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use tokio::io; use tokio::io::AsyncWriteExt; use tokio::net::{TcpListener, TcpStream}; use futures::FutureExt; use serde::Deserialize; use std::net::SocketAddr; #[derive(Deserialize)] pub struct SocketConfig { pub server_addr: String, pub to_addr: String, } pub enum ValidateType { Normal, Warning, Forbidden, } pub enum CondType { Continue, Stop, } pub async fn new_proxy<F, C>(config: SocketConfig, validate: F, callback: C) -> anyhow::Result<()> where F: Fn(&SocketAddr) -> anyhow::Result<ValidateType>, C: Fn(anyhow::Error) -> anyhow::Result<CondType> + Sync + Send + Copy + 'static, { let listen_addr = config.server_addr.clone(); let to_addr = config.to_addr; let listener = TcpListener::bind(listen_addr).await?; while let Ok((inbound, remote_addr)) = listener.accept().await { if let Err(err) = validate(&remote_addr) { error!("validate error:{}", err); } else { debug!("remote_addr:{}", remote_addr.to_string()); let transfer = transfer(inbound, to_addr.clone()).map(move |r| { if let Err(e) = r { match callback(e) { Ok(CondType::Stop) => { warn!("system call stop"); return; } Err(e) => { error!("Failed to transfer error:{}", e); } _ => {} } } }); tokio::spawn(transfer); } } Ok(()) } async fn transfer(mut inbound: TcpStream, to_addr: String) -> anyhow::Result<()> { let mut outbound = TcpStream::connect(to_addr).await?; let (mut ri, mut wi) = inbound.split(); let (mut ro, mut wo) = outbound.split(); let client_to_server = async { io::copy(&mut ri, &mut wo).await?; wo.shutdown().await }; let server_to_client = async { io::copy(&mut ro, &mut wi).await?; wi.shutdown().await }; tokio::try_join!(client_to_server, server_to_client)?; Ok(()) }