Fourth

Hey, now we are on level 4!

Fourth is a layer 4 proxy implemented by Rust to listen on specific ports and transfer TCP/KCP data to remote addresses(only TCP) according to configuration.

Features

Listen on specific port and proxy to local or remote port
SNI-based rule without terminating TLS connection
Allow KCP inbound(warning: untested)

Installation

To gain best performance on your computer's architecture, please consider build the source code. First, you may need Rust tool chain.

$ cd fourth
$ cargo build --release

Binary file will be generated at target/release/fourth, or you can use cargo install --path . to install.

Or you can use Cargo to install Fourth:

$ cargo install fourth

Configuration

Fourth will read yaml format configuration file from /etc/fourth/config.yaml, here is an example:

version: 1
log: info

servers:
  example_server:
    listen:
      - "0.0.0.0:443"
      - "[::]:443"
    tls: true # Enable TLS features like SNI
    sni:
      proxy.example.com: proxy
      www.example.com: nginx
    default: ban
  relay_server:
    listen:
      - "127.0.0.1:8081"
    default: remote

upstream:
  nginx: "127.0.0.1:8080"
  proxy: "127.0.0.1:1024"
  remote: "www.remote.example.com:8082" # proxy to remote address

Built-in two upstreams: ban(terminate connection immediately), echo

Thanks

tokio_kcp

License

Fourth is available under terms of Apache-2.0.

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