Re: rfc: snmptrapd dependencies on agent libs

On Wed, Oct 19, 2005 at 04:08:41PM +0200, Thomas Anders wrote:
> -Coders,
>
> snmptrapd, although living in apps/, has a significant number of
> dependencies on the agent libraries. While the depencies on MIB modules
> (e.g. snmpv3/usmUser and snmpv3/snmpEngine in 5.2+) can be solved by
> suitable #ifdef USING... definitions, the following dependencies still
> exist (5.2+):
>
> - init_agent (from agent/snmp_vars.c)
> - convert_v1pdu_to_v2 (agent/agent_trap.c)
> - run_shell_command (agent/mibgroup/utilities/execute.c)
> - init_perl (agent/snmp_perl.c) if --with-embedded-perl
>
> This has particular drawbacks, e.g. that --disable-agent (documented to
> just leave snmpd out of the build) doesn't work and fails at compile
> time due the dependencies listed above. But even if you could live with
> disabling snmptrapd also, you'll find out that there's no configure
> switch to do so. The closest is --disable-applications which disables
> everything in apps/, so you end up with no binaries at all.
>

> What to do about it?
[ ] reorganize the libraries to take the above out of libnetsnmpagent
and put it somewhere else (either a new common lib for snmpd+snmptrapd
or one of the existing libs)
[ ] build libnetsnmpagent with just the above functions in case of
--disable-agent
[ ] have --disable-agent disable snmpd *and* snmptrapd
[X] <your own suggestions>

I do not think that --disable-agent should disable the subagent libraries, that
should have a separate flag, let's call it --disable-agentlib for now.
This moves the problem to the new flag and for that I think that it would be
reasonable to:
* build the agent library if any of agent, snmptrapd or agentlib are enabled
* always install the shared agent library
* only install the static agent library and the include files if agentlib is
enabled.

That said I do not see any problem with a --disable-snmptrapd flag.

/MF


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