diff options
Diffstat (limited to 'src/grp-login/systemd-logind/logind.c')
| -rw-r--r-- | src/grp-login/systemd-logind/logind.c | 1211 |
1 files changed, 1211 insertions, 0 deletions
diff --git a/src/grp-login/systemd-logind/logind.c b/src/grp-login/systemd-logind/logind.c new file mode 100644 index 0000000000..c95a11f9ea --- /dev/null +++ b/src/grp-login/systemd-logind/logind.c @@ -0,0 +1,1211 @@ +/*** + This file is part of systemd. + + Copyright 2011 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <errno.h> +#include <fcntl.h> +#include <string.h> +#include <unistd.h> + +#include <libudev.h> +#include <systemd/sd-daemon.h> + +#include "sd-bus/bus-error.h" +#include "sd-bus/bus-util.h" +#include "systemd-basic/alloc-util.h" +#include "systemd-basic/cgroup-util.h" +#include "systemd-basic/def.h" +#include "systemd-basic/dirent-util.h" +#include "systemd-basic/fd-util.h" +#include "systemd-basic/formats-util.h" +#include "systemd-basic/selinux-util.h" +#include "systemd-basic/signal-util.h" +#include "systemd-basic/strv.h" +#include "systemd-shared/conf-parser.h" +#include "systemd-shared/udev-util.h" + +#include "logind.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_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("/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 (m->handle_power_key == HANDLE_IGNORE && + m->handle_suspend_key == HANDLE_IGNORE && + m->handle_hibernate_key == HANDLE_IGNORE && + m->handle_lid_switch == HANDLE_IGNORE && + m->handle_lid_switch_docked == HANDLE_IGNORE) + 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) { + unlinkat(dirfd(d), de->d_name, 0); + 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 manager_enumerate_sessions(Manager *m) { + _cleanup_closedir_ DIR *d = NULL; + struct dirent *de; + int r = 0; + + 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; + int k; + + 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; + } + + 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) { + _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; + 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_add_match(m->bus, + NULL, + "type='signal'," + "sender='org.freedesktop.systemd1'," + "interface='org.freedesktop.systemd1.Manager'," + "member='JobRemoved'," + "path='/org/freedesktop/systemd1'", + match_job_removed, m); + if (r < 0) + return log_error_errno(r, "Failed to add match for JobRemoved: %m"); + + r = sd_bus_add_match(m->bus, + NULL, + "type='signal'," + "sender='org.freedesktop.systemd1'," + "interface='org.freedesktop.systemd1.Manager'," + "member='UnitRemoved'," + "path='/org/freedesktop/systemd1'", + match_unit_removed, m); + if (r < 0) + return log_error_errno(r, "Failed to add match for UnitRemoved: %m"); + + r = sd_bus_add_match(m->bus, + NULL, + "type='signal'," + "sender='org.freedesktop.systemd1'," + "interface='org.freedesktop.DBus.Properties'," + "member='PropertiesChanged'", + match_properties_changed, m); + if (r < 0) + return log_error_errno(r, "Failed to add match for PropertiesChanged: %m"); + + r = sd_bus_add_match(m->bus, + NULL, + "type='signal'," + "sender='org.freedesktop.systemd1'," + "interface='org.freedesktop.systemd1.Manager'," + "member='Reloading'," + "path='/org/freedesktop/systemd1'", + match_reloading, m); + if (r < 0) + return log_error_errno(r, "Failed to add match for Reloading: %m"); + + r = sd_bus_call_method( + m->bus, + "org.freedesktop.systemd1", + "/org/freedesktop/systemd1", + "org.freedesktop.systemd1.Manager", + "Subscribe", + &error, + NULL, NULL); + if (r < 0) { + log_error("Failed to enable subscription: %s", bus_error_message(&error, r)); + return r; + } + + r = sd_bus_request_name(m->bus, "org.freedesktop.login1", 0); + if (r < 0) + return log_error_errno(r, "Failed to register 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 (m->handle_power_key != HANDLE_IGNORE || + m->handle_suspend_key != HANDLE_IGNORE || + m->handle_hibernate_key != HANDLE_IGNORE || + m->handle_lid_switch != HANDLE_IGNORE || + m->handle_lid_switch_docked != HANDLE_IGNORE) { + + 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_check_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_check_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_check_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_check_gc(user, drop_not_started)) + user_stop(user, false); + + /* Second step: finalize user */ + if (!user_check_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, + false, 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()); + + sd_notify(false, + "READY=1\n" + "STATUS=Processing requests..."); + + r = manager_run(m); + + log_debug("systemd-logind stopped as pid "PID_FMT, getpid()); + +finish: + sd_notify(false, + "STOPPING=1\n" + "STATUS=Shutting down..."); + + manager_free(m); + + return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; +} |