From 303beff5dd1aa42f9be45313a4381aa1ce45fb7b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=A3=8E=E6=89=87=E6=BB=91=E7=BF=94=E7=BF=BC?=
 <Fangliding.fshxy@outlook.com>
Date: Tue, 6 Feb 2024 18:56:55 +0800
Subject: [PATCH] Fix SockOpt does not work in UDP

---
 transport/internet/system_dialer.go | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/transport/internet/system_dialer.go b/transport/internet/system_dialer.go
index cdb6cb9c..2c2fdf85 100644
--- a/transport/internet/system_dialer.go
+++ b/transport/internet/system_dialer.go
@@ -66,6 +66,18 @@ func (d *DefaultSystemDialer) Dial(ctx context.Context, src net.Address, dest ne
 		if err != nil {
 			return nil, err
 		}
+		if sockopt != nil || len(d.controllers) > 0 {
+			file, err := packetConn.(*net.UDPConn).File()
+			if err != nil {
+				return nil, err
+			}
+			fd := file.Fd()
+			if sockopt != nil {
+				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,
 			Dest: destAddr,