diff options
Diffstat (limited to 'src/grp-login/systemd-logind/logind-utmp.c')
| -rw-r--r-- | src/grp-login/systemd-logind/logind-utmp.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/src/grp-login/systemd-logind/logind-utmp.c b/src/grp-login/systemd-logind/logind-utmp.c new file mode 100644 index 0000000000..319718ca57 --- /dev/null +++ b/src/grp-login/systemd-logind/logind-utmp.c @@ -0,0 +1,184 @@ +/*** + 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 <systemd/sd-messages.h> + +#include "sd-bus/bus-common-errors.h" +#include "sd-bus/bus-error.h" +#include "sd-bus/bus-util.h" +#include "systemd-basic/alloc-util.h" +#include "systemd-basic/audit-util.h" +#include "systemd-basic/formats-util.h" +#include "systemd-basic/special.h" +#include "systemd-basic/strv.h" +#include "systemd-basic/unit-name.h" +#include "systemd-basic/user-util.h" +#include "systemd-shared/utmp-wtmp.h" + +#include "logind.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; +} |