A STUN client and server NPM package

Overview

STUN (Simple Traversal of UDP through NAT: RFC3489) is a protocol that allows a client node to obtain an external IP address and port number assigned by a NAT the client is behind. It can also identify behavioral type of the NAT. It is implemented in JavaScript to run with node.js.

(This implementation is a packaged version of https://github.com/enobufs/stun so all thanks go to him/her)

System requirement

• Node.js v0.4 or above
• Two IP addresses on the same machine (for server)

How to install STUN server

$ npm install -g stunsrv

You may need to create a symlink to node

#!bash
$ sudo ln -s /usr/bin/nodejs /usr/bin/node

How to run STUN server

(1) execute stunsrv from the command line or (2) create and handle a stun server through the class from a js file

-- defaults are provided for all parameters (you'll probably need to use the first two though to do anything useful)

#!bash
# From terminal
$ stunsrv
$ stunsrv firstIP secondIP firstPort secondPort externalIP0 externalIP1

# Or programmatically
var stun = require('stunsrv');
var server = stun.createServer();
server.setAddress0("bindAddress0");
server.setAddress1("bindAddress1");
server.setPort0(port0);
server.setPort1(port1);
server.setResponseAddress0("externalIP0");
server.setResponseAddress1("externalIP1");
server.listen();

How to run STUN client

var stun = require('stunsrv');

//var STUN_SERVER_ADDR = "dntg-stun.usrd.scea.com";
//var STUN_SERVER_ADDR = "stun1.noc.ams-ix.net";
var STUN_SERVER_ADDR = "172.16.4.6";

var client = stun.createClient();
client.setServerAddr(STUN_SERVER_ADDR);
client.start(function(result)
{
    var mapped = client.getMappedAddr();
    // Dump client properties
    console.log("Complete(" + result + "): " + (client.isNatted()?"Natted":"Open") + " NB=" + client.getNB() + " EF=" + client.getEF() + " (" + client.getNatType() + ") mapped=" + mapped.address + ":" + mapped.port + " rtt=" + client.getRtt());
    client.close(function()
    {
        console.log("All sockets closed.");
    });
});

That is it!

Limitations

• Current implementation does not support RFC 5389
• Following attributes are not supported
  • RESPONSE-ADDRESS
  • CHANGED-ADDRESS
  • USERNAME
  • PASSWORD
  • MESSAGE-INTEGRITY
  • ERROR-CODE
  • UNKNOWN-ATTRIBUTE
  • REFLECTED-FROM
  • XOR-MAPPED-ADDRESS (RFC3489bis)

License

MIT Licensed

CONTRIBUTORS WANTED!!

Please contact me.