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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#if HAVE_AUDIT
#include <libaudit.h>
#endif
#include "sd-bus.h"
#include "alloc-util.h"
#include "bus-error.h"
#include "bus-locator.h"
#include "bus-util.h"
#include "format-util.h"
#include "log.h"
#include "macro.h"
#include "main-func.h"
#include "process-util.h"
#include "random-util.h"
#include "special.h"
#include "stdio-util.h"
#include "strv.h"
#include "unit-name.h"
#include "utmp-wtmp.h"
#include "verbs.h"
typedef struct Context {
sd_bus *bus;
#if HAVE_AUDIT
int audit_fd;
#endif
} Context;
static void context_clear(Context *c) {
assert(c);
c->bus = sd_bus_flush_close_unref(c->bus);
#if HAVE_AUDIT
if (c->audit_fd >= 0)
audit_close(c->audit_fd);
c->audit_fd = -EBADF;
#endif
}
static int get_startup_monotonic_time(Context *c, usec_t *ret) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
int r;
assert(c);
assert(ret);
r = bus_get_property_trivial(
c->bus,
bus_systemd_mgr,
"UserspaceTimestampMonotonic",
&error,
't', ret);
if (r < 0)
return log_warning_errno(r, "Failed to get timestamp, ignoring: %s", bus_error_message(&error, r));
return 0;
}
static int get_current_runlevel(Context *c) {
static const struct {
const int runlevel;
const char *special;
} table[] = {
/* The first target of this list that is active or has a job scheduled wins. We prefer
* runlevels 5 and 3 here over the others, since these are the main runlevels used on Fedora.
* It might make sense to change the order on some distributions. */
{ '5', SPECIAL_GRAPHICAL_TARGET },
{ '3', SPECIAL_MULTI_USER_TARGET },
{ '1', SPECIAL_RESCUE_TARGET },
};
int r;
assert(c);
for (unsigned n_attempts = 0;;) {
FOREACH_ELEMENT(e, table) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
_cleanup_free_ char *state = NULL, *path = NULL;
path = unit_dbus_path_from_name(e->special);
if (!path)
return log_oom();
r = sd_bus_get_property_string(
c->bus,
"org.freedesktop.systemd1",
path,
"org.freedesktop.systemd1.Unit",
"ActiveState",
&error,
&state);
if ((r == -ENOTCONN ||
sd_bus_error_has_names(&error,
SD_BUS_ERROR_NO_REPLY,
SD_BUS_ERROR_DISCONNECTED)) &&
++n_attempts < 64) {
/* systemd might have dropped off momentarily, let's not make this an error,
* and wait some random time. Let's pick a random time in the range 0ms…250ms,
* linearly scaled by the number of failed attempts. */
usec_t usec = random_u64_range(UINT64_C(10) * USEC_PER_MSEC +
UINT64_C(240) * USEC_PER_MSEC * n_attempts/64);
log_debug_errno(r, "Failed to get state of %s, retrying after %s: %s",
e->special, FORMAT_TIMESPAN(usec, USEC_PER_MSEC), bus_error_message(&error, r));
(void) usleep_safe(usec);
goto reconnect;
}
if (r < 0)
return log_warning_errno(r, "Failed to get state of %s: %s", e->special, bus_error_message(&error, r));
if (STR_IN_SET(state, "active", "reloading"))
return e->runlevel;
}
return 0;
reconnect:
c->bus = sd_bus_flush_close_unref(c->bus);
r = bus_connect_system_systemd(&c->bus);
if (r < 0)
return log_error_errno(r, "Failed to reconnect to system bus: %m");
}
}
static int on_reboot(int argc, char *argv[], void *userdata) {
Context *c = ASSERT_PTR(userdata);
usec_t t = 0, boottime;
int r, q = 0;
/* We finished start-up, so let's write the utmp record and send the audit msg. */
#if HAVE_AUDIT
if (c->audit_fd >= 0)
if (audit_log_user_comm_message(c->audit_fd, AUDIT_SYSTEM_BOOT, "", "systemd-update-utmp", NULL, NULL, NULL, 1) < 0 &&
errno != EPERM)
q = log_error_errno(errno, "Failed to send audit message: %m");
#endif
/* If this call fails, then utmp_put_reboot() will fix to the current time. */
(void) get_startup_monotonic_time(c, &t);
boottime = map_clock_usec(t, CLOCK_MONOTONIC, CLOCK_REALTIME);
/* We query the recorded monotonic time here (instead of the system clock CLOCK_REALTIME), even
* though we actually want the system clock time. That's because there's a likely chance that the
* system clock wasn't set right during early boot. By manually converting the monotonic clock to the
* system clock here we can compensate for incorrectly set clocks during early boot. */
r = utmp_put_reboot(boottime);
if (r < 0)
return log_error_errno(r, "Failed to write utmp record: %m");
return q;
}
static int on_shutdown(int argc, char *argv[], void *userdata) {
int r, q = 0;
/* We started shut-down, so let's write the utmp record and send the audit msg. */
#if HAVE_AUDIT
Context *c = ASSERT_PTR(userdata);
if (c->audit_fd >= 0)
if (audit_log_user_comm_message(c->audit_fd, AUDIT_SYSTEM_SHUTDOWN, "", "systemd-update-utmp", NULL, NULL, NULL, 1) < 0 &&
errno != EPERM)
q = log_error_errno(errno, "Failed to send audit message: %m");
#endif
r = utmp_put_shutdown();
if (r < 0)
return log_error_errno(r, "Failed to write utmp record: %m");
return q;
}
static int on_runlevel(int argc, char *argv[], void *userdata) {
Context *c = ASSERT_PTR(userdata);
int r, q = 0, previous, runlevel;
/* We finished changing runlevel, so let's write the utmp record and send the audit msg. */
/* First, get last runlevel */
r = utmp_get_runlevel(&previous, NULL);
if (r < 0) {
if (!IN_SET(r, -ESRCH, -ENOENT))
return log_error_errno(r, "Failed to get the last runlevel from utmp: %m");
previous = 0;
}
/* Secondly, get new runlevel */
runlevel = get_current_runlevel(c);
if (runlevel < 0)
return runlevel;
if (runlevel == 0) {
log_warning("Failed to get the current runlevel, utmp update skipped.");
return 0;
}
if (previous == runlevel)
return 0;
#if HAVE_AUDIT
if (c->audit_fd >= 0) {
char s[STRLEN("old-level=_ new-level=_") + 1];
xsprintf(s, "old-level=%c new-level=%c",
previous > 0 ? previous : 'N',
runlevel);
if (audit_log_user_comm_message(c->audit_fd, AUDIT_SYSTEM_RUNLEVEL, s,
"systemd-update-utmp", NULL, NULL, NULL, 1) < 0 && errno != EPERM)
q = log_error_errno(errno, "Failed to send audit message: %m");
}
#endif
r = utmp_put_runlevel(runlevel, previous);
if (r < 0 && !IN_SET(r, -ESRCH, -ENOENT))
return log_error_errno(r, "Failed to write utmp record: %m");
return q;
}
static int run(int argc, char *argv[]) {
static const Verb verbs[] = {
{ "reboot", 1, 1, 0, on_reboot },
{ "shutdown", 1, 1, 0, on_shutdown },
{ "runlevel", 1, 1, 0, on_runlevel },
{}
};
_cleanup_(context_clear) Context c = {
#if HAVE_AUDIT
.audit_fd = -EBADF,
#endif
};
int r;
log_setup();
umask(0022);
#if HAVE_AUDIT
/* If the kernel lacks netlink or audit support, don't worry about it. */
c.audit_fd = audit_open();
if (c.audit_fd < 0)
log_full_errno(IN_SET(errno, EAFNOSUPPORT, EPROTONOSUPPORT) ? LOG_DEBUG : LOG_WARNING,
errno, "Failed to connect to audit log, ignoring: %m");
#endif
r = bus_connect_system_systemd(&c.bus);
if (r < 0)
return log_error_errno(r, "Failed to get D-Bus connection: %m");
return dispatch_verb(argc, argv, verbs, &c);
}
DEFINE_MAIN_FUNCTION(run);
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