mdns-js

mDNS-js

Pure JavaScript/NodeJS mDNS discovery implementation.

A lot of the functionality is copied from https://github.com/GoogleChrome/chrome-app-samples/tree/master/mdns-browser but adapted for node.

Install by

npm install mdns-js

Future

It would be great to have a full implementation of mDSN + DNS-SD in pure JS but progress will be slow unless someone is willing to pitch in with pull requests, specifications for wanted functions etc. Also, as you should avoid to have multiple mDNS stacks on a system this might clash with stuff like avahi and bonjour.

example

var Mdns = require('mdns-js');

var browser = new mdns.createBrowser();

browser.on('ready', function () {
    mdns.discover(); 
});

browser.on('update', function (data) {
    console.log('data:', data);
});

Debugging

This library is using the debug module from TJ Holowaychuk and can be used like this.

DEBUG=mdns* node examples/simple.js

This will spit out a lot of information that might be useful.

License

Apache 2.0. See LICENSE file.

References

• https://github.com/GoogleChrome/chrome-app-samples/tree/master/mdns-browser
• http://en.wikipedia.org/wiki/Multicast_DNS
• http://en.wikipedia.org/wiki/Zero_configuration_networking#Service_discovery
• RFC 6762 - mDNS - http://tools.ietf.org/html/rfc6762
• RFC 6763 - DNS Based Service Discovery - http://tools.ietf.org/html/rfc6763
• http://www.tcpipguide.com/free/t_DNSMessageHeaderandQuestionSectionFormat.htm