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diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..23f727b --- /dev/null +++ b/src/main.rs @@ -0,0 +1,223 @@ +use anyhow::Context; +use futures_util::{SinkExt, StreamExt}; +use tokio::{ + io::{AsyncReadExt, AsyncWriteExt}, + net::TcpStream, +}; + +use clap::Parser; +use tungstenite::Message; + +#[cfg(feature = "socket_activation")] +use std::os::fd::FromRawFd; + +#[derive(Parser)] +struct Args { + #[command(subcommand)] + command: SubCommand, +} + +#[derive(Parser)] +enum SubCommand { + #[command()] + Connect(ConnectArgs), + + #[command()] + Server(ServerArgs), + + #[cfg(feature = "socket_activation")] + #[command()] + SocketActivation, +} + +#[derive(Parser)] +struct ConnectArgs { + #[arg()] + uri: String, +} + +#[derive(Parser)] +struct ServerArgs { + #[arg(long, default_value = "0.0.0.0")] + host: String, + + #[arg(short, long, default_value = "2222")] + port: u16, + + #[arg(short, long, default_value = "localhost:22")] + ssh_socket: String, +} + +#[tokio::main] +async fn main() -> anyhow::Result<()> { + env_logger::init(); + let args = Args::parse(); + + match args.command { + SubCommand::Connect(args) => connect(args).await, + SubCommand::Server(args) => server(args).await, + #[cfg(feature = "socket_activation")] + SubCommand::SocketActivation => socket_activation().await, + } +} + +async fn connect(args: ConnectArgs) -> anyhow::Result<()> { + log::info!("Connecting to {}", args.uri); + + let (stream, _) = tokio_tungstenite::connect_async(args.uri) + .await + .context("Failed to connect to the server")?; + + log::info!("Connected to the server"); + + let (mut tx, mut rx) = stream.split(); + + let stdin_forwarder = tokio::spawn(async move { + log::trace!("Starting stdin forwarder"); + let mut buf_stdin = tokio::io::stdin(); + loop { + let mut buffer = Vec::new(); + match buf_stdin + .read_buf(&mut buffer) + .await + .context("Failed to read from stdin") + { + Err(e) => { + log::error!("Error reading from stdin: {}", e); + break; + } + Ok(0) => { + continue; + } + Ok(1..) => { + log::trace!("C->S {:?}", String::from_utf8_lossy(&buffer)); + } + } + + if let Err(e) = tx + .send(Message::Binary(buffer)) + .await + .context("Failed to forward data from stdin") + { + log::error!("Error sending data to server: {}", e); + break; + } + } + }); + + let stdout_receiver = tokio::spawn(async move { + log::trace!("Starting stdout receiver"); + let mut buf_stdout = tokio::io::stdout(); + loop { + match rx.next().await.unwrap().unwrap() { + Message::Binary(data) => { + log::trace!("C<-S {:?}", String::from_utf8_lossy(&data)); + + buf_stdout.write_all(&data).await.unwrap(); + buf_stdout.flush().await.unwrap(); + } + _ => panic!("Unexpected message type"), + } + } + }); + + tokio::try_join!(stdin_forwarder, stdout_receiver)?; + + Ok(()) +} + +// --------------------------------------------------------- // + +async fn server(args: ServerArgs) -> anyhow::Result<()> { + let addr = format!("{}:{}", args.host, args.port); + let listener = tokio::net::TcpListener::bind(&addr) + .await + .context("Failed to bind to address")?; + + log::info!("Listening on {}", &addr); + loop { + tokio::select! { + Ok((stream, _)) = listener.accept() => { + log::info!("Accepted connection from {}", stream.peer_addr()?); + tokio::spawn(handle_client(stream, args.ssh_socket.clone())); + } + _ = tokio::signal::ctrl_c() => break, + } + } + + Ok(()) +} + +async fn handle_client(stream: TcpStream, ssh_socket: String) -> anyhow::Result<()> { + log::trace!("Accepting WebSocket connection"); + let stream = tokio_tungstenite::accept_async(stream) + .await + .expect("Error during WebSocket handshake"); + let (mut tx, mut rx) = stream.split(); + + log::trace!("Connecting to SSH server"); + let ssh_stream = TcpStream::connect(ssh_socket) + .await + .context("Failed to connect to SSH server")?; + let (mut ssh_rx, mut ssh_tx) = tokio::io::split(ssh_stream); + + let stdin_receiver = tokio::spawn(async move { + log::trace!("Starting stdin receiver"); + loop { + match rx.next().await { + Some(Ok(Message::Binary(data))) => { + log::trace!("S<-C {:?}", String::from_utf8_lossy(&data)); + if let Err(e) = ssh_tx.write_all(&data).await { + log::error!("Error sending data to SSH server: {}", e); + break; + } + ssh_tx.flush().await.unwrap(); + } + None => { + eprintln!("Websocket connection closed"); + break; + } + Some(Err(e)) => { + eprintln!("Websocket error: {}", e); + break; + } + Some(Ok(m)) => panic!("Unexpected message: {:?}", m), + } + } + }); + + let stdout_forwarder = tokio::spawn(async move { + log::trace!("Starting stdout forwarder"); + loop { + let mut buffer = Vec::new(); + match ssh_rx.read_buf(&mut buffer).await { + Err(e) => { + log::error!("Error reading from SSH server: {}", e); + break; + } + Ok(0) => { + continue; + } + Ok(1..) => { + log::info!("S->C {:?}", String::from_utf8_lossy(&buffer)); + } + } + + if let Err(e) = tx.send(Message::Binary(buffer)).await { + log::error!("Error sending data to client: {}", e); + break; + } + } + }); + + tokio::try_join!(stdin_receiver, stdout_forwarder)?; + Ok(()) +} + +// --------------------------------------------------------- // + +#[cfg(feature = "socket_activation")] +async fn socket_activation() -> anyhow::Result<()> { + let raw_connection = unsafe { std::net::TcpStream::from_raw_fd(3) }; + Ok(()) +}