feature: fillswitch strict mode (#1333)

* Add allowed DNS list for killswitch

* Windows killswitch strict mode backend part

* Killswitch strict mode for Linux and MacOS

* Windows fixes

* feature: Add Kill Switch settings page with strict mode option

* fix windows build after merge

* Refresh killswitch mode when it toggled

* Use HLM to store strictMode flag

* Some Linux updates

* feat: Enhance VerticalRadioButton with improved styling and disabled states

* Refresh killSwitch state update

* Fix build

* refactor: Modularize header components

* Change kill switch radio button styling

* Fix strict kill switch mode handling

* Refactor: Replace HeaderType with new Types for headers in QML pages

* Remove deprecated HeaderType QML component

* Refresh strict mode killswitch after global toggle change

* Implement model, controller and UI for killswitch dns exceptions

* Connect backend part and UI

* Change label text to DNS exceptions

* Remove HeaderType from PageSettingsApiDevices

* Some pretty fixes

* Fix problem with definition sequence of PageSettingsKillSwitchExceptions.pml elements

* Add exclusion method for Windows firewall

* Change ubuntu version in deploy script

* Update ubuntu version in GH actions

* Add confirmation popup for strict killswitch mode

* Add qt standard path for build script

* Add method to killswitch for expanding strickt mode exceptions list and fix allowTrafficTo() for Windows. Also Added cache in KillSwitch class for exceptions

* Add insertion of gateway address to strict killswitch exceptions

* Review fixes

* buildfix and naming

---------

Co-authored-by: aiamnezia <ai@amnezia.org>

client/ui/controllers/allowedDnsController.cpp

@@ -0,0 +1,101 @@
+#include "allowedDnsController.h"
+
+#include <QFile>
+#include <QStandardPaths>
+#include <QJsonDocument>
+#include <QJsonArray>
+#include <QJsonObject>
+
+#include "systemController.h"
+#include "core/networkUtilities.h"
+#include "core/defs.h"
+
+AllowedDnsController::AllowedDnsController(const std::shared_ptr<Settings> &settings,
+                                           const QSharedPointer<AllowedDnsModel> &allowedDnsModel,
+                                           QObject *parent)
+    : QObject(parent), m_settings(settings), m_allowedDnsModel(allowedDnsModel)
+{
+}
+
+void AllowedDnsController::addDns(QString ip)
+{
+    if (ip.isEmpty()) {
+        return;
+    }
+
+    if (!NetworkUtilities::ipAddressRegExp().match(ip).hasMatch()) {
+        emit errorOccurred(tr("The address does not look like a valid IP address"));
+        return;
+    }
+
+    if (m_allowedDnsModel->addDns(ip)) {
+        emit finished(tr("New DNS server added: %1").arg(ip));
+    } else {
+        emit errorOccurred(tr("DNS server already exists: %1").arg(ip));
+    }
+}
+
+void AllowedDnsController::removeDns(int index)
+{
+    auto modelIndex = m_allowedDnsModel->index(index);
+    auto ip = m_allowedDnsModel->data(modelIndex, AllowedDnsModel::Roles::IpRole).toString();
+    m_allowedDnsModel->removeDns(modelIndex);
+
+    emit finished(tr("DNS server removed: %1").arg(ip));
+}
+
+void AllowedDnsController::importDns(const QString &fileName, bool replaceExisting)
+{
+    QByteArray jsonData;
+    if (!SystemController::readFile(fileName, jsonData)) {
+        emit errorOccurred(tr("Can't open file: %1").arg(fileName));
+        return;
+    }
+
+    QJsonDocument jsonDocument = QJsonDocument::fromJson(jsonData);
+    if (jsonDocument.isNull()) {
+        emit errorOccurred(tr("Failed to parse JSON data from file: %1").arg(fileName));
+        return;
+    }
+
+    if (!jsonDocument.isArray()) {
+        emit errorOccurred(tr("The JSON data is not an array in file: %1").arg(fileName));
+        return;
+    }
+
+    auto jsonArray = jsonDocument.array();
+    QStringList dnsServers;
+
+    for (auto jsonValue : jsonArray) {
+        auto ip = jsonValue.toString();
+        
+        if (!NetworkUtilities::ipAddressRegExp().match(ip).hasMatch()) {
+            qDebug() << ip << " is not a valid IP address";
+            continue;
+        }
+        
+        dnsServers.append(ip);
+    }
+
+    m_allowedDnsModel->addDnsList(dnsServers, replaceExisting);
+
+    emit finished(tr("Import completed"));
+}
+
+void AllowedDnsController::exportDns(const QString &fileName)
+{
+    auto dnsServers = m_allowedDnsModel->getCurrentDnsServers();
+
+    QJsonArray jsonArray;
+
+    for (const auto &ip : dnsServers) {
+        jsonArray.append(ip);
+    }
+
+    QJsonDocument jsonDocument(jsonArray);
+    QByteArray jsonData = jsonDocument.toJson();
+
+    SystemController::saveFile(fileName, jsonData);
+
+    emit finished(tr("Export completed"));
+} 

client/ui/controllers/allowedDnsController.h

@@ -0,0 +1,35 @@
+#ifndef ALLOWEDDNSCONTROLLER_H
+#define ALLOWEDDNSCONTROLLER_H
+
+#include <QObject>
+
+#include "settings.h"
+#include "ui/models/allowed_dns_model.h"
+
+class AllowedDnsController : public QObject
+{
+    Q_OBJECT
+public:
+    explicit AllowedDnsController(const std::shared_ptr<Settings> &settings,
+                                  const QSharedPointer<AllowedDnsModel> &allowedDnsModel,
+                                  QObject *parent = nullptr);
+
+public slots:
+    void addDns(QString ip);
+    void removeDns(int index);
+
+    void importDns(const QString &fileName, bool replaceExisting);
+    void exportDns(const QString &fileName);
+
+signals:
+    void errorOccurred(const QString &errorMessage);
+    void finished(const QString &message);
+
+    void saveFile(const QString &fileName, const QString &data);
+
+private:
+    std::shared_ptr<Settings> m_settings;
+    QSharedPointer<AllowedDnsModel> m_allowedDnsModel;
+};
+
+#endif // ALLOWEDDNSCONTROLLER_H 

client/ui/controllers/pageController.h

@@ -31,13 +31,15 @@ namespace PageLoader
         PageSettingsLogging,
         PageSettingsSplitTunneling,
         PageSettingsAppSplitTunneling,
+        PageSettingsKillSwitch,
         PageSettingsApiServerInfo,
         PageSettingsApiAvailableCountries,
         PageSettingsApiSupport,
         PageSettingsApiInstructions,
         PageSettingsApiNativeConfigs,
         PageSettingsApiDevices,
-
+        PageSettingsKillSwitchExceptions,
+        
         PageServiceSftpSettings,
         PageServiceTorWebsiteSettings,
         PageServiceDnsSettings,

client/ui/controllers/settingsController.cpp

@@ -245,6 +245,23 @@ bool SettingsController::isKillSwitchEnabled()
 void SettingsController::toggleKillSwitch(bool enable)
 {
     m_settings->setKillSwitchEnabled(enable);
+    emit killSwitchEnabledChanged();
+    if (enable == false) {
+        emit strictKillSwitchEnabledChanged(false);
+    } else {
+        emit strictKillSwitchEnabledChanged(isStrictKillSwitchEnabled());
+    }
+}
+
+bool SettingsController::isStrictKillSwitchEnabled()
+{
+    return m_settings->isStrictKillSwitchEnabled();
+}
+
+void SettingsController::toggleStrictKillSwitch(bool enable)
+{
+    m_settings->setStrictKillSwitchEnabled(enable);
+    emit strictKillSwitchEnabledChanged(enable);
 }
 
 bool SettingsController::isNotificationPermissionGranted()

client/ui/controllers/settingsController.h

@@ -24,6 +24,8 @@ public:
     Q_PROPERTY(QString secondaryDns READ getSecondaryDns WRITE setSecondaryDns NOTIFY secondaryDnsChanged)
     Q_PROPERTY(bool isLoggingEnabled READ isLoggingEnabled WRITE toggleLogging NOTIFY loggingStateChanged)
     Q_PROPERTY(bool isNotificationPermissionGranted READ isNotificationPermissionGranted NOTIFY onNotificationStateChanged)
+    Q_PROPERTY(bool isKillSwitchEnabled READ isKillSwitchEnabled WRITE toggleKillSwitch NOTIFY killSwitchEnabledChanged)
+    Q_PROPERTY(bool strictKillSwitchEnabled READ isStrictKillSwitchEnabled WRITE toggleStrictKillSwitch NOTIFY strictKillSwitchEnabledChanged)
 
     Q_PROPERTY(bool isDevModeEnabled READ isDevModeEnabled NOTIFY devModeEnabled)
     Q_PROPERTY(QString gatewayEndpoint READ getGatewayEndpoint WRITE setGatewayEndpoint NOTIFY gatewayEndpointChanged)
@@ -75,6 +77,9 @@ public slots:
     bool isKillSwitchEnabled();
     void toggleKillSwitch(bool enable);
 
+    bool isStrictKillSwitchEnabled();
+    void toggleStrictKillSwitch(bool enable);
+
     bool isNotificationPermissionGranted();
     void requestNotificationPermission();
 
@@ -98,6 +103,8 @@ signals:
     void primaryDnsChanged();
     void secondaryDnsChanged();
     void loggingStateChanged();
+    void killSwitchEnabledChanged();
+    void strictKillSwitchEnabledChanged(bool enabled);
 
     void restoreBackupFinished();
     void changeSettingsFinished(const QString &finishedMessage);