I could not find this in the bug list. Apologies if I have missed it. When a subagent sends a message (e.g. registering a MIB portion) to the AgentX master, it looks for its response by checking the PacketID of all incoming packets. If the PacketID matches, it assumes that it will be the response to its own outgoing packet. While in most cases this is true, it is possible for the master to be also sending its own message (e.g. an SNMP get for an already registered part of the MIB) and to allocate the same PacketID value. (Aside: the code stores the PacketID in reqid)
When the subagent processes the response (in
agent/mibgroup/agentx/client.c::agentx_synch_input()), it does check to
see if the packet is a response...
state->waiting = 0;
if (op == NETSNMP_CALLBACK_OP_RECEIVED_MESSAGE) {
if (pdu->command == AGENTX_MSG_RESPONSE) {
However, if the pdu command is anything other than a response, the
incoming message is dropped. As state->waiting has been set to zero,
the subagent will also give up on its own packet (I am not sure what
value state->status will have in this case).
I am not sure what knock-on effects this will have. I don't know if it
is related to
http://sourceforge.net/tracker/index.php?func=detail&aid=1097029&group_id=12694&atid=112694
If pdu-> command is anything else, the code (in
agent/mibgroup/agentx/client.c::agentx_synch_input()) should call
handle_agentx_packet() and not set state->waiting = 0; It would also be
nice if snmplib/snmp_client.c::snmp_synch_response_cb() initialised
state->status to a known value.
I am looking at version 5.4.2.1 of the source code.
Maurice Goodfellow
Senior Design Engineer
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