WireGuard for MacOS (#248)

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

client/mozilla/pinghelper.h

@@ -0,0 +1,64 @@
+/* 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 PINGHELPER_H
+#define PINGHELPER_H
+
+#include <QHostAddress>
+#include <QList>
+#include <QObject>
+#include <QTimer>
+#include <QVector>
+
+class PingSender;
+
+class PingHelper final : public QObject {
+ private:
+  Q_OBJECT
+  Q_DISABLE_COPY_MOVE(PingHelper)
+
+ public:
+  PingHelper();
+  ~PingHelper();
+
+  void start(const QString& serverIpv4Gateway,
+             const QString& deviceIpv4Address);
+
+  void stop();
+  uint latency() const;
+  uint stddev() const;
+  uint maximum() const;
+  double loss() const;
+
+ signals:
+  void pingSentAndReceived(qint64 msec);
+
+ private:
+  void nextPing();
+
+  void pingReceived(quint16 sequence);
+
+ private:
+  QHostAddress m_gateway;
+  QHostAddress m_source;
+  quint16 m_sequence = 0;
+
+  class PingSendData {
+   public:
+    PingSendData() {
+      timestamp = -1;
+      latency = -1;
+      sequence = 0;
+    }
+    qint64 timestamp;
+    qint64 latency;
+    quint16 sequence;
+  };
+  QVector<PingSendData> m_pingData;
+
+  QTimer m_pingTimer;
+  PingSender* m_pingSender = nullptr;
+};
+
+#endif  // PINGHELPER_H