Thanks Robert. "Item created successfully. (Artifact 3495075)" On 2/27/12 1:35 PM, Robert Story wrote: > JL> On 2/24/12 10:59 AM, Joe Lorenz wrote: > JL> > $ snmpset -v 2c -c private dut > JL> > NET-SNMP-TUTORIAL-MIB::nstAgentSubagentObject.0 i 5 Error in packet. > JL> > Reason: wrongLength (The set value has an illegal length from what the > JL> > agent expects) > JL> > Failed object: NET-SNMP-TUTORIAL-MIB::nstAgentSubagentObject.0 > JL> > > JL> > This is on an x86_64 environment where sizeof(int) = 4 and > sizeof(long) > JL> > = 8. What I'm noticing is that netsnmp_register_int_instance() calls > JL> > netsnmp_create_watcher_info() with sizeof(int). But I also see > JL> > snmp_set_var_typed_integer() call snmp_set_var_value() with > JL> > sizeof(long), which seems possibly inconsistent. > JL> > > JL> > The snmp_set_var_value() appears to have conditionals for differences > JL> > between size of int and long. So I'm not sure why this doesn't Just > JL> > Work. > > Because when snmp_set_var_value is called to create the internal structure to > hold the incoming value, is saves a length of 8 for ANY integer, regardless of > the actual incoming size. > > JL> > I think I will attempt to change netsnmp_register_int_instance() and > see > JL> > what happens. > > a better idea would be to change the subagent to use > netsnmp_register_long_instance. > > JL> > If anyone has insight on this, I'm all ears. > > It's a bug. The integer instance handler should properly deal with the fact > that the variable structure uses a long, and properly convert it down to a > integer. Can you submit a bug report? > > On Fri, > JL> > 24 Feb 2012 11:32:13 -0500 Joe wrote: > JL> I changed netsnmp_register_int() to use sizeof(long) instead of > JL> sizeof(int), and now sets are working. > JL> > JL> Now how do I know I'm not causing any regressions with such a change? :-/ > > You are. Essentially, you are telling the code it's ok to write up to 8 bytes, > when the pointer passed in for storage is pointing to only 4 bytes of storage. > >
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