Fix static linking when bearer management plugins are built

The bearer plugins include copies of moc generated code that results in
duplicate symbols when static linking pulls in multiple bearer plugins.
Instead of relying on toolchain defined behavior, this patch moves the
code that is shared into the shared library as private API. This way it
will exist only once in memory and once at link time, resulting no
linking errors about duplicate symbols.

Fixes: QTBUG-79211
Change-Id: Iafa45c234e7fdd998971fc9cb7116334d08907bc
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>

4 files changed, 661 insertions, 0 deletions

diff --git a/src/network/bearer/bearer.pri b/src/network/bearer/bearer.pri
index d58d5ec168..bcb7a5971e 100644
--- a/src/network/bearer/bearer.pri
+++ b/src/network/bearer/bearer.pri
@@ -6,11 +6,14 @@ HEADERS += bearer/qnetworkconfiguration.h \
            bearer/qnetworkconfigmanager_p.h \
            bearer/qnetworkconfiguration_p.h \
            bearer/qnetworksession_p.h \
+           bearer/qnetworksession_impl_p.h \
            bearer/qbearerengine_p.h \
+           bearer/qbearerengine_impl_p.h \
            bearer/qbearerplugin_p.h \
            bearer/qsharednetworksession_p.h
 
 SOURCES += bearer/qnetworksession.cpp \
+           bearer/qnetworksession_impl.cpp \
            bearer/qnetworkconfigmanager.cpp \
            bearer/qnetworkconfiguration.cpp \
            bearer/qnetworkconfigmanager_p.cpp \
diff --git a/src/network/bearer/qbearerengine_impl_p.h b/src/network/bearer/qbearerengine_impl_p.h
new file mode 100644
index 0000000000..4221b73276
--- /dev/null
+++ b/src/network/bearer/qbearerengine_impl_p.h
@@ -0,0 +1,85 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt 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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QBEARERENGINE_IMPL_H
+#define QBEARERENGINE_IMPL_H
+
+#include <QtNetwork/private/qbearerengine_p.h>
+
+#ifndef QT_NO_BEARERMANAGEMENT
+
+QT_BEGIN_NAMESPACE
+
+class Q_NETWORK_EXPORT QBearerEngineImpl : public QBearerEngine
+{
+    Q_OBJECT
+
+public:
+    enum ConnectionError {
+        InterfaceLookupError = 0,
+        ConnectError,
+        OperationNotSupported,
+        DisconnectionError,
+    };
+
+    QBearerEngineImpl(QObject *parent = nullptr) : QBearerEngine(parent) {}
+    ~QBearerEngineImpl() {}
+
+    virtual void connectToId(const QString &id) = 0;
+    virtual void disconnectFromId(const QString &id) = 0;
+
+    virtual QString getInterfaceFromId(const QString &id) = 0;
+
+    virtual QNetworkSession::State sessionStateForId(const QString &id) = 0;
+
+    virtual quint64 bytesWritten(const QString &) { return Q_UINT64_C(0); }
+    virtual quint64 bytesReceived(const QString &) { return Q_UINT64_C(0); }
+    virtual quint64 startTime(const QString &) { return Q_UINT64_C(0); }
+
+Q_SIGNALS:
+    void connectionError(const QString &id, QBearerEngineImpl::ConnectionError error);
+};
+
+QT_END_NAMESPACE
+
+Q_DECLARE_METATYPE(QBearerEngineImpl::ConnectionError)
+
+#endif // QT_NO_BEARERMANAGEMENT
+
+#endif // QBEARERENGINE_IMPL_H
diff --git a/src/network/bearer/qnetworksession_impl.cpp b/src/network/bearer/qnetworksession_impl.cpp
new file mode 100644
index 0000000000..4b8631d4db
--- /dev/null
+++ b/src/network/bearer/qnetworksession_impl.cpp
@@ -0,0 +1,439 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt 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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+// see comment in ../platformdefs_win.h.
+#define WIN32_LEAN_AND_MEAN 1
+
+#include "qnetworksession_impl_p.h"
+#include "qbearerengine_impl_p.h"
+
+#include <QtNetwork/qnetworksession.h>
+#include <QtNetwork/private/qnetworkconfigmanager_p.h>
+
+#include <QtCore/qdatetime.h>
+#include <QtCore/qdebug.h>
+#include <QtCore/qmutex.h>
+#include <QtCore/qstringlist.h>
+
+#ifndef QT_NO_BEARERMANAGEMENT
+
+QT_BEGIN_NAMESPACE
+
+static QBearerEngineImpl *getEngineFromId(const QString &id)
+{
+    QNetworkConfigurationManagerPrivate *priv = qNetworkConfigurationManagerPrivate();
+    if (priv) {
+        const auto engines = priv->engines();
+        for (QBearerEngine *engine : engines) {
+            QBearerEngineImpl *engineImpl = qobject_cast<QBearerEngineImpl *>(engine);
+            if (engineImpl && engineImpl->hasIdentifier(id))
+                return engineImpl;
+        }
+    }
+
+    return 0;
+}
+
+class QNetworkSessionManagerPrivate : public QObject
+{
+    Q_OBJECT
+
+public:
+    QNetworkSessionManagerPrivate(QObject *parent = 0) : QObject(parent) {}
+    ~QNetworkSessionManagerPrivate() {}
+
+    inline void forceSessionClose(const QNetworkConfiguration &config)
+    { emit forcedSessionClose(config); }
+
+Q_SIGNALS:
+    void forcedSessionClose(const QNetworkConfiguration &config);
+};
+
+Q_GLOBAL_STATIC(QNetworkSessionManagerPrivate, sessionManager);
+
+void QNetworkSessionPrivateImpl::syncStateWithInterface()
+{
+    connect(sessionManager(), SIGNAL(forcedSessionClose(QNetworkConfiguration)),
+            this, SLOT(forcedSessionClose(QNetworkConfiguration)));
+
+    opened = false;
+    isOpen = false;
+    state = QNetworkSession::Invalid;
+    lastError = QNetworkSession::UnknownSessionError;
+
+    qRegisterMetaType<QBearerEngineImpl::ConnectionError>();
+
+    switch (publicConfig.type()) {
+    case QNetworkConfiguration::InternetAccessPoint:
+        activeConfig = publicConfig;
+        engine = getEngineFromId(activeConfig.identifier());
+        if (engine) {
+            qRegisterMetaType<QNetworkConfigurationPrivatePointer>();
+            connect(engine, SIGNAL(configurationChanged(QNetworkConfigurationPrivatePointer)),
+                    this, SLOT(configurationChanged(QNetworkConfigurationPrivatePointer)),
+                    Qt::QueuedConnection);
+            connect(engine, SIGNAL(connectionError(QString,QBearerEngineImpl::ConnectionError)),
+                    this, SLOT(connectionError(QString,QBearerEngineImpl::ConnectionError)),
+                    Qt::QueuedConnection);
+        }
+        break;
+    case QNetworkConfiguration::ServiceNetwork:
+        serviceConfig = publicConfig;
+        // Defer setting engine and signals until open().
+        Q_FALLTHROUGH();
+    case QNetworkConfiguration::UserChoice:
+        // Defer setting serviceConfig and activeConfig until open().
+        Q_FALLTHROUGH();
+    default:
+        engine = 0;
+    }
+
+    networkConfigurationsChanged();
+}
+
+void QNetworkSessionPrivateImpl::open()
+{
+    if (serviceConfig.isValid()) {
+        lastError = QNetworkSession::OperationNotSupportedError;
+        emit QNetworkSessionPrivate::error(lastError);
+    } else if (!isOpen) {
+        if ((activeConfig.state() & QNetworkConfiguration::Discovered) != QNetworkConfiguration::Discovered) {
+            lastError = QNetworkSession::InvalidConfigurationError;
+            state = QNetworkSession::Invalid;
+            emit stateChanged(state);
+            emit QNetworkSessionPrivate::error(lastError);
+            return;
+        }
+        opened = true;
+
+        if ((activeConfig.state() & QNetworkConfiguration::Active) != QNetworkConfiguration::Active &&
+            (activeConfig.state() & QNetworkConfiguration::Discovered) == QNetworkConfiguration::Discovered) {
+            state = QNetworkSession::Connecting;
+            emit stateChanged(state);
+
+            engine->connectToId(activeConfig.identifier());
+        }
+
+        isOpen = (activeConfig.state() & QNetworkConfiguration::Active) == QNetworkConfiguration::Active;
+        if (isOpen)
+            emit quitPendingWaitsForOpened();
+    }
+}
+
+void QNetworkSessionPrivateImpl::close()
+{
+    if (serviceConfig.isValid()) {
+        lastError = QNetworkSession::OperationNotSupportedError;
+        emit QNetworkSessionPrivate::error(lastError);
+    } else if (isOpen) {
+        opened = false;
+        isOpen = false;
+        emit closed();
+    }
+}
+
+void QNetworkSessionPrivateImpl::stop()
+{
+    if (serviceConfig.isValid()) {
+        lastError = QNetworkSession::OperationNotSupportedError;
+        emit QNetworkSessionPrivate::error(lastError);
+    } else {
+        if ((activeConfig.state() & QNetworkConfiguration::Active) == QNetworkConfiguration::Active) {
+            state = QNetworkSession::Closing;
+            emit stateChanged(state);
+
+            engine->disconnectFromId(activeConfig.identifier());
+
+            sessionManager()->forceSessionClose(activeConfig);
+        }
+
+        opened = false;
+        isOpen = false;
+        emit closed();
+    }
+}
+
+void QNetworkSessionPrivateImpl::migrate()
+{
+}
+
+void QNetworkSessionPrivateImpl::accept()
+{
+}
+
+void QNetworkSessionPrivateImpl::ignore()
+{
+}
+
+void QNetworkSessionPrivateImpl::reject()
+{
+}
+
+#ifndef QT_NO_NETWORKINTERFACE
+QNetworkInterface QNetworkSessionPrivateImpl::currentInterface() const
+{
+    if (!engine || state != QNetworkSession::Connected || !publicConfig.isValid())
+        return QNetworkInterface();
+
+    QString iface = engine->getInterfaceFromId(activeConfig.identifier());
+    if (iface.isEmpty())
+        return QNetworkInterface();
+    return QNetworkInterface::interfaceFromName(iface);
+}
+#endif
+
+QVariant QNetworkSessionPrivateImpl::sessionProperty(const QString &key) const
+{
+    if (key == QLatin1String("AutoCloseSessionTimeout")) {
+        if (engine && engine->requiresPolling() &&
+            !(engine->capabilities() & QNetworkConfigurationManager::CanStartAndStopInterfaces)) {
+            return sessionTimeout >= 0 ? sessionTimeout * 10000 : -1;
+        }
+    }
+
+    return QVariant();
+}
+
+void QNetworkSessionPrivateImpl::setSessionProperty(const QString &key, const QVariant &value)
+{
+    if (key == QLatin1String("AutoCloseSessionTimeout")) {
+        if (engine && engine->requiresPolling() &&
+            !(engine->capabilities() & QNetworkConfigurationManager::CanStartAndStopInterfaces)) {
+            int timeout = value.toInt();
+            if (timeout >= 0) {
+                connect(engine, SIGNAL(updateCompleted()),
+                        this, SLOT(decrementTimeout()), Qt::UniqueConnection);
+                sessionTimeout = timeout / 10000;   // convert to poll intervals
+            } else {
+                disconnect(engine, SIGNAL(updateCompleted()), this, SLOT(decrementTimeout()));
+                sessionTimeout = -1;
+            }
+        }
+    }
+}
+
+QString QNetworkSessionPrivateImpl::errorString() const
+{
+    switch (lastError) {
+    case QNetworkSession::UnknownSessionError:
+        return tr("Unknown session error.");
+    case QNetworkSession::SessionAbortedError:
+        return tr("The session was aborted by the user or system.");
+    case QNetworkSession::OperationNotSupportedError:
+        return tr("The requested operation is not supported by the system.");
+    case QNetworkSession::InvalidConfigurationError:
+        return tr("The specified configuration cannot be used.");
+    case QNetworkSession::RoamingError:
+        return tr("Roaming was aborted or is not possible.");
+    default:
+        break;
+    }
+
+    return QString();
+}
+
+QNetworkSession::SessionError QNetworkSessionPrivateImpl::error() const
+{
+    return lastError;
+}
+
+quint64 QNetworkSessionPrivateImpl::bytesWritten() const
+{
+    if (engine && state == QNetworkSession::Connected)
+        return engine->bytesWritten(activeConfig.identifier());
+    return Q_UINT64_C(0);
+}
+
+quint64 QNetworkSessionPrivateImpl::bytesReceived() const
+{
+    if (engine && state == QNetworkSession::Connected)
+        return engine->bytesReceived(activeConfig.identifier());
+    return Q_UINT64_C(0);
+}
+
+quint64 QNetworkSessionPrivateImpl::activeTime() const
+{
+    if (state == QNetworkSession::Connected && startTime != Q_UINT64_C(0))
+        return QDateTime::currentSecsSinceEpoch() - startTime;
+    return Q_UINT64_C(0);
+}
+
+QNetworkSession::UsagePolicies QNetworkSessionPrivateImpl::usagePolicies() const
+{
+    return currentPolicies;
+}
+
+void QNetworkSessionPrivateImpl::setUsagePolicies(QNetworkSession::UsagePolicies newPolicies)
+{
+    if (newPolicies != currentPolicies) {
+        currentPolicies = newPolicies;
+        emit usagePoliciesChanged(currentPolicies);
+    }
+}
+
+void QNetworkSessionPrivateImpl::updateStateFromServiceNetwork()
+{
+    QNetworkSession::State oldState = state;
+
+    const auto configs = serviceConfig.children();
+    for (const QNetworkConfiguration &config : configs) {
+        if ((config.state() & QNetworkConfiguration::Active) != QNetworkConfiguration::Active)
+            continue;
+
+        if (activeConfig != config) {
+            if (engine) {
+                disconnect(engine, SIGNAL(connectionError(QString,QBearerEngineImpl::ConnectionError)),
+                           this, SLOT(connectionError(QString,QBearerEngineImpl::ConnectionError)));
+            }
+
+            activeConfig = config;
+            engine = getEngineFromId(activeConfig.identifier());
+
+            if (engine) {
+                connect(engine, SIGNAL(connectionError(QString,QBearerEngineImpl::ConnectionError)),
+                        this, SLOT(connectionError(QString,QBearerEngineImpl::ConnectionError)),
+                        Qt::QueuedConnection);
+            }
+            emit newConfigurationActivated();
+        }
+
+        state = QNetworkSession::Connected;
+        if (state != oldState)
+            emit stateChanged(state);
+
+        return;
+    }
+
+    if (serviceConfig.children().isEmpty())
+        state = QNetworkSession::NotAvailable;
+    else
+        state = QNetworkSession::Disconnected;
+
+    if (state != oldState)
+        emit stateChanged(state);
+}
+
+void QNetworkSessionPrivateImpl::updateStateFromActiveConfig()
+{
+    if (!engine)
+        return;
+
+    QNetworkSession::State oldState = state;
+    state = engine->sessionStateForId(activeConfig.identifier());
+
+    bool oldActive = isOpen;
+    isOpen = (state == QNetworkSession::Connected) ? opened : false;
+
+    if (!oldActive && isOpen)
+        emit quitPendingWaitsForOpened();
+    if (oldActive && !isOpen)
+        emit closed();
+
+    if (oldState != state)
+        emit stateChanged(state);
+}
+
+void QNetworkSessionPrivateImpl::networkConfigurationsChanged()
+{
+    if (serviceConfig.isValid())
+        updateStateFromServiceNetwork();
+    else
+        updateStateFromActiveConfig();
+
+    if (engine)
+        startTime = engine->startTime(activeConfig.identifier());
+}
+
+void QNetworkSessionPrivateImpl::configurationChanged(QNetworkConfigurationPrivatePointer config)
+{
+    if (serviceConfig.isValid() &&
+        (config->id == serviceConfig.identifier() || config->id == activeConfig.identifier())) {
+        updateStateFromServiceNetwork();
+    } else if (config->id == activeConfig.identifier()) {
+        updateStateFromActiveConfig();
+    }
+}
+
+void QNetworkSessionPrivateImpl::forcedSessionClose(const QNetworkConfiguration &config)
+{
+    if (activeConfig == config) {
+        opened = false;
+        isOpen = false;
+
+        emit closed();
+
+        lastError = QNetworkSession::SessionAbortedError;
+        emit QNetworkSessionPrivate::error(lastError);
+    }
+}
+
+void QNetworkSessionPrivateImpl::connectionError(const QString &id, QBearerEngineImpl::ConnectionError error)
+{
+    if (activeConfig.identifier() == id) {
+        networkConfigurationsChanged();
+        switch (error) {
+        case QBearerEngineImpl::OperationNotSupported:
+            lastError = QNetworkSession::OperationNotSupportedError;
+            opened = false;
+            break;
+        case QBearerEngineImpl::InterfaceLookupError:
+        case QBearerEngineImpl::ConnectError:
+        case QBearerEngineImpl::DisconnectionError:
+        default:
+            lastError = QNetworkSession::UnknownSessionError;
+        }
+
+        emit QNetworkSessionPrivate::error(lastError);
+    }
+}
+
+void QNetworkSessionPrivateImpl::decrementTimeout()
+{
+    if (--sessionTimeout <= 0) {
+        disconnect(engine, SIGNAL(updateCompleted()), this, SLOT(decrementTimeout()));
+        sessionTimeout = -1;
+        close();
+    }
+}
+
+QT_END_NAMESPACE
+
+#include "qnetworksession_impl.moc"
+
+#endif // QT_NO_BEARERMANAGEMENT
diff --git a/src/network/bearer/qnetworksession_impl_p.h b/src/network/bearer/qnetworksession_impl_p.h
new file mode 100644
index 0000000000..b174760152
--- /dev/null
+++ b/src/network/bearer/qnetworksession_impl_p.h
@@ -0,0 +1,134 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt 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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QNETWORKSESSION_IMPL_H
+#define QNETWORKSESSION_IMPL_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "qbearerengine_impl_p.h"
+
+#include <QtNetwork/private/qnetworkconfigmanager_p.h>
+#include <QtNetwork/private/qnetworksession_p.h>
+
+#ifndef QT_NO_BEARERMANAGEMENT
+
+QT_BEGIN_NAMESPACE
+
+class QBearerEngineImpl;
+
+class Q_NETWORK_EXPORT QNetworkSessionPrivateImpl : public QNetworkSessionPrivate
+{
+    Q_OBJECT
+
+public:
+    QNetworkSessionPrivateImpl()
+        : engine(nullptr), startTime(0), lastError(QNetworkSession::UnknownSessionError), sessionTimeout(-1), currentPolicies(QNetworkSession::NoPolicy), opened(false)
+    {}
+    ~QNetworkSessionPrivateImpl()
+    {}
+
+    //called by QNetworkSession constructor and ensures
+    //that the state is immediately updated (w/o actually opening
+    //a session). Also this function should take care of
+    //notification hooks to discover future state changes.
+    void syncStateWithInterface() override;
+
+#ifndef QT_NO_NETWORKINTERFACE
+    QNetworkInterface currentInterface() const override;
+#endif
+    QVariant sessionProperty(const QString& key) const override;
+    void setSessionProperty(const QString& key, const QVariant& value) override;
+
+    void open() override;
+    void close() override;
+    void stop() override;
+    void migrate() override;
+    void accept() override;
+    void ignore() override;
+    void reject() override;
+
+    QString errorString() const override; //must return translated string
+    QNetworkSession::SessionError error() const override;
+
+    quint64 bytesWritten() const override;
+    quint64 bytesReceived() const override;
+    quint64 activeTime() const override;
+
+    QNetworkSession::UsagePolicies usagePolicies() const override;
+    void setUsagePolicies(QNetworkSession::UsagePolicies) override;
+
+private Q_SLOTS:
+    void networkConfigurationsChanged();
+    void configurationChanged(QNetworkConfigurationPrivatePointer config);
+    void forcedSessionClose(const QNetworkConfiguration &config);
+    void connectionError(const QString &id, QBearerEngineImpl::ConnectionError error);
+    void decrementTimeout();
+
+private:
+    void updateStateFromServiceNetwork();
+    void updateStateFromActiveConfig();
+
+private:
+    QBearerEngineImpl *engine;
+
+    quint64 startTime;
+
+    QNetworkSession::SessionError lastError;
+
+    int sessionTimeout;
+    QNetworkSession::UsagePolicies currentPolicies;
+
+    bool opened;
+};
+
+QT_END_NAMESPACE
+
+#endif // QT_NO_BEARERMANAGEMENT
+
+#endif // QNETWORKSESSION_IMPL_H