Snort mailing list archives
Re: how to create testing data files??
From: Ryan Jordan <ryan.jordan () sourcefire com>
Date: Mon, 16 Aug 2010 10:30:04 -0400
[quote] Note that Snort will not try to determine whether the files under that directory are really pcap files or not. [/quote]
This means that your directory better have pcap files in it, because Snort's going to try and load them as pcaps! :) Perhaps this is something we can make a little more clear. When I'm testing rules or things I've developed, I typically use Scapy to craft pcaps. At one point, I used the following setup for more rapid (but less repeatable!) testing: Get 2 hosts. I used my workstation and a VM. On one end, named "foobar", run netcat in listen mode: [ryan@foobar]$ nc -l -p 5555 On the other end, connect with netcat: [ryan@snortdev]$ nc foobar 5555 On the client's end, I ran Snort with my rules to test. I used a BPF to get only this traffic: [ryan@snortdev]$ snort -c testing.conf -i eth0 -F my_bpf.txt -A cmg -k none The contents of my BPF: [ryan@snortdev]$ cat my_bpf.txt host foobar and port 5555 Finally, I can just type stuff into my netcat window and watch the alerts pop up in my Snort window. I found this to be useful when I was debugging some pattern matcher weirdness in the Sensitive Data preprocessor. This approach is less useful if you want to save your tests and script them up to be run later -- pcaps are great for this. You'll also run into trouble if you want to test a more complex protocol than raw text over TCP, but we'll save that for another day. :) -Ryan On Sat, Aug 14, 2010 at 3:35 PM, waldo kitty <wkitty42 () windstream net> wrote:
how can we create data files and test rules without having to create pcaps? i've tried creating a file with some test strings in it and feeding it to snort via the various pcap reading methods but snort always whines "bad dump file format" and quits... the snort 2.8.6.1 manual specifically states, in section 1.7.2 at the bottom of page 16... [quote] Note that Snort will not try to determine whether the files under that directory are really pcap files or not. [/quote] that indicates that we can create a "text" file and feed it to snort... what am i missing?? i get the following output from snort... snort --pcap-file=ptest.txt [...] TCPDUMP file reading mode. Reading network traffic from "/home/user/pcaps/test" file. ERROR: Unable to open file "/home/user/pcaps/test" for readback: bad dump file format Fatal Error, Quitting.. ------------------------------------------------------------------------------ This SF.net email is sponsored by Make an app they can't live without Enter the BlackBerry Developer Challenge http://p.sf.net/sfu/RIM-dev2dev _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://www.geocrawler.com/redir-sf.php3?list=snort-users
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Current thread:
- Re: how to create testing data files??, (continued)
- Re: how to create testing data files?? Rob MacGregor (Aug 14)
- Re: how to create testing data files?? waldo kitty (Aug 14)
- Re: how to create testing data files?? waldo kitty (Aug 14)
- Re: how to create testing data files?? Joel Esler (Aug 14)
- Re: how to create testing data files?? waldo kitty (Aug 14)
- Re: how to create testing data files?? Joel Esler (Aug 14)
- Re: how to create testing data files?? waldo kitty (Aug 14)
- Re: how to create testing data files?? Joel Esler (Aug 15)
- Re: how to create testing data files?? waldo kitty (Aug 17)
- Re: how to create testing data files?? Rob MacGregor (Aug 14)
- Re: how to create testing data files?? waldo kitty (Aug 14)
- Re: how to create testing data files?? waldo kitty (Aug 17)
- Re: how to create testing data files?? Russ Combs (Aug 20)
- Re: how to create testing data files?? Russ Combs (Aug 31)