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1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ | |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2011 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <errno.h> | |
23 | #include <pwd.h> | |
24 | #include <libudev.h> | |
25 | #include <fcntl.h> | |
26 | #include <string.h> | |
27 | #include <unistd.h> | |
28 | #include <sys/epoll.h> | |
29 | #include <sys/ioctl.h> | |
30 | #include <linux/vt.h> | |
31 | ||
32 | #include <systemd/sd-daemon.h> | |
33 | ||
34 | #include "logind.h" | |
35 | #include "dbus-common.h" | |
36 | #include "dbus-loop.h" | |
37 | #include "strv.h" | |
38 | #include "conf-parser.h" | |
39 | ||
40 | Manager *manager_new(void) { | |
41 | Manager *m; | |
42 | ||
43 | m = new0(Manager, 1); | |
44 | if (!m) | |
45 | return NULL; | |
46 | ||
47 | m->console_active_fd = -1; | |
48 | m->bus_fd = -1; | |
49 | m->udev_seat_fd = -1; | |
50 | m->udev_vcsa_fd = -1; | |
51 | m->epoll_fd = -1; | |
52 | m->n_autovts = 6; | |
53 | ||
54 | m->devices = hashmap_new(string_hash_func, string_compare_func); | |
55 | m->seats = hashmap_new(string_hash_func, string_compare_func); | |
56 | m->sessions = hashmap_new(string_hash_func, string_compare_func); | |
57 | m->users = hashmap_new(trivial_hash_func, trivial_compare_func); | |
58 | m->cgroups = hashmap_new(string_hash_func, string_compare_func); | |
59 | m->fifo_fds = hashmap_new(trivial_hash_func, trivial_compare_func); | |
60 | ||
61 | if (!m->devices || !m->seats || !m->sessions || !m->users || !m->cgroups || !m->fifo_fds) { | |
62 | manager_free(m); | |
63 | return NULL; | |
64 | } | |
65 | ||
66 | m->reset_controllers = strv_new("cpu", NULL); | |
67 | m->kill_exclude_users = strv_new("root", NULL); | |
68 | if (!m->reset_controllers || !m->kill_exclude_users) { | |
69 | manager_free(m); | |
70 | return NULL; | |
71 | } | |
72 | ||
73 | m->udev = udev_new(); | |
74 | if (!m->udev) { | |
75 | manager_free(m); | |
76 | return NULL; | |
77 | } | |
78 | ||
79 | if (cg_get_user_path(&m->cgroup_path) < 0) { | |
80 | manager_free(m); | |
81 | return NULL; | |
82 | } | |
83 | ||
84 | return m; | |
85 | } | |
86 | ||
87 | void manager_free(Manager *m) { | |
88 | Session *session; | |
89 | User *u; | |
90 | Device *d; | |
91 | Seat *s; | |
92 | ||
93 | assert(m); | |
94 | ||
95 | while ((session = hashmap_first(m->sessions))) | |
96 | session_free(session); | |
97 | ||
98 | while ((u = hashmap_first(m->users))) | |
99 | user_free(u); | |
100 | ||
101 | while ((d = hashmap_first(m->devices))) | |
102 | device_free(d); | |
103 | ||
104 | while ((s = hashmap_first(m->seats))) | |
105 | seat_free(s); | |
106 | ||
107 | hashmap_free(m->sessions); | |
108 | hashmap_free(m->users); | |
109 | hashmap_free(m->devices); | |
110 | hashmap_free(m->seats); | |
111 | hashmap_free(m->cgroups); | |
112 | hashmap_free(m->fifo_fds); | |
113 | ||
114 | if (m->console_active_fd >= 0) | |
115 | close_nointr_nofail(m->console_active_fd); | |
116 | ||
117 | if (m->udev_seat_monitor) | |
118 | udev_monitor_unref(m->udev_seat_monitor); | |
119 | ||
120 | if (m->udev_vcsa_monitor) | |
121 | udev_monitor_unref(m->udev_vcsa_monitor); | |
122 | ||
123 | if (m->udev) | |
124 | udev_unref(m->udev); | |
125 | ||
126 | if (m->bus) { | |
127 | dbus_connection_flush(m->bus); | |
128 | dbus_connection_close(m->bus); | |
129 | dbus_connection_unref(m->bus); | |
130 | } | |
131 | ||
132 | if (m->bus_fd >= 0) | |
133 | close_nointr_nofail(m->bus_fd); | |
134 | ||
135 | if (m->epoll_fd >= 0) | |
136 | close_nointr_nofail(m->epoll_fd); | |
137 | ||
138 | strv_free(m->controllers); | |
139 | strv_free(m->reset_controllers); | |
140 | strv_free(m->kill_only_users); | |
141 | strv_free(m->kill_exclude_users); | |
142 | ||
143 | free(m->cgroup_path); | |
144 | free(m); | |
145 | } | |
146 | ||
147 | int manager_add_device(Manager *m, const char *sysfs, Device **_device) { | |
148 | Device *d; | |
149 | ||
150 | assert(m); | |
151 | assert(sysfs); | |
152 | ||
153 | d = hashmap_get(m->devices, sysfs); | |
154 | if (d) { | |
155 | if (_device) | |
156 | *_device = d; | |
157 | ||
158 | return 0; | |
159 | } | |
160 | ||
161 | d = device_new(m, sysfs); | |
162 | if (!d) | |
163 | return -ENOMEM; | |
164 | ||
165 | if (_device) | |
166 | *_device = d; | |
167 | ||
168 | return 0; | |
169 | } | |
170 | ||
171 | int manager_add_seat(Manager *m, const char *id, Seat **_seat) { | |
172 | Seat *s; | |
173 | ||
174 | assert(m); | |
175 | assert(id); | |
176 | ||
177 | s = hashmap_get(m->seats, id); | |
178 | if (s) { | |
179 | if (_seat) | |
180 | *_seat = s; | |
181 | ||
182 | return 0; | |
183 | } | |
184 | ||
185 | s = seat_new(m, id); | |
186 | if (!s) | |
187 | return -ENOMEM; | |
188 | ||
189 | if (_seat) | |
190 | *_seat = s; | |
191 | ||
192 | return 0; | |
193 | } | |
194 | ||
195 | int manager_add_session(Manager *m, User *u, const char *id, Session **_session) { | |
196 | Session *s; | |
197 | ||
198 | assert(m); | |
199 | assert(id); | |
200 | ||
201 | s = hashmap_get(m->sessions, id); | |
202 | if (s) { | |
203 | if (_session) | |
204 | *_session = s; | |
205 | ||
206 | return 0; | |
207 | } | |
208 | ||
209 | s = session_new(m, u, id); | |
210 | if (!s) | |
211 | return -ENOMEM; | |
212 | ||
213 | if (_session) | |
214 | *_session = s; | |
215 | ||
216 | return 0; | |
217 | } | |
218 | ||
219 | int manager_add_user(Manager *m, uid_t uid, gid_t gid, const char *name, User **_user) { | |
220 | User *u; | |
221 | ||
222 | assert(m); | |
223 | assert(name); | |
224 | ||
225 | u = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid)); | |
226 | if (u) { | |
227 | if (_user) | |
228 | *_user = u; | |
229 | ||
230 | return 0; | |
231 | } | |
232 | ||
233 | u = user_new(m, uid, gid, name); | |
234 | if (!u) | |
235 | return -ENOMEM; | |
236 | ||
237 | if (_user) | |
238 | *_user = u; | |
239 | ||
240 | return 0; | |
241 | } | |
242 | ||
243 | int manager_add_user_by_name(Manager *m, const char *name, User **_user) { | |
244 | uid_t uid; | |
245 | gid_t gid; | |
246 | int r; | |
247 | ||
248 | assert(m); | |
249 | assert(name); | |
250 | ||
251 | r = get_user_creds(&name, &uid, &gid, NULL); | |
252 | if (r < 0) | |
253 | return r; | |
254 | ||
255 | return manager_add_user(m, uid, gid, name, _user); | |
256 | } | |
257 | ||
258 | int manager_add_user_by_uid(Manager *m, uid_t uid, User **_user) { | |
259 | struct passwd *p; | |
260 | ||
261 | assert(m); | |
262 | ||
263 | errno = 0; | |
264 | p = getpwuid(uid); | |
265 | if (!p) | |
266 | return errno ? -errno : -ENOENT; | |
267 | ||
268 | return manager_add_user(m, uid, p->pw_gid, p->pw_name, _user); | |
269 | } | |
270 | ||
271 | int manager_process_seat_device(Manager *m, struct udev_device *d) { | |
272 | Device *device; | |
273 | int r; | |
274 | ||
275 | assert(m); | |
276 | ||
277 | if (streq_ptr(udev_device_get_action(d), "remove")) { | |
278 | ||
279 | device = hashmap_get(m->devices, udev_device_get_syspath(d)); | |
280 | if (!device) | |
281 | return 0; | |
282 | ||
283 | seat_add_to_gc_queue(device->seat); | |
284 | device_free(device); | |
285 | ||
286 | } else { | |
287 | const char *sn; | |
288 | Seat *seat; | |
289 | ||
290 | sn = udev_device_get_property_value(d, "ID_SEAT"); | |
291 | if (isempty(sn)) | |
292 | sn = "seat0"; | |
293 | ||
294 | if (!seat_name_is_valid(sn)) { | |
295 | log_warning("Device with invalid seat name %s found, ignoring.", sn); | |
296 | return 0; | |
297 | } | |
298 | ||
299 | r = manager_add_device(m, udev_device_get_syspath(d), &device); | |
300 | if (r < 0) | |
301 | return r; | |
302 | ||
303 | r = manager_add_seat(m, sn, &seat); | |
304 | if (r < 0) { | |
305 | if (!device->seat) | |
306 | device_free(device); | |
307 | ||
308 | return r; | |
309 | } | |
310 | ||
311 | device_attach(device, seat); | |
312 | seat_start(seat); | |
313 | } | |
314 | ||
315 | return 0; | |
316 | } | |
317 | ||
318 | int manager_enumerate_devices(Manager *m) { | |
319 | struct udev_list_entry *item = NULL, *first = NULL; | |
320 | struct udev_enumerate *e; | |
321 | int r; | |
322 | ||
323 | assert(m); | |
324 | ||
325 | /* Loads devices from udev and creates seats for them as | |
326 | * necessary */ | |
327 | ||
328 | e = udev_enumerate_new(m->udev); | |
329 | if (!e) { | |
330 | r = -ENOMEM; | |
331 | goto finish; | |
332 | } | |
333 | ||
334 | r = udev_enumerate_add_match_subsystem(e, "graphics"); | |
335 | if (r < 0) | |
336 | goto finish; | |
337 | ||
338 | r = udev_enumerate_add_match_tag(e, "seat"); | |
339 | if (r < 0) | |
340 | goto finish; | |
341 | ||
342 | r = udev_enumerate_scan_devices(e); | |
343 | if (r < 0) | |
344 | goto finish; | |
345 | ||
346 | first = udev_enumerate_get_list_entry(e); | |
347 | udev_list_entry_foreach(item, first) { | |
348 | struct udev_device *d; | |
349 | int k; | |
350 | ||
351 | d = udev_device_new_from_syspath(m->udev, udev_list_entry_get_name(item)); | |
352 | if (!d) { | |
353 | r = -ENOMEM; | |
354 | goto finish; | |
355 | } | |
356 | ||
357 | k = manager_process_seat_device(m, d); | |
358 | udev_device_unref(d); | |
359 | ||
360 | if (k < 0) | |
361 | r = k; | |
362 | } | |
363 | ||
364 | finish: | |
365 | if (e) | |
366 | udev_enumerate_unref(e); | |
367 | ||
368 | return r; | |
369 | } | |
370 | ||
371 | int manager_enumerate_seats(Manager *m) { | |
372 | DIR *d; | |
373 | struct dirent *de; | |
374 | int r = 0; | |
375 | ||
376 | assert(m); | |
377 | ||
378 | /* This loads data about seats stored on disk, but does not | |
379 | * actually create any seats. Removes data of seats that no | |
380 | * longer exist. */ | |
381 | ||
382 | d = opendir("/run/systemd/seats"); | |
383 | if (!d) { | |
384 | if (errno == ENOENT) | |
385 | return 0; | |
386 | ||
387 | log_error("Failed to open /run/systemd/seats: %m"); | |
388 | return -errno; | |
389 | } | |
390 | ||
391 | while ((de = readdir(d))) { | |
392 | Seat *s; | |
393 | int k; | |
394 | ||
395 | if (!dirent_is_file(de)) | |
396 | continue; | |
397 | ||
398 | s = hashmap_get(m->seats, de->d_name); | |
399 | if (!s) { | |
400 | unlinkat(dirfd(d), de->d_name, 0); | |
401 | continue; | |
402 | } | |
403 | ||
404 | k = seat_load(s); | |
405 | if (k < 0) | |
406 | r = k; | |
407 | } | |
408 | ||
409 | closedir(d); | |
410 | ||
411 | return r; | |
412 | } | |
413 | ||
414 | static int manager_enumerate_users_from_cgroup(Manager *m) { | |
415 | int r = 0; | |
416 | char *name; | |
417 | DIR *d; | |
418 | int k; | |
419 | ||
420 | r = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_path, &d); | |
421 | if (r < 0) { | |
422 | if (r == -ENOENT) | |
423 | return 0; | |
424 | ||
425 | log_error("Failed to open %s: %s", m->cgroup_path, strerror(-r)); | |
426 | return r; | |
427 | } | |
428 | ||
429 | while ((k = cg_read_subgroup(d, &name)) > 0) { | |
430 | User *user; | |
431 | ||
432 | k = manager_add_user_by_name(m, name, &user); | |
433 | if (k < 0) { | |
434 | free(name); | |
435 | r = k; | |
436 | continue; | |
437 | } | |
438 | ||
439 | user_add_to_gc_queue(user); | |
440 | ||
441 | if (!user->cgroup_path) | |
442 | if (asprintf(&user->cgroup_path, "%s/%s", m->cgroup_path, name) < 0) { | |
443 | r = -ENOMEM; | |
444 | free(name); | |
445 | break; | |
446 | } | |
447 | ||
448 | free(name); | |
449 | } | |
450 | ||
451 | if (r >= 0 && k < 0) | |
452 | r = k; | |
453 | ||
454 | closedir(d); | |
455 | ||
456 | return r; | |
457 | } | |
458 | ||
459 | static int manager_enumerate_linger_users(Manager *m) { | |
460 | DIR *d; | |
461 | struct dirent *de; | |
462 | int r = 0; | |
463 | ||
464 | d = opendir("/var/lib/systemd/linger"); | |
465 | if (!d) { | |
466 | if (errno == ENOENT) | |
467 | return 0; | |
468 | ||
469 | log_error("Failed to open /var/lib/systemd/linger/: %m"); | |
470 | return -errno; | |
471 | } | |
472 | ||
473 | while ((de = readdir(d))) { | |
474 | int k; | |
475 | ||
476 | if (!dirent_is_file(de)) | |
477 | continue; | |
478 | ||
479 | k = manager_add_user_by_name(m, de->d_name, NULL); | |
480 | if (k < 0) { | |
481 | log_notice("Couldn't add lingering user %s: %s", de->d_name, strerror(-k)); | |
482 | r = k; | |
483 | } | |
484 | } | |
485 | ||
486 | closedir(d); | |
487 | ||
488 | return r; | |
489 | } | |
490 | ||
491 | int manager_enumerate_users(Manager *m) { | |
492 | DIR *d; | |
493 | struct dirent *de; | |
494 | int r, k; | |
495 | ||
496 | assert(m); | |
497 | ||
498 | /* First, enumerate user cgroups */ | |
499 | r = manager_enumerate_users_from_cgroup(m); | |
500 | ||
501 | /* Second, add lingering users on top */ | |
502 | k = manager_enumerate_linger_users(m); | |
503 | if (k < 0) | |
504 | r = k; | |
505 | ||
506 | /* Third, read in user data stored on disk */ | |
507 | d = opendir("/run/systemd/users"); | |
508 | if (!d) { | |
509 | if (errno == ENOENT) | |
510 | return 0; | |
511 | ||
512 | log_error("Failed to open /run/systemd/users: %m"); | |
513 | return -errno; | |
514 | } | |
515 | ||
516 | while ((de = readdir(d))) { | |
517 | uid_t uid; | |
518 | User *u; | |
519 | ||
520 | if (!dirent_is_file(de)) | |
521 | continue; | |
522 | ||
523 | k = parse_uid(de->d_name, &uid); | |
524 | if (k < 0) { | |
525 | log_error("Failed to parse file name %s: %s", de->d_name, strerror(-k)); | |
526 | continue; | |
527 | } | |
528 | ||
529 | u = hashmap_get(m->users, ULONG_TO_PTR(uid)); | |
530 | if (!u) { | |
531 | unlinkat(dirfd(d), de->d_name, 0); | |
532 | continue; | |
533 | } | |
534 | ||
535 | k = user_load(u); | |
536 | if (k < 0) | |
537 | r = k; | |
538 | } | |
539 | ||
540 | closedir(d); | |
541 | ||
542 | return r; | |
543 | } | |
544 | ||
545 | static int manager_enumerate_sessions_from_cgroup(Manager *m) { | |
546 | User *u; | |
547 | Iterator i; | |
548 | int r = 0; | |
549 | ||
550 | HASHMAP_FOREACH(u, m->users, i) { | |
551 | DIR *d; | |
552 | char *name; | |
553 | int k; | |
554 | ||
555 | if (!u->cgroup_path) | |
556 | continue; | |
557 | ||
558 | k = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, &d); | |
559 | if (k < 0) { | |
560 | if (k == -ENOENT) | |
561 | continue; | |
562 | ||
563 | log_error("Failed to open %s: %s", u->cgroup_path, strerror(-k)); | |
564 | r = k; | |
565 | continue; | |
566 | } | |
567 | ||
568 | while ((k = cg_read_subgroup(d, &name)) > 0) { | |
569 | Session *session; | |
570 | ||
571 | if (streq(name, "shared")) | |
572 | continue; | |
573 | ||
574 | k = manager_add_session(m, u, name, &session); | |
575 | if (k < 0) { | |
576 | free(name); | |
577 | break; | |
578 | } | |
579 | ||
580 | session_add_to_gc_queue(session); | |
581 | ||
582 | if (!session->cgroup_path) | |
583 | if (asprintf(&session->cgroup_path, "%s/%s", u->cgroup_path, name) < 0) { | |
584 | k = -ENOMEM; | |
585 | free(name); | |
586 | break; | |
587 | } | |
588 | ||
589 | free(name); | |
590 | } | |
591 | ||
592 | closedir(d); | |
593 | ||
594 | if (k < 0) | |
595 | r = k; | |
596 | } | |
597 | ||
598 | return r; | |
599 | } | |
600 | ||
601 | int manager_enumerate_sessions(Manager *m) { | |
602 | DIR *d; | |
603 | struct dirent *de; | |
604 | int r = 0; | |
605 | ||
606 | assert(m); | |
607 | ||
608 | /* First enumerate session cgroups */ | |
609 | r = manager_enumerate_sessions_from_cgroup(m); | |
610 | ||
611 | /* Second, read in session data stored on disk */ | |
612 | d = opendir("/run/systemd/sessions"); | |
613 | if (!d) { | |
614 | if (errno == ENOENT) | |
615 | return 0; | |
616 | ||
617 | log_error("Failed to open /run/systemd/sessions: %m"); | |
618 | return -errno; | |
619 | } | |
620 | ||
621 | while ((de = readdir(d))) { | |
622 | struct Session *s; | |
623 | int k; | |
624 | ||
625 | if (!dirent_is_file(de)) | |
626 | continue; | |
627 | ||
628 | s = hashmap_get(m->sessions, de->d_name); | |
629 | if (!s) { | |
630 | unlinkat(dirfd(d), de->d_name, 0); | |
631 | continue; | |
632 | } | |
633 | ||
634 | k = session_load(s); | |
635 | if (k < 0) | |
636 | r = k; | |
637 | } | |
638 | ||
639 | closedir(d); | |
640 | ||
641 | return r; | |
642 | } | |
643 | ||
644 | int manager_dispatch_seat_udev(Manager *m) { | |
645 | struct udev_device *d; | |
646 | int r; | |
647 | ||
648 | assert(m); | |
649 | ||
650 | d = udev_monitor_receive_device(m->udev_seat_monitor); | |
651 | if (!d) | |
652 | return -ENOMEM; | |
653 | ||
654 | r = manager_process_seat_device(m, d); | |
655 | udev_device_unref(d); | |
656 | ||
657 | return r; | |
658 | } | |
659 | ||
660 | int manager_dispatch_vcsa_udev(Manager *m) { | |
661 | struct udev_device *d; | |
662 | int r = 0; | |
663 | const char *name; | |
664 | ||
665 | assert(m); | |
666 | ||
667 | d = udev_monitor_receive_device(m->udev_vcsa_monitor); | |
668 | if (!d) | |
669 | return -ENOMEM; | |
670 | ||
671 | name = udev_device_get_sysname(d); | |
672 | ||
673 | /* Whenever a VCSA device is removed try to reallocate our | |
674 | * VTs, to make sure our auto VTs never go away. */ | |
675 | ||
676 | if (name && startswith(name, "vcsa") && streq_ptr(udev_device_get_action(d), "remove")) | |
677 | r = seat_preallocate_vts(m->vtconsole); | |
678 | ||
679 | udev_device_unref(d); | |
680 | ||
681 | return r; | |
682 | } | |
683 | ||
684 | int manager_dispatch_console(Manager *m) { | |
685 | assert(m); | |
686 | ||
687 | if (m->vtconsole) | |
688 | seat_read_active_vt(m->vtconsole); | |
689 | ||
690 | return 0; | |
691 | } | |
692 | ||
693 | static int vt_is_busy(int vtnr) { | |
694 | struct vt_stat vt_stat; | |
695 | int r = 0, fd; | |
696 | ||
697 | assert(vtnr >= 1); | |
698 | ||
699 | /* We explicitly open /dev/tty1 here instead of /dev/tty0. If | |
700 | * we'd open the latter we'd open the foreground tty which | |
701 | * hence would be unconditionally busy. By opening /dev/tty1 | |
702 | * we avoid this. Since tty1 is special and needs to be an | |
703 | * explicitly loaded getty or DM this is safe. */ | |
704 | ||
705 | fd = open_terminal("/dev/tty1", O_RDWR|O_NOCTTY|O_CLOEXEC); | |
706 | if (fd < 0) | |
707 | return -errno; | |
708 | ||
709 | if (ioctl(fd, VT_GETSTATE, &vt_stat) < 0) | |
710 | r = -errno; | |
711 | else | |
712 | r = !!(vt_stat.v_state & (1 << vtnr)); | |
713 | ||
714 | close_nointr_nofail(fd); | |
715 | ||
716 | return r; | |
717 | } | |
718 | ||
719 | int manager_spawn_autovt(Manager *m, int vtnr) { | |
720 | int r; | |
721 | DBusMessage *message = NULL, *reply = NULL; | |
722 | char *name = NULL; | |
723 | const char *mode = "fail"; | |
724 | DBusError error; | |
725 | ||
726 | assert(m); | |
727 | assert(vtnr >= 1); | |
728 | ||
729 | dbus_error_init(&error); | |
730 | ||
731 | if ((unsigned) vtnr > m->n_autovts) | |
732 | return 0; | |
733 | ||
734 | r = vt_is_busy(vtnr); | |
735 | if (r < 0) | |
736 | return r; | |
737 | else if (r > 0) | |
738 | return -EBUSY; | |
739 | ||
740 | message = dbus_message_new_method_call("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "StartUnit"); | |
741 | if (!message) { | |
742 | log_error("Could not allocate message."); | |
743 | r = -ENOMEM; | |
744 | goto finish; | |
745 | } | |
746 | ||
747 | if (asprintf(&name, "autovt@tty%i.service", vtnr) < 0) { | |
748 | log_error("Could not allocate service name."); | |
749 | r = -ENOMEM; | |
750 | goto finish; | |
751 | } | |
752 | ||
753 | if (!dbus_message_append_args(message, | |
754 | DBUS_TYPE_STRING, &name, | |
755 | DBUS_TYPE_STRING, &mode, | |
756 | DBUS_TYPE_INVALID)) { | |
757 | log_error("Could not attach target and flag information to message."); | |
758 | r = -ENOMEM; | |
759 | goto finish; | |
760 | } | |
761 | ||
762 | reply = dbus_connection_send_with_reply_and_block(m->bus, message, -1, &error); | |
763 | if (!reply) { | |
764 | log_error("Failed to start unit: %s", bus_error_message(&error)); | |
765 | goto finish; | |
766 | } | |
767 | ||
768 | r = 0; | |
769 | ||
770 | finish: | |
771 | free(name); | |
772 | ||
773 | if (message) | |
774 | dbus_message_unref(message); | |
775 | ||
776 | if (reply) | |
777 | dbus_message_unref(reply); | |
778 | ||
779 | dbus_error_free(&error); | |
780 | ||
781 | return r; | |
782 | } | |
783 | ||
784 | int manager_get_session_by_cgroup(Manager *m, const char *cgroup, Session **session) { | |
785 | Session *s; | |
786 | char *p; | |
787 | ||
788 | assert(m); | |
789 | assert(cgroup); | |
790 | assert(session); | |
791 | ||
792 | s = hashmap_get(m->cgroups, cgroup); | |
793 | if (s) { | |
794 | *session = s; | |
795 | return 1; | |
796 | } | |
797 | ||
798 | p = strdup(cgroup); | |
799 | if (!p) { | |
800 | log_error("Out of memory."); | |
801 | return -ENOMEM; | |
802 | } | |
803 | ||
804 | for (;;) { | |
805 | char *e; | |
806 | ||
807 | e = strrchr(p, '/'); | |
808 | if (!e || e == p) { | |
809 | free(p); | |
810 | *session = NULL; | |
811 | return 0; | |
812 | } | |
813 | ||
814 | *e = 0; | |
815 | ||
816 | s = hashmap_get(m->cgroups, p); | |
817 | if (s) { | |
818 | free(p); | |
819 | *session = s; | |
820 | return 1; | |
821 | } | |
822 | } | |
823 | } | |
824 | ||
825 | int manager_get_session_by_pid(Manager *m, pid_t pid, Session **session) { | |
826 | char *p; | |
827 | int r; | |
828 | ||
829 | assert(m); | |
830 | assert(pid >= 1); | |
831 | assert(session); | |
832 | ||
833 | r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &p); | |
834 | if (r < 0) | |
835 | return r; | |
836 | ||
837 | r = manager_get_session_by_cgroup(m, p, session); | |
838 | free(p); | |
839 | ||
840 | return r; | |
841 | } | |
842 | ||
843 | void manager_cgroup_notify_empty(Manager *m, const char *cgroup) { | |
844 | Session *s; | |
845 | int r; | |
846 | ||
847 | r = manager_get_session_by_cgroup(m, cgroup, &s); | |
848 | if (r <= 0) | |
849 | return; | |
850 | ||
851 | session_add_to_gc_queue(s); | |
852 | } | |
853 | ||
854 | static void manager_pipe_notify_eof(Manager *m, int fd) { | |
855 | Session *s; | |
856 | ||
857 | assert_se(m); | |
858 | assert_se(fd >= 0); | |
859 | ||
860 | assert_se(s = hashmap_get(m->fifo_fds, INT_TO_PTR(fd + 1))); | |
861 | assert(s->fifo_fd == fd); | |
862 | session_remove_fifo(s); | |
863 | ||
864 | session_stop(s); | |
865 | } | |
866 | ||
867 | static int manager_connect_bus(Manager *m) { | |
868 | DBusError error; | |
869 | int r; | |
870 | struct epoll_event ev; | |
871 | ||
872 | assert(m); | |
873 | assert(!m->bus); | |
874 | assert(m->bus_fd < 0); | |
875 | ||
876 | dbus_error_init(&error); | |
877 | ||
878 | m->bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error); | |
879 | if (!m->bus) { | |
880 | log_error("Failed to get system D-Bus connection: %s", bus_error_message(&error)); | |
881 | r = -ECONNREFUSED; | |
882 | goto fail; | |
883 | } | |
884 | ||
885 | if (!dbus_connection_register_object_path(m->bus, "/org/freedesktop/login1", &bus_manager_vtable, m) || | |
886 | !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/seat", &bus_seat_vtable, m) || | |
887 | !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/session", &bus_session_vtable, m) || | |
888 | !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/user", &bus_user_vtable, m) || | |
889 | !dbus_connection_add_filter(m->bus, bus_message_filter, m, NULL)) { | |
890 | log_error("Not enough memory"); | |
891 | r = -ENOMEM; | |
892 | goto fail; | |
893 | } | |
894 | ||
895 | dbus_bus_add_match(m->bus, | |
896 | "type='signal'," | |
897 | "interface='org.freedesktop.systemd1.Agent'," | |
898 | "member='Released'," | |
899 | "path='/org/freedesktop/systemd1/agent'", | |
900 | &error); | |
901 | ||
902 | if (dbus_error_is_set(&error)) { | |
903 | log_error("Failed to register match: %s", bus_error_message(&error)); | |
904 | r = -EIO; | |
905 | goto fail; | |
906 | } | |
907 | ||
908 | r = dbus_bus_request_name(m->bus, "org.freedesktop.login1", DBUS_NAME_FLAG_DO_NOT_QUEUE, &error); | |
909 | if (dbus_error_is_set(&error)) { | |
910 | log_error("Failed to register name on bus: %s", bus_error_message(&error)); | |
911 | r = -EIO; | |
912 | goto fail; | |
913 | } | |
914 | ||
915 | if (r != DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER) { | |
916 | log_error("Failed to acquire name."); | |
917 | r = -EEXIST; | |
918 | goto fail; | |
919 | } | |
920 | ||
921 | m->bus_fd = bus_loop_open(m->bus); | |
922 | if (m->bus_fd < 0) { | |
923 | r = m->bus_fd; | |
924 | goto fail; | |
925 | } | |
926 | ||
927 | zero(ev); | |
928 | ev.events = EPOLLIN; | |
929 | ev.data.u32 = FD_BUS; | |
930 | ||
931 | if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->bus_fd, &ev) < 0) | |
932 | goto fail; | |
933 | ||
934 | return 0; | |
935 | ||
936 | fail: | |
937 | dbus_error_free(&error); | |
938 | ||
939 | return r; | |
940 | } | |
941 | ||
942 | static int manager_connect_console(Manager *m) { | |
943 | struct epoll_event ev; | |
944 | ||
945 | assert(m); | |
946 | assert(m->console_active_fd < 0); | |
947 | ||
948 | m->console_active_fd = open("/sys/class/tty/tty0/active", O_RDONLY|O_NOCTTY|O_CLOEXEC); | |
949 | if (m->console_active_fd < 0) { | |
950 | ||
951 | /* On certain architectures (S390 and Xen), /dev/tty0 | |
952 | does not exist, so don't fail if we can't open it.*/ | |
953 | if (errno == ENOENT) | |
954 | return 0; | |
955 | ||
956 | log_error("Failed to open /sys/class/tty/tty0/active: %m"); | |
957 | return -errno; | |
958 | } | |
959 | ||
960 | zero(ev); | |
961 | ev.events = 0; | |
962 | ev.data.u32 = FD_CONSOLE; | |
963 | ||
964 | if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->console_active_fd, &ev) < 0) | |
965 | return -errno; | |
966 | ||
967 | return 0; | |
968 | } | |
969 | ||
970 | static int manager_connect_udev(Manager *m) { | |
971 | struct epoll_event ev; | |
972 | int r; | |
973 | ||
974 | assert(m); | |
975 | assert(!m->udev_seat_monitor); | |
976 | assert(!m->udev_vcsa_monitor); | |
977 | ||
978 | m->udev_seat_monitor = udev_monitor_new_from_netlink(m->udev, "udev"); | |
979 | if (!m->udev_seat_monitor) | |
980 | return -ENOMEM; | |
981 | ||
982 | r = udev_monitor_filter_add_match_tag(m->udev_seat_monitor, "seat"); | |
983 | if (r < 0) | |
984 | return r; | |
985 | ||
986 | r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_seat_monitor, "graphics", NULL); | |
987 | if (r < 0) | |
988 | return r; | |
989 | ||
990 | r = udev_monitor_enable_receiving(m->udev_seat_monitor); | |
991 | if (r < 0) | |
992 | return r; | |
993 | ||
994 | m->udev_seat_fd = udev_monitor_get_fd(m->udev_seat_monitor); | |
995 | ||
996 | zero(ev); | |
997 | ev.events = EPOLLIN; | |
998 | ev.data.u32 = FD_SEAT_UDEV; | |
999 | ||
1000 | /* Don't bother watching VCSA devices, if nobody cares */ | |
1001 | if (m->n_autovts <= 0 || m->console_active_fd < 0) | |
1002 | return 0; | |
1003 | ||
1004 | if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_seat_fd, &ev) < 0) | |
1005 | return -errno; | |
1006 | ||
1007 | m->udev_vcsa_monitor = udev_monitor_new_from_netlink(m->udev, "udev"); | |
1008 | if (!m->udev_vcsa_monitor) | |
1009 | return -ENOMEM; | |
1010 | ||
1011 | r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_vcsa_monitor, "vc", NULL); | |
1012 | if (r < 0) | |
1013 | return r; | |
1014 | ||
1015 | r = udev_monitor_enable_receiving(m->udev_vcsa_monitor); | |
1016 | if (r < 0) | |
1017 | return r; | |
1018 | ||
1019 | m->udev_vcsa_fd = udev_monitor_get_fd(m->udev_vcsa_monitor); | |
1020 | ||
1021 | zero(ev); | |
1022 | ev.events = EPOLLIN; | |
1023 | ev.data.u32 = FD_VCSA_UDEV; | |
1024 | ||
1025 | if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_vcsa_fd, &ev) < 0) | |
1026 | return -errno; | |
1027 | ||
1028 | return 0; | |
1029 | } | |
1030 | ||
1031 | void manager_gc(Manager *m, bool drop_not_started) { | |
1032 | Seat *seat; | |
1033 | Session *session; | |
1034 | User *user; | |
1035 | ||
1036 | assert(m); | |
1037 | ||
1038 | while ((seat = m->seat_gc_queue)) { | |
1039 | LIST_REMOVE(Seat, gc_queue, m->seat_gc_queue, seat); | |
1040 | seat->in_gc_queue = false; | |
1041 | ||
1042 | if (seat_check_gc(seat, drop_not_started) == 0) { | |
1043 | seat_stop(seat); | |
1044 | seat_free(seat); | |
1045 | } | |
1046 | } | |
1047 | ||
1048 | while ((session = m->session_gc_queue)) { | |
1049 | LIST_REMOVE(Session, gc_queue, m->session_gc_queue, session); | |
1050 | session->in_gc_queue = false; | |
1051 | ||
1052 | if (session_check_gc(session, drop_not_started) == 0) { | |
1053 | session_stop(session); | |
1054 | session_free(session); | |
1055 | } | |
1056 | } | |
1057 | ||
1058 | while ((user = m->user_gc_queue)) { | |
1059 | LIST_REMOVE(User, gc_queue, m->user_gc_queue, user); | |
1060 | user->in_gc_queue = false; | |
1061 | ||
1062 | if (user_check_gc(user, drop_not_started) == 0) { | |
1063 | user_stop(user); | |
1064 | user_free(user); | |
1065 | } | |
1066 | } | |
1067 | } | |
1068 | ||
1069 | int manager_get_idle_hint(Manager *m, dual_timestamp *t) { | |
1070 | Session *s; | |
1071 | bool idle_hint = true; | |
1072 | dual_timestamp ts = { 0, 0 }; | |
1073 | Iterator i; | |
1074 | ||
1075 | assert(m); | |
1076 | ||
1077 | HASHMAP_FOREACH(s, m->sessions, i) { | |
1078 | dual_timestamp k; | |
1079 | int ih; | |
1080 | ||
1081 | ih = session_get_idle_hint(s, &k); | |
1082 | if (ih < 0) | |
1083 | return ih; | |
1084 | ||
1085 | if (!ih) { | |
1086 | if (!idle_hint) { | |
1087 | if (k.monotonic < ts.monotonic) | |
1088 | ts = k; | |
1089 | } else { | |
1090 | idle_hint = false; | |
1091 | ts = k; | |
1092 | } | |
1093 | } else if (idle_hint) { | |
1094 | ||
1095 | if (k.monotonic > ts.monotonic) | |
1096 | ts = k; | |
1097 | } | |
1098 | } | |
1099 | ||
1100 | if (t) | |
1101 | *t = ts; | |
1102 | ||
1103 | return idle_hint; | |
1104 | } | |
1105 | ||
1106 | int manager_startup(Manager *m) { | |
1107 | int r; | |
1108 | Seat *seat; | |
1109 | Session *session; | |
1110 | User *user; | |
1111 | Iterator i; | |
1112 | ||
1113 | assert(m); | |
1114 | assert(m->epoll_fd <= 0); | |
1115 | ||
1116 | m->epoll_fd = epoll_create1(EPOLL_CLOEXEC); | |
1117 | if (m->epoll_fd < 0) | |
1118 | return -errno; | |
1119 | ||
1120 | /* Connect to console */ | |
1121 | r = manager_connect_console(m); | |
1122 | if (r < 0) | |
1123 | return r; | |
1124 | ||
1125 | /* Connect to udev */ | |
1126 | r = manager_connect_udev(m); | |
1127 | if (r < 0) | |
1128 | return r; | |
1129 | ||
1130 | /* Connect to the bus */ | |
1131 | r = manager_connect_bus(m); | |
1132 | if (r < 0) | |
1133 | return r; | |
1134 | ||
1135 | /* Instantiate magic seat 0 */ | |
1136 | r = manager_add_seat(m, "seat0", &m->vtconsole); | |
1137 | if (r < 0) | |
1138 | return r; | |
1139 | ||
1140 | /* Deserialize state */ | |
1141 | manager_enumerate_devices(m); | |
1142 | manager_enumerate_seats(m); | |
1143 | manager_enumerate_users(m); | |
1144 | manager_enumerate_sessions(m); | |
1145 | ||
1146 | /* Remove stale objects before we start them */ | |
1147 | manager_gc(m, false); | |
1148 | ||
1149 | /* And start everything */ | |
1150 | HASHMAP_FOREACH(seat, m->seats, i) | |
1151 | seat_start(seat); | |
1152 | ||
1153 | HASHMAP_FOREACH(user, m->users, i) | |
1154 | user_start(user); | |
1155 | ||
1156 | HASHMAP_FOREACH(session, m->sessions, i) | |
1157 | session_start(session); | |
1158 | ||
1159 | return 0; | |
1160 | } | |
1161 | ||
1162 | int manager_run(Manager *m) { | |
1163 | assert(m); | |
1164 | ||
1165 | for (;;) { | |
1166 | struct epoll_event event; | |
1167 | int n; | |
1168 | ||
1169 | manager_gc(m, true); | |
1170 | ||
1171 | if (dbus_connection_dispatch(m->bus) != DBUS_DISPATCH_COMPLETE) | |
1172 | continue; | |
1173 | ||
1174 | manager_gc(m, true); | |
1175 | ||
1176 | n = epoll_wait(m->epoll_fd, &event, 1, -1); | |
1177 | if (n < 0) { | |
1178 | if (errno == EINTR || errno == EAGAIN) | |
1179 | continue; | |
1180 | ||
1181 | log_error("epoll() failed: %m"); | |
1182 | return -errno; | |
1183 | } | |
1184 | ||
1185 | switch (event.data.u32) { | |
1186 | ||
1187 | case FD_SEAT_UDEV: | |
1188 | manager_dispatch_seat_udev(m); | |
1189 | break; | |
1190 | ||
1191 | case FD_VCSA_UDEV: | |
1192 | manager_dispatch_vcsa_udev(m); | |
1193 | break; | |
1194 | ||
1195 | case FD_CONSOLE: | |
1196 | manager_dispatch_console(m); | |
1197 | break; | |
1198 | ||
1199 | case FD_BUS: | |
1200 | bus_loop_dispatch(m->bus_fd); | |
1201 | break; | |
1202 | ||
1203 | default: | |
1204 | if (event.data.u32 >= FD_FIFO_BASE) | |
1205 | manager_pipe_notify_eof(m, event.data.u32 - FD_FIFO_BASE); | |
1206 | } | |
1207 | } | |
1208 | ||
1209 | return 0; | |
1210 | } | |
1211 | ||
1212 | static int manager_parse_config_file(Manager *m) { | |
1213 | FILE *f; | |
1214 | const char *fn; | |
1215 | int r; | |
1216 | ||
1217 | assert(m); | |
1218 | ||
1219 | fn = "/etc/systemd/logind.conf"; | |
1220 | f = fopen(fn, "re"); | |
1221 | if (!f) { | |
1222 | if (errno == ENOENT) | |
1223 | return 0; | |
1224 | ||
1225 | log_warning("Failed to open configuration file %s: %m", fn); | |
1226 | return -errno; | |
1227 | } | |
1228 | ||
1229 | r = config_parse(fn, f, "Login\0", config_item_perf_lookup, (void*) logind_gperf_lookup, false, m); | |
1230 | if (r < 0) | |
1231 | log_warning("Failed to parse configuration file: %s", strerror(-r)); | |
1232 | ||
1233 | fclose(f); | |
1234 | ||
1235 | return r; | |
1236 | } | |
1237 | ||
1238 | int main(int argc, char *argv[]) { | |
1239 | Manager *m = NULL; | |
1240 | int r; | |
1241 | ||
1242 | log_set_target(LOG_TARGET_AUTO); | |
1243 | log_set_facility(LOG_AUTH); | |
1244 | log_parse_environment(); | |
1245 | log_open(); | |
1246 | ||
1247 | umask(0022); | |
1248 | ||
1249 | if (argc != 1) { | |
1250 | log_error("This program takes no arguments."); | |
1251 | r = -EINVAL; | |
1252 | goto finish; | |
1253 | } | |
1254 | ||
1255 | m = manager_new(); | |
1256 | if (!m) { | |
1257 | log_error("Out of memory"); | |
1258 | r = -ENOMEM; | |
1259 | goto finish; | |
1260 | } | |
1261 | ||
1262 | manager_parse_config_file(m); | |
1263 | ||
1264 | r = manager_startup(m); | |
1265 | if (r < 0) { | |
1266 | log_error("Failed to fully start up daemon: %s", strerror(-r)); | |
1267 | goto finish; | |
1268 | } | |
1269 | ||
1270 | log_debug("systemd-logind running as pid %lu", (unsigned long) getpid()); | |
1271 | ||
1272 | sd_notify(false, | |
1273 | "READY=1\n" | |
1274 | "STATUS=Processing requests..."); | |
1275 | ||
1276 | r = manager_run(m); | |
1277 | ||
1278 | log_debug("systemd-logind stopped as pid %lu", (unsigned long) getpid()); | |
1279 | ||
1280 | finish: | |
1281 | sd_notify(false, | |
1282 | "STATUS=Shutting down..."); | |
1283 | ||
1284 | if (m) | |
1285 | manager_free(m); | |
1286 | ||
1287 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; | |
1288 | } |