Re: multiple Sub-agents managing the same table

Hi,

After having spent a while on debugging my subagent, I finally find a way to 
resolve it.
I've done a hack in the source code of the function table_helper_handler in 
the file agent/helpers/table.c.

Indeed, this handler is written to handle tables registered from the rootOid 
corresponding to the Oid of the Table. The problem is that with registration 
of a region of MIB, the rootOid corresponds to the index of the table.

Here is my workaround (hardcoded for the moment):

int
table_helper_handler(netsnmp_mib_handler *handler,
                     netsnmp_handler_registration *reginfo,
                     netsnmp_agent_request_info *reqinfo,
                     netsnmp_request_info *requests)
{

    netsnmp_request_info *request;
    netsnmp_table_registration_info *tbl_info;
    int             oid_index_pos;
    unsigned int    oid_column_pos;
    unsigned int    tmp_idx;
    size_t	    tmp_len;
    int             incomplete, out_of_range, cleaned_up = 0;
    int             status = SNMP_ERR_NOERROR, need_processing = 0;
    oid            *tmp_name;
    netsnmp_table_request_info *tbl_req_info;
    netsnmp_variable_list *vb;

    if (!reginfo || !handler)
        return SNMPERR_GENERR;

    // If we the table has been registered with a range_subid
    // the rootOid of the table corresponds to the total Len - 3 (Entry, 
Column and index)
    // To decrement only once the rootoid_len, I hardcode the value 13 for 
my test
    if ( reginfo->range_subid != 0 && reginfo->rootoid_len == 13 )
   {
	reginfo->rootoid_len -= 3;
   }

Now, I want to know how this bug can be corrected in a safe and clean 
manner...

=> at the end of the registration of the table (if a subid is set), set the 
rootoid_len to the correct value ?

What do you think?

Arnaud.

>From: "Arnaud BODENAN" <[email protected]>
>To: [email protected]
>Subject: Re: multiple Sub-agents managing the same table
>Date: Wed, 06 Sep 2006 17:35:52 +0200
>
>OK dave and thanks a lot for all the time you spend for me.
>
>I have a closer look to the function netsnmp_table_data_set_helper_handler
>and try to debug it as it seems that my creation/resgistration now works
>fine.
>
>If somebody has a brilliant idea about this problem, he's welcome!
>
>Arnaud.
>
> >From: "Dave Shield" <[email protected]>
> >To: "Arnaud BODENAN" <[email protected]>
> >CC: [email protected]
> >Subject: Re: multiple Sub-agents managing the same table
> >Date: Wed, 6 Sep 2006 16:00:51 +0100
> >
> >On 06/09/06, Arnaud BODENAN <[email protected]> wrote:
> > > I follow your advice and do a walk on nsModuletable. So, With net-snmp
> > > v5.3.1, I launch twice the same application, and I get the following
> >result
> > > with an snmpwalk on nsModuleTable:
> >
> >      [snip]
> >
> >I haven't the time to follow your travails in detail at the moment,
> >but that certainly looks as if the two rows are at least being
> >registered correctly.   So if the walk doesn't deliver the right
> >results, it's probably due to problems within the dataset helper
> >handler (i.e. when processing a request), rather than anything in the
> >registration stage.
> >
> >Not that this knowledge gets you any further forward, but it's always
> >useful to know where you should be looking!
> >
> >Dave
> >
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Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
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