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