DNS server

packages/dns/package.json

@@ -0,0 +1,30 @@
+{
+  "name": "@tcpip/dns",
+  "version": "0.1.0",
+  "description": "DNS server built on tcpip.js",
+  "main": "dist/index.cjs",
+  "types": "dist/index.d.ts",
+  "type": "module",
+  "scripts": {
+    "build": "tsup --clean",
+    "test": "vitest",
+    "prepublishOnly": "npm run build"
+  },
+  "files": [
+    "dist/**/*"
+  ],
+  "exports": {
+    ".": {
+      "import": "./dist/index.js",
+      "types": "./dist/index.d.ts",
+      "default": "./dist/index.cjs"
+    }
+  },
+  "dependencies": {},
+  "devDependencies": {
+    "@total-typescript/tsconfig": "^1.0.4",
+    "tcpip": "0.2",
+    "typescript": "^5.0.4",
+    "vitest": "^3.0.1"
+  }
+}

packages/dns/src/constants.ts

@@ -0,0 +1,26 @@
+export const TypeCode = {
+  A: 1, // IPv4
+  NS: 2, // Nameserver
+  CNAME: 5, // Canonical name
+  SOA: 6, // Start of authority
+  PTR: 12, // Pointer
+  MX: 15, // Mail exchange
+  TXT: 16, // Text
+  AAAA: 28, // IPv6
+  SRV: 33, // Service locator
+  ANY: 255, // Any
+} as const;
+
+export const ClassCode = {
+  IN: 1, // Internet
+} as const;
+
+export const OpCode = {
+  QUERY: 0, // Standard query
+} as const;
+
+export const RCode = {
+  NOERROR: 0, // No error
+  SERVFAIL: 2, // Server failure
+  NXDOMAIN: 3, // Non-existent domain
+} as const;