forked from LittleChest/dns-packet
0cf5761579
* Add TLS example and fix TCP buffer management. Allow all examples to run from examples directory. * Inspect response data decoding length, not request. Simplify package require().
53 lines
1.1 KiB
JavaScript
53 lines
1.1 KiB
JavaScript
'use strict'
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const packet = require('..')
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const net = require('net')
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var response = null
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var expected_length = 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 encodedPacket = packet.streamEncode({
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type: 'query',
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id: getRandomInt(1, 65534),
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flags: packet.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 client = new net.Socket()
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client.connect(53, '8.8.8.8', function () {
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console.log('Connected')
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client.write(encodedPacket)
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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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expected_length = 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 >= expected_length) {
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console.log(packet.streamDecode(response))
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client.destroy()
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}
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})
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client.on('close', function () {
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console.log('Connection closed')
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})
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