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|
#![feature(never_type)]
pub mod config;
use anyhow::bail;
use azalea_protocol::{
packets::{
handshaking::{client_intention_packet::ClientIntentionPacket, ServerboundHandshakePacket},
login::ServerboundLoginPacket,
ConnectionProtocol,
},
read::read_packet,
write::write_packet,
};
// use azalea_protocol::{
// packets::{
// handshake::{client_intention_packet::ClientIntentionPacket, ServerboundHandshakePacket},
// login::ServerboundLoginPacket,
// ConnectionProtocol,
// },
// read::read_packet,
// write::write_packet,
// };
use bytes::BytesMut;
use config::Config;
use log::{error, info, warn};
use std::{
fs::read_to_string,
sync::{Arc, RwLock},
};
use tokio::{
io::{AsyncReadExt, AsyncWriteExt},
net::{
tcp::{OwnedReadHalf, OwnedWriteHalf},
TcpListener, TcpStream,
},
};
fn main() {
env_logger::builder()
.filter_level(log::LevelFilter::Info)
.parse_env("LOG")
.init();
tokio::runtime::Builder::new_multi_thread()
.enable_all()
.build()
.unwrap()
.block_on(async move {
match run().await {
Ok(_) => {}
Err(err) => error!("fatal error: {err}"),
}
});
}
async fn run() -> anyhow::Result<!> {
let config = Arc::new(RwLock::new(Arc::new(serde_yaml::from_str::<Config>(
&read_to_string("proxy.yaml")?,
)?)));
config::watch(config.clone());
let listener = TcpListener::bind(config.read().unwrap().bind).await?;
info!("listening");
loop {
match listener.accept().await {
Ok((sock, addr)) => {
info!("connected: {addr}");
let config = config.read().unwrap().clone();
tokio::spawn(async move {
match handle_client(config, sock).await {
Ok(()) => info!("disconnected: {addr}"),
Err(err) => warn!("error: ({addr}) {err}"),
}
});
}
Err(e) => error!("{}", e),
}
}
}
async fn handle_client(config: Arc<Config>, sock: TcpStream) -> Result<(), anyhow::Error> {
let mut buf = BytesMut::new();
sock.set_nodelay(true)?;
let (mut downstream_reader, downstream_writer) = sock.into_split();
let handshake = read_packet::<ServerboundHandshakePacket, _>(
&mut downstream_reader,
&mut buf,
None,
&mut None,
)
.await?;
let upstream_handshake = match handshake {
ServerboundHandshakePacket::ClientIntention(p) => {
info!(
"new client (version={}, intent={:?})",
p.protocol_version, p.intention
);
if p.protocol_version != config.protocol {
bail!("protocol version unsupported")
}
match p.intention {
ConnectionProtocol::Status => {
handle_status_intent(config, downstream_writer, downstream_reader).await?;
return Ok(());
}
ConnectionProtocol::Login => {}
_ => bail!("unsupported intent"),
}
p
}
};
let login =
read_packet::<ServerboundLoginPacket, _>(&mut downstream_reader, &mut buf, None, &mut None)
.await?;
let upstream_login = match login {
ServerboundLoginPacket::Hello(mut p) => {
info!("client hello (username={:?})", p.name);
let profile = config
.whitelist
.iter()
.find(|e| e.token.as_ref().map_or(false, |e| e == &p.name));
match profile {
Some(profile) => {
info!("login as {:?}", profile.username);
p.name = profile.username.clone();
}
None => bail!("no profile found, disconnecting client"),
}
p
}
ServerboundLoginPacket::LoginAcknowledged(_) => bail!("wtf?"),
ServerboundLoginPacket::Key(_) => bail!("key not supported"),
ServerboundLoginPacket::CustomQueryAnswer(_) => bail!("custom query not supported"),
};
let upstream = TcpStream::connect(config.backend).await?;
let (upstream_reader, mut upstream_writer) = upstream.into_split();
write_packet(
&ServerboundHandshakePacket::ClientIntention(upstream_handshake),
&mut upstream_writer,
None,
&mut None,
)
.await?;
write_packet::<ServerboundLoginPacket, _>(
&ServerboundLoginPacket::Hello(upstream_login),
&mut upstream_writer,
None,
&mut None,
)
.await?;
let task_res = tokio::spawn(async move { connect(downstream_writer, upstream_reader).await });
let res = connect(upstream_writer, downstream_reader).await;
task_res.abort();
res?;
if let Ok(r) = task_res.await {
r?;
}
Ok(())
}
async fn connect(mut writer: OwnedWriteHalf, mut reader: OwnedReadHalf) -> anyhow::Result<()> {
let mut buf = [0; 1024];
loop {
let size = reader.read(&mut buf).await?;
if size == 0 {
break Ok(());
}
writer.write_all(&buf[..size]).await?;
}
}
async fn handle_status_intent(
config: Arc<Config>,
writer: OwnedWriteHalf,
reader: OwnedReadHalf,
) -> anyhow::Result<()> {
// let mut buf = BytesMut::new();
let upstream = TcpStream::connect(config.backend).await?;
upstream.set_nodelay(true)?;
let (upstream_reader, mut upstream_writer) = upstream.into_split();
write_packet(
&ServerboundHandshakePacket::ClientIntention(ClientIntentionPacket {
protocol_version: config.protocol,
hostname: config.backend.ip().to_string(),
port: config.backend.port(),
intention: ConnectionProtocol::Status,
}),
&mut upstream_writer,
None,
&mut None,
)
.await?;
let task_res = tokio::spawn(async move { connect(writer, upstream_reader).await });
let res = connect(upstream_writer, reader).await;
task_res.abort();
res?;
if let Ok(r) = task_res.await {
r?;
}
return Ok(());
}
// loop {
// let req = read_packet::<ServerboundStatusPacket, _>(&mut reader, &mut buf, None, &mut None)
// .await?;
// info!("{req:?}");
// match req {
// ServerboundStatusPacket::StatusRequest(..) => {
// write_packet(
// &ClientboundStatusPacket::StatusResponse(ClientboundStatusResponsePacket {
// description: azalea_chat::component::Component::Text(
// legacy_color_code_to_text_component("blub"),
// ),
// favicon: None,
// players: Players {
// max: 10,
// online: 0,
// sample: vec![],
// },
// version: Version {
// name: azalea_chat::component::Component::Text(
// legacy_color_code_to_text_component("blub"),
// ),
// protocol: 760,
// },
// }),
// &mut writer,
// None,
// &mut None,
// )
// .await?;
// }
// ServerboundStatusPacket::PingRequest(p) => {
// write_packet(
// &ClientboundStatusPacket::PongResponse(ClientboundPongResponsePacket {
// time: p.time,
// }),
// &mut writer,
// None,
// &mut None,
// )
// .await?;
// }
// }
// }
// Ok(())
// for _ in 0..3 {
// let a = read_packet::<ClientboundLoginPacket, _>(
// &mut upstream_reader,
// &mut buf,
// None,
// &mut None,
// )
// .await?;
// debug!("login {a:?}");
// write_packet(&a, &mut downstream_writer, None, &mut None).await?;
// }
// tokio::spawn(async move {
// let mut buf = BytesMut::new();
// loop {
// let a = read_packet::<ClientboundGamePacket, _>(
// &mut upstream_reader,
// &mut buf,
// None,
// &mut None,
// )
// .await
// .unwrap();
// debug!("downstream {a:?}");
// write_packet(&a, &mut downstream_writer, None, &mut None)
// .await
// .unwrap();
// }
// });
// loop {
// let a = read_packet::<ClientboundGamePacket, _>(
// &mut downstream_reader,
// &mut buf,
// None,
// &mut None,
// )
// .await?;
// debug!("upstream {a:?}");
// write_packet(&a, &mut upstream_writer, None, &mut None).await?;
// }
|
