Getting Data In

SEDCMD help with Windows DNS logs

chemc
Engager

I am trying to use the SEDCMD when indexing Windows DNS logs as described in this solution:
http://splunk-base.splunk.com/answers/4546/field-extraction-regex-fu-help In a nutshell the Windows DNS logs have the domain name being queried in this format: (6)images(6)google(3)com(0) and I need them in this format images.google.com

I added these items to my props.conf in /opt/splunk/etc/system/local:

[source::/home/dnsuser/Downloads/dns1.log]
sourcetype = windns

[windns]
SEDCMD-domainname = s/(\(\d\))/./g

Then I restarted Splunk, created a new index called DNS and a new data input for the file /home/dnsuser/Downloads/dns1.log. In the data input I manually specified windns as the source type. The data is in there and my field extractions specified in transforms.conf are working fine as I can see them by specifying either index=dns or sourcetype=windns.

The domain name is extracted to a field called dns_query. When I view that field in the search results the domain name has not been modified by the SEDCMD. I know the syntax of the SEDCMD is correct because I can use it this way and the domain names are in the proper format:

index=dns | rex "((?(\w+((\d))){1,}?)$)" | rex mode=sed field=dns_query "s/(\(\d\))/./g"

Any help would be appreciated.

landen99
Motivator
SEDCMD-domainname = s/(\(\d+\))/./g

You had an extra "\" and needed an extra "+"

0 Karma

the_wolverine
Champion

If you're using a LightForwarder or Universal Forwarder the SEDCMD configuration needs to exist on the indexer(s) which actually performs the parsing work.

0 Karma

ageld
Path Finder

I am having the same issue. On the Universal forwarder (Windows host) I have configured the following in $SPLUNK_HOME/etc/system/local/props.conf:

[sourcetype::DNSSrvLog]
SEDCMD-dns_name = s/((\(\d+\))/./g

and logs appeared not changed on the indexer

I tried different REGEXes. The one above. The ones below:

s/(\(\d+\))/./g

s/(\(\d+\))/./g

s/\(\d+\)/./g

s/(\d+)/./g

None of that worked. Any assistance will be appreciated.

0 Karma

landen99
Motivator

SEDCMD doesn't work on the UF

0 Karma
Got questions? Get answers!

Join the Splunk Community Slack to learn, troubleshoot, and make connections with fellow Splunk practitioners in real time!

Meet up IRL or virtually!

Join Splunk User Groups to connect and learn in-person by region or remotely by topic or industry.

Get Updates on the Splunk Community!

Get Agentic with Splunk Lantern: Connect to Cisco Cloud Control, Transform ...

Splunk Lantern is Splunk’s customer success center that provides practical guidance from Splunk experts on key ...

July Community Events: Master ITSI 5.0 & Automate Splunk

Struggling with alert fatigue or feeling like you're spending more time on infrastructure maintenance than ...

New Release of Federated Search: Bringing Splunk Analytics to More of Your Data

Organizations today are generating more data than ever and storing it across cloud object stores, data lakes, ...