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[thirdparty/systemd.git] / udev / udev-rules.c
1 /*
2 * Copyright (C) 2003-2010 Kay Sievers <kay.sievers@vrfy.org>
3 * Copyright (C) 2008 Alan Jenkins <alan-jenkins@tuffmail.co.uk>
4 *
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
17 */
18
19 #include <stddef.h>
20 #include <limits.h>
21 #include <stdlib.h>
22 #include <stdbool.h>
23 #include <string.h>
24 #include <stdio.h>
25 #include <fcntl.h>
26 #include <ctype.h>
27 #include <unistd.h>
28 #include <errno.h>
29 #include <dirent.h>
30 #include <fnmatch.h>
31 #include <time.h>
32
33 #include "udev.h"
34
35 #define PREALLOC_TOKEN 2048
36 #define PREALLOC_STRBUF 32 * 1024
37 #define PREALLOC_TRIE 256
38
39 struct uid_gid {
40 unsigned int name_off;
41 union {
42 uid_t uid;
43 gid_t gid;
44 };
45 };
46
47 struct trie_node {
48 /* this node's first child */
49 unsigned int child_idx;
50 /* the next child of our parent node's child list */
51 unsigned int next_child_idx;
52 /* this node's last child (shortcut for append) */
53 unsigned int last_child_idx;
54 unsigned int value_off;
55 unsigned short value_len;
56 unsigned char key;
57 };
58
59 struct udev_rules {
60 struct udev *udev;
61 int resolve_names;
62
63 /* every key in the rules file becomes a token */
64 struct token *tokens;
65 unsigned int token_cur;
66 unsigned int token_max;
67
68 /* all key strings are copied to a single string buffer */
69 char *buf;
70 size_t buf_cur;
71 size_t buf_max;
72 unsigned int buf_count;
73
74 /* during rule parsing, strings are indexed to find duplicates */
75 struct trie_node *trie_nodes;
76 unsigned int trie_nodes_cur;
77 unsigned int trie_nodes_max;
78
79 /* during rule parsing, uid/gid lookup results are cached */
80 struct uid_gid *uids;
81 unsigned int uids_cur;
82 unsigned int uids_max;
83 struct uid_gid *gids;
84 unsigned int gids_cur;
85 unsigned int gids_max;
86 };
87
88 /* KEY=="", KEY!="", KEY+="", KEY="", KEY:="" */
89 enum operation_type {
90 OP_UNSET,
91
92 OP_MATCH,
93 OP_NOMATCH,
94 OP_MATCH_MAX,
95
96 OP_ADD,
97 OP_ASSIGN,
98 OP_ASSIGN_FINAL,
99 };
100
101 enum string_glob_type {
102 GL_UNSET,
103 GL_PLAIN, /* no special chars */
104 GL_GLOB, /* shell globs ?,*,[] */
105 GL_SPLIT, /* multi-value A|B */
106 GL_SPLIT_GLOB, /* multi-value with glob A*|B* */
107 GL_SOMETHING, /* commonly used "?*" */
108 };
109
110 enum string_subst_type {
111 SB_UNSET,
112 SB_NONE,
113 SB_FORMAT,
114 SB_SUBSYS,
115 };
116
117 /* tokens of a rule are sorted/handled in this order */
118 enum token_type {
119 TK_UNSET,
120 TK_RULE,
121
122 TK_M_ACTION, /* val */
123 TK_M_DEVPATH, /* val */
124 TK_M_KERNEL, /* val */
125 TK_M_DEVLINK, /* val */
126 TK_M_NAME, /* val */
127 TK_M_ENV, /* val, attr */
128 TK_M_TAG, /* val */
129 TK_M_SUBSYSTEM, /* val */
130 TK_M_DRIVER, /* val */
131 TK_M_WAITFOR, /* val */
132 TK_M_ATTR, /* val, attr */
133
134 TK_M_PARENTS_MIN,
135 TK_M_KERNELS, /* val */
136 TK_M_SUBSYSTEMS, /* val */
137 TK_M_DRIVERS, /* val */
138 TK_M_ATTRS, /* val, attr */
139 TK_M_PARENTS_MAX,
140
141 TK_M_TEST, /* val, mode_t */
142 TK_M_PROGRAM, /* val */
143 TK_M_IMPORT_FILE, /* val */
144 TK_M_IMPORT_PROG, /* val */
145 TK_M_IMPORT_DB, /* val */
146 TK_M_IMPORT_CMDLINE, /* val */
147 TK_M_IMPORT_PARENT, /* val */
148 TK_M_RESULT, /* val */
149 TK_M_MAX,
150
151 TK_A_STRING_ESCAPE_NONE,
152 TK_A_STRING_ESCAPE_REPLACE,
153 TK_A_INOTIFY_WATCH, /* int */
154 TK_A_DEVLINK_PRIO, /* int */
155 TK_A_OWNER, /* val */
156 TK_A_GROUP, /* val */
157 TK_A_MODE, /* val */
158 TK_A_OWNER_ID, /* uid_t */
159 TK_A_GROUP_ID, /* gid_t */
160 TK_A_MODE_ID, /* mode_t */
161 TK_A_STATIC_NODE, /* val */
162 TK_A_ENV, /* val, attr */
163 TK_A_TAG, /* val */
164 TK_A_NAME, /* val */
165 TK_A_DEVLINK, /* val */
166 TK_A_EVENT_TIMEOUT, /* int */
167 TK_A_ATTR, /* val, attr */
168 TK_A_RUN, /* val, bool */
169 TK_A_GOTO, /* size_t */
170
171 TK_END,
172 };
173
174 /* we try to pack stuff in a way that we take only 12 bytes per token */
175 struct token {
176 union {
177 unsigned char type; /* same in rule and key */
178 struct {
179 enum token_type type:8;
180 bool can_set_name:1;
181 bool has_static_node:1;
182 unsigned int unused:6;
183 unsigned short token_count;
184 unsigned int label_off;
185 unsigned short filename_off;
186 unsigned short filename_line;
187 } rule;
188 struct {
189 enum token_type type:8;
190 enum operation_type op:8;
191 enum string_glob_type glob:8;
192 enum string_subst_type subst:4;
193 enum string_subst_type attrsubst:4;
194 unsigned int value_off;
195 union {
196 unsigned int attr_off;
197 int devlink_unique;
198 int fail_on_error;
199 unsigned int rule_goto;
200 mode_t mode;
201 uid_t uid;
202 gid_t gid;
203 int devlink_prio;
204 int event_timeout;
205 int watch;
206 };
207 } key;
208 };
209 };
210
211 #define MAX_TK 64
212 struct rule_tmp {
213 struct udev_rules *rules;
214 struct token rule;
215 struct token token[MAX_TK];
216 unsigned int token_cur;
217 };
218
219 #ifdef ENABLE_DEBUG
220 static const char *operation_str(enum operation_type type)
221 {
222 static const char *operation_strs[] = {
223 [OP_UNSET] = "UNSET",
224 [OP_MATCH] = "match",
225 [OP_NOMATCH] = "nomatch",
226 [OP_MATCH_MAX] = "MATCH_MAX",
227
228 [OP_ADD] = "add",
229 [OP_ASSIGN] = "assign",
230 [OP_ASSIGN_FINAL] = "assign-final",
231 } ;
232
233 return operation_strs[type];
234 }
235
236 static const char *string_glob_str(enum string_glob_type type)
237 {
238 static const char *string_glob_strs[] = {
239 [GL_UNSET] = "UNSET",
240 [GL_PLAIN] = "plain",
241 [GL_GLOB] = "glob",
242 [GL_SPLIT] = "split",
243 [GL_SPLIT_GLOB] = "split-glob",
244 [GL_SOMETHING] = "split-glob",
245 };
246
247 return string_glob_strs[type];
248 }
249
250 static const char *token_str(enum token_type type)
251 {
252 static const char *token_strs[] = {
253 [TK_UNSET] = "UNSET",
254 [TK_RULE] = "RULE",
255
256 [TK_M_ACTION] = "M ACTION",
257 [TK_M_DEVPATH] = "M DEVPATH",
258 [TK_M_KERNEL] = "M KERNEL",
259 [TK_M_DEVLINK] = "M DEVLINK",
260 [TK_M_NAME] = "M NAME",
261 [TK_M_ENV] = "M ENV",
262 [TK_M_TAG] = "M TAG",
263 [TK_M_SUBSYSTEM] = "M SUBSYSTEM",
264 [TK_M_DRIVER] = "M DRIVER",
265 [TK_M_WAITFOR] = "M WAITFOR",
266 [TK_M_ATTR] = "M ATTR",
267
268 [TK_M_PARENTS_MIN] = "M PARENTS_MIN",
269 [TK_M_KERNELS] = "M KERNELS",
270 [TK_M_SUBSYSTEMS] = "M SUBSYSTEMS",
271 [TK_M_DRIVERS] = "M DRIVERS",
272 [TK_M_ATTRS] = "M ATTRS",
273 [TK_M_PARENTS_MAX] = "M PARENTS_MAX",
274
275 [TK_M_TEST] = "M TEST",
276 [TK_M_PROGRAM] = "M PROGRAM",
277 [TK_M_IMPORT_FILE] = "M IMPORT_FILE",
278 [TK_M_IMPORT_PROG] = "M IMPORT_PROG",
279 [TK_M_IMPORT_DB] = "M IMPORT_DB",
280 [TK_M_IMPORT_CMDLINE] = "M IMPORT_CMDLINE",
281 [TK_M_IMPORT_PARENT] = "M IMPORT_PARENT",
282 [TK_M_RESULT] = "M RESULT",
283 [TK_M_MAX] = "M MAX",
284
285 [TK_A_STRING_ESCAPE_NONE] = "A STRING_ESCAPE_NONE",
286 [TK_A_STRING_ESCAPE_REPLACE] = "A STRING_ESCAPE_REPLACE",
287 [TK_A_INOTIFY_WATCH] = "A INOTIFY_WATCH",
288 [TK_A_DEVLINK_PRIO] = "A DEVLINK_PRIO",
289 [TK_A_OWNER] = "A OWNER",
290 [TK_A_GROUP] = "A GROUP",
291 [TK_A_MODE] = "A MODE",
292 [TK_A_OWNER_ID] = "A OWNER_ID",
293 [TK_A_GROUP_ID] = "A GROUP_ID",
294 [TK_A_STATIC_NODE] = "A STATIC_NODE",
295 [TK_A_MODE_ID] = "A MODE_ID",
296 [TK_A_ENV] = "A ENV",
297 [TK_A_TAG] = "A ENV",
298 [TK_A_NAME] = "A NAME",
299 [TK_A_DEVLINK] = "A DEVLINK",
300 [TK_A_EVENT_TIMEOUT] = "A EVENT_TIMEOUT",
301 [TK_A_ATTR] = "A ATTR",
302 [TK_A_RUN] = "A RUN",
303 [TK_A_GOTO] = "A GOTO",
304
305 [TK_END] = "END",
306 };
307
308 return token_strs[type];
309 }
310
311 static void dump_token(struct udev_rules *rules, struct token *token)
312 {
313 enum token_type type = token->type;
314 enum operation_type op = token->key.op;
315 enum string_glob_type glob = token->key.glob;
316 const char *value = &rules->buf[token->key.value_off];
317 const char *attr = &rules->buf[token->key.attr_off];
318
319 switch (type) {
320 case TK_RULE:
321 {
322 const char *tks_ptr = (char *)rules->tokens;
323 const char *tk_ptr = (char *)token;
324 unsigned int idx = (tk_ptr - tks_ptr) / sizeof(struct token);
325
326 dbg(rules->udev, "* RULE %s:%u, token: %u, count: %u, label: '%s'\n",
327 &rules->buf[token->rule.filename_off], token->rule.filename_line,
328 idx, token->rule.token_count,
329 &rules->buf[token->rule.label_off]);
330 break;
331 }
332 case TK_M_ACTION:
333 case TK_M_DEVPATH:
334 case TK_M_KERNEL:
335 case TK_M_SUBSYSTEM:
336 case TK_M_DRIVER:
337 case TK_M_WAITFOR:
338 case TK_M_DEVLINK:
339 case TK_M_NAME:
340 case TK_M_KERNELS:
341 case TK_M_SUBSYSTEMS:
342 case TK_M_DRIVERS:
343 case TK_M_PROGRAM:
344 case TK_M_IMPORT_FILE:
345 case TK_M_IMPORT_PROG:
346 case TK_M_IMPORT_DB:
347 case TK_M_IMPORT_CMDLINE:
348 case TK_M_IMPORT_PARENT:
349 case TK_M_RESULT:
350 case TK_A_NAME:
351 case TK_A_DEVLINK:
352 case TK_A_OWNER:
353 case TK_A_GROUP:
354 case TK_A_MODE:
355 case TK_A_RUN:
356 dbg(rules->udev, "%s %s '%s'(%s)\n",
357 token_str(type), operation_str(op), value, string_glob_str(glob));
358 break;
359 case TK_M_ATTR:
360 case TK_M_ATTRS:
361 case TK_M_ENV:
362 case TK_A_ATTR:
363 case TK_A_ENV:
364 dbg(rules->udev, "%s %s '%s' '%s'(%s)\n",
365 token_str(type), operation_str(op), attr, value, string_glob_str(glob));
366 break;
367 case TK_M_TAG:
368 case TK_A_TAG:
369 dbg(rules->udev, "%s %s '%s'\n", token_str(type), operation_str(op), value);
370 break;
371 case TK_A_STRING_ESCAPE_NONE:
372 case TK_A_STRING_ESCAPE_REPLACE:
373 dbg(rules->udev, "%s\n", token_str(type));
374 break;
375 case TK_M_TEST:
376 dbg(rules->udev, "%s %s '%s'(%s) %#o\n",
377 token_str(type), operation_str(op), value, string_glob_str(glob), token->key.mode);
378 break;
379 case TK_A_INOTIFY_WATCH:
380 dbg(rules->udev, "%s %u\n", token_str(type), token->key.watch);
381 break;
382 case TK_A_DEVLINK_PRIO:
383 dbg(rules->udev, "%s %u\n", token_str(type), token->key.devlink_prio);
384 break;
385 case TK_A_OWNER_ID:
386 dbg(rules->udev, "%s %s %u\n", token_str(type), operation_str(op), token->key.uid);
387 break;
388 case TK_A_GROUP_ID:
389 dbg(rules->udev, "%s %s %u\n", token_str(type), operation_str(op), token->key.gid);
390 break;
391 case TK_A_MODE_ID:
392 dbg(rules->udev, "%s %s %#o\n", token_str(type), operation_str(op), token->key.mode);
393 break;
394 case TK_A_STATIC_NODE:
395 dbg(rules->udev, "%s '%s'\n", token_str(type), value);
396 break;
397 case TK_A_EVENT_TIMEOUT:
398 dbg(rules->udev, "%s %u\n", token_str(type), token->key.event_timeout);
399 break;
400 case TK_A_GOTO:
401 dbg(rules->udev, "%s '%s' %u\n", token_str(type), value, token->key.rule_goto);
402 break;
403 case TK_END:
404 dbg(rules->udev, "* %s\n", token_str(type));
405 break;
406 case TK_M_PARENTS_MIN:
407 case TK_M_PARENTS_MAX:
408 case TK_M_MAX:
409 case TK_UNSET:
410 dbg(rules->udev, "unknown type %u\n", type);
411 break;
412 }
413 }
414
415 static void dump_rules(struct udev_rules *rules)
416 {
417 unsigned int i;
418
419 dbg(rules->udev, "dumping %u (%zu bytes) tokens, %u (%zu bytes) strings\n",
420 rules->token_cur,
421 rules->token_cur * sizeof(struct token),
422 rules->buf_count,
423 rules->buf_cur);
424 for(i = 0; i < rules->token_cur; i++)
425 dump_token(rules, &rules->tokens[i]);
426 }
427 #else
428 static inline const char *operation_str(enum operation_type type) { return NULL; }
429 static inline const char *token_str(enum token_type type) { return NULL; }
430 static inline void dump_token(struct udev_rules *rules, struct token *token) {}
431 static inline void dump_rules(struct udev_rules *rules) {}
432 #endif /* ENABLE_DEBUG */
433
434 static int add_new_string(struct udev_rules *rules, const char *str, size_t bytes)
435 {
436 int off;
437
438 /* grow buffer if needed */
439 if (rules->buf_cur + bytes+1 >= rules->buf_max) {
440 char *buf;
441 unsigned int add;
442
443 /* double the buffer size */
444 add = rules->buf_max;
445 if (add < bytes * 8)
446 add = bytes * 8;
447
448 buf = realloc(rules->buf, rules->buf_max + add);
449 if (buf == NULL)
450 return -1;
451 dbg(rules->udev, "extend buffer from %zu to %zu\n", rules->buf_max, rules->buf_max + add);
452 rules->buf = buf;
453 rules->buf_max += add;
454 }
455 off = rules->buf_cur;
456 memcpy(&rules->buf[rules->buf_cur], str, bytes);
457 rules->buf_cur += bytes;
458 rules->buf_count++;
459 return off;
460 }
461
462 static int add_string(struct udev_rules *rules, const char *str)
463 {
464 unsigned int node_idx;
465 struct trie_node *new_node;
466 unsigned int new_node_idx;
467 unsigned char key;
468 unsigned short len;
469 unsigned int depth;
470 unsigned int off;
471 struct trie_node *parent;
472
473 /* walk trie, start from last character of str to find matching tails */
474 len = strlen(str);
475 key = str[len-1];
476 node_idx = 0;
477 for (depth = 0; depth <= len; depth++) {
478 struct trie_node *node;
479 unsigned int child_idx;
480
481 node = &rules->trie_nodes[node_idx];
482 off = node->value_off + node->value_len - len;
483
484 /* match against current node */
485 if (depth == len || (node->value_len >= len && memcmp(&rules->buf[off], str, len) == 0))
486 return off;
487
488 /* lookup child node */
489 key = str[len - 1 - depth];
490 child_idx = node->child_idx;
491 while (child_idx > 0) {
492 struct trie_node *child;
493
494 child = &rules->trie_nodes[child_idx];
495 if (child->key == key)
496 break;
497 child_idx = child->next_child_idx;
498 }
499 if (child_idx == 0)
500 break;
501 node_idx = child_idx;
502 }
503
504 /* string not found, add it */
505 off = add_new_string(rules, str, len + 1);
506
507 /* grow trie nodes if needed */
508 if (rules->trie_nodes_cur >= rules->trie_nodes_max) {
509 struct trie_node *nodes;
510 unsigned int add;
511
512 /* double the buffer size */
513 add = rules->trie_nodes_max;
514 if (add < 8)
515 add = 8;
516
517 nodes = realloc(rules->trie_nodes, (rules->trie_nodes_max + add) * sizeof(struct trie_node));
518 if (nodes == NULL)
519 return -1;
520 dbg(rules->udev, "extend trie nodes from %u to %u\n",
521 rules->trie_nodes_max, rules->trie_nodes_max + add);
522 rules->trie_nodes = nodes;
523 rules->trie_nodes_max += add;
524 }
525
526 /* get a new node */
527 new_node_idx = rules->trie_nodes_cur;
528 rules->trie_nodes_cur++;
529 new_node = &rules->trie_nodes[new_node_idx];
530 memset(new_node, 0x00, sizeof(struct trie_node));
531 new_node->value_off = off;
532 new_node->value_len = len;
533 new_node->key = key;
534
535 /* join the parent's child list */
536 parent = &rules->trie_nodes[node_idx];
537 if (parent->child_idx == 0) {
538 parent->child_idx = new_node_idx;
539 } else {
540 struct trie_node *last_child;
541
542 last_child = &rules->trie_nodes[parent->last_child_idx];
543 last_child->next_child_idx = new_node_idx;
544 }
545 parent->last_child_idx = new_node_idx;
546 return off;
547 }
548
549 static int add_token(struct udev_rules *rules, struct token *token)
550 {
551 /* grow buffer if needed */
552 if (rules->token_cur+1 >= rules->token_max) {
553 struct token *tokens;
554 unsigned int add;
555
556 /* double the buffer size */
557 add = rules->token_max;
558 if (add < 8)
559 add = 8;
560
561 tokens = realloc(rules->tokens, (rules->token_max + add ) * sizeof(struct token));
562 if (tokens == NULL)
563 return -1;
564 dbg(rules->udev, "extend tokens from %u to %u\n", rules->token_max, rules->token_max + add);
565 rules->tokens = tokens;
566 rules->token_max += add;
567 }
568 memcpy(&rules->tokens[rules->token_cur], token, sizeof(struct token));
569 rules->token_cur++;
570 return 0;
571 }
572
573 static uid_t add_uid(struct udev_rules *rules, const char *owner)
574 {
575 unsigned int i;
576 uid_t uid;
577 unsigned int off;
578
579 /* lookup, if we know it already */
580 for (i = 0; i < rules->uids_cur; i++) {
581 off = rules->uids[i].name_off;
582 if (strcmp(&rules->buf[off], owner) == 0) {
583 uid = rules->uids[i].uid;
584 dbg(rules->udev, "return existing %u for '%s'\n", uid, owner);
585 return uid;
586 }
587 }
588 uid = util_lookup_user(rules->udev, owner);
589
590 /* grow buffer if needed */
591 if (rules->uids_cur+1 >= rules->uids_max) {
592 struct uid_gid *uids;
593 unsigned int add;
594
595 /* double the buffer size */
596 add = rules->uids_max;
597 if (add < 1)
598 add = 8;
599
600 uids = realloc(rules->uids, (rules->uids_max + add ) * sizeof(struct uid_gid));
601 if (uids == NULL)
602 return uid;
603 dbg(rules->udev, "extend uids from %u to %u\n", rules->uids_max, rules->uids_max + add);
604 rules->uids = uids;
605 rules->uids_max += add;
606 }
607 rules->uids[rules->uids_cur].uid = uid;
608 off = add_string(rules, owner);
609 if (off <= 0)
610 return uid;
611 rules->uids[rules->uids_cur].name_off = off;
612 rules->uids_cur++;
613 return uid;
614 }
615
616 static gid_t add_gid(struct udev_rules *rules, const char *group)
617 {
618 unsigned int i;
619 gid_t gid;
620 unsigned int off;
621
622 /* lookup, if we know it already */
623 for (i = 0; i < rules->gids_cur; i++) {
624 off = rules->gids[i].name_off;
625 if (strcmp(&rules->buf[off], group) == 0) {
626 gid = rules->gids[i].gid;
627 dbg(rules->udev, "return existing %u for '%s'\n", gid, group);
628 return gid;
629 }
630 }
631 gid = util_lookup_group(rules->udev, group);
632
633 /* grow buffer if needed */
634 if (rules->gids_cur+1 >= rules->gids_max) {
635 struct uid_gid *gids;
636 unsigned int add;
637
638 /* double the buffer size */
639 add = rules->gids_max;
640 if (add < 1)
641 add = 8;
642
643 gids = realloc(rules->gids, (rules->gids_max + add ) * sizeof(struct uid_gid));
644 if (gids == NULL)
645 return gid;
646 dbg(rules->udev, "extend gids from %u to %u\n", rules->gids_max, rules->gids_max + add);
647 rules->gids = gids;
648 rules->gids_max += add;
649 }
650 rules->gids[rules->gids_cur].gid = gid;
651 off = add_string(rules, group);
652 if (off <= 0)
653 return gid;
654 rules->gids[rules->gids_cur].name_off = off;
655 rules->gids_cur++;
656 return gid;
657 }
658
659 static int import_property_from_string(struct udev_device *dev, char *line)
660 {
661 struct udev *udev = udev_device_get_udev(dev);
662 char *key;
663 char *val;
664 size_t len;
665
666 /* find key */
667 key = line;
668 while (isspace(key[0]))
669 key++;
670
671 /* comment or empty line */
672 if (key[0] == '#' || key[0] == '\0')
673 return -1;
674
675 /* split key/value */
676 val = strchr(key, '=');
677 if (val == NULL)
678 return -1;
679 val[0] = '\0';
680 val++;
681
682 /* find value */
683 while (isspace(val[0]))
684 val++;
685
686 /* terminate key */
687 len = strlen(key);
688 if (len == 0)
689 return -1;
690 while (isspace(key[len-1]))
691 len--;
692 key[len] = '\0';
693
694 /* terminate value */
695 len = strlen(val);
696 if (len == 0)
697 return -1;
698 while (isspace(val[len-1]))
699 len--;
700 val[len] = '\0';
701
702 if (len == 0)
703 return -1;
704
705 /* unquote */
706 if (val[0] == '"' || val[0] == '\'') {
707 if (val[len-1] != val[0]) {
708 info(udev, "inconsistent quoting: '%s', skip\n", line);
709 return -1;
710 }
711 val[len-1] = '\0';
712 val++;
713 }
714
715 dbg(udev, "adding '%s'='%s'\n", key, val);
716
717 /* handle device, renamed by external tool, returning new path */
718 if (strcmp(key, "DEVPATH") == 0) {
719 char syspath[UTIL_PATH_SIZE];
720
721 info(udev, "updating devpath from '%s' to '%s'\n",
722 udev_device_get_devpath(dev), val);
723 util_strscpyl(syspath, sizeof(syspath), udev_get_sys_path(udev), val, NULL);
724 udev_device_set_syspath(dev, syspath);
725 } else {
726 struct udev_list_entry *entry;
727
728 entry = udev_device_add_property(dev, key, val);
729 /* store in db, skip private keys */
730 if (key[0] != '.')
731 udev_list_entry_set_flags(entry, 1);
732 }
733 return 0;
734 }
735
736 static int import_file_into_properties(struct udev_device *dev, const char *filename)
737 {
738 FILE *f;
739 char line[UTIL_LINE_SIZE];
740
741 f = fopen(filename, "r");
742 if (f == NULL)
743 return -1;
744 while (fgets(line, sizeof(line), f) != NULL)
745 import_property_from_string(dev, line);
746 fclose(f);
747 return 0;
748 }
749
750 static int import_program_into_properties(struct udev_device *dev, const char *program)
751 {
752 struct udev *udev = udev_device_get_udev(dev);
753 char **envp;
754 char result[UTIL_LINE_SIZE];
755 size_t reslen;
756 char *line;
757
758 envp = udev_device_get_properties_envp(dev);
759 if (util_run_program(udev, program, envp, result, sizeof(result), &reslen, NULL, false) != 0)
760 return -1;
761
762 line = result;
763 while (line != NULL) {
764 char *pos;
765
766 pos = strchr(line, '\n');
767 if (pos != NULL) {
768 pos[0] = '\0';
769 pos = &pos[1];
770 }
771 import_property_from_string(dev, line);
772 line = pos;
773 }
774 return 0;
775 }
776
777 static int import_parent_into_properties(struct udev_device *dev, const char *filter)
778 {
779 struct udev *udev = udev_device_get_udev(dev);
780 struct udev_device *dev_parent;
781 struct udev_list_entry *list_entry;
782
783 dev_parent = udev_device_get_parent(dev);
784 if (dev_parent == NULL)
785 return -1;
786
787 dbg(udev, "found parent '%s', get the node name\n", udev_device_get_syspath(dev_parent));
788 udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(dev_parent)) {
789 const char *key = udev_list_entry_get_name(list_entry);
790 const char *val = udev_list_entry_get_value(list_entry);
791
792 if (fnmatch(filter, key, 0) == 0) {
793 struct udev_list_entry *entry;
794
795 dbg(udev, "import key '%s=%s'\n", key, val);
796 entry = udev_device_add_property(dev, key, val);
797 /* store in db, skip private keys */
798 if (key[0] != '.')
799 udev_list_entry_set_flags(entry, 1);
800 }
801 }
802 return 0;
803 }
804
805 #define WAIT_LOOP_PER_SECOND 50
806 static int wait_for_file(struct udev_device *dev, const char *file, int timeout)
807 {
808 struct udev *udev = udev_device_get_udev(dev);
809 char filepath[UTIL_PATH_SIZE];
810 char devicepath[UTIL_PATH_SIZE];
811 struct stat stats;
812 int loop = timeout * WAIT_LOOP_PER_SECOND;
813
814 /* a relative path is a device attribute */
815 devicepath[0] = '\0';
816 if (file[0] != '/') {
817 util_strscpyl(devicepath, sizeof(devicepath),
818 udev_get_sys_path(udev), udev_device_get_devpath(dev), NULL);
819 util_strscpyl(filepath, sizeof(filepath), devicepath, "/", file, NULL);
820 file = filepath;
821 }
822
823 dbg(udev, "will wait %i sec for '%s'\n", timeout, file);
824 while (--loop) {
825 const struct timespec duration = { 0, 1000 * 1000 * 1000 / WAIT_LOOP_PER_SECOND };
826
827 /* lookup file */
828 if (stat(file, &stats) == 0) {
829 info(udev, "file '%s' appeared after %i loops\n", file, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
830 return 0;
831 }
832 /* make sure, the device did not disappear in the meantime */
833 if (devicepath[0] != '\0' && stat(devicepath, &stats) != 0) {
834 info(udev, "device disappeared while waiting for '%s'\n", file);
835 return -2;
836 }
837 info(udev, "wait for '%s' for %i mseconds\n", file, 1000 / WAIT_LOOP_PER_SECOND);
838 nanosleep(&duration, NULL);
839 }
840 info(udev, "waiting for '%s' failed\n", file);
841 return -1;
842 }
843
844 static int attr_subst_subdir(char *attr, size_t len)
845 {
846 bool found = false;
847
848 if (strstr(attr, "/*/")) {
849 char *pos;
850 char dirname[UTIL_PATH_SIZE];
851 const char *tail;
852 DIR *dir;
853
854 util_strscpy(dirname, sizeof(dirname), attr);
855 pos = strstr(dirname, "/*/");
856 if (pos == NULL)
857 return -1;
858 pos[0] = '\0';
859 tail = &pos[2];
860 dir = opendir(dirname);
861 if (dir != NULL) {
862 struct dirent *dent;
863
864 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
865 struct stat stats;
866
867 if (dent->d_name[0] == '.')
868 continue;
869 util_strscpyl(attr, len, dirname, "/", dent->d_name, tail, NULL);
870 if (stat(attr, &stats) == 0) {
871 found = true;
872 break;
873 }
874 }
875 closedir(dir);
876 }
877 }
878
879 return found;
880 }
881
882 static int get_key(struct udev *udev, char **line, char **key, enum operation_type *op, char **value)
883 {
884 char *linepos;
885 char *temp;
886
887 linepos = *line;
888 if (linepos == NULL || linepos[0] == '\0')
889 return -1;
890
891 /* skip whitespace */
892 while (isspace(linepos[0]) || linepos[0] == ',')
893 linepos++;
894
895 /* get the key */
896 if (linepos[0] == '\0')
897 return -1;
898 *key = linepos;
899
900 for (;;) {
901 linepos++;
902 if (linepos[0] == '\0')
903 return -1;
904 if (isspace(linepos[0]))
905 break;
906 if (linepos[0] == '=')
907 break;
908 if ((linepos[0] == '+') || (linepos[0] == '!') || (linepos[0] == ':'))
909 if (linepos[1] == '=')
910 break;
911 }
912
913 /* remember end of key */
914 temp = linepos;
915
916 /* skip whitespace after key */
917 while (isspace(linepos[0]))
918 linepos++;
919 if (linepos[0] == '\0')
920 return -1;
921
922 /* get operation type */
923 if (linepos[0] == '=' && linepos[1] == '=') {
924 *op = OP_MATCH;
925 linepos += 2;
926 } else if (linepos[0] == '!' && linepos[1] == '=') {
927 *op = OP_NOMATCH;
928 linepos += 2;
929 } else if (linepos[0] == '+' && linepos[1] == '=') {
930 *op = OP_ADD;
931 linepos += 2;
932 } else if (linepos[0] == '=') {
933 *op = OP_ASSIGN;
934 linepos++;
935 } else if (linepos[0] == ':' && linepos[1] == '=') {
936 *op = OP_ASSIGN_FINAL;
937 linepos += 2;
938 } else
939 return -1;
940
941 /* terminate key */
942 temp[0] = '\0';
943
944 /* skip whitespace after operator */
945 while (isspace(linepos[0]))
946 linepos++;
947 if (linepos[0] == '\0')
948 return -1;
949
950 /* get the value */
951 if (linepos[0] == '"')
952 linepos++;
953 else
954 return -1;
955 *value = linepos;
956
957 /* terminate */
958 temp = strchr(linepos, '"');
959 if (!temp)
960 return -1;
961 temp[0] = '\0';
962 temp++;
963 dbg(udev, "%s '%s'-'%s'\n", operation_str(*op), *key, *value);
964
965 /* move line to next key */
966 *line = temp;
967 return 0;
968 }
969
970 /* extract possible KEY{attr} */
971 static char *get_key_attribute(struct udev *udev, char *str)
972 {
973 char *pos;
974 char *attr;
975
976 attr = strchr(str, '{');
977 if (attr != NULL) {
978 attr++;
979 pos = strchr(attr, '}');
980 if (pos == NULL) {
981 err(udev, "missing closing brace for format\n");
982 return NULL;
983 }
984 pos[0] = '\0';
985 dbg(udev, "attribute='%s'\n", attr);
986 return attr;
987 }
988 return NULL;
989 }
990
991 static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
992 enum operation_type op,
993 const char *value, const void *data)
994 {
995 struct token *token = &rule_tmp->token[rule_tmp->token_cur];
996 const char *attr = NULL;
997
998 memset(token, 0x00, sizeof(struct token));
999
1000 switch (type) {
1001 case TK_M_ACTION:
1002 case TK_M_DEVPATH:
1003 case TK_M_KERNEL:
1004 case TK_M_SUBSYSTEM:
1005 case TK_M_DRIVER:
1006 case TK_M_WAITFOR:
1007 case TK_M_DEVLINK:
1008 case TK_M_NAME:
1009 case TK_M_KERNELS:
1010 case TK_M_SUBSYSTEMS:
1011 case TK_M_DRIVERS:
1012 case TK_M_PROGRAM:
1013 case TK_M_IMPORT_FILE:
1014 case TK_M_IMPORT_PROG:
1015 case TK_M_IMPORT_DB:
1016 case TK_M_IMPORT_CMDLINE:
1017 case TK_M_IMPORT_PARENT:
1018 case TK_M_RESULT:
1019 case TK_A_OWNER:
1020 case TK_A_GROUP:
1021 case TK_A_MODE:
1022 case TK_A_NAME:
1023 case TK_A_GOTO:
1024 case TK_M_TAG:
1025 case TK_A_TAG:
1026 token->key.value_off = add_string(rule_tmp->rules, value);
1027 break;
1028 case TK_M_ENV:
1029 case TK_M_ATTR:
1030 case TK_M_ATTRS:
1031 case TK_A_ATTR:
1032 case TK_A_ENV:
1033 attr = data;
1034 token->key.value_off = add_string(rule_tmp->rules, value);
1035 token->key.attr_off = add_string(rule_tmp->rules, attr);
1036 break;
1037 case TK_A_DEVLINK:
1038 token->key.value_off = add_string(rule_tmp->rules, value);
1039 token->key.devlink_unique = *(int *)data;
1040 break;
1041 case TK_M_TEST:
1042 token->key.value_off = add_string(rule_tmp->rules, value);
1043 if (data != NULL)
1044 token->key.mode = *(mode_t *)data;
1045 break;
1046 case TK_A_STRING_ESCAPE_NONE:
1047 case TK_A_STRING_ESCAPE_REPLACE:
1048 break;
1049 case TK_A_RUN:
1050 token->key.value_off = add_string(rule_tmp->rules, value);
1051 token->key.fail_on_error = *(int *)data;
1052 break;
1053 case TK_A_INOTIFY_WATCH:
1054 case TK_A_DEVLINK_PRIO:
1055 token->key.devlink_prio = *(int *)data;
1056 break;
1057 case TK_A_OWNER_ID:
1058 token->key.uid = *(uid_t *)data;
1059 break;
1060 case TK_A_GROUP_ID:
1061 token->key.gid = *(gid_t *)data;
1062 break;
1063 case TK_A_MODE_ID:
1064 token->key.mode = *(mode_t *)data;
1065 break;
1066 case TK_A_STATIC_NODE:
1067 token->key.value_off = add_string(rule_tmp->rules, value);
1068 break;
1069 case TK_A_EVENT_TIMEOUT:
1070 token->key.event_timeout = *(int *)data;
1071 break;
1072 case TK_RULE:
1073 case TK_M_PARENTS_MIN:
1074 case TK_M_PARENTS_MAX:
1075 case TK_M_MAX:
1076 case TK_END:
1077 case TK_UNSET:
1078 err(rule_tmp->rules->udev, "wrong type %u\n", type);
1079 return -1;
1080 }
1081
1082 if (value != NULL && type < TK_M_MAX) {
1083 /* check if we need to split or call fnmatch() while matching rules */
1084 enum string_glob_type glob;
1085 int has_split;
1086 int has_glob;
1087
1088 has_split = (strchr(value, '|') != NULL);
1089 has_glob = (strchr(value, '*') != NULL || strchr(value, '?') != NULL || strchr(value, '[') != NULL);
1090 if (has_split && has_glob) {
1091 glob = GL_SPLIT_GLOB;
1092 } else if (has_split) {
1093 glob = GL_SPLIT;
1094 } else if (has_glob) {
1095 if (strcmp(value, "?*") == 0)
1096 glob = GL_SOMETHING;
1097 else
1098 glob = GL_GLOB;
1099 } else {
1100 glob = GL_PLAIN;
1101 }
1102 token->key.glob = glob;
1103 }
1104
1105 if (value != NULL && type > TK_M_MAX) {
1106 /* check if assigned value has substitution chars */
1107 if (value[0] == '[')
1108 token->key.subst = SB_SUBSYS;
1109 else if (strchr(value, '%') != NULL || strchr(value, '$') != NULL)
1110 token->key.subst = SB_FORMAT;
1111 else
1112 token->key.subst = SB_NONE;
1113 }
1114
1115 if (attr != NULL) {
1116 /* check if property/attribut name has substitution chars */
1117 if (attr[0] == '[')
1118 token->key.attrsubst = SB_SUBSYS;
1119 else if (strchr(attr, '%') != NULL || strchr(attr, '$') != NULL)
1120 token->key.attrsubst = SB_FORMAT;
1121 else
1122 token->key.attrsubst = SB_NONE;
1123 }
1124
1125 token->key.type = type;
1126 token->key.op = op;
1127 rule_tmp->token_cur++;
1128 if (rule_tmp->token_cur >= ARRAY_SIZE(rule_tmp->token)) {
1129 err(rule_tmp->rules->udev, "temporary rule array too small\n");
1130 return -1;
1131 }
1132 return 0;
1133 }
1134
1135 static int sort_token(struct udev_rules *rules, struct rule_tmp *rule_tmp)
1136 {
1137 unsigned int i;
1138 unsigned int start = 0;
1139 unsigned int end = rule_tmp->token_cur;
1140
1141 for (i = 0; i < rule_tmp->token_cur; i++) {
1142 enum token_type next_val = TK_UNSET;
1143 unsigned int next_idx = 0;
1144 unsigned int j;
1145
1146 /* find smallest value */
1147 for (j = start; j < end; j++) {
1148 if (rule_tmp->token[j].type == TK_UNSET)
1149 continue;
1150 if (next_val == TK_UNSET || rule_tmp->token[j].type < next_val) {
1151 next_val = rule_tmp->token[j].type;
1152 next_idx = j;
1153 }
1154 }
1155
1156 /* add token and mark done */
1157 if (add_token(rules, &rule_tmp->token[next_idx]) != 0)
1158 return -1;
1159 rule_tmp->token[next_idx].type = TK_UNSET;
1160
1161 /* shrink range */
1162 if (next_idx == start)
1163 start++;
1164 if (next_idx+1 == end)
1165 end--;
1166 }
1167 return 0;
1168 }
1169
1170 static int add_rule(struct udev_rules *rules, char *line,
1171 const char *filename, unsigned int filename_off, unsigned int lineno)
1172 {
1173 char *linepos;
1174 char *attr;
1175 struct rule_tmp rule_tmp;
1176 bool bus_warn = false;
1177 bool sysfs_warn = false;
1178 bool id_warn = false;
1179
1180 memset(&rule_tmp, 0x00, sizeof(struct rule_tmp));
1181 rule_tmp.rules = rules;
1182 rule_tmp.rule.type = TK_RULE;
1183 rule_tmp.rule.rule.filename_off = filename_off;
1184 rule_tmp.rule.rule.filename_line = lineno;
1185
1186 linepos = line;
1187 for (;;) {
1188 char *key;
1189 char *value;
1190 enum operation_type op;
1191
1192 if (get_key(rules->udev, &linepos, &key, &op, &value) != 0)
1193 break;
1194
1195 if (strcmp(key, "ACTION") == 0) {
1196 if (op > OP_MATCH_MAX) {
1197 err(rules->udev, "invalid ACTION operation\n");
1198 goto invalid;
1199 }
1200 rule_add_key(&rule_tmp, TK_M_ACTION, op, value, NULL);
1201 continue;
1202 }
1203
1204 if (strcmp(key, "DEVPATH") == 0) {
1205 if (op > OP_MATCH_MAX) {
1206 err(rules->udev, "invalid DEVPATH operation\n");
1207 goto invalid;
1208 }
1209 rule_add_key(&rule_tmp, TK_M_DEVPATH, op, value, NULL);
1210 continue;
1211 }
1212
1213 if (strcmp(key, "KERNEL") == 0) {
1214 if (op > OP_MATCH_MAX) {
1215 err(rules->udev, "invalid KERNEL operation\n");
1216 goto invalid;
1217 }
1218 rule_add_key(&rule_tmp, TK_M_KERNEL, op, value, NULL);
1219 continue;
1220 }
1221
1222 if (strcmp(key, "SUBSYSTEM") == 0) {
1223 if (op > OP_MATCH_MAX) {
1224 err(rules->udev, "invalid SUBSYSTEM operation\n");
1225 goto invalid;
1226 }
1227 /* bus, class, subsystem events should all be the same */
1228 if (strcmp(value, "subsystem") == 0 ||
1229 strcmp(value, "bus") == 0 ||
1230 strcmp(value, "class") == 0) {
1231 if (strcmp(value, "bus") == 0 || strcmp(value, "class") == 0)
1232 err(rules->udev, "'%s' must be specified as 'subsystem' \n"
1233 "please fix it in %s:%u", value, filename, lineno);
1234 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, "subsystem|class|bus", NULL);
1235 } else
1236 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, value, NULL);
1237 continue;
1238 }
1239
1240 if (strcmp(key, "DRIVER") == 0) {
1241 if (op > OP_MATCH_MAX) {
1242 err(rules->udev, "invalid DRIVER operation\n");
1243 goto invalid;
1244 }
1245 rule_add_key(&rule_tmp, TK_M_DRIVER, op, value, NULL);
1246 continue;
1247 }
1248
1249 if (strncmp(key, "ATTR{", sizeof("ATTR{")-1) == 0) {
1250 attr = get_key_attribute(rules->udev, key + sizeof("ATTR")-1);
1251 if (attr == NULL) {
1252 err(rules->udev, "error parsing ATTR attribute\n");
1253 goto invalid;
1254 }
1255 if (op < OP_MATCH_MAX) {
1256 rule_add_key(&rule_tmp, TK_M_ATTR, op, value, attr);
1257 } else {
1258 rule_add_key(&rule_tmp, TK_A_ATTR, op, value, attr);
1259 }
1260 continue;
1261 }
1262
1263 if (strcmp(key, "KERNELS") == 0) {
1264 if (op > OP_MATCH_MAX) {
1265 err(rules->udev, "invalid KERNELS operation\n");
1266 goto invalid;
1267 }
1268 rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1269 continue;
1270 }
1271
1272 if (strcmp(key, "ID") == 0) {
1273 if (!id_warn) {
1274 id_warn = true;
1275 err(rules->udev, "ID= will be removed in a future udev version, "
1276 "please use KERNEL= to match the event device, or KERNELS= "
1277 "to match a parent device, in %s:%u\n", filename, lineno);
1278 }
1279 if (op > OP_MATCH_MAX) {
1280 err(rules->udev, "invalid KERNELS operation\n");
1281 goto invalid;
1282 }
1283 rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1284 continue;
1285 }
1286
1287 if (strcmp(key, "SUBSYSTEMS") == 0) {
1288 if (op > OP_MATCH_MAX) {
1289 err(rules->udev, "invalid SUBSYSTEMS operation\n");
1290 goto invalid;
1291 }
1292 rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1293 continue;
1294 }
1295
1296 if (strcmp(key, "BUS") == 0) {
1297 if (!bus_warn) {
1298 bus_warn = true;
1299 err(rules->udev, "BUS= will be removed in a future udev version, "
1300 "please use SUBSYSTEM= to match the event device, or SUBSYSTEMS= "
1301 "to match a parent device, in %s:%u\n", filename, lineno);
1302 }
1303 if (op > OP_MATCH_MAX) {
1304 err(rules->udev, "invalid SUBSYSTEMS operation\n");
1305 goto invalid;
1306 }
1307 rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1308 continue;
1309 }
1310
1311 if (strcmp(key, "DRIVERS") == 0) {
1312 if (op > OP_MATCH_MAX) {
1313 err(rules->udev, "invalid DRIVERS operation\n");
1314 goto invalid;
1315 }
1316 rule_add_key(&rule_tmp, TK_M_DRIVERS, op, value, NULL);
1317 continue;
1318 }
1319
1320 if (strncmp(key, "ATTRS{", sizeof("ATTRS{")-1) == 0) {
1321 if (op > OP_MATCH_MAX) {
1322 err(rules->udev, "invalid ATTRS operation\n");
1323 goto invalid;
1324 }
1325 attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);
1326 if (attr == NULL) {
1327 err(rules->udev, "error parsing ATTRS attribute\n");
1328 goto invalid;
1329 }
1330 if (strncmp(attr, "device/", 7) == 0)
1331 err(rules->udev, "the 'device' link may not be available in a future kernel, "
1332 "please fix it in %s:%u", filename, lineno);
1333 else if (strstr(attr, "../") != NULL)
1334 err(rules->udev, "do not reference parent sysfs directories directly, "
1335 "it may break with a future kernel, please fix it in %s:%u", filename, lineno);
1336 rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1337 continue;
1338 }
1339
1340 if (strncmp(key, "SYSFS{", sizeof("SYSFS{")-1) == 0) {
1341 if (!sysfs_warn) {
1342 sysfs_warn = true;
1343 err(rules->udev, "SYSFS{}= will be removed in a future udev version, "
1344 "please use ATTR{}= to match the event device, or ATTRS{}= "
1345 "to match a parent device, in %s:%u\n", filename, lineno);
1346 }
1347 if (op > OP_MATCH_MAX) {
1348 err(rules->udev, "invalid ATTRS operation\n");
1349 goto invalid;
1350 }
1351 attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);
1352 if (attr == NULL) {
1353 err(rules->udev, "error parsing ATTRS attribute\n");
1354 goto invalid;
1355 }
1356 rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1357 continue;
1358 }
1359
1360 if (strncmp(key, "ENV{", sizeof("ENV{")-1) == 0) {
1361 attr = get_key_attribute(rules->udev, key + sizeof("ENV")-1);
1362 if (attr == NULL) {
1363 err(rules->udev, "error parsing ENV attribute\n");
1364 goto invalid;
1365 }
1366 if (op < OP_MATCH_MAX) {
1367 if (rule_add_key(&rule_tmp, TK_M_ENV, op, value, attr) != 0)
1368 goto invalid;
1369 } else {
1370 if (rule_add_key(&rule_tmp, TK_A_ENV, op, value, attr) != 0)
1371 goto invalid;
1372 }
1373 continue;
1374 }
1375
1376 if (strcmp(key, "TAG") == 0) {
1377 if (op < OP_MATCH_MAX)
1378 rule_add_key(&rule_tmp, TK_M_TAG, op, value, NULL);
1379 else
1380 rule_add_key(&rule_tmp, TK_A_TAG, op, value, NULL);
1381 continue;
1382 }
1383
1384 if (strcmp(key, "PROGRAM") == 0) {
1385 rule_add_key(&rule_tmp, TK_M_PROGRAM, op, value, NULL);
1386 continue;
1387 }
1388
1389 if (strcmp(key, "RESULT") == 0) {
1390 if (op > OP_MATCH_MAX) {
1391 err(rules->udev, "invalid RESULT operation\n");
1392 goto invalid;
1393 }
1394 rule_add_key(&rule_tmp, TK_M_RESULT, op, value, NULL);
1395 continue;
1396 }
1397
1398 if (strncmp(key, "IMPORT", sizeof("IMPORT")-1) == 0) {
1399 attr = get_key_attribute(rules->udev, key + sizeof("IMPORT")-1);
1400 if (attr != NULL && strstr(attr, "program")) {
1401 dbg(rules->udev, "IMPORT will be executed\n");
1402 rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1403 } else if (attr != NULL && strstr(attr, "file")) {
1404 dbg(rules->udev, "IMPORT will be included as file\n");
1405 rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1406 } else if (attr != NULL && strstr(attr, "db")) {
1407 dbg(rules->udev, "IMPORT will include db values\n");
1408 rule_add_key(&rule_tmp, TK_M_IMPORT_DB, op, value, NULL);
1409 } else if (attr != NULL && strstr(attr, "cmdline")) {
1410 dbg(rules->udev, "IMPORT will include db values\n");
1411 rule_add_key(&rule_tmp, TK_M_IMPORT_CMDLINE, op, value, NULL);
1412 } else if (attr != NULL && strstr(attr, "parent")) {
1413 dbg(rules->udev, "IMPORT will include the parent values\n");
1414 rule_add_key(&rule_tmp, TK_M_IMPORT_PARENT, op, value, NULL);
1415 } else {
1416 /* figure it out if it is executable */
1417 char file[UTIL_PATH_SIZE];
1418 char *pos;
1419 struct stat statbuf;
1420
1421 /* allow programs in /lib/udev called without the path */
1422 if (value[0] != '/')
1423 util_strscpyl(file, sizeof(file), LIBEXECDIR "/", value, NULL);
1424 else
1425 util_strscpy(file, sizeof(file), value);
1426 pos = strchr(file, ' ');
1427 if (pos)
1428 pos[0] = '\0';
1429 dbg(rules->udev, "IMPORT auto mode for '%s'\n", file);
1430 if (stat(file, &statbuf) == 0 && (statbuf.st_mode & S_IXUSR)) {
1431 dbg(rules->udev, "IMPORT will be executed (autotype)\n");
1432 rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1433 } else {
1434 dbg(rules->udev, "IMPORT will be included as file (autotype)\n");
1435 rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1436 }
1437 }
1438 continue;
1439 }
1440
1441 if (strncmp(key, "TEST", sizeof("TEST")-1) == 0) {
1442 mode_t mode = 0;
1443
1444 if (op > OP_MATCH_MAX) {
1445 err(rules->udev, "invalid TEST operation\n");
1446 goto invalid;
1447 }
1448 attr = get_key_attribute(rules->udev, key + sizeof("TEST")-1);
1449 if (attr != NULL) {
1450 mode = strtol(attr, NULL, 8);
1451 rule_add_key(&rule_tmp, TK_M_TEST, op, value, &mode);
1452 } else {
1453 rule_add_key(&rule_tmp, TK_M_TEST, op, value, NULL);
1454 }
1455 continue;
1456 }
1457
1458 if (strncmp(key, "RUN", sizeof("RUN")-1) == 0) {
1459 int flag = 0;
1460
1461 attr = get_key_attribute(rules->udev, key + sizeof("RUN")-1);
1462 if (attr != NULL && strstr(attr, "fail_event_on_error"))
1463 flag = 1;
1464 rule_add_key(&rule_tmp, TK_A_RUN, op, value, &flag);
1465 continue;
1466 }
1467
1468 if (strcmp(key, "WAIT_FOR") == 0 || strcmp(key, "WAIT_FOR_SYSFS") == 0) {
1469 rule_add_key(&rule_tmp, TK_M_WAITFOR, 0, value, NULL);
1470 continue;
1471 }
1472
1473 if (strcmp(key, "LABEL") == 0) {
1474 rule_tmp.rule.rule.label_off = add_string(rules, value);
1475 continue;
1476 }
1477
1478 if (strcmp(key, "GOTO") == 0) {
1479 rule_add_key(&rule_tmp, TK_A_GOTO, 0, value, NULL);
1480 continue;
1481 }
1482
1483 if (strncmp(key, "NAME", sizeof("NAME")-1) == 0) {
1484 if (op < OP_MATCH_MAX) {
1485 rule_add_key(&rule_tmp, TK_M_NAME, op, value, NULL);
1486 } else {
1487 if (strcmp(value, "%k") == 0) {
1488 err(rules->udev, "NAME=\"%%k\" is ignored, because it breaks kernel supplied names, "
1489 "please remove it from %s:%u\n", filename, lineno);
1490 continue;
1491 }
1492 if (value[0] == '\0') {
1493 info(rules->udev, "NAME=\"\" is ignored, because udev will not delete any device nodes, "
1494 "please remove it from %s:%u\n", filename, lineno);
1495 continue;
1496 }
1497 rule_add_key(&rule_tmp, TK_A_NAME, op, value, NULL);
1498 }
1499 rule_tmp.rule.rule.can_set_name = true;
1500 continue;
1501 }
1502
1503 if (strncmp(key, "SYMLINK", sizeof("SYMLINK")-1) == 0) {
1504 if (op < OP_MATCH_MAX) {
1505 rule_add_key(&rule_tmp, TK_M_DEVLINK, op, value, NULL);
1506 } else {
1507 int flag = 0;
1508
1509 attr = get_key_attribute(rules->udev, key + sizeof("SYMLINK")-1);
1510 if (attr != NULL && strstr(attr, "unique") != NULL)
1511 flag = 1;
1512 rule_add_key(&rule_tmp, TK_A_DEVLINK, op, value, &flag);
1513 }
1514 rule_tmp.rule.rule.can_set_name = true;
1515 continue;
1516 }
1517
1518 if (strcmp(key, "OWNER") == 0) {
1519 uid_t uid;
1520 char *endptr;
1521
1522 uid = strtoul(value, &endptr, 10);
1523 if (endptr[0] == '\0') {
1524 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1525 } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1526 uid = add_uid(rules, value);
1527 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1528 } else if (rules->resolve_names >= 0) {
1529 rule_add_key(&rule_tmp, TK_A_OWNER, op, value, NULL);
1530 }
1531 rule_tmp.rule.rule.can_set_name = true;
1532 continue;
1533 }
1534
1535 if (strcmp(key, "GROUP") == 0) {
1536 gid_t gid;
1537 char *endptr;
1538
1539 gid = strtoul(value, &endptr, 10);
1540 if (endptr[0] == '\0') {
1541 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1542 } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1543 gid = add_gid(rules, value);
1544 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1545 } else if (rules->resolve_names >= 0) {
1546 rule_add_key(&rule_tmp, TK_A_GROUP, op, value, NULL);
1547 }
1548 rule_tmp.rule.rule.can_set_name = true;
1549 continue;
1550 }
1551
1552 if (strcmp(key, "MODE") == 0) {
1553 mode_t mode;
1554 char *endptr;
1555
1556 mode = strtol(value, &endptr, 8);
1557 if (endptr[0] == '\0')
1558 rule_add_key(&rule_tmp, TK_A_MODE_ID, op, NULL, &mode);
1559 else
1560 rule_add_key(&rule_tmp, TK_A_MODE, op, value, NULL);
1561 rule_tmp.rule.rule.can_set_name = true;
1562 continue;
1563 }
1564
1565 if (strcmp(key, "OPTIONS") == 0) {
1566 const char *pos;
1567
1568 pos = strstr(value, "link_priority=");
1569 if (pos != NULL) {
1570 int prio = atoi(&pos[strlen("link_priority=")]);
1571
1572 rule_add_key(&rule_tmp, TK_A_DEVLINK_PRIO, op, NULL, &prio);
1573 dbg(rules->udev, "link priority=%i\n", prio);
1574 }
1575 pos = strstr(value, "event_timeout=");
1576 if (pos != NULL) {
1577 int tout = atoi(&pos[strlen("event_timeout=")]);
1578
1579 rule_add_key(&rule_tmp, TK_A_EVENT_TIMEOUT, op, NULL, &tout);
1580 dbg(rules->udev, "event timeout=%i\n", tout);
1581 }
1582 pos = strstr(value, "string_escape=");
1583 if (pos != NULL) {
1584 pos = &pos[strlen("string_escape=")];
1585 if (strncmp(pos, "none", strlen("none")) == 0)
1586 rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_NONE, op, NULL, NULL);
1587 else if (strncmp(pos, "replace", strlen("replace")) == 0)
1588 rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_REPLACE, op, NULL, NULL);
1589 }
1590 pos = strstr(value, "nowatch");
1591 if (pos != NULL) {
1592 const int off = 0;
1593
1594 rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &off);
1595 dbg(rules->udev, "inotify watch of device disabled\n");
1596 } else {
1597 pos = strstr(value, "watch");
1598 if (pos != NULL) {
1599 const int on = 1;
1600
1601 rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &on);
1602 dbg(rules->udev, "inotify watch of device requested\n");
1603 }
1604 }
1605 pos = strstr(value, "static_node=");
1606 if (pos != NULL) {
1607 rule_add_key(&rule_tmp, TK_A_STATIC_NODE, op, &pos[strlen("static_node=")], NULL);
1608 rule_tmp.rule.rule.has_static_node = true;
1609 }
1610 continue;
1611 }
1612 err(rules->udev, "unknown key '%s' in %s:%u\n", key, filename, lineno);
1613 }
1614
1615 /* add rule token */
1616 rule_tmp.rule.rule.token_count = 1 + rule_tmp.token_cur;
1617 if (add_token(rules, &rule_tmp.rule) != 0)
1618 goto invalid;
1619
1620 /* add tokens to list, sorted by type */
1621 if (sort_token(rules, &rule_tmp) != 0)
1622 goto invalid;
1623
1624 return 0;
1625 invalid:
1626 err(rules->udev, "invalid rule '%s:%u'\n", filename, lineno);
1627 return -1;
1628 }
1629
1630 static int parse_file(struct udev_rules *rules, const char *filename, unsigned short filename_off)
1631 {
1632 FILE *f;
1633 unsigned int first_token;
1634 char line[UTIL_LINE_SIZE];
1635 int line_nr = 0;
1636 unsigned int i;
1637
1638 info(rules->udev, "reading '%s' as rules file\n", filename);
1639
1640 f = fopen(filename, "r");
1641 if (f == NULL)
1642 return -1;
1643
1644 first_token = rules->token_cur;
1645
1646 while (fgets(line, sizeof(line), f) != NULL) {
1647 char *key;
1648 size_t len;
1649
1650 /* skip whitespace */
1651 line_nr++;
1652 key = line;
1653 while (isspace(key[0]))
1654 key++;
1655
1656 /* comment */
1657 if (key[0] == '#')
1658 continue;
1659
1660 len = strlen(line);
1661 if (len < 3)
1662 continue;
1663
1664 /* continue reading if backslash+newline is found */
1665 while (line[len-2] == '\\') {
1666 if (fgets(&line[len-2], (sizeof(line)-len)+2, f) == NULL)
1667 break;
1668 if (strlen(&line[len-2]) < 2)
1669 break;
1670 line_nr++;
1671 len = strlen(line);
1672 }
1673
1674 if (len+1 >= sizeof(line)) {
1675 err(rules->udev, "line too long '%s':%u, ignored\n", filename, line_nr);
1676 continue;
1677 }
1678 add_rule(rules, key, filename, filename_off, line_nr);
1679 }
1680 fclose(f);
1681
1682 /* link GOTOs to LABEL rules in this file to be able to fast-forward */
1683 for (i = first_token+1; i < rules->token_cur; i++) {
1684 if (rules->tokens[i].type == TK_A_GOTO) {
1685 char *label = &rules->buf[rules->tokens[i].key.value_off];
1686 unsigned int j;
1687
1688 for (j = i+1; j < rules->token_cur; j++) {
1689 if (rules->tokens[j].type != TK_RULE)
1690 continue;
1691 if (rules->tokens[j].rule.label_off == 0)
1692 continue;
1693 if (strcmp(label, &rules->buf[rules->tokens[j].rule.label_off]) != 0)
1694 continue;
1695 rules->tokens[i].key.rule_goto = j;
1696 break;
1697 }
1698 if (rules->tokens[i].key.rule_goto == 0)
1699 err(rules->udev, "GOTO '%s' has no matching label in: '%s'\n", label, filename);
1700 }
1701 }
1702 return 0;
1703 }
1704
1705 static int add_matching_files(struct udev *udev, struct udev_list_node *file_list, const char *dirname, const char *suffix)
1706 {
1707 DIR *dir;
1708 char filename[UTIL_PATH_SIZE];
1709
1710 dbg(udev, "open directory '%s'\n", dirname);
1711 dir = opendir(dirname);
1712 if (dir == NULL) {
1713 info(udev, "unable to open '%s': %m\n", dirname);
1714 return -1;
1715 }
1716
1717 for (;;) {
1718 struct dirent *dent;
1719
1720 dent = readdir(dir);
1721 if (dent == NULL || dent->d_name[0] == '\0')
1722 break;
1723
1724 if (dent->d_name[0] == '.')
1725 continue;
1726
1727 /* look for file matching with specified suffix */
1728 if (suffix != NULL) {
1729 const char *ext;
1730
1731 ext = strrchr(dent->d_name, '.');
1732 if (ext == NULL)
1733 continue;
1734 if (strcmp(ext, suffix) != 0)
1735 continue;
1736 }
1737 util_strscpyl(filename, sizeof(filename), dirname, "/", dent->d_name, NULL);
1738 dbg(udev, "put file '%s' into list\n", filename);
1739 udev_list_entry_add(udev, file_list, filename, NULL, 1, 1);
1740 }
1741
1742 closedir(dir);
1743 return 0;
1744 }
1745
1746 struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
1747 {
1748 struct udev_rules *rules;
1749 struct stat statbuf;
1750 struct udev_list_node file_list;
1751 struct udev_list_entry *file_loop, *file_tmp;
1752 struct token end_token;
1753
1754 rules = calloc(1, sizeof(struct udev_rules));
1755 if (rules == NULL)
1756 return NULL;
1757 rules->udev = udev;
1758 rules->resolve_names = resolve_names;
1759 udev_list_init(&file_list);
1760
1761 /* init token array and string buffer */
1762 rules->tokens = malloc(PREALLOC_TOKEN * sizeof(struct token));
1763 if (rules->tokens == NULL) {
1764 free(rules);
1765 return NULL;
1766 }
1767 rules->token_max = PREALLOC_TOKEN;
1768
1769 rules->buf = malloc(PREALLOC_STRBUF);
1770 if (rules->buf == NULL) {
1771 free(rules->tokens);
1772 free(rules);
1773 return NULL;
1774 }
1775 rules->buf_max = PREALLOC_STRBUF;
1776 /* offset 0 is always '\0' */
1777 rules->buf[0] = '\0';
1778 rules->buf_cur = 1;
1779 dbg(udev, "prealloc %zu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
1780 rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
1781
1782 rules->trie_nodes = malloc(PREALLOC_TRIE * sizeof(struct trie_node));
1783 if (rules->trie_nodes == NULL) {
1784 free(rules->buf);
1785 free(rules->tokens);
1786 free(rules);
1787 return NULL;
1788 }
1789 rules->trie_nodes_max = PREALLOC_TRIE;
1790 /* offset 0 is the trie root, with an empty string */
1791 memset(rules->trie_nodes, 0x00, sizeof(struct trie_node));
1792 rules->trie_nodes_cur = 1;
1793
1794 if (udev_get_rules_path(udev) != NULL) {
1795 /* custom rules location for testing */
1796 add_matching_files(udev, &file_list, udev_get_rules_path(udev), ".rules");
1797 } else {
1798 char filename[PATH_MAX];
1799 struct udev_list_node sort_list;
1800 struct udev_list_entry *sort_loop, *sort_tmp;
1801
1802 /* read user/custom rules */
1803 add_matching_files(udev, &file_list, SYSCONFDIR "/udev/rules.d", ".rules");
1804
1805 /* read dynamic/temporary rules */
1806 util_strscpyl(filename, sizeof(filename), udev_get_run_path(udev), "/rules.d", NULL);
1807 udev_list_init(&sort_list);
1808 add_matching_files(udev, &sort_list, filename, ".rules");
1809
1810 /* read default rules */
1811 add_matching_files(udev, &sort_list, LIBEXECDIR "/rules.d", ".rules");
1812
1813 /* sort all rules files by basename into list of files */
1814 udev_list_entry_foreach_safe(sort_loop, sort_tmp, udev_list_get_entry(&sort_list)) {
1815 const char *sort_name = udev_list_entry_get_name(sort_loop);
1816 const char *sort_base = strrchr(sort_name, '/');
1817
1818 if (sort_base == NULL)
1819 continue;
1820 /* sort entry into existing list */
1821 udev_list_entry_foreach_safe(file_loop, file_tmp, udev_list_get_entry(&file_list)) {
1822 const char *file_name = udev_list_entry_get_name(file_loop);
1823 const char *file_base = strrchr(file_name, '/');
1824
1825 if (file_base == NULL)
1826 continue;
1827 if (strcmp(file_base, sort_base) == 0) {
1828 info(udev, "rule file basename '%s' already added, ignoring '%s'\n",
1829 file_name, sort_name);
1830 udev_list_entry_delete(sort_loop);
1831 sort_loop = NULL;
1832 break;
1833 }
1834 if (strcmp(file_base, sort_base) > 0) {
1835 /* found later file, insert before */
1836 udev_list_entry_remove(sort_loop);
1837 udev_list_entry_insert_before(sort_loop, file_loop);
1838 sort_loop = NULL;
1839 break;
1840 }
1841 }
1842 /* current file already handled */
1843 if (sort_loop == NULL)
1844 continue;
1845 /* no later file, append to end of list */
1846 udev_list_entry_remove(sort_loop);
1847 udev_list_entry_append(sort_loop, &file_list);
1848 }
1849 }
1850
1851 /* add all filenames to the string buffer */
1852 udev_list_entry_foreach(file_loop, udev_list_get_entry(&file_list)) {
1853 const char *filename = udev_list_entry_get_name(file_loop);
1854 unsigned int filename_off;
1855
1856 filename_off = add_string(rules, filename);
1857 /* the offset in the rule is limited to unsigned short */
1858 if (filename_off < USHRT_MAX)
1859 udev_list_entry_set_flags(file_loop, filename_off);
1860 }
1861
1862 /* parse list of files */
1863 udev_list_entry_foreach_safe(file_loop, file_tmp, udev_list_get_entry(&file_list)) {
1864 const char *filename = udev_list_entry_get_name(file_loop);
1865 unsigned int filename_off = udev_list_entry_get_flags(file_loop);
1866
1867 if (stat(filename, &statbuf) == 0 && statbuf.st_size > 0)
1868 parse_file(rules, filename, filename_off);
1869 else
1870 err(udev, "can not read '%s'\n", filename);
1871 udev_list_entry_delete(file_loop);
1872 }
1873
1874 memset(&end_token, 0x00, sizeof(struct token));
1875 end_token.type = TK_END;
1876 add_token(rules, &end_token);
1877
1878 /* shrink allocated token and string buffer */
1879 if (rules->token_cur < rules->token_max) {
1880 struct token *tokens;
1881
1882 tokens = realloc(rules->tokens, rules->token_cur * sizeof(struct token));
1883 if (tokens != NULL || rules->token_cur == 0) {
1884 rules->tokens = tokens;
1885 rules->token_max = rules->token_cur;
1886 }
1887 }
1888 if (rules->buf_cur < rules->buf_max) {
1889 char *buf;
1890
1891 buf = realloc(rules->buf, rules->buf_cur);
1892 if (buf != NULL || rules->buf_cur == 0) {
1893 rules->buf = buf;
1894 rules->buf_max = rules->buf_cur;
1895 }
1896 }
1897 info(udev, "rules use %zu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
1898 rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
1899 info(udev, "temporary index used %zu bytes (%u * %zu bytes)\n",
1900 rules->trie_nodes_cur * sizeof(struct trie_node),
1901 rules->trie_nodes_cur, sizeof(struct trie_node));
1902
1903 /* cleanup trie */
1904 free(rules->trie_nodes);
1905 rules->trie_nodes = NULL;
1906 rules->trie_nodes_cur = 0;
1907 rules->trie_nodes_max = 0;
1908
1909 /* cleanup uid/gid cache */
1910 free(rules->uids);
1911 rules->uids = NULL;
1912 rules->uids_cur = 0;
1913 rules->uids_max = 0;
1914 free(rules->gids);
1915 rules->gids = NULL;
1916 rules->gids_cur = 0;
1917 rules->gids_max = 0;
1918
1919 dump_rules(rules);
1920 return rules;
1921 }
1922
1923 void udev_rules_unref(struct udev_rules *rules)
1924 {
1925 if (rules == NULL)
1926 return;
1927 free(rules->tokens);
1928 free(rules->buf);
1929 free(rules->trie_nodes);
1930 free(rules->uids);
1931 free(rules->gids);
1932 free(rules);
1933 }
1934
1935 static int match_key(struct udev_rules *rules, struct token *token, const char *val)
1936 {
1937 char *key_value = &rules->buf[token->key.value_off];
1938 char *pos;
1939 bool match = false;
1940
1941 if (val == NULL)
1942 val = "";
1943
1944 switch (token->key.glob) {
1945 case GL_PLAIN:
1946 match = (strcmp(key_value, val) == 0);
1947 break;
1948 case GL_GLOB:
1949 match = (fnmatch(key_value, val, 0) == 0);
1950 break;
1951 case GL_SPLIT:
1952 {
1953 const char *split;
1954 size_t len;
1955
1956 split = &rules->buf[token->key.value_off];
1957 len = strlen(val);
1958 for (;;) {
1959 const char *next;
1960
1961 next = strchr(split, '|');
1962 if (next != NULL) {
1963 size_t matchlen = (size_t)(next - split);
1964
1965 match = (matchlen == len && strncmp(split, val, matchlen) == 0);
1966 if (match)
1967 break;
1968 } else {
1969 match = (strcmp(split, val) == 0);
1970 break;
1971 }
1972 split = &next[1];
1973 }
1974 break;
1975 }
1976 case GL_SPLIT_GLOB:
1977 {
1978 char value[UTIL_PATH_SIZE];
1979
1980 util_strscpy(value, sizeof(value), &rules->buf[token->key.value_off]);
1981 key_value = value;
1982 while (key_value != NULL) {
1983 pos = strchr(key_value, '|');
1984 if (pos != NULL) {
1985 pos[0] = '\0';
1986 pos = &pos[1];
1987 }
1988 dbg(rules->udev, "match %s '%s' <-> '%s'\n", token_str(token->type), key_value, val);
1989 match = (fnmatch(key_value, val, 0) == 0);
1990 if (match)
1991 break;
1992 key_value = pos;
1993 }
1994 break;
1995 }
1996 case GL_SOMETHING:
1997 match = (val[0] != '\0');
1998 break;
1999 case GL_UNSET:
2000 return -1;
2001 }
2002
2003 if (match && (token->key.op == OP_MATCH)) {
2004 dbg(rules->udev, "%s is true (matching value)\n", token_str(token->type));
2005 return 0;
2006 }
2007 if (!match && (token->key.op == OP_NOMATCH)) {
2008 dbg(rules->udev, "%s is true (non-matching value)\n", token_str(token->type));
2009 return 0;
2010 }
2011 dbg(rules->udev, "%s is not true\n", token_str(token->type));
2012 return -1;
2013 }
2014
2015 static int match_attr(struct udev_rules *rules, struct udev_device *dev, struct udev_event *event, struct token *cur)
2016 {
2017 const char *name;
2018 char nbuf[UTIL_NAME_SIZE];
2019 const char *value;
2020 char vbuf[UTIL_NAME_SIZE];
2021 size_t len;
2022
2023 name = &rules->buf[cur->key.attr_off];
2024 switch (cur->key.attrsubst) {
2025 case SB_FORMAT:
2026 udev_event_apply_format(event, name, nbuf, sizeof(nbuf));
2027 name = nbuf;
2028 /* fall through */
2029 case SB_NONE:
2030 value = udev_device_get_sysattr_value(dev, name);
2031 if (value == NULL)
2032 return -1;
2033 break;
2034 case SB_SUBSYS:
2035 if (util_resolve_subsys_kernel(event->udev, name, vbuf, sizeof(vbuf), 1) != 0)
2036 return -1;
2037 value = vbuf;
2038 break;
2039 default:
2040 return -1;
2041 }
2042
2043 /* remove trailing whitespace, if not asked to match for it */
2044 len = strlen(value);
2045 if (len > 0 && isspace(value[len-1])) {
2046 const char *key_value;
2047 size_t klen;
2048
2049 key_value = &rules->buf[cur->key.value_off];
2050 klen = strlen(key_value);
2051 if (klen > 0 && !isspace(key_value[klen-1])) {
2052 if (value != vbuf) {
2053 util_strscpy(vbuf, sizeof(vbuf), value);
2054 value = vbuf;
2055 }
2056 while (len > 0 && isspace(vbuf[--len]))
2057 vbuf[len] = '\0';
2058 dbg(rules->udev, "removed trailing whitespace from '%s'\n", value);
2059 }
2060 }
2061
2062 return match_key(rules, cur, value);
2063 }
2064
2065 enum escape_type {
2066 ESCAPE_UNSET,
2067 ESCAPE_NONE,
2068 ESCAPE_REPLACE,
2069 };
2070
2071 int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event)
2072 {
2073 struct token *cur;
2074 struct token *rule;
2075 enum escape_type esc = ESCAPE_UNSET;
2076 bool can_set_name;
2077
2078 if (rules->tokens == NULL)
2079 return -1;
2080
2081 can_set_name = ((strcmp(udev_device_get_action(event->dev), "remove") != 0) &&
2082 (major(udev_device_get_devnum(event->dev)) > 0 ||
2083 udev_device_get_ifindex(event->dev) > 0));
2084
2085 /* loop through token list, match, run actions or forward to next rule */
2086 cur = &rules->tokens[0];
2087 rule = cur;
2088 for (;;) {
2089 dump_token(rules, cur);
2090 switch (cur->type) {
2091 case TK_RULE:
2092 /* current rule */
2093 rule = cur;
2094 /* possibly skip rules which want to set NAME, SYMLINK, OWNER, GROUP, MODE */
2095 if (!can_set_name && rule->rule.can_set_name)
2096 goto nomatch;
2097 esc = ESCAPE_UNSET;
2098 break;
2099 case TK_M_ACTION:
2100 if (match_key(rules, cur, udev_device_get_action(event->dev)) != 0)
2101 goto nomatch;
2102 break;
2103 case TK_M_DEVPATH:
2104 if (match_key(rules, cur, udev_device_get_devpath(event->dev)) != 0)
2105 goto nomatch;
2106 break;
2107 case TK_M_KERNEL:
2108 if (match_key(rules, cur, udev_device_get_sysname(event->dev)) != 0)
2109 goto nomatch;
2110 break;
2111 case TK_M_DEVLINK:
2112 {
2113 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
2114 struct udev_list_entry *list_entry;
2115 bool match = false;
2116
2117 udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(event->dev)) {
2118 const char *devlink;
2119
2120 devlink = &udev_list_entry_get_name(list_entry)[devlen];
2121 if (match_key(rules, cur, devlink) == 0) {
2122 match = true;
2123 break;
2124 }
2125 }
2126 if (!match)
2127 goto nomatch;
2128 break;
2129 }
2130 case TK_M_NAME:
2131 if (match_key(rules, cur, event->name) != 0)
2132 goto nomatch;
2133 break;
2134 case TK_M_ENV:
2135 {
2136 const char *key_name = &rules->buf[cur->key.attr_off];
2137 const char *value;
2138
2139 value = udev_device_get_property_value(event->dev, key_name);
2140 if (value == NULL) {
2141 dbg(event->udev, "ENV{%s} is not set, treat as empty\n", key_name);
2142 value = "";
2143 }
2144 if (match_key(rules, cur, value))
2145 goto nomatch;
2146 break;
2147 }
2148 case TK_M_TAG:
2149 {
2150 struct udev_list_entry *list_entry;
2151 bool match = false;
2152
2153 udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(event->dev)) {
2154 if (strcmp(&rules->buf[cur->key.value_off], udev_list_entry_get_name(list_entry)) == 0) {
2155 match = true;
2156 break;
2157 }
2158 }
2159 if (!match && (cur->key.op != OP_NOMATCH))
2160 goto nomatch;
2161 break;
2162 }
2163 case TK_M_SUBSYSTEM:
2164 if (match_key(rules, cur, udev_device_get_subsystem(event->dev)) != 0)
2165 goto nomatch;
2166 break;
2167 case TK_M_DRIVER:
2168 if (match_key(rules, cur, udev_device_get_driver(event->dev)) != 0)
2169 goto nomatch;
2170 break;
2171 case TK_M_WAITFOR:
2172 {
2173 char filename[UTIL_PATH_SIZE];
2174 int found;
2175
2176 udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2177 found = (wait_for_file(event->dev, filename, 10) == 0);
2178 if (!found && (cur->key.op != OP_NOMATCH))
2179 goto nomatch;
2180 break;
2181 }
2182 case TK_M_ATTR:
2183 if (match_attr(rules, event->dev, event, cur) != 0)
2184 goto nomatch;
2185 break;
2186 case TK_M_KERNELS:
2187 case TK_M_SUBSYSTEMS:
2188 case TK_M_DRIVERS:
2189 case TK_M_ATTRS:
2190 {
2191 struct token *next;
2192
2193 /* get whole sequence of parent matches */
2194 next = cur;
2195 while (next->type > TK_M_PARENTS_MIN && next->type < TK_M_PARENTS_MAX)
2196 next++;
2197
2198 /* loop over parents */
2199 event->dev_parent = event->dev;
2200 for (;;) {
2201 struct token *key;
2202
2203 dbg(event->udev, "parent: '%s'\n", udev_device_get_syspath(event->dev_parent));
2204 /* loop over sequence of parent match keys */
2205 for (key = cur; key < next; key++ ) {
2206 dump_token(rules, key);
2207 switch(key->type) {
2208 case TK_M_KERNELS:
2209 if (match_key(rules, key, udev_device_get_sysname(event->dev_parent)) != 0)
2210 goto try_parent;
2211 break;
2212 case TK_M_SUBSYSTEMS:
2213 if (match_key(rules, key, udev_device_get_subsystem(event->dev_parent)) != 0)
2214 goto try_parent;
2215 break;
2216 case TK_M_DRIVERS:
2217 if (match_key(rules, key, udev_device_get_driver(event->dev_parent)) != 0)
2218 goto try_parent;
2219 break;
2220 case TK_M_ATTRS:
2221 if (match_attr(rules, event->dev_parent, event, key) != 0)
2222 goto try_parent;
2223 break;
2224 default:
2225 goto nomatch;
2226 }
2227 dbg(event->udev, "parent key matched\n");
2228 }
2229 dbg(event->udev, "all parent keys matched\n");
2230 /* all keys matched */
2231 break;
2232
2233 try_parent:
2234 event->dev_parent = udev_device_get_parent(event->dev_parent);
2235 if (event->dev_parent == NULL)
2236 goto nomatch;
2237 }
2238 /* move behind our sequence of parent match keys */
2239 cur = next;
2240 continue;
2241 }
2242 case TK_M_TEST:
2243 {
2244 char filename[UTIL_PATH_SIZE];
2245 struct stat statbuf;
2246 int match;
2247
2248 udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2249 if (util_resolve_subsys_kernel(event->udev, filename, filename, sizeof(filename), 0) != 0) {
2250 if (filename[0] != '/') {
2251 char tmp[UTIL_PATH_SIZE];
2252
2253 util_strscpy(tmp, sizeof(tmp), filename);
2254 util_strscpyl(filename, sizeof(filename),
2255 udev_device_get_syspath(event->dev), "/", tmp, NULL);
2256 }
2257 }
2258 attr_subst_subdir(filename, sizeof(filename));
2259
2260 match = (stat(filename, &statbuf) == 0);
2261 dbg(event->udev, "'%s' %s", filename, match ? "exists\n" : "does not exist\n");
2262 if (match && cur->key.mode > 0) {
2263 match = ((statbuf.st_mode & cur->key.mode) > 0);
2264 dbg(event->udev, "'%s' has mode=%#o and %s %#o\n", filename, statbuf.st_mode,
2265 match ? "matches" : "does not match", cur->key.mode);
2266 }
2267 if (match && cur->key.op == OP_NOMATCH)
2268 goto nomatch;
2269 if (!match && cur->key.op == OP_MATCH)
2270 goto nomatch;
2271 break;
2272 }
2273 case TK_M_PROGRAM:
2274 {
2275 char program[UTIL_PATH_SIZE];
2276 char **envp;
2277 char result[UTIL_PATH_SIZE];
2278
2279 free(event->program_result);
2280 event->program_result = NULL;
2281 udev_event_apply_format(event, &rules->buf[cur->key.value_off], program, sizeof(program));
2282 envp = udev_device_get_properties_envp(event->dev);
2283 info(event->udev, "PROGRAM '%s' %s:%u\n",
2284 program,
2285 &rules->buf[rule->rule.filename_off],
2286 rule->rule.filename_line);
2287 if (util_run_program(event->udev, program, envp, result, sizeof(result), NULL, NULL, false) != 0) {
2288 if (cur->key.op != OP_NOMATCH)
2289 goto nomatch;
2290 } else {
2291 int count;
2292
2293 util_remove_trailing_chars(result, '\n');
2294 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2295 count = udev_util_replace_chars(result, UDEV_ALLOWED_CHARS_INPUT);
2296 if (count > 0)
2297 info(event->udev, "%i character(s) replaced\n" , count);
2298 }
2299 event->program_result = strdup(result);
2300 dbg(event->udev, "storing result '%s'\n", event->program_result);
2301 if (cur->key.op == OP_NOMATCH)
2302 goto nomatch;
2303 }
2304 break;
2305 }
2306 case TK_M_IMPORT_FILE:
2307 {
2308 char import[UTIL_PATH_SIZE];
2309
2310 udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2311 if (import_file_into_properties(event->dev, import) != 0)
2312 if (cur->key.op != OP_NOMATCH)
2313 goto nomatch;
2314 break;
2315 }
2316 case TK_M_IMPORT_PROG:
2317 {
2318 char import[UTIL_PATH_SIZE];
2319
2320 udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2321 info(event->udev, "IMPORT '%s' %s:%u\n",
2322 import,
2323 &rules->buf[rule->rule.filename_off],
2324 rule->rule.filename_line);
2325 if (import_program_into_properties(event->dev, import) != 0)
2326 if (cur->key.op != OP_NOMATCH)
2327 goto nomatch;
2328 break;
2329 }
2330 case TK_M_IMPORT_DB:
2331 {
2332 const char *key = &rules->buf[cur->key.value_off];
2333 const char *value;
2334
2335 value = udev_device_get_property_value(event->dev_db, key);
2336 if (value != NULL) {
2337 struct udev_list_entry *entry;
2338
2339 entry = udev_device_add_property(event->dev, key, value);
2340 udev_list_entry_set_flags(entry, 1);
2341 } else {
2342 if (cur->key.op != OP_NOMATCH)
2343 goto nomatch;
2344 }
2345 break;
2346 }
2347 case TK_M_IMPORT_CMDLINE:
2348 {
2349 FILE *f;
2350 bool imported = false;
2351
2352 f = fopen("/proc/cmdline", "r");
2353 if (f != NULL) {
2354 char cmdline[4096];
2355
2356 if (fgets(cmdline, sizeof(cmdline), f) != NULL) {
2357 const char *key = &rules->buf[cur->key.value_off];
2358 char *pos;
2359
2360 pos = strstr(cmdline, key);
2361 if (pos != NULL) {
2362 struct udev_list_entry *entry;
2363
2364 pos += strlen(key);
2365 if (pos[0] == '\0' || isspace(pos[0])) {
2366 /* we import simple flags as 'FLAG=1' */
2367 entry = udev_device_add_property(event->dev, key, "1");
2368 udev_list_entry_set_flags(entry, 1);
2369 imported = true;
2370 } else if (pos[0] == '=') {
2371 const char *value;
2372
2373 pos++;
2374 value = pos;
2375 while (pos[0] != '\0' && !isspace(pos[0]))
2376 pos++;
2377 pos[0] = '\0';
2378 entry = udev_device_add_property(event->dev, key, value);
2379 udev_list_entry_set_flags(entry, 1);
2380 imported = true;
2381 }
2382 }
2383 }
2384 fclose(f);
2385 }
2386 if (!imported && cur->key.op != OP_NOMATCH)
2387 goto nomatch;
2388 break;
2389 }
2390 case TK_M_IMPORT_PARENT:
2391 {
2392 char import[UTIL_PATH_SIZE];
2393
2394 udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2395 if (import_parent_into_properties(event->dev, import) != 0)
2396 if (cur->key.op != OP_NOMATCH)
2397 goto nomatch;
2398 break;
2399 }
2400 case TK_M_RESULT:
2401 if (match_key(rules, cur, event->program_result) != 0)
2402 goto nomatch;
2403 break;
2404 case TK_A_STRING_ESCAPE_NONE:
2405 esc = ESCAPE_NONE;
2406 break;
2407 case TK_A_STRING_ESCAPE_REPLACE:
2408 esc = ESCAPE_REPLACE;
2409 break;
2410 case TK_A_INOTIFY_WATCH:
2411 if (event->inotify_watch_final)
2412 break;
2413 if (cur->key.op == OP_ASSIGN_FINAL)
2414 event->inotify_watch_final = true;
2415 event->inotify_watch = cur->key.watch;
2416 break;
2417 case TK_A_DEVLINK_PRIO:
2418 udev_device_set_devlink_priority(event->dev, cur->key.devlink_prio);
2419 break;
2420 case TK_A_OWNER:
2421 {
2422 char owner[UTIL_NAME_SIZE];
2423
2424 if (event->owner_final)
2425 break;
2426 if (cur->key.op == OP_ASSIGN_FINAL)
2427 event->owner_final = true;
2428 udev_event_apply_format(event, &rules->buf[cur->key.value_off], owner, sizeof(owner));
2429 event->uid = util_lookup_user(event->udev, owner);
2430 info(event->udev, "OWNER %u %s:%u\n",
2431 event->uid,
2432 &rules->buf[rule->rule.filename_off],
2433 rule->rule.filename_line);
2434 break;
2435 }
2436 case TK_A_GROUP:
2437 {
2438 char group[UTIL_NAME_SIZE];
2439
2440 if (event->group_final)
2441 break;
2442 if (cur->key.op == OP_ASSIGN_FINAL)
2443 event->group_final = true;
2444 udev_event_apply_format(event, &rules->buf[cur->key.value_off], group, sizeof(group));
2445 event->gid = util_lookup_group(event->udev, group);
2446 info(event->udev, "GROUP %u %s:%u\n",
2447 event->gid,
2448 &rules->buf[rule->rule.filename_off],
2449 rule->rule.filename_line);
2450 break;
2451 }
2452 case TK_A_MODE:
2453 {
2454 char mode[UTIL_NAME_SIZE];
2455 char *endptr;
2456
2457 if (event->mode_final)
2458 break;
2459 if (cur->key.op == OP_ASSIGN_FINAL)
2460 event->mode_final = true;
2461 udev_event_apply_format(event, &rules->buf[cur->key.value_off], mode, sizeof(mode));
2462 event->mode = strtol(mode, &endptr, 8);
2463 if (endptr[0] != '\0') {
2464 err(event->udev, "invalide mode '%s' set default mode 0600\n", mode);
2465 event->mode = 0600;
2466 }
2467 info(event->udev, "MODE %#o %s:%u\n",
2468 event->mode,
2469 &rules->buf[rule->rule.filename_off],
2470 rule->rule.filename_line);
2471 break;
2472 }
2473 case TK_A_OWNER_ID:
2474 if (event->owner_final)
2475 break;
2476 if (cur->key.op == OP_ASSIGN_FINAL)
2477 event->owner_final = true;
2478 event->uid = cur->key.uid;
2479 info(event->udev, "OWNER %u %s:%u\n",
2480 event->uid,
2481 &rules->buf[rule->rule.filename_off],
2482 rule->rule.filename_line);
2483 break;
2484 case TK_A_GROUP_ID:
2485 if (event->group_final)
2486 break;
2487 if (cur->key.op == OP_ASSIGN_FINAL)
2488 event->group_final = true;
2489 event->gid = cur->key.gid;
2490 info(event->udev, "GROUP %u %s:%u\n",
2491 event->gid,
2492 &rules->buf[rule->rule.filename_off],
2493 rule->rule.filename_line);
2494 break;
2495 case TK_A_MODE_ID:
2496 if (event->mode_final)
2497 break;
2498 if (cur->key.op == OP_ASSIGN_FINAL)
2499 event->mode_final = true;
2500 event->mode = cur->key.mode;
2501 info(event->udev, "MODE %#o %s:%u\n",
2502 event->mode,
2503 &rules->buf[rule->rule.filename_off],
2504 rule->rule.filename_line);
2505 break;
2506 case TK_A_STATIC_NODE:
2507 break;
2508 case TK_A_ENV:
2509 {
2510 const char *name = &rules->buf[cur->key.attr_off];
2511 char *value = &rules->buf[cur->key.value_off];
2512
2513 if (value[0] != '\0') {
2514 char temp_value[UTIL_NAME_SIZE];
2515 struct udev_list_entry *entry;
2516
2517 udev_event_apply_format(event, value, temp_value, sizeof(temp_value));
2518 entry = udev_device_add_property(event->dev, name, temp_value);
2519 /* store in db, skip private keys */
2520 if (name[0] != '.')
2521 udev_list_entry_set_flags(entry, 1);
2522 } else {
2523 udev_device_add_property(event->dev, name, NULL);
2524 }
2525 break;
2526 }
2527 case TK_A_TAG:
2528 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2529 udev_device_cleanup_tags_list(event->dev);
2530 udev_device_add_tag(event->dev, &rules->buf[cur->key.value_off]);
2531 break;
2532 case TK_A_NAME:
2533 {
2534 const char *name = &rules->buf[cur->key.value_off];
2535 char name_str[UTIL_PATH_SIZE];
2536 int count;
2537
2538 if (event->name_final)
2539 break;
2540 if (cur->key.op == OP_ASSIGN_FINAL)
2541 event->name_final = true;
2542 udev_event_apply_format(event, name, name_str, sizeof(name_str));
2543 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2544 count = udev_util_replace_chars(name_str, "/");
2545 if (count > 0)
2546 info(event->udev, "%i character(s) replaced\n", count);
2547 }
2548 free(event->name);
2549 event->name = strdup(name_str);
2550 info(event->udev, "NAME '%s' %s:%u\n",
2551 event->name,
2552 &rules->buf[rule->rule.filename_off],
2553 rule->rule.filename_line);
2554 break;
2555 }
2556 case TK_A_DEVLINK:
2557 {
2558 char temp[UTIL_PATH_SIZE];
2559 char filename[UTIL_PATH_SIZE];
2560 char *pos, *next;
2561 int count = 0;
2562
2563 if (event->devlink_final)
2564 break;
2565 if (major(udev_device_get_devnum(event->dev)) == 0)
2566 break;
2567 if (cur->key.op == OP_ASSIGN_FINAL)
2568 event->devlink_final = true;
2569 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2570 udev_device_cleanup_devlinks_list(event->dev);
2571
2572 /* allow multiple symlinks separated by spaces */
2573 udev_event_apply_format(event, &rules->buf[cur->key.value_off], temp, sizeof(temp));
2574 if (esc == ESCAPE_UNSET)
2575 count = udev_util_replace_chars(temp, "/ ");
2576 else if (esc == ESCAPE_REPLACE)
2577 count = udev_util_replace_chars(temp, "/");
2578 if (count > 0)
2579 info(event->udev, "%i character(s) replaced\n" , count);
2580 dbg(event->udev, "rule applied, added symlink(s) '%s'\n", temp);
2581 pos = temp;
2582 while (isspace(pos[0]))
2583 pos++;
2584 next = strchr(pos, ' ');
2585 while (next != NULL) {
2586 next[0] = '\0';
2587 info(event->udev, "LINK '%s' %s:%u\n", pos,
2588 &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2589 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", pos, NULL);
2590 udev_device_add_devlink(event->dev, filename, cur->key.devlink_unique);
2591 while (isspace(next[1]))
2592 next++;
2593 pos = &next[1];
2594 next = strchr(pos, ' ');
2595 }
2596 if (pos[0] != '\0') {
2597 info(event->udev, "LINK '%s' %s:%u\n", pos,
2598 &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2599 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", pos, NULL);
2600 udev_device_add_devlink(event->dev, filename, cur->key.devlink_unique);
2601 }
2602 }
2603 break;
2604 case TK_A_EVENT_TIMEOUT:
2605 udev_device_set_event_timeout(event->dev, cur->key.event_timeout);
2606 break;
2607 case TK_A_ATTR:
2608 {
2609 const char *key_name = &rules->buf[cur->key.attr_off];
2610 char attr[UTIL_PATH_SIZE];
2611 char value[UTIL_NAME_SIZE];
2612 FILE *f;
2613
2614 if (util_resolve_subsys_kernel(event->udev, key_name, attr, sizeof(attr), 0) != 0)
2615 util_strscpyl(attr, sizeof(attr), udev_device_get_syspath(event->dev), "/", key_name, NULL);
2616 attr_subst_subdir(attr, sizeof(attr));
2617
2618 udev_event_apply_format(event, &rules->buf[cur->key.value_off], value, sizeof(value));
2619 info(event->udev, "ATTR '%s' writing '%s' %s:%u\n", attr, value,
2620 &rules->buf[rule->rule.filename_off],
2621 rule->rule.filename_line);
2622 f = fopen(attr, "w");
2623 if (f != NULL) {
2624 if (fprintf(f, "%s", value) <= 0)
2625 err(event->udev, "error writing ATTR{%s}: %m\n", attr);
2626 fclose(f);
2627 } else {
2628 err(event->udev, "error opening ATTR{%s} for writing: %m\n", attr);
2629 }
2630 break;
2631 }
2632 case TK_A_RUN:
2633 {
2634 struct udev_list_entry *list_entry;
2635
2636 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2637 udev_list_cleanup_entries(event->udev, &event->run_list);
2638 info(event->udev, "RUN '%s' %s:%u\n",
2639 &rules->buf[cur->key.value_off],
2640 &rules->buf[rule->rule.filename_off],
2641 rule->rule.filename_line);
2642 list_entry = udev_list_entry_add(event->udev, &event->run_list,
2643 &rules->buf[cur->key.value_off], NULL, 1, 0);
2644 if (cur->key.fail_on_error)
2645 udev_list_entry_set_flags(list_entry, 1);
2646 break;
2647 }
2648 case TK_A_GOTO:
2649 if (cur->key.rule_goto == 0)
2650 break;
2651 cur = &rules->tokens[cur->key.rule_goto];
2652 continue;
2653 case TK_END:
2654 return 0;
2655
2656 case TK_M_PARENTS_MIN:
2657 case TK_M_PARENTS_MAX:
2658 case TK_M_MAX:
2659 case TK_UNSET:
2660 err(rules->udev, "wrong type %u\n", cur->type);
2661 goto nomatch;
2662 }
2663
2664 cur++;
2665 continue;
2666 nomatch:
2667 /* fast-forward to next rule */
2668 cur = rule + rule->rule.token_count;
2669 dbg(rules->udev, "forward to rule: %u\n",
2670 (unsigned int) (cur - rules->tokens));
2671 }
2672 }
2673
2674 void udev_rules_apply_static_dev_perms(struct udev_rules *rules)
2675 {
2676 struct token *cur;
2677 struct token *rule;
2678 uid_t uid = 0;
2679 gid_t gid = 0;
2680 mode_t mode = 0;
2681
2682 if (rules->tokens == NULL)
2683 return;
2684
2685 cur = &rules->tokens[0];
2686 rule = cur;
2687 for (;;) {
2688 switch (cur->type) {
2689 case TK_RULE:
2690 /* current rule */
2691 rule = cur;
2692
2693 /* skip rules without a static_node tag */
2694 if (!rule->rule.has_static_node)
2695 goto next;
2696
2697 uid = 0;
2698 gid = 0;
2699 mode = 0;
2700 break;
2701 case TK_A_OWNER_ID:
2702 uid = cur->key.uid;
2703 break;
2704 case TK_A_GROUP_ID:
2705 gid = cur->key.gid;
2706 break;
2707 case TK_A_MODE_ID:
2708 mode = cur->key.mode;
2709 break;
2710 case TK_A_STATIC_NODE: {
2711 char filename[UTIL_PATH_SIZE];
2712 struct stat stats;
2713 /* we assure, that the permissions tokens are sorted before the static token */
2714 if (mode == 0 && uid == 0 && gid == 0)
2715 goto next;
2716 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(rules->udev), "/",
2717 &rules->buf[cur->key.value_off], NULL);
2718 if (stat(filename, &stats) != 0)
2719 goto next;
2720 if (!S_ISBLK(stats.st_mode) && !S_ISCHR(stats.st_mode))
2721 goto next;
2722 if (mode != 0 && mode != (stats.st_mode & 0777)) {
2723 chmod(filename, mode);
2724 info(rules->udev, "chmod '%s' %#o\n", filename, mode);
2725 }
2726 if ((uid != 0 && uid != stats.st_uid) || (gid != 0 && gid != stats.st_gid)) {
2727 chown(filename, uid, gid);
2728 info(rules->udev, "chown '%s' %u %u\n", filename, uid, gid);
2729 }
2730 utimensat(AT_FDCWD, filename, NULL, 0);
2731 break;
2732 }
2733 case TK_END:
2734 return;
2735 }
2736
2737 cur++;
2738 continue;
2739 next:
2740 /* fast-forward to next rule */
2741 cur = rule + rule->rule.token_count;
2742 continue;
2743 }
2744 }
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