/* SPDX-License-Identifier: LGPL-2.1+ */ #include #include #include #include #include "sd-daemon.h" #include "sd-device.h" #include "alloc-util.h" #include "bus-error.h" #include "bus-util.h" #include "cgroup-util.h" #include "def.h" #include "device-util.h" #include "dirent-util.h" #include "fd-util.h" #include "format-util.h" #include "fs-util.h" #include "logind-dbus.h" #include "logind-seat-dbus.h" #include "logind-session-dbus.h" #include "logind-user-dbus.h" #include "logind.h" #include "main-func.h" #include "parse-util.h" #include "process-util.h" #include "selinux-util.h" #include "signal-util.h" #include "strv.h" #include "terminal-util.h" #include "udev-util.h" static Manager* manager_unref(Manager *m); DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_unref); static int manager_new(Manager **ret) { _cleanup_(manager_unrefp) Manager *m = NULL; int r; assert(ret); m = new(Manager, 1); if (!m) return -ENOMEM; *m = (Manager) { .console_active_fd = -1, .reserve_vt_fd = -1, .idle_action_not_before_usec = now(CLOCK_MONOTONIC), }; m->devices = hashmap_new(&string_hash_ops); m->seats = hashmap_new(&string_hash_ops); m->sessions = hashmap_new(&string_hash_ops); m->sessions_by_leader = hashmap_new(NULL); m->users = hashmap_new(NULL); m->inhibitors = hashmap_new(&string_hash_ops); m->buttons = hashmap_new(&string_hash_ops); m->user_units = hashmap_new(&string_hash_ops); m->session_units = hashmap_new(&string_hash_ops); if (!m->devices || !m->seats || !m->sessions || !m->sessions_by_leader || !m->users || !m->inhibitors || !m->buttons || !m->user_units || !m->session_units) return -ENOMEM; r = sd_event_default(&m->event); if (r < 0) return r; r = sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL); if (r < 0) return r; r = sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL); if (r < 0) return r; (void) sd_event_set_watchdog(m->event, true); manager_reset_config(m); *ret = TAKE_PTR(m); return 0; } static Manager* manager_unref(Manager *m) { Session *session; User *u; Device *d; Seat *s; Inhibitor *i; Button *b; if (!m) return NULL; while ((session = hashmap_first(m->sessions))) session_free(session); while ((u = hashmap_first(m->users))) user_free(u); while ((d = hashmap_first(m->devices))) device_free(d); while ((s = hashmap_first(m->seats))) seat_free(s); while ((i = hashmap_first(m->inhibitors))) inhibitor_free(i); while ((b = hashmap_first(m->buttons))) button_free(b); hashmap_free(m->devices); hashmap_free(m->seats); hashmap_free(m->sessions); hashmap_free(m->sessions_by_leader); hashmap_free(m->users); hashmap_free(m->inhibitors); hashmap_free(m->buttons); hashmap_free(m->brightness_writers); hashmap_free(m->user_units); hashmap_free(m->session_units); sd_event_source_unref(m->idle_action_event_source); sd_event_source_unref(m->inhibit_timeout_source); sd_event_source_unref(m->scheduled_shutdown_timeout_source); sd_event_source_unref(m->nologin_timeout_source); sd_event_source_unref(m->wall_message_timeout_source); sd_event_source_unref(m->console_active_event_source); sd_event_source_unref(m->lid_switch_ignore_event_source); #if ENABLE_UTMP sd_event_source_unref(m->utmp_event_source); #endif safe_close(m->console_active_fd); sd_device_monitor_unref(m->device_seat_monitor); sd_device_monitor_unref(m->device_monitor); sd_device_monitor_unref(m->device_vcsa_monitor); sd_device_monitor_unref(m->device_button_monitor); if (m->unlink_nologin) (void) unlink_or_warn("/run/nologin"); bus_verify_polkit_async_registry_free(m->polkit_registry); sd_bus_flush_close_unref(m->bus); sd_event_unref(m->event); safe_close(m->reserve_vt_fd); strv_free(m->kill_only_users); strv_free(m->kill_exclude_users); free(m->scheduled_shutdown_type); free(m->scheduled_shutdown_tty); free(m->wall_message); free(m->action_job); return mfree(m); } static int manager_enumerate_devices(Manager *m) { _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL; sd_device *d; int r; assert(m); /* Loads devices from udev and creates seats for them as * necessary */ r = sd_device_enumerator_new(&e); if (r < 0) return r; r = sd_device_enumerator_add_match_tag(e, "master-of-seat"); if (r < 0) return r; FOREACH_DEVICE(e, d) { int k; k = manager_process_seat_device(m, d); if (k < 0) r = k; } return r; } static int manager_enumerate_buttons(Manager *m) { _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL; sd_device *d; int r; assert(m); /* Loads buttons from udev */ if (manager_all_buttons_ignored(m)) return 0; r = sd_device_enumerator_new(&e); if (r < 0) return r; r = sd_device_enumerator_add_match_subsystem(e, "input", true); if (r < 0) return r; r = sd_device_enumerator_add_match_tag(e, "power-switch"); if (r < 0) return r; FOREACH_DEVICE(e, d) { int k; k = manager_process_button_device(m, d); if (k < 0) r = k; } return r; } static int manager_enumerate_seats(Manager *m) { _cleanup_closedir_ DIR *d = NULL; struct dirent *de; int r = 0; assert(m); /* This loads data about seats stored on disk, but does not * actually create any seats. Removes data of seats that no * longer exist. */ d = opendir("/run/systemd/seats"); if (!d) { if (errno == ENOENT) return 0; return log_error_errno(errno, "Failed to open /run/systemd/seats: %m"); } FOREACH_DIRENT(de, d, return -errno) { Seat *s; int k; if (!dirent_is_file(de)) continue; s = hashmap_get(m->seats, de->d_name); if (!s) { if (unlinkat(dirfd(d), de->d_name, 0) < 0) log_warning("Failed to remove /run/systemd/seats/%s: %m", de->d_name); continue; } k = seat_load(s); if (k < 0) r = k; } return r; } static int manager_enumerate_linger_users(Manager *m) { _cleanup_closedir_ DIR *d = NULL; struct dirent *de; int r = 0; assert(m); d = opendir("/var/lib/systemd/linger"); if (!d) { if (errno == ENOENT) return 0; return log_error_errno(errno, "Failed to open /var/lib/systemd/linger/: %m"); } FOREACH_DIRENT(de, d, return -errno) { int k; if (!dirent_is_file(de)) continue; k = manager_add_user_by_name(m, de->d_name, NULL); if (k < 0) r = log_warning_errno(k, "Couldn't add lingering user %s, ignoring: %m", de->d_name); } return r; } static int manager_enumerate_users(Manager *m) { _cleanup_closedir_ DIR *d = NULL; struct dirent *de; int r, k; assert(m); /* Add lingering users */ r = manager_enumerate_linger_users(m); /* Read in user data stored on disk */ d = opendir("/run/systemd/users"); if (!d) { if (errno == ENOENT) return 0; return log_error_errno(errno, "Failed to open /run/systemd/users: %m"); } FOREACH_DIRENT(de, d, return -errno) { User *u; if (!dirent_is_file(de)) continue; k = manager_add_user_by_name(m, de->d_name, &u); if (k < 0) { r = log_warning_errno(k, "Failed to add user by file name %s, ignoring: %m", de->d_name); continue; } user_add_to_gc_queue(u); k = user_load(u); if (k < 0) r = k; } return r; } static int parse_fdname(const char *fdname, char **session_id, dev_t *dev) { _cleanup_strv_free_ char **parts = NULL; _cleanup_free_ char *id = NULL; unsigned major, minor; int r; parts = strv_split(fdname, "-"); if (!parts) return -ENOMEM; if (strv_length(parts) != 5) return -EINVAL; if (!streq(parts[0], "session")) return -EINVAL; id = strdup(parts[1]); if (!id) return -ENOMEM; if (!streq(parts[2], "device")) return -EINVAL; r = safe_atou(parts[3], &major); if (r < 0) return r; r = safe_atou(parts[4], &minor); if (r < 0) return r; *dev = makedev(major, minor); *session_id = TAKE_PTR(id); return 0; } static int deliver_fd(Manager *m, const char *fdname, int fd) { _cleanup_free_ char *id = NULL; SessionDevice *sd; struct stat st; Session *s; dev_t dev; int r; assert(m); assert(fd >= 0); r = parse_fdname(fdname, &id, &dev); if (r < 0) return log_debug_errno(r, "Failed to parse fd name %s: %m", fdname); s = hashmap_get(m->sessions, id); if (!s) /* If the session doesn't exist anymore, the associated session device attached to this fd * doesn't either. Let's simply close this fd. */ return log_debug_errno(SYNTHETIC_ERRNO(ENXIO), "Failed to attach fd for unknown session: %s", id); if (fstat(fd, &st) < 0) /* The device is allowed to go away at a random point, in which case fstat() failing is * expected. */ return log_debug_errno(errno, "Failed to stat device fd for session %s: %m", id); if (!S_ISCHR(st.st_mode) || st.st_rdev != dev) return log_debug_errno(SYNTHETIC_ERRNO(ENODEV), "Device fd doesn't point to the expected character device node"); sd = hashmap_get(s->devices, &dev); if (!sd) /* Weird, we got an fd for a session device which wasn't recorded in the session state * file... */ return log_warning_errno(SYNTHETIC_ERRNO(ENODEV), "Got fd for missing session device [%u:%u] in session %s", major(dev), minor(dev), s->id); log_debug("Attaching fd to session device [%u:%u] for session %s", major(dev), minor(dev), s->id); session_device_attach_fd(sd, fd, s->was_active); return 0; } static int manager_attach_fds(Manager *m) { _cleanup_strv_free_ char **fdnames = NULL; int n; /* Upon restart, PID1 will send us back all fds of session devices that we previously opened. Each * file descriptor is associated with a given session. The session ids are passed through FDNAMES. */ n = sd_listen_fds_with_names(true, &fdnames); if (n < 0) return log_warning_errno(n, "Failed to acquire passed fd list: %m"); if (n == 0) return 0; for (int i = 0; i < n; i++) { int fd = SD_LISTEN_FDS_START + i; if (deliver_fd(m, fdnames[i], fd) >= 0) continue; /* Hmm, we couldn't deliver the fd to any session device object? If so, let's close the fd */ safe_close(fd); /* Remove from fdstore as well */ (void) sd_notifyf(false, "FDSTOREREMOVE=1\n" "FDNAME=%s", fdnames[i]); } return 0; } static int manager_enumerate_sessions(Manager *m) { _cleanup_closedir_ DIR *d = NULL; struct dirent *de; int r = 0, k; assert(m); /* Read in session data stored on disk */ d = opendir("/run/systemd/sessions"); if (!d) { if (errno == ENOENT) return 0; return log_error_errno(errno, "Failed to open /run/systemd/sessions: %m"); } FOREACH_DIRENT(de, d, return -errno) { struct Session *s; if (!dirent_is_file(de)) continue; k = manager_add_session(m, de->d_name, &s); if (k < 0) { r = log_warning_errno(k, "Failed to add session by file name %s, ignoring: %m", de->d_name); continue; } session_add_to_gc_queue(s); k = session_load(s); if (k < 0) r = k; } /* We might be restarted and PID1 could have sent us back the session device fds we previously * saved. */ (void) manager_attach_fds(m); return r; } static int manager_enumerate_inhibitors(Manager *m) { _cleanup_closedir_ DIR *d = NULL; struct dirent *de; int r = 0; assert(m); d = opendir("/run/systemd/inhibit"); if (!d) { if (errno == ENOENT) return 0; return log_error_errno(errno, "Failed to open /run/systemd/inhibit: %m"); } FOREACH_DIRENT(de, d, return -errno) { int k; Inhibitor *i; if (!dirent_is_file(de)) continue; k = manager_add_inhibitor(m, de->d_name, &i); if (k < 0) { r = log_warning_errno(k, "Couldn't add inhibitor %s, ignoring: %m", de->d_name); continue; } k = inhibitor_load(i); if (k < 0) r = k; } return r; } static int manager_dispatch_seat_udev(sd_device_monitor *monitor, sd_device *device, void *userdata) { Manager *m = userdata; assert(m); assert(device); manager_process_seat_device(m, device); return 0; } static int manager_dispatch_device_udev(sd_device_monitor *monitor, sd_device *device, void *userdata) { Manager *m = userdata; assert(m); assert(device); manager_process_seat_device(m, device); return 0; } static int manager_dispatch_vcsa_udev(sd_device_monitor *monitor, sd_device *device, void *userdata) { Manager *m = userdata; const char *name; assert(m); assert(device); /* Whenever a VCSA device is removed try to reallocate our * VTs, to make sure our auto VTs never go away. */ if (sd_device_get_sysname(device, &name) >= 0 && startswith(name, "vcsa") && device_for_action(device, DEVICE_ACTION_REMOVE)) seat_preallocate_vts(m->seat0); return 0; } static int manager_dispatch_button_udev(sd_device_monitor *monitor, sd_device *device, void *userdata) { Manager *m = userdata; assert(m); assert(device); manager_process_button_device(m, device); return 0; } static int manager_dispatch_console(sd_event_source *s, int fd, uint32_t revents, void *userdata) { Manager *m = userdata; assert(m); assert(m->seat0); assert(m->console_active_fd == fd); seat_read_active_vt(m->seat0); return 0; } static int manager_reserve_vt(Manager *m) { _cleanup_free_ char *p = NULL; assert(m); if (m->reserve_vt <= 0) return 0; if (asprintf(&p, "/dev/tty%u", m->reserve_vt) < 0) return log_oom(); m->reserve_vt_fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); if (m->reserve_vt_fd < 0) { /* Don't complain on VT-less systems */ if (errno != ENOENT) log_warning_errno(errno, "Failed to pin reserved VT: %m"); return -errno; } return 0; } static int manager_connect_bus(Manager *m) { int r; assert(m); assert(!m->bus); r = sd_bus_default_system(&m->bus); if (r < 0) return log_error_errno(r, "Failed to connect to system bus: %m"); r = sd_bus_add_object_vtable(m->bus, NULL, "/org/freedesktop/login1", "org.freedesktop.login1.Manager", manager_vtable, m); if (r < 0) return log_error_errno(r, "Failed to add manager object vtable: %m"); r = sd_bus_add_fallback_vtable(m->bus, NULL, "/org/freedesktop/login1/seat", "org.freedesktop.login1.Seat", seat_vtable, seat_object_find, m); if (r < 0) return log_error_errno(r, "Failed to add seat object vtable: %m"); r = sd_bus_add_node_enumerator(m->bus, NULL, "/org/freedesktop/login1/seat", seat_node_enumerator, m); if (r < 0) return log_error_errno(r, "Failed to add seat enumerator: %m"); r = sd_bus_add_fallback_vtable(m->bus, NULL, "/org/freedesktop/login1/session", "org.freedesktop.login1.Session", session_vtable, session_object_find, m); if (r < 0) return log_error_errno(r, "Failed to add session object vtable: %m"); r = sd_bus_add_node_enumerator(m->bus, NULL, "/org/freedesktop/login1/session", session_node_enumerator, m); if (r < 0) return log_error_errno(r, "Failed to add session enumerator: %m"); r = sd_bus_add_fallback_vtable(m->bus, NULL, "/org/freedesktop/login1/user", "org.freedesktop.login1.User", user_vtable, user_object_find, m); if (r < 0) return log_error_errno(r, "Failed to add user object vtable: %m"); r = sd_bus_add_node_enumerator(m->bus, NULL, "/org/freedesktop/login1/user", user_node_enumerator, m); if (r < 0) return log_error_errno(r, "Failed to add user enumerator: %m"); r = sd_bus_match_signal_async( m->bus, NULL, "org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "JobRemoved", match_job_removed, NULL, m); if (r < 0) return log_error_errno(r, "Failed to request match for JobRemoved: %m"); r = sd_bus_match_signal_async( m->bus, NULL, "org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "UnitRemoved", match_unit_removed, NULL, m); if (r < 0) return log_error_errno(r, "Failed to request match for UnitRemoved: %m"); r = sd_bus_match_signal_async( m->bus, NULL, "org.freedesktop.systemd1", NULL, "org.freedesktop.DBus.Properties", "PropertiesChanged", match_properties_changed, NULL, m); if (r < 0) return log_error_errno(r, "Failed to request match for PropertiesChanged: %m"); r = sd_bus_match_signal_async( m->bus, NULL, "org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "Reloading", match_reloading, NULL, m); if (r < 0) return log_error_errno(r, "Failed to request match for Reloading: %m"); r = sd_bus_call_method_async( m->bus, NULL, "org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "Subscribe", NULL, NULL, NULL); if (r < 0) return log_error_errno(r, "Failed to enable subscription: %m"); r = sd_bus_request_name_async(m->bus, NULL, "org.freedesktop.login1", 0, NULL, NULL); if (r < 0) return log_error_errno(r, "Failed to request name: %m"); r = sd_bus_attach_event(m->bus, m->event, SD_EVENT_PRIORITY_NORMAL); if (r < 0) return log_error_errno(r, "Failed to attach bus to event loop: %m"); return 0; } static int manager_vt_switch(sd_event_source *src, const struct signalfd_siginfo *si, void *data) { Manager *m = data; Session *active, *iter; /* * We got a VT-switch signal and we have to acknowledge it immediately. * Preferably, we'd just use m->seat0->active->vtfd, but unfortunately, * old user-space might run multiple sessions on a single VT, *sigh*. * Therefore, we have to iterate all sessions and find one with a vtfd * on the requested VT. * As only VTs with active controllers have VT_PROCESS set, our current * notion of the active VT might be wrong (for instance if the switch * happens while we setup VT_PROCESS). Therefore, read the current VT * first and then use s->active->vtnr as reference. Note that this is * not racy, as no further VT-switch can happen as long as we're in * synchronous VT_PROCESS mode. */ assert(m->seat0); seat_read_active_vt(m->seat0); active = m->seat0->active; if (!active || active->vtnr < 1) { _cleanup_close_ int fd = -1; int r; /* We are requested to acknowledge the VT-switch signal by the kernel but * there's no registered sessions for the current VT. Normally this * shouldn't happen but something wrong might have happened when we tried * to release the VT. Better be safe than sorry, and try to release the VT * one more time otherwise the user will be locked with the current VT. */ log_warning("Received VT_PROCESS signal without a registered session, restoring VT."); /* At this point we only have the kernel mapping for referring to the * current VT. */ fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); if (fd < 0) { log_warning_errno(fd, "Failed to open, ignoring: %m"); return 0; } r = vt_release(fd, true); if (r < 0) log_warning_errno(r, "Failed to release VT, ignoring: %m"); return 0; } if (active->vtfd >= 0) { session_leave_vt(active); } else { LIST_FOREACH(sessions_by_seat, iter, m->seat0->sessions) { if (iter->vtnr == active->vtnr && iter->vtfd >= 0) { session_leave_vt(iter); break; } } } return 0; } static int manager_connect_console(Manager *m) { int r; assert(m); assert(m->console_active_fd < 0); /* On certain systems (such as S390, Xen, and containers) /dev/tty0 does not exist (as there is no VC), so * don't fail if we can't open it. */ if (access("/dev/tty0", F_OK) < 0) return 0; m->console_active_fd = open("/sys/class/tty/tty0/active", O_RDONLY|O_NOCTTY|O_CLOEXEC); if (m->console_active_fd < 0) { /* On some systems /dev/tty0 may exist even though /sys/class/tty/tty0 does not. These are broken, but * common. Let's complain but continue anyway. */ if (errno == ENOENT) { log_warning_errno(errno, "System has /dev/tty0 but not /sys/class/tty/tty0/active which is broken, ignoring: %m"); return 0; } return log_error_errno(errno, "Failed to open /sys/class/tty/tty0/active: %m"); } r = sd_event_add_io(m->event, &m->console_active_event_source, m->console_active_fd, 0, manager_dispatch_console, m); if (r < 0) return log_error_errno(r, "Failed to watch foreground console: %m"); /* * SIGRTMIN is used as global VT-release signal, SIGRTMIN + 1 is used * as VT-acquire signal. We ignore any acquire-events (yes, we still * have to provide a valid signal-number for it!) and acknowledge all * release events immediately. */ if (SIGRTMIN + 1 > SIGRTMAX) return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Not enough real-time signals available: %u-%u", SIGRTMIN, SIGRTMAX); assert_se(ignore_signals(SIGRTMIN + 1, -1) >= 0); assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGRTMIN, -1) >= 0); r = sd_event_add_signal(m->event, NULL, SIGRTMIN, manager_vt_switch, m); if (r < 0) return log_error_errno(r, "Failed to subscribe to signal: %m"); return 0; } static int manager_connect_udev(Manager *m) { int r; assert(m); assert(!m->device_seat_monitor); assert(!m->device_monitor); assert(!m->device_vcsa_monitor); assert(!m->device_button_monitor); r = sd_device_monitor_new(&m->device_seat_monitor); if (r < 0) return r; r = sd_device_monitor_filter_add_match_tag(m->device_seat_monitor, "master-of-seat"); if (r < 0) return r; r = sd_device_monitor_attach_event(m->device_seat_monitor, m->event); if (r < 0) return r; r = sd_device_monitor_start(m->device_seat_monitor, manager_dispatch_seat_udev, m); if (r < 0) return r; (void) sd_event_source_set_description(sd_device_monitor_get_event_source(m->device_seat_monitor), "logind-seat-monitor"); r = sd_device_monitor_new(&m->device_monitor); if (r < 0) return r; r = sd_device_monitor_filter_add_match_subsystem_devtype(m->device_monitor, "input", NULL); if (r < 0) return r; r = sd_device_monitor_filter_add_match_subsystem_devtype(m->device_monitor, "graphics", NULL); if (r < 0) return r; r = sd_device_monitor_filter_add_match_subsystem_devtype(m->device_monitor, "drm", NULL); if (r < 0) return r; r = sd_device_monitor_attach_event(m->device_monitor, m->event); if (r < 0) return r; r = sd_device_monitor_start(m->device_monitor, manager_dispatch_device_udev, m); if (r < 0) return r; (void) sd_event_source_set_description(sd_device_monitor_get_event_source(m->device_monitor), "logind-device-monitor"); /* Don't watch keys if nobody cares */ if (!manager_all_buttons_ignored(m)) { r = sd_device_monitor_new(&m->device_button_monitor); if (r < 0) return r; r = sd_device_monitor_filter_add_match_tag(m->device_button_monitor, "power-switch"); if (r < 0) return r; r = sd_device_monitor_filter_add_match_subsystem_devtype(m->device_button_monitor, "input", NULL); if (r < 0) return r; r = sd_device_monitor_attach_event(m->device_button_monitor, m->event); if (r < 0) return r; r = sd_device_monitor_start(m->device_button_monitor, manager_dispatch_button_udev, m); if (r < 0) return r; (void) sd_event_source_set_description(sd_device_monitor_get_event_source(m->device_button_monitor), "logind-button-monitor"); } /* Don't bother watching VCSA devices, if nobody cares */ if (m->n_autovts > 0 && m->console_active_fd >= 0) { r = sd_device_monitor_new(&m->device_vcsa_monitor); if (r < 0) return r; r = sd_device_monitor_filter_add_match_subsystem_devtype(m->device_vcsa_monitor, "vc", NULL); if (r < 0) return r; r = sd_device_monitor_attach_event(m->device_vcsa_monitor, m->event); if (r < 0) return r; r = sd_device_monitor_start(m->device_vcsa_monitor, manager_dispatch_vcsa_udev, m); if (r < 0) return r; (void) sd_event_source_set_description(sd_device_monitor_get_event_source(m->device_vcsa_monitor), "logind-vcsa-monitor"); } return 0; } static void manager_gc(Manager *m, bool drop_not_started) { Seat *seat; Session *session; User *user; assert(m); while ((seat = m->seat_gc_queue)) { LIST_REMOVE(gc_queue, m->seat_gc_queue, seat); seat->in_gc_queue = false; if (seat_may_gc(seat, drop_not_started)) { seat_stop(seat, false); seat_free(seat); } } while ((session = m->session_gc_queue)) { LIST_REMOVE(gc_queue, m->session_gc_queue, session); session->in_gc_queue = false; /* First, if we are not closing yet, initiate stopping */ if (session_may_gc(session, drop_not_started) && session_get_state(session) != SESSION_CLOSING) (void) session_stop(session, false); /* Normally, this should make the session referenced * again, if it doesn't then let's get rid of it * immediately */ if (session_may_gc(session, drop_not_started)) { (void) session_finalize(session); session_free(session); } } while ((user = m->user_gc_queue)) { LIST_REMOVE(gc_queue, m->user_gc_queue, user); user->in_gc_queue = false; /* First step: queue stop jobs */ if (user_may_gc(user, drop_not_started)) (void) user_stop(user, false); /* Second step: finalize user */ if (user_may_gc(user, drop_not_started)) { (void) user_finalize(user); user_free(user); } } } static int manager_dispatch_idle_action(sd_event_source *s, uint64_t t, void *userdata) { Manager *m = userdata; struct dual_timestamp since; usec_t n, elapse; int r; assert(m); if (m->idle_action == HANDLE_IGNORE || m->idle_action_usec <= 0) return 0; n = now(CLOCK_MONOTONIC); r = manager_get_idle_hint(m, &since); if (r <= 0) /* Not idle. Let's check if after a timeout it might be idle then. */ elapse = n + m->idle_action_usec; else { /* Idle! Let's see if it's time to do something, or if * we shall sleep for longer. */ if (n >= since.monotonic + m->idle_action_usec && (m->idle_action_not_before_usec <= 0 || n >= m->idle_action_not_before_usec + m->idle_action_usec)) { log_info("System idle. Doing %s operation.", handle_action_to_string(m->idle_action)); manager_handle_action(m, 0, m->idle_action, false, false); m->idle_action_not_before_usec = n; } elapse = MAX(since.monotonic, m->idle_action_not_before_usec) + m->idle_action_usec; } if (!m->idle_action_event_source) { r = sd_event_add_time( m->event, &m->idle_action_event_source, CLOCK_MONOTONIC, elapse, USEC_PER_SEC*30, manager_dispatch_idle_action, m); if (r < 0) return log_error_errno(r, "Failed to add idle event source: %m"); r = sd_event_source_set_priority(m->idle_action_event_source, SD_EVENT_PRIORITY_IDLE+10); if (r < 0) return log_error_errno(r, "Failed to set idle event source priority: %m"); } else { r = sd_event_source_set_time(m->idle_action_event_source, elapse); if (r < 0) return log_error_errno(r, "Failed to set idle event timer: %m"); r = sd_event_source_set_enabled(m->idle_action_event_source, SD_EVENT_ONESHOT); if (r < 0) return log_error_errno(r, "Failed to enable idle event timer: %m"); } return 0; } static int manager_dispatch_reload_signal(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { Manager *m = userdata; int r; manager_reset_config(m); r = manager_parse_config_file(m); if (r < 0) log_warning_errno(r, "Failed to parse config file, using defaults: %m"); else log_info("Config file reloaded."); return 0; } static int manager_startup(Manager *m) { int r; Seat *seat; Session *session; User *user; Button *button; Inhibitor *inhibitor; Iterator i; assert(m); r = sd_event_add_signal(m->event, NULL, SIGHUP, manager_dispatch_reload_signal, m); if (r < 0) return log_error_errno(r, "Failed to register SIGHUP handler: %m"); /* Connect to utmp */ manager_connect_utmp(m); /* Connect to console */ r = manager_connect_console(m); if (r < 0) return r; /* Connect to udev */ r = manager_connect_udev(m); if (r < 0) return log_error_errno(r, "Failed to create udev watchers: %m"); /* Connect to the bus */ r = manager_connect_bus(m); if (r < 0) return r; /* Instantiate magic seat 0 */ r = manager_add_seat(m, "seat0", &m->seat0); if (r < 0) return log_error_errno(r, "Failed to add seat0: %m"); r = manager_set_lid_switch_ignore(m, 0 + m->holdoff_timeout_usec); if (r < 0) log_warning_errno(r, "Failed to set up lid switch ignore event source: %m"); /* Deserialize state */ r = manager_enumerate_devices(m); if (r < 0) log_warning_errno(r, "Device enumeration failed: %m"); r = manager_enumerate_seats(m); if (r < 0) log_warning_errno(r, "Seat enumeration failed: %m"); r = manager_enumerate_users(m); if (r < 0) log_warning_errno(r, "User enumeration failed: %m"); r = manager_enumerate_sessions(m); if (r < 0) log_warning_errno(r, "Session enumeration failed: %m"); r = manager_enumerate_inhibitors(m); if (r < 0) log_warning_errno(r, "Inhibitor enumeration failed: %m"); r = manager_enumerate_buttons(m); if (r < 0) log_warning_errno(r, "Button enumeration failed: %m"); /* Remove stale objects before we start them */ manager_gc(m, false); /* Reserve the special reserved VT */ manager_reserve_vt(m); /* Read in utmp if it exists */ manager_read_utmp(m); /* And start everything */ HASHMAP_FOREACH(seat, m->seats, i) (void) seat_start(seat); HASHMAP_FOREACH(user, m->users, i) (void) user_start(user); HASHMAP_FOREACH(session, m->sessions, i) (void) session_start(session, NULL, NULL); HASHMAP_FOREACH(inhibitor, m->inhibitors, i) { (void) inhibitor_start(inhibitor); /* Let's see if the inhibitor is dead now, then remove it */ if (inhibitor_is_orphan(inhibitor)) { inhibitor_stop(inhibitor); inhibitor_free(inhibitor); } } HASHMAP_FOREACH(button, m->buttons, i) button_check_switches(button); manager_dispatch_idle_action(NULL, 0, m); return 0; } static int manager_run(Manager *m) { int r; assert(m); for (;;) { r = sd_event_get_state(m->event); if (r < 0) return r; if (r == SD_EVENT_FINISHED) return 0; manager_gc(m, true); r = manager_dispatch_delayed(m, false); if (r < 0) return r; if (r > 0) continue; r = sd_event_run(m->event, (uint64_t) -1); if (r < 0) return r; } } static int run(int argc, char *argv[]) { _cleanup_(manager_unrefp) Manager *m = NULL; int r; log_set_facility(LOG_AUTH); log_setup_service(); umask(0022); if (argc != 1) { log_error("This program takes no arguments."); return -EINVAL; } r = mac_selinux_init(); if (r < 0) return log_error_errno(r, "Could not initialize labelling: %m"); /* Always create the directories people can create inotify watches in. Note that some applications might check * for the existence of /run/systemd/seats/ to determine whether logind is available, so please always make * sure these directories are created early on and unconditionally. */ (void) mkdir_label("/run/systemd/seats", 0755); (void) mkdir_label("/run/systemd/users", 0755); (void) mkdir_label("/run/systemd/sessions", 0755); assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGHUP, SIGTERM, SIGINT, SIGCHLD, -1) >= 0); r = manager_new(&m); if (r < 0) return log_error_errno(r, "Failed to allocate manager object: %m"); (void) manager_parse_config_file(m); r = manager_startup(m); if (r < 0) return log_error_errno(r, "Failed to fully start up daemon: %m"); log_debug("systemd-logind running as pid "PID_FMT, getpid_cached()); (void) sd_notify(false, "READY=1\n" "STATUS=Processing requests..."); r = manager_run(m); log_debug("systemd-logind stopped as pid "PID_FMT, getpid_cached()); (void) sd_notify(false, "STOPPING=1\n" "STATUS=Shutting down..."); return r; } DEFINE_MAIN_FUNCTION(run);