bryanchance

DHT Walkthrough Notes

I've put together these notes as I read about DHT's in depth and then learned how the libtorrent implementation based on the Kademlia paper actually works.

What problem does this solve?

400,000,000,000 (400 billion stars), that's a 4 followed by 11 zeros. The number of atoms in the universe is estimated to be around 10^82. A DHT with keys of 160 bits, can have 2^160 possible numbers, which is around 10^48

	=Navigating=
	visit('/projects')
	visit(post_comments_path(post))

	=Clicking links and buttons=
	click_link('id-of-link')
	click_link('Link Text')
	click_button('Save')
	click('Link Text') # Click either a link or a button
	click('Button Value')

	# Encoding file
	perl -MMIME::Base64 -0777 -ne 'print encode_base64($_)' < file

	# Decoding file
	perl -MMIME::Base64 -ne 'print decode_base64($_)' < file.b64

	# HMAC-SHA1
	perl -MDigest::HMAC_SHA1 -le '$_=Digest::HMAC_SHA1->new($ARGV[0])->add($ARGV[1])->b64digest; $_.="=" x length % 4; print' TestKey TestString

	<!DOCTYPE HTML>
	<html lang="en-US">
	<head>
	<meta charset="UTF-8">
	<title>test upload by chunk</title>
	</head>
	<body>
	<input type="file" id="f" />

	<script src="script.js"></script>

	#!/usr/bin/env python
	"""
	Requires apachelog. `pip install apachelog`
	"""
	from __future__ import with_statement
	import apachelog
	import csv
	import re
	import sys
	from optparse import OptionParser

	"""
	This python script encodes all files that have the extension mkv in the current
	working directory.

	Sources:
	http://ffmpeg.org/trac/ffmpeg/wiki/x264EncodingGuide
	"""
	import subprocess, os

	#-------------------------------------------------------------------------------

	-- ExportSQLite: SQLite export plugin for MySQL Workbench
	-- Copyright (C) 2009 Thomas Henlich
	--
	-- 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 3 of the License, or
	-- (at your option) any later version.
	--
	-- This program is distributed in the hope that it will be useful,
	-- but WITHOUT ANY WARRANTY; without even the implied warranty of

	#To create a classic TCP listening daemon, similar to netcat -l, use a variation of the following command.
	socat TCP-LISTEN:8080 stdout

	#use remotly a command shell
	socat TCP4-LISTEN:1234,reuseaddr,fork 'SYSTEM:/bin/cat /home/infos.txt'

	#sslify a server
	socat OPENSSL-LISTEN:443,reuse‐addr,pf=ip4,fork,cert=server.pem,cafile=client.crt TCP4-CONNECT:localhost:80

	client
	dev tun
	proto tcp
	remote 192.168.1.1 1194
	resolv-retry infinite
	nobind
	persist-key
	persist-tun
	ca [inline]
	cert [inline]