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Fix building of documentation when doing out-of-source builds.
[thirdparty/systemd.git] / udev / udev-rules.c
1 /*
2 * Copyright (C) 2003-2009 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 <string.h>
23 #include <stdio.h>
24 #include <fcntl.h>
25 #include <ctype.h>
26 #include <unistd.h>
27 #include <errno.h>
28 #include <dirent.h>
29 #include <fnmatch.h>
30
31 #include "udev.h"
32
33 #define PREALLOC_TOKEN 2048
34 #define PREALLOC_STRBUF 32 * 1024
35 #define PREALLOC_TRIE 256
36
37 struct uid_gid {
38 unsigned int name_off;
39 union {
40 uid_t uid;
41 gid_t gid;
42 };
43 };
44
45 struct trie_node {
46 /* this node's first child */
47 unsigned int child_idx;
48 /* the next child of our parent node's child list */
49 unsigned int next_child_idx;
50 /* this node's last child (shortcut for append) */
51 unsigned int last_child_idx;
52 unsigned int value_off;
53 unsigned short value_len;
54 unsigned char key;
55 };
56
57 struct udev_rules {
58 struct udev *udev;
59 int resolve_names;
60
61 /* every key in the rules file becomes a token */
62 struct token *tokens;
63 unsigned int token_cur;
64 unsigned int token_max;
65
66 /* all key strings are copied to a single string buffer */
67 char *buf;
68 size_t buf_cur;
69 size_t buf_max;
70 unsigned int buf_count;
71
72 /* during rule parsing, strings are indexed to find duplicates */
73 struct trie_node *trie_nodes;
74 unsigned int trie_nodes_cur;
75 unsigned int trie_nodes_max;
76
77 /* during rule parsing, uid/gid lookup results are cached */
78 struct uid_gid *uids;
79 unsigned int uids_cur;
80 unsigned int uids_max;
81 struct uid_gid *gids;
82 unsigned int gids_cur;
83 unsigned int gids_max;
84 };
85
86 /* KEY=="", KEY!="", KEY+="", KEY="", KEY:="" */
87 enum operation_type {
88 OP_UNSET,
89
90 OP_MATCH,
91 OP_NOMATCH,
92 OP_MATCH_MAX,
93
94 OP_ADD,
95 OP_ASSIGN,
96 OP_ASSIGN_FINAL,
97 };
98
99 enum string_glob_type {
100 GL_UNSET,
101 GL_PLAIN, /* no special chars */
102 GL_GLOB, /* shell globs ?,*,[] */
103 GL_SPLIT, /* multi-value A|B */
104 GL_SPLIT_GLOB, /* multi-value with glob A*|B* */
105 GL_SOMETHING, /* commonly used "?*" */
106 };
107
108 enum string_subst_type {
109 SB_UNSET,
110 SB_NONE,
111 SB_FORMAT,
112 SB_SUBSYS,
113 };
114
115 /* tokens of a rule are sorted/handled in this order */
116 enum token_type {
117 TK_UNSET,
118 TK_RULE,
119
120 TK_M_ACTION, /* val */
121 TK_M_DEVPATH, /* val */
122 TK_M_KERNEL, /* val */
123 TK_M_DEVLINK, /* val */
124 TK_M_NAME, /* val */
125 TK_M_ENV, /* val, attr */
126 TK_M_SUBSYSTEM, /* val */
127 TK_M_DRIVER, /* val */
128 TK_M_WAITFOR, /* val */
129 TK_M_ATTR, /* val, attr */
130
131 TK_M_PARENTS_MIN,
132 TK_M_KERNELS, /* val */
133 TK_M_SUBSYSTEMS, /* val */
134 TK_M_DRIVERS, /* val */
135 TK_M_ATTRS, /* val, attr */
136 TK_M_PARENTS_MAX,
137
138 TK_M_TEST, /* val, mode_t */
139 TK_M_PROGRAM, /* val */
140 TK_M_IMPORT_FILE, /* val */
141 TK_M_IMPORT_PROG, /* val */
142 TK_M_IMPORT_PARENT, /* val */
143 TK_M_RESULT, /* val */
144 TK_M_MAX,
145
146 TK_A_IGNORE_DEVICE,
147 TK_A_STRING_ESCAPE_NONE,
148 TK_A_STRING_ESCAPE_REPLACE,
149 TK_A_INOTIFY_WATCH, /* int */
150 TK_A_NUM_FAKE_PART, /* int */
151 TK_A_DEVLINK_PRIO, /* int */
152 TK_A_OWNER, /* val */
153 TK_A_GROUP, /* val */
154 TK_A_MODE, /* val */
155 TK_A_OWNER_ID, /* uid_t */
156 TK_A_GROUP_ID, /* gid_t */
157 TK_A_MODE_ID, /* mode_t */
158 TK_A_ENV, /* val, attr */
159 TK_A_NAME, /* val */
160 TK_A_DEVLINK, /* val */
161 TK_A_EVENT_TIMEOUT, /* int */
162 TK_A_IGNORE_REMOVE,
163 TK_A_ATTR, /* val, attr */
164 TK_A_RUN, /* val, bool */
165 TK_A_GOTO, /* size_t */
166 TK_A_LAST_RULE,
167
168 TK_END,
169 };
170
171 /* we try to pack stuff in a way that we take only 12 bytes per token */
172 struct token {
173 union {
174 unsigned char type; /* same as in rule and key */
175 struct {
176 enum token_type type:8;
177 unsigned int flags:8;
178 unsigned short token_count;
179 unsigned int label_off;
180 unsigned short filename_off;
181 unsigned short filename_line;
182 } rule;
183 struct {
184 enum token_type type:8;
185 enum operation_type op:8;
186 enum string_glob_type glob:8;
187 enum string_subst_type subst:4;
188 enum string_subst_type attrsubst:4;
189 unsigned int value_off;
190 union {
191 unsigned int attr_off;
192 int ignore_error;
193 unsigned int rule_goto;
194 mode_t mode;
195 uid_t uid;
196 gid_t gid;
197 int num_fake_part;
198 int devlink_prio;
199 int event_timeout;
200 int watch;
201 };
202 } key;
203 };
204 };
205
206 #define MAX_TK 64
207 struct rule_tmp {
208 struct udev_rules *rules;
209 struct token rule;
210 struct token token[MAX_TK];
211 unsigned int token_cur;
212 };
213
214 #ifdef ENABLE_DEBUG
215 static const char *operation_str(enum operation_type type)
216 {
217 static const char *operation_strs[] = {
218 [OP_UNSET] = "UNSET",
219 [OP_MATCH] = "match",
220 [OP_NOMATCH] = "nomatch",
221 [OP_MATCH_MAX] = "MATCH_MAX",
222
223 [OP_ADD] = "add",
224 [OP_ASSIGN] = "assign",
225 [OP_ASSIGN_FINAL] = "assign-final",
226 } ;
227
228 return operation_strs[type];
229 }
230
231 static const char *string_glob_str(enum string_glob_type type)
232 {
233 static const char *string_glob_strs[] = {
234 [GL_UNSET] = "UNSET",
235 [GL_PLAIN] = "plain",
236 [GL_GLOB] = "glob",
237 [GL_SPLIT] = "split",
238 [GL_SPLIT_GLOB] = "split-glob",
239 [GL_SOMETHING] = "split-glob",
240 };
241
242 return string_glob_strs[type];
243 }
244
245 static const char *token_str(enum token_type type)
246 {
247 static const char *token_strs[] = {
248 [TK_UNSET] = "UNSET",
249 [TK_RULE] = "RULE",
250
251 [TK_M_ACTION] = "M ACTION",
252 [TK_M_DEVPATH] = "M DEVPATH",
253 [TK_M_KERNEL] = "M KERNEL",
254 [TK_M_DEVLINK] = "M DEVLINK",
255 [TK_M_NAME] = "M NAME",
256 [TK_M_ENV] = "M ENV",
257 [TK_M_SUBSYSTEM] = "M SUBSYSTEM",
258 [TK_M_DRIVER] = "M DRIVER",
259 [TK_M_WAITFOR] = "M WAITFOR",
260 [TK_M_ATTR] = "M ATTR",
261
262 [TK_M_PARENTS_MIN] = "M PARENTS_MIN",
263 [TK_M_KERNELS] = "M KERNELS",
264 [TK_M_SUBSYSTEMS] = "M SUBSYSTEMS",
265 [TK_M_DRIVERS] = "M DRIVERS",
266 [TK_M_ATTRS] = "M ATTRS",
267 [TK_M_PARENTS_MAX] = "M PARENTS_MAX",
268
269 [TK_M_TEST] = "M TEST",
270 [TK_M_PROGRAM] = "M PROGRAM",
271 [TK_M_IMPORT_FILE] = "M IMPORT_FILE",
272 [TK_M_IMPORT_PROG] = "M IMPORT_PROG",
273 [TK_M_IMPORT_PARENT] = "M MPORT_PARENT",
274 [TK_M_RESULT] = "M RESULT",
275 [TK_M_MAX] = "M MAX",
276
277 [TK_A_IGNORE_DEVICE] = "A IGNORE_DEVICE",
278 [TK_A_STRING_ESCAPE_NONE] = "A STRING_ESCAPE_NONE",
279 [TK_A_STRING_ESCAPE_REPLACE] = "A STRING_ESCAPE_REPLACE",
280 [TK_A_INOTIFY_WATCH] = "A INOTIFY_WATCH",
281 [TK_A_NUM_FAKE_PART] = "A NUM_FAKE_PART",
282 [TK_A_DEVLINK_PRIO] = "A DEVLINK_PRIO",
283 [TK_A_OWNER] = "A OWNER",
284 [TK_A_GROUP] = "A GROUP",
285 [TK_A_MODE] = "A MODE",
286 [TK_A_OWNER_ID] = "A OWNER_ID",
287 [TK_A_GROUP_ID] = "A GROUP_ID",
288 [TK_A_MODE_ID] = "A MODE_ID",
289 [TK_A_ENV] = "A ENV",
290 [TK_A_NAME] = "A NAME",
291 [TK_A_DEVLINK] = "A DEVLINK",
292 [TK_A_EVENT_TIMEOUT] = "A EVENT_TIMEOUT",
293 [TK_A_IGNORE_REMOVE] = "A IGNORE_REMOVE",
294 [TK_A_ATTR] = "A ATTR",
295 [TK_A_RUN] = "A RUN",
296 [TK_A_GOTO] = "A GOTO",
297 [TK_A_LAST_RULE] = "A LAST_RULE",
298
299 [TK_END] = "END",
300 };
301
302 return token_strs[type];
303 }
304
305 static void dump_token(struct udev_rules *rules, struct token *token)
306 {
307 enum token_type type = token->type;
308 enum operation_type op = token->key.op;
309 enum string_glob_type glob = token->key.glob;
310 const char *value = &rules->buf[token->key.value_off];
311 const char *attr = &rules->buf[token->key.attr_off];
312
313 switch (type) {
314 case TK_RULE:
315 {
316 const char *tks_ptr = (char *)rules->tokens;
317 const char *tk_ptr = (char *)token;
318 unsigned int idx = (tk_ptr - tks_ptr) / sizeof(struct token);
319
320 dbg(rules->udev, "* RULE %s:%u, token: %u, count: %u, label: '%s', flags: 0x%02x\n",
321 &rules->buf[token->rule.filename_off], token->rule.filename_line,
322 idx, token->rule.token_count,
323 &rules->buf[token->rule.label_off],
324 token->rule.flags);
325 break;
326 }
327 case TK_M_ACTION:
328 case TK_M_DEVPATH:
329 case TK_M_KERNEL:
330 case TK_M_SUBSYSTEM:
331 case TK_M_DRIVER:
332 case TK_M_WAITFOR:
333 case TK_M_DEVLINK:
334 case TK_M_NAME:
335 case TK_M_KERNELS:
336 case TK_M_SUBSYSTEMS:
337 case TK_M_DRIVERS:
338 case TK_M_PROGRAM:
339 case TK_M_IMPORT_FILE:
340 case TK_M_IMPORT_PROG:
341 case TK_M_IMPORT_PARENT:
342 case TK_M_RESULT:
343 case TK_A_NAME:
344 case TK_A_DEVLINK:
345 case TK_A_OWNER:
346 case TK_A_GROUP:
347 case TK_A_MODE:
348 case TK_A_RUN:
349 dbg(rules->udev, "%s %s '%s'(%s)\n",
350 token_str(type), operation_str(op), value, string_glob_str(glob));
351 break;
352 case TK_M_ATTR:
353 case TK_M_ATTRS:
354 case TK_M_ENV:
355 case TK_A_ATTR:
356 case TK_A_ENV:
357 dbg(rules->udev, "%s %s '%s' '%s'(%s)\n",
358 token_str(type), operation_str(op), attr, value, string_glob_str(glob));
359 break;
360 case TK_A_IGNORE_DEVICE:
361 case TK_A_STRING_ESCAPE_NONE:
362 case TK_A_STRING_ESCAPE_REPLACE:
363 case TK_A_LAST_RULE:
364 case TK_A_IGNORE_REMOVE:
365 dbg(rules->udev, "%s\n", token_str(type));
366 break;
367 case TK_M_TEST:
368 dbg(rules->udev, "%s %s '%s'(%s) %#o\n",
369 token_str(type), operation_str(op), value, string_glob_str(glob), token->key.mode);
370 break;
371 case TK_A_INOTIFY_WATCH:
372 dbg(rules->udev, "%s %u\n", token_str(type), token->key.watch);
373 break;
374 case TK_A_NUM_FAKE_PART:
375 dbg(rules->udev, "%s %u\n", token_str(type), token->key.num_fake_part);
376 break;
377 case TK_A_DEVLINK_PRIO:
378 dbg(rules->udev, "%s %s %u\n", token_str(type), operation_str(op), token->key.devlink_prio);
379 break;
380 case TK_A_OWNER_ID:
381 dbg(rules->udev, "%s %s %u\n", token_str(type), operation_str(op), token->key.uid);
382 break;
383 case TK_A_GROUP_ID:
384 dbg(rules->udev, "%s %s %u\n", token_str(type), operation_str(op), token->key.gid);
385 break;
386 case TK_A_MODE_ID:
387 dbg(rules->udev, "%s %s %#o\n", token_str(type), operation_str(op), token->key.mode);
388 break;
389 case TK_A_EVENT_TIMEOUT:
390 dbg(rules->udev, "%s %s %u\n", token_str(type), operation_str(op), token->key.event_timeout);
391 break;
392 case TK_A_GOTO:
393 dbg(rules->udev, "%s '%s' %u\n", token_str(type), value, token->key.rule_goto);
394 break;
395 case TK_END:
396 dbg(rules->udev, "* %s\n", token_str(type));
397 break;
398 case TK_M_PARENTS_MIN:
399 case TK_M_PARENTS_MAX:
400 case TK_M_MAX:
401 case TK_UNSET:
402 dbg(rules->udev, "unknown type %u\n", type);
403 break;
404 }
405 }
406
407 static void dump_rules(struct udev_rules *rules)
408 {
409 unsigned int i;
410
411 dbg(rules->udev, "dumping %u (%zu bytes) tokens, %u (%zu bytes) strings\n",
412 rules->token_cur,
413 rules->token_cur * sizeof(struct token),
414 rules->buf_count,
415 rules->buf_cur);
416 for(i = 0; i < rules->token_cur; i++)
417 dump_token(rules, &rules->tokens[i]);
418 }
419 #else
420 static inline const char *operation_str(enum operation_type type) { return NULL; }
421 static inline const char *token_str(enum token_type type) { return NULL; }
422 static inline void dump_token(struct udev_rules *rules, struct token *token) {}
423 static inline void dump_rules(struct udev_rules *rules) {}
424 #endif /* ENABLE_DEBUG */
425
426 static int add_new_string(struct udev_rules *rules, const char *str, size_t bytes)
427 {
428 int off;
429
430 /* grow buffer if needed */
431 if (rules->buf_cur + bytes+1 >= rules->buf_max) {
432 char *buf;
433 unsigned int add;
434
435 /* double the buffer size */
436 add = rules->buf_max;
437 if (add < bytes * 8)
438 add = bytes * 8;
439
440 buf = realloc(rules->buf, rules->buf_max + add);
441 if (buf == NULL)
442 return -1;
443 dbg(rules->udev, "extend buffer from %zu to %zu\n", rules->buf_max, rules->buf_max + add);
444 rules->buf = buf;
445 rules->buf_max += add;
446 }
447 off = rules->buf_cur;
448 memcpy(&rules->buf[rules->buf_cur], str, bytes);
449 rules->buf_cur += bytes;
450 rules->buf_count++;
451 return off;
452 }
453
454 static int add_string(struct udev_rules *rules, const char *str)
455 {
456 unsigned int node_idx;
457 struct trie_node *new_node;
458 unsigned int new_node_idx;
459 unsigned char key;
460 unsigned short len;
461 unsigned int depth;
462 unsigned int off;
463 struct trie_node *parent;
464
465 /* walk trie, start from last character of str to find matching tails */
466 len = strlen(str);
467 key = str[len-1];
468 node_idx = 0;
469 for (depth = 0; depth <= len; depth++) {
470 struct trie_node *node;
471 unsigned int child_idx;
472
473 node = &rules->trie_nodes[node_idx];
474 off = node->value_off + node->value_len - len;
475
476 /* match against current node */
477 if (depth == len || (node->value_len >= len && memcmp(&rules->buf[off], str, len) == 0))
478 return off;
479
480 /* lookup child node */
481 key = str[len - 1 - depth];
482 child_idx = node->child_idx;
483 while (child_idx > 0) {
484 struct trie_node *child;
485
486 child = &rules->trie_nodes[child_idx];
487 if (child->key == key)
488 break;
489 child_idx = child->next_child_idx;
490 }
491 if (child_idx == 0)
492 break;
493 node_idx = child_idx;
494 }
495
496 /* string not found, add it */
497 off = add_new_string(rules, str, len + 1);
498
499 /* grow trie nodes if needed */
500 if (rules->trie_nodes_cur >= rules->trie_nodes_max) {
501 struct trie_node *nodes;
502 unsigned int add;
503
504 /* double the buffer size */
505 add = rules->trie_nodes_max;
506 if (add < 8)
507 add = 8;
508
509 nodes = realloc(rules->trie_nodes, (rules->trie_nodes_max + add) * sizeof(struct trie_node));
510 if (nodes == NULL)
511 return -1;
512 dbg(rules->udev, "extend trie nodes from %u to %u\n",
513 rules->trie_nodes_max, rules->trie_nodes_max + add);
514 rules->trie_nodes = nodes;
515 rules->trie_nodes_max += add;
516 }
517
518 /* get a new node */
519 new_node_idx = rules->trie_nodes_cur;
520 rules->trie_nodes_cur++;
521 new_node = &rules->trie_nodes[new_node_idx];
522 memset(new_node, 0x00, sizeof(struct trie_node));
523 new_node->value_off = off;
524 new_node->value_len = len;
525 new_node->key = key;
526
527 /* join the parent's child list */
528 parent = &rules->trie_nodes[node_idx];
529 if (parent->child_idx == 0) {
530 parent->child_idx = new_node_idx;
531 } else {
532 struct trie_node *last_child;
533
534 last_child = &rules->trie_nodes[parent->last_child_idx];
535 last_child->next_child_idx = new_node_idx;
536 }
537 parent->last_child_idx = new_node_idx;
538 return off;
539 }
540
541 static int add_token(struct udev_rules *rules, struct token *token)
542 {
543 /* grow buffer if needed */
544 if (rules->token_cur+1 >= rules->token_max) {
545 struct token *tokens;
546 unsigned int add;
547
548 /* double the buffer size */
549 add = rules->token_max;
550 if (add < 8)
551 add = 8;
552
553 tokens = realloc(rules->tokens, (rules->token_max + add ) * sizeof(struct token));
554 if (tokens == NULL)
555 return -1;
556 dbg(rules->udev, "extend tokens from %u to %u\n", rules->token_max, rules->token_max + add);
557 rules->tokens = tokens;
558 rules->token_max += add;
559 }
560 memcpy(&rules->tokens[rules->token_cur], token, sizeof(struct token));
561 rules->token_cur++;
562 return 0;
563 }
564
565 static uid_t add_uid(struct udev_rules *rules, const char *owner)
566 {
567 unsigned int i;
568 uid_t uid;
569 unsigned int off;
570
571 /* lookup, if we know it already */
572 for (i = 0; i < rules->uids_cur; i++) {
573 off = rules->uids[i].name_off;
574 if (strcmp(&rules->buf[off], owner) == 0) {
575 uid = rules->uids[i].uid;
576 dbg(rules->udev, "return existing %u for '%s'\n", uid, owner);
577 return uid;
578 }
579 }
580 uid = util_lookup_user(rules->udev, owner);
581
582 /* grow buffer if needed */
583 if (rules->uids_cur+1 >= rules->uids_max) {
584 struct uid_gid *uids;
585 unsigned int add;
586
587 /* double the buffer size */
588 add = rules->uids_max;
589 if (add < 1)
590 add = 8;
591
592 uids = realloc(rules->uids, (rules->uids_max + add ) * sizeof(struct uid_gid));
593 if (uids == NULL)
594 return uid;
595 dbg(rules->udev, "extend uids from %u to %u\n", rules->uids_max, rules->uids_max + add);
596 rules->uids = uids;
597 rules->uids_max += add;
598 }
599 rules->uids[rules->uids_cur].uid = uid;
600 off = add_string(rules, owner);
601 if (off <= 0)
602 return uid;
603 rules->uids[rules->uids_cur].name_off = off;
604 rules->uids_cur++;
605 return uid;
606 }
607
608 static gid_t add_gid(struct udev_rules *rules, const char *group)
609 {
610 unsigned int i;
611 gid_t gid;
612 unsigned int off;
613
614 /* lookup, if we know it already */
615 for (i = 0; i < rules->gids_cur; i++) {
616 off = rules->gids[i].name_off;
617 if (strcmp(&rules->buf[off], group) == 0) {
618 gid = rules->gids[i].gid;
619 dbg(rules->udev, "return existing %u for '%s'\n", gid, group);
620 return gid;
621 }
622 }
623 gid = util_lookup_group(rules->udev, group);
624
625 /* grow buffer if needed */
626 if (rules->gids_cur+1 >= rules->gids_max) {
627 struct uid_gid *gids;
628 unsigned int add;
629
630 /* double the buffer size */
631 add = rules->gids_max;
632 if (add < 1)
633 add = 8;
634
635 gids = realloc(rules->gids, (rules->gids_max + add ) * sizeof(struct uid_gid));
636 if (gids == NULL)
637 return gid;
638 dbg(rules->udev, "extend gids from %u to %u\n", rules->gids_max, rules->gids_max + add);
639 rules->gids = gids;
640 rules->gids_max += add;
641 }
642 rules->gids[rules->gids_cur].gid = gid;
643 off = add_string(rules, group);
644 if (off <= 0)
645 return gid;
646 rules->gids[rules->gids_cur].name_off = off;
647 rules->gids_cur++;
648 return gid;
649 }
650
651 static int import_property_from_string(struct udev_device *dev, char *line)
652 {
653 struct udev *udev = udev_device_get_udev(dev);
654 char *key;
655 char *val;
656 size_t len;
657
658 /* find key */
659 key = line;
660 while (isspace(key[0]))
661 key++;
662
663 /* comment or empty line */
664 if (key[0] == '#' || key[0] == '\0')
665 return -1;
666
667 /* split key/value */
668 val = strchr(key, '=');
669 if (val == NULL)
670 return -1;
671 val[0] = '\0';
672 val++;
673
674 /* find value */
675 while (isspace(val[0]))
676 val++;
677
678 /* terminate key */
679 len = strlen(key);
680 if (len == 0)
681 return -1;
682 while (isspace(key[len-1]))
683 len--;
684 key[len] = '\0';
685
686 /* terminate value */
687 len = strlen(val);
688 if (len == 0)
689 return -1;
690 while (isspace(val[len-1]))
691 len--;
692 val[len] = '\0';
693
694 if (len == 0)
695 return -1;
696
697 /* unquote */
698 if (val[0] == '"' || val[0] == '\'') {
699 if (val[len-1] != val[0]) {
700 info(udev, "inconsistent quoting: '%s', skip\n", line);
701 return -1;
702 }
703 val[len-1] = '\0';
704 val++;
705 }
706
707 dbg(udev, "adding '%s'='%s'\n", key, val);
708
709 /* handle device, renamed by external tool, returning new path */
710 if (strcmp(key, "DEVPATH") == 0) {
711 char syspath[UTIL_PATH_SIZE];
712
713 info(udev, "updating devpath from '%s' to '%s'\n",
714 udev_device_get_devpath(dev), val);
715 util_strscpyl(syspath, sizeof(syspath), udev_get_sys_path(udev), val, NULL);
716 udev_device_set_syspath(dev, syspath);
717 } else {
718 struct udev_list_entry *entry;
719
720 entry = udev_device_add_property(dev, key, val);
721 /* store in db, skip private keys */
722 if (key[0] != '.')
723 udev_list_entry_set_flag(entry, 1);
724 }
725 return 0;
726 }
727
728 static int import_file_into_properties(struct udev_device *dev, const char *filename)
729 {
730 FILE *f;
731 char line[UTIL_LINE_SIZE];
732
733 f = fopen(filename, "r");
734 if (f == NULL)
735 return -1;
736 while (fgets(line, sizeof(line), f) != NULL)
737 import_property_from_string(dev, line);
738 fclose(f);
739 return 0;
740 }
741
742 static int import_program_into_properties(struct udev_device *dev, const char *program)
743 {
744 struct udev *udev = udev_device_get_udev(dev);
745 char **envp;
746 char result[4096];
747 size_t reslen;
748 char *line;
749
750 envp = udev_device_get_properties_envp(dev);
751 if (util_run_program(udev, program, envp, result, sizeof(result), &reslen) != 0)
752 return -1;
753
754 line = result;
755 while (line != NULL) {
756 char *pos;
757
758 pos = strchr(line, '\n');
759 if (pos != NULL) {
760 pos[0] = '\0';
761 pos = &pos[1];
762 }
763 import_property_from_string(dev, line);
764 line = pos;
765 }
766 return 0;
767 }
768
769 static int import_parent_into_properties(struct udev_device *dev, const char *filter)
770 {
771 struct udev *udev = udev_device_get_udev(dev);
772 struct udev_device *dev_parent;
773 struct udev_list_entry *list_entry;
774
775 dev_parent = udev_device_get_parent(dev);
776 if (dev_parent == NULL)
777 return -1;
778
779 dbg(udev, "found parent '%s', get the node name\n", udev_device_get_syspath(dev_parent));
780 udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(dev_parent)) {
781 const char *key = udev_list_entry_get_name(list_entry);
782 const char *val = udev_list_entry_get_value(list_entry);
783
784 if (fnmatch(filter, key, 0) == 0) {
785 struct udev_list_entry *entry;
786
787 dbg(udev, "import key '%s=%s'\n", key, val);
788 entry = udev_device_add_property(dev, key, val);
789 /* store in db, skip private keys */
790 if (key[0] != '.')
791 udev_list_entry_set_flag(entry, 1);
792 }
793 }
794 return 0;
795 }
796
797 #define WAIT_LOOP_PER_SECOND 50
798 static int wait_for_file(struct udev_device *dev, const char *file, int timeout)
799 {
800 struct udev *udev = udev_device_get_udev(dev);
801 char filepath[UTIL_PATH_SIZE];
802 char devicepath[UTIL_PATH_SIZE];
803 struct stat stats;
804 int loop = timeout * WAIT_LOOP_PER_SECOND;
805
806 /* a relative path is a device attribute */
807 devicepath[0] = '\0';
808 if (file[0] != '/') {
809 util_strscpyl(devicepath, sizeof(devicepath),
810 udev_get_sys_path(udev), udev_device_get_devpath(dev), NULL);
811 util_strscpyl(filepath, sizeof(filepath), devicepath, "/", file, NULL);
812 file = filepath;
813 }
814
815 dbg(udev, "will wait %i sec for '%s'\n", timeout, file);
816 while (--loop) {
817 /* lookup file */
818 if (stat(file, &stats) == 0) {
819 info(udev, "file '%s' appeared after %i loops\n", file, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
820 return 0;
821 }
822 /* make sure, the device did not disappear in the meantime */
823 if (devicepath[0] != '\0' && stat(devicepath, &stats) != 0) {
824 info(udev, "device disappeared while waiting for '%s'\n", file);
825 return -2;
826 }
827 info(udev, "wait for '%s' for %i mseconds\n", file, 1000 / WAIT_LOOP_PER_SECOND);
828 usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
829 }
830 info(udev, "waiting for '%s' failed\n", file);
831 return -1;
832 }
833
834 static int attr_subst_subdir(char *attr, size_t len)
835 {
836 int found = 0;
837
838 if (strstr(attr, "/*/")) {
839 char *pos;
840 char dirname[UTIL_PATH_SIZE];
841 const char *tail;
842 DIR *dir;
843
844 util_strscpy(dirname, sizeof(dirname), attr);
845 pos = strstr(dirname, "/*/");
846 if (pos == NULL)
847 return -1;
848 pos[0] = '\0';
849 tail = &pos[2];
850 dir = opendir(dirname);
851 if (dir != NULL) {
852 struct dirent *dent;
853
854 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
855 struct stat stats;
856
857 if (dent->d_name[0] == '.')
858 continue;
859 util_strscpyl(attr, len, dirname, "/", dent->d_name, tail, NULL);
860 if (stat(attr, &stats) == 0) {
861 found = 1;
862 break;
863 }
864 }
865 closedir(dir);
866 }
867 }
868
869 return found;
870 }
871
872 static int get_key(struct udev *udev, char **line, char **key, enum operation_type *op, char **value)
873 {
874 char *linepos;
875 char *temp;
876
877 linepos = *line;
878 if (linepos == NULL && linepos[0] == '\0')
879 return -1;
880
881 /* skip whitespace */
882 while (isspace(linepos[0]) || linepos[0] == ',')
883 linepos++;
884
885 /* get the key */
886 if (linepos[0] == '\0')
887 return -1;
888 *key = linepos;
889
890 while (1) {
891 linepos++;
892 if (linepos[0] == '\0')
893 return -1;
894 if (isspace(linepos[0]))
895 break;
896 if (linepos[0] == '=')
897 break;
898 if ((linepos[0] == '+') || (linepos[0] == '!') || (linepos[0] == ':'))
899 if (linepos[1] == '=')
900 break;
901 }
902
903 /* remember end of key */
904 temp = linepos;
905
906 /* skip whitespace after key */
907 while (isspace(linepos[0]))
908 linepos++;
909 if (linepos[0] == '\0')
910 return -1;
911
912 /* get operation type */
913 if (linepos[0] == '=' && linepos[1] == '=') {
914 *op = OP_MATCH;
915 linepos += 2;
916 } else if (linepos[0] == '!' && linepos[1] == '=') {
917 *op = OP_NOMATCH;
918 linepos += 2;
919 } else if (linepos[0] == '+' && linepos[1] == '=') {
920 *op = OP_ADD;
921 linepos += 2;
922 } else if (linepos[0] == '=') {
923 *op = OP_ASSIGN;
924 linepos++;
925 } else if (linepos[0] == ':' && linepos[1] == '=') {
926 *op = OP_ASSIGN_FINAL;
927 linepos += 2;
928 } else
929 return -1;
930
931 /* terminate key */
932 temp[0] = '\0';
933
934 /* skip whitespace after operator */
935 while (isspace(linepos[0]))
936 linepos++;
937 if (linepos[0] == '\0')
938 return -1;
939
940 /* get the value */
941 if (linepos[0] == '"')
942 linepos++;
943 else
944 return -1;
945 *value = linepos;
946
947 /* terminate */
948 temp = strchr(linepos, '"');
949 if (!temp)
950 return -1;
951 temp[0] = '\0';
952 temp++;
953 dbg(udev, "%s '%s'-'%s'\n", operation_str(*op), *key, *value);
954
955 /* move line to next key */
956 *line = temp;
957 return 0;
958 }
959
960 /* extract possible KEY{attr} */
961 static char *get_key_attribute(struct udev *udev, char *str)
962 {
963 char *pos;
964 char *attr;
965
966 attr = strchr(str, '{');
967 if (attr != NULL) {
968 attr++;
969 pos = strchr(attr, '}');
970 if (pos == NULL) {
971 err(udev, "missing closing brace for format\n");
972 return NULL;
973 }
974 pos[0] = '\0';
975 dbg(udev, "attribute='%s'\n", attr);
976 return attr;
977 }
978 return NULL;
979 }
980
981 static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
982 enum operation_type op,
983 const char *value, const void *data)
984 {
985 struct token *token = &rule_tmp->token[rule_tmp->token_cur];
986 const char *attr = NULL;
987
988 memset(token, 0x00, sizeof(struct token));
989
990 switch (type) {
991 case TK_M_ACTION:
992 case TK_M_DEVPATH:
993 case TK_M_KERNEL:
994 case TK_M_SUBSYSTEM:
995 case TK_M_DRIVER:
996 case TK_M_WAITFOR:
997 case TK_M_DEVLINK:
998 case TK_M_NAME:
999 case TK_M_KERNELS:
1000 case TK_M_SUBSYSTEMS:
1001 case TK_M_DRIVERS:
1002 case TK_M_PROGRAM:
1003 case TK_M_IMPORT_FILE:
1004 case TK_M_IMPORT_PROG:
1005 case TK_M_IMPORT_PARENT:
1006 case TK_M_RESULT:
1007 case TK_A_OWNER:
1008 case TK_A_GROUP:
1009 case TK_A_MODE:
1010 case TK_A_NAME:
1011 case TK_A_DEVLINK:
1012 case TK_A_GOTO:
1013 token->key.value_off = add_string(rule_tmp->rules, value);
1014 break;
1015 case TK_M_ENV:
1016 case TK_M_ATTR:
1017 case TK_M_ATTRS:
1018 case TK_A_ATTR:
1019 case TK_A_ENV:
1020 attr = data;
1021 token->key.value_off = add_string(rule_tmp->rules, value);
1022 token->key.attr_off = add_string(rule_tmp->rules, attr);
1023 break;
1024 case TK_M_TEST:
1025 token->key.value_off = add_string(rule_tmp->rules, value);
1026 if (data != NULL)
1027 token->key.mode = *(mode_t *)data;
1028 break;
1029 case TK_A_IGNORE_DEVICE:
1030 case TK_A_STRING_ESCAPE_NONE:
1031 case TK_A_STRING_ESCAPE_REPLACE:
1032 case TK_A_IGNORE_REMOVE:
1033 case TK_A_LAST_RULE:
1034 break;
1035 case TK_A_RUN:
1036 token->key.value_off = add_string(rule_tmp->rules, value);
1037 token->key.ignore_error = *(int *)data;
1038 break;
1039 case TK_A_INOTIFY_WATCH:
1040 case TK_A_NUM_FAKE_PART:
1041 case TK_A_DEVLINK_PRIO:
1042 token->key.devlink_prio = *(int *)data;
1043 break;
1044 case TK_A_OWNER_ID:
1045 token->key.uid = *(uid_t *)data;
1046 break;
1047 case TK_A_GROUP_ID:
1048 token->key.gid = *(gid_t *)data;
1049 break;
1050 case TK_A_MODE_ID:
1051 token->key.mode = *(mode_t *)data;
1052 break;
1053 case TK_A_EVENT_TIMEOUT:
1054 token->key.event_timeout = *(int *)data;
1055 break;
1056 case TK_RULE:
1057 case TK_M_PARENTS_MIN:
1058 case TK_M_PARENTS_MAX:
1059 case TK_M_MAX:
1060 case TK_END:
1061 case TK_UNSET:
1062 err(rule_tmp->rules->udev, "wrong type %u\n", type);
1063 return -1;
1064 }
1065
1066 if (value != NULL && type < TK_M_MAX) {
1067 /* check if we need to split or call fnmatch() while matching rules */
1068 enum string_glob_type glob;
1069 int has_split;
1070 int has_glob;
1071
1072 has_split = (strchr(value, '|') != NULL);
1073 has_glob = (strchr(value, '*') != NULL || strchr(value, '?') != NULL || strchr(value, '[') != NULL);
1074 if (has_split && has_glob) {
1075 glob = GL_SPLIT_GLOB;
1076 } else if (has_split) {
1077 glob = GL_SPLIT;
1078 } else if (has_glob) {
1079 if (strcmp(value, "?*") == 0)
1080 glob = GL_SOMETHING;
1081 else
1082 glob = GL_GLOB;
1083 } else {
1084 glob = GL_PLAIN;
1085 }
1086 token->key.glob = glob;
1087 }
1088
1089 if (value != NULL && type > TK_M_MAX) {
1090 /* check if assigned value has substitution chars */
1091 if (value[0] == '[')
1092 token->key.subst = SB_SUBSYS;
1093 else if (strchr(value, '%') != NULL || strchr(value, '$') != NULL)
1094 token->key.subst = SB_FORMAT;
1095 else
1096 token->key.subst = SB_NONE;
1097 }
1098
1099 if (attr != NULL) {
1100 /* check if property/attribut name has substitution chars */
1101 if (attr[0] == '[')
1102 token->key.attrsubst = SB_SUBSYS;
1103 else if (strchr(attr, '%') != NULL || strchr(attr, '$') != NULL)
1104 token->key.attrsubst = SB_FORMAT;
1105 else
1106 token->key.attrsubst = SB_NONE;
1107 }
1108
1109 token->key.type = type;
1110 token->key.op = op;
1111 rule_tmp->token_cur++;
1112 if (rule_tmp->token_cur >= ARRAY_SIZE(rule_tmp->token)) {
1113 err(rule_tmp->rules->udev, "temporary rule array too small\n");
1114 return -1;
1115 }
1116 return 0;
1117 }
1118
1119 static int sort_token(struct udev_rules *rules, struct rule_tmp *rule_tmp)
1120 {
1121 unsigned int i;
1122 unsigned int start = 0;
1123 unsigned int end = rule_tmp->token_cur;
1124
1125 for (i = 0; i < rule_tmp->token_cur; i++) {
1126 enum token_type next_val = TK_UNSET;
1127 unsigned int next_idx;
1128 unsigned int j;
1129
1130 /* find smallest value */
1131 for (j = start; j < end; j++) {
1132 if (rule_tmp->token[j].type == TK_UNSET)
1133 continue;
1134 if (next_val == TK_UNSET || rule_tmp->token[j].type < next_val) {
1135 next_val = rule_tmp->token[j].type;
1136 next_idx = j;
1137 }
1138 }
1139
1140 /* add token and mark done */
1141 if (add_token(rules, &rule_tmp->token[next_idx]) != 0)
1142 return -1;
1143 rule_tmp->token[next_idx].type = TK_UNSET;
1144
1145 /* shrink range */
1146 if (next_idx == start)
1147 start++;
1148 if (next_idx+1 == end)
1149 end--;
1150 }
1151 return 0;
1152 }
1153
1154 static int add_rule(struct udev_rules *rules, char *line,
1155 const char *filename, unsigned int filename_off, unsigned int lineno)
1156 {
1157 char *linepos;
1158 char *attr;
1159 struct rule_tmp rule_tmp;
1160
1161 memset(&rule_tmp, 0x00, sizeof(struct rule_tmp));
1162 rule_tmp.rules = rules;
1163 rule_tmp.rule.type = TK_RULE;
1164 rule_tmp.rule.rule.filename_off = filename_off;
1165 rule_tmp.rule.rule.filename_line = lineno;
1166
1167 linepos = line;
1168 while (1) {
1169 char *key;
1170 char *value;
1171 enum operation_type op;
1172
1173 if (get_key(rules->udev, &linepos, &key, &op, &value) != 0)
1174 break;
1175
1176 if (strcmp(key, "ACTION") == 0) {
1177 if (op > OP_MATCH_MAX) {
1178 err(rules->udev, "invalid ACTION operation\n");
1179 goto invalid;
1180 }
1181 rule_add_key(&rule_tmp, TK_M_ACTION, op, value, NULL);
1182 continue;
1183 }
1184
1185 if (strcmp(key, "DEVPATH") == 0) {
1186 if (op > OP_MATCH_MAX) {
1187 err(rules->udev, "invalid DEVPATH operation\n");
1188 goto invalid;
1189 }
1190 rule_add_key(&rule_tmp, TK_M_DEVPATH, op, value, NULL);
1191 continue;
1192 }
1193
1194 if (strcmp(key, "KERNEL") == 0) {
1195 if (op > OP_MATCH_MAX) {
1196 err(rules->udev, "invalid KERNEL operation\n");
1197 goto invalid;
1198 }
1199 rule_add_key(&rule_tmp, TK_M_KERNEL, op, value, NULL);
1200 continue;
1201 }
1202
1203 if (strcmp(key, "SUBSYSTEM") == 0) {
1204 if (op > OP_MATCH_MAX) {
1205 err(rules->udev, "invalid SUBSYSTEM operation\n");
1206 goto invalid;
1207 }
1208 /* bus, class, subsystem events should all be the same */
1209 if (strcmp(value, "subsystem") == 0 ||
1210 strcmp(value, "bus") == 0 ||
1211 strcmp(value, "class") == 0) {
1212 if (strcmp(value, "bus") == 0 || strcmp(value, "class") == 0)
1213 err(rules->udev, "'%s' must be specified as 'subsystem' \n"
1214 "please fix it in %s:%u", value, filename, lineno);
1215 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, "subsystem|class|bus", NULL);
1216 } else
1217 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, value, NULL);
1218 continue;
1219 }
1220
1221 if (strcmp(key, "DRIVER") == 0) {
1222 if (op > OP_MATCH_MAX) {
1223 err(rules->udev, "invalid DRIVER operation\n");
1224 goto invalid;
1225 }
1226 rule_add_key(&rule_tmp, TK_M_DRIVER, op, value, NULL);
1227 continue;
1228 }
1229
1230 if (strncmp(key, "ATTR{", sizeof("ATTR{")-1) == 0) {
1231 attr = get_key_attribute(rules->udev, key + sizeof("ATTR")-1);
1232 if (attr == NULL) {
1233 err(rules->udev, "error parsing ATTR attribute\n");
1234 goto invalid;
1235 }
1236 if (op < OP_MATCH_MAX) {
1237 rule_add_key(&rule_tmp, TK_M_ATTR, op, value, attr);
1238 } else {
1239 rule_add_key(&rule_tmp, TK_A_ATTR, op, value, attr);
1240 }
1241 continue;
1242 }
1243
1244 if (strcmp(key, "KERNELS") == 0 ||
1245 strcmp(key, "ID") == 0) {
1246 if (op > OP_MATCH_MAX) {
1247 err(rules->udev, "invalid KERNELS operation\n");
1248 goto invalid;
1249 }
1250 rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1251 continue;
1252 }
1253
1254 if (strcmp(key, "SUBSYSTEMS") == 0 ||
1255 strcmp(key, "BUS") == 0) {
1256 if (op > OP_MATCH_MAX) {
1257 err(rules->udev, "invalid SUBSYSTEMS operation\n");
1258 goto invalid;
1259 }
1260 rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1261 continue;
1262 }
1263
1264 if (strcmp(key, "DRIVERS") == 0) {
1265 if (op > OP_MATCH_MAX) {
1266 err(rules->udev, "invalid DRIVERS operation\n");
1267 goto invalid;
1268 }
1269 rule_add_key(&rule_tmp, TK_M_DRIVERS, op, value, NULL);
1270 continue;
1271 }
1272
1273 if (strncmp(key, "ATTRS{", sizeof("ATTRS{")-1) == 0 ||
1274 strncmp(key, "SYSFS{", sizeof("SYSFS{")-1) == 0) {
1275 if (op > OP_MATCH_MAX) {
1276 err(rules->udev, "invalid ATTRS operation\n");
1277 goto invalid;
1278 }
1279 attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);
1280 if (attr == NULL) {
1281 err(rules->udev, "error parsing ATTRS attribute\n");
1282 goto invalid;
1283 }
1284 if (strncmp(attr, "device/", 7) == 0)
1285 err(rules->udev, "the 'device' link may not be available in a future kernel, "
1286 "please fix it in %s:%u", filename, lineno);
1287 else if (strstr(attr, "../") != NULL)
1288 err(rules->udev, "do not reference parent sysfs directories directly, "
1289 "it may break with a future kernel, please fix it in %s:%u", filename, lineno);
1290 rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1291 continue;
1292 }
1293
1294 if (strncmp(key, "ENV{", sizeof("ENV{")-1) == 0) {
1295 attr = get_key_attribute(rules->udev, key + sizeof("ENV")-1);
1296 if (attr == NULL) {
1297 err(rules->udev, "error parsing ENV attribute\n");
1298 goto invalid;
1299 }
1300 if (op < OP_MATCH_MAX) {
1301 if (rule_add_key(&rule_tmp, TK_M_ENV, op, value, attr) != 0)
1302 goto invalid;
1303 } else {
1304 if (rule_add_key(&rule_tmp, TK_A_ENV, op, value, attr) != 0)
1305 goto invalid;
1306 }
1307 continue;
1308 }
1309
1310 if (strcmp(key, "PROGRAM") == 0) {
1311 rule_add_key(&rule_tmp, TK_M_PROGRAM, op, value, NULL);
1312 continue;
1313 }
1314
1315 if (strcmp(key, "RESULT") == 0) {
1316 if (op > OP_MATCH_MAX) {
1317 err(rules->udev, "invalid RESULT operation\n");
1318 goto invalid;
1319 }
1320 rule_add_key(&rule_tmp, TK_M_RESULT, op, value, NULL);
1321 continue;
1322 }
1323
1324 if (strncmp(key, "IMPORT", sizeof("IMPORT")-1) == 0) {
1325 attr = get_key_attribute(rules->udev, key + sizeof("IMPORT")-1);
1326 if (attr != NULL && strstr(attr, "program")) {
1327 dbg(rules->udev, "IMPORT will be executed\n");
1328 rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1329 } else if (attr != NULL && strstr(attr, "file")) {
1330 dbg(rules->udev, "IMPORT will be included as file\n");
1331 rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1332 } else if (attr != NULL && strstr(attr, "parent")) {
1333 dbg(rules->udev, "IMPORT will include the parent values\n");
1334 rule_add_key(&rule_tmp, TK_M_IMPORT_PARENT, op, value, NULL);
1335 } else {
1336 /* figure it out if it is executable */
1337 char file[UTIL_PATH_SIZE];
1338 char *pos;
1339 struct stat statbuf;
1340
1341 /* allow programs in /lib/udev called without the path */
1342 if (value[0] != '/')
1343 util_strscpyl(file, sizeof(file), LIBEXECDIR "/", value, NULL);
1344 else
1345 util_strscpy(file, sizeof(file), value);
1346 pos = strchr(file, ' ');
1347 if (pos)
1348 pos[0] = '\0';
1349 dbg(rules->udev, "IMPORT auto mode for '%s'\n", file);
1350 if (stat(file, &statbuf) == 0 && (statbuf.st_mode & S_IXUSR)) {
1351 dbg(rules->udev, "IMPORT will be executed (autotype)\n");
1352 rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1353 } else {
1354 dbg(rules->udev, "IMPORT will be included as file (autotype)\n");
1355 rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1356 }
1357 }
1358 continue;
1359 }
1360
1361 if (strncmp(key, "TEST", sizeof("TEST")-1) == 0) {
1362 mode_t mode = 0;
1363
1364 if (op > OP_MATCH_MAX) {
1365 err(rules->udev, "invalid TEST operation\n");
1366 goto invalid;
1367 }
1368 attr = get_key_attribute(rules->udev, key + sizeof("TEST")-1);
1369 if (attr != NULL) {
1370 mode = strtol(attr, NULL, 8);
1371 rule_add_key(&rule_tmp, TK_M_TEST, op, value, &mode);
1372 } else {
1373 rule_add_key(&rule_tmp, TK_M_TEST, op, value, NULL);
1374 }
1375 continue;
1376 }
1377
1378 if (strncmp(key, "RUN", sizeof("RUN")-1) == 0) {
1379 int flag = 0;
1380
1381 attr = get_key_attribute(rules->udev, key + sizeof("RUN")-1);
1382 if (attr != NULL && strstr(attr, "fail_event_on_error"))
1383 flag = 1;
1384 rule_add_key(&rule_tmp, TK_A_RUN, op, value, &flag);
1385 continue;
1386 }
1387
1388 if (strcmp(key, "WAIT_FOR") == 0 || strcmp(key, "WAIT_FOR_SYSFS") == 0) {
1389 rule_add_key(&rule_tmp, TK_M_WAITFOR, 0, value, NULL);
1390 continue;
1391 }
1392
1393 if (strcmp(key, "LABEL") == 0) {
1394 rule_tmp.rule.rule.label_off = add_string(rules, value);
1395 continue;
1396 }
1397
1398 if (strcmp(key, "GOTO") == 0) {
1399 rule_add_key(&rule_tmp, TK_A_GOTO, 0, value, NULL);
1400 continue;
1401 }
1402
1403 if (strncmp(key, "NAME", sizeof("NAME")-1) == 0) {
1404 if (op < OP_MATCH_MAX) {
1405 rule_add_key(&rule_tmp, TK_M_NAME, op, value, NULL);
1406 } else {
1407 if (value[0] == '\0')
1408 info(rules->udev, "name empty, node creation suppressed\n");
1409 rule_add_key(&rule_tmp, TK_A_NAME, op, value, NULL);
1410 attr = get_key_attribute(rules->udev, key + sizeof("NAME")-1);
1411 if (attr != NULL) {
1412 if (strstr(attr, "all_partitions") != NULL) {
1413 int num = DEFAULT_FAKE_PARTITIONS_COUNT;
1414
1415 dbg(rules->udev, "creation of partition nodes requested\n");
1416 rule_add_key(&rule_tmp, TK_A_NUM_FAKE_PART, 0, NULL, &num);
1417 }
1418 if (strstr(attr, "ignore_remove") != NULL) {
1419 dbg(rules->udev, "remove event should be ignored\n");
1420 rule_add_key(&rule_tmp, TK_A_IGNORE_REMOVE, 0, NULL, NULL);
1421 }
1422 }
1423 }
1424 rule_tmp.rule.rule.flags = 1;
1425 continue;
1426 }
1427
1428 if (strcmp(key, "SYMLINK") == 0) {
1429 if (op < OP_MATCH_MAX)
1430 rule_add_key(&rule_tmp, TK_M_DEVLINK, op, value, NULL);
1431 else
1432 rule_add_key(&rule_tmp, TK_A_DEVLINK, op, value, NULL);
1433 rule_tmp.rule.rule.flags = 1;
1434 continue;
1435 }
1436
1437 if (strcmp(key, "OWNER") == 0) {
1438 uid_t uid;
1439 char *endptr;
1440
1441 uid = strtoul(value, &endptr, 10);
1442 if (endptr[0] == '\0') {
1443 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1444 } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1445 uid = add_uid(rules, value);
1446 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1447 } else if (rules->resolve_names >= 0) {
1448 rule_add_key(&rule_tmp, TK_A_OWNER, op, value, NULL);
1449 }
1450 rule_tmp.rule.rule.flags = 1;
1451 continue;
1452 }
1453
1454 if (strcmp(key, "GROUP") == 0) {
1455 gid_t gid;
1456 char *endptr;
1457
1458 gid = strtoul(value, &endptr, 10);
1459 if (endptr[0] == '\0') {
1460 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1461 } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1462 gid = add_gid(rules, value);
1463 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1464 } else if (rules->resolve_names >= 0) {
1465 rule_add_key(&rule_tmp, TK_A_GROUP, op, value, NULL);
1466 }
1467 rule_tmp.rule.rule.flags = 1;
1468 continue;
1469 }
1470
1471 if (strcmp(key, "MODE") == 0) {
1472 mode_t mode;
1473 char *endptr;
1474
1475 mode = strtol(value, &endptr, 8);
1476 if (endptr[0] == '\0')
1477 rule_add_key(&rule_tmp, TK_A_MODE_ID, op, NULL, &mode);
1478 else
1479 rule_add_key(&rule_tmp, TK_A_MODE, op, value, NULL);
1480 rule_tmp.rule.rule.flags = 1;
1481 continue;
1482 }
1483
1484 if (strcmp(key, "OPTIONS") == 0) {
1485 const char *pos;
1486
1487 if (strstr(value, "last_rule") != NULL) {
1488 dbg(rules->udev, "last rule to be applied\n");
1489 rule_add_key(&rule_tmp, TK_A_LAST_RULE, 0, NULL, NULL);
1490 }
1491 if (strstr(value, "ignore_device") != NULL) {
1492 dbg(rules->udev, "device should be ignored\n");
1493 rule_add_key(&rule_tmp, TK_A_IGNORE_DEVICE, 0, NULL, NULL);
1494 }
1495 if (strstr(value, "ignore_remove") != NULL) {
1496 dbg(rules->udev, "remove event should be ignored\n");
1497 rule_add_key(&rule_tmp, TK_A_IGNORE_REMOVE, 0, NULL, NULL);
1498 }
1499 pos = strstr(value, "link_priority=");
1500 if (pos != NULL) {
1501 int prio = atoi(&pos[strlen("link_priority=")]);
1502
1503 rule_add_key(&rule_tmp, TK_A_DEVLINK_PRIO, 0, NULL, &prio);
1504 dbg(rules->udev, "link priority=%i\n", prio);
1505 }
1506 pos = strstr(value, "event_timeout=");
1507 if (pos != NULL) {
1508 int tout = atoi(&pos[strlen("event_timeout=")]);
1509
1510 rule_add_key(&rule_tmp, TK_A_EVENT_TIMEOUT, 0, NULL, &tout);
1511 dbg(rules->udev, "event timout=%i\n", tout);
1512 }
1513 pos = strstr(value, "string_escape=");
1514 if (pos != NULL) {
1515 pos = &pos[strlen("string_escape=")];
1516 if (strncmp(pos, "none", strlen("none")) == 0)
1517 rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_NONE, 0, NULL, NULL);
1518 else if (strncmp(pos, "replace", strlen("replace")) == 0)
1519 rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_REPLACE, 0, NULL, NULL);
1520 }
1521 if (strstr(value, "all_partitions") != NULL) {
1522 int num = DEFAULT_FAKE_PARTITIONS_COUNT;
1523
1524 rule_add_key(&rule_tmp, TK_A_NUM_FAKE_PART, 0, NULL, &num);
1525 dbg(rules->udev, "creation of partition nodes requested\n");
1526 }
1527 pos = strstr(value, "nowatch");
1528 if (pos != NULL) {
1529 const int off = 0;
1530
1531 rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, 0, NULL, &off);
1532 dbg(rules->udev, "inotify watch of device disabled\n");
1533 } else {
1534 pos = strstr(value, "watch");
1535 if (pos != NULL) {
1536 const int on = 1;
1537
1538 rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, 0, NULL, &on);
1539 dbg(rules->udev, "inotify watch of device requested\n");
1540 }
1541 }
1542 continue;
1543 }
1544 err(rules->udev, "unknown key '%s' in %s:%u\n", key, filename, lineno);
1545 }
1546
1547 /* add rule token */
1548 rule_tmp.rule.rule.token_count = 1 + rule_tmp.token_cur;
1549 if (add_token(rules, &rule_tmp.rule) != 0)
1550 goto invalid;
1551
1552 /* add tokens to list, sorted by type */
1553 if (sort_token(rules, &rule_tmp) != 0)
1554 goto invalid;
1555
1556 return 0;
1557 invalid:
1558 err(rules->udev, "invalid rule '%s:%u'\n", filename, lineno);
1559 return -1;
1560 }
1561
1562 static int parse_file(struct udev_rules *rules, const char *filename, unsigned short filename_off)
1563 {
1564 FILE *f;
1565 unsigned int first_token;
1566 char line[UTIL_LINE_SIZE];
1567 int line_nr = 0;
1568 unsigned int i;
1569
1570 info(rules->udev, "reading '%s' as rules file\n", filename);
1571
1572 f = fopen(filename, "r");
1573 if (f == NULL)
1574 return -1;
1575
1576 first_token = rules->token_cur;
1577
1578 while(fgets(line, sizeof(line), f) != NULL) {
1579 char *key;
1580 size_t len;
1581
1582 /* skip whitespace */
1583 line_nr++;
1584 key = line;
1585 while (isspace(key[0]))
1586 key++;
1587
1588 /* comment */
1589 if (key[0] == '#')
1590 continue;
1591
1592 len = strlen(line);
1593 if (len < 3)
1594 continue;
1595
1596 /* continue reading if backslash+newline is found */
1597 while (line[len-2] == '\\') {
1598 if (fgets(&line[len-2], (sizeof(line)-len)+2, f) == NULL)
1599 break;
1600 line_nr++;
1601 len = strlen(line);
1602 }
1603
1604 if (len+1 >= sizeof(line)) {
1605 err(rules->udev, "line too long '%s':%u, ignored\n", filename, line_nr);
1606 continue;
1607 }
1608 add_rule(rules, key, filename, filename_off, line_nr);
1609 }
1610 fclose(f);
1611
1612 /* link GOTOs to LABEL rules in this file to be able to fast-forward */
1613 for (i = first_token+1; i < rules->token_cur; i++) {
1614 if (rules->tokens[i].type == TK_A_GOTO) {
1615 char *label = &rules->buf[rules->tokens[i].key.value_off];
1616 unsigned int j;
1617
1618 for (j = i+1; j < rules->token_cur; j++) {
1619 if (rules->tokens[j].type != TK_RULE)
1620 continue;
1621 if (rules->tokens[j].rule.label_off == 0)
1622 continue;
1623 if (strcmp(label, &rules->buf[rules->tokens[j].rule.label_off]) != 0)
1624 continue;
1625 rules->tokens[i].key.rule_goto = j;
1626 break;
1627 }
1628 if (rules->tokens[i].key.rule_goto == 0)
1629 err(rules->udev, "GOTO '%s' has no matching label in: '%s'\n", label, filename);
1630 }
1631 }
1632 return 0;
1633 }
1634
1635 static int add_matching_files(struct udev *udev, struct udev_list_node *file_list, const char *dirname, const char *suffix)
1636 {
1637 DIR *dir;
1638 char filename[UTIL_PATH_SIZE];
1639
1640 dbg(udev, "open directory '%s'\n", dirname);
1641 dir = opendir(dirname);
1642 if (dir == NULL) {
1643 info(udev, "unable to open '%s': %m\n", dirname);
1644 return -1;
1645 }
1646
1647 while (1) {
1648 struct dirent *dent;
1649
1650 dent = readdir(dir);
1651 if (dent == NULL || dent->d_name[0] == '\0')
1652 break;
1653
1654 if (dent->d_name[0] == '.')
1655 continue;
1656
1657 /* look for file matching with specified suffix */
1658 if (suffix != NULL) {
1659 const char *ext;
1660
1661 ext = strrchr(dent->d_name, '.');
1662 if (ext == NULL)
1663 continue;
1664 if (strcmp(ext, suffix) != 0)
1665 continue;
1666 }
1667 util_strscpyl(filename, sizeof(filename), dirname, "/", dent->d_name, NULL);
1668 dbg(udev, "put file '%s' into list\n", filename);
1669 udev_list_entry_add(udev, file_list, filename, NULL, 1, 1);
1670 }
1671
1672 closedir(dir);
1673 return 0;
1674 }
1675
1676 struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
1677 {
1678 struct udev_rules *rules;
1679 struct stat statbuf;
1680 struct udev_list_node file_list;
1681 struct udev_list_entry *file_loop, *file_tmp;
1682 struct token end_token;
1683
1684 rules = malloc(sizeof(struct udev_rules));
1685 if (rules == NULL)
1686 return NULL;
1687 memset(rules, 0x00, sizeof(struct udev_rules));
1688 rules->udev = udev;
1689 rules->resolve_names = resolve_names;
1690 udev_list_init(&file_list);
1691
1692 /* init token array and string buffer */
1693 rules->tokens = malloc(PREALLOC_TOKEN * sizeof(struct token));
1694 if (rules->tokens == NULL)
1695 return NULL;
1696 rules->token_max = PREALLOC_TOKEN;
1697
1698 rules->buf = malloc(PREALLOC_STRBUF);
1699 if (rules->buf == NULL)
1700 return NULL;
1701 rules->buf_max = PREALLOC_STRBUF;
1702 /* offset 0 is always '\0' */
1703 rules->buf[0] = '\0';
1704 rules->buf_cur = 1;
1705 dbg(udev, "prealloc %zu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
1706 rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
1707
1708 rules->trie_nodes = malloc(PREALLOC_TRIE * sizeof(struct trie_node));
1709 if (rules->trie_nodes == NULL)
1710 return NULL;
1711 rules->trie_nodes_max = PREALLOC_TRIE;
1712 /* offset 0 is the trie root, with an empty string */
1713 memset(rules->trie_nodes, 0x00, sizeof(struct trie_node));
1714 rules->trie_nodes_cur = 1;
1715
1716 if (udev_get_rules_path(udev) != NULL) {
1717 /* custom rules location for testing */
1718 add_matching_files(udev, &file_list, udev_get_rules_path(udev), ".rules");
1719 } else {
1720 char filename[PATH_MAX];
1721 struct udev_list_node sort_list;
1722 struct udev_list_entry *sort_loop, *sort_tmp;
1723
1724 /* read user/custom rules */
1725 add_matching_files(udev, &file_list, SYSCONFDIR "/udev/rules.d", ".rules");
1726
1727 /* read dynamic/temporary rules */
1728 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.udev/rules.d", NULL);
1729 if (stat(filename, &statbuf) != 0) {
1730 util_create_path(udev, filename);
1731 udev_selinux_setfscreatecon(udev, filename, S_IFDIR|0755);
1732 mkdir(filename, 0755);
1733 udev_selinux_resetfscreatecon(udev);
1734 }
1735 udev_list_init(&sort_list);
1736 add_matching_files(udev, &sort_list, filename, ".rules");
1737
1738 /* read default rules */
1739 add_matching_files(udev, &sort_list, LIBEXECDIR "/rules.d", ".rules");
1740
1741 /* sort all rules files by basename into list of files */
1742 udev_list_entry_foreach_safe(sort_loop, sort_tmp, udev_list_get_entry(&sort_list)) {
1743 const char *sort_name = udev_list_entry_get_name(sort_loop);
1744 const char *sort_base = strrchr(sort_name, '/');
1745
1746 if (sort_base == NULL)
1747 continue;
1748 /* sort entry into existing list */
1749 udev_list_entry_foreach_safe(file_loop, file_tmp, udev_list_get_entry(&file_list)) {
1750 const char *file_name = udev_list_entry_get_name(file_loop);
1751 const char *file_base = strrchr(file_name, '/');
1752
1753 if (file_base == NULL)
1754 continue;
1755 if (strcmp(file_base, sort_base) == 0) {
1756 info(udev, "rule file basename '%s' already added, ignoring '%s'\n",
1757 file_name, sort_name);
1758 udev_list_entry_delete(sort_loop);
1759 sort_loop = NULL;
1760 break;
1761 }
1762 if (strcmp(file_base, sort_base) > 0) {
1763 /* found later file, insert before */
1764 udev_list_entry_remove(sort_loop);
1765 udev_list_entry_insert_before(sort_loop, file_loop);
1766 sort_loop = NULL;
1767 break;
1768 }
1769 }
1770 /* current file already handled */
1771 if (sort_loop == NULL)
1772 continue;
1773 /* no later file, append to end of list */
1774 udev_list_entry_remove(sort_loop);
1775 udev_list_entry_append(sort_loop, &file_list);
1776 }
1777 }
1778
1779 /* add all filenames to the string buffer */
1780 udev_list_entry_foreach(file_loop, udev_list_get_entry(&file_list)) {
1781 const char *filename = udev_list_entry_get_name(file_loop);
1782 unsigned int filename_off;
1783
1784 filename_off = add_string(rules, filename);
1785 /* the offset in the rule is limited to unsigned short */
1786 if (filename_off < USHRT_MAX)
1787 udev_list_entry_set_flag(file_loop, filename_off);
1788 }
1789
1790 /* parse list of files */
1791 udev_list_entry_foreach_safe(file_loop, file_tmp, udev_list_get_entry(&file_list)) {
1792 const char *filename = udev_list_entry_get_name(file_loop);
1793 unsigned int filename_off = udev_list_entry_get_flag(file_loop);
1794
1795 if (stat(filename, &statbuf) == 0 && statbuf.st_size > 0)
1796 parse_file(rules, filename, filename_off);
1797 else
1798 info(udev, "can not read '%s'\n", filename);
1799 udev_list_entry_delete(file_loop);
1800 }
1801
1802 memset(&end_token, 0x00, sizeof(struct token));
1803 end_token.type = TK_END;
1804 add_token(rules, &end_token);
1805
1806 /* shrink allocated token and string buffer */
1807 if (rules->token_cur < rules->token_max) {
1808 struct token *tokens;
1809
1810 tokens = realloc(rules->tokens, rules->token_cur * sizeof(struct token));
1811 if (tokens != NULL || rules->token_cur == 0) {
1812 rules->tokens = tokens;
1813 rules->token_max = rules->token_cur;
1814 }
1815 }
1816 if (rules->buf_cur < rules->buf_max) {
1817 char *buf;
1818
1819 buf = realloc(rules->buf, rules->buf_cur);
1820 if (buf != NULL || rules->buf_cur == 0) {
1821 rules->buf = buf;
1822 rules->buf_max = rules->buf_cur;
1823 }
1824 }
1825 info(udev, "rules use %zu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
1826 rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
1827 info(udev, "temporary index used %zu bytes (%u * %zu bytes)\n",
1828 rules->trie_nodes_cur * sizeof(struct trie_node),
1829 rules->trie_nodes_cur, sizeof(struct trie_node));
1830
1831 /* cleanup trie */
1832 free(rules->trie_nodes);
1833 rules->trie_nodes = NULL;
1834 rules->trie_nodes_cur = 0;
1835 rules->trie_nodes_max = 0;
1836
1837 /* cleanup uid/gid cache */
1838 free(rules->uids);
1839 rules->uids = NULL;
1840 rules->uids_cur = 0;
1841 rules->uids_max = 0;
1842 free(rules->gids);
1843 rules->gids = NULL;
1844 rules->gids_cur = 0;
1845 rules->gids_max = 0;
1846
1847 dump_rules(rules);
1848 return rules;
1849 }
1850
1851 void udev_rules_unref(struct udev_rules *rules)
1852 {
1853 if (rules == NULL)
1854 return;
1855 free(rules->tokens);
1856 free(rules->buf);
1857 free(rules->trie_nodes);
1858 free(rules->uids);
1859 free(rules->gids);
1860 free(rules);
1861 }
1862
1863 static int match_key(struct udev_rules *rules, struct token *token, const char *val)
1864 {
1865 char *key_value = &rules->buf[token->key.value_off];
1866 char *pos;
1867 int match = 0;
1868
1869 if (val == NULL)
1870 val = "";
1871
1872 switch (token->key.glob) {
1873 case GL_PLAIN:
1874 match = (strcmp(key_value, val) == 0);
1875 break;
1876 case GL_GLOB:
1877 match = (fnmatch(key_value, val, 0) == 0);
1878 break;
1879 case GL_SPLIT:
1880 {
1881 const char *split;
1882 size_t len;
1883
1884 split = &rules->buf[token->key.value_off];
1885 len = strlen(val);
1886 while (1) {
1887 const char *next;
1888
1889 next = strchr(split, '|');
1890 if (next != NULL) {
1891 size_t matchlen = (size_t)(next - split);
1892
1893 match = (matchlen == len && strncmp(split, val, matchlen) == 0);
1894 if (match)
1895 break;
1896 } else {
1897 match = (strcmp(split, val) == 0);
1898 break;
1899 }
1900 split = &next[1];
1901 }
1902 break;
1903 }
1904 case GL_SPLIT_GLOB:
1905 {
1906 char value[UTIL_PATH_SIZE];
1907
1908 util_strscpy(value, sizeof(value), &rules->buf[token->key.value_off]);
1909 key_value = value;
1910 while (key_value != NULL) {
1911 pos = strchr(key_value, '|');
1912 if (pos != NULL) {
1913 pos[0] = '\0';
1914 pos = &pos[1];
1915 }
1916 dbg(rules->udev, "match %s '%s' <-> '%s'\n", token_str(token->type), key_value, val);
1917 match = (fnmatch(key_value, val, 0) == 0);
1918 if (match)
1919 break;
1920 key_value = pos;
1921 }
1922 break;
1923 }
1924 case GL_SOMETHING:
1925 match = (val[0] != '\0');
1926 break;
1927 case GL_UNSET:
1928 return -1;
1929 }
1930
1931 if (match && (token->key.op == OP_MATCH)) {
1932 dbg(rules->udev, "%s is true (matching value)\n", token_str(token->type));
1933 return 0;
1934 }
1935 if (!match && (token->key.op == OP_NOMATCH)) {
1936 dbg(rules->udev, "%s is true (non-matching value)\n", token_str(token->type));
1937 return 0;
1938 }
1939 dbg(rules->udev, "%s is not true\n", token_str(token->type));
1940 return -1;
1941 }
1942
1943 static int match_attr(struct udev_rules *rules, struct udev_device *dev, struct udev_event *event, struct token *cur)
1944 {
1945 const char *name;
1946 char nbuf[UTIL_NAME_SIZE];
1947 const char *value;
1948 char vbuf[UTIL_NAME_SIZE];
1949 size_t len;
1950
1951 name = &rules->buf[cur->key.attr_off];
1952 switch (cur->key.attrsubst) {
1953 case SB_FORMAT:
1954 udev_event_apply_format(event, name, nbuf, sizeof(nbuf));
1955 name = nbuf;
1956 /* fall through */
1957 case SB_NONE:
1958 value = udev_device_get_sysattr_value(dev, name);
1959 if (value == NULL)
1960 return -1;
1961 break;
1962 case SB_SUBSYS:
1963 if (util_resolve_subsys_kernel(event->udev, name, vbuf, sizeof(vbuf), 1) != 0)
1964 return -1;
1965 value = vbuf;
1966 break;
1967 default:
1968 return -1;
1969 }
1970
1971 /* remove trailing whitespace, if not asked to match for it */
1972 len = strlen(value);
1973 if (len > 0 && isspace(value[len-1])) {
1974 const char *key_value;
1975 size_t klen;
1976
1977 key_value = &rules->buf[cur->key.value_off];
1978 klen = strlen(key_value);
1979 if (klen > 0 && !isspace(key_value[klen-1])) {
1980 if (value != vbuf) {
1981 util_strscpy(vbuf, sizeof(vbuf), value);
1982 value = vbuf;
1983 }
1984 while (len > 0 && isspace(vbuf[--len]))
1985 vbuf[len] = '\0';
1986 dbg(rules->udev, "removed trailing whitespace from '%s'\n", value);
1987 }
1988 }
1989
1990 return match_key(rules, cur, value);
1991 }
1992
1993 enum escape_type {
1994 ESCAPE_UNSET,
1995 ESCAPE_NONE,
1996 ESCAPE_REPLACE,
1997 };
1998
1999 int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event)
2000 {
2001 struct token *cur;
2002 struct token *rule;
2003 enum escape_type esc = ESCAPE_UNSET;
2004 int can_set_name;
2005
2006 if (rules->tokens == NULL)
2007 return -1;
2008
2009 can_set_name = ((strcmp(udev_device_get_action(event->dev), "add") == 0 ||
2010 strcmp(udev_device_get_action(event->dev), "change") == 0) &&
2011 (major(udev_device_get_devnum(event->dev)) > 0 ||
2012 strcmp(udev_device_get_subsystem(event->dev), "net") == 0));
2013
2014 /* loop through token list, match, run actions or forward to next rule */
2015 cur = &rules->tokens[0];
2016 rule = cur;
2017 while (1) {
2018 dump_token(rules, cur);
2019 switch (cur->type) {
2020 case TK_RULE:
2021 /* current rule */
2022 rule = cur;
2023 /* possibly skip rules which want to set NAME, SYMLINK, OWNER, GROUP, MODE */
2024 if (!can_set_name && rule->rule.flags)
2025 goto nomatch;
2026 esc = ESCAPE_UNSET;
2027 break;
2028 case TK_M_ACTION:
2029 if (match_key(rules, cur, udev_device_get_action(event->dev)) != 0)
2030 goto nomatch;
2031 break;
2032 case TK_M_DEVPATH:
2033 if (match_key(rules, cur, udev_device_get_devpath(event->dev)) != 0)
2034 goto nomatch;
2035 break;
2036 case TK_M_KERNEL:
2037 if (match_key(rules, cur, udev_device_get_sysname(event->dev)) != 0)
2038 goto nomatch;
2039 break;
2040 case TK_M_DEVLINK:
2041 {
2042 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
2043 struct udev_list_entry *list_entry;
2044 int match = 0;
2045
2046 udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(event->dev)) {
2047 const char *devlink;
2048
2049 devlink = &udev_list_entry_get_name(list_entry)[devlen];
2050 if (match_key(rules, cur, devlink) == 0) {
2051 match = 1;
2052 break;
2053 }
2054 }
2055 if (!match)
2056 goto nomatch;
2057 break;
2058 }
2059 case TK_M_NAME:
2060 if (match_key(rules, cur, event->name) != 0)
2061 goto nomatch;
2062 break;
2063 case TK_M_ENV:
2064 {
2065 const char *key_name = &rules->buf[cur->key.attr_off];
2066 const char *value;
2067
2068 value = udev_device_get_property_value(event->dev, key_name);
2069 if (value == NULL) {
2070 dbg(event->udev, "ENV{%s} is not set, treat as empty\n", key_name);
2071 value = "";
2072 }
2073 if (match_key(rules, cur, value))
2074 goto nomatch;
2075 break;
2076 }
2077 case TK_M_SUBSYSTEM:
2078 if (match_key(rules, cur, udev_device_get_subsystem(event->dev)) != 0)
2079 goto nomatch;
2080 break;
2081 case TK_M_DRIVER:
2082 if (match_key(rules, cur, udev_device_get_driver(event->dev)) != 0)
2083 goto nomatch;
2084 break;
2085 case TK_M_WAITFOR:
2086 {
2087 char filename[UTIL_PATH_SIZE];
2088 int found;
2089
2090 udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2091 found = (wait_for_file(event->dev, filename, 10) == 0);
2092 if (!found && (cur->key.op != OP_NOMATCH))
2093 goto nomatch;
2094 break;
2095 }
2096 case TK_M_ATTR:
2097 if (match_attr(rules, event->dev, event, cur) != 0)
2098 goto nomatch;
2099 break;
2100 case TK_M_KERNELS:
2101 case TK_M_SUBSYSTEMS:
2102 case TK_M_DRIVERS:
2103 case TK_M_ATTRS:
2104 {
2105 struct token *next;
2106
2107 /* get whole sequence of parent matches */
2108 next = cur;
2109 while (next->type > TK_M_PARENTS_MIN && next->type < TK_M_PARENTS_MAX)
2110 next++;
2111
2112 /* loop over parents */
2113 event->dev_parent = event->dev;
2114 while (1) {
2115 struct token *key;
2116
2117 dbg(event->udev, "parent: '%s'\n", udev_device_get_syspath(event->dev_parent));
2118 /* loop over sequence of parent match keys */
2119 for (key = cur; key < next; key++ ) {
2120 dump_token(rules, key);
2121 switch(key->type) {
2122 case TK_M_KERNELS:
2123 if (match_key(rules, key, udev_device_get_sysname(event->dev_parent)) != 0)
2124 goto try_parent;
2125 break;
2126 case TK_M_SUBSYSTEMS:
2127 if (match_key(rules, key, udev_device_get_subsystem(event->dev_parent)) != 0)
2128 goto try_parent;
2129 break;
2130 case TK_M_DRIVERS:
2131 if (match_key(rules, key, udev_device_get_driver(event->dev_parent)) != 0)
2132 goto try_parent;
2133 break;
2134 case TK_M_ATTRS:
2135 if (match_attr(rules, event->dev_parent, event, key) != 0)
2136 goto try_parent;
2137 break;
2138 default:
2139 goto nomatch;
2140 }
2141 dbg(event->udev, "parent key matched\n");
2142 }
2143 dbg(event->udev, "all parent keys matched\n");
2144 /* all keys matched */
2145 break;
2146
2147 try_parent:
2148 event->dev_parent = udev_device_get_parent(event->dev_parent);
2149 if (event->dev_parent == NULL)
2150 goto nomatch;
2151 }
2152 /* move behind our sequence of parent match keys */
2153 cur = next;
2154 continue;
2155 }
2156 case TK_M_TEST:
2157 {
2158 char filename[UTIL_PATH_SIZE];
2159 struct stat statbuf;
2160 int match;
2161
2162 udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2163 if (util_resolve_subsys_kernel(event->udev, filename, filename, sizeof(filename), 0) != 0) {
2164 if (filename[0] != '/') {
2165 char tmp[UTIL_PATH_SIZE];
2166
2167 util_strscpy(tmp, sizeof(tmp), filename);
2168 util_strscpyl(filename, sizeof(filename),
2169 udev_device_get_syspath(event->dev), "/", tmp, NULL);
2170 }
2171 }
2172 attr_subst_subdir(filename, sizeof(filename));
2173
2174 match = (stat(filename, &statbuf) == 0);
2175 dbg(event->udev, "'%s' %s", filename, match ? "exists\n" : "does not exist\n");
2176 if (match && cur->key.mode > 0) {
2177 match = ((statbuf.st_mode & cur->key.mode) > 0);
2178 dbg(event->udev, "'%s' has mode=%#o and %s %#o\n", filename, statbuf.st_mode,
2179 match ? "matches" : "does not match", cur->key.mode);
2180 }
2181 if (match && cur->key.op == OP_NOMATCH)
2182 goto nomatch;
2183 if (!match && cur->key.op == OP_MATCH)
2184 goto nomatch;
2185 break;
2186 }
2187 case TK_M_PROGRAM:
2188 {
2189 char program[UTIL_PATH_SIZE];
2190 char **envp;
2191 char result[UTIL_PATH_SIZE];
2192
2193 free(event->program_result);
2194 event->program_result = NULL;
2195 udev_event_apply_format(event, &rules->buf[cur->key.value_off], program, sizeof(program));
2196 envp = udev_device_get_properties_envp(event->dev);
2197 info(event->udev, "PROGRAM '%s' %s:%u\n",
2198 program,
2199 &rules->buf[rule->rule.filename_off],
2200 rule->rule.filename_line);
2201 if (util_run_program(event->udev, program, envp, result, sizeof(result), NULL) != 0) {
2202 if (cur->key.op != OP_NOMATCH)
2203 goto nomatch;
2204 } else {
2205 int count;
2206
2207 util_remove_trailing_chars(result, '\n');
2208 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2209 count = udev_util_replace_chars(result, UDEV_ALLOWED_CHARS_INPUT);
2210 if (count > 0)
2211 info(event->udev, "%i character(s) replaced\n" , count);
2212 }
2213 event->program_result = strdup(result);
2214 dbg(event->udev, "storing result '%s'\n", event->program_result);
2215 if (cur->key.op == OP_NOMATCH)
2216 goto nomatch;
2217 }
2218 break;
2219 }
2220 case TK_M_IMPORT_FILE:
2221 {
2222 char import[UTIL_PATH_SIZE];
2223
2224 udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2225 if (import_file_into_properties(event->dev, import) != 0)
2226 if (cur->key.op != OP_NOMATCH)
2227 goto nomatch;
2228 break;
2229 }
2230 case TK_M_IMPORT_PROG:
2231 {
2232 char import[UTIL_PATH_SIZE];
2233
2234 udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2235 info(event->udev, "IMPORT '%s' %s:%u\n",
2236 import,
2237 &rules->buf[rule->rule.filename_off],
2238 rule->rule.filename_line);
2239 if (import_program_into_properties(event->dev, import) != 0)
2240 if (cur->key.op != OP_NOMATCH)
2241 goto nomatch;
2242 break;
2243 }
2244 case TK_M_IMPORT_PARENT:
2245 {
2246 char import[UTIL_PATH_SIZE];
2247
2248 udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2249 if (import_parent_into_properties(event->dev, import) != 0)
2250 if (cur->key.op != OP_NOMATCH)
2251 goto nomatch;
2252 break;
2253 }
2254 case TK_M_RESULT:
2255 if (match_key(rules, cur, event->program_result) != 0)
2256 goto nomatch;
2257 break;
2258
2259 case TK_A_IGNORE_DEVICE:
2260 event->ignore_device = 1;
2261 return 0;
2262 break;
2263 case TK_A_STRING_ESCAPE_NONE:
2264 esc = ESCAPE_NONE;
2265 break;
2266 case TK_A_STRING_ESCAPE_REPLACE:
2267 esc = ESCAPE_REPLACE;
2268 break;
2269 case TK_A_NUM_FAKE_PART:
2270 if (strcmp(udev_device_get_subsystem(event->dev), "block") != 0)
2271 break;
2272 if (udev_device_get_sysnum(event->dev) != NULL)
2273 break;
2274 udev_device_set_num_fake_partitions(event->dev, cur->key.num_fake_part);
2275 break;
2276 case TK_A_INOTIFY_WATCH:
2277 event->inotify_watch = cur->key.watch;
2278 break;
2279 case TK_A_DEVLINK_PRIO:
2280 udev_device_set_devlink_priority(event->dev, cur->key.devlink_prio);
2281 break;
2282 case TK_A_OWNER:
2283 {
2284 char owner[UTIL_NAME_SIZE];
2285
2286 if (event->owner_final)
2287 break;
2288 if (cur->key.op == OP_ASSIGN_FINAL)
2289 event->owner_final = 1;
2290 udev_event_apply_format(event, &rules->buf[cur->key.value_off], owner, sizeof(owner));
2291 event->uid = util_lookup_user(event->udev, owner);
2292 info(event->udev, "OWNER %u %s:%u\n",
2293 event->uid,
2294 &rules->buf[rule->rule.filename_off],
2295 rule->rule.filename_line);
2296 break;
2297 }
2298 case TK_A_GROUP:
2299 {
2300 char group[UTIL_NAME_SIZE];
2301
2302 if (event->group_final)
2303 break;
2304 if (cur->key.op == OP_ASSIGN_FINAL)
2305 event->group_final = 1;
2306 udev_event_apply_format(event, &rules->buf[cur->key.value_off], group, sizeof(group));
2307 event->gid = util_lookup_group(event->udev, group);
2308 info(event->udev, "GROUP %u %s:%u\n",
2309 event->gid,
2310 &rules->buf[rule->rule.filename_off],
2311 rule->rule.filename_line);
2312 break;
2313 }
2314 case TK_A_MODE:
2315 {
2316 char mode[UTIL_NAME_SIZE];
2317 char *endptr;
2318
2319 if (event->mode_final)
2320 break;
2321 if (cur->key.op == OP_ASSIGN_FINAL)
2322 event->mode_final = 1;
2323 udev_event_apply_format(event, &rules->buf[cur->key.value_off], mode, sizeof(mode));
2324 event->mode = strtol(mode, &endptr, 8);
2325 if (endptr[0] != '\0') {
2326 err(event->udev, "invalide mode '%s' set default mode 0660\n", mode);
2327 event->mode = 0660;
2328 }
2329 info(event->udev, "MODE %#o %s:%u\n",
2330 event->mode,
2331 &rules->buf[rule->rule.filename_off],
2332 rule->rule.filename_line);
2333 break;
2334 }
2335 case TK_A_OWNER_ID:
2336 if (event->owner_final)
2337 break;
2338 if (cur->key.op == OP_ASSIGN_FINAL)
2339 event->owner_final = 1;
2340 event->uid = cur->key.uid;
2341 info(event->udev, "OWNER %u %s:%u\n",
2342 event->uid,
2343 &rules->buf[rule->rule.filename_off],
2344 rule->rule.filename_line);
2345 break;
2346 case TK_A_GROUP_ID:
2347 if (event->group_final)
2348 break;
2349 if (cur->key.op == OP_ASSIGN_FINAL)
2350 event->group_final = 1;
2351 event->gid = cur->key.gid;
2352 info(event->udev, "GROUP %u %s:%u\n",
2353 event->gid,
2354 &rules->buf[rule->rule.filename_off],
2355 rule->rule.filename_line);
2356 break;
2357 case TK_A_MODE_ID:
2358 if (event->mode_final)
2359 break;
2360 if (cur->key.op == OP_ASSIGN_FINAL)
2361 event->mode_final = 1;
2362 event->mode = cur->key.mode;
2363 info(event->udev, "MODE %#o %s:%u\n",
2364 event->mode,
2365 &rules->buf[rule->rule.filename_off],
2366 rule->rule.filename_line);
2367 break;
2368 case TK_A_ENV:
2369 {
2370 const char *name = &rules->buf[cur->key.attr_off];
2371 char *value = &rules->buf[cur->key.value_off];
2372
2373 if (value[0] != '\0') {
2374 char temp_value[UTIL_NAME_SIZE];
2375 struct udev_list_entry *entry;
2376
2377 udev_event_apply_format(event, value, temp_value, sizeof(temp_value));
2378 entry = udev_device_add_property(event->dev, name, temp_value);
2379 /* store in db, skip private keys */
2380 if (name[0] != '.')
2381 udev_list_entry_set_flag(entry, 1);
2382 } else {
2383 udev_device_add_property(event->dev, name, NULL);
2384 }
2385 break;
2386 }
2387 case TK_A_NAME:
2388 {
2389 const char *name = &rules->buf[cur->key.value_off];
2390 char name_str[UTIL_PATH_SIZE];
2391 int count;
2392
2393 if (event->name_final)
2394 break;
2395 if (cur->key.op == OP_ASSIGN_FINAL)
2396 event->name_final = 1;
2397 udev_event_apply_format(event, name, name_str, sizeof(name_str));
2398 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2399 count = udev_util_replace_chars(name_str, "/");
2400 if (count > 0)
2401 info(event->udev, "%i character(s) replaced\n", count);
2402 }
2403 free(event->name);
2404 event->name = strdup(name_str);
2405 info(event->udev, "NAME '%s' %s:%u\n",
2406 event->name,
2407 &rules->buf[rule->rule.filename_off],
2408 rule->rule.filename_line);
2409 break;
2410 }
2411 case TK_A_DEVLINK:
2412 {
2413 char temp[UTIL_PATH_SIZE];
2414 char filename[UTIL_PATH_SIZE];
2415 char *pos, *next;
2416 int count = 0;
2417
2418 if (event->devlink_final)
2419 break;
2420 if (major(udev_device_get_devnum(event->dev)) == 0)
2421 break;
2422 if (cur->key.op == OP_ASSIGN_FINAL)
2423 event->devlink_final = 1;
2424 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2425 udev_device_cleanup_devlinks_list(event->dev);
2426
2427 /* allow multiple symlinks separated by spaces */
2428 udev_event_apply_format(event, &rules->buf[cur->key.value_off], temp, sizeof(temp));
2429 if (esc == ESCAPE_UNSET)
2430 count = udev_util_replace_chars(temp, "/ ");
2431 else if (esc == ESCAPE_REPLACE)
2432 count = udev_util_replace_chars(temp, "/");
2433 if (count > 0)
2434 info(event->udev, "%i character(s) replaced\n" , count);
2435 dbg(event->udev, "rule applied, added symlink(s) '%s'\n", temp);
2436 pos = temp;
2437 while (isspace(pos[0]))
2438 pos++;
2439 next = strchr(pos, ' ');
2440 while (next) {
2441 next[0] = '\0';
2442 info(event->udev, "LINK '%s' %s:%u\n",
2443 pos,
2444 &rules->buf[rule->rule.filename_off],
2445 rule->rule.filename_line);
2446 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", pos, NULL);
2447 udev_device_add_devlink(event->dev, filename);
2448 while (isspace(next[1]))
2449 next++;
2450 pos = &next[1];
2451 next = strchr(pos, ' ');
2452 }
2453 if (pos[0] != '\0') {
2454 info(event->udev, "LINK '%s' %s:%u\n",
2455 pos,
2456 &rules->buf[rule->rule.filename_off],
2457 rule->rule.filename_line);
2458 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", pos, NULL);
2459 udev_device_add_devlink(event->dev, filename);
2460 }
2461 }
2462 break;
2463 case TK_A_EVENT_TIMEOUT:
2464 udev_device_set_event_timeout(event->dev, cur->key.event_timeout);
2465 break;
2466 case TK_A_IGNORE_REMOVE:
2467 udev_device_set_ignore_remove(event->dev, 1);
2468 break;
2469 case TK_A_ATTR:
2470 {
2471 const char *key_name = &rules->buf[cur->key.attr_off];
2472 char attr[UTIL_PATH_SIZE];
2473 char value[UTIL_NAME_SIZE];
2474 FILE *f;
2475
2476 if (util_resolve_subsys_kernel(event->udev, key_name, attr, sizeof(attr), 0) != 0)
2477 util_strscpyl(attr, sizeof(attr), udev_device_get_syspath(event->dev), "/", key_name, NULL);
2478 attr_subst_subdir(attr, sizeof(attr));
2479
2480 udev_event_apply_format(event, &rules->buf[cur->key.value_off], value, sizeof(value));
2481 info(event->udev, "ATTR '%s' writing '%s' %s:%u\n", attr, value,
2482 &rules->buf[rule->rule.filename_off],
2483 rule->rule.filename_line);
2484 f = fopen(attr, "w");
2485 if (f != NULL) {
2486 if (fprintf(f, "%s", value) <= 0)
2487 err(event->udev, "error writing ATTR{%s}: %m\n", attr);
2488 fclose(f);
2489 } else {
2490 err(event->udev, "error opening ATTR{%s} for writing: %m\n", attr);
2491 }
2492 break;
2493 }
2494 case TK_A_RUN:
2495 {
2496 struct udev_list_entry *list_entry;
2497
2498 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2499 udev_list_cleanup_entries(event->udev, &event->run_list);
2500 info(event->udev, "RUN '%s' %s:%u\n",
2501 &rules->buf[cur->key.value_off],
2502 &rules->buf[rule->rule.filename_off],
2503 rule->rule.filename_line);
2504 list_entry = udev_list_entry_add(event->udev, &event->run_list,
2505 &rules->buf[cur->key.value_off], NULL, 1, 0);
2506 if (cur->key.ignore_error)
2507 udev_list_entry_set_flag(list_entry, 1);
2508 break;
2509 }
2510 case TK_A_GOTO:
2511 if (cur->key.rule_goto == 0)
2512 break;
2513 cur = &rules->tokens[cur->key.rule_goto];
2514 continue;
2515 case TK_A_LAST_RULE:
2516 case TK_END:
2517 return 0;
2518
2519 case TK_M_PARENTS_MIN:
2520 case TK_M_PARENTS_MAX:
2521 case TK_M_MAX:
2522 case TK_UNSET:
2523 err(rules->udev, "wrong type %u\n", cur->type);
2524 goto nomatch;
2525 }
2526
2527 cur++;
2528 continue;
2529 nomatch:
2530 /* fast-forward to next rule */
2531 cur = rule + rule->rule.token_count;
2532 dbg(rules->udev, "forward to rule: %u\n",
2533 (unsigned int) (cur - rules->tokens));
2534 }
2535 }
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