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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 | 43 | #include "mkdir.h" |
6bedfcbb | 44 | #include "parse-util.h" |
4f5dd394 | 45 | #include "path-util.h" |
288a74cc | 46 | #include "terminal-util.h" |
b1d4f8e1 | 47 | #include "user-util.h" |
4f5dd394 | 48 | #include "util.h" |
20263082 | 49 | |
5f41d1f1 LP |
50 | #define RELEASE_USEC (20*USEC_PER_SEC) |
51 | ||
52 | static void session_remove_fifo(Session *s); | |
53 | ||
9444b1f2 | 54 | Session* session_new(Manager *m, const char *id) { |
20263082 LP |
55 | Session *s; |
56 | ||
57 | assert(m); | |
58 | assert(id); | |
4b549144 | 59 | assert(session_id_valid(id)); |
20263082 | 60 | |
14c3baca | 61 | s = new0(Session, 1); |
20263082 LP |
62 | if (!s) |
63 | return NULL; | |
64 | ||
98a28fef | 65 | s->state_file = strappend("/run/systemd/sessions/", id); |
20263082 LP |
66 | if (!s->state_file) { |
67 | free(s); | |
68 | return NULL; | |
69 | } | |
70 | ||
d5099efc | 71 | s->devices = hashmap_new(&devt_hash_ops); |
118ecf32 DH |
72 | if (!s->devices) { |
73 | free(s->state_file); | |
74 | free(s); | |
75 | return NULL; | |
76 | } | |
77 | ||
2b6bf07d | 78 | s->id = basename(s->state_file); |
20263082 LP |
79 | |
80 | if (hashmap_put(m->sessions, s->id, s) < 0) { | |
118ecf32 | 81 | hashmap_free(s->devices); |
f8e2fb7b | 82 | free(s->state_file); |
20263082 LP |
83 | free(s); |
84 | return NULL; | |
85 | } | |
86 | ||
87 | s->manager = m; | |
932e3ee7 | 88 | s->fifo_fd = -1; |
90a18413 | 89 | s->vtfd = -1; |
20263082 LP |
90 | |
91 | return s; | |
92 | } | |
93 | ||
94 | void session_free(Session *s) { | |
118ecf32 DH |
95 | SessionDevice *sd; |
96 | ||
20263082 LP |
97 | assert(s); |
98 | ||
14c3baca | 99 | if (s->in_gc_queue) |
71fda00f | 100 | LIST_REMOVE(gc_queue, s->manager->session_gc_queue, s); |
14c3baca | 101 | |
5f41d1f1 LP |
102 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
103 | ||
cc377381 LP |
104 | session_remove_fifo(s); |
105 | ||
ae5e06bd DH |
106 | session_drop_controller(s); |
107 | ||
118ecf32 DH |
108 | while ((sd = hashmap_first(s->devices))) |
109 | session_device_free(sd); | |
110 | ||
111 | hashmap_free(s->devices); | |
112 | ||
20263082 | 113 | if (s->user) { |
71fda00f | 114 | LIST_REMOVE(sessions_by_user, s->user->sessions, s); |
20263082 LP |
115 | |
116 | if (s->user->display == s) | |
117 | s->user->display = NULL; | |
118 | } | |
119 | ||
9418f147 LP |
120 | if (s->seat) { |
121 | if (s->seat->active == s) | |
122 | s->seat->active = NULL; | |
d7bd01b5 DH |
123 | if (s->seat->pending_switch == s) |
124 | s->seat->pending_switch = NULL; | |
9418f147 | 125 | |
49e6fdbf | 126 | seat_evict_position(s->seat, s); |
71fda00f | 127 | LIST_REMOVE(sessions_by_seat, s->seat->sessions, s); |
9418f147 | 128 | } |
20263082 | 129 | |
fb6becb4 LP |
130 | if (s->scope) { |
131 | hashmap_remove(s->manager->session_units, s->scope); | |
132 | free(s->scope); | |
133 | } | |
134 | ||
135 | free(s->scope_job); | |
1713813d | 136 | |
cc377381 | 137 | sd_bus_message_unref(s->create_message); |
20263082 LP |
138 | |
139 | free(s->tty); | |
140 | free(s->display); | |
141 | free(s->remote_host); | |
3f49d45a | 142 | free(s->remote_user); |
98a28fef | 143 | free(s->service); |
a4cd87e9 | 144 | free(s->desktop); |
20263082 LP |
145 | |
146 | hashmap_remove(s->manager->sessions, s->id); | |
98a28fef | 147 | |
d2f92cdf | 148 | free(s->state_file); |
20263082 LP |
149 | free(s); |
150 | } | |
151 | ||
9444b1f2 LP |
152 | void session_set_user(Session *s, User *u) { |
153 | assert(s); | |
154 | assert(!s->user); | |
155 | ||
156 | s->user = u; | |
71fda00f | 157 | LIST_PREPEND(sessions_by_user, u->sessions, s); |
9444b1f2 LP |
158 | } |
159 | ||
20263082 | 160 | int session_save(Session *s) { |
507f22bd | 161 | _cleanup_free_ char *temp_path = NULL; |
cc377381 | 162 | _cleanup_fclose_ FILE *f = NULL; |
20263082 LP |
163 | int r = 0; |
164 | ||
165 | assert(s); | |
166 | ||
9444b1f2 LP |
167 | if (!s->user) |
168 | return -ESTALE; | |
169 | ||
accaeded LP |
170 | if (!s->started) |
171 | return 0; | |
172 | ||
d2e54fae | 173 | r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0); |
20263082 | 174 | if (r < 0) |
dacd6cee | 175 | goto fail; |
20263082 | 176 | |
14c3baca LP |
177 | r = fopen_temporary(s->state_file, &f, &temp_path); |
178 | if (r < 0) | |
dacd6cee | 179 | goto fail; |
20263082 LP |
180 | |
181 | assert(s->user); | |
182 | ||
14c3baca LP |
183 | fchmod(fileno(f), 0644); |
184 | ||
20263082 LP |
185 | fprintf(f, |
186 | "# This is private data. Do not parse.\n" | |
90b2de37 | 187 | "UID="UID_FMT"\n" |
20263082 LP |
188 | "USER=%s\n" |
189 | "ACTIVE=%i\n" | |
0604381b | 190 | "STATE=%s\n" |
fb6becb4 | 191 | "REMOTE=%i\n", |
90b2de37 | 192 | s->user->uid, |
20263082 LP |
193 | s->user->name, |
194 | session_is_active(s), | |
0604381b | 195 | session_state_to_string(session_get_state(s)), |
fb6becb4 | 196 | s->remote); |
20263082 | 197 | |
a91e4e53 | 198 | if (s->type >= 0) |
507f22bd | 199 | fprintf(f, "TYPE=%s\n", session_type_to_string(s->type)); |
a91e4e53 | 200 | |
55efac6c | 201 | if (s->class >= 0) |
507f22bd | 202 | fprintf(f, "CLASS=%s\n", session_class_to_string(s->class)); |
55efac6c | 203 | |
fb6becb4 LP |
204 | if (s->scope) |
205 | fprintf(f, "SCOPE=%s\n", s->scope); | |
fb6becb4 LP |
206 | if (s->scope_job) |
207 | fprintf(f, "SCOPE_JOB=%s\n", s->scope_job); | |
20263082 | 208 | |
932e3ee7 | 209 | if (s->fifo_path) |
507f22bd | 210 | fprintf(f, "FIFO=%s\n", s->fifo_path); |
932e3ee7 | 211 | |
20263082 | 212 | if (s->seat) |
507f22bd | 213 | fprintf(f, "SEAT=%s\n", s->seat->id); |
20263082 LP |
214 | |
215 | if (s->tty) | |
507f22bd | 216 | fprintf(f, "TTY=%s\n", s->tty); |
20263082 LP |
217 | |
218 | if (s->display) | |
507f22bd | 219 | fprintf(f, "DISPLAY=%s\n", s->display); |
20263082 | 220 | |
558c6490 LP |
221 | if (s->remote_host) { |
222 | _cleanup_free_ char *escaped; | |
223 | ||
224 | escaped = cescape(s->remote_host); | |
225 | if (!escaped) { | |
226 | r = -ENOMEM; | |
dacd6cee | 227 | goto fail; |
558c6490 LP |
228 | } |
229 | ||
230 | fprintf(f, "REMOTE_HOST=%s\n", escaped); | |
231 | } | |
232 | ||
233 | if (s->remote_user) { | |
234 | _cleanup_free_ char *escaped; | |
235 | ||
236 | escaped = cescape(s->remote_user); | |
237 | if (!escaped) { | |
238 | r = -ENOMEM; | |
dacd6cee | 239 | goto fail; |
558c6490 LP |
240 | } |
241 | ||
242 | fprintf(f, "REMOTE_USER=%s\n", escaped); | |
243 | } | |
244 | ||
245 | if (s->service) { | |
246 | _cleanup_free_ char *escaped; | |
20263082 | 247 | |
558c6490 LP |
248 | escaped = cescape(s->service); |
249 | if (!escaped) { | |
250 | r = -ENOMEM; | |
dacd6cee | 251 | goto fail; |
558c6490 LP |
252 | } |
253 | ||
254 | fprintf(f, "SERVICE=%s\n", escaped); | |
255 | } | |
3f49d45a | 256 | |
558c6490 LP |
257 | if (s->desktop) { |
258 | _cleanup_free_ char *escaped; | |
98a28fef | 259 | |
558c6490 LP |
260 | |
261 | escaped = cescape(s->desktop); | |
262 | if (!escaped) { | |
263 | r = -ENOMEM; | |
dacd6cee | 264 | goto fail; |
558c6490 LP |
265 | } |
266 | ||
267 | fprintf(f, "DESKTOP=%s\n", escaped); | |
268 | } | |
a4cd87e9 | 269 | |
bf7825ae | 270 | if (s->seat && seat_has_vts(s->seat)) |
92bd5ff3 | 271 | fprintf(f, "VTNR=%u\n", s->vtnr); |
20263082 | 272 | |
49e6fdbf | 273 | if (!s->vtnr) |
e6494a07 | 274 | fprintf(f, "POSITION=%u\n", s->position); |
49e6fdbf | 275 | |
20263082 | 276 | if (s->leader > 0) |
90b2de37 | 277 | fprintf(f, "LEADER="PID_FMT"\n", s->leader); |
20263082 LP |
278 | |
279 | if (s->audit_id > 0) | |
507f22bd | 280 | fprintf(f, "AUDIT=%"PRIu32"\n", s->audit_id); |
20263082 | 281 | |
9444b1f2 LP |
282 | if (dual_timestamp_is_set(&s->timestamp)) |
283 | fprintf(f, | |
90b2de37 ZJS |
284 | "REALTIME="USEC_FMT"\n" |
285 | "MONOTONIC="USEC_FMT"\n", | |
286 | s->timestamp.realtime, | |
287 | s->timestamp.monotonic); | |
9444b1f2 | 288 | |
6d33772f DH |
289 | if (s->controller) |
290 | fprintf(f, "CONTROLLER=%s\n", s->controller); | |
291 | ||
dacd6cee LP |
292 | r = fflush_and_check(f); |
293 | if (r < 0) | |
294 | goto fail; | |
14c3baca | 295 | |
dacd6cee | 296 | if (rename(temp_path, s->state_file) < 0) { |
20263082 | 297 | r = -errno; |
dacd6cee | 298 | goto fail; |
20263082 LP |
299 | } |
300 | ||
dacd6cee LP |
301 | return 0; |
302 | ||
303 | fail: | |
304 | (void) unlink(s->state_file); | |
14c3baca | 305 | |
dacd6cee LP |
306 | if (temp_path) |
307 | (void) unlink(temp_path); | |
308 | ||
309 | return log_error_errno(r, "Failed to save session data %s: %m", s->state_file); | |
20263082 LP |
310 | } |
311 | ||
dacd6cee | 312 | |
20263082 | 313 | int session_load(Session *s) { |
9444b1f2 | 314 | _cleanup_free_ char *remote = NULL, |
a185c5aa LP |
315 | *seat = NULL, |
316 | *vtnr = NULL, | |
be94d954 | 317 | *state = NULL, |
e6494a07 | 318 | *position = NULL, |
a185c5aa | 319 | *leader = NULL, |
55efac6c | 320 | *type = NULL, |
9444b1f2 LP |
321 | *class = NULL, |
322 | *uid = NULL, | |
323 | *realtime = NULL, | |
6d33772f DH |
324 | *monotonic = NULL, |
325 | *controller = NULL; | |
a185c5aa LP |
326 | |
327 | int k, r; | |
328 | ||
20263082 LP |
329 | assert(s); |
330 | ||
a185c5aa LP |
331 | r = parse_env_file(s->state_file, NEWLINE, |
332 | "REMOTE", &remote, | |
fb6becb4 LP |
333 | "SCOPE", &s->scope, |
334 | "SCOPE_JOB", &s->scope_job, | |
932e3ee7 | 335 | "FIFO", &s->fifo_path, |
a185c5aa LP |
336 | "SEAT", &seat, |
337 | "TTY", &s->tty, | |
338 | "DISPLAY", &s->display, | |
339 | "REMOTE_HOST", &s->remote_host, | |
340 | "REMOTE_USER", &s->remote_user, | |
98a28fef | 341 | "SERVICE", &s->service, |
a4cd87e9 | 342 | "DESKTOP", &s->desktop, |
a185c5aa | 343 | "VTNR", &vtnr, |
be94d954 | 344 | "STATE", &state, |
e6494a07 | 345 | "POSITION", &position, |
a185c5aa | 346 | "LEADER", &leader, |
a91e4e53 | 347 | "TYPE", &type, |
55efac6c | 348 | "CLASS", &class, |
9444b1f2 LP |
349 | "UID", &uid, |
350 | "REALTIME", &realtime, | |
351 | "MONOTONIC", &monotonic, | |
6d33772f | 352 | "CONTROLLER", &controller, |
a185c5aa LP |
353 | NULL); |
354 | ||
f647962d MS |
355 | if (r < 0) |
356 | return log_error_errno(r, "Failed to read %s: %m", s->state_file); | |
9444b1f2 LP |
357 | |
358 | if (!s->user) { | |
359 | uid_t u; | |
360 | User *user; | |
361 | ||
362 | if (!uid) { | |
363 | log_error("UID not specified for session %s", s->id); | |
364 | return -ENOENT; | |
365 | } | |
366 | ||
367 | r = parse_uid(uid, &u); | |
368 | if (r < 0) { | |
369 | log_error("Failed to parse UID value %s for session %s.", uid, s->id); | |
370 | return r; | |
371 | } | |
372 | ||
8cb4ab00 | 373 | user = hashmap_get(s->manager->users, UID_TO_PTR(u)); |
9444b1f2 LP |
374 | if (!user) { |
375 | log_error("User of session %s not known.", s->id); | |
376 | return -ENOENT; | |
377 | } | |
378 | ||
379 | session_set_user(s, user); | |
380 | } | |
a185c5aa LP |
381 | |
382 | if (remote) { | |
383 | k = parse_boolean(remote); | |
384 | if (k >= 0) | |
385 | s->remote = k; | |
386 | } | |
387 | ||
c506027a DH |
388 | if (vtnr) |
389 | safe_atou(vtnr, &s->vtnr); | |
390 | ||
9418f147 | 391 | if (seat && !s->seat) { |
a185c5aa LP |
392 | Seat *o; |
393 | ||
394 | o = hashmap_get(s->manager->seats, seat); | |
395 | if (o) | |
c506027a DH |
396 | r = seat_attach_session(o, s); |
397 | if (!o || r < 0) | |
398 | log_error("Cannot attach session %s to seat %s", s->id, seat); | |
a185c5aa LP |
399 | } |
400 | ||
c506027a DH |
401 | if (!s->seat || !seat_has_vts(s->seat)) |
402 | s->vtnr = 0; | |
a185c5aa | 403 | |
e6494a07 | 404 | if (position && s->seat) { |
49e6fdbf DH |
405 | unsigned int npos; |
406 | ||
e6494a07 | 407 | safe_atou(position, &npos); |
49e6fdbf DH |
408 | seat_claim_position(s->seat, s, npos); |
409 | } | |
410 | ||
a185c5aa | 411 | if (leader) { |
f8e2fb7b LP |
412 | k = parse_pid(leader, &s->leader); |
413 | if (k >= 0) | |
414 | audit_session_from_pid(s->leader, &s->audit_id); | |
a185c5aa LP |
415 | } |
416 | ||
a91e4e53 LP |
417 | if (type) { |
418 | SessionType t; | |
419 | ||
420 | t = session_type_from_string(type); | |
421 | if (t >= 0) | |
422 | s->type = t; | |
423 | } | |
424 | ||
55efac6c LP |
425 | if (class) { |
426 | SessionClass c; | |
427 | ||
428 | c = session_class_from_string(class); | |
429 | if (c >= 0) | |
430 | s->class = c; | |
431 | } | |
432 | ||
be94d954 MP |
433 | if (state && streq(state, "closing")) |
434 | s->stopping = true; | |
435 | ||
b4f78aea LP |
436 | if (s->fifo_path) { |
437 | int fd; | |
438 | ||
439 | /* If we open an unopened pipe for reading we will not | |
440 | get an EOF. to trigger an EOF we hence open it for | |
be94d954 MP |
441 | writing, but close it right away which then will |
442 | trigger the EOF. This will happen immediately if no | |
443 | other process has the FIFO open for writing, i. e. | |
444 | when the session died before logind (re)started. */ | |
b4f78aea LP |
445 | |
446 | fd = session_create_fifo(s); | |
03e334a1 | 447 | safe_close(fd); |
b4f78aea LP |
448 | } |
449 | ||
9444b1f2 LP |
450 | if (realtime) { |
451 | unsigned long long l; | |
452 | if (sscanf(realtime, "%llu", &l) > 0) | |
453 | s->timestamp.realtime = l; | |
454 | } | |
455 | ||
456 | if (monotonic) { | |
457 | unsigned long long l; | |
458 | if (sscanf(monotonic, "%llu", &l) > 0) | |
459 | s->timestamp.monotonic = l; | |
460 | } | |
a185c5aa | 461 | |
6d33772f DH |
462 | if (controller) { |
463 | if (bus_name_has_owner(s->manager->bus, controller, NULL) > 0) | |
464 | session_set_controller(s, controller, false); | |
90a18413 DH |
465 | else |
466 | session_restore_vt(s); | |
6d33772f DH |
467 | } |
468 | ||
a185c5aa | 469 | return r; |
20263082 LP |
470 | } |
471 | ||
472 | int session_activate(Session *s) { | |
d7bd01b5 DH |
473 | unsigned int num_pending; |
474 | ||
20263082 | 475 | assert(s); |
9444b1f2 | 476 | assert(s->user); |
20263082 | 477 | |
20263082 | 478 | if (!s->seat) |
15411c0c | 479 | return -EOPNOTSUPP; |
20263082 LP |
480 | |
481 | if (s->seat->active == s) | |
482 | return 0; | |
483 | ||
d7bd01b5 DH |
484 | /* on seats with VTs, we let VTs manage session-switching */ |
485 | if (seat_has_vts(s->seat)) { | |
92bd5ff3 | 486 | if (!s->vtnr) |
15411c0c | 487 | return -EOPNOTSUPP; |
d7bd01b5 DH |
488 | |
489 | return chvt(s->vtnr); | |
490 | } | |
491 | ||
492 | /* On seats without VTs, we implement session-switching in logind. We | |
493 | * try to pause all session-devices and wait until the session | |
494 | * controller acknowledged them. Once all devices are asleep, we simply | |
495 | * switch the active session and be done. | |
496 | * We save the session we want to switch to in seat->pending_switch and | |
497 | * seat_complete_switch() will perform the final switch. */ | |
498 | ||
499 | s->seat->pending_switch = s; | |
500 | ||
501 | /* if no devices are running, immediately perform the session switch */ | |
502 | num_pending = session_device_try_pause_all(s); | |
503 | if (!num_pending) | |
504 | seat_complete_switch(s->seat); | |
20263082 | 505 | |
d7bd01b5 | 506 | return 0; |
20263082 LP |
507 | } |
508 | ||
fb6becb4 | 509 | static int session_start_scope(Session *s) { |
98a28fef LP |
510 | int r; |
511 | ||
512 | assert(s); | |
9444b1f2 | 513 | assert(s->user); |
fb6becb4 | 514 | assert(s->user->slice); |
98a28fef | 515 | |
fb6becb4 | 516 | if (!s->scope) { |
cc377381 | 517 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; |
d0af76e6 | 518 | _cleanup_free_ char *description = NULL; |
39883f62 | 519 | char *scope, *job = NULL; |
d0af76e6 | 520 | |
405e0255 LP |
521 | description = strjoin("Session ", s->id, " of user ", s->user->name, NULL); |
522 | if (!description) | |
523 | return log_oom(); | |
524 | ||
d0af76e6 LP |
525 | scope = strjoin("session-", s->id, ".scope", NULL); |
526 | if (!scope) | |
ae018d9b LP |
527 | return log_oom(); |
528 | ||
646e392e | 529 | r = manager_start_scope(s->manager, scope, s->leader, s->user->slice, description, "systemd-logind.service", "systemd-user-sessions.service", &error, &job); |
d0af76e6 | 530 | if (r < 0) { |
042f5988 | 531 | log_error("Failed to start session scope %s: %s %s", |
cc377381 | 532 | scope, bus_error_message(&error, r), error.name); |
d0af76e6 | 533 | free(scope); |
f2d4f98d | 534 | return r; |
d0af76e6 LP |
535 | } else { |
536 | s->scope = scope; | |
537 | ||
538 | free(s->scope_job); | |
539 | s->scope_job = job; | |
540 | } | |
20263082 LP |
541 | } |
542 | ||
d0af76e6 LP |
543 | if (s->scope) |
544 | hashmap_put(s->manager->session_units, s->scope, s); | |
545 | ||
20263082 LP |
546 | return 0; |
547 | } | |
548 | ||
549 | int session_start(Session *s) { | |
550 | int r; | |
551 | ||
552 | assert(s); | |
9444b1f2 LP |
553 | |
554 | if (!s->user) | |
555 | return -ESTALE; | |
20263082 | 556 | |
9418f147 LP |
557 | if (s->started) |
558 | return 0; | |
559 | ||
ed18b08b LP |
560 | r = user_start(s->user); |
561 | if (r < 0) | |
562 | return r; | |
563 | ||
fb6becb4 LP |
564 | /* Create cgroup */ |
565 | r = session_start_scope(s); | |
566 | if (r < 0) | |
567 | return r; | |
568 | ||
d9eb81f9 | 569 | log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO, |
e2cc6eca | 570 | LOG_MESSAGE_ID(SD_MESSAGE_SESSION_START), |
877d54e9 LP |
571 | "SESSION_ID=%s", s->id, |
572 | "USER_ID=%s", s->user->name, | |
de0671ee | 573 | "LEADER="PID_FMT, s->leader, |
e2cc6eca | 574 | LOG_MESSAGE("New session %s of user %s.", s->id, s->user->name), |
877d54e9 | 575 | NULL); |
98a28fef | 576 | |
9444b1f2 LP |
577 | if (!dual_timestamp_is_set(&s->timestamp)) |
578 | dual_timestamp_get(&s->timestamp); | |
14c3baca | 579 | |
e9816c48 LP |
580 | if (s->seat) |
581 | seat_read_active_vt(s->seat); | |
582 | ||
9418f147 LP |
583 | s->started = true; |
584 | ||
952d3260 LP |
585 | user_elect_display(s->user); |
586 | ||
5f41d1f1 | 587 | /* Save data */ |
e9816c48 | 588 | session_save(s); |
7f7bb946 | 589 | user_save(s->user); |
5f41d1f1 LP |
590 | if (s->seat) |
591 | seat_save(s->seat); | |
e9816c48 | 592 | |
5f41d1f1 | 593 | /* Send signals */ |
da119395 | 594 | session_send_signal(s, true); |
952d3260 | 595 | user_send_changed(s->user, "Sessions", "Display", NULL); |
9418f147 LP |
596 | if (s->seat) { |
597 | if (s->seat->active == s) | |
cc377381 | 598 | seat_send_changed(s->seat, "Sessions", "ActiveSession", NULL); |
9418f147 | 599 | else |
cc377381 | 600 | seat_send_changed(s->seat, "Sessions", NULL); |
9418f147 LP |
601 | } |
602 | ||
20263082 LP |
603 | return 0; |
604 | } | |
605 | ||
9bb69af4 | 606 | static int session_stop_scope(Session *s, bool force) { |
cc377381 | 607 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; |
39883f62 | 608 | char *job = NULL; |
20263082 | 609 | int r; |
20263082 LP |
610 | |
611 | assert(s); | |
612 | ||
fb6becb4 LP |
613 | if (!s->scope) |
614 | return 0; | |
9b221b63 | 615 | |
9bb69af4 | 616 | if (force || manager_shall_kill(s->manager, s->user->name)) { |
5f41d1f1 LP |
617 | r = manager_stop_unit(s->manager, s->scope, &error, &job); |
618 | if (r < 0) { | |
619 | log_error("Failed to stop session scope: %s", bus_error_message(&error, r)); | |
620 | return r; | |
621 | } | |
20263082 | 622 | |
5f41d1f1 LP |
623 | free(s->scope_job); |
624 | s->scope_job = job; | |
625 | } else { | |
626 | r = manager_abandon_scope(s->manager, s->scope, &error); | |
627 | if (r < 0) { | |
628 | log_error("Failed to abandon session scope: %s", bus_error_message(&error, r)); | |
629 | return r; | |
630 | } | |
631 | } | |
20263082 | 632 | |
9b221b63 | 633 | return 0; |
20263082 LP |
634 | } |
635 | ||
9bb69af4 | 636 | int session_stop(Session *s, bool force) { |
405e0255 LP |
637 | int r; |
638 | ||
639 | assert(s); | |
640 | ||
641 | if (!s->user) | |
642 | return -ESTALE; | |
643 | ||
5f41d1f1 LP |
644 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
645 | ||
10189fd6 DH |
646 | if (s->seat) |
647 | seat_evict_position(s->seat, s); | |
648 | ||
5f41d1f1 LP |
649 | /* We are going down, don't care about FIFOs anymore */ |
650 | session_remove_fifo(s); | |
651 | ||
405e0255 | 652 | /* Kill cgroup */ |
9bb69af4 | 653 | r = session_stop_scope(s, force); |
405e0255 | 654 | |
5f41d1f1 LP |
655 | s->stopping = true; |
656 | ||
952d3260 LP |
657 | user_elect_display(s->user); |
658 | ||
405e0255 | 659 | session_save(s); |
cc377381 | 660 | user_save(s->user); |
405e0255 LP |
661 | |
662 | return r; | |
663 | } | |
664 | ||
665 | int session_finalize(Session *s) { | |
118ecf32 | 666 | SessionDevice *sd; |
20263082 LP |
667 | |
668 | assert(s); | |
669 | ||
9444b1f2 LP |
670 | if (!s->user) |
671 | return -ESTALE; | |
672 | ||
ed18b08b | 673 | if (s->started) |
d9eb81f9 | 674 | log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO, |
e2cc6eca | 675 | LOG_MESSAGE_ID(SD_MESSAGE_SESSION_STOP), |
877d54e9 LP |
676 | "SESSION_ID=%s", s->id, |
677 | "USER_ID=%s", s->user->name, | |
de0671ee | 678 | "LEADER="PID_FMT, s->leader, |
e2cc6eca | 679 | LOG_MESSAGE("Removed session %s.", s->id), |
877d54e9 | 680 | NULL); |
98a28fef | 681 | |
5f41d1f1 LP |
682 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
683 | ||
10189fd6 DH |
684 | if (s->seat) |
685 | seat_evict_position(s->seat, s); | |
686 | ||
118ecf32 DH |
687 | /* Kill session devices */ |
688 | while ((sd = hashmap_first(s->devices))) | |
689 | session_device_free(sd); | |
690 | ||
491ac9f2 | 691 | (void) unlink(s->state_file); |
d2f92cdf | 692 | session_add_to_gc_queue(s); |
ed18b08b | 693 | user_add_to_gc_queue(s->user); |
14c3baca | 694 | |
405e0255 | 695 | if (s->started) { |
ed18b08b | 696 | session_send_signal(s, false); |
405e0255 LP |
697 | s->started = false; |
698 | } | |
50fb9793 | 699 | |
9418f147 LP |
700 | if (s->seat) { |
701 | if (s->seat->active == s) | |
702 | seat_set_active(s->seat, NULL); | |
703 | ||
23bd3b62 | 704 | seat_save(s->seat); |
5f41d1f1 | 705 | seat_send_changed(s->seat, "Sessions", NULL); |
9418f147 LP |
706 | } |
707 | ||
23bd3b62 | 708 | user_save(s->user); |
952d3260 | 709 | user_send_changed(s->user, "Sessions", "Display", NULL); |
9418f147 | 710 | |
491ac9f2 | 711 | return 0; |
20263082 LP |
712 | } |
713 | ||
5f41d1f1 LP |
714 | static int release_timeout_callback(sd_event_source *es, uint64_t usec, void *userdata) { |
715 | Session *s = userdata; | |
716 | ||
717 | assert(es); | |
718 | assert(s); | |
719 | ||
9bb69af4 | 720 | session_stop(s, false); |
5f41d1f1 LP |
721 | return 0; |
722 | } | |
723 | ||
ad8780c9 | 724 | int session_release(Session *s) { |
5f41d1f1 LP |
725 | assert(s); |
726 | ||
727 | if (!s->started || s->stopping) | |
ad8780c9 ZJS |
728 | return 0; |
729 | ||
730 | if (s->timer_event_source) | |
731 | return 0; | |
732 | ||
733 | return sd_event_add_time(s->manager->event, | |
734 | &s->timer_event_source, | |
735 | CLOCK_MONOTONIC, | |
736 | now(CLOCK_MONOTONIC) + RELEASE_USEC, 0, | |
737 | release_timeout_callback, s); | |
5f41d1f1 LP |
738 | } |
739 | ||
20263082 LP |
740 | bool session_is_active(Session *s) { |
741 | assert(s); | |
742 | ||
743 | if (!s->seat) | |
744 | return true; | |
745 | ||
746 | return s->seat->active == s; | |
747 | } | |
748 | ||
23406ce5 LP |
749 | static int get_tty_atime(const char *tty, usec_t *atime) { |
750 | _cleanup_free_ char *p = NULL; | |
a185c5aa | 751 | struct stat st; |
23406ce5 LP |
752 | |
753 | assert(tty); | |
754 | assert(atime); | |
755 | ||
756 | if (!path_is_absolute(tty)) { | |
757 | p = strappend("/dev/", tty); | |
758 | if (!p) | |
759 | return -ENOMEM; | |
760 | ||
761 | tty = p; | |
762 | } else if (!path_startswith(tty, "/dev/")) | |
763 | return -ENOENT; | |
764 | ||
765 | if (lstat(tty, &st) < 0) | |
766 | return -errno; | |
767 | ||
768 | *atime = timespec_load(&st.st_atim); | |
769 | return 0; | |
770 | } | |
771 | ||
772 | static int get_process_ctty_atime(pid_t pid, usec_t *atime) { | |
773 | _cleanup_free_ char *p = NULL; | |
774 | int r; | |
775 | ||
776 | assert(pid > 0); | |
777 | assert(atime); | |
778 | ||
779 | r = get_ctty(pid, NULL, &p); | |
780 | if (r < 0) | |
781 | return r; | |
782 | ||
783 | return get_tty_atime(p, atime); | |
784 | } | |
785 | ||
786 | int session_get_idle_hint(Session *s, dual_timestamp *t) { | |
23406ce5 LP |
787 | usec_t atime = 0, n; |
788 | int r; | |
a185c5aa LP |
789 | |
790 | assert(s); | |
791 | ||
23406ce5 | 792 | /* Explicit idle hint is set */ |
a185c5aa LP |
793 | if (s->idle_hint) { |
794 | if (t) | |
795 | *t = s->idle_hint_timestamp; | |
796 | ||
797 | return s->idle_hint; | |
798 | } | |
799 | ||
0762eaa3 | 800 | /* Graphical sessions should really implement a real |
23406ce5 LP |
801 | * idle hint logic */ |
802 | if (s->display) | |
a185c5aa LP |
803 | goto dont_know; |
804 | ||
23406ce5 LP |
805 | /* For sessions with an explicitly configured tty, let's check |
806 | * its atime */ | |
807 | if (s->tty) { | |
808 | r = get_tty_atime(s->tty, &atime); | |
809 | if (r >= 0) | |
810 | goto found_atime; | |
811 | } | |
a185c5aa | 812 | |
23406ce5 LP |
813 | /* For sessions with a leader but no explicitly configured |
814 | * tty, let's check the controlling tty of the leader */ | |
815 | if (s->leader > 0) { | |
816 | r = get_process_ctty_atime(s->leader, &atime); | |
817 | if (r >= 0) | |
818 | goto found_atime; | |
a185c5aa LP |
819 | } |
820 | ||
a185c5aa LP |
821 | dont_know: |
822 | if (t) | |
823 | *t = s->idle_hint_timestamp; | |
824 | ||
825 | return 0; | |
23406ce5 LP |
826 | |
827 | found_atime: | |
828 | if (t) | |
829 | dual_timestamp_from_realtime(t, atime); | |
830 | ||
831 | n = now(CLOCK_REALTIME); | |
832 | ||
833 | if (s->manager->idle_action_usec <= 0) | |
834 | return 0; | |
835 | ||
836 | return atime + s->manager->idle_action_usec <= n; | |
a185c5aa LP |
837 | } |
838 | ||
bef422ae LP |
839 | void session_set_idle_hint(Session *s, bool b) { |
840 | assert(s); | |
841 | ||
842 | if (s->idle_hint == b) | |
843 | return; | |
844 | ||
845 | s->idle_hint = b; | |
846 | dual_timestamp_get(&s->idle_hint_timestamp); | |
9418f147 | 847 | |
cc377381 | 848 | session_send_changed(s, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); |
9418f147 LP |
849 | |
850 | if (s->seat) | |
cc377381 LP |
851 | seat_send_changed(s->seat, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); |
852 | ||
853 | user_send_changed(s->user, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); | |
854 | manager_send_changed(s->manager, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); | |
855 | } | |
856 | ||
857 | static int session_dispatch_fifo(sd_event_source *es, int fd, uint32_t revents, void *userdata) { | |
858 | Session *s = userdata; | |
859 | ||
860 | assert(s); | |
861 | assert(s->fifo_fd == fd); | |
862 | ||
863 | /* EOF on the FIFO means the session died abnormally. */ | |
864 | ||
865 | session_remove_fifo(s); | |
9bb69af4 | 866 | session_stop(s, false); |
cc377381 LP |
867 | |
868 | return 1; | |
bef422ae LP |
869 | } |
870 | ||
932e3ee7 LP |
871 | int session_create_fifo(Session *s) { |
872 | int r; | |
873 | ||
31b79c2b LP |
874 | assert(s); |
875 | ||
b4f78aea | 876 | /* Create FIFO */ |
932e3ee7 | 877 | if (!s->fifo_path) { |
d2e54fae | 878 | r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0); |
e6061ab2 LP |
879 | if (r < 0) |
880 | return r; | |
881 | ||
932e3ee7 LP |
882 | if (asprintf(&s->fifo_path, "/run/systemd/sessions/%s.ref", s->id) < 0) |
883 | return -ENOMEM; | |
31b79c2b | 884 | |
932e3ee7 LP |
885 | if (mkfifo(s->fifo_path, 0600) < 0 && errno != EEXIST) |
886 | return -errno; | |
887 | } | |
31b79c2b | 888 | |
932e3ee7 | 889 | /* Open reading side */ |
b4f78aea | 890 | if (s->fifo_fd < 0) { |
b4f78aea LP |
891 | s->fifo_fd = open(s->fifo_path, O_RDONLY|O_CLOEXEC|O_NDELAY); |
892 | if (s->fifo_fd < 0) | |
893 | return -errno; | |
894 | ||
cc377381 LP |
895 | } |
896 | ||
897 | if (!s->fifo_event_source) { | |
151b9b96 | 898 | r = sd_event_add_io(s->manager->event, &s->fifo_event_source, s->fifo_fd, 0, session_dispatch_fifo, s); |
b4f78aea LP |
899 | if (r < 0) |
900 | return r; | |
901 | ||
718db961 | 902 | r = sd_event_source_set_priority(s->fifo_event_source, SD_EVENT_PRIORITY_IDLE); |
cc377381 LP |
903 | if (r < 0) |
904 | return r; | |
b4f78aea | 905 | } |
932e3ee7 LP |
906 | |
907 | /* Open writing side */ | |
908 | r = open(s->fifo_path, O_WRONLY|O_CLOEXEC|O_NDELAY); | |
909 | if (r < 0) | |
910 | return -errno; | |
31b79c2b | 911 | |
932e3ee7 LP |
912 | return r; |
913 | } | |
914 | ||
5f41d1f1 | 915 | static void session_remove_fifo(Session *s) { |
932e3ee7 LP |
916 | assert(s); |
917 | ||
03e334a1 LP |
918 | s->fifo_event_source = sd_event_source_unref(s->fifo_event_source); |
919 | s->fifo_fd = safe_close(s->fifo_fd); | |
932e3ee7 LP |
920 | |
921 | if (s->fifo_path) { | |
922 | unlink(s->fifo_path); | |
a1e58e8e | 923 | s->fifo_path = mfree(s->fifo_path); |
932e3ee7 | 924 | } |
31b79c2b LP |
925 | } |
926 | ||
cc377381 | 927 | bool session_check_gc(Session *s, bool drop_not_started) { |
20263082 LP |
928 | assert(s); |
929 | ||
4a4b033f | 930 | if (drop_not_started && !s->started) |
cc377381 | 931 | return false; |
932e3ee7 | 932 | |
9444b1f2 | 933 | if (!s->user) |
cc377381 | 934 | return false; |
9444b1f2 | 935 | |
932e3ee7 | 936 | if (s->fifo_fd >= 0) { |
5f41d1f1 | 937 | if (pipe_eof(s->fifo_fd) <= 0) |
cc377381 | 938 | return true; |
20263082 LP |
939 | } |
940 | ||
cc377381 LP |
941 | if (s->scope_job && manager_job_is_active(s->manager, s->scope_job)) |
942 | return true; | |
20263082 | 943 | |
cc377381 LP |
944 | if (s->scope && manager_unit_is_active(s->manager, s->scope)) |
945 | return true; | |
20263082 | 946 | |
cc377381 | 947 | return false; |
20263082 LP |
948 | } |
949 | ||
14c3baca LP |
950 | void session_add_to_gc_queue(Session *s) { |
951 | assert(s); | |
952 | ||
953 | if (s->in_gc_queue) | |
954 | return; | |
955 | ||
71fda00f | 956 | LIST_PREPEND(gc_queue, s->manager->session_gc_queue, s); |
14c3baca LP |
957 | s->in_gc_queue = true; |
958 | } | |
959 | ||
0604381b LP |
960 | SessionState session_get_state(Session *s) { |
961 | assert(s); | |
962 | ||
8fe63cd4 | 963 | /* always check closing first */ |
5f41d1f1 LP |
964 | if (s->stopping || s->timer_event_source) |
965 | return SESSION_CLOSING; | |
966 | ||
8fe63cd4 | 967 | if (s->scope_job || s->fifo_fd < 0) |
405e0255 | 968 | return SESSION_OPENING; |
fb6becb4 | 969 | |
0604381b LP |
970 | if (session_is_active(s)) |
971 | return SESSION_ACTIVE; | |
972 | ||
973 | return SESSION_ONLINE; | |
974 | } | |
975 | ||
de07ab16 | 976 | int session_kill(Session *s, KillWho who, int signo) { |
de07ab16 LP |
977 | assert(s); |
978 | ||
fb6becb4 | 979 | if (!s->scope) |
de07ab16 LP |
980 | return -ESRCH; |
981 | ||
fb6becb4 | 982 | return manager_kill_unit(s->manager, s->scope, who, signo, NULL); |
de07ab16 LP |
983 | } |
984 | ||
90a18413 | 985 | static int session_open_vt(Session *s) { |
5f41d1f1 | 986 | char path[sizeof("/dev/tty") + DECIMAL_STR_MAX(s->vtnr)]; |
90a18413 | 987 | |
baccf3e4 OB |
988 | if (s->vtnr < 1) |
989 | return -ENODEV; | |
90a18413 DH |
990 | |
991 | if (s->vtfd >= 0) | |
992 | return s->vtfd; | |
993 | ||
92bd5ff3 | 994 | sprintf(path, "/dev/tty%u", s->vtnr); |
22356953 | 995 | s->vtfd = open_terminal(path, O_RDWR | O_CLOEXEC | O_NONBLOCK | O_NOCTTY); |
4a62c710 MS |
996 | if (s->vtfd < 0) |
997 | return log_error_errno(errno, "cannot open VT %s of session %s: %m", path, s->id); | |
90a18413 DH |
998 | |
999 | return s->vtfd; | |
1000 | } | |
1001 | ||
baccf3e4 | 1002 | int session_prepare_vt(Session *s) { |
90a18413 DH |
1003 | int vt, r; |
1004 | struct vt_mode mode = { 0 }; | |
90a18413 | 1005 | |
baccf3e4 OB |
1006 | if (s->vtnr < 1) |
1007 | return 0; | |
1008 | ||
90a18413 DH |
1009 | vt = session_open_vt(s); |
1010 | if (vt < 0) | |
baccf3e4 | 1011 | return vt; |
90a18413 | 1012 | |
d6176c6c | 1013 | r = fchown(vt, s->user->uid, -1); |
baccf3e4 | 1014 | if (r < 0) { |
94c156cd LP |
1015 | r = log_error_errno(errno, |
1016 | "Cannot change owner of /dev/tty%u: %m", | |
1017 | s->vtnr); | |
d6176c6c | 1018 | goto error; |
baccf3e4 | 1019 | } |
d6176c6c | 1020 | |
90a18413 | 1021 | r = ioctl(vt, KDSKBMODE, K_OFF); |
baccf3e4 | 1022 | if (r < 0) { |
94c156cd LP |
1023 | r = log_error_errno(errno, |
1024 | "Cannot set K_OFF on /dev/tty%u: %m", | |
1025 | s->vtnr); | |
90a18413 | 1026 | goto error; |
baccf3e4 | 1027 | } |
90a18413 DH |
1028 | |
1029 | r = ioctl(vt, KDSETMODE, KD_GRAPHICS); | |
baccf3e4 | 1030 | if (r < 0) { |
94c156cd LP |
1031 | r = log_error_errno(errno, |
1032 | "Cannot set KD_GRAPHICS on /dev/tty%u: %m", | |
1033 | s->vtnr); | |
90a18413 | 1034 | goto error; |
baccf3e4 | 1035 | } |
90a18413 | 1036 | |
90a18413 DH |
1037 | /* Oh, thanks to the VT layer, VT_AUTO does not work with KD_GRAPHICS. |
1038 | * So we need a dummy handler here which just acknowledges *all* VT | |
1039 | * switch requests. */ | |
1040 | mode.mode = VT_PROCESS; | |
92683ad2 DH |
1041 | mode.relsig = SIGRTMIN; |
1042 | mode.acqsig = SIGRTMIN + 1; | |
90a18413 | 1043 | r = ioctl(vt, VT_SETMODE, &mode); |
baccf3e4 | 1044 | if (r < 0) { |
94c156cd LP |
1045 | r = log_error_errno(errno, |
1046 | "Cannot set VT_PROCESS on /dev/tty%u: %m", | |
1047 | s->vtnr); | |
90a18413 | 1048 | goto error; |
baccf3e4 | 1049 | } |
90a18413 | 1050 | |
baccf3e4 | 1051 | return 0; |
90a18413 DH |
1052 | |
1053 | error: | |
90a18413 | 1054 | session_restore_vt(s); |
baccf3e4 | 1055 | return r; |
90a18413 DH |
1056 | } |
1057 | ||
1058 | void session_restore_vt(Session *s) { | |
16597ac3 LP |
1059 | |
1060 | static const struct vt_mode mode = { | |
1061 | .mode = VT_AUTO, | |
1062 | }; | |
1063 | ||
a0eb2a75 | 1064 | _cleanup_free_ char *utf8 = NULL; |
16597ac3 | 1065 | int vt, kb, old_fd; |
90a18413 | 1066 | |
128df4cf OT |
1067 | /* We need to get a fresh handle to the virtual terminal, |
1068 | * since the old file-descriptor is potentially in a hung-up | |
1069 | * state after the controlling process exited; we do a | |
1070 | * little dance to avoid having the terminal be available | |
1071 | * for reuse before we've cleaned it up. | |
1072 | */ | |
16597ac3 | 1073 | old_fd = s->vtfd; |
128df4cf OT |
1074 | s->vtfd = -1; |
1075 | ||
90a18413 | 1076 | vt = session_open_vt(s); |
128df4cf OT |
1077 | safe_close(old_fd); |
1078 | ||
90a18413 DH |
1079 | if (vt < 0) |
1080 | return; | |
1081 | ||
2bf10523 | 1082 | (void) ioctl(vt, KDSETMODE, KD_TEXT); |
90a18413 DH |
1083 | |
1084 | if (read_one_line_file("/sys/module/vt/parameters/default_utf8", &utf8) >= 0 && *utf8 == '1') | |
1085 | kb = K_UNICODE; | |
16597ac3 LP |
1086 | else |
1087 | kb = K_XLATE; | |
03e334a1 | 1088 | |
2bf10523 | 1089 | (void) ioctl(vt, KDSKBMODE, kb); |
90a18413 | 1090 | |
2bf10523 | 1091 | (void) ioctl(vt, VT_SETMODE, &mode); |
16597ac3 | 1092 | (void) fchown(vt, 0, (gid_t) -1); |
d6176c6c | 1093 | |
03e334a1 | 1094 | s->vtfd = safe_close(s->vtfd); |
90a18413 DH |
1095 | } |
1096 | ||
2ec3ff66 | 1097 | void session_leave_vt(Session *s) { |
ce540a24 DH |
1098 | int r; |
1099 | ||
2ec3ff66 DH |
1100 | assert(s); |
1101 | ||
1102 | /* This is called whenever we get a VT-switch signal from the kernel. | |
1103 | * We acknowledge all of them unconditionally. Note that session are | |
1104 | * free to overwrite those handlers and we only register them for | |
1105 | * sessions with controllers. Legacy sessions are not affected. | |
1106 | * However, if we switch from a non-legacy to a legacy session, we must | |
1107 | * make sure to pause all device before acknowledging the switch. We | |
1108 | * process the real switch only after we are notified via sysfs, so the | |
1109 | * legacy session might have already started using the devices. If we | |
1110 | * don't pause the devices before the switch, we might confuse the | |
1111 | * session we switch to. */ | |
1112 | ||
1113 | if (s->vtfd < 0) | |
1114 | return; | |
1115 | ||
1116 | session_device_pause_all(s); | |
ce540a24 DH |
1117 | r = ioctl(s->vtfd, VT_RELDISP, 1); |
1118 | if (r < 0) | |
56f64d95 | 1119 | log_debug_errno(errno, "Cannot release VT of session %s: %m", s->id); |
2ec3ff66 DH |
1120 | } |
1121 | ||
cc377381 | 1122 | bool session_is_controller(Session *s, const char *sender) { |
ae5e06bd DH |
1123 | assert(s); |
1124 | ||
1125 | return streq_ptr(s->controller, sender); | |
1126 | } | |
1127 | ||
b12e5615 DH |
1128 | static void session_release_controller(Session *s, bool notify) { |
1129 | _cleanup_free_ char *name = NULL; | |
6d33772f DH |
1130 | SessionDevice *sd; |
1131 | ||
b12e5615 DH |
1132 | if (!s->controller) |
1133 | return; | |
6d33772f | 1134 | |
b12e5615 | 1135 | name = s->controller; |
90a18413 | 1136 | |
b12e5615 DH |
1137 | /* By resetting the controller before releasing the devices, we won't |
1138 | * send notification signals. This avoids sending useless notifications | |
1139 | * if the controller is released on disconnects. */ | |
1140 | if (!notify) | |
1141 | s->controller = NULL; | |
6d33772f | 1142 | |
b12e5615 DH |
1143 | while ((sd = hashmap_first(s->devices))) |
1144 | session_device_free(sd); | |
1145 | ||
1146 | s->controller = NULL; | |
3cde9e8f DM |
1147 | s->track = sd_bus_track_unref(s->track); |
1148 | } | |
1149 | ||
1150 | static int on_bus_track(sd_bus_track *track, void *userdata) { | |
1151 | Session *s = userdata; | |
1152 | ||
1153 | assert(track); | |
1154 | assert(s); | |
1155 | ||
1156 | session_drop_controller(s); | |
1157 | ||
1158 | return 0; | |
6d33772f DH |
1159 | } |
1160 | ||
ae5e06bd | 1161 | int session_set_controller(Session *s, const char *sender, bool force) { |
b12e5615 | 1162 | _cleanup_free_ char *name = NULL; |
ae5e06bd DH |
1163 | int r; |
1164 | ||
1165 | assert(s); | |
1166 | assert(sender); | |
1167 | ||
1168 | if (session_is_controller(s, sender)) | |
1169 | return 0; | |
1170 | if (s->controller && !force) | |
1171 | return -EBUSY; | |
1172 | ||
b12e5615 DH |
1173 | name = strdup(sender); |
1174 | if (!name) | |
ae5e06bd DH |
1175 | return -ENOMEM; |
1176 | ||
3cde9e8f DM |
1177 | s->track = sd_bus_track_unref(s->track); |
1178 | r = sd_bus_track_new(s->manager->bus, &s->track, on_bus_track, s); | |
1179 | if (r < 0) | |
1180 | return r; | |
1181 | ||
1182 | r = sd_bus_track_add_name(s->track, name); | |
1183 | if (r < 0) | |
ae5e06bd | 1184 | return r; |
ae5e06bd | 1185 | |
90a18413 DH |
1186 | /* When setting a session controller, we forcibly mute the VT and set |
1187 | * it into graphics-mode. Applications can override that by changing | |
1188 | * VT state after calling TakeControl(). However, this serves as a good | |
1189 | * default and well-behaving controllers can now ignore VTs entirely. | |
1190 | * Note that we reset the VT on ReleaseControl() and if the controller | |
1191 | * exits. | |
1192 | * If logind crashes/restarts, we restore the controller during restart | |
1193 | * or reset the VT in case it crashed/exited, too. */ | |
baccf3e4 | 1194 | r = session_prepare_vt(s); |
13f493dc | 1195 | if (r < 0) { |
3cde9e8f | 1196 | s->track = sd_bus_track_unref(s->track); |
baccf3e4 | 1197 | return r; |
13f493dc | 1198 | } |
baccf3e4 | 1199 | |
b12e5615 DH |
1200 | session_release_controller(s, true); |
1201 | s->controller = name; | |
1202 | name = NULL; | |
1203 | session_save(s); | |
90a18413 | 1204 | |
ae5e06bd DH |
1205 | return 0; |
1206 | } | |
1207 | ||
1208 | void session_drop_controller(Session *s) { | |
1209 | assert(s); | |
1210 | ||
1211 | if (!s->controller) | |
1212 | return; | |
1213 | ||
3cde9e8f | 1214 | s->track = sd_bus_track_unref(s->track); |
b12e5615 DH |
1215 | session_release_controller(s, false); |
1216 | session_save(s); | |
1217 | session_restore_vt(s); | |
ae5e06bd DH |
1218 | } |
1219 | ||
fb6becb4 LP |
1220 | static const char* const session_state_table[_SESSION_STATE_MAX] = { |
1221 | [SESSION_OPENING] = "opening", | |
0604381b LP |
1222 | [SESSION_ONLINE] = "online", |
1223 | [SESSION_ACTIVE] = "active", | |
1224 | [SESSION_CLOSING] = "closing" | |
1225 | }; | |
1226 | ||
1227 | DEFINE_STRING_TABLE_LOOKUP(session_state, SessionState); | |
1228 | ||
20263082 | 1229 | static const char* const session_type_table[_SESSION_TYPE_MAX] = { |
2c5859af | 1230 | [SESSION_UNSPECIFIED] = "unspecified", |
3f49d45a | 1231 | [SESSION_TTY] = "tty", |
98a28fef | 1232 | [SESSION_X11] = "x11", |
d9eb81f9 | 1233 | [SESSION_WAYLAND] = "wayland", |
9541666b | 1234 | [SESSION_MIR] = "mir", |
e9e74f28 | 1235 | [SESSION_WEB] = "web", |
20263082 LP |
1236 | }; |
1237 | ||
1238 | DEFINE_STRING_TABLE_LOOKUP(session_type, SessionType); | |
de07ab16 | 1239 | |
55efac6c LP |
1240 | static const char* const session_class_table[_SESSION_CLASS_MAX] = { |
1241 | [SESSION_USER] = "user", | |
1242 | [SESSION_GREETER] = "greeter", | |
e2acb67b LP |
1243 | [SESSION_LOCK_SCREEN] = "lock-screen", |
1244 | [SESSION_BACKGROUND] = "background" | |
55efac6c LP |
1245 | }; |
1246 | ||
1247 | DEFINE_STRING_TABLE_LOOKUP(session_class, SessionClass); | |
1248 | ||
de07ab16 LP |
1249 | static const char* const kill_who_table[_KILL_WHO_MAX] = { |
1250 | [KILL_LEADER] = "leader", | |
1251 | [KILL_ALL] = "all" | |
1252 | }; | |
1253 | ||
1254 | DEFINE_STRING_TABLE_LOOKUP(kill_who, KillWho); |