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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" |
d68c645b | 29 | #include "serialize.h" |
8b43440b | 30 | #include "string-table.h" |
25a1ab4e | 31 | #include "strv.h" |
288a74cc | 32 | #include "terminal-util.h" |
b1d4f8e1 | 33 | #include "user-util.h" |
4f5dd394 | 34 | #include "util.h" |
20263082 | 35 | |
5f41d1f1 LP |
36 | #define RELEASE_USEC (20*USEC_PER_SEC) |
37 | ||
38 | static void session_remove_fifo(Session *s); | |
0212126c | 39 | static void session_restore_vt(Session *s); |
5f41d1f1 | 40 | |
8c29a457 LP |
41 | int session_new(Session **ret, Manager *m, const char *id) { |
42 | _cleanup_(session_freep) Session *s = NULL; | |
43 | int r; | |
20263082 | 44 | |
8c29a457 | 45 | assert(ret); |
20263082 LP |
46 | assert(m); |
47 | assert(id); | |
48 | ||
8c29a457 LP |
49 | if (!session_id_valid(id)) |
50 | return -EINVAL; | |
51 | ||
52 | s = new(Session, 1); | |
20263082 | 53 | if (!s) |
8c29a457 LP |
54 | return -ENOMEM; |
55 | ||
56 | *s = (Session) { | |
57 | .manager = m, | |
58 | .fifo_fd = -1, | |
59 | .vtfd = -1, | |
60 | .audit_id = AUDIT_SESSION_INVALID, | |
3d0ef5c7 | 61 | .tty_validity = _TTY_VALIDITY_INVALID, |
8c29a457 | 62 | }; |
20263082 | 63 | |
98a28fef | 64 | s->state_file = strappend("/run/systemd/sessions/", id); |
6b430fdb | 65 | if (!s->state_file) |
8c29a457 | 66 | return -ENOMEM; |
118ecf32 | 67 | |
2b6bf07d | 68 | s->id = basename(s->state_file); |
20263082 | 69 | |
8c29a457 LP |
70 | s->devices = hashmap_new(&devt_hash_ops); |
71 | if (!s->devices) | |
72 | return -ENOMEM; | |
20263082 | 73 | |
8c29a457 LP |
74 | r = hashmap_put(m->sessions, s->id, s); |
75 | if (r < 0) | |
76 | return r; | |
20263082 | 77 | |
8c29a457 LP |
78 | *ret = TAKE_PTR(s); |
79 | return 0; | |
20263082 LP |
80 | } |
81 | ||
8c29a457 | 82 | Session* session_free(Session *s) { |
118ecf32 DH |
83 | SessionDevice *sd; |
84 | ||
8c29a457 LP |
85 | if (!s) |
86 | return NULL; | |
20263082 | 87 | |
14c3baca | 88 | if (s->in_gc_queue) |
71fda00f | 89 | LIST_REMOVE(gc_queue, s->manager->session_gc_queue, s); |
14c3baca | 90 | |
5f41d1f1 LP |
91 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
92 | ||
cc377381 LP |
93 | session_remove_fifo(s); |
94 | ||
ae5e06bd DH |
95 | session_drop_controller(s); |
96 | ||
118ecf32 DH |
97 | while ((sd = hashmap_first(s->devices))) |
98 | session_device_free(sd); | |
99 | ||
100 | hashmap_free(s->devices); | |
101 | ||
20263082 | 102 | if (s->user) { |
71fda00f | 103 | LIST_REMOVE(sessions_by_user, s->user->sessions, s); |
20263082 LP |
104 | |
105 | if (s->user->display == s) | |
106 | s->user->display = NULL; | |
9afe9efb LP |
107 | |
108 | user_update_last_session_timer(s->user); | |
20263082 LP |
109 | } |
110 | ||
9418f147 LP |
111 | if (s->seat) { |
112 | if (s->seat->active == s) | |
113 | s->seat->active = NULL; | |
d7bd01b5 DH |
114 | if (s->seat->pending_switch == s) |
115 | s->seat->pending_switch = NULL; | |
9418f147 | 116 | |
49e6fdbf | 117 | seat_evict_position(s->seat, s); |
71fda00f | 118 | LIST_REMOVE(sessions_by_seat, s->seat->sessions, s); |
9418f147 | 119 | } |
20263082 | 120 | |
fb6becb4 LP |
121 | if (s->scope) { |
122 | hashmap_remove(s->manager->session_units, s->scope); | |
123 | free(s->scope); | |
124 | } | |
125 | ||
238794b1 LP |
126 | if (pid_is_valid(s->leader)) |
127 | (void) hashmap_remove_value(s->manager->sessions_by_leader, PID_TO_PTR(s->leader), s); | |
128 | ||
fb6becb4 | 129 | free(s->scope_job); |
1713813d | 130 | |
cc377381 | 131 | sd_bus_message_unref(s->create_message); |
20263082 LP |
132 | |
133 | free(s->tty); | |
134 | free(s->display); | |
135 | free(s->remote_host); | |
3f49d45a | 136 | free(s->remote_user); |
98a28fef | 137 | free(s->service); |
a4cd87e9 | 138 | free(s->desktop); |
20263082 LP |
139 | |
140 | hashmap_remove(s->manager->sessions, s->id); | |
98a28fef | 141 | |
d2f92cdf | 142 | free(s->state_file); |
8c29a457 LP |
143 | |
144 | return mfree(s); | |
20263082 LP |
145 | } |
146 | ||
9444b1f2 LP |
147 | void session_set_user(Session *s, User *u) { |
148 | assert(s); | |
149 | assert(!s->user); | |
150 | ||
151 | s->user = u; | |
71fda00f | 152 | LIST_PREPEND(sessions_by_user, u->sessions, s); |
9afe9efb LP |
153 | |
154 | user_update_last_session_timer(u); | |
9444b1f2 LP |
155 | } |
156 | ||
238794b1 LP |
157 | int session_set_leader(Session *s, pid_t pid) { |
158 | int r; | |
159 | ||
160 | assert(s); | |
161 | ||
162 | if (!pid_is_valid(pid)) | |
163 | return -EINVAL; | |
164 | ||
165 | if (s->leader == pid) | |
166 | return 0; | |
167 | ||
168 | r = hashmap_put(s->manager->sessions_by_leader, PID_TO_PTR(pid), s); | |
169 | if (r < 0) | |
170 | return r; | |
171 | ||
172 | if (pid_is_valid(s->leader)) | |
173 | (void) hashmap_remove_value(s->manager->sessions_by_leader, PID_TO_PTR(s->leader), s); | |
174 | ||
175 | s->leader = pid; | |
176 | (void) audit_session_from_pid(pid, &s->audit_id); | |
177 | ||
178 | return 1; | |
179 | } | |
180 | ||
aed24c4c FB |
181 | static void session_save_devices(Session *s, FILE *f) { |
182 | SessionDevice *sd; | |
183 | Iterator i; | |
184 | ||
185 | if (!hashmap_isempty(s->devices)) { | |
186 | fprintf(f, "DEVICES="); | |
187 | HASHMAP_FOREACH(sd, s->devices, i) | |
188 | fprintf(f, "%u:%u ", major(sd->dev), minor(sd->dev)); | |
189 | fprintf(f, "\n"); | |
190 | } | |
191 | } | |
192 | ||
20263082 | 193 | int session_save(Session *s) { |
507f22bd | 194 | _cleanup_free_ char *temp_path = NULL; |
cc377381 | 195 | _cleanup_fclose_ FILE *f = NULL; |
20263082 LP |
196 | int r = 0; |
197 | ||
198 | assert(s); | |
199 | ||
9444b1f2 LP |
200 | if (!s->user) |
201 | return -ESTALE; | |
202 | ||
accaeded LP |
203 | if (!s->started) |
204 | return 0; | |
205 | ||
37c1d5e9 | 206 | r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0, MKDIR_WARN_MODE); |
20263082 | 207 | if (r < 0) |
dacd6cee | 208 | goto fail; |
20263082 | 209 | |
14c3baca LP |
210 | r = fopen_temporary(s->state_file, &f, &temp_path); |
211 | if (r < 0) | |
dacd6cee | 212 | goto fail; |
20263082 | 213 | |
44176400 LP |
214 | (void) __fsetlocking(f, FSETLOCKING_BYCALLER); |
215 | (void) fchmod(fileno(f), 0644); | |
14c3baca | 216 | |
20263082 LP |
217 | fprintf(f, |
218 | "# This is private data. Do not parse.\n" | |
90b2de37 | 219 | "UID="UID_FMT"\n" |
20263082 LP |
220 | "USER=%s\n" |
221 | "ACTIVE=%i\n" | |
1c8280fd | 222 | "IS_DISPLAY=%i\n" |
0604381b | 223 | "STATE=%s\n" |
fb6becb4 | 224 | "REMOTE=%i\n", |
90b2de37 | 225 | s->user->uid, |
20263082 LP |
226 | s->user->name, |
227 | session_is_active(s), | |
1c8280fd | 228 | s->user->display == s, |
0604381b | 229 | session_state_to_string(session_get_state(s)), |
fb6becb4 | 230 | s->remote); |
20263082 | 231 | |
a91e4e53 | 232 | if (s->type >= 0) |
507f22bd | 233 | fprintf(f, "TYPE=%s\n", session_type_to_string(s->type)); |
a91e4e53 | 234 | |
55efac6c | 235 | if (s->class >= 0) |
507f22bd | 236 | fprintf(f, "CLASS=%s\n", session_class_to_string(s->class)); |
55efac6c | 237 | |
fb6becb4 LP |
238 | if (s->scope) |
239 | fprintf(f, "SCOPE=%s\n", s->scope); | |
fb6becb4 LP |
240 | if (s->scope_job) |
241 | fprintf(f, "SCOPE_JOB=%s\n", s->scope_job); | |
20263082 | 242 | |
932e3ee7 | 243 | if (s->fifo_path) |
507f22bd | 244 | fprintf(f, "FIFO=%s\n", s->fifo_path); |
932e3ee7 | 245 | |
20263082 | 246 | if (s->seat) |
507f22bd | 247 | fprintf(f, "SEAT=%s\n", s->seat->id); |
20263082 LP |
248 | |
249 | if (s->tty) | |
507f22bd | 250 | fprintf(f, "TTY=%s\n", s->tty); |
20263082 | 251 | |
3d0ef5c7 LP |
252 | if (s->tty_validity >= 0) |
253 | fprintf(f, "TTY_VALIDITY=%s\n", tty_validity_to_string(s->tty_validity)); | |
254 | ||
20263082 | 255 | if (s->display) |
507f22bd | 256 | fprintf(f, "DISPLAY=%s\n", s->display); |
20263082 | 257 | |
558c6490 LP |
258 | if (s->remote_host) { |
259 | _cleanup_free_ char *escaped; | |
260 | ||
261 | escaped = cescape(s->remote_host); | |
262 | if (!escaped) { | |
263 | r = -ENOMEM; | |
dacd6cee | 264 | goto fail; |
558c6490 LP |
265 | } |
266 | ||
267 | fprintf(f, "REMOTE_HOST=%s\n", escaped); | |
268 | } | |
269 | ||
270 | if (s->remote_user) { | |
271 | _cleanup_free_ char *escaped; | |
272 | ||
273 | escaped = cescape(s->remote_user); | |
274 | if (!escaped) { | |
275 | r = -ENOMEM; | |
dacd6cee | 276 | goto fail; |
558c6490 LP |
277 | } |
278 | ||
279 | fprintf(f, "REMOTE_USER=%s\n", escaped); | |
280 | } | |
281 | ||
282 | if (s->service) { | |
283 | _cleanup_free_ char *escaped; | |
20263082 | 284 | |
558c6490 LP |
285 | escaped = cescape(s->service); |
286 | if (!escaped) { | |
287 | r = -ENOMEM; | |
dacd6cee | 288 | goto fail; |
558c6490 LP |
289 | } |
290 | ||
291 | fprintf(f, "SERVICE=%s\n", escaped); | |
292 | } | |
3f49d45a | 293 | |
558c6490 LP |
294 | if (s->desktop) { |
295 | _cleanup_free_ char *escaped; | |
98a28fef | 296 | |
558c6490 LP |
297 | escaped = cescape(s->desktop); |
298 | if (!escaped) { | |
299 | r = -ENOMEM; | |
dacd6cee | 300 | goto fail; |
558c6490 LP |
301 | } |
302 | ||
303 | fprintf(f, "DESKTOP=%s\n", escaped); | |
304 | } | |
a4cd87e9 | 305 | |
bf7825ae | 306 | if (s->seat && seat_has_vts(s->seat)) |
92bd5ff3 | 307 | fprintf(f, "VTNR=%u\n", s->vtnr); |
20263082 | 308 | |
49e6fdbf | 309 | if (!s->vtnr) |
e6494a07 | 310 | fprintf(f, "POSITION=%u\n", s->position); |
49e6fdbf | 311 | |
54191eb3 | 312 | if (pid_is_valid(s->leader)) |
90b2de37 | 313 | fprintf(f, "LEADER="PID_FMT"\n", s->leader); |
20263082 | 314 | |
3a87a86e | 315 | if (audit_session_is_valid(s->audit_id)) |
507f22bd | 316 | fprintf(f, "AUDIT=%"PRIu32"\n", s->audit_id); |
20263082 | 317 | |
9444b1f2 LP |
318 | if (dual_timestamp_is_set(&s->timestamp)) |
319 | fprintf(f, | |
90b2de37 ZJS |
320 | "REALTIME="USEC_FMT"\n" |
321 | "MONOTONIC="USEC_FMT"\n", | |
322 | s->timestamp.realtime, | |
323 | s->timestamp.monotonic); | |
9444b1f2 | 324 | |
aed24c4c | 325 | if (s->controller) { |
6d33772f | 326 | fprintf(f, "CONTROLLER=%s\n", s->controller); |
aed24c4c FB |
327 | session_save_devices(s, f); |
328 | } | |
6d33772f | 329 | |
dacd6cee LP |
330 | r = fflush_and_check(f); |
331 | if (r < 0) | |
332 | goto fail; | |
14c3baca | 333 | |
dacd6cee | 334 | if (rename(temp_path, s->state_file) < 0) { |
20263082 | 335 | r = -errno; |
dacd6cee | 336 | goto fail; |
20263082 LP |
337 | } |
338 | ||
dacd6cee LP |
339 | return 0; |
340 | ||
341 | fail: | |
342 | (void) unlink(s->state_file); | |
14c3baca | 343 | |
dacd6cee LP |
344 | if (temp_path) |
345 | (void) unlink(temp_path); | |
346 | ||
347 | return log_error_errno(r, "Failed to save session data %s: %m", s->state_file); | |
20263082 LP |
348 | } |
349 | ||
aed24c4c FB |
350 | static int session_load_devices(Session *s, const char *devices) { |
351 | const char *p; | |
352 | int r = 0; | |
353 | ||
354 | assert(s); | |
355 | ||
356 | for (p = devices;;) { | |
357 | _cleanup_free_ char *word = NULL; | |
358 | SessionDevice *sd; | |
359 | dev_t dev; | |
360 | int k; | |
361 | ||
362 | k = extract_first_word(&p, &word, NULL, 0); | |
363 | if (k == 0) | |
364 | break; | |
365 | if (k < 0) { | |
366 | r = k; | |
367 | break; | |
368 | } | |
369 | ||
370 | k = parse_dev(word, &dev); | |
371 | if (k < 0) { | |
372 | r = k; | |
373 | continue; | |
374 | } | |
375 | ||
376 | /* The file descriptors for loaded devices will be reattached later. */ | |
377 | k = session_device_new(s, dev, false, &sd); | |
378 | if (k < 0) | |
379 | r = k; | |
380 | } | |
381 | ||
382 | if (r < 0) | |
383 | log_error_errno(r, "Loading session devices for session %s failed: %m", s->id); | |
384 | ||
385 | return r; | |
386 | } | |
dacd6cee | 387 | |
20263082 | 388 | int session_load(Session *s) { |
9444b1f2 | 389 | _cleanup_free_ char *remote = NULL, |
a185c5aa | 390 | *seat = NULL, |
3d0ef5c7 | 391 | *tty_validity = NULL, |
a185c5aa | 392 | *vtnr = NULL, |
be94d954 | 393 | *state = NULL, |
e6494a07 | 394 | *position = NULL, |
a185c5aa | 395 | *leader = NULL, |
55efac6c | 396 | *type = NULL, |
9444b1f2 LP |
397 | *class = NULL, |
398 | *uid = NULL, | |
399 | *realtime = NULL, | |
6d33772f | 400 | *monotonic = NULL, |
aed24c4c FB |
401 | *controller = NULL, |
402 | *active = NULL, | |
1c8280fd LP |
403 | *devices = NULL, |
404 | *is_display = NULL; | |
a185c5aa LP |
405 | |
406 | int k, r; | |
407 | ||
20263082 LP |
408 | assert(s); |
409 | ||
aa8fbc74 | 410 | r = parse_env_file(NULL, s->state_file, |
a185c5aa | 411 | "REMOTE", &remote, |
fb6becb4 LP |
412 | "SCOPE", &s->scope, |
413 | "SCOPE_JOB", &s->scope_job, | |
932e3ee7 | 414 | "FIFO", &s->fifo_path, |
a185c5aa LP |
415 | "SEAT", &seat, |
416 | "TTY", &s->tty, | |
3d0ef5c7 | 417 | "TTY_VALIDITY", &tty_validity, |
a185c5aa LP |
418 | "DISPLAY", &s->display, |
419 | "REMOTE_HOST", &s->remote_host, | |
420 | "REMOTE_USER", &s->remote_user, | |
98a28fef | 421 | "SERVICE", &s->service, |
a4cd87e9 | 422 | "DESKTOP", &s->desktop, |
a185c5aa | 423 | "VTNR", &vtnr, |
be94d954 | 424 | "STATE", &state, |
e6494a07 | 425 | "POSITION", &position, |
a185c5aa | 426 | "LEADER", &leader, |
a91e4e53 | 427 | "TYPE", &type, |
55efac6c | 428 | "CLASS", &class, |
9444b1f2 LP |
429 | "UID", &uid, |
430 | "REALTIME", &realtime, | |
431 | "MONOTONIC", &monotonic, | |
6d33772f | 432 | "CONTROLLER", &controller, |
aed24c4c FB |
433 | "ACTIVE", &active, |
434 | "DEVICES", &devices, | |
13df9c39 | 435 | "IS_DISPLAY", &is_display); |
a185c5aa | 436 | |
f647962d MS |
437 | if (r < 0) |
438 | return log_error_errno(r, "Failed to read %s: %m", s->state_file); | |
9444b1f2 LP |
439 | |
440 | if (!s->user) { | |
441 | uid_t u; | |
442 | User *user; | |
443 | ||
444 | if (!uid) { | |
445 | log_error("UID not specified for session %s", s->id); | |
446 | return -ENOENT; | |
447 | } | |
448 | ||
449 | r = parse_uid(uid, &u); | |
450 | if (r < 0) { | |
451 | log_error("Failed to parse UID value %s for session %s.", uid, s->id); | |
452 | return r; | |
453 | } | |
454 | ||
8cb4ab00 | 455 | user = hashmap_get(s->manager->users, UID_TO_PTR(u)); |
9444b1f2 LP |
456 | if (!user) { |
457 | log_error("User of session %s not known.", s->id); | |
458 | return -ENOENT; | |
459 | } | |
460 | ||
461 | session_set_user(s, user); | |
462 | } | |
a185c5aa LP |
463 | |
464 | if (remote) { | |
465 | k = parse_boolean(remote); | |
466 | if (k >= 0) | |
467 | s->remote = k; | |
468 | } | |
469 | ||
c506027a DH |
470 | if (vtnr) |
471 | safe_atou(vtnr, &s->vtnr); | |
472 | ||
9418f147 | 473 | if (seat && !s->seat) { |
a185c5aa LP |
474 | Seat *o; |
475 | ||
476 | o = hashmap_get(s->manager->seats, seat); | |
477 | if (o) | |
c506027a DH |
478 | r = seat_attach_session(o, s); |
479 | if (!o || r < 0) | |
480 | log_error("Cannot attach session %s to seat %s", s->id, seat); | |
a185c5aa LP |
481 | } |
482 | ||
c506027a DH |
483 | if (!s->seat || !seat_has_vts(s->seat)) |
484 | s->vtnr = 0; | |
a185c5aa | 485 | |
e6494a07 | 486 | if (position && s->seat) { |
14cb109d | 487 | unsigned npos; |
49e6fdbf | 488 | |
e6494a07 | 489 | safe_atou(position, &npos); |
49e6fdbf DH |
490 | seat_claim_position(s->seat, s, npos); |
491 | } | |
492 | ||
3d0ef5c7 LP |
493 | if (tty_validity) { |
494 | TTYValidity v; | |
495 | ||
496 | v = tty_validity_from_string(tty_validity); | |
497 | if (v < 0) | |
498 | log_debug("Failed to parse TTY validity: %s", tty_validity); | |
499 | else | |
500 | s->tty_validity = v; | |
501 | } | |
502 | ||
a185c5aa | 503 | if (leader) { |
238794b1 LP |
504 | pid_t pid; |
505 | ||
506 | r = parse_pid(leader, &pid); | |
507 | if (r < 0) | |
508 | log_debug_errno(r, "Failed to parse leader PID of session: %s", leader); | |
509 | else { | |
510 | r = session_set_leader(s, pid); | |
511 | if (r < 0) | |
512 | log_warning_errno(r, "Failed to set session leader PID, ignoring: %m"); | |
513 | } | |
a185c5aa LP |
514 | } |
515 | ||
a91e4e53 LP |
516 | if (type) { |
517 | SessionType t; | |
518 | ||
519 | t = session_type_from_string(type); | |
520 | if (t >= 0) | |
521 | s->type = t; | |
522 | } | |
523 | ||
55efac6c LP |
524 | if (class) { |
525 | SessionClass c; | |
526 | ||
527 | c = session_class_from_string(class); | |
528 | if (c >= 0) | |
529 | s->class = c; | |
530 | } | |
531 | ||
be94d954 MP |
532 | if (state && streq(state, "closing")) |
533 | s->stopping = true; | |
534 | ||
b4f78aea LP |
535 | if (s->fifo_path) { |
536 | int fd; | |
537 | ||
538 | /* If we open an unopened pipe for reading we will not | |
539 | get an EOF. to trigger an EOF we hence open it for | |
be94d954 MP |
540 | writing, but close it right away which then will |
541 | trigger the EOF. This will happen immediately if no | |
542 | other process has the FIFO open for writing, i. e. | |
543 | when the session died before logind (re)started. */ | |
b4f78aea LP |
544 | |
545 | fd = session_create_fifo(s); | |
03e334a1 | 546 | safe_close(fd); |
b4f78aea LP |
547 | } |
548 | ||
b895a735 | 549 | if (realtime) |
d68c645b | 550 | (void) deserialize_usec(realtime, &s->timestamp.realtime); |
b895a735 | 551 | if (monotonic) |
d68c645b | 552 | (void) deserialize_usec(monotonic, &s->timestamp.monotonic); |
a185c5aa | 553 | |
aed24c4c FB |
554 | if (active) { |
555 | k = parse_boolean(active); | |
556 | if (k >= 0) | |
557 | s->was_active = k; | |
558 | } | |
559 | ||
1c8280fd LP |
560 | if (is_display) { |
561 | /* Note that when enumerating users are loaded before sessions, hence the display session to use is | |
562 | * something we have to store along with the session and not the user, as in that case we couldn't | |
563 | * apply it at the time we load the user. */ | |
564 | ||
565 | k = parse_boolean(is_display); | |
566 | if (k < 0) | |
567 | log_warning_errno(k, "Failed to parse IS_DISPLAY session property: %m"); | |
568 | else if (k > 0) | |
569 | s->user->display = s; | |
570 | } | |
571 | ||
6d33772f | 572 | if (controller) { |
aed24c4c | 573 | if (bus_name_has_owner(s->manager->bus, controller, NULL) > 0) { |
dc6284e9 | 574 | session_set_controller(s, controller, false, false); |
aed24c4c FB |
575 | session_load_devices(s, devices); |
576 | } else | |
90a18413 | 577 | session_restore_vt(s); |
6d33772f DH |
578 | } |
579 | ||
a185c5aa | 580 | return r; |
20263082 LP |
581 | } |
582 | ||
583 | int session_activate(Session *s) { | |
14cb109d | 584 | unsigned num_pending; |
d7bd01b5 | 585 | |
20263082 | 586 | assert(s); |
9444b1f2 | 587 | assert(s->user); |
20263082 | 588 | |
20263082 | 589 | if (!s->seat) |
15411c0c | 590 | return -EOPNOTSUPP; |
20263082 LP |
591 | |
592 | if (s->seat->active == s) | |
593 | return 0; | |
594 | ||
d7bd01b5 DH |
595 | /* on seats with VTs, we let VTs manage session-switching */ |
596 | if (seat_has_vts(s->seat)) { | |
709d0587 | 597 | if (s->vtnr == 0) |
15411c0c | 598 | return -EOPNOTSUPP; |
d7bd01b5 DH |
599 | |
600 | return chvt(s->vtnr); | |
601 | } | |
602 | ||
603 | /* On seats without VTs, we implement session-switching in logind. We | |
604 | * try to pause all session-devices and wait until the session | |
605 | * controller acknowledged them. Once all devices are asleep, we simply | |
606 | * switch the active session and be done. | |
607 | * We save the session we want to switch to in seat->pending_switch and | |
608 | * seat_complete_switch() will perform the final switch. */ | |
609 | ||
610 | s->seat->pending_switch = s; | |
611 | ||
612 | /* if no devices are running, immediately perform the session switch */ | |
613 | num_pending = session_device_try_pause_all(s); | |
614 | if (!num_pending) | |
615 | seat_complete_switch(s->seat); | |
20263082 | 616 | |
d7bd01b5 | 617 | return 0; |
20263082 LP |
618 | } |
619 | ||
25a1ab4e | 620 | static int session_start_scope(Session *s, sd_bus_message *properties, sd_bus_error *error) { |
98a28fef LP |
621 | int r; |
622 | ||
623 | assert(s); | |
9444b1f2 | 624 | assert(s->user); |
98a28fef | 625 | |
fb6becb4 | 626 | if (!s->scope) { |
fb2367ed | 627 | _cleanup_free_ char *scope = NULL; |
90558f31 | 628 | const char *description; |
405e0255 | 629 | |
25a1ab4e LP |
630 | s->scope_job = mfree(s->scope_job); |
631 | ||
605405c6 | 632 | scope = strjoin("session-", s->id, ".scope"); |
d0af76e6 | 633 | if (!scope) |
ae018d9b LP |
634 | return log_oom(); |
635 | ||
81d62103 | 636 | description = strjoina("Session ", s->id, " of user ", s->user->name); |
90558f31 LP |
637 | |
638 | r = manager_start_scope( | |
639 | s->manager, | |
640 | scope, | |
641 | s->leader, | |
642 | s->user->slice, | |
643 | description, | |
25a1ab4e LP |
644 | STRV_MAKE(s->user->runtime_dir_service, s->user->service), /* These two have StopWhenUnneeded= set, hence add a dep towards them */ |
645 | STRV_MAKE("systemd-logind.service", "systemd-user-sessions.service", s->user->runtime_dir_service, s->user->service), /* And order us after some more */ | |
d5ac9d06 | 646 | s->user->home, |
22f93314 | 647 | properties, |
25a1ab4e LP |
648 | error, |
649 | &s->scope_job); | |
fb2367ed | 650 | if (r < 0) |
25a1ab4e | 651 | return log_error_errno(r, "Failed to start session scope %s: %s", scope, bus_error_message(error, r)); |
fb2367ed YW |
652 | |
653 | s->scope = TAKE_PTR(scope); | |
20263082 LP |
654 | } |
655 | ||
d0af76e6 | 656 | if (s->scope) |
90558f31 | 657 | (void) hashmap_put(s->manager->session_units, s->scope, s); |
d0af76e6 | 658 | |
20263082 LP |
659 | return 0; |
660 | } | |
661 | ||
25a1ab4e | 662 | int session_start(Session *s, sd_bus_message *properties, sd_bus_error *error) { |
20263082 LP |
663 | int r; |
664 | ||
665 | assert(s); | |
9444b1f2 LP |
666 | |
667 | if (!s->user) | |
668 | return -ESTALE; | |
20263082 | 669 | |
25a1ab4e LP |
670 | if (s->stopping) |
671 | return -EINVAL; | |
672 | ||
9418f147 LP |
673 | if (s->started) |
674 | return 0; | |
675 | ||
ed18b08b LP |
676 | r = user_start(s->user); |
677 | if (r < 0) | |
678 | return r; | |
679 | ||
25a1ab4e | 680 | r = session_start_scope(s, properties, error); |
fb6becb4 LP |
681 | if (r < 0) |
682 | return r; | |
683 | ||
d9eb81f9 | 684 | log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO, |
2b044526 | 685 | "MESSAGE_ID=" SD_MESSAGE_SESSION_START_STR, |
877d54e9 LP |
686 | "SESSION_ID=%s", s->id, |
687 | "USER_ID=%s", s->user->name, | |
de0671ee | 688 | "LEADER="PID_FMT, s->leader, |
a1230ff9 | 689 | LOG_MESSAGE("New session %s of user %s.", s->id, s->user->name)); |
98a28fef | 690 | |
9444b1f2 LP |
691 | if (!dual_timestamp_is_set(&s->timestamp)) |
692 | dual_timestamp_get(&s->timestamp); | |
14c3baca | 693 | |
e9816c48 LP |
694 | if (s->seat) |
695 | seat_read_active_vt(s->seat); | |
696 | ||
9418f147 LP |
697 | s->started = true; |
698 | ||
952d3260 LP |
699 | user_elect_display(s->user); |
700 | ||
5f41d1f1 | 701 | /* Save data */ |
e9816c48 | 702 | session_save(s); |
7f7bb946 | 703 | user_save(s->user); |
5f41d1f1 LP |
704 | if (s->seat) |
705 | seat_save(s->seat); | |
e9816c48 | 706 | |
5f41d1f1 | 707 | /* Send signals */ |
da119395 | 708 | session_send_signal(s, true); |
7d049e30 | 709 | user_send_changed(s->user, "Display", NULL); |
9418f147 LP |
710 | if (s->seat) { |
711 | if (s->seat->active == s) | |
7d049e30 | 712 | seat_send_changed(s->seat, "ActiveSession", NULL); |
9418f147 LP |
713 | } |
714 | ||
20263082 LP |
715 | return 0; |
716 | } | |
717 | ||
9bb69af4 | 718 | static int session_stop_scope(Session *s, bool force) { |
4afd3348 | 719 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; |
20263082 | 720 | int r; |
20263082 LP |
721 | |
722 | assert(s); | |
723 | ||
fb6becb4 LP |
724 | if (!s->scope) |
725 | return 0; | |
9b221b63 | 726 | |
756ed0e2 | 727 | /* Let's always abandon the scope first. This tells systemd that we are not interested anymore, and everything |
629ff674 | 728 | * that is left in the scope is "left-over". Informing systemd about this has the benefit that it will log |
756ed0e2 LP |
729 | * when killing any processes left after this point. */ |
730 | r = manager_abandon_scope(s->manager, s->scope, &error); | |
25a1ab4e | 731 | if (r < 0) { |
756ed0e2 | 732 | log_warning_errno(r, "Failed to abandon session scope, ignoring: %s", bus_error_message(&error, r)); |
25a1ab4e LP |
733 | sd_bus_error_free(&error); |
734 | } | |
735 | ||
736 | s->scope_job = mfree(s->scope_job); | |
756ed0e2 LP |
737 | |
738 | /* Optionally, let's kill everything that's left now. */ | |
9bb69af4 | 739 | if (force || manager_shall_kill(s->manager, s->user->name)) { |
801a884d | 740 | |
25a1ab4e LP |
741 | r = manager_stop_unit(s->manager, s->scope, &error, &s->scope_job); |
742 | if (r < 0) { | |
743 | if (force) | |
744 | return log_error_errno(r, "Failed to stop session scope: %s", bus_error_message(&error, r)); | |
20263082 | 745 | |
25a1ab4e LP |
746 | log_warning_errno(r, "Failed to stop session scope, ignoring: %s", bus_error_message(&error, r)); |
747 | } | |
8150acb1 | 748 | } else { |
20263082 | 749 | |
8150acb1 AJ |
750 | /* With no killing, this session is allowed to persist in "closing" state indefinitely. |
751 | * Therefore session stop and session removal may be two distinct events. | |
752 | * Session stop is quite significant on its own, let's log it. */ | |
753 | log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO, | |
754 | "SESSION_ID=%s", s->id, | |
755 | "USER_ID=%s", s->user->name, | |
756 | "LEADER="PID_FMT, s->leader, | |
f4cf1d66 | 757 | LOG_MESSAGE("Session %s logged out. Waiting for processes to exit.", s->id)); |
8150acb1 AJ |
758 | } |
759 | ||
9b221b63 | 760 | return 0; |
20263082 LP |
761 | } |
762 | ||
9bb69af4 | 763 | int session_stop(Session *s, bool force) { |
405e0255 LP |
764 | int r; |
765 | ||
766 | assert(s); | |
767 | ||
25a1ab4e LP |
768 | /* This is called whenever we begin with tearing down a session record. It's called in four cases: explicit API |
769 | * request via the bus (either directly for the session object or for the seat or user object this session | |
770 | * belongs to; 'force' is true), or due to automatic GC (i.e. scope vanished; 'force' is false), or because the | |
771 | * session FIFO saw an EOF ('force' is false), or because the release timer hit ('force' is false). */ | |
772 | ||
405e0255 LP |
773 | if (!s->user) |
774 | return -ESTALE; | |
25a1ab4e LP |
775 | if (!s->started) |
776 | return 0; | |
777 | if (s->stopping) | |
778 | return 0; | |
405e0255 | 779 | |
5f41d1f1 LP |
780 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
781 | ||
10189fd6 DH |
782 | if (s->seat) |
783 | seat_evict_position(s->seat, s); | |
784 | ||
5f41d1f1 LP |
785 | /* We are going down, don't care about FIFOs anymore */ |
786 | session_remove_fifo(s); | |
787 | ||
405e0255 | 788 | /* Kill cgroup */ |
9bb69af4 | 789 | r = session_stop_scope(s, force); |
405e0255 | 790 | |
5f41d1f1 LP |
791 | s->stopping = true; |
792 | ||
952d3260 LP |
793 | user_elect_display(s->user); |
794 | ||
405e0255 | 795 | session_save(s); |
cc377381 | 796 | user_save(s->user); |
405e0255 LP |
797 | |
798 | return r; | |
799 | } | |
800 | ||
801 | int session_finalize(Session *s) { | |
118ecf32 | 802 | SessionDevice *sd; |
20263082 LP |
803 | |
804 | assert(s); | |
805 | ||
9444b1f2 LP |
806 | if (!s->user) |
807 | return -ESTALE; | |
808 | ||
ed18b08b | 809 | if (s->started) |
d9eb81f9 | 810 | log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO, |
2b044526 | 811 | "MESSAGE_ID=" SD_MESSAGE_SESSION_STOP_STR, |
877d54e9 LP |
812 | "SESSION_ID=%s", s->id, |
813 | "USER_ID=%s", s->user->name, | |
de0671ee | 814 | "LEADER="PID_FMT, s->leader, |
a1230ff9 | 815 | LOG_MESSAGE("Removed session %s.", s->id)); |
98a28fef | 816 | |
5f41d1f1 LP |
817 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
818 | ||
10189fd6 DH |
819 | if (s->seat) |
820 | seat_evict_position(s->seat, s); | |
821 | ||
118ecf32 DH |
822 | /* Kill session devices */ |
823 | while ((sd = hashmap_first(s->devices))) | |
824 | session_device_free(sd); | |
825 | ||
491ac9f2 | 826 | (void) unlink(s->state_file); |
d2f92cdf | 827 | session_add_to_gc_queue(s); |
ed18b08b | 828 | user_add_to_gc_queue(s->user); |
14c3baca | 829 | |
405e0255 | 830 | if (s->started) { |
ed18b08b | 831 | session_send_signal(s, false); |
405e0255 LP |
832 | s->started = false; |
833 | } | |
50fb9793 | 834 | |
9418f147 LP |
835 | if (s->seat) { |
836 | if (s->seat->active == s) | |
837 | seat_set_active(s->seat, NULL); | |
838 | ||
23bd3b62 | 839 | seat_save(s->seat); |
9418f147 LP |
840 | } |
841 | ||
23bd3b62 | 842 | user_save(s->user); |
7d049e30 | 843 | user_send_changed(s->user, "Display", NULL); |
9418f147 | 844 | |
491ac9f2 | 845 | return 0; |
20263082 LP |
846 | } |
847 | ||
5f41d1f1 LP |
848 | static int release_timeout_callback(sd_event_source *es, uint64_t usec, void *userdata) { |
849 | Session *s = userdata; | |
850 | ||
851 | assert(es); | |
852 | assert(s); | |
853 | ||
9bb69af4 | 854 | session_stop(s, false); |
5f41d1f1 LP |
855 | return 0; |
856 | } | |
857 | ||
ad8780c9 | 858 | int session_release(Session *s) { |
5f41d1f1 LP |
859 | assert(s); |
860 | ||
861 | if (!s->started || s->stopping) | |
ad8780c9 ZJS |
862 | return 0; |
863 | ||
864 | if (s->timer_event_source) | |
865 | return 0; | |
866 | ||
867 | return sd_event_add_time(s->manager->event, | |
868 | &s->timer_event_source, | |
869 | CLOCK_MONOTONIC, | |
061c6607 | 870 | usec_add(now(CLOCK_MONOTONIC), RELEASE_USEC), 0, |
ad8780c9 | 871 | release_timeout_callback, s); |
5f41d1f1 LP |
872 | } |
873 | ||
20263082 LP |
874 | bool session_is_active(Session *s) { |
875 | assert(s); | |
876 | ||
877 | if (!s->seat) | |
878 | return true; | |
879 | ||
880 | return s->seat->active == s; | |
881 | } | |
882 | ||
23406ce5 LP |
883 | static int get_tty_atime(const char *tty, usec_t *atime) { |
884 | _cleanup_free_ char *p = NULL; | |
a185c5aa | 885 | struct stat st; |
23406ce5 LP |
886 | |
887 | assert(tty); | |
888 | assert(atime); | |
889 | ||
890 | if (!path_is_absolute(tty)) { | |
891 | p = strappend("/dev/", tty); | |
892 | if (!p) | |
893 | return -ENOMEM; | |
894 | ||
895 | tty = p; | |
896 | } else if (!path_startswith(tty, "/dev/")) | |
897 | return -ENOENT; | |
898 | ||
899 | if (lstat(tty, &st) < 0) | |
900 | return -errno; | |
901 | ||
902 | *atime = timespec_load(&st.st_atim); | |
903 | return 0; | |
904 | } | |
905 | ||
906 | static int get_process_ctty_atime(pid_t pid, usec_t *atime) { | |
907 | _cleanup_free_ char *p = NULL; | |
908 | int r; | |
909 | ||
910 | assert(pid > 0); | |
911 | assert(atime); | |
912 | ||
913 | r = get_ctty(pid, NULL, &p); | |
914 | if (r < 0) | |
915 | return r; | |
916 | ||
917 | return get_tty_atime(p, atime); | |
918 | } | |
919 | ||
920 | int session_get_idle_hint(Session *s, dual_timestamp *t) { | |
23406ce5 LP |
921 | usec_t atime = 0, n; |
922 | int r; | |
a185c5aa LP |
923 | |
924 | assert(s); | |
925 | ||
23406ce5 | 926 | /* Explicit idle hint is set */ |
a185c5aa LP |
927 | if (s->idle_hint) { |
928 | if (t) | |
929 | *t = s->idle_hint_timestamp; | |
930 | ||
931 | return s->idle_hint; | |
932 | } | |
933 | ||
0762eaa3 | 934 | /* Graphical sessions should really implement a real |
23406ce5 | 935 | * idle hint logic */ |
129baf1b | 936 | if (SESSION_TYPE_IS_GRAPHICAL(s->type)) |
a185c5aa LP |
937 | goto dont_know; |
938 | ||
23406ce5 LP |
939 | /* For sessions with an explicitly configured tty, let's check |
940 | * its atime */ | |
941 | if (s->tty) { | |
942 | r = get_tty_atime(s->tty, &atime); | |
943 | if (r >= 0) | |
944 | goto found_atime; | |
945 | } | |
a185c5aa | 946 | |
23406ce5 LP |
947 | /* For sessions with a leader but no explicitly configured |
948 | * tty, let's check the controlling tty of the leader */ | |
238794b1 | 949 | if (pid_is_valid(s->leader)) { |
23406ce5 LP |
950 | r = get_process_ctty_atime(s->leader, &atime); |
951 | if (r >= 0) | |
952 | goto found_atime; | |
a185c5aa LP |
953 | } |
954 | ||
a185c5aa LP |
955 | dont_know: |
956 | if (t) | |
957 | *t = s->idle_hint_timestamp; | |
958 | ||
959 | return 0; | |
23406ce5 LP |
960 | |
961 | found_atime: | |
962 | if (t) | |
963 | dual_timestamp_from_realtime(t, atime); | |
964 | ||
965 | n = now(CLOCK_REALTIME); | |
966 | ||
967 | if (s->manager->idle_action_usec <= 0) | |
968 | return 0; | |
969 | ||
970 | return atime + s->manager->idle_action_usec <= n; | |
a185c5aa LP |
971 | } |
972 | ||
bef422ae LP |
973 | void session_set_idle_hint(Session *s, bool b) { |
974 | assert(s); | |
975 | ||
976 | if (s->idle_hint == b) | |
977 | return; | |
978 | ||
979 | s->idle_hint = b; | |
980 | dual_timestamp_get(&s->idle_hint_timestamp); | |
9418f147 | 981 | |
cc377381 | 982 | session_send_changed(s, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); |
9418f147 LP |
983 | |
984 | if (s->seat) | |
cc377381 LP |
985 | seat_send_changed(s->seat, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); |
986 | ||
987 | user_send_changed(s->user, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); | |
988 | manager_send_changed(s->manager, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); | |
989 | } | |
990 | ||
42d35e13 VT |
991 | int session_get_locked_hint(Session *s) { |
992 | assert(s); | |
993 | ||
994 | return s->locked_hint; | |
995 | } | |
996 | ||
997 | void session_set_locked_hint(Session *s, bool b) { | |
998 | assert(s); | |
999 | ||
1000 | if (s->locked_hint == b) | |
1001 | return; | |
1002 | ||
1003 | s->locked_hint = b; | |
1004 | ||
1005 | session_send_changed(s, "LockedHint", NULL); | |
1006 | } | |
1007 | ||
cc377381 LP |
1008 | static int session_dispatch_fifo(sd_event_source *es, int fd, uint32_t revents, void *userdata) { |
1009 | Session *s = userdata; | |
1010 | ||
1011 | assert(s); | |
1012 | assert(s->fifo_fd == fd); | |
1013 | ||
1014 | /* EOF on the FIFO means the session died abnormally. */ | |
1015 | ||
1016 | session_remove_fifo(s); | |
9bb69af4 | 1017 | session_stop(s, false); |
cc377381 LP |
1018 | |
1019 | return 1; | |
bef422ae LP |
1020 | } |
1021 | ||
932e3ee7 LP |
1022 | int session_create_fifo(Session *s) { |
1023 | int r; | |
1024 | ||
31b79c2b LP |
1025 | assert(s); |
1026 | ||
b4f78aea | 1027 | /* Create FIFO */ |
932e3ee7 | 1028 | if (!s->fifo_path) { |
37c1d5e9 | 1029 | r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0, MKDIR_WARN_MODE); |
e6061ab2 LP |
1030 | if (r < 0) |
1031 | return r; | |
1032 | ||
d5ddc930 LP |
1033 | s->fifo_path = strjoin("/run/systemd/sessions/", s->id, ".ref"); |
1034 | if (!s->fifo_path) | |
932e3ee7 | 1035 | return -ENOMEM; |
31b79c2b | 1036 | |
932e3ee7 LP |
1037 | if (mkfifo(s->fifo_path, 0600) < 0 && errno != EEXIST) |
1038 | return -errno; | |
1039 | } | |
31b79c2b | 1040 | |
932e3ee7 | 1041 | /* Open reading side */ |
b4f78aea | 1042 | if (s->fifo_fd < 0) { |
db4a47e9 | 1043 | s->fifo_fd = open(s->fifo_path, O_RDONLY|O_CLOEXEC|O_NONBLOCK); |
b4f78aea LP |
1044 | if (s->fifo_fd < 0) |
1045 | return -errno; | |
cc377381 LP |
1046 | } |
1047 | ||
1048 | if (!s->fifo_event_source) { | |
151b9b96 | 1049 | r = sd_event_add_io(s->manager->event, &s->fifo_event_source, s->fifo_fd, 0, session_dispatch_fifo, s); |
b4f78aea LP |
1050 | if (r < 0) |
1051 | return r; | |
1052 | ||
e11544a8 LP |
1053 | /* Let's make sure we noticed dead sessions before we process new bus requests (which might create new |
1054 | * sessions). */ | |
1055 | r = sd_event_source_set_priority(s->fifo_event_source, SD_EVENT_PRIORITY_NORMAL-10); | |
cc377381 LP |
1056 | if (r < 0) |
1057 | return r; | |
b4f78aea | 1058 | } |
932e3ee7 LP |
1059 | |
1060 | /* Open writing side */ | |
db4a47e9 | 1061 | r = open(s->fifo_path, O_WRONLY|O_CLOEXEC|O_NONBLOCK); |
932e3ee7 LP |
1062 | if (r < 0) |
1063 | return -errno; | |
31b79c2b | 1064 | |
932e3ee7 LP |
1065 | return r; |
1066 | } | |
1067 | ||
5f41d1f1 | 1068 | static void session_remove_fifo(Session *s) { |
932e3ee7 LP |
1069 | assert(s); |
1070 | ||
03e334a1 LP |
1071 | s->fifo_event_source = sd_event_source_unref(s->fifo_event_source); |
1072 | s->fifo_fd = safe_close(s->fifo_fd); | |
932e3ee7 LP |
1073 | |
1074 | if (s->fifo_path) { | |
75bbdf47 | 1075 | (void) unlink(s->fifo_path); |
a1e58e8e | 1076 | s->fifo_path = mfree(s->fifo_path); |
932e3ee7 | 1077 | } |
31b79c2b LP |
1078 | } |
1079 | ||
5c093a23 | 1080 | bool session_may_gc(Session *s, bool drop_not_started) { |
bd26aee1 LP |
1081 | int r; |
1082 | ||
20263082 LP |
1083 | assert(s); |
1084 | ||
4a4b033f | 1085 | if (drop_not_started && !s->started) |
5c093a23 | 1086 | return true; |
932e3ee7 | 1087 | |
9444b1f2 | 1088 | if (!s->user) |
5c093a23 | 1089 | return true; |
9444b1f2 | 1090 | |
932e3ee7 | 1091 | if (s->fifo_fd >= 0) { |
5f41d1f1 | 1092 | if (pipe_eof(s->fifo_fd) <= 0) |
5c093a23 | 1093 | return false; |
20263082 LP |
1094 | } |
1095 | ||
bd26aee1 LP |
1096 | if (s->scope_job) { |
1097 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; | |
1098 | ||
1099 | r = manager_job_is_active(s->manager, s->scope_job, &error); | |
1100 | if (r < 0) | |
1101 | log_debug_errno(r, "Failed to determine whether job '%s' is pending, ignoring: %s", s->scope_job, bus_error_message(&error, r)); | |
1102 | if (r != 0) | |
1103 | return false; | |
1104 | } | |
20263082 | 1105 | |
bd26aee1 LP |
1106 | if (s->scope) { |
1107 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; | |
1108 | ||
1109 | r = manager_unit_is_active(s->manager, s->scope, &error); | |
1110 | if (r < 0) | |
1111 | log_debug_errno(r, "Failed to determine whether unit '%s' is active, ignoring: %s", s->scope, bus_error_message(&error, r)); | |
1112 | if (r != 0) | |
1113 | return false; | |
1114 | } | |
20263082 | 1115 | |
5c093a23 | 1116 | return true; |
20263082 LP |
1117 | } |
1118 | ||
14c3baca LP |
1119 | void session_add_to_gc_queue(Session *s) { |
1120 | assert(s); | |
1121 | ||
1122 | if (s->in_gc_queue) | |
1123 | return; | |
1124 | ||
71fda00f | 1125 | LIST_PREPEND(gc_queue, s->manager->session_gc_queue, s); |
14c3baca LP |
1126 | s->in_gc_queue = true; |
1127 | } | |
1128 | ||
0604381b LP |
1129 | SessionState session_get_state(Session *s) { |
1130 | assert(s); | |
1131 | ||
8fe63cd4 | 1132 | /* always check closing first */ |
5f41d1f1 LP |
1133 | if (s->stopping || s->timer_event_source) |
1134 | return SESSION_CLOSING; | |
1135 | ||
8fe63cd4 | 1136 | if (s->scope_job || s->fifo_fd < 0) |
405e0255 | 1137 | return SESSION_OPENING; |
fb6becb4 | 1138 | |
0604381b LP |
1139 | if (session_is_active(s)) |
1140 | return SESSION_ACTIVE; | |
1141 | ||
1142 | return SESSION_ONLINE; | |
1143 | } | |
1144 | ||
de07ab16 | 1145 | int session_kill(Session *s, KillWho who, int signo) { |
de07ab16 LP |
1146 | assert(s); |
1147 | ||
fb6becb4 | 1148 | if (!s->scope) |
de07ab16 LP |
1149 | return -ESRCH; |
1150 | ||
fb6becb4 | 1151 | return manager_kill_unit(s->manager, s->scope, who, signo, NULL); |
de07ab16 LP |
1152 | } |
1153 | ||
90a18413 | 1154 | static int session_open_vt(Session *s) { |
5f41d1f1 | 1155 | char path[sizeof("/dev/tty") + DECIMAL_STR_MAX(s->vtnr)]; |
90a18413 | 1156 | |
baccf3e4 OB |
1157 | if (s->vtnr < 1) |
1158 | return -ENODEV; | |
90a18413 DH |
1159 | |
1160 | if (s->vtfd >= 0) | |
1161 | return s->vtfd; | |
1162 | ||
92bd5ff3 | 1163 | sprintf(path, "/dev/tty%u", s->vtnr); |
22356953 | 1164 | s->vtfd = open_terminal(path, O_RDWR | O_CLOEXEC | O_NONBLOCK | O_NOCTTY); |
4a62c710 | 1165 | if (s->vtfd < 0) |
709f6e46 | 1166 | return log_error_errno(s->vtfd, "cannot open VT %s of session %s: %m", path, s->id); |
90a18413 DH |
1167 | |
1168 | return s->vtfd; | |
1169 | } | |
1170 | ||
baccf3e4 | 1171 | int session_prepare_vt(Session *s) { |
90a18413 DH |
1172 | int vt, r; |
1173 | struct vt_mode mode = { 0 }; | |
90a18413 | 1174 | |
baccf3e4 OB |
1175 | if (s->vtnr < 1) |
1176 | return 0; | |
1177 | ||
90a18413 DH |
1178 | vt = session_open_vt(s); |
1179 | if (vt < 0) | |
baccf3e4 | 1180 | return vt; |
90a18413 | 1181 | |
d6176c6c | 1182 | r = fchown(vt, s->user->uid, -1); |
baccf3e4 | 1183 | if (r < 0) { |
94c156cd LP |
1184 | r = log_error_errno(errno, |
1185 | "Cannot change owner of /dev/tty%u: %m", | |
1186 | s->vtnr); | |
d6176c6c | 1187 | goto error; |
baccf3e4 | 1188 | } |
d6176c6c | 1189 | |
90a18413 | 1190 | r = ioctl(vt, KDSKBMODE, K_OFF); |
baccf3e4 | 1191 | if (r < 0) { |
94c156cd LP |
1192 | r = log_error_errno(errno, |
1193 | "Cannot set K_OFF on /dev/tty%u: %m", | |
1194 | s->vtnr); | |
90a18413 | 1195 | goto error; |
baccf3e4 | 1196 | } |
90a18413 DH |
1197 | |
1198 | r = ioctl(vt, KDSETMODE, KD_GRAPHICS); | |
baccf3e4 | 1199 | if (r < 0) { |
94c156cd LP |
1200 | r = log_error_errno(errno, |
1201 | "Cannot set KD_GRAPHICS on /dev/tty%u: %m", | |
1202 | s->vtnr); | |
90a18413 | 1203 | goto error; |
baccf3e4 | 1204 | } |
90a18413 | 1205 | |
90a18413 DH |
1206 | /* Oh, thanks to the VT layer, VT_AUTO does not work with KD_GRAPHICS. |
1207 | * So we need a dummy handler here which just acknowledges *all* VT | |
1208 | * switch requests. */ | |
1209 | mode.mode = VT_PROCESS; | |
92683ad2 DH |
1210 | mode.relsig = SIGRTMIN; |
1211 | mode.acqsig = SIGRTMIN + 1; | |
90a18413 | 1212 | r = ioctl(vt, VT_SETMODE, &mode); |
baccf3e4 | 1213 | if (r < 0) { |
94c156cd LP |
1214 | r = log_error_errno(errno, |
1215 | "Cannot set VT_PROCESS on /dev/tty%u: %m", | |
1216 | s->vtnr); | |
90a18413 | 1217 | goto error; |
baccf3e4 | 1218 | } |
90a18413 | 1219 | |
baccf3e4 | 1220 | return 0; |
90a18413 DH |
1221 | |
1222 | error: | |
90a18413 | 1223 | session_restore_vt(s); |
baccf3e4 | 1224 | return r; |
90a18413 DH |
1225 | } |
1226 | ||
0212126c | 1227 | static void session_restore_vt(Session *s) { |
6179ede1 | 1228 | int r, vt, old_fd; |
90a18413 | 1229 | |
128df4cf OT |
1230 | /* We need to get a fresh handle to the virtual terminal, |
1231 | * since the old file-descriptor is potentially in a hung-up | |
1232 | * state after the controlling process exited; we do a | |
1233 | * little dance to avoid having the terminal be available | |
1234 | * for reuse before we've cleaned it up. | |
1235 | */ | |
c10d6bdb | 1236 | old_fd = TAKE_FD(s->vtfd); |
128df4cf | 1237 | |
90a18413 | 1238 | vt = session_open_vt(s); |
128df4cf OT |
1239 | safe_close(old_fd); |
1240 | ||
90a18413 DH |
1241 | if (vt < 0) |
1242 | return; | |
1243 | ||
6179ede1 FB |
1244 | r = vt_restore(vt); |
1245 | if (r < 0) | |
1246 | log_warning_errno(r, "Failed to restore VT, ignoring: %m"); | |
d6176c6c | 1247 | |
03e334a1 | 1248 | s->vtfd = safe_close(s->vtfd); |
90a18413 DH |
1249 | } |
1250 | ||
2ec3ff66 | 1251 | void session_leave_vt(Session *s) { |
ce540a24 DH |
1252 | int r; |
1253 | ||
2ec3ff66 DH |
1254 | assert(s); |
1255 | ||
1256 | /* This is called whenever we get a VT-switch signal from the kernel. | |
1257 | * We acknowledge all of them unconditionally. Note that session are | |
1258 | * free to overwrite those handlers and we only register them for | |
1259 | * sessions with controllers. Legacy sessions are not affected. | |
1260 | * However, if we switch from a non-legacy to a legacy session, we must | |
1261 | * make sure to pause all device before acknowledging the switch. We | |
1262 | * process the real switch only after we are notified via sysfs, so the | |
1263 | * legacy session might have already started using the devices. If we | |
1264 | * don't pause the devices before the switch, we might confuse the | |
1265 | * session we switch to. */ | |
1266 | ||
1267 | if (s->vtfd < 0) | |
1268 | return; | |
1269 | ||
1270 | session_device_pause_all(s); | |
ce540a24 DH |
1271 | r = ioctl(s->vtfd, VT_RELDISP, 1); |
1272 | if (r < 0) | |
56f64d95 | 1273 | log_debug_errno(errno, "Cannot release VT of session %s: %m", s->id); |
2ec3ff66 DH |
1274 | } |
1275 | ||
cc377381 | 1276 | bool session_is_controller(Session *s, const char *sender) { |
ae5e06bd DH |
1277 | assert(s); |
1278 | ||
1279 | return streq_ptr(s->controller, sender); | |
1280 | } | |
1281 | ||
b12e5615 DH |
1282 | static void session_release_controller(Session *s, bool notify) { |
1283 | _cleanup_free_ char *name = NULL; | |
6d33772f DH |
1284 | SessionDevice *sd; |
1285 | ||
b12e5615 DH |
1286 | if (!s->controller) |
1287 | return; | |
6d33772f | 1288 | |
b12e5615 | 1289 | name = s->controller; |
90a18413 | 1290 | |
b12e5615 DH |
1291 | /* By resetting the controller before releasing the devices, we won't |
1292 | * send notification signals. This avoids sending useless notifications | |
1293 | * if the controller is released on disconnects. */ | |
1294 | if (!notify) | |
1295 | s->controller = NULL; | |
6d33772f | 1296 | |
b12e5615 DH |
1297 | while ((sd = hashmap_first(s->devices))) |
1298 | session_device_free(sd); | |
1299 | ||
1300 | s->controller = NULL; | |
3cde9e8f DM |
1301 | s->track = sd_bus_track_unref(s->track); |
1302 | } | |
1303 | ||
1304 | static int on_bus_track(sd_bus_track *track, void *userdata) { | |
1305 | Session *s = userdata; | |
1306 | ||
1307 | assert(track); | |
1308 | assert(s); | |
1309 | ||
1310 | session_drop_controller(s); | |
1311 | ||
1312 | return 0; | |
6d33772f DH |
1313 | } |
1314 | ||
dc6284e9 | 1315 | int session_set_controller(Session *s, const char *sender, bool force, bool prepare) { |
b12e5615 | 1316 | _cleanup_free_ char *name = NULL; |
ae5e06bd DH |
1317 | int r; |
1318 | ||
1319 | assert(s); | |
1320 | assert(sender); | |
1321 | ||
1322 | if (session_is_controller(s, sender)) | |
1323 | return 0; | |
1324 | if (s->controller && !force) | |
1325 | return -EBUSY; | |
1326 | ||
b12e5615 DH |
1327 | name = strdup(sender); |
1328 | if (!name) | |
ae5e06bd DH |
1329 | return -ENOMEM; |
1330 | ||
3cde9e8f DM |
1331 | s->track = sd_bus_track_unref(s->track); |
1332 | r = sd_bus_track_new(s->manager->bus, &s->track, on_bus_track, s); | |
1333 | if (r < 0) | |
1334 | return r; | |
1335 | ||
1336 | r = sd_bus_track_add_name(s->track, name); | |
1337 | if (r < 0) | |
ae5e06bd | 1338 | return r; |
ae5e06bd | 1339 | |
90a18413 DH |
1340 | /* When setting a session controller, we forcibly mute the VT and set |
1341 | * it into graphics-mode. Applications can override that by changing | |
1342 | * VT state after calling TakeControl(). However, this serves as a good | |
1343 | * default and well-behaving controllers can now ignore VTs entirely. | |
1344 | * Note that we reset the VT on ReleaseControl() and if the controller | |
1345 | * exits. | |
1346 | * If logind crashes/restarts, we restore the controller during restart | |
dc6284e9 FB |
1347 | * (without preparing the VT since the controller has probably overridden |
1348 | * VT state by now) or reset the VT in case it crashed/exited, too. */ | |
1349 | if (prepare) { | |
1350 | r = session_prepare_vt(s); | |
1351 | if (r < 0) { | |
1352 | s->track = sd_bus_track_unref(s->track); | |
1353 | return r; | |
1354 | } | |
13f493dc | 1355 | } |
baccf3e4 | 1356 | |
b12e5615 | 1357 | session_release_controller(s, true); |
ae2a15bc | 1358 | s->controller = TAKE_PTR(name); |
b12e5615 | 1359 | session_save(s); |
90a18413 | 1360 | |
ae5e06bd DH |
1361 | return 0; |
1362 | } | |
1363 | ||
1364 | void session_drop_controller(Session *s) { | |
1365 | assert(s); | |
1366 | ||
1367 | if (!s->controller) | |
1368 | return; | |
1369 | ||
3cde9e8f | 1370 | s->track = sd_bus_track_unref(s->track); |
b12e5615 DH |
1371 | session_release_controller(s, false); |
1372 | session_save(s); | |
1373 | session_restore_vt(s); | |
ae5e06bd DH |
1374 | } |
1375 | ||
fb6becb4 LP |
1376 | static const char* const session_state_table[_SESSION_STATE_MAX] = { |
1377 | [SESSION_OPENING] = "opening", | |
0604381b LP |
1378 | [SESSION_ONLINE] = "online", |
1379 | [SESSION_ACTIVE] = "active", | |
1380 | [SESSION_CLOSING] = "closing" | |
1381 | }; | |
1382 | ||
1383 | DEFINE_STRING_TABLE_LOOKUP(session_state, SessionState); | |
1384 | ||
20263082 | 1385 | static const char* const session_type_table[_SESSION_TYPE_MAX] = { |
2c5859af | 1386 | [SESSION_UNSPECIFIED] = "unspecified", |
3f49d45a | 1387 | [SESSION_TTY] = "tty", |
98a28fef | 1388 | [SESSION_X11] = "x11", |
d9eb81f9 | 1389 | [SESSION_WAYLAND] = "wayland", |
9541666b | 1390 | [SESSION_MIR] = "mir", |
e9e74f28 | 1391 | [SESSION_WEB] = "web", |
20263082 LP |
1392 | }; |
1393 | ||
1394 | DEFINE_STRING_TABLE_LOOKUP(session_type, SessionType); | |
de07ab16 | 1395 | |
55efac6c LP |
1396 | static const char* const session_class_table[_SESSION_CLASS_MAX] = { |
1397 | [SESSION_USER] = "user", | |
1398 | [SESSION_GREETER] = "greeter", | |
e2acb67b LP |
1399 | [SESSION_LOCK_SCREEN] = "lock-screen", |
1400 | [SESSION_BACKGROUND] = "background" | |
55efac6c LP |
1401 | }; |
1402 | ||
1403 | DEFINE_STRING_TABLE_LOOKUP(session_class, SessionClass); | |
1404 | ||
de07ab16 LP |
1405 | static const char* const kill_who_table[_KILL_WHO_MAX] = { |
1406 | [KILL_LEADER] = "leader", | |
1407 | [KILL_ALL] = "all" | |
1408 | }; | |
1409 | ||
1410 | DEFINE_STRING_TABLE_LOOKUP(kill_who, KillWho); | |
3d0ef5c7 LP |
1411 | |
1412 | static const char* const tty_validity_table[_TTY_VALIDITY_MAX] = { | |
1413 | [TTY_FROM_PAM] = "from-pam", | |
1414 | [TTY_FROM_UTMP] = "from-utmp", | |
1415 | [TTY_UTMP_INCONSISTENT] = "utmp-inconsistent", | |
1416 | }; | |
1417 | ||
1418 | DEFINE_STRING_TABLE_LOOKUP(tty_validity, TTYValidity); |