WireGuard for MacOS (#248)

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

client/daemon/dnsutils.h

@@ -0,0 +1,34 @@
+/* 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 DNSUTILS_H
+#define DNSUTILS_H
+
+#include <QHostAddress>
+#include <QString>
+
+#include "dnsutils.h"
+
+class DnsUtils : public QObject {
+  Q_OBJECT
+
+ public:
+  explicit DnsUtils(QObject* parent) : QObject(parent){};
+  virtual ~DnsUtils() = default;
+
+  virtual bool updateResolvers(const QString& ifname,
+                               const QList<QHostAddress>& resolvers) {
+    Q_UNUSED(ifname);
+    Q_UNUSED(resolvers);
+    qFatal("Have you forgotten to implement DnsUtils::updateResolvers?");
+    return false;
+  };
+
+  virtual bool restoreResolvers() {
+    qFatal("Have you forgotten to implement DnsUtils::restoreResolvers?");
+    return false;
+  }
+};
+
+#endif  // DNSUTILS_H