Matteo Scandolo | 3896c47 | 2017-08-01 13:31:42 -0700 | [diff] [blame] | 1 | |
| 2 | # Copyright 2017-present Open Networking Foundation |
| 3 | # |
| 4 | # Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | # you may not use this file except in compliance with the License. |
| 6 | # You may obtain a copy of the License at |
| 7 | # |
| 8 | # http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | # |
| 10 | # Unless required by applicable law or agreed to in writing, software |
| 11 | # distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | # See the License for the specific language governing permissions and |
| 14 | # limitations under the License. |
| 15 | |
| 16 | |
Zack Williams | 3dfe6af | 2016-04-30 11:37:09 -0700 | [diff] [blame] | 17 | import hashlib |
| 18 | import netaddr |
| 19 | |
| 20 | def genmac(value, prefix='', length=12): |
| 21 | ''' |
| 22 | deterministically generates a "random" MAC with a configurable prefix |
| 23 | ''' |
| 24 | |
| 25 | # from: http://serverfault.com/questions/40712/what-range-of-mac-addresses-can-i-safely-use-for-my-virtual-machines |
Zack Williams | 05c2172 | 2016-04-30 11:42:58 -0700 | [diff] [blame] | 26 | if prefix == '' : |
Zack Williams | 3dfe6af | 2016-04-30 11:37:09 -0700 | [diff] [blame] | 27 | mac_prefix = "0ac04d" # random "cord"-esque |
| 28 | |
| 29 | # deterministically generate a value |
| 30 | h = hashlib.new('sha1') |
| 31 | h.update(value) |
| 32 | |
| 33 | # build/trim MAC |
| 34 | mac_string = (mac_prefix + h.hexdigest())[0:length] |
| 35 | |
| 36 | return netaddr.EUI(mac_string) |
| 37 | |
| 38 | class FilterModule(object): |
| 39 | ''' MAC generation filter ''' |
| 40 | filter_map = { |
| 41 | 'genmac': genmac, |
| 42 | } |
| 43 | |
| 44 | def filters(self): |
| 45 | return self.filter_map |