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//! Unix remote-host side of the SSH stdio bridge.
use std::io;
use std::os::unix::net::UnixStream;
use std::thread;
use std::time::Duration;
pub(crate) fn run_remote_client_bridge() -> io::Result<()> {
ensure_remote_server_running()?;
let socket_path = crate::server::socket_paths::client_socket_path();
let stream = UnixStream::connect(&socket_path).map_err(|err| {
io::Error::new(
err.kind(),
format!(
"failed to connect to remote Herdr client socket {}: {err}",
socket_path.display()
),
)
})?;
let mut stdout = io::stdout().lock();
let mut socket_to_stdout = stream.try_clone()?;
let mut stdin_to_socket = stream;
let _upload = thread::spawn(move || {
let mut stdin = io::stdin();
let _ = copy_flush(&mut stdin, &mut stdin_to_socket);
let _ = stdin_to_socket.shutdown(std::net::Shutdown::Write);
});
copy_flush(&mut socket_to_stdout, &mut stdout).map(|_| ())
}
fn copy_flush<R: io::Read, W: io::Write>(reader: &mut R, writer: &mut W) -> io::Result<u64> {
let mut buffer = [0_u8; 16 * 1024];
let mut total = 0;
loop {
let read = match reader.read(&mut buffer) {
Ok(0) => return Ok(total),
Ok(read) => read,
Err(err) if err.kind() == io::ErrorKind::Interrupted => continue,
Err(err) => return Err(err),
};
writer.write_all(&buffer[..read])?;
writer.flush()?;
total += read as u64;
}
}
fn ensure_remote_server_running() -> io::Result<()> {
let socket_path = crate::server::socket_paths::client_socket_path();
if crate::server::autodetect::is_server_listening() {
let status = crate::api::read_runtime_status_at(
&crate::api::socket_path(),
Duration::from_millis(500),
)?
.ok_or_else(|| io::Error::other("remote server status API is unavailable"))?;
if status
.capabilities
.as_ref()
.and_then(|capabilities| capabilities.endpoint_protocol_generation)
== Some(crate::protocol::endpoint::ENDPOINT_PROTOCOL_GENERATION)
{
return Ok(());
}
return Err(io::Error::other(
"remote herdr server needs one final update before this bridge can attach; rerun `herdr --remote` from an interactive terminal to approve it",
));
}
crate::server::autodetect::spawn_server_daemon()?;
crate::server::autodetect::wait_for_server_socket(&socket_path, Duration::from_secs(5))
}
|
