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#[warn(unused_imports)]
#[allow(dead_code)]
use anyhow::Result;
use async_std::net::TcpStream;
use futures::future::*;
use futures::io::{AsyncRead, AsyncWrite};
use futures::stream::{self, SelectAll, Stream, StreamExt};
use futures::AsyncReadExt;
use quinn::{
Certificate, CertificateChain, ClientConfig, ClientConfigBuilder, Endpoint, Incoming, PrivateKey,
ServerConfig, ServerConfigBuilder, TransportConfig,
};
use std::boxed::Box;
use std::path::Path;
use std::task::{Context, Poll};
use std::{net::SocketAddr, sync::Arc};
pub mod delegation;
pub mod framed;
mod mapped_owned_async_mutex;
pub(crate) mod merge_streams;
pub(crate) mod messenger;
pub mod tunnel_stream;
pub mod validators;
pub(crate) mod vtdroppable;
pub use mapped_owned_async_mutex::MappedOwnedMutexGuard;
pub const ALPN_QUIC_HTTP: &[&[u8]] = &[b"hq-29"];
pub async fn proxy_stream<Send: AsyncWrite + Unpin, Recv: AsyncRead + Unpin>(
recv: &mut Recv,
send: &mut Send,
) -> Result<u64> {
use futures::io::AsyncWriteExt;
futures::io::copy_buf(futures::io::BufReader::with_capacity(1024 * 32, recv), send)
.await
.map_err(Into::into)
}
#[tracing::instrument(skip(a, b))]
pub async fn proxy_generic_streams<
SenderA: AsyncWrite + Unpin,
ReaderA: AsyncRead + Unpin,
SenderB: AsyncWrite + Unpin,
ReaderB: AsyncRead + Unpin,
>(
a: (&mut SenderA, &mut ReaderA),
b: (&mut SenderB, &mut ReaderB),
) -> Either<(), ()> {
let (sender_a, reader_a) = a;
let (sender_b, reader_b) = b;
let proxy_a2b = Box::pin(proxy_stream(reader_a, sender_b).fuse());
let proxy_b2a = Box::pin(proxy_stream(reader_b, sender_a).fuse());
tracing::trace!("polling");
let res: Either<(), ()> = match futures::future::try_select(proxy_a2b, proxy_b2a).await {
Ok(Either::Left((_i2o, resume_o2i))) => {
tracing::debug!("Source connection closed gracefully, shutting down proxy");
std::mem::drop(resume_o2i);
Either::Right(())
}
Ok(Either::Right((_o2i, resume_i2o))) => {
tracing::debug!("Proxy connection closed gracefully, shutting down source");
std::mem::drop(resume_i2o);
Either::Left(())
}
Err(Either::Left((e_i2o, resume_o2i))) => {
tracing::debug!(
"Source connection died with error {:#?}, shutting down proxy connection",
e_i2o
);
std::mem::drop(resume_o2i);
Either::Right(())
}
Err(Either::Right((e_o2i, resume_i2o))) => {
tracing::debug!(
"Proxy connection died with error {:#?}, shutting down source connection",
e_o2i
);
std::mem::drop(resume_i2o);
Either::Left(())
}
};
res
}
pub async fn proxy_tcp_streams(mut source: TcpStream, mut proxy: TcpStream) -> Result<()> {
let res: Either<_, _> = {
let (mut reader, mut writer) = (&mut source).split();
let (mut proxy_reader, mut proxy_writer) = (&mut proxy).split();
proxy_generic_streams(
(&mut writer, &mut reader),
(&mut proxy_writer, &mut proxy_reader),
)
.await
};
match res {
Either::Left(_) => {
if let Err(shutdown_failure) = source.shutdown(async_std::net::Shutdown::Both) {
tracing::error!(
"Failed to shut down source connection with error:\n{:#?}",
shutdown_failure
);
}
}
Either::Right(_) => {
if let Err(shutdown_failure) = proxy.shutdown(async_std::net::Shutdown::Both) {
tracing::error!(
"Failed to shut down proxy connection with error:\n{:#?}",
shutdown_failure
);
}
}
}
Ok(())
}
pub async fn proxy_from_tcp_stream<Sender: AsyncWrite + Unpin, Reader: AsyncRead + Unpin>(
mut source: TcpStream,
proxy: (&mut Sender, &mut Reader),
) -> Result<()> {
let res: Either<_, _> = {
let (mut reader, mut writer) = (&mut source).split();
proxy_generic_streams((&mut writer, &mut reader), proxy).await
};
match res {
Either::Left(_) => {
if let Err(shutdown_failure) = source.shutdown(async_std::net::Shutdown::Both) {
tracing::error!(
"Failed to shut down source connection with error:\n{:#?}",
shutdown_failure
);
}
}
Either::Right(_) => {
}
}
Ok(())
}
pub async fn finally_async<
T,
E,
FT: Future<Output = Result<T, E>>,
FC: Future<Output = Result<(), E>>,
>(
cb: impl FnOnce() -> FT,
cleanup: impl FnOnce(&mut Result<T, E>) -> FC,
) -> Result<T, E> {
let mut cb_res = cb().await;
let cleanup_res = cleanup(&mut cb_res).await;
match cleanup_res {
Ok(_) => cb_res,
Err(e) => match cb_res {
Ok(_res) => Err(e),
Err(e2) => Err(e2),
},
}
}