Original subtitles

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Writing an NSC script to unwrap offers script support on many topics since it is open source the scripts

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are constantly increasing by the day or even the existing scripts are improved therefore that means

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that you can write your own and map script.

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Now of course it may indeed be necessary if you can't find a script that is more relevant to a crawl

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that you want to do so all information about and map scripting engine or NSC can be found here and map

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that word on map scripts are written in the lua programming language if you're not necessarily familiar.

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I'll tell you that some rules must be followed when writing script.

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There are certain parts it must be included in the script and this is because then map runs each script

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in a certain sequence starting from the first line of the script.

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It'll run step by step according to the rules so a script that is not written correctly will fail.

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So when writing scripts will then map we don't have to write everything ourselves.

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There is an map API support which means that many processes that we will be using are already defined

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in map and we need to do is call the relevant process with the help of the map API.

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So you can access the map API libraries at this site.

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Now the NSC script consists of the following main paints the head description categories dependencies

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author license description field description field tells the subject of this script and what it does.

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Depending on the length and complexity of the script the description can be several lines think a brief

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summary would often be more understandable.

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Categories so the fields that the script is included in are specified so one or more fields can be included.

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There is no case sensitivity when specifying names for domains.

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You can go to and map dawg at this address.

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For example categories equals default discovery safe etc..

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Author feel information about the person who wrote the script.

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Using an email address is not recommended.

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License for license information is required to use a script and all scripts use and map licenses because

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then map is open source software so it's efficient to specify the following in the script license equals.

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Same as in map we can look at this page to get that

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dependency fields so if there is another script in this field that will be used beforehand before the

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execution of the script.

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Gonna be specify here when writing scripts you should list the scripts that should work in advance according

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to the scenario that we have determined.

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For example dependencies equals SMB boot the rule the rules that will be executed in the script.

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Here are specified rules are lua commands that run in sequence and return true or false.

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So script must contain one or more of the following functions that determine when to run the script.

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3 rule a host rule that most words rule host work and post rule a so pre rule scripts are executed 1

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before any host is scanned in the script pre scan phase so after each host is scanned the hosts rule

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import rules scripts are executed most rule scripts run ones.

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After all the hosts your scan and a script can run in multiple stages if it has several rules.

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Three rule and post rule do not accept arguments post rule accepts a host table and can for example

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test the IP address or hostname of the destination port rule.

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Open open accepts a support table for any port and filtered or unfiltered port states port rules often

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test factors such as port number port status or listening service name when deciding a port and have

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example rules are shown in the section entitled rule the standard to choose between a pre rule or a

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post rule is if the script is doing computer discovery or other network operation then the pre rule

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should be used.

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Post rule is reserved for reporting data and statistics collected during scanning

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the action action is the heart of an NSC script the script preparation includes all instructions that

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must be executed in the port rule.

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Host rule or post rule triggers a lua function that accepts the same arguments as a rule the value returned

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by the action value can be a table of name value pairs a string or zero environment variables.

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So each script has its own set of environment variables script part obviously the script path script

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name is the name and this variable can be used in a debug output.

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Script Type 2 so since a script can have more than one rule function this environment variable indicates

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which rule has enabled the script which is very useful if the script wants to share some code between

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different script scanning phases.

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So how about some examples script writing now let's write an examples script and then scan with a script.

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So let's write a script to show if the DNS Board is on a raw so the script must be registered in this

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directory in order to be used by the end map program so open v M's open Kelly log any county user.

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Root password tour open terminal now write in leaf pad.

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User share and map scripts test that NFC course you can use it in another text editor will will speed

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up by using the notes I've prepared before so versus right.

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Head description equals.

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So this is a simple script example that determines if it DNS port is open or not.

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Right.

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Author equals non byte.

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Now let's write rule.

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So here our script will scan and list ESPN UDP ports on the target system.

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Rule what rule equals function most port return port dot protocol equals equals DCP and port dot state.

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Equals equals open return port dot protocol equals equals UDP and port dot state equals equals open

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and an action will list the results action equals function.

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Most port return this port is open

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bicyclists record what we do now.

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So on the command line and map script test then dot 0 dot to dot for P fifty three U.S. u s t press

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Enter okay.

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So as you can see our script works and the results were listed so the subject of scripts is completely

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dependent on your programming knowledge and your imagination so if you define what you want to do you

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will have completed really the most important stage the Internet's gonna help you with the rest well

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and help you with this anyway.

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So remember you can always contribute to end map by sharing your scripts.