218 lines
5.4 KiB
Rust
218 lines
5.4 KiB
Rust
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use structopt::StructOpt;
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use tokio::{
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net::TcpStream,
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sync::watch,
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};
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use crate::prelude::*;
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use protocol::PeerId;
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/// A partially-filled-out config that structopt can deal with
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/// Try to turn this into a Config as soon as possible.
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#[derive (Debug, StructOpt)]
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struct Opt {
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#[structopt (long)]
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relay_addr: Option <String>,
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#[structopt (long)]
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server_id: Option <PeerId>,
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#[structopt (long)]
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debug_echo: bool,
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#[structopt (long)]
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cert_url: Option <String>,
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}
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pub async fn main (args: &[OsString], shutdown_rx: Option <watch::Receiver <bool>>) -> anyhow::Result <()> {
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let opt = Opt::from_iter (args);
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let conf = opt.into_config ().await?;
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let end_server = Arc::new (P4EndServer::connect (conf)?);
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let run_task = {
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let end_server = Arc::clone (&end_server);
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tokio::spawn (async move {
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end_server.run ().await?;
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Ok::<_, anyhow::Error> (())
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})
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};
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if let Some (mut shutdown_rx) = shutdown_rx {
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while ! *shutdown_rx.borrow () {
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shutdown_rx.changed ().await?;
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}
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end_server.shut_down ()?;
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}
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run_task.await??;
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trace! ("P4 end server shut down gracefully.");
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Ok (())
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}
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/// A filled-out config for constructing an end server
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#[derive (Clone)]
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pub struct Config {
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pub debug_echo: bool,
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pub id: String,
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pub relay_addr: SocketAddr,
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pub relay_cert: Vec <u8>,
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}
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impl Opt {
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/// Converts self into a Config that the server can use.
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/// Performs I/O to load the relay cert from disk or from HTTP.
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/// Fails if arguments can't be parsed or if I/O fails.
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pub async fn into_config (self) -> anyhow::Result <Config> {
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let id = self.server_id.clone ().unwrap_or_else (|| "bogus_server".to_string ());
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let relay_addr: SocketAddr = self.relay_addr.clone ().unwrap_or_else (|| String::from ("127.0.0.1:30380")).parse ()?;
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// Do I/O after all parsing is done.
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// We don't want to waste a network request only to come back and error
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// out on like "127.oooo.1" not parsing into a relay address.
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let relay_cert: Vec <u8> = match self.cert_url.as_ref () {
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Some (url) => reqwest::get (url).await?.bytes ().await?.into_iter ().collect (),
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None => tokio::fs::read ("ptth_quic_output/quic_server.crt").await?,
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};
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Ok (Config {
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debug_echo: self.debug_echo,
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id,
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relay_addr,
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relay_cert,
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})
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}
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}
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pub struct P4EndServer {
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endpoint: quinn::Endpoint,
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conf: Arc <Config>,
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shutdown_tx: watch::Sender <bool>,
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shutdown_rx: watch::Receiver <bool>,
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}
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impl P4EndServer {
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pub fn connect (conf: Config) -> anyhow::Result <Self> {
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trace! ("P4 end server making its QUIC endpoint");
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let endpoint = make_client_endpoint ("0.0.0.0:0".parse ()?, &[&conf.relay_cert])?;
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let (shutdown_tx, shutdown_rx) = watch::channel (false);
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Ok (P4EndServer {
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conf: Arc::new (conf),
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endpoint,
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shutdown_tx,
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shutdown_rx,
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})
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}
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pub fn config (&self) -> &Config {
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&*self.conf
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}
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pub async fn run (&self) -> anyhow::Result <()> {
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trace! ("P4 end server connecting to P3 relay server");
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let quinn::NewConnection {
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mut bi_streams,
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..
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} = protocol::p4_connect_to_p3 (
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&self.endpoint,
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&self.conf.relay_addr,
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&self.conf.id
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).await?;
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debug! ("Connected to relay server");
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trace! ("Accepting bi streams from P3");
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let mut shutdown_rx = self.shutdown_rx.clone ();
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loop {
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tokio::select! {
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_ = shutdown_rx.changed () => {
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if *shutdown_rx.borrow () {
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trace! ("P4 incoming bi streams task caught graceful shutdown");
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break;
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}
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}
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stream_opt = bi_streams.next () => {
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let (relay_send, relay_recv) = stream_opt.ok_or_else (|| anyhow::anyhow! ("P4 ran out of incoming streams. Maybe P3 shut down or disconnected?"))??;
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tokio::spawn (handle_bi_stream (Arc::clone (&self.conf), relay_send, relay_recv));
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}
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};
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}
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Ok (())
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}
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pub fn shut_down (&self) -> anyhow::Result <()> {
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trace! ("P4 end server shutting down...");
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Ok (self.shutdown_tx.send (true)?)
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}
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pub fn shutting_down (&self) -> bool {
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*self.shutdown_rx.borrow ()
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}
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}
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async fn handle_bi_stream (
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conf: Arc <Config>,
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relay_send: quinn::SendStream,
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mut relay_recv: quinn::RecvStream,
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) -> anyhow::Result <()>
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{
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match protocol::p4_accept_p3_stream (&mut relay_recv).await? {
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protocol::P3ToP4Stream::NewPtthConnection {
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client_id,
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..
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} => handle_new_ptth_connection (conf, relay_send, relay_recv, client_id).await?,
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}
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Ok (())
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}
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async fn handle_new_ptth_connection (
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conf: Arc <Config>,
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mut relay_send: quinn::SendStream,
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mut relay_recv: quinn::RecvStream,
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_client_id: String,
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) -> anyhow::Result <()>
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{
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// TODO: Check authorization for P2 --> P4
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protocol::p4_authorize_p2_connection (&mut relay_send).await?;
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let p4_to_p5_req = protocol::p4_expect_p5_request (&mut relay_recv).await?;
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// TODO: Check authorization for P1 --> P5
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protocol::p4_authorize_p1_connection (&mut relay_send).await?;
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debug! ("Started PTTH connection");
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if conf.debug_echo {
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relay_send.write (b"Connected to P4=P5 debug echo server\n").await?;
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debug! ("Relaying bytes using internal debug echo server (P4=P5)");
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tokio::io::copy (&mut relay_recv, &mut relay_send).await?;
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}
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else {
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let stream = TcpStream::connect (("127.0.0.1", p4_to_p5_req.port)).await?;
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let (local_recv, local_send) = stream.into_split ();
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trace! ("Relaying bytes...");
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let ptth_conn = crate::connection::NewConnection {
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local_send,
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local_recv,
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relay_send,
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relay_recv,
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}.build ();
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ptth_conn.wait_for_close ().await?;
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}
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Ok (())
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}
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