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# $Id: arp.py 23 2006-11-08 15:45:33Z dugsong $
"""Address Resolution Protocol."""
import dpkt
# Hardware address format
ARP_HRD_ETH = 0x0001 # ethernet hardware
ARP_HRD_IEEE802 = 0x0006 # IEEE 802 hardware
# Protocol address format
ARP_PRO_IP = 0x0800 # IP protocol
# ARP operation
ARP_OP_REQUEST = 1 # request to resolve ha given pa
ARP_OP_REPLY = 2 # response giving hardware address
ARP_OP_REVREQUEST = 3 # request to resolve pa given ha
ARP_OP_REVREPLY = 4 # response giving protocol address
class ARP(dpkt.Packet):
__hdr__ = (
('hrd', 'H', ARP_HRD_ETH),
('pro', 'H', ARP_PRO_IP),
('hln', 'B', 6), # hardware address length
('pln', 'B', 4), # protocol address length
('op', 'H', ARP_OP_REQUEST),
('sha', '6s', ''),
('spa', '4s', ''),
('tha', '6s', ''),
('tpa', '4s', '')
)
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