Zhenkai Jiang jzk

朴素VPN：一个纯内核级静态隧道

由于路由管控系统的建立，实时动态黑洞路由已成为最有效的封锁手段，TCP连接重置和DNS污染成为次要手段，利用漏洞的穿墙方法已不再具有普遍意义。对此应对方法是多样化协议的VPN来抵抗识别。这里介绍一种太简单、有时很朴素的“穷人VPN”。

朴素VPN只需要一次内核配置（Linux内核），即可永久稳定运行，不需要任何用户态守护进程。所有流量转换和加密全部由内核完成，原生性能，开销几乎没有。静态配置，避免动态握手和参数协商产生指纹特征导致被识别。并且支持NAT，移动的内网用户可以使用此方法。支持广泛，基于L2TPv3标准，Linux内核3.2+都有支持，其他操作系统原则上也能支持。但有两个局限：需要root权限；一个隧道只支持一个用户。

朴素VPN利用UDP封装的静态L2TP隧道实现VPN，内核XFRM实现静态IPsec。实际上IP-in-IP隧道即可实现VPN，但是这种协议无法穿越NAT，因此必须利用UDP封装。内核3.18将支持Foo-over-UDP，在UDP里面直接封装IP，与静态的L2TP-over-UDP很类似。

创建一个朴素VPN

Intro

Setup GitHub Pages "gh-pages" branch as a subfolder within the "master" project on your local checkout.

IMPORTANT

If you plan on switching between different branches (e.g. git checkout master-experiment then revert back with git checkout master) you will loose your child folder from this tutorial (because it's in your .gitignore and is not part of your master branch).

	"""
	Example snippet on how to sync from JIRA to omnifocus.

	The main function is OmniFocus.sync_jira_to_omnifocus().
	OmniFocus.process_jira_data() is customized to filter projects based on my own needs and will need updating.
	"""
	from applescript import AppleScript, ScriptError
	from datetime import datetime
	from json import JSONDecoder
	from logging import getLogger

	tell application "Calendar"
	-- delete everything from the destination calendar
	-- TODO: Change "Destination Calendar" to be the name of your destination calendar
	repeat with anEvent in (get events of calendar "Destination Calendar")
	delete anEvent
	end repeat

	-- copy all events from the source calendar to the destination
	-- TODO: Change "Source Calendar" to be the name of your source calendar
	-- TODO: Change "Destination Calendar" to be the name of your destination calendar

	#!/usr/bin/tclsh8.5
	#
	# Usage: git-unmerged branch1 branch2
	#
	# Shows all the non-common commits in the two branches, where non-common
	# commits means simply commits with a unique commit message.

	proc getlog branch {
	lrange [split [exec git log $branch --oneline] "\n"] 0 400
	}

	#!/bin/sh
	# Author: RA <ravageralpha@gmail.com>

	USAGE(){
	echo "Usage:$(basename $0) [eng] files..."
	}

	[ $# -eq 0 ] && USAGE && exit 0

	ERROR(){

	#
	# Install:
	# install https://github.com/github/gollum
	# in /srv/wiki do a git init
	# add this script to /etc/init/gollum.conf
	#
	# Usage:
	# start/stop/restart gollum
	#

	#!/usr/bin/env python
	# Reflects the requests from HTTP methods GET, POST, PUT, and DELETE
	# Written by Nathan Hamiel (2010)

	from BaseHTTPServer import HTTPServer, BaseHTTPRequestHandler
	from optparse import OptionParser

	class RequestHandler(BaseHTTPRequestHandler):

	def do_GET(self):