Thank you for your quick response.
I have a NET-SNMP agent with a table registered at OID .1.3.6.1.3.1.1.1.1.5 and
the table entry defined at .1.3.6.1.3.1.1.1.1.5.1
When I perform an snmpgetnext .1.3.6.1.3.1.1.1.1.5.1 .1.3.6.1.3.1.1.1.1.5.2,
the first request to netsnmp_extract_table_info(request) goes well but the
second returns NULL and then the agent crashes at the if statement.
I have done the next modification to workaround this problem:
table_info = netsnmp_extract_table_info(request);
if(table_info==NULL){
snmp_log(LOG_ERR,"returned NULL table_info.\n");
request->processed = 1;
}else{
if (table_info->colnum < tbl_info->min_column - 1) {
/* XXX: optimize better than this */
/* for now, just increase to colnum-1 */
/* we need to jump to the lowest result of the min_column
and take it, comparing to nothing from the request */
table_info->colnum = tbl_info->min_column - 1;
} else if (table_info->colnum > tbl_info->max_column) {
request->processed = 1;
}
}
Because of this I was wondering if it should be controlled whether table_info
is NULL or if there is any other hidden problem to be solved.
Thank you for any advice or comment,
David
On Tue, 2006-02-21 at 12:14 +0100, Fernández Piñas, David wrote:
> I have seen at table_iterator.c the next lines of code in function
> netsnmp_table_iterator_helper_handler:
>
> table_info = netsnmp_extract_table_info(request);
> if (table_info->colnum < tbl_info->min_column - 1) {
>
> Should it be checked whether table_info is NULL before executing if
> statement?
It would probably be sensible, yes - even if only to log an error.
DF> Something like that: snmp_log(LOG_ERR,"NULL table_info.\n");
> Should table_info ever be NULL?
No.
'table_info' holds the information about the basic structure of the table, as
provided when the table was first registered.
If this is NULL, then the table processing will not work.
Dave
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