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// Copyright (C) 2021 The Qt Company Ltd.
// Copyright (C) 2019 Luxoft Sweden AB
// Copyright (C) 2018 Pelagicore AG
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
// 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);
#if defined(Q_OS_LINUX)
setChildProcessModifier([]() {
// at least on Linux we can make sure that those dbus-daemons are always killed
prctl(PR_SET_PDEATHSIG, SIGKILL);
});
#endif
}
DBusDaemonProcess::~DBusDaemonProcess()
{
kill();
waitForFinished();
}
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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