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# Fourth
> Hey, now we are on level 4!
[![](https://img.shields.io/crates/v/fourth)](https://crates.io/crates/fourth) [![CI](https://img.shields.io/github/workflow/status/kernelerr/fourth/Rust)](https://github.com/KernelErr/fourth/actions/workflows/rust.yml)
**Under heavy development, version 0.1 may update frequently**
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](https://rustup.rs/).
```bash
$ 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:
```bash
$ cargo install fourth
```
Or you can download binary file form the Release page.
## Configuration
Fourth will read yaml format configuration file from `/etc/fourth/config.yaml`, and you can set custom path to environment variable `FOURTH_CONFIG`, here is an minimal viable example:
```yaml
version: 1
log: info
servers:
proxy_server:
listen:
- "127.0.0.1:8081"
default: remote
upstream:
remote: "tcp://www.remote.example.com:8082" # proxy to remote address
```
Built-in two upstreams: ban(terminate connection immediately), echo. For detailed configuration, check [this example](./example-config.yaml).
## Performance Benchmark
Tested on 4C2G server:
Use fourth to proxy to Nginx(QPS of direct connection: ~120000): ~70000 req/s (Command: `wrk -t200 -c1000 -d120s --latency http://proxy-server:8081`)
Use fourth to proxy to local iperf3: 8Gbps
## Thanks
- [tokio_kcp](https://github.com/Matrix-Zhang/tokio_kcp)
## License
Fourth is available under terms of Apache-2.0.

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# Fourth
> 这一波在第四层。
[![](https://img.shields.io/crates/v/fourth)](https://crates.io/crates/fourth) [![CI](https://img.shields.io/github/workflow/status/kernelerr/fourth/Rust)](https://github.com/KernelErr/fourth/actions/workflows/rust.yml)
[English](/README-EN.md)
**积极开发中0.1版本迭代可能较快**
Fourth是一个Rust实现的Layer 4代理用于监听指定端口TCP/KCP流量并根据规则转发到指定目标目前只支持TCP
## 功能
- 监听指定端口代理到本地或远端指定端口
- 监听指定端口通过TLS ClientHello消息中的SNI进行分流
- 支持KCP入站警告未测试
## 安装方法
为了确保获得您架构下的最佳性能,请考虑自行编译,首选需要确保您拥有[Rust工具链](https://rustup.rs/)。
```bash
$ cd fourth
$ cargo build --release
```
将在`target/release/fourth`生成二进制文件,您也可以使用`cargo install --path . `来安装二进制文件。
或者您也可以使用Cargo直接安装
```bash
$ cargo install fourth
```
或者您也可以直接从Release中下载二进制文件。
## 配置
Fourth使用yaml格式的配置文件默认情况下会读取`/etc/fourth/config.yaml`,您也可以设置自定义路径到环境变量`FOURTH_CONFIG`,如下是一个最小有效配置:
```yaml
version: 1
log: info
servers:
proxy_server:
listen:
- "127.0.0.1:8081"
default: remote
upstream:
remote: "tcp://www.remote.example.com:8082" # proxy to remote address
```
内置两个的upstreamban立即中断连接、echo返回读到的数据。更详细的配置可以参考[示例配置](./example-config.yaml)。
注意:[::]会默认同时绑定IPv4和IPv6。
## 性能测试
在4C2G的服务器上测试
使用Fourth代理到Nginx直连QPS 120000: ~70000req/s (测试命令:`wrk -t200 -c1000 -d120s --latency http://proxy-server:8081 `
使用Fourth代理到本地iperf38Gbps
## io_uring?
尽管经过了很多尝试我们发现目前一些Rust下面的io_uring实现存在问题我们使用的io_uring库实现尽管在吞吐量上可以做到单线程20Gbps相比之下Tokio仅有8Gbps但在QPS上存在性能损失较大的问题。因此在有成熟的io_uring实现之前我们仍然选择epoll。之后我们会持续关注相关进展。
可能以后会为Linux高内核版本的用户提供可选的io_uring加速。
## 感谢
- [tokio_kcp](https://github.com/Matrix-Zhang/tokio_kcp)
## 协议
Fourth以Apache-2.0协议开源。

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# Fourth # Fourth
> 这一波在第四层。 > Hey, now we are on level 4!
[![](https://img.shields.io/crates/v/fourth)](https://crates.io/crates/fourth) [![CI](https://img.shields.io/github/workflow/status/kernelerr/fourth/Rust)](https://github.com/KernelErr/fourth/actions/workflows/rust.yml) [![](https://img.shields.io/crates/v/fourth)](https://crates.io/crates/fourth) [![CI](https://img.shields.io/github/workflow/status/kernelerr/fourth/Rust)](https://github.com/KernelErr/fourth/actions/workflows/rust.yml)
[English](/README-EN.md) **Under heavy development, version 0.1 may update frequently**
**积极开发中0.1版本迭代可能较快** 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.
Fourth是一个Rust实现的Layer 4代理用于监听指定端口TCP/KCP流量并根据规则转发到指定目标目前只支持TCP ## Features
## 功能 - Listen on specific port and proxy to local or remote port
- SNI-based rule without terminating TLS connection
- Allow KCP inbound(warning: untested)
- 监听指定端口代理到本地或远端指定端口 ## Installation
- 监听指定端口通过TLS ClientHello消息中的SNI进行分流
- 支持KCP入站警告未测试
## 安装方法 To gain best performance on your computer's architecture, please consider build the source code. First, you may need [Rust tool chain](https://rustup.rs/).
为了确保获得您架构下的最佳性能,请考虑自行编译,首选需要确保您拥有[Rust工具链](https://rustup.rs/)。
```bash ```bash
$ cd fourth $ cd fourth
$ cargo build --release $ cargo build --release
``` ```
将在`target/release/fourth`生成二进制文件,您也可以使用`cargo install --path . `来安装二进制文件。 Binary file will be generated at `target/release/fourth`, or you can use `cargo install --path .` to install.
或者您也可以使用Cargo直接安装 Or you can use Cargo to install Fourth:
```bash ```bash
$ cargo install fourth $ cargo install fourth
``` ```
或者您也可以直接从Release中下载二进制文件。 Or you can download binary file form the Release page.
## 配置 ## Configuration
Fourth使用yaml格式的配置文件默认情况下会读取`/etc/fourth/config.yaml`,您也可以设置自定义路径到环境变量`FOURTH_CONFIG`,如下是一个最小有效配置: Fourth will read yaml format configuration file from `/etc/fourth/config.yaml`, and you can set custom path to environment variable `FOURTH_CONFIG`, here is an minimal viable example:
```yaml ```yaml
version: 1 version: 1
@ -53,28 +51,20 @@ upstream:
remote: "tcp://www.remote.example.com:8082" # proxy to remote address remote: "tcp://www.remote.example.com:8082" # proxy to remote address
``` ```
内置两个的upstreamban立即中断连接、echo返回读到的数据。更详细的配置可以参考[示例配置](./example-config.yaml)。 Built-in two upstreams: ban(terminate connection immediately), echo. For detailed configuration, check [this example](./example-config.yaml).
注意:[::]会默认同时绑定IPv4和IPv6。 ## Performance Benchmark
## 性能测试 Tested on 4C2G server:
在4C2G的服务器上测试 Use fourth to proxy to Nginx(QPS of direct connection: ~120000): ~70000 req/s (Command: `wrk -t200 -c1000 -d120s --latency http://proxy-server:8081`)
使用Fourth代理到Nginx直连QPS 120000: ~70000req/s (测试命令:`wrk -t200 -c1000 -d120s --latency http://proxy-server:8081 ` Use fourth to proxy to local iperf3: 8Gbps
使用Fourth代理到本地iperf38Gbps ## Thanks
## io_uring?
尽管经过了很多尝试我们发现目前一些Rust下面的io_uring实现存在问题我们使用的io_uring库实现尽管在吞吐量上可以做到单线程20Gbps相比之下Tokio仅有8Gbps但在QPS上存在性能损失较大的问题。因此在有成熟的io_uring实现之前我们仍然选择epoll。之后我们会持续关注相关进展。
可能以后会为Linux高内核版本的用户提供可选的io_uring加速。
## 感谢
- [tokio_kcp](https://github.com/Matrix-Zhang/tokio_kcp) - [tokio_kcp](https://github.com/Matrix-Zhang/tokio_kcp)
## 协议 ## License
Fourth以Apache-2.0协议开源。 Fourth is available under terms of Apache-2.0.