python

import socket
import os
import struct
from ctypes import *
host = "192.168.0.187"
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_ulong),
("dst",c_ulong)
]

def __new__(self,socket_buffer=None):
return self.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_RAM,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)

def IP():
pass