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-rw-r--r--src/login/logind-utmp.c182
1 files changed, 182 insertions, 0 deletions
diff --git a/src/login/logind-utmp.c b/src/login/logind-utmp.c
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+++ b/src/login/logind-utmp.c
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+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2015 Daniel Mack
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+#include <pwd.h>
+
+#include "sd-messages.h"
+#include "strv.h"
+#include "special.h"
+#include "unit-name.h"
+#include "audit.h"
+#include "bus-util.h"
+#include "bus-error.h"
+#include "bus-common-errors.h"
+#include "logind.h"
+#include "formats-util.h"
+#include "utmp-wtmp.h"
+
+_const_ static usec_t when_wall(usec_t n, usec_t elapse) {
+
+ usec_t left;
+ unsigned int 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;
+
+ assert(m);
+
+ if (!startswith(tty, "/dev/"))
+ return true;
+
+ return !streq(tty + 5, m->scheduled_shutdown_tty);
+}
+
+static int warn_wall(Manager *m, usec_t n) {
+ char date[FORMAT_TIMESTAMP_MAX] = {};
+ _cleanup_free_ char *l = 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;
+ }
+
+ utmp_wall(l, lookup_uid(m->scheduled_shutdown_uid),
+ 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\n");
+
+ 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\n");
+ }
+
+ 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\n");
+
+ 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\n");
+ } 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\n");
+ }
+
+ return 0;
+}