snmpd/agentx return error and multi varbind

Hello,

I have been developing a net-snmp based AgentX application recently
for some enterprise MIBS. While testing the AgentX subagent the
following feature was discovered. It appears not to conform
to the snmp standards. I will explain further below.

Take a simple snmpset command to set SNMPv2-MIB::sysContact.0:

  snmpset -M . -c private -v 1 192.168.248.157 1.3.6.1.2.1.1.4.0 \
  s "Mark Naylor, Schmid Telecom AG, Zurich" 
  iso.3.6.1.2.1.1.4.0 = STRING: "Mark Naylor, Schmid Telecom AG, Zurich"

This works fine. Now add a second deliberately bad OID

  snmpset -M . -c private -v 1 192.168.248.157 1.3.6.1.2.1.1.4.0 s \
  "Mark Naylor, Schmid Telecom AG, Zurich" \
  1.3.6.1.4.211.346.5785 i 1
  Error in packet.
  Reason: (noSuchName) There is no such variable name in this MIB.
  Failed object: iso.3.6.1.4.211.346.5785

An error message comes back, this is correct. Next I made a very simple 
AgentX subagent based on the scalar example 
http://www.net-snmp.org/dev/agent/scalar__int_8c-example.html
If you run it and then repeate the snmpdet command above 
(with the bad OID) you get the same result again.

However, once you add the example scalar OID into the snmpset command,
(so there is communication to the subagent) the bad OID value seems to
be accepted by snmpd!!??

 snmpset -M . -c private -v 1 192.168.248.157 1.3.6.1.2.1.1.4.0 \
 s "Mark Naylor, Schmid Telecom AG, Zurich" \
 1.3.6.1.4.1.8072.2.1.1.0 i 2 \
 1.3.6.1.4.211.346.5785 i 1
 iso.3.6.1.2.1.1.4.0 = STRING: "Mark Naylor, Schmid Telecom AG, Zurich"
 iso.3.6.1.4.1.8072.2.1.1.0 = INTEGER: 2
 iso.3.6.1.4.211.346.5785 = INTEGER: 1

The get always seems to work OK, if a bad OID it given it recognises
this.
There seems to be no problem with snmpget.

What is your opinion on this? I am working with 5.3.0.1, but also
tried 5.3.1 quickly, the result is the same. I compile for
a PPC405EP processor with the ELDK3.0 using the config options

configure --host=powerpc-unknown-linux-gnu --with-endianness=big \
  CC="ppc_4xx-gcc" CPP="ppc_4xx-gcc -E" LD="ppc_4xx-ld"

thanks & regards

  Mark Naylor

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