/* SPDX-License-Identifier: LGPL-2.1+ */ /*** This file is part of systemd. Copyright 2011 Lennart Poettering ***/ #include #include #include #include #include "libudev.h" #include "sd-daemon.h" #include "alloc-util.h" #include "bus-error.h" #include "bus-util.h" #include "cgroup-util.h" #include "conf-parser.h" #include "def.h" #include "dirent-util.h" #include "fd-util.h" #include "format-util.h" #include "fs-util.h" #include "logind.h" #include "parse-util.h" #include "process-util.h" #include "selinux-util.h" #include "signal-util.h" #include "strv.h" #include "udev-util.h" static void manager_free(Manager *m); static void manager_reset_config(Manager *m) { m->n_autovts = 6; m->reserve_vt = 6; m->remove_ipc = true; m->inhibit_delay_max = 5 * USEC_PER_SEC; m->handle_power_key = HANDLE_POWEROFF; m->handle_suspend_key = HANDLE_SUSPEND; m->handle_hibernate_key = HANDLE_HIBERNATE; m->handle_lid_switch = HANDLE_SUSPEND; m->handle_lid_switch_ep = _HANDLE_ACTION_INVALID; m->handle_lid_switch_docked = HANDLE_IGNORE; m->power_key_ignore_inhibited = false; m->suspend_key_ignore_inhibited = false; m->hibernate_key_ignore_inhibited = false; m->lid_switch_ignore_inhibited = true; m->holdoff_timeout_usec = 30 * USEC_PER_SEC; m->idle_action_usec = 30 * USEC_PER_MINUTE; m->idle_action = HANDLE_IGNORE; m->runtime_dir_size = physical_memory_scale(10U, 100U); /* 10% */ m->user_tasks_max = system_tasks_max_scale(DEFAULT_USER_TASKS_MAX_PERCENTAGE, 100U); /* 33% */ m->sessions_max = 8192; m->inhibitors_max = 8192; m->kill_user_processes = KILL_USER_PROCESSES; m->kill_only_users = strv_free(m->kill_only_users); m->kill_exclude_users = strv_free(m->kill_exclude_users); } static Manager *manager_new(void) { Manager *m; int r; m = new0(Manager, 1); if (!m) return NULL; m->console_active_fd = -1; m->reserve_vt_fd = -1; m->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->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->users || !m->inhibitors || !m->buttons || !m->user_units || !m->session_units) goto fail; m->udev = udev_new(); if (!m->udev) goto fail; r = sd_event_default(&m->event); if (r < 0) goto fail; sd_event_set_watchdog(m->event, true); manager_reset_config(m); return m; fail: manager_free(m); return NULL; } static void manager_free(Manager *m) { Session *session; User *u; Device *d; Seat *s; Inhibitor *i; Button *b; if (!m) return; 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->users); hashmap_free(m->inhibitors); hashmap_free(m->buttons); 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->udev_seat_event_source); sd_event_source_unref(m->udev_device_event_source); sd_event_source_unref(m->udev_vcsa_event_source); sd_event_source_unref(m->udev_button_event_source); sd_event_source_unref(m->lid_switch_ignore_event_source); safe_close(m->console_active_fd); udev_monitor_unref(m->udev_seat_monitor); udev_monitor_unref(m->udev_device_monitor); udev_monitor_unref(m->udev_vcsa_monitor); udev_monitor_unref(m->udev_button_monitor); udev_unref(m->udev); if (m->unlink_nologin) (void) unlink_or_warn("/run/nologin"); bus_verify_polkit_async_registry_free(m->polkit_registry); sd_bus_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); free(m); } static int manager_enumerate_devices(Manager *m) { struct udev_list_entry *item = NULL, *first = NULL; _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL; int r; assert(m); /* Loads devices from udev and creates seats for them as * necessary */ e = udev_enumerate_new(m->udev); if (!e) return -ENOMEM; r = udev_enumerate_add_match_tag(e, "master-of-seat"); if (r < 0) return r; r = udev_enumerate_add_match_is_initialized(e); if (r < 0) return r; r = udev_enumerate_scan_devices(e); if (r < 0) return r; first = udev_enumerate_get_list_entry(e); udev_list_entry_foreach(item, first) { _cleanup_udev_device_unref_ struct udev_device *d = NULL; int k; d = udev_device_new_from_syspath(m->udev, udev_list_entry_get_name(item)); if (!d) return -ENOMEM; k = manager_process_seat_device(m, d); if (k < 0) r = k; } return r; } static int manager_enumerate_buttons(Manager *m) { _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL; struct udev_list_entry *item = NULL, *first = NULL; int r; assert(m); /* Loads buttons from udev */ if (manager_all_buttons_ignored(m)) return 0; e = udev_enumerate_new(m->udev); if (!e) return -ENOMEM; r = udev_enumerate_add_match_subsystem(e, "input"); if (r < 0) return r; r = udev_enumerate_add_match_tag(e, "power-switch"); if (r < 0) return r; r = udev_enumerate_add_match_is_initialized(e); if (r < 0) return r; r = udev_enumerate_scan_devices(e); if (r < 0) return r; first = udev_enumerate_get_list_entry(e); udev_list_entry_foreach(item, first) { _cleanup_udev_device_unref_ struct udev_device *d = NULL; int k; d = udev_device_new_from_syspath(m->udev, udev_list_entry_get_name(item)); if (!d) return -ENOMEM; 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) { log_notice_errno(k, "Couldn't add lingering user %s: %m", de->d_name); r = k; } } 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) { log_error_errno(k, "Failed to add user by file name %s: %m", de->d_name); r = k; 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 int 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) || safe_atou(parts[4], &minor); if (r < 0) return r; *dev = makedev(major, minor); *session_id = TAKE_PTR(id); return 0; } static int manager_attach_fds(Manager *m) { _cleanup_strv_free_ char **fdnames = NULL; int n, i, fd; /* 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 n; for (i = 0; i < n; i++) { _cleanup_free_ char *id = NULL; dev_t dev; struct stat st; SessionDevice *sd; Session *s; int r; fd = SD_LISTEN_FDS_START + i; r = parse_fdname(fdnames[i], &id, &dev); if (r < 0) { log_debug_errno(r, "Failed to parse fd name %s: %m", fdnames[i]); close_nointr(fd); continue; } 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. */ log_debug("Failed to attach fd for unknown session: %s", id); close_nointr(fd); continue; } if (fstat(fd, &st) < 0) { /* The device is allowed to go away at a random point, in which * case fstat failing is expected. */ log_debug_errno(errno, "Failed to stat device fd for session %s: %m", id); close_nointr(fd); continue; } if (!S_ISCHR(st.st_mode) || st.st_rdev != dev) { log_debug("Device fd doesn't point to the expected character device node"); close_nointr(fd); continue; } 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... */ log_warning("Got fd for missing session device [%u:%u] in session %s", major(dev), minor(dev), s->id); close_nointr(fd); continue; } 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_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; if (!session_id_valid(de->d_name)) { log_warning("Invalid session file name '%s', ignoring.", de->d_name); r = -EINVAL; continue; } k = manager_add_session(m, de->d_name, &s); if (k < 0) { log_error_errno(k, "Failed to add session by file name %s: %m", de->d_name); r = k; 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. */ k = manager_attach_fds(m); if (k < 0) log_warning_errno(k, "Failed to reattach session device 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) { log_notice_errno(k, "Couldn't add inhibitor %s: %m", de->d_name); r = k; continue; } k = inhibitor_load(i); if (k < 0) r = k; } return r; } static int manager_dispatch_seat_udev(sd_event_source *s, int fd, uint32_t revents, void *userdata) { _cleanup_udev_device_unref_ struct udev_device *d = NULL; Manager *m = userdata; assert(m); d = udev_monitor_receive_device(m->udev_seat_monitor); if (!d) return -ENOMEM; manager_process_seat_device(m, d); return 0; } static int manager_dispatch_device_udev(sd_event_source *s, int fd, uint32_t revents, void *userdata) { _cleanup_udev_device_unref_ struct udev_device *d = NULL; Manager *m = userdata; assert(m); d = udev_monitor_receive_device(m->udev_device_monitor); if (!d) return -ENOMEM; manager_process_seat_device(m, d); return 0; } static int manager_dispatch_vcsa_udev(sd_event_source *s, int fd, uint32_t revents, void *userdata) { _cleanup_udev_device_unref_ struct udev_device *d = NULL; Manager *m = userdata; const char *name; assert(m); d = udev_monitor_receive_device(m->udev_vcsa_monitor); if (!d) return -ENOMEM; name = udev_device_get_sysname(d); /* Whenever a VCSA device is removed try to reallocate our * VTs, to make sure our auto VTs never go away. */ if (name && startswith(name, "vcsa") && streq_ptr(udev_device_get_action(d), "remove")) seat_preallocate_vts(m->seat0); return 0; } static int manager_dispatch_button_udev(sd_event_source *s, int fd, uint32_t revents, void *userdata) { _cleanup_udev_device_unref_ struct udev_device *d = NULL; Manager *m = userdata; assert(m); d = udev_monitor_receive_device(m->udev_button_monitor); if (!d) return -ENOMEM; manager_process_button_device(m, d); 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) { log_warning("Received VT_PROCESS signal without a registered session on that VT."); 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 architectures (S390 and Xen, and containers), /dev/tty0 does not exist, 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 the device node /dev/tty0 may exist * even though /sys/class/tty/tty0 does not. */ if (errno == ENOENT) 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) { log_error("Failed to watch foreground console"); return r; } /* * 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) { log_error("Not enough real-time signals available: %u-%u", SIGRTMIN, SIGRTMAX); return -EINVAL; } 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 r; return 0; } static int manager_connect_udev(Manager *m) { int r; assert(m); assert(!m->udev_seat_monitor); assert(!m->udev_device_monitor); assert(!m->udev_vcsa_monitor); assert(!m->udev_button_monitor); m->udev_seat_monitor = udev_monitor_new_from_netlink(m->udev, "udev"); if (!m->udev_seat_monitor) return -ENOMEM; r = udev_monitor_filter_add_match_tag(m->udev_seat_monitor, "master-of-seat"); if (r < 0) return r; r = udev_monitor_enable_receiving(m->udev_seat_monitor); if (r < 0) return r; r = sd_event_add_io(m->event, &m->udev_seat_event_source, udev_monitor_get_fd(m->udev_seat_monitor), EPOLLIN, manager_dispatch_seat_udev, m); if (r < 0) return r; m->udev_device_monitor = udev_monitor_new_from_netlink(m->udev, "udev"); if (!m->udev_device_monitor) return -ENOMEM; r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_device_monitor, "input", NULL); if (r < 0) return r; r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_device_monitor, "graphics", NULL); if (r < 0) return r; r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_device_monitor, "drm", NULL); if (r < 0) return r; r = udev_monitor_enable_receiving(m->udev_device_monitor); if (r < 0) return r; r = sd_event_add_io(m->event, &m->udev_device_event_source, udev_monitor_get_fd(m->udev_device_monitor), EPOLLIN, manager_dispatch_device_udev, m); if (r < 0) return r; /* Don't watch keys if nobody cares */ if (!manager_all_buttons_ignored(m)) { m->udev_button_monitor = udev_monitor_new_from_netlink(m->udev, "udev"); if (!m->udev_button_monitor) return -ENOMEM; r = udev_monitor_filter_add_match_tag(m->udev_button_monitor, "power-switch"); if (r < 0) return r; r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_button_monitor, "input", NULL); if (r < 0) return r; r = udev_monitor_enable_receiving(m->udev_button_monitor); if (r < 0) return r; r = sd_event_add_io(m->event, &m->udev_button_event_source, udev_monitor_get_fd(m->udev_button_monitor), EPOLLIN, manager_dispatch_button_udev, m); if (r < 0) return r; } /* Don't bother watching VCSA devices, if nobody cares */ if (m->n_autovts > 0 && m->console_active_fd >= 0) { m->udev_vcsa_monitor = udev_monitor_new_from_netlink(m->udev, "udev"); if (!m->udev_vcsa_monitor) return -ENOMEM; r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_vcsa_monitor, "vc", NULL); if (r < 0) return r; r = udev_monitor_enable_receiving(m->udev_vcsa_monitor); if (r < 0) return r; r = sd_event_add_io(m->event, &m->udev_vcsa_event_source, udev_monitor_get_fd(m->udev_vcsa_monitor), EPOLLIN, manager_dispatch_vcsa_udev, m); if (r < 0) return r; } 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) 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)) { 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)) user_stop(user, false); /* Second step: finalize user */ if (user_may_gc(user, drop_not_started)) { 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. Taking 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_parse_config_file(Manager *m) { assert(m); return config_parse_many_nulstr(PKGSYSCONFDIR "/logind.conf", CONF_PATHS_NULSTR("systemd/logind.conf.d"), "Login\0", config_item_perf_lookup, logind_gperf_lookup, CONFIG_PARSE_WARN, m); } 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); assert_se(sigprocmask_many(SIG_SETMASK, NULL, SIGHUP, -1) >= 0); 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 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); /* And start everything */ HASHMAP_FOREACH(seat, m->seats, i) seat_start(seat); HASHMAP_FOREACH(user, m->users, i) user_start(user); HASHMAP_FOREACH(session, m->sessions, i) session_start(session); HASHMAP_FOREACH(inhibitor, m->inhibitors, i) inhibitor_start(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; } } int main(int argc, char *argv[]) { Manager *m = NULL; int r; log_set_target(LOG_TARGET_AUTO); log_set_facility(LOG_AUTH); log_parse_environment(); log_open(); umask(0022); if (argc != 1) { log_error("This program takes no arguments."); r = -EINVAL; goto finish; } r = mac_selinux_init(); if (r < 0) { log_error_errno(r, "Could not initialize labelling: %m"); goto finish; } /* 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 this check * stays in. */ mkdir_label("/run/systemd/seats", 0755); mkdir_label("/run/systemd/users", 0755); mkdir_label("/run/systemd/sessions", 0755); m = manager_new(); if (!m) { r = log_oom(); goto finish; } manager_parse_config_file(m); r = manager_startup(m); if (r < 0) { log_error_errno(r, "Failed to fully start up daemon: %m"); goto finish; } log_debug("systemd-logind running as pid "PID_FMT, getpid_cached()); sd_notify(false, "READY=1\n" "STATUS=Processing requests..."); r = manager_run(m); log_debug("systemd-logind stopped as pid "PID_FMT, getpid_cached()); finish: sd_notify(false, "STOPPING=1\n" "STATUS=Shutting down..."); manager_free(m); return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; }