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header_decoding.py
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header_decoding.py
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import socket
import os
import struct
from ctypes import *
import sys
host = sys.argv[1]
class IP(Structure):
_fields_ = [
("ihl", c_ubyte, 4),
("version", c_ubyte, 4),
("tos", c_ubyte),
("len", c_ushort),
("id", c_ushort),
("offset", c_ushort),
("ttl", c_ubyte),
("protocol_num", c_ubyte),
("sum", c_ushort),
("src", c_uint),
("dst", c_uint)
]
def __new__(cls, socket_buffer=None):
return cls.from_buffer_copy(socket_buffer)
def __init__(self, socket_buffer=None):
self.protocol_map = {1: "ICMP", 6: "TCP", 17: "UDP"}
self.src_address = socket.inet_ntoa(struct.pack("<L", self.src))
self.dst_address = socket.inet_ntoa(struct.pack("<L", self.dst))
try:
self.protocol = self.protocol_map[self.protocol_num]
except:
self.protocol = str(self.protocol_num)
if os.name == "nt":
socket_protocol = socket.IPPROTO_IP
else:
socket_protocol = socket.IPPROTO_ICMP
sniffer = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket_protocol)
sniffer.bind((host, 0))
sniffer.setsockopt(socket.IPPROTO_IP, socket.IP_HDRINCL, 1)
if os.name == "nt":
sniffer.ioctl(socket.SIO_RCVALL, socket.RCVALL_ON)
try:
while True:
raw_buffer = sniffer.recvfrom(65565)[0]
ip_header = IP(raw_buffer[0:20])
print "Protocol: %s %s -> %s" % (ip_header.protocol,
ip_header.src_address,
ip_header.dst_address)
except KeyboardInterrupt:
if os.name == "nt":
sniffer.ioctl(socket.SIO_RCVALL, socket.RCVALL_OFF)