Re: SNMP subagent in C + exec_command or similar

>>>>> On Tue, 4 May 2010 12:22:50 +0200, Hársszegi Tibor <[email protected]> said:

HT> I need to create a subagent within C.
HT> Majority of the code executes 'scripts' like

Well, that architecture will be hard to make work quickly.  At a minimum
I'd suggest using a caching mechanism so you don't fire the script off
per ever call.

HT> I know that for this only I would NOT need .C agents at all,
HT> snmpd.conf + extend would be just fine. However it is also needed to
HT> trace whenever someone changes a given OID so that a trap event can
HT> ge sent to a remote host.

(in theory you could also accomplish this by inserting a handler
somewhere in between the main agent and the end-script execution, but
that's probably more advanced :-)

The problem with forking is that you'll end up duplicating the entire
agent memory, which is expensive.

HT> I have also tried to use the exec_command() within util_funcs, but I
HT> can't even use that, as "struct extensible" is not being defined in
HT> any of the publicly available headers.

You can go steal it from the agent/mibgroup directory.  It's actually a
header we've wanted to install for a long time but haven't.  The
function is defined in the libnetsnmpmibs library when you do your linking.

-- 
Wes Hardaker
Cobham Analytic Solutions

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