Synnefo

# Copyright 2012 GRNET S.A. All rights reserved.

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import re

_VALID_MAC_RE = re.compile("^([0-9a-f]{2}:){5}[0-9a-f]{2}$", re.I)

def validate_mac(mac):

    """Validate a MAC address and return normalized form."""

    if not _VALID_MAC_RE.match(mac):

        raise InvalidMacAddress("Invalid MAC address '%s'" % mac)

    return mac.lower()

class InvalidMacAddress(Exception):

    pass