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Commit | Line | Data |
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3990f247 LP |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2013 Lennart Poettering | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
d35c1bb1 LP |
20 | #include <linux/rfkill.h> |
21 | #include <poll.h> | |
22 | ||
b4bbcaa9 | 23 | #include "libudev.h" |
d35c1bb1 LP |
24 | #include "sd-daemon.h" |
25 | ||
b5efdb8a | 26 | #include "alloc-util.h" |
4f5dd394 | 27 | #include "escape.h" |
3ffd4af2 | 28 | #include "fd-util.h" |
d35c1bb1 | 29 | #include "fileio.h" |
c004493c | 30 | #include "io-util.h" |
d35c1bb1 | 31 | #include "mkdir.h" |
6bedfcbb | 32 | #include "parse-util.h" |
4e731273 | 33 | #include "proc-cmdline.h" |
8b43440b | 34 | #include "string-table.h" |
07630cea | 35 | #include "string-util.h" |
3990f247 | 36 | #include "udev-util.h" |
d35c1bb1 | 37 | #include "util.h" |
202cb8c3 | 38 | #include "list.h" |
3990f247 | 39 | |
202cb8c3 BB |
40 | /* Note that any write is delayed until exit and the rfkill state will not be |
41 | * stored for rfkill indices that disappear after a change. */ | |
d35c1bb1 | 42 | #define EXIT_USEC (5 * USEC_PER_SEC) |
3990f247 | 43 | |
202cb8c3 BB |
44 | typedef struct write_queue_item { |
45 | LIST_FIELDS(struct write_queue_item, queue); | |
46 | int rfkill_idx; | |
47 | char *file; | |
48 | int state; | |
49 | } write_queue_item; | |
50 | ||
51 | static void write_queue_item_free(struct write_queue_item *item) | |
52 | { | |
53 | assert(item); | |
54 | ||
55 | free(item->file); | |
56 | free(item); | |
57 | } | |
58 | ||
d35c1bb1 LP |
59 | static const char* const rfkill_type_table[NUM_RFKILL_TYPES] = { |
60 | [RFKILL_TYPE_ALL] = "all", | |
61 | [RFKILL_TYPE_WLAN] = "wlan", | |
62 | [RFKILL_TYPE_BLUETOOTH] = "bluetooth", | |
63 | [RFKILL_TYPE_UWB] = "uwb", | |
64 | [RFKILL_TYPE_WIMAX] = "wimax", | |
65 | [RFKILL_TYPE_WWAN] = "wwan", | |
66 | [RFKILL_TYPE_GPS] = "gps", | |
ac9455ef TA |
67 | [RFKILL_TYPE_FM] = "fm", |
68 | [RFKILL_TYPE_NFC] = "nfc", | |
d35c1bb1 | 69 | }; |
3990f247 | 70 | |
d35c1bb1 | 71 | DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(rfkill_type, int); |
3990f247 | 72 | |
d35c1bb1 LP |
73 | static int find_device( |
74 | struct udev *udev, | |
75 | const struct rfkill_event *event, | |
76 | struct udev_device **ret) { | |
3990f247 | 77 | |
d35c1bb1 LP |
78 | _cleanup_free_ char *sysname = NULL; |
79 | struct udev_device *device; | |
80 | const char *name; | |
3990f247 | 81 | |
d35c1bb1 LP |
82 | assert(udev); |
83 | assert(event); | |
84 | assert(ret); | |
3990f247 | 85 | |
d35c1bb1 LP |
86 | if (asprintf(&sysname, "rfkill%i", event->idx) < 0) |
87 | return log_oom(); | |
88 | ||
89 | device = udev_device_new_from_subsystem_sysname(udev, "rfkill", sysname); | |
90 | if (!device) | |
91 | return log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_ERR, errno, "Failed to open device: %m"); | |
3990f247 LP |
92 | |
93 | name = udev_device_get_sysattr_value(device, "name"); | |
94 | if (!name) { | |
d35c1bb1 LP |
95 | log_debug("Device has no name, ignoring."); |
96 | udev_device_unref(device); | |
97 | return -ENOENT; | |
4844262f LP |
98 | } |
99 | ||
100 | log_debug("Operating on rfkill device '%s'.", name); | |
101 | ||
d35c1bb1 LP |
102 | *ret = device; |
103 | return 0; | |
104 | } | |
105 | ||
106 | static int wait_for_initialized( | |
107 | struct udev *udev, | |
108 | struct udev_device *device, | |
109 | struct udev_device **ret) { | |
110 | ||
111 | _cleanup_udev_monitor_unref_ struct udev_monitor *monitor = NULL; | |
112 | struct udev_device *d; | |
113 | const char *sysname; | |
114 | int watch_fd, r; | |
115 | ||
116 | assert(udev); | |
117 | assert(device); | |
118 | assert(ret); | |
119 | ||
120 | if (udev_device_get_is_initialized(device) != 0) { | |
121 | *ret = udev_device_ref(device); | |
122 | return 0; | |
3990f247 LP |
123 | } |
124 | ||
d35c1bb1 LP |
125 | assert_se(sysname = udev_device_get_sysname(device)); |
126 | ||
127 | /* Wait until the device is initialized, so that we can get | |
128 | * access to the ID_PATH property */ | |
129 | ||
130 | monitor = udev_monitor_new_from_netlink(udev, "udev"); | |
131 | if (!monitor) | |
132 | return log_error_errno(errno, "Failed to acquire monitor: %m"); | |
133 | ||
134 | r = udev_monitor_filter_add_match_subsystem_devtype(monitor, "rfkill", NULL); | |
135 | if (r < 0) | |
136 | return log_error_errno(r, "Failed to add rfkill udev match to monitor: %m"); | |
137 | ||
138 | r = udev_monitor_enable_receiving(monitor); | |
139 | if (r < 0) | |
140 | return log_error_errno(r, "Failed to enable udev receiving: %m"); | |
141 | ||
142 | watch_fd = udev_monitor_get_fd(monitor); | |
143 | if (watch_fd < 0) | |
144 | return log_error_errno(watch_fd, "Failed to get watch fd: %m"); | |
145 | ||
146 | /* Check again, maybe things changed */ | |
147 | d = udev_device_new_from_subsystem_sysname(udev, "rfkill", sysname); | |
148 | if (!d) | |
149 | return log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_ERR, errno, "Failed to open device: %m"); | |
150 | ||
151 | if (udev_device_get_is_initialized(d) != 0) { | |
152 | *ret = d; | |
153 | return 0; | |
154 | } | |
155 | ||
156 | for (;;) { | |
157 | _cleanup_udev_device_unref_ struct udev_device *t = NULL; | |
158 | ||
8ec1a079 | 159 | r = fd_wait_for_event(watch_fd, POLLIN, EXIT_USEC); |
d35c1bb1 LP |
160 | if (r == -EINTR) |
161 | continue; | |
162 | if (r < 0) | |
163 | return log_error_errno(r, "Failed to watch udev monitor: %m"); | |
8ec1a079 | 164 | if (r == 0) { |
c7f6ca93 | 165 | log_error("Timed out waiting for udev monitor."); |
8ec1a079 F |
166 | return -ETIMEDOUT; |
167 | } | |
d35c1bb1 LP |
168 | |
169 | t = udev_monitor_receive_device(monitor); | |
170 | if (!t) | |
171 | continue; | |
172 | ||
8ec1a079 | 173 | if (streq_ptr(udev_device_get_sysname(t), sysname)) { |
d35c1bb1 LP |
174 | *ret = udev_device_ref(t); |
175 | return 0; | |
176 | } | |
3990f247 | 177 | } |
d35c1bb1 LP |
178 | } |
179 | ||
180 | static int determine_state_file( | |
181 | struct udev *udev, | |
182 | const struct rfkill_event *event, | |
d35c1bb1 LP |
183 | char **ret) { |
184 | ||
8e707663 | 185 | _cleanup_udev_device_unref_ struct udev_device *d = NULL; |
d35c1bb1 LP |
186 | _cleanup_udev_device_unref_ struct udev_device *device = NULL; |
187 | const char *path_id, *type; | |
188 | char *state_file; | |
189 | int r; | |
190 | ||
191 | assert(event); | |
d35c1bb1 LP |
192 | assert(ret); |
193 | ||
8e707663 BB |
194 | r = find_device(udev, event, &d); |
195 | if (r < 0) | |
196 | return r; | |
197 | ||
d35c1bb1 LP |
198 | r = wait_for_initialized(udev, d, &device); |
199 | if (r < 0) | |
200 | return r; | |
201 | ||
202 | assert_se(type = rfkill_type_to_string(event->type)); | |
3990f247 | 203 | |
f6f738db LP |
204 | path_id = udev_device_get_property_value(device, "ID_PATH"); |
205 | if (path_id) { | |
d35c1bb1 LP |
206 | _cleanup_free_ char *escaped_path_id = NULL; |
207 | ||
f6f738db | 208 | escaped_path_id = cescape(path_id); |
d35c1bb1 LP |
209 | if (!escaped_path_id) |
210 | return log_oom(); | |
f6f738db | 211 | |
605405c6 | 212 | state_file = strjoin("/var/lib/systemd/rfkill/", escaped_path_id, ":", type); |
f6f738db | 213 | } else |
605405c6 | 214 | state_file = strjoin("/var/lib/systemd/rfkill/", type); |
d35c1bb1 LP |
215 | |
216 | if (!state_file) | |
217 | return log_oom(); | |
218 | ||
219 | *ret = state_file; | |
220 | return 0; | |
221 | } | |
222 | ||
223 | static int load_state( | |
224 | int rfkill_fd, | |
225 | struct udev *udev, | |
226 | const struct rfkill_event *event) { | |
227 | ||
d35c1bb1 LP |
228 | _cleanup_free_ char *state_file = NULL, *value = NULL; |
229 | struct rfkill_event we; | |
230 | ssize_t l; | |
231 | int b, r; | |
f6f738db | 232 | |
d35c1bb1 LP |
233 | assert(rfkill_fd >= 0); |
234 | assert(udev); | |
235 | assert(event); | |
236 | ||
934ae16b | 237 | if (shall_restore_state() == 0) |
d35c1bb1 LP |
238 | return 0; |
239 | ||
8e707663 | 240 | r = determine_state_file(udev, event, &state_file); |
d35c1bb1 LP |
241 | if (r < 0) |
242 | return r; | |
243 | ||
244 | r = read_one_line_file(state_file, &value); | |
245 | if (r == -ENOENT) { | |
246 | /* No state file? Then save the current state */ | |
247 | ||
248 | r = write_string_file(state_file, one_zero(event->soft), WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_ATOMIC); | |
249 | if (r < 0) | |
250 | return log_error_errno(r, "Failed to write state file %s: %m", state_file); | |
251 | ||
252 | log_debug("Saved state '%s' to %s.", one_zero(event->soft), state_file); | |
253 | return 0; | |
254 | } | |
255 | if (r < 0) | |
256 | return log_error_errno(r, "Failed to read state file %s: %m", state_file); | |
257 | ||
258 | b = parse_boolean(value); | |
259 | if (b < 0) | |
260 | return log_error_errno(b, "Failed to parse state file %s: %m", state_file); | |
261 | ||
262 | we = (struct rfkill_event) { | |
263 | .op = RFKILL_OP_CHANGE, | |
264 | .idx = event->idx, | |
265 | .soft = b, | |
266 | }; | |
267 | ||
268 | l = write(rfkill_fd, &we, sizeof(we)); | |
269 | if (l < 0) | |
270 | return log_error_errno(errno, "Failed to restore rfkill state for %i: %m", event->idx); | |
271 | if (l != sizeof(we)) { | |
272 | log_error("Couldn't write rfkill event structure, too short."); | |
273 | return -EIO; | |
274 | } | |
275 | ||
276 | log_debug("Loaded state '%s' from %s.", one_zero(b), state_file); | |
277 | return 0; | |
278 | } | |
279 | ||
202cb8c3 BB |
280 | static void save_state_queue_remove( |
281 | struct write_queue_item **write_queue, | |
282 | int idx, | |
283 | char *state_file) { | |
284 | ||
285 | struct write_queue_item *item, *tmp; | |
286 | ||
287 | LIST_FOREACH_SAFE(queue, item, tmp, *write_queue) { | |
288 | if ((state_file && streq(item->file, state_file)) || idx == item->rfkill_idx) { | |
289 | log_debug("Canceled previous save state of '%s' to %s.", one_zero(item->state), item->file); | |
290 | LIST_REMOVE(queue, *write_queue, item); | |
291 | write_queue_item_free(item); | |
292 | } | |
293 | } | |
294 | } | |
295 | ||
296 | static int save_state_queue( | |
297 | struct write_queue_item **write_queue, | |
d35c1bb1 LP |
298 | int rfkill_fd, |
299 | struct udev *udev, | |
300 | const struct rfkill_event *event) { | |
301 | ||
d35c1bb1 | 302 | _cleanup_free_ char *state_file = NULL; |
202cb8c3 | 303 | struct write_queue_item *item; |
d35c1bb1 LP |
304 | int r; |
305 | ||
306 | assert(rfkill_fd >= 0); | |
307 | assert(udev); | |
308 | assert(event); | |
309 | ||
8e707663 | 310 | r = determine_state_file(udev, event, &state_file); |
d35c1bb1 LP |
311 | if (r < 0) |
312 | return r; | |
202cb8c3 | 313 | save_state_queue_remove(write_queue, event->idx, state_file); |
d35c1bb1 | 314 | |
202cb8c3 BB |
315 | item = new0(struct write_queue_item, 1); |
316 | if (!item) | |
317 | return -ENOMEM; | |
318 | ||
319 | item->file = state_file; | |
320 | item->rfkill_idx = event->idx; | |
321 | item->state = event->soft; | |
322 | state_file = NULL; | |
323 | ||
324 | LIST_APPEND(queue, *write_queue, item); | |
325 | ||
326 | return 0; | |
327 | } | |
328 | ||
329 | static int save_state_cancel( | |
330 | struct write_queue_item **write_queue, | |
331 | int rfkill_fd, | |
332 | struct udev *udev, | |
333 | const struct rfkill_event *event) { | |
334 | ||
335 | _cleanup_free_ char *state_file = NULL; | |
336 | int r; | |
337 | ||
338 | assert(rfkill_fd >= 0); | |
339 | assert(udev); | |
340 | assert(event); | |
341 | ||
342 | r = determine_state_file(udev, event, &state_file); | |
343 | save_state_queue_remove(write_queue, event->idx, state_file); | |
d35c1bb1 | 344 | if (r < 0) |
202cb8c3 | 345 | return r; |
d35c1bb1 | 346 | |
d35c1bb1 LP |
347 | return 0; |
348 | } | |
349 | ||
202cb8c3 BB |
350 | static int save_state_write(struct write_queue_item **write_queue) { |
351 | struct write_queue_item *item, *tmp; | |
352 | int result = 0; | |
353 | bool error_logged = false; | |
354 | int r; | |
355 | ||
356 | LIST_FOREACH_SAFE(queue, item, tmp, *write_queue) { | |
357 | r = write_string_file(item->file, one_zero(item->state), WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_ATOMIC); | |
358 | if (r < 0) { | |
359 | result = r; | |
360 | if (!error_logged) { | |
361 | log_error_errno(r, "Failed to write state file %s: %m", item->file); | |
362 | error_logged = true; | |
363 | } else | |
364 | log_warning_errno(r, "Failed to write state file %s: %m", item->file); | |
365 | } else | |
366 | log_debug("Saved state '%s' to %s.", one_zero(item->state), item->file); | |
367 | ||
368 | LIST_REMOVE(queue, *write_queue, item); | |
369 | write_queue_item_free(item); | |
370 | } | |
371 | return result; | |
372 | } | |
373 | ||
d35c1bb1 | 374 | int main(int argc, char *argv[]) { |
202cb8c3 | 375 | LIST_HEAD(write_queue_item, write_queue); |
d35c1bb1 LP |
376 | _cleanup_udev_unref_ struct udev *udev = NULL; |
377 | _cleanup_close_ int rfkill_fd = -1; | |
378 | bool ready = false; | |
379 | int r, n; | |
380 | ||
381 | if (argc > 1) { | |
382 | log_error("This program requires no arguments."); | |
3990f247 LP |
383 | return EXIT_FAILURE; |
384 | } | |
385 | ||
202cb8c3 BB |
386 | LIST_HEAD_INIT(write_queue); |
387 | ||
d35c1bb1 LP |
388 | log_set_target(LOG_TARGET_AUTO); |
389 | log_parse_environment(); | |
390 | log_open(); | |
3990f247 | 391 | |
d35c1bb1 | 392 | umask(0022); |
354806fb | 393 | |
d35c1bb1 LP |
394 | udev = udev_new(); |
395 | if (!udev) { | |
396 | r = log_oom(); | |
397 | goto finish; | |
398 | } | |
399 | ||
400 | r = mkdir_p("/var/lib/systemd/rfkill", 0755); | |
401 | if (r < 0) { | |
402 | log_error_errno(r, "Failed to create rfkill directory: %m"); | |
403 | goto finish; | |
404 | } | |
405 | ||
406 | n = sd_listen_fds(false); | |
407 | if (n < 0) { | |
408 | r = log_error_errno(n, "Failed to determine whether we got any file descriptors passed: %m"); | |
409 | goto finish; | |
410 | } | |
411 | if (n > 1) { | |
412 | log_error("Got too many file descriptors."); | |
413 | r = -EINVAL; | |
414 | goto finish; | |
415 | } | |
416 | ||
417 | if (n == 0) { | |
418 | rfkill_fd = open("/dev/rfkill", O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK); | |
419 | if (rfkill_fd < 0) { | |
420 | if (errno == ENOENT) { | |
421 | log_debug_errno(errno, "Missing rfkill subsystem, or no device present, exiting."); | |
422 | r = 0; | |
423 | goto finish; | |
424 | } | |
425 | ||
426 | r = log_error_errno(errno, "Failed to open /dev/rfkill: %m"); | |
427 | goto finish; | |
3990f247 | 428 | } |
d35c1bb1 LP |
429 | } else { |
430 | rfkill_fd = SD_LISTEN_FDS_START; | |
3990f247 | 431 | |
d35c1bb1 | 432 | r = fd_nonblock(rfkill_fd, 1); |
3990f247 | 433 | if (r < 0) { |
d35c1bb1 LP |
434 | log_error_errno(r, "Failed to make /dev/rfkill socket non-blocking: %m"); |
435 | goto finish; | |
3990f247 | 436 | } |
d35c1bb1 LP |
437 | } |
438 | ||
439 | for (;;) { | |
440 | struct rfkill_event event; | |
441 | const char *type; | |
442 | ssize_t l; | |
3990f247 | 443 | |
d35c1bb1 LP |
444 | l = read(rfkill_fd, &event, sizeof(event)); |
445 | if (l < 0) { | |
446 | if (errno == EAGAIN) { | |
3990f247 | 447 | |
d35c1bb1 LP |
448 | if (!ready) { |
449 | /* Notify manager that we are | |
450 | * now finished with | |
451 | * processing whatever was | |
452 | * queued */ | |
453 | (void) sd_notify(false, "READY=1"); | |
454 | ready = true; | |
455 | } | |
456 | ||
457 | /* Hang around for a bit, maybe there's more coming */ | |
458 | ||
459 | r = fd_wait_for_event(rfkill_fd, POLLIN, EXIT_USEC); | |
460 | if (r == -EINTR) | |
461 | continue; | |
462 | if (r < 0) { | |
463 | log_error_errno(r, "Failed to poll() on device: %m"); | |
464 | goto finish; | |
465 | } | |
466 | if (r > 0) | |
467 | continue; | |
468 | ||
469 | log_debug("All events read and idle, exiting."); | |
470 | break; | |
471 | } | |
472 | ||
473 | log_error_errno(errno, "Failed to read from /dev/rfkill: %m"); | |
3990f247 LP |
474 | } |
475 | ||
d35c1bb1 LP |
476 | if (l != RFKILL_EVENT_SIZE_V1) { |
477 | log_error("Read event structure of invalid size."); | |
478 | r = -EIO; | |
479 | goto finish; | |
3990f247 LP |
480 | } |
481 | ||
d35c1bb1 LP |
482 | type = rfkill_type_to_string(event.type); |
483 | if (!type) { | |
484 | log_debug("An rfkill device of unknown type %i discovered, ignoring.", event.type); | |
485 | continue; | |
486 | } | |
487 | ||
488 | switch (event.op) { | |
489 | ||
490 | case RFKILL_OP_ADD: | |
491 | log_debug("A new rfkill device has been added with index %i and type %s.", event.idx, type); | |
492 | (void) load_state(rfkill_fd, udev, &event); | |
493 | break; | |
494 | ||
495 | case RFKILL_OP_DEL: | |
496 | log_debug("An rfkill device has been removed with index %i and type %s", event.idx, type); | |
202cb8c3 | 497 | (void) save_state_cancel(&write_queue, rfkill_fd, udev, &event); |
d35c1bb1 LP |
498 | break; |
499 | ||
500 | case RFKILL_OP_CHANGE: | |
501 | log_debug("An rfkill device has changed state with index %i and type %s", event.idx, type); | |
202cb8c3 | 502 | (void) save_state_queue(&write_queue, rfkill_fd, udev, &event); |
d35c1bb1 LP |
503 | break; |
504 | ||
505 | default: | |
506 | log_debug("Unknown event %i from /dev/rfkill for index %i and type %s, ignoring.", event.op, event.idx, type); | |
507 | break; | |
508 | } | |
3990f247 LP |
509 | } |
510 | ||
d35c1bb1 LP |
511 | r = 0; |
512 | ||
513 | finish: | |
202cb8c3 BB |
514 | (void) save_state_write(&write_queue); |
515 | ||
d35c1bb1 | 516 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
3990f247 | 517 | } |