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Add maxchange directive

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This directive sets the maximum allowed offset corrected on a clock
update.  The check is performed only after the specified number of
updates to allow a large initial adjustment of the system clock.  When
an offset larger than the specified maximum occurs, it will be ignored
for the specified number of times and then chronyd will give up
and exit (a negative value can be used to never exit).  In both cases
a message is sent to syslog.
This commit is contained in:
Miroslav Lichvar
2012-02-21 14:34:09 +01:00
parent a8956f2f56
commit f7c65a4b88
4 changed files with 94 additions and 4 deletions
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44
reference.c
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@@ -68,6 +68,12 @@ static int initialised = 0;
static int make_step_limit;
static double make_step_threshold;
/* Number of updates before offset checking, number of ignored updates
before exiting and the maximum allowed offset */
static int max_offset_delay;
static int max_offset_ignore;
static double max_offset;
/* Flag and threshold for logging clock changes to syslog */
static int do_log_change;
static double log_change_threshold;
@@ -191,6 +197,7 @@ REF_Initialise(void)
enable_local_stratum = CNF_AllowLocalReference(&local_stratum);
CNF_GetMakeStep(&make_step_limit, &make_step_threshold);
CNF_GetMaxChange(&max_offset_delay, &max_offset_ignore, &max_offset);
CNF_GetLogChange(&do_log_change, &log_change_threshold);
CNF_GetMailOnChange(&do_mail_change, &mail_change_threshold, &mail_change_user);
@@ -492,6 +499,33 @@ maybe_make_step()
/* ================================================== */
static int
is_offset_ok(double offset)
{
if (max_offset_delay < 0)
return 1;
if (max_offset_delay > 0) {
max_offset_delay--;
return 1;
}
offset = fabs(offset);
if (offset > max_offset) {
LOG(LOGS_WARN, LOGF_Reference,
"Adjustment of %.3f seconds exceeds the allowed maximum of %.3f seconds (%s) ",
offset, max_offset, !max_offset_ignore ? "exiting" : "ignored");
if (!max_offset_ignore)
SCH_QuitProgram();
else if (max_offset_ignore > 0)
max_offset_ignore--;
return 0;
}
return 1;
}
/* ================================================== */
static void
update_leap_status(NTP_Leap leap)
{
@@ -594,6 +628,12 @@ REF_SetReference(int stratum,
}
}
LCL_ReadCookedTime(&now, NULL);
UTI_DiffTimevalsToDouble(&elapsed, &now, ref_time);
our_offset = offset + elapsed * frequency;
if (!is_offset_ok(offset))
return;
are_we_synchronised = 1;
our_stratum = stratum + 1;
@@ -606,10 +646,6 @@ REF_SetReference(int stratum,
our_root_delay = root_delay;
our_root_dispersion = root_dispersion;
LCL_ReadCookedTime(&now, NULL);
UTI_DiffTimevalsToDouble(&elapsed, &now, ref_time);
our_offset = offset + elapsed * frequency;
update_leap_status(leap);
if (last_ref_update.tv_sec) {