rfc: snmptrapd dependencies on agent libs

-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
[ ] <your own suggestions>

Make your choice.

methinks that we should sort this out before 5.3. Feedback highly
appreciated.


+Thomas

--
Thomas Anders (thomas.anders at blue-cable.de)


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