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"c811ca4a8c853ef420abd8592ba53ddbbac90410fab6903b3e79972a631f7680" diff --git a/Cargo.toml b/Cargo.toml new file mode 100644 index 0000000..cb4c353 --- /dev/null +++ b/Cargo.toml @@ -0,0 +1,11 @@ +[package] +name = "lazyprox" +version = "0.1.0" +edition = "2021" + +[dependencies] +tokio = { version = "1.4", features = ["full"] } +clap = { version = "3.2", features = ["derive"] } +env_logger = "0.8" +log = "0.4" +futures = "0.3" diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..9d41c6b --- /dev/null +++ b/LICENSE @@ -0,0 +1,7 @@ +Copyright 2022 Elliot Levin + +Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. \ No newline at end of file diff --git a/README.md b/README.md new file mode 100644 index 0000000..8e57db4 --- /dev/null +++ b/README.md @@ -0,0 +1,48 @@ +# lazyprox +Minimal TCP proxy with an exit-on-idle timeout configuration option. Useful for sparing resources on idling devcontainers. + +**⚠️ Warning:** This was built in a night to scratch a personal itch, please remove any expectation of this working for your use-case or support. + +### Usage + +``` +./target/release/lazyprox --help +lazyprox 0.1.0 + +USAGE: + lazyprox --listen --dest --idle-timeout-secs + +OPTIONS: + -d, --dest + Socket address of TCP destination, eg localhost:22 + + -h, --help + Print help information + + -i, --idle-timeout-secs + Number of seconds of idle time before exiting + + -l, --listen + Bind socket address of TCP listener, eg 0.0.0.0:2222 + + -V, --version + Print version information + +``` + +### Download + +| Targets | +|---------| +| `x86_64-unknown-linux-gnu` | +| `x86_64-unknown-linux-musl` | +| `aarch64-unknown-linux-gnu` | +| `aarch64-unknown-linux-musl` | + +Example: + +```sh +curl https://lazyprox.elliotlevin.dev/lazyprox-x86_64-unknown-linux-musl -o lazyprox +chmod +x ./lazyprox +./lazyprox --help +``` \ No newline at end of file diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..5e33ab5 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,166 @@ +use std::{ + net::{SocketAddr, ToSocketAddrs}, + time::Duration, +}; + +use clap::Parser; +use futures::future; +use log::{debug, error, info}; +use tokio::{ + io::{self, AsyncReadExt, AsyncWriteExt}, + net::{TcpSocket, TcpStream, tcp::{OwnedReadHalf, OwnedWriteHalf}}, + sync::mpsc::{self, UnboundedSender}, + time, +}; + +#[derive(Parser, Debug)] +#[clap(author, version, about, long_about = None)] +struct Args { + #[clap( + short, + long, + value_parser, + help = "Bind socket address of TCP listener, eg 0.0.0.0:2222" + )] + listen: String, + + #[clap( + short, + long, + value_parser, + help = "Socket address of TCP destination, eg localhost:22" + )] + dest: String, + + #[clap( + short, + long, + value_parser, + help = "Number of seconds of idle time before exiting" + )] + idle_timeout_secs: u32, +} + +#[tokio::main] +async fn main() { + env_logger::init_from_env( + env_logger::Env::default().filter_or(env_logger::DEFAULT_FILTER_ENV, "info"), + ); + let args = Args::parse(); + + let bind_addr: SocketAddr = args + .listen + .to_socket_addrs() + .expect("Failed to parse --listen arg as socket address") + .filter(|i| i.is_ipv4()) + .next() + .unwrap(); + let dest_addr: SocketAddr = args + .dest + .to_socket_addrs() + .expect("Failed to parse --dest arg as socket address") + .filter(|i| i.is_ipv4()) + .next() + .unwrap(); + + let socket = TcpSocket::new_v4().unwrap(); + socket.set_reuseaddr(true).unwrap(); + socket + .bind(bind_addr) + .expect(&format!("Failed to bind to {}", bind_addr)); + + let listener = socket.listen(1024).unwrap(); + info!("Listening on {}", bind_addr); + + let timeout = Duration::from_secs(args.idle_timeout_secs as _); + let (activity_tx, mut activity_rx) = mpsc::unbounded_channel(); + + loop { + tokio::select! { + accept = listener.accept() => { + let (upstream, addr) = accept.expect("Failed to accept connection"); + info!("Received connection from {}", addr); + + let downstream = match TcpStream::connect(dest_addr).await { + Ok(dest) => dest, + Err(err) => { + error!("Failed to connect to {dest_addr}: {err}"); + continue; + } + }; + + tokio::spawn(forward(upstream, downstream, activity_tx.clone())); + }, + _ = activity_rx.recv() => { + debug!("Notified of activity"); + } + _ = time::timeout(timeout, future::pending::<()>()) => { + info!("Timed out after {} seconds while waiting for activity, exiting...", args.idle_timeout_secs); + break; + } + } + } + + info!("Exiting"); +} + +async fn forward(upstream: TcpStream, downstream: TcpStream, tx: UnboundedSender<()>) { + let upstream_addr = upstream.peer_addr().ok(); + let downstream_addr = downstream.peer_addr().ok(); + + info!( + "Forwarding from {:?} to {:?}", + upstream_addr, downstream_addr + ); + + let (upstream_read, upstream_write) = upstream.into_split(); + let (downstream_read, downstream_write) = downstream.into_split(); + + let res = tokio::select! { + res = forward_loop(upstream_read, downstream_write, tx.clone()) => res, + res = forward_loop(downstream_read, upstream_write, tx.clone()) => res, + }; + + match res { + Ok(_) => info!( + "Finished forwarding from {:?} to {:?}", + upstream_addr, downstream_addr + ), + Err(err) => error!( + "Error while forwarding from {:?} to {:?}: {}", + upstream_addr, downstream_addr, err + ), + } + + let _ = tx.send(()); +} + +async fn forward_loop( + mut input: OwnedReadHalf, + mut output: OwnedWriteHalf, + tx: UnboundedSender<()>, +) -> Result<(), io::Error> { + let mut buff = [0u8; 1024]; + + loop { + if let Err(err) = output.writable().await { + return Err(err); + } + + let _ = tx.send(()); + + let read = input.read(&mut buff).await?; + let _ = tx.send(()); + + if read == 0 { + output.shutdown().await?; + break; + } + + output.write_all(&buff[..read]).await?; + output.flush().await?; + let _ = tx.send(()); + } + + Ok(()) +}