Re: Dynamic Preprocessor does not alert and capture packet

[Russ <rucombs () cisco com>]

On 7/9/15 10:09 PM, Big Whale wrote:
> I believe there are already dynamic preprocessor template in the 
> Snort's source code, just like dpx's code and i believe the problem in 
> my config file. Snort seems like no recognizing the preprocessor 
> generator id or whatever it is. Thanks anyway
That, and all the other problems you have encountered, are demonstrated 
by dpx.

Good luck.
Russ
> On Friday, July 10, 2015 9:53 AM, Russ <rucombs () cisco com> wrote:
>
>
> Do have a Snort question?  If you need general help with development, 
> there are more suitable venues like stackoverflow.com.  We really 
> don't have the bandwidth to walk you through your project step by 
> step.  However, if you take the time to build and step through the 
> dynamic preprocessor example 
> (https://www.snort.org/documents/dpx-readme), you will see an event 
> generated in a much simpler piece of code than ssh.  If dpx gives you 
> trouble, let us know.
>
> Russ
>
> On 7/9/15 9:24 PM, Big Whale wrote:
> Are you sure? It worked in my machine. Well if it's bothering you, you 
> can just commented out that function as it is useless for now.
>
>
>
> On Thursday, July 9, 2015 10:51 PM, Hui cao <huica () cisco com> 
> <mailto:huica () cisco com> wrote:
>
>
> Try to run gdb if you have the binary, and set breakpoint at 
> ModSecProcess(), and step through. Here are steps to use gdb 
> (http://cs.baylor.edu/~donahoo/tools/gdb/tutorial.html 
> <http://cs.baylor.edu/%7Edonahoo/tools/gdb/tutorial.html>)
>
> FYI...your code won't compile. You have the following function defined 
> inside function ModSecProcess(void *pkt, void *context).
>
> void removeSubstr(char *string, char *sub) {
>         char *match = string;
>         int len = strlen(sub);
>         while((match = strstr(match, sub))) {
>             *match = '\0';
>             strcat(string, match+len);
>             match++;
>         }
>     }
>
> Best,
> Hui.
> On 07/09/2015 10:41 AM, Big Whale wrote:
> The preprocessor can be loaded but in ModSecProcess() function, the 
> preprocessor supposed to output the alert if the packet matched port 
> 80. But it does not works, so i thought the problem could be the 
> preprocessor rules. I already tried config 
> autogenerate_preprocessor_decoder_rules in snort.conf and define the 
> preprocessor alert generator id in the preprocessor_rules. Yet 
> everything does not seems to work like it supposed to. I am building 
> my preprocessor based on SSH preprocessor. Why don't you try compile 
> and run it locally so you can experience what kind of problem it is.
>
>
>
> On Thursday, July 9, 2015 8:56 PM, Hui cao <huica () cisco com> 
> <mailto:huica () cisco com> wrote:
>
>
> Hi Big Whale,
>
> Can you describe in detail what works and what not? Which decoder 
> rule? Have you seen the rule get triggered in your preprocessor? 
> Again, SSH preprocessor has example how to generate a preprocessor alert.
>
> Best,
> Hui.
>
> On 07/09/2015 12:46 AM, Big Whale wrote:
> I already add "config autogenerate_preprocessor_decoder_rules" in my 
> snort.conf file and put the plugin's alerts in the preprocessor.rules 
> and gen-msg.map. But still no alert from my preprocessor. The 
> preprocessor loaded correctly.
>
>
> ------------------------------------------------------------------------------
> Don't Limit Your Business. Reach for the Cloud.
> GigeNET's Cloud Solutions provide you with the tools and support that
> you need to offload your IT needs and focus on growing your business.
> Configured For All Businesses. Start Your Cloud Today.
> https://www.gigenetcloud.com/
>
>
> _______________________________________________
> Snort-devel mailing list
> Snort-devel () lists sourceforge net  <mailto:Snort-devel () lists sourceforge net>
> https://lists.sourceforge.net/lists/listinfo/snort-devel
> Archive:
> http://sourceforge.net/mailarchive/forum.php?forum_name=snort-devel
>
> Please visithttp://blog.snort.org  <http://blog.snort.org/>  for the latest news about Snort!
>
>
> ------------------------------------------------------------------------------
> Don't Limit Your Business. Reach for the Cloud.
> GigeNET's Cloud Solutions provide you with the tools and support that
> you need to offload your IT needs and focus on growing your business.
> Configured For All Businesses. Start Your Cloud Today.
> https://www.gigenetcloud.com/
>
> _______________________________________________
> Snort-devel mailing list
> Snort-devel () lists sourceforge net 
> <mailto:Snort-devel () lists sourceforge net>
> https://lists.sourceforge.net/lists/listinfo/snort-devel
> Archive:
> http://sourceforge.net/mailarchive/forum.php?forum_name=snort-devel
>
> Please visit http://blog.snort.org <http://blog.snort.org/>for the 
> latest news about Snort!
>
>
>
>
>
>
>
> ------------------------------------------------------------------------------
> Don't Limit Your Business. Reach for the Cloud.
> GigeNET's Cloud Solutions provide you with the tools and support that
> you need to offload your IT needs and focus on growing your business.
> Configured For All Businesses. Start Your Cloud Today.
> https://www.gigenetcloud.com/
>
>
> _______________________________________________
> Snort-devel mailing list
> Snort-devel () lists sourceforge net  <mailto:Snort-devel () lists sourceforge net>
> https://lists.sourceforge.net/lists/listinfo/snort-devel
> Archive:
> http://sourceforge.net/mailarchive/forum.php?forum_name=snort-devel
>
> Please visithttp://blog.snort.org  <http://blog.snort.org/>  for the latest news about Snort!

------------------------------------------------------------------------------
Don't Limit Your Business. Reach for the Cloud.
GigeNET's Cloud Solutions provide you with the tools and support that
you need to offload your IT needs and focus on growing your business.
Configured For All Businesses. Start Your Cloud Today.
https://www.gigenetcloud.com/

_______________________________________________
Snort-devel mailing list
Snort-devel () lists sourceforge net
https://lists.sourceforge.net/lists/listinfo/snort-devel
Archive:
http://sourceforge.net/mailarchive/forum.php?forum_name=snort-devel

Please visit http://blog.snort.org for the latest news about Snort!