1'use strict'; 2const common = require('../common'); 3const dnstools = require('../common/dns'); 4const { Resolver } = require('dns'); 5const assert = require('assert'); 6const dgram = require('dgram'); 7 8const server = dgram.createSocket('udp4'); 9const resolver = new Resolver(); 10 11server.bind(0, common.mustCall(() => { 12 resolver.setServers([`127.0.0.1:${server.address().port}`]); 13 resolver.reverse('123.45.67.89', common.mustCall((err, res) => { 14 assert.strictEqual(err.code, 'ECANCELLED'); 15 assert.strictEqual(err.syscall, 'getHostByAddr'); 16 assert.strictEqual(err.hostname, '123.45.67.89'); 17 server.close(); 18 })); 19})); 20 21server.on('message', common.mustCall((msg, { address, port }) => { 22 const parsed = dnstools.parseDNSPacket(msg); 23 const domain = parsed.questions[0].domain; 24 assert.strictEqual(domain, '89.67.45.123.in-addr.arpa'); 25 26 // Do not send a reply. 27 resolver.cancel(); 28})); 29