WireGuard for MacOS (#248)

* WireGuard for MacOS
* Fix openvpn block-outside-dns

client/mozilla/shared/signalhandler.h

@@ -0,0 +1,31 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef SIGNALHANDLER_H
+#define SIGNALHANDLER_H
+
+#include <QObject>
+#include <QSocketNotifier>
+
+class SignalHandler final : public QObject {
+  Q_OBJECT
+
+ public:
+  SignalHandler();
+  ~SignalHandler();
+
+ private slots:
+  void pipeReadReady();
+
+ private:
+  static void saHandler(int signal);
+
+  int m_pipefds[2] = {-1, -1};
+  QSocketNotifier* m_notifier = nullptr;
+
+ signals:
+  void quitRequested();
+};
+
+#endif  // SIGNALHANDLER_H