Splunk Search

How do I send syslog data to nullQueue from a single source IP but multiple destination IPs?

Contributor

I am receiving Syslog data from the firewall and I would like to send a subset of it to the nullQueue.

The issue I am having is that I have two set values (action and srcip) but 6 values for the destination.

The formats of the fields of the raw data are -

action="deny" scrip=10.12.55.55 dstip=192.168.10.0 

The regex I have come up with is:

(?:srcip\=10\\.12\\.55\\.55)|(?:dstip\=192\\.168\\.10\\.*)|(?:dstip\=172\\.16\\.10\\.*)|(?:dstip\=172\\.18\\.10\\.*)|(?:action\=\"deny\")

What happens is that the "|" acts as an "or" so I will be dumping too much information.

My question is what is the format to place in transforms.conf to filter out the events to be dropped?

Regards,

Scott

0 Karma

Legend

Hi @scottrunyon,
it's not clear for me if you want to discard the events whereall the three conditions are true ( action="deny" scrip=10.12.55.55 dstip=192.168.10.0) or only events where the condition 1 and 2 or 3 are true ( action="deny" AND (scrip=10.12.55.55 OR dstip=192.168.10.0)).
If the first, the regex is easy:

action="deny" scrip=10.12.55.55 dstip=192.168.10.0

you can test it at https://regex101.com/r/ROejtS/1
if the second:

action\=\"deny\" (scrip\=10\.12\.55\.55)|(dstip=192\.168\.10\.0)

that you can test at https://regex101.com/r/ROejtS/2

Use always Code Sample button (101010) to insert a regex in a question, otherwise we cannot see your regex.

Ciao.
Giuseppe

0 Karma

Contributor

Giuseppe,
Thanks for the response. I want to dump the events where action="deny" and scrip=10.12.55.55 are always present and there can be multiple dstip entries. Based on your answer, will the regex in transforms.conf look like this?

(?:action=\"deny\") (?:srcip=10.12.55.55) (?:dstip=192.168.10.)|(?:dstip=172.16.10.)|(?:dstip=172.18.10.)

Regards,

Scott

0 Karma

Contributor

Giuseppe,

I ended up adding a seperate transforms.conf entry for each dstip. After testing, it appears to be working.

Regards,

Scott

0 Karma