Cross-referencing MIB module with IF-MIB::ifIndex and IF-MIB::ifDescr

Greetings!

I'm implementing a MIB module, and I'm stuck.  Right now, I'm trying to 
get my table working.  Here's a snippet from the MIB:

    SomeInterfaceEntry ::=
       SEQUENCE {
          someIfIndex      <--  this will correspond to IF-MIB::ifIndex
             InterfaceIndex,
          someIfName
             SnmpAdminString,
          someIfStatus
             TruthValue,
          someValue
             Unsigned32,

The manager should be able to run a query such as

snmpget ... ... someValue.1

In my handler, I'll see the requested index was 1, I'll lookup that 
index IF-MIB::ifIndex, grab the corresponding IF-MIB::ifDescr, and 
continue handling the request.

In other words, the external data I'm querying is based on the interface 
name (ie, "eth0"), but my table has a numeric index tied to IF-MIB::ifIndex.

So the question is: from within my MIB code, how can I access the 
interfaces group?  Surely I could do some popen call and execute

"snmpbulkget ... ... ifIndex ifDescr"

and then parse the results, but that's ugly and I figure there must be a 
way to grab the IF-MIB data programmatically.


FYI: in case it matters, my MIB module is running as an AgentX subprocess.

Many thanks!!

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