60 lines
1.2 KiB
JavaScript
60 lines
1.2 KiB
JavaScript
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import * as dnsPacket from '@leichtgewicht/dns-packet'
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import tls from 'tls'
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let response = null
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let expectedLength = 0
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function getRandomInt (min, max) {
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return Math.floor(Math.random() * (max - min + 1)) + min
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}
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const buf = dnsPacket.streamEncode({
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type: 'query',
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id: getRandomInt(1, 65534),
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flags: dnsPacket.RECURSION_DESIRED,
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questions: [{
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type: 'A',
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name: 'google.com'
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}]
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})
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const context = tls.createSecureContext({
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secureProtocol: 'TLSv1_2_method'
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})
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const options = {
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port: 853,
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host: 'getdnsapi.net',
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secureContext: context
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}
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const client = tls.connect(options, () => {
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console.log('client connected')
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client.write(buf)
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})
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client.on('data', function (data) {
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console.log('Received response: %d bytes', data.byteLength)
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if (response == null) {
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if (data.byteLength > 1) {
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const plen = data.readUInt16BE(0)
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expectedLength = plen
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if (plen < 12) {
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throw new Error('below DNS minimum packet length')
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}
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response = Buffer.from(data)
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}
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} else {
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response = Buffer.concat([response, data])
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}
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if (response.byteLength >= expectedLength) {
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console.log(dnsPacket.streamDecode(response))
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client.destroy()
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}
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})
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client.on('end', () => {
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console.log('Connection ended')
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})
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