520 lines
12 KiB
Rust
520 lines
12 KiB
Rust
use hyper::{
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Body,
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Request,
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Response,
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Server,
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service::{
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make_service_fn,
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service_fn,
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},
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StatusCode,
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};
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use structopt::StructOpt;
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use tokio::{
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net::UdpSocket,
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sync::watch,
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};
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use quic_demo::prelude::*;
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use protocol::PeerId;
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#[derive (Debug, StructOpt)]
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struct Opt {
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#[structopt (long)]
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listen_addr: Option <String>,
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}
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#[tokio::main]
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async fn main () -> anyhow::Result <()> {
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tracing_subscriber::fmt::init ();
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let opt = Opt::from_args ();
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let listen_addr = opt.listen_addr.unwrap_or_else (|| String::from ("0.0.0.0:30380")).parse ()?;
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let (mut incoming, server_cert) = make_server_endpoint (listen_addr)?;
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println! ("Base64 cert: {}", base64::encode (&server_cert));
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tokio::fs::create_dir_all ("ptth_quic_output").await?;
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tokio::fs::write ("ptth_quic_output/quic_server.crt", &server_cert).await?;
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let relay_state = Arc::new (RelayState::default ());
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let make_svc = {
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let relay_state = Arc::clone (&relay_state);
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make_service_fn (move |_conn| {
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let relay_state = Arc::clone (&relay_state);
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async move {
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Ok::<_, String> (service_fn (move |req| {
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let relay_state = Arc::clone (&relay_state);
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handle_http (req, relay_state)
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}))
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}
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})
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};
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let http_addr = SocketAddr::from (([0, 0, 0, 0], 4004));
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let http_server = Server::bind (&http_addr);
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let tcp_port = 30382;
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let tcp_listener = TcpListener::bind (("127.0.0.1", tcp_port)).await?;
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let (_running_tx, running_rx) = watch::channel (true);
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let task_quic_server = {
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let relay_state = Arc::clone (&relay_state);
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tokio::spawn (async move {
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while let Some (conn) = incoming.next ().await {
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let relay_state = Arc::clone (&relay_state);
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// Each new peer QUIC connection gets its own task
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tokio::spawn (async move {
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let active = relay_state.stats.quic.connect ();
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debug! ("QUIC connections: {}", active);
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match handle_quic_connection (Arc::clone (&relay_state), conn).await {
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Ok (_) => (),
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Err (e) => warn! ("handle_quic_connection {:?}", e),
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}
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let active = relay_state.stats.quic.disconnect ();
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debug! ("QUIC connections: {}", active);
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});
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}
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Ok::<_, anyhow::Error> (())
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})
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};
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let task_direc_server = {
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let relay_state = Arc::clone (&relay_state);
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tokio::spawn (async move {
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let sock = UdpSocket::bind("0.0.0.0:30379").await?;
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let mut buf = [0; 2048];
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loop {
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let (len, addr) = sock.recv_from (&mut buf).await?;
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debug! ("{:?} bytes received from {:?}", len, addr);
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let packet = Vec::from_iter ((&buf [0..len]).into_iter ().map (|x| *x));
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{
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let mut direc_cookies = relay_state.direc_cookies.lock ().await;
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if let Some (direc_state) = direc_cookies.remove (&packet) {
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debug! ("Got PTTH_DIREC cookie for {}", direc_state.p2_id);
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direc_state.p2_addr.send (addr).ok ();
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}
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else {
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debug! ("UDP packet didn't match any PTTH_DIREC cookie");
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}
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}
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}
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Ok::<_, anyhow::Error> (())
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})
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};
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let task_http_server = tokio::spawn (async move {
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http_server.serve (make_svc).await?;
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Ok::<_, anyhow::Error> (())
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});
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let task_tcp_server = {
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let relay_state = Arc::clone (&relay_state);
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tokio::spawn (async move {
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while *running_rx.borrow () {
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let (tcp_socket, _) = tcp_listener.accept ().await?;
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let relay_state = Arc::clone (&relay_state);
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tokio::spawn (async move {
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let (_client_recv, _client_send) = tcp_socket.into_split ();
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debug! ("Accepted direct TCP connection P1 --> P3");
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let p4_server_proxies = relay_state.p4_server_proxies.lock ().await;
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let _p4 = match p4_server_proxies.get ("bogus_server") {
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Some (x) => x,
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None => bail! ("That server isn't connected"),
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};
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// unimplemented! ();
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/*
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p4.req_channel.send (RequestP2ToP4 {
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client_send,
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client_recv,
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client_id: "bogus_client".to_string (),
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}).await.map_err (|_| anyhow::anyhow! ("Can't send request to P4 server"))?;
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*/
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Ok (())
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});
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}
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Ok::<_, anyhow::Error> (())
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})
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};
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debug! ("Serving HTTP on {:?}", http_addr);
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task_quic_server.await??;
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task_http_server.await??;
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task_tcp_server.await??;
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task_direc_server.await??;
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Ok (())
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}
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async fn handle_http (_req: Request <Body>, relay_state: Arc <RelayState>)
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-> anyhow::Result <Response <Body>>
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{
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let debug_string;
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{
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let p4_server_proxies = relay_state.p4_server_proxies.lock ().await;
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debug_string = format! ("{:#?}\n", p4_server_proxies.keys ().collect::<Vec<_>> ());
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}
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let resp = Response::builder ()
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.status (StatusCode::OK)
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.header ("content-type", "text/plain")
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.body (Body::from (debug_string))?;
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Ok (resp)
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}
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#[derive (Default)]
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struct RelayState {
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p4_server_proxies: Mutex <HashMap <PeerId, P4State>>,
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direc_cookies: Mutex <HashMap <Vec <u8>, DirecState>>,
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stats: Stats,
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}
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struct DirecState {
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start_time: Instant,
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p2_id: PeerId,
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p2_addr: tokio::sync::oneshot::Sender <SocketAddr>,
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}
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#[derive (Default)]
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struct Stats {
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quic: ConnectEvents,
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}
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#[derive (Default)]
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struct ConnectEvents {
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connects: AtomicU64,
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disconnects: AtomicU64,
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}
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impl ConnectEvents {
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fn connect (&self) -> u64 {
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let connects = self.connects.fetch_add (1, Ordering::Relaxed) + 1;
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let disconnects = self.disconnects.load (Ordering::Relaxed);
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connects - disconnects
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}
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fn disconnect (&self) -> u64 {
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let disconnects = self.disconnects.fetch_add (1, Ordering::Relaxed) + 1;
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let connects = self.connects.load (Ordering::Relaxed);
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connects - disconnects
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}
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fn _active (&self) -> u64 {
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let connects = self.connects.load (Ordering::Relaxed);
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let disconnects = self.disconnects.load (Ordering::Relaxed);
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connects - disconnects
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}
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}
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struct P4State {
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req_channel: mpsc::Sender <RequestP2ToP4>,
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}
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impl RelayState {
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}
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struct RequestP2ToP4 {
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client_send: quinn::SendStream,
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client_recv: quinn::RecvStream,
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client_id: String,
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}
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struct PtthNewConnection {
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client_send: quinn::SendStream,
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client_recv: quinn::RecvStream,
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server_send: quinn::SendStream,
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server_recv: quinn::RecvStream,
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}
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struct PtthConnection {
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uplink_task: JoinHandle <anyhow::Result <()>>,
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downlink_task: JoinHandle <anyhow::Result <()>>,
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}
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impl PtthNewConnection {
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fn build (self) -> PtthConnection {
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let Self {
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mut client_send,
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mut client_recv,
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mut server_send,
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mut server_recv,
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} = self;
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let uplink_task = tokio::spawn (async move {
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// Uplink - Client to end server
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let mut buf = vec! [0u8; 65_536];
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while let Some (bytes_read) = client_recv.read (&mut buf).await? {
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if bytes_read == 0 {
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break;
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}
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let buf_slice = &buf [0..bytes_read];
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trace! ("Uplink relaying {} bytes", bytes_read);
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server_send.write_all (buf_slice).await?;
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}
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trace! ("Uplink closed");
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Ok::<_, anyhow::Error> (())
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});
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let downlink_task = tokio::spawn (async move {
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// Downlink - End server to client
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let mut buf = vec! [0u8; 65_536];
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while let Some (bytes_read) = server_recv.read (&mut buf).await? {
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let buf_slice = &buf [0..bytes_read];
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trace! ("Downlink relaying {} bytes", bytes_read);
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client_send.write_all (buf_slice).await?;
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}
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trace! ("Downlink closed");
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Ok::<_, anyhow::Error> (())
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});
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PtthConnection {
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uplink_task,
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downlink_task,
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}
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}
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}
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async fn handle_quic_connection (
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relay_state: Arc <RelayState>,
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conn: quinn::Connecting,
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) -> anyhow::Result <()>
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{
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let mut conn = conn.await?;
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// Everyone who connects must identify themselves with the first
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// bi stream
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// TODO: Timeout
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let (mut send, mut recv) = conn.bi_streams.next ().await.ok_or_else (|| anyhow::anyhow! ("QUIC client didn't identify itself"))??;
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let peer = protocol::p3_accept_peer (&mut recv).await?;
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match peer {
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protocol::P3Peer::P2ClientProxy (peer) => {
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// TODO: Check authorization for P2 peers
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protocol::p3_authorize_p2_peer (&mut send).await?;
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handle_p2_connection (relay_state, conn, peer).await?;
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},
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protocol::P3Peer::P4ServerProxy (peer) => {
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// TODO: Check authorization for P2 peers
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protocol::p3_authorize_p4_peer (&mut send).await?;
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handle_p4_connection (relay_state, conn, peer).await?;
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},
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}
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Ok::<_, anyhow::Error> (())
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}
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async fn handle_p2_connection (
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relay_state: Arc <RelayState>,
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conn: quinn::NewConnection,
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peer: protocol::P2ClientProxy,
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) -> anyhow::Result <()>
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{
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let client_id = peer.id;
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let quinn::NewConnection {
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mut bi_streams,
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..
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} = conn;
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while let Some (bi_stream) = bi_streams.next ().await {
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let (send, mut recv) = bi_stream?;
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let relay_state = Arc::clone (&relay_state);
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let client_id = client_id.clone ();
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tokio::spawn (async move {
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debug! ("Request started for P2");
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match protocol::p3_accept_p2_stream (&mut recv).await? {
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protocol::P2ToP3Stream::ConnectP2ToP4 {
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server_id,
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} => {
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handle_request_p2_to_p4 (
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relay_state,
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client_id,
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server_id,
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send,
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recv
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).await?
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},
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protocol::P2ToP3Stream::DirecP2ToP4 {
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server_id,
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cookie,
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} => {
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handle_direc_p2_to_p4 (
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relay_state,
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client_id,
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server_id,
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cookie,
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send,
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recv
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).await?
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},
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}
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debug! ("Request ended for P2");
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Ok::<_, anyhow::Error> (())
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});
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}
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debug! ("P2 {} disconnected", client_id);
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Ok (())
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}
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async fn handle_request_p2_to_p4 (
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relay_state: Arc <RelayState>,
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client_id: String,
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server_id: PeerId,
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mut client_send: quinn::SendStream,
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client_recv: quinn::RecvStream,
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) -> anyhow::Result <()>
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{
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trace! ("P2 {} wants to connect to P4 {}", client_id, server_id);
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// TODO: Check authorization for P2 to connect to P4
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protocol::p3_authorize_p2_to_p4_connection (&mut client_send).await?;
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{
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let p4_server_proxies = relay_state.p4_server_proxies.lock ().await;
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match p4_server_proxies.get (&server_id) {
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Some (p4_state) => {
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p4_state.req_channel.send (RequestP2ToP4 {
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client_send,
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client_recv,
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client_id,
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}).await.map_err (|_| anyhow::anyhow! ("Can't send request to P4 server"))?;
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},
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None => warn! ("That server isn't connected"),
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}
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}
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Ok (())
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}
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async fn handle_direc_p2_to_p4 (
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relay_state: Arc <RelayState>,
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client_id: String,
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server_id: PeerId,
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cookie: Vec <u8>,
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mut client_send: quinn::SendStream,
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client_recv: quinn::RecvStream,
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) -> anyhow::Result <()>
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{
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debug! ("P2 {} wants a P2P connection to P4 {}", client_id, server_id);
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// TODO: Check authorization
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protocol::p3_authorize_p2_to_p4_direc (&mut client_send).await?;
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let (tx, rx) = tokio::sync::oneshot::channel ();
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{
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let mut direc_cookies = relay_state.direc_cookies.lock ().await;
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direc_cookies.insert (cookie, DirecState {
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start_time: Instant::now (),
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p2_id: client_id.clone (),
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p2_addr: tx,
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});
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}
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debug! ("Waiting to learn P2's WAN address...");
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let wan_addr = rx.await?;
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debug! ("And that WAN address is {}", wan_addr);
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Ok (())
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}
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async fn handle_p4_connection (
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relay_state: Arc <RelayState>,
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conn: quinn::NewConnection,
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peer: protocol::P4ServerProxy,
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) -> anyhow::Result <()>
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{
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let server_id = peer.id;
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let quinn::NewConnection {
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connection,
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..
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} = conn;
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let (tx, mut rx) = mpsc::channel (2);
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let p4_state = P4State {
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req_channel: tx,
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};
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{
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let mut p4_server_proxies = relay_state.p4_server_proxies.lock ().await;
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p4_server_proxies.insert (server_id.clone (), p4_state);
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}
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while let Some (req) = rx.recv ().await {
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let connection = connection.clone ();
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let server_id = server_id.clone ();
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tokio::spawn (async move {
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let RequestP2ToP4 {
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client_send,
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client_recv,
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client_id,
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} = req;
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debug! ("P4 {} got a request from P2 {}", server_id, client_id);
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let (server_send, server_recv) = protocol::p3_connect_p2_to_p4 (&connection, &client_id).await?;
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trace! ("Relaying bytes...");
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let ptth_conn = PtthNewConnection {
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client_send,
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client_recv,
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server_send,
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server_recv,
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}.build ();
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ptth_conn.uplink_task.await??;
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ptth_conn.downlink_task.await??;
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debug! ("Request ended for P4");
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Ok::<_, anyhow::Error> (())
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});
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}
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debug! ("P4 {} disconnected", server_id);
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Ok (())
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}
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