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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 <fcntl.h> | |
24 | #include <linux/kd.h> | |
25 | #include <linux/vt.h> | |
26 | #include <signal.h> | |
27 | #include <string.h> | |
28 | #include <sys/ioctl.h> | |
29 | #include <unistd.h> | |
30 | ||
31 | #include "sd-messages.h" | |
32 | ||
33 | #include "audit-util.h" | |
34 | #include "bus-error.h" | |
35 | #include "bus-util.h" | |
36 | #include "escape.h" | |
37 | #include "fd-util.h" | |
38 | #include "fd-util.h" | |
39 | #include "fileio.h" | |
40 | #include "formats-util.h" | |
41 | #include "io-util.h" | |
42 | #include "logind-session.h" | |
43 | #include "mkdir.h" | |
44 | #include "parse-util.h" | |
45 | #include "path-util.h" | |
46 | #include "string-table.h" | |
47 | #include "terminal-util.h" | |
48 | #include "user-util.h" | |
49 | #include "util.h" | |
50 | ||
51 | #define RELEASE_USEC (20*USEC_PER_SEC) | |
52 | ||
53 | static void session_remove_fifo(Session *s); | |
54 | ||
55 | Session* session_new(Manager *m, const char *id) { | |
56 | Session *s; | |
57 | ||
58 | assert(m); | |
59 | assert(id); | |
60 | assert(session_id_valid(id)); | |
61 | ||
62 | s = new0(Session, 1); | |
63 | if (!s) | |
64 | return NULL; | |
65 | ||
66 | s->state_file = strappend("/run/systemd/sessions/", id); | |
67 | if (!s->state_file) { | |
68 | free(s); | |
69 | return NULL; | |
70 | } | |
71 | ||
72 | s->devices = hashmap_new(&devt_hash_ops); | |
73 | if (!s->devices) { | |
74 | free(s->state_file); | |
75 | free(s); | |
76 | return NULL; | |
77 | } | |
78 | ||
79 | s->id = basename(s->state_file); | |
80 | ||
81 | if (hashmap_put(m->sessions, s->id, s) < 0) { | |
82 | hashmap_free(s->devices); | |
83 | free(s->state_file); | |
84 | free(s); | |
85 | return NULL; | |
86 | } | |
87 | ||
88 | s->manager = m; | |
89 | s->fifo_fd = -1; | |
90 | s->vtfd = -1; | |
91 | ||
92 | return s; | |
93 | } | |
94 | ||
95 | void session_free(Session *s) { | |
96 | SessionDevice *sd; | |
97 | ||
98 | assert(s); | |
99 | ||
100 | if (s->in_gc_queue) | |
101 | LIST_REMOVE(gc_queue, s->manager->session_gc_queue, s); | |
102 | ||
103 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); | |
104 | ||
105 | session_remove_fifo(s); | |
106 | ||
107 | session_drop_controller(s); | |
108 | ||
109 | while ((sd = hashmap_first(s->devices))) | |
110 | session_device_free(sd); | |
111 | ||
112 | hashmap_free(s->devices); | |
113 | ||
114 | if (s->user) { | |
115 | LIST_REMOVE(sessions_by_user, s->user->sessions, s); | |
116 | ||
117 | if (s->user->display == s) | |
118 | s->user->display = NULL; | |
119 | } | |
120 | ||
121 | if (s->seat) { | |
122 | if (s->seat->active == s) | |
123 | s->seat->active = NULL; | |
124 | if (s->seat->pending_switch == s) | |
125 | s->seat->pending_switch = NULL; | |
126 | ||
127 | seat_evict_position(s->seat, s); | |
128 | LIST_REMOVE(sessions_by_seat, s->seat->sessions, s); | |
129 | } | |
130 | ||
131 | if (s->scope) { | |
132 | hashmap_remove(s->manager->session_units, s->scope); | |
133 | free(s->scope); | |
134 | } | |
135 | ||
136 | free(s->scope_job); | |
137 | ||
138 | sd_bus_message_unref(s->create_message); | |
139 | ||
140 | free(s->tty); | |
141 | free(s->display); | |
142 | free(s->remote_host); | |
143 | free(s->remote_user); | |
144 | free(s->service); | |
145 | free(s->desktop); | |
146 | ||
147 | hashmap_remove(s->manager->sessions, s->id); | |
148 | ||
149 | free(s->state_file); | |
150 | free(s); | |
151 | } | |
152 | ||
153 | void session_set_user(Session *s, User *u) { | |
154 | assert(s); | |
155 | assert(!s->user); | |
156 | ||
157 | s->user = u; | |
158 | LIST_PREPEND(sessions_by_user, u->sessions, s); | |
159 | } | |
160 | ||
161 | int session_save(Session *s) { | |
162 | _cleanup_free_ char *temp_path = NULL; | |
163 | _cleanup_fclose_ FILE *f = NULL; | |
164 | int r = 0; | |
165 | ||
166 | assert(s); | |
167 | ||
168 | if (!s->user) | |
169 | return -ESTALE; | |
170 | ||
171 | if (!s->started) | |
172 | return 0; | |
173 | ||
174 | r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0); | |
175 | if (r < 0) | |
176 | goto fail; | |
177 | ||
178 | r = fopen_temporary(s->state_file, &f, &temp_path); | |
179 | if (r < 0) | |
180 | goto fail; | |
181 | ||
182 | assert(s->user); | |
183 | ||
184 | fchmod(fileno(f), 0644); | |
185 | ||
186 | fprintf(f, | |
187 | "# This is private data. Do not parse.\n" | |
188 | "UID="UID_FMT"\n" | |
189 | "USER=%s\n" | |
190 | "ACTIVE=%i\n" | |
191 | "STATE=%s\n" | |
192 | "REMOTE=%i\n", | |
193 | s->user->uid, | |
194 | s->user->name, | |
195 | session_is_active(s), | |
196 | session_state_to_string(session_get_state(s)), | |
197 | s->remote); | |
198 | ||
199 | if (s->type >= 0) | |
200 | fprintf(f, "TYPE=%s\n", session_type_to_string(s->type)); | |
201 | ||
202 | if (s->class >= 0) | |
203 | fprintf(f, "CLASS=%s\n", session_class_to_string(s->class)); | |
204 | ||
205 | if (s->scope) | |
206 | fprintf(f, "SCOPE=%s\n", s->scope); | |
207 | if (s->scope_job) | |
208 | fprintf(f, "SCOPE_JOB=%s\n", s->scope_job); | |
209 | ||
210 | if (s->fifo_path) | |
211 | fprintf(f, "FIFO=%s\n", s->fifo_path); | |
212 | ||
213 | if (s->seat) | |
214 | fprintf(f, "SEAT=%s\n", s->seat->id); | |
215 | ||
216 | if (s->tty) | |
217 | fprintf(f, "TTY=%s\n", s->tty); | |
218 | ||
219 | if (s->display) | |
220 | fprintf(f, "DISPLAY=%s\n", s->display); | |
221 | ||
222 | if (s->remote_host) { | |
223 | _cleanup_free_ char *escaped; | |
224 | ||
225 | escaped = cescape(s->remote_host); | |
226 | if (!escaped) { | |
227 | r = -ENOMEM; | |
228 | goto fail; | |
229 | } | |
230 | ||
231 | fprintf(f, "REMOTE_HOST=%s\n", escaped); | |
232 | } | |
233 | ||
234 | if (s->remote_user) { | |
235 | _cleanup_free_ char *escaped; | |
236 | ||
237 | escaped = cescape(s->remote_user); | |
238 | if (!escaped) { | |
239 | r = -ENOMEM; | |
240 | goto fail; | |
241 | } | |
242 | ||
243 | fprintf(f, "REMOTE_USER=%s\n", escaped); | |
244 | } | |
245 | ||
246 | if (s->service) { | |
247 | _cleanup_free_ char *escaped; | |
248 | ||
249 | escaped = cescape(s->service); | |
250 | if (!escaped) { | |
251 | r = -ENOMEM; | |
252 | goto fail; | |
253 | } | |
254 | ||
255 | fprintf(f, "SERVICE=%s\n", escaped); | |
256 | } | |
257 | ||
258 | if (s->desktop) { | |
259 | _cleanup_free_ char *escaped; | |
260 | ||
261 | ||
262 | escaped = cescape(s->desktop); | |
263 | if (!escaped) { | |
264 | r = -ENOMEM; | |
265 | goto fail; | |
266 | } | |
267 | ||
268 | fprintf(f, "DESKTOP=%s\n", escaped); | |
269 | } | |
270 | ||
271 | if (s->seat && seat_has_vts(s->seat)) | |
272 | fprintf(f, "VTNR=%u\n", s->vtnr); | |
273 | ||
274 | if (!s->vtnr) | |
275 | fprintf(f, "POSITION=%u\n", s->position); | |
276 | ||
277 | if (s->leader > 0) | |
278 | fprintf(f, "LEADER="PID_FMT"\n", s->leader); | |
279 | ||
280 | if (s->audit_id > 0) | |
281 | fprintf(f, "AUDIT=%"PRIu32"\n", s->audit_id); | |
282 | ||
283 | if (dual_timestamp_is_set(&s->timestamp)) | |
284 | fprintf(f, | |
285 | "REALTIME="USEC_FMT"\n" | |
286 | "MONOTONIC="USEC_FMT"\n", | |
287 | s->timestamp.realtime, | |
288 | s->timestamp.monotonic); | |
289 | ||
290 | if (s->controller) | |
291 | fprintf(f, "CONTROLLER=%s\n", s->controller); | |
292 | ||
293 | r = fflush_and_check(f); | |
294 | if (r < 0) | |
295 | goto fail; | |
296 | ||
297 | if (rename(temp_path, s->state_file) < 0) { | |
298 | r = -errno; | |
299 | goto fail; | |
300 | } | |
301 | ||
302 | return 0; | |
303 | ||
304 | fail: | |
305 | (void) unlink(s->state_file); | |
306 | ||
307 | if (temp_path) | |
308 | (void) unlink(temp_path); | |
309 | ||
310 | return log_error_errno(r, "Failed to save session data %s: %m", s->state_file); | |
311 | } | |
312 | ||
313 | ||
314 | int session_load(Session *s) { | |
315 | _cleanup_free_ char *remote = NULL, | |
316 | *seat = NULL, | |
317 | *vtnr = NULL, | |
318 | *state = NULL, | |
319 | *position = NULL, | |
320 | *leader = NULL, | |
321 | *type = NULL, | |
322 | *class = NULL, | |
323 | *uid = NULL, | |
324 | *realtime = NULL, | |
325 | *monotonic = NULL, | |
326 | *controller = NULL; | |
327 | ||
328 | int k, r; | |
329 | ||
330 | assert(s); | |
331 | ||
332 | r = parse_env_file(s->state_file, NEWLINE, | |
333 | "REMOTE", &remote, | |
334 | "SCOPE", &s->scope, | |
335 | "SCOPE_JOB", &s->scope_job, | |
336 | "FIFO", &s->fifo_path, | |
337 | "SEAT", &seat, | |
338 | "TTY", &s->tty, | |
339 | "DISPLAY", &s->display, | |
340 | "REMOTE_HOST", &s->remote_host, | |
341 | "REMOTE_USER", &s->remote_user, | |
342 | "SERVICE", &s->service, | |
343 | "DESKTOP", &s->desktop, | |
344 | "VTNR", &vtnr, | |
345 | "STATE", &state, | |
346 | "POSITION", &position, | |
347 | "LEADER", &leader, | |
348 | "TYPE", &type, | |
349 | "CLASS", &class, | |
350 | "UID", &uid, | |
351 | "REALTIME", &realtime, | |
352 | "MONOTONIC", &monotonic, | |
353 | "CONTROLLER", &controller, | |
354 | NULL); | |
355 | ||
356 | if (r < 0) | |
357 | return log_error_errno(r, "Failed to read %s: %m", s->state_file); | |
358 | ||
359 | if (!s->user) { | |
360 | uid_t u; | |
361 | User *user; | |
362 | ||
363 | if (!uid) { | |
364 | log_error("UID not specified for session %s", s->id); | |
365 | return -ENOENT; | |
366 | } | |
367 | ||
368 | r = parse_uid(uid, &u); | |
369 | if (r < 0) { | |
370 | log_error("Failed to parse UID value %s for session %s.", uid, s->id); | |
371 | return r; | |
372 | } | |
373 | ||
374 | user = hashmap_get(s->manager->users, UID_TO_PTR(u)); | |
375 | if (!user) { | |
376 | log_error("User of session %s not known.", s->id); | |
377 | return -ENOENT; | |
378 | } | |
379 | ||
380 | session_set_user(s, user); | |
381 | } | |
382 | ||
383 | if (remote) { | |
384 | k = parse_boolean(remote); | |
385 | if (k >= 0) | |
386 | s->remote = k; | |
387 | } | |
388 | ||
389 | if (vtnr) | |
390 | safe_atou(vtnr, &s->vtnr); | |
391 | ||
392 | if (seat && !s->seat) { | |
393 | Seat *o; | |
394 | ||
395 | o = hashmap_get(s->manager->seats, seat); | |
396 | if (o) | |
397 | r = seat_attach_session(o, s); | |
398 | if (!o || r < 0) | |
399 | log_error("Cannot attach session %s to seat %s", s->id, seat); | |
400 | } | |
401 | ||
402 | if (!s->seat || !seat_has_vts(s->seat)) | |
403 | s->vtnr = 0; | |
404 | ||
405 | if (position && s->seat) { | |
406 | unsigned int npos; | |
407 | ||
408 | safe_atou(position, &npos); | |
409 | seat_claim_position(s->seat, s, npos); | |
410 | } | |
411 | ||
412 | if (leader) { | |
413 | k = parse_pid(leader, &s->leader); | |
414 | if (k >= 0) | |
415 | audit_session_from_pid(s->leader, &s->audit_id); | |
416 | } | |
417 | ||
418 | if (type) { | |
419 | SessionType t; | |
420 | ||
421 | t = session_type_from_string(type); | |
422 | if (t >= 0) | |
423 | s->type = t; | |
424 | } | |
425 | ||
426 | if (class) { | |
427 | SessionClass c; | |
428 | ||
429 | c = session_class_from_string(class); | |
430 | if (c >= 0) | |
431 | s->class = c; | |
432 | } | |
433 | ||
434 | if (state && streq(state, "closing")) | |
435 | s->stopping = true; | |
436 | ||
437 | if (s->fifo_path) { | |
438 | int fd; | |
439 | ||
440 | /* If we open an unopened pipe for reading we will not | |
441 | get an EOF. to trigger an EOF we hence open it for | |
442 | writing, but close it right away which then will | |
443 | trigger the EOF. This will happen immediately if no | |
444 | other process has the FIFO open for writing, i. e. | |
445 | when the session died before logind (re)started. */ | |
446 | ||
447 | fd = session_create_fifo(s); | |
448 | safe_close(fd); | |
449 | } | |
450 | ||
451 | if (realtime) { | |
452 | unsigned long long l; | |
453 | if (sscanf(realtime, "%llu", &l) > 0) | |
454 | s->timestamp.realtime = l; | |
455 | } | |
456 | ||
457 | if (monotonic) { | |
458 | unsigned long long l; | |
459 | if (sscanf(monotonic, "%llu", &l) > 0) | |
460 | s->timestamp.monotonic = l; | |
461 | } | |
462 | ||
463 | if (controller) { | |
464 | if (bus_name_has_owner(s->manager->bus, controller, NULL) > 0) | |
465 | session_set_controller(s, controller, false); | |
466 | else | |
467 | session_restore_vt(s); | |
468 | } | |
469 | ||
470 | return r; | |
471 | } | |
472 | ||
473 | int session_activate(Session *s) { | |
474 | unsigned int num_pending; | |
475 | ||
476 | assert(s); | |
477 | assert(s->user); | |
478 | ||
479 | if (!s->seat) | |
480 | return -EOPNOTSUPP; | |
481 | ||
482 | if (s->seat->active == s) | |
483 | return 0; | |
484 | ||
485 | /* on seats with VTs, we let VTs manage session-switching */ | |
486 | if (seat_has_vts(s->seat)) { | |
487 | if (!s->vtnr) | |
488 | return -EOPNOTSUPP; | |
489 | ||
490 | return chvt(s->vtnr); | |
491 | } | |
492 | ||
493 | /* On seats without VTs, we implement session-switching in logind. We | |
494 | * try to pause all session-devices and wait until the session | |
495 | * controller acknowledged them. Once all devices are asleep, we simply | |
496 | * switch the active session and be done. | |
497 | * We save the session we want to switch to in seat->pending_switch and | |
498 | * seat_complete_switch() will perform the final switch. */ | |
499 | ||
500 | s->seat->pending_switch = s; | |
501 | ||
502 | /* if no devices are running, immediately perform the session switch */ | |
503 | num_pending = session_device_try_pause_all(s); | |
504 | if (!num_pending) | |
505 | seat_complete_switch(s->seat); | |
506 | ||
507 | return 0; | |
508 | } | |
509 | ||
510 | static int session_start_scope(Session *s) { | |
511 | int r; | |
512 | ||
513 | assert(s); | |
514 | assert(s->user); | |
515 | assert(s->user->slice); | |
516 | ||
517 | if (!s->scope) { | |
518 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; | |
519 | _cleanup_free_ char *description = NULL; | |
520 | char *scope, *job = NULL; | |
521 | ||
522 | description = strjoin("Session ", s->id, " of user ", s->user->name, NULL); | |
523 | if (!description) | |
524 | return log_oom(); | |
525 | ||
526 | scope = strjoin("session-", s->id, ".scope", NULL); | |
527 | if (!scope) | |
528 | return log_oom(); | |
529 | ||
530 | r = manager_start_scope(s->manager, scope, s->leader, s->user->slice, description, "systemd-logind.service", "systemd-user-sessions.service", &error, &job); | |
531 | if (r < 0) { | |
532 | log_error("Failed to start session scope %s: %s %s", | |
533 | scope, bus_error_message(&error, r), error.name); | |
534 | free(scope); | |
535 | return r; | |
536 | } else { | |
537 | s->scope = scope; | |
538 | ||
539 | free(s->scope_job); | |
540 | s->scope_job = job; | |
541 | } | |
542 | } | |
543 | ||
544 | if (s->scope) | |
545 | hashmap_put(s->manager->session_units, s->scope, s); | |
546 | ||
547 | return 0; | |
548 | } | |
549 | ||
550 | int session_start(Session *s) { | |
551 | int r; | |
552 | ||
553 | assert(s); | |
554 | ||
555 | if (!s->user) | |
556 | return -ESTALE; | |
557 | ||
558 | if (s->started) | |
559 | return 0; | |
560 | ||
561 | r = user_start(s->user); | |
562 | if (r < 0) | |
563 | return r; | |
564 | ||
565 | /* Create cgroup */ | |
566 | r = session_start_scope(s); | |
567 | if (r < 0) | |
568 | return r; | |
569 | ||
570 | log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO, | |
571 | LOG_MESSAGE_ID(SD_MESSAGE_SESSION_START), | |
572 | "SESSION_ID=%s", s->id, | |
573 | "USER_ID=%s", s->user->name, | |
574 | "LEADER="PID_FMT, s->leader, | |
575 | LOG_MESSAGE("New session %s of user %s.", s->id, s->user->name), | |
576 | NULL); | |
577 | ||
578 | if (!dual_timestamp_is_set(&s->timestamp)) | |
579 | dual_timestamp_get(&s->timestamp); | |
580 | ||
581 | if (s->seat) | |
582 | seat_read_active_vt(s->seat); | |
583 | ||
584 | s->started = true; | |
585 | ||
586 | user_elect_display(s->user); | |
587 | ||
588 | /* Save data */ | |
589 | session_save(s); | |
590 | user_save(s->user); | |
591 | if (s->seat) | |
592 | seat_save(s->seat); | |
593 | ||
594 | /* Send signals */ | |
595 | session_send_signal(s, true); | |
596 | user_send_changed(s->user, "Sessions", "Display", NULL); | |
597 | if (s->seat) { | |
598 | if (s->seat->active == s) | |
599 | seat_send_changed(s->seat, "Sessions", "ActiveSession", NULL); | |
600 | else | |
601 | seat_send_changed(s->seat, "Sessions", NULL); | |
602 | } | |
603 | ||
604 | return 0; | |
605 | } | |
606 | ||
607 | static int session_stop_scope(Session *s, bool force) { | |
608 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; | |
609 | char *job = NULL; | |
610 | int r; | |
611 | ||
612 | assert(s); | |
613 | ||
614 | if (!s->scope) | |
615 | return 0; | |
616 | ||
617 | if (force || manager_shall_kill(s->manager, s->user->name)) { | |
618 | r = manager_stop_unit(s->manager, s->scope, &error, &job); | |
619 | if (r < 0) { | |
620 | log_error("Failed to stop session scope: %s", bus_error_message(&error, r)); | |
621 | return r; | |
622 | } | |
623 | ||
624 | free(s->scope_job); | |
625 | s->scope_job = job; | |
626 | } else { | |
627 | r = manager_abandon_scope(s->manager, s->scope, &error); | |
628 | if (r < 0) { | |
629 | log_error("Failed to abandon session scope: %s", bus_error_message(&error, r)); | |
630 | return r; | |
631 | } | |
632 | } | |
633 | ||
634 | return 0; | |
635 | } | |
636 | ||
637 | int session_stop(Session *s, bool force) { | |
638 | int r; | |
639 | ||
640 | assert(s); | |
641 | ||
642 | if (!s->user) | |
643 | return -ESTALE; | |
644 | ||
645 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); | |
646 | ||
647 | if (s->seat) | |
648 | seat_evict_position(s->seat, s); | |
649 | ||
650 | /* We are going down, don't care about FIFOs anymore */ | |
651 | session_remove_fifo(s); | |
652 | ||
653 | /* Kill cgroup */ | |
654 | r = session_stop_scope(s, force); | |
655 | ||
656 | s->stopping = true; | |
657 | ||
658 | user_elect_display(s->user); | |
659 | ||
660 | session_save(s); | |
661 | user_save(s->user); | |
662 | ||
663 | return r; | |
664 | } | |
665 | ||
666 | int session_finalize(Session *s) { | |
667 | SessionDevice *sd; | |
668 | ||
669 | assert(s); | |
670 | ||
671 | if (!s->user) | |
672 | return -ESTALE; | |
673 | ||
674 | if (s->started) | |
675 | log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO, | |
676 | LOG_MESSAGE_ID(SD_MESSAGE_SESSION_STOP), | |
677 | "SESSION_ID=%s", s->id, | |
678 | "USER_ID=%s", s->user->name, | |
679 | "LEADER="PID_FMT, s->leader, | |
680 | LOG_MESSAGE("Removed session %s.", s->id), | |
681 | NULL); | |
682 | ||
683 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); | |
684 | ||
685 | if (s->seat) | |
686 | seat_evict_position(s->seat, s); | |
687 | ||
688 | /* Kill session devices */ | |
689 | while ((sd = hashmap_first(s->devices))) | |
690 | session_device_free(sd); | |
691 | ||
692 | (void) unlink(s->state_file); | |
693 | session_add_to_gc_queue(s); | |
694 | user_add_to_gc_queue(s->user); | |
695 | ||
696 | if (s->started) { | |
697 | session_send_signal(s, false); | |
698 | s->started = false; | |
699 | } | |
700 | ||
701 | if (s->seat) { | |
702 | if (s->seat->active == s) | |
703 | seat_set_active(s->seat, NULL); | |
704 | ||
705 | seat_save(s->seat); | |
706 | seat_send_changed(s->seat, "Sessions", NULL); | |
707 | } | |
708 | ||
709 | user_save(s->user); | |
710 | user_send_changed(s->user, "Sessions", "Display", NULL); | |
711 | ||
712 | return 0; | |
713 | } | |
714 | ||
715 | static int release_timeout_callback(sd_event_source *es, uint64_t usec, void *userdata) { | |
716 | Session *s = userdata; | |
717 | ||
718 | assert(es); | |
719 | assert(s); | |
720 | ||
721 | session_stop(s, false); | |
722 | return 0; | |
723 | } | |
724 | ||
725 | int session_release(Session *s) { | |
726 | assert(s); | |
727 | ||
728 | if (!s->started || s->stopping) | |
729 | return 0; | |
730 | ||
731 | if (s->timer_event_source) | |
732 | return 0; | |
733 | ||
734 | return sd_event_add_time(s->manager->event, | |
735 | &s->timer_event_source, | |
736 | CLOCK_MONOTONIC, | |
737 | now(CLOCK_MONOTONIC) + RELEASE_USEC, 0, | |
738 | release_timeout_callback, s); | |
739 | } | |
740 | ||
741 | bool session_is_active(Session *s) { | |
742 | assert(s); | |
743 | ||
744 | if (!s->seat) | |
745 | return true; | |
746 | ||
747 | return s->seat->active == s; | |
748 | } | |
749 | ||
750 | static int get_tty_atime(const char *tty, usec_t *atime) { | |
751 | _cleanup_free_ char *p = NULL; | |
752 | struct stat st; | |
753 | ||
754 | assert(tty); | |
755 | assert(atime); | |
756 | ||
757 | if (!path_is_absolute(tty)) { | |
758 | p = strappend("/dev/", tty); | |
759 | if (!p) | |
760 | return -ENOMEM; | |
761 | ||
762 | tty = p; | |
763 | } else if (!path_startswith(tty, "/dev/")) | |
764 | return -ENOENT; | |
765 | ||
766 | if (lstat(tty, &st) < 0) | |
767 | return -errno; | |
768 | ||
769 | *atime = timespec_load(&st.st_atim); | |
770 | return 0; | |
771 | } | |
772 | ||
773 | static int get_process_ctty_atime(pid_t pid, usec_t *atime) { | |
774 | _cleanup_free_ char *p = NULL; | |
775 | int r; | |
776 | ||
777 | assert(pid > 0); | |
778 | assert(atime); | |
779 | ||
780 | r = get_ctty(pid, NULL, &p); | |
781 | if (r < 0) | |
782 | return r; | |
783 | ||
784 | return get_tty_atime(p, atime); | |
785 | } | |
786 | ||
787 | int session_get_idle_hint(Session *s, dual_timestamp *t) { | |
788 | usec_t atime = 0, n; | |
789 | int r; | |
790 | ||
791 | assert(s); | |
792 | ||
793 | /* Explicit idle hint is set */ | |
794 | if (s->idle_hint) { | |
795 | if (t) | |
796 | *t = s->idle_hint_timestamp; | |
797 | ||
798 | return s->idle_hint; | |
799 | } | |
800 | ||
801 | /* Graphical sessions should really implement a real | |
802 | * idle hint logic */ | |
803 | if (s->display) | |
804 | goto dont_know; | |
805 | ||
806 | /* For sessions with an explicitly configured tty, let's check | |
807 | * its atime */ | |
808 | if (s->tty) { | |
809 | r = get_tty_atime(s->tty, &atime); | |
810 | if (r >= 0) | |
811 | goto found_atime; | |
812 | } | |
813 | ||
814 | /* For sessions with a leader but no explicitly configured | |
815 | * tty, let's check the controlling tty of the leader */ | |
816 | if (s->leader > 0) { | |
817 | r = get_process_ctty_atime(s->leader, &atime); | |
818 | if (r >= 0) | |
819 | goto found_atime; | |
820 | } | |
821 | ||
822 | dont_know: | |
823 | if (t) | |
824 | *t = s->idle_hint_timestamp; | |
825 | ||
826 | return 0; | |
827 | ||
828 | found_atime: | |
829 | if (t) | |
830 | dual_timestamp_from_realtime(t, atime); | |
831 | ||
832 | n = now(CLOCK_REALTIME); | |
833 | ||
834 | if (s->manager->idle_action_usec <= 0) | |
835 | return 0; | |
836 | ||
837 | return atime + s->manager->idle_action_usec <= n; | |
838 | } | |
839 | ||
840 | void session_set_idle_hint(Session *s, bool b) { | |
841 | assert(s); | |
842 | ||
843 | if (s->idle_hint == b) | |
844 | return; | |
845 | ||
846 | s->idle_hint = b; | |
847 | dual_timestamp_get(&s->idle_hint_timestamp); | |
848 | ||
849 | session_send_changed(s, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); | |
850 | ||
851 | if (s->seat) | |
852 | seat_send_changed(s->seat, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); | |
853 | ||
854 | user_send_changed(s->user, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); | |
855 | manager_send_changed(s->manager, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); | |
856 | } | |
857 | ||
858 | static int session_dispatch_fifo(sd_event_source *es, int fd, uint32_t revents, void *userdata) { | |
859 | Session *s = userdata; | |
860 | ||
861 | assert(s); | |
862 | assert(s->fifo_fd == fd); | |
863 | ||
864 | /* EOF on the FIFO means the session died abnormally. */ | |
865 | ||
866 | session_remove_fifo(s); | |
867 | session_stop(s, false); | |
868 | ||
869 | return 1; | |
870 | } | |
871 | ||
872 | int session_create_fifo(Session *s) { | |
873 | int r; | |
874 | ||
875 | assert(s); | |
876 | ||
877 | /* Create FIFO */ | |
878 | if (!s->fifo_path) { | |
879 | r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0); | |
880 | if (r < 0) | |
881 | return r; | |
882 | ||
883 | if (asprintf(&s->fifo_path, "/run/systemd/sessions/%s.ref", s->id) < 0) | |
884 | return -ENOMEM; | |
885 | ||
886 | if (mkfifo(s->fifo_path, 0600) < 0 && errno != EEXIST) | |
887 | return -errno; | |
888 | } | |
889 | ||
890 | /* Open reading side */ | |
891 | if (s->fifo_fd < 0) { | |
892 | s->fifo_fd = open(s->fifo_path, O_RDONLY|O_CLOEXEC|O_NDELAY); | |
893 | if (s->fifo_fd < 0) | |
894 | return -errno; | |
895 | ||
896 | } | |
897 | ||
898 | if (!s->fifo_event_source) { | |
899 | r = sd_event_add_io(s->manager->event, &s->fifo_event_source, s->fifo_fd, 0, session_dispatch_fifo, s); | |
900 | if (r < 0) | |
901 | return r; | |
902 | ||
903 | r = sd_event_source_set_priority(s->fifo_event_source, SD_EVENT_PRIORITY_IDLE); | |
904 | if (r < 0) | |
905 | return r; | |
906 | } | |
907 | ||
908 | /* Open writing side */ | |
909 | r = open(s->fifo_path, O_WRONLY|O_CLOEXEC|O_NDELAY); | |
910 | if (r < 0) | |
911 | return -errno; | |
912 | ||
913 | return r; | |
914 | } | |
915 | ||
916 | static void session_remove_fifo(Session *s) { | |
917 | assert(s); | |
918 | ||
919 | s->fifo_event_source = sd_event_source_unref(s->fifo_event_source); | |
920 | s->fifo_fd = safe_close(s->fifo_fd); | |
921 | ||
922 | if (s->fifo_path) { | |
923 | unlink(s->fifo_path); | |
924 | s->fifo_path = mfree(s->fifo_path); | |
925 | } | |
926 | } | |
927 | ||
928 | bool session_check_gc(Session *s, bool drop_not_started) { | |
929 | assert(s); | |
930 | ||
931 | if (drop_not_started && !s->started) | |
932 | return false; | |
933 | ||
934 | if (!s->user) | |
935 | return false; | |
936 | ||
937 | if (s->fifo_fd >= 0) { | |
938 | if (pipe_eof(s->fifo_fd) <= 0) | |
939 | return true; | |
940 | } | |
941 | ||
942 | if (s->scope_job && manager_job_is_active(s->manager, s->scope_job)) | |
943 | return true; | |
944 | ||
945 | if (s->scope && manager_unit_is_active(s->manager, s->scope)) | |
946 | return true; | |
947 | ||
948 | return false; | |
949 | } | |
950 | ||
951 | void session_add_to_gc_queue(Session *s) { | |
952 | assert(s); | |
953 | ||
954 | if (s->in_gc_queue) | |
955 | return; | |
956 | ||
957 | LIST_PREPEND(gc_queue, s->manager->session_gc_queue, s); | |
958 | s->in_gc_queue = true; | |
959 | } | |
960 | ||
961 | SessionState session_get_state(Session *s) { | |
962 | assert(s); | |
963 | ||
964 | /* always check closing first */ | |
965 | if (s->stopping || s->timer_event_source) | |
966 | return SESSION_CLOSING; | |
967 | ||
968 | if (s->scope_job || s->fifo_fd < 0) | |
969 | return SESSION_OPENING; | |
970 | ||
971 | if (session_is_active(s)) | |
972 | return SESSION_ACTIVE; | |
973 | ||
974 | return SESSION_ONLINE; | |
975 | } | |
976 | ||
977 | int session_kill(Session *s, KillWho who, int signo) { | |
978 | assert(s); | |
979 | ||
980 | if (!s->scope) | |
981 | return -ESRCH; | |
982 | ||
983 | return manager_kill_unit(s->manager, s->scope, who, signo, NULL); | |
984 | } | |
985 | ||
986 | static int session_open_vt(Session *s) { | |
987 | char path[sizeof("/dev/tty") + DECIMAL_STR_MAX(s->vtnr)]; | |
988 | ||
989 | if (s->vtnr < 1) | |
990 | return -ENODEV; | |
991 | ||
992 | if (s->vtfd >= 0) | |
993 | return s->vtfd; | |
994 | ||
995 | sprintf(path, "/dev/tty%u", s->vtnr); | |
996 | s->vtfd = open_terminal(path, O_RDWR | O_CLOEXEC | O_NONBLOCK | O_NOCTTY); | |
997 | if (s->vtfd < 0) | |
998 | return log_error_errno(errno, "cannot open VT %s of session %s: %m", path, s->id); | |
999 | ||
1000 | return s->vtfd; | |
1001 | } | |
1002 | ||
1003 | int session_prepare_vt(Session *s) { | |
1004 | int vt, r; | |
1005 | struct vt_mode mode = { 0 }; | |
1006 | ||
1007 | if (s->vtnr < 1) | |
1008 | return 0; | |
1009 | ||
1010 | vt = session_open_vt(s); | |
1011 | if (vt < 0) | |
1012 | return vt; | |
1013 | ||
1014 | r = fchown(vt, s->user->uid, -1); | |
1015 | if (r < 0) { | |
1016 | r = log_error_errno(errno, | |
1017 | "Cannot change owner of /dev/tty%u: %m", | |
1018 | s->vtnr); | |
1019 | goto error; | |
1020 | } | |
1021 | ||
1022 | r = ioctl(vt, KDSKBMODE, K_OFF); | |
1023 | if (r < 0) { | |
1024 | r = log_error_errno(errno, | |
1025 | "Cannot set K_OFF on /dev/tty%u: %m", | |
1026 | s->vtnr); | |
1027 | goto error; | |
1028 | } | |
1029 | ||
1030 | r = ioctl(vt, KDSETMODE, KD_GRAPHICS); | |
1031 | if (r < 0) { | |
1032 | r = log_error_errno(errno, | |
1033 | "Cannot set KD_GRAPHICS on /dev/tty%u: %m", | |
1034 | s->vtnr); | |
1035 | goto error; | |
1036 | } | |
1037 | ||
1038 | /* Oh, thanks to the VT layer, VT_AUTO does not work with KD_GRAPHICS. | |
1039 | * So we need a dummy handler here which just acknowledges *all* VT | |
1040 | * switch requests. */ | |
1041 | mode.mode = VT_PROCESS; | |
1042 | mode.relsig = SIGRTMIN; | |
1043 | mode.acqsig = SIGRTMIN + 1; | |
1044 | r = ioctl(vt, VT_SETMODE, &mode); | |
1045 | if (r < 0) { | |
1046 | r = log_error_errno(errno, | |
1047 | "Cannot set VT_PROCESS on /dev/tty%u: %m", | |
1048 | s->vtnr); | |
1049 | goto error; | |
1050 | } | |
1051 | ||
1052 | return 0; | |
1053 | ||
1054 | error: | |
1055 | session_restore_vt(s); | |
1056 | return r; | |
1057 | } | |
1058 | ||
1059 | void session_restore_vt(Session *s) { | |
1060 | ||
1061 | static const struct vt_mode mode = { | |
1062 | .mode = VT_AUTO, | |
1063 | }; | |
1064 | ||
1065 | _cleanup_free_ char *utf8 = NULL; | |
1066 | int vt, kb, old_fd; | |
1067 | ||
1068 | /* We need to get a fresh handle to the virtual terminal, | |
1069 | * since the old file-descriptor is potentially in a hung-up | |
1070 | * state after the controlling process exited; we do a | |
1071 | * little dance to avoid having the terminal be available | |
1072 | * for reuse before we've cleaned it up. | |
1073 | */ | |
1074 | old_fd = s->vtfd; | |
1075 | s->vtfd = -1; | |
1076 | ||
1077 | vt = session_open_vt(s); | |
1078 | safe_close(old_fd); | |
1079 | ||
1080 | if (vt < 0) | |
1081 | return; | |
1082 | ||
1083 | (void) ioctl(vt, KDSETMODE, KD_TEXT); | |
1084 | ||
1085 | if (read_one_line_file("/sys/module/vt/parameters/default_utf8", &utf8) >= 0 && *utf8 == '1') | |
1086 | kb = K_UNICODE; | |
1087 | else | |
1088 | kb = K_XLATE; | |
1089 | ||
1090 | (void) ioctl(vt, KDSKBMODE, kb); | |
1091 | ||
1092 | (void) ioctl(vt, VT_SETMODE, &mode); | |
1093 | (void) fchown(vt, 0, (gid_t) -1); | |
1094 | ||
1095 | s->vtfd = safe_close(s->vtfd); | |
1096 | } | |
1097 | ||
1098 | void session_leave_vt(Session *s) { | |
1099 | int r; | |
1100 | ||
1101 | assert(s); | |
1102 | ||
1103 | /* This is called whenever we get a VT-switch signal from the kernel. | |
1104 | * We acknowledge all of them unconditionally. Note that session are | |
1105 | * free to overwrite those handlers and we only register them for | |
1106 | * sessions with controllers. Legacy sessions are not affected. | |
1107 | * However, if we switch from a non-legacy to a legacy session, we must | |
1108 | * make sure to pause all device before acknowledging the switch. We | |
1109 | * process the real switch only after we are notified via sysfs, so the | |
1110 | * legacy session might have already started using the devices. If we | |
1111 | * don't pause the devices before the switch, we might confuse the | |
1112 | * session we switch to. */ | |
1113 | ||
1114 | if (s->vtfd < 0) | |
1115 | return; | |
1116 | ||
1117 | session_device_pause_all(s); | |
1118 | r = ioctl(s->vtfd, VT_RELDISP, 1); | |
1119 | if (r < 0) | |
1120 | log_debug_errno(errno, "Cannot release VT of session %s: %m", s->id); | |
1121 | } | |
1122 | ||
1123 | bool session_is_controller(Session *s, const char *sender) { | |
1124 | assert(s); | |
1125 | ||
1126 | return streq_ptr(s->controller, sender); | |
1127 | } | |
1128 | ||
1129 | static void session_release_controller(Session *s, bool notify) { | |
1130 | _cleanup_free_ char *name = NULL; | |
1131 | SessionDevice *sd; | |
1132 | ||
1133 | if (!s->controller) | |
1134 | return; | |
1135 | ||
1136 | name = s->controller; | |
1137 | ||
1138 | /* By resetting the controller before releasing the devices, we won't | |
1139 | * send notification signals. This avoids sending useless notifications | |
1140 | * if the controller is released on disconnects. */ | |
1141 | if (!notify) | |
1142 | s->controller = NULL; | |
1143 | ||
1144 | while ((sd = hashmap_first(s->devices))) | |
1145 | session_device_free(sd); | |
1146 | ||
1147 | s->controller = NULL; | |
1148 | s->track = sd_bus_track_unref(s->track); | |
1149 | } | |
1150 | ||
1151 | static int on_bus_track(sd_bus_track *track, void *userdata) { | |
1152 | Session *s = userdata; | |
1153 | ||
1154 | assert(track); | |
1155 | assert(s); | |
1156 | ||
1157 | session_drop_controller(s); | |
1158 | ||
1159 | return 0; | |
1160 | } | |
1161 | ||
1162 | int session_set_controller(Session *s, const char *sender, bool force) { | |
1163 | _cleanup_free_ char *name = NULL; | |
1164 | int r; | |
1165 | ||
1166 | assert(s); | |
1167 | assert(sender); | |
1168 | ||
1169 | if (session_is_controller(s, sender)) | |
1170 | return 0; | |
1171 | if (s->controller && !force) | |
1172 | return -EBUSY; | |
1173 | ||
1174 | name = strdup(sender); | |
1175 | if (!name) | |
1176 | return -ENOMEM; | |
1177 | ||
1178 | s->track = sd_bus_track_unref(s->track); | |
1179 | r = sd_bus_track_new(s->manager->bus, &s->track, on_bus_track, s); | |
1180 | if (r < 0) | |
1181 | return r; | |
1182 | ||
1183 | r = sd_bus_track_add_name(s->track, name); | |
1184 | if (r < 0) | |
1185 | return r; | |
1186 | ||
1187 | /* When setting a session controller, we forcibly mute the VT and set | |
1188 | * it into graphics-mode. Applications can override that by changing | |
1189 | * VT state after calling TakeControl(). However, this serves as a good | |
1190 | * default and well-behaving controllers can now ignore VTs entirely. | |
1191 | * Note that we reset the VT on ReleaseControl() and if the controller | |
1192 | * exits. | |
1193 | * If logind crashes/restarts, we restore the controller during restart | |
1194 | * or reset the VT in case it crashed/exited, too. */ | |
1195 | r = session_prepare_vt(s); | |
1196 | if (r < 0) { | |
1197 | s->track = sd_bus_track_unref(s->track); | |
1198 | return r; | |
1199 | } | |
1200 | ||
1201 | session_release_controller(s, true); | |
1202 | s->controller = name; | |
1203 | name = NULL; | |
1204 | session_save(s); | |
1205 | ||
1206 | return 0; | |
1207 | } | |
1208 | ||
1209 | void session_drop_controller(Session *s) { | |
1210 | assert(s); | |
1211 | ||
1212 | if (!s->controller) | |
1213 | return; | |
1214 | ||
1215 | s->track = sd_bus_track_unref(s->track); | |
1216 | session_release_controller(s, false); | |
1217 | session_save(s); | |
1218 | session_restore_vt(s); | |
1219 | } | |
1220 | ||
1221 | static const char* const session_state_table[_SESSION_STATE_MAX] = { | |
1222 | [SESSION_OPENING] = "opening", | |
1223 | [SESSION_ONLINE] = "online", | |
1224 | [SESSION_ACTIVE] = "active", | |
1225 | [SESSION_CLOSING] = "closing" | |
1226 | }; | |
1227 | ||
1228 | DEFINE_STRING_TABLE_LOOKUP(session_state, SessionState); | |
1229 | ||
1230 | static const char* const session_type_table[_SESSION_TYPE_MAX] = { | |
1231 | [SESSION_UNSPECIFIED] = "unspecified", | |
1232 | [SESSION_TTY] = "tty", | |
1233 | [SESSION_X11] = "x11", | |
1234 | [SESSION_WAYLAND] = "wayland", | |
1235 | [SESSION_MIR] = "mir", | |
1236 | [SESSION_WEB] = "web", | |
1237 | }; | |
1238 | ||
1239 | DEFINE_STRING_TABLE_LOOKUP(session_type, SessionType); | |
1240 | ||
1241 | static const char* const session_class_table[_SESSION_CLASS_MAX] = { | |
1242 | [SESSION_USER] = "user", | |
1243 | [SESSION_GREETER] = "greeter", | |
1244 | [SESSION_LOCK_SCREEN] = "lock-screen", | |
1245 | [SESSION_BACKGROUND] = "background" | |
1246 | }; | |
1247 | ||
1248 | DEFINE_STRING_TABLE_LOOKUP(session_class, SessionClass); | |
1249 | ||
1250 | static const char* const kill_who_table[_KILL_WHO_MAX] = { | |
1251 | [KILL_LEADER] = "leader", | |
1252 | [KILL_ALL] = "all" | |
1253 | }; | |
1254 | ||
1255 | DEFINE_STRING_TABLE_LOOKUP(kill_who, KillWho); |