RE: Extending an Agent

Dave - I tried to use the mib2c config file you suggested.  It generates a few
bugs in the c file that are pretty easy to see, others are a little more 
confusing.

For example, it generates the following function definition:

/*
 * create a new row in the table 
 */
struct jtrsMdlNeighborNodeTable_entry *
jtrsMdlNeighborNodeTable_createEntry(netsnmp_container * container,,
                                     long jtrsMdlChannelId,
                                     long jtrsNeighborNodeId)

Note the two commas in the argument list.

Inside the function, it generates the lines:

    entry->oid_index.len = XXX;
    entry->oid_index.oids = YYY;

Any ideas what XXX and YYY are supposed to be?  .len is supposed to be a u_short 
and YYY is a u_long *.


It also generates this block with a reference to a function:
netsnmp_container_table_extract()

    case MODE_SET_UNDO:
        for (request = requests; request; request = request->next) {
            container = netsnmp_container_table_extract(request);
            table_entry = (struct jtrsMdlNeighborNodeTable_entry *)
                netsnmp_container_table_extract_context(request);
            table_info = netsnmp_extract_table_info(request);

I can't find this defined, but I did find:
netsnmp_container_table_extract_context() - Is this what it was supposed
to be calling?  It doesn't seem to matter because *container is defined locally
in this function and isn't used after the above call.

In the initialize_table_jtrsMdlNeighborNodeTable function, I see a comment that 
says:
// Initialise the contents of the table here

I'm assuming I'll add my code here to set initial values for the table members.  It's 
a little unclear about how to do this.  Is the table data stored in the 
netsnmp_table_registration_info *table_info struct ptr?  I looked but
didn't see any example of how to do this.

Thanks for the help,
Mark







Thanks,
Mark

Mark Riehl
Agile Communications, Inc.
Email: [email protected]
Office: (732) 528-9305
Fax: (732) 528-9308
Cell: (732) 996-7630



-----Original Message-----
From: [email protected] on behalf of Dave Shield
Sent: Thu 5/10/2007 11:04 AM
To: Mark Riehl
Cc: [email protected]
Subject: Re: Extending an Agent
 
On 09/05/07, Mark Riehl <[email protected]> wrote:
>  Is the MfD the best config to use for this?

That probably depends who you ask.

I dislike the MfD framework myself, but I try not to let my personal
opinions colour the advice I give on the list.  Robert has put a lot
of work into this framework, and although I disagree with many of
the design decisions (not to mention the amount of code generated!),
there's a lot of good stuff there.

  My personal preference for implementing MIBs tends to be the
mib2c.container.conf framework.

But if all you want is a simple test module, and aren't really interested
in the internals, then you might like to take a look at the 'create-dataset'
template.
   This handles all of the table data internally, so you should be able
to populate and query it via SNMP queries, with minimal coding needed.
Just have a look through the init routine, and make sure the appropriate
flags are set to allow row creation, etc.

I wouldn't tend to use this for a "real" MIB module, monitoring some
underlying subsystem.  But it sounds ideal for your needs here.

Dave

-------------------------------------------------------------------------
This SF.net email is sponsored by DB2 Express
Download DB2 Express C - the FREE version of DB2 express and take
control of your XML. No limits. Just data. Click to get it now.
http://sourceforge.net/powerbar/db2/

_______________________________________________
Net-snmp-users mailing list
[email protected]
Please see the following page to unsubscribe or change other options:
https://lists.sourceforge.net/lists/listinfo/net-snmp-users