[Snort-users] tcpdump script

Bamm Visscher bamm.visscher at ...11827...
Tue Apr 7 20:10:16 EDT 2009


I use daemontools  instead of Snort for packet logging.
log_packets.sh is a simple shell script that manages daemontools out
of root's cron. I like to keep two weeks of pcap stored in directories
based on date. WIth the timestamp appended to the filename, finding
the packets associated with a particular flow is "simple".


On Tue, Apr 7, 2009 at 5:07 PM, Jefferson, Shawn
<Shawn.Jefferson at ...14448...> wrote:
> Hi,
> I wanted to run tcpdump to capture all traffic on my snort sensor, so that
> if I want to go take a look at traffic based on snort alerts I could get
> more context.  I’ve setup a couple of scripts to gzip the packet captures
> and send them to a storage server.  My question is about starting tcpdump
> itself.  I tried doing it in the same script that starts snort and barnyard,
> but this didn’t seem to work and I think it’s due to the fact that tcpdump
> needs to be run as root (?).
> So, I’ve created a root cron job that runs every five minutes will start
> tcpdump if it finds it not running (using “pidof tcpdump”).
> Not being a linux guru, is this the right way to approach this problem?
> Thanks,
> Shawn
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