socks-hub 0.2.6

Convert http proxy or socks5 proxy to socks5 proxy.
Documentation 
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cfg_if::cfg_if! {
    if #[cfg(feature = "acl")] {
        mod acl;
        pub use acl::AccessControl;
    }
}

//
// can't use cfg_if here, because it will cause cbindgen to can't generate ffi.h correctly.
// see this issue: https://github.com/mozilla/cbindgen/issues/935
//
// cfg_if::cfg_if! {
//     if #[cfg(feature = "sockshub")] {

#[cfg(feature = "sockshub")]
mod config;
#[cfg(feature = "sockshub")]
pub use config::{ArgVerbosity, Config};

#[cfg(feature = "sockshub")]
mod tokiort;
#[cfg(feature = "sockshub")]
pub use socks5_impl::protocol::{Address, ProxyParameters, ProxyType, UserKey};
#[cfg(feature = "sockshub")]
use tokiort::TokioIo;

#[cfg(feature = "sockshub")]
mod http2socks;
#[cfg(feature = "sockshub")]
mod socks2socks;

#[cfg(feature = "sockshub")]
mod api;
#[cfg(feature = "sockshub")]
mod dump_logger;
#[cfg(feature = "sockshub")]
mod ffi;

#[cfg(feature = "sockshub")]
pub type BoxError = Box<dyn std::error::Error + Send + Sync + 'static>;
#[cfg(feature = "sockshub")]
pub type Result<T, E = BoxError> = std::result::Result<T, E>;

#[cfg(feature = "sockshub")]
pub async fn main_entry<F>(config: &Config, cancel_token: tokio_util::sync::CancellationToken, callback: Option<F>) -> Result<(), BoxError>
where
    F: FnOnce(std::net::SocketAddr) + Send + Sync + 'static,
{
    if config.remote_server.proxy_type != ProxyType::Socks5 {
        return Err("remote server must be socks5".into());
    }
    if let Some(middle_server) = &config.middle_server {
        if middle_server.proxy_type != ProxyType::Socks5 {
            return Err("middle server must be socks5".into());
        }
    }
    match config.listen_proxy_role.proxy_type {
        ProxyType::Http => http2socks::main_entry(config, cancel_token, callback).await,
        ProxyType::Socks5 => socks2socks::main_entry(config, cancel_token, callback).await,
        _ => Err("listen proxy must be http or socks5".into()),
    }
}

#[cfg(feature = "sockshub")]
pub(crate) const CONNECT_TIMEOUT: std::time::Duration = std::time::Duration::from_secs(5);

#[cfg(feature = "sockshub")]
pub(crate) async fn create_s5_connect(
    server: ProxyParameters,
    dur: std::time::Duration,
    dst: &socks5_impl::protocol::Address,
    middle_server: Option<ProxyParameters>,
) -> std::io::Result<tokio::io::BufStream<tokio::net::TcpStream>> {
    let auth = server.credentials.clone();
    let mut stream = connect_proxy_stream(server, dur, middle_server).await?;
    socks5_impl::client::connect(&mut stream, dst, auth)
        .await
        .map_err(std_io_error_other)?;
    Ok(stream)
}

#[cfg(feature = "sockshub")]
async fn connect_proxy_stream(
    server: ProxyParameters,
    dur: std::time::Duration,
    middle_server: Option<ProxyParameters>,
) -> std::io::Result<tokio::io::BufStream<tokio::net::TcpStream>> {
    let stream = if let Some(middle_server) = middle_server {
        let middle_addr: std::net::SocketAddr = middle_server.addr.try_into()?;
        let stream = tokio::time::timeout(dur, tokio::net::TcpStream::connect(middle_addr)).await??;
        let mut stream = tokio::io::BufStream::new(stream);
        let middle_auth = middle_server.credentials.clone();
        socks5_impl::client::connect(&mut stream, server.addr, middle_auth)
            .await
            .map_err(std_io_error_other)?;
        stream
    } else {
        let server_addr: std::net::SocketAddr = server.addr.try_into()?;
        let stream = tokio::time::timeout(dur, tokio::net::TcpStream::connect(server_addr)).await??;
        tokio::io::BufStream::new(stream)
    };
    Ok(stream)
}

#[cfg(feature = "sockshub")]
pub(crate) async fn create_s5_udp_client(
    server: ProxyParameters,
    dur: std::time::Duration,
    middle_server: Option<ProxyParameters>,
) -> std::io::Result<socks5_impl::client::SocksUdpClient> {
    let stream = connect_proxy_stream(server.clone(), dur, middle_server).await?;
    let client_addr = if server.addr.is_ipv4() { "0.0.0.0:0" } else { "[::]:0" };
    let client = tokio::net::UdpSocket::bind(client_addr).await?;
    let auth = server.credentials.clone();
    socks5_impl::client::SocksDatagram::udp_associate(stream, client, auth)
        .await
        .map_err(std_io_error_other)
}

#[cfg(feature = "sockshub")]
pub(crate) fn std_io_error_other<E: Into<BoxError>>(err: E) -> std::io::Error {
    std::io::Error::other(err)
}

//     }
// }