Source Code for Module dpkt.arp

 1  # $Id: arp.py 290 2006-01-22 02:43:28Z dugsong $ 
 2   
 3  """Address Resolution Protocol.""" 
 4   
 5  import dpkt 
 6   
 7  # Hardware address format 
 8  ARP_HRD_ETH     = 0x0001        # ethernet hardware 
 9  ARP_HRD_IEEE802 = 0x0006        # IEEE 802 hardware 
10   
11  # Protocol address format 
12  ARP_PRO_IP      = 0x0800        # IP protocol 
13   
14  # ARP operation 
15  ARP_OP_REQUEST          = 1     # request to resolve ha given pa 
16  ARP_OP_REPLY            = 2     # response giving hardware address 
17  ARP_OP_REVREQUEST       = 3     # request to resolve pa given ha 
18  ARP_OP_REVREPLY         = 4     # response giving protocol address 
19   
20 -class ARP(dpkt.Packet): 
21      __hdr__ = ( 
22          ('hrd', 'H', ARP_HRD_ETH), 
23          ('pro', 'H', ARP_PRO_IP), 
24          ('hln', 'B', 6),        # hardware address length 
25          ('pln', 'B', 4),        # protocol address length 
26          ('op', 'H', ARP_OP_REQUEST), 
27          ('sha', '6s', ''), 
28          ('spa', '4s', ''), 
29          ('tha', '6s', ''), 
30          ('tpa', '4s', '') 
31          ) 
32