big ol refactor

Co-authored-by: Eskil Queseth <eskilq@kth.se>

1 files changed, 228 insertions, 13 deletions

diff --git a/mumd/src/network.rs b/mumd/src/network.rs
index 34b5d01..82b45da 100644
--- a/mumd/src/network.rs
+++ b/mumd/src/network.rs
@@ -1,32 +1,53 @@
+use crate::audio::Audio;
+
+use bytes::Bytes;
+use mumble_protocol::voice::VoicePacketPayload;
+use opus::Channels;
+
 use futures::channel::oneshot;
+use futures::join;
+use futures::SinkExt;
 use futures::StreamExt;
 use futures_util::stream::{SplitSink, SplitStream};
-use mumble_protocol::{Serverbound, Clientbound};
+use mumble_protocol::control::msgs;
 use mumble_protocol::control::ClientControlCodec;
 use mumble_protocol::control::ControlCodec;
 use mumble_protocol::control::ControlPacket;
 use mumble_protocol::crypt::ClientCryptState;
 use mumble_protocol::voice::VoicePacket;
+use mumble_protocol::{Clientbound, Serverbound};
+use std::convert::Into;
+use std::convert::TryInto;
 use std::net::Ipv6Addr;
 use std::net::SocketAddr;
+use std::sync::Arc;
+use std::sync::Mutex;
 use tokio::net::TcpStream;
 use tokio::net::UdpSocket;
+use tokio::time::{self, Duration};
 use tokio_tls::TlsConnector;
 use tokio_tls::TlsStream;
 use tokio_util::codec::Decoder;
 use tokio_util::codec::Framed;
 use tokio_util::udp::UdpFramed;
 
-pub async fn connect_tcp(
+type TcpSender = SplitSink<
+    Framed<TlsStream<TcpStream>, ControlCodec<Serverbound, Clientbound>>,
+    ControlPacket<Serverbound>,
+>;
+type TcpReceiver =
+    SplitStream<Framed<TlsStream<TcpStream>, ControlCodec<Serverbound, Clientbound>>>;
+type UdpSender = SplitSink<UdpFramed<ClientCryptState>, (VoicePacket<Serverbound>, SocketAddr)>;
+type UdpReceiver = SplitStream<UdpFramed<ClientCryptState>>;
+
+async fn connect_tcp(
     server_addr: SocketAddr,
     server_host: String,
     accept_invalid_cert: bool,
-) -> (
-    SplitSink<Framed<TlsStream<TcpStream>, ControlCodec<Serverbound, Clientbound>>, ControlPacket<Serverbound>>,
-    SplitStream<Framed<TlsStream<TcpStream>, ControlCodec<Serverbound, Clientbound>>>
-) {
-
-    let stream = TcpStream::connect(&server_addr).await.expect("failed to connect to server:");
+) -> (TcpSender, TcpReceiver) {
+    let stream = TcpStream::connect(&server_addr)
+        .await
+        .expect("failed to connect to server:");
     println!("TCP connected");
 
     let mut builder = native_tls::TlsConnector::builder();
@@ -46,12 +67,8 @@ pub async fn connect_tcp(
 }
 
 pub async fn connect_udp(
-    server_addr: SocketAddr,
     crypt_state: oneshot::Receiver<ClientCryptState>,
-) -> (
-    SplitSink<UdpFramed<ClientCryptState>, (VoicePacket<Serverbound>, SocketAddr)>,
-    SplitStream<UdpFramed<ClientCryptState>>
-) {
+) -> (UdpSender, UdpReceiver) {
     // Bind UDP socket
     let udp_socket = UdpSocket::bind((Ipv6Addr::from(0u128), 0u16))
         .await
@@ -68,3 +85,201 @@ pub async fn connect_udp(
     // Wrap the raw UDP packets in Mumble's crypto and voice codec (CryptState does both)
     UdpFramed::new(udp_socket, crypt_state).split()
 }
+
+async fn send_pings(sink: Arc<Mutex<TcpSender>>, delay_seconds: u64) {
+    let mut interval = time::interval(Duration::from_secs(delay_seconds));
+    loop {
+        interval.tick().await;
+        println!("Sending ping");
+        let msg = msgs::Ping::new();
+        sink.lock().unwrap().send(msg.into()).await.unwrap();
+    }
+}
+
+async fn authenticate(sink: Arc<Mutex<TcpSender>>, username: String) {
+    let mut msg = msgs::Authenticate::new();
+    msg.set_username(username);
+    msg.set_opus(true);
+    sink.lock().unwrap().send(msg.into()).await.unwrap();
+}
+
+async fn listen_tcp(
+    sink: Arc<Mutex<TcpSender>>,
+    mut stream: TcpReceiver,
+    crypt_state_sender: oneshot::Sender<ClientCryptState>,
+) {
+    let mut crypt_state = None;
+    let mut crypt_state_sender = Some(crypt_state_sender);
+
+    while let Some(packet) = stream.next().await {
+        //TODO handle types separately
+        match packet.unwrap() {
+            ControlPacket::TextMessage(mut msg) => {
+                println!(
+                    "Got message from user with session ID {}: {}",
+                    msg.get_actor(),
+                    msg.get_message()
+                );
+                // Send reply back to server
+                let mut response = msgs::TextMessage::new();
+                response.mut_session().push(msg.get_actor());
+                response.set_message(msg.take_message());
+                let mut lock = sink.lock().unwrap();
+                lock.send(response.into()).await.unwrap();
+            }
+            ControlPacket::CryptSetup(msg) => {
+                println!("crypt setup");
+                // Wait until we're fully connected before initiating UDP voice
+                crypt_state = Some(ClientCryptState::new_from(
+                    msg.get_key()
+                        .try_into()
+                        .expect("Server sent private key with incorrect size"),
+                    msg.get_client_nonce()
+                        .try_into()
+                        .expect("Server sent client_nonce with incorrect size"),
+                    msg.get_server_nonce()
+                        .try_into()
+                        .expect("Server sent server_nonce with incorrect size"),
+                ));
+            }
+            ControlPacket::ServerSync(_) => {
+                println!("Logged in!");
+                if let Some(sender) = crypt_state_sender.take() {
+                    let _ = sender.send(
+                        crypt_state
+                            .take()
+                            .expect("Server didn't send us any CryptSetup packet!"),
+                    );
+                }
+            }
+            ControlPacket::Reject(msg) => {
+                println!("Login rejected: {:?}", msg);
+            }
+            _ => {}
+        }
+    }
+}
+
+pub async fn handle_tcp(
+    server_addr: SocketAddr,
+    server_host: String,
+    username: String,
+    accept_invalid_cert: bool,
+    crypt_state_sender: oneshot::Sender<ClientCryptState>,
+) {
+    let (sink, stream) = connect_tcp(server_addr, server_host, accept_invalid_cert).await;
+    let sink = Arc::new(Mutex::new(sink));
+
+    // Handshake (omitting `Version` message for brevity)
+    authenticate(Arc::clone(&sink), username).await;
+
+    println!("Logging in..");
+
+    join!(
+        send_pings(Arc::clone(&sink), 10),
+        listen_tcp(sink, stream, crypt_state_sender),
+    );
+}
+
+async fn listen_udp(
+    _sink: Arc<Mutex<UdpSender>>,
+    mut source: UdpReceiver,
+    mut opus_decoder: opus::Decoder,
+    audio: Audio,
+) {
+    while let Some(packet) = source.next().await {
+        let (packet, _src_addr) = match packet {
+            Ok(packet) => packet,
+            Err(err) => {
+                eprintln!("Got an invalid UDP packet: {}", err);
+                // To be expected, considering this is the internet, just ignore it
+                continue;
+            }
+        };
+        match packet {
+            VoicePacket::Ping { .. } => {
+                // Note: A normal application would handle these and only use UDP for voice
+                //       once it has received one.
+                continue;
+            }
+            VoicePacket::Audio {
+                // seq_num,
+                payload,
+                // position_info,
+                ..
+            } => {
+                match payload {
+                    VoicePacketPayload::Opus(bytes, _eot) => {
+                        let mut out: Vec<f32> =
+                            vec![0.0; bytes.len() * audio.output_config.channels as usize * 4];
+                        opus_decoder
+                            .decode_float(&bytes[..], &mut out, false)
+                            .expect("error decoding");
+                        let mut lock = audio.output_buffer.lock().unwrap();
+                        lock.extend(out);
+                    }
+                    _ => {
+                        unimplemented!("något fint");
+                    }
+                }
+
+                // decode paylout and put it in buffer
+
+                // Got audio, naively echo it back
+                //let reply = VoicePacket::Audio {
+                //    _dst: std::marker::PhantomData,
+                //    target: 0,      // normal speech
+                //    session_id: (), // unused for server-bound packets
+                //    seq_num,
+                //    payload,
+                //    position_info,
+                //};
+                //sink.send((reply, src_addr)).await.unwrap();
+            }
+        }
+    }
+}
+
+async fn send_ping_udp(sink: &mut UdpSender, server_addr: SocketAddr) {
+    sink.send((
+        VoicePacket::Audio {
+            _dst: std::marker::PhantomData,
+            target: 0,
+            session_id: (),
+            seq_num: 0,
+            payload: VoicePacketPayload::Opus(Bytes::from([0u8; 128].as_ref()), true),
+            position_info: None,
+        },
+        server_addr,
+    ))
+    .await
+    .unwrap();
+}
+
+pub async fn handle_udp(
+    server_addr: SocketAddr,
+    crypt_state: oneshot::Receiver<ClientCryptState>,
+    audio: Audio,
+) {
+    let opus_decoder = opus::Decoder::new(
+        audio.output_config.sample_rate.0 as u32,
+        match audio.output_config.channels {
+            1 => Channels::Mono,
+            2 => Channels::Stereo,
+            _ => unimplemented!(
+                "ljudnörd (got {} channels, need 1 or 2)",
+                audio.output_config.channels
+            ),
+        },
+    )
+    .unwrap();
+
+    let (mut sink, source) = connect_udp(crypt_state).await;
+
+    // Note: A normal application would also send periodic Ping packets, and its own audio
+    //       via UDP. We instead trick the server into accepting us by sending it one
+    //       dummy voice packet.
+    send_ping_udp(&mut sink, server_addr).await;
+
+    listen_udp(Arc::new(Mutex::new(sink)), source, opus_decoder, audio).await;
+}