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    use std::io;
    use std::net::TcpListener;
    use std::sync::Arc;
    use std::thread;

    use connection::{Connection, ConnectionType};
    use public_key::KeyPair;

    pub struct ServerConfig {
        pub host: String,
        pub port: u16,
        pub key: Box<KeyPair>,
    }

    pub struct Server {
        config: Arc<ServerConfig>,
    }

    impl Server {
        pub fn with_config(config: ServerConfig) -> Server {
            Server { config: Arc::new(config) }
        }

        pub fn run(&self) -> io::Result<()> {
            let listener =
                TcpListener::bind((&*self.config.host, self.config.port))?;

            loop {
                let (mut stream, addr) = listener.accept()?;
                let config = self.config.clone();

                debug!("Incoming connection from {}", addr);

                thread::spawn(move || {
                    let mut connection =
                        Connection::new(ConnectionType::Server(config));

                    let result = connection.run(&mut stream);

                    if let Some(error) = result.err() {
                        println!("sshd: {}", error)
                    }
                });
            }

            Ok(())
        }
    }

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