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

Common data structures


In Lua, you will use the data type table to implement all your data structures. This data type has great features, such as being able to store functions and being dynamically allocated, among many others. Hopefully, after reviewing some common data structures, you will find yourself loving their flexibility.

Tables 

Tables are very convenient and allow us to implement data structures, such as dictionaries, sets, lists, and arrays, very efficiently. A table can be initialized empty or with some values:

   T1={} --empty table
   T2={"a","b","c"}

Integer indexes or hashkeys can be used to assign or dereference the values in a table. One important thing to keep in mind is that we can have both types in the same table:

   t={}
   t[1] = "hey "
   t["nmap"] = "hi " --This is valid

To get the number of elements store in a table you may prepend the # operator:

   if #users>1 then
   print(string.format("There are %d user(s) online.", #users))
    --Do something else
   end

Note...