WireGuard rework for MacOS and Windows (#314)

WireGuard rework for MacOS and Windows

client/platforms/windows/daemon/dnsutilswindows.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 DNSUTILSWINDOWS_H
+#define DNSUTILSWINDOWS_H
+
+#include <windows.h>
+
+#include <QHostAddress>
+#include <QString>
+
+#include "daemon/dnsutils.h"
+
+class DnsUtilsWindows final : public DnsUtils {
+  Q_OBJECT
+  Q_DISABLE_COPY_MOVE(DnsUtilsWindows)
+
+ public:
+  explicit DnsUtilsWindows(QObject* parent);
+  virtual ~DnsUtilsWindows();
+  bool updateResolvers(const QString& ifname,
+                       const QList<QHostAddress>& resolvers) override;
+  bool restoreResolvers() override;
+
+ private:
+  quint64 m_luid = 0;
+  DWORD (*m_setInterfaceDnsSettingsProcAddr)(GUID, const void*) = nullptr;
+
+  bool updateResolversWin32(const QList<QHostAddress>& resolvers);
+  bool updateResolversNetsh(const QList<QHostAddress>& resolvers);
+};
+
+#endif  // DNSUTILSWINDOWS_H