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feat(socks): enforce semaphore to limit connection count #171

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feat(socks): enforce semaphore to limit connection count #171

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f243f56
fix: Limit concurrent connections to prevent file descriptor exhaustion
google-labs-jules[bot] Sep 23, 2025
a5bfbca
Merge branch '0x676e67:master' into fix/too-many-open-files
Abidbdwork Sep 23, 2025
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11 changes: 10 additions & 1 deletion src/socks/server/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,7 @@ use connection::{
bind::{self, Bind},
connect::{self, Connect},
};
use tokio::net::TcpListener;
use tokio::{net::TcpListener, sync::Semaphore};

pub mod auth;
pub mod connection;
Expand All @@ -31,6 +31,7 @@ pub struct Socks5Server {
listener: TcpListener,
auth: Arc<AuthAdaptor>,
connector: Connector,
sem: Arc<Semaphore>,
}

impl Socks5Server {
Expand All @@ -54,6 +55,7 @@ impl Socks5Server {
listener: socket.listen(ctx.concurrent as _)?,
auth: Arc::new(auth),
connector: ctx.connector,
sem: Arc::new(Semaphore::new(ctx.concurrent)),
})
}
}
Expand All @@ -65,7 +67,14 @@ impl Serve for Socks5Server {
while let Ok((stream, socket_addr)) = self.listener.accept().await {
let connector = self.connector.clone();
let auth = self.auth.clone();
let sem = self.sem.clone();
tokio::spawn(async move {
let _permit = match sem.acquire().await {
Ok(permit) => permit,
Err(_) => {
return;
}
};
if let Err(err) = handle(
IncomingConnection::new(stream, auth),
socket_addr,
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