Re: snmptrapd: Community-String not always passed to handler script

Reading the 5.8 source, it looks like the "traphandle" directive accepts an
undocumented "-F" argument - try

traphandle -F "CommOrSecret=%u" default /appl/snmp/bin/handler.sh

(Obviously you will need to play with the format to get the other
information into it too)

  Bill


On Thu, Jun 4, 2020 at 5:34 AM Markus Reusch <[email protected]>
wrote:

> Hello list,
>
>
>
> sorry to bump this up. Anyone got an idea how to enforce passing the
> community-string to the handler script?
>
>
>
>
>
> Cheers
>
> Markus
>
>
>
>
>
> ---------------------------------------------
>
>
>
> Hello list,
>
>
>
> we wrote a handler script that relies on getting the community-string as
> we the script uses this to generate an event and route it to the correct
> recipients.
>
>
>
> Usually for “real” traps sent by different devices, we can see the
> community-string in the snmptrapd.log. For test traps we send from the
> shell it most times doesn’t show up.
>
>
>
> So with adding something like
>
>
>
> format print Hostname=%B | CommOrSecret=%u | snmpV=%s | TrapDesc="%W"\n |
> Bindings=%v\n
>
>
>
> we can enforce that the community-string is written to the log, but our
> handler does not get this info.
>
> The handler is called with
>
>
>
> traphandle default /appl/snmp/bin/handler.sh
>
>
>
> Maintaining mappings like OIDs to different handler-scripts in
> snmptrapd.conf is no option for us. We do this with a text file in a table
> format which is being looked up by handler script which is much faster and
> easier for us.
>
>
>
> I saw that you can pass arguments to those scripts – is there a kind of
> variable that contains the community-string for example?
>
> Is there any way to ensure that the community-string is passed to the
> handler?
>
>
>
> I could not find anything in the documentation regarding this problem nor
> on the web.
>
>
>
>
>
> Thanks for a hint in advance.
>
>
>
>
>
> Cheers
>
> Markus
>
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