Basic rust ssh2 ssh -L port forward

main.rs

#[cfg(test)]
mod test {
    #[test]
    fn foo() {
        // start a local tcp echo server:
        // ncat -l 127.0.0.1 2000 -k -c 'xargs -n1 echo'
        use ssh2::Session;
        use std::io::prelude::*;
        use std::net::TcpStream;

        let tcp = TcpStream::connect("127.0.0.1:22").unwrap();
        let mut sess = Session::new().unwrap();
        sess.set_tcp_stream(tcp);
        sess.handshake().unwrap();
        sess.userauth_agent("fred").unwrap();

        let mut chan = sess.channel_direct_tcpip("127.0.01", 2000, None).unwrap();
        println!("conn");

        let msg = b"hallo\n";
        let w = chan.write(msg).unwrap();
        assert_eq!(msg.len(), w);

        chan.flush().unwrap();
        println!("{w} write");

        let mut ret = vec![0u8; w];
        chan.read_exact(&mut ret).unwrap();
        assert_eq!(*msg, *ret);
        let ret = String::from_utf8(ret).unwrap();
        println!("read: {ret:?}");
    }
}