Title of Lab: Networking with Python

Deliverables

• A source code Python file.
• A Word document containing both source code and the screen print of the program outputs.

Lab Steps

Part 1 Finding your IP address

We will create a python program to do a port scan. To do this you need to find the ip address of your computer. Open a Command Prompt (Start button -> Windows System-> Command Prompt). At the command prompt type ipconfig all

In the above example the IP address is IPv4 192.168.15.149

Part 2 Running Your Code

After you have set up your router we will create a python program to do a port scan. Open Idle create a new file. Enter the following python code to create a port scanner. NOTE - do not run the port scanner on any site except your router and your own machine.

#!/usr/bin/env python

import socket

import subprocess

import sys

from datetime import datetime

# Clear the screen

subprocess.call('clear', shell=True)

# Ask for input

remoteServer = input("Enter a remote host to scan: ")

remoteServerIP = socket.gethostbyname(remoteServer)

# Print a nice banner with information on which host we are about to scan

print ("-" * 60)

print ("Please wait, scanning remote host", remoteServerIP)

print ("-" * 60)

# Check what time the scan started

t1 = datetime.now()

# Using the range function to specify ports (here it will scans all ports between 1 and 1024)

# We also put in some error handling for catching errors

try:

 for port in range(1,1025): 

 sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

 result = sock.connect_ex((remoteServerIP, port))

 if result == 0:

 print ("Port {}: Open".format(port))

 sock.close()

except KeyboardInterrupt:

 print ("You pressed Ctrl+C")

 sys.exit()

except socket.gaierror:

 print ("Hostname could not be resolved. Exiting")

 sys.exit()

except socket.error:

 print ("Couldn't connect to server")

 sys.exit()

# Checking the time again

t2 = datetime.now()

# Calculates the difference of time, to see how long it took to run the script

total = t2 - t1

# Printing the information to screen

print ("Scanning Completed in: ", total)

Run the above code and enter the IP address of the machine (note the machine above is 192.168.8.113). This will take several minutes - even up to 10 minutes so please be patient! You may also try entering in the ip address of your router (shown below)