1 // Copyright 2016 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.
13 ifname string // name of interface being used
14 nodeID [6]byte // hardware for version 1 UUIDs
15 zeroID [6]byte // nodeID with only 0's
18 // NodeInterface returns the name of the interface from which the NodeID was
19 // derived. The interface "user" is returned if the NodeID was set by
21 func NodeInterface() string {
27 // SetNodeInterface selects the hardware address to be used for Version 1 UUIDs.
28 // If name is "" then the first usable interface found will be used or a random
29 // Node ID will be generated. If a named interface cannot be found then false
32 // SetNodeInterface never fails when name is "".
33 func SetNodeInterface(name string) bool {
36 return setNodeInterface(name)
39 func setNodeInterface(name string) bool {
40 iname, addr := getHardwareInterface(name) // null implementation for js
41 if iname != "" && addr != nil {
47 // We found no interfaces with a valid hardware address. If name
48 // does not specify a specific interface generate a random Node ID
58 // NodeID returns a slice of a copy of the current Node ID, setting the Node ID
59 // if not already set.
60 func NodeID() []byte {
70 // SetNodeID sets the Node ID to be used for Version 1 UUIDs. The first 6 bytes
71 // of id are used. If id is less than 6 bytes then false is returned and the
72 // Node ID is not set.
73 func SetNodeID(id []byte) bool {
84 // NodeID returns the 6 byte node id encoded in uuid. It returns nil if uuid is
85 // not valid. The NodeID is only well defined for version 1 and 2 UUIDs.
86 func (uuid UUID) NodeID() []byte {
88 copy(node[:], uuid[10:])