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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
20263082 LP |
2 | |
3 | #include <errno.h> | |
90a18413 | 4 | #include <fcntl.h> |
90a18413 | 5 | #include <linux/kd.h> |
4f5dd394 | 6 | #include <linux/vt.h> |
90a18413 | 7 | #include <signal.h> |
44176400 | 8 | #include <stdio_ext.h> |
20263082 | 9 | #include <string.h> |
90a18413 | 10 | #include <sys/ioctl.h> |
20263082 LP |
11 | #include <unistd.h> |
12 | ||
cc377381 | 13 | #include "sd-messages.h" |
4f5dd394 | 14 | |
b5efdb8a | 15 | #include "alloc-util.h" |
430f0182 | 16 | #include "audit-util.h" |
cc377381 | 17 | #include "bus-error.h" |
4f5dd394 LP |
18 | #include "bus-util.h" |
19 | #include "escape.h" | |
3ffd4af2 | 20 | #include "fd-util.h" |
4f5dd394 | 21 | #include "fileio.h" |
f97b34a6 | 22 | #include "format-util.h" |
c004493c | 23 | #include "io-util.h" |
3ffd4af2 | 24 | #include "logind-session.h" |
4f5dd394 | 25 | #include "mkdir.h" |
6bedfcbb | 26 | #include "parse-util.h" |
4f5dd394 | 27 | #include "path-util.h" |
8c29a457 | 28 | #include "process-util.h" |
8b43440b | 29 | #include "string-table.h" |
25a1ab4e | 30 | #include "strv.h" |
288a74cc | 31 | #include "terminal-util.h" |
b1d4f8e1 | 32 | #include "user-util.h" |
4f5dd394 | 33 | #include "util.h" |
20263082 | 34 | |
5f41d1f1 LP |
35 | #define RELEASE_USEC (20*USEC_PER_SEC) |
36 | ||
37 | static void session_remove_fifo(Session *s); | |
38 | ||
8c29a457 LP |
39 | int session_new(Session **ret, Manager *m, const char *id) { |
40 | _cleanup_(session_freep) Session *s = NULL; | |
41 | int r; | |
20263082 | 42 | |
8c29a457 | 43 | assert(ret); |
20263082 LP |
44 | assert(m); |
45 | assert(id); | |
46 | ||
8c29a457 LP |
47 | if (!session_id_valid(id)) |
48 | return -EINVAL; | |
49 | ||
50 | s = new(Session, 1); | |
20263082 | 51 | if (!s) |
8c29a457 LP |
52 | return -ENOMEM; |
53 | ||
54 | *s = (Session) { | |
55 | .manager = m, | |
56 | .fifo_fd = -1, | |
57 | .vtfd = -1, | |
58 | .audit_id = AUDIT_SESSION_INVALID, | |
59 | }; | |
20263082 | 60 | |
98a28fef | 61 | s->state_file = strappend("/run/systemd/sessions/", id); |
6b430fdb | 62 | if (!s->state_file) |
8c29a457 | 63 | return -ENOMEM; |
118ecf32 | 64 | |
2b6bf07d | 65 | s->id = basename(s->state_file); |
20263082 | 66 | |
8c29a457 LP |
67 | s->devices = hashmap_new(&devt_hash_ops); |
68 | if (!s->devices) | |
69 | return -ENOMEM; | |
20263082 | 70 | |
8c29a457 LP |
71 | r = hashmap_put(m->sessions, s->id, s); |
72 | if (r < 0) | |
73 | return r; | |
20263082 | 74 | |
8c29a457 LP |
75 | *ret = TAKE_PTR(s); |
76 | return 0; | |
20263082 LP |
77 | } |
78 | ||
8c29a457 | 79 | Session* session_free(Session *s) { |
118ecf32 DH |
80 | SessionDevice *sd; |
81 | ||
8c29a457 LP |
82 | if (!s) |
83 | return NULL; | |
20263082 | 84 | |
14c3baca | 85 | if (s->in_gc_queue) |
71fda00f | 86 | LIST_REMOVE(gc_queue, s->manager->session_gc_queue, s); |
14c3baca | 87 | |
5f41d1f1 LP |
88 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
89 | ||
cc377381 LP |
90 | session_remove_fifo(s); |
91 | ||
ae5e06bd DH |
92 | session_drop_controller(s); |
93 | ||
118ecf32 DH |
94 | while ((sd = hashmap_first(s->devices))) |
95 | session_device_free(sd); | |
96 | ||
97 | hashmap_free(s->devices); | |
98 | ||
20263082 | 99 | if (s->user) { |
71fda00f | 100 | LIST_REMOVE(sessions_by_user, s->user->sessions, s); |
20263082 LP |
101 | |
102 | if (s->user->display == s) | |
103 | s->user->display = NULL; | |
9afe9efb LP |
104 | |
105 | user_update_last_session_timer(s->user); | |
20263082 LP |
106 | } |
107 | ||
9418f147 LP |
108 | if (s->seat) { |
109 | if (s->seat->active == s) | |
110 | s->seat->active = NULL; | |
d7bd01b5 DH |
111 | if (s->seat->pending_switch == s) |
112 | s->seat->pending_switch = NULL; | |
9418f147 | 113 | |
49e6fdbf | 114 | seat_evict_position(s->seat, s); |
71fda00f | 115 | LIST_REMOVE(sessions_by_seat, s->seat->sessions, s); |
9418f147 | 116 | } |
20263082 | 117 | |
fb6becb4 LP |
118 | if (s->scope) { |
119 | hashmap_remove(s->manager->session_units, s->scope); | |
120 | free(s->scope); | |
121 | } | |
122 | ||
238794b1 LP |
123 | if (pid_is_valid(s->leader)) |
124 | (void) hashmap_remove_value(s->manager->sessions_by_leader, PID_TO_PTR(s->leader), s); | |
125 | ||
fb6becb4 | 126 | free(s->scope_job); |
1713813d | 127 | |
cc377381 | 128 | sd_bus_message_unref(s->create_message); |
20263082 LP |
129 | |
130 | free(s->tty); | |
131 | free(s->display); | |
132 | free(s->remote_host); | |
3f49d45a | 133 | free(s->remote_user); |
98a28fef | 134 | free(s->service); |
a4cd87e9 | 135 | free(s->desktop); |
20263082 LP |
136 | |
137 | hashmap_remove(s->manager->sessions, s->id); | |
98a28fef | 138 | |
d2f92cdf | 139 | free(s->state_file); |
8c29a457 LP |
140 | |
141 | return mfree(s); | |
20263082 LP |
142 | } |
143 | ||
9444b1f2 LP |
144 | void session_set_user(Session *s, User *u) { |
145 | assert(s); | |
146 | assert(!s->user); | |
147 | ||
148 | s->user = u; | |
71fda00f | 149 | LIST_PREPEND(sessions_by_user, u->sessions, s); |
9afe9efb LP |
150 | |
151 | user_update_last_session_timer(u); | |
9444b1f2 LP |
152 | } |
153 | ||
238794b1 LP |
154 | int session_set_leader(Session *s, pid_t pid) { |
155 | int r; | |
156 | ||
157 | assert(s); | |
158 | ||
159 | if (!pid_is_valid(pid)) | |
160 | return -EINVAL; | |
161 | ||
162 | if (s->leader == pid) | |
163 | return 0; | |
164 | ||
165 | r = hashmap_put(s->manager->sessions_by_leader, PID_TO_PTR(pid), s); | |
166 | if (r < 0) | |
167 | return r; | |
168 | ||
169 | if (pid_is_valid(s->leader)) | |
170 | (void) hashmap_remove_value(s->manager->sessions_by_leader, PID_TO_PTR(s->leader), s); | |
171 | ||
172 | s->leader = pid; | |
173 | (void) audit_session_from_pid(pid, &s->audit_id); | |
174 | ||
175 | return 1; | |
176 | } | |
177 | ||
aed24c4c FB |
178 | static void session_save_devices(Session *s, FILE *f) { |
179 | SessionDevice *sd; | |
180 | Iterator i; | |
181 | ||
182 | if (!hashmap_isempty(s->devices)) { | |
183 | fprintf(f, "DEVICES="); | |
184 | HASHMAP_FOREACH(sd, s->devices, i) | |
185 | fprintf(f, "%u:%u ", major(sd->dev), minor(sd->dev)); | |
186 | fprintf(f, "\n"); | |
187 | } | |
188 | } | |
189 | ||
20263082 | 190 | int session_save(Session *s) { |
507f22bd | 191 | _cleanup_free_ char *temp_path = NULL; |
cc377381 | 192 | _cleanup_fclose_ FILE *f = NULL; |
20263082 LP |
193 | int r = 0; |
194 | ||
195 | assert(s); | |
196 | ||
9444b1f2 LP |
197 | if (!s->user) |
198 | return -ESTALE; | |
199 | ||
accaeded LP |
200 | if (!s->started) |
201 | return 0; | |
202 | ||
37c1d5e9 | 203 | r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0, MKDIR_WARN_MODE); |
20263082 | 204 | if (r < 0) |
dacd6cee | 205 | goto fail; |
20263082 | 206 | |
14c3baca LP |
207 | r = fopen_temporary(s->state_file, &f, &temp_path); |
208 | if (r < 0) | |
dacd6cee | 209 | goto fail; |
20263082 | 210 | |
44176400 LP |
211 | (void) __fsetlocking(f, FSETLOCKING_BYCALLER); |
212 | (void) fchmod(fileno(f), 0644); | |
14c3baca | 213 | |
20263082 LP |
214 | fprintf(f, |
215 | "# This is private data. Do not parse.\n" | |
90b2de37 | 216 | "UID="UID_FMT"\n" |
20263082 LP |
217 | "USER=%s\n" |
218 | "ACTIVE=%i\n" | |
1c8280fd | 219 | "IS_DISPLAY=%i\n" |
0604381b | 220 | "STATE=%s\n" |
fb6becb4 | 221 | "REMOTE=%i\n", |
90b2de37 | 222 | s->user->uid, |
20263082 LP |
223 | s->user->name, |
224 | session_is_active(s), | |
1c8280fd | 225 | s->user->display == s, |
0604381b | 226 | session_state_to_string(session_get_state(s)), |
fb6becb4 | 227 | s->remote); |
20263082 | 228 | |
a91e4e53 | 229 | if (s->type >= 0) |
507f22bd | 230 | fprintf(f, "TYPE=%s\n", session_type_to_string(s->type)); |
a91e4e53 | 231 | |
55efac6c | 232 | if (s->class >= 0) |
507f22bd | 233 | fprintf(f, "CLASS=%s\n", session_class_to_string(s->class)); |
55efac6c | 234 | |
fb6becb4 LP |
235 | if (s->scope) |
236 | fprintf(f, "SCOPE=%s\n", s->scope); | |
fb6becb4 LP |
237 | if (s->scope_job) |
238 | fprintf(f, "SCOPE_JOB=%s\n", s->scope_job); | |
20263082 | 239 | |
932e3ee7 | 240 | if (s->fifo_path) |
507f22bd | 241 | fprintf(f, "FIFO=%s\n", s->fifo_path); |
932e3ee7 | 242 | |
20263082 | 243 | if (s->seat) |
507f22bd | 244 | fprintf(f, "SEAT=%s\n", s->seat->id); |
20263082 LP |
245 | |
246 | if (s->tty) | |
507f22bd | 247 | fprintf(f, "TTY=%s\n", s->tty); |
20263082 LP |
248 | |
249 | if (s->display) | |
507f22bd | 250 | fprintf(f, "DISPLAY=%s\n", s->display); |
20263082 | 251 | |
558c6490 LP |
252 | if (s->remote_host) { |
253 | _cleanup_free_ char *escaped; | |
254 | ||
255 | escaped = cescape(s->remote_host); | |
256 | if (!escaped) { | |
257 | r = -ENOMEM; | |
dacd6cee | 258 | goto fail; |
558c6490 LP |
259 | } |
260 | ||
261 | fprintf(f, "REMOTE_HOST=%s\n", escaped); | |
262 | } | |
263 | ||
264 | if (s->remote_user) { | |
265 | _cleanup_free_ char *escaped; | |
266 | ||
267 | escaped = cescape(s->remote_user); | |
268 | if (!escaped) { | |
269 | r = -ENOMEM; | |
dacd6cee | 270 | goto fail; |
558c6490 LP |
271 | } |
272 | ||
273 | fprintf(f, "REMOTE_USER=%s\n", escaped); | |
274 | } | |
275 | ||
276 | if (s->service) { | |
277 | _cleanup_free_ char *escaped; | |
20263082 | 278 | |
558c6490 LP |
279 | escaped = cescape(s->service); |
280 | if (!escaped) { | |
281 | r = -ENOMEM; | |
dacd6cee | 282 | goto fail; |
558c6490 LP |
283 | } |
284 | ||
285 | fprintf(f, "SERVICE=%s\n", escaped); | |
286 | } | |
3f49d45a | 287 | |
558c6490 LP |
288 | if (s->desktop) { |
289 | _cleanup_free_ char *escaped; | |
98a28fef | 290 | |
558c6490 LP |
291 | escaped = cescape(s->desktop); |
292 | if (!escaped) { | |
293 | r = -ENOMEM; | |
dacd6cee | 294 | goto fail; |
558c6490 LP |
295 | } |
296 | ||
297 | fprintf(f, "DESKTOP=%s\n", escaped); | |
298 | } | |
a4cd87e9 | 299 | |
bf7825ae | 300 | if (s->seat && seat_has_vts(s->seat)) |
92bd5ff3 | 301 | fprintf(f, "VTNR=%u\n", s->vtnr); |
20263082 | 302 | |
49e6fdbf | 303 | if (!s->vtnr) |
e6494a07 | 304 | fprintf(f, "POSITION=%u\n", s->position); |
49e6fdbf | 305 | |
54191eb3 | 306 | if (pid_is_valid(s->leader)) |
90b2de37 | 307 | fprintf(f, "LEADER="PID_FMT"\n", s->leader); |
20263082 | 308 | |
3a87a86e | 309 | if (audit_session_is_valid(s->audit_id)) |
507f22bd | 310 | fprintf(f, "AUDIT=%"PRIu32"\n", s->audit_id); |
20263082 | 311 | |
9444b1f2 LP |
312 | if (dual_timestamp_is_set(&s->timestamp)) |
313 | fprintf(f, | |
90b2de37 ZJS |
314 | "REALTIME="USEC_FMT"\n" |
315 | "MONOTONIC="USEC_FMT"\n", | |
316 | s->timestamp.realtime, | |
317 | s->timestamp.monotonic); | |
9444b1f2 | 318 | |
aed24c4c | 319 | if (s->controller) { |
6d33772f | 320 | fprintf(f, "CONTROLLER=%s\n", s->controller); |
aed24c4c FB |
321 | session_save_devices(s, f); |
322 | } | |
6d33772f | 323 | |
dacd6cee LP |
324 | r = fflush_and_check(f); |
325 | if (r < 0) | |
326 | goto fail; | |
14c3baca | 327 | |
dacd6cee | 328 | if (rename(temp_path, s->state_file) < 0) { |
20263082 | 329 | r = -errno; |
dacd6cee | 330 | goto fail; |
20263082 LP |
331 | } |
332 | ||
dacd6cee LP |
333 | return 0; |
334 | ||
335 | fail: | |
336 | (void) unlink(s->state_file); | |
14c3baca | 337 | |
dacd6cee LP |
338 | if (temp_path) |
339 | (void) unlink(temp_path); | |
340 | ||
341 | return log_error_errno(r, "Failed to save session data %s: %m", s->state_file); | |
20263082 LP |
342 | } |
343 | ||
aed24c4c FB |
344 | static int session_load_devices(Session *s, const char *devices) { |
345 | const char *p; | |
346 | int r = 0; | |
347 | ||
348 | assert(s); | |
349 | ||
350 | for (p = devices;;) { | |
351 | _cleanup_free_ char *word = NULL; | |
352 | SessionDevice *sd; | |
353 | dev_t dev; | |
354 | int k; | |
355 | ||
356 | k = extract_first_word(&p, &word, NULL, 0); | |
357 | if (k == 0) | |
358 | break; | |
359 | if (k < 0) { | |
360 | r = k; | |
361 | break; | |
362 | } | |
363 | ||
364 | k = parse_dev(word, &dev); | |
365 | if (k < 0) { | |
366 | r = k; | |
367 | continue; | |
368 | } | |
369 | ||
370 | /* The file descriptors for loaded devices will be reattached later. */ | |
371 | k = session_device_new(s, dev, false, &sd); | |
372 | if (k < 0) | |
373 | r = k; | |
374 | } | |
375 | ||
376 | if (r < 0) | |
377 | log_error_errno(r, "Loading session devices for session %s failed: %m", s->id); | |
378 | ||
379 | return r; | |
380 | } | |
dacd6cee | 381 | |
20263082 | 382 | int session_load(Session *s) { |
9444b1f2 | 383 | _cleanup_free_ char *remote = NULL, |
a185c5aa LP |
384 | *seat = NULL, |
385 | *vtnr = NULL, | |
be94d954 | 386 | *state = NULL, |
e6494a07 | 387 | *position = NULL, |
a185c5aa | 388 | *leader = NULL, |
55efac6c | 389 | *type = NULL, |
9444b1f2 LP |
390 | *class = NULL, |
391 | *uid = NULL, | |
392 | *realtime = NULL, | |
6d33772f | 393 | *monotonic = NULL, |
aed24c4c FB |
394 | *controller = NULL, |
395 | *active = NULL, | |
1c8280fd LP |
396 | *devices = NULL, |
397 | *is_display = NULL; | |
a185c5aa LP |
398 | |
399 | int k, r; | |
400 | ||
20263082 LP |
401 | assert(s); |
402 | ||
1a5a177e | 403 | r = parse_env_file(NULL, s->state_file, NEWLINE, |
a185c5aa | 404 | "REMOTE", &remote, |
fb6becb4 LP |
405 | "SCOPE", &s->scope, |
406 | "SCOPE_JOB", &s->scope_job, | |
932e3ee7 | 407 | "FIFO", &s->fifo_path, |
a185c5aa LP |
408 | "SEAT", &seat, |
409 | "TTY", &s->tty, | |
410 | "DISPLAY", &s->display, | |
411 | "REMOTE_HOST", &s->remote_host, | |
412 | "REMOTE_USER", &s->remote_user, | |
98a28fef | 413 | "SERVICE", &s->service, |
a4cd87e9 | 414 | "DESKTOP", &s->desktop, |
a185c5aa | 415 | "VTNR", &vtnr, |
be94d954 | 416 | "STATE", &state, |
e6494a07 | 417 | "POSITION", &position, |
a185c5aa | 418 | "LEADER", &leader, |
a91e4e53 | 419 | "TYPE", &type, |
55efac6c | 420 | "CLASS", &class, |
9444b1f2 LP |
421 | "UID", &uid, |
422 | "REALTIME", &realtime, | |
423 | "MONOTONIC", &monotonic, | |
6d33772f | 424 | "CONTROLLER", &controller, |
aed24c4c FB |
425 | "ACTIVE", &active, |
426 | "DEVICES", &devices, | |
1c8280fd | 427 | "IS_DISPLAY", &is_display, |
a185c5aa LP |
428 | NULL); |
429 | ||
f647962d MS |
430 | if (r < 0) |
431 | return log_error_errno(r, "Failed to read %s: %m", s->state_file); | |
9444b1f2 LP |
432 | |
433 | if (!s->user) { | |
434 | uid_t u; | |
435 | User *user; | |
436 | ||
437 | if (!uid) { | |
438 | log_error("UID not specified for session %s", s->id); | |
439 | return -ENOENT; | |
440 | } | |
441 | ||
442 | r = parse_uid(uid, &u); | |
443 | if (r < 0) { | |
444 | log_error("Failed to parse UID value %s for session %s.", uid, s->id); | |
445 | return r; | |
446 | } | |
447 | ||
8cb4ab00 | 448 | user = hashmap_get(s->manager->users, UID_TO_PTR(u)); |
9444b1f2 LP |
449 | if (!user) { |
450 | log_error("User of session %s not known.", s->id); | |
451 | return -ENOENT; | |
452 | } | |
453 | ||
454 | session_set_user(s, user); | |
455 | } | |
a185c5aa LP |
456 | |
457 | if (remote) { | |
458 | k = parse_boolean(remote); | |
459 | if (k >= 0) | |
460 | s->remote = k; | |
461 | } | |
462 | ||
c506027a DH |
463 | if (vtnr) |
464 | safe_atou(vtnr, &s->vtnr); | |
465 | ||
9418f147 | 466 | if (seat && !s->seat) { |
a185c5aa LP |
467 | Seat *o; |
468 | ||
469 | o = hashmap_get(s->manager->seats, seat); | |
470 | if (o) | |
c506027a DH |
471 | r = seat_attach_session(o, s); |
472 | if (!o || r < 0) | |
473 | log_error("Cannot attach session %s to seat %s", s->id, seat); | |
a185c5aa LP |
474 | } |
475 | ||
c506027a DH |
476 | if (!s->seat || !seat_has_vts(s->seat)) |
477 | s->vtnr = 0; | |
a185c5aa | 478 | |
e6494a07 | 479 | if (position && s->seat) { |
49e6fdbf DH |
480 | unsigned int npos; |
481 | ||
e6494a07 | 482 | safe_atou(position, &npos); |
49e6fdbf DH |
483 | seat_claim_position(s->seat, s, npos); |
484 | } | |
485 | ||
a185c5aa | 486 | if (leader) { |
238794b1 LP |
487 | pid_t pid; |
488 | ||
489 | r = parse_pid(leader, &pid); | |
490 | if (r < 0) | |
491 | log_debug_errno(r, "Failed to parse leader PID of session: %s", leader); | |
492 | else { | |
493 | r = session_set_leader(s, pid); | |
494 | if (r < 0) | |
495 | log_warning_errno(r, "Failed to set session leader PID, ignoring: %m"); | |
496 | } | |
a185c5aa LP |
497 | } |
498 | ||
a91e4e53 LP |
499 | if (type) { |
500 | SessionType t; | |
501 | ||
502 | t = session_type_from_string(type); | |
503 | if (t >= 0) | |
504 | s->type = t; | |
505 | } | |
506 | ||
55efac6c LP |
507 | if (class) { |
508 | SessionClass c; | |
509 | ||
510 | c = session_class_from_string(class); | |
511 | if (c >= 0) | |
512 | s->class = c; | |
513 | } | |
514 | ||
be94d954 MP |
515 | if (state && streq(state, "closing")) |
516 | s->stopping = true; | |
517 | ||
b4f78aea LP |
518 | if (s->fifo_path) { |
519 | int fd; | |
520 | ||
521 | /* If we open an unopened pipe for reading we will not | |
522 | get an EOF. to trigger an EOF we hence open it for | |
be94d954 MP |
523 | writing, but close it right away which then will |
524 | trigger the EOF. This will happen immediately if no | |
525 | other process has the FIFO open for writing, i. e. | |
526 | when the session died before logind (re)started. */ | |
b4f78aea LP |
527 | |
528 | fd = session_create_fifo(s); | |
03e334a1 | 529 | safe_close(fd); |
b4f78aea LP |
530 | } |
531 | ||
b895a735 BR |
532 | if (realtime) |
533 | timestamp_deserialize(realtime, &s->timestamp.realtime); | |
534 | if (monotonic) | |
535 | timestamp_deserialize(monotonic, &s->timestamp.monotonic); | |
a185c5aa | 536 | |
aed24c4c FB |
537 | if (active) { |
538 | k = parse_boolean(active); | |
539 | if (k >= 0) | |
540 | s->was_active = k; | |
541 | } | |
542 | ||
1c8280fd LP |
543 | if (is_display) { |
544 | /* Note that when enumerating users are loaded before sessions, hence the display session to use is | |
545 | * something we have to store along with the session and not the user, as in that case we couldn't | |
546 | * apply it at the time we load the user. */ | |
547 | ||
548 | k = parse_boolean(is_display); | |
549 | if (k < 0) | |
550 | log_warning_errno(k, "Failed to parse IS_DISPLAY session property: %m"); | |
551 | else if (k > 0) | |
552 | s->user->display = s; | |
553 | } | |
554 | ||
6d33772f | 555 | if (controller) { |
aed24c4c | 556 | if (bus_name_has_owner(s->manager->bus, controller, NULL) > 0) { |
dc6284e9 | 557 | session_set_controller(s, controller, false, false); |
aed24c4c FB |
558 | session_load_devices(s, devices); |
559 | } else | |
90a18413 | 560 | session_restore_vt(s); |
6d33772f DH |
561 | } |
562 | ||
a185c5aa | 563 | return r; |
20263082 LP |
564 | } |
565 | ||
566 | int session_activate(Session *s) { | |
d7bd01b5 DH |
567 | unsigned int num_pending; |
568 | ||
20263082 | 569 | assert(s); |
9444b1f2 | 570 | assert(s->user); |
20263082 | 571 | |
20263082 | 572 | if (!s->seat) |
15411c0c | 573 | return -EOPNOTSUPP; |
20263082 LP |
574 | |
575 | if (s->seat->active == s) | |
576 | return 0; | |
577 | ||
d7bd01b5 DH |
578 | /* on seats with VTs, we let VTs manage session-switching */ |
579 | if (seat_has_vts(s->seat)) { | |
709d0587 | 580 | if (s->vtnr == 0) |
15411c0c | 581 | return -EOPNOTSUPP; |
d7bd01b5 DH |
582 | |
583 | return chvt(s->vtnr); | |
584 | } | |
585 | ||
586 | /* On seats without VTs, we implement session-switching in logind. We | |
587 | * try to pause all session-devices and wait until the session | |
588 | * controller acknowledged them. Once all devices are asleep, we simply | |
589 | * switch the active session and be done. | |
590 | * We save the session we want to switch to in seat->pending_switch and | |
591 | * seat_complete_switch() will perform the final switch. */ | |
592 | ||
593 | s->seat->pending_switch = s; | |
594 | ||
595 | /* if no devices are running, immediately perform the session switch */ | |
596 | num_pending = session_device_try_pause_all(s); | |
597 | if (!num_pending) | |
598 | seat_complete_switch(s->seat); | |
20263082 | 599 | |
d7bd01b5 | 600 | return 0; |
20263082 LP |
601 | } |
602 | ||
25a1ab4e | 603 | static int session_start_scope(Session *s, sd_bus_message *properties, sd_bus_error *error) { |
98a28fef LP |
604 | int r; |
605 | ||
606 | assert(s); | |
9444b1f2 | 607 | assert(s->user); |
98a28fef | 608 | |
fb6becb4 | 609 | if (!s->scope) { |
fb2367ed | 610 | _cleanup_free_ char *scope = NULL; |
90558f31 | 611 | const char *description; |
405e0255 | 612 | |
25a1ab4e LP |
613 | s->scope_job = mfree(s->scope_job); |
614 | ||
605405c6 | 615 | scope = strjoin("session-", s->id, ".scope"); |
d0af76e6 | 616 | if (!scope) |
ae018d9b LP |
617 | return log_oom(); |
618 | ||
81d62103 | 619 | description = strjoina("Session ", s->id, " of user ", s->user->name); |
90558f31 LP |
620 | |
621 | r = manager_start_scope( | |
622 | s->manager, | |
623 | scope, | |
624 | s->leader, | |
625 | s->user->slice, | |
626 | description, | |
25a1ab4e LP |
627 | STRV_MAKE(s->user->runtime_dir_service, s->user->service), /* These two have StopWhenUnneeded= set, hence add a dep towards them */ |
628 | STRV_MAKE("systemd-logind.service", "systemd-user-sessions.service", s->user->runtime_dir_service, s->user->service), /* And order us after some more */ | |
22f93314 | 629 | properties, |
25a1ab4e LP |
630 | error, |
631 | &s->scope_job); | |
fb2367ed | 632 | if (r < 0) |
25a1ab4e | 633 | return log_error_errno(r, "Failed to start session scope %s: %s", scope, bus_error_message(error, r)); |
fb2367ed YW |
634 | |
635 | s->scope = TAKE_PTR(scope); | |
20263082 LP |
636 | } |
637 | ||
d0af76e6 | 638 | if (s->scope) |
90558f31 | 639 | (void) hashmap_put(s->manager->session_units, s->scope, s); |
d0af76e6 | 640 | |
20263082 LP |
641 | return 0; |
642 | } | |
643 | ||
25a1ab4e | 644 | int session_start(Session *s, sd_bus_message *properties, sd_bus_error *error) { |
20263082 LP |
645 | int r; |
646 | ||
647 | assert(s); | |
9444b1f2 LP |
648 | |
649 | if (!s->user) | |
650 | return -ESTALE; | |
20263082 | 651 | |
25a1ab4e LP |
652 | if (s->stopping) |
653 | return -EINVAL; | |
654 | ||
9418f147 LP |
655 | if (s->started) |
656 | return 0; | |
657 | ||
ed18b08b LP |
658 | r = user_start(s->user); |
659 | if (r < 0) | |
660 | return r; | |
661 | ||
25a1ab4e | 662 | r = session_start_scope(s, properties, error); |
fb6becb4 LP |
663 | if (r < 0) |
664 | return r; | |
665 | ||
d9eb81f9 | 666 | log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO, |
2b044526 | 667 | "MESSAGE_ID=" SD_MESSAGE_SESSION_START_STR, |
877d54e9 LP |
668 | "SESSION_ID=%s", s->id, |
669 | "USER_ID=%s", s->user->name, | |
de0671ee | 670 | "LEADER="PID_FMT, s->leader, |
a1230ff9 | 671 | LOG_MESSAGE("New session %s of user %s.", s->id, s->user->name)); |
98a28fef | 672 | |
9444b1f2 LP |
673 | if (!dual_timestamp_is_set(&s->timestamp)) |
674 | dual_timestamp_get(&s->timestamp); | |
14c3baca | 675 | |
e9816c48 LP |
676 | if (s->seat) |
677 | seat_read_active_vt(s->seat); | |
678 | ||
9418f147 LP |
679 | s->started = true; |
680 | ||
952d3260 LP |
681 | user_elect_display(s->user); |
682 | ||
5f41d1f1 | 683 | /* Save data */ |
e9816c48 | 684 | session_save(s); |
7f7bb946 | 685 | user_save(s->user); |
5f41d1f1 LP |
686 | if (s->seat) |
687 | seat_save(s->seat); | |
e9816c48 | 688 | |
5f41d1f1 | 689 | /* Send signals */ |
da119395 | 690 | session_send_signal(s, true); |
7d049e30 | 691 | user_send_changed(s->user, "Display", NULL); |
9418f147 LP |
692 | if (s->seat) { |
693 | if (s->seat->active == s) | |
7d049e30 | 694 | seat_send_changed(s->seat, "ActiveSession", NULL); |
9418f147 LP |
695 | } |
696 | ||
20263082 LP |
697 | return 0; |
698 | } | |
699 | ||
9bb69af4 | 700 | static int session_stop_scope(Session *s, bool force) { |
4afd3348 | 701 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; |
20263082 | 702 | int r; |
20263082 LP |
703 | |
704 | assert(s); | |
705 | ||
fb6becb4 LP |
706 | if (!s->scope) |
707 | return 0; | |
9b221b63 | 708 | |
756ed0e2 | 709 | /* Let's always abandon the scope first. This tells systemd that we are not interested anymore, and everything |
629ff674 | 710 | * that is left in the scope is "left-over". Informing systemd about this has the benefit that it will log |
756ed0e2 LP |
711 | * when killing any processes left after this point. */ |
712 | r = manager_abandon_scope(s->manager, s->scope, &error); | |
25a1ab4e | 713 | if (r < 0) { |
756ed0e2 | 714 | log_warning_errno(r, "Failed to abandon session scope, ignoring: %s", bus_error_message(&error, r)); |
25a1ab4e LP |
715 | sd_bus_error_free(&error); |
716 | } | |
717 | ||
718 | s->scope_job = mfree(s->scope_job); | |
756ed0e2 LP |
719 | |
720 | /* Optionally, let's kill everything that's left now. */ | |
9bb69af4 | 721 | if (force || manager_shall_kill(s->manager, s->user->name)) { |
801a884d | 722 | |
25a1ab4e LP |
723 | r = manager_stop_unit(s->manager, s->scope, &error, &s->scope_job); |
724 | if (r < 0) { | |
725 | if (force) | |
726 | return log_error_errno(r, "Failed to stop session scope: %s", bus_error_message(&error, r)); | |
20263082 | 727 | |
25a1ab4e LP |
728 | log_warning_errno(r, "Failed to stop session scope, ignoring: %s", bus_error_message(&error, r)); |
729 | } | |
8150acb1 | 730 | } else { |
20263082 | 731 | |
8150acb1 AJ |
732 | /* With no killing, this session is allowed to persist in "closing" state indefinitely. |
733 | * Therefore session stop and session removal may be two distinct events. | |
734 | * Session stop is quite significant on its own, let's log it. */ | |
735 | log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO, | |
736 | "SESSION_ID=%s", s->id, | |
737 | "USER_ID=%s", s->user->name, | |
738 | "LEADER="PID_FMT, s->leader, | |
f4cf1d66 | 739 | LOG_MESSAGE("Session %s logged out. Waiting for processes to exit.", s->id)); |
8150acb1 AJ |
740 | } |
741 | ||
9b221b63 | 742 | return 0; |
20263082 LP |
743 | } |
744 | ||
9bb69af4 | 745 | int session_stop(Session *s, bool force) { |
405e0255 LP |
746 | int r; |
747 | ||
748 | assert(s); | |
749 | ||
25a1ab4e LP |
750 | /* This is called whenever we begin with tearing down a session record. It's called in four cases: explicit API |
751 | * request via the bus (either directly for the session object or for the seat or user object this session | |
752 | * belongs to; 'force' is true), or due to automatic GC (i.e. scope vanished; 'force' is false), or because the | |
753 | * session FIFO saw an EOF ('force' is false), or because the release timer hit ('force' is false). */ | |
754 | ||
405e0255 LP |
755 | if (!s->user) |
756 | return -ESTALE; | |
25a1ab4e LP |
757 | if (!s->started) |
758 | return 0; | |
759 | if (s->stopping) | |
760 | return 0; | |
405e0255 | 761 | |
5f41d1f1 LP |
762 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
763 | ||
10189fd6 DH |
764 | if (s->seat) |
765 | seat_evict_position(s->seat, s); | |
766 | ||
5f41d1f1 LP |
767 | /* We are going down, don't care about FIFOs anymore */ |
768 | session_remove_fifo(s); | |
769 | ||
405e0255 | 770 | /* Kill cgroup */ |
9bb69af4 | 771 | r = session_stop_scope(s, force); |
405e0255 | 772 | |
5f41d1f1 LP |
773 | s->stopping = true; |
774 | ||
952d3260 LP |
775 | user_elect_display(s->user); |
776 | ||
405e0255 | 777 | session_save(s); |
cc377381 | 778 | user_save(s->user); |
405e0255 LP |
779 | |
780 | return r; | |
781 | } | |
782 | ||
783 | int session_finalize(Session *s) { | |
118ecf32 | 784 | SessionDevice *sd; |
20263082 LP |
785 | |
786 | assert(s); | |
787 | ||
9444b1f2 LP |
788 | if (!s->user) |
789 | return -ESTALE; | |
790 | ||
ed18b08b | 791 | if (s->started) |
d9eb81f9 | 792 | log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO, |
2b044526 | 793 | "MESSAGE_ID=" SD_MESSAGE_SESSION_STOP_STR, |
877d54e9 LP |
794 | "SESSION_ID=%s", s->id, |
795 | "USER_ID=%s", s->user->name, | |
de0671ee | 796 | "LEADER="PID_FMT, s->leader, |
a1230ff9 | 797 | LOG_MESSAGE("Removed session %s.", s->id)); |
98a28fef | 798 | |
5f41d1f1 LP |
799 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
800 | ||
10189fd6 DH |
801 | if (s->seat) |
802 | seat_evict_position(s->seat, s); | |
803 | ||
118ecf32 DH |
804 | /* Kill session devices */ |
805 | while ((sd = hashmap_first(s->devices))) | |
806 | session_device_free(sd); | |
807 | ||
491ac9f2 | 808 | (void) unlink(s->state_file); |
d2f92cdf | 809 | session_add_to_gc_queue(s); |
ed18b08b | 810 | user_add_to_gc_queue(s->user); |
14c3baca | 811 | |
405e0255 | 812 | if (s->started) { |
ed18b08b | 813 | session_send_signal(s, false); |
405e0255 LP |
814 | s->started = false; |
815 | } | |
50fb9793 | 816 | |
9418f147 LP |
817 | if (s->seat) { |
818 | if (s->seat->active == s) | |
819 | seat_set_active(s->seat, NULL); | |
820 | ||
23bd3b62 | 821 | seat_save(s->seat); |
9418f147 LP |
822 | } |
823 | ||
23bd3b62 | 824 | user_save(s->user); |
7d049e30 | 825 | user_send_changed(s->user, "Display", NULL); |
9418f147 | 826 | |
491ac9f2 | 827 | return 0; |
20263082 LP |
828 | } |
829 | ||
5f41d1f1 LP |
830 | static int release_timeout_callback(sd_event_source *es, uint64_t usec, void *userdata) { |
831 | Session *s = userdata; | |
832 | ||
833 | assert(es); | |
834 | assert(s); | |
835 | ||
9bb69af4 | 836 | session_stop(s, false); |
5f41d1f1 LP |
837 | return 0; |
838 | } | |
839 | ||
ad8780c9 | 840 | int session_release(Session *s) { |
5f41d1f1 LP |
841 | assert(s); |
842 | ||
843 | if (!s->started || s->stopping) | |
ad8780c9 ZJS |
844 | return 0; |
845 | ||
846 | if (s->timer_event_source) | |
847 | return 0; | |
848 | ||
849 | return sd_event_add_time(s->manager->event, | |
850 | &s->timer_event_source, | |
851 | CLOCK_MONOTONIC, | |
061c6607 | 852 | usec_add(now(CLOCK_MONOTONIC), RELEASE_USEC), 0, |
ad8780c9 | 853 | release_timeout_callback, s); |
5f41d1f1 LP |
854 | } |
855 | ||
20263082 LP |
856 | bool session_is_active(Session *s) { |
857 | assert(s); | |
858 | ||
859 | if (!s->seat) | |
860 | return true; | |
861 | ||
862 | return s->seat->active == s; | |
863 | } | |
864 | ||
23406ce5 LP |
865 | static int get_tty_atime(const char *tty, usec_t *atime) { |
866 | _cleanup_free_ char *p = NULL; | |
a185c5aa | 867 | struct stat st; |
23406ce5 LP |
868 | |
869 | assert(tty); | |
870 | assert(atime); | |
871 | ||
872 | if (!path_is_absolute(tty)) { | |
873 | p = strappend("/dev/", tty); | |
874 | if (!p) | |
875 | return -ENOMEM; | |
876 | ||
877 | tty = p; | |
878 | } else if (!path_startswith(tty, "/dev/")) | |
879 | return -ENOENT; | |
880 | ||
881 | if (lstat(tty, &st) < 0) | |
882 | return -errno; | |
883 | ||
884 | *atime = timespec_load(&st.st_atim); | |
885 | return 0; | |
886 | } | |
887 | ||
888 | static int get_process_ctty_atime(pid_t pid, usec_t *atime) { | |
889 | _cleanup_free_ char *p = NULL; | |
890 | int r; | |
891 | ||
892 | assert(pid > 0); | |
893 | assert(atime); | |
894 | ||
895 | r = get_ctty(pid, NULL, &p); | |
896 | if (r < 0) | |
897 | return r; | |
898 | ||
899 | return get_tty_atime(p, atime); | |
900 | } | |
901 | ||
902 | int session_get_idle_hint(Session *s, dual_timestamp *t) { | |
23406ce5 LP |
903 | usec_t atime = 0, n; |
904 | int r; | |
a185c5aa LP |
905 | |
906 | assert(s); | |
907 | ||
23406ce5 | 908 | /* Explicit idle hint is set */ |
a185c5aa LP |
909 | if (s->idle_hint) { |
910 | if (t) | |
911 | *t = s->idle_hint_timestamp; | |
912 | ||
913 | return s->idle_hint; | |
914 | } | |
915 | ||
0762eaa3 | 916 | /* Graphical sessions should really implement a real |
23406ce5 | 917 | * idle hint logic */ |
129baf1b | 918 | if (SESSION_TYPE_IS_GRAPHICAL(s->type)) |
a185c5aa LP |
919 | goto dont_know; |
920 | ||
23406ce5 LP |
921 | /* For sessions with an explicitly configured tty, let's check |
922 | * its atime */ | |
923 | if (s->tty) { | |
924 | r = get_tty_atime(s->tty, &atime); | |
925 | if (r >= 0) | |
926 | goto found_atime; | |
927 | } | |
a185c5aa | 928 | |
23406ce5 LP |
929 | /* For sessions with a leader but no explicitly configured |
930 | * tty, let's check the controlling tty of the leader */ | |
238794b1 | 931 | if (pid_is_valid(s->leader)) { |
23406ce5 LP |
932 | r = get_process_ctty_atime(s->leader, &atime); |
933 | if (r >= 0) | |
934 | goto found_atime; | |
a185c5aa LP |
935 | } |
936 | ||
a185c5aa LP |
937 | dont_know: |
938 | if (t) | |
939 | *t = s->idle_hint_timestamp; | |
940 | ||
941 | return 0; | |
23406ce5 LP |
942 | |
943 | found_atime: | |
944 | if (t) | |
945 | dual_timestamp_from_realtime(t, atime); | |
946 | ||
947 | n = now(CLOCK_REALTIME); | |
948 | ||
949 | if (s->manager->idle_action_usec <= 0) | |
950 | return 0; | |
951 | ||
952 | return atime + s->manager->idle_action_usec <= n; | |
a185c5aa LP |
953 | } |
954 | ||
bef422ae LP |
955 | void session_set_idle_hint(Session *s, bool b) { |
956 | assert(s); | |
957 | ||
958 | if (s->idle_hint == b) | |
959 | return; | |
960 | ||
961 | s->idle_hint = b; | |
962 | dual_timestamp_get(&s->idle_hint_timestamp); | |
9418f147 | 963 | |
cc377381 | 964 | session_send_changed(s, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); |
9418f147 LP |
965 | |
966 | if (s->seat) | |
cc377381 LP |
967 | seat_send_changed(s->seat, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); |
968 | ||
969 | user_send_changed(s->user, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); | |
970 | manager_send_changed(s->manager, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); | |
971 | } | |
972 | ||
42d35e13 VT |
973 | int session_get_locked_hint(Session *s) { |
974 | assert(s); | |
975 | ||
976 | return s->locked_hint; | |
977 | } | |
978 | ||
979 | void session_set_locked_hint(Session *s, bool b) { | |
980 | assert(s); | |
981 | ||
982 | if (s->locked_hint == b) | |
983 | return; | |
984 | ||
985 | s->locked_hint = b; | |
986 | ||
987 | session_send_changed(s, "LockedHint", NULL); | |
988 | } | |
989 | ||
cc377381 LP |
990 | static int session_dispatch_fifo(sd_event_source *es, int fd, uint32_t revents, void *userdata) { |
991 | Session *s = userdata; | |
992 | ||
993 | assert(s); | |
994 | assert(s->fifo_fd == fd); | |
995 | ||
996 | /* EOF on the FIFO means the session died abnormally. */ | |
997 | ||
998 | session_remove_fifo(s); | |
9bb69af4 | 999 | session_stop(s, false); |
cc377381 LP |
1000 | |
1001 | return 1; | |
bef422ae LP |
1002 | } |
1003 | ||
932e3ee7 LP |
1004 | int session_create_fifo(Session *s) { |
1005 | int r; | |
1006 | ||
31b79c2b LP |
1007 | assert(s); |
1008 | ||
b4f78aea | 1009 | /* Create FIFO */ |
932e3ee7 | 1010 | if (!s->fifo_path) { |
37c1d5e9 | 1011 | r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0, MKDIR_WARN_MODE); |
e6061ab2 LP |
1012 | if (r < 0) |
1013 | return r; | |
1014 | ||
d5ddc930 LP |
1015 | s->fifo_path = strjoin("/run/systemd/sessions/", s->id, ".ref"); |
1016 | if (!s->fifo_path) | |
932e3ee7 | 1017 | return -ENOMEM; |
31b79c2b | 1018 | |
932e3ee7 LP |
1019 | if (mkfifo(s->fifo_path, 0600) < 0 && errno != EEXIST) |
1020 | return -errno; | |
1021 | } | |
31b79c2b | 1022 | |
932e3ee7 | 1023 | /* Open reading side */ |
b4f78aea | 1024 | if (s->fifo_fd < 0) { |
db4a47e9 | 1025 | s->fifo_fd = open(s->fifo_path, O_RDONLY|O_CLOEXEC|O_NONBLOCK); |
b4f78aea LP |
1026 | if (s->fifo_fd < 0) |
1027 | return -errno; | |
cc377381 LP |
1028 | } |
1029 | ||
1030 | if (!s->fifo_event_source) { | |
151b9b96 | 1031 | r = sd_event_add_io(s->manager->event, &s->fifo_event_source, s->fifo_fd, 0, session_dispatch_fifo, s); |
b4f78aea LP |
1032 | if (r < 0) |
1033 | return r; | |
1034 | ||
e11544a8 LP |
1035 | /* Let's make sure we noticed dead sessions before we process new bus requests (which might create new |
1036 | * sessions). */ | |
1037 | r = sd_event_source_set_priority(s->fifo_event_source, SD_EVENT_PRIORITY_NORMAL-10); | |
cc377381 LP |
1038 | if (r < 0) |
1039 | return r; | |
b4f78aea | 1040 | } |
932e3ee7 LP |
1041 | |
1042 | /* Open writing side */ | |
db4a47e9 | 1043 | r = open(s->fifo_path, O_WRONLY|O_CLOEXEC|O_NONBLOCK); |
932e3ee7 LP |
1044 | if (r < 0) |
1045 | return -errno; | |
31b79c2b | 1046 | |
932e3ee7 LP |
1047 | return r; |
1048 | } | |
1049 | ||
5f41d1f1 | 1050 | static void session_remove_fifo(Session *s) { |
932e3ee7 LP |
1051 | assert(s); |
1052 | ||
03e334a1 LP |
1053 | s->fifo_event_source = sd_event_source_unref(s->fifo_event_source); |
1054 | s->fifo_fd = safe_close(s->fifo_fd); | |
932e3ee7 LP |
1055 | |
1056 | if (s->fifo_path) { | |
75bbdf47 | 1057 | (void) unlink(s->fifo_path); |
a1e58e8e | 1058 | s->fifo_path = mfree(s->fifo_path); |
932e3ee7 | 1059 | } |
31b79c2b LP |
1060 | } |
1061 | ||
5c093a23 | 1062 | bool session_may_gc(Session *s, bool drop_not_started) { |
bd26aee1 LP |
1063 | int r; |
1064 | ||
20263082 LP |
1065 | assert(s); |
1066 | ||
4a4b033f | 1067 | if (drop_not_started && !s->started) |
5c093a23 | 1068 | return true; |
932e3ee7 | 1069 | |
9444b1f2 | 1070 | if (!s->user) |
5c093a23 | 1071 | return true; |
9444b1f2 | 1072 | |
932e3ee7 | 1073 | if (s->fifo_fd >= 0) { |
5f41d1f1 | 1074 | if (pipe_eof(s->fifo_fd) <= 0) |
5c093a23 | 1075 | return false; |
20263082 LP |
1076 | } |
1077 | ||
bd26aee1 LP |
1078 | if (s->scope_job) { |
1079 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; | |
1080 | ||
1081 | r = manager_job_is_active(s->manager, s->scope_job, &error); | |
1082 | if (r < 0) | |
1083 | log_debug_errno(r, "Failed to determine whether job '%s' is pending, ignoring: %s", s->scope_job, bus_error_message(&error, r)); | |
1084 | if (r != 0) | |
1085 | return false; | |
1086 | } | |
20263082 | 1087 | |
bd26aee1 LP |
1088 | if (s->scope) { |
1089 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; | |
1090 | ||
1091 | r = manager_unit_is_active(s->manager, s->scope, &error); | |
1092 | if (r < 0) | |
1093 | log_debug_errno(r, "Failed to determine whether unit '%s' is active, ignoring: %s", s->scope, bus_error_message(&error, r)); | |
1094 | if (r != 0) | |
1095 | return false; | |
1096 | } | |
20263082 | 1097 | |
5c093a23 | 1098 | return true; |
20263082 LP |
1099 | } |
1100 | ||
14c3baca LP |
1101 | void session_add_to_gc_queue(Session *s) { |
1102 | assert(s); | |
1103 | ||
1104 | if (s->in_gc_queue) | |
1105 | return; | |
1106 | ||
71fda00f | 1107 | LIST_PREPEND(gc_queue, s->manager->session_gc_queue, s); |
14c3baca LP |
1108 | s->in_gc_queue = true; |
1109 | } | |
1110 | ||
0604381b LP |
1111 | SessionState session_get_state(Session *s) { |
1112 | assert(s); | |
1113 | ||
8fe63cd4 | 1114 | /* always check closing first */ |
5f41d1f1 LP |
1115 | if (s->stopping || s->timer_event_source) |
1116 | return SESSION_CLOSING; | |
1117 | ||
8fe63cd4 | 1118 | if (s->scope_job || s->fifo_fd < 0) |
405e0255 | 1119 | return SESSION_OPENING; |
fb6becb4 | 1120 | |
0604381b LP |
1121 | if (session_is_active(s)) |
1122 | return SESSION_ACTIVE; | |
1123 | ||
1124 | return SESSION_ONLINE; | |
1125 | } | |
1126 | ||
de07ab16 | 1127 | int session_kill(Session *s, KillWho who, int signo) { |
de07ab16 LP |
1128 | assert(s); |
1129 | ||
fb6becb4 | 1130 | if (!s->scope) |
de07ab16 LP |
1131 | return -ESRCH; |
1132 | ||
fb6becb4 | 1133 | return manager_kill_unit(s->manager, s->scope, who, signo, NULL); |
de07ab16 LP |
1134 | } |
1135 | ||
90a18413 | 1136 | static int session_open_vt(Session *s) { |
5f41d1f1 | 1137 | char path[sizeof("/dev/tty") + DECIMAL_STR_MAX(s->vtnr)]; |
90a18413 | 1138 | |
baccf3e4 OB |
1139 | if (s->vtnr < 1) |
1140 | return -ENODEV; | |
90a18413 DH |
1141 | |
1142 | if (s->vtfd >= 0) | |
1143 | return s->vtfd; | |
1144 | ||
92bd5ff3 | 1145 | sprintf(path, "/dev/tty%u", s->vtnr); |
22356953 | 1146 | s->vtfd = open_terminal(path, O_RDWR | O_CLOEXEC | O_NONBLOCK | O_NOCTTY); |
4a62c710 | 1147 | if (s->vtfd < 0) |
709f6e46 | 1148 | return log_error_errno(s->vtfd, "cannot open VT %s of session %s: %m", path, s->id); |
90a18413 DH |
1149 | |
1150 | return s->vtfd; | |
1151 | } | |
1152 | ||
baccf3e4 | 1153 | int session_prepare_vt(Session *s) { |
90a18413 DH |
1154 | int vt, r; |
1155 | struct vt_mode mode = { 0 }; | |
90a18413 | 1156 | |
baccf3e4 OB |
1157 | if (s->vtnr < 1) |
1158 | return 0; | |
1159 | ||
90a18413 DH |
1160 | vt = session_open_vt(s); |
1161 | if (vt < 0) | |
baccf3e4 | 1162 | return vt; |
90a18413 | 1163 | |
d6176c6c | 1164 | r = fchown(vt, s->user->uid, -1); |
baccf3e4 | 1165 | if (r < 0) { |
94c156cd LP |
1166 | r = log_error_errno(errno, |
1167 | "Cannot change owner of /dev/tty%u: %m", | |
1168 | s->vtnr); | |
d6176c6c | 1169 | goto error; |
baccf3e4 | 1170 | } |
d6176c6c | 1171 | |
90a18413 | 1172 | r = ioctl(vt, KDSKBMODE, K_OFF); |
baccf3e4 | 1173 | if (r < 0) { |
94c156cd LP |
1174 | r = log_error_errno(errno, |
1175 | "Cannot set K_OFF on /dev/tty%u: %m", | |
1176 | s->vtnr); | |
90a18413 | 1177 | goto error; |
baccf3e4 | 1178 | } |
90a18413 DH |
1179 | |
1180 | r = ioctl(vt, KDSETMODE, KD_GRAPHICS); | |
baccf3e4 | 1181 | if (r < 0) { |
94c156cd LP |
1182 | r = log_error_errno(errno, |
1183 | "Cannot set KD_GRAPHICS on /dev/tty%u: %m", | |
1184 | s->vtnr); | |
90a18413 | 1185 | goto error; |
baccf3e4 | 1186 | } |
90a18413 | 1187 | |
90a18413 DH |
1188 | /* Oh, thanks to the VT layer, VT_AUTO does not work with KD_GRAPHICS. |
1189 | * So we need a dummy handler here which just acknowledges *all* VT | |
1190 | * switch requests. */ | |
1191 | mode.mode = VT_PROCESS; | |
92683ad2 DH |
1192 | mode.relsig = SIGRTMIN; |
1193 | mode.acqsig = SIGRTMIN + 1; | |
90a18413 | 1194 | r = ioctl(vt, VT_SETMODE, &mode); |
baccf3e4 | 1195 | if (r < 0) { |
94c156cd LP |
1196 | r = log_error_errno(errno, |
1197 | "Cannot set VT_PROCESS on /dev/tty%u: %m", | |
1198 | s->vtnr); | |
90a18413 | 1199 | goto error; |
baccf3e4 | 1200 | } |
90a18413 | 1201 | |
baccf3e4 | 1202 | return 0; |
90a18413 DH |
1203 | |
1204 | error: | |
90a18413 | 1205 | session_restore_vt(s); |
baccf3e4 | 1206 | return r; |
90a18413 DH |
1207 | } |
1208 | ||
1209 | void session_restore_vt(Session *s) { | |
16597ac3 LP |
1210 | |
1211 | static const struct vt_mode mode = { | |
1212 | .mode = VT_AUTO, | |
1213 | }; | |
1214 | ||
c83f349c | 1215 | int vt, old_fd; |
90a18413 | 1216 | |
128df4cf OT |
1217 | /* We need to get a fresh handle to the virtual terminal, |
1218 | * since the old file-descriptor is potentially in a hung-up | |
1219 | * state after the controlling process exited; we do a | |
1220 | * little dance to avoid having the terminal be available | |
1221 | * for reuse before we've cleaned it up. | |
1222 | */ | |
c10d6bdb | 1223 | old_fd = TAKE_FD(s->vtfd); |
128df4cf | 1224 | |
90a18413 | 1225 | vt = session_open_vt(s); |
128df4cf OT |
1226 | safe_close(old_fd); |
1227 | ||
90a18413 DH |
1228 | if (vt < 0) |
1229 | return; | |
1230 | ||
2bf10523 | 1231 | (void) ioctl(vt, KDSETMODE, KD_TEXT); |
90a18413 | 1232 | |
c83f349c | 1233 | (void) vt_reset_keyboard(vt); |
90a18413 | 1234 | |
2bf10523 | 1235 | (void) ioctl(vt, VT_SETMODE, &mode); |
16597ac3 | 1236 | (void) fchown(vt, 0, (gid_t) -1); |
d6176c6c | 1237 | |
03e334a1 | 1238 | s->vtfd = safe_close(s->vtfd); |
90a18413 DH |
1239 | } |
1240 | ||
2ec3ff66 | 1241 | void session_leave_vt(Session *s) { |
ce540a24 DH |
1242 | int r; |
1243 | ||
2ec3ff66 DH |
1244 | assert(s); |
1245 | ||
1246 | /* This is called whenever we get a VT-switch signal from the kernel. | |
1247 | * We acknowledge all of them unconditionally. Note that session are | |
1248 | * free to overwrite those handlers and we only register them for | |
1249 | * sessions with controllers. Legacy sessions are not affected. | |
1250 | * However, if we switch from a non-legacy to a legacy session, we must | |
1251 | * make sure to pause all device before acknowledging the switch. We | |
1252 | * process the real switch only after we are notified via sysfs, so the | |
1253 | * legacy session might have already started using the devices. If we | |
1254 | * don't pause the devices before the switch, we might confuse the | |
1255 | * session we switch to. */ | |
1256 | ||
1257 | if (s->vtfd < 0) | |
1258 | return; | |
1259 | ||
1260 | session_device_pause_all(s); | |
ce540a24 DH |
1261 | r = ioctl(s->vtfd, VT_RELDISP, 1); |
1262 | if (r < 0) | |
56f64d95 | 1263 | log_debug_errno(errno, "Cannot release VT of session %s: %m", s->id); |
2ec3ff66 DH |
1264 | } |
1265 | ||
cc377381 | 1266 | bool session_is_controller(Session *s, const char *sender) { |
ae5e06bd DH |
1267 | assert(s); |
1268 | ||
1269 | return streq_ptr(s->controller, sender); | |
1270 | } | |
1271 | ||
b12e5615 DH |
1272 | static void session_release_controller(Session *s, bool notify) { |
1273 | _cleanup_free_ char *name = NULL; | |
6d33772f DH |
1274 | SessionDevice *sd; |
1275 | ||
b12e5615 DH |
1276 | if (!s->controller) |
1277 | return; | |
6d33772f | 1278 | |
b12e5615 | 1279 | name = s->controller; |
90a18413 | 1280 | |
b12e5615 DH |
1281 | /* By resetting the controller before releasing the devices, we won't |
1282 | * send notification signals. This avoids sending useless notifications | |
1283 | * if the controller is released on disconnects. */ | |
1284 | if (!notify) | |
1285 | s->controller = NULL; | |
6d33772f | 1286 | |
b12e5615 DH |
1287 | while ((sd = hashmap_first(s->devices))) |
1288 | session_device_free(sd); | |
1289 | ||
1290 | s->controller = NULL; | |
3cde9e8f DM |
1291 | s->track = sd_bus_track_unref(s->track); |
1292 | } | |
1293 | ||
1294 | static int on_bus_track(sd_bus_track *track, void *userdata) { | |
1295 | Session *s = userdata; | |
1296 | ||
1297 | assert(track); | |
1298 | assert(s); | |
1299 | ||
1300 | session_drop_controller(s); | |
1301 | ||
1302 | return 0; | |
6d33772f DH |
1303 | } |
1304 | ||
dc6284e9 | 1305 | int session_set_controller(Session *s, const char *sender, bool force, bool prepare) { |
b12e5615 | 1306 | _cleanup_free_ char *name = NULL; |
ae5e06bd DH |
1307 | int r; |
1308 | ||
1309 | assert(s); | |
1310 | assert(sender); | |
1311 | ||
1312 | if (session_is_controller(s, sender)) | |
1313 | return 0; | |
1314 | if (s->controller && !force) | |
1315 | return -EBUSY; | |
1316 | ||
b12e5615 DH |
1317 | name = strdup(sender); |
1318 | if (!name) | |
ae5e06bd DH |
1319 | return -ENOMEM; |
1320 | ||
3cde9e8f DM |
1321 | s->track = sd_bus_track_unref(s->track); |
1322 | r = sd_bus_track_new(s->manager->bus, &s->track, on_bus_track, s); | |
1323 | if (r < 0) | |
1324 | return r; | |
1325 | ||
1326 | r = sd_bus_track_add_name(s->track, name); | |
1327 | if (r < 0) | |
ae5e06bd | 1328 | return r; |
ae5e06bd | 1329 | |
90a18413 DH |
1330 | /* When setting a session controller, we forcibly mute the VT and set |
1331 | * it into graphics-mode. Applications can override that by changing | |
1332 | * VT state after calling TakeControl(). However, this serves as a good | |
1333 | * default and well-behaving controllers can now ignore VTs entirely. | |
1334 | * Note that we reset the VT on ReleaseControl() and if the controller | |
1335 | * exits. | |
1336 | * If logind crashes/restarts, we restore the controller during restart | |
dc6284e9 FB |
1337 | * (without preparing the VT since the controller has probably overridden |
1338 | * VT state by now) or reset the VT in case it crashed/exited, too. */ | |
1339 | if (prepare) { | |
1340 | r = session_prepare_vt(s); | |
1341 | if (r < 0) { | |
1342 | s->track = sd_bus_track_unref(s->track); | |
1343 | return r; | |
1344 | } | |
13f493dc | 1345 | } |
baccf3e4 | 1346 | |
b12e5615 | 1347 | session_release_controller(s, true); |
ae2a15bc | 1348 | s->controller = TAKE_PTR(name); |
b12e5615 | 1349 | session_save(s); |
90a18413 | 1350 | |
ae5e06bd DH |
1351 | return 0; |
1352 | } | |
1353 | ||
1354 | void session_drop_controller(Session *s) { | |
1355 | assert(s); | |
1356 | ||
1357 | if (!s->controller) | |
1358 | return; | |
1359 | ||
3cde9e8f | 1360 | s->track = sd_bus_track_unref(s->track); |
b12e5615 DH |
1361 | session_release_controller(s, false); |
1362 | session_save(s); | |
1363 | session_restore_vt(s); | |
ae5e06bd DH |
1364 | } |
1365 | ||
fb6becb4 LP |
1366 | static const char* const session_state_table[_SESSION_STATE_MAX] = { |
1367 | [SESSION_OPENING] = "opening", | |
0604381b LP |
1368 | [SESSION_ONLINE] = "online", |
1369 | [SESSION_ACTIVE] = "active", | |
1370 | [SESSION_CLOSING] = "closing" | |
1371 | }; | |
1372 | ||
1373 | DEFINE_STRING_TABLE_LOOKUP(session_state, SessionState); | |
1374 | ||
20263082 | 1375 | static const char* const session_type_table[_SESSION_TYPE_MAX] = { |
2c5859af | 1376 | [SESSION_UNSPECIFIED] = "unspecified", |
3f49d45a | 1377 | [SESSION_TTY] = "tty", |
98a28fef | 1378 | [SESSION_X11] = "x11", |
d9eb81f9 | 1379 | [SESSION_WAYLAND] = "wayland", |
9541666b | 1380 | [SESSION_MIR] = "mir", |
e9e74f28 | 1381 | [SESSION_WEB] = "web", |
20263082 LP |
1382 | }; |
1383 | ||
1384 | DEFINE_STRING_TABLE_LOOKUP(session_type, SessionType); | |
de07ab16 | 1385 | |
55efac6c LP |
1386 | static const char* const session_class_table[_SESSION_CLASS_MAX] = { |
1387 | [SESSION_USER] = "user", | |
1388 | [SESSION_GREETER] = "greeter", | |
e2acb67b LP |
1389 | [SESSION_LOCK_SCREEN] = "lock-screen", |
1390 | [SESSION_BACKGROUND] = "background" | |
55efac6c LP |
1391 | }; |
1392 | ||
1393 | DEFINE_STRING_TABLE_LOOKUP(session_class, SessionClass); | |
1394 | ||
de07ab16 LP |
1395 | static const char* const kill_who_table[_KILL_WHO_MAX] = { |
1396 | [KILL_LEADER] = "leader", | |
1397 | [KILL_ALL] = "all" | |
1398 | }; | |
1399 | ||
1400 | DEFINE_STRING_TABLE_LOOKUP(kill_who, KillWho); |