shadowsocks-rust 1.3.2

shadowsocks is a fast tunnel proxy that helps you bypass firewalls.
Documentation 
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//! TCP relay client implementation

use std::io::{self, Read, Write};
use std::net::SocketAddr;

use tokio_core::reactor::Handle;
use tokio_core::net::TcpStream;
use tokio_io::io::flush;
use tokio_io::{AsyncRead, AsyncWrite};

use futures::{self, Future, Poll, Async};

use relay::socks5::{self, HandshakeRequest, HandshakeResponse, Address, TcpRequestHeader, TcpResponseHeader, Command,
                    Reply};
use relay::{BoxIoFuture, boxed_future};

/// Socks5 proxy client
pub struct Socks5Client {
    stream: TcpStream,
}

impl Socks5Client {
    /// Connects to `addr` via `proxy`
    pub fn connect<A>(addr: A, proxy: SocketAddr, handle: Handle) -> BoxIoFuture<Socks5Client>
        where Address: From<A>,
              A: 'static
    {
        let fut = futures::lazy(move || TcpStream::connect(&proxy, &handle))
            .and_then(move |s| {
                // 1. Handshake
                let hs = HandshakeRequest::new(vec![socks5::SOCKS5_AUTH_METHOD_NONE]);
                trace!("Client connected, going to send handshake: {:?}", hs);

                hs.write_to(s)
                    .and_then(flush)
                    .and_then(HandshakeResponse::read_from)
                    .and_then(|(s, rsp)| {
                        trace!("Got handshake response: {:?}", rsp);
                        assert_eq!(rsp.chosen_method, socks5::SOCKS5_AUTH_METHOD_NONE);
                        Ok(s)
                    })
            })
            .and_then(move |s| {
                // 2. Send request header
                let h = TcpRequestHeader::new(Command::TcpConnect, From::from(addr));
                trace!("Going to connect, req: {:?}", h);
                h.write_to(s)
                    .and_then(flush)
                    .and_then(|s| TcpResponseHeader::read_from(s).map_err(From::from))
                    .and_then(|(s, rsp)| {
                        trace!("Got response: {:?}", rsp);
                        match rsp.reply {
                            Reply::Succeeded => Ok(s),
                            r => {
                                let err = io::Error::new(io::ErrorKind::Other, format!("{}", r));
                                Err(err)
                            }
                        }
                    })
            })
            .map(|s| Socks5Client { stream: s });

        boxed_future(fut)
    }

    /// UDP Associate `addr` via `proxy`
    pub fn udp_associate<A>(addr: A, proxy: SocketAddr, handle: Handle) -> BoxIoFuture<(Socks5Client, Address)>
        where Address: From<A>,
              A: 'static
    {
        let fut = futures::lazy(move || TcpStream::connect(&proxy, &handle))
            .and_then(move |s| {
                // 1. Handshake
                let hs = HandshakeRequest::new(vec![socks5::SOCKS5_AUTH_METHOD_NONE]);
                trace!("Client connected, going to send handshake: {:?}", hs);

                hs.write_to(s)
                    .and_then(flush)
                    .and_then(HandshakeResponse::read_from)
                    .and_then(|(s, rsp)| {
                        trace!("Got handshake response: {:?}", rsp);
                        assert_eq!(rsp.chosen_method, socks5::SOCKS5_AUTH_METHOD_NONE);
                        Ok(s)
                    })
            })
            .and_then(move |s| {
                // 2. Send request header
                let h = TcpRequestHeader::new(Command::UdpAssociate, From::from(addr));
                trace!("Going to connect, req: {:?}", h);
                h.write_to(s)
                    .and_then(flush)
                    .and_then(|s| TcpResponseHeader::read_from(s).map_err(From::from))
                    .and_then(|(s, rsp)| {
                        trace!("Got response: {:?}", rsp);
                        match rsp.reply {
                            Reply::Succeeded => Ok((s, rsp.address)),
                            r => {
                                let err = io::Error::new(io::ErrorKind::Other, format!("{}", r));
                                Err(err)
                            }
                        }
                    })
            })
            .map(|(s, a)| (Socks5Client { stream: s }, a));

        boxed_future(fut)
    }
}

impl Read for Socks5Client {
    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
        self.stream.read(buf)
    }
}

impl Write for Socks5Client {
    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
        self.stream.write(buf)
    }

    fn flush(&mut self) -> io::Result<()> {
        self.stream.flush()
    }
}

impl AsyncRead for Socks5Client {}
impl AsyncWrite for Socks5Client {
    fn shutdown(&mut self) -> Poll<(), io::Error> {
        // FIXME: Finalize the internal cipher
        Ok(Async::Ready(()))
    }
}