Leading spaces in SNMP values: Bug in process_poller_output?

[geofs]

Hi,

I had problems removing leading spaces from snmp values. I kept getting NaNs in my graphs.

I use VALUE/REGEXP in my snmp query XML.

SNMP Output:

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.1.3.6.1.4.1.2.3.51.1.2.20.1.5.1.1.3.1 = STRING: "  43.00 Centigrade"

Regex:

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<source>VALUE/REGEXP: *([0-9]{1,3}\.[0-9]{1,3}).*</source>

I inserted a little debug line in process_poller_output. This is what I get:

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06/21/2007 03:00:39 PM - POLLER: Poller[0] Output field value: '  43.00'

Notice the spaces before 43.00

I tried various syntaxes like

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<source>VALUE/REGEXP: *([0-9]{1,3}\.[0-9]{1,3}).*</source>
<source>VALUE/REGEXP: +([0-9]{1,3}\.[0-9]{1,3}).*</source>
<source>VALUE/REGEXP:[ ]*([0-9]{1,3}\.[0-9]{1,3}).*</source>
<source>VALUE/REGEXP:\s+([0-9]{1,3}\.[0-9]{1,3}).*</source>

Nothing works. I finally browsed through the poller.php code and modified it this way:

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        if (sizeof($results) > 0) {
                /* create an array keyed off of each .rrd file */
                foreach ($results as $item) {
-                       $value = rtrim(strtr(strtr($item["output"],'\r',''),'\n',''));
+                      $value = ltrim(rtrim(strtr(strtr($item["output"],'\r',''),'\n','')));
                        $unix_time = strtotime($item["time"]);

And now my graph works.

Is there a correct REGEXP syntax or is this a bug?

Thanks!

[rony]

The field is a string, hence they way it is parsed.

[geofs]

The field is a string, hence they way it is parsed.

Ok. So what is the correct way to extract the numeric value? Make a script? Btw there should be a way to get rid of those (mis-)leading spaces?

[geofs]

When I graph similar values via the OID field in a data template, it works. It seems that leading spaces, text and units are removed automatically. I still haven't found how to achieve the same result with VALUE/REGEXP.

Please can someone give some advice on this? It works with my little hack but I'd prefer to do without.

I tried a lot of possibilities but none worked.

Thanks,

[TheWitness]

Try it with the "trim" instead of "rtrim" and "ltrim". The trim command takes away both leading and trailing blanks, tabs and carriage returns, and a few other things from a string. Also, strtr is no longer required (so I have learned over the years now).

So the command would be:

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$value = trim($tem["output"]);

Let me know if that get's it.

TheWitness