Fight renegade socket.io connections that try to kill your server

killsockets.js

/* 
Very simple solution for fighting renegade connections that try to overflood your socket.io server and kill your nodejs.
This limits number of connections and sends disconnect to the rest.
You can expend it by saving IP list in memory and handle uniqueness per IP also if you wish.
*/

//Start count
var connections = 0;
var maxconnections = 1000;

io.sockets.on('connection', function (socket) {
    //Add up connections
	connections = connections+1;
    //If we reached the limit, send disconnect to all clients.
	if(connections > maxconnections) {
		socket.disconnect();
	}
	// when the user disconnects.. perform this
	socket.on('disconnect', function(){

        //If client disconnects send disconnect.
		socket.disconnect();

	});
});
//Monitor your connected clients and see how it hardlimits everything.
app.get('/connected',function(req,res) {

	res.jsonp(io.sockets.sockets.length);

})