feat: enable base Daemon to create and swap WireguardUtils without knowing platform type

client/daemon/daemon.h

@@ -69,6 +69,10 @@ class Daemon : public QObject {
   virtual bool supportServerSwitching(const InterfaceConfig& config) const;
   virtual bool switchServer(const InterfaceConfig& config);
   virtual WireguardUtils* wgutils() const = 0;
+  virtual WireguardUtils* createWgUtils() = 0;
+  virtual void replaceActiveWgUtils(WireguardUtils* newUtils) = 0;
+
+  WireguardUtils* m_stagingWgutils = nullptr;
   virtual bool supportIPUtils() const { return false; }
   virtual IPUtils* iputils() { return nullptr; }
   virtual DnsUtils* dnsutils() { return nullptr; }

client/platforms/linux/daemon/linuxdaemon.h

@@ -26,6 +26,15 @@ class LinuxDaemon final : public Daemon {
   bool supportIPUtils() const override { return true; }
   IPUtils* iputils() override { return m_iputils; }
 
+  WireguardUtils* createWgUtils() override {
+    return new WireguardUtilsLinux(this);
+  }
+
+  void replaceActiveWgUtils(WireguardUtils* newUtils) override {
+    delete m_wgutils;
+    m_wgutils = static_cast<WireguardUtilsLinux*>(newUtils);
+  }
+
  private:
   WireguardUtilsLinux* m_wgutils = nullptr;
   DnsUtilsLinux* m_dnsutils = nullptr;

client/platforms/macos/daemon/macosdaemon.h

@@ -25,6 +25,15 @@ class MacOSDaemon final : public Daemon {
   bool supportIPUtils() const override { return true; }
   IPUtils* iputils() override { return m_iputils; }
 
+  WireguardUtils* createWgUtils() override {
+    return new WireguardUtilsMacos(this);
+  }
+
+  void replaceActiveWgUtils(WireguardUtils* newUtils) override {
+    delete m_wgutils;
+    m_wgutils = static_cast<WireguardUtilsMacos*>(newUtils);
+  }
+
  private:
   WireguardUtilsMacos* m_wgutils = nullptr;
   DnsUtilsMacos* m_dnsutils = nullptr;

client/platforms/windows/daemon/windowsdaemon.cpp

@@ -112,3 +112,15 @@ void WindowsDaemon::monitorBackendFailure() {
   emit backendFailure();
   deactivate();
 }
+
+WireguardUtils* WindowsDaemon::createWgUtils() {
+  auto utils = WireguardUtilsWindows::create(m_firewallManager, this);
+  if (!utils) return nullptr;
+  connect(utils.get(), &WireguardUtilsWindows::backendFailure, this,
+          &WindowsDaemon::monitorBackendFailure);
+  return utils.release();
+}
+
+void WindowsDaemon::replaceActiveWgUtils(WireguardUtils* newUtils) {
+  m_wgutils.reset(static_cast<WireguardUtilsWindows*>(newUtils));
+}

client/platforms/windows/daemon/windowsdaemon.h

@@ -30,6 +30,8 @@ class WindowsDaemon final : public Daemon {
   bool run(Op op, const InterfaceConfig& config) override;
   WireguardUtils* wgutils() const override { return m_wgutils.get(); }
   DnsUtils* dnsutils() override { return m_dnsutils; }
+  WireguardUtils* createWgUtils() override;
+  void replaceActiveWgUtils(WireguardUtils* newUtils) override;
 
  private:
   void monitorBackendFailure();