Nagios disfunctional , perhaps due to time change ?

[shadih rahman]

All
Is there an official patch for this?  can someone please advise on this?
Thanks

On Mon, Oct 26, 2009 at 1:36 PM, Ton Voon <ton.voon at opsera.com> wrote:

>
> On 26 Oct 2009, at 12:53, Matthias Flacke wrote:
>
>
> this change is causing the wrong reschedule:
>
> http://nagios.cvs.sourceforge.net/viewvc/nagios/nagios/base/utils.c?r1=1.236&r2=1.237&view=patch
>
> It has been applied on 15th of January 2009 and introduced some
> statements
>
> t->tm_isdst=-1;
>
> into base/utils.c.
>
> Affected are all Nagios versions >= 3.1.0.
>
> I could reproduce it here: if the patch above is backed out, the
> scheduling behaves correctly.
>
>
>
> I've managed to get a libtap test case with the failure now. As you
> correctly say, removing the t->tm_isdst=-1 in utils.c fixes it.
>
> However, the fact it works is lucky.
>
> The check is that the scheduled time is between a date_range_start and a
> date_range_end. This date_range_end is based on the timeperiod definitions.
> However, an end point of 00:00 is calculated as 24*60*60. Obviously, this is
> wrong on the day that the clocks go back as there are 25 hours in that day.
>
> So removing tm_isdst gets the calculation for the epoch time wrong, but
> that luckily works because the time falls within the 24 hour period.
>
> I've applied the patch to remove that single tm_isdst.
>
> Tests are also added now, for this specific issue.
>
> Long term, I think it is correct that the isdst flag be set, but there are
> other problems that are lurking in the code, such as the calculation for the
> next appropriate time.
>
> Any comments?
>
> Ton
>
>
>
>
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-- 
Cordially,
Shadhin Rahman
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