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udev: fix RUN+= logic regarding builtin vs. program
[thirdparty/systemd.git] / src / 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_TAGS, /* val */
140 TK_M_PARENTS_MAX,
141
142 TK_M_TEST, /* val, mode_t */
143 TK_M_EVENT_TIMEOUT, /* int */
144 TK_M_PROGRAM, /* val */
145 TK_M_IMPORT_FILE, /* val */
146 TK_M_IMPORT_PROG, /* val */
147 TK_M_IMPORT_BUILTIN, /* val */
148 TK_M_IMPORT_DB, /* val */
149 TK_M_IMPORT_CMDLINE, /* val */
150 TK_M_IMPORT_PARENT, /* val */
151 TK_M_RESULT, /* val */
152 TK_M_MAX,
153
154 TK_A_STRING_ESCAPE_NONE,
155 TK_A_STRING_ESCAPE_REPLACE,
156 TK_A_DB_PERSIST,
157 TK_A_INOTIFY_WATCH, /* int */
158 TK_A_DEVLINK_PRIO, /* int */
159 TK_A_OWNER, /* val */
160 TK_A_GROUP, /* val */
161 TK_A_MODE, /* val */
162 TK_A_OWNER_ID, /* uid_t */
163 TK_A_GROUP_ID, /* gid_t */
164 TK_A_MODE_ID, /* mode_t */
165 TK_A_STATIC_NODE, /* val */
166 TK_A_ENV, /* val, attr */
167 TK_A_TAG, /* val */
168 TK_A_NAME, /* val */
169 TK_A_DEVLINK, /* val */
170 TK_A_ATTR, /* val, attr */
171 TK_A_RUN_BUILTIN, /* val, bool */
172 TK_A_RUN_PROGRAM, /* val, bool */
173 TK_A_GOTO, /* size_t */
174
175 TK_END,
176 };
177
178 /* we try to pack stuff in a way that we take only 12 bytes per token */
179 struct token {
180 union {
181 unsigned char type; /* same in rule and key */
182 struct {
183 enum token_type type:8;
184 bool can_set_name:1;
185 bool has_static_node:1;
186 unsigned int unused:6;
187 unsigned short token_count;
188 unsigned int label_off;
189 unsigned short filename_off;
190 unsigned short filename_line;
191 } rule;
192 struct {
193 enum token_type type:8;
194 enum operation_type op:8;
195 enum string_glob_type glob:8;
196 enum string_subst_type subst:4;
197 enum string_subst_type attrsubst:4;
198 unsigned int value_off;
199 union {
200 unsigned int attr_off;
201 int devlink_unique;
202 unsigned int rule_goto;
203 mode_t mode;
204 uid_t uid;
205 gid_t gid;
206 int devlink_prio;
207 int event_timeout;
208 int watch;
209 enum udev_builtin_cmd builtin_cmd;
210 };
211 } key;
212 };
213 };
214
215 #define MAX_TK 64
216 struct rule_tmp {
217 struct udev_rules *rules;
218 struct token rule;
219 struct token token[MAX_TK];
220 unsigned int token_cur;
221 };
222
223 #ifdef DEBUG
224 static const char *operation_str(enum operation_type type)
225 {
226 static const char *operation_strs[] = {
227 [OP_UNSET] = "UNSET",
228 [OP_MATCH] = "match",
229 [OP_NOMATCH] = "nomatch",
230 [OP_MATCH_MAX] = "MATCH_MAX",
231
232 [OP_ADD] = "add",
233 [OP_ASSIGN] = "assign",
234 [OP_ASSIGN_FINAL] = "assign-final",
235 } ;
236
237 return operation_strs[type];
238 }
239
240 static const char *string_glob_str(enum string_glob_type type)
241 {
242 static const char *string_glob_strs[] = {
243 [GL_UNSET] = "UNSET",
244 [GL_PLAIN] = "plain",
245 [GL_GLOB] = "glob",
246 [GL_SPLIT] = "split",
247 [GL_SPLIT_GLOB] = "split-glob",
248 [GL_SOMETHING] = "split-glob",
249 };
250
251 return string_glob_strs[type];
252 }
253
254 static const char *token_str(enum token_type type)
255 {
256 static const char *token_strs[] = {
257 [TK_UNSET] = "UNSET",
258 [TK_RULE] = "RULE",
259
260 [TK_M_ACTION] = "M ACTION",
261 [TK_M_DEVPATH] = "M DEVPATH",
262 [TK_M_KERNEL] = "M KERNEL",
263 [TK_M_DEVLINK] = "M DEVLINK",
264 [TK_M_NAME] = "M NAME",
265 [TK_M_ENV] = "M ENV",
266 [TK_M_TAG] = "M TAG",
267 [TK_M_SUBSYSTEM] = "M SUBSYSTEM",
268 [TK_M_DRIVER] = "M DRIVER",
269 [TK_M_WAITFOR] = "M WAITFOR",
270 [TK_M_ATTR] = "M ATTR",
271
272 [TK_M_PARENTS_MIN] = "M PARENTS_MIN",
273 [TK_M_KERNELS] = "M KERNELS",
274 [TK_M_SUBSYSTEMS] = "M SUBSYSTEMS",
275 [TK_M_DRIVERS] = "M DRIVERS",
276 [TK_M_ATTRS] = "M ATTRS",
277 [TK_M_TAGS] = "M TAGS",
278 [TK_M_PARENTS_MAX] = "M PARENTS_MAX",
279
280 [TK_M_TEST] = "M TEST",
281 [TK_M_EVENT_TIMEOUT] = "M EVENT_TIMEOUT",
282 [TK_M_PROGRAM] = "M PROGRAM",
283 [TK_M_IMPORT_FILE] = "M IMPORT_FILE",
284 [TK_M_IMPORT_PROG] = "M IMPORT_PROG",
285 [TK_M_IMPORT_BUILTIN] = "M IMPORT_BUILTIN",
286 [TK_M_IMPORT_DB] = "M IMPORT_DB",
287 [TK_M_IMPORT_CMDLINE] = "M IMPORT_CMDLINE",
288 [TK_M_IMPORT_PARENT] = "M IMPORT_PARENT",
289 [TK_M_RESULT] = "M RESULT",
290 [TK_M_MAX] = "M MAX",
291
292 [TK_A_STRING_ESCAPE_NONE] = "A STRING_ESCAPE_NONE",
293 [TK_A_STRING_ESCAPE_REPLACE] = "A STRING_ESCAPE_REPLACE",
294 [TK_A_DB_PERSIST] = "A DB_PERSIST",
295 [TK_A_INOTIFY_WATCH] = "A INOTIFY_WATCH",
296 [TK_A_DEVLINK_PRIO] = "A DEVLINK_PRIO",
297 [TK_A_OWNER] = "A OWNER",
298 [TK_A_GROUP] = "A GROUP",
299 [TK_A_MODE] = "A MODE",
300 [TK_A_OWNER_ID] = "A OWNER_ID",
301 [TK_A_GROUP_ID] = "A GROUP_ID",
302 [TK_A_STATIC_NODE] = "A STATIC_NODE",
303 [TK_A_MODE_ID] = "A MODE_ID",
304 [TK_A_ENV] = "A ENV",
305 [TK_A_TAG] = "A ENV",
306 [TK_A_NAME] = "A NAME",
307 [TK_A_DEVLINK] = "A DEVLINK",
308 [TK_A_ATTR] = "A ATTR",
309 [TK_A_RUN_BUILTIN] = "A RUN_BUILTIN",
310 [TK_A_RUN_PROGRAM] = "A RUN_PROGRAM",
311 [TK_A_GOTO] = "A GOTO",
312
313 [TK_END] = "END",
314 };
315
316 return token_strs[type];
317 }
318
319 static void dump_token(struct udev_rules *rules, struct token *token)
320 {
321 enum token_type type = token->type;
322 enum operation_type op = token->key.op;
323 enum string_glob_type glob = token->key.glob;
324 const char *value = &rules->buf[token->key.value_off];
325 const char *attr = &rules->buf[token->key.attr_off];
326
327 switch (type) {
328 case TK_RULE:
329 {
330 const char *tks_ptr = (char *)rules->tokens;
331 const char *tk_ptr = (char *)token;
332 unsigned int idx = (tk_ptr - tks_ptr) / sizeof(struct token);
333
334 log_debug("* RULE %s:%u, token: %u, count: %u, label: '%s'\n",
335 &rules->buf[token->rule.filename_off], token->rule.filename_line,
336 idx, token->rule.token_count,
337 &rules->buf[token->rule.label_off]);
338 break;
339 }
340 case TK_M_ACTION:
341 case TK_M_DEVPATH:
342 case TK_M_KERNEL:
343 case TK_M_SUBSYSTEM:
344 case TK_M_DRIVER:
345 case TK_M_WAITFOR:
346 case TK_M_DEVLINK:
347 case TK_M_NAME:
348 case TK_M_KERNELS:
349 case TK_M_SUBSYSTEMS:
350 case TK_M_DRIVERS:
351 case TK_M_TAGS:
352 case TK_M_PROGRAM:
353 case TK_M_IMPORT_FILE:
354 case TK_M_IMPORT_PROG:
355 case TK_M_IMPORT_DB:
356 case TK_M_IMPORT_CMDLINE:
357 case TK_M_IMPORT_PARENT:
358 case TK_M_RESULT:
359 case TK_A_NAME:
360 case TK_A_DEVLINK:
361 case TK_A_OWNER:
362 case TK_A_GROUP:
363 case TK_A_MODE:
364 case TK_A_RUN_BUILTIN:
365 case TK_A_RUN_PROGRAM:
366 log_debug("%s %s '%s'(%s)\n",
367 token_str(type), operation_str(op), value, string_glob_str(glob));
368 break;
369 case TK_M_IMPORT_BUILTIN:
370 log_debug("%s %i '%s'\n", token_str(type), token->key.builtin_cmd, value);
371 break;
372 case TK_M_ATTR:
373 case TK_M_ATTRS:
374 case TK_M_ENV:
375 case TK_A_ATTR:
376 case TK_A_ENV:
377 log_debug("%s %s '%s' '%s'(%s)\n",
378 token_str(type), operation_str(op), attr, value, string_glob_str(glob));
379 break;
380 case TK_M_TAG:
381 case TK_A_TAG:
382 log_debug("%s %s '%s'\n", token_str(type), operation_str(op), value);
383 break;
384 case TK_A_STRING_ESCAPE_NONE:
385 case TK_A_STRING_ESCAPE_REPLACE:
386 case TK_A_DB_PERSIST:
387 log_debug("%s\n", token_str(type));
388 break;
389 case TK_M_TEST:
390 log_debug("%s %s '%s'(%s) %#o\n",
391 token_str(type), operation_str(op), value, string_glob_str(glob), token->key.mode);
392 break;
393 case TK_A_INOTIFY_WATCH:
394 log_debug("%s %u\n", token_str(type), token->key.watch);
395 break;
396 case TK_A_DEVLINK_PRIO:
397 log_debug("%s %u\n", token_str(type), token->key.devlink_prio);
398 break;
399 case TK_A_OWNER_ID:
400 log_debug("%s %s %u\n", token_str(type), operation_str(op), token->key.uid);
401 break;
402 case TK_A_GROUP_ID:
403 log_debug("%s %s %u\n", token_str(type), operation_str(op), token->key.gid);
404 break;
405 case TK_A_MODE_ID:
406 log_debug("%s %s %#o\n", token_str(type), operation_str(op), token->key.mode);
407 break;
408 case TK_A_STATIC_NODE:
409 log_debug("%s '%s'\n", token_str(type), value);
410 break;
411 case TK_M_EVENT_TIMEOUT:
412 log_debug("%s %u\n", token_str(type), token->key.event_timeout);
413 break;
414 case TK_A_GOTO:
415 log_debug("%s '%s' %u\n", token_str(type), value, token->key.rule_goto);
416 break;
417 case TK_END:
418 log_debug("* %s\n", token_str(type));
419 break;
420 case TK_M_PARENTS_MIN:
421 case TK_M_PARENTS_MAX:
422 case TK_M_MAX:
423 case TK_UNSET:
424 log_debug("unknown type %u\n", type);
425 break;
426 }
427 }
428
429 static void dump_rules(struct udev_rules *rules)
430 {
431 unsigned int i;
432
433 log_debug("dumping %u (%zu bytes) tokens, %u (%zu bytes) strings\n",
434 rules->token_cur,
435 rules->token_cur * sizeof(struct token),
436 rules->buf_count,
437 rules->buf_cur);
438 for(i = 0; i < rules->token_cur; i++)
439 dump_token(rules, &rules->tokens[i]);
440 }
441 #else
442 static inline const char *operation_str(enum operation_type type) { return NULL; }
443 static inline const char *token_str(enum token_type type) { return NULL; }
444 static inline void dump_token(struct udev_rules *rules, struct token *token) {}
445 static inline void dump_rules(struct udev_rules *rules) {}
446 #endif /* DEBUG */
447
448 static int add_new_string(struct udev_rules *rules, const char *str, size_t bytes)
449 {
450 int off;
451
452 /* grow buffer if needed */
453 if (rules->buf_cur + bytes+1 >= rules->buf_max) {
454 char *buf;
455 unsigned int add;
456
457 /* double the buffer size */
458 add = rules->buf_max;
459 if (add < bytes * 8)
460 add = bytes * 8;
461
462 buf = realloc(rules->buf, rules->buf_max + add);
463 if (buf == NULL)
464 return -1;
465 rules->buf = buf;
466 rules->buf_max += add;
467 }
468 off = rules->buf_cur;
469 memcpy(&rules->buf[rules->buf_cur], str, bytes);
470 rules->buf_cur += bytes;
471 rules->buf_count++;
472 return off;
473 }
474
475 static int add_string(struct udev_rules *rules, const char *str)
476 {
477 unsigned int node_idx;
478 struct trie_node *new_node;
479 unsigned int new_node_idx;
480 unsigned char key;
481 unsigned short len;
482 unsigned int depth;
483 unsigned int off;
484 struct trie_node *parent;
485
486 /* walk trie, start from last character of str to find matching tails */
487 len = strlen(str);
488 key = str[len-1];
489 node_idx = 0;
490 for (depth = 0; depth <= len; depth++) {
491 struct trie_node *node;
492 unsigned int child_idx;
493
494 node = &rules->trie_nodes[node_idx];
495 off = node->value_off + node->value_len - len;
496
497 /* match against current node */
498 if (depth == len || (node->value_len >= len && memcmp(&rules->buf[off], str, len) == 0))
499 return off;
500
501 /* lookup child node */
502 key = str[len - 1 - depth];
503 child_idx = node->child_idx;
504 while (child_idx > 0) {
505 struct trie_node *child;
506
507 child = &rules->trie_nodes[child_idx];
508 if (child->key == key)
509 break;
510 child_idx = child->next_child_idx;
511 }
512 if (child_idx == 0)
513 break;
514 node_idx = child_idx;
515 }
516
517 /* string not found, add it */
518 off = add_new_string(rules, str, len + 1);
519
520 /* grow trie nodes if needed */
521 if (rules->trie_nodes_cur >= rules->trie_nodes_max) {
522 struct trie_node *nodes;
523 unsigned int add;
524
525 /* double the buffer size */
526 add = rules->trie_nodes_max;
527 if (add < 8)
528 add = 8;
529
530 nodes = realloc(rules->trie_nodes, (rules->trie_nodes_max + add) * sizeof(struct trie_node));
531 if (nodes == NULL)
532 return -1;
533 rules->trie_nodes = nodes;
534 rules->trie_nodes_max += add;
535 }
536
537 /* get a new node */
538 new_node_idx = rules->trie_nodes_cur;
539 rules->trie_nodes_cur++;
540 new_node = &rules->trie_nodes[new_node_idx];
541 memset(new_node, 0x00, sizeof(struct trie_node));
542 new_node->value_off = off;
543 new_node->value_len = len;
544 new_node->key = key;
545
546 /* join the parent's child list */
547 parent = &rules->trie_nodes[node_idx];
548 if (parent->child_idx == 0) {
549 parent->child_idx = new_node_idx;
550 } else {
551 struct trie_node *last_child;
552
553 last_child = &rules->trie_nodes[parent->last_child_idx];
554 last_child->next_child_idx = new_node_idx;
555 }
556 parent->last_child_idx = new_node_idx;
557 return off;
558 }
559
560 static int add_token(struct udev_rules *rules, struct token *token)
561 {
562 /* grow buffer if needed */
563 if (rules->token_cur+1 >= rules->token_max) {
564 struct token *tokens;
565 unsigned int add;
566
567 /* double the buffer size */
568 add = rules->token_max;
569 if (add < 8)
570 add = 8;
571
572 tokens = realloc(rules->tokens, (rules->token_max + add ) * sizeof(struct token));
573 if (tokens == NULL)
574 return -1;
575 rules->tokens = tokens;
576 rules->token_max += add;
577 }
578 memcpy(&rules->tokens[rules->token_cur], token, sizeof(struct token));
579 rules->token_cur++;
580 return 0;
581 }
582
583 static uid_t add_uid(struct udev_rules *rules, const char *owner)
584 {
585 unsigned int i;
586 uid_t uid;
587 unsigned int off;
588
589 /* lookup, if we know it already */
590 for (i = 0; i < rules->uids_cur; i++) {
591 off = rules->uids[i].name_off;
592 if (strcmp(&rules->buf[off], owner) == 0) {
593 uid = rules->uids[i].uid;
594 return uid;
595 }
596 }
597 uid = util_lookup_user(rules->udev, owner);
598
599 /* grow buffer if needed */
600 if (rules->uids_cur+1 >= rules->uids_max) {
601 struct uid_gid *uids;
602 unsigned int add;
603
604 /* double the buffer size */
605 add = rules->uids_max;
606 if (add < 1)
607 add = 8;
608
609 uids = realloc(rules->uids, (rules->uids_max + add ) * sizeof(struct uid_gid));
610 if (uids == NULL)
611 return uid;
612 rules->uids = uids;
613 rules->uids_max += add;
614 }
615 rules->uids[rules->uids_cur].uid = uid;
616 off = add_string(rules, owner);
617 if (off <= 0)
618 return uid;
619 rules->uids[rules->uids_cur].name_off = off;
620 rules->uids_cur++;
621 return uid;
622 }
623
624 static gid_t add_gid(struct udev_rules *rules, const char *group)
625 {
626 unsigned int i;
627 gid_t gid;
628 unsigned int off;
629
630 /* lookup, if we know it already */
631 for (i = 0; i < rules->gids_cur; i++) {
632 off = rules->gids[i].name_off;
633 if (strcmp(&rules->buf[off], group) == 0) {
634 gid = rules->gids[i].gid;
635 return gid;
636 }
637 }
638 gid = util_lookup_group(rules->udev, group);
639
640 /* grow buffer if needed */
641 if (rules->gids_cur+1 >= rules->gids_max) {
642 struct uid_gid *gids;
643 unsigned int add;
644
645 /* double the buffer size */
646 add = rules->gids_max;
647 if (add < 1)
648 add = 8;
649
650 gids = realloc(rules->gids, (rules->gids_max + add ) * sizeof(struct uid_gid));
651 if (gids == NULL)
652 return gid;
653 rules->gids = gids;
654 rules->gids_max += add;
655 }
656 rules->gids[rules->gids_cur].gid = gid;
657 off = add_string(rules, group);
658 if (off <= 0)
659 return gid;
660 rules->gids[rules->gids_cur].name_off = off;
661 rules->gids_cur++;
662 return gid;
663 }
664
665 static int import_property_from_string(struct udev_device *dev, char *line)
666 {
667 struct udev *udev = udev_device_get_udev(dev);
668 char *key;
669 char *val;
670 size_t len;
671
672 /* find key */
673 key = line;
674 while (isspace(key[0]))
675 key++;
676
677 /* comment or empty line */
678 if (key[0] == '#' || key[0] == '\0')
679 return -1;
680
681 /* split key/value */
682 val = strchr(key, '=');
683 if (val == NULL)
684 return -1;
685 val[0] = '\0';
686 val++;
687
688 /* find value */
689 while (isspace(val[0]))
690 val++;
691
692 /* terminate key */
693 len = strlen(key);
694 if (len == 0)
695 return -1;
696 while (isspace(key[len-1]))
697 len--;
698 key[len] = '\0';
699
700 /* terminate value */
701 len = strlen(val);
702 if (len == 0)
703 return -1;
704 while (isspace(val[len-1]))
705 len--;
706 val[len] = '\0';
707
708 if (len == 0)
709 return -1;
710
711 /* unquote */
712 if (val[0] == '"' || val[0] == '\'') {
713 if (val[len-1] != val[0]) {
714 log_debug("inconsistent quoting: '%s', skip\n", line);
715 return -1;
716 }
717 val[len-1] = '\0';
718 val++;
719 }
720
721 /* handle device, renamed by external tool, returning new path */
722 if (strcmp(key, "DEVPATH") == 0) {
723 char syspath[UTIL_PATH_SIZE];
724
725 log_debug("updating devpath from '%s' to '%s'\n",
726 udev_device_get_devpath(dev), val);
727 util_strscpyl(syspath, sizeof(syspath), udev_get_sys_path(udev), val, NULL);
728 udev_device_set_syspath(dev, syspath);
729 } else {
730 struct udev_list_entry *entry;
731
732 entry = udev_device_add_property(dev, key, val);
733 /* store in db, skip private keys */
734 if (key[0] != '.')
735 udev_list_entry_set_num(entry, true);
736 }
737 return 0;
738 }
739
740 static int import_file_into_properties(struct udev_device *dev, const char *filename)
741 {
742 FILE *f;
743 char line[UTIL_LINE_SIZE];
744
745 f = fopen(filename, "r");
746 if (f == NULL)
747 return -1;
748 while (fgets(line, sizeof(line), f) != NULL)
749 import_property_from_string(dev, line);
750 fclose(f);
751 return 0;
752 }
753
754 static int import_program_into_properties(struct udev_event *event, const char *program, const sigset_t *sigmask)
755 {
756 struct udev_device *dev = event->dev;
757 char **envp;
758 char result[UTIL_LINE_SIZE];
759 char *line;
760 int err;
761
762 envp = udev_device_get_properties_envp(dev);
763 err = udev_event_spawn(event, program, envp, sigmask, result, sizeof(result));
764 if (err < 0)
765 return err;
766
767 line = result;
768 while (line != NULL) {
769 char *pos;
770
771 pos = strchr(line, '\n');
772 if (pos != NULL) {
773 pos[0] = '\0';
774 pos = &pos[1];
775 }
776 import_property_from_string(dev, line);
777 line = pos;
778 }
779 return 0;
780 }
781
782 static int import_parent_into_properties(struct udev_device *dev, const char *filter)
783 {
784 struct udev_device *dev_parent;
785 struct udev_list_entry *list_entry;
786
787 dev_parent = udev_device_get_parent(dev);
788 if (dev_parent == NULL)
789 return -1;
790
791 udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(dev_parent)) {
792 const char *key = udev_list_entry_get_name(list_entry);
793 const char *val = udev_list_entry_get_value(list_entry);
794
795 if (fnmatch(filter, key, 0) == 0) {
796 struct udev_list_entry *entry;
797
798 entry = udev_device_add_property(dev, key, val);
799 /* store in db, skip private keys */
800 if (key[0] != '.')
801 udev_list_entry_set_num(entry, true);
802 }
803 }
804 return 0;
805 }
806
807 #define WAIT_LOOP_PER_SECOND 50
808 static int wait_for_file(struct udev_device *dev, const char *file, int timeout)
809 {
810 struct udev *udev = udev_device_get_udev(dev);
811 char filepath[UTIL_PATH_SIZE];
812 char devicepath[UTIL_PATH_SIZE];
813 struct stat stats;
814 int loop = timeout * WAIT_LOOP_PER_SECOND;
815
816 /* a relative path is a device attribute */
817 devicepath[0] = '\0';
818 if (file[0] != '/') {
819 util_strscpyl(devicepath, sizeof(devicepath),
820 udev_get_sys_path(udev), udev_device_get_devpath(dev), NULL);
821 util_strscpyl(filepath, sizeof(filepath), devicepath, "/", file, NULL);
822 file = filepath;
823 }
824
825 while (--loop) {
826 const struct timespec duration = { 0, 1000 * 1000 * 1000 / WAIT_LOOP_PER_SECOND };
827
828 /* lookup file */
829 if (stat(file, &stats) == 0) {
830 log_debug("file '%s' appeared after %i loops\n", file, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
831 return 0;
832 }
833 /* make sure, the device did not disappear in the meantime */
834 if (devicepath[0] != '\0' && stat(devicepath, &stats) != 0) {
835 log_debug("device disappeared while waiting for '%s'\n", file);
836 return -2;
837 }
838 log_debug("wait for '%s' for %i mseconds\n", file, 1000 / WAIT_LOOP_PER_SECOND);
839 nanosleep(&duration, NULL);
840 }
841 log_debug("waiting for '%s' failed\n", file);
842 return -1;
843 }
844
845 static int attr_subst_subdir(char *attr, size_t len)
846 {
847 bool found = false;
848
849 if (strstr(attr, "/*/")) {
850 char *pos;
851 char dirname[UTIL_PATH_SIZE];
852 const char *tail;
853 DIR *dir;
854
855 util_strscpy(dirname, sizeof(dirname), attr);
856 pos = strstr(dirname, "/*/");
857 if (pos == NULL)
858 return -1;
859 pos[0] = '\0';
860 tail = &pos[2];
861 dir = opendir(dirname);
862 if (dir != NULL) {
863 struct dirent *dent;
864
865 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
866 struct stat stats;
867
868 if (dent->d_name[0] == '.')
869 continue;
870 util_strscpyl(attr, len, dirname, "/", dent->d_name, tail, NULL);
871 if (stat(attr, &stats) == 0) {
872 found = true;
873 break;
874 }
875 }
876 closedir(dir);
877 }
878 }
879
880 return found;
881 }
882
883 static int get_key(struct udev *udev, char **line, char **key, enum operation_type *op, char **value)
884 {
885 char *linepos;
886 char *temp;
887
888 linepos = *line;
889 if (linepos == NULL || linepos[0] == '\0')
890 return -1;
891
892 /* skip whitespace */
893 while (isspace(linepos[0]) || linepos[0] == ',')
894 linepos++;
895
896 /* get the key */
897 if (linepos[0] == '\0')
898 return -1;
899 *key = linepos;
900
901 for (;;) {
902 linepos++;
903 if (linepos[0] == '\0')
904 return -1;
905 if (isspace(linepos[0]))
906 break;
907 if (linepos[0] == '=')
908 break;
909 if ((linepos[0] == '+') || (linepos[0] == '!') || (linepos[0] == ':'))
910 if (linepos[1] == '=')
911 break;
912 }
913
914 /* remember end of key */
915 temp = linepos;
916
917 /* skip whitespace after key */
918 while (isspace(linepos[0]))
919 linepos++;
920 if (linepos[0] == '\0')
921 return -1;
922
923 /* get operation type */
924 if (linepos[0] == '=' && linepos[1] == '=') {
925 *op = OP_MATCH;
926 linepos += 2;
927 } else if (linepos[0] == '!' && linepos[1] == '=') {
928 *op = OP_NOMATCH;
929 linepos += 2;
930 } else if (linepos[0] == '+' && linepos[1] == '=') {
931 *op = OP_ADD;
932 linepos += 2;
933 } else if (linepos[0] == '=') {
934 *op = OP_ASSIGN;
935 linepos++;
936 } else if (linepos[0] == ':' && linepos[1] == '=') {
937 *op = OP_ASSIGN_FINAL;
938 linepos += 2;
939 } else
940 return -1;
941
942 /* terminate key */
943 temp[0] = '\0';
944
945 /* skip whitespace after operator */
946 while (isspace(linepos[0]))
947 linepos++;
948 if (linepos[0] == '\0')
949 return -1;
950
951 /* get the value */
952 if (linepos[0] == '"')
953 linepos++;
954 else
955 return -1;
956 *value = linepos;
957
958 /* terminate */
959 temp = strchr(linepos, '"');
960 if (!temp)
961 return -1;
962 temp[0] = '\0';
963 temp++;
964
965 /* move line to next key */
966 *line = temp;
967 return 0;
968 }
969
970 /* extract possible KEY{attr} */
971 static const 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 log_error("missing closing brace for format\n");
982 return NULL;
983 }
984 pos[0] = '\0';
985 return attr;
986 }
987 return NULL;
988 }
989
990 static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
991 enum operation_type op,
992 const char *value, const void *data)
993 {
994 struct token *token = &rule_tmp->token[rule_tmp->token_cur];
995 const char *attr = NULL;
996
997 memset(token, 0x00, sizeof(struct token));
998
999 switch (type) {
1000 case TK_M_ACTION:
1001 case TK_M_DEVPATH:
1002 case TK_M_KERNEL:
1003 case TK_M_SUBSYSTEM:
1004 case TK_M_DRIVER:
1005 case TK_M_WAITFOR:
1006 case TK_M_DEVLINK:
1007 case TK_M_NAME:
1008 case TK_M_KERNELS:
1009 case TK_M_SUBSYSTEMS:
1010 case TK_M_DRIVERS:
1011 case TK_M_TAGS:
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_IMPORT_BUILTIN:
1029 token->key.value_off = add_string(rule_tmp->rules, value);
1030 token->key.builtin_cmd = *(enum udev_builtin_cmd *)data;
1031 break;
1032 case TK_M_ENV:
1033 case TK_M_ATTR:
1034 case TK_M_ATTRS:
1035 case TK_A_ATTR:
1036 case TK_A_ENV:
1037 attr = data;
1038 token->key.value_off = add_string(rule_tmp->rules, value);
1039 token->key.attr_off = add_string(rule_tmp->rules, attr);
1040 break;
1041 case TK_A_DEVLINK:
1042 token->key.value_off = add_string(rule_tmp->rules, value);
1043 token->key.devlink_unique = *(int *)data;
1044 break;
1045 case TK_M_TEST:
1046 token->key.value_off = add_string(rule_tmp->rules, value);
1047 if (data != NULL)
1048 token->key.mode = *(mode_t *)data;
1049 break;
1050 case TK_A_STRING_ESCAPE_NONE:
1051 case TK_A_STRING_ESCAPE_REPLACE:
1052 case TK_A_DB_PERSIST:
1053 break;
1054 case TK_A_RUN_BUILTIN:
1055 case TK_A_RUN_PROGRAM:
1056 token->key.builtin_cmd = *(enum udev_builtin_cmd *)data;
1057 token->key.value_off = add_string(rule_tmp->rules, value);
1058 break;
1059 case TK_A_INOTIFY_WATCH:
1060 case TK_A_DEVLINK_PRIO:
1061 token->key.devlink_prio = *(int *)data;
1062 break;
1063 case TK_A_OWNER_ID:
1064 token->key.uid = *(uid_t *)data;
1065 break;
1066 case TK_A_GROUP_ID:
1067 token->key.gid = *(gid_t *)data;
1068 break;
1069 case TK_A_MODE_ID:
1070 token->key.mode = *(mode_t *)data;
1071 break;
1072 case TK_A_STATIC_NODE:
1073 token->key.value_off = add_string(rule_tmp->rules, value);
1074 break;
1075 case TK_M_EVENT_TIMEOUT:
1076 token->key.event_timeout = *(int *)data;
1077 break;
1078 case TK_RULE:
1079 case TK_M_PARENTS_MIN:
1080 case TK_M_PARENTS_MAX:
1081 case TK_M_MAX:
1082 case TK_END:
1083 case TK_UNSET:
1084 log_error("wrong type %u\n", type);
1085 return -1;
1086 }
1087
1088 if (value != NULL && type < TK_M_MAX) {
1089 /* check if we need to split or call fnmatch() while matching rules */
1090 enum string_glob_type glob;
1091 int has_split;
1092 int has_glob;
1093
1094 has_split = (strchr(value, '|') != NULL);
1095 has_glob = (strchr(value, '*') != NULL || strchr(value, '?') != NULL || strchr(value, '[') != NULL);
1096 if (has_split && has_glob) {
1097 glob = GL_SPLIT_GLOB;
1098 } else if (has_split) {
1099 glob = GL_SPLIT;
1100 } else if (has_glob) {
1101 if (strcmp(value, "?*") == 0)
1102 glob = GL_SOMETHING;
1103 else
1104 glob = GL_GLOB;
1105 } else {
1106 glob = GL_PLAIN;
1107 }
1108 token->key.glob = glob;
1109 }
1110
1111 if (value != NULL && type > TK_M_MAX) {
1112 /* check if assigned value has substitution chars */
1113 if (value[0] == '[')
1114 token->key.subst = SB_SUBSYS;
1115 else if (strchr(value, '%') != NULL || strchr(value, '$') != NULL)
1116 token->key.subst = SB_FORMAT;
1117 else
1118 token->key.subst = SB_NONE;
1119 }
1120
1121 if (attr != NULL) {
1122 /* check if property/attribut name has substitution chars */
1123 if (attr[0] == '[')
1124 token->key.attrsubst = SB_SUBSYS;
1125 else if (strchr(attr, '%') != NULL || strchr(attr, '$') != NULL)
1126 token->key.attrsubst = SB_FORMAT;
1127 else
1128 token->key.attrsubst = SB_NONE;
1129 }
1130
1131 token->key.type = type;
1132 token->key.op = op;
1133 rule_tmp->token_cur++;
1134 if (rule_tmp->token_cur >= ARRAY_SIZE(rule_tmp->token)) {
1135 log_error("temporary rule array too small\n");
1136 return -1;
1137 }
1138 return 0;
1139 }
1140
1141 static int sort_token(struct udev_rules *rules, struct rule_tmp *rule_tmp)
1142 {
1143 unsigned int i;
1144 unsigned int start = 0;
1145 unsigned int end = rule_tmp->token_cur;
1146
1147 for (i = 0; i < rule_tmp->token_cur; i++) {
1148 enum token_type next_val = TK_UNSET;
1149 unsigned int next_idx = 0;
1150 unsigned int j;
1151
1152 /* find smallest value */
1153 for (j = start; j < end; j++) {
1154 if (rule_tmp->token[j].type == TK_UNSET)
1155 continue;
1156 if (next_val == TK_UNSET || rule_tmp->token[j].type < next_val) {
1157 next_val = rule_tmp->token[j].type;
1158 next_idx = j;
1159 }
1160 }
1161
1162 /* add token and mark done */
1163 if (add_token(rules, &rule_tmp->token[next_idx]) != 0)
1164 return -1;
1165 rule_tmp->token[next_idx].type = TK_UNSET;
1166
1167 /* shrink range */
1168 if (next_idx == start)
1169 start++;
1170 if (next_idx+1 == end)
1171 end--;
1172 }
1173 return 0;
1174 }
1175
1176 static int add_rule(struct udev_rules *rules, char *line,
1177 const char *filename, unsigned int filename_off, unsigned int lineno)
1178 {
1179 char *linepos;
1180 const char *attr;
1181 struct rule_tmp rule_tmp;
1182
1183 memset(&rule_tmp, 0x00, sizeof(struct rule_tmp));
1184 rule_tmp.rules = rules;
1185 rule_tmp.rule.type = TK_RULE;
1186 rule_tmp.rule.rule.filename_off = filename_off;
1187 rule_tmp.rule.rule.filename_line = lineno;
1188
1189 linepos = line;
1190 for (;;) {
1191 char *key;
1192 char *value;
1193 enum operation_type op;
1194
1195 if (get_key(rules->udev, &linepos, &key, &op, &value) != 0)
1196 break;
1197
1198 if (strcmp(key, "ACTION") == 0) {
1199 if (op > OP_MATCH_MAX) {
1200 log_error("invalid ACTION operation\n");
1201 goto invalid;
1202 }
1203 rule_add_key(&rule_tmp, TK_M_ACTION, op, value, NULL);
1204 continue;
1205 }
1206
1207 if (strcmp(key, "DEVPATH") == 0) {
1208 if (op > OP_MATCH_MAX) {
1209 log_error("invalid DEVPATH operation\n");
1210 goto invalid;
1211 }
1212 rule_add_key(&rule_tmp, TK_M_DEVPATH, op, value, NULL);
1213 continue;
1214 }
1215
1216 if (strcmp(key, "KERNEL") == 0) {
1217 if (op > OP_MATCH_MAX) {
1218 log_error("invalid KERNEL operation\n");
1219 goto invalid;
1220 }
1221 rule_add_key(&rule_tmp, TK_M_KERNEL, op, value, NULL);
1222 continue;
1223 }
1224
1225 if (strcmp(key, "SUBSYSTEM") == 0) {
1226 if (op > OP_MATCH_MAX) {
1227 log_error("invalid SUBSYSTEM operation\n");
1228 goto invalid;
1229 }
1230 /* bus, class, subsystem events should all be the same */
1231 if (strcmp(value, "subsystem") == 0 ||
1232 strcmp(value, "bus") == 0 ||
1233 strcmp(value, "class") == 0) {
1234 if (strcmp(value, "bus") == 0 || strcmp(value, "class") == 0)
1235 log_error("'%s' must be specified as 'subsystem' \n"
1236 "please fix it in %s:%u", value, filename, lineno);
1237 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, "subsystem|class|bus", NULL);
1238 } else
1239 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, value, NULL);
1240 continue;
1241 }
1242
1243 if (strcmp(key, "DRIVER") == 0) {
1244 if (op > OP_MATCH_MAX) {
1245 log_error("invalid DRIVER operation\n");
1246 goto invalid;
1247 }
1248 rule_add_key(&rule_tmp, TK_M_DRIVER, op, value, NULL);
1249 continue;
1250 }
1251
1252 if (strncmp(key, "ATTR{", sizeof("ATTR{")-1) == 0) {
1253 attr = get_key_attribute(rules->udev, key + sizeof("ATTR")-1);
1254 if (attr == NULL) {
1255 log_error("error parsing ATTR attribute\n");
1256 goto invalid;
1257 }
1258 if (op < OP_MATCH_MAX) {
1259 rule_add_key(&rule_tmp, TK_M_ATTR, op, value, attr);
1260 } else {
1261 rule_add_key(&rule_tmp, TK_A_ATTR, op, value, attr);
1262 }
1263 continue;
1264 }
1265
1266 if (strcmp(key, "KERNELS") == 0) {
1267 if (op > OP_MATCH_MAX) {
1268 log_error("invalid KERNELS operation\n");
1269 goto invalid;
1270 }
1271 rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1272 continue;
1273 }
1274
1275 if (strcmp(key, "SUBSYSTEMS") == 0) {
1276 if (op > OP_MATCH_MAX) {
1277 log_error("invalid SUBSYSTEMS operation\n");
1278 goto invalid;
1279 }
1280 rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1281 continue;
1282 }
1283
1284 if (strcmp(key, "DRIVERS") == 0) {
1285 if (op > OP_MATCH_MAX) {
1286 log_error("invalid DRIVERS operation\n");
1287 goto invalid;
1288 }
1289 rule_add_key(&rule_tmp, TK_M_DRIVERS, op, value, NULL);
1290 continue;
1291 }
1292
1293 if (strncmp(key, "ATTRS{", sizeof("ATTRS{")-1) == 0) {
1294 if (op > OP_MATCH_MAX) {
1295 log_error("invalid ATTRS operation\n");
1296 goto invalid;
1297 }
1298 attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);
1299 if (attr == NULL) {
1300 log_error("error parsing ATTRS attribute\n");
1301 goto invalid;
1302 }
1303 if (strncmp(attr, "device/", 7) == 0)
1304 log_error("the 'device' link may not be available in a future kernel, "
1305 "please fix it in %s:%u", filename, lineno);
1306 else if (strstr(attr, "../") != NULL)
1307 log_error("do not reference parent sysfs directories directly, "
1308 "it may break with a future kernel, please fix it in %s:%u", filename, lineno);
1309 rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1310 continue;
1311 }
1312
1313 if (strcmp(key, "TAGS") == 0) {
1314 if (op > OP_MATCH_MAX) {
1315 log_error("invalid TAGS operation\n");
1316 goto invalid;
1317 }
1318 rule_add_key(&rule_tmp, TK_M_TAGS, op, value, NULL);
1319 continue;
1320 }
1321
1322 if (strncmp(key, "ENV{", sizeof("ENV{")-1) == 0) {
1323 attr = get_key_attribute(rules->udev, key + sizeof("ENV")-1);
1324 if (attr == NULL) {
1325 log_error("error parsing ENV attribute\n");
1326 goto invalid;
1327 }
1328 if (op < OP_MATCH_MAX) {
1329 if (rule_add_key(&rule_tmp, TK_M_ENV, op, value, attr) != 0)
1330 goto invalid;
1331 } else {
1332 static const char *blacklist[] = {
1333 "ACTION",
1334 "SUBSYSTEM",
1335 "DEVTYPE",
1336 "MAJOR",
1337 "MINOR",
1338 "DRIVER",
1339 "IFINDEX",
1340 "DEVNAME",
1341 "DEVLINKS",
1342 "DEVPATH",
1343 "TAGS",
1344 };
1345 unsigned int i;
1346
1347 for (i = 0; i < ARRAY_SIZE(blacklist); i++)
1348 if (strcmp(attr, blacklist[i]) == 0) {
1349 log_error("invalid ENV attribute, '%s' can not be set %s:%u\n", attr, filename, lineno);
1350 continue;
1351 }
1352 if (rule_add_key(&rule_tmp, TK_A_ENV, op, value, attr) != 0)
1353 goto invalid;
1354 }
1355 continue;
1356 }
1357
1358 if (strcmp(key, "TAG") == 0) {
1359 if (op < OP_MATCH_MAX)
1360 rule_add_key(&rule_tmp, TK_M_TAG, op, value, NULL);
1361 else
1362 rule_add_key(&rule_tmp, TK_A_TAG, op, value, NULL);
1363 continue;
1364 }
1365
1366 if (strcmp(key, "PROGRAM") == 0) {
1367 rule_add_key(&rule_tmp, TK_M_PROGRAM, op, value, NULL);
1368 continue;
1369 }
1370
1371 if (strcmp(key, "RESULT") == 0) {
1372 if (op > OP_MATCH_MAX) {
1373 log_error("invalid RESULT operation\n");
1374 goto invalid;
1375 }
1376 rule_add_key(&rule_tmp, TK_M_RESULT, op, value, NULL);
1377 continue;
1378 }
1379
1380 if (strncmp(key, "IMPORT", sizeof("IMPORT")-1) == 0) {
1381 attr = get_key_attribute(rules->udev, key + sizeof("IMPORT")-1);
1382 if (attr == NULL) {
1383 log_error("IMPORT{} type missing, ignoring IMPORT %s:%u\n", filename, lineno);
1384 continue;
1385 }
1386 if (strcmp(attr, "program") == 0) {
1387 /* find known built-in command */
1388 if (value[0] != '/') {
1389 enum udev_builtin_cmd cmd;
1390
1391 cmd = udev_builtin_lookup(value);
1392 if (cmd < UDEV_BUILTIN_MAX) {
1393 log_debug("IMPORT found builtin '%s', replacing %s:%u\n",
1394 value, filename, lineno);
1395 rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, value, &cmd);
1396 continue;
1397 }
1398 }
1399 rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1400 } else if (strcmp(attr, "builtin") == 0) {
1401 enum udev_builtin_cmd cmd = udev_builtin_lookup(value);
1402
1403 if (cmd < UDEV_BUILTIN_MAX)
1404 rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, value, &cmd);
1405 else
1406 log_error("IMPORT{builtin}: '%s' unknown %s:%u\n", value, filename, lineno);
1407 } else if (strcmp(attr, "file") == 0) {
1408 rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1409 } else if (strcmp(attr, "db") == 0) {
1410 rule_add_key(&rule_tmp, TK_M_IMPORT_DB, op, value, NULL);
1411 } else if (strcmp(attr, "cmdline") == 0) {
1412 rule_add_key(&rule_tmp, TK_M_IMPORT_CMDLINE, op, value, NULL);
1413 } else if (strcmp(attr, "parent") == 0) {
1414 rule_add_key(&rule_tmp, TK_M_IMPORT_PARENT, op, value, NULL);
1415 } else
1416 log_error("IMPORT{} unknown type, ignoring IMPORT %s:%u\n", filename, lineno);
1417 continue;
1418 }
1419
1420 if (strncmp(key, "TEST", sizeof("TEST")-1) == 0) {
1421 mode_t mode = 0;
1422
1423 if (op > OP_MATCH_MAX) {
1424 log_error("invalid TEST operation\n");
1425 goto invalid;
1426 }
1427 attr = get_key_attribute(rules->udev, key + sizeof("TEST")-1);
1428 if (attr != NULL) {
1429 mode = strtol(attr, NULL, 8);
1430 rule_add_key(&rule_tmp, TK_M_TEST, op, value, &mode);
1431 } else {
1432 rule_add_key(&rule_tmp, TK_M_TEST, op, value, NULL);
1433 }
1434 continue;
1435 }
1436
1437 if (strncmp(key, "RUN", sizeof("RUN")-1) == 0) {
1438 attr = get_key_attribute(rules->udev, key + sizeof("RUN")-1);
1439 if (attr == NULL)
1440 attr = "program";
1441
1442 if (strcmp(attr, "builtin") == 0) {
1443 enum udev_builtin_cmd cmd = udev_builtin_lookup(value);
1444
1445 if (cmd < UDEV_BUILTIN_MAX)
1446 rule_add_key(&rule_tmp, TK_A_RUN_BUILTIN, op, value, &cmd);
1447 else
1448 log_error("IMPORT{builtin}: '%s' unknown %s:%u\n", value, filename, lineno);
1449 } else if (strcmp(attr, "program") == 0) {
1450 enum udev_builtin_cmd cmd = UDEV_BUILTIN_MAX;
1451
1452 rule_add_key(&rule_tmp, TK_A_RUN_PROGRAM, op, value, &cmd);
1453 } else {
1454 log_error("RUN{} unknown type, ignoring RUN %s:%u\n", filename, lineno);
1455 }
1456
1457 continue;
1458 }
1459
1460 if (strcmp(key, "WAIT_FOR") == 0 || strcmp(key, "WAIT_FOR_SYSFS") == 0) {
1461 rule_add_key(&rule_tmp, TK_M_WAITFOR, 0, value, NULL);
1462 continue;
1463 }
1464
1465 if (strcmp(key, "LABEL") == 0) {
1466 rule_tmp.rule.rule.label_off = add_string(rules, value);
1467 continue;
1468 }
1469
1470 if (strcmp(key, "GOTO") == 0) {
1471 rule_add_key(&rule_tmp, TK_A_GOTO, 0, value, NULL);
1472 continue;
1473 }
1474
1475 if (strncmp(key, "NAME", sizeof("NAME")-1) == 0) {
1476 if (op < OP_MATCH_MAX) {
1477 rule_add_key(&rule_tmp, TK_M_NAME, op, value, NULL);
1478 } else {
1479 if (strcmp(value, "%k") == 0) {
1480 log_error("NAME=\"%%k\" is ignored, because it breaks kernel supplied names, "
1481 "please remove it from %s:%u\n", filename, lineno);
1482 continue;
1483 }
1484 if (value[0] == '\0') {
1485 log_debug("NAME=\"\" is ignored, because udev will not delete any device nodes, "
1486 "please remove it from %s:%u\n", filename, lineno);
1487 continue;
1488 }
1489 rule_add_key(&rule_tmp, TK_A_NAME, op, value, NULL);
1490 }
1491 rule_tmp.rule.rule.can_set_name = true;
1492 continue;
1493 }
1494
1495 if (strncmp(key, "SYMLINK", sizeof("SYMLINK")-1) == 0) {
1496 if (op < OP_MATCH_MAX) {
1497 rule_add_key(&rule_tmp, TK_M_DEVLINK, op, value, NULL);
1498 } else {
1499 int flag = 0;
1500
1501 attr = get_key_attribute(rules->udev, key + sizeof("SYMLINK")-1);
1502 if (attr != NULL && strstr(attr, "unique") != NULL)
1503 flag = 1;
1504 rule_add_key(&rule_tmp, TK_A_DEVLINK, op, value, &flag);
1505 }
1506 rule_tmp.rule.rule.can_set_name = true;
1507 continue;
1508 }
1509
1510 if (strcmp(key, "OWNER") == 0) {
1511 uid_t uid;
1512 char *endptr;
1513
1514 uid = strtoul(value, &endptr, 10);
1515 if (endptr[0] == '\0') {
1516 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1517 } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1518 uid = add_uid(rules, value);
1519 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1520 } else if (rules->resolve_names >= 0) {
1521 rule_add_key(&rule_tmp, TK_A_OWNER, op, value, NULL);
1522 }
1523 rule_tmp.rule.rule.can_set_name = true;
1524 continue;
1525 }
1526
1527 if (strcmp(key, "GROUP") == 0) {
1528 gid_t gid;
1529 char *endptr;
1530
1531 gid = strtoul(value, &endptr, 10);
1532 if (endptr[0] == '\0') {
1533 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1534 } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1535 gid = add_gid(rules, value);
1536 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1537 } else if (rules->resolve_names >= 0) {
1538 rule_add_key(&rule_tmp, TK_A_GROUP, op, value, NULL);
1539 }
1540 rule_tmp.rule.rule.can_set_name = true;
1541 continue;
1542 }
1543
1544 if (strcmp(key, "MODE") == 0) {
1545 mode_t mode;
1546 char *endptr;
1547
1548 mode = strtol(value, &endptr, 8);
1549 if (endptr[0] == '\0')
1550 rule_add_key(&rule_tmp, TK_A_MODE_ID, op, NULL, &mode);
1551 else
1552 rule_add_key(&rule_tmp, TK_A_MODE, op, value, NULL);
1553 rule_tmp.rule.rule.can_set_name = true;
1554 continue;
1555 }
1556
1557 if (strcmp(key, "OPTIONS") == 0) {
1558 const char *pos;
1559
1560 pos = strstr(value, "link_priority=");
1561 if (pos != NULL) {
1562 int prio = atoi(&pos[strlen("link_priority=")]);
1563
1564 rule_add_key(&rule_tmp, TK_A_DEVLINK_PRIO, op, NULL, &prio);
1565 }
1566
1567 pos = strstr(value, "event_timeout=");
1568 if (pos != NULL) {
1569 int tout = atoi(&pos[strlen("event_timeout=")]);
1570
1571 rule_add_key(&rule_tmp, TK_M_EVENT_TIMEOUT, op, NULL, &tout);
1572 }
1573
1574 pos = strstr(value, "string_escape=");
1575 if (pos != NULL) {
1576 pos = &pos[strlen("string_escape=")];
1577 if (strncmp(pos, "none", strlen("none")) == 0)
1578 rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_NONE, op, NULL, NULL);
1579 else if (strncmp(pos, "replace", strlen("replace")) == 0)
1580 rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_REPLACE, op, NULL, NULL);
1581 }
1582
1583 pos = strstr(value, "db_persist");
1584 if (pos != NULL)
1585 rule_add_key(&rule_tmp, TK_A_DB_PERSIST, op, NULL, NULL);
1586
1587 pos = strstr(value, "nowatch");
1588 if (pos != NULL) {
1589 const int off = 0;
1590
1591 rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &off);
1592 } else {
1593 pos = strstr(value, "watch");
1594 if (pos != NULL) {
1595 const int on = 1;
1596
1597 rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &on);
1598 }
1599 }
1600
1601 pos = strstr(value, "static_node=");
1602 if (pos != NULL) {
1603 rule_add_key(&rule_tmp, TK_A_STATIC_NODE, op, &pos[strlen("static_node=")], NULL);
1604 rule_tmp.rule.rule.has_static_node = true;
1605 }
1606
1607 continue;
1608 }
1609
1610 log_error("unknown key '%s' in %s:%u\n", key, filename, lineno);
1611 goto invalid;
1612 }
1613
1614 /* add rule token */
1615 rule_tmp.rule.rule.token_count = 1 + rule_tmp.token_cur;
1616 if (add_token(rules, &rule_tmp.rule) != 0)
1617 goto invalid;
1618
1619 /* add tokens to list, sorted by type */
1620 if (sort_token(rules, &rule_tmp) != 0)
1621 goto invalid;
1622
1623 return 0;
1624 invalid:
1625 log_error("invalid rule '%s:%u'\n", filename, lineno);
1626 return -1;
1627 }
1628
1629 static int parse_file(struct udev_rules *rules, const char *filename, unsigned short filename_off)
1630 {
1631 FILE *f;
1632 unsigned int first_token;
1633 char line[UTIL_LINE_SIZE];
1634 int line_nr = 0;
1635 unsigned int i;
1636
1637 log_debug("reading '%s' as rules file\n", filename);
1638
1639 f = fopen(filename, "r");
1640 if (f == NULL)
1641 return -1;
1642
1643 first_token = rules->token_cur;
1644
1645 while (fgets(line, sizeof(line), f) != NULL) {
1646 char *key;
1647 size_t len;
1648
1649 /* skip whitespace */
1650 line_nr++;
1651 key = line;
1652 while (isspace(key[0]))
1653 key++;
1654
1655 /* comment */
1656 if (key[0] == '#')
1657 continue;
1658
1659 len = strlen(line);
1660 if (len < 3)
1661 continue;
1662
1663 /* continue reading if backslash+newline is found */
1664 while (line[len-2] == '\\') {
1665 if (fgets(&line[len-2], (sizeof(line)-len)+2, f) == NULL)
1666 break;
1667 if (strlen(&line[len-2]) < 2)
1668 break;
1669 line_nr++;
1670 len = strlen(line);
1671 }
1672
1673 if (len+1 >= sizeof(line)) {
1674 log_error("line too long '%s':%u, ignored\n", filename, line_nr);
1675 continue;
1676 }
1677 add_rule(rules, key, filename, filename_off, line_nr);
1678 }
1679 fclose(f);
1680
1681 /* link GOTOs to LABEL rules in this file to be able to fast-forward */
1682 for (i = first_token+1; i < rules->token_cur; i++) {
1683 if (rules->tokens[i].type == TK_A_GOTO) {
1684 char *label = &rules->buf[rules->tokens[i].key.value_off];
1685 unsigned int j;
1686
1687 for (j = i+1; j < rules->token_cur; j++) {
1688 if (rules->tokens[j].type != TK_RULE)
1689 continue;
1690 if (rules->tokens[j].rule.label_off == 0)
1691 continue;
1692 if (strcmp(label, &rules->buf[rules->tokens[j].rule.label_off]) != 0)
1693 continue;
1694 rules->tokens[i].key.rule_goto = j;
1695 break;
1696 }
1697 if (rules->tokens[i].key.rule_goto == 0)
1698 log_error("GOTO '%s' has no matching label in: '%s'\n", label, filename);
1699 }
1700 }
1701 return 0;
1702 }
1703
1704 static int add_matching_files(struct udev *udev, struct udev_list *file_list, const char *dirname, const char *suffix)
1705 {
1706 DIR *dir;
1707 struct dirent *dent;
1708 char filename[UTIL_PATH_SIZE];
1709
1710 dir = opendir(dirname);
1711 if (dir == NULL) {
1712 log_debug("unable to open '%s': %m\n", dirname);
1713 return -1;
1714 }
1715
1716 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
1717 if (dent->d_name[0] == '.')
1718 continue;
1719
1720 /* look for file matching with specified suffix */
1721 if (suffix != NULL) {
1722 const char *ext;
1723
1724 ext = strrchr(dent->d_name, '.');
1725 if (ext == NULL)
1726 continue;
1727 if (strcmp(ext, suffix) != 0)
1728 continue;
1729 }
1730 util_strscpyl(filename, sizeof(filename), dirname, "/", dent->d_name, NULL);
1731 /*
1732 * the basename is the key, the filename the value
1733 * identical basenames from different directories override each other
1734 * entries are sorted after basename
1735 */
1736 udev_list_entry_add(file_list, dent->d_name, filename);
1737 }
1738
1739 closedir(dir);
1740 return 0;
1741 }
1742
1743 struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
1744 {
1745 struct udev_rules *rules;
1746 struct udev_list file_list;
1747 struct udev_list_entry *file_loop;
1748 struct token end_token;
1749 char **s;
1750
1751 rules = calloc(1, sizeof(struct udev_rules));
1752 if (rules == NULL)
1753 return NULL;
1754 rules->udev = udev;
1755 rules->resolve_names = resolve_names;
1756 udev_list_init(udev, &file_list, true);
1757
1758 /* init token array and string buffer */
1759 rules->tokens = malloc(PREALLOC_TOKEN * sizeof(struct token));
1760 if (rules->tokens == NULL) {
1761 free(rules);
1762 return NULL;
1763 }
1764 rules->token_max = PREALLOC_TOKEN;
1765
1766 rules->buf = malloc(PREALLOC_STRBUF);
1767 if (rules->buf == NULL) {
1768 free(rules->tokens);
1769 free(rules);
1770 return NULL;
1771 }
1772 rules->buf_max = PREALLOC_STRBUF;
1773 /* offset 0 is always '\0' */
1774 rules->buf[0] = '\0';
1775 rules->buf_cur = 1;
1776
1777 rules->trie_nodes = malloc(PREALLOC_TRIE * sizeof(struct trie_node));
1778 if (rules->trie_nodes == NULL) {
1779 free(rules->buf);
1780 free(rules->tokens);
1781 free(rules);
1782 return NULL;
1783 }
1784 rules->trie_nodes_max = PREALLOC_TRIE;
1785 /* offset 0 is the trie root, with an empty string */
1786 memset(rules->trie_nodes, 0x00, sizeof(struct trie_node));
1787 rules->trie_nodes_cur = 1;
1788
1789 for (udev_get_rules_path(udev, &s, NULL); *s != NULL; s++)
1790 add_matching_files(udev, &file_list, *s, ".rules");
1791
1792 /* add all filenames to the string buffer */
1793 udev_list_entry_foreach(file_loop, udev_list_get_entry(&file_list)) {
1794 const char *filename = udev_list_entry_get_value(file_loop);
1795 unsigned int filename_off;
1796
1797 filename_off = add_string(rules, filename);
1798 /* the offset in the rule is limited to unsigned short */
1799 if (filename_off < USHRT_MAX)
1800 udev_list_entry_set_num(file_loop, filename_off);
1801 }
1802
1803 /* parse all rules files */
1804 udev_list_entry_foreach(file_loop, udev_list_get_entry(&file_list)) {
1805 const char *filename = udev_list_entry_get_value(file_loop);
1806 unsigned int filename_off = udev_list_entry_get_num(file_loop);
1807 struct stat st;
1808
1809 if (stat(filename, &st) != 0) {
1810 log_error("can not find '%s': %m\n", filename);
1811 continue;
1812 }
1813 if (S_ISREG(st.st_mode) && st.st_size <= 0) {
1814 log_debug("ignore empty '%s'\n", filename);
1815 continue;
1816 }
1817 if (S_ISCHR(st.st_mode)) {
1818 log_debug("ignore masked '%s'\n", filename);
1819 continue;
1820 }
1821 parse_file(rules, filename, filename_off);
1822 }
1823 udev_list_cleanup(&file_list);
1824
1825 memset(&end_token, 0x00, sizeof(struct token));
1826 end_token.type = TK_END;
1827 add_token(rules, &end_token);
1828
1829 /* shrink allocated token and string buffer */
1830 if (rules->token_cur < rules->token_max) {
1831 struct token *tokens;
1832
1833 tokens = realloc(rules->tokens, rules->token_cur * sizeof(struct token));
1834 if (tokens != NULL || rules->token_cur == 0) {
1835 rules->tokens = tokens;
1836 rules->token_max = rules->token_cur;
1837 }
1838 }
1839 if (rules->buf_cur < rules->buf_max) {
1840 char *buf;
1841
1842 buf = realloc(rules->buf, rules->buf_cur);
1843 if (buf != NULL || rules->buf_cur == 0) {
1844 rules->buf = buf;
1845 rules->buf_max = rules->buf_cur;
1846 }
1847 }
1848 log_debug("rules use %zu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
1849 rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
1850 log_debug("temporary index used %zu bytes (%u * %zu bytes)\n",
1851 rules->trie_nodes_cur * sizeof(struct trie_node),
1852 rules->trie_nodes_cur, sizeof(struct trie_node));
1853
1854 /* cleanup trie */
1855 free(rules->trie_nodes);
1856 rules->trie_nodes = NULL;
1857 rules->trie_nodes_cur = 0;
1858 rules->trie_nodes_max = 0;
1859
1860 /* cleanup uid/gid cache */
1861 free(rules->uids);
1862 rules->uids = NULL;
1863 rules->uids_cur = 0;
1864 rules->uids_max = 0;
1865 free(rules->gids);
1866 rules->gids = NULL;
1867 rules->gids_cur = 0;
1868 rules->gids_max = 0;
1869
1870 dump_rules(rules);
1871 return rules;
1872 }
1873
1874 struct udev_rules *udev_rules_unref(struct udev_rules *rules)
1875 {
1876 if (rules == NULL)
1877 return NULL;
1878 free(rules->tokens);
1879 free(rules->buf);
1880 free(rules->trie_nodes);
1881 free(rules->uids);
1882 free(rules->gids);
1883 free(rules);
1884 return NULL;
1885 }
1886
1887 static int match_key(struct udev_rules *rules, struct token *token, const char *val)
1888 {
1889 char *key_value = &rules->buf[token->key.value_off];
1890 char *pos;
1891 bool match = false;
1892
1893 if (val == NULL)
1894 val = "";
1895
1896 switch (token->key.glob) {
1897 case GL_PLAIN:
1898 match = (strcmp(key_value, val) == 0);
1899 break;
1900 case GL_GLOB:
1901 match = (fnmatch(key_value, val, 0) == 0);
1902 break;
1903 case GL_SPLIT:
1904 {
1905 const char *split;
1906 size_t len;
1907
1908 split = &rules->buf[token->key.value_off];
1909 len = strlen(val);
1910 for (;;) {
1911 const char *next;
1912
1913 next = strchr(split, '|');
1914 if (next != NULL) {
1915 size_t matchlen = (size_t)(next - split);
1916
1917 match = (matchlen == len && strncmp(split, val, matchlen) == 0);
1918 if (match)
1919 break;
1920 } else {
1921 match = (strcmp(split, val) == 0);
1922 break;
1923 }
1924 split = &next[1];
1925 }
1926 break;
1927 }
1928 case GL_SPLIT_GLOB:
1929 {
1930 char value[UTIL_PATH_SIZE];
1931
1932 util_strscpy(value, sizeof(value), &rules->buf[token->key.value_off]);
1933 key_value = value;
1934 while (key_value != NULL) {
1935 pos = strchr(key_value, '|');
1936 if (pos != NULL) {
1937 pos[0] = '\0';
1938 pos = &pos[1];
1939 }
1940 match = (fnmatch(key_value, val, 0) == 0);
1941 if (match)
1942 break;
1943 key_value = pos;
1944 }
1945 break;
1946 }
1947 case GL_SOMETHING:
1948 match = (val[0] != '\0');
1949 break;
1950 case GL_UNSET:
1951 return -1;
1952 }
1953
1954 if (match && (token->key.op == OP_MATCH))
1955 return 0;
1956 if (!match && (token->key.op == OP_NOMATCH))
1957 return 0;
1958 return -1;
1959 }
1960
1961 static int match_attr(struct udev_rules *rules, struct udev_device *dev, struct udev_event *event, struct token *cur)
1962 {
1963 const char *name;
1964 char nbuf[UTIL_NAME_SIZE];
1965 const char *value;
1966 char vbuf[UTIL_NAME_SIZE];
1967 size_t len;
1968
1969 name = &rules->buf[cur->key.attr_off];
1970 switch (cur->key.attrsubst) {
1971 case SB_FORMAT:
1972 udev_event_apply_format(event, name, nbuf, sizeof(nbuf));
1973 name = nbuf;
1974 /* fall through */
1975 case SB_NONE:
1976 value = udev_device_get_sysattr_value(dev, name);
1977 if (value == NULL)
1978 return -1;
1979 break;
1980 case SB_SUBSYS:
1981 if (util_resolve_subsys_kernel(event->udev, name, vbuf, sizeof(vbuf), 1) != 0)
1982 return -1;
1983 value = vbuf;
1984 break;
1985 default:
1986 return -1;
1987 }
1988
1989 /* remove trailing whitespace, if not asked to match for it */
1990 len = strlen(value);
1991 if (len > 0 && isspace(value[len-1])) {
1992 const char *key_value;
1993 size_t klen;
1994
1995 key_value = &rules->buf[cur->key.value_off];
1996 klen = strlen(key_value);
1997 if (klen > 0 && !isspace(key_value[klen-1])) {
1998 if (value != vbuf) {
1999 util_strscpy(vbuf, sizeof(vbuf), value);
2000 value = vbuf;
2001 }
2002 while (len > 0 && isspace(vbuf[--len]))
2003 vbuf[len] = '\0';
2004 }
2005 }
2006
2007 return match_key(rules, cur, value);
2008 }
2009
2010 enum escape_type {
2011 ESCAPE_UNSET,
2012 ESCAPE_NONE,
2013 ESCAPE_REPLACE,
2014 };
2015
2016 int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event, const sigset_t *sigmask)
2017 {
2018 struct token *cur;
2019 struct token *rule;
2020 enum escape_type esc = ESCAPE_UNSET;
2021 bool can_set_name;
2022
2023 if (rules->tokens == NULL)
2024 return -1;
2025
2026 can_set_name = ((strcmp(udev_device_get_action(event->dev), "remove") != 0) &&
2027 (major(udev_device_get_devnum(event->dev)) > 0 ||
2028 udev_device_get_ifindex(event->dev) > 0));
2029
2030 /* loop through token list, match, run actions or forward to next rule */
2031 cur = &rules->tokens[0];
2032 rule = cur;
2033 for (;;) {
2034 dump_token(rules, cur);
2035 switch (cur->type) {
2036 case TK_RULE:
2037 /* current rule */
2038 rule = cur;
2039 /* possibly skip rules which want to set NAME, SYMLINK, OWNER, GROUP, MODE */
2040 if (!can_set_name && rule->rule.can_set_name)
2041 goto nomatch;
2042 esc = ESCAPE_UNSET;
2043 break;
2044 case TK_M_ACTION:
2045 if (match_key(rules, cur, udev_device_get_action(event->dev)) != 0)
2046 goto nomatch;
2047 break;
2048 case TK_M_DEVPATH:
2049 if (match_key(rules, cur, udev_device_get_devpath(event->dev)) != 0)
2050 goto nomatch;
2051 break;
2052 case TK_M_KERNEL:
2053 if (match_key(rules, cur, udev_device_get_sysname(event->dev)) != 0)
2054 goto nomatch;
2055 break;
2056 case TK_M_DEVLINK: {
2057 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
2058 struct udev_list_entry *list_entry;
2059 bool match = false;
2060
2061 udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(event->dev)) {
2062 const char *devlink;
2063
2064 devlink = &udev_list_entry_get_name(list_entry)[devlen];
2065 if (match_key(rules, cur, devlink) == 0) {
2066 match = true;
2067 break;
2068 }
2069 }
2070 if (!match)
2071 goto nomatch;
2072 break;
2073 }
2074 case TK_M_NAME:
2075 if (match_key(rules, cur, event->name) != 0)
2076 goto nomatch;
2077 break;
2078 case TK_M_ENV: {
2079 const char *key_name = &rules->buf[cur->key.attr_off];
2080 const char *value;
2081
2082 value = udev_device_get_property_value(event->dev, key_name);
2083 if (value == NULL)
2084 value = "";
2085 if (match_key(rules, cur, value))
2086 goto nomatch;
2087 break;
2088 }
2089 case TK_M_TAG: {
2090 struct udev_list_entry *list_entry;
2091 bool match = false;
2092
2093 udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(event->dev)) {
2094 if (strcmp(&rules->buf[cur->key.value_off], udev_list_entry_get_name(list_entry)) == 0) {
2095 match = true;
2096 break;
2097 }
2098 }
2099 if (!match && (cur->key.op != OP_NOMATCH))
2100 goto nomatch;
2101 break;
2102 }
2103 case TK_M_SUBSYSTEM:
2104 if (match_key(rules, cur, udev_device_get_subsystem(event->dev)) != 0)
2105 goto nomatch;
2106 break;
2107 case TK_M_DRIVER:
2108 if (match_key(rules, cur, udev_device_get_driver(event->dev)) != 0)
2109 goto nomatch;
2110 break;
2111 case TK_M_WAITFOR: {
2112 char filename[UTIL_PATH_SIZE];
2113 int found;
2114
2115 udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2116 found = (wait_for_file(event->dev, filename, 10) == 0);
2117 if (!found && (cur->key.op != OP_NOMATCH))
2118 goto nomatch;
2119 break;
2120 }
2121 case TK_M_ATTR:
2122 if (match_attr(rules, event->dev, event, cur) != 0)
2123 goto nomatch;
2124 break;
2125 case TK_M_KERNELS:
2126 case TK_M_SUBSYSTEMS:
2127 case TK_M_DRIVERS:
2128 case TK_M_ATTRS:
2129 case TK_M_TAGS: {
2130 struct token *next;
2131
2132 /* get whole sequence of parent matches */
2133 next = cur;
2134 while (next->type > TK_M_PARENTS_MIN && next->type < TK_M_PARENTS_MAX)
2135 next++;
2136
2137 /* loop over parents */
2138 event->dev_parent = event->dev;
2139 for (;;) {
2140 struct token *key;
2141
2142 /* loop over sequence of parent match keys */
2143 for (key = cur; key < next; key++ ) {
2144 dump_token(rules, key);
2145 switch(key->type) {
2146 case TK_M_KERNELS:
2147 if (match_key(rules, key, udev_device_get_sysname(event->dev_parent)) != 0)
2148 goto try_parent;
2149 break;
2150 case TK_M_SUBSYSTEMS:
2151 if (match_key(rules, key, udev_device_get_subsystem(event->dev_parent)) != 0)
2152 goto try_parent;
2153 break;
2154 case TK_M_DRIVERS:
2155 if (match_key(rules, key, udev_device_get_driver(event->dev_parent)) != 0)
2156 goto try_parent;
2157 break;
2158 case TK_M_ATTRS:
2159 if (match_attr(rules, event->dev_parent, event, key) != 0)
2160 goto try_parent;
2161 break;
2162 case TK_M_TAGS: {
2163 bool match = udev_device_has_tag(event->dev_parent, &rules->buf[cur->key.value_off]);
2164
2165 if (match && key->key.op == OP_NOMATCH)
2166 goto try_parent;
2167 if (!match && key->key.op == OP_MATCH)
2168 goto try_parent;
2169 break;
2170 }
2171 default:
2172 goto nomatch;
2173 }
2174 }
2175 break;
2176
2177 try_parent:
2178 event->dev_parent = udev_device_get_parent(event->dev_parent);
2179 if (event->dev_parent == NULL)
2180 goto nomatch;
2181 }
2182 /* move behind our sequence of parent match keys */
2183 cur = next;
2184 continue;
2185 }
2186 case TK_M_TEST: {
2187 char filename[UTIL_PATH_SIZE];
2188 struct stat statbuf;
2189 int match;
2190
2191 udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2192 if (util_resolve_subsys_kernel(event->udev, filename, filename, sizeof(filename), 0) != 0) {
2193 if (filename[0] != '/') {
2194 char tmp[UTIL_PATH_SIZE];
2195
2196 util_strscpy(tmp, sizeof(tmp), filename);
2197 util_strscpyl(filename, sizeof(filename),
2198 udev_device_get_syspath(event->dev), "/", tmp, NULL);
2199 }
2200 }
2201 attr_subst_subdir(filename, sizeof(filename));
2202
2203 match = (stat(filename, &statbuf) == 0);
2204 if (match && cur->key.mode > 0)
2205 match = ((statbuf.st_mode & cur->key.mode) > 0);
2206 if (match && cur->key.op == OP_NOMATCH)
2207 goto nomatch;
2208 if (!match && cur->key.op == OP_MATCH)
2209 goto nomatch;
2210 break;
2211 }
2212 case TK_M_EVENT_TIMEOUT:
2213 log_debug("OPTIONS event_timeout=%u\n", cur->key.event_timeout);
2214 event->timeout_usec = cur->key.event_timeout * 1000 * 1000;
2215 break;
2216 case TK_M_PROGRAM: {
2217 char program[UTIL_PATH_SIZE];
2218 char **envp;
2219 char result[UTIL_PATH_SIZE];
2220
2221 free(event->program_result);
2222 event->program_result = NULL;
2223 udev_event_apply_format(event, &rules->buf[cur->key.value_off], program, sizeof(program));
2224 envp = udev_device_get_properties_envp(event->dev);
2225 log_debug("PROGRAM '%s' %s:%u\n",
2226 program,
2227 &rules->buf[rule->rule.filename_off],
2228 rule->rule.filename_line);
2229
2230 if (udev_event_spawn(event, program, envp, sigmask, result, sizeof(result)) < 0) {
2231 if (cur->key.op != OP_NOMATCH)
2232 goto nomatch;
2233 } else {
2234 int count;
2235
2236 util_remove_trailing_chars(result, '\n');
2237 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2238 count = util_replace_chars(result, UDEV_ALLOWED_CHARS_INPUT);
2239 if (count > 0)
2240 log_debug("%i character(s) replaced\n" , count);
2241 }
2242 event->program_result = strdup(result);
2243 if (cur->key.op == OP_NOMATCH)
2244 goto nomatch;
2245 }
2246 break;
2247 }
2248 case TK_M_IMPORT_FILE: {
2249 char import[UTIL_PATH_SIZE];
2250
2251 udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2252 if (import_file_into_properties(event->dev, import) != 0)
2253 if (cur->key.op != OP_NOMATCH)
2254 goto nomatch;
2255 break;
2256 }
2257 case TK_M_IMPORT_PROG: {
2258 char import[UTIL_PATH_SIZE];
2259
2260 udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2261 log_debug("IMPORT '%s' %s:%u\n",
2262 import,
2263 &rules->buf[rule->rule.filename_off],
2264 rule->rule.filename_line);
2265
2266 if (import_program_into_properties(event, import, sigmask) != 0)
2267 if (cur->key.op != OP_NOMATCH)
2268 goto nomatch;
2269 break;
2270 }
2271 case TK_M_IMPORT_BUILTIN: {
2272 char command[UTIL_PATH_SIZE];
2273
2274 if (udev_builtin_run_once(cur->key.builtin_cmd)) {
2275 /* check if we ran already */
2276 if (event->builtin_run & (1 << cur->key.builtin_cmd)) {
2277 log_debug("IMPORT builtin skip '%s' %s:%u\n",
2278 udev_builtin_name(cur->key.builtin_cmd),
2279 &rules->buf[rule->rule.filename_off],
2280 rule->rule.filename_line);
2281 /* return the result from earlier run */
2282 if (event->builtin_ret & (1 << cur->key.builtin_cmd))
2283 if (cur->key.op != OP_NOMATCH)
2284 goto nomatch;
2285 break;
2286 }
2287 /* mark as ran */
2288 event->builtin_run |= (1 << cur->key.builtin_cmd);
2289 }
2290
2291 udev_event_apply_format(event, &rules->buf[cur->key.value_off], command, sizeof(command));
2292 log_debug("IMPORT builtin '%s' %s:%u\n",
2293 udev_builtin_name(cur->key.builtin_cmd),
2294 &rules->buf[rule->rule.filename_off],
2295 rule->rule.filename_line);
2296
2297 if (udev_builtin_run(event->dev, cur->key.builtin_cmd, command, false) != 0) {
2298 /* remember failure */
2299 log_debug("IMPORT builtin '%s' returned non-zero\n",
2300 udev_builtin_name(cur->key.builtin_cmd));
2301 event->builtin_ret |= (1 << cur->key.builtin_cmd);
2302 if (cur->key.op != OP_NOMATCH)
2303 goto nomatch;
2304 }
2305 break;
2306 }
2307 case TK_M_IMPORT_DB: {
2308 const char *key = &rules->buf[cur->key.value_off];
2309 const char *value;
2310
2311 value = udev_device_get_property_value(event->dev_db, key);
2312 if (value != NULL) {
2313 struct udev_list_entry *entry;
2314
2315 entry = udev_device_add_property(event->dev, key, value);
2316 udev_list_entry_set_num(entry, true);
2317 } else {
2318 if (cur->key.op != OP_NOMATCH)
2319 goto nomatch;
2320 }
2321 break;
2322 }
2323 case TK_M_IMPORT_CMDLINE: {
2324 FILE *f;
2325 bool imported = false;
2326
2327 f = fopen("/proc/cmdline", "r");
2328 if (f != NULL) {
2329 char cmdline[4096];
2330
2331 if (fgets(cmdline, sizeof(cmdline), f) != NULL) {
2332 const char *key = &rules->buf[cur->key.value_off];
2333 char *pos;
2334
2335 pos = strstr(cmdline, key);
2336 if (pos != NULL) {
2337 struct udev_list_entry *entry;
2338
2339 pos += strlen(key);
2340 if (pos[0] == '\0' || isspace(pos[0])) {
2341 /* we import simple flags as 'FLAG=1' */
2342 entry = udev_device_add_property(event->dev, key, "1");
2343 udev_list_entry_set_num(entry, true);
2344 imported = true;
2345 } else if (pos[0] == '=') {
2346 const char *value;
2347
2348 pos++;
2349 value = pos;
2350 while (pos[0] != '\0' && !isspace(pos[0]))
2351 pos++;
2352 pos[0] = '\0';
2353 entry = udev_device_add_property(event->dev, key, value);
2354 udev_list_entry_set_num(entry, true);
2355 imported = true;
2356 }
2357 }
2358 }
2359 fclose(f);
2360 }
2361 if (!imported && cur->key.op != OP_NOMATCH)
2362 goto nomatch;
2363 break;
2364 }
2365 case TK_M_IMPORT_PARENT: {
2366 char import[UTIL_PATH_SIZE];
2367
2368 udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2369 if (import_parent_into_properties(event->dev, import) != 0)
2370 if (cur->key.op != OP_NOMATCH)
2371 goto nomatch;
2372 break;
2373 }
2374 case TK_M_RESULT:
2375 if (match_key(rules, cur, event->program_result) != 0)
2376 goto nomatch;
2377 break;
2378 case TK_A_STRING_ESCAPE_NONE:
2379 esc = ESCAPE_NONE;
2380 break;
2381 case TK_A_STRING_ESCAPE_REPLACE:
2382 esc = ESCAPE_REPLACE;
2383 break;
2384 case TK_A_DB_PERSIST:
2385 udev_device_set_db_persist(event->dev);
2386 break;
2387 case TK_A_INOTIFY_WATCH:
2388 if (event->inotify_watch_final)
2389 break;
2390 if (cur->key.op == OP_ASSIGN_FINAL)
2391 event->inotify_watch_final = true;
2392 event->inotify_watch = cur->key.watch;
2393 break;
2394 case TK_A_DEVLINK_PRIO:
2395 udev_device_set_devlink_priority(event->dev, cur->key.devlink_prio);
2396 break;
2397 case TK_A_OWNER: {
2398 char owner[UTIL_NAME_SIZE];
2399
2400 if (event->owner_final)
2401 break;
2402 if (cur->key.op == OP_ASSIGN_FINAL)
2403 event->owner_final = true;
2404 udev_event_apply_format(event, &rules->buf[cur->key.value_off], owner, sizeof(owner));
2405 event->uid = util_lookup_user(event->udev, owner);
2406 log_debug("OWNER %u %s:%u\n",
2407 event->uid,
2408 &rules->buf[rule->rule.filename_off],
2409 rule->rule.filename_line);
2410 break;
2411 }
2412 case TK_A_GROUP: {
2413 char group[UTIL_NAME_SIZE];
2414
2415 if (event->group_final)
2416 break;
2417 if (cur->key.op == OP_ASSIGN_FINAL)
2418 event->group_final = true;
2419 udev_event_apply_format(event, &rules->buf[cur->key.value_off], group, sizeof(group));
2420 event->gid = util_lookup_group(event->udev, group);
2421 log_debug("GROUP %u %s:%u\n",
2422 event->gid,
2423 &rules->buf[rule->rule.filename_off],
2424 rule->rule.filename_line);
2425 break;
2426 }
2427 case TK_A_MODE: {
2428 char mode_str[UTIL_NAME_SIZE];
2429 mode_t mode;
2430 char *endptr;
2431
2432 if (event->mode_final)
2433 break;
2434 udev_event_apply_format(event, &rules->buf[cur->key.value_off], mode_str, sizeof(mode_str));
2435 mode = strtol(mode_str, &endptr, 8);
2436 if (endptr[0] != '\0') {
2437 log_error("ignoring invalid mode '%s'\n", mode_str);
2438 break;
2439 }
2440 if (cur->key.op == OP_ASSIGN_FINAL)
2441 event->mode_final = true;
2442 event->mode_set = true;
2443 event->mode = mode;
2444 log_debug("MODE %#o %s:%u\n",
2445 event->mode,
2446 &rules->buf[rule->rule.filename_off],
2447 rule->rule.filename_line);
2448 break;
2449 }
2450 case TK_A_OWNER_ID:
2451 if (event->owner_final)
2452 break;
2453 if (cur->key.op == OP_ASSIGN_FINAL)
2454 event->owner_final = true;
2455 event->uid = cur->key.uid;
2456 log_debug("OWNER %u %s:%u\n",
2457 event->uid,
2458 &rules->buf[rule->rule.filename_off],
2459 rule->rule.filename_line);
2460 break;
2461 case TK_A_GROUP_ID:
2462 if (event->group_final)
2463 break;
2464 if (cur->key.op == OP_ASSIGN_FINAL)
2465 event->group_final = true;
2466 event->gid = cur->key.gid;
2467 log_debug("GROUP %u %s:%u\n",
2468 event->gid,
2469 &rules->buf[rule->rule.filename_off],
2470 rule->rule.filename_line);
2471 break;
2472 case TK_A_MODE_ID:
2473 if (event->mode_final)
2474 break;
2475 if (cur->key.op == OP_ASSIGN_FINAL)
2476 event->mode_final = true;
2477 event->mode_set = true;
2478 event->mode = cur->key.mode;
2479 log_debug("MODE %#o %s:%u\n",
2480 event->mode,
2481 &rules->buf[rule->rule.filename_off],
2482 rule->rule.filename_line);
2483 break;
2484 case TK_A_ENV: {
2485 const char *name = &rules->buf[cur->key.attr_off];
2486 char *value = &rules->buf[cur->key.value_off];
2487
2488 if (value[0] != '\0') {
2489 char temp_value[UTIL_NAME_SIZE];
2490 struct udev_list_entry *entry;
2491
2492 udev_event_apply_format(event, value, temp_value, sizeof(temp_value));
2493 entry = udev_device_add_property(event->dev, name, temp_value);
2494 /* store in db, skip private keys */
2495 if (name[0] != '.')
2496 udev_list_entry_set_num(entry, true);
2497 } else {
2498 udev_device_add_property(event->dev, name, NULL);
2499 }
2500 break;
2501 }
2502 case TK_A_TAG: {
2503 char tag[UTIL_PATH_SIZE];
2504 const char *p;
2505
2506 udev_event_apply_format(event, &rules->buf[cur->key.value_off], tag, sizeof(tag));
2507 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2508 udev_device_cleanup_tags_list(event->dev);
2509 for (p = tag; *p != '\0'; p++) {
2510 if ((*p >= 'a' && *p <= 'z') ||
2511 (*p >= 'A' && *p <= 'Z') ||
2512 (*p >= '0' && *p <= '9') ||
2513 *p == '-' || *p == '_')
2514 continue;
2515 log_error("ignoring invalid tag name '%s'\n", tag);
2516 break;
2517 }
2518 udev_device_add_tag(event->dev, tag);
2519 break;
2520 }
2521 case TK_A_NAME: {
2522 const char *name = &rules->buf[cur->key.value_off];
2523
2524 char name_str[UTIL_PATH_SIZE];
2525 int count;
2526
2527 if (event->name_final)
2528 break;
2529 if (cur->key.op == OP_ASSIGN_FINAL)
2530 event->name_final = true;
2531 udev_event_apply_format(event, name, name_str, sizeof(name_str));
2532 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2533 count = util_replace_chars(name_str, "/");
2534 if (count > 0)
2535 log_debug("%i character(s) replaced\n", count);
2536 }
2537 if (major(udev_device_get_devnum(event->dev))) {
2538 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
2539
2540 if (strcmp(name_str, &udev_device_get_devnode(event->dev)[devlen]) != 0) {
2541 log_error("NAME=\"%s\" ignored, kernel device nodes "
2542 "can not be renamed; please fix it in %s:%u\n", name,
2543 &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2544 break;
2545 }
2546 }
2547 free(event->name);
2548 event->name = strdup(name_str);
2549 log_debug("NAME '%s' %s:%u\n",
2550 event->name,
2551 &rules->buf[rule->rule.filename_off],
2552 rule->rule.filename_line);
2553 break;
2554 }
2555 case TK_A_DEVLINK: {
2556 char temp[UTIL_PATH_SIZE];
2557 char filename[UTIL_PATH_SIZE];
2558 char *pos, *next;
2559 int count = 0;
2560
2561 if (event->devlink_final)
2562 break;
2563 if (major(udev_device_get_devnum(event->dev)) == 0)
2564 break;
2565 if (cur->key.op == OP_ASSIGN_FINAL)
2566 event->devlink_final = true;
2567 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2568 udev_device_cleanup_devlinks_list(event->dev);
2569
2570 /* allow multiple symlinks separated by spaces */
2571 udev_event_apply_format(event, &rules->buf[cur->key.value_off], temp, sizeof(temp));
2572 if (esc == ESCAPE_UNSET)
2573 count = util_replace_chars(temp, "/ ");
2574 else if (esc == ESCAPE_REPLACE)
2575 count = util_replace_chars(temp, "/");
2576 if (count > 0)
2577 log_debug("%i character(s) replaced\n" , count);
2578 pos = temp;
2579 while (isspace(pos[0]))
2580 pos++;
2581 next = strchr(pos, ' ');
2582 while (next != NULL) {
2583 next[0] = '\0';
2584 log_debug("LINK '%s' %s:%u\n", pos,
2585 &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2586 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", pos, NULL);
2587 udev_device_add_devlink(event->dev, filename, cur->key.devlink_unique);
2588 while (isspace(next[1]))
2589 next++;
2590 pos = &next[1];
2591 next = strchr(pos, ' ');
2592 }
2593 if (pos[0] != '\0') {
2594 log_debug("LINK '%s' %s:%u\n", pos,
2595 &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2596 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", pos, NULL);
2597 udev_device_add_devlink(event->dev, filename, cur->key.devlink_unique);
2598 }
2599 break;
2600 }
2601 case TK_A_ATTR: {
2602 const char *key_name = &rules->buf[cur->key.attr_off];
2603 char attr[UTIL_PATH_SIZE];
2604 char value[UTIL_NAME_SIZE];
2605 FILE *f;
2606
2607 if (util_resolve_subsys_kernel(event->udev, key_name, attr, sizeof(attr), 0) != 0)
2608 util_strscpyl(attr, sizeof(attr), udev_device_get_syspath(event->dev), "/", key_name, NULL);
2609 attr_subst_subdir(attr, sizeof(attr));
2610
2611 udev_event_apply_format(event, &rules->buf[cur->key.value_off], value, sizeof(value));
2612 log_debug("ATTR '%s' writing '%s' %s:%u\n", attr, value,
2613 &rules->buf[rule->rule.filename_off],
2614 rule->rule.filename_line);
2615 f = fopen(attr, "w");
2616 if (f != NULL) {
2617 if (fprintf(f, "%s", value) <= 0)
2618 log_error("error writing ATTR{%s}: %m\n", attr);
2619 fclose(f);
2620 } else {
2621 log_error("error opening ATTR{%s} for writing: %m\n", attr);
2622 }
2623 break;
2624 }
2625 case TK_A_RUN_BUILTIN:
2626 case TK_A_RUN_PROGRAM: {
2627 struct udev_list_entry *entry;
2628
2629 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2630 udev_list_cleanup(&event->run_list);
2631 log_debug("RUN '%s' %s:%u\n",
2632 &rules->buf[cur->key.value_off],
2633 &rules->buf[rule->rule.filename_off],
2634 rule->rule.filename_line);
2635 entry = udev_list_entry_add(&event->run_list, &rules->buf[cur->key.value_off], NULL);
2636 udev_list_entry_set_num(entry, cur->key.builtin_cmd);
2637 break;
2638 }
2639 case TK_A_GOTO:
2640 if (cur->key.rule_goto == 0)
2641 break;
2642 cur = &rules->tokens[cur->key.rule_goto];
2643 continue;
2644 case TK_END:
2645 return 0;
2646
2647 case TK_M_PARENTS_MIN:
2648 case TK_M_PARENTS_MAX:
2649 case TK_M_MAX:
2650 case TK_UNSET:
2651 log_error("wrong type %u\n", cur->type);
2652 goto nomatch;
2653 }
2654
2655 cur++;
2656 continue;
2657 nomatch:
2658 /* fast-forward to next rule */
2659 cur = rule + rule->rule.token_count;
2660 }
2661 }
2662
2663 void udev_rules_apply_static_dev_perms(struct udev_rules *rules)
2664 {
2665 struct token *cur;
2666 struct token *rule;
2667 uid_t uid = 0;
2668 gid_t gid = 0;
2669 mode_t mode = 0;
2670
2671 if (rules->tokens == NULL)
2672 return;
2673
2674 cur = &rules->tokens[0];
2675 rule = cur;
2676 for (;;) {
2677 switch (cur->type) {
2678 case TK_RULE:
2679 /* current rule */
2680 rule = cur;
2681
2682 /* skip rules without a static_node tag */
2683 if (!rule->rule.has_static_node)
2684 goto next;
2685
2686 uid = 0;
2687 gid = 0;
2688 mode = 0;
2689 break;
2690 case TK_A_OWNER_ID:
2691 uid = cur->key.uid;
2692 break;
2693 case TK_A_GROUP_ID:
2694 gid = cur->key.gid;
2695 break;
2696 case TK_A_MODE_ID:
2697 mode = cur->key.mode;
2698 break;
2699 case TK_A_STATIC_NODE: {
2700 char filename[UTIL_PATH_SIZE];
2701 struct stat stats;
2702
2703 /* we assure, that the permissions tokens are sorted before the static token */
2704 if (mode == 0 && uid == 0 && gid == 0)
2705 goto next;
2706 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(rules->udev), "/",
2707 &rules->buf[cur->key.value_off], NULL);
2708 if (stat(filename, &stats) != 0)
2709 goto next;
2710 if (!S_ISBLK(stats.st_mode) && !S_ISCHR(stats.st_mode))
2711 goto next;
2712 if (mode == 0) {
2713 if (gid > 0)
2714 mode = 0660;
2715 else
2716 mode = 0600;
2717 }
2718 if (mode != (stats.st_mode & 01777)) {
2719 chmod(filename, mode);
2720 log_debug("chmod '%s' %#o\n", filename, mode);
2721 }
2722
2723 if ((uid != 0 && uid != stats.st_uid) || (gid != 0 && gid != stats.st_gid)) {
2724 chown(filename, uid, gid);
2725 log_debug("chown '%s' %u %u\n", filename, uid, gid);
2726 }
2727
2728 utimensat(AT_FDCWD, filename, NULL, 0);
2729 break;
2730 }
2731 case TK_END:
2732 return;
2733 }
2734
2735 cur++;
2736 continue;
2737 next:
2738 /* fast-forward to next rule */
2739 cur = rule + rule->rule.token_count;
2740 continue;
2741 }
2742 }
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