111 lines
3.4 KiB
Rust
111 lines
3.4 KiB
Rust
#![deny(warnings)]
|
|
|
|
use std::convert::Infallible;
|
|
use std::net::SocketAddr;
|
|
|
|
use hyper::service::{make_service_fn, service_fn};
|
|
use hyper::upgrade::Upgraded;
|
|
use hyper::{Body, Client, Method, Request, Response, Server};
|
|
|
|
use tokio::net::TcpStream;
|
|
|
|
type HttpClient = Client<hyper::client::HttpConnector>;
|
|
|
|
// To try this example:
|
|
// 1. cargo run --example http_proxy
|
|
// 2. config http_proxy in command line
|
|
// $ export http_proxy=http://127.0.0.1:8100
|
|
// $ export https_proxy=http://127.0.0.1:8100
|
|
// 3. send requests
|
|
// $ curl -i https://www.some_domain.com/
|
|
#[tokio::main]
|
|
async fn main() {
|
|
let addr = SocketAddr::from(([127, 0, 0, 1], 8100));
|
|
|
|
let client = Client::builder()
|
|
.http1_title_case_headers(true)
|
|
.http1_preserve_header_case(true)
|
|
.build_http();
|
|
|
|
let make_service = make_service_fn(move |_| {
|
|
let client = client.clone();
|
|
async move { Ok::<_, Infallible>(service_fn(move |req| proxy(client.clone(), req))) }
|
|
});
|
|
|
|
let server = Server::bind(&addr)
|
|
.http1_preserve_header_case(true)
|
|
.http1_title_case_headers(true)
|
|
.serve(make_service);
|
|
|
|
println!("Listening on http://{}", addr);
|
|
|
|
if let Err(e) = server.await {
|
|
eprintln!("server error: {}", e);
|
|
}
|
|
}
|
|
|
|
async fn proxy(client: HttpClient, req: Request<Body>) -> Result<Response<Body>, hyper::Error> {
|
|
println!("req: {:?}", req);
|
|
|
|
if Method::CONNECT == req.method() {
|
|
// Received an HTTP request like:
|
|
// ```
|
|
// CONNECT www.domain.com:443 HTTP/1.1
|
|
// Host: www.domain.com:443
|
|
// Proxy-Connection: Keep-Alive
|
|
// ```
|
|
//
|
|
// When HTTP method is CONNECT we should return an empty body
|
|
// then we can eventually upgrade the connection and talk a new protocol.
|
|
//
|
|
// Note: only after client received an empty body with STATUS_OK can the
|
|
// connection be upgraded, so we can't return a response inside
|
|
// `on_upgrade` future.
|
|
if let Some(addr) = host_addr(req.uri()) {
|
|
tokio::task::spawn(async move {
|
|
match hyper::upgrade::on(req).await {
|
|
Ok(upgraded) => {
|
|
if let Err(e) = tunnel(upgraded, addr).await {
|
|
eprintln!("server io error: {}", e);
|
|
};
|
|
}
|
|
Err(e) => eprintln!("upgrade error: {}", e),
|
|
}
|
|
});
|
|
|
|
Ok(Response::new(Body::empty()))
|
|
} else {
|
|
eprintln!("CONNECT host is not socket addr: {:?}", req.uri());
|
|
let mut resp = Response::new(Body::from("CONNECT must be to a socket address"));
|
|
*resp.status_mut() = http::StatusCode::BAD_REQUEST;
|
|
|
|
Ok(resp)
|
|
}
|
|
} else {
|
|
client.request(req).await
|
|
}
|
|
}
|
|
|
|
fn host_addr(uri: &http::Uri) -> Option<String> {
|
|
uri.authority().and_then(|auth| Some(auth.to_string()))
|
|
}
|
|
|
|
// Create a TCP connection to host:port, build a tunnel between the connection and
|
|
// the upgraded connection
|
|
async fn tunnel(mut upgraded: Upgraded, addr: String) -> std::io::Result<()> {
|
|
// Connect to remote server
|
|
let mut server = TcpStream::connect(addr).await?;
|
|
|
|
// Proxying data
|
|
let (from_client, from_server) =
|
|
tokio::io::copy_bidirectional(&mut upgraded, &mut server).await?;
|
|
|
|
// Print message when done
|
|
println!(
|
|
"client wrote {} bytes and received {} bytes",
|
|
from_client, from_server
|
|
);
|
|
|
|
Ok(())
|
|
}
|