Add dns server

server/private/dns.ts

@@ -0,0 +1,47 @@
+/*
+ * This file is part of a proprietary work.
+ *
+ * Copyright (c) 2025-2026 Fossorial, Inc.
+ * All rights reserved.
+ *
+ * This file is licensed under the Fossorial Commercial License.
+ * You may not use this file except in compliance with the License.
+ * Unauthorized use, copying, modification, or distribution is strictly prohibited.
+ *
+ * This file is not licensed under the AGPLv3.
+ */
+
+import { AuthoritativeDNSServer } from "#private/lib/dns";
+import { privateConfig } from "#private/lib/config";
+
+let dnsServer: AuthoritativeDNSServer | undefined;
+
+export async function startDnsServer() {
+    const dnsConfig = privateConfig.getRawPrivateConfig().dns;
+    if (!dnsConfig) {
+        return;
+    }
+
+    const cacheOptions = {
+        stdTTL: 300, // 5 minutes default TTL
+        checkperiod: 60, // Check for expired keys every 60 seconds
+        useClones: false // Better performance
+    };
+
+    // Create DNS server
+    dnsServer = new AuthoritativeDNSServer(
+        dnsConfig.listen_port,
+        cacheOptions
+    );
+
+    await dnsServer.start();
+}
+
+export async function stopDnsServer() {
+    if (!dnsServer) {
+        return;
+    }
+
+    await dnsServer.stop();
+    dnsServer = undefined;
+}