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|
use crate::network::ConnectionInfo;
use crate::state::State;
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::sync::watch;
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()
}
pub async fn handle(
state: Arc<Mutex<State>>,
mut connection_info_receiver: watch::Receiver<Option<ConnectionInfo>>,
crypt_state: oneshot::Receiver<ClientCryptState>,
) {
let connection_info = loop {
match connection_info_receiver.recv().await {
None => { return; }
Some(None) => {}
Some(Some(connection_info)) => { break connection_info; }
}
};
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, connection_info.socket_addr).await;
let sink = Arc::new(Mutex::new(sink));
join!(
listen(Arc::clone(&state), source),
send_voice(state, sink, connection_info.socket_addr),
);
}
async fn listen(
state: Arc<Mutex<State>>,
mut source: UdpReceiver,
) {
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,
..
} => {
state.lock().unwrap().audio().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(
state: Arc<Mutex<State>>,
sink: Arc<Mutex<UdpSender>>,
server_addr: SocketAddr,
) {
let mut receiver = state.lock().unwrap().audio_mut().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();
}
}
|
