Apache SNMP Configuration

I'm glad you and your tutor found the project interesting. Coincidently enough another person on the project is also from Spain, Mario, please meet Daniel. I don't know where in Spain either of you are fromhopefully  not hundreds of kilometers apart. Harrie is much more knowledgeable than I on SNMP programming, unfortunately it seems his mail server has been down some lately.

Here's some information that I hope will get you started. There's some background info and software followed by some pointers specific to this project. I think the first two hurdles are getting to feel comfortable with SMUX development if you're not already and to begin to formulate the MIB itself.

Background Info

SNMP Libraries
 The most widely used snmp library CMU SNMP library. This distribution is available from http://www.net.cmu.edu/projects/snmp/. On that site there are several other SNMP-enable application examples you might pull code from.

SNMP Servers
If you are using Linux then an snmpd (server) should already be included with your distribution, if not you can get a copy from:

http://www.gaertner.de/snmp/
or:
http://www.informatik.fh-wiesbaden.de/dokumentation/Linux/cmu-snmp.html

• this URL contains a user's guide to SNMP server use.

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SNMP-enabling Applications
Here's a useful guide to SNMP enabling applications. It's from the SCO site but cover's the basics:

 http://scohelp.tomcat.ru:457/netguide/smuxN.develop_smux_peers_for_snmp_agents.html

Specific Info
Enough with the background. I've updated the site on Butler.disa.mil/ApacheConfig to include a link to some thoughts on internal data structures for the configuration server. Don't know if the additional info will be useful or confusing :) I will also try and send you an outline of what is called the "broker class". This is a class implemented in C++ and Java which will serve as a wrapper to the SNMP specific code. The idea is to have a core thread handling all the SNMP communication (that's you!) which will communicate with the rest of the server via the broker's methods. The broker will abstract away the details of SNMP communication into a relatively simple interface. Feel free to make whatever changes you think are appropriate to the broker class, we just need to all keep in touch so that everyone understands what the class interface looks like.

On the MIB itself, Harrie suggested the use of tables to store the specific directives. The tables will be dynamic because the Apache directives change some from version to version of the server. I had suggested separating the table into at least three rows- "core", "core-modules", and "modules". I had hoped that this would allow some aspects of the MIB to remain constant across versions. Apache can be built with certain features (modules) enabled or disabled. The table structure is intened to accomodate this because the tables can be switched on and off depending on the compiled configuration of the server. Since the "core-modules" and "core" directives remain relatively constant, the thought was that once this part of the MIB was defined there shouldn't be much work required to keep it up do date. The "modules" section changes as other developers add or modify features of Apache so those authors would each be responsible for coming up with an update to the basic MIB to accomodate their changes. The different columns in the tables would correspond to the various directives.

Hope this isn't too much but is enough info for you to start thinking. As I said, I'll try and get a "broker" out to you this weekend.

Justin