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1 | /* | |
2 | * udevdb.c | |
3 | * | |
4 | * Userspace devfs | |
5 | * | |
6 | * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com> | |
7 | * Copyright (C) 2003 IBM Corp. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License as published by the | |
11 | * Free Software Foundation version 2 of the License. | |
12 | * | |
13 | * This program 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 | * General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License along | |
19 | * with this program; if not, write to the Free Software Foundation, Inc., | |
20 | * 675 Mass Ave, Cambridge, MA 02139, USA. | |
21 | * | |
22 | */ | |
23 | ||
24 | /* | |
25 | * udev database library | |
26 | */ | |
27 | #include <stdlib.h> | |
28 | #include <stdio.h> | |
29 | #include <fcntl.h> | |
30 | #include <string.h> | |
31 | #include <sys/stat.h> | |
32 | #include <errno.h> | |
33 | #include <signal.h> | |
34 | ||
35 | #include "udev_version.h" | |
36 | #include "udev.h" | |
37 | #include "namedev.h" | |
38 | #include "udevdb.h" | |
39 | #include "tdb/tdb.h" | |
40 | #include "libsysfs/libsysfs.h" | |
41 | ||
42 | static TDB_CONTEXT *udevdb; | |
43 | ||
44 | /** | |
45 | * busdb_record - bus and id are keys to look up name of device | |
46 | */ | |
47 | struct busdb_record { | |
48 | char name[NAME_SIZE]; | |
49 | }; | |
50 | ||
51 | /** | |
52 | * classdb_record - class name and class device name used as keys to find | |
53 | * device name. | |
54 | */ | |
55 | struct classdb_record { | |
56 | char name[NAME_SIZE]; | |
57 | }; | |
58 | ||
59 | struct sysfsdb_record { | |
60 | char name[PATH_SIZE]; | |
61 | }; | |
62 | ||
63 | /** | |
64 | * namedb_record - device name is key, remaining udevice info stored here. | |
65 | */ | |
66 | struct namedb_record { | |
67 | char sysfs_dev_path[PATH_SIZE]; | |
68 | char class_dev_name[NAME_SIZE]; | |
69 | char class_name[NAME_SIZE]; | |
70 | char bus[BUS_SIZE]; | |
71 | char id[ID_SIZE]; | |
72 | char driver[NAME_SIZE]; | |
73 | char type; | |
74 | int major; | |
75 | int minor; | |
76 | mode_t mode; | |
77 | }; | |
78 | ||
79 | /** | |
80 | * udevdb_close: close udev database | |
81 | */ | |
82 | static void udevdb_close(void) | |
83 | { | |
84 | if (udevdb != NULL) { | |
85 | tdb_close(udevdb); | |
86 | udevdb = NULL; | |
87 | } | |
88 | } | |
89 | ||
90 | /** | |
91 | * udevdb_open: opens udev's database | |
92 | * @method: database can either be in memory - UDEVDB_INTERNAL - or | |
93 | * written to a file with UDEVDB_DEFAULT. | |
94 | */ | |
95 | static int udevdb_open(int method) | |
96 | { | |
97 | udevdb = tdb_open(UDEV_CONFIG_DIR UDEV_DB, 0, method, O_RDWR | O_CREAT, 0644); | |
98 | if (udevdb == NULL) { | |
99 | if (method == UDEVDB_INTERNAL) | |
100 | dbg("Unable to initialize in-memory database"); | |
101 | else | |
102 | dbg("Unable to initialize database at %s", UDEV_CONFIG_DIR UDEV_DB); | |
103 | return -EINVAL; | |
104 | } | |
105 | return 0; | |
106 | } | |
107 | ||
108 | /** | |
109 | * busdb_fetch | |
110 | */ | |
111 | static struct busdb_record *busdb_fetch(const char *bus, const char *id) | |
112 | { | |
113 | TDB_DATA key, data; | |
114 | char keystr[BUS_SIZE+ID_SIZE+2]; | |
115 | struct busdb_record *rec = NULL; | |
116 | ||
117 | if (bus == NULL || id == NULL) | |
118 | return NULL; | |
119 | if (strlen(bus) >= BUS_SIZE || strlen(id) >= ID_SIZE) | |
120 | return NULL; | |
121 | ||
122 | memset(keystr, 0, (BUS_SIZE+ID_SIZE+2)); | |
123 | strcpy(keystr, bus); | |
124 | strcat(keystr, UDEVDB_DEL); | |
125 | strcat(keystr, id); | |
126 | ||
127 | key.dptr = (void *)keystr; | |
128 | key.dsize = strlen(keystr) + 1; | |
129 | ||
130 | data = tdb_fetch(udevdb, key); | |
131 | if (data.dptr == NULL || data.dsize == 0) | |
132 | return NULL; | |
133 | ||
134 | rec = (struct busdb_record *)malloc(sizeof(struct busdb_record)); | |
135 | if (rec == NULL) { | |
136 | free(data.dptr); | |
137 | return NULL; | |
138 | } | |
139 | ||
140 | memcpy(rec, data.dptr, sizeof(struct busdb_record)); | |
141 | free(data.dptr); | |
142 | ||
143 | return rec; | |
144 | } | |
145 | ||
146 | /** | |
147 | * classdb_fetch | |
148 | */ | |
149 | static struct classdb_record *classdb_fetch(const char *cls, | |
150 | const char *cls_dev) | |
151 | { | |
152 | TDB_DATA key, data; | |
153 | char keystr[NAME_SIZE+NAME_SIZE+2]; | |
154 | struct classdb_record *rec = NULL; | |
155 | ||
156 | if (cls == NULL || cls_dev == NULL) | |
157 | return NULL; | |
158 | if (strlen(cls) >= NAME_SIZE || strlen(cls_dev) >= NAME_SIZE) | |
159 | return NULL; | |
160 | ||
161 | memset(keystr, 0, (NAME_SIZE+NAME_SIZE+2)); | |
162 | strcpy(keystr, cls); | |
163 | strcat(keystr, UDEVDB_DEL); | |
164 | strcat(keystr, cls_dev); | |
165 | ||
166 | key.dptr = (void *)keystr; | |
167 | key.dsize = strlen(keystr) + 1; | |
168 | ||
169 | data = tdb_fetch(udevdb, key); | |
170 | if (data.dptr == NULL || data.dsize == 0) | |
171 | return NULL; | |
172 | ||
173 | rec = (struct classdb_record *)malloc(sizeof(struct classdb_record)); | |
174 | if (rec == NULL) { | |
175 | free(data.dptr); | |
176 | return NULL; | |
177 | } | |
178 | ||
179 | memcpy(rec, data.dptr, sizeof(struct classdb_record)); | |
180 | free(data.dptr); | |
181 | ||
182 | return rec; | |
183 | } | |
184 | ||
185 | static struct sysfsdb_record *sysfsdb_fetch(const char *path) | |
186 | { | |
187 | TDB_DATA key, data; | |
188 | char keystr[PATH_SIZE+2]; | |
189 | struct sysfsdb_record *rec = NULL; | |
190 | ||
191 | if (strlen(path) >= PATH_SIZE) | |
192 | return NULL; | |
193 | ||
194 | memset(keystr, 0, sizeof(keystr)); | |
195 | strcpy(keystr, path); | |
196 | ||
197 | dbg("keystr = %s", keystr); | |
198 | ||
199 | key.dptr = (void *)keystr; | |
200 | key.dsize = strlen(keystr) + 1; | |
201 | ||
202 | data = tdb_fetch(udevdb, key); | |
203 | if (data.dptr == NULL || data.dsize == 0) { | |
204 | dbg("tdb_fetch did not work :("); | |
205 | return NULL; | |
206 | } | |
207 | ||
208 | rec = (struct sysfsdb_record *)malloc(sizeof(struct sysfsdb_record)); | |
209 | if (rec == NULL) { | |
210 | free(data.dptr); | |
211 | return NULL; | |
212 | } | |
213 | ||
214 | memcpy(rec, data.dptr, sizeof(struct sysfsdb_record)); | |
215 | free(data.dptr); | |
216 | ||
217 | return rec; | |
218 | } | |
219 | ||
220 | /** | |
221 | * namedb_fetch | |
222 | */ | |
223 | static struct namedb_record *namedb_fetch(const char *name) | |
224 | { | |
225 | TDB_DATA key, data; | |
226 | char nm_keystr[NAME_SIZE]; | |
227 | struct namedb_record *nrec = NULL; | |
228 | ||
229 | if (name == NULL) | |
230 | return NULL; | |
231 | if (strlen(name) >= NAME_SIZE) | |
232 | return NULL; | |
233 | ||
234 | memset(nm_keystr, 0, NAME_SIZE); | |
235 | strcpy(nm_keystr, name); | |
236 | ||
237 | key.dptr = (void *)nm_keystr; | |
238 | key.dsize = strlen(nm_keystr) + 1; | |
239 | ||
240 | data = tdb_fetch(udevdb, key); | |
241 | if (data.dptr == NULL || data.dsize == 0) | |
242 | return NULL; | |
243 | ||
244 | nrec = (struct namedb_record *)malloc(sizeof(struct namedb_record)); | |
245 | if (nrec == NULL) { | |
246 | free(data.dptr); | |
247 | return NULL; | |
248 | } | |
249 | ||
250 | memcpy(nrec, data.dptr, sizeof(struct namedb_record)); | |
251 | free(data.dptr); | |
252 | ||
253 | return nrec; | |
254 | } | |
255 | ||
256 | /** | |
257 | * busdb_store | |
258 | */ | |
259 | static int busdb_store(const struct udevice *dev) | |
260 | { | |
261 | TDB_DATA key, data; | |
262 | char keystr[BUS_SIZE+ID_SIZE+2]; | |
263 | struct busdb_record rec; | |
264 | int retval = 0; | |
265 | ||
266 | if (dev == NULL) | |
267 | return -1; | |
268 | ||
269 | memset(keystr, 0, (BUS_SIZE+ID_SIZE+2)); | |
270 | strcpy(keystr, dev->bus_name); | |
271 | strcat(keystr, UDEVDB_DEL); | |
272 | strcat(keystr, dev->bus_id); | |
273 | ||
274 | key.dptr = (void *)keystr; | |
275 | key.dsize = strlen(keystr) + 1; | |
276 | ||
277 | strcpy(rec.name, dev->name); | |
278 | ||
279 | data.dptr = (void *) &rec; | |
280 | data.dsize = sizeof(rec); | |
281 | ||
282 | retval = tdb_store(udevdb, key, data, TDB_REPLACE); | |
283 | return retval; | |
284 | } | |
285 | ||
286 | /** | |
287 | * classdb_store | |
288 | */ | |
289 | static int classdb_store(const struct udevice *dev) | |
290 | { | |
291 | TDB_DATA key, data; | |
292 | char keystr[NAME_SIZE+NAME_SIZE+2]; | |
293 | struct classdb_record rec; | |
294 | int retval = 0; | |
295 | ||
296 | if (dev == NULL) | |
297 | return -1; | |
298 | ||
299 | memset(keystr, 0, (NAME_SIZE+NAME_SIZE+2)); | |
300 | strcpy(keystr, dev->class_name); | |
301 | strcat(keystr, UDEVDB_DEL); | |
302 | strcat(keystr, dev->class_dev_name); | |
303 | ||
304 | key.dptr = (void *)keystr; | |
305 | key.dsize = strlen(keystr) + 1; | |
306 | ||
307 | strcpy(rec.name, dev->name); | |
308 | ||
309 | data.dptr = (void *) &rec; | |
310 | data.dsize = sizeof(rec); | |
311 | ||
312 | retval = tdb_store(udevdb, key, data, TDB_REPLACE); | |
313 | return retval; | |
314 | } | |
315 | ||
316 | static int sysfs_store(const char *path, const struct udevice *dev) | |
317 | { | |
318 | TDB_DATA key, data; | |
319 | char keystr[PATH_SIZE+2]; | |
320 | struct sysfsdb_record rec; | |
321 | int retval = 0; | |
322 | ||
323 | if (dev == NULL) | |
324 | return -ENODEV; | |
325 | ||
326 | memset(keystr, 0, sizeof(keystr)); | |
327 | strcpy(keystr, path); | |
328 | dbg("keystr = %s", keystr); | |
329 | ||
330 | key.dptr = (void *)keystr; | |
331 | key.dsize = strlen(keystr) + 1; | |
332 | ||
333 | strcpy(rec.name, dev->name); | |
334 | ||
335 | data.dptr = (void *) &rec; | |
336 | data.dsize = sizeof(rec); | |
337 | ||
338 | retval = tdb_store(udevdb, key, data, TDB_REPLACE); | |
339 | return retval; | |
340 | } | |
341 | ||
342 | /** | |
343 | * namedb_store | |
344 | */ | |
345 | static int namedb_store(const struct udevice *dev) | |
346 | { | |
347 | TDB_DATA key, data; | |
348 | char keystr[NAME_SIZE]; | |
349 | struct namedb_record rec; | |
350 | int retval = 0; | |
351 | ||
352 | if (dev == NULL) | |
353 | return -1; | |
354 | ||
355 | memset(keystr, 0, NAME_SIZE); | |
356 | strcpy(keystr, dev->name); | |
357 | ||
358 | key.dptr = (void *)keystr; | |
359 | key.dsize = strlen(keystr) + 1; | |
360 | ||
361 | strcpy(rec.sysfs_dev_path, dev->sysfs_dev_path); | |
362 | strcpy(rec.bus, dev->bus_name); | |
363 | strcpy(rec.id, dev->bus_id); | |
364 | strcpy(rec.class_dev_name, dev->class_dev_name); | |
365 | strcpy(rec.class_name, dev->class_name); | |
366 | strcpy(rec.driver, dev->driver); | |
367 | rec.type = dev->type; | |
368 | rec.major = dev->major; | |
369 | rec.minor = dev->minor; | |
370 | rec.mode = dev->mode; | |
371 | ||
372 | data.dptr = (void *) &rec; | |
373 | data.dsize = sizeof(rec); | |
374 | ||
375 | retval = tdb_store(udevdb, key, data, TDB_REPLACE); | |
376 | return retval; | |
377 | } | |
378 | ||
379 | /** | |
380 | * busdb_delete | |
381 | */ | |
382 | static int busdb_delete(const char *bus, const char *id) | |
383 | { | |
384 | TDB_DATA key; | |
385 | char keystr[BUS_SIZE+ID_SIZE+2]; | |
386 | int retval = 0; | |
387 | ||
388 | if (bus == NULL || id == NULL) | |
389 | return -1; | |
390 | if (strlen(bus) >= BUS_SIZE || strlen(id) >= ID_SIZE) | |
391 | return -1; | |
392 | ||
393 | memset(keystr, 0, (BUS_SIZE+ID_SIZE+2)); | |
394 | strcpy(keystr, bus); | |
395 | strcat(keystr, UDEVDB_DEL); | |
396 | strcat(keystr, id); | |
397 | ||
398 | key.dptr = (void *)keystr; | |
399 | key.dsize = strlen(keystr) + 1; | |
400 | ||
401 | retval = tdb_delete(udevdb, key); | |
402 | return retval; | |
403 | } | |
404 | ||
405 | /** | |
406 | * classdb_delete | |
407 | */ | |
408 | static int classdb_delete(const char *cls, const char *cls_dev) | |
409 | { | |
410 | TDB_DATA key; | |
411 | char keystr[NAME_SIZE+NAME_SIZE+2]; | |
412 | int retval = 0; | |
413 | ||
414 | if (cls == NULL || cls_dev == NULL) | |
415 | return -1; | |
416 | if (strlen(cls) >= NAME_SIZE || strlen(cls_dev) >= NAME_SIZE) | |
417 | return -1; | |
418 | ||
419 | memset(keystr, 0, (NAME_SIZE+NAME_SIZE+2)); | |
420 | strcpy(keystr, cls); | |
421 | strcat(keystr, UDEVDB_DEL); | |
422 | strcat(keystr, cls_dev); | |
423 | ||
424 | key.dptr = (void *)keystr; | |
425 | key.dsize = strlen(keystr) + 1; | |
426 | ||
427 | retval = tdb_delete(udevdb, key); | |
428 | return retval; | |
429 | } | |
430 | ||
431 | /** | |
432 | * namedb_delete | |
433 | */ | |
434 | static int namedb_delete(const char *name) | |
435 | { | |
436 | TDB_DATA key; | |
437 | char keystr[NAME_SIZE]; | |
438 | int retval = 0; | |
439 | ||
440 | if (name == NULL) | |
441 | return -1; | |
442 | if (strlen(name) >= NAME_SIZE) | |
443 | return -1; | |
444 | ||
445 | memset(keystr, 0, NAME_SIZE); | |
446 | strcpy(keystr, name); | |
447 | ||
448 | key.dptr = (void *)keystr; | |
449 | key.dsize = strlen(keystr) + 1; | |
450 | ||
451 | retval = tdb_delete(udevdb, key); | |
452 | return retval; | |
453 | } | |
454 | ||
455 | /** | |
456 | * udevdb_delete_udevice | |
457 | */ | |
458 | int udevdb_delete_udevice(const char *name) | |
459 | { | |
460 | struct namedb_record *nrec = NULL; | |
461 | ||
462 | if (name == NULL) | |
463 | return -1; | |
464 | ||
465 | nrec = namedb_fetch(name); | |
466 | if (nrec == NULL) | |
467 | return -1; | |
468 | ||
469 | busdb_delete(nrec->bus, nrec->id); | |
470 | classdb_delete(nrec->class_name, nrec->class_dev_name); | |
471 | namedb_delete(name); | |
472 | free(nrec); | |
473 | ||
474 | return 0; | |
475 | } | |
476 | ||
477 | /** | |
478 | * udevdb_add_device: adds class device to database | |
479 | */ | |
480 | int udevdb_add_device(const char *device, const struct sysfs_class_device *class_dev, const char *name, char type, int major, int minor, int mode) | |
481 | { | |
482 | struct udevice dbdev; | |
483 | ||
484 | if (class_dev == NULL) | |
485 | return -ENODEV; | |
486 | ||
487 | memset(&dbdev, 0, sizeof(dbdev)); | |
488 | strncpy(dbdev.name, name, NAME_SIZE); | |
489 | if (class_dev->sysdevice) { | |
490 | strncpy(dbdev.sysfs_dev_path, class_dev->sysdevice->directory->path, PATH_SIZE); | |
491 | strncpy(dbdev.bus_id, class_dev->sysdevice->bus_id, ID_SIZE); | |
492 | } | |
493 | strncpy(dbdev.class_dev_name, class_dev->name, NAME_SIZE); | |
494 | // if ((sysfs_get_name_from_path(subsystem, dbdev.class_name, NAME_SIZE)) != 0) | |
495 | // strcpy(dbdev.class_name, "unknown"); | |
496 | strcpy(dbdev.bus_name, "unknown"); | |
497 | if (class_dev->driver != NULL) | |
498 | strncpy(dbdev.driver, class_dev->driver->name, NAME_SIZE); | |
499 | else | |
500 | strcpy(dbdev.driver, "unknown"); | |
501 | dbdev.type = type; | |
502 | dbdev.major = major; | |
503 | dbdev.minor = minor; | |
504 | dbdev.mode = mode; | |
505 | ||
506 | if ((busdb_store(&dbdev)) != 0) | |
507 | return -1; | |
508 | if ((classdb_store(&dbdev)) != 0) | |
509 | return -1; | |
510 | if ((sysfs_store(device, &dbdev)) != 0) | |
511 | return -1; | |
512 | if ((namedb_store(&dbdev)) != 0) | |
513 | return -1; | |
514 | ||
515 | return 0; | |
516 | } | |
517 | ||
518 | /** | |
519 | * udevdb_get_device: grab's device by name | |
520 | */ | |
521 | struct udevice *udevdb_get_udevice(const char *name) | |
522 | { | |
523 | struct namedb_record *nrec = NULL; | |
524 | struct udevice *dev = NULL; | |
525 | ||
526 | if (name == NULL) | |
527 | return NULL; | |
528 | ||
529 | nrec = namedb_fetch(name); | |
530 | if (nrec == NULL) | |
531 | return NULL; | |
532 | ||
533 | dev = (struct udevice *)malloc(sizeof(struct udevice)); | |
534 | if (dev == NULL) { | |
535 | free(nrec); | |
536 | return NULL; | |
537 | } | |
538 | ||
539 | strcpy(dev->name, name); | |
540 | strcpy(dev->sysfs_dev_path, nrec->sysfs_dev_path); | |
541 | strcpy(dev->class_dev_name, nrec->class_dev_name); | |
542 | strcpy(dev->class_name, nrec->class_name); | |
543 | strcpy(dev->bus_name, nrec->bus); | |
544 | strcpy(dev->bus_id, nrec->id); | |
545 | dev->type = nrec->type; | |
546 | dev->major = nrec->major; | |
547 | dev->minor = nrec->minor; | |
548 | dev->mode = nrec->mode; | |
549 | ||
550 | free(nrec); | |
551 | ||
552 | return dev; | |
553 | } | |
554 | ||
555 | /** | |
556 | * udevdb_get_device_by_bus | |
557 | */ | |
558 | struct udevice *udevdb_get_udevice_by_bus(const char *bus, const char *id) | |
559 | { | |
560 | struct busdb_record *brec = NULL; | |
561 | struct udevice *dev = NULL; | |
562 | ||
563 | if (bus == NULL || id == NULL) | |
564 | return NULL; | |
565 | ||
566 | brec = busdb_fetch(bus, id); | |
567 | if (brec == NULL) | |
568 | return NULL; | |
569 | ||
570 | dev = udevdb_get_udevice(brec->name); | |
571 | free(brec); | |
572 | ||
573 | return dev; | |
574 | } | |
575 | ||
576 | /** | |
577 | * udevdb_get_udevice_by_class | |
578 | */ | |
579 | struct udevice *udevdb_get_udevice_by_class(const char *cls, | |
580 | const char *cls_dev) | |
581 | { | |
582 | struct classdb_record *crec = NULL; | |
583 | struct udevice *dev = NULL; | |
584 | ||
585 | if (cls == NULL || cls_dev == NULL) | |
586 | return NULL; | |
587 | ||
588 | crec = classdb_fetch(cls, cls_dev); | |
589 | if (crec == NULL) | |
590 | return NULL; | |
591 | ||
592 | dev = udevdb_get_udevice(crec->name); | |
593 | free(crec); | |
594 | ||
595 | return dev; | |
596 | } | |
597 | ||
598 | ||
599 | char *udevdb_get_udevice_by_sysfs(const char *path) | |
600 | { | |
601 | struct sysfsdb_record *crec = NULL; | |
602 | // struct udevice *dev = NULL; | |
603 | ||
604 | if (path == NULL) | |
605 | return NULL; | |
606 | ||
607 | crec = sysfsdb_fetch(path); | |
608 | if (crec == NULL) | |
609 | return NULL; | |
610 | ||
611 | // FIXME leak!!! | |
612 | return crec->name; | |
613 | // dev = udevdb_get_udevice(crec->name); | |
614 | // free(crec); | |
615 | // | |
616 | // return dev; | |
617 | } | |
618 | ||
619 | /** | |
620 | * udevdb_exit: closes database | |
621 | */ | |
622 | void udevdb_exit(void) | |
623 | { | |
624 | udevdb_close(); | |
625 | } | |
626 | ||
627 | /** | |
628 | * udevdb_init: initializes database | |
629 | */ | |
630 | int udevdb_init(int init_flag) | |
631 | { | |
632 | if (init_flag != UDEVDB_DEFAULT && init_flag != UDEVDB_INTERNAL) | |
633 | return -1; | |
634 | ||
635 | return udevdb_open(init_flag); | |
636 | } |