diff options
Diffstat (limited to '')
-rw-r--r-- | src/login/logind.c | 1245 | ||||
-rw-r--r-- | src/login/logind.conf.in | 37 |
2 files changed, 1282 insertions, 0 deletions
diff --git a/src/login/logind.c b/src/login/logind.c new file mode 100644 index 0000000..95ec0a5 --- /dev/null +++ b/src/login/logind.c @@ -0,0 +1,1245 @@ +/* SPDX-License-Identifier: LGPL-2.1+ */ + +#include <errno.h> +#include <fcntl.h> +#include <string.h> +#include <unistd.h> + +#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.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" + +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, + }; + + 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->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->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) { + 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 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 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_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, *action; + + 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") && + sd_device_get_property_value(device, "ACTION", &action) >= 0 && + streq(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. 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_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) + 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; + } +} + +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, -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); diff --git a/src/login/logind.conf.in b/src/login/logind.conf.in new file mode 100644 index 0000000..1029e29 --- /dev/null +++ b/src/login/logind.conf.in @@ -0,0 +1,37 @@ +# This file is part of systemd. +# +# 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. +# +# Entries in this file show the compile time defaults. +# You can change settings by editing this file. +# Defaults can be restored by simply deleting this file. +# +# See logind.conf(5) for details. + +[Login] +#NAutoVTs=6 +#ReserveVT=6 +#KillUserProcesses=@KILL_USER_PROCESSES@ +#KillOnlyUsers= +#KillExcludeUsers=root +#InhibitDelayMaxSec=5 +#HandlePowerKey=poweroff +#HandleSuspendKey=suspend +#HandleHibernateKey=hibernate +#HandleLidSwitch=suspend +#HandleLidSwitchExternalPower=suspend +#HandleLidSwitchDocked=ignore +#PowerKeyIgnoreInhibited=no +#SuspendKeyIgnoreInhibited=no +#HibernateKeyIgnoreInhibited=no +#LidSwitchIgnoreInhibited=yes +#HoldoffTimeoutSec=30s +#IdleAction=ignore +#IdleActionSec=30min +#RuntimeDirectorySize=10% +#RemoveIPC=yes +#InhibitorsMax=8192 +#SessionsMax=8192 |