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Toshit Chawda 2024-01-05 11:16:19 -08:00
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dependencies = [
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]

16
Cargo.toml Normal file
View file

@ -0,0 +1,16 @@
[package]
name = "wsproxy-rust"
version = "0.1.0"
edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
bytes = "1.5.0"
futures-util = "0.3.30"
http-body-util = "0.1.0"
hyper = { version = "1.1.0", features = ["server", "http1"] }
hyper-util = { version = "0.1.2", features = ["tokio"] }
tokio = { version = "1.5.1", features = ["rt-multi-thread", "macros"] }
tokio-tungstenite = "0.20.1"
tokio-util = { version = "0.7.10", features = ["codec"] }

199
src/main.rs Normal file
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@ -0,0 +1,199 @@
use std::{convert::Infallible, io::Error};
use bytes::{BufMut, BytesMut};
use futures_util::{SinkExt, StreamExt};
use hyper::{
body::Incoming,
header::{
HeaderValue, CONNECTION, SEC_WEBSOCKET_ACCEPT, SEC_WEBSOCKET_KEY, SEC_WEBSOCKET_VERSION,
UPGRADE,
},
server::conn::http1,
service::service_fn,
upgrade::Upgraded,
Method, Request, Response, StatusCode, Version
};
use hyper_util::rt::TokioIo;
use tokio::net::{TcpListener, TcpStream};
use tokio_tungstenite::{
tungstenite::{protocol::Role, handshake::derive_accept_key, Message},
WebSocketStream,
};
use tokio_util::codec::{Decoder, Encoder, FramedRead, FramedWrite};
struct NetworkCodec;
impl Encoder<Vec<u8>> for NetworkCodec {
type Error = std::io::Error;
fn encode(&mut self, item: Vec<u8>, dst: &mut BytesMut) -> Result<(), Self::Error> {
dst.put_slice(item.as_slice());
Ok(())
}
}
impl Decoder for NetworkCodec {
type Item = Vec<u8>;
type Error = std::io::Error;
fn decode(&mut self, src: &mut BytesMut) -> Result<Option<Self::Item>, Self::Error> {
Ok(Some(src.to_vec()))
}
}
type HttpBody = http_body_util::Full<hyper::body::Bytes>;
#[tokio::main(flavor = "multi_thread", worker_threads = 32)]
async fn main() -> Result<(), Error> {
let socket = TcpListener::bind("0.0.0.0:4000")
.await
.expect("failed to bind");
println!("listening on 0.0.0.0:4000");
while let Ok((stream, addr)) = socket.accept().await {
println!("socket connected: {:?}", addr);
tokio::spawn(async move {
let io = TokioIo::new(stream);
let service = service_fn(accept_http);
let conn = http1::Builder::new()
.serve_connection(io, service)
.with_upgrades();
if let Err(err) = conn.await {
println!("failed to serve conn: {:?}", err);
}
});
}
Ok(())
}
async fn accept_http(mut req: Request<Incoming>) -> Result<Response<HttpBody>, Infallible> {
let incoming_uri = req.uri().clone();
let req_ver = req.version();
let req_headers = req.headers().clone();
let req_key = req_headers.get(SEC_WEBSOCKET_KEY);
let derived_key = req_key.map(|k| derive_accept_key(k.as_bytes()));
if req.method() != Method::GET
|| req.version() < Version::HTTP_11
|| !req_headers
.get(CONNECTION)
.and_then(|h| h.to_str().ok())
.map(|h| {
h.split(|c| c == ' ' || c == ',')
.any(|p| p.eq_ignore_ascii_case("Upgrade"))
})
.unwrap_or(false)
|| !req_headers
.get(UPGRADE)
.and_then(|h| h.to_str().ok())
.map(|h| h.eq_ignore_ascii_case("websocket"))
.unwrap_or(false)
|| !req_headers.get(SEC_WEBSOCKET_VERSION).map(|h| h == "13").unwrap_or(false)
|| req_key.is_none()
{
return Ok(Response::new(HttpBody::from("Hello World!")));
}
tokio::spawn(async move {
match hyper::upgrade::on(&mut req).await {
Ok(upgraded) => {
println!("upgraded connection");
let upgraded_io = TokioIo::new(upgraded);
accept_ws(
WebSocketStream::from_raw_socket(upgraded_io, Role::Server, None).await,
incoming_uri.path().to_string(),
).await;
}
Err(e) => {
println!("upgrade error! {:?}", e);
}
}
});
println!("sending upgrade response");
let mut res = Response::new(HttpBody::default());
*res.status_mut() = StatusCode::SWITCHING_PROTOCOLS;
*res.version_mut() = req_ver;
res.headers_mut()
.append(CONNECTION, HeaderValue::from_static("Upgrade"));
res.headers_mut()
.append(UPGRADE, HeaderValue::from_static("websocket"));
res.headers_mut().append(SEC_WEBSOCKET_ACCEPT, derived_key.unwrap().parse().unwrap());
Ok(res)
}
async fn accept_ws(mut ws_stream: WebSocketStream<TokioIo<Upgraded>>, incoming_uri: String) {
println!("new ws connection: {}", incoming_uri);
let mut incoming_uri_chars = incoming_uri.chars();
incoming_uri_chars.next();
let tcp_stream = TcpStream::connect(incoming_uri_chars.as_str())
.await
.expect("failed to connect to incoming uri");
let (tcp_read, tcp_write) = tokio::io::split(tcp_stream);
let mut tcp_write = FramedWrite::new(tcp_write, NetworkCodec);
let mut tcp_read = FramedRead::new(tcp_read, NetworkCodec);
loop {
tokio::select! {
event = ws_stream.next() => {
if let Some(Ok(payload)) = event {
print!("event ws {:?} - ", payload);
match payload {
Message::Text(txt) => {
if tcp_write.send(txt.into_bytes()).await.is_ok() {
println!("sent success");
} else {
println!("sent FAILED");
}
}
Message::Binary(bin) => {
if tcp_write.send(bin).await.is_ok() {
println!("sent success");
} else {
println!("sent FAILED");
}
}
Message::Close(_) => {
if tcp_write.close().await.is_ok() {
println!("closed success");
} else {
println!("closed FAILED");
}
break;
}
_ => {
println!("ignored");
}
}
}
},
event = tcp_read.next() => {
if let Some(res) = event {
print!("event tcp - ");
match res {
Ok(buf) => {
if ws_stream.send(Message::Binary(buf)).await.is_ok() {
println!("sent success");
} else {
println!("sent FAILED");
}
}
Err(_) => {
if ws_stream.close(None).await.is_ok() {
println!("closed success");
} else {
println!("closed FAILED");
}
}
}
}
}
}
}
println!("connection closed");
}