Line data Source code
1 : /* SPDX-License-Identifier: LGPL-2.1+ */
2 :
3 : #include <errno.h>
4 : #include <fcntl.h>
5 : #include <string.h>
6 : #include <sys/stat.h>
7 : #include <sys/types.h>
8 : #include <unistd.h>
9 :
10 : #include "alloc-util.h"
11 : #include "env-file.h"
12 : #include "escape.h"
13 : #include "fd-util.h"
14 : #include "fileio.h"
15 : #include "format-util.h"
16 : #include "io-util.h"
17 : #include "logind-dbus.h"
18 : #include "logind-inhibit.h"
19 : #include "mkdir.h"
20 : #include "parse-util.h"
21 : #include "path-util.h"
22 : #include "string-table.h"
23 : #include "string-util.h"
24 : #include "tmpfile-util.h"
25 : #include "user-util.h"
26 : #include "util.h"
27 :
28 : static void inhibitor_remove_fifo(Inhibitor *i);
29 :
30 0 : int inhibitor_new(Inhibitor **ret, Manager *m, const char* id) {
31 0 : _cleanup_(inhibitor_freep) Inhibitor *i = NULL;
32 : int r;
33 :
34 0 : assert(ret);
35 0 : assert(m);
36 0 : assert(id);
37 :
38 0 : i = new(Inhibitor, 1);
39 0 : if (!i)
40 0 : return -ENOMEM;
41 :
42 0 : *i = (Inhibitor) {
43 : .manager = m,
44 : .what = _INHIBIT_WHAT_INVALID,
45 : .mode = _INHIBIT_MODE_INVALID,
46 : .uid = UID_INVALID,
47 : .fifo_fd = -1,
48 : };
49 :
50 0 : i->state_file = path_join("/run/systemd/inhibit", id);
51 0 : if (!i->state_file)
52 0 : return -ENOMEM;
53 :
54 0 : i->id = basename(i->state_file);
55 :
56 0 : r = hashmap_put(m->inhibitors, i->id, i);
57 0 : if (r < 0)
58 0 : return r;
59 :
60 0 : *ret = TAKE_PTR(i);
61 0 : return 0;
62 : }
63 :
64 0 : Inhibitor* inhibitor_free(Inhibitor *i) {
65 :
66 0 : if (!i)
67 0 : return NULL;
68 :
69 0 : free(i->who);
70 0 : free(i->why);
71 :
72 0 : sd_event_source_unref(i->event_source);
73 0 : safe_close(i->fifo_fd);
74 :
75 : /* Note that we don't remove neither the state file nor the fifo path here, since we want both to
76 : * survive daemon restarts */
77 0 : free(i->state_file);
78 0 : free(i->fifo_path);
79 :
80 0 : hashmap_remove(i->manager->inhibitors, i->id);
81 :
82 0 : return mfree(i);
83 : }
84 :
85 0 : static int inhibitor_save(Inhibitor *i) {
86 0 : _cleanup_free_ char *temp_path = NULL;
87 0 : _cleanup_fclose_ FILE *f = NULL;
88 : int r;
89 :
90 0 : assert(i);
91 :
92 0 : r = mkdir_safe_label("/run/systemd/inhibit", 0755, 0, 0, MKDIR_WARN_MODE);
93 0 : if (r < 0)
94 0 : goto fail;
95 :
96 0 : r = fopen_temporary(i->state_file, &f, &temp_path);
97 0 : if (r < 0)
98 0 : goto fail;
99 :
100 0 : (void) fchmod(fileno(f), 0644);
101 :
102 0 : fprintf(f,
103 : "# This is private data. Do not parse.\n"
104 : "WHAT=%s\n"
105 : "MODE=%s\n"
106 : "UID="UID_FMT"\n"
107 : "PID="PID_FMT"\n",
108 : inhibit_what_to_string(i->what),
109 : inhibit_mode_to_string(i->mode),
110 : i->uid,
111 : i->pid);
112 :
113 0 : if (i->who) {
114 0 : _cleanup_free_ char *cc = NULL;
115 :
116 0 : cc = cescape(i->who);
117 0 : if (!cc) {
118 0 : r = -ENOMEM;
119 0 : goto fail;
120 : }
121 :
122 0 : fprintf(f, "WHO=%s\n", cc);
123 : }
124 :
125 0 : if (i->why) {
126 0 : _cleanup_free_ char *cc = NULL;
127 :
128 0 : cc = cescape(i->why);
129 0 : if (!cc) {
130 0 : r = -ENOMEM;
131 0 : goto fail;
132 : }
133 :
134 0 : fprintf(f, "WHY=%s\n", cc);
135 : }
136 :
137 0 : if (i->fifo_path)
138 0 : fprintf(f, "FIFO=%s\n", i->fifo_path);
139 :
140 0 : r = fflush_and_check(f);
141 0 : if (r < 0)
142 0 : goto fail;
143 :
144 0 : if (rename(temp_path, i->state_file) < 0) {
145 0 : r = -errno;
146 0 : goto fail;
147 : }
148 :
149 0 : return 0;
150 :
151 0 : fail:
152 0 : (void) unlink(i->state_file);
153 :
154 0 : if (temp_path)
155 0 : (void) unlink(temp_path);
156 :
157 0 : return log_error_errno(r, "Failed to save inhibit data %s: %m", i->state_file);
158 : }
159 :
160 0 : static int bus_manager_send_inhibited_change(Inhibitor *i) {
161 : const char *property;
162 :
163 0 : assert(i);
164 :
165 0 : property = i->mode == INHIBIT_BLOCK ? "BlockInhibited" : "DelayInhibited";
166 :
167 0 : return manager_send_changed(i->manager, property, NULL);
168 : }
169 :
170 0 : int inhibitor_start(Inhibitor *i) {
171 0 : assert(i);
172 :
173 0 : if (i->started)
174 0 : return 0;
175 :
176 0 : dual_timestamp_get(&i->since);
177 :
178 0 : log_debug("Inhibitor %s (%s) pid="PID_FMT" uid="UID_FMT" mode=%s started.",
179 : strna(i->who), strna(i->why),
180 : i->pid, i->uid,
181 : inhibit_mode_to_string(i->mode));
182 :
183 0 : i->started = true;
184 :
185 0 : inhibitor_save(i);
186 :
187 0 : bus_manager_send_inhibited_change(i);
188 :
189 0 : return 0;
190 : }
191 :
192 0 : void inhibitor_stop(Inhibitor *i) {
193 0 : assert(i);
194 :
195 0 : if (i->started)
196 0 : log_debug("Inhibitor %s (%s) pid="PID_FMT" uid="UID_FMT" mode=%s stopped.",
197 : strna(i->who), strna(i->why),
198 : i->pid, i->uid,
199 : inhibit_mode_to_string(i->mode));
200 :
201 0 : inhibitor_remove_fifo(i);
202 :
203 0 : if (i->state_file)
204 0 : (void) unlink(i->state_file);
205 :
206 0 : i->started = false;
207 :
208 0 : bus_manager_send_inhibited_change(i);
209 0 : }
210 :
211 0 : int inhibitor_load(Inhibitor *i) {
212 :
213 : _cleanup_free_ char
214 0 : *what = NULL,
215 0 : *uid = NULL,
216 0 : *pid = NULL,
217 0 : *who = NULL,
218 0 : *why = NULL,
219 0 : *mode = NULL;
220 :
221 : InhibitWhat w;
222 : InhibitMode mm;
223 : char *cc;
224 : int r;
225 :
226 0 : r = parse_env_file(NULL, i->state_file,
227 : "WHAT", &what,
228 : "UID", &uid,
229 : "PID", &pid,
230 : "WHO", &who,
231 : "WHY", &why,
232 : "MODE", &mode,
233 : "FIFO", &i->fifo_path);
234 0 : if (r < 0)
235 0 : return log_error_errno(r, "Failed to read %s: %m", i->state_file);
236 :
237 0 : w = what ? inhibit_what_from_string(what) : 0;
238 0 : if (w >= 0)
239 0 : i->what = w;
240 :
241 0 : mm = mode ? inhibit_mode_from_string(mode) : INHIBIT_BLOCK;
242 0 : if (mm >= 0)
243 0 : i->mode = mm;
244 :
245 0 : if (uid) {
246 0 : r = parse_uid(uid, &i->uid);
247 0 : if (r < 0)
248 0 : log_debug_errno(r, "Failed to parse UID of inhibitor: %s", uid);
249 : }
250 :
251 0 : if (pid) {
252 0 : r = parse_pid(pid, &i->pid);
253 0 : if (r < 0)
254 0 : log_debug_errno(r, "Failed to parse PID of inhibitor: %s", pid);
255 : }
256 :
257 0 : if (who) {
258 0 : r = cunescape(who, 0, &cc);
259 0 : if (r < 0)
260 0 : return log_oom();
261 :
262 0 : free_and_replace(i->who, cc);
263 : }
264 :
265 0 : if (why) {
266 0 : r = cunescape(why, 0, &cc);
267 0 : if (r < 0)
268 0 : return log_oom();
269 :
270 0 : free_and_replace(i->why, cc);
271 : }
272 :
273 0 : if (i->fifo_path) {
274 0 : _cleanup_close_ int fd = -1;
275 :
276 : /* Let's re-open the FIFO on both sides, and close the writing side right away */
277 0 : fd = inhibitor_create_fifo(i);
278 0 : if (fd < 0)
279 0 : return log_error_errno(fd, "Failed to reopen FIFO: %m");
280 : }
281 :
282 0 : return 0;
283 : }
284 :
285 0 : static int inhibitor_dispatch_fifo(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
286 0 : Inhibitor *i = userdata;
287 :
288 0 : assert(s);
289 0 : assert(fd == i->fifo_fd);
290 0 : assert(i);
291 :
292 0 : inhibitor_stop(i);
293 0 : inhibitor_free(i);
294 :
295 0 : return 0;
296 : }
297 :
298 0 : int inhibitor_create_fifo(Inhibitor *i) {
299 : int r;
300 :
301 0 : assert(i);
302 :
303 : /* Create FIFO */
304 0 : if (!i->fifo_path) {
305 0 : r = mkdir_safe_label("/run/systemd/inhibit", 0755, 0, 0, MKDIR_WARN_MODE);
306 0 : if (r < 0)
307 0 : return r;
308 :
309 0 : i->fifo_path = strjoin("/run/systemd/inhibit/", i->id, ".ref");
310 0 : if (!i->fifo_path)
311 0 : return -ENOMEM;
312 :
313 0 : if (mkfifo(i->fifo_path, 0600) < 0 && errno != EEXIST)
314 0 : return -errno;
315 : }
316 :
317 : /* Open reading side */
318 0 : if (i->fifo_fd < 0) {
319 0 : i->fifo_fd = open(i->fifo_path, O_RDONLY|O_CLOEXEC|O_NONBLOCK);
320 0 : if (i->fifo_fd < 0)
321 0 : return -errno;
322 : }
323 :
324 0 : if (!i->event_source) {
325 0 : r = sd_event_add_io(i->manager->event, &i->event_source, i->fifo_fd, 0, inhibitor_dispatch_fifo, i);
326 0 : if (r < 0)
327 0 : return r;
328 :
329 0 : r = sd_event_source_set_priority(i->event_source, SD_EVENT_PRIORITY_IDLE-10);
330 0 : if (r < 0)
331 0 : return r;
332 :
333 0 : (void) sd_event_source_set_description(i->event_source, "inhibitor-ref");
334 : }
335 :
336 : /* Open writing side */
337 0 : r = open(i->fifo_path, O_WRONLY|O_CLOEXEC|O_NONBLOCK);
338 0 : if (r < 0)
339 0 : return -errno;
340 :
341 0 : return r;
342 : }
343 :
344 0 : static void inhibitor_remove_fifo(Inhibitor *i) {
345 0 : assert(i);
346 :
347 0 : i->event_source = sd_event_source_unref(i->event_source);
348 0 : i->fifo_fd = safe_close(i->fifo_fd);
349 :
350 0 : if (i->fifo_path) {
351 0 : (void) unlink(i->fifo_path);
352 0 : i->fifo_path = mfree(i->fifo_path);
353 : }
354 0 : }
355 :
356 0 : bool inhibitor_is_orphan(Inhibitor *i) {
357 0 : assert(i);
358 :
359 0 : if (!i->started)
360 0 : return true;
361 :
362 0 : if (!i->fifo_path)
363 0 : return true;
364 :
365 0 : if (i->fifo_fd < 0)
366 0 : return true;
367 :
368 0 : if (pipe_eof(i->fifo_fd) != 0)
369 0 : return true;
370 :
371 0 : return false;
372 : }
373 :
374 0 : InhibitWhat manager_inhibit_what(Manager *m, InhibitMode mm) {
375 : Inhibitor *i;
376 : Iterator j;
377 0 : InhibitWhat what = 0;
378 :
379 0 : assert(m);
380 :
381 0 : HASHMAP_FOREACH(i, m->inhibitors, j)
382 0 : if (i->mode == mm && i->started)
383 0 : what |= i->what;
384 :
385 0 : return what;
386 : }
387 :
388 0 : static int pid_is_active(Manager *m, pid_t pid) {
389 : Session *s;
390 : int r;
391 :
392 : /* Get client session. This is not what you are looking for these days.
393 : * FIXME #6852 */
394 0 : r = manager_get_session_by_pid(m, pid, &s);
395 0 : if (r < 0)
396 0 : return r;
397 :
398 : /* If there's no session assigned to it, then it's globally
399 : * active on all ttys */
400 0 : if (r == 0)
401 0 : return 1;
402 :
403 0 : return session_is_active(s);
404 : }
405 :
406 0 : bool manager_is_inhibited(
407 : Manager *m,
408 : InhibitWhat w,
409 : InhibitMode mm,
410 : dual_timestamp *since,
411 : bool ignore_inactive,
412 : bool ignore_uid,
413 : uid_t uid,
414 : Inhibitor **offending) {
415 :
416 : Inhibitor *i;
417 : Iterator j;
418 0 : struct dual_timestamp ts = DUAL_TIMESTAMP_NULL;
419 0 : bool inhibited = false;
420 :
421 0 : assert(m);
422 0 : assert(w > 0 && w < _INHIBIT_WHAT_MAX);
423 :
424 0 : HASHMAP_FOREACH(i, m->inhibitors, j) {
425 0 : if (!i->started)
426 0 : continue;
427 :
428 0 : if (!(i->what & w))
429 0 : continue;
430 :
431 0 : if (i->mode != mm)
432 0 : continue;
433 :
434 0 : if (ignore_inactive && pid_is_active(m, i->pid) <= 0)
435 0 : continue;
436 :
437 0 : if (ignore_uid && i->uid == uid)
438 0 : continue;
439 :
440 0 : if (!inhibited ||
441 0 : i->since.monotonic < ts.monotonic)
442 0 : ts = i->since;
443 :
444 0 : inhibited = true;
445 :
446 0 : if (offending)
447 0 : *offending = i;
448 : }
449 :
450 0 : if (since)
451 0 : *since = ts;
452 :
453 0 : return inhibited;
454 : }
455 :
456 0 : const char *inhibit_what_to_string(InhibitWhat w) {
457 : static thread_local char buffer[97];
458 : char *p;
459 :
460 0 : if (w < 0 || w >= _INHIBIT_WHAT_MAX)
461 0 : return NULL;
462 :
463 0 : p = buffer;
464 0 : if (w & INHIBIT_SHUTDOWN)
465 0 : p = stpcpy(p, "shutdown:");
466 0 : if (w & INHIBIT_SLEEP)
467 0 : p = stpcpy(p, "sleep:");
468 0 : if (w & INHIBIT_IDLE)
469 0 : p = stpcpy(p, "idle:");
470 0 : if (w & INHIBIT_HANDLE_POWER_KEY)
471 0 : p = stpcpy(p, "handle-power-key:");
472 0 : if (w & INHIBIT_HANDLE_SUSPEND_KEY)
473 0 : p = stpcpy(p, "handle-suspend-key:");
474 0 : if (w & INHIBIT_HANDLE_HIBERNATE_KEY)
475 0 : p = stpcpy(p, "handle-hibernate-key:");
476 0 : if (w & INHIBIT_HANDLE_LID_SWITCH)
477 0 : p = stpcpy(p, "handle-lid-switch:");
478 :
479 0 : if (p > buffer)
480 0 : *(p-1) = 0;
481 : else
482 0 : *p = 0;
483 :
484 0 : return buffer;
485 : }
486 :
487 0 : InhibitWhat inhibit_what_from_string(const char *s) {
488 0 : InhibitWhat what = 0;
489 : const char *word, *state;
490 : size_t l;
491 :
492 0 : FOREACH_WORD_SEPARATOR(word, l, s, ":", state) {
493 0 : if (l == 8 && strneq(word, "shutdown", l))
494 0 : what |= INHIBIT_SHUTDOWN;
495 0 : else if (l == 5 && strneq(word, "sleep", l))
496 0 : what |= INHIBIT_SLEEP;
497 0 : else if (l == 4 && strneq(word, "idle", l))
498 0 : what |= INHIBIT_IDLE;
499 0 : else if (l == 16 && strneq(word, "handle-power-key", l))
500 0 : what |= INHIBIT_HANDLE_POWER_KEY;
501 0 : else if (l == 18 && strneq(word, "handle-suspend-key", l))
502 0 : what |= INHIBIT_HANDLE_SUSPEND_KEY;
503 0 : else if (l == 20 && strneq(word, "handle-hibernate-key", l))
504 0 : what |= INHIBIT_HANDLE_HIBERNATE_KEY;
505 0 : else if (l == 17 && strneq(word, "handle-lid-switch", l))
506 0 : what |= INHIBIT_HANDLE_LID_SWITCH;
507 : else
508 0 : return _INHIBIT_WHAT_INVALID;
509 : }
510 :
511 0 : return what;
512 : }
513 :
514 : static const char* const inhibit_mode_table[_INHIBIT_MODE_MAX] = {
515 : [INHIBIT_BLOCK] = "block",
516 : [INHIBIT_DELAY] = "delay"
517 : };
518 :
519 8 : DEFINE_STRING_TABLE_LOOKUP(inhibit_mode, InhibitMode);
|
