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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <unistd.h>
#include "sd-messages.h"
#include "alloc-util.h"
#include "audit-util.h"
#include "bus-common-errors.h"
#include "bus-error.h"
#include "bus-util.h"
#include "event-util.h"
#include "format-util.h"
#include "logind.h"
#include "path-util.h"
#include "special.h"
#include "strv.h"
#include "unit-name.h"
#include "user-util.h"
#include "wall.h"
static usec_t when_wall(usec_t n, usec_t elapse) {
static const int wall_timers[] = {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
25, 40, 55, 70, 100, 130, 150, 180,
};
/* If the time is already passed, then don't announce */
if (n >= elapse)
return 0;
usec_t left = elapse - n;
for (unsigned i = 1; i < ELEMENTSOF(wall_timers); i++)
if (wall_timers[i] * USEC_PER_MINUTE >= left)
return left - wall_timers[i-1] * USEC_PER_MINUTE;
return left % USEC_PER_HOUR;
}
bool logind_wall_tty_filter(const char *tty, bool is_local, void *userdata) {
Manager *m = ASSERT_PTR(userdata);
assert(m->scheduled_shutdown_action);
const char *p = path_startswith(tty, "/dev/");
if (!p)
return true;
/* Do not send information about events which do not destroy local sessions to local terminals. We
* can assume that if the system enters sleep or hibernation, this will be visible in an obvious way
* for any local user. And once the systems exits sleep or hibernation, the notification would be
* just noise, in particular for auto-suspend. */
if (is_local && HANDLE_ACTION_IS_SLEEP(m->scheduled_shutdown_action->handle))
return false;
return !streq_ptr(p, m->scheduled_shutdown_tty);
}
static int warn_wall(Manager *m, usec_t n) {
assert(m);
if (!m->scheduled_shutdown_action)
return 0;
bool left = m->scheduled_shutdown_timeout > n;
_cleanup_free_ char *l = NULL;
if (asprintf(&l, "%s%sThe system will %s %s%s!",
strempty(m->wall_message),
isempty(m->wall_message) ? "" : "\n",
handle_action_verb_to_string(m->scheduled_shutdown_action->handle),
left ? "at " : "now",
left ? FORMAT_TIMESTAMP(m->scheduled_shutdown_timeout) : "") < 0) {
log_oom();
return 1; /* We're out-of-memory for now, but let's try to print the message later */
}
_cleanup_free_ char *username = uid_to_name(m->scheduled_shutdown_uid);
int level = left ? LOG_INFO : LOG_NOTICE;
log_struct(level,
LOG_MESSAGE("%s", l),
"ACTION=%s", handle_action_to_string(m->scheduled_shutdown_action->handle),
"MESSAGE_ID=" SD_MESSAGE_SHUTDOWN_SCHEDULED_STR,
username ? "OPERATOR=%s" : NULL, username);
if (m->enable_wall_messages)
(void) wall(l, username, m->scheduled_shutdown_tty, logind_wall_tty_filter, m);
return 1;
}
static int wall_message_timeout_handler(
sd_event_source *s,
uint64_t usec,
void *userdata) {
Manager *m = ASSERT_PTR(userdata);
int r;
assert(s == m->wall_message_timeout_source);
usec_t n = now(CLOCK_REALTIME);
r = warn_wall(m, n);
if (r == 0)
return 0;
usec_t next = when_wall(n, m->scheduled_shutdown_timeout);
if (next > 0) {
r = sd_event_source_set_time(s, n + next);
if (r < 0)
return log_error_errno(r, "sd_event_source_set_time() failed. %m");
r = sd_event_source_set_enabled(s, SD_EVENT_ONESHOT);
if (r < 0)
return log_error_errno(r, "sd_event_source_set_enabled() failed. %m");
}
return 0;
}
int manager_setup_wall_message_timer(Manager *m) {
int r;
assert(m);
usec_t n = now(CLOCK_REALTIME);
usec_t elapse = m->scheduled_shutdown_timeout;
/* wall message handling */
if (!m->scheduled_shutdown_action)
return 0;
if (elapse > 0 && elapse < n)
return 0;
/* Warn immediately if less than 15 minutes are left */
if (elapse == 0 || elapse - n < 15 * USEC_PER_MINUTE) {
r = warn_wall(m, n);
if (r == 0)
return 0;
}
elapse = when_wall(n, elapse);
if (elapse == 0)
return 0;
r = event_reset_time(m->event, &m->wall_message_timeout_source,
CLOCK_REALTIME,
n + elapse, 0,
wall_message_timeout_handler, m,
0, "wall-message-timer", true);
if (r < 0) {
m->wall_message_timeout_source = sd_event_source_unref(m->wall_message_timeout_source);
return log_error_errno(r, "Failed to set up wall message timer: %m");
}
return 0;
}
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