Sending GENERR back in GET Request

I'm writing a simple AgentX sub-agent to handle two scalars called defaultBackGroundColor and dmsColorScheme. When accesing defaultBackGroundColor I have to return its value or a genErr depending on the value of dmsColorScheme. I'm forced by specification to use SNMP v1.
 
Here is the code I use to register both scalars
 
reg = netsnmp_create_handler_registration ( "defaultBackGroundColor", handle_defaultBackGroundColor,
                                            defaultBackGroundColor_oid, OID_LENGTH(defaultBackGroundColor_oid),
                                            HANDLER_CAN_RWRITE);
netsnmp_register_scalar( reg );
 
reg  = netsnmp_create_handler_registration ( "dmsColorScheme", NULL,
                                             dmsColorScheme_oid, OID_LENGTH(dmsColorScheme_oid),
                                             HANDLER_CAN_RONLY);
winfo = netsnmp_create_watcher_info ( &dmsColorScheme, sizeof(long),
                                      ASN_INTEGER, WATCHER_FIXED_SIZE);
netsnmp_register_watched_scalar ( reg, winfo );
 
And the handler for defaultBackGroundColor
 
int handle_defaultBackgroundColor ( netsnmp_mib_handler          *handler,
                                    netsnmp_handler_registration *reginfo,
                                    netsnmp_agent_request_info   *reqinfo,
                                    netsnmp_request_info         *requests )
{
    int ret;
 
    switch ( reqinfo->mode )
    {
        case MODE_GET:
            
            if ( dmsColorScheme != CS_colorClassic )
                netsnmp_set_request_error ( reqinfo, requests, SNMP_ERR_GENERR );
            else
                snmp_set_var_typed_value ( requests->requestvb, ASN_INTEGER,
                                           (u_char *) &defaultBackgroundColor, sizeof(long) ); 
            break;
 
        case MODE_SET_RESERVE1:
            if ( dmsColorScheme != CS_colorClassic )
                netsnmp_set_request_error ( reqinfo, requests, SNMP_ERR_GENERR );
            else
            {    
                if ( ( ret = netsnmp_check_vb_int_range ( requests->requestvb, DMSCLASSICCOLOR_MIN, DMSCLASSICCOLOR_MAX ) ) )
                {
                    DEBUGMSGTL ( ( "ntcip", "defaultBackgroundColor Bad value\n" ) );
                    netsnmp_set_request_error ( reqinfo, requests, ret );
                }
            }
            break;
 
        case MODE_ACTION:
            defaultBackgroundColor = *requests->requestvb->val.integer;
            break;
        case MODE_SET_RESERVE2:
        case MODE_SET_COMMIT:
        case MODE_SET_UNDO
            break;
        
        default:
            return SNMP_ERR_GENERR;

    }
 
    return SNMP_ERR_NOERROR;
}
                                                  
The subagent is working fine except for a small problem. If I set dmsColorScheme to a value that forces dmsBackGroundColor to return a GENERR error, in a SET request I get a GENERR error but, in a GET request, I get a NOSUCHNAME error. I'm using snmpset and snmpget to make the tests.
 
The funny thing is that if I issue the same commands using SNMP v2c I get GENERR on both GET and SET requests, and if I run my agent as a master agent I get GENERR also on both requests even using SNMP v1.
 
The net-snmp version is 5.4.1 and the OS is an Ubuntu Jaunty
 
any ideas on what am I missing here?
 
Jordi López

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IMAGO GROUP www.imagoscreens.com
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