VPN-4987 [Part 1] - Check for internet connectivity upon activation + V…

…PN-5994 - Inspector command (#8834)

* rebase

* Reachability

* remove m_currentReachability

* Check internet connection during activation

* Rename to isDeviceConnected

* rename signal to isDeviceConnectedChanged

* emit signal when isDeviceConnected is true

* load default backend to access reachability()

* Put this behind a feature flag for now until UI is done

* Only loadDefaultBackend if Qt>=6.4

src/controller.cpp

@@ -4,6 +4,8 @@
 
 #include "controller.h"
 
+#include <QNetworkInformation>
+
 #include "app.h"
 #include "apppermission.h"
 #include "captiveportal/captiveportal.h"
@@ -21,6 +23,7 @@
 #include "models/servercountrymodel.h"
 #include "mozillavpn.h"
 #include "networkrequest.h"
+#include "networkwatcher.h"
 #include "rfc/rfc1112.h"
 #include "rfc/rfc1918.h"
 #include "rfc/rfc4193.h"
@@ -931,6 +934,23 @@ bool Controller::activate(const ServerData& serverData,
       return true;
     }
 
+    if (Feature::get(Feature::Feature_checkConnectivityOnActivation)
+            ->isSupported()) {
+      // Ensure that the device is connected to the Internet.
+      if (MozillaVPN::instance()->networkWatcher()->getReachability() ==
+          QNetworkInformation::Reachability::Disconnected) {
+        logger.debug() << "Internet probe failed during controller activation. "
+                          "Device has no network connectivity.";
+        m_isDeviceConnected = false;
+        emit isDeviceConnectedChanged();
+        return false;
+      }
+      if (!m_isDeviceConnected) {
+        m_isDeviceConnected = true;
+        emit isDeviceConnectedChanged();
+      }
+    }
+
     // Before attempting to enable VPN connection we should check that the
     // subscription is active.
     setState(StateCheckSubscription);

src/controller.h

@@ -57,6 +57,7 @@ class Controller : public QObject, public LogSerializer {
   void updateRequired();
   void deleteOSTunnelConfig();
   void startHandshakeTimer();
+  bool isDeviceConnected() const { return m_isDeviceConnected; }
 
   const ServerData& currentServer() const { return m_serverData; }
 
@@ -109,6 +110,8 @@ class Controller : public QObject, public LogSerializer {
                  NOTIFY enableDisconnectInConfirmingChanged);
   Q_PROPERTY(bool silentServerSwitchingSupported READ
                  silentServerSwitchingSupported CONSTANT);
+  Q_PROPERTY(bool isDeviceConnected READ isDeviceConnected NOTIFY
+                 isDeviceConnectedChanged);
 
 #ifdef MZ_DUMMY
   // This is just for testing purposes. Not exposed in prod.
@@ -141,6 +144,7 @@ class Controller : public QObject, public LogSerializer {
   void readyToBackendFailure();
   void readyToServerUnavailable(bool pingReceived);
   void activationBlockedForCaptivePortal();
+  void isDeviceConnectedChanged();
 
 #ifdef MZ_DUMMY
   void currentServerChanged();
@@ -204,6 +208,7 @@ class Controller : public QObject, public LogSerializer {
 
   QScopedPointer<ControllerImpl> m_impl;
   bool m_portalDetected = false;
+  bool m_isDeviceConnected = true;
 
   // Server data can change while the controller is busy completing an
   // activation or a server switch because they are managed by the

src/feature/featurelist.h

@@ -68,6 +68,13 @@ FEATURE(captivePortal,          // Feature ID
         QStringList(),          // feature dependencies
         FeatureCallback_captivePortal)
 
+FEATURE(checkConnectivityOnActivation,       // Feature ID
+        "Check Connectivity On Activation",  // Feature name
+        FeatureCallback_true,                // Can be flipped on
+        FeatureCallback_true,                // Can be flipped off
+        QStringList(),                       // feature dependencies
+        FeatureCallback_false)
+
 FEATURE(customDNS,              // Feature ID
         "Custom DNS",           // Feature name
         FeatureCallback_true,   // Can be flipped on

src/mozillavpn.cpp

@@ -2162,6 +2162,20 @@ void MozillaVPN::registerInspectorCommands() {
         return QJsonObject();
       });
 
+  InspectorHandler::registerCommand(
+      "force_no_network",
+      "Mock the internet connection being down by passing true, pass false to "
+      "restore",
+      1, [](InspectorHandler*, const QList<QByteArray>& arguments) {
+        QJsonObject obj;
+        QByteArray byteArray = arguments[1].toLower();
+        // Check if the byte array contains the string "true"
+        bool forceDisconnection = byteArray.contains("true");
+        MozillaVPN::instance()->networkWatcher()->simulateDisconnection(
+            forceDisconnection);
+        return QJsonObject();
+      });
+
   InspectorHandler::registerCommand(
       "force_connection_health",
       "Force VPN connection health stability. Possible values are: stable, "

src/networkwatcher.cpp

@@ -6,6 +6,7 @@
 
 #include <QMetaEnum>
 #include <QNetworkInformation>
+#include <QtGlobal>
 
 #include "controller.h"
 #include "leakdetector.h"
@@ -87,6 +88,13 @@ void NetworkWatcher::initialize() {
     m_impl->start();
   }
 
+#if QT_VERSION >= QT_VERSION_CHECK(6, 4, 0)
+  // This call creates an instance of QNetworkInformation which can be used
+  // later on to check other network related attributes such as network type, or
+  // whether or not the network is behind captive portal.
+  QNetworkInformation::loadDefaultBackend();
+#endif
+
   connect(settingsHolder, &SettingsHolder::unsecuredNetworkAlertChanged, this,
           &NetworkWatcher::settingsChanged);
   connect(settingsHolder, &SettingsHolder::captivePortalAlertChanged, this,
@@ -170,8 +178,14 @@ void NetworkWatcher::notificationClicked(NotificationHandler::Message message) {
 }
 
 QNetworkInformation::Reachability NetworkWatcher::getReachability() {
-  if (QNetworkInformation::instance()) {
+  if (m_simulatedDisconnection) {
+    return QNetworkInformation::Reachability::Disconnected;
+  } else if (QNetworkInformation::instance()) {
     return QNetworkInformation::instance()->reachability();
   }
   return QNetworkInformation::Reachability::Unknown;
 }
+
+void NetworkWatcher::simulateDisconnection(bool simulatedDisconnection) {
+  m_simulatedDisconnection = simulatedDisconnection;
+}

src/networkwatcher.h

@@ -24,8 +24,11 @@ class NetworkWatcher final : public QObject {
 
   void initialize();
 
-  // public for the inspector.
+  // Public for the Inspector.
   void unsecuredNetwork(const QString& networkName, const QString& networkId);
+  // Used for the Inspector. simulateOffline = true to mock being disconnected,
+  // false to restore.
+  void simulateDisconnection(bool simulatedDisconnection);
 
   QNetworkInformation::Reachability getReachability();
 
@@ -48,6 +51,9 @@ class NetworkWatcher final : public QObject {
 
   // This is used to connect NotificationHandler lazily.
   bool m_firstNotification = true;
+
+  // Used to simulate network disconnection in the Inspector
+  bool m_simulatedDisconnection = false;
 };
 
 #endif  // NETWORKWATCHER_H