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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" |
35cd0ba5 | 29 | #include "mkdir-label.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); |
f647962d MS |
448 | if (r < 0) |
449 | return log_error_errno(r, "Failed to read %s: %m", s->state_file); | |
9444b1f2 LP |
450 | |
451 | if (!s->user) { | |
452 | uid_t u; | |
453 | User *user; | |
454 | ||
baaa35ad ZJS |
455 | if (!uid) |
456 | return log_error_errno(SYNTHETIC_ERRNO(ENOENT), | |
457 | "UID not specified for session %s", | |
458 | s->id); | |
9444b1f2 LP |
459 | |
460 | r = parse_uid(uid, &u); | |
461 | if (r < 0) { | |
462 | log_error("Failed to parse UID value %s for session %s.", uid, s->id); | |
463 | return r; | |
464 | } | |
465 | ||
8cb4ab00 | 466 | user = hashmap_get(s->manager->users, UID_TO_PTR(u)); |
baaa35ad ZJS |
467 | if (!user) |
468 | return log_error_errno(SYNTHETIC_ERRNO(ENOENT), | |
469 | "User of session %s not known.", | |
470 | s->id); | |
9444b1f2 LP |
471 | |
472 | session_set_user(s, user); | |
473 | } | |
a185c5aa LP |
474 | |
475 | if (remote) { | |
476 | k = parse_boolean(remote); | |
477 | if (k >= 0) | |
478 | s->remote = k; | |
479 | } | |
480 | ||
c506027a DH |
481 | if (vtnr) |
482 | safe_atou(vtnr, &s->vtnr); | |
483 | ||
9418f147 | 484 | if (seat && !s->seat) { |
a185c5aa LP |
485 | Seat *o; |
486 | ||
487 | o = hashmap_get(s->manager->seats, seat); | |
488 | if (o) | |
c506027a DH |
489 | r = seat_attach_session(o, s); |
490 | if (!o || r < 0) | |
491 | log_error("Cannot attach session %s to seat %s", s->id, seat); | |
a185c5aa LP |
492 | } |
493 | ||
c506027a DH |
494 | if (!s->seat || !seat_has_vts(s->seat)) |
495 | s->vtnr = 0; | |
a185c5aa | 496 | |
e6494a07 | 497 | if (position && s->seat) { |
14cb109d | 498 | unsigned npos; |
49e6fdbf | 499 | |
e6494a07 | 500 | safe_atou(position, &npos); |
49e6fdbf DH |
501 | seat_claim_position(s->seat, s, npos); |
502 | } | |
503 | ||
3d0ef5c7 LP |
504 | if (tty_validity) { |
505 | TTYValidity v; | |
506 | ||
507 | v = tty_validity_from_string(tty_validity); | |
508 | if (v < 0) | |
509 | log_debug("Failed to parse TTY validity: %s", tty_validity); | |
510 | else | |
511 | s->tty_validity = v; | |
512 | } | |
513 | ||
a185c5aa | 514 | if (leader) { |
238794b1 LP |
515 | pid_t pid; |
516 | ||
517 | r = parse_pid(leader, &pid); | |
518 | if (r < 0) | |
519 | log_debug_errno(r, "Failed to parse leader PID of session: %s", leader); | |
520 | else { | |
521 | r = session_set_leader(s, pid); | |
522 | if (r < 0) | |
523 | log_warning_errno(r, "Failed to set session leader PID, ignoring: %m"); | |
524 | } | |
a185c5aa LP |
525 | } |
526 | ||
a91e4e53 LP |
527 | if (type) { |
528 | SessionType t; | |
529 | ||
530 | t = session_type_from_string(type); | |
531 | if (t >= 0) | |
532 | s->type = t; | |
533 | } | |
534 | ||
db72aea4 CH |
535 | if (original_type) { |
536 | SessionType ot; | |
537 | ||
538 | ot = session_type_from_string(original_type); | |
539 | if (ot >= 0) | |
540 | s->original_type = ot; | |
541 | } else | |
542 | /* Pre-v246 compat: initialize original_type if not set in the state file */ | |
543 | s->original_type = s->type; | |
544 | ||
55efac6c LP |
545 | if (class) { |
546 | SessionClass c; | |
547 | ||
548 | c = session_class_from_string(class); | |
549 | if (c >= 0) | |
550 | s->class = c; | |
551 | } | |
552 | ||
be94d954 MP |
553 | if (state && streq(state, "closing")) |
554 | s->stopping = true; | |
555 | ||
b4f78aea LP |
556 | if (s->fifo_path) { |
557 | int fd; | |
558 | ||
559 | /* If we open an unopened pipe for reading we will not | |
560 | get an EOF. to trigger an EOF we hence open it for | |
be94d954 MP |
561 | writing, but close it right away which then will |
562 | trigger the EOF. This will happen immediately if no | |
563 | other process has the FIFO open for writing, i. e. | |
564 | when the session died before logind (re)started. */ | |
b4f78aea LP |
565 | |
566 | fd = session_create_fifo(s); | |
03e334a1 | 567 | safe_close(fd); |
b4f78aea LP |
568 | } |
569 | ||
b895a735 | 570 | if (realtime) |
d68c645b | 571 | (void) deserialize_usec(realtime, &s->timestamp.realtime); |
b895a735 | 572 | if (monotonic) |
d68c645b | 573 | (void) deserialize_usec(monotonic, &s->timestamp.monotonic); |
a185c5aa | 574 | |
aed24c4c FB |
575 | if (active) { |
576 | k = parse_boolean(active); | |
577 | if (k >= 0) | |
578 | s->was_active = k; | |
579 | } | |
580 | ||
1c8280fd LP |
581 | if (is_display) { |
582 | /* Note that when enumerating users are loaded before sessions, hence the display session to use is | |
583 | * something we have to store along with the session and not the user, as in that case we couldn't | |
584 | * apply it at the time we load the user. */ | |
585 | ||
586 | k = parse_boolean(is_display); | |
587 | if (k < 0) | |
588 | log_warning_errno(k, "Failed to parse IS_DISPLAY session property: %m"); | |
589 | else if (k > 0) | |
590 | s->user->display = s; | |
591 | } | |
592 | ||
6d33772f | 593 | if (controller) { |
aed24c4c | 594 | if (bus_name_has_owner(s->manager->bus, controller, NULL) > 0) { |
dc6284e9 | 595 | session_set_controller(s, controller, false, false); |
aed24c4c FB |
596 | session_load_devices(s, devices); |
597 | } else | |
90a18413 | 598 | session_restore_vt(s); |
6d33772f DH |
599 | } |
600 | ||
a185c5aa | 601 | return r; |
20263082 LP |
602 | } |
603 | ||
604 | int session_activate(Session *s) { | |
14cb109d | 605 | unsigned num_pending; |
d7bd01b5 | 606 | |
20263082 | 607 | assert(s); |
9444b1f2 | 608 | assert(s->user); |
20263082 | 609 | |
20263082 | 610 | if (!s->seat) |
15411c0c | 611 | return -EOPNOTSUPP; |
20263082 LP |
612 | |
613 | if (s->seat->active == s) | |
614 | return 0; | |
615 | ||
d7bd01b5 DH |
616 | /* on seats with VTs, we let VTs manage session-switching */ |
617 | if (seat_has_vts(s->seat)) { | |
709d0587 | 618 | if (s->vtnr == 0) |
15411c0c | 619 | return -EOPNOTSUPP; |
d7bd01b5 DH |
620 | |
621 | return chvt(s->vtnr); | |
622 | } | |
623 | ||
624 | /* On seats without VTs, we implement session-switching in logind. We | |
625 | * try to pause all session-devices and wait until the session | |
626 | * controller acknowledged them. Once all devices are asleep, we simply | |
627 | * switch the active session and be done. | |
628 | * We save the session we want to switch to in seat->pending_switch and | |
629 | * seat_complete_switch() will perform the final switch. */ | |
630 | ||
631 | s->seat->pending_switch = s; | |
632 | ||
633 | /* if no devices are running, immediately perform the session switch */ | |
634 | num_pending = session_device_try_pause_all(s); | |
635 | if (!num_pending) | |
636 | seat_complete_switch(s->seat); | |
20263082 | 637 | |
d7bd01b5 | 638 | return 0; |
20263082 LP |
639 | } |
640 | ||
25a1ab4e | 641 | static int session_start_scope(Session *s, sd_bus_message *properties, sd_bus_error *error) { |
98a28fef LP |
642 | int r; |
643 | ||
644 | assert(s); | |
9444b1f2 | 645 | assert(s->user); |
98a28fef | 646 | |
fb6becb4 | 647 | if (!s->scope) { |
fb2367ed | 648 | _cleanup_free_ char *scope = NULL; |
90558f31 | 649 | const char *description; |
405e0255 | 650 | |
25a1ab4e LP |
651 | s->scope_job = mfree(s->scope_job); |
652 | ||
605405c6 | 653 | scope = strjoin("session-", s->id, ".scope"); |
d0af76e6 | 654 | if (!scope) |
ae018d9b LP |
655 | return log_oom(); |
656 | ||
0a59216c | 657 | description = strjoina("Session ", s->id, " of User ", s->user->user_record->user_name); |
90558f31 LP |
658 | |
659 | r = manager_start_scope( | |
660 | s->manager, | |
661 | scope, | |
662 | s->leader, | |
663 | s->user->slice, | |
664 | description, | |
124d7cb2 ZJS |
665 | /* These two have StopWhenUnneeded= set, hence add a dep towards them */ |
666 | STRV_MAKE(s->user->runtime_dir_service, | |
667 | s->user->service), | |
668 | /* And order us after some more */ | |
669 | STRV_MAKE("systemd-logind.service", | |
670 | "systemd-user-sessions.service", | |
671 | s->user->runtime_dir_service, | |
672 | s->user->service), | |
22c902fa | 673 | user_record_home_directory(s->user->user_record), |
22f93314 | 674 | properties, |
25a1ab4e LP |
675 | error, |
676 | &s->scope_job); | |
fb2367ed | 677 | if (r < 0) |
124d7cb2 ZJS |
678 | return log_error_errno(r, "Failed to start session scope %s: %s", |
679 | scope, bus_error_message(error, r)); | |
fb2367ed YW |
680 | |
681 | s->scope = TAKE_PTR(scope); | |
20263082 LP |
682 | } |
683 | ||
124d7cb2 | 684 | (void) hashmap_put(s->manager->session_units, s->scope, s); |
d0af76e6 | 685 | |
20263082 LP |
686 | return 0; |
687 | } | |
688 | ||
25a1ab4e | 689 | int session_start(Session *s, sd_bus_message *properties, sd_bus_error *error) { |
20263082 LP |
690 | int r; |
691 | ||
692 | assert(s); | |
9444b1f2 LP |
693 | |
694 | if (!s->user) | |
695 | return -ESTALE; | |
20263082 | 696 | |
25a1ab4e LP |
697 | if (s->stopping) |
698 | return -EINVAL; | |
699 | ||
9418f147 LP |
700 | if (s->started) |
701 | return 0; | |
702 | ||
ed18b08b LP |
703 | r = user_start(s->user); |
704 | if (r < 0) | |
705 | return r; | |
706 | ||
25a1ab4e | 707 | r = session_start_scope(s, properties, error); |
fb6becb4 LP |
708 | if (r < 0) |
709 | return r; | |
710 | ||
d9eb81f9 | 711 | log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO, |
2b044526 | 712 | "MESSAGE_ID=" SD_MESSAGE_SESSION_START_STR, |
877d54e9 | 713 | "SESSION_ID=%s", s->id, |
22c902fa | 714 | "USER_ID=%s", s->user->user_record->user_name, |
de0671ee | 715 | "LEADER="PID_FMT, s->leader, |
22c902fa | 716 | LOG_MESSAGE("New session %s of user %s.", s->id, s->user->user_record->user_name)); |
98a28fef | 717 | |
9444b1f2 LP |
718 | if (!dual_timestamp_is_set(&s->timestamp)) |
719 | dual_timestamp_get(&s->timestamp); | |
14c3baca | 720 | |
e9816c48 LP |
721 | if (s->seat) |
722 | seat_read_active_vt(s->seat); | |
723 | ||
9418f147 LP |
724 | s->started = true; |
725 | ||
952d3260 LP |
726 | user_elect_display(s->user); |
727 | ||
5f41d1f1 | 728 | /* Save data */ |
e9816c48 | 729 | session_save(s); |
7f7bb946 | 730 | user_save(s->user); |
5f41d1f1 LP |
731 | if (s->seat) |
732 | seat_save(s->seat); | |
e9816c48 | 733 | |
5f41d1f1 | 734 | /* Send signals */ |
da119395 | 735 | session_send_signal(s, true); |
7d049e30 | 736 | user_send_changed(s->user, "Display", NULL); |
40771cf5 LP |
737 | |
738 | if (s->seat && s->seat->active == s) | |
739 | seat_send_changed(s->seat, "ActiveSession", NULL); | |
9418f147 | 740 | |
20263082 LP |
741 | return 0; |
742 | } | |
743 | ||
9bb69af4 | 744 | static int session_stop_scope(Session *s, bool force) { |
4afd3348 | 745 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; |
20263082 | 746 | int r; |
20263082 LP |
747 | |
748 | assert(s); | |
749 | ||
fb6becb4 LP |
750 | if (!s->scope) |
751 | return 0; | |
9b221b63 | 752 | |
756ed0e2 | 753 | /* Let's always abandon the scope first. This tells systemd that we are not interested anymore, and everything |
629ff674 | 754 | * that is left in the scope is "left-over". Informing systemd about this has the benefit that it will log |
756ed0e2 LP |
755 | * when killing any processes left after this point. */ |
756 | r = manager_abandon_scope(s->manager, s->scope, &error); | |
25a1ab4e | 757 | if (r < 0) { |
756ed0e2 | 758 | log_warning_errno(r, "Failed to abandon session scope, ignoring: %s", bus_error_message(&error, r)); |
25a1ab4e LP |
759 | sd_bus_error_free(&error); |
760 | } | |
761 | ||
762 | s->scope_job = mfree(s->scope_job); | |
756ed0e2 LP |
763 | |
764 | /* Optionally, let's kill everything that's left now. */ | |
156a3637 LP |
765 | if (force || |
766 | (s->user->user_record->kill_processes != 0 && | |
767 | (s->user->user_record->kill_processes > 0 || | |
768 | manager_shall_kill(s->manager, s->user->user_record->user_name)))) { | |
801a884d | 769 | |
1a42ce09 | 770 | r = manager_stop_unit(s->manager, s->scope, force ? "replace" : "fail", &error, &s->scope_job); |
25a1ab4e LP |
771 | if (r < 0) { |
772 | if (force) | |
773 | return log_error_errno(r, "Failed to stop session scope: %s", bus_error_message(&error, r)); | |
20263082 | 774 | |
25a1ab4e LP |
775 | log_warning_errno(r, "Failed to stop session scope, ignoring: %s", bus_error_message(&error, r)); |
776 | } | |
8150acb1 | 777 | } else { |
20263082 | 778 | |
8150acb1 AJ |
779 | /* With no killing, this session is allowed to persist in "closing" state indefinitely. |
780 | * Therefore session stop and session removal may be two distinct events. | |
781 | * Session stop is quite significant on its own, let's log it. */ | |
782 | log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO, | |
783 | "SESSION_ID=%s", s->id, | |
22c902fa | 784 | "USER_ID=%s", s->user->user_record->user_name, |
8150acb1 | 785 | "LEADER="PID_FMT, s->leader, |
f4cf1d66 | 786 | LOG_MESSAGE("Session %s logged out. Waiting for processes to exit.", s->id)); |
8150acb1 AJ |
787 | } |
788 | ||
9b221b63 | 789 | return 0; |
20263082 LP |
790 | } |
791 | ||
9bb69af4 | 792 | int session_stop(Session *s, bool force) { |
405e0255 LP |
793 | int r; |
794 | ||
795 | assert(s); | |
796 | ||
25a1ab4e LP |
797 | /* This is called whenever we begin with tearing down a session record. It's called in four cases: explicit API |
798 | * request via the bus (either directly for the session object or for the seat or user object this session | |
799 | * belongs to; 'force' is true), or due to automatic GC (i.e. scope vanished; 'force' is false), or because the | |
800 | * session FIFO saw an EOF ('force' is false), or because the release timer hit ('force' is false). */ | |
801 | ||
405e0255 LP |
802 | if (!s->user) |
803 | return -ESTALE; | |
25a1ab4e LP |
804 | if (!s->started) |
805 | return 0; | |
806 | if (s->stopping) | |
807 | return 0; | |
405e0255 | 808 | |
5f41d1f1 LP |
809 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
810 | ||
10189fd6 DH |
811 | if (s->seat) |
812 | seat_evict_position(s->seat, s); | |
813 | ||
5f41d1f1 LP |
814 | /* We are going down, don't care about FIFOs anymore */ |
815 | session_remove_fifo(s); | |
816 | ||
405e0255 | 817 | /* Kill cgroup */ |
9bb69af4 | 818 | r = session_stop_scope(s, force); |
405e0255 | 819 | |
5f41d1f1 LP |
820 | s->stopping = true; |
821 | ||
952d3260 LP |
822 | user_elect_display(s->user); |
823 | ||
405e0255 | 824 | session_save(s); |
cc377381 | 825 | user_save(s->user); |
405e0255 LP |
826 | |
827 | return r; | |
828 | } | |
829 | ||
830 | int session_finalize(Session *s) { | |
118ecf32 | 831 | SessionDevice *sd; |
20263082 LP |
832 | |
833 | assert(s); | |
834 | ||
9444b1f2 LP |
835 | if (!s->user) |
836 | return -ESTALE; | |
837 | ||
ed18b08b | 838 | if (s->started) |
d9eb81f9 | 839 | log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO, |
2b044526 | 840 | "MESSAGE_ID=" SD_MESSAGE_SESSION_STOP_STR, |
877d54e9 | 841 | "SESSION_ID=%s", s->id, |
22c902fa | 842 | "USER_ID=%s", s->user->user_record->user_name, |
de0671ee | 843 | "LEADER="PID_FMT, s->leader, |
a1230ff9 | 844 | LOG_MESSAGE("Removed session %s.", s->id)); |
98a28fef | 845 | |
5f41d1f1 LP |
846 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
847 | ||
10189fd6 DH |
848 | if (s->seat) |
849 | seat_evict_position(s->seat, s); | |
850 | ||
118ecf32 DH |
851 | /* Kill session devices */ |
852 | while ((sd = hashmap_first(s->devices))) | |
853 | session_device_free(sd); | |
854 | ||
491ac9f2 | 855 | (void) unlink(s->state_file); |
d2f92cdf | 856 | session_add_to_gc_queue(s); |
ed18b08b | 857 | user_add_to_gc_queue(s->user); |
14c3baca | 858 | |
405e0255 | 859 | if (s->started) { |
ed18b08b | 860 | session_send_signal(s, false); |
405e0255 LP |
861 | s->started = false; |
862 | } | |
50fb9793 | 863 | |
9418f147 LP |
864 | if (s->seat) { |
865 | if (s->seat->active == s) | |
866 | seat_set_active(s->seat, NULL); | |
867 | ||
23bd3b62 | 868 | seat_save(s->seat); |
9418f147 LP |
869 | } |
870 | ||
23bd3b62 | 871 | user_save(s->user); |
7d049e30 | 872 | user_send_changed(s->user, "Display", NULL); |
9418f147 | 873 | |
491ac9f2 | 874 | return 0; |
20263082 LP |
875 | } |
876 | ||
5f41d1f1 LP |
877 | static int release_timeout_callback(sd_event_source *es, uint64_t usec, void *userdata) { |
878 | Session *s = userdata; | |
879 | ||
880 | assert(es); | |
881 | assert(s); | |
882 | ||
bda62573 | 883 | session_stop(s, /* force = */ false); |
5f41d1f1 LP |
884 | return 0; |
885 | } | |
886 | ||
ad8780c9 | 887 | int session_release(Session *s) { |
5f41d1f1 LP |
888 | assert(s); |
889 | ||
890 | if (!s->started || s->stopping) | |
ad8780c9 ZJS |
891 | return 0; |
892 | ||
893 | if (s->timer_event_source) | |
894 | return 0; | |
895 | ||
39cf0351 LP |
896 | return sd_event_add_time_relative( |
897 | s->manager->event, | |
898 | &s->timer_event_source, | |
899 | CLOCK_MONOTONIC, | |
900 | RELEASE_USEC, 0, | |
901 | release_timeout_callback, s); | |
5f41d1f1 LP |
902 | } |
903 | ||
20263082 LP |
904 | bool session_is_active(Session *s) { |
905 | assert(s); | |
906 | ||
907 | if (!s->seat) | |
908 | return true; | |
909 | ||
910 | return s->seat->active == s; | |
911 | } | |
912 | ||
23406ce5 LP |
913 | static int get_tty_atime(const char *tty, usec_t *atime) { |
914 | _cleanup_free_ char *p = NULL; | |
a185c5aa | 915 | struct stat st; |
23406ce5 LP |
916 | |
917 | assert(tty); | |
918 | assert(atime); | |
919 | ||
920 | if (!path_is_absolute(tty)) { | |
b910cc72 | 921 | p = path_join("/dev", tty); |
23406ce5 LP |
922 | if (!p) |
923 | return -ENOMEM; | |
924 | ||
925 | tty = p; | |
926 | } else if (!path_startswith(tty, "/dev/")) | |
927 | return -ENOENT; | |
928 | ||
929 | if (lstat(tty, &st) < 0) | |
930 | return -errno; | |
931 | ||
932 | *atime = timespec_load(&st.st_atim); | |
933 | return 0; | |
934 | } | |
935 | ||
936 | static int get_process_ctty_atime(pid_t pid, usec_t *atime) { | |
937 | _cleanup_free_ char *p = NULL; | |
938 | int r; | |
939 | ||
940 | assert(pid > 0); | |
941 | assert(atime); | |
942 | ||
943 | r = get_ctty(pid, NULL, &p); | |
944 | if (r < 0) | |
945 | return r; | |
946 | ||
947 | return get_tty_atime(p, atime); | |
948 | } | |
949 | ||
950 | int session_get_idle_hint(Session *s, dual_timestamp *t) { | |
be2bb14f | 951 | usec_t atime = 0; |
23406ce5 | 952 | int r; |
a185c5aa LP |
953 | |
954 | assert(s); | |
955 | ||
be2bb14f LP |
956 | /* Graphical sessions have an explicit idle hint */ |
957 | if (SESSION_TYPE_IS_GRAPHICAL(s->type)) { | |
a185c5aa LP |
958 | if (t) |
959 | *t = s->idle_hint_timestamp; | |
960 | ||
961 | return s->idle_hint; | |
962 | } | |
963 | ||
be2bb14f | 964 | /* For sessions with an explicitly configured tty, let's check its atime */ |
23406ce5 LP |
965 | if (s->tty) { |
966 | r = get_tty_atime(s->tty, &atime); | |
967 | if (r >= 0) | |
968 | goto found_atime; | |
969 | } | |
a185c5aa | 970 | |
be2bb14f LP |
971 | /* For sessions with a leader but no explicitly configured tty, let's check the controlling tty of |
972 | * the leader */ | |
238794b1 | 973 | if (pid_is_valid(s->leader)) { |
23406ce5 LP |
974 | r = get_process_ctty_atime(s->leader, &atime); |
975 | if (r >= 0) | |
976 | goto found_atime; | |
a185c5aa LP |
977 | } |
978 | ||
a185c5aa | 979 | if (t) |
be2bb14f | 980 | *t = DUAL_TIMESTAMP_NULL; |
a185c5aa | 981 | |
be2bb14f | 982 | return false; |
23406ce5 LP |
983 | |
984 | found_atime: | |
985 | if (t) | |
986 | dual_timestamp_from_realtime(t, atime); | |
987 | ||
23406ce5 | 988 | if (s->manager->idle_action_usec <= 0) |
be2bb14f | 989 | return false; |
23406ce5 | 990 | |
be2bb14f | 991 | return usec_add(atime, s->manager->idle_action_usec) <= now(CLOCK_REALTIME); |
a185c5aa LP |
992 | } |
993 | ||
be2bb14f | 994 | int session_set_idle_hint(Session *s, bool b) { |
bef422ae LP |
995 | assert(s); |
996 | ||
be2bb14f LP |
997 | if (!SESSION_TYPE_IS_GRAPHICAL(s->type)) |
998 | return -ENOTTY; | |
999 | ||
bef422ae | 1000 | if (s->idle_hint == b) |
be2bb14f | 1001 | return 0; |
bef422ae LP |
1002 | |
1003 | s->idle_hint = b; | |
1004 | dual_timestamp_get(&s->idle_hint_timestamp); | |
9418f147 | 1005 | |
cc377381 | 1006 | session_send_changed(s, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); |
9418f147 LP |
1007 | |
1008 | if (s->seat) | |
cc377381 LP |
1009 | seat_send_changed(s->seat, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); |
1010 | ||
1011 | user_send_changed(s->user, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); | |
1012 | manager_send_changed(s->manager, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); | |
be2bb14f LP |
1013 | |
1014 | return 1; | |
cc377381 LP |
1015 | } |
1016 | ||
42d35e13 VT |
1017 | int session_get_locked_hint(Session *s) { |
1018 | assert(s); | |
1019 | ||
1020 | return s->locked_hint; | |
1021 | } | |
1022 | ||
1023 | void session_set_locked_hint(Session *s, bool b) { | |
1024 | assert(s); | |
1025 | ||
1026 | if (s->locked_hint == b) | |
1027 | return; | |
1028 | ||
1029 | s->locked_hint = b; | |
1030 | ||
1031 | session_send_changed(s, "LockedHint", NULL); | |
1032 | } | |
1033 | ||
db72aea4 CH |
1034 | void session_set_type(Session *s, SessionType t) { |
1035 | assert(s); | |
1036 | ||
1037 | if (s->type == t) | |
1038 | return; | |
1039 | ||
1040 | s->type = t; | |
1041 | session_save(s); | |
1042 | ||
1043 | session_send_changed(s, "Type", NULL); | |
1044 | } | |
1045 | ||
cc377381 LP |
1046 | static int session_dispatch_fifo(sd_event_source *es, int fd, uint32_t revents, void *userdata) { |
1047 | Session *s = userdata; | |
1048 | ||
1049 | assert(s); | |
1050 | assert(s->fifo_fd == fd); | |
1051 | ||
1052 | /* EOF on the FIFO means the session died abnormally. */ | |
1053 | ||
1054 | session_remove_fifo(s); | |
bda62573 | 1055 | session_stop(s, /* force = */ false); |
cc377381 LP |
1056 | |
1057 | return 1; | |
bef422ae LP |
1058 | } |
1059 | ||
932e3ee7 LP |
1060 | int session_create_fifo(Session *s) { |
1061 | int r; | |
1062 | ||
31b79c2b LP |
1063 | assert(s); |
1064 | ||
b4f78aea | 1065 | /* Create FIFO */ |
932e3ee7 | 1066 | if (!s->fifo_path) { |
37c1d5e9 | 1067 | r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0, MKDIR_WARN_MODE); |
e6061ab2 LP |
1068 | if (r < 0) |
1069 | return r; | |
1070 | ||
d5ddc930 LP |
1071 | s->fifo_path = strjoin("/run/systemd/sessions/", s->id, ".ref"); |
1072 | if (!s->fifo_path) | |
932e3ee7 | 1073 | return -ENOMEM; |
31b79c2b | 1074 | |
932e3ee7 LP |
1075 | if (mkfifo(s->fifo_path, 0600) < 0 && errno != EEXIST) |
1076 | return -errno; | |
1077 | } | |
31b79c2b | 1078 | |
932e3ee7 | 1079 | /* Open reading side */ |
b4f78aea | 1080 | if (s->fifo_fd < 0) { |
db4a47e9 | 1081 | s->fifo_fd = open(s->fifo_path, O_RDONLY|O_CLOEXEC|O_NONBLOCK); |
b4f78aea LP |
1082 | if (s->fifo_fd < 0) |
1083 | return -errno; | |
cc377381 LP |
1084 | } |
1085 | ||
1086 | if (!s->fifo_event_source) { | |
151b9b96 | 1087 | r = sd_event_add_io(s->manager->event, &s->fifo_event_source, s->fifo_fd, 0, session_dispatch_fifo, s); |
b4f78aea LP |
1088 | if (r < 0) |
1089 | return r; | |
1090 | ||
6c75e317 ZJS |
1091 | /* Let's make sure we noticed dead sessions before we process new bus requests (which might |
1092 | * create new sessions). */ | |
e11544a8 | 1093 | r = sd_event_source_set_priority(s->fifo_event_source, SD_EVENT_PRIORITY_NORMAL-10); |
cc377381 LP |
1094 | if (r < 0) |
1095 | return r; | |
b4f78aea | 1096 | } |
932e3ee7 LP |
1097 | |
1098 | /* Open writing side */ | |
7c248223 | 1099 | return RET_NERRNO(open(s->fifo_path, O_WRONLY|O_CLOEXEC|O_NONBLOCK)); |
932e3ee7 LP |
1100 | } |
1101 | ||
5f41d1f1 | 1102 | static void session_remove_fifo(Session *s) { |
932e3ee7 LP |
1103 | assert(s); |
1104 | ||
03e334a1 LP |
1105 | s->fifo_event_source = sd_event_source_unref(s->fifo_event_source); |
1106 | s->fifo_fd = safe_close(s->fifo_fd); | |
932e3ee7 LP |
1107 | |
1108 | if (s->fifo_path) { | |
75bbdf47 | 1109 | (void) unlink(s->fifo_path); |
a1e58e8e | 1110 | s->fifo_path = mfree(s->fifo_path); |
932e3ee7 | 1111 | } |
31b79c2b LP |
1112 | } |
1113 | ||
5c093a23 | 1114 | bool session_may_gc(Session *s, bool drop_not_started) { |
bd26aee1 LP |
1115 | int r; |
1116 | ||
20263082 LP |
1117 | assert(s); |
1118 | ||
4a4b033f | 1119 | if (drop_not_started && !s->started) |
5c093a23 | 1120 | return true; |
932e3ee7 | 1121 | |
9444b1f2 | 1122 | if (!s->user) |
5c093a23 | 1123 | return true; |
9444b1f2 | 1124 | |
932e3ee7 | 1125 | if (s->fifo_fd >= 0) { |
5f41d1f1 | 1126 | if (pipe_eof(s->fifo_fd) <= 0) |
5c093a23 | 1127 | return false; |
20263082 LP |
1128 | } |
1129 | ||
bd26aee1 LP |
1130 | if (s->scope_job) { |
1131 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; | |
1132 | ||
1133 | r = manager_job_is_active(s->manager, s->scope_job, &error); | |
1134 | if (r < 0) | |
1135 | log_debug_errno(r, "Failed to determine whether job '%s' is pending, ignoring: %s", s->scope_job, bus_error_message(&error, r)); | |
1136 | if (r != 0) | |
1137 | return false; | |
1138 | } | |
20263082 | 1139 | |
bd26aee1 LP |
1140 | if (s->scope) { |
1141 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; | |
1142 | ||
1143 | r = manager_unit_is_active(s->manager, s->scope, &error); | |
1144 | if (r < 0) | |
1145 | log_debug_errno(r, "Failed to determine whether unit '%s' is active, ignoring: %s", s->scope, bus_error_message(&error, r)); | |
1146 | if (r != 0) | |
1147 | return false; | |
1148 | } | |
20263082 | 1149 | |
5c093a23 | 1150 | return true; |
20263082 LP |
1151 | } |
1152 | ||
14c3baca LP |
1153 | void session_add_to_gc_queue(Session *s) { |
1154 | assert(s); | |
1155 | ||
1156 | if (s->in_gc_queue) | |
1157 | return; | |
1158 | ||
71fda00f | 1159 | LIST_PREPEND(gc_queue, s->manager->session_gc_queue, s); |
14c3baca LP |
1160 | s->in_gc_queue = true; |
1161 | } | |
1162 | ||
0604381b LP |
1163 | SessionState session_get_state(Session *s) { |
1164 | assert(s); | |
1165 | ||
8fe63cd4 | 1166 | /* always check closing first */ |
5f41d1f1 LP |
1167 | if (s->stopping || s->timer_event_source) |
1168 | return SESSION_CLOSING; | |
1169 | ||
8fe63cd4 | 1170 | if (s->scope_job || s->fifo_fd < 0) |
405e0255 | 1171 | return SESSION_OPENING; |
fb6becb4 | 1172 | |
0604381b LP |
1173 | if (session_is_active(s)) |
1174 | return SESSION_ACTIVE; | |
1175 | ||
1176 | return SESSION_ONLINE; | |
1177 | } | |
1178 | ||
de07ab16 | 1179 | int session_kill(Session *s, KillWho who, int signo) { |
de07ab16 LP |
1180 | assert(s); |
1181 | ||
fb6becb4 | 1182 | if (!s->scope) |
de07ab16 LP |
1183 | return -ESRCH; |
1184 | ||
fb6becb4 | 1185 | return manager_kill_unit(s->manager, s->scope, who, signo, NULL); |
de07ab16 LP |
1186 | } |
1187 | ||
90a18413 | 1188 | static int session_open_vt(Session *s) { |
5f41d1f1 | 1189 | char path[sizeof("/dev/tty") + DECIMAL_STR_MAX(s->vtnr)]; |
90a18413 | 1190 | |
baccf3e4 OB |
1191 | if (s->vtnr < 1) |
1192 | return -ENODEV; | |
90a18413 DH |
1193 | |
1194 | if (s->vtfd >= 0) | |
1195 | return s->vtfd; | |
1196 | ||
92bd5ff3 | 1197 | sprintf(path, "/dev/tty%u", s->vtnr); |
22356953 | 1198 | s->vtfd = open_terminal(path, O_RDWR | O_CLOEXEC | O_NONBLOCK | O_NOCTTY); |
4a62c710 | 1199 | if (s->vtfd < 0) |
709f6e46 | 1200 | return log_error_errno(s->vtfd, "cannot open VT %s of session %s: %m", path, s->id); |
90a18413 DH |
1201 | |
1202 | return s->vtfd; | |
1203 | } | |
1204 | ||
a03cdb17 | 1205 | static int session_prepare_vt(Session *s) { |
90a18413 | 1206 | int vt, r; |
9fb2c8b8 | 1207 | struct vt_mode mode = {}; |
90a18413 | 1208 | |
baccf3e4 OB |
1209 | if (s->vtnr < 1) |
1210 | return 0; | |
1211 | ||
90a18413 DH |
1212 | vt = session_open_vt(s); |
1213 | if (vt < 0) | |
baccf3e4 | 1214 | return vt; |
90a18413 | 1215 | |
22c902fa | 1216 | r = fchown(vt, s->user->user_record->uid, -1); |
baccf3e4 | 1217 | if (r < 0) { |
94c156cd LP |
1218 | r = log_error_errno(errno, |
1219 | "Cannot change owner of /dev/tty%u: %m", | |
1220 | s->vtnr); | |
d6176c6c | 1221 | goto error; |
baccf3e4 | 1222 | } |
d6176c6c | 1223 | |
90a18413 | 1224 | r = ioctl(vt, KDSKBMODE, K_OFF); |
baccf3e4 | 1225 | if (r < 0) { |
94c156cd LP |
1226 | r = log_error_errno(errno, |
1227 | "Cannot set K_OFF on /dev/tty%u: %m", | |
1228 | s->vtnr); | |
90a18413 | 1229 | goto error; |
baccf3e4 | 1230 | } |
90a18413 DH |
1231 | |
1232 | r = ioctl(vt, KDSETMODE, KD_GRAPHICS); | |
baccf3e4 | 1233 | if (r < 0) { |
94c156cd LP |
1234 | r = log_error_errno(errno, |
1235 | "Cannot set KD_GRAPHICS on /dev/tty%u: %m", | |
1236 | s->vtnr); | |
90a18413 | 1237 | goto error; |
baccf3e4 | 1238 | } |
90a18413 | 1239 | |
90a18413 DH |
1240 | /* Oh, thanks to the VT layer, VT_AUTO does not work with KD_GRAPHICS. |
1241 | * So we need a dummy handler here which just acknowledges *all* VT | |
1242 | * switch requests. */ | |
1243 | mode.mode = VT_PROCESS; | |
92683ad2 DH |
1244 | mode.relsig = SIGRTMIN; |
1245 | mode.acqsig = SIGRTMIN + 1; | |
90a18413 | 1246 | r = ioctl(vt, VT_SETMODE, &mode); |
baccf3e4 | 1247 | if (r < 0) { |
94c156cd LP |
1248 | r = log_error_errno(errno, |
1249 | "Cannot set VT_PROCESS on /dev/tty%u: %m", | |
1250 | s->vtnr); | |
90a18413 | 1251 | goto error; |
baccf3e4 | 1252 | } |
90a18413 | 1253 | |
baccf3e4 | 1254 | return 0; |
90a18413 DH |
1255 | |
1256 | error: | |
90a18413 | 1257 | session_restore_vt(s); |
baccf3e4 | 1258 | return r; |
90a18413 DH |
1259 | } |
1260 | ||
0212126c | 1261 | static void session_restore_vt(Session *s) { |
8246905a | 1262 | int r; |
128df4cf | 1263 | |
8246905a FB |
1264 | r = vt_restore(s->vtfd); |
1265 | if (r == -EIO) { | |
1266 | int vt, old_fd; | |
ad96887a | 1267 | |
8246905a FB |
1268 | /* It might happen if the controlling process exited before or while we were |
1269 | * restoring the VT as it would leave the old file-descriptor in a hung-up | |
1270 | * state. In this case let's retry with a fresh handle to the virtual terminal. */ | |
ad96887a | 1271 | |
8246905a FB |
1272 | /* We do a little dance to avoid having the terminal be available |
1273 | * for reuse before we've cleaned it up. */ | |
1274 | old_fd = TAKE_FD(s->vtfd); | |
1275 | ||
1276 | vt = session_open_vt(s); | |
1277 | safe_close(old_fd); | |
1278 | ||
1279 | if (vt >= 0) | |
1280 | r = vt_restore(vt); | |
1281 | } | |
ad96887a | 1282 | |
c0f34168 FB |
1283 | if (r < 0) |
1284 | log_warning_errno(r, "Failed to restore VT, ignoring: %m"); | |
d6176c6c | 1285 | |
03e334a1 | 1286 | s->vtfd = safe_close(s->vtfd); |
90a18413 DH |
1287 | } |
1288 | ||
2ec3ff66 | 1289 | void session_leave_vt(Session *s) { |
ce540a24 DH |
1290 | int r; |
1291 | ||
2ec3ff66 DH |
1292 | assert(s); |
1293 | ||
1294 | /* This is called whenever we get a VT-switch signal from the kernel. | |
1295 | * We acknowledge all of them unconditionally. Note that session are | |
1296 | * free to overwrite those handlers and we only register them for | |
1297 | * sessions with controllers. Legacy sessions are not affected. | |
1298 | * However, if we switch from a non-legacy to a legacy session, we must | |
1299 | * make sure to pause all device before acknowledging the switch. We | |
1300 | * process the real switch only after we are notified via sysfs, so the | |
1301 | * legacy session might have already started using the devices. If we | |
1302 | * don't pause the devices before the switch, we might confuse the | |
1303 | * session we switch to. */ | |
1304 | ||
1305 | if (s->vtfd < 0) | |
1306 | return; | |
1307 | ||
1308 | session_device_pause_all(s); | |
27dafac9 | 1309 | r = vt_release(s->vtfd, false); |
ce540a24 | 1310 | if (r < 0) |
27dafac9 | 1311 | log_debug_errno(r, "Cannot release VT of session %s: %m", s->id); |
2ec3ff66 DH |
1312 | } |
1313 | ||
cc377381 | 1314 | bool session_is_controller(Session *s, const char *sender) { |
ae5e06bd DH |
1315 | assert(s); |
1316 | ||
1317 | return streq_ptr(s->controller, sender); | |
1318 | } | |
1319 | ||
b12e5615 | 1320 | static void session_release_controller(Session *s, bool notify) { |
d7ac0952 | 1321 | _unused_ _cleanup_free_ char *name = NULL; |
6d33772f DH |
1322 | SessionDevice *sd; |
1323 | ||
b12e5615 DH |
1324 | if (!s->controller) |
1325 | return; | |
6d33772f | 1326 | |
b12e5615 | 1327 | name = s->controller; |
90a18413 | 1328 | |
6c75e317 ZJS |
1329 | /* By resetting the controller before releasing the devices, we won't send notification signals. |
1330 | * This avoids sending useless notifications if the controller is released on disconnects. */ | |
b12e5615 DH |
1331 | if (!notify) |
1332 | s->controller = NULL; | |
6d33772f | 1333 | |
b12e5615 DH |
1334 | while ((sd = hashmap_first(s->devices))) |
1335 | session_device_free(sd); | |
1336 | ||
1337 | s->controller = NULL; | |
3cde9e8f DM |
1338 | s->track = sd_bus_track_unref(s->track); |
1339 | } | |
1340 | ||
1341 | static int on_bus_track(sd_bus_track *track, void *userdata) { | |
1342 | Session *s = userdata; | |
1343 | ||
1344 | assert(track); | |
1345 | assert(s); | |
1346 | ||
1347 | session_drop_controller(s); | |
1348 | ||
1349 | return 0; | |
6d33772f DH |
1350 | } |
1351 | ||
dc6284e9 | 1352 | int session_set_controller(Session *s, const char *sender, bool force, bool prepare) { |
b12e5615 | 1353 | _cleanup_free_ char *name = NULL; |
ae5e06bd DH |
1354 | int r; |
1355 | ||
1356 | assert(s); | |
1357 | assert(sender); | |
1358 | ||
1359 | if (session_is_controller(s, sender)) | |
1360 | return 0; | |
1361 | if (s->controller && !force) | |
1362 | return -EBUSY; | |
1363 | ||
b12e5615 DH |
1364 | name = strdup(sender); |
1365 | if (!name) | |
ae5e06bd DH |
1366 | return -ENOMEM; |
1367 | ||
3cde9e8f DM |
1368 | s->track = sd_bus_track_unref(s->track); |
1369 | r = sd_bus_track_new(s->manager->bus, &s->track, on_bus_track, s); | |
1370 | if (r < 0) | |
1371 | return r; | |
1372 | ||
1373 | r = sd_bus_track_add_name(s->track, name); | |
1374 | if (r < 0) | |
ae5e06bd | 1375 | return r; |
ae5e06bd | 1376 | |
90a18413 DH |
1377 | /* When setting a session controller, we forcibly mute the VT and set |
1378 | * it into graphics-mode. Applications can override that by changing | |
1379 | * VT state after calling TakeControl(). However, this serves as a good | |
1380 | * default and well-behaving controllers can now ignore VTs entirely. | |
1381 | * Note that we reset the VT on ReleaseControl() and if the controller | |
1382 | * exits. | |
1383 | * If logind crashes/restarts, we restore the controller during restart | |
dc6284e9 FB |
1384 | * (without preparing the VT since the controller has probably overridden |
1385 | * VT state by now) or reset the VT in case it crashed/exited, too. */ | |
1386 | if (prepare) { | |
1387 | r = session_prepare_vt(s); | |
1388 | if (r < 0) { | |
1389 | s->track = sd_bus_track_unref(s->track); | |
1390 | return r; | |
1391 | } | |
13f493dc | 1392 | } |
baccf3e4 | 1393 | |
b12e5615 | 1394 | session_release_controller(s, true); |
ae2a15bc | 1395 | s->controller = TAKE_PTR(name); |
b12e5615 | 1396 | session_save(s); |
90a18413 | 1397 | |
ae5e06bd DH |
1398 | return 0; |
1399 | } | |
1400 | ||
1401 | void session_drop_controller(Session *s) { | |
1402 | assert(s); | |
1403 | ||
1404 | if (!s->controller) | |
1405 | return; | |
1406 | ||
3cde9e8f | 1407 | s->track = sd_bus_track_unref(s->track); |
db72aea4 | 1408 | session_set_type(s, s->original_type); |
b12e5615 DH |
1409 | session_release_controller(s, false); |
1410 | session_save(s); | |
1411 | session_restore_vt(s); | |
ae5e06bd DH |
1412 | } |
1413 | ||
fb6becb4 LP |
1414 | static const char* const session_state_table[_SESSION_STATE_MAX] = { |
1415 | [SESSION_OPENING] = "opening", | |
6c75e317 ZJS |
1416 | [SESSION_ONLINE] = "online", |
1417 | [SESSION_ACTIVE] = "active", | |
1418 | [SESSION_CLOSING] = "closing", | |
0604381b LP |
1419 | }; |
1420 | ||
1421 | DEFINE_STRING_TABLE_LOOKUP(session_state, SessionState); | |
1422 | ||
20263082 | 1423 | static const char* const session_type_table[_SESSION_TYPE_MAX] = { |
2c5859af | 1424 | [SESSION_UNSPECIFIED] = "unspecified", |
6c75e317 ZJS |
1425 | [SESSION_TTY] = "tty", |
1426 | [SESSION_X11] = "x11", | |
1427 | [SESSION_WAYLAND] = "wayland", | |
1428 | [SESSION_MIR] = "mir", | |
1429 | [SESSION_WEB] = "web", | |
20263082 LP |
1430 | }; |
1431 | ||
1432 | DEFINE_STRING_TABLE_LOOKUP(session_type, SessionType); | |
de07ab16 | 1433 | |
55efac6c | 1434 | static const char* const session_class_table[_SESSION_CLASS_MAX] = { |
6c75e317 ZJS |
1435 | [SESSION_USER] = "user", |
1436 | [SESSION_GREETER] = "greeter", | |
e2acb67b | 1437 | [SESSION_LOCK_SCREEN] = "lock-screen", |
6c75e317 | 1438 | [SESSION_BACKGROUND] = "background", |
55efac6c LP |
1439 | }; |
1440 | ||
1441 | DEFINE_STRING_TABLE_LOOKUP(session_class, SessionClass); | |
1442 | ||
de07ab16 LP |
1443 | static const char* const kill_who_table[_KILL_WHO_MAX] = { |
1444 | [KILL_LEADER] = "leader", | |
6c75e317 | 1445 | [KILL_ALL] = "all", |
de07ab16 LP |
1446 | }; |
1447 | ||
1448 | DEFINE_STRING_TABLE_LOOKUP(kill_who, KillWho); | |
3d0ef5c7 LP |
1449 | |
1450 | static const char* const tty_validity_table[_TTY_VALIDITY_MAX] = { | |
6c75e317 ZJS |
1451 | [TTY_FROM_PAM] = "from-pam", |
1452 | [TTY_FROM_UTMP] = "from-utmp", | |
3d0ef5c7 LP |
1453 | [TTY_UTMP_INCONSISTENT] = "utmp-inconsistent", |
1454 | }; | |
1455 | ||
1456 | DEFINE_STRING_TABLE_LOOKUP(tty_validity, TTYValidity); |