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samplefilt: check for non-increasing sample times

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Adopt the check from the refclock code to check also samples from NTP.
This commit is contained in:
Miroslav Lichvar
2018-08-23 14:19:16 +02:00
parent cffc856b50
commit bba29a0ee7
3 changed files with 34 additions and 11 deletions
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24
samplefilt.c
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@@ -102,9 +102,30 @@ SPF_DestroyInstance(SPF_Instance filter)
/* ================================================== */
void
/* Check that samples times are strictly increasing */
static int
check_sample(SPF_Instance filter, NTP_Sample *sample)
{
if (filter->used <= 0)
return 1;
if (UTI_CompareTimespecs(&filter->samples[filter->last].time, &sample->time) >= 0) {
DEBUG_LOG("filter non-increasing sample time %s", UTI_TimespecToString(&sample->time));
return 0;
}
return 1;
}
/* ================================================== */
int
SPF_AccumulateSample(SPF_Instance filter, NTP_Sample *sample)
{
if (!check_sample(filter, sample))
return 0;
filter->index++;
filter->index %= filter->max_samples;
filter->last = filter->index;
@@ -116,6 +137,7 @@ SPF_AccumulateSample(SPF_Instance filter, NTP_Sample *sample)
DEBUG_LOG("filter sample %d t=%s offset=%.9f peer_disp=%.9f",
filter->index, UTI_TimespecToString(&sample->time),
sample->offset, sample->peer_dispersion);
return 1;
}
/* ================================================== */