34 lines
949 B
Go
Vendored
34 lines
949 B
Go
Vendored
// Copyright 2017 Google Inc. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
// +build !js
|
|
|
|
package uuid
|
|
|
|
import "net"
|
|
|
|
var interfaces []net.Interface // 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 returned.
|
|
//
|
|
// 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
|
|
}
|