test: add regression test for 14814

Ref: #14814

PR-URL: #15023
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>

Author: addaleax

test/parallel/test-dns-cancel-reverse-lookup.js

@@ -0,0 +1,29 @@
+'use strict';
+const common = require('../common');
+const dnstools = require('../common/dns');
+const { Resolver } = require('dns');
+const assert = require('assert');
+const dgram = require('dgram');
+
+const server = dgram.createSocket('udp4');
+const resolver = new Resolver();
+
+server.bind(0, common.mustCall(() => {
+  resolver.setServers([`127.0.0.1:${server.address().port}`]);
+  resolver.reverse('123.45.67.89', common.mustCall((err, res) => {
+    assert.strictEqual(err.code, 'ECANCELLED');
+    assert.strictEqual(err.errno, 'ECANCELLED');
+    assert.strictEqual(err.syscall, 'getHostByAddr');
+    assert.strictEqual(err.hostname, '123.45.67.89');
+    server.close();
+  }));
+}));
+
+server.on('message', common.mustCall((msg, { address, port }) => {
+  const parsed = dnstools.parseDNSPacket(msg);
+  const domain = parsed.questions[0].domain;
+  assert.strictEqual(domain, '89.67.45.123.in-addr.arpa');
+
+  // Do not send a reply.
+  resolver.cancel();
+}));