Revision control
Copy as Markdown
// Copyright (C) 2016 The Qt Company Ltd.
// Copyright (C) 2016 Intel Corporation.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
// Qt-Security score:significant reason:load-external-library-via-qlibrary
#include "qdbus_symbols_p.h"
#include <QtCore/qlatin1stringview.h>
#if QT_CONFIG(library)
#include <QtCore/qlibrary.h>
#include <QtCore/private/qlocking_p.h>
#endif
#include <QtCore/qmutex.h>
#ifndef QT_NO_DBUS
QT_BEGIN_NAMESPACE
using namespace Qt::StringLiterals;
#if !defined QT_LINKED_LIBDBUS
#if QT_CONFIG(library)
Q_CONSTINIT static QLibrary *qdbus_libdbus = nullptr;
void qdbus_unloadLibDBus()
{
if (qdbus_libdbus) {
if (qEnvironmentVariableIsSet("QDBUS_FORCE_SHUTDOWN"))
qdbus_libdbus->resolve("dbus_shutdown")();
qdbus_libdbus->unload();
}
delete qdbus_libdbus;
qdbus_libdbus = nullptr;
}
#endif
bool qdbus_loadLibDBus()
{
#if QT_CONFIG(library)
#ifdef QT_BUILD_INTERNAL
// this is to simulate a library load failure for our autotest suite.
if (!qEnvironmentVariableIsEmpty("QT_SIMULATE_DBUS_LIBFAIL"))
return false;
#endif
Q_CONSTINIT static bool triedToLoadLibrary = false;
Q_CONSTINIT static QBasicMutex mutex;
const auto locker = qt_scoped_lock(mutex);
QLibrary *&lib = qdbus_libdbus;
if (triedToLoadLibrary)
return lib && lib->isLoaded();
lib = new QLibrary;
lib->setLoadHints(QLibrary::ExportExternalSymbolsHint); // make libdbus symbols available for apps that need more advanced control over the dbus
triedToLoadLibrary = true;
static constexpr int majorversions[] = { 3, 2, -1 };
const QString baseNames[] = {
#ifdef Q_OS_WIN
"dbus-1"_L1,
#endif
"libdbus-1"_L1
};
lib->unload();
for (const int majorversion : majorversions) {
for (const QString &baseName : baseNames) {
#ifdef Q_OS_WIN
QString suffix;
if (majorversion != -1)
suffix = QString::number(- majorversion); // negative so it prepends the dash
lib->setFileName(baseName + suffix);
#else
lib->setFileNameAndVersion(baseName, majorversion);
#endif
if (lib->load() && lib->resolve("dbus_connection_open_private"))
return true;
lib->unload();
}
}
delete lib;
lib = nullptr;
return false;
#else
return true;
#endif
}
QFunctionPointer qdbus_resolve_conditionally(const char *name)
{
#if QT_CONFIG(library)
if (qdbus_loadLibDBus())
return qdbus_libdbus->resolve(name);
#else
Q_UNUSED(name);
#endif
return nullptr;
}
QFunctionPointer qdbus_resolve_me(const char *name)
{
#if QT_CONFIG(library)
if (Q_UNLIKELY(!qdbus_loadLibDBus()))
qFatal("Cannot find libdbus-1 in your system to resolve symbol '%s'.", name);
QFunctionPointer ptr = qdbus_libdbus->resolve(name);
if (Q_UNLIKELY(!ptr))
qFatal("Cannot resolve '%s' in your libdbus-1.", name);
return ptr;
#else
Q_UNUSED(name);
return nullptr;
#endif
}
#else
static void qdbus_unloadLibDBus()
{
if (qEnvironmentVariableIsSet("QDBUS_FORCE_SHUTDOWN"))
dbus_shutdown();
}
#endif // !QT_LINKED_LIBDBUS
#if defined(QT_LINKED_LIBDBUS) || QT_CONFIG(library)
Q_DESTRUCTOR_FUNCTION(qdbus_unloadLibDBus)
#endif
QT_END_NAMESPACE
#endif // QT_NO_DBUS