⭐ use udp_over_tcp for both PTTH_QUIC end server and relay server

- `cargo run -p ptth_quic --bin ptth_quic_relay_server -- --tcp-listen-port 4440`
- `cargo run -p ptth_quic --bin ptth_quic_end_server -- --use-udp-over-tcp true --relay-addr 127.0.0.1:4440 --server-id my_server`
- `cargo run -p ptth_quic_client_gui -- --client-id me`
- `nc -l -p 5900`
- (Open my_server, 5900 in the client GUI)
- `nc 127.0.0.1 50369` (or whatever port the GUI picked)

crates/ptth_quic/src/executable_end_server.rs

@@ -19,6 +19,8 @@ struct Opt {
 	debug_echo: bool,
 	#[structopt (long)]
 	cert_url: Option <String>,
+	#[structopt (long)]
+	use_udp_over_tcp: Option <bool>,
 }
 
 pub async fn main (args: &[OsString], shutdown_rx: Option <watch::Receiver <bool>>) -> anyhow::Result <()> {
@@ -26,12 +28,37 @@ pub async fn main (args: &[OsString], shutdown_rx: Option <watch::Receiver <bool
 	let opt = Opt::from_iter (args);
 	let conf = opt.into_config ().await?;
 	
-	let end_server = Arc::new (P4EndServer::connect (conf)?);
+	let end_server = Arc::new (P4EndServer::connect (&conf)?);
+	
+	let conf = if conf.use_udp_over_tcp {
+		let udp_sock = UdpSocket::bind (SocketAddrV4::new (Ipv4Addr::UNSPECIFIED, 0)).await?;
+		udp_sock.connect ((Ipv4Addr::LOCALHOST, end_server.endpoint.local_addr ()?.port ())).await?;
+		
+		let udp_local_server_port = udp_sock.local_addr ()?.port ();
+		
+		let tcp_sock = TcpSocket::new_v4 ()?;
+		let tcp_conn = tcp_sock.connect (conf.relay_addr).await?;
+		
+		tokio::spawn (async move {
+			udp_over_tcp::client::main_with_sockets (udp_sock, tcp_conn).await
+		});
+		
+		Config {
+			debug_echo: conf.debug_echo,
+			id: conf.id,
+			relay_addr: SocketAddr::V4 (SocketAddrV4::new (Ipv4Addr::LOCALHOST, udp_local_server_port)),
+			relay_cert: conf.relay_cert,
+			use_udp_over_tcp: true,
+		}
+	}
+	else {
+		conf
+	};
 	
 	let run_task = {
 		let end_server = Arc::clone (&end_server);
 		tokio::spawn (async move {
-			end_server.run ().await?;
+			end_server.run (conf).await?;
 			Ok::<_, anyhow::Error> (())
 		})
 	};
@@ -57,6 +84,7 @@ pub struct Config {
 	pub id: String,
 	pub relay_addr: SocketAddr,
 	pub relay_cert: Vec <u8>,
+	pub use_udp_over_tcp: bool,
 }
 
 impl Opt {
@@ -83,45 +111,42 @@ impl Opt {
 			id,
 			relay_addr,
 			relay_cert,
+			use_udp_over_tcp: self.use_udp_over_tcp.unwrap_or (false),
 		})
 	}
 }
 
 pub struct P4EndServer {
 	endpoint: quinn::Endpoint,
-	conf: Arc <Config>,
 	shutdown_tx: watch::Sender <bool>,
 	shutdown_rx: watch::Receiver <bool>,
 }
 
 impl P4EndServer {
-	pub fn connect (conf: Config) -> anyhow::Result <Self> {
+	pub fn connect (conf: &Config) -> anyhow::Result <Self> {
 		trace! ("P4 end server making its QUIC endpoint");
 		let endpoint = make_client_endpoint ("0.0.0.0:0".parse ()?, &[&conf.relay_cert])?;
 		
 		let (shutdown_tx, shutdown_rx) = watch::channel (false);
 		
 		Ok (P4EndServer {
-			conf: Arc::new (conf),
 			endpoint,
 			shutdown_tx,
 			shutdown_rx,
 		})
 	}
 	
-	pub fn config (&self) -> &Config {
-		&*self.conf
-	}
+	pub async fn run (&self, conf: Config) -> anyhow::Result <()> {
+		let conf = Arc::new (conf);
 		
-	pub async fn run (&self) -> anyhow::Result <()> {
 		trace! ("P4 end server connecting to P3 relay server");
 		let quinn::NewConnection {
 			mut bi_streams,
 			..
 		} = protocol::p4_connect_to_p3 (
 			&self.endpoint, 
-			self.conf.relay_addr, 
-			&self.conf.id
+			conf.relay_addr, 
+			&conf.id
 		).await?;
 		
 		debug! ("Connected to relay server");
@@ -141,7 +166,7 @@ impl P4EndServer {
 				stream_opt = bi_streams.next () => {
 					let (relay_send, relay_recv) = stream_opt.ok_or_else (|| anyhow::anyhow! ("P4 ran out of incoming streams. Maybe P3 shut down or disconnected?"))??;
 					
-					tokio::spawn (handle_bi_stream (Arc::clone (&self.conf), relay_send, relay_recv));
+					tokio::spawn (handle_bi_stream (Arc::clone (&conf), relay_send, relay_recv));
 				}
 			};
 		}

crates/ptth_quic/src/executable_relay_server.rs

@@ -115,22 +115,18 @@ pub async fn main (opt: Opt) -> anyhow::Result <()>
 	
 	debug! ("Serving HTTP on {:?}", http_addr);
 	
-	let task_tcp_over_udp_server = if let Some (tcp_listen_port) = opt.tcp_listen_port {
+	if let Some (tcp_listen_port) = opt.tcp_listen_port {
 		tokio::spawn (async move {
 			let cfg = udp_over_tcp::server::Config {
 				tcp_port: tcp_listen_port,
 				udp_port: listen_addr.port (),
 			};
-			udp_over_tcp::server::main (cfg).await
-		})
-	}
-	else {
-		tokio::spawn (async move {
-			loop {
-				tokio::time::sleep (Duration::from_secs (3_600)).await;
+			
+			if let Err (e) = udp_over_tcp::server::main (cfg).await {
+				eprintln! ("udp_over_tcp::server::main exited with err {:?}", e);
 			}
-		})
-	};
+		});
+	}
 	
 	tokio::select! {
 		_val = task_quic_server => {
@@ -142,9 +138,6 @@ pub async fn main (opt: Opt) -> anyhow::Result <()>
 		_val = task_direc_server => {
 			eprintln! ("PTTH_DIREC server exited, exiting");
 		},
-		_val = task_tcp_over_udp_server => {
-			eprintln! ("tcp_over_udp server exited, exiting");
-		}
 	}
 	
 	Ok (())

crates/ptth_quic/src/prelude.rs

@@ -2,7 +2,11 @@ pub use std::{
 	collections::*,
 	ffi::OsString,
 	iter::FromIterator,
-	net::SocketAddr,
+	net::{
+		Ipv4Addr,
+		SocketAddr,
+		SocketAddrV4,
+	},
 	sync::{
 		Arc,
 		atomic::{
@@ -26,7 +30,11 @@ pub use tokio::{
 		AsyncReadExt,
 		AsyncWriteExt,
 	},
-	net::TcpListener,
+	net::{
+		TcpListener,
+		TcpSocket,
+		UdpSocket,
+	},
 	sync::{
 		Mutex,
 		mpsc,

crates/udp_over_tcp/src/client.rs

@@ -10,6 +10,7 @@ use std::{
 use tokio::{
 	net::{
 		TcpSocket,
+		TcpStream,
 		UdpSocket,
 	},
 	spawn,
@@ -29,6 +30,11 @@ pub async fn main (cfg: Config) -> anyhow::Result <()> {
 	
 	let tcp_sock = TcpSocket::new_v4 ()?;
 	let tcp_conn = tcp_sock.connect (cfg.tcp_server_addr).await?;
+	
+	main_with_sockets (udp_sock, tcp_conn).await
+}
+
+pub async fn main_with_sockets (udp_sock: UdpSocket, tcp_conn: TcpStream) -> anyhow::Result <()> {
 	let (tcp_read, tcp_write) = tcp_conn.into_split ();
 	
 	let tx_task;