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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
20263082 LP |
2 | |
3 | #include <errno.h> | |
90a18413 | 4 | #include <fcntl.h> |
90a18413 | 5 | #include <linux/kd.h> |
4f5dd394 | 6 | #include <linux/vt.h> |
90a18413 | 7 | #include <signal.h> |
20263082 | 8 | #include <string.h> |
90a18413 | 9 | #include <sys/ioctl.h> |
20263082 LP |
10 | #include <unistd.h> |
11 | ||
cc377381 | 12 | #include "sd-messages.h" |
4f5dd394 | 13 | |
b5efdb8a | 14 | #include "alloc-util.h" |
430f0182 | 15 | #include "audit-util.h" |
cc377381 | 16 | #include "bus-error.h" |
4f5dd394 LP |
17 | #include "bus-util.h" |
18 | #include "escape.h" | |
3ffd4af2 | 19 | #include "fd-util.h" |
4f5dd394 | 20 | #include "fileio.h" |
f97b34a6 | 21 | #include "format-util.h" |
c004493c | 22 | #include "io-util.h" |
3ffd4af2 | 23 | #include "logind-session.h" |
4f5dd394 | 24 | #include "mkdir.h" |
6bedfcbb | 25 | #include "parse-util.h" |
4f5dd394 | 26 | #include "path-util.h" |
8b43440b | 27 | #include "string-table.h" |
288a74cc | 28 | #include "terminal-util.h" |
b1d4f8e1 | 29 | #include "user-util.h" |
4f5dd394 | 30 | #include "util.h" |
54191eb3 | 31 | #include "process-util.h" |
20263082 | 32 | |
5f41d1f1 LP |
33 | #define RELEASE_USEC (20*USEC_PER_SEC) |
34 | ||
35 | static void session_remove_fifo(Session *s); | |
36 | ||
9444b1f2 | 37 | Session* session_new(Manager *m, const char *id) { |
20263082 LP |
38 | Session *s; |
39 | ||
40 | assert(m); | |
41 | assert(id); | |
4b549144 | 42 | assert(session_id_valid(id)); |
20263082 | 43 | |
14c3baca | 44 | s = new0(Session, 1); |
20263082 LP |
45 | if (!s) |
46 | return NULL; | |
47 | ||
98a28fef | 48 | s->state_file = strappend("/run/systemd/sessions/", id); |
6b430fdb ZJS |
49 | if (!s->state_file) |
50 | return mfree(s); | |
20263082 | 51 | |
d5099efc | 52 | s->devices = hashmap_new(&devt_hash_ops); |
118ecf32 DH |
53 | if (!s->devices) { |
54 | free(s->state_file); | |
6b430fdb | 55 | return mfree(s); |
118ecf32 DH |
56 | } |
57 | ||
2b6bf07d | 58 | s->id = basename(s->state_file); |
20263082 LP |
59 | |
60 | if (hashmap_put(m->sessions, s->id, s) < 0) { | |
118ecf32 | 61 | hashmap_free(s->devices); |
f8e2fb7b | 62 | free(s->state_file); |
6b430fdb | 63 | return mfree(s); |
20263082 LP |
64 | } |
65 | ||
66 | s->manager = m; | |
932e3ee7 | 67 | s->fifo_fd = -1; |
90a18413 | 68 | s->vtfd = -1; |
3a87a86e | 69 | s->audit_id = AUDIT_SESSION_INVALID; |
20263082 LP |
70 | |
71 | return s; | |
72 | } | |
73 | ||
74 | void session_free(Session *s) { | |
118ecf32 DH |
75 | SessionDevice *sd; |
76 | ||
20263082 LP |
77 | assert(s); |
78 | ||
14c3baca | 79 | if (s->in_gc_queue) |
71fda00f | 80 | LIST_REMOVE(gc_queue, s->manager->session_gc_queue, s); |
14c3baca | 81 | |
5f41d1f1 LP |
82 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
83 | ||
cc377381 LP |
84 | session_remove_fifo(s); |
85 | ||
ae5e06bd DH |
86 | session_drop_controller(s); |
87 | ||
118ecf32 DH |
88 | while ((sd = hashmap_first(s->devices))) |
89 | session_device_free(sd); | |
90 | ||
91 | hashmap_free(s->devices); | |
92 | ||
20263082 | 93 | if (s->user) { |
71fda00f | 94 | LIST_REMOVE(sessions_by_user, s->user->sessions, s); |
20263082 LP |
95 | |
96 | if (s->user->display == s) | |
97 | s->user->display = NULL; | |
98 | } | |
99 | ||
9418f147 LP |
100 | if (s->seat) { |
101 | if (s->seat->active == s) | |
102 | s->seat->active = NULL; | |
d7bd01b5 DH |
103 | if (s->seat->pending_switch == s) |
104 | s->seat->pending_switch = NULL; | |
9418f147 | 105 | |
49e6fdbf | 106 | seat_evict_position(s->seat, s); |
71fda00f | 107 | LIST_REMOVE(sessions_by_seat, s->seat->sessions, s); |
9418f147 | 108 | } |
20263082 | 109 | |
fb6becb4 LP |
110 | if (s->scope) { |
111 | hashmap_remove(s->manager->session_units, s->scope); | |
112 | free(s->scope); | |
113 | } | |
114 | ||
115 | free(s->scope_job); | |
1713813d | 116 | |
cc377381 | 117 | sd_bus_message_unref(s->create_message); |
20263082 LP |
118 | |
119 | free(s->tty); | |
120 | free(s->display); | |
121 | free(s->remote_host); | |
3f49d45a | 122 | free(s->remote_user); |
98a28fef | 123 | free(s->service); |
a4cd87e9 | 124 | free(s->desktop); |
20263082 LP |
125 | |
126 | hashmap_remove(s->manager->sessions, s->id); | |
98a28fef | 127 | |
d2f92cdf | 128 | free(s->state_file); |
20263082 LP |
129 | free(s); |
130 | } | |
131 | ||
9444b1f2 LP |
132 | void session_set_user(Session *s, User *u) { |
133 | assert(s); | |
134 | assert(!s->user); | |
135 | ||
136 | s->user = u; | |
71fda00f | 137 | LIST_PREPEND(sessions_by_user, u->sessions, s); |
9444b1f2 LP |
138 | } |
139 | ||
aed24c4c FB |
140 | static void session_save_devices(Session *s, FILE *f) { |
141 | SessionDevice *sd; | |
142 | Iterator i; | |
143 | ||
144 | if (!hashmap_isempty(s->devices)) { | |
145 | fprintf(f, "DEVICES="); | |
146 | HASHMAP_FOREACH(sd, s->devices, i) | |
147 | fprintf(f, "%u:%u ", major(sd->dev), minor(sd->dev)); | |
148 | fprintf(f, "\n"); | |
149 | } | |
150 | } | |
151 | ||
20263082 | 152 | int session_save(Session *s) { |
507f22bd | 153 | _cleanup_free_ char *temp_path = NULL; |
cc377381 | 154 | _cleanup_fclose_ FILE *f = NULL; |
20263082 LP |
155 | int r = 0; |
156 | ||
157 | assert(s); | |
158 | ||
9444b1f2 LP |
159 | if (!s->user) |
160 | return -ESTALE; | |
161 | ||
accaeded LP |
162 | if (!s->started) |
163 | return 0; | |
164 | ||
37c1d5e9 | 165 | r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0, MKDIR_WARN_MODE); |
20263082 | 166 | if (r < 0) |
dacd6cee | 167 | goto fail; |
20263082 | 168 | |
14c3baca LP |
169 | r = fopen_temporary(s->state_file, &f, &temp_path); |
170 | if (r < 0) | |
dacd6cee | 171 | goto fail; |
20263082 LP |
172 | |
173 | assert(s->user); | |
174 | ||
14c3baca LP |
175 | fchmod(fileno(f), 0644); |
176 | ||
20263082 LP |
177 | fprintf(f, |
178 | "# This is private data. Do not parse.\n" | |
90b2de37 | 179 | "UID="UID_FMT"\n" |
20263082 LP |
180 | "USER=%s\n" |
181 | "ACTIVE=%i\n" | |
0604381b | 182 | "STATE=%s\n" |
fb6becb4 | 183 | "REMOTE=%i\n", |
90b2de37 | 184 | s->user->uid, |
20263082 LP |
185 | s->user->name, |
186 | session_is_active(s), | |
0604381b | 187 | session_state_to_string(session_get_state(s)), |
fb6becb4 | 188 | s->remote); |
20263082 | 189 | |
a91e4e53 | 190 | if (s->type >= 0) |
507f22bd | 191 | fprintf(f, "TYPE=%s\n", session_type_to_string(s->type)); |
a91e4e53 | 192 | |
55efac6c | 193 | if (s->class >= 0) |
507f22bd | 194 | fprintf(f, "CLASS=%s\n", session_class_to_string(s->class)); |
55efac6c | 195 | |
fb6becb4 LP |
196 | if (s->scope) |
197 | fprintf(f, "SCOPE=%s\n", s->scope); | |
fb6becb4 LP |
198 | if (s->scope_job) |
199 | fprintf(f, "SCOPE_JOB=%s\n", s->scope_job); | |
20263082 | 200 | |
932e3ee7 | 201 | if (s->fifo_path) |
507f22bd | 202 | fprintf(f, "FIFO=%s\n", s->fifo_path); |
932e3ee7 | 203 | |
20263082 | 204 | if (s->seat) |
507f22bd | 205 | fprintf(f, "SEAT=%s\n", s->seat->id); |
20263082 LP |
206 | |
207 | if (s->tty) | |
507f22bd | 208 | fprintf(f, "TTY=%s\n", s->tty); |
20263082 LP |
209 | |
210 | if (s->display) | |
507f22bd | 211 | fprintf(f, "DISPLAY=%s\n", s->display); |
20263082 | 212 | |
558c6490 LP |
213 | if (s->remote_host) { |
214 | _cleanup_free_ char *escaped; | |
215 | ||
216 | escaped = cescape(s->remote_host); | |
217 | if (!escaped) { | |
218 | r = -ENOMEM; | |
dacd6cee | 219 | goto fail; |
558c6490 LP |
220 | } |
221 | ||
222 | fprintf(f, "REMOTE_HOST=%s\n", escaped); | |
223 | } | |
224 | ||
225 | if (s->remote_user) { | |
226 | _cleanup_free_ char *escaped; | |
227 | ||
228 | escaped = cescape(s->remote_user); | |
229 | if (!escaped) { | |
230 | r = -ENOMEM; | |
dacd6cee | 231 | goto fail; |
558c6490 LP |
232 | } |
233 | ||
234 | fprintf(f, "REMOTE_USER=%s\n", escaped); | |
235 | } | |
236 | ||
237 | if (s->service) { | |
238 | _cleanup_free_ char *escaped; | |
20263082 | 239 | |
558c6490 LP |
240 | escaped = cescape(s->service); |
241 | if (!escaped) { | |
242 | r = -ENOMEM; | |
dacd6cee | 243 | goto fail; |
558c6490 LP |
244 | } |
245 | ||
246 | fprintf(f, "SERVICE=%s\n", escaped); | |
247 | } | |
3f49d45a | 248 | |
558c6490 LP |
249 | if (s->desktop) { |
250 | _cleanup_free_ char *escaped; | |
98a28fef | 251 | |
558c6490 LP |
252 | escaped = cescape(s->desktop); |
253 | if (!escaped) { | |
254 | r = -ENOMEM; | |
dacd6cee | 255 | goto fail; |
558c6490 LP |
256 | } |
257 | ||
258 | fprintf(f, "DESKTOP=%s\n", escaped); | |
259 | } | |
a4cd87e9 | 260 | |
bf7825ae | 261 | if (s->seat && seat_has_vts(s->seat)) |
92bd5ff3 | 262 | fprintf(f, "VTNR=%u\n", s->vtnr); |
20263082 | 263 | |
49e6fdbf | 264 | if (!s->vtnr) |
e6494a07 | 265 | fprintf(f, "POSITION=%u\n", s->position); |
49e6fdbf | 266 | |
54191eb3 | 267 | if (pid_is_valid(s->leader)) |
90b2de37 | 268 | fprintf(f, "LEADER="PID_FMT"\n", s->leader); |
20263082 | 269 | |
3a87a86e | 270 | if (audit_session_is_valid(s->audit_id)) |
507f22bd | 271 | fprintf(f, "AUDIT=%"PRIu32"\n", s->audit_id); |
20263082 | 272 | |
9444b1f2 LP |
273 | if (dual_timestamp_is_set(&s->timestamp)) |
274 | fprintf(f, | |
90b2de37 ZJS |
275 | "REALTIME="USEC_FMT"\n" |
276 | "MONOTONIC="USEC_FMT"\n", | |
277 | s->timestamp.realtime, | |
278 | s->timestamp.monotonic); | |
9444b1f2 | 279 | |
aed24c4c | 280 | if (s->controller) { |
6d33772f | 281 | fprintf(f, "CONTROLLER=%s\n", s->controller); |
aed24c4c FB |
282 | session_save_devices(s, f); |
283 | } | |
6d33772f | 284 | |
dacd6cee LP |
285 | r = fflush_and_check(f); |
286 | if (r < 0) | |
287 | goto fail; | |
14c3baca | 288 | |
dacd6cee | 289 | if (rename(temp_path, s->state_file) < 0) { |
20263082 | 290 | r = -errno; |
dacd6cee | 291 | goto fail; |
20263082 LP |
292 | } |
293 | ||
dacd6cee LP |
294 | return 0; |
295 | ||
296 | fail: | |
297 | (void) unlink(s->state_file); | |
14c3baca | 298 | |
dacd6cee LP |
299 | if (temp_path) |
300 | (void) unlink(temp_path); | |
301 | ||
302 | return log_error_errno(r, "Failed to save session data %s: %m", s->state_file); | |
20263082 LP |
303 | } |
304 | ||
aed24c4c FB |
305 | static int session_load_devices(Session *s, const char *devices) { |
306 | const char *p; | |
307 | int r = 0; | |
308 | ||
309 | assert(s); | |
310 | ||
311 | for (p = devices;;) { | |
312 | _cleanup_free_ char *word = NULL; | |
313 | SessionDevice *sd; | |
314 | dev_t dev; | |
315 | int k; | |
316 | ||
317 | k = extract_first_word(&p, &word, NULL, 0); | |
318 | if (k == 0) | |
319 | break; | |
320 | if (k < 0) { | |
321 | r = k; | |
322 | break; | |
323 | } | |
324 | ||
325 | k = parse_dev(word, &dev); | |
326 | if (k < 0) { | |
327 | r = k; | |
328 | continue; | |
329 | } | |
330 | ||
331 | /* The file descriptors for loaded devices will be reattached later. */ | |
332 | k = session_device_new(s, dev, false, &sd); | |
333 | if (k < 0) | |
334 | r = k; | |
335 | } | |
336 | ||
337 | if (r < 0) | |
338 | log_error_errno(r, "Loading session devices for session %s failed: %m", s->id); | |
339 | ||
340 | return r; | |
341 | } | |
dacd6cee | 342 | |
20263082 | 343 | int session_load(Session *s) { |
9444b1f2 | 344 | _cleanup_free_ char *remote = NULL, |
a185c5aa LP |
345 | *seat = NULL, |
346 | *vtnr = NULL, | |
be94d954 | 347 | *state = NULL, |
e6494a07 | 348 | *position = NULL, |
a185c5aa | 349 | *leader = NULL, |
55efac6c | 350 | *type = NULL, |
9444b1f2 LP |
351 | *class = NULL, |
352 | *uid = NULL, | |
353 | *realtime = NULL, | |
6d33772f | 354 | *monotonic = NULL, |
aed24c4c FB |
355 | *controller = NULL, |
356 | *active = NULL, | |
357 | *devices = NULL; | |
a185c5aa LP |
358 | |
359 | int k, r; | |
360 | ||
20263082 LP |
361 | assert(s); |
362 | ||
1a5a177e | 363 | r = parse_env_file(NULL, s->state_file, NEWLINE, |
a185c5aa | 364 | "REMOTE", &remote, |
fb6becb4 LP |
365 | "SCOPE", &s->scope, |
366 | "SCOPE_JOB", &s->scope_job, | |
932e3ee7 | 367 | "FIFO", &s->fifo_path, |
a185c5aa LP |
368 | "SEAT", &seat, |
369 | "TTY", &s->tty, | |
370 | "DISPLAY", &s->display, | |
371 | "REMOTE_HOST", &s->remote_host, | |
372 | "REMOTE_USER", &s->remote_user, | |
98a28fef | 373 | "SERVICE", &s->service, |
a4cd87e9 | 374 | "DESKTOP", &s->desktop, |
a185c5aa | 375 | "VTNR", &vtnr, |
be94d954 | 376 | "STATE", &state, |
e6494a07 | 377 | "POSITION", &position, |
a185c5aa | 378 | "LEADER", &leader, |
a91e4e53 | 379 | "TYPE", &type, |
55efac6c | 380 | "CLASS", &class, |
9444b1f2 LP |
381 | "UID", &uid, |
382 | "REALTIME", &realtime, | |
383 | "MONOTONIC", &monotonic, | |
6d33772f | 384 | "CONTROLLER", &controller, |
aed24c4c FB |
385 | "ACTIVE", &active, |
386 | "DEVICES", &devices, | |
a185c5aa LP |
387 | NULL); |
388 | ||
f647962d MS |
389 | if (r < 0) |
390 | return log_error_errno(r, "Failed to read %s: %m", s->state_file); | |
9444b1f2 LP |
391 | |
392 | if (!s->user) { | |
393 | uid_t u; | |
394 | User *user; | |
395 | ||
396 | if (!uid) { | |
397 | log_error("UID not specified for session %s", s->id); | |
398 | return -ENOENT; | |
399 | } | |
400 | ||
401 | r = parse_uid(uid, &u); | |
402 | if (r < 0) { | |
403 | log_error("Failed to parse UID value %s for session %s.", uid, s->id); | |
404 | return r; | |
405 | } | |
406 | ||
8cb4ab00 | 407 | user = hashmap_get(s->manager->users, UID_TO_PTR(u)); |
9444b1f2 LP |
408 | if (!user) { |
409 | log_error("User of session %s not known.", s->id); | |
410 | return -ENOENT; | |
411 | } | |
412 | ||
413 | session_set_user(s, user); | |
414 | } | |
a185c5aa LP |
415 | |
416 | if (remote) { | |
417 | k = parse_boolean(remote); | |
418 | if (k >= 0) | |
419 | s->remote = k; | |
420 | } | |
421 | ||
c506027a DH |
422 | if (vtnr) |
423 | safe_atou(vtnr, &s->vtnr); | |
424 | ||
9418f147 | 425 | if (seat && !s->seat) { |
a185c5aa LP |
426 | Seat *o; |
427 | ||
428 | o = hashmap_get(s->manager->seats, seat); | |
429 | if (o) | |
c506027a DH |
430 | r = seat_attach_session(o, s); |
431 | if (!o || r < 0) | |
432 | log_error("Cannot attach session %s to seat %s", s->id, seat); | |
a185c5aa LP |
433 | } |
434 | ||
c506027a DH |
435 | if (!s->seat || !seat_has_vts(s->seat)) |
436 | s->vtnr = 0; | |
a185c5aa | 437 | |
e6494a07 | 438 | if (position && s->seat) { |
49e6fdbf DH |
439 | unsigned int npos; |
440 | ||
e6494a07 | 441 | safe_atou(position, &npos); |
49e6fdbf DH |
442 | seat_claim_position(s->seat, s, npos); |
443 | } | |
444 | ||
a185c5aa | 445 | if (leader) { |
3a87a86e LP |
446 | if (parse_pid(leader, &s->leader) >= 0) |
447 | (void) audit_session_from_pid(s->leader, &s->audit_id); | |
a185c5aa LP |
448 | } |
449 | ||
a91e4e53 LP |
450 | if (type) { |
451 | SessionType t; | |
452 | ||
453 | t = session_type_from_string(type); | |
454 | if (t >= 0) | |
455 | s->type = t; | |
456 | } | |
457 | ||
55efac6c LP |
458 | if (class) { |
459 | SessionClass c; | |
460 | ||
461 | c = session_class_from_string(class); | |
462 | if (c >= 0) | |
463 | s->class = c; | |
464 | } | |
465 | ||
be94d954 MP |
466 | if (state && streq(state, "closing")) |
467 | s->stopping = true; | |
468 | ||
b4f78aea LP |
469 | if (s->fifo_path) { |
470 | int fd; | |
471 | ||
472 | /* If we open an unopened pipe for reading we will not | |
473 | get an EOF. to trigger an EOF we hence open it for | |
be94d954 MP |
474 | writing, but close it right away which then will |
475 | trigger the EOF. This will happen immediately if no | |
476 | other process has the FIFO open for writing, i. e. | |
477 | when the session died before logind (re)started. */ | |
b4f78aea LP |
478 | |
479 | fd = session_create_fifo(s); | |
03e334a1 | 480 | safe_close(fd); |
b4f78aea LP |
481 | } |
482 | ||
b895a735 BR |
483 | if (realtime) |
484 | timestamp_deserialize(realtime, &s->timestamp.realtime); | |
485 | if (monotonic) | |
486 | timestamp_deserialize(monotonic, &s->timestamp.monotonic); | |
a185c5aa | 487 | |
aed24c4c FB |
488 | if (active) { |
489 | k = parse_boolean(active); | |
490 | if (k >= 0) | |
491 | s->was_active = k; | |
492 | } | |
493 | ||
6d33772f | 494 | if (controller) { |
aed24c4c | 495 | if (bus_name_has_owner(s->manager->bus, controller, NULL) > 0) { |
dc6284e9 | 496 | session_set_controller(s, controller, false, false); |
aed24c4c FB |
497 | session_load_devices(s, devices); |
498 | } else | |
90a18413 | 499 | session_restore_vt(s); |
6d33772f DH |
500 | } |
501 | ||
a185c5aa | 502 | return r; |
20263082 LP |
503 | } |
504 | ||
505 | int session_activate(Session *s) { | |
d7bd01b5 DH |
506 | unsigned int num_pending; |
507 | ||
20263082 | 508 | assert(s); |
9444b1f2 | 509 | assert(s->user); |
20263082 | 510 | |
20263082 | 511 | if (!s->seat) |
15411c0c | 512 | return -EOPNOTSUPP; |
20263082 LP |
513 | |
514 | if (s->seat->active == s) | |
515 | return 0; | |
516 | ||
d7bd01b5 DH |
517 | /* on seats with VTs, we let VTs manage session-switching */ |
518 | if (seat_has_vts(s->seat)) { | |
92bd5ff3 | 519 | if (!s->vtnr) |
15411c0c | 520 | return -EOPNOTSUPP; |
d7bd01b5 DH |
521 | |
522 | return chvt(s->vtnr); | |
523 | } | |
524 | ||
525 | /* On seats without VTs, we implement session-switching in logind. We | |
526 | * try to pause all session-devices and wait until the session | |
527 | * controller acknowledged them. Once all devices are asleep, we simply | |
528 | * switch the active session and be done. | |
529 | * We save the session we want to switch to in seat->pending_switch and | |
530 | * seat_complete_switch() will perform the final switch. */ | |
531 | ||
532 | s->seat->pending_switch = s; | |
533 | ||
534 | /* if no devices are running, immediately perform the session switch */ | |
535 | num_pending = session_device_try_pause_all(s); | |
536 | if (!num_pending) | |
537 | seat_complete_switch(s->seat); | |
20263082 | 538 | |
d7bd01b5 | 539 | return 0; |
20263082 LP |
540 | } |
541 | ||
22f93314 | 542 | static int session_start_scope(Session *s, sd_bus_message *properties) { |
98a28fef LP |
543 | int r; |
544 | ||
545 | assert(s); | |
9444b1f2 | 546 | assert(s->user); |
98a28fef | 547 | |
fb6becb4 | 548 | if (!s->scope) { |
4afd3348 | 549 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; |
fb2367ed YW |
550 | _cleanup_free_ char *scope = NULL; |
551 | char *job = NULL; | |
90558f31 | 552 | const char *description; |
405e0255 | 553 | |
605405c6 | 554 | scope = strjoin("session-", s->id, ".scope"); |
d0af76e6 | 555 | if (!scope) |
ae018d9b LP |
556 | return log_oom(); |
557 | ||
81d62103 | 558 | description = strjoina("Session ", s->id, " of user ", s->user->name); |
90558f31 LP |
559 | |
560 | r = manager_start_scope( | |
561 | s->manager, | |
562 | scope, | |
563 | s->leader, | |
564 | s->user->slice, | |
565 | description, | |
566 | "systemd-logind.service", | |
567 | "systemd-user-sessions.service", | |
22f93314 | 568 | properties, |
90558f31 LP |
569 | &error, |
570 | &job); | |
fb2367ed YW |
571 | if (r < 0) |
572 | return log_error_errno(r, "Failed to start session scope %s: %s", scope, bus_error_message(&error, r)); | |
d0af76e6 | 573 | |
fb2367ed YW |
574 | |
575 | s->scope = TAKE_PTR(scope); | |
576 | free_and_replace(s->scope_job, job); | |
20263082 LP |
577 | } |
578 | ||
d0af76e6 | 579 | if (s->scope) |
90558f31 | 580 | (void) hashmap_put(s->manager->session_units, s->scope, s); |
d0af76e6 | 581 | |
20263082 LP |
582 | return 0; |
583 | } | |
584 | ||
22f93314 | 585 | int session_start(Session *s, sd_bus_message *properties) { |
20263082 LP |
586 | int r; |
587 | ||
588 | assert(s); | |
9444b1f2 LP |
589 | |
590 | if (!s->user) | |
591 | return -ESTALE; | |
20263082 | 592 | |
9418f147 LP |
593 | if (s->started) |
594 | return 0; | |
595 | ||
ed18b08b LP |
596 | r = user_start(s->user); |
597 | if (r < 0) | |
598 | return r; | |
599 | ||
fb6becb4 | 600 | /* Create cgroup */ |
22f93314 | 601 | r = session_start_scope(s, properties); |
fb6becb4 LP |
602 | if (r < 0) |
603 | return r; | |
604 | ||
d9eb81f9 | 605 | log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO, |
2b044526 | 606 | "MESSAGE_ID=" SD_MESSAGE_SESSION_START_STR, |
877d54e9 LP |
607 | "SESSION_ID=%s", s->id, |
608 | "USER_ID=%s", s->user->name, | |
de0671ee | 609 | "LEADER="PID_FMT, s->leader, |
a1230ff9 | 610 | LOG_MESSAGE("New session %s of user %s.", s->id, s->user->name)); |
98a28fef | 611 | |
9444b1f2 LP |
612 | if (!dual_timestamp_is_set(&s->timestamp)) |
613 | dual_timestamp_get(&s->timestamp); | |
14c3baca | 614 | |
e9816c48 LP |
615 | if (s->seat) |
616 | seat_read_active_vt(s->seat); | |
617 | ||
9418f147 LP |
618 | s->started = true; |
619 | ||
952d3260 LP |
620 | user_elect_display(s->user); |
621 | ||
5f41d1f1 | 622 | /* Save data */ |
e9816c48 | 623 | session_save(s); |
7f7bb946 | 624 | user_save(s->user); |
5f41d1f1 LP |
625 | if (s->seat) |
626 | seat_save(s->seat); | |
e9816c48 | 627 | |
5f41d1f1 | 628 | /* Send signals */ |
da119395 | 629 | session_send_signal(s, true); |
7d049e30 | 630 | user_send_changed(s->user, "Display", NULL); |
9418f147 LP |
631 | if (s->seat) { |
632 | if (s->seat->active == s) | |
7d049e30 | 633 | seat_send_changed(s->seat, "ActiveSession", NULL); |
9418f147 LP |
634 | } |
635 | ||
20263082 LP |
636 | return 0; |
637 | } | |
638 | ||
9bb69af4 | 639 | static int session_stop_scope(Session *s, bool force) { |
4afd3348 | 640 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; |
20263082 | 641 | int r; |
20263082 LP |
642 | |
643 | assert(s); | |
644 | ||
fb6becb4 LP |
645 | if (!s->scope) |
646 | return 0; | |
9b221b63 | 647 | |
756ed0e2 | 648 | /* Let's always abandon the scope first. This tells systemd that we are not interested anymore, and everything |
629ff674 | 649 | * that is left in the scope is "left-over". Informing systemd about this has the benefit that it will log |
756ed0e2 LP |
650 | * when killing any processes left after this point. */ |
651 | r = manager_abandon_scope(s->manager, s->scope, &error); | |
652 | if (r < 0) | |
653 | log_warning_errno(r, "Failed to abandon session scope, ignoring: %s", bus_error_message(&error, r)); | |
654 | ||
655 | /* Optionally, let's kill everything that's left now. */ | |
9bb69af4 | 656 | if (force || manager_shall_kill(s->manager, s->user->name)) { |
801a884d LP |
657 | char *job = NULL; |
658 | ||
5f41d1f1 | 659 | r = manager_stop_unit(s->manager, s->scope, &error, &job); |
801a884d LP |
660 | if (r < 0) |
661 | return log_error_errno(r, "Failed to stop session scope: %s", bus_error_message(&error, r)); | |
20263082 | 662 | |
5f41d1f1 LP |
663 | free(s->scope_job); |
664 | s->scope_job = job; | |
8150acb1 | 665 | } else { |
756ed0e2 | 666 | s->scope_job = mfree(s->scope_job); |
20263082 | 667 | |
8150acb1 AJ |
668 | /* With no killing, this session is allowed to persist in "closing" state indefinitely. |
669 | * Therefore session stop and session removal may be two distinct events. | |
670 | * Session stop is quite significant on its own, let's log it. */ | |
671 | log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO, | |
672 | "SESSION_ID=%s", s->id, | |
673 | "USER_ID=%s", s->user->name, | |
674 | "LEADER="PID_FMT, s->leader, | |
f4cf1d66 | 675 | LOG_MESSAGE("Session %s logged out. Waiting for processes to exit.", s->id)); |
8150acb1 AJ |
676 | } |
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, |
a1230ff9 | 724 | LOG_MESSAGE("Removed session %s.", s->id)); |
98a28fef | 725 | |
5f41d1f1 LP |
726 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
727 | ||
10189fd6 DH |
728 | if (s->seat) |
729 | seat_evict_position(s->seat, s); | |
730 | ||
118ecf32 DH |
731 | /* Kill session devices */ |
732 | while ((sd = hashmap_first(s->devices))) | |
733 | session_device_free(sd); | |
734 | ||
491ac9f2 | 735 | (void) unlink(s->state_file); |
d2f92cdf | 736 | session_add_to_gc_queue(s); |
ed18b08b | 737 | user_add_to_gc_queue(s->user); |
14c3baca | 738 | |
405e0255 | 739 | if (s->started) { |
ed18b08b | 740 | session_send_signal(s, false); |
405e0255 LP |
741 | s->started = false; |
742 | } | |
50fb9793 | 743 | |
9418f147 LP |
744 | if (s->seat) { |
745 | if (s->seat->active == s) | |
746 | seat_set_active(s->seat, NULL); | |
747 | ||
23bd3b62 | 748 | seat_save(s->seat); |
9418f147 LP |
749 | } |
750 | ||
23bd3b62 | 751 | user_save(s->user); |
7d049e30 | 752 | user_send_changed(s->user, "Display", NULL); |
9418f147 | 753 | |
491ac9f2 | 754 | return 0; |
20263082 LP |
755 | } |
756 | ||
5f41d1f1 LP |
757 | static int release_timeout_callback(sd_event_source *es, uint64_t usec, void *userdata) { |
758 | Session *s = userdata; | |
759 | ||
760 | assert(es); | |
761 | assert(s); | |
762 | ||
9bb69af4 | 763 | session_stop(s, false); |
5f41d1f1 LP |
764 | return 0; |
765 | } | |
766 | ||
ad8780c9 | 767 | int session_release(Session *s) { |
5f41d1f1 LP |
768 | assert(s); |
769 | ||
770 | if (!s->started || s->stopping) | |
ad8780c9 ZJS |
771 | return 0; |
772 | ||
773 | if (s->timer_event_source) | |
774 | return 0; | |
775 | ||
776 | return sd_event_add_time(s->manager->event, | |
777 | &s->timer_event_source, | |
778 | CLOCK_MONOTONIC, | |
779 | now(CLOCK_MONOTONIC) + RELEASE_USEC, 0, | |
780 | release_timeout_callback, s); | |
5f41d1f1 LP |
781 | } |
782 | ||
20263082 LP |
783 | bool session_is_active(Session *s) { |
784 | assert(s); | |
785 | ||
786 | if (!s->seat) | |
787 | return true; | |
788 | ||
789 | return s->seat->active == s; | |
790 | } | |
791 | ||
23406ce5 LP |
792 | static int get_tty_atime(const char *tty, usec_t *atime) { |
793 | _cleanup_free_ char *p = NULL; | |
a185c5aa | 794 | struct stat st; |
23406ce5 LP |
795 | |
796 | assert(tty); | |
797 | assert(atime); | |
798 | ||
799 | if (!path_is_absolute(tty)) { | |
800 | p = strappend("/dev/", tty); | |
801 | if (!p) | |
802 | return -ENOMEM; | |
803 | ||
804 | tty = p; | |
805 | } else if (!path_startswith(tty, "/dev/")) | |
806 | return -ENOENT; | |
807 | ||
808 | if (lstat(tty, &st) < 0) | |
809 | return -errno; | |
810 | ||
811 | *atime = timespec_load(&st.st_atim); | |
812 | return 0; | |
813 | } | |
814 | ||
815 | static int get_process_ctty_atime(pid_t pid, usec_t *atime) { | |
816 | _cleanup_free_ char *p = NULL; | |
817 | int r; | |
818 | ||
819 | assert(pid > 0); | |
820 | assert(atime); | |
821 | ||
822 | r = get_ctty(pid, NULL, &p); | |
823 | if (r < 0) | |
824 | return r; | |
825 | ||
826 | return get_tty_atime(p, atime); | |
827 | } | |
828 | ||
829 | int session_get_idle_hint(Session *s, dual_timestamp *t) { | |
23406ce5 LP |
830 | usec_t atime = 0, n; |
831 | int r; | |
a185c5aa LP |
832 | |
833 | assert(s); | |
834 | ||
23406ce5 | 835 | /* Explicit idle hint is set */ |
a185c5aa LP |
836 | if (s->idle_hint) { |
837 | if (t) | |
838 | *t = s->idle_hint_timestamp; | |
839 | ||
840 | return s->idle_hint; | |
841 | } | |
842 | ||
0762eaa3 | 843 | /* Graphical sessions should really implement a real |
23406ce5 | 844 | * idle hint logic */ |
129baf1b | 845 | if (SESSION_TYPE_IS_GRAPHICAL(s->type)) |
a185c5aa LP |
846 | goto dont_know; |
847 | ||
23406ce5 LP |
848 | /* For sessions with an explicitly configured tty, let's check |
849 | * its atime */ | |
850 | if (s->tty) { | |
851 | r = get_tty_atime(s->tty, &atime); | |
852 | if (r >= 0) | |
853 | goto found_atime; | |
854 | } | |
a185c5aa | 855 | |
23406ce5 LP |
856 | /* For sessions with a leader but no explicitly configured |
857 | * tty, let's check the controlling tty of the leader */ | |
858 | if (s->leader > 0) { | |
859 | r = get_process_ctty_atime(s->leader, &atime); | |
860 | if (r >= 0) | |
861 | goto found_atime; | |
a185c5aa LP |
862 | } |
863 | ||
a185c5aa LP |
864 | dont_know: |
865 | if (t) | |
866 | *t = s->idle_hint_timestamp; | |
867 | ||
868 | return 0; | |
23406ce5 LP |
869 | |
870 | found_atime: | |
871 | if (t) | |
872 | dual_timestamp_from_realtime(t, atime); | |
873 | ||
874 | n = now(CLOCK_REALTIME); | |
875 | ||
876 | if (s->manager->idle_action_usec <= 0) | |
877 | return 0; | |
878 | ||
879 | return atime + s->manager->idle_action_usec <= n; | |
a185c5aa LP |
880 | } |
881 | ||
bef422ae LP |
882 | void session_set_idle_hint(Session *s, bool b) { |
883 | assert(s); | |
884 | ||
885 | if (s->idle_hint == b) | |
886 | return; | |
887 | ||
888 | s->idle_hint = b; | |
889 | dual_timestamp_get(&s->idle_hint_timestamp); | |
9418f147 | 890 | |
cc377381 | 891 | session_send_changed(s, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); |
9418f147 LP |
892 | |
893 | if (s->seat) | |
cc377381 LP |
894 | seat_send_changed(s->seat, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); |
895 | ||
896 | user_send_changed(s->user, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); | |
897 | manager_send_changed(s->manager, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); | |
898 | } | |
899 | ||
42d35e13 VT |
900 | int session_get_locked_hint(Session *s) { |
901 | assert(s); | |
902 | ||
903 | return s->locked_hint; | |
904 | } | |
905 | ||
906 | void session_set_locked_hint(Session *s, bool b) { | |
907 | assert(s); | |
908 | ||
909 | if (s->locked_hint == b) | |
910 | return; | |
911 | ||
912 | s->locked_hint = b; | |
913 | ||
914 | session_send_changed(s, "LockedHint", NULL); | |
915 | } | |
916 | ||
cc377381 LP |
917 | static int session_dispatch_fifo(sd_event_source *es, int fd, uint32_t revents, void *userdata) { |
918 | Session *s = userdata; | |
919 | ||
920 | assert(s); | |
921 | assert(s->fifo_fd == fd); | |
922 | ||
923 | /* EOF on the FIFO means the session died abnormally. */ | |
924 | ||
925 | session_remove_fifo(s); | |
9bb69af4 | 926 | session_stop(s, false); |
cc377381 LP |
927 | |
928 | return 1; | |
bef422ae LP |
929 | } |
930 | ||
932e3ee7 LP |
931 | int session_create_fifo(Session *s) { |
932 | int r; | |
933 | ||
31b79c2b LP |
934 | assert(s); |
935 | ||
b4f78aea | 936 | /* Create FIFO */ |
932e3ee7 | 937 | if (!s->fifo_path) { |
37c1d5e9 | 938 | r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0, MKDIR_WARN_MODE); |
e6061ab2 LP |
939 | if (r < 0) |
940 | return r; | |
941 | ||
932e3ee7 LP |
942 | if (asprintf(&s->fifo_path, "/run/systemd/sessions/%s.ref", s->id) < 0) |
943 | return -ENOMEM; | |
31b79c2b | 944 | |
932e3ee7 LP |
945 | if (mkfifo(s->fifo_path, 0600) < 0 && errno != EEXIST) |
946 | return -errno; | |
947 | } | |
31b79c2b | 948 | |
932e3ee7 | 949 | /* Open reading side */ |
b4f78aea | 950 | if (s->fifo_fd < 0) { |
db4a47e9 | 951 | s->fifo_fd = open(s->fifo_path, O_RDONLY|O_CLOEXEC|O_NONBLOCK); |
b4f78aea LP |
952 | if (s->fifo_fd < 0) |
953 | return -errno; | |
954 | ||
cc377381 LP |
955 | } |
956 | ||
957 | if (!s->fifo_event_source) { | |
151b9b96 | 958 | r = sd_event_add_io(s->manager->event, &s->fifo_event_source, s->fifo_fd, 0, session_dispatch_fifo, s); |
b4f78aea LP |
959 | if (r < 0) |
960 | return r; | |
961 | ||
e11544a8 LP |
962 | /* Let's make sure we noticed dead sessions before we process new bus requests (which might create new |
963 | * sessions). */ | |
964 | r = sd_event_source_set_priority(s->fifo_event_source, SD_EVENT_PRIORITY_NORMAL-10); | |
cc377381 LP |
965 | if (r < 0) |
966 | return r; | |
b4f78aea | 967 | } |
932e3ee7 LP |
968 | |
969 | /* Open writing side */ | |
db4a47e9 | 970 | r = open(s->fifo_path, O_WRONLY|O_CLOEXEC|O_NONBLOCK); |
932e3ee7 LP |
971 | if (r < 0) |
972 | return -errno; | |
31b79c2b | 973 | |
932e3ee7 LP |
974 | return r; |
975 | } | |
976 | ||
5f41d1f1 | 977 | static void session_remove_fifo(Session *s) { |
932e3ee7 LP |
978 | assert(s); |
979 | ||
03e334a1 LP |
980 | s->fifo_event_source = sd_event_source_unref(s->fifo_event_source); |
981 | s->fifo_fd = safe_close(s->fifo_fd); | |
932e3ee7 LP |
982 | |
983 | if (s->fifo_path) { | |
984 | unlink(s->fifo_path); | |
a1e58e8e | 985 | s->fifo_path = mfree(s->fifo_path); |
932e3ee7 | 986 | } |
31b79c2b LP |
987 | } |
988 | ||
5c093a23 | 989 | bool session_may_gc(Session *s, bool drop_not_started) { |
20263082 LP |
990 | assert(s); |
991 | ||
4a4b033f | 992 | if (drop_not_started && !s->started) |
5c093a23 | 993 | return true; |
932e3ee7 | 994 | |
9444b1f2 | 995 | if (!s->user) |
5c093a23 | 996 | return true; |
9444b1f2 | 997 | |
932e3ee7 | 998 | if (s->fifo_fd >= 0) { |
5f41d1f1 | 999 | if (pipe_eof(s->fifo_fd) <= 0) |
5c093a23 | 1000 | return false; |
20263082 LP |
1001 | } |
1002 | ||
cc377381 | 1003 | if (s->scope_job && manager_job_is_active(s->manager, s->scope_job)) |
5c093a23 | 1004 | return false; |
20263082 | 1005 | |
cc377381 | 1006 | if (s->scope && manager_unit_is_active(s->manager, s->scope)) |
5c093a23 | 1007 | return false; |
20263082 | 1008 | |
5c093a23 | 1009 | return true; |
20263082 LP |
1010 | } |
1011 | ||
14c3baca LP |
1012 | void session_add_to_gc_queue(Session *s) { |
1013 | assert(s); | |
1014 | ||
1015 | if (s->in_gc_queue) | |
1016 | return; | |
1017 | ||
71fda00f | 1018 | LIST_PREPEND(gc_queue, s->manager->session_gc_queue, s); |
14c3baca LP |
1019 | s->in_gc_queue = true; |
1020 | } | |
1021 | ||
0604381b LP |
1022 | SessionState session_get_state(Session *s) { |
1023 | assert(s); | |
1024 | ||
8fe63cd4 | 1025 | /* always check closing first */ |
5f41d1f1 LP |
1026 | if (s->stopping || s->timer_event_source) |
1027 | return SESSION_CLOSING; | |
1028 | ||
8fe63cd4 | 1029 | if (s->scope_job || s->fifo_fd < 0) |
405e0255 | 1030 | return SESSION_OPENING; |
fb6becb4 | 1031 | |
0604381b LP |
1032 | if (session_is_active(s)) |
1033 | return SESSION_ACTIVE; | |
1034 | ||
1035 | return SESSION_ONLINE; | |
1036 | } | |
1037 | ||
de07ab16 | 1038 | int session_kill(Session *s, KillWho who, int signo) { |
de07ab16 LP |
1039 | assert(s); |
1040 | ||
fb6becb4 | 1041 | if (!s->scope) |
de07ab16 LP |
1042 | return -ESRCH; |
1043 | ||
fb6becb4 | 1044 | return manager_kill_unit(s->manager, s->scope, who, signo, NULL); |
de07ab16 LP |
1045 | } |
1046 | ||
90a18413 | 1047 | static int session_open_vt(Session *s) { |
5f41d1f1 | 1048 | char path[sizeof("/dev/tty") + DECIMAL_STR_MAX(s->vtnr)]; |
90a18413 | 1049 | |
baccf3e4 OB |
1050 | if (s->vtnr < 1) |
1051 | return -ENODEV; | |
90a18413 DH |
1052 | |
1053 | if (s->vtfd >= 0) | |
1054 | return s->vtfd; | |
1055 | ||
92bd5ff3 | 1056 | sprintf(path, "/dev/tty%u", s->vtnr); |
22356953 | 1057 | s->vtfd = open_terminal(path, O_RDWR | O_CLOEXEC | O_NONBLOCK | O_NOCTTY); |
4a62c710 | 1058 | if (s->vtfd < 0) |
709f6e46 | 1059 | return log_error_errno(s->vtfd, "cannot open VT %s of session %s: %m", path, s->id); |
90a18413 DH |
1060 | |
1061 | return s->vtfd; | |
1062 | } | |
1063 | ||
baccf3e4 | 1064 | int session_prepare_vt(Session *s) { |
90a18413 DH |
1065 | int vt, r; |
1066 | struct vt_mode mode = { 0 }; | |
90a18413 | 1067 | |
baccf3e4 OB |
1068 | if (s->vtnr < 1) |
1069 | return 0; | |
1070 | ||
90a18413 DH |
1071 | vt = session_open_vt(s); |
1072 | if (vt < 0) | |
baccf3e4 | 1073 | return vt; |
90a18413 | 1074 | |
d6176c6c | 1075 | r = fchown(vt, s->user->uid, -1); |
baccf3e4 | 1076 | if (r < 0) { |
94c156cd LP |
1077 | r = log_error_errno(errno, |
1078 | "Cannot change owner of /dev/tty%u: %m", | |
1079 | s->vtnr); | |
d6176c6c | 1080 | goto error; |
baccf3e4 | 1081 | } |
d6176c6c | 1082 | |
90a18413 | 1083 | r = ioctl(vt, KDSKBMODE, K_OFF); |
baccf3e4 | 1084 | if (r < 0) { |
94c156cd LP |
1085 | r = log_error_errno(errno, |
1086 | "Cannot set K_OFF on /dev/tty%u: %m", | |
1087 | s->vtnr); | |
90a18413 | 1088 | goto error; |
baccf3e4 | 1089 | } |
90a18413 DH |
1090 | |
1091 | r = ioctl(vt, KDSETMODE, KD_GRAPHICS); | |
baccf3e4 | 1092 | if (r < 0) { |
94c156cd LP |
1093 | r = log_error_errno(errno, |
1094 | "Cannot set KD_GRAPHICS on /dev/tty%u: %m", | |
1095 | s->vtnr); | |
90a18413 | 1096 | goto error; |
baccf3e4 | 1097 | } |
90a18413 | 1098 | |
90a18413 DH |
1099 | /* Oh, thanks to the VT layer, VT_AUTO does not work with KD_GRAPHICS. |
1100 | * So we need a dummy handler here which just acknowledges *all* VT | |
1101 | * switch requests. */ | |
1102 | mode.mode = VT_PROCESS; | |
92683ad2 DH |
1103 | mode.relsig = SIGRTMIN; |
1104 | mode.acqsig = SIGRTMIN + 1; | |
90a18413 | 1105 | r = ioctl(vt, VT_SETMODE, &mode); |
baccf3e4 | 1106 | if (r < 0) { |
94c156cd LP |
1107 | r = log_error_errno(errno, |
1108 | "Cannot set VT_PROCESS on /dev/tty%u: %m", | |
1109 | s->vtnr); | |
90a18413 | 1110 | goto error; |
baccf3e4 | 1111 | } |
90a18413 | 1112 | |
baccf3e4 | 1113 | return 0; |
90a18413 DH |
1114 | |
1115 | error: | |
90a18413 | 1116 | session_restore_vt(s); |
baccf3e4 | 1117 | return r; |
90a18413 DH |
1118 | } |
1119 | ||
1120 | void session_restore_vt(Session *s) { | |
16597ac3 LP |
1121 | |
1122 | static const struct vt_mode mode = { | |
1123 | .mode = VT_AUTO, | |
1124 | }; | |
1125 | ||
c83f349c | 1126 | int vt, old_fd; |
90a18413 | 1127 | |
128df4cf OT |
1128 | /* We need to get a fresh handle to the virtual terminal, |
1129 | * since the old file-descriptor is potentially in a hung-up | |
1130 | * state after the controlling process exited; we do a | |
1131 | * little dance to avoid having the terminal be available | |
1132 | * for reuse before we've cleaned it up. | |
1133 | */ | |
c10d6bdb | 1134 | old_fd = TAKE_FD(s->vtfd); |
128df4cf | 1135 | |
90a18413 | 1136 | vt = session_open_vt(s); |
128df4cf OT |
1137 | safe_close(old_fd); |
1138 | ||
90a18413 DH |
1139 | if (vt < 0) |
1140 | return; | |
1141 | ||
2bf10523 | 1142 | (void) ioctl(vt, KDSETMODE, KD_TEXT); |
90a18413 | 1143 | |
c83f349c | 1144 | (void) vt_reset_keyboard(vt); |
90a18413 | 1145 | |
2bf10523 | 1146 | (void) ioctl(vt, VT_SETMODE, &mode); |
16597ac3 | 1147 | (void) fchown(vt, 0, (gid_t) -1); |
d6176c6c | 1148 | |
03e334a1 | 1149 | s->vtfd = safe_close(s->vtfd); |
90a18413 DH |
1150 | } |
1151 | ||
2ec3ff66 | 1152 | void session_leave_vt(Session *s) { |
ce540a24 DH |
1153 | int r; |
1154 | ||
2ec3ff66 DH |
1155 | assert(s); |
1156 | ||
1157 | /* This is called whenever we get a VT-switch signal from the kernel. | |
1158 | * We acknowledge all of them unconditionally. Note that session are | |
1159 | * free to overwrite those handlers and we only register them for | |
1160 | * sessions with controllers. Legacy sessions are not affected. | |
1161 | * However, if we switch from a non-legacy to a legacy session, we must | |
1162 | * make sure to pause all device before acknowledging the switch. We | |
1163 | * process the real switch only after we are notified via sysfs, so the | |
1164 | * legacy session might have already started using the devices. If we | |
1165 | * don't pause the devices before the switch, we might confuse the | |
1166 | * session we switch to. */ | |
1167 | ||
1168 | if (s->vtfd < 0) | |
1169 | return; | |
1170 | ||
1171 | session_device_pause_all(s); | |
ce540a24 DH |
1172 | r = ioctl(s->vtfd, VT_RELDISP, 1); |
1173 | if (r < 0) | |
56f64d95 | 1174 | log_debug_errno(errno, "Cannot release VT of session %s: %m", s->id); |
2ec3ff66 DH |
1175 | } |
1176 | ||
cc377381 | 1177 | bool session_is_controller(Session *s, const char *sender) { |
ae5e06bd DH |
1178 | assert(s); |
1179 | ||
1180 | return streq_ptr(s->controller, sender); | |
1181 | } | |
1182 | ||
b12e5615 DH |
1183 | static void session_release_controller(Session *s, bool notify) { |
1184 | _cleanup_free_ char *name = NULL; | |
6d33772f DH |
1185 | SessionDevice *sd; |
1186 | ||
b12e5615 DH |
1187 | if (!s->controller) |
1188 | return; | |
6d33772f | 1189 | |
b12e5615 | 1190 | name = s->controller; |
90a18413 | 1191 | |
b12e5615 DH |
1192 | /* By resetting the controller before releasing the devices, we won't |
1193 | * send notification signals. This avoids sending useless notifications | |
1194 | * if the controller is released on disconnects. */ | |
1195 | if (!notify) | |
1196 | s->controller = NULL; | |
6d33772f | 1197 | |
b12e5615 DH |
1198 | while ((sd = hashmap_first(s->devices))) |
1199 | session_device_free(sd); | |
1200 | ||
1201 | s->controller = NULL; | |
3cde9e8f DM |
1202 | s->track = sd_bus_track_unref(s->track); |
1203 | } | |
1204 | ||
1205 | static int on_bus_track(sd_bus_track *track, void *userdata) { | |
1206 | Session *s = userdata; | |
1207 | ||
1208 | assert(track); | |
1209 | assert(s); | |
1210 | ||
1211 | session_drop_controller(s); | |
1212 | ||
1213 | return 0; | |
6d33772f DH |
1214 | } |
1215 | ||
dc6284e9 | 1216 | int session_set_controller(Session *s, const char *sender, bool force, bool prepare) { |
b12e5615 | 1217 | _cleanup_free_ char *name = NULL; |
ae5e06bd DH |
1218 | int r; |
1219 | ||
1220 | assert(s); | |
1221 | assert(sender); | |
1222 | ||
1223 | if (session_is_controller(s, sender)) | |
1224 | return 0; | |
1225 | if (s->controller && !force) | |
1226 | return -EBUSY; | |
1227 | ||
b12e5615 DH |
1228 | name = strdup(sender); |
1229 | if (!name) | |
ae5e06bd DH |
1230 | return -ENOMEM; |
1231 | ||
3cde9e8f DM |
1232 | s->track = sd_bus_track_unref(s->track); |
1233 | r = sd_bus_track_new(s->manager->bus, &s->track, on_bus_track, s); | |
1234 | if (r < 0) | |
1235 | return r; | |
1236 | ||
1237 | r = sd_bus_track_add_name(s->track, name); | |
1238 | if (r < 0) | |
ae5e06bd | 1239 | return r; |
ae5e06bd | 1240 | |
90a18413 DH |
1241 | /* When setting a session controller, we forcibly mute the VT and set |
1242 | * it into graphics-mode. Applications can override that by changing | |
1243 | * VT state after calling TakeControl(). However, this serves as a good | |
1244 | * default and well-behaving controllers can now ignore VTs entirely. | |
1245 | * Note that we reset the VT on ReleaseControl() and if the controller | |
1246 | * exits. | |
1247 | * If logind crashes/restarts, we restore the controller during restart | |
dc6284e9 FB |
1248 | * (without preparing the VT since the controller has probably overridden |
1249 | * VT state by now) or reset the VT in case it crashed/exited, too. */ | |
1250 | if (prepare) { | |
1251 | r = session_prepare_vt(s); | |
1252 | if (r < 0) { | |
1253 | s->track = sd_bus_track_unref(s->track); | |
1254 | return r; | |
1255 | } | |
13f493dc | 1256 | } |
baccf3e4 | 1257 | |
b12e5615 | 1258 | session_release_controller(s, true); |
ae2a15bc | 1259 | s->controller = TAKE_PTR(name); |
b12e5615 | 1260 | session_save(s); |
90a18413 | 1261 | |
ae5e06bd DH |
1262 | return 0; |
1263 | } | |
1264 | ||
1265 | void session_drop_controller(Session *s) { | |
1266 | assert(s); | |
1267 | ||
1268 | if (!s->controller) | |
1269 | return; | |
1270 | ||
3cde9e8f | 1271 | s->track = sd_bus_track_unref(s->track); |
b12e5615 DH |
1272 | session_release_controller(s, false); |
1273 | session_save(s); | |
1274 | session_restore_vt(s); | |
ae5e06bd DH |
1275 | } |
1276 | ||
fb6becb4 LP |
1277 | static const char* const session_state_table[_SESSION_STATE_MAX] = { |
1278 | [SESSION_OPENING] = "opening", | |
0604381b LP |
1279 | [SESSION_ONLINE] = "online", |
1280 | [SESSION_ACTIVE] = "active", | |
1281 | [SESSION_CLOSING] = "closing" | |
1282 | }; | |
1283 | ||
1284 | DEFINE_STRING_TABLE_LOOKUP(session_state, SessionState); | |
1285 | ||
20263082 | 1286 | static const char* const session_type_table[_SESSION_TYPE_MAX] = { |
2c5859af | 1287 | [SESSION_UNSPECIFIED] = "unspecified", |
3f49d45a | 1288 | [SESSION_TTY] = "tty", |
98a28fef | 1289 | [SESSION_X11] = "x11", |
d9eb81f9 | 1290 | [SESSION_WAYLAND] = "wayland", |
9541666b | 1291 | [SESSION_MIR] = "mir", |
e9e74f28 | 1292 | [SESSION_WEB] = "web", |
20263082 LP |
1293 | }; |
1294 | ||
1295 | DEFINE_STRING_TABLE_LOOKUP(session_type, SessionType); | |
de07ab16 | 1296 | |
55efac6c LP |
1297 | static const char* const session_class_table[_SESSION_CLASS_MAX] = { |
1298 | [SESSION_USER] = "user", | |
1299 | [SESSION_GREETER] = "greeter", | |
e2acb67b LP |
1300 | [SESSION_LOCK_SCREEN] = "lock-screen", |
1301 | [SESSION_BACKGROUND] = "background" | |
55efac6c LP |
1302 | }; |
1303 | ||
1304 | DEFINE_STRING_TABLE_LOOKUP(session_class, SessionClass); | |
1305 | ||
de07ab16 LP |
1306 | static const char* const kill_who_table[_KILL_WHO_MAX] = { |
1307 | [KILL_LEADER] = "leader", | |
1308 | [KILL_ALL] = "all" | |
1309 | }; | |
1310 | ||
1311 | DEFINE_STRING_TABLE_LOOKUP(kill_who, KillWho); |