34 lines
1012 B
Python
34 lines
1012 B
Python
import struct
|
|
import ipaddress
|
|
|
|
|
|
class IP_struct:
|
|
def __init__(self, buff=None):
|
|
header = struct.unpack('<BBHHHBBH4s4s', buff)
|
|
self.ver = header[0] >> 4
|
|
self.ihl = header[0] & 0x0F
|
|
self.tos = header[1]
|
|
self.len = header[2]
|
|
self.id = header[3]
|
|
self.offset = header[4]
|
|
self.ttl = header[5]
|
|
self.protocol_num = header[6]
|
|
self.sum = header[7]
|
|
self.src = header[8]
|
|
self.dst = header[9]
|
|
self.src_address = ipaddress.ip_address(self.src)
|
|
self.dst_address = ipaddress.ip_address(self.dst)
|
|
|
|
# map protocol constants to their names
|
|
self.protocol_map = {1:"ICMP", 6:"TCP", 17: "UDP"}
|
|
|
|
|
|
# ICMP response packet
|
|
class ICMP_struct:
|
|
def __init__(self, buff):
|
|
header = struct.unpack('<BBHHH', buff)
|
|
self.type = header[0]
|
|
self.code = header[1]
|
|
self.sum = header[2]
|
|
self.identifier = header[3]
|
|
self.seq = header[4] |