Add allowed DNS list for killswitch

client/daemon/interfaceconfig.h

@@ -37,6 +37,7 @@ class InterfaceConfig {
   QList<IPAddress> m_allowedIPAddressRanges;
   QStringList m_excludedAddresses;
   QStringList m_vpnDisabledApps;
+  QStringList m_allowedDnsServers;
   bool m_killSwitchEnabled;
 #if defined(MZ_ANDROID) || defined(MZ_IOS)
   QString m_installationId;

client/platforms/windows/daemon/windowsfirewall.cpp

@@ -236,6 +236,14 @@ bool WindowsFirewall::enablePeerTraffic(const InterfaceConfig& config) {
     }
   }
 
+  for (const QString& dns : config.m_allowedDnsServers) {
+    logger.debug() << "Allow DNS: " << dns;
+    if (!allowTrafficTo(QHostAddress(dns), 53, HIGH_WEIGHT,
+                        "Allow DNS-Server", config.m_serverPublicKey)) {
+      return false;
+    }
+  }
+
   if (!config.m_excludedAddresses.empty()) {
     for (const QString& i : config.m_excludedAddresses) {
       logger.debug() << "range: " << i;

client/protocols/protocols_defs.h

@@ -95,6 +95,8 @@ namespace amnezia
         constexpr char splitTunnelApps[] = "splitTunnelApps";
         constexpr char appSplitTunnelType[] = "appSplitTunnelType";
 
+        constexpr char allowedDnsServers[] = "allowedDnsServers";
+
         constexpr char killSwitchOption[] = "killSwitchOption";
 
         constexpr char crc[] = "crc";