I have created a MIB definition with the following structure:
snmptranslate -Tp -OS MYCOMPANY-APP-MIB::myCompany
+--myCompany(40463)
|
+--test(1)
|
+-- -R-- String testInfo(1)
| Textual Convention: DisplayString
+-- -R-- String testPlacementCountry(2)
| Textual Convention: DisplayString
+-- -R-- Integer32 testCounter(3)
With help from the tutorials I have created myself a MIB module from this MIB
definition and a subagent.
I was trying to create a MIB module for only the root element test which would
also respond to any get requests for its child elements.
Calling snmpget MYCOMPANY-APP-MIB::testInfo did not work, however calling
snmpget MYCOMPANY-APP-MIB::test.0 did work.
user@linux-0lr0:~/projects/snmp-agent> snmpget -c public -v2c localhost
MYCOMPANY-APP-MIB::test.0
MYCOMPANY-APP-MIB::test.0 = STRING: "UNKNOWN "
user@linux-0lr0:~/projects/snmp-agent> snmpget -c public -v2c localhost
MYCOMPANY-APP-MIB::testInfo.0
MYCOMPANY-APP-MIB::testInfo.0 = No Such Instance currently exists at this OID
Could anyone point me in the right direction concerning my MIB module? Do I
need to implement it in a different way and/or am I missing something?
It does not seem like request for any child elements of test are directed to
its handler. Though if I register all 3 scalars with same handler method (put
aside that my OID comparison does not work). Is there any other way to do this
or do I really need to register all scalars this way?
The MIB module code:
#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"
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 };
const oid testCounter_oid[] = { 1,3,6,1,4,1,40463,1,3 };
/** Initializes the test module */
void init_test(void) {
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) {
void* datapointer;
const oid* request_rootoid = (*reginfo).rootoid;
if (*request_ rootoid == testInfo_oid) {
char value[4] = {"test"};
datapointer = &value;
} else if (*request_ rootoid == testPlacementCountry_oid) {
char value[5] = {"test2"};
datapointer = &value;
} else if (*request_ rootoid == testCounter_oid) {
int value = 1234;
datapointer = &value;
} else {
char value[11] = {"UNKNOWN OID"};
datapointer = &value;
}
switch(reqinfo->mode) {
case MODE_GET:
snmp_set_var_typed_value(requests->requestvb,
ASN_OCTET_STR,
datapointer,
sizeof(datapointer));
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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