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Changelog for beta 9013V1.1w
[tomato.git] / release / src / router / udev / udev_rules.c
blobcb74da56e37ae0da284a5f67b1692ce5965b11b0
1 /*
2 * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
3 * Copyright (C) 2003-2006 Kay Sievers <kay.sievers@vrfy.org>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation version 2 of the License.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
17 *
18 */
19
20 #include <stddef.h>
21 #include <stdlib.h>
22 #include <string.h>
23 #include <stdio.h>
24 #include <fcntl.h>
25 #include <ctype.h>
26 #include <unistd.h>
27 #include <errno.h>
28 #include <syslog.h>
29 #include <fnmatch.h>
30 #include <sys/wait.h>
31 #include <sys/stat.h>
32
33 #include "udev.h"
34 #include "udev_rules.h"
35
36
37 /* extract possible {attr} and move str behind it */
38 static char *get_format_attribute(char **str)
39 {
40 char *pos;
41 char *attr = NULL;
42
43 if (*str[0] == '{') {
44 pos = strchr(*str, '}');
45 if (pos == NULL) {
46 err("missing closing brace for format");
47 return NULL;
48 }
49 pos[0] = '\0';
50 attr = *str+1;
51 *str = pos+1;
52 dbg("attribute='%s', str='%s'", attr, *str);
53 }
54 return attr;
55 }
56
57 /* extract possible format length and move str behind it*/
58 static int get_format_len(char **str)
59 {
60 int num;
61 char *tail;
62
63 if (isdigit(*str[0])) {
64 num = (int) strtoul(*str, &tail, 10);
65 if (num > 0) {
66 *str = tail;
67 dbg("format length=%i", num);
68 return num;
69 } else {
70 err("format parsing error '%s'", *str);
71 }
72 }
73 return -1;
74 }
75
76 static int get_key(char **line, char **key, char **value)
77 {
78 char *linepos;
79 char *temp;
80
81 linepos = *line;
82 if (linepos == NULL)
83 return -1;
84
85 /* skip whitespace */
86 while (isspace(linepos[0]))
87 linepos++;
88
89 /* get the key */
90 temp = strchr(linepos, '=');
91 if (temp == NULL || temp == linepos)
92 return -1;
93 temp[0] = '\0';
94 *key = linepos;
95 linepos = &temp[1];
96
97 /* get a quoted value */
98 if (linepos[0] == '"' || linepos[0] == '\'') {
99 temp = strchr(&linepos[1], linepos[0]);
100 if (temp != NULL) {
101 temp[0] = '\0';
102 *value = &linepos[1];
103 goto out;
104 }
105 }
106
107 /* get the value*/
108 temp = strchr(linepos, '\n');
109 if (temp != NULL)
110 temp[0] = '\0';
111 *value = linepos;
112 out:
113 return 0;
114 }
115
116 static int import_keys_into_env(struct udevice *udev, const char *buf, size_t bufsize)
117 {
118 char line[LINE_SIZE];
119 const char *bufline;
120 char *linepos;
121 char *variable;
122 char *value;
123 size_t cur;
124 size_t count;
125 int lineno;
126
127 /* loop through the whole buffer */
128 lineno = 0;
129 cur = 0;
130 while (cur < bufsize) {
131 count = buf_get_line(buf, bufsize, cur);
132 bufline = &buf[cur];
133 cur += count+1;
134 lineno++;
135
136 if (count >= sizeof(line)) {
137 err("line too long, conf line skipped %s, line %d", udev_config_filename, lineno);
138 continue;
139 }
140
141 /* eat the whitespace */
142 while ((count > 0) && isspace(bufline[0])) {
143 bufline++;
144 count--;
145 }
146 if (count == 0)
147 continue;
148
149 /* see if this is a comment */
150 if (bufline[0] == COMMENT_CHARACTER)
151 continue;
152
153 memcpy(line, bufline, count);
154 line[count] = '\0';
155
156 linepos = line;
157 if (get_key(&linepos, &variable, &value) == 0) {
158 dbg("import '%s=%s'", variable, value);
159
160 /* handle device, renamed by external tool, returning new path */
161 if (strcmp(variable, "DEVPATH") == 0) {
162 info("updating devpath from '%s' to '%s'", udev->dev->devpath, value);
163 sysfs_device_set_values(udev->dev, value, NULL, NULL);
164 } else
165 name_list_key_add(&udev->env_list, variable, value);
166 setenv(variable, value, 1);
167 }
168 }
169
170 return 0;
171 }
172
173 static int import_file_into_env(struct udevice *udev, const char *filename)
174 {
175 char *buf;
176 size_t bufsize;
177
178 if (file_map(filename, &buf, &bufsize) != 0) {
179 err("can't open '%s': %s", filename, strerror(errno));
180 return -1;
181 }
182 import_keys_into_env(udev, buf, bufsize);
183 file_unmap(buf, bufsize);
184
185 return 0;
186 }
187
188 static int import_program_into_env(struct udevice *udev, const char *program)
189 {
190 char result[2048];
191 size_t reslen;
192
193 if (run_program(program, udev->dev->subsystem, result, sizeof(result), &reslen, (udev_log_priority >= LOG_INFO)) != 0)
194 return -1;
195 return import_keys_into_env(udev, result, reslen);
196 }
197
198 static int import_parent_into_env(struct udevice *udev, const char *filter)
199 {
200 struct sysfs_device *dev_parent;
201 int rc = -1;
202
203 dev_parent = sysfs_device_get_parent(udev->dev);
204 if (dev_parent != NULL) {
205 struct udevice *udev_parent;
206 struct name_entry *name_loop;
207
208 dbg("found parent '%s', get the node name", dev_parent->devpath);
209 udev_parent = udev_device_init(NULL);
210 if (udev_parent == NULL)
211 return -1;
212 /* import the udev_db of the parent */
213 if (udev_db_get_device(udev_parent, dev_parent->devpath) == 0) {
214 dbg("import stored parent env '%s'", udev_parent->name);
215 list_for_each_entry(name_loop, &udev_parent->env_list, node) {
216 char name[NAME_SIZE];
217 char *pos;
218
219 strlcpy(name, name_loop->name, sizeof(name));
220 pos = strchr(name, '=');
221 if (pos) {
222 pos[0] = '\0';
223 pos++;
224 if (fnmatch(filter, name, 0) == 0) {
225 dbg("import key '%s'", name_loop->name);
226 name_list_add(&udev->env_list, name_loop->name, 0);
227 setenv(name, pos, 1);
228 } else
229 dbg("skip key '%s'", name_loop->name);
230 }
231 }
232 rc = 0;
233 } else
234 dbg("parent not found in database");
235 udev_device_cleanup(udev_parent);
236 }
237
238 return rc;
239 }
240
241 #define WAIT_LOOP_PER_SECOND 50
242 static int wait_for_sysfs(struct udevice *udev, const char *file, int timeout)
243 {
244 char devicepath[PATH_SIZE];
245 char filepath[PATH_SIZE];
246 struct stat stats;
247 int loop = timeout * WAIT_LOOP_PER_SECOND;
248
249 strlcpy(devicepath, sysfs_path, sizeof(devicepath));
250 strlcat(devicepath, udev->dev->devpath, sizeof(devicepath));
251 strlcpy(filepath, devicepath, sizeof(filepath));
252 strlcat(filepath, "/", sizeof(filepath));
253 strlcat(filepath, file, sizeof(filepath));
254
255 dbg("will wait %i sec for '%s'", timeout, filepath);
256 while (--loop) {
257 /* lookup file */
258 if (stat(filepath, &stats) == 0) {
259 info("file '%s' appeared after %i loops", filepath, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
260 return 0;
261 }
262 /* make sure, the device did not disappear in the meantime */
263 if (stat(devicepath, &stats) != 0) {
264 info("device disappeared while waiting for '%s'", filepath);
265 return -2;
266 }
267 info("wait for '%s' for %i mseconds", filepath, 1000 / WAIT_LOOP_PER_SECOND);
268 usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
269 }
270 info("waiting for '%s' failed", filepath);
271 return -1;
272 }
273
274 /* handle "[$SUBSYSTEM/$KERNEL]<attribute>" lookup */
275 static int attr_get_by_subsys_id(const char *attrstr, char *devpath, size_t len, char **attr)
276 {
277 char subsys[NAME_SIZE];
278 char *attrib;
279 char *id;
280 int found = 0;
281
282 if (attrstr[0] != '[')
283 goto out;
284
285 strlcpy(subsys, &attrstr[1], sizeof(subsys));
286
287 attrib = strchr(subsys, ']');
288 if (attrib == NULL)
289 goto out;
290 attrib[0] = '\0';
291 attrib = &attrib[1];
292
293 id = strchr(subsys, '/');
294 if (id == NULL)
295 goto out;
296 id[0] = '\0';
297 id = &id[1];
298
299 if (sysfs_lookup_devpath_by_subsys_id(devpath, len, subsys, id)) {
300 if (attr != NULL) {
301 if (attrib[0] != '\0')
302 *attr = attrib;
303 else
304 *attr = NULL;
305 }
306 found = 1;
307 }
308 out:
309 return found;
310 }
311
312 void udev_rules_apply_format(struct udevice *udev, char *string, size_t maxsize)
313 {
314 char temp[PATH_SIZE];
315 char temp2[PATH_SIZE];
316 char *head, *tail, *pos, *cpos, *attr, *rest;
317 int len;
318 int i;
319 int count;
320 enum subst_type {
321 SUBST_UNKNOWN,
322 SUBST_DEVPATH,
323 SUBST_KERNEL,
324 SUBST_KERNEL_NUMBER,
325 SUBST_ID,
326 SUBST_MAJOR,
327 SUBST_MINOR,
328 SUBST_RESULT,
329 SUBST_ATTR,
330 SUBST_PARENT,
331 SUBST_TEMP_NODE,
332 SUBST_ROOT,
333 SUBST_SYS,
334 SUBST_ENV,
335 };
336 static const struct subst_map {
337 char *name;
338 char fmt;
339 enum subst_type type;
340 } map[] = {
341 { .name = "devpath", .fmt = 'p', .type = SUBST_DEVPATH },
342 { .name = "number", .fmt = 'n', .type = SUBST_KERNEL_NUMBER },
343 { .name = "kernel", .fmt = 'k', .type = SUBST_KERNEL },
344 { .name = "id", .fmt = 'b', .type = SUBST_ID },
345 { .name = "major", .fmt = 'M', .type = SUBST_MAJOR },
346 { .name = "minor", .fmt = 'm', .type = SUBST_MINOR },
347 { .name = "result", .fmt = 'c', .type = SUBST_RESULT },
348 { .name = "attr", .fmt = 's', .type = SUBST_ATTR },
349 { .name = "sysfs", .fmt = 's', .type = SUBST_ATTR },
350 { .name = "parent", .fmt = 'P', .type = SUBST_PARENT },
351 { .name = "tempnode", .fmt = 'N', .type = SUBST_TEMP_NODE },
352 { .name = "root", .fmt = 'r', .type = SUBST_ROOT },
353 { .name = "sys", .fmt = 'S', .type = SUBST_SYS },
354 { .name = "env", .fmt = 'E', .type = SUBST_ENV },
355 { NULL, '\0', 0 }
356 };
357 enum subst_type type;
358 const struct subst_map *subst;
359
360 head = string;
361 while (1) {
362 len = -1;
363 while (head[0] != '\0') {
364 if (head[0] == '$') {
365 /* substitute named variable */
366 if (head[1] == '\0')
367 break;
368 if (head[1] == '$') {
369 strlcpy(temp, head+2, sizeof(temp));
370 strlcpy(head+1, temp, maxsize);
371 head++;
372 continue;
373 }
374 head[0] = '\0';
375 for (subst = map; subst->name; subst++) {
376 if (strncasecmp(&head[1], subst->name, strlen(subst->name)) == 0) {
377 type = subst->type;
378 tail = head + strlen(subst->name)+1;
379 dbg("will substitute format name '%s'", subst->name);
380 goto found;
381 }
382 }
383 head[0] = '$';
384 err("unknown format variable '%s'", head);
385 } else if (head[0] == '%') {
386 /* substitute format char */
387 if (head[1] == '\0')
388 break;
389 if (head[1] == '%') {
390 strlcpy(temp, head+2, sizeof(temp));
391 strlcpy(head+1, temp, maxsize);
392 head++;
393 continue;
394 }
395 head[0] = '\0';
396 tail = head+1;
397 len = get_format_len(&tail);
398 for (subst = map; subst->name; subst++) {
399 if (tail[0] == subst->fmt) {
400 type = subst->type;
401 tail++;
402 dbg("will substitute format char '%c'", subst->fmt);
403 goto found;
404 }
405 }
406 head[0] = '%';
407 err("unknown format char '%c'", tail[0]);
408 }
409 head++;
410 }
411 break;
412 found:
413 attr = get_format_attribute(&tail);
414 strlcpy(temp, tail, sizeof(temp));
415 dbg("format=%i, string='%s', tail='%s'", type ,string, tail);
416
417 switch (type) {
418 case SUBST_DEVPATH:
419 strlcat(string, udev->dev->devpath, maxsize);
420 dbg("substitute devpath '%s'", udev->dev->devpath);
421 break;
422 case SUBST_KERNEL:
423 strlcat(string, udev->dev->kernel, maxsize);
424 dbg("substitute kernel name '%s'", udev->dev->kernel);
425 break;
426 case SUBST_KERNEL_NUMBER:
427 strlcat(string, udev->dev->kernel_number, maxsize);
428 dbg("substitute kernel number '%s'", udev->dev->kernel_number);
429 break;
430 case SUBST_ID:
431 if (udev->dev_parent != NULL) {
432 strlcat(string, udev->dev_parent->kernel, maxsize);
433 dbg("substitute id '%s'", udev->dev_parent->kernel);
434 }
435 break;
436 case SUBST_MAJOR:
437 sprintf(temp2, "%d", major(udev->devt));
438 strlcat(string, temp2, maxsize);
439 dbg("substitute major number '%s'", temp2);
440 break;
441 case SUBST_MINOR:
442 sprintf(temp2, "%d", minor(udev->devt));
443 strlcat(string, temp2, maxsize);
444 dbg("substitute minor number '%s'", temp2);
445 break;
446 case SUBST_RESULT:
447 if (udev->program_result[0] == '\0')
448 break;
449 /* get part part of the result string */
450 i = 0;
451 if (attr != NULL)
452 i = strtoul(attr, &rest, 10);
453 if (i > 0) {
454 dbg("request part #%d of result string", i);
455 cpos = udev->program_result;
456 while (--i) {
457 while (cpos[0] != '\0' && !isspace(cpos[0]))
458 cpos++;
459 while (isspace(cpos[0]))
460 cpos++;
461 }
462 if (i > 0) {
463 err("requested part of result string not found");
464 break;
465 }
466 strlcpy(temp2, cpos, sizeof(temp2));
467 /* %{2+}c copies the whole string from the second part on */
468 if (rest[0] != '+') {
469 cpos = strchr(temp2, ' ');
470 if (cpos)
471 cpos[0] = '\0';
472 }
473 strlcat(string, temp2, maxsize);
474 dbg("substitute part of result string '%s'", temp2);
475 } else {
476 strlcat(string, udev->program_result, maxsize);
477 dbg("substitute result string '%s'", udev->program_result);
478 }
479 break;
480 case SUBST_ATTR:
481 if (attr == NULL)
482 err("missing file parameter for attr");
483 else {
484 char devpath[PATH_SIZE];
485 char *attrib;
486 const char *value = NULL;
487 size_t size;
488
489 if (attr_get_by_subsys_id(attr, devpath, sizeof(devpath), &attrib)) {
490 if (attrib != NULL)
491 value = sysfs_attr_get_value(devpath, attrib);
492 else
493 break;
494 }
495
496 /* try the current device, other matches may have selected */
497 if (value == NULL && udev->dev_parent != NULL && udev->dev_parent != udev->dev)
498 value = sysfs_attr_get_value(udev->dev_parent->devpath, attr);
499
500 /* look at all devices along the chain of parents */
501 if (value == NULL) {
502 struct sysfs_device *dev_parent = udev->dev;
503
504 do {
505 dbg("looking at '%s'", dev_parent->devpath);
506 value = sysfs_attr_get_value(dev_parent->devpath, attr);
507 if (value != NULL) {
508 strlcpy(temp2, value, sizeof(temp2));
509 break;
510 }
511 dev_parent = sysfs_device_get_parent(dev_parent);
512 } while (dev_parent != NULL);
513 }
514
515 if (value == NULL)
516 break;
517
518 /* strip trailing whitespace, and replace unwanted characters */
519 size = strlcpy(temp2, value, sizeof(temp2));
520 if (size >= sizeof(temp2))
521 size = sizeof(temp2)-1;
522 while (size > 0 && isspace(temp2[size-1]))
523 temp2[--size] = '\0';
524 count = replace_chars(temp2, ALLOWED_CHARS_INPUT);
525 if (count > 0)
526 info("%i character(s) replaced" , count);
527 strlcat(string, temp2, maxsize);
528 dbg("substitute sysfs value '%s'", temp2);
529 }
530 break;
531 case SUBST_PARENT:
532 {
533 struct sysfs_device *dev_parent;
534
535 dev_parent = sysfs_device_get_parent(udev->dev);
536 if (dev_parent != NULL) {
537 struct udevice *udev_parent;
538
539 dbg("found parent '%s', get the node name", dev_parent->devpath);
540 udev_parent = udev_device_init(NULL);
541 if (udev_parent != NULL) {
542 /* lookup the name in the udev_db with the DEVPATH of the parent */
543 if (udev_db_get_device(udev_parent, dev_parent->devpath) == 0) {
544 strlcat(string, udev_parent->name, maxsize);
545 dbg("substitute parent node name'%s'", udev_parent->name);
546 } else
547 dbg("parent not found in database");
548 udev_device_cleanup(udev_parent);
549 }
550 }
551 }
552 break;
553 case SUBST_TEMP_NODE:
554 if (udev->tmp_node[0] == '\0' && major(udev->devt) > 0) {
555 dbg("create temporary device node for callout");
556 snprintf(udev->tmp_node, sizeof(udev->tmp_node), "%s/.tmp-%u-%u",
557 udev_root, major(udev->devt), minor(udev->devt));
558 udev->tmp_node[sizeof(udev->tmp_node)-1] = '\0';
559 udev_node_mknod(udev, udev->tmp_node, udev->devt, 0600, 0, 0);
560 }
561 strlcat(string, udev->tmp_node, maxsize);
562 dbg("substitute temporary device node name '%s'", udev->tmp_node);
563 break;
564 case SUBST_ROOT:
565 strlcat(string, udev_root, maxsize);
566 dbg("substitute udev_root '%s'", udev_root);
567 break;
568 case SUBST_SYS:
569 strlcat(string, sysfs_path, maxsize);
570 dbg("substitute sysfs_path '%s'", sysfs_path);
571 break;
572 case SUBST_ENV:
573 if (attr == NULL) {
574 dbg("missing attribute");
575 break;
576 }
577 pos = getenv(attr);
578 if (pos == NULL) {
579 dbg("env '%s' not available", attr);
580 break;
581 }
582 dbg("substitute env '%s=%s'", attr, pos);
583 strlcat(string, pos, maxsize);
584 break;
585 default:
586 err("unknown substitution type=%i", type);
587 break;
588 }
589 /* possibly truncate to format-char specified length */
590 if (len >= 0 && len < (int)strlen(head)) {
591 head[len] = '\0';
592 dbg("truncate to %i chars, subtitution string becomes '%s'", len, head);
593 }
594 strlcat(string, temp, maxsize);
595 }
596 }
597
598 static char *key_val(struct udev_rule *rule, struct key *key)
599 {
600 return rule->buf + key->val_off;
601 }
602
603 static char *key_pair_name(struct udev_rule *rule, struct key_pair *pair)
604 {
605 return rule->buf + pair->key_name_off;
606 }
607
608 static int match_key(const char *key_name, struct udev_rule *rule, struct key *key, const char *val)
609 {
610 char value[PATH_SIZE];
611 char *key_value;
612 char *pos;
613 int match = 0;
614
615 if (key->operation != KEY_OP_MATCH &&
616 key->operation != KEY_OP_NOMATCH)
617 return 0;
618
619 /* look for a matching string, parts are separated by '|' */
620 strlcpy(value, rule->buf + key->val_off, sizeof(value));
621 key_value = value;
622 dbg("key %s value='%s'", key_name, key_value);
623 while (key_value) {
624 pos = strchr(key_value, '|');
625 if (pos) {
626 pos[0] = '\0';
627 pos++;
628 }
629
630 dbg("match %s '%s' <-> '%s'", key_name, key_value, val);
631 match = (fnmatch(key_value, val, 0) == 0);
632 if (match)
633 break;
634
635 key_value = pos;
636 }
637
638 if (match && (key->operation == KEY_OP_MATCH)) {
639 dbg("%s is true (matching value)", key_name);
640 return 0;
641 }
642 if (!match && (key->operation == KEY_OP_NOMATCH)) {
643 dbg("%s is true (non-matching value)", key_name);
644 return 0;
645 }
646 return -1;
647 }
648
649 /* match a single rule against a given device and possibly its parent devices */
650 static int match_rule(struct udevice *udev, struct udev_rule *rule)
651 {
652 int i;
653
654 if (match_key("ACTION", rule, &rule->action, udev->action))
655 goto nomatch;
656
657 if (match_key("KERNEL", rule, &rule->kernel, udev->dev->kernel))
658 goto nomatch;
659
660 if (match_key("SUBSYSTEM", rule, &rule->subsystem, udev->dev->subsystem))
661 goto nomatch;
662
663 if (match_key("DEVPATH", rule, &rule->devpath, udev->dev->devpath))
664 goto nomatch;
665
666 if (match_key("DRIVER", rule, &rule->driver, udev->dev->driver))
667 goto nomatch;
668
669 /* match NAME against a value assigned by an earlier rule */
670 if (match_key("NAME", rule, &rule->name, udev->name))
671 goto nomatch;
672
673 for (i = 0; i < rule->env.count; i++) {
674 struct key_pair *pair = &rule->env.keys[i];
675
676 /* we only check for matches, assignments will be handled later */
677 if (pair->key.operation == KEY_OP_MATCH ||
678 pair->key.operation == KEY_OP_NOMATCH) {
679 const char *key_name = key_pair_name(rule, pair);
680 const char *value = getenv(key_name);
681
682 if (!value) {
683 dbg("ENV{'%s'} is not set, treat as empty", key_name);
684 value = "";
685 }
686 if (match_key("ENV", rule, &pair->key, value))
687 goto nomatch;
688 }
689 }
690
691 if (rule->test.operation != KEY_OP_UNSET) {
692 char filename[PATH_SIZE];
693 char devpath[PATH_SIZE];
694 char *attr;
695 struct stat statbuf;
696 int match;
697
698 strlcpy(filename, key_val(rule, &rule->test), sizeof(filename));
699 udev_rules_apply_format(udev, filename, sizeof(filename));
700
701 if (attr_get_by_subsys_id(filename, devpath, sizeof(devpath), &attr)) {
702 strlcpy(filename, sysfs_path, sizeof(filename));
703 strlcat(filename, devpath, sizeof(filename));
704 if (attr != NULL) {
705 strlcat(filename, "/", sizeof(filename));
706 strlcat(filename, attr, sizeof(filename));
707 }
708 }
709
710 match = (stat(filename, &statbuf) == 0);
711 info("'%s' %s", filename, match ? "exists" : "does not exist");
712 if (match && rule->test_mode_mask > 0) {
713 match = ((statbuf.st_mode & rule->test_mode_mask) > 0);
714 info("'%s' has mode=%#o and %s %#o", filename, statbuf.st_mode,
715 match ? "matches" : "does not match",
716 rule->test_mode_mask);
717 }
718 if (match && rule->test.operation == KEY_OP_NOMATCH)
719 goto nomatch;
720 if (!match && rule->test.operation == KEY_OP_MATCH)
721 goto nomatch;
722 dbg("TEST key is true");
723 }
724
725 if (rule->wait_for_sysfs.operation != KEY_OP_UNSET) {
726 int found;
727
728 found = (wait_for_sysfs(udev, key_val(rule, &rule->wait_for_sysfs), 3) == 0);
729 if (!found && (rule->wait_for_sysfs.operation != KEY_OP_NOMATCH))
730 goto nomatch;
731 }
732
733 /* check for matching sysfs attribute pairs */
734 for (i = 0; i < rule->attr.count; i++) {
735 struct key_pair *pair = &rule->attr.keys[i];
736
737 if (pair->key.operation == KEY_OP_MATCH ||
738 pair->key.operation == KEY_OP_NOMATCH) {
739 const char *key_name = key_pair_name(rule, pair);
740 const char *key_value = key_val(rule, &pair->key);
741 char devpath[PATH_SIZE];
742 char *attrib;
743 const char *value = NULL;
744 char val[VALUE_SIZE];
745 size_t len;
746
747 if (attr_get_by_subsys_id(key_name, devpath, sizeof(devpath), &attrib)) {
748 if (attrib != NULL)
749 value = sysfs_attr_get_value(devpath, attrib);
750 else
751 goto nomatch;
752 }
753 if (value == NULL)
754 value = sysfs_attr_get_value(udev->dev->devpath, key_name);
755 if (value == NULL)
756 goto nomatch;
757 strlcpy(val, value, sizeof(val));
758
759 /* strip trailing whitespace of value, if not asked to match for it */
760 len = strlen(key_value);
761 if (len > 0 && !isspace(key_value[len-1])) {
762 len = strlen(val);
763 while (len > 0 && isspace(val[len-1]))
764 val[--len] = '\0';
765 dbg("removed %zi trailing whitespace chars from '%s'", strlen(val)-len, val);
766 }
767
768 if (match_key("ATTR", rule, &pair->key, val))
769 goto nomatch;
770 }
771 }
772
773 /* walk up the chain of parent devices and find a match */
774 udev->dev_parent = udev->dev;
775 while (1) {
776 /* check for matching kernel device name */
777 if (match_key("KERNELS", rule, &rule->kernels, udev->dev_parent->kernel))
778 goto try_parent;
779
780 /* check for matching subsystem value */
781 if (match_key("SUBSYSTEMS", rule, &rule->subsystems, udev->dev_parent->subsystem))
782 goto try_parent;
783
784 /* check for matching driver */
785 if (match_key("DRIVERS", rule, &rule->drivers, udev->dev_parent->driver))
786 goto try_parent;
787
788 /* check for matching sysfs attribute pairs */
789 for (i = 0; i < rule->attrs.count; i++) {
790 struct key_pair *pair = &rule->attrs.keys[i];
791
792 if (pair->key.operation == KEY_OP_MATCH ||
793 pair->key.operation == KEY_OP_NOMATCH) {
794 const char *key_name = key_pair_name(rule, pair);
795 const char *key_value = key_val(rule, &pair->key);
796 const char *value;
797 char val[VALUE_SIZE];
798 size_t len;
799
800 value = sysfs_attr_get_value(udev->dev_parent->devpath, key_name);
801 if (value == NULL)
802 value = sysfs_attr_get_value(udev->dev->devpath, key_name);
803 if (value == NULL)
804 goto try_parent;
805 strlcpy(val, value, sizeof(val));
806
807 /* strip trailing whitespace of value, if not asked to match for it */
808 len = strlen(key_value);
809 if (len > 0 && !isspace(key_value[len-1])) {
810 len = strlen(val);
811 while (len > 0 && isspace(val[len-1]))
812 val[--len] = '\0';
813 dbg("removed %zi trailing whitespace chars from '%s'", strlen(val)-len, val);
814 }
815
816 if (match_key("ATTRS", rule, &pair->key, val))
817 goto try_parent;
818 }
819 }
820
821 /* found matching device */
822 break;
823 try_parent:
824 /* move to parent device */
825 dbg("try parent sysfs device");
826 udev->dev_parent = sysfs_device_get_parent(udev->dev_parent);
827 if (udev->dev_parent == NULL)
828 goto nomatch;
829 dbg("looking at dev_parent->devpath='%s'", udev->dev_parent->devpath);
830 dbg("looking at dev_parent->kernel='%s'", udev->dev_parent->kernel);
831 }
832
833 /* execute external program */
834 if (rule->program.operation != KEY_OP_UNSET) {
835 char program[PATH_SIZE];
836 char result[PATH_SIZE];
837
838 strlcpy(program, key_val(rule, &rule->program), sizeof(program));
839 udev_rules_apply_format(udev, program, sizeof(program));
840 if (run_program(program, udev->dev->subsystem, result, sizeof(result),
841 NULL, (udev_log_priority >= LOG_INFO)) != 0) {
842 dbg("PROGRAM is false");
843 udev->program_result[0] = '\0';
844 if (rule->program.operation != KEY_OP_NOMATCH)
845 goto nomatch;
846 } else {
847 int count;
848
849 dbg("PROGRAM matches");
850 remove_trailing_chars(result, '\n');
851 if (rule->string_escape == ESCAPE_UNSET ||
852 rule->string_escape == ESCAPE_REPLACE) {
853 count = replace_chars(result, ALLOWED_CHARS_INPUT);
854 if (count > 0)
855 info("%i character(s) replaced" , count);
856 }
857 dbg("result is '%s'", result);
858 strlcpy(udev->program_result, result, sizeof(udev->program_result));
859 dbg("PROGRAM returned successful");
860 if (rule->program.operation == KEY_OP_NOMATCH)
861 goto nomatch;
862 }
863 dbg("PROGRAM key is true");
864 }
865
866 /* check for matching result of external program */
867 if (match_key("RESULT", rule, &rule->result, udev->program_result))
868 goto nomatch;
869
870 /* import variables returned from program or or file into environment */
871 if (rule->import.operation != KEY_OP_UNSET) {
872 char import[PATH_SIZE];
873 int rc = -1;
874
875 strlcpy(import, key_val(rule, &rule->import), sizeof(import));
876 udev_rules_apply_format(udev, import, sizeof(import));
877 dbg("check for IMPORT import='%s'", import);
878 if (rule->import_type == IMPORT_PROGRAM) {
879 rc = import_program_into_env(udev, import);
880 } else if (rule->import_type == IMPORT_FILE) {
881 dbg("import file import='%s'", import);
882 rc = import_file_into_env(udev, import);
883 } else if (rule->import_type == IMPORT_PARENT) {
884 dbg("import parent import='%s'", import);
885 rc = import_parent_into_env(udev, import);
886 }
887 if (rc != 0) {
888 dbg("IMPORT failed");
889 if (rule->import.operation != KEY_OP_NOMATCH)
890 goto nomatch;
891 } else
892 dbg("IMPORT '%s' imported", key_val(rule, &rule->import));
893 dbg("IMPORT key is true");
894 }
895
896 /* rule matches, if we have ENV assignments export it */
897 for (i = 0; i < rule->env.count; i++) {
898 struct key_pair *pair = &rule->env.keys[i];
899
900 if (pair->key.operation == KEY_OP_ASSIGN) {
901 char temp_value[NAME_SIZE];
902 const char *key_name = key_pair_name(rule, pair);
903 const char *value = key_val(rule, &pair->key);
904
905 /* make sure we don't write to the same string we possibly read from */
906 strlcpy(temp_value, value, sizeof(temp_value));
907 udev_rules_apply_format(udev, temp_value, NAME_SIZE);
908
909 if (temp_value[0] == '\0') {
910 name_list_key_remove(&udev->env_list, key_name);
911 unsetenv(key_name);
912 info("unset ENV '%s'", key_name);
913 } else {
914 char *key_value = name_list_key_add(&udev->env_list, key_name, temp_value);
915
916 if (key_value == NULL)
917 break;
918 putenv(key_value);
919 info("set ENV '%s'", key_value);
920 }
921 }
922 }
923
924 /* if we have ATTR assignments, write value to sysfs file */
925 for (i = 0; i < rule->attr.count; i++) {
926 struct key_pair *pair = &rule->attr.keys[i];
927
928 if (pair->key.operation == KEY_OP_ASSIGN) {
929 const char *key_name = key_pair_name(rule, pair);
930 char devpath[PATH_SIZE];
931 char *attrib;
932 char attr[PATH_SIZE] = "";
933 char value[NAME_SIZE];
934 FILE *f;
935
936 if (attr_get_by_subsys_id(key_name, devpath, sizeof(devpath), &attrib)) {
937 if (attrib != NULL) {
938 strlcpy(attr, sysfs_path, sizeof(attr));
939 strlcat(attr, devpath, sizeof(attr));
940 strlcat(attr, "/", sizeof(attr));
941 strlcat(attr, attrib, sizeof(attr));
942 }
943 }
944
945 if (attr[0] == '\0') {
946 strlcpy(attr, sysfs_path, sizeof(attr));
947 strlcat(attr, udev->dev->devpath, sizeof(attr));
948 strlcat(attr, "/", sizeof(attr));
949 strlcat(attr, key_name, sizeof(attr));
950 }
951
952 strlcpy(value, key_val(rule, &pair->key), sizeof(value));
953 udev_rules_apply_format(udev, value, sizeof(value));
954 info("writing '%s' to sysfs file '%s'", value, attr);
955 f = fopen(attr, "w");
956 if (f != NULL) {
957 if (!udev->test_run)
958 if (fprintf(f, "%s", value) <= 0)
959 err("error writing ATTR{%s}: %s", attr, strerror(errno));
960 fclose(f);
961 } else
962 err("error opening ATTR{%s} for writing: %s", attr, strerror(errno));
963 }
964 }
965 return 0;
966
967 nomatch:
968 return -1;
969 }
970
971 int udev_rules_get_name(struct udev_rules *rules, struct udevice *udev)
972 {
973 struct udev_rule *rule;
974 int name_set = 0;
975
976 dbg("udev->dev->devpath='%s'", udev->dev->devpath);
977 dbg("udev->dev->kernel='%s'", udev->dev->kernel);
978
979 /* look for a matching rule to apply */
980 udev_rules_iter_init(rules);
981 while (1) {
982 rule = udev_rules_iter_next(rules);
983 if (rule == NULL)
984 break;
985
986 if (name_set &&
987 (rule->name.operation == KEY_OP_ASSIGN ||
988 rule->name.operation == KEY_OP_ASSIGN_FINAL ||
989 rule->name.operation == KEY_OP_ADD)) {
990 dbg("node name already set, rule ignored");
991 continue;
992 }
993
994 dbg("process rule");
995 if (match_rule(udev, rule) == 0) {
996 /* apply options */
997 if (rule->ignore_device) {
998 info("rule applied, '%s' is ignored", udev->dev->kernel);
999 udev->ignore_device = 1;
1000 return 0;
1001 }
1002 if (rule->ignore_remove) {
1003 udev->ignore_remove = 1;
1004 dbg("remove event should be ignored");
1005 }
1006 if (rule->link_priority != 0) {
1007 udev->link_priority = rule->link_priority;
1008 info("link_priority=%i", udev->link_priority);
1009 }
1010 /* apply all_partitions option only at a main block device */
1011 if (rule->partitions &&
1012 strcmp(udev->dev->subsystem, "block") == 0 && udev->dev->kernel_number[0] == '\0') {
1013 udev->partitions = rule->partitions;
1014 dbg("creation of partition nodes requested");
1015 }
1016
1017 /* apply permissions */
1018 if (!udev->mode_final && rule->mode != 0000) {
1019 if (rule->mode_operation == KEY_OP_ASSIGN_FINAL)
1020 udev->mode_final = 1;
1021 udev->mode = rule->mode;
1022 dbg("applied mode=%#o to '%s'", rule->mode, udev->dev->kernel);
1023 }
1024 if (!udev->owner_final && rule->owner.operation != KEY_OP_UNSET) {
1025 if (rule->owner.operation == KEY_OP_ASSIGN_FINAL)
1026 udev->owner_final = 1;
1027 strlcpy(udev->owner, key_val(rule, &rule->owner), sizeof(udev->owner));
1028 udev_rules_apply_format(udev, udev->owner, sizeof(udev->owner));
1029 dbg("applied owner='%s' to '%s'", udev->owner, udev->dev->kernel);
1030 }
1031 if (!udev->group_final && rule->group.operation != KEY_OP_UNSET) {
1032 if (rule->group.operation == KEY_OP_ASSIGN_FINAL)
1033 udev->group_final = 1;
1034 strlcpy(udev->group, key_val(rule, &rule->group), sizeof(udev->group));
1035 udev_rules_apply_format(udev, udev->group, sizeof(udev->group));
1036 dbg("applied group='%s' to '%s'", udev->group, udev->dev->kernel);
1037 }
1038
1039 /* collect symlinks */
1040 if (!udev->symlink_final && rule->symlink.operation != KEY_OP_UNSET) {
1041 char temp[PATH_SIZE];
1042 char *pos, *next;
1043 int count;
1044
1045 if (rule->symlink.operation == KEY_OP_ASSIGN_FINAL)
1046 udev->symlink_final = 1;
1047 if (rule->symlink.operation == KEY_OP_ASSIGN || rule->symlink.operation == KEY_OP_ASSIGN_FINAL) {
1048 info("reset symlink list");
1049 name_list_cleanup(&udev->symlink_list);
1050 }
1051 /* allow multiple symlinks separated by spaces */
1052 strlcpy(temp, key_val(rule, &rule->symlink), sizeof(temp));
1053 udev_rules_apply_format(udev, temp, sizeof(temp));
1054 if (rule->string_escape == ESCAPE_UNSET ||
1055 rule->string_escape == ESCAPE_REPLACE) {
1056 count = replace_chars(temp, ALLOWED_CHARS_FILE " ");
1057 if (count > 0)
1058 info("%i character(s) replaced" , count);
1059 }
1060 dbg("rule applied, added symlink(s) '%s'", temp);
1061 pos = temp;
1062 while (isspace(pos[0]))
1063 pos++;
1064 next = strchr(pos, ' ');
1065 while (next) {
1066 next[0] = '\0';
1067 info("add symlink '%s'", pos);
1068 name_list_add(&udev->symlink_list, pos, 0);
1069 while (isspace(next[1]))
1070 next++;
1071 pos = &next[1];
1072 next = strchr(pos, ' ');
1073 }
1074 if (pos[0] != '\0') {
1075 info("add symlink '%s'", pos);
1076 name_list_add(&udev->symlink_list, pos, 0);
1077 }
1078 }
1079
1080 /* set name, later rules with name set will be ignored */
1081 if (rule->name.operation == KEY_OP_ASSIGN ||
1082 rule->name.operation == KEY_OP_ASSIGN_FINAL ||
1083 rule->name.operation == KEY_OP_ADD) {
1084 int count;
1085
1086 name_set = 1;
1087 strlcpy(udev->name, key_val(rule, &rule->name), sizeof(udev->name));
1088 udev_rules_apply_format(udev, udev->name, sizeof(udev->name));
1089 if (rule->string_escape == ESCAPE_UNSET ||
1090 rule->string_escape == ESCAPE_REPLACE) {
1091 count = replace_chars(udev->name, ALLOWED_CHARS_FILE);
1092 if (count > 0)
1093 info("%i character(s) replaced", count);
1094 }
1095
1096 info("rule applied, '%s' becomes '%s'", udev->dev->kernel, udev->name);
1097 if (strcmp(udev->dev->subsystem, "net") != 0)
1098 dbg("name, '%s' is going to have owner='%s', group='%s', mode=%#o partitions=%i",
1099 udev->name, udev->owner, udev->group, udev->mode, udev->partitions);
1100 }
1101
1102 if (!udev->run_final && rule->run.operation != KEY_OP_UNSET) {
1103 if (rule->run.operation == KEY_OP_ASSIGN_FINAL)
1104 udev->run_final = 1;
1105 if (rule->run.operation == KEY_OP_ASSIGN || rule->run.operation == KEY_OP_ASSIGN_FINAL) {
1106 info("reset run list");
1107 name_list_cleanup(&udev->run_list);
1108 }
1109 dbg("add run '%s'", key_val(rule, &rule->run));
1110 name_list_add(&udev->run_list, key_val(rule, &rule->run), 0);
1111 }
1112
1113 if (rule->last_rule) {
1114 dbg("last rule to be applied");
1115 break;
1116 }
1117
1118 if (rule->goto_label.operation != KEY_OP_UNSET) {
1119 dbg("moving forward to label '%s'", key_val(rule, &rule->goto_label));
1120 udev_rules_iter_label(rules, key_val(rule, &rule->goto_label));
1121 }
1122 }
1123 }
1124
1125 if (!name_set) {
1126 strlcpy(udev->name, udev->dev->kernel, sizeof(udev->name));
1127 info("no node name set, will use kernel name '%s'", udev->name);
1128 }
1129
1130 if (udev->tmp_node[0] != '\0') {
1131 dbg("removing temporary device node");
1132 unlink_secure(udev->tmp_node);
1133 udev->tmp_node[0] = '\0';
1134 }
1135
1136 return 0;
1137 }
1138
1139 int udev_rules_get_run(struct udev_rules *rules, struct udevice *udev)
1140 {
1141 struct udev_rule *rule;
1142
1143 dbg("udev->kernel='%s'", udev->dev->kernel);
1144
1145 /* look for a matching rule to apply */
1146 udev_rules_iter_init(rules);
1147 while (1) {
1148 rule = udev_rules_iter_next(rules);
1149 if (rule == NULL)
1150 break;
1151
1152 dbg("process rule");
1153 if (rule->name.operation != KEY_OP_UNSET || rule->symlink.operation != KEY_OP_UNSET ||
1154 rule->mode_operation != KEY_OP_UNSET || rule->owner.operation != KEY_OP_UNSET ||
1155 rule->group.operation != KEY_OP_UNSET) {
1156 dbg("skip rule that names a device");
1157 continue;
1158 }
1159
1160 if (match_rule(udev, rule) == 0) {
1161 if (rule->ignore_device) {
1162 info("rule applied, '%s' is ignored", udev->dev->kernel);
1163 udev->ignore_device = 1;
1164 return 0;
1165 }
1166
1167 if (!udev->run_final && rule->run.operation != KEY_OP_UNSET) {
1168 if (rule->run.operation == KEY_OP_ASSIGN ||
1169 rule->run.operation == KEY_OP_ASSIGN_FINAL) {
1170 info("reset run list");
1171 name_list_cleanup(&udev->run_list);
1172 }
1173 dbg("add run '%s'", key_val(rule, &rule->run));
1174 name_list_add(&udev->run_list, key_val(rule, &rule->run), 0);
1175 if (rule->run.operation == KEY_OP_ASSIGN_FINAL)
1176 break;
1177 }
1178
1179 if (rule->last_rule) {
1180 dbg("last rule to be applied");
1181 break;
1182 }
1183
1184 if (rule->goto_label.operation != KEY_OP_UNSET) {
1185 dbg("moving forward to label '%s'", key_val(rule, &rule->goto_label));
1186 udev_rules_iter_label(rules, key_val(rule, &rule->goto_label));
1187 }
1188 }
1189 }
1190
1191 return 0;
1192 }
Tomato firmware and modifications.