nsca-2.9 compatability

[Michael Friedrich]

On 11.01.2012 20:16, Andrew Widdersheim wrote:
> I wanted to use Mike Lindsey's new features in nsca-2.9 but found that 
> clients on 2.7.2 were not able to communicate after updating the 
> server. I found this on the Nagios bug tracker:
>
> http://tracker.nagios.org/view.php?id=78
>
> From what I'm reading it's not possible to have a client and server 
> compiled with different MAX_PLUGINOUTPUT_LENGTH. Has this been fixed 
> at all and I'm just not finding it?

i would guess the changed length of char arrays will affect the 
calculated crc for the packet.

the clients calculate a crc based on MAX_PLUGINOUTPUT_LENGTH=512 and add 
that to the sent packet. the server receives a packet, reads the crc32 
and calculates one itsself for having MAX_PLUGINOUTPUT_LENGTH=4096 (to 
be looked at in include/common.h - data_packet_struct)

search the logs for "Dropping packet with invalid CRC32 - possibly due 
to client using wrong password or crypto algorithm?" - anything?

it might also affect en/decryption methods, so watch for such error 
messages as well.


>
>
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-- 
DI (FH) Michael Friedrich

Vienna University Computer Center
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email:     michael.friedrich at univie.ac.at
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Lead Icinga Core Developer
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