Shift Forwarder

A simple tool to shift all bytes and forward traffic

Why this?

I personally use this with an HTTP Proxy server to bypass censorship. Iran's DPI system is stupid enough to let the traffic get through. You can also use a SOCKS server behind the forwarder.

No shit guys, I almost went WTF when this worked.

Install

Use the executables from releases and download one for your server and client.

Server

./sf -server -to 127.0.0.1:8888 -interface 127.0.0.1 -port 1080

Run this command. It will get all traffics from port 1080, shift the bytes back and forwards them to 127.0.0.1:8888.

Client

 ./sf -to 1.1.1.1:1080 -port 8080

This will get all incoming traffics from port 8080 and forwards them to 1.1.1.1:1080.

Building

Just as easy as

go build main.go

Arguments

Usage of sf.exe:
  -bitwise
        Pass this argument to enable bitwise mode; Otherwise addition mode is used
  -interface string
        Binding address. Server's default is 0.0.0.0 and client's is localhost
  -port string
        If this is server, the port that proxy listens on it; It this is client, the port that accepts the data
  -server
        Pass this argument to run as server application
  -to string
        If this is server, the address that the data will be forwarded; If this is client, the server address
  -verbose
        More logs
  -version
        Show version

Bitwise Mode

Bitwise mode, bitwises all bytes before sending them to server or client. So server -> client and client -> server connections are bitwised.

If you enable bitwise mode on server, it must be enabled on server too.

How non bitwise mode works

When client forwards something to server, it adds 1 to all of the bytes. On server, the all the bytes will be subtracted by one. After the subtract, server will forward the traffic to the destination. The server->client traffic is also shifted like this.

Shadowsocks Plugin

You can also run this application as shadowsocks plugin. Here is an example of the server config:

{
    "server":"0.0.0.0",
    "server_port":2345,
    "password":"1234",
    "timeout":60,
    "method":"chacha20-ietf-poly1305",
    "nameserver":"1.1.1.1",
    "plugin":"/etc/shadowsocks-libev/sf",
    "plugin_opts":"server;bitwise"
}

plugin_opts supports 3 different values:

• server: When this key exists, application will run as server mode
• bitwise: When this key exists, application will use bitwise mode to obfuscate data. Otherwise addition is used.
• verbose: Show more logs

Keys must be separated with ;

Android application is coming soon