Awesome port joiner helper thingy, @myndzi contributed the structure and stuff

gistfile1.js

/**
 * The MIT License (MIT)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */

var net = require('net');

var server = net.createServer(function(helpee) {
    var link = new Link(helpee);
    
    link.listen(function() {
        console.log('Helpee is ready on port ' + link.server.address().port);
    });
}).listen(5000);

// helpee is a socket object
function Link(helpee) {
    this.helper = null;
    this.helpee = helpee;
    this.server = null;
    this.port = -1;
    
    this.helpee.pause();

    this.helpee.on('error', function(err) {
        console.error(err.stack);
        this.cleanup();
    }.bind(this));

    this.helpee.on('end', this.cleanup.bind(this));

    this.timer = setTimeout(this.cleanup.bind(this), 5*60*1000);
}

Link.prototype.connectHelper = function(helper) {
    clearTimeout(this.timer);
    this.helper = helper;
    this.helper.pipe(this.helpee).pipe(this.helper);
    this.helpee.resume();

    this.helper.on('error', function(err) {
        console.error(err.stack);
        this.cleanup();
    }.bind(this));

    this.helper.on('end', this.cleanup.bind(this));

    this.server.close();
};

Link.prototype.listen = function(callback) {
    this.server = net.createServer(this.connectHelper.bind(this)).listen(callback);

    this.server.on('error', function(err) {
        console.error(err.stack);
        this.cleanup();
    }.bind(this));
};

Link.prototype.cleanup = function() {
    if(this.helper !== null && this.helper.address()) this.helper.destroy();
    if(this.helpee !== null && this.helpee.address()) this.helpee.destroy();
    if(this.server !== null && this.server.address()) this.server.close();
};