chore: better apply tcp keepalive to listeners

adapter/inbound/listen.go

@@ -3,6 +3,9 @@ package inbound
 import (
 	"context"
 	"net"
+	"sync"
+
+	"github.com/metacubex/mihomo/component/keepalive"
 
 	"github.com/metacubex/tfo-go"
 )
@@ -11,28 +14,47 @@ var (
 	lc = tfo.ListenConfig{
 		DisableTFO: true,
 	}
+	mutex sync.RWMutex
 )
 
 func SetTfo(open bool) {
+	mutex.Lock()
+	defer mutex.Unlock()
 	lc.DisableTFO = !open
 }
 
 func Tfo() bool {
+	mutex.RLock()
+	defer mutex.RUnlock()
 	return !lc.DisableTFO
 }
 
 func SetMPTCP(open bool) {
+	mutex.Lock()
+	defer mutex.Unlock()
 	setMultiPathTCP(&lc.ListenConfig, open)
 }
 
 func MPTCP() bool {
+	mutex.RLock()
+	defer mutex.RUnlock()
 	return getMultiPathTCP(&lc.ListenConfig)
 }
 
 func ListenContext(ctx context.Context, network, address string) (net.Listener, error) {
+	mutex.RLock()
+	defer mutex.RUnlock()
 	return lc.Listen(ctx, network, address)
 }
 
 func Listen(network, address string) (net.Listener, error) {
 	return ListenContext(context.Background(), network, address)
 }
+
+func init() {
+	keepalive.SetDisableKeepAliveCallback.Register(func(b bool) {
+		mutex.Lock()
+		defer mutex.Unlock()
+		keepalive.SetNetListenConfig(&lc.ListenConfig)
+	})
+}