enqtran

constructor(props) {
        super(props);
        this.state = {
            height: window.innerHeight,
            message: 'not at bottom'
        };
        this.handleScroll = this.handleScroll.bind(this);
    }
    handleScroll() {
        const windowHeight = "innerHeight" in window ? window.innerHeight : document.documentElement.offsetHeight;

ammario

func ip2int(ip net.IP) uint32 {
	if len(ip) == 16 {
		return binary.BigEndian.Uint32(ip[12:16])
	}
	return binary.BigEndian.Uint32(ip)
}

func int2ip(nn uint32) net.IP {
	ip := make(net.IP, 4)
	binary.BigEndian.PutUint32(ip, nn)

klzgrad

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

danielrichman

import random
from flask import request, session, abort, Markup

@app.template_global('csrf_token')
def csrf_token():
    """
    Return the CSRF token for the current session

    If not already generated, session["_csrf_token"] is set to a random
    string. The token is used for the whole life of the session.

hellerbarde

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

log_test11.py

#!/usr/bin/env python
#
# Copyright 2001-2002 by Vinay Sajip. All Rights Reserved.
#
# Permission to use, copy, modify, and distribute this software and its
# documentation for any purpose and without fee is hereby granted,
# provided that the above copyright notice appear in all copies and that
# both that copyright notice and this permission notice appear in
# supporting documentation, and that the name of Vinay Sajip
# not be used in advertising or publicity pertaining to distribution

sbp

#!/bin/sh

export PYTHONPATH=$HOME/usr/opt/pyyaml/lib/python2.6/site-packages
python -c '
import sys, json, yaml
with open(sys.argv[1]) as f:
   print yaml.safe_dump(json.load(f), default_flow_style=False)
' $@

ryanmcgrath

// REFERENCE UNICODE TABLES: 
// http://www.rikai.com/library/kanjitables/kanji_codes.unicode.shtml
// http://www.tamasoft.co.jp/en/general-info/unicode.html
//
// TEST EDITOR:
// http://www.gethifi.com/tools/regex
//
// UNICODE RANGE : DESCRIPTION
// 
// 3000-303F : punctuation