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f8e2fb7b LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2012 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 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 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <errno.h> | |
23 | #include <fcntl.h> | |
f8e2fb7b | 24 | #include <string.h> |
f8e2fb7b LP |
25 | #include <unistd.h> |
26 | ||
27 | #include "util.h" | |
28 | #include "mkdir.h" | |
9eb977db | 29 | #include "path-util.h" |
f8e2fb7b | 30 | #include "logind-inhibit.h" |
a5c32cff | 31 | #include "fileio.h" |
f8e2fb7b LP |
32 | |
33 | Inhibitor* inhibitor_new(Manager *m, const char* id) { | |
34 | Inhibitor *i; | |
35 | ||
36 | assert(m); | |
37 | ||
38 | i = new0(Inhibitor, 1); | |
39 | if (!i) | |
40 | return NULL; | |
41 | ||
42 | i->state_file = strappend("/run/systemd/inhibit/", id); | |
43 | if (!i->state_file) { | |
44 | free(i); | |
45 | return NULL; | |
46 | } | |
47 | ||
2b6bf07d | 48 | i->id = basename(i->state_file); |
f8e2fb7b LP |
49 | |
50 | if (hashmap_put(m->inhibitors, i->id, i) < 0) { | |
51 | free(i->state_file); | |
52 | free(i); | |
53 | return NULL; | |
54 | } | |
55 | ||
56 | i->manager = m; | |
57 | i->fifo_fd = -1; | |
58 | ||
59 | return i; | |
60 | } | |
61 | ||
62 | void inhibitor_free(Inhibitor *i) { | |
63 | assert(i); | |
64 | ||
f8e2fb7b | 65 | hashmap_remove(i->manager->inhibitors, i->id); |
cc377381 | 66 | |
f8e2fb7b LP |
67 | inhibitor_remove_fifo(i); |
68 | ||
cc377381 LP |
69 | free(i->who); |
70 | free(i->why); | |
71 | ||
f8e2fb7b LP |
72 | if (i->state_file) { |
73 | unlink(i->state_file); | |
74 | free(i->state_file); | |
75 | } | |
76 | ||
77 | free(i); | |
78 | } | |
79 | ||
80 | int inhibitor_save(Inhibitor *i) { | |
cc377381 LP |
81 | _cleanup_free_ char *temp_path = NULL; |
82 | _cleanup_fclose_ FILE *f = NULL; | |
f8e2fb7b | 83 | int r; |
f8e2fb7b LP |
84 | |
85 | assert(i); | |
86 | ||
d2e54fae | 87 | r = mkdir_safe_label("/run/systemd/inhibit", 0755, 0, 0); |
f8e2fb7b LP |
88 | if (r < 0) |
89 | goto finish; | |
90 | ||
91 | r = fopen_temporary(i->state_file, &f, &temp_path); | |
92 | if (r < 0) | |
93 | goto finish; | |
94 | ||
95 | fchmod(fileno(f), 0644); | |
96 | ||
97 | fprintf(f, | |
98 | "# This is private data. Do not parse.\n" | |
99 | "WHAT=%s\n" | |
eecd1362 | 100 | "MODE=%s\n" |
90b2de37 ZJS |
101 | "UID="UID_FMT"\n" |
102 | "PID="PID_FMT"\n", | |
f8e2fb7b | 103 | inhibit_what_to_string(i->what), |
eecd1362 | 104 | inhibit_mode_to_string(i->mode), |
90b2de37 ZJS |
105 | i->uid, |
106 | i->pid); | |
f8e2fb7b LP |
107 | |
108 | if (i->who) { | |
cc377381 LP |
109 | _cleanup_free_ char *cc = NULL; |
110 | ||
f8e2fb7b LP |
111 | cc = cescape(i->who); |
112 | if (!cc) | |
113 | r = -ENOMEM; | |
cc377381 | 114 | else |
f8e2fb7b | 115 | fprintf(f, "WHO=%s\n", cc); |
f8e2fb7b LP |
116 | } |
117 | ||
118 | if (i->why) { | |
cc377381 LP |
119 | _cleanup_free_ char *cc = NULL; |
120 | ||
f8e2fb7b LP |
121 | cc = cescape(i->why); |
122 | if (!cc) | |
123 | r = -ENOMEM; | |
cc377381 | 124 | else |
f8e2fb7b | 125 | fprintf(f, "WHY=%s\n", cc); |
f8e2fb7b LP |
126 | } |
127 | ||
128 | if (i->fifo_path) | |
129 | fprintf(f, "FIFO=%s\n", i->fifo_path); | |
130 | ||
131 | fflush(f); | |
132 | ||
133 | if (ferror(f) || rename(temp_path, i->state_file) < 0) { | |
134 | r = -errno; | |
135 | unlink(i->state_file); | |
136 | unlink(temp_path); | |
137 | } | |
138 | ||
f8e2fb7b LP |
139 | finish: |
140 | if (r < 0) | |
90b2de37 | 141 | log_error("Failed to save inhibit data %s: %s", i->state_file, strerror(-r)); |
f8e2fb7b LP |
142 | |
143 | return r; | |
144 | } | |
145 | ||
146 | int inhibitor_start(Inhibitor *i) { | |
147 | assert(i); | |
148 | ||
149 | if (i->started) | |
150 | return 0; | |
151 | ||
c7b5eb98 LP |
152 | dual_timestamp_get(&i->since); |
153 | ||
de0671ee | 154 | log_debug("Inhibitor %s (%s) pid="PID_FMT" uid="UID_FMT" mode=%s started.", |
f8e2fb7b | 155 | strna(i->who), strna(i->why), |
de0671ee | 156 | i->pid, i->uid, |
eecd1362 | 157 | inhibit_mode_to_string(i->mode)); |
f8e2fb7b LP |
158 | |
159 | inhibitor_save(i); | |
160 | ||
161 | i->started = true; | |
162 | ||
cc377381 | 163 | manager_send_changed(i->manager, i->mode == INHIBIT_BLOCK ? "BlockInhibited" : "DelayInhibited", NULL); |
f8e2fb7b LP |
164 | |
165 | return 0; | |
166 | } | |
167 | ||
168 | int inhibitor_stop(Inhibitor *i) { | |
169 | assert(i); | |
170 | ||
171 | if (i->started) | |
de0671ee | 172 | log_debug("Inhibitor %s (%s) pid="PID_FMT" uid="UID_FMT" mode=%s stopped.", |
f8e2fb7b | 173 | strna(i->who), strna(i->why), |
de0671ee | 174 | i->pid, i->uid, |
eecd1362 | 175 | inhibit_mode_to_string(i->mode)); |
f8e2fb7b LP |
176 | |
177 | if (i->state_file) | |
178 | unlink(i->state_file); | |
179 | ||
180 | i->started = false; | |
181 | ||
cc377381 | 182 | manager_send_changed(i->manager, i->mode == INHIBIT_BLOCK ? "BlockInhibited" : "DelayInhibited", NULL); |
f8e2fb7b LP |
183 | |
184 | return 0; | |
185 | } | |
186 | ||
187 | int inhibitor_load(Inhibitor *i) { | |
cc377381 LP |
188 | |
189 | _cleanup_free_ char | |
f8e2fb7b LP |
190 | *what = NULL, |
191 | *uid = NULL, | |
192 | *pid = NULL, | |
193 | *who = NULL, | |
eecd1362 LP |
194 | *why = NULL, |
195 | *mode = NULL; | |
f8e2fb7b | 196 | |
cc377381 LP |
197 | InhibitWhat w; |
198 | InhibitMode mm; | |
199 | char *cc; | |
200 | int r; | |
201 | ||
f8e2fb7b LP |
202 | r = parse_env_file(i->state_file, NEWLINE, |
203 | "WHAT", &what, | |
204 | "UID", &uid, | |
205 | "PID", &pid, | |
206 | "WHO", &who, | |
207 | "WHY", &why, | |
eecd1362 | 208 | "MODE", &mode, |
f8e2fb7b LP |
209 | "FIFO", &i->fifo_path, |
210 | NULL); | |
211 | if (r < 0) | |
cc377381 | 212 | return r; |
f8e2fb7b | 213 | |
eecd1362 | 214 | w = what ? inhibit_what_from_string(what) : 0; |
f8e2fb7b LP |
215 | if (w >= 0) |
216 | i->what = w; | |
217 | ||
eecd1362 LP |
218 | mm = mode ? inhibit_mode_from_string(mode) : INHIBIT_BLOCK; |
219 | if (mm >= 0) | |
220 | i->mode = mm; | |
221 | ||
a34faf57 LN |
222 | if (uid) { |
223 | r = parse_uid(uid, &i->uid); | |
224 | if (r < 0) | |
cc377381 | 225 | return r; |
a34faf57 | 226 | } |
eecd1362 | 227 | |
a34faf57 LN |
228 | if (pid) { |
229 | r = parse_pid(pid, &i->pid); | |
230 | if (r < 0) | |
cc377381 | 231 | return r; |
a34faf57 | 232 | } |
f8e2fb7b LP |
233 | |
234 | if (who) { | |
235 | cc = cunescape(who); | |
cc377381 LP |
236 | if (!cc) |
237 | return -ENOMEM; | |
f8e2fb7b LP |
238 | |
239 | free(i->who); | |
240 | i->who = cc; | |
241 | } | |
242 | ||
243 | if (why) { | |
244 | cc = cunescape(why); | |
cc377381 LP |
245 | if (!cc) |
246 | return -ENOMEM; | |
f8e2fb7b LP |
247 | |
248 | free(i->why); | |
249 | i->why = cc; | |
250 | } | |
251 | ||
252 | if (i->fifo_path) { | |
253 | int fd; | |
254 | ||
255 | fd = inhibitor_create_fifo(i); | |
03e334a1 | 256 | safe_close(fd); |
f8e2fb7b LP |
257 | } |
258 | ||
cc377381 LP |
259 | return 0; |
260 | } | |
f8e2fb7b | 261 | |
cc377381 LP |
262 | static int inhibitor_dispatch_fifo(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
263 | Inhibitor *i = userdata; | |
264 | ||
265 | assert(s); | |
266 | assert(fd == i->fifo_fd); | |
267 | assert(i); | |
268 | ||
269 | inhibitor_stop(i); | |
270 | inhibitor_free(i); | |
271 | ||
272 | return 0; | |
f8e2fb7b LP |
273 | } |
274 | ||
275 | int inhibitor_create_fifo(Inhibitor *i) { | |
276 | int r; | |
277 | ||
278 | assert(i); | |
279 | ||
280 | /* Create FIFO */ | |
281 | if (!i->fifo_path) { | |
d2e54fae | 282 | r = mkdir_safe_label("/run/systemd/inhibit", 0755, 0, 0); |
f8e2fb7b LP |
283 | if (r < 0) |
284 | return r; | |
285 | ||
cc377381 LP |
286 | i->fifo_path = strjoin("/run/systemd/inhibit/", i->id, ".ref", NULL); |
287 | if (!i->fifo_path) | |
f8e2fb7b LP |
288 | return -ENOMEM; |
289 | ||
290 | if (mkfifo(i->fifo_path, 0600) < 0 && errno != EEXIST) | |
291 | return -errno; | |
292 | } | |
293 | ||
294 | /* Open reading side */ | |
295 | if (i->fifo_fd < 0) { | |
f8e2fb7b LP |
296 | i->fifo_fd = open(i->fifo_path, O_RDONLY|O_CLOEXEC|O_NDELAY); |
297 | if (i->fifo_fd < 0) | |
298 | return -errno; | |
cc377381 | 299 | } |
f8e2fb7b | 300 | |
cc377381 | 301 | if (!i->event_source) { |
151b9b96 | 302 | r = sd_event_add_io(i->manager->event, &i->event_source, i->fifo_fd, 0, inhibitor_dispatch_fifo, i); |
f8e2fb7b LP |
303 | if (r < 0) |
304 | return r; | |
305 | ||
718db961 | 306 | r = sd_event_source_set_priority(i->event_source, SD_EVENT_PRIORITY_IDLE); |
cc377381 LP |
307 | if (r < 0) |
308 | return r; | |
f8e2fb7b LP |
309 | } |
310 | ||
311 | /* Open writing side */ | |
312 | r = open(i->fifo_path, O_WRONLY|O_CLOEXEC|O_NDELAY); | |
313 | if (r < 0) | |
314 | return -errno; | |
315 | ||
316 | return r; | |
317 | } | |
318 | ||
319 | void inhibitor_remove_fifo(Inhibitor *i) { | |
320 | assert(i); | |
321 | ||
03e334a1 LP |
322 | i->event_source = sd_event_source_unref(i->event_source); |
323 | i->fifo_fd = safe_close(i->fifo_fd); | |
f8e2fb7b LP |
324 | |
325 | if (i->fifo_path) { | |
326 | unlink(i->fifo_path); | |
327 | free(i->fifo_path); | |
328 | i->fifo_path = NULL; | |
329 | } | |
330 | } | |
331 | ||
eecd1362 | 332 | InhibitWhat manager_inhibit_what(Manager *m, InhibitMode mm) { |
f8e2fb7b LP |
333 | Inhibitor *i; |
334 | Iterator j; | |
335 | InhibitWhat what = 0; | |
336 | ||
337 | assert(m); | |
338 | ||
cc377381 | 339 | HASHMAP_FOREACH(i, m->inhibitors, j) |
eecd1362 LP |
340 | if (i->mode == mm) |
341 | what |= i->what; | |
f8e2fb7b LP |
342 | |
343 | return what; | |
344 | } | |
345 | ||
beaafb2e LP |
346 | static int pid_is_active(Manager *m, pid_t pid) { |
347 | Session *s; | |
348 | int r; | |
349 | ||
350 | r = manager_get_session_by_pid(m, pid, &s); | |
2c4f86c1 | 351 | if (r < 0) |
beaafb2e LP |
352 | return r; |
353 | ||
2c4f86c1 LP |
354 | /* If there's no session assigned to it, then it's globally |
355 | * active on all ttys */ | |
356 | if (r == 0) | |
357 | return 1; | |
358 | ||
beaafb2e LP |
359 | return session_is_active(s); |
360 | } | |
361 | ||
362 | bool manager_is_inhibited( | |
363 | Manager *m, | |
364 | InhibitWhat w, | |
365 | InhibitMode mm, | |
366 | dual_timestamp *since, | |
409133be LP |
367 | bool ignore_inactive, |
368 | bool ignore_uid, | |
85a428c6 LP |
369 | uid_t uid, |
370 | Inhibitor **offending) { | |
beaafb2e | 371 | |
c7b5eb98 LP |
372 | Inhibitor *i; |
373 | Iterator j; | |
374 | struct dual_timestamp ts = { 0, 0 }; | |
375 | bool inhibited = false; | |
376 | ||
377 | assert(m); | |
378 | assert(w > 0 && w < _INHIBIT_WHAT_MAX); | |
379 | ||
cc377381 | 380 | HASHMAP_FOREACH(i, m->inhibitors, j) { |
c7b5eb98 LP |
381 | if (!(i->what & w)) |
382 | continue; | |
383 | ||
eecd1362 LP |
384 | if (i->mode != mm) |
385 | continue; | |
386 | ||
409133be LP |
387 | if (ignore_inactive && pid_is_active(m, i->pid) <= 0) |
388 | continue; | |
389 | ||
390 | if (ignore_uid && i->uid == uid) | |
beaafb2e LP |
391 | continue; |
392 | ||
c7b5eb98 LP |
393 | if (!inhibited || |
394 | i->since.monotonic < ts.monotonic) | |
395 | ts = i->since; | |
396 | ||
397 | inhibited = true; | |
85a428c6 LP |
398 | |
399 | if (offending) | |
400 | *offending = i; | |
c7b5eb98 LP |
401 | } |
402 | ||
403 | if (since) | |
404 | *since = ts; | |
405 | ||
406 | return inhibited; | |
407 | } | |
408 | ||
f8e2fb7b | 409 | const char *inhibit_what_to_string(InhibitWhat w) { |
ec202eae | 410 | static thread_local char buffer[97]; |
beaafb2e | 411 | char *p; |
f8e2fb7b LP |
412 | |
413 | if (w < 0 || w >= _INHIBIT_WHAT_MAX) | |
414 | return NULL; | |
415 | ||
beaafb2e LP |
416 | p = buffer; |
417 | if (w & INHIBIT_SHUTDOWN) | |
418 | p = stpcpy(p, "shutdown:"); | |
419 | if (w & INHIBIT_SLEEP) | |
420 | p = stpcpy(p, "sleep:"); | |
421 | if (w & INHIBIT_IDLE) | |
422 | p = stpcpy(p, "idle:"); | |
423 | if (w & INHIBIT_HANDLE_POWER_KEY) | |
424 | p = stpcpy(p, "handle-power-key:"); | |
8e7fd6ad LP |
425 | if (w & INHIBIT_HANDLE_SUSPEND_KEY) |
426 | p = stpcpy(p, "handle-suspend-key:"); | |
427 | if (w & INHIBIT_HANDLE_HIBERNATE_KEY) | |
428 | p = stpcpy(p, "handle-hibernate-key:"); | |
beaafb2e LP |
429 | if (w & INHIBIT_HANDLE_LID_SWITCH) |
430 | p = stpcpy(p, "handle-lid-switch:"); | |
431 | ||
432 | if (p > buffer) | |
433 | *(p-1) = 0; | |
434 | else | |
435 | *p = 0; | |
436 | ||
437 | return buffer; | |
f8e2fb7b LP |
438 | } |
439 | ||
440 | InhibitWhat inhibit_what_from_string(const char *s) { | |
441 | InhibitWhat what = 0; | |
442 | char *w, *state; | |
443 | size_t l; | |
444 | ||
445 | FOREACH_WORD_SEPARATOR(w, l, s, ":", state) { | |
641906e9 | 446 | if (l == 8 && strneq(w, "shutdown", l)) |
f8e2fb7b | 447 | what |= INHIBIT_SHUTDOWN; |
641906e9 | 448 | else if (l == 5 && strneq(w, "sleep", l)) |
4943c1c9 | 449 | what |= INHIBIT_SLEEP; |
641906e9 | 450 | else if (l == 4 && strneq(w, "idle", l)) |
f8e2fb7b | 451 | what |= INHIBIT_IDLE; |
641906e9 | 452 | else if (l == 16 && strneq(w, "handle-power-key", l)) |
beaafb2e | 453 | what |= INHIBIT_HANDLE_POWER_KEY; |
641906e9 | 454 | else if (l == 18 && strneq(w, "handle-suspend-key", l)) |
8e7fd6ad | 455 | what |= INHIBIT_HANDLE_SUSPEND_KEY; |
641906e9 | 456 | else if (l == 20 && strneq(w, "handle-hibernate-key", l)) |
8e7fd6ad | 457 | what |= INHIBIT_HANDLE_HIBERNATE_KEY; |
641906e9 | 458 | else if (l == 17 && strneq(w, "handle-lid-switch", l)) |
beaafb2e | 459 | what |= INHIBIT_HANDLE_LID_SWITCH; |
f8e2fb7b LP |
460 | else |
461 | return _INHIBIT_WHAT_INVALID; | |
462 | } | |
463 | ||
464 | return what; | |
f8e2fb7b | 465 | } |
eecd1362 LP |
466 | |
467 | static const char* const inhibit_mode_table[_INHIBIT_MODE_MAX] = { | |
468 | [INHIBIT_BLOCK] = "block", | |
469 | [INHIBIT_DELAY] = "delay" | |
470 | }; | |
471 | ||
472 | DEFINE_STRING_TABLE_LOOKUP(inhibit_mode, InhibitMode); |