Add a QNetworkInformation backend based on GNetworkMonitor

GNetworkMonitor can get information from 3 sources:
* org.freedesktop.portal.NetworkMonitor
* NetworkManager
* netlink

Change-Id: Icfafe6af42148f26360449f1262093ffc6b0613a
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>

3 files changed, 175 insertions, 0 deletions

diff --git a/src/plugins/networkinformation/CMakeLists.txt b/src/plugins/networkinformation/CMakeLists.txt
index 142031c62a..ddb907d1e7 100644
--- a/src/plugins/networkinformation/CMakeLists.txt
+++ b/src/plugins/networkinformation/CMakeLists.txt
@@ -13,3 +13,7 @@ endif()
 if(ANDROID)
     add_subdirectory(android)
 endif()
+
+if(QT_FEATURE_glib)
+    add_subdirectory(glib)
+endif()
diff --git a/src/plugins/networkinformation/glib/CMakeLists.txt b/src/plugins/networkinformation/glib/CMakeLists.txt
new file mode 100644
index 0000000000..17a16a15c0
--- /dev/null
+++ b/src/plugins/networkinformation/glib/CMakeLists.txt
@@ -0,0 +1,14 @@
+qt_internal_add_plugin(QGlibNetworkInformationPlugin
+    OUTPUT_NAME qglib
+    CLASS_NAME QGlibNetworkInformationBackendFactory
+    PLUGIN_TYPE networkinformation
+    DEFAULT_IF LINUX
+    SOURCES
+        qglibnetworkinformationbackend.cpp
+    LIBRARIES
+        Qt::NetworkPrivate
+        GLIB2::GOBJECT
+        GLIB2::GIO
+    DEFINES
+        QT_NO_SIGNALS_SLOTS_KEYWORDS
+)
diff --git a/src/plugins/networkinformation/glib/qglibnetworkinformationbackend.cpp b/src/plugins/networkinformation/glib/qglibnetworkinformationbackend.cpp
new file mode 100644
index 0000000000..f26079b041
--- /dev/null
+++ b/src/plugins/networkinformation/glib/qglibnetworkinformationbackend.cpp
@@ -0,0 +1,157 @@
+/****************************************************************************
+**
+** Copyright (C) 2021 Ilya Fedin <fedin-ilja2010@ya.ru>
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtNetwork module 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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtNetwork/private/qnetworkinformation_p.h>
+
+#include <QtCore/qglobal.h>
+#include <QtCore/private/qobject_p.h>
+
+#include <gio/gio.h>
+
+QT_BEGIN_NAMESPACE
+Q_DECLARE_LOGGING_CATEGORY(lcNetInfoGlib)
+Q_LOGGING_CATEGORY(lcNetInfoGlib, "qt.network.info.glib");
+
+namespace {
+QNetworkInformation::Reachability reachabilityFromGNetworkConnectivity(GNetworkConnectivity connectivity)
+{
+    switch (connectivity) {
+    case G_NETWORK_CONNECTIVITY_LOCAL:
+        return QNetworkInformation::Reachability::Disconnected;
+    case G_NETWORK_CONNECTIVITY_LIMITED:
+    case G_NETWORK_CONNECTIVITY_PORTAL:
+        return QNetworkInformation::Reachability::Site;
+    case G_NETWORK_CONNECTIVITY_FULL:
+        return QNetworkInformation::Reachability::Online;
+    }
+    return QNetworkInformation::Reachability::Unknown;
+}
+}
+
+static QString backendName = QStringLiteral("glib");
+
+class QGlibNetworkInformationBackend : public QNetworkInformationBackend
+{
+    Q_OBJECT
+public:
+    QGlibNetworkInformationBackend();
+    ~QGlibNetworkInformationBackend();
+
+    QString name() const override { return backendName; }
+    QNetworkInformation::Features featuresSupported() const override
+    {
+        if (!isValid())
+            return {};
+        return featuresSupportedStatic();
+    }
+
+    static QNetworkInformation::Features featuresSupportedStatic()
+    {
+        using Feature = QNetworkInformation::Feature;
+        return QNetworkInformation::Features(Feature::Reachability | Feature::CaptivePortal);
+    }
+
+    bool isValid() const;
+
+private:
+    Q_DISABLE_COPY_MOVE(QGlibNetworkInformationBackend)
+
+    static void updateInformation(QGlibNetworkInformationBackend *backend);
+
+    GNetworkMonitor *networkMonitor = nullptr;
+    gulong handlerId = 0;
+};
+
+class QGlibNetworkInformationBackendFactory : public QNetworkInformationBackendFactory
+{
+    Q_OBJECT
+    Q_PLUGIN_METADATA(IID QNetworkInformationBackendFactory_iid)
+    Q_INTERFACES(QNetworkInformationBackendFactory)
+public:
+    QGlibNetworkInformationBackendFactory() = default;
+    ~QGlibNetworkInformationBackendFactory() = default;
+    QString name() const override { return backendName; }
+    QNetworkInformation::Features featuresSupported() const override
+    {
+        return QGlibNetworkInformationBackend::featuresSupportedStatic();
+    }
+
+    QNetworkInformationBackend *create(QNetworkInformation::Features requiredFeatures) const override
+    {
+        if ((requiredFeatures & featuresSupported()) != requiredFeatures)
+            return nullptr;
+        auto backend = new QGlibNetworkInformationBackend();
+        if (!backend->isValid())
+            delete std::exchange(backend, nullptr);
+        return backend;
+    }
+private:
+    Q_DISABLE_COPY_MOVE(QGlibNetworkInformationBackendFactory)
+};
+
+QGlibNetworkInformationBackend::QGlibNetworkInformationBackend()
+: networkMonitor(g_network_monitor_get_default())
+{
+    updateInformation(this);
+
+    handlerId = g_signal_connect_swapped(networkMonitor, "notify::connectivity",
+                                         G_CALLBACK(updateInformation), this);
+}
+
+QGlibNetworkInformationBackend::~QGlibNetworkInformationBackend()
+{
+    g_signal_handler_disconnect(networkMonitor, handlerId);
+}
+
+bool QGlibNetworkInformationBackend::isValid() const
+{
+    return G_OBJECT_TYPE_NAME(networkMonitor) != QLatin1String("GNetworkMonitorBase");
+}
+
+void QGlibNetworkInformationBackend::updateInformation(QGlibNetworkInformationBackend *backend)
+{
+    const auto connectivityState = g_network_monitor_get_connectivity(backend->networkMonitor);
+    const bool behindPortal = (connectivityState == G_NETWORK_CONNECTIVITY_PORTAL);
+    backend->setReachability(reachabilityFromGNetworkConnectivity(connectivityState));
+    backend->setBehindCaptivePortal(behindPortal);
+}
+
+QT_END_NAMESPACE
+
+#include "qglibnetworkinformationbackend.moc"