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Commit | Line | Data |
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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
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> |
90a18413 | 8 | #include <sys/ioctl.h> |
ca78ad1d | 9 | #include <sys/stat.h> |
20263082 LP |
10 | #include <unistd.h> |
11 | ||
cc377381 | 12 | #include "sd-messages.h" |
4f5dd394 | 13 | |
b5efdb8a | 14 | #include "alloc-util.h" |
430f0182 | 15 | #include "audit-util.h" |
cc377381 | 16 | #include "bus-error.h" |
4f5dd394 | 17 | #include "bus-util.h" |
686d13b9 | 18 | #include "env-file.h" |
4f5dd394 | 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" |
6ecda0fb LP |
24 | #include "logind-dbus.h" |
25 | #include "logind-seat-dbus.h" | |
26 | #include "logind-session-dbus.h" | |
3ffd4af2 | 27 | #include "logind-session.h" |
6ecda0fb | 28 | #include "logind-user-dbus.h" |
4f5dd394 | 29 | #include "mkdir.h" |
6bedfcbb | 30 | #include "parse-util.h" |
4f5dd394 | 31 | #include "path-util.h" |
8c29a457 | 32 | #include "process-util.h" |
d68c645b | 33 | #include "serialize.h" |
8b43440b | 34 | #include "string-table.h" |
25a1ab4e | 35 | #include "strv.h" |
288a74cc | 36 | #include "terminal-util.h" |
e4de7287 | 37 | #include "tmpfile-util.h" |
b1d4f8e1 | 38 | #include "user-util.h" |
4f5dd394 | 39 | #include "util.h" |
20263082 | 40 | |
5f41d1f1 LP |
41 | #define RELEASE_USEC (20*USEC_PER_SEC) |
42 | ||
43 | static void session_remove_fifo(Session *s); | |
0212126c | 44 | static void session_restore_vt(Session *s); |
5f41d1f1 | 45 | |
8c29a457 LP |
46 | int session_new(Session **ret, Manager *m, const char *id) { |
47 | _cleanup_(session_freep) Session *s = NULL; | |
48 | int r; | |
20263082 | 49 | |
8c29a457 | 50 | assert(ret); |
20263082 LP |
51 | assert(m); |
52 | assert(id); | |
53 | ||
8c29a457 LP |
54 | if (!session_id_valid(id)) |
55 | return -EINVAL; | |
56 | ||
57 | s = new(Session, 1); | |
20263082 | 58 | if (!s) |
8c29a457 LP |
59 | return -ENOMEM; |
60 | ||
61 | *s = (Session) { | |
62 | .manager = m, | |
63 | .fifo_fd = -1, | |
64 | .vtfd = -1, | |
65 | .audit_id = AUDIT_SESSION_INVALID, | |
3d0ef5c7 | 66 | .tty_validity = _TTY_VALIDITY_INVALID, |
8c29a457 | 67 | }; |
20263082 | 68 | |
b910cc72 | 69 | s->state_file = path_join("/run/systemd/sessions", id); |
6b430fdb | 70 | if (!s->state_file) |
8c29a457 | 71 | return -ENOMEM; |
118ecf32 | 72 | |
2b6bf07d | 73 | s->id = basename(s->state_file); |
20263082 | 74 | |
8c29a457 LP |
75 | s->devices = hashmap_new(&devt_hash_ops); |
76 | if (!s->devices) | |
77 | return -ENOMEM; | |
20263082 | 78 | |
8c29a457 LP |
79 | r = hashmap_put(m->sessions, s->id, s); |
80 | if (r < 0) | |
81 | return r; | |
20263082 | 82 | |
8c29a457 LP |
83 | *ret = TAKE_PTR(s); |
84 | return 0; | |
20263082 LP |
85 | } |
86 | ||
8c29a457 | 87 | Session* session_free(Session *s) { |
118ecf32 DH |
88 | SessionDevice *sd; |
89 | ||
8c29a457 LP |
90 | if (!s) |
91 | return NULL; | |
20263082 | 92 | |
14c3baca | 93 | if (s->in_gc_queue) |
71fda00f | 94 | LIST_REMOVE(gc_queue, s->manager->session_gc_queue, s); |
14c3baca | 95 | |
5f41d1f1 LP |
96 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
97 | ||
ae5e06bd DH |
98 | session_drop_controller(s); |
99 | ||
118ecf32 DH |
100 | while ((sd = hashmap_first(s->devices))) |
101 | session_device_free(sd); | |
102 | ||
103 | hashmap_free(s->devices); | |
104 | ||
20263082 | 105 | if (s->user) { |
71fda00f | 106 | LIST_REMOVE(sessions_by_user, s->user->sessions, s); |
20263082 LP |
107 | |
108 | if (s->user->display == s) | |
109 | s->user->display = NULL; | |
9afe9efb LP |
110 | |
111 | user_update_last_session_timer(s->user); | |
20263082 LP |
112 | } |
113 | ||
9418f147 LP |
114 | if (s->seat) { |
115 | if (s->seat->active == s) | |
116 | s->seat->active = NULL; | |
d7bd01b5 DH |
117 | if (s->seat->pending_switch == s) |
118 | s->seat->pending_switch = NULL; | |
9418f147 | 119 | |
49e6fdbf | 120 | seat_evict_position(s->seat, s); |
71fda00f | 121 | LIST_REMOVE(sessions_by_seat, s->seat->sessions, s); |
9418f147 | 122 | } |
20263082 | 123 | |
fb6becb4 LP |
124 | if (s->scope) { |
125 | hashmap_remove(s->manager->session_units, s->scope); | |
126 | free(s->scope); | |
127 | } | |
128 | ||
238794b1 LP |
129 | if (pid_is_valid(s->leader)) |
130 | (void) hashmap_remove_value(s->manager->sessions_by_leader, PID_TO_PTR(s->leader), s); | |
131 | ||
fb6becb4 | 132 | free(s->scope_job); |
1713813d | 133 | |
cc377381 | 134 | sd_bus_message_unref(s->create_message); |
20263082 LP |
135 | |
136 | free(s->tty); | |
137 | free(s->display); | |
138 | free(s->remote_host); | |
3f49d45a | 139 | free(s->remote_user); |
98a28fef | 140 | free(s->service); |
a4cd87e9 | 141 | free(s->desktop); |
20263082 LP |
142 | |
143 | hashmap_remove(s->manager->sessions, s->id); | |
98a28fef | 144 | |
c20b8dad LP |
145 | sd_event_source_unref(s->fifo_event_source); |
146 | safe_close(s->fifo_fd); | |
147 | ||
148 | /* Note that we remove neither the state file nor the fifo path here, since we want both to survive | |
149 | * daemon restarts */ | |
d2f92cdf | 150 | free(s->state_file); |
c20b8dad | 151 | free(s->fifo_path); |
8c29a457 LP |
152 | |
153 | return mfree(s); | |
20263082 LP |
154 | } |
155 | ||
9444b1f2 LP |
156 | void session_set_user(Session *s, User *u) { |
157 | assert(s); | |
158 | assert(!s->user); | |
159 | ||
160 | s->user = u; | |
71fda00f | 161 | LIST_PREPEND(sessions_by_user, u->sessions, s); |
9afe9efb LP |
162 | |
163 | user_update_last_session_timer(u); | |
9444b1f2 LP |
164 | } |
165 | ||
238794b1 LP |
166 | int session_set_leader(Session *s, pid_t pid) { |
167 | int r; | |
168 | ||
169 | assert(s); | |
170 | ||
171 | if (!pid_is_valid(pid)) | |
172 | return -EINVAL; | |
173 | ||
174 | if (s->leader == pid) | |
175 | return 0; | |
176 | ||
177 | r = hashmap_put(s->manager->sessions_by_leader, PID_TO_PTR(pid), s); | |
178 | if (r < 0) | |
179 | return r; | |
180 | ||
181 | if (pid_is_valid(s->leader)) | |
182 | (void) hashmap_remove_value(s->manager->sessions_by_leader, PID_TO_PTR(s->leader), s); | |
183 | ||
184 | s->leader = pid; | |
185 | (void) audit_session_from_pid(pid, &s->audit_id); | |
186 | ||
187 | return 1; | |
188 | } | |
189 | ||
aed24c4c FB |
190 | static void session_save_devices(Session *s, FILE *f) { |
191 | SessionDevice *sd; | |
aed24c4c FB |
192 | |
193 | if (!hashmap_isempty(s->devices)) { | |
194 | fprintf(f, "DEVICES="); | |
90e74a66 | 195 | HASHMAP_FOREACH(sd, s->devices) |
aed24c4c FB |
196 | fprintf(f, "%u:%u ", major(sd->dev), minor(sd->dev)); |
197 | fprintf(f, "\n"); | |
198 | } | |
199 | } | |
200 | ||
20263082 | 201 | int session_save(Session *s) { |
507f22bd | 202 | _cleanup_free_ char *temp_path = NULL; |
cc377381 | 203 | _cleanup_fclose_ FILE *f = NULL; |
6d95e7d9 | 204 | int r; |
20263082 LP |
205 | |
206 | assert(s); | |
207 | ||
9444b1f2 LP |
208 | if (!s->user) |
209 | return -ESTALE; | |
210 | ||
accaeded LP |
211 | if (!s->started) |
212 | return 0; | |
213 | ||
37c1d5e9 | 214 | r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0, MKDIR_WARN_MODE); |
20263082 | 215 | if (r < 0) |
dacd6cee | 216 | goto fail; |
20263082 | 217 | |
14c3baca LP |
218 | r = fopen_temporary(s->state_file, &f, &temp_path); |
219 | if (r < 0) | |
dacd6cee | 220 | goto fail; |
20263082 | 221 | |
44176400 | 222 | (void) fchmod(fileno(f), 0644); |
14c3baca | 223 | |
20263082 LP |
224 | fprintf(f, |
225 | "# This is private data. Do not parse.\n" | |
90b2de37 | 226 | "UID="UID_FMT"\n" |
20263082 LP |
227 | "USER=%s\n" |
228 | "ACTIVE=%i\n" | |
1c8280fd | 229 | "IS_DISPLAY=%i\n" |
0604381b | 230 | "STATE=%s\n" |
fb6becb4 | 231 | "REMOTE=%i\n", |
22c902fa LP |
232 | s->user->user_record->uid, |
233 | s->user->user_record->user_name, | |
20263082 | 234 | session_is_active(s), |
1c8280fd | 235 | s->user->display == s, |
0604381b | 236 | session_state_to_string(session_get_state(s)), |
fb6becb4 | 237 | s->remote); |
20263082 | 238 | |
a91e4e53 | 239 | if (s->type >= 0) |
507f22bd | 240 | fprintf(f, "TYPE=%s\n", session_type_to_string(s->type)); |
a91e4e53 | 241 | |
db72aea4 CH |
242 | if (s->original_type >= 0) |
243 | fprintf(f, "ORIGINAL_TYPE=%s\n", session_type_to_string(s->original_type)); | |
244 | ||
55efac6c | 245 | if (s->class >= 0) |
507f22bd | 246 | fprintf(f, "CLASS=%s\n", session_class_to_string(s->class)); |
55efac6c | 247 | |
fb6becb4 LP |
248 | if (s->scope) |
249 | fprintf(f, "SCOPE=%s\n", s->scope); | |
fb6becb4 LP |
250 | if (s->scope_job) |
251 | fprintf(f, "SCOPE_JOB=%s\n", s->scope_job); | |
20263082 | 252 | |
932e3ee7 | 253 | if (s->fifo_path) |
507f22bd | 254 | fprintf(f, "FIFO=%s\n", s->fifo_path); |
932e3ee7 | 255 | |
20263082 | 256 | if (s->seat) |
507f22bd | 257 | fprintf(f, "SEAT=%s\n", s->seat->id); |
20263082 LP |
258 | |
259 | if (s->tty) | |
507f22bd | 260 | fprintf(f, "TTY=%s\n", s->tty); |
20263082 | 261 | |
3d0ef5c7 LP |
262 | if (s->tty_validity >= 0) |
263 | fprintf(f, "TTY_VALIDITY=%s\n", tty_validity_to_string(s->tty_validity)); | |
264 | ||
20263082 | 265 | if (s->display) |
507f22bd | 266 | fprintf(f, "DISPLAY=%s\n", s->display); |
20263082 | 267 | |
558c6490 | 268 | if (s->remote_host) { |
c2b2df60 | 269 | _cleanup_free_ char *escaped = NULL; |
558c6490 LP |
270 | |
271 | escaped = cescape(s->remote_host); | |
272 | if (!escaped) { | |
273 | r = -ENOMEM; | |
dacd6cee | 274 | goto fail; |
558c6490 LP |
275 | } |
276 | ||
277 | fprintf(f, "REMOTE_HOST=%s\n", escaped); | |
278 | } | |
279 | ||
280 | if (s->remote_user) { | |
c2b2df60 | 281 | _cleanup_free_ char *escaped = NULL; |
558c6490 LP |
282 | |
283 | escaped = cescape(s->remote_user); | |
284 | if (!escaped) { | |
285 | r = -ENOMEM; | |
dacd6cee | 286 | goto fail; |
558c6490 LP |
287 | } |
288 | ||
289 | fprintf(f, "REMOTE_USER=%s\n", escaped); | |
290 | } | |
291 | ||
292 | if (s->service) { | |
c2b2df60 | 293 | _cleanup_free_ char *escaped = NULL; |
20263082 | 294 | |
558c6490 LP |
295 | escaped = cescape(s->service); |
296 | if (!escaped) { | |
297 | r = -ENOMEM; | |
dacd6cee | 298 | goto fail; |
558c6490 LP |
299 | } |
300 | ||
301 | fprintf(f, "SERVICE=%s\n", escaped); | |
302 | } | |
3f49d45a | 303 | |
558c6490 | 304 | if (s->desktop) { |
c2b2df60 | 305 | _cleanup_free_ char *escaped = NULL; |
98a28fef | 306 | |
558c6490 LP |
307 | escaped = cescape(s->desktop); |
308 | if (!escaped) { | |
309 | r = -ENOMEM; | |
dacd6cee | 310 | goto fail; |
558c6490 LP |
311 | } |
312 | ||
313 | fprintf(f, "DESKTOP=%s\n", escaped); | |
314 | } | |
a4cd87e9 | 315 | |
bf7825ae | 316 | if (s->seat && seat_has_vts(s->seat)) |
92bd5ff3 | 317 | fprintf(f, "VTNR=%u\n", s->vtnr); |
20263082 | 318 | |
49e6fdbf | 319 | if (!s->vtnr) |
e6494a07 | 320 | fprintf(f, "POSITION=%u\n", s->position); |
49e6fdbf | 321 | |
54191eb3 | 322 | if (pid_is_valid(s->leader)) |
90b2de37 | 323 | fprintf(f, "LEADER="PID_FMT"\n", s->leader); |
20263082 | 324 | |
3a87a86e | 325 | if (audit_session_is_valid(s->audit_id)) |
507f22bd | 326 | fprintf(f, "AUDIT=%"PRIu32"\n", s->audit_id); |
20263082 | 327 | |
9444b1f2 LP |
328 | if (dual_timestamp_is_set(&s->timestamp)) |
329 | fprintf(f, | |
90b2de37 ZJS |
330 | "REALTIME="USEC_FMT"\n" |
331 | "MONOTONIC="USEC_FMT"\n", | |
332 | s->timestamp.realtime, | |
333 | s->timestamp.monotonic); | |
9444b1f2 | 334 | |
aed24c4c | 335 | if (s->controller) { |
6d33772f | 336 | fprintf(f, "CONTROLLER=%s\n", s->controller); |
aed24c4c FB |
337 | session_save_devices(s, f); |
338 | } | |
6d33772f | 339 | |
dacd6cee LP |
340 | r = fflush_and_check(f); |
341 | if (r < 0) | |
342 | goto fail; | |
14c3baca | 343 | |
dacd6cee | 344 | if (rename(temp_path, s->state_file) < 0) { |
20263082 | 345 | r = -errno; |
dacd6cee | 346 | goto fail; |
20263082 LP |
347 | } |
348 | ||
dacd6cee LP |
349 | return 0; |
350 | ||
351 | fail: | |
352 | (void) unlink(s->state_file); | |
14c3baca | 353 | |
dacd6cee LP |
354 | if (temp_path) |
355 | (void) unlink(temp_path); | |
356 | ||
357 | return log_error_errno(r, "Failed to save session data %s: %m", s->state_file); | |
20263082 LP |
358 | } |
359 | ||
aed24c4c FB |
360 | static int session_load_devices(Session *s, const char *devices) { |
361 | const char *p; | |
362 | int r = 0; | |
363 | ||
364 | assert(s); | |
365 | ||
366 | for (p = devices;;) { | |
367 | _cleanup_free_ char *word = NULL; | |
368 | SessionDevice *sd; | |
369 | dev_t dev; | |
370 | int k; | |
371 | ||
372 | k = extract_first_word(&p, &word, NULL, 0); | |
373 | if (k == 0) | |
374 | break; | |
375 | if (k < 0) { | |
376 | r = k; | |
377 | break; | |
378 | } | |
379 | ||
380 | k = parse_dev(word, &dev); | |
381 | if (k < 0) { | |
382 | r = k; | |
383 | continue; | |
384 | } | |
385 | ||
386 | /* The file descriptors for loaded devices will be reattached later. */ | |
387 | k = session_device_new(s, dev, false, &sd); | |
388 | if (k < 0) | |
389 | r = k; | |
390 | } | |
391 | ||
392 | if (r < 0) | |
393 | log_error_errno(r, "Loading session devices for session %s failed: %m", s->id); | |
394 | ||
395 | return r; | |
396 | } | |
dacd6cee | 397 | |
20263082 | 398 | int session_load(Session *s) { |
9444b1f2 | 399 | _cleanup_free_ char *remote = NULL, |
a185c5aa | 400 | *seat = NULL, |
3d0ef5c7 | 401 | *tty_validity = NULL, |
a185c5aa | 402 | *vtnr = NULL, |
be94d954 | 403 | *state = NULL, |
e6494a07 | 404 | *position = NULL, |
a185c5aa | 405 | *leader = NULL, |
55efac6c | 406 | *type = NULL, |
db72aea4 | 407 | *original_type = NULL, |
9444b1f2 LP |
408 | *class = NULL, |
409 | *uid = NULL, | |
410 | *realtime = NULL, | |
6d33772f | 411 | *monotonic = NULL, |
aed24c4c FB |
412 | *controller = NULL, |
413 | *active = NULL, | |
1c8280fd LP |
414 | *devices = NULL, |
415 | *is_display = NULL; | |
a185c5aa LP |
416 | |
417 | int k, r; | |
418 | ||
20263082 LP |
419 | assert(s); |
420 | ||
aa8fbc74 | 421 | r = parse_env_file(NULL, s->state_file, |
a185c5aa | 422 | "REMOTE", &remote, |
fb6becb4 LP |
423 | "SCOPE", &s->scope, |
424 | "SCOPE_JOB", &s->scope_job, | |
932e3ee7 | 425 | "FIFO", &s->fifo_path, |
a185c5aa LP |
426 | "SEAT", &seat, |
427 | "TTY", &s->tty, | |
3d0ef5c7 | 428 | "TTY_VALIDITY", &tty_validity, |
a185c5aa LP |
429 | "DISPLAY", &s->display, |
430 | "REMOTE_HOST", &s->remote_host, | |
431 | "REMOTE_USER", &s->remote_user, | |
98a28fef | 432 | "SERVICE", &s->service, |
a4cd87e9 | 433 | "DESKTOP", &s->desktop, |
a185c5aa | 434 | "VTNR", &vtnr, |
be94d954 | 435 | "STATE", &state, |
e6494a07 | 436 | "POSITION", &position, |
a185c5aa | 437 | "LEADER", &leader, |
a91e4e53 | 438 | "TYPE", &type, |
db72aea4 | 439 | "ORIGINAL_TYPE", &original_type, |
55efac6c | 440 | "CLASS", &class, |
9444b1f2 LP |
441 | "UID", &uid, |
442 | "REALTIME", &realtime, | |
443 | "MONOTONIC", &monotonic, | |
6d33772f | 444 | "CONTROLLER", &controller, |
aed24c4c FB |
445 | "ACTIVE", &active, |
446 | "DEVICES", &devices, | |
13df9c39 | 447 | "IS_DISPLAY", &is_display); |
a185c5aa | 448 | |
f647962d MS |
449 | if (r < 0) |
450 | return log_error_errno(r, "Failed to read %s: %m", s->state_file); | |
9444b1f2 LP |
451 | |
452 | if (!s->user) { | |
453 | uid_t u; | |
454 | User *user; | |
455 | ||
baaa35ad ZJS |
456 | if (!uid) |
457 | return log_error_errno(SYNTHETIC_ERRNO(ENOENT), | |
458 | "UID not specified for session %s", | |
459 | s->id); | |
9444b1f2 LP |
460 | |
461 | r = parse_uid(uid, &u); | |
462 | if (r < 0) { | |
463 | log_error("Failed to parse UID value %s for session %s.", uid, s->id); | |
464 | return r; | |
465 | } | |
466 | ||
8cb4ab00 | 467 | user = hashmap_get(s->manager->users, UID_TO_PTR(u)); |
baaa35ad ZJS |
468 | if (!user) |
469 | return log_error_errno(SYNTHETIC_ERRNO(ENOENT), | |
470 | "User of session %s not known.", | |
471 | s->id); | |
9444b1f2 LP |
472 | |
473 | session_set_user(s, user); | |
474 | } | |
a185c5aa LP |
475 | |
476 | if (remote) { | |
477 | k = parse_boolean(remote); | |
478 | if (k >= 0) | |
479 | s->remote = k; | |
480 | } | |
481 | ||
c506027a DH |
482 | if (vtnr) |
483 | safe_atou(vtnr, &s->vtnr); | |
484 | ||
9418f147 | 485 | if (seat && !s->seat) { |
a185c5aa LP |
486 | Seat *o; |
487 | ||
488 | o = hashmap_get(s->manager->seats, seat); | |
489 | if (o) | |
c506027a DH |
490 | r = seat_attach_session(o, s); |
491 | if (!o || r < 0) | |
492 | log_error("Cannot attach session %s to seat %s", s->id, seat); | |
a185c5aa LP |
493 | } |
494 | ||
c506027a DH |
495 | if (!s->seat || !seat_has_vts(s->seat)) |
496 | s->vtnr = 0; | |
a185c5aa | 497 | |
e6494a07 | 498 | if (position && s->seat) { |
14cb109d | 499 | unsigned npos; |
49e6fdbf | 500 | |
e6494a07 | 501 | safe_atou(position, &npos); |
49e6fdbf DH |
502 | seat_claim_position(s->seat, s, npos); |
503 | } | |
504 | ||
3d0ef5c7 LP |
505 | if (tty_validity) { |
506 | TTYValidity v; | |
507 | ||
508 | v = tty_validity_from_string(tty_validity); | |
509 | if (v < 0) | |
510 | log_debug("Failed to parse TTY validity: %s", tty_validity); | |
511 | else | |
512 | s->tty_validity = v; | |
513 | } | |
514 | ||
a185c5aa | 515 | if (leader) { |
238794b1 LP |
516 | pid_t pid; |
517 | ||
518 | r = parse_pid(leader, &pid); | |
519 | if (r < 0) | |
520 | log_debug_errno(r, "Failed to parse leader PID of session: %s", leader); | |
521 | else { | |
522 | r = session_set_leader(s, pid); | |
523 | if (r < 0) | |
524 | log_warning_errno(r, "Failed to set session leader PID, ignoring: %m"); | |
525 | } | |
a185c5aa LP |
526 | } |
527 | ||
a91e4e53 LP |
528 | if (type) { |
529 | SessionType t; | |
530 | ||
531 | t = session_type_from_string(type); | |
532 | if (t >= 0) | |
533 | s->type = t; | |
534 | } | |
535 | ||
db72aea4 CH |
536 | if (original_type) { |
537 | SessionType ot; | |
538 | ||
539 | ot = session_type_from_string(original_type); | |
540 | if (ot >= 0) | |
541 | s->original_type = ot; | |
542 | } else | |
543 | /* Pre-v246 compat: initialize original_type if not set in the state file */ | |
544 | s->original_type = s->type; | |
545 | ||
55efac6c LP |
546 | if (class) { |
547 | SessionClass c; | |
548 | ||
549 | c = session_class_from_string(class); | |
550 | if (c >= 0) | |
551 | s->class = c; | |
552 | } | |
553 | ||
be94d954 MP |
554 | if (state && streq(state, "closing")) |
555 | s->stopping = true; | |
556 | ||
b4f78aea LP |
557 | if (s->fifo_path) { |
558 | int fd; | |
559 | ||
560 | /* If we open an unopened pipe for reading we will not | |
561 | get an EOF. to trigger an EOF we hence open it for | |
be94d954 MP |
562 | writing, but close it right away which then will |
563 | trigger the EOF. This will happen immediately if no | |
564 | other process has the FIFO open for writing, i. e. | |
565 | when the session died before logind (re)started. */ | |
b4f78aea LP |
566 | |
567 | fd = session_create_fifo(s); | |
03e334a1 | 568 | safe_close(fd); |
b4f78aea LP |
569 | } |
570 | ||
b895a735 | 571 | if (realtime) |
d68c645b | 572 | (void) deserialize_usec(realtime, &s->timestamp.realtime); |
b895a735 | 573 | if (monotonic) |
d68c645b | 574 | (void) deserialize_usec(monotonic, &s->timestamp.monotonic); |
a185c5aa | 575 | |
aed24c4c FB |
576 | if (active) { |
577 | k = parse_boolean(active); | |
578 | if (k >= 0) | |
579 | s->was_active = k; | |
580 | } | |
581 | ||
1c8280fd LP |
582 | if (is_display) { |
583 | /* Note that when enumerating users are loaded before sessions, hence the display session to use is | |
584 | * something we have to store along with the session and not the user, as in that case we couldn't | |
585 | * apply it at the time we load the user. */ | |
586 | ||
587 | k = parse_boolean(is_display); | |
588 | if (k < 0) | |
589 | log_warning_errno(k, "Failed to parse IS_DISPLAY session property: %m"); | |
590 | else if (k > 0) | |
591 | s->user->display = s; | |
592 | } | |
593 | ||
6d33772f | 594 | if (controller) { |
aed24c4c | 595 | if (bus_name_has_owner(s->manager->bus, controller, NULL) > 0) { |
dc6284e9 | 596 | session_set_controller(s, controller, false, false); |
aed24c4c FB |
597 | session_load_devices(s, devices); |
598 | } else | |
90a18413 | 599 | session_restore_vt(s); |
6d33772f DH |
600 | } |
601 | ||
a185c5aa | 602 | return r; |
20263082 LP |
603 | } |
604 | ||
605 | int session_activate(Session *s) { | |
14cb109d | 606 | unsigned num_pending; |
d7bd01b5 | 607 | |
20263082 | 608 | assert(s); |
9444b1f2 | 609 | assert(s->user); |
20263082 | 610 | |
20263082 | 611 | if (!s->seat) |
15411c0c | 612 | return -EOPNOTSUPP; |
20263082 LP |
613 | |
614 | if (s->seat->active == s) | |
615 | return 0; | |
616 | ||
d7bd01b5 DH |
617 | /* on seats with VTs, we let VTs manage session-switching */ |
618 | if (seat_has_vts(s->seat)) { | |
709d0587 | 619 | if (s->vtnr == 0) |
15411c0c | 620 | return -EOPNOTSUPP; |
d7bd01b5 DH |
621 | |
622 | return chvt(s->vtnr); | |
623 | } | |
624 | ||
625 | /* On seats without VTs, we implement session-switching in logind. We | |
626 | * try to pause all session-devices and wait until the session | |
627 | * controller acknowledged them. Once all devices are asleep, we simply | |
628 | * switch the active session and be done. | |
629 | * We save the session we want to switch to in seat->pending_switch and | |
630 | * seat_complete_switch() will perform the final switch. */ | |
631 | ||
632 | s->seat->pending_switch = s; | |
633 | ||
634 | /* if no devices are running, immediately perform the session switch */ | |
635 | num_pending = session_device_try_pause_all(s); | |
636 | if (!num_pending) | |
637 | seat_complete_switch(s->seat); | |
20263082 | 638 | |
d7bd01b5 | 639 | return 0; |
20263082 LP |
640 | } |
641 | ||
25a1ab4e | 642 | static int session_start_scope(Session *s, sd_bus_message *properties, sd_bus_error *error) { |
98a28fef LP |
643 | int r; |
644 | ||
645 | assert(s); | |
9444b1f2 | 646 | assert(s->user); |
98a28fef | 647 | |
fb6becb4 | 648 | if (!s->scope) { |
fb2367ed | 649 | _cleanup_free_ char *scope = NULL; |
90558f31 | 650 | const char *description; |
405e0255 | 651 | |
25a1ab4e LP |
652 | s->scope_job = mfree(s->scope_job); |
653 | ||
605405c6 | 654 | scope = strjoin("session-", s->id, ".scope"); |
d0af76e6 | 655 | if (!scope) |
ae018d9b LP |
656 | return log_oom(); |
657 | ||
0a59216c | 658 | description = strjoina("Session ", s->id, " of User ", s->user->user_record->user_name); |
90558f31 LP |
659 | |
660 | r = manager_start_scope( | |
661 | s->manager, | |
662 | scope, | |
663 | s->leader, | |
664 | s->user->slice, | |
665 | description, | |
124d7cb2 ZJS |
666 | /* These two have StopWhenUnneeded= set, hence add a dep towards them */ |
667 | STRV_MAKE(s->user->runtime_dir_service, | |
668 | s->user->service), | |
669 | /* And order us after some more */ | |
670 | STRV_MAKE("systemd-logind.service", | |
671 | "systemd-user-sessions.service", | |
672 | s->user->runtime_dir_service, | |
673 | s->user->service), | |
22c902fa | 674 | user_record_home_directory(s->user->user_record), |
22f93314 | 675 | properties, |
25a1ab4e LP |
676 | error, |
677 | &s->scope_job); | |
fb2367ed | 678 | if (r < 0) |
124d7cb2 ZJS |
679 | return log_error_errno(r, "Failed to start session scope %s: %s", |
680 | scope, bus_error_message(error, r)); | |
fb2367ed YW |
681 | |
682 | s->scope = TAKE_PTR(scope); | |
20263082 LP |
683 | } |
684 | ||
124d7cb2 | 685 | (void) hashmap_put(s->manager->session_units, s->scope, s); |
d0af76e6 | 686 | |
20263082 LP |
687 | return 0; |
688 | } | |
689 | ||
25a1ab4e | 690 | int session_start(Session *s, sd_bus_message *properties, sd_bus_error *error) { |
20263082 LP |
691 | int r; |
692 | ||
693 | assert(s); | |
9444b1f2 LP |
694 | |
695 | if (!s->user) | |
696 | return -ESTALE; | |
20263082 | 697 | |
25a1ab4e LP |
698 | if (s->stopping) |
699 | return -EINVAL; | |
700 | ||
9418f147 LP |
701 | if (s->started) |
702 | return 0; | |
703 | ||
ed18b08b LP |
704 | r = user_start(s->user); |
705 | if (r < 0) | |
706 | return r; | |
707 | ||
25a1ab4e | 708 | r = session_start_scope(s, properties, error); |
fb6becb4 LP |
709 | if (r < 0) |
710 | return r; | |
711 | ||
d9eb81f9 | 712 | log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO, |
2b044526 | 713 | "MESSAGE_ID=" SD_MESSAGE_SESSION_START_STR, |
877d54e9 | 714 | "SESSION_ID=%s", s->id, |
22c902fa | 715 | "USER_ID=%s", s->user->user_record->user_name, |
de0671ee | 716 | "LEADER="PID_FMT, s->leader, |
22c902fa | 717 | LOG_MESSAGE("New session %s of user %s.", s->id, s->user->user_record->user_name)); |
98a28fef | 718 | |
9444b1f2 LP |
719 | if (!dual_timestamp_is_set(&s->timestamp)) |
720 | dual_timestamp_get(&s->timestamp); | |
14c3baca | 721 | |
e9816c48 LP |
722 | if (s->seat) |
723 | seat_read_active_vt(s->seat); | |
724 | ||
9418f147 LP |
725 | s->started = true; |
726 | ||
952d3260 LP |
727 | user_elect_display(s->user); |
728 | ||
5f41d1f1 | 729 | /* Save data */ |
e9816c48 | 730 | session_save(s); |
7f7bb946 | 731 | user_save(s->user); |
5f41d1f1 LP |
732 | if (s->seat) |
733 | seat_save(s->seat); | |
e9816c48 | 734 | |
5f41d1f1 | 735 | /* Send signals */ |
da119395 | 736 | session_send_signal(s, true); |
7d049e30 | 737 | user_send_changed(s->user, "Display", NULL); |
40771cf5 LP |
738 | |
739 | if (s->seat && s->seat->active == s) | |
740 | seat_send_changed(s->seat, "ActiveSession", NULL); | |
9418f147 | 741 | |
20263082 LP |
742 | return 0; |
743 | } | |
744 | ||
9bb69af4 | 745 | static int session_stop_scope(Session *s, bool force) { |
4afd3348 | 746 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; |
20263082 | 747 | int r; |
20263082 LP |
748 | |
749 | assert(s); | |
750 | ||
fb6becb4 LP |
751 | if (!s->scope) |
752 | return 0; | |
9b221b63 | 753 | |
756ed0e2 | 754 | /* Let's always abandon the scope first. This tells systemd that we are not interested anymore, and everything |
629ff674 | 755 | * that is left in the scope is "left-over". Informing systemd about this has the benefit that it will log |
756ed0e2 LP |
756 | * when killing any processes left after this point. */ |
757 | r = manager_abandon_scope(s->manager, s->scope, &error); | |
25a1ab4e | 758 | if (r < 0) { |
756ed0e2 | 759 | log_warning_errno(r, "Failed to abandon session scope, ignoring: %s", bus_error_message(&error, r)); |
25a1ab4e LP |
760 | sd_bus_error_free(&error); |
761 | } | |
762 | ||
763 | s->scope_job = mfree(s->scope_job); | |
756ed0e2 LP |
764 | |
765 | /* Optionally, let's kill everything that's left now. */ | |
156a3637 LP |
766 | if (force || |
767 | (s->user->user_record->kill_processes != 0 && | |
768 | (s->user->user_record->kill_processes > 0 || | |
769 | manager_shall_kill(s->manager, s->user->user_record->user_name)))) { | |
801a884d | 770 | |
1a42ce09 | 771 | r = manager_stop_unit(s->manager, s->scope, force ? "replace" : "fail", &error, &s->scope_job); |
25a1ab4e LP |
772 | if (r < 0) { |
773 | if (force) | |
774 | return log_error_errno(r, "Failed to stop session scope: %s", bus_error_message(&error, r)); | |
20263082 | 775 | |
25a1ab4e LP |
776 | log_warning_errno(r, "Failed to stop session scope, ignoring: %s", bus_error_message(&error, r)); |
777 | } | |
8150acb1 | 778 | } else { |
20263082 | 779 | |
8150acb1 AJ |
780 | /* With no killing, this session is allowed to persist in "closing" state indefinitely. |
781 | * Therefore session stop and session removal may be two distinct events. | |
782 | * Session stop is quite significant on its own, let's log it. */ | |
783 | log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO, | |
784 | "SESSION_ID=%s", s->id, | |
22c902fa | 785 | "USER_ID=%s", s->user->user_record->user_name, |
8150acb1 | 786 | "LEADER="PID_FMT, s->leader, |
f4cf1d66 | 787 | LOG_MESSAGE("Session %s logged out. Waiting for processes to exit.", s->id)); |
8150acb1 AJ |
788 | } |
789 | ||
9b221b63 | 790 | return 0; |
20263082 LP |
791 | } |
792 | ||
9bb69af4 | 793 | int session_stop(Session *s, bool force) { |
405e0255 LP |
794 | int r; |
795 | ||
796 | assert(s); | |
797 | ||
25a1ab4e LP |
798 | /* This is called whenever we begin with tearing down a session record. It's called in four cases: explicit API |
799 | * request via the bus (either directly for the session object or for the seat or user object this session | |
800 | * belongs to; 'force' is true), or due to automatic GC (i.e. scope vanished; 'force' is false), or because the | |
801 | * session FIFO saw an EOF ('force' is false), or because the release timer hit ('force' is false). */ | |
802 | ||
405e0255 LP |
803 | if (!s->user) |
804 | return -ESTALE; | |
25a1ab4e LP |
805 | if (!s->started) |
806 | return 0; | |
807 | if (s->stopping) | |
808 | return 0; | |
405e0255 | 809 | |
5f41d1f1 LP |
810 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
811 | ||
10189fd6 DH |
812 | if (s->seat) |
813 | seat_evict_position(s->seat, s); | |
814 | ||
5f41d1f1 LP |
815 | /* We are going down, don't care about FIFOs anymore */ |
816 | session_remove_fifo(s); | |
817 | ||
405e0255 | 818 | /* Kill cgroup */ |
9bb69af4 | 819 | r = session_stop_scope(s, force); |
405e0255 | 820 | |
5f41d1f1 LP |
821 | s->stopping = true; |
822 | ||
952d3260 LP |
823 | user_elect_display(s->user); |
824 | ||
405e0255 | 825 | session_save(s); |
cc377381 | 826 | user_save(s->user); |
405e0255 LP |
827 | |
828 | return r; | |
829 | } | |
830 | ||
831 | int session_finalize(Session *s) { | |
118ecf32 | 832 | SessionDevice *sd; |
20263082 LP |
833 | |
834 | assert(s); | |
835 | ||
9444b1f2 LP |
836 | if (!s->user) |
837 | return -ESTALE; | |
838 | ||
ed18b08b | 839 | if (s->started) |
d9eb81f9 | 840 | log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO, |
2b044526 | 841 | "MESSAGE_ID=" SD_MESSAGE_SESSION_STOP_STR, |
877d54e9 | 842 | "SESSION_ID=%s", s->id, |
22c902fa | 843 | "USER_ID=%s", s->user->user_record->user_name, |
de0671ee | 844 | "LEADER="PID_FMT, s->leader, |
a1230ff9 | 845 | LOG_MESSAGE("Removed session %s.", s->id)); |
98a28fef | 846 | |
5f41d1f1 LP |
847 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
848 | ||
10189fd6 DH |
849 | if (s->seat) |
850 | seat_evict_position(s->seat, s); | |
851 | ||
118ecf32 DH |
852 | /* Kill session devices */ |
853 | while ((sd = hashmap_first(s->devices))) | |
854 | session_device_free(sd); | |
855 | ||
491ac9f2 | 856 | (void) unlink(s->state_file); |
d2f92cdf | 857 | session_add_to_gc_queue(s); |
ed18b08b | 858 | user_add_to_gc_queue(s->user); |
14c3baca | 859 | |
405e0255 | 860 | if (s->started) { |
ed18b08b | 861 | session_send_signal(s, false); |
405e0255 LP |
862 | s->started = false; |
863 | } | |
50fb9793 | 864 | |
9418f147 LP |
865 | if (s->seat) { |
866 | if (s->seat->active == s) | |
867 | seat_set_active(s->seat, NULL); | |
868 | ||
23bd3b62 | 869 | seat_save(s->seat); |
9418f147 LP |
870 | } |
871 | ||
23bd3b62 | 872 | user_save(s->user); |
7d049e30 | 873 | user_send_changed(s->user, "Display", NULL); |
9418f147 | 874 | |
491ac9f2 | 875 | return 0; |
20263082 LP |
876 | } |
877 | ||
5f41d1f1 LP |
878 | static int release_timeout_callback(sd_event_source *es, uint64_t usec, void *userdata) { |
879 | Session *s = userdata; | |
880 | ||
881 | assert(es); | |
882 | assert(s); | |
883 | ||
bda62573 | 884 | session_stop(s, /* force = */ false); |
5f41d1f1 LP |
885 | return 0; |
886 | } | |
887 | ||
ad8780c9 | 888 | int session_release(Session *s) { |
5f41d1f1 LP |
889 | assert(s); |
890 | ||
891 | if (!s->started || s->stopping) | |
ad8780c9 ZJS |
892 | return 0; |
893 | ||
894 | if (s->timer_event_source) | |
895 | return 0; | |
896 | ||
39cf0351 LP |
897 | return sd_event_add_time_relative( |
898 | s->manager->event, | |
899 | &s->timer_event_source, | |
900 | CLOCK_MONOTONIC, | |
901 | RELEASE_USEC, 0, | |
902 | release_timeout_callback, s); | |
5f41d1f1 LP |
903 | } |
904 | ||
20263082 LP |
905 | bool session_is_active(Session *s) { |
906 | assert(s); | |
907 | ||
908 | if (!s->seat) | |
909 | return true; | |
910 | ||
911 | return s->seat->active == s; | |
912 | } | |
913 | ||
23406ce5 LP |
914 | static int get_tty_atime(const char *tty, usec_t *atime) { |
915 | _cleanup_free_ char *p = NULL; | |
a185c5aa | 916 | struct stat st; |
23406ce5 LP |
917 | |
918 | assert(tty); | |
919 | assert(atime); | |
920 | ||
921 | if (!path_is_absolute(tty)) { | |
b910cc72 | 922 | p = path_join("/dev", tty); |
23406ce5 LP |
923 | if (!p) |
924 | return -ENOMEM; | |
925 | ||
926 | tty = p; | |
927 | } else if (!path_startswith(tty, "/dev/")) | |
928 | return -ENOENT; | |
929 | ||
930 | if (lstat(tty, &st) < 0) | |
931 | return -errno; | |
932 | ||
933 | *atime = timespec_load(&st.st_atim); | |
934 | return 0; | |
935 | } | |
936 | ||
937 | static int get_process_ctty_atime(pid_t pid, usec_t *atime) { | |
938 | _cleanup_free_ char *p = NULL; | |
939 | int r; | |
940 | ||
941 | assert(pid > 0); | |
942 | assert(atime); | |
943 | ||
944 | r = get_ctty(pid, NULL, &p); | |
945 | if (r < 0) | |
946 | return r; | |
947 | ||
948 | return get_tty_atime(p, atime); | |
949 | } | |
950 | ||
951 | int session_get_idle_hint(Session *s, dual_timestamp *t) { | |
be2bb14f | 952 | usec_t atime = 0; |
23406ce5 | 953 | int r; |
a185c5aa LP |
954 | |
955 | assert(s); | |
956 | ||
be2bb14f LP |
957 | /* Graphical sessions have an explicit idle hint */ |
958 | if (SESSION_TYPE_IS_GRAPHICAL(s->type)) { | |
a185c5aa LP |
959 | if (t) |
960 | *t = s->idle_hint_timestamp; | |
961 | ||
962 | return s->idle_hint; | |
963 | } | |
964 | ||
be2bb14f | 965 | /* For sessions with an explicitly configured tty, let's check its atime */ |
23406ce5 LP |
966 | if (s->tty) { |
967 | r = get_tty_atime(s->tty, &atime); | |
968 | if (r >= 0) | |
969 | goto found_atime; | |
970 | } | |
a185c5aa | 971 | |
be2bb14f LP |
972 | /* For sessions with a leader but no explicitly configured tty, let's check the controlling tty of |
973 | * the leader */ | |
238794b1 | 974 | if (pid_is_valid(s->leader)) { |
23406ce5 LP |
975 | r = get_process_ctty_atime(s->leader, &atime); |
976 | if (r >= 0) | |
977 | goto found_atime; | |
a185c5aa LP |
978 | } |
979 | ||
a185c5aa | 980 | if (t) |
be2bb14f | 981 | *t = DUAL_TIMESTAMP_NULL; |
a185c5aa | 982 | |
be2bb14f | 983 | return false; |
23406ce5 LP |
984 | |
985 | found_atime: | |
986 | if (t) | |
987 | dual_timestamp_from_realtime(t, atime); | |
988 | ||
23406ce5 | 989 | if (s->manager->idle_action_usec <= 0) |
be2bb14f | 990 | return false; |
23406ce5 | 991 | |
be2bb14f | 992 | return usec_add(atime, s->manager->idle_action_usec) <= now(CLOCK_REALTIME); |
a185c5aa LP |
993 | } |
994 | ||
be2bb14f | 995 | int session_set_idle_hint(Session *s, bool b) { |
bef422ae LP |
996 | assert(s); |
997 | ||
be2bb14f LP |
998 | if (!SESSION_TYPE_IS_GRAPHICAL(s->type)) |
999 | return -ENOTTY; | |
1000 | ||
bef422ae | 1001 | if (s->idle_hint == b) |
be2bb14f | 1002 | return 0; |
bef422ae LP |
1003 | |
1004 | s->idle_hint = b; | |
1005 | dual_timestamp_get(&s->idle_hint_timestamp); | |
9418f147 | 1006 | |
cc377381 | 1007 | session_send_changed(s, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); |
9418f147 LP |
1008 | |
1009 | if (s->seat) | |
cc377381 LP |
1010 | seat_send_changed(s->seat, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); |
1011 | ||
1012 | user_send_changed(s->user, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); | |
1013 | manager_send_changed(s->manager, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); | |
be2bb14f LP |
1014 | |
1015 | return 1; | |
cc377381 LP |
1016 | } |
1017 | ||
42d35e13 VT |
1018 | int session_get_locked_hint(Session *s) { |
1019 | assert(s); | |
1020 | ||
1021 | return s->locked_hint; | |
1022 | } | |
1023 | ||
1024 | void session_set_locked_hint(Session *s, bool b) { | |
1025 | assert(s); | |
1026 | ||
1027 | if (s->locked_hint == b) | |
1028 | return; | |
1029 | ||
1030 | s->locked_hint = b; | |
1031 | ||
1032 | session_send_changed(s, "LockedHint", NULL); | |
1033 | } | |
1034 | ||
db72aea4 CH |
1035 | void session_set_type(Session *s, SessionType t) { |
1036 | assert(s); | |
1037 | ||
1038 | if (s->type == t) | |
1039 | return; | |
1040 | ||
1041 | s->type = t; | |
1042 | session_save(s); | |
1043 | ||
1044 | session_send_changed(s, "Type", NULL); | |
1045 | } | |
1046 | ||
cc377381 LP |
1047 | static int session_dispatch_fifo(sd_event_source *es, int fd, uint32_t revents, void *userdata) { |
1048 | Session *s = userdata; | |
1049 | ||
1050 | assert(s); | |
1051 | assert(s->fifo_fd == fd); | |
1052 | ||
1053 | /* EOF on the FIFO means the session died abnormally. */ | |
1054 | ||
1055 | session_remove_fifo(s); | |
bda62573 | 1056 | session_stop(s, /* force = */ false); |
cc377381 LP |
1057 | |
1058 | return 1; | |
bef422ae LP |
1059 | } |
1060 | ||
932e3ee7 LP |
1061 | int session_create_fifo(Session *s) { |
1062 | int r; | |
1063 | ||
31b79c2b LP |
1064 | assert(s); |
1065 | ||
b4f78aea | 1066 | /* Create FIFO */ |
932e3ee7 | 1067 | if (!s->fifo_path) { |
37c1d5e9 | 1068 | r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0, MKDIR_WARN_MODE); |
e6061ab2 LP |
1069 | if (r < 0) |
1070 | return r; | |
1071 | ||
d5ddc930 LP |
1072 | s->fifo_path = strjoin("/run/systemd/sessions/", s->id, ".ref"); |
1073 | if (!s->fifo_path) | |
932e3ee7 | 1074 | return -ENOMEM; |
31b79c2b | 1075 | |
932e3ee7 LP |
1076 | if (mkfifo(s->fifo_path, 0600) < 0 && errno != EEXIST) |
1077 | return -errno; | |
1078 | } | |
31b79c2b | 1079 | |
932e3ee7 | 1080 | /* Open reading side */ |
b4f78aea | 1081 | if (s->fifo_fd < 0) { |
db4a47e9 | 1082 | s->fifo_fd = open(s->fifo_path, O_RDONLY|O_CLOEXEC|O_NONBLOCK); |
b4f78aea LP |
1083 | if (s->fifo_fd < 0) |
1084 | return -errno; | |
cc377381 LP |
1085 | } |
1086 | ||
1087 | if (!s->fifo_event_source) { | |
151b9b96 | 1088 | r = sd_event_add_io(s->manager->event, &s->fifo_event_source, s->fifo_fd, 0, session_dispatch_fifo, s); |
b4f78aea LP |
1089 | if (r < 0) |
1090 | return r; | |
1091 | ||
6c75e317 ZJS |
1092 | /* Let's make sure we noticed dead sessions before we process new bus requests (which might |
1093 | * create new sessions). */ | |
e11544a8 | 1094 | r = sd_event_source_set_priority(s->fifo_event_source, SD_EVENT_PRIORITY_NORMAL-10); |
cc377381 LP |
1095 | if (r < 0) |
1096 | return r; | |
b4f78aea | 1097 | } |
932e3ee7 LP |
1098 | |
1099 | /* Open writing side */ | |
db4a47e9 | 1100 | r = open(s->fifo_path, O_WRONLY|O_CLOEXEC|O_NONBLOCK); |
932e3ee7 LP |
1101 | if (r < 0) |
1102 | return -errno; | |
31b79c2b | 1103 | |
932e3ee7 LP |
1104 | return r; |
1105 | } | |
1106 | ||
5f41d1f1 | 1107 | static void session_remove_fifo(Session *s) { |
932e3ee7 LP |
1108 | assert(s); |
1109 | ||
03e334a1 LP |
1110 | s->fifo_event_source = sd_event_source_unref(s->fifo_event_source); |
1111 | s->fifo_fd = safe_close(s->fifo_fd); | |
932e3ee7 LP |
1112 | |
1113 | if (s->fifo_path) { | |
75bbdf47 | 1114 | (void) unlink(s->fifo_path); |
a1e58e8e | 1115 | s->fifo_path = mfree(s->fifo_path); |
932e3ee7 | 1116 | } |
31b79c2b LP |
1117 | } |
1118 | ||
5c093a23 | 1119 | bool session_may_gc(Session *s, bool drop_not_started) { |
bd26aee1 LP |
1120 | int r; |
1121 | ||
20263082 LP |
1122 | assert(s); |
1123 | ||
4a4b033f | 1124 | if (drop_not_started && !s->started) |
5c093a23 | 1125 | return true; |
932e3ee7 | 1126 | |
9444b1f2 | 1127 | if (!s->user) |
5c093a23 | 1128 | return true; |
9444b1f2 | 1129 | |
932e3ee7 | 1130 | if (s->fifo_fd >= 0) { |
5f41d1f1 | 1131 | if (pipe_eof(s->fifo_fd) <= 0) |
5c093a23 | 1132 | return false; |
20263082 LP |
1133 | } |
1134 | ||
bd26aee1 LP |
1135 | if (s->scope_job) { |
1136 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; | |
1137 | ||
1138 | r = manager_job_is_active(s->manager, s->scope_job, &error); | |
1139 | if (r < 0) | |
1140 | log_debug_errno(r, "Failed to determine whether job '%s' is pending, ignoring: %s", s->scope_job, bus_error_message(&error, r)); | |
1141 | if (r != 0) | |
1142 | return false; | |
1143 | } | |
20263082 | 1144 | |
bd26aee1 LP |
1145 | if (s->scope) { |
1146 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; | |
1147 | ||
1148 | r = manager_unit_is_active(s->manager, s->scope, &error); | |
1149 | if (r < 0) | |
1150 | log_debug_errno(r, "Failed to determine whether unit '%s' is active, ignoring: %s", s->scope, bus_error_message(&error, r)); | |
1151 | if (r != 0) | |
1152 | return false; | |
1153 | } | |
20263082 | 1154 | |
5c093a23 | 1155 | return true; |
20263082 LP |
1156 | } |
1157 | ||
14c3baca LP |
1158 | void session_add_to_gc_queue(Session *s) { |
1159 | assert(s); | |
1160 | ||
1161 | if (s->in_gc_queue) | |
1162 | return; | |
1163 | ||
71fda00f | 1164 | LIST_PREPEND(gc_queue, s->manager->session_gc_queue, s); |
14c3baca LP |
1165 | s->in_gc_queue = true; |
1166 | } | |
1167 | ||
0604381b LP |
1168 | SessionState session_get_state(Session *s) { |
1169 | assert(s); | |
1170 | ||
8fe63cd4 | 1171 | /* always check closing first */ |
5f41d1f1 LP |
1172 | if (s->stopping || s->timer_event_source) |
1173 | return SESSION_CLOSING; | |
1174 | ||
8fe63cd4 | 1175 | if (s->scope_job || s->fifo_fd < 0) |
405e0255 | 1176 | return SESSION_OPENING; |
fb6becb4 | 1177 | |
0604381b LP |
1178 | if (session_is_active(s)) |
1179 | return SESSION_ACTIVE; | |
1180 | ||
1181 | return SESSION_ONLINE; | |
1182 | } | |
1183 | ||
de07ab16 | 1184 | int session_kill(Session *s, KillWho who, int signo) { |
de07ab16 LP |
1185 | assert(s); |
1186 | ||
fb6becb4 | 1187 | if (!s->scope) |
de07ab16 LP |
1188 | return -ESRCH; |
1189 | ||
fb6becb4 | 1190 | return manager_kill_unit(s->manager, s->scope, who, signo, NULL); |
de07ab16 LP |
1191 | } |
1192 | ||
90a18413 | 1193 | static int session_open_vt(Session *s) { |
5f41d1f1 | 1194 | char path[sizeof("/dev/tty") + DECIMAL_STR_MAX(s->vtnr)]; |
90a18413 | 1195 | |
baccf3e4 OB |
1196 | if (s->vtnr < 1) |
1197 | return -ENODEV; | |
90a18413 DH |
1198 | |
1199 | if (s->vtfd >= 0) | |
1200 | return s->vtfd; | |
1201 | ||
92bd5ff3 | 1202 | sprintf(path, "/dev/tty%u", s->vtnr); |
22356953 | 1203 | s->vtfd = open_terminal(path, O_RDWR | O_CLOEXEC | O_NONBLOCK | O_NOCTTY); |
4a62c710 | 1204 | if (s->vtfd < 0) |
709f6e46 | 1205 | return log_error_errno(s->vtfd, "cannot open VT %s of session %s: %m", path, s->id); |
90a18413 DH |
1206 | |
1207 | return s->vtfd; | |
1208 | } | |
1209 | ||
a03cdb17 | 1210 | static int session_prepare_vt(Session *s) { |
90a18413 | 1211 | int vt, r; |
9fb2c8b8 | 1212 | struct vt_mode mode = {}; |
90a18413 | 1213 | |
baccf3e4 OB |
1214 | if (s->vtnr < 1) |
1215 | return 0; | |
1216 | ||
90a18413 DH |
1217 | vt = session_open_vt(s); |
1218 | if (vt < 0) | |
baccf3e4 | 1219 | return vt; |
90a18413 | 1220 | |
22c902fa | 1221 | r = fchown(vt, s->user->user_record->uid, -1); |
baccf3e4 | 1222 | if (r < 0) { |
94c156cd LP |
1223 | r = log_error_errno(errno, |
1224 | "Cannot change owner of /dev/tty%u: %m", | |
1225 | s->vtnr); | |
d6176c6c | 1226 | goto error; |
baccf3e4 | 1227 | } |
d6176c6c | 1228 | |
90a18413 | 1229 | r = ioctl(vt, KDSKBMODE, K_OFF); |
baccf3e4 | 1230 | if (r < 0) { |
94c156cd LP |
1231 | r = log_error_errno(errno, |
1232 | "Cannot set K_OFF on /dev/tty%u: %m", | |
1233 | s->vtnr); | |
90a18413 | 1234 | goto error; |
baccf3e4 | 1235 | } |
90a18413 DH |
1236 | |
1237 | r = ioctl(vt, KDSETMODE, KD_GRAPHICS); | |
baccf3e4 | 1238 | if (r < 0) { |
94c156cd LP |
1239 | r = log_error_errno(errno, |
1240 | "Cannot set KD_GRAPHICS on /dev/tty%u: %m", | |
1241 | s->vtnr); | |
90a18413 | 1242 | goto error; |
baccf3e4 | 1243 | } |
90a18413 | 1244 | |
90a18413 DH |
1245 | /* Oh, thanks to the VT layer, VT_AUTO does not work with KD_GRAPHICS. |
1246 | * So we need a dummy handler here which just acknowledges *all* VT | |
1247 | * switch requests. */ | |
1248 | mode.mode = VT_PROCESS; | |
92683ad2 DH |
1249 | mode.relsig = SIGRTMIN; |
1250 | mode.acqsig = SIGRTMIN + 1; | |
90a18413 | 1251 | r = ioctl(vt, VT_SETMODE, &mode); |
baccf3e4 | 1252 | if (r < 0) { |
94c156cd LP |
1253 | r = log_error_errno(errno, |
1254 | "Cannot set VT_PROCESS on /dev/tty%u: %m", | |
1255 | s->vtnr); | |
90a18413 | 1256 | goto error; |
baccf3e4 | 1257 | } |
90a18413 | 1258 | |
baccf3e4 | 1259 | return 0; |
90a18413 DH |
1260 | |
1261 | error: | |
90a18413 | 1262 | session_restore_vt(s); |
baccf3e4 | 1263 | return r; |
90a18413 DH |
1264 | } |
1265 | ||
0212126c | 1266 | static void session_restore_vt(Session *s) { |
8246905a | 1267 | int r; |
128df4cf | 1268 | |
8246905a FB |
1269 | r = vt_restore(s->vtfd); |
1270 | if (r == -EIO) { | |
1271 | int vt, old_fd; | |
ad96887a | 1272 | |
8246905a FB |
1273 | /* It might happen if the controlling process exited before or while we were |
1274 | * restoring the VT as it would leave the old file-descriptor in a hung-up | |
1275 | * state. In this case let's retry with a fresh handle to the virtual terminal. */ | |
ad96887a | 1276 | |
8246905a FB |
1277 | /* We do a little dance to avoid having the terminal be available |
1278 | * for reuse before we've cleaned it up. */ | |
1279 | old_fd = TAKE_FD(s->vtfd); | |
1280 | ||
1281 | vt = session_open_vt(s); | |
1282 | safe_close(old_fd); | |
1283 | ||
1284 | if (vt >= 0) | |
1285 | r = vt_restore(vt); | |
1286 | } | |
ad96887a | 1287 | |
c0f34168 FB |
1288 | if (r < 0) |
1289 | log_warning_errno(r, "Failed to restore VT, ignoring: %m"); | |
d6176c6c | 1290 | |
03e334a1 | 1291 | s->vtfd = safe_close(s->vtfd); |
90a18413 DH |
1292 | } |
1293 | ||
2ec3ff66 | 1294 | void session_leave_vt(Session *s) { |
ce540a24 DH |
1295 | int r; |
1296 | ||
2ec3ff66 DH |
1297 | assert(s); |
1298 | ||
1299 | /* This is called whenever we get a VT-switch signal from the kernel. | |
1300 | * We acknowledge all of them unconditionally. Note that session are | |
1301 | * free to overwrite those handlers and we only register them for | |
1302 | * sessions with controllers. Legacy sessions are not affected. | |
1303 | * However, if we switch from a non-legacy to a legacy session, we must | |
1304 | * make sure to pause all device before acknowledging the switch. We | |
1305 | * process the real switch only after we are notified via sysfs, so the | |
1306 | * legacy session might have already started using the devices. If we | |
1307 | * don't pause the devices before the switch, we might confuse the | |
1308 | * session we switch to. */ | |
1309 | ||
1310 | if (s->vtfd < 0) | |
1311 | return; | |
1312 | ||
1313 | session_device_pause_all(s); | |
27dafac9 | 1314 | r = vt_release(s->vtfd, false); |
ce540a24 | 1315 | if (r < 0) |
27dafac9 | 1316 | log_debug_errno(r, "Cannot release VT of session %s: %m", s->id); |
2ec3ff66 DH |
1317 | } |
1318 | ||
cc377381 | 1319 | bool session_is_controller(Session *s, const char *sender) { |
ae5e06bd DH |
1320 | assert(s); |
1321 | ||
1322 | return streq_ptr(s->controller, sender); | |
1323 | } | |
1324 | ||
b12e5615 | 1325 | static void session_release_controller(Session *s, bool notify) { |
d7ac0952 | 1326 | _unused_ _cleanup_free_ char *name = NULL; |
6d33772f DH |
1327 | SessionDevice *sd; |
1328 | ||
b12e5615 DH |
1329 | if (!s->controller) |
1330 | return; | |
6d33772f | 1331 | |
b12e5615 | 1332 | name = s->controller; |
90a18413 | 1333 | |
6c75e317 ZJS |
1334 | /* By resetting the controller before releasing the devices, we won't send notification signals. |
1335 | * This avoids sending useless notifications if the controller is released on disconnects. */ | |
b12e5615 DH |
1336 | if (!notify) |
1337 | s->controller = NULL; | |
6d33772f | 1338 | |
b12e5615 DH |
1339 | while ((sd = hashmap_first(s->devices))) |
1340 | session_device_free(sd); | |
1341 | ||
1342 | s->controller = NULL; | |
3cde9e8f DM |
1343 | s->track = sd_bus_track_unref(s->track); |
1344 | } | |
1345 | ||
1346 | static int on_bus_track(sd_bus_track *track, void *userdata) { | |
1347 | Session *s = userdata; | |
1348 | ||
1349 | assert(track); | |
1350 | assert(s); | |
1351 | ||
1352 | session_drop_controller(s); | |
1353 | ||
1354 | return 0; | |
6d33772f DH |
1355 | } |
1356 | ||
dc6284e9 | 1357 | int session_set_controller(Session *s, const char *sender, bool force, bool prepare) { |
b12e5615 | 1358 | _cleanup_free_ char *name = NULL; |
ae5e06bd DH |
1359 | int r; |
1360 | ||
1361 | assert(s); | |
1362 | assert(sender); | |
1363 | ||
1364 | if (session_is_controller(s, sender)) | |
1365 | return 0; | |
1366 | if (s->controller && !force) | |
1367 | return -EBUSY; | |
1368 | ||
b12e5615 DH |
1369 | name = strdup(sender); |
1370 | if (!name) | |
ae5e06bd DH |
1371 | return -ENOMEM; |
1372 | ||
3cde9e8f DM |
1373 | s->track = sd_bus_track_unref(s->track); |
1374 | r = sd_bus_track_new(s->manager->bus, &s->track, on_bus_track, s); | |
1375 | if (r < 0) | |
1376 | return r; | |
1377 | ||
1378 | r = sd_bus_track_add_name(s->track, name); | |
1379 | if (r < 0) | |
ae5e06bd | 1380 | return r; |
ae5e06bd | 1381 | |
90a18413 DH |
1382 | /* When setting a session controller, we forcibly mute the VT and set |
1383 | * it into graphics-mode. Applications can override that by changing | |
1384 | * VT state after calling TakeControl(). However, this serves as a good | |
1385 | * default and well-behaving controllers can now ignore VTs entirely. | |
1386 | * Note that we reset the VT on ReleaseControl() and if the controller | |
1387 | * exits. | |
1388 | * If logind crashes/restarts, we restore the controller during restart | |
dc6284e9 FB |
1389 | * (without preparing the VT since the controller has probably overridden |
1390 | * VT state by now) or reset the VT in case it crashed/exited, too. */ | |
1391 | if (prepare) { | |
1392 | r = session_prepare_vt(s); | |
1393 | if (r < 0) { | |
1394 | s->track = sd_bus_track_unref(s->track); | |
1395 | return r; | |
1396 | } | |
13f493dc | 1397 | } |
baccf3e4 | 1398 | |
b12e5615 | 1399 | session_release_controller(s, true); |
ae2a15bc | 1400 | s->controller = TAKE_PTR(name); |
b12e5615 | 1401 | session_save(s); |
90a18413 | 1402 | |
ae5e06bd DH |
1403 | return 0; |
1404 | } | |
1405 | ||
1406 | void session_drop_controller(Session *s) { | |
1407 | assert(s); | |
1408 | ||
1409 | if (!s->controller) | |
1410 | return; | |
1411 | ||
3cde9e8f | 1412 | s->track = sd_bus_track_unref(s->track); |
db72aea4 | 1413 | session_set_type(s, s->original_type); |
b12e5615 DH |
1414 | session_release_controller(s, false); |
1415 | session_save(s); | |
1416 | session_restore_vt(s); | |
ae5e06bd DH |
1417 | } |
1418 | ||
fb6becb4 LP |
1419 | static const char* const session_state_table[_SESSION_STATE_MAX] = { |
1420 | [SESSION_OPENING] = "opening", | |
6c75e317 ZJS |
1421 | [SESSION_ONLINE] = "online", |
1422 | [SESSION_ACTIVE] = "active", | |
1423 | [SESSION_CLOSING] = "closing", | |
0604381b LP |
1424 | }; |
1425 | ||
1426 | DEFINE_STRING_TABLE_LOOKUP(session_state, SessionState); | |
1427 | ||
20263082 | 1428 | static const char* const session_type_table[_SESSION_TYPE_MAX] = { |
2c5859af | 1429 | [SESSION_UNSPECIFIED] = "unspecified", |
6c75e317 ZJS |
1430 | [SESSION_TTY] = "tty", |
1431 | [SESSION_X11] = "x11", | |
1432 | [SESSION_WAYLAND] = "wayland", | |
1433 | [SESSION_MIR] = "mir", | |
1434 | [SESSION_WEB] = "web", | |
20263082 LP |
1435 | }; |
1436 | ||
1437 | DEFINE_STRING_TABLE_LOOKUP(session_type, SessionType); | |
de07ab16 | 1438 | |
55efac6c | 1439 | static const char* const session_class_table[_SESSION_CLASS_MAX] = { |
6c75e317 ZJS |
1440 | [SESSION_USER] = "user", |
1441 | [SESSION_GREETER] = "greeter", | |
e2acb67b | 1442 | [SESSION_LOCK_SCREEN] = "lock-screen", |
6c75e317 | 1443 | [SESSION_BACKGROUND] = "background", |
55efac6c LP |
1444 | }; |
1445 | ||
1446 | DEFINE_STRING_TABLE_LOOKUP(session_class, SessionClass); | |
1447 | ||
de07ab16 LP |
1448 | static const char* const kill_who_table[_KILL_WHO_MAX] = { |
1449 | [KILL_LEADER] = "leader", | |
6c75e317 | 1450 | [KILL_ALL] = "all", |
de07ab16 LP |
1451 | }; |
1452 | ||
1453 | DEFINE_STRING_TABLE_LOOKUP(kill_who, KillWho); | |
3d0ef5c7 LP |
1454 | |
1455 | static const char* const tty_validity_table[_TTY_VALIDITY_MAX] = { | |
6c75e317 ZJS |
1456 | [TTY_FROM_PAM] = "from-pam", |
1457 | [TTY_FROM_UTMP] = "from-utmp", | |
3d0ef5c7 LP |
1458 | [TTY_UTMP_INCONSISTENT] = "utmp-inconsistent", |
1459 | }; | |
1460 | ||
1461 | DEFINE_STRING_TABLE_LOOKUP(tty_validity, TTYValidity); |