506 lines
14 KiB
C++
506 lines
14 KiB
C++
// The MIT License (MIT)
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//
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// Copyright (c) Itay Grudev 2015 - 2020
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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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#ifdef Q_OS_WIN
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# ifndef NOMINMAX
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# define NOMINMAX 1
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# endif
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# include <windows.h>
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# include <lmcons.h>
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#endif
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#include <QObject>
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#include <QThread>
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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 <QElapsedTimer>
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#include <QRandomGenerator>
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#include "singleapplication_t.h"
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#include "singleapplication_p.h"
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SingleApplicationPrivateClass::SingleApplicationPrivateClass(SingleApplicationClass *ptr)
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: q_ptr(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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SingleApplicationPrivateClass::~SingleApplicationPrivateClass() {
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if (socket_ != nullptr && socket_->isOpen()) {
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socket_->close();
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}
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if (memory_ != nullptr) {
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memory_->lock();
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if (server_ != nullptr) {
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server_->close();
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InstancesInfo *instance = static_cast<InstancesInfo*>(memory_->data());
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instance->primary = false;
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instance->primaryPid = -1;
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instance->primaryUser[0] = '\0';
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instance->checksum = blockChecksum();
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}
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memory_->unlock();
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if (memory_->isAttached()) {
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memory_->detach();
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}
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}
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}
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QString SingleApplicationPrivateClass::getUsername() {
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#ifdef Q_OS_UNIX
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QString 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 = QString::fromLocal8Bit(pw->pw_name);
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}
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#endif
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if (username.isEmpty()) {
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username = qEnvironmentVariable("USER");
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}
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return 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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return QString::fromWCharArray(username);
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}
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return qEnvironmentVariable("USERNAME");
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#endif
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}
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void SingleApplicationPrivateClass::genBlockServerName() {
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QCryptographicHash appData(QCryptographicHash::Sha256);
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appData.addData("SingleApplication");
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appData.addData(SingleApplicationClass::applicationName().toUtf8());
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appData.addData(SingleApplicationClass::organizationName().toUtf8());
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appData.addData(SingleApplicationClass::organizationDomain().toUtf8());
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if (!(options_ & SingleApplicationClass::Mode::ExcludeAppVersion)) {
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appData.addData(SingleApplicationClass::applicationVersion().toUtf8());
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}
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if (!(options_ & SingleApplicationClass::Mode::ExcludeAppPath)) {
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#if defined(Q_OS_UNIX)
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const QByteArray appImagePath = qgetenv("APPIMAGE");
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if (appImagePath.isEmpty()) {
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appData.addData(SingleApplicationClass::applicationFilePath().toUtf8());
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}
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else {
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appData.addData(appImagePath);
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}
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#elif defined(Q_OS_WIN)
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appData.addData(SingleApplicationClass::applicationFilePath().toLower().toUtf8());
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#else
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appData.addData(SingleApplicationClass::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_ & SingleApplicationClass::Mode::User) {
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appData.addData(getUsername().toUtf8());
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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 SingleApplicationPrivateClass::initializeMemoryBlock() const {
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InstancesInfo *instance = static_cast<InstancesInfo*>(memory_->data());
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instance->primary = false;
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instance->secondary = 0;
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instance->primaryPid = -1;
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instance->primaryUser[0] = '\0';
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instance->checksum = blockChecksum();
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}
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void SingleApplicationPrivateClass::startPrimary() {
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// Reset the number of connections
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InstancesInfo *instance = static_cast<InstancesInfo*>(memory_->data());
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instance->primary = true;
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instance->primaryPid = QCoreApplication::applicationPid();
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qstrncpy(instance->primaryUser, getUsername().toUtf8().data(), sizeof(instance->primaryUser));
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instance->checksum = blockChecksum();
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instanceNumber_ = 0;
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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(this);
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// Restrict access to the socket according to the SingleApplication::Mode::User flag on User level or no restrictions
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if (options_ & SingleApplicationClass::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, &SingleApplicationPrivateClass::slotConnectionEstablished);
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}
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void SingleApplicationPrivateClass::startSecondary() {
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InstancesInfo *instance = static_cast<InstancesInfo*>(memory_->data());
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instance->secondary += 1;
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instance->checksum = blockChecksum();
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instanceNumber_ = instance->secondary;
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}
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bool SingleApplicationPrivateClass::connectToPrimary(const int timeout, 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(this);
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}
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if (socket_->state() == QLocalSocket::ConnectedState) return true;
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QElapsedTimer time;
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time.start();
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if (socket_->state() != QLocalSocket::ConnectedState) {
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forever {
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randomSleep();
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if (socket_->state() != QLocalSocket::ConnectingState) {
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socket_->connectToServer(blockServerName_);
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}
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if (socket_->state() == QLocalSocket::ConnectingState) {
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socket_->waitForConnected(static_cast<int>(timeout - time.elapsed()));
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}
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// If connected break out of the loop
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if (socket_->state() == QLocalSocket::ConnectedState) break;
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// If elapsed time since start is longer than the method timeout return
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if (time.elapsed() >= timeout) return false;
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}
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}
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// Initialization message according to the SingleApplication protocol
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QByteArray initMsg;
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QDataStream writeStream(&initMsg, QIODevice::WriteOnly);
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writeStream.setVersion(QDataStream::Qt_5_8);
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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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#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
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quint16 checksum = qChecksum(QByteArray(initMsg, static_cast<quint32>(initMsg.length())));
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#else
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quint16 checksum = qChecksum(initMsg.constData(), static_cast<quint32>(initMsg.length()));
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#endif
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writeStream << checksum;
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return writeConfirmedMessage(static_cast<int>(timeout - time.elapsed()), initMsg);
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}
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void SingleApplicationPrivateClass::writeAck(QLocalSocket *sock) {
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sock->putChar('\n');
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}
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bool SingleApplicationPrivateClass::writeConfirmedMessage(const int timeout, const QByteArray &msg) const {
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QElapsedTimer time;
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time.start();
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// Frame 1: 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_8);
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headerStream << static_cast<quint64>(msg.length());
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if (!writeConfirmedFrame(static_cast<int>(timeout - time.elapsed()), header)) {
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return false;
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}
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// Frame 2: The message
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return writeConfirmedFrame(static_cast<int>(timeout - time.elapsed()), msg);
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}
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bool SingleApplicationPrivateClass::writeConfirmedFrame(const int timeout, const QByteArray &msg) const {
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socket_->write(msg);
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socket_->flush();
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bool result = socket_->waitForReadyRead(timeout);
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if (result) {
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socket_->read(1);
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return true;
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}
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return false;
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}
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quint16 SingleApplicationPrivateClass::blockChecksum() const {
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#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
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quint16 checksum = qChecksum(QByteArray(static_cast<const char*>(memory_->constData()), offsetof(InstancesInfo, checksum)));
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#else
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quint16 checksum = qChecksum(static_cast<const char*>(memory_->constData()), offsetof(InstancesInfo, checksum));
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#endif
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return checksum;
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}
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qint64 SingleApplicationPrivateClass::primaryPid() const {
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memory_->lock();
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InstancesInfo *instance = static_cast<InstancesInfo*>(memory_->data());
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qint64 pid = instance->primaryPid;
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memory_->unlock();
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return pid;
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}
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QString SingleApplicationPrivateClass::primaryUser() const {
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memory_->lock();
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InstancesInfo *instance = static_cast<InstancesInfo*>(memory_->data());
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QByteArray username = instance->primaryUser;
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memory_->unlock();
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return QString::fromUtf8(username);
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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 SingleApplicationPrivateClass::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, this, [this, nextConnSocket]() {
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const ConnectionInfo &info = connectionMap_[nextConnSocket];
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slotClientConnectionClosed(nextConnSocket, info.instanceId);
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});
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QObject::connect(nextConnSocket, &QLocalSocket::disconnected, nextConnSocket, &QLocalSocket::deleteLater);
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QObject::connect(nextConnSocket, &QLocalSocket::destroyed, this, [this, nextConnSocket]() {
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connectionMap_.remove(nextConnSocket);
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});
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QObject::connect(nextConnSocket, &QLocalSocket::readyRead, this, [this, nextConnSocket]() {
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const ConnectionInfo &info = connectionMap_[nextConnSocket];
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switch (info.stage) {
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case StageInitHeader:
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readMessageHeader(nextConnSocket, StageInitBody);
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break;
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case StageInitBody:
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readInitMessageBody(nextConnSocket);
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break;
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case StageConnectedHeader:
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readMessageHeader(nextConnSocket, StageConnectedBody);
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break;
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case StageConnectedBody:
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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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void SingleApplicationPrivateClass::readMessageHeader(QLocalSocket *sock, const SingleApplicationPrivateClass::ConnectionStage nextStage) {
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if (!connectionMap_.contains(sock)) {
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return;
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}
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if (sock->bytesAvailable() < static_cast<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_8);
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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 = nextStage;
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info.msgLen = msgLen;
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writeAck(sock);
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}
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bool SingleApplicationPrivateClass::isFrameComplete(QLocalSocket *sock) {
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if (!connectionMap_.contains(sock)) {
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return false;
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}
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const ConnectionInfo &info = connectionMap_[sock];
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return (sock->bytesAvailable() >= static_cast<qint64>(info.msgLen));
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}
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void SingleApplicationPrivateClass::readInitMessageBody(QLocalSocket *sock) {
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Q_Q(SingleApplicationClass);
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if (!isFrameComplete(sock)) {
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return;
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}
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// Read the message body
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QByteArray msgBytes = sock->readAll();
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QDataStream readStream(msgBytes);
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readStream.setVersion(QDataStream::Qt_5_8);
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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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quint8 connTypeVal = InvalidConnection;
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readStream >> connTypeVal;
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const ConnectionType 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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#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
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const quint16 actualChecksum = qChecksum(QByteArray(msgBytes, static_cast<quint32>(msgBytes.length() - sizeof(quint16))));
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#else
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const quint16 actualChecksum = qChecksum(msgBytes.constData(), static_cast<quint32>(msgBytes.length() - sizeof(quint16)));
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#endif
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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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ConnectionInfo &info = connectionMap_[sock];
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info.instanceId = instanceId;
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info.stage = StageConnectedHeader;
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if (connectionType == NewInstance || (connectionType == SecondaryInstance && options_ & SingleApplicationClass::Mode::SecondaryNotification)) {
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emit q->instanceStarted();
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}
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writeAck(sock);
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}
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void SingleApplicationPrivateClass::slotDataAvailable(QLocalSocket *dataSocket, const quint32 instanceId) {
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Q_Q(SingleApplicationClass);
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if (!isFrameComplete(dataSocket)) {
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return;
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}
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const QByteArray message = dataSocket->readAll();
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writeAck(dataSocket);
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ConnectionInfo &info = connectionMap_[dataSocket];
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info.stage = StageConnectedHeader;
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emit q->receivedMessage(instanceId, message);
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}
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void SingleApplicationPrivateClass::slotClientConnectionClosed(QLocalSocket *closedSocket, const quint32 instanceId) {
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if (closedSocket->bytesAvailable() > 0) {
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slotDataAvailable(closedSocket, instanceId);
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}
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}
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void SingleApplicationPrivateClass::randomSleep() {
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QThread::msleep(QRandomGenerator::global()->bounded(8U, 18U));
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}
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