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
______________________________________________________________________
IMAGO GROUP www.imagoscreens.com
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