split network.rs to tcp.rs and udp.rs (#4)

3 files changed, 313 insertions, 0 deletions

diff --git a/mumd/src/network/mod.rs b/mumd/src/network/mod.rs
new file mode 100644
index 0000000..f7a6a76
--- /dev/null
+++ b/mumd/src/network/mod.rs
@@ -0,0 +1,2 @@
+pub mod tcp;
+pub mod udp;
diff --git a/mumd/src/network/tcp.rs b/mumd/src/network/tcp.rs
new file mode 100644
index 0000000..dde98aa
--- /dev/null
+++ b/mumd/src/network/tcp.rs
@@ -0,0 +1,180 @@
+use crate::audio::Audio;
+use crate::state::Server;
+use log::*;
+
+use futures::channel::oneshot;
+use futures::{join, SinkExt, StreamExt};
+use futures_util::stream::{SplitSink, SplitStream};
+use mumble_protocol::control::{msgs, ClientControlCodec, ControlCodec, ControlPacket};
+use mumble_protocol::crypt::ClientCryptState;
+use mumble_protocol::{Clientbound, Serverbound};
+use std::convert::{Into, TryInto};
+use std::net::{SocketAddr};
+use std::sync::{Arc, Mutex};
+use tokio::net::TcpStream;
+use tokio::time::{self, Duration};
+use tokio_tls::{TlsConnector, TlsStream};
+use tokio_util::codec::{Decoder, Framed};
+
+type TcpSender = SplitSink<
+    Framed<TlsStream<TcpStream>, ControlCodec<Serverbound, Clientbound>>,
+    ControlPacket<Serverbound>,
+>;
+type TcpReceiver =
+    SplitStream<Framed<TlsStream<TcpStream>, ControlCodec<Serverbound, Clientbound>>>;
+
+pub async fn handle(
+    server: Arc<Mutex<Server>>,
+    server_addr: SocketAddr,
+    server_host: String,
+    username: String,
+    accept_invalid_cert: bool,
+    crypt_state_sender: oneshot::Sender<ClientCryptState>,
+    audio: Arc<Mutex<Audio>>,
+) {
+    let (sink, stream) = connect(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;
+
+    info!("Logging in...");
+
+    join!(
+        send_pings(Arc::clone(&sink), 10),
+        listen(server, sink, stream, crypt_state_sender, audio),
+    );
+}
+
+async fn connect(
+    server_addr: SocketAddr,
+    server_host: String,
+    accept_invalid_cert: bool,
+) -> (TcpSender, TcpReceiver) {
+    let stream = TcpStream::connect(&server_addr)
+        .await
+        .expect("failed to connect to server:");
+    debug!("TCP connected");
+
+    let mut builder = native_tls::TlsConnector::builder();
+    builder.danger_accept_invalid_certs(accept_invalid_cert);
+    let connector: TlsConnector = builder
+        .build()
+        .expect("failed to create TLS connector")
+        .into();
+    let tls_stream = connector
+        .connect(&server_host, stream)
+        .await
+        .expect("failed to connect TLS: {}");
+    debug!("TLS connected");
+
+    // Wrap the TLS stream with Mumble's client-side control-channel codec
+    ClientControlCodec::new().framed(tls_stream).split()
+}
+
+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 send_pings(sink: Arc<Mutex<TcpSender>>, delay_seconds: u64) {
+    let mut interval = time::interval(Duration::from_secs(delay_seconds));
+    loop {
+        interval.tick().await;
+        trace!("Sending ping");
+        let msg = msgs::Ping::new();
+        sink.lock().unwrap().send(msg.into()).await.unwrap();
+    }
+}
+
+async fn listen(
+    server: Arc<Mutex<Server>>,
+    sink: Arc<Mutex<TcpSender>>,
+    mut stream: TcpReceiver,
+    crypt_state_sender: oneshot::Sender<ClientCryptState>,
+    audio: Arc<Mutex<Audio>>,
+) {
+    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) => {
+                info!(
+                    "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) => {
+                debug!("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(msg) => {
+                info!("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!"),
+                    );
+                }
+                let mut server = server.lock().unwrap();
+                server.parse_server_sync(msg);
+                match &server.welcome_text {
+                    Some(s) => info!("Welcome: {}", s),
+                    None => info!("No welcome received"),
+                }
+                for (_, channel) in server.channels() {
+                    info!("Found channel {}", channel.name());
+                }
+                sink.lock().unwrap().send(msgs::UserList::new().into()).await.unwrap();
+            }
+            ControlPacket::Reject(msg) => {
+                warn!("Login rejected: {:?}", msg);
+            }
+            ControlPacket::UserState(msg) => {
+                audio.lock().unwrap().add_client(msg.get_session());
+                let mut server = server.lock().unwrap();
+                let session = msg.get_session();
+                server.parse_user_state(msg);
+                let user = server.users().get(&session).unwrap();
+                info!("User {} connected to {}",
+                         user.name(),
+                         user.channel());
+            }
+            ControlPacket::UserRemove(msg) => {
+                info!("User {} left", msg.get_session());
+                audio.lock().unwrap().remove_client(msg.get_session());
+            }
+            ControlPacket::ChannelState(msg) => {
+                debug!("Channel state received");
+                server.lock().unwrap().parse_channel_state(msg);
+            }
+            ControlPacket::ChannelRemove(msg) => {
+                server.lock().unwrap().parse_channel_remove(msg);
+            }
+            _ => {}
+        }
+    }
+}
diff --git a/mumd/src/network/udp.rs b/mumd/src/network/udp.rs
new file mode 100644
index 0000000..39f16b6
--- /dev/null
+++ b/mumd/src/network/udp.rs
@@ -0,0 +1,131 @@
+use crate::audio::Audio;
+use log::*;
+
+use bytes::Bytes;
+use futures::channel::oneshot;
+use futures::{join, SinkExt, StreamExt};
+use futures_util::stream::{SplitSink, SplitStream};
+use mumble_protocol::crypt::ClientCryptState;
+use mumble_protocol::voice::{VoicePacket, VoicePacketPayload};
+use mumble_protocol::Serverbound;
+use std::net::{Ipv6Addr, SocketAddr};
+use std::sync::{Arc, Mutex};
+use tokio::net::UdpSocket;
+use tokio_util::udp::UdpFramed;
+
+type UdpSender = SplitSink<UdpFramed<ClientCryptState>, (VoicePacket<Serverbound>, SocketAddr)>;
+type UdpReceiver = SplitStream<UdpFramed<ClientCryptState>>;
+
+pub async fn connect(
+    crypt_state: oneshot::Receiver<ClientCryptState>,
+) -> (UdpSender, UdpReceiver) {
+    // Bind UDP socket
+    let udp_socket = UdpSocket::bind((Ipv6Addr::from(0u128), 0u16))
+        .await
+        .expect("Failed to bind UDP socket");
+
+    // Wait for initial CryptState
+    let crypt_state = match crypt_state.await {
+        Ok(crypt_state) => crypt_state,
+        // disconnected before we received the CryptSetup packet, oh well
+        Err(_) => panic!("disconnect before crypt packet received"), //TODO exit gracefully
+    };
+    debug!("UDP connected");
+
+    // Wrap the raw UDP packets in Mumble's crypto and voice codec (CryptState does both)
+    UdpFramed::new(udp_socket, crypt_state).split()
+}
+
+async fn listen(
+    _sink: Arc<Mutex<UdpSender>>,
+    mut source: UdpReceiver,
+    audio: Arc<Mutex<Audio>>,
+) {
+    while let Some(packet) = source.next().await {
+        let (packet, _src_addr) = match packet {
+            Ok(packet) => packet,
+            Err(err) => {
+                warn!("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 {
+                session_id,
+                // seq_num,
+                payload,
+                // position_info,
+                ..
+            } => {
+                audio.lock().unwrap().decode_packet(session_id, payload);
+            }
+        }
+    }
+}
+
+async fn send_ping(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();
+}
+
+async fn send_voice(
+    sink: Arc<Mutex<UdpSender>>,
+    server_addr: SocketAddr,
+    audio: Arc<Mutex<Audio>>,
+) {
+    let mut receiver = audio.lock().unwrap().take_receiver().unwrap();
+
+    let mut count = 0;
+    while let Some(payload) = receiver.recv().await {
+        let reply = VoicePacket::Audio {
+            _dst: std::marker::PhantomData,
+            target: 0,      // normal speech
+            session_id: (), // unused for server-bound packets
+            seq_num: count,
+            payload,
+            position_info: None,
+        };
+        count += 1;
+        sink.lock()
+            .unwrap()
+            .send((reply, server_addr))
+            .await
+            .unwrap();
+    }
+}
+
+pub async fn handle(
+    server_addr: SocketAddr,
+    crypt_state: oneshot::Receiver<ClientCryptState>,
+    audio: Arc<Mutex<Audio>>,
+) {
+    let (mut sink, source) = connect(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(&mut sink, server_addr).await;
+
+    let sink = Arc::new(Mutex::new(sink));
+    join!(
+        listen(Arc::clone(&sink), source, Arc::clone(&audio)),
+        send_voice(sink, server_addr, audio)
+    );
+}