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node_net.go (949B)

      1 // Copyright 2017 Google Inc.  All rights reserved.
      2 // Use of this source code is governed by a BSD-style
      3 // license that can be found in the LICENSE file.
      4 
      5 // +build !js
      6 
      7 package uuid
      8 
      9 import "net"
     10 
     11 var interfaces []net.Interface // cached list of interfaces
     12 
     13 // getHardwareInterface returns the name and hardware address of interface name.
     14 // If name is "" then the name and hardware address of one of the system's
     15 // interfaces is returned.  If no interfaces are found (name does not exist or
     16 // there are no interfaces) then "", nil is returned.
     17 //
     18 // Only addresses of at least 6 bytes are returned.
     19 func getHardwareInterface(name string) (string, []byte) {
     20 	if interfaces == nil {
     21 		var err error
     22 		interfaces, err = net.Interfaces()
     23 		if err != nil {
     24 			return "", nil
     25 		}
     26 	}
     27 	for _, ifs := range interfaces {
     28 		if len(ifs.HardwareAddr) >= 6 && (name == "" || name == ifs.Name) {
     29 			return ifs.Name, ifs.HardwareAddr
     30 		}
     31 	}
     32 	return "", nil
     33 }