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[thirdparty/systemd.git] / src / login / logind.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2
3 #include <errno.h>
4 #include <fcntl.h>
5 #include <sys/types.h>
6 #include <unistd.h>
7
8 #include "sd-daemon.h"
9 #include "sd-device.h"
10
11 #include "alloc-util.h"
12 #include "bus-error.h"
13 #include "bus-locator.h"
14 #include "bus-log-control-api.h"
15 #include "bus-polkit.h"
16 #include "cgroup-util.h"
17 #include "def.h"
18 #include "device-util.h"
19 #include "dirent-util.h"
20 #include "fd-util.h"
21 #include "format-util.h"
22 #include "fs-util.h"
23 #include "logind-dbus.h"
24 #include "logind-seat-dbus.h"
25 #include "logind-session-dbus.h"
26 #include "logind-user-dbus.h"
27 #include "logind.h"
28 #include "main-func.h"
29 #include "parse-util.h"
30 #include "process-util.h"
31 #include "selinux-util.h"
32 #include "service-util.h"
33 #include "signal-util.h"
34 #include "strv.h"
35 #include "terminal-util.h"
36 #include "udev-util.h"
37 #include "user-util.h"
38
39 static Manager* manager_unref(Manager *m);
40 DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_unref);
41
42 static int manager_new(Manager **ret) {
43 _cleanup_(manager_unrefp) Manager *m = NULL;
44 int r;
45
46 assert(ret);
47
48 m = new(Manager, 1);
49 if (!m)
50 return -ENOMEM;
51
52 *m = (Manager) {
53 .console_active_fd = -1,
54 .reserve_vt_fd = -1,
55 .idle_action_not_before_usec = now(CLOCK_MONOTONIC),
56 };
57
58 m->devices = hashmap_new(&string_hash_ops);
59 m->seats = hashmap_new(&string_hash_ops);
60 m->sessions = hashmap_new(&string_hash_ops);
61 m->sessions_by_leader = hashmap_new(NULL);
62 m->users = hashmap_new(NULL);
63 m->inhibitors = hashmap_new(&string_hash_ops);
64 m->buttons = hashmap_new(&string_hash_ops);
65
66 m->user_units = hashmap_new(&string_hash_ops);
67 m->session_units = hashmap_new(&string_hash_ops);
68
69 if (!m->devices || !m->seats || !m->sessions || !m->sessions_by_leader || !m->users || !m->inhibitors || !m->buttons || !m->user_units || !m->session_units)
70 return -ENOMEM;
71
72 r = sd_event_default(&m->event);
73 if (r < 0)
74 return r;
75
76 r = sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL);
77 if (r < 0)
78 return r;
79
80 r = sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL);
81 if (r < 0)
82 return r;
83
84 (void) sd_event_set_watchdog(m->event, true);
85
86 manager_reset_config(m);
87
88 *ret = TAKE_PTR(m);
89 return 0;
90 }
91
92 static Manager* manager_unref(Manager *m) {
93 Session *session;
94 User *u;
95 Device *d;
96 Seat *s;
97 Inhibitor *i;
98 Button *b;
99
100 if (!m)
101 return NULL;
102
103 while ((session = hashmap_first(m->sessions)))
104 session_free(session);
105
106 while ((u = hashmap_first(m->users)))
107 user_free(u);
108
109 while ((d = hashmap_first(m->devices)))
110 device_free(d);
111
112 while ((s = hashmap_first(m->seats)))
113 seat_free(s);
114
115 while ((i = hashmap_first(m->inhibitors)))
116 inhibitor_free(i);
117
118 while ((b = hashmap_first(m->buttons)))
119 button_free(b);
120
121 hashmap_free(m->devices);
122 hashmap_free(m->seats);
123 hashmap_free(m->sessions);
124 hashmap_free(m->sessions_by_leader);
125 hashmap_free(m->users);
126 hashmap_free(m->inhibitors);
127 hashmap_free(m->buttons);
128 hashmap_free(m->brightness_writers);
129
130 hashmap_free(m->user_units);
131 hashmap_free(m->session_units);
132
133 sd_event_source_unref(m->idle_action_event_source);
134 sd_event_source_unref(m->inhibit_timeout_source);
135 sd_event_source_unref(m->scheduled_shutdown_timeout_source);
136 sd_event_source_unref(m->nologin_timeout_source);
137 sd_event_source_unref(m->wall_message_timeout_source);
138
139 sd_event_source_unref(m->console_active_event_source);
140 sd_event_source_unref(m->lid_switch_ignore_event_source);
141
142 #if ENABLE_UTMP
143 sd_event_source_unref(m->utmp_event_source);
144 #endif
145
146 safe_close(m->console_active_fd);
147
148 sd_device_monitor_unref(m->device_seat_monitor);
149 sd_device_monitor_unref(m->device_monitor);
150 sd_device_monitor_unref(m->device_vcsa_monitor);
151 sd_device_monitor_unref(m->device_button_monitor);
152
153 if (m->unlink_nologin)
154 (void) unlink_or_warn("/run/nologin");
155
156 bus_verify_polkit_async_registry_free(m->polkit_registry);
157
158 sd_bus_flush_close_unref(m->bus);
159 sd_event_unref(m->event);
160
161 safe_close(m->reserve_vt_fd);
162
163 strv_free(m->kill_only_users);
164 strv_free(m->kill_exclude_users);
165
166 free(m->scheduled_shutdown_type);
167 free(m->scheduled_shutdown_tty);
168 free(m->wall_message);
169 free(m->action_job);
170
171 strv_free(m->efi_boot_loader_entries);
172 free(m->efi_loader_entry_one_shot);
173
174 return mfree(m);
175 }
176
177 static int manager_enumerate_devices(Manager *m) {
178 _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
179 sd_device *d;
180 int r;
181
182 assert(m);
183
184 /* Loads devices from udev and creates seats for them as
185 * necessary */
186
187 r = sd_device_enumerator_new(&e);
188 if (r < 0)
189 return r;
190
191 r = sd_device_enumerator_add_match_tag(e, "master-of-seat");
192 if (r < 0)
193 return r;
194
195 FOREACH_DEVICE(e, d) {
196 int k;
197
198 k = manager_process_seat_device(m, d);
199 if (k < 0)
200 r = k;
201 }
202
203 return r;
204 }
205
206 static int manager_enumerate_buttons(Manager *m) {
207 _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
208 sd_device *d;
209 int r;
210
211 assert(m);
212
213 /* Loads buttons from udev */
214
215 if (manager_all_buttons_ignored(m))
216 return 0;
217
218 r = sd_device_enumerator_new(&e);
219 if (r < 0)
220 return r;
221
222 r = sd_device_enumerator_add_match_subsystem(e, "input", true);
223 if (r < 0)
224 return r;
225
226 r = sd_device_enumerator_add_match_tag(e, "power-switch");
227 if (r < 0)
228 return r;
229
230 FOREACH_DEVICE(e, d) {
231 int k;
232
233 k = manager_process_button_device(m, d);
234 if (k < 0)
235 r = k;
236 }
237
238 return r;
239 }
240
241 static int manager_enumerate_seats(Manager *m) {
242 _cleanup_closedir_ DIR *d = NULL;
243 struct dirent *de;
244 int r = 0;
245
246 assert(m);
247
248 /* This loads data about seats stored on disk, but does not
249 * actually create any seats. Removes data of seats that no
250 * longer exist. */
251
252 d = opendir("/run/systemd/seats");
253 if (!d) {
254 if (errno == ENOENT)
255 return 0;
256
257 return log_error_errno(errno, "Failed to open /run/systemd/seats: %m");
258 }
259
260 FOREACH_DIRENT(de, d, return -errno) {
261 Seat *s;
262 int k;
263
264 if (!dirent_is_file(de))
265 continue;
266
267 s = hashmap_get(m->seats, de->d_name);
268 if (!s) {
269 if (unlinkat(dirfd(d), de->d_name, 0) < 0)
270 log_warning("Failed to remove /run/systemd/seats/%s: %m",
271 de->d_name);
272 continue;
273 }
274
275 k = seat_load(s);
276 if (k < 0)
277 r = k;
278 }
279
280 return r;
281 }
282
283 static int manager_enumerate_linger_users(Manager *m) {
284 _cleanup_closedir_ DIR *d = NULL;
285 struct dirent *de;
286 int r = 0;
287
288 assert(m);
289
290 d = opendir("/var/lib/systemd/linger");
291 if (!d) {
292 if (errno == ENOENT)
293 return 0;
294
295 return log_error_errno(errno, "Failed to open /var/lib/systemd/linger/: %m");
296 }
297
298 FOREACH_DIRENT(de, d, return -errno) {
299 int k;
300
301 dirent_ensure_type(d, de);
302 if (!dirent_is_file(de))
303 continue;
304
305 k = manager_add_user_by_name(m, de->d_name, NULL);
306 if (k < 0)
307 r = log_warning_errno(k, "Couldn't add lingering user %s, ignoring: %m", de->d_name);
308 }
309
310 return r;
311 }
312
313 static int manager_enumerate_users(Manager *m) {
314 _cleanup_closedir_ DIR *d = NULL;
315 struct dirent *de;
316 int r, k;
317
318 assert(m);
319
320 /* Add lingering users */
321 r = manager_enumerate_linger_users(m);
322
323 /* Read in user data stored on disk */
324 d = opendir("/run/systemd/users");
325 if (!d) {
326 if (errno == ENOENT)
327 return 0;
328
329 return log_error_errno(errno, "Failed to open /run/systemd/users: %m");
330 }
331
332 FOREACH_DIRENT(de, d, return -errno) {
333 User *u;
334 uid_t uid;
335
336 if (!dirent_is_file(de))
337 continue;
338
339 k = parse_uid(de->d_name, &uid);
340 if (k < 0) {
341 r = log_warning_errno(k, "Failed to parse filename /run/systemd/users/%s as UID.", de->d_name);
342 continue;
343 }
344
345 k = manager_add_user_by_uid(m, uid, &u);
346 if (k < 0) {
347 r = log_warning_errno(k, "Failed to add user by file name %s, ignoring: %m", de->d_name);
348 continue;
349 }
350
351 user_add_to_gc_queue(u);
352
353 k = user_load(u);
354 if (k < 0)
355 r = k;
356 }
357
358 return r;
359 }
360
361 static int parse_fdname(const char *fdname, char **session_id, dev_t *dev) {
362 _cleanup_strv_free_ char **parts = NULL;
363 _cleanup_free_ char *id = NULL;
364 unsigned major, minor;
365 int r;
366
367 parts = strv_split(fdname, "-");
368 if (!parts)
369 return -ENOMEM;
370 if (strv_length(parts) != 5)
371 return -EINVAL;
372
373 if (!streq(parts[0], "session"))
374 return -EINVAL;
375
376 id = strdup(parts[1]);
377 if (!id)
378 return -ENOMEM;
379
380 if (!streq(parts[2], "device"))
381 return -EINVAL;
382
383 r = safe_atou(parts[3], &major);
384 if (r < 0)
385 return r;
386 r = safe_atou(parts[4], &minor);
387 if (r < 0)
388 return r;
389
390 *dev = makedev(major, minor);
391 *session_id = TAKE_PTR(id);
392
393 return 0;
394 }
395
396 static int deliver_fd(Manager *m, const char *fdname, int fd) {
397 _cleanup_free_ char *id = NULL;
398 SessionDevice *sd;
399 struct stat st;
400 Session *s;
401 dev_t dev;
402 int r;
403
404 assert(m);
405 assert(fd >= 0);
406
407 r = parse_fdname(fdname, &id, &dev);
408 if (r < 0)
409 return log_debug_errno(r, "Failed to parse fd name %s: %m", fdname);
410
411 s = hashmap_get(m->sessions, id);
412 if (!s)
413 /* If the session doesn't exist anymore, the associated session device attached to this fd
414 * doesn't either. Let's simply close this fd. */
415 return log_debug_errno(SYNTHETIC_ERRNO(ENXIO), "Failed to attach fd for unknown session: %s", id);
416
417 if (fstat(fd, &st) < 0)
418 /* The device is allowed to go away at a random point, in which case fstat() failing is
419 * expected. */
420 return log_debug_errno(errno, "Failed to stat device fd for session %s: %m", id);
421
422 if (!S_ISCHR(st.st_mode) || st.st_rdev != dev)
423 return log_debug_errno(SYNTHETIC_ERRNO(ENODEV), "Device fd doesn't point to the expected character device node");
424
425 sd = hashmap_get(s->devices, &dev);
426 if (!sd)
427 /* Weird, we got an fd for a session device which wasn't recorded in the session state
428 * file... */
429 return log_warning_errno(SYNTHETIC_ERRNO(ENODEV), "Got fd for missing session device [%u:%u] in session %s",
430 major(dev), minor(dev), s->id);
431
432 log_debug("Attaching fd to session device [%u:%u] for session %s",
433 major(dev), minor(dev), s->id);
434
435 session_device_attach_fd(sd, fd, s->was_active);
436 return 0;
437 }
438
439 static int manager_attach_fds(Manager *m) {
440 _cleanup_strv_free_ char **fdnames = NULL;
441 int n;
442
443 /* Upon restart, PID1 will send us back all fds of session devices that we previously opened. Each
444 * file descriptor is associated with a given session. The session ids are passed through FDNAMES. */
445
446 n = sd_listen_fds_with_names(true, &fdnames);
447 if (n < 0)
448 return log_warning_errno(n, "Failed to acquire passed fd list: %m");
449 if (n == 0)
450 return 0;
451
452 for (int i = 0; i < n; i++) {
453 int fd = SD_LISTEN_FDS_START + i;
454
455 if (deliver_fd(m, fdnames[i], fd) >= 0)
456 continue;
457
458 /* Hmm, we couldn't deliver the fd to any session device object? If so, let's close the fd */
459 safe_close(fd);
460
461 /* Remove from fdstore as well */
462 (void) sd_notifyf(false,
463 "FDSTOREREMOVE=1\n"
464 "FDNAME=%s", fdnames[i]);
465 }
466
467 return 0;
468 }
469
470 static int manager_enumerate_sessions(Manager *m) {
471 _cleanup_closedir_ DIR *d = NULL;
472 struct dirent *de;
473 int r = 0, k;
474
475 assert(m);
476
477 /* Read in session data stored on disk */
478 d = opendir("/run/systemd/sessions");
479 if (!d) {
480 if (errno == ENOENT)
481 return 0;
482
483 return log_error_errno(errno, "Failed to open /run/systemd/sessions: %m");
484 }
485
486 FOREACH_DIRENT(de, d, return -errno) {
487 struct Session *s;
488
489 if (!dirent_is_file(de))
490 continue;
491
492 k = manager_add_session(m, de->d_name, &s);
493 if (k < 0) {
494 r = log_warning_errno(k, "Failed to add session by file name %s, ignoring: %m", de->d_name);
495 continue;
496 }
497
498 session_add_to_gc_queue(s);
499
500 k = session_load(s);
501 if (k < 0)
502 r = k;
503 }
504
505 /* We might be restarted and PID1 could have sent us back the session device fds we previously
506 * saved. */
507 (void) manager_attach_fds(m);
508
509 return r;
510 }
511
512 static int manager_enumerate_inhibitors(Manager *m) {
513 _cleanup_closedir_ DIR *d = NULL;
514 struct dirent *de;
515 int r = 0;
516
517 assert(m);
518
519 d = opendir("/run/systemd/inhibit");
520 if (!d) {
521 if (errno == ENOENT)
522 return 0;
523
524 return log_error_errno(errno, "Failed to open /run/systemd/inhibit: %m");
525 }
526
527 FOREACH_DIRENT(de, d, return -errno) {
528 int k;
529 Inhibitor *i;
530
531 if (!dirent_is_file(de))
532 continue;
533
534 k = manager_add_inhibitor(m, de->d_name, &i);
535 if (k < 0) {
536 r = log_warning_errno(k, "Couldn't add inhibitor %s, ignoring: %m", de->d_name);
537 continue;
538 }
539
540 k = inhibitor_load(i);
541 if (k < 0)
542 r = k;
543 }
544
545 return r;
546 }
547
548 static int manager_dispatch_seat_udev(sd_device_monitor *monitor, sd_device *device, void *userdata) {
549 Manager *m = userdata;
550
551 assert(m);
552 assert(device);
553
554 manager_process_seat_device(m, device);
555 return 0;
556 }
557
558 static int manager_dispatch_device_udev(sd_device_monitor *monitor, sd_device *device, void *userdata) {
559 Manager *m = userdata;
560
561 assert(m);
562 assert(device);
563
564 manager_process_seat_device(m, device);
565 return 0;
566 }
567
568 static int manager_dispatch_vcsa_udev(sd_device_monitor *monitor, sd_device *device, void *userdata) {
569 Manager *m = userdata;
570 const char *name;
571
572 assert(m);
573 assert(device);
574
575 /* Whenever a VCSA device is removed try to reallocate our
576 * VTs, to make sure our auto VTs never go away. */
577
578 if (sd_device_get_sysname(device, &name) >= 0 &&
579 startswith(name, "vcsa") &&
580 device_for_action(device, DEVICE_ACTION_REMOVE))
581 seat_preallocate_vts(m->seat0);
582
583 return 0;
584 }
585
586 static int manager_dispatch_button_udev(sd_device_monitor *monitor, sd_device *device, void *userdata) {
587 Manager *m = userdata;
588
589 assert(m);
590 assert(device);
591
592 manager_process_button_device(m, device);
593 return 0;
594 }
595
596 static int manager_dispatch_console(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
597 Manager *m = userdata;
598
599 assert(m);
600 assert(m->seat0);
601 assert(m->console_active_fd == fd);
602
603 seat_read_active_vt(m->seat0);
604 return 0;
605 }
606
607 static int manager_reserve_vt(Manager *m) {
608 _cleanup_free_ char *p = NULL;
609
610 assert(m);
611
612 if (m->reserve_vt <= 0)
613 return 0;
614
615 if (asprintf(&p, "/dev/tty%u", m->reserve_vt) < 0)
616 return log_oom();
617
618 m->reserve_vt_fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
619 if (m->reserve_vt_fd < 0) {
620
621 /* Don't complain on VT-less systems */
622 if (errno != ENOENT)
623 log_warning_errno(errno, "Failed to pin reserved VT: %m");
624 return -errno;
625 }
626
627 return 0;
628 }
629
630 static int manager_connect_bus(Manager *m) {
631 int r;
632
633 assert(m);
634 assert(!m->bus);
635
636 r = sd_bus_default_system(&m->bus);
637 if (r < 0)
638 return log_error_errno(r, "Failed to connect to system bus: %m");
639
640 r = bus_add_implementation(m->bus, &manager_object, m);
641 if (r < 0)
642 return r;
643
644 r = bus_log_control_api_register(m->bus);
645 if (r < 0)
646 return r;
647
648 r = bus_match_signal_async(m->bus, NULL, bus_systemd_mgr, "JobRemoved", match_job_removed, NULL, m);
649 if (r < 0)
650 return log_error_errno(r, "Failed to request match for JobRemoved: %m");
651
652 r = bus_match_signal_async(m->bus, NULL, bus_systemd_mgr, "UnitRemoved", match_unit_removed, NULL, m);
653 if (r < 0)
654 return log_error_errno(r, "Failed to request match for UnitRemoved: %m");
655
656 r = sd_bus_match_signal_async(
657 m->bus,
658 NULL,
659 "org.freedesktop.systemd1",
660 NULL,
661 "org.freedesktop.DBus.Properties",
662 "PropertiesChanged",
663 match_properties_changed, NULL, m);
664 if (r < 0)
665 return log_error_errno(r, "Failed to request match for PropertiesChanged: %m");
666
667 r = bus_match_signal_async(m->bus, NULL, bus_systemd_mgr, "Reloading", match_reloading, NULL, m);
668 if (r < 0)
669 return log_error_errno(r, "Failed to request match for Reloading: %m");
670
671 r = bus_call_method_async(m->bus, NULL, bus_systemd_mgr, "Subscribe", NULL, NULL, NULL);
672 if (r < 0)
673 return log_error_errno(r, "Failed to enable subscription: %m");
674
675 r = sd_bus_request_name_async(m->bus, NULL, "org.freedesktop.login1", 0, NULL, NULL);
676 if (r < 0)
677 return log_error_errno(r, "Failed to request name: %m");
678
679 r = sd_bus_attach_event(m->bus, m->event, SD_EVENT_PRIORITY_NORMAL);
680 if (r < 0)
681 return log_error_errno(r, "Failed to attach bus to event loop: %m");
682
683 return 0;
684 }
685
686 static int manager_vt_switch(sd_event_source *src, const struct signalfd_siginfo *si, void *data) {
687 Manager *m = data;
688 Session *active, *iter;
689
690 /*
691 * We got a VT-switch signal and we have to acknowledge it immediately.
692 * Preferably, we'd just use m->seat0->active->vtfd, but unfortunately,
693 * old user-space might run multiple sessions on a single VT, *sigh*.
694 * Therefore, we have to iterate all sessions and find one with a vtfd
695 * on the requested VT.
696 * As only VTs with active controllers have VT_PROCESS set, our current
697 * notion of the active VT might be wrong (for instance if the switch
698 * happens while we setup VT_PROCESS). Therefore, read the current VT
699 * first and then use s->active->vtnr as reference. Note that this is
700 * not racy, as no further VT-switch can happen as long as we're in
701 * synchronous VT_PROCESS mode.
702 */
703
704 assert(m->seat0);
705 seat_read_active_vt(m->seat0);
706
707 active = m->seat0->active;
708 if (!active || active->vtnr < 1) {
709 _cleanup_close_ int fd = -1;
710 int r;
711
712 /* We are requested to acknowledge the VT-switch signal by the kernel but
713 * there's no registered sessions for the current VT. Normally this
714 * shouldn't happen but something wrong might have happened when we tried
715 * to release the VT. Better be safe than sorry, and try to release the VT
716 * one more time otherwise the user will be locked with the current VT. */
717
718 log_warning("Received VT_PROCESS signal without a registered session, restoring VT.");
719
720 /* At this point we only have the kernel mapping for referring to the
721 * current VT. */
722 fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
723 if (fd < 0) {
724 log_warning_errno(fd, "Failed to open, ignoring: %m");
725 return 0;
726 }
727
728 r = vt_release(fd, true);
729 if (r < 0)
730 log_warning_errno(r, "Failed to release VT, ignoring: %m");
731
732 return 0;
733 }
734
735 if (active->vtfd >= 0) {
736 session_leave_vt(active);
737 } else {
738 LIST_FOREACH(sessions_by_seat, iter, m->seat0->sessions) {
739 if (iter->vtnr == active->vtnr && iter->vtfd >= 0) {
740 session_leave_vt(iter);
741 break;
742 }
743 }
744 }
745
746 return 0;
747 }
748
749 static int manager_connect_console(Manager *m) {
750 int r;
751
752 assert(m);
753 assert(m->console_active_fd < 0);
754
755 /* On certain systems (such as S390, Xen, and containers) /dev/tty0 does not exist (as there is no VC), so
756 * don't fail if we can't open it. */
757
758 if (access("/dev/tty0", F_OK) < 0)
759 return 0;
760
761 m->console_active_fd = open("/sys/class/tty/tty0/active", O_RDONLY|O_NOCTTY|O_CLOEXEC);
762 if (m->console_active_fd < 0) {
763
764 /* On some systems /dev/tty0 may exist even though /sys/class/tty/tty0 does not. These are broken, but
765 * common. Let's complain but continue anyway. */
766 if (errno == ENOENT) {
767 log_warning_errno(errno, "System has /dev/tty0 but not /sys/class/tty/tty0/active which is broken, ignoring: %m");
768 return 0;
769 }
770
771 return log_error_errno(errno, "Failed to open /sys/class/tty/tty0/active: %m");
772 }
773
774 r = sd_event_add_io(m->event, &m->console_active_event_source, m->console_active_fd, 0, manager_dispatch_console, m);
775 if (r < 0)
776 return log_error_errno(r, "Failed to watch foreground console: %m");
777
778 /*
779 * SIGRTMIN is used as global VT-release signal, SIGRTMIN + 1 is used
780 * as VT-acquire signal. We ignore any acquire-events (yes, we still
781 * have to provide a valid signal-number for it!) and acknowledge all
782 * release events immediately.
783 */
784
785 if (SIGRTMIN + 1 > SIGRTMAX)
786 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
787 "Not enough real-time signals available: %u-%u",
788 SIGRTMIN, SIGRTMAX);
789
790 assert_se(ignore_signals(SIGRTMIN + 1, -1) >= 0);
791 assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGRTMIN, -1) >= 0);
792
793 r = sd_event_add_signal(m->event, NULL, SIGRTMIN, manager_vt_switch, m);
794 if (r < 0)
795 return log_error_errno(r, "Failed to subscribe to signal: %m");
796
797 return 0;
798 }
799
800 static int manager_connect_udev(Manager *m) {
801 int r;
802
803 assert(m);
804 assert(!m->device_seat_monitor);
805 assert(!m->device_monitor);
806 assert(!m->device_vcsa_monitor);
807 assert(!m->device_button_monitor);
808
809 r = sd_device_monitor_new(&m->device_seat_monitor);
810 if (r < 0)
811 return r;
812
813 r = sd_device_monitor_filter_add_match_tag(m->device_seat_monitor, "master-of-seat");
814 if (r < 0)
815 return r;
816
817 r = sd_device_monitor_attach_event(m->device_seat_monitor, m->event);
818 if (r < 0)
819 return r;
820
821 r = sd_device_monitor_start(m->device_seat_monitor, manager_dispatch_seat_udev, m);
822 if (r < 0)
823 return r;
824
825 (void) sd_event_source_set_description(sd_device_monitor_get_event_source(m->device_seat_monitor), "logind-seat-monitor");
826
827 r = sd_device_monitor_new(&m->device_monitor);
828 if (r < 0)
829 return r;
830
831 r = sd_device_monitor_filter_add_match_subsystem_devtype(m->device_monitor, "input", NULL);
832 if (r < 0)
833 return r;
834
835 r = sd_device_monitor_filter_add_match_subsystem_devtype(m->device_monitor, "graphics", NULL);
836 if (r < 0)
837 return r;
838
839 r = sd_device_monitor_filter_add_match_subsystem_devtype(m->device_monitor, "drm", NULL);
840 if (r < 0)
841 return r;
842
843 r = sd_device_monitor_attach_event(m->device_monitor, m->event);
844 if (r < 0)
845 return r;
846
847 r = sd_device_monitor_start(m->device_monitor, manager_dispatch_device_udev, m);
848 if (r < 0)
849 return r;
850
851 (void) sd_event_source_set_description(sd_device_monitor_get_event_source(m->device_monitor), "logind-device-monitor");
852
853 /* Don't watch keys if nobody cares */
854 if (!manager_all_buttons_ignored(m)) {
855 r = sd_device_monitor_new(&m->device_button_monitor);
856 if (r < 0)
857 return r;
858
859 r = sd_device_monitor_filter_add_match_tag(m->device_button_monitor, "power-switch");
860 if (r < 0)
861 return r;
862
863 r = sd_device_monitor_filter_add_match_subsystem_devtype(m->device_button_monitor, "input", NULL);
864 if (r < 0)
865 return r;
866
867 r = sd_device_monitor_attach_event(m->device_button_monitor, m->event);
868 if (r < 0)
869 return r;
870
871 r = sd_device_monitor_start(m->device_button_monitor, manager_dispatch_button_udev, m);
872 if (r < 0)
873 return r;
874
875 (void) sd_event_source_set_description(sd_device_monitor_get_event_source(m->device_button_monitor), "logind-button-monitor");
876 }
877
878 /* Don't bother watching VCSA devices, if nobody cares */
879 if (m->n_autovts > 0 && m->console_active_fd >= 0) {
880
881 r = sd_device_monitor_new(&m->device_vcsa_monitor);
882 if (r < 0)
883 return r;
884
885 r = sd_device_monitor_filter_add_match_subsystem_devtype(m->device_vcsa_monitor, "vc", NULL);
886 if (r < 0)
887 return r;
888
889 r = sd_device_monitor_attach_event(m->device_vcsa_monitor, m->event);
890 if (r < 0)
891 return r;
892
893 r = sd_device_monitor_start(m->device_vcsa_monitor, manager_dispatch_vcsa_udev, m);
894 if (r < 0)
895 return r;
896
897 (void) sd_event_source_set_description(sd_device_monitor_get_event_source(m->device_vcsa_monitor), "logind-vcsa-monitor");
898 }
899
900 return 0;
901 }
902
903 static void manager_gc(Manager *m, bool drop_not_started) {
904 Seat *seat;
905 Session *session;
906 User *user;
907
908 assert(m);
909
910 while ((seat = m->seat_gc_queue)) {
911 LIST_REMOVE(gc_queue, m->seat_gc_queue, seat);
912 seat->in_gc_queue = false;
913
914 if (seat_may_gc(seat, drop_not_started)) {
915 seat_stop(seat, false);
916 seat_free(seat);
917 }
918 }
919
920 while ((session = m->session_gc_queue)) {
921 LIST_REMOVE(gc_queue, m->session_gc_queue, session);
922 session->in_gc_queue = false;
923
924 /* First, if we are not closing yet, initiate stopping */
925 if (session_may_gc(session, drop_not_started) &&
926 session_get_state(session) != SESSION_CLOSING)
927 (void) session_stop(session, false);
928
929 /* Normally, this should make the session referenced
930 * again, if it doesn't then let's get rid of it
931 * immediately */
932 if (session_may_gc(session, drop_not_started)) {
933 (void) session_finalize(session);
934 session_free(session);
935 }
936 }
937
938 while ((user = m->user_gc_queue)) {
939 LIST_REMOVE(gc_queue, m->user_gc_queue, user);
940 user->in_gc_queue = false;
941
942 /* First step: queue stop jobs */
943 if (user_may_gc(user, drop_not_started))
944 (void) user_stop(user, false);
945
946 /* Second step: finalize user */
947 if (user_may_gc(user, drop_not_started)) {
948 (void) user_finalize(user);
949 user_free(user);
950 }
951 }
952 }
953
954 static int manager_dispatch_idle_action(sd_event_source *s, uint64_t t, void *userdata) {
955 Manager *m = userdata;
956 struct dual_timestamp since;
957 usec_t n, elapse;
958 int r;
959
960 assert(m);
961
962 if (m->idle_action == HANDLE_IGNORE ||
963 m->idle_action_usec <= 0)
964 return 0;
965
966 n = now(CLOCK_MONOTONIC);
967
968 r = manager_get_idle_hint(m, &since);
969 if (r <= 0)
970 /* Not idle. Let's check if after a timeout it might be idle then. */
971 elapse = n + m->idle_action_usec;
972 else {
973 /* Idle! Let's see if it's time to do something, or if
974 * we shall sleep for longer. */
975
976 if (n >= since.monotonic + m->idle_action_usec &&
977 (m->idle_action_not_before_usec <= 0 || n >= m->idle_action_not_before_usec + m->idle_action_usec)) {
978 log_info("System idle. Doing %s operation.", handle_action_to_string(m->idle_action));
979
980 manager_handle_action(m, 0, m->idle_action, false, false);
981 m->idle_action_not_before_usec = n;
982 }
983
984 elapse = MAX(since.monotonic, m->idle_action_not_before_usec) + m->idle_action_usec;
985 }
986
987 if (!m->idle_action_event_source) {
988
989 r = sd_event_add_time(
990 m->event,
991 &m->idle_action_event_source,
992 CLOCK_MONOTONIC,
993 elapse, USEC_PER_SEC*30,
994 manager_dispatch_idle_action, m);
995 if (r < 0)
996 return log_error_errno(r, "Failed to add idle event source: %m");
997
998 r = sd_event_source_set_priority(m->idle_action_event_source, SD_EVENT_PRIORITY_IDLE+10);
999 if (r < 0)
1000 return log_error_errno(r, "Failed to set idle event source priority: %m");
1001 } else {
1002 r = sd_event_source_set_time(m->idle_action_event_source, elapse);
1003 if (r < 0)
1004 return log_error_errno(r, "Failed to set idle event timer: %m");
1005
1006 r = sd_event_source_set_enabled(m->idle_action_event_source, SD_EVENT_ONESHOT);
1007 if (r < 0)
1008 return log_error_errno(r, "Failed to enable idle event timer: %m");
1009 }
1010
1011 return 0;
1012 }
1013
1014 static int manager_dispatch_reload_signal(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
1015 Manager *m = userdata;
1016 int r;
1017
1018 manager_reset_config(m);
1019 r = manager_parse_config_file(m);
1020 if (r < 0)
1021 log_warning_errno(r, "Failed to parse config file, using defaults: %m");
1022 else
1023 log_info("Config file reloaded.");
1024
1025 return 0;
1026 }
1027
1028 static int manager_startup(Manager *m) {
1029 int r;
1030 Seat *seat;
1031 Session *session;
1032 User *user;
1033 Button *button;
1034 Inhibitor *inhibitor;
1035 Iterator i;
1036
1037 assert(m);
1038
1039 r = sd_event_add_signal(m->event, NULL, SIGHUP, manager_dispatch_reload_signal, m);
1040 if (r < 0)
1041 return log_error_errno(r, "Failed to register SIGHUP handler: %m");
1042
1043 /* Connect to utmp */
1044 manager_connect_utmp(m);
1045
1046 /* Connect to console */
1047 r = manager_connect_console(m);
1048 if (r < 0)
1049 return r;
1050
1051 /* Connect to udev */
1052 r = manager_connect_udev(m);
1053 if (r < 0)
1054 return log_error_errno(r, "Failed to create udev watchers: %m");
1055
1056 /* Connect to the bus */
1057 r = manager_connect_bus(m);
1058 if (r < 0)
1059 return r;
1060
1061 /* Instantiate magic seat 0 */
1062 r = manager_add_seat(m, "seat0", &m->seat0);
1063 if (r < 0)
1064 return log_error_errno(r, "Failed to add seat0: %m");
1065
1066 r = manager_set_lid_switch_ignore(m, 0 + m->holdoff_timeout_usec);
1067 if (r < 0)
1068 log_warning_errno(r, "Failed to set up lid switch ignore event source: %m");
1069
1070 /* Deserialize state */
1071 r = manager_enumerate_devices(m);
1072 if (r < 0)
1073 log_warning_errno(r, "Device enumeration failed: %m");
1074
1075 r = manager_enumerate_seats(m);
1076 if (r < 0)
1077 log_warning_errno(r, "Seat enumeration failed: %m");
1078
1079 r = manager_enumerate_users(m);
1080 if (r < 0)
1081 log_warning_errno(r, "User enumeration failed: %m");
1082
1083 r = manager_enumerate_sessions(m);
1084 if (r < 0)
1085 log_warning_errno(r, "Session enumeration failed: %m");
1086
1087 r = manager_enumerate_inhibitors(m);
1088 if (r < 0)
1089 log_warning_errno(r, "Inhibitor enumeration failed: %m");
1090
1091 r = manager_enumerate_buttons(m);
1092 if (r < 0)
1093 log_warning_errno(r, "Button enumeration failed: %m");
1094
1095 /* Remove stale objects before we start them */
1096 manager_gc(m, false);
1097
1098 /* Reserve the special reserved VT */
1099 manager_reserve_vt(m);
1100
1101 /* Read in utmp if it exists */
1102 manager_read_utmp(m);
1103
1104 /* And start everything */
1105 HASHMAP_FOREACH(seat, m->seats, i)
1106 (void) seat_start(seat);
1107
1108 HASHMAP_FOREACH(user, m->users, i)
1109 (void) user_start(user);
1110
1111 HASHMAP_FOREACH(session, m->sessions, i)
1112 (void) session_start(session, NULL, NULL);
1113
1114 HASHMAP_FOREACH(inhibitor, m->inhibitors, i) {
1115 (void) inhibitor_start(inhibitor);
1116
1117 /* Let's see if the inhibitor is dead now, then remove it */
1118 if (inhibitor_is_orphan(inhibitor)) {
1119 inhibitor_stop(inhibitor);
1120 inhibitor_free(inhibitor);
1121 }
1122 }
1123
1124 HASHMAP_FOREACH(button, m->buttons, i)
1125 button_check_switches(button);
1126
1127 manager_dispatch_idle_action(NULL, 0, m);
1128
1129 return 0;
1130 }
1131
1132 static int manager_run(Manager *m) {
1133 int r;
1134
1135 assert(m);
1136
1137 for (;;) {
1138 r = sd_event_get_state(m->event);
1139 if (r < 0)
1140 return r;
1141 if (r == SD_EVENT_FINISHED)
1142 return 0;
1143
1144 manager_gc(m, true);
1145
1146 r = manager_dispatch_delayed(m, false);
1147 if (r < 0)
1148 return r;
1149 if (r > 0)
1150 continue;
1151
1152 r = sd_event_run(m->event, (uint64_t) -1);
1153 if (r < 0)
1154 return r;
1155 }
1156 }
1157
1158 static int run(int argc, char *argv[]) {
1159 _cleanup_(manager_unrefp) Manager *m = NULL;
1160 int r;
1161
1162 log_set_facility(LOG_AUTH);
1163 log_setup_service();
1164
1165 r = service_parse_argv("systemd-logind.service",
1166 "Manager for user logins and devices and privileged operations.",
1167 BUS_IMPLEMENTATIONS(&manager_object,
1168 &log_control_object),
1169 argc, argv);
1170 if (r <= 0)
1171 return r;
1172
1173 umask(0022);
1174
1175 r = mac_selinux_init();
1176 if (r < 0)
1177 return r;
1178
1179 /* Always create the directories people can create inotify watches in. Note that some applications might check
1180 * for the existence of /run/systemd/seats/ to determine whether logind is available, so please always make
1181 * sure these directories are created early on and unconditionally. */
1182 (void) mkdir_label("/run/systemd/seats", 0755);
1183 (void) mkdir_label("/run/systemd/users", 0755);
1184 (void) mkdir_label("/run/systemd/sessions", 0755);
1185
1186 assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGHUP, SIGTERM, SIGINT, SIGCHLD, -1) >= 0);
1187
1188 r = manager_new(&m);
1189 if (r < 0)
1190 return log_error_errno(r, "Failed to allocate manager object: %m");
1191
1192 (void) manager_parse_config_file(m);
1193
1194 r = manager_startup(m);
1195 if (r < 0)
1196 return log_error_errno(r, "Failed to fully start up daemon: %m");
1197
1198 log_debug("systemd-logind running as pid "PID_FMT, getpid_cached());
1199 (void) sd_notify(false,
1200 "READY=1\n"
1201 "STATUS=Processing requests...");
1202
1203 r = manager_run(m);
1204
1205 log_debug("systemd-logind stopped as pid "PID_FMT, getpid_cached());
1206 (void) sd_notify(false,
1207 "STOPPING=1\n"
1208 "STATUS=Shutting down...");
1209
1210 return r;
1211 }
1212
1213 DEFINE_MAIN_FUNCTION(run);
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