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simple-shadow

中文介绍 100 行 js 代码写一个类似 shadowsocks 的科学上网工具

Usage

# install
npm install -g viti

# start remote server
viti --remote --password 'sample password'

# start local server and connect with remote
viti --local --host '12.12.12.33' --password 'sample password'

Note

  1. local server will be listening on 127.0.0.1:1081; Then, you need to set up socks proxy for your computer
  2. remote server will be listening on port 1082; make sure this port is opened.
  3. password of remote and local server should be the same

How simple-shadow works

The principle is simple:

用于墙的存在，本地计算机无法访问 google.com。 但是本地机器可以访问一个在墙外的机器（该机器可以访问 google.com）。 很容易想到，你可以通过墙外的那台机器代替你去访问 google，然后把反馈发送给你。

Detailed procedure is

  1. browser want to visit google.com; the request is sent in SOCKS5 protocal to local tcp proxy
  2. local tcp proxy encrypt the data and send to remote tcp proxy(pass the wall)
  3. remote tcp proxy decrypt the data and send to SOCKS5 server
  4. SOCKS5 server do the request to google.com and send the response back to remote tcp proxy
  5. remote tcp proxy encrypt the data and send to local tcp proxy(pass the wall)
  6. local tcp proxy decrypt the data and send back to brower, now you can access google.com!

Concepts to grasp

  • SOCKS5: 一种网络传输协议，主要用于客户端与外网服务器之间通讯的中间传递。我们使用 SOCKS5 在服务端代表浏览器请求相应网站
  • AES (Advanced Encryption Standard): AES 是一种 对称密钥加密算法 (加密解密用的同一个密钥). 我们使用 AES 来加密解密来往于本地和远程服务器之间的数据