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