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. ------------------------------------------------------------------------------ Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2 _______________________________________________ Net-snmp-coders mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/net-snmp-coders
