def macaddr_from_ipv4(ipv4):
"""
Given @ipv4, returns the @macaddr or None if unknown / lookup failed, etc.
"""
if not is_ipv4_address_valid(ipv4):
return None
ipv4 = normalize_ipv4_address(ipv4)
by_ipv4 = load(DHCPD_LEASES_FILENAME)[0]
if ipv4 not in by_ipv4:
return None
else:
return by_ipv4[ipv4].macaddr
def __init__(self, ipv4):
self.ipv4 = normalize_ipv4_address(ipv4)