I've been looking at trying to use libSMI in the Net-SNMP library, (replacing our current parser) and have run into a problem whereby libSMI crashes out in the middle of parsing HOST-RESOURCES-MIB.
This is in the middle of a large amount of Net-SNMP code, and a noddy test program that does "exactly the same things" works fine :-( The puzzling thing is that the crash is happening within the 'checkObjects' routine, and the noddy program never seems to call this at all.
I realise that I'm probably doing something dumb, and will have to track this down for myself. But I'm somewhat stuck, so am posting here in the hope that someone can point me in the right direction.
The immediate cause of the crash is the block of code headed "Determine the longest common OID prefix of all nodes" (parser-smi.y lines 472-487 of libsmi-0.2.16)
The first candidate considered for 'modulePtr->prefixNodePtr' is the node 'hrMIBAdminInfo' {1,3,6,1,2,1,25,7} - oid length 8. This is presumably picked up from the MODULE-IDENTITY assignment.
Shortly afterwards, the node 'host' is considered as a candidate for prefixNodePtr. This has OID {1,3,6,1,2,1,25} - length 7. This is indeed the appropriate choice for prefixNodePtr.
The block of code in question compares the individual subidentifiers of the current prefixNodePtr (line 479) with the equivalent subids of the new candidate (lines 480/481). In this case, the first seven subids all match, and the eighth subid of 'hrMIBAdminInfo' is compared against the (non-existant) eighth subid of 'host'. At which point the library falls over with a SEGV.
Is this a bug in the library, or my code ?
If it's a problem with the library, why doesn't the noddy program tickle it? (I can post the code of this if that would be helpful).
Is there any advice as to how I can avoid invoking 'checkObjects'? Or is that just applying a sticking plaster and leaving the real problem?
Dave
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