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dnscrypto-proxy: Support files updated.
[tomato.git] / release / src / router / udev / udev_rules_parse.c
blob9a12d53816e59f4dfaa50d3add57e4c243f5c925
1 /*
2 * Copyright (C) 2003,2004 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 <ctype.h>
25 #include <unistd.h>
26 #include <sys/stat.h>
27 #include <errno.h>
28
29 #include "udev.h"
30 #include "udev_rules.h"
31
32
33 void udev_rules_iter_init(struct udev_rules *rules)
34 {
35 dbg("bufsize=%zi", rules->bufsize);
36 rules->current = 0;
37 }
38
39 struct udev_rule *udev_rules_iter_next(struct udev_rules *rules)
40 {
41 static struct udev_rule *rule;
42
43 if (!rules)
44 return NULL;
45
46 dbg("current=%zi", rules->current);
47 if (rules->current >= rules->bufsize) {
48 dbg("no more rules");
49 return NULL;
50 }
51
52 /* get next rule */
53 rule = (struct udev_rule *) (rules->buf + rules->current);
54 rules->current += sizeof(struct udev_rule) + rule->bufsize;
55
56 return rule;
57 }
58
59 struct udev_rule *udev_rules_iter_label(struct udev_rules *rules, const char *label)
60 {
61 static struct udev_rule *rule;
62
63 next:
64 dbg("current=%zi", rules->current);
65 if (rules->current >= rules->bufsize) {
66 dbg("no more rules");
67 return NULL;
68 }
69 rule = (struct udev_rule *) (rules->buf + rules->current);
70
71 if (strcmp(&rule->buf[rule->label.val_off], label) != 0) {
72 dbg("moving forward, looking for label '%s'", label);
73 rules->current += sizeof(struct udev_rule) + rule->bufsize;
74 goto next;
75 }
76
77 dbg("found label '%s'", label);
78 return rule;
79 }
80
81 static int get_key(char **line, char **key, enum key_operation *operation, char **value)
82 {
83 char *linepos;
84 char *temp;
85
86 linepos = *line;
87 if (linepos == NULL && linepos[0] == '\0')
88 return -1;
89
90 /* skip whitespace */
91 while (isspace(linepos[0]) || linepos[0] == ',')
92 linepos++;
93
94 /* get the key */
95 if (linepos[0] == '\0')
96 return -1;
97 *key = linepos;
98
99 while (1) {
100 linepos++;
101 if (linepos[0] == '\0')
102 return -1;
103 if (isspace(linepos[0]))
104 break;
105 if (linepos[0] == '=')
106 break;
107 if ((linepos[0] == '+') || (linepos[0] == '!') || (linepos[0] == ':'))
108 if (linepos[1] == '=')
109 break;
110 }
111
112 /* remember end of key */
113 temp = linepos;
114
115 /* skip whitespace after key */
116 while (isspace(linepos[0]))
117 linepos++;
118 if (linepos[0] == '\0')
119 return -1;
120
121 /* get operation type */
122 if (linepos[0] == '=' && linepos[1] == '=') {
123 *operation = KEY_OP_MATCH;
124 linepos += 2;
125 dbg("operator=match");
126 } else if (linepos[0] == '!' && linepos[1] == '=') {
127 *operation = KEY_OP_NOMATCH;
128 linepos += 2;
129 dbg("operator=nomatch");
130 } else if (linepos[0] == '+' && linepos[1] == '=') {
131 *operation = KEY_OP_ADD;
132 linepos += 2;
133 dbg("operator=add");
134 } else if (linepos[0] == '=') {
135 *operation = KEY_OP_ASSIGN;
136 linepos++;
137 dbg("operator=assign");
138 } else if (linepos[0] == ':' && linepos[1] == '=') {
139 *operation = KEY_OP_ASSIGN_FINAL;
140 linepos += 2;
141 dbg("operator=assign_final");
142 } else
143 return -1;
144
145 /* terminate key */
146 temp[0] = '\0';
147 dbg("key='%s'", *key);
148
149 /* skip whitespace after operator */
150 while (isspace(linepos[0]))
151 linepos++;
152 if (linepos[0] == '\0')
153 return -1;
154
155 /* get the value*/
156 if (linepos[0] == '"')
157 linepos++;
158 else
159 return -1;
160 *value = linepos;
161
162 temp = strchr(linepos, '"');
163 if (!temp)
164 return -1;
165 temp[0] = '\0';
166 temp++;
167 dbg("value='%s'", *value);
168
169 /* move line to next key */
170 *line = temp;
171
172 return 0;
173 }
174
175 /* extract possible KEY{attr} */
176 static char *get_key_attribute(char *str)
177 {
178 char *pos;
179 char *attr;
180
181 attr = strchr(str, '{');
182 if (attr != NULL) {
183 attr++;
184 pos = strchr(attr, '}');
185 if (pos == NULL) {
186 err("missing closing brace for format");
187 return NULL;
188 }
189 pos[0] = '\0';
190 dbg("attribute='%s'", attr);
191 return attr;
192 }
193
194 return NULL;
195 }
196
197 static int add_rule_key(struct udev_rule *rule, struct key *key,
198 enum key_operation operation, const char *value)
199 {
200 size_t val_len = strnlen(value, PATH_SIZE);
201
202 key->operation = operation;
203
204 key->val_off = rule->bufsize;
205 strlcpy(rule->buf + rule->bufsize, value, val_len+1);
206 rule->bufsize += val_len+1;
207
208 return 0;
209 }
210
211 static int add_rule_key_pair(struct udev_rule *rule, struct key_pairs *pairs,
212 enum key_operation operation, const char *key, const char *value)
213 {
214 size_t key_len = strnlen(key, PATH_SIZE);
215
216 if (pairs->count >= PAIRS_MAX) {
217 err("skip, too many keys of the same type in a single rule");
218 return -1;
219 }
220
221 add_rule_key(rule, &pairs->keys[pairs->count].key, operation, value);
222
223 /* add the key-name of the pair */
224 pairs->keys[pairs->count].key_name_off = rule->bufsize;
225 strlcpy(rule->buf + rule->bufsize, key, key_len+1);
226 rule->bufsize += key_len+1;
227
228 pairs->count++;
229
230 return 0;
231 }
232
233 static int add_to_rules(struct udev_rules *rules, char *line, const char *filename, unsigned int lineno)
234 {
235 char buf[sizeof(struct udev_rule) + LINE_SIZE];
236 struct udev_rule *rule;
237 size_t rule_size;
238 int valid;
239 char *linepos;
240 char *attr;
241 size_t padding;
242 int physdev = 0;
243 int retval;
244
245 memset(buf, 0x00, sizeof(buf));
246 rule = (struct udev_rule *) buf;
247 linepos = line;
248 valid = 0;
249
250 /* get all the keys */
251 while (1) {
252 char *key;
253 char *value;
254 enum key_operation operation = KEY_OP_UNSET;
255
256 retval = get_key(&linepos, &key, &operation, &value);
257 if (retval)
258 break;
259
260 if (strcasecmp(key, "ACTION") == 0) {
261 if (operation != KEY_OP_MATCH &&
262 operation != KEY_OP_NOMATCH) {
263 err("invalid ACTION operation");
264 goto invalid;
265 }
266 add_rule_key(rule, &rule->action, operation, value);
267 valid = 1;
268 continue;
269 }
270
271 if (strcasecmp(key, "DEVPATH") == 0) {
272 if (operation != KEY_OP_MATCH &&
273 operation != KEY_OP_NOMATCH) {
274 err("invalid DEVPATH operation");
275 goto invalid;
276 }
277 add_rule_key(rule, &rule->devpath, operation, value);
278 valid = 1;
279 continue;
280 }
281
282 if (strcasecmp(key, "KERNEL") == 0) {
283 if (operation != KEY_OP_MATCH &&
284 operation != KEY_OP_NOMATCH) {
285 err("invalid KERNEL operation");
286 goto invalid;
287 }
288 add_rule_key(rule, &rule->kernel, operation, value);
289 valid = 1;
290 continue;
291 }
292
293 if (strcasecmp(key, "SUBSYSTEM") == 0) {
294 if (operation != KEY_OP_MATCH &&
295 operation != KEY_OP_NOMATCH) {
296 err("invalid SUBSYSTEM operation");
297 goto invalid;
298 }
299 /* bus, class, subsystem events should all be the same */
300 if (strcmp(value, "subsystem") == 0 ||
301 strcmp(value, "bus") == 0 ||
302 strcmp(value, "class") == 0) {
303 if (strcmp(value, "bus") == 0 || strcmp(value, "class") == 0)
304 err("'%s' must be specified as 'subsystem' "
305 "please fix it in %s:%u", value, filename, lineno);
306 add_rule_key(rule, &rule->subsystem, operation, "subsystem|class|bus");
307 } else
308 add_rule_key(rule, &rule->subsystem, operation, value);
309 valid = 1;
310 continue;
311 }
312
313 if (strcasecmp(key, "DRIVER") == 0) {
314 if (operation != KEY_OP_MATCH &&
315 operation != KEY_OP_NOMATCH) {
316 err("invalid DRIVER operation");
317 goto invalid;
318 }
319 add_rule_key(rule, &rule->driver, operation, value);
320 valid = 1;
321 continue;
322 }
323
324 if (strncasecmp(key, "ATTR{", sizeof("ATTR{")-1) == 0) {
325 attr = get_key_attribute(key + sizeof("ATTR")-1);
326 if (attr == NULL) {
327 err("error parsing ATTR attribute");
328 goto invalid;
329 }
330 if (add_rule_key_pair(rule, &rule->attr, operation, attr, value) != 0)
331 goto invalid;
332 valid = 1;
333 continue;
334 }
335
336 if (strcasecmp(key, "KERNELS") == 0 ||
337 strcasecmp(key, "ID") == 0) {
338 if (operation != KEY_OP_MATCH &&
339 operation != KEY_OP_NOMATCH) {
340 err("invalid KERNELS operation");
341 goto invalid;
342 }
343 add_rule_key(rule, &rule->kernels, operation, value);
344 valid = 1;
345 continue;
346 }
347
348 if (strcasecmp(key, "SUBSYSTEMS") == 0 ||
349 strcasecmp(key, "BUS") == 0) {
350 if (operation != KEY_OP_MATCH &&
351 operation != KEY_OP_NOMATCH) {
352 err("invalid SUBSYSTEMS operation");
353 goto invalid;
354 }
355 add_rule_key(rule, &rule->subsystems, operation, value);
356 valid = 1;
357 continue;
358 }
359
360 if (strcasecmp(key, "DRIVERS") == 0) {
361 if (operation != KEY_OP_MATCH &&
362 operation != KEY_OP_NOMATCH) {
363 err("invalid DRIVERS operation");
364 goto invalid;
365 }
366 add_rule_key(rule, &rule->drivers, operation, value);
367 valid = 1;
368 continue;
369 }
370
371 if (strncasecmp(key, "ATTRS{", sizeof("ATTRS{")-1) == 0 ||
372 strncasecmp(key, "SYSFS{", sizeof("SYSFS{")-1) == 0) {
373 if (operation != KEY_OP_MATCH &&
374 operation != KEY_OP_NOMATCH) {
375 err("invalid ATTRS operation");
376 goto invalid;
377 }
378 attr = get_key_attribute(key + sizeof("ATTRS")-1);
379 if (attr == NULL) {
380 err("error parsing ATTRS attribute");
381 goto invalid;
382 }
383 if (strncmp(attr, "device/", 7) == 0)
384 err("the 'device' link is deprecated and will be removed from a future kernel, "
385 "please fix it in %s:%u", filename, lineno);
386 else if (strstr(attr, "../") != NULL)
387 err("do not reference parent sysfs directories directly, that may break with a future kernel, "
388 "please fix it in %s:%u", filename, lineno);
389 if (add_rule_key_pair(rule, &rule->attrs, operation, attr, value) != 0)
390 goto invalid;
391 valid = 1;
392 continue;
393 }
394
395 if (strncasecmp(key, "ENV{", sizeof("ENV{")-1) == 0) {
396 attr = get_key_attribute(key + sizeof("ENV")-1);
397 if (attr == NULL) {
398 err("error parsing ENV attribute");
399 goto invalid;
400 }
401 if (strncmp(attr, "PHYSDEV", 7) == 0)
402 physdev = 1;
403 if (add_rule_key_pair(rule, &rule->env, operation, attr, value) != 0)
404 goto invalid;
405 valid = 1;
406 continue;
407 }
408
409 if (strcasecmp(key, "PROGRAM") == 0) {
410 add_rule_key(rule, &rule->program, operation, value);
411 valid = 1;
412 continue;
413 }
414
415 if (strcasecmp(key, "RESULT") == 0) {
416 if (operation != KEY_OP_MATCH &&
417 operation != KEY_OP_NOMATCH) {
418 err("invalid RESULT operation");
419 goto invalid;
420 }
421 add_rule_key(rule, &rule->result, operation, value);
422 valid = 1;
423 continue;
424 }
425
426 if (strncasecmp(key, "IMPORT", sizeof("IMPORT")-1) == 0) {
427 attr = get_key_attribute(key + sizeof("IMPORT")-1);
428 if (attr && strstr(attr, "program")) {
429 dbg("IMPORT will be executed");
430 rule->import_type = IMPORT_PROGRAM;
431 } else if (attr && strstr(attr, "file")) {
432 dbg("IMPORT will be included as file");
433 rule->import_type = IMPORT_FILE;
434 } else if (attr && strstr(attr, "parent")) {
435 dbg("IMPORT will include the parent values");
436 rule->import_type = IMPORT_PARENT;
437 } else {
438 /* figure it out if it is executable */
439 char file[PATH_SIZE];
440 char *pos;
441 struct stat stats;
442
443 strlcpy(file, value, sizeof(file));
444 pos = strchr(file, ' ');
445 if (pos)
446 pos[0] = '\0';
447
448 /* allow programs in /lib/udev called without the path */
449 if (strchr(file, '/') == NULL) {
450 strlcpy(file, "/lib/udev/", sizeof(file));
451 strlcat(file, value, sizeof(file));
452 pos = strchr(file, ' ');
453 if (pos)
454 pos[0] = '\0';
455 }
456
457 dbg("IMPORT auto mode for '%s'", file);
458 if (!lstat(file, &stats) && (stats.st_mode & S_IXUSR)) {
459 dbg("IMPORT is executable, will be executed (autotype)");
460 rule->import_type = IMPORT_PROGRAM;
461 } else {
462 dbg("IMPORT is not executable, will be included as file (autotype)");
463 rule->import_type = IMPORT_FILE;
464 }
465 }
466 add_rule_key(rule, &rule->import, operation, value);
467 valid = 1;
468 continue;
469 }
470
471 if (strncasecmp(key, "TEST", sizeof("TEST")-1) == 0) {
472 attr = get_key_attribute(key + sizeof("TEST")-1);
473 if (attr != NULL)
474 rule->test_mode_mask = strtol(attr, NULL, 8);
475 add_rule_key(rule, &rule->test, operation, value);
476 valid = 1;
477 continue;
478 }
479
480 if (strcasecmp(key, "RUN") == 0) {
481 add_rule_key(rule, &rule->run, operation, value);
482 valid = 1;
483 continue;
484 }
485
486 if (strcasecmp(key, "WAIT_FOR_SYSFS") == 0) {
487 add_rule_key(rule, &rule->wait_for_sysfs, operation, value);
488 valid = 1;
489 continue;
490 }
491
492 if (strcasecmp(key, "LABEL") == 0) {
493 add_rule_key(rule, &rule->label, operation, value);
494 valid = 1;
495 continue;
496 }
497
498 if (strcasecmp(key, "GOTO") == 0) {
499 add_rule_key(rule, &rule->goto_label, operation, value);
500 valid = 1;
501 continue;
502 }
503
504 if (strncasecmp(key, "NAME", sizeof("NAME")-1) == 0) {
505 attr = get_key_attribute(key + sizeof("NAME")-1);
506 if (attr != NULL) {
507 if (strstr(attr, "all_partitions") != NULL) {
508 dbg("creation of partition nodes requested");
509 rule->partitions = DEFAULT_PARTITIONS_COUNT;
510 }
511 if (strstr(attr, "ignore_remove") != NULL) {
512 dbg("remove event should be ignored");
513 rule->ignore_remove = 1;
514 }
515 }
516 if (value[0] == '\0')
517 dbg("name empty, node creation supressed");
518 add_rule_key(rule, &rule->name, operation, value);
519 continue;
520 }
521
522 if (strcasecmp(key, "SYMLINK") == 0) {
523 add_rule_key(rule, &rule->symlink, operation, value);
524 valid = 1;
525 continue;
526 }
527
528 if (strcasecmp(key, "OWNER") == 0) {
529 valid = 1;
530 if (rules->resolve_names && (!strchr(value, '$') && !strchr(value, '%'))) {
531 char *endptr;
532 strtoul(value, &endptr, 10);
533 if (endptr[0] != '\0') {
534 char owner[32];
535 uid_t uid = lookup_user(value);
536 dbg("replacing username='%s' by id=%i", value, uid);
537 sprintf(owner, "%u", (unsigned int) uid);
538 add_rule_key(rule, &rule->owner, operation, owner);
539 continue;
540 }
541 }
542
543 add_rule_key(rule, &rule->owner, operation, value);
544 continue;
545 }
546
547 if (strcasecmp(key, "GROUP") == 0) {
548 valid = 1;
549 if (rules->resolve_names && (!strchr(value, '$') && !strchr(value, '%'))) {
550 char *endptr;
551 strtoul(value, &endptr, 10);
552 if (endptr[0] != '\0') {
553 char group[32];
554 gid_t gid = lookup_group(value);
555 dbg("replacing groupname='%s' by id=%i", value, gid);
556 sprintf(group, "%u", (unsigned int) gid);
557 add_rule_key(rule, &rule->group, operation, group);
558 continue;
559 }
560 }
561
562 add_rule_key(rule, &rule->group, operation, value);
563 continue;
564 }
565
566 if (strcasecmp(key, "MODE") == 0) {
567 rule->mode = strtol(value, NULL, 8);
568 rule->mode_operation = operation;
569 valid = 1;
570 continue;
571 }
572
573 if (strcasecmp(key, "OPTIONS") == 0) {
574 const char *pos;
575
576 if (strstr(value, "last_rule") != NULL) {
577 dbg("last rule to be applied");
578 rule->last_rule = 1;
579 }
580 if (strstr(value, "ignore_device") != NULL) {
581 dbg("device should be ignored");
582 rule->ignore_device = 1;
583 }
584 if (strstr(value, "ignore_remove") != NULL) {
585 dbg("remove event should be ignored");
586 rule->ignore_remove = 1;
587 }
588 pos = strstr(value, "link_priority=");
589 if (pos != NULL) {
590 rule->link_priority = atoi(&pos[strlen("link_priority=")]);
591 info("link priority=%i", rule->link_priority);
592 }
593 pos = strstr(value, "string_escape=");
594 if (pos != NULL) {
595 pos = &pos[strlen("string_escape=")];
596 if (strncmp(pos, "none", strlen("none")) == 0)
597 rule->string_escape = ESCAPE_NONE;
598 else if (strncmp(pos, "replace", strlen("replace")) == 0)
599 rule->string_escape = ESCAPE_REPLACE;
600 }
601 if (strstr(value, "all_partitions") != NULL) {
602 dbg("creation of partition nodes requested");
603 rule->partitions = DEFAULT_PARTITIONS_COUNT;
604 }
605 valid = 1;
606 continue;
607 }
608
609 err("unknown key '%s' in %s:%u", key, filename, lineno);
610 }
611
612 if (physdev && rule->wait_for_sysfs.operation == KEY_OP_UNSET)
613 err("PHYSDEV* values are deprecated and will be removed from a future kernel, "
614 "please fix it in %s:%u", filename, lineno);
615
616 /* skip line if not any valid key was found */
617 if (!valid)
618 goto invalid;
619
620 /* grow buffer and add rule */
621 rule_size = sizeof(struct udev_rule) + rule->bufsize;
622 padding = (sizeof(size_t) - rule_size % sizeof(size_t)) % sizeof(size_t);
623 dbg("add %zi padding bytes", padding);
624 rule_size += padding;
625 rule->bufsize += padding;
626
627 rules->buf = realloc(rules->buf, rules->bufsize + rule_size);
628 if (!rules->buf) {
629 err("realloc failed");
630 goto exit;
631 }
632 dbg("adding rule to offset %zi", rules->bufsize);
633 memcpy(rules->buf + rules->bufsize, rule, rule_size);
634 rules->bufsize += rule_size;
635 exit:
636 return 0;
637
638 invalid:
639 err("invalid rule '%s:%u'", filename, lineno);
640 return -1;
641 }
642
643 static int parse_file(struct udev_rules *rules, const char *filename)
644 {
645 char line[LINE_SIZE];
646 char *bufline;
647 unsigned int lineno;
648 char *buf;
649 size_t bufsize;
650 size_t cur;
651 size_t count;
652 int retval = 0;
653
654 if (file_map(filename, &buf, &bufsize) != 0) {
655 err("can't open '%s' as rules file: %s", filename, strerror(errno));
656 return -1;
657 }
658 info("reading '%s' as rules file", filename);
659
660 /* loop through the whole file */
661 cur = 0;
662 lineno = 0;
663 while (cur < bufsize) {
664 unsigned int i, j;
665
666 count = buf_get_line(buf, bufsize, cur);
667 bufline = &buf[cur];
668 cur += count+1;
669 lineno++;
670
671 /* eat the whitespace */
672 while ((count > 0) && isspace(bufline[0])) {
673 bufline++;
674 count--;
675 }
676 if (count == 0)
677 continue;
678
679 /* see if this is a comment */
680 if (bufline[0] == COMMENT_CHARACTER)
681 continue;
682
683 if (count >= sizeof(line)) {
684 err("line too long, rule skipped '%s:%u'", filename, lineno);
685 continue;
686 }
687
688 /* skip backslash and newline from multiline rules */
689 for (i = j = 0; i < count; i++) {
690 if (bufline[i] == '\\' && bufline[i+1] == '\n')
691 continue;
692
693 line[j++] = bufline[i];
694 }
695 line[j] = '\0';
696
697 dbg("read '%s'", line);
698 add_to_rules(rules, line, filename, lineno);
699 }
700
701 file_unmap(buf, bufsize);
702 return retval;
703 }
704
705 int udev_rules_init(struct udev_rules *rules, int resolve_names)
706 {
707 struct stat stats;
708 int retval;
709
710 memset(rules, 0x00, sizeof(struct udev_rules));
711 rules->resolve_names = resolve_names;
712
713 /* parse rules file or all matching files in directory */
714 if (stat(udev_rules_dir, &stats) != 0)
715 return -1;
716
717 if ((stats.st_mode & S_IFMT) != S_IFDIR) {
718 dbg("parse single rules file '%s'", udev_rules_dir);
719 retval = parse_file(rules, udev_rules_dir);
720 } else {
721 struct name_entry *name_loop, *name_tmp;
722 LIST_HEAD(name_list);
723
724 dbg("parse rules directory '%s'", udev_rules_dir);
725 retval = add_matching_files(&name_list, udev_rules_dir, RULESFILE_SUFFIX);
726
727 list_for_each_entry_safe(name_loop, name_tmp, &name_list, node) {
728 if (stat(name_loop->name, &stats) == 0) {
729 if (stats.st_size)
730 parse_file(rules, name_loop->name);
731 else
732 dbg("empty rules file '%s'", name_loop->name);
733 } else
734 err("could not read '%s': %s", name_loop->name, strerror(errno));
735 list_del(&name_loop->node);
736 free(name_loop);
737 }
738 }
739
740 return retval;
741 }
742
743 void udev_rules_cleanup(struct udev_rules *rules)
744 {
745 if (rules->buf) {
746 free(rules->buf);
747 rules->buf = NULL;
748 }
749 }
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