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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 | |
9 | under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
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 | |
16 | General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
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 LP |
32 | #include "util.h" |
33 | ||
34 | Seat *seat_new(Manager *m, const char *id) { | |
35 | Seat *s; | |
36 | ||
37 | assert(m); | |
38 | assert(id); | |
39 | ||
40 | s = new0(Seat, 1); | |
41 | if (!s) | |
42 | return NULL; | |
43 | ||
98a28fef | 44 | s->state_file = strappend("/run/systemd/seats/", id); |
20263082 LP |
45 | if (!s->state_file) { |
46 | free(s); | |
47 | return NULL; | |
48 | } | |
49 | ||
50 | s->id = file_name_from_path(s->state_file); | |
14c3baca | 51 | s->manager = m; |
20263082 LP |
52 | |
53 | if (hashmap_put(m->seats, s->id, s) < 0) { | |
14c3baca | 54 | free(s->state_file); |
20263082 LP |
55 | free(s); |
56 | return NULL; | |
57 | } | |
58 | ||
20263082 LP |
59 | return s; |
60 | } | |
61 | ||
62 | void seat_free(Seat *s) { | |
63 | assert(s); | |
64 | ||
14c3baca LP |
65 | if (s->in_gc_queue) |
66 | LIST_REMOVE(Seat, gc_queue, s->manager->seat_gc_queue, s); | |
67 | ||
20263082 LP |
68 | while (s->sessions) |
69 | session_free(s->sessions); | |
70 | ||
71 | assert(!s->active); | |
72 | ||
73 | while (s->devices) | |
74 | device_free(s->devices); | |
75 | ||
76 | hashmap_remove(s->manager->seats, s->id); | |
77 | ||
d2f92cdf | 78 | free(s->state_file); |
20263082 LP |
79 | free(s); |
80 | } | |
81 | ||
82 | int seat_save(Seat *s) { | |
20263082 | 83 | int r; |
14c3baca LP |
84 | FILE *f; |
85 | char *temp_path; | |
20263082 LP |
86 | |
87 | assert(s); | |
88 | ||
accaeded LP |
89 | if (!s->started) |
90 | return 0; | |
91 | ||
98a28fef | 92 | r = safe_mkdir("/run/systemd/seats", 0755, 0, 0); |
20263082 | 93 | if (r < 0) |
14c3baca LP |
94 | goto finish; |
95 | ||
96 | r = fopen_temporary(s->state_file, &f, &temp_path); | |
97 | if (r < 0) | |
98 | goto finish; | |
20263082 | 99 | |
14c3baca | 100 | fchmod(fileno(f), 0644); |
20263082 LP |
101 | |
102 | fprintf(f, | |
14c3baca | 103 | "# This is private data. Do not parse.\n" |
addedec4 LP |
104 | "IS_VTCONSOLE=%i\n" |
105 | "CAN_MULTI_SESSION=%i\n", | |
106 | seat_is_vtconsole(s), | |
107 | seat_can_multi_session(s)); | |
20263082 LP |
108 | |
109 | if (s->active) { | |
110 | assert(s->active->user); | |
111 | ||
112 | fprintf(f, | |
113 | "ACTIVE=%s\n" | |
114 | "ACTIVE_UID=%lu\n", | |
115 | s->active->id, | |
116 | (unsigned long) s->active->user->uid); | |
117 | } | |
118 | ||
119 | if (s->sessions) { | |
120 | Session *i; | |
20263082 | 121 | |
fde78a3a | 122 | fputs("SESSIONS=", f); |
20263082 | 123 | LIST_FOREACH(sessions_by_seat, i, s->sessions) { |
14c3baca LP |
124 | fprintf(f, |
125 | "%s%c", | |
126 | i->id, | |
127 | i->sessions_by_seat_next ? ' ' : '\n'); | |
128 | } | |
20263082 | 129 | |
fde78a3a LP |
130 | fputs("UIDS=", f); |
131 | LIST_FOREACH(sessions_by_seat, i, s->sessions) | |
20263082 | 132 | fprintf(f, |
14c3baca LP |
133 | "%lu%c", |
134 | (unsigned long) i->user->uid, | |
135 | i->sessions_by_seat_next ? ' ' : '\n'); | |
20263082 LP |
136 | } |
137 | ||
138 | fflush(f); | |
14c3baca LP |
139 | |
140 | if (ferror(f) || rename(temp_path, s->state_file) < 0) { | |
20263082 LP |
141 | r = -errno; |
142 | unlink(s->state_file); | |
14c3baca | 143 | unlink(temp_path); |
20263082 LP |
144 | } |
145 | ||
146 | fclose(f); | |
14c3baca LP |
147 | free(temp_path); |
148 | ||
149 | finish: | |
150 | if (r < 0) | |
151 | log_error("Failed to save seat data for %s: %s", s->id, strerror(-r)); | |
152 | ||
20263082 LP |
153 | return r; |
154 | } | |
155 | ||
156 | int seat_load(Seat *s) { | |
157 | assert(s); | |
158 | ||
a185c5aa LP |
159 | /* There isn't actually anything to read here ... */ |
160 | ||
20263082 LP |
161 | return 0; |
162 | } | |
163 | ||
164 | static int vt_allocate(int vtnr) { | |
165 | int fd, r; | |
166 | char *p; | |
167 | ||
168 | assert(vtnr >= 1); | |
169 | ||
170 | if (asprintf(&p, "/dev/tty%i", vtnr) < 0) | |
171 | return -ENOMEM; | |
172 | ||
173 | fd = open_terminal(p, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
174 | free(p); | |
175 | ||
176 | r = fd < 0 ? -errno : 0; | |
177 | ||
178 | if (fd >= 0) | |
179 | close_nointr_nofail(fd); | |
180 | ||
181 | return r; | |
182 | } | |
183 | ||
30ed21ce | 184 | int seat_preallocate_vts(Seat *s) { |
3f49d45a LP |
185 | int r = 0; |
186 | unsigned i; | |
20263082 LP |
187 | |
188 | assert(s); | |
189 | assert(s->manager); | |
190 | ||
30ed21ce LP |
191 | log_debug("Preallocating VTs..."); |
192 | ||
20263082 LP |
193 | if (s->manager->n_autovts <= 0) |
194 | return 0; | |
195 | ||
addedec4 | 196 | if (!seat_can_multi_session(s)) |
20263082 LP |
197 | return 0; |
198 | ||
e7886786 | 199 | for (i = 1; i <= s->manager->n_autovts; i++) { |
20263082 LP |
200 | int q; |
201 | ||
202 | q = vt_allocate(i); | |
14c3baca LP |
203 | if (q < 0) { |
204 | log_error("Failed to preallocate VT %i: %s", i, strerror(-q)); | |
20263082 | 205 | r = q; |
14c3baca | 206 | } |
20263082 LP |
207 | } |
208 | ||
209 | return r; | |
210 | } | |
211 | ||
5eda94dd LP |
212 | int seat_apply_acls(Seat *s, Session *old_active) { |
213 | int r; | |
20263082 | 214 | |
5eda94dd | 215 | assert(s); |
20263082 | 216 | |
5eda94dd LP |
217 | r = devnode_acl_all(s->manager->udev, |
218 | s->id, | |
219 | false, | |
220 | !!old_active, old_active ? old_active->user->uid : 0, | |
221 | !!s->active, s->active ? s->active->user->uid : 0); | |
20263082 | 222 | |
5eda94dd LP |
223 | if (r < 0) |
224 | log_error("Failed to apply ACLs: %s", strerror(-r)); | |
20263082 LP |
225 | |
226 | return r; | |
227 | } | |
228 | ||
9418f147 LP |
229 | int seat_set_active(Seat *s, Session *session) { |
230 | Session *old_active; | |
231 | ||
232 | assert(s); | |
77527da0 | 233 | assert(!session || session->seat == s); |
9418f147 LP |
234 | |
235 | if (session == s->active) | |
236 | return 0; | |
237 | ||
238 | old_active = s->active; | |
239 | s->active = session; | |
240 | ||
241 | seat_apply_acls(s, old_active); | |
242 | ||
243 | if (session && session->started) | |
244 | session_send_changed(session, "Active\0"); | |
245 | ||
246 | if (!session || session->started) | |
247 | seat_send_changed(s, "ActiveSession\0"); | |
248 | ||
98a28fef LP |
249 | seat_save(s); |
250 | ||
7f7bb946 | 251 | if (session) { |
98a28fef | 252 | session_save(session); |
7f7bb946 LP |
253 | user_save(session->user); |
254 | } | |
98a28fef | 255 | |
7f7bb946 | 256 | if (old_active) { |
98a28fef | 257 | session_save(old_active); |
7f7bb946 LP |
258 | user_save(old_active->user); |
259 | } | |
98a28fef | 260 | |
9418f147 LP |
261 | return 0; |
262 | } | |
263 | ||
5eda94dd | 264 | int seat_active_vt_changed(Seat *s, int vtnr) { |
9418f147 LP |
265 | Session *i, *new_active = NULL; |
266 | int r; | |
20263082 LP |
267 | |
268 | assert(s); | |
269 | assert(vtnr >= 1); | |
20263082 | 270 | |
addedec4 | 271 | if (!seat_can_multi_session(s)) |
14c3baca LP |
272 | return -EINVAL; |
273 | ||
274 | log_debug("VT changed to %i", vtnr); | |
20263082 LP |
275 | |
276 | LIST_FOREACH(sessions_by_seat, i, s->sessions) | |
277 | if (i->vtnr == vtnr) { | |
14c3baca | 278 | new_active = i; |
20263082 LP |
279 | break; |
280 | } | |
281 | ||
9418f147 | 282 | r = seat_set_active(s, new_active); |
5eda94dd | 283 | manager_spawn_autovt(s->manager, vtnr); |
20263082 | 284 | |
9418f147 | 285 | return r; |
20263082 LP |
286 | } |
287 | ||
14c3baca LP |
288 | int seat_read_active_vt(Seat *s) { |
289 | char t[64]; | |
290 | ssize_t k; | |
291 | int r, vtnr; | |
292 | ||
293 | assert(s); | |
294 | ||
addedec4 | 295 | if (!seat_can_multi_session(s)) |
14c3baca LP |
296 | return 0; |
297 | ||
298 | lseek(s->manager->console_active_fd, SEEK_SET, 0); | |
299 | ||
300 | k = read(s->manager->console_active_fd, t, sizeof(t)-1); | |
301 | if (k <= 0) { | |
302 | log_error("Failed to read current console: %s", k < 0 ? strerror(-errno) : "EOF"); | |
303 | return k < 0 ? -errno : -EIO; | |
304 | } | |
305 | ||
306 | t[k] = 0; | |
307 | truncate_nl(t); | |
308 | ||
309 | if (!startswith(t, "tty")) { | |
310 | log_error("Hm, /sys/class/tty/tty0/active is badly formatted."); | |
311 | return -EIO; | |
312 | } | |
313 | ||
314 | r = safe_atoi(t+3, &vtnr); | |
315 | if (r < 0) { | |
316 | log_error("Failed to parse VT number %s", t+3); | |
317 | return r; | |
318 | } | |
319 | ||
320 | if (vtnr <= 0) { | |
321 | log_error("VT number invalid: %s", t+3); | |
322 | return -EIO; | |
323 | } | |
324 | ||
325 | return seat_active_vt_changed(s, vtnr); | |
326 | } | |
327 | ||
328 | int seat_start(Seat *s) { | |
329 | assert(s); | |
330 | ||
3f49d45a LP |
331 | if (s->started) |
332 | return 0; | |
333 | ||
334 | log_info("New seat %s.", s->id); | |
335 | ||
14c3baca LP |
336 | /* Initialize VT magic stuff */ |
337 | seat_preallocate_vts(s); | |
338 | ||
339 | /* Read current VT */ | |
340 | seat_read_active_vt(s); | |
341 | ||
7f7bb946 LP |
342 | s->started = true; |
343 | ||
14c3baca LP |
344 | /* Save seat data */ |
345 | seat_save(s); | |
346 | ||
da119395 LP |
347 | seat_send_signal(s, true); |
348 | ||
14c3baca LP |
349 | return 0; |
350 | } | |
351 | ||
20263082 | 352 | int seat_stop(Seat *s) { |
a185c5aa | 353 | int r = 0; |
20263082 LP |
354 | |
355 | assert(s); | |
356 | ||
ed18b08b LP |
357 | if (s->started) |
358 | log_info("Removed seat %s.", s->id); | |
da119395 | 359 | |
a185c5aa LP |
360 | seat_stop_sessions(s); |
361 | ||
362 | unlink(s->state_file); | |
363 | seat_add_to_gc_queue(s); | |
364 | ||
ed18b08b LP |
365 | if (s->started) |
366 | seat_send_signal(s, false); | |
367 | ||
a185c5aa LP |
368 | s->started = false; |
369 | ||
370 | return r; | |
371 | } | |
372 | ||
373 | int seat_stop_sessions(Seat *s) { | |
374 | Session *session; | |
375 | int r = 0, k; | |
376 | ||
377 | assert(s); | |
378 | ||
20263082 | 379 | LIST_FOREACH(sessions_by_seat, session, s->sessions) { |
20263082 LP |
380 | k = session_stop(session); |
381 | if (k < 0) | |
382 | r = k; | |
383 | } | |
384 | ||
a185c5aa LP |
385 | return r; |
386 | } | |
14c3baca | 387 | |
a185c5aa LP |
388 | int seat_attach_session(Seat *s, Session *session) { |
389 | assert(s); | |
390 | assert(session); | |
391 | assert(!session->seat); | |
3f49d45a | 392 | |
a185c5aa LP |
393 | session->seat = s; |
394 | LIST_PREPEND(Session, sessions_by_seat, s->sessions, session); | |
395 | ||
9418f147 LP |
396 | seat_send_changed(s, "Sessions\0"); |
397 | ||
abc5bbc6 LP |
398 | /* Note that even if a seat is not multi-session capable it |
399 | * still might have multiple sessions on it since old, dead | |
400 | * sessions might continue to be tracked until all their | |
401 | * processes are gone. The most recently added session | |
402 | * (i.e. the first in s->sessions) is the one that matters. */ | |
403 | ||
404 | if (!seat_can_multi_session(s)) | |
9418f147 | 405 | seat_set_active(s, session); |
9418f147 | 406 | |
a185c5aa LP |
407 | return 0; |
408 | } | |
409 | ||
410 | bool seat_is_vtconsole(Seat *s) { | |
411 | assert(s); | |
412 | ||
413 | return s->manager->vtconsole == s; | |
414 | } | |
415 | ||
addedec4 LP |
416 | bool seat_can_multi_session(Seat *s) { |
417 | assert(s); | |
418 | ||
419 | if (!seat_is_vtconsole(s)) | |
420 | return false; | |
421 | ||
422 | /* If we can't watch which VT is in the foreground, we don't | |
423 | * support VT switching */ | |
424 | ||
425 | return s->manager->console_active_fd >= 0; | |
426 | } | |
427 | ||
a185c5aa LP |
428 | int seat_get_idle_hint(Seat *s, dual_timestamp *t) { |
429 | Session *session; | |
430 | bool idle_hint = true; | |
431 | dual_timestamp ts = { 0, 0 }; | |
432 | ||
433 | assert(s); | |
434 | ||
435 | LIST_FOREACH(sessions_by_seat, session, s->sessions) { | |
436 | dual_timestamp k; | |
437 | int ih; | |
438 | ||
439 | ih = session_get_idle_hint(session, &k); | |
440 | if (ih < 0) | |
441 | return ih; | |
442 | ||
443 | if (!ih) { | |
444 | if (!idle_hint) { | |
445 | if (k.monotonic < ts.monotonic) | |
446 | ts = k; | |
447 | } else { | |
448 | idle_hint = false; | |
449 | ts = k; | |
450 | } | |
451 | } else if (idle_hint) { | |
452 | ||
453 | if (k.monotonic > ts.monotonic) | |
454 | ts = k; | |
455 | } | |
456 | } | |
457 | ||
458 | if (t) | |
459 | *t = ts; | |
460 | ||
461 | return idle_hint; | |
20263082 | 462 | } |
14c3baca | 463 | |
4a4b033f | 464 | int seat_check_gc(Seat *s, bool drop_not_started) { |
14c3baca LP |
465 | assert(s); |
466 | ||
4a4b033f | 467 | if (drop_not_started && !s->started) |
932e3ee7 LP |
468 | return 0; |
469 | ||
a185c5aa | 470 | if (seat_is_vtconsole(s)) |
14c3baca LP |
471 | return 1; |
472 | ||
473 | return !!s->devices; | |
474 | } | |
475 | ||
476 | void seat_add_to_gc_queue(Seat *s) { | |
477 | assert(s); | |
478 | ||
479 | if (s->in_gc_queue) | |
480 | return; | |
481 | ||
482 | LIST_PREPEND(Seat, gc_queue, s->manager->seat_gc_queue, s); | |
483 | s->in_gc_queue = true; | |
484 | } | |
3f49d45a LP |
485 | |
486 | static bool seat_name_valid_char(char c) { | |
487 | return | |
488 | (c >= 'a' && c <= 'z') || | |
489 | (c >= 'A' && c <= 'Z') || | |
490 | (c >= '0' && c <= '9') || | |
491 | c == '-' || | |
492 | c == '_'; | |
493 | } | |
494 | ||
495 | bool seat_name_is_valid(const char *name) { | |
496 | const char *p; | |
497 | ||
498 | assert(name); | |
499 | ||
500 | if (!startswith(name, "seat")) | |
501 | return false; | |
502 | ||
503 | if (!name[4]) | |
504 | return false; | |
505 | ||
506 | for (p = name; *p; p++) | |
507 | if (!seat_name_valid_char(*p)) | |
508 | return false; | |
509 | ||
1c9a2c10 LP |
510 | if (strlen(name) > 255) |
511 | return false; | |
512 | ||
3f49d45a LP |
513 | return true; |
514 | } |