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96df036f TG |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2008-2012 Kay Sievers <kay@vrfy.org> | |
5 | Copyright 2014-2015 Tom Gundersen <teg@jklm.no> | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU Lesser General Public License as published by | |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public License | |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
19 | ***/ | |
20 | ||
96df036f TG |
21 | #include "sd-device.h" |
22 | ||
96df036f | 23 | #include "device-enumerator-private.h" |
07630cea | 24 | #include "device-util.h" |
a0956174 | 25 | #include "dirent-util.h" |
3ffd4af2 | 26 | #include "fd-util.h" |
07630cea LP |
27 | #include "prioq.h" |
28 | #include "set.h" | |
29 | #include "string-util.h" | |
30 | #include "strv.h" | |
31 | #include "util.h" | |
96df036f TG |
32 | |
33 | #define DEVICE_ENUMERATE_MAX_DEPTH 256 | |
34 | ||
35 | typedef enum DeviceEnumerationType { | |
36 | DEVICE_ENUMERATION_TYPE_DEVICES, | |
37 | DEVICE_ENUMERATION_TYPE_SUBSYSTEMS, | |
38 | _DEVICE_ENUMERATION_TYPE_MAX, | |
39 | _DEVICE_ENUMERATION_TYPE_INVALID = -1, | |
40 | } DeviceEnumerationType; | |
41 | ||
42 | struct sd_device_enumerator { | |
43 | unsigned n_ref; | |
44 | ||
45 | DeviceEnumerationType type; | |
46 | Prioq *devices; | |
47 | bool scan_uptodate; | |
48 | ||
49 | Set *match_subsystem; | |
50 | Set *nomatch_subsystem; | |
51 | Hashmap *match_sysattr; | |
52 | Hashmap *nomatch_sysattr; | |
53 | Hashmap *match_property; | |
54 | Set *match_sysname; | |
55 | Set *match_tag; | |
56 | sd_device *match_parent; | |
dee5e0b6 | 57 | bool match_allow_uninitialized; |
96df036f TG |
58 | }; |
59 | ||
60 | _public_ int sd_device_enumerator_new(sd_device_enumerator **ret) { | |
61 | _cleanup_device_enumerator_unref_ sd_device_enumerator *enumerator = NULL; | |
62 | ||
63 | assert(ret); | |
64 | ||
65 | enumerator = new0(sd_device_enumerator, 1); | |
66 | if (!enumerator) | |
67 | return -ENOMEM; | |
68 | ||
69 | enumerator->n_ref = 1; | |
70 | enumerator->type = _DEVICE_ENUMERATION_TYPE_INVALID; | |
71 | ||
72 | *ret = enumerator; | |
73 | enumerator = NULL; | |
74 | ||
75 | return 0; | |
76 | } | |
77 | ||
78 | _public_ sd_device_enumerator *sd_device_enumerator_ref(sd_device_enumerator *enumerator) { | |
79 | assert_return(enumerator, NULL); | |
80 | ||
81 | assert_se((++ enumerator->n_ref) >= 2); | |
82 | ||
83 | return enumerator; | |
84 | } | |
85 | ||
86 | _public_ sd_device_enumerator *sd_device_enumerator_unref(sd_device_enumerator *enumerator) { | |
87 | if (enumerator && (-- enumerator->n_ref) == 0) { | |
88 | sd_device *device; | |
89 | ||
90 | while ((device = prioq_pop(enumerator->devices))) | |
91 | sd_device_unref(device); | |
92 | ||
93 | prioq_free(enumerator->devices); | |
94 | ||
95 | set_free_free(enumerator->match_subsystem); | |
96 | set_free_free(enumerator->nomatch_subsystem); | |
97 | hashmap_free_free_free(enumerator->match_sysattr); | |
98 | hashmap_free_free_free(enumerator->nomatch_sysattr); | |
99 | hashmap_free_free_free(enumerator->match_property); | |
100 | set_free_free(enumerator->match_sysname); | |
101 | set_free_free(enumerator->match_tag); | |
102 | sd_device_unref(enumerator->match_parent); | |
103 | ||
104 | free(enumerator); | |
105 | } | |
106 | ||
107 | return NULL; | |
108 | } | |
109 | ||
110 | _public_ int sd_device_enumerator_add_match_subsystem(sd_device_enumerator *enumerator, const char *subsystem, int match) { | |
111 | Set **set; | |
112 | int r; | |
113 | ||
114 | assert_return(enumerator, -EINVAL); | |
115 | assert_return(subsystem, -EINVAL); | |
116 | ||
117 | if (match) | |
118 | set = &enumerator->match_subsystem; | |
119 | else | |
120 | set = &enumerator->nomatch_subsystem; | |
121 | ||
122 | r = set_ensure_allocated(set, NULL); | |
123 | if (r < 0) | |
124 | return r; | |
125 | ||
126 | r = set_put_strdup(*set, subsystem); | |
127 | if (r < 0) | |
128 | return r; | |
129 | ||
130 | enumerator->scan_uptodate = false; | |
131 | ||
132 | return 0; | |
133 | } | |
134 | ||
135 | _public_ int sd_device_enumerator_add_match_sysattr(sd_device_enumerator *enumerator, const char *_sysattr, const char *_value, int match) { | |
136 | _cleanup_free_ char *sysattr = NULL, *value = NULL; | |
137 | Hashmap **hashmap; | |
138 | int r; | |
139 | ||
140 | assert_return(enumerator, -EINVAL); | |
141 | assert_return(_sysattr, -EINVAL); | |
96df036f TG |
142 | |
143 | if (match) | |
144 | hashmap = &enumerator->match_sysattr; | |
145 | else | |
146 | hashmap = &enumerator->nomatch_sysattr; | |
147 | ||
148 | r = hashmap_ensure_allocated(hashmap, NULL); | |
149 | if (r < 0) | |
150 | return r; | |
151 | ||
152 | sysattr = strdup(_sysattr); | |
153 | if (!sysattr) | |
154 | return -ENOMEM; | |
155 | ||
54f0b4d9 TG |
156 | if (_value) { |
157 | value = strdup(_value); | |
158 | if (!value) | |
159 | return -ENOMEM; | |
160 | } | |
96df036f TG |
161 | |
162 | r = hashmap_put(*hashmap, sysattr, value); | |
163 | if (r < 0) | |
164 | return r; | |
165 | ||
166 | sysattr = NULL; | |
167 | value = NULL; | |
168 | ||
169 | enumerator->scan_uptodate = false; | |
170 | ||
171 | return 0; | |
172 | } | |
173 | ||
174 | _public_ int sd_device_enumerator_add_match_property(sd_device_enumerator *enumerator, const char *_property, const char *_value) { | |
175 | _cleanup_free_ char *property = NULL, *value = NULL; | |
176 | int r; | |
177 | ||
178 | assert_return(enumerator, -EINVAL); | |
179 | assert_return(_property, -EINVAL); | |
96df036f TG |
180 | |
181 | r = hashmap_ensure_allocated(&enumerator->match_property, NULL); | |
182 | if (r < 0) | |
183 | return r; | |
184 | ||
185 | property = strdup(_property); | |
186 | if (!property) | |
187 | return -ENOMEM; | |
188 | ||
54f0b4d9 TG |
189 | if (_value) { |
190 | value = strdup(_value); | |
191 | if (!value) | |
192 | return -ENOMEM; | |
193 | } | |
96df036f TG |
194 | |
195 | r = hashmap_put(enumerator->match_property, property, value); | |
196 | if (r < 0) | |
197 | return r; | |
198 | ||
199 | property = NULL; | |
200 | value = NULL; | |
201 | ||
202 | enumerator->scan_uptodate = false; | |
203 | ||
204 | return 0; | |
205 | } | |
206 | ||
207 | _public_ int sd_device_enumerator_add_match_sysname(sd_device_enumerator *enumerator, const char *sysname) { | |
208 | int r; | |
209 | ||
210 | assert_return(enumerator, -EINVAL); | |
211 | assert_return(sysname, -EINVAL); | |
212 | ||
213 | r = set_ensure_allocated(&enumerator->match_sysname, NULL); | |
214 | if (r < 0) | |
215 | return r; | |
216 | ||
217 | r = set_put_strdup(enumerator->match_sysname, sysname); | |
218 | if (r < 0) | |
219 | return r; | |
220 | ||
221 | enumerator->scan_uptodate = false; | |
222 | ||
223 | return 0; | |
224 | } | |
225 | ||
226 | _public_ int sd_device_enumerator_add_match_tag(sd_device_enumerator *enumerator, const char *tag) { | |
227 | int r; | |
228 | ||
229 | assert_return(enumerator, -EINVAL); | |
230 | assert_return(tag, -EINVAL); | |
231 | ||
232 | r = set_ensure_allocated(&enumerator->match_tag, NULL); | |
233 | if (r < 0) | |
234 | return r; | |
235 | ||
236 | r = set_put_strdup(enumerator->match_tag, tag); | |
237 | if (r < 0) | |
238 | return r; | |
239 | ||
240 | enumerator->scan_uptodate = false; | |
241 | ||
242 | return 0; | |
243 | } | |
244 | ||
245 | _public_ int sd_device_enumerator_add_match_parent(sd_device_enumerator *enumerator, sd_device *parent) { | |
246 | assert_return(enumerator, -EINVAL); | |
247 | assert_return(parent, -EINVAL); | |
248 | ||
249 | sd_device_unref(enumerator->match_parent); | |
250 | enumerator->match_parent = sd_device_ref(parent); | |
251 | ||
252 | enumerator->scan_uptodate = false; | |
253 | ||
254 | return 0; | |
255 | } | |
256 | ||
dee5e0b6 | 257 | _public_ int sd_device_enumerator_allow_uninitialized(sd_device_enumerator *enumerator) { |
96df036f TG |
258 | assert_return(enumerator, -EINVAL); |
259 | ||
dee5e0b6 TG |
260 | enumerator->match_allow_uninitialized = true; |
261 | ||
262 | enumerator->scan_uptodate = false; | |
263 | ||
264 | return 0; | |
265 | } | |
266 | ||
267 | int device_enumerator_add_match_is_initialized(sd_device_enumerator *enumerator) { | |
268 | assert_return(enumerator, -EINVAL); | |
269 | ||
270 | enumerator->match_allow_uninitialized = false; | |
96df036f TG |
271 | |
272 | enumerator->scan_uptodate = false; | |
273 | ||
274 | return 0; | |
275 | } | |
276 | ||
277 | static int device_compare(const void *_a, const void *_b) { | |
278 | sd_device *a = (sd_device *)_a, *b = (sd_device *)_b; | |
279 | const char *devpath_a, *devpath_b, *sound_a; | |
18ae3d98 | 280 | bool delay_a, delay_b; |
96df036f TG |
281 | |
282 | assert_se(sd_device_get_devpath(a, &devpath_a) >= 0); | |
283 | assert_se(sd_device_get_devpath(b, &devpath_b) >= 0); | |
284 | ||
285 | sound_a = strstr(devpath_a, "/sound/card"); | |
286 | if (sound_a) { | |
287 | /* For sound cards the control device must be enumerated last to | |
288 | * make sure it's the final device node that gets ACLs applied. | |
289 | * Applications rely on this fact and use ACL changes on the | |
290 | * control node as an indicator that the ACL change of the | |
291 | * entire sound card completed. The kernel makes this guarantee | |
292 | * when creating those devices, and hence we should too when | |
293 | * enumerating them. */ | |
294 | sound_a += strlen("/sound/card"); | |
295 | sound_a = strchr(sound_a, '/'); | |
296 | ||
297 | if (sound_a) { | |
298 | unsigned prefix_len; | |
299 | ||
300 | prefix_len = sound_a - devpath_a; | |
301 | ||
302 | if (strncmp(devpath_a, devpath_b, prefix_len) == 0) { | |
303 | const char *sound_b; | |
304 | ||
305 | sound_b = devpath_b + prefix_len; | |
306 | ||
307 | if (startswith(sound_a, "/controlC") && | |
308 | !startswith(sound_b, "/contolC")) | |
309 | return 1; | |
310 | ||
311 | if (!startswith(sound_a, "/controlC") && | |
312 | startswith(sound_b, "/controlC")) | |
313 | return -1; | |
314 | } | |
315 | } | |
316 | } | |
317 | ||
318 | /* md and dm devices are enumerated after all other devices */ | |
18ae3d98 DH |
319 | delay_a = strstr(devpath_a, "/block/md") || strstr(devpath_a, "/block/dm-"); |
320 | delay_b = strstr(devpath_b, "/block/md") || strstr(devpath_b, "/block/dm-"); | |
321 | if (delay_a != delay_b) | |
322 | return delay_a - delay_b; | |
96df036f TG |
323 | |
324 | return strcmp(devpath_a, devpath_b); | |
325 | } | |
326 | ||
19c9df44 | 327 | int device_enumerator_add_device(sd_device_enumerator *enumerator, sd_device *device) { |
96df036f TG |
328 | int r; |
329 | ||
330 | assert_return(enumerator, -EINVAL); | |
331 | assert_return(device, -EINVAL); | |
332 | ||
333 | r = prioq_ensure_allocated(&enumerator->devices, device_compare); | |
334 | if (r < 0) | |
335 | return r; | |
336 | ||
337 | r = prioq_put(enumerator->devices, device, NULL); | |
338 | if (r < 0) | |
339 | return r; | |
340 | ||
341 | sd_device_ref(device); | |
342 | ||
343 | return 0; | |
344 | } | |
345 | ||
346 | static bool match_sysattr_value(sd_device *device, const char *sysattr, const char *match_value) { | |
347 | const char *value; | |
348 | int r; | |
349 | ||
350 | assert(device); | |
351 | assert(sysattr); | |
352 | ||
353 | r = sd_device_get_sysattr_value(device, sysattr, &value); | |
354 | if (r < 0) | |
355 | return false; | |
356 | ||
357 | if (!match_value) | |
358 | return true; | |
359 | ||
360 | if (fnmatch(match_value, value, 0) == 0) | |
361 | return true; | |
362 | ||
363 | return false; | |
364 | } | |
365 | ||
366 | static bool match_sysattr(sd_device_enumerator *enumerator, sd_device *device) { | |
367 | const char *sysattr; | |
368 | const char *value; | |
369 | Iterator i; | |
370 | ||
371 | assert(enumerator); | |
372 | assert(device); | |
373 | ||
5f529f4c | 374 | HASHMAP_FOREACH_KEY(value, sysattr, enumerator->nomatch_sysattr, i) |
96df036f TG |
375 | if (match_sysattr_value(device, sysattr, value)) |
376 | return false; | |
377 | ||
5f529f4c | 378 | HASHMAP_FOREACH_KEY(value, sysattr, enumerator->match_sysattr, i) |
96df036f TG |
379 | if (!match_sysattr_value(device, sysattr, value)) |
380 | return false; | |
381 | ||
382 | return true; | |
383 | } | |
384 | ||
385 | static bool match_property(sd_device_enumerator *enumerator, sd_device *device) { | |
386 | const char *property; | |
387 | const char *value; | |
388 | Iterator i; | |
389 | ||
390 | assert(enumerator); | |
391 | assert(device); | |
392 | ||
393 | if (hashmap_isempty(enumerator->match_property)) | |
394 | return true; | |
395 | ||
5f529f4c | 396 | HASHMAP_FOREACH_KEY(value, property, enumerator->match_property, i) { |
96df036f TG |
397 | const char *property_dev, *value_dev; |
398 | ||
399 | FOREACH_DEVICE_PROPERTY(device, property_dev, value_dev) { | |
400 | if (fnmatch(property, property_dev, 0) != 0) | |
401 | continue; | |
402 | ||
403 | if (!value && !value_dev) | |
404 | return true; | |
405 | ||
406 | if (!value || !value_dev) | |
407 | continue; | |
408 | ||
409 | if (fnmatch(value, value_dev, 0) == 0) | |
410 | return true; | |
411 | } | |
412 | } | |
413 | ||
414 | return false; | |
415 | } | |
416 | ||
417 | static bool match_tag(sd_device_enumerator *enumerator, sd_device *device) { | |
418 | const char *tag; | |
419 | Iterator i; | |
420 | ||
421 | assert(enumerator); | |
422 | assert(device); | |
423 | ||
424 | SET_FOREACH(tag, enumerator->match_tag, i) | |
425 | if (!sd_device_has_tag(device, tag)) | |
426 | return false; | |
427 | ||
428 | return true; | |
429 | } | |
430 | ||
431 | static bool match_parent(sd_device_enumerator *enumerator, sd_device *device) { | |
432 | const char *devpath, *devpath_dev; | |
433 | int r; | |
434 | ||
435 | assert(enumerator); | |
436 | assert(device); | |
437 | ||
438 | if (!enumerator->match_parent) | |
439 | return true; | |
440 | ||
441 | r = sd_device_get_devpath(enumerator->match_parent, &devpath); | |
442 | assert(r >= 0); | |
443 | ||
444 | r = sd_device_get_devpath(device, &devpath_dev); | |
445 | assert(r >= 0); | |
446 | ||
447 | return startswith(devpath_dev, devpath); | |
448 | } | |
449 | ||
450 | static bool match_sysname(sd_device_enumerator *enumerator, const char *sysname) { | |
451 | const char *sysname_match; | |
452 | Iterator i; | |
453 | ||
454 | assert(enumerator); | |
455 | assert(sysname); | |
456 | ||
457 | if (set_isempty(enumerator->match_sysname)) | |
458 | return true; | |
459 | ||
460 | SET_FOREACH(sysname_match, enumerator->match_sysname, i) | |
461 | if (fnmatch(sysname_match, sysname, 0) == 0) | |
462 | return true; | |
463 | ||
464 | return false; | |
465 | } | |
466 | ||
467 | static int enumerator_scan_dir_and_add_devices(sd_device_enumerator *enumerator, const char *basedir, const char *subdir1, const char *subdir2) { | |
468 | _cleanup_closedir_ DIR *dir = NULL; | |
469 | char *path; | |
470 | struct dirent *dent; | |
471 | int r = 0; | |
472 | ||
473 | assert(enumerator); | |
474 | assert(basedir); | |
475 | ||
476 | path = strjoina("/sys/", basedir, "/"); | |
477 | ||
478 | if (subdir1) | |
479 | path = strjoina(path, subdir1, "/"); | |
480 | ||
481 | if (subdir2) | |
482 | path = strjoina(path, subdir2, "/"); | |
483 | ||
484 | dir = opendir(path); | |
485 | if (!dir) | |
486 | return -errno; | |
487 | ||
488 | FOREACH_DIRENT_ALL(dent, dir, return -errno) { | |
489 | _cleanup_device_unref_ sd_device *device = NULL; | |
490 | char syspath[strlen(path) + 1 + strlen(dent->d_name) + 1]; | |
491 | dev_t devnum; | |
492 | int ifindex, initialized, k; | |
493 | ||
494 | if (dent->d_name[0] == '.') | |
495 | continue; | |
496 | ||
497 | if (!match_sysname(enumerator, dent->d_name)) | |
498 | continue; | |
499 | ||
500 | (void)sprintf(syspath, "%s%s", path, dent->d_name); | |
501 | ||
502 | k = sd_device_new_from_syspath(&device, syspath); | |
503 | if (k < 0) { | |
08232a02 TG |
504 | if (k != -ENODEV) |
505 | /* this is necessarily racey, so ignore missing devices */ | |
506 | r = k; | |
507 | ||
96df036f TG |
508 | continue; |
509 | } | |
510 | ||
511 | k = sd_device_get_devnum(device, &devnum); | |
512 | if (k < 0) { | |
513 | r = k; | |
514 | continue; | |
515 | } | |
516 | ||
517 | k = sd_device_get_ifindex(device, &ifindex); | |
518 | if (k < 0) { | |
519 | r = k; | |
520 | continue; | |
521 | } | |
522 | ||
523 | k = sd_device_get_is_initialized(device, &initialized); | |
524 | if (k < 0) { | |
525 | r = k; | |
526 | continue; | |
527 | } | |
528 | ||
529 | /* | |
530 | * All devices with a device node or network interfaces | |
531 | * possibly need udev to adjust the device node permission | |
532 | * or context, or rename the interface before it can be | |
533 | * reliably used from other processes. | |
534 | * | |
535 | * For now, we can only check these types of devices, we | |
536 | * might not store a database, and have no way to find out | |
537 | * for all other types of devices. | |
538 | */ | |
dee5e0b6 | 539 | if (!enumerator->match_allow_uninitialized && |
96df036f TG |
540 | !initialized && |
541 | (major(devnum) > 0 || ifindex > 0)) | |
542 | continue; | |
543 | ||
544 | if (!match_parent(enumerator, device)) | |
545 | continue; | |
546 | ||
547 | if (!match_tag(enumerator, device)) | |
548 | continue; | |
549 | ||
550 | if (!match_property(enumerator, device)) | |
551 | continue; | |
552 | ||
553 | if (!match_sysattr(enumerator, device)) | |
554 | continue; | |
555 | ||
19c9df44 | 556 | k = device_enumerator_add_device(enumerator, device); |
96df036f TG |
557 | if (k < 0) |
558 | r = k; | |
559 | } | |
560 | ||
561 | return r; | |
562 | } | |
563 | ||
564 | static bool match_subsystem(sd_device_enumerator *enumerator, const char *subsystem) { | |
565 | const char *subsystem_match; | |
566 | Iterator i; | |
567 | ||
568 | assert(enumerator); | |
569 | ||
570 | if (!subsystem) | |
571 | return false; | |
572 | ||
573 | SET_FOREACH(subsystem_match, enumerator->nomatch_subsystem, i) | |
574 | if (fnmatch(subsystem_match, subsystem, 0) == 0) | |
575 | return false; | |
576 | ||
577 | if (set_isempty(enumerator->match_subsystem)) | |
578 | return true; | |
579 | ||
580 | SET_FOREACH(subsystem_match, enumerator->match_subsystem, i) | |
581 | if (fnmatch(subsystem_match, subsystem, 0) == 0) | |
582 | return true; | |
583 | ||
584 | return false; | |
585 | } | |
586 | ||
587 | static int enumerator_scan_dir(sd_device_enumerator *enumerator, const char *basedir, const char *subdir, const char *subsystem) { | |
588 | _cleanup_closedir_ DIR *dir = NULL; | |
589 | char *path; | |
590 | struct dirent *dent; | |
591 | int r = 0; | |
592 | ||
593 | path = strjoina("/sys/", basedir); | |
594 | ||
595 | dir = opendir(path); | |
596 | if (!dir) | |
597 | return -errno; | |
598 | ||
599 | log_debug(" device-enumerator: scanning %s", path); | |
600 | ||
601 | FOREACH_DIRENT_ALL(dent, dir, return -errno) { | |
602 | int k; | |
603 | ||
604 | if (dent->d_name[0] == '.') | |
605 | continue; | |
606 | ||
607 | if (!match_subsystem(enumerator, subsystem ? : dent->d_name)) | |
608 | continue; | |
609 | ||
610 | k = enumerator_scan_dir_and_add_devices(enumerator, basedir, dent->d_name, subdir); | |
611 | if (k < 0) | |
612 | r = k; | |
613 | } | |
614 | ||
615 | return r; | |
616 | } | |
617 | ||
618 | static int enumerator_scan_devices_tag(sd_device_enumerator *enumerator, const char *tag) { | |
619 | _cleanup_closedir_ DIR *dir = NULL; | |
620 | char *path; | |
621 | struct dirent *dent; | |
622 | int r = 0; | |
623 | ||
624 | assert(enumerator); | |
625 | assert(tag); | |
626 | ||
627 | path = strjoina("/run/udev/tags/", tag); | |
628 | ||
629 | dir = opendir(path); | |
630 | if (!dir) { | |
631 | if (errno == ENOENT) | |
632 | return 0; | |
633 | else { | |
634 | log_error("sd-device-enumerator: could not open tags directory %s: %m", path); | |
635 | return -errno; | |
636 | } | |
637 | } | |
638 | ||
639 | /* TODO: filter away subsystems? */ | |
640 | ||
641 | FOREACH_DIRENT_ALL(dent, dir, return -errno) { | |
642 | _cleanup_device_unref_ sd_device *device = NULL; | |
643 | const char *subsystem, *sysname; | |
644 | int k; | |
645 | ||
646 | if (dent->d_name[0] == '.') | |
647 | continue; | |
648 | ||
649 | k = sd_device_new_from_device_id(&device, dent->d_name); | |
650 | if (k < 0) { | |
08232a02 TG |
651 | if (k != -ENODEV) |
652 | /* this is necessarily racy, so ignore missing devices */ | |
653 | r = k; | |
654 | ||
96df036f TG |
655 | continue; |
656 | } | |
657 | ||
658 | k = sd_device_get_subsystem(device, &subsystem); | |
659 | if (k < 0) { | |
660 | r = k; | |
661 | continue; | |
662 | } | |
663 | ||
664 | if (!match_subsystem(enumerator, subsystem)) | |
665 | continue; | |
666 | ||
667 | k = sd_device_get_sysname(device, &sysname); | |
668 | if (k < 0) { | |
669 | r = k; | |
670 | continue; | |
671 | } | |
672 | ||
673 | if (!match_sysname(enumerator, sysname)) | |
674 | continue; | |
675 | ||
676 | if (!match_parent(enumerator, device)) | |
677 | continue; | |
678 | ||
679 | if (!match_property(enumerator, device)) | |
680 | continue; | |
681 | ||
682 | if (!match_sysattr(enumerator, device)) | |
683 | continue; | |
684 | ||
19c9df44 | 685 | k = device_enumerator_add_device(enumerator, device); |
96df036f TG |
686 | if (k < 0) { |
687 | r = k; | |
688 | continue; | |
689 | } | |
690 | } | |
691 | ||
692 | return r; | |
693 | } | |
694 | ||
695 | static int enumerator_scan_devices_tags(sd_device_enumerator *enumerator) { | |
696 | const char *tag; | |
697 | Iterator i; | |
698 | int r; | |
699 | ||
700 | assert(enumerator); | |
701 | ||
702 | SET_FOREACH(tag, enumerator->match_tag, i) { | |
703 | r = enumerator_scan_devices_tag(enumerator, tag); | |
704 | if (r < 0) | |
705 | return r; | |
706 | } | |
707 | ||
708 | return 0; | |
709 | } | |
710 | ||
711 | static int parent_add_child(sd_device_enumerator *enumerator, const char *path) { | |
712 | _cleanup_device_unref_ sd_device *device = NULL; | |
713 | const char *subsystem, *sysname; | |
714 | int r; | |
715 | ||
716 | r = sd_device_new_from_syspath(&device, path); | |
08232a02 TG |
717 | if (r == -ENODEV) |
718 | /* this is necessarily racy, so ignore missing devices */ | |
96df036f TG |
719 | return 0; |
720 | else if (r < 0) | |
721 | return r; | |
722 | ||
723 | r = sd_device_get_subsystem(device, &subsystem); | |
9a9c7dc2 MM |
724 | if (r == -ENOENT) |
725 | return 0; | |
96df036f TG |
726 | if (r < 0) |
727 | return r; | |
728 | ||
729 | if (!match_subsystem(enumerator, subsystem)) | |
730 | return 0; | |
731 | ||
732 | r = sd_device_get_sysname(device, &sysname); | |
733 | if (r < 0) | |
734 | return r; | |
735 | ||
736 | if (!match_sysname(enumerator, sysname)) | |
737 | return 0; | |
738 | ||
739 | if (!match_property(enumerator, device)) | |
740 | return 0; | |
741 | ||
742 | if (!match_sysattr(enumerator, device)) | |
743 | return 0; | |
744 | ||
19c9df44 | 745 | r = device_enumerator_add_device(enumerator, device); |
96df036f TG |
746 | if (r < 0) |
747 | return r; | |
748 | ||
749 | return 1; | |
750 | } | |
751 | ||
752 | static int parent_crawl_children(sd_device_enumerator *enumerator, const char *path, unsigned maxdepth) { | |
753 | _cleanup_closedir_ DIR *dir = NULL; | |
754 | struct dirent *dent; | |
755 | int r = 0; | |
756 | ||
757 | dir = opendir(path); | |
758 | if (!dir) { | |
759 | log_debug("sd-device-enumerate: could not open parent directory %s: %m", path); | |
760 | return -errno; | |
761 | } | |
762 | ||
763 | FOREACH_DIRENT_ALL(dent, dir, return -errno) { | |
764 | _cleanup_free_ char *child = NULL; | |
765 | int k; | |
766 | ||
767 | if (dent->d_name[0] == '.') | |
768 | continue; | |
769 | ||
770 | if (dent->d_type != DT_DIR) | |
771 | continue; | |
772 | ||
53fae771 ZJS |
773 | child = strjoin(path, "/", dent->d_name, NULL); |
774 | if (!child) | |
775 | return -ENOMEM; | |
96df036f TG |
776 | |
777 | k = parent_add_child(enumerator, child); | |
778 | if (k < 0) | |
779 | r = k; | |
780 | ||
781 | if (maxdepth > 0) | |
782 | parent_crawl_children(enumerator, child, maxdepth - 1); | |
783 | else | |
784 | log_debug("device-enumerate: max depth reached, %s: ignoring devices", child); | |
785 | } | |
786 | ||
787 | return r; | |
788 | } | |
789 | ||
790 | static int enumerator_scan_devices_children(sd_device_enumerator *enumerator) { | |
791 | const char *path; | |
792 | int r = 0, k; | |
793 | ||
794 | r = sd_device_get_syspath(enumerator->match_parent, &path); | |
795 | if (r < 0) | |
796 | return r; | |
797 | ||
798 | k = parent_add_child(enumerator, path); | |
799 | if (k < 0) | |
800 | r = k; | |
801 | ||
802 | k = parent_crawl_children(enumerator, path, DEVICE_ENUMERATE_MAX_DEPTH); | |
803 | if (k < 0) | |
804 | r = k; | |
805 | ||
806 | return r; | |
807 | } | |
808 | ||
809 | static int enumerator_scan_devices_all(sd_device_enumerator *enumerator) { | |
810 | int r = 0; | |
811 | ||
812 | log_debug("device-enumerator: scan all dirs"); | |
813 | ||
814 | if (access("/sys/subsystem", F_OK) >= 0) { | |
815 | /* we have /subsystem/, forget all the old stuff */ | |
816 | r = enumerator_scan_dir(enumerator, "subsystem", "devices", NULL); | |
e53fc357 LP |
817 | if (r < 0) |
818 | return log_debug_errno(r, "device-enumerator: failed to scan /sys/subsystem: %m"); | |
96df036f TG |
819 | } else { |
820 | int k; | |
821 | ||
822 | k = enumerator_scan_dir(enumerator, "bus", "devices", NULL); | |
823 | if (k < 0) { | |
824 | log_debug_errno(k, "device-enumerator: failed to scan /sys/bus: %m"); | |
825 | r = k; | |
826 | } | |
827 | ||
828 | k = enumerator_scan_dir(enumerator, "class", NULL, NULL); | |
829 | if (k < 0) { | |
830 | log_debug_errno(k, "device-enumerator: failed to scan /sys/class: %m"); | |
831 | r = k; | |
832 | } | |
833 | } | |
834 | ||
835 | return r; | |
836 | } | |
837 | ||
838 | int device_enumerator_scan_devices(sd_device_enumerator *enumerator) { | |
839 | sd_device *device; | |
840 | int r; | |
841 | ||
842 | assert(enumerator); | |
843 | ||
844 | if (enumerator->scan_uptodate && | |
845 | enumerator->type == DEVICE_ENUMERATION_TYPE_DEVICES) | |
846 | return 0; | |
847 | ||
848 | while ((device = prioq_pop(enumerator->devices))) | |
849 | sd_device_unref(device); | |
850 | ||
851 | if (!set_isempty(enumerator->match_tag)) { | |
852 | r = enumerator_scan_devices_tags(enumerator); | |
853 | if (r < 0) | |
854 | return r; | |
855 | } else if (enumerator->match_parent) { | |
856 | r = enumerator_scan_devices_children(enumerator); | |
857 | if (r < 0) | |
858 | return r; | |
859 | } else { | |
860 | r = enumerator_scan_devices_all(enumerator); | |
861 | if (r < 0) | |
862 | return r; | |
863 | } | |
864 | ||
865 | enumerator->scan_uptodate = true; | |
866 | ||
867 | return 0; | |
868 | } | |
869 | ||
870 | _public_ sd_device *sd_device_enumerator_get_device_first(sd_device_enumerator *enumerator) { | |
871 | int r; | |
872 | ||
873 | assert_return(enumerator, NULL); | |
874 | ||
875 | r = device_enumerator_scan_devices(enumerator); | |
876 | if (r < 0) | |
877 | return NULL; | |
878 | ||
879 | enumerator->type = DEVICE_ENUMERATION_TYPE_DEVICES; | |
880 | ||
881 | return prioq_peek(enumerator->devices); | |
882 | } | |
883 | ||
884 | _public_ sd_device *sd_device_enumerator_get_device_next(sd_device_enumerator *enumerator) { | |
885 | assert_return(enumerator, NULL); | |
886 | ||
887 | if (!enumerator->scan_uptodate || | |
888 | enumerator->type != DEVICE_ENUMERATION_TYPE_DEVICES) | |
889 | return NULL; | |
890 | ||
891 | sd_device_unref(prioq_pop(enumerator->devices)); | |
892 | ||
893 | return prioq_peek(enumerator->devices); | |
894 | } | |
895 | ||
896 | int device_enumerator_scan_subsystems(sd_device_enumerator *enumerator) { | |
897 | sd_device *device; | |
898 | const char *subsysdir; | |
899 | int r = 0, k; | |
900 | ||
901 | assert(enumerator); | |
902 | ||
903 | if (enumerator->scan_uptodate && | |
904 | enumerator->type == DEVICE_ENUMERATION_TYPE_SUBSYSTEMS) | |
905 | return 0; | |
906 | ||
907 | while ((device = prioq_pop(enumerator->devices))) | |
908 | sd_device_unref(device); | |
909 | ||
910 | /* modules */ | |
911 | if (match_subsystem(enumerator, "module")) { | |
912 | k = enumerator_scan_dir_and_add_devices(enumerator, "module", NULL, NULL); | |
913 | if (k < 0) { | |
914 | log_debug_errno(k, "device-enumerator: failed to scan modules: %m"); | |
915 | r = k; | |
916 | } | |
917 | } | |
918 | ||
919 | if (access("/sys/subsystem", F_OK) >= 0) | |
920 | subsysdir = "subsystem"; | |
921 | else | |
922 | subsysdir = "bus"; | |
923 | ||
924 | /* subsystems (only buses support coldplug) */ | |
925 | if (match_subsystem(enumerator, "subsystem")) { | |
926 | k = enumerator_scan_dir_and_add_devices(enumerator, subsysdir, NULL, NULL); | |
927 | if (k < 0) { | |
928 | log_debug_errno(k, "device-enumerator: failed to scan subsystems: %m"); | |
929 | r = k; | |
930 | } | |
931 | } | |
932 | ||
933 | /* subsystem drivers */ | |
934 | if (match_subsystem(enumerator, "drivers")) { | |
935 | k = enumerator_scan_dir(enumerator, subsysdir, "drivers", "drivers"); | |
936 | if (k < 0) { | |
937 | log_debug_errno(k, "device-enumerator: failed to scan drivers: %m"); | |
938 | r = k; | |
939 | } | |
940 | } | |
941 | ||
942 | enumerator->scan_uptodate = true; | |
943 | ||
944 | return r; | |
945 | } | |
946 | ||
947 | _public_ sd_device *sd_device_enumerator_get_subsystem_first(sd_device_enumerator *enumerator) { | |
948 | int r; | |
949 | ||
950 | assert_return(enumerator, NULL); | |
951 | ||
952 | r = device_enumerator_scan_subsystems(enumerator); | |
953 | if (r < 0) | |
954 | return NULL; | |
955 | ||
956 | enumerator->type = DEVICE_ENUMERATION_TYPE_SUBSYSTEMS; | |
957 | ||
958 | return prioq_peek(enumerator->devices); | |
959 | } | |
960 | ||
961 | _public_ sd_device *sd_device_enumerator_get_subsystem_next(sd_device_enumerator *enumerator) { | |
962 | assert_return(enumerator, NULL); | |
963 | ||
964 | if (enumerator->scan_uptodate || | |
965 | enumerator->type != DEVICE_ENUMERATION_TYPE_SUBSYSTEMS) | |
966 | return NULL; | |
967 | ||
968 | sd_device_unref(prioq_pop(enumerator->devices)); | |
969 | ||
970 | return prioq_peek(enumerator->devices); | |
971 | } | |
972 | ||
973 | sd_device *device_enumerator_get_first(sd_device_enumerator *enumerator) { | |
974 | assert_return(enumerator, NULL); | |
975 | ||
976 | return prioq_peek(enumerator->devices); | |
977 | } | |
978 | ||
979 | sd_device *device_enumerator_get_next(sd_device_enumerator *enumerator) { | |
980 | assert_return(enumerator, NULL); | |
981 | ||
982 | sd_device_unref(prioq_pop(enumerator->devices)); | |
983 | ||
984 | return prioq_peek(enumerator->devices); | |
985 | } |