008_black_hat_python/p39_chapter_03_sniffer_ip_header_decode.py at master · jerry-0824/008_black_hat_python · GitHub

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# /usr/bin/python python3
# -*- coding:utf-8 -*-
##################################################
# Filename: p37_chapter_03_sniffer.py
# Author:   jerry_0824
# Email:    63935127##qq.com
# Phone:    +86-155-8287-7999
# Date:     2016-03-06
# Version:  v1.0.0
# Ref0:     http://stackoverflow.com/questions/29306747/python-sniffing-from-black-hat-python-book/
##################################################

import socket
import os
import struct
from ctypes import *

# host to listen on
host = "192.168.1.140"

# our IP header
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)
        ("src", c_uint32),
        ("dst", c_uint32)
    ]

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

    def __init__(self, socket_buffer=None):

        # map protocol constants to their names
        self.protocol_map = {1:"ICMP", 6:"TCP", 17:"UDP"}

        # human readable IP addresses
        self.src_address = socket.inet_ntoa(struct.pack("<L",self.src))
        self.dst_address = socket.inet_ntoa(struct.pack("<L",self.dst))

        # human readable protocol
        try:
            self.protocol = self.protocol_map[self.protocol_num]
        except:
            self.protocol = str(self.protocol_num)

# this should look familiar from the previous example
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:

        # read in a packet
        raw_buffer = sniffer.recvfrom(65565)[0]

        # create an IP header from the first 20 bytes of the buffer
        ip_header = IP(raw_buffer[0:20])

        # print out the protocol that was detected and the hosts
        print("Protocol: %s %s -> %s" % (ip_header.protocol, ip_header.src_address, ip_header.dst_address))

# handle CTRL-C
except KeyboardInterrupt:
    # if we're using Windows, turn off promiscuous mode
    if os.name == "nt":
        sniffer.ioctl(socket.SIO_RCVALL, socket.RCVALL_OFF)