> Hi,
>
> I need to enter informations in "passive check" services via the FIFO
> (command file).
>
> The problem is : The size of the buffer used to store Status Informations is
> too small (332 bytes). The datas are truncated.
>
> I found the #define value ( include/objects.h : MAX_PLUGINOUTPUT_LENGTH )
> and extend it to 10240 but the datas are still truncated ( around 1024 bytes
> ).
>
> I found another #define for the size of a buffer used to store the complete
> input string ( include/common.h : MAX_INPUT_BUFFER ) which is set to 1024.
> But extending its value does not seem enough : Now, I can not update the
> passive check services.
>
> So, does someone know how to increase the "Status Information" size ? Which
> define do I need to change ? Which part of the code do I need to change ?
>
> Thanks.
>
> --
> Nicolas COLIN.
>
The problem you'll run into is due to a limitation with FIFOs in
general. The POSIX standard only guarantees an atomic write of 512
bytes max to a FIFO, so writing more data than 512 bytes at a time could
land you in trouble. AFAIK, most OSes bump this level up a bit, but the
max buffer size on a FIFO is often limited to 4K, so your total write
size can't really be above that level.
Length limitations for plugin output will disappear with Nagios 3.x.
There is a new IPC method for handling active host/service checks that
allows for long plugin output (its capped at 4K for safety's sake) and
there is a new external command that will allow passive checks to have
longer (and multiline) output as well. The new PROCESS_EXTERNAL_FILE
command will tell Nagios to read other external commands/passive checks
results from an external (flat) file. Regular files don't have line
length limitations, so this will be a useable workaround.
So, your the problem you have will disappear once Nagios 3 is released,
but it will still be a problem for Nagios 1/2.
Hope that helps.Ethan Galstad,
Nagios Developer
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