/* * Simple DNS Server * For testing DNS monitoring type, dev only */ const dns2 = require("dns2"); const { Packet } = dns2; const server = dns2.createServer({ udp: true }); server.on("request", (request, send, rinfo) => { for (let question of request.questions) { console.log(question.name, type(question.type), question.class); const response = Packet.createResponseFromRequest(request); if (question.name === "existing.com") { if (question.type === Packet.TYPE.A) { response.answers.push({ name: question.name, type: question.type, class: question.class, ttl: 300, address: "1.2.3.4" }); } else if (question.type === Packet.TYPE.AAAA) { response.answers.push({ name: question.name, type: question.type, class: question.class, ttl: 300, address: "fe80::::1234:5678:abcd:ef00", }); } else if (question.type === Packet.TYPE.CNAME) { response.answers.push({ name: question.name, type: question.type, class: question.class, ttl: 300, domain: "cname1.existing.com", }); } else if (question.type === Packet.TYPE.MX) { response.answers.push({ name: question.name, type: question.type, class: question.class, ttl: 300, exchange: "mx1.existing.com", priority: 5 }); } else if (question.type === Packet.TYPE.NS) { response.answers.push({ name: question.name, type: question.type, class: question.class, ttl: 300, ns: "ns1.existing.com", }); } else if (question.type === Packet.TYPE.SOA) { response.answers.push({ name: question.name, type: question.type, class: question.class, ttl: 300, primary: "existing.com", admin: "admin@existing.com", serial: 2021082701, refresh: 300, retry: 3, expiration: 10, minimum: 10, }); } else if (question.type === Packet.TYPE.SRV) { response.answers.push({ name: question.name, type: question.type, class: question.class, ttl: 300, priority: 5, weight: 5, port: 8080, target: "srv1.existing.com", }); } else if (question.type === Packet.TYPE.TXT) { response.answers.push({ name: question.name, type: question.type, class: question.class, ttl: 300, data: "#v=spf1 include:_spf.existing.com ~all", }); } else if (question.type === Packet.TYPE.CAA) { response.answers.push({ name: question.name, type: question.type, class: question.class, ttl: 300, flags: 0, tag: "issue", value: "ca.existing.com", }); } } if (question.name === "4.3.2.1.in-addr.arpa") { if (question.type === Packet.TYPE.PTR) { response.answers.push({ name: question.name, type: question.type, class: question.class, ttl: 300, domain: "ptr1.existing.com", }); } } send(response); } }); server.on("listening", () => { console.log("Listening"); console.log(server.addresses()); }); server.on("close", () => { console.log("server closed"); }); server.listen({ udp: 5300 }); /** * Get human readable request type from request code * @param {number} code Request code to translate * @returns {string} Human readable request type */ function type(code) { for (let name in Packet.TYPE) { if (Packet.TYPE[name] === code) { return name; } } }