Fix lint errors

experimental/cachefile/cache.go

@@ -112,7 +112,7 @@ func (c *CacheFile) Start(stage adapter.StartStage) error {
 		db  *bbolt.DB
 		err error
 	)
-	for i := 0; i < 10; i++ {
+	for range 10 {
 		db, err = bbolt.Open(c.path, fileMode, &options)
 		if err == nil {
 			break

experimental/clashapi/server.go

@@ -164,7 +164,7 @@ func (s *Server) Start(stage adapter.StartStage) error {
 				listener net.Listener
 				err      error
 			)
-			for i := 0; i < 3; i++ {
+			for range 3 {
 				listener, err = net.Listen("tcp", s.httpServer.Addr)
 				if runtime.GOOS == "android" && errors.Is(err, syscall.EADDRINUSE) {
 					time.Sleep(100 * time.Millisecond)

experimental/libbox/command_client.go

@@ -147,7 +147,7 @@ func (c *CommandClient) dialWithRetry(target string, contextDialer func(context.
 	var client daemon.StartedServiceClient
 	var lastError error
 
-	for attempt := 0; attempt < commandClientDialAttempts; attempt++ {
+	for attempt := range commandClientDialAttempts {
 		if connection == nil {
 			options := []grpc.DialOption{
 				grpc.WithTransportCredentials(insecure.NewCredentials()),

experimental/libbox/command_server.go

@@ -114,7 +114,7 @@ func (s *CommandServer) Start() error {
 	if sCommandServerListenPort == 0 {
 		sockPath := filepath.Join(sBasePath, "command.sock")
 		os.Remove(sockPath)
-		for i := 0; i < 30; i++ {
+		for range 30 {
 			listener, err = net.ListenUnix("unix", &net.UnixAddr{
 				Name: sockPath,
 				Net:  "unix",

experimental/libbox/command_types.go

@@ -418,13 +418,3 @@ func systemProxyStatusFromGRPC(status *daemon.SystemProxyStatus) *SystemProxySta
 		Enabled:   status.Enabled,
 	}
 }
-
-func systemProxyStatusToGRPC(status *SystemProxyStatus) *daemon.SystemProxyStatus {
-	if status == nil {
-		return nil
-	}
-	return &daemon.SystemProxyStatus{
-		Available: status.Available,
-		Enabled:   status.Enabled,
-	}
-}

experimental/libbox/log.go

@@ -8,8 +8,6 @@ import (
 	"runtime/debug"
 )
 
-var crashOutputFile *os.File
-
 func RedirectStderr(path string) error {
 	if stats, err := os.Stat(path); err == nil && stats.Size() > 0 {
 		_ = os.Rename(path, path+".old")
@@ -32,6 +30,5 @@ func RedirectStderr(path string) error {
 		os.Remove(outputFile.Name())
 		return err
 	}
-	crashOutputFile = outputFile
-	return nil
+	return outputFile.Close()
 }

experimental/libbox/monitor.go

@@ -16,7 +16,6 @@ var (
 type platformDefaultInterfaceMonitor struct {
 	*platformInterfaceWrapper
 	logger      logger.Logger
-	element     *list.Element[tun.NetworkUpdateCallback]
 	callbacks   list.List[tun.DefaultInterfaceUpdateCallback]
 	myInterface string
 }

experimental/libbox/platform.go

@@ -1,9 +1,6 @@
 package libbox
 
-import (
-	C "github.com/sagernet/sing-box/constant"
-	"github.com/sagernet/sing-box/option"
-)
+import C "github.com/sagernet/sing-box/constant"
 
 type PlatformInterface interface {
 	LocalDNSTransport() LocalDNSTransport
@@ -98,37 +95,3 @@ type OnDemandRuleIterator interface {
 	Next() OnDemandRule
 	HasNext() bool
 }
-
-type onDemandRule struct {
-	option.OnDemandRule
-}
-
-func (r *onDemandRule) Target() int32 {
-	if r.OnDemandRule.Action == nil {
-		return -1
-	}
-	return int32(*r.OnDemandRule.Action)
-}
-
-func (r *onDemandRule) DNSSearchDomainMatch() StringIterator {
-	return newIterator(r.OnDemandRule.DNSSearchDomainMatch)
-}
-
-func (r *onDemandRule) DNSServerAddressMatch() StringIterator {
-	return newIterator(r.OnDemandRule.DNSServerAddressMatch)
-}
-
-func (r *onDemandRule) InterfaceTypeMatch() int32 {
-	if r.OnDemandRule.InterfaceTypeMatch == nil {
-		return -1
-	}
-	return int32(*r.OnDemandRule.InterfaceTypeMatch)
-}
-
-func (r *onDemandRule) SSIDMatch() StringIterator {
-	return newIterator(r.OnDemandRule.SSIDMatch)
-}
-
-func (r *onDemandRule) ProbeURL() string {
-	return r.OnDemandRule.ProbeURL
-}

experimental/libbox/tun_darwin.go

@@ -11,7 +11,7 @@ const utunControlName = "com.apple.net.utun_control"
 func GetTunnelFileDescriptor() int32 {
 	ctlInfo := &unix.CtlInfo{}
 	copy(ctlInfo.Name[:], utunControlName)
-	for fd := 0; fd < 1024; fd++ {
+	for fd := range 1024 {
 		addr, err := unix.Getpeername(fd)
 		if err != nil {
 			continue