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plugins: add configure support for overriding RTC fallback datetime

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Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
This commit is contained in:
Joachim Wiberg
2023-04-10 16:35:42 +02:00
parent 1f4acb322a
commit 42ef3d3cf7
2 changed files with 38 additions and 8 deletions
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plugins/rtc.c
+25 -8
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@@ -21,6 +21,8 @@
* THE SOFTWARE.
*/
#include "config.h"
#include <time.h>
#include <sys/ioctl.h>
#include <linux/rtc.h>
@@ -35,7 +37,13 @@
#include "plugin.h"
/* Kernel RTC driver validates against this date for sanity check */
#define RTC_TIMESTAMP_BEGIN_2000 946684800LL /* 2000-01-01 00:00:00 */
#define RTC_TIMESTAMP_BEGIN_2000 "2000-01-01 00:00:00"
#ifdef RTC_TIMESTAMP_CUSTOM
static char *rtc_timestamp = RTC_TIMESTAMP_CUSTOM;
#else
static char *rtc_timestamp = RTC_TIMESTAMP_BEGIN_2000;
#endif
static time_t rtc_date_fallback = 946684800LL;
static void tz_set(char *tz, size_t len)
{
@@ -99,10 +107,10 @@ static void rtc_save(void *arg)
tz_set(tz, sizeof(tz));
rc = gettimeofday(&tv, NULL);
if (rc < 0 || tv.tv_sec < RTC_TIMESTAMP_BEGIN_2000) {
if (rc < 0 || tv.tv_sec < rtc_date_fallback) {
print_desc(NULL, "System clock invalid, not saving to RTC");
invalid:
logit(LOG_ERR, "System clock invalid, before 2000-01-01 00:00, not saving to RTC");
logit(LOG_ERR, "System clock invalid, before %s, not saving to RTC", rtc_timestamp);
rc = 2;
goto out;
}
@@ -136,8 +144,10 @@ static void rtc_restore(void *arg)
}
fd = rtc_open();
if (fd < 0)
if (fd < 0) {
logit(LOG_NOTICE, "System has no RTC (missing driver?), skipping restore.");
return;
}
tz_set(tz, sizeof(tz));
if (ioctl(fd, RTC_RD_TIME, &tm) < 0) {
@@ -151,7 +161,7 @@ static void rtc_restore(void *arg)
invalid:
logit(LOG_ERR, "Failed restoring system clock from RTC.");
if (EINVAL == errno)
logit(LOG_ERR, "RTC time is too old (before 2000-01-01 00:00)");
logit(LOG_ERR, "RTC time is too old (before %s)", rtc_timestamp);
else if (ENOENT == errno)
logit(LOG_ERR, "RTC has no previously saved (valid) time.");
else
@@ -162,18 +172,18 @@ static void rtc_restore(void *arg)
goto out;
/* Attempt to set RTC to a sane value ... */
tv.tv_sec = RTC_TIMESTAMP_BEGIN_2000;
tv.tv_sec = rtc_date_fallback;
if (!gmtime_r(&tv.tv_sec, &tm))
goto out;
logit(LOG_NOTICE, "Resetting RTC to kernel default, 2000-01-01 00:00.");
logit(LOG_NOTICE, "Resetting RTC to kernel default, %s.", rtc_timestamp);
rc = 2;
}
print_desc(NULL, "Restoring system clock (UTC) from RTC");
tm.tm_isdst = -1; /* Use tzdata to figure it out, please. */
tv.tv_sec = mktime(&tm);
if (tv.tv_sec < RTC_TIMESTAMP_BEGIN_2000) {
if (tv.tv_sec < rtc_date_fallback) {
errno = EINVAL;
goto invalid;
}
@@ -199,6 +209,13 @@ static plugin_t plugin = {
PLUGIN_INIT(plugin_init)
{
struct tm tm = { 0 };
if (!strptime(rtc_timestamp, "%Y-%m-%d %H:%M", &tm))
rtc_date_fallback = mktime(&tm);
else
rtc_timestamp = RTC_TIMESTAMP_BEGIN_2000;
plugin_register(&plugin);
}