[Bro] three things

[Mike Dopheide]

The packet you have printed is part of a DNS request (I think).  I've 
been having problems specifically with the kerberos AS_REQ packets also 
included in the trace file that apparently have different special 
characters.  (I apologize if that wasn't clear.)

Instead of:
udp_content_deliver_all_orig = T;

Try:
redef udp_content_delivery_ports_orig = { [88/udp] = T };
redef udp_content_delivery_ports_resp = { [88/udp] = T };

event udp_contents(u: connection, is_orig: bool, contents: string)
{
        local mystring: string = sub_bytes(contents,47,(number+8-47));
        print dop, fmt("%s",mystring);
        if(mystring == /.*NCSA.*/ ){
                print dop, fmt("YAY");
        }
}

I'm expecting your output to be:
dopheide\xa2^J\x1b^HNCSA.EDU
afsman\xa2^J\x1b^HNCSA.EDU

Rather than:
dopheide\xa2^J\x1b^HNCSA.EDU
YAY
afsman\xa2^J\x1b^HNCSA.EDU
YAY

-Mike

Robin Sommer wrote:
> On Wed, Jan 31, 2007 at 18:01 -0600, Mike Dopheide wrote:
> 
>> Trace attached.  You'll need to run bro with -C to ignore checksum errors.
> 
> Works for me:
> 
>       \xab\xf2^A\0\0^A\0\0\0\0\0\0^P_kerberos-master^D_udp^DNCSA^CEDU\0\0!\0^A
>       T
> 
> With this script again:
> 
>       redef udp_content_deliver_all_orig = T;
> 
>       event udp_contents(u: connection, is_orig: bool, contents: string)
>       {
>          print contents;
>          print /NCSA/ in contents;
>       }
> 
> So, how does your script look like?      
> 
> Robin
>