Book Image

Nmap: Network Exploration and Security Auditing Cookbook - Second Edition

By : Paulino Calderon
Book Image

Nmap: Network Exploration and Security Auditing Cookbook - Second Edition

By: Paulino Calderon

Overview of this book

This is the second edition of ‘Nmap 6: Network Exploration and Security Auditing Cookbook’. A book aimed for anyone who wants to master Nmap and its scripting engine through practical tasks for system administrators and penetration testers. Besides introducing the most powerful features of Nmap and related tools, common security auditing tasks for local and remote networks, web applications, databases, mail servers, Microsoft Windows machines and even ICS SCADA systems are explained step by step with exact commands and argument explanations. The book starts with the basic usage of Nmap and related tools like Ncat, Ncrack, Ndiff and Zenmap. The Nmap Scripting Engine is thoroughly covered through security checks used commonly in real-life scenarios applied for different types of systems. New chapters for Microsoft Windows and ICS SCADA systems were added and every recipe was revised. This edition reflects the latest updates and hottest additions to the Nmap project to date. The book will also introduce you to Lua programming and NSE script development allowing you to extend further the power of Nmap.
Table of Contents (25 chapters)
Title Page
Credits
About the Author
Acknowledgments
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface
13
Brute Force Password Auditing Options
17
References and Additional Reading

Coroutines


Coroutines allow collaborative multitasking and are a very interesting aspect of Lua. Keep in mind that coroutines are not threads. Using coroutines will help you save time when you need different workers using the same context, and it also produces code that is easier to read and therefore maintain.

Creating a coroutine

To create a coroutine, use the function coroutine.create. This function only creates the coroutine but is not actually executed:

   local nt = coroutine.create(function()
        print("w00t!")
    end)

Executing a coroutine

To execute a coroutine, use the function coroutine.resume:

   coroutine.resume(<coroutine>)

You can also pass parameters to the coroutine function as additional arguments to the coroutine.resume function:

   local nt = coroutine.create(function(x, y, z)
        print(x,y,z)
    end)  
    coroutine.resume(nt, 1, 2, 3)

The output will be as follows:

   1,2,3

Note

There is a function named coroutine.wrap that can replace the need of running coroutine...