47 lines
2.3 KiB
JavaScript
47 lines
2.3 KiB
JavaScript
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"use strict";
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var dnsPacket = _interopRequireWildcard(require("@leichtgewicht/dns-packet"), true);
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var _net = require("net");
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function _getRequireWildcardCache(nodeInterop) { if (typeof WeakMap !== "function") return null; var cacheBabelInterop = new WeakMap(); var cacheNodeInterop = new WeakMap(); return (_getRequireWildcardCache = function (nodeInterop) { return nodeInterop ? cacheNodeInterop : cacheBabelInterop; })(nodeInterop); }
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function _interopRequireWildcard(obj, nodeInterop) { if (!nodeInterop && obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(nodeInterop); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (key !== "default" && Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
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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 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(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('close', function () {
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console.log('Connection closed');
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});
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