// Copyright (C) 2016 The Qt Company Ltd.

// 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:default

#include "qdbusconnectioninterface.h"

#include <QtCore/QByteArray>

#include <QtCore/QList>

#include <QtCore/QMap>

#include <QtCore/QMetaMethod>

#include <QtCore/QString>

#include <QtCore/QStringList>

#include <QtCore/QVariant>

#include <QtCore/QDebug>

#include "qdbusutil_p.h"          // for the DBUS_* constants

#ifndef QT_NO_DBUS

QT_BEGIN_NAMESPACE

using namespace Qt::StringLiterals;

/*

 * Implementation of interface class QDBusConnectionInterface

 */

/*!

    \class QDBusConnectionInterface

    \inmodule QtDBus

    \since 4.2

    \brief The QDBusConnectionInterface class provides access to the D-Bus bus daemon service.

    The D-Bus bus server daemon provides one special interface \c

    org.freedesktop.DBus that allows clients to access certain

    properties of the bus, such as the current list of clients

    connected. The QDBusConnectionInterface class provides access to that

    interface.

    The most common uses of this class are to register and unregister

    service names on the bus using the registerService() and

    unregisterService() functions, query about existing names using

    the isServiceRegistered(), registeredServiceNames() and

    serviceOwner() functions, and to receive notification that a

    client has registered or de-registered through the

    serviceRegistered(), serviceUnregistered() and serviceOwnerChanged()

    signals.

*/

/*!

    \enum QDBusConnectionInterface::ServiceQueueOptions

    Flags for determining how a service registration should behave, in

    case the service name is already registered.

    \value DontQueueService     If an application requests a name that

                                is already owned, no queueing will be

                                performed. The registeredService()

                                call will simply fail.

                                This is the default.

    \value QueueService         Attempts to register the requested

                                service, but do not try to replace it

                                if another application already has it

                                registered. Instead, simply put this

                                application in queue, until it is

                                given up. The serviceRegistered()

                                signal will be emitted when that

                                happens.

    \value ReplaceExistingService If another application already has

                                the service name registered, attempt

                                to replace it.

    \sa ServiceReplacementOptions

*/

/*!

    \enum QDBusConnectionInterface::ServiceReplacementOptions

    Flags for determining if the D-Bus server should allow another

    application to replace a name that this application has registered

    with the ReplaceExistingService option.

    The possible values are:

    \value DontAllowReplacement Do not allow another application to

                                replace us. The service must be

                                explicitly unregistered with

                                unregisterService() for another

                                application to acquire it.

                                This is the default.

    \value AllowReplacement     Allow other applications to replace us

                                with the ReplaceExistingService option

                                to registerService() without

                                intervention. If that happens, the

                                serviceUnregistered() signal will be

                                emitted.

    \sa ServiceQueueOptions

*/

/*!

    \enum QDBusConnectionInterface::RegisterServiceReply

    The possible return values from registerService():

    \value ServiceNotRegistered The call failed and the service name was not registered.

    \value ServiceRegistered    The caller is now the owner of the service name.

    \value ServiceQueued        The caller specified the QueueService flag and the

                                service was already registered, so we are in queue.

    The serviceRegistered() signal will be emitted when the service is

    acquired by this application.

*/

/*!

    \internal

*/

const char *QDBusConnectionInterface::staticInterfaceName()

{ return "org.freedesktop.DBus"; }

/*!

    \internal

*/

QDBusConnectionInterface::QDBusConnectionInterface(const QDBusConnection &connection,

                                                   QObject *parent)

    : QDBusAbstractInterface(QDBusUtil::dbusService(),

                             QDBusUtil::dbusPath(),

                             DBUS_INTERFACE_DBUS, connection, parent)

{

    connect(this, &QDBusConnectionInterface::NameAcquired, this, emit &QDBusConnectionInterface::serviceRegistered);

    connect(this, &QDBusConnectionInterface::NameLost, this, emit &QDBusConnectionInterface::serviceUnregistered);

    connect(this, &QDBusConnectionInterface::NameOwnerChanged,

            this, emit &QDBusConnectionInterface::serviceOwnerChanged);

}

/*!

    \internal

*/

QDBusConnectionInterface::~QDBusConnectionInterface()

{

}

/*!

    Returns the unique connection name of the primary owner of the

    name \a name. If the requested name doesn't have an owner, returns

    a \c org.freedesktop.DBus.Error.NameHasNoOwner error.

*/

QDBusReply<QString> QDBusConnectionInterface::serviceOwner(const QString &name) const

{

    return internalConstCall(QDBus::AutoDetect, "GetNameOwner"_L1, QList<QVariant>() << name);

}

/*!

  \property QDBusConnectionInterface::registeredServiceNames

  \brief holds the registered service names

  Lists all names currently registered on the bus.

*/

QDBusReply<QStringList> QDBusConnectionInterface::registeredServiceNames() const

{

    return internalConstCall(QDBus::AutoDetect, "ListNames"_L1);

}

/*!

  \property QDBusConnectionInterface::activatableServiceNames

  \brief holds the activatable service names

  \since 5.14

  Lists all names that can be activated on the bus.

*/

QDBusReply<QStringList> QDBusConnectionInterface::activatableServiceNames() const

{

    return internalConstCall(QDBus::AutoDetect, "ListActivatableNames"_L1);

}

/*!

    Returns \c true if the service name \a serviceName has is currently

    registered.

*/

QDBusReply<bool> QDBusConnectionInterface::isServiceRegistered(const QString &serviceName) const

{

    return internalConstCall(QDBus::AutoDetect, "NameHasOwner"_L1,

                             QList<QVariant>() << serviceName);

}

/*!

    Returns the Unix Process ID (PID) for the process currently

    holding the bus service \a serviceName.

*/

QDBusReply<uint> QDBusConnectionInterface::servicePid(const QString &serviceName) const

{

    return internalConstCall(QDBus::AutoDetect, "GetConnectionUnixProcessID"_L1,

                             QList<QVariant>() << serviceName);

}

/*!

    Returns the Unix User ID (UID) for the process currently holding

    the bus service \a serviceName.

*/

QDBusReply<uint> QDBusConnectionInterface::serviceUid(const QString &serviceName) const

{

    return internalConstCall(QDBus::AutoDetect, "GetConnectionUnixUser"_L1,

                             QList<QVariant>() << serviceName);

}

/*!

    \since 6.10

    Returns the connection credentials for the process currently holding

    the bus service \a serviceName.

    See <https://dbus.freedesktop.org/doc/dbus-specification.html>

    section: 'Method: org.freedesktop.DBus.GetConnectionCredentials' for more information.

*/

QDBusReply<QVariantMap> QDBusConnectionInterface::serviceCredentials(const QString &serviceName) const

{

    return internalConstCall(QDBus::AutoDetect, "GetConnectionCredentials"_L1,

                             QList<QVariant>() << serviceName);

}

/*!

    Requests that the bus start the service given by the name \a name.

*/

QDBusReply<void> QDBusConnectionInterface::startService(const QString &name)

{

    return call("StartServiceByName"_L1, name, uint(0));

}

/*!

    Requests to register the service name \a serviceName on the

    bus. The \a qoption flag specifies how the D-Bus server should behave

    if \a serviceName is already registered. The \a roption flag

    specifies if the server should allow another application to

    replace our registered name.

    If the service registration succeeds, the serviceRegistered()

    signal will be emitted. If we are placed in queue, the signal will

    be emitted when we obtain the name. If \a roption is

    AllowReplacement, the serviceUnregistered() signal will be emitted

    if another application replaces this one.

    \sa unregisterService()

*/

QDBusReply<QDBusConnectionInterface::RegisterServiceReply>

QDBusConnectionInterface::registerService(const QString &serviceName,

                                          ServiceQueueOptions qoption,

                                          ServiceReplacementOptions roption)

{

    // reconstruct the low-level flags

    uint flags = 0;

    switch (qoption) {

    case DontQueueService:

        flags = DBUS_NAME_FLAG_DO_NOT_QUEUE;

        break;

    case QueueService:

        flags = 0;

        break;

    case ReplaceExistingService:

        flags = DBUS_NAME_FLAG_DO_NOT_QUEUE | DBUS_NAME_FLAG_REPLACE_EXISTING;

        break;

    }

    switch (roption) {

    case DontAllowReplacement:

        break;

    case AllowReplacement:

        flags |= DBUS_NAME_FLAG_ALLOW_REPLACEMENT;

        break;

    }

    QDBusMessage reply = call("RequestName"_L1, serviceName, flags);

//    qDebug() << "QDBusConnectionInterface::registerService" << serviceName << "Reply:" << reply;

    // convert the low-level flags to something that we can use

    if (reply.type() == QDBusMessage::ReplyMessage) {

        uint code = 0;

        switch (reply.arguments().at(0).toUInt()) {

        case DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER:

        case DBUS_REQUEST_NAME_REPLY_ALREADY_OWNER:

            code = uint(ServiceRegistered);

            break;

        case DBUS_REQUEST_NAME_REPLY_EXISTS:

            code = uint(ServiceNotRegistered);

            break;

        case DBUS_REQUEST_NAME_REPLY_IN_QUEUE:

            code = uint(ServiceQueued);

            break;

        }

        reply.setArguments(QVariantList() << code);

    }

    return reply;

}

/*!

    Releases the claim on the bus service name \a serviceName, that

    had been previously registered with registerService(). If this

    application had ownership of the name, it will be released for

    other applications to claim. If it only had the name queued, it

    gives up its position in the queue.

*/

QDBusReply<bool>

QDBusConnectionInterface::unregisterService(const QString &serviceName)

{

    QDBusMessage reply = call("ReleaseName"_L1, serviceName);

    if (reply.type() == QDBusMessage::ReplyMessage) {

        bool success = reply.arguments().at(0).toUInt() == DBUS_RELEASE_NAME_REPLY_RELEASED;

        reply.setArguments(QVariantList() << success);

    }

    return reply;

}

/*!

    \internal

*/

void QDBusConnectionInterface::connectNotify(const QMetaMethod &signal)

{

    // translate the signal names to what we really want

    // this avoids setting hooks for signals that don't exist on the bus

    static const QMetaMethod serviceRegisteredSignal = QMetaMethod::fromSignal(&QDBusConnectionInterface::serviceRegistered);

    static const QMetaMethod serviceUnregisteredSignal = QMetaMethod::fromSignal(&QDBusConnectionInterface::serviceUnregistered);

    static const QMetaMethod serviceOwnerChangedSignal = QMetaMethod::fromSignal(&QDBusConnectionInterface::serviceOwnerChanged);

    static const QMetaMethod NameAcquiredSignal = QMetaMethod::fromSignal(&QDBusConnectionInterface::NameAcquired);

    static const QMetaMethod NameLostSignal = QMetaMethod::fromSignal(&QDBusConnectionInterface::NameLost);

    static const QMetaMethod NameOwnerChangedSignal = QMetaMethod::fromSignal(&QDBusConnectionInterface::NameOwnerChanged);

    if (signal == serviceRegisteredSignal)

        QDBusAbstractInterface::connectNotify(NameAcquiredSignal);

    else if (signal == serviceUnregisteredSignal)

        QDBusAbstractInterface::connectNotify(NameLostSignal);

    else if (signal == serviceOwnerChangedSignal) {

        static bool warningPrinted = false;

        if (!warningPrinted) {

            qWarning("Connecting to deprecated signal QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString)");

            warningPrinted = true;

        }

        QDBusAbstractInterface::connectNotify(NameOwnerChangedSignal);

    }

}

/*!

    \internal

*/

void QDBusConnectionInterface::disconnectNotify(const QMetaMethod &signal)

{

    // translate the signal names to what we really want

    // this avoids setting hooks for signals that don't exist on the bus

    static const QMetaMethod serviceRegisteredSignal = QMetaMethod::fromSignal(&QDBusConnectionInterface::serviceRegistered);

    static const QMetaMethod serviceUnregisteredSignal = QMetaMethod::fromSignal(&QDBusConnectionInterface::serviceUnregistered);

    static const QMetaMethod serviceOwnerChangedSignal = QMetaMethod::fromSignal(&QDBusConnectionInterface::serviceOwnerChanged);

    static const QMetaMethod NameAcquiredSignal = QMetaMethod::fromSignal(&QDBusConnectionInterface::NameAcquired);

    static const QMetaMethod NameLostSignal = QMetaMethod::fromSignal(&QDBusConnectionInterface::NameLost);

    static const QMetaMethod NameOwnerChangedSignal = QMetaMethod::fromSignal(&QDBusConnectionInterface::NameOwnerChanged);

    if (signal == serviceRegisteredSignal)

        QDBusAbstractInterface::disconnectNotify(NameAcquiredSignal);

    else if (signal == serviceUnregisteredSignal)

        QDBusAbstractInterface::disconnectNotify(NameLostSignal);

    else if (signal == serviceOwnerChangedSignal)

        QDBusAbstractInterface::disconnectNotify(NameOwnerChangedSignal);

}

// signals

/*!

    \fn QDBusConnectionInterface::serviceRegistered(const QString &service)

    This signal is emitted by the D-Bus server when the bus service

    name (unique connection name or well-known service name) given by

    \a service is acquired by this application.

    Acquisition happens after this application has requested a name using

    registerService().

*/

/*!

    \fn QDBusConnectionInterface::serviceUnregistered(const QString &service)

    This signal is emitted by the D-Bus server when this application

    loses ownership of the bus service name given by \a service.

*/

/*!

    \fn QDBusConnectionInterface::serviceOwnerChanged(const QString &name, const QString &oldOwner, const QString &newOwner)

    \deprecated

    Use QDBusServiceWatcher instead.

    This signal is emitted by the D-Bus server whenever a service

    ownership change happens in the bus, including apparition and

    disparition of names.

    This signal means the application \a oldOwner lost ownership of

    bus name \a name to application \a newOwner. If \a oldOwner is an

    empty string, it means the name \a name has just been created; if

    \a newOwner is empty, the name \a name has no current owner and is

    no longer available.

    \note connecting to this signal will make the application listen for and

    receive every single service ownership change on the bus. Depending on

    how many services are running, this make the application be activated to

    receive more signals than it needs. To avoid this problem, use the

    QDBusServiceWatcher class, which can listen for specific changes.

*/

/*!

  \fn void QDBusConnectionInterface::callWithCallbackFailed(const QDBusError &error, const QDBusMessage &call)

  This signal is emitted when there is an error during a

  QDBusConnection::callWithCallback(). \a error specifies the error.

  \a call is the message that couldn't be delivered.

  \sa QDBusConnection::callWithCallback()

 */

QT_END_NAMESPACE

#include "moc_qdbusconnectioninterface.cpp"

#endif // QT_NO_DBUS