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

Flow control structures


Some classic control structures are implemented in Lua, such as the if-then conditional statements, a few different loop types, and the break and continue functions. Let’s review those structures briefly.

Conditional statements - if, then, elseif

The if-then conditional statement evaluates an expression and executes a block of code if true:

   if status.body then
     --Do something
   end

Lua also supports an else-if conditional statement with the keyword elseif:

   if status.body then 
     --Do something
   elseif
     --Do something else
   end

Note

If-then statements must end with the terminator keyword end.

Loops - while

The while loop works similarly in other programming languages:

   local x = 1
   while(x<1337)
     print x
     x = x + 1
   end

Note

While loops must end with the terminator keyword end.

Loops - repeat

The repeat loop runs the body until the set condition becomes true:

   done = false
   repeat
     --Do something
   until done

Loops - for

There are two...