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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 #include "strv.h"
37 #include "util.h"
38
39 #define PREALLOC_TOKEN 2048
40
41 struct uid_gid {
42 unsigned int name_off;
43 union {
44 uid_t uid;
45 gid_t gid;
46 };
47 };
48
49 static const char* const rules_dirs[] = {
50 "/etc/udev/rules.d",
51 "/run/udev/rules.d",
52 UDEVLIBEXECDIR "/rules.d",
53 NULL};
54
55 struct udev_rules {
56 struct udev *udev;
57 usec_t dirs_ts_usec;
58 int resolve_names;
59
60 /* every key in the rules file becomes a token */
61 struct token *tokens;
62 unsigned int token_cur;
63 unsigned int token_max;
64
65 /* all key strings are copied and de-duplicated in a single continuous string buffer */
66 struct strbuf *strbuf;
67
68 /* during rule parsing, uid/gid lookup results are cached */
69 struct uid_gid *uids;
70 unsigned int uids_cur;
71 unsigned int uids_max;
72 struct uid_gid *gids;
73 unsigned int gids_cur;
74 unsigned int gids_max;
75 };
76
77 static char *rules_str(struct udev_rules *rules, unsigned int off) {
78 return rules->strbuf->buf + off;
79 }
80
81 static unsigned int rules_add_string(struct udev_rules *rules, const char *s) {
82 return strbuf_add_string(rules->strbuf, s, strlen(s));
83 }
84
85 /* KEY=="", KEY!="", KEY+="", KEY="", KEY:="" */
86 enum operation_type {
87 OP_UNSET,
88
89 OP_MATCH,
90 OP_NOMATCH,
91 OP_MATCH_MAX,
92
93 OP_ADD,
94 OP_ASSIGN,
95 OP_ASSIGN_FINAL,
96 };
97
98 enum string_glob_type {
99 GL_UNSET,
100 GL_PLAIN, /* no special chars */
101 GL_GLOB, /* shell globs ?,*,[] */
102 GL_SPLIT, /* multi-value A|B */
103 GL_SPLIT_GLOB, /* multi-value with glob A*|B* */
104 GL_SOMETHING, /* commonly used "?*" */
105 };
106
107 enum string_subst_type {
108 SB_UNSET,
109 SB_NONE,
110 SB_FORMAT,
111 SB_SUBSYS,
112 };
113
114 /* tokens of a rule are sorted/handled in this order */
115 enum token_type {
116 TK_UNSET,
117 TK_RULE,
118
119 TK_M_ACTION, /* val */
120 TK_M_DEVPATH, /* val */
121 TK_M_KERNEL, /* val */
122 TK_M_DEVLINK, /* val */
123 TK_M_NAME, /* val */
124 TK_M_ENV, /* val, attr */
125 TK_M_TAG, /* val */
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_TAGS, /* val */
137 TK_M_PARENTS_MAX,
138
139 TK_M_TEST, /* val, mode_t */
140 TK_M_EVENT_TIMEOUT, /* int */
141 TK_M_PROGRAM, /* val */
142 TK_M_IMPORT_FILE, /* val */
143 TK_M_IMPORT_PROG, /* val */
144 TK_M_IMPORT_BUILTIN, /* val */
145 TK_M_IMPORT_DB, /* val */
146 TK_M_IMPORT_CMDLINE, /* val */
147 TK_M_IMPORT_PARENT, /* val */
148 TK_M_RESULT, /* val */
149 TK_M_MAX,
150
151 TK_A_STRING_ESCAPE_NONE,
152 TK_A_STRING_ESCAPE_REPLACE,
153 TK_A_DB_PERSIST,
154 TK_A_INOTIFY_WATCH, /* int */
155 TK_A_DEVLINK_PRIO, /* int */
156 TK_A_OWNER, /* val */
157 TK_A_GROUP, /* val */
158 TK_A_MODE, /* val */
159 TK_A_OWNER_ID, /* uid_t */
160 TK_A_GROUP_ID, /* gid_t */
161 TK_A_MODE_ID, /* mode_t */
162 TK_A_TAG, /* val */
163 TK_A_STATIC_NODE, /* val */
164 TK_A_SECLABEL, /* val, attr */
165 TK_A_ENV, /* val, attr */
166 TK_A_NAME, /* val */
167 TK_A_DEVLINK, /* val */
168 TK_A_ATTR, /* val, attr */
169 TK_A_RUN_BUILTIN, /* val, bool */
170 TK_A_RUN_PROGRAM, /* val, bool */
171 TK_A_GOTO, /* size_t */
172
173 TK_END,
174 };
175
176 /* we try to pack stuff in a way that we take only 12 bytes per token */
177 struct token {
178 union {
179 unsigned char type; /* same in rule and key */
180 struct {
181 enum token_type type:8;
182 bool can_set_name:1;
183 bool has_static_node:1;
184 unsigned int unused:6;
185 unsigned short token_count;
186 unsigned int label_off;
187 unsigned short filename_off;
188 unsigned short filename_line;
189 } rule;
190 struct {
191 enum token_type type:8;
192 enum operation_type op:8;
193 enum string_glob_type glob:8;
194 enum string_subst_type subst:4;
195 enum string_subst_type attrsubst:4;
196 unsigned int value_off;
197 union {
198 unsigned int attr_off;
199 unsigned int rule_goto;
200 mode_t mode;
201 uid_t uid;
202 gid_t gid;
203 int devlink_prio;
204 int event_timeout;
205 int watch;
206 enum udev_builtin_cmd builtin_cmd;
207 };
208 } key;
209 };
210 };
211
212 #define MAX_TK 64
213 struct rule_tmp {
214 struct udev_rules *rules;
215 struct token rule;
216 struct token token[MAX_TK];
217 unsigned int token_cur;
218 };
219
220 #ifdef DEBUG
221 static const char *operation_str(enum operation_type type)
222 {
223 static const char *operation_strs[] = {
224 [OP_UNSET] = "UNSET",
225 [OP_MATCH] = "match",
226 [OP_NOMATCH] = "nomatch",
227 [OP_MATCH_MAX] = "MATCH_MAX",
228
229 [OP_ADD] = "add",
230 [OP_ASSIGN] = "assign",
231 [OP_ASSIGN_FINAL] = "assign-final",
232 } ;
233
234 return operation_strs[type];
235 }
236
237 static const char *string_glob_str(enum string_glob_type type)
238 {
239 static const char *string_glob_strs[] = {
240 [GL_UNSET] = "UNSET",
241 [GL_PLAIN] = "plain",
242 [GL_GLOB] = "glob",
243 [GL_SPLIT] = "split",
244 [GL_SPLIT_GLOB] = "split-glob",
245 [GL_SOMETHING] = "split-glob",
246 };
247
248 return string_glob_strs[type];
249 }
250
251 static const char *token_str(enum token_type type)
252 {
253 static const char *token_strs[] = {
254 [TK_UNSET] = "UNSET",
255 [TK_RULE] = "RULE",
256
257 [TK_M_ACTION] = "M ACTION",
258 [TK_M_DEVPATH] = "M DEVPATH",
259 [TK_M_KERNEL] = "M KERNEL",
260 [TK_M_DEVLINK] = "M DEVLINK",
261 [TK_M_NAME] = "M NAME",
262 [TK_M_ENV] = "M ENV",
263 [TK_M_TAG] = "M TAG",
264 [TK_M_SUBSYSTEM] = "M SUBSYSTEM",
265 [TK_M_DRIVER] = "M DRIVER",
266 [TK_M_WAITFOR] = "M WAITFOR",
267 [TK_M_ATTR] = "M ATTR",
268
269 [TK_M_PARENTS_MIN] = "M PARENTS_MIN",
270 [TK_M_KERNELS] = "M KERNELS",
271 [TK_M_SUBSYSTEMS] = "M SUBSYSTEMS",
272 [TK_M_DRIVERS] = "M DRIVERS",
273 [TK_M_ATTRS] = "M ATTRS",
274 [TK_M_TAGS] = "M TAGS",
275 [TK_M_PARENTS_MAX] = "M PARENTS_MAX",
276
277 [TK_M_TEST] = "M TEST",
278 [TK_M_EVENT_TIMEOUT] = "M EVENT_TIMEOUT",
279 [TK_M_PROGRAM] = "M PROGRAM",
280 [TK_M_IMPORT_FILE] = "M IMPORT_FILE",
281 [TK_M_IMPORT_PROG] = "M IMPORT_PROG",
282 [TK_M_IMPORT_BUILTIN] = "M IMPORT_BUILTIN",
283 [TK_M_IMPORT_DB] = "M IMPORT_DB",
284 [TK_M_IMPORT_CMDLINE] = "M IMPORT_CMDLINE",
285 [TK_M_IMPORT_PARENT] = "M IMPORT_PARENT",
286 [TK_M_RESULT] = "M RESULT",
287 [TK_M_MAX] = "M MAX",
288
289 [TK_A_STRING_ESCAPE_NONE] = "A STRING_ESCAPE_NONE",
290 [TK_A_STRING_ESCAPE_REPLACE] = "A STRING_ESCAPE_REPLACE",
291 [TK_A_DB_PERSIST] = "A DB_PERSIST",
292 [TK_A_INOTIFY_WATCH] = "A INOTIFY_WATCH",
293 [TK_A_DEVLINK_PRIO] = "A DEVLINK_PRIO",
294 [TK_A_OWNER] = "A OWNER",
295 [TK_A_GROUP] = "A GROUP",
296 [TK_A_MODE] = "A MODE",
297 [TK_A_OWNER_ID] = "A OWNER_ID",
298 [TK_A_GROUP_ID] = "A GROUP_ID",
299 [TK_A_STATIC_NODE] = "A STATIC_NODE",
300 [TK_A_SECLABEL] = "A SECLABEL",
301 [TK_A_MODE_ID] = "A MODE_ID",
302 [TK_A_ENV] = "A ENV",
303 [TK_A_TAG] = "A ENV",
304 [TK_A_NAME] = "A NAME",
305 [TK_A_DEVLINK] = "A DEVLINK",
306 [TK_A_ATTR] = "A ATTR",
307 [TK_A_RUN_BUILTIN] = "A RUN_BUILTIN",
308 [TK_A_RUN_PROGRAM] = "A RUN_PROGRAM",
309 [TK_A_GOTO] = "A GOTO",
310
311 [TK_END] = "END",
312 };
313
314 return token_strs[type];
315 }
316
317 static void dump_token(struct udev_rules *rules, struct token *token)
318 {
319 enum token_type type = token->type;
320 enum operation_type op = token->key.op;
321 enum string_glob_type glob = token->key.glob;
322 const char *value = str(rules, token->key.value_off);
323 const char *attr = &rules->buf[token->key.attr_off];
324
325 switch (type) {
326 case TK_RULE:
327 {
328 const char *tks_ptr = (char *)rules->tokens;
329 const char *tk_ptr = (char *)token;
330 unsigned int idx = (tk_ptr - tks_ptr) / sizeof(struct token);
331
332 log_debug("* RULE %s:%u, token: %u, count: %u, label: '%s'",
333 &rules->buf[token->rule.filename_off], token->rule.filename_line,
334 idx, token->rule.token_count,
335 &rules->buf[token->rule.label_off]);
336 break;
337 }
338 case TK_M_ACTION:
339 case TK_M_DEVPATH:
340 case TK_M_KERNEL:
341 case TK_M_SUBSYSTEM:
342 case TK_M_DRIVER:
343 case TK_M_WAITFOR:
344 case TK_M_DEVLINK:
345 case TK_M_NAME:
346 case TK_M_KERNELS:
347 case TK_M_SUBSYSTEMS:
348 case TK_M_DRIVERS:
349 case TK_M_TAGS:
350 case TK_M_PROGRAM:
351 case TK_M_IMPORT_FILE:
352 case TK_M_IMPORT_PROG:
353 case TK_M_IMPORT_DB:
354 case TK_M_IMPORT_CMDLINE:
355 case TK_M_IMPORT_PARENT:
356 case TK_M_RESULT:
357 case TK_A_NAME:
358 case TK_A_DEVLINK:
359 case TK_A_OWNER:
360 case TK_A_GROUP:
361 case TK_A_MODE:
362 case TK_A_RUN_BUILTIN:
363 case TK_A_RUN_PROGRAM:
364 log_debug("%s %s '%s'(%s)",
365 token_str(type), operation_str(op), value, string_glob_str(glob));
366 break;
367 case TK_M_IMPORT_BUILTIN:
368 log_debug("%s %i '%s'", token_str(type), token->key.builtin_cmd, value);
369 break;
370 case TK_M_ATTR:
371 case TK_M_ATTRS:
372 case TK_M_ENV:
373 case TK_A_ATTR:
374 case TK_A_ENV:
375 log_debug("%s %s '%s' '%s'(%s)",
376 token_str(type), operation_str(op), attr, value, string_glob_str(glob));
377 break;
378 case TK_M_TAG:
379 case TK_A_TAG:
380 log_debug("%s %s '%s'", token_str(type), operation_str(op), value);
381 break;
382 case TK_A_STRING_ESCAPE_NONE:
383 case TK_A_STRING_ESCAPE_REPLACE:
384 case TK_A_DB_PERSIST:
385 log_debug("%s", token_str(type));
386 break;
387 case TK_M_TEST:
388 log_debug("%s %s '%s'(%s) %#o",
389 token_str(type), operation_str(op), value, string_glob_str(glob), token->key.mode);
390 break;
391 case TK_A_INOTIFY_WATCH:
392 log_debug("%s %u", token_str(type), token->key.watch);
393 break;
394 case TK_A_DEVLINK_PRIO:
395 log_debug("%s %u", token_str(type), token->key.devlink_prio);
396 break;
397 case TK_A_OWNER_ID:
398 log_debug("%s %s %u", token_str(type), operation_str(op), token->key.uid);
399 break;
400 case TK_A_GROUP_ID:
401 log_debug("%s %s %u", token_str(type), operation_str(op), token->key.gid);
402 break;
403 case TK_A_MODE_ID:
404 log_debug("%s %s %#o", token_str(type), operation_str(op), token->key.mode);
405 break;
406 case TK_A_STATIC_NODE:
407 log_debug("%s '%s'", token_str(type), value);
408 break;
409 case TK_A_SECLABEL:
410 log_debug("%s %s '%s' '%s'", token_str(type), operation_str(op), attr, value);
411 break;
412 case TK_M_EVENT_TIMEOUT:
413 log_debug("%s %u", token_str(type), token->key.event_timeout);
414 break;
415 case TK_A_GOTO:
416 log_debug("%s '%s' %u", token_str(type), value, token->key.rule_goto);
417 break;
418 case TK_END:
419 log_debug("* %s", token_str(type));
420 break;
421 case TK_M_PARENTS_MIN:
422 case TK_M_PARENTS_MAX:
423 case TK_M_MAX:
424 case TK_UNSET:
425 log_debug("unknown type %u", type);
426 break;
427 }
428 }
429
430 static void dump_rules(struct udev_rules *rules)
431 {
432 unsigned int i;
433
434 log_debug("dumping %u (%zu bytes) tokens, %u (%zu bytes) strings",
435 rules->token_cur,
436 rules->token_cur * sizeof(struct token),
437 rules->buf_count,
438 rules->buf_cur);
439 for (i = 0; i < rules->token_cur; i++)
440 dump_token(rules, &rules->tokens[i]);
441 }
442 #else
443 static inline const char *operation_str(enum operation_type type) { return NULL; }
444 static inline const char *token_str(enum token_type type) { return NULL; }
445 static inline void dump_token(struct udev_rules *rules, struct token *token) {}
446 static inline void dump_rules(struct udev_rules *rules) {}
447 #endif /* DEBUG */
448
449 static int add_token(struct udev_rules *rules, struct token *token)
450 {
451 /* grow buffer if needed */
452 if (rules->token_cur+1 >= rules->token_max) {
453 struct token *tokens;
454 unsigned int add;
455
456 /* double the buffer size */
457 add = rules->token_max;
458 if (add < 8)
459 add = 8;
460
461 tokens = realloc(rules->tokens, (rules->token_max + add ) * sizeof(struct token));
462 if (tokens == NULL)
463 return -1;
464 rules->tokens = tokens;
465 rules->token_max += add;
466 }
467 memcpy(&rules->tokens[rules->token_cur], token, sizeof(struct token));
468 rules->token_cur++;
469 return 0;
470 }
471
472 static uid_t add_uid(struct udev_rules *rules, const char *owner)
473 {
474 unsigned int i;
475 uid_t uid;
476 unsigned int off;
477
478 /* lookup, if we know it already */
479 for (i = 0; i < rules->uids_cur; i++) {
480 off = rules->uids[i].name_off;
481 if (streq(rules_str(rules, off), owner)) {
482 uid = rules->uids[i].uid;
483 return uid;
484 }
485 }
486 uid = util_lookup_user(rules->udev, owner);
487
488 /* grow buffer if needed */
489 if (rules->uids_cur+1 >= rules->uids_max) {
490 struct uid_gid *uids;
491 unsigned int add;
492
493 /* double the buffer size */
494 add = rules->uids_max;
495 if (add < 1)
496 add = 8;
497
498 uids = realloc(rules->uids, (rules->uids_max + add ) * sizeof(struct uid_gid));
499 if (uids == NULL)
500 return uid;
501 rules->uids = uids;
502 rules->uids_max += add;
503 }
504 rules->uids[rules->uids_cur].uid = uid;
505 off = rules_add_string(rules, owner);
506 if (off <= 0)
507 return uid;
508 rules->uids[rules->uids_cur].name_off = off;
509 rules->uids_cur++;
510 return uid;
511 }
512
513 static gid_t add_gid(struct udev_rules *rules, const char *group)
514 {
515 unsigned int i;
516 gid_t gid;
517 unsigned int off;
518
519 /* lookup, if we know it already */
520 for (i = 0; i < rules->gids_cur; i++) {
521 off = rules->gids[i].name_off;
522 if (streq(rules_str(rules, off), group)) {
523 gid = rules->gids[i].gid;
524 return gid;
525 }
526 }
527 gid = util_lookup_group(rules->udev, group);
528
529 /* grow buffer if needed */
530 if (rules->gids_cur+1 >= rules->gids_max) {
531 struct uid_gid *gids;
532 unsigned int add;
533
534 /* double the buffer size */
535 add = rules->gids_max;
536 if (add < 1)
537 add = 8;
538
539 gids = realloc(rules->gids, (rules->gids_max + add ) * sizeof(struct uid_gid));
540 if (gids == NULL)
541 return gid;
542 rules->gids = gids;
543 rules->gids_max += add;
544 }
545 rules->gids[rules->gids_cur].gid = gid;
546 off = rules_add_string(rules, group);
547 if (off <= 0)
548 return gid;
549 rules->gids[rules->gids_cur].name_off = off;
550 rules->gids_cur++;
551 return gid;
552 }
553
554 static int import_property_from_string(struct udev_device *dev, char *line)
555 {
556 char *key;
557 char *val;
558 size_t len;
559 struct udev_list_entry *entry;
560
561 /* find key */
562 key = line;
563 while (isspace(key[0]))
564 key++;
565
566 /* comment or empty line */
567 if (key[0] == '#' || key[0] == '\0')
568 return -1;
569
570 /* split key/value */
571 val = strchr(key, '=');
572 if (val == NULL)
573 return -1;
574 val[0] = '\0';
575 val++;
576
577 /* find value */
578 while (isspace(val[0]))
579 val++;
580
581 /* terminate key */
582 len = strlen(key);
583 if (len == 0)
584 return -1;
585 while (isspace(key[len-1]))
586 len--;
587 key[len] = '\0';
588
589 /* terminate value */
590 len = strlen(val);
591 if (len == 0)
592 return -1;
593 while (isspace(val[len-1]))
594 len--;
595 val[len] = '\0';
596
597 if (len == 0)
598 return -1;
599
600 /* unquote */
601 if (val[0] == '"' || val[0] == '\'') {
602 if (val[len-1] != val[0]) {
603 log_debug("inconsistent quoting: '%s', skip", line);
604 return -1;
605 }
606 val[len-1] = '\0';
607 val++;
608 }
609
610 entry = udev_device_add_property(dev, key, val);
611 /* store in db, skip private keys */
612 if (key[0] != '.')
613 udev_list_entry_set_num(entry, true);
614
615 return 0;
616 }
617
618 static int import_file_into_properties(struct udev_device *dev, const char *filename)
619 {
620 FILE *f;
621 char line[UTIL_LINE_SIZE];
622
623 f = fopen(filename, "re");
624 if (f == NULL)
625 return -1;
626 while (fgets(line, sizeof(line), f) != NULL)
627 import_property_from_string(dev, line);
628 fclose(f);
629 return 0;
630 }
631
632 static int import_program_into_properties(struct udev_event *event, const char *program, const sigset_t *sigmask)
633 {
634 struct udev_device *dev = event->dev;
635 char **envp;
636 char result[UTIL_LINE_SIZE];
637 char *line;
638 int err;
639
640 envp = udev_device_get_properties_envp(dev);
641 err = udev_event_spawn(event, program, envp, sigmask, result, sizeof(result));
642 if (err < 0)
643 return err;
644
645 line = result;
646 while (line != NULL) {
647 char *pos;
648
649 pos = strchr(line, '\n');
650 if (pos != NULL) {
651 pos[0] = '\0';
652 pos = &pos[1];
653 }
654 import_property_from_string(dev, line);
655 line = pos;
656 }
657 return 0;
658 }
659
660 static int import_parent_into_properties(struct udev_device *dev, const char *filter)
661 {
662 struct udev_device *dev_parent;
663 struct udev_list_entry *list_entry;
664
665 dev_parent = udev_device_get_parent(dev);
666 if (dev_parent == NULL)
667 return -1;
668
669 udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(dev_parent)) {
670 const char *key = udev_list_entry_get_name(list_entry);
671 const char *val = udev_list_entry_get_value(list_entry);
672
673 if (fnmatch(filter, key, 0) == 0) {
674 struct udev_list_entry *entry;
675
676 entry = udev_device_add_property(dev, key, val);
677 /* store in db, skip private keys */
678 if (key[0] != '.')
679 udev_list_entry_set_num(entry, true);
680 }
681 }
682 return 0;
683 }
684
685 #define WAIT_LOOP_PER_SECOND 50
686 static int wait_for_file(struct udev_device *dev, const char *file, int timeout)
687 {
688 char filepath[UTIL_PATH_SIZE];
689 char devicepath[UTIL_PATH_SIZE];
690 struct stat stats;
691 int loop = timeout * WAIT_LOOP_PER_SECOND;
692
693 /* a relative path is a device attribute */
694 devicepath[0] = '\0';
695 if (file[0] != '/') {
696 strscpyl(devicepath, sizeof(devicepath), udev_device_get_syspath(dev), NULL);
697 strscpyl(filepath, sizeof(filepath), devicepath, "/", file, NULL);
698 file = filepath;
699 }
700
701 while (--loop) {
702 const struct timespec duration = { 0, 1000 * 1000 * 1000 / WAIT_LOOP_PER_SECOND };
703
704 /* lookup file */
705 if (stat(file, &stats) == 0) {
706 log_debug("file '%s' appeared after %i loops", file, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
707 return 0;
708 }
709 /* make sure, the device did not disappear in the meantime */
710 if (devicepath[0] != '\0' && stat(devicepath, &stats) != 0) {
711 log_debug("device disappeared while waiting for '%s'", file);
712 return -2;
713 }
714 log_debug("wait for '%s' for %i mseconds", file, 1000 / WAIT_LOOP_PER_SECOND);
715 nanosleep(&duration, NULL);
716 }
717 log_debug("waiting for '%s' failed", file);
718 return -1;
719 }
720
721 static int attr_subst_subdir(char *attr, size_t len)
722 {
723 bool found = false;
724
725 if (strstr(attr, "/*/")) {
726 char *pos;
727 char dirname[UTIL_PATH_SIZE];
728 const char *tail;
729 DIR *dir;
730
731 strscpy(dirname, sizeof(dirname), attr);
732 pos = strstr(dirname, "/*/");
733 if (pos == NULL)
734 return -1;
735 pos[0] = '\0';
736 tail = &pos[2];
737 dir = opendir(dirname);
738 if (dir != NULL) {
739 struct dirent *dent;
740
741 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
742 struct stat stats;
743
744 if (dent->d_name[0] == '.')
745 continue;
746 strscpyl(attr, len, dirname, "/", dent->d_name, tail, NULL);
747 if (stat(attr, &stats) == 0) {
748 found = true;
749 break;
750 }
751 }
752 closedir(dir);
753 }
754 }
755
756 return found;
757 }
758
759 static int get_key(struct udev *udev, char **line, char **key, enum operation_type *op, char **value)
760 {
761 char *linepos;
762 char *temp;
763
764 linepos = *line;
765 if (linepos == NULL || linepos[0] == '\0')
766 return -1;
767
768 /* skip whitespace */
769 while (isspace(linepos[0]) || linepos[0] == ',')
770 linepos++;
771
772 /* get the key */
773 if (linepos[0] == '\0')
774 return -1;
775 *key = linepos;
776
777 for (;;) {
778 linepos++;
779 if (linepos[0] == '\0')
780 return -1;
781 if (isspace(linepos[0]))
782 break;
783 if (linepos[0] == '=')
784 break;
785 if ((linepos[0] == '+') || (linepos[0] == '!') || (linepos[0] == ':'))
786 if (linepos[1] == '=')
787 break;
788 }
789
790 /* remember end of key */
791 temp = linepos;
792
793 /* skip whitespace after key */
794 while (isspace(linepos[0]))
795 linepos++;
796 if (linepos[0] == '\0')
797 return -1;
798
799 /* get operation type */
800 if (linepos[0] == '=' && linepos[1] == '=') {
801 *op = OP_MATCH;
802 linepos += 2;
803 } else if (linepos[0] == '!' && linepos[1] == '=') {
804 *op = OP_NOMATCH;
805 linepos += 2;
806 } else if (linepos[0] == '+' && linepos[1] == '=') {
807 *op = OP_ADD;
808 linepos += 2;
809 } else if (linepos[0] == '=') {
810 *op = OP_ASSIGN;
811 linepos++;
812 } else if (linepos[0] == ':' && linepos[1] == '=') {
813 *op = OP_ASSIGN_FINAL;
814 linepos += 2;
815 } else
816 return -1;
817
818 /* terminate key */
819 temp[0] = '\0';
820
821 /* skip whitespace after operator */
822 while (isspace(linepos[0]))
823 linepos++;
824 if (linepos[0] == '\0')
825 return -1;
826
827 /* get the value */
828 if (linepos[0] == '"')
829 linepos++;
830 else
831 return -1;
832 *value = linepos;
833
834 /* terminate */
835 temp = strchr(linepos, '"');
836 if (!temp)
837 return -1;
838 temp[0] = '\0';
839 temp++;
840
841 /* move line to next key */
842 *line = temp;
843 return 0;
844 }
845
846 /* extract possible KEY{attr} */
847 static const char *get_key_attribute(struct udev *udev, char *str)
848 {
849 char *pos;
850 char *attr;
851
852 attr = strchr(str, '{');
853 if (attr != NULL) {
854 attr++;
855 pos = strchr(attr, '}');
856 if (pos == NULL) {
857 log_error("missing closing brace for format");
858 return NULL;
859 }
860 pos[0] = '\0';
861 return attr;
862 }
863 return NULL;
864 }
865
866 static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
867 enum operation_type op,
868 const char *value, const void *data)
869 {
870 struct token *token = &rule_tmp->token[rule_tmp->token_cur];
871 const char *attr = NULL;
872
873 memset(token, 0x00, sizeof(struct token));
874
875 switch (type) {
876 case TK_M_ACTION:
877 case TK_M_DEVPATH:
878 case TK_M_KERNEL:
879 case TK_M_SUBSYSTEM:
880 case TK_M_DRIVER:
881 case TK_M_WAITFOR:
882 case TK_M_DEVLINK:
883 case TK_M_NAME:
884 case TK_M_KERNELS:
885 case TK_M_SUBSYSTEMS:
886 case TK_M_DRIVERS:
887 case TK_M_TAGS:
888 case TK_M_PROGRAM:
889 case TK_M_IMPORT_FILE:
890 case TK_M_IMPORT_PROG:
891 case TK_M_IMPORT_DB:
892 case TK_M_IMPORT_CMDLINE:
893 case TK_M_IMPORT_PARENT:
894 case TK_M_RESULT:
895 case TK_A_OWNER:
896 case TK_A_GROUP:
897 case TK_A_MODE:
898 case TK_A_DEVLINK:
899 case TK_A_NAME:
900 case TK_A_GOTO:
901 case TK_M_TAG:
902 case TK_A_TAG:
903 token->key.value_off = rules_add_string(rule_tmp->rules, value);
904 break;
905 case TK_M_IMPORT_BUILTIN:
906 token->key.value_off = rules_add_string(rule_tmp->rules, value);
907 token->key.builtin_cmd = *(enum udev_builtin_cmd *)data;
908 break;
909 case TK_M_ENV:
910 case TK_M_ATTR:
911 case TK_M_ATTRS:
912 case TK_A_ATTR:
913 case TK_A_ENV:
914 case TK_A_SECLABEL:
915 attr = data;
916 token->key.value_off = rules_add_string(rule_tmp->rules, value);
917 token->key.attr_off = rules_add_string(rule_tmp->rules, attr);
918 break;
919 case TK_M_TEST:
920 token->key.value_off = rules_add_string(rule_tmp->rules, value);
921 if (data != NULL)
922 token->key.mode = *(mode_t *)data;
923 break;
924 case TK_A_STRING_ESCAPE_NONE:
925 case TK_A_STRING_ESCAPE_REPLACE:
926 case TK_A_DB_PERSIST:
927 break;
928 case TK_A_RUN_BUILTIN:
929 case TK_A_RUN_PROGRAM:
930 token->key.builtin_cmd = *(enum udev_builtin_cmd *)data;
931 token->key.value_off = rules_add_string(rule_tmp->rules, value);
932 break;
933 case TK_A_INOTIFY_WATCH:
934 case TK_A_DEVLINK_PRIO:
935 token->key.devlink_prio = *(int *)data;
936 break;
937 case TK_A_OWNER_ID:
938 token->key.uid = *(uid_t *)data;
939 break;
940 case TK_A_GROUP_ID:
941 token->key.gid = *(gid_t *)data;
942 break;
943 case TK_A_MODE_ID:
944 token->key.mode = *(mode_t *)data;
945 break;
946 case TK_A_STATIC_NODE:
947 token->key.value_off = rules_add_string(rule_tmp->rules, value);
948 break;
949 case TK_M_EVENT_TIMEOUT:
950 token->key.event_timeout = *(int *)data;
951 break;
952 case TK_RULE:
953 case TK_M_PARENTS_MIN:
954 case TK_M_PARENTS_MAX:
955 case TK_M_MAX:
956 case TK_END:
957 case TK_UNSET:
958 log_error("wrong type %u", type);
959 return -1;
960 }
961
962 if (value != NULL && type < TK_M_MAX) {
963 /* check if we need to split or call fnmatch() while matching rules */
964 enum string_glob_type glob;
965 int has_split;
966 int has_glob;
967
968 has_split = (strchr(value, '|') != NULL);
969 has_glob = string_is_glob(value);
970 if (has_split && has_glob) {
971 glob = GL_SPLIT_GLOB;
972 } else if (has_split) {
973 glob = GL_SPLIT;
974 } else if (has_glob) {
975 if (streq(value, "?*"))
976 glob = GL_SOMETHING;
977 else
978 glob = GL_GLOB;
979 } else {
980 glob = GL_PLAIN;
981 }
982 token->key.glob = glob;
983 }
984
985 if (value != NULL && type > TK_M_MAX) {
986 /* check if assigned value has substitution chars */
987 if (value[0] == '[')
988 token->key.subst = SB_SUBSYS;
989 else if (strchr(value, '%') != NULL || strchr(value, '$') != NULL)
990 token->key.subst = SB_FORMAT;
991 else
992 token->key.subst = SB_NONE;
993 }
994
995 if (attr != NULL) {
996 /* check if property/attribut name has substitution chars */
997 if (attr[0] == '[')
998 token->key.attrsubst = SB_SUBSYS;
999 else if (strchr(attr, '%') != NULL || strchr(attr, '$') != NULL)
1000 token->key.attrsubst = SB_FORMAT;
1001 else
1002 token->key.attrsubst = SB_NONE;
1003 }
1004
1005 token->key.type = type;
1006 token->key.op = op;
1007 rule_tmp->token_cur++;
1008 if (rule_tmp->token_cur >= ELEMENTSOF(rule_tmp->token)) {
1009 log_error("temporary rule array too small");
1010 return -1;
1011 }
1012 return 0;
1013 }
1014
1015 static int sort_token(struct udev_rules *rules, struct rule_tmp *rule_tmp)
1016 {
1017 unsigned int i;
1018 unsigned int start = 0;
1019 unsigned int end = rule_tmp->token_cur;
1020
1021 for (i = 0; i < rule_tmp->token_cur; i++) {
1022 enum token_type next_val = TK_UNSET;
1023 unsigned int next_idx = 0;
1024 unsigned int j;
1025
1026 /* find smallest value */
1027 for (j = start; j < end; j++) {
1028 if (rule_tmp->token[j].type == TK_UNSET)
1029 continue;
1030 if (next_val == TK_UNSET || rule_tmp->token[j].type < next_val) {
1031 next_val = rule_tmp->token[j].type;
1032 next_idx = j;
1033 }
1034 }
1035
1036 /* add token and mark done */
1037 if (add_token(rules, &rule_tmp->token[next_idx]) != 0)
1038 return -1;
1039 rule_tmp->token[next_idx].type = TK_UNSET;
1040
1041 /* shrink range */
1042 if (next_idx == start)
1043 start++;
1044 if (next_idx+1 == end)
1045 end--;
1046 }
1047 return 0;
1048 }
1049
1050 static int add_rule(struct udev_rules *rules, char *line,
1051 const char *filename, unsigned int filename_off, unsigned int lineno)
1052 {
1053 char *linepos;
1054 const char *attr;
1055 struct rule_tmp rule_tmp;
1056
1057 memset(&rule_tmp, 0x00, sizeof(struct rule_tmp));
1058 rule_tmp.rules = rules;
1059 rule_tmp.rule.type = TK_RULE;
1060 /* the offset in the rule is limited to unsigned short */
1061 if (filename_off < USHRT_MAX)
1062 rule_tmp.rule.rule.filename_off = filename_off;
1063 rule_tmp.rule.rule.filename_line = lineno;
1064
1065 linepos = line;
1066 for (;;) {
1067 char *key;
1068 char *value;
1069 enum operation_type op;
1070
1071 if (get_key(rules->udev, &linepos, &key, &op, &value) != 0) {
1072 /* Avoid erroring on trailing whitespace. This is probably rare
1073 * so save the work for the error case instead of always trying
1074 * to strip the trailing whitespace with strstrip(). */
1075 while (isblank(*linepos))
1076 linepos++;
1077
1078 /* If we aren't at the end of the line, this is a parsing error.
1079 * Make a best effort to describe where the problem is. */
1080 if (*linepos != '\n') {
1081 char buf[2] = {linepos[1]};
1082 _cleanup_free_ char *tmp;
1083
1084 tmp = cescape(buf);
1085 log_error("invalid key/value pair in file %s on line %u,"
1086 "starting at character %tu ('%s')\n",
1087 filename, lineno, linepos - line + 1, tmp);
1088 if (linepos[1] == '#')
1089 log_error("hint: comments can only start at beginning of line");
1090 }
1091 break;
1092 }
1093
1094 if (streq(key, "ACTION")) {
1095 if (op > OP_MATCH_MAX) {
1096 log_error("invalid ACTION operation");
1097 goto invalid;
1098 }
1099 rule_add_key(&rule_tmp, TK_M_ACTION, op, value, NULL);
1100 continue;
1101 }
1102
1103 if (streq(key, "DEVPATH")) {
1104 if (op > OP_MATCH_MAX) {
1105 log_error("invalid DEVPATH operation");
1106 goto invalid;
1107 }
1108 rule_add_key(&rule_tmp, TK_M_DEVPATH, op, value, NULL);
1109 continue;
1110 }
1111
1112 if (streq(key, "KERNEL")) {
1113 if (op > OP_MATCH_MAX) {
1114 log_error("invalid KERNEL operation");
1115 goto invalid;
1116 }
1117 rule_add_key(&rule_tmp, TK_M_KERNEL, op, value, NULL);
1118 continue;
1119 }
1120
1121 if (streq(key, "SUBSYSTEM")) {
1122 if (op > OP_MATCH_MAX) {
1123 log_error("invalid SUBSYSTEM operation");
1124 goto invalid;
1125 }
1126 /* bus, class, subsystem events should all be the same */
1127 if (streq(value, "subsystem") ||
1128 streq(value, "bus") ||
1129 streq(value, "class")) {
1130 if (streq(value, "bus") || streq(value, "class"))
1131 log_error("'%s' must be specified as 'subsystem' "
1132 "please fix it in %s:%u", value, filename, lineno);
1133 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, "subsystem|class|bus", NULL);
1134 } else
1135 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, value, NULL);
1136 continue;
1137 }
1138
1139 if (streq(key, "DRIVER")) {
1140 if (op > OP_MATCH_MAX) {
1141 log_error("invalid DRIVER operation");
1142 goto invalid;
1143 }
1144 rule_add_key(&rule_tmp, TK_M_DRIVER, op, value, NULL);
1145 continue;
1146 }
1147
1148 if (startswith(key, "ATTR{")) {
1149 attr = get_key_attribute(rules->udev, key + sizeof("ATTR")-1);
1150 if (attr == NULL) {
1151 log_error("error parsing ATTR attribute");
1152 goto invalid;
1153 }
1154 if (op < OP_MATCH_MAX) {
1155 rule_add_key(&rule_tmp, TK_M_ATTR, op, value, attr);
1156 } else {
1157 rule_add_key(&rule_tmp, TK_A_ATTR, op, value, attr);
1158 }
1159 continue;
1160 }
1161
1162 if (startswith(key, "SECLABEL{")) {
1163 attr = get_key_attribute(rules->udev, key + sizeof("SECLABEL")-1);
1164 if (!attr) {
1165 log_error("error parsing SECLABEL attribute");
1166 goto invalid;
1167 }
1168
1169 rule_add_key(&rule_tmp, TK_A_SECLABEL, op, value, attr);
1170 continue;
1171 }
1172
1173 if (streq(key, "KERNELS")) {
1174 if (op > OP_MATCH_MAX) {
1175 log_error("invalid KERNELS operation");
1176 goto invalid;
1177 }
1178 rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1179 continue;
1180 }
1181
1182 if (streq(key, "SUBSYSTEMS")) {
1183 if (op > OP_MATCH_MAX) {
1184 log_error("invalid SUBSYSTEMS operation");
1185 goto invalid;
1186 }
1187 rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1188 continue;
1189 }
1190
1191 if (streq(key, "DRIVERS")) {
1192 if (op > OP_MATCH_MAX) {
1193 log_error("invalid DRIVERS operation");
1194 goto invalid;
1195 }
1196 rule_add_key(&rule_tmp, TK_M_DRIVERS, op, value, NULL);
1197 continue;
1198 }
1199
1200 if (startswith(key, "ATTRS{")) {
1201 if (op > OP_MATCH_MAX) {
1202 log_error("invalid ATTRS operation");
1203 goto invalid;
1204 }
1205 attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);
1206 if (attr == NULL) {
1207 log_error("error parsing ATTRS attribute");
1208 goto invalid;
1209 }
1210 if (startswith(attr, "device/"))
1211 log_error("the 'device' link may not be available in a future kernel, "
1212 "please fix it in %s:%u", filename, lineno);
1213 else if (strstr(attr, "../") != NULL)
1214 log_error("do not reference parent sysfs directories directly, "
1215 "it may break with a future kernel, please fix it in %s:%u", filename, lineno);
1216 rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1217 continue;
1218 }
1219
1220 if (streq(key, "TAGS")) {
1221 if (op > OP_MATCH_MAX) {
1222 log_error("invalid TAGS operation");
1223 goto invalid;
1224 }
1225 rule_add_key(&rule_tmp, TK_M_TAGS, op, value, NULL);
1226 continue;
1227 }
1228
1229 if (startswith(key, "ENV{")) {
1230 attr = get_key_attribute(rules->udev, key + sizeof("ENV")-1);
1231 if (attr == NULL) {
1232 log_error("error parsing ENV attribute");
1233 goto invalid;
1234 }
1235 if (op < OP_MATCH_MAX) {
1236 if (rule_add_key(&rule_tmp, TK_M_ENV, op, value, attr) != 0)
1237 goto invalid;
1238 } else {
1239 static const char *blacklist[] = {
1240 "ACTION",
1241 "SUBSYSTEM",
1242 "DEVTYPE",
1243 "MAJOR",
1244 "MINOR",
1245 "DRIVER",
1246 "IFINDEX",
1247 "DEVNAME",
1248 "DEVLINKS",
1249 "DEVPATH",
1250 "TAGS",
1251 };
1252 unsigned int i;
1253
1254 for (i = 0; i < ELEMENTSOF(blacklist); i++) {
1255 if (!streq(attr, blacklist[i]))
1256 continue;
1257 log_error("invalid ENV attribute, '%s' can not be set %s:%u", attr, filename, lineno);
1258 goto invalid;
1259 }
1260 if (rule_add_key(&rule_tmp, TK_A_ENV, op, value, attr) != 0)
1261 goto invalid;
1262 }
1263 continue;
1264 }
1265
1266 if (streq(key, "TAG")) {
1267 if (op < OP_MATCH_MAX)
1268 rule_add_key(&rule_tmp, TK_M_TAG, op, value, NULL);
1269 else
1270 rule_add_key(&rule_tmp, TK_A_TAG, op, value, NULL);
1271 continue;
1272 }
1273
1274 if (streq(key, "PROGRAM")) {
1275 rule_add_key(&rule_tmp, TK_M_PROGRAM, op, value, NULL);
1276 continue;
1277 }
1278
1279 if (streq(key, "RESULT")) {
1280 if (op > OP_MATCH_MAX) {
1281 log_error("invalid RESULT operation");
1282 goto invalid;
1283 }
1284 rule_add_key(&rule_tmp, TK_M_RESULT, op, value, NULL);
1285 continue;
1286 }
1287
1288 if (startswith(key, "IMPORT")) {
1289 attr = get_key_attribute(rules->udev, key + sizeof("IMPORT")-1);
1290 if (attr == NULL) {
1291 log_error("IMPORT{} type missing, ignoring IMPORT %s:%u", filename, lineno);
1292 continue;
1293 }
1294 if (streq(attr, "program")) {
1295 /* find known built-in command */
1296 if (value[0] != '/') {
1297 enum udev_builtin_cmd cmd;
1298
1299 cmd = udev_builtin_lookup(value);
1300 if (cmd < UDEV_BUILTIN_MAX) {
1301 log_debug("IMPORT found builtin '%s', replacing %s:%u",
1302 value, filename, lineno);
1303 rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, value, &cmd);
1304 continue;
1305 }
1306 }
1307 rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1308 } else if (streq(attr, "builtin")) {
1309 enum udev_builtin_cmd cmd = udev_builtin_lookup(value);
1310
1311 if (cmd < UDEV_BUILTIN_MAX)
1312 rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, value, &cmd);
1313 else
1314 log_error("IMPORT{builtin}: '%s' unknown %s:%u", value, filename, lineno);
1315 } else if (streq(attr, "file")) {
1316 rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1317 } else if (streq(attr, "db")) {
1318 rule_add_key(&rule_tmp, TK_M_IMPORT_DB, op, value, NULL);
1319 } else if (streq(attr, "cmdline")) {
1320 rule_add_key(&rule_tmp, TK_M_IMPORT_CMDLINE, op, value, NULL);
1321 } else if (streq(attr, "parent")) {
1322 rule_add_key(&rule_tmp, TK_M_IMPORT_PARENT, op, value, NULL);
1323 } else
1324 log_error("IMPORT{} unknown type, ignoring IMPORT %s:%u", filename, lineno);
1325 continue;
1326 }
1327
1328 if (startswith(key, "TEST")) {
1329 mode_t mode = 0;
1330
1331 if (op > OP_MATCH_MAX) {
1332 log_error("invalid TEST operation");
1333 goto invalid;
1334 }
1335 attr = get_key_attribute(rules->udev, key + sizeof("TEST")-1);
1336 if (attr != NULL) {
1337 mode = strtol(attr, NULL, 8);
1338 rule_add_key(&rule_tmp, TK_M_TEST, op, value, &mode);
1339 } else {
1340 rule_add_key(&rule_tmp, TK_M_TEST, op, value, NULL);
1341 }
1342 continue;
1343 }
1344
1345 if (startswith(key, "RUN")) {
1346 attr = get_key_attribute(rules->udev, key + sizeof("RUN")-1);
1347 if (attr == NULL)
1348 attr = "program";
1349
1350 if (streq(attr, "builtin")) {
1351 enum udev_builtin_cmd cmd = udev_builtin_lookup(value);
1352
1353 if (cmd < UDEV_BUILTIN_MAX)
1354 rule_add_key(&rule_tmp, TK_A_RUN_BUILTIN, op, value, &cmd);
1355 else
1356 log_error("IMPORT{builtin}: '%s' unknown %s:%u", value, filename, lineno);
1357 } else if (streq(attr, "program")) {
1358 enum udev_builtin_cmd cmd = UDEV_BUILTIN_MAX;
1359
1360 rule_add_key(&rule_tmp, TK_A_RUN_PROGRAM, op, value, &cmd);
1361 } else {
1362 log_error("RUN{} unknown type, ignoring RUN %s:%u", filename, lineno);
1363 }
1364
1365 continue;
1366 }
1367
1368 if (streq(key, "WAIT_FOR") || streq(key, "WAIT_FOR_SYSFS")) {
1369 rule_add_key(&rule_tmp, TK_M_WAITFOR, 0, value, NULL);
1370 continue;
1371 }
1372
1373 if (streq(key, "LABEL")) {
1374 rule_tmp.rule.rule.label_off = rules_add_string(rules, value);
1375 continue;
1376 }
1377
1378 if (streq(key, "GOTO")) {
1379 rule_add_key(&rule_tmp, TK_A_GOTO, 0, value, NULL);
1380 continue;
1381 }
1382
1383 if (startswith(key, "NAME")) {
1384 if (op < OP_MATCH_MAX) {
1385 rule_add_key(&rule_tmp, TK_M_NAME, op, value, NULL);
1386 } else {
1387 if (streq(value, "%k")) {
1388 log_error("NAME=\"%%k\" is ignored, because it breaks kernel supplied names, "
1389 "please remove it from %s:%u\n", filename, lineno);
1390 continue;
1391 }
1392 if (value[0] == '\0') {
1393 log_debug("NAME=\"\" is ignored, because udev will not delete any device nodes, "
1394 "please remove it from %s:%u\n", filename, lineno);
1395 continue;
1396 }
1397 rule_add_key(&rule_tmp, TK_A_NAME, op, value, NULL);
1398 }
1399 rule_tmp.rule.rule.can_set_name = true;
1400 continue;
1401 }
1402
1403 if (streq(key, "SYMLINK")) {
1404 if (op < OP_MATCH_MAX)
1405 rule_add_key(&rule_tmp, TK_M_DEVLINK, op, value, NULL);
1406 else
1407 rule_add_key(&rule_tmp, TK_A_DEVLINK, op, value, NULL);
1408 rule_tmp.rule.rule.can_set_name = true;
1409 continue;
1410 }
1411
1412 if (streq(key, "OWNER")) {
1413 uid_t uid;
1414 char *endptr;
1415
1416 uid = strtoul(value, &endptr, 10);
1417 if (endptr[0] == '\0') {
1418 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1419 } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1420 uid = add_uid(rules, value);
1421 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1422 } else if (rules->resolve_names >= 0) {
1423 rule_add_key(&rule_tmp, TK_A_OWNER, op, value, NULL);
1424 }
1425 rule_tmp.rule.rule.can_set_name = true;
1426 continue;
1427 }
1428
1429 if (streq(key, "GROUP")) {
1430 gid_t gid;
1431 char *endptr;
1432
1433 gid = strtoul(value, &endptr, 10);
1434 if (endptr[0] == '\0') {
1435 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1436 } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1437 gid = add_gid(rules, value);
1438 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1439 } else if (rules->resolve_names >= 0) {
1440 rule_add_key(&rule_tmp, TK_A_GROUP, op, value, NULL);
1441 }
1442 rule_tmp.rule.rule.can_set_name = true;
1443 continue;
1444 }
1445
1446 if (streq(key, "MODE")) {
1447 mode_t mode;
1448 char *endptr;
1449
1450 mode = strtol(value, &endptr, 8);
1451 if (endptr[0] == '\0')
1452 rule_add_key(&rule_tmp, TK_A_MODE_ID, op, NULL, &mode);
1453 else
1454 rule_add_key(&rule_tmp, TK_A_MODE, op, value, NULL);
1455 rule_tmp.rule.rule.can_set_name = true;
1456 continue;
1457 }
1458
1459 if (streq(key, "OPTIONS")) {
1460 const char *pos;
1461
1462 pos = strstr(value, "link_priority=");
1463 if (pos != NULL) {
1464 int prio = atoi(&pos[strlen("link_priority=")]);
1465
1466 rule_add_key(&rule_tmp, TK_A_DEVLINK_PRIO, op, NULL, &prio);
1467 }
1468
1469 pos = strstr(value, "event_timeout=");
1470 if (pos != NULL) {
1471 int tout = atoi(&pos[strlen("event_timeout=")]);
1472
1473 rule_add_key(&rule_tmp, TK_M_EVENT_TIMEOUT, op, NULL, &tout);
1474 }
1475
1476 pos = strstr(value, "string_escape=");
1477 if (pos != NULL) {
1478 pos = &pos[strlen("string_escape=")];
1479 if (startswith(pos, "none"))
1480 rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_NONE, op, NULL, NULL);
1481 else if (startswith(pos, "replace"))
1482 rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_REPLACE, op, NULL, NULL);
1483 }
1484
1485 pos = strstr(value, "db_persist");
1486 if (pos != NULL)
1487 rule_add_key(&rule_tmp, TK_A_DB_PERSIST, op, NULL, NULL);
1488
1489 pos = strstr(value, "nowatch");
1490 if (pos != NULL) {
1491 const int off = 0;
1492
1493 rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &off);
1494 } else {
1495 pos = strstr(value, "watch");
1496 if (pos != NULL) {
1497 const int on = 1;
1498
1499 rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &on);
1500 }
1501 }
1502
1503 pos = strstr(value, "static_node=");
1504 if (pos != NULL) {
1505 rule_add_key(&rule_tmp, TK_A_STATIC_NODE, op, &pos[strlen("static_node=")], NULL);
1506 rule_tmp.rule.rule.has_static_node = true;
1507 }
1508
1509 continue;
1510 }
1511
1512 log_error("unknown key '%s' in %s:%u", key, filename, lineno);
1513 goto invalid;
1514 }
1515
1516 /* add rule token */
1517 rule_tmp.rule.rule.token_count = 1 + rule_tmp.token_cur;
1518 if (add_token(rules, &rule_tmp.rule) != 0)
1519 goto invalid;
1520
1521 /* add tokens to list, sorted by type */
1522 if (sort_token(rules, &rule_tmp) != 0)
1523 goto invalid;
1524
1525 return 0;
1526 invalid:
1527 log_error("invalid rule '%s:%u'", filename, lineno);
1528 return -1;
1529 }
1530
1531 static int parse_file(struct udev_rules *rules, const char *filename)
1532 {
1533 FILE *f;
1534 unsigned int first_token;
1535 unsigned int filename_off;
1536 char line[UTIL_LINE_SIZE];
1537 int line_nr = 0;
1538 unsigned int i;
1539
1540 if (null_or_empty_path(filename)) {
1541 log_debug("skip empty file: %s", filename);
1542 return 0;
1543 }
1544 log_debug("read rules file: %s", filename);
1545
1546 f = fopen(filename, "re");
1547 if (f == NULL)
1548 return -1;
1549
1550 first_token = rules->token_cur;
1551 filename_off = rules_add_string(rules, filename);
1552
1553 while (fgets(line, sizeof(line), f) != NULL) {
1554 char *key;
1555 size_t len;
1556
1557 /* skip whitespace */
1558 line_nr++;
1559 key = line;
1560 while (isspace(key[0]))
1561 key++;
1562
1563 /* comment */
1564 if (key[0] == '#')
1565 continue;
1566
1567 len = strlen(line);
1568 if (len < 3)
1569 continue;
1570
1571 /* continue reading if backslash+newline is found */
1572 while (line[len-2] == '\\') {
1573 if (fgets(&line[len-2], (sizeof(line)-len)+2, f) == NULL)
1574 break;
1575 if (strlen(&line[len-2]) < 2)
1576 break;
1577 line_nr++;
1578 len = strlen(line);
1579 }
1580
1581 if (len+1 >= sizeof(line)) {
1582 log_error("line too long '%s':%u, ignored", filename, line_nr);
1583 continue;
1584 }
1585 add_rule(rules, key, filename, filename_off, line_nr);
1586 }
1587 fclose(f);
1588
1589 /* link GOTOs to LABEL rules in this file to be able to fast-forward */
1590 for (i = first_token+1; i < rules->token_cur; i++) {
1591 if (rules->tokens[i].type == TK_A_GOTO) {
1592 char *label = rules_str(rules, rules->tokens[i].key.value_off);
1593 unsigned int j;
1594
1595 for (j = i+1; j < rules->token_cur; j++) {
1596 if (rules->tokens[j].type != TK_RULE)
1597 continue;
1598 if (rules->tokens[j].rule.label_off == 0)
1599 continue;
1600 if (!streq(label, rules_str(rules, rules->tokens[j].rule.label_off)))
1601 continue;
1602 rules->tokens[i].key.rule_goto = j;
1603 break;
1604 }
1605 if (rules->tokens[i].key.rule_goto == 0)
1606 log_error("GOTO '%s' has no matching label in: '%s'", label, filename);
1607 }
1608 }
1609 return 0;
1610 }
1611
1612 struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
1613 {
1614 struct udev_rules *rules;
1615 struct udev_list file_list;
1616 struct token end_token;
1617 char **files, **f;
1618 int r;
1619
1620 rules = calloc(1, sizeof(struct udev_rules));
1621 if (rules == NULL)
1622 return NULL;
1623 rules->udev = udev;
1624 rules->resolve_names = resolve_names;
1625 udev_list_init(udev, &file_list, true);
1626
1627 /* init token array and string buffer */
1628 rules->tokens = malloc(PREALLOC_TOKEN * sizeof(struct token));
1629 if (rules->tokens == NULL)
1630 return udev_rules_unref(rules);
1631 rules->token_max = PREALLOC_TOKEN;
1632
1633 rules->strbuf = strbuf_new();
1634 if (!rules->strbuf)
1635 return udev_rules_unref(rules);
1636
1637 udev_rules_check_timestamp(rules);
1638
1639 r = conf_files_list_strv(&files, ".rules", NULL, rules_dirs);
1640 if (r < 0) {
1641 log_error("failed to enumerate rules files: %s", strerror(-r));
1642 return udev_rules_unref(rules);
1643 }
1644
1645 /*
1646 * The offset value in the rules strct is limited; add all
1647 * rules file names to the beginning of the string buffer.
1648 */
1649 STRV_FOREACH(f, files)
1650 rules_add_string(rules, *f);
1651
1652 STRV_FOREACH(f, files)
1653 parse_file(rules, *f);
1654
1655 strv_free(files);
1656
1657 memset(&end_token, 0x00, sizeof(struct token));
1658 end_token.type = TK_END;
1659 add_token(rules, &end_token);
1660 log_debug("rules contain %zu bytes tokens (%u * %zu bytes), %zu bytes strings",
1661 rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->strbuf->len);
1662
1663 /* cleanup temporary strbuf data */
1664 log_debug("%zu strings (%zu bytes), %zu de-duplicated (%zu bytes), %zu trie nodes used",
1665 rules->strbuf->in_count, rules->strbuf->in_len,
1666 rules->strbuf->dedup_count, rules->strbuf->dedup_len, rules->strbuf->nodes_count);
1667 strbuf_complete(rules->strbuf);
1668
1669 /* cleanup uid/gid cache */
1670 free(rules->uids);
1671 rules->uids = NULL;
1672 rules->uids_cur = 0;
1673 rules->uids_max = 0;
1674 free(rules->gids);
1675 rules->gids = NULL;
1676 rules->gids_cur = 0;
1677 rules->gids_max = 0;
1678
1679 dump_rules(rules);
1680 return rules;
1681 }
1682
1683 struct udev_rules *udev_rules_unref(struct udev_rules *rules)
1684 {
1685 if (rules == NULL)
1686 return NULL;
1687 free(rules->tokens);
1688 strbuf_cleanup(rules->strbuf);
1689 free(rules->uids);
1690 free(rules->gids);
1691 free(rules);
1692 return NULL;
1693 }
1694
1695 bool udev_rules_check_timestamp(struct udev_rules *rules)
1696 {
1697 if (!rules)
1698 return false;
1699
1700 return paths_check_timestamp(rules_dirs, &rules->dirs_ts_usec, true);
1701 }
1702
1703 static int match_key(struct udev_rules *rules, struct token *token, const char *val)
1704 {
1705 char *key_value = rules_str(rules, token->key.value_off);
1706 char *pos;
1707 bool match = false;
1708
1709 if (val == NULL)
1710 val = "";
1711
1712 switch (token->key.glob) {
1713 case GL_PLAIN:
1714 match = (streq(key_value, val));
1715 break;
1716 case GL_GLOB:
1717 match = (fnmatch(key_value, val, 0) == 0);
1718 break;
1719 case GL_SPLIT:
1720 {
1721 const char *s;
1722 size_t len;
1723
1724 s = rules_str(rules, token->key.value_off);
1725 len = strlen(val);
1726 for (;;) {
1727 const char *next;
1728
1729 next = strchr(s, '|');
1730 if (next != NULL) {
1731 size_t matchlen = (size_t)(next - s);
1732
1733 match = (matchlen == len && strneq(s, val, matchlen));
1734 if (match)
1735 break;
1736 } else {
1737 match = (streq(s, val));
1738 break;
1739 }
1740 s = &next[1];
1741 }
1742 break;
1743 }
1744 case GL_SPLIT_GLOB:
1745 {
1746 char value[UTIL_PATH_SIZE];
1747
1748 strscpy(value, sizeof(value), rules_str(rules, token->key.value_off));
1749 key_value = value;
1750 while (key_value != NULL) {
1751 pos = strchr(key_value, '|');
1752 if (pos != NULL) {
1753 pos[0] = '\0';
1754 pos = &pos[1];
1755 }
1756 match = (fnmatch(key_value, val, 0) == 0);
1757 if (match)
1758 break;
1759 key_value = pos;
1760 }
1761 break;
1762 }
1763 case GL_SOMETHING:
1764 match = (val[0] != '\0');
1765 break;
1766 case GL_UNSET:
1767 return -1;
1768 }
1769
1770 if (match && (token->key.op == OP_MATCH))
1771 return 0;
1772 if (!match && (token->key.op == OP_NOMATCH))
1773 return 0;
1774 return -1;
1775 }
1776
1777 static int match_attr(struct udev_rules *rules, struct udev_device *dev, struct udev_event *event, struct token *cur)
1778 {
1779 const char *name;
1780 char nbuf[UTIL_NAME_SIZE];
1781 const char *value;
1782 char vbuf[UTIL_NAME_SIZE];
1783 size_t len;
1784
1785 name = rules_str(rules, cur->key.attr_off);
1786 switch (cur->key.attrsubst) {
1787 case SB_FORMAT:
1788 udev_event_apply_format(event, name, nbuf, sizeof(nbuf));
1789 name = nbuf;
1790 /* fall through */
1791 case SB_NONE:
1792 value = udev_device_get_sysattr_value(dev, name);
1793 if (value == NULL)
1794 return -1;
1795 break;
1796 case SB_SUBSYS:
1797 if (util_resolve_subsys_kernel(event->udev, name, vbuf, sizeof(vbuf), 1) != 0)
1798 return -1;
1799 value = vbuf;
1800 break;
1801 default:
1802 return -1;
1803 }
1804
1805 /* remove trailing whitespace, if not asked to match for it */
1806 len = strlen(value);
1807 if (len > 0 && isspace(value[len-1])) {
1808 const char *key_value;
1809 size_t klen;
1810
1811 key_value = rules_str(rules, cur->key.value_off);
1812 klen = strlen(key_value);
1813 if (klen > 0 && !isspace(key_value[klen-1])) {
1814 if (value != vbuf) {
1815 strscpy(vbuf, sizeof(vbuf), value);
1816 value = vbuf;
1817 }
1818 while (len > 0 && isspace(vbuf[--len]))
1819 vbuf[len] = '\0';
1820 }
1821 }
1822
1823 return match_key(rules, cur, value);
1824 }
1825
1826 enum escape_type {
1827 ESCAPE_UNSET,
1828 ESCAPE_NONE,
1829 ESCAPE_REPLACE,
1830 };
1831
1832 int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event, const sigset_t *sigmask)
1833 {
1834 struct token *cur;
1835 struct token *rule;
1836 enum escape_type esc = ESCAPE_UNSET;
1837 bool can_set_name;
1838
1839 if (rules->tokens == NULL)
1840 return -1;
1841
1842 can_set_name = ((!streq(udev_device_get_action(event->dev), "remove")) &&
1843 (major(udev_device_get_devnum(event->dev)) > 0 ||
1844 udev_device_get_ifindex(event->dev) > 0));
1845
1846 /* loop through token list, match, run actions or forward to next rule */
1847 cur = &rules->tokens[0];
1848 rule = cur;
1849 for (;;) {
1850 dump_token(rules, cur);
1851 switch (cur->type) {
1852 case TK_RULE:
1853 /* current rule */
1854 rule = cur;
1855 /* possibly skip rules which want to set NAME, SYMLINK, OWNER, GROUP, MODE */
1856 if (!can_set_name && rule->rule.can_set_name)
1857 goto nomatch;
1858 esc = ESCAPE_UNSET;
1859 break;
1860 case TK_M_ACTION:
1861 if (match_key(rules, cur, udev_device_get_action(event->dev)) != 0)
1862 goto nomatch;
1863 break;
1864 case TK_M_DEVPATH:
1865 if (match_key(rules, cur, udev_device_get_devpath(event->dev)) != 0)
1866 goto nomatch;
1867 break;
1868 case TK_M_KERNEL:
1869 if (match_key(rules, cur, udev_device_get_sysname(event->dev)) != 0)
1870 goto nomatch;
1871 break;
1872 case TK_M_DEVLINK: {
1873 struct udev_list_entry *list_entry;
1874 bool match = false;
1875
1876 udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(event->dev)) {
1877 const char *devlink;
1878
1879 devlink = udev_list_entry_get_name(list_entry) + strlen("/dev/");
1880 if (match_key(rules, cur, devlink) == 0) {
1881 match = true;
1882 break;
1883 }
1884 }
1885 if (!match)
1886 goto nomatch;
1887 break;
1888 }
1889 case TK_M_NAME:
1890 if (match_key(rules, cur, event->name) != 0)
1891 goto nomatch;
1892 break;
1893 case TK_M_ENV: {
1894 const char *key_name = rules_str(rules, cur->key.attr_off);
1895 const char *value;
1896
1897 value = udev_device_get_property_value(event->dev, key_name);
1898 if (value == NULL)
1899 value = "";
1900 if (match_key(rules, cur, value))
1901 goto nomatch;
1902 break;
1903 }
1904 case TK_M_TAG: {
1905 struct udev_list_entry *list_entry;
1906 bool match = false;
1907
1908 udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(event->dev)) {
1909 if (streq(rules_str(rules, cur->key.value_off), udev_list_entry_get_name(list_entry))) {
1910 match = true;
1911 break;
1912 }
1913 }
1914 if (!match && (cur->key.op != OP_NOMATCH))
1915 goto nomatch;
1916 break;
1917 }
1918 case TK_M_SUBSYSTEM:
1919 if (match_key(rules, cur, udev_device_get_subsystem(event->dev)) != 0)
1920 goto nomatch;
1921 break;
1922 case TK_M_DRIVER:
1923 if (match_key(rules, cur, udev_device_get_driver(event->dev)) != 0)
1924 goto nomatch;
1925 break;
1926 case TK_M_WAITFOR: {
1927 char filename[UTIL_PATH_SIZE];
1928 int found;
1929
1930 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), filename, sizeof(filename));
1931 found = (wait_for_file(event->dev, filename, 10) == 0);
1932 if (!found && (cur->key.op != OP_NOMATCH))
1933 goto nomatch;
1934 break;
1935 }
1936 case TK_M_ATTR:
1937 if (match_attr(rules, event->dev, event, cur) != 0)
1938 goto nomatch;
1939 break;
1940 case TK_M_KERNELS:
1941 case TK_M_SUBSYSTEMS:
1942 case TK_M_DRIVERS:
1943 case TK_M_ATTRS:
1944 case TK_M_TAGS: {
1945 struct token *next;
1946
1947 /* get whole sequence of parent matches */
1948 next = cur;
1949 while (next->type > TK_M_PARENTS_MIN && next->type < TK_M_PARENTS_MAX)
1950 next++;
1951
1952 /* loop over parents */
1953 event->dev_parent = event->dev;
1954 for (;;) {
1955 struct token *key;
1956
1957 /* loop over sequence of parent match keys */
1958 for (key = cur; key < next; key++ ) {
1959 dump_token(rules, key);
1960 switch(key->type) {
1961 case TK_M_KERNELS:
1962 if (match_key(rules, key, udev_device_get_sysname(event->dev_parent)) != 0)
1963 goto try_parent;
1964 break;
1965 case TK_M_SUBSYSTEMS:
1966 if (match_key(rules, key, udev_device_get_subsystem(event->dev_parent)) != 0)
1967 goto try_parent;
1968 break;
1969 case TK_M_DRIVERS:
1970 if (match_key(rules, key, udev_device_get_driver(event->dev_parent)) != 0)
1971 goto try_parent;
1972 break;
1973 case TK_M_ATTRS:
1974 if (match_attr(rules, event->dev_parent, event, key) != 0)
1975 goto try_parent;
1976 break;
1977 case TK_M_TAGS: {
1978 bool match = udev_device_has_tag(event->dev_parent, rules_str(rules, cur->key.value_off));
1979
1980 if (match && key->key.op == OP_NOMATCH)
1981 goto try_parent;
1982 if (!match && key->key.op == OP_MATCH)
1983 goto try_parent;
1984 break;
1985 }
1986 default:
1987 goto nomatch;
1988 }
1989 }
1990 break;
1991
1992 try_parent:
1993 event->dev_parent = udev_device_get_parent(event->dev_parent);
1994 if (event->dev_parent == NULL)
1995 goto nomatch;
1996 }
1997 /* move behind our sequence of parent match keys */
1998 cur = next;
1999 continue;
2000 }
2001 case TK_M_TEST: {
2002 char filename[UTIL_PATH_SIZE];
2003 struct stat statbuf;
2004 int match;
2005
2006 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), filename, sizeof(filename));
2007 if (util_resolve_subsys_kernel(event->udev, filename, filename, sizeof(filename), 0) != 0) {
2008 if (filename[0] != '/') {
2009 char tmp[UTIL_PATH_SIZE];
2010
2011 strscpy(tmp, sizeof(tmp), filename);
2012 strscpyl(filename, sizeof(filename),
2013 udev_device_get_syspath(event->dev), "/", tmp, NULL);
2014 }
2015 }
2016 attr_subst_subdir(filename, sizeof(filename));
2017
2018 match = (stat(filename, &statbuf) == 0);
2019 if (match && cur->key.mode > 0)
2020 match = ((statbuf.st_mode & cur->key.mode) > 0);
2021 if (match && cur->key.op == OP_NOMATCH)
2022 goto nomatch;
2023 if (!match && cur->key.op == OP_MATCH)
2024 goto nomatch;
2025 break;
2026 }
2027 case TK_M_EVENT_TIMEOUT:
2028 log_debug("OPTIONS event_timeout=%u", cur->key.event_timeout);
2029 event->timeout_usec = cur->key.event_timeout * 1000 * 1000;
2030 break;
2031 case TK_M_PROGRAM: {
2032 char program[UTIL_PATH_SIZE];
2033 char **envp;
2034 char result[UTIL_PATH_SIZE];
2035
2036 free(event->program_result);
2037 event->program_result = NULL;
2038 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), program, sizeof(program));
2039 envp = udev_device_get_properties_envp(event->dev);
2040 log_debug("PROGRAM '%s' %s:%u",
2041 program,
2042 rules_str(rules, rule->rule.filename_off),
2043 rule->rule.filename_line);
2044
2045 if (udev_event_spawn(event, program, envp, sigmask, result, sizeof(result)) < 0) {
2046 if (cur->key.op != OP_NOMATCH)
2047 goto nomatch;
2048 } else {
2049 int count;
2050
2051 util_remove_trailing_chars(result, '\n');
2052 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2053 count = util_replace_chars(result, UDEV_ALLOWED_CHARS_INPUT);
2054 if (count > 0)
2055 log_debug("%i character(s) replaced" , count);
2056 }
2057 event->program_result = strdup(result);
2058 if (cur->key.op == OP_NOMATCH)
2059 goto nomatch;
2060 }
2061 break;
2062 }
2063 case TK_M_IMPORT_FILE: {
2064 char import[UTIL_PATH_SIZE];
2065
2066 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), import, sizeof(import));
2067 if (import_file_into_properties(event->dev, import) != 0)
2068 if (cur->key.op != OP_NOMATCH)
2069 goto nomatch;
2070 break;
2071 }
2072 case TK_M_IMPORT_PROG: {
2073 char import[UTIL_PATH_SIZE];
2074
2075 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), import, sizeof(import));
2076 log_debug("IMPORT '%s' %s:%u",
2077 import,
2078 rules_str(rules, rule->rule.filename_off),
2079 rule->rule.filename_line);
2080
2081 if (import_program_into_properties(event, import, sigmask) != 0)
2082 if (cur->key.op != OP_NOMATCH)
2083 goto nomatch;
2084 break;
2085 }
2086 case TK_M_IMPORT_BUILTIN: {
2087 char command[UTIL_PATH_SIZE];
2088
2089 if (udev_builtin_run_once(cur->key.builtin_cmd)) {
2090 /* check if we ran already */
2091 if (event->builtin_run & (1 << cur->key.builtin_cmd)) {
2092 log_debug("IMPORT builtin skip '%s' %s:%u",
2093 udev_builtin_name(cur->key.builtin_cmd),
2094 rules_str(rules, rule->rule.filename_off),
2095 rule->rule.filename_line);
2096 /* return the result from earlier run */
2097 if (event->builtin_ret & (1 << cur->key.builtin_cmd))
2098 if (cur->key.op != OP_NOMATCH)
2099 goto nomatch;
2100 break;
2101 }
2102 /* mark as ran */
2103 event->builtin_run |= (1 << cur->key.builtin_cmd);
2104 }
2105
2106 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), command, sizeof(command));
2107 log_debug("IMPORT builtin '%s' %s:%u",
2108 udev_builtin_name(cur->key.builtin_cmd),
2109 rules_str(rules, rule->rule.filename_off),
2110 rule->rule.filename_line);
2111
2112 if (udev_builtin_run(event->dev, cur->key.builtin_cmd, command, false) != 0) {
2113 /* remember failure */
2114 log_debug("IMPORT builtin '%s' returned non-zero",
2115 udev_builtin_name(cur->key.builtin_cmd));
2116 event->builtin_ret |= (1 << cur->key.builtin_cmd);
2117 if (cur->key.op != OP_NOMATCH)
2118 goto nomatch;
2119 }
2120 break;
2121 }
2122 case TK_M_IMPORT_DB: {
2123 const char *key = rules_str(rules, cur->key.value_off);
2124 const char *value;
2125
2126 value = udev_device_get_property_value(event->dev_db, key);
2127 if (value != NULL) {
2128 struct udev_list_entry *entry;
2129
2130 entry = udev_device_add_property(event->dev, key, value);
2131 udev_list_entry_set_num(entry, true);
2132 } else {
2133 if (cur->key.op != OP_NOMATCH)
2134 goto nomatch;
2135 }
2136 break;
2137 }
2138 case TK_M_IMPORT_CMDLINE: {
2139 FILE *f;
2140 bool imported = false;
2141
2142 f = fopen("/proc/cmdline", "re");
2143 if (f != NULL) {
2144 char cmdline[4096];
2145
2146 if (fgets(cmdline, sizeof(cmdline), f) != NULL) {
2147 const char *key = rules_str(rules, cur->key.value_off);
2148 char *pos;
2149
2150 pos = strstr(cmdline, key);
2151 if (pos != NULL) {
2152 struct udev_list_entry *entry;
2153
2154 pos += strlen(key);
2155 if (pos[0] == '\0' || isspace(pos[0])) {
2156 /* we import simple flags as 'FLAG=1' */
2157 entry = udev_device_add_property(event->dev, key, "1");
2158 udev_list_entry_set_num(entry, true);
2159 imported = true;
2160 } else if (pos[0] == '=') {
2161 const char *value;
2162
2163 pos++;
2164 value = pos;
2165 while (pos[0] != '\0' && !isspace(pos[0]))
2166 pos++;
2167 pos[0] = '\0';
2168 entry = udev_device_add_property(event->dev, key, value);
2169 udev_list_entry_set_num(entry, true);
2170 imported = true;
2171 }
2172 }
2173 }
2174 fclose(f);
2175 }
2176 if (!imported && cur->key.op != OP_NOMATCH)
2177 goto nomatch;
2178 break;
2179 }
2180 case TK_M_IMPORT_PARENT: {
2181 char import[UTIL_PATH_SIZE];
2182
2183 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), import, sizeof(import));
2184 if (import_parent_into_properties(event->dev, import) != 0)
2185 if (cur->key.op != OP_NOMATCH)
2186 goto nomatch;
2187 break;
2188 }
2189 case TK_M_RESULT:
2190 if (match_key(rules, cur, event->program_result) != 0)
2191 goto nomatch;
2192 break;
2193 case TK_A_STRING_ESCAPE_NONE:
2194 esc = ESCAPE_NONE;
2195 break;
2196 case TK_A_STRING_ESCAPE_REPLACE:
2197 esc = ESCAPE_REPLACE;
2198 break;
2199 case TK_A_DB_PERSIST:
2200 udev_device_set_db_persist(event->dev);
2201 break;
2202 case TK_A_INOTIFY_WATCH:
2203 if (event->inotify_watch_final)
2204 break;
2205 if (cur->key.op == OP_ASSIGN_FINAL)
2206 event->inotify_watch_final = true;
2207 event->inotify_watch = cur->key.watch;
2208 break;
2209 case TK_A_DEVLINK_PRIO:
2210 udev_device_set_devlink_priority(event->dev, cur->key.devlink_prio);
2211 break;
2212 case TK_A_OWNER: {
2213 char owner[UTIL_NAME_SIZE];
2214
2215 if (event->owner_final)
2216 break;
2217 if (cur->key.op == OP_ASSIGN_FINAL)
2218 event->owner_final = true;
2219 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), owner, sizeof(owner));
2220 event->owner_set = true;
2221 event->uid = util_lookup_user(event->udev, owner);
2222 log_debug("OWNER %u %s:%u",
2223 event->uid,
2224 rules_str(rules, rule->rule.filename_off),
2225 rule->rule.filename_line);
2226 break;
2227 }
2228 case TK_A_GROUP: {
2229 char group[UTIL_NAME_SIZE];
2230
2231 if (event->group_final)
2232 break;
2233 if (cur->key.op == OP_ASSIGN_FINAL)
2234 event->group_final = true;
2235 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), group, sizeof(group));
2236 event->group_set = true;
2237 event->gid = util_lookup_group(event->udev, group);
2238 log_debug("GROUP %u %s:%u",
2239 event->gid,
2240 rules_str(rules, rule->rule.filename_off),
2241 rule->rule.filename_line);
2242 break;
2243 }
2244 case TK_A_MODE: {
2245 char mode_str[UTIL_NAME_SIZE];
2246 mode_t mode;
2247 char *endptr;
2248
2249 if (event->mode_final)
2250 break;
2251 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), mode_str, sizeof(mode_str));
2252 mode = strtol(mode_str, &endptr, 8);
2253 if (endptr[0] != '\0') {
2254 log_error("ignoring invalid mode '%s'", mode_str);
2255 break;
2256 }
2257 if (cur->key.op == OP_ASSIGN_FINAL)
2258 event->mode_final = true;
2259 event->mode_set = true;
2260 event->mode = mode;
2261 log_debug("MODE %#o %s:%u",
2262 event->mode,
2263 rules_str(rules, rule->rule.filename_off),
2264 rule->rule.filename_line);
2265 break;
2266 }
2267 case TK_A_OWNER_ID:
2268 if (event->owner_final)
2269 break;
2270 if (cur->key.op == OP_ASSIGN_FINAL)
2271 event->owner_final = true;
2272 event->owner_set = true;
2273 event->uid = cur->key.uid;
2274 log_debug("OWNER %u %s:%u",
2275 event->uid,
2276 rules_str(rules, rule->rule.filename_off),
2277 rule->rule.filename_line);
2278 break;
2279 case TK_A_GROUP_ID:
2280 if (event->group_final)
2281 break;
2282 if (cur->key.op == OP_ASSIGN_FINAL)
2283 event->group_final = true;
2284 event->group_set = true;
2285 event->gid = cur->key.gid;
2286 log_debug("GROUP %u %s:%u",
2287 event->gid,
2288 rules_str(rules, rule->rule.filename_off),
2289 rule->rule.filename_line);
2290 break;
2291 case TK_A_MODE_ID:
2292 if (event->mode_final)
2293 break;
2294 if (cur->key.op == OP_ASSIGN_FINAL)
2295 event->mode_final = true;
2296 event->mode_set = true;
2297 event->mode = cur->key.mode;
2298 log_debug("MODE %#o %s:%u",
2299 event->mode,
2300 rules_str(rules, rule->rule.filename_off),
2301 rule->rule.filename_line);
2302 break;
2303 case TK_A_SECLABEL: {
2304 const char *name, *label;
2305
2306 name = rules_str(rules, cur->key.attr_off);
2307 label = rules_str(rules, cur->key.value_off);
2308 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2309 udev_list_cleanup(&event->seclabel_list);
2310 udev_list_entry_add(&event->seclabel_list, name, label);
2311 log_debug("SECLABEL{%s}='%s' %s:%u",
2312 name, label,
2313 rules_str(rules, rule->rule.filename_off),
2314 rule->rule.filename_line);
2315 break;
2316 }
2317 case TK_A_ENV: {
2318 const char *name = rules_str(rules, cur->key.attr_off);
2319 char *value = rules_str(rules, cur->key.value_off);
2320 char value_new[UTIL_NAME_SIZE];
2321 const char *value_old = NULL;
2322 struct udev_list_entry *entry;
2323
2324 if (value[0] == '\0') {
2325 if (cur->key.op == OP_ADD)
2326 break;
2327 udev_device_add_property(event->dev, name, NULL);
2328 break;
2329 }
2330
2331 if (cur->key.op == OP_ADD)
2332 value_old = udev_device_get_property_value(event->dev, name);
2333 if (value_old) {
2334 char temp[UTIL_NAME_SIZE];
2335
2336 /* append value separated by space */
2337 udev_event_apply_format(event, value, temp, sizeof(temp));
2338 strscpyl(value_new, sizeof(value_new), value_old, " ", temp, NULL);
2339 } else
2340 udev_event_apply_format(event, value, value_new, sizeof(value_new));
2341
2342 entry = udev_device_add_property(event->dev, name, value_new);
2343 /* store in db, skip private keys */
2344 if (name[0] != '.')
2345 udev_list_entry_set_num(entry, true);
2346 break;
2347 }
2348 case TK_A_TAG: {
2349 char tag[UTIL_PATH_SIZE];
2350 const char *p;
2351
2352 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), tag, sizeof(tag));
2353 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2354 udev_device_cleanup_tags_list(event->dev);
2355 for (p = tag; *p != '\0'; p++) {
2356 if ((*p >= 'a' && *p <= 'z') ||
2357 (*p >= 'A' && *p <= 'Z') ||
2358 (*p >= '0' && *p <= '9') ||
2359 *p == '-' || *p == '_')
2360 continue;
2361 log_error("ignoring invalid tag name '%s'", tag);
2362 break;
2363 }
2364 udev_device_add_tag(event->dev, tag);
2365 break;
2366 }
2367 case TK_A_NAME: {
2368 const char *name = rules_str(rules, cur->key.value_off);
2369
2370 char name_str[UTIL_PATH_SIZE];
2371 int count;
2372
2373 if (event->name_final)
2374 break;
2375 if (cur->key.op == OP_ASSIGN_FINAL)
2376 event->name_final = true;
2377 udev_event_apply_format(event, name, name_str, sizeof(name_str));
2378 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2379 count = util_replace_chars(name_str, "/");
2380 if (count > 0)
2381 log_debug("%i character(s) replaced", count);
2382 }
2383 if (major(udev_device_get_devnum(event->dev)) &&
2384 (!streq(name_str, udev_device_get_devnode(event->dev) + strlen("/dev/")))) {
2385 log_error("NAME=\"%s\" ignored, kernel device nodes "
2386 "can not be renamed; please fix it in %s:%u\n", name,
2387 rules_str(rules, rule->rule.filename_off), rule->rule.filename_line);
2388 break;
2389 }
2390 free(event->name);
2391 event->name = strdup(name_str);
2392 log_debug("NAME '%s' %s:%u",
2393 event->name,
2394 rules_str(rules, rule->rule.filename_off),
2395 rule->rule.filename_line);
2396 break;
2397 }
2398 case TK_A_DEVLINK: {
2399 char temp[UTIL_PATH_SIZE];
2400 char filename[UTIL_PATH_SIZE];
2401 char *pos, *next;
2402 int count = 0;
2403
2404 if (event->devlink_final)
2405 break;
2406 if (major(udev_device_get_devnum(event->dev)) == 0)
2407 break;
2408 if (cur->key.op == OP_ASSIGN_FINAL)
2409 event->devlink_final = true;
2410 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2411 udev_device_cleanup_devlinks_list(event->dev);
2412
2413 /* allow multiple symlinks separated by spaces */
2414 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), temp, sizeof(temp));
2415 if (esc == ESCAPE_UNSET)
2416 count = util_replace_chars(temp, "/ ");
2417 else if (esc == ESCAPE_REPLACE)
2418 count = util_replace_chars(temp, "/");
2419 if (count > 0)
2420 log_debug("%i character(s) replaced" , count);
2421 pos = temp;
2422 while (isspace(pos[0]))
2423 pos++;
2424 next = strchr(pos, ' ');
2425 while (next != NULL) {
2426 next[0] = '\0';
2427 log_debug("LINK '%s' %s:%u", pos,
2428 rules_str(rules, rule->rule.filename_off), rule->rule.filename_line);
2429 strscpyl(filename, sizeof(filename), "/dev/", pos, NULL);
2430 udev_device_add_devlink(event->dev, filename);
2431 while (isspace(next[1]))
2432 next++;
2433 pos = &next[1];
2434 next = strchr(pos, ' ');
2435 }
2436 if (pos[0] != '\0') {
2437 log_debug("LINK '%s' %s:%u", pos,
2438 rules_str(rules, rule->rule.filename_off), rule->rule.filename_line);
2439 strscpyl(filename, sizeof(filename), "/dev/", pos, NULL);
2440 udev_device_add_devlink(event->dev, filename);
2441 }
2442 break;
2443 }
2444 case TK_A_ATTR: {
2445 const char *key_name = rules_str(rules, cur->key.attr_off);
2446 char attr[UTIL_PATH_SIZE];
2447 char value[UTIL_NAME_SIZE];
2448 FILE *f;
2449
2450 if (util_resolve_subsys_kernel(event->udev, key_name, attr, sizeof(attr), 0) != 0)
2451 strscpyl(attr, sizeof(attr), udev_device_get_syspath(event->dev), "/", key_name, NULL);
2452 attr_subst_subdir(attr, sizeof(attr));
2453
2454 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), value, sizeof(value));
2455 log_debug("ATTR '%s' writing '%s' %s:%u", attr, value,
2456 rules_str(rules, rule->rule.filename_off),
2457 rule->rule.filename_line);
2458 f = fopen(attr, "we");
2459 if (f != NULL) {
2460 if (fprintf(f, "%s", value) <= 0)
2461 log_error("error writing ATTR{%s}: %m", attr);
2462 fclose(f);
2463 } else {
2464 log_error("error opening ATTR{%s} for writing: %m", attr);
2465 }
2466 break;
2467 }
2468 case TK_A_RUN_BUILTIN:
2469 case TK_A_RUN_PROGRAM: {
2470 struct udev_list_entry *entry;
2471
2472 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2473 udev_list_cleanup(&event->run_list);
2474 log_debug("RUN '%s' %s:%u",
2475 rules_str(rules, cur->key.value_off),
2476 rules_str(rules, rule->rule.filename_off),
2477 rule->rule.filename_line);
2478 entry = udev_list_entry_add(&event->run_list, rules_str(rules, cur->key.value_off), NULL);
2479 udev_list_entry_set_num(entry, cur->key.builtin_cmd);
2480 break;
2481 }
2482 case TK_A_GOTO:
2483 if (cur->key.rule_goto == 0)
2484 break;
2485 cur = &rules->tokens[cur->key.rule_goto];
2486 continue;
2487 case TK_END:
2488 return 0;
2489
2490 case TK_M_PARENTS_MIN:
2491 case TK_M_PARENTS_MAX:
2492 case TK_M_MAX:
2493 case TK_UNSET:
2494 log_error("wrong type %u", cur->type);
2495 goto nomatch;
2496 }
2497
2498 cur++;
2499 continue;
2500 nomatch:
2501 /* fast-forward to next rule */
2502 cur = rule + rule->rule.token_count;
2503 }
2504 }
2505
2506 int udev_rules_apply_static_dev_perms(struct udev_rules *rules)
2507 {
2508 struct token *cur;
2509 struct token *rule;
2510 uid_t uid = 0;
2511 gid_t gid = 0;
2512 mode_t mode = 0;
2513 _cleanup_strv_free_ char **tags = NULL;
2514 char **t;
2515 FILE *f = NULL;
2516 _cleanup_free_ char *path = NULL;
2517 int r = 0;
2518
2519 if (rules->tokens == NULL)
2520 return 0;
2521
2522 cur = &rules->tokens[0];
2523 rule = cur;
2524 for (;;) {
2525 switch (cur->type) {
2526 case TK_RULE:
2527 /* current rule */
2528 rule = cur;
2529
2530 /* skip rules without a static_node tag */
2531 if (!rule->rule.has_static_node)
2532 goto next;
2533
2534 uid = 0;
2535 gid = 0;
2536 mode = 0;
2537 strv_free(tags);
2538 tags = NULL;
2539 break;
2540 case TK_A_OWNER_ID:
2541 uid = cur->key.uid;
2542 break;
2543 case TK_A_GROUP_ID:
2544 gid = cur->key.gid;
2545 break;
2546 case TK_A_MODE_ID:
2547 mode = cur->key.mode;
2548 break;
2549 case TK_A_TAG:
2550 r = strv_extend(&tags, rules_str(rules, cur->key.value_off));
2551 if (r < 0)
2552 goto finish;
2553
2554 break;
2555 case TK_A_STATIC_NODE: {
2556 char device_node[UTIL_PATH_SIZE];
2557 char tags_dir[UTIL_PATH_SIZE];
2558 char tag_symlink[UTIL_PATH_SIZE];
2559 struct stat stats;
2560
2561 /* we assure, that the permissions tokens are sorted before the static token */
2562 if (mode == 0 && uid == 0 && gid == 0 && tags == NULL)
2563 goto next;
2564 strscpyl(device_node, sizeof(device_node), "/dev/", rules_str(rules, cur->key.value_off), NULL);
2565 if (stat(device_node, &stats) != 0)
2566 goto next;
2567 if (!S_ISBLK(stats.st_mode) && !S_ISCHR(stats.st_mode))
2568 goto next;
2569
2570 if (tags) {
2571 /* Export the tags to a directory as symlinks, allowing otherwise dead nodes to be tagged */
2572
2573 STRV_FOREACH(t, tags) {
2574 _cleanup_free_ char *unescaped_filename = NULL;
2575
2576 strscpyl(tags_dir, sizeof(tags_dir), "/run/udev/static_node-tags/", *t, "/", NULL);
2577 r = mkdir_p(tags_dir, 0755);
2578 if (r < 0) {
2579 log_error("failed to create %s: %s", tags_dir, strerror(-r));
2580 return r;
2581 }
2582
2583 unescaped_filename = xescape(rules_str(rules, cur->key.value_off), "/.");
2584
2585 strscpyl(tag_symlink, sizeof(tag_symlink), tags_dir, unescaped_filename, NULL);
2586 r = symlink(device_node, tag_symlink);
2587 if (r < 0 && errno != EEXIST) {
2588 log_error("failed to create symlink %s -> %s: %m", tag_symlink, device_node);
2589 return -errno;
2590 } else
2591 r = 0;
2592 }
2593 }
2594
2595 /* don't touch the permissions if only the tags were set */
2596 if (mode == 0 && uid == 0 && gid == 0)
2597 goto next;
2598
2599 if (mode == 0) {
2600 if (gid > 0)
2601 mode = 0660;
2602 else
2603 mode = 0600;
2604 }
2605 if (mode != (stats.st_mode & 01777)) {
2606 r = chmod(device_node, mode);
2607 if (r < 0) {
2608 log_error("failed to chmod '%s' %#o", device_node, mode);
2609 return -errno;
2610 } else
2611 log_debug("chmod '%s' %#o", device_node, mode);
2612 }
2613
2614 if ((uid != 0 && uid != stats.st_uid) || (gid != 0 && gid != stats.st_gid)) {
2615 r = chown(device_node, uid, gid);
2616 if (r < 0) {
2617 log_error("failed to chown '%s' %u %u ", device_node, uid, gid);
2618 return -errno;
2619 } else
2620 log_debug("chown '%s' %u %u", device_node, uid, gid);
2621 }
2622
2623 utimensat(AT_FDCWD, device_node, NULL, 0);
2624 break;
2625 }
2626 case TK_END:
2627 goto finish;
2628 }
2629
2630 cur++;
2631 continue;
2632 next:
2633 /* fast-forward to next rule */
2634 cur = rule + rule->rule.token_count;
2635 continue;
2636 }
2637
2638 finish:
2639 if (f) {
2640 fflush(f);
2641 fchmod(fileno(f), 0644);
2642 if (ferror(f) || rename(path, "/run/udev/static_node-tags") < 0) {
2643 r = -errno;
2644 unlink("/run/udev/static_node-tags");
2645 unlink(path);
2646 }
2647 fclose(f);
2648 }
2649
2650 return r;
2651 }
Unnamed repository; edit this file 'description' to name the repository.