| |
| # Copyright 2017-present Open Networking Foundation |
| # |
| # Licensed under the Apache License, Version 2.0 (the "License"); |
| # you may not use this file except in compliance with the License. |
| # You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| |
| |
| import hashlib |
| import netaddr |
| |
| def genmac(value, prefix='', length=12): |
| ''' |
| deterministically generates a "random" MAC with a configurable prefix |
| ''' |
| |
| # from: http://serverfault.com/questions/40712/what-range-of-mac-addresses-can-i-safely-use-for-my-virtual-machines |
| if prefix == '' : |
| mac_prefix = "0ac04d" # random "cord"-esque |
| |
| # deterministically generate a value |
| h = hashlib.new('sha1') |
| h.update(value) |
| |
| # build/trim MAC |
| mac_string = (mac_prefix + h.hexdigest())[0:length] |
| |
| return netaddr.EUI(mac_string) |
| |
| class FilterModule(object): |
| ''' MAC generation filter ''' |
| filter_map = { |
| 'genmac': genmac, |
| } |
| |
| def filters(self): |
| return self.filter_map |