131 lines
4.1 KiB
Rust
131 lines
4.1 KiB
Rust
use crate::config::Upstream;
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use crate::servers::protocol::tls::get_sni;
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use crate::servers::Proxy;
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use futures::future::try_join;
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use log::{debug, error, warn};
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use std::sync::Arc;
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use tokio::io;
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use tokio::io::{AsyncRead, AsyncWrite, AsyncWriteExt};
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use tokio::net::{TcpListener, TcpStream};
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pub async fn proxy(config: Arc<Proxy>) -> Result<(), Box<dyn std::error::Error>> {
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let listener = TcpListener::bind(config.listen).await?;
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let config = config.clone();
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loop {
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let thread_proxy = config.clone();
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match listener.accept().await {
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Err(err) => {
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error!("Failed to accept connection: {}", err);
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return Err(Box::new(err));
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}
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Ok((stream, _)) => {
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tokio::spawn(async move {
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match accept(stream, thread_proxy).await {
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Ok(_) => {}
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Err(err) => {
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error!("Relay thread returned an error: {}", err);
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}
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};
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});
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}
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}
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}
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}
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async fn accept(inbound: TcpStream, proxy: Arc<Proxy>) -> Result<(), Box<dyn std::error::Error>> {
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debug!("New connection from {:?}", inbound.peer_addr()?);
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let upstream_name = match proxy.tls {
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false => proxy.default.clone(),
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true => {
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let mut hello_buf = [0u8; 1024];
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inbound.peek(&mut hello_buf).await?;
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let snis = get_sni(&hello_buf);
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if snis.is_empty() {
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proxy.default.clone()
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} else {
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match proxy.sni.clone() {
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Some(sni_map) => {
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let mut upstream = proxy.default.clone();
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for sni in snis {
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let m = sni_map.get(&sni);
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if m.is_some() {
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upstream = m.unwrap().clone();
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break;
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}
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}
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upstream
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}
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None => proxy.default.clone(),
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}
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}
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}
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};
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debug!("Upstream: {}", upstream_name);
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let upstream = match proxy.upstream.get(&upstream_name) {
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Some(upstream) => upstream,
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None => {
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warn!(
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"No upstream named {:?} on server {:?}",
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proxy.default, proxy.name
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);
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return process(inbound, proxy.upstream.get(&proxy.default).unwrap()).await;
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// ToDo: Remove unwrap and check default option
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}
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};
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return process(inbound, upstream).await;
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}
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async fn process(
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mut inbound: TcpStream,
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upstream: &Upstream,
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) -> Result<(), Box<dyn std::error::Error>> {
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match upstream {
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Upstream::Ban => {
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let _ = inbound.shutdown();
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}
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Upstream::Echo => {
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let (mut ri, mut wi) = io::split(inbound);
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let inbound_to_inbound = copy(&mut ri, &mut wi);
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let bytes_tx = inbound_to_inbound.await;
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debug!("Bytes read: {:?}", bytes_tx);
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}
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Upstream::Custom(custom) => {
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match custom.protocol.as_ref() {
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"tcp" => {
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let outbound = TcpStream::connect(custom.addr.clone()).await?;
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let (mut ri, mut wi) = io::split(inbound);
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let (mut ro, mut wo) = io::split(outbound);
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let inbound_to_outbound = copy(&mut ri, &mut wo);
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let outbound_to_inbound = copy(&mut ro, &mut wi);
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let (bytes_tx, bytes_rx) = try_join(inbound_to_outbound, outbound_to_inbound).await?;
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debug!("Bytes read: {:?} write: {:?}", bytes_tx, bytes_rx);
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}
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_ => {}
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}
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}
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};
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Ok(())
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}
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async fn copy<'a, R, W>(reader: &'a mut R, writer: &'a mut W) -> io::Result<u64>
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where
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R: AsyncRead + Unpin + ?Sized,
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W: AsyncWrite + Unpin + ?Sized,
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{
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match io::copy(reader, writer).await {
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Ok(u64) => {
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let _ = writer.shutdown().await;
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Ok(u64)
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}
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Err(_) => Ok(0),
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}
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}
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