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/****************************************************************************
**
** Copyright (C) 2019 Luxoft Sweden AB
** Copyright (C) 2018 Pelagicore AG
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Application Manager.
**
** $QT_BEGIN_LICENSE:LGPL-QTAS$
** Commercial License Usage
** Licensees holding valid commercial Qt Automotive Suite licenses may use
** this file in accordance with the commercial license agreement provided
** with the Software or, alternatively, in accordance with the terms
** contained in a written agreement between you and The Qt Company. For
** licensing terms and conditions see https://www.qt.io/terms-conditions.
** For further information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
** SPDX-License-Identifier: LGPL-3.0
**
****************************************************************************/
// include as eary as possible, since the <windows.h> header will re-#define "interface"
#include <QDBusConnection>
#if defined(Q_OS_LINUX)
# include <sys/prctl.h>
# include <sys/signal.h>
# include <dlfcn.h>
# include <QVersionNumber>
#endif
#include <QCoreApplication>
#include <QIODevice>
#include "dbusdaemon.h"
#include "utilities.h"
#include "exception.h"
#include "logging.h"
QT_BEGIN_NAMESPACE_AM
#if defined(Q_OS_LINUX)
static QVersionNumber dbusVersion()
{
typedef void (*am_dbus_get_version_t)(int *, int *, int *);
static am_dbus_get_version_t am_dbus_get_version = nullptr;
if (!am_dbus_get_version)
am_dbus_get_version = reinterpret_cast<am_dbus_get_version_t>(dlsym(RTLD_DEFAULT, "dbus_get_version"));
if (!am_dbus_get_version)
qFatal("ERROR: could not resolve 'dbus_get_version' from libdbus-1");
int major = 0, minor = 0, patch = 0;
am_dbus_get_version(&major, &minor, &patch);
return QVersionNumber(major, minor, patch);
}
#endif
DBusDaemonProcess::DBusDaemonProcess(QObject *parent)
: QProcess(parent)
{
QString program = qSL("dbus-daemon");
QStringList arguments = { qSL("--nofork"), qSL("--print-address"), qSL("--session") };
#if defined(Q_OS_MACOS)
// there's no native dbus support on macOS, so we try to use brew's dbus support
program = qSL("/usr/local/bin/dbus-daemon");
// brew's dbus-daemon needs an address, because it will otherwise assume that it was
// started via launchd and expects its address in $DBUS_LAUNCHD_SESSION_BUS_SOCKET
QString address = qSL("--address=unix:path=") + QDir::tempPath() + qSL("/am-")
+ QString::number(QCoreApplication::applicationPid()) + qSL("-session.bus");
arguments << address;
#elif defined(Q_OS_WIN)
arguments << qSL("--address=tcp:host=localhost");
#elif defined(Q_OS_LINUX)
// some dbus implementations create an abstract socket by default, while others create
// a file based one. we need a file based one however, because that socket might get
// mapped into a container.
if (dbusVersion() >= QVersionNumber(1, 11, 14)) {
arguments << qSL("--address=unix:dir=/tmp");
} else {
arguments << QString(qSL("--address=unix:path=") + QDir::tempPath() + qSL("/am-")
+ QString::number(QCoreApplication::applicationPid()) + qSL("-session.bus"));
}
#endif
setProgram(program);
setArguments(arguments);
}
DBusDaemonProcess::~DBusDaemonProcess()
{
kill();
waitForFinished();
}
void DBusDaemonProcess::setupChildProcess()
{
# if defined(Q_OS_LINUX)
// at least on Linux we can make sure that those dbus-daemons are always killed
prctl(PR_SET_PDEATHSIG, SIGKILL);
# endif
QProcess::setupChildProcess();
}
void DBusDaemonProcess::start() Q_DECL_NOEXCEPT_EXPR(false)
{
static const int timeout = 10000 * int(timeoutFactor());
qunsetenv("DBUS_SESSION_BUS_ADDRESS");
auto dbusDaemon = new DBusDaemonProcess(qApp);
dbusDaemon->QProcess::start(QIODevice::ReadOnly);
if (!dbusDaemon->waitForStarted(timeout) || !dbusDaemon->waitForReadyRead(timeout)) {
throw Exception("could not start a dbus-daemon process (%1): %2")
.arg(dbusDaemon->program(), dbusDaemon->errorString());
}
QByteArray busAddress = dbusDaemon->readAllStandardOutput().trimmed();
qputenv("DBUS_SESSION_BUS_ADDRESS", busAddress);
qCInfo(LogSystem, "NOTICE: running on private D-Bus session bus to avoid conflicts:");
qCInfo(LogSystem, " DBUS_SESSION_BUS_ADDRESS=%s", busAddress.constData());
}
QT_END_NAMESPACE_AM
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