I'm working through the NET-SNMP-TUTORIAL-MIB example using
nstAgentSubagentObject.c and example-demon.c running as a subagent. I'm using
Net-SNMP 5.7.1.
I have success on reads, but writes give a "wrongLength" error:
$ snmpget -v 2c -c private dut NET-SNMP-TUTORIAL-MIB::nstAgentSubagentObject.0
NET-SNMP-TUTORIAL-MIB::nstAgentSubagentObject.0 = INTEGER: 2
$ snmpset -v 2c -c private dut NET-SNMP-TUTORIAL-MIB::nstAgentSubagentObject.0
i
5
Error in packet.
Reason: wrongLength (The set value has an illegal length from what the agent
expects)
Failed object: NET-SNMP-TUTORIAL-MIB::nstAgentSubagentObject.0
This is on an x86_64 environment where sizeof(int) = 4 and sizeof(long) = 8.
What I'm noticing is that netsnmp_register_int_instance() calls
netsnmp_create_watcher_info() with sizeof(int). But I also see
snmp_set_var_typed_integer() call snmp_set_var_value() with sizeof(long), which
seems possibly inconsistent.
The snmp_set_var_value() appears to have conditionals for differences between
size of int and long. So I'm not sure why this doesn't Just Work. I think I
will
attempt to change netsnmp_register_int_instance() and see what happens.
If anyone has insight on this, I'm all ears.
Many thanks,
-Joe
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