Re: objects marked not-accessible returned by snmpwalk

You don't mention which helper you're using, but if you're using the
table_iterator, is the not-accessible column in
your column_info->details.list?

  Bill


On Mon, Apr 27, 2015 at 6:47 AM, Tim Culhane <[email protected]>
wrote:

> Hi,
>
> I believe it is correct for index objects in a mib to be marked as
> 'not-accessible'.  Hence, when doing a walk of the mib  such oids should be
> skipped over and not returned.  If you specifically try to get the object
> then it should return ' no such object'.
>
> I have a shared object which is loaded by snmpd voa the dlmod directive and
> which has the below function for retrieving column values from a table
> defined in my mib:
>
> Hi Fulko,
>
> Originally in my  shared object I had the following code to retrieve a
> specific column:
>
> ***********************************************************************/
> /*
> * @internal
> * Retrieve the value for a particular column
> */
> NETSNMP_STATIC_INLINE int
> _razorgateSmtpStatusCountersTable_get_column
> (razorgateSmtpStatusCountersTable_rowreq_ctx * rowreq_ctx,
> netsnmp_variable_list * var, int column)
> {
> int             rc = SNMPERR_SUCCESS;
>
>
> DEBUGMSGTL(("internal:razorgateSmtpStatusCountersTable:_mfd_razorgateSmtpSta
> tusCountersTable_get_column", "called for %d\n", column));
>
> netsnmp_assert(NULL != rowreq_ctx);
>
> /*
> * (INDEX)
>
> razorgateSmtpIPAddress(1)/DisplayString/ASN_OCTET_STR/char(char)//L/A/w/e/R/
> d/H
> */
> if (COLUMN_RAZORGATESMTPIPADDRESS == column)
> {
> var->type = ASN_OCTET_STR;
> /*
> * NOTE: val_len is in bytes, razorgateSmtpIPAddress_len might not be (e.g.
> oids)
> */
> if (var->val_len <
> (rowreq_ctx->tbl_idx.razorgateSmtpIPAddress_len *
> sizeof(rowreq_ctx->tbl_idx.razorgateSmtpIPAddress[0]))) {
> var->val.string =
> malloc(rowreq_ctx->tbl_idx.razorgateSmtpIPAddress_len *
> sizeof(rowreq_ctx->tbl_idx.
> razorgateSmtpIPAddress[0]));
> }
> var->val_len =
> rowreq_ctx->tbl_idx.razorgateSmtpIPAddress_len *
> sizeof(rowreq_ctx->tbl_idx.razorgateSmtpIPAddress[0]);
> memcpy(var->val.string, rowreq_ctx->tbl_idx.razorgateSmtpIPAddress,
> var->val_len);
> }
> else if (RAZORGATESMTPSTATUSCOUNTERSTABLE_MIN_COL < column
> && column <= RAZORGATESMTPSTATUSCOUNTERSTABLE_MAX_COL)
> {
> var->val_len = sizeof(long);
> var->type = ASN_INTEGER;
> rc = column_value_get(rowreq_ctx,
> (long *) var->val.string, column);
> }
> else
> {
> snmp_log(LOG_ERR,
> "unknown column %d in _razorgateSmtpStatusCountersTable_get_column\n",
> column);
> }
>
> return rc;
> }
>
> However, if I do a talk of the tableall values are returned, including the
> index field.
>
>
> I then removed the if branch dealing with the IPAddress column, e.g.:
>
> if (COLUMN_RAZORGATESMTPIPADDRESS == column)
> {
> var->type = ASN_OCTET_STR;
> /*
> * NOTE: val_len is in bytes, razorgateSmtpIPAddress_len might not be (e.g.
> oids)
> */
> if (var->val_len <
> (rowreq_ctx->tbl_idx.razorgateSmtpIPAddress_len *
> sizeof(rowreq_ctx->tbl_idx.razorgateSmtpIPAddress[0]))) {
> var->val.string =
> malloc(rowreq_ctx->tbl_idx.razorgateSmtpIPAddress_len *
> sizeof(rowreq_ctx->tbl_idx.
> razorgateSmtpIPAddress[0]));
> }
> var->val_len =
> rowreq_ctx->tbl_idx.razorgateSmtpIPAddress_len *
> sizeof(rowreq_ctx->tbl_idx.razorgateSmtpIPAddress[0]);
> memcpy(var->val.string, rowreq_ctx->tbl_idx.razorgateSmtpIPAddress,
> var->val_len);
> }
>
> But then if I do a walk of the table  I get the below error:
>
>
> snmpwalk -v2c -c public  10.128.19.86:161 -Os
> razorgateSmtpStatusCountersTable
> razorgateSmtpStatusCountersTable = No Such Object available on this agent
> at
> this OID
>
> It seems to be failing on the first oid in the table which is the IPAddress
> oid.
>
> Can anybody tell me how I should handle requests for oids in my shared
> objects when those oids are 'not-accessible'?
>
> Many thanks,
>
> Tim
>
>
>
>
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