#
# Copyright (c) 2022 Pim van Pelt
#
# 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 logging
import netaddr

def is_valid(mac):
    """ Return True if the string given in `mac` is a valid (6-byte) MAC address,
        as defined by netaddr.EUI """
    try:
        addr = netaddr.EUI(mac)
    except:
        return False
    return True

def is_local(mac):
    """ Return True if a MAC address is a valid locally administered one. """
    try:
        addr = netaddr.EUI(mac)
    except:
        return False
    return bool(addr.words[0] & 0b10)

def is_multicast(mac):
    """ Return True if a MAC address is a valid multicast one. """
    try:
        addr = netaddr.EUI(mac)
    except:
        return False
    return bool(addr.words[0] & 0b01)

def is_unicast(mac):
    """ Return True if a MAC address is a valid unicast one. """
    try:
        addr = netaddr.EUI(mac)
    except:
        return False
    return not bool(addr.words[0] & 0b01)