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# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# Copyright 2011 Justin Santa Barbara
# All Rights Reserved.
#
# 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.
"""IPv6 address generation with account identifier embedded."""
import hashlib
import netaddr
def to_global(prefix, mac, project_id):
project_hash = netaddr.IPAddress(
int(hashlib.sha1(project_id).hexdigest()[:8], 16) << 32)
static_num = netaddr.IPAddress(0xff << 24)
try:
mac_suffix = netaddr.EUI(mac).words[3:]
int_addr = int(''.join(['%02x' % i for i in mac_suffix]), 16)
mac_addr = netaddr.IPAddress(int_addr)
maskIP = netaddr.IPNetwork(prefix).ip
return (project_hash ^ static_num ^ mac_addr | maskIP).format()
except netaddr.AddrFormatError:
raise TypeError(_('Bad mac for to_global_ipv6: %s') % mac)
except TypeError:
raise TypeError(_('Bad prefix for to_global_ipv6: %s') % prefix)
except NameError:
raise TypeError(_('Bad project_id for to_global_ipv6: %s') %
project_id)
def to_mac(ipv6_address):
address = netaddr.IPAddress(ipv6_address)
mask1 = netaddr.IPAddress('::ff:ffff')
mac = netaddr.EUI(int(address & mask1)).words
return ':'.join(['02', '16', '3e'] + ['%02x' % i for i in mac[3:6]])
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