Melvin MelvinTo

Source: https://web.archive.org/web/20141216073338/https://gkbrk.com/blog/read?name=reverse_engineering_the_speedtest_net_protocol Author: Gökberk Yaltıraklı

Reverse Engineering the Speedtest.net Protocol

After finishing my command line speed tester written in Rust, I didn't have a proper blog to document this process. A few days ago I wrapped up a simple blogging script in Python so hopefully it works good enough to explain how everything works.

By now I have already figured out the whole protocol for performing a speed test but I will write all the steps that I took so you can learn how to reverse engineer a simple protocol.

The code that I wrote can be found at https://github.com/gkbrk/speedtest-rust.

	---
	- name: Update dat files
	hosts: all
	become: yes

	vars:
	- base_path: /etc/mosdns
	- restart_daemon: yes
	- daemon_service_name: mosdns
	- clean_up_after: yes

	cd /home/pi
	mkdir -p /home/pi/stress_data
	truncate -s 1G DISK; mke2fs -q -t ext4 -F DISK
	sudo mount DISK /home/pi/stress_data
	sudo chmod 777 /home/pi/stress_data
	stressdisk -duration 5m -s 100000000 cycle /home/pi/stress_data
	awk '/Errors:/ {print $2}' /home/pi/stressdisk.log \| tail -1

	#!/bin/bash

	echo "Warning: This script is only tested on ubuntu 18.04 LTS"

	DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null && pwd )"

	# Require sudo privilege to setup and install packages

	echo "Turning on BBR..."
	sudo bash -c "modprobe tcp_bbr" &>/dev/null

	var readline = require('readline');
	var rl = readline.createInterface({
	input: process.stdin,
	output: process.stdout,
	terminal: false
	});

	let hash = {};

	rl.on('line', function(line){

	cat a.c
	/*
	* Linux watchdog demo for LPC313x
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,

	#!/bin/bash

	# This script is doing exactly the opposite of what shrink_image.sh is,
	# which will resize the filesystem to use maximum storage space of
	# the given device
	#
	# This is typically done after dd a shrinked image file to this given device
	#

	DEVICE_FILE=$1

	#!/bin/bash

	# This script will shrink a given image file to the minimal size to store existing data
	# Which is very helpful to reduce the disk space fot the image file
	#
	# Limitation
	# Only ext4 is supported
	# Only support single partition
	#
	# [email protected]

	package main

	import (
	"fmt"
	"strconv"
	"time"
	)

	type Node struct {
	prev, next *Node