I changed netsnmp_register_int() to use sizeof(long) instead of sizeof(int),
and
now sets are working.
Now how do I know I'm not causing any regressions with such a change? :-/
-Joe
On 2/24/12 10:59 AM, Joe Lorenz wrote:
> 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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