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- """Address Resolution Protocol."""
- from pypacker import pypacker
- # 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(pypacker.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", b"\x00" * 6), # sender mac
- ("spa", "4s", b"\x00" * 6), # sender ip
- ("tha", "6s", b"\x00" * 6), # target mac
- ("tpa", "4s", b"\x00" * 6) # target ip
- )
- # convenient access
- sha_s = pypacker.get_property_mac("sha")
- spa_s = pypacker.get_property_ip4("spa")
- tha_s = pypacker.get_property_mac("tha")
- tpa_s = pypacker.get_property_ip4("tpa")
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