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88a6477e KS |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2008-2012 Kay Sievers <kay@vrfy.org> | |
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 | ***/ | |
eb1f0e66 | 19 | |
eb1f0e66 KS |
20 | #include <stdio.h> |
21 | #include <stdlib.h> | |
22 | #include <stddef.h> | |
23 | #include <unistd.h> | |
fc8d61c5 | 24 | #include <stdbool.h> |
eb1f0e66 KS |
25 | #include <errno.h> |
26 | #include <string.h> | |
27 | #include <dirent.h> | |
93b0f384 | 28 | #include <fcntl.h> |
517814e7 | 29 | #include <ctype.h> |
3e0a2c9a | 30 | #include <net/if.h> |
eb1f0e66 | 31 | #include <sys/stat.h> |
3e0a2c9a KS |
32 | #include <sys/ioctl.h> |
33 | #include <sys/socket.h> | |
34 | #include <linux/sockios.h> | |
eb1f0e66 KS |
35 | |
36 | #include "libudev.h" | |
37 | #include "libudev-private.h" | |
eb1f0e66 | 38 | |
b2661839 KS |
39 | static int udev_device_set_devnode(struct udev_device *udev_device, const char *devnode); |
40 | ||
ce1d6d7f KS |
41 | /** |
42 | * SECTION:libudev-device | |
43 | * @short_description: kernel sys devices | |
44 | * | |
45 | * Representation of kernel sys devices. Devices are uniquely identified | |
46 | * by their syspath, every device has exactly one path in the kernel sys | |
5eec7de6 | 47 | * filesystem. Devices usually belong to a kernel subsystem, and have |
214a6c79 | 48 | * a unique name inside that subsystem. |
ce1d6d7f KS |
49 | */ |
50 | ||
1e511322 KS |
51 | /** |
52 | * udev_device: | |
53 | * | |
ce1d6d7f | 54 | * Opaque object representing one kernel sys device. |
1e511322 | 55 | */ |
11d543c1 | 56 | struct udev_device { |
912541b0 KS |
57 | struct udev *udev; |
58 | struct udev_device *parent_device; | |
59 | char *syspath; | |
60 | const char *devpath; | |
61 | char *sysname; | |
62 | const char *sysnum; | |
63 | char *devnode; | |
64 | mode_t devnode_mode; | |
1edefa4f KS |
65 | uid_t devnode_uid; |
66 | gid_t devnode_gid; | |
912541b0 KS |
67 | char *subsystem; |
68 | char *devtype; | |
69 | char *driver; | |
70 | char *action; | |
71 | char *devpath_old; | |
72 | char *id_filename; | |
73 | char **envp; | |
74 | char *monitor_buf; | |
75 | size_t monitor_buf_len; | |
76 | struct udev_list devlinks_list; | |
77 | struct udev_list properties_list; | |
78 | struct udev_list sysattr_value_list; | |
79 | struct udev_list sysattr_list; | |
80 | struct udev_list tags_list; | |
81 | unsigned long long int seqnum; | |
40fe8b11 | 82 | usec_t usec_initialized; |
912541b0 KS |
83 | int devlink_priority; |
84 | int refcount; | |
85 | dev_t devnum; | |
86 | int ifindex; | |
87 | int watch_handle; | |
88 | int maj, min; | |
89 | bool parent_set; | |
90 | bool subsystem_set; | |
91 | bool devtype_set; | |
92 | bool devlinks_uptodate; | |
93 | bool envp_uptodate; | |
94 | bool tags_uptodate; | |
95 | bool driver_set; | |
96 | bool info_loaded; | |
97 | bool db_loaded; | |
98 | bool uevent_loaded; | |
99 | bool is_initialized; | |
100 | bool sysattr_list_read; | |
101 | bool db_persist; | |
11d543c1 KS |
102 | }; |
103 | ||
905555dc | 104 | /** |
a3321f68 | 105 | * udev_device_get_seqnum: |
905555dc KS |
106 | * @udev_device: udev device |
107 | * | |
108 | * This is only valid if the device was received through a monitor. Devices read from | |
109 | * sys do not have a sequence number. | |
110 | * | |
111 | * Returns: the kernel event sequence number, or 0 if there is no sequence number available. | |
112 | **/ | |
54cf0b7f | 113 | _public_ unsigned long long int udev_device_get_seqnum(struct udev_device *udev_device) |
905555dc | 114 | { |
912541b0 KS |
115 | if (udev_device == NULL) |
116 | return 0; | |
117 | return udev_device->seqnum; | |
905555dc KS |
118 | } |
119 | ||
120 | static int udev_device_set_seqnum(struct udev_device *udev_device, unsigned long long int seqnum) | |
121 | { | |
912541b0 | 122 | char num[32]; |
905555dc | 123 | |
912541b0 KS |
124 | udev_device->seqnum = seqnum; |
125 | snprintf(num, sizeof(num), "%llu", seqnum); | |
126 | udev_device_add_property(udev_device, "SEQNUM", num); | |
127 | return 0; | |
905555dc KS |
128 | } |
129 | ||
130 | int udev_device_get_ifindex(struct udev_device *udev_device) | |
131 | { | |
912541b0 KS |
132 | if (!udev_device->info_loaded) |
133 | udev_device_read_uevent_file(udev_device); | |
134 | return udev_device->ifindex; | |
905555dc KS |
135 | } |
136 | ||
137 | static int udev_device_set_ifindex(struct udev_device *udev_device, int ifindex) | |
138 | { | |
912541b0 | 139 | char num[32]; |
905555dc | 140 | |
912541b0 | 141 | udev_device->ifindex = ifindex; |
c4ef0548 | 142 | snprintf(num, sizeof(num), "%d", ifindex); |
912541b0 KS |
143 | udev_device_add_property(udev_device, "IFINDEX", num); |
144 | return 0; | |
905555dc KS |
145 | } |
146 | ||
147 | /** | |
148 | * udev_device_get_devnum: | |
149 | * @udev_device: udev device | |
150 | * | |
21dbe43a KS |
151 | * Get the device major/minor number. |
152 | * | |
153 | * Returns: the dev_t number. | |
905555dc | 154 | **/ |
54cf0b7f | 155 | _public_ dev_t udev_device_get_devnum(struct udev_device *udev_device) |
905555dc | 156 | { |
912541b0 KS |
157 | if (udev_device == NULL) |
158 | return makedev(0, 0); | |
159 | if (!udev_device->info_loaded) | |
160 | udev_device_read_uevent_file(udev_device); | |
161 | return udev_device->devnum; | |
905555dc KS |
162 | } |
163 | ||
572016d1 | 164 | int udev_device_set_devnum(struct udev_device *udev_device, dev_t devnum) |
905555dc | 165 | { |
912541b0 | 166 | char num[32]; |
905555dc | 167 | |
912541b0 | 168 | udev_device->devnum = devnum; |
905555dc | 169 | |
912541b0 KS |
170 | snprintf(num, sizeof(num), "%u", major(devnum)); |
171 | udev_device_add_property(udev_device, "MAJOR", num); | |
172 | snprintf(num, sizeof(num), "%u", minor(devnum)); | |
173 | udev_device_add_property(udev_device, "MINOR", num); | |
174 | return 0; | |
905555dc KS |
175 | } |
176 | ||
905555dc KS |
177 | const char *udev_device_get_devpath_old(struct udev_device *udev_device) |
178 | { | |
912541b0 | 179 | return udev_device->devpath_old; |
905555dc KS |
180 | } |
181 | ||
182 | static int udev_device_set_devpath_old(struct udev_device *udev_device, const char *devpath_old) | |
183 | { | |
912541b0 | 184 | const char *pos; |
905555dc | 185 | |
912541b0 KS |
186 | free(udev_device->devpath_old); |
187 | udev_device->devpath_old = strdup(devpath_old); | |
188 | if (udev_device->devpath_old == NULL) | |
189 | return -ENOMEM; | |
190 | udev_device_add_property(udev_device, "DEVPATH_OLD", udev_device->devpath_old); | |
905555dc | 191 | |
912541b0 KS |
192 | pos = strrchr(udev_device->devpath_old, '/'); |
193 | if (pos == NULL) | |
194 | return -EINVAL; | |
195 | return 0; | |
905555dc KS |
196 | } |
197 | ||
198 | /** | |
199 | * udev_device_get_driver: | |
200 | * @udev_device: udev device | |
201 | * | |
21dbe43a KS |
202 | * Get the kernel driver name. |
203 | * | |
204 | * Returns: the driver name string, or #NULL if there is no driver attached. | |
905555dc | 205 | **/ |
54cf0b7f | 206 | _public_ const char *udev_device_get_driver(struct udev_device *udev_device) |
905555dc | 207 | { |
912541b0 | 208 | char driver[UTIL_NAME_SIZE]; |
905555dc | 209 | |
912541b0 KS |
210 | if (udev_device == NULL) |
211 | return NULL; | |
212 | if (!udev_device->driver_set) { | |
213 | udev_device->driver_set = true; | |
214 | if (util_get_sys_core_link_value(udev_device->udev, "driver", udev_device->syspath, driver, sizeof(driver)) > 0) | |
215 | udev_device->driver = strdup(driver); | |
216 | } | |
217 | return udev_device->driver; | |
905555dc KS |
218 | } |
219 | ||
220 | static int udev_device_set_driver(struct udev_device *udev_device, const char *driver) | |
221 | { | |
912541b0 KS |
222 | free(udev_device->driver); |
223 | udev_device->driver = strdup(driver); | |
224 | if (udev_device->driver == NULL) | |
225 | return -ENOMEM; | |
226 | udev_device->driver_set = true; | |
227 | udev_device_add_property(udev_device, "DRIVER", udev_device->driver); | |
228 | return 0; | |
905555dc KS |
229 | } |
230 | ||
231 | /** | |
232 | * udev_device_get_devtype: | |
233 | * @udev_device: udev device | |
234 | * | |
235 | * Retrieve the devtype string of the udev device. | |
236 | * | |
237 | * Returns: the devtype name of the udev device, or #NULL if it can not be determined | |
238 | **/ | |
54cf0b7f | 239 | _public_ const char *udev_device_get_devtype(struct udev_device *udev_device) |
905555dc | 240 | { |
912541b0 KS |
241 | if (udev_device == NULL) |
242 | return NULL; | |
243 | if (!udev_device->devtype_set) { | |
244 | udev_device->devtype_set = true; | |
245 | udev_device_read_uevent_file(udev_device); | |
246 | } | |
247 | return udev_device->devtype; | |
905555dc KS |
248 | } |
249 | ||
250 | static int udev_device_set_devtype(struct udev_device *udev_device, const char *devtype) | |
251 | { | |
912541b0 KS |
252 | free(udev_device->devtype); |
253 | udev_device->devtype = strdup(devtype); | |
254 | if (udev_device->devtype == NULL) | |
255 | return -ENOMEM; | |
256 | udev_device->devtype_set = true; | |
257 | udev_device_add_property(udev_device, "DEVTYPE", udev_device->devtype); | |
258 | return 0; | |
905555dc KS |
259 | } |
260 | ||
40fe8b11 | 261 | int udev_device_set_subsystem(struct udev_device *udev_device, const char *subsystem) |
905555dc | 262 | { |
912541b0 KS |
263 | free(udev_device->subsystem); |
264 | udev_device->subsystem = strdup(subsystem); | |
265 | if (udev_device->subsystem == NULL) | |
266 | return -ENOMEM; | |
267 | udev_device->subsystem_set = true; | |
268 | udev_device_add_property(udev_device, "SUBSYSTEM", udev_device->subsystem); | |
269 | return 0; | |
905555dc KS |
270 | } |
271 | ||
272 | /** | |
273 | * udev_device_get_subsystem: | |
274 | * @udev_device: udev device | |
275 | * | |
276 | * Retrieve the subsystem string of the udev device. The string does not | |
277 | * contain any "/". | |
278 | * | |
279 | * Returns: the subsystem name of the udev device, or #NULL if it can not be determined | |
280 | **/ | |
54cf0b7f | 281 | _public_ const char *udev_device_get_subsystem(struct udev_device *udev_device) |
905555dc | 282 | { |
912541b0 KS |
283 | char subsystem[UTIL_NAME_SIZE]; |
284 | ||
285 | if (udev_device == NULL) | |
286 | return NULL; | |
287 | if (!udev_device->subsystem_set) { | |
288 | udev_device->subsystem_set = true; | |
289 | /* read "subsystem" link */ | |
290 | if (util_get_sys_core_link_value(udev_device->udev, "subsystem", udev_device->syspath, subsystem, sizeof(subsystem)) > 0) { | |
291 | udev_device_set_subsystem(udev_device, subsystem); | |
292 | return udev_device->subsystem; | |
293 | } | |
294 | /* implicit names */ | |
33502ffe | 295 | if (startswith(udev_device->devpath, "/module/")) { |
912541b0 KS |
296 | udev_device_set_subsystem(udev_device, "module"); |
297 | return udev_device->subsystem; | |
298 | } | |
299 | if (strstr(udev_device->devpath, "/drivers/") != NULL) { | |
300 | udev_device_set_subsystem(udev_device, "drivers"); | |
301 | return udev_device->subsystem; | |
302 | } | |
33502ffe KS |
303 | if (startswith(udev_device->devpath, "/subsystem/") || |
304 | startswith(udev_device->devpath, "/class/") || | |
305 | startswith(udev_device->devpath, "/bus/")) { | |
912541b0 KS |
306 | udev_device_set_subsystem(udev_device, "subsystem"); |
307 | return udev_device->subsystem; | |
308 | } | |
309 | } | |
310 | return udev_device->subsystem; | |
905555dc KS |
311 | } |
312 | ||
313 | mode_t udev_device_get_devnode_mode(struct udev_device *udev_device) | |
314 | { | |
912541b0 KS |
315 | if (!udev_device->info_loaded) |
316 | udev_device_read_uevent_file(udev_device); | |
317 | return udev_device->devnode_mode; | |
905555dc KS |
318 | } |
319 | ||
320 | static int udev_device_set_devnode_mode(struct udev_device *udev_device, mode_t mode) | |
321 | { | |
912541b0 | 322 | char num[32]; |
905555dc | 323 | |
912541b0 KS |
324 | udev_device->devnode_mode = mode; |
325 | snprintf(num, sizeof(num), "%#o", mode); | |
326 | udev_device_add_property(udev_device, "DEVMODE", num); | |
327 | return 0; | |
905555dc KS |
328 | } |
329 | ||
1edefa4f KS |
330 | uid_t udev_device_get_devnode_uid(struct udev_device *udev_device) |
331 | { | |
332 | if (!udev_device->info_loaded) | |
333 | udev_device_read_uevent_file(udev_device); | |
334 | return udev_device->devnode_uid; | |
335 | } | |
336 | ||
337 | static int udev_device_set_devnode_uid(struct udev_device *udev_device, uid_t uid) | |
338 | { | |
339 | char num[32]; | |
340 | ||
341 | udev_device->devnode_uid = uid; | |
342 | snprintf(num, sizeof(num), "%u", uid); | |
343 | udev_device_add_property(udev_device, "DEVUID", num); | |
344 | return 0; | |
345 | } | |
346 | ||
347 | gid_t udev_device_get_devnode_gid(struct udev_device *udev_device) | |
348 | { | |
349 | if (!udev_device->info_loaded) | |
350 | udev_device_read_uevent_file(udev_device); | |
351 | return udev_device->devnode_gid; | |
352 | } | |
353 | ||
354 | static int udev_device_set_devnode_gid(struct udev_device *udev_device, gid_t gid) | |
355 | { | |
356 | char num[32]; | |
357 | ||
358 | udev_device->devnode_gid = gid; | |
359 | snprintf(num, sizeof(num), "%u", gid); | |
360 | udev_device_add_property(udev_device, "DEVGID", num); | |
361 | return 0; | |
362 | } | |
363 | ||
fc8d61c5 KS |
364 | struct udev_list_entry *udev_device_add_property(struct udev_device *udev_device, const char *key, const char *value) |
365 | { | |
912541b0 KS |
366 | udev_device->envp_uptodate = false; |
367 | if (value == NULL) { | |
368 | struct udev_list_entry *list_entry; | |
fc8d61c5 | 369 | |
912541b0 KS |
370 | list_entry = udev_device_get_properties_list_entry(udev_device); |
371 | list_entry = udev_list_entry_get_by_name(list_entry, key); | |
372 | if (list_entry != NULL) | |
373 | udev_list_entry_delete(list_entry); | |
374 | return NULL; | |
375 | } | |
376 | return udev_list_entry_add(&udev_device->properties_list, key, value); | |
fc8d61c5 KS |
377 | } |
378 | ||
379 | static struct udev_list_entry *udev_device_add_property_from_string(struct udev_device *udev_device, const char *property) | |
380 | { | |
912541b0 KS |
381 | char name[UTIL_LINE_SIZE]; |
382 | char *val; | |
fc8d61c5 | 383 | |
d5a89d7d | 384 | strscpy(name, sizeof(name), property); |
912541b0 KS |
385 | val = strchr(name, '='); |
386 | if (val == NULL) | |
387 | return NULL; | |
388 | val[0] = '\0'; | |
389 | val = &val[1]; | |
390 | if (val[0] == '\0') | |
391 | val = NULL; | |
392 | return udev_device_add_property(udev_device, name, val); | |
fc8d61c5 KS |
393 | } |
394 | ||
395 | /* | |
396 | * parse property string, and if needed, update internal values accordingly | |
397 | * | |
398 | * udev_device_add_property_from_string_parse_finish() needs to be | |
399 | * called after adding properties, and its return value checked | |
400 | * | |
401 | * udev_device_set_info_loaded() needs to be set, to avoid trying | |
402 | * to use a device without a DEVPATH set | |
403 | */ | |
404 | void udev_device_add_property_from_string_parse(struct udev_device *udev_device, const char *property) | |
405 | { | |
33502ffe | 406 | if (startswith(property, "DEVPATH=")) { |
912541b0 KS |
407 | char path[UTIL_PATH_SIZE]; |
408 | ||
d5a89d7d | 409 | strscpyl(path, sizeof(path), "/sys", &property[8], NULL); |
912541b0 | 410 | udev_device_set_syspath(udev_device, path); |
33502ffe | 411 | } else if (startswith(property, "SUBSYSTEM=")) { |
912541b0 | 412 | udev_device_set_subsystem(udev_device, &property[10]); |
33502ffe | 413 | } else if (startswith(property, "DEVTYPE=")) { |
912541b0 | 414 | udev_device_set_devtype(udev_device, &property[8]); |
33502ffe | 415 | } else if (startswith(property, "DEVNAME=")) { |
912541b0 | 416 | udev_device_set_devnode(udev_device, &property[8]); |
33502ffe | 417 | } else if (startswith(property, "DEVLINKS=")) { |
912541b0 KS |
418 | char devlinks[UTIL_PATH_SIZE]; |
419 | char *slink; | |
420 | char *next; | |
421 | ||
d5a89d7d | 422 | strscpy(devlinks, sizeof(devlinks), &property[9]); |
912541b0 KS |
423 | slink = devlinks; |
424 | next = strchr(slink, ' '); | |
425 | while (next != NULL) { | |
426 | next[0] = '\0'; | |
8a173387 | 427 | udev_device_add_devlink(udev_device, slink); |
912541b0 KS |
428 | slink = &next[1]; |
429 | next = strchr(slink, ' '); | |
430 | } | |
431 | if (slink[0] != '\0') | |
8a173387 | 432 | udev_device_add_devlink(udev_device, slink); |
33502ffe | 433 | } else if (startswith(property, "TAGS=")) { |
912541b0 KS |
434 | char tags[UTIL_PATH_SIZE]; |
435 | char *next; | |
436 | ||
d5a89d7d | 437 | strscpy(tags, sizeof(tags), &property[5]); |
912541b0 KS |
438 | next = strchr(tags, ':'); |
439 | if (next != NULL) { | |
440 | next++; | |
441 | while (next[0] != '\0') { | |
442 | char *tag; | |
443 | ||
444 | tag = next; | |
445 | next = strchr(tag, ':'); | |
446 | if (next == NULL) | |
447 | break; | |
448 | next[0] = '\0'; | |
449 | next++; | |
450 | udev_device_add_tag(udev_device, tag); | |
451 | } | |
452 | } | |
33502ffe | 453 | } else if (startswith(property, "USEC_INITIALIZED=")) { |
912541b0 | 454 | udev_device_set_usec_initialized(udev_device, strtoull(&property[19], NULL, 10)); |
33502ffe | 455 | } else if (startswith(property, "DRIVER=")) { |
912541b0 | 456 | udev_device_set_driver(udev_device, &property[7]); |
33502ffe | 457 | } else if (startswith(property, "ACTION=")) { |
912541b0 | 458 | udev_device_set_action(udev_device, &property[7]); |
33502ffe | 459 | } else if (startswith(property, "MAJOR=")) { |
912541b0 | 460 | udev_device->maj = strtoull(&property[6], NULL, 10); |
33502ffe | 461 | } else if (startswith(property, "MINOR=")) { |
912541b0 | 462 | udev_device->min = strtoull(&property[6], NULL, 10); |
33502ffe | 463 | } else if (startswith(property, "DEVPATH_OLD=")) { |
912541b0 | 464 | udev_device_set_devpath_old(udev_device, &property[12]); |
33502ffe | 465 | } else if (startswith(property, "SEQNUM=")) { |
912541b0 | 466 | udev_device_set_seqnum(udev_device, strtoull(&property[7], NULL, 10)); |
33502ffe | 467 | } else if (startswith(property, "IFINDEX=")) { |
912541b0 | 468 | udev_device_set_ifindex(udev_device, strtoull(&property[8], NULL, 10)); |
33502ffe | 469 | } else if (startswith(property, "DEVMODE=")) { |
912541b0 | 470 | udev_device_set_devnode_mode(udev_device, strtoul(&property[8], NULL, 8)); |
1edefa4f KS |
471 | } else if (startswith(property, "DEVUID=")) { |
472 | udev_device_set_devnode_uid(udev_device, strtoul(&property[7], NULL, 10)); | |
473 | } else if (startswith(property, "DEVGID=")) { | |
474 | udev_device_set_devnode_gid(udev_device, strtoul(&property[7], NULL, 10)); | |
912541b0 KS |
475 | } else { |
476 | udev_device_add_property_from_string(udev_device, property); | |
477 | } | |
fc8d61c5 KS |
478 | } |
479 | ||
480 | int udev_device_add_property_from_string_parse_finish(struct udev_device *udev_device) | |
481 | { | |
912541b0 KS |
482 | if (udev_device->maj > 0) |
483 | udev_device_set_devnum(udev_device, makedev(udev_device->maj, udev_device->min)); | |
484 | udev_device->maj = 0; | |
485 | udev_device->min = 0; | |
fc8d61c5 | 486 | |
912541b0 KS |
487 | if (udev_device->devpath == NULL || udev_device->subsystem == NULL) |
488 | return -EINVAL; | |
489 | return 0; | |
fc8d61c5 KS |
490 | } |
491 | ||
492 | /** | |
493 | * udev_device_get_property_value: | |
494 | * @udev_device: udev device | |
495 | * @key: property name | |
496 | * | |
21dbe43a KS |
497 | * Get the value of a given property. |
498 | * | |
499 | * Returns: the property string, or #NULL if there is no such property. | |
fc8d61c5 | 500 | **/ |
54cf0b7f | 501 | _public_ const char *udev_device_get_property_value(struct udev_device *udev_device, const char *key) |
fc8d61c5 | 502 | { |
912541b0 | 503 | struct udev_list_entry *list_entry; |
fc8d61c5 | 504 | |
912541b0 KS |
505 | if (udev_device == NULL) |
506 | return NULL; | |
507 | if (key == NULL) | |
508 | return NULL; | |
fc8d61c5 | 509 | |
912541b0 KS |
510 | list_entry = udev_device_get_properties_list_entry(udev_device); |
511 | list_entry = udev_list_entry_get_by_name(list_entry, key); | |
512 | return udev_list_entry_get_value(list_entry); | |
fc8d61c5 KS |
513 | } |
514 | ||
5f59fa09 | 515 | int udev_device_read_db(struct udev_device *udev_device, const char *dbfile) |
e88a82b5 | 516 | { |
912541b0 KS |
517 | char filename[UTIL_PATH_SIZE]; |
518 | char line[UTIL_LINE_SIZE]; | |
519 | FILE *f; | |
520 | ||
521 | /* providing a database file will always force-load it */ | |
522 | if (dbfile == NULL) { | |
523 | const char *id; | |
524 | ||
525 | if (udev_device->db_loaded) | |
526 | return 0; | |
527 | udev_device->db_loaded = true; | |
528 | ||
529 | id = udev_device_get_id_filename(udev_device); | |
530 | if (id == NULL) | |
531 | return -1; | |
d5a89d7d | 532 | strscpyl(filename, sizeof(filename), "/run/udev/data/", id, NULL); |
912541b0 KS |
533 | dbfile = filename; |
534 | } | |
535 | ||
536 | f = fopen(dbfile, "re"); | |
4a62c710 MS |
537 | if (f == NULL) |
538 | return log_debug_errno(errno, "no db file to read %s: %m", dbfile); | |
f6613dd9 KS |
539 | |
540 | /* devices with a database entry are initialized */ | |
912541b0 KS |
541 | udev_device->is_initialized = true; |
542 | ||
543 | while (fgets(line, sizeof(line), f)) { | |
544 | ssize_t len; | |
545 | const char *val; | |
546 | struct udev_list_entry *entry; | |
547 | ||
548 | len = strlen(line); | |
549 | if (len < 4) | |
550 | break; | |
551 | line[len-1] = '\0'; | |
552 | val = &line[2]; | |
553 | switch(line[0]) { | |
554 | case 'S': | |
d5a89d7d | 555 | strscpyl(filename, sizeof(filename), "/dev/", val, NULL); |
8a173387 | 556 | udev_device_add_devlink(udev_device, filename); |
912541b0 KS |
557 | break; |
558 | case 'L': | |
559 | udev_device_set_devlink_priority(udev_device, atoi(val)); | |
560 | break; | |
561 | case 'E': | |
562 | entry = udev_device_add_property_from_string(udev_device, val); | |
563 | udev_list_entry_set_num(entry, true); | |
564 | break; | |
565 | case 'G': | |
566 | udev_device_add_tag(udev_device, val); | |
567 | break; | |
568 | case 'W': | |
569 | udev_device_set_watch_handle(udev_device, atoi(val)); | |
570 | break; | |
571 | case 'I': | |
572 | udev_device_set_usec_initialized(udev_device, strtoull(val, NULL, 10)); | |
573 | break; | |
574 | } | |
575 | } | |
576 | fclose(f); | |
577 | ||
ff49bc32 | 578 | log_debug("device %p filled with db file data", udev_device); |
912541b0 | 579 | return 0; |
e88a82b5 KS |
580 | } |
581 | ||
bd85566c | 582 | int udev_device_read_uevent_file(struct udev_device *udev_device) |
99214844 | 583 | { |
912541b0 KS |
584 | char filename[UTIL_PATH_SIZE]; |
585 | FILE *f; | |
586 | char line[UTIL_LINE_SIZE]; | |
587 | int maj = 0; | |
588 | int min = 0; | |
589 | ||
590 | if (udev_device->uevent_loaded) | |
591 | return 0; | |
592 | ||
d5a89d7d | 593 | strscpyl(filename, sizeof(filename), udev_device->syspath, "/uevent", NULL); |
912541b0 KS |
594 | f = fopen(filename, "re"); |
595 | if (f == NULL) | |
994e0234 | 596 | return -errno; |
912541b0 KS |
597 | udev_device->uevent_loaded = true; |
598 | ||
599 | while (fgets(line, sizeof(line), f)) { | |
600 | char *pos; | |
601 | ||
602 | pos = strchr(line, '\n'); | |
603 | if (pos == NULL) | |
604 | continue; | |
605 | pos[0] = '\0'; | |
606 | ||
33502ffe | 607 | if (startswith(line, "DEVTYPE=")) { |
912541b0 | 608 | udev_device_set_devtype(udev_device, &line[8]); |
d2b795f2 KS |
609 | continue; |
610 | } | |
33502ffe | 611 | if (startswith(line, "IFINDEX=")) { |
d2b795f2 KS |
612 | udev_device_set_ifindex(udev_device, strtoull(&line[8], NULL, 10)); |
613 | continue; | |
614 | } | |
33502ffe | 615 | if (startswith(line, "DEVNAME=")) { |
d2b795f2 KS |
616 | udev_device_set_devnode(udev_device, &line[8]); |
617 | continue; | |
618 | } | |
619 | ||
33502ffe | 620 | if (startswith(line, "MAJOR=")) |
912541b0 | 621 | maj = strtoull(&line[6], NULL, 10); |
33502ffe | 622 | else if (startswith(line, "MINOR=")) |
912541b0 | 623 | min = strtoull(&line[6], NULL, 10); |
33502ffe | 624 | else if (startswith(line, "DEVMODE=")) |
912541b0 KS |
625 | udev_device->devnode_mode = strtoul(&line[8], NULL, 8); |
626 | ||
627 | udev_device_add_property_from_string(udev_device, line); | |
628 | } | |
629 | ||
630 | udev_device->devnum = makedev(maj, min); | |
631 | fclose(f); | |
632 | return 0; | |
99214844 KS |
633 | } |
634 | ||
8cd2e972 | 635 | void udev_device_set_info_loaded(struct udev_device *device) |
99214844 | 636 | { |
912541b0 | 637 | device->info_loaded = true; |
99214844 KS |
638 | } |
639 | ||
a5710160 | 640 | struct udev_device *udev_device_new(struct udev *udev) |
eb1f0e66 | 641 | { |
912541b0 | 642 | struct udev_device *udev_device; |
912541b0 | 643 | |
aa0e72ea TG |
644 | if (udev == NULL) { |
645 | errno = EINVAL; | |
912541b0 | 646 | return NULL; |
aa0e72ea | 647 | } |
912541b0 | 648 | |
955d98c9 | 649 | udev_device = new0(struct udev_device, 1); |
aa0e72ea TG |
650 | if (udev_device == NULL) { |
651 | errno = ENOMEM; | |
912541b0 | 652 | return NULL; |
aa0e72ea | 653 | } |
912541b0 KS |
654 | udev_device->refcount = 1; |
655 | udev_device->udev = udev; | |
656 | udev_list_init(udev, &udev_device->devlinks_list, true); | |
657 | udev_list_init(udev, &udev_device->properties_list, true); | |
658 | udev_list_init(udev, &udev_device->sysattr_value_list, true); | |
659 | udev_list_init(udev, &udev_device->sysattr_list, false); | |
660 | udev_list_init(udev, &udev_device->tags_list, true); | |
661 | udev_device->watch_handle = -1; | |
41b848b0 | 662 | |
912541b0 | 663 | return udev_device; |
eb1f0e66 KS |
664 | } |
665 | ||
666 | /** | |
8753fadf | 667 | * udev_device_new_from_syspath: |
eb1f0e66 | 668 | * @udev: udev library context |
8753fadf | 669 | * @syspath: sys device path including sys directory |
eb1f0e66 | 670 | * |
8753fadf | 671 | * Create new udev device, and fill in information from the sys |
214a6c79 | 672 | * device and the udev database entry. The syspath is the absolute |
8753fadf | 673 | * path to the device, including the sys mount point. |
eb1f0e66 KS |
674 | * |
675 | * The initial refcount is 1, and needs to be decremented to | |
be7de409 | 676 | * release the resources of the udev device. |
eb1f0e66 KS |
677 | * |
678 | * Returns: a new udev device, or #NULL, if it does not exist | |
679 | **/ | |
54cf0b7f | 680 | _public_ struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *syspath) |
eb1f0e66 | 681 | { |
912541b0 KS |
682 | const char *subdir; |
683 | char path[UTIL_PATH_SIZE]; | |
684 | char *pos; | |
685 | struct stat statbuf; | |
686 | struct udev_device *udev_device; | |
687 | ||
aa0e72ea TG |
688 | if (udev == NULL) { |
689 | errno = EINVAL; | |
912541b0 | 690 | return NULL; |
aa0e72ea TG |
691 | } |
692 | ||
693 | if (syspath == NULL) { | |
694 | errno = EINVAL; | |
912541b0 | 695 | return NULL; |
aa0e72ea | 696 | } |
912541b0 KS |
697 | |
698 | /* path starts in sys */ | |
4cb72937 | 699 | if (!startswith(syspath, "/sys")) { |
ff49bc32 | 700 | log_debug("not in sys :%s", syspath); |
aa0e72ea | 701 | errno = EINVAL; |
912541b0 KS |
702 | return NULL; |
703 | } | |
704 | ||
705 | /* path is not a root directory */ | |
4cb72937 | 706 | subdir = syspath + strlen("/sys"); |
912541b0 | 707 | pos = strrchr(subdir, '/'); |
aa0e72ea TG |
708 | if (pos == NULL || pos[1] == '\0' || pos < &subdir[2]) { |
709 | errno = EINVAL; | |
912541b0 | 710 | return NULL; |
aa0e72ea | 711 | } |
912541b0 KS |
712 | |
713 | /* resolve possible symlink to real path */ | |
d5a89d7d | 714 | strscpy(path, sizeof(path), syspath); |
912541b0 KS |
715 | util_resolve_sys_link(udev, path, sizeof(path)); |
716 | ||
4cb72937 | 717 | if (startswith(path + strlen("/sys"), "/devices/")) { |
912541b0 KS |
718 | char file[UTIL_PATH_SIZE]; |
719 | ||
720 | /* all "devices" require a "uevent" file */ | |
d5a89d7d | 721 | strscpyl(file, sizeof(file), path, "/uevent", NULL); |
baa30fbc | 722 | if (stat(file, &statbuf) != 0) |
912541b0 | 723 | return NULL; |
912541b0 KS |
724 | } else { |
725 | /* everything else just needs to be a directory */ | |
154e6f23 | 726 | if (stat(path, &statbuf) != 0) |
912541b0 | 727 | return NULL; |
154e6f23 LP |
728 | |
729 | if (!S_ISDIR(statbuf.st_mode)) { | |
730 | errno = EISDIR; | |
731 | return NULL; | |
732 | } | |
912541b0 KS |
733 | } |
734 | ||
735 | udev_device = udev_device_new(udev); | |
736 | if (udev_device == NULL) | |
737 | return NULL; | |
738 | ||
739 | udev_device_set_syspath(udev_device, path); | |
ff49bc32 | 740 | log_debug("device %p has devpath '%s'", udev_device, udev_device_get_devpath(udev_device)); |
912541b0 KS |
741 | |
742 | return udev_device; | |
eb1f0e66 KS |
743 | } |
744 | ||
1e511322 KS |
745 | /** |
746 | * udev_device_new_from_devnum: | |
747 | * @udev: udev library context | |
748 | * @type: char or block device | |
749 | * @devnum: device major/minor number | |
750 | * | |
751 | * Create new udev device, and fill in information from the sys | |
dbba7e40 KS |
752 | * device and the udev database entry. The device is looked-up |
753 | * by its major/minor number and type. Character and block device | |
754 | * numbers are not unique across the two types. | |
1e511322 KS |
755 | * |
756 | * The initial refcount is 1, and needs to be decremented to | |
757 | * release the resources of the udev device. | |
758 | * | |
759 | * Returns: a new udev device, or #NULL, if it does not exist | |
760 | **/ | |
54cf0b7f | 761 | _public_ struct udev_device *udev_device_new_from_devnum(struct udev *udev, char type, dev_t devnum) |
4c9dff47 | 762 | { |
912541b0 KS |
763 | char path[UTIL_PATH_SIZE]; |
764 | const char *type_str; | |
03198b93 | 765 | |
912541b0 KS |
766 | if (type == 'b') |
767 | type_str = "block"; | |
768 | else if (type == 'c') | |
769 | type_str = "char"; | |
aa0e72ea TG |
770 | else { |
771 | errno = EINVAL; | |
912541b0 | 772 | return NULL; |
aa0e72ea | 773 | } |
4c9dff47 | 774 | |
912541b0 | 775 | /* use /sys/dev/{block,char}/<maj>:<min> link */ |
4cb72937 | 776 | snprintf(path, sizeof(path), "/sys/dev/%s/%u:%u", |
6ada823a | 777 | type_str, major(devnum), minor(devnum)); |
912541b0 | 778 | return udev_device_new_from_syspath(udev, path); |
4c9dff47 KS |
779 | } |
780 | ||
dbf61afb KS |
781 | /** |
782 | * udev_device_new_from_device_id: | |
783 | * @udev: udev library context | |
784 | * @id: text string identifying a kernel device | |
785 | * | |
786 | * Create new udev device, and fill in information from the sys | |
787 | * device and the udev database entry. The device is looked-up | |
788 | * by a special string: | |
789 | * b8:2 - block device major:minor | |
790 | * c128:1 - char device major:minor | |
791 | * n3 - network device ifindex | |
792 | * +sound:card29 - kernel driver core subsystem:device name | |
793 | * | |
794 | * The initial refcount is 1, and needs to be decremented to | |
795 | * release the resources of the udev device. | |
796 | * | |
797 | * Returns: a new udev device, or #NULL, if it does not exist | |
798 | **/ | |
67410e9f | 799 | _public_ struct udev_device *udev_device_new_from_device_id(struct udev *udev, const char *id) |
cad40a5f | 800 | { |
912541b0 KS |
801 | char type; |
802 | int maj, min; | |
803 | char subsys[UTIL_PATH_SIZE]; | |
804 | char *sysname; | |
805 | ||
806 | switch(id[0]) { | |
807 | case 'b': | |
808 | case 'c': | |
809 | if (sscanf(id, "%c%i:%i", &type, &maj, &min) != 3) | |
810 | return NULL; | |
811 | return udev_device_new_from_devnum(udev, type, makedev(maj, min)); | |
812 | case 'n': { | |
813 | int sk; | |
814 | struct ifreq ifr; | |
815 | struct udev_device *dev; | |
816 | int ifindex; | |
817 | ||
818 | ifindex = strtoul(&id[1], NULL, 10); | |
aa0e72ea TG |
819 | if (ifindex <= 0) { |
820 | errno = EINVAL; | |
912541b0 | 821 | return NULL; |
aa0e72ea | 822 | } |
912541b0 KS |
823 | |
824 | sk = socket(PF_INET, SOCK_DGRAM, 0); | |
825 | if (sk < 0) | |
826 | return NULL; | |
29804cc1 | 827 | memzero(&ifr, sizeof(struct ifreq)); |
912541b0 KS |
828 | ifr.ifr_ifindex = ifindex; |
829 | if (ioctl(sk, SIOCGIFNAME, &ifr) != 0) { | |
830 | close(sk); | |
831 | return NULL; | |
832 | } | |
833 | close(sk); | |
834 | ||
835 | dev = udev_device_new_from_subsystem_sysname(udev, "net", ifr.ifr_name); | |
836 | if (dev == NULL) | |
837 | return NULL; | |
838 | if (udev_device_get_ifindex(dev) == ifindex) | |
839 | return dev; | |
aa0e72ea TG |
840 | |
841 | /* this is racy, so we may end up with the wrong device */ | |
912541b0 | 842 | udev_device_unref(dev); |
aa0e72ea | 843 | errno = ENODEV; |
912541b0 KS |
844 | return NULL; |
845 | } | |
846 | case '+': | |
d5a89d7d | 847 | strscpy(subsys, sizeof(subsys), &id[1]); |
912541b0 | 848 | sysname = strchr(subsys, ':'); |
aa0e72ea TG |
849 | if (sysname == NULL) { |
850 | errno = EINVAL; | |
912541b0 | 851 | return NULL; |
aa0e72ea | 852 | } |
912541b0 KS |
853 | sysname[0] = '\0'; |
854 | sysname = &sysname[1]; | |
855 | return udev_device_new_from_subsystem_sysname(udev, subsys, sysname); | |
856 | default: | |
aa0e72ea | 857 | errno = EINVAL; |
912541b0 KS |
858 | return NULL; |
859 | } | |
cad40a5f KS |
860 | } |
861 | ||
1e511322 KS |
862 | /** |
863 | * udev_device_new_from_subsystem_sysname: | |
864 | * @udev: udev library context | |
214a6c79 | 865 | * @subsystem: the subsystem of the device |
1e511322 KS |
866 | * @sysname: the name of the device |
867 | * | |
dbba7e40 KS |
868 | * Create new udev device, and fill in information from the sys device |
869 | * and the udev database entry. The device is looked up by the subsystem | |
870 | * and name string of the device, like "mem" / "zero", or "block" / "sda". | |
1e511322 KS |
871 | * |
872 | * The initial refcount is 1, and needs to be decremented to | |
873 | * release the resources of the udev device. | |
874 | * | |
875 | * Returns: a new udev device, or #NULL, if it does not exist | |
876 | **/ | |
54cf0b7f | 877 | _public_ struct udev_device *udev_device_new_from_subsystem_sysname(struct udev *udev, const char *subsystem, const char *sysname) |
90d80c2e | 878 | { |
6ada823a | 879 | char path[UTIL_PATH_SIZE]; |
912541b0 KS |
880 | struct stat statbuf; |
881 | ||
33502ffe | 882 | if (streq(subsystem, "subsystem")) { |
d5a89d7d | 883 | strscpyl(path, sizeof(path), "/sys/subsystem/", sysname, NULL); |
6ada823a | 884 | if (stat(path, &statbuf) == 0) |
912541b0 KS |
885 | goto found; |
886 | ||
d5a89d7d | 887 | strscpyl(path, sizeof(path), "/sys/bus/", sysname, NULL); |
6ada823a | 888 | if (stat(path, &statbuf) == 0) |
912541b0 KS |
889 | goto found; |
890 | ||
d5a89d7d | 891 | strscpyl(path, sizeof(path), "/sys/class/", sysname, NULL); |
6ada823a | 892 | if (stat(path, &statbuf) == 0) |
912541b0 KS |
893 | goto found; |
894 | goto out; | |
895 | } | |
896 | ||
33502ffe | 897 | if (streq(subsystem, "module")) { |
d5a89d7d | 898 | strscpyl(path, sizeof(path), "/sys/module/", sysname, NULL); |
6ada823a | 899 | if (stat(path, &statbuf) == 0) |
912541b0 KS |
900 | goto found; |
901 | goto out; | |
902 | } | |
903 | ||
33502ffe | 904 | if (streq(subsystem, "drivers")) { |
912541b0 KS |
905 | char subsys[UTIL_NAME_SIZE]; |
906 | char *driver; | |
907 | ||
d5a89d7d | 908 | strscpy(subsys, sizeof(subsys), sysname); |
912541b0 KS |
909 | driver = strchr(subsys, ':'); |
910 | if (driver != NULL) { | |
911 | driver[0] = '\0'; | |
912 | driver = &driver[1]; | |
913 | ||
d5a89d7d | 914 | strscpyl(path, sizeof(path), "/sys/subsystem/", subsys, "/drivers/", driver, NULL); |
6ada823a | 915 | if (stat(path, &statbuf) == 0) |
912541b0 KS |
916 | goto found; |
917 | ||
d5a89d7d | 918 | strscpyl(path, sizeof(path), "/sys/bus/", subsys, "/drivers/", driver, NULL); |
6ada823a | 919 | if (stat(path, &statbuf) == 0) |
912541b0 | 920 | goto found; |
aa0e72ea TG |
921 | } else |
922 | errno = EINVAL; | |
923 | ||
912541b0 KS |
924 | goto out; |
925 | } | |
926 | ||
d5a89d7d | 927 | strscpyl(path, sizeof(path), "/sys/subsystem/", subsystem, "/devices/", sysname, NULL); |
6ada823a | 928 | if (stat(path, &statbuf) == 0) |
912541b0 KS |
929 | goto found; |
930 | ||
d5a89d7d | 931 | strscpyl(path, sizeof(path), "/sys/bus/", subsystem, "/devices/", sysname, NULL); |
6ada823a | 932 | if (stat(path, &statbuf) == 0) |
912541b0 KS |
933 | goto found; |
934 | ||
d5a89d7d | 935 | strscpyl(path, sizeof(path), "/sys/class/", subsystem, "/", sysname, NULL); |
6ada823a | 936 | if (stat(path, &statbuf) == 0) |
912541b0 | 937 | goto found; |
90d80c2e | 938 | out: |
912541b0 | 939 | return NULL; |
90d80c2e | 940 | found: |
6ada823a | 941 | return udev_device_new_from_syspath(udev, path); |
90d80c2e KS |
942 | } |
943 | ||
fc8d61c5 KS |
944 | /** |
945 | * udev_device_new_from_environment | |
946 | * @udev: udev library context | |
947 | * | |
948 | * Create new udev device, and fill in information from the | |
949 | * current process environment. This only works reliable if | |
950 | * the process is called from a udev rule. It is usually used | |
951 | * for tools executed from IMPORT= rules. | |
952 | * | |
953 | * The initial refcount is 1, and needs to be decremented to | |
954 | * release the resources of the udev device. | |
955 | * | |
956 | * Returns: a new udev device, or #NULL, if it does not exist | |
957 | **/ | |
54cf0b7f | 958 | _public_ struct udev_device *udev_device_new_from_environment(struct udev *udev) |
fc8d61c5 | 959 | { |
912541b0 KS |
960 | int i; |
961 | struct udev_device *udev_device; | |
fc8d61c5 | 962 | |
912541b0 KS |
963 | udev_device = udev_device_new(udev); |
964 | if (udev_device == NULL) | |
965 | return NULL; | |
966 | udev_device_set_info_loaded(udev_device); | |
fc8d61c5 | 967 | |
912541b0 KS |
968 | for (i = 0; environ[i] != NULL; i++) |
969 | udev_device_add_property_from_string_parse(udev_device, environ[i]); | |
fc8d61c5 | 970 | |
912541b0 | 971 | if (udev_device_add_property_from_string_parse_finish(udev_device) < 0) { |
ff49bc32 | 972 | log_debug("missing values, invalid device"); |
912541b0 KS |
973 | udev_device_unref(udev_device); |
974 | udev_device = NULL; | |
975 | } | |
fc8d61c5 | 976 | |
912541b0 | 977 | return udev_device; |
fc8d61c5 KS |
978 | } |
979 | ||
b2d9e4f2 | 980 | static struct udev_device *device_new_from_parent(struct udev_device *udev_device) |
4ad3a37f | 981 | { |
912541b0 KS |
982 | struct udev_device *udev_device_parent = NULL; |
983 | char path[UTIL_PATH_SIZE]; | |
984 | const char *subdir; | |
4ad3a37f | 985 | |
d5a89d7d | 986 | strscpy(path, sizeof(path), udev_device->syspath); |
4cb72937 | 987 | subdir = path + strlen("/sys/"); |
912541b0 KS |
988 | for (;;) { |
989 | char *pos; | |
b95f8a76 | 990 | |
912541b0 KS |
991 | pos = strrchr(subdir, '/'); |
992 | if (pos == NULL || pos < &subdir[2]) | |
993 | break; | |
994 | pos[0] = '\0'; | |
995 | udev_device_parent = udev_device_new_from_syspath(udev_device->udev, path); | |
996 | if (udev_device_parent != NULL) | |
997 | return udev_device_parent; | |
998 | } | |
aa0e72ea TG |
999 | |
1000 | errno = ENOENT; | |
912541b0 | 1001 | return NULL; |
4ad3a37f KS |
1002 | } |
1003 | ||
1e511322 KS |
1004 | /** |
1005 | * udev_device_get_parent: | |
1006 | * @udev_device: the device to start searching from | |
1007 | * | |
1008 | * Find the next parent device, and fill in information from the sys | |
1009 | * device and the udev database entry. | |
1010 | * | |
572ce4f7 ZJS |
1011 | * Returned device is not referenced. It is attached to the child |
1012 | * device, and will be cleaned up when the child device is cleaned up. | |
1e511322 | 1013 | * |
214a6c79 | 1014 | * It is not necessarily just the upper level directory, empty or not |
1e511322 KS |
1015 | * recognized sys directories are ignored. |
1016 | * | |
1017 | * It can be called as many times as needed, without caring about | |
1018 | * references. | |
1019 | * | |
1020 | * Returns: a new udev device, or #NULL, if it no parent exist. | |
1021 | **/ | |
54cf0b7f | 1022 | _public_ struct udev_device *udev_device_get_parent(struct udev_device *udev_device) |
b2d9e4f2 | 1023 | { |
aa0e72ea TG |
1024 | if (udev_device == NULL) { |
1025 | errno = EINVAL; | |
912541b0 | 1026 | return NULL; |
aa0e72ea | 1027 | } |
912541b0 KS |
1028 | if (!udev_device->parent_set) { |
1029 | udev_device->parent_set = true; | |
1030 | udev_device->parent_device = device_new_from_parent(udev_device); | |
1031 | } | |
912541b0 | 1032 | return udev_device->parent_device; |
b2d9e4f2 KS |
1033 | } |
1034 | ||
1e511322 KS |
1035 | /** |
1036 | * udev_device_get_parent_with_subsystem_devtype: | |
1037 | * @udev_device: udev device to start searching from | |
214a6c79 | 1038 | * @subsystem: the subsystem of the device |
1e511322 KS |
1039 | * @devtype: the type (DEVTYPE) of the device |
1040 | * | |
1041 | * Find the next parent device, with a matching subsystem and devtype | |
1042 | * value, and fill in information from the sys device and the udev | |
1043 | * database entry. | |
1044 | * | |
79ef2e97 | 1045 | * If devtype is #NULL, only subsystem is checked, and any devtype will |
54d4f54e MP |
1046 | * match. |
1047 | * | |
572ce4f7 ZJS |
1048 | * Returned device is not referenced. It is attached to the child |
1049 | * device, and will be cleaned up when the child device is cleaned up. | |
1e511322 KS |
1050 | * |
1051 | * It can be called as many times as needed, without caring about | |
1052 | * references. | |
1053 | * | |
8d6bc73a | 1054 | * Returns: a new udev device, or #NULL if no matching parent exists. |
1e511322 | 1055 | **/ |
54cf0b7f | 1056 | _public_ struct udev_device *udev_device_get_parent_with_subsystem_devtype(struct udev_device *udev_device, const char *subsystem, const char *devtype) |
bf8b2ae1 | 1057 | { |
912541b0 | 1058 | struct udev_device *parent; |
bf8b2ae1 | 1059 | |
aa0e72ea TG |
1060 | if (subsystem == NULL) { |
1061 | errno = EINVAL; | |
912541b0 | 1062 | return NULL; |
aa0e72ea | 1063 | } |
883012d4 | 1064 | |
912541b0 KS |
1065 | parent = udev_device_get_parent(udev_device); |
1066 | while (parent != NULL) { | |
1067 | const char *parent_subsystem; | |
1068 | const char *parent_devtype; | |
bf8b2ae1 | 1069 | |
912541b0 | 1070 | parent_subsystem = udev_device_get_subsystem(parent); |
33502ffe | 1071 | if (parent_subsystem != NULL && streq(parent_subsystem, subsystem)) { |
912541b0 KS |
1072 | if (devtype == NULL) |
1073 | break; | |
1074 | parent_devtype = udev_device_get_devtype(parent); | |
33502ffe | 1075 | if (parent_devtype != NULL && streq(parent_devtype, devtype)) |
912541b0 KS |
1076 | break; |
1077 | } | |
1078 | parent = udev_device_get_parent(parent); | |
1079 | } | |
aa0e72ea TG |
1080 | |
1081 | if (!parent) | |
1082 | errno = ENOENT; | |
1083 | ||
912541b0 | 1084 | return parent; |
bf8b2ae1 MH |
1085 | } |
1086 | ||
eb1f0e66 KS |
1087 | /** |
1088 | * udev_device_get_udev: | |
7d8787b3 | 1089 | * @udev_device: udev device |
eb1f0e66 KS |
1090 | * |
1091 | * Retrieve the udev library context the device was created with. | |
1092 | * | |
1093 | * Returns: the udev library context | |
1094 | **/ | |
54cf0b7f | 1095 | _public_ struct udev *udev_device_get_udev(struct udev_device *udev_device) |
eb1f0e66 | 1096 | { |
912541b0 KS |
1097 | if (udev_device == NULL) |
1098 | return NULL; | |
1099 | return udev_device->udev; | |
eb1f0e66 KS |
1100 | } |
1101 | ||
1102 | /** | |
1103 | * udev_device_ref: | |
1104 | * @udev_device: udev device | |
1105 | * | |
1106 | * Take a reference of a udev device. | |
1107 | * | |
1108 | * Returns: the passed udev device | |
1109 | **/ | |
54cf0b7f | 1110 | _public_ struct udev_device *udev_device_ref(struct udev_device *udev_device) |
eb1f0e66 | 1111 | { |
912541b0 KS |
1112 | if (udev_device == NULL) |
1113 | return NULL; | |
1114 | udev_device->refcount++; | |
1115 | return udev_device; | |
eb1f0e66 KS |
1116 | } |
1117 | ||
1118 | /** | |
1119 | * udev_device_unref: | |
1120 | * @udev_device: udev device | |
1121 | * | |
1122 | * Drop a reference of a udev device. If the refcount reaches zero, | |
be7de409 | 1123 | * the resources of the device will be released. |
eb1f0e66 | 1124 | * |
725d7e6c | 1125 | * Returns: #NULL |
eb1f0e66 | 1126 | **/ |
20bbd54f | 1127 | _public_ struct udev_device *udev_device_unref(struct udev_device *udev_device) |
eb1f0e66 | 1128 | { |
912541b0 | 1129 | if (udev_device == NULL) |
20bbd54f | 1130 | return NULL; |
912541b0 KS |
1131 | udev_device->refcount--; |
1132 | if (udev_device->refcount > 0) | |
725d7e6c | 1133 | return NULL; |
912541b0 KS |
1134 | if (udev_device->parent_device != NULL) |
1135 | udev_device_unref(udev_device->parent_device); | |
1136 | free(udev_device->syspath); | |
1137 | free(udev_device->sysname); | |
1138 | free(udev_device->devnode); | |
1139 | free(udev_device->subsystem); | |
1140 | free(udev_device->devtype); | |
1141 | udev_list_cleanup(&udev_device->devlinks_list); | |
1142 | udev_list_cleanup(&udev_device->properties_list); | |
1143 | udev_list_cleanup(&udev_device->sysattr_value_list); | |
1144 | udev_list_cleanup(&udev_device->sysattr_list); | |
1145 | udev_list_cleanup(&udev_device->tags_list); | |
1146 | free(udev_device->action); | |
1147 | free(udev_device->driver); | |
1148 | free(udev_device->devpath_old); | |
1149 | free(udev_device->id_filename); | |
1150 | free(udev_device->envp); | |
1151 | free(udev_device->monitor_buf); | |
912541b0 | 1152 | free(udev_device); |
20bbd54f | 1153 | return NULL; |
eb1f0e66 KS |
1154 | } |
1155 | ||
1156 | /** | |
1157 | * udev_device_get_devpath: | |
1158 | * @udev_device: udev device | |
1159 | * | |
11d543c1 KS |
1160 | * Retrieve the kernel devpath value of the udev device. The path |
1161 | * does not contain the sys mount point, and starts with a '/'. | |
eb1f0e66 | 1162 | * |
11d543c1 | 1163 | * Returns: the devpath of the udev device |
eb1f0e66 | 1164 | **/ |
54cf0b7f | 1165 | _public_ const char *udev_device_get_devpath(struct udev_device *udev_device) |
eb1f0e66 | 1166 | { |
912541b0 KS |
1167 | if (udev_device == NULL) |
1168 | return NULL; | |
1169 | return udev_device->devpath; | |
eb1f0e66 KS |
1170 | } |
1171 | ||
11d543c1 KS |
1172 | /** |
1173 | * udev_device_get_syspath: | |
1174 | * @udev_device: udev device | |
1175 | * | |
1176 | * Retrieve the sys path of the udev device. The path is an | |
1177 | * absolute path and starts with the sys mount point. | |
1178 | * | |
1179 | * Returns: the sys path of the udev device | |
1180 | **/ | |
54cf0b7f | 1181 | _public_ const char *udev_device_get_syspath(struct udev_device *udev_device) |
11d543c1 | 1182 | { |
912541b0 KS |
1183 | if (udev_device == NULL) |
1184 | return NULL; | |
1185 | return udev_device->syspath; | |
11d543c1 KS |
1186 | } |
1187 | ||
1e511322 KS |
1188 | /** |
1189 | * udev_device_get_sysname: | |
1190 | * @udev_device: udev device | |
1191 | * | |
21dbe43a KS |
1192 | * Get the kernel device name in /sys. |
1193 | * | |
1194 | * Returns: the name string of the device device | |
1e511322 | 1195 | **/ |
54cf0b7f | 1196 | _public_ const char *udev_device_get_sysname(struct udev_device *udev_device) |
4ad3a37f | 1197 | { |
912541b0 KS |
1198 | if (udev_device == NULL) |
1199 | return NULL; | |
1200 | return udev_device->sysname; | |
4ad3a37f KS |
1201 | } |
1202 | ||
1e511322 KS |
1203 | /** |
1204 | * udev_device_get_sysnum: | |
1205 | * @udev_device: udev device | |
1206 | * | |
21dbe43a KS |
1207 | * Get the instance number of the device. |
1208 | * | |
c5315881 | 1209 | * Returns: the trailing number string of the device name |
1e511322 | 1210 | **/ |
54cf0b7f | 1211 | _public_ const char *udev_device_get_sysnum(struct udev_device *udev_device) |
517814e7 | 1212 | { |
912541b0 KS |
1213 | if (udev_device == NULL) |
1214 | return NULL; | |
1215 | return udev_device->sysnum; | |
517814e7 KS |
1216 | } |
1217 | ||
eb1f0e66 | 1218 | /** |
fb762bb9 | 1219 | * udev_device_get_devnode: |
eb1f0e66 KS |
1220 | * @udev_device: udev device |
1221 | * | |
1222 | * Retrieve the device node file name belonging to the udev device. | |
ba6929f6 | 1223 | * The path is an absolute path, and starts with the device directory. |
eb1f0e66 KS |
1224 | * |
1225 | * Returns: the device node file name of the udev device, or #NULL if no device node exists | |
1226 | **/ | |
54cf0b7f | 1227 | _public_ const char *udev_device_get_devnode(struct udev_device *udev_device) |
eb1f0e66 | 1228 | { |
912541b0 KS |
1229 | if (udev_device == NULL) |
1230 | return NULL; | |
1231 | if (udev_device->devnode != NULL) | |
1232 | return udev_device->devnode; | |
1233 | if (!udev_device->info_loaded) | |
1234 | udev_device_read_uevent_file(udev_device); | |
1235 | return udev_device->devnode; | |
eb1f0e66 KS |
1236 | } |
1237 | ||
eb1f0e66 | 1238 | /** |
0de33a61 | 1239 | * udev_device_get_devlinks_list_entry: |
eb1f0e66 | 1240 | * @udev_device: udev device |
eb1f0e66 | 1241 | * |
bf7ad0ea KS |
1242 | * Retrieve the list of device links pointing to the device file of |
1243 | * the udev device. The next list entry can be retrieved with | |
bb061708 | 1244 | * udev_list_entry_get_next(), which returns #NULL if no more entries exist. |
bf7ad0ea | 1245 | * The devlink path can be retrieved from the list entry by |
e345e267 | 1246 | * udev_list_entry_get_name(). The path is an absolute path, and starts with |
bf7ad0ea | 1247 | * the device directory. |
eb1f0e66 | 1248 | * |
bf7ad0ea | 1249 | * Returns: the first entry of the device node link list |
eb1f0e66 | 1250 | **/ |
54cf0b7f | 1251 | _public_ struct udev_list_entry *udev_device_get_devlinks_list_entry(struct udev_device *udev_device) |
eb1f0e66 | 1252 | { |
912541b0 KS |
1253 | if (udev_device == NULL) |
1254 | return NULL; | |
1255 | if (!udev_device->info_loaded) | |
1256 | udev_device_read_db(udev_device, NULL); | |
1257 | return udev_list_get_entry(&udev_device->devlinks_list); | |
eb1f0e66 KS |
1258 | } |
1259 | ||
979ff016 KS |
1260 | void udev_device_cleanup_devlinks_list(struct udev_device *udev_device) |
1261 | { | |
912541b0 KS |
1262 | udev_device->devlinks_uptodate = false; |
1263 | udev_list_cleanup(&udev_device->devlinks_list); | |
979ff016 KS |
1264 | } |
1265 | ||
eb1f0e66 | 1266 | /** |
0de33a61 | 1267 | * udev_device_get_properties_list_entry: |
eb1f0e66 | 1268 | * @udev_device: udev device |
eb1f0e66 | 1269 | * |
bf7ad0ea | 1270 | * Retrieve the list of key/value device properties of the udev |
bb061708 | 1271 | * device. The next list entry can be retrieved with udev_list_entry_get_next(), |
bf7ad0ea | 1272 | * which returns #NULL if no more entries exist. The property name |
bb061708 KS |
1273 | * can be retrieved from the list entry by udev_list_entry_get_name(), |
1274 | * the property value by udev_list_entry_get_value(). | |
eb1f0e66 | 1275 | * |
bf7ad0ea | 1276 | * Returns: the first entry of the property list |
eb1f0e66 | 1277 | **/ |
54cf0b7f | 1278 | _public_ struct udev_list_entry *udev_device_get_properties_list_entry(struct udev_device *udev_device) |
eb1f0e66 | 1279 | { |
912541b0 KS |
1280 | if (udev_device == NULL) |
1281 | return NULL; | |
1282 | if (!udev_device->info_loaded) { | |
1283 | udev_device_read_uevent_file(udev_device); | |
1284 | udev_device_read_db(udev_device, NULL); | |
1285 | } | |
1286 | if (!udev_device->devlinks_uptodate) { | |
1287 | char symlinks[UTIL_PATH_SIZE]; | |
1288 | struct udev_list_entry *list_entry; | |
1289 | ||
1290 | udev_device->devlinks_uptodate = true; | |
1291 | list_entry = udev_device_get_devlinks_list_entry(udev_device); | |
1292 | if (list_entry != NULL) { | |
1293 | char *s; | |
1294 | size_t l; | |
1295 | ||
1296 | s = symlinks; | |
d5a89d7d | 1297 | l = strpcpyl(&s, sizeof(symlinks), udev_list_entry_get_name(list_entry), NULL); |
912541b0 | 1298 | udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry)) |
d5a89d7d | 1299 | l = strpcpyl(&s, l, " ", udev_list_entry_get_name(list_entry), NULL); |
912541b0 KS |
1300 | udev_device_add_property(udev_device, "DEVLINKS", symlinks); |
1301 | } | |
1302 | } | |
1303 | if (!udev_device->tags_uptodate) { | |
1304 | udev_device->tags_uptodate = true; | |
1305 | if (udev_device_get_tags_list_entry(udev_device) != NULL) { | |
1306 | char tags[UTIL_PATH_SIZE]; | |
1307 | struct udev_list_entry *list_entry; | |
1308 | char *s; | |
1309 | size_t l; | |
1310 | ||
1311 | s = tags; | |
d5a89d7d | 1312 | l = strpcpyl(&s, sizeof(tags), ":", NULL); |
912541b0 | 1313 | udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(udev_device)) |
d5a89d7d | 1314 | l = strpcpyl(&s, l, udev_list_entry_get_name(list_entry), ":", NULL); |
912541b0 KS |
1315 | udev_device_add_property(udev_device, "TAGS", tags); |
1316 | } | |
1317 | } | |
1318 | return udev_list_get_entry(&udev_device->properties_list); | |
eb1f0e66 | 1319 | } |
11d543c1 | 1320 | |
1e511322 KS |
1321 | /** |
1322 | * udev_device_get_action: | |
1323 | * @udev_device: udev device | |
1324 | * | |
1325 | * This is only valid if the device was received through a monitor. Devices read from | |
1326 | * sys do not have an action string. Usual actions are: add, remove, change, online, | |
1327 | * offline. | |
1328 | * | |
1329 | * Returns: the kernel action value, or #NULL if there is no action value available. | |
1330 | **/ | |
54cf0b7f | 1331 | _public_ const char *udev_device_get_action(struct udev_device *udev_device) |
c4f5f942 | 1332 | { |
912541b0 KS |
1333 | if (udev_device == NULL) |
1334 | return NULL; | |
1335 | return udev_device->action; | |
c4f5f942 KS |
1336 | } |
1337 | ||
9c6a11b1 KS |
1338 | /** |
1339 | * udev_device_get_usec_since_initialized: | |
1340 | * @udev_device: udev device | |
1341 | * | |
1342 | * Return the number of microseconds passed since udev set up the | |
1343 | * device for the first time. | |
1344 | * | |
1345 | * This is only implemented for devices with need to store properties | |
1346 | * in the udev database. All other devices return 0 here. | |
1347 | * | |
1348 | * Returns: the number of microseconds since the device was first seen. | |
1349 | **/ | |
54cf0b7f | 1350 | _public_ unsigned long long int udev_device_get_usec_since_initialized(struct udev_device *udev_device) |
9c6a11b1 | 1351 | { |
40fe8b11 | 1352 | usec_t now_ts; |
9c6a11b1 | 1353 | |
912541b0 KS |
1354 | if (udev_device == NULL) |
1355 | return 0; | |
1356 | if (!udev_device->info_loaded) | |
1357 | udev_device_read_db(udev_device, NULL); | |
1358 | if (udev_device->usec_initialized == 0) | |
1359 | return 0; | |
40fe8b11 | 1360 | now_ts = now(CLOCK_MONOTONIC); |
33502ffe | 1361 | if (now_ts == 0) |
912541b0 | 1362 | return 0; |
33502ffe | 1363 | return now_ts - udev_device->usec_initialized; |
9c6a11b1 KS |
1364 | } |
1365 | ||
40fe8b11 | 1366 | usec_t udev_device_get_usec_initialized(struct udev_device *udev_device) |
9c6a11b1 | 1367 | { |
912541b0 | 1368 | return udev_device->usec_initialized; |
9c6a11b1 KS |
1369 | } |
1370 | ||
40fe8b11 | 1371 | void udev_device_set_usec_initialized(struct udev_device *udev_device, usec_t usec_initialized) |
9c6a11b1 | 1372 | { |
912541b0 | 1373 | char num[32]; |
a20a57a7 | 1374 | |
912541b0 | 1375 | udev_device->usec_initialized = usec_initialized; |
de0671ee | 1376 | snprintf(num, sizeof(num), USEC_FMT, usec_initialized); |
912541b0 | 1377 | udev_device_add_property(udev_device, "USEC_INITIALIZED", num); |
9c6a11b1 KS |
1378 | } |
1379 | ||
1e511322 KS |
1380 | /** |
1381 | * udev_device_get_sysattr_value: | |
1382 | * @udev_device: udev device | |
1383 | * @sysattr: attribute name | |
1384 | * | |
456719b6 | 1385 | * The retrieved value is cached in the device. Repeated calls will return the same |
1e511322 KS |
1386 | * value and not open the attribute again. |
1387 | * | |
1388 | * Returns: the content of a sys attribute file, or #NULL if there is no sys attribute value. | |
1389 | **/ | |
54cf0b7f | 1390 | _public_ const char *udev_device_get_sysattr_value(struct udev_device *udev_device, const char *sysattr) |
93b0f384 | 1391 | { |
912541b0 KS |
1392 | struct udev_list_entry *list_entry; |
1393 | char path[UTIL_PATH_SIZE]; | |
1394 | char value[4096]; | |
1395 | struct stat statbuf; | |
1396 | int fd; | |
1397 | ssize_t size; | |
1398 | const char *val = NULL; | |
1399 | ||
1400 | if (udev_device == NULL) | |
1401 | return NULL; | |
1402 | if (sysattr == NULL) | |
1403 | return NULL; | |
1404 | ||
1405 | /* look for possibly already cached result */ | |
1406 | list_entry = udev_list_get_entry(&udev_device->sysattr_value_list); | |
1407 | list_entry = udev_list_entry_get_by_name(list_entry, sysattr); | |
baa30fbc | 1408 | if (list_entry != NULL) |
912541b0 | 1409 | return udev_list_entry_get_value(list_entry); |
912541b0 | 1410 | |
d5a89d7d | 1411 | strscpyl(path, sizeof(path), udev_device_get_syspath(udev_device), "/", sysattr, NULL); |
912541b0 | 1412 | if (lstat(path, &statbuf) != 0) { |
912541b0 KS |
1413 | udev_list_entry_add(&udev_device->sysattr_value_list, sysattr, NULL); |
1414 | goto out; | |
1415 | } | |
1416 | ||
1417 | if (S_ISLNK(statbuf.st_mode)) { | |
912541b0 KS |
1418 | /* |
1419 | * Some core links return only the last element of the target path, | |
1420 | * these are just values, the paths should not be exposed. | |
1421 | */ | |
33502ffe KS |
1422 | if (streq(sysattr, "driver") || |
1423 | streq(sysattr, "subsystem") || | |
1424 | streq(sysattr, "module")) { | |
912541b0 KS |
1425 | if (util_get_sys_core_link_value(udev_device->udev, sysattr, |
1426 | udev_device->syspath, value, sizeof(value)) < 0) | |
1427 | return NULL; | |
912541b0 KS |
1428 | list_entry = udev_list_entry_add(&udev_device->sysattr_value_list, sysattr, value); |
1429 | val = udev_list_entry_get_value(list_entry); | |
1430 | goto out; | |
1431 | } | |
1432 | ||
912541b0 KS |
1433 | goto out; |
1434 | } | |
1435 | ||
1436 | /* skip directories */ | |
1437 | if (S_ISDIR(statbuf.st_mode)) | |
1438 | goto out; | |
1439 | ||
1440 | /* skip non-readable files */ | |
1441 | if ((statbuf.st_mode & S_IRUSR) == 0) | |
1442 | goto out; | |
1443 | ||
1444 | /* read attribute value */ | |
1445 | fd = open(path, O_RDONLY|O_CLOEXEC); | |
baa30fbc | 1446 | if (fd < 0) |
912541b0 | 1447 | goto out; |
912541b0 KS |
1448 | size = read(fd, value, sizeof(value)); |
1449 | close(fd); | |
1450 | if (size < 0) | |
1451 | goto out; | |
1452 | if (size == sizeof(value)) | |
1453 | goto out; | |
1454 | ||
1455 | /* got a valid value, store it in cache and return it */ | |
1456 | value[size] = '\0'; | |
1457 | util_remove_trailing_chars(value, '\n'); | |
912541b0 KS |
1458 | list_entry = udev_list_entry_add(&udev_device->sysattr_value_list, sysattr, value); |
1459 | val = udev_list_entry_get_value(list_entry); | |
93b0f384 | 1460 | out: |
912541b0 | 1461 | return val; |
93b0f384 | 1462 | } |
517814e7 | 1463 | |
946f1825 HR |
1464 | /** |
1465 | * udev_device_set_sysattr_value: | |
1466 | * @udev_device: udev device | |
1467 | * @sysattr: attribute name | |
1468 | * @value: new value to be set | |
1469 | * | |
1470 | * Update the contents of the sys attribute and the cached value of the device. | |
1471 | * | |
1472 | * Returns: Negative error code on failure or 0 on success. | |
1473 | **/ | |
1474 | _public_ int udev_device_set_sysattr_value(struct udev_device *udev_device, const char *sysattr, char *value) | |
1475 | { | |
1476 | struct udev_device *dev; | |
1477 | char path[UTIL_PATH_SIZE]; | |
1478 | struct stat statbuf; | |
1479 | int fd; | |
1480 | ssize_t size, value_len; | |
1481 | int ret = 0; | |
1482 | ||
1483 | if (udev_device == NULL) | |
1484 | return -EINVAL; | |
1485 | dev = udev_device; | |
1486 | if (sysattr == NULL) | |
1487 | return -EINVAL; | |
1488 | if (value == NULL) | |
1489 | value_len = 0; | |
1490 | else | |
1491 | value_len = strlen(value); | |
53726349 | 1492 | |
946f1825 HR |
1493 | strscpyl(path, sizeof(path), udev_device_get_syspath(dev), "/", sysattr, NULL); |
1494 | if (lstat(path, &statbuf) != 0) { | |
1495 | udev_list_entry_add(&dev->sysattr_value_list, sysattr, NULL); | |
1496 | ret = -ENXIO; | |
1497 | goto out; | |
1498 | } | |
1499 | ||
1500 | if (S_ISLNK(statbuf.st_mode)) { | |
53726349 | 1501 | ret = -EINVAL; |
946f1825 HR |
1502 | goto out; |
1503 | } | |
1504 | ||
1505 | /* skip directories */ | |
1506 | if (S_ISDIR(statbuf.st_mode)) { | |
1507 | ret = -EISDIR; | |
1508 | goto out; | |
1509 | } | |
1510 | ||
1511 | /* skip non-readable files */ | |
1512 | if ((statbuf.st_mode & S_IRUSR) == 0) { | |
1513 | ret = -EACCES; | |
1514 | goto out; | |
1515 | } | |
1516 | ||
1517 | /* Value is limited to 4k */ | |
1518 | if (value_len > 4096) { | |
1519 | ret = -EINVAL; | |
1520 | goto out; | |
1521 | } | |
1522 | util_remove_trailing_chars(value, '\n'); | |
1523 | ||
1524 | /* write attribute value */ | |
1525 | fd = open(path, O_WRONLY|O_CLOEXEC); | |
1526 | if (fd < 0) { | |
1527 | ret = -errno; | |
1528 | goto out; | |
1529 | } | |
1530 | size = write(fd, value, value_len); | |
1531 | close(fd); | |
1532 | if (size < 0) { | |
1533 | ret = -errno; | |
1534 | goto out; | |
1535 | } | |
1536 | if (size < value_len) { | |
1537 | ret = -EIO; | |
1538 | goto out; | |
1539 | } | |
1540 | ||
1541 | /* wrote a valid value, store it in cache and return it */ | |
1542 | udev_list_entry_add(&dev->sysattr_value_list, sysattr, value); | |
1543 | out: | |
1544 | if (dev != udev_device) | |
1545 | udev_device_unref(dev); | |
1546 | return ret; | |
1547 | } | |
1548 | ||
20bee04c | 1549 | static int udev_device_sysattr_list_read(struct udev_device *udev_device) |
f180ad25 | 1550 | { |
912541b0 KS |
1551 | struct dirent *dent; |
1552 | DIR *dir; | |
1553 | int num = 0; | |
f180ad25 | 1554 | |
912541b0 | 1555 | if (udev_device == NULL) |
994e0234 | 1556 | return -EINVAL; |
912541b0 KS |
1557 | if (udev_device->sysattr_list_read) |
1558 | return 0; | |
f180ad25 | 1559 | |
912541b0 | 1560 | dir = opendir(udev_device_get_syspath(udev_device)); |
baa30fbc | 1561 | if (!dir) |
994e0234 | 1562 | return -errno; |
f180ad25 | 1563 | |
912541b0 KS |
1564 | for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) { |
1565 | char path[UTIL_PATH_SIZE]; | |
1566 | struct stat statbuf; | |
f180ad25 | 1567 | |
912541b0 KS |
1568 | /* only handle symlinks and regular files */ |
1569 | if (dent->d_type != DT_LNK && dent->d_type != DT_REG) | |
1570 | continue; | |
f180ad25 | 1571 | |
d5a89d7d | 1572 | strscpyl(path, sizeof(path), udev_device_get_syspath(udev_device), "/", dent->d_name, NULL); |
912541b0 KS |
1573 | if (lstat(path, &statbuf) != 0) |
1574 | continue; | |
1575 | if ((statbuf.st_mode & S_IRUSR) == 0) | |
1576 | continue; | |
f180ad25 | 1577 | |
912541b0 KS |
1578 | udev_list_entry_add(&udev_device->sysattr_list, dent->d_name, NULL); |
1579 | num++; | |
1580 | } | |
f180ad25 | 1581 | |
912541b0 | 1582 | closedir(dir); |
912541b0 | 1583 | udev_device->sysattr_list_read = true; |
f180ad25 | 1584 | |
912541b0 | 1585 | return num; |
f180ad25 TE |
1586 | } |
1587 | ||
1588 | /** | |
1589 | * udev_device_get_sysattr_list_entry: | |
1590 | * @udev_device: udev device | |
1591 | * | |
1592 | * Retrieve the list of available sysattrs, with value being empty; | |
20bee04c KS |
1593 | * This just return all available sysfs attributes for a particular |
1594 | * device without reading their values. | |
f180ad25 TE |
1595 | * |
1596 | * Returns: the first entry of the property list | |
1597 | **/ | |
54cf0b7f | 1598 | _public_ struct udev_list_entry *udev_device_get_sysattr_list_entry(struct udev_device *udev_device) |
f180ad25 | 1599 | { |
912541b0 KS |
1600 | if (!udev_device->sysattr_list_read) { |
1601 | int ret; | |
1602 | ret = udev_device_sysattr_list_read(udev_device); | |
1603 | if (0 > ret) | |
1604 | return NULL; | |
1605 | } | |
f180ad25 | 1606 | |
912541b0 | 1607 | return udev_list_get_entry(&udev_device->sysattr_list); |
f180ad25 TE |
1608 | } |
1609 | ||
8cd2e972 | 1610 | int udev_device_set_syspath(struct udev_device *udev_device, const char *syspath) |
11d543c1 | 1611 | { |
912541b0 KS |
1612 | const char *pos; |
1613 | size_t len; | |
8753fadf | 1614 | |
912541b0 KS |
1615 | free(udev_device->syspath); |
1616 | udev_device->syspath = strdup(syspath); | |
1617 | if (udev_device->syspath == NULL) | |
1618 | return -ENOMEM; | |
4cb72937 | 1619 | udev_device->devpath = udev_device->syspath + strlen("/sys"); |
912541b0 | 1620 | udev_device_add_property(udev_device, "DEVPATH", udev_device->devpath); |
517814e7 | 1621 | |
912541b0 KS |
1622 | pos = strrchr(udev_device->syspath, '/'); |
1623 | if (pos == NULL) | |
1624 | return -EINVAL; | |
1625 | udev_device->sysname = strdup(&pos[1]); | |
1626 | if (udev_device->sysname == NULL) | |
1627 | return -ENOMEM; | |
517814e7 | 1628 | |
912541b0 KS |
1629 | /* some devices have '!' in their name, change that to '/' */ |
1630 | len = 0; | |
1631 | while (udev_device->sysname[len] != '\0') { | |
1632 | if (udev_device->sysname[len] == '!') | |
1633 | udev_device->sysname[len] = '/'; | |
1634 | len++; | |
1635 | } | |
517814e7 | 1636 | |
912541b0 KS |
1637 | /* trailing number */ |
1638 | while (len > 0 && isdigit(udev_device->sysname[--len])) | |
1639 | udev_device->sysnum = &udev_device->sysname[len]; | |
babcf3cb | 1640 | |
912541b0 KS |
1641 | /* sysname is completely numeric */ |
1642 | if (len == 0) | |
1643 | udev_device->sysnum = NULL; | |
babcf3cb | 1644 | |
912541b0 | 1645 | return 0; |
11d543c1 KS |
1646 | } |
1647 | ||
b2661839 | 1648 | static int udev_device_set_devnode(struct udev_device *udev_device, const char *devnode) |
11d543c1 | 1649 | { |
912541b0 KS |
1650 | free(udev_device->devnode); |
1651 | if (devnode[0] != '/') { | |
4cb72937 | 1652 | if (asprintf(&udev_device->devnode, "/dev/%s", devnode) < 0) |
912541b0 KS |
1653 | udev_device->devnode = NULL; |
1654 | } else { | |
1655 | udev_device->devnode = strdup(devnode); | |
1656 | } | |
1657 | if (udev_device->devnode == NULL) | |
1658 | return -ENOMEM; | |
1659 | udev_device_add_property(udev_device, "DEVNAME", udev_device->devnode); | |
1660 | return 0; | |
11d543c1 KS |
1661 | } |
1662 | ||
8a173387 | 1663 | int udev_device_add_devlink(struct udev_device *udev_device, const char *devlink) |
11d543c1 | 1664 | { |
912541b0 | 1665 | struct udev_list_entry *list_entry; |
6c29f2b9 | 1666 | |
912541b0 KS |
1667 | udev_device->devlinks_uptodate = false; |
1668 | list_entry = udev_list_entry_add(&udev_device->devlinks_list, devlink, NULL); | |
1669 | if (list_entry == NULL) | |
1670 | return -ENOMEM; | |
912541b0 | 1671 | return 0; |
11d543c1 KS |
1672 | } |
1673 | ||
4281da1f KS |
1674 | const char *udev_device_get_id_filename(struct udev_device *udev_device) |
1675 | { | |
912541b0 KS |
1676 | if (udev_device->id_filename == NULL) { |
1677 | if (udev_device_get_subsystem(udev_device) == NULL) | |
1678 | return NULL; | |
1679 | ||
1680 | if (major(udev_device_get_devnum(udev_device)) > 0) { | |
1681 | /* use dev_t -- b259:131072, c254:0 */ | |
1682 | if (asprintf(&udev_device->id_filename, "%c%u:%u", | |
33502ffe | 1683 | streq(udev_device_get_subsystem(udev_device), "block") ? 'b' : 'c', |
912541b0 KS |
1684 | major(udev_device_get_devnum(udev_device)), |
1685 | minor(udev_device_get_devnum(udev_device))) < 0) | |
1686 | udev_device->id_filename = NULL; | |
1687 | } else if (udev_device_get_ifindex(udev_device) > 0) { | |
1688 | /* use netdev ifindex -- n3 */ | |
1fa2f38f | 1689 | if (asprintf(&udev_device->id_filename, "n%i", udev_device_get_ifindex(udev_device)) < 0) |
912541b0 KS |
1690 | udev_device->id_filename = NULL; |
1691 | } else { | |
1692 | /* | |
1693 | * use $subsys:$syname -- pci:0000:00:1f.2 | |
1694 | * sysname() has '!' translated, get it from devpath | |
1695 | */ | |
1696 | const char *sysname; | |
1697 | sysname = strrchr(udev_device->devpath, '/'); | |
1698 | if (sysname == NULL) | |
1699 | return NULL; | |
1700 | sysname = &sysname[1]; | |
1701 | if (asprintf(&udev_device->id_filename, "+%s:%s", udev_device_get_subsystem(udev_device), sysname) < 0) | |
1702 | udev_device->id_filename = NULL; | |
1703 | } | |
1704 | } | |
1705 | return udev_device->id_filename; | |
4281da1f KS |
1706 | } |
1707 | ||
48a0170b KS |
1708 | /** |
1709 | * udev_device_get_is_initialized: | |
1710 | * @udev_device: udev device | |
1711 | * | |
1712 | * Check if udev has already handled the device and has set up | |
1713 | * device node permissions and context, or has renamed a network | |
1714 | * device. | |
1715 | * | |
9c6a11b1 | 1716 | * This is only implemented for devices with a device node |
48a0170b KS |
1717 | * or network interfaces. All other devices return 1 here. |
1718 | * | |
1719 | * Returns: 1 if the device is set up. 0 otherwise. | |
1720 | **/ | |
54cf0b7f | 1721 | _public_ int udev_device_get_is_initialized(struct udev_device *udev_device) |
48a0170b | 1722 | { |
912541b0 KS |
1723 | if (!udev_device->info_loaded) |
1724 | udev_device_read_db(udev_device, NULL); | |
1725 | return udev_device->is_initialized; | |
48a0170b KS |
1726 | } |
1727 | ||
1728 | void udev_device_set_is_initialized(struct udev_device *udev_device) | |
1729 | { | |
912541b0 | 1730 | udev_device->is_initialized = true; |
48a0170b KS |
1731 | } |
1732 | ||
8e3ba377 DH |
1733 | static bool is_valid_tag(const char *tag) |
1734 | { | |
1735 | return !strchr(tag, ':') && !strchr(tag, ' '); | |
1736 | } | |
1737 | ||
28460195 KS |
1738 | int udev_device_add_tag(struct udev_device *udev_device, const char *tag) |
1739 | { | |
8e3ba377 | 1740 | if (!is_valid_tag(tag)) |
912541b0 KS |
1741 | return -EINVAL; |
1742 | udev_device->tags_uptodate = false; | |
1743 | if (udev_list_entry_add(&udev_device->tags_list, tag, NULL) != NULL) | |
1744 | return 0; | |
1745 | return -ENOMEM; | |
28460195 KS |
1746 | } |
1747 | ||
8e3ba377 DH |
1748 | void udev_device_remove_tag(struct udev_device *udev_device, const char *tag) |
1749 | { | |
1750 | struct udev_list_entry *e; | |
1751 | ||
1752 | if (!is_valid_tag(tag)) | |
1753 | return; | |
1754 | e = udev_list_get_entry(&udev_device->tags_list); | |
1755 | e = udev_list_entry_get_by_name(e, tag); | |
1756 | if (e) { | |
1757 | udev_device->tags_uptodate = false; | |
1758 | udev_list_entry_delete(e); | |
1759 | } | |
1760 | } | |
1761 | ||
28460195 KS |
1762 | void udev_device_cleanup_tags_list(struct udev_device *udev_device) |
1763 | { | |
912541b0 KS |
1764 | udev_device->tags_uptodate = false; |
1765 | udev_list_cleanup(&udev_device->tags_list); | |
28460195 KS |
1766 | } |
1767 | ||
f712894d KS |
1768 | /** |
1769 | * udev_device_get_tags_list_entry: | |
1770 | * @udev_device: udev device | |
1771 | * | |
1772 | * Retrieve the list of tags attached to the udev device. The next | |
bb061708 | 1773 | * list entry can be retrieved with udev_list_entry_get_next(), |
f712894d | 1774 | * which returns #NULL if no more entries exist. The tag string |
bb061708 | 1775 | * can be retrieved from the list entry by udev_list_entry_get_name(). |
f712894d KS |
1776 | * |
1777 | * Returns: the first entry of the tag list | |
1778 | **/ | |
54cf0b7f | 1779 | _public_ struct udev_list_entry *udev_device_get_tags_list_entry(struct udev_device *udev_device) |
28460195 | 1780 | { |
912541b0 KS |
1781 | if (udev_device == NULL) |
1782 | return NULL; | |
1783 | if (!udev_device->info_loaded) | |
1784 | udev_device_read_db(udev_device, NULL); | |
1785 | return udev_list_get_entry(&udev_device->tags_list); | |
28460195 KS |
1786 | } |
1787 | ||
21dbe43a KS |
1788 | /** |
1789 | * udev_device_has_tag: | |
1790 | * @udev_device: udev device | |
1791 | * @tag: tag name | |
1792 | * | |
1793 | * Check if a given device has a certain tag associated. | |
1794 | * | |
1795 | * Returns: 1 if the tag is found. 0 otherwise. | |
1796 | **/ | |
54cf0b7f | 1797 | _public_ int udev_device_has_tag(struct udev_device *udev_device, const char *tag) |
28460195 | 1798 | { |
912541b0 | 1799 | struct udev_list_entry *list_entry; |
28460195 | 1800 | |
912541b0 KS |
1801 | if (udev_device == NULL) |
1802 | return false; | |
1803 | if (!udev_device->info_loaded) | |
1804 | udev_device_read_db(udev_device, NULL); | |
1805 | list_entry = udev_device_get_tags_list_entry(udev_device); | |
1806 | if (udev_list_entry_get_by_name(list_entry, tag) != NULL) | |
1807 | return true; | |
1808 | return false; | |
28460195 KS |
1809 | } |
1810 | ||
912541b0 KS |
1811 | #define ENVP_SIZE 128 |
1812 | #define MONITOR_BUF_SIZE 4096 | |
6493e655 | 1813 | static int update_envp_monitor_buf(struct udev_device *udev_device) |
979ff016 | 1814 | { |
912541b0 KS |
1815 | struct udev_list_entry *list_entry; |
1816 | char *s; | |
1817 | size_t l; | |
1818 | unsigned int i; | |
1819 | ||
1820 | /* monitor buffer of property strings */ | |
1821 | free(udev_device->monitor_buf); | |
1822 | udev_device->monitor_buf_len = 0; | |
1823 | udev_device->monitor_buf = malloc(MONITOR_BUF_SIZE); | |
1824 | if (udev_device->monitor_buf == NULL) | |
1825 | return -ENOMEM; | |
1826 | ||
1827 | /* envp array, strings will point into monitor buffer */ | |
1828 | if (udev_device->envp == NULL) | |
1829 | udev_device->envp = malloc(sizeof(char *) * ENVP_SIZE); | |
1830 | if (udev_device->envp == NULL) | |
1831 | return -ENOMEM; | |
1832 | ||
1833 | i = 0; | |
1834 | s = udev_device->monitor_buf; | |
1835 | l = MONITOR_BUF_SIZE; | |
1836 | udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device)) { | |
1837 | const char *key; | |
1838 | ||
1839 | key = udev_list_entry_get_name(list_entry); | |
1840 | /* skip private variables */ | |
1841 | if (key[0] == '.') | |
1842 | continue; | |
1843 | ||
1844 | /* add string to envp array */ | |
1845 | udev_device->envp[i++] = s; | |
1846 | if (i+1 >= ENVP_SIZE) | |
1847 | return -EINVAL; | |
1848 | ||
1849 | /* add property string to monitor buffer */ | |
d5a89d7d | 1850 | l = strpcpyl(&s, l, key, "=", udev_list_entry_get_value(list_entry), NULL); |
912541b0 KS |
1851 | if (l == 0) |
1852 | return -EINVAL; | |
d5a89d7d | 1853 | /* advance past the trailing '\0' that strpcpyl() guarantees */ |
912541b0 KS |
1854 | s++; |
1855 | l--; | |
1856 | } | |
1857 | udev_device->envp[i] = NULL; | |
1858 | udev_device->monitor_buf_len = s - udev_device->monitor_buf; | |
1859 | udev_device->envp_uptodate = true; | |
912541b0 | 1860 | return 0; |
6493e655 KS |
1861 | } |
1862 | ||
1863 | char **udev_device_get_properties_envp(struct udev_device *udev_device) | |
1864 | { | |
912541b0 KS |
1865 | if (!udev_device->envp_uptodate) |
1866 | if (update_envp_monitor_buf(udev_device) != 0) | |
1867 | return NULL; | |
1868 | return udev_device->envp; | |
6493e655 KS |
1869 | } |
1870 | ||
1871 | ssize_t udev_device_get_properties_monitor_buf(struct udev_device *udev_device, const char **buf) | |
1872 | { | |
912541b0 KS |
1873 | if (!udev_device->envp_uptodate) |
1874 | if (update_envp_monitor_buf(udev_device) != 0) | |
1875 | return -EINVAL; | |
1876 | *buf = udev_device->monitor_buf; | |
1877 | return udev_device->monitor_buf_len; | |
c2654402 KS |
1878 | } |
1879 | ||
8cd2e972 | 1880 | int udev_device_set_action(struct udev_device *udev_device, const char *action) |
c4f5f942 | 1881 | { |
912541b0 KS |
1882 | free(udev_device->action); |
1883 | udev_device->action = strdup(action); | |
1884 | if (udev_device->action == NULL) | |
1885 | return -ENOMEM; | |
1886 | udev_device_add_property(udev_device, "ACTION", udev_device->action); | |
1887 | return 0; | |
c4f5f942 KS |
1888 | } |
1889 | ||
8cd2e972 | 1890 | int udev_device_get_devlink_priority(struct udev_device *udev_device) |
6bd1c78a | 1891 | { |
912541b0 KS |
1892 | if (!udev_device->info_loaded) |
1893 | udev_device_read_db(udev_device, NULL); | |
1894 | return udev_device->devlink_priority; | |
6bd1c78a KS |
1895 | } |
1896 | ||
8cd2e972 | 1897 | int udev_device_set_devlink_priority(struct udev_device *udev_device, int prio) |
6bd1c78a | 1898 | { |
912541b0 KS |
1899 | udev_device->devlink_priority = prio; |
1900 | return 0; | |
6bd1c78a KS |
1901 | } |
1902 | ||
d7ce7539 SJR |
1903 | int udev_device_get_watch_handle(struct udev_device *udev_device) |
1904 | { | |
912541b0 KS |
1905 | if (!udev_device->info_loaded) |
1906 | udev_device_read_db(udev_device, NULL); | |
1907 | return udev_device->watch_handle; | |
d7ce7539 SJR |
1908 | } |
1909 | ||
1910 | int udev_device_set_watch_handle(struct udev_device *udev_device, int handle) | |
1911 | { | |
912541b0 KS |
1912 | udev_device->watch_handle = handle; |
1913 | return 0; | |
d7ce7539 | 1914 | } |
fc416258 | 1915 | |
9ead6627 KS |
1916 | bool udev_device_get_db_persist(struct udev_device *udev_device) |
1917 | { | |
912541b0 | 1918 | return udev_device->db_persist; |
9ead6627 KS |
1919 | } |
1920 | ||
1921 | void udev_device_set_db_persist(struct udev_device *udev_device) | |
1922 | { | |
912541b0 | 1923 | udev_device->db_persist = true; |
9ead6627 | 1924 | } |
243d1825 TG |
1925 | |
1926 | int udev_device_rename(struct udev_device *udev_device, const char *name) | |
1927 | { | |
1928 | _cleanup_free_ char *dirname = NULL; | |
1929 | char *new_syspath; | |
1930 | int r; | |
1931 | ||
1932 | if (udev_device == NULL || name == NULL) | |
1933 | return -EINVAL; | |
1934 | ||
1935 | dirname = dirname_malloc(udev_device->syspath); | |
1936 | if (!dirname) | |
1937 | return -ENOMEM; | |
1938 | ||
1939 | new_syspath = strappenda(dirname, "/", name); | |
1940 | ||
1941 | r = udev_device_set_syspath(udev_device, new_syspath); | |
1942 | if (r < 0) | |
1943 | return r; | |
1944 | ||
1945 | return 0; | |
1946 | } |