One of the first steps in attacking a computer is to see which network ports are open. It is also an important step in network security, because a hacked machine often has extra ports that are open. This is especially true with a botnet or worm. The existence of an unexpectedly open

Were (you all) are going to write a simple port scanner.

Write a program, in python, that will:

take an IP address from the command line.

take a lower port number from the command line.

take an upper port number from the command line.

It will then try to connect the (IP,port) for all ports between (and including) the lower port and the higher port numbers. It will log those ports that were successfully connected. Remember to disconnect if there was a successful connection. It can just print this information to stdout.

./scanner.py 127.0.0.1 80 2000

port 80 is open

port 443 is open

These ports might not be open on localhost (127.0.0.1) on snowball. So dont get upset if your output is different.