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