Hi,
I am using Net-SNMP version 5.7.1.pre2, having built it using Visual
Studio 2008 with support for the agentx module and installed the Perl
modules that are bundled with it.
I have configured the agent to run as an AgentX master agent and I have a
perl module that registers a sub-agent handler, MyHandler, for OID
1.3.6.1.4.1.2257.11.1.1.1 (ssaApplication).
The call-back handler, MyHandler, is called correctly for Get, Set and
GetNext requests issued for OIDs in the sub-tree below
1.3.6.1.4.1.2257.11.1.1.1.
However, when I issue an SNMP Walk command at OID 1.3.6.1.4.1.2257.11.1.1
(ssaGenericMIB), I get what I believe to be unexpected behaviour from the
master agent.
1. The agent receives a GETNEXT message for OID, 1.3.6.1.4.1.2257.11.1.1.
I believe this is correct.
2. The agent invokes MyHandler, passing it OID 1.3.6.1.4.1.2257.11.1.1.1.
I believe this is also correct.
3. The mode passed to MyHandler is 'Get'. This is incorrect as a
GetRequest cannot be invoked without an instance id.
This doesn't make any sense. The call-back handler should be invoked with
a mode indicating 'GetNext' and the OID 1.3.6.1.4.1.2257.11.1.1.1. Why is
the mode being changed from 'GetNext' to 'Get'?
At the very least the agent should not invoke the call-back handler with
mode 'Get' on an object that is not an instance. This is not allowed in
SNMP.
Has anyone else seen this kind of behaviour?
The output from the agent is included below. The OID of ssaNetwork (seen
in the output below) is 1.3.6.1.4.1.2257.11.1.1.2.
C:\net-snmp\bin>snmpd.exe -V -f -Lo -Dagentx udp:8161
registered debug token agentx, 1
agentx_register_app_config_handler: registering .conf token for
"agentxsocket"
agentx_register_app_config_handler: registering .conf token for
"agentxperms"
agentx_register_app_config_handler: registering .conf token for
"agentxRetries"
agentx_register_app_config_handler: registering .conf token for
"agentxTimeout"
Turning on AgentX master support.
agentx/config: port spec: tcp:localhost:30000
agentx/master: initializing...
agentx/master: initializing... DONE
NET-SNMP version 5.7.1.pre2
agentx/master: transport connect on session 00AF8508
agentx/master: handle pdu (req=0x7ad0,trans=0x0,sess=0x0)
agentx/master: open 00AF8508
agentx/master: opened 00B092D8 = 5 with flags = a0
agentx/master: send response, stat 0 (req=0x7ad0,trans=0x0,sess=0x0)
agentx_build: packet built okay
agentx/master: handle pdu (req=0x7ad1,trans=0x0,sess=0x5)
agentx/master: in register_agentx_list
agentx/master: registered ok
agentx/master: send response, stat 0 (req=0x7ad1,trans=0x0,sess=0x5)
agentx_build: packet built okay
agentx/master: handle pdu (req=0x7ad2,trans=0x0,sess=0x5)
agentx/master: in register_agentx_list
agentx/master: registered ok
agentx/master: send response, stat 0 (req=0x7ad2,trans=0x0,sess=0x5)
agentx_build: packet built okay
Received SNMP packet(s) from UDP: [10.50.80.218]:3185->[0.0.0.0]:0
GETNEXT message
-- SSA-GENERIC-MIB::ssaGenericMIB
agentx/master: agentx master handler starting, mode = 0xa1
agentx/master: request for variable (SSA-GENERIC-MIB::ssaGenericMIB)
agentx/master: inexact request preceeding region
(SSA-APPLICATION-MIB::ssaApplication)
agentx/master: INCLUSIVE varbind SSA-APPLICATION-MIB::ssaApplication
scoped to SSA-NETWORK-MIB::ssaNetwork
agentx/master: sending pdu (req=0x2,trans=0x1,sess=0x5)
agentx_build: packet built okay
agentx/master: transport disconnect on session 00AF8508
agentx/master: close 00AF8508, -1
agentx/master: agentx master handler starting, mode = 0xa1
agentx/master: request for variable (SSA-GENERIC-MIB::ssaGenericMIB)
agentx/master: inexact request preceeding region
(SSA-NETWORK-MIB::ssaNetwork)
agentx/master: INCLUSIVE varbind SSA-NETWORK-MIB::ssaNetwork scoped to
SSA-FILE-TRANSFER-MIB::ssaFileTransfer
agentx/master: sending pdu (req=0x3,trans=0x1,sess=0x5)
agentx_build: packet built okay
agentx/master: timeout on session 00AF8508 req=0x2
agentx/master: NULL sess_pointer??
regards
Ramon
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