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