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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 KS |
141 | udev_device->ifindex = ifindex; |
142 | snprintf(num, sizeof(num), "%u", ifindex); | |
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 | ||
164 | static int udev_device_set_devnum(struct udev_device *udev_device, dev_t devnum) | |
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"); | |
537 | if (f == NULL) { | |
c8f8394a | 538 | udev_dbg(udev_device->udev, "no db file to read %s: %m\n", dbfile); |
994e0234 | 539 | return -errno; |
912541b0 | 540 | } |
f6613dd9 KS |
541 | |
542 | /* devices with a database entry are initialized */ | |
912541b0 KS |
543 | udev_device->is_initialized = true; |
544 | ||
545 | while (fgets(line, sizeof(line), f)) { | |
546 | ssize_t len; | |
547 | const char *val; | |
548 | struct udev_list_entry *entry; | |
549 | ||
550 | len = strlen(line); | |
551 | if (len < 4) | |
552 | break; | |
553 | line[len-1] = '\0'; | |
554 | val = &line[2]; | |
555 | switch(line[0]) { | |
556 | case 'S': | |
d5a89d7d | 557 | strscpyl(filename, sizeof(filename), "/dev/", val, NULL); |
8a173387 | 558 | udev_device_add_devlink(udev_device, filename); |
912541b0 KS |
559 | break; |
560 | case 'L': | |
561 | udev_device_set_devlink_priority(udev_device, atoi(val)); | |
562 | break; | |
563 | case 'E': | |
564 | entry = udev_device_add_property_from_string(udev_device, val); | |
565 | udev_list_entry_set_num(entry, true); | |
566 | break; | |
567 | case 'G': | |
568 | udev_device_add_tag(udev_device, val); | |
569 | break; | |
570 | case 'W': | |
571 | udev_device_set_watch_handle(udev_device, atoi(val)); | |
572 | break; | |
573 | case 'I': | |
574 | udev_device_set_usec_initialized(udev_device, strtoull(val, NULL, 10)); | |
575 | break; | |
576 | } | |
577 | } | |
578 | fclose(f); | |
579 | ||
c8f8394a | 580 | udev_dbg(udev_device->udev, "device %p filled with db file data\n", udev_device); |
912541b0 | 581 | return 0; |
e88a82b5 KS |
582 | } |
583 | ||
bd85566c | 584 | int udev_device_read_uevent_file(struct udev_device *udev_device) |
99214844 | 585 | { |
912541b0 KS |
586 | char filename[UTIL_PATH_SIZE]; |
587 | FILE *f; | |
588 | char line[UTIL_LINE_SIZE]; | |
589 | int maj = 0; | |
590 | int min = 0; | |
591 | ||
592 | if (udev_device->uevent_loaded) | |
593 | return 0; | |
594 | ||
d5a89d7d | 595 | strscpyl(filename, sizeof(filename), udev_device->syspath, "/uevent", NULL); |
912541b0 KS |
596 | f = fopen(filename, "re"); |
597 | if (f == NULL) | |
994e0234 | 598 | return -errno; |
912541b0 KS |
599 | udev_device->uevent_loaded = true; |
600 | ||
601 | while (fgets(line, sizeof(line), f)) { | |
602 | char *pos; | |
603 | ||
604 | pos = strchr(line, '\n'); | |
605 | if (pos == NULL) | |
606 | continue; | |
607 | pos[0] = '\0'; | |
608 | ||
33502ffe | 609 | if (startswith(line, "DEVTYPE=")) { |
912541b0 | 610 | udev_device_set_devtype(udev_device, &line[8]); |
d2b795f2 KS |
611 | continue; |
612 | } | |
33502ffe | 613 | if (startswith(line, "IFINDEX=")) { |
d2b795f2 KS |
614 | udev_device_set_ifindex(udev_device, strtoull(&line[8], NULL, 10)); |
615 | continue; | |
616 | } | |
33502ffe | 617 | if (startswith(line, "DEVNAME=")) { |
d2b795f2 KS |
618 | udev_device_set_devnode(udev_device, &line[8]); |
619 | continue; | |
620 | } | |
621 | ||
33502ffe | 622 | if (startswith(line, "MAJOR=")) |
912541b0 | 623 | maj = strtoull(&line[6], NULL, 10); |
33502ffe | 624 | else if (startswith(line, "MINOR=")) |
912541b0 | 625 | min = strtoull(&line[6], NULL, 10); |
33502ffe | 626 | else if (startswith(line, "DEVMODE=")) |
912541b0 KS |
627 | udev_device->devnode_mode = strtoul(&line[8], NULL, 8); |
628 | ||
629 | udev_device_add_property_from_string(udev_device, line); | |
630 | } | |
631 | ||
632 | udev_device->devnum = makedev(maj, min); | |
633 | fclose(f); | |
634 | return 0; | |
99214844 KS |
635 | } |
636 | ||
8cd2e972 | 637 | void udev_device_set_info_loaded(struct udev_device *device) |
99214844 | 638 | { |
912541b0 | 639 | device->info_loaded = true; |
99214844 KS |
640 | } |
641 | ||
a5710160 | 642 | struct udev_device *udev_device_new(struct udev *udev) |
eb1f0e66 | 643 | { |
912541b0 KS |
644 | struct udev_device *udev_device; |
645 | struct udev_list_entry *list_entry; | |
646 | ||
647 | if (udev == NULL) | |
648 | return NULL; | |
649 | ||
955d98c9 | 650 | udev_device = new0(struct udev_device, 1); |
912541b0 KS |
651 | if (udev_device == NULL) |
652 | return NULL; | |
653 | udev_device->refcount = 1; | |
654 | udev_device->udev = udev; | |
655 | udev_list_init(udev, &udev_device->devlinks_list, true); | |
656 | udev_list_init(udev, &udev_device->properties_list, true); | |
657 | udev_list_init(udev, &udev_device->sysattr_value_list, true); | |
658 | udev_list_init(udev, &udev_device->sysattr_list, false); | |
659 | udev_list_init(udev, &udev_device->tags_list, true); | |
660 | udev_device->watch_handle = -1; | |
661 | /* copy global properties */ | |
662 | udev_list_entry_foreach(list_entry, udev_get_properties_list_entry(udev)) | |
663 | udev_device_add_property(udev_device, | |
664 | udev_list_entry_get_name(list_entry), | |
665 | udev_list_entry_get_value(list_entry)); | |
912541b0 | 666 | return udev_device; |
eb1f0e66 KS |
667 | } |
668 | ||
669 | /** | |
8753fadf | 670 | * udev_device_new_from_syspath: |
eb1f0e66 | 671 | * @udev: udev library context |
8753fadf | 672 | * @syspath: sys device path including sys directory |
eb1f0e66 | 673 | * |
8753fadf | 674 | * Create new udev device, and fill in information from the sys |
214a6c79 | 675 | * device and the udev database entry. The syspath is the absolute |
8753fadf | 676 | * path to the device, including the sys mount point. |
eb1f0e66 KS |
677 | * |
678 | * The initial refcount is 1, and needs to be decremented to | |
be7de409 | 679 | * release the resources of the udev device. |
eb1f0e66 KS |
680 | * |
681 | * Returns: a new udev device, or #NULL, if it does not exist | |
682 | **/ | |
54cf0b7f | 683 | _public_ struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *syspath) |
eb1f0e66 | 684 | { |
912541b0 KS |
685 | const char *subdir; |
686 | char path[UTIL_PATH_SIZE]; | |
687 | char *pos; | |
688 | struct stat statbuf; | |
689 | struct udev_device *udev_device; | |
690 | ||
691 | if (udev == NULL) | |
692 | return NULL; | |
693 | if (syspath == NULL) | |
694 | return NULL; | |
695 | ||
696 | /* path starts in sys */ | |
4cb72937 | 697 | if (!startswith(syspath, "/sys")) { |
c8f8394a | 698 | udev_dbg(udev, "not in sys :%s\n", syspath); |
912541b0 KS |
699 | return NULL; |
700 | } | |
701 | ||
702 | /* path is not a root directory */ | |
4cb72937 | 703 | subdir = syspath + strlen("/sys"); |
912541b0 | 704 | pos = strrchr(subdir, '/'); |
baa30fbc | 705 | if (pos == NULL || pos[1] == '\0' || pos < &subdir[2]) |
912541b0 | 706 | return NULL; |
912541b0 KS |
707 | |
708 | /* resolve possible symlink to real path */ | |
d5a89d7d | 709 | strscpy(path, sizeof(path), syspath); |
912541b0 KS |
710 | util_resolve_sys_link(udev, path, sizeof(path)); |
711 | ||
4cb72937 | 712 | if (startswith(path + strlen("/sys"), "/devices/")) { |
912541b0 KS |
713 | char file[UTIL_PATH_SIZE]; |
714 | ||
715 | /* all "devices" require a "uevent" file */ | |
d5a89d7d | 716 | strscpyl(file, sizeof(file), path, "/uevent", NULL); |
baa30fbc | 717 | if (stat(file, &statbuf) != 0) |
912541b0 | 718 | return NULL; |
912541b0 KS |
719 | } else { |
720 | /* everything else just needs to be a directory */ | |
baa30fbc | 721 | if (stat(path, &statbuf) != 0 || !S_ISDIR(statbuf.st_mode)) |
912541b0 | 722 | return NULL; |
912541b0 KS |
723 | } |
724 | ||
725 | udev_device = udev_device_new(udev); | |
726 | if (udev_device == NULL) | |
727 | return NULL; | |
728 | ||
729 | udev_device_set_syspath(udev_device, path); | |
c8f8394a | 730 | udev_dbg(udev, "device %p has devpath '%s'\n", udev_device, udev_device_get_devpath(udev_device)); |
912541b0 KS |
731 | |
732 | return udev_device; | |
eb1f0e66 KS |
733 | } |
734 | ||
1e511322 KS |
735 | /** |
736 | * udev_device_new_from_devnum: | |
737 | * @udev: udev library context | |
738 | * @type: char or block device | |
739 | * @devnum: device major/minor number | |
740 | * | |
741 | * Create new udev device, and fill in information from the sys | |
dbba7e40 KS |
742 | * device and the udev database entry. The device is looked-up |
743 | * by its major/minor number and type. Character and block device | |
744 | * numbers are not unique across the two types. | |
1e511322 KS |
745 | * |
746 | * The initial refcount is 1, and needs to be decremented to | |
747 | * release the resources of the udev device. | |
748 | * | |
749 | * Returns: a new udev device, or #NULL, if it does not exist | |
750 | **/ | |
54cf0b7f | 751 | _public_ struct udev_device *udev_device_new_from_devnum(struct udev *udev, char type, dev_t devnum) |
4c9dff47 | 752 | { |
912541b0 KS |
753 | char path[UTIL_PATH_SIZE]; |
754 | const char *type_str; | |
03198b93 | 755 | |
912541b0 KS |
756 | if (type == 'b') |
757 | type_str = "block"; | |
758 | else if (type == 'c') | |
759 | type_str = "char"; | |
760 | else | |
761 | return NULL; | |
4c9dff47 | 762 | |
912541b0 | 763 | /* use /sys/dev/{block,char}/<maj>:<min> link */ |
4cb72937 | 764 | snprintf(path, sizeof(path), "/sys/dev/%s/%u:%u", |
6ada823a | 765 | type_str, major(devnum), minor(devnum)); |
912541b0 | 766 | return udev_device_new_from_syspath(udev, path); |
4c9dff47 KS |
767 | } |
768 | ||
dbf61afb KS |
769 | /** |
770 | * udev_device_new_from_device_id: | |
771 | * @udev: udev library context | |
772 | * @id: text string identifying a kernel device | |
773 | * | |
774 | * Create new udev device, and fill in information from the sys | |
775 | * device and the udev database entry. The device is looked-up | |
776 | * by a special string: | |
777 | * b8:2 - block device major:minor | |
778 | * c128:1 - char device major:minor | |
779 | * n3 - network device ifindex | |
780 | * +sound:card29 - kernel driver core subsystem:device name | |
781 | * | |
782 | * The initial refcount is 1, and needs to be decremented to | |
783 | * release the resources of the udev device. | |
784 | * | |
785 | * Returns: a new udev device, or #NULL, if it does not exist | |
786 | **/ | |
67410e9f | 787 | _public_ struct udev_device *udev_device_new_from_device_id(struct udev *udev, const char *id) |
cad40a5f | 788 | { |
912541b0 KS |
789 | char type; |
790 | int maj, min; | |
791 | char subsys[UTIL_PATH_SIZE]; | |
792 | char *sysname; | |
793 | ||
794 | switch(id[0]) { | |
795 | case 'b': | |
796 | case 'c': | |
797 | if (sscanf(id, "%c%i:%i", &type, &maj, &min) != 3) | |
798 | return NULL; | |
799 | return udev_device_new_from_devnum(udev, type, makedev(maj, min)); | |
800 | case 'n': { | |
801 | int sk; | |
802 | struct ifreq ifr; | |
803 | struct udev_device *dev; | |
804 | int ifindex; | |
805 | ||
806 | ifindex = strtoul(&id[1], NULL, 10); | |
807 | if (ifindex <= 0) | |
808 | return NULL; | |
809 | ||
810 | sk = socket(PF_INET, SOCK_DGRAM, 0); | |
811 | if (sk < 0) | |
812 | return NULL; | |
29804cc1 | 813 | memzero(&ifr, sizeof(struct ifreq)); |
912541b0 KS |
814 | ifr.ifr_ifindex = ifindex; |
815 | if (ioctl(sk, SIOCGIFNAME, &ifr) != 0) { | |
816 | close(sk); | |
817 | return NULL; | |
818 | } | |
819 | close(sk); | |
820 | ||
821 | dev = udev_device_new_from_subsystem_sysname(udev, "net", ifr.ifr_name); | |
822 | if (dev == NULL) | |
823 | return NULL; | |
824 | if (udev_device_get_ifindex(dev) == ifindex) | |
825 | return dev; | |
826 | udev_device_unref(dev); | |
827 | return NULL; | |
828 | } | |
829 | case '+': | |
d5a89d7d | 830 | strscpy(subsys, sizeof(subsys), &id[1]); |
912541b0 KS |
831 | sysname = strchr(subsys, ':'); |
832 | if (sysname == NULL) | |
833 | return NULL; | |
834 | sysname[0] = '\0'; | |
835 | sysname = &sysname[1]; | |
836 | return udev_device_new_from_subsystem_sysname(udev, subsys, sysname); | |
837 | default: | |
838 | return NULL; | |
839 | } | |
cad40a5f KS |
840 | } |
841 | ||
1e511322 KS |
842 | /** |
843 | * udev_device_new_from_subsystem_sysname: | |
844 | * @udev: udev library context | |
214a6c79 | 845 | * @subsystem: the subsystem of the device |
1e511322 KS |
846 | * @sysname: the name of the device |
847 | * | |
dbba7e40 KS |
848 | * Create new udev device, and fill in information from the sys device |
849 | * and the udev database entry. The device is looked up by the subsystem | |
850 | * and name string of the device, like "mem" / "zero", or "block" / "sda". | |
1e511322 KS |
851 | * |
852 | * The initial refcount is 1, and needs to be decremented to | |
853 | * release the resources of the udev device. | |
854 | * | |
855 | * Returns: a new udev device, or #NULL, if it does not exist | |
856 | **/ | |
54cf0b7f | 857 | _public_ struct udev_device *udev_device_new_from_subsystem_sysname(struct udev *udev, const char *subsystem, const char *sysname) |
90d80c2e | 858 | { |
6ada823a | 859 | char path[UTIL_PATH_SIZE]; |
912541b0 KS |
860 | struct stat statbuf; |
861 | ||
33502ffe | 862 | if (streq(subsystem, "subsystem")) { |
d5a89d7d | 863 | strscpyl(path, sizeof(path), "/sys/subsystem/", sysname, NULL); |
6ada823a | 864 | if (stat(path, &statbuf) == 0) |
912541b0 KS |
865 | goto found; |
866 | ||
d5a89d7d | 867 | strscpyl(path, sizeof(path), "/sys/bus/", sysname, NULL); |
6ada823a | 868 | if (stat(path, &statbuf) == 0) |
912541b0 KS |
869 | goto found; |
870 | ||
d5a89d7d | 871 | strscpyl(path, sizeof(path), "/sys/class/", sysname, NULL); |
6ada823a | 872 | if (stat(path, &statbuf) == 0) |
912541b0 KS |
873 | goto found; |
874 | goto out; | |
875 | } | |
876 | ||
33502ffe | 877 | if (streq(subsystem, "module")) { |
d5a89d7d | 878 | strscpyl(path, sizeof(path), "/sys/module/", sysname, NULL); |
6ada823a | 879 | if (stat(path, &statbuf) == 0) |
912541b0 KS |
880 | goto found; |
881 | goto out; | |
882 | } | |
883 | ||
33502ffe | 884 | if (streq(subsystem, "drivers")) { |
912541b0 KS |
885 | char subsys[UTIL_NAME_SIZE]; |
886 | char *driver; | |
887 | ||
d5a89d7d | 888 | strscpy(subsys, sizeof(subsys), sysname); |
912541b0 KS |
889 | driver = strchr(subsys, ':'); |
890 | if (driver != NULL) { | |
891 | driver[0] = '\0'; | |
892 | driver = &driver[1]; | |
893 | ||
d5a89d7d | 894 | strscpyl(path, sizeof(path), "/sys/subsystem/", subsys, "/drivers/", driver, NULL); |
6ada823a | 895 | if (stat(path, &statbuf) == 0) |
912541b0 KS |
896 | goto found; |
897 | ||
d5a89d7d | 898 | strscpyl(path, sizeof(path), "/sys/bus/", subsys, "/drivers/", driver, NULL); |
6ada823a | 899 | if (stat(path, &statbuf) == 0) |
912541b0 KS |
900 | goto found; |
901 | } | |
902 | goto out; | |
903 | } | |
904 | ||
d5a89d7d | 905 | strscpyl(path, sizeof(path), "/sys/subsystem/", subsystem, "/devices/", sysname, NULL); |
6ada823a | 906 | if (stat(path, &statbuf) == 0) |
912541b0 KS |
907 | goto found; |
908 | ||
d5a89d7d | 909 | strscpyl(path, sizeof(path), "/sys/bus/", subsystem, "/devices/", sysname, NULL); |
6ada823a | 910 | if (stat(path, &statbuf) == 0) |
912541b0 KS |
911 | goto found; |
912 | ||
d5a89d7d | 913 | strscpyl(path, sizeof(path), "/sys/class/", subsystem, "/", sysname, NULL); |
6ada823a | 914 | if (stat(path, &statbuf) == 0) |
912541b0 | 915 | goto found; |
90d80c2e | 916 | out: |
912541b0 | 917 | return NULL; |
90d80c2e | 918 | found: |
6ada823a | 919 | return udev_device_new_from_syspath(udev, path); |
90d80c2e KS |
920 | } |
921 | ||
fc8d61c5 KS |
922 | /** |
923 | * udev_device_new_from_environment | |
924 | * @udev: udev library context | |
925 | * | |
926 | * Create new udev device, and fill in information from the | |
927 | * current process environment. This only works reliable if | |
928 | * the process is called from a udev rule. It is usually used | |
929 | * for tools executed from IMPORT= rules. | |
930 | * | |
931 | * The initial refcount is 1, and needs to be decremented to | |
932 | * release the resources of the udev device. | |
933 | * | |
934 | * Returns: a new udev device, or #NULL, if it does not exist | |
935 | **/ | |
54cf0b7f | 936 | _public_ struct udev_device *udev_device_new_from_environment(struct udev *udev) |
fc8d61c5 | 937 | { |
912541b0 KS |
938 | int i; |
939 | struct udev_device *udev_device; | |
fc8d61c5 | 940 | |
912541b0 KS |
941 | udev_device = udev_device_new(udev); |
942 | if (udev_device == NULL) | |
943 | return NULL; | |
944 | udev_device_set_info_loaded(udev_device); | |
fc8d61c5 | 945 | |
912541b0 KS |
946 | for (i = 0; environ[i] != NULL; i++) |
947 | udev_device_add_property_from_string_parse(udev_device, environ[i]); | |
fc8d61c5 | 948 | |
912541b0 | 949 | if (udev_device_add_property_from_string_parse_finish(udev_device) < 0) { |
c8f8394a | 950 | udev_dbg(udev, "missing values, invalid device\n"); |
912541b0 KS |
951 | udev_device_unref(udev_device); |
952 | udev_device = NULL; | |
953 | } | |
fc8d61c5 | 954 | |
912541b0 | 955 | return udev_device; |
fc8d61c5 KS |
956 | } |
957 | ||
b2d9e4f2 | 958 | static struct udev_device *device_new_from_parent(struct udev_device *udev_device) |
4ad3a37f | 959 | { |
912541b0 KS |
960 | struct udev_device *udev_device_parent = NULL; |
961 | char path[UTIL_PATH_SIZE]; | |
962 | const char *subdir; | |
4ad3a37f | 963 | |
d5a89d7d | 964 | strscpy(path, sizeof(path), udev_device->syspath); |
4cb72937 | 965 | subdir = path + strlen("/sys/"); |
912541b0 KS |
966 | for (;;) { |
967 | char *pos; | |
b95f8a76 | 968 | |
912541b0 KS |
969 | pos = strrchr(subdir, '/'); |
970 | if (pos == NULL || pos < &subdir[2]) | |
971 | break; | |
972 | pos[0] = '\0'; | |
973 | udev_device_parent = udev_device_new_from_syspath(udev_device->udev, path); | |
974 | if (udev_device_parent != NULL) | |
975 | return udev_device_parent; | |
976 | } | |
977 | return NULL; | |
4ad3a37f KS |
978 | } |
979 | ||
1e511322 KS |
980 | /** |
981 | * udev_device_get_parent: | |
982 | * @udev_device: the device to start searching from | |
983 | * | |
984 | * Find the next parent device, and fill in information from the sys | |
985 | * device and the udev database entry. | |
986 | * | |
572ce4f7 ZJS |
987 | * Returned device is not referenced. It is attached to the child |
988 | * device, and will be cleaned up when the child device is cleaned up. | |
1e511322 | 989 | * |
214a6c79 | 990 | * It is not necessarily just the upper level directory, empty or not |
1e511322 KS |
991 | * recognized sys directories are ignored. |
992 | * | |
993 | * It can be called as many times as needed, without caring about | |
994 | * references. | |
995 | * | |
996 | * Returns: a new udev device, or #NULL, if it no parent exist. | |
997 | **/ | |
54cf0b7f | 998 | _public_ struct udev_device *udev_device_get_parent(struct udev_device *udev_device) |
b2d9e4f2 | 999 | { |
912541b0 KS |
1000 | if (udev_device == NULL) |
1001 | return NULL; | |
1002 | if (!udev_device->parent_set) { | |
1003 | udev_device->parent_set = true; | |
1004 | udev_device->parent_device = device_new_from_parent(udev_device); | |
1005 | } | |
912541b0 | 1006 | return udev_device->parent_device; |
b2d9e4f2 KS |
1007 | } |
1008 | ||
1e511322 KS |
1009 | /** |
1010 | * udev_device_get_parent_with_subsystem_devtype: | |
1011 | * @udev_device: udev device to start searching from | |
214a6c79 | 1012 | * @subsystem: the subsystem of the device |
1e511322 KS |
1013 | * @devtype: the type (DEVTYPE) of the device |
1014 | * | |
1015 | * Find the next parent device, with a matching subsystem and devtype | |
1016 | * value, and fill in information from the sys device and the udev | |
1017 | * database entry. | |
1018 | * | |
79ef2e97 | 1019 | * If devtype is #NULL, only subsystem is checked, and any devtype will |
54d4f54e MP |
1020 | * match. |
1021 | * | |
572ce4f7 ZJS |
1022 | * Returned device is not referenced. It is attached to the child |
1023 | * device, and will be cleaned up when the child device is cleaned up. | |
1e511322 KS |
1024 | * |
1025 | * It can be called as many times as needed, without caring about | |
1026 | * references. | |
1027 | * | |
8d6bc73a | 1028 | * Returns: a new udev device, or #NULL if no matching parent exists. |
1e511322 | 1029 | **/ |
54cf0b7f | 1030 | _public_ struct udev_device *udev_device_get_parent_with_subsystem_devtype(struct udev_device *udev_device, const char *subsystem, const char *devtype) |
bf8b2ae1 | 1031 | { |
912541b0 | 1032 | struct udev_device *parent; |
bf8b2ae1 | 1033 | |
912541b0 KS |
1034 | if (subsystem == NULL) |
1035 | return NULL; | |
883012d4 | 1036 | |
912541b0 KS |
1037 | parent = udev_device_get_parent(udev_device); |
1038 | while (parent != NULL) { | |
1039 | const char *parent_subsystem; | |
1040 | const char *parent_devtype; | |
bf8b2ae1 | 1041 | |
912541b0 | 1042 | parent_subsystem = udev_device_get_subsystem(parent); |
33502ffe | 1043 | if (parent_subsystem != NULL && streq(parent_subsystem, subsystem)) { |
912541b0 KS |
1044 | if (devtype == NULL) |
1045 | break; | |
1046 | parent_devtype = udev_device_get_devtype(parent); | |
33502ffe | 1047 | if (parent_devtype != NULL && streq(parent_devtype, devtype)) |
912541b0 KS |
1048 | break; |
1049 | } | |
1050 | parent = udev_device_get_parent(parent); | |
1051 | } | |
1052 | return parent; | |
bf8b2ae1 MH |
1053 | } |
1054 | ||
eb1f0e66 KS |
1055 | /** |
1056 | * udev_device_get_udev: | |
7d8787b3 | 1057 | * @udev_device: udev device |
eb1f0e66 KS |
1058 | * |
1059 | * Retrieve the udev library context the device was created with. | |
1060 | * | |
1061 | * Returns: the udev library context | |
1062 | **/ | |
54cf0b7f | 1063 | _public_ struct udev *udev_device_get_udev(struct udev_device *udev_device) |
eb1f0e66 | 1064 | { |
912541b0 KS |
1065 | if (udev_device == NULL) |
1066 | return NULL; | |
1067 | return udev_device->udev; | |
eb1f0e66 KS |
1068 | } |
1069 | ||
1070 | /** | |
1071 | * udev_device_ref: | |
1072 | * @udev_device: udev device | |
1073 | * | |
1074 | * Take a reference of a udev device. | |
1075 | * | |
1076 | * Returns: the passed udev device | |
1077 | **/ | |
54cf0b7f | 1078 | _public_ struct udev_device *udev_device_ref(struct udev_device *udev_device) |
eb1f0e66 | 1079 | { |
912541b0 KS |
1080 | if (udev_device == NULL) |
1081 | return NULL; | |
1082 | udev_device->refcount++; | |
1083 | return udev_device; | |
eb1f0e66 KS |
1084 | } |
1085 | ||
1086 | /** | |
1087 | * udev_device_unref: | |
1088 | * @udev_device: udev device | |
1089 | * | |
1090 | * Drop a reference of a udev device. If the refcount reaches zero, | |
be7de409 | 1091 | * the resources of the device will be released. |
eb1f0e66 | 1092 | * |
725d7e6c | 1093 | * Returns: #NULL |
eb1f0e66 | 1094 | **/ |
20bbd54f | 1095 | _public_ struct udev_device *udev_device_unref(struct udev_device *udev_device) |
eb1f0e66 | 1096 | { |
912541b0 | 1097 | if (udev_device == NULL) |
20bbd54f | 1098 | return NULL; |
912541b0 KS |
1099 | udev_device->refcount--; |
1100 | if (udev_device->refcount > 0) | |
725d7e6c | 1101 | return NULL; |
912541b0 KS |
1102 | if (udev_device->parent_device != NULL) |
1103 | udev_device_unref(udev_device->parent_device); | |
1104 | free(udev_device->syspath); | |
1105 | free(udev_device->sysname); | |
1106 | free(udev_device->devnode); | |
1107 | free(udev_device->subsystem); | |
1108 | free(udev_device->devtype); | |
1109 | udev_list_cleanup(&udev_device->devlinks_list); | |
1110 | udev_list_cleanup(&udev_device->properties_list); | |
1111 | udev_list_cleanup(&udev_device->sysattr_value_list); | |
1112 | udev_list_cleanup(&udev_device->sysattr_list); | |
1113 | udev_list_cleanup(&udev_device->tags_list); | |
1114 | free(udev_device->action); | |
1115 | free(udev_device->driver); | |
1116 | free(udev_device->devpath_old); | |
1117 | free(udev_device->id_filename); | |
1118 | free(udev_device->envp); | |
1119 | free(udev_device->monitor_buf); | |
912541b0 | 1120 | free(udev_device); |
20bbd54f | 1121 | return NULL; |
eb1f0e66 KS |
1122 | } |
1123 | ||
1124 | /** | |
1125 | * udev_device_get_devpath: | |
1126 | * @udev_device: udev device | |
1127 | * | |
11d543c1 KS |
1128 | * Retrieve the kernel devpath value of the udev device. The path |
1129 | * does not contain the sys mount point, and starts with a '/'. | |
eb1f0e66 | 1130 | * |
11d543c1 | 1131 | * Returns: the devpath of the udev device |
eb1f0e66 | 1132 | **/ |
54cf0b7f | 1133 | _public_ const char *udev_device_get_devpath(struct udev_device *udev_device) |
eb1f0e66 | 1134 | { |
912541b0 KS |
1135 | if (udev_device == NULL) |
1136 | return NULL; | |
1137 | return udev_device->devpath; | |
eb1f0e66 KS |
1138 | } |
1139 | ||
11d543c1 KS |
1140 | /** |
1141 | * udev_device_get_syspath: | |
1142 | * @udev_device: udev device | |
1143 | * | |
1144 | * Retrieve the sys path of the udev device. The path is an | |
1145 | * absolute path and starts with the sys mount point. | |
1146 | * | |
1147 | * Returns: the sys path of the udev device | |
1148 | **/ | |
54cf0b7f | 1149 | _public_ const char *udev_device_get_syspath(struct udev_device *udev_device) |
11d543c1 | 1150 | { |
912541b0 KS |
1151 | if (udev_device == NULL) |
1152 | return NULL; | |
1153 | return udev_device->syspath; | |
11d543c1 KS |
1154 | } |
1155 | ||
1e511322 KS |
1156 | /** |
1157 | * udev_device_get_sysname: | |
1158 | * @udev_device: udev device | |
1159 | * | |
21dbe43a KS |
1160 | * Get the kernel device name in /sys. |
1161 | * | |
1162 | * Returns: the name string of the device device | |
1e511322 | 1163 | **/ |
54cf0b7f | 1164 | _public_ const char *udev_device_get_sysname(struct udev_device *udev_device) |
4ad3a37f | 1165 | { |
912541b0 KS |
1166 | if (udev_device == NULL) |
1167 | return NULL; | |
1168 | return udev_device->sysname; | |
4ad3a37f KS |
1169 | } |
1170 | ||
1e511322 KS |
1171 | /** |
1172 | * udev_device_get_sysnum: | |
1173 | * @udev_device: udev device | |
1174 | * | |
21dbe43a KS |
1175 | * Get the instance number of the device. |
1176 | * | |
c5315881 | 1177 | * Returns: the trailing number string of the device name |
1e511322 | 1178 | **/ |
54cf0b7f | 1179 | _public_ const char *udev_device_get_sysnum(struct udev_device *udev_device) |
517814e7 | 1180 | { |
912541b0 KS |
1181 | if (udev_device == NULL) |
1182 | return NULL; | |
1183 | return udev_device->sysnum; | |
517814e7 KS |
1184 | } |
1185 | ||
eb1f0e66 | 1186 | /** |
fb762bb9 | 1187 | * udev_device_get_devnode: |
eb1f0e66 KS |
1188 | * @udev_device: udev device |
1189 | * | |
1190 | * Retrieve the device node file name belonging to the udev device. | |
ba6929f6 | 1191 | * The path is an absolute path, and starts with the device directory. |
eb1f0e66 KS |
1192 | * |
1193 | * Returns: the device node file name of the udev device, or #NULL if no device node exists | |
1194 | **/ | |
54cf0b7f | 1195 | _public_ const char *udev_device_get_devnode(struct udev_device *udev_device) |
eb1f0e66 | 1196 | { |
912541b0 KS |
1197 | if (udev_device == NULL) |
1198 | return NULL; | |
1199 | if (udev_device->devnode != NULL) | |
1200 | return udev_device->devnode; | |
1201 | if (!udev_device->info_loaded) | |
1202 | udev_device_read_uevent_file(udev_device); | |
1203 | return udev_device->devnode; | |
eb1f0e66 KS |
1204 | } |
1205 | ||
eb1f0e66 | 1206 | /** |
0de33a61 | 1207 | * udev_device_get_devlinks_list_entry: |
eb1f0e66 | 1208 | * @udev_device: udev device |
eb1f0e66 | 1209 | * |
bf7ad0ea KS |
1210 | * Retrieve the list of device links pointing to the device file of |
1211 | * the udev device. The next list entry can be retrieved with | |
bb061708 | 1212 | * udev_list_entry_get_next(), which returns #NULL if no more entries exist. |
bf7ad0ea | 1213 | * The devlink path can be retrieved from the list entry by |
e345e267 | 1214 | * udev_list_entry_get_name(). The path is an absolute path, and starts with |
bf7ad0ea | 1215 | * the device directory. |
eb1f0e66 | 1216 | * |
bf7ad0ea | 1217 | * Returns: the first entry of the device node link list |
eb1f0e66 | 1218 | **/ |
54cf0b7f | 1219 | _public_ struct udev_list_entry *udev_device_get_devlinks_list_entry(struct udev_device *udev_device) |
eb1f0e66 | 1220 | { |
912541b0 KS |
1221 | if (udev_device == NULL) |
1222 | return NULL; | |
1223 | if (!udev_device->info_loaded) | |
1224 | udev_device_read_db(udev_device, NULL); | |
1225 | return udev_list_get_entry(&udev_device->devlinks_list); | |
eb1f0e66 KS |
1226 | } |
1227 | ||
979ff016 KS |
1228 | void udev_device_cleanup_devlinks_list(struct udev_device *udev_device) |
1229 | { | |
912541b0 KS |
1230 | udev_device->devlinks_uptodate = false; |
1231 | udev_list_cleanup(&udev_device->devlinks_list); | |
979ff016 KS |
1232 | } |
1233 | ||
eb1f0e66 | 1234 | /** |
0de33a61 | 1235 | * udev_device_get_properties_list_entry: |
eb1f0e66 | 1236 | * @udev_device: udev device |
eb1f0e66 | 1237 | * |
bf7ad0ea | 1238 | * Retrieve the list of key/value device properties of the udev |
bb061708 | 1239 | * device. The next list entry can be retrieved with udev_list_entry_get_next(), |
bf7ad0ea | 1240 | * which returns #NULL if no more entries exist. The property name |
bb061708 KS |
1241 | * can be retrieved from the list entry by udev_list_entry_get_name(), |
1242 | * the property value by udev_list_entry_get_value(). | |
eb1f0e66 | 1243 | * |
bf7ad0ea | 1244 | * Returns: the first entry of the property list |
eb1f0e66 | 1245 | **/ |
54cf0b7f | 1246 | _public_ struct udev_list_entry *udev_device_get_properties_list_entry(struct udev_device *udev_device) |
eb1f0e66 | 1247 | { |
912541b0 KS |
1248 | if (udev_device == NULL) |
1249 | return NULL; | |
1250 | if (!udev_device->info_loaded) { | |
1251 | udev_device_read_uevent_file(udev_device); | |
1252 | udev_device_read_db(udev_device, NULL); | |
1253 | } | |
1254 | if (!udev_device->devlinks_uptodate) { | |
1255 | char symlinks[UTIL_PATH_SIZE]; | |
1256 | struct udev_list_entry *list_entry; | |
1257 | ||
1258 | udev_device->devlinks_uptodate = true; | |
1259 | list_entry = udev_device_get_devlinks_list_entry(udev_device); | |
1260 | if (list_entry != NULL) { | |
1261 | char *s; | |
1262 | size_t l; | |
1263 | ||
1264 | s = symlinks; | |
d5a89d7d | 1265 | l = strpcpyl(&s, sizeof(symlinks), udev_list_entry_get_name(list_entry), NULL); |
912541b0 | 1266 | udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry)) |
d5a89d7d | 1267 | l = strpcpyl(&s, l, " ", udev_list_entry_get_name(list_entry), NULL); |
912541b0 KS |
1268 | udev_device_add_property(udev_device, "DEVLINKS", symlinks); |
1269 | } | |
1270 | } | |
1271 | if (!udev_device->tags_uptodate) { | |
1272 | udev_device->tags_uptodate = true; | |
1273 | if (udev_device_get_tags_list_entry(udev_device) != NULL) { | |
1274 | char tags[UTIL_PATH_SIZE]; | |
1275 | struct udev_list_entry *list_entry; | |
1276 | char *s; | |
1277 | size_t l; | |
1278 | ||
1279 | s = tags; | |
d5a89d7d | 1280 | l = strpcpyl(&s, sizeof(tags), ":", NULL); |
912541b0 | 1281 | udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(udev_device)) |
d5a89d7d | 1282 | l = strpcpyl(&s, l, udev_list_entry_get_name(list_entry), ":", NULL); |
912541b0 KS |
1283 | udev_device_add_property(udev_device, "TAGS", tags); |
1284 | } | |
1285 | } | |
1286 | return udev_list_get_entry(&udev_device->properties_list); | |
eb1f0e66 | 1287 | } |
11d543c1 | 1288 | |
1e511322 KS |
1289 | /** |
1290 | * udev_device_get_action: | |
1291 | * @udev_device: udev device | |
1292 | * | |
1293 | * This is only valid if the device was received through a monitor. Devices read from | |
1294 | * sys do not have an action string. Usual actions are: add, remove, change, online, | |
1295 | * offline. | |
1296 | * | |
1297 | * Returns: the kernel action value, or #NULL if there is no action value available. | |
1298 | **/ | |
54cf0b7f | 1299 | _public_ const char *udev_device_get_action(struct udev_device *udev_device) |
c4f5f942 | 1300 | { |
912541b0 KS |
1301 | if (udev_device == NULL) |
1302 | return NULL; | |
1303 | return udev_device->action; | |
c4f5f942 KS |
1304 | } |
1305 | ||
9c6a11b1 KS |
1306 | /** |
1307 | * udev_device_get_usec_since_initialized: | |
1308 | * @udev_device: udev device | |
1309 | * | |
1310 | * Return the number of microseconds passed since udev set up the | |
1311 | * device for the first time. | |
1312 | * | |
1313 | * This is only implemented for devices with need to store properties | |
1314 | * in the udev database. All other devices return 0 here. | |
1315 | * | |
1316 | * Returns: the number of microseconds since the device was first seen. | |
1317 | **/ | |
54cf0b7f | 1318 | _public_ unsigned long long int udev_device_get_usec_since_initialized(struct udev_device *udev_device) |
9c6a11b1 | 1319 | { |
40fe8b11 | 1320 | usec_t now_ts; |
9c6a11b1 | 1321 | |
912541b0 KS |
1322 | if (udev_device == NULL) |
1323 | return 0; | |
1324 | if (!udev_device->info_loaded) | |
1325 | udev_device_read_db(udev_device, NULL); | |
1326 | if (udev_device->usec_initialized == 0) | |
1327 | return 0; | |
40fe8b11 | 1328 | now_ts = now(CLOCK_MONOTONIC); |
33502ffe | 1329 | if (now_ts == 0) |
912541b0 | 1330 | return 0; |
33502ffe | 1331 | return now_ts - udev_device->usec_initialized; |
9c6a11b1 KS |
1332 | } |
1333 | ||
40fe8b11 | 1334 | usec_t udev_device_get_usec_initialized(struct udev_device *udev_device) |
9c6a11b1 | 1335 | { |
912541b0 | 1336 | return udev_device->usec_initialized; |
9c6a11b1 KS |
1337 | } |
1338 | ||
40fe8b11 | 1339 | void udev_device_set_usec_initialized(struct udev_device *udev_device, usec_t usec_initialized) |
9c6a11b1 | 1340 | { |
912541b0 | 1341 | char num[32]; |
a20a57a7 | 1342 | |
912541b0 | 1343 | udev_device->usec_initialized = usec_initialized; |
de0671ee | 1344 | snprintf(num, sizeof(num), USEC_FMT, usec_initialized); |
912541b0 | 1345 | udev_device_add_property(udev_device, "USEC_INITIALIZED", num); |
9c6a11b1 KS |
1346 | } |
1347 | ||
1e511322 KS |
1348 | /** |
1349 | * udev_device_get_sysattr_value: | |
1350 | * @udev_device: udev device | |
1351 | * @sysattr: attribute name | |
1352 | * | |
456719b6 | 1353 | * The retrieved value is cached in the device. Repeated calls will return the same |
1e511322 KS |
1354 | * value and not open the attribute again. |
1355 | * | |
1356 | * Returns: the content of a sys attribute file, or #NULL if there is no sys attribute value. | |
1357 | **/ | |
54cf0b7f | 1358 | _public_ const char *udev_device_get_sysattr_value(struct udev_device *udev_device, const char *sysattr) |
93b0f384 | 1359 | { |
912541b0 KS |
1360 | struct udev_list_entry *list_entry; |
1361 | char path[UTIL_PATH_SIZE]; | |
1362 | char value[4096]; | |
1363 | struct stat statbuf; | |
1364 | int fd; | |
1365 | ssize_t size; | |
1366 | const char *val = NULL; | |
1367 | ||
1368 | if (udev_device == NULL) | |
1369 | return NULL; | |
1370 | if (sysattr == NULL) | |
1371 | return NULL; | |
1372 | ||
1373 | /* look for possibly already cached result */ | |
1374 | list_entry = udev_list_get_entry(&udev_device->sysattr_value_list); | |
1375 | list_entry = udev_list_entry_get_by_name(list_entry, sysattr); | |
baa30fbc | 1376 | if (list_entry != NULL) |
912541b0 | 1377 | return udev_list_entry_get_value(list_entry); |
912541b0 | 1378 | |
d5a89d7d | 1379 | strscpyl(path, sizeof(path), udev_device_get_syspath(udev_device), "/", sysattr, NULL); |
912541b0 | 1380 | if (lstat(path, &statbuf) != 0) { |
912541b0 KS |
1381 | udev_list_entry_add(&udev_device->sysattr_value_list, sysattr, NULL); |
1382 | goto out; | |
1383 | } | |
1384 | ||
1385 | if (S_ISLNK(statbuf.st_mode)) { | |
912541b0 KS |
1386 | /* |
1387 | * Some core links return only the last element of the target path, | |
1388 | * these are just values, the paths should not be exposed. | |
1389 | */ | |
33502ffe KS |
1390 | if (streq(sysattr, "driver") || |
1391 | streq(sysattr, "subsystem") || | |
1392 | streq(sysattr, "module")) { | |
912541b0 KS |
1393 | if (util_get_sys_core_link_value(udev_device->udev, sysattr, |
1394 | udev_device->syspath, value, sizeof(value)) < 0) | |
1395 | return NULL; | |
912541b0 KS |
1396 | list_entry = udev_list_entry_add(&udev_device->sysattr_value_list, sysattr, value); |
1397 | val = udev_list_entry_get_value(list_entry); | |
1398 | goto out; | |
1399 | } | |
1400 | ||
912541b0 KS |
1401 | goto out; |
1402 | } | |
1403 | ||
1404 | /* skip directories */ | |
1405 | if (S_ISDIR(statbuf.st_mode)) | |
1406 | goto out; | |
1407 | ||
1408 | /* skip non-readable files */ | |
1409 | if ((statbuf.st_mode & S_IRUSR) == 0) | |
1410 | goto out; | |
1411 | ||
1412 | /* read attribute value */ | |
1413 | fd = open(path, O_RDONLY|O_CLOEXEC); | |
baa30fbc | 1414 | if (fd < 0) |
912541b0 | 1415 | goto out; |
912541b0 KS |
1416 | size = read(fd, value, sizeof(value)); |
1417 | close(fd); | |
1418 | if (size < 0) | |
1419 | goto out; | |
1420 | if (size == sizeof(value)) | |
1421 | goto out; | |
1422 | ||
1423 | /* got a valid value, store it in cache and return it */ | |
1424 | value[size] = '\0'; | |
1425 | util_remove_trailing_chars(value, '\n'); | |
912541b0 KS |
1426 | list_entry = udev_list_entry_add(&udev_device->sysattr_value_list, sysattr, value); |
1427 | val = udev_list_entry_get_value(list_entry); | |
93b0f384 | 1428 | out: |
912541b0 | 1429 | return val; |
93b0f384 | 1430 | } |
517814e7 | 1431 | |
946f1825 HR |
1432 | /** |
1433 | * udev_device_set_sysattr_value: | |
1434 | * @udev_device: udev device | |
1435 | * @sysattr: attribute name | |
1436 | * @value: new value to be set | |
1437 | * | |
1438 | * Update the contents of the sys attribute and the cached value of the device. | |
1439 | * | |
1440 | * Returns: Negative error code on failure or 0 on success. | |
1441 | **/ | |
1442 | _public_ int udev_device_set_sysattr_value(struct udev_device *udev_device, const char *sysattr, char *value) | |
1443 | { | |
1444 | struct udev_device *dev; | |
1445 | char path[UTIL_PATH_SIZE]; | |
1446 | struct stat statbuf; | |
1447 | int fd; | |
1448 | ssize_t size, value_len; | |
1449 | int ret = 0; | |
1450 | ||
1451 | if (udev_device == NULL) | |
1452 | return -EINVAL; | |
1453 | dev = udev_device; | |
1454 | if (sysattr == NULL) | |
1455 | return -EINVAL; | |
1456 | if (value == NULL) | |
1457 | value_len = 0; | |
1458 | else | |
1459 | value_len = strlen(value); | |
53726349 | 1460 | |
946f1825 HR |
1461 | strscpyl(path, sizeof(path), udev_device_get_syspath(dev), "/", sysattr, NULL); |
1462 | if (lstat(path, &statbuf) != 0) { | |
1463 | udev_list_entry_add(&dev->sysattr_value_list, sysattr, NULL); | |
1464 | ret = -ENXIO; | |
1465 | goto out; | |
1466 | } | |
1467 | ||
1468 | if (S_ISLNK(statbuf.st_mode)) { | |
53726349 | 1469 | ret = -EINVAL; |
946f1825 HR |
1470 | goto out; |
1471 | } | |
1472 | ||
1473 | /* skip directories */ | |
1474 | if (S_ISDIR(statbuf.st_mode)) { | |
1475 | ret = -EISDIR; | |
1476 | goto out; | |
1477 | } | |
1478 | ||
1479 | /* skip non-readable files */ | |
1480 | if ((statbuf.st_mode & S_IRUSR) == 0) { | |
1481 | ret = -EACCES; | |
1482 | goto out; | |
1483 | } | |
1484 | ||
1485 | /* Value is limited to 4k */ | |
1486 | if (value_len > 4096) { | |
1487 | ret = -EINVAL; | |
1488 | goto out; | |
1489 | } | |
1490 | util_remove_trailing_chars(value, '\n'); | |
1491 | ||
1492 | /* write attribute value */ | |
1493 | fd = open(path, O_WRONLY|O_CLOEXEC); | |
1494 | if (fd < 0) { | |
1495 | ret = -errno; | |
1496 | goto out; | |
1497 | } | |
1498 | size = write(fd, value, value_len); | |
1499 | close(fd); | |
1500 | if (size < 0) { | |
1501 | ret = -errno; | |
1502 | goto out; | |
1503 | } | |
1504 | if (size < value_len) { | |
1505 | ret = -EIO; | |
1506 | goto out; | |
1507 | } | |
1508 | ||
1509 | /* wrote a valid value, store it in cache and return it */ | |
1510 | udev_list_entry_add(&dev->sysattr_value_list, sysattr, value); | |
1511 | out: | |
1512 | if (dev != udev_device) | |
1513 | udev_device_unref(dev); | |
1514 | return ret; | |
1515 | } | |
1516 | ||
20bee04c | 1517 | static int udev_device_sysattr_list_read(struct udev_device *udev_device) |
f180ad25 | 1518 | { |
912541b0 KS |
1519 | struct dirent *dent; |
1520 | DIR *dir; | |
1521 | int num = 0; | |
f180ad25 | 1522 | |
912541b0 | 1523 | if (udev_device == NULL) |
994e0234 | 1524 | return -EINVAL; |
912541b0 KS |
1525 | if (udev_device->sysattr_list_read) |
1526 | return 0; | |
f180ad25 | 1527 | |
912541b0 | 1528 | dir = opendir(udev_device_get_syspath(udev_device)); |
baa30fbc | 1529 | if (!dir) |
994e0234 | 1530 | return -errno; |
f180ad25 | 1531 | |
912541b0 KS |
1532 | for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) { |
1533 | char path[UTIL_PATH_SIZE]; | |
1534 | struct stat statbuf; | |
f180ad25 | 1535 | |
912541b0 KS |
1536 | /* only handle symlinks and regular files */ |
1537 | if (dent->d_type != DT_LNK && dent->d_type != DT_REG) | |
1538 | continue; | |
f180ad25 | 1539 | |
d5a89d7d | 1540 | strscpyl(path, sizeof(path), udev_device_get_syspath(udev_device), "/", dent->d_name, NULL); |
912541b0 KS |
1541 | if (lstat(path, &statbuf) != 0) |
1542 | continue; | |
1543 | if ((statbuf.st_mode & S_IRUSR) == 0) | |
1544 | continue; | |
f180ad25 | 1545 | |
912541b0 KS |
1546 | udev_list_entry_add(&udev_device->sysattr_list, dent->d_name, NULL); |
1547 | num++; | |
1548 | } | |
f180ad25 | 1549 | |
912541b0 | 1550 | closedir(dir); |
912541b0 | 1551 | udev_device->sysattr_list_read = true; |
f180ad25 | 1552 | |
912541b0 | 1553 | return num; |
f180ad25 TE |
1554 | } |
1555 | ||
1556 | /** | |
1557 | * udev_device_get_sysattr_list_entry: | |
1558 | * @udev_device: udev device | |
1559 | * | |
1560 | * Retrieve the list of available sysattrs, with value being empty; | |
20bee04c KS |
1561 | * This just return all available sysfs attributes for a particular |
1562 | * device without reading their values. | |
f180ad25 TE |
1563 | * |
1564 | * Returns: the first entry of the property list | |
1565 | **/ | |
54cf0b7f | 1566 | _public_ struct udev_list_entry *udev_device_get_sysattr_list_entry(struct udev_device *udev_device) |
f180ad25 | 1567 | { |
912541b0 KS |
1568 | if (!udev_device->sysattr_list_read) { |
1569 | int ret; | |
1570 | ret = udev_device_sysattr_list_read(udev_device); | |
1571 | if (0 > ret) | |
1572 | return NULL; | |
1573 | } | |
f180ad25 | 1574 | |
912541b0 | 1575 | return udev_list_get_entry(&udev_device->sysattr_list); |
f180ad25 TE |
1576 | } |
1577 | ||
8cd2e972 | 1578 | int udev_device_set_syspath(struct udev_device *udev_device, const char *syspath) |
11d543c1 | 1579 | { |
912541b0 KS |
1580 | const char *pos; |
1581 | size_t len; | |
8753fadf | 1582 | |
912541b0 KS |
1583 | free(udev_device->syspath); |
1584 | udev_device->syspath = strdup(syspath); | |
1585 | if (udev_device->syspath == NULL) | |
1586 | return -ENOMEM; | |
4cb72937 | 1587 | udev_device->devpath = udev_device->syspath + strlen("/sys"); |
912541b0 | 1588 | udev_device_add_property(udev_device, "DEVPATH", udev_device->devpath); |
517814e7 | 1589 | |
912541b0 KS |
1590 | pos = strrchr(udev_device->syspath, '/'); |
1591 | if (pos == NULL) | |
1592 | return -EINVAL; | |
1593 | udev_device->sysname = strdup(&pos[1]); | |
1594 | if (udev_device->sysname == NULL) | |
1595 | return -ENOMEM; | |
517814e7 | 1596 | |
912541b0 KS |
1597 | /* some devices have '!' in their name, change that to '/' */ |
1598 | len = 0; | |
1599 | while (udev_device->sysname[len] != '\0') { | |
1600 | if (udev_device->sysname[len] == '!') | |
1601 | udev_device->sysname[len] = '/'; | |
1602 | len++; | |
1603 | } | |
517814e7 | 1604 | |
912541b0 KS |
1605 | /* trailing number */ |
1606 | while (len > 0 && isdigit(udev_device->sysname[--len])) | |
1607 | udev_device->sysnum = &udev_device->sysname[len]; | |
babcf3cb | 1608 | |
912541b0 KS |
1609 | /* sysname is completely numeric */ |
1610 | if (len == 0) | |
1611 | udev_device->sysnum = NULL; | |
babcf3cb | 1612 | |
912541b0 | 1613 | return 0; |
11d543c1 KS |
1614 | } |
1615 | ||
b2661839 | 1616 | static int udev_device_set_devnode(struct udev_device *udev_device, const char *devnode) |
11d543c1 | 1617 | { |
912541b0 KS |
1618 | free(udev_device->devnode); |
1619 | if (devnode[0] != '/') { | |
4cb72937 | 1620 | if (asprintf(&udev_device->devnode, "/dev/%s", devnode) < 0) |
912541b0 KS |
1621 | udev_device->devnode = NULL; |
1622 | } else { | |
1623 | udev_device->devnode = strdup(devnode); | |
1624 | } | |
1625 | if (udev_device->devnode == NULL) | |
1626 | return -ENOMEM; | |
1627 | udev_device_add_property(udev_device, "DEVNAME", udev_device->devnode); | |
1628 | return 0; | |
11d543c1 KS |
1629 | } |
1630 | ||
8a173387 | 1631 | int udev_device_add_devlink(struct udev_device *udev_device, const char *devlink) |
11d543c1 | 1632 | { |
912541b0 | 1633 | struct udev_list_entry *list_entry; |
6c29f2b9 | 1634 | |
912541b0 KS |
1635 | udev_device->devlinks_uptodate = false; |
1636 | list_entry = udev_list_entry_add(&udev_device->devlinks_list, devlink, NULL); | |
1637 | if (list_entry == NULL) | |
1638 | return -ENOMEM; | |
912541b0 | 1639 | return 0; |
11d543c1 KS |
1640 | } |
1641 | ||
4281da1f KS |
1642 | const char *udev_device_get_id_filename(struct udev_device *udev_device) |
1643 | { | |
912541b0 KS |
1644 | if (udev_device->id_filename == NULL) { |
1645 | if (udev_device_get_subsystem(udev_device) == NULL) | |
1646 | return NULL; | |
1647 | ||
1648 | if (major(udev_device_get_devnum(udev_device)) > 0) { | |
1649 | /* use dev_t -- b259:131072, c254:0 */ | |
1650 | if (asprintf(&udev_device->id_filename, "%c%u:%u", | |
33502ffe | 1651 | streq(udev_device_get_subsystem(udev_device), "block") ? 'b' : 'c', |
912541b0 KS |
1652 | major(udev_device_get_devnum(udev_device)), |
1653 | minor(udev_device_get_devnum(udev_device))) < 0) | |
1654 | udev_device->id_filename = NULL; | |
1655 | } else if (udev_device_get_ifindex(udev_device) > 0) { | |
1656 | /* use netdev ifindex -- n3 */ | |
1657 | if (asprintf(&udev_device->id_filename, "n%u", udev_device_get_ifindex(udev_device)) < 0) | |
1658 | udev_device->id_filename = NULL; | |
1659 | } else { | |
1660 | /* | |
1661 | * use $subsys:$syname -- pci:0000:00:1f.2 | |
1662 | * sysname() has '!' translated, get it from devpath | |
1663 | */ | |
1664 | const char *sysname; | |
1665 | sysname = strrchr(udev_device->devpath, '/'); | |
1666 | if (sysname == NULL) | |
1667 | return NULL; | |
1668 | sysname = &sysname[1]; | |
1669 | if (asprintf(&udev_device->id_filename, "+%s:%s", udev_device_get_subsystem(udev_device), sysname) < 0) | |
1670 | udev_device->id_filename = NULL; | |
1671 | } | |
1672 | } | |
1673 | return udev_device->id_filename; | |
4281da1f KS |
1674 | } |
1675 | ||
48a0170b KS |
1676 | /** |
1677 | * udev_device_get_is_initialized: | |
1678 | * @udev_device: udev device | |
1679 | * | |
1680 | * Check if udev has already handled the device and has set up | |
1681 | * device node permissions and context, or has renamed a network | |
1682 | * device. | |
1683 | * | |
9c6a11b1 | 1684 | * This is only implemented for devices with a device node |
48a0170b KS |
1685 | * or network interfaces. All other devices return 1 here. |
1686 | * | |
1687 | * Returns: 1 if the device is set up. 0 otherwise. | |
1688 | **/ | |
54cf0b7f | 1689 | _public_ int udev_device_get_is_initialized(struct udev_device *udev_device) |
48a0170b | 1690 | { |
912541b0 KS |
1691 | if (!udev_device->info_loaded) |
1692 | udev_device_read_db(udev_device, NULL); | |
1693 | return udev_device->is_initialized; | |
48a0170b KS |
1694 | } |
1695 | ||
1696 | void udev_device_set_is_initialized(struct udev_device *udev_device) | |
1697 | { | |
912541b0 | 1698 | udev_device->is_initialized = true; |
48a0170b KS |
1699 | } |
1700 | ||
28460195 KS |
1701 | int udev_device_add_tag(struct udev_device *udev_device, const char *tag) |
1702 | { | |
912541b0 KS |
1703 | if (strchr(tag, ':') != NULL || strchr(tag, ' ') != NULL) |
1704 | return -EINVAL; | |
1705 | udev_device->tags_uptodate = false; | |
1706 | if (udev_list_entry_add(&udev_device->tags_list, tag, NULL) != NULL) | |
1707 | return 0; | |
1708 | return -ENOMEM; | |
28460195 KS |
1709 | } |
1710 | ||
1711 | void udev_device_cleanup_tags_list(struct udev_device *udev_device) | |
1712 | { | |
912541b0 KS |
1713 | udev_device->tags_uptodate = false; |
1714 | udev_list_cleanup(&udev_device->tags_list); | |
28460195 KS |
1715 | } |
1716 | ||
f712894d KS |
1717 | /** |
1718 | * udev_device_get_tags_list_entry: | |
1719 | * @udev_device: udev device | |
1720 | * | |
1721 | * Retrieve the list of tags attached to the udev device. The next | |
bb061708 | 1722 | * list entry can be retrieved with udev_list_entry_get_next(), |
f712894d | 1723 | * which returns #NULL if no more entries exist. The tag string |
bb061708 | 1724 | * can be retrieved from the list entry by udev_list_entry_get_name(). |
f712894d KS |
1725 | * |
1726 | * Returns: the first entry of the tag list | |
1727 | **/ | |
54cf0b7f | 1728 | _public_ struct udev_list_entry *udev_device_get_tags_list_entry(struct udev_device *udev_device) |
28460195 | 1729 | { |
912541b0 KS |
1730 | if (udev_device == NULL) |
1731 | return NULL; | |
1732 | if (!udev_device->info_loaded) | |
1733 | udev_device_read_db(udev_device, NULL); | |
1734 | return udev_list_get_entry(&udev_device->tags_list); | |
28460195 KS |
1735 | } |
1736 | ||
21dbe43a KS |
1737 | /** |
1738 | * udev_device_has_tag: | |
1739 | * @udev_device: udev device | |
1740 | * @tag: tag name | |
1741 | * | |
1742 | * Check if a given device has a certain tag associated. | |
1743 | * | |
1744 | * Returns: 1 if the tag is found. 0 otherwise. | |
1745 | **/ | |
54cf0b7f | 1746 | _public_ int udev_device_has_tag(struct udev_device *udev_device, const char *tag) |
28460195 | 1747 | { |
912541b0 | 1748 | struct udev_list_entry *list_entry; |
28460195 | 1749 | |
912541b0 KS |
1750 | if (udev_device == NULL) |
1751 | return false; | |
1752 | if (!udev_device->info_loaded) | |
1753 | udev_device_read_db(udev_device, NULL); | |
1754 | list_entry = udev_device_get_tags_list_entry(udev_device); | |
1755 | if (udev_list_entry_get_by_name(list_entry, tag) != NULL) | |
1756 | return true; | |
1757 | return false; | |
28460195 KS |
1758 | } |
1759 | ||
912541b0 KS |
1760 | #define ENVP_SIZE 128 |
1761 | #define MONITOR_BUF_SIZE 4096 | |
6493e655 | 1762 | static int update_envp_monitor_buf(struct udev_device *udev_device) |
979ff016 | 1763 | { |
912541b0 KS |
1764 | struct udev_list_entry *list_entry; |
1765 | char *s; | |
1766 | size_t l; | |
1767 | unsigned int i; | |
1768 | ||
1769 | /* monitor buffer of property strings */ | |
1770 | free(udev_device->monitor_buf); | |
1771 | udev_device->monitor_buf_len = 0; | |
1772 | udev_device->monitor_buf = malloc(MONITOR_BUF_SIZE); | |
1773 | if (udev_device->monitor_buf == NULL) | |
1774 | return -ENOMEM; | |
1775 | ||
1776 | /* envp array, strings will point into monitor buffer */ | |
1777 | if (udev_device->envp == NULL) | |
1778 | udev_device->envp = malloc(sizeof(char *) * ENVP_SIZE); | |
1779 | if (udev_device->envp == NULL) | |
1780 | return -ENOMEM; | |
1781 | ||
1782 | i = 0; | |
1783 | s = udev_device->monitor_buf; | |
1784 | l = MONITOR_BUF_SIZE; | |
1785 | udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device)) { | |
1786 | const char *key; | |
1787 | ||
1788 | key = udev_list_entry_get_name(list_entry); | |
1789 | /* skip private variables */ | |
1790 | if (key[0] == '.') | |
1791 | continue; | |
1792 | ||
1793 | /* add string to envp array */ | |
1794 | udev_device->envp[i++] = s; | |
1795 | if (i+1 >= ENVP_SIZE) | |
1796 | return -EINVAL; | |
1797 | ||
1798 | /* add property string to monitor buffer */ | |
d5a89d7d | 1799 | l = strpcpyl(&s, l, key, "=", udev_list_entry_get_value(list_entry), NULL); |
912541b0 KS |
1800 | if (l == 0) |
1801 | return -EINVAL; | |
d5a89d7d | 1802 | /* advance past the trailing '\0' that strpcpyl() guarantees */ |
912541b0 KS |
1803 | s++; |
1804 | l--; | |
1805 | } | |
1806 | udev_device->envp[i] = NULL; | |
1807 | udev_device->monitor_buf_len = s - udev_device->monitor_buf; | |
1808 | udev_device->envp_uptodate = true; | |
912541b0 | 1809 | return 0; |
6493e655 KS |
1810 | } |
1811 | ||
1812 | char **udev_device_get_properties_envp(struct udev_device *udev_device) | |
1813 | { | |
912541b0 KS |
1814 | if (!udev_device->envp_uptodate) |
1815 | if (update_envp_monitor_buf(udev_device) != 0) | |
1816 | return NULL; | |
1817 | return udev_device->envp; | |
6493e655 KS |
1818 | } |
1819 | ||
1820 | ssize_t udev_device_get_properties_monitor_buf(struct udev_device *udev_device, const char **buf) | |
1821 | { | |
912541b0 KS |
1822 | if (!udev_device->envp_uptodate) |
1823 | if (update_envp_monitor_buf(udev_device) != 0) | |
1824 | return -EINVAL; | |
1825 | *buf = udev_device->monitor_buf; | |
1826 | return udev_device->monitor_buf_len; | |
c2654402 KS |
1827 | } |
1828 | ||
8cd2e972 | 1829 | int udev_device_set_action(struct udev_device *udev_device, const char *action) |
c4f5f942 | 1830 | { |
912541b0 KS |
1831 | free(udev_device->action); |
1832 | udev_device->action = strdup(action); | |
1833 | if (udev_device->action == NULL) | |
1834 | return -ENOMEM; | |
1835 | udev_device_add_property(udev_device, "ACTION", udev_device->action); | |
1836 | return 0; | |
c4f5f942 KS |
1837 | } |
1838 | ||
8cd2e972 | 1839 | int udev_device_get_devlink_priority(struct udev_device *udev_device) |
6bd1c78a | 1840 | { |
912541b0 KS |
1841 | if (!udev_device->info_loaded) |
1842 | udev_device_read_db(udev_device, NULL); | |
1843 | return udev_device->devlink_priority; | |
6bd1c78a KS |
1844 | } |
1845 | ||
8cd2e972 | 1846 | int udev_device_set_devlink_priority(struct udev_device *udev_device, int prio) |
6bd1c78a | 1847 | { |
912541b0 KS |
1848 | udev_device->devlink_priority = prio; |
1849 | return 0; | |
6bd1c78a KS |
1850 | } |
1851 | ||
d7ce7539 SJR |
1852 | int udev_device_get_watch_handle(struct udev_device *udev_device) |
1853 | { | |
912541b0 KS |
1854 | if (!udev_device->info_loaded) |
1855 | udev_device_read_db(udev_device, NULL); | |
1856 | return udev_device->watch_handle; | |
d7ce7539 SJR |
1857 | } |
1858 | ||
1859 | int udev_device_set_watch_handle(struct udev_device *udev_device, int handle) | |
1860 | { | |
912541b0 KS |
1861 | udev_device->watch_handle = handle; |
1862 | return 0; | |
d7ce7539 | 1863 | } |
fc416258 | 1864 | |
9ead6627 KS |
1865 | bool udev_device_get_db_persist(struct udev_device *udev_device) |
1866 | { | |
912541b0 | 1867 | return udev_device->db_persist; |
9ead6627 KS |
1868 | } |
1869 | ||
1870 | void udev_device_set_db_persist(struct udev_device *udev_device) | |
1871 | { | |
912541b0 | 1872 | udev_device->db_persist = true; |
9ead6627 | 1873 | } |