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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
20263082 LP |
2 | |
3 | #include <errno.h> | |
90a18413 | 4 | #include <fcntl.h> |
90a18413 | 5 | #include <linux/kd.h> |
4f5dd394 | 6 | #include <linux/vt.h> |
90a18413 | 7 | #include <signal.h> |
20263082 | 8 | #include <string.h> |
90a18413 | 9 | #include <sys/ioctl.h> |
ca78ad1d | 10 | #include <sys/stat.h> |
20263082 LP |
11 | #include <unistd.h> |
12 | ||
cc377381 | 13 | #include "sd-messages.h" |
4f5dd394 | 14 | |
b5efdb8a | 15 | #include "alloc-util.h" |
430f0182 | 16 | #include "audit-util.h" |
cc377381 | 17 | #include "bus-error.h" |
4f5dd394 | 18 | #include "bus-util.h" |
686d13b9 | 19 | #include "env-file.h" |
4f5dd394 | 20 | #include "escape.h" |
3ffd4af2 | 21 | #include "fd-util.h" |
4f5dd394 | 22 | #include "fileio.h" |
f97b34a6 | 23 | #include "format-util.h" |
c004493c | 24 | #include "io-util.h" |
6ecda0fb LP |
25 | #include "logind-dbus.h" |
26 | #include "logind-seat-dbus.h" | |
27 | #include "logind-session-dbus.h" | |
3ffd4af2 | 28 | #include "logind-session.h" |
6ecda0fb | 29 | #include "logind-user-dbus.h" |
4f5dd394 | 30 | #include "mkdir.h" |
6bedfcbb | 31 | #include "parse-util.h" |
4f5dd394 | 32 | #include "path-util.h" |
8c29a457 | 33 | #include "process-util.h" |
d68c645b | 34 | #include "serialize.h" |
8b43440b | 35 | #include "string-table.h" |
25a1ab4e | 36 | #include "strv.h" |
288a74cc | 37 | #include "terminal-util.h" |
e4de7287 | 38 | #include "tmpfile-util.h" |
b1d4f8e1 | 39 | #include "user-util.h" |
4f5dd394 | 40 | #include "util.h" |
20263082 | 41 | |
5f41d1f1 LP |
42 | #define RELEASE_USEC (20*USEC_PER_SEC) |
43 | ||
44 | static void session_remove_fifo(Session *s); | |
0212126c | 45 | static void session_restore_vt(Session *s); |
5f41d1f1 | 46 | |
8c29a457 LP |
47 | int session_new(Session **ret, Manager *m, const char *id) { |
48 | _cleanup_(session_freep) Session *s = NULL; | |
49 | int r; | |
20263082 | 50 | |
8c29a457 | 51 | assert(ret); |
20263082 LP |
52 | assert(m); |
53 | assert(id); | |
54 | ||
8c29a457 LP |
55 | if (!session_id_valid(id)) |
56 | return -EINVAL; | |
57 | ||
58 | s = new(Session, 1); | |
20263082 | 59 | if (!s) |
8c29a457 LP |
60 | return -ENOMEM; |
61 | ||
62 | *s = (Session) { | |
63 | .manager = m, | |
64 | .fifo_fd = -1, | |
65 | .vtfd = -1, | |
66 | .audit_id = AUDIT_SESSION_INVALID, | |
3d0ef5c7 | 67 | .tty_validity = _TTY_VALIDITY_INVALID, |
8c29a457 | 68 | }; |
20263082 | 69 | |
b910cc72 | 70 | s->state_file = path_join("/run/systemd/sessions", id); |
6b430fdb | 71 | if (!s->state_file) |
8c29a457 | 72 | return -ENOMEM; |
118ecf32 | 73 | |
2b6bf07d | 74 | s->id = basename(s->state_file); |
20263082 | 75 | |
8c29a457 LP |
76 | s->devices = hashmap_new(&devt_hash_ops); |
77 | if (!s->devices) | |
78 | return -ENOMEM; | |
20263082 | 79 | |
8c29a457 LP |
80 | r = hashmap_put(m->sessions, s->id, s); |
81 | if (r < 0) | |
82 | return r; | |
20263082 | 83 | |
8c29a457 LP |
84 | *ret = TAKE_PTR(s); |
85 | return 0; | |
20263082 LP |
86 | } |
87 | ||
8c29a457 | 88 | Session* session_free(Session *s) { |
118ecf32 DH |
89 | SessionDevice *sd; |
90 | ||
8c29a457 LP |
91 | if (!s) |
92 | return NULL; | |
20263082 | 93 | |
14c3baca | 94 | if (s->in_gc_queue) |
71fda00f | 95 | LIST_REMOVE(gc_queue, s->manager->session_gc_queue, s); |
14c3baca | 96 | |
5f41d1f1 LP |
97 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
98 | ||
ae5e06bd DH |
99 | session_drop_controller(s); |
100 | ||
118ecf32 DH |
101 | while ((sd = hashmap_first(s->devices))) |
102 | session_device_free(sd); | |
103 | ||
104 | hashmap_free(s->devices); | |
105 | ||
20263082 | 106 | if (s->user) { |
71fda00f | 107 | LIST_REMOVE(sessions_by_user, s->user->sessions, s); |
20263082 LP |
108 | |
109 | if (s->user->display == s) | |
110 | s->user->display = NULL; | |
9afe9efb LP |
111 | |
112 | user_update_last_session_timer(s->user); | |
20263082 LP |
113 | } |
114 | ||
9418f147 LP |
115 | if (s->seat) { |
116 | if (s->seat->active == s) | |
117 | s->seat->active = NULL; | |
d7bd01b5 DH |
118 | if (s->seat->pending_switch == s) |
119 | s->seat->pending_switch = NULL; | |
9418f147 | 120 | |
49e6fdbf | 121 | seat_evict_position(s->seat, s); |
71fda00f | 122 | LIST_REMOVE(sessions_by_seat, s->seat->sessions, s); |
9418f147 | 123 | } |
20263082 | 124 | |
fb6becb4 LP |
125 | if (s->scope) { |
126 | hashmap_remove(s->manager->session_units, s->scope); | |
127 | free(s->scope); | |
128 | } | |
129 | ||
238794b1 LP |
130 | if (pid_is_valid(s->leader)) |
131 | (void) hashmap_remove_value(s->manager->sessions_by_leader, PID_TO_PTR(s->leader), s); | |
132 | ||
fb6becb4 | 133 | free(s->scope_job); |
1713813d | 134 | |
cc377381 | 135 | sd_bus_message_unref(s->create_message); |
20263082 LP |
136 | |
137 | free(s->tty); | |
138 | free(s->display); | |
139 | free(s->remote_host); | |
3f49d45a | 140 | free(s->remote_user); |
98a28fef | 141 | free(s->service); |
a4cd87e9 | 142 | free(s->desktop); |
20263082 LP |
143 | |
144 | hashmap_remove(s->manager->sessions, s->id); | |
98a28fef | 145 | |
c20b8dad LP |
146 | sd_event_source_unref(s->fifo_event_source); |
147 | safe_close(s->fifo_fd); | |
148 | ||
149 | /* Note that we remove neither the state file nor the fifo path here, since we want both to survive | |
150 | * daemon restarts */ | |
d2f92cdf | 151 | free(s->state_file); |
c20b8dad | 152 | free(s->fifo_path); |
8c29a457 LP |
153 | |
154 | return mfree(s); | |
20263082 LP |
155 | } |
156 | ||
9444b1f2 LP |
157 | void session_set_user(Session *s, User *u) { |
158 | assert(s); | |
159 | assert(!s->user); | |
160 | ||
161 | s->user = u; | |
71fda00f | 162 | LIST_PREPEND(sessions_by_user, u->sessions, s); |
9afe9efb LP |
163 | |
164 | user_update_last_session_timer(u); | |
9444b1f2 LP |
165 | } |
166 | ||
238794b1 LP |
167 | int session_set_leader(Session *s, pid_t pid) { |
168 | int r; | |
169 | ||
170 | assert(s); | |
171 | ||
172 | if (!pid_is_valid(pid)) | |
173 | return -EINVAL; | |
174 | ||
175 | if (s->leader == pid) | |
176 | return 0; | |
177 | ||
178 | r = hashmap_put(s->manager->sessions_by_leader, PID_TO_PTR(pid), s); | |
179 | if (r < 0) | |
180 | return r; | |
181 | ||
182 | if (pid_is_valid(s->leader)) | |
183 | (void) hashmap_remove_value(s->manager->sessions_by_leader, PID_TO_PTR(s->leader), s); | |
184 | ||
185 | s->leader = pid; | |
186 | (void) audit_session_from_pid(pid, &s->audit_id); | |
187 | ||
188 | return 1; | |
189 | } | |
190 | ||
aed24c4c FB |
191 | static void session_save_devices(Session *s, FILE *f) { |
192 | SessionDevice *sd; | |
193 | Iterator i; | |
194 | ||
195 | if (!hashmap_isempty(s->devices)) { | |
196 | fprintf(f, "DEVICES="); | |
197 | HASHMAP_FOREACH(sd, s->devices, i) | |
198 | fprintf(f, "%u:%u ", major(sd->dev), minor(sd->dev)); | |
199 | fprintf(f, "\n"); | |
200 | } | |
201 | } | |
202 | ||
20263082 | 203 | int session_save(Session *s) { |
507f22bd | 204 | _cleanup_free_ char *temp_path = NULL; |
cc377381 | 205 | _cleanup_fclose_ FILE *f = NULL; |
20263082 LP |
206 | int r = 0; |
207 | ||
208 | assert(s); | |
209 | ||
9444b1f2 LP |
210 | if (!s->user) |
211 | return -ESTALE; | |
212 | ||
accaeded LP |
213 | if (!s->started) |
214 | return 0; | |
215 | ||
37c1d5e9 | 216 | r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0, MKDIR_WARN_MODE); |
20263082 | 217 | if (r < 0) |
dacd6cee | 218 | goto fail; |
20263082 | 219 | |
14c3baca LP |
220 | r = fopen_temporary(s->state_file, &f, &temp_path); |
221 | if (r < 0) | |
dacd6cee | 222 | goto fail; |
20263082 | 223 | |
44176400 | 224 | (void) fchmod(fileno(f), 0644); |
14c3baca | 225 | |
20263082 LP |
226 | fprintf(f, |
227 | "# This is private data. Do not parse.\n" | |
90b2de37 | 228 | "UID="UID_FMT"\n" |
20263082 LP |
229 | "USER=%s\n" |
230 | "ACTIVE=%i\n" | |
1c8280fd | 231 | "IS_DISPLAY=%i\n" |
0604381b | 232 | "STATE=%s\n" |
fb6becb4 | 233 | "REMOTE=%i\n", |
90b2de37 | 234 | s->user->uid, |
20263082 LP |
235 | s->user->name, |
236 | session_is_active(s), | |
1c8280fd | 237 | s->user->display == s, |
0604381b | 238 | session_state_to_string(session_get_state(s)), |
fb6becb4 | 239 | s->remote); |
20263082 | 240 | |
a91e4e53 | 241 | if (s->type >= 0) |
507f22bd | 242 | fprintf(f, "TYPE=%s\n", session_type_to_string(s->type)); |
a91e4e53 | 243 | |
55efac6c | 244 | if (s->class >= 0) |
507f22bd | 245 | fprintf(f, "CLASS=%s\n", session_class_to_string(s->class)); |
55efac6c | 246 | |
fb6becb4 LP |
247 | if (s->scope) |
248 | fprintf(f, "SCOPE=%s\n", s->scope); | |
fb6becb4 LP |
249 | if (s->scope_job) |
250 | fprintf(f, "SCOPE_JOB=%s\n", s->scope_job); | |
20263082 | 251 | |
932e3ee7 | 252 | if (s->fifo_path) |
507f22bd | 253 | fprintf(f, "FIFO=%s\n", s->fifo_path); |
932e3ee7 | 254 | |
20263082 | 255 | if (s->seat) |
507f22bd | 256 | fprintf(f, "SEAT=%s\n", s->seat->id); |
20263082 LP |
257 | |
258 | if (s->tty) | |
507f22bd | 259 | fprintf(f, "TTY=%s\n", s->tty); |
20263082 | 260 | |
3d0ef5c7 LP |
261 | if (s->tty_validity >= 0) |
262 | fprintf(f, "TTY_VALIDITY=%s\n", tty_validity_to_string(s->tty_validity)); | |
263 | ||
20263082 | 264 | if (s->display) |
507f22bd | 265 | fprintf(f, "DISPLAY=%s\n", s->display); |
20263082 | 266 | |
558c6490 LP |
267 | if (s->remote_host) { |
268 | _cleanup_free_ char *escaped; | |
269 | ||
270 | escaped = cescape(s->remote_host); | |
271 | if (!escaped) { | |
272 | r = -ENOMEM; | |
dacd6cee | 273 | goto fail; |
558c6490 LP |
274 | } |
275 | ||
276 | fprintf(f, "REMOTE_HOST=%s\n", escaped); | |
277 | } | |
278 | ||
279 | if (s->remote_user) { | |
280 | _cleanup_free_ char *escaped; | |
281 | ||
282 | escaped = cescape(s->remote_user); | |
283 | if (!escaped) { | |
284 | r = -ENOMEM; | |
dacd6cee | 285 | goto fail; |
558c6490 LP |
286 | } |
287 | ||
288 | fprintf(f, "REMOTE_USER=%s\n", escaped); | |
289 | } | |
290 | ||
291 | if (s->service) { | |
292 | _cleanup_free_ char *escaped; | |
20263082 | 293 | |
558c6490 LP |
294 | escaped = cescape(s->service); |
295 | if (!escaped) { | |
296 | r = -ENOMEM; | |
dacd6cee | 297 | goto fail; |
558c6490 LP |
298 | } |
299 | ||
300 | fprintf(f, "SERVICE=%s\n", escaped); | |
301 | } | |
3f49d45a | 302 | |
558c6490 LP |
303 | if (s->desktop) { |
304 | _cleanup_free_ char *escaped; | |
98a28fef | 305 | |
558c6490 LP |
306 | escaped = cescape(s->desktop); |
307 | if (!escaped) { | |
308 | r = -ENOMEM; | |
dacd6cee | 309 | goto fail; |
558c6490 LP |
310 | } |
311 | ||
312 | fprintf(f, "DESKTOP=%s\n", escaped); | |
313 | } | |
a4cd87e9 | 314 | |
bf7825ae | 315 | if (s->seat && seat_has_vts(s->seat)) |
92bd5ff3 | 316 | fprintf(f, "VTNR=%u\n", s->vtnr); |
20263082 | 317 | |
49e6fdbf | 318 | if (!s->vtnr) |
e6494a07 | 319 | fprintf(f, "POSITION=%u\n", s->position); |
49e6fdbf | 320 | |
54191eb3 | 321 | if (pid_is_valid(s->leader)) |
90b2de37 | 322 | fprintf(f, "LEADER="PID_FMT"\n", s->leader); |
20263082 | 323 | |
3a87a86e | 324 | if (audit_session_is_valid(s->audit_id)) |
507f22bd | 325 | fprintf(f, "AUDIT=%"PRIu32"\n", s->audit_id); |
20263082 | 326 | |
9444b1f2 LP |
327 | if (dual_timestamp_is_set(&s->timestamp)) |
328 | fprintf(f, | |
90b2de37 ZJS |
329 | "REALTIME="USEC_FMT"\n" |
330 | "MONOTONIC="USEC_FMT"\n", | |
331 | s->timestamp.realtime, | |
332 | s->timestamp.monotonic); | |
9444b1f2 | 333 | |
aed24c4c | 334 | if (s->controller) { |
6d33772f | 335 | fprintf(f, "CONTROLLER=%s\n", s->controller); |
aed24c4c FB |
336 | session_save_devices(s, f); |
337 | } | |
6d33772f | 338 | |
dacd6cee LP |
339 | r = fflush_and_check(f); |
340 | if (r < 0) | |
341 | goto fail; | |
14c3baca | 342 | |
dacd6cee | 343 | if (rename(temp_path, s->state_file) < 0) { |
20263082 | 344 | r = -errno; |
dacd6cee | 345 | goto fail; |
20263082 LP |
346 | } |
347 | ||
dacd6cee LP |
348 | return 0; |
349 | ||
350 | fail: | |
351 | (void) unlink(s->state_file); | |
14c3baca | 352 | |
dacd6cee LP |
353 | if (temp_path) |
354 | (void) unlink(temp_path); | |
355 | ||
356 | return log_error_errno(r, "Failed to save session data %s: %m", s->state_file); | |
20263082 LP |
357 | } |
358 | ||
aed24c4c FB |
359 | static int session_load_devices(Session *s, const char *devices) { |
360 | const char *p; | |
361 | int r = 0; | |
362 | ||
363 | assert(s); | |
364 | ||
365 | for (p = devices;;) { | |
366 | _cleanup_free_ char *word = NULL; | |
367 | SessionDevice *sd; | |
368 | dev_t dev; | |
369 | int k; | |
370 | ||
371 | k = extract_first_word(&p, &word, NULL, 0); | |
372 | if (k == 0) | |
373 | break; | |
374 | if (k < 0) { | |
375 | r = k; | |
376 | break; | |
377 | } | |
378 | ||
379 | k = parse_dev(word, &dev); | |
380 | if (k < 0) { | |
381 | r = k; | |
382 | continue; | |
383 | } | |
384 | ||
385 | /* The file descriptors for loaded devices will be reattached later. */ | |
386 | k = session_device_new(s, dev, false, &sd); | |
387 | if (k < 0) | |
388 | r = k; | |
389 | } | |
390 | ||
391 | if (r < 0) | |
392 | log_error_errno(r, "Loading session devices for session %s failed: %m", s->id); | |
393 | ||
394 | return r; | |
395 | } | |
dacd6cee | 396 | |
20263082 | 397 | int session_load(Session *s) { |
9444b1f2 | 398 | _cleanup_free_ char *remote = NULL, |
a185c5aa | 399 | *seat = NULL, |
3d0ef5c7 | 400 | *tty_validity = NULL, |
a185c5aa | 401 | *vtnr = NULL, |
be94d954 | 402 | *state = NULL, |
e6494a07 | 403 | *position = NULL, |
a185c5aa | 404 | *leader = NULL, |
55efac6c | 405 | *type = NULL, |
9444b1f2 LP |
406 | *class = NULL, |
407 | *uid = NULL, | |
408 | *realtime = NULL, | |
6d33772f | 409 | *monotonic = NULL, |
aed24c4c FB |
410 | *controller = NULL, |
411 | *active = NULL, | |
1c8280fd LP |
412 | *devices = NULL, |
413 | *is_display = NULL; | |
a185c5aa LP |
414 | |
415 | int k, r; | |
416 | ||
20263082 LP |
417 | assert(s); |
418 | ||
aa8fbc74 | 419 | r = parse_env_file(NULL, s->state_file, |
a185c5aa | 420 | "REMOTE", &remote, |
fb6becb4 LP |
421 | "SCOPE", &s->scope, |
422 | "SCOPE_JOB", &s->scope_job, | |
932e3ee7 | 423 | "FIFO", &s->fifo_path, |
a185c5aa LP |
424 | "SEAT", &seat, |
425 | "TTY", &s->tty, | |
3d0ef5c7 | 426 | "TTY_VALIDITY", &tty_validity, |
a185c5aa LP |
427 | "DISPLAY", &s->display, |
428 | "REMOTE_HOST", &s->remote_host, | |
429 | "REMOTE_USER", &s->remote_user, | |
98a28fef | 430 | "SERVICE", &s->service, |
a4cd87e9 | 431 | "DESKTOP", &s->desktop, |
a185c5aa | 432 | "VTNR", &vtnr, |
be94d954 | 433 | "STATE", &state, |
e6494a07 | 434 | "POSITION", &position, |
a185c5aa | 435 | "LEADER", &leader, |
a91e4e53 | 436 | "TYPE", &type, |
55efac6c | 437 | "CLASS", &class, |
9444b1f2 LP |
438 | "UID", &uid, |
439 | "REALTIME", &realtime, | |
440 | "MONOTONIC", &monotonic, | |
6d33772f | 441 | "CONTROLLER", &controller, |
aed24c4c FB |
442 | "ACTIVE", &active, |
443 | "DEVICES", &devices, | |
13df9c39 | 444 | "IS_DISPLAY", &is_display); |
a185c5aa | 445 | |
f647962d MS |
446 | if (r < 0) |
447 | return log_error_errno(r, "Failed to read %s: %m", s->state_file); | |
9444b1f2 LP |
448 | |
449 | if (!s->user) { | |
450 | uid_t u; | |
451 | User *user; | |
452 | ||
baaa35ad ZJS |
453 | if (!uid) |
454 | return log_error_errno(SYNTHETIC_ERRNO(ENOENT), | |
455 | "UID not specified for session %s", | |
456 | s->id); | |
9444b1f2 LP |
457 | |
458 | r = parse_uid(uid, &u); | |
459 | if (r < 0) { | |
460 | log_error("Failed to parse UID value %s for session %s.", uid, s->id); | |
461 | return r; | |
462 | } | |
463 | ||
8cb4ab00 | 464 | user = hashmap_get(s->manager->users, UID_TO_PTR(u)); |
baaa35ad ZJS |
465 | if (!user) |
466 | return log_error_errno(SYNTHETIC_ERRNO(ENOENT), | |
467 | "User of session %s not known.", | |
468 | s->id); | |
9444b1f2 LP |
469 | |
470 | session_set_user(s, user); | |
471 | } | |
a185c5aa LP |
472 | |
473 | if (remote) { | |
474 | k = parse_boolean(remote); | |
475 | if (k >= 0) | |
476 | s->remote = k; | |
477 | } | |
478 | ||
c506027a DH |
479 | if (vtnr) |
480 | safe_atou(vtnr, &s->vtnr); | |
481 | ||
9418f147 | 482 | if (seat && !s->seat) { |
a185c5aa LP |
483 | Seat *o; |
484 | ||
485 | o = hashmap_get(s->manager->seats, seat); | |
486 | if (o) | |
c506027a DH |
487 | r = seat_attach_session(o, s); |
488 | if (!o || r < 0) | |
489 | log_error("Cannot attach session %s to seat %s", s->id, seat); | |
a185c5aa LP |
490 | } |
491 | ||
c506027a DH |
492 | if (!s->seat || !seat_has_vts(s->seat)) |
493 | s->vtnr = 0; | |
a185c5aa | 494 | |
e6494a07 | 495 | if (position && s->seat) { |
14cb109d | 496 | unsigned npos; |
49e6fdbf | 497 | |
e6494a07 | 498 | safe_atou(position, &npos); |
49e6fdbf DH |
499 | seat_claim_position(s->seat, s, npos); |
500 | } | |
501 | ||
3d0ef5c7 LP |
502 | if (tty_validity) { |
503 | TTYValidity v; | |
504 | ||
505 | v = tty_validity_from_string(tty_validity); | |
506 | if (v < 0) | |
507 | log_debug("Failed to parse TTY validity: %s", tty_validity); | |
508 | else | |
509 | s->tty_validity = v; | |
510 | } | |
511 | ||
a185c5aa | 512 | if (leader) { |
238794b1 LP |
513 | pid_t pid; |
514 | ||
515 | r = parse_pid(leader, &pid); | |
516 | if (r < 0) | |
517 | log_debug_errno(r, "Failed to parse leader PID of session: %s", leader); | |
518 | else { | |
519 | r = session_set_leader(s, pid); | |
520 | if (r < 0) | |
521 | log_warning_errno(r, "Failed to set session leader PID, ignoring: %m"); | |
522 | } | |
a185c5aa LP |
523 | } |
524 | ||
a91e4e53 LP |
525 | if (type) { |
526 | SessionType t; | |
527 | ||
528 | t = session_type_from_string(type); | |
529 | if (t >= 0) | |
530 | s->type = t; | |
531 | } | |
532 | ||
55efac6c LP |
533 | if (class) { |
534 | SessionClass c; | |
535 | ||
536 | c = session_class_from_string(class); | |
537 | if (c >= 0) | |
538 | s->class = c; | |
539 | } | |
540 | ||
be94d954 MP |
541 | if (state && streq(state, "closing")) |
542 | s->stopping = true; | |
543 | ||
b4f78aea LP |
544 | if (s->fifo_path) { |
545 | int fd; | |
546 | ||
547 | /* If we open an unopened pipe for reading we will not | |
548 | get an EOF. to trigger an EOF we hence open it for | |
be94d954 MP |
549 | writing, but close it right away which then will |
550 | trigger the EOF. This will happen immediately if no | |
551 | other process has the FIFO open for writing, i. e. | |
552 | when the session died before logind (re)started. */ | |
b4f78aea LP |
553 | |
554 | fd = session_create_fifo(s); | |
03e334a1 | 555 | safe_close(fd); |
b4f78aea LP |
556 | } |
557 | ||
b895a735 | 558 | if (realtime) |
d68c645b | 559 | (void) deserialize_usec(realtime, &s->timestamp.realtime); |
b895a735 | 560 | if (monotonic) |
d68c645b | 561 | (void) deserialize_usec(monotonic, &s->timestamp.monotonic); |
a185c5aa | 562 | |
aed24c4c FB |
563 | if (active) { |
564 | k = parse_boolean(active); | |
565 | if (k >= 0) | |
566 | s->was_active = k; | |
567 | } | |
568 | ||
1c8280fd LP |
569 | if (is_display) { |
570 | /* Note that when enumerating users are loaded before sessions, hence the display session to use is | |
571 | * something we have to store along with the session and not the user, as in that case we couldn't | |
572 | * apply it at the time we load the user. */ | |
573 | ||
574 | k = parse_boolean(is_display); | |
575 | if (k < 0) | |
576 | log_warning_errno(k, "Failed to parse IS_DISPLAY session property: %m"); | |
577 | else if (k > 0) | |
578 | s->user->display = s; | |
579 | } | |
580 | ||
6d33772f | 581 | if (controller) { |
aed24c4c | 582 | if (bus_name_has_owner(s->manager->bus, controller, NULL) > 0) { |
dc6284e9 | 583 | session_set_controller(s, controller, false, false); |
aed24c4c FB |
584 | session_load_devices(s, devices); |
585 | } else | |
90a18413 | 586 | session_restore_vt(s); |
6d33772f DH |
587 | } |
588 | ||
a185c5aa | 589 | return r; |
20263082 LP |
590 | } |
591 | ||
592 | int session_activate(Session *s) { | |
14cb109d | 593 | unsigned num_pending; |
d7bd01b5 | 594 | |
20263082 | 595 | assert(s); |
9444b1f2 | 596 | assert(s->user); |
20263082 | 597 | |
20263082 | 598 | if (!s->seat) |
15411c0c | 599 | return -EOPNOTSUPP; |
20263082 LP |
600 | |
601 | if (s->seat->active == s) | |
602 | return 0; | |
603 | ||
d7bd01b5 DH |
604 | /* on seats with VTs, we let VTs manage session-switching */ |
605 | if (seat_has_vts(s->seat)) { | |
709d0587 | 606 | if (s->vtnr == 0) |
15411c0c | 607 | return -EOPNOTSUPP; |
d7bd01b5 DH |
608 | |
609 | return chvt(s->vtnr); | |
610 | } | |
611 | ||
612 | /* On seats without VTs, we implement session-switching in logind. We | |
613 | * try to pause all session-devices and wait until the session | |
614 | * controller acknowledged them. Once all devices are asleep, we simply | |
615 | * switch the active session and be done. | |
616 | * We save the session we want to switch to in seat->pending_switch and | |
617 | * seat_complete_switch() will perform the final switch. */ | |
618 | ||
619 | s->seat->pending_switch = s; | |
620 | ||
621 | /* if no devices are running, immediately perform the session switch */ | |
622 | num_pending = session_device_try_pause_all(s); | |
623 | if (!num_pending) | |
624 | seat_complete_switch(s->seat); | |
20263082 | 625 | |
d7bd01b5 | 626 | return 0; |
20263082 LP |
627 | } |
628 | ||
25a1ab4e | 629 | static int session_start_scope(Session *s, sd_bus_message *properties, sd_bus_error *error) { |
98a28fef LP |
630 | int r; |
631 | ||
632 | assert(s); | |
9444b1f2 | 633 | assert(s->user); |
98a28fef | 634 | |
fb6becb4 | 635 | if (!s->scope) { |
fb2367ed | 636 | _cleanup_free_ char *scope = NULL; |
90558f31 | 637 | const char *description; |
405e0255 | 638 | |
25a1ab4e LP |
639 | s->scope_job = mfree(s->scope_job); |
640 | ||
605405c6 | 641 | scope = strjoin("session-", s->id, ".scope"); |
d0af76e6 | 642 | if (!scope) |
ae018d9b LP |
643 | return log_oom(); |
644 | ||
81d62103 | 645 | description = strjoina("Session ", s->id, " of user ", s->user->name); |
90558f31 LP |
646 | |
647 | r = manager_start_scope( | |
648 | s->manager, | |
649 | scope, | |
650 | s->leader, | |
651 | s->user->slice, | |
652 | description, | |
124d7cb2 ZJS |
653 | /* These two have StopWhenUnneeded= set, hence add a dep towards them */ |
654 | STRV_MAKE(s->user->runtime_dir_service, | |
655 | s->user->service), | |
656 | /* And order us after some more */ | |
657 | STRV_MAKE("systemd-logind.service", | |
658 | "systemd-user-sessions.service", | |
659 | s->user->runtime_dir_service, | |
660 | s->user->service), | |
d5ac9d06 | 661 | s->user->home, |
22f93314 | 662 | properties, |
25a1ab4e LP |
663 | error, |
664 | &s->scope_job); | |
fb2367ed | 665 | if (r < 0) |
124d7cb2 ZJS |
666 | return log_error_errno(r, "Failed to start session scope %s: %s", |
667 | scope, bus_error_message(error, r)); | |
fb2367ed YW |
668 | |
669 | s->scope = TAKE_PTR(scope); | |
20263082 LP |
670 | } |
671 | ||
124d7cb2 | 672 | (void) hashmap_put(s->manager->session_units, s->scope, s); |
d0af76e6 | 673 | |
20263082 LP |
674 | return 0; |
675 | } | |
676 | ||
25a1ab4e | 677 | int session_start(Session *s, sd_bus_message *properties, sd_bus_error *error) { |
20263082 LP |
678 | int r; |
679 | ||
680 | assert(s); | |
9444b1f2 LP |
681 | |
682 | if (!s->user) | |
683 | return -ESTALE; | |
20263082 | 684 | |
25a1ab4e LP |
685 | if (s->stopping) |
686 | return -EINVAL; | |
687 | ||
9418f147 LP |
688 | if (s->started) |
689 | return 0; | |
690 | ||
ed18b08b LP |
691 | r = user_start(s->user); |
692 | if (r < 0) | |
693 | return r; | |
694 | ||
25a1ab4e | 695 | r = session_start_scope(s, properties, error); |
fb6becb4 LP |
696 | if (r < 0) |
697 | return r; | |
698 | ||
d9eb81f9 | 699 | log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO, |
2b044526 | 700 | "MESSAGE_ID=" SD_MESSAGE_SESSION_START_STR, |
877d54e9 LP |
701 | "SESSION_ID=%s", s->id, |
702 | "USER_ID=%s", s->user->name, | |
de0671ee | 703 | "LEADER="PID_FMT, s->leader, |
a1230ff9 | 704 | LOG_MESSAGE("New session %s of user %s.", s->id, s->user->name)); |
98a28fef | 705 | |
9444b1f2 LP |
706 | if (!dual_timestamp_is_set(&s->timestamp)) |
707 | dual_timestamp_get(&s->timestamp); | |
14c3baca | 708 | |
e9816c48 LP |
709 | if (s->seat) |
710 | seat_read_active_vt(s->seat); | |
711 | ||
9418f147 LP |
712 | s->started = true; |
713 | ||
952d3260 LP |
714 | user_elect_display(s->user); |
715 | ||
5f41d1f1 | 716 | /* Save data */ |
e9816c48 | 717 | session_save(s); |
7f7bb946 | 718 | user_save(s->user); |
5f41d1f1 LP |
719 | if (s->seat) |
720 | seat_save(s->seat); | |
e9816c48 | 721 | |
5f41d1f1 | 722 | /* Send signals */ |
da119395 | 723 | session_send_signal(s, true); |
7d049e30 | 724 | user_send_changed(s->user, "Display", NULL); |
9418f147 LP |
725 | if (s->seat) { |
726 | if (s->seat->active == s) | |
7d049e30 | 727 | seat_send_changed(s->seat, "ActiveSession", NULL); |
9418f147 LP |
728 | } |
729 | ||
20263082 LP |
730 | return 0; |
731 | } | |
732 | ||
9bb69af4 | 733 | static int session_stop_scope(Session *s, bool force) { |
4afd3348 | 734 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; |
20263082 | 735 | int r; |
20263082 LP |
736 | |
737 | assert(s); | |
738 | ||
fb6becb4 LP |
739 | if (!s->scope) |
740 | return 0; | |
9b221b63 | 741 | |
756ed0e2 | 742 | /* Let's always abandon the scope first. This tells systemd that we are not interested anymore, and everything |
629ff674 | 743 | * that is left in the scope is "left-over". Informing systemd about this has the benefit that it will log |
756ed0e2 LP |
744 | * when killing any processes left after this point. */ |
745 | r = manager_abandon_scope(s->manager, s->scope, &error); | |
25a1ab4e | 746 | if (r < 0) { |
756ed0e2 | 747 | log_warning_errno(r, "Failed to abandon session scope, ignoring: %s", bus_error_message(&error, r)); |
25a1ab4e LP |
748 | sd_bus_error_free(&error); |
749 | } | |
750 | ||
751 | s->scope_job = mfree(s->scope_job); | |
756ed0e2 LP |
752 | |
753 | /* Optionally, let's kill everything that's left now. */ | |
9bb69af4 | 754 | if (force || manager_shall_kill(s->manager, s->user->name)) { |
801a884d | 755 | |
25a1ab4e LP |
756 | r = manager_stop_unit(s->manager, s->scope, &error, &s->scope_job); |
757 | if (r < 0) { | |
758 | if (force) | |
759 | return log_error_errno(r, "Failed to stop session scope: %s", bus_error_message(&error, r)); | |
20263082 | 760 | |
25a1ab4e LP |
761 | log_warning_errno(r, "Failed to stop session scope, ignoring: %s", bus_error_message(&error, r)); |
762 | } | |
8150acb1 | 763 | } else { |
20263082 | 764 | |
8150acb1 AJ |
765 | /* With no killing, this session is allowed to persist in "closing" state indefinitely. |
766 | * Therefore session stop and session removal may be two distinct events. | |
767 | * Session stop is quite significant on its own, let's log it. */ | |
768 | log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO, | |
769 | "SESSION_ID=%s", s->id, | |
770 | "USER_ID=%s", s->user->name, | |
771 | "LEADER="PID_FMT, s->leader, | |
f4cf1d66 | 772 | LOG_MESSAGE("Session %s logged out. Waiting for processes to exit.", s->id)); |
8150acb1 AJ |
773 | } |
774 | ||
9b221b63 | 775 | return 0; |
20263082 LP |
776 | } |
777 | ||
9bb69af4 | 778 | int session_stop(Session *s, bool force) { |
405e0255 LP |
779 | int r; |
780 | ||
781 | assert(s); | |
782 | ||
25a1ab4e LP |
783 | /* This is called whenever we begin with tearing down a session record. It's called in four cases: explicit API |
784 | * request via the bus (either directly for the session object or for the seat or user object this session | |
785 | * belongs to; 'force' is true), or due to automatic GC (i.e. scope vanished; 'force' is false), or because the | |
786 | * session FIFO saw an EOF ('force' is false), or because the release timer hit ('force' is false). */ | |
787 | ||
405e0255 LP |
788 | if (!s->user) |
789 | return -ESTALE; | |
25a1ab4e LP |
790 | if (!s->started) |
791 | return 0; | |
792 | if (s->stopping) | |
793 | return 0; | |
405e0255 | 794 | |
5f41d1f1 LP |
795 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
796 | ||
10189fd6 DH |
797 | if (s->seat) |
798 | seat_evict_position(s->seat, s); | |
799 | ||
5f41d1f1 LP |
800 | /* We are going down, don't care about FIFOs anymore */ |
801 | session_remove_fifo(s); | |
802 | ||
405e0255 | 803 | /* Kill cgroup */ |
9bb69af4 | 804 | r = session_stop_scope(s, force); |
405e0255 | 805 | |
5f41d1f1 LP |
806 | s->stopping = true; |
807 | ||
952d3260 LP |
808 | user_elect_display(s->user); |
809 | ||
405e0255 | 810 | session_save(s); |
cc377381 | 811 | user_save(s->user); |
405e0255 LP |
812 | |
813 | return r; | |
814 | } | |
815 | ||
816 | int session_finalize(Session *s) { | |
118ecf32 | 817 | SessionDevice *sd; |
20263082 LP |
818 | |
819 | assert(s); | |
820 | ||
9444b1f2 LP |
821 | if (!s->user) |
822 | return -ESTALE; | |
823 | ||
ed18b08b | 824 | if (s->started) |
d9eb81f9 | 825 | log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO, |
2b044526 | 826 | "MESSAGE_ID=" SD_MESSAGE_SESSION_STOP_STR, |
877d54e9 LP |
827 | "SESSION_ID=%s", s->id, |
828 | "USER_ID=%s", s->user->name, | |
de0671ee | 829 | "LEADER="PID_FMT, s->leader, |
a1230ff9 | 830 | LOG_MESSAGE("Removed session %s.", s->id)); |
98a28fef | 831 | |
5f41d1f1 LP |
832 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
833 | ||
10189fd6 DH |
834 | if (s->seat) |
835 | seat_evict_position(s->seat, s); | |
836 | ||
118ecf32 DH |
837 | /* Kill session devices */ |
838 | while ((sd = hashmap_first(s->devices))) | |
839 | session_device_free(sd); | |
840 | ||
491ac9f2 | 841 | (void) unlink(s->state_file); |
d2f92cdf | 842 | session_add_to_gc_queue(s); |
ed18b08b | 843 | user_add_to_gc_queue(s->user); |
14c3baca | 844 | |
405e0255 | 845 | if (s->started) { |
ed18b08b | 846 | session_send_signal(s, false); |
405e0255 LP |
847 | s->started = false; |
848 | } | |
50fb9793 | 849 | |
9418f147 LP |
850 | if (s->seat) { |
851 | if (s->seat->active == s) | |
852 | seat_set_active(s->seat, NULL); | |
853 | ||
23bd3b62 | 854 | seat_save(s->seat); |
9418f147 LP |
855 | } |
856 | ||
23bd3b62 | 857 | user_save(s->user); |
7d049e30 | 858 | user_send_changed(s->user, "Display", NULL); |
9418f147 | 859 | |
491ac9f2 | 860 | return 0; |
20263082 LP |
861 | } |
862 | ||
5f41d1f1 LP |
863 | static int release_timeout_callback(sd_event_source *es, uint64_t usec, void *userdata) { |
864 | Session *s = userdata; | |
865 | ||
866 | assert(es); | |
867 | assert(s); | |
868 | ||
9bb69af4 | 869 | session_stop(s, false); |
5f41d1f1 LP |
870 | return 0; |
871 | } | |
872 | ||
ad8780c9 | 873 | int session_release(Session *s) { |
5f41d1f1 LP |
874 | assert(s); |
875 | ||
876 | if (!s->started || s->stopping) | |
ad8780c9 ZJS |
877 | return 0; |
878 | ||
879 | if (s->timer_event_source) | |
880 | return 0; | |
881 | ||
882 | return sd_event_add_time(s->manager->event, | |
883 | &s->timer_event_source, | |
884 | CLOCK_MONOTONIC, | |
061c6607 | 885 | usec_add(now(CLOCK_MONOTONIC), RELEASE_USEC), 0, |
ad8780c9 | 886 | release_timeout_callback, s); |
5f41d1f1 LP |
887 | } |
888 | ||
20263082 LP |
889 | bool session_is_active(Session *s) { |
890 | assert(s); | |
891 | ||
892 | if (!s->seat) | |
893 | return true; | |
894 | ||
895 | return s->seat->active == s; | |
896 | } | |
897 | ||
23406ce5 LP |
898 | static int get_tty_atime(const char *tty, usec_t *atime) { |
899 | _cleanup_free_ char *p = NULL; | |
a185c5aa | 900 | struct stat st; |
23406ce5 LP |
901 | |
902 | assert(tty); | |
903 | assert(atime); | |
904 | ||
905 | if (!path_is_absolute(tty)) { | |
b910cc72 | 906 | p = path_join("/dev", tty); |
23406ce5 LP |
907 | if (!p) |
908 | return -ENOMEM; | |
909 | ||
910 | tty = p; | |
911 | } else if (!path_startswith(tty, "/dev/")) | |
912 | return -ENOENT; | |
913 | ||
914 | if (lstat(tty, &st) < 0) | |
915 | return -errno; | |
916 | ||
917 | *atime = timespec_load(&st.st_atim); | |
918 | return 0; | |
919 | } | |
920 | ||
921 | static int get_process_ctty_atime(pid_t pid, usec_t *atime) { | |
922 | _cleanup_free_ char *p = NULL; | |
923 | int r; | |
924 | ||
925 | assert(pid > 0); | |
926 | assert(atime); | |
927 | ||
928 | r = get_ctty(pid, NULL, &p); | |
929 | if (r < 0) | |
930 | return r; | |
931 | ||
932 | return get_tty_atime(p, atime); | |
933 | } | |
934 | ||
935 | int session_get_idle_hint(Session *s, dual_timestamp *t) { | |
23406ce5 LP |
936 | usec_t atime = 0, n; |
937 | int r; | |
a185c5aa LP |
938 | |
939 | assert(s); | |
940 | ||
23406ce5 | 941 | /* Explicit idle hint is set */ |
a185c5aa LP |
942 | if (s->idle_hint) { |
943 | if (t) | |
944 | *t = s->idle_hint_timestamp; | |
945 | ||
946 | return s->idle_hint; | |
947 | } | |
948 | ||
0762eaa3 | 949 | /* Graphical sessions should really implement a real |
23406ce5 | 950 | * idle hint logic */ |
129baf1b | 951 | if (SESSION_TYPE_IS_GRAPHICAL(s->type)) |
a185c5aa LP |
952 | goto dont_know; |
953 | ||
23406ce5 LP |
954 | /* For sessions with an explicitly configured tty, let's check |
955 | * its atime */ | |
956 | if (s->tty) { | |
957 | r = get_tty_atime(s->tty, &atime); | |
958 | if (r >= 0) | |
959 | goto found_atime; | |
960 | } | |
a185c5aa | 961 | |
23406ce5 LP |
962 | /* For sessions with a leader but no explicitly configured |
963 | * tty, let's check the controlling tty of the leader */ | |
238794b1 | 964 | if (pid_is_valid(s->leader)) { |
23406ce5 LP |
965 | r = get_process_ctty_atime(s->leader, &atime); |
966 | if (r >= 0) | |
967 | goto found_atime; | |
a185c5aa LP |
968 | } |
969 | ||
a185c5aa LP |
970 | dont_know: |
971 | if (t) | |
972 | *t = s->idle_hint_timestamp; | |
973 | ||
974 | return 0; | |
23406ce5 LP |
975 | |
976 | found_atime: | |
977 | if (t) | |
978 | dual_timestamp_from_realtime(t, atime); | |
979 | ||
980 | n = now(CLOCK_REALTIME); | |
981 | ||
982 | if (s->manager->idle_action_usec <= 0) | |
983 | return 0; | |
984 | ||
985 | return atime + s->manager->idle_action_usec <= n; | |
a185c5aa LP |
986 | } |
987 | ||
bef422ae LP |
988 | void session_set_idle_hint(Session *s, bool b) { |
989 | assert(s); | |
990 | ||
991 | if (s->idle_hint == b) | |
992 | return; | |
993 | ||
994 | s->idle_hint = b; | |
995 | dual_timestamp_get(&s->idle_hint_timestamp); | |
9418f147 | 996 | |
cc377381 | 997 | session_send_changed(s, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); |
9418f147 LP |
998 | |
999 | if (s->seat) | |
cc377381 LP |
1000 | seat_send_changed(s->seat, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); |
1001 | ||
1002 | user_send_changed(s->user, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); | |
1003 | manager_send_changed(s->manager, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); | |
1004 | } | |
1005 | ||
42d35e13 VT |
1006 | int session_get_locked_hint(Session *s) { |
1007 | assert(s); | |
1008 | ||
1009 | return s->locked_hint; | |
1010 | } | |
1011 | ||
1012 | void session_set_locked_hint(Session *s, bool b) { | |
1013 | assert(s); | |
1014 | ||
1015 | if (s->locked_hint == b) | |
1016 | return; | |
1017 | ||
1018 | s->locked_hint = b; | |
1019 | ||
1020 | session_send_changed(s, "LockedHint", NULL); | |
1021 | } | |
1022 | ||
cc377381 LP |
1023 | static int session_dispatch_fifo(sd_event_source *es, int fd, uint32_t revents, void *userdata) { |
1024 | Session *s = userdata; | |
1025 | ||
1026 | assert(s); | |
1027 | assert(s->fifo_fd == fd); | |
1028 | ||
1029 | /* EOF on the FIFO means the session died abnormally. */ | |
1030 | ||
1031 | session_remove_fifo(s); | |
9bb69af4 | 1032 | session_stop(s, false); |
cc377381 LP |
1033 | |
1034 | return 1; | |
bef422ae LP |
1035 | } |
1036 | ||
932e3ee7 LP |
1037 | int session_create_fifo(Session *s) { |
1038 | int r; | |
1039 | ||
31b79c2b LP |
1040 | assert(s); |
1041 | ||
b4f78aea | 1042 | /* Create FIFO */ |
932e3ee7 | 1043 | if (!s->fifo_path) { |
37c1d5e9 | 1044 | r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0, MKDIR_WARN_MODE); |
e6061ab2 LP |
1045 | if (r < 0) |
1046 | return r; | |
1047 | ||
d5ddc930 LP |
1048 | s->fifo_path = strjoin("/run/systemd/sessions/", s->id, ".ref"); |
1049 | if (!s->fifo_path) | |
932e3ee7 | 1050 | return -ENOMEM; |
31b79c2b | 1051 | |
932e3ee7 LP |
1052 | if (mkfifo(s->fifo_path, 0600) < 0 && errno != EEXIST) |
1053 | return -errno; | |
1054 | } | |
31b79c2b | 1055 | |
932e3ee7 | 1056 | /* Open reading side */ |
b4f78aea | 1057 | if (s->fifo_fd < 0) { |
db4a47e9 | 1058 | s->fifo_fd = open(s->fifo_path, O_RDONLY|O_CLOEXEC|O_NONBLOCK); |
b4f78aea LP |
1059 | if (s->fifo_fd < 0) |
1060 | return -errno; | |
cc377381 LP |
1061 | } |
1062 | ||
1063 | if (!s->fifo_event_source) { | |
151b9b96 | 1064 | r = sd_event_add_io(s->manager->event, &s->fifo_event_source, s->fifo_fd, 0, session_dispatch_fifo, s); |
b4f78aea LP |
1065 | if (r < 0) |
1066 | return r; | |
1067 | ||
e11544a8 LP |
1068 | /* Let's make sure we noticed dead sessions before we process new bus requests (which might create new |
1069 | * sessions). */ | |
1070 | r = sd_event_source_set_priority(s->fifo_event_source, SD_EVENT_PRIORITY_NORMAL-10); | |
cc377381 LP |
1071 | if (r < 0) |
1072 | return r; | |
b4f78aea | 1073 | } |
932e3ee7 LP |
1074 | |
1075 | /* Open writing side */ | |
db4a47e9 | 1076 | r = open(s->fifo_path, O_WRONLY|O_CLOEXEC|O_NONBLOCK); |
932e3ee7 LP |
1077 | if (r < 0) |
1078 | return -errno; | |
31b79c2b | 1079 | |
932e3ee7 LP |
1080 | return r; |
1081 | } | |
1082 | ||
5f41d1f1 | 1083 | static void session_remove_fifo(Session *s) { |
932e3ee7 LP |
1084 | assert(s); |
1085 | ||
03e334a1 LP |
1086 | s->fifo_event_source = sd_event_source_unref(s->fifo_event_source); |
1087 | s->fifo_fd = safe_close(s->fifo_fd); | |
932e3ee7 LP |
1088 | |
1089 | if (s->fifo_path) { | |
75bbdf47 | 1090 | (void) unlink(s->fifo_path); |
a1e58e8e | 1091 | s->fifo_path = mfree(s->fifo_path); |
932e3ee7 | 1092 | } |
31b79c2b LP |
1093 | } |
1094 | ||
5c093a23 | 1095 | bool session_may_gc(Session *s, bool drop_not_started) { |
bd26aee1 LP |
1096 | int r; |
1097 | ||
20263082 LP |
1098 | assert(s); |
1099 | ||
4a4b033f | 1100 | if (drop_not_started && !s->started) |
5c093a23 | 1101 | return true; |
932e3ee7 | 1102 | |
9444b1f2 | 1103 | if (!s->user) |
5c093a23 | 1104 | return true; |
9444b1f2 | 1105 | |
932e3ee7 | 1106 | if (s->fifo_fd >= 0) { |
5f41d1f1 | 1107 | if (pipe_eof(s->fifo_fd) <= 0) |
5c093a23 | 1108 | return false; |
20263082 LP |
1109 | } |
1110 | ||
bd26aee1 LP |
1111 | if (s->scope_job) { |
1112 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; | |
1113 | ||
1114 | r = manager_job_is_active(s->manager, s->scope_job, &error); | |
1115 | if (r < 0) | |
1116 | log_debug_errno(r, "Failed to determine whether job '%s' is pending, ignoring: %s", s->scope_job, bus_error_message(&error, r)); | |
1117 | if (r != 0) | |
1118 | return false; | |
1119 | } | |
20263082 | 1120 | |
bd26aee1 LP |
1121 | if (s->scope) { |
1122 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; | |
1123 | ||
1124 | r = manager_unit_is_active(s->manager, s->scope, &error); | |
1125 | if (r < 0) | |
1126 | log_debug_errno(r, "Failed to determine whether unit '%s' is active, ignoring: %s", s->scope, bus_error_message(&error, r)); | |
1127 | if (r != 0) | |
1128 | return false; | |
1129 | } | |
20263082 | 1130 | |
5c093a23 | 1131 | return true; |
20263082 LP |
1132 | } |
1133 | ||
14c3baca LP |
1134 | void session_add_to_gc_queue(Session *s) { |
1135 | assert(s); | |
1136 | ||
1137 | if (s->in_gc_queue) | |
1138 | return; | |
1139 | ||
71fda00f | 1140 | LIST_PREPEND(gc_queue, s->manager->session_gc_queue, s); |
14c3baca LP |
1141 | s->in_gc_queue = true; |
1142 | } | |
1143 | ||
0604381b LP |
1144 | SessionState session_get_state(Session *s) { |
1145 | assert(s); | |
1146 | ||
8fe63cd4 | 1147 | /* always check closing first */ |
5f41d1f1 LP |
1148 | if (s->stopping || s->timer_event_source) |
1149 | return SESSION_CLOSING; | |
1150 | ||
8fe63cd4 | 1151 | if (s->scope_job || s->fifo_fd < 0) |
405e0255 | 1152 | return SESSION_OPENING; |
fb6becb4 | 1153 | |
0604381b LP |
1154 | if (session_is_active(s)) |
1155 | return SESSION_ACTIVE; | |
1156 | ||
1157 | return SESSION_ONLINE; | |
1158 | } | |
1159 | ||
de07ab16 | 1160 | int session_kill(Session *s, KillWho who, int signo) { |
de07ab16 LP |
1161 | assert(s); |
1162 | ||
fb6becb4 | 1163 | if (!s->scope) |
de07ab16 LP |
1164 | return -ESRCH; |
1165 | ||
fb6becb4 | 1166 | return manager_kill_unit(s->manager, s->scope, who, signo, NULL); |
de07ab16 LP |
1167 | } |
1168 | ||
90a18413 | 1169 | static int session_open_vt(Session *s) { |
5f41d1f1 | 1170 | char path[sizeof("/dev/tty") + DECIMAL_STR_MAX(s->vtnr)]; |
90a18413 | 1171 | |
baccf3e4 OB |
1172 | if (s->vtnr < 1) |
1173 | return -ENODEV; | |
90a18413 DH |
1174 | |
1175 | if (s->vtfd >= 0) | |
1176 | return s->vtfd; | |
1177 | ||
92bd5ff3 | 1178 | sprintf(path, "/dev/tty%u", s->vtnr); |
22356953 | 1179 | s->vtfd = open_terminal(path, O_RDWR | O_CLOEXEC | O_NONBLOCK | O_NOCTTY); |
4a62c710 | 1180 | if (s->vtfd < 0) |
709f6e46 | 1181 | return log_error_errno(s->vtfd, "cannot open VT %s of session %s: %m", path, s->id); |
90a18413 DH |
1182 | |
1183 | return s->vtfd; | |
1184 | } | |
1185 | ||
a03cdb17 | 1186 | static int session_prepare_vt(Session *s) { |
90a18413 | 1187 | int vt, r; |
9fb2c8b8 | 1188 | struct vt_mode mode = {}; |
90a18413 | 1189 | |
baccf3e4 OB |
1190 | if (s->vtnr < 1) |
1191 | return 0; | |
1192 | ||
90a18413 DH |
1193 | vt = session_open_vt(s); |
1194 | if (vt < 0) | |
baccf3e4 | 1195 | return vt; |
90a18413 | 1196 | |
d6176c6c | 1197 | r = fchown(vt, s->user->uid, -1); |
baccf3e4 | 1198 | if (r < 0) { |
94c156cd LP |
1199 | r = log_error_errno(errno, |
1200 | "Cannot change owner of /dev/tty%u: %m", | |
1201 | s->vtnr); | |
d6176c6c | 1202 | goto error; |
baccf3e4 | 1203 | } |
d6176c6c | 1204 | |
90a18413 | 1205 | r = ioctl(vt, KDSKBMODE, K_OFF); |
baccf3e4 | 1206 | if (r < 0) { |
94c156cd LP |
1207 | r = log_error_errno(errno, |
1208 | "Cannot set K_OFF on /dev/tty%u: %m", | |
1209 | s->vtnr); | |
90a18413 | 1210 | goto error; |
baccf3e4 | 1211 | } |
90a18413 DH |
1212 | |
1213 | r = ioctl(vt, KDSETMODE, KD_GRAPHICS); | |
baccf3e4 | 1214 | if (r < 0) { |
94c156cd LP |
1215 | r = log_error_errno(errno, |
1216 | "Cannot set KD_GRAPHICS on /dev/tty%u: %m", | |
1217 | s->vtnr); | |
90a18413 | 1218 | goto error; |
baccf3e4 | 1219 | } |
90a18413 | 1220 | |
90a18413 DH |
1221 | /* Oh, thanks to the VT layer, VT_AUTO does not work with KD_GRAPHICS. |
1222 | * So we need a dummy handler here which just acknowledges *all* VT | |
1223 | * switch requests. */ | |
1224 | mode.mode = VT_PROCESS; | |
92683ad2 DH |
1225 | mode.relsig = SIGRTMIN; |
1226 | mode.acqsig = SIGRTMIN + 1; | |
90a18413 | 1227 | r = ioctl(vt, VT_SETMODE, &mode); |
baccf3e4 | 1228 | if (r < 0) { |
94c156cd LP |
1229 | r = log_error_errno(errno, |
1230 | "Cannot set VT_PROCESS on /dev/tty%u: %m", | |
1231 | s->vtnr); | |
90a18413 | 1232 | goto error; |
baccf3e4 | 1233 | } |
90a18413 | 1234 | |
baccf3e4 | 1235 | return 0; |
90a18413 DH |
1236 | |
1237 | error: | |
90a18413 | 1238 | session_restore_vt(s); |
baccf3e4 | 1239 | return r; |
90a18413 DH |
1240 | } |
1241 | ||
0212126c | 1242 | static void session_restore_vt(Session *s) { |
c0f34168 | 1243 | int r, vt, old_fd; |
128df4cf | 1244 | |
c0f34168 FB |
1245 | /* We need to get a fresh handle to the virtual terminal, |
1246 | * since the old file-descriptor is potentially in a hung-up | |
1247 | * state after the controlling process exited; we do a | |
1248 | * little dance to avoid having the terminal be available | |
1249 | * for reuse before we've cleaned it up. | |
1250 | */ | |
1251 | old_fd = TAKE_FD(s->vtfd); | |
ad96887a | 1252 | |
c0f34168 FB |
1253 | vt = session_open_vt(s); |
1254 | safe_close(old_fd); | |
ad96887a | 1255 | |
c0f34168 FB |
1256 | if (vt < 0) |
1257 | return; | |
ad96887a | 1258 | |
c0f34168 FB |
1259 | r = vt_restore(vt); |
1260 | if (r < 0) | |
1261 | log_warning_errno(r, "Failed to restore VT, ignoring: %m"); | |
d6176c6c | 1262 | |
03e334a1 | 1263 | s->vtfd = safe_close(s->vtfd); |
90a18413 DH |
1264 | } |
1265 | ||
2ec3ff66 | 1266 | void session_leave_vt(Session *s) { |
ce540a24 DH |
1267 | int r; |
1268 | ||
2ec3ff66 DH |
1269 | assert(s); |
1270 | ||
1271 | /* This is called whenever we get a VT-switch signal from the kernel. | |
1272 | * We acknowledge all of them unconditionally. Note that session are | |
1273 | * free to overwrite those handlers and we only register them for | |
1274 | * sessions with controllers. Legacy sessions are not affected. | |
1275 | * However, if we switch from a non-legacy to a legacy session, we must | |
1276 | * make sure to pause all device before acknowledging the switch. We | |
1277 | * process the real switch only after we are notified via sysfs, so the | |
1278 | * legacy session might have already started using the devices. If we | |
1279 | * don't pause the devices before the switch, we might confuse the | |
1280 | * session we switch to. */ | |
1281 | ||
1282 | if (s->vtfd < 0) | |
1283 | return; | |
1284 | ||
1285 | session_device_pause_all(s); | |
27dafac9 | 1286 | r = vt_release(s->vtfd, false); |
ce540a24 | 1287 | if (r < 0) |
27dafac9 | 1288 | log_debug_errno(r, "Cannot release VT of session %s: %m", s->id); |
2ec3ff66 DH |
1289 | } |
1290 | ||
cc377381 | 1291 | bool session_is_controller(Session *s, const char *sender) { |
ae5e06bd DH |
1292 | assert(s); |
1293 | ||
1294 | return streq_ptr(s->controller, sender); | |
1295 | } | |
1296 | ||
b12e5615 DH |
1297 | static void session_release_controller(Session *s, bool notify) { |
1298 | _cleanup_free_ char *name = NULL; | |
6d33772f DH |
1299 | SessionDevice *sd; |
1300 | ||
b12e5615 DH |
1301 | if (!s->controller) |
1302 | return; | |
6d33772f | 1303 | |
b12e5615 | 1304 | name = s->controller; |
90a18413 | 1305 | |
b12e5615 DH |
1306 | /* By resetting the controller before releasing the devices, we won't |
1307 | * send notification signals. This avoids sending useless notifications | |
1308 | * if the controller is released on disconnects. */ | |
1309 | if (!notify) | |
1310 | s->controller = NULL; | |
6d33772f | 1311 | |
b12e5615 DH |
1312 | while ((sd = hashmap_first(s->devices))) |
1313 | session_device_free(sd); | |
1314 | ||
1315 | s->controller = NULL; | |
3cde9e8f DM |
1316 | s->track = sd_bus_track_unref(s->track); |
1317 | } | |
1318 | ||
1319 | static int on_bus_track(sd_bus_track *track, void *userdata) { | |
1320 | Session *s = userdata; | |
1321 | ||
1322 | assert(track); | |
1323 | assert(s); | |
1324 | ||
1325 | session_drop_controller(s); | |
1326 | ||
1327 | return 0; | |
6d33772f DH |
1328 | } |
1329 | ||
dc6284e9 | 1330 | int session_set_controller(Session *s, const char *sender, bool force, bool prepare) { |
b12e5615 | 1331 | _cleanup_free_ char *name = NULL; |
ae5e06bd DH |
1332 | int r; |
1333 | ||
1334 | assert(s); | |
1335 | assert(sender); | |
1336 | ||
1337 | if (session_is_controller(s, sender)) | |
1338 | return 0; | |
1339 | if (s->controller && !force) | |
1340 | return -EBUSY; | |
1341 | ||
b12e5615 DH |
1342 | name = strdup(sender); |
1343 | if (!name) | |
ae5e06bd DH |
1344 | return -ENOMEM; |
1345 | ||
3cde9e8f DM |
1346 | s->track = sd_bus_track_unref(s->track); |
1347 | r = sd_bus_track_new(s->manager->bus, &s->track, on_bus_track, s); | |
1348 | if (r < 0) | |
1349 | return r; | |
1350 | ||
1351 | r = sd_bus_track_add_name(s->track, name); | |
1352 | if (r < 0) | |
ae5e06bd | 1353 | return r; |
ae5e06bd | 1354 | |
90a18413 DH |
1355 | /* When setting a session controller, we forcibly mute the VT and set |
1356 | * it into graphics-mode. Applications can override that by changing | |
1357 | * VT state after calling TakeControl(). However, this serves as a good | |
1358 | * default and well-behaving controllers can now ignore VTs entirely. | |
1359 | * Note that we reset the VT on ReleaseControl() and if the controller | |
1360 | * exits. | |
1361 | * If logind crashes/restarts, we restore the controller during restart | |
dc6284e9 FB |
1362 | * (without preparing the VT since the controller has probably overridden |
1363 | * VT state by now) or reset the VT in case it crashed/exited, too. */ | |
1364 | if (prepare) { | |
1365 | r = session_prepare_vt(s); | |
1366 | if (r < 0) { | |
1367 | s->track = sd_bus_track_unref(s->track); | |
1368 | return r; | |
1369 | } | |
13f493dc | 1370 | } |
baccf3e4 | 1371 | |
b12e5615 | 1372 | session_release_controller(s, true); |
ae2a15bc | 1373 | s->controller = TAKE_PTR(name); |
b12e5615 | 1374 | session_save(s); |
90a18413 | 1375 | |
ae5e06bd DH |
1376 | return 0; |
1377 | } | |
1378 | ||
1379 | void session_drop_controller(Session *s) { | |
1380 | assert(s); | |
1381 | ||
1382 | if (!s->controller) | |
1383 | return; | |
1384 | ||
3cde9e8f | 1385 | s->track = sd_bus_track_unref(s->track); |
b12e5615 DH |
1386 | session_release_controller(s, false); |
1387 | session_save(s); | |
1388 | session_restore_vt(s); | |
ae5e06bd DH |
1389 | } |
1390 | ||
fb6becb4 LP |
1391 | static const char* const session_state_table[_SESSION_STATE_MAX] = { |
1392 | [SESSION_OPENING] = "opening", | |
0604381b LP |
1393 | [SESSION_ONLINE] = "online", |
1394 | [SESSION_ACTIVE] = "active", | |
1395 | [SESSION_CLOSING] = "closing" | |
1396 | }; | |
1397 | ||
1398 | DEFINE_STRING_TABLE_LOOKUP(session_state, SessionState); | |
1399 | ||
20263082 | 1400 | static const char* const session_type_table[_SESSION_TYPE_MAX] = { |
2c5859af | 1401 | [SESSION_UNSPECIFIED] = "unspecified", |
3f49d45a | 1402 | [SESSION_TTY] = "tty", |
98a28fef | 1403 | [SESSION_X11] = "x11", |
d9eb81f9 | 1404 | [SESSION_WAYLAND] = "wayland", |
9541666b | 1405 | [SESSION_MIR] = "mir", |
e9e74f28 | 1406 | [SESSION_WEB] = "web", |
20263082 LP |
1407 | }; |
1408 | ||
1409 | DEFINE_STRING_TABLE_LOOKUP(session_type, SessionType); | |
de07ab16 | 1410 | |
55efac6c LP |
1411 | static const char* const session_class_table[_SESSION_CLASS_MAX] = { |
1412 | [SESSION_USER] = "user", | |
1413 | [SESSION_GREETER] = "greeter", | |
e2acb67b LP |
1414 | [SESSION_LOCK_SCREEN] = "lock-screen", |
1415 | [SESSION_BACKGROUND] = "background" | |
55efac6c LP |
1416 | }; |
1417 | ||
1418 | DEFINE_STRING_TABLE_LOOKUP(session_class, SessionClass); | |
1419 | ||
de07ab16 LP |
1420 | static const char* const kill_who_table[_KILL_WHO_MAX] = { |
1421 | [KILL_LEADER] = "leader", | |
1422 | [KILL_ALL] = "all" | |
1423 | }; | |
1424 | ||
1425 | DEFINE_STRING_TABLE_LOOKUP(kill_who, KillWho); | |
3d0ef5c7 LP |
1426 | |
1427 | static const char* const tty_validity_table[_TTY_VALIDITY_MAX] = { | |
1428 | [TTY_FROM_PAM] = "from-pam", | |
1429 | [TTY_FROM_UTMP] = "from-utmp", | |
1430 | [TTY_UTMP_INCONSISTENT] = "utmp-inconsistent", | |
1431 | }; | |
1432 | ||
1433 | DEFINE_STRING_TABLE_LOOKUP(tty_validity, TTYValidity); |