Python Penetration Testing Cookbook

How to do it...

The steps to create a TCP ACK scanner with Scapy are as following:

1. As usual, import the required modules and set the variables. Also, define the method to check the status of the host:

from scapy.all import * 
# define the host, port 
host = 'rejahrehim.com' 
ip = socket.gethostbyname(host) 
port = 80 
# define the method to check the status of host 
def is_up(ip): 
    icmp = IP(dst=ip)/ICMP() 
    resp = sr1(icmp, timeout=10) 
    if resp == None: 
        return False 
    else: 
        return True 

2. To send a TCP packet with the ACK flag, update the probe_port method in the previous recipe, as follows:

def probe_port(ip, port, result = 1): src_port = RandShort() try: p = IP(dst=ip)/TCP(sport=src_port, dport=port, flags='A', seq=12345) resp = sr1(p, timeout=2) ...