From 3778a367c8aa5c07162b4003c672945a6296c169 Mon Sep 17 00:00:00 2001
From: yuhan6665 <1588741+yuhan6665@users.noreply.github.com>
Date: Wed, 21 Feb 2024 13:58:50 -0500
Subject: [PATCH] Fix and simplify SockOpt in UDP

https://github.com/golang/go/issues/29277
---
 transport/internet/system_dialer.go | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/transport/internet/system_dialer.go b/transport/internet/system_dialer.go
index 924f364c..3c9239e8 100644
--- a/transport/internet/system_dialer.go
+++ b/transport/internet/system_dialer.go
@@ -2,7 +2,6 @@ package internet
 
 import (
 	"context"
-	"runtime"
 	"syscall"
 	"time"
 
@@ -67,17 +66,16 @@ func (d *DefaultSystemDialer) Dial(ctx context.Context, src net.Address, dest ne
 		if err != nil {
 			return nil, err
 		}
-		if runtime.GOOS != "windows" && (sockopt != nil || len(d.controllers) > 0) {
-			file, err := packetConn.(*net.UDPConn).File()
+		if sockopt != nil {
+			sys, err := packetConn.(*net.UDPConn).SyscallConn()
 			if err != nil {
 				return nil, err
 			}
-			fd := file.Fd()
-			if sockopt != nil {
+			sys.Control(func(fd uintptr) {
 				if err := applyOutboundSocketOptions("udp", dest.NetAddr(), fd, sockopt); err != nil {
 					newError("failed to apply socket options").Base(err).WriteToLog(session.ExportIDToError(ctx))
 				}
-			}
+			})
 		}
 		return &PacketConnWrapper{
 			Conn: packetConn,