Processing all messages with NEB
Andreas Ericsson
ae at op5.se
Sun Oct 23 16:25:00 CEST 2005
Mohr James wrote:
> Hi All!
>
> What I need to do is to catch all service messages/text that are sent
> to Nagios, whether done via an active or passive check (i.e.
> send_nsca). I am using the helloworld.c example and I have finally
> figured out how to get pull most of the data. I have a fuction like
> this that usually does what I want:
>
> int helloworld_handle_status(int event_type, void *data){ char
> temp_buffer[1024]; service * tmp_service;
> nebstruct_service_status_data * service_status_data; if(
> (service_status_data=(nebstruct_service_status_data *)data) ){
> tmp_service = (service *) service_status_data->object_ptr;
> snprintf(temp_buffer,sizeof(temp_buffer)-1,"EVENT: %d MESSAGE:
> %s",event_type,tmp_service->plugin_output); }
> write_to_all_logs(temp_buffer,NSLOG_INFO_MESSAGE); /*
> write_to_all_logs("inside:
> helloworld_handle_status",NSLOG_INFO_MESSAGE); */ }
>
> However, when use tmp_service->plugin_output, it says "structure has
> no member named `plugin_output'". Inside of ../include/ojects.h,
> there is the definition of the service_struct, which shows me
>
> char *plugin_output;
>
> However, this is within an the block #ifdef NSCORE.
Which is correct. All NEB-modules must #define NSCORE, since that's
where they'll be running. #ifndef NSCORE is for the cgi's.
> Moving the line
> outside of the block, it will compile but when I send something to a
> service with send_nsca the value of plugin_output ends up being
> null. So, I am at a loss how to get the text of the plugin_output.
>
This is because you're fetching it from
service_status_data->object_ptr->plugin_output which isn't filled in by
the time you get the data.
You need to reference service_status_data->output instead.
Please keep in mind that the neb-code is to be considered fairly
volatile. It's possible (and quite likely) that some of the variables of
the nebstruct_*_data structs will disappear in the next overhaul.
> I have looked at th code for the mysql inserter module. However, I
> get stuck here as well.One thing that is unclear is whether **all**
> messages get sent through here or just the status changes. I need all
> of the messages and not just the status changes.
>
All results of all checks are passed through the modules. Once before
the plugin is executed and once after.
> An additional goal is to be able to process and change the messages
> before being sent to the GUI. For example, the text contains a code
> number which tells the system to change the text to a specific URL so
> all you need to do is click on the message text to get instructions
> on what to do in a specific case. However, I have not yet figured out
> how to change the message that appears in the GUI.
>
You can rewrite it with a module. Make sure you take care not to leak
any memory.
> Any help would be greatly appreaciated.
>
You're on your own when it comes to writing new code. I'll gladly answer
neb-module questions though, so it at least gets documented somewhere.
--
Andreas Ericsson andreas.ericsson at op5.se
OP5 AB www.op5.se
Tel: +46 8-230225 Fax: +46 8-230231
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