ducky/devices
2015-11-12
Parent:b6494e1a499e
ducky/devices/vendor/code.google.com/p/go-uuid/uuid/node.go
Move DeviceType to its own file, add helper and constants. Make a device_type.go file, to avoid a mess in the devices.go file. Move the DeviceType definition over to the new file. Also, while we're here, set up a few of the contstants we know we'll need. These are the DeviceTypes we intend to support, such as Android phones, Android tablets, and Chrome extensions. Also, set up a helper method that will determine whether a DeviceType is "valid", i.e. if we have a constant defined for it. DeviceTypes, in general, are mostly intended to be used (at the moment, at least) to customise how we display devices to users. Basically, they allow us to display an at least semi-accurate depiction of the device.
| paddy@0 | 1 // Copyright 2011 Google Inc. All rights reserved. |
| paddy@0 | 2 // Use of this source code is governed by a BSD-style |
| paddy@0 | 3 // license that can be found in the LICENSE file. |
| paddy@0 | 4 |
| paddy@0 | 5 package uuid |
| paddy@0 | 6 |
| paddy@0 | 7 import "net" |
| paddy@0 | 8 |
| paddy@0 | 9 var ( |
| paddy@0 | 10 interfaces []net.Interface // cached list of interfaces |
| paddy@0 | 11 ifname string // name of interface being used |
| paddy@0 | 12 nodeID []byte // hardware for version 1 UUIDs |
| paddy@0 | 13 ) |
| paddy@0 | 14 |
| paddy@0 | 15 // NodeInterface returns the name of the interface from which the NodeID was |
| paddy@0 | 16 // derived. The interface "user" is returned if the NodeID was set by |
| paddy@0 | 17 // SetNodeID. |
| paddy@0 | 18 func NodeInterface() string { |
| paddy@0 | 19 return ifname |
| paddy@0 | 20 } |
| paddy@0 | 21 |
| paddy@0 | 22 // SetNodeInterface selects the hardware address to be used for Version 1 UUIDs. |
| paddy@0 | 23 // If name is "" then the first usable interface found will be used or a random |
| paddy@0 | 24 // Node ID will be generated. If a named interface cannot be found then false |
| paddy@0 | 25 // is returned. |
| paddy@0 | 26 // |
| paddy@0 | 27 // SetNodeInterface never fails when name is "". |
| paddy@0 | 28 func SetNodeInterface(name string) bool { |
| paddy@0 | 29 if interfaces == nil { |
| paddy@0 | 30 var err error |
| paddy@0 | 31 interfaces, err = net.Interfaces() |
| paddy@0 | 32 if err != nil && name != "" { |
| paddy@0 | 33 return false |
| paddy@0 | 34 } |
| paddy@0 | 35 } |
| paddy@0 | 36 |
| paddy@0 | 37 for _, ifs := range interfaces { |
| paddy@0 | 38 if len(ifs.HardwareAddr) >= 6 && (name == "" || name == ifs.Name) { |
| paddy@0 | 39 if setNodeID(ifs.HardwareAddr) { |
| paddy@0 | 40 ifname = ifs.Name |
| paddy@0 | 41 return true |
| paddy@0 | 42 } |
| paddy@0 | 43 } |
| paddy@0 | 44 } |
| paddy@0 | 45 |
| paddy@0 | 46 // We found no interfaces with a valid hardware address. If name |
| paddy@0 | 47 // does not specify a specific interface generate a random Node ID |
| paddy@0 | 48 // (section 4.1.6) |
| paddy@0 | 49 if name == "" { |
| paddy@0 | 50 if nodeID == nil { |
| paddy@0 | 51 nodeID = make([]byte, 6) |
| paddy@0 | 52 } |
| paddy@0 | 53 randomBits(nodeID) |
| paddy@0 | 54 return true |
| paddy@0 | 55 } |
| paddy@0 | 56 return false |
| paddy@0 | 57 } |
| paddy@0 | 58 |
| paddy@0 | 59 // NodeID returns a slice of a copy of the current Node ID, setting the Node ID |
| paddy@0 | 60 // if not already set. |
| paddy@0 | 61 func NodeID() []byte { |
| paddy@0 | 62 if nodeID == nil { |
| paddy@0 | 63 SetNodeInterface("") |
| paddy@0 | 64 } |
| paddy@0 | 65 nid := make([]byte, 6) |
| paddy@0 | 66 copy(nid, nodeID) |
| paddy@0 | 67 return nid |
| paddy@0 | 68 } |
| paddy@0 | 69 |
| paddy@0 | 70 // SetNodeID sets the Node ID to be used for Version 1 UUIDs. The first 6 bytes |
| paddy@0 | 71 // of id are used. If id is less than 6 bytes then false is returned and the |
| paddy@0 | 72 // Node ID is not set. |
| paddy@0 | 73 func SetNodeID(id []byte) bool { |
| paddy@0 | 74 if setNodeID(id) { |
| paddy@0 | 75 ifname = "user" |
| paddy@0 | 76 return true |
| paddy@0 | 77 } |
| paddy@0 | 78 return false |
| paddy@0 | 79 } |
| paddy@0 | 80 |
| paddy@0 | 81 func setNodeID(id []byte) bool { |
| paddy@0 | 82 if len(id) < 6 { |
| paddy@0 | 83 return false |
| paddy@0 | 84 } |
| paddy@0 | 85 if nodeID == nil { |
| paddy@0 | 86 nodeID = make([]byte, 6) |
| paddy@0 | 87 } |
| paddy@0 | 88 copy(nodeID, id) |
| paddy@0 | 89 return true |
| paddy@0 | 90 } |
| paddy@0 | 91 |
| paddy@0 | 92 // NodeID returns the 6 byte node id encoded in uuid. It returns nil if uuid is |
| paddy@0 | 93 // not valid. The NodeID is only well defined for version 1 and 2 UUIDs. |
| paddy@0 | 94 func (uuid UUID) NodeID() []byte { |
| paddy@0 | 95 if len(uuid) != 16 { |
| paddy@0 | 96 return nil |
| paddy@0 | 97 } |
| paddy@0 | 98 node := make([]byte, 6) |
| paddy@0 | 99 copy(node, uuid[10:]) |
| paddy@0 | 100 return node |
| paddy@0 | 101 } |