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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 <assert.h> | |
23 | #include <errno.h> | |
24 | #include <unistd.h> | |
25 | #include <fcntl.h> | |
26 | #include <sys/ioctl.h> | |
27 | #include <linux/vt.h> | |
5eda94dd | 28 | #include <string.h> |
20263082 | 29 | |
877d54e9 LP |
30 | #include "systemd/sd-id128.h" |
31 | #include "systemd/sd-messages.h" | |
90821c93 | 32 | #include "logind-seat.h" |
5eda94dd | 33 | #include "logind-acl.h" |
20263082 | 34 | #include "util.h" |
49e942b2 | 35 | #include "mkdir.h" |
9eb977db | 36 | #include "path-util.h" |
20263082 LP |
37 | |
38 | Seat *seat_new(Manager *m, const char *id) { | |
39 | Seat *s; | |
40 | ||
41 | assert(m); | |
42 | assert(id); | |
43 | ||
44 | s = new0(Seat, 1); | |
45 | if (!s) | |
46 | return NULL; | |
47 | ||
98a28fef | 48 | s->state_file = strappend("/run/systemd/seats/", id); |
20263082 LP |
49 | if (!s->state_file) { |
50 | free(s); | |
51 | return NULL; | |
52 | } | |
53 | ||
9eb977db | 54 | s->id = path_get_file_name(s->state_file); |
14c3baca | 55 | s->manager = m; |
20263082 LP |
56 | |
57 | if (hashmap_put(m->seats, s->id, s) < 0) { | |
14c3baca | 58 | free(s->state_file); |
20263082 LP |
59 | free(s); |
60 | return NULL; | |
61 | } | |
62 | ||
20263082 LP |
63 | return s; |
64 | } | |
65 | ||
66 | void seat_free(Seat *s) { | |
67 | assert(s); | |
68 | ||
14c3baca LP |
69 | if (s->in_gc_queue) |
70 | LIST_REMOVE(Seat, gc_queue, s->manager->seat_gc_queue, s); | |
71 | ||
20263082 LP |
72 | while (s->sessions) |
73 | session_free(s->sessions); | |
74 | ||
75 | assert(!s->active); | |
76 | ||
77 | while (s->devices) | |
78 | device_free(s->devices); | |
79 | ||
80 | hashmap_remove(s->manager->seats, s->id); | |
81 | ||
d2f92cdf | 82 | free(s->state_file); |
20263082 LP |
83 | free(s); |
84 | } | |
85 | ||
86 | int seat_save(Seat *s) { | |
20263082 | 87 | int r; |
14c3baca LP |
88 | FILE *f; |
89 | char *temp_path; | |
20263082 LP |
90 | |
91 | assert(s); | |
92 | ||
accaeded LP |
93 | if (!s->started) |
94 | return 0; | |
95 | ||
d2e54fae | 96 | r = mkdir_safe_label("/run/systemd/seats", 0755, 0, 0); |
20263082 | 97 | if (r < 0) |
14c3baca LP |
98 | goto finish; |
99 | ||
100 | r = fopen_temporary(s->state_file, &f, &temp_path); | |
101 | if (r < 0) | |
102 | goto finish; | |
20263082 | 103 | |
14c3baca | 104 | fchmod(fileno(f), 0644); |
20263082 LP |
105 | |
106 | fprintf(f, | |
14c3baca | 107 | "# This is private data. Do not parse.\n" |
92432fcc | 108 | "IS_SEAT0=%i\n" |
f1a8e221 LP |
109 | "CAN_MULTI_SESSION=%i\n" |
110 | "CAN_TTY=%i\n" | |
111 | "CAN_GRAPHICAL=%i\n", | |
92432fcc | 112 | seat_is_seat0(s), |
f1a8e221 LP |
113 | seat_can_multi_session(s), |
114 | seat_can_tty(s), | |
115 | seat_can_graphical(s)); | |
20263082 LP |
116 | |
117 | if (s->active) { | |
118 | assert(s->active->user); | |
119 | ||
120 | fprintf(f, | |
121 | "ACTIVE=%s\n" | |
122 | "ACTIVE_UID=%lu\n", | |
123 | s->active->id, | |
124 | (unsigned long) s->active->user->uid); | |
125 | } | |
126 | ||
127 | if (s->sessions) { | |
128 | Session *i; | |
20263082 | 129 | |
fde78a3a | 130 | fputs("SESSIONS=", f); |
20263082 | 131 | LIST_FOREACH(sessions_by_seat, i, s->sessions) { |
14c3baca LP |
132 | fprintf(f, |
133 | "%s%c", | |
134 | i->id, | |
135 | i->sessions_by_seat_next ? ' ' : '\n'); | |
136 | } | |
20263082 | 137 | |
fde78a3a LP |
138 | fputs("UIDS=", f); |
139 | LIST_FOREACH(sessions_by_seat, i, s->sessions) | |
20263082 | 140 | fprintf(f, |
14c3baca LP |
141 | "%lu%c", |
142 | (unsigned long) i->user->uid, | |
143 | i->sessions_by_seat_next ? ' ' : '\n'); | |
20263082 LP |
144 | } |
145 | ||
146 | fflush(f); | |
14c3baca LP |
147 | |
148 | if (ferror(f) || rename(temp_path, s->state_file) < 0) { | |
20263082 LP |
149 | r = -errno; |
150 | unlink(s->state_file); | |
14c3baca | 151 | unlink(temp_path); |
20263082 LP |
152 | } |
153 | ||
154 | fclose(f); | |
14c3baca LP |
155 | free(temp_path); |
156 | ||
157 | finish: | |
158 | if (r < 0) | |
159 | log_error("Failed to save seat data for %s: %s", s->id, strerror(-r)); | |
160 | ||
20263082 LP |
161 | return r; |
162 | } | |
163 | ||
164 | int seat_load(Seat *s) { | |
165 | assert(s); | |
166 | ||
a185c5aa LP |
167 | /* There isn't actually anything to read here ... */ |
168 | ||
20263082 LP |
169 | return 0; |
170 | } | |
171 | ||
172 | static int vt_allocate(int vtnr) { | |
173 | int fd, r; | |
174 | char *p; | |
175 | ||
176 | assert(vtnr >= 1); | |
177 | ||
178 | if (asprintf(&p, "/dev/tty%i", vtnr) < 0) | |
179 | return -ENOMEM; | |
180 | ||
181 | fd = open_terminal(p, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
182 | free(p); | |
183 | ||
184 | r = fd < 0 ? -errno : 0; | |
185 | ||
186 | if (fd >= 0) | |
187 | close_nointr_nofail(fd); | |
188 | ||
189 | return r; | |
190 | } | |
191 | ||
30ed21ce | 192 | int seat_preallocate_vts(Seat *s) { |
3f49d45a LP |
193 | int r = 0; |
194 | unsigned i; | |
20263082 LP |
195 | |
196 | assert(s); | |
197 | assert(s->manager); | |
198 | ||
30ed21ce LP |
199 | log_debug("Preallocating VTs..."); |
200 | ||
20263082 LP |
201 | if (s->manager->n_autovts <= 0) |
202 | return 0; | |
203 | ||
addedec4 | 204 | if (!seat_can_multi_session(s)) |
20263082 LP |
205 | return 0; |
206 | ||
e7886786 | 207 | for (i = 1; i <= s->manager->n_autovts; i++) { |
20263082 LP |
208 | int q; |
209 | ||
210 | q = vt_allocate(i); | |
14c3baca LP |
211 | if (q < 0) { |
212 | log_error("Failed to preallocate VT %i: %s", i, strerror(-q)); | |
20263082 | 213 | r = q; |
14c3baca | 214 | } |
20263082 LP |
215 | } |
216 | ||
217 | return r; | |
218 | } | |
219 | ||
5eda94dd LP |
220 | int seat_apply_acls(Seat *s, Session *old_active) { |
221 | int r; | |
20263082 | 222 | |
5eda94dd | 223 | assert(s); |
20263082 | 224 | |
5eda94dd LP |
225 | r = devnode_acl_all(s->manager->udev, |
226 | s->id, | |
227 | false, | |
228 | !!old_active, old_active ? old_active->user->uid : 0, | |
229 | !!s->active, s->active ? s->active->user->uid : 0); | |
20263082 | 230 | |
5eda94dd LP |
231 | if (r < 0) |
232 | log_error("Failed to apply ACLs: %s", strerror(-r)); | |
20263082 LP |
233 | |
234 | return r; | |
235 | } | |
236 | ||
9418f147 LP |
237 | int seat_set_active(Seat *s, Session *session) { |
238 | Session *old_active; | |
239 | ||
240 | assert(s); | |
77527da0 | 241 | assert(!session || session->seat == s); |
9418f147 LP |
242 | |
243 | if (session == s->active) | |
244 | return 0; | |
245 | ||
246 | old_active = s->active; | |
247 | s->active = session; | |
248 | ||
249 | seat_apply_acls(s, old_active); | |
250 | ||
251 | if (session && session->started) | |
252 | session_send_changed(session, "Active\0"); | |
253 | ||
254 | if (!session || session->started) | |
255 | seat_send_changed(s, "ActiveSession\0"); | |
256 | ||
98a28fef LP |
257 | seat_save(s); |
258 | ||
7f7bb946 | 259 | if (session) { |
98a28fef | 260 | session_save(session); |
7f7bb946 LP |
261 | user_save(session->user); |
262 | } | |
98a28fef | 263 | |
7f7bb946 | 264 | if (old_active) { |
98a28fef | 265 | session_save(old_active); |
78ab361c CG |
266 | if (!session || session->user != old_active->user) |
267 | user_save(old_active->user); | |
7f7bb946 | 268 | } |
98a28fef | 269 | |
9418f147 LP |
270 | return 0; |
271 | } | |
272 | ||
5eda94dd | 273 | int seat_active_vt_changed(Seat *s, int vtnr) { |
9418f147 LP |
274 | Session *i, *new_active = NULL; |
275 | int r; | |
20263082 LP |
276 | |
277 | assert(s); | |
278 | assert(vtnr >= 1); | |
20263082 | 279 | |
addedec4 | 280 | if (!seat_can_multi_session(s)) |
14c3baca LP |
281 | return -EINVAL; |
282 | ||
283 | log_debug("VT changed to %i", vtnr); | |
20263082 LP |
284 | |
285 | LIST_FOREACH(sessions_by_seat, i, s->sessions) | |
286 | if (i->vtnr == vtnr) { | |
14c3baca | 287 | new_active = i; |
20263082 LP |
288 | break; |
289 | } | |
290 | ||
9418f147 | 291 | r = seat_set_active(s, new_active); |
5eda94dd | 292 | manager_spawn_autovt(s->manager, vtnr); |
20263082 | 293 | |
9418f147 | 294 | return r; |
20263082 LP |
295 | } |
296 | ||
14c3baca LP |
297 | int seat_read_active_vt(Seat *s) { |
298 | char t[64]; | |
299 | ssize_t k; | |
300 | int r, vtnr; | |
301 | ||
302 | assert(s); | |
303 | ||
addedec4 | 304 | if (!seat_can_multi_session(s)) |
14c3baca LP |
305 | return 0; |
306 | ||
307 | lseek(s->manager->console_active_fd, SEEK_SET, 0); | |
308 | ||
309 | k = read(s->manager->console_active_fd, t, sizeof(t)-1); | |
310 | if (k <= 0) { | |
311 | log_error("Failed to read current console: %s", k < 0 ? strerror(-errno) : "EOF"); | |
312 | return k < 0 ? -errno : -EIO; | |
313 | } | |
314 | ||
315 | t[k] = 0; | |
316 | truncate_nl(t); | |
317 | ||
318 | if (!startswith(t, "tty")) { | |
319 | log_error("Hm, /sys/class/tty/tty0/active is badly formatted."); | |
320 | return -EIO; | |
321 | } | |
322 | ||
323 | r = safe_atoi(t+3, &vtnr); | |
324 | if (r < 0) { | |
325 | log_error("Failed to parse VT number %s", t+3); | |
326 | return r; | |
327 | } | |
328 | ||
329 | if (vtnr <= 0) { | |
330 | log_error("VT number invalid: %s", t+3); | |
331 | return -EIO; | |
332 | } | |
333 | ||
334 | return seat_active_vt_changed(s, vtnr); | |
335 | } | |
336 | ||
337 | int seat_start(Seat *s) { | |
338 | assert(s); | |
339 | ||
3f49d45a LP |
340 | if (s->started) |
341 | return 0; | |
342 | ||
877d54e9 | 343 | log_struct(LOG_INFO, |
1ca6783f | 344 | MESSAGE_ID(SD_MESSAGE_SEAT_START), |
877d54e9 LP |
345 | "SEAT_ID=%s", s->id, |
346 | "MESSAGE=New seat %s.", s->id, | |
347 | NULL); | |
3f49d45a | 348 | |
14c3baca LP |
349 | /* Initialize VT magic stuff */ |
350 | seat_preallocate_vts(s); | |
351 | ||
352 | /* Read current VT */ | |
353 | seat_read_active_vt(s); | |
354 | ||
7f7bb946 LP |
355 | s->started = true; |
356 | ||
14c3baca LP |
357 | /* Save seat data */ |
358 | seat_save(s); | |
359 | ||
da119395 LP |
360 | seat_send_signal(s, true); |
361 | ||
14c3baca LP |
362 | return 0; |
363 | } | |
364 | ||
20263082 | 365 | int seat_stop(Seat *s) { |
a185c5aa | 366 | int r = 0; |
20263082 LP |
367 | |
368 | assert(s); | |
369 | ||
ed18b08b | 370 | if (s->started) |
877d54e9 | 371 | log_struct(LOG_INFO, |
1ca6783f | 372 | MESSAGE_ID(SD_MESSAGE_SEAT_STOP), |
877d54e9 LP |
373 | "SEAT_ID=%s", s->id, |
374 | "MESSAGE=Removed seat %s.", s->id, | |
375 | NULL); | |
da119395 | 376 | |
a185c5aa LP |
377 | seat_stop_sessions(s); |
378 | ||
379 | unlink(s->state_file); | |
380 | seat_add_to_gc_queue(s); | |
381 | ||
ed18b08b LP |
382 | if (s->started) |
383 | seat_send_signal(s, false); | |
384 | ||
a185c5aa LP |
385 | s->started = false; |
386 | ||
387 | return r; | |
388 | } | |
389 | ||
390 | int seat_stop_sessions(Seat *s) { | |
391 | Session *session; | |
392 | int r = 0, k; | |
393 | ||
394 | assert(s); | |
395 | ||
20263082 | 396 | LIST_FOREACH(sessions_by_seat, session, s->sessions) { |
20263082 LP |
397 | k = session_stop(session); |
398 | if (k < 0) | |
399 | r = k; | |
400 | } | |
401 | ||
a185c5aa LP |
402 | return r; |
403 | } | |
14c3baca | 404 | |
a185c5aa LP |
405 | int seat_attach_session(Seat *s, Session *session) { |
406 | assert(s); | |
407 | assert(session); | |
408 | assert(!session->seat); | |
3f49d45a | 409 | |
a185c5aa LP |
410 | session->seat = s; |
411 | LIST_PREPEND(Session, sessions_by_seat, s->sessions, session); | |
412 | ||
9418f147 LP |
413 | seat_send_changed(s, "Sessions\0"); |
414 | ||
abc5bbc6 LP |
415 | /* Note that even if a seat is not multi-session capable it |
416 | * still might have multiple sessions on it since old, dead | |
417 | * sessions might continue to be tracked until all their | |
418 | * processes are gone. The most recently added session | |
419 | * (i.e. the first in s->sessions) is the one that matters. */ | |
420 | ||
421 | if (!seat_can_multi_session(s)) | |
9418f147 | 422 | seat_set_active(s, session); |
9418f147 | 423 | |
a185c5aa LP |
424 | return 0; |
425 | } | |
426 | ||
92432fcc | 427 | bool seat_is_seat0(Seat *s) { |
a185c5aa LP |
428 | assert(s); |
429 | ||
92432fcc | 430 | return s->manager->seat0 == s; |
a185c5aa LP |
431 | } |
432 | ||
addedec4 LP |
433 | bool seat_can_multi_session(Seat *s) { |
434 | assert(s); | |
435 | ||
92432fcc | 436 | if (!seat_is_seat0(s)) |
addedec4 LP |
437 | return false; |
438 | ||
439 | /* If we can't watch which VT is in the foreground, we don't | |
440 | * support VT switching */ | |
441 | ||
442 | return s->manager->console_active_fd >= 0; | |
443 | } | |
444 | ||
f1a8e221 LP |
445 | bool seat_can_tty(Seat *s) { |
446 | assert(s); | |
447 | ||
20e1bd9d | 448 | return seat_is_seat0(s) && s->manager->console_active_fd >= 0; |
f1a8e221 LP |
449 | } |
450 | ||
718d006a DH |
451 | bool seat_has_master_device(Seat *s) { |
452 | assert(s); | |
453 | ||
454 | /* device list is ordered by "master" flag */ | |
455 | return !!s->devices && s->devices->master; | |
456 | } | |
457 | ||
f1a8e221 LP |
458 | bool seat_can_graphical(Seat *s) { |
459 | assert(s); | |
460 | ||
718d006a | 461 | return seat_has_master_device(s); |
f1a8e221 LP |
462 | } |
463 | ||
a185c5aa LP |
464 | int seat_get_idle_hint(Seat *s, dual_timestamp *t) { |
465 | Session *session; | |
466 | bool idle_hint = true; | |
467 | dual_timestamp ts = { 0, 0 }; | |
468 | ||
469 | assert(s); | |
470 | ||
471 | LIST_FOREACH(sessions_by_seat, session, s->sessions) { | |
472 | dual_timestamp k; | |
473 | int ih; | |
474 | ||
475 | ih = session_get_idle_hint(session, &k); | |
476 | if (ih < 0) | |
477 | return ih; | |
478 | ||
479 | if (!ih) { | |
480 | if (!idle_hint) { | |
4a271908 | 481 | if (k.monotonic > ts.monotonic) |
a185c5aa LP |
482 | ts = k; |
483 | } else { | |
484 | idle_hint = false; | |
485 | ts = k; | |
486 | } | |
487 | } else if (idle_hint) { | |
488 | ||
489 | if (k.monotonic > ts.monotonic) | |
490 | ts = k; | |
491 | } | |
492 | } | |
493 | ||
494 | if (t) | |
495 | *t = ts; | |
496 | ||
497 | return idle_hint; | |
20263082 | 498 | } |
14c3baca | 499 | |
4a4b033f | 500 | int seat_check_gc(Seat *s, bool drop_not_started) { |
14c3baca LP |
501 | assert(s); |
502 | ||
4a4b033f | 503 | if (drop_not_started && !s->started) |
932e3ee7 LP |
504 | return 0; |
505 | ||
92432fcc | 506 | if (seat_is_seat0(s)) |
14c3baca LP |
507 | return 1; |
508 | ||
718d006a | 509 | return seat_has_master_device(s); |
14c3baca LP |
510 | } |
511 | ||
512 | void seat_add_to_gc_queue(Seat *s) { | |
513 | assert(s); | |
514 | ||
515 | if (s->in_gc_queue) | |
516 | return; | |
517 | ||
518 | LIST_PREPEND(Seat, gc_queue, s->manager->seat_gc_queue, s); | |
519 | s->in_gc_queue = true; | |
520 | } | |
3f49d45a LP |
521 | |
522 | static bool seat_name_valid_char(char c) { | |
523 | return | |
524 | (c >= 'a' && c <= 'z') || | |
525 | (c >= 'A' && c <= 'Z') || | |
526 | (c >= '0' && c <= '9') || | |
527 | c == '-' || | |
528 | c == '_'; | |
529 | } | |
530 | ||
531 | bool seat_name_is_valid(const char *name) { | |
532 | const char *p; | |
533 | ||
534 | assert(name); | |
535 | ||
536 | if (!startswith(name, "seat")) | |
537 | return false; | |
538 | ||
539 | if (!name[4]) | |
540 | return false; | |
541 | ||
542 | for (p = name; *p; p++) | |
543 | if (!seat_name_valid_char(*p)) | |
544 | return false; | |
545 | ||
1c9a2c10 LP |
546 | if (strlen(name) > 255) |
547 | return false; | |
548 | ||
3f49d45a LP |
549 | return true; |
550 | } |