1'use strict'; 2const common = require('../common'); 3const dnstools = require('../common/dns'); 4const dns = require('dns'); 5const assert = require('assert'); 6const dgram = require('dgram'); 7const dnsPromises = dns.promises; 8 9const server = dgram.createSocket('udp4'); 10const resolver = new dns.Resolver({ timeout: 100, tries: 1 }); 11const resolverPromises = new dnsPromises.Resolver({ timeout: 100, tries: 1 }); 12 13server.on('message', common.mustCall((msg, { address, port }) => { 14 const parsed = dnstools.parseDNSPacket(msg); 15 const domain = parsed.questions[0].domain; 16 assert.strictEqual(domain, 'example.org'); 17 18 const buf = dnstools.writeDNSPacket({ 19 id: parsed.id, 20 questions: parsed.questions, 21 answers: { type: 'A', address: '1.2.3.4', ttl: 123, domain }, 22 }); 23 // Overwrite the # of answers with 2, which is incorrect. The response is 24 // discarded in c-ares >= 1.21.0. This is the reason why a small timeout is 25 // used in the `Resolver` constructor. See 26 // https://github.com/nodejs/node/pull/50743#issue-1994909204 27 buf.writeUInt16LE(2, 6); 28 server.send(buf, port, address); 29}, 2)); 30 31server.bind(0, common.mustCall(async () => { 32 const address = server.address(); 33 resolver.setServers([`127.0.0.1:${address.port}`]); 34 resolverPromises.setServers([`127.0.0.1:${address.port}`]); 35 36 resolverPromises.resolveAny('example.org') 37 .then(common.mustNotCall()) 38 .catch(common.expectsError({ 39 // May return EBADRESP or ETIMEOUT 40 code: /^(?:EBADRESP|ETIMEOUT)$/, 41 syscall: 'queryAny', 42 hostname: 'example.org' 43 })); 44 45 resolver.resolveAny('example.org', common.mustCall((err) => { 46 assert.notStrictEqual(err.code, 'SUCCESS'); 47 assert.strictEqual(err.syscall, 'queryAny'); 48 assert.strictEqual(err.hostname, 'example.org'); 49 const descriptor = Object.getOwnPropertyDescriptor(err, 'message'); 50 // The error message should be non-enumerable. 51 assert.strictEqual(descriptor.enumerable, false); 52 server.close(); 53 })); 54})); 55