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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 | |
20263082 LP |
6 | ***/ |
7 | ||
8 | #include <errno.h> | |
90a18413 | 9 | #include <fcntl.h> |
90a18413 | 10 | #include <linux/kd.h> |
4f5dd394 | 11 | #include <linux/vt.h> |
90a18413 | 12 | #include <signal.h> |
20263082 | 13 | #include <string.h> |
90a18413 | 14 | #include <sys/ioctl.h> |
20263082 LP |
15 | #include <unistd.h> |
16 | ||
cc377381 | 17 | #include "sd-messages.h" |
4f5dd394 | 18 | |
b5efdb8a | 19 | #include "alloc-util.h" |
430f0182 | 20 | #include "audit-util.h" |
cc377381 | 21 | #include "bus-error.h" |
4f5dd394 LP |
22 | #include "bus-util.h" |
23 | #include "escape.h" | |
3ffd4af2 | 24 | #include "fd-util.h" |
4f5dd394 | 25 | #include "fileio.h" |
f97b34a6 | 26 | #include "format-util.h" |
c004493c | 27 | #include "io-util.h" |
3ffd4af2 | 28 | #include "logind-session.h" |
4f5dd394 | 29 | #include "mkdir.h" |
6bedfcbb | 30 | #include "parse-util.h" |
4f5dd394 | 31 | #include "path-util.h" |
8b43440b | 32 | #include "string-table.h" |
288a74cc | 33 | #include "terminal-util.h" |
b1d4f8e1 | 34 | #include "user-util.h" |
4f5dd394 | 35 | #include "util.h" |
54191eb3 | 36 | #include "process-util.h" |
20263082 | 37 | |
5f41d1f1 LP |
38 | #define RELEASE_USEC (20*USEC_PER_SEC) |
39 | ||
40 | static void session_remove_fifo(Session *s); | |
41 | ||
9444b1f2 | 42 | Session* session_new(Manager *m, const char *id) { |
20263082 LP |
43 | Session *s; |
44 | ||
45 | assert(m); | |
46 | assert(id); | |
4b549144 | 47 | assert(session_id_valid(id)); |
20263082 | 48 | |
14c3baca | 49 | s = new0(Session, 1); |
20263082 LP |
50 | if (!s) |
51 | return NULL; | |
52 | ||
98a28fef | 53 | s->state_file = strappend("/run/systemd/sessions/", id); |
6b430fdb ZJS |
54 | if (!s->state_file) |
55 | return mfree(s); | |
20263082 | 56 | |
d5099efc | 57 | s->devices = hashmap_new(&devt_hash_ops); |
118ecf32 DH |
58 | if (!s->devices) { |
59 | free(s->state_file); | |
6b430fdb | 60 | return mfree(s); |
118ecf32 DH |
61 | } |
62 | ||
2b6bf07d | 63 | s->id = basename(s->state_file); |
20263082 LP |
64 | |
65 | if (hashmap_put(m->sessions, s->id, s) < 0) { | |
118ecf32 | 66 | hashmap_free(s->devices); |
f8e2fb7b | 67 | free(s->state_file); |
6b430fdb | 68 | return mfree(s); |
20263082 LP |
69 | } |
70 | ||
71 | s->manager = m; | |
932e3ee7 | 72 | s->fifo_fd = -1; |
90a18413 | 73 | s->vtfd = -1; |
3a87a86e | 74 | s->audit_id = AUDIT_SESSION_INVALID; |
20263082 LP |
75 | |
76 | return s; | |
77 | } | |
78 | ||
79 | void session_free(Session *s) { | |
118ecf32 DH |
80 | SessionDevice *sd; |
81 | ||
20263082 LP |
82 | assert(s); |
83 | ||
14c3baca | 84 | if (s->in_gc_queue) |
71fda00f | 85 | LIST_REMOVE(gc_queue, s->manager->session_gc_queue, s); |
14c3baca | 86 | |
5f41d1f1 LP |
87 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
88 | ||
cc377381 LP |
89 | session_remove_fifo(s); |
90 | ||
ae5e06bd DH |
91 | session_drop_controller(s); |
92 | ||
118ecf32 DH |
93 | while ((sd = hashmap_first(s->devices))) |
94 | session_device_free(sd); | |
95 | ||
96 | hashmap_free(s->devices); | |
97 | ||
20263082 | 98 | if (s->user) { |
71fda00f | 99 | LIST_REMOVE(sessions_by_user, s->user->sessions, s); |
20263082 LP |
100 | |
101 | if (s->user->display == s) | |
102 | s->user->display = NULL; | |
103 | } | |
104 | ||
9418f147 LP |
105 | if (s->seat) { |
106 | if (s->seat->active == s) | |
107 | s->seat->active = NULL; | |
d7bd01b5 DH |
108 | if (s->seat->pending_switch == s) |
109 | s->seat->pending_switch = NULL; | |
9418f147 | 110 | |
49e6fdbf | 111 | seat_evict_position(s->seat, s); |
71fda00f | 112 | LIST_REMOVE(sessions_by_seat, s->seat->sessions, s); |
9418f147 | 113 | } |
20263082 | 114 | |
fb6becb4 LP |
115 | if (s->scope) { |
116 | hashmap_remove(s->manager->session_units, s->scope); | |
117 | free(s->scope); | |
118 | } | |
119 | ||
120 | free(s->scope_job); | |
1713813d | 121 | |
cc377381 | 122 | sd_bus_message_unref(s->create_message); |
20263082 LP |
123 | |
124 | free(s->tty); | |
125 | free(s->display); | |
126 | free(s->remote_host); | |
3f49d45a | 127 | free(s->remote_user); |
98a28fef | 128 | free(s->service); |
a4cd87e9 | 129 | free(s->desktop); |
20263082 LP |
130 | |
131 | hashmap_remove(s->manager->sessions, s->id); | |
98a28fef | 132 | |
d2f92cdf | 133 | free(s->state_file); |
20263082 LP |
134 | free(s); |
135 | } | |
136 | ||
9444b1f2 LP |
137 | void session_set_user(Session *s, User *u) { |
138 | assert(s); | |
139 | assert(!s->user); | |
140 | ||
141 | s->user = u; | |
71fda00f | 142 | LIST_PREPEND(sessions_by_user, u->sessions, s); |
9444b1f2 LP |
143 | } |
144 | ||
aed24c4c FB |
145 | static void session_save_devices(Session *s, FILE *f) { |
146 | SessionDevice *sd; | |
147 | Iterator i; | |
148 | ||
149 | if (!hashmap_isempty(s->devices)) { | |
150 | fprintf(f, "DEVICES="); | |
151 | HASHMAP_FOREACH(sd, s->devices, i) | |
152 | fprintf(f, "%u:%u ", major(sd->dev), minor(sd->dev)); | |
153 | fprintf(f, "\n"); | |
154 | } | |
155 | } | |
156 | ||
20263082 | 157 | int session_save(Session *s) { |
507f22bd | 158 | _cleanup_free_ char *temp_path = NULL; |
cc377381 | 159 | _cleanup_fclose_ FILE *f = NULL; |
20263082 LP |
160 | int r = 0; |
161 | ||
162 | assert(s); | |
163 | ||
9444b1f2 LP |
164 | if (!s->user) |
165 | return -ESTALE; | |
166 | ||
accaeded LP |
167 | if (!s->started) |
168 | return 0; | |
169 | ||
37c1d5e9 | 170 | r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0, MKDIR_WARN_MODE); |
20263082 | 171 | if (r < 0) |
dacd6cee | 172 | goto fail; |
20263082 | 173 | |
14c3baca LP |
174 | r = fopen_temporary(s->state_file, &f, &temp_path); |
175 | if (r < 0) | |
dacd6cee | 176 | goto fail; |
20263082 LP |
177 | |
178 | assert(s->user); | |
179 | ||
14c3baca LP |
180 | fchmod(fileno(f), 0644); |
181 | ||
20263082 LP |
182 | fprintf(f, |
183 | "# This is private data. Do not parse.\n" | |
90b2de37 | 184 | "UID="UID_FMT"\n" |
20263082 LP |
185 | "USER=%s\n" |
186 | "ACTIVE=%i\n" | |
0604381b | 187 | "STATE=%s\n" |
fb6becb4 | 188 | "REMOTE=%i\n", |
90b2de37 | 189 | s->user->uid, |
20263082 LP |
190 | s->user->name, |
191 | session_is_active(s), | |
0604381b | 192 | session_state_to_string(session_get_state(s)), |
fb6becb4 | 193 | s->remote); |
20263082 | 194 | |
a91e4e53 | 195 | if (s->type >= 0) |
507f22bd | 196 | fprintf(f, "TYPE=%s\n", session_type_to_string(s->type)); |
a91e4e53 | 197 | |
55efac6c | 198 | if (s->class >= 0) |
507f22bd | 199 | fprintf(f, "CLASS=%s\n", session_class_to_string(s->class)); |
55efac6c | 200 | |
fb6becb4 LP |
201 | if (s->scope) |
202 | fprintf(f, "SCOPE=%s\n", s->scope); | |
fb6becb4 LP |
203 | if (s->scope_job) |
204 | fprintf(f, "SCOPE_JOB=%s\n", s->scope_job); | |
20263082 | 205 | |
932e3ee7 | 206 | if (s->fifo_path) |
507f22bd | 207 | fprintf(f, "FIFO=%s\n", s->fifo_path); |
932e3ee7 | 208 | |
20263082 | 209 | if (s->seat) |
507f22bd | 210 | fprintf(f, "SEAT=%s\n", s->seat->id); |
20263082 LP |
211 | |
212 | if (s->tty) | |
507f22bd | 213 | fprintf(f, "TTY=%s\n", s->tty); |
20263082 LP |
214 | |
215 | if (s->display) | |
507f22bd | 216 | fprintf(f, "DISPLAY=%s\n", s->display); |
20263082 | 217 | |
558c6490 LP |
218 | if (s->remote_host) { |
219 | _cleanup_free_ char *escaped; | |
220 | ||
221 | escaped = cescape(s->remote_host); | |
222 | if (!escaped) { | |
223 | r = -ENOMEM; | |
dacd6cee | 224 | goto fail; |
558c6490 LP |
225 | } |
226 | ||
227 | fprintf(f, "REMOTE_HOST=%s\n", escaped); | |
228 | } | |
229 | ||
230 | if (s->remote_user) { | |
231 | _cleanup_free_ char *escaped; | |
232 | ||
233 | escaped = cescape(s->remote_user); | |
234 | if (!escaped) { | |
235 | r = -ENOMEM; | |
dacd6cee | 236 | goto fail; |
558c6490 LP |
237 | } |
238 | ||
239 | fprintf(f, "REMOTE_USER=%s\n", escaped); | |
240 | } | |
241 | ||
242 | if (s->service) { | |
243 | _cleanup_free_ char *escaped; | |
20263082 | 244 | |
558c6490 LP |
245 | escaped = cescape(s->service); |
246 | if (!escaped) { | |
247 | r = -ENOMEM; | |
dacd6cee | 248 | goto fail; |
558c6490 LP |
249 | } |
250 | ||
251 | fprintf(f, "SERVICE=%s\n", escaped); | |
252 | } | |
3f49d45a | 253 | |
558c6490 LP |
254 | if (s->desktop) { |
255 | _cleanup_free_ char *escaped; | |
98a28fef | 256 | |
558c6490 LP |
257 | |
258 | escaped = cescape(s->desktop); | |
259 | if (!escaped) { | |
260 | r = -ENOMEM; | |
dacd6cee | 261 | goto fail; |
558c6490 LP |
262 | } |
263 | ||
264 | fprintf(f, "DESKTOP=%s\n", escaped); | |
265 | } | |
a4cd87e9 | 266 | |
bf7825ae | 267 | if (s->seat && seat_has_vts(s->seat)) |
92bd5ff3 | 268 | fprintf(f, "VTNR=%u\n", s->vtnr); |
20263082 | 269 | |
49e6fdbf | 270 | if (!s->vtnr) |
e6494a07 | 271 | fprintf(f, "POSITION=%u\n", s->position); |
49e6fdbf | 272 | |
54191eb3 | 273 | if (pid_is_valid(s->leader)) |
90b2de37 | 274 | fprintf(f, "LEADER="PID_FMT"\n", s->leader); |
20263082 | 275 | |
3a87a86e | 276 | if (audit_session_is_valid(s->audit_id)) |
507f22bd | 277 | fprintf(f, "AUDIT=%"PRIu32"\n", s->audit_id); |
20263082 | 278 | |
9444b1f2 LP |
279 | if (dual_timestamp_is_set(&s->timestamp)) |
280 | fprintf(f, | |
90b2de37 ZJS |
281 | "REALTIME="USEC_FMT"\n" |
282 | "MONOTONIC="USEC_FMT"\n", | |
283 | s->timestamp.realtime, | |
284 | s->timestamp.monotonic); | |
9444b1f2 | 285 | |
aed24c4c | 286 | if (s->controller) { |
6d33772f | 287 | fprintf(f, "CONTROLLER=%s\n", s->controller); |
aed24c4c FB |
288 | session_save_devices(s, f); |
289 | } | |
6d33772f | 290 | |
dacd6cee LP |
291 | r = fflush_and_check(f); |
292 | if (r < 0) | |
293 | goto fail; | |
14c3baca | 294 | |
dacd6cee | 295 | if (rename(temp_path, s->state_file) < 0) { |
20263082 | 296 | r = -errno; |
dacd6cee | 297 | goto fail; |
20263082 LP |
298 | } |
299 | ||
dacd6cee LP |
300 | return 0; |
301 | ||
302 | fail: | |
303 | (void) unlink(s->state_file); | |
14c3baca | 304 | |
dacd6cee LP |
305 | if (temp_path) |
306 | (void) unlink(temp_path); | |
307 | ||
308 | return log_error_errno(r, "Failed to save session data %s: %m", s->state_file); | |
20263082 LP |
309 | } |
310 | ||
aed24c4c FB |
311 | static int session_load_devices(Session *s, const char *devices) { |
312 | const char *p; | |
313 | int r = 0; | |
314 | ||
315 | assert(s); | |
316 | ||
317 | for (p = devices;;) { | |
318 | _cleanup_free_ char *word = NULL; | |
319 | SessionDevice *sd; | |
320 | dev_t dev; | |
321 | int k; | |
322 | ||
323 | k = extract_first_word(&p, &word, NULL, 0); | |
324 | if (k == 0) | |
325 | break; | |
326 | if (k < 0) { | |
327 | r = k; | |
328 | break; | |
329 | } | |
330 | ||
331 | k = parse_dev(word, &dev); | |
332 | if (k < 0) { | |
333 | r = k; | |
334 | continue; | |
335 | } | |
336 | ||
337 | /* The file descriptors for loaded devices will be reattached later. */ | |
338 | k = session_device_new(s, dev, false, &sd); | |
339 | if (k < 0) | |
340 | r = k; | |
341 | } | |
342 | ||
343 | if (r < 0) | |
344 | log_error_errno(r, "Loading session devices for session %s failed: %m", s->id); | |
345 | ||
346 | return r; | |
347 | } | |
dacd6cee | 348 | |
20263082 | 349 | int session_load(Session *s) { |
9444b1f2 | 350 | _cleanup_free_ char *remote = NULL, |
a185c5aa LP |
351 | *seat = NULL, |
352 | *vtnr = NULL, | |
be94d954 | 353 | *state = NULL, |
e6494a07 | 354 | *position = NULL, |
a185c5aa | 355 | *leader = NULL, |
55efac6c | 356 | *type = NULL, |
9444b1f2 LP |
357 | *class = NULL, |
358 | *uid = NULL, | |
359 | *realtime = NULL, | |
6d33772f | 360 | *monotonic = NULL, |
aed24c4c FB |
361 | *controller = NULL, |
362 | *active = NULL, | |
363 | *devices = NULL; | |
a185c5aa LP |
364 | |
365 | int k, r; | |
366 | ||
20263082 LP |
367 | assert(s); |
368 | ||
a185c5aa LP |
369 | r = parse_env_file(s->state_file, NEWLINE, |
370 | "REMOTE", &remote, | |
fb6becb4 LP |
371 | "SCOPE", &s->scope, |
372 | "SCOPE_JOB", &s->scope_job, | |
932e3ee7 | 373 | "FIFO", &s->fifo_path, |
a185c5aa LP |
374 | "SEAT", &seat, |
375 | "TTY", &s->tty, | |
376 | "DISPLAY", &s->display, | |
377 | "REMOTE_HOST", &s->remote_host, | |
378 | "REMOTE_USER", &s->remote_user, | |
98a28fef | 379 | "SERVICE", &s->service, |
a4cd87e9 | 380 | "DESKTOP", &s->desktop, |
a185c5aa | 381 | "VTNR", &vtnr, |
be94d954 | 382 | "STATE", &state, |
e6494a07 | 383 | "POSITION", &position, |
a185c5aa | 384 | "LEADER", &leader, |
a91e4e53 | 385 | "TYPE", &type, |
55efac6c | 386 | "CLASS", &class, |
9444b1f2 LP |
387 | "UID", &uid, |
388 | "REALTIME", &realtime, | |
389 | "MONOTONIC", &monotonic, | |
6d33772f | 390 | "CONTROLLER", &controller, |
aed24c4c FB |
391 | "ACTIVE", &active, |
392 | "DEVICES", &devices, | |
a185c5aa LP |
393 | NULL); |
394 | ||
f647962d MS |
395 | if (r < 0) |
396 | return log_error_errno(r, "Failed to read %s: %m", s->state_file); | |
9444b1f2 LP |
397 | |
398 | if (!s->user) { | |
399 | uid_t u; | |
400 | User *user; | |
401 | ||
402 | if (!uid) { | |
403 | log_error("UID not specified for session %s", s->id); | |
404 | return -ENOENT; | |
405 | } | |
406 | ||
407 | r = parse_uid(uid, &u); | |
408 | if (r < 0) { | |
409 | log_error("Failed to parse UID value %s for session %s.", uid, s->id); | |
410 | return r; | |
411 | } | |
412 | ||
8cb4ab00 | 413 | user = hashmap_get(s->manager->users, UID_TO_PTR(u)); |
9444b1f2 LP |
414 | if (!user) { |
415 | log_error("User of session %s not known.", s->id); | |
416 | return -ENOENT; | |
417 | } | |
418 | ||
419 | session_set_user(s, user); | |
420 | } | |
a185c5aa LP |
421 | |
422 | if (remote) { | |
423 | k = parse_boolean(remote); | |
424 | if (k >= 0) | |
425 | s->remote = k; | |
426 | } | |
427 | ||
c506027a DH |
428 | if (vtnr) |
429 | safe_atou(vtnr, &s->vtnr); | |
430 | ||
9418f147 | 431 | if (seat && !s->seat) { |
a185c5aa LP |
432 | Seat *o; |
433 | ||
434 | o = hashmap_get(s->manager->seats, seat); | |
435 | if (o) | |
c506027a DH |
436 | r = seat_attach_session(o, s); |
437 | if (!o || r < 0) | |
438 | log_error("Cannot attach session %s to seat %s", s->id, seat); | |
a185c5aa LP |
439 | } |
440 | ||
c506027a DH |
441 | if (!s->seat || !seat_has_vts(s->seat)) |
442 | s->vtnr = 0; | |
a185c5aa | 443 | |
e6494a07 | 444 | if (position && s->seat) { |
49e6fdbf DH |
445 | unsigned int npos; |
446 | ||
e6494a07 | 447 | safe_atou(position, &npos); |
49e6fdbf DH |
448 | seat_claim_position(s->seat, s, npos); |
449 | } | |
450 | ||
a185c5aa | 451 | if (leader) { |
3a87a86e LP |
452 | if (parse_pid(leader, &s->leader) >= 0) |
453 | (void) audit_session_from_pid(s->leader, &s->audit_id); | |
a185c5aa LP |
454 | } |
455 | ||
a91e4e53 LP |
456 | if (type) { |
457 | SessionType t; | |
458 | ||
459 | t = session_type_from_string(type); | |
460 | if (t >= 0) | |
461 | s->type = t; | |
462 | } | |
463 | ||
55efac6c LP |
464 | if (class) { |
465 | SessionClass c; | |
466 | ||
467 | c = session_class_from_string(class); | |
468 | if (c >= 0) | |
469 | s->class = c; | |
470 | } | |
471 | ||
be94d954 MP |
472 | if (state && streq(state, "closing")) |
473 | s->stopping = true; | |
474 | ||
b4f78aea LP |
475 | if (s->fifo_path) { |
476 | int fd; | |
477 | ||
478 | /* If we open an unopened pipe for reading we will not | |
479 | get an EOF. to trigger an EOF we hence open it for | |
be94d954 MP |
480 | writing, but close it right away which then will |
481 | trigger the EOF. This will happen immediately if no | |
482 | other process has the FIFO open for writing, i. e. | |
483 | when the session died before logind (re)started. */ | |
b4f78aea LP |
484 | |
485 | fd = session_create_fifo(s); | |
03e334a1 | 486 | safe_close(fd); |
b4f78aea LP |
487 | } |
488 | ||
b895a735 BR |
489 | if (realtime) |
490 | timestamp_deserialize(realtime, &s->timestamp.realtime); | |
491 | if (monotonic) | |
492 | timestamp_deserialize(monotonic, &s->timestamp.monotonic); | |
a185c5aa | 493 | |
aed24c4c FB |
494 | if (active) { |
495 | k = parse_boolean(active); | |
496 | if (k >= 0) | |
497 | s->was_active = k; | |
498 | } | |
499 | ||
6d33772f | 500 | if (controller) { |
aed24c4c | 501 | if (bus_name_has_owner(s->manager->bus, controller, NULL) > 0) { |
dc6284e9 | 502 | session_set_controller(s, controller, false, false); |
aed24c4c FB |
503 | session_load_devices(s, devices); |
504 | } else | |
90a18413 | 505 | session_restore_vt(s); |
6d33772f DH |
506 | } |
507 | ||
a185c5aa | 508 | return r; |
20263082 LP |
509 | } |
510 | ||
511 | int session_activate(Session *s) { | |
d7bd01b5 DH |
512 | unsigned int num_pending; |
513 | ||
20263082 | 514 | assert(s); |
9444b1f2 | 515 | assert(s->user); |
20263082 | 516 | |
20263082 | 517 | if (!s->seat) |
15411c0c | 518 | return -EOPNOTSUPP; |
20263082 LP |
519 | |
520 | if (s->seat->active == s) | |
521 | return 0; | |
522 | ||
d7bd01b5 DH |
523 | /* on seats with VTs, we let VTs manage session-switching */ |
524 | if (seat_has_vts(s->seat)) { | |
92bd5ff3 | 525 | if (!s->vtnr) |
15411c0c | 526 | return -EOPNOTSUPP; |
d7bd01b5 DH |
527 | |
528 | return chvt(s->vtnr); | |
529 | } | |
530 | ||
531 | /* On seats without VTs, we implement session-switching in logind. We | |
532 | * try to pause all session-devices and wait until the session | |
533 | * controller acknowledged them. Once all devices are asleep, we simply | |
534 | * switch the active session and be done. | |
535 | * We save the session we want to switch to in seat->pending_switch and | |
536 | * seat_complete_switch() will perform the final switch. */ | |
537 | ||
538 | s->seat->pending_switch = s; | |
539 | ||
540 | /* if no devices are running, immediately perform the session switch */ | |
541 | num_pending = session_device_try_pause_all(s); | |
542 | if (!num_pending) | |
543 | seat_complete_switch(s->seat); | |
20263082 | 544 | |
d7bd01b5 | 545 | return 0; |
20263082 LP |
546 | } |
547 | ||
22f93314 | 548 | static int session_start_scope(Session *s, sd_bus_message *properties) { |
98a28fef LP |
549 | int r; |
550 | ||
551 | assert(s); | |
9444b1f2 | 552 | assert(s->user); |
98a28fef | 553 | |
fb6becb4 | 554 | if (!s->scope) { |
4afd3348 | 555 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; |
39883f62 | 556 | char *scope, *job = NULL; |
90558f31 | 557 | const char *description; |
405e0255 | 558 | |
605405c6 | 559 | scope = strjoin("session-", s->id, ".scope"); |
d0af76e6 | 560 | if (!scope) |
ae018d9b LP |
561 | return log_oom(); |
562 | ||
81d62103 | 563 | description = strjoina("Session ", s->id, " of user ", s->user->name); |
90558f31 LP |
564 | |
565 | r = manager_start_scope( | |
566 | s->manager, | |
567 | scope, | |
568 | s->leader, | |
569 | s->user->slice, | |
570 | description, | |
571 | "systemd-logind.service", | |
572 | "systemd-user-sessions.service", | |
22f93314 | 573 | properties, |
90558f31 LP |
574 | &error, |
575 | &job); | |
d0af76e6 | 576 | if (r < 0) { |
90558f31 | 577 | log_error_errno(r, "Failed to start session scope %s: %s", scope, bus_error_message(&error, r)); |
d0af76e6 | 578 | free(scope); |
f2d4f98d | 579 | return r; |
d0af76e6 LP |
580 | } else { |
581 | s->scope = scope; | |
582 | ||
583 | free(s->scope_job); | |
584 | s->scope_job = job; | |
585 | } | |
20263082 LP |
586 | } |
587 | ||
d0af76e6 | 588 | if (s->scope) |
90558f31 | 589 | (void) hashmap_put(s->manager->session_units, s->scope, s); |
d0af76e6 | 590 | |
20263082 LP |
591 | return 0; |
592 | } | |
593 | ||
22f93314 | 594 | int session_start(Session *s, sd_bus_message *properties) { |
20263082 LP |
595 | int r; |
596 | ||
597 | assert(s); | |
9444b1f2 LP |
598 | |
599 | if (!s->user) | |
600 | return -ESTALE; | |
20263082 | 601 | |
9418f147 LP |
602 | if (s->started) |
603 | return 0; | |
604 | ||
ed18b08b LP |
605 | r = user_start(s->user); |
606 | if (r < 0) | |
607 | return r; | |
608 | ||
fb6becb4 | 609 | /* Create cgroup */ |
22f93314 | 610 | r = session_start_scope(s, properties); |
fb6becb4 LP |
611 | if (r < 0) |
612 | return r; | |
613 | ||
d9eb81f9 | 614 | log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO, |
2b044526 | 615 | "MESSAGE_ID=" SD_MESSAGE_SESSION_START_STR, |
877d54e9 LP |
616 | "SESSION_ID=%s", s->id, |
617 | "USER_ID=%s", s->user->name, | |
de0671ee | 618 | "LEADER="PID_FMT, s->leader, |
e2cc6eca | 619 | LOG_MESSAGE("New session %s of user %s.", s->id, s->user->name), |
877d54e9 | 620 | NULL); |
98a28fef | 621 | |
9444b1f2 LP |
622 | if (!dual_timestamp_is_set(&s->timestamp)) |
623 | dual_timestamp_get(&s->timestamp); | |
14c3baca | 624 | |
e9816c48 LP |
625 | if (s->seat) |
626 | seat_read_active_vt(s->seat); | |
627 | ||
9418f147 LP |
628 | s->started = true; |
629 | ||
952d3260 LP |
630 | user_elect_display(s->user); |
631 | ||
5f41d1f1 | 632 | /* Save data */ |
e9816c48 | 633 | session_save(s); |
7f7bb946 | 634 | user_save(s->user); |
5f41d1f1 LP |
635 | if (s->seat) |
636 | seat_save(s->seat); | |
e9816c48 | 637 | |
5f41d1f1 | 638 | /* Send signals */ |
da119395 | 639 | session_send_signal(s, true); |
7d049e30 | 640 | user_send_changed(s->user, "Display", NULL); |
9418f147 LP |
641 | if (s->seat) { |
642 | if (s->seat->active == s) | |
7d049e30 | 643 | seat_send_changed(s->seat, "ActiveSession", NULL); |
9418f147 LP |
644 | } |
645 | ||
20263082 LP |
646 | return 0; |
647 | } | |
648 | ||
9bb69af4 | 649 | static int session_stop_scope(Session *s, bool force) { |
4afd3348 | 650 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; |
20263082 | 651 | int r; |
20263082 LP |
652 | |
653 | assert(s); | |
654 | ||
fb6becb4 LP |
655 | if (!s->scope) |
656 | return 0; | |
9b221b63 | 657 | |
756ed0e2 | 658 | /* Let's always abandon the scope first. This tells systemd that we are not interested anymore, and everything |
629ff674 | 659 | * that is left in the scope is "left-over". Informing systemd about this has the benefit that it will log |
756ed0e2 LP |
660 | * when killing any processes left after this point. */ |
661 | r = manager_abandon_scope(s->manager, s->scope, &error); | |
662 | if (r < 0) | |
663 | log_warning_errno(r, "Failed to abandon session scope, ignoring: %s", bus_error_message(&error, r)); | |
664 | ||
665 | /* Optionally, let's kill everything that's left now. */ | |
9bb69af4 | 666 | if (force || manager_shall_kill(s->manager, s->user->name)) { |
801a884d LP |
667 | char *job = NULL; |
668 | ||
5f41d1f1 | 669 | r = manager_stop_unit(s->manager, s->scope, &error, &job); |
801a884d LP |
670 | if (r < 0) |
671 | return log_error_errno(r, "Failed to stop session scope: %s", bus_error_message(&error, r)); | |
20263082 | 672 | |
5f41d1f1 LP |
673 | free(s->scope_job); |
674 | s->scope_job = job; | |
756ed0e2 LP |
675 | } else |
676 | s->scope_job = mfree(s->scope_job); | |
20263082 | 677 | |
9b221b63 | 678 | return 0; |
20263082 LP |
679 | } |
680 | ||
9bb69af4 | 681 | int session_stop(Session *s, bool force) { |
405e0255 LP |
682 | int r; |
683 | ||
684 | assert(s); | |
685 | ||
686 | if (!s->user) | |
687 | return -ESTALE; | |
688 | ||
5f41d1f1 LP |
689 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
690 | ||
10189fd6 DH |
691 | if (s->seat) |
692 | seat_evict_position(s->seat, s); | |
693 | ||
5f41d1f1 LP |
694 | /* We are going down, don't care about FIFOs anymore */ |
695 | session_remove_fifo(s); | |
696 | ||
405e0255 | 697 | /* Kill cgroup */ |
9bb69af4 | 698 | r = session_stop_scope(s, force); |
405e0255 | 699 | |
5f41d1f1 LP |
700 | s->stopping = true; |
701 | ||
952d3260 LP |
702 | user_elect_display(s->user); |
703 | ||
405e0255 | 704 | session_save(s); |
cc377381 | 705 | user_save(s->user); |
405e0255 LP |
706 | |
707 | return r; | |
708 | } | |
709 | ||
710 | int session_finalize(Session *s) { | |
118ecf32 | 711 | SessionDevice *sd; |
20263082 LP |
712 | |
713 | assert(s); | |
714 | ||
9444b1f2 LP |
715 | if (!s->user) |
716 | return -ESTALE; | |
717 | ||
ed18b08b | 718 | if (s->started) |
d9eb81f9 | 719 | log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO, |
2b044526 | 720 | "MESSAGE_ID=" SD_MESSAGE_SESSION_STOP_STR, |
877d54e9 LP |
721 | "SESSION_ID=%s", s->id, |
722 | "USER_ID=%s", s->user->name, | |
de0671ee | 723 | "LEADER="PID_FMT, s->leader, |
e2cc6eca | 724 | LOG_MESSAGE("Removed session %s.", s->id), |
877d54e9 | 725 | NULL); |
98a28fef | 726 | |
5f41d1f1 LP |
727 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
728 | ||
10189fd6 DH |
729 | if (s->seat) |
730 | seat_evict_position(s->seat, s); | |
731 | ||
118ecf32 DH |
732 | /* Kill session devices */ |
733 | while ((sd = hashmap_first(s->devices))) | |
734 | session_device_free(sd); | |
735 | ||
491ac9f2 | 736 | (void) unlink(s->state_file); |
d2f92cdf | 737 | session_add_to_gc_queue(s); |
ed18b08b | 738 | user_add_to_gc_queue(s->user); |
14c3baca | 739 | |
405e0255 | 740 | if (s->started) { |
ed18b08b | 741 | session_send_signal(s, false); |
405e0255 LP |
742 | s->started = false; |
743 | } | |
50fb9793 | 744 | |
9418f147 LP |
745 | if (s->seat) { |
746 | if (s->seat->active == s) | |
747 | seat_set_active(s->seat, NULL); | |
748 | ||
23bd3b62 | 749 | seat_save(s->seat); |
9418f147 LP |
750 | } |
751 | ||
23bd3b62 | 752 | user_save(s->user); |
7d049e30 | 753 | user_send_changed(s->user, "Display", NULL); |
9418f147 | 754 | |
491ac9f2 | 755 | return 0; |
20263082 LP |
756 | } |
757 | ||
5f41d1f1 LP |
758 | static int release_timeout_callback(sd_event_source *es, uint64_t usec, void *userdata) { |
759 | Session *s = userdata; | |
760 | ||
761 | assert(es); | |
762 | assert(s); | |
763 | ||
9bb69af4 | 764 | session_stop(s, false); |
5f41d1f1 LP |
765 | return 0; |
766 | } | |
767 | ||
ad8780c9 | 768 | int session_release(Session *s) { |
5f41d1f1 LP |
769 | assert(s); |
770 | ||
771 | if (!s->started || s->stopping) | |
ad8780c9 ZJS |
772 | return 0; |
773 | ||
774 | if (s->timer_event_source) | |
775 | return 0; | |
776 | ||
777 | return sd_event_add_time(s->manager->event, | |
778 | &s->timer_event_source, | |
779 | CLOCK_MONOTONIC, | |
780 | now(CLOCK_MONOTONIC) + RELEASE_USEC, 0, | |
781 | release_timeout_callback, s); | |
5f41d1f1 LP |
782 | } |
783 | ||
20263082 LP |
784 | bool session_is_active(Session *s) { |
785 | assert(s); | |
786 | ||
787 | if (!s->seat) | |
788 | return true; | |
789 | ||
790 | return s->seat->active == s; | |
791 | } | |
792 | ||
23406ce5 LP |
793 | static int get_tty_atime(const char *tty, usec_t *atime) { |
794 | _cleanup_free_ char *p = NULL; | |
a185c5aa | 795 | struct stat st; |
23406ce5 LP |
796 | |
797 | assert(tty); | |
798 | assert(atime); | |
799 | ||
800 | if (!path_is_absolute(tty)) { | |
801 | p = strappend("/dev/", tty); | |
802 | if (!p) | |
803 | return -ENOMEM; | |
804 | ||
805 | tty = p; | |
806 | } else if (!path_startswith(tty, "/dev/")) | |
807 | return -ENOENT; | |
808 | ||
809 | if (lstat(tty, &st) < 0) | |
810 | return -errno; | |
811 | ||
812 | *atime = timespec_load(&st.st_atim); | |
813 | return 0; | |
814 | } | |
815 | ||
816 | static int get_process_ctty_atime(pid_t pid, usec_t *atime) { | |
817 | _cleanup_free_ char *p = NULL; | |
818 | int r; | |
819 | ||
820 | assert(pid > 0); | |
821 | assert(atime); | |
822 | ||
823 | r = get_ctty(pid, NULL, &p); | |
824 | if (r < 0) | |
825 | return r; | |
826 | ||
827 | return get_tty_atime(p, atime); | |
828 | } | |
829 | ||
830 | int session_get_idle_hint(Session *s, dual_timestamp *t) { | |
23406ce5 LP |
831 | usec_t atime = 0, n; |
832 | int r; | |
a185c5aa LP |
833 | |
834 | assert(s); | |
835 | ||
23406ce5 | 836 | /* Explicit idle hint is set */ |
a185c5aa LP |
837 | if (s->idle_hint) { |
838 | if (t) | |
839 | *t = s->idle_hint_timestamp; | |
840 | ||
841 | return s->idle_hint; | |
842 | } | |
843 | ||
0762eaa3 | 844 | /* Graphical sessions should really implement a real |
23406ce5 | 845 | * idle hint logic */ |
129baf1b | 846 | if (SESSION_TYPE_IS_GRAPHICAL(s->type)) |
a185c5aa LP |
847 | goto dont_know; |
848 | ||
23406ce5 LP |
849 | /* For sessions with an explicitly configured tty, let's check |
850 | * its atime */ | |
851 | if (s->tty) { | |
852 | r = get_tty_atime(s->tty, &atime); | |
853 | if (r >= 0) | |
854 | goto found_atime; | |
855 | } | |
a185c5aa | 856 | |
23406ce5 LP |
857 | /* For sessions with a leader but no explicitly configured |
858 | * tty, let's check the controlling tty of the leader */ | |
859 | if (s->leader > 0) { | |
860 | r = get_process_ctty_atime(s->leader, &atime); | |
861 | if (r >= 0) | |
862 | goto found_atime; | |
a185c5aa LP |
863 | } |
864 | ||
a185c5aa LP |
865 | dont_know: |
866 | if (t) | |
867 | *t = s->idle_hint_timestamp; | |
868 | ||
869 | return 0; | |
23406ce5 LP |
870 | |
871 | found_atime: | |
872 | if (t) | |
873 | dual_timestamp_from_realtime(t, atime); | |
874 | ||
875 | n = now(CLOCK_REALTIME); | |
876 | ||
877 | if (s->manager->idle_action_usec <= 0) | |
878 | return 0; | |
879 | ||
880 | return atime + s->manager->idle_action_usec <= n; | |
a185c5aa LP |
881 | } |
882 | ||
bef422ae LP |
883 | void session_set_idle_hint(Session *s, bool b) { |
884 | assert(s); | |
885 | ||
886 | if (s->idle_hint == b) | |
887 | return; | |
888 | ||
889 | s->idle_hint = b; | |
890 | dual_timestamp_get(&s->idle_hint_timestamp); | |
9418f147 | 891 | |
cc377381 | 892 | session_send_changed(s, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); |
9418f147 LP |
893 | |
894 | if (s->seat) | |
cc377381 LP |
895 | seat_send_changed(s->seat, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); |
896 | ||
897 | user_send_changed(s->user, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); | |
898 | manager_send_changed(s->manager, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); | |
899 | } | |
900 | ||
42d35e13 VT |
901 | int session_get_locked_hint(Session *s) { |
902 | assert(s); | |
903 | ||
904 | return s->locked_hint; | |
905 | } | |
906 | ||
907 | void session_set_locked_hint(Session *s, bool b) { | |
908 | assert(s); | |
909 | ||
910 | if (s->locked_hint == b) | |
911 | return; | |
912 | ||
913 | s->locked_hint = b; | |
914 | ||
915 | session_send_changed(s, "LockedHint", NULL); | |
916 | } | |
917 | ||
cc377381 LP |
918 | static int session_dispatch_fifo(sd_event_source *es, int fd, uint32_t revents, void *userdata) { |
919 | Session *s = userdata; | |
920 | ||
921 | assert(s); | |
922 | assert(s->fifo_fd == fd); | |
923 | ||
924 | /* EOF on the FIFO means the session died abnormally. */ | |
925 | ||
926 | session_remove_fifo(s); | |
9bb69af4 | 927 | session_stop(s, false); |
cc377381 LP |
928 | |
929 | return 1; | |
bef422ae LP |
930 | } |
931 | ||
932e3ee7 LP |
932 | int session_create_fifo(Session *s) { |
933 | int r; | |
934 | ||
31b79c2b LP |
935 | assert(s); |
936 | ||
b4f78aea | 937 | /* Create FIFO */ |
932e3ee7 | 938 | if (!s->fifo_path) { |
37c1d5e9 | 939 | r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0, MKDIR_WARN_MODE); |
e6061ab2 LP |
940 | if (r < 0) |
941 | return r; | |
942 | ||
932e3ee7 LP |
943 | if (asprintf(&s->fifo_path, "/run/systemd/sessions/%s.ref", s->id) < 0) |
944 | return -ENOMEM; | |
31b79c2b | 945 | |
932e3ee7 LP |
946 | if (mkfifo(s->fifo_path, 0600) < 0 && errno != EEXIST) |
947 | return -errno; | |
948 | } | |
31b79c2b | 949 | |
932e3ee7 | 950 | /* Open reading side */ |
b4f78aea | 951 | if (s->fifo_fd < 0) { |
db4a47e9 | 952 | s->fifo_fd = open(s->fifo_path, O_RDONLY|O_CLOEXEC|O_NONBLOCK); |
b4f78aea LP |
953 | if (s->fifo_fd < 0) |
954 | return -errno; | |
955 | ||
cc377381 LP |
956 | } |
957 | ||
958 | if (!s->fifo_event_source) { | |
151b9b96 | 959 | r = sd_event_add_io(s->manager->event, &s->fifo_event_source, s->fifo_fd, 0, session_dispatch_fifo, s); |
b4f78aea LP |
960 | if (r < 0) |
961 | return r; | |
962 | ||
e11544a8 LP |
963 | /* Let's make sure we noticed dead sessions before we process new bus requests (which might create new |
964 | * sessions). */ | |
965 | r = sd_event_source_set_priority(s->fifo_event_source, SD_EVENT_PRIORITY_NORMAL-10); | |
cc377381 LP |
966 | if (r < 0) |
967 | return r; | |
b4f78aea | 968 | } |
932e3ee7 LP |
969 | |
970 | /* Open writing side */ | |
db4a47e9 | 971 | r = open(s->fifo_path, O_WRONLY|O_CLOEXEC|O_NONBLOCK); |
932e3ee7 LP |
972 | if (r < 0) |
973 | return -errno; | |
31b79c2b | 974 | |
932e3ee7 LP |
975 | return r; |
976 | } | |
977 | ||
5f41d1f1 | 978 | static void session_remove_fifo(Session *s) { |
932e3ee7 LP |
979 | assert(s); |
980 | ||
03e334a1 LP |
981 | s->fifo_event_source = sd_event_source_unref(s->fifo_event_source); |
982 | s->fifo_fd = safe_close(s->fifo_fd); | |
932e3ee7 LP |
983 | |
984 | if (s->fifo_path) { | |
985 | unlink(s->fifo_path); | |
a1e58e8e | 986 | s->fifo_path = mfree(s->fifo_path); |
932e3ee7 | 987 | } |
31b79c2b LP |
988 | } |
989 | ||
5c093a23 | 990 | bool session_may_gc(Session *s, bool drop_not_started) { |
20263082 LP |
991 | assert(s); |
992 | ||
4a4b033f | 993 | if (drop_not_started && !s->started) |
5c093a23 | 994 | return true; |
932e3ee7 | 995 | |
9444b1f2 | 996 | if (!s->user) |
5c093a23 | 997 | return true; |
9444b1f2 | 998 | |
932e3ee7 | 999 | if (s->fifo_fd >= 0) { |
5f41d1f1 | 1000 | if (pipe_eof(s->fifo_fd) <= 0) |
5c093a23 | 1001 | return false; |
20263082 LP |
1002 | } |
1003 | ||
cc377381 | 1004 | if (s->scope_job && manager_job_is_active(s->manager, s->scope_job)) |
5c093a23 | 1005 | return false; |
20263082 | 1006 | |
cc377381 | 1007 | if (s->scope && manager_unit_is_active(s->manager, s->scope)) |
5c093a23 | 1008 | return false; |
20263082 | 1009 | |
5c093a23 | 1010 | return true; |
20263082 LP |
1011 | } |
1012 | ||
14c3baca LP |
1013 | void session_add_to_gc_queue(Session *s) { |
1014 | assert(s); | |
1015 | ||
1016 | if (s->in_gc_queue) | |
1017 | return; | |
1018 | ||
71fda00f | 1019 | LIST_PREPEND(gc_queue, s->manager->session_gc_queue, s); |
14c3baca LP |
1020 | s->in_gc_queue = true; |
1021 | } | |
1022 | ||
0604381b LP |
1023 | SessionState session_get_state(Session *s) { |
1024 | assert(s); | |
1025 | ||
8fe63cd4 | 1026 | /* always check closing first */ |
5f41d1f1 LP |
1027 | if (s->stopping || s->timer_event_source) |
1028 | return SESSION_CLOSING; | |
1029 | ||
8fe63cd4 | 1030 | if (s->scope_job || s->fifo_fd < 0) |
405e0255 | 1031 | return SESSION_OPENING; |
fb6becb4 | 1032 | |
0604381b LP |
1033 | if (session_is_active(s)) |
1034 | return SESSION_ACTIVE; | |
1035 | ||
1036 | return SESSION_ONLINE; | |
1037 | } | |
1038 | ||
de07ab16 | 1039 | int session_kill(Session *s, KillWho who, int signo) { |
de07ab16 LP |
1040 | assert(s); |
1041 | ||
fb6becb4 | 1042 | if (!s->scope) |
de07ab16 LP |
1043 | return -ESRCH; |
1044 | ||
fb6becb4 | 1045 | return manager_kill_unit(s->manager, s->scope, who, signo, NULL); |
de07ab16 LP |
1046 | } |
1047 | ||
90a18413 | 1048 | static int session_open_vt(Session *s) { |
5f41d1f1 | 1049 | char path[sizeof("/dev/tty") + DECIMAL_STR_MAX(s->vtnr)]; |
90a18413 | 1050 | |
baccf3e4 OB |
1051 | if (s->vtnr < 1) |
1052 | return -ENODEV; | |
90a18413 DH |
1053 | |
1054 | if (s->vtfd >= 0) | |
1055 | return s->vtfd; | |
1056 | ||
92bd5ff3 | 1057 | sprintf(path, "/dev/tty%u", s->vtnr); |
22356953 | 1058 | s->vtfd = open_terminal(path, O_RDWR | O_CLOEXEC | O_NONBLOCK | O_NOCTTY); |
4a62c710 | 1059 | if (s->vtfd < 0) |
709f6e46 | 1060 | return log_error_errno(s->vtfd, "cannot open VT %s of session %s: %m", path, s->id); |
90a18413 DH |
1061 | |
1062 | return s->vtfd; | |
1063 | } | |
1064 | ||
baccf3e4 | 1065 | int session_prepare_vt(Session *s) { |
90a18413 DH |
1066 | int vt, r; |
1067 | struct vt_mode mode = { 0 }; | |
90a18413 | 1068 | |
baccf3e4 OB |
1069 | if (s->vtnr < 1) |
1070 | return 0; | |
1071 | ||
90a18413 DH |
1072 | vt = session_open_vt(s); |
1073 | if (vt < 0) | |
baccf3e4 | 1074 | return vt; |
90a18413 | 1075 | |
d6176c6c | 1076 | r = fchown(vt, s->user->uid, -1); |
baccf3e4 | 1077 | if (r < 0) { |
94c156cd LP |
1078 | r = log_error_errno(errno, |
1079 | "Cannot change owner of /dev/tty%u: %m", | |
1080 | s->vtnr); | |
d6176c6c | 1081 | goto error; |
baccf3e4 | 1082 | } |
d6176c6c | 1083 | |
90a18413 | 1084 | r = ioctl(vt, KDSKBMODE, K_OFF); |
baccf3e4 | 1085 | if (r < 0) { |
94c156cd LP |
1086 | r = log_error_errno(errno, |
1087 | "Cannot set K_OFF on /dev/tty%u: %m", | |
1088 | s->vtnr); | |
90a18413 | 1089 | goto error; |
baccf3e4 | 1090 | } |
90a18413 DH |
1091 | |
1092 | r = ioctl(vt, KDSETMODE, KD_GRAPHICS); | |
baccf3e4 | 1093 | if (r < 0) { |
94c156cd LP |
1094 | r = log_error_errno(errno, |
1095 | "Cannot set KD_GRAPHICS on /dev/tty%u: %m", | |
1096 | s->vtnr); | |
90a18413 | 1097 | goto error; |
baccf3e4 | 1098 | } |
90a18413 | 1099 | |
90a18413 DH |
1100 | /* Oh, thanks to the VT layer, VT_AUTO does not work with KD_GRAPHICS. |
1101 | * So we need a dummy handler here which just acknowledges *all* VT | |
1102 | * switch requests. */ | |
1103 | mode.mode = VT_PROCESS; | |
92683ad2 DH |
1104 | mode.relsig = SIGRTMIN; |
1105 | mode.acqsig = SIGRTMIN + 1; | |
90a18413 | 1106 | r = ioctl(vt, VT_SETMODE, &mode); |
baccf3e4 | 1107 | if (r < 0) { |
94c156cd LP |
1108 | r = log_error_errno(errno, |
1109 | "Cannot set VT_PROCESS on /dev/tty%u: %m", | |
1110 | s->vtnr); | |
90a18413 | 1111 | goto error; |
baccf3e4 | 1112 | } |
90a18413 | 1113 | |
baccf3e4 | 1114 | return 0; |
90a18413 DH |
1115 | |
1116 | error: | |
90a18413 | 1117 | session_restore_vt(s); |
baccf3e4 | 1118 | return r; |
90a18413 DH |
1119 | } |
1120 | ||
1121 | void session_restore_vt(Session *s) { | |
16597ac3 LP |
1122 | |
1123 | static const struct vt_mode mode = { | |
1124 | .mode = VT_AUTO, | |
1125 | }; | |
1126 | ||
c83f349c | 1127 | int vt, old_fd; |
90a18413 | 1128 | |
128df4cf OT |
1129 | /* We need to get a fresh handle to the virtual terminal, |
1130 | * since the old file-descriptor is potentially in a hung-up | |
1131 | * state after the controlling process exited; we do a | |
1132 | * little dance to avoid having the terminal be available | |
1133 | * for reuse before we've cleaned it up. | |
1134 | */ | |
c10d6bdb | 1135 | old_fd = TAKE_FD(s->vtfd); |
128df4cf | 1136 | |
90a18413 | 1137 | vt = session_open_vt(s); |
128df4cf OT |
1138 | safe_close(old_fd); |
1139 | ||
90a18413 DH |
1140 | if (vt < 0) |
1141 | return; | |
1142 | ||
2bf10523 | 1143 | (void) ioctl(vt, KDSETMODE, KD_TEXT); |
90a18413 | 1144 | |
c83f349c | 1145 | (void) vt_reset_keyboard(vt); |
90a18413 | 1146 | |
2bf10523 | 1147 | (void) ioctl(vt, VT_SETMODE, &mode); |
16597ac3 | 1148 | (void) fchown(vt, 0, (gid_t) -1); |
d6176c6c | 1149 | |
03e334a1 | 1150 | s->vtfd = safe_close(s->vtfd); |
90a18413 DH |
1151 | } |
1152 | ||
2ec3ff66 | 1153 | void session_leave_vt(Session *s) { |
ce540a24 DH |
1154 | int r; |
1155 | ||
2ec3ff66 DH |
1156 | assert(s); |
1157 | ||
1158 | /* This is called whenever we get a VT-switch signal from the kernel. | |
1159 | * We acknowledge all of them unconditionally. Note that session are | |
1160 | * free to overwrite those handlers and we only register them for | |
1161 | * sessions with controllers. Legacy sessions are not affected. | |
1162 | * However, if we switch from a non-legacy to a legacy session, we must | |
1163 | * make sure to pause all device before acknowledging the switch. We | |
1164 | * process the real switch only after we are notified via sysfs, so the | |
1165 | * legacy session might have already started using the devices. If we | |
1166 | * don't pause the devices before the switch, we might confuse the | |
1167 | * session we switch to. */ | |
1168 | ||
1169 | if (s->vtfd < 0) | |
1170 | return; | |
1171 | ||
1172 | session_device_pause_all(s); | |
ce540a24 DH |
1173 | r = ioctl(s->vtfd, VT_RELDISP, 1); |
1174 | if (r < 0) | |
56f64d95 | 1175 | log_debug_errno(errno, "Cannot release VT of session %s: %m", s->id); |
2ec3ff66 DH |
1176 | } |
1177 | ||
cc377381 | 1178 | bool session_is_controller(Session *s, const char *sender) { |
ae5e06bd DH |
1179 | assert(s); |
1180 | ||
1181 | return streq_ptr(s->controller, sender); | |
1182 | } | |
1183 | ||
b12e5615 DH |
1184 | static void session_release_controller(Session *s, bool notify) { |
1185 | _cleanup_free_ char *name = NULL; | |
6d33772f DH |
1186 | SessionDevice *sd; |
1187 | ||
b12e5615 DH |
1188 | if (!s->controller) |
1189 | return; | |
6d33772f | 1190 | |
b12e5615 | 1191 | name = s->controller; |
90a18413 | 1192 | |
b12e5615 DH |
1193 | /* By resetting the controller before releasing the devices, we won't |
1194 | * send notification signals. This avoids sending useless notifications | |
1195 | * if the controller is released on disconnects. */ | |
1196 | if (!notify) | |
1197 | s->controller = NULL; | |
6d33772f | 1198 | |
b12e5615 DH |
1199 | while ((sd = hashmap_first(s->devices))) |
1200 | session_device_free(sd); | |
1201 | ||
1202 | s->controller = NULL; | |
3cde9e8f DM |
1203 | s->track = sd_bus_track_unref(s->track); |
1204 | } | |
1205 | ||
1206 | static int on_bus_track(sd_bus_track *track, void *userdata) { | |
1207 | Session *s = userdata; | |
1208 | ||
1209 | assert(track); | |
1210 | assert(s); | |
1211 | ||
1212 | session_drop_controller(s); | |
1213 | ||
1214 | return 0; | |
6d33772f DH |
1215 | } |
1216 | ||
dc6284e9 | 1217 | int session_set_controller(Session *s, const char *sender, bool force, bool prepare) { |
b12e5615 | 1218 | _cleanup_free_ char *name = NULL; |
ae5e06bd DH |
1219 | int r; |
1220 | ||
1221 | assert(s); | |
1222 | assert(sender); | |
1223 | ||
1224 | if (session_is_controller(s, sender)) | |
1225 | return 0; | |
1226 | if (s->controller && !force) | |
1227 | return -EBUSY; | |
1228 | ||
b12e5615 DH |
1229 | name = strdup(sender); |
1230 | if (!name) | |
ae5e06bd DH |
1231 | return -ENOMEM; |
1232 | ||
3cde9e8f DM |
1233 | s->track = sd_bus_track_unref(s->track); |
1234 | r = sd_bus_track_new(s->manager->bus, &s->track, on_bus_track, s); | |
1235 | if (r < 0) | |
1236 | return r; | |
1237 | ||
1238 | r = sd_bus_track_add_name(s->track, name); | |
1239 | if (r < 0) | |
ae5e06bd | 1240 | return r; |
ae5e06bd | 1241 | |
90a18413 DH |
1242 | /* When setting a session controller, we forcibly mute the VT and set |
1243 | * it into graphics-mode. Applications can override that by changing | |
1244 | * VT state after calling TakeControl(). However, this serves as a good | |
1245 | * default and well-behaving controllers can now ignore VTs entirely. | |
1246 | * Note that we reset the VT on ReleaseControl() and if the controller | |
1247 | * exits. | |
1248 | * If logind crashes/restarts, we restore the controller during restart | |
dc6284e9 FB |
1249 | * (without preparing the VT since the controller has probably overridden |
1250 | * VT state by now) or reset the VT in case it crashed/exited, too. */ | |
1251 | if (prepare) { | |
1252 | r = session_prepare_vt(s); | |
1253 | if (r < 0) { | |
1254 | s->track = sd_bus_track_unref(s->track); | |
1255 | return r; | |
1256 | } | |
13f493dc | 1257 | } |
baccf3e4 | 1258 | |
b12e5615 | 1259 | session_release_controller(s, true); |
ae2a15bc | 1260 | s->controller = TAKE_PTR(name); |
b12e5615 | 1261 | session_save(s); |
90a18413 | 1262 | |
ae5e06bd DH |
1263 | return 0; |
1264 | } | |
1265 | ||
1266 | void session_drop_controller(Session *s) { | |
1267 | assert(s); | |
1268 | ||
1269 | if (!s->controller) | |
1270 | return; | |
1271 | ||
3cde9e8f | 1272 | s->track = sd_bus_track_unref(s->track); |
b12e5615 DH |
1273 | session_release_controller(s, false); |
1274 | session_save(s); | |
1275 | session_restore_vt(s); | |
ae5e06bd DH |
1276 | } |
1277 | ||
fb6becb4 LP |
1278 | static const char* const session_state_table[_SESSION_STATE_MAX] = { |
1279 | [SESSION_OPENING] = "opening", | |
0604381b LP |
1280 | [SESSION_ONLINE] = "online", |
1281 | [SESSION_ACTIVE] = "active", | |
1282 | [SESSION_CLOSING] = "closing" | |
1283 | }; | |
1284 | ||
1285 | DEFINE_STRING_TABLE_LOOKUP(session_state, SessionState); | |
1286 | ||
20263082 | 1287 | static const char* const session_type_table[_SESSION_TYPE_MAX] = { |
2c5859af | 1288 | [SESSION_UNSPECIFIED] = "unspecified", |
3f49d45a | 1289 | [SESSION_TTY] = "tty", |
98a28fef | 1290 | [SESSION_X11] = "x11", |
d9eb81f9 | 1291 | [SESSION_WAYLAND] = "wayland", |
9541666b | 1292 | [SESSION_MIR] = "mir", |
e9e74f28 | 1293 | [SESSION_WEB] = "web", |
20263082 LP |
1294 | }; |
1295 | ||
1296 | DEFINE_STRING_TABLE_LOOKUP(session_type, SessionType); | |
de07ab16 | 1297 | |
55efac6c LP |
1298 | static const char* const session_class_table[_SESSION_CLASS_MAX] = { |
1299 | [SESSION_USER] = "user", | |
1300 | [SESSION_GREETER] = "greeter", | |
e2acb67b LP |
1301 | [SESSION_LOCK_SCREEN] = "lock-screen", |
1302 | [SESSION_BACKGROUND] = "background" | |
55efac6c LP |
1303 | }; |
1304 | ||
1305 | DEFINE_STRING_TABLE_LOOKUP(session_class, SessionClass); | |
1306 | ||
de07ab16 LP |
1307 | static const char* const kill_who_table[_KILL_WHO_MAX] = { |
1308 | [KILL_LEADER] = "leader", | |
1309 | [KILL_ALL] = "all" | |
1310 | }; | |
1311 | ||
1312 | DEFINE_STRING_TABLE_LOOKUP(kill_who, KillWho); |