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1 | /* | |
2 | * Copyright (C) 2004-2009 Kay Sievers <kay@vrfy.org> | |
3 | * | |
4 | * This program is free software: you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation, either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
16 | */ | |
17 | ||
18 | #include <stdlib.h> | |
19 | #include <string.h> | |
20 | #include <stdio.h> | |
21 | #include <stddef.h> | |
22 | #include <ctype.h> | |
23 | #include <stdarg.h> | |
24 | #include <unistd.h> | |
25 | #include <dirent.h> | |
26 | #include <errno.h> | |
27 | #include <getopt.h> | |
28 | #include <fcntl.h> | |
29 | #include <sys/stat.h> | |
30 | #include <sys/types.h> | |
31 | ||
32 | #include "udev.h" | |
33 | ||
34 | static bool skip_attribute(const char *name) | |
35 | { | |
36 | static const char* const skip[] = { | |
37 | "uevent", | |
38 | "dev", | |
39 | "modalias", | |
40 | "resource", | |
41 | "driver", | |
42 | "subsystem", | |
43 | "module", | |
44 | }; | |
45 | unsigned int i; | |
46 | ||
47 | for (i = 0; i < ELEMENTSOF(skip); i++) | |
48 | if (streq(name, skip[i])) | |
49 | return true; | |
50 | return false; | |
51 | } | |
52 | ||
53 | static void print_all_attributes(struct udev_device *device, const char *key) | |
54 | { | |
55 | struct udev_list_entry *sysattr; | |
56 | ||
57 | udev_list_entry_foreach(sysattr, udev_device_get_sysattr_list_entry(device)) { | |
58 | const char *name; | |
59 | const char *value; | |
60 | size_t len; | |
61 | ||
62 | name = udev_list_entry_get_name(sysattr); | |
63 | if (skip_attribute(name)) | |
64 | continue; | |
65 | ||
66 | value = udev_device_get_sysattr_value(device, name); | |
67 | if (value == NULL) | |
68 | continue; | |
69 | ||
70 | /* skip any values that look like a path */ | |
71 | if (value[0] == '/') | |
72 | continue; | |
73 | ||
74 | /* skip nonprintable attributes */ | |
75 | len = strlen(value); | |
76 | while (len > 0 && isprint(value[len-1])) | |
77 | len--; | |
78 | if (len > 0) | |
79 | continue; | |
80 | ||
81 | printf(" %s{%s}==\"%s\"\n", key, name, value); | |
82 | } | |
83 | printf("\n"); | |
84 | } | |
85 | ||
86 | static int print_device_chain(struct udev_device *device) | |
87 | { | |
88 | struct udev_device *device_parent; | |
89 | const char *str; | |
90 | ||
91 | printf("\n" | |
92 | "Udevadm info starts with the device specified by the devpath and then\n" | |
93 | "walks up the chain of parent devices. It prints for every device\n" | |
94 | "found, all possible attributes in the udev rules key format.\n" | |
95 | "A rule to match, can be composed by the attributes of the device\n" | |
96 | "and the attributes from one single parent device.\n" | |
97 | "\n"); | |
98 | ||
99 | printf(" looking at device '%s':\n", udev_device_get_devpath(device)); | |
100 | printf(" KERNEL==\"%s\"\n", udev_device_get_sysname(device)); | |
101 | str = udev_device_get_subsystem(device); | |
102 | if (str == NULL) | |
103 | str = ""; | |
104 | printf(" SUBSYSTEM==\"%s\"\n", str); | |
105 | str = udev_device_get_driver(device); | |
106 | if (str == NULL) | |
107 | str = ""; | |
108 | printf(" DRIVER==\"%s\"\n", str); | |
109 | print_all_attributes(device, "ATTR"); | |
110 | ||
111 | device_parent = device; | |
112 | do { | |
113 | device_parent = udev_device_get_parent(device_parent); | |
114 | if (device_parent == NULL) | |
115 | break; | |
116 | printf(" looking at parent device '%s':\n", udev_device_get_devpath(device_parent)); | |
117 | printf(" KERNELS==\"%s\"\n", udev_device_get_sysname(device_parent)); | |
118 | str = udev_device_get_subsystem(device_parent); | |
119 | if (str == NULL) | |
120 | str = ""; | |
121 | printf(" SUBSYSTEMS==\"%s\"\n", str); | |
122 | str = udev_device_get_driver(device_parent); | |
123 | if (str == NULL) | |
124 | str = ""; | |
125 | printf(" DRIVERS==\"%s\"\n", str); | |
126 | print_all_attributes(device_parent, "ATTRS"); | |
127 | } while (device_parent != NULL); | |
128 | ||
129 | return 0; | |
130 | } | |
131 | ||
132 | static void print_record(struct udev_device *device) | |
133 | { | |
134 | const char *str; | |
135 | int i; | |
136 | struct udev_list_entry *list_entry; | |
137 | ||
138 | printf("P: %s\n", udev_device_get_devpath(device)); | |
139 | ||
140 | str = udev_device_get_devnode(device); | |
141 | if (str != NULL) | |
142 | printf("N: %s\n", str + strlen("/dev/")); | |
143 | ||
144 | i = udev_device_get_devlink_priority(device); | |
145 | if (i != 0) | |
146 | printf("L: %i\n", i); | |
147 | ||
148 | udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(device)) | |
149 | printf("S: %s\n", udev_list_entry_get_name(list_entry) + strlen("/dev/")); | |
150 | ||
151 | udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(device)) | |
152 | printf("E: %s=%s\n", | |
153 | udev_list_entry_get_name(list_entry), | |
154 | udev_list_entry_get_value(list_entry)); | |
155 | printf("\n"); | |
156 | } | |
157 | ||
158 | static int stat_device(const char *name, bool export, const char *prefix) | |
159 | { | |
160 | struct stat statbuf; | |
161 | ||
162 | if (stat(name, &statbuf) != 0) | |
163 | return -1; | |
164 | ||
165 | if (export) { | |
166 | if (prefix == NULL) | |
167 | prefix = "INFO_"; | |
168 | printf("%sMAJOR=%d\n" | |
169 | "%sMINOR=%d\n", | |
170 | prefix, major(statbuf.st_dev), | |
171 | prefix, minor(statbuf.st_dev)); | |
172 | } else | |
173 | printf("%d:%d\n", major(statbuf.st_dev), minor(statbuf.st_dev)); | |
174 | return 0; | |
175 | } | |
176 | ||
177 | static int export_devices(struct udev *udev) | |
178 | { | |
179 | struct udev_enumerate *udev_enumerate; | |
180 | struct udev_list_entry *list_entry; | |
181 | ||
182 | udev_enumerate = udev_enumerate_new(udev); | |
183 | if (udev_enumerate == NULL) | |
184 | return -1; | |
185 | udev_enumerate_scan_devices(udev_enumerate); | |
186 | udev_list_entry_foreach(list_entry, udev_enumerate_get_list_entry(udev_enumerate)) { | |
187 | struct udev_device *device; | |
188 | ||
189 | device = udev_device_new_from_syspath(udev, udev_list_entry_get_name(list_entry)); | |
190 | if (device != NULL) { | |
191 | print_record(device); | |
192 | udev_device_unref(device); | |
193 | } | |
194 | } | |
195 | udev_enumerate_unref(udev_enumerate); | |
196 | return 0; | |
197 | } | |
198 | ||
199 | static void cleanup_dir(DIR *dir, mode_t mask, int depth) | |
200 | { | |
201 | struct dirent *dent; | |
202 | ||
203 | if (depth <= 0) | |
204 | return; | |
205 | ||
206 | for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) { | |
207 | struct stat stats; | |
208 | ||
209 | if (dent->d_name[0] == '.') | |
210 | continue; | |
211 | if (fstatat(dirfd(dir), dent->d_name, &stats, AT_SYMLINK_NOFOLLOW) != 0) | |
212 | continue; | |
213 | if ((stats.st_mode & mask) != 0) | |
214 | continue; | |
215 | if (S_ISDIR(stats.st_mode)) { | |
216 | DIR *dir2; | |
217 | ||
218 | dir2 = fdopendir(openat(dirfd(dir), dent->d_name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC)); | |
219 | if (dir2 != NULL) { | |
220 | cleanup_dir(dir2, mask, depth-1); | |
221 | closedir(dir2); | |
222 | } | |
223 | unlinkat(dirfd(dir), dent->d_name, AT_REMOVEDIR); | |
224 | } else { | |
225 | unlinkat(dirfd(dir), dent->d_name, 0); | |
226 | } | |
227 | } | |
228 | } | |
229 | ||
230 | static void cleanup_db(struct udev *udev) | |
231 | { | |
232 | DIR *dir; | |
233 | ||
234 | unlink("/run/udev/queue.bin"); | |
235 | ||
236 | dir = opendir("/run/udev/data"); | |
237 | if (dir != NULL) { | |
238 | cleanup_dir(dir, S_ISVTX, 1); | |
239 | closedir(dir); | |
240 | } | |
241 | ||
242 | dir = opendir("/run/udev/links"); | |
243 | if (dir != NULL) { | |
244 | cleanup_dir(dir, 0, 2); | |
245 | closedir(dir); | |
246 | } | |
247 | ||
248 | dir = opendir("/run/udev/tags"); | |
249 | if (dir != NULL) { | |
250 | cleanup_dir(dir, 0, 2); | |
251 | closedir(dir); | |
252 | } | |
253 | ||
254 | dir = opendir("/run/udev/static_node-tags"); | |
255 | if (dir != NULL) { | |
256 | cleanup_dir(dir, 0, 2); | |
257 | closedir(dir); | |
258 | } | |
259 | ||
260 | dir = opendir("/run/udev/watch"); | |
261 | if (dir != NULL) { | |
262 | cleanup_dir(dir, 0, 1); | |
263 | closedir(dir); | |
264 | } | |
265 | } | |
266 | ||
267 | static struct udev_device *find_device(struct udev *udev, const char *id, const char *prefix) | |
268 | { | |
269 | char name[UTIL_PATH_SIZE]; | |
270 | ||
271 | if (prefix && !startswith(id, prefix)) { | |
272 | strscpyl(name, sizeof(name), prefix, id, NULL); | |
273 | id = name; | |
274 | } | |
275 | ||
276 | if (startswith(id, "/dev/")) { | |
277 | struct stat statbuf; | |
278 | char type; | |
279 | ||
280 | if (stat(id, &statbuf) < 0) | |
281 | return NULL; | |
282 | ||
283 | if (S_ISBLK(statbuf.st_mode)) | |
284 | type = 'b'; | |
285 | else if (S_ISCHR(statbuf.st_mode)) | |
286 | type = 'c'; | |
287 | else | |
288 | return NULL; | |
289 | ||
290 | return udev_device_new_from_devnum(udev, type, statbuf.st_rdev); | |
291 | } else if (startswith(id, "/sys/")) | |
292 | return udev_device_new_from_syspath(udev, id); | |
293 | else | |
294 | return NULL; | |
295 | } | |
296 | ||
297 | static int uinfo(struct udev *udev, int argc, char *argv[]) | |
298 | { | |
299 | struct udev_device *device = NULL; | |
300 | bool root = 0; | |
301 | bool export = 0; | |
302 | const char *export_prefix = NULL; | |
303 | char name[UTIL_PATH_SIZE]; | |
304 | struct udev_list_entry *list_entry; | |
305 | int rc = 0, c; | |
306 | ||
307 | static const struct option options[] = { | |
308 | { "name", required_argument, NULL, 'n' }, | |
309 | { "path", required_argument, NULL, 'p' }, | |
310 | { "query", required_argument, NULL, 'q' }, | |
311 | { "attribute-walk", no_argument, NULL, 'a' }, | |
312 | { "cleanup-db", no_argument, NULL, 'c' }, | |
313 | { "export-db", no_argument, NULL, 'e' }, | |
314 | { "root", no_argument, NULL, 'r' }, | |
315 | { "device-id-of-file", required_argument, NULL, 'd' }, | |
316 | { "export", no_argument, NULL, 'x' }, | |
317 | { "export-prefix", required_argument, NULL, 'P' }, | |
318 | { "version", no_argument, NULL, 'V' }, | |
319 | { "help", no_argument, NULL, 'h' }, | |
320 | {} | |
321 | }; | |
322 | ||
323 | static const char *usage = | |
324 | "Usage: udevadm info [OPTIONS] [DEVPATH|FILE]\n" | |
325 | " -q,--query=TYPE query device information:\n" | |
326 | " name name of device node\n" | |
327 | " symlink pointing to node\n" | |
328 | " path sys device path\n" | |
329 | " property the device properties\n" | |
330 | " all all values\n" | |
331 | " -p,--path=SYSPATH sys device path used for query or attribute walk\n" | |
332 | " -n,--name=NAME node or symlink name used for query or attribute walk\n" | |
333 | " -r,--root prepend dev directory to path names\n" | |
334 | " -a,--attribute-walk print all key matches walking along the chain\n" | |
335 | " of parent devices\n" | |
336 | " -d,--device-id-of-file=FILE print major:minor of device containing this file\n" | |
337 | " -x,--export export key/value pairs\n" | |
338 | " -P,--export-prefix export the key name with a prefix\n" | |
339 | " -e,--export-db export the content of the udev database\n" | |
340 | " -c,--cleanup-db cleanup the udev database\n" | |
341 | " --version print version of the program\n" | |
342 | " -h,--help print this message\n"; | |
343 | ||
344 | enum action_type { | |
345 | ACTION_QUERY, | |
346 | ACTION_ATTRIBUTE_WALK, | |
347 | ACTION_DEVICE_ID_FILE, | |
348 | } action = ACTION_QUERY; | |
349 | ||
350 | enum query_type { | |
351 | QUERY_NAME, | |
352 | QUERY_PATH, | |
353 | QUERY_SYMLINK, | |
354 | QUERY_PROPERTY, | |
355 | QUERY_ALL, | |
356 | } query = QUERY_ALL; | |
357 | ||
358 | while ((c = getopt_long(argc, argv, "aced:n:p:q:rxP:RVh", options, NULL)) >= 0) | |
359 | switch (c) { | |
360 | case 'n': { | |
361 | if (device != NULL) { | |
362 | fprintf(stderr, "device already specified\n"); | |
363 | rc = 2; | |
364 | goto exit; | |
365 | } | |
366 | ||
367 | device = find_device(udev, optarg, "/dev/"); | |
368 | if (device == NULL) { | |
369 | fprintf(stderr, "device node not found\n"); | |
370 | rc = 2; | |
371 | goto exit; | |
372 | } | |
373 | break; | |
374 | } | |
375 | case 'p': | |
376 | if (device != NULL) { | |
377 | fprintf(stderr, "device already specified\n"); | |
378 | rc = 2; | |
379 | goto exit; | |
380 | } | |
381 | ||
382 | device = find_device(udev, optarg, "/sys"); | |
383 | if (device == NULL) { | |
384 | fprintf(stderr, "syspath not found\n"); | |
385 | rc = 2; | |
386 | goto exit; | |
387 | } | |
388 | break; | |
389 | case 'q': | |
390 | action = ACTION_QUERY; | |
391 | if (streq(optarg, "property") || streq(optarg, "env")) { | |
392 | query = QUERY_PROPERTY; | |
393 | } else if (streq(optarg, "name")) { | |
394 | query = QUERY_NAME; | |
395 | } else if (streq(optarg, "symlink")) { | |
396 | query = QUERY_SYMLINK; | |
397 | } else if (streq(optarg, "path")) { | |
398 | query = QUERY_PATH; | |
399 | } else if (streq(optarg, "all")) { | |
400 | query = QUERY_ALL; | |
401 | } else { | |
402 | fprintf(stderr, "unknown query type\n"); | |
403 | rc = 3; | |
404 | goto exit; | |
405 | } | |
406 | break; | |
407 | case 'r': | |
408 | root = true; | |
409 | break; | |
410 | case 'd': | |
411 | action = ACTION_DEVICE_ID_FILE; | |
412 | strscpy(name, sizeof(name), optarg); | |
413 | break; | |
414 | case 'a': | |
415 | action = ACTION_ATTRIBUTE_WALK; | |
416 | break; | |
417 | case 'e': | |
418 | export_devices(udev); | |
419 | goto exit; | |
420 | case 'c': | |
421 | cleanup_db(udev); | |
422 | goto exit; | |
423 | case 'x': | |
424 | export = true; | |
425 | break; | |
426 | case 'P': | |
427 | export_prefix = optarg; | |
428 | break; | |
429 | case 'V': | |
430 | printf("%s\n", VERSION); | |
431 | goto exit; | |
432 | case 'h': | |
433 | printf("%s\n", usage); | |
434 | goto exit; | |
435 | default: | |
436 | rc = 1; | |
437 | goto exit; | |
438 | } | |
439 | ||
440 | switch (action) { | |
441 | case ACTION_QUERY: | |
442 | if (!device) { | |
443 | if (!argv[optind]) { | |
444 | fprintf(stderr, "%s\n", usage); | |
445 | rc = 2; | |
446 | goto exit; | |
447 | } | |
448 | device = find_device(udev, argv[optind], NULL); | |
449 | if (!device) { | |
450 | fprintf(stderr, "Unknown device, --name=, --path=, or absolute path in /dev/ or /sys expected.\n"); | |
451 | rc = 4; | |
452 | goto exit; | |
453 | } | |
454 | } | |
455 | ||
456 | switch(query) { | |
457 | case QUERY_NAME: { | |
458 | const char *node = udev_device_get_devnode(device); | |
459 | ||
460 | if (node == NULL) { | |
461 | fprintf(stderr, "no device node found\n"); | |
462 | rc = 5; | |
463 | goto exit; | |
464 | } | |
465 | ||
466 | if (root) | |
467 | printf("%s\n", udev_device_get_devnode(device)); | |
468 | else | |
469 | printf("%s\n", udev_device_get_devnode(device) + strlen("/dev/")); | |
470 | break; | |
471 | } | |
472 | case QUERY_SYMLINK: | |
473 | list_entry = udev_device_get_devlinks_list_entry(device); | |
474 | while (list_entry != NULL) { | |
475 | if (root) | |
476 | printf("%s", udev_list_entry_get_name(list_entry)); | |
477 | else | |
478 | printf("%s", udev_list_entry_get_name(list_entry) + strlen("/dev/")); | |
479 | list_entry = udev_list_entry_get_next(list_entry); | |
480 | if (list_entry != NULL) | |
481 | printf(" "); | |
482 | } | |
483 | printf("\n"); | |
484 | break; | |
485 | case QUERY_PATH: | |
486 | printf("%s\n", udev_device_get_devpath(device)); | |
487 | goto exit; | |
488 | case QUERY_PROPERTY: | |
489 | list_entry = udev_device_get_properties_list_entry(device); | |
490 | while (list_entry != NULL) { | |
491 | if (export) { | |
492 | const char *prefix = export_prefix; | |
493 | ||
494 | if (prefix == NULL) | |
495 | prefix = ""; | |
496 | printf("%s%s='%s'\n", prefix, | |
497 | udev_list_entry_get_name(list_entry), | |
498 | udev_list_entry_get_value(list_entry)); | |
499 | } else { | |
500 | printf("%s=%s\n", udev_list_entry_get_name(list_entry), udev_list_entry_get_value(list_entry)); | |
501 | } | |
502 | list_entry = udev_list_entry_get_next(list_entry); | |
503 | } | |
504 | break; | |
505 | case QUERY_ALL: | |
506 | print_record(device); | |
507 | break; | |
508 | default: | |
509 | fprintf(stderr, "unknown query type\n"); | |
510 | break; | |
511 | } | |
512 | break; | |
513 | case ACTION_ATTRIBUTE_WALK: | |
514 | if (!device && argv[optind]) { | |
515 | device = find_device(udev, argv[optind], NULL); | |
516 | if (!device) { | |
517 | fprintf(stderr, "Unknown device, absolute path in /dev/ or /sys expected.\n"); | |
518 | rc = 4; | |
519 | goto exit; | |
520 | } | |
521 | } | |
522 | if (!device) { | |
523 | fprintf(stderr, "Unknown device, --name=, --path=, or absolute path in /dev/ or /sys expected.\n"); | |
524 | rc = 4; | |
525 | goto exit; | |
526 | } | |
527 | print_device_chain(device); | |
528 | break; | |
529 | case ACTION_DEVICE_ID_FILE: | |
530 | if (stat_device(name, export, export_prefix) != 0) | |
531 | rc = 1; | |
532 | break; | |
533 | } | |
534 | ||
535 | exit: | |
536 | udev_device_unref(device); | |
537 | return rc; | |
538 | } | |
539 | ||
540 | const struct udevadm_cmd udevadm_info = { | |
541 | .name = "info", | |
542 | .cmd = uinfo, | |
543 | .help = "query sysfs or the udev database", | |
544 | }; |