119 lines
3.8 KiB
Rust
119 lines
3.8 KiB
Rust
#![deny(warnings)]
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use std::convert::Infallible;
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use std::net::SocketAddr;
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use futures_util::future::try_join;
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use hyper::service::{make_service_fn, service_fn};
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use hyper::upgrade::Upgraded;
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use hyper::{Body, Client, Method, Request, Response, Server};
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use tokio::net::TcpStream;
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type HttpClient = Client<hyper::client::HttpConnector>;
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// To try this example:
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// 1. cargo run --example http_proxy
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// 2. config http_proxy in command line
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// $ export http_proxy=http://127.0.0.1:8100
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// $ export https_proxy=http://127.0.0.1:8100
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// 3. send requests (don't use a domain name)
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// $ curl -i https://8.8.8.8
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#[tokio::main]
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async fn main() {
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let addr = SocketAddr::from(([127, 0, 0, 1], 8100));
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let client = HttpClient::new();
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let make_service = make_service_fn(move |_| {
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let client = client.clone();
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async move { Ok::<_, Infallible>(service_fn(move |req| proxy(client.clone(), req))) }
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});
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let server = Server::bind(&addr).serve(make_service);
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println!("Listening on http://{}", addr);
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if let Err(e) = server.await {
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eprintln!("server error: {}", e);
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}
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}
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async fn proxy(client: HttpClient, req: Request<Body>) -> Result<Response<Body>, hyper::Error> {
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println!("req: {:?}", req);
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if Method::CONNECT == req.method() {
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// Received an HTTP request like:
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// ```
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// CONNECT www.domain.com:443 HTTP/1.1
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// Host: www.domain.com:443
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// Proxy-Connection: Keep-Alive
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// ```
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//
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// When HTTP method is CONNECT we should return an empty body
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// then we can eventually upgrade the connection and talk a new protocol.
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//
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// Note: only after client received an empty body with STATUS_OK can the
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// connection be upgraded, so we can't return a response inside
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// `on_upgrade` future.
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if let Some(addr) = host_addr(req.uri()) {
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tokio::task::spawn(async move {
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match req.into_body().on_upgrade().await {
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Ok(upgraded) => {
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if let Err(e) = tunnel(upgraded, addr).await {
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eprintln!("server io error: {}", e);
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};
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}
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Err(e) => eprintln!("upgrade error: {}", e),
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}
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});
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Ok(Response::new(Body::empty()))
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} else {
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eprintln!("CONNECT host is not socket addr: {:?}", req.uri());
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let mut resp = Response::new(Body::from("CONNECT must be to a socket address"));
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*resp.status_mut() = http::StatusCode::BAD_REQUEST;
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Ok(resp)
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}
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} else {
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client.request(req).await
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}
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}
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fn host_addr(uri: &http::Uri) -> Option<SocketAddr> {
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uri.authority().and_then(|auth| auth.as_str().parse().ok())
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}
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// Create a TCP connection to host:port, build a tunnel between the connection and
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// the upgraded connection
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async fn tunnel(upgraded: Upgraded, addr: SocketAddr) -> std::io::Result<()> {
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// Connect to remote server
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let mut server = TcpStream::connect(addr).await?;
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// Proxying data
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let amounts = {
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let (mut server_rd, mut server_wr) = server.split();
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let (mut client_rd, mut client_wr) = tokio::io::split(upgraded);
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let client_to_server = tokio::io::copy(&mut client_rd, &mut server_wr);
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let server_to_client = tokio::io::copy(&mut server_rd, &mut client_wr);
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try_join(client_to_server, server_to_client).await
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};
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// Print message when done
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match amounts {
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Ok((from_client, from_server)) => {
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println!(
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"client wrote {} bytes and received {} bytes",
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from_client, from_server
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);
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}
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Err(e) => {
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println!("tunnel error: {}", e);
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}
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};
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Ok(())
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}
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