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