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20263082 LP |
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 | |
5430f7f2 LP |
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 | |
20263082 LP |
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 | |
5430f7f2 | 16 | Lesser General Public License for more details. |
20263082 | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
20263082 LP |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
22 | #include <errno.h> | |
90a18413 | 23 | #include <fcntl.h> |
90a18413 | 24 | #include <linux/kd.h> |
4f5dd394 | 25 | #include <linux/vt.h> |
90a18413 | 26 | #include <signal.h> |
20263082 | 27 | #include <string.h> |
90a18413 | 28 | #include <sys/ioctl.h> |
20263082 LP |
29 | #include <unistd.h> |
30 | ||
cc377381 | 31 | #include "sd-messages.h" |
4f5dd394 | 32 | |
cc377381 | 33 | #include "audit.h" |
cc377381 | 34 | #include "bus-error.h" |
4f5dd394 LP |
35 | #include "bus-util.h" |
36 | #include "escape.h" | |
3ffd4af2 | 37 | #include "fd-util.h" |
c004493c | 38 | #include "fd-util.h" |
4f5dd394 | 39 | #include "fileio.h" |
6482f626 | 40 | #include "formats-util.h" |
c004493c | 41 | #include "io-util.h" |
3ffd4af2 | 42 | #include "logind-session.h" |
4f5dd394 LP |
43 | #include "mkdir.h" |
44 | #include "path-util.h" | |
288a74cc | 45 | #include "terminal-util.h" |
4f5dd394 | 46 | #include "util.h" |
20263082 | 47 | |
5f41d1f1 LP |
48 | #define RELEASE_USEC (20*USEC_PER_SEC) |
49 | ||
50 | static void session_remove_fifo(Session *s); | |
51 | ||
9444b1f2 | 52 | Session* session_new(Manager *m, const char *id) { |
20263082 LP |
53 | Session *s; |
54 | ||
55 | assert(m); | |
56 | assert(id); | |
4b549144 | 57 | assert(session_id_valid(id)); |
20263082 | 58 | |
14c3baca | 59 | s = new0(Session, 1); |
20263082 LP |
60 | if (!s) |
61 | return NULL; | |
62 | ||
98a28fef | 63 | s->state_file = strappend("/run/systemd/sessions/", id); |
20263082 LP |
64 | if (!s->state_file) { |
65 | free(s); | |
66 | return NULL; | |
67 | } | |
68 | ||
d5099efc | 69 | s->devices = hashmap_new(&devt_hash_ops); |
118ecf32 DH |
70 | if (!s->devices) { |
71 | free(s->state_file); | |
72 | free(s); | |
73 | return NULL; | |
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); |
20263082 LP |
81 | free(s); |
82 | return NULL; | |
83 | } | |
84 | ||
85 | s->manager = m; | |
932e3ee7 | 86 | s->fifo_fd = -1; |
90a18413 | 87 | s->vtfd = -1; |
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 | ||
20263082 | 158 | int session_save(Session *s) { |
507f22bd | 159 | _cleanup_free_ char *temp_path = NULL; |
cc377381 | 160 | _cleanup_fclose_ FILE *f = NULL; |
20263082 LP |
161 | int r = 0; |
162 | ||
163 | assert(s); | |
164 | ||
9444b1f2 LP |
165 | if (!s->user) |
166 | return -ESTALE; | |
167 | ||
accaeded LP |
168 | if (!s->started) |
169 | return 0; | |
170 | ||
d2e54fae | 171 | r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0); |
20263082 | 172 | if (r < 0) |
dacd6cee | 173 | goto fail; |
20263082 | 174 | |
14c3baca LP |
175 | r = fopen_temporary(s->state_file, &f, &temp_path); |
176 | if (r < 0) | |
dacd6cee | 177 | goto fail; |
20263082 LP |
178 | |
179 | assert(s->user); | |
180 | ||
14c3baca LP |
181 | fchmod(fileno(f), 0644); |
182 | ||
20263082 LP |
183 | fprintf(f, |
184 | "# This is private data. Do not parse.\n" | |
90b2de37 | 185 | "UID="UID_FMT"\n" |
20263082 LP |
186 | "USER=%s\n" |
187 | "ACTIVE=%i\n" | |
0604381b | 188 | "STATE=%s\n" |
fb6becb4 | 189 | "REMOTE=%i\n", |
90b2de37 | 190 | s->user->uid, |
20263082 LP |
191 | s->user->name, |
192 | session_is_active(s), | |
0604381b | 193 | session_state_to_string(session_get_state(s)), |
fb6becb4 | 194 | s->remote); |
20263082 | 195 | |
a91e4e53 | 196 | if (s->type >= 0) |
507f22bd | 197 | fprintf(f, "TYPE=%s\n", session_type_to_string(s->type)); |
a91e4e53 | 198 | |
55efac6c | 199 | if (s->class >= 0) |
507f22bd | 200 | fprintf(f, "CLASS=%s\n", session_class_to_string(s->class)); |
55efac6c | 201 | |
fb6becb4 LP |
202 | if (s->scope) |
203 | fprintf(f, "SCOPE=%s\n", s->scope); | |
fb6becb4 LP |
204 | if (s->scope_job) |
205 | fprintf(f, "SCOPE_JOB=%s\n", s->scope_job); | |
20263082 | 206 | |
932e3ee7 | 207 | if (s->fifo_path) |
507f22bd | 208 | fprintf(f, "FIFO=%s\n", s->fifo_path); |
932e3ee7 | 209 | |
20263082 | 210 | if (s->seat) |
507f22bd | 211 | fprintf(f, "SEAT=%s\n", s->seat->id); |
20263082 LP |
212 | |
213 | if (s->tty) | |
507f22bd | 214 | fprintf(f, "TTY=%s\n", s->tty); |
20263082 LP |
215 | |
216 | if (s->display) | |
507f22bd | 217 | fprintf(f, "DISPLAY=%s\n", s->display); |
20263082 | 218 | |
558c6490 LP |
219 | if (s->remote_host) { |
220 | _cleanup_free_ char *escaped; | |
221 | ||
222 | escaped = cescape(s->remote_host); | |
223 | if (!escaped) { | |
224 | r = -ENOMEM; | |
dacd6cee | 225 | goto fail; |
558c6490 LP |
226 | } |
227 | ||
228 | fprintf(f, "REMOTE_HOST=%s\n", escaped); | |
229 | } | |
230 | ||
231 | if (s->remote_user) { | |
232 | _cleanup_free_ char *escaped; | |
233 | ||
234 | escaped = cescape(s->remote_user); | |
235 | if (!escaped) { | |
236 | r = -ENOMEM; | |
dacd6cee | 237 | goto fail; |
558c6490 LP |
238 | } |
239 | ||
240 | fprintf(f, "REMOTE_USER=%s\n", escaped); | |
241 | } | |
242 | ||
243 | if (s->service) { | |
244 | _cleanup_free_ char *escaped; | |
20263082 | 245 | |
558c6490 LP |
246 | escaped = cescape(s->service); |
247 | if (!escaped) { | |
248 | r = -ENOMEM; | |
dacd6cee | 249 | goto fail; |
558c6490 LP |
250 | } |
251 | ||
252 | fprintf(f, "SERVICE=%s\n", escaped); | |
253 | } | |
3f49d45a | 254 | |
558c6490 LP |
255 | if (s->desktop) { |
256 | _cleanup_free_ char *escaped; | |
98a28fef | 257 | |
558c6490 LP |
258 | |
259 | escaped = cescape(s->desktop); | |
260 | if (!escaped) { | |
261 | r = -ENOMEM; | |
dacd6cee | 262 | goto fail; |
558c6490 LP |
263 | } |
264 | ||
265 | fprintf(f, "DESKTOP=%s\n", escaped); | |
266 | } | |
a4cd87e9 | 267 | |
bf7825ae | 268 | if (s->seat && seat_has_vts(s->seat)) |
92bd5ff3 | 269 | fprintf(f, "VTNR=%u\n", s->vtnr); |
20263082 | 270 | |
49e6fdbf | 271 | if (!s->vtnr) |
e6494a07 | 272 | fprintf(f, "POSITION=%u\n", s->position); |
49e6fdbf | 273 | |
20263082 | 274 | if (s->leader > 0) |
90b2de37 | 275 | fprintf(f, "LEADER="PID_FMT"\n", s->leader); |
20263082 LP |
276 | |
277 | if (s->audit_id > 0) | |
507f22bd | 278 | fprintf(f, "AUDIT=%"PRIu32"\n", s->audit_id); |
20263082 | 279 | |
9444b1f2 LP |
280 | if (dual_timestamp_is_set(&s->timestamp)) |
281 | fprintf(f, | |
90b2de37 ZJS |
282 | "REALTIME="USEC_FMT"\n" |
283 | "MONOTONIC="USEC_FMT"\n", | |
284 | s->timestamp.realtime, | |
285 | s->timestamp.monotonic); | |
9444b1f2 | 286 | |
6d33772f DH |
287 | if (s->controller) |
288 | fprintf(f, "CONTROLLER=%s\n", s->controller); | |
289 | ||
dacd6cee LP |
290 | r = fflush_and_check(f); |
291 | if (r < 0) | |
292 | goto fail; | |
14c3baca | 293 | |
dacd6cee | 294 | if (rename(temp_path, s->state_file) < 0) { |
20263082 | 295 | r = -errno; |
dacd6cee | 296 | goto fail; |
20263082 LP |
297 | } |
298 | ||
dacd6cee LP |
299 | return 0; |
300 | ||
301 | fail: | |
302 | (void) unlink(s->state_file); | |
14c3baca | 303 | |
dacd6cee LP |
304 | if (temp_path) |
305 | (void) unlink(temp_path); | |
306 | ||
307 | return log_error_errno(r, "Failed to save session data %s: %m", s->state_file); | |
20263082 LP |
308 | } |
309 | ||
dacd6cee | 310 | |
20263082 | 311 | int session_load(Session *s) { |
9444b1f2 | 312 | _cleanup_free_ char *remote = NULL, |
a185c5aa LP |
313 | *seat = NULL, |
314 | *vtnr = NULL, | |
be94d954 | 315 | *state = NULL, |
e6494a07 | 316 | *position = NULL, |
a185c5aa | 317 | *leader = NULL, |
55efac6c | 318 | *type = NULL, |
9444b1f2 LP |
319 | *class = NULL, |
320 | *uid = NULL, | |
321 | *realtime = NULL, | |
6d33772f DH |
322 | *monotonic = NULL, |
323 | *controller = NULL; | |
a185c5aa LP |
324 | |
325 | int k, r; | |
326 | ||
20263082 LP |
327 | assert(s); |
328 | ||
a185c5aa LP |
329 | r = parse_env_file(s->state_file, NEWLINE, |
330 | "REMOTE", &remote, | |
fb6becb4 LP |
331 | "SCOPE", &s->scope, |
332 | "SCOPE_JOB", &s->scope_job, | |
932e3ee7 | 333 | "FIFO", &s->fifo_path, |
a185c5aa LP |
334 | "SEAT", &seat, |
335 | "TTY", &s->tty, | |
336 | "DISPLAY", &s->display, | |
337 | "REMOTE_HOST", &s->remote_host, | |
338 | "REMOTE_USER", &s->remote_user, | |
98a28fef | 339 | "SERVICE", &s->service, |
a4cd87e9 | 340 | "DESKTOP", &s->desktop, |
a185c5aa | 341 | "VTNR", &vtnr, |
be94d954 | 342 | "STATE", &state, |
e6494a07 | 343 | "POSITION", &position, |
a185c5aa | 344 | "LEADER", &leader, |
a91e4e53 | 345 | "TYPE", &type, |
55efac6c | 346 | "CLASS", &class, |
9444b1f2 LP |
347 | "UID", &uid, |
348 | "REALTIME", &realtime, | |
349 | "MONOTONIC", &monotonic, | |
6d33772f | 350 | "CONTROLLER", &controller, |
a185c5aa LP |
351 | NULL); |
352 | ||
f647962d MS |
353 | if (r < 0) |
354 | return log_error_errno(r, "Failed to read %s: %m", s->state_file); | |
9444b1f2 LP |
355 | |
356 | if (!s->user) { | |
357 | uid_t u; | |
358 | User *user; | |
359 | ||
360 | if (!uid) { | |
361 | log_error("UID not specified for session %s", s->id); | |
362 | return -ENOENT; | |
363 | } | |
364 | ||
365 | r = parse_uid(uid, &u); | |
366 | if (r < 0) { | |
367 | log_error("Failed to parse UID value %s for session %s.", uid, s->id); | |
368 | return r; | |
369 | } | |
370 | ||
8cb4ab00 | 371 | user = hashmap_get(s->manager->users, UID_TO_PTR(u)); |
9444b1f2 LP |
372 | if (!user) { |
373 | log_error("User of session %s not known.", s->id); | |
374 | return -ENOENT; | |
375 | } | |
376 | ||
377 | session_set_user(s, user); | |
378 | } | |
a185c5aa LP |
379 | |
380 | if (remote) { | |
381 | k = parse_boolean(remote); | |
382 | if (k >= 0) | |
383 | s->remote = k; | |
384 | } | |
385 | ||
c506027a DH |
386 | if (vtnr) |
387 | safe_atou(vtnr, &s->vtnr); | |
388 | ||
9418f147 | 389 | if (seat && !s->seat) { |
a185c5aa LP |
390 | Seat *o; |
391 | ||
392 | o = hashmap_get(s->manager->seats, seat); | |
393 | if (o) | |
c506027a DH |
394 | r = seat_attach_session(o, s); |
395 | if (!o || r < 0) | |
396 | log_error("Cannot attach session %s to seat %s", s->id, seat); | |
a185c5aa LP |
397 | } |
398 | ||
c506027a DH |
399 | if (!s->seat || !seat_has_vts(s->seat)) |
400 | s->vtnr = 0; | |
a185c5aa | 401 | |
e6494a07 | 402 | if (position && s->seat) { |
49e6fdbf DH |
403 | unsigned int npos; |
404 | ||
e6494a07 | 405 | safe_atou(position, &npos); |
49e6fdbf DH |
406 | seat_claim_position(s->seat, s, npos); |
407 | } | |
408 | ||
a185c5aa | 409 | if (leader) { |
f8e2fb7b LP |
410 | k = parse_pid(leader, &s->leader); |
411 | if (k >= 0) | |
412 | audit_session_from_pid(s->leader, &s->audit_id); | |
a185c5aa LP |
413 | } |
414 | ||
a91e4e53 LP |
415 | if (type) { |
416 | SessionType t; | |
417 | ||
418 | t = session_type_from_string(type); | |
419 | if (t >= 0) | |
420 | s->type = t; | |
421 | } | |
422 | ||
55efac6c LP |
423 | if (class) { |
424 | SessionClass c; | |
425 | ||
426 | c = session_class_from_string(class); | |
427 | if (c >= 0) | |
428 | s->class = c; | |
429 | } | |
430 | ||
be94d954 MP |
431 | if (state && streq(state, "closing")) |
432 | s->stopping = true; | |
433 | ||
b4f78aea LP |
434 | if (s->fifo_path) { |
435 | int fd; | |
436 | ||
437 | /* If we open an unopened pipe for reading we will not | |
438 | get an EOF. to trigger an EOF we hence open it for | |
be94d954 MP |
439 | writing, but close it right away which then will |
440 | trigger the EOF. This will happen immediately if no | |
441 | other process has the FIFO open for writing, i. e. | |
442 | when the session died before logind (re)started. */ | |
b4f78aea LP |
443 | |
444 | fd = session_create_fifo(s); | |
03e334a1 | 445 | safe_close(fd); |
b4f78aea LP |
446 | } |
447 | ||
9444b1f2 LP |
448 | if (realtime) { |
449 | unsigned long long l; | |
450 | if (sscanf(realtime, "%llu", &l) > 0) | |
451 | s->timestamp.realtime = l; | |
452 | } | |
453 | ||
454 | if (monotonic) { | |
455 | unsigned long long l; | |
456 | if (sscanf(monotonic, "%llu", &l) > 0) | |
457 | s->timestamp.monotonic = l; | |
458 | } | |
a185c5aa | 459 | |
6d33772f DH |
460 | if (controller) { |
461 | if (bus_name_has_owner(s->manager->bus, controller, NULL) > 0) | |
462 | session_set_controller(s, controller, false); | |
90a18413 DH |
463 | else |
464 | session_restore_vt(s); | |
6d33772f DH |
465 | } |
466 | ||
a185c5aa | 467 | return r; |
20263082 LP |
468 | } |
469 | ||
470 | int session_activate(Session *s) { | |
d7bd01b5 DH |
471 | unsigned int num_pending; |
472 | ||
20263082 | 473 | assert(s); |
9444b1f2 | 474 | assert(s->user); |
20263082 | 475 | |
20263082 | 476 | if (!s->seat) |
15411c0c | 477 | return -EOPNOTSUPP; |
20263082 LP |
478 | |
479 | if (s->seat->active == s) | |
480 | return 0; | |
481 | ||
d7bd01b5 DH |
482 | /* on seats with VTs, we let VTs manage session-switching */ |
483 | if (seat_has_vts(s->seat)) { | |
92bd5ff3 | 484 | if (!s->vtnr) |
15411c0c | 485 | return -EOPNOTSUPP; |
d7bd01b5 DH |
486 | |
487 | return chvt(s->vtnr); | |
488 | } | |
489 | ||
490 | /* On seats without VTs, we implement session-switching in logind. We | |
491 | * try to pause all session-devices and wait until the session | |
492 | * controller acknowledged them. Once all devices are asleep, we simply | |
493 | * switch the active session and be done. | |
494 | * We save the session we want to switch to in seat->pending_switch and | |
495 | * seat_complete_switch() will perform the final switch. */ | |
496 | ||
497 | s->seat->pending_switch = s; | |
498 | ||
499 | /* if no devices are running, immediately perform the session switch */ | |
500 | num_pending = session_device_try_pause_all(s); | |
501 | if (!num_pending) | |
502 | seat_complete_switch(s->seat); | |
20263082 | 503 | |
d7bd01b5 | 504 | return 0; |
20263082 LP |
505 | } |
506 | ||
fb6becb4 | 507 | static int session_start_scope(Session *s) { |
98a28fef LP |
508 | int r; |
509 | ||
510 | assert(s); | |
9444b1f2 | 511 | assert(s->user); |
fb6becb4 | 512 | assert(s->user->slice); |
98a28fef | 513 | |
fb6becb4 | 514 | if (!s->scope) { |
cc377381 | 515 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; |
d0af76e6 | 516 | _cleanup_free_ char *description = NULL; |
39883f62 | 517 | char *scope, *job = NULL; |
d0af76e6 | 518 | |
405e0255 LP |
519 | description = strjoin("Session ", s->id, " of user ", s->user->name, NULL); |
520 | if (!description) | |
521 | return log_oom(); | |
522 | ||
d0af76e6 LP |
523 | scope = strjoin("session-", s->id, ".scope", NULL); |
524 | if (!scope) | |
ae018d9b LP |
525 | return log_oom(); |
526 | ||
646e392e | 527 | r = manager_start_scope(s->manager, scope, s->leader, s->user->slice, description, "systemd-logind.service", "systemd-user-sessions.service", &error, &job); |
d0af76e6 | 528 | if (r < 0) { |
042f5988 | 529 | log_error("Failed to start session scope %s: %s %s", |
cc377381 | 530 | scope, bus_error_message(&error, r), error.name); |
d0af76e6 | 531 | free(scope); |
f2d4f98d | 532 | return r; |
d0af76e6 LP |
533 | } else { |
534 | s->scope = scope; | |
535 | ||
536 | free(s->scope_job); | |
537 | s->scope_job = job; | |
538 | } | |
20263082 LP |
539 | } |
540 | ||
d0af76e6 LP |
541 | if (s->scope) |
542 | hashmap_put(s->manager->session_units, s->scope, s); | |
543 | ||
20263082 LP |
544 | return 0; |
545 | } | |
546 | ||
547 | int session_start(Session *s) { | |
548 | int r; | |
549 | ||
550 | assert(s); | |
9444b1f2 LP |
551 | |
552 | if (!s->user) | |
553 | return -ESTALE; | |
20263082 | 554 | |
9418f147 LP |
555 | if (s->started) |
556 | return 0; | |
557 | ||
ed18b08b LP |
558 | r = user_start(s->user); |
559 | if (r < 0) | |
560 | return r; | |
561 | ||
fb6becb4 LP |
562 | /* Create cgroup */ |
563 | r = session_start_scope(s); | |
564 | if (r < 0) | |
565 | return r; | |
566 | ||
d9eb81f9 | 567 | log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO, |
e2cc6eca | 568 | LOG_MESSAGE_ID(SD_MESSAGE_SESSION_START), |
877d54e9 LP |
569 | "SESSION_ID=%s", s->id, |
570 | "USER_ID=%s", s->user->name, | |
de0671ee | 571 | "LEADER="PID_FMT, s->leader, |
e2cc6eca | 572 | LOG_MESSAGE("New session %s of user %s.", s->id, s->user->name), |
877d54e9 | 573 | NULL); |
98a28fef | 574 | |
9444b1f2 LP |
575 | if (!dual_timestamp_is_set(&s->timestamp)) |
576 | dual_timestamp_get(&s->timestamp); | |
14c3baca | 577 | |
e9816c48 LP |
578 | if (s->seat) |
579 | seat_read_active_vt(s->seat); | |
580 | ||
9418f147 LP |
581 | s->started = true; |
582 | ||
952d3260 LP |
583 | user_elect_display(s->user); |
584 | ||
5f41d1f1 | 585 | /* Save data */ |
e9816c48 | 586 | session_save(s); |
7f7bb946 | 587 | user_save(s->user); |
5f41d1f1 LP |
588 | if (s->seat) |
589 | seat_save(s->seat); | |
e9816c48 | 590 | |
5f41d1f1 | 591 | /* Send signals */ |
da119395 | 592 | session_send_signal(s, true); |
952d3260 | 593 | user_send_changed(s->user, "Sessions", "Display", NULL); |
9418f147 LP |
594 | if (s->seat) { |
595 | if (s->seat->active == s) | |
cc377381 | 596 | seat_send_changed(s->seat, "Sessions", "ActiveSession", NULL); |
9418f147 | 597 | else |
cc377381 | 598 | seat_send_changed(s->seat, "Sessions", NULL); |
9418f147 LP |
599 | } |
600 | ||
20263082 LP |
601 | return 0; |
602 | } | |
603 | ||
9bb69af4 | 604 | static int session_stop_scope(Session *s, bool force) { |
cc377381 | 605 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; |
39883f62 | 606 | char *job = NULL; |
20263082 | 607 | int r; |
20263082 LP |
608 | |
609 | assert(s); | |
610 | ||
fb6becb4 LP |
611 | if (!s->scope) |
612 | return 0; | |
9b221b63 | 613 | |
9bb69af4 | 614 | if (force || manager_shall_kill(s->manager, s->user->name)) { |
5f41d1f1 LP |
615 | r = manager_stop_unit(s->manager, s->scope, &error, &job); |
616 | if (r < 0) { | |
617 | log_error("Failed to stop session scope: %s", bus_error_message(&error, r)); | |
618 | return r; | |
619 | } | |
20263082 | 620 | |
5f41d1f1 LP |
621 | free(s->scope_job); |
622 | s->scope_job = job; | |
623 | } else { | |
624 | r = manager_abandon_scope(s->manager, s->scope, &error); | |
625 | if (r < 0) { | |
626 | log_error("Failed to abandon session scope: %s", bus_error_message(&error, r)); | |
627 | return r; | |
628 | } | |
629 | } | |
20263082 | 630 | |
9b221b63 | 631 | return 0; |
20263082 LP |
632 | } |
633 | ||
9bb69af4 | 634 | int session_stop(Session *s, bool force) { |
405e0255 LP |
635 | int r; |
636 | ||
637 | assert(s); | |
638 | ||
639 | if (!s->user) | |
640 | return -ESTALE; | |
641 | ||
5f41d1f1 LP |
642 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
643 | ||
10189fd6 DH |
644 | if (s->seat) |
645 | seat_evict_position(s->seat, s); | |
646 | ||
5f41d1f1 LP |
647 | /* We are going down, don't care about FIFOs anymore */ |
648 | session_remove_fifo(s); | |
649 | ||
405e0255 | 650 | /* Kill cgroup */ |
9bb69af4 | 651 | r = session_stop_scope(s, force); |
405e0255 | 652 | |
5f41d1f1 LP |
653 | s->stopping = true; |
654 | ||
952d3260 LP |
655 | user_elect_display(s->user); |
656 | ||
405e0255 | 657 | session_save(s); |
cc377381 | 658 | user_save(s->user); |
405e0255 LP |
659 | |
660 | return r; | |
661 | } | |
662 | ||
663 | int session_finalize(Session *s) { | |
118ecf32 | 664 | SessionDevice *sd; |
20263082 LP |
665 | |
666 | assert(s); | |
667 | ||
9444b1f2 LP |
668 | if (!s->user) |
669 | return -ESTALE; | |
670 | ||
ed18b08b | 671 | if (s->started) |
d9eb81f9 | 672 | log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO, |
e2cc6eca | 673 | LOG_MESSAGE_ID(SD_MESSAGE_SESSION_STOP), |
877d54e9 LP |
674 | "SESSION_ID=%s", s->id, |
675 | "USER_ID=%s", s->user->name, | |
de0671ee | 676 | "LEADER="PID_FMT, s->leader, |
e2cc6eca | 677 | LOG_MESSAGE("Removed session %s.", s->id), |
877d54e9 | 678 | NULL); |
98a28fef | 679 | |
5f41d1f1 LP |
680 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
681 | ||
10189fd6 DH |
682 | if (s->seat) |
683 | seat_evict_position(s->seat, s); | |
684 | ||
118ecf32 DH |
685 | /* Kill session devices */ |
686 | while ((sd = hashmap_first(s->devices))) | |
687 | session_device_free(sd); | |
688 | ||
491ac9f2 | 689 | (void) unlink(s->state_file); |
d2f92cdf | 690 | session_add_to_gc_queue(s); |
ed18b08b | 691 | user_add_to_gc_queue(s->user); |
14c3baca | 692 | |
405e0255 | 693 | if (s->started) { |
ed18b08b | 694 | session_send_signal(s, false); |
405e0255 LP |
695 | s->started = false; |
696 | } | |
50fb9793 | 697 | |
9418f147 LP |
698 | if (s->seat) { |
699 | if (s->seat->active == s) | |
700 | seat_set_active(s->seat, NULL); | |
701 | ||
23bd3b62 | 702 | seat_save(s->seat); |
5f41d1f1 | 703 | seat_send_changed(s->seat, "Sessions", NULL); |
9418f147 LP |
704 | } |
705 | ||
23bd3b62 | 706 | user_save(s->user); |
952d3260 | 707 | user_send_changed(s->user, "Sessions", "Display", NULL); |
9418f147 | 708 | |
491ac9f2 | 709 | return 0; |
20263082 LP |
710 | } |
711 | ||
5f41d1f1 LP |
712 | static int release_timeout_callback(sd_event_source *es, uint64_t usec, void *userdata) { |
713 | Session *s = userdata; | |
714 | ||
715 | assert(es); | |
716 | assert(s); | |
717 | ||
9bb69af4 | 718 | session_stop(s, false); |
5f41d1f1 LP |
719 | return 0; |
720 | } | |
721 | ||
ad8780c9 | 722 | int session_release(Session *s) { |
5f41d1f1 LP |
723 | assert(s); |
724 | ||
725 | if (!s->started || s->stopping) | |
ad8780c9 ZJS |
726 | return 0; |
727 | ||
728 | if (s->timer_event_source) | |
729 | return 0; | |
730 | ||
731 | return sd_event_add_time(s->manager->event, | |
732 | &s->timer_event_source, | |
733 | CLOCK_MONOTONIC, | |
734 | now(CLOCK_MONOTONIC) + RELEASE_USEC, 0, | |
735 | release_timeout_callback, s); | |
5f41d1f1 LP |
736 | } |
737 | ||
20263082 LP |
738 | bool session_is_active(Session *s) { |
739 | assert(s); | |
740 | ||
741 | if (!s->seat) | |
742 | return true; | |
743 | ||
744 | return s->seat->active == s; | |
745 | } | |
746 | ||
23406ce5 LP |
747 | static int get_tty_atime(const char *tty, usec_t *atime) { |
748 | _cleanup_free_ char *p = NULL; | |
a185c5aa | 749 | struct stat st; |
23406ce5 LP |
750 | |
751 | assert(tty); | |
752 | assert(atime); | |
753 | ||
754 | if (!path_is_absolute(tty)) { | |
755 | p = strappend("/dev/", tty); | |
756 | if (!p) | |
757 | return -ENOMEM; | |
758 | ||
759 | tty = p; | |
760 | } else if (!path_startswith(tty, "/dev/")) | |
761 | return -ENOENT; | |
762 | ||
763 | if (lstat(tty, &st) < 0) | |
764 | return -errno; | |
765 | ||
766 | *atime = timespec_load(&st.st_atim); | |
767 | return 0; | |
768 | } | |
769 | ||
770 | static int get_process_ctty_atime(pid_t pid, usec_t *atime) { | |
771 | _cleanup_free_ char *p = NULL; | |
772 | int r; | |
773 | ||
774 | assert(pid > 0); | |
775 | assert(atime); | |
776 | ||
777 | r = get_ctty(pid, NULL, &p); | |
778 | if (r < 0) | |
779 | return r; | |
780 | ||
781 | return get_tty_atime(p, atime); | |
782 | } | |
783 | ||
784 | int session_get_idle_hint(Session *s, dual_timestamp *t) { | |
23406ce5 LP |
785 | usec_t atime = 0, n; |
786 | int r; | |
a185c5aa LP |
787 | |
788 | assert(s); | |
789 | ||
23406ce5 | 790 | /* Explicit idle hint is set */ |
a185c5aa LP |
791 | if (s->idle_hint) { |
792 | if (t) | |
793 | *t = s->idle_hint_timestamp; | |
794 | ||
795 | return s->idle_hint; | |
796 | } | |
797 | ||
0762eaa3 | 798 | /* Graphical sessions should really implement a real |
23406ce5 LP |
799 | * idle hint logic */ |
800 | if (s->display) | |
a185c5aa LP |
801 | goto dont_know; |
802 | ||
23406ce5 LP |
803 | /* For sessions with an explicitly configured tty, let's check |
804 | * its atime */ | |
805 | if (s->tty) { | |
806 | r = get_tty_atime(s->tty, &atime); | |
807 | if (r >= 0) | |
808 | goto found_atime; | |
809 | } | |
a185c5aa | 810 | |
23406ce5 LP |
811 | /* For sessions with a leader but no explicitly configured |
812 | * tty, let's check the controlling tty of the leader */ | |
813 | if (s->leader > 0) { | |
814 | r = get_process_ctty_atime(s->leader, &atime); | |
815 | if (r >= 0) | |
816 | goto found_atime; | |
a185c5aa LP |
817 | } |
818 | ||
a185c5aa LP |
819 | dont_know: |
820 | if (t) | |
821 | *t = s->idle_hint_timestamp; | |
822 | ||
823 | return 0; | |
23406ce5 LP |
824 | |
825 | found_atime: | |
826 | if (t) | |
827 | dual_timestamp_from_realtime(t, atime); | |
828 | ||
829 | n = now(CLOCK_REALTIME); | |
830 | ||
831 | if (s->manager->idle_action_usec <= 0) | |
832 | return 0; | |
833 | ||
834 | return atime + s->manager->idle_action_usec <= n; | |
a185c5aa LP |
835 | } |
836 | ||
bef422ae LP |
837 | void session_set_idle_hint(Session *s, bool b) { |
838 | assert(s); | |
839 | ||
840 | if (s->idle_hint == b) | |
841 | return; | |
842 | ||
843 | s->idle_hint = b; | |
844 | dual_timestamp_get(&s->idle_hint_timestamp); | |
9418f147 | 845 | |
cc377381 | 846 | session_send_changed(s, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); |
9418f147 LP |
847 | |
848 | if (s->seat) | |
cc377381 LP |
849 | seat_send_changed(s->seat, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); |
850 | ||
851 | user_send_changed(s->user, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); | |
852 | manager_send_changed(s->manager, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); | |
853 | } | |
854 | ||
855 | static int session_dispatch_fifo(sd_event_source *es, int fd, uint32_t revents, void *userdata) { | |
856 | Session *s = userdata; | |
857 | ||
858 | assert(s); | |
859 | assert(s->fifo_fd == fd); | |
860 | ||
861 | /* EOF on the FIFO means the session died abnormally. */ | |
862 | ||
863 | session_remove_fifo(s); | |
9bb69af4 | 864 | session_stop(s, false); |
cc377381 LP |
865 | |
866 | return 1; | |
bef422ae LP |
867 | } |
868 | ||
932e3ee7 LP |
869 | int session_create_fifo(Session *s) { |
870 | int r; | |
871 | ||
31b79c2b LP |
872 | assert(s); |
873 | ||
b4f78aea | 874 | /* Create FIFO */ |
932e3ee7 | 875 | if (!s->fifo_path) { |
d2e54fae | 876 | r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0); |
e6061ab2 LP |
877 | if (r < 0) |
878 | return r; | |
879 | ||
932e3ee7 LP |
880 | if (asprintf(&s->fifo_path, "/run/systemd/sessions/%s.ref", s->id) < 0) |
881 | return -ENOMEM; | |
31b79c2b | 882 | |
932e3ee7 LP |
883 | if (mkfifo(s->fifo_path, 0600) < 0 && errno != EEXIST) |
884 | return -errno; | |
885 | } | |
31b79c2b | 886 | |
932e3ee7 | 887 | /* Open reading side */ |
b4f78aea | 888 | if (s->fifo_fd < 0) { |
b4f78aea LP |
889 | s->fifo_fd = open(s->fifo_path, O_RDONLY|O_CLOEXEC|O_NDELAY); |
890 | if (s->fifo_fd < 0) | |
891 | return -errno; | |
892 | ||
cc377381 LP |
893 | } |
894 | ||
895 | if (!s->fifo_event_source) { | |
151b9b96 | 896 | r = sd_event_add_io(s->manager->event, &s->fifo_event_source, s->fifo_fd, 0, session_dispatch_fifo, s); |
b4f78aea LP |
897 | if (r < 0) |
898 | return r; | |
899 | ||
718db961 | 900 | r = sd_event_source_set_priority(s->fifo_event_source, SD_EVENT_PRIORITY_IDLE); |
cc377381 LP |
901 | if (r < 0) |
902 | return r; | |
b4f78aea | 903 | } |
932e3ee7 LP |
904 | |
905 | /* Open writing side */ | |
906 | r = open(s->fifo_path, O_WRONLY|O_CLOEXEC|O_NDELAY); | |
907 | if (r < 0) | |
908 | return -errno; | |
31b79c2b | 909 | |
932e3ee7 LP |
910 | return r; |
911 | } | |
912 | ||
5f41d1f1 | 913 | static void session_remove_fifo(Session *s) { |
932e3ee7 LP |
914 | assert(s); |
915 | ||
03e334a1 LP |
916 | s->fifo_event_source = sd_event_source_unref(s->fifo_event_source); |
917 | s->fifo_fd = safe_close(s->fifo_fd); | |
932e3ee7 LP |
918 | |
919 | if (s->fifo_path) { | |
920 | unlink(s->fifo_path); | |
a1e58e8e | 921 | s->fifo_path = mfree(s->fifo_path); |
932e3ee7 | 922 | } |
31b79c2b LP |
923 | } |
924 | ||
cc377381 | 925 | bool session_check_gc(Session *s, bool drop_not_started) { |
20263082 LP |
926 | assert(s); |
927 | ||
4a4b033f | 928 | if (drop_not_started && !s->started) |
cc377381 | 929 | return false; |
932e3ee7 | 930 | |
9444b1f2 | 931 | if (!s->user) |
cc377381 | 932 | return false; |
9444b1f2 | 933 | |
932e3ee7 | 934 | if (s->fifo_fd >= 0) { |
5f41d1f1 | 935 | if (pipe_eof(s->fifo_fd) <= 0) |
cc377381 | 936 | return true; |
20263082 LP |
937 | } |
938 | ||
cc377381 LP |
939 | if (s->scope_job && manager_job_is_active(s->manager, s->scope_job)) |
940 | return true; | |
20263082 | 941 | |
cc377381 LP |
942 | if (s->scope && manager_unit_is_active(s->manager, s->scope)) |
943 | return true; | |
20263082 | 944 | |
cc377381 | 945 | return false; |
20263082 LP |
946 | } |
947 | ||
14c3baca LP |
948 | void session_add_to_gc_queue(Session *s) { |
949 | assert(s); | |
950 | ||
951 | if (s->in_gc_queue) | |
952 | return; | |
953 | ||
71fda00f | 954 | LIST_PREPEND(gc_queue, s->manager->session_gc_queue, s); |
14c3baca LP |
955 | s->in_gc_queue = true; |
956 | } | |
957 | ||
0604381b LP |
958 | SessionState session_get_state(Session *s) { |
959 | assert(s); | |
960 | ||
8fe63cd4 | 961 | /* always check closing first */ |
5f41d1f1 LP |
962 | if (s->stopping || s->timer_event_source) |
963 | return SESSION_CLOSING; | |
964 | ||
8fe63cd4 | 965 | if (s->scope_job || s->fifo_fd < 0) |
405e0255 | 966 | return SESSION_OPENING; |
fb6becb4 | 967 | |
0604381b LP |
968 | if (session_is_active(s)) |
969 | return SESSION_ACTIVE; | |
970 | ||
971 | return SESSION_ONLINE; | |
972 | } | |
973 | ||
de07ab16 | 974 | int session_kill(Session *s, KillWho who, int signo) { |
de07ab16 LP |
975 | assert(s); |
976 | ||
fb6becb4 | 977 | if (!s->scope) |
de07ab16 LP |
978 | return -ESRCH; |
979 | ||
fb6becb4 | 980 | return manager_kill_unit(s->manager, s->scope, who, signo, NULL); |
de07ab16 LP |
981 | } |
982 | ||
90a18413 | 983 | static int session_open_vt(Session *s) { |
5f41d1f1 | 984 | char path[sizeof("/dev/tty") + DECIMAL_STR_MAX(s->vtnr)]; |
90a18413 | 985 | |
baccf3e4 OB |
986 | if (s->vtnr < 1) |
987 | return -ENODEV; | |
90a18413 DH |
988 | |
989 | if (s->vtfd >= 0) | |
990 | return s->vtfd; | |
991 | ||
92bd5ff3 | 992 | sprintf(path, "/dev/tty%u", s->vtnr); |
22356953 | 993 | s->vtfd = open_terminal(path, O_RDWR | O_CLOEXEC | O_NONBLOCK | O_NOCTTY); |
4a62c710 MS |
994 | if (s->vtfd < 0) |
995 | return log_error_errno(errno, "cannot open VT %s of session %s: %m", path, s->id); | |
90a18413 DH |
996 | |
997 | return s->vtfd; | |
998 | } | |
999 | ||
baccf3e4 | 1000 | int session_prepare_vt(Session *s) { |
90a18413 DH |
1001 | int vt, r; |
1002 | struct vt_mode mode = { 0 }; | |
90a18413 | 1003 | |
baccf3e4 OB |
1004 | if (s->vtnr < 1) |
1005 | return 0; | |
1006 | ||
90a18413 DH |
1007 | vt = session_open_vt(s); |
1008 | if (vt < 0) | |
baccf3e4 | 1009 | return vt; |
90a18413 | 1010 | |
d6176c6c | 1011 | r = fchown(vt, s->user->uid, -1); |
baccf3e4 | 1012 | if (r < 0) { |
94c156cd LP |
1013 | r = log_error_errno(errno, |
1014 | "Cannot change owner of /dev/tty%u: %m", | |
1015 | s->vtnr); | |
d6176c6c | 1016 | goto error; |
baccf3e4 | 1017 | } |
d6176c6c | 1018 | |
90a18413 | 1019 | r = ioctl(vt, KDSKBMODE, K_OFF); |
baccf3e4 | 1020 | if (r < 0) { |
94c156cd LP |
1021 | r = log_error_errno(errno, |
1022 | "Cannot set K_OFF on /dev/tty%u: %m", | |
1023 | s->vtnr); | |
90a18413 | 1024 | goto error; |
baccf3e4 | 1025 | } |
90a18413 DH |
1026 | |
1027 | r = ioctl(vt, KDSETMODE, KD_GRAPHICS); | |
baccf3e4 | 1028 | if (r < 0) { |
94c156cd LP |
1029 | r = log_error_errno(errno, |
1030 | "Cannot set KD_GRAPHICS on /dev/tty%u: %m", | |
1031 | s->vtnr); | |
90a18413 | 1032 | goto error; |
baccf3e4 | 1033 | } |
90a18413 | 1034 | |
90a18413 DH |
1035 | /* Oh, thanks to the VT layer, VT_AUTO does not work with KD_GRAPHICS. |
1036 | * So we need a dummy handler here which just acknowledges *all* VT | |
1037 | * switch requests. */ | |
1038 | mode.mode = VT_PROCESS; | |
92683ad2 DH |
1039 | mode.relsig = SIGRTMIN; |
1040 | mode.acqsig = SIGRTMIN + 1; | |
90a18413 | 1041 | r = ioctl(vt, VT_SETMODE, &mode); |
baccf3e4 | 1042 | if (r < 0) { |
94c156cd LP |
1043 | r = log_error_errno(errno, |
1044 | "Cannot set VT_PROCESS on /dev/tty%u: %m", | |
1045 | s->vtnr); | |
90a18413 | 1046 | goto error; |
baccf3e4 | 1047 | } |
90a18413 | 1048 | |
baccf3e4 | 1049 | return 0; |
90a18413 DH |
1050 | |
1051 | error: | |
90a18413 | 1052 | session_restore_vt(s); |
baccf3e4 | 1053 | return r; |
90a18413 DH |
1054 | } |
1055 | ||
1056 | void session_restore_vt(Session *s) { | |
16597ac3 LP |
1057 | |
1058 | static const struct vt_mode mode = { | |
1059 | .mode = VT_AUTO, | |
1060 | }; | |
1061 | ||
a0eb2a75 | 1062 | _cleanup_free_ char *utf8 = NULL; |
16597ac3 | 1063 | int vt, kb, old_fd; |
90a18413 | 1064 | |
128df4cf OT |
1065 | /* We need to get a fresh handle to the virtual terminal, |
1066 | * since the old file-descriptor is potentially in a hung-up | |
1067 | * state after the controlling process exited; we do a | |
1068 | * little dance to avoid having the terminal be available | |
1069 | * for reuse before we've cleaned it up. | |
1070 | */ | |
16597ac3 | 1071 | old_fd = s->vtfd; |
128df4cf OT |
1072 | s->vtfd = -1; |
1073 | ||
90a18413 | 1074 | vt = session_open_vt(s); |
128df4cf OT |
1075 | safe_close(old_fd); |
1076 | ||
90a18413 DH |
1077 | if (vt < 0) |
1078 | return; | |
1079 | ||
2bf10523 | 1080 | (void) ioctl(vt, KDSETMODE, KD_TEXT); |
90a18413 DH |
1081 | |
1082 | if (read_one_line_file("/sys/module/vt/parameters/default_utf8", &utf8) >= 0 && *utf8 == '1') | |
1083 | kb = K_UNICODE; | |
16597ac3 LP |
1084 | else |
1085 | kb = K_XLATE; | |
03e334a1 | 1086 | |
2bf10523 | 1087 | (void) ioctl(vt, KDSKBMODE, kb); |
90a18413 | 1088 | |
2bf10523 | 1089 | (void) ioctl(vt, VT_SETMODE, &mode); |
16597ac3 | 1090 | (void) fchown(vt, 0, (gid_t) -1); |
d6176c6c | 1091 | |
03e334a1 | 1092 | s->vtfd = safe_close(s->vtfd); |
90a18413 DH |
1093 | } |
1094 | ||
2ec3ff66 | 1095 | void session_leave_vt(Session *s) { |
ce540a24 DH |
1096 | int r; |
1097 | ||
2ec3ff66 DH |
1098 | assert(s); |
1099 | ||
1100 | /* This is called whenever we get a VT-switch signal from the kernel. | |
1101 | * We acknowledge all of them unconditionally. Note that session are | |
1102 | * free to overwrite those handlers and we only register them for | |
1103 | * sessions with controllers. Legacy sessions are not affected. | |
1104 | * However, if we switch from a non-legacy to a legacy session, we must | |
1105 | * make sure to pause all device before acknowledging the switch. We | |
1106 | * process the real switch only after we are notified via sysfs, so the | |
1107 | * legacy session might have already started using the devices. If we | |
1108 | * don't pause the devices before the switch, we might confuse the | |
1109 | * session we switch to. */ | |
1110 | ||
1111 | if (s->vtfd < 0) | |
1112 | return; | |
1113 | ||
1114 | session_device_pause_all(s); | |
ce540a24 DH |
1115 | r = ioctl(s->vtfd, VT_RELDISP, 1); |
1116 | if (r < 0) | |
56f64d95 | 1117 | log_debug_errno(errno, "Cannot release VT of session %s: %m", s->id); |
2ec3ff66 DH |
1118 | } |
1119 | ||
cc377381 | 1120 | bool session_is_controller(Session *s, const char *sender) { |
ae5e06bd DH |
1121 | assert(s); |
1122 | ||
1123 | return streq_ptr(s->controller, sender); | |
1124 | } | |
1125 | ||
b12e5615 DH |
1126 | static void session_release_controller(Session *s, bool notify) { |
1127 | _cleanup_free_ char *name = NULL; | |
6d33772f DH |
1128 | SessionDevice *sd; |
1129 | ||
b12e5615 DH |
1130 | if (!s->controller) |
1131 | return; | |
6d33772f | 1132 | |
b12e5615 | 1133 | name = s->controller; |
90a18413 | 1134 | |
b12e5615 DH |
1135 | /* By resetting the controller before releasing the devices, we won't |
1136 | * send notification signals. This avoids sending useless notifications | |
1137 | * if the controller is released on disconnects. */ | |
1138 | if (!notify) | |
1139 | s->controller = NULL; | |
6d33772f | 1140 | |
b12e5615 DH |
1141 | while ((sd = hashmap_first(s->devices))) |
1142 | session_device_free(sd); | |
1143 | ||
1144 | s->controller = NULL; | |
3cde9e8f DM |
1145 | s->track = sd_bus_track_unref(s->track); |
1146 | } | |
1147 | ||
1148 | static int on_bus_track(sd_bus_track *track, void *userdata) { | |
1149 | Session *s = userdata; | |
1150 | ||
1151 | assert(track); | |
1152 | assert(s); | |
1153 | ||
1154 | session_drop_controller(s); | |
1155 | ||
1156 | return 0; | |
6d33772f DH |
1157 | } |
1158 | ||
ae5e06bd | 1159 | int session_set_controller(Session *s, const char *sender, bool force) { |
b12e5615 | 1160 | _cleanup_free_ char *name = NULL; |
ae5e06bd DH |
1161 | int r; |
1162 | ||
1163 | assert(s); | |
1164 | assert(sender); | |
1165 | ||
1166 | if (session_is_controller(s, sender)) | |
1167 | return 0; | |
1168 | if (s->controller && !force) | |
1169 | return -EBUSY; | |
1170 | ||
b12e5615 DH |
1171 | name = strdup(sender); |
1172 | if (!name) | |
ae5e06bd DH |
1173 | return -ENOMEM; |
1174 | ||
3cde9e8f DM |
1175 | s->track = sd_bus_track_unref(s->track); |
1176 | r = sd_bus_track_new(s->manager->bus, &s->track, on_bus_track, s); | |
1177 | if (r < 0) | |
1178 | return r; | |
1179 | ||
1180 | r = sd_bus_track_add_name(s->track, name); | |
1181 | if (r < 0) | |
ae5e06bd | 1182 | return r; |
ae5e06bd | 1183 | |
90a18413 DH |
1184 | /* When setting a session controller, we forcibly mute the VT and set |
1185 | * it into graphics-mode. Applications can override that by changing | |
1186 | * VT state after calling TakeControl(). However, this serves as a good | |
1187 | * default and well-behaving controllers can now ignore VTs entirely. | |
1188 | * Note that we reset the VT on ReleaseControl() and if the controller | |
1189 | * exits. | |
1190 | * If logind crashes/restarts, we restore the controller during restart | |
1191 | * or reset the VT in case it crashed/exited, too. */ | |
baccf3e4 | 1192 | r = session_prepare_vt(s); |
13f493dc | 1193 | if (r < 0) { |
3cde9e8f | 1194 | s->track = sd_bus_track_unref(s->track); |
baccf3e4 | 1195 | return r; |
13f493dc | 1196 | } |
baccf3e4 | 1197 | |
b12e5615 DH |
1198 | session_release_controller(s, true); |
1199 | s->controller = name; | |
1200 | name = NULL; | |
1201 | session_save(s); | |
90a18413 | 1202 | |
ae5e06bd DH |
1203 | return 0; |
1204 | } | |
1205 | ||
1206 | void session_drop_controller(Session *s) { | |
1207 | assert(s); | |
1208 | ||
1209 | if (!s->controller) | |
1210 | return; | |
1211 | ||
3cde9e8f | 1212 | s->track = sd_bus_track_unref(s->track); |
b12e5615 DH |
1213 | session_release_controller(s, false); |
1214 | session_save(s); | |
1215 | session_restore_vt(s); | |
ae5e06bd DH |
1216 | } |
1217 | ||
fb6becb4 LP |
1218 | static const char* const session_state_table[_SESSION_STATE_MAX] = { |
1219 | [SESSION_OPENING] = "opening", | |
0604381b LP |
1220 | [SESSION_ONLINE] = "online", |
1221 | [SESSION_ACTIVE] = "active", | |
1222 | [SESSION_CLOSING] = "closing" | |
1223 | }; | |
1224 | ||
1225 | DEFINE_STRING_TABLE_LOOKUP(session_state, SessionState); | |
1226 | ||
20263082 | 1227 | static const char* const session_type_table[_SESSION_TYPE_MAX] = { |
2c5859af | 1228 | [SESSION_UNSPECIFIED] = "unspecified", |
3f49d45a | 1229 | [SESSION_TTY] = "tty", |
98a28fef | 1230 | [SESSION_X11] = "x11", |
d9eb81f9 | 1231 | [SESSION_WAYLAND] = "wayland", |
9541666b | 1232 | [SESSION_MIR] = "mir", |
e9e74f28 | 1233 | [SESSION_WEB] = "web", |
20263082 LP |
1234 | }; |
1235 | ||
1236 | DEFINE_STRING_TABLE_LOOKUP(session_type, SessionType); | |
de07ab16 | 1237 | |
55efac6c LP |
1238 | static const char* const session_class_table[_SESSION_CLASS_MAX] = { |
1239 | [SESSION_USER] = "user", | |
1240 | [SESSION_GREETER] = "greeter", | |
e2acb67b LP |
1241 | [SESSION_LOCK_SCREEN] = "lock-screen", |
1242 | [SESSION_BACKGROUND] = "background" | |
55efac6c LP |
1243 | }; |
1244 | ||
1245 | DEFINE_STRING_TABLE_LOOKUP(session_class, SessionClass); | |
1246 | ||
de07ab16 LP |
1247 | static const char* const kill_who_table[_KILL_WHO_MAX] = { |
1248 | [KILL_LEADER] = "leader", | |
1249 | [KILL_ALL] = "all" | |
1250 | }; | |
1251 | ||
1252 | DEFINE_STRING_TABLE_LOOKUP(kill_who, KillWho); |