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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 <errno.h> | |
90a18413 DH |
23 | #include <fcntl.h> |
24 | #include <linux/vt.h> | |
25 | #include <linux/kd.h> | |
26 | #include <signal.h> | |
20263082 | 27 | #include <string.h> |
90a18413 | 28 | #include <sys/ioctl.h> |
20263082 LP |
29 | #include <unistd.h> |
30 | ||
cc377381 LP |
31 | #include "sd-id128.h" |
32 | #include "sd-messages.h" | |
20263082 LP |
33 | #include "strv.h" |
34 | #include "util.h" | |
49e942b2 | 35 | #include "mkdir.h" |
9eb977db | 36 | #include "path-util.h" |
a5c32cff | 37 | #include "fileio.h" |
cc377381 LP |
38 | #include "audit.h" |
39 | #include "bus-util.h" | |
40 | #include "bus-error.h" | |
fb6becb4 | 41 | #include "logind-session.h" |
20263082 | 42 | |
9bf3b535 | 43 | static unsigned long devt_hash_func(const void *p, const uint8_t hash_key[HASH_KEY_SIZE]) { |
831dedef DH |
44 | uint64_t u = *(const dev_t*)p; |
45 | ||
9bf3b535 | 46 | return uint64_hash_func(&u, hash_key); |
831dedef DH |
47 | } |
48 | ||
49 | static int devt_compare_func(const void *_a, const void *_b) { | |
50 | dev_t a, b; | |
51 | ||
52 | a = *(const dev_t*) _a; | |
53 | b = *(const dev_t*) _b; | |
54 | ||
55 | return a < b ? -1 : (a > b ? 1 : 0); | |
56 | } | |
57 | ||
9444b1f2 | 58 | Session* session_new(Manager *m, const char *id) { |
20263082 LP |
59 | Session *s; |
60 | ||
61 | assert(m); | |
62 | assert(id); | |
4b549144 | 63 | assert(session_id_valid(id)); |
20263082 | 64 | |
14c3baca | 65 | s = new0(Session, 1); |
20263082 LP |
66 | if (!s) |
67 | return NULL; | |
68 | ||
98a28fef | 69 | s->state_file = strappend("/run/systemd/sessions/", id); |
20263082 LP |
70 | if (!s->state_file) { |
71 | free(s); | |
72 | return NULL; | |
73 | } | |
74 | ||
831dedef | 75 | s->devices = hashmap_new(devt_hash_func, devt_compare_func); |
118ecf32 DH |
76 | if (!s->devices) { |
77 | free(s->state_file); | |
78 | free(s); | |
79 | return NULL; | |
80 | } | |
81 | ||
2b6bf07d | 82 | s->id = basename(s->state_file); |
20263082 LP |
83 | |
84 | if (hashmap_put(m->sessions, s->id, s) < 0) { | |
118ecf32 | 85 | hashmap_free(s->devices); |
f8e2fb7b | 86 | free(s->state_file); |
20263082 LP |
87 | free(s); |
88 | return NULL; | |
89 | } | |
90 | ||
91 | s->manager = m; | |
932e3ee7 | 92 | s->fifo_fd = -1; |
90a18413 | 93 | s->vtfd = -1; |
20263082 LP |
94 | |
95 | return s; | |
96 | } | |
97 | ||
98 | void session_free(Session *s) { | |
118ecf32 DH |
99 | SessionDevice *sd; |
100 | ||
20263082 LP |
101 | assert(s); |
102 | ||
14c3baca | 103 | if (s->in_gc_queue) |
71fda00f | 104 | LIST_REMOVE(gc_queue, s->manager->session_gc_queue, s); |
14c3baca | 105 | |
cc377381 LP |
106 | session_remove_fifo(s); |
107 | ||
ae5e06bd DH |
108 | session_drop_controller(s); |
109 | ||
118ecf32 DH |
110 | while ((sd = hashmap_first(s->devices))) |
111 | session_device_free(sd); | |
112 | ||
113 | hashmap_free(s->devices); | |
114 | ||
20263082 | 115 | if (s->user) { |
71fda00f | 116 | LIST_REMOVE(sessions_by_user, s->user->sessions, s); |
20263082 LP |
117 | |
118 | if (s->user->display == s) | |
119 | s->user->display = NULL; | |
120 | } | |
121 | ||
9418f147 LP |
122 | if (s->seat) { |
123 | if (s->seat->active == s) | |
124 | s->seat->active = NULL; | |
d7bd01b5 DH |
125 | if (s->seat->pending_switch == s) |
126 | s->seat->pending_switch = NULL; | |
9418f147 | 127 | |
49e6fdbf | 128 | seat_evict_position(s->seat, s); |
71fda00f | 129 | LIST_REMOVE(sessions_by_seat, s->seat->sessions, s); |
9418f147 | 130 | } |
20263082 | 131 | |
fb6becb4 LP |
132 | if (s->scope) { |
133 | hashmap_remove(s->manager->session_units, s->scope); | |
134 | free(s->scope); | |
135 | } | |
136 | ||
137 | free(s->scope_job); | |
1713813d | 138 | |
cc377381 | 139 | sd_bus_message_unref(s->create_message); |
20263082 LP |
140 | |
141 | free(s->tty); | |
142 | free(s->display); | |
143 | free(s->remote_host); | |
3f49d45a | 144 | free(s->remote_user); |
98a28fef | 145 | free(s->service); |
a4cd87e9 | 146 | free(s->desktop); |
20263082 LP |
147 | |
148 | hashmap_remove(s->manager->sessions, s->id); | |
98a28fef | 149 | |
d2f92cdf | 150 | free(s->state_file); |
20263082 LP |
151 | free(s); |
152 | } | |
153 | ||
9444b1f2 LP |
154 | void session_set_user(Session *s, User *u) { |
155 | assert(s); | |
156 | assert(!s->user); | |
157 | ||
158 | s->user = u; | |
71fda00f | 159 | LIST_PREPEND(sessions_by_user, u->sessions, s); |
9444b1f2 LP |
160 | } |
161 | ||
20263082 | 162 | int session_save(Session *s) { |
507f22bd | 163 | _cleanup_free_ char *temp_path = NULL; |
cc377381 | 164 | _cleanup_fclose_ FILE *f = NULL; |
20263082 LP |
165 | int r = 0; |
166 | ||
167 | assert(s); | |
168 | ||
9444b1f2 LP |
169 | if (!s->user) |
170 | return -ESTALE; | |
171 | ||
accaeded LP |
172 | if (!s->started) |
173 | return 0; | |
174 | ||
d2e54fae | 175 | r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0); |
20263082 | 176 | if (r < 0) |
14c3baca | 177 | goto finish; |
20263082 | 178 | |
14c3baca LP |
179 | r = fopen_temporary(s->state_file, &f, &temp_path); |
180 | if (r < 0) | |
181 | goto finish; | |
20263082 LP |
182 | |
183 | assert(s->user); | |
184 | ||
14c3baca LP |
185 | fchmod(fileno(f), 0644); |
186 | ||
20263082 LP |
187 | fprintf(f, |
188 | "# This is private data. Do not parse.\n" | |
90b2de37 | 189 | "UID="UID_FMT"\n" |
20263082 LP |
190 | "USER=%s\n" |
191 | "ACTIVE=%i\n" | |
0604381b | 192 | "STATE=%s\n" |
fb6becb4 | 193 | "REMOTE=%i\n", |
90b2de37 | 194 | s->user->uid, |
20263082 LP |
195 | s->user->name, |
196 | session_is_active(s), | |
0604381b | 197 | session_state_to_string(session_get_state(s)), |
fb6becb4 | 198 | s->remote); |
20263082 | 199 | |
a91e4e53 | 200 | if (s->type >= 0) |
507f22bd | 201 | fprintf(f, "TYPE=%s\n", session_type_to_string(s->type)); |
a91e4e53 | 202 | |
55efac6c | 203 | if (s->class >= 0) |
507f22bd | 204 | fprintf(f, "CLASS=%s\n", session_class_to_string(s->class)); |
55efac6c | 205 | |
fb6becb4 LP |
206 | if (s->scope) |
207 | fprintf(f, "SCOPE=%s\n", s->scope); | |
208 | ||
209 | if (s->scope_job) | |
210 | fprintf(f, "SCOPE_JOB=%s\n", s->scope_job); | |
20263082 | 211 | |
932e3ee7 | 212 | if (s->fifo_path) |
507f22bd | 213 | fprintf(f, "FIFO=%s\n", s->fifo_path); |
932e3ee7 | 214 | |
20263082 | 215 | if (s->seat) |
507f22bd | 216 | fprintf(f, "SEAT=%s\n", s->seat->id); |
20263082 LP |
217 | |
218 | if (s->tty) | |
507f22bd | 219 | fprintf(f, "TTY=%s\n", s->tty); |
20263082 LP |
220 | |
221 | if (s->display) | |
507f22bd | 222 | fprintf(f, "DISPLAY=%s\n", s->display); |
20263082 LP |
223 | |
224 | if (s->remote_host) | |
507f22bd | 225 | fprintf(f, "REMOTE_HOST=%s\n", s->remote_host); |
20263082 | 226 | |
3f49d45a | 227 | if (s->remote_user) |
507f22bd | 228 | fprintf(f, "REMOTE_USER=%s\n", s->remote_user); |
3f49d45a | 229 | |
98a28fef | 230 | if (s->service) |
507f22bd | 231 | fprintf(f, "SERVICE=%s\n", s->service); |
98a28fef | 232 | |
a4cd87e9 LP |
233 | if (s->desktop) |
234 | fprintf(f, "DESKTOP=%s\n", s->desktop); | |
235 | ||
bf7825ae | 236 | if (s->seat && seat_has_vts(s->seat)) |
92bd5ff3 | 237 | fprintf(f, "VTNR=%u\n", s->vtnr); |
20263082 | 238 | |
49e6fdbf DH |
239 | if (!s->vtnr) |
240 | fprintf(f, "POS=%u\n", s->pos); | |
241 | ||
20263082 | 242 | if (s->leader > 0) |
90b2de37 | 243 | fprintf(f, "LEADER="PID_FMT"\n", s->leader); |
20263082 LP |
244 | |
245 | if (s->audit_id > 0) | |
507f22bd | 246 | fprintf(f, "AUDIT=%"PRIu32"\n", s->audit_id); |
20263082 | 247 | |
9444b1f2 LP |
248 | if (dual_timestamp_is_set(&s->timestamp)) |
249 | fprintf(f, | |
90b2de37 ZJS |
250 | "REALTIME="USEC_FMT"\n" |
251 | "MONOTONIC="USEC_FMT"\n", | |
252 | s->timestamp.realtime, | |
253 | s->timestamp.monotonic); | |
9444b1f2 | 254 | |
6d33772f DH |
255 | if (s->controller) |
256 | fprintf(f, "CONTROLLER=%s\n", s->controller); | |
257 | ||
20263082 | 258 | fflush(f); |
14c3baca LP |
259 | |
260 | if (ferror(f) || rename(temp_path, s->state_file) < 0) { | |
20263082 LP |
261 | r = -errno; |
262 | unlink(s->state_file); | |
14c3baca | 263 | unlink(temp_path); |
20263082 LP |
264 | } |
265 | ||
14c3baca LP |
266 | finish: |
267 | if (r < 0) | |
90b2de37 | 268 | log_error("Failed to save session data %s: %s", s->state_file, strerror(-r)); |
14c3baca | 269 | |
20263082 LP |
270 | return r; |
271 | } | |
272 | ||
273 | int session_load(Session *s) { | |
9444b1f2 | 274 | _cleanup_free_ char *remote = NULL, |
a185c5aa LP |
275 | *seat = NULL, |
276 | *vtnr = NULL, | |
49e6fdbf | 277 | *pos = NULL, |
a185c5aa | 278 | *leader = NULL, |
55efac6c | 279 | *type = NULL, |
9444b1f2 LP |
280 | *class = NULL, |
281 | *uid = NULL, | |
282 | *realtime = NULL, | |
6d33772f DH |
283 | *monotonic = NULL, |
284 | *controller = NULL; | |
a185c5aa LP |
285 | |
286 | int k, r; | |
287 | ||
20263082 LP |
288 | assert(s); |
289 | ||
a185c5aa LP |
290 | r = parse_env_file(s->state_file, NEWLINE, |
291 | "REMOTE", &remote, | |
fb6becb4 LP |
292 | "SCOPE", &s->scope, |
293 | "SCOPE_JOB", &s->scope_job, | |
932e3ee7 | 294 | "FIFO", &s->fifo_path, |
a185c5aa LP |
295 | "SEAT", &seat, |
296 | "TTY", &s->tty, | |
297 | "DISPLAY", &s->display, | |
298 | "REMOTE_HOST", &s->remote_host, | |
299 | "REMOTE_USER", &s->remote_user, | |
98a28fef | 300 | "SERVICE", &s->service, |
a4cd87e9 | 301 | "DESKTOP", &s->desktop, |
a185c5aa | 302 | "VTNR", &vtnr, |
49e6fdbf | 303 | "POS", &pos, |
a185c5aa | 304 | "LEADER", &leader, |
a91e4e53 | 305 | "TYPE", &type, |
55efac6c | 306 | "CLASS", &class, |
9444b1f2 LP |
307 | "UID", &uid, |
308 | "REALTIME", &realtime, | |
309 | "MONOTONIC", &monotonic, | |
6d33772f | 310 | "CONTROLLER", &controller, |
a185c5aa LP |
311 | NULL); |
312 | ||
9444b1f2 LP |
313 | if (r < 0) { |
314 | log_error("Failed to read %s: %s", s->state_file, strerror(-r)); | |
315 | return r; | |
316 | } | |
317 | ||
318 | if (!s->user) { | |
319 | uid_t u; | |
320 | User *user; | |
321 | ||
322 | if (!uid) { | |
323 | log_error("UID not specified for session %s", s->id); | |
324 | return -ENOENT; | |
325 | } | |
326 | ||
327 | r = parse_uid(uid, &u); | |
328 | if (r < 0) { | |
329 | log_error("Failed to parse UID value %s for session %s.", uid, s->id); | |
330 | return r; | |
331 | } | |
332 | ||
333 | user = hashmap_get(s->manager->users, ULONG_TO_PTR((unsigned long) u)); | |
334 | if (!user) { | |
335 | log_error("User of session %s not known.", s->id); | |
336 | return -ENOENT; | |
337 | } | |
338 | ||
339 | session_set_user(s, user); | |
340 | } | |
a185c5aa LP |
341 | |
342 | if (remote) { | |
343 | k = parse_boolean(remote); | |
344 | if (k >= 0) | |
345 | s->remote = k; | |
346 | } | |
347 | ||
c506027a DH |
348 | if (vtnr) |
349 | safe_atou(vtnr, &s->vtnr); | |
350 | ||
9418f147 | 351 | if (seat && !s->seat) { |
a185c5aa LP |
352 | Seat *o; |
353 | ||
354 | o = hashmap_get(s->manager->seats, seat); | |
355 | if (o) | |
c506027a DH |
356 | r = seat_attach_session(o, s); |
357 | if (!o || r < 0) | |
358 | log_error("Cannot attach session %s to seat %s", s->id, seat); | |
a185c5aa LP |
359 | } |
360 | ||
c506027a DH |
361 | if (!s->seat || !seat_has_vts(s->seat)) |
362 | s->vtnr = 0; | |
a185c5aa | 363 | |
49e6fdbf DH |
364 | if (pos && s->seat) { |
365 | unsigned int npos; | |
366 | ||
367 | safe_atou(pos, &npos); | |
368 | seat_claim_position(s->seat, s, npos); | |
369 | } | |
370 | ||
a185c5aa | 371 | if (leader) { |
f8e2fb7b LP |
372 | k = parse_pid(leader, &s->leader); |
373 | if (k >= 0) | |
374 | audit_session_from_pid(s->leader, &s->audit_id); | |
a185c5aa LP |
375 | } |
376 | ||
a91e4e53 LP |
377 | if (type) { |
378 | SessionType t; | |
379 | ||
380 | t = session_type_from_string(type); | |
381 | if (t >= 0) | |
382 | s->type = t; | |
383 | } | |
384 | ||
55efac6c LP |
385 | if (class) { |
386 | SessionClass c; | |
387 | ||
388 | c = session_class_from_string(class); | |
389 | if (c >= 0) | |
390 | s->class = c; | |
391 | } | |
392 | ||
b4f78aea LP |
393 | if (s->fifo_path) { |
394 | int fd; | |
395 | ||
396 | /* If we open an unopened pipe for reading we will not | |
397 | get an EOF. to trigger an EOF we hence open it for | |
398 | reading, but close it right-away which then will | |
399 | trigger the EOF. */ | |
400 | ||
401 | fd = session_create_fifo(s); | |
402 | if (fd >= 0) | |
403 | close_nointr_nofail(fd); | |
404 | } | |
405 | ||
9444b1f2 LP |
406 | if (realtime) { |
407 | unsigned long long l; | |
408 | if (sscanf(realtime, "%llu", &l) > 0) | |
409 | s->timestamp.realtime = l; | |
410 | } | |
411 | ||
412 | if (monotonic) { | |
413 | unsigned long long l; | |
414 | if (sscanf(monotonic, "%llu", &l) > 0) | |
415 | s->timestamp.monotonic = l; | |
416 | } | |
a185c5aa | 417 | |
6d33772f DH |
418 | if (controller) { |
419 | if (bus_name_has_owner(s->manager->bus, controller, NULL) > 0) | |
420 | session_set_controller(s, controller, false); | |
90a18413 DH |
421 | else |
422 | session_restore_vt(s); | |
6d33772f DH |
423 | } |
424 | ||
a185c5aa | 425 | return r; |
20263082 LP |
426 | } |
427 | ||
428 | int session_activate(Session *s) { | |
d7bd01b5 DH |
429 | unsigned int num_pending; |
430 | ||
20263082 | 431 | assert(s); |
9444b1f2 | 432 | assert(s->user); |
20263082 | 433 | |
20263082 LP |
434 | if (!s->seat) |
435 | return -ENOTSUP; | |
436 | ||
437 | if (s->seat->active == s) | |
438 | return 0; | |
439 | ||
d7bd01b5 DH |
440 | /* on seats with VTs, we let VTs manage session-switching */ |
441 | if (seat_has_vts(s->seat)) { | |
92bd5ff3 | 442 | if (!s->vtnr) |
d7bd01b5 DH |
443 | return -ENOTSUP; |
444 | ||
445 | return chvt(s->vtnr); | |
446 | } | |
447 | ||
448 | /* On seats without VTs, we implement session-switching in logind. We | |
449 | * try to pause all session-devices and wait until the session | |
450 | * controller acknowledged them. Once all devices are asleep, we simply | |
451 | * switch the active session and be done. | |
452 | * We save the session we want to switch to in seat->pending_switch and | |
453 | * seat_complete_switch() will perform the final switch. */ | |
454 | ||
455 | s->seat->pending_switch = s; | |
456 | ||
457 | /* if no devices are running, immediately perform the session switch */ | |
458 | num_pending = session_device_try_pause_all(s); | |
459 | if (!num_pending) | |
460 | seat_complete_switch(s->seat); | |
20263082 | 461 | |
d7bd01b5 | 462 | return 0; |
20263082 LP |
463 | } |
464 | ||
fb6becb4 | 465 | static int session_start_scope(Session *s) { |
98a28fef LP |
466 | int r; |
467 | ||
468 | assert(s); | |
9444b1f2 | 469 | assert(s->user); |
fb6becb4 | 470 | assert(s->user->slice); |
98a28fef | 471 | |
fb6becb4 | 472 | if (!s->scope) { |
cc377381 | 473 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; |
d0af76e6 | 474 | _cleanup_free_ char *description = NULL; |
405e0255 | 475 | const char *kill_mode; |
d0af76e6 LP |
476 | char *scope, *job; |
477 | ||
405e0255 LP |
478 | description = strjoin("Session ", s->id, " of user ", s->user->name, NULL); |
479 | if (!description) | |
480 | return log_oom(); | |
481 | ||
d0af76e6 LP |
482 | scope = strjoin("session-", s->id, ".scope", NULL); |
483 | if (!scope) | |
ae018d9b LP |
484 | return log_oom(); |
485 | ||
405e0255 | 486 | kill_mode = manager_shall_kill(s->manager, s->user->name) ? "control-group" : "none"; |
98a28fef | 487 | |
405e0255 | 488 | r = manager_start_scope(s->manager, scope, s->leader, s->user->slice, description, "systemd-user-sessions.service", kill_mode, &error, &job); |
d0af76e6 | 489 | if (r < 0) { |
042f5988 | 490 | log_error("Failed to start session scope %s: %s %s", |
cc377381 | 491 | scope, bus_error_message(&error, r), error.name); |
d0af76e6 | 492 | free(scope); |
f2d4f98d | 493 | return r; |
d0af76e6 LP |
494 | } else { |
495 | s->scope = scope; | |
496 | ||
497 | free(s->scope_job); | |
498 | s->scope_job = job; | |
499 | } | |
20263082 LP |
500 | } |
501 | ||
d0af76e6 LP |
502 | if (s->scope) |
503 | hashmap_put(s->manager->session_units, s->scope, s); | |
504 | ||
20263082 LP |
505 | return 0; |
506 | } | |
507 | ||
508 | int session_start(Session *s) { | |
509 | int r; | |
510 | ||
511 | assert(s); | |
9444b1f2 LP |
512 | |
513 | if (!s->user) | |
514 | return -ESTALE; | |
20263082 | 515 | |
9418f147 LP |
516 | if (s->started) |
517 | return 0; | |
518 | ||
ed18b08b LP |
519 | r = user_start(s->user); |
520 | if (r < 0) | |
521 | return r; | |
522 | ||
fb6becb4 LP |
523 | /* Create cgroup */ |
524 | r = session_start_scope(s); | |
525 | if (r < 0) | |
526 | return r; | |
527 | ||
d9eb81f9 | 528 | log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO, |
1ca6783f | 529 | MESSAGE_ID(SD_MESSAGE_SESSION_START), |
877d54e9 LP |
530 | "SESSION_ID=%s", s->id, |
531 | "USER_ID=%s", s->user->name, | |
532 | "LEADER=%lu", (unsigned long) s->leader, | |
533 | "MESSAGE=New session %s of user %s.", s->id, s->user->name, | |
534 | NULL); | |
98a28fef | 535 | |
9444b1f2 LP |
536 | if (!dual_timestamp_is_set(&s->timestamp)) |
537 | dual_timestamp_get(&s->timestamp); | |
14c3baca | 538 | |
e9816c48 LP |
539 | if (s->seat) |
540 | seat_read_active_vt(s->seat); | |
541 | ||
9418f147 LP |
542 | s->started = true; |
543 | ||
e9816c48 LP |
544 | /* Save session data */ |
545 | session_save(s); | |
7f7bb946 | 546 | user_save(s->user); |
e9816c48 | 547 | |
da119395 LP |
548 | session_send_signal(s, true); |
549 | ||
9418f147 | 550 | if (s->seat) { |
7f7bb946 LP |
551 | seat_save(s->seat); |
552 | ||
9418f147 | 553 | if (s->seat->active == s) |
cc377381 | 554 | seat_send_changed(s->seat, "Sessions", "ActiveSession", NULL); |
9418f147 | 555 | else |
cc377381 | 556 | seat_send_changed(s->seat, "Sessions", NULL); |
9418f147 LP |
557 | } |
558 | ||
cc377381 | 559 | user_send_changed(s->user, "Sessions", NULL); |
9418f147 | 560 | |
20263082 LP |
561 | return 0; |
562 | } | |
563 | ||
fb6becb4 | 564 | static int session_stop_scope(Session *s) { |
cc377381 | 565 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; |
fb6becb4 | 566 | char *job; |
20263082 | 567 | int r; |
20263082 LP |
568 | |
569 | assert(s); | |
570 | ||
fb6becb4 LP |
571 | if (!s->scope) |
572 | return 0; | |
9b221b63 | 573 | |
fb6becb4 LP |
574 | r = manager_stop_unit(s->manager, s->scope, &error, &job); |
575 | if (r < 0) { | |
cc377381 | 576 | log_error("Failed to stop session scope: %s", bus_error_message(&error, r)); |
fb6becb4 | 577 | return r; |
20263082 LP |
578 | } |
579 | ||
fb6becb4 LP |
580 | free(s->scope_job); |
581 | s->scope_job = job; | |
20263082 | 582 | |
9b221b63 | 583 | return 0; |
20263082 LP |
584 | } |
585 | ||
20263082 | 586 | int session_stop(Session *s) { |
405e0255 LP |
587 | int r; |
588 | ||
589 | assert(s); | |
590 | ||
591 | if (!s->user) | |
592 | return -ESTALE; | |
593 | ||
594 | /* Kill cgroup */ | |
595 | r = session_stop_scope(s); | |
596 | ||
597 | session_save(s); | |
cc377381 | 598 | user_save(s->user); |
405e0255 LP |
599 | |
600 | return r; | |
601 | } | |
602 | ||
603 | int session_finalize(Session *s) { | |
604 | int r = 0; | |
118ecf32 | 605 | SessionDevice *sd; |
20263082 LP |
606 | |
607 | assert(s); | |
608 | ||
9444b1f2 LP |
609 | if (!s->user) |
610 | return -ESTALE; | |
611 | ||
ed18b08b | 612 | if (s->started) |
d9eb81f9 | 613 | log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO, |
1ca6783f | 614 | MESSAGE_ID(SD_MESSAGE_SESSION_STOP), |
877d54e9 LP |
615 | "SESSION_ID=%s", s->id, |
616 | "USER_ID=%s", s->user->name, | |
617 | "LEADER=%lu", (unsigned long) s->leader, | |
618 | "MESSAGE=Removed session %s.", s->id, | |
619 | NULL); | |
98a28fef | 620 | |
118ecf32 DH |
621 | /* Kill session devices */ |
622 | while ((sd = hashmap_first(s->devices))) | |
623 | session_device_free(sd); | |
624 | ||
d2f92cdf LP |
625 | unlink(s->state_file); |
626 | session_add_to_gc_queue(s); | |
ed18b08b | 627 | user_add_to_gc_queue(s->user); |
14c3baca | 628 | |
405e0255 | 629 | if (s->started) { |
ed18b08b | 630 | session_send_signal(s, false); |
405e0255 LP |
631 | s->started = false; |
632 | } | |
50fb9793 | 633 | |
9418f147 LP |
634 | if (s->seat) { |
635 | if (s->seat->active == s) | |
636 | seat_set_active(s->seat, NULL); | |
637 | ||
cc377381 | 638 | seat_send_changed(s->seat, "Sessions", NULL); |
23bd3b62 | 639 | seat_save(s->seat); |
9418f147 LP |
640 | } |
641 | ||
cc377381 | 642 | user_send_changed(s->user, "Sessions", NULL); |
23bd3b62 | 643 | user_save(s->user); |
9418f147 | 644 | |
20263082 LP |
645 | return r; |
646 | } | |
647 | ||
648 | bool session_is_active(Session *s) { | |
649 | assert(s); | |
650 | ||
651 | if (!s->seat) | |
652 | return true; | |
653 | ||
654 | return s->seat->active == s; | |
655 | } | |
656 | ||
23406ce5 LP |
657 | static int get_tty_atime(const char *tty, usec_t *atime) { |
658 | _cleanup_free_ char *p = NULL; | |
a185c5aa | 659 | struct stat st; |
23406ce5 LP |
660 | |
661 | assert(tty); | |
662 | assert(atime); | |
663 | ||
664 | if (!path_is_absolute(tty)) { | |
665 | p = strappend("/dev/", tty); | |
666 | if (!p) | |
667 | return -ENOMEM; | |
668 | ||
669 | tty = p; | |
670 | } else if (!path_startswith(tty, "/dev/")) | |
671 | return -ENOENT; | |
672 | ||
673 | if (lstat(tty, &st) < 0) | |
674 | return -errno; | |
675 | ||
676 | *atime = timespec_load(&st.st_atim); | |
677 | return 0; | |
678 | } | |
679 | ||
680 | static int get_process_ctty_atime(pid_t pid, usec_t *atime) { | |
681 | _cleanup_free_ char *p = NULL; | |
682 | int r; | |
683 | ||
684 | assert(pid > 0); | |
685 | assert(atime); | |
686 | ||
687 | r = get_ctty(pid, NULL, &p); | |
688 | if (r < 0) | |
689 | return r; | |
690 | ||
691 | return get_tty_atime(p, atime); | |
692 | } | |
693 | ||
694 | int session_get_idle_hint(Session *s, dual_timestamp *t) { | |
23406ce5 LP |
695 | usec_t atime = 0, n; |
696 | int r; | |
a185c5aa LP |
697 | |
698 | assert(s); | |
699 | ||
23406ce5 | 700 | /* Explicit idle hint is set */ |
a185c5aa LP |
701 | if (s->idle_hint) { |
702 | if (t) | |
703 | *t = s->idle_hint_timestamp; | |
704 | ||
705 | return s->idle_hint; | |
706 | } | |
707 | ||
0762eaa3 | 708 | /* Graphical sessions should really implement a real |
23406ce5 LP |
709 | * idle hint logic */ |
710 | if (s->display) | |
a185c5aa LP |
711 | goto dont_know; |
712 | ||
23406ce5 LP |
713 | /* For sessions with an explicitly configured tty, let's check |
714 | * its atime */ | |
715 | if (s->tty) { | |
716 | r = get_tty_atime(s->tty, &atime); | |
717 | if (r >= 0) | |
718 | goto found_atime; | |
719 | } | |
a185c5aa | 720 | |
23406ce5 LP |
721 | /* For sessions with a leader but no explicitly configured |
722 | * tty, let's check the controlling tty of the leader */ | |
723 | if (s->leader > 0) { | |
724 | r = get_process_ctty_atime(s->leader, &atime); | |
725 | if (r >= 0) | |
726 | goto found_atime; | |
a185c5aa LP |
727 | } |
728 | ||
a185c5aa LP |
729 | dont_know: |
730 | if (t) | |
731 | *t = s->idle_hint_timestamp; | |
732 | ||
733 | return 0; | |
23406ce5 LP |
734 | |
735 | found_atime: | |
736 | if (t) | |
737 | dual_timestamp_from_realtime(t, atime); | |
738 | ||
739 | n = now(CLOCK_REALTIME); | |
740 | ||
741 | if (s->manager->idle_action_usec <= 0) | |
742 | return 0; | |
743 | ||
744 | return atime + s->manager->idle_action_usec <= n; | |
a185c5aa LP |
745 | } |
746 | ||
bef422ae LP |
747 | void session_set_idle_hint(Session *s, bool b) { |
748 | assert(s); | |
749 | ||
750 | if (s->idle_hint == b) | |
751 | return; | |
752 | ||
753 | s->idle_hint = b; | |
754 | dual_timestamp_get(&s->idle_hint_timestamp); | |
9418f147 | 755 | |
cc377381 | 756 | session_send_changed(s, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); |
9418f147 LP |
757 | |
758 | if (s->seat) | |
cc377381 LP |
759 | seat_send_changed(s->seat, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); |
760 | ||
761 | user_send_changed(s->user, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); | |
762 | manager_send_changed(s->manager, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); | |
763 | } | |
764 | ||
765 | static int session_dispatch_fifo(sd_event_source *es, int fd, uint32_t revents, void *userdata) { | |
766 | Session *s = userdata; | |
767 | ||
768 | assert(s); | |
769 | assert(s->fifo_fd == fd); | |
770 | ||
771 | /* EOF on the FIFO means the session died abnormally. */ | |
772 | ||
773 | session_remove_fifo(s); | |
774 | session_stop(s); | |
775 | ||
776 | return 1; | |
bef422ae LP |
777 | } |
778 | ||
932e3ee7 LP |
779 | int session_create_fifo(Session *s) { |
780 | int r; | |
781 | ||
31b79c2b LP |
782 | assert(s); |
783 | ||
b4f78aea | 784 | /* Create FIFO */ |
932e3ee7 | 785 | if (!s->fifo_path) { |
d2e54fae | 786 | r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0); |
e6061ab2 LP |
787 | if (r < 0) |
788 | return r; | |
789 | ||
932e3ee7 LP |
790 | if (asprintf(&s->fifo_path, "/run/systemd/sessions/%s.ref", s->id) < 0) |
791 | return -ENOMEM; | |
31b79c2b | 792 | |
932e3ee7 LP |
793 | if (mkfifo(s->fifo_path, 0600) < 0 && errno != EEXIST) |
794 | return -errno; | |
795 | } | |
31b79c2b | 796 | |
932e3ee7 | 797 | /* Open reading side */ |
b4f78aea | 798 | if (s->fifo_fd < 0) { |
b4f78aea LP |
799 | s->fifo_fd = open(s->fifo_path, O_RDONLY|O_CLOEXEC|O_NDELAY); |
800 | if (s->fifo_fd < 0) | |
801 | return -errno; | |
802 | ||
cc377381 LP |
803 | } |
804 | ||
805 | if (!s->fifo_event_source) { | |
806 | r = sd_event_add_io(s->manager->event, s->fifo_fd, 0, session_dispatch_fifo, s, &s->fifo_event_source); | |
b4f78aea LP |
807 | if (r < 0) |
808 | return r; | |
809 | ||
718db961 | 810 | r = sd_event_source_set_priority(s->fifo_event_source, SD_EVENT_PRIORITY_IDLE); |
cc377381 LP |
811 | if (r < 0) |
812 | return r; | |
b4f78aea | 813 | } |
932e3ee7 LP |
814 | |
815 | /* Open writing side */ | |
816 | r = open(s->fifo_path, O_WRONLY|O_CLOEXEC|O_NDELAY); | |
817 | if (r < 0) | |
818 | return -errno; | |
31b79c2b | 819 | |
932e3ee7 LP |
820 | return r; |
821 | } | |
822 | ||
823 | void session_remove_fifo(Session *s) { | |
824 | assert(s); | |
825 | ||
cc377381 LP |
826 | if (s->fifo_event_source) |
827 | s->fifo_event_source = sd_event_source_unref(s->fifo_event_source); | |
828 | ||
932e3ee7 | 829 | if (s->fifo_fd >= 0) { |
932e3ee7 LP |
830 | close_nointr_nofail(s->fifo_fd); |
831 | s->fifo_fd = -1; | |
832 | } | |
833 | ||
834 | if (s->fifo_path) { | |
835 | unlink(s->fifo_path); | |
836 | free(s->fifo_path); | |
837 | s->fifo_path = NULL; | |
838 | } | |
31b79c2b LP |
839 | } |
840 | ||
cc377381 | 841 | bool session_check_gc(Session *s, bool drop_not_started) { |
20263082 LP |
842 | int r; |
843 | ||
844 | assert(s); | |
845 | ||
4a4b033f | 846 | if (drop_not_started && !s->started) |
cc377381 | 847 | return false; |
932e3ee7 | 848 | |
9444b1f2 | 849 | if (!s->user) |
cc377381 | 850 | return false; |
9444b1f2 | 851 | |
932e3ee7 | 852 | if (s->fifo_fd >= 0) { |
932e3ee7 | 853 | r = pipe_eof(s->fifo_fd); |
20263082 | 854 | if (r < 0) |
cc377381 | 855 | return true; |
20263082 | 856 | |
14c3baca | 857 | if (r == 0) |
cc377381 | 858 | return true; |
20263082 LP |
859 | } |
860 | ||
cc377381 LP |
861 | if (s->scope_job && manager_job_is_active(s->manager, s->scope_job)) |
862 | return true; | |
20263082 | 863 | |
cc377381 LP |
864 | if (s->scope && manager_unit_is_active(s->manager, s->scope)) |
865 | return true; | |
20263082 | 866 | |
cc377381 | 867 | return false; |
20263082 LP |
868 | } |
869 | ||
14c3baca LP |
870 | void session_add_to_gc_queue(Session *s) { |
871 | assert(s); | |
872 | ||
873 | if (s->in_gc_queue) | |
874 | return; | |
875 | ||
71fda00f | 876 | LIST_PREPEND(gc_queue, s->manager->session_gc_queue, s); |
14c3baca LP |
877 | s->in_gc_queue = true; |
878 | } | |
879 | ||
0604381b LP |
880 | SessionState session_get_state(Session *s) { |
881 | assert(s); | |
882 | ||
fb6becb4 | 883 | if (s->scope_job) |
405e0255 | 884 | return SESSION_OPENING; |
fb6becb4 | 885 | |
0604381b LP |
886 | if (s->fifo_fd < 0) |
887 | return SESSION_CLOSING; | |
888 | ||
889 | if (session_is_active(s)) | |
890 | return SESSION_ACTIVE; | |
891 | ||
892 | return SESSION_ONLINE; | |
893 | } | |
894 | ||
de07ab16 | 895 | int session_kill(Session *s, KillWho who, int signo) { |
de07ab16 LP |
896 | assert(s); |
897 | ||
fb6becb4 | 898 | if (!s->scope) |
de07ab16 LP |
899 | return -ESRCH; |
900 | ||
fb6becb4 | 901 | return manager_kill_unit(s->manager, s->scope, who, signo, NULL); |
de07ab16 LP |
902 | } |
903 | ||
90a18413 DH |
904 | static int session_open_vt(Session *s) { |
905 | char path[128]; | |
906 | ||
92bd5ff3 | 907 | if (!s->vtnr) |
90a18413 DH |
908 | return -1; |
909 | ||
910 | if (s->vtfd >= 0) | |
911 | return s->vtfd; | |
912 | ||
92bd5ff3 | 913 | sprintf(path, "/dev/tty%u", s->vtnr); |
90a18413 DH |
914 | s->vtfd = open(path, O_RDWR | O_CLOEXEC | O_NONBLOCK | O_NOCTTY); |
915 | if (s->vtfd < 0) { | |
916 | log_error("cannot open VT %s of session %s: %m", path, s->id); | |
917 | return -1; | |
918 | } | |
919 | ||
920 | return s->vtfd; | |
921 | } | |
922 | ||
923 | static int session_vt_fn(sd_event_source *source, const struct signalfd_siginfo *si, void *data) { | |
924 | Session *s = data; | |
925 | ||
926 | if (s->vtfd >= 0) | |
927 | ioctl(s->vtfd, VT_RELDISP, 1); | |
928 | ||
929 | return 0; | |
930 | } | |
931 | ||
932 | void session_mute_vt(Session *s) { | |
933 | int vt, r; | |
934 | struct vt_mode mode = { 0 }; | |
935 | sigset_t mask; | |
936 | ||
937 | vt = session_open_vt(s); | |
938 | if (vt < 0) | |
939 | return; | |
940 | ||
941 | r = ioctl(vt, KDSKBMODE, K_OFF); | |
942 | if (r < 0) | |
943 | goto error; | |
944 | ||
945 | r = ioctl(vt, KDSETMODE, KD_GRAPHICS); | |
946 | if (r < 0) | |
947 | goto error; | |
948 | ||
949 | sigemptyset(&mask); | |
950 | sigaddset(&mask, SIGUSR1); | |
951 | sigprocmask(SIG_BLOCK, &mask, NULL); | |
952 | ||
953 | r = sd_event_add_signal(s->manager->event, SIGUSR1, session_vt_fn, s, &s->vt_source); | |
954 | if (r < 0) | |
955 | goto error; | |
956 | ||
957 | /* Oh, thanks to the VT layer, VT_AUTO does not work with KD_GRAPHICS. | |
958 | * So we need a dummy handler here which just acknowledges *all* VT | |
959 | * switch requests. */ | |
960 | mode.mode = VT_PROCESS; | |
961 | mode.relsig = SIGUSR1; | |
962 | mode.acqsig = SIGUSR1; | |
963 | r = ioctl(vt, VT_SETMODE, &mode); | |
964 | if (r < 0) | |
965 | goto error; | |
966 | ||
967 | return; | |
968 | ||
969 | error: | |
92bd5ff3 | 970 | log_error("cannot mute VT %u for session %s (%d/%d)", s->vtnr, s->id, r, errno); |
90a18413 DH |
971 | session_restore_vt(s); |
972 | } | |
973 | ||
974 | void session_restore_vt(Session *s) { | |
975 | _cleanup_free_ char *utf8; | |
976 | int vt, kb = K_XLATE; | |
977 | struct vt_mode mode = { 0 }; | |
978 | ||
979 | vt = session_open_vt(s); | |
980 | if (vt < 0) | |
981 | return; | |
982 | ||
983 | sd_event_source_unref(s->vt_source); | |
984 | s->vt_source = NULL; | |
985 | ||
986 | ioctl(vt, KDSETMODE, KD_TEXT); | |
987 | ||
988 | if (read_one_line_file("/sys/module/vt/parameters/default_utf8", &utf8) >= 0 && *utf8 == '1') | |
989 | kb = K_UNICODE; | |
990 | ioctl(vt, KDSKBMODE, kb); | |
991 | ||
992 | mode.mode = VT_AUTO; | |
993 | ioctl(vt, VT_SETMODE, &mode); | |
994 | ||
995 | close_nointr_nofail(vt); | |
996 | s->vtfd = -1; | |
997 | } | |
998 | ||
cc377381 | 999 | bool session_is_controller(Session *s, const char *sender) { |
ae5e06bd DH |
1000 | assert(s); |
1001 | ||
1002 | return streq_ptr(s->controller, sender); | |
1003 | } | |
1004 | ||
6d33772f DH |
1005 | static void session_swap_controller(Session *s, char *name) { |
1006 | SessionDevice *sd; | |
1007 | ||
1008 | if (s->controller) { | |
1009 | manager_drop_busname(s->manager, s->controller); | |
1010 | free(s->controller); | |
1011 | s->controller = NULL; | |
1012 | ||
1013 | /* Drop all devices as they're now unused. Do that after the | |
1014 | * controller is released to avoid sending out useles | |
1015 | * dbus signals. */ | |
1016 | while ((sd = hashmap_first(s->devices))) | |
1017 | session_device_free(sd); | |
90a18413 DH |
1018 | |
1019 | if (!name) | |
1020 | session_restore_vt(s); | |
6d33772f DH |
1021 | } |
1022 | ||
1023 | s->controller = name; | |
1024 | session_save(s); | |
1025 | } | |
1026 | ||
ae5e06bd DH |
1027 | int session_set_controller(Session *s, const char *sender, bool force) { |
1028 | char *t; | |
1029 | int r; | |
1030 | ||
1031 | assert(s); | |
1032 | assert(sender); | |
1033 | ||
1034 | if (session_is_controller(s, sender)) | |
1035 | return 0; | |
1036 | if (s->controller && !force) | |
1037 | return -EBUSY; | |
1038 | ||
1039 | t = strdup(sender); | |
1040 | if (!t) | |
1041 | return -ENOMEM; | |
1042 | ||
1043 | r = manager_watch_busname(s->manager, sender); | |
1044 | if (r) { | |
1045 | free(t); | |
1046 | return r; | |
1047 | } | |
1048 | ||
6d33772f | 1049 | session_swap_controller(s, t); |
ae5e06bd | 1050 | |
90a18413 DH |
1051 | /* When setting a session controller, we forcibly mute the VT and set |
1052 | * it into graphics-mode. Applications can override that by changing | |
1053 | * VT state after calling TakeControl(). However, this serves as a good | |
1054 | * default and well-behaving controllers can now ignore VTs entirely. | |
1055 | * Note that we reset the VT on ReleaseControl() and if the controller | |
1056 | * exits. | |
1057 | * If logind crashes/restarts, we restore the controller during restart | |
1058 | * or reset the VT in case it crashed/exited, too. */ | |
1059 | session_mute_vt(s); | |
1060 | ||
ae5e06bd DH |
1061 | return 0; |
1062 | } | |
1063 | ||
1064 | void session_drop_controller(Session *s) { | |
1065 | assert(s); | |
1066 | ||
1067 | if (!s->controller) | |
1068 | return; | |
1069 | ||
6d33772f | 1070 | session_swap_controller(s, NULL); |
ae5e06bd DH |
1071 | } |
1072 | ||
fb6becb4 LP |
1073 | static const char* const session_state_table[_SESSION_STATE_MAX] = { |
1074 | [SESSION_OPENING] = "opening", | |
0604381b LP |
1075 | [SESSION_ONLINE] = "online", |
1076 | [SESSION_ACTIVE] = "active", | |
1077 | [SESSION_CLOSING] = "closing" | |
1078 | }; | |
1079 | ||
1080 | DEFINE_STRING_TABLE_LOOKUP(session_state, SessionState); | |
1081 | ||
20263082 | 1082 | static const char* const session_type_table[_SESSION_TYPE_MAX] = { |
3f49d45a | 1083 | [SESSION_TTY] = "tty", |
98a28fef | 1084 | [SESSION_X11] = "x11", |
d9eb81f9 LP |
1085 | [SESSION_WAYLAND] = "wayland", |
1086 | [SESSION_UNSPECIFIED] = "unspecified", | |
20263082 LP |
1087 | }; |
1088 | ||
1089 | DEFINE_STRING_TABLE_LOOKUP(session_type, SessionType); | |
de07ab16 | 1090 | |
55efac6c LP |
1091 | static const char* const session_class_table[_SESSION_CLASS_MAX] = { |
1092 | [SESSION_USER] = "user", | |
1093 | [SESSION_GREETER] = "greeter", | |
e2acb67b LP |
1094 | [SESSION_LOCK_SCREEN] = "lock-screen", |
1095 | [SESSION_BACKGROUND] = "background" | |
55efac6c LP |
1096 | }; |
1097 | ||
1098 | DEFINE_STRING_TABLE_LOOKUP(session_class, SessionClass); | |
1099 | ||
de07ab16 LP |
1100 | static const char* const kill_who_table[_KILL_WHO_MAX] = { |
1101 | [KILL_LEADER] = "leader", | |
1102 | [KILL_ALL] = "all" | |
1103 | }; | |
1104 | ||
1105 | DEFINE_STRING_TABLE_LOOKUP(kill_who, KillWho); |