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|
pub mod config;
use crate::config::Config;
use anyhow::{bail, Context, Result};
use bytes::Bytes;
use http_body_util::{combinators::BoxBody, BodyExt, Empty};
use hyper::{
body::Incoming, header::UPGRADE, http::uri::PathAndQuery, server::conn::http1,
service::service_fn, upgrade::OnUpgrade, Method, Request, Response, StatusCode, Uri,
};
use log::{debug, error, info, warn};
use std::{fs::File, io::BufReader, path::Path, sync::Arc};
use tokio::{
io::{AsyncRead, AsyncWrite},
net::{TcpListener, TcpStream},
};
use tokio_rustls::TlsAcceptor;
#[tokio::main]
async fn main() -> anyhow::Result<()> {
env_logger::init_from_env("LOG");
let config = Arc::new(Config::load()?);
tokio::select! {
x = serve_http(config.clone()) => x.context("serving http")?,
x = serve_https(config.clone()) => x.context("serving https")?,
};
Ok(())
}
async fn serve_http(config: Arc<Config>) -> Result<()> {
let http_config = match &config.http {
Some(n) => n,
None => return Ok(()),
};
let listener = TcpListener::bind(http_config.bind).await?;
info!("serving http");
loop {
let (stream, addr) = listener.accept().await.context("accepting connection")?;
debug!("connection from {addr}");
serve_stream(config.clone(), stream)
}
}
async fn serve_https(config: Arc<Config>) -> Result<()> {
let https_config = match &config.https {
Some(n) => n,
None => return Ok(()),
};
let tls_config = {
let certs = load_certs(&https_config.tls_cert)?;
let key = load_private_key(&https_config.tls_key)?;
let mut cfg = rustls::ServerConfig::builder()
.with_safe_defaults()
.with_no_client_auth()
.with_single_cert(certs, key)?;
cfg.alpn_protocols = vec![
// b"h2".to_vec(),
b"http/1.1".to_vec(),
];
Arc::new(cfg)
};
let listener = TcpListener::bind(https_config.bind).await?;
let tls_acceptor = TlsAcceptor::from(tls_config);
info!("serving https");
loop {
let (stream, addr) = listener.accept().await.context("accepting connection")?;
debug!("connection from {addr}");
let stream = tls_acceptor.accept(stream).await.context("accepting tls")?;
serve_stream(config.clone(), stream)
}
}
pub fn serve_stream<T: AsyncRead + AsyncWrite + Unpin + Send + 'static>(
config: Arc<Config>,
stream: T,
) {
tokio::task::spawn(async move {
let conn = http1::Builder::new()
.serve_connection(
stream,
service_fn(move |req| {
let config = config.clone();
async move {
match service(config, req).await {
Ok(r) => Ok(r),
Err(ServiceError::Hyper(e)) => Err(e),
Err(other) => Ok(Response::new(format!(
"the reverse proxy encountered an error: {other:?}"
))
.map(|b| b.map_err(|e| match e {}).boxed())),
}
}
}),
)
.with_upgrades();
if let Err(err) = conn.await {
error!("error: {:?}", err);
}
});
}
fn load_certs(path: &Path) -> anyhow::Result<Vec<rustls::Certificate>> {
let mut reader = BufReader::new(File::open(path).context("reading tls certs")?);
let certs = rustls_pemfile::certs(&mut reader).context("parsing tls certs")?;
Ok(certs.into_iter().map(rustls::Certificate).collect())
}
fn load_private_key(path: &Path) -> anyhow::Result<rustls::PrivateKey> {
let mut reader = BufReader::new(File::open(path).context("reading tls private key")?);
let keys =
rustls_pemfile::pkcs8_private_keys(&mut reader).context("parsing tls private key")?;
if keys.len() != 1 {
bail!("expected a single private key, found {}", keys.len())
}
Ok(rustls::PrivateKey(keys[0].clone()))
}
#[derive(Debug)]
enum ServiceError {
Hyper(hyper::Error),
NoHost,
CantConnect,
}
async fn service(
config: Arc<Config>,
mut req: Request<Incoming>,
) -> Result<hyper::Response<BoxBody<bytes::Bytes, hyper::Error>>, ServiceError> {
*req.uri_mut() = Uri::builder()
.scheme("http")
.authority("backend")
.path_and_query(
req.uri()
.clone()
.path_and_query()
.cloned()
.unwrap_or(PathAndQuery::from_static("/")),
)
.build()
.unwrap();
let route = config
.hosts
.get(remove_port(
&req.headers()
.get("host")
.and_then(|e| e.to_str().ok())
.map(String::from)
.unwrap_or(String::from("")),
))
.ok_or(ServiceError::NoHost)?;
let upgrade_header = req.headers().get(UPGRADE).cloned();
let on_upgrade_downstream = req.extensions_mut().remove::<OnUpgrade>();
let mut resp = {
let client_stream = TcpStream::connect(&route.backend)
.await
.map_err(|_| ServiceError::CantConnect)?;
let (mut sender, conn) = hyper::client::conn::http1::handshake(client_stream)
.await
.map_err(ServiceError::Hyper)?;
tokio::task::spawn(async move {
if let Err(err) = conn.await {
warn!("connection failed: {:?}", err);
}
});
sender
.send_request(req)
.await
.map_err(ServiceError::Hyper)?
};
if let Some(proto) = upgrade_header {
let on_upgrade_upstream = resp.extensions_mut().remove::<OnUpgrade>();
tokio::task::spawn(async move {
debug!("about upgrading connection, sending empty response");
match (
on_upgrade_upstream.unwrap().await,
on_upgrade_downstream.unwrap().await,
) {
(Ok(mut upgraded_upstream), Ok(mut upgraded_downstream)) => {
debug!("upgrade successful");
match tokio::io::copy_bidirectional(
&mut upgraded_downstream,
&mut upgraded_upstream,
)
.await
{
Ok((from_client, from_server)) => {
debug!("proxy socket terminated: {from_server} sent, {from_client} received")
}
Err(e) => warn!("proxy socket error: {e}"),
}
}
(a, b) => eprintln!("upgrade error: upstream={a:?} downstream={b:?}"),
}
});
let mut resp = Response::new(Empty::<Bytes>::new());
*resp.status_mut() = StatusCode::SWITCHING_PROTOCOLS;
resp.headers_mut().insert(UPGRADE, proto);
Ok(resp.map(|b| b.map_err(|e| match e {}).boxed()))
} else {
Ok(resp.map(|b| b.boxed()))
}
}
pub fn remove_port(s: &str) -> &str {
s.split_once(":").map(|(s, _)| s).unwrap_or(s)
}
|
