88 lines
2.8 KiB
Python
88 lines
2.8 KiB
Python
# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import random
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import socket
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from neutron_lib import constants
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def get_hostname():
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"""Get the hostname of the system.
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:returns: The hostname of the system.
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"""
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return socket.gethostname()
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def get_random_mac(base_mac):
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"""Get a random MAC address string of the specified base format.
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The first 3 octets will remain unchanged. If the 4th octet is not
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00, it will also be used. The others will be randomly generated.
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:param base_mac: Base MAC address represented by an array of 6 strings/int
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:returns: The MAC address string.
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"""
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mac = [int(base_mac[0], 16), int(base_mac[1], 16),
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int(base_mac[2], 16), random.getrandbits(8),
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random.getrandbits(8), random.getrandbits(8)]
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if base_mac[3] != '00':
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mac[3] = int(base_mac[3], 16)
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return ':'.join(["%02x" % x for x in mac])
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def random_mac_generator(base_mac):
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"""Generates random mac addresses from a specified base format.
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The first 3 octets of each MAC address will remain unchanged. If the 4th
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octet is not 00, it will also be used. The others will be randomly
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generated.
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:param base_mac: Base mac address represented by an array of 6 strings.
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:returns: A mac address string generator.
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"""
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fixed = list(base_mac[0:3])
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to_generate = 3
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if base_mac[3] != '00':
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fixed = list(base_mac[0:4])
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to_generate = 2
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beginning = ':'.join(fixed) + ':'
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form = '{}' + ':'.join('{:02x}' for _ in range(to_generate))
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max_macs = 2 ** (to_generate * 8)
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seen = set()
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while len(seen) < max_macs:
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numbers = [random.getrandbits(8) for _ in range(to_generate)]
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mac = form.format(beginning, *numbers)
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if mac in seen:
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continue
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else:
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seen.add(mac)
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yield mac
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def is_port_trusted(port):
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"""Used to determine if port can be trusted not to attack network.
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Trust is currently based on the device_owner field starting with 'network:'
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since we restrict who can use that in the default policy.json file.
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:param port: The port dict to inspect the 'device_owner' for.
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:returns: True if the port dict's 'device_owner' value starts with the
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networking prefix. False otherwise.
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"""
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return port['device_owner'].startswith(
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constants.DEVICE_OWNER_NETWORK_PREFIX)
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