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Assignment

Run on Repl.it

Create a port scanner using Python.

In the port_scanner.py file, create a function called get_open_ports that takes a target argument and a port_range argument. target can be a URL or IP address. port_range is a list of two numbers indicating the first and last numbers of the range of ports to check.

Here are examples of how the function may be called:

get_open_ports("209.216.230.240", [440, 445])
get_open_ports("www.stackoverflow.com", [79, 82])

The function should return a list of open ports in the given range.

The get_open_ports function should also take an optional third argument of True to indicate "Verbose" mode. If this is set to true, the function shourd return a descriptive string instead of a list of ports.

Here is the format of the string that should be returned in verbose mode (text inside {} indicates the information that should appear):

Open ports for {URL} ({IP address})
PORT     SERVICE
{port}   {service name}
{port}   {service name}

You can use the dictionary in common_ports.py to get the correct service name for each port.

For example, if the function is called like this:

port_scanner.get_open_ports("scanme.nmap.org", [20, 80], True)

It should return the following:

Open ports for scanme.nmap.org (45.33.32.156)
PORT     SERVICE
22       ssh
80       http

Make sure to include proper spacing and new line characters.

If the URL passed into the get_open_ports function is invalid, the function should return the string: "Error: Invalid hostname".

If the IP address passed into the get_open_ports function is invalid, the function should return the string: "Error: Invalid IP address".

Development

Write your code in port_scanner.py. For development, you can use main.py to test your code. Click the "run" button and main.py will run.

Testing

The unit tests for this project are in test_module.py. We imported the tests from test_module.py to main.py for your convenience. The tests will run automatically whenever you hit the "run" button.

Submitting

Copy your project's URL and submit it to freeCodeCamp.

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