Prep v230: Add utmp support to make wall message to work properly.

[elogind.git] / src / login / logind-utmp.c

diff --git a/src/login/logind-utmp.c b/src/login/logind-utmp.c
new file mode 100644 (file)
index 0000000..d959a4a
--- /dev/null
+++ b/src/login/logind-utmp.c
@@ -0,0 +1,183 @@
+/***
+  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 <pwd.h>
+#include <string.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 "formats-util.h"
+#include "logind.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 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/") || !m->scheduled_shutdown_tty)
+                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, uid_to_name(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");
+
+                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;
+}