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3990f247 LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2013 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 | ||
d35c1bb1 LP |
22 | #include <linux/rfkill.h> |
23 | #include <poll.h> | |
24 | ||
3990f247 | 25 | #include "libudev.h" |
d35c1bb1 LP |
26 | #include "sd-daemon.h" |
27 | ||
4f5dd394 | 28 | #include "escape.h" |
3ffd4af2 | 29 | #include "fd-util.h" |
d35c1bb1 | 30 | #include "fileio.h" |
c004493c | 31 | #include "io-util.h" |
d35c1bb1 | 32 | #include "mkdir.h" |
6bedfcbb | 33 | #include "parse-util.h" |
07630cea | 34 | #include "string-util.h" |
3990f247 | 35 | #include "udev-util.h" |
d35c1bb1 | 36 | #include "util.h" |
3990f247 | 37 | |
d35c1bb1 | 38 | #define EXIT_USEC (5 * USEC_PER_SEC) |
3990f247 | 39 | |
d35c1bb1 LP |
40 | static const char* const rfkill_type_table[NUM_RFKILL_TYPES] = { |
41 | [RFKILL_TYPE_ALL] = "all", | |
42 | [RFKILL_TYPE_WLAN] = "wlan", | |
43 | [RFKILL_TYPE_BLUETOOTH] = "bluetooth", | |
44 | [RFKILL_TYPE_UWB] = "uwb", | |
45 | [RFKILL_TYPE_WIMAX] = "wimax", | |
46 | [RFKILL_TYPE_WWAN] = "wwan", | |
47 | [RFKILL_TYPE_GPS] = "gps", | |
ac9455ef TA |
48 | [RFKILL_TYPE_FM] = "fm", |
49 | [RFKILL_TYPE_NFC] = "nfc", | |
d35c1bb1 | 50 | }; |
3990f247 | 51 | |
d35c1bb1 | 52 | DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(rfkill_type, int); |
3990f247 | 53 | |
d35c1bb1 LP |
54 | static int find_device( |
55 | struct udev *udev, | |
56 | const struct rfkill_event *event, | |
57 | struct udev_device **ret) { | |
3990f247 | 58 | |
d35c1bb1 LP |
59 | _cleanup_free_ char *sysname = NULL; |
60 | struct udev_device *device; | |
61 | const char *name; | |
3990f247 | 62 | |
d35c1bb1 LP |
63 | assert(udev); |
64 | assert(event); | |
65 | assert(ret); | |
3990f247 | 66 | |
d35c1bb1 LP |
67 | if (asprintf(&sysname, "rfkill%i", event->idx) < 0) |
68 | return log_oom(); | |
69 | ||
70 | device = udev_device_new_from_subsystem_sysname(udev, "rfkill", sysname); | |
71 | if (!device) | |
72 | return log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_ERR, errno, "Failed to open device: %m"); | |
3990f247 LP |
73 | |
74 | name = udev_device_get_sysattr_value(device, "name"); | |
75 | if (!name) { | |
d35c1bb1 LP |
76 | log_debug("Device has no name, ignoring."); |
77 | udev_device_unref(device); | |
78 | return -ENOENT; | |
4844262f LP |
79 | } |
80 | ||
81 | log_debug("Operating on rfkill device '%s'.", name); | |
82 | ||
d35c1bb1 LP |
83 | *ret = device; |
84 | return 0; | |
85 | } | |
86 | ||
87 | static int wait_for_initialized( | |
88 | struct udev *udev, | |
89 | struct udev_device *device, | |
90 | struct udev_device **ret) { | |
91 | ||
92 | _cleanup_udev_monitor_unref_ struct udev_monitor *monitor = NULL; | |
93 | struct udev_device *d; | |
94 | const char *sysname; | |
95 | int watch_fd, r; | |
96 | ||
97 | assert(udev); | |
98 | assert(device); | |
99 | assert(ret); | |
100 | ||
101 | if (udev_device_get_is_initialized(device) != 0) { | |
102 | *ret = udev_device_ref(device); | |
103 | return 0; | |
3990f247 LP |
104 | } |
105 | ||
d35c1bb1 LP |
106 | assert_se(sysname = udev_device_get_sysname(device)); |
107 | ||
108 | /* Wait until the device is initialized, so that we can get | |
109 | * access to the ID_PATH property */ | |
110 | ||
111 | monitor = udev_monitor_new_from_netlink(udev, "udev"); | |
112 | if (!monitor) | |
113 | return log_error_errno(errno, "Failed to acquire monitor: %m"); | |
114 | ||
115 | r = udev_monitor_filter_add_match_subsystem_devtype(monitor, "rfkill", NULL); | |
116 | if (r < 0) | |
117 | return log_error_errno(r, "Failed to add rfkill udev match to monitor: %m"); | |
118 | ||
119 | r = udev_monitor_enable_receiving(monitor); | |
120 | if (r < 0) | |
121 | return log_error_errno(r, "Failed to enable udev receiving: %m"); | |
122 | ||
123 | watch_fd = udev_monitor_get_fd(monitor); | |
124 | if (watch_fd < 0) | |
125 | return log_error_errno(watch_fd, "Failed to get watch fd: %m"); | |
126 | ||
127 | /* Check again, maybe things changed */ | |
128 | d = udev_device_new_from_subsystem_sysname(udev, "rfkill", sysname); | |
129 | if (!d) | |
130 | return log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_ERR, errno, "Failed to open device: %m"); | |
131 | ||
132 | if (udev_device_get_is_initialized(d) != 0) { | |
133 | *ret = d; | |
134 | return 0; | |
135 | } | |
136 | ||
137 | for (;;) { | |
138 | _cleanup_udev_device_unref_ struct udev_device *t = NULL; | |
139 | ||
140 | r = fd_wait_for_event(watch_fd, POLLIN, USEC_INFINITY); | |
141 | if (r == -EINTR) | |
142 | continue; | |
143 | if (r < 0) | |
144 | return log_error_errno(r, "Failed to watch udev monitor: %m"); | |
145 | ||
146 | t = udev_monitor_receive_device(monitor); | |
147 | if (!t) | |
148 | continue; | |
149 | ||
150 | if (streq_ptr(udev_device_get_sysname(device), sysname)) { | |
151 | *ret = udev_device_ref(t); | |
152 | return 0; | |
153 | } | |
3990f247 | 154 | } |
d35c1bb1 LP |
155 | } |
156 | ||
157 | static int determine_state_file( | |
158 | struct udev *udev, | |
159 | const struct rfkill_event *event, | |
160 | struct udev_device *d, | |
161 | char **ret) { | |
162 | ||
163 | _cleanup_udev_device_unref_ struct udev_device *device = NULL; | |
164 | const char *path_id, *type; | |
165 | char *state_file; | |
166 | int r; | |
167 | ||
168 | assert(event); | |
169 | assert(d); | |
170 | assert(ret); | |
171 | ||
172 | r = wait_for_initialized(udev, d, &device); | |
173 | if (r < 0) | |
174 | return r; | |
175 | ||
176 | assert_se(type = rfkill_type_to_string(event->type)); | |
3990f247 | 177 | |
f6f738db LP |
178 | path_id = udev_device_get_property_value(device, "ID_PATH"); |
179 | if (path_id) { | |
d35c1bb1 LP |
180 | _cleanup_free_ char *escaped_path_id = NULL; |
181 | ||
f6f738db | 182 | escaped_path_id = cescape(path_id); |
d35c1bb1 LP |
183 | if (!escaped_path_id) |
184 | return log_oom(); | |
f6f738db | 185 | |
d35c1bb1 | 186 | state_file = strjoin("/var/lib/systemd/rfkill/", escaped_path_id, ":", type, NULL); |
f6f738db | 187 | } else |
d35c1bb1 LP |
188 | state_file = strjoin("/var/lib/systemd/rfkill/", type, NULL); |
189 | ||
190 | if (!state_file) | |
191 | return log_oom(); | |
192 | ||
193 | *ret = state_file; | |
194 | return 0; | |
195 | } | |
196 | ||
197 | static int load_state( | |
198 | int rfkill_fd, | |
199 | struct udev *udev, | |
200 | const struct rfkill_event *event) { | |
201 | ||
202 | _cleanup_udev_device_unref_ struct udev_device *device = NULL; | |
203 | _cleanup_free_ char *state_file = NULL, *value = NULL; | |
204 | struct rfkill_event we; | |
205 | ssize_t l; | |
206 | int b, r; | |
f6f738db | 207 | |
d35c1bb1 LP |
208 | assert(rfkill_fd >= 0); |
209 | assert(udev); | |
210 | assert(event); | |
211 | ||
212 | if (!shall_restore_state()) | |
213 | return 0; | |
214 | ||
215 | r = find_device(udev, event, &device); | |
216 | if (r < 0) | |
217 | return r; | |
218 | ||
219 | r = determine_state_file(udev, event, device, &state_file); | |
220 | if (r < 0) | |
221 | return r; | |
222 | ||
223 | r = read_one_line_file(state_file, &value); | |
224 | if (r == -ENOENT) { | |
225 | /* No state file? Then save the current state */ | |
226 | ||
227 | r = write_string_file(state_file, one_zero(event->soft), WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_ATOMIC); | |
228 | if (r < 0) | |
229 | return log_error_errno(r, "Failed to write state file %s: %m", state_file); | |
230 | ||
231 | log_debug("Saved state '%s' to %s.", one_zero(event->soft), state_file); | |
232 | return 0; | |
233 | } | |
234 | if (r < 0) | |
235 | return log_error_errno(r, "Failed to read state file %s: %m", state_file); | |
236 | ||
237 | b = parse_boolean(value); | |
238 | if (b < 0) | |
239 | return log_error_errno(b, "Failed to parse state file %s: %m", state_file); | |
240 | ||
241 | we = (struct rfkill_event) { | |
242 | .op = RFKILL_OP_CHANGE, | |
243 | .idx = event->idx, | |
244 | .soft = b, | |
245 | }; | |
246 | ||
247 | l = write(rfkill_fd, &we, sizeof(we)); | |
248 | if (l < 0) | |
249 | return log_error_errno(errno, "Failed to restore rfkill state for %i: %m", event->idx); | |
250 | if (l != sizeof(we)) { | |
251 | log_error("Couldn't write rfkill event structure, too short."); | |
252 | return -EIO; | |
253 | } | |
254 | ||
255 | log_debug("Loaded state '%s' from %s.", one_zero(b), state_file); | |
256 | return 0; | |
257 | } | |
258 | ||
259 | static int save_state( | |
260 | int rfkill_fd, | |
261 | struct udev *udev, | |
262 | const struct rfkill_event *event) { | |
263 | ||
264 | _cleanup_udev_device_unref_ struct udev_device *device = NULL; | |
265 | _cleanup_free_ char *state_file = NULL; | |
266 | int r; | |
267 | ||
268 | assert(rfkill_fd >= 0); | |
269 | assert(udev); | |
270 | assert(event); | |
271 | ||
272 | r = find_device(udev, event, &device); | |
273 | if (r < 0) | |
274 | return r; | |
275 | ||
276 | r = determine_state_file(udev, event, device, &state_file); | |
277 | if (r < 0) | |
278 | return r; | |
279 | ||
280 | r = write_string_file(state_file, one_zero(event->soft), WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_ATOMIC); | |
281 | if (r < 0) | |
282 | return log_error_errno(r, "Failed to write state file %s: %m", state_file); | |
283 | ||
284 | log_debug("Saved state '%s' to %s.", one_zero(event->soft), state_file); | |
285 | return 0; | |
286 | } | |
287 | ||
288 | int main(int argc, char *argv[]) { | |
289 | _cleanup_udev_unref_ struct udev *udev = NULL; | |
290 | _cleanup_close_ int rfkill_fd = -1; | |
291 | bool ready = false; | |
292 | int r, n; | |
293 | ||
294 | if (argc > 1) { | |
295 | log_error("This program requires no arguments."); | |
3990f247 LP |
296 | return EXIT_FAILURE; |
297 | } | |
298 | ||
d35c1bb1 LP |
299 | log_set_target(LOG_TARGET_AUTO); |
300 | log_parse_environment(); | |
301 | log_open(); | |
3990f247 | 302 | |
d35c1bb1 | 303 | umask(0022); |
354806fb | 304 | |
d35c1bb1 LP |
305 | udev = udev_new(); |
306 | if (!udev) { | |
307 | r = log_oom(); | |
308 | goto finish; | |
309 | } | |
310 | ||
311 | r = mkdir_p("/var/lib/systemd/rfkill", 0755); | |
312 | if (r < 0) { | |
313 | log_error_errno(r, "Failed to create rfkill directory: %m"); | |
314 | goto finish; | |
315 | } | |
316 | ||
317 | n = sd_listen_fds(false); | |
318 | if (n < 0) { | |
319 | r = log_error_errno(n, "Failed to determine whether we got any file descriptors passed: %m"); | |
320 | goto finish; | |
321 | } | |
322 | if (n > 1) { | |
323 | log_error("Got too many file descriptors."); | |
324 | r = -EINVAL; | |
325 | goto finish; | |
326 | } | |
327 | ||
328 | if (n == 0) { | |
329 | rfkill_fd = open("/dev/rfkill", O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK); | |
330 | if (rfkill_fd < 0) { | |
331 | if (errno == ENOENT) { | |
332 | log_debug_errno(errno, "Missing rfkill subsystem, or no device present, exiting."); | |
333 | r = 0; | |
334 | goto finish; | |
335 | } | |
336 | ||
337 | r = log_error_errno(errno, "Failed to open /dev/rfkill: %m"); | |
338 | goto finish; | |
3990f247 | 339 | } |
d35c1bb1 LP |
340 | } else { |
341 | rfkill_fd = SD_LISTEN_FDS_START; | |
3990f247 | 342 | |
d35c1bb1 | 343 | r = fd_nonblock(rfkill_fd, 1); |
3990f247 | 344 | if (r < 0) { |
d35c1bb1 LP |
345 | log_error_errno(r, "Failed to make /dev/rfkill socket non-blocking: %m"); |
346 | goto finish; | |
3990f247 | 347 | } |
d35c1bb1 LP |
348 | } |
349 | ||
350 | for (;;) { | |
351 | struct rfkill_event event; | |
352 | const char *type; | |
353 | ssize_t l; | |
3990f247 | 354 | |
d35c1bb1 LP |
355 | l = read(rfkill_fd, &event, sizeof(event)); |
356 | if (l < 0) { | |
357 | if (errno == EAGAIN) { | |
3990f247 | 358 | |
d35c1bb1 LP |
359 | if (!ready) { |
360 | /* Notify manager that we are | |
361 | * now finished with | |
362 | * processing whatever was | |
363 | * queued */ | |
364 | (void) sd_notify(false, "READY=1"); | |
365 | ready = true; | |
366 | } | |
367 | ||
368 | /* Hang around for a bit, maybe there's more coming */ | |
369 | ||
370 | r = fd_wait_for_event(rfkill_fd, POLLIN, EXIT_USEC); | |
371 | if (r == -EINTR) | |
372 | continue; | |
373 | if (r < 0) { | |
374 | log_error_errno(r, "Failed to poll() on device: %m"); | |
375 | goto finish; | |
376 | } | |
377 | if (r > 0) | |
378 | continue; | |
379 | ||
380 | log_debug("All events read and idle, exiting."); | |
381 | break; | |
382 | } | |
383 | ||
384 | log_error_errno(errno, "Failed to read from /dev/rfkill: %m"); | |
3990f247 LP |
385 | } |
386 | ||
d35c1bb1 LP |
387 | if (l != RFKILL_EVENT_SIZE_V1) { |
388 | log_error("Read event structure of invalid size."); | |
389 | r = -EIO; | |
390 | goto finish; | |
3990f247 LP |
391 | } |
392 | ||
d35c1bb1 LP |
393 | type = rfkill_type_to_string(event.type); |
394 | if (!type) { | |
395 | log_debug("An rfkill device of unknown type %i discovered, ignoring.", event.type); | |
396 | continue; | |
397 | } | |
398 | ||
399 | switch (event.op) { | |
400 | ||
401 | case RFKILL_OP_ADD: | |
402 | log_debug("A new rfkill device has been added with index %i and type %s.", event.idx, type); | |
403 | (void) load_state(rfkill_fd, udev, &event); | |
404 | break; | |
405 | ||
406 | case RFKILL_OP_DEL: | |
407 | log_debug("An rfkill device has been removed with index %i and type %s", event.idx, type); | |
408 | break; | |
409 | ||
410 | case RFKILL_OP_CHANGE: | |
411 | log_debug("An rfkill device has changed state with index %i and type %s", event.idx, type); | |
412 | (void) save_state(rfkill_fd, udev, &event); | |
413 | break; | |
414 | ||
415 | default: | |
416 | log_debug("Unknown event %i from /dev/rfkill for index %i and type %s, ignoring.", event.op, event.idx, type); | |
417 | break; | |
418 | } | |
3990f247 LP |
419 | } |
420 | ||
d35c1bb1 LP |
421 | r = 0; |
422 | ||
423 | finish: | |
424 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; | |
3990f247 | 425 | } |