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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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31
conf.c
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@@ -98,6 +98,7 @@ static void parse_noclientlog(const char *);
static void parse_clientloglimit(const char *);
static void parse_fallbackdrift(const char *);
static void parse_makestep(const char *);
static void parse_maxchange(const char *);
static void parse_logchange(const char *);
static void parse_mailonchange(const char *);
static void parse_bindaddress(const char *);
@@ -168,6 +169,12 @@ static int rtc_sync = 0;
static int make_step_limit = 0;
static double make_step_threshold = 0.0;
/* Number of updates before offset checking, number of ignored updates
before exiting and the maximum allowed offset */
static int max_offset_delay = -1;
static int max_offset_ignore;
static double max_offset;
/* Flag set if we should log to syslog when a time adjustment
exceeding the threshold is initiated */
static int do_log_change = 0;
@@ -257,6 +264,7 @@ static const Command commands[] = {
{"clientloglimit", 14, parse_clientloglimit},
{"fallbackdrift", 13, parse_fallbackdrift},
{"makestep", 8, parse_makestep},
{"maxchange", 9, parse_maxchange},
{"logchange", 9, parse_logchange},
{"mailonchange", 12, parse_mailonchange},
{"bindaddress", 11, parse_bindaddress},
@@ -943,6 +951,19 @@ parse_makestep(const char *line)
/* ================================================== */
static void
parse_maxchange(const char *line)
{
if (sscanf(line, "%lf %d %d", &max_offset, &max_offset_delay, &max_offset_ignore) != 3) {
max_offset_delay = -1;
LOG(LOGS_WARN, LOGF_Configure,
"Could not read offset, check delay or ignore limit for maximum change at line %d\n",
line_number);
}
}
/* ================================================== */
static void
parse_logchange(const char *line)
{
@@ -1567,6 +1588,16 @@ CNF_GetMakeStep(int *limit, double *threshold)
/* ================================================== */
void
CNF_GetMaxChange(int *delay, int *ignore, double *offset)
{
*delay = max_offset_delay;
*ignore = max_offset_ignore;
*offset = max_offset;
}
/* ================================================== */
void
CNF_GetLogChange(int *enabled, double *threshold)
{