Function getHardwareInterface

node_net.go:19–33

cached list of interfaces getHardwareInterface returns the name and hardware address of interface name. If name is "" then the name and hardware address of one of the system's interfaces is returned. If no interfaces are found (name does not exist or there are no interfaces) then "", nil is returne

(name string)

//
// Only addresses of at least 6 bytes are returned.
func getHardwareInterface(name string) (string, []byte) {
	if interfaces == nil {
		var err error
		interfaces, err = net.Interfaces()
		if err != nil {
			return "", nil
		}
	}
	for _, ifs := range interfaces {
		if len(ifs.HardwareAddr) >= 6 && (name == "" || name == ifs.Name) {
			return ifs.Name, ifs.HardwareAddr
		}
	}
	return "", nil
}