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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
96df036f TG |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2008-2012 Kay Sievers <kay@vrfy.org> | |
6 | Copyright 2014-2015 Tom Gundersen <teg@jklm.no> | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
96df036f TG |
22 | #include "sd-device.h" |
23 | ||
b5efdb8a | 24 | #include "alloc-util.h" |
96df036f | 25 | #include "device-enumerator-private.h" |
07630cea | 26 | #include "device-util.h" |
a0956174 | 27 | #include "dirent-util.h" |
3ffd4af2 | 28 | #include "fd-util.h" |
07630cea LP |
29 | #include "prioq.h" |
30 | #include "set.h" | |
31 | #include "string-util.h" | |
32 | #include "strv.h" | |
33 | #include "util.h" | |
96df036f TG |
34 | |
35 | #define DEVICE_ENUMERATE_MAX_DEPTH 256 | |
36 | ||
37 | typedef enum DeviceEnumerationType { | |
38 | DEVICE_ENUMERATION_TYPE_DEVICES, | |
39 | DEVICE_ENUMERATION_TYPE_SUBSYSTEMS, | |
40 | _DEVICE_ENUMERATION_TYPE_MAX, | |
41 | _DEVICE_ENUMERATION_TYPE_INVALID = -1, | |
42 | } DeviceEnumerationType; | |
43 | ||
44 | struct sd_device_enumerator { | |
45 | unsigned n_ref; | |
46 | ||
47 | DeviceEnumerationType type; | |
48 | Prioq *devices; | |
49 | bool scan_uptodate; | |
50 | ||
51 | Set *match_subsystem; | |
52 | Set *nomatch_subsystem; | |
53 | Hashmap *match_sysattr; | |
54 | Hashmap *nomatch_sysattr; | |
55 | Hashmap *match_property; | |
56 | Set *match_sysname; | |
57 | Set *match_tag; | |
58 | sd_device *match_parent; | |
dee5e0b6 | 59 | bool match_allow_uninitialized; |
96df036f TG |
60 | }; |
61 | ||
62 | _public_ int sd_device_enumerator_new(sd_device_enumerator **ret) { | |
4afd3348 | 63 | _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *enumerator = NULL; |
96df036f TG |
64 | |
65 | assert(ret); | |
66 | ||
67 | enumerator = new0(sd_device_enumerator, 1); | |
68 | if (!enumerator) | |
69 | return -ENOMEM; | |
70 | ||
71 | enumerator->n_ref = 1; | |
72 | enumerator->type = _DEVICE_ENUMERATION_TYPE_INVALID; | |
73 | ||
1cc6c93a | 74 | *ret = TAKE_PTR(enumerator); |
96df036f TG |
75 | |
76 | return 0; | |
77 | } | |
78 | ||
79 | _public_ sd_device_enumerator *sd_device_enumerator_ref(sd_device_enumerator *enumerator) { | |
80 | assert_return(enumerator, NULL); | |
81 | ||
82 | assert_se((++ enumerator->n_ref) >= 2); | |
83 | ||
84 | return enumerator; | |
85 | } | |
86 | ||
87 | _public_ sd_device_enumerator *sd_device_enumerator_unref(sd_device_enumerator *enumerator) { | |
88 | if (enumerator && (-- enumerator->n_ref) == 0) { | |
89 | sd_device *device; | |
90 | ||
91 | while ((device = prioq_pop(enumerator->devices))) | |
92 | sd_device_unref(device); | |
93 | ||
94 | prioq_free(enumerator->devices); | |
95 | ||
96 | set_free_free(enumerator->match_subsystem); | |
97 | set_free_free(enumerator->nomatch_subsystem); | |
98 | hashmap_free_free_free(enumerator->match_sysattr); | |
99 | hashmap_free_free_free(enumerator->nomatch_sysattr); | |
100 | hashmap_free_free_free(enumerator->match_property); | |
101 | set_free_free(enumerator->match_sysname); | |
102 | set_free_free(enumerator->match_tag); | |
103 | sd_device_unref(enumerator->match_parent); | |
104 | ||
105 | free(enumerator); | |
106 | } | |
107 | ||
108 | return NULL; | |
109 | } | |
110 | ||
111 | _public_ int sd_device_enumerator_add_match_subsystem(sd_device_enumerator *enumerator, const char *subsystem, int match) { | |
112 | Set **set; | |
113 | int r; | |
114 | ||
115 | assert_return(enumerator, -EINVAL); | |
116 | assert_return(subsystem, -EINVAL); | |
117 | ||
118 | if (match) | |
119 | set = &enumerator->match_subsystem; | |
120 | else | |
121 | set = &enumerator->nomatch_subsystem; | |
122 | ||
123 | r = set_ensure_allocated(set, NULL); | |
124 | if (r < 0) | |
125 | return r; | |
126 | ||
127 | r = set_put_strdup(*set, subsystem); | |
128 | if (r < 0) | |
129 | return r; | |
130 | ||
131 | enumerator->scan_uptodate = false; | |
132 | ||
133 | return 0; | |
134 | } | |
135 | ||
136 | _public_ int sd_device_enumerator_add_match_sysattr(sd_device_enumerator *enumerator, const char *_sysattr, const char *_value, int match) { | |
137 | _cleanup_free_ char *sysattr = NULL, *value = NULL; | |
138 | Hashmap **hashmap; | |
139 | int r; | |
140 | ||
141 | assert_return(enumerator, -EINVAL); | |
142 | assert_return(_sysattr, -EINVAL); | |
96df036f TG |
143 | |
144 | if (match) | |
145 | hashmap = &enumerator->match_sysattr; | |
146 | else | |
147 | hashmap = &enumerator->nomatch_sysattr; | |
148 | ||
149 | r = hashmap_ensure_allocated(hashmap, NULL); | |
150 | if (r < 0) | |
151 | return r; | |
152 | ||
153 | sysattr = strdup(_sysattr); | |
154 | if (!sysattr) | |
155 | return -ENOMEM; | |
156 | ||
54f0b4d9 TG |
157 | if (_value) { |
158 | value = strdup(_value); | |
159 | if (!value) | |
160 | return -ENOMEM; | |
161 | } | |
96df036f TG |
162 | |
163 | r = hashmap_put(*hashmap, sysattr, value); | |
164 | if (r < 0) | |
165 | return r; | |
166 | ||
167 | sysattr = NULL; | |
168 | value = NULL; | |
169 | ||
170 | enumerator->scan_uptodate = false; | |
171 | ||
172 | return 0; | |
173 | } | |
174 | ||
175 | _public_ int sd_device_enumerator_add_match_property(sd_device_enumerator *enumerator, const char *_property, const char *_value) { | |
176 | _cleanup_free_ char *property = NULL, *value = NULL; | |
177 | int r; | |
178 | ||
179 | assert_return(enumerator, -EINVAL); | |
180 | assert_return(_property, -EINVAL); | |
96df036f TG |
181 | |
182 | r = hashmap_ensure_allocated(&enumerator->match_property, NULL); | |
183 | if (r < 0) | |
184 | return r; | |
185 | ||
186 | property = strdup(_property); | |
187 | if (!property) | |
188 | return -ENOMEM; | |
189 | ||
54f0b4d9 TG |
190 | if (_value) { |
191 | value = strdup(_value); | |
192 | if (!value) | |
193 | return -ENOMEM; | |
194 | } | |
96df036f TG |
195 | |
196 | r = hashmap_put(enumerator->match_property, property, value); | |
197 | if (r < 0) | |
198 | return r; | |
199 | ||
200 | property = NULL; | |
201 | value = NULL; | |
202 | ||
203 | enumerator->scan_uptodate = false; | |
204 | ||
205 | return 0; | |
206 | } | |
207 | ||
208 | _public_ int sd_device_enumerator_add_match_sysname(sd_device_enumerator *enumerator, const char *sysname) { | |
209 | int r; | |
210 | ||
211 | assert_return(enumerator, -EINVAL); | |
212 | assert_return(sysname, -EINVAL); | |
213 | ||
214 | r = set_ensure_allocated(&enumerator->match_sysname, NULL); | |
215 | if (r < 0) | |
216 | return r; | |
217 | ||
218 | r = set_put_strdup(enumerator->match_sysname, sysname); | |
219 | if (r < 0) | |
220 | return r; | |
221 | ||
222 | enumerator->scan_uptodate = false; | |
223 | ||
224 | return 0; | |
225 | } | |
226 | ||
227 | _public_ int sd_device_enumerator_add_match_tag(sd_device_enumerator *enumerator, const char *tag) { | |
228 | int r; | |
229 | ||
230 | assert_return(enumerator, -EINVAL); | |
231 | assert_return(tag, -EINVAL); | |
232 | ||
233 | r = set_ensure_allocated(&enumerator->match_tag, NULL); | |
234 | if (r < 0) | |
235 | return r; | |
236 | ||
237 | r = set_put_strdup(enumerator->match_tag, tag); | |
238 | if (r < 0) | |
239 | return r; | |
240 | ||
241 | enumerator->scan_uptodate = false; | |
242 | ||
243 | return 0; | |
244 | } | |
245 | ||
246 | _public_ int sd_device_enumerator_add_match_parent(sd_device_enumerator *enumerator, sd_device *parent) { | |
247 | assert_return(enumerator, -EINVAL); | |
248 | assert_return(parent, -EINVAL); | |
249 | ||
250 | sd_device_unref(enumerator->match_parent); | |
251 | enumerator->match_parent = sd_device_ref(parent); | |
252 | ||
253 | enumerator->scan_uptodate = false; | |
254 | ||
255 | return 0; | |
256 | } | |
257 | ||
dee5e0b6 | 258 | _public_ int sd_device_enumerator_allow_uninitialized(sd_device_enumerator *enumerator) { |
96df036f TG |
259 | assert_return(enumerator, -EINVAL); |
260 | ||
dee5e0b6 TG |
261 | enumerator->match_allow_uninitialized = true; |
262 | ||
263 | enumerator->scan_uptodate = false; | |
264 | ||
265 | return 0; | |
266 | } | |
267 | ||
268 | int device_enumerator_add_match_is_initialized(sd_device_enumerator *enumerator) { | |
269 | assert_return(enumerator, -EINVAL); | |
270 | ||
271 | enumerator->match_allow_uninitialized = false; | |
96df036f TG |
272 | |
273 | enumerator->scan_uptodate = false; | |
274 | ||
275 | return 0; | |
276 | } | |
277 | ||
278 | static int device_compare(const void *_a, const void *_b) { | |
279 | sd_device *a = (sd_device *)_a, *b = (sd_device *)_b; | |
280 | const char *devpath_a, *devpath_b, *sound_a; | |
18ae3d98 | 281 | bool delay_a, delay_b; |
96df036f TG |
282 | |
283 | assert_se(sd_device_get_devpath(a, &devpath_a) >= 0); | |
284 | assert_se(sd_device_get_devpath(b, &devpath_b) >= 0); | |
285 | ||
286 | sound_a = strstr(devpath_a, "/sound/card"); | |
287 | if (sound_a) { | |
288 | /* For sound cards the control device must be enumerated last to | |
289 | * make sure it's the final device node that gets ACLs applied. | |
290 | * Applications rely on this fact and use ACL changes on the | |
291 | * control node as an indicator that the ACL change of the | |
292 | * entire sound card completed. The kernel makes this guarantee | |
293 | * when creating those devices, and hence we should too when | |
294 | * enumerating them. */ | |
fbd0b64f | 295 | sound_a += STRLEN("/sound/card"); |
96df036f TG |
296 | sound_a = strchr(sound_a, '/'); |
297 | ||
298 | if (sound_a) { | |
299 | unsigned prefix_len; | |
300 | ||
301 | prefix_len = sound_a - devpath_a; | |
302 | ||
303 | if (strncmp(devpath_a, devpath_b, prefix_len) == 0) { | |
304 | const char *sound_b; | |
305 | ||
306 | sound_b = devpath_b + prefix_len; | |
307 | ||
308 | if (startswith(sound_a, "/controlC") && | |
309 | !startswith(sound_b, "/contolC")) | |
310 | return 1; | |
311 | ||
312 | if (!startswith(sound_a, "/controlC") && | |
313 | startswith(sound_b, "/controlC")) | |
314 | return -1; | |
315 | } | |
316 | } | |
317 | } | |
318 | ||
319 | /* md and dm devices are enumerated after all other devices */ | |
18ae3d98 DH |
320 | delay_a = strstr(devpath_a, "/block/md") || strstr(devpath_a, "/block/dm-"); |
321 | delay_b = strstr(devpath_b, "/block/md") || strstr(devpath_b, "/block/dm-"); | |
322 | if (delay_a != delay_b) | |
323 | return delay_a - delay_b; | |
96df036f TG |
324 | |
325 | return strcmp(devpath_a, devpath_b); | |
326 | } | |
327 | ||
19c9df44 | 328 | int device_enumerator_add_device(sd_device_enumerator *enumerator, sd_device *device) { |
96df036f TG |
329 | int r; |
330 | ||
331 | assert_return(enumerator, -EINVAL); | |
332 | assert_return(device, -EINVAL); | |
333 | ||
334 | r = prioq_ensure_allocated(&enumerator->devices, device_compare); | |
335 | if (r < 0) | |
336 | return r; | |
337 | ||
338 | r = prioq_put(enumerator->devices, device, NULL); | |
339 | if (r < 0) | |
340 | return r; | |
341 | ||
342 | sd_device_ref(device); | |
343 | ||
344 | return 0; | |
345 | } | |
346 | ||
347 | static bool match_sysattr_value(sd_device *device, const char *sysattr, const char *match_value) { | |
348 | const char *value; | |
349 | int r; | |
350 | ||
351 | assert(device); | |
352 | assert(sysattr); | |
353 | ||
354 | r = sd_device_get_sysattr_value(device, sysattr, &value); | |
355 | if (r < 0) | |
356 | return false; | |
357 | ||
358 | if (!match_value) | |
359 | return true; | |
360 | ||
361 | if (fnmatch(match_value, value, 0) == 0) | |
362 | return true; | |
363 | ||
364 | return false; | |
365 | } | |
366 | ||
367 | static bool match_sysattr(sd_device_enumerator *enumerator, sd_device *device) { | |
368 | const char *sysattr; | |
369 | const char *value; | |
370 | Iterator i; | |
371 | ||
372 | assert(enumerator); | |
373 | assert(device); | |
374 | ||
5f529f4c | 375 | HASHMAP_FOREACH_KEY(value, sysattr, enumerator->nomatch_sysattr, i) |
96df036f TG |
376 | if (match_sysattr_value(device, sysattr, value)) |
377 | return false; | |
378 | ||
5f529f4c | 379 | HASHMAP_FOREACH_KEY(value, sysattr, enumerator->match_sysattr, i) |
96df036f TG |
380 | if (!match_sysattr_value(device, sysattr, value)) |
381 | return false; | |
382 | ||
383 | return true; | |
384 | } | |
385 | ||
386 | static bool match_property(sd_device_enumerator *enumerator, sd_device *device) { | |
387 | const char *property; | |
388 | const char *value; | |
389 | Iterator i; | |
390 | ||
391 | assert(enumerator); | |
392 | assert(device); | |
393 | ||
394 | if (hashmap_isempty(enumerator->match_property)) | |
395 | return true; | |
396 | ||
5f529f4c | 397 | HASHMAP_FOREACH_KEY(value, property, enumerator->match_property, i) { |
96df036f TG |
398 | const char *property_dev, *value_dev; |
399 | ||
400 | FOREACH_DEVICE_PROPERTY(device, property_dev, value_dev) { | |
401 | if (fnmatch(property, property_dev, 0) != 0) | |
402 | continue; | |
403 | ||
404 | if (!value && !value_dev) | |
405 | return true; | |
406 | ||
407 | if (!value || !value_dev) | |
408 | continue; | |
409 | ||
410 | if (fnmatch(value, value_dev, 0) == 0) | |
411 | return true; | |
412 | } | |
413 | } | |
414 | ||
415 | return false; | |
416 | } | |
417 | ||
418 | static bool match_tag(sd_device_enumerator *enumerator, sd_device *device) { | |
419 | const char *tag; | |
420 | Iterator i; | |
421 | ||
422 | assert(enumerator); | |
423 | assert(device); | |
424 | ||
425 | SET_FOREACH(tag, enumerator->match_tag, i) | |
426 | if (!sd_device_has_tag(device, tag)) | |
427 | return false; | |
428 | ||
429 | return true; | |
430 | } | |
431 | ||
432 | static bool match_parent(sd_device_enumerator *enumerator, sd_device *device) { | |
433 | const char *devpath, *devpath_dev; | |
434 | int r; | |
435 | ||
436 | assert(enumerator); | |
437 | assert(device); | |
438 | ||
439 | if (!enumerator->match_parent) | |
440 | return true; | |
441 | ||
442 | r = sd_device_get_devpath(enumerator->match_parent, &devpath); | |
443 | assert(r >= 0); | |
444 | ||
445 | r = sd_device_get_devpath(device, &devpath_dev); | |
446 | assert(r >= 0); | |
447 | ||
448 | return startswith(devpath_dev, devpath); | |
449 | } | |
450 | ||
451 | static bool match_sysname(sd_device_enumerator *enumerator, const char *sysname) { | |
452 | const char *sysname_match; | |
453 | Iterator i; | |
454 | ||
455 | assert(enumerator); | |
456 | assert(sysname); | |
457 | ||
458 | if (set_isempty(enumerator->match_sysname)) | |
459 | return true; | |
460 | ||
461 | SET_FOREACH(sysname_match, enumerator->match_sysname, i) | |
462 | if (fnmatch(sysname_match, sysname, 0) == 0) | |
463 | return true; | |
464 | ||
465 | return false; | |
466 | } | |
467 | ||
468 | static int enumerator_scan_dir_and_add_devices(sd_device_enumerator *enumerator, const char *basedir, const char *subdir1, const char *subdir2) { | |
469 | _cleanup_closedir_ DIR *dir = NULL; | |
470 | char *path; | |
471 | struct dirent *dent; | |
472 | int r = 0; | |
473 | ||
474 | assert(enumerator); | |
475 | assert(basedir); | |
476 | ||
477 | path = strjoina("/sys/", basedir, "/"); | |
478 | ||
479 | if (subdir1) | |
480 | path = strjoina(path, subdir1, "/"); | |
481 | ||
482 | if (subdir2) | |
483 | path = strjoina(path, subdir2, "/"); | |
484 | ||
485 | dir = opendir(path); | |
486 | if (!dir) | |
487 | return -errno; | |
488 | ||
489 | FOREACH_DIRENT_ALL(dent, dir, return -errno) { | |
4afd3348 | 490 | _cleanup_(sd_device_unrefp) sd_device *device = NULL; |
96df036f TG |
491 | char syspath[strlen(path) + 1 + strlen(dent->d_name) + 1]; |
492 | dev_t devnum; | |
493 | int ifindex, initialized, k; | |
494 | ||
495 | if (dent->d_name[0] == '.') | |
496 | continue; | |
497 | ||
498 | if (!match_sysname(enumerator, dent->d_name)) | |
499 | continue; | |
500 | ||
501 | (void)sprintf(syspath, "%s%s", path, dent->d_name); | |
502 | ||
503 | k = sd_device_new_from_syspath(&device, syspath); | |
504 | if (k < 0) { | |
08232a02 TG |
505 | if (k != -ENODEV) |
506 | /* this is necessarily racey, so ignore missing devices */ | |
507 | r = k; | |
508 | ||
96df036f TG |
509 | continue; |
510 | } | |
511 | ||
512 | k = sd_device_get_devnum(device, &devnum); | |
513 | if (k < 0) { | |
514 | r = k; | |
515 | continue; | |
516 | } | |
517 | ||
518 | k = sd_device_get_ifindex(device, &ifindex); | |
519 | if (k < 0) { | |
520 | r = k; | |
521 | continue; | |
522 | } | |
523 | ||
524 | k = sd_device_get_is_initialized(device, &initialized); | |
525 | if (k < 0) { | |
526 | r = k; | |
527 | continue; | |
528 | } | |
529 | ||
530 | /* | |
531 | * All devices with a device node or network interfaces | |
532 | * possibly need udev to adjust the device node permission | |
533 | * or context, or rename the interface before it can be | |
534 | * reliably used from other processes. | |
535 | * | |
536 | * For now, we can only check these types of devices, we | |
537 | * might not store a database, and have no way to find out | |
538 | * for all other types of devices. | |
539 | */ | |
dee5e0b6 | 540 | if (!enumerator->match_allow_uninitialized && |
96df036f TG |
541 | !initialized && |
542 | (major(devnum) > 0 || ifindex > 0)) | |
543 | continue; | |
544 | ||
545 | if (!match_parent(enumerator, device)) | |
546 | continue; | |
547 | ||
548 | if (!match_tag(enumerator, device)) | |
549 | continue; | |
550 | ||
551 | if (!match_property(enumerator, device)) | |
552 | continue; | |
553 | ||
554 | if (!match_sysattr(enumerator, device)) | |
555 | continue; | |
556 | ||
19c9df44 | 557 | k = device_enumerator_add_device(enumerator, device); |
96df036f TG |
558 | if (k < 0) |
559 | r = k; | |
560 | } | |
561 | ||
562 | return r; | |
563 | } | |
564 | ||
565 | static bool match_subsystem(sd_device_enumerator *enumerator, const char *subsystem) { | |
566 | const char *subsystem_match; | |
567 | Iterator i; | |
568 | ||
569 | assert(enumerator); | |
570 | ||
571 | if (!subsystem) | |
572 | return false; | |
573 | ||
574 | SET_FOREACH(subsystem_match, enumerator->nomatch_subsystem, i) | |
575 | if (fnmatch(subsystem_match, subsystem, 0) == 0) | |
576 | return false; | |
577 | ||
578 | if (set_isempty(enumerator->match_subsystem)) | |
579 | return true; | |
580 | ||
581 | SET_FOREACH(subsystem_match, enumerator->match_subsystem, i) | |
582 | if (fnmatch(subsystem_match, subsystem, 0) == 0) | |
583 | return true; | |
584 | ||
585 | return false; | |
586 | } | |
587 | ||
588 | static int enumerator_scan_dir(sd_device_enumerator *enumerator, const char *basedir, const char *subdir, const char *subsystem) { | |
589 | _cleanup_closedir_ DIR *dir = NULL; | |
590 | char *path; | |
591 | struct dirent *dent; | |
592 | int r = 0; | |
593 | ||
594 | path = strjoina("/sys/", basedir); | |
595 | ||
596 | dir = opendir(path); | |
597 | if (!dir) | |
598 | return -errno; | |
599 | ||
600 | log_debug(" device-enumerator: scanning %s", path); | |
601 | ||
602 | FOREACH_DIRENT_ALL(dent, dir, return -errno) { | |
603 | int k; | |
604 | ||
605 | if (dent->d_name[0] == '.') | |
606 | continue; | |
607 | ||
608 | if (!match_subsystem(enumerator, subsystem ? : dent->d_name)) | |
609 | continue; | |
610 | ||
611 | k = enumerator_scan_dir_and_add_devices(enumerator, basedir, dent->d_name, subdir); | |
612 | if (k < 0) | |
613 | r = k; | |
614 | } | |
615 | ||
616 | return r; | |
617 | } | |
618 | ||
619 | static int enumerator_scan_devices_tag(sd_device_enumerator *enumerator, const char *tag) { | |
620 | _cleanup_closedir_ DIR *dir = NULL; | |
621 | char *path; | |
622 | struct dirent *dent; | |
623 | int r = 0; | |
624 | ||
625 | assert(enumerator); | |
626 | assert(tag); | |
627 | ||
628 | path = strjoina("/run/udev/tags/", tag); | |
629 | ||
630 | dir = opendir(path); | |
631 | if (!dir) { | |
632 | if (errno == ENOENT) | |
633 | return 0; | |
25f027c5 ZJS |
634 | else |
635 | return log_error_errno(errno, "sd-device-enumerator: could not open tags directory %s: %m", path); | |
96df036f TG |
636 | } |
637 | ||
638 | /* TODO: filter away subsystems? */ | |
639 | ||
640 | FOREACH_DIRENT_ALL(dent, dir, return -errno) { | |
4afd3348 | 641 | _cleanup_(sd_device_unrefp) sd_device *device = NULL; |
96df036f TG |
642 | const char *subsystem, *sysname; |
643 | int k; | |
644 | ||
645 | if (dent->d_name[0] == '.') | |
646 | continue; | |
647 | ||
648 | k = sd_device_new_from_device_id(&device, dent->d_name); | |
649 | if (k < 0) { | |
08232a02 TG |
650 | if (k != -ENODEV) |
651 | /* this is necessarily racy, so ignore missing devices */ | |
652 | r = k; | |
653 | ||
96df036f TG |
654 | continue; |
655 | } | |
656 | ||
657 | k = sd_device_get_subsystem(device, &subsystem); | |
658 | if (k < 0) { | |
659 | r = k; | |
660 | continue; | |
661 | } | |
662 | ||
663 | if (!match_subsystem(enumerator, subsystem)) | |
664 | continue; | |
665 | ||
666 | k = sd_device_get_sysname(device, &sysname); | |
667 | if (k < 0) { | |
668 | r = k; | |
669 | continue; | |
670 | } | |
671 | ||
672 | if (!match_sysname(enumerator, sysname)) | |
673 | continue; | |
674 | ||
675 | if (!match_parent(enumerator, device)) | |
676 | continue; | |
677 | ||
678 | if (!match_property(enumerator, device)) | |
679 | continue; | |
680 | ||
681 | if (!match_sysattr(enumerator, device)) | |
682 | continue; | |
683 | ||
19c9df44 | 684 | k = device_enumerator_add_device(enumerator, device); |
96df036f TG |
685 | if (k < 0) { |
686 | r = k; | |
687 | continue; | |
688 | } | |
689 | } | |
690 | ||
691 | return r; | |
692 | } | |
693 | ||
694 | static int enumerator_scan_devices_tags(sd_device_enumerator *enumerator) { | |
695 | const char *tag; | |
696 | Iterator i; | |
3172836b | 697 | int r = 0; |
96df036f TG |
698 | |
699 | assert(enumerator); | |
700 | ||
701 | SET_FOREACH(tag, enumerator->match_tag, i) { | |
3172836b TG |
702 | int k; |
703 | ||
704 | k = enumerator_scan_devices_tag(enumerator, tag); | |
705 | if (k < 0) | |
706 | r = k; | |
96df036f TG |
707 | } |
708 | ||
3172836b | 709 | return r; |
96df036f TG |
710 | } |
711 | ||
712 | static int parent_add_child(sd_device_enumerator *enumerator, const char *path) { | |
4afd3348 | 713 | _cleanup_(sd_device_unrefp) sd_device *device = NULL; |
96df036f TG |
714 | const char *subsystem, *sysname; |
715 | int r; | |
716 | ||
717 | r = sd_device_new_from_syspath(&device, path); | |
08232a02 TG |
718 | if (r == -ENODEV) |
719 | /* this is necessarily racy, so ignore missing devices */ | |
96df036f TG |
720 | return 0; |
721 | else if (r < 0) | |
722 | return r; | |
723 | ||
724 | r = sd_device_get_subsystem(device, &subsystem); | |
9a9c7dc2 MM |
725 | if (r == -ENOENT) |
726 | return 0; | |
96df036f TG |
727 | if (r < 0) |
728 | return r; | |
729 | ||
730 | if (!match_subsystem(enumerator, subsystem)) | |
731 | return 0; | |
732 | ||
733 | r = sd_device_get_sysname(device, &sysname); | |
734 | if (r < 0) | |
735 | return r; | |
736 | ||
737 | if (!match_sysname(enumerator, sysname)) | |
738 | return 0; | |
739 | ||
740 | if (!match_property(enumerator, device)) | |
741 | return 0; | |
742 | ||
743 | if (!match_sysattr(enumerator, device)) | |
744 | return 0; | |
745 | ||
19c9df44 | 746 | r = device_enumerator_add_device(enumerator, device); |
96df036f TG |
747 | if (r < 0) |
748 | return r; | |
749 | ||
750 | return 1; | |
751 | } | |
752 | ||
753 | static int parent_crawl_children(sd_device_enumerator *enumerator, const char *path, unsigned maxdepth) { | |
754 | _cleanup_closedir_ DIR *dir = NULL; | |
755 | struct dirent *dent; | |
756 | int r = 0; | |
757 | ||
758 | dir = opendir(path); | |
25f027c5 ZJS |
759 | if (!dir) |
760 | return log_debug_errno(errno, "sd-device-enumerate: could not open parent directory %s: %m", path); | |
96df036f TG |
761 | |
762 | FOREACH_DIRENT_ALL(dent, dir, return -errno) { | |
763 | _cleanup_free_ char *child = NULL; | |
764 | int k; | |
765 | ||
766 | if (dent->d_name[0] == '.') | |
767 | continue; | |
768 | ||
769 | if (dent->d_type != DT_DIR) | |
770 | continue; | |
771 | ||
605405c6 | 772 | child = strjoin(path, "/", dent->d_name); |
53fae771 ZJS |
773 | if (!child) |
774 | return -ENOMEM; | |
96df036f TG |
775 | |
776 | k = parent_add_child(enumerator, child); | |
777 | if (k < 0) | |
778 | r = k; | |
779 | ||
780 | if (maxdepth > 0) | |
781 | parent_crawl_children(enumerator, child, maxdepth - 1); | |
782 | else | |
783 | log_debug("device-enumerate: max depth reached, %s: ignoring devices", child); | |
784 | } | |
785 | ||
786 | return r; | |
787 | } | |
788 | ||
789 | static int enumerator_scan_devices_children(sd_device_enumerator *enumerator) { | |
790 | const char *path; | |
791 | int r = 0, k; | |
792 | ||
793 | r = sd_device_get_syspath(enumerator->match_parent, &path); | |
794 | if (r < 0) | |
795 | return r; | |
796 | ||
797 | k = parent_add_child(enumerator, path); | |
798 | if (k < 0) | |
799 | r = k; | |
800 | ||
801 | k = parent_crawl_children(enumerator, path, DEVICE_ENUMERATE_MAX_DEPTH); | |
802 | if (k < 0) | |
803 | r = k; | |
804 | ||
805 | return r; | |
806 | } | |
807 | ||
808 | static int enumerator_scan_devices_all(sd_device_enumerator *enumerator) { | |
809 | int r = 0; | |
810 | ||
811 | log_debug("device-enumerator: scan all dirs"); | |
812 | ||
813 | if (access("/sys/subsystem", F_OK) >= 0) { | |
814 | /* we have /subsystem/, forget all the old stuff */ | |
815 | r = enumerator_scan_dir(enumerator, "subsystem", "devices", NULL); | |
e53fc357 LP |
816 | if (r < 0) |
817 | return log_debug_errno(r, "device-enumerator: failed to scan /sys/subsystem: %m"); | |
96df036f TG |
818 | } else { |
819 | int k; | |
820 | ||
821 | k = enumerator_scan_dir(enumerator, "bus", "devices", NULL); | |
822 | if (k < 0) { | |
823 | log_debug_errno(k, "device-enumerator: failed to scan /sys/bus: %m"); | |
824 | r = k; | |
825 | } | |
826 | ||
827 | k = enumerator_scan_dir(enumerator, "class", NULL, NULL); | |
828 | if (k < 0) { | |
829 | log_debug_errno(k, "device-enumerator: failed to scan /sys/class: %m"); | |
830 | r = k; | |
831 | } | |
832 | } | |
833 | ||
834 | return r; | |
835 | } | |
836 | ||
837 | int device_enumerator_scan_devices(sd_device_enumerator *enumerator) { | |
838 | sd_device *device; | |
3172836b | 839 | int r = 0, k; |
96df036f TG |
840 | |
841 | assert(enumerator); | |
842 | ||
843 | if (enumerator->scan_uptodate && | |
844 | enumerator->type == DEVICE_ENUMERATION_TYPE_DEVICES) | |
845 | return 0; | |
846 | ||
847 | while ((device = prioq_pop(enumerator->devices))) | |
848 | sd_device_unref(device); | |
849 | ||
850 | if (!set_isempty(enumerator->match_tag)) { | |
3172836b TG |
851 | k = enumerator_scan_devices_tags(enumerator); |
852 | if (k < 0) | |
853 | r = k; | |
96df036f | 854 | } else if (enumerator->match_parent) { |
3172836b TG |
855 | k = enumerator_scan_devices_children(enumerator); |
856 | if (k < 0) | |
857 | r = k; | |
96df036f | 858 | } else { |
3172836b TG |
859 | k = enumerator_scan_devices_all(enumerator); |
860 | if (k < 0) | |
861 | r = k; | |
96df036f TG |
862 | } |
863 | ||
864 | enumerator->scan_uptodate = true; | |
865 | ||
3172836b | 866 | return r; |
96df036f TG |
867 | } |
868 | ||
869 | _public_ sd_device *sd_device_enumerator_get_device_first(sd_device_enumerator *enumerator) { | |
870 | int r; | |
871 | ||
872 | assert_return(enumerator, NULL); | |
873 | ||
874 | r = device_enumerator_scan_devices(enumerator); | |
875 | if (r < 0) | |
876 | return NULL; | |
877 | ||
878 | enumerator->type = DEVICE_ENUMERATION_TYPE_DEVICES; | |
879 | ||
880 | return prioq_peek(enumerator->devices); | |
881 | } | |
882 | ||
883 | _public_ sd_device *sd_device_enumerator_get_device_next(sd_device_enumerator *enumerator) { | |
884 | assert_return(enumerator, NULL); | |
885 | ||
886 | if (!enumerator->scan_uptodate || | |
887 | enumerator->type != DEVICE_ENUMERATION_TYPE_DEVICES) | |
888 | return NULL; | |
889 | ||
890 | sd_device_unref(prioq_pop(enumerator->devices)); | |
891 | ||
892 | return prioq_peek(enumerator->devices); | |
893 | } | |
894 | ||
895 | int device_enumerator_scan_subsystems(sd_device_enumerator *enumerator) { | |
896 | sd_device *device; | |
897 | const char *subsysdir; | |
898 | int r = 0, k; | |
899 | ||
900 | assert(enumerator); | |
901 | ||
902 | if (enumerator->scan_uptodate && | |
903 | enumerator->type == DEVICE_ENUMERATION_TYPE_SUBSYSTEMS) | |
904 | return 0; | |
905 | ||
906 | while ((device = prioq_pop(enumerator->devices))) | |
907 | sd_device_unref(device); | |
908 | ||
909 | /* modules */ | |
910 | if (match_subsystem(enumerator, "module")) { | |
911 | k = enumerator_scan_dir_and_add_devices(enumerator, "module", NULL, NULL); | |
912 | if (k < 0) { | |
913 | log_debug_errno(k, "device-enumerator: failed to scan modules: %m"); | |
914 | r = k; | |
915 | } | |
916 | } | |
917 | ||
918 | if (access("/sys/subsystem", F_OK) >= 0) | |
919 | subsysdir = "subsystem"; | |
920 | else | |
921 | subsysdir = "bus"; | |
922 | ||
923 | /* subsystems (only buses support coldplug) */ | |
924 | if (match_subsystem(enumerator, "subsystem")) { | |
925 | k = enumerator_scan_dir_and_add_devices(enumerator, subsysdir, NULL, NULL); | |
926 | if (k < 0) { | |
927 | log_debug_errno(k, "device-enumerator: failed to scan subsystems: %m"); | |
928 | r = k; | |
929 | } | |
930 | } | |
931 | ||
932 | /* subsystem drivers */ | |
933 | if (match_subsystem(enumerator, "drivers")) { | |
934 | k = enumerator_scan_dir(enumerator, subsysdir, "drivers", "drivers"); | |
935 | if (k < 0) { | |
936 | log_debug_errno(k, "device-enumerator: failed to scan drivers: %m"); | |
937 | r = k; | |
938 | } | |
939 | } | |
940 | ||
941 | enumerator->scan_uptodate = true; | |
942 | ||
943 | return r; | |
944 | } | |
945 | ||
946 | _public_ sd_device *sd_device_enumerator_get_subsystem_first(sd_device_enumerator *enumerator) { | |
947 | int r; | |
948 | ||
949 | assert_return(enumerator, NULL); | |
950 | ||
951 | r = device_enumerator_scan_subsystems(enumerator); | |
952 | if (r < 0) | |
953 | return NULL; | |
954 | ||
955 | enumerator->type = DEVICE_ENUMERATION_TYPE_SUBSYSTEMS; | |
956 | ||
957 | return prioq_peek(enumerator->devices); | |
958 | } | |
959 | ||
960 | _public_ sd_device *sd_device_enumerator_get_subsystem_next(sd_device_enumerator *enumerator) { | |
961 | assert_return(enumerator, NULL); | |
962 | ||
963 | if (enumerator->scan_uptodate || | |
964 | enumerator->type != DEVICE_ENUMERATION_TYPE_SUBSYSTEMS) | |
965 | return NULL; | |
966 | ||
967 | sd_device_unref(prioq_pop(enumerator->devices)); | |
968 | ||
969 | return prioq_peek(enumerator->devices); | |
970 | } | |
971 | ||
972 | sd_device *device_enumerator_get_first(sd_device_enumerator *enumerator) { | |
973 | assert_return(enumerator, NULL); | |
974 | ||
975 | return prioq_peek(enumerator->devices); | |
976 | } | |
977 | ||
978 | sd_device *device_enumerator_get_next(sd_device_enumerator *enumerator) { | |
979 | assert_return(enumerator, NULL); | |
980 | ||
981 | sd_device_unref(prioq_pop(enumerator->devices)); | |
982 | ||
983 | return prioq_peek(enumerator->devices); | |
984 | } |