You will be completing a series of labs for this course. For this week, you will be submitting the Week 7 Lab(s).

You can download the series of Word files containing all of the labs below. You can also find the same bundle located in the Files section of the course.

CIS115 Week 7 Lab Overview

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)