Add VLAN tags to all Zeek logs

This script adds VLAN tags to all of the Zeek logs that have the conn_id (id) field.

Installation

zkg refresh
zkg install corelight/log-add-vlan-everywhere

Usage

All Zeek logs that contain connection information with the c$id field
should have fields that indicate VLAN tags (named vlan and inner_vlan).

Potential Side Effects

There are potential side effects from loading this script if another script is indexing tables based on the c$id field. This generally is not done in most modern scripts and is not done in the core Zeek distribution anywhere.

This script tries to avoid potential trouble with this indexing issue by
only grabbing the VLAN information from the connection_established
event because any other script that uses c$id for indexing would probably always get the value that was collected already anyway.

If you think that this script is impacting any other script please reach out
to us at support@corelight.com and let us know what script you think it might be impacting.

Authors

Nate Guagenti @neu5ron
Seth Hall <seth@corelight.com>