2008/10/13 Mike Ayers :
>> From: Clement Sciammas [mailto:csciammas@goodmailsystems.com]

>> We are using net-snmp 5.3.0.1-25.25 and.doing an extend query
>> that is returning a string but we would like it to return an
>> integer because it is used by another application that will
>> only accept integer input.
>
> The extend command only returns strings.

That's actually a slight over-simplification.
The extend command actually returns two values:

- the output of the command (a string), and
- the exit value of the command (an integer)

This latter value can be retrieved using the OID

.1.3.6.1.4.1.8072.1.3.2.3.1.4."index"

Unfortunately, this return code is limited to the
range 0-255 (being the values handled by _exit(2))
So that probably doesn't help you with this
particular problem.

Mike's suggestion of having the client side convert
from string to integer is probably the best approach.

Dave

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Mike/Dave,

Thanks for the help.

Unfortunately, the device making the query is a 3rd party load balancer that
we do not have the ability to modify. Is there a way other than extend to
get integer output of a local shell script?

Thanks
Clement

-----Original Message-----
From: Mike Ayers [mailto:mike_ayers@tvworks.com]
Sent: Monday, October 13, 2008 11:25 AM
To: Clement Sciammas; net-snmp-users@lists.sourceforge.net
Subject: RE: String to Integer

> From: Clement Sciammas [mailto:csciammas@goodmailsystems.com]
> Sent: Friday, October 10, 2008 10:47 AM

> We are using net-snmp 5.3.0.1-25.25 and.doing an extend query
> that is returning a string but we would like it to return an
> integer because it is used by another application that will
> only accept integer input. Here is the output from snmpget:

The extend command only returns strings. You will need to parse the
output line into an integer type in whatever scripting language or adapter
you are using to process the output.


HTH,

Mike


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2008/10/13 Clement Sciammas :
> Unfortunately, the device making the query is a 3rd party load balancer that
> we do not have the ability to modify. Is there a way other than extend to
> get integer output of a local shell script?

There are basically two ways to extend the agent.

One way is use a fixed-format MIB output, which is the approach
used by the "extend" (and similar) directives. The advantage is
that the agent script doesn't have to do anything special, and can
be ignorant of SNMP completely. The disadvantage is that the
client side has be a little more flexible, and adapt to this fixes format.

The alternative is to have a specific MIB, more tightly focused on
the precise requirements of the client side. That makes things
simpler for the client, but does mean that the agent has to do a
bit more work to match this MIB.

It does sound as if that's the way you'll need to go.
That doesn't mean you have to descend into the murky
depths of writing a fully-fledged C module. Have a look
at the "pass" directive - that ought to be sufficient.

Dave

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