2009/12/14 Jordi Gutiérrez Hermoso <jord...@gmail.com> > 2009/12/14 Bart Van Assche <bart.vanass...@gmail.com>: > > 2009/12/10 Jordi Gutiérrez Hermoso <jord...@gmail.com> > >> Right now I have in my snmpd.conf a bunch of extend commands of the form > >> > >> extend $oid $name $command --args $oid > >> > >> where $command is a C program we've written that fetches the value > >> associated to $oid. > >> > >> For performance reasons, we would like to replace this with a > >> subagent. > > > > An excellent example of how to extend the Net-SNMP agent can be found on > > > http://net-snmp.sourceforge.net/tutorial/tutorial-5/toolkit/demon/example-demon.c > . > > As I said before, I think I don't understand what I'm doing. If "all" > I want is to create a subagent that calls my already written that > turns OIDs into their values, would this involve a simple change in > the code you showed me? >
The job of looking up and validating OIDs is handled by the Net-SNMP agent itself. For reasons of conformance with the SNMP protocol it is even not desirable to handle this yourself when writing a subagent. Please have a look at the mib2c tool. Once you have written a MIB for the OIDs that you are already using, this tool is able to convert your MIB into template code in which you can easily insert your existing C code. Also, where are the instructions on how to compile that sample code? I > can't figure out the proper libraries to link to. > You can find these instructions, together with the locations where you can download the additional source files nstAgentSubagentObject.h and nstAgentSubagentObject.c, on http://net-snmp.sourceforge.net/tutorial/tutorial-5/toolkit/demon/index.html . Bart.
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