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[thirdparty/systemd.git] / src / udev / udev-rules.c
1 /*
2 * Copyright (C) 2003-2012 Kay Sievers <kay@vrfy.org>
3 *
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
16 */
17
18 #include <stddef.h>
19 #include <limits.h>
20 #include <stdlib.h>
21 #include <stdbool.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 #include <time.h>
31
32 #include "udev.h"
33 #include "path-util.h"
34 #include "conf-files.h"
35 #include "strbuf.h"
36
37 #define PREALLOC_TOKEN 2048
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 udev_rules {
48 struct udev *udev;
49 char **dirs;
50 usec_t *dirs_ts_usec;
51 int resolve_names;
52
53 /* every key in the rules file becomes a token */
54 struct token *tokens;
55 unsigned int token_cur;
56 unsigned int token_max;
57
58 /* all key strings are copied and de-duplicated in a single continous string buffer */
59 struct strbuf *strbuf;
60
61 /* during rule parsing, uid/gid lookup results are cached */
62 struct uid_gid *uids;
63 unsigned int uids_cur;
64 unsigned int uids_max;
65 struct uid_gid *gids;
66 unsigned int gids_cur;
67 unsigned int gids_max;
68 };
69
70 static char *rules_str(struct udev_rules *rules, unsigned int off) {
71 return rules->strbuf->buf + off;
72 }
73
74 static unsigned int rules_add_string(struct udev_rules *rules, const char *s) {
75 return strbuf_add_string(rules->strbuf, s, strlen(s));
76 }
77
78 /* KEY=="", KEY!="", KEY+="", KEY="", KEY:="" */
79 enum operation_type {
80 OP_UNSET,
81
82 OP_MATCH,
83 OP_NOMATCH,
84 OP_MATCH_MAX,
85
86 OP_ADD,
87 OP_ASSIGN,
88 OP_ASSIGN_FINAL,
89 };
90
91 enum string_glob_type {
92 GL_UNSET,
93 GL_PLAIN, /* no special chars */
94 GL_GLOB, /* shell globs ?,*,[] */
95 GL_SPLIT, /* multi-value A|B */
96 GL_SPLIT_GLOB, /* multi-value with glob A*|B* */
97 GL_SOMETHING, /* commonly used "?*" */
98 };
99
100 enum string_subst_type {
101 SB_UNSET,
102 SB_NONE,
103 SB_FORMAT,
104 SB_SUBSYS,
105 };
106
107 /* tokens of a rule are sorted/handled in this order */
108 enum token_type {
109 TK_UNSET,
110 TK_RULE,
111
112 TK_M_ACTION, /* val */
113 TK_M_DEVPATH, /* val */
114 TK_M_KERNEL, /* val */
115 TK_M_DEVLINK, /* val */
116 TK_M_NAME, /* val */
117 TK_M_ENV, /* val, attr */
118 TK_M_TAG, /* val */
119 TK_M_SUBSYSTEM, /* val */
120 TK_M_DRIVER, /* val */
121 TK_M_WAITFOR, /* val */
122 TK_M_ATTR, /* val, attr */
123
124 TK_M_PARENTS_MIN,
125 TK_M_KERNELS, /* val */
126 TK_M_SUBSYSTEMS, /* val */
127 TK_M_DRIVERS, /* val */
128 TK_M_ATTRS, /* val, attr */
129 TK_M_TAGS, /* val */
130 TK_M_PARENTS_MAX,
131
132 TK_M_TEST, /* val, mode_t */
133 TK_M_EVENT_TIMEOUT, /* int */
134 TK_M_PROGRAM, /* val */
135 TK_M_IMPORT_FILE, /* val */
136 TK_M_IMPORT_PROG, /* val */
137 TK_M_IMPORT_BUILTIN, /* val */
138 TK_M_IMPORT_DB, /* val */
139 TK_M_IMPORT_CMDLINE, /* val */
140 TK_M_IMPORT_PARENT, /* val */
141 TK_M_RESULT, /* val */
142 TK_M_MAX,
143
144 TK_A_STRING_ESCAPE_NONE,
145 TK_A_STRING_ESCAPE_REPLACE,
146 TK_A_DB_PERSIST,
147 TK_A_INOTIFY_WATCH, /* int */
148 TK_A_DEVLINK_PRIO, /* int */
149 TK_A_OWNER, /* val */
150 TK_A_GROUP, /* val */
151 TK_A_MODE, /* val */
152 TK_A_OWNER_ID, /* uid_t */
153 TK_A_GROUP_ID, /* gid_t */
154 TK_A_MODE_ID, /* mode_t */
155 TK_A_STATIC_NODE, /* val */
156 TK_A_ENV, /* val, attr */
157 TK_A_TAG, /* val */
158 TK_A_NAME, /* val */
159 TK_A_DEVLINK, /* val */
160 TK_A_ATTR, /* val, attr */
161 TK_A_RUN_BUILTIN, /* val, bool */
162 TK_A_RUN_PROGRAM, /* val, bool */
163 TK_A_GOTO, /* size_t */
164
165 TK_END,
166 };
167
168 /* we try to pack stuff in a way that we take only 12 bytes per token */
169 struct token {
170 union {
171 unsigned char type; /* same in rule and key */
172 struct {
173 enum token_type type:8;
174 bool can_set_name:1;
175 bool has_static_node:1;
176 unsigned int unused:6;
177 unsigned short token_count;
178 unsigned int label_off;
179 unsigned short filename_off;
180 unsigned short filename_line;
181 } rule;
182 struct {
183 enum token_type type:8;
184 enum operation_type op:8;
185 enum string_glob_type glob:8;
186 enum string_subst_type subst:4;
187 enum string_subst_type attrsubst:4;
188 unsigned int value_off;
189 union {
190 unsigned int attr_off;
191 unsigned int rule_goto;
192 mode_t mode;
193 uid_t uid;
194 gid_t gid;
195 int devlink_prio;
196 int event_timeout;
197 int watch;
198 enum udev_builtin_cmd builtin_cmd;
199 };
200 } key;
201 };
202 };
203
204 #define MAX_TK 64
205 struct rule_tmp {
206 struct udev_rules *rules;
207 struct token rule;
208 struct token token[MAX_TK];
209 unsigned int token_cur;
210 };
211
212 #ifdef DEBUG
213 static const char *operation_str(enum operation_type type)
214 {
215 static const char *operation_strs[] = {
216 [OP_UNSET] = "UNSET",
217 [OP_MATCH] = "match",
218 [OP_NOMATCH] = "nomatch",
219 [OP_MATCH_MAX] = "MATCH_MAX",
220
221 [OP_ADD] = "add",
222 [OP_ASSIGN] = "assign",
223 [OP_ASSIGN_FINAL] = "assign-final",
224 } ;
225
226 return operation_strs[type];
227 }
228
229 static const char *string_glob_str(enum string_glob_type type)
230 {
231 static const char *string_glob_strs[] = {
232 [GL_UNSET] = "UNSET",
233 [GL_PLAIN] = "plain",
234 [GL_GLOB] = "glob",
235 [GL_SPLIT] = "split",
236 [GL_SPLIT_GLOB] = "split-glob",
237 [GL_SOMETHING] = "split-glob",
238 };
239
240 return string_glob_strs[type];
241 }
242
243 static const char *token_str(enum token_type type)
244 {
245 static const char *token_strs[] = {
246 [TK_UNSET] = "UNSET",
247 [TK_RULE] = "RULE",
248
249 [TK_M_ACTION] = "M ACTION",
250 [TK_M_DEVPATH] = "M DEVPATH",
251 [TK_M_KERNEL] = "M KERNEL",
252 [TK_M_DEVLINK] = "M DEVLINK",
253 [TK_M_NAME] = "M NAME",
254 [TK_M_ENV] = "M ENV",
255 [TK_M_TAG] = "M TAG",
256 [TK_M_SUBSYSTEM] = "M SUBSYSTEM",
257 [TK_M_DRIVER] = "M DRIVER",
258 [TK_M_WAITFOR] = "M WAITFOR",
259 [TK_M_ATTR] = "M ATTR",
260
261 [TK_M_PARENTS_MIN] = "M PARENTS_MIN",
262 [TK_M_KERNELS] = "M KERNELS",
263 [TK_M_SUBSYSTEMS] = "M SUBSYSTEMS",
264 [TK_M_DRIVERS] = "M DRIVERS",
265 [TK_M_ATTRS] = "M ATTRS",
266 [TK_M_TAGS] = "M TAGS",
267 [TK_M_PARENTS_MAX] = "M PARENTS_MAX",
268
269 [TK_M_TEST] = "M TEST",
270 [TK_M_EVENT_TIMEOUT] = "M EVENT_TIMEOUT",
271 [TK_M_PROGRAM] = "M PROGRAM",
272 [TK_M_IMPORT_FILE] = "M IMPORT_FILE",
273 [TK_M_IMPORT_PROG] = "M IMPORT_PROG",
274 [TK_M_IMPORT_BUILTIN] = "M IMPORT_BUILTIN",
275 [TK_M_IMPORT_DB] = "M IMPORT_DB",
276 [TK_M_IMPORT_CMDLINE] = "M IMPORT_CMDLINE",
277 [TK_M_IMPORT_PARENT] = "M IMPORT_PARENT",
278 [TK_M_RESULT] = "M RESULT",
279 [TK_M_MAX] = "M MAX",
280
281 [TK_A_STRING_ESCAPE_NONE] = "A STRING_ESCAPE_NONE",
282 [TK_A_STRING_ESCAPE_REPLACE] = "A STRING_ESCAPE_REPLACE",
283 [TK_A_DB_PERSIST] = "A DB_PERSIST",
284 [TK_A_INOTIFY_WATCH] = "A INOTIFY_WATCH",
285 [TK_A_DEVLINK_PRIO] = "A DEVLINK_PRIO",
286 [TK_A_OWNER] = "A OWNER",
287 [TK_A_GROUP] = "A GROUP",
288 [TK_A_MODE] = "A MODE",
289 [TK_A_OWNER_ID] = "A OWNER_ID",
290 [TK_A_GROUP_ID] = "A GROUP_ID",
291 [TK_A_STATIC_NODE] = "A STATIC_NODE",
292 [TK_A_MODE_ID] = "A MODE_ID",
293 [TK_A_ENV] = "A ENV",
294 [TK_A_TAG] = "A ENV",
295 [TK_A_NAME] = "A NAME",
296 [TK_A_DEVLINK] = "A DEVLINK",
297 [TK_A_ATTR] = "A ATTR",
298 [TK_A_RUN_BUILTIN] = "A RUN_BUILTIN",
299 [TK_A_RUN_PROGRAM] = "A RUN_PROGRAM",
300 [TK_A_GOTO] = "A GOTO",
301
302 [TK_END] = "END",
303 };
304
305 return token_strs[type];
306 }
307
308 static void dump_token(struct udev_rules *rules, struct token *token)
309 {
310 enum token_type type = token->type;
311 enum operation_type op = token->key.op;
312 enum string_glob_type glob = token->key.glob;
313 const char *value = str(rules, token->key.value_off);
314 const char *attr = &rules->buf[token->key.attr_off];
315
316 switch (type) {
317 case TK_RULE:
318 {
319 const char *tks_ptr = (char *)rules->tokens;
320 const char *tk_ptr = (char *)token;
321 unsigned int idx = (tk_ptr - tks_ptr) / sizeof(struct token);
322
323 log_debug("* RULE %s:%u, token: %u, count: %u, label: '%s'\n",
324 &rules->buf[token->rule.filename_off], token->rule.filename_line,
325 idx, token->rule.token_count,
326 &rules->buf[token->rule.label_off]);
327 break;
328 }
329 case TK_M_ACTION:
330 case TK_M_DEVPATH:
331 case TK_M_KERNEL:
332 case TK_M_SUBSYSTEM:
333 case TK_M_DRIVER:
334 case TK_M_WAITFOR:
335 case TK_M_DEVLINK:
336 case TK_M_NAME:
337 case TK_M_KERNELS:
338 case TK_M_SUBSYSTEMS:
339 case TK_M_DRIVERS:
340 case TK_M_TAGS:
341 case TK_M_PROGRAM:
342 case TK_M_IMPORT_FILE:
343 case TK_M_IMPORT_PROG:
344 case TK_M_IMPORT_DB:
345 case TK_M_IMPORT_CMDLINE:
346 case TK_M_IMPORT_PARENT:
347 case TK_M_RESULT:
348 case TK_A_NAME:
349 case TK_A_DEVLINK:
350 case TK_A_OWNER:
351 case TK_A_GROUP:
352 case TK_A_MODE:
353 case TK_A_RUN_BUILTIN:
354 case TK_A_RUN_PROGRAM:
355 log_debug("%s %s '%s'(%s)\n",
356 token_str(type), operation_str(op), value, string_glob_str(glob));
357 break;
358 case TK_M_IMPORT_BUILTIN:
359 log_debug("%s %i '%s'\n", token_str(type), token->key.builtin_cmd, value);
360 break;
361 case TK_M_ATTR:
362 case TK_M_ATTRS:
363 case TK_M_ENV:
364 case TK_A_ATTR:
365 case TK_A_ENV:
366 log_debug("%s %s '%s' '%s'(%s)\n",
367 token_str(type), operation_str(op), attr, value, string_glob_str(glob));
368 break;
369 case TK_M_TAG:
370 case TK_A_TAG:
371 log_debug("%s %s '%s'\n", token_str(type), operation_str(op), value);
372 break;
373 case TK_A_STRING_ESCAPE_NONE:
374 case TK_A_STRING_ESCAPE_REPLACE:
375 case TK_A_DB_PERSIST:
376 log_debug("%s\n", token_str(type));
377 break;
378 case TK_M_TEST:
379 log_debug("%s %s '%s'(%s) %#o\n",
380 token_str(type), operation_str(op), value, string_glob_str(glob), token->key.mode);
381 break;
382 case TK_A_INOTIFY_WATCH:
383 log_debug("%s %u\n", token_str(type), token->key.watch);
384 break;
385 case TK_A_DEVLINK_PRIO:
386 log_debug("%s %u\n", token_str(type), token->key.devlink_prio);
387 break;
388 case TK_A_OWNER_ID:
389 log_debug("%s %s %u\n", token_str(type), operation_str(op), token->key.uid);
390 break;
391 case TK_A_GROUP_ID:
392 log_debug("%s %s %u\n", token_str(type), operation_str(op), token->key.gid);
393 break;
394 case TK_A_MODE_ID:
395 log_debug("%s %s %#o\n", token_str(type), operation_str(op), token->key.mode);
396 break;
397 case TK_A_STATIC_NODE:
398 log_debug("%s '%s'\n", token_str(type), value);
399 break;
400 case TK_M_EVENT_TIMEOUT:
401 log_debug("%s %u\n", token_str(type), token->key.event_timeout);
402 break;
403 case TK_A_GOTO:
404 log_debug("%s '%s' %u\n", token_str(type), value, token->key.rule_goto);
405 break;
406 case TK_END:
407 log_debug("* %s\n", token_str(type));
408 break;
409 case TK_M_PARENTS_MIN:
410 case TK_M_PARENTS_MAX:
411 case TK_M_MAX:
412 case TK_UNSET:
413 log_debug("unknown type %u\n", type);
414 break;
415 }
416 }
417
418 static void dump_rules(struct udev_rules *rules)
419 {
420 unsigned int i;
421
422 log_debug("dumping %u (%zu bytes) tokens, %u (%zu bytes) strings\n",
423 rules->token_cur,
424 rules->token_cur * sizeof(struct token),
425 rules->buf_count,
426 rules->buf_cur);
427 for(i = 0; i < rules->token_cur; i++)
428 dump_token(rules, &rules->tokens[i]);
429 }
430 #else
431 static inline const char *operation_str(enum operation_type type) { return NULL; }
432 static inline const char *token_str(enum token_type type) { return NULL; }
433 static inline void dump_token(struct udev_rules *rules, struct token *token) {}
434 static inline void dump_rules(struct udev_rules *rules) {}
435 #endif /* DEBUG */
436
437 static int add_token(struct udev_rules *rules, struct token *token)
438 {
439 /* grow buffer if needed */
440 if (rules->token_cur+1 >= rules->token_max) {
441 struct token *tokens;
442 unsigned int add;
443
444 /* double the buffer size */
445 add = rules->token_max;
446 if (add < 8)
447 add = 8;
448
449 tokens = realloc(rules->tokens, (rules->token_max + add ) * sizeof(struct token));
450 if (tokens == NULL)
451 return -1;
452 rules->tokens = tokens;
453 rules->token_max += add;
454 }
455 memcpy(&rules->tokens[rules->token_cur], token, sizeof(struct token));
456 rules->token_cur++;
457 return 0;
458 }
459
460 static uid_t add_uid(struct udev_rules *rules, const char *owner)
461 {
462 unsigned int i;
463 uid_t uid;
464 unsigned int off;
465
466 /* lookup, if we know it already */
467 for (i = 0; i < rules->uids_cur; i++) {
468 off = rules->uids[i].name_off;
469 if (streq(rules_str(rules, off), owner)) {
470 uid = rules->uids[i].uid;
471 return uid;
472 }
473 }
474 uid = util_lookup_user(rules->udev, owner);
475
476 /* grow buffer if needed */
477 if (rules->uids_cur+1 >= rules->uids_max) {
478 struct uid_gid *uids;
479 unsigned int add;
480
481 /* double the buffer size */
482 add = rules->uids_max;
483 if (add < 1)
484 add = 8;
485
486 uids = realloc(rules->uids, (rules->uids_max + add ) * sizeof(struct uid_gid));
487 if (uids == NULL)
488 return uid;
489 rules->uids = uids;
490 rules->uids_max += add;
491 }
492 rules->uids[rules->uids_cur].uid = uid;
493 off = rules_add_string(rules, owner);
494 if (off <= 0)
495 return uid;
496 rules->uids[rules->uids_cur].name_off = off;
497 rules->uids_cur++;
498 return uid;
499 }
500
501 static gid_t add_gid(struct udev_rules *rules, const char *group)
502 {
503 unsigned int i;
504 gid_t gid;
505 unsigned int off;
506
507 /* lookup, if we know it already */
508 for (i = 0; i < rules->gids_cur; i++) {
509 off = rules->gids[i].name_off;
510 if (streq(rules_str(rules, off), group)) {
511 gid = rules->gids[i].gid;
512 return gid;
513 }
514 }
515 gid = util_lookup_group(rules->udev, group);
516
517 /* grow buffer if needed */
518 if (rules->gids_cur+1 >= rules->gids_max) {
519 struct uid_gid *gids;
520 unsigned int add;
521
522 /* double the buffer size */
523 add = rules->gids_max;
524 if (add < 1)
525 add = 8;
526
527 gids = realloc(rules->gids, (rules->gids_max + add ) * sizeof(struct uid_gid));
528 if (gids == NULL)
529 return gid;
530 rules->gids = gids;
531 rules->gids_max += add;
532 }
533 rules->gids[rules->gids_cur].gid = gid;
534 off = rules_add_string(rules, group);
535 if (off <= 0)
536 return gid;
537 rules->gids[rules->gids_cur].name_off = off;
538 rules->gids_cur++;
539 return gid;
540 }
541
542 static int import_property_from_string(struct udev_device *dev, char *line)
543 {
544 char *key;
545 char *val;
546 size_t len;
547
548 /* find key */
549 key = line;
550 while (isspace(key[0]))
551 key++;
552
553 /* comment or empty line */
554 if (key[0] == '#' || key[0] == '\0')
555 return -1;
556
557 /* split key/value */
558 val = strchr(key, '=');
559 if (val == NULL)
560 return -1;
561 val[0] = '\0';
562 val++;
563
564 /* find value */
565 while (isspace(val[0]))
566 val++;
567
568 /* terminate key */
569 len = strlen(key);
570 if (len == 0)
571 return -1;
572 while (isspace(key[len-1]))
573 len--;
574 key[len] = '\0';
575
576 /* terminate value */
577 len = strlen(val);
578 if (len == 0)
579 return -1;
580 while (isspace(val[len-1]))
581 len--;
582 val[len] = '\0';
583
584 if (len == 0)
585 return -1;
586
587 /* unquote */
588 if (val[0] == '"' || val[0] == '\'') {
589 if (val[len-1] != val[0]) {
590 log_debug("inconsistent quoting: '%s', skip\n", line);
591 return -1;
592 }
593 val[len-1] = '\0';
594 val++;
595 }
596
597 /* handle device, renamed by external tool, returning new path */
598 if (streq(key, "DEVPATH")) {
599 char syspath[UTIL_PATH_SIZE];
600
601 log_debug("updating devpath from '%s' to '%s'\n",
602 udev_device_get_devpath(dev), val);
603 strscpyl(syspath, sizeof(syspath), "/sys", val, NULL);
604 udev_device_set_syspath(dev, syspath);
605 } else {
606 struct udev_list_entry *entry;
607
608 entry = udev_device_add_property(dev, key, val);
609 /* store in db, skip private keys */
610 if (key[0] != '.')
611 udev_list_entry_set_num(entry, true);
612 }
613 return 0;
614 }
615
616 static int import_file_into_properties(struct udev_device *dev, const char *filename)
617 {
618 FILE *f;
619 char line[UTIL_LINE_SIZE];
620
621 f = fopen(filename, "re");
622 if (f == NULL)
623 return -1;
624 while (fgets(line, sizeof(line), f) != NULL)
625 import_property_from_string(dev, line);
626 fclose(f);
627 return 0;
628 }
629
630 static int import_program_into_properties(struct udev_event *event, const char *program, const sigset_t *sigmask)
631 {
632 struct udev_device *dev = event->dev;
633 char **envp;
634 char result[UTIL_LINE_SIZE];
635 char *line;
636 int err;
637
638 envp = udev_device_get_properties_envp(dev);
639 err = udev_event_spawn(event, program, envp, sigmask, result, sizeof(result));
640 if (err < 0)
641 return err;
642
643 line = result;
644 while (line != NULL) {
645 char *pos;
646
647 pos = strchr(line, '\n');
648 if (pos != NULL) {
649 pos[0] = '\0';
650 pos = &pos[1];
651 }
652 import_property_from_string(dev, line);
653 line = pos;
654 }
655 return 0;
656 }
657
658 static int import_parent_into_properties(struct udev_device *dev, const char *filter)
659 {
660 struct udev_device *dev_parent;
661 struct udev_list_entry *list_entry;
662
663 dev_parent = udev_device_get_parent(dev);
664 if (dev_parent == NULL)
665 return -1;
666
667 udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(dev_parent)) {
668 const char *key = udev_list_entry_get_name(list_entry);
669 const char *val = udev_list_entry_get_value(list_entry);
670
671 if (fnmatch(filter, key, 0) == 0) {
672 struct udev_list_entry *entry;
673
674 entry = udev_device_add_property(dev, key, val);
675 /* store in db, skip private keys */
676 if (key[0] != '.')
677 udev_list_entry_set_num(entry, true);
678 }
679 }
680 return 0;
681 }
682
683 #define WAIT_LOOP_PER_SECOND 50
684 static int wait_for_file(struct udev_device *dev, const char *file, int timeout)
685 {
686 char filepath[UTIL_PATH_SIZE];
687 char devicepath[UTIL_PATH_SIZE];
688 struct stat stats;
689 int loop = timeout * WAIT_LOOP_PER_SECOND;
690
691 /* a relative path is a device attribute */
692 devicepath[0] = '\0';
693 if (file[0] != '/') {
694 strscpyl(devicepath, sizeof(devicepath), udev_device_get_syspath(dev), NULL);
695 strscpyl(filepath, sizeof(filepath), devicepath, "/", file, NULL);
696 file = filepath;
697 }
698
699 while (--loop) {
700 const struct timespec duration = { 0, 1000 * 1000 * 1000 / WAIT_LOOP_PER_SECOND };
701
702 /* lookup file */
703 if (stat(file, &stats) == 0) {
704 log_debug("file '%s' appeared after %i loops\n", file, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
705 return 0;
706 }
707 /* make sure, the device did not disappear in the meantime */
708 if (devicepath[0] != '\0' && stat(devicepath, &stats) != 0) {
709 log_debug("device disappeared while waiting for '%s'\n", file);
710 return -2;
711 }
712 log_debug("wait for '%s' for %i mseconds\n", file, 1000 / WAIT_LOOP_PER_SECOND);
713 nanosleep(&duration, NULL);
714 }
715 log_debug("waiting for '%s' failed\n", file);
716 return -1;
717 }
718
719 static int attr_subst_subdir(char *attr, size_t len)
720 {
721 bool found = false;
722
723 if (strstr(attr, "/*/")) {
724 char *pos;
725 char dirname[UTIL_PATH_SIZE];
726 const char *tail;
727 DIR *dir;
728
729 strscpy(dirname, sizeof(dirname), attr);
730 pos = strstr(dirname, "/*/");
731 if (pos == NULL)
732 return -1;
733 pos[0] = '\0';
734 tail = &pos[2];
735 dir = opendir(dirname);
736 if (dir != NULL) {
737 struct dirent *dent;
738
739 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
740 struct stat stats;
741
742 if (dent->d_name[0] == '.')
743 continue;
744 strscpyl(attr, len, dirname, "/", dent->d_name, tail, NULL);
745 if (stat(attr, &stats) == 0) {
746 found = true;
747 break;
748 }
749 }
750 closedir(dir);
751 }
752 }
753
754 return found;
755 }
756
757 static int get_key(struct udev *udev, char **line, char **key, enum operation_type *op, char **value)
758 {
759 char *linepos;
760 char *temp;
761
762 linepos = *line;
763 if (linepos == NULL || linepos[0] == '\0')
764 return -1;
765
766 /* skip whitespace */
767 while (isspace(linepos[0]) || linepos[0] == ',')
768 linepos++;
769
770 /* get the key */
771 if (linepos[0] == '\0')
772 return -1;
773 *key = linepos;
774
775 for (;;) {
776 linepos++;
777 if (linepos[0] == '\0')
778 return -1;
779 if (isspace(linepos[0]))
780 break;
781 if (linepos[0] == '=')
782 break;
783 if ((linepos[0] == '+') || (linepos[0] == '!') || (linepos[0] == ':'))
784 if (linepos[1] == '=')
785 break;
786 }
787
788 /* remember end of key */
789 temp = linepos;
790
791 /* skip whitespace after key */
792 while (isspace(linepos[0]))
793 linepos++;
794 if (linepos[0] == '\0')
795 return -1;
796
797 /* get operation type */
798 if (linepos[0] == '=' && linepos[1] == '=') {
799 *op = OP_MATCH;
800 linepos += 2;
801 } else if (linepos[0] == '!' && linepos[1] == '=') {
802 *op = OP_NOMATCH;
803 linepos += 2;
804 } else if (linepos[0] == '+' && linepos[1] == '=') {
805 *op = OP_ADD;
806 linepos += 2;
807 } else if (linepos[0] == '=') {
808 *op = OP_ASSIGN;
809 linepos++;
810 } else if (linepos[0] == ':' && linepos[1] == '=') {
811 *op = OP_ASSIGN_FINAL;
812 linepos += 2;
813 } else
814 return -1;
815
816 /* terminate key */
817 temp[0] = '\0';
818
819 /* skip whitespace after operator */
820 while (isspace(linepos[0]))
821 linepos++;
822 if (linepos[0] == '\0')
823 return -1;
824
825 /* get the value */
826 if (linepos[0] == '"')
827 linepos++;
828 else
829 return -1;
830 *value = linepos;
831
832 /* terminate */
833 temp = strchr(linepos, '"');
834 if (!temp)
835 return -1;
836 temp[0] = '\0';
837 temp++;
838
839 /* move line to next key */
840 *line = temp;
841 return 0;
842 }
843
844 /* extract possible KEY{attr} */
845 static const char *get_key_attribute(struct udev *udev, char *str)
846 {
847 char *pos;
848 char *attr;
849
850 attr = strchr(str, '{');
851 if (attr != NULL) {
852 attr++;
853 pos = strchr(attr, '}');
854 if (pos == NULL) {
855 log_error("missing closing brace for format\n");
856 return NULL;
857 }
858 pos[0] = '\0';
859 return attr;
860 }
861 return NULL;
862 }
863
864 static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
865 enum operation_type op,
866 const char *value, const void *data)
867 {
868 struct token *token = &rule_tmp->token[rule_tmp->token_cur];
869 const char *attr = NULL;
870
871 memset(token, 0x00, sizeof(struct token));
872
873 switch (type) {
874 case TK_M_ACTION:
875 case TK_M_DEVPATH:
876 case TK_M_KERNEL:
877 case TK_M_SUBSYSTEM:
878 case TK_M_DRIVER:
879 case TK_M_WAITFOR:
880 case TK_M_DEVLINK:
881 case TK_M_NAME:
882 case TK_M_KERNELS:
883 case TK_M_SUBSYSTEMS:
884 case TK_M_DRIVERS:
885 case TK_M_TAGS:
886 case TK_M_PROGRAM:
887 case TK_M_IMPORT_FILE:
888 case TK_M_IMPORT_PROG:
889 case TK_M_IMPORT_DB:
890 case TK_M_IMPORT_CMDLINE:
891 case TK_M_IMPORT_PARENT:
892 case TK_M_RESULT:
893 case TK_A_OWNER:
894 case TK_A_GROUP:
895 case TK_A_MODE:
896 case TK_A_DEVLINK:
897 case TK_A_NAME:
898 case TK_A_GOTO:
899 case TK_M_TAG:
900 case TK_A_TAG:
901 token->key.value_off = rules_add_string(rule_tmp->rules, value);
902 break;
903 case TK_M_IMPORT_BUILTIN:
904 token->key.value_off = rules_add_string(rule_tmp->rules, value);
905 token->key.builtin_cmd = *(enum udev_builtin_cmd *)data;
906 break;
907 case TK_M_ENV:
908 case TK_M_ATTR:
909 case TK_M_ATTRS:
910 case TK_A_ATTR:
911 case TK_A_ENV:
912 attr = data;
913 token->key.value_off = rules_add_string(rule_tmp->rules, value);
914 token->key.attr_off = rules_add_string(rule_tmp->rules, attr);
915 break;
916 case TK_M_TEST:
917 token->key.value_off = rules_add_string(rule_tmp->rules, value);
918 if (data != NULL)
919 token->key.mode = *(mode_t *)data;
920 break;
921 case TK_A_STRING_ESCAPE_NONE:
922 case TK_A_STRING_ESCAPE_REPLACE:
923 case TK_A_DB_PERSIST:
924 break;
925 case TK_A_RUN_BUILTIN:
926 case TK_A_RUN_PROGRAM:
927 token->key.builtin_cmd = *(enum udev_builtin_cmd *)data;
928 token->key.value_off = rules_add_string(rule_tmp->rules, value);
929 break;
930 case TK_A_INOTIFY_WATCH:
931 case TK_A_DEVLINK_PRIO:
932 token->key.devlink_prio = *(int *)data;
933 break;
934 case TK_A_OWNER_ID:
935 token->key.uid = *(uid_t *)data;
936 break;
937 case TK_A_GROUP_ID:
938 token->key.gid = *(gid_t *)data;
939 break;
940 case TK_A_MODE_ID:
941 token->key.mode = *(mode_t *)data;
942 break;
943 case TK_A_STATIC_NODE:
944 token->key.value_off = rules_add_string(rule_tmp->rules, value);
945 break;
946 case TK_M_EVENT_TIMEOUT:
947 token->key.event_timeout = *(int *)data;
948 break;
949 case TK_RULE:
950 case TK_M_PARENTS_MIN:
951 case TK_M_PARENTS_MAX:
952 case TK_M_MAX:
953 case TK_END:
954 case TK_UNSET:
955 log_error("wrong type %u\n", type);
956 return -1;
957 }
958
959 if (value != NULL && type < TK_M_MAX) {
960 /* check if we need to split or call fnmatch() while matching rules */
961 enum string_glob_type glob;
962 int has_split;
963 int has_glob;
964
965 has_split = (strchr(value, '|') != NULL);
966 has_glob = (strchr(value, '*') != NULL || strchr(value, '?') != NULL || strchr(value, '[') != NULL);
967 if (has_split && has_glob) {
968 glob = GL_SPLIT_GLOB;
969 } else if (has_split) {
970 glob = GL_SPLIT;
971 } else if (has_glob) {
972 if (streq(value, "?*"))
973 glob = GL_SOMETHING;
974 else
975 glob = GL_GLOB;
976 } else {
977 glob = GL_PLAIN;
978 }
979 token->key.glob = glob;
980 }
981
982 if (value != NULL && type > TK_M_MAX) {
983 /* check if assigned value has substitution chars */
984 if (value[0] == '[')
985 token->key.subst = SB_SUBSYS;
986 else if (strchr(value, '%') != NULL || strchr(value, '$') != NULL)
987 token->key.subst = SB_FORMAT;
988 else
989 token->key.subst = SB_NONE;
990 }
991
992 if (attr != NULL) {
993 /* check if property/attribut name has substitution chars */
994 if (attr[0] == '[')
995 token->key.attrsubst = SB_SUBSYS;
996 else if (strchr(attr, '%') != NULL || strchr(attr, '$') != NULL)
997 token->key.attrsubst = SB_FORMAT;
998 else
999 token->key.attrsubst = SB_NONE;
1000 }
1001
1002 token->key.type = type;
1003 token->key.op = op;
1004 rule_tmp->token_cur++;
1005 if (rule_tmp->token_cur >= ELEMENTSOF(rule_tmp->token)) {
1006 log_error("temporary rule array too small\n");
1007 return -1;
1008 }
1009 return 0;
1010 }
1011
1012 static int sort_token(struct udev_rules *rules, struct rule_tmp *rule_tmp)
1013 {
1014 unsigned int i;
1015 unsigned int start = 0;
1016 unsigned int end = rule_tmp->token_cur;
1017
1018 for (i = 0; i < rule_tmp->token_cur; i++) {
1019 enum token_type next_val = TK_UNSET;
1020 unsigned int next_idx = 0;
1021 unsigned int j;
1022
1023 /* find smallest value */
1024 for (j = start; j < end; j++) {
1025 if (rule_tmp->token[j].type == TK_UNSET)
1026 continue;
1027 if (next_val == TK_UNSET || rule_tmp->token[j].type < next_val) {
1028 next_val = rule_tmp->token[j].type;
1029 next_idx = j;
1030 }
1031 }
1032
1033 /* add token and mark done */
1034 if (add_token(rules, &rule_tmp->token[next_idx]) != 0)
1035 return -1;
1036 rule_tmp->token[next_idx].type = TK_UNSET;
1037
1038 /* shrink range */
1039 if (next_idx == start)
1040 start++;
1041 if (next_idx+1 == end)
1042 end--;
1043 }
1044 return 0;
1045 }
1046
1047 static int add_rule(struct udev_rules *rules, char *line,
1048 const char *filename, unsigned int filename_off, unsigned int lineno)
1049 {
1050 char *linepos;
1051 const char *attr;
1052 struct rule_tmp rule_tmp;
1053
1054 memset(&rule_tmp, 0x00, sizeof(struct rule_tmp));
1055 rule_tmp.rules = rules;
1056 rule_tmp.rule.type = TK_RULE;
1057 /* the offset in the rule is limited to unsigned short */
1058 if (filename_off < USHRT_MAX)
1059 rule_tmp.rule.rule.filename_off = filename_off;
1060 rule_tmp.rule.rule.filename_line = lineno;
1061
1062 linepos = line;
1063 for (;;) {
1064 char *key;
1065 char *value;
1066 enum operation_type op;
1067
1068 if (get_key(rules->udev, &linepos, &key, &op, &value) != 0)
1069 break;
1070
1071 if (streq(key, "ACTION")) {
1072 if (op > OP_MATCH_MAX) {
1073 log_error("invalid ACTION operation\n");
1074 goto invalid;
1075 }
1076 rule_add_key(&rule_tmp, TK_M_ACTION, op, value, NULL);
1077 continue;
1078 }
1079
1080 if (streq(key, "DEVPATH")) {
1081 if (op > OP_MATCH_MAX) {
1082 log_error("invalid DEVPATH operation\n");
1083 goto invalid;
1084 }
1085 rule_add_key(&rule_tmp, TK_M_DEVPATH, op, value, NULL);
1086 continue;
1087 }
1088
1089 if (streq(key, "KERNEL")) {
1090 if (op > OP_MATCH_MAX) {
1091 log_error("invalid KERNEL operation\n");
1092 goto invalid;
1093 }
1094 rule_add_key(&rule_tmp, TK_M_KERNEL, op, value, NULL);
1095 continue;
1096 }
1097
1098 if (streq(key, "SUBSYSTEM")) {
1099 if (op > OP_MATCH_MAX) {
1100 log_error("invalid SUBSYSTEM operation\n");
1101 goto invalid;
1102 }
1103 /* bus, class, subsystem events should all be the same */
1104 if (streq(value, "subsystem") ||
1105 streq(value, "bus") ||
1106 streq(value, "class")) {
1107 if (streq(value, "bus") || streq(value, "class"))
1108 log_error("'%s' must be specified as 'subsystem' \n"
1109 "please fix it in %s:%u", value, filename, lineno);
1110 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, "subsystem|class|bus", NULL);
1111 } else
1112 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, value, NULL);
1113 continue;
1114 }
1115
1116 if (streq(key, "DRIVER")) {
1117 if (op > OP_MATCH_MAX) {
1118 log_error("invalid DRIVER operation\n");
1119 goto invalid;
1120 }
1121 rule_add_key(&rule_tmp, TK_M_DRIVER, op, value, NULL);
1122 continue;
1123 }
1124
1125 if (startswith(key, "ATTR{")) {
1126 attr = get_key_attribute(rules->udev, key + sizeof("ATTR")-1);
1127 if (attr == NULL) {
1128 log_error("error parsing ATTR attribute\n");
1129 goto invalid;
1130 }
1131 if (op < OP_MATCH_MAX) {
1132 rule_add_key(&rule_tmp, TK_M_ATTR, op, value, attr);
1133 } else {
1134 rule_add_key(&rule_tmp, TK_A_ATTR, op, value, attr);
1135 }
1136 continue;
1137 }
1138
1139 if (streq(key, "KERNELS")) {
1140 if (op > OP_MATCH_MAX) {
1141 log_error("invalid KERNELS operation\n");
1142 goto invalid;
1143 }
1144 rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1145 continue;
1146 }
1147
1148 if (streq(key, "SUBSYSTEMS")) {
1149 if (op > OP_MATCH_MAX) {
1150 log_error("invalid SUBSYSTEMS operation\n");
1151 goto invalid;
1152 }
1153 rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1154 continue;
1155 }
1156
1157 if (streq(key, "DRIVERS")) {
1158 if (op > OP_MATCH_MAX) {
1159 log_error("invalid DRIVERS operation\n");
1160 goto invalid;
1161 }
1162 rule_add_key(&rule_tmp, TK_M_DRIVERS, op, value, NULL);
1163 continue;
1164 }
1165
1166 if (startswith(key, "ATTRS{")) {
1167 if (op > OP_MATCH_MAX) {
1168 log_error("invalid ATTRS operation\n");
1169 goto invalid;
1170 }
1171 attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);
1172 if (attr == NULL) {
1173 log_error("error parsing ATTRS attribute\n");
1174 goto invalid;
1175 }
1176 if (startswith(attr, "device/"))
1177 log_error("the 'device' link may not be available in a future kernel, "
1178 "please fix it in %s:%u", filename, lineno);
1179 else if (strstr(attr, "../") != NULL)
1180 log_error("do not reference parent sysfs directories directly, "
1181 "it may break with a future kernel, please fix it in %s:%u", filename, lineno);
1182 rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1183 continue;
1184 }
1185
1186 if (streq(key, "TAGS")) {
1187 if (op > OP_MATCH_MAX) {
1188 log_error("invalid TAGS operation\n");
1189 goto invalid;
1190 }
1191 rule_add_key(&rule_tmp, TK_M_TAGS, op, value, NULL);
1192 continue;
1193 }
1194
1195 if (startswith(key, "ENV{")) {
1196 attr = get_key_attribute(rules->udev, key + sizeof("ENV")-1);
1197 if (attr == NULL) {
1198 log_error("error parsing ENV attribute\n");
1199 goto invalid;
1200 }
1201 if (op < OP_MATCH_MAX) {
1202 if (rule_add_key(&rule_tmp, TK_M_ENV, op, value, attr) != 0)
1203 goto invalid;
1204 } else {
1205 static const char *blacklist[] = {
1206 "ACTION",
1207 "SUBSYSTEM",
1208 "DEVTYPE",
1209 "MAJOR",
1210 "MINOR",
1211 "DRIVER",
1212 "IFINDEX",
1213 "DEVNAME",
1214 "DEVLINKS",
1215 "DEVPATH",
1216 "TAGS",
1217 };
1218 unsigned int i;
1219
1220 for (i = 0; i < ELEMENTSOF(blacklist); i++) {
1221 if (!streq(attr, blacklist[i]))
1222 continue;
1223 log_error("invalid ENV attribute, '%s' can not be set %s:%u\n", attr, filename, lineno);
1224 goto invalid;
1225 }
1226 if (rule_add_key(&rule_tmp, TK_A_ENV, op, value, attr) != 0)
1227 goto invalid;
1228 }
1229 continue;
1230 }
1231
1232 if (streq(key, "TAG")) {
1233 if (op < OP_MATCH_MAX)
1234 rule_add_key(&rule_tmp, TK_M_TAG, op, value, NULL);
1235 else
1236 rule_add_key(&rule_tmp, TK_A_TAG, op, value, NULL);
1237 continue;
1238 }
1239
1240 if (streq(key, "PROGRAM")) {
1241 rule_add_key(&rule_tmp, TK_M_PROGRAM, op, value, NULL);
1242 continue;
1243 }
1244
1245 if (streq(key, "RESULT")) {
1246 if (op > OP_MATCH_MAX) {
1247 log_error("invalid RESULT operation\n");
1248 goto invalid;
1249 }
1250 rule_add_key(&rule_tmp, TK_M_RESULT, op, value, NULL);
1251 continue;
1252 }
1253
1254 if (startswith(key, "IMPORT")) {
1255 attr = get_key_attribute(rules->udev, key + sizeof("IMPORT")-1);
1256 if (attr == NULL) {
1257 log_error("IMPORT{} type missing, ignoring IMPORT %s:%u\n", filename, lineno);
1258 continue;
1259 }
1260 if (streq(attr, "program")) {
1261 /* find known built-in command */
1262 if (value[0] != '/') {
1263 enum udev_builtin_cmd cmd;
1264
1265 cmd = udev_builtin_lookup(value);
1266 if (cmd < UDEV_BUILTIN_MAX) {
1267 log_debug("IMPORT found builtin '%s', replacing %s:%u\n",
1268 value, filename, lineno);
1269 rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, value, &cmd);
1270 continue;
1271 }
1272 }
1273 rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1274 } else if (streq(attr, "builtin")) {
1275 enum udev_builtin_cmd cmd = udev_builtin_lookup(value);
1276
1277 if (cmd < UDEV_BUILTIN_MAX)
1278 rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, value, &cmd);
1279 else
1280 log_error("IMPORT{builtin}: '%s' unknown %s:%u\n", value, filename, lineno);
1281 } else if (streq(attr, "file")) {
1282 rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1283 } else if (streq(attr, "db")) {
1284 rule_add_key(&rule_tmp, TK_M_IMPORT_DB, op, value, NULL);
1285 } else if (streq(attr, "cmdline")) {
1286 rule_add_key(&rule_tmp, TK_M_IMPORT_CMDLINE, op, value, NULL);
1287 } else if (streq(attr, "parent")) {
1288 rule_add_key(&rule_tmp, TK_M_IMPORT_PARENT, op, value, NULL);
1289 } else
1290 log_error("IMPORT{} unknown type, ignoring IMPORT %s:%u\n", filename, lineno);
1291 continue;
1292 }
1293
1294 if (startswith(key, "TEST")) {
1295 mode_t mode = 0;
1296
1297 if (op > OP_MATCH_MAX) {
1298 log_error("invalid TEST operation\n");
1299 goto invalid;
1300 }
1301 attr = get_key_attribute(rules->udev, key + sizeof("TEST")-1);
1302 if (attr != NULL) {
1303 mode = strtol(attr, NULL, 8);
1304 rule_add_key(&rule_tmp, TK_M_TEST, op, value, &mode);
1305 } else {
1306 rule_add_key(&rule_tmp, TK_M_TEST, op, value, NULL);
1307 }
1308 continue;
1309 }
1310
1311 if (startswith(key, "RUN")) {
1312 attr = get_key_attribute(rules->udev, key + sizeof("RUN")-1);
1313 if (attr == NULL)
1314 attr = "program";
1315
1316 if (streq(attr, "builtin")) {
1317 enum udev_builtin_cmd cmd = udev_builtin_lookup(value);
1318
1319 if (cmd < UDEV_BUILTIN_MAX)
1320 rule_add_key(&rule_tmp, TK_A_RUN_BUILTIN, op, value, &cmd);
1321 else
1322 log_error("IMPORT{builtin}: '%s' unknown %s:%u\n", value, filename, lineno);
1323 } else if (streq(attr, "program")) {
1324 enum udev_builtin_cmd cmd = UDEV_BUILTIN_MAX;
1325
1326 rule_add_key(&rule_tmp, TK_A_RUN_PROGRAM, op, value, &cmd);
1327 } else {
1328 log_error("RUN{} unknown type, ignoring RUN %s:%u\n", filename, lineno);
1329 }
1330
1331 continue;
1332 }
1333
1334 if (streq(key, "WAIT_FOR") || streq(key, "WAIT_FOR_SYSFS")) {
1335 rule_add_key(&rule_tmp, TK_M_WAITFOR, 0, value, NULL);
1336 continue;
1337 }
1338
1339 if (streq(key, "LABEL")) {
1340 rule_tmp.rule.rule.label_off = rules_add_string(rules, value);
1341 continue;
1342 }
1343
1344 if (streq(key, "GOTO")) {
1345 rule_add_key(&rule_tmp, TK_A_GOTO, 0, value, NULL);
1346 continue;
1347 }
1348
1349 if (startswith(key, "NAME")) {
1350 if (op < OP_MATCH_MAX) {
1351 rule_add_key(&rule_tmp, TK_M_NAME, op, value, NULL);
1352 } else {
1353 if (streq(value, "%k")) {
1354 log_error("NAME=\"%%k\" is ignored, because it breaks kernel supplied names, "
1355 "please remove it from %s:%u\n", filename, lineno);
1356 continue;
1357 }
1358 if (value[0] == '\0') {
1359 log_debug("NAME=\"\" is ignored, because udev will not delete any device nodes, "
1360 "please remove it from %s:%u\n", filename, lineno);
1361 continue;
1362 }
1363 rule_add_key(&rule_tmp, TK_A_NAME, op, value, NULL);
1364 }
1365 rule_tmp.rule.rule.can_set_name = true;
1366 continue;
1367 }
1368
1369 if (streq(key, "SYMLINK")) {
1370 if (op < OP_MATCH_MAX)
1371 rule_add_key(&rule_tmp, TK_M_DEVLINK, op, value, NULL);
1372 else
1373 rule_add_key(&rule_tmp, TK_A_DEVLINK, op, value, NULL);
1374 rule_tmp.rule.rule.can_set_name = true;
1375 continue;
1376 }
1377
1378 if (streq(key, "OWNER")) {
1379 uid_t uid;
1380 char *endptr;
1381
1382 uid = strtoul(value, &endptr, 10);
1383 if (endptr[0] == '\0') {
1384 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1385 } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1386 uid = add_uid(rules, value);
1387 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1388 } else if (rules->resolve_names >= 0) {
1389 rule_add_key(&rule_tmp, TK_A_OWNER, op, value, NULL);
1390 }
1391 rule_tmp.rule.rule.can_set_name = true;
1392 continue;
1393 }
1394
1395 if (streq(key, "GROUP")) {
1396 gid_t gid;
1397 char *endptr;
1398
1399 gid = strtoul(value, &endptr, 10);
1400 if (endptr[0] == '\0') {
1401 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1402 } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1403 gid = add_gid(rules, value);
1404 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1405 } else if (rules->resolve_names >= 0) {
1406 rule_add_key(&rule_tmp, TK_A_GROUP, op, value, NULL);
1407 }
1408 rule_tmp.rule.rule.can_set_name = true;
1409 continue;
1410 }
1411
1412 if (streq(key, "MODE")) {
1413 mode_t mode;
1414 char *endptr;
1415
1416 mode = strtol(value, &endptr, 8);
1417 if (endptr[0] == '\0')
1418 rule_add_key(&rule_tmp, TK_A_MODE_ID, op, NULL, &mode);
1419 else
1420 rule_add_key(&rule_tmp, TK_A_MODE, op, value, NULL);
1421 rule_tmp.rule.rule.can_set_name = true;
1422 continue;
1423 }
1424
1425 if (streq(key, "OPTIONS")) {
1426 const char *pos;
1427
1428 pos = strstr(value, "link_priority=");
1429 if (pos != NULL) {
1430 int prio = atoi(&pos[strlen("link_priority=")]);
1431
1432 rule_add_key(&rule_tmp, TK_A_DEVLINK_PRIO, op, NULL, &prio);
1433 }
1434
1435 pos = strstr(value, "event_timeout=");
1436 if (pos != NULL) {
1437 int tout = atoi(&pos[strlen("event_timeout=")]);
1438
1439 rule_add_key(&rule_tmp, TK_M_EVENT_TIMEOUT, op, NULL, &tout);
1440 }
1441
1442 pos = strstr(value, "string_escape=");
1443 if (pos != NULL) {
1444 pos = &pos[strlen("string_escape=")];
1445 if (startswith(pos, "none"))
1446 rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_NONE, op, NULL, NULL);
1447 else if (startswith(pos, "replace"))
1448 rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_REPLACE, op, NULL, NULL);
1449 }
1450
1451 pos = strstr(value, "db_persist");
1452 if (pos != NULL)
1453 rule_add_key(&rule_tmp, TK_A_DB_PERSIST, op, NULL, NULL);
1454
1455 pos = strstr(value, "nowatch");
1456 if (pos != NULL) {
1457 const int off = 0;
1458
1459 rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &off);
1460 } else {
1461 pos = strstr(value, "watch");
1462 if (pos != NULL) {
1463 const int on = 1;
1464
1465 rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &on);
1466 }
1467 }
1468
1469 pos = strstr(value, "static_node=");
1470 if (pos != NULL) {
1471 rule_add_key(&rule_tmp, TK_A_STATIC_NODE, op, &pos[strlen("static_node=")], NULL);
1472 rule_tmp.rule.rule.has_static_node = true;
1473 }
1474
1475 continue;
1476 }
1477
1478 log_error("unknown key '%s' in %s:%u\n", key, filename, lineno);
1479 goto invalid;
1480 }
1481
1482 /* add rule token */
1483 rule_tmp.rule.rule.token_count = 1 + rule_tmp.token_cur;
1484 if (add_token(rules, &rule_tmp.rule) != 0)
1485 goto invalid;
1486
1487 /* add tokens to list, sorted by type */
1488 if (sort_token(rules, &rule_tmp) != 0)
1489 goto invalid;
1490
1491 return 0;
1492 invalid:
1493 log_error("invalid rule '%s:%u'\n", filename, lineno);
1494 return -1;
1495 }
1496
1497 static int parse_file(struct udev_rules *rules, const char *filename)
1498 {
1499 FILE *f;
1500 unsigned int first_token;
1501 unsigned int filename_off;
1502 char line[UTIL_LINE_SIZE];
1503 int line_nr = 0;
1504 unsigned int i;
1505
1506 if (null_or_empty_path(filename)) {
1507 log_debug("skip empty file: %s\n", filename);
1508 return 0;
1509 }
1510 log_debug("read rules file: %s\n", filename);
1511
1512 f = fopen(filename, "re");
1513 if (f == NULL)
1514 return -1;
1515
1516 first_token = rules->token_cur;
1517 filename_off = rules_add_string(rules, filename);
1518
1519 while (fgets(line, sizeof(line), f) != NULL) {
1520 char *key;
1521 size_t len;
1522
1523 /* skip whitespace */
1524 line_nr++;
1525 key = line;
1526 while (isspace(key[0]))
1527 key++;
1528
1529 /* comment */
1530 if (key[0] == '#')
1531 continue;
1532
1533 len = strlen(line);
1534 if (len < 3)
1535 continue;
1536
1537 /* continue reading if backslash+newline is found */
1538 while (line[len-2] == '\\') {
1539 if (fgets(&line[len-2], (sizeof(line)-len)+2, f) == NULL)
1540 break;
1541 if (strlen(&line[len-2]) < 2)
1542 break;
1543 line_nr++;
1544 len = strlen(line);
1545 }
1546
1547 if (len+1 >= sizeof(line)) {
1548 log_error("line too long '%s':%u, ignored\n", filename, line_nr);
1549 continue;
1550 }
1551 add_rule(rules, key, filename, filename_off, line_nr);
1552 }
1553 fclose(f);
1554
1555 /* link GOTOs to LABEL rules in this file to be able to fast-forward */
1556 for (i = first_token+1; i < rules->token_cur; i++) {
1557 if (rules->tokens[i].type == TK_A_GOTO) {
1558 char *label = rules_str(rules, rules->tokens[i].key.value_off);
1559 unsigned int j;
1560
1561 for (j = i+1; j < rules->token_cur; j++) {
1562 if (rules->tokens[j].type != TK_RULE)
1563 continue;
1564 if (rules->tokens[j].rule.label_off == 0)
1565 continue;
1566 if (!streq(label, rules_str(rules, rules->tokens[j].rule.label_off)))
1567 continue;
1568 rules->tokens[i].key.rule_goto = j;
1569 break;
1570 }
1571 if (rules->tokens[i].key.rule_goto == 0)
1572 log_error("GOTO '%s' has no matching label in: '%s'\n", label, filename);
1573 }
1574 }
1575 return 0;
1576 }
1577
1578 struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
1579 {
1580 struct udev_rules *rules;
1581 struct udev_list file_list;
1582 struct token end_token;
1583 char **files, **f;
1584 int r;
1585
1586 rules = calloc(1, sizeof(struct udev_rules));
1587 if (rules == NULL)
1588 return NULL;
1589 rules->udev = udev;
1590 rules->resolve_names = resolve_names;
1591 udev_list_init(udev, &file_list, true);
1592
1593 /* init token array and string buffer */
1594 rules->tokens = malloc(PREALLOC_TOKEN * sizeof(struct token));
1595 if (rules->tokens == NULL)
1596 return udev_rules_unref(rules);
1597 rules->token_max = PREALLOC_TOKEN;
1598
1599 rules->strbuf = strbuf_new();
1600 if (!rules->strbuf)
1601 return udev_rules_unref(rules);
1602
1603 rules->dirs = strv_new("/etc/udev/rules.d",
1604 "/run/udev/rules.d",
1605 UDEVLIBEXECDIR "/rules.d",
1606 NULL);
1607 if (!rules->dirs) {
1608 log_error("failed to build config directory array");
1609 return udev_rules_unref(rules);
1610 }
1611 if (!path_strv_canonicalize(rules->dirs)) {
1612 log_error("failed to canonicalize config directories\n");
1613 return udev_rules_unref(rules);
1614 }
1615 strv_uniq(rules->dirs);
1616
1617 rules->dirs_ts_usec = calloc(strv_length(rules->dirs), sizeof(long long));
1618 if(!rules->dirs_ts_usec)
1619 return udev_rules_unref(rules);
1620 udev_rules_check_timestamp(rules);
1621
1622 r = conf_files_list_strv(&files, ".rules", NULL, (const char **)rules->dirs);
1623 if (r < 0) {
1624 log_error("failed to enumerate rules files: %s\n", strerror(-r));
1625 return udev_rules_unref(rules);
1626 }
1627
1628 /*
1629 * The offset value in the rules strct is limited; add all
1630 * rules file names to the beginning of the string buffer.
1631 */
1632 STRV_FOREACH(f, files)
1633 rules_add_string(rules, *f);
1634
1635 STRV_FOREACH(f, files)
1636 parse_file(rules, *f);
1637
1638 strv_free(files);
1639
1640 memset(&end_token, 0x00, sizeof(struct token));
1641 end_token.type = TK_END;
1642 add_token(rules, &end_token);
1643 log_debug("rules contain %zu bytes tokens (%u * %zu bytes), %zu bytes strings\n",
1644 rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->strbuf->len);
1645
1646 /* cleanup temporary strbuf data */
1647 log_debug("%zu strings (%zu bytes), %zu de-duplicated (%zu bytes), %zu trie nodes used\n",
1648 rules->strbuf->in_count, rules->strbuf->in_len,
1649 rules->strbuf->dedup_count, rules->strbuf->dedup_len, rules->strbuf->nodes_count);
1650 strbuf_complete(rules->strbuf);
1651
1652 /* cleanup uid/gid cache */
1653 free(rules->uids);
1654 rules->uids = NULL;
1655 rules->uids_cur = 0;
1656 rules->uids_max = 0;
1657 free(rules->gids);
1658 rules->gids = NULL;
1659 rules->gids_cur = 0;
1660 rules->gids_max = 0;
1661
1662 dump_rules(rules);
1663 return rules;
1664 }
1665
1666 struct udev_rules *udev_rules_unref(struct udev_rules *rules)
1667 {
1668 if (rules == NULL)
1669 return NULL;
1670 free(rules->tokens);
1671 strbuf_cleanup(rules->strbuf);
1672 free(rules->uids);
1673 free(rules->gids);
1674 strv_free(rules->dirs);
1675 free(rules->dirs_ts_usec);
1676 free(rules);
1677 return NULL;
1678 }
1679
1680 bool udev_rules_check_timestamp(struct udev_rules *rules)
1681 {
1682 unsigned int i;
1683 bool changed = false;
1684
1685 if (rules == NULL)
1686 goto out;
1687
1688 for (i = 0; rules->dirs[i]; i++) {
1689 struct stat stats;
1690
1691 if (stat(rules->dirs[i], &stats) < 0)
1692 continue;
1693
1694 if (rules->dirs_ts_usec[i] == timespec_load(&stats.st_mtim))
1695 continue;
1696
1697 /* first check */
1698 if (rules->dirs_ts_usec[i] != 0) {
1699 log_debug("reload - timestamp of '%s' changed\n", rules->dirs[i]);
1700 changed = true;
1701 }
1702
1703 /* update timestamp */
1704 rules->dirs_ts_usec[i] = timespec_load(&stats.st_mtim);
1705 }
1706 out:
1707 return changed;
1708 }
1709
1710 static int match_key(struct udev_rules *rules, struct token *token, const char *val)
1711 {
1712 char *key_value = rules_str(rules, token->key.value_off);
1713 char *pos;
1714 bool match = false;
1715
1716 if (val == NULL)
1717 val = "";
1718
1719 switch (token->key.glob) {
1720 case GL_PLAIN:
1721 match = (streq(key_value, val));
1722 break;
1723 case GL_GLOB:
1724 match = (fnmatch(key_value, val, 0) == 0);
1725 break;
1726 case GL_SPLIT:
1727 {
1728 const char *s;
1729 size_t len;
1730
1731 s = rules_str(rules, token->key.value_off);
1732 len = strlen(val);
1733 for (;;) {
1734 const char *next;
1735
1736 next = strchr(s, '|');
1737 if (next != NULL) {
1738 size_t matchlen = (size_t)(next - s);
1739
1740 match = (matchlen == len && strneq(s, val, matchlen));
1741 if (match)
1742 break;
1743 } else {
1744 match = (streq(s, val));
1745 break;
1746 }
1747 s = &next[1];
1748 }
1749 break;
1750 }
1751 case GL_SPLIT_GLOB:
1752 {
1753 char value[UTIL_PATH_SIZE];
1754
1755 strscpy(value, sizeof(value), rules_str(rules, token->key.value_off));
1756 key_value = value;
1757 while (key_value != NULL) {
1758 pos = strchr(key_value, '|');
1759 if (pos != NULL) {
1760 pos[0] = '\0';
1761 pos = &pos[1];
1762 }
1763 match = (fnmatch(key_value, val, 0) == 0);
1764 if (match)
1765 break;
1766 key_value = pos;
1767 }
1768 break;
1769 }
1770 case GL_SOMETHING:
1771 match = (val[0] != '\0');
1772 break;
1773 case GL_UNSET:
1774 return -1;
1775 }
1776
1777 if (match && (token->key.op == OP_MATCH))
1778 return 0;
1779 if (!match && (token->key.op == OP_NOMATCH))
1780 return 0;
1781 return -1;
1782 }
1783
1784 static int match_attr(struct udev_rules *rules, struct udev_device *dev, struct udev_event *event, struct token *cur)
1785 {
1786 const char *name;
1787 char nbuf[UTIL_NAME_SIZE];
1788 const char *value;
1789 char vbuf[UTIL_NAME_SIZE];
1790 size_t len;
1791
1792 name = rules_str(rules, cur->key.attr_off);
1793 switch (cur->key.attrsubst) {
1794 case SB_FORMAT:
1795 udev_event_apply_format(event, name, nbuf, sizeof(nbuf));
1796 name = nbuf;
1797 /* fall through */
1798 case SB_NONE:
1799 value = udev_device_get_sysattr_value(dev, name);
1800 if (value == NULL)
1801 return -1;
1802 break;
1803 case SB_SUBSYS:
1804 if (util_resolve_subsys_kernel(event->udev, name, vbuf, sizeof(vbuf), 1) != 0)
1805 return -1;
1806 value = vbuf;
1807 break;
1808 default:
1809 return -1;
1810 }
1811
1812 /* remove trailing whitespace, if not asked to match for it */
1813 len = strlen(value);
1814 if (len > 0 && isspace(value[len-1])) {
1815 const char *key_value;
1816 size_t klen;
1817
1818 key_value = rules_str(rules, cur->key.value_off);
1819 klen = strlen(key_value);
1820 if (klen > 0 && !isspace(key_value[klen-1])) {
1821 if (value != vbuf) {
1822 strscpy(vbuf, sizeof(vbuf), value);
1823 value = vbuf;
1824 }
1825 while (len > 0 && isspace(vbuf[--len]))
1826 vbuf[len] = '\0';
1827 }
1828 }
1829
1830 return match_key(rules, cur, value);
1831 }
1832
1833 enum escape_type {
1834 ESCAPE_UNSET,
1835 ESCAPE_NONE,
1836 ESCAPE_REPLACE,
1837 };
1838
1839 int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event, const sigset_t *sigmask)
1840 {
1841 struct token *cur;
1842 struct token *rule;
1843 enum escape_type esc = ESCAPE_UNSET;
1844 bool can_set_name;
1845
1846 if (rules->tokens == NULL)
1847 return -1;
1848
1849 can_set_name = ((!streq(udev_device_get_action(event->dev), "remove")) &&
1850 (major(udev_device_get_devnum(event->dev)) > 0 ||
1851 udev_device_get_ifindex(event->dev) > 0));
1852
1853 /* loop through token list, match, run actions or forward to next rule */
1854 cur = &rules->tokens[0];
1855 rule = cur;
1856 for (;;) {
1857 dump_token(rules, cur);
1858 switch (cur->type) {
1859 case TK_RULE:
1860 /* current rule */
1861 rule = cur;
1862 /* possibly skip rules which want to set NAME, SYMLINK, OWNER, GROUP, MODE */
1863 if (!can_set_name && rule->rule.can_set_name)
1864 goto nomatch;
1865 esc = ESCAPE_UNSET;
1866 break;
1867 case TK_M_ACTION:
1868 if (match_key(rules, cur, udev_device_get_action(event->dev)) != 0)
1869 goto nomatch;
1870 break;
1871 case TK_M_DEVPATH:
1872 if (match_key(rules, cur, udev_device_get_devpath(event->dev)) != 0)
1873 goto nomatch;
1874 break;
1875 case TK_M_KERNEL:
1876 if (match_key(rules, cur, udev_device_get_sysname(event->dev)) != 0)
1877 goto nomatch;
1878 break;
1879 case TK_M_DEVLINK: {
1880 struct udev_list_entry *list_entry;
1881 bool match = false;
1882
1883 udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(event->dev)) {
1884 const char *devlink;
1885
1886 devlink = udev_list_entry_get_name(list_entry) + strlen("/dev/");
1887 if (match_key(rules, cur, devlink) == 0) {
1888 match = true;
1889 break;
1890 }
1891 }
1892 if (!match)
1893 goto nomatch;
1894 break;
1895 }
1896 case TK_M_NAME:
1897 if (match_key(rules, cur, event->name) != 0)
1898 goto nomatch;
1899 break;
1900 case TK_M_ENV: {
1901 const char *key_name = rules_str(rules, cur->key.attr_off);
1902 const char *value;
1903
1904 value = udev_device_get_property_value(event->dev, key_name);
1905 if (value == NULL)
1906 value = "";
1907 if (match_key(rules, cur, value))
1908 goto nomatch;
1909 break;
1910 }
1911 case TK_M_TAG: {
1912 struct udev_list_entry *list_entry;
1913 bool match = false;
1914
1915 udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(event->dev)) {
1916 if (streq(rules_str(rules, cur->key.value_off), udev_list_entry_get_name(list_entry))) {
1917 match = true;
1918 break;
1919 }
1920 }
1921 if (!match && (cur->key.op != OP_NOMATCH))
1922 goto nomatch;
1923 break;
1924 }
1925 case TK_M_SUBSYSTEM:
1926 if (match_key(rules, cur, udev_device_get_subsystem(event->dev)) != 0)
1927 goto nomatch;
1928 break;
1929 case TK_M_DRIVER:
1930 if (match_key(rules, cur, udev_device_get_driver(event->dev)) != 0)
1931 goto nomatch;
1932 break;
1933 case TK_M_WAITFOR: {
1934 char filename[UTIL_PATH_SIZE];
1935 int found;
1936
1937 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), filename, sizeof(filename));
1938 found = (wait_for_file(event->dev, filename, 10) == 0);
1939 if (!found && (cur->key.op != OP_NOMATCH))
1940 goto nomatch;
1941 break;
1942 }
1943 case TK_M_ATTR:
1944 if (match_attr(rules, event->dev, event, cur) != 0)
1945 goto nomatch;
1946 break;
1947 case TK_M_KERNELS:
1948 case TK_M_SUBSYSTEMS:
1949 case TK_M_DRIVERS:
1950 case TK_M_ATTRS:
1951 case TK_M_TAGS: {
1952 struct token *next;
1953
1954 /* get whole sequence of parent matches */
1955 next = cur;
1956 while (next->type > TK_M_PARENTS_MIN && next->type < TK_M_PARENTS_MAX)
1957 next++;
1958
1959 /* loop over parents */
1960 event->dev_parent = event->dev;
1961 for (;;) {
1962 struct token *key;
1963
1964 /* loop over sequence of parent match keys */
1965 for (key = cur; key < next; key++ ) {
1966 dump_token(rules, key);
1967 switch(key->type) {
1968 case TK_M_KERNELS:
1969 if (match_key(rules, key, udev_device_get_sysname(event->dev_parent)) != 0)
1970 goto try_parent;
1971 break;
1972 case TK_M_SUBSYSTEMS:
1973 if (match_key(rules, key, udev_device_get_subsystem(event->dev_parent)) != 0)
1974 goto try_parent;
1975 break;
1976 case TK_M_DRIVERS:
1977 if (match_key(rules, key, udev_device_get_driver(event->dev_parent)) != 0)
1978 goto try_parent;
1979 break;
1980 case TK_M_ATTRS:
1981 if (match_attr(rules, event->dev_parent, event, key) != 0)
1982 goto try_parent;
1983 break;
1984 case TK_M_TAGS: {
1985 bool match = udev_device_has_tag(event->dev_parent, rules_str(rules, cur->key.value_off));
1986
1987 if (match && key->key.op == OP_NOMATCH)
1988 goto try_parent;
1989 if (!match && key->key.op == OP_MATCH)
1990 goto try_parent;
1991 break;
1992 }
1993 default:
1994 goto nomatch;
1995 }
1996 }
1997 break;
1998
1999 try_parent:
2000 event->dev_parent = udev_device_get_parent(event->dev_parent);
2001 if (event->dev_parent == NULL)
2002 goto nomatch;
2003 }
2004 /* move behind our sequence of parent match keys */
2005 cur = next;
2006 continue;
2007 }
2008 case TK_M_TEST: {
2009 char filename[UTIL_PATH_SIZE];
2010 struct stat statbuf;
2011 int match;
2012
2013 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), filename, sizeof(filename));
2014 if (util_resolve_subsys_kernel(event->udev, filename, filename, sizeof(filename), 0) != 0) {
2015 if (filename[0] != '/') {
2016 char tmp[UTIL_PATH_SIZE];
2017
2018 strscpy(tmp, sizeof(tmp), filename);
2019 strscpyl(filename, sizeof(filename),
2020 udev_device_get_syspath(event->dev), "/", tmp, NULL);
2021 }
2022 }
2023 attr_subst_subdir(filename, sizeof(filename));
2024
2025 match = (stat(filename, &statbuf) == 0);
2026 if (match && cur->key.mode > 0)
2027 match = ((statbuf.st_mode & cur->key.mode) > 0);
2028 if (match && cur->key.op == OP_NOMATCH)
2029 goto nomatch;
2030 if (!match && cur->key.op == OP_MATCH)
2031 goto nomatch;
2032 break;
2033 }
2034 case TK_M_EVENT_TIMEOUT:
2035 log_debug("OPTIONS event_timeout=%u\n", cur->key.event_timeout);
2036 event->timeout_usec = cur->key.event_timeout * 1000 * 1000;
2037 break;
2038 case TK_M_PROGRAM: {
2039 char program[UTIL_PATH_SIZE];
2040 char **envp;
2041 char result[UTIL_PATH_SIZE];
2042
2043 free(event->program_result);
2044 event->program_result = NULL;
2045 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), program, sizeof(program));
2046 envp = udev_device_get_properties_envp(event->dev);
2047 log_debug("PROGRAM '%s' %s:%u\n",
2048 program,
2049 rules_str(rules, rule->rule.filename_off),
2050 rule->rule.filename_line);
2051
2052 if (udev_event_spawn(event, program, envp, sigmask, result, sizeof(result)) < 0) {
2053 if (cur->key.op != OP_NOMATCH)
2054 goto nomatch;
2055 } else {
2056 int count;
2057
2058 util_remove_trailing_chars(result, '\n');
2059 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2060 count = util_replace_chars(result, UDEV_ALLOWED_CHARS_INPUT);
2061 if (count > 0)
2062 log_debug("%i character(s) replaced\n" , count);
2063 }
2064 event->program_result = strdup(result);
2065 if (cur->key.op == OP_NOMATCH)
2066 goto nomatch;
2067 }
2068 break;
2069 }
2070 case TK_M_IMPORT_FILE: {
2071 char import[UTIL_PATH_SIZE];
2072
2073 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), import, sizeof(import));
2074 if (import_file_into_properties(event->dev, import) != 0)
2075 if (cur->key.op != OP_NOMATCH)
2076 goto nomatch;
2077 break;
2078 }
2079 case TK_M_IMPORT_PROG: {
2080 char import[UTIL_PATH_SIZE];
2081
2082 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), import, sizeof(import));
2083 log_debug("IMPORT '%s' %s:%u\n",
2084 import,
2085 rules_str(rules, rule->rule.filename_off),
2086 rule->rule.filename_line);
2087
2088 if (import_program_into_properties(event, import, sigmask) != 0)
2089 if (cur->key.op != OP_NOMATCH)
2090 goto nomatch;
2091 break;
2092 }
2093 case TK_M_IMPORT_BUILTIN: {
2094 char command[UTIL_PATH_SIZE];
2095
2096 if (udev_builtin_run_once(cur->key.builtin_cmd)) {
2097 /* check if we ran already */
2098 if (event->builtin_run & (1 << cur->key.builtin_cmd)) {
2099 log_debug("IMPORT builtin skip '%s' %s:%u\n",
2100 udev_builtin_name(cur->key.builtin_cmd),
2101 rules_str(rules, rule->rule.filename_off),
2102 rule->rule.filename_line);
2103 /* return the result from earlier run */
2104 if (event->builtin_ret & (1 << cur->key.builtin_cmd))
2105 if (cur->key.op != OP_NOMATCH)
2106 goto nomatch;
2107 break;
2108 }
2109 /* mark as ran */
2110 event->builtin_run |= (1 << cur->key.builtin_cmd);
2111 }
2112
2113 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), command, sizeof(command));
2114 log_debug("IMPORT builtin '%s' %s:%u\n",
2115 udev_builtin_name(cur->key.builtin_cmd),
2116 rules_str(rules, rule->rule.filename_off),
2117 rule->rule.filename_line);
2118
2119 if (udev_builtin_run(event->dev, cur->key.builtin_cmd, command, false) != 0) {
2120 /* remember failure */
2121 log_debug("IMPORT builtin '%s' returned non-zero\n",
2122 udev_builtin_name(cur->key.builtin_cmd));
2123 event->builtin_ret |= (1 << cur->key.builtin_cmd);
2124 if (cur->key.op != OP_NOMATCH)
2125 goto nomatch;
2126 }
2127 break;
2128 }
2129 case TK_M_IMPORT_DB: {
2130 const char *key = rules_str(rules, cur->key.value_off);
2131 const char *value;
2132
2133 value = udev_device_get_property_value(event->dev_db, key);
2134 if (value != NULL) {
2135 struct udev_list_entry *entry;
2136
2137 entry = udev_device_add_property(event->dev, key, value);
2138 udev_list_entry_set_num(entry, true);
2139 } else {
2140 if (cur->key.op != OP_NOMATCH)
2141 goto nomatch;
2142 }
2143 break;
2144 }
2145 case TK_M_IMPORT_CMDLINE: {
2146 FILE *f;
2147 bool imported = false;
2148
2149 f = fopen("/proc/cmdline", "re");
2150 if (f != NULL) {
2151 char cmdline[4096];
2152
2153 if (fgets(cmdline, sizeof(cmdline), f) != NULL) {
2154 const char *key = rules_str(rules, cur->key.value_off);
2155 char *pos;
2156
2157 pos = strstr(cmdline, key);
2158 if (pos != NULL) {
2159 struct udev_list_entry *entry;
2160
2161 pos += strlen(key);
2162 if (pos[0] == '\0' || isspace(pos[0])) {
2163 /* we import simple flags as 'FLAG=1' */
2164 entry = udev_device_add_property(event->dev, key, "1");
2165 udev_list_entry_set_num(entry, true);
2166 imported = true;
2167 } else if (pos[0] == '=') {
2168 const char *value;
2169
2170 pos++;
2171 value = pos;
2172 while (pos[0] != '\0' && !isspace(pos[0]))
2173 pos++;
2174 pos[0] = '\0';
2175 entry = udev_device_add_property(event->dev, key, value);
2176 udev_list_entry_set_num(entry, true);
2177 imported = true;
2178 }
2179 }
2180 }
2181 fclose(f);
2182 }
2183 if (!imported && cur->key.op != OP_NOMATCH)
2184 goto nomatch;
2185 break;
2186 }
2187 case TK_M_IMPORT_PARENT: {
2188 char import[UTIL_PATH_SIZE];
2189
2190 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), import, sizeof(import));
2191 if (import_parent_into_properties(event->dev, import) != 0)
2192 if (cur->key.op != OP_NOMATCH)
2193 goto nomatch;
2194 break;
2195 }
2196 case TK_M_RESULT:
2197 if (match_key(rules, cur, event->program_result) != 0)
2198 goto nomatch;
2199 break;
2200 case TK_A_STRING_ESCAPE_NONE:
2201 esc = ESCAPE_NONE;
2202 break;
2203 case TK_A_STRING_ESCAPE_REPLACE:
2204 esc = ESCAPE_REPLACE;
2205 break;
2206 case TK_A_DB_PERSIST:
2207 udev_device_set_db_persist(event->dev);
2208 break;
2209 case TK_A_INOTIFY_WATCH:
2210 if (event->inotify_watch_final)
2211 break;
2212 if (cur->key.op == OP_ASSIGN_FINAL)
2213 event->inotify_watch_final = true;
2214 event->inotify_watch = cur->key.watch;
2215 break;
2216 case TK_A_DEVLINK_PRIO:
2217 udev_device_set_devlink_priority(event->dev, cur->key.devlink_prio);
2218 break;
2219 case TK_A_OWNER: {
2220 char owner[UTIL_NAME_SIZE];
2221
2222 if (event->owner_final)
2223 break;
2224 if (cur->key.op == OP_ASSIGN_FINAL)
2225 event->owner_final = true;
2226 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), owner, sizeof(owner));
2227 event->owner_set = true;
2228 event->uid = util_lookup_user(event->udev, owner);
2229 log_debug("OWNER %u %s:%u\n",
2230 event->uid,
2231 rules_str(rules, rule->rule.filename_off),
2232 rule->rule.filename_line);
2233 break;
2234 }
2235 case TK_A_GROUP: {
2236 char group[UTIL_NAME_SIZE];
2237
2238 if (event->group_final)
2239 break;
2240 if (cur->key.op == OP_ASSIGN_FINAL)
2241 event->group_final = true;
2242 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), group, sizeof(group));
2243 event->group_set = true;
2244 event->gid = util_lookup_group(event->udev, group);
2245 log_debug("GROUP %u %s:%u\n",
2246 event->gid,
2247 rules_str(rules, rule->rule.filename_off),
2248 rule->rule.filename_line);
2249 break;
2250 }
2251 case TK_A_MODE: {
2252 char mode_str[UTIL_NAME_SIZE];
2253 mode_t mode;
2254 char *endptr;
2255
2256 if (event->mode_final)
2257 break;
2258 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), mode_str, sizeof(mode_str));
2259 mode = strtol(mode_str, &endptr, 8);
2260 if (endptr[0] != '\0') {
2261 log_error("ignoring invalid mode '%s'\n", mode_str);
2262 break;
2263 }
2264 if (cur->key.op == OP_ASSIGN_FINAL)
2265 event->mode_final = true;
2266 event->mode_set = true;
2267 event->mode = mode;
2268 log_debug("MODE %#o %s:%u\n",
2269 event->mode,
2270 rules_str(rules, rule->rule.filename_off),
2271 rule->rule.filename_line);
2272 break;
2273 }
2274 case TK_A_OWNER_ID:
2275 if (event->owner_final)
2276 break;
2277 if (cur->key.op == OP_ASSIGN_FINAL)
2278 event->owner_final = true;
2279 event->owner_set = true;
2280 event->uid = cur->key.uid;
2281 log_debug("OWNER %u %s:%u\n",
2282 event->uid,
2283 rules_str(rules, rule->rule.filename_off),
2284 rule->rule.filename_line);
2285 break;
2286 case TK_A_GROUP_ID:
2287 if (event->group_final)
2288 break;
2289 if (cur->key.op == OP_ASSIGN_FINAL)
2290 event->group_final = true;
2291 event->group_set = true;
2292 event->gid = cur->key.gid;
2293 log_debug("GROUP %u %s:%u\n",
2294 event->gid,
2295 rules_str(rules, rule->rule.filename_off),
2296 rule->rule.filename_line);
2297 break;
2298 case TK_A_MODE_ID:
2299 if (event->mode_final)
2300 break;
2301 if (cur->key.op == OP_ASSIGN_FINAL)
2302 event->mode_final = true;
2303 event->mode_set = true;
2304 event->mode = cur->key.mode;
2305 log_debug("MODE %#o %s:%u\n",
2306 event->mode,
2307 rules_str(rules, rule->rule.filename_off),
2308 rule->rule.filename_line);
2309 break;
2310 case TK_A_ENV: {
2311 const char *name = rules_str(rules, cur->key.attr_off);
2312 char *value = rules_str(rules, cur->key.value_off);
2313 char value_new[UTIL_NAME_SIZE];
2314 const char *value_old = NULL;
2315 struct udev_list_entry *entry;
2316
2317 if (value[0] == '\0') {
2318 if (cur->key.op == OP_ADD)
2319 break;
2320 udev_device_add_property(event->dev, name, NULL);
2321 break;
2322 }
2323
2324 if (cur->key.op == OP_ADD)
2325 value_old = udev_device_get_property_value(event->dev, name);
2326 if (value_old) {
2327 char temp[UTIL_NAME_SIZE];
2328
2329 /* append value separated by space */
2330 udev_event_apply_format(event, value, temp, sizeof(temp));
2331 strscpyl(value_new, sizeof(value_new), value_old, " ", temp, NULL);
2332 } else
2333 udev_event_apply_format(event, value, value_new, sizeof(value_new));
2334
2335 entry = udev_device_add_property(event->dev, name, value_new);
2336 /* store in db, skip private keys */
2337 if (name[0] != '.')
2338 udev_list_entry_set_num(entry, true);
2339 break;
2340 }
2341 case TK_A_TAG: {
2342 char tag[UTIL_PATH_SIZE];
2343 const char *p;
2344
2345 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), tag, sizeof(tag));
2346 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2347 udev_device_cleanup_tags_list(event->dev);
2348 for (p = tag; *p != '\0'; p++) {
2349 if ((*p >= 'a' && *p <= 'z') ||
2350 (*p >= 'A' && *p <= 'Z') ||
2351 (*p >= '0' && *p <= '9') ||
2352 *p == '-' || *p == '_')
2353 continue;
2354 log_error("ignoring invalid tag name '%s'\n", tag);
2355 break;
2356 }
2357 udev_device_add_tag(event->dev, tag);
2358 break;
2359 }
2360 case TK_A_NAME: {
2361 const char *name = rules_str(rules, cur->key.value_off);
2362
2363 char name_str[UTIL_PATH_SIZE];
2364 int count;
2365
2366 if (event->name_final)
2367 break;
2368 if (cur->key.op == OP_ASSIGN_FINAL)
2369 event->name_final = true;
2370 udev_event_apply_format(event, name, name_str, sizeof(name_str));
2371 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2372 count = util_replace_chars(name_str, "/");
2373 if (count > 0)
2374 log_debug("%i character(s) replaced\n", count);
2375 }
2376 if (major(udev_device_get_devnum(event->dev)) &&
2377 (!streq(name_str, udev_device_get_devnode(event->dev) + strlen("/dev/")))) {
2378 log_error("NAME=\"%s\" ignored, kernel device nodes "
2379 "can not be renamed; please fix it in %s:%u\n", name,
2380 rules_str(rules, rule->rule.filename_off), rule->rule.filename_line);
2381 break;
2382 }
2383 free(event->name);
2384 event->name = strdup(name_str);
2385 log_debug("NAME '%s' %s:%u\n",
2386 event->name,
2387 rules_str(rules, rule->rule.filename_off),
2388 rule->rule.filename_line);
2389 break;
2390 }
2391 case TK_A_DEVLINK: {
2392 char temp[UTIL_PATH_SIZE];
2393 char filename[UTIL_PATH_SIZE];
2394 char *pos, *next;
2395 int count = 0;
2396
2397 if (event->devlink_final)
2398 break;
2399 if (major(udev_device_get_devnum(event->dev)) == 0)
2400 break;
2401 if (cur->key.op == OP_ASSIGN_FINAL)
2402 event->devlink_final = true;
2403 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2404 udev_device_cleanup_devlinks_list(event->dev);
2405
2406 /* allow multiple symlinks separated by spaces */
2407 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), temp, sizeof(temp));
2408 if (esc == ESCAPE_UNSET)
2409 count = util_replace_chars(temp, "/ ");
2410 else if (esc == ESCAPE_REPLACE)
2411 count = util_replace_chars(temp, "/");
2412 if (count > 0)
2413 log_debug("%i character(s) replaced\n" , count);
2414 pos = temp;
2415 while (isspace(pos[0]))
2416 pos++;
2417 next = strchr(pos, ' ');
2418 while (next != NULL) {
2419 next[0] = '\0';
2420 log_debug("LINK '%s' %s:%u\n", pos,
2421 rules_str(rules, rule->rule.filename_off), rule->rule.filename_line);
2422 strscpyl(filename, sizeof(filename), "/dev/", pos, NULL);
2423 udev_device_add_devlink(event->dev, filename);
2424 while (isspace(next[1]))
2425 next++;
2426 pos = &next[1];
2427 next = strchr(pos, ' ');
2428 }
2429 if (pos[0] != '\0') {
2430 log_debug("LINK '%s' %s:%u\n", pos,
2431 rules_str(rules, rule->rule.filename_off), rule->rule.filename_line);
2432 strscpyl(filename, sizeof(filename), "/dev/", pos, NULL);
2433 udev_device_add_devlink(event->dev, filename);
2434 }
2435 break;
2436 }
2437 case TK_A_ATTR: {
2438 const char *key_name = rules_str(rules, cur->key.attr_off);
2439 char attr[UTIL_PATH_SIZE];
2440 char value[UTIL_NAME_SIZE];
2441 FILE *f;
2442
2443 if (util_resolve_subsys_kernel(event->udev, key_name, attr, sizeof(attr), 0) != 0)
2444 strscpyl(attr, sizeof(attr), udev_device_get_syspath(event->dev), "/", key_name, NULL);
2445 attr_subst_subdir(attr, sizeof(attr));
2446
2447 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), value, sizeof(value));
2448 log_debug("ATTR '%s' writing '%s' %s:%u\n", attr, value,
2449 rules_str(rules, rule->rule.filename_off),
2450 rule->rule.filename_line);
2451 f = fopen(attr, "we");
2452 if (f != NULL) {
2453 if (fprintf(f, "%s", value) <= 0)
2454 log_error("error writing ATTR{%s}: %m\n", attr);
2455 fclose(f);
2456 } else {
2457 log_error("error opening ATTR{%s} for writing: %m\n", attr);
2458 }
2459 break;
2460 }
2461 case TK_A_RUN_BUILTIN:
2462 case TK_A_RUN_PROGRAM: {
2463 struct udev_list_entry *entry;
2464
2465 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2466 udev_list_cleanup(&event->run_list);
2467 log_debug("RUN '%s' %s:%u\n",
2468 rules_str(rules, cur->key.value_off),
2469 rules_str(rules, rule->rule.filename_off),
2470 rule->rule.filename_line);
2471 entry = udev_list_entry_add(&event->run_list, rules_str(rules, cur->key.value_off), NULL);
2472 udev_list_entry_set_num(entry, cur->key.builtin_cmd);
2473 break;
2474 }
2475 case TK_A_GOTO:
2476 if (cur->key.rule_goto == 0)
2477 break;
2478 cur = &rules->tokens[cur->key.rule_goto];
2479 continue;
2480 case TK_END:
2481 return 0;
2482
2483 case TK_M_PARENTS_MIN:
2484 case TK_M_PARENTS_MAX:
2485 case TK_M_MAX:
2486 case TK_UNSET:
2487 log_error("wrong type %u\n", cur->type);
2488 goto nomatch;
2489 }
2490
2491 cur++;
2492 continue;
2493 nomatch:
2494 /* fast-forward to next rule */
2495 cur = rule + rule->rule.token_count;
2496 }
2497 }
2498
2499 void udev_rules_apply_static_dev_perms(struct udev_rules *rules)
2500 {
2501 struct token *cur;
2502 struct token *rule;
2503 uid_t uid = 0;
2504 gid_t gid = 0;
2505 mode_t mode = 0;
2506
2507 if (rules->tokens == NULL)
2508 return;
2509
2510 cur = &rules->tokens[0];
2511 rule = cur;
2512 for (;;) {
2513 switch (cur->type) {
2514 case TK_RULE:
2515 /* current rule */
2516 rule = cur;
2517
2518 /* skip rules without a static_node tag */
2519 if (!rule->rule.has_static_node)
2520 goto next;
2521
2522 uid = 0;
2523 gid = 0;
2524 mode = 0;
2525 break;
2526 case TK_A_OWNER_ID:
2527 uid = cur->key.uid;
2528 break;
2529 case TK_A_GROUP_ID:
2530 gid = cur->key.gid;
2531 break;
2532 case TK_A_MODE_ID:
2533 mode = cur->key.mode;
2534 break;
2535 case TK_A_STATIC_NODE: {
2536 char filename[UTIL_PATH_SIZE];
2537 struct stat stats;
2538
2539 /* we assure, that the permissions tokens are sorted before the static token */
2540 if (mode == 0 && uid == 0 && gid == 0)
2541 goto next;
2542 strscpyl(filename, sizeof(filename), "/dev/", rules_str(rules, cur->key.value_off), NULL);
2543 if (stat(filename, &stats) != 0)
2544 goto next;
2545 if (!S_ISBLK(stats.st_mode) && !S_ISCHR(stats.st_mode))
2546 goto next;
2547 if (mode == 0) {
2548 if (gid > 0)
2549 mode = 0660;
2550 else
2551 mode = 0600;
2552 }
2553 if (mode != (stats.st_mode & 01777)) {
2554 chmod(filename, mode);
2555 log_debug("chmod '%s' %#o\n", filename, mode);
2556 }
2557
2558 if ((uid != 0 && uid != stats.st_uid) || (gid != 0 && gid != stats.st_gid)) {
2559 chown(filename, uid, gid);
2560 log_debug("chown '%s' %u %u\n", filename, uid, gid);
2561 }
2562
2563 utimensat(AT_FDCWD, filename, NULL, 0);
2564 break;
2565 }
2566 case TK_END:
2567 return;
2568 }
2569
2570 cur++;
2571 continue;
2572 next:
2573 /* fast-forward to next rule */
2574 cur = rule + rule->rule.token_count;
2575 continue;
2576 }
2577 }
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