Fake port-scanning reply

In this section, we will look at how to give a fake reply at the TCP layer. The program will give fake replies to open ports. For this code, we are going to use the scapy library because the TCP header is very complicated to make. The program name is tcp_trap.py:

• Use the following library and module:

      import socket
      import struct
      import binascii
      import Queue
      from scapy.all import *
      import threading

• A raw socket has been created to receive incoming packets as follows:

      my_socket = socket.socket(socket.PF_PACKET, socket.SOCK_RAW, 8)
      Q = Queue.Queue()

• The following function receives the incoming TCP/IP packets. A lot of lines have already been discussed in Chapter 3, Sniffing and Penetration Testing. The  if (D_port==445 or D_port==135 or D_port==80): syntax shows that we are only interested in ports  445, 135, and 80:

      def receiver():
        while True:
        try:
         pkt = my_socket.recvfrom(2048)
         num=pkt...