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57 lines
1.3 KiB
57 lines
1.3 KiB
#!/usr/bin/env node
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'use strict';
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// pass a terminal arg
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var type = process.argv[2];
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var count = parseInt(process.argv[3]) || 0;
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if (!type) {
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console.error("Usage: mdns-capture.js <filename-prefix> [start-number]");
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console.error("Example: mdns-capture.js _service 0");
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console.error("Output: _service-0.mdns.bin");
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process.exit(1);
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}
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var PromiseA = require('bluebird');
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var fs = PromiseA.promisifyAll(require('fs'));
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var dgram = require('dgram');
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var server = dgram.createSocket({
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type: 'udp4'
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, reuseAddr: true
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});
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var handlers = {};
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handlers.onError = function (err) {
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console.error("error:", err.stack);
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server.close();
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};
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handlers.onMessage = function (buffer) {
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var path = require('path');
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var filename = type + '-' + count + '.mdns.bin';
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var fullpath = path.join('samples', filename);
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count += 1;
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fs.writeFileAsync(fullpath, buffer).then(function () {
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console.log('wrote ' + buffer.length + ' bytes to ' + fullpath);
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});
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};
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handlers.onListening = function () {
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/*jshint validthis:true*/
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var server = this;
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console.log(server.address());
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server.setBroadcast(true);
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server.addMembership('224.0.0.251');
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console.log('CTRL+C to quit');
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};
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server.on('error', handlers.onError);
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server.on('message', handlers.onMessage);
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server.on('listening', handlers.onListening);
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// 53 dns
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// 5353 mdns
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server.bind(5353);
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