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Re: Network Variables
From: "Seth Dunn" <seth () d2ms com>
Date: Thu, 2 May 2013 10:09:23 -0400

Also of note.
It seems that if snort starts with a bpf file configured....then for
whatever reason, all traffic is no longer monitored, even though snort
has started.
So while this rule::
not net 10.10.0.0/24 and dst host 10.75.45.1 && dst port 80 or not net
10.30.0.0/24 and dst host 10.75.45.1 && dst port 80

is pretty specific.....
I have another rule set in my local.rules file that should alert on any
FTP attempt to IP 10.76.65.1....and if the bpf file is configured for
snort, then the attempt is not alerted by snort.
If I remove the bpf file from being used, then any FTP attempt is again
alerted.

 

From: James Lay [mailto:jlay () slave-tothe-box net] 
Sent: Thursday, May 02, 2013 8:10 AM
To: Snort
Subject: Re: [Snort-users] Network Variables

 

Quotation marks may be needed...try appending via command line as well.

 

James

 

On May 2, 2013, at 5:50 AM, Seth Dunn <seth () d2ms com> wrote:





What is DAQ?  I have seen that, but have no idea what that is.

As far as my bpf file goes, if it is like this::

 

#not net 10.10.0.0/24 and not net 10.30.0.0/24

not net 10.10.0.0/24 and dst host 10.75.45.1 && dst port 80 or not net
10.30.0.0/24 and dst host 10.75.45.1 && dst port 80


It will fail with::

Reading filter from bpf file: D:\Snort\etc\ignore2.bpf

ERROR: short read D:\Snort\etc\ignore2.bpf (169 != 170)

Fatal Error, Quitting..

 

If I remove the commented line, then snort starts fine.
If I try to have multiple lines in the file, (all being rules, no
comments) the it will fail with a similar error as above.
I have never seen a DAQ error.

 

From: Russ Combs [mailto:rcombs () sourcefire com] 
Sent: Thursday, May 02, 2013 12:08 AM
To: waldo kitty
Cc: snort-users () lists sourceforge net
Subject: Re: [Snort-users] Network Variables

 

Snort does allow comments in the BPF file, starting with # to end of
line.  If there is a syntax error, you should see something like:

 

ERROR: Can't set DAQ BPF filter to '

...      

' (pcap_daq_set_filter: pcap_compile: syntax error)!

Fatal Error, Quitting..

 

What DAQ are you using?  Please send the BPF file that fails and the
error that you get.

 

On Wed, May 1, 2013 at 10:07 PM, waldo kitty <wkitty42 () windstream net
<mailto:wkitty42 () windstream net> > wrote:

On 5/1/2013 13:09, Seth Dunn wrote:
But any ideas why snort fails to start if I add in a '#' to comment a
line??

i have no clue but it sounds like a coding error not allowing comment
lines i
the BPF file... only joel or one of the snort dev guys can tell us
that... or
possibly a code diver who can root around in the snort code ;)


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