Nmap: Network Exploration and Security Auditing Cookbook - Second Edition

How to do it...

Creating a library has a similar process to writing scripts. Always consider the scope of the variables that you are working with. Let's begin by creating an NSE library in Lua:

1. Create a new file mylibrary.lua, and declare the required libraries you need and set the _ENV upvalue:

   local math = require "math"    _ENV = stdnse.module("mylibrary", stdnse.seeall) 

2. Now, simply write the functions of your library(mylibrary.lua) and return _ENV at the end of the file. Ours will only contain one function that returns the classic "Hello World!" message:

   function hello_word()      return "Hello World!"    end    return _ENV; 

3. Place your new library file inside the directory /nselib/. Create a new NSE script, place it in the script folder, ...