端口扫描

三次握手

import pyfiglet
import sys
import socket
from datetime import datetime

ascii_banner = pyfiglet.figlet_format("PORT SCANNER")
print(ascii_banner)

target = "127.0.0.1"

# Add Banner
print("-" * 50)
print("Scanning Target: " + target)
print("Scanning started at:" + str(datetime.now()))
print("-" * 50)

try:
    # will scan ports between 1 to 65,535
    for port in range(1, 500):
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        socket.setdefaulttimeout(1)

        # returns an error indicator
        result = s.connect_ex((target, port))
        if result == 0:
            print("Port {} is open".format(port))
        s.close()

except KeyboardInterrupt:
    print("\n Exiting Program !!!!")
    sys.exit()
except socket.gaierror:
    print("\n Hostname Could Not Be Resolved !!!!")
    sys.exit()
except socket.error:
    print("\ Server not responding !!!!")
    sys.exit()