Hi Dave,
I've found the source of the bug. As all bug, it was a silly mistake.
Initially, I've set the RowIndex on Table2 to OctetString while studying the
data_set.c source code. I've decided to change it to Integer32 which is more
practical.
by DEBUGMSGTL, the code ends while executing
....
switch (table_info->colnum){
case
}
--- On Tue, 10/19/10, Dave Shield <[email protected]> wrote:
From: Dave Shield <[email protected]>
Subject: Re: Understanding snmpwalk
To: "Leo Lin" <[email protected]>
Cc: "Net-snmp-users" <[email protected]>
Date: Tuesday, October 19, 2010, 8:53 AM
On 19 October 2010 16:42, Leo Lin <[email protected]> wrote:
> you are correct, table.c is not the source of the problem.
> However, I don't understand why snmpd hangs on AlarmDescription.2 on conf.c
It doesn't.
The client application (snmpwalk or snmpgetnext) issues a GETNEXT request
on alarmDescription.2. The agent is therefore being asked to return the
*NEXT* value that it knows about - i.e. whatever comes after alarmDescription.2
There isn't anything else left inside table1, so control then passes to the next
module within the OID tree. In this case, it's table2.
table2 is then asked for the first entry that it knows about.
Something about this request then hangs.
You'd see exactly the same effect if you asked for
GETNEXT table1Entry.column999
or
GETNEXT table1Table.2
or
GETNEXT table1Table.999
or
GETNEXT table2Table
or
GETNEXT table2Entry
All of these are asking for the next instance after the specified OID,
i.e. the first column entry from table2.
Remember, the SNMP protocol doesn't know (or care) about the boundaries
between different groups, tables, columns, etc. It just works with a sequence
of OIDs, which can be ordered, but are otherwise all equivalent.
Dave
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