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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 | 18 | #include "bus-util.h" |
686d13b9 | 19 | #include "env-file.h" |
4f5dd394 | 20 | #include "escape.h" |
3ffd4af2 | 21 | #include "fd-util.h" |
4f5dd394 | 22 | #include "fileio.h" |
f97b34a6 | 23 | #include "format-util.h" |
c004493c | 24 | #include "io-util.h" |
3ffd4af2 | 25 | #include "logind-session.h" |
4f5dd394 | 26 | #include "mkdir.h" |
6bedfcbb | 27 | #include "parse-util.h" |
4f5dd394 | 28 | #include "path-util.h" |
8c29a457 | 29 | #include "process-util.h" |
d68c645b | 30 | #include "serialize.h" |
8b43440b | 31 | #include "string-table.h" |
25a1ab4e | 32 | #include "strv.h" |
288a74cc | 33 | #include "terminal-util.h" |
e4de7287 | 34 | #include "tmpfile-util.h" |
b1d4f8e1 | 35 | #include "user-util.h" |
4f5dd394 | 36 | #include "util.h" |
20263082 | 37 | |
5f41d1f1 LP |
38 | #define RELEASE_USEC (20*USEC_PER_SEC) |
39 | ||
40 | static void session_remove_fifo(Session *s); | |
0212126c | 41 | static void session_restore_vt(Session *s); |
5f41d1f1 | 42 | |
8c29a457 LP |
43 | int session_new(Session **ret, Manager *m, const char *id) { |
44 | _cleanup_(session_freep) Session *s = NULL; | |
45 | int r; | |
20263082 | 46 | |
8c29a457 | 47 | assert(ret); |
20263082 LP |
48 | assert(m); |
49 | assert(id); | |
50 | ||
8c29a457 LP |
51 | if (!session_id_valid(id)) |
52 | return -EINVAL; | |
53 | ||
54 | s = new(Session, 1); | |
20263082 | 55 | if (!s) |
8c29a457 LP |
56 | return -ENOMEM; |
57 | ||
58 | *s = (Session) { | |
59 | .manager = m, | |
60 | .fifo_fd = -1, | |
61 | .vtfd = -1, | |
62 | .audit_id = AUDIT_SESSION_INVALID, | |
3d0ef5c7 | 63 | .tty_validity = _TTY_VALIDITY_INVALID, |
8c29a457 | 64 | }; |
20263082 | 65 | |
98a28fef | 66 | s->state_file = strappend("/run/systemd/sessions/", id); |
6b430fdb | 67 | if (!s->state_file) |
8c29a457 | 68 | return -ENOMEM; |
118ecf32 | 69 | |
2b6bf07d | 70 | s->id = basename(s->state_file); |
20263082 | 71 | |
8c29a457 LP |
72 | s->devices = hashmap_new(&devt_hash_ops); |
73 | if (!s->devices) | |
74 | return -ENOMEM; | |
20263082 | 75 | |
8c29a457 LP |
76 | r = hashmap_put(m->sessions, s->id, s); |
77 | if (r < 0) | |
78 | return r; | |
20263082 | 79 | |
8c29a457 LP |
80 | *ret = TAKE_PTR(s); |
81 | return 0; | |
20263082 LP |
82 | } |
83 | ||
8c29a457 | 84 | Session* session_free(Session *s) { |
118ecf32 DH |
85 | SessionDevice *sd; |
86 | ||
8c29a457 LP |
87 | if (!s) |
88 | return NULL; | |
20263082 | 89 | |
14c3baca | 90 | if (s->in_gc_queue) |
71fda00f | 91 | LIST_REMOVE(gc_queue, s->manager->session_gc_queue, s); |
14c3baca | 92 | |
5f41d1f1 LP |
93 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
94 | ||
cc377381 LP |
95 | session_remove_fifo(s); |
96 | ||
ae5e06bd DH |
97 | session_drop_controller(s); |
98 | ||
118ecf32 DH |
99 | while ((sd = hashmap_first(s->devices))) |
100 | session_device_free(sd); | |
101 | ||
102 | hashmap_free(s->devices); | |
103 | ||
20263082 | 104 | if (s->user) { |
71fda00f | 105 | LIST_REMOVE(sessions_by_user, s->user->sessions, s); |
20263082 LP |
106 | |
107 | if (s->user->display == s) | |
108 | s->user->display = NULL; | |
9afe9efb LP |
109 | |
110 | user_update_last_session_timer(s->user); | |
20263082 LP |
111 | } |
112 | ||
9418f147 LP |
113 | if (s->seat) { |
114 | if (s->seat->active == s) | |
115 | s->seat->active = NULL; | |
d7bd01b5 DH |
116 | if (s->seat->pending_switch == s) |
117 | s->seat->pending_switch = NULL; | |
9418f147 | 118 | |
49e6fdbf | 119 | seat_evict_position(s->seat, s); |
71fda00f | 120 | LIST_REMOVE(sessions_by_seat, s->seat->sessions, s); |
9418f147 | 121 | } |
20263082 | 122 | |
fb6becb4 LP |
123 | if (s->scope) { |
124 | hashmap_remove(s->manager->session_units, s->scope); | |
125 | free(s->scope); | |
126 | } | |
127 | ||
238794b1 LP |
128 | if (pid_is_valid(s->leader)) |
129 | (void) hashmap_remove_value(s->manager->sessions_by_leader, PID_TO_PTR(s->leader), s); | |
130 | ||
fb6becb4 | 131 | free(s->scope_job); |
1713813d | 132 | |
cc377381 | 133 | sd_bus_message_unref(s->create_message); |
20263082 LP |
134 | |
135 | free(s->tty); | |
136 | free(s->display); | |
137 | free(s->remote_host); | |
3f49d45a | 138 | free(s->remote_user); |
98a28fef | 139 | free(s->service); |
a4cd87e9 | 140 | free(s->desktop); |
20263082 LP |
141 | |
142 | hashmap_remove(s->manager->sessions, s->id); | |
98a28fef | 143 | |
d2f92cdf | 144 | free(s->state_file); |
8c29a457 LP |
145 | |
146 | return mfree(s); | |
20263082 LP |
147 | } |
148 | ||
9444b1f2 LP |
149 | void session_set_user(Session *s, User *u) { |
150 | assert(s); | |
151 | assert(!s->user); | |
152 | ||
153 | s->user = u; | |
71fda00f | 154 | LIST_PREPEND(sessions_by_user, u->sessions, s); |
9afe9efb LP |
155 | |
156 | user_update_last_session_timer(u); | |
9444b1f2 LP |
157 | } |
158 | ||
238794b1 LP |
159 | int session_set_leader(Session *s, pid_t pid) { |
160 | int r; | |
161 | ||
162 | assert(s); | |
163 | ||
164 | if (!pid_is_valid(pid)) | |
165 | return -EINVAL; | |
166 | ||
167 | if (s->leader == pid) | |
168 | return 0; | |
169 | ||
170 | r = hashmap_put(s->manager->sessions_by_leader, PID_TO_PTR(pid), s); | |
171 | if (r < 0) | |
172 | return r; | |
173 | ||
174 | if (pid_is_valid(s->leader)) | |
175 | (void) hashmap_remove_value(s->manager->sessions_by_leader, PID_TO_PTR(s->leader), s); | |
176 | ||
177 | s->leader = pid; | |
178 | (void) audit_session_from_pid(pid, &s->audit_id); | |
179 | ||
180 | return 1; | |
181 | } | |
182 | ||
aed24c4c FB |
183 | static void session_save_devices(Session *s, FILE *f) { |
184 | SessionDevice *sd; | |
185 | Iterator i; | |
186 | ||
187 | if (!hashmap_isempty(s->devices)) { | |
188 | fprintf(f, "DEVICES="); | |
189 | HASHMAP_FOREACH(sd, s->devices, i) | |
190 | fprintf(f, "%u:%u ", major(sd->dev), minor(sd->dev)); | |
191 | fprintf(f, "\n"); | |
192 | } | |
193 | } | |
194 | ||
20263082 | 195 | int session_save(Session *s) { |
507f22bd | 196 | _cleanup_free_ char *temp_path = NULL; |
cc377381 | 197 | _cleanup_fclose_ FILE *f = NULL; |
20263082 LP |
198 | int r = 0; |
199 | ||
200 | assert(s); | |
201 | ||
9444b1f2 LP |
202 | if (!s->user) |
203 | return -ESTALE; | |
204 | ||
accaeded LP |
205 | if (!s->started) |
206 | return 0; | |
207 | ||
37c1d5e9 | 208 | r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0, MKDIR_WARN_MODE); |
20263082 | 209 | if (r < 0) |
dacd6cee | 210 | goto fail; |
20263082 | 211 | |
14c3baca LP |
212 | r = fopen_temporary(s->state_file, &f, &temp_path); |
213 | if (r < 0) | |
dacd6cee | 214 | goto fail; |
20263082 | 215 | |
44176400 LP |
216 | (void) __fsetlocking(f, FSETLOCKING_BYCALLER); |
217 | (void) fchmod(fileno(f), 0644); | |
14c3baca | 218 | |
20263082 LP |
219 | fprintf(f, |
220 | "# This is private data. Do not parse.\n" | |
90b2de37 | 221 | "UID="UID_FMT"\n" |
20263082 LP |
222 | "USER=%s\n" |
223 | "ACTIVE=%i\n" | |
1c8280fd | 224 | "IS_DISPLAY=%i\n" |
0604381b | 225 | "STATE=%s\n" |
fb6becb4 | 226 | "REMOTE=%i\n", |
90b2de37 | 227 | s->user->uid, |
20263082 LP |
228 | s->user->name, |
229 | session_is_active(s), | |
1c8280fd | 230 | s->user->display == s, |
0604381b | 231 | session_state_to_string(session_get_state(s)), |
fb6becb4 | 232 | s->remote); |
20263082 | 233 | |
a91e4e53 | 234 | if (s->type >= 0) |
507f22bd | 235 | fprintf(f, "TYPE=%s\n", session_type_to_string(s->type)); |
a91e4e53 | 236 | |
55efac6c | 237 | if (s->class >= 0) |
507f22bd | 238 | fprintf(f, "CLASS=%s\n", session_class_to_string(s->class)); |
55efac6c | 239 | |
fb6becb4 LP |
240 | if (s->scope) |
241 | fprintf(f, "SCOPE=%s\n", s->scope); | |
fb6becb4 LP |
242 | if (s->scope_job) |
243 | fprintf(f, "SCOPE_JOB=%s\n", s->scope_job); | |
20263082 | 244 | |
932e3ee7 | 245 | if (s->fifo_path) |
507f22bd | 246 | fprintf(f, "FIFO=%s\n", s->fifo_path); |
932e3ee7 | 247 | |
20263082 | 248 | if (s->seat) |
507f22bd | 249 | fprintf(f, "SEAT=%s\n", s->seat->id); |
20263082 LP |
250 | |
251 | if (s->tty) | |
507f22bd | 252 | fprintf(f, "TTY=%s\n", s->tty); |
20263082 | 253 | |
3d0ef5c7 LP |
254 | if (s->tty_validity >= 0) |
255 | fprintf(f, "TTY_VALIDITY=%s\n", tty_validity_to_string(s->tty_validity)); | |
256 | ||
20263082 | 257 | if (s->display) |
507f22bd | 258 | fprintf(f, "DISPLAY=%s\n", s->display); |
20263082 | 259 | |
558c6490 LP |
260 | if (s->remote_host) { |
261 | _cleanup_free_ char *escaped; | |
262 | ||
263 | escaped = cescape(s->remote_host); | |
264 | if (!escaped) { | |
265 | r = -ENOMEM; | |
dacd6cee | 266 | goto fail; |
558c6490 LP |
267 | } |
268 | ||
269 | fprintf(f, "REMOTE_HOST=%s\n", escaped); | |
270 | } | |
271 | ||
272 | if (s->remote_user) { | |
273 | _cleanup_free_ char *escaped; | |
274 | ||
275 | escaped = cescape(s->remote_user); | |
276 | if (!escaped) { | |
277 | r = -ENOMEM; | |
dacd6cee | 278 | goto fail; |
558c6490 LP |
279 | } |
280 | ||
281 | fprintf(f, "REMOTE_USER=%s\n", escaped); | |
282 | } | |
283 | ||
284 | if (s->service) { | |
285 | _cleanup_free_ char *escaped; | |
20263082 | 286 | |
558c6490 LP |
287 | escaped = cescape(s->service); |
288 | if (!escaped) { | |
289 | r = -ENOMEM; | |
dacd6cee | 290 | goto fail; |
558c6490 LP |
291 | } |
292 | ||
293 | fprintf(f, "SERVICE=%s\n", escaped); | |
294 | } | |
3f49d45a | 295 | |
558c6490 LP |
296 | if (s->desktop) { |
297 | _cleanup_free_ char *escaped; | |
98a28fef | 298 | |
558c6490 LP |
299 | escaped = cescape(s->desktop); |
300 | if (!escaped) { | |
301 | r = -ENOMEM; | |
dacd6cee | 302 | goto fail; |
558c6490 LP |
303 | } |
304 | ||
305 | fprintf(f, "DESKTOP=%s\n", escaped); | |
306 | } | |
a4cd87e9 | 307 | |
bf7825ae | 308 | if (s->seat && seat_has_vts(s->seat)) |
92bd5ff3 | 309 | fprintf(f, "VTNR=%u\n", s->vtnr); |
20263082 | 310 | |
49e6fdbf | 311 | if (!s->vtnr) |
e6494a07 | 312 | fprintf(f, "POSITION=%u\n", s->position); |
49e6fdbf | 313 | |
54191eb3 | 314 | if (pid_is_valid(s->leader)) |
90b2de37 | 315 | fprintf(f, "LEADER="PID_FMT"\n", s->leader); |
20263082 | 316 | |
3a87a86e | 317 | if (audit_session_is_valid(s->audit_id)) |
507f22bd | 318 | fprintf(f, "AUDIT=%"PRIu32"\n", s->audit_id); |
20263082 | 319 | |
9444b1f2 LP |
320 | if (dual_timestamp_is_set(&s->timestamp)) |
321 | fprintf(f, | |
90b2de37 ZJS |
322 | "REALTIME="USEC_FMT"\n" |
323 | "MONOTONIC="USEC_FMT"\n", | |
324 | s->timestamp.realtime, | |
325 | s->timestamp.monotonic); | |
9444b1f2 | 326 | |
aed24c4c | 327 | if (s->controller) { |
6d33772f | 328 | fprintf(f, "CONTROLLER=%s\n", s->controller); |
aed24c4c FB |
329 | session_save_devices(s, f); |
330 | } | |
6d33772f | 331 | |
dacd6cee LP |
332 | r = fflush_and_check(f); |
333 | if (r < 0) | |
334 | goto fail; | |
14c3baca | 335 | |
dacd6cee | 336 | if (rename(temp_path, s->state_file) < 0) { |
20263082 | 337 | r = -errno; |
dacd6cee | 338 | goto fail; |
20263082 LP |
339 | } |
340 | ||
dacd6cee LP |
341 | return 0; |
342 | ||
343 | fail: | |
344 | (void) unlink(s->state_file); | |
14c3baca | 345 | |
dacd6cee LP |
346 | if (temp_path) |
347 | (void) unlink(temp_path); | |
348 | ||
349 | return log_error_errno(r, "Failed to save session data %s: %m", s->state_file); | |
20263082 LP |
350 | } |
351 | ||
aed24c4c FB |
352 | static int session_load_devices(Session *s, const char *devices) { |
353 | const char *p; | |
354 | int r = 0; | |
355 | ||
356 | assert(s); | |
357 | ||
358 | for (p = devices;;) { | |
359 | _cleanup_free_ char *word = NULL; | |
360 | SessionDevice *sd; | |
361 | dev_t dev; | |
362 | int k; | |
363 | ||
364 | k = extract_first_word(&p, &word, NULL, 0); | |
365 | if (k == 0) | |
366 | break; | |
367 | if (k < 0) { | |
368 | r = k; | |
369 | break; | |
370 | } | |
371 | ||
372 | k = parse_dev(word, &dev); | |
373 | if (k < 0) { | |
374 | r = k; | |
375 | continue; | |
376 | } | |
377 | ||
378 | /* The file descriptors for loaded devices will be reattached later. */ | |
379 | k = session_device_new(s, dev, false, &sd); | |
380 | if (k < 0) | |
381 | r = k; | |
382 | } | |
383 | ||
384 | if (r < 0) | |
385 | log_error_errno(r, "Loading session devices for session %s failed: %m", s->id); | |
386 | ||
387 | return r; | |
388 | } | |
dacd6cee | 389 | |
20263082 | 390 | int session_load(Session *s) { |
9444b1f2 | 391 | _cleanup_free_ char *remote = NULL, |
a185c5aa | 392 | *seat = NULL, |
3d0ef5c7 | 393 | *tty_validity = NULL, |
a185c5aa | 394 | *vtnr = NULL, |
be94d954 | 395 | *state = NULL, |
e6494a07 | 396 | *position = NULL, |
a185c5aa | 397 | *leader = NULL, |
55efac6c | 398 | *type = NULL, |
9444b1f2 LP |
399 | *class = NULL, |
400 | *uid = NULL, | |
401 | *realtime = NULL, | |
6d33772f | 402 | *monotonic = NULL, |
aed24c4c FB |
403 | *controller = NULL, |
404 | *active = NULL, | |
1c8280fd LP |
405 | *devices = NULL, |
406 | *is_display = NULL; | |
a185c5aa LP |
407 | |
408 | int k, r; | |
409 | ||
20263082 LP |
410 | assert(s); |
411 | ||
aa8fbc74 | 412 | r = parse_env_file(NULL, s->state_file, |
a185c5aa | 413 | "REMOTE", &remote, |
fb6becb4 LP |
414 | "SCOPE", &s->scope, |
415 | "SCOPE_JOB", &s->scope_job, | |
932e3ee7 | 416 | "FIFO", &s->fifo_path, |
a185c5aa LP |
417 | "SEAT", &seat, |
418 | "TTY", &s->tty, | |
3d0ef5c7 | 419 | "TTY_VALIDITY", &tty_validity, |
a185c5aa LP |
420 | "DISPLAY", &s->display, |
421 | "REMOTE_HOST", &s->remote_host, | |
422 | "REMOTE_USER", &s->remote_user, | |
98a28fef | 423 | "SERVICE", &s->service, |
a4cd87e9 | 424 | "DESKTOP", &s->desktop, |
a185c5aa | 425 | "VTNR", &vtnr, |
be94d954 | 426 | "STATE", &state, |
e6494a07 | 427 | "POSITION", &position, |
a185c5aa | 428 | "LEADER", &leader, |
a91e4e53 | 429 | "TYPE", &type, |
55efac6c | 430 | "CLASS", &class, |
9444b1f2 LP |
431 | "UID", &uid, |
432 | "REALTIME", &realtime, | |
433 | "MONOTONIC", &monotonic, | |
6d33772f | 434 | "CONTROLLER", &controller, |
aed24c4c FB |
435 | "ACTIVE", &active, |
436 | "DEVICES", &devices, | |
13df9c39 | 437 | "IS_DISPLAY", &is_display); |
a185c5aa | 438 | |
f647962d MS |
439 | if (r < 0) |
440 | return log_error_errno(r, "Failed to read %s: %m", s->state_file); | |
9444b1f2 LP |
441 | |
442 | if (!s->user) { | |
443 | uid_t u; | |
444 | User *user; | |
445 | ||
baaa35ad ZJS |
446 | if (!uid) |
447 | return log_error_errno(SYNTHETIC_ERRNO(ENOENT), | |
448 | "UID not specified for session %s", | |
449 | s->id); | |
9444b1f2 LP |
450 | |
451 | r = parse_uid(uid, &u); | |
452 | if (r < 0) { | |
453 | log_error("Failed to parse UID value %s for session %s.", uid, s->id); | |
454 | return r; | |
455 | } | |
456 | ||
8cb4ab00 | 457 | user = hashmap_get(s->manager->users, UID_TO_PTR(u)); |
baaa35ad ZJS |
458 | if (!user) |
459 | return log_error_errno(SYNTHETIC_ERRNO(ENOENT), | |
460 | "User of session %s not known.", | |
461 | s->id); | |
9444b1f2 LP |
462 | |
463 | session_set_user(s, user); | |
464 | } | |
a185c5aa LP |
465 | |
466 | if (remote) { | |
467 | k = parse_boolean(remote); | |
468 | if (k >= 0) | |
469 | s->remote = k; | |
470 | } | |
471 | ||
c506027a DH |
472 | if (vtnr) |
473 | safe_atou(vtnr, &s->vtnr); | |
474 | ||
9418f147 | 475 | if (seat && !s->seat) { |
a185c5aa LP |
476 | Seat *o; |
477 | ||
478 | o = hashmap_get(s->manager->seats, seat); | |
479 | if (o) | |
c506027a DH |
480 | r = seat_attach_session(o, s); |
481 | if (!o || r < 0) | |
482 | log_error("Cannot attach session %s to seat %s", s->id, seat); | |
a185c5aa LP |
483 | } |
484 | ||
c506027a DH |
485 | if (!s->seat || !seat_has_vts(s->seat)) |
486 | s->vtnr = 0; | |
a185c5aa | 487 | |
e6494a07 | 488 | if (position && s->seat) { |
14cb109d | 489 | unsigned npos; |
49e6fdbf | 490 | |
e6494a07 | 491 | safe_atou(position, &npos); |
49e6fdbf DH |
492 | seat_claim_position(s->seat, s, npos); |
493 | } | |
494 | ||
3d0ef5c7 LP |
495 | if (tty_validity) { |
496 | TTYValidity v; | |
497 | ||
498 | v = tty_validity_from_string(tty_validity); | |
499 | if (v < 0) | |
500 | log_debug("Failed to parse TTY validity: %s", tty_validity); | |
501 | else | |
502 | s->tty_validity = v; | |
503 | } | |
504 | ||
a185c5aa | 505 | if (leader) { |
238794b1 LP |
506 | pid_t pid; |
507 | ||
508 | r = parse_pid(leader, &pid); | |
509 | if (r < 0) | |
510 | log_debug_errno(r, "Failed to parse leader PID of session: %s", leader); | |
511 | else { | |
512 | r = session_set_leader(s, pid); | |
513 | if (r < 0) | |
514 | log_warning_errno(r, "Failed to set session leader PID, ignoring: %m"); | |
515 | } | |
a185c5aa LP |
516 | } |
517 | ||
a91e4e53 LP |
518 | if (type) { |
519 | SessionType t; | |
520 | ||
521 | t = session_type_from_string(type); | |
522 | if (t >= 0) | |
523 | s->type = t; | |
524 | } | |
525 | ||
55efac6c LP |
526 | if (class) { |
527 | SessionClass c; | |
528 | ||
529 | c = session_class_from_string(class); | |
530 | if (c >= 0) | |
531 | s->class = c; | |
532 | } | |
533 | ||
be94d954 MP |
534 | if (state && streq(state, "closing")) |
535 | s->stopping = true; | |
536 | ||
b4f78aea LP |
537 | if (s->fifo_path) { |
538 | int fd; | |
539 | ||
540 | /* If we open an unopened pipe for reading we will not | |
541 | get an EOF. to trigger an EOF we hence open it for | |
be94d954 MP |
542 | writing, but close it right away which then will |
543 | trigger the EOF. This will happen immediately if no | |
544 | other process has the FIFO open for writing, i. e. | |
545 | when the session died before logind (re)started. */ | |
b4f78aea LP |
546 | |
547 | fd = session_create_fifo(s); | |
03e334a1 | 548 | safe_close(fd); |
b4f78aea LP |
549 | } |
550 | ||
b895a735 | 551 | if (realtime) |
d68c645b | 552 | (void) deserialize_usec(realtime, &s->timestamp.realtime); |
b895a735 | 553 | if (monotonic) |
d68c645b | 554 | (void) deserialize_usec(monotonic, &s->timestamp.monotonic); |
a185c5aa | 555 | |
aed24c4c FB |
556 | if (active) { |
557 | k = parse_boolean(active); | |
558 | if (k >= 0) | |
559 | s->was_active = k; | |
560 | } | |
561 | ||
1c8280fd LP |
562 | if (is_display) { |
563 | /* Note that when enumerating users are loaded before sessions, hence the display session to use is | |
564 | * something we have to store along with the session and not the user, as in that case we couldn't | |
565 | * apply it at the time we load the user. */ | |
566 | ||
567 | k = parse_boolean(is_display); | |
568 | if (k < 0) | |
569 | log_warning_errno(k, "Failed to parse IS_DISPLAY session property: %m"); | |
570 | else if (k > 0) | |
571 | s->user->display = s; | |
572 | } | |
573 | ||
6d33772f | 574 | if (controller) { |
aed24c4c | 575 | if (bus_name_has_owner(s->manager->bus, controller, NULL) > 0) { |
dc6284e9 | 576 | session_set_controller(s, controller, false, false); |
aed24c4c FB |
577 | session_load_devices(s, devices); |
578 | } else | |
90a18413 | 579 | session_restore_vt(s); |
6d33772f DH |
580 | } |
581 | ||
a185c5aa | 582 | return r; |
20263082 LP |
583 | } |
584 | ||
585 | int session_activate(Session *s) { | |
14cb109d | 586 | unsigned num_pending; |
d7bd01b5 | 587 | |
20263082 | 588 | assert(s); |
9444b1f2 | 589 | assert(s->user); |
20263082 | 590 | |
20263082 | 591 | if (!s->seat) |
15411c0c | 592 | return -EOPNOTSUPP; |
20263082 LP |
593 | |
594 | if (s->seat->active == s) | |
595 | return 0; | |
596 | ||
d7bd01b5 DH |
597 | /* on seats with VTs, we let VTs manage session-switching */ |
598 | if (seat_has_vts(s->seat)) { | |
709d0587 | 599 | if (s->vtnr == 0) |
15411c0c | 600 | return -EOPNOTSUPP; |
d7bd01b5 DH |
601 | |
602 | return chvt(s->vtnr); | |
603 | } | |
604 | ||
605 | /* On seats without VTs, we implement session-switching in logind. We | |
606 | * try to pause all session-devices and wait until the session | |
607 | * controller acknowledged them. Once all devices are asleep, we simply | |
608 | * switch the active session and be done. | |
609 | * We save the session we want to switch to in seat->pending_switch and | |
610 | * seat_complete_switch() will perform the final switch. */ | |
611 | ||
612 | s->seat->pending_switch = s; | |
613 | ||
614 | /* if no devices are running, immediately perform the session switch */ | |
615 | num_pending = session_device_try_pause_all(s); | |
616 | if (!num_pending) | |
617 | seat_complete_switch(s->seat); | |
20263082 | 618 | |
d7bd01b5 | 619 | return 0; |
20263082 LP |
620 | } |
621 | ||
25a1ab4e | 622 | static int session_start_scope(Session *s, sd_bus_message *properties, sd_bus_error *error) { |
98a28fef LP |
623 | int r; |
624 | ||
625 | assert(s); | |
9444b1f2 | 626 | assert(s->user); |
98a28fef | 627 | |
fb6becb4 | 628 | if (!s->scope) { |
fb2367ed | 629 | _cleanup_free_ char *scope = NULL; |
90558f31 | 630 | const char *description; |
405e0255 | 631 | |
25a1ab4e LP |
632 | s->scope_job = mfree(s->scope_job); |
633 | ||
605405c6 | 634 | scope = strjoin("session-", s->id, ".scope"); |
d0af76e6 | 635 | if (!scope) |
ae018d9b LP |
636 | return log_oom(); |
637 | ||
81d62103 | 638 | description = strjoina("Session ", s->id, " of user ", s->user->name); |
90558f31 LP |
639 | |
640 | r = manager_start_scope( | |
641 | s->manager, | |
642 | scope, | |
643 | s->leader, | |
644 | s->user->slice, | |
645 | description, | |
25a1ab4e LP |
646 | STRV_MAKE(s->user->runtime_dir_service, s->user->service), /* These two have StopWhenUnneeded= set, hence add a dep towards them */ |
647 | STRV_MAKE("systemd-logind.service", "systemd-user-sessions.service", s->user->runtime_dir_service, s->user->service), /* And order us after some more */ | |
d5ac9d06 | 648 | s->user->home, |
22f93314 | 649 | properties, |
25a1ab4e LP |
650 | error, |
651 | &s->scope_job); | |
fb2367ed | 652 | if (r < 0) |
25a1ab4e | 653 | return log_error_errno(r, "Failed to start session scope %s: %s", scope, bus_error_message(error, r)); |
fb2367ed YW |
654 | |
655 | s->scope = TAKE_PTR(scope); | |
20263082 LP |
656 | } |
657 | ||
d0af76e6 | 658 | if (s->scope) |
90558f31 | 659 | (void) hashmap_put(s->manager->session_units, s->scope, s); |
d0af76e6 | 660 | |
20263082 LP |
661 | return 0; |
662 | } | |
663 | ||
25a1ab4e | 664 | int session_start(Session *s, sd_bus_message *properties, sd_bus_error *error) { |
20263082 LP |
665 | int r; |
666 | ||
667 | assert(s); | |
9444b1f2 LP |
668 | |
669 | if (!s->user) | |
670 | return -ESTALE; | |
20263082 | 671 | |
25a1ab4e LP |
672 | if (s->stopping) |
673 | return -EINVAL; | |
674 | ||
9418f147 LP |
675 | if (s->started) |
676 | return 0; | |
677 | ||
ed18b08b LP |
678 | r = user_start(s->user); |
679 | if (r < 0) | |
680 | return r; | |
681 | ||
25a1ab4e | 682 | r = session_start_scope(s, properties, error); |
fb6becb4 LP |
683 | if (r < 0) |
684 | return r; | |
685 | ||
d9eb81f9 | 686 | log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO, |
2b044526 | 687 | "MESSAGE_ID=" SD_MESSAGE_SESSION_START_STR, |
877d54e9 LP |
688 | "SESSION_ID=%s", s->id, |
689 | "USER_ID=%s", s->user->name, | |
de0671ee | 690 | "LEADER="PID_FMT, s->leader, |
a1230ff9 | 691 | LOG_MESSAGE("New session %s of user %s.", s->id, s->user->name)); |
98a28fef | 692 | |
9444b1f2 LP |
693 | if (!dual_timestamp_is_set(&s->timestamp)) |
694 | dual_timestamp_get(&s->timestamp); | |
14c3baca | 695 | |
e9816c48 LP |
696 | if (s->seat) |
697 | seat_read_active_vt(s->seat); | |
698 | ||
9418f147 LP |
699 | s->started = true; |
700 | ||
952d3260 LP |
701 | user_elect_display(s->user); |
702 | ||
5f41d1f1 | 703 | /* Save data */ |
e9816c48 | 704 | session_save(s); |
7f7bb946 | 705 | user_save(s->user); |
5f41d1f1 LP |
706 | if (s->seat) |
707 | seat_save(s->seat); | |
e9816c48 | 708 | |
5f41d1f1 | 709 | /* Send signals */ |
da119395 | 710 | session_send_signal(s, true); |
7d049e30 | 711 | user_send_changed(s->user, "Display", NULL); |
9418f147 LP |
712 | if (s->seat) { |
713 | if (s->seat->active == s) | |
7d049e30 | 714 | seat_send_changed(s->seat, "ActiveSession", NULL); |
9418f147 LP |
715 | } |
716 | ||
20263082 LP |
717 | return 0; |
718 | } | |
719 | ||
9bb69af4 | 720 | static int session_stop_scope(Session *s, bool force) { |
4afd3348 | 721 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; |
20263082 | 722 | int r; |
20263082 LP |
723 | |
724 | assert(s); | |
725 | ||
fb6becb4 LP |
726 | if (!s->scope) |
727 | return 0; | |
9b221b63 | 728 | |
756ed0e2 | 729 | /* Let's always abandon the scope first. This tells systemd that we are not interested anymore, and everything |
629ff674 | 730 | * that is left in the scope is "left-over". Informing systemd about this has the benefit that it will log |
756ed0e2 LP |
731 | * when killing any processes left after this point. */ |
732 | r = manager_abandon_scope(s->manager, s->scope, &error); | |
25a1ab4e | 733 | if (r < 0) { |
756ed0e2 | 734 | log_warning_errno(r, "Failed to abandon session scope, ignoring: %s", bus_error_message(&error, r)); |
25a1ab4e LP |
735 | sd_bus_error_free(&error); |
736 | } | |
737 | ||
738 | s->scope_job = mfree(s->scope_job); | |
756ed0e2 LP |
739 | |
740 | /* Optionally, let's kill everything that's left now. */ | |
9bb69af4 | 741 | if (force || manager_shall_kill(s->manager, s->user->name)) { |
801a884d | 742 | |
25a1ab4e LP |
743 | r = manager_stop_unit(s->manager, s->scope, &error, &s->scope_job); |
744 | if (r < 0) { | |
745 | if (force) | |
746 | return log_error_errno(r, "Failed to stop session scope: %s", bus_error_message(&error, r)); | |
20263082 | 747 | |
25a1ab4e LP |
748 | log_warning_errno(r, "Failed to stop session scope, ignoring: %s", bus_error_message(&error, r)); |
749 | } | |
8150acb1 | 750 | } else { |
20263082 | 751 | |
8150acb1 AJ |
752 | /* With no killing, this session is allowed to persist in "closing" state indefinitely. |
753 | * Therefore session stop and session removal may be two distinct events. | |
754 | * Session stop is quite significant on its own, let's log it. */ | |
755 | log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO, | |
756 | "SESSION_ID=%s", s->id, | |
757 | "USER_ID=%s", s->user->name, | |
758 | "LEADER="PID_FMT, s->leader, | |
f4cf1d66 | 759 | LOG_MESSAGE("Session %s logged out. Waiting for processes to exit.", s->id)); |
8150acb1 AJ |
760 | } |
761 | ||
9b221b63 | 762 | return 0; |
20263082 LP |
763 | } |
764 | ||
9bb69af4 | 765 | int session_stop(Session *s, bool force) { |
405e0255 LP |
766 | int r; |
767 | ||
768 | assert(s); | |
769 | ||
25a1ab4e LP |
770 | /* This is called whenever we begin with tearing down a session record. It's called in four cases: explicit API |
771 | * request via the bus (either directly for the session object or for the seat or user object this session | |
772 | * belongs to; 'force' is true), or due to automatic GC (i.e. scope vanished; 'force' is false), or because the | |
773 | * session FIFO saw an EOF ('force' is false), or because the release timer hit ('force' is false). */ | |
774 | ||
405e0255 LP |
775 | if (!s->user) |
776 | return -ESTALE; | |
25a1ab4e LP |
777 | if (!s->started) |
778 | return 0; | |
779 | if (s->stopping) | |
780 | return 0; | |
405e0255 | 781 | |
5f41d1f1 LP |
782 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
783 | ||
10189fd6 DH |
784 | if (s->seat) |
785 | seat_evict_position(s->seat, s); | |
786 | ||
5f41d1f1 LP |
787 | /* We are going down, don't care about FIFOs anymore */ |
788 | session_remove_fifo(s); | |
789 | ||
405e0255 | 790 | /* Kill cgroup */ |
9bb69af4 | 791 | r = session_stop_scope(s, force); |
405e0255 | 792 | |
5f41d1f1 LP |
793 | s->stopping = true; |
794 | ||
952d3260 LP |
795 | user_elect_display(s->user); |
796 | ||
405e0255 | 797 | session_save(s); |
cc377381 | 798 | user_save(s->user); |
405e0255 LP |
799 | |
800 | return r; | |
801 | } | |
802 | ||
803 | int session_finalize(Session *s) { | |
118ecf32 | 804 | SessionDevice *sd; |
20263082 LP |
805 | |
806 | assert(s); | |
807 | ||
9444b1f2 LP |
808 | if (!s->user) |
809 | return -ESTALE; | |
810 | ||
ed18b08b | 811 | if (s->started) |
d9eb81f9 | 812 | log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO, |
2b044526 | 813 | "MESSAGE_ID=" SD_MESSAGE_SESSION_STOP_STR, |
877d54e9 LP |
814 | "SESSION_ID=%s", s->id, |
815 | "USER_ID=%s", s->user->name, | |
de0671ee | 816 | "LEADER="PID_FMT, s->leader, |
a1230ff9 | 817 | LOG_MESSAGE("Removed session %s.", s->id)); |
98a28fef | 818 | |
5f41d1f1 LP |
819 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
820 | ||
10189fd6 DH |
821 | if (s->seat) |
822 | seat_evict_position(s->seat, s); | |
823 | ||
118ecf32 DH |
824 | /* Kill session devices */ |
825 | while ((sd = hashmap_first(s->devices))) | |
826 | session_device_free(sd); | |
827 | ||
491ac9f2 | 828 | (void) unlink(s->state_file); |
d2f92cdf | 829 | session_add_to_gc_queue(s); |
ed18b08b | 830 | user_add_to_gc_queue(s->user); |
14c3baca | 831 | |
405e0255 | 832 | if (s->started) { |
ed18b08b | 833 | session_send_signal(s, false); |
405e0255 LP |
834 | s->started = false; |
835 | } | |
50fb9793 | 836 | |
9418f147 LP |
837 | if (s->seat) { |
838 | if (s->seat->active == s) | |
839 | seat_set_active(s->seat, NULL); | |
840 | ||
23bd3b62 | 841 | seat_save(s->seat); |
9418f147 LP |
842 | } |
843 | ||
23bd3b62 | 844 | user_save(s->user); |
7d049e30 | 845 | user_send_changed(s->user, "Display", NULL); |
9418f147 | 846 | |
491ac9f2 | 847 | return 0; |
20263082 LP |
848 | } |
849 | ||
5f41d1f1 LP |
850 | static int release_timeout_callback(sd_event_source *es, uint64_t usec, void *userdata) { |
851 | Session *s = userdata; | |
852 | ||
853 | assert(es); | |
854 | assert(s); | |
855 | ||
9bb69af4 | 856 | session_stop(s, false); |
5f41d1f1 LP |
857 | return 0; |
858 | } | |
859 | ||
ad8780c9 | 860 | int session_release(Session *s) { |
5f41d1f1 LP |
861 | assert(s); |
862 | ||
863 | if (!s->started || s->stopping) | |
ad8780c9 ZJS |
864 | return 0; |
865 | ||
866 | if (s->timer_event_source) | |
867 | return 0; | |
868 | ||
869 | return sd_event_add_time(s->manager->event, | |
870 | &s->timer_event_source, | |
871 | CLOCK_MONOTONIC, | |
061c6607 | 872 | usec_add(now(CLOCK_MONOTONIC), RELEASE_USEC), 0, |
ad8780c9 | 873 | release_timeout_callback, s); |
5f41d1f1 LP |
874 | } |
875 | ||
20263082 LP |
876 | bool session_is_active(Session *s) { |
877 | assert(s); | |
878 | ||
879 | if (!s->seat) | |
880 | return true; | |
881 | ||
882 | return s->seat->active == s; | |
883 | } | |
884 | ||
23406ce5 LP |
885 | static int get_tty_atime(const char *tty, usec_t *atime) { |
886 | _cleanup_free_ char *p = NULL; | |
a185c5aa | 887 | struct stat st; |
23406ce5 LP |
888 | |
889 | assert(tty); | |
890 | assert(atime); | |
891 | ||
892 | if (!path_is_absolute(tty)) { | |
893 | p = strappend("/dev/", tty); | |
894 | if (!p) | |
895 | return -ENOMEM; | |
896 | ||
897 | tty = p; | |
898 | } else if (!path_startswith(tty, "/dev/")) | |
899 | return -ENOENT; | |
900 | ||
901 | if (lstat(tty, &st) < 0) | |
902 | return -errno; | |
903 | ||
904 | *atime = timespec_load(&st.st_atim); | |
905 | return 0; | |
906 | } | |
907 | ||
908 | static int get_process_ctty_atime(pid_t pid, usec_t *atime) { | |
909 | _cleanup_free_ char *p = NULL; | |
910 | int r; | |
911 | ||
912 | assert(pid > 0); | |
913 | assert(atime); | |
914 | ||
915 | r = get_ctty(pid, NULL, &p); | |
916 | if (r < 0) | |
917 | return r; | |
918 | ||
919 | return get_tty_atime(p, atime); | |
920 | } | |
921 | ||
922 | int session_get_idle_hint(Session *s, dual_timestamp *t) { | |
23406ce5 LP |
923 | usec_t atime = 0, n; |
924 | int r; | |
a185c5aa LP |
925 | |
926 | assert(s); | |
927 | ||
23406ce5 | 928 | /* Explicit idle hint is set */ |
a185c5aa LP |
929 | if (s->idle_hint) { |
930 | if (t) | |
931 | *t = s->idle_hint_timestamp; | |
932 | ||
933 | return s->idle_hint; | |
934 | } | |
935 | ||
0762eaa3 | 936 | /* Graphical sessions should really implement a real |
23406ce5 | 937 | * idle hint logic */ |
129baf1b | 938 | if (SESSION_TYPE_IS_GRAPHICAL(s->type)) |
a185c5aa LP |
939 | goto dont_know; |
940 | ||
23406ce5 LP |
941 | /* For sessions with an explicitly configured tty, let's check |
942 | * its atime */ | |
943 | if (s->tty) { | |
944 | r = get_tty_atime(s->tty, &atime); | |
945 | if (r >= 0) | |
946 | goto found_atime; | |
947 | } | |
a185c5aa | 948 | |
23406ce5 LP |
949 | /* For sessions with a leader but no explicitly configured |
950 | * tty, let's check the controlling tty of the leader */ | |
238794b1 | 951 | if (pid_is_valid(s->leader)) { |
23406ce5 LP |
952 | r = get_process_ctty_atime(s->leader, &atime); |
953 | if (r >= 0) | |
954 | goto found_atime; | |
a185c5aa LP |
955 | } |
956 | ||
a185c5aa LP |
957 | dont_know: |
958 | if (t) | |
959 | *t = s->idle_hint_timestamp; | |
960 | ||
961 | return 0; | |
23406ce5 LP |
962 | |
963 | found_atime: | |
964 | if (t) | |
965 | dual_timestamp_from_realtime(t, atime); | |
966 | ||
967 | n = now(CLOCK_REALTIME); | |
968 | ||
969 | if (s->manager->idle_action_usec <= 0) | |
970 | return 0; | |
971 | ||
972 | return atime + s->manager->idle_action_usec <= n; | |
a185c5aa LP |
973 | } |
974 | ||
bef422ae LP |
975 | void session_set_idle_hint(Session *s, bool b) { |
976 | assert(s); | |
977 | ||
978 | if (s->idle_hint == b) | |
979 | return; | |
980 | ||
981 | s->idle_hint = b; | |
982 | dual_timestamp_get(&s->idle_hint_timestamp); | |
9418f147 | 983 | |
cc377381 | 984 | session_send_changed(s, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); |
9418f147 LP |
985 | |
986 | if (s->seat) | |
cc377381 LP |
987 | seat_send_changed(s->seat, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); |
988 | ||
989 | user_send_changed(s->user, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); | |
990 | manager_send_changed(s->manager, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); | |
991 | } | |
992 | ||
42d35e13 VT |
993 | int session_get_locked_hint(Session *s) { |
994 | assert(s); | |
995 | ||
996 | return s->locked_hint; | |
997 | } | |
998 | ||
999 | void session_set_locked_hint(Session *s, bool b) { | |
1000 | assert(s); | |
1001 | ||
1002 | if (s->locked_hint == b) | |
1003 | return; | |
1004 | ||
1005 | s->locked_hint = b; | |
1006 | ||
1007 | session_send_changed(s, "LockedHint", NULL); | |
1008 | } | |
1009 | ||
cc377381 LP |
1010 | static int session_dispatch_fifo(sd_event_source *es, int fd, uint32_t revents, void *userdata) { |
1011 | Session *s = userdata; | |
1012 | ||
1013 | assert(s); | |
1014 | assert(s->fifo_fd == fd); | |
1015 | ||
1016 | /* EOF on the FIFO means the session died abnormally. */ | |
1017 | ||
1018 | session_remove_fifo(s); | |
9bb69af4 | 1019 | session_stop(s, false); |
cc377381 LP |
1020 | |
1021 | return 1; | |
bef422ae LP |
1022 | } |
1023 | ||
932e3ee7 LP |
1024 | int session_create_fifo(Session *s) { |
1025 | int r; | |
1026 | ||
31b79c2b LP |
1027 | assert(s); |
1028 | ||
b4f78aea | 1029 | /* Create FIFO */ |
932e3ee7 | 1030 | if (!s->fifo_path) { |
37c1d5e9 | 1031 | r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0, MKDIR_WARN_MODE); |
e6061ab2 LP |
1032 | if (r < 0) |
1033 | return r; | |
1034 | ||
d5ddc930 LP |
1035 | s->fifo_path = strjoin("/run/systemd/sessions/", s->id, ".ref"); |
1036 | if (!s->fifo_path) | |
932e3ee7 | 1037 | return -ENOMEM; |
31b79c2b | 1038 | |
932e3ee7 LP |
1039 | if (mkfifo(s->fifo_path, 0600) < 0 && errno != EEXIST) |
1040 | return -errno; | |
1041 | } | |
31b79c2b | 1042 | |
932e3ee7 | 1043 | /* Open reading side */ |
b4f78aea | 1044 | if (s->fifo_fd < 0) { |
db4a47e9 | 1045 | s->fifo_fd = open(s->fifo_path, O_RDONLY|O_CLOEXEC|O_NONBLOCK); |
b4f78aea LP |
1046 | if (s->fifo_fd < 0) |
1047 | return -errno; | |
cc377381 LP |
1048 | } |
1049 | ||
1050 | if (!s->fifo_event_source) { | |
151b9b96 | 1051 | r = sd_event_add_io(s->manager->event, &s->fifo_event_source, s->fifo_fd, 0, session_dispatch_fifo, s); |
b4f78aea LP |
1052 | if (r < 0) |
1053 | return r; | |
1054 | ||
e11544a8 LP |
1055 | /* Let's make sure we noticed dead sessions before we process new bus requests (which might create new |
1056 | * sessions). */ | |
1057 | r = sd_event_source_set_priority(s->fifo_event_source, SD_EVENT_PRIORITY_NORMAL-10); | |
cc377381 LP |
1058 | if (r < 0) |
1059 | return r; | |
b4f78aea | 1060 | } |
932e3ee7 LP |
1061 | |
1062 | /* Open writing side */ | |
db4a47e9 | 1063 | r = open(s->fifo_path, O_WRONLY|O_CLOEXEC|O_NONBLOCK); |
932e3ee7 LP |
1064 | if (r < 0) |
1065 | return -errno; | |
31b79c2b | 1066 | |
932e3ee7 LP |
1067 | return r; |
1068 | } | |
1069 | ||
5f41d1f1 | 1070 | static void session_remove_fifo(Session *s) { |
932e3ee7 LP |
1071 | assert(s); |
1072 | ||
03e334a1 LP |
1073 | s->fifo_event_source = sd_event_source_unref(s->fifo_event_source); |
1074 | s->fifo_fd = safe_close(s->fifo_fd); | |
932e3ee7 LP |
1075 | |
1076 | if (s->fifo_path) { | |
75bbdf47 | 1077 | (void) unlink(s->fifo_path); |
a1e58e8e | 1078 | s->fifo_path = mfree(s->fifo_path); |
932e3ee7 | 1079 | } |
31b79c2b LP |
1080 | } |
1081 | ||
5c093a23 | 1082 | bool session_may_gc(Session *s, bool drop_not_started) { |
bd26aee1 LP |
1083 | int r; |
1084 | ||
20263082 LP |
1085 | assert(s); |
1086 | ||
4a4b033f | 1087 | if (drop_not_started && !s->started) |
5c093a23 | 1088 | return true; |
932e3ee7 | 1089 | |
9444b1f2 | 1090 | if (!s->user) |
5c093a23 | 1091 | return true; |
9444b1f2 | 1092 | |
932e3ee7 | 1093 | if (s->fifo_fd >= 0) { |
5f41d1f1 | 1094 | if (pipe_eof(s->fifo_fd) <= 0) |
5c093a23 | 1095 | return false; |
20263082 LP |
1096 | } |
1097 | ||
bd26aee1 LP |
1098 | if (s->scope_job) { |
1099 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; | |
1100 | ||
1101 | r = manager_job_is_active(s->manager, s->scope_job, &error); | |
1102 | if (r < 0) | |
1103 | log_debug_errno(r, "Failed to determine whether job '%s' is pending, ignoring: %s", s->scope_job, bus_error_message(&error, r)); | |
1104 | if (r != 0) | |
1105 | return false; | |
1106 | } | |
20263082 | 1107 | |
bd26aee1 LP |
1108 | if (s->scope) { |
1109 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; | |
1110 | ||
1111 | r = manager_unit_is_active(s->manager, s->scope, &error); | |
1112 | if (r < 0) | |
1113 | log_debug_errno(r, "Failed to determine whether unit '%s' is active, ignoring: %s", s->scope, bus_error_message(&error, r)); | |
1114 | if (r != 0) | |
1115 | return false; | |
1116 | } | |
20263082 | 1117 | |
5c093a23 | 1118 | return true; |
20263082 LP |
1119 | } |
1120 | ||
14c3baca LP |
1121 | void session_add_to_gc_queue(Session *s) { |
1122 | assert(s); | |
1123 | ||
1124 | if (s->in_gc_queue) | |
1125 | return; | |
1126 | ||
71fda00f | 1127 | LIST_PREPEND(gc_queue, s->manager->session_gc_queue, s); |
14c3baca LP |
1128 | s->in_gc_queue = true; |
1129 | } | |
1130 | ||
0604381b LP |
1131 | SessionState session_get_state(Session *s) { |
1132 | assert(s); | |
1133 | ||
8fe63cd4 | 1134 | /* always check closing first */ |
5f41d1f1 LP |
1135 | if (s->stopping || s->timer_event_source) |
1136 | return SESSION_CLOSING; | |
1137 | ||
8fe63cd4 | 1138 | if (s->scope_job || s->fifo_fd < 0) |
405e0255 | 1139 | return SESSION_OPENING; |
fb6becb4 | 1140 | |
0604381b LP |
1141 | if (session_is_active(s)) |
1142 | return SESSION_ACTIVE; | |
1143 | ||
1144 | return SESSION_ONLINE; | |
1145 | } | |
1146 | ||
de07ab16 | 1147 | int session_kill(Session *s, KillWho who, int signo) { |
de07ab16 LP |
1148 | assert(s); |
1149 | ||
fb6becb4 | 1150 | if (!s->scope) |
de07ab16 LP |
1151 | return -ESRCH; |
1152 | ||
fb6becb4 | 1153 | return manager_kill_unit(s->manager, s->scope, who, signo, NULL); |
de07ab16 LP |
1154 | } |
1155 | ||
90a18413 | 1156 | static int session_open_vt(Session *s) { |
5f41d1f1 | 1157 | char path[sizeof("/dev/tty") + DECIMAL_STR_MAX(s->vtnr)]; |
90a18413 | 1158 | |
baccf3e4 OB |
1159 | if (s->vtnr < 1) |
1160 | return -ENODEV; | |
90a18413 DH |
1161 | |
1162 | if (s->vtfd >= 0) | |
1163 | return s->vtfd; | |
1164 | ||
92bd5ff3 | 1165 | sprintf(path, "/dev/tty%u", s->vtnr); |
22356953 | 1166 | s->vtfd = open_terminal(path, O_RDWR | O_CLOEXEC | O_NONBLOCK | O_NOCTTY); |
4a62c710 | 1167 | if (s->vtfd < 0) |
709f6e46 | 1168 | return log_error_errno(s->vtfd, "cannot open VT %s of session %s: %m", path, s->id); |
90a18413 DH |
1169 | |
1170 | return s->vtfd; | |
1171 | } | |
1172 | ||
baccf3e4 | 1173 | int session_prepare_vt(Session *s) { |
90a18413 DH |
1174 | int vt, r; |
1175 | struct vt_mode mode = { 0 }; | |
90a18413 | 1176 | |
baccf3e4 OB |
1177 | if (s->vtnr < 1) |
1178 | return 0; | |
1179 | ||
90a18413 DH |
1180 | vt = session_open_vt(s); |
1181 | if (vt < 0) | |
baccf3e4 | 1182 | return vt; |
90a18413 | 1183 | |
d6176c6c | 1184 | r = fchown(vt, s->user->uid, -1); |
baccf3e4 | 1185 | if (r < 0) { |
94c156cd LP |
1186 | r = log_error_errno(errno, |
1187 | "Cannot change owner of /dev/tty%u: %m", | |
1188 | s->vtnr); | |
d6176c6c | 1189 | goto error; |
baccf3e4 | 1190 | } |
d6176c6c | 1191 | |
90a18413 | 1192 | r = ioctl(vt, KDSKBMODE, K_OFF); |
baccf3e4 | 1193 | if (r < 0) { |
94c156cd LP |
1194 | r = log_error_errno(errno, |
1195 | "Cannot set K_OFF on /dev/tty%u: %m", | |
1196 | s->vtnr); | |
90a18413 | 1197 | goto error; |
baccf3e4 | 1198 | } |
90a18413 DH |
1199 | |
1200 | r = ioctl(vt, KDSETMODE, KD_GRAPHICS); | |
baccf3e4 | 1201 | if (r < 0) { |
94c156cd LP |
1202 | r = log_error_errno(errno, |
1203 | "Cannot set KD_GRAPHICS on /dev/tty%u: %m", | |
1204 | s->vtnr); | |
90a18413 | 1205 | goto error; |
baccf3e4 | 1206 | } |
90a18413 | 1207 | |
90a18413 DH |
1208 | /* Oh, thanks to the VT layer, VT_AUTO does not work with KD_GRAPHICS. |
1209 | * So we need a dummy handler here which just acknowledges *all* VT | |
1210 | * switch requests. */ | |
1211 | mode.mode = VT_PROCESS; | |
92683ad2 DH |
1212 | mode.relsig = SIGRTMIN; |
1213 | mode.acqsig = SIGRTMIN + 1; | |
90a18413 | 1214 | r = ioctl(vt, VT_SETMODE, &mode); |
baccf3e4 | 1215 | if (r < 0) { |
94c156cd LP |
1216 | r = log_error_errno(errno, |
1217 | "Cannot set VT_PROCESS on /dev/tty%u: %m", | |
1218 | s->vtnr); | |
90a18413 | 1219 | goto error; |
baccf3e4 | 1220 | } |
90a18413 | 1221 | |
baccf3e4 | 1222 | return 0; |
90a18413 DH |
1223 | |
1224 | error: | |
90a18413 | 1225 | session_restore_vt(s); |
baccf3e4 | 1226 | return r; |
90a18413 DH |
1227 | } |
1228 | ||
0212126c | 1229 | static void session_restore_vt(Session *s) { |
ad96887a FB |
1230 | pid_t pid; |
1231 | int r; | |
128df4cf | 1232 | |
ad96887a FB |
1233 | if (s->vtnr < 1) |
1234 | return; | |
128df4cf | 1235 | |
ad96887a | 1236 | if (s->vtfd < 0) |
90a18413 DH |
1237 | return; |
1238 | ||
ad96887a FB |
1239 | /* The virtual terminal can potentially be entering in hung-up state at any time |
1240 | * depending on when the controlling process exits. | |
1241 | * | |
1242 | * If the controlling process exits while we're restoring the virtual terminal, | |
1243 | * the VT will enter in hung-up state and we'll fail at restoring it. To prevent | |
1244 | * this case, we kick off the current controlling process (if any) in a child | |
1245 | * process so logind doesn't play around with tty ownership. | |
1246 | * | |
1247 | * If the controlling process already exited, getting a fresh handle to the | |
1248 | * virtual terminal reset the hung-up state. */ | |
1249 | r = safe_fork("(logind)", FORK_REOPEN_LOG|FORK_CLOSE_ALL_FDS|FORK_RESET_SIGNALS|FORK_WAIT|FORK_LOG, &pid); | |
1250 | if (r == 0) { | |
1251 | char path[sizeof("/dev/tty") + DECIMAL_STR_MAX(s->vtnr)]; | |
1252 | int vt; | |
1253 | ||
1254 | /* We must be a session leader in order to become the controlling process. */ | |
1255 | pid = setsid(); | |
1256 | if (pid < 0) { | |
1257 | log_error_errno(errno, "Failed to become session leader: %m"); | |
1258 | _exit(EXIT_FAILURE); | |
1259 | } | |
1260 | ||
1261 | sprintf(path, "/dev/tty%u", s->vtnr); | |
1262 | vt = acquire_terminal(path, ACQUIRE_TERMINAL_FORCE, USEC_INFINITY); | |
1263 | if (vt < 0) { | |
1264 | log_error_errno(vt, "Cannot acquire VT %s of session %s: %m", path, s->id); | |
1265 | _exit(EXIT_FAILURE); | |
1266 | } | |
1267 | ||
1268 | r = vt_restore(vt); | |
1269 | if (r < 0) | |
1270 | log_warning_errno(r, "Failed to restore VT, ignoring: %m"); | |
1271 | ||
1272 | /* Give up and release the controlling terminal. */ | |
1273 | safe_close(vt); | |
1274 | _exit(EXIT_SUCCESS); | |
1275 | } | |
d6176c6c | 1276 | |
ad96887a | 1277 | /* Close the fd in any cases. */ |
03e334a1 | 1278 | s->vtfd = safe_close(s->vtfd); |
90a18413 DH |
1279 | } |
1280 | ||
2ec3ff66 | 1281 | void session_leave_vt(Session *s) { |
ce540a24 DH |
1282 | int r; |
1283 | ||
2ec3ff66 DH |
1284 | assert(s); |
1285 | ||
1286 | /* This is called whenever we get a VT-switch signal from the kernel. | |
1287 | * We acknowledge all of them unconditionally. Note that session are | |
1288 | * free to overwrite those handlers and we only register them for | |
1289 | * sessions with controllers. Legacy sessions are not affected. | |
1290 | * However, if we switch from a non-legacy to a legacy session, we must | |
1291 | * make sure to pause all device before acknowledging the switch. We | |
1292 | * process the real switch only after we are notified via sysfs, so the | |
1293 | * legacy session might have already started using the devices. If we | |
1294 | * don't pause the devices before the switch, we might confuse the | |
1295 | * session we switch to. */ | |
1296 | ||
1297 | if (s->vtfd < 0) | |
1298 | return; | |
1299 | ||
1300 | session_device_pause_all(s); | |
27dafac9 | 1301 | r = vt_release(s->vtfd, false); |
ce540a24 | 1302 | if (r < 0) |
27dafac9 | 1303 | log_debug_errno(r, "Cannot release VT of session %s: %m", s->id); |
2ec3ff66 DH |
1304 | } |
1305 | ||
cc377381 | 1306 | bool session_is_controller(Session *s, const char *sender) { |
ae5e06bd DH |
1307 | assert(s); |
1308 | ||
1309 | return streq_ptr(s->controller, sender); | |
1310 | } | |
1311 | ||
b12e5615 DH |
1312 | static void session_release_controller(Session *s, bool notify) { |
1313 | _cleanup_free_ char *name = NULL; | |
6d33772f DH |
1314 | SessionDevice *sd; |
1315 | ||
b12e5615 DH |
1316 | if (!s->controller) |
1317 | return; | |
6d33772f | 1318 | |
b12e5615 | 1319 | name = s->controller; |
90a18413 | 1320 | |
b12e5615 DH |
1321 | /* By resetting the controller before releasing the devices, we won't |
1322 | * send notification signals. This avoids sending useless notifications | |
1323 | * if the controller is released on disconnects. */ | |
1324 | if (!notify) | |
1325 | s->controller = NULL; | |
6d33772f | 1326 | |
b12e5615 DH |
1327 | while ((sd = hashmap_first(s->devices))) |
1328 | session_device_free(sd); | |
1329 | ||
1330 | s->controller = NULL; | |
3cde9e8f DM |
1331 | s->track = sd_bus_track_unref(s->track); |
1332 | } | |
1333 | ||
1334 | static int on_bus_track(sd_bus_track *track, void *userdata) { | |
1335 | Session *s = userdata; | |
1336 | ||
1337 | assert(track); | |
1338 | assert(s); | |
1339 | ||
1340 | session_drop_controller(s); | |
1341 | ||
1342 | return 0; | |
6d33772f DH |
1343 | } |
1344 | ||
dc6284e9 | 1345 | int session_set_controller(Session *s, const char *sender, bool force, bool prepare) { |
b12e5615 | 1346 | _cleanup_free_ char *name = NULL; |
ae5e06bd DH |
1347 | int r; |
1348 | ||
1349 | assert(s); | |
1350 | assert(sender); | |
1351 | ||
1352 | if (session_is_controller(s, sender)) | |
1353 | return 0; | |
1354 | if (s->controller && !force) | |
1355 | return -EBUSY; | |
1356 | ||
b12e5615 DH |
1357 | name = strdup(sender); |
1358 | if (!name) | |
ae5e06bd DH |
1359 | return -ENOMEM; |
1360 | ||
3cde9e8f DM |
1361 | s->track = sd_bus_track_unref(s->track); |
1362 | r = sd_bus_track_new(s->manager->bus, &s->track, on_bus_track, s); | |
1363 | if (r < 0) | |
1364 | return r; | |
1365 | ||
1366 | r = sd_bus_track_add_name(s->track, name); | |
1367 | if (r < 0) | |
ae5e06bd | 1368 | return r; |
ae5e06bd | 1369 | |
90a18413 DH |
1370 | /* When setting a session controller, we forcibly mute the VT and set |
1371 | * it into graphics-mode. Applications can override that by changing | |
1372 | * VT state after calling TakeControl(). However, this serves as a good | |
1373 | * default and well-behaving controllers can now ignore VTs entirely. | |
1374 | * Note that we reset the VT on ReleaseControl() and if the controller | |
1375 | * exits. | |
1376 | * If logind crashes/restarts, we restore the controller during restart | |
dc6284e9 FB |
1377 | * (without preparing the VT since the controller has probably overridden |
1378 | * VT state by now) or reset the VT in case it crashed/exited, too. */ | |
1379 | if (prepare) { | |
1380 | r = session_prepare_vt(s); | |
1381 | if (r < 0) { | |
1382 | s->track = sd_bus_track_unref(s->track); | |
1383 | return r; | |
1384 | } | |
13f493dc | 1385 | } |
baccf3e4 | 1386 | |
b12e5615 | 1387 | session_release_controller(s, true); |
ae2a15bc | 1388 | s->controller = TAKE_PTR(name); |
b12e5615 | 1389 | session_save(s); |
90a18413 | 1390 | |
ae5e06bd DH |
1391 | return 0; |
1392 | } | |
1393 | ||
1394 | void session_drop_controller(Session *s) { | |
1395 | assert(s); | |
1396 | ||
1397 | if (!s->controller) | |
1398 | return; | |
1399 | ||
3cde9e8f | 1400 | s->track = sd_bus_track_unref(s->track); |
b12e5615 DH |
1401 | session_release_controller(s, false); |
1402 | session_save(s); | |
1403 | session_restore_vt(s); | |
ae5e06bd DH |
1404 | } |
1405 | ||
fb6becb4 LP |
1406 | static const char* const session_state_table[_SESSION_STATE_MAX] = { |
1407 | [SESSION_OPENING] = "opening", | |
0604381b LP |
1408 | [SESSION_ONLINE] = "online", |
1409 | [SESSION_ACTIVE] = "active", | |
1410 | [SESSION_CLOSING] = "closing" | |
1411 | }; | |
1412 | ||
1413 | DEFINE_STRING_TABLE_LOOKUP(session_state, SessionState); | |
1414 | ||
20263082 | 1415 | static const char* const session_type_table[_SESSION_TYPE_MAX] = { |
2c5859af | 1416 | [SESSION_UNSPECIFIED] = "unspecified", |
3f49d45a | 1417 | [SESSION_TTY] = "tty", |
98a28fef | 1418 | [SESSION_X11] = "x11", |
d9eb81f9 | 1419 | [SESSION_WAYLAND] = "wayland", |
9541666b | 1420 | [SESSION_MIR] = "mir", |
e9e74f28 | 1421 | [SESSION_WEB] = "web", |
20263082 LP |
1422 | }; |
1423 | ||
1424 | DEFINE_STRING_TABLE_LOOKUP(session_type, SessionType); | |
de07ab16 | 1425 | |
55efac6c LP |
1426 | static const char* const session_class_table[_SESSION_CLASS_MAX] = { |
1427 | [SESSION_USER] = "user", | |
1428 | [SESSION_GREETER] = "greeter", | |
e2acb67b LP |
1429 | [SESSION_LOCK_SCREEN] = "lock-screen", |
1430 | [SESSION_BACKGROUND] = "background" | |
55efac6c LP |
1431 | }; |
1432 | ||
1433 | DEFINE_STRING_TABLE_LOOKUP(session_class, SessionClass); | |
1434 | ||
de07ab16 LP |
1435 | static const char* const kill_who_table[_KILL_WHO_MAX] = { |
1436 | [KILL_LEADER] = "leader", | |
1437 | [KILL_ALL] = "all" | |
1438 | }; | |
1439 | ||
1440 | DEFINE_STRING_TABLE_LOOKUP(kill_who, KillWho); | |
3d0ef5c7 LP |
1441 | |
1442 | static const char* const tty_validity_table[_TTY_VALIDITY_MAX] = { | |
1443 | [TTY_FROM_PAM] = "from-pam", | |
1444 | [TTY_FROM_UTMP] = "from-utmp", | |
1445 | [TTY_UTMP_INCONSISTENT] = "utmp-inconsistent", | |
1446 | }; | |
1447 | ||
1448 | DEFINE_STRING_TABLE_LOOKUP(tty_validity, TTYValidity); |