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