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/*
This file is part of gnix (https://codeberg.org/metamuffin/gnix)
which is licensed under the GNU Affero General Public License (version 3); see /COPYING.
Copyright (C) 2025 metamuffin <metamuffin.org>
*/
use super::{Node, NodeContext, NodeKind, NodeRequest, NodeResponse};
use crate::ServiceError;
use futures::Future;
use http::{Response, Version};
use http_body_util::BodyExt;
use hyper::{body::Incoming, http::HeaderValue, upgrade::OnUpgrade, StatusCode};
use hyper_util::rt::TokioIo;
use log::{debug, warn};
use serde::Deserialize;
use serde_yml::Value;
use std::{
fmt::Display,
net::{Ipv4Addr, SocketAddr, SocketAddrV4},
path::PathBuf,
pin::Pin,
str::FromStr,
sync::Arc,
};
use tokio::{
io::{AsyncRead, AsyncWrite},
net::{TcpStream, UnixStream},
};
#[derive(Default)]
pub struct ProxyKind;
#[derive(Debug, Deserialize)]
struct Proxy {
#[serde(default)]
set_forwarded_for: bool,
#[serde(default = "ret_true")]
set_real_ip: bool,
backend: SocketAddrOrPath,
}
#[derive(Debug)]
enum SocketAddrOrPath {
Ip(SocketAddr),
Unix(PathBuf),
}
fn ret_true() -> bool {
true
}
impl NodeKind for ProxyKind {
fn name(&self) -> &'static str {
"proxy"
}
fn instanciate(&self, config: Value) -> anyhow::Result<Arc<dyn Node>> {
Ok(Arc::new(serde_yml::from_value::<Proxy>(config)?))
}
}
impl<'de> Deserialize<'de> for SocketAddrOrPath {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: serde::Deserializer<'de>,
{
let s = String::deserialize(deserializer)?;
if s.starts_with("/") {
Ok(Self::Unix(PathBuf::from_str(&s).map_err(|e| match e {})?))
} else if let Some(port) = s.strip_prefix(":") {
Ok(Self::Ip(SocketAddr::V4(SocketAddrV4::new(
Ipv4Addr::LOCALHOST,
port.parse().map_err(serde::de::Error::custom)?,
))))
} else {
Ok(Self::Ip(
SocketAddr::from_str(&s).map_err(serde::de::Error::custom)?,
))
}
}
}
impl Display for SocketAddrOrPath {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
SocketAddrOrPath::Ip(addr) => write!(f, "{addr}"),
SocketAddrOrPath::Unix(path) => write!(f, "unix:{}", path.to_string_lossy()),
}
}
}
impl Node for Proxy {
fn handle<'a>(
&'a self,
context: &'a mut NodeContext,
mut request: NodeRequest,
) -> Pin<Box<dyn Future<Output = Result<NodeResponse, ServiceError>> + Send + Sync + 'a>> {
Box::pin(async move {
*request.version_mut() = Version::HTTP_11; // totally not a lie
if self.set_real_ip {
request.headers_mut().insert(
"x-real-ip",
HeaderValue::from_str(&format!("{}", context.addr.ip())).unwrap(),
);
}
if self.set_forwarded_for {
request.headers_mut().insert(
"x-forwarded-for",
HeaderValue::from_str(&format!("{}", context.addr.ip())).unwrap(),
);
request.headers_mut().insert(
"x-forwarded-port",
HeaderValue::from_str(&context.listen_addr.port().to_string()).unwrap(),
);
let scheme =
HeaderValue::from_str(if context.secure { "https" } else { "http" }).unwrap();
request
.headers_mut()
.insert("x-forwarded-scheme", scheme.clone());
request.headers_mut().insert("x-forwarded-proto", scheme);
if let Some(host) = request.headers().get("host").cloned() {
request.headers_mut().insert("x-forwarded-host", host);
}
}
let on_upgrade_downstream = request.extensions_mut().remove::<OnUpgrade>();
let _limit_guard = context.state.l_outgoing.try_acquire()?;
debug!("\tforwarding to {}", self.backend);
let mut resp = {
#[inline]
async fn send_request<T: AsyncWrite + AsyncRead + Unpin + Send + 'static>(
stream: T,
request: NodeRequest,
) -> Result<Response<Incoming>, ServiceError> {
let client_stream = TokioIo::new(stream);
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.with_upgrades().await {
warn!("connection failed: {:?}", err);
}
});
sender
.send_request(request)
.await
.map_err(ServiceError::Hyper)
}
match &self.backend {
SocketAddrOrPath::Ip(socket_addr) => {
send_request(
TcpStream::connect(socket_addr)
.await
.map_err(|_| ServiceError::CantConnect)?,
request,
)
.await?
}
SocketAddrOrPath::Unix(path) => {
send_request(
UnixStream::connect(path)
.await
.map_err(|_| ServiceError::CantConnect)?,
request,
)
.await?
}
}
};
if resp.status() == StatusCode::SWITCHING_PROTOCOLS {
let on_upgrade_upstream = resp
.extensions_mut()
.remove::<OnUpgrade>()
.ok_or(ServiceError::UpgradeFailed)?;
let on_upgrade_downstream =
on_upgrade_downstream.ok_or(ServiceError::UpgradeFailed)?;
tokio::task::spawn(async move {
debug!("about to upgrade connection");
match (on_upgrade_upstream.await, on_upgrade_downstream.await) {
(Ok(upgraded_upstream), Ok(upgraded_downstream)) => {
debug!("upgrade successful");
match tokio::io::copy_bidirectional(
&mut TokioIo::new(upgraded_downstream),
&mut TokioIo::new(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) => warn!("upgrade error: upstream={a:?} downstream={b:?}"),
}
});
}
let resp = resp.map(|b| b.map_err(ServiceError::Hyper).boxed());
Ok(resp)
})
}
}
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