Plugin Output

[Jason Marshall]

>From what I could make of the source, yes.  But I could well be wrong.  I
don't know if the limit applies to just named pipes, or all IPC...

> I know the size limit when writing to the command pipe, but why does the 
> same rule apply for plugins writing back to the daemon.  Why can't 
> nagios be modified to handle a larger response from the plugin?  Does 
> the same pipe limitation for external commands exist within the daemon?
> 
> Russell Scibetti
> 
> Jason Marshall wrote:
> 
> >>#define MAX_PLUGINOUTPUT_LENGTH            352
> >>
> >
> >Russell, that value, plus 160 bytes of miscellanous stuff, equals 512
> >bytes (that's not the interesting part).
> >
> >The interesting part is that's the max size for atomic read/write
> >operations on a names pipe in Linux.
> >
> >On my Solaris Nagios box, it's 5120 for the same atomic operation size
> >limitation, so I bumped up all the relevant stuff by 1024 bytes, and it
> >works fine.
> >
> >I'm not sure where the perfdata would be carried in this case.  If it goes
> >through the names pipe (probably), it may cause big problems if you're
> >reading and writing to and from the command file in chunks bigger than 512
> >bytes...
> >
> >Unfortunately, it's going to be hard to verify if there is (or isn't) a
> >real problem, if you make the change.  You may end up with command-file
> >commands being mangled, but maybe so infrequently that you could discount
> >them...  Maybe...
> >
> >---
> >Jason Marshall, Unix Geek, Kelman Technologies, Inc., Calgary, AB, Canada.
> >
> >  From a Sun Microsystems bug report (#4102680):
> >    "Workaround: don't pound on the mouse like a wild monkey."
> >
> >  "I have great faith in fools: 
> >     Self confidence my friends call it."  -Edgar Allan Poe
> >
> >
> >
> >
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> >::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. 
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> >
> >
> 
> -- 
> Russell Scibetti
> Quadrix Solutions, Inc.
> http://www.quadrix.com
> (732) 235-2335, ext. 7038
> 
> 
> 

---
Jason Marshall, Unix Geek, Kelman Technologies, Inc., Calgary, AB, Canada.

  From a Sun Microsystems bug report (#4102680):
    "Workaround: don't pound on the mouse like a wild monkey."

  "I have great faith in fools: 
     Self confidence my friends call it."  -Edgar Allan Poe




-------------------------------------------------------
This SF.NET email is sponsored by: FREE  SSL Guide from Thawte
are you planning your Web Server Security? Click here to get a FREE
Thawte SSL guide and find the answers to all your  SSL security issues.
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_______________________________________________
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::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. 
::: Messages without supporting info will risk being sent to /dev/null