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'use strict';
const common = require('../common');
const dnstools = require('../common/dns');
const { Resolver } = require('dns');
const assert = require('assert');
const dgram = require('dgram');
const servers = [
{
socket: dgram.createSocket('udp4'),
reply: { type: 'A', address: '1.2.3.4', ttl: 123, domain: 'example.org' }
},
{
socket: dgram.createSocket('udp4'),
reply: { type: 'A', address: '5.6.7.8', ttl: 123, domain: 'example.org' }
}
];
let waiting = servers.length;
for (const { socket, reply } of servers) {
socket.on('message', common.mustCall((msg, { address, port }) => {
const parsed = dnstools.parseDNSPacket(msg);
const domain = parsed.questions[0].domain;
assert.strictEqual(domain, 'example.org');
socket.send(dnstools.writeDNSPacket({
id: parsed.id,
questions: parsed.questions,
answers: [reply],
}), port, address);
}));
socket.bind(0, common.mustCall(() => {
if (0 === --waiting) ready();
}));
}
function ready() {
const resolvers = servers.map((server) => ({
server,
resolver: new Resolver()
}));
for (const { server: { socket, reply }, resolver } of resolvers) {
resolver.setServers([`127.0.0.1:${socket.address().port}`]);
resolver.resolve4('example.org', common.mustCall((err, res) => {
assert.ifError(err);
assert.deepStrictEqual(res, [reply.address]);
socket.close();
}));
}
}
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