Dockerfile

FROM rust
WORKDIR /usr/src/fakesas
COPY . .
RUN cargo build --release
CMD ["./target/release/fakesas"]

main.rs

use std::io::Read;
use std::net::{TcpListener, TcpStream};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let tcpl = TcpListener::bind("0.0.0.0:6761")?;
    loop {
        let a = tcpl.accept();
        if let Err(ref e) = a {
            eprintln!("Error accepting connection: {}", e);
        }
        let (mut astream, peer) = a.unwrap();
        println!("Accepted connection from {}", peer);
        std::thread::spawn(move || {
            let mut buf = vec![0u8; 1 << 16];
            loop {
                let res = astream.read(&mut buf);
                if let Err(ref e) = res {
                    eprintln!("Error reading from {}: {}", peer, e);
                    break;
                } else if res.unwrap() == 0 {
                    println!("Connection from {} closed", peer);
                    break;
                }
            }
        });
    }
}