This is something like a "handler" or "code object" for your MIB.
You should also write a subagent that initializes and uses this code.
The subagent is the one that loads the code you have written and
manipulates it.
You can see this tutorial:
http://www.net-snmp.org/wiki/index.php/TUT:Writing_a_Subagent
It has some example files that might help you:
- the nst*.c and nst*.h are auto-generated
- while the example-demon is the sub-agent that initializes and uses the
auto-generated MIB code.
I guess what you need is to implement an "example-demon" of your own and
start it either by itself (by calling sudo ./example-demon)
or deploy it into your main snmpd daemon.
Before creating and running a subagent (like that example-demon) you
will be able to call only snmptranslate to your new MIB,
but won't be able to read or write its actual values. Thus, the "No Such
Object available on this agent at this OID"...
On 10/17/2012 01:02 PM, Jatin Bodarya wrote:
Below is my mib2c generated code. I am compiling it as subagent... but
it is not showing any kind of values. What should be my next step to
implement it ? from where can I get data? Please help me to implement it.
snmpwalk -c public -v 2c localhost 1.3.6.1.4.1.21068
POOL-MIB::elite = No Such Object available on this agent at this OID
Thansks in advance.
Code :
/*
* 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 "pool.h"
/** Initializes the pool module */
void
init_pool(void)
{
/* here we initialize all the tables we're planning on supporting */
initialize_table_poolTable();
}
//Determine the first/last column names
/** Initialize the poolTable table by defining its contents and how
it's structured */
void
initialize_table_poolTable(void)
{
const oid poolTable_oid[] = {1,3,6,1,4,1,21068,4,2};
const size_t poolTable_oid_len = OID_LENGTH(poolTable_oid);
netsnmp_handler_registration *reg;
netsnmp_iterator_info *iinfo;
netsnmp_table_registration_info *table_info;
DEBUGMSGTL(("pool:init", "initializing table poolTable\n"));
reg = netsnmp_create_handler_registration(
"poolTable", poolTable_handler,
poolTable_oid, poolTable_oid_len,
HANDLER_CAN_RONLY
);
table_info = SNMP_MALLOC_TYPEDEF( netsnmp_table_registration_info );
netsnmp_table_helper_add_indexes(table_info,
ASN_INTEGER, /* index: ifIndex */
0);
table_info->min_column = 1;
table_info->max_column = COLUMN_POOLINOCTETS;
iinfo = SNMP_MALLOC_TYPEDEF( netsnmp_iterator_info );
iinfo->get_first_data_point = poolTable_get_first_data_point;
iinfo->get_next_data_point = poolTable_get_next_data_point;
iinfo->table_reginfo = table_info;
netsnmp_register_table_iterator( reg, iinfo );
/* Initialise the contents of the table here */
}
/* Typical data structure for a row entry */
struct poolTable_entry {
/* Index values */
long ifIndex;
/* Column values */
u_long poolInOctets;
/* Illustrate using a simple linked list */
int valid;
struct poolTable_entry *next;
};
struct poolTable_entry *poolTable_head;
/* create a new row in the (unsorted) table */
struct poolTable_entry *
poolTable_createEntry(
long ifIndex
) {
struct poolTable_entry *entry;
entry = SNMP_MALLOC_TYPEDEF(struct poolTable_entry);
if (!entry)
return NULL;
entry->ifIndex = ifIndex;
entry->next = poolTable_head;
poolTable_head = entry;
return entry;
}
/* remove a row from the table */
void
poolTable_removeEntry( struct poolTable_entry *entry ) {
struct poolTable_entry *ptr, *prev;
if (!entry)
return; /* Nothing to remove */
for ( ptr = poolTable_head, prev = NULL;
ptr != NULL;
prev = ptr, ptr = ptr->next ) {
if ( ptr == entry )
break;
}
if ( !ptr )
return; /* Can't find it */
if ( prev == NULL )
poolTable_head = ptr->next;
else
prev->next = ptr->next;
SNMP_FREE( entry ); /* XXX - release any other internal resources */
}
/* Example iterator hook routines - using 'get_next' to do most of the
work */
netsnmp_variable_list *
poolTable_get_first_data_point(void **my_loop_context,
void **my_data_context,
netsnmp_variable_list *put_index_data,
netsnmp_iterator_info *mydata)
{
*my_loop_context = poolTable_head;
return poolTable_get_next_data_point(my_loop_context, my_data_context,
put_index_data, mydata );
}
netsnmp_variable_list *
poolTable_get_next_data_point(void **my_loop_context,
void **my_data_context,
netsnmp_variable_list *put_index_data,
netsnmp_iterator_info *mydata)
{
struct poolTable_entry *entry = (struct poolTable_entry
*)*my_loop_context;
netsnmp_variable_list *idx = put_index_data;
if ( entry ) {
snmp_set_var_typed_integer( idx, ASN_INTEGER, entry->ifIndex );
idx = idx->next_variable;
*my_data_context = (void *)entry;
*my_loop_context = (void *)entry->next;
return put_index_data;
} else {
return NULL;
}
}
/** handles requests for the poolTable table */
int
poolTable_handler(
netsnmp_mib_handler *handler,
netsnmp_handler_registration *reginfo,
netsnmp_agent_request_info *reqinfo,
netsnmp_request_info *requests) {
netsnmp_request_info *request;
netsnmp_table_request_info *table_info;
struct poolTable_entry *table_entry;
DEBUGMSGTL(("pool:handler", "Processing request (%d)\n",
reqinfo->mode));
switch (reqinfo->mode) {
/*
* Read-support (also covers GetNext requests)
*/
case MODE_GET:
for (request=requests; request; request=request->next) {
table_entry = (struct poolTable_entry *)
netsnmp_extract_iterator_context(request);
table_info = netsnmp_extract_table_info( request);
switch (table_info->colnum) {
case COLUMN_POOLINOCTETS:
if ( !table_entry ) {
netsnmp_set_request_error(reqinfo, request,
SNMP_NOSUCHINSTANCE);
continue;
}
snmp_set_var_typed_integer( request->requestvb,
ASN_COUNTER,
table_entry->poolInOctets);
break;
default:
netsnmp_set_request_error(reqinfo, request,
SNMP_NOSUCHOBJECT);
break;
}
}
break;
}
return SNMP_ERR_NOERROR;
}
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--
*/Katia Sarsempagieva/*
/ Research Assistant
Media Network Laboratory
Institute of Information and Telecommunications
NCSR Demokritos
/
------------------------------------------------------------------------------
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