| /* 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 "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 "utmp-wtmp.h" |
| |
| _const_ static usec_t when_wall(usec_t n, usec_t elapse) { |
| |
| usec_t left; |
| unsigned i; |
| 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; |
| |
| left = elapse - n; |
| |
| for (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, void *userdata) { |
| Manager *m = userdata; |
| const char *p; |
| |
| assert(m); |
| |
| if (!m->scheduled_shutdown_tty) |
| return true; |
| |
| p = path_startswith(tty, "/dev/"); |
| if (!p) |
| return true; |
| |
| return !streq(p, m->scheduled_shutdown_tty); |
| } |
| |
| static int warn_wall(Manager *m, usec_t n) { |
| char date[FORMAT_TIMESTAMP_MAX] = {}; |
| _cleanup_free_ char *l = NULL, *username = NULL; |
| usec_t left; |
| int r; |
| |
| assert(m); |
| |
| if (!m->enable_wall_messages) |
| return 0; |
| |
| left = m->scheduled_shutdown_timeout > n; |
| |
| r = asprintf(&l, "%s%sThe system is going down for %s %s%s!", |
| strempty(m->wall_message), |
| isempty(m->wall_message) ? "" : "\n", |
| m->scheduled_shutdown_type, |
| left ? "at " : "NOW", |
| left ? format_timestamp(date, sizeof(date), m->scheduled_shutdown_timeout) : ""); |
| if (r < 0) { |
| log_oom(); |
| return 0; |
| } |
| |
| username = uid_to_name(m->scheduled_shutdown_uid); |
| utmp_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 = userdata; |
| usec_t n, next; |
| int r; |
| |
| assert(m); |
| assert(s == m->wall_message_timeout_source); |
| |
| n = now(CLOCK_REALTIME); |
| |
| r = warn_wall(m, n); |
| if (r == 0) |
| return 0; |
| |
| 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) { |
| |
| usec_t n, elapse; |
| int r; |
| |
| assert(m); |
| |
| n = now(CLOCK_REALTIME); |
| elapse = m->scheduled_shutdown_timeout; |
| |
| /* wall message handling */ |
| |
| if (isempty(m->scheduled_shutdown_type)) { |
| warn_wall(m, n); |
| return 0; |
| } |
| |
| if (elapse < n) |
| return 0; |
| |
| /* Warn immediately if less than 15 minutes are left */ |
| if (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; |
| |
| if (m->wall_message_timeout_source) { |
| r = sd_event_source_set_time(m->wall_message_timeout_source, n + elapse); |
| if (r < 0) |
| return log_error_errno(r, "sd_event_source_set_time() failed. %m"); |
| |
| r = sd_event_source_set_enabled(m->wall_message_timeout_source, SD_EVENT_ONESHOT); |
| if (r < 0) |
| return log_error_errno(r, "sd_event_source_set_enabled() failed. %m"); |
| } else { |
| r = sd_event_add_time(m->event, &m->wall_message_timeout_source, |
| CLOCK_REALTIME, n + elapse, 0, wall_message_timeout_handler, m); |
| if (r < 0) |
| return log_error_errno(r, "sd_event_add_time() failed. %m"); |
| } |
| |
| return 0; |
| } |