dns-suite.js/mdns-udp-capturer.js

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'use strict';
// pass a terminal arg
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var type = process.argv[2];
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var count = parseInt(process.argv[3]) || 0;
if (!type) {
console.error("Usage: node aj-listener.js <type> [count]");
console.error("Example: node aj-listener.js _service 0");
process.exit(1);
}
var PromiseA = require('bluebird');
var fs = PromiseA.promisifyAll(require('fs'));
var dgram = require('dgram');
var server = dgram.createSocket({
type: 'udp4'
, reuseAddr: true
});
var handlers = {};
handlers.onError = function (err) {
console.error("error:", err.stack);
server.close();
};
handlers.onMessage = function (buffer) {
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var name = type + '-' + count + '.mdns.bin';
count += 1;
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fs.writeFileAsync(name, buffer).then(function () {
console.log('wrote ' + buffer.length + ' bytes to ' + name);
});
};
handlers.onListening = function () {
/*jshint validthis:true*/
var server = this;
console.log(server.address());
server.setBroadcast(true);
server.addMembership('224.0.0.251');
};
server.on('error', handlers.onError);
server.on('message', handlers.onMessage);
server.on('listening', handlers.onListening);
// 53 dns
// 5353 mdns
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server.bind(5353);