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1 | /* SPDX-License-Identifier: LGPL-2.1+ */ | |
2 | ||
3 | #include <errno.h> | |
4 | #include <fcntl.h> | |
5 | #include <linux/kd.h> | |
6 | #include <linux/vt.h> | |
7 | #include <signal.h> | |
8 | #include <sys/ioctl.h> | |
9 | #include <sys/stat.h> | |
10 | #include <unistd.h> | |
11 | ||
12 | #include "sd-messages.h" | |
13 | ||
14 | #include "alloc-util.h" | |
15 | #include "audit-util.h" | |
16 | #include "bus-error.h" | |
17 | #include "bus-util.h" | |
18 | #include "env-file.h" | |
19 | #include "escape.h" | |
20 | #include "fd-util.h" | |
21 | #include "fileio.h" | |
22 | #include "format-util.h" | |
23 | #include "io-util.h" | |
24 | #include "logind-dbus.h" | |
25 | #include "logind-seat-dbus.h" | |
26 | #include "logind-session-dbus.h" | |
27 | #include "logind-session.h" | |
28 | #include "logind-user-dbus.h" | |
29 | #include "mkdir.h" | |
30 | #include "parse-util.h" | |
31 | #include "path-util.h" | |
32 | #include "process-util.h" | |
33 | #include "serialize.h" | |
34 | #include "string-table.h" | |
35 | #include "strv.h" | |
36 | #include "terminal-util.h" | |
37 | #include "tmpfile-util.h" | |
38 | #include "user-util.h" | |
39 | #include "util.h" | |
40 | ||
41 | #define RELEASE_USEC (20*USEC_PER_SEC) | |
42 | ||
43 | static void session_remove_fifo(Session *s); | |
44 | static void session_restore_vt(Session *s); | |
45 | ||
46 | int session_new(Session **ret, Manager *m, const char *id) { | |
47 | _cleanup_(session_freep) Session *s = NULL; | |
48 | int r; | |
49 | ||
50 | assert(ret); | |
51 | assert(m); | |
52 | assert(id); | |
53 | ||
54 | if (!session_id_valid(id)) | |
55 | return -EINVAL; | |
56 | ||
57 | s = new(Session, 1); | |
58 | if (!s) | |
59 | return -ENOMEM; | |
60 | ||
61 | *s = (Session) { | |
62 | .manager = m, | |
63 | .fifo_fd = -1, | |
64 | .vtfd = -1, | |
65 | .audit_id = AUDIT_SESSION_INVALID, | |
66 | .tty_validity = _TTY_VALIDITY_INVALID, | |
67 | }; | |
68 | ||
69 | s->state_file = path_join("/run/systemd/sessions", id); | |
70 | if (!s->state_file) | |
71 | return -ENOMEM; | |
72 | ||
73 | s->id = basename(s->state_file); | |
74 | ||
75 | s->devices = hashmap_new(&devt_hash_ops); | |
76 | if (!s->devices) | |
77 | return -ENOMEM; | |
78 | ||
79 | r = hashmap_put(m->sessions, s->id, s); | |
80 | if (r < 0) | |
81 | return r; | |
82 | ||
83 | *ret = TAKE_PTR(s); | |
84 | return 0; | |
85 | } | |
86 | ||
87 | Session* session_free(Session *s) { | |
88 | SessionDevice *sd; | |
89 | ||
90 | if (!s) | |
91 | return NULL; | |
92 | ||
93 | if (s->in_gc_queue) | |
94 | LIST_REMOVE(gc_queue, s->manager->session_gc_queue, s); | |
95 | ||
96 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); | |
97 | ||
98 | session_drop_controller(s); | |
99 | ||
100 | while ((sd = hashmap_first(s->devices))) | |
101 | session_device_free(sd); | |
102 | ||
103 | hashmap_free(s->devices); | |
104 | ||
105 | if (s->user) { | |
106 | LIST_REMOVE(sessions_by_user, s->user->sessions, s); | |
107 | ||
108 | if (s->user->display == s) | |
109 | s->user->display = NULL; | |
110 | ||
111 | user_update_last_session_timer(s->user); | |
112 | } | |
113 | ||
114 | if (s->seat) { | |
115 | if (s->seat->active == s) | |
116 | s->seat->active = NULL; | |
117 | if (s->seat->pending_switch == s) | |
118 | s->seat->pending_switch = NULL; | |
119 | ||
120 | seat_evict_position(s->seat, s); | |
121 | LIST_REMOVE(sessions_by_seat, s->seat->sessions, s); | |
122 | } | |
123 | ||
124 | if (s->scope) { | |
125 | hashmap_remove(s->manager->session_units, s->scope); | |
126 | free(s->scope); | |
127 | } | |
128 | ||
129 | if (pid_is_valid(s->leader)) | |
130 | (void) hashmap_remove_value(s->manager->sessions_by_leader, PID_TO_PTR(s->leader), s); | |
131 | ||
132 | free(s->scope_job); | |
133 | ||
134 | sd_bus_message_unref(s->create_message); | |
135 | ||
136 | free(s->tty); | |
137 | free(s->display); | |
138 | free(s->remote_host); | |
139 | free(s->remote_user); | |
140 | free(s->service); | |
141 | free(s->desktop); | |
142 | ||
143 | hashmap_remove(s->manager->sessions, s->id); | |
144 | ||
145 | sd_event_source_unref(s->fifo_event_source); | |
146 | safe_close(s->fifo_fd); | |
147 | ||
148 | /* Note that we remove neither the state file nor the fifo path here, since we want both to survive | |
149 | * daemon restarts */ | |
150 | free(s->state_file); | |
151 | free(s->fifo_path); | |
152 | ||
153 | return mfree(s); | |
154 | } | |
155 | ||
156 | void session_set_user(Session *s, User *u) { | |
157 | assert(s); | |
158 | assert(!s->user); | |
159 | ||
160 | s->user = u; | |
161 | LIST_PREPEND(sessions_by_user, u->sessions, s); | |
162 | ||
163 | user_update_last_session_timer(u); | |
164 | } | |
165 | ||
166 | int session_set_leader(Session *s, pid_t pid) { | |
167 | int r; | |
168 | ||
169 | assert(s); | |
170 | ||
171 | if (!pid_is_valid(pid)) | |
172 | return -EINVAL; | |
173 | ||
174 | if (s->leader == pid) | |
175 | return 0; | |
176 | ||
177 | r = hashmap_put(s->manager->sessions_by_leader, PID_TO_PTR(pid), s); | |
178 | if (r < 0) | |
179 | return r; | |
180 | ||
181 | if (pid_is_valid(s->leader)) | |
182 | (void) hashmap_remove_value(s->manager->sessions_by_leader, PID_TO_PTR(s->leader), s); | |
183 | ||
184 | s->leader = pid; | |
185 | (void) audit_session_from_pid(pid, &s->audit_id); | |
186 | ||
187 | return 1; | |
188 | } | |
189 | ||
190 | static void session_save_devices(Session *s, FILE *f) { | |
191 | SessionDevice *sd; | |
192 | Iterator i; | |
193 | ||
194 | if (!hashmap_isempty(s->devices)) { | |
195 | fprintf(f, "DEVICES="); | |
196 | HASHMAP_FOREACH(sd, s->devices, i) | |
197 | fprintf(f, "%u:%u ", major(sd->dev), minor(sd->dev)); | |
198 | fprintf(f, "\n"); | |
199 | } | |
200 | } | |
201 | ||
202 | int session_save(Session *s) { | |
203 | _cleanup_free_ char *temp_path = NULL; | |
204 | _cleanup_fclose_ FILE *f = NULL; | |
205 | int r = 0; | |
206 | ||
207 | assert(s); | |
208 | ||
209 | if (!s->user) | |
210 | return -ESTALE; | |
211 | ||
212 | if (!s->started) | |
213 | return 0; | |
214 | ||
215 | r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0, MKDIR_WARN_MODE); | |
216 | if (r < 0) | |
217 | goto fail; | |
218 | ||
219 | r = fopen_temporary(s->state_file, &f, &temp_path); | |
220 | if (r < 0) | |
221 | goto fail; | |
222 | ||
223 | (void) fchmod(fileno(f), 0644); | |
224 | ||
225 | fprintf(f, | |
226 | "# This is private data. Do not parse.\n" | |
227 | "UID="UID_FMT"\n" | |
228 | "USER=%s\n" | |
229 | "ACTIVE=%i\n" | |
230 | "IS_DISPLAY=%i\n" | |
231 | "STATE=%s\n" | |
232 | "REMOTE=%i\n", | |
233 | s->user->user_record->uid, | |
234 | s->user->user_record->user_name, | |
235 | session_is_active(s), | |
236 | s->user->display == s, | |
237 | session_state_to_string(session_get_state(s)), | |
238 | s->remote); | |
239 | ||
240 | if (s->type >= 0) | |
241 | fprintf(f, "TYPE=%s\n", session_type_to_string(s->type)); | |
242 | ||
243 | if (s->original_type >= 0) | |
244 | fprintf(f, "ORIGINAL_TYPE=%s\n", session_type_to_string(s->original_type)); | |
245 | ||
246 | if (s->class >= 0) | |
247 | fprintf(f, "CLASS=%s\n", session_class_to_string(s->class)); | |
248 | ||
249 | if (s->scope) | |
250 | fprintf(f, "SCOPE=%s\n", s->scope); | |
251 | if (s->scope_job) | |
252 | fprintf(f, "SCOPE_JOB=%s\n", s->scope_job); | |
253 | ||
254 | if (s->fifo_path) | |
255 | fprintf(f, "FIFO=%s\n", s->fifo_path); | |
256 | ||
257 | if (s->seat) | |
258 | fprintf(f, "SEAT=%s\n", s->seat->id); | |
259 | ||
260 | if (s->tty) | |
261 | fprintf(f, "TTY=%s\n", s->tty); | |
262 | ||
263 | if (s->tty_validity >= 0) | |
264 | fprintf(f, "TTY_VALIDITY=%s\n", tty_validity_to_string(s->tty_validity)); | |
265 | ||
266 | if (s->display) | |
267 | fprintf(f, "DISPLAY=%s\n", s->display); | |
268 | ||
269 | if (s->remote_host) { | |
270 | _cleanup_free_ char *escaped; | |
271 | ||
272 | escaped = cescape(s->remote_host); | |
273 | if (!escaped) { | |
274 | r = -ENOMEM; | |
275 | goto fail; | |
276 | } | |
277 | ||
278 | fprintf(f, "REMOTE_HOST=%s\n", escaped); | |
279 | } | |
280 | ||
281 | if (s->remote_user) { | |
282 | _cleanup_free_ char *escaped; | |
283 | ||
284 | escaped = cescape(s->remote_user); | |
285 | if (!escaped) { | |
286 | r = -ENOMEM; | |
287 | goto fail; | |
288 | } | |
289 | ||
290 | fprintf(f, "REMOTE_USER=%s\n", escaped); | |
291 | } | |
292 | ||
293 | if (s->service) { | |
294 | _cleanup_free_ char *escaped; | |
295 | ||
296 | escaped = cescape(s->service); | |
297 | if (!escaped) { | |
298 | r = -ENOMEM; | |
299 | goto fail; | |
300 | } | |
301 | ||
302 | fprintf(f, "SERVICE=%s\n", escaped); | |
303 | } | |
304 | ||
305 | if (s->desktop) { | |
306 | _cleanup_free_ char *escaped; | |
307 | ||
308 | escaped = cescape(s->desktop); | |
309 | if (!escaped) { | |
310 | r = -ENOMEM; | |
311 | goto fail; | |
312 | } | |
313 | ||
314 | fprintf(f, "DESKTOP=%s\n", escaped); | |
315 | } | |
316 | ||
317 | if (s->seat && seat_has_vts(s->seat)) | |
318 | fprintf(f, "VTNR=%u\n", s->vtnr); | |
319 | ||
320 | if (!s->vtnr) | |
321 | fprintf(f, "POSITION=%u\n", s->position); | |
322 | ||
323 | if (pid_is_valid(s->leader)) | |
324 | fprintf(f, "LEADER="PID_FMT"\n", s->leader); | |
325 | ||
326 | if (audit_session_is_valid(s->audit_id)) | |
327 | fprintf(f, "AUDIT=%"PRIu32"\n", s->audit_id); | |
328 | ||
329 | if (dual_timestamp_is_set(&s->timestamp)) | |
330 | fprintf(f, | |
331 | "REALTIME="USEC_FMT"\n" | |
332 | "MONOTONIC="USEC_FMT"\n", | |
333 | s->timestamp.realtime, | |
334 | s->timestamp.monotonic); | |
335 | ||
336 | if (s->controller) { | |
337 | fprintf(f, "CONTROLLER=%s\n", s->controller); | |
338 | session_save_devices(s, f); | |
339 | } | |
340 | ||
341 | r = fflush_and_check(f); | |
342 | if (r < 0) | |
343 | goto fail; | |
344 | ||
345 | if (rename(temp_path, s->state_file) < 0) { | |
346 | r = -errno; | |
347 | goto fail; | |
348 | } | |
349 | ||
350 | return 0; | |
351 | ||
352 | fail: | |
353 | (void) unlink(s->state_file); | |
354 | ||
355 | if (temp_path) | |
356 | (void) unlink(temp_path); | |
357 | ||
358 | return log_error_errno(r, "Failed to save session data %s: %m", s->state_file); | |
359 | } | |
360 | ||
361 | static int session_load_devices(Session *s, const char *devices) { | |
362 | const char *p; | |
363 | int r = 0; | |
364 | ||
365 | assert(s); | |
366 | ||
367 | for (p = devices;;) { | |
368 | _cleanup_free_ char *word = NULL; | |
369 | SessionDevice *sd; | |
370 | dev_t dev; | |
371 | int k; | |
372 | ||
373 | k = extract_first_word(&p, &word, NULL, 0); | |
374 | if (k == 0) | |
375 | break; | |
376 | if (k < 0) { | |
377 | r = k; | |
378 | break; | |
379 | } | |
380 | ||
381 | k = parse_dev(word, &dev); | |
382 | if (k < 0) { | |
383 | r = k; | |
384 | continue; | |
385 | } | |
386 | ||
387 | /* The file descriptors for loaded devices will be reattached later. */ | |
388 | k = session_device_new(s, dev, false, &sd); | |
389 | if (k < 0) | |
390 | r = k; | |
391 | } | |
392 | ||
393 | if (r < 0) | |
394 | log_error_errno(r, "Loading session devices for session %s failed: %m", s->id); | |
395 | ||
396 | return r; | |
397 | } | |
398 | ||
399 | int session_load(Session *s) { | |
400 | _cleanup_free_ char *remote = NULL, | |
401 | *seat = NULL, | |
402 | *tty_validity = NULL, | |
403 | *vtnr = NULL, | |
404 | *state = NULL, | |
405 | *position = NULL, | |
406 | *leader = NULL, | |
407 | *type = NULL, | |
408 | *original_type = NULL, | |
409 | *class = NULL, | |
410 | *uid = NULL, | |
411 | *realtime = NULL, | |
412 | *monotonic = NULL, | |
413 | *controller = NULL, | |
414 | *active = NULL, | |
415 | *devices = NULL, | |
416 | *is_display = NULL; | |
417 | ||
418 | int k, r; | |
419 | ||
420 | assert(s); | |
421 | ||
422 | r = parse_env_file(NULL, s->state_file, | |
423 | "REMOTE", &remote, | |
424 | "SCOPE", &s->scope, | |
425 | "SCOPE_JOB", &s->scope_job, | |
426 | "FIFO", &s->fifo_path, | |
427 | "SEAT", &seat, | |
428 | "TTY", &s->tty, | |
429 | "TTY_VALIDITY", &tty_validity, | |
430 | "DISPLAY", &s->display, | |
431 | "REMOTE_HOST", &s->remote_host, | |
432 | "REMOTE_USER", &s->remote_user, | |
433 | "SERVICE", &s->service, | |
434 | "DESKTOP", &s->desktop, | |
435 | "VTNR", &vtnr, | |
436 | "STATE", &state, | |
437 | "POSITION", &position, | |
438 | "LEADER", &leader, | |
439 | "TYPE", &type, | |
440 | "ORIGINAL_TYPE", &original_type, | |
441 | "CLASS", &class, | |
442 | "UID", &uid, | |
443 | "REALTIME", &realtime, | |
444 | "MONOTONIC", &monotonic, | |
445 | "CONTROLLER", &controller, | |
446 | "ACTIVE", &active, | |
447 | "DEVICES", &devices, | |
448 | "IS_DISPLAY", &is_display); | |
449 | ||
450 | if (r < 0) | |
451 | return log_error_errno(r, "Failed to read %s: %m", s->state_file); | |
452 | ||
453 | if (!s->user) { | |
454 | uid_t u; | |
455 | User *user; | |
456 | ||
457 | if (!uid) | |
458 | return log_error_errno(SYNTHETIC_ERRNO(ENOENT), | |
459 | "UID not specified for session %s", | |
460 | s->id); | |
461 | ||
462 | r = parse_uid(uid, &u); | |
463 | if (r < 0) { | |
464 | log_error("Failed to parse UID value %s for session %s.", uid, s->id); | |
465 | return r; | |
466 | } | |
467 | ||
468 | user = hashmap_get(s->manager->users, UID_TO_PTR(u)); | |
469 | if (!user) | |
470 | return log_error_errno(SYNTHETIC_ERRNO(ENOENT), | |
471 | "User of session %s not known.", | |
472 | s->id); | |
473 | ||
474 | session_set_user(s, user); | |
475 | } | |
476 | ||
477 | if (remote) { | |
478 | k = parse_boolean(remote); | |
479 | if (k >= 0) | |
480 | s->remote = k; | |
481 | } | |
482 | ||
483 | if (vtnr) | |
484 | safe_atou(vtnr, &s->vtnr); | |
485 | ||
486 | if (seat && !s->seat) { | |
487 | Seat *o; | |
488 | ||
489 | o = hashmap_get(s->manager->seats, seat); | |
490 | if (o) | |
491 | r = seat_attach_session(o, s); | |
492 | if (!o || r < 0) | |
493 | log_error("Cannot attach session %s to seat %s", s->id, seat); | |
494 | } | |
495 | ||
496 | if (!s->seat || !seat_has_vts(s->seat)) | |
497 | s->vtnr = 0; | |
498 | ||
499 | if (position && s->seat) { | |
500 | unsigned npos; | |
501 | ||
502 | safe_atou(position, &npos); | |
503 | seat_claim_position(s->seat, s, npos); | |
504 | } | |
505 | ||
506 | if (tty_validity) { | |
507 | TTYValidity v; | |
508 | ||
509 | v = tty_validity_from_string(tty_validity); | |
510 | if (v < 0) | |
511 | log_debug("Failed to parse TTY validity: %s", tty_validity); | |
512 | else | |
513 | s->tty_validity = v; | |
514 | } | |
515 | ||
516 | if (leader) { | |
517 | pid_t pid; | |
518 | ||
519 | r = parse_pid(leader, &pid); | |
520 | if (r < 0) | |
521 | log_debug_errno(r, "Failed to parse leader PID of session: %s", leader); | |
522 | else { | |
523 | r = session_set_leader(s, pid); | |
524 | if (r < 0) | |
525 | log_warning_errno(r, "Failed to set session leader PID, ignoring: %m"); | |
526 | } | |
527 | } | |
528 | ||
529 | if (type) { | |
530 | SessionType t; | |
531 | ||
532 | t = session_type_from_string(type); | |
533 | if (t >= 0) | |
534 | s->type = t; | |
535 | } | |
536 | ||
537 | if (original_type) { | |
538 | SessionType ot; | |
539 | ||
540 | ot = session_type_from_string(original_type); | |
541 | if (ot >= 0) | |
542 | s->original_type = ot; | |
543 | } else | |
544 | /* Pre-v246 compat: initialize original_type if not set in the state file */ | |
545 | s->original_type = s->type; | |
546 | ||
547 | if (class) { | |
548 | SessionClass c; | |
549 | ||
550 | c = session_class_from_string(class); | |
551 | if (c >= 0) | |
552 | s->class = c; | |
553 | } | |
554 | ||
555 | if (state && streq(state, "closing")) | |
556 | s->stopping = true; | |
557 | ||
558 | if (s->fifo_path) { | |
559 | int fd; | |
560 | ||
561 | /* If we open an unopened pipe for reading we will not | |
562 | get an EOF. to trigger an EOF we hence open it for | |
563 | writing, but close it right away which then will | |
564 | trigger the EOF. This will happen immediately if no | |
565 | other process has the FIFO open for writing, i. e. | |
566 | when the session died before logind (re)started. */ | |
567 | ||
568 | fd = session_create_fifo(s); | |
569 | safe_close(fd); | |
570 | } | |
571 | ||
572 | if (realtime) | |
573 | (void) deserialize_usec(realtime, &s->timestamp.realtime); | |
574 | if (monotonic) | |
575 | (void) deserialize_usec(monotonic, &s->timestamp.monotonic); | |
576 | ||
577 | if (active) { | |
578 | k = parse_boolean(active); | |
579 | if (k >= 0) | |
580 | s->was_active = k; | |
581 | } | |
582 | ||
583 | if (is_display) { | |
584 | /* Note that when enumerating users are loaded before sessions, hence the display session to use is | |
585 | * something we have to store along with the session and not the user, as in that case we couldn't | |
586 | * apply it at the time we load the user. */ | |
587 | ||
588 | k = parse_boolean(is_display); | |
589 | if (k < 0) | |
590 | log_warning_errno(k, "Failed to parse IS_DISPLAY session property: %m"); | |
591 | else if (k > 0) | |
592 | s->user->display = s; | |
593 | } | |
594 | ||
595 | if (controller) { | |
596 | if (bus_name_has_owner(s->manager->bus, controller, NULL) > 0) { | |
597 | session_set_controller(s, controller, false, false); | |
598 | session_load_devices(s, devices); | |
599 | } else | |
600 | session_restore_vt(s); | |
601 | } | |
602 | ||
603 | return r; | |
604 | } | |
605 | ||
606 | int session_activate(Session *s) { | |
607 | unsigned num_pending; | |
608 | ||
609 | assert(s); | |
610 | assert(s->user); | |
611 | ||
612 | if (!s->seat) | |
613 | return -EOPNOTSUPP; | |
614 | ||
615 | if (s->seat->active == s) | |
616 | return 0; | |
617 | ||
618 | /* on seats with VTs, we let VTs manage session-switching */ | |
619 | if (seat_has_vts(s->seat)) { | |
620 | if (s->vtnr == 0) | |
621 | return -EOPNOTSUPP; | |
622 | ||
623 | return chvt(s->vtnr); | |
624 | } | |
625 | ||
626 | /* On seats without VTs, we implement session-switching in logind. We | |
627 | * try to pause all session-devices and wait until the session | |
628 | * controller acknowledged them. Once all devices are asleep, we simply | |
629 | * switch the active session and be done. | |
630 | * We save the session we want to switch to in seat->pending_switch and | |
631 | * seat_complete_switch() will perform the final switch. */ | |
632 | ||
633 | s->seat->pending_switch = s; | |
634 | ||
635 | /* if no devices are running, immediately perform the session switch */ | |
636 | num_pending = session_device_try_pause_all(s); | |
637 | if (!num_pending) | |
638 | seat_complete_switch(s->seat); | |
639 | ||
640 | return 0; | |
641 | } | |
642 | ||
643 | static int session_start_scope(Session *s, sd_bus_message *properties, sd_bus_error *error) { | |
644 | int r; | |
645 | ||
646 | assert(s); | |
647 | assert(s->user); | |
648 | ||
649 | if (!s->scope) { | |
650 | _cleanup_free_ char *scope = NULL; | |
651 | const char *description; | |
652 | ||
653 | s->scope_job = mfree(s->scope_job); | |
654 | ||
655 | scope = strjoin("session-", s->id, ".scope"); | |
656 | if (!scope) | |
657 | return log_oom(); | |
658 | ||
659 | description = strjoina("Session ", s->id, " of user ", s->user->user_record->user_name); | |
660 | ||
661 | r = manager_start_scope( | |
662 | s->manager, | |
663 | scope, | |
664 | s->leader, | |
665 | s->user->slice, | |
666 | description, | |
667 | /* These two have StopWhenUnneeded= set, hence add a dep towards them */ | |
668 | STRV_MAKE(s->user->runtime_dir_service, | |
669 | s->user->service), | |
670 | /* And order us after some more */ | |
671 | STRV_MAKE("systemd-logind.service", | |
672 | "systemd-user-sessions.service", | |
673 | s->user->runtime_dir_service, | |
674 | s->user->service), | |
675 | user_record_home_directory(s->user->user_record), | |
676 | properties, | |
677 | error, | |
678 | &s->scope_job); | |
679 | if (r < 0) | |
680 | return log_error_errno(r, "Failed to start session scope %s: %s", | |
681 | scope, bus_error_message(error, r)); | |
682 | ||
683 | s->scope = TAKE_PTR(scope); | |
684 | } | |
685 | ||
686 | (void) hashmap_put(s->manager->session_units, s->scope, s); | |
687 | ||
688 | return 0; | |
689 | } | |
690 | ||
691 | int session_start(Session *s, sd_bus_message *properties, sd_bus_error *error) { | |
692 | int r; | |
693 | ||
694 | assert(s); | |
695 | ||
696 | if (!s->user) | |
697 | return -ESTALE; | |
698 | ||
699 | if (s->stopping) | |
700 | return -EINVAL; | |
701 | ||
702 | if (s->started) | |
703 | return 0; | |
704 | ||
705 | r = user_start(s->user); | |
706 | if (r < 0) | |
707 | return r; | |
708 | ||
709 | r = session_start_scope(s, properties, error); | |
710 | if (r < 0) | |
711 | return r; | |
712 | ||
713 | log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO, | |
714 | "MESSAGE_ID=" SD_MESSAGE_SESSION_START_STR, | |
715 | "SESSION_ID=%s", s->id, | |
716 | "USER_ID=%s", s->user->user_record->user_name, | |
717 | "LEADER="PID_FMT, s->leader, | |
718 | LOG_MESSAGE("New session %s of user %s.", s->id, s->user->user_record->user_name)); | |
719 | ||
720 | if (!dual_timestamp_is_set(&s->timestamp)) | |
721 | dual_timestamp_get(&s->timestamp); | |
722 | ||
723 | if (s->seat) | |
724 | seat_read_active_vt(s->seat); | |
725 | ||
726 | s->started = true; | |
727 | ||
728 | user_elect_display(s->user); | |
729 | ||
730 | /* Save data */ | |
731 | session_save(s); | |
732 | user_save(s->user); | |
733 | if (s->seat) | |
734 | seat_save(s->seat); | |
735 | ||
736 | /* Send signals */ | |
737 | session_send_signal(s, true); | |
738 | user_send_changed(s->user, "Display", NULL); | |
739 | if (s->seat) { | |
740 | if (s->seat->active == s) | |
741 | seat_send_changed(s->seat, "ActiveSession", NULL); | |
742 | } | |
743 | ||
744 | return 0; | |
745 | } | |
746 | ||
747 | static int session_stop_scope(Session *s, bool force) { | |
748 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; | |
749 | int r; | |
750 | ||
751 | assert(s); | |
752 | ||
753 | if (!s->scope) | |
754 | return 0; | |
755 | ||
756 | /* Let's always abandon the scope first. This tells systemd that we are not interested anymore, and everything | |
757 | * that is left in the scope is "left-over". Informing systemd about this has the benefit that it will log | |
758 | * when killing any processes left after this point. */ | |
759 | r = manager_abandon_scope(s->manager, s->scope, &error); | |
760 | if (r < 0) { | |
761 | log_warning_errno(r, "Failed to abandon session scope, ignoring: %s", bus_error_message(&error, r)); | |
762 | sd_bus_error_free(&error); | |
763 | } | |
764 | ||
765 | s->scope_job = mfree(s->scope_job); | |
766 | ||
767 | /* Optionally, let's kill everything that's left now. */ | |
768 | if (force || | |
769 | (s->user->user_record->kill_processes != 0 && | |
770 | (s->user->user_record->kill_processes > 0 || | |
771 | manager_shall_kill(s->manager, s->user->user_record->user_name)))) { | |
772 | ||
773 | r = manager_stop_unit(s->manager, s->scope, &error, &s->scope_job); | |
774 | if (r < 0) { | |
775 | if (force) | |
776 | return log_error_errno(r, "Failed to stop session scope: %s", bus_error_message(&error, r)); | |
777 | ||
778 | log_warning_errno(r, "Failed to stop session scope, ignoring: %s", bus_error_message(&error, r)); | |
779 | } | |
780 | } else { | |
781 | ||
782 | /* With no killing, this session is allowed to persist in "closing" state indefinitely. | |
783 | * Therefore session stop and session removal may be two distinct events. | |
784 | * Session stop is quite significant on its own, let's log it. */ | |
785 | log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO, | |
786 | "SESSION_ID=%s", s->id, | |
787 | "USER_ID=%s", s->user->user_record->user_name, | |
788 | "LEADER="PID_FMT, s->leader, | |
789 | LOG_MESSAGE("Session %s logged out. Waiting for processes to exit.", s->id)); | |
790 | } | |
791 | ||
792 | return 0; | |
793 | } | |
794 | ||
795 | int session_stop(Session *s, bool force) { | |
796 | int r; | |
797 | ||
798 | assert(s); | |
799 | ||
800 | /* This is called whenever we begin with tearing down a session record. It's called in four cases: explicit API | |
801 | * request via the bus (either directly for the session object or for the seat or user object this session | |
802 | * belongs to; 'force' is true), or due to automatic GC (i.e. scope vanished; 'force' is false), or because the | |
803 | * session FIFO saw an EOF ('force' is false), or because the release timer hit ('force' is false). */ | |
804 | ||
805 | if (!s->user) | |
806 | return -ESTALE; | |
807 | if (!s->started) | |
808 | return 0; | |
809 | if (s->stopping) | |
810 | return 0; | |
811 | ||
812 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); | |
813 | ||
814 | if (s->seat) | |
815 | seat_evict_position(s->seat, s); | |
816 | ||
817 | /* We are going down, don't care about FIFOs anymore */ | |
818 | session_remove_fifo(s); | |
819 | ||
820 | /* Kill cgroup */ | |
821 | r = session_stop_scope(s, force); | |
822 | ||
823 | s->stopping = true; | |
824 | ||
825 | user_elect_display(s->user); | |
826 | ||
827 | session_save(s); | |
828 | user_save(s->user); | |
829 | ||
830 | return r; | |
831 | } | |
832 | ||
833 | int session_finalize(Session *s) { | |
834 | SessionDevice *sd; | |
835 | ||
836 | assert(s); | |
837 | ||
838 | if (!s->user) | |
839 | return -ESTALE; | |
840 | ||
841 | if (s->started) | |
842 | log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO, | |
843 | "MESSAGE_ID=" SD_MESSAGE_SESSION_STOP_STR, | |
844 | "SESSION_ID=%s", s->id, | |
845 | "USER_ID=%s", s->user->user_record->user_name, | |
846 | "LEADER="PID_FMT, s->leader, | |
847 | LOG_MESSAGE("Removed session %s.", s->id)); | |
848 | ||
849 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); | |
850 | ||
851 | if (s->seat) | |
852 | seat_evict_position(s->seat, s); | |
853 | ||
854 | /* Kill session devices */ | |
855 | while ((sd = hashmap_first(s->devices))) | |
856 | session_device_free(sd); | |
857 | ||
858 | (void) unlink(s->state_file); | |
859 | session_add_to_gc_queue(s); | |
860 | user_add_to_gc_queue(s->user); | |
861 | ||
862 | if (s->started) { | |
863 | session_send_signal(s, false); | |
864 | s->started = false; | |
865 | } | |
866 | ||
867 | if (s->seat) { | |
868 | if (s->seat->active == s) | |
869 | seat_set_active(s->seat, NULL); | |
870 | ||
871 | seat_save(s->seat); | |
872 | } | |
873 | ||
874 | user_save(s->user); | |
875 | user_send_changed(s->user, "Display", NULL); | |
876 | ||
877 | return 0; | |
878 | } | |
879 | ||
880 | static int release_timeout_callback(sd_event_source *es, uint64_t usec, void *userdata) { | |
881 | Session *s = userdata; | |
882 | ||
883 | assert(es); | |
884 | assert(s); | |
885 | ||
886 | session_stop(s, false); | |
887 | return 0; | |
888 | } | |
889 | ||
890 | int session_release(Session *s) { | |
891 | assert(s); | |
892 | ||
893 | if (!s->started || s->stopping) | |
894 | return 0; | |
895 | ||
896 | if (s->timer_event_source) | |
897 | return 0; | |
898 | ||
899 | return sd_event_add_time_relative( | |
900 | s->manager->event, | |
901 | &s->timer_event_source, | |
902 | CLOCK_MONOTONIC, | |
903 | RELEASE_USEC, 0, | |
904 | release_timeout_callback, s); | |
905 | } | |
906 | ||
907 | bool session_is_active(Session *s) { | |
908 | assert(s); | |
909 | ||
910 | if (!s->seat) | |
911 | return true; | |
912 | ||
913 | return s->seat->active == s; | |
914 | } | |
915 | ||
916 | static int get_tty_atime(const char *tty, usec_t *atime) { | |
917 | _cleanup_free_ char *p = NULL; | |
918 | struct stat st; | |
919 | ||
920 | assert(tty); | |
921 | assert(atime); | |
922 | ||
923 | if (!path_is_absolute(tty)) { | |
924 | p = path_join("/dev", tty); | |
925 | if (!p) | |
926 | return -ENOMEM; | |
927 | ||
928 | tty = p; | |
929 | } else if (!path_startswith(tty, "/dev/")) | |
930 | return -ENOENT; | |
931 | ||
932 | if (lstat(tty, &st) < 0) | |
933 | return -errno; | |
934 | ||
935 | *atime = timespec_load(&st.st_atim); | |
936 | return 0; | |
937 | } | |
938 | ||
939 | static int get_process_ctty_atime(pid_t pid, usec_t *atime) { | |
940 | _cleanup_free_ char *p = NULL; | |
941 | int r; | |
942 | ||
943 | assert(pid > 0); | |
944 | assert(atime); | |
945 | ||
946 | r = get_ctty(pid, NULL, &p); | |
947 | if (r < 0) | |
948 | return r; | |
949 | ||
950 | return get_tty_atime(p, atime); | |
951 | } | |
952 | ||
953 | int session_get_idle_hint(Session *s, dual_timestamp *t) { | |
954 | usec_t atime = 0; | |
955 | int r; | |
956 | ||
957 | assert(s); | |
958 | ||
959 | /* Graphical sessions have an explicit idle hint */ | |
960 | if (SESSION_TYPE_IS_GRAPHICAL(s->type)) { | |
961 | if (t) | |
962 | *t = s->idle_hint_timestamp; | |
963 | ||
964 | return s->idle_hint; | |
965 | } | |
966 | ||
967 | /* For sessions with an explicitly configured tty, let's check its atime */ | |
968 | if (s->tty) { | |
969 | r = get_tty_atime(s->tty, &atime); | |
970 | if (r >= 0) | |
971 | goto found_atime; | |
972 | } | |
973 | ||
974 | /* For sessions with a leader but no explicitly configured tty, let's check the controlling tty of | |
975 | * the leader */ | |
976 | if (pid_is_valid(s->leader)) { | |
977 | r = get_process_ctty_atime(s->leader, &atime); | |
978 | if (r >= 0) | |
979 | goto found_atime; | |
980 | } | |
981 | ||
982 | if (t) | |
983 | *t = DUAL_TIMESTAMP_NULL; | |
984 | ||
985 | return false; | |
986 | ||
987 | found_atime: | |
988 | if (t) | |
989 | dual_timestamp_from_realtime(t, atime); | |
990 | ||
991 | if (s->manager->idle_action_usec <= 0) | |
992 | return false; | |
993 | ||
994 | return usec_add(atime, s->manager->idle_action_usec) <= now(CLOCK_REALTIME); | |
995 | } | |
996 | ||
997 | int session_set_idle_hint(Session *s, bool b) { | |
998 | assert(s); | |
999 | ||
1000 | if (!SESSION_TYPE_IS_GRAPHICAL(s->type)) | |
1001 | return -ENOTTY; | |
1002 | ||
1003 | if (s->idle_hint == b) | |
1004 | return 0; | |
1005 | ||
1006 | s->idle_hint = b; | |
1007 | dual_timestamp_get(&s->idle_hint_timestamp); | |
1008 | ||
1009 | session_send_changed(s, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); | |
1010 | ||
1011 | if (s->seat) | |
1012 | seat_send_changed(s->seat, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); | |
1013 | ||
1014 | user_send_changed(s->user, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); | |
1015 | manager_send_changed(s->manager, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); | |
1016 | ||
1017 | return 1; | |
1018 | } | |
1019 | ||
1020 | int session_get_locked_hint(Session *s) { | |
1021 | assert(s); | |
1022 | ||
1023 | return s->locked_hint; | |
1024 | } | |
1025 | ||
1026 | void session_set_locked_hint(Session *s, bool b) { | |
1027 | assert(s); | |
1028 | ||
1029 | if (s->locked_hint == b) | |
1030 | return; | |
1031 | ||
1032 | s->locked_hint = b; | |
1033 | ||
1034 | session_send_changed(s, "LockedHint", NULL); | |
1035 | } | |
1036 | ||
1037 | void session_set_type(Session *s, SessionType t) { | |
1038 | assert(s); | |
1039 | ||
1040 | if (s->type == t) | |
1041 | return; | |
1042 | ||
1043 | s->type = t; | |
1044 | session_save(s); | |
1045 | ||
1046 | session_send_changed(s, "Type", NULL); | |
1047 | } | |
1048 | ||
1049 | static int session_dispatch_fifo(sd_event_source *es, int fd, uint32_t revents, void *userdata) { | |
1050 | Session *s = userdata; | |
1051 | ||
1052 | assert(s); | |
1053 | assert(s->fifo_fd == fd); | |
1054 | ||
1055 | /* EOF on the FIFO means the session died abnormally. */ | |
1056 | ||
1057 | session_remove_fifo(s); | |
1058 | session_stop(s, false); | |
1059 | ||
1060 | return 1; | |
1061 | } | |
1062 | ||
1063 | int session_create_fifo(Session *s) { | |
1064 | int r; | |
1065 | ||
1066 | assert(s); | |
1067 | ||
1068 | /* Create FIFO */ | |
1069 | if (!s->fifo_path) { | |
1070 | r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0, MKDIR_WARN_MODE); | |
1071 | if (r < 0) | |
1072 | return r; | |
1073 | ||
1074 | s->fifo_path = strjoin("/run/systemd/sessions/", s->id, ".ref"); | |
1075 | if (!s->fifo_path) | |
1076 | return -ENOMEM; | |
1077 | ||
1078 | if (mkfifo(s->fifo_path, 0600) < 0 && errno != EEXIST) | |
1079 | return -errno; | |
1080 | } | |
1081 | ||
1082 | /* Open reading side */ | |
1083 | if (s->fifo_fd < 0) { | |
1084 | s->fifo_fd = open(s->fifo_path, O_RDONLY|O_CLOEXEC|O_NONBLOCK); | |
1085 | if (s->fifo_fd < 0) | |
1086 | return -errno; | |
1087 | } | |
1088 | ||
1089 | if (!s->fifo_event_source) { | |
1090 | r = sd_event_add_io(s->manager->event, &s->fifo_event_source, s->fifo_fd, 0, session_dispatch_fifo, s); | |
1091 | if (r < 0) | |
1092 | return r; | |
1093 | ||
1094 | /* Let's make sure we noticed dead sessions before we process new bus requests (which might create new | |
1095 | * sessions). */ | |
1096 | r = sd_event_source_set_priority(s->fifo_event_source, SD_EVENT_PRIORITY_NORMAL-10); | |
1097 | if (r < 0) | |
1098 | return r; | |
1099 | } | |
1100 | ||
1101 | /* Open writing side */ | |
1102 | r = open(s->fifo_path, O_WRONLY|O_CLOEXEC|O_NONBLOCK); | |
1103 | if (r < 0) | |
1104 | return -errno; | |
1105 | ||
1106 | return r; | |
1107 | } | |
1108 | ||
1109 | static void session_remove_fifo(Session *s) { | |
1110 | assert(s); | |
1111 | ||
1112 | s->fifo_event_source = sd_event_source_unref(s->fifo_event_source); | |
1113 | s->fifo_fd = safe_close(s->fifo_fd); | |
1114 | ||
1115 | if (s->fifo_path) { | |
1116 | (void) unlink(s->fifo_path); | |
1117 | s->fifo_path = mfree(s->fifo_path); | |
1118 | } | |
1119 | } | |
1120 | ||
1121 | bool session_may_gc(Session *s, bool drop_not_started) { | |
1122 | int r; | |
1123 | ||
1124 | assert(s); | |
1125 | ||
1126 | if (drop_not_started && !s->started) | |
1127 | return true; | |
1128 | ||
1129 | if (!s->user) | |
1130 | return true; | |
1131 | ||
1132 | if (s->fifo_fd >= 0) { | |
1133 | if (pipe_eof(s->fifo_fd) <= 0) | |
1134 | return false; | |
1135 | } | |
1136 | ||
1137 | if (s->scope_job) { | |
1138 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; | |
1139 | ||
1140 | r = manager_job_is_active(s->manager, s->scope_job, &error); | |
1141 | if (r < 0) | |
1142 | log_debug_errno(r, "Failed to determine whether job '%s' is pending, ignoring: %s", s->scope_job, bus_error_message(&error, r)); | |
1143 | if (r != 0) | |
1144 | return false; | |
1145 | } | |
1146 | ||
1147 | if (s->scope) { | |
1148 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; | |
1149 | ||
1150 | r = manager_unit_is_active(s->manager, s->scope, &error); | |
1151 | if (r < 0) | |
1152 | log_debug_errno(r, "Failed to determine whether unit '%s' is active, ignoring: %s", s->scope, bus_error_message(&error, r)); | |
1153 | if (r != 0) | |
1154 | return false; | |
1155 | } | |
1156 | ||
1157 | return true; | |
1158 | } | |
1159 | ||
1160 | void session_add_to_gc_queue(Session *s) { | |
1161 | assert(s); | |
1162 | ||
1163 | if (s->in_gc_queue) | |
1164 | return; | |
1165 | ||
1166 | LIST_PREPEND(gc_queue, s->manager->session_gc_queue, s); | |
1167 | s->in_gc_queue = true; | |
1168 | } | |
1169 | ||
1170 | SessionState session_get_state(Session *s) { | |
1171 | assert(s); | |
1172 | ||
1173 | /* always check closing first */ | |
1174 | if (s->stopping || s->timer_event_source) | |
1175 | return SESSION_CLOSING; | |
1176 | ||
1177 | if (s->scope_job || s->fifo_fd < 0) | |
1178 | return SESSION_OPENING; | |
1179 | ||
1180 | if (session_is_active(s)) | |
1181 | return SESSION_ACTIVE; | |
1182 | ||
1183 | return SESSION_ONLINE; | |
1184 | } | |
1185 | ||
1186 | int session_kill(Session *s, KillWho who, int signo) { | |
1187 | assert(s); | |
1188 | ||
1189 | if (!s->scope) | |
1190 | return -ESRCH; | |
1191 | ||
1192 | return manager_kill_unit(s->manager, s->scope, who, signo, NULL); | |
1193 | } | |
1194 | ||
1195 | static int session_open_vt(Session *s) { | |
1196 | char path[sizeof("/dev/tty") + DECIMAL_STR_MAX(s->vtnr)]; | |
1197 | ||
1198 | if (s->vtnr < 1) | |
1199 | return -ENODEV; | |
1200 | ||
1201 | if (s->vtfd >= 0) | |
1202 | return s->vtfd; | |
1203 | ||
1204 | sprintf(path, "/dev/tty%u", s->vtnr); | |
1205 | s->vtfd = open_terminal(path, O_RDWR | O_CLOEXEC | O_NONBLOCK | O_NOCTTY); | |
1206 | if (s->vtfd < 0) | |
1207 | return log_error_errno(s->vtfd, "cannot open VT %s of session %s: %m", path, s->id); | |
1208 | ||
1209 | return s->vtfd; | |
1210 | } | |
1211 | ||
1212 | static int session_prepare_vt(Session *s) { | |
1213 | int vt, r; | |
1214 | struct vt_mode mode = {}; | |
1215 | ||
1216 | if (s->vtnr < 1) | |
1217 | return 0; | |
1218 | ||
1219 | vt = session_open_vt(s); | |
1220 | if (vt < 0) | |
1221 | return vt; | |
1222 | ||
1223 | r = fchown(vt, s->user->user_record->uid, -1); | |
1224 | if (r < 0) { | |
1225 | r = log_error_errno(errno, | |
1226 | "Cannot change owner of /dev/tty%u: %m", | |
1227 | s->vtnr); | |
1228 | goto error; | |
1229 | } | |
1230 | ||
1231 | r = ioctl(vt, KDSKBMODE, K_OFF); | |
1232 | if (r < 0) { | |
1233 | r = log_error_errno(errno, | |
1234 | "Cannot set K_OFF on /dev/tty%u: %m", | |
1235 | s->vtnr); | |
1236 | goto error; | |
1237 | } | |
1238 | ||
1239 | r = ioctl(vt, KDSETMODE, KD_GRAPHICS); | |
1240 | if (r < 0) { | |
1241 | r = log_error_errno(errno, | |
1242 | "Cannot set KD_GRAPHICS on /dev/tty%u: %m", | |
1243 | s->vtnr); | |
1244 | goto error; | |
1245 | } | |
1246 | ||
1247 | /* Oh, thanks to the VT layer, VT_AUTO does not work with KD_GRAPHICS. | |
1248 | * So we need a dummy handler here which just acknowledges *all* VT | |
1249 | * switch requests. */ | |
1250 | mode.mode = VT_PROCESS; | |
1251 | mode.relsig = SIGRTMIN; | |
1252 | mode.acqsig = SIGRTMIN + 1; | |
1253 | r = ioctl(vt, VT_SETMODE, &mode); | |
1254 | if (r < 0) { | |
1255 | r = log_error_errno(errno, | |
1256 | "Cannot set VT_PROCESS on /dev/tty%u: %m", | |
1257 | s->vtnr); | |
1258 | goto error; | |
1259 | } | |
1260 | ||
1261 | return 0; | |
1262 | ||
1263 | error: | |
1264 | session_restore_vt(s); | |
1265 | return r; | |
1266 | } | |
1267 | ||
1268 | static void session_restore_vt(Session *s) { | |
1269 | int r; | |
1270 | ||
1271 | r = vt_restore(s->vtfd); | |
1272 | if (r == -EIO) { | |
1273 | int vt, old_fd; | |
1274 | ||
1275 | /* It might happen if the controlling process exited before or while we were | |
1276 | * restoring the VT as it would leave the old file-descriptor in a hung-up | |
1277 | * state. In this case let's retry with a fresh handle to the virtual terminal. */ | |
1278 | ||
1279 | /* We do a little dance to avoid having the terminal be available | |
1280 | * for reuse before we've cleaned it up. */ | |
1281 | old_fd = TAKE_FD(s->vtfd); | |
1282 | ||
1283 | vt = session_open_vt(s); | |
1284 | safe_close(old_fd); | |
1285 | ||
1286 | if (vt >= 0) | |
1287 | r = vt_restore(vt); | |
1288 | } | |
1289 | ||
1290 | if (r < 0) | |
1291 | log_warning_errno(r, "Failed to restore VT, ignoring: %m"); | |
1292 | ||
1293 | s->vtfd = safe_close(s->vtfd); | |
1294 | } | |
1295 | ||
1296 | void session_leave_vt(Session *s) { | |
1297 | int r; | |
1298 | ||
1299 | assert(s); | |
1300 | ||
1301 | /* This is called whenever we get a VT-switch signal from the kernel. | |
1302 | * We acknowledge all of them unconditionally. Note that session are | |
1303 | * free to overwrite those handlers and we only register them for | |
1304 | * sessions with controllers. Legacy sessions are not affected. | |
1305 | * However, if we switch from a non-legacy to a legacy session, we must | |
1306 | * make sure to pause all device before acknowledging the switch. We | |
1307 | * process the real switch only after we are notified via sysfs, so the | |
1308 | * legacy session might have already started using the devices. If we | |
1309 | * don't pause the devices before the switch, we might confuse the | |
1310 | * session we switch to. */ | |
1311 | ||
1312 | if (s->vtfd < 0) | |
1313 | return; | |
1314 | ||
1315 | session_device_pause_all(s); | |
1316 | r = vt_release(s->vtfd, false); | |
1317 | if (r < 0) | |
1318 | log_debug_errno(r, "Cannot release VT of session %s: %m", s->id); | |
1319 | } | |
1320 | ||
1321 | bool session_is_controller(Session *s, const char *sender) { | |
1322 | assert(s); | |
1323 | ||
1324 | return streq_ptr(s->controller, sender); | |
1325 | } | |
1326 | ||
1327 | static void session_release_controller(Session *s, bool notify) { | |
1328 | _cleanup_free_ char *name = NULL; | |
1329 | SessionDevice *sd; | |
1330 | ||
1331 | if (!s->controller) | |
1332 | return; | |
1333 | ||
1334 | name = s->controller; | |
1335 | ||
1336 | /* By resetting the controller before releasing the devices, we won't | |
1337 | * send notification signals. This avoids sending useless notifications | |
1338 | * if the controller is released on disconnects. */ | |
1339 | if (!notify) | |
1340 | s->controller = NULL; | |
1341 | ||
1342 | while ((sd = hashmap_first(s->devices))) | |
1343 | session_device_free(sd); | |
1344 | ||
1345 | s->controller = NULL; | |
1346 | s->track = sd_bus_track_unref(s->track); | |
1347 | } | |
1348 | ||
1349 | static int on_bus_track(sd_bus_track *track, void *userdata) { | |
1350 | Session *s = userdata; | |
1351 | ||
1352 | assert(track); | |
1353 | assert(s); | |
1354 | ||
1355 | session_drop_controller(s); | |
1356 | ||
1357 | return 0; | |
1358 | } | |
1359 | ||
1360 | int session_set_controller(Session *s, const char *sender, bool force, bool prepare) { | |
1361 | _cleanup_free_ char *name = NULL; | |
1362 | int r; | |
1363 | ||
1364 | assert(s); | |
1365 | assert(sender); | |
1366 | ||
1367 | if (session_is_controller(s, sender)) | |
1368 | return 0; | |
1369 | if (s->controller && !force) | |
1370 | return -EBUSY; | |
1371 | ||
1372 | name = strdup(sender); | |
1373 | if (!name) | |
1374 | return -ENOMEM; | |
1375 | ||
1376 | s->track = sd_bus_track_unref(s->track); | |
1377 | r = sd_bus_track_new(s->manager->bus, &s->track, on_bus_track, s); | |
1378 | if (r < 0) | |
1379 | return r; | |
1380 | ||
1381 | r = sd_bus_track_add_name(s->track, name); | |
1382 | if (r < 0) | |
1383 | return r; | |
1384 | ||
1385 | /* When setting a session controller, we forcibly mute the VT and set | |
1386 | * it into graphics-mode. Applications can override that by changing | |
1387 | * VT state after calling TakeControl(). However, this serves as a good | |
1388 | * default and well-behaving controllers can now ignore VTs entirely. | |
1389 | * Note that we reset the VT on ReleaseControl() and if the controller | |
1390 | * exits. | |
1391 | * If logind crashes/restarts, we restore the controller during restart | |
1392 | * (without preparing the VT since the controller has probably overridden | |
1393 | * VT state by now) or reset the VT in case it crashed/exited, too. */ | |
1394 | if (prepare) { | |
1395 | r = session_prepare_vt(s); | |
1396 | if (r < 0) { | |
1397 | s->track = sd_bus_track_unref(s->track); | |
1398 | return r; | |
1399 | } | |
1400 | } | |
1401 | ||
1402 | session_release_controller(s, true); | |
1403 | s->controller = TAKE_PTR(name); | |
1404 | session_save(s); | |
1405 | ||
1406 | return 0; | |
1407 | } | |
1408 | ||
1409 | void session_drop_controller(Session *s) { | |
1410 | assert(s); | |
1411 | ||
1412 | if (!s->controller) | |
1413 | return; | |
1414 | ||
1415 | s->track = sd_bus_track_unref(s->track); | |
1416 | session_set_type(s, s->original_type); | |
1417 | session_release_controller(s, false); | |
1418 | session_save(s); | |
1419 | session_restore_vt(s); | |
1420 | } | |
1421 | ||
1422 | static const char* const session_state_table[_SESSION_STATE_MAX] = { | |
1423 | [SESSION_OPENING] = "opening", | |
1424 | [SESSION_ONLINE] = "online", | |
1425 | [SESSION_ACTIVE] = "active", | |
1426 | [SESSION_CLOSING] = "closing" | |
1427 | }; | |
1428 | ||
1429 | DEFINE_STRING_TABLE_LOOKUP(session_state, SessionState); | |
1430 | ||
1431 | static const char* const session_type_table[_SESSION_TYPE_MAX] = { | |
1432 | [SESSION_UNSPECIFIED] = "unspecified", | |
1433 | [SESSION_TTY] = "tty", | |
1434 | [SESSION_X11] = "x11", | |
1435 | [SESSION_WAYLAND] = "wayland", | |
1436 | [SESSION_MIR] = "mir", | |
1437 | [SESSION_WEB] = "web", | |
1438 | }; | |
1439 | ||
1440 | DEFINE_STRING_TABLE_LOOKUP(session_type, SessionType); | |
1441 | ||
1442 | static const char* const session_class_table[_SESSION_CLASS_MAX] = { | |
1443 | [SESSION_USER] = "user", | |
1444 | [SESSION_GREETER] = "greeter", | |
1445 | [SESSION_LOCK_SCREEN] = "lock-screen", | |
1446 | [SESSION_BACKGROUND] = "background" | |
1447 | }; | |
1448 | ||
1449 | DEFINE_STRING_TABLE_LOOKUP(session_class, SessionClass); | |
1450 | ||
1451 | static const char* const kill_who_table[_KILL_WHO_MAX] = { | |
1452 | [KILL_LEADER] = "leader", | |
1453 | [KILL_ALL] = "all" | |
1454 | }; | |
1455 | ||
1456 | DEFINE_STRING_TABLE_LOOKUP(kill_who, KillWho); | |
1457 | ||
1458 | static const char* const tty_validity_table[_TTY_VALIDITY_MAX] = { | |
1459 | [TTY_FROM_PAM] = "from-pam", | |
1460 | [TTY_FROM_UTMP] = "from-utmp", | |
1461 | [TTY_UTMP_INCONSISTENT] = "utmp-inconsistent", | |
1462 | }; | |
1463 | ||
1464 | DEFINE_STRING_TABLE_LOOKUP(tty_validity, TTYValidity); |