Book Image

Mastering the Nmap Scripting Engine

By : Paulino Calderon
Book Image

Mastering the Nmap Scripting Engine

By: Paulino Calderon

Overview of this book

Table of Contents (23 chapters)
Mastering the Nmap Scripting Engine
Credits
About the Author
Acknowledgments
About the Reviewers
www.PacktPub.com
Preface
Scan Phases
Script Categories
Nmap Options Mind Map
References
Index

Exploring environment variables


There are a few environment variables that you need to consider when writing scripts because they will be helpful:

  • SCRIPT_PATH: This returns the absolute path of the running script

  • SCRIPT_NAME: This returns the running script name

  • SCRIPT_TYPE: This returns "prerule", "hostrule", "portrule", or "postrule"

Use the SCRIPT_NAME environment variable instead of hardcoding the name of your script. This way, you won't need to update the script if you end up changing its name. For example, you could use it to read script arguments as follows:

local arg1 = stdnse.get_script_args(SCRIPT_NAME..".arg1")

The stdnse library will be explored later in this chapter. This library contains the get_script_args() function that can be used to read script arguments.