├── .github └── workflows │ └── nightly.yaml ├── Cargo.lock ├── Cargo.toml ├── LICENSE ├── Makefile ├── README.md ├── config ├── client.toml ├── forward.toml └── server.toml └── src ├── error └── mod.rs ├── main.rs ├── protocol ├── direct │ ├── connector.rs │ └── mod.rs ├── dokodemo │ ├── acceptor.rs │ └── mod.rs ├── mod.rs ├── mux │ ├── acceptor.rs │ ├── connector.rs │ └── mod.rs ├── plaintext │ ├── acceptor.rs │ └── mod.rs ├── socks5 │ ├── acceptor.rs │ └── mod.rs ├── tls │ ├── acceptor.rs │ ├── connector.rs │ └── mod.rs ├── trojan │ ├── acceptor.rs │ ├── connector.rs │ └── mod.rs └── websocket │ ├── acceptor.rs │ ├── connector.rs │ └── mod.rs └── proxy └── mod.rs /.github/workflows/nightly.yaml: -------------------------------------------------------------------------------- 1 | on: [push] 2 | 3 | name: nightly 4 | 5 | jobs: 6 | build-windows: 7 | runs-on: windows-latest 8 | steps: 9 | - uses: actions/checkout@v2 10 | - uses: actions-rs/toolchain@v1 11 | with: 12 | toolchain: stable 13 | - uses: actions-rs/cargo@v1 14 | with: 15 | command: build 16 | args: --release 17 | - uses: actions/upload-artifact@v2 18 | with: 19 | name: build-windows 20 | path: target\release\trojan-r 21 | 22 | build-linux: 23 | strategy: 24 | matrix: 25 | target: [x86_64-unknown-linux-musl, armv7-unknown-linux-musleabihf, arm-unknown-linux-musleabihf, aarch64-unknown-linux-musl] 26 | runs-on: ubuntu-latest 27 | steps: 28 | - uses: actions/checkout@v2 29 | - uses: actions-rs/toolchain@v1 30 | with: 31 | toolchain: stable 32 | target: ${{ matrix.target }} 33 | override: true 34 | - uses: actions-rs/cargo@v1 35 | with: 36 | use-cross: true 37 | command: build 38 | args: --release --target ${{ matrix.target }} 39 | - uses: actions/upload-artifact@v2 40 | with: 41 | name: build-${{ matrix.target }} 42 | path: target/${{ matrix.target }}/release/trojan-r 43 | -------------------------------------------------------------------------------- /Cargo.lock: 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"rt-multi-thread", "sync", "macros"]} 10 | tokio-rustls = "0.22" 11 | log = "0.4" 12 | async-trait = "0.1" 13 | sha2 = "0.9" 14 | serde = { version = "1.0", features = ["derive"] } 15 | env_logger = "0.8" 16 | toml = "0.5" 17 | clap = "2.33" 18 | webpki = "0.21" 19 | webpki-roots = "0.21" 20 | tokio-tungstenite = "0.14" 21 | futures-core = "0.3" 22 | futures-util = "0.3" 23 | 24 | [profile.release] 25 | lto = true 26 | 27 | [features] 28 | default = ["full"] 29 | client = [] 30 | server = [] 31 | forward = [] 32 | full = ["client", "server", "forward"] -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | 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But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /Makefile: -------------------------------------------------------------------------------- 1 | default: 2 | cargo build --release 3 | 4 | x86_64-unknown-linux-musl: 5 | cargo build --target $@ --release 6 | 7 | armv7-unknown-linux-musleabihf: 8 | cross build --target $@ --release 9 | 10 | arm-unknown-linux-musleabihf: 11 | cross build --target $@ --release 12 | 13 | aarch64-unknown-linux-musl: 14 | cross build --target $@ --release 15 | 16 | aarch64-linux-android: 17 | cross build --target $@ --release 18 | 19 | armv7-linux-androideabi: 20 | cross build --target $@ --release 21 | 22 | i686-linux-android: 23 | cross build --target $@ --release 24 | 25 | x86_64-linux-android: 26 | cross build --target $@ --release -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Trojan-R 2 | 3 | 高性能的 Trojan 代理，使用 Rust 实现。为嵌入式设备或低性能机器设计。R 意为 **R**ust / **R**apid。 4 | 5 | **Trojan-R 目前为实验性项目，仍处于重度开发中，协议、接口和配置文件格式均可能改变，请勿用于任何生产环境。** 6 | 7 | ## 特性 8 | 9 | - 极致性能 10 | 11 | 牺牲部分灵活性，采用激进的性能优化策略以极力减少不必要的开销。采用[更高效](https://jbp.io/2019/07/01/rustls-vs-openssl-performance.html)的 `rustls` （相较 openssl）建立 TLS 隧道以提升加解密的性能表现。 12 | 13 | 使用 tokio 异步运行时，允许 `Trojan-R` 同时使用所有 CPU 核心，保证低时延和高效的吞吐能力。 14 | 15 | > 需要更多 benchmark 数据和更多优化 16 | 17 | - 低内存占用 18 | 19 | Rust 无 GC 机制，内存占用可被预计。简化的握手和连接流程，仅使用极少的堆内存和复制。 20 | 21 | > 需要更多 benchmark 数据和更多优化 22 | 23 | - 简易配置 24 | 25 | 使用 toml 格式配置，仅需数行配置即可启动完整客户端或服务器。 26 | 27 | - 内存安全 28 | 29 | 使用 Rust 语言实现，可证明的内存安全性。在语法层面保证所有内存操作安全可靠。无竞争条件，无悬挂指针，无 UAF，无 Double Free。 30 | 31 | - 密码学安全 32 | 33 | 使用 `rustls` 建立 TLS 加密安全信道，过时的或不安全的密码学套件[均被禁用](https://docs.rs/rustls/0.18.1/rustls/#non-features)。`Trojan-R` 强制开启服务器证书校验以防止中间人攻击。 34 | 35 | - 隐蔽传输 36 | 37 | `Trojan-R` 使用 TLS 建立代理隧道，难以从正常 TLS 流量中被区分。支持协议回落，在遭到主动探测时将与普通 TLS 服务器表现一致。 38 | 39 | - 跨平台支持 40 | 41 | `Trojan-R` 可被交叉编译，支持 Android， Linux，Windows 和 MacOS 等操作系统，以及 x86，x86_64，armv7，aarch64 等硬件平台。 42 | 43 | ## 非特性 44 | 45 | 由于与项目的设计原则冲突，下列特性不计划实现 46 | 47 | - 统计功能，包括 API 和数据库对接等 48 | 49 | - 路由功能 50 | 51 | - 用户自定义协议栈 52 | 53 | - 透明代理 54 | 55 | 如果需要实现上述功能，请使用其他类似工具与 `Trojan-R` 组合实现。 56 | 57 | ## 设计原则 58 | 59 | - 安全性 60 | 61 | `Trojan-R` 不涉及底层操作，且目前的性能瓶颈与其无关，无使用 unsafe rust 的必要。协议回落和 TLS 配置等安全敏感代码经过仔细考虑和审计，同时也欢迎更多来自开源社区的安全审计。 62 | 63 | 目前 `Trojan-R` 使用 `#![forbid(unsafe_code)]` 禁用 unsafe rust。如未来有必要使用 unsafe rust 时，必须经过严格审计和测试。 64 | 65 | - 使用静态分发而非动态分发 66 | 67 | 协议实现使用统一的 trait。协议嵌套使用静态分发，以保证嵌套协议栈的函数调用关系在编译时被确定，使编译器可以进行内联和更好的优化。 68 | 69 | - 低内存分配 70 | 71 | 减少热点代码的内存分配，用引用替换复制，以实现更高的性能和更低的内存开销。 72 | 73 | - 简洁 74 | 75 | 保持最简洁干净的实现，以保证最低的代码复杂度，尽可能少的性能开销，并增加可靠性和减少攻击面。 76 | 77 | ## 部署和使用 78 | 79 | `Trojan-R` 使用 toml 进行配置，参考 `config` 文件夹下配置文件。 80 | 81 | ## 编译 82 | 83 | ```shell 84 | cargo build --release 85 | ``` 86 | 87 | 交叉编译基于 `cross` 完成，编译前请确认已经安装 `cross` (`cargo install cross`) 88 | 89 | ```shell 90 | make armv7-unknown-linux-musleabihf 91 | ``` 92 | 93 | 编译默认开启链接时优化，以提升性能并减小可执行文件体积，因此编译耗时可能较其他项目更长。 94 | 95 | 编译完成后可以使用 `strip` 去除调试符号表以减少文件体积。 96 | 97 | ## TODOs 98 | 99 | - [ ] 更完善的交互接口和文档 100 | 101 | - [ ] 更多的单元测试和集成测试 102 | 103 | - [ ] 性能调优 104 | 105 | - [ ] 可复现的 benchmark 环境 106 | 107 | - [ ] 实现 lib.rs 和导出函数 108 | 109 | - [x] 分离客户端和服务端 features 110 | 111 | - [ ] Github Actions 112 | 113 | ## 致谢 114 | 115 | - [trojan](https://github.com/trojan-gfw/trojan) 116 | 117 | - [shadowsocks-rust](https://github.com/shadowsocks/shadowsocks-rust) 118 | -------------------------------------------------------------------------------- /config/client.toml: -------------------------------------------------------------------------------- 1 | mode = "client" 2 | log_level = "debug" # optional 3 | 4 | [trojan] 5 | password = "password" 6 | 7 | [socks5] 8 | addr = "127.0.0.1:1080" 9 | 10 | [tls] 11 | addr = "example.com:443" 12 | sni = "example.com" 13 | cert = "cert.pem" # optional 14 | cipher = ["TLS13_AES_128_GCM_SHA256"] # optional 15 | #cipher = ["TLS13_CHACHA20_POLY1305_SHA256","TLS13_AES_256_GCM_SHA384","TLS13_AES_128_GCM_SHA256","TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256","TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256","TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384","TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256","TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384","TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA25"] 16 | 17 | # optional 18 | #[websocket] 19 | #uri = "wss://example.com/trojanpath" 20 | 21 | # optional 22 | #[mux] 23 | #concurrent = 8 24 | #timeout = 30 25 | -------------------------------------------------------------------------------- /config/forward.toml: -------------------------------------------------------------------------------- 1 | mode = "forward" 2 | log_level = "debug" # optional 3 | 4 | [dokodemo] 5 | target_addr = "8.8.8.8:53" 6 | listen_addr = "127.0.0.1:53" 7 | 8 | [trojan] 9 | password = "password" 10 | 11 | [tls] 12 | addr = "example.com:443" 13 | sni = "example.com" 14 | cert = "cert.pem" # optional 15 | cipher = ["TLS13_AES_128_GCM_SHA256"] # optional 16 | # cipher = ["TLS13_CHACHA20_POLY1305_SHA256","TLS13_AES_256_GCM_SHA384","TLS13_AES_128_GCM_SHA256","TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256","TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256","TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384","TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256","TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384","TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA25"] 17 | 18 | # optional 19 | # [websocket] 20 | # uri = "wss://example.com/trojanpath" 21 | -------------------------------------------------------------------------------- /config/server.toml: -------------------------------------------------------------------------------- 1 | mode = "server" 2 | log_level = "debug" # optional 3 | 4 | [trojan] 5 | password = "password" 6 | fallback_addr = "127.0.0.1:80" 7 | 8 | [tls] 9 | addr = "0.0.0.0:443" 10 | sni = "example.com" 11 | cert = "cert.pem" 12 | key = "key.pem" 13 | 14 | # optional 15 | # [plaintext] 16 | # addr = "127.0.0.1:12345" 17 | 18 | # optional 19 | # [websocket] 20 | # path = "/trojanpath" 21 | 22 | # optional 23 | # [mux] 24 | -------------------------------------------------------------------------------- /src/error/mod.rs: -------------------------------------------------------------------------------- 1 | use std::error; 2 | use std::fmt::{self, Debug, Formatter}; 3 | use std::io; 4 | 5 | #[derive(Clone)] 6 | pub struct Error { 7 | pub message: String, 8 | } 9 | 10 | impl Error { 11 | pub fn new(message: S) -> Error 12 | where 13 | S: Into, 14 | { 15 | Error { 16 | message: message.into(), 17 | } 18 | } 19 | } 20 | 21 | impl Debug for Error { 22 | #[inline] 23 | fn fmt(&self, f: &mut Formatter) -> fmt::Result { 24 | write!(f, "{}", self.message) 25 | } 26 | } 27 | 28 | impl fmt::Display for Error { 29 | #[inline] 30 | fn fmt(&self, f: &mut Formatter) -> fmt::Result { 31 | write!(f, "{}", self.message) 32 | } 33 | } 34 | 35 | impl error::Error for Error {} 36 | 37 | impl From for Error { 38 | fn from(err: io::Error) -> Error { 39 | Error::new(err.to_string()) 40 | } 41 | } 42 | 43 | impl From for io::Error { 44 | fn from(err: Error) -> io::Error { 45 | io::Error::new(io::ErrorKind::Other, err.message) 46 | } 47 | } 48 | -------------------------------------------------------------------------------- /src/main.rs: -------------------------------------------------------------------------------- 1 | #![forbid(unsafe_code)] 2 | 3 | use clap::{App, Arg}; 4 | 5 | mod error; 6 | mod protocol; 7 | mod proxy; 8 | 9 | #[tokio::main] 10 | async fn main() { 11 | let matches = App::new("trojan-r") 12 | .version("v0.1.0") 13 | .arg( 14 | Arg::with_name("config") 15 | .short("c") 16 | .long("config") 17 | .required(true) 18 | .takes_value(true) 19 | .help(".toml config file name"), 20 | ) 21 | .author("Developed by @p4gefau1t (Page Fault)") 22 | .about("An unidentifiable mechanism that helps you bypass GFW") 23 | .get_matches(); 24 | let filename = matches.value_of("config").unwrap().to_string(); 25 | if let Err(e) = proxy::launch_from_config_filename(filename).await { 26 | println!("failed to launch proxy: {}", e); 27 | } 28 | } 29 | -------------------------------------------------------------------------------- /src/protocol/direct/connector.rs: -------------------------------------------------------------------------------- 1 | use std::sync::Arc; 2 | 3 | use async_trait::async_trait; 4 | use tokio::net::{TcpStream, UdpSocket}; 5 | 6 | use crate::protocol::{Address, ProxyConnector}; 7 | 8 | use super::{DirectTcpStream, DirectUdpStream}; 9 | 10 | pub struct DirectConnector {} 11 | 12 | #[async_trait] 13 | impl ProxyConnector for DirectConnector { 14 | type TS = DirectTcpStream; 15 | type US = DirectUdpStream; 16 | 17 | async fn connect_tcp(&self, addr: &Address) -> std::io::Result { 18 | log::debug!("direct: connecting to {}", addr); 19 | let stream = TcpStream::connect(addr.to_string()).await?; 20 | Ok(DirectTcpStream { inner: stream }) 21 | } 22 | 23 | async fn connect_udp(&self) -> std::io::Result { 24 | let socket = Arc::new(UdpSocket::bind(":::0").await?); 25 | Ok(DirectUdpStream { inner: socket }) 26 | } 27 | } 28 | -------------------------------------------------------------------------------- /src/protocol/direct/mod.rs: -------------------------------------------------------------------------------- 1 | use std::{io, pin::Pin, sync::Arc, task::Context, task::Poll}; 2 | 3 | use async_trait::async_trait; 4 | use tokio::{ 5 | io::{AsyncRead, AsyncWrite}, 6 | net::{TcpStream, UdpSocket}, 7 | }; 8 | 9 | use super::ProxyTcpStream; 10 | use crate::protocol::{Address, ProxyUdpStream, UdpRead, UdpWrite}; 11 | 12 | pub mod connector; 13 | 14 | pub struct DirectTcpStream { 15 | inner: TcpStream, 16 | } 17 | 18 | impl DirectTcpStream { 19 | pub fn new(inner: TcpStream) -> Self { 20 | Self { inner } 21 | } 22 | } 23 | 24 | impl AsyncRead for DirectTcpStream { 25 | fn poll_read( 26 | mut self: Pin<&mut Self>, 27 | cx: &mut Context<'_>, 28 | buf: &mut tokio::io::ReadBuf<'_>, 29 | ) -> Poll> { 30 | Pin::new(&mut self.inner).poll_read(cx, buf) 31 | } 32 | } 33 | 34 | impl AsyncWrite for DirectTcpStream { 35 | fn poll_write( 36 | mut self: Pin<&mut Self>, 37 | cx: &mut Context<'_>, 38 | buf: &[u8], 39 | ) -> Poll> { 40 | Pin::new(&mut self.inner).poll_write(cx, buf) 41 | } 42 | 43 | fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { 44 | Pin::new(&mut self.inner).poll_flush(cx) 45 | } 46 | 47 | fn poll_shutdown( 48 | mut self: Pin<&mut Self>, 49 | cx: &mut Context<'_>, 50 | ) -> Poll> { 51 | Pin::new(&mut self.inner).poll_shutdown(cx) 52 | } 53 | } 54 | 55 | impl ProxyTcpStream for DirectTcpStream {} 56 | 57 | #[derive(Clone)] 58 | pub struct DirectUdpStream { 59 | inner: Arc, 60 | } 61 | 62 | #[async_trait] 63 | impl UdpRead for DirectUdpStream { 64 | async fn read_from(&mut self, buf: &mut [u8]) -> io::Result<(usize, Address)> { 65 | let (len, addr) = self.inner.recv_from(buf).await?; 66 | Ok((len, Address::SocketAddress(addr))) 67 | } 68 | } 69 | 70 | #[async_trait] 71 | impl UdpWrite for DirectUdpStream { 72 | async fn write_to(&mut self, buf: &[u8], addr: &Address) -> io::Result<()> { 73 | let _ = self.inner.send_to(buf, addr.to_string()).await?; 74 | Ok(()) 75 | } 76 | } 77 | 78 | #[async_trait] 79 | impl ProxyUdpStream for DirectUdpStream { 80 | type R = Self; 81 | type W = Self; 82 | 83 | fn split(self) -> (Self::R, Self::W) { 84 | (self.clone(), self) 85 | } 86 | 87 | fn reunite(r: Self::R, _: Self::W) -> Self { 88 | r 89 | } 90 | 91 | async fn close(self) -> io::Result<()> { 92 | Ok(()) 93 | } 94 | } 95 | -------------------------------------------------------------------------------- /src/protocol/dokodemo/acceptor.rs: -------------------------------------------------------------------------------- 1 | use crate::protocol::{AcceptResult, Address, ProxyAcceptor, ProxyUdpStream, UdpRead, UdpWrite}; 2 | use async_trait::async_trait; 3 | use serde::Deserialize; 4 | use std::{ 5 | io::Result, 6 | str::FromStr, 7 | sync::{ 8 | atomic::{AtomicBool, Ordering}, 9 | Arc, 10 | }, 11 | }; 12 | use tokio::net::{TcpListener, TcpStream, UdpSocket}; 13 | 14 | #[derive(Deserialize)] 15 | pub struct DokodemoAcceptorConfig { 16 | listen_addr: String, 17 | target_addr: String, 18 | } 19 | 20 | #[derive(Clone)] 21 | pub struct DokodemoUdpStream { 22 | inner: Arc, 23 | addr: Address, 24 | } 25 | 26 | #[async_trait] 27 | impl UdpRead for DokodemoUdpStream { 28 | async fn read_from(&mut self, buf: &mut [u8]) -> Result<(usize, Address)> { 29 | let (len, _) = self.inner.recv_from(buf).await?; 30 | Ok((len, self.addr.clone())) 31 | } 32 | } 33 | 34 | #[async_trait] 35 | impl UdpWrite for DokodemoUdpStream { 36 | async fn write_to(&mut self, buf: &[u8], _: &Address) -> Result<()> { 37 | self.inner.send_to(buf, self.addr.to_string()).await?; 38 | Ok(()) 39 | } 40 | } 41 | 42 | #[async_trait] 43 | impl ProxyUdpStream for DokodemoUdpStream { 44 | type R = Self; 45 | type W = Self; 46 | 47 | fn split(self) -> (Self::R, Self::W) { 48 | (self.clone(), self) 49 | } 50 | 51 | fn reunite(r: Self::R, _: Self::W) -> Self { 52 | r 53 | } 54 | 55 | async fn close(self) -> Result<()> { 56 | Ok(()) 57 | } 58 | } 59 | 60 | pub struct DokodemoAcceptor { 61 | target_addr: Address, 62 | udp_spawned: AtomicBool, 63 | tcp_listener: TcpListener, 64 | } 65 | 66 | #[async_trait] 67 | impl ProxyAcceptor for DokodemoAcceptor { 68 | type TS = TcpStream; 69 | type US = DokodemoUdpStream; 70 | 71 | async fn accept(&self) -> Result> { 72 | if !self.udp_spawned.load(Ordering::Relaxed) { 73 | self.udp_spawned.store(true, Ordering::Relaxed); 74 | let socket = Arc::new(UdpSocket::bind(self.tcp_listener.local_addr().unwrap()).await?); 75 | let udp_stream = DokodemoUdpStream { 76 | inner: socket, 77 | addr: self.target_addr.clone(), 78 | }; 79 | log::info!( 80 | "udp socket listening on {}", 81 | self.tcp_listener.local_addr().unwrap() 82 | ); 83 | return Ok(AcceptResult::Udp(udp_stream)); 84 | } 85 | let (stream, addr) = self.tcp_listener.accept().await?; 86 | log::info!("tcp connection from {}", addr.to_string()); 87 | Ok(AcceptResult::Tcp((stream, self.target_addr.clone()))) 88 | } 89 | } 90 | 91 | impl DokodemoAcceptor { 92 | pub async fn new(config: &DokodemoAcceptorConfig) -> Result { 93 | let tcp_listener = TcpListener::bind(config.listen_addr.clone()).await?; 94 | Ok(DokodemoAcceptor { 95 | target_addr: Address::from_str(&config.target_addr)?, 96 | udp_spawned: AtomicBool::new(false), 97 | tcp_listener, 98 | }) 99 | } 100 | } 101 | -------------------------------------------------------------------------------- /src/protocol/dokodemo/mod.rs: -------------------------------------------------------------------------------- 1 | pub mod acceptor; 2 | -------------------------------------------------------------------------------- /src/protocol/mod.rs: -------------------------------------------------------------------------------- 1 | use async_trait::async_trait; 2 | use bytes::{Buf, BufMut}; 3 | use fmt::Debug; 4 | use std::{ 5 | fmt::{self, Formatter}, 6 | io::{self, Cursor}, 7 | net::{IpAddr, Ipv4Addr, Ipv6Addr, SocketAddr, SocketAddrV4, SocketAddrV6, ToSocketAddrs}, 8 | str::FromStr, 9 | vec, 10 | }; 11 | use tokio::io::{AsyncRead, AsyncReadExt, AsyncWrite}; 12 | 13 | use crate::error::Error; 14 | 15 | pub mod direct; 16 | pub mod dokodemo; 17 | pub mod mux; 18 | pub mod plaintext; 19 | pub mod socks5; 20 | pub mod tls; 21 | pub mod trojan; 22 | pub mod websocket; 23 | 24 | fn new_error(message: T) -> io::Error { 25 | return Error::new(format!("protocol: {}", message.to_string())).into(); 26 | } 27 | 28 | pub trait ProxyTcpStream: AsyncRead + AsyncWrite + Send + Sync + Unpin {} 29 | #[derive(Clone, PartialEq, Eq, Hash)] 30 | pub enum Address { 31 | /// Socket address (IP Address) 32 | SocketAddress(SocketAddr), 33 | /// Domain name address 34 | DomainNameAddress(String, u16), 35 | } 36 | 37 | /// Parse `Address` error 38 | #[derive(Debug)] 39 | pub struct AddressError { 40 | message: String, 41 | } 42 | 43 | impl From for io::Error { 44 | fn from(e: AddressError) -> Self { 45 | io::Error::new( 46 | io::ErrorKind::Other, 47 | format!("address error: {}", e.message), 48 | ) 49 | } 50 | } 51 | 52 | impl FromStr for Address { 53 | type Err = AddressError; 54 | 55 | fn from_str(s: &str) -> Result { 56 | match s.parse::() { 57 | Ok(addr) => Ok(Address::SocketAddress(addr)), 58 | Err(..) => { 59 | let mut sp = s.split(':'); 60 | match (sp.next(), sp.next()) { 61 | (Some(dn), Some(port)) => match port.parse::() { 62 | Ok(port) => Ok(Address::DomainNameAddress(dn.to_owned(), port)), 63 | Err(..) => Err(AddressError { 64 | message: s.to_owned(), 65 | }), 66 | }, 67 | (Some(dn), None) => { 68 | // Assume it is 80 (http's default port) 69 | Ok(Address::DomainNameAddress(dn.to_owned(), 80)) 70 | } 71 | _ => Err(AddressError { 72 | message: s.to_owned(), 73 | }), 74 | } 75 | } 76 | } 77 | } 78 | } 79 | impl Address { 80 | const ADDR_TYPE_IPV4: u8 = 1; 81 | const ADDR_TYPE_DOMAIN_NAME: u8 = 3; 82 | const ADDR_TYPE_IPV6: u8 = 4; 83 | 84 | #[inline] 85 | fn new_dummy_address() -> Address { 86 | Address::SocketAddress(SocketAddr::new(IpAddr::V4(Ipv4Addr::new(0, 0, 0, 0)), 0)) 87 | } 88 | 89 | #[inline] 90 | fn serialized_len(&self) -> usize { 91 | match self { 92 | Address::SocketAddress(SocketAddr::V4(..)) => 1 + 4 + 2, 93 | Address::SocketAddress(SocketAddr::V6(..)) => 1 + 8 * 2 + 2, 94 | Address::DomainNameAddress(ref dmname, _) => 1 + 1 + dmname.len() + 2, 95 | } 96 | } 97 | 98 | async fn read_from_stream(stream: &mut R) -> Result 99 | where 100 | R: AsyncRead + Unpin, 101 | { 102 | let mut addr_type_buf = [0u8; 1]; 103 | let _ = stream.read_exact(&mut addr_type_buf).await?; 104 | 105 | let addr_type = addr_type_buf[0]; 106 | match addr_type { 107 | Self::ADDR_TYPE_IPV4 => { 108 | let mut buf = [0u8; 6]; 109 | stream.read_exact(&mut buf).await?; 110 | let mut cursor = Cursor::new(buf); 111 | 112 | let v4addr = Ipv4Addr::new( 113 | cursor.get_u8(), 114 | cursor.get_u8(), 115 | cursor.get_u8(), 116 | cursor.get_u8(), 117 | ); 118 | let port = cursor.get_u16(); 119 | Ok(Address::SocketAddress(SocketAddr::V4(SocketAddrV4::new( 120 | v4addr, port, 121 | )))) 122 | } 123 | Self::ADDR_TYPE_IPV6 => { 124 | let mut buf = [0u8; 18]; 125 | stream.read_exact(&mut buf).await?; 126 | 127 | let mut cursor = Cursor::new(&buf); 128 | let v6addr = Ipv6Addr::new( 129 | cursor.get_u16(), 130 | cursor.get_u16(), 131 | cursor.get_u16(), 132 | cursor.get_u16(), 133 | cursor.get_u16(), 134 | cursor.get_u16(), 135 | cursor.get_u16(), 136 | cursor.get_u16(), 137 | ); 138 | let port = cursor.get_u16(); 139 | 140 | Ok(Address::SocketAddress(SocketAddr::V6(SocketAddrV6::new( 141 | v6addr, port, 0, 0, 142 | )))) 143 | } 144 | Self::ADDR_TYPE_DOMAIN_NAME => { 145 | let mut length_buf = [0u8; 1]; 146 | let mut addr_buf = [0u8; 255 + 2]; 147 | stream.read_exact(&mut length_buf).await?; 148 | let length = length_buf[0] as usize; 149 | 150 | // Len(Domain) + Len(Port) 151 | stream.read_exact(&mut addr_buf[..length + 2]).await?; 152 | 153 | let domain_buf = &addr_buf[..length]; 154 | let addr = match String::from_utf8(domain_buf.to_vec()) { 155 | Ok(addr) => addr, 156 | Err(..) => return Err(Error::new("invalid address encoding")), 157 | }; 158 | let mut port_buf = &addr_buf[length..length + 2]; 159 | let port = port_buf.get_u16(); 160 | 161 | Ok(Address::DomainNameAddress(addr, port)) 162 | } 163 | _ => { 164 | // Wrong Address Type . Socks5 only supports ipv4, ipv6 and domain name 165 | Err(Error::new(format!( 166 | "not supported address type {:#x}", 167 | addr_type 168 | ))) 169 | } 170 | } 171 | } 172 | 173 | fn read_from_buf(buf: &[u8]) -> io::Result { 174 | let mut cur = Cursor::new(buf); 175 | if cur.remaining() < 1 + 1 { 176 | return Err(new_error("invalid address buffer")); 177 | } 178 | let addr_type = cur.get_u8(); 179 | match addr_type { 180 | Self::ADDR_TYPE_IPV4 => { 181 | if cur.remaining() < 4 + 2 { 182 | return Err(new_error("IPv4 address too short")); 183 | } 184 | let addr = Ipv4Addr::new(cur.get_u8(), cur.get_u8(), cur.get_u8(), cur.get_u8()); 185 | let port = cur.get_u16(); 186 | Ok(Address::SocketAddress(SocketAddr::V4(SocketAddrV4::new( 187 | addr, port, 188 | )))) 189 | } 190 | Self::ADDR_TYPE_DOMAIN_NAME => { 191 | let domain_len = cur.get_u8() as usize; 192 | if cur.remaining() < domain_len { 193 | return Err(new_error("Domain name too short")); 194 | } 195 | let mut domain_name = vec![0u8; domain_len]; 196 | cur.copy_to_slice(&mut domain_name); 197 | let port = cur.get_u16(); 198 | let domain_name = String::from_utf8(domain_name).map_err(|e| { 199 | new_error(format!("invalid utf8 domain name {}", e.to_string())) 200 | })?; 201 | Ok(Address::DomainNameAddress(domain_name, port)) 202 | } 203 | Self::ADDR_TYPE_IPV6 => { 204 | if cur.remaining() < 8 * 2 + 2 { 205 | return Err(new_error("IPv4 address too short")); 206 | } 207 | let addr = Ipv6Addr::new( 208 | cur.get_u16(), 209 | cur.get_u16(), 210 | cur.get_u16(), 211 | cur.get_u16(), 212 | cur.get_u16(), 213 | cur.get_u16(), 214 | cur.get_u16(), 215 | cur.get_u16(), 216 | ); 217 | let port = cur.get_u16(); 218 | Ok(Address::SocketAddress(SocketAddr::V6(SocketAddrV6::new( 219 | addr, port, 0, 0, 220 | )))) 221 | } 222 | _ => Err(new_error(format!("unknown address type {}", addr_type))), 223 | } 224 | } 225 | 226 | fn write_to_buf(&self, buf: &mut B) { 227 | match self { 228 | Self::SocketAddress(SocketAddr::V4(addr)) => { 229 | buf.put_u8(Self::ADDR_TYPE_IPV4); 230 | buf.put_slice(&addr.ip().octets()); 231 | buf.put_u16(addr.port()); 232 | } 233 | Self::SocketAddress(SocketAddr::V6(addr)) => { 234 | buf.put_u8(Self::ADDR_TYPE_IPV6); 235 | for seg in &addr.ip().segments() { 236 | buf.put_u16(*seg); 237 | } 238 | buf.put_u16(addr.port()); 239 | } 240 | Self::DomainNameAddress(domain_name, port) => { 241 | buf.put_u8(Self::ADDR_TYPE_DOMAIN_NAME); 242 | buf.put_u8(domain_name.len() as u8); 243 | buf.put_slice(&domain_name.as_bytes()[..]); 244 | buf.put_u16(*port); 245 | } 246 | } 247 | } 248 | } 249 | 250 | impl Debug for Address { 251 | #[inline] 252 | fn fmt(&self, f: &mut Formatter) -> fmt::Result { 253 | match *self { 254 | Address::SocketAddress(ref addr) => write!(f, "{}", addr), 255 | Address::DomainNameAddress(ref addr, ref port) => write!(f, "{}:{}", addr, port), 256 | } 257 | } 258 | } 259 | 260 | impl fmt::Display for Address { 261 | #[inline] 262 | fn fmt(&self, f: &mut Formatter) -> fmt::Result { 263 | match *self { 264 | Address::SocketAddress(ref addr) => write!(f, "{}", addr), 265 | Address::DomainNameAddress(ref addr, ref port) => write!(f, "{}:{}", addr, port), 266 | } 267 | } 268 | } 269 | 270 | impl ToSocketAddrs for Address { 271 | type Iter = vec::IntoIter; 272 | 273 | fn to_socket_addrs(&self) -> io::Result> { 274 | match self.clone() { 275 | Address::SocketAddress(addr) => Ok(vec![addr].into_iter()), 276 | Address::DomainNameAddress(addr, port) => (&addr[..], port).to_socket_addrs(), 277 | } 278 | } 279 | } 280 | 281 | impl From for Address { 282 | fn from(s: SocketAddr) -> Address { 283 | Address::SocketAddress(s) 284 | } 285 | } 286 | 287 | impl From<(String, u16)> for Address { 288 | fn from((dn, port): (String, u16)) -> Address { 289 | Address::DomainNameAddress(dn, port) 290 | } 291 | } 292 | 293 | impl From<&Address> for Address { 294 | fn from(addr: &Address) -> Address { 295 | addr.clone() 296 | } 297 | } 298 | 299 | #[async_trait] 300 | pub trait UdpRead: Send + Sync + Unpin { 301 | async fn read_from(&mut self, buf: &mut [u8]) -> io::Result<(usize, Address)>; 302 | } 303 | #[async_trait] 304 | pub trait UdpWrite: Send + Sync + Unpin { 305 | async fn write_to(&mut self, buf: &[u8], addr: &Address) -> io::Result<()>; 306 | } 307 | 308 | #[async_trait] 309 | pub trait ProxyUdpStream: Send + Unpin { 310 | type R: UdpRead; 311 | type W: UdpWrite; 312 | fn split(self) -> (Self::R, Self::W); 313 | fn reunite(r: Self::R, w: Self::W) -> Self; 314 | async fn close(self) -> io::Result<()>; 315 | } 316 | 317 | #[async_trait] 318 | pub trait ProxyConnector: Send + Sync { 319 | type TS: ProxyTcpStream + 'static; 320 | type US: ProxyUdpStream + 'static; 321 | async fn connect_tcp(&self, addr: &Address) -> io::Result; 322 | async fn connect_udp(&self) -> io::Result; 323 | } 324 | 325 | pub enum AcceptResult { 326 | Tcp((T, Address)), 327 | Udp(U), 328 | } 329 | 330 | impl AcceptResult { 331 | pub fn unwrap_tcp_with_addr(self) -> (T, Address) { 332 | match self { 333 | Self::Tcp(t) => t, 334 | _ => unreachable!(), 335 | } 336 | } 337 | } 338 | 339 | #[async_trait] 340 | pub trait ProxyAcceptor: Send + Sync { 341 | type TS: ProxyTcpStream + 'static; 342 | type US: ProxyUdpStream + 'static; 343 | async fn accept(&self) -> io::Result>; 344 | } 345 | 346 | pub struct DummyUdpRead {} 347 | 348 | #[async_trait] 349 | impl UdpRead for DummyUdpRead { 350 | async fn read_from(&mut self, _: &mut [u8]) -> io::Result<(usize, Address)> { 351 | unimplemented!() 352 | } 353 | } 354 | 355 | pub struct DummyUdpWrite {} 356 | 357 | #[async_trait] 358 | impl UdpWrite for DummyUdpWrite { 359 | async fn write_to(&mut self, _: &[u8], _: &Address) -> io::Result<()> { 360 | unimplemented!() 361 | } 362 | } 363 | 364 | pub struct DummyUdpStream {} 365 | 366 | #[async_trait] 367 | impl UdpRead for DummyUdpStream { 368 | async fn read_from(&mut self, _: &mut [u8]) -> io::Result<(usize, Address)> { 369 | unimplemented!() 370 | } 371 | } 372 | 373 | #[async_trait] 374 | impl UdpWrite for DummyUdpStream { 375 | async fn write_to(&mut self, _: &[u8], _: &Address) -> io::Result<()> { 376 | unimplemented!() 377 | } 378 | } 379 | 380 | #[async_trait] 381 | impl ProxyUdpStream for DummyUdpStream { 382 | type R = DummyUdpRead; 383 | type W = DummyUdpWrite; 384 | fn split(self) -> (Self::R, Self::W) { 385 | unimplemented!() 386 | } 387 | fn reunite(_: Self::R, _: Self::W) -> Self { 388 | unimplemented!() 389 | } 390 | async fn close(self) -> io::Result<()> { 391 | unimplemented!() 392 | } 393 | } 394 | -------------------------------------------------------------------------------- /src/protocol/mux/acceptor.rs: -------------------------------------------------------------------------------- 1 | use std::{io, sync::Arc}; 2 | 3 | use async_trait::async_trait; 4 | use io::ErrorKind; 5 | use serde::Deserialize; 6 | use tokio::{ 7 | sync::{ 8 | mpsc::{channel, Receiver}, 9 | Mutex, 10 | }, 11 | task::JoinHandle, 12 | }; 13 | 14 | use super::{MuxHandle, MuxStream, MuxUdpStream, RequestHeader, STREAM_CHANNEL_LEN}; 15 | use crate::protocol::{AcceptResult, Address, ProxyAcceptor}; 16 | 17 | #[derive(Deserialize)] 18 | pub struct MuxAcceptorConfig {} 19 | 20 | pub struct MuxAcceptor { 21 | accept_stream_rx: Arc>>>, 22 | handle: JoinHandle>, 23 | } 24 | 25 | impl Drop for MuxAcceptor { 26 | fn drop(&mut self) { 27 | self.handle.abort(); 28 | } 29 | } 30 | 31 | #[async_trait] 32 | impl ProxyAcceptor for MuxAcceptor { 33 | type TS = MuxStream; 34 | type US = MuxUdpStream; 35 | 36 | async fn accept(&self) -> io::Result> { 37 | if let Some(result) = self.accept_stream_rx.lock().await.recv().await { 38 | Ok(result) 39 | } else { 40 | Err(io::ErrorKind::ConnectionReset.into()) 41 | } 42 | } 43 | } 44 | 45 | impl MuxAcceptor { 46 | pub fn new( 47 | inner: T, 48 | _config: &MuxAcceptorConfig, 49 | ) -> io::Result { 50 | let (accept_stream_tx, accept_stream_rx) = channel(STREAM_CHANNEL_LEN); 51 | let handle: JoinHandle> = tokio::spawn(async move { 52 | loop { 53 | let result = match inner.accept().await { 54 | Ok(r) => r, 55 | Err(e) => { 56 | log::error!("mux accept err: {}", e); 57 | continue; 58 | } 59 | }; 60 | match result { 61 | AcceptResult::Tcp((stream, addr)) => { 62 | let accept_stream_tx = accept_stream_tx.clone(); 63 | let _: JoinHandle> = tokio::spawn(async move { 64 | let valid_magic_addr = { 65 | match &addr { 66 | Address::DomainNameAddress(domain, port) => { 67 | domain == "MUX_CONN" && *port == 0 68 | } 69 | _ => false, 70 | } 71 | }; 72 | if !valid_magic_addr { 73 | log::error!("invalid mux magic address {}", addr.to_string()); 74 | return Err(ErrorKind::InvalidData.into()); 75 | } 76 | log::debug!("new inbound stream for mux"); 77 | let mux_handle = MuxHandle::new(stream); 78 | loop { 79 | let mut stream = mux_handle.accept().await?; 80 | log::debug!("new mux stream {:x} accepted", stream.stream_id); 81 | let header = RequestHeader::read_from(&mut stream).await?; 82 | let result = match header { 83 | RequestHeader::TcpConnect(addr) => { 84 | AcceptResult::Tcp((stream, addr)) 85 | } 86 | RequestHeader::UdpAssociate => { 87 | AcceptResult::Udp(MuxUdpStream { inner: stream }) 88 | } 89 | }; 90 | accept_stream_tx 91 | .send(result) 92 | .await 93 | .map_err(|_| io::ErrorKind::ConnectionAborted)?; 94 | } 95 | }); 96 | } 97 | AcceptResult::Udp(_) => { 98 | log::error!("mux: invalid udp stream"); 99 | } 100 | } 101 | } 102 | }); 103 | Ok(Self { 104 | accept_stream_rx: Arc::new(Mutex::new(accept_stream_rx)), 105 | handle, 106 | }) 107 | } 108 | } 109 | -------------------------------------------------------------------------------- /src/protocol/mux/connector.rs: -------------------------------------------------------------------------------- 1 | use std::{ 2 | collections::HashMap, 3 | io, 4 | sync::{atomic::AtomicU32, Arc}, 5 | }; 6 | 7 | use async_trait::async_trait; 8 | use serde::Deserialize; 9 | use tokio::sync::Mutex; 10 | 11 | use super::{new_key, MuxHandle, MuxStream, MuxUdpStream, RequestHeader}; 12 | use crate::protocol::{Address, ProxyConnector}; 13 | 14 | #[derive(Deserialize)] 15 | pub struct MuxConnectorConfig { 16 | concurrent: usize, 17 | } 18 | 19 | pub struct MuxConnector { 20 | handlers: Mutex>, 21 | concurrent: usize, 22 | inner: T, 23 | handle_id_hint: Arc, 24 | } 25 | 26 | impl MuxConnector { 27 | pub fn new(config: &MuxConnectorConfig, inner: T) -> io::Result { 28 | let handlers = Mutex::new(HashMap::new()); 29 | if config.concurrent < 2 { 30 | return Err(io::Error::new( 31 | io::ErrorKind::InvalidData, 32 | "invalid parameters for mux", 33 | )); 34 | } 35 | Ok(Self { 36 | concurrent: config.concurrent, 37 | handlers, 38 | inner, 39 | handle_id_hint: Arc::new(AtomicU32::new(0)), 40 | }) 41 | } 42 | } 43 | 44 | impl MuxConnector { 45 | async fn clean_mux_streams(&self) { 46 | let mut inactive_handle_id = Vec::new(); 47 | let mut handlers = self.handlers.lock().await; 48 | for (handle_id, handle) in handlers.iter() { 49 | let num_streams = handle.established_streams().await; 50 | if num_streams == 0 || handle.is_closed() { 51 | inactive_handle_id.push(*handle_id); 52 | } 53 | log::debug!( 54 | "mux handle {:x}: {}/{}", 55 | *handle_id, 56 | num_streams, 57 | self.concurrent 58 | ); 59 | } 60 | for handle_id in inactive_handle_id.iter() { 61 | let handle = handlers.remove(handle_id).unwrap(); 62 | handle.close().await; // TODO dead lock? 63 | } 64 | } 65 | 66 | async fn spawn_mux_stream(&self) -> io::Result { 67 | let mut handlers = self.handlers.lock().await; 68 | loop { 69 | for (handle_id, handle) in handlers.iter() { 70 | if handle.established_streams().await < self.concurrent { 71 | let stream = match handle.connect().await { 72 | Ok(stream) => stream, 73 | Err(e) => { 74 | log::error!( 75 | "fail to spawn new mux stream from handle {:x}: {}", 76 | *handle_id, 77 | e 78 | ); 79 | handle.close().await; // TODO dead lock? 80 | continue; 81 | } 82 | }; 83 | log::debug!( 84 | "mux stream {:x} spawned from handle {:x}", 85 | stream.stream_id, 86 | handle_id 87 | ); 88 | return Ok(stream); 89 | } 90 | } 91 | let stream = self 92 | .inner 93 | .connect_tcp(&Address::DomainNameAddress("MUX_CONN".to_string(), 0)) 94 | .await?; 95 | let handle = MuxHandle::new(stream); 96 | let handle_id = new_key(&handlers, &self.handle_id_hint); 97 | handlers.insert(handle_id, handle); 98 | log::debug!("new stream spawned for mux"); 99 | } 100 | } 101 | } 102 | 103 | #[async_trait] 104 | impl ProxyConnector for MuxConnector { 105 | type TS = MuxStream; 106 | type US = MuxUdpStream; 107 | 108 | async fn connect_tcp(&self, addr: &Address) -> io::Result { 109 | let mut stream = self.spawn_mux_stream().await?; 110 | self.clean_mux_streams().await; 111 | let header = RequestHeader::TcpConnect(addr.clone()); 112 | header.write_to(&mut stream).await?; 113 | return Ok(stream); 114 | } 115 | 116 | async fn connect_udp(&self) -> io::Result { 117 | let mut stream = self.spawn_mux_stream().await?; 118 | self.clean_mux_streams().await; 119 | let header = RequestHeader::UdpAssociate; 120 | header.write_to(&mut stream).await?; 121 | Ok(MuxUdpStream { inner: stream }) 122 | } 123 | } 124 | -------------------------------------------------------------------------------- /src/protocol/mux/mod.rs: -------------------------------------------------------------------------------- 1 | use async_trait::async_trait; 2 | use bytes::{Buf, BufMut, Bytes}; 3 | use futures_core::{ready, Future}; 4 | use futures_util::FutureExt; 5 | use tokio::{ 6 | io::{split, AsyncRead, AsyncReadExt, AsyncWrite, AsyncWriteExt, ReadHalf, WriteHalf}, 7 | sync::{ 8 | mpsc::{ 9 | channel, 10 | error::{SendError, TrySendError}, 11 | Receiver, Sender, 12 | }, 13 | Mutex, 14 | }, 15 | task::JoinHandle, 16 | }; 17 | 18 | use std::{ 19 | cmp::min, 20 | collections::HashMap, 21 | io::{self, Cursor}, 22 | num::Wrapping, 23 | pin::Pin, 24 | sync::{ 25 | atomic::{AtomicBool, AtomicU32, Ordering}, 26 | Arc, 27 | }, 28 | task::{Context, Poll}, 29 | }; 30 | 31 | use super::{trojan::UdpHeader, Address, ProxyTcpStream, ProxyUdpStream, UdpRead, UdpWrite}; 32 | use crate::error::Error; 33 | 34 | pub mod acceptor; 35 | pub mod connector; 36 | 37 | fn new_error(message: T) -> io::Error { 38 | return Error::new(format!("mux: {}", message.to_string())).into(); 39 | } 40 | 41 | const SMUX_VERSION: u8 = 1; 42 | const HEADER_LEN: usize = 8; 43 | const MAX_DATA_LEN: usize = 0xffff; 44 | 45 | const CMD_SYNC: u8 = 0; 46 | const CMD_FINISH: u8 = 1; 47 | const CMD_PUSH: u8 = 2; 48 | const CMD_NOP: u8 = 3; 49 | 50 | const SHARED_CHANNEL_LEN: usize = 0x200; 51 | const PRIVATE_CHANNEL_LEN: usize = 0x50; 52 | const STREAM_CHANNEL_LEN: usize = 0x20; 53 | 54 | const CMD_TCP_CONNECT: u8 = 0x01; 55 | const CMD_UDP_ASSOCIATE: u8 = 0x03; 56 | 57 | enum RequestHeader { 58 | TcpConnect(Address), 59 | UdpAssociate, 60 | } 61 | 62 | impl RequestHeader { 63 | async fn read_from(stream: &mut R) -> io::Result 64 | where 65 | R: AsyncRead + Unpin, 66 | { 67 | let mut cmd = [0u8; 1]; 68 | stream.read_exact(&mut cmd).await?; 69 | let addr = Address::read_from_stream(stream).await?; 70 | match cmd[0] { 71 | CMD_TCP_CONNECT => Ok(Self::TcpConnect(addr)), 72 | CMD_UDP_ASSOCIATE => Ok(Self::UdpAssociate), 73 | _ => Err(new_error("invalid cmd")), 74 | } 75 | } 76 | 77 | async fn write_to(&self, w: &mut W) -> io::Result<()> 78 | where 79 | W: AsyncWrite + Unpin, 80 | { 81 | let dummy_addr = Address::new_dummy_address(); 82 | let (cmd, addr) = match self { 83 | RequestHeader::TcpConnect(addr) => (CMD_TCP_CONNECT, addr), 84 | RequestHeader::UdpAssociate => (CMD_UDP_ASSOCIATE, &dummy_addr), 85 | }; 86 | let mut buf = Vec::with_capacity(1 + addr.serialized_len()); 87 | let cursor = &mut buf; 88 | 89 | cursor.put_u8(cmd); 90 | addr.write_to_buf(cursor); 91 | 92 | w.write(&buf).await?; 93 | Ok(()) 94 | } 95 | } 96 | 97 | struct SyncFrame { 98 | stream_id: u32, 99 | } 100 | 101 | struct PushFrame { 102 | stream_id: u32, 103 | data: Bytes, 104 | } 105 | 106 | struct FinishFrame { 107 | stream_id: u32, 108 | } 109 | 110 | struct NopFrame { 111 | stream_id: u32, 112 | } 113 | 114 | enum MuxFrame { 115 | Sync(SyncFrame), 116 | Push(PushFrame), 117 | Finish(FinishFrame), 118 | Nop(NopFrame), 119 | } 120 | 121 | impl MuxFrame { 122 | async fn write_to(&self, writer: &mut W) -> io::Result<()> { 123 | let (stream_id, command) = match self { 124 | MuxFrame::Sync(f) => (f.stream_id, CMD_SYNC), 125 | MuxFrame::Finish(f) => (f.stream_id, CMD_FINISH), 126 | MuxFrame::Nop(f) => (f.stream_id, CMD_NOP), 127 | MuxFrame::Push(f) => (f.stream_id, CMD_PUSH), 128 | }; 129 | let mut buf = [0u8; HEADER_LEN]; 130 | let mut cursor = &mut buf[..]; 131 | let data_length = if let MuxFrame::Push(f) = self { 132 | f.data.len() 133 | } else { 134 | 0 135 | }; 136 | assert!(data_length <= MAX_DATA_LEN); 137 | cursor.put_u8(SMUX_VERSION); 138 | cursor.put_u8(command); 139 | cursor.put_u16_le(data_length as u16); 140 | cursor.put_u32_le(stream_id); 141 | writer.write(&buf).await?; 142 | if let MuxFrame::Push(f) = self { 143 | writer.write(&f.data).await?; 144 | } 145 | writer.flush().await?; 146 | Ok(()) 147 | } 148 | 149 | async fn read_from(reader: &mut R) -> io::Result { 150 | let mut buf = [0u8; HEADER_LEN]; 151 | reader.read_exact(&mut buf).await?; 152 | 153 | let mut cursor = Cursor::new(buf); 154 | let version = cursor.get_u8(); 155 | if version != SMUX_VERSION { 156 | return Err(new_error("invalid mux version")); 157 | } 158 | let command = cursor.get_u8(); 159 | let length = cursor.get_u16_le(); 160 | let stream_id = cursor.get_u32_le(); 161 | 162 | let frame = match command { 163 | CMD_FINISH => MuxFrame::Finish(FinishFrame { stream_id }), 164 | CMD_NOP => MuxFrame::Nop(NopFrame { stream_id }), 165 | CMD_SYNC => MuxFrame::Sync(SyncFrame { stream_id }), 166 | CMD_PUSH => { 167 | let mut buf = Vec::with_capacity(length as usize); 168 | buf.resize(length as usize, 0); 169 | reader.read_exact(&mut buf).await?; 170 | MuxFrame::Push(PushFrame { 171 | stream_id, 172 | data: Bytes::from(buf), 173 | }) 174 | } 175 | _ => return Err(new_error("invalid mux command")), 176 | }; 177 | 178 | Ok(frame) 179 | } 180 | } 181 | 182 | fn new_key(map: &HashMap, hint: &AtomicU32) -> u32 { 183 | let init_hint = hint.load(Ordering::Relaxed); 184 | let mut key = Wrapping(init_hint + 1); 185 | loop { 186 | if !map.contains_key(&key.0) { 187 | hint.store(key.0, Ordering::Relaxed); 188 | return key.0; 189 | } 190 | key.0 += 1; 191 | if key.0 == init_hint { 192 | panic!(); 193 | } 194 | } 195 | } 196 | 197 | pub struct MuxStream { 198 | tx: Sender, 199 | stream_id: u32, 200 | rx: Receiver, 201 | read_buffer: Option, 202 | write_buffer: Option, 203 | write_future: 204 | Option>> + Send + Sync>>>, 205 | closed: Arc, 206 | } 207 | 208 | impl MuxStream { 209 | #[inline] 210 | fn is_closed(&self) -> bool { 211 | self.closed.load(Ordering::Relaxed) 212 | } 213 | } 214 | 215 | impl AsyncRead for MuxStream { 216 | fn poll_read( 217 | mut self: Pin<&mut Self>, 218 | cx: &mut Context<'_>, 219 | buf: &mut tokio::io::ReadBuf<'_>, 220 | ) -> Poll> { 221 | loop { 222 | if let Some(read_buffer) = &mut self.read_buffer { 223 | if read_buffer.len() <= buf.remaining() { 224 | buf.put_slice(read_buffer); 225 | self.read_buffer = None; 226 | } else { 227 | let len = buf.remaining(); 228 | buf.put_slice(&read_buffer[..len]); 229 | read_buffer.advance(len); 230 | } 231 | return Poll::Ready(Ok(())); 232 | } 233 | if let Some(f) = ready!(self.rx.poll_recv(cx)) { 234 | self.read_buffer = Some(f.data); 235 | } else { 236 | return Poll::Ready(Err(io::ErrorKind::ConnectionReset.into())); 237 | } 238 | } 239 | } 240 | } 241 | 242 | impl MuxStream { 243 | fn try_send_frame(&mut self, frame: MuxFrame) -> io::Result { 244 | if self.is_closed() { 245 | return Err(io::ErrorKind::ConnectionReset.into()); 246 | } 247 | // FIXME horrible workaround 248 | if let Err(e) = self.tx.try_send(frame) { 249 | match e { 250 | TrySendError::Full(f) => { 251 | let tx = self.tx.clone(); 252 | let fut = Box::pin(async move { 253 | tx.send(f).await?; 254 | Ok(()) 255 | }); 256 | self.write_future = Some(fut); 257 | Ok(false) 258 | } 259 | TrySendError::Closed(_) => Err(io::ErrorKind::ConnectionReset.into()), 260 | } 261 | } else { 262 | Ok(true) 263 | } 264 | } 265 | } 266 | 267 | impl AsyncWrite for MuxStream { 268 | fn poll_write( 269 | mut self: Pin<&mut Self>, 270 | cx: &mut Context<'_>, 271 | buf: &[u8], 272 | ) -> Poll> { 273 | if self.is_closed() { 274 | return Poll::Ready(Err(io::ErrorKind::ConnectionReset.into())); 275 | } 276 | loop { 277 | if let Some(fut) = &mut self.write_future { 278 | if ready!(fut.poll_unpin(cx)).is_err() { 279 | return Poll::Ready(Err(io::ErrorKind::ConnectionReset.into())); 280 | } 281 | self.write_future = None; 282 | if self.write_buffer.is_none() { 283 | return Poll::Ready(Ok(buf.len())); 284 | } 285 | } 286 | 287 | let stream_id = self.stream_id; 288 | if let Some(mut data) = self.write_buffer.take() { 289 | let mut all_sent = true; 290 | while data.len() > MAX_DATA_LEN { 291 | let fragment = data.split_off(MAX_DATA_LEN); 292 | let frame = MuxFrame::Push(PushFrame { 293 | stream_id, 294 | data: fragment, 295 | }); 296 | if !self.try_send_frame(frame)? { 297 | // pending 298 | all_sent = false; 299 | break; 300 | } 301 | } 302 | if !all_sent { 303 | self.write_buffer = Some(data); 304 | // poll write_future 305 | continue; 306 | } 307 | // the last frame 308 | let frame = MuxFrame::Push(PushFrame { stream_id, data }); 309 | if !self.try_send_frame(frame)? { 310 | // poll write_future, return Ready once the future is done 311 | self.write_buffer = None; 312 | continue; 313 | } else { 314 | return Poll::Ready(Ok(buf.len())); 315 | } 316 | } 317 | 318 | // self.write_buffer == None, first polling 319 | let data = Bytes::copy_from_slice(buf); 320 | self.write_buffer = Some(data); 321 | } 322 | } 323 | 324 | fn poll_flush(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll> { 325 | return Poll::Ready(Ok(())); 326 | } 327 | 328 | fn poll_shutdown( 329 | mut self: Pin<&mut Self>, 330 | cx: &mut Context<'_>, 331 | ) -> Poll> { 332 | loop { 333 | if let Some(fut) = &mut self.write_future { 334 | if ready!(fut.poll_unpin(cx)).is_err() { 335 | return Poll::Ready(Err(io::ErrorKind::ConnectionReset.into())); 336 | } 337 | self.write_future = None; 338 | if self.write_buffer.is_none() { 339 | break; 340 | } 341 | } 342 | let stream_id = self.stream_id; 343 | if let Some(mut data) = self.write_buffer.take() { 344 | let mut all_sent = true; 345 | while data.len() > MAX_DATA_LEN { 346 | let fragment = data.split_off(MAX_DATA_LEN); 347 | let frame = MuxFrame::Push(PushFrame { 348 | stream_id, 349 | data: fragment, 350 | }); 351 | if !self.try_send_frame(frame)? { 352 | all_sent = false; 353 | break; 354 | } 355 | } 356 | if !all_sent { 357 | self.write_buffer = Some(data); 358 | // poll write_future 359 | continue; 360 | } 361 | // the last frame 362 | let frame = MuxFrame::Push(PushFrame { stream_id, data }); 363 | if !self.try_send_frame(frame)? { 364 | self.write_buffer = None; 365 | continue; 366 | } else { 367 | break; 368 | } 369 | } 370 | break; 371 | } 372 | 373 | self.closed.store(true, Ordering::Relaxed); 374 | let frame = MuxFrame::Finish(FinishFrame { 375 | stream_id: self.stream_id, 376 | }); 377 | 378 | // FIXME horrible workaround 379 | if let Err(e) = self.tx.try_send(frame) { 380 | let tx = self.tx.clone(); 381 | match e { 382 | TrySendError::Full(frame) => { 383 | tokio::spawn(async move { 384 | let _ = tx.send(frame).await; 385 | }); 386 | } 387 | TrySendError::Closed(_) => {} 388 | } 389 | } 390 | return Poll::Ready(Ok(())); 391 | } 392 | } 393 | 394 | impl Drop for MuxStream { 395 | fn drop(&mut self) { 396 | if !self.closed.load(Ordering::Relaxed) { 397 | log::debug!("MuxStream was dropped without calling shutdown"); 398 | self.closed.store(true, Ordering::Relaxed); 399 | let frame = MuxFrame::Finish(FinishFrame { 400 | stream_id: self.stream_id, 401 | }); 402 | if let Err(e) = self.tx.try_send(frame) { 403 | match e { 404 | TrySendError::Full(f) => { 405 | let tx = self.tx.clone(); 406 | tokio::spawn(async move { 407 | let _ = tx.send(f).await; 408 | }); 409 | } 410 | TrySendError::Closed(_) => {} 411 | } 412 | } 413 | } 414 | } 415 | } 416 | 417 | impl MuxStream { 418 | fn new( 419 | stream_id: u32, 420 | tx: Sender, 421 | rx: Receiver, 422 | ) -> (Self, Arc) { 423 | let closed = Arc::new(AtomicBool::new(false)); 424 | ( 425 | MuxStream { 426 | rx, 427 | read_buffer: None, 428 | write_buffer: None, 429 | closed: closed.clone(), 430 | tx, 431 | stream_id, 432 | write_future: None, 433 | }, 434 | closed, 435 | ) 436 | } 437 | } 438 | 439 | impl ProxyTcpStream for MuxStream {} 440 | 441 | #[async_trait] 442 | impl UdpRead for ReadHalf { 443 | async fn read_from(&mut self, buf: &mut [u8]) -> io::Result<(usize, Address)> { 444 | let udp_header = UdpHeader::read_from(self).await?; 445 | let len = min(udp_header.payload_len as usize, buf.len()); 446 | self.read_exact(&mut buf[..len]).await?; 447 | Ok((len, udp_header.address)) 448 | } 449 | } 450 | 451 | #[async_trait] 452 | impl UdpWrite for WriteHalf { 453 | async fn write_to(&mut self, buf: &[u8], addr: &Address) -> io::Result<()> { 454 | let len = min(buf.len(), MAX_DATA_LEN); 455 | let udp_header = UdpHeader::new(addr, len); 456 | udp_header.write_to(self).await?; 457 | self.write(buf).await?; 458 | Ok(()) 459 | } 460 | } 461 | 462 | pub struct MuxUdpStream { 463 | inner: MuxStream, 464 | } 465 | 466 | #[async_trait] 467 | impl ProxyUdpStream for MuxUdpStream { 468 | type R = ReadHalf; 469 | type W = WriteHalf; 470 | 471 | fn split(self) -> (Self::R, Self::W) { 472 | split(self.inner) 473 | } 474 | 475 | fn reunite(r: Self::R, w: Self::W) -> Self { 476 | MuxUdpStream { 477 | inner: r.unsplit(w), 478 | } 479 | } 480 | 481 | async fn close(mut self) -> io::Result<()> { 482 | self.inner.shutdown().await 483 | } 484 | } 485 | 486 | struct MuxStreamHandle { 487 | closed: Arc, 488 | tx: Sender, 489 | } 490 | 491 | impl MuxStreamHandle { 492 | #[inline] 493 | fn close(&self) { 494 | self.closed.store(true, Ordering::Relaxed); 495 | } 496 | } 497 | 498 | struct MuxHandle { 499 | read_handle: JoinHandle>, 500 | write_handle: JoinHandle>, 501 | write_tx: Sender, 502 | accept_stream_rx: Arc>>, 503 | mux_map: Arc>>, 504 | closed: Arc, 505 | stream_id_hint: Arc, 506 | } 507 | 508 | impl Drop for MuxHandle { 509 | fn drop(&mut self) { 510 | self.read_handle.abort(); 511 | self.write_handle.abort(); 512 | } 513 | } 514 | 515 | impl MuxHandle { 516 | fn new(inner: T) -> Self { 517 | let (mut r, mut w) = split(inner); 518 | let mux_map = Arc::new(Mutex::new(HashMap::new())); 519 | let (write_tx, mut write_rx) = channel(SHARED_CHANNEL_LEN); 520 | let (accept_stream_tx, accept_stream_rx) = channel(STREAM_CHANNEL_LEN); 521 | let closed = Arc::new(AtomicBool::new(false)); 522 | let read_handle: JoinHandle> = { 523 | let write_tx = write_tx.clone(); 524 | let mux_map = mux_map.clone(); 525 | let closed = closed.clone(); 526 | tokio::spawn(async move { 527 | async fn echo_finish_frame( 528 | stream_id: u32, 529 | write_tx: &Sender, 530 | ) -> io::Result<()> { 531 | let new_frame = MuxFrame::Finish(FinishFrame { stream_id }); 532 | write_tx 533 | .send(new_frame) 534 | .await 535 | .map_err(|_| io::ErrorKind::ConnectionReset)?; 536 | log::debug!("echo finish frame {:x}", stream_id); 537 | Ok(()) 538 | } 539 | let fut = { 540 | let mux_map = mux_map.clone(); 541 | // stupid workaround 542 | async move { 543 | if false { 544 | return Err(io::Error::new(io::ErrorKind::ConnectionReset, "")); 545 | } 546 | if false { 547 | return Ok(()); 548 | } 549 | loop { 550 | let frame = MuxFrame::read_from(&mut r).await?; 551 | match frame { 552 | MuxFrame::Sync(f) => { 553 | let stream_id = f.stream_id; 554 | let (tx, rx) = channel(PRIVATE_CHANNEL_LEN); 555 | let (stream, closed) = 556 | MuxStream::new(stream_id, write_tx.clone(), rx); 557 | mux_map 558 | .lock() 559 | .await 560 | .insert(f.stream_id, MuxStreamHandle { tx, closed }); 561 | accept_stream_tx 562 | .send(stream) 563 | .await 564 | .map_err(|_| io::ErrorKind::ConnectionReset)?; 565 | } 566 | MuxFrame::Push(f) => { 567 | let stream_id = f.stream_id; 568 | let tx = { 569 | let m = mux_map.lock().await; 570 | if let Some(handle) = m.get(&stream_id) { 571 | handle.tx.clone() 572 | } else { 573 | log::debug!( 574 | "invalid frame recvd, stream_id = {:x}", 575 | stream_id 576 | ); 577 | continue; 578 | } 579 | }; 580 | if let Err(_) = tx.send(f).await { 581 | log::debug!( 582 | "frame recvd but the stream {:x} is closed", 583 | stream_id 584 | ); 585 | if let Some(_) = mux_map.lock().await.remove(&stream_id) { 586 | echo_finish_frame(stream_id, &write_tx).await?; 587 | } 588 | } 589 | } 590 | MuxFrame::Finish(f) => { 591 | let stream_id = f.stream_id; 592 | if let Some(stream_handle) = 593 | mux_map.lock().await.remove(&stream_id) 594 | { 595 | stream_handle.close(); 596 | echo_finish_frame(stream_id, &write_tx).await?; 597 | } 598 | 599 | log::debug!("remote shutdown stream {:x}", stream_id); 600 | } 601 | MuxFrame::Nop(_) => {} 602 | } 603 | } 604 | } 605 | }; 606 | let _ = fut.await; 607 | closed.store(true, Ordering::Relaxed); 608 | mux_map.lock().await.clear(); 609 | log::debug!("mux read err"); 610 | Ok(()) 611 | }) 612 | }; 613 | let write_handle: JoinHandle> = { 614 | let mux_map = mux_map.clone(); 615 | let closed = closed.clone(); 616 | tokio::spawn(async move { 617 | let fut = { 618 | let mux_map = mux_map.clone(); 619 | async move { 620 | // Stupid workaround 621 | if false { 622 | return Err(io::Error::new(io::ErrorKind::ConnectionReset, "")); 623 | } 624 | loop { 625 | if let Some(mut frame) = write_rx.recv().await { 626 | match &mut frame { 627 | MuxFrame::Push(p) => { 628 | assert!(p.data.len() < MAX_DATA_LEN); 629 | } 630 | MuxFrame::Finish(f) => { 631 | log::debug!("local shutdown stream {:x}", f.stream_id); 632 | if let None = mux_map.lock().await.remove(&f.stream_id) { 633 | continue; 634 | } 635 | } 636 | _ => {} 637 | } 638 | frame.write_to(&mut w).await?; 639 | } else { 640 | log::debug!("all write_tx are closed",); 641 | return Ok(()); 642 | } 643 | } 644 | } 645 | }; 646 | if let Err(e) = fut.await { 647 | log::error!("mux write err {}", e); 648 | closed.store(true, Ordering::Relaxed); 649 | } 650 | mux_map.lock().await.clear(); 651 | Ok(()) 652 | }) 653 | }; 654 | Self { 655 | read_handle, 656 | write_handle, 657 | write_tx, 658 | accept_stream_rx: Arc::new(Mutex::new(accept_stream_rx)), 659 | mux_map, 660 | closed, 661 | stream_id_hint: Arc::new(AtomicU32::new(0)), 662 | } 663 | } 664 | 665 | async fn generate_stream_id(&self) -> u32 { 666 | let mux_map = self.mux_map.lock().await; 667 | let stream_id = new_key(&mux_map, &self.stream_id_hint); 668 | stream_id 669 | } 670 | 671 | async fn connect(&self) -> io::Result { 672 | let stream_id = self.generate_stream_id().await; 673 | let (tx, rx) = channel(PRIVATE_CHANNEL_LEN); 674 | let frame = MuxFrame::Sync(SyncFrame { stream_id }); 675 | self.write_tx 676 | .send(frame) 677 | .await 678 | .map_err(|_| io::ErrorKind::ConnectionReset)?; 679 | let (stream, closed) = MuxStream::new(stream_id, self.write_tx.clone(), rx); 680 | self.mux_map 681 | .lock() 682 | .await 683 | .insert(stream_id, MuxStreamHandle { closed, tx }); 684 | Ok(stream) 685 | } 686 | 687 | async fn accept(&self) -> io::Result { 688 | if let Some(stream) = self.accept_stream_rx.lock().await.recv().await { 689 | Ok(stream) 690 | } else { 691 | Err(io::ErrorKind::ConnectionReset.into()) 692 | } 693 | } 694 | 695 | #[inline] 696 | async fn established_streams(&self) -> usize { 697 | self.mux_map.lock().await.len() 698 | } 699 | 700 | #[inline] 701 | fn is_closed(&self) -> bool { 702 | self.closed.load(Ordering::Relaxed) 703 | } 704 | 705 | #[inline] 706 | async fn close(&self) { 707 | self.closed.store(true, Ordering::Relaxed); 708 | 709 | // drop inner 710 | self.read_handle.abort(); 711 | self.write_handle.abort(); 712 | 713 | let mut mux_map = self.mux_map.lock().await; 714 | for (_, stream_handle) in mux_map.iter() { 715 | stream_handle.close(); 716 | } 717 | mux_map.clear(); 718 | } 719 | } 720 | -------------------------------------------------------------------------------- /src/protocol/plaintext/acceptor.rs: -------------------------------------------------------------------------------- 1 | use std::io; 2 | 3 | use async_trait::async_trait; 4 | use serde::Deserialize; 5 | use tokio::net::TcpListener; 6 | 7 | use crate::protocol::{ 8 | direct::DirectTcpStream, AcceptResult, Address, DummyUdpStream, ProxyAcceptor, 9 | }; 10 | 11 | #[derive(Deserialize)] 12 | pub struct PlaintextAcceptorConfig { 13 | addr: String, 14 | } 15 | 16 | pub struct PlaintextAcceptor { 17 | inner: TcpListener, 18 | } 19 | 20 | #[async_trait] 21 | impl ProxyAcceptor for PlaintextAcceptor { 22 | type TS = DirectTcpStream; 23 | type US = DummyUdpStream; 24 | 25 | async fn accept(&self) -> io::Result> { 26 | let (stream, addr) = self.inner.accept().await?; 27 | let addr = Address::from(addr); 28 | Ok(AcceptResult::Tcp((DirectTcpStream::new(stream), addr))) 29 | } 30 | } 31 | 32 | impl PlaintextAcceptor { 33 | pub async fn new(config: &PlaintextAcceptorConfig) -> io::Result { 34 | let listener = TcpListener::bind(&config.addr).await?; 35 | Ok(Self { inner: listener }) 36 | } 37 | } 38 | -------------------------------------------------------------------------------- /src/protocol/plaintext/mod.rs: -------------------------------------------------------------------------------- 1 | pub mod acceptor; 2 | -------------------------------------------------------------------------------- /src/protocol/socks5/acceptor.rs: -------------------------------------------------------------------------------- 1 | use async_trait::async_trait; 2 | use bytes::{BufMut, BytesMut}; 3 | use serde::Deserialize; 4 | use std::{io, net::SocketAddr, sync::Arc}; 5 | use tokio::{ 6 | io::AsyncReadExt, 7 | net::{TcpListener, TcpStream, UdpSocket}, 8 | sync::{ 9 | broadcast::{channel, Receiver, Sender}, 10 | RwLock, 11 | }, 12 | }; 13 | 14 | use super::{ 15 | new_error, Command, HandshakeRequest, HandshakeResponse, TcpRequestHeader, TcpResponseHeader, 16 | UdpAssociateHeader, AUTH_METHOD_NONE, 17 | }; 18 | use crate::protocol::{ 19 | AcceptResult, Address, ProxyAcceptor, ProxyTcpStream, ProxyUdpStream, UdpRead, UdpWrite, 20 | }; 21 | 22 | #[derive(Deserialize)] 23 | pub struct Socks5AcceptorConfig { 24 | addr: String, 25 | } 26 | 27 | pub struct Socks5UdpStream { 28 | src_addr: Arc>>, 29 | inner: Arc, 30 | shutdown_tx: Sender<()>, 31 | shutdown_rx: Receiver<()>, 32 | } 33 | 34 | const UDP_BUFFER_SIZE: usize = 0x2000; 35 | 36 | #[async_trait] 37 | impl UdpRead for Socks5UdpStream { 38 | async fn read_from(&mut self, buf: &mut [u8]) -> io::Result<(usize, Address)> { 39 | let mut recv_buf = [0u8; UDP_BUFFER_SIZE]; 40 | let (recv_len, addr) = tokio::select! { 41 | result = self.inner.recv_from(&mut recv_buf) => { 42 | result? 43 | } 44 | _ = self.shutdown_rx.recv() => { 45 | return Err(io::ErrorKind::ConnectionReset.into()); 46 | } 47 | }; 48 | 49 | let src_address = self.src_addr.read().await.clone(); 50 | if src_address.is_none() { 51 | // first packet 52 | self.src_addr.write().await.replace(addr); 53 | } else if src_address.unwrap() != addr { 54 | return Err(new_error("udp packet from unknown source")); 55 | } 56 | log::debug!("recv_len={}", recv_len); 57 | let header = UdpAssociateHeader::read_from_buf(&recv_buf[..recv_len])?; 58 | let header_len = header.serialized_len(); 59 | let payload_len = recv_len - header_len; 60 | buf[..payload_len].copy_from_slice(&recv_buf[header_len..recv_len]); 61 | log::debug!("payload={}, addr={}", payload_len, header.address); 62 | Ok((payload_len, header.address)) 63 | } 64 | } 65 | 66 | #[async_trait] 67 | impl UdpWrite for Socks5UdpStream { 68 | async fn write_to(&mut self, buf: &[u8], addr: &Address) -> io::Result<()> { 69 | let header = UdpAssociateHeader::new(0, addr.clone()); 70 | let mut send_buf = BytesMut::with_capacity(header.serialized_len() + buf.len()); 71 | header.write_to_buf(&mut send_buf); 72 | send_buf.put_slice(buf); 73 | let address = self.src_addr.read().await; 74 | if address.is_none() { 75 | return Err(new_error("uninitialized udp socket")); 76 | } 77 | let address = address.unwrap(); 78 | self.inner.send_to(&send_buf, address).await?; 79 | Ok(()) 80 | } 81 | } 82 | 83 | #[async_trait] 84 | impl ProxyUdpStream for Socks5UdpStream { 85 | type R = Self; 86 | type W = Self; 87 | 88 | fn split(self) -> (Self::R, Self::W) { 89 | let a = self; 90 | let b = Self { 91 | src_addr: a.src_addr.clone(), 92 | inner: a.inner.clone(), 93 | shutdown_rx: a.shutdown_tx.subscribe(), 94 | shutdown_tx: a.shutdown_tx.clone(), 95 | }; 96 | (a, b) 97 | } 98 | 99 | fn reunite(r: Self::R, _: Self::W) -> Self { 100 | r 101 | } 102 | 103 | async fn close(self) -> io::Result<()> { 104 | Ok(()) 105 | } 106 | } 107 | 108 | pub struct Socks5Acceptor { 109 | tcp_listener: TcpListener, 110 | } 111 | 112 | impl Socks5Acceptor { 113 | pub async fn new(config: &Socks5AcceptorConfig) -> io::Result { 114 | let tcp_listener = TcpListener::bind(config.addr.to_owned()).await?; 115 | Ok(Self { tcp_listener }) 116 | } 117 | } 118 | 119 | impl ProxyTcpStream for TcpStream {} 120 | 121 | #[async_trait] 122 | impl ProxyAcceptor for Socks5Acceptor { 123 | type TS = TcpStream; 124 | type US = Socks5UdpStream; 125 | 126 | async fn accept(&self) -> io::Result> { 127 | let (mut stream, addr) = self.tcp_listener.accept().await?; 128 | log::info!("socks5 stream from address {}", addr); 129 | 130 | // 1. handshake 131 | let req = HandshakeRequest::read_from(&mut stream).await?; 132 | if !req.methods.contains(&AUTH_METHOD_NONE) { 133 | return Err(new_error("invalid handshake method")); 134 | } 135 | let resp = HandshakeResponse::new(AUTH_METHOD_NONE); 136 | resp.write_to(&mut stream).await?; 137 | 138 | // 2. parse 139 | let req = TcpRequestHeader::read_from(&mut stream).await?; 140 | 141 | // 3. respond 142 | return match req.command { 143 | Command::TcpConnect => { 144 | let resp = 145 | TcpResponseHeader::new(Address::SocketAddress(self.tcp_listener.local_addr()?)); 146 | resp.write_to(&mut stream).await?; 147 | Ok(AcceptResult::Tcp((stream, req.address))) 148 | } 149 | Command::UdpAssociate => { 150 | log::debug!("udp associate"); 151 | let ip = self.tcp_listener.local_addr().unwrap().ip(); 152 | let socket_addr = SocketAddr::new(ip, 0); 153 | let udp_socket = Arc::new(UdpSocket::bind(socket_addr).await?); 154 | let resp = TcpResponseHeader::new(Address::SocketAddress(udp_socket.local_addr()?)); 155 | log::debug!( 156 | "udp socket listening on {}", 157 | udp_socket.local_addr().unwrap() 158 | ); 159 | let (shutdown_tx, shutdown_rx) = channel(16); 160 | resp.write_to(&mut stream).await?; 161 | { 162 | let shutdown_tx = shutdown_tx.clone(); 163 | // keep tcp connection alive 164 | tokio::spawn(async move { 165 | let mut buf = [0u8; 0x10]; 166 | let _ = stream.read(&mut buf).await; 167 | log::debug!("shutting down udp session.."); 168 | let _ = shutdown_tx.send(()); 169 | }); 170 | } 171 | Ok(AcceptResult::Udp(Socks5UdpStream { 172 | inner: udp_socket, 173 | src_addr: Arc::new(RwLock::new(None)), 174 | shutdown_rx, 175 | shutdown_tx, 176 | })) 177 | } 178 | }; 179 | } 180 | } 181 | -------------------------------------------------------------------------------- /src/protocol/socks5/mod.rs: -------------------------------------------------------------------------------- 1 | use crate::error::Error; 2 | use std::io; 3 | 4 | pub mod acceptor; 5 | 6 | use std::{fmt::Debug, u8, vec}; 7 | 8 | use bytes::{BufMut, BytesMut}; 9 | use tokio::io::{AsyncRead, AsyncReadExt, AsyncWrite, AsyncWriteExt}; 10 | 11 | use super::Address; 12 | 13 | const VERSION: u8 = 0x05; 14 | 15 | const AUTH_METHOD_NONE: u8 = 0x00; 16 | 17 | const CMD_TCP_CONNECT: u8 = 0x01; 18 | const CMD_UDP_ASSOCIATE: u8 = 0x03; 19 | 20 | const REPLY_SUCCEEDED: u8 = 0x00; 21 | 22 | fn new_error(message: T) -> io::Error { 23 | return Error::new(format!("socks: {}", message.to_string())).into(); 24 | } 25 | 26 | #[derive(Clone, Debug, Copy)] 27 | enum Command { 28 | /// CONNECT command (TCP tunnel) 29 | TcpConnect, 30 | /// UDP ASSOCIATE command 31 | UdpAssociate, 32 | } 33 | 34 | impl Command { 35 | #[inline] 36 | fn from_u8(code: u8) -> Option { 37 | match code { 38 | CMD_TCP_CONNECT => Some(Command::TcpConnect), 39 | CMD_UDP_ASSOCIATE => Some(Command::UdpAssociate), 40 | _ => None, 41 | } 42 | } 43 | } 44 | 45 | /// TCP request header after handshake 46 | /// 47 | /// ```plain 48 | /// +----+-----+-------+------+----------+----------+ 49 | /// |VER | CMD | RSV | ATYP | DST.ADDR | DST.PORT | 50 | /// +----+-----+-------+------+----------+----------+ 51 | /// | 1 | 1 | X'00' | 1 | Variable | 2 | 52 | /// +----+-----+-------+------+----------+----------+ 53 | /// ``` 54 | #[derive(Clone, Debug)] 55 | struct TcpRequestHeader { 56 | /// SOCKS5 command 57 | command: Command, 58 | /// Remote address 59 | address: Address, 60 | } 61 | 62 | impl TcpRequestHeader { 63 | /// Read from a reader 64 | async fn read_from(r: &mut R) -> io::Result 65 | where 66 | R: AsyncRead + Unpin, 67 | { 68 | let mut buf = [0u8; 3]; 69 | let _ = r.read_exact(&mut buf).await?; 70 | 71 | let ver = buf[0]; 72 | if ver != VERSION { 73 | return Err(new_error(format!("unsupported socks version {:#x}", ver))); 74 | } 75 | 76 | let cmd = buf[1]; 77 | let command = match Command::from_u8(cmd) { 78 | Some(c) => c, 79 | None => { 80 | return Err(new_error(format!("unsupported command {:#x}", cmd))); 81 | } 82 | }; 83 | 84 | let address = Address::read_from_stream(r).await?; 85 | Ok(TcpRequestHeader { command, address }) 86 | } 87 | } 88 | 89 | /// TCP response header 90 | /// 91 | /// ```plain 92 | /// +----+-----+-------+------+----------+----------+ 93 | /// |VER | REP | RSV | ATYP | BND.ADDR | BND.PORT | 94 | /// +----+-----+-------+------+----------+----------+ 95 | /// | 1 | 1 | X'00' | 1 | Variable | 2 | 96 | /// +----+-----+-------+------+----------+----------+ 97 | /// ``` 98 | #[derive(Clone, Debug)] 99 | struct TcpResponseHeader { 100 | /// Reply address 101 | address: Address, 102 | } 103 | 104 | impl TcpResponseHeader { 105 | /// Creates a response header 106 | fn new(address: Address) -> TcpResponseHeader { 107 | TcpResponseHeader { address } 108 | } 109 | 110 | /// Write to a writer 111 | async fn write_to(&self, w: &mut W) -> io::Result<()> 112 | where 113 | W: AsyncWrite + Unpin, 114 | { 115 | let mut buf = BytesMut::with_capacity(self.serialized_len()); 116 | self.write_to_buf(&mut buf); 117 | w.write(&buf).await?; 118 | Ok(()) 119 | } 120 | 121 | /// Writes to buffer 122 | fn write_to_buf(&self, buf: &mut B) { 123 | let TcpResponseHeader { ref address } = *self; 124 | buf.put_slice(&[VERSION, REPLY_SUCCEEDED, 0x00]); 125 | address.write_to_buf(buf); 126 | } 127 | 128 | /// Length in bytes 129 | #[inline] 130 | fn serialized_len(&self) -> usize { 131 | self.address.serialized_len() + 3 132 | } 133 | } 134 | 135 | /// SOCKS5 handshake request packet 136 | /// 137 | /// ```plain 138 | /// +----+----------+----------+ 139 | /// |VER | NMETHODS | METHODS | 140 | /// +----+----------+----------+ 141 | /// | 5 | 1 | 1 to 255 | 142 | /// +----+----------+----------| 143 | /// ``` 144 | #[derive(Clone, Debug)] 145 | struct HandshakeRequest { 146 | methods: Vec, 147 | } 148 | 149 | impl HandshakeRequest { 150 | /// Read from a reader 151 | async fn read_from(r: &mut R) -> io::Result 152 | where 153 | R: AsyncRead + Unpin, 154 | { 155 | let mut buf = [0u8; 2]; 156 | let _ = r.read_exact(&mut buf).await?; 157 | 158 | let ver = buf[0]; 159 | let nmet = buf[1]; 160 | 161 | if ver != VERSION { 162 | use std::io::{Error, ErrorKind}; 163 | let err = Error::new( 164 | ErrorKind::InvalidData, 165 | format!("unsupported socks version {:#x}", ver), 166 | ); 167 | return Err(err); 168 | } 169 | 170 | let mut methods = vec![0u8; nmet as usize]; 171 | let _ = r.read_exact(&mut methods).await?; 172 | 173 | Ok(HandshakeRequest { methods }) 174 | } 175 | } 176 | 177 | /// SOCKS5 handshake response packet 178 | /// 179 | /// ```plain 180 | /// +----+--------+ 181 | /// |VER | METHOD | 182 | /// +----+--------+ 183 | /// | 1 | 1 | 184 | /// +----+--------+ 185 | /// ``` 186 | #[derive(Clone, Debug, Copy)] 187 | struct HandshakeResponse { 188 | chosen_method: u8, 189 | } 190 | 191 | impl HandshakeResponse { 192 | /// Creates a handshake response 193 | fn new(cm: u8) -> HandshakeResponse { 194 | HandshakeResponse { chosen_method: cm } 195 | } 196 | 197 | /// Write to a writer 198 | async fn write_to(self, w: &mut W) -> io::Result<()> 199 | where 200 | W: AsyncWrite + Unpin, 201 | { 202 | let mut buf = BytesMut::with_capacity(self.serialized_len()); 203 | self.write_to_buf(&mut buf); 204 | w.write_all(&buf).await 205 | } 206 | 207 | /// Write to buffer 208 | fn write_to_buf(self, buf: &mut B) { 209 | buf.put_slice(&[VERSION, self.chosen_method]); 210 | } 211 | 212 | /// Length in bytes 213 | fn serialized_len(self) -> usize { 214 | 2 215 | } 216 | } 217 | 218 | /// UDP ASSOCIATE request header 219 | /// 220 | /// ```plain 221 | /// +----+------+------+----------+----------+----------+ 222 | /// |RSV | FRAG | ATYP | DST.ADDR | DST.PORT | DATA | 223 | /// +----+------+------+----------+----------+----------+ 224 | /// | 2 | 1 | 1 | Variable | 2 | Variable | 225 | /// +----+------+------+----------+----------+----------+ 226 | /// ``` 227 | #[derive(Clone, Debug)] 228 | struct UdpAssociateHeader { 229 | /// Fragment 230 | frag: u8, 231 | /// Remote address 232 | address: Address, 233 | } 234 | 235 | impl UdpAssociateHeader { 236 | /// Creates a header 237 | fn new(frag: u8, address: Address) -> UdpAssociateHeader { 238 | UdpAssociateHeader { frag, address } 239 | } 240 | 241 | fn read_from_buf(buf: &[u8]) -> io::Result { 242 | if buf.len() <= 3 { 243 | return Err(new_error("packet too short")); 244 | } 245 | let addr = Address::read_from_buf(&buf[3..])?; 246 | Ok(UdpAssociateHeader::new(0, addr)) 247 | } 248 | 249 | fn write_to_buf(&self, buf: &mut B) { 250 | buf.put_slice(&[0x00, 0x00, 0x00]); 251 | self.address.write_to_buf(buf); 252 | } 253 | 254 | /// Length in bytes 255 | #[inline] 256 | fn serialized_len(&self) -> usize { 257 | 3 + self.address.serialized_len() 258 | } 259 | } 260 | -------------------------------------------------------------------------------- /src/protocol/tls/acceptor.rs: -------------------------------------------------------------------------------- 1 | use crate::protocol::{ 2 | tls::{get_cipher_suite, load_cert, load_key, new_error}, 3 | AcceptResult, Address, DummyUdpStream, ProxyAcceptor, ProxyTcpStream, 4 | }; 5 | use async_trait::async_trait; 6 | use serde::Deserialize; 7 | use std::{io, path::Path, sync::Arc}; 8 | use tokio::net::{TcpListener, TcpStream}; 9 | use tokio_rustls::{ 10 | rustls::{NoClientAuth, ServerConfig}, 11 | server::TlsStream, 12 | TlsAcceptor, 13 | }; 14 | 15 | #[derive(Deserialize)] 16 | pub struct TrojanTlsAcceptorConfig { 17 | addr: String, 18 | cert: String, 19 | key: String, 20 | cipher: Option>, 21 | } 22 | 23 | pub struct TrojanTlsAcceptor { 24 | tls_acceptor: TlsAcceptor, 25 | tcp_listener: TcpListener, 26 | } 27 | 28 | impl ProxyTcpStream for TlsStream {} 29 | 30 | #[async_trait] 31 | impl ProxyAcceptor for TrojanTlsAcceptor { 32 | type TS = TlsStream; 33 | type US = DummyUdpStream; 34 | 35 | async fn accept(&self) -> io::Result> { 36 | let (stream, addr) = self.tcp_listener.accept().await?; 37 | log::info!("tcp connection from {}", addr); 38 | let stream = self.tls_acceptor.accept(stream).await?; 39 | Ok(AcceptResult::Tcp((stream, Address::SocketAddress(addr)))) 40 | } 41 | } 42 | 43 | impl TrojanTlsAcceptor { 44 | pub async fn new(config: &TrojanTlsAcceptorConfig) -> io::Result { 45 | let tcp_listener = TcpListener::bind(config.addr.to_owned()).await?; 46 | log::debug!("tls listen addr = {}", config.addr); 47 | 48 | let cert_path = Path::new(&config.cert); 49 | let key_path = Path::new(&config.key); 50 | let certs = load_cert(&cert_path)?; 51 | let mut keys = load_key(&key_path)?; 52 | 53 | let mut tls_config = ServerConfig::new(NoClientAuth::new()); 54 | tls_config 55 | .set_single_cert(certs, keys.remove(0)) 56 | .map_err(|e| new_error(format!("invalid cert {}", e.to_string())))?; 57 | 58 | tls_config.ciphersuites = get_cipher_suite(config.cipher.clone())?; 59 | 60 | let tls_acceptor = TlsAcceptor::from(Arc::new(tls_config)); 61 | Ok(Self { 62 | tcp_listener, 63 | tls_acceptor, 64 | }) 65 | } 66 | } 67 | -------------------------------------------------------------------------------- /src/protocol/tls/connector.rs: -------------------------------------------------------------------------------- 1 | use crate::protocol::{Address, DummyUdpStream, ProxyConnector, ProxyTcpStream}; 2 | use async_trait::async_trait; 3 | use serde::Deserialize; 4 | use std::{ 5 | fs::File, 6 | io::{self, BufReader}, 7 | path::Path, 8 | sync::Arc, 9 | }; 10 | use tokio::net::TcpStream; 11 | use tokio_rustls::{client::TlsStream, rustls::ClientConfig, TlsConnector}; 12 | use webpki::DNSNameRef; 13 | 14 | use super::get_cipher_suite; 15 | 16 | #[derive(Deserialize)] 17 | pub struct TrojanTlsConnectorConfig { 18 | addr: String, 19 | sni: String, 20 | cipher: Option>, 21 | cert: Option, 22 | } 23 | 24 | pub struct TrojanTlsConnector { 25 | sni: String, 26 | server_addr: String, 27 | tls_config: Arc, 28 | } 29 | 30 | impl ProxyTcpStream for TlsStream {} 31 | 32 | impl TrojanTlsConnector { 33 | pub fn new(config: &TrojanTlsConnectorConfig) -> io::Result { 34 | let mut tls_config = ClientConfig::new(); 35 | 36 | tls_config.ciphersuites = get_cipher_suite(config.cipher.clone())?; 37 | 38 | if let Some(ref cert_path) = config.cert { 39 | let cert_path = Path::new(cert_path); 40 | tls_config 41 | .root_store 42 | .add_pem_file(&mut BufReader::new(File::open(cert_path)?)) 43 | .unwrap(); 44 | } else { 45 | tls_config 46 | .root_store 47 | .add_server_trust_anchors(&webpki_roots::TLS_SERVER_ROOTS); 48 | } 49 | 50 | Ok(Self { 51 | sni: config.sni.clone(), 52 | server_addr: config.addr.clone(), 53 | tls_config: Arc::new(tls_config), 54 | }) 55 | } 56 | } 57 | 58 | #[async_trait] 59 | impl ProxyConnector for TrojanTlsConnector { 60 | type TS = TlsStream; 61 | type US = DummyUdpStream; 62 | 63 | async fn connect_tcp(&self, _: &Address) -> io::Result { 64 | let stream = TcpStream::connect(&self.server_addr).await?; 65 | stream.set_nodelay(true)?; 66 | 67 | let dns_name = DNSNameRef::try_from_ascii_str(&self.sni) 68 | .map_err(|e| io::Error::new(io::ErrorKind::NotFound, e.to_string()))?; 69 | let stream = TlsConnector::from(self.tls_config.clone()) 70 | .connect(dns_name, stream) 71 | .await?; 72 | 73 | log::info!("connected to {}", self.server_addr); 74 | Ok(stream) 75 | } 76 | 77 | async fn connect_udp(&self) -> io::Result { 78 | unimplemented!() 79 | } 80 | } 81 | -------------------------------------------------------------------------------- /src/protocol/tls/mod.rs: -------------------------------------------------------------------------------- 1 | use tokio_rustls::rustls::{ 2 | internal::pemfile, Certificate, CipherSuite, PrivateKey, SupportedCipherSuite, ALL_CIPHERSUITES, 3 | }; 4 | 5 | use crate::error::Error; 6 | use std::{ 7 | fs::File, 8 | io::{self, BufReader}, 9 | path::Path, 10 | }; 11 | 12 | pub mod acceptor; 13 | pub mod connector; 14 | 15 | fn new_error(message: T) -> io::Error { 16 | return Error::new(format!("tls: {}", message.to_string())).into(); 17 | } 18 | 19 | fn load_cert(path: &Path) -> io::Result> { 20 | pemfile::certs(&mut BufReader::new(File::open(path)?)) 21 | .map_err(|_| io::Error::new(io::ErrorKind::InvalidInput, "invalid tls cert")) 22 | } 23 | 24 | fn load_key(path: &Path) -> io::Result> { 25 | let pkcs8_key = pemfile::pkcs8_private_keys(&mut BufReader::new(File::open(path)?)) 26 | .map_err(|_| io::Error::new(io::ErrorKind::InvalidInput, "invalid tls pkcs8 key"))?; 27 | if pkcs8_key.len() != 0 { 28 | return Ok(pkcs8_key); 29 | } 30 | let rsa_key = pemfile::rsa_private_keys(&mut BufReader::new(File::open(path)?)) 31 | .map_err(|_| io::Error::new(io::ErrorKind::InvalidInput, "invalid tls rsa key"))?; 32 | if rsa_key.len() != 0 { 33 | return Ok(rsa_key); 34 | } 35 | return Err(new_error("no valid key found")); 36 | } 37 | 38 | fn get_cipher_name(cipher: &SupportedCipherSuite) -> &'static str { 39 | /* 40 | /// A list of all the cipher suites supported by rustls. 41 | pub static ALL_CIPHERSUITES: [&SupportedCipherSuite; 9] = [ 42 | // TLS1.3 suites 43 | &TLS13_CHACHA20_POLY1305_SHA256, 44 | &TLS13_AES_256_GCM_SHA384, 45 | &TLS13_AES_128_GCM_SHA256, 46 | 47 | // TLS1.2 suites 48 | &TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256, 49 | &TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256, 50 | &TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, 51 | &TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, 52 | &TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384, 53 | &TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 54 | ]; 55 | */ 56 | match cipher.suite { 57 | CipherSuite::TLS13_CHACHA20_POLY1305_SHA256 => "TLS13_CHACHA20_POLY1305_SHA256", 58 | CipherSuite::TLS13_AES_256_GCM_SHA384 => "TLS13_AES_256_GCM_SHA384", 59 | CipherSuite::TLS13_AES_128_GCM_SHA256 => "TLS13_AES_128_GCM_SHA256", 60 | CipherSuite::TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256 => { 61 | "TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256" 62 | } 63 | CipherSuite::TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256 => { 64 | "TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256" 65 | } 66 | CipherSuite::TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384 => { 67 | "TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384" 68 | } 69 | CipherSuite::TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 => { 70 | "TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256" 71 | } 72 | CipherSuite::TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 => { 73 | "TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384" 74 | } 75 | CipherSuite::TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 => { 76 | "TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256" 77 | } 78 | _ => "???", 79 | } 80 | } 81 | 82 | fn get_cipher_suite(cipher: Option>) -> io::Result> { 83 | if cipher.is_none() { 84 | return Ok(ALL_CIPHERSUITES.to_vec()); 85 | } 86 | let cipher = cipher.unwrap(); 87 | let mut result = Vec::new(); 88 | 89 | for name in cipher { 90 | let mut found = false; 91 | for i in ALL_CIPHERSUITES.to_vec() { 92 | if name == get_cipher_name(i) { 93 | result.push(i); 94 | found = true; 95 | log::debug!("cipher: {} applied", name); 96 | break; 97 | } 98 | } 99 | if !found { 100 | return Err(new_error(format!("bad cipher: {}", name))); 101 | } 102 | } 103 | Ok(result) 104 | } 105 | -------------------------------------------------------------------------------- /src/protocol/trojan/acceptor.rs: -------------------------------------------------------------------------------- 1 | use async_trait::async_trait; 2 | use bytes::Buf; 3 | use serde::Deserialize; 4 | use std::{io, str::FromStr}; 5 | use tokio::{io::AsyncWriteExt, net::TcpStream}; 6 | 7 | use crate::protocol::{trojan::RequestHeader, AcceptResult, Address, ProxyAcceptor}; 8 | use crate::proxy::relay_tcp; 9 | 10 | use super::{new_error, password_to_hash, TrojanUdpStream, HASH_STR_LEN}; 11 | 12 | #[derive(Deserialize)] 13 | pub struct TrojanAcceptorConfig { 14 | password: String, 15 | fallback_addr: String, 16 | } 17 | 18 | pub struct TrojanAcceptor { 19 | valid_hash: [u8; HASH_STR_LEN], 20 | fallback_addr: Address, 21 | inner: T, 22 | } 23 | 24 | #[async_trait] 25 | impl ProxyAcceptor for TrojanAcceptor { 26 | type TS = T::TS; 27 | type US = TrojanUdpStream; 28 | async fn accept(&self) -> io::Result> { 29 | let (mut stream, addr) = self.inner.accept().await?.unwrap_tcp_with_addr(); 30 | let mut first_packet = Vec::new(); 31 | match RequestHeader::read_from(&mut stream, &self.valid_hash, &mut first_packet).await { 32 | Ok(header) => match header { 33 | RequestHeader::TcpConnect(_, addr) => { 34 | log::info!("trojan tcp stream {}", addr); 35 | Ok(AcceptResult::Tcp((stream, addr))) 36 | } 37 | RequestHeader::UdpAssociate(_) => { 38 | log::info!("trojan udp stream {}", addr); 39 | Ok(AcceptResult::Udp(TrojanUdpStream::new(stream))) 40 | } 41 | }, 42 | Err(e) => { 43 | log::debug!("first packet {:x?}", first_packet); 44 | let fallback_addr = self.fallback_addr.clone(); 45 | log::warn!("invalid trojan request, falling back to {}", fallback_addr); 46 | tokio::spawn(async move { 47 | let inbound = stream; 48 | let mut outbound = TcpStream::connect(fallback_addr.to_string()).await.unwrap(); 49 | let _ = outbound.write(&first_packet).await; 50 | relay_tcp(inbound, outbound).await; 51 | }); 52 | Err(new_error(format!("invalid packet: {}", e.to_string()))) 53 | } 54 | } 55 | } 56 | } 57 | 58 | impl TrojanAcceptor { 59 | pub fn new(config: &TrojanAcceptorConfig, inner: T) -> io::Result { 60 | let fallback_addr = Address::from_str(&config.fallback_addr)?; 61 | let mut valid_hash = [0u8; HASH_STR_LEN]; 62 | password_to_hash(&config.password) 63 | .as_bytes() 64 | .copy_to_slice(&mut valid_hash); 65 | Ok(Self { 66 | fallback_addr, 67 | valid_hash, 68 | inner, 69 | }) 70 | } 71 | } 72 | -------------------------------------------------------------------------------- /src/protocol/trojan/connector.rs: -------------------------------------------------------------------------------- 1 | use async_trait::async_trait; 2 | use bytes::Buf; 3 | use serde::Deserialize; 4 | use std::io; 5 | 6 | use crate::protocol::{Address, ProxyConnector}; 7 | 8 | use super::{new_error, password_to_hash, RequestHeader, TrojanUdpStream, HASH_STR_LEN}; 9 | 10 | #[derive(Deserialize)] 11 | pub struct TrojanConnectorConfig { 12 | password: String, 13 | } 14 | 15 | pub struct TrojanConnector { 16 | inner: T, 17 | hash: [u8; HASH_STR_LEN], 18 | } 19 | 20 | impl TrojanConnector { 21 | pub fn new(config: &TrojanConnectorConfig, inner: T) -> io::Result { 22 | if config.password.len() < 1 { 23 | return Err(new_error("no valid password found")); 24 | } 25 | let mut hash = [0u8; HASH_STR_LEN]; 26 | password_to_hash(&config.password) 27 | .as_bytes() 28 | .copy_to_slice(&mut hash); 29 | Ok(Self { inner, hash }) 30 | } 31 | } 32 | 33 | #[async_trait] 34 | impl ProxyConnector for TrojanConnector { 35 | type TS = T::TS; 36 | type US = TrojanUdpStream; 37 | 38 | async fn connect_tcp(&self, addr: &Address) -> io::Result { 39 | let mut stream = self.inner.connect_tcp(addr).await?; 40 | let header = RequestHeader::TcpConnect(self.hash.clone(), addr.clone()); 41 | header.write_to(&mut stream).await?; 42 | Ok(stream) 43 | } 44 | 45 | async fn connect_udp(&self) -> io::Result { 46 | let udp_dummy_addr = Address::new_dummy_address(); 47 | let mut stream = self.inner.connect_tcp(&udp_dummy_addr).await?; 48 | let header = RequestHeader::UdpAssociate(self.hash.clone()); 49 | header.write_to(&mut stream).await?; 50 | Ok(TrojanUdpStream::new(stream)) 51 | } 52 | } 53 | -------------------------------------------------------------------------------- /src/protocol/trojan/mod.rs: -------------------------------------------------------------------------------- 1 | use crate::error::Error; 2 | use async_trait::async_trait; 3 | use bytes::BufMut; 4 | use sha2::{Digest, Sha224}; 5 | use std::{fmt::Write, io}; 6 | use tokio::io::{split, AsyncRead, AsyncReadExt, AsyncWrite, AsyncWriteExt, ReadHalf, WriteHalf}; 7 | 8 | use super::{Address, ProxyTcpStream, ProxyUdpStream, UdpRead, UdpWrite}; 9 | 10 | pub mod acceptor; 11 | pub mod connector; 12 | 13 | const HASH_STR_LEN: usize = 56; 14 | 15 | fn new_error(message: T) -> io::Error { 16 | return Error::new(format!("trojan: {}", message.to_string())).into(); 17 | } 18 | 19 | fn password_to_hash(s: T) -> String { 20 | let mut hasher = Sha224::new(); 21 | hasher.update(&s.to_string().into_bytes()); 22 | let h = hasher.finalize(); 23 | let mut s = String::with_capacity(HASH_STR_LEN); 24 | for i in h { 25 | write!(s, "{:02x}", i).unwrap(); 26 | } 27 | s 28 | } 29 | 30 | const CMD_TCP_CONNECT: u8 = 0x01; 31 | const CMD_UDP_ASSOCIATE: u8 = 0x03; 32 | 33 | /// ```plain 34 | /// +-----------------------+---------+----------------+---------+----------+ 35 | /// | hex(SHA224(password)) | CRLF | Trojan Request | CRLF | Payload | 36 | /// +-----------------------+---------+----------------+---------+----------+ 37 | /// | 56 | X'0D0A' | Variable | X'0D0A' | Variable | 38 | /// +-----------------------+---------+----------------+---------+----------+ 39 | /// 40 | /// where Trojan Request is a SOCKS5-like request: 41 | /// 42 | /// +-----+------+----------+----------+ 43 | /// | CMD | ATYP | DST.ADDR | DST.PORT | 44 | /// +-----+------+----------+----------+ 45 | /// | 1 | 1 | Variable | 2 | 46 | /// +-----+------+----------+----------+ 47 | /// 48 | /// where: 49 | /// 50 | /// o CMD 51 | /// o CONNECT X'01' 52 | /// o UDP ASSOCIATE X'03' 53 | /// o ATYP address type of following address 54 | /// o IP V4 address: X'01' 55 | /// o DOMAINNAME: X'03' 56 | /// o IP V6 address: X'04' 57 | /// o DST.ADDR desired destination address 58 | /// o DST.PORT desired destination port in network octet order 59 | /// ``` 60 | enum RequestHeader { 61 | TcpConnect([u8; HASH_STR_LEN], Address), 62 | UdpAssociate([u8; HASH_STR_LEN]), 63 | } 64 | 65 | impl RequestHeader { 66 | async fn read_from( 67 | stream: &mut R, 68 | valid_hash: &[u8], 69 | first_packet: &mut Vec, 70 | ) -> io::Result 71 | where 72 | R: AsyncRead + Unpin, 73 | { 74 | let mut hash_buf = [0u8; HASH_STR_LEN]; 75 | let len = stream.read(&mut hash_buf).await?; 76 | if len != HASH_STR_LEN { 77 | first_packet.extend_from_slice(&hash_buf[..len]); 78 | return Err(new_error("first packet too short")); 79 | } 80 | 81 | if valid_hash != hash_buf { 82 | first_packet.extend_from_slice(&hash_buf); 83 | return Err(new_error(format!( 84 | "invalid password hash: {}", 85 | String::from_utf8_lossy(&hash_buf) 86 | ))); 87 | } 88 | 89 | let mut crlf_buf = [0u8; 2]; 90 | let mut cmd_buf = [0u8; 1]; 91 | 92 | stream.read_exact(&mut crlf_buf).await?; 93 | stream.read_exact(&mut cmd_buf).await?; 94 | let addr = Address::read_from_stream(stream).await?; 95 | stream.read_exact(&mut crlf_buf).await?; 96 | 97 | match cmd_buf[0] { 98 | CMD_TCP_CONNECT => Ok(Self::TcpConnect(hash_buf, addr)), 99 | CMD_UDP_ASSOCIATE => Ok(Self::UdpAssociate(hash_buf)), 100 | _ => Err(new_error("invalid command")), 101 | } 102 | } 103 | 104 | async fn write_to(&self, w: &mut W) -> io::Result<()> 105 | where 106 | W: AsyncWrite + Unpin, 107 | { 108 | let udp_dummy_addr = Address::new_dummy_address(); 109 | let (hash, addr, cmd) = match self { 110 | RequestHeader::TcpConnect(hash, addr) => (hash, addr, CMD_TCP_CONNECT), 111 | RequestHeader::UdpAssociate(hash) => (hash, &udp_dummy_addr, CMD_UDP_ASSOCIATE), 112 | }; 113 | 114 | let header_len = HASH_STR_LEN + 2 + 1 + addr.serialized_len() + 2; 115 | let mut buf = Vec::with_capacity(header_len); 116 | 117 | let cursor = &mut buf; 118 | let crlf = b"\r\n"; 119 | cursor.put_slice(hash); 120 | cursor.put_slice(crlf); 121 | cursor.put_u8(cmd); 122 | addr.write_to_buf(cursor); 123 | cursor.put_slice(crlf); 124 | 125 | w.write(&buf).await?; 126 | Ok(()) 127 | } 128 | } 129 | 130 | /// ```plain 131 | /// +------+----------+----------+--------+---------+----------+ 132 | /// | ATYP | DST.ADDR | DST.PORT | Length | CRLF | Payload | 133 | /// +------+----------+----------+--------+---------+----------+ 134 | /// | 1 | Variable | 2 | 2 | X'0D0A' | Variable | 135 | /// +------+----------+----------+--------+---------+----------+ 136 | /// ``` 137 | pub struct UdpHeader { 138 | pub address: Address, 139 | pub payload_len: u16, 140 | } 141 | 142 | impl UdpHeader { 143 | #[inline] 144 | pub fn new(addr: &Address, payload_len: usize) -> Self { 145 | Self { 146 | address: addr.clone(), 147 | payload_len: payload_len as u16, 148 | } 149 | } 150 | 151 | pub async fn read_from(stream: &mut R) -> io::Result 152 | where 153 | R: AsyncRead + Unpin, 154 | { 155 | let addr = Address::read_from_stream(stream).await?; 156 | let mut buf = [0u8; 2]; 157 | stream.read_exact(&mut buf).await?; 158 | let len = ((buf[0] as u16) << 8) | (buf[1] as u16); 159 | stream.read_exact(&mut buf).await?; 160 | log::debug!("udp addr={} len={}", addr, len); 161 | Ok(Self { 162 | address: addr, 163 | payload_len: len, 164 | }) 165 | } 166 | 167 | pub async fn write_to(&self, w: &mut W) -> io::Result<()> 168 | where 169 | W: AsyncWrite + Unpin, 170 | { 171 | let mut buf = Vec::with_capacity(self.address.serialized_len() + 2 + 1); 172 | let cursor = &mut buf; 173 | self.address.write_to_buf(cursor); 174 | cursor.put_u16(self.payload_len); 175 | cursor.put_slice(b"\r\n"); 176 | w.write(&buf).await?; 177 | Ok(()) 178 | } 179 | } 180 | 181 | pub struct TrojanUdpReader { 182 | inner: T, 183 | } 184 | 185 | #[async_trait] 186 | impl UdpRead for TrojanUdpReader { 187 | async fn read_from(&mut self, buf: &mut [u8]) -> io::Result<(usize, Address)> { 188 | let header = UdpHeader::read_from(&mut self.inner).await?; 189 | self.inner 190 | .read_exact(&mut buf[..header.payload_len as usize]) 191 | .await?; 192 | Ok((header.payload_len as usize, header.address)) 193 | } 194 | } 195 | 196 | pub struct TrojanUdpWriter { 197 | inner: T, 198 | } 199 | 200 | #[async_trait] 201 | impl UdpWrite for TrojanUdpWriter { 202 | async fn write_to(&mut self, buf: &[u8], addr: &Address) -> io::Result<()> { 203 | let header = UdpHeader::new(addr, buf.len()); 204 | header.write_to(&mut self.inner).await?; 205 | self.inner.write(buf).await?; 206 | Ok(()) 207 | } 208 | } 209 | 210 | pub struct TrojanUdpStream { 211 | reader: TrojanUdpReader>, 212 | writer: TrojanUdpWriter>, 213 | } 214 | 215 | impl TrojanUdpStream { 216 | pub fn new(inner: T) -> Self { 217 | let (reader, writer) = split(inner); 218 | let reader = TrojanUdpReader { inner: reader }; 219 | let writer = TrojanUdpWriter { inner: writer }; 220 | Self { reader, writer } 221 | } 222 | } 223 | 224 | #[async_trait] 225 | impl ProxyUdpStream for TrojanUdpStream { 226 | type R = TrojanUdpReader>; 227 | type W = TrojanUdpWriter>; 228 | 229 | fn split(self) -> (Self::R, Self::W) { 230 | (self.reader, self.writer) 231 | } 232 | 233 | fn reunite(r: Self::R, w: Self::W) -> Self { 234 | Self { 235 | reader: r, 236 | writer: w, 237 | } 238 | } 239 | 240 | async fn close(self) -> io::Result<()> { 241 | let mut inner = self.reader.inner.unsplit(self.writer.inner); 242 | inner.shutdown().await?; 243 | Ok(()) 244 | } 245 | } 246 | -------------------------------------------------------------------------------- /src/protocol/websocket/acceptor.rs: -------------------------------------------------------------------------------- 1 | use super::{new_error, BinaryWsStream}; 2 | use crate::protocol::{AcceptResult, DummyUdpStream, ProxyAcceptor}; 3 | use async_trait::async_trait; 4 | use log::error; 5 | use serde::Deserialize; 6 | use std::io; 7 | use tokio_tungstenite::{ 8 | accept_hdr_async_with_config, 9 | tungstenite::{ 10 | handshake::server::{Callback, ErrorResponse, Request, Response}, 11 | http::StatusCode, 12 | }, 13 | }; 14 | 15 | #[derive(Deserialize)] 16 | pub struct WebSocketAcceptorConfig { 17 | path: String, 18 | } 19 | 20 | struct WebSocketCallback { 21 | path: String, 22 | } 23 | 24 | impl Callback for WebSocketCallback { 25 | fn on_request(self, request: &Request, response: Response) -> Result { 26 | if request.uri().to_string() != self.path { 27 | let mut resp = ErrorResponse::new(None); 28 | *resp.status_mut() = StatusCode::NOT_FOUND; 29 | error!( 30 | "invalid websocket path: {}, expected: {}", 31 | request.uri(), 32 | self.path 33 | ); 34 | Err(resp) 35 | } else { 36 | Ok(response) 37 | } 38 | } 39 | } 40 | 41 | pub struct WebSocketAcceptor { 42 | path: String, 43 | inner: T, 44 | } 45 | 46 | #[async_trait] 47 | impl ProxyAcceptor for WebSocketAcceptor { 48 | type TS = BinaryWsStream; 49 | type US = DummyUdpStream; 50 | 51 | async fn accept(&self) -> io::Result> { 52 | let (stream, addr) = self.inner.accept().await?.unwrap_tcp_with_addr(); 53 | let stream = accept_hdr_async_with_config( 54 | stream, 55 | WebSocketCallback { 56 | path: self.path.clone(), 57 | }, 58 | None, 59 | ) 60 | .await 61 | .map_err(|e| new_error(e))?; 62 | let stream = BinaryWsStream::new(stream); 63 | Ok(AcceptResult::Tcp((stream, addr))) 64 | } 65 | } 66 | 67 | impl WebSocketAcceptor { 68 | pub fn new(config: &WebSocketAcceptorConfig, inner: T) -> io::Result { 69 | Ok(Self { 70 | inner, 71 | path: config.path.clone(), 72 | }) 73 | } 74 | } 75 | -------------------------------------------------------------------------------- /src/protocol/websocket/connector.rs: -------------------------------------------------------------------------------- 1 | use super::{new_error, BinaryWsStream}; 2 | use crate::protocol::{DummyUdpStream, ProxyConnector}; 3 | use async_trait::async_trait; 4 | use serde::Deserialize; 5 | use std::io; 6 | use tokio_tungstenite::{ 7 | client_async, 8 | tungstenite::http::{StatusCode, Uri}, 9 | }; 10 | 11 | #[derive(Deserialize)] 12 | pub struct WebSocketConnectorConfig { 13 | uri: String, 14 | } 15 | 16 | pub struct WebSocketConnector { 17 | uri: Uri, 18 | inner: T, 19 | } 20 | 21 | #[async_trait] 22 | impl ProxyConnector for WebSocketConnector { 23 | type TS = BinaryWsStream; 24 | type US = DummyUdpStream; 25 | 26 | async fn connect_tcp(&self, addr: &crate::protocol::Address) -> io::Result { 27 | let stream = self.inner.connect_tcp(addr).await?; 28 | let (stream, resp) = client_async(&self.uri, stream) 29 | .await 30 | .map_err(|e| new_error(e))?; 31 | if resp.status() != StatusCode::SWITCHING_PROTOCOLS { 32 | return Err(new_error(format!("bad status: {}", resp.status()))); 33 | } 34 | let stream = BinaryWsStream::new(stream); 35 | Ok(stream) 36 | } 37 | 38 | async fn connect_udp(&self) -> io::Result { 39 | unimplemented!() 40 | } 41 | } 42 | 43 | impl WebSocketConnector { 44 | pub fn new(config: &WebSocketConnectorConfig, inner: T) -> io::Result { 45 | let uri = config.uri.parse().map_err(|e| new_error(e))?; 46 | Ok(Self { inner, uri }) 47 | } 48 | } 49 | -------------------------------------------------------------------------------- /src/protocol/websocket/mod.rs: -------------------------------------------------------------------------------- 1 | pub mod acceptor; 2 | pub mod connector; 3 | 4 | use bytes::{Buf, Bytes}; 5 | use tokio::io::{AsyncRead, AsyncWrite}; 6 | use tokio_tungstenite::{tungstenite::Message, WebSocketStream}; 7 | 8 | use crate::error::Error; 9 | use futures_core::{ready, Stream}; 10 | use futures_util::sink::Sink; 11 | use std::{ 12 | io, 13 | pin::Pin, 14 | task::{Context, Poll}, 15 | }; 16 | 17 | use super::ProxyTcpStream; 18 | 19 | fn new_error(message: T) -> io::Error { 20 | return Error::new(format!("websocket: {}", message.to_string())).into(); 21 | } 22 | 23 | pub struct BinaryWsStream { 24 | inner: WebSocketStream, 25 | read_buffer: Option, 26 | } 27 | 28 | impl ProxyTcpStream for BinaryWsStream {} 29 | 30 | impl AsyncRead for BinaryWsStream { 31 | fn poll_read( 32 | mut self: Pin<&mut Self>, 33 | cx: &mut Context<'_>, 34 | buf: &mut tokio::io::ReadBuf<'_>, 35 | ) -> Poll> { 36 | loop { 37 | if let Some(read_buffer) = &mut self.read_buffer { 38 | if read_buffer.len() <= buf.remaining() { 39 | buf.put_slice(read_buffer); 40 | self.read_buffer = None; 41 | } else { 42 | let len = buf.remaining(); 43 | buf.put_slice(&read_buffer[..len]); 44 | read_buffer.advance(len); 45 | } 46 | return Poll::Ready(Ok(())); 47 | } 48 | let message = ready!(Pin::new(&mut self.inner).poll_next(cx)); 49 | if message.is_none() { 50 | return Poll::Ready(Err(new_error("websocket stream drained"))); 51 | } 52 | let message = message.unwrap().map_err(|e| new_error(e))?; 53 | // binary only 54 | match message { 55 | Message::Binary(binary) => { 56 | if binary.len() < buf.remaining() { 57 | buf.put_slice(&binary); 58 | return Poll::Ready(Ok(())); 59 | } else { 60 | self.read_buffer = Some(Bytes::from(binary)); 61 | continue; 62 | } 63 | } 64 | Message::Close(_) => { 65 | return Poll::Ready(Err(io::ErrorKind::ConnectionAborted.into())); 66 | } 67 | _ => { 68 | return Poll::Ready(Err(new_error(format!( 69 | "invalid message type {:?}", 70 | message 71 | )))) 72 | } 73 | } 74 | } 75 | } 76 | } 77 | 78 | impl AsyncWrite for BinaryWsStream { 79 | fn poll_write( 80 | mut self: Pin<&mut Self>, 81 | cx: &mut Context<'_>, 82 | buf: &[u8], 83 | ) -> Poll> { 84 | ready!(Pin::new(&mut self.inner).poll_ready(cx)) 85 | .map_err(|e| io::Error::new(io::ErrorKind::Other, format!("{:?}", e)))?; 86 | let message = Message::Binary(buf.into()); 87 | Pin::new(&mut self.inner) 88 | .start_send(message) 89 | .map_err(|e| io::Error::new(io::ErrorKind::Other, format!("{:?}", e)))?; 90 | Poll::Ready(Ok(buf.len())) 91 | } 92 | 93 | fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { 94 | let inner = Pin::new(&mut self.inner); 95 | inner 96 | .poll_flush(cx) 97 | .map_err(|e| io::Error::new(io::ErrorKind::Other, format!("{:?}", e))) 98 | } 99 | 100 | fn poll_shutdown( 101 | mut self: Pin<&mut Self>, 102 | cx: &mut Context<'_>, 103 | ) -> Poll> { 104 | ready!(Pin::new(&mut self.inner).poll_ready(cx)) 105 | .map_err(|e| io::Error::new(io::ErrorKind::Other, format!("{:?}", e)))?; 106 | let message = Message::Close(None); 107 | let _ = Pin::new(&mut self.inner).start_send(message); 108 | 109 | let inner = Pin::new(&mut self.inner); 110 | inner 111 | .poll_close(cx) 112 | .map_err(|e| io::Error::new(io::ErrorKind::Other, format!("{:?}", e))) 113 | } 114 | } 115 | 116 | impl BinaryWsStream { 117 | pub fn new(inner: WebSocketStream) -> Self { 118 | return Self { 119 | inner, 120 | read_buffer: None, 121 | }; 122 | } 123 | } 124 | -------------------------------------------------------------------------------- /src/proxy/mod.rs: -------------------------------------------------------------------------------- 1 | use std::{ 2 | fs::File, 3 | io::{self, Read}, 4 | sync::Arc, 5 | }; 6 | 7 | use log::LevelFilter; 8 | use serde::Deserialize; 9 | use tokio::io::{split, AsyncRead, AsyncReadExt, AsyncWrite, AsyncWriteExt}; 10 | 11 | use crate::{ 12 | error::Error, 13 | protocol::{ 14 | direct::connector::DirectConnector, 15 | dokodemo::acceptor::{DokodemoAcceptor, DokodemoAcceptorConfig}, 16 | mux::{ 17 | acceptor::{MuxAcceptor, MuxAcceptorConfig}, 18 | connector::{MuxConnector, MuxConnectorConfig}, 19 | }, 20 | plaintext::acceptor::{PlaintextAcceptor, PlaintextAcceptorConfig}, 21 | socks5::acceptor::{Socks5Acceptor, Socks5AcceptorConfig}, 22 | tls::{ 23 | acceptor::{TrojanTlsAcceptor, TrojanTlsAcceptorConfig}, 24 | connector::{TrojanTlsConnector, TrojanTlsConnectorConfig}, 25 | }, 26 | trojan::{ 27 | acceptor::{TrojanAcceptor, TrojanAcceptorConfig}, 28 | connector::{TrojanConnector, TrojanConnectorConfig}, 29 | }, 30 | websocket::{ 31 | acceptor::{WebSocketAcceptor, WebSocketAcceptorConfig}, 32 | connector::{WebSocketConnector, WebSocketConnectorConfig}, 33 | }, 34 | AcceptResult, ProxyAcceptor, ProxyConnector, ProxyTcpStream, ProxyUdpStream, UdpRead, 35 | UdpWrite, 36 | }, 37 | }; 38 | 39 | const RELAY_BUFFER_SIZE: usize = 0x4000; 40 | 41 | async fn copy_udp(r: &mut R, w: &mut W) -> io::Result<()> { 42 | let mut buf = [0u8; RELAY_BUFFER_SIZE]; 43 | loop { 44 | let (len, addr) = r.read_from(&mut buf).await?; 45 | log::debug!("udp packet addr={} len={}", addr, len); 46 | if len == 0 { 47 | break; 48 | } 49 | w.write_to(&buf[..len], &addr).await?; 50 | } 51 | Ok(()) 52 | } 53 | 54 | async fn copy_tcp( 55 | r: &mut R, 56 | w: &mut W, 57 | ) -> io::Result<()> { 58 | let mut buf = [0u8; RELAY_BUFFER_SIZE]; 59 | loop { 60 | let len = r.read(&mut buf).await?; 61 | if len == 0 { 62 | break; 63 | } 64 | w.write(&buf[..len]).await?; 65 | w.flush().await?; 66 | } 67 | Ok(()) 68 | } 69 | 70 | pub async fn relay_udp(a: T, b: U) { 71 | let (mut a_rx, mut a_tx) = a.split(); 72 | let (mut b_rx, mut b_tx) = b.split(); 73 | let t1 = copy_udp(&mut a_rx, &mut b_tx); 74 | let t2 = copy_udp(&mut b_rx, &mut a_tx); 75 | let e = tokio::select! { 76 | e = t1 => {e} 77 | e = t2 => {e} 78 | }; 79 | if let Err(e) = e { 80 | log::debug!("udp_relay err: {}", e) 81 | } 82 | let _ = T::reunite(a_rx, a_tx).close().await; 83 | let _ = U::reunite(b_rx, b_tx).close().await; 84 | log::info!("udp session ends"); 85 | } 86 | 87 | pub async fn relay_tcp(a: T, b: U) { 88 | let (mut a_rx, mut a_tx) = split(a); 89 | let (mut b_rx, mut b_tx) = split(b); 90 | let t1 = copy_tcp(&mut a_rx, &mut b_tx); 91 | let t2 = copy_tcp(&mut b_rx, &mut a_tx); 92 | let e = tokio::select! { 93 | e = t1 => {e} 94 | e = t2 => {e} 95 | }; 96 | if let Err(e) = e { 97 | log::debug!("relay_tcp err: {}", e) 98 | } 99 | let mut a = a_rx.unsplit(a_tx); 100 | let mut b = b_rx.unsplit(b_tx); 101 | let _ = a.shutdown().await; 102 | let _ = b.shutdown().await; 103 | log::info!("tcp session ends"); 104 | } 105 | 106 | #[derive(Deserialize)] 107 | struct GlobalConfig { 108 | mode: String, 109 | log_level: Option, 110 | } 111 | 112 | #[derive(Deserialize)] 113 | struct ClientConfig { 114 | socks5: Socks5AcceptorConfig, 115 | trojan: TrojanConnectorConfig, 116 | tls: TrojanTlsConnectorConfig, 117 | websocket: Option, 118 | mux: Option, 119 | } 120 | 121 | #[derive(Deserialize)] 122 | struct ServerConfig { 123 | trojan: TrojanAcceptorConfig, 124 | tls: Option, 125 | plaintext: Option, 126 | websocket: Option, 127 | mux: Option, 128 | } 129 | 130 | #[derive(Deserialize)] 131 | struct ForwardConfig { 132 | dokodemo: DokodemoAcceptorConfig, 133 | trojan: TrojanConnectorConfig, 134 | tls: TrojanTlsConnectorConfig, 135 | websocket: Option, 136 | mux: Option, 137 | } 138 | 139 | async fn run_proxy( 140 | acceptor: I, 141 | connector: O, 142 | ) -> io::Result<()> { 143 | let connector = Arc::new(connector); 144 | loop { 145 | match acceptor.accept().await { 146 | Ok(AcceptResult::Tcp((inbound, addr))) => { 147 | let connector = connector.clone(); 148 | tokio::spawn(async move { 149 | match connector.connect_tcp(&addr).await { 150 | Ok(outbound) => { 151 | log::info!("relaying tcp stream to {}", addr); 152 | relay_tcp(inbound, outbound).await; 153 | } 154 | Err(e) => { 155 | log::error!("failed to relay tcp stream to {}: {}", addr, e); 156 | } 157 | } 158 | }); 159 | } 160 | Ok(AcceptResult::Udp(inbound)) => { 161 | let connector = connector.clone(); 162 | tokio::spawn(async move { 163 | match connector.connect_udp().await { 164 | Ok(outbound) => { 165 | log::info!("relaying udp stream.."); 166 | relay_udp(inbound, outbound).await; 167 | } 168 | Err(e) => { 169 | log::error!("failed to relay tcp stream: {}", e.to_string()); 170 | } 171 | } 172 | }); 173 | } 174 | Err(e) => { 175 | log::error!("accept failed: {}", e); 176 | } 177 | } 178 | } 179 | } 180 | 181 | pub async fn launch_from_config_filename(filename: String) -> io::Result<()> { 182 | let mut file = File::open(filename)?; 183 | let mut config_string = String::new(); 184 | file.read_to_string(&mut config_string)?; 185 | launch_from_config_string(config_string).await 186 | } 187 | 188 | pub async fn launch_from_config_string(config_string: String) -> io::Result<()> { 189 | let config: GlobalConfig = toml::from_str(&config_string)?; 190 | if let Some(log_level) = config.log_level { 191 | let level = match log_level.as_str() { 192 | "trace" => LevelFilter::Trace, 193 | "debug" => LevelFilter::Debug, 194 | "info" => LevelFilter::Info, 195 | "warn" => LevelFilter::Warn, 196 | "error" => LevelFilter::Error, 197 | _ => { 198 | return Err(Error::new("invalid log_level").into()); 199 | } 200 | }; 201 | let _ = env_logger::builder().filter_level(level).try_init(); 202 | } else { 203 | let _ = env_logger::builder() 204 | .filter_level(LevelFilter::Debug) 205 | .try_init(); 206 | } 207 | match config.mode.as_str() { 208 | #[cfg(feature = "server")] 209 | "server" => { 210 | log::debug!("server mode"); 211 | let config: ServerConfig = toml::from_str(&config_string)?; 212 | let direct_connector = DirectConnector {}; 213 | if config.tls.is_none() { 214 | if config.plaintext.is_none() { 215 | return Err(Error::new("plaintext/tls section not found").into()); 216 | } 217 | let direct_acceptor = PlaintextAcceptor::new(&config.plaintext.unwrap()).await?; 218 | if config.websocket.is_none() { 219 | let trojan_acceptor = TrojanAcceptor::new(&config.trojan, direct_acceptor)?; 220 | if config.mux.is_none() { 221 | run_proxy(trojan_acceptor, direct_connector).await?; 222 | } else { 223 | let mux_acceptor = MuxAcceptor::new(trojan_acceptor, &config.mux.unwrap())?; 224 | run_proxy(mux_acceptor, direct_connector).await?; 225 | } 226 | } else { 227 | let ws_acceptor = 228 | WebSocketAcceptor::new(&config.websocket.unwrap(), direct_acceptor)?; 229 | let trojan_acceptor = TrojanAcceptor::new(&config.trojan, ws_acceptor)?; 230 | if config.mux.is_none() { 231 | run_proxy(trojan_acceptor, direct_connector).await?; 232 | } else { 233 | let mux_acceptor = MuxAcceptor::new(trojan_acceptor, &config.mux.unwrap())?; 234 | run_proxy(mux_acceptor, direct_connector).await?; 235 | } 236 | } 237 | } else { 238 | let tls_acceptor = TrojanTlsAcceptor::new(&config.tls.unwrap()).await?; 239 | if config.websocket.is_none() { 240 | let trojan_acceptor = TrojanAcceptor::new(&config.trojan, tls_acceptor)?; 241 | if config.mux.is_none() { 242 | run_proxy(trojan_acceptor, direct_connector).await?; 243 | } else { 244 | let mux_acceptor = MuxAcceptor::new(trojan_acceptor, &config.mux.unwrap())?; 245 | run_proxy(mux_acceptor, direct_connector).await?; 246 | } 247 | } else { 248 | let ws_acceptor = 249 | WebSocketAcceptor::new(&config.websocket.unwrap(), tls_acceptor)?; 250 | let trojan_acceptor = TrojanAcceptor::new(&config.trojan, ws_acceptor)?; 251 | if config.mux.is_none() { 252 | run_proxy(trojan_acceptor, direct_connector).await?; 253 | } else { 254 | let mux_acceptor = MuxAcceptor::new(trojan_acceptor, &config.mux.unwrap())?; 255 | run_proxy(mux_acceptor, direct_connector).await?; 256 | } 257 | } 258 | } 259 | } 260 | #[cfg(feature = "client")] 261 | "client" => { 262 | log::debug!("client mode"); 263 | let config: ClientConfig = toml::from_str(&config_string)?; 264 | let socks5_acceptor = Socks5Acceptor::new(&config.socks5).await?; 265 | let tls_connector = TrojanTlsConnector::new(&config.tls)?; 266 | if config.websocket.is_none() { 267 | let trojan_connector = TrojanConnector::new(&config.trojan, tls_connector)?; 268 | if config.mux.is_none() { 269 | run_proxy(socks5_acceptor, trojan_connector).await?; 270 | } else { 271 | let mux_connector = 272 | MuxConnector::new(&config.mux.unwrap(), trojan_connector).unwrap(); 273 | run_proxy(socks5_acceptor, mux_connector).await?; 274 | } 275 | } else { 276 | let ws_connector = 277 | WebSocketConnector::new(&config.websocket.unwrap(), tls_connector)?; 278 | let trojan_connector = TrojanConnector::new(&config.trojan, ws_connector)?; 279 | if config.mux.is_none() { 280 | run_proxy(socks5_acceptor, trojan_connector).await?; 281 | } else { 282 | let mux_connector = 283 | MuxConnector::new(&config.mux.unwrap(), trojan_connector).unwrap(); 284 | run_proxy(socks5_acceptor, mux_connector).await?; 285 | } 286 | } 287 | } 288 | #[cfg(feature = "forward")] 289 | "forward" => { 290 | log::debug!("forward mode"); 291 | let config: ForwardConfig = toml::from_str(&config_string)?; 292 | let dokodemo_acceptor = DokodemoAcceptor::new(&config.dokodemo).await?; 293 | let tls_connector = TrojanTlsConnector::new(&config.tls)?; 294 | if config.websocket.is_none() { 295 | let trojan_connector = TrojanConnector::new(&config.trojan, tls_connector)?; 296 | if config.mux.is_none() { 297 | run_proxy(dokodemo_acceptor, trojan_connector).await?; 298 | } else { 299 | let mux_connector = 300 | MuxConnector::new(&config.mux.unwrap(), trojan_connector).unwrap(); 301 | run_proxy(dokodemo_acceptor, mux_connector).await?; 302 | } 303 | } else { 304 | let ws_connector = 305 | WebSocketConnector::new(&config.websocket.unwrap(), tls_connector)?; 306 | let trojan_connector = TrojanConnector::new(&config.trojan, ws_connector)?; 307 | if config.mux.is_none() { 308 | run_proxy(dokodemo_acceptor, trojan_connector).await?; 309 | } else { 310 | let mux_connector = 311 | MuxConnector::new(&config.mux.unwrap(), trojan_connector).unwrap(); 312 | run_proxy(dokodemo_acceptor, mux_connector).await?; 313 | } 314 | } 315 | } 316 | _ => { 317 | log::error!("invalid mode: {}", config.mode.as_str()); 318 | } 319 | } 320 | Ok(()) 321 | } 322 | --------------------------------------------------------------------------------