2021-07-17 23:58:11 +00:00
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use structopt::StructOpt;
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2021-07-17 03:11:01 +00:00
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use tokio::net::TcpStream;
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2021-07-17 00:58:35 +00:00
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use quic_demo::prelude::*;
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2021-07-18 17:57:54 +00:00
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use protocol::Command;
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2021-07-17 00:58:35 +00:00
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2021-07-17 23:58:11 +00:00
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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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local_tcp_port: Option <u16>,
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#[structopt (long)]
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server_id: Option <u8>,
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}
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2021-07-17 00:58:35 +00:00
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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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2021-07-17 23:58:11 +00:00
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let opt = Opt::from_args ();
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let local_tcp_port = opt.local_tcp_port.unwrap_or (30382);
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2021-07-17 00:58:35 +00:00
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let server_cert = tokio::fs::read ("quic_server.crt").await?;
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2021-07-17 23:58:11 +00:00
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let relay_addr = opt.relay_addr.unwrap_or_else (|| String::from ("127.0.0.1:30380")).parse ()?;
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2021-07-17 00:58:35 +00:00
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let endpoint = make_client_endpoint ("0.0.0.0:0".parse ()?, &[&server_cert])?;
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2021-07-17 21:42:51 +00:00
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trace! ("Connecting to relay server");
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2021-07-17 00:58:35 +00:00
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2021-07-18 18:33:19 +00:00
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let server_id = opt.server_id.unwrap_or (43);
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2021-07-17 00:58:35 +00:00
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let quinn::NewConnection {
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mut bi_streams,
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..
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2021-07-18 18:33:19 +00:00
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} = protocol::p4_connect_to_p3 (&endpoint, &relay_addr, server_id).await?;
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2021-07-17 06:12:16 +00:00
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2021-07-17 21:42:51 +00:00
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trace! ("Accepting bi streams from P3");
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2021-07-17 07:11:34 +00:00
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2021-07-17 20:36:29 +00:00
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loop {
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2021-07-18 18:52:51 +00:00
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let (relay_send, relay_recv) = bi_streams.next ().await.ok_or_else (|| anyhow::anyhow! ("Relay server didn't open a bi stream"))??;
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2021-07-17 03:11:01 +00:00
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2021-07-18 18:52:51 +00:00
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tokio::spawn (handle_p2_connection (relay_send, relay_recv, local_tcp_port));
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2021-07-17 20:36:29 +00:00
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}
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}
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2021-07-18 18:52:51 +00:00
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async fn handle_p2_connection (
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mut relay_send: quinn::SendStream,
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mut relay_recv: quinn::RecvStream,
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local_tcp_port: u16,
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) -> anyhow::Result <()>
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{
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let mut req_buf = [0, 0, 0, 0];
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relay_recv.read_exact (&mut req_buf).await?;
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assert_eq! (req_buf [0], Command::CONNECT_P2_TO_P4_STEP_2.0);
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// TODO: Authorize P2 to connect to us
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let resp_buf = [
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Command::OKAY.0,
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Command::CONNECT_P2_TO_P4_STEP_2.0,
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0,
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0,
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];
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relay_send.write_all (&resp_buf).await?;
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let mut req_buf = [0, 0, 0, 0];
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relay_recv.read_exact (&mut req_buf).await?;
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assert_eq! (req_buf [0], Command::CONNECT_P2_TO_P5.0);
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// TODO: Authorize P2 to connect to P5
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let resp_buf = [
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Command::OKAY.0,
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Command::CONNECT_P2_TO_P5.0,
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0,
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0,
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];
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relay_send.write_all (&resp_buf).await?;
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debug! ("Started PTTH connection");
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let stream = TcpStream::connect (("127.0.0.1", local_tcp_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 = PtthNewConnection {
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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.uplink_task.await??;
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ptth_conn.downlink_task.await??;
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Ok (())
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}
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2021-07-17 20:36:29 +00:00
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struct PtthNewConnection {
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local_send: tokio::net::tcp::OwnedWriteHalf,
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local_recv: tokio::net::tcp::OwnedReadHalf,
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relay_send: quinn::SendStream,
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relay_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 local_send,
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mut local_recv,
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mut relay_send,
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mut relay_recv,
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} = self;
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2021-07-17 03:11:01 +00:00
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2021-07-17 20:36:29 +00:00
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let uplink_task = tokio::spawn (async move {
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// Downlink - Relay server to local client
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let mut buf = vec! [0u8; 65_536];
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while let Some (bytes_read) = relay_recv.read (&mut buf).await? {
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let buf_slice = &buf [0..bytes_read];
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2021-07-17 21:42:51 +00:00
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trace! ("Uplink relaying {} bytes", bytes_read);
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2021-07-17 20:36:29 +00:00
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local_send.write_all (buf_slice).await?;
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2021-07-17 20:02:16 +00:00
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}
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2021-07-17 20:36:29 +00:00
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2021-07-17 23:14:50 +00:00
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trace! ("Downlink closed");
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2021-07-17 20:36:29 +00:00
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Ok::<_, anyhow::Error> (())
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});
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2021-07-17 03:11:01 +00:00
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2021-07-17 20:36:29 +00:00
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let downlink_task = tokio::spawn (async move {
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// Uplink - local client to relay server
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let mut buf = vec! [0u8; 65_536];
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loop {
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let bytes_read = local_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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2021-07-17 21:42:51 +00:00
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trace! ("Downlink relaying {} bytes", bytes_read);
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2021-07-17 20:36:29 +00:00
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relay_send.write_all (buf_slice).await?;
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}
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2021-07-17 23:14:50 +00:00
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trace! ("Uplink closed");
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2021-07-17 20:36:29 +00:00
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Ok::<_, anyhow::Error> (())
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});
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2021-07-17 06:43:14 +00:00
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2021-07-17 20:36:29 +00:00
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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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2021-07-17 00:58:35 +00:00
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}
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