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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
20263082 LP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2011 Lennart Poettering | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
8 | under the terms of the GNU Lesser General Public License as published by |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
20263082 LP |
10 | (at your option) any later version. |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 15 | Lesser General Public License for more details. |
20263082 | 16 | |
5430f7f2 | 17 | You should have received a copy of the GNU Lesser General Public License |
20263082 LP |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
19 | ***/ | |
20 | ||
21 | #include <errno.h> | |
90a18413 | 22 | #include <fcntl.h> |
90a18413 | 23 | #include <linux/kd.h> |
4f5dd394 | 24 | #include <linux/vt.h> |
90a18413 | 25 | #include <signal.h> |
20263082 | 26 | #include <string.h> |
90a18413 | 27 | #include <sys/ioctl.h> |
20263082 LP |
28 | #include <unistd.h> |
29 | ||
cc377381 | 30 | #include "sd-messages.h" |
4f5dd394 | 31 | |
b5efdb8a | 32 | #include "alloc-util.h" |
430f0182 | 33 | #include "audit-util.h" |
cc377381 | 34 | #include "bus-error.h" |
4f5dd394 LP |
35 | #include "bus-util.h" |
36 | #include "escape.h" | |
3ffd4af2 | 37 | #include "fd-util.h" |
4f5dd394 | 38 | #include "fileio.h" |
f97b34a6 | 39 | #include "format-util.h" |
c004493c | 40 | #include "io-util.h" |
3ffd4af2 | 41 | #include "logind-session.h" |
4f5dd394 | 42 | #include "mkdir.h" |
6bedfcbb | 43 | #include "parse-util.h" |
4f5dd394 | 44 | #include "path-util.h" |
8b43440b | 45 | #include "string-table.h" |
288a74cc | 46 | #include "terminal-util.h" |
b1d4f8e1 | 47 | #include "user-util.h" |
4f5dd394 | 48 | #include "util.h" |
54191eb3 | 49 | #include "process-util.h" |
20263082 | 50 | |
5f41d1f1 LP |
51 | #define RELEASE_USEC (20*USEC_PER_SEC) |
52 | ||
53 | static void session_remove_fifo(Session *s); | |
54 | ||
9444b1f2 | 55 | Session* session_new(Manager *m, const char *id) { |
20263082 LP |
56 | Session *s; |
57 | ||
58 | assert(m); | |
59 | assert(id); | |
4b549144 | 60 | assert(session_id_valid(id)); |
20263082 | 61 | |
14c3baca | 62 | s = new0(Session, 1); |
20263082 LP |
63 | if (!s) |
64 | return NULL; | |
65 | ||
98a28fef | 66 | s->state_file = strappend("/run/systemd/sessions/", id); |
6b430fdb ZJS |
67 | if (!s->state_file) |
68 | return mfree(s); | |
20263082 | 69 | |
d5099efc | 70 | s->devices = hashmap_new(&devt_hash_ops); |
118ecf32 DH |
71 | if (!s->devices) { |
72 | free(s->state_file); | |
6b430fdb | 73 | return mfree(s); |
118ecf32 DH |
74 | } |
75 | ||
2b6bf07d | 76 | s->id = basename(s->state_file); |
20263082 LP |
77 | |
78 | if (hashmap_put(m->sessions, s->id, s) < 0) { | |
118ecf32 | 79 | hashmap_free(s->devices); |
f8e2fb7b | 80 | free(s->state_file); |
6b430fdb | 81 | return mfree(s); |
20263082 LP |
82 | } |
83 | ||
84 | s->manager = m; | |
932e3ee7 | 85 | s->fifo_fd = -1; |
90a18413 | 86 | s->vtfd = -1; |
3a87a86e | 87 | s->audit_id = AUDIT_SESSION_INVALID; |
20263082 LP |
88 | |
89 | return s; | |
90 | } | |
91 | ||
92 | void session_free(Session *s) { | |
118ecf32 DH |
93 | SessionDevice *sd; |
94 | ||
20263082 LP |
95 | assert(s); |
96 | ||
14c3baca | 97 | if (s->in_gc_queue) |
71fda00f | 98 | LIST_REMOVE(gc_queue, s->manager->session_gc_queue, s); |
14c3baca | 99 | |
5f41d1f1 LP |
100 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
101 | ||
cc377381 LP |
102 | session_remove_fifo(s); |
103 | ||
ae5e06bd DH |
104 | session_drop_controller(s); |
105 | ||
118ecf32 DH |
106 | while ((sd = hashmap_first(s->devices))) |
107 | session_device_free(sd); | |
108 | ||
109 | hashmap_free(s->devices); | |
110 | ||
20263082 | 111 | if (s->user) { |
71fda00f | 112 | LIST_REMOVE(sessions_by_user, s->user->sessions, s); |
20263082 LP |
113 | |
114 | if (s->user->display == s) | |
115 | s->user->display = NULL; | |
116 | } | |
117 | ||
9418f147 LP |
118 | if (s->seat) { |
119 | if (s->seat->active == s) | |
120 | s->seat->active = NULL; | |
d7bd01b5 DH |
121 | if (s->seat->pending_switch == s) |
122 | s->seat->pending_switch = NULL; | |
9418f147 | 123 | |
49e6fdbf | 124 | seat_evict_position(s->seat, s); |
71fda00f | 125 | LIST_REMOVE(sessions_by_seat, s->seat->sessions, s); |
9418f147 | 126 | } |
20263082 | 127 | |
fb6becb4 LP |
128 | if (s->scope) { |
129 | hashmap_remove(s->manager->session_units, s->scope); | |
130 | free(s->scope); | |
131 | } | |
132 | ||
133 | free(s->scope_job); | |
1713813d | 134 | |
cc377381 | 135 | sd_bus_message_unref(s->create_message); |
20263082 LP |
136 | |
137 | free(s->tty); | |
138 | free(s->display); | |
139 | free(s->remote_host); | |
3f49d45a | 140 | free(s->remote_user); |
98a28fef | 141 | free(s->service); |
a4cd87e9 | 142 | free(s->desktop); |
20263082 LP |
143 | |
144 | hashmap_remove(s->manager->sessions, s->id); | |
98a28fef | 145 | |
d2f92cdf | 146 | free(s->state_file); |
20263082 LP |
147 | free(s); |
148 | } | |
149 | ||
9444b1f2 LP |
150 | void session_set_user(Session *s, User *u) { |
151 | assert(s); | |
152 | assert(!s->user); | |
153 | ||
154 | s->user = u; | |
71fda00f | 155 | LIST_PREPEND(sessions_by_user, u->sessions, s); |
9444b1f2 LP |
156 | } |
157 | ||
aed24c4c FB |
158 | static void session_save_devices(Session *s, FILE *f) { |
159 | SessionDevice *sd; | |
160 | Iterator i; | |
161 | ||
162 | if (!hashmap_isempty(s->devices)) { | |
163 | fprintf(f, "DEVICES="); | |
164 | HASHMAP_FOREACH(sd, s->devices, i) | |
165 | fprintf(f, "%u:%u ", major(sd->dev), minor(sd->dev)); | |
166 | fprintf(f, "\n"); | |
167 | } | |
168 | } | |
169 | ||
20263082 | 170 | int session_save(Session *s) { |
507f22bd | 171 | _cleanup_free_ char *temp_path = NULL; |
cc377381 | 172 | _cleanup_fclose_ FILE *f = NULL; |
20263082 LP |
173 | int r = 0; |
174 | ||
175 | assert(s); | |
176 | ||
9444b1f2 LP |
177 | if (!s->user) |
178 | return -ESTALE; | |
179 | ||
accaeded LP |
180 | if (!s->started) |
181 | return 0; | |
182 | ||
c31ad024 | 183 | r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0, false); |
20263082 | 184 | if (r < 0) |
dacd6cee | 185 | goto fail; |
20263082 | 186 | |
14c3baca LP |
187 | r = fopen_temporary(s->state_file, &f, &temp_path); |
188 | if (r < 0) | |
dacd6cee | 189 | goto fail; |
20263082 LP |
190 | |
191 | assert(s->user); | |
192 | ||
14c3baca LP |
193 | fchmod(fileno(f), 0644); |
194 | ||
20263082 LP |
195 | fprintf(f, |
196 | "# This is private data. Do not parse.\n" | |
90b2de37 | 197 | "UID="UID_FMT"\n" |
20263082 LP |
198 | "USER=%s\n" |
199 | "ACTIVE=%i\n" | |
0604381b | 200 | "STATE=%s\n" |
fb6becb4 | 201 | "REMOTE=%i\n", |
90b2de37 | 202 | s->user->uid, |
20263082 LP |
203 | s->user->name, |
204 | session_is_active(s), | |
0604381b | 205 | session_state_to_string(session_get_state(s)), |
fb6becb4 | 206 | s->remote); |
20263082 | 207 | |
a91e4e53 | 208 | if (s->type >= 0) |
507f22bd | 209 | fprintf(f, "TYPE=%s\n", session_type_to_string(s->type)); |
a91e4e53 | 210 | |
55efac6c | 211 | if (s->class >= 0) |
507f22bd | 212 | fprintf(f, "CLASS=%s\n", session_class_to_string(s->class)); |
55efac6c | 213 | |
fb6becb4 LP |
214 | if (s->scope) |
215 | fprintf(f, "SCOPE=%s\n", s->scope); | |
fb6becb4 LP |
216 | if (s->scope_job) |
217 | fprintf(f, "SCOPE_JOB=%s\n", s->scope_job); | |
20263082 | 218 | |
932e3ee7 | 219 | if (s->fifo_path) |
507f22bd | 220 | fprintf(f, "FIFO=%s\n", s->fifo_path); |
932e3ee7 | 221 | |
20263082 | 222 | if (s->seat) |
507f22bd | 223 | fprintf(f, "SEAT=%s\n", s->seat->id); |
20263082 LP |
224 | |
225 | if (s->tty) | |
507f22bd | 226 | fprintf(f, "TTY=%s\n", s->tty); |
20263082 LP |
227 | |
228 | if (s->display) | |
507f22bd | 229 | fprintf(f, "DISPLAY=%s\n", s->display); |
20263082 | 230 | |
558c6490 LP |
231 | if (s->remote_host) { |
232 | _cleanup_free_ char *escaped; | |
233 | ||
234 | escaped = cescape(s->remote_host); | |
235 | if (!escaped) { | |
236 | r = -ENOMEM; | |
dacd6cee | 237 | goto fail; |
558c6490 LP |
238 | } |
239 | ||
240 | fprintf(f, "REMOTE_HOST=%s\n", escaped); | |
241 | } | |
242 | ||
243 | if (s->remote_user) { | |
244 | _cleanup_free_ char *escaped; | |
245 | ||
246 | escaped = cescape(s->remote_user); | |
247 | if (!escaped) { | |
248 | r = -ENOMEM; | |
dacd6cee | 249 | goto fail; |
558c6490 LP |
250 | } |
251 | ||
252 | fprintf(f, "REMOTE_USER=%s\n", escaped); | |
253 | } | |
254 | ||
255 | if (s->service) { | |
256 | _cleanup_free_ char *escaped; | |
20263082 | 257 | |
558c6490 LP |
258 | escaped = cescape(s->service); |
259 | if (!escaped) { | |
260 | r = -ENOMEM; | |
dacd6cee | 261 | goto fail; |
558c6490 LP |
262 | } |
263 | ||
264 | fprintf(f, "SERVICE=%s\n", escaped); | |
265 | } | |
3f49d45a | 266 | |
558c6490 LP |
267 | if (s->desktop) { |
268 | _cleanup_free_ char *escaped; | |
98a28fef | 269 | |
558c6490 LP |
270 | |
271 | escaped = cescape(s->desktop); | |
272 | if (!escaped) { | |
273 | r = -ENOMEM; | |
dacd6cee | 274 | goto fail; |
558c6490 LP |
275 | } |
276 | ||
277 | fprintf(f, "DESKTOP=%s\n", escaped); | |
278 | } | |
a4cd87e9 | 279 | |
bf7825ae | 280 | if (s->seat && seat_has_vts(s->seat)) |
92bd5ff3 | 281 | fprintf(f, "VTNR=%u\n", s->vtnr); |
20263082 | 282 | |
49e6fdbf | 283 | if (!s->vtnr) |
e6494a07 | 284 | fprintf(f, "POSITION=%u\n", s->position); |
49e6fdbf | 285 | |
54191eb3 | 286 | if (pid_is_valid(s->leader)) |
90b2de37 | 287 | fprintf(f, "LEADER="PID_FMT"\n", s->leader); |
20263082 | 288 | |
3a87a86e | 289 | if (audit_session_is_valid(s->audit_id)) |
507f22bd | 290 | fprintf(f, "AUDIT=%"PRIu32"\n", s->audit_id); |
20263082 | 291 | |
9444b1f2 LP |
292 | if (dual_timestamp_is_set(&s->timestamp)) |
293 | fprintf(f, | |
90b2de37 ZJS |
294 | "REALTIME="USEC_FMT"\n" |
295 | "MONOTONIC="USEC_FMT"\n", | |
296 | s->timestamp.realtime, | |
297 | s->timestamp.monotonic); | |
9444b1f2 | 298 | |
aed24c4c | 299 | if (s->controller) { |
6d33772f | 300 | fprintf(f, "CONTROLLER=%s\n", s->controller); |
aed24c4c FB |
301 | session_save_devices(s, f); |
302 | } | |
6d33772f | 303 | |
dacd6cee LP |
304 | r = fflush_and_check(f); |
305 | if (r < 0) | |
306 | goto fail; | |
14c3baca | 307 | |
dacd6cee | 308 | if (rename(temp_path, s->state_file) < 0) { |
20263082 | 309 | r = -errno; |
dacd6cee | 310 | goto fail; |
20263082 LP |
311 | } |
312 | ||
dacd6cee LP |
313 | return 0; |
314 | ||
315 | fail: | |
316 | (void) unlink(s->state_file); | |
14c3baca | 317 | |
dacd6cee LP |
318 | if (temp_path) |
319 | (void) unlink(temp_path); | |
320 | ||
321 | return log_error_errno(r, "Failed to save session data %s: %m", s->state_file); | |
20263082 LP |
322 | } |
323 | ||
aed24c4c FB |
324 | static int session_load_devices(Session *s, const char *devices) { |
325 | const char *p; | |
326 | int r = 0; | |
327 | ||
328 | assert(s); | |
329 | ||
330 | for (p = devices;;) { | |
331 | _cleanup_free_ char *word = NULL; | |
332 | SessionDevice *sd; | |
333 | dev_t dev; | |
334 | int k; | |
335 | ||
336 | k = extract_first_word(&p, &word, NULL, 0); | |
337 | if (k == 0) | |
338 | break; | |
339 | if (k < 0) { | |
340 | r = k; | |
341 | break; | |
342 | } | |
343 | ||
344 | k = parse_dev(word, &dev); | |
345 | if (k < 0) { | |
346 | r = k; | |
347 | continue; | |
348 | } | |
349 | ||
350 | /* The file descriptors for loaded devices will be reattached later. */ | |
351 | k = session_device_new(s, dev, false, &sd); | |
352 | if (k < 0) | |
353 | r = k; | |
354 | } | |
355 | ||
356 | if (r < 0) | |
357 | log_error_errno(r, "Loading session devices for session %s failed: %m", s->id); | |
358 | ||
359 | return r; | |
360 | } | |
dacd6cee | 361 | |
20263082 | 362 | int session_load(Session *s) { |
9444b1f2 | 363 | _cleanup_free_ char *remote = NULL, |
a185c5aa LP |
364 | *seat = NULL, |
365 | *vtnr = NULL, | |
be94d954 | 366 | *state = NULL, |
e6494a07 | 367 | *position = NULL, |
a185c5aa | 368 | *leader = NULL, |
55efac6c | 369 | *type = NULL, |
9444b1f2 LP |
370 | *class = NULL, |
371 | *uid = NULL, | |
372 | *realtime = NULL, | |
6d33772f | 373 | *monotonic = NULL, |
aed24c4c FB |
374 | *controller = NULL, |
375 | *active = NULL, | |
376 | *devices = NULL; | |
a185c5aa LP |
377 | |
378 | int k, r; | |
379 | ||
20263082 LP |
380 | assert(s); |
381 | ||
a185c5aa LP |
382 | r = parse_env_file(s->state_file, NEWLINE, |
383 | "REMOTE", &remote, | |
fb6becb4 LP |
384 | "SCOPE", &s->scope, |
385 | "SCOPE_JOB", &s->scope_job, | |
932e3ee7 | 386 | "FIFO", &s->fifo_path, |
a185c5aa LP |
387 | "SEAT", &seat, |
388 | "TTY", &s->tty, | |
389 | "DISPLAY", &s->display, | |
390 | "REMOTE_HOST", &s->remote_host, | |
391 | "REMOTE_USER", &s->remote_user, | |
98a28fef | 392 | "SERVICE", &s->service, |
a4cd87e9 | 393 | "DESKTOP", &s->desktop, |
a185c5aa | 394 | "VTNR", &vtnr, |
be94d954 | 395 | "STATE", &state, |
e6494a07 | 396 | "POSITION", &position, |
a185c5aa | 397 | "LEADER", &leader, |
a91e4e53 | 398 | "TYPE", &type, |
55efac6c | 399 | "CLASS", &class, |
9444b1f2 LP |
400 | "UID", &uid, |
401 | "REALTIME", &realtime, | |
402 | "MONOTONIC", &monotonic, | |
6d33772f | 403 | "CONTROLLER", &controller, |
aed24c4c FB |
404 | "ACTIVE", &active, |
405 | "DEVICES", &devices, | |
a185c5aa LP |
406 | NULL); |
407 | ||
f647962d MS |
408 | if (r < 0) |
409 | return log_error_errno(r, "Failed to read %s: %m", s->state_file); | |
9444b1f2 LP |
410 | |
411 | if (!s->user) { | |
412 | uid_t u; | |
413 | User *user; | |
414 | ||
415 | if (!uid) { | |
416 | log_error("UID not specified for session %s", s->id); | |
417 | return -ENOENT; | |
418 | } | |
419 | ||
420 | r = parse_uid(uid, &u); | |
421 | if (r < 0) { | |
422 | log_error("Failed to parse UID value %s for session %s.", uid, s->id); | |
423 | return r; | |
424 | } | |
425 | ||
8cb4ab00 | 426 | user = hashmap_get(s->manager->users, UID_TO_PTR(u)); |
9444b1f2 LP |
427 | if (!user) { |
428 | log_error("User of session %s not known.", s->id); | |
429 | return -ENOENT; | |
430 | } | |
431 | ||
432 | session_set_user(s, user); | |
433 | } | |
a185c5aa LP |
434 | |
435 | if (remote) { | |
436 | k = parse_boolean(remote); | |
437 | if (k >= 0) | |
438 | s->remote = k; | |
439 | } | |
440 | ||
c506027a DH |
441 | if (vtnr) |
442 | safe_atou(vtnr, &s->vtnr); | |
443 | ||
9418f147 | 444 | if (seat && !s->seat) { |
a185c5aa LP |
445 | Seat *o; |
446 | ||
447 | o = hashmap_get(s->manager->seats, seat); | |
448 | if (o) | |
c506027a DH |
449 | r = seat_attach_session(o, s); |
450 | if (!o || r < 0) | |
451 | log_error("Cannot attach session %s to seat %s", s->id, seat); | |
a185c5aa LP |
452 | } |
453 | ||
c506027a DH |
454 | if (!s->seat || !seat_has_vts(s->seat)) |
455 | s->vtnr = 0; | |
a185c5aa | 456 | |
e6494a07 | 457 | if (position && s->seat) { |
49e6fdbf DH |
458 | unsigned int npos; |
459 | ||
e6494a07 | 460 | safe_atou(position, &npos); |
49e6fdbf DH |
461 | seat_claim_position(s->seat, s, npos); |
462 | } | |
463 | ||
a185c5aa | 464 | if (leader) { |
3a87a86e LP |
465 | if (parse_pid(leader, &s->leader) >= 0) |
466 | (void) audit_session_from_pid(s->leader, &s->audit_id); | |
a185c5aa LP |
467 | } |
468 | ||
a91e4e53 LP |
469 | if (type) { |
470 | SessionType t; | |
471 | ||
472 | t = session_type_from_string(type); | |
473 | if (t >= 0) | |
474 | s->type = t; | |
475 | } | |
476 | ||
55efac6c LP |
477 | if (class) { |
478 | SessionClass c; | |
479 | ||
480 | c = session_class_from_string(class); | |
481 | if (c >= 0) | |
482 | s->class = c; | |
483 | } | |
484 | ||
be94d954 MP |
485 | if (state && streq(state, "closing")) |
486 | s->stopping = true; | |
487 | ||
b4f78aea LP |
488 | if (s->fifo_path) { |
489 | int fd; | |
490 | ||
491 | /* If we open an unopened pipe for reading we will not | |
492 | get an EOF. to trigger an EOF we hence open it for | |
be94d954 MP |
493 | writing, but close it right away which then will |
494 | trigger the EOF. This will happen immediately if no | |
495 | other process has the FIFO open for writing, i. e. | |
496 | when the session died before logind (re)started. */ | |
b4f78aea LP |
497 | |
498 | fd = session_create_fifo(s); | |
03e334a1 | 499 | safe_close(fd); |
b4f78aea LP |
500 | } |
501 | ||
b895a735 BR |
502 | if (realtime) |
503 | timestamp_deserialize(realtime, &s->timestamp.realtime); | |
504 | if (monotonic) | |
505 | timestamp_deserialize(monotonic, &s->timestamp.monotonic); | |
a185c5aa | 506 | |
aed24c4c FB |
507 | if (active) { |
508 | k = parse_boolean(active); | |
509 | if (k >= 0) | |
510 | s->was_active = k; | |
511 | } | |
512 | ||
6d33772f | 513 | if (controller) { |
aed24c4c | 514 | if (bus_name_has_owner(s->manager->bus, controller, NULL) > 0) { |
dc6284e9 | 515 | session_set_controller(s, controller, false, false); |
aed24c4c FB |
516 | session_load_devices(s, devices); |
517 | } else | |
90a18413 | 518 | session_restore_vt(s); |
6d33772f DH |
519 | } |
520 | ||
a185c5aa | 521 | return r; |
20263082 LP |
522 | } |
523 | ||
524 | int session_activate(Session *s) { | |
d7bd01b5 DH |
525 | unsigned int num_pending; |
526 | ||
20263082 | 527 | assert(s); |
9444b1f2 | 528 | assert(s->user); |
20263082 | 529 | |
20263082 | 530 | if (!s->seat) |
15411c0c | 531 | return -EOPNOTSUPP; |
20263082 LP |
532 | |
533 | if (s->seat->active == s) | |
534 | return 0; | |
535 | ||
d7bd01b5 DH |
536 | /* on seats with VTs, we let VTs manage session-switching */ |
537 | if (seat_has_vts(s->seat)) { | |
92bd5ff3 | 538 | if (!s->vtnr) |
15411c0c | 539 | return -EOPNOTSUPP; |
d7bd01b5 DH |
540 | |
541 | return chvt(s->vtnr); | |
542 | } | |
543 | ||
544 | /* On seats without VTs, we implement session-switching in logind. We | |
545 | * try to pause all session-devices and wait until the session | |
546 | * controller acknowledged them. Once all devices are asleep, we simply | |
547 | * switch the active session and be done. | |
548 | * We save the session we want to switch to in seat->pending_switch and | |
549 | * seat_complete_switch() will perform the final switch. */ | |
550 | ||
551 | s->seat->pending_switch = s; | |
552 | ||
553 | /* if no devices are running, immediately perform the session switch */ | |
554 | num_pending = session_device_try_pause_all(s); | |
555 | if (!num_pending) | |
556 | seat_complete_switch(s->seat); | |
20263082 | 557 | |
d7bd01b5 | 558 | return 0; |
20263082 LP |
559 | } |
560 | ||
fb6becb4 | 561 | static int session_start_scope(Session *s) { |
98a28fef LP |
562 | int r; |
563 | ||
564 | assert(s); | |
9444b1f2 | 565 | assert(s->user); |
98a28fef | 566 | |
fb6becb4 | 567 | if (!s->scope) { |
4afd3348 | 568 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; |
39883f62 | 569 | char *scope, *job = NULL; |
90558f31 | 570 | const char *description; |
405e0255 | 571 | |
605405c6 | 572 | scope = strjoin("session-", s->id, ".scope"); |
d0af76e6 | 573 | if (!scope) |
ae018d9b LP |
574 | return log_oom(); |
575 | ||
81d62103 | 576 | description = strjoina("Session ", s->id, " of user ", s->user->name); |
90558f31 LP |
577 | |
578 | r = manager_start_scope( | |
579 | s->manager, | |
580 | scope, | |
581 | s->leader, | |
582 | s->user->slice, | |
583 | description, | |
584 | "systemd-logind.service", | |
585 | "systemd-user-sessions.service", | |
586 | (uint64_t) -1, /* disable TasksMax= for the scope, rely on the slice setting for it */ | |
587 | &error, | |
588 | &job); | |
d0af76e6 | 589 | if (r < 0) { |
90558f31 | 590 | log_error_errno(r, "Failed to start session scope %s: %s", scope, bus_error_message(&error, r)); |
d0af76e6 | 591 | free(scope); |
f2d4f98d | 592 | return r; |
d0af76e6 LP |
593 | } else { |
594 | s->scope = scope; | |
595 | ||
596 | free(s->scope_job); | |
597 | s->scope_job = job; | |
598 | } | |
20263082 LP |
599 | } |
600 | ||
d0af76e6 | 601 | if (s->scope) |
90558f31 | 602 | (void) hashmap_put(s->manager->session_units, s->scope, s); |
d0af76e6 | 603 | |
20263082 LP |
604 | return 0; |
605 | } | |
606 | ||
607 | int session_start(Session *s) { | |
608 | int r; | |
609 | ||
610 | assert(s); | |
9444b1f2 LP |
611 | |
612 | if (!s->user) | |
613 | return -ESTALE; | |
20263082 | 614 | |
9418f147 LP |
615 | if (s->started) |
616 | return 0; | |
617 | ||
ed18b08b LP |
618 | r = user_start(s->user); |
619 | if (r < 0) | |
620 | return r; | |
621 | ||
fb6becb4 LP |
622 | /* Create cgroup */ |
623 | r = session_start_scope(s); | |
624 | if (r < 0) | |
625 | return r; | |
626 | ||
d9eb81f9 | 627 | log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO, |
2b044526 | 628 | "MESSAGE_ID=" SD_MESSAGE_SESSION_START_STR, |
877d54e9 LP |
629 | "SESSION_ID=%s", s->id, |
630 | "USER_ID=%s", s->user->name, | |
de0671ee | 631 | "LEADER="PID_FMT, s->leader, |
e2cc6eca | 632 | LOG_MESSAGE("New session %s of user %s.", s->id, s->user->name), |
877d54e9 | 633 | NULL); |
98a28fef | 634 | |
9444b1f2 LP |
635 | if (!dual_timestamp_is_set(&s->timestamp)) |
636 | dual_timestamp_get(&s->timestamp); | |
14c3baca | 637 | |
e9816c48 LP |
638 | if (s->seat) |
639 | seat_read_active_vt(s->seat); | |
640 | ||
9418f147 LP |
641 | s->started = true; |
642 | ||
952d3260 LP |
643 | user_elect_display(s->user); |
644 | ||
5f41d1f1 | 645 | /* Save data */ |
e9816c48 | 646 | session_save(s); |
7f7bb946 | 647 | user_save(s->user); |
5f41d1f1 LP |
648 | if (s->seat) |
649 | seat_save(s->seat); | |
e9816c48 | 650 | |
5f41d1f1 | 651 | /* Send signals */ |
da119395 | 652 | session_send_signal(s, true); |
7d049e30 | 653 | user_send_changed(s->user, "Display", NULL); |
9418f147 LP |
654 | if (s->seat) { |
655 | if (s->seat->active == s) | |
7d049e30 | 656 | seat_send_changed(s->seat, "ActiveSession", NULL); |
9418f147 LP |
657 | } |
658 | ||
20263082 LP |
659 | return 0; |
660 | } | |
661 | ||
9bb69af4 | 662 | static int session_stop_scope(Session *s, bool force) { |
4afd3348 | 663 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; |
20263082 | 664 | int r; |
20263082 LP |
665 | |
666 | assert(s); | |
667 | ||
fb6becb4 LP |
668 | if (!s->scope) |
669 | return 0; | |
9b221b63 | 670 | |
756ed0e2 | 671 | /* Let's always abandon the scope first. This tells systemd that we are not interested anymore, and everything |
629ff674 | 672 | * that is left in the scope is "left-over". Informing systemd about this has the benefit that it will log |
756ed0e2 LP |
673 | * when killing any processes left after this point. */ |
674 | r = manager_abandon_scope(s->manager, s->scope, &error); | |
675 | if (r < 0) | |
676 | log_warning_errno(r, "Failed to abandon session scope, ignoring: %s", bus_error_message(&error, r)); | |
677 | ||
678 | /* Optionally, let's kill everything that's left now. */ | |
9bb69af4 | 679 | if (force || manager_shall_kill(s->manager, s->user->name)) { |
801a884d LP |
680 | char *job = NULL; |
681 | ||
5f41d1f1 | 682 | r = manager_stop_unit(s->manager, s->scope, &error, &job); |
801a884d LP |
683 | if (r < 0) |
684 | return log_error_errno(r, "Failed to stop session scope: %s", bus_error_message(&error, r)); | |
20263082 | 685 | |
5f41d1f1 LP |
686 | free(s->scope_job); |
687 | s->scope_job = job; | |
756ed0e2 LP |
688 | } else |
689 | s->scope_job = mfree(s->scope_job); | |
20263082 | 690 | |
9b221b63 | 691 | return 0; |
20263082 LP |
692 | } |
693 | ||
9bb69af4 | 694 | int session_stop(Session *s, bool force) { |
405e0255 LP |
695 | int r; |
696 | ||
697 | assert(s); | |
698 | ||
699 | if (!s->user) | |
700 | return -ESTALE; | |
701 | ||
5f41d1f1 LP |
702 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
703 | ||
10189fd6 DH |
704 | if (s->seat) |
705 | seat_evict_position(s->seat, s); | |
706 | ||
5f41d1f1 LP |
707 | /* We are going down, don't care about FIFOs anymore */ |
708 | session_remove_fifo(s); | |
709 | ||
405e0255 | 710 | /* Kill cgroup */ |
9bb69af4 | 711 | r = session_stop_scope(s, force); |
405e0255 | 712 | |
5f41d1f1 LP |
713 | s->stopping = true; |
714 | ||
952d3260 LP |
715 | user_elect_display(s->user); |
716 | ||
405e0255 | 717 | session_save(s); |
cc377381 | 718 | user_save(s->user); |
405e0255 LP |
719 | |
720 | return r; | |
721 | } | |
722 | ||
723 | int session_finalize(Session *s) { | |
118ecf32 | 724 | SessionDevice *sd; |
20263082 LP |
725 | |
726 | assert(s); | |
727 | ||
9444b1f2 LP |
728 | if (!s->user) |
729 | return -ESTALE; | |
730 | ||
ed18b08b | 731 | if (s->started) |
d9eb81f9 | 732 | log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO, |
2b044526 | 733 | "MESSAGE_ID=" SD_MESSAGE_SESSION_STOP_STR, |
877d54e9 LP |
734 | "SESSION_ID=%s", s->id, |
735 | "USER_ID=%s", s->user->name, | |
de0671ee | 736 | "LEADER="PID_FMT, s->leader, |
e2cc6eca | 737 | LOG_MESSAGE("Removed session %s.", s->id), |
877d54e9 | 738 | NULL); |
98a28fef | 739 | |
5f41d1f1 LP |
740 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
741 | ||
10189fd6 DH |
742 | if (s->seat) |
743 | seat_evict_position(s->seat, s); | |
744 | ||
118ecf32 DH |
745 | /* Kill session devices */ |
746 | while ((sd = hashmap_first(s->devices))) | |
747 | session_device_free(sd); | |
748 | ||
491ac9f2 | 749 | (void) unlink(s->state_file); |
d2f92cdf | 750 | session_add_to_gc_queue(s); |
ed18b08b | 751 | user_add_to_gc_queue(s->user); |
14c3baca | 752 | |
405e0255 | 753 | if (s->started) { |
ed18b08b | 754 | session_send_signal(s, false); |
405e0255 LP |
755 | s->started = false; |
756 | } | |
50fb9793 | 757 | |
9418f147 LP |
758 | if (s->seat) { |
759 | if (s->seat->active == s) | |
760 | seat_set_active(s->seat, NULL); | |
761 | ||
23bd3b62 | 762 | seat_save(s->seat); |
9418f147 LP |
763 | } |
764 | ||
23bd3b62 | 765 | user_save(s->user); |
7d049e30 | 766 | user_send_changed(s->user, "Display", NULL); |
9418f147 | 767 | |
491ac9f2 | 768 | return 0; |
20263082 LP |
769 | } |
770 | ||
5f41d1f1 LP |
771 | static int release_timeout_callback(sd_event_source *es, uint64_t usec, void *userdata) { |
772 | Session *s = userdata; | |
773 | ||
774 | assert(es); | |
775 | assert(s); | |
776 | ||
9bb69af4 | 777 | session_stop(s, false); |
5f41d1f1 LP |
778 | return 0; |
779 | } | |
780 | ||
ad8780c9 | 781 | int session_release(Session *s) { |
5f41d1f1 LP |
782 | assert(s); |
783 | ||
784 | if (!s->started || s->stopping) | |
ad8780c9 ZJS |
785 | return 0; |
786 | ||
787 | if (s->timer_event_source) | |
788 | return 0; | |
789 | ||
790 | return sd_event_add_time(s->manager->event, | |
791 | &s->timer_event_source, | |
792 | CLOCK_MONOTONIC, | |
793 | now(CLOCK_MONOTONIC) + RELEASE_USEC, 0, | |
794 | release_timeout_callback, s); | |
5f41d1f1 LP |
795 | } |
796 | ||
20263082 LP |
797 | bool session_is_active(Session *s) { |
798 | assert(s); | |
799 | ||
800 | if (!s->seat) | |
801 | return true; | |
802 | ||
803 | return s->seat->active == s; | |
804 | } | |
805 | ||
23406ce5 LP |
806 | static int get_tty_atime(const char *tty, usec_t *atime) { |
807 | _cleanup_free_ char *p = NULL; | |
a185c5aa | 808 | struct stat st; |
23406ce5 LP |
809 | |
810 | assert(tty); | |
811 | assert(atime); | |
812 | ||
813 | if (!path_is_absolute(tty)) { | |
814 | p = strappend("/dev/", tty); | |
815 | if (!p) | |
816 | return -ENOMEM; | |
817 | ||
818 | tty = p; | |
819 | } else if (!path_startswith(tty, "/dev/")) | |
820 | return -ENOENT; | |
821 | ||
822 | if (lstat(tty, &st) < 0) | |
823 | return -errno; | |
824 | ||
825 | *atime = timespec_load(&st.st_atim); | |
826 | return 0; | |
827 | } | |
828 | ||
829 | static int get_process_ctty_atime(pid_t pid, usec_t *atime) { | |
830 | _cleanup_free_ char *p = NULL; | |
831 | int r; | |
832 | ||
833 | assert(pid > 0); | |
834 | assert(atime); | |
835 | ||
836 | r = get_ctty(pid, NULL, &p); | |
837 | if (r < 0) | |
838 | return r; | |
839 | ||
840 | return get_tty_atime(p, atime); | |
841 | } | |
842 | ||
843 | int session_get_idle_hint(Session *s, dual_timestamp *t) { | |
23406ce5 LP |
844 | usec_t atime = 0, n; |
845 | int r; | |
a185c5aa LP |
846 | |
847 | assert(s); | |
848 | ||
23406ce5 | 849 | /* Explicit idle hint is set */ |
a185c5aa LP |
850 | if (s->idle_hint) { |
851 | if (t) | |
852 | *t = s->idle_hint_timestamp; | |
853 | ||
854 | return s->idle_hint; | |
855 | } | |
856 | ||
0762eaa3 | 857 | /* Graphical sessions should really implement a real |
23406ce5 | 858 | * idle hint logic */ |
129baf1b | 859 | if (SESSION_TYPE_IS_GRAPHICAL(s->type)) |
a185c5aa LP |
860 | goto dont_know; |
861 | ||
23406ce5 LP |
862 | /* For sessions with an explicitly configured tty, let's check |
863 | * its atime */ | |
864 | if (s->tty) { | |
865 | r = get_tty_atime(s->tty, &atime); | |
866 | if (r >= 0) | |
867 | goto found_atime; | |
868 | } | |
a185c5aa | 869 | |
23406ce5 LP |
870 | /* For sessions with a leader but no explicitly configured |
871 | * tty, let's check the controlling tty of the leader */ | |
872 | if (s->leader > 0) { | |
873 | r = get_process_ctty_atime(s->leader, &atime); | |
874 | if (r >= 0) | |
875 | goto found_atime; | |
a185c5aa LP |
876 | } |
877 | ||
a185c5aa LP |
878 | dont_know: |
879 | if (t) | |
880 | *t = s->idle_hint_timestamp; | |
881 | ||
882 | return 0; | |
23406ce5 LP |
883 | |
884 | found_atime: | |
885 | if (t) | |
886 | dual_timestamp_from_realtime(t, atime); | |
887 | ||
888 | n = now(CLOCK_REALTIME); | |
889 | ||
890 | if (s->manager->idle_action_usec <= 0) | |
891 | return 0; | |
892 | ||
893 | return atime + s->manager->idle_action_usec <= n; | |
a185c5aa LP |
894 | } |
895 | ||
bef422ae LP |
896 | void session_set_idle_hint(Session *s, bool b) { |
897 | assert(s); | |
898 | ||
899 | if (s->idle_hint == b) | |
900 | return; | |
901 | ||
902 | s->idle_hint = b; | |
903 | dual_timestamp_get(&s->idle_hint_timestamp); | |
9418f147 | 904 | |
cc377381 | 905 | session_send_changed(s, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); |
9418f147 LP |
906 | |
907 | if (s->seat) | |
cc377381 LP |
908 | seat_send_changed(s->seat, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); |
909 | ||
910 | user_send_changed(s->user, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); | |
911 | manager_send_changed(s->manager, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); | |
912 | } | |
913 | ||
42d35e13 VT |
914 | int session_get_locked_hint(Session *s) { |
915 | assert(s); | |
916 | ||
917 | return s->locked_hint; | |
918 | } | |
919 | ||
920 | void session_set_locked_hint(Session *s, bool b) { | |
921 | assert(s); | |
922 | ||
923 | if (s->locked_hint == b) | |
924 | return; | |
925 | ||
926 | s->locked_hint = b; | |
927 | ||
928 | session_send_changed(s, "LockedHint", NULL); | |
929 | } | |
930 | ||
cc377381 LP |
931 | static int session_dispatch_fifo(sd_event_source *es, int fd, uint32_t revents, void *userdata) { |
932 | Session *s = userdata; | |
933 | ||
934 | assert(s); | |
935 | assert(s->fifo_fd == fd); | |
936 | ||
937 | /* EOF on the FIFO means the session died abnormally. */ | |
938 | ||
939 | session_remove_fifo(s); | |
9bb69af4 | 940 | session_stop(s, false); |
cc377381 LP |
941 | |
942 | return 1; | |
bef422ae LP |
943 | } |
944 | ||
932e3ee7 LP |
945 | int session_create_fifo(Session *s) { |
946 | int r; | |
947 | ||
31b79c2b LP |
948 | assert(s); |
949 | ||
b4f78aea | 950 | /* Create FIFO */ |
932e3ee7 | 951 | if (!s->fifo_path) { |
c31ad024 | 952 | r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0, false); |
e6061ab2 LP |
953 | if (r < 0) |
954 | return r; | |
955 | ||
932e3ee7 LP |
956 | if (asprintf(&s->fifo_path, "/run/systemd/sessions/%s.ref", s->id) < 0) |
957 | return -ENOMEM; | |
31b79c2b | 958 | |
932e3ee7 LP |
959 | if (mkfifo(s->fifo_path, 0600) < 0 && errno != EEXIST) |
960 | return -errno; | |
961 | } | |
31b79c2b | 962 | |
932e3ee7 | 963 | /* Open reading side */ |
b4f78aea | 964 | if (s->fifo_fd < 0) { |
b4f78aea LP |
965 | s->fifo_fd = open(s->fifo_path, O_RDONLY|O_CLOEXEC|O_NDELAY); |
966 | if (s->fifo_fd < 0) | |
967 | return -errno; | |
968 | ||
cc377381 LP |
969 | } |
970 | ||
971 | if (!s->fifo_event_source) { | |
151b9b96 | 972 | r = sd_event_add_io(s->manager->event, &s->fifo_event_source, s->fifo_fd, 0, session_dispatch_fifo, s); |
b4f78aea LP |
973 | if (r < 0) |
974 | return r; | |
975 | ||
e11544a8 LP |
976 | /* Let's make sure we noticed dead sessions before we process new bus requests (which might create new |
977 | * sessions). */ | |
978 | r = sd_event_source_set_priority(s->fifo_event_source, SD_EVENT_PRIORITY_NORMAL-10); | |
cc377381 LP |
979 | if (r < 0) |
980 | return r; | |
b4f78aea | 981 | } |
932e3ee7 LP |
982 | |
983 | /* Open writing side */ | |
984 | r = open(s->fifo_path, O_WRONLY|O_CLOEXEC|O_NDELAY); | |
985 | if (r < 0) | |
986 | return -errno; | |
31b79c2b | 987 | |
932e3ee7 LP |
988 | return r; |
989 | } | |
990 | ||
5f41d1f1 | 991 | static void session_remove_fifo(Session *s) { |
932e3ee7 LP |
992 | assert(s); |
993 | ||
03e334a1 LP |
994 | s->fifo_event_source = sd_event_source_unref(s->fifo_event_source); |
995 | s->fifo_fd = safe_close(s->fifo_fd); | |
932e3ee7 LP |
996 | |
997 | if (s->fifo_path) { | |
998 | unlink(s->fifo_path); | |
a1e58e8e | 999 | s->fifo_path = mfree(s->fifo_path); |
932e3ee7 | 1000 | } |
31b79c2b LP |
1001 | } |
1002 | ||
cc377381 | 1003 | bool session_check_gc(Session *s, bool drop_not_started) { |
20263082 LP |
1004 | assert(s); |
1005 | ||
4a4b033f | 1006 | if (drop_not_started && !s->started) |
cc377381 | 1007 | return false; |
932e3ee7 | 1008 | |
9444b1f2 | 1009 | if (!s->user) |
cc377381 | 1010 | return false; |
9444b1f2 | 1011 | |
932e3ee7 | 1012 | if (s->fifo_fd >= 0) { |
5f41d1f1 | 1013 | if (pipe_eof(s->fifo_fd) <= 0) |
cc377381 | 1014 | return true; |
20263082 LP |
1015 | } |
1016 | ||
cc377381 LP |
1017 | if (s->scope_job && manager_job_is_active(s->manager, s->scope_job)) |
1018 | return true; | |
20263082 | 1019 | |
cc377381 LP |
1020 | if (s->scope && manager_unit_is_active(s->manager, s->scope)) |
1021 | return true; | |
20263082 | 1022 | |
cc377381 | 1023 | return false; |
20263082 LP |
1024 | } |
1025 | ||
14c3baca LP |
1026 | void session_add_to_gc_queue(Session *s) { |
1027 | assert(s); | |
1028 | ||
1029 | if (s->in_gc_queue) | |
1030 | return; | |
1031 | ||
71fda00f | 1032 | LIST_PREPEND(gc_queue, s->manager->session_gc_queue, s); |
14c3baca LP |
1033 | s->in_gc_queue = true; |
1034 | } | |
1035 | ||
0604381b LP |
1036 | SessionState session_get_state(Session *s) { |
1037 | assert(s); | |
1038 | ||
8fe63cd4 | 1039 | /* always check closing first */ |
5f41d1f1 LP |
1040 | if (s->stopping || s->timer_event_source) |
1041 | return SESSION_CLOSING; | |
1042 | ||
8fe63cd4 | 1043 | if (s->scope_job || s->fifo_fd < 0) |
405e0255 | 1044 | return SESSION_OPENING; |
fb6becb4 | 1045 | |
0604381b LP |
1046 | if (session_is_active(s)) |
1047 | return SESSION_ACTIVE; | |
1048 | ||
1049 | return SESSION_ONLINE; | |
1050 | } | |
1051 | ||
de07ab16 | 1052 | int session_kill(Session *s, KillWho who, int signo) { |
de07ab16 LP |
1053 | assert(s); |
1054 | ||
fb6becb4 | 1055 | if (!s->scope) |
de07ab16 LP |
1056 | return -ESRCH; |
1057 | ||
fb6becb4 | 1058 | return manager_kill_unit(s->manager, s->scope, who, signo, NULL); |
de07ab16 LP |
1059 | } |
1060 | ||
90a18413 | 1061 | static int session_open_vt(Session *s) { |
5f41d1f1 | 1062 | char path[sizeof("/dev/tty") + DECIMAL_STR_MAX(s->vtnr)]; |
90a18413 | 1063 | |
baccf3e4 OB |
1064 | if (s->vtnr < 1) |
1065 | return -ENODEV; | |
90a18413 DH |
1066 | |
1067 | if (s->vtfd >= 0) | |
1068 | return s->vtfd; | |
1069 | ||
92bd5ff3 | 1070 | sprintf(path, "/dev/tty%u", s->vtnr); |
22356953 | 1071 | s->vtfd = open_terminal(path, O_RDWR | O_CLOEXEC | O_NONBLOCK | O_NOCTTY); |
4a62c710 | 1072 | if (s->vtfd < 0) |
709f6e46 | 1073 | return log_error_errno(s->vtfd, "cannot open VT %s of session %s: %m", path, s->id); |
90a18413 DH |
1074 | |
1075 | return s->vtfd; | |
1076 | } | |
1077 | ||
baccf3e4 | 1078 | int session_prepare_vt(Session *s) { |
90a18413 DH |
1079 | int vt, r; |
1080 | struct vt_mode mode = { 0 }; | |
90a18413 | 1081 | |
baccf3e4 OB |
1082 | if (s->vtnr < 1) |
1083 | return 0; | |
1084 | ||
90a18413 DH |
1085 | vt = session_open_vt(s); |
1086 | if (vt < 0) | |
baccf3e4 | 1087 | return vt; |
90a18413 | 1088 | |
d6176c6c | 1089 | r = fchown(vt, s->user->uid, -1); |
baccf3e4 | 1090 | if (r < 0) { |
94c156cd LP |
1091 | r = log_error_errno(errno, |
1092 | "Cannot change owner of /dev/tty%u: %m", | |
1093 | s->vtnr); | |
d6176c6c | 1094 | goto error; |
baccf3e4 | 1095 | } |
d6176c6c | 1096 | |
90a18413 | 1097 | r = ioctl(vt, KDSKBMODE, K_OFF); |
baccf3e4 | 1098 | if (r < 0) { |
94c156cd LP |
1099 | r = log_error_errno(errno, |
1100 | "Cannot set K_OFF on /dev/tty%u: %m", | |
1101 | s->vtnr); | |
90a18413 | 1102 | goto error; |
baccf3e4 | 1103 | } |
90a18413 DH |
1104 | |
1105 | r = ioctl(vt, KDSETMODE, KD_GRAPHICS); | |
baccf3e4 | 1106 | if (r < 0) { |
94c156cd LP |
1107 | r = log_error_errno(errno, |
1108 | "Cannot set KD_GRAPHICS on /dev/tty%u: %m", | |
1109 | s->vtnr); | |
90a18413 | 1110 | goto error; |
baccf3e4 | 1111 | } |
90a18413 | 1112 | |
90a18413 DH |
1113 | /* Oh, thanks to the VT layer, VT_AUTO does not work with KD_GRAPHICS. |
1114 | * So we need a dummy handler here which just acknowledges *all* VT | |
1115 | * switch requests. */ | |
1116 | mode.mode = VT_PROCESS; | |
92683ad2 DH |
1117 | mode.relsig = SIGRTMIN; |
1118 | mode.acqsig = SIGRTMIN + 1; | |
90a18413 | 1119 | r = ioctl(vt, VT_SETMODE, &mode); |
baccf3e4 | 1120 | if (r < 0) { |
94c156cd LP |
1121 | r = log_error_errno(errno, |
1122 | "Cannot set VT_PROCESS on /dev/tty%u: %m", | |
1123 | s->vtnr); | |
90a18413 | 1124 | goto error; |
baccf3e4 | 1125 | } |
90a18413 | 1126 | |
baccf3e4 | 1127 | return 0; |
90a18413 DH |
1128 | |
1129 | error: | |
90a18413 | 1130 | session_restore_vt(s); |
baccf3e4 | 1131 | return r; |
90a18413 DH |
1132 | } |
1133 | ||
1134 | void session_restore_vt(Session *s) { | |
16597ac3 LP |
1135 | |
1136 | static const struct vt_mode mode = { | |
1137 | .mode = VT_AUTO, | |
1138 | }; | |
1139 | ||
c83f349c | 1140 | int vt, old_fd; |
90a18413 | 1141 | |
128df4cf OT |
1142 | /* We need to get a fresh handle to the virtual terminal, |
1143 | * since the old file-descriptor is potentially in a hung-up | |
1144 | * state after the controlling process exited; we do a | |
1145 | * little dance to avoid having the terminal be available | |
1146 | * for reuse before we've cleaned it up. | |
1147 | */ | |
16597ac3 | 1148 | old_fd = s->vtfd; |
128df4cf OT |
1149 | s->vtfd = -1; |
1150 | ||
90a18413 | 1151 | vt = session_open_vt(s); |
128df4cf OT |
1152 | safe_close(old_fd); |
1153 | ||
90a18413 DH |
1154 | if (vt < 0) |
1155 | return; | |
1156 | ||
2bf10523 | 1157 | (void) ioctl(vt, KDSETMODE, KD_TEXT); |
90a18413 | 1158 | |
c83f349c | 1159 | (void) vt_reset_keyboard(vt); |
90a18413 | 1160 | |
2bf10523 | 1161 | (void) ioctl(vt, VT_SETMODE, &mode); |
16597ac3 | 1162 | (void) fchown(vt, 0, (gid_t) -1); |
d6176c6c | 1163 | |
03e334a1 | 1164 | s->vtfd = safe_close(s->vtfd); |
90a18413 DH |
1165 | } |
1166 | ||
2ec3ff66 | 1167 | void session_leave_vt(Session *s) { |
ce540a24 DH |
1168 | int r; |
1169 | ||
2ec3ff66 DH |
1170 | assert(s); |
1171 | ||
1172 | /* This is called whenever we get a VT-switch signal from the kernel. | |
1173 | * We acknowledge all of them unconditionally. Note that session are | |
1174 | * free to overwrite those handlers and we only register them for | |
1175 | * sessions with controllers. Legacy sessions are not affected. | |
1176 | * However, if we switch from a non-legacy to a legacy session, we must | |
1177 | * make sure to pause all device before acknowledging the switch. We | |
1178 | * process the real switch only after we are notified via sysfs, so the | |
1179 | * legacy session might have already started using the devices. If we | |
1180 | * don't pause the devices before the switch, we might confuse the | |
1181 | * session we switch to. */ | |
1182 | ||
1183 | if (s->vtfd < 0) | |
1184 | return; | |
1185 | ||
1186 | session_device_pause_all(s); | |
ce540a24 DH |
1187 | r = ioctl(s->vtfd, VT_RELDISP, 1); |
1188 | if (r < 0) | |
56f64d95 | 1189 | log_debug_errno(errno, "Cannot release VT of session %s: %m", s->id); |
2ec3ff66 DH |
1190 | } |
1191 | ||
cc377381 | 1192 | bool session_is_controller(Session *s, const char *sender) { |
ae5e06bd DH |
1193 | assert(s); |
1194 | ||
1195 | return streq_ptr(s->controller, sender); | |
1196 | } | |
1197 | ||
b12e5615 DH |
1198 | static void session_release_controller(Session *s, bool notify) { |
1199 | _cleanup_free_ char *name = NULL; | |
6d33772f DH |
1200 | SessionDevice *sd; |
1201 | ||
b12e5615 DH |
1202 | if (!s->controller) |
1203 | return; | |
6d33772f | 1204 | |
b12e5615 | 1205 | name = s->controller; |
90a18413 | 1206 | |
b12e5615 DH |
1207 | /* By resetting the controller before releasing the devices, we won't |
1208 | * send notification signals. This avoids sending useless notifications | |
1209 | * if the controller is released on disconnects. */ | |
1210 | if (!notify) | |
1211 | s->controller = NULL; | |
6d33772f | 1212 | |
b12e5615 DH |
1213 | while ((sd = hashmap_first(s->devices))) |
1214 | session_device_free(sd); | |
1215 | ||
1216 | s->controller = NULL; | |
3cde9e8f DM |
1217 | s->track = sd_bus_track_unref(s->track); |
1218 | } | |
1219 | ||
1220 | static int on_bus_track(sd_bus_track *track, void *userdata) { | |
1221 | Session *s = userdata; | |
1222 | ||
1223 | assert(track); | |
1224 | assert(s); | |
1225 | ||
1226 | session_drop_controller(s); | |
1227 | ||
1228 | return 0; | |
6d33772f DH |
1229 | } |
1230 | ||
dc6284e9 | 1231 | int session_set_controller(Session *s, const char *sender, bool force, bool prepare) { |
b12e5615 | 1232 | _cleanup_free_ char *name = NULL; |
ae5e06bd DH |
1233 | int r; |
1234 | ||
1235 | assert(s); | |
1236 | assert(sender); | |
1237 | ||
1238 | if (session_is_controller(s, sender)) | |
1239 | return 0; | |
1240 | if (s->controller && !force) | |
1241 | return -EBUSY; | |
1242 | ||
b12e5615 DH |
1243 | name = strdup(sender); |
1244 | if (!name) | |
ae5e06bd DH |
1245 | return -ENOMEM; |
1246 | ||
3cde9e8f DM |
1247 | s->track = sd_bus_track_unref(s->track); |
1248 | r = sd_bus_track_new(s->manager->bus, &s->track, on_bus_track, s); | |
1249 | if (r < 0) | |
1250 | return r; | |
1251 | ||
1252 | r = sd_bus_track_add_name(s->track, name); | |
1253 | if (r < 0) | |
ae5e06bd | 1254 | return r; |
ae5e06bd | 1255 | |
90a18413 DH |
1256 | /* When setting a session controller, we forcibly mute the VT and set |
1257 | * it into graphics-mode. Applications can override that by changing | |
1258 | * VT state after calling TakeControl(). However, this serves as a good | |
1259 | * default and well-behaving controllers can now ignore VTs entirely. | |
1260 | * Note that we reset the VT on ReleaseControl() and if the controller | |
1261 | * exits. | |
1262 | * If logind crashes/restarts, we restore the controller during restart | |
dc6284e9 FB |
1263 | * (without preparing the VT since the controller has probably overridden |
1264 | * VT state by now) or reset the VT in case it crashed/exited, too. */ | |
1265 | if (prepare) { | |
1266 | r = session_prepare_vt(s); | |
1267 | if (r < 0) { | |
1268 | s->track = sd_bus_track_unref(s->track); | |
1269 | return r; | |
1270 | } | |
13f493dc | 1271 | } |
baccf3e4 | 1272 | |
b12e5615 DH |
1273 | session_release_controller(s, true); |
1274 | s->controller = name; | |
1275 | name = NULL; | |
1276 | session_save(s); | |
90a18413 | 1277 | |
ae5e06bd DH |
1278 | return 0; |
1279 | } | |
1280 | ||
1281 | void session_drop_controller(Session *s) { | |
1282 | assert(s); | |
1283 | ||
1284 | if (!s->controller) | |
1285 | return; | |
1286 | ||
3cde9e8f | 1287 | s->track = sd_bus_track_unref(s->track); |
b12e5615 DH |
1288 | session_release_controller(s, false); |
1289 | session_save(s); | |
1290 | session_restore_vt(s); | |
ae5e06bd DH |
1291 | } |
1292 | ||
fb6becb4 LP |
1293 | static const char* const session_state_table[_SESSION_STATE_MAX] = { |
1294 | [SESSION_OPENING] = "opening", | |
0604381b LP |
1295 | [SESSION_ONLINE] = "online", |
1296 | [SESSION_ACTIVE] = "active", | |
1297 | [SESSION_CLOSING] = "closing" | |
1298 | }; | |
1299 | ||
1300 | DEFINE_STRING_TABLE_LOOKUP(session_state, SessionState); | |
1301 | ||
20263082 | 1302 | static const char* const session_type_table[_SESSION_TYPE_MAX] = { |
2c5859af | 1303 | [SESSION_UNSPECIFIED] = "unspecified", |
3f49d45a | 1304 | [SESSION_TTY] = "tty", |
98a28fef | 1305 | [SESSION_X11] = "x11", |
d9eb81f9 | 1306 | [SESSION_WAYLAND] = "wayland", |
9541666b | 1307 | [SESSION_MIR] = "mir", |
e9e74f28 | 1308 | [SESSION_WEB] = "web", |
20263082 LP |
1309 | }; |
1310 | ||
1311 | DEFINE_STRING_TABLE_LOOKUP(session_type, SessionType); | |
de07ab16 | 1312 | |
55efac6c LP |
1313 | static const char* const session_class_table[_SESSION_CLASS_MAX] = { |
1314 | [SESSION_USER] = "user", | |
1315 | [SESSION_GREETER] = "greeter", | |
e2acb67b LP |
1316 | [SESSION_LOCK_SCREEN] = "lock-screen", |
1317 | [SESSION_BACKGROUND] = "background" | |
55efac6c LP |
1318 | }; |
1319 | ||
1320 | DEFINE_STRING_TABLE_LOOKUP(session_class, SessionClass); | |
1321 | ||
de07ab16 LP |
1322 | static const char* const kill_who_table[_KILL_WHO_MAX] = { |
1323 | [KILL_LEADER] = "leader", | |
1324 | [KILL_ALL] = "all" | |
1325 | }; | |
1326 | ||
1327 | DEFINE_STRING_TABLE_LOOKUP(kill_who, KillWho); |