Cargo.toml

@@ -7,22 +7,23 @@ license = "MIT OR Apache-2.0"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-anyhow = { version = "1.0.71", features = ["backtrace"] }
-async-trait = "0.1.68"
-axum = "0.6.18"
-env_logger = "0.10.0"
-idna = "0.4.0"
-log = "0.4.19"
-parking_lot = "0.12.1"
-quinn = "0.10.1"
+axum = "0.7.5"
+eyre = "0.6.12"
+idna = "1.0.0"
+parking_lot = "0.12.3"
+quinn = "0.11.2"
 rand = "0.8.5"
-rustls = "0.21.9"
-rustls-pemfile = "1.0.2"
+rustls = "0.23.10"
+rustls-pemfile = "2.1.2"
+sentry = { version = "0.34.0", default-features = false, features = ["backtrace", "contexts", "panic", "debug-images", "reqwest", "rustls"] }
+sentry-tracing = "0.34.0"
 serde = { version = "1.0.164", features = ["derive"] }
 serde_json = "1.0.97"
 thiserror = "1.0.40"
 tokio = { version = "1.28.2", features = ["rt-multi-thread", "fs", "macros", "io-util", "net"] }
+tracing = "0.1.40"
+tracing-subscriber = { version = "0.3.18", features = ["env-filter"] }
 
 [profile.release]
 lto = "fat"
-debug = "full"
+debug = "full"

flake.lock

@@ -3,8 +3,8 @@
     "nixpkgs": {
       "locked": {
         "lastModified": 0,
-        "narHash": "sha256-doPgfj+7FFe9rfzWo1siAV2mVCasW+Bh8I1cToAXEE4=",
-        "path": "/nix/store/asymc3nsl739p1wwr0w6xbjnqs3qb94p-source",
+        "narHash": "sha256-1+ua0ggXlYYPLTmMl3YeYYsBXDSCqT+Gw3u6l4gvMhA=",
+        "path": "/nix/store/x887lkxvgnrrcfgrzz351qhfvvrkm80x-source",
         "type": "path"
       },
       "original": {

flake.nix

@@ -115,6 +115,12 @@
               example = "/path/to/key.pem";
               description = lib.mdDoc "Path to TLS key to use for quiclime connections.";
             };
+
+            sentryDsn = mkOption {
+              type = types.str;
+              example = "https://key@sentry.io/42";
+              description = lib.mdDoc "Sentry DSN to use for error reports.";
+            };
           };
         };
 
@@ -141,6 +147,7 @@
               QUICLIME_BIND_ADDR_WEB = cfg.controlAddr;
               QUICLIME_CERT_PATH = cfg.cert;
               QUICLIME_KEY_PATH = cfg.key;
+              SENTRY_DSN = cfg.sentryDsn;
             };
           };
 

src/main.rs

@@ -2,22 +2,30 @@
 #![allow(clippy::cast_possible_truncation)]
 #![allow(clippy::cast_possible_wrap)]
 
-use std::{convert::Infallible, net::SocketAddr, sync::Arc, time::Duration};
+use std::{
+    convert::Infallible,
+    net::SocketAddr,
+    sync::{atomic::AtomicUsize, Arc},
+    time::Duration,
+};
 
-use anyhow::{anyhow, Context};
 use axum::{
     http::StatusCode,
     routing::{get, post},
 };
-use log::{error, info};
+use eyre::{eyre, OptionExt, WrapErr};
 use netty::{Handshake, ReadError};
-use quinn::{Connecting, ConnectionError, Endpoint, ServerConfig, TransportConfig};
+use quinn::{
+    crypto::rustls::QuicServerConfig, ConnectionError, Endpoint, Incoming, ServerConfig,
+    TransportConfig,
+};
 use routing::RoutingTable;
-use rustls::{Certificate, PrivateKey};
 use tokio::{
     io::{AsyncReadExt, AsyncWriteExt},
-    net::TcpStream,
+    net::{TcpListener, TcpStream},
 };
+use tracing::{error, info};
+use tracing_subscriber::{prelude::*, EnvFilter};
 
 use crate::{
     netty::{ReadExt, WriteExt},
@@ -30,50 +38,24 @@ mod routing;
 mod unicode_madness;
 mod wordlist;
 
-fn any_private_keys(rd: &mut dyn std::io::BufRead) -> Result<Vec<Vec<u8>>, std::io::Error> {
-    let mut keys = Vec::<Vec<u8>>::new();
-
-    loop {
-        match rustls_pemfile::read_one(rd)? {
-            None => return Ok(keys),
-            Some(
-                rustls_pemfile::Item::RSAKey(key)
-                | rustls_pemfile::Item::PKCS8Key(key)
-                | rustls_pemfile::Item::ECKey(key),
-            ) => keys.push(key),
-            _ => {}
-        };
-    }
-}
-
-fn get_certs() -> anyhow::Result<(Vec<Certificate>, PrivateKey)> {
-    let mut cert_file = std::io::BufReader::new(std::fs::File::open(
-        std::env::var("QUICLIME_CERT_PATH").context("Reading QUICLIME_CERT_PATH")?,
-    )?);
-    let certs = rustls_pemfile::certs(&mut cert_file)?
-        .into_iter()
-        .map(Certificate)
+async fn create_server_config() -> eyre::Result<ServerConfig> {
+    let cert_file =
+        tokio::fs::read(std::env::var("QUICLIME_CERT_PATH").context("Reading QUICLIME_CERT_PATH")?)
+            .await?;
+    let cert_chain = rustls_pemfile::certs(&mut cert_file.as_slice())
+        .filter_map(Result::ok)
         .collect();
-    let mut key_file = std::io::BufReader::new(std::fs::File::open(
-        std::env::var("QUICLIME_KEY_PATH").context("Reading QUICLIME_KEY_PATH")?,
-    )?);
-    let key = PrivateKey(
-        any_private_keys(&mut key_file)?
-            .into_iter()
-            .next()
-            .ok_or(anyhow::anyhow!("No private key?"))?,
-    );
-    Ok((certs, key))
-}
-
-async fn create_server_config() -> anyhow::Result<ServerConfig> {
-    let (cert_chain, key_der) = tokio::task::spawn_blocking(get_certs).await??;
+    let key_file =
+        tokio::fs::read(std::env::var("QUICLIME_KEY_PATH").context("Reading QUICLIME_KEY_PATH")?)
+            .await?;
+    let key_der = rustls_pemfile::private_key(&mut key_file.as_slice())?
+        .ok_or_eyre("No private key in QUICLIME_KEY_PATH!")?;
     let mut rustls_config = rustls::ServerConfig::builder()
-        .with_safe_defaults()
         .with_no_client_auth()
         .with_single_cert(cert_chain, key_der)?;
     rustls_config.alpn_protocols = vec![b"quiclime".to_vec()];
-    let mut config = ServerConfig::with_crypto(Arc::new(rustls_config));
+    let config: QuicServerConfig = rustls_config.try_into()?;
+    let mut config = ServerConfig::with_crypto(Arc::new(config));
     let mut transport = TransportConfig::default();
     transport
         .max_concurrent_bidi_streams(1u32.into())
@@ -83,9 +65,32 @@ async fn create_server_config() -> anyhow::Result<ServerConfig> {
     Ok(config)
 }
 
+static CLIENT_COUNT: AtomicUsize = AtomicUsize::new(0);
+
+struct ClientCounterGuard;
+
+impl ClientCounterGuard {
+    fn new() -> Self {
+        CLIENT_COUNT.fetch_add(1, std::sync::atomic::Ordering::Relaxed);
+        Self
+    }
+}
+
+impl Drop for ClientCounterGuard {
+    fn drop(&mut self) {
+        CLIENT_COUNT.fetch_sub(1, std::sync::atomic::Ordering::Relaxed);
+    }
+}
+
 #[tokio::main]
-async fn main() -> anyhow::Result<()> {
-    env_logger::init();
+async fn main() -> eyre::Result<()> {
+    let _guard = sentry::init(std::env::var("SENTRY_DSN").ok());
+    tracing_subscriber::registry()
+        .with(EnvFilter::from_default_env())
+        .with(tracing_subscriber::fmt::layer())
+        .with(sentry_tracing::layer())
+        .init();
+    rustls::crypto::aws_lc_rs::default_provider().install_default().unwrap();
     // JUSTIFICATION: this lives until the end of the entire program
     let endpoint = Box::leak(Box::new(Endpoint::server(
         create_server_config().await?,
@@ -106,10 +111,7 @@ async fn main() -> anyhow::Result<()> {
     Ok(())
 }
 
-async fn try_handle_quic(
-    connection: Connecting,
-    routing_table: &RoutingTable,
-) -> anyhow::Result<()> {
+async fn try_handle_quic(connection: Incoming, routing_table: &RoutingTable) -> eyre::Result<()> {
     let connection = connection.await?;
     info!(
         "QUIClime connection established to: {}",
@@ -163,7 +165,7 @@ async fn try_handle_quic(
                         } else if let Err(ConnectionError::ConnectionClosed(_)) = pair {
                             break;
                         }
-                        remote.send(pair?).map_err(|e| anyhow::anyhow!("{:?}", e))?;
+                        remote.send(pair?).map_err(|e| eyre!("{:?}", e))?;
                     }
                     routing::RouterRequest::BroadcastRequest(message) => {
                         let response =
@@ -180,8 +182,10 @@ async fn try_handle_quic(
     }
 }
 
-async fn handle_quic(connection: Connecting, routing_table: &RoutingTable) {
+#[tracing::instrument(skip(routing_table))]
+async fn handle_quic(connection: Incoming, routing_table: &RoutingTable) {
     if let Err(e) = try_handle_quic(connection, routing_table).await {
+        sentry::capture_error::<dyn std::error::Error>(e.as_ref());
         error!("Error handling QUIClime connection: {}", e);
     };
     info!("Finished handling QUIClime connection");
@@ -190,21 +194,27 @@ async fn handle_quic(connection: Connecting, routing_table: &RoutingTable) {
 async fn listen_quic(
     endpoint: &'static Endpoint,
     routing_table: &'static RoutingTable,
-) -> anyhow::Result<Infallible> {
+) -> eyre::Result<Infallible> {
     while let Some(connection) = endpoint.accept().await {
         tokio::spawn(handle_quic(connection, routing_table));
     }
-    Err(anyhow!("quiclime endpoint closed"))
+    Err(eyre!("quiclime endpoint closed"))
 }
 
 async fn listen_control(
     endpoint: &'static Endpoint,
     routing_table: &'static RoutingTable,
-) -> anyhow::Result<Infallible> {
+) -> eyre::Result<Infallible> {
     let app = axum::Router::new()
         .route(
             "/metrics",
-            get(|| async { format!("host_count {}", routing_table.size()) }),
+            get(|| async {
+                format!(
+                    "host_count {}\nguest_count {}\n",
+                    routing_table.size(),
+                    CLIENT_COUNT.load(std::sync::atomic::Ordering::Relaxed)
+                )
+            }),
         )
         .route(
             "/reload-certs",
@@ -225,23 +235,24 @@ async fn listen_control(
         .route(
             "/stop",
             post(|| async {
+                routing_table.broadcast("e4mc relay server stopping!");
+                tokio::time::sleep(Duration::from_secs(1)).await;
                 endpoint.close(0u32.into(), b"e4mc closing");
             }),
         );
-    axum::Server::bind(
-        &std::env::var("QUICLIME_BIND_ADDR_WEB")
-            .context("Reading QUICLIME_BIND_ADDR_WEB")?
-            .parse()?,
+    let listener = TcpListener::bind(
+        std::env::var("QUICLIME_BIND_ADDR_WEB").context("Reading QUICLIME_BIND_ADDR_WEB")?,
     )
-    .serve(app.into_make_service())
     .await?;
-    Err(anyhow!("control endpoint closed"))
+    axum::serve(listener, app).await?;
+    Err(eyre!("control endpoint closed"))
 }
 
 async fn try_handle_minecraft(
     mut connection: TcpStream,
     routing_table: &'static RoutingTable,
-) -> anyhow::Result<()> {
+) -> eyre::Result<()> {
+    let guard = ClientCounterGuard::new();
     let peer = connection.peer_addr()?;
     info!("Minecraft client connected from: {}", peer);
     let handshake = netty::read_packet(&mut connection).await;
@@ -259,29 +270,24 @@ async fn try_handle_minecraft(
         return politely_disconnect(connection, handshake).await;
     };
     handshake.send(&mut send_host).await?;
-    let (mut recv_client, mut send_client) = connection.split();
-    tokio::select! {
-        _ = tokio::io::copy(&mut recv_client, &mut send_host) => (),
-        _ = tokio::io::copy(&mut recv_host, &mut send_client) => ()
-    }
+    let mut conn_host = tokio::io::join(&mut recv_host, &mut send_host);
+    _ = tokio::io::copy_bidirectional(&mut connection, &mut conn_host);
     _ = connection.shutdown().await;
-    _ = send_host.finish().await;
+    _ = send_host.finish();
     _ = recv_host.stop(0u32.into());
     info!("Minecraft client disconnected from: {}", peer);
+    drop(guard);
     Ok(())
 }
 
-async fn politely_disconnect(
-    mut connection: TcpStream,
-    handshake: Handshake,
-) -> anyhow::Result<()> {
+async fn politely_disconnect(mut connection: TcpStream, handshake: Handshake) -> eyre::Result<()> {
     match handshake.next_state {
         netty::HandshakeType::Status => {
             let packet = netty::read_packet(&mut connection).await?;
             let mut packet = packet.as_slice();
             let id = packet.read_varint()?;
             if id != 0 {
-                return Err(anyhow!(
+                return Err(eyre!(
                     "Packet isn't a Status Request(0x00), but {:#04x}",
                     id
                 ));
@@ -296,10 +302,7 @@ async fn politely_disconnect(
             let mut packet = packet.as_slice();
             let id = packet.read_varint()?;
             if id != 1 {
-                return Err(anyhow!(
-                    "Packet isn't a Ping Request(0x01), but {:#04x}",
-                    id
-                ));
+                return Err(eyre!("Packet isn't a Ping Request(0x01), but {:#04x}", id));
             }
             let payload = packet.read_long()?;
             let mut buf = Vec::with_capacity(1 + 8);
@@ -321,13 +324,15 @@ async fn politely_disconnect(
     Ok(())
 }
 
+#[tracing::instrument(skip(routing_table))]
 async fn handle_minecraft(connection: TcpStream, routing_table: &'static RoutingTable) {
     if let Err(e) = try_handle_minecraft(connection, routing_table).await {
-        error!("Error handling Minecraft connection: {}", e.backtrace());
+        sentry::capture_error::<dyn std::error::Error>(e.as_ref());
+        error!("Error handling Minecraft connection: {:#}", e);
     };
 }
 
-async fn listen_minecraft(routing_table: &'static RoutingTable) -> anyhow::Result<Infallible> {
+async fn listen_minecraft(routing_table: &'static RoutingTable) -> eyre::Result<Infallible> {
     let server = tokio::net::TcpListener::bind(
         std::env::var("QUICLIME_BIND_ADDR_MC")
             .context("Reading QUICLIME_BIND_ADDR_MC")?
@@ -340,6 +345,7 @@ async fn listen_minecraft(routing_table: &'static RoutingTable) -> anyhow::Resul
                 tokio::spawn(handle_minecraft(connection, routing_table));
             }
             Err(e) => {
+                sentry::capture_error(&e);
                 error!("Error accepting minecraft connection: {}", e);
             }
         }

src/netty.rs

@@ -4,9 +4,8 @@ use std::io::Read;
 
 use tokio::io::{AsyncReadExt, AsyncWriteExt};
 
-use async_trait::async_trait;
-use log::error;
 use thiserror::Error;
+use tracing::error;
 
 #[derive(Error, Debug)]
 pub enum ReadError {
@@ -119,7 +118,6 @@ async fn read_varint(mut reader: impl AsyncReadExt + Unpin) -> Result<i32, ReadE
 
 impl<T: Read> ReadExt for T {}
 
-#[async_trait]
 pub trait WriteExt: AsyncWriteExt + Unpin {
     async fn write_varint(&mut self, mut val: i32) -> std::io::Result<()> {
         for _ in 0..5 {
@@ -156,10 +154,10 @@ pub enum HandshakeType {
 }
 
 impl Handshake {
-    pub fn new(mut packet: &[u8]) -> anyhow::Result<Self> {
+    pub fn new(mut packet: &[u8]) -> eyre::Result<Self> {
         let packet_type = packet.read_varint()?;
         if packet_type != 0 {
-            Err(anyhow::anyhow!("Not a Handshake packet"))
+            Err(eyre::eyre!("Not a Handshake packet"))
         } else {
             let protocol_version = packet.read_varint()?;
             let server_address = packet.read_string()?;
@@ -167,7 +165,7 @@ impl Handshake {
             let next_state = match packet.read_varint()? {
                 1 => HandshakeType::Status,
                 2 => HandshakeType::Login,
-                _ => return Err(anyhow::anyhow!("Invalid next state")),
+                _ => return Err(eyre::eyre!("Invalid next state")),
             };
             Ok(Self {
                 protocol_version,

src/routing.rs

@@ -1,5 +1,3 @@
-use log::info;
-use log::warn;
 use parking_lot::RwLock;
 use quinn::RecvStream;
 use quinn::SendStream;
@@ -7,6 +5,8 @@ use rand::prelude::*;
 use std::collections::HashMap;
 use tokio::sync::mpsc;
 use tokio::sync::oneshot;
+use tracing::info;
+use tracing::warn;
 
 #[derive(Debug)]
 pub enum RouterRequest {