package route import ( "net" "github.com/sagernet/sing/common/control" ) var _ control.InterfaceFinder = (*myInterfaceFinder)(nil) type myInterfaceFinder struct { ifs []net.Interface } func (f *myInterfaceFinder) update() error { ifs, err := net.Interfaces() if err != nil { return err } f.ifs = ifs return nil } func (f *myInterfaceFinder) InterfaceIndexByName(name string) (interfaceIndex int, err error) { for _, netInterface := range f.ifs { if netInterface.Name == name { return netInterface.Index, nil } } netInterface, err := net.InterfaceByName(name) if err != nil { return } f.update() return netInterface.Index, nil } func (f *myInterfaceFinder) InterfaceNameByIndex(index int) (interfaceName string, err error) { for _, netInterface := range f.ifs { if netInterface.Index == index { return netInterface.Name, nil } } netInterface, err := net.InterfaceByIndex(index) if err != nil { return } f.update() return netInterface.Name, nil }