Re: question about snmp trap receiver implementation

On Fri, 2005-11-25 at 16:36 +0800, 麻雪蛟(Anders Ma) wrote:   
>         Now I am developping a deamon that could receive snmp trap
> message. I 've learned snmptrapd program, but I couldn't get raw trap
> mesage clearly..  "snmptrapd" use function "snmp_read" do almost
> everything(read packet, parse packet , print packet)

Yes - that's correct.
There's usually no point in repeating the same low-level processing
for each application individually - it makes much more sense to have
it handled by a single library routine.


>  I could'nt have the chance to get raw snmp trap message and parse it
> freely.
>  so who can help me using net-snmp library to get the snmp trap
> message and parse it free?        

If you *really* want to parse the raw incoming message yourself,
then use 'snmp_open_ex' to open the listening session (instead of
'snmp_open'),  and supply your parsing routine as the second
parameter, leaving the other parameters as NULL.

Your parsing routine will need to conform to the same behaviour
as the standard 'snmp_parse()' routine - see "snmplib/snmp_api.c"
for details.

And good luck - there's a *lot* of work involved in parsing an
SNMP packet correctly.  I'm not at all convinced that it's
sensible to reinvent the wheel like this.  But it's your choice.

Dave


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