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

Metatables


Metamethods allow us to change the behavior of a table by writing custom functions for operators, such as comparing objects and arithmetical operations. For example, let’s say we would like to overload the add functionality of our table object with a new function that adds up certain field. Normally, the addition operation isn’t valid on tables, but we can overwrite the metamethod __add to perform whatever we need.

Arithmetic methamethods

The following are the methamethods available:

 

__add

Addition operator

__mul

Multiplication operator

__sub

Subtraction operator

__div

Division operator

__unm

Negation operator

__pow

Exponentiation operator

__concat        

Concatenation operator

Relational methamethods

The following are the relational methamethods available:

__eq

Equality

__lt

Less than

__le

Less than or equal to

The function setmetatable is used to set the metastable of a table: 

   local vuln1 = {criticity_level = 10, name="Vuln #1"}
   local vuln2= {criticity_level = 4, name="Vuln #2"}
   local mt...