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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
3990f247 LP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2013 Lennart Poettering | |
3990f247 LP |
6 | ***/ |
7 | ||
d35c1bb1 LP |
8 | #include <linux/rfkill.h> |
9 | #include <poll.h> | |
10 | ||
b4bbcaa9 | 11 | #include "libudev.h" |
d35c1bb1 LP |
12 | #include "sd-daemon.h" |
13 | ||
b5efdb8a | 14 | #include "alloc-util.h" |
4f5dd394 | 15 | #include "escape.h" |
3ffd4af2 | 16 | #include "fd-util.h" |
d35c1bb1 | 17 | #include "fileio.h" |
c004493c | 18 | #include "io-util.h" |
d35c1bb1 | 19 | #include "mkdir.h" |
6bedfcbb | 20 | #include "parse-util.h" |
4e731273 | 21 | #include "proc-cmdline.h" |
8b43440b | 22 | #include "string-table.h" |
07630cea | 23 | #include "string-util.h" |
3990f247 | 24 | #include "udev-util.h" |
d35c1bb1 | 25 | #include "util.h" |
202cb8c3 | 26 | #include "list.h" |
3990f247 | 27 | |
202cb8c3 BB |
28 | /* Note that any write is delayed until exit and the rfkill state will not be |
29 | * stored for rfkill indices that disappear after a change. */ | |
d35c1bb1 | 30 | #define EXIT_USEC (5 * USEC_PER_SEC) |
3990f247 | 31 | |
202cb8c3 BB |
32 | typedef struct write_queue_item { |
33 | LIST_FIELDS(struct write_queue_item, queue); | |
34 | int rfkill_idx; | |
35 | char *file; | |
36 | int state; | |
37 | } write_queue_item; | |
38 | ||
3b3d1737 LP |
39 | static struct write_queue_item* write_queue_item_free(struct write_queue_item *item) { |
40 | if (!item) | |
41 | return NULL; | |
202cb8c3 BB |
42 | |
43 | free(item->file); | |
3b3d1737 | 44 | return mfree(item); |
202cb8c3 BB |
45 | } |
46 | ||
d35c1bb1 LP |
47 | static const char* const rfkill_type_table[NUM_RFKILL_TYPES] = { |
48 | [RFKILL_TYPE_ALL] = "all", | |
49 | [RFKILL_TYPE_WLAN] = "wlan", | |
50 | [RFKILL_TYPE_BLUETOOTH] = "bluetooth", | |
51 | [RFKILL_TYPE_UWB] = "uwb", | |
52 | [RFKILL_TYPE_WIMAX] = "wimax", | |
53 | [RFKILL_TYPE_WWAN] = "wwan", | |
54 | [RFKILL_TYPE_GPS] = "gps", | |
ac9455ef TA |
55 | [RFKILL_TYPE_FM] = "fm", |
56 | [RFKILL_TYPE_NFC] = "nfc", | |
d35c1bb1 | 57 | }; |
3990f247 | 58 | |
d35c1bb1 | 59 | DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(rfkill_type, int); |
3990f247 | 60 | |
d35c1bb1 LP |
61 | static int find_device( |
62 | struct udev *udev, | |
63 | const struct rfkill_event *event, | |
64 | struct udev_device **ret) { | |
3990f247 | 65 | |
d35c1bb1 LP |
66 | _cleanup_free_ char *sysname = NULL; |
67 | struct udev_device *device; | |
68 | const char *name; | |
3990f247 | 69 | |
d35c1bb1 LP |
70 | assert(udev); |
71 | assert(event); | |
72 | assert(ret); | |
3990f247 | 73 | |
d35c1bb1 LP |
74 | if (asprintf(&sysname, "rfkill%i", event->idx) < 0) |
75 | return log_oom(); | |
76 | ||
77 | device = udev_device_new_from_subsystem_sysname(udev, "rfkill", sysname); | |
78 | if (!device) | |
bc5e002e LP |
79 | return log_full_errno(IN_SET(errno, ENOENT, ENXIO, ENODEV) ? LOG_DEBUG : LOG_ERR, errno, |
80 | "Failed to open device '%s': %m", sysname); | |
3990f247 LP |
81 | |
82 | name = udev_device_get_sysattr_value(device, "name"); | |
83 | if (!name) { | |
d35c1bb1 LP |
84 | log_debug("Device has no name, ignoring."); |
85 | udev_device_unref(device); | |
86 | return -ENOENT; | |
4844262f LP |
87 | } |
88 | ||
89 | log_debug("Operating on rfkill device '%s'.", name); | |
90 | ||
d35c1bb1 LP |
91 | *ret = device; |
92 | return 0; | |
93 | } | |
94 | ||
95 | static int wait_for_initialized( | |
96 | struct udev *udev, | |
97 | struct udev_device *device, | |
98 | struct udev_device **ret) { | |
99 | ||
100 | _cleanup_udev_monitor_unref_ struct udev_monitor *monitor = NULL; | |
101 | struct udev_device *d; | |
102 | const char *sysname; | |
103 | int watch_fd, r; | |
104 | ||
105 | assert(udev); | |
106 | assert(device); | |
107 | assert(ret); | |
108 | ||
109 | if (udev_device_get_is_initialized(device) != 0) { | |
110 | *ret = udev_device_ref(device); | |
111 | return 0; | |
3990f247 LP |
112 | } |
113 | ||
d35c1bb1 LP |
114 | assert_se(sysname = udev_device_get_sysname(device)); |
115 | ||
116 | /* Wait until the device is initialized, so that we can get | |
117 | * access to the ID_PATH property */ | |
118 | ||
119 | monitor = udev_monitor_new_from_netlink(udev, "udev"); | |
120 | if (!monitor) | |
121 | return log_error_errno(errno, "Failed to acquire monitor: %m"); | |
122 | ||
123 | r = udev_monitor_filter_add_match_subsystem_devtype(monitor, "rfkill", NULL); | |
124 | if (r < 0) | |
125 | return log_error_errno(r, "Failed to add rfkill udev match to monitor: %m"); | |
126 | ||
127 | r = udev_monitor_enable_receiving(monitor); | |
128 | if (r < 0) | |
129 | return log_error_errno(r, "Failed to enable udev receiving: %m"); | |
130 | ||
131 | watch_fd = udev_monitor_get_fd(monitor); | |
132 | if (watch_fd < 0) | |
133 | return log_error_errno(watch_fd, "Failed to get watch fd: %m"); | |
134 | ||
135 | /* Check again, maybe things changed */ | |
136 | d = udev_device_new_from_subsystem_sysname(udev, "rfkill", sysname); | |
137 | if (!d) | |
bc5e002e LP |
138 | return log_full_errno(IN_SET(errno, ENOENT, ENXIO, ENODEV) ? LOG_DEBUG : LOG_ERR, errno, |
139 | "Failed to open device '%s': %m", sysname); | |
d35c1bb1 LP |
140 | |
141 | if (udev_device_get_is_initialized(d) != 0) { | |
142 | *ret = d; | |
143 | return 0; | |
144 | } | |
145 | ||
146 | for (;;) { | |
147 | _cleanup_udev_device_unref_ struct udev_device *t = NULL; | |
148 | ||
8ec1a079 | 149 | r = fd_wait_for_event(watch_fd, POLLIN, EXIT_USEC); |
d35c1bb1 LP |
150 | if (r == -EINTR) |
151 | continue; | |
152 | if (r < 0) | |
153 | return log_error_errno(r, "Failed to watch udev monitor: %m"); | |
8ec1a079 | 154 | if (r == 0) { |
c7f6ca93 | 155 | log_error("Timed out waiting for udev monitor."); |
8ec1a079 F |
156 | return -ETIMEDOUT; |
157 | } | |
d35c1bb1 LP |
158 | |
159 | t = udev_monitor_receive_device(monitor); | |
160 | if (!t) | |
161 | continue; | |
162 | ||
8ec1a079 | 163 | if (streq_ptr(udev_device_get_sysname(t), sysname)) { |
d35c1bb1 LP |
164 | *ret = udev_device_ref(t); |
165 | return 0; | |
166 | } | |
3990f247 | 167 | } |
d35c1bb1 LP |
168 | } |
169 | ||
170 | static int determine_state_file( | |
171 | struct udev *udev, | |
172 | const struct rfkill_event *event, | |
d35c1bb1 LP |
173 | char **ret) { |
174 | ||
8e707663 | 175 | _cleanup_udev_device_unref_ struct udev_device *d = NULL; |
d35c1bb1 LP |
176 | _cleanup_udev_device_unref_ struct udev_device *device = NULL; |
177 | const char *path_id, *type; | |
178 | char *state_file; | |
179 | int r; | |
180 | ||
181 | assert(event); | |
d35c1bb1 LP |
182 | assert(ret); |
183 | ||
8e707663 BB |
184 | r = find_device(udev, event, &d); |
185 | if (r < 0) | |
186 | return r; | |
187 | ||
d35c1bb1 LP |
188 | r = wait_for_initialized(udev, d, &device); |
189 | if (r < 0) | |
190 | return r; | |
191 | ||
192 | assert_se(type = rfkill_type_to_string(event->type)); | |
3990f247 | 193 | |
f6f738db LP |
194 | path_id = udev_device_get_property_value(device, "ID_PATH"); |
195 | if (path_id) { | |
d35c1bb1 LP |
196 | _cleanup_free_ char *escaped_path_id = NULL; |
197 | ||
f6f738db | 198 | escaped_path_id = cescape(path_id); |
d35c1bb1 LP |
199 | if (!escaped_path_id) |
200 | return log_oom(); | |
f6f738db | 201 | |
605405c6 | 202 | state_file = strjoin("/var/lib/systemd/rfkill/", escaped_path_id, ":", type); |
f6f738db | 203 | } else |
605405c6 | 204 | state_file = strjoin("/var/lib/systemd/rfkill/", type); |
d35c1bb1 LP |
205 | |
206 | if (!state_file) | |
207 | return log_oom(); | |
208 | ||
209 | *ret = state_file; | |
210 | return 0; | |
211 | } | |
212 | ||
213 | static int load_state( | |
214 | int rfkill_fd, | |
215 | struct udev *udev, | |
216 | const struct rfkill_event *event) { | |
217 | ||
d35c1bb1 LP |
218 | _cleanup_free_ char *state_file = NULL, *value = NULL; |
219 | struct rfkill_event we; | |
220 | ssize_t l; | |
221 | int b, r; | |
f6f738db | 222 | |
d35c1bb1 LP |
223 | assert(rfkill_fd >= 0); |
224 | assert(udev); | |
225 | assert(event); | |
226 | ||
934ae16b | 227 | if (shall_restore_state() == 0) |
d35c1bb1 LP |
228 | return 0; |
229 | ||
8e707663 | 230 | r = determine_state_file(udev, event, &state_file); |
d35c1bb1 LP |
231 | if (r < 0) |
232 | return r; | |
233 | ||
234 | r = read_one_line_file(state_file, &value); | |
235 | if (r == -ENOENT) { | |
236 | /* No state file? Then save the current state */ | |
237 | ||
238 | r = write_string_file(state_file, one_zero(event->soft), WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_ATOMIC); | |
239 | if (r < 0) | |
240 | return log_error_errno(r, "Failed to write state file %s: %m", state_file); | |
241 | ||
242 | log_debug("Saved state '%s' to %s.", one_zero(event->soft), state_file); | |
243 | return 0; | |
244 | } | |
245 | if (r < 0) | |
246 | return log_error_errno(r, "Failed to read state file %s: %m", state_file); | |
247 | ||
248 | b = parse_boolean(value); | |
249 | if (b < 0) | |
250 | return log_error_errno(b, "Failed to parse state file %s: %m", state_file); | |
251 | ||
252 | we = (struct rfkill_event) { | |
253 | .op = RFKILL_OP_CHANGE, | |
254 | .idx = event->idx, | |
255 | .soft = b, | |
256 | }; | |
257 | ||
258 | l = write(rfkill_fd, &we, sizeof(we)); | |
259 | if (l < 0) | |
260 | return log_error_errno(errno, "Failed to restore rfkill state for %i: %m", event->idx); | |
261 | if (l != sizeof(we)) { | |
262 | log_error("Couldn't write rfkill event structure, too short."); | |
263 | return -EIO; | |
264 | } | |
265 | ||
266 | log_debug("Loaded state '%s' from %s.", one_zero(b), state_file); | |
267 | return 0; | |
268 | } | |
269 | ||
202cb8c3 BB |
270 | static void save_state_queue_remove( |
271 | struct write_queue_item **write_queue, | |
272 | int idx, | |
273 | char *state_file) { | |
274 | ||
275 | struct write_queue_item *item, *tmp; | |
276 | ||
277 | LIST_FOREACH_SAFE(queue, item, tmp, *write_queue) { | |
278 | if ((state_file && streq(item->file, state_file)) || idx == item->rfkill_idx) { | |
279 | log_debug("Canceled previous save state of '%s' to %s.", one_zero(item->state), item->file); | |
280 | LIST_REMOVE(queue, *write_queue, item); | |
281 | write_queue_item_free(item); | |
282 | } | |
283 | } | |
284 | } | |
285 | ||
286 | static int save_state_queue( | |
287 | struct write_queue_item **write_queue, | |
d35c1bb1 LP |
288 | int rfkill_fd, |
289 | struct udev *udev, | |
290 | const struct rfkill_event *event) { | |
291 | ||
d35c1bb1 | 292 | _cleanup_free_ char *state_file = NULL; |
202cb8c3 | 293 | struct write_queue_item *item; |
d35c1bb1 LP |
294 | int r; |
295 | ||
296 | assert(rfkill_fd >= 0); | |
297 | assert(udev); | |
298 | assert(event); | |
299 | ||
8e707663 | 300 | r = determine_state_file(udev, event, &state_file); |
d35c1bb1 LP |
301 | if (r < 0) |
302 | return r; | |
bc5e002e | 303 | |
202cb8c3 | 304 | save_state_queue_remove(write_queue, event->idx, state_file); |
d35c1bb1 | 305 | |
202cb8c3 BB |
306 | item = new0(struct write_queue_item, 1); |
307 | if (!item) | |
308 | return -ENOMEM; | |
309 | ||
1cc6c93a | 310 | item->file = TAKE_PTR(state_file); |
202cb8c3 BB |
311 | item->rfkill_idx = event->idx; |
312 | item->state = event->soft; | |
202cb8c3 BB |
313 | |
314 | LIST_APPEND(queue, *write_queue, item); | |
315 | ||
316 | return 0; | |
317 | } | |
318 | ||
319 | static int save_state_cancel( | |
320 | struct write_queue_item **write_queue, | |
321 | int rfkill_fd, | |
322 | struct udev *udev, | |
323 | const struct rfkill_event *event) { | |
324 | ||
325 | _cleanup_free_ char *state_file = NULL; | |
326 | int r; | |
327 | ||
328 | assert(rfkill_fd >= 0); | |
329 | assert(udev); | |
330 | assert(event); | |
331 | ||
332 | r = determine_state_file(udev, event, &state_file); | |
333 | save_state_queue_remove(write_queue, event->idx, state_file); | |
d35c1bb1 | 334 | if (r < 0) |
202cb8c3 | 335 | return r; |
d35c1bb1 | 336 | |
d35c1bb1 LP |
337 | return 0; |
338 | } | |
339 | ||
202cb8c3 BB |
340 | static int save_state_write(struct write_queue_item **write_queue) { |
341 | struct write_queue_item *item, *tmp; | |
342 | int result = 0; | |
343 | bool error_logged = false; | |
344 | int r; | |
345 | ||
346 | LIST_FOREACH_SAFE(queue, item, tmp, *write_queue) { | |
347 | r = write_string_file(item->file, one_zero(item->state), WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_ATOMIC); | |
348 | if (r < 0) { | |
349 | result = r; | |
350 | if (!error_logged) { | |
351 | log_error_errno(r, "Failed to write state file %s: %m", item->file); | |
352 | error_logged = true; | |
353 | } else | |
354 | log_warning_errno(r, "Failed to write state file %s: %m", item->file); | |
355 | } else | |
356 | log_debug("Saved state '%s' to %s.", one_zero(item->state), item->file); | |
357 | ||
358 | LIST_REMOVE(queue, *write_queue, item); | |
359 | write_queue_item_free(item); | |
360 | } | |
361 | return result; | |
362 | } | |
363 | ||
d35c1bb1 | 364 | int main(int argc, char *argv[]) { |
202cb8c3 | 365 | LIST_HEAD(write_queue_item, write_queue); |
d35c1bb1 LP |
366 | _cleanup_udev_unref_ struct udev *udev = NULL; |
367 | _cleanup_close_ int rfkill_fd = -1; | |
368 | bool ready = false; | |
369 | int r, n; | |
370 | ||
371 | if (argc > 1) { | |
372 | log_error("This program requires no arguments."); | |
3990f247 LP |
373 | return EXIT_FAILURE; |
374 | } | |
375 | ||
202cb8c3 BB |
376 | LIST_HEAD_INIT(write_queue); |
377 | ||
d35c1bb1 LP |
378 | log_set_target(LOG_TARGET_AUTO); |
379 | log_parse_environment(); | |
380 | log_open(); | |
3990f247 | 381 | |
d35c1bb1 | 382 | umask(0022); |
354806fb | 383 | |
d35c1bb1 LP |
384 | udev = udev_new(); |
385 | if (!udev) { | |
386 | r = log_oom(); | |
387 | goto finish; | |
388 | } | |
389 | ||
390 | r = mkdir_p("/var/lib/systemd/rfkill", 0755); | |
391 | if (r < 0) { | |
392 | log_error_errno(r, "Failed to create rfkill directory: %m"); | |
393 | goto finish; | |
394 | } | |
395 | ||
396 | n = sd_listen_fds(false); | |
397 | if (n < 0) { | |
398 | r = log_error_errno(n, "Failed to determine whether we got any file descriptors passed: %m"); | |
399 | goto finish; | |
400 | } | |
401 | if (n > 1) { | |
402 | log_error("Got too many file descriptors."); | |
403 | r = -EINVAL; | |
404 | goto finish; | |
405 | } | |
406 | ||
407 | if (n == 0) { | |
408 | rfkill_fd = open("/dev/rfkill", O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK); | |
409 | if (rfkill_fd < 0) { | |
410 | if (errno == ENOENT) { | |
411 | log_debug_errno(errno, "Missing rfkill subsystem, or no device present, exiting."); | |
412 | r = 0; | |
413 | goto finish; | |
414 | } | |
415 | ||
416 | r = log_error_errno(errno, "Failed to open /dev/rfkill: %m"); | |
417 | goto finish; | |
3990f247 | 418 | } |
d35c1bb1 LP |
419 | } else { |
420 | rfkill_fd = SD_LISTEN_FDS_START; | |
3990f247 | 421 | |
d35c1bb1 | 422 | r = fd_nonblock(rfkill_fd, 1); |
3990f247 | 423 | if (r < 0) { |
d35c1bb1 LP |
424 | log_error_errno(r, "Failed to make /dev/rfkill socket non-blocking: %m"); |
425 | goto finish; | |
3990f247 | 426 | } |
d35c1bb1 LP |
427 | } |
428 | ||
429 | for (;;) { | |
430 | struct rfkill_event event; | |
431 | const char *type; | |
432 | ssize_t l; | |
3990f247 | 433 | |
d35c1bb1 LP |
434 | l = read(rfkill_fd, &event, sizeof(event)); |
435 | if (l < 0) { | |
436 | if (errno == EAGAIN) { | |
3990f247 | 437 | |
d35c1bb1 LP |
438 | if (!ready) { |
439 | /* Notify manager that we are | |
440 | * now finished with | |
441 | * processing whatever was | |
442 | * queued */ | |
443 | (void) sd_notify(false, "READY=1"); | |
444 | ready = true; | |
445 | } | |
446 | ||
447 | /* Hang around for a bit, maybe there's more coming */ | |
448 | ||
449 | r = fd_wait_for_event(rfkill_fd, POLLIN, EXIT_USEC); | |
450 | if (r == -EINTR) | |
451 | continue; | |
452 | if (r < 0) { | |
453 | log_error_errno(r, "Failed to poll() on device: %m"); | |
454 | goto finish; | |
455 | } | |
456 | if (r > 0) | |
457 | continue; | |
458 | ||
459 | log_debug("All events read and idle, exiting."); | |
460 | break; | |
461 | } | |
462 | ||
463 | log_error_errno(errno, "Failed to read from /dev/rfkill: %m"); | |
3990f247 LP |
464 | } |
465 | ||
d35c1bb1 LP |
466 | if (l != RFKILL_EVENT_SIZE_V1) { |
467 | log_error("Read event structure of invalid size."); | |
468 | r = -EIO; | |
469 | goto finish; | |
3990f247 LP |
470 | } |
471 | ||
d35c1bb1 LP |
472 | type = rfkill_type_to_string(event.type); |
473 | if (!type) { | |
474 | log_debug("An rfkill device of unknown type %i discovered, ignoring.", event.type); | |
475 | continue; | |
476 | } | |
477 | ||
478 | switch (event.op) { | |
479 | ||
480 | case RFKILL_OP_ADD: | |
481 | log_debug("A new rfkill device has been added with index %i and type %s.", event.idx, type); | |
482 | (void) load_state(rfkill_fd, udev, &event); | |
483 | break; | |
484 | ||
485 | case RFKILL_OP_DEL: | |
486 | log_debug("An rfkill device has been removed with index %i and type %s", event.idx, type); | |
202cb8c3 | 487 | (void) save_state_cancel(&write_queue, rfkill_fd, udev, &event); |
d35c1bb1 LP |
488 | break; |
489 | ||
490 | case RFKILL_OP_CHANGE: | |
491 | log_debug("An rfkill device has changed state with index %i and type %s", event.idx, type); | |
202cb8c3 | 492 | (void) save_state_queue(&write_queue, rfkill_fd, udev, &event); |
d35c1bb1 LP |
493 | break; |
494 | ||
495 | default: | |
496 | log_debug("Unknown event %i from /dev/rfkill for index %i and type %s, ignoring.", event.op, event.idx, type); | |
497 | break; | |
498 | } | |
3990f247 LP |
499 | } |
500 | ||
d35c1bb1 LP |
501 | r = 0; |
502 | ||
503 | finish: | |
202cb8c3 BB |
504 | (void) save_state_write(&write_queue); |
505 | ||
d35c1bb1 | 506 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
3990f247 | 507 | } |