part2 (1 Coding a simple port scanner)
This article is just to provide a sample code to generate a Port Scanner. This Port Scanner will work for both the Web Applications as well as remote Host. This tool has been created to provide the basic functionality of a Port Scanner. The general concept of Sockets had been used to provide the functionality. Port Scanner is built on Python 3 and uses some extra libraries such as socket and pyfiglet (for a fancy banner).
Please find the below source code for the Port Scanner :
Source Code
import pyfiglet
import sys
import socket
from datetime import datetime
ascii_banner = pyfiglet.figlet_format(“PORT SCANNER”)
print(ascii_banner)
# Defining a target
if len(sys.argv) == 2:
# translate hostname to IPv4
target = socket.gethostbyname(sys.argv[1])
else:
print(“Invalid ammount of Argument”)
# 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(1,65535):
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 Exitting Program !!!!”)
sys.exit()
except socket.gaierror:
print(“n Hostname Could Not Be Resolved !!!!”)
sys.exit()
except socket.error:
print(” Server not responding !!!!”)
sys.exit()
Output:
python-port-scanner
ipv4
