Add dns server

server/dns.ts

@@ -0,0 +1,8 @@
+export async function startDnsServer() {
+    // No-op: the authoritative DNS server is only available in builds
+    // that include the private/enterprise feature set.
+}
+
+export async function stopDnsServer() {
+    // No-op counterpart to startDnsServer.
+}

server/index.ts

@@ -25,6 +25,7 @@ import { setHostMeta } from "@server/lib/hostMeta";
 import { TraefikConfigManager } from "@server/lib/traefik/TraefikConfigManager";
 import { initCleanup } from "#dynamic/cleanup";
 import { startSchedulers } from "#dynamic/startSchedulers";
+import { startDnsServer } from "#dynamic/dns";
 import license from "#dynamic/license/license";
 import { fetchServerIp } from "@server/lib/serverIpService";
 import { initAiModelCatalog } from "@server/lib/aiModelCatalog";
@@ -45,6 +46,8 @@ async function startServers() {
 
     startSchedulers();
 
+    await startDnsServer();
+
     // Start all servers
     const apiServer = createApiServer();
     const internalServer = createInternalServer();

server/private/cleanup.ts

@@ -20,6 +20,7 @@ import { flushSiteBandwidthToDb } from "@server/routers/gerbil/receiveBandwidth"
 import { stopPingAccumulator } from "@server/routers/newt/pingAccumulator";
 import { shutdownUsageRecorder } from "@server/lib/aiBudgetEnforcement";
 import { shutdownAiSessionLogger } from "@server/routers/aiGateway/logAiSession";
+import { stopDnsServer } from "./dns";
 
 async function cleanup() {
     await stopPingAccumulator();
@@ -31,6 +32,7 @@ async function cleanup() {
     await rateLimitService.cleanup();
     await wsCleanup();
     await logStreamingManager.shutdown();
+    await stopDnsServer();
 
     process.exit(0);
 }

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;
+}

server/private/lib/config.ts

@@ -152,6 +152,10 @@ export class PrivateConfig {
         return this.rawPrivateConfig;
     }
 
+    public getRawConfig() {
+        return this.getRawPrivateConfig();
+    }
+
     // `flags.enable_acme_cert_sync`, `flags.disable_private_http_placeholder`,
     // and `acme` used to live in the private config file. They now live in
     // the public config file. If an operator still has them set in the

server/private/lib/dns/index.ts

@@ -0,0 +1 @@
+export * from "./server";

server/private/lib/readConfigFile.ts

@@ -95,6 +95,69 @@ export const privateConfigSchema = z
                     .optional()
             })
             .optional(),
+        dns: z
+            .object({
+                listen_port: z.number(),
+                nameserver_name: z.string(),
+                cname_extension: z.string(),
+                site_extension: z.string(),
+                cname_alternate_extensions: z
+                    .array(z.string())
+                    .optional()
+                    .default([]),
+                alternate_nameservers: z
+                    .array(z.string())
+                    .optional()
+                    .default([]),
+                rate_limit: z
+                    .object({
+                        enabled: z.boolean().optional().default(true),
+                        window_ms: z
+                            .number()
+                            .int()
+                            .min(1000)
+                            .max(600000)
+                            .optional()
+                            .default(60000),
+                        max_requests: z
+                            .number()
+                            .int()
+                            .min(50)
+                            .max(100000)
+                            .optional()
+                            .default(1200),
+                        max_requests_per_query_type: z
+                            .number()
+                            .int()
+                            .min(10)
+                            .max(50000)
+                            .optional()
+                            .default(600)
+                    })
+                    .default({
+                        enabled: true,
+                        window_ms: 60000,
+                        max_requests: 1200,
+                        max_requests_per_query_type: 600
+                    }),
+                static_records: z
+                    .array(
+                        z.object({
+                            domain: z.string(),
+                            type: z.enum(["TXT", "CNAME", "A", "NS"]),
+                            value: z.string(),
+                            ttl: z
+                                .number()
+                                .int()
+                                .positive()
+                                .optional()
+                                .default(300)
+                        })
+                    )
+                    .optional()
+                    .default([])
+            })
+            .optional(),
         gerbil: z
             .object({
                 local_exit_node_reachable_at: z