clan-sidebus/sidebus-agent/src/main.rs

use eyre::OptionExt;
use tokio::net::UnixListener;
use tracing::info;

#[tokio::main]
async fn main() -> eyre::Result<()> {
    tracing_subscriber::fmt::init();

    let creds_dir = std::path::PathBuf::try_from(std::env::var("CREDENTIALS_DIRECTORY")?)?;
    let vsock_port = std::fs::read_to_string(creds_dir.join("sidebus.port"))?
        .trim()
        .parse::<u32>()?;

    let unix_listener = UnixListener::from_std(
        listenfd::ListenFd::from_env()
            .take_unix_listener(0)?
            .ok_or_eyre("no unix listener provided")?,
    )?;
    info!("listening for unix clients");

    while let Ok((unix_client, client_addr)) = unix_listener.accept().await {
        info!(?client_addr, "new unix client");
        tokio::spawn(async move {
            let vsock_addr = zbus::Address::from(zbus::address::Transport::Vsock(
                zbus::address::transport::Vsock::new(2, vsock_port),
            ));
            let vsock_conn = zbus::connection::Builder::address(vsock_addr)
                .unwrap()
                .p2p()
                .auth_mechanism(zbus::AuthMechanism::Anonymous)
                .build()
                .await
                .unwrap();
            info!(guid = %vsock_conn.server_guid(), "connected to vsock bus");
            let client_conn = zbus::connection::Builder::unix_stream(unix_client)
                .server(vsock_conn.server_guid())
                .unwrap()
                .p2p()
                .auth_mechanism(zbus::AuthMechanism::External)
                .build()
                .await
                .unwrap();
            sidebus_common::raw::splice_conns(client_conn, vsock_conn).await;
        });
    }
    Ok(())
}