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20263082 LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2011 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <string.h> | |
23 | #include <unistd.h> | |
24 | #include <errno.h> | |
25 | ||
90821c93 | 26 | #include "logind-user.h" |
20263082 LP |
27 | #include "util.h" |
28 | #include "cgroup-util.h" | |
29 | #include "hashmap.h" | |
30 | #include "strv.h" | |
31 | ||
32 | User* user_new(Manager *m, uid_t uid, gid_t gid, const char *name) { | |
33 | User *u; | |
34 | ||
35 | assert(m); | |
36 | assert(name); | |
37 | ||
14c3baca | 38 | u = new0(User, 1); |
20263082 LP |
39 | if (!u) |
40 | return NULL; | |
41 | ||
42 | u->name = strdup(name); | |
43 | if (!u->name) { | |
44 | free(u); | |
45 | return NULL; | |
46 | } | |
47 | ||
98a28fef | 48 | if (asprintf(&u->state_file, "/run/systemd/users/%lu", (unsigned long) uid) < 0) { |
20263082 LP |
49 | free(u->name); |
50 | free(u); | |
51 | return NULL; | |
52 | } | |
53 | ||
54 | if (hashmap_put(m->users, ULONG_TO_PTR((unsigned long) uid), u) < 0) { | |
55 | free(u->state_file); | |
56 | free(u->name); | |
57 | free(u); | |
58 | return NULL; | |
59 | } | |
60 | ||
61 | u->manager = m; | |
62 | u->uid = uid; | |
63 | u->gid = gid; | |
64 | ||
65 | return u; | |
66 | } | |
67 | ||
68 | void user_free(User *u) { | |
69 | assert(u); | |
70 | ||
14c3baca LP |
71 | if (u->in_gc_queue) |
72 | LIST_REMOVE(User, gc_queue, u->manager->user_gc_queue, u); | |
73 | ||
20263082 LP |
74 | while (u->sessions) |
75 | session_free(u->sessions); | |
76 | ||
77 | free(u->cgroup_path); | |
78 | ||
79 | free(u->service); | |
80 | free(u->runtime_path); | |
81 | ||
82 | hashmap_remove(u->manager->users, ULONG_TO_PTR((unsigned long) u->uid)); | |
83 | ||
84 | free(u->name); | |
d2f92cdf | 85 | free(u->state_file); |
20263082 LP |
86 | free(u); |
87 | } | |
88 | ||
89 | int user_save(User *u) { | |
90 | FILE *f; | |
91 | int r; | |
14c3baca | 92 | char *temp_path; |
20263082 LP |
93 | |
94 | assert(u); | |
95 | assert(u->state_file); | |
96 | ||
98a28fef | 97 | r = safe_mkdir("/run/systemd/users", 0755, 0, 0); |
20263082 | 98 | if (r < 0) |
14c3baca | 99 | goto finish; |
20263082 | 100 | |
14c3baca LP |
101 | r = fopen_temporary(u->state_file, &f, &temp_path); |
102 | if (r < 0) | |
103 | goto finish; | |
104 | ||
105 | fchmod(fileno(f), 0644); | |
20263082 LP |
106 | |
107 | fprintf(f, | |
14c3baca | 108 | "# This is private data. Do not parse.\n" |
20263082 LP |
109 | "NAME=%s\n" |
110 | "STATE=%s\n", | |
111 | u->name, | |
112 | user_state_to_string(user_get_state(u))); | |
113 | ||
114 | if (u->cgroup_path) | |
115 | fprintf(f, | |
116 | "CGROUP=%s\n", | |
117 | u->cgroup_path); | |
118 | ||
119 | if (u->runtime_path) | |
120 | fprintf(f, | |
121 | "RUNTIME=%s\n", | |
122 | u->runtime_path); | |
123 | ||
124 | if (u->service) | |
125 | fprintf(f, | |
126 | "SERVICE=%s\n", | |
127 | u->service); | |
128 | ||
129 | if (u->display) | |
130 | fprintf(f, | |
131 | "DISPLAY=%s\n", | |
132 | u->display->id); | |
133 | ||
134 | fflush(f); | |
14c3baca LP |
135 | |
136 | if (ferror(f) || rename(temp_path, u->state_file) < 0) { | |
20263082 LP |
137 | r = -errno; |
138 | unlink(u->state_file); | |
14c3baca | 139 | unlink(temp_path); |
20263082 LP |
140 | } |
141 | ||
142 | fclose(f); | |
14c3baca LP |
143 | free(temp_path); |
144 | ||
145 | finish: | |
146 | if (r < 0) | |
147 | log_error("Failed to save user data for %s: %s", u->name, strerror(-r)); | |
148 | ||
20263082 LP |
149 | return r; |
150 | } | |
151 | ||
152 | int user_load(User *u) { | |
153 | int r; | |
154 | char *display = NULL; | |
98a28fef | 155 | Session *s = NULL; |
20263082 LP |
156 | |
157 | assert(u); | |
158 | ||
a185c5aa | 159 | r = parse_env_file(u->state_file, NEWLINE, |
20263082 LP |
160 | "CGROUP", &u->cgroup_path, |
161 | "RUNTIME", &u->runtime_path, | |
162 | "SERVICE", &u->service, | |
163 | "DISPLAY", &display, | |
164 | NULL); | |
165 | if (r < 0) { | |
166 | free(display); | |
167 | ||
168 | if (r == -ENOENT) | |
169 | return 0; | |
170 | ||
171 | log_error("Failed to read %s: %s", u->state_file, strerror(-r)); | |
172 | return r; | |
173 | } | |
174 | ||
98a28fef LP |
175 | if (display) { |
176 | s = hashmap_get(u->manager->sessions, display); | |
177 | free(display); | |
178 | } | |
20263082 LP |
179 | |
180 | if (s && s->display && x11_display_is_local(s->display)) | |
181 | u->display = s; | |
182 | ||
183 | return r; | |
184 | } | |
185 | ||
186 | static int user_mkdir_runtime_path(User *u) { | |
187 | char *p; | |
188 | int r; | |
189 | ||
190 | assert(u); | |
191 | ||
192 | r = safe_mkdir("/run/user", 0755, 0, 0); | |
193 | if (r < 0) { | |
194 | log_error("Failed to create /run/user: %s", strerror(-r)); | |
195 | return r; | |
196 | } | |
197 | ||
198 | if (!u->runtime_path) { | |
199 | p = strappend("/run/user/", u->name); | |
200 | ||
201 | if (!p) { | |
202 | log_error("Out of memory"); | |
203 | return -ENOMEM; | |
204 | } | |
205 | } else | |
206 | p = u->runtime_path; | |
207 | ||
208 | r = safe_mkdir(p, 0700, u->uid, u->gid); | |
209 | if (r < 0) { | |
210 | log_error("Failed to create runtime directory %s: %s", p, strerror(-r)); | |
211 | free(p); | |
212 | u->runtime_path = NULL; | |
213 | return r; | |
214 | } | |
215 | ||
216 | u->runtime_path = p; | |
217 | return 0; | |
218 | } | |
219 | ||
220 | static int user_create_cgroup(User *u) { | |
221 | char **k; | |
222 | char *p; | |
223 | int r; | |
224 | ||
225 | assert(u); | |
226 | ||
227 | if (!u->cgroup_path) { | |
228 | if (asprintf(&p, "%s/%s", u->manager->cgroup_path, u->name) < 0) { | |
229 | log_error("Out of memory"); | |
230 | return -ENOMEM; | |
231 | } | |
232 | } else | |
233 | p = u->cgroup_path; | |
234 | ||
235 | r = cg_create(SYSTEMD_CGROUP_CONTROLLER, p); | |
236 | if (r < 0) { | |
237 | free(p); | |
238 | u->cgroup_path = NULL; | |
239 | log_error("Failed to create cgroup "SYSTEMD_CGROUP_CONTROLLER":%s: %s", p, strerror(-r)); | |
240 | return r; | |
241 | } | |
242 | ||
243 | u->cgroup_path = p; | |
244 | ||
245 | STRV_FOREACH(k, u->manager->controllers) { | |
246 | r = cg_create(*k, p); | |
247 | if (r < 0) | |
248 | log_warning("Failed to create cgroup %s:%s: %s", *k, p, strerror(-r)); | |
249 | } | |
250 | ||
251 | return 0; | |
252 | } | |
253 | ||
254 | static int user_start_service(User *u) { | |
255 | assert(u); | |
256 | ||
257 | return 0; | |
258 | } | |
259 | ||
260 | int user_start(User *u) { | |
261 | int r; | |
262 | ||
263 | assert(u); | |
264 | ||
9418f147 LP |
265 | if (u->started) |
266 | return 0; | |
267 | ||
20263082 LP |
268 | /* Make XDG_RUNTIME_DIR */ |
269 | r = user_mkdir_runtime_path(u); | |
270 | if (r < 0) | |
271 | return r; | |
272 | ||
273 | /* Create cgroup */ | |
274 | r = user_create_cgroup(u); | |
275 | if (r < 0) | |
276 | return r; | |
277 | ||
278 | /* Spawn user systemd */ | |
279 | r = user_start_service(u); | |
280 | if (r < 0) | |
281 | return r; | |
282 | ||
14c3baca LP |
283 | /* Save new user data */ |
284 | user_save(u); | |
285 | ||
20263082 LP |
286 | dual_timestamp_get(&u->timestamp); |
287 | ||
9418f147 LP |
288 | u->started = true; |
289 | ||
da119395 LP |
290 | user_send_signal(u, true); |
291 | ||
20263082 LP |
292 | return 0; |
293 | } | |
294 | ||
295 | static int user_stop_service(User *u) { | |
296 | assert(u); | |
297 | ||
298 | if (!u->service) | |
299 | return 0; | |
300 | ||
301 | return 0; | |
302 | } | |
303 | ||
304 | static int user_shall_kill(User *u) { | |
305 | assert(u); | |
306 | ||
307 | return u->manager->kill_user_processes; | |
308 | } | |
309 | ||
310 | static int user_kill_cgroup(User *u) { | |
311 | int r; | |
312 | char **k; | |
313 | ||
314 | assert(u); | |
315 | ||
316 | if (!u->cgroup_path) | |
317 | return 0; | |
318 | ||
319 | cg_trim(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, false); | |
320 | ||
321 | if (user_shall_kill(u)) { | |
322 | ||
323 | r = cg_kill_recursive_and_wait(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, true); | |
324 | if (r < 0) | |
325 | log_error("Failed to kill user cgroup: %s", strerror(-r)); | |
326 | } else { | |
327 | ||
328 | r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, true); | |
329 | if (r < 0) | |
330 | log_error("Failed to check user cgroup: %s", strerror(-r)); | |
331 | else if (r > 0) { | |
332 | r = cg_delete(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path); | |
333 | if (r < 0) | |
334 | log_error("Failed to delete user cgroup: %s", strerror(-r)); | |
335 | } else | |
336 | r = -EBUSY; | |
337 | } | |
338 | ||
339 | STRV_FOREACH(k, u->manager->controllers) | |
340 | cg_trim(*k, u->cgroup_path, true); | |
341 | ||
342 | free(u->cgroup_path); | |
343 | u->cgroup_path = NULL; | |
344 | ||
345 | return r; | |
346 | } | |
347 | ||
348 | static int user_remove_runtime_path(User *u) { | |
349 | int r; | |
350 | ||
351 | assert(u); | |
352 | ||
353 | if (!u->runtime_path) | |
354 | return 0; | |
355 | ||
356 | r = rm_rf(u->runtime_path, false, true); | |
357 | if (r < 0) | |
358 | log_error("Failed to remove runtime directory %s: %s", u->runtime_path, strerror(-r)); | |
359 | ||
360 | free(u->runtime_path); | |
361 | u->runtime_path = NULL; | |
362 | ||
363 | return r; | |
364 | } | |
365 | ||
366 | int user_stop(User *u) { | |
367 | Session *s; | |
368 | int r = 0, k; | |
369 | assert(u); | |
370 | ||
9418f147 LP |
371 | if (!u->started) |
372 | return 0; | |
373 | ||
20263082 LP |
374 | LIST_FOREACH(sessions_by_user, s, u->sessions) { |
375 | k = session_stop(s); | |
376 | if (k < 0) | |
377 | r = k; | |
378 | } | |
379 | ||
da119395 LP |
380 | user_send_signal(u, false); |
381 | ||
20263082 LP |
382 | /* Kill systemd */ |
383 | k = user_stop_service(u); | |
384 | if (k < 0) | |
385 | r = k; | |
386 | ||
387 | /* Kill cgroup */ | |
388 | k = user_kill_cgroup(u); | |
389 | if (k < 0) | |
390 | r = k; | |
391 | ||
392 | /* Kill XDG_RUNTIME_DIR */ | |
393 | k = user_remove_runtime_path(u); | |
394 | if (k < 0) | |
395 | r = k; | |
396 | ||
d2f92cdf LP |
397 | unlink(u->state_file); |
398 | user_add_to_gc_queue(u); | |
399 | ||
9418f147 LP |
400 | u->started = false; |
401 | ||
20263082 LP |
402 | return r; |
403 | } | |
404 | ||
a185c5aa LP |
405 | int user_get_idle_hint(User *u, dual_timestamp *t) { |
406 | Session *s; | |
407 | bool idle_hint = true; | |
408 | dual_timestamp ts = { 0, 0 }; | |
409 | ||
410 | assert(u); | |
411 | ||
412 | LIST_FOREACH(sessions_by_user, s, u->sessions) { | |
413 | dual_timestamp k; | |
414 | int ih; | |
415 | ||
416 | ih = session_get_idle_hint(s, &k); | |
417 | if (ih < 0) | |
418 | return ih; | |
419 | ||
420 | if (!ih) { | |
421 | if (!idle_hint) { | |
422 | if (k.monotonic < ts.monotonic) | |
423 | ts = k; | |
424 | } else { | |
425 | idle_hint = false; | |
426 | ts = k; | |
427 | } | |
428 | } else if (idle_hint) { | |
429 | ||
430 | if (k.monotonic > ts.monotonic) | |
431 | ts = k; | |
432 | } | |
433 | } | |
434 | ||
435 | if (t) | |
436 | *t = ts; | |
437 | ||
438 | return idle_hint; | |
439 | } | |
440 | ||
20263082 LP |
441 | int user_check_gc(User *u) { |
442 | int r; | |
443 | char *p; | |
444 | ||
445 | assert(u); | |
446 | ||
447 | if (u->sessions) | |
448 | return 1; | |
449 | ||
450 | if (asprintf(&p, "/var/lib/systemd/linger/%s", u->name) < 0) | |
451 | return -ENOMEM; | |
452 | ||
453 | r = access(p, F_OK) >= 0; | |
454 | free(p); | |
455 | ||
456 | if (r > 0) | |
457 | return 1; | |
458 | ||
459 | if (u->cgroup_path) { | |
460 | r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, false); | |
461 | if (r < 0) | |
462 | return r; | |
463 | ||
464 | if (r <= 0) | |
465 | return 1; | |
466 | } | |
467 | ||
468 | return 0; | |
469 | } | |
470 | ||
14c3baca LP |
471 | void user_add_to_gc_queue(User *u) { |
472 | assert(u); | |
473 | ||
474 | if (u->in_gc_queue) | |
475 | return; | |
476 | ||
477 | LIST_PREPEND(User, gc_queue, u->manager->user_gc_queue, u); | |
478 | u->in_gc_queue = true; | |
479 | } | |
480 | ||
20263082 LP |
481 | UserState user_get_state(User *u) { |
482 | Session *i; | |
483 | ||
484 | assert(u); | |
485 | ||
486 | if (!u->sessions) | |
487 | return USER_LINGERING; | |
488 | ||
489 | LIST_FOREACH(sessions_by_user, i, u->sessions) | |
490 | if (session_is_active(i)) | |
491 | return USER_ACTIVE; | |
492 | ||
493 | return USER_ONLINE; | |
494 | } | |
495 | ||
496 | static const char* const user_state_table[_USER_STATE_MAX] = { | |
497 | [USER_OFFLINE] = "offline", | |
498 | [USER_LINGERING] = "lingering", | |
499 | [USER_ONLINE] = "online", | |
500 | [USER_ACTIVE] = "active" | |
501 | }; | |
502 | ||
503 | DEFINE_STRING_TABLE_LOOKUP(user_state, UserState); |