Re: Can we extract (agent)IP address for which get/set request is generated in table handler

Fulko Hew wrote:
>
> On Tue, May 12, 2009 at 2:23 AM, parveen yadav 
> <[email protected] <mailto:[email protected]>> wrote:
>
>     Fulko Hew wrote:
>>     On Sat, May 9, 2009 at 5:18 AM, parveen yadav
>>     <[email protected] <mailto:[email protected]>>
>>     wrote:
>>
>>         Wes Hardaker wrote:
>>>>>>>>         On Tue, 05 May 2009 14:27:53 +0530, parveen yadav <[email protected]> <mailto:[email protected]> said:
>>>>>>>>                     
>>>         py> I am trying to extract agent IP address for which get/set request is 
>>>         py> generated by snmpget in get_first_data_point,get_next_data_point and 
>>>         py> table handler. I am table iterator for my table.
>>>
>>>         No, you can't.  Though technically possible some of the time it's
>>>         generally not something that you should be doing.  SNMP wasn't designed
>>>         to work that way, and although it's possible it breaks under some
>>>         conditions.  EG, if you ever want to run your code as an AgentX subagent
>>>         that information isn't available at all.
>>>           
>>         But i think we can extract request ip in case net-snmp is
>>         working as main agent and we do not need to handle AgentX.
>>         But it is hard to find the storage location. I have tried
>>         request structure.
>>         Do i need to look some where else also??
>>
>>      
>>     If I understand correctly, then this was something I needed and I
>>     recently
>>     added to the Perl interface for agents, its available in the upcoming
>>     release, but only for IPv4 based requests, and I don't think
>>     it'll work
>>     for AgentX based agents either.
>     thanks for reply
>
>     I have traced packet from snmp_read. But there is still confusion
>     about Ipaddress of request. Can somebody clear the doubt.
>
>
> Can you be more specific?  What are you confused about?
> What  language are you using?
>
> If you are using Perl, your agent code would look something like this:
>
> if (!$agent) {
>     print "The mandatory Perl agent is not defined in this Net-SNMP 
> installation\n";
>     return;
> }
> $agent->register('myprog', '1.2.3.4', \&my_snmp_handler);
>
> sub my_snmp_handler {
>     my ($handler, $registration_info, $request_info, $requests) = @_;
>
>     my $targetIp = inet_ntoa($request_info->getTargetIp());
>     for (my $request = $requests; $request; $request = $request->next()) {
>         handle_oid($targetIp, $request_info, $request);
>     }
> }
>
>
I am using C language agent. There is netsnmp_request_info structure in 
agent. In table handler , through requests list handler finds the 
request to process.
But there is no method like getTargetIp(). It must be perl specific and 
there must be some alternate.
I will try to explore this . This must be looking in request info for Ip.

thanks

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