[SNMP4J] Re: BufferOverflowException while encoding a GETNEXT PDU

[Frank Fock]

Hi Tejo,

Can you send me the OIDs you use in your GETNEXT? This
will facilitate reproducing the problem.

BTW, the OID length in SNMP is limited to 128 sub-identifiers.

Thanks in advance,
Frank

Tejo Vamsi wrote:

>Hi Frank,
>
>Yes I am using v1.5 only.
>
>Regards,
>Tejo
>
>--- Frank Fock <fock at agentpp.com> wrote:
>  
>
>>Hi Tejo,
>>
>>Are you using v1.5 yet?
>>
>>Thanks,
>>Frank
>>
>>Tejo Vamsi wrote:
>>
>>    
>>
>>>Hi Frank, All,
>>>
>>>I observed a very uncommon exception when SNMP4J
>>>      
>>>
>>was
>>    
>>
>>>trying to encode a big 
>>>(contains 16 varbinds) GETNEXT PDU. The code
>>>      
>>>
>>actually
>>    
>>
>>>failed, when it was
>>>trying to encode the OID of the last varbind,
>>>      
>>>
>>because
>>    
>>
>>>it tried to write beyond
>>>the allocated buffer size. I suppose, this
>>>      
>>>
>>situation
>>    
>>
>>>of exceeding the buffer size
>>>should not occur as the code pre-computes the
>>>      
>>>
>>buffer
>>    
>>
>>>size needed for this encoded
>>>PDU and passes that stream to the encode method. I
>>>      
>>>
>>am
>>    
>>
>>>not really sure what is
>>>causing the problem. I did not observe this
>>>      
>>>
>>scenario
>>    
>>
>>>in case of other 
>>>GETNEXT PDUs. Any specific areas where I need to
>>>investigate to fix the problem
>>>? By the way is there any limit on the OID length ?
>>>
>>>Following is the stack trace I got:
>>>      
>>>
>>-------------------------------------------------------
>>    
>>
>>>	HeapByteBuffer(Buffer).nextPutIndex() line: 419
>>>	HeapByteBuffer.put(byte) line: 145
>>>	BEROutputStream.write(int) line: 65
>>>	BER.encodeOID(OutputStream, byte, int[]) line: 429
>>>	OID.encodeBER(OutputStream) line: 205
>>>	VariableBinding.encodeBER(OutputStream) line: 176
>>>	ScopedPDU(PDU).encodeBER(OutputStream) line: 465
>>>	ScopedPDU.encodeBER(OutputStream) line: 127
>>>	MPv3.prepareOutgoingMessage(Address, int, int,
>>>      
>>>
>>int,
>>    
>>
>>>byte[], int, PDU, boolean, PduHandle, Address,
>>>BEROutputStream) line: 601
>>>	MessageDispatcherImpl.sendPdu(TransportMapping,
>>>Address, int, int, byte[], int, PDU, boolean) line:
>>>375
>>>	Snmp.sendMessage(PDU, Target, TransportMapping)
>>>      
>>>
>>line:
>>    
>>
>>>885
>>>	Snmp.send(PDU, Target, TransportMapping, Object,
>>>ResponseListener) line: 783
>>>	Snmp.send(PDU, Target, Object, ResponseListener)
>>>line: 771
>>>      
>>>
>>-------------------------------------------------------
>>    
>>
>>>Thanks for your time.
>>>
>>>Regards,
>>>Tejo
>>>
>>>__________________________________________________
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>>>      
>>>
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>>    
>>
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>>> 
>>>
>>>      
>>>
>>
>>    
>>
>
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>  
>