[SNMP4J] ASN.1 data length error

[Young, Alistair]

Hello,
 
I have an agent built upon SNMP4J.  A third-party application is
performing a number of gets and sets on the agent.  It all mostly works
- however, I sometimes see the following error being logged:
 
ASN.1 parse error: Data length > 4 bytes are not supported!
 
I /think/ that this is in response to a 'set' request.
 
I found an old message on this subject, from this list's archives:
http://lists.agentpp.org/pipermail/snmp4j/2007-May/002123.html
 
The response from Frank was "I would guess that the [...] tool does not
correctly BER encode the request."
 
My knowledge of ASN.1 and BER is minimal (basically what I've gleaned
from Wikipedia over the last 30 minutes!).  As I understand it, as well
as specifying the length of a data value, it is also possible to specify
the "length of the length".  This error suggests that whatever data is
being received has a "length of the length" greater than 4 bytes.  As
far as I can tell, this is valid ASN.1/BER.
 
So my question is - is this an invalid SNMP request (i.e. the 'client'
application is wrong), or is this a limitation of SNMP4J (i.e. the agent
application is wrong)?  Or possibly something else (is general
corruption a possibility, or does the fact that the processing has got
this far imply that the basic structure is sound?).
 
Many thanks for any help,
 
 
Alistair.


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