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/*
* 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|void} Human readable request type
*/
function type(code) {
for (let name in Packet.TYPE) {
if (Packet.TYPE[name] === code) {
return name;
}
}
}
|
