksum = qChecksum( msgBytes.constData(), static_cast<quint32>( msgBytes.length() - sizeof( quint16 ) ) );
bool isValid = readStream.status() == QDataStream::Ok &&
QLatin1String(latin1Name) == blockServerName &&
msgChecksum == actualChecksum;
if( !isValid ) {
sock->close();
return;
}
info.instanceId = instanceId;
info.stage = StageConnected;
if( connectionType == NewInstance ||
( connectionType == SecondaryInstance &&
options & SingleApplication::Mode::SecondaryNotification ) )
{
Q_EMIT q->instanceStarted();
}
if (sock->bytesAvailable() > 0) {
Q_EMIT this->slotDataAvailable( sock, instanceId );
}
}
void SingleApplicationPrivate::slotDataAvailable( QLocalSocket *dataSocket, quint32 instanceId )
{
Q_Q(SingleApplication);
Q_EMIT q->receivedMessage( instanceId, dataSocket->readAll() );
}
void SingleApplicationPrivate::slotClientConnectionClosed( QLocalSocket *closedSocket, quint32 instanceId )
{
if( closedSocket->bytesAvailable() > 0 )
Q_EMIT slotDataAvailable( closedSocket, instanceId );
}
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