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

I/O operations


File manipulation in Lua is done either on implicit or explicit file descriptors. We will focus on using explicit file descriptors to perform most of the operations.

Note

If we work with implicit file descriptors, by default, Lua will use stdin and stdout, respectively. Alternatively, we can set the output and input descriptor with io.output and io.input.

 

 

Modes

The following file modes are available:

r

Read mode.

w

Write mode.

a

Append mode.

r+

Update mode. This mode preserves the existing data.

w+

Update mode. This mode deletes any existing data.

a+

Append update mode. This mode preserves the existing data and only allows appending at the end of file.

 

Opening a file

The function io.open returns a file descriptor if successful:

   file = io.open (filename [, mode])

When it fails, it will return nil and the corresponding error message (like most Lua functions).

Reading a file

To read a file using an explicit file descriptor, use the function io.read:

   file = io.open(filename)
   val = file:io...