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Dockerfile

 FROM rust:alpine as builder
+RUN apk add --no-cache musl-dev
 WORKDIR /usr/src/app
+
+COPY Cargo.* .
+RUN mkdir src && \
+    echo 'fn main() {}' > src/main.rs && \
+    cargo build && \
+    cargo clean --package $(awk '/name/ {gsub(/"/,""); print $3}' Cargo.toml | sed ':a;N;$!ba;s/\n//g' | tr -d '\r') && \
+    rm -rf src
+
 COPY . .
 RUN cargo install --path .
 

src/main.rs

@@ -7,7 +7,6 @@ use std::error::Error;
 use std::intrinsics::transmute;
 use std::io::{Read, Write};
 use std::mem::MaybeUninit;
-use std::net::ToSocketAddrs;
 use std::sync::Arc;
 
 #[repr(C)]
@@ -51,7 +50,7 @@ lazy_static! {
 
 fn main() -> Result<(), Box<dyn Error>> {
     let mut sockets: HashMap<u16, Arc<Socket>> = HashMap::new();
-    let mut routers: HashMap<u8, Router> = config
+    let routers: HashMap<u8, Router> = config
         .routers
         .iter()
         .map(|c| Router::new(c, &mut sockets).map(|router| (c.remote_id, router)))
@@ -69,7 +68,7 @@ fn main() -> Result<(), Box<dyn Error>> {
 
     let router_writers3: Vec<(Arc<Socket>, HashMap<u8, RouterWriter>)> = router_writers
         .into_iter()
-        .grouping_by(|(k, v)| v.key())
+        .grouping_by(|(_, v)| v.key())
         .into_iter()
         .map(|(k, v)| {
             (
@@ -102,7 +101,7 @@ fn main() -> Result<(), Box<dyn Error>> {
                     if let Some(ref addr) = *router.endpoint.read().unwrap() {
                         router.encrypt(&mut buffer[meta_size..meta_size + n]);
                         #[cfg(target_os = "linux")]
-                        router.socket.set_mark(router.config.mark)?;
+                        router.socket.set_mark(router.config.mark);
                         let _ = router.socket.send_to(&buffer[..meta_size + n], addr);
                     }
                 }