Environment variables

The following are the environment variables used in preparing an Nmap script:

• SCRIPT_PATH: This describes the path of the script
• SCRIPT_NAME: This describes the name given to the script
• SCRIPT_TYPE: This variable is used to describe the type of rule which has invoked by the script for a remote host

The following is a structure of a simple Nmap script:

//Rule section
portrule = function(host, port)
    return port.protocol == "tcp"
            and port.number == 25
            and port.state == "open"
end

//Action section
action = function(host, port)
    return "smtp port is open"
end