65 lines
1.6 KiB
JavaScript
65 lines
1.6 KiB
JavaScript
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/*eslint no-console:0*/
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var dns = require('..');
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var dgram = require('dgram');
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var DNSSERVER = '8.8.8.8';
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resolveName('140.211.167.51');
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function resolveName(address) {
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var packet = new dns.DNSPacket();
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packet.header.rd = 1; //make query recursive
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packet.header.id = 4242;
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var qname = address.split('.').reverse().join('.') + '.in-addr.arpa.';
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console.log('qname', qname);
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packet.question.push(new dns.DNSRecord(
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qname,
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dns.DNSRecord.Type.PTR, 1)
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);
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var s = dgram.createSocket('udp4');
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s.bind();
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s.on('listening', function () {
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var buf = dns.DNSPacket.toBuffer(packet);
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s.send(buf, 0, buf.length, 53, DNSSERVER, function (err, bytes) {
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if (err) {
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return console.error('error sending', err);
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}
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console.log('sent request of %d bytes', bytes);
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});
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});
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s.on('message', function (data) {
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console.log('incoming response');
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var response = dns.DNSPacket.parse(data);
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if (response.header.rcode === 0) {
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response.answer.forEach(function (a) {
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console.log('answer type:%s, class:%s, name:%s, data: %s',
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a.typeName, a.className, a.name, a.data);
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console.log('IP %s have resolved to name %s', address, a.data);
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});
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}
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else {
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console.log('Server responded with error');
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if (response.header.rcode === dns.DNSPacket.RCODE.NXDomain) {
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console.log('No such name');
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}
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else {
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console.log('rcode', response.header.rcode);
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}
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}
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s.close();
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});
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s.on('end', function () {
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console.log('connection closed');
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});
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s.on('error', function (err) {
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console.error('error', err);
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});
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}
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