Putting lord of the ring aside, I need to create an SNMP agentX with only one
handler for all OIDs. I need to implement it this way to dynamically handle an
MIB definition.
I used the mib2c command to create a mib module from my example MIB definition
wich contain 2 scalars. I used this to get a starting point for the code (all
my OIDs are scalar, and the total number of OIDs will be in the number of
thousands). The agent I wish to create will not have access to the MIB
definition before it starts up and makes contact with the device it is going to
manage (this because the MIB definition can change and vary from system to
system).
This is my starting point of the generated code. I must parse the incoming OID
request my self and then extract the its value from the device which will then
be forwarded to the manager(requester). Can anyone point me in the right
direction, some tutorials/examples about this would be great.
/*
* Note: this file originally auto-generated by mib2c using
* $
*/
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/agent/net-snmp-agent-includes.h>
#include "test.h"
/** Initializes the test module */
void init_test(void) {
const oid test_oid[] = { 1,3,6,1,4,1,40463,1 };
const oid testInfo_oid[] = { 1,3,6,1,4,1,40463,1,1 };
const oid testPlacementCountry_oid[] = { 1,3,6,1,4,1,40463,1,2 };
DEBUGMSGTL(("test", "Initializing\n"));
netsnmp_register_scalar(
netsnmp_create_handler_registration("test", handle_test, test_oid,
OID_LENGTH(test_oid), HANDLER_CAN_RONLY ));
}
int handle_test(netsnmp_mib_handler *handler, netsnmp_handler_registration
*reginfo, netsnmp_agent_request_info *reqinfo, netsnmp_request_info *requests)
{
/* We are never called for a GETNEXT if it's registered as a
"instance", as it's "magically" handled for us. */
/* a instance handler also only hands us one request at a time, so
we don't need to loop over a list of requests; we'll only get one. */
const OID request_oid = ...
if (request_oid == testInfo_oid) {
*thisWillBeMyPointerToTheData = "test";
} else if (request_oid == testPlacementCountry_oid) {
*thisWillBeMyPointerToTheData = "test2";
}
switch(reqinfo->mode) {
case MODE_GET:
snmp_set_var_typed_value(requests->requestvb, ASN_OCTET_STR,
thisWillBeMyPointerToTheData, sizeof(thisWillBeMyPointerToTheData));
break;
default:
/* we should never get here, so this is a really bad error */
snmp_log(LOG_ERR, "unknown mode (%d) in handle_test\n", reqinfo->mode );
return SNMP_ERR_GENERR;
}
return SNMP_ERR_NOERROR;
}
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