From fc63ec9388ddd881735c6fd48733f46c659d0ab0 Mon Sep 17 00:00:00 2001
From: wwqgtxx <wwqgtxx@gmail.com>
Date: Fri, 5 Apr 2024 10:15:56 +0800
Subject: [PATCH] avoid netlink dos networkUpdateMonitor

---
 monitor_linux.go | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/monitor_linux.go b/monitor_linux.go
index 89c8a58..e92f469 100644
--- a/monitor_linux.go
+++ b/monitor_linux.go
@@ -4,6 +4,7 @@ import (
 	"os"
 	"runtime"
 	"sync"
+	"time"
 
 	"github.com/sagernet/netlink"
 	E "github.com/sagernet/sing/common/exceptions"
@@ -67,6 +68,9 @@ func (m *networkUpdateMonitor) Start() error {
 }
 
 func (m *networkUpdateMonitor) loopUpdate() {
+	const minDuration = time.Second
+	timer := time.NewTimer(minDuration)
+	defer timer.Stop()
 	for {
 		select {
 		case <-m.close:
@@ -75,6 +79,12 @@ func (m *networkUpdateMonitor) loopUpdate() {
 		case <-m.linkUpdate:
 		}
 		m.emit()
+		select {
+		case <-m.close:
+			return
+		case <-timer.C:
+			timer.Reset(minDuration)
+		}
 	}
 }