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Merge pull request #2495 from heftig/master
[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 <ctype.h>
19 #include <dirent.h>
20 #include <errno.h>
21 #include <fcntl.h>
22 #include <fnmatch.h>
23 #include <limits.h>
24 #include <stdbool.h>
25 #include <stddef.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <time.h>
30 #include <unistd.h>
31
32 #include "alloc-util.h"
33 #include "conf-files.h"
34 #include "escape.h"
35 #include "fd-util.h"
36 #include "glob-util.h"
37 #include "path-util.h"
38 #include "stat-util.h"
39 #include "strbuf.h"
40 #include "string-util.h"
41 #include "strv.h"
42 #include "sysctl-util.h"
43 #include "udev.h"
44 #include "user-util.h"
45 #include "util.h"
46
47 #define PREALLOC_TOKEN 2048
48
49 struct uid_gid {
50 unsigned int name_off;
51 union {
52 uid_t uid;
53 gid_t gid;
54 };
55 };
56
57 static const char* const rules_dirs[] = {
58 "/etc/udev/rules.d",
59 "/run/udev/rules.d",
60 UDEVLIBEXECDIR "/rules.d",
61 NULL
62 };
63
64 struct udev_rules {
65 struct udev *udev;
66 usec_t dirs_ts_usec;
67 int resolve_names;
68
69 /* every key in the rules file becomes a token */
70 struct token *tokens;
71 unsigned int token_cur;
72 unsigned int token_max;
73
74 /* all key strings are copied and de-duplicated in a single continuous string buffer */
75 struct strbuf *strbuf;
76
77 /* during rule parsing, uid/gid lookup results are cached */
78 struct uid_gid *uids;
79 unsigned int uids_cur;
80 unsigned int uids_max;
81 struct uid_gid *gids;
82 unsigned int gids_cur;
83 unsigned int gids_max;
84 };
85
86 static char *rules_str(struct udev_rules *rules, unsigned int off) {
87 return rules->strbuf->buf + off;
88 }
89
90 static unsigned int rules_add_string(struct udev_rules *rules, const char *s) {
91 return strbuf_add_string(rules->strbuf, s, strlen(s));
92 }
93
94 /* KEY=="", KEY!="", KEY+="", KEY-="", KEY="", KEY:="" */
95 enum operation_type {
96 OP_UNSET,
97
98 OP_MATCH,
99 OP_NOMATCH,
100 OP_MATCH_MAX,
101
102 OP_ADD,
103 OP_REMOVE,
104 OP_ASSIGN,
105 OP_ASSIGN_FINAL,
106 };
107
108 enum string_glob_type {
109 GL_UNSET,
110 GL_PLAIN, /* no special chars */
111 GL_GLOB, /* shell globs ?,*,[] */
112 GL_SPLIT, /* multi-value A|B */
113 GL_SPLIT_GLOB, /* multi-value with glob A*|B* */
114 GL_SOMETHING, /* commonly used "?*" */
115 };
116
117 enum string_subst_type {
118 SB_UNSET,
119 SB_NONE,
120 SB_FORMAT,
121 SB_SUBSYS,
122 };
123
124 /* tokens of a rule are sorted/handled in this order */
125 enum token_type {
126 TK_UNSET,
127 TK_RULE,
128
129 TK_M_ACTION, /* val */
130 TK_M_DEVPATH, /* val */
131 TK_M_KERNEL, /* val */
132 TK_M_DEVLINK, /* val */
133 TK_M_NAME, /* val */
134 TK_M_ENV, /* val, attr */
135 TK_M_TAG, /* val */
136 TK_M_SUBSYSTEM, /* val */
137 TK_M_DRIVER, /* val */
138 TK_M_WAITFOR, /* val */
139 TK_M_ATTR, /* val, attr */
140 TK_M_SYSCTL, /* val, attr */
141
142 TK_M_PARENTS_MIN,
143 TK_M_KERNELS, /* val */
144 TK_M_SUBSYSTEMS, /* val */
145 TK_M_DRIVERS, /* val */
146 TK_M_ATTRS, /* val, attr */
147 TK_M_TAGS, /* val */
148 TK_M_PARENTS_MAX,
149
150 TK_M_TEST, /* val, mode_t */
151 TK_M_PROGRAM, /* val */
152 TK_M_IMPORT_FILE, /* val */
153 TK_M_IMPORT_PROG, /* val */
154 TK_M_IMPORT_BUILTIN, /* val */
155 TK_M_IMPORT_DB, /* val */
156 TK_M_IMPORT_CMDLINE, /* val */
157 TK_M_IMPORT_PARENT, /* val */
158 TK_M_RESULT, /* val */
159 TK_M_MAX,
160
161 TK_A_STRING_ESCAPE_NONE,
162 TK_A_STRING_ESCAPE_REPLACE,
163 TK_A_DB_PERSIST,
164 TK_A_INOTIFY_WATCH, /* int */
165 TK_A_DEVLINK_PRIO, /* int */
166 TK_A_OWNER, /* val */
167 TK_A_GROUP, /* val */
168 TK_A_MODE, /* val */
169 TK_A_OWNER_ID, /* uid_t */
170 TK_A_GROUP_ID, /* gid_t */
171 TK_A_MODE_ID, /* mode_t */
172 TK_A_TAG, /* val */
173 TK_A_STATIC_NODE, /* val */
174 TK_A_SECLABEL, /* val, attr */
175 TK_A_ENV, /* val, attr */
176 TK_A_NAME, /* val */
177 TK_A_DEVLINK, /* val */
178 TK_A_ATTR, /* val, attr */
179 TK_A_SYSCTL, /* val, attr */
180 TK_A_RUN_BUILTIN, /* val, bool */
181 TK_A_RUN_PROGRAM, /* val, bool */
182 TK_A_GOTO, /* size_t */
183
184 TK_END,
185 };
186
187 /* we try to pack stuff in a way that we take only 12 bytes per token */
188 struct token {
189 union {
190 unsigned char type; /* same in rule and key */
191 struct {
192 enum token_type type:8;
193 bool can_set_name:1;
194 bool has_static_node:1;
195 unsigned int unused:6;
196 unsigned short token_count;
197 unsigned int label_off;
198 unsigned short filename_off;
199 unsigned short filename_line;
200 } rule;
201 struct {
202 enum token_type type:8;
203 enum operation_type op:8;
204 enum string_glob_type glob:8;
205 enum string_subst_type subst:4;
206 enum string_subst_type attrsubst:4;
207 unsigned int value_off;
208 union {
209 unsigned int attr_off;
210 unsigned int rule_goto;
211 mode_t mode;
212 uid_t uid;
213 gid_t gid;
214 int devlink_prio;
215 int watch;
216 enum udev_builtin_cmd builtin_cmd;
217 };
218 } key;
219 };
220 };
221
222 #define MAX_TK 64
223 struct rule_tmp {
224 struct udev_rules *rules;
225 struct token rule;
226 struct token token[MAX_TK];
227 unsigned int token_cur;
228 };
229
230 #ifdef DEBUG
231 static const char *operation_str(enum operation_type type) {
232 static const char *operation_strs[] = {
233 [OP_UNSET] = "UNSET",
234 [OP_MATCH] = "match",
235 [OP_NOMATCH] = "nomatch",
236 [OP_MATCH_MAX] = "MATCH_MAX",
237
238 [OP_ADD] = "add",
239 [OP_REMOVE] = "remove",
240 [OP_ASSIGN] = "assign",
241 [OP_ASSIGN_FINAL] = "assign-final",
242 } ;
243
244 return operation_strs[type];
245 }
246
247 static const char *string_glob_str(enum string_glob_type type) {
248 static const char *string_glob_strs[] = {
249 [GL_UNSET] = "UNSET",
250 [GL_PLAIN] = "plain",
251 [GL_GLOB] = "glob",
252 [GL_SPLIT] = "split",
253 [GL_SPLIT_GLOB] = "split-glob",
254 [GL_SOMETHING] = "split-glob",
255 };
256
257 return string_glob_strs[type];
258 }
259
260 static const char *token_str(enum token_type type) {
261 static const char *token_strs[] = {
262 [TK_UNSET] = "UNSET",
263 [TK_RULE] = "RULE",
264
265 [TK_M_ACTION] = "M ACTION",
266 [TK_M_DEVPATH] = "M DEVPATH",
267 [TK_M_KERNEL] = "M KERNEL",
268 [TK_M_DEVLINK] = "M DEVLINK",
269 [TK_M_NAME] = "M NAME",
270 [TK_M_ENV] = "M ENV",
271 [TK_M_TAG] = "M TAG",
272 [TK_M_SUBSYSTEM] = "M SUBSYSTEM",
273 [TK_M_DRIVER] = "M DRIVER",
274 [TK_M_WAITFOR] = "M WAITFOR",
275 [TK_M_ATTR] = "M ATTR",
276 [TK_M_SYSCTL] = "M SYSCTL",
277
278 [TK_M_PARENTS_MIN] = "M PARENTS_MIN",
279 [TK_M_KERNELS] = "M KERNELS",
280 [TK_M_SUBSYSTEMS] = "M SUBSYSTEMS",
281 [TK_M_DRIVERS] = "M DRIVERS",
282 [TK_M_ATTRS] = "M ATTRS",
283 [TK_M_TAGS] = "M TAGS",
284 [TK_M_PARENTS_MAX] = "M PARENTS_MAX",
285
286 [TK_M_TEST] = "M TEST",
287 [TK_M_PROGRAM] = "M PROGRAM",
288 [TK_M_IMPORT_FILE] = "M IMPORT_FILE",
289 [TK_M_IMPORT_PROG] = "M IMPORT_PROG",
290 [TK_M_IMPORT_BUILTIN] = "M IMPORT_BUILTIN",
291 [TK_M_IMPORT_DB] = "M IMPORT_DB",
292 [TK_M_IMPORT_CMDLINE] = "M IMPORT_CMDLINE",
293 [TK_M_IMPORT_PARENT] = "M IMPORT_PARENT",
294 [TK_M_RESULT] = "M RESULT",
295 [TK_M_MAX] = "M MAX",
296
297 [TK_A_STRING_ESCAPE_NONE] = "A STRING_ESCAPE_NONE",
298 [TK_A_STRING_ESCAPE_REPLACE] = "A STRING_ESCAPE_REPLACE",
299 [TK_A_DB_PERSIST] = "A DB_PERSIST",
300 [TK_A_INOTIFY_WATCH] = "A INOTIFY_WATCH",
301 [TK_A_DEVLINK_PRIO] = "A DEVLINK_PRIO",
302 [TK_A_OWNER] = "A OWNER",
303 [TK_A_GROUP] = "A GROUP",
304 [TK_A_MODE] = "A MODE",
305 [TK_A_OWNER_ID] = "A OWNER_ID",
306 [TK_A_GROUP_ID] = "A GROUP_ID",
307 [TK_A_STATIC_NODE] = "A STATIC_NODE",
308 [TK_A_SECLABEL] = "A SECLABEL",
309 [TK_A_MODE_ID] = "A MODE_ID",
310 [TK_A_ENV] = "A ENV",
311 [TK_A_TAG] = "A ENV",
312 [TK_A_NAME] = "A NAME",
313 [TK_A_DEVLINK] = "A DEVLINK",
314 [TK_A_ATTR] = "A ATTR",
315 [TK_A_SYSCTL] = "A SYSCTL",
316 [TK_A_RUN_BUILTIN] = "A RUN_BUILTIN",
317 [TK_A_RUN_PROGRAM] = "A RUN_PROGRAM",
318 [TK_A_GOTO] = "A GOTO",
319
320 [TK_END] = "END",
321 };
322
323 return token_strs[type];
324 }
325
326 static void dump_token(struct udev_rules *rules, struct token *token) {
327 enum token_type type = token->type;
328 enum operation_type op = token->key.op;
329 enum string_glob_type glob = token->key.glob;
330 const char *value = str(rules, token->key.value_off);
331 const char *attr = &rules->buf[token->key.attr_off];
332
333 switch (type) {
334 case TK_RULE:
335 {
336 const char *tks_ptr = (char *)rules->tokens;
337 const char *tk_ptr = (char *)token;
338 unsigned int idx = (tk_ptr - tks_ptr) / sizeof(struct token);
339
340 log_debug("* RULE %s:%u, token: %u, count: %u, label: '%s'",
341 &rules->buf[token->rule.filename_off], token->rule.filename_line,
342 idx, token->rule.token_count,
343 &rules->buf[token->rule.label_off]);
344 break;
345 }
346 case TK_M_ACTION:
347 case TK_M_DEVPATH:
348 case TK_M_KERNEL:
349 case TK_M_SUBSYSTEM:
350 case TK_M_DRIVER:
351 case TK_M_WAITFOR:
352 case TK_M_DEVLINK:
353 case TK_M_NAME:
354 case TK_M_KERNELS:
355 case TK_M_SUBSYSTEMS:
356 case TK_M_DRIVERS:
357 case TK_M_TAGS:
358 case TK_M_PROGRAM:
359 case TK_M_IMPORT_FILE:
360 case TK_M_IMPORT_PROG:
361 case TK_M_IMPORT_DB:
362 case TK_M_IMPORT_CMDLINE:
363 case TK_M_IMPORT_PARENT:
364 case TK_M_RESULT:
365 case TK_A_NAME:
366 case TK_A_DEVLINK:
367 case TK_A_OWNER:
368 case TK_A_GROUP:
369 case TK_A_MODE:
370 case TK_A_RUN_BUILTIN:
371 case TK_A_RUN_PROGRAM:
372 log_debug("%s %s '%s'(%s)",
373 token_str(type), operation_str(op), value, string_glob_str(glob));
374 break;
375 case TK_M_IMPORT_BUILTIN:
376 log_debug("%s %i '%s'", token_str(type), token->key.builtin_cmd, value);
377 break;
378 case TK_M_ATTR:
379 case TK_M_SYSCTL:
380 case TK_M_ATTRS:
381 case TK_M_ENV:
382 case TK_A_ATTR:
383 case TK_A_SYSCTL:
384 case TK_A_ENV:
385 log_debug("%s %s '%s' '%s'(%s)",
386 token_str(type), operation_str(op), attr, value, string_glob_str(glob));
387 break;
388 case TK_M_TAG:
389 case TK_A_TAG:
390 log_debug("%s %s '%s'", token_str(type), operation_str(op), value);
391 break;
392 case TK_A_STRING_ESCAPE_NONE:
393 case TK_A_STRING_ESCAPE_REPLACE:
394 case TK_A_DB_PERSIST:
395 log_debug("%s", token_str(type));
396 break;
397 case TK_M_TEST:
398 log_debug("%s %s '%s'(%s) %#o",
399 token_str(type), operation_str(op), value, string_glob_str(glob), token->key.mode);
400 break;
401 case TK_A_INOTIFY_WATCH:
402 log_debug("%s %u", token_str(type), token->key.watch);
403 break;
404 case TK_A_DEVLINK_PRIO:
405 log_debug("%s %u", token_str(type), token->key.devlink_prio);
406 break;
407 case TK_A_OWNER_ID:
408 log_debug("%s %s %u", token_str(type), operation_str(op), token->key.uid);
409 break;
410 case TK_A_GROUP_ID:
411 log_debug("%s %s %u", token_str(type), operation_str(op), token->key.gid);
412 break;
413 case TK_A_MODE_ID:
414 log_debug("%s %s %#o", token_str(type), operation_str(op), token->key.mode);
415 break;
416 case TK_A_STATIC_NODE:
417 log_debug("%s '%s'", token_str(type), value);
418 break;
419 case TK_A_SECLABEL:
420 log_debug("%s %s '%s' '%s'", token_str(type), operation_str(op), attr, value);
421 break;
422 case TK_A_GOTO:
423 log_debug("%s '%s' %u", token_str(type), value, token->key.rule_goto);
424 break;
425 case TK_END:
426 log_debug("* %s", token_str(type));
427 break;
428 case TK_M_PARENTS_MIN:
429 case TK_M_PARENTS_MAX:
430 case TK_M_MAX:
431 case TK_UNSET:
432 log_debug("unknown type %u", type);
433 break;
434 }
435 }
436
437 static void dump_rules(struct udev_rules *rules) {
438 unsigned int i;
439
440 log_debug("dumping %u (%zu bytes) tokens, %u (%zu bytes) strings",
441 rules->token_cur,
442 rules->token_cur * sizeof(struct token),
443 rules->buf_count,
444 rules->buf_cur);
445 for (i = 0; i < rules->token_cur; i++)
446 dump_token(rules, &rules->tokens[i]);
447 }
448 #else
449 static inline void dump_token(struct udev_rules *rules, struct token *token) {}
450 static inline void dump_rules(struct udev_rules *rules) {}
451 #endif /* DEBUG */
452
453 static int add_token(struct udev_rules *rules, struct token *token) {
454 /* grow buffer if needed */
455 if (rules->token_cur+1 >= rules->token_max) {
456 struct token *tokens;
457 unsigned int add;
458
459 /* double the buffer size */
460 add = rules->token_max;
461 if (add < 8)
462 add = 8;
463
464 tokens = realloc(rules->tokens, (rules->token_max + add ) * sizeof(struct token));
465 if (tokens == NULL)
466 return -1;
467 rules->tokens = tokens;
468 rules->token_max += add;
469 }
470 memcpy(&rules->tokens[rules->token_cur], token, sizeof(struct token));
471 rules->token_cur++;
472 return 0;
473 }
474
475 static uid_t add_uid(struct udev_rules *rules, const char *owner) {
476 unsigned int i;
477 uid_t uid = 0;
478 unsigned int off;
479 int r;
480
481 /* lookup, if we know it already */
482 for (i = 0; i < rules->uids_cur; i++) {
483 off = rules->uids[i].name_off;
484 if (streq(rules_str(rules, off), owner)) {
485 uid = rules->uids[i].uid;
486 return uid;
487 }
488 }
489 r = get_user_creds(&owner, &uid, NULL, NULL, NULL);
490 if (r < 0) {
491 if (r == -ENOENT || r == -ESRCH)
492 log_error("specified user '%s' unknown", owner);
493 else
494 log_error_errno(r, "error resolving user '%s': %m", owner);
495 }
496
497 /* grow buffer if needed */
498 if (rules->uids_cur+1 >= rules->uids_max) {
499 struct uid_gid *uids;
500 unsigned int add;
501
502 /* double the buffer size */
503 add = rules->uids_max;
504 if (add < 1)
505 add = 8;
506
507 uids = realloc(rules->uids, (rules->uids_max + add ) * sizeof(struct uid_gid));
508 if (uids == NULL)
509 return uid;
510 rules->uids = uids;
511 rules->uids_max += add;
512 }
513 rules->uids[rules->uids_cur].uid = uid;
514 off = rules_add_string(rules, owner);
515 if (off <= 0)
516 return uid;
517 rules->uids[rules->uids_cur].name_off = off;
518 rules->uids_cur++;
519 return uid;
520 }
521
522 static gid_t add_gid(struct udev_rules *rules, const char *group) {
523 unsigned int i;
524 gid_t gid = 0;
525 unsigned int off;
526 int r;
527
528 /* lookup, if we know it already */
529 for (i = 0; i < rules->gids_cur; i++) {
530 off = rules->gids[i].name_off;
531 if (streq(rules_str(rules, off), group)) {
532 gid = rules->gids[i].gid;
533 return gid;
534 }
535 }
536 r = get_group_creds(&group, &gid);
537 if (r < 0) {
538 if (r == -ENOENT || r == -ESRCH)
539 log_error("specified group '%s' unknown", group);
540 else
541 log_error_errno(r, "error resolving group '%s': %m", group);
542 }
543
544 /* grow buffer if needed */
545 if (rules->gids_cur+1 >= rules->gids_max) {
546 struct uid_gid *gids;
547 unsigned int add;
548
549 /* double the buffer size */
550 add = rules->gids_max;
551 if (add < 1)
552 add = 8;
553
554 gids = realloc(rules->gids, (rules->gids_max + add ) * sizeof(struct uid_gid));
555 if (gids == NULL)
556 return gid;
557 rules->gids = gids;
558 rules->gids_max += add;
559 }
560 rules->gids[rules->gids_cur].gid = gid;
561 off = rules_add_string(rules, group);
562 if (off <= 0)
563 return gid;
564 rules->gids[rules->gids_cur].name_off = off;
565 rules->gids_cur++;
566 return gid;
567 }
568
569 static int import_property_from_string(struct udev_device *dev, char *line) {
570 char *key;
571 char *val;
572 size_t len;
573
574 /* find key */
575 key = line;
576 while (isspace(key[0]))
577 key++;
578
579 /* comment or empty line */
580 if (key[0] == '#' || key[0] == '\0')
581 return -1;
582
583 /* split key/value */
584 val = strchr(key, '=');
585 if (val == NULL)
586 return -1;
587 val[0] = '\0';
588 val++;
589
590 /* find value */
591 while (isspace(val[0]))
592 val++;
593
594 /* terminate key */
595 len = strlen(key);
596 if (len == 0)
597 return -1;
598 while (isspace(key[len-1]))
599 len--;
600 key[len] = '\0';
601
602 /* terminate value */
603 len = strlen(val);
604 if (len == 0)
605 return -1;
606 while (isspace(val[len-1]))
607 len--;
608 val[len] = '\0';
609
610 if (len == 0)
611 return -1;
612
613 /* unquote */
614 if (val[0] == '"' || val[0] == '\'') {
615 if (val[len-1] != val[0]) {
616 log_debug("inconsistent quoting: '%s', skip", line);
617 return -1;
618 }
619 val[len-1] = '\0';
620 val++;
621 }
622
623 udev_device_add_property(dev, key, val);
624
625 return 0;
626 }
627
628 static int import_file_into_properties(struct udev_device *dev, const char *filename) {
629 FILE *f;
630 char line[UTIL_LINE_SIZE];
631
632 f = fopen(filename, "re");
633 if (f == NULL)
634 return -1;
635 while (fgets(line, sizeof(line), f) != NULL)
636 import_property_from_string(dev, line);
637 fclose(f);
638 return 0;
639 }
640
641 static int import_program_into_properties(struct udev_event *event,
642 usec_t timeout_usec,
643 usec_t timeout_warn_usec,
644 const char *program) {
645 char result[UTIL_LINE_SIZE];
646 char *line;
647 int err;
648
649 err = udev_event_spawn(event, timeout_usec, timeout_warn_usec, true, program, result, sizeof(result));
650 if (err < 0)
651 return err;
652
653 line = result;
654 while (line != NULL) {
655 char *pos;
656
657 pos = strchr(line, '\n');
658 if (pos != NULL) {
659 pos[0] = '\0';
660 pos = &pos[1];
661 }
662 import_property_from_string(event->dev, line);
663 line = pos;
664 }
665 return 0;
666 }
667
668 static int import_parent_into_properties(struct udev_device *dev, const char *filter) {
669 struct udev_device *dev_parent;
670 struct udev_list_entry *list_entry;
671
672 assert(dev);
673 assert(filter);
674
675 dev_parent = udev_device_get_parent(dev);
676 if (dev_parent == NULL)
677 return -1;
678
679 udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(dev_parent)) {
680 const char *key = udev_list_entry_get_name(list_entry);
681 const char *val = udev_list_entry_get_value(list_entry);
682
683 if (fnmatch(filter, key, 0) == 0)
684 udev_device_add_property(dev, key, val);
685 }
686 return 0;
687 }
688
689 static int attr_subst_subdir(char *attr, size_t len) {
690 bool found = false;
691
692 if (strstr(attr, "/*/")) {
693 char *pos;
694 char dirname[UTIL_PATH_SIZE];
695 const char *tail;
696 DIR *dir;
697
698 strscpy(dirname, sizeof(dirname), attr);
699 pos = strstr(dirname, "/*/");
700 if (pos == NULL)
701 return -1;
702 pos[0] = '\0';
703 tail = &pos[2];
704 dir = opendir(dirname);
705 if (dir != NULL) {
706 struct dirent *dent;
707
708 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
709 struct stat stats;
710
711 if (dent->d_name[0] == '.')
712 continue;
713 strscpyl(attr, len, dirname, "/", dent->d_name, tail, NULL);
714 if (stat(attr, &stats) == 0) {
715 found = true;
716 break;
717 }
718 }
719 closedir(dir);
720 }
721 }
722
723 return found;
724 }
725
726 static int get_key(struct udev *udev, char **line, char **key, enum operation_type *op, char **value) {
727 char *linepos;
728 char *temp;
729
730 linepos = *line;
731 if (linepos == NULL || linepos[0] == '\0')
732 return -1;
733
734 /* skip whitespace */
735 while (isspace(linepos[0]) || linepos[0] == ',')
736 linepos++;
737
738 /* get the key */
739 if (linepos[0] == '\0')
740 return -1;
741 *key = linepos;
742
743 for (;;) {
744 linepos++;
745 if (linepos[0] == '\0')
746 return -1;
747 if (isspace(linepos[0]))
748 break;
749 if (linepos[0] == '=')
750 break;
751 if ((linepos[0] == '+') || (linepos[0] == '-') || (linepos[0] == '!') || (linepos[0] == ':'))
752 if (linepos[1] == '=')
753 break;
754 }
755
756 /* remember end of key */
757 temp = linepos;
758
759 /* skip whitespace after key */
760 while (isspace(linepos[0]))
761 linepos++;
762 if (linepos[0] == '\0')
763 return -1;
764
765 /* get operation type */
766 if (linepos[0] == '=' && linepos[1] == '=') {
767 *op = OP_MATCH;
768 linepos += 2;
769 } else if (linepos[0] == '!' && linepos[1] == '=') {
770 *op = OP_NOMATCH;
771 linepos += 2;
772 } else if (linepos[0] == '+' && linepos[1] == '=') {
773 *op = OP_ADD;
774 linepos += 2;
775 } else if (linepos[0] == '-' && linepos[1] == '=') {
776 *op = OP_REMOVE;
777 linepos += 2;
778 } else if (linepos[0] == '=') {
779 *op = OP_ASSIGN;
780 linepos++;
781 } else if (linepos[0] == ':' && linepos[1] == '=') {
782 *op = OP_ASSIGN_FINAL;
783 linepos += 2;
784 } else
785 return -1;
786
787 /* terminate key */
788 temp[0] = '\0';
789
790 /* skip whitespace after operator */
791 while (isspace(linepos[0]))
792 linepos++;
793 if (linepos[0] == '\0')
794 return -1;
795
796 /* get the value */
797 if (linepos[0] == '"')
798 linepos++;
799 else
800 return -1;
801 *value = linepos;
802
803 /* terminate */
804 temp = strchr(linepos, '"');
805 if (!temp)
806 return -1;
807 temp[0] = '\0';
808 temp++;
809
810 /* move line to next key */
811 *line = temp;
812 return 0;
813 }
814
815 /* extract possible KEY{attr} */
816 static const char *get_key_attribute(struct udev *udev, char *str) {
817 char *pos;
818 char *attr;
819
820 attr = strchr(str, '{');
821 if (attr != NULL) {
822 attr++;
823 pos = strchr(attr, '}');
824 if (pos == NULL) {
825 log_error("missing closing brace for format");
826 return NULL;
827 }
828 pos[0] = '\0';
829 return attr;
830 }
831 return NULL;
832 }
833
834 static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
835 enum operation_type op,
836 const char *value, const void *data) {
837 struct token *token = &rule_tmp->token[rule_tmp->token_cur];
838 const char *attr = NULL;
839
840 memzero(token, sizeof(struct token));
841
842 switch (type) {
843 case TK_M_ACTION:
844 case TK_M_DEVPATH:
845 case TK_M_KERNEL:
846 case TK_M_SUBSYSTEM:
847 case TK_M_DRIVER:
848 case TK_M_WAITFOR:
849 case TK_M_DEVLINK:
850 case TK_M_NAME:
851 case TK_M_KERNELS:
852 case TK_M_SUBSYSTEMS:
853 case TK_M_DRIVERS:
854 case TK_M_TAGS:
855 case TK_M_PROGRAM:
856 case TK_M_IMPORT_FILE:
857 case TK_M_IMPORT_PROG:
858 case TK_M_IMPORT_DB:
859 case TK_M_IMPORT_CMDLINE:
860 case TK_M_IMPORT_PARENT:
861 case TK_M_RESULT:
862 case TK_A_OWNER:
863 case TK_A_GROUP:
864 case TK_A_MODE:
865 case TK_A_DEVLINK:
866 case TK_A_NAME:
867 case TK_A_GOTO:
868 case TK_M_TAG:
869 case TK_A_TAG:
870 case TK_A_STATIC_NODE:
871 token->key.value_off = rules_add_string(rule_tmp->rules, value);
872 break;
873 case TK_M_IMPORT_BUILTIN:
874 token->key.value_off = rules_add_string(rule_tmp->rules, value);
875 token->key.builtin_cmd = *(enum udev_builtin_cmd *)data;
876 break;
877 case TK_M_ENV:
878 case TK_M_ATTR:
879 case TK_M_SYSCTL:
880 case TK_M_ATTRS:
881 case TK_A_ATTR:
882 case TK_A_SYSCTL:
883 case TK_A_ENV:
884 case TK_A_SECLABEL:
885 attr = data;
886 token->key.value_off = rules_add_string(rule_tmp->rules, value);
887 token->key.attr_off = rules_add_string(rule_tmp->rules, attr);
888 break;
889 case TK_M_TEST:
890 token->key.value_off = rules_add_string(rule_tmp->rules, value);
891 if (data != NULL)
892 token->key.mode = *(mode_t *)data;
893 break;
894 case TK_A_STRING_ESCAPE_NONE:
895 case TK_A_STRING_ESCAPE_REPLACE:
896 case TK_A_DB_PERSIST:
897 break;
898 case TK_A_RUN_BUILTIN:
899 case TK_A_RUN_PROGRAM:
900 token->key.builtin_cmd = *(enum udev_builtin_cmd *)data;
901 token->key.value_off = rules_add_string(rule_tmp->rules, value);
902 break;
903 case TK_A_INOTIFY_WATCH:
904 case TK_A_DEVLINK_PRIO:
905 token->key.devlink_prio = *(int *)data;
906 break;
907 case TK_A_OWNER_ID:
908 token->key.uid = *(uid_t *)data;
909 break;
910 case TK_A_GROUP_ID:
911 token->key.gid = *(gid_t *)data;
912 break;
913 case TK_A_MODE_ID:
914 token->key.mode = *(mode_t *)data;
915 break;
916 case TK_RULE:
917 case TK_M_PARENTS_MIN:
918 case TK_M_PARENTS_MAX:
919 case TK_M_MAX:
920 case TK_END:
921 case TK_UNSET:
922 log_error("wrong type %u", type);
923 return -1;
924 }
925
926 if (value != NULL && type < TK_M_MAX) {
927 /* check if we need to split or call fnmatch() while matching rules */
928 enum string_glob_type glob;
929 int has_split;
930 int has_glob;
931
932 has_split = (strchr(value, '|') != NULL);
933 has_glob = string_is_glob(value);
934 if (has_split && has_glob) {
935 glob = GL_SPLIT_GLOB;
936 } else if (has_split) {
937 glob = GL_SPLIT;
938 } else if (has_glob) {
939 if (streq(value, "?*"))
940 glob = GL_SOMETHING;
941 else
942 glob = GL_GLOB;
943 } else {
944 glob = GL_PLAIN;
945 }
946 token->key.glob = glob;
947 }
948
949 if (value != NULL && type > TK_M_MAX) {
950 /* check if assigned value has substitution chars */
951 if (value[0] == '[')
952 token->key.subst = SB_SUBSYS;
953 else if (strchr(value, '%') != NULL || strchr(value, '$') != NULL)
954 token->key.subst = SB_FORMAT;
955 else
956 token->key.subst = SB_NONE;
957 }
958
959 if (attr != NULL) {
960 /* check if property/attribute name has substitution chars */
961 if (attr[0] == '[')
962 token->key.attrsubst = SB_SUBSYS;
963 else if (strchr(attr, '%') != NULL || strchr(attr, '$') != NULL)
964 token->key.attrsubst = SB_FORMAT;
965 else
966 token->key.attrsubst = SB_NONE;
967 }
968
969 token->key.type = type;
970 token->key.op = op;
971 rule_tmp->token_cur++;
972 if (rule_tmp->token_cur >= ELEMENTSOF(rule_tmp->token)) {
973 log_error("temporary rule array too small");
974 return -1;
975 }
976 return 0;
977 }
978
979 static int sort_token(struct udev_rules *rules, struct rule_tmp *rule_tmp) {
980 unsigned int i;
981 unsigned int start = 0;
982 unsigned int end = rule_tmp->token_cur;
983
984 for (i = 0; i < rule_tmp->token_cur; i++) {
985 enum token_type next_val = TK_UNSET;
986 unsigned int next_idx = 0;
987 unsigned int j;
988
989 /* find smallest value */
990 for (j = start; j < end; j++) {
991 if (rule_tmp->token[j].type == TK_UNSET)
992 continue;
993 if (next_val == TK_UNSET || rule_tmp->token[j].type < next_val) {
994 next_val = rule_tmp->token[j].type;
995 next_idx = j;
996 }
997 }
998
999 /* add token and mark done */
1000 if (add_token(rules, &rule_tmp->token[next_idx]) != 0)
1001 return -1;
1002 rule_tmp->token[next_idx].type = TK_UNSET;
1003
1004 /* shrink range */
1005 if (next_idx == start)
1006 start++;
1007 if (next_idx+1 == end)
1008 end--;
1009 }
1010 return 0;
1011 }
1012
1013 static int add_rule(struct udev_rules *rules, char *line,
1014 const char *filename, unsigned int filename_off, unsigned int lineno) {
1015 char *linepos;
1016 const char *attr;
1017 struct rule_tmp rule_tmp = {
1018 .rules = rules,
1019 .rule.type = TK_RULE,
1020 };
1021
1022 /* the offset in the rule is limited to unsigned short */
1023 if (filename_off < USHRT_MAX)
1024 rule_tmp.rule.rule.filename_off = filename_off;
1025 rule_tmp.rule.rule.filename_line = lineno;
1026
1027 linepos = line;
1028 for (;;) {
1029 char *key;
1030 char *value;
1031 enum operation_type op;
1032
1033 if (get_key(rules->udev, &linepos, &key, &op, &value) != 0) {
1034 /* Avoid erroring on trailing whitespace. This is probably rare
1035 * so save the work for the error case instead of always trying
1036 * to strip the trailing whitespace with strstrip(). */
1037 while (isblank(*linepos))
1038 linepos++;
1039
1040 /* If we aren't at the end of the line, this is a parsing error.
1041 * Make a best effort to describe where the problem is. */
1042 if (!strchr(NEWLINE, *linepos)) {
1043 char buf[2] = {*linepos};
1044 _cleanup_free_ char *tmp;
1045
1046 tmp = cescape(buf);
1047 log_error("invalid key/value pair in file %s on line %u, starting at character %tu ('%s')",
1048 filename, lineno, linepos - line + 1, tmp);
1049 if (*linepos == '#')
1050 log_error("hint: comments can only start at beginning of line");
1051 }
1052 break;
1053 }
1054
1055 if (streq(key, "ACTION")) {
1056 if (op > OP_MATCH_MAX) {
1057 log_error("invalid ACTION operation");
1058 goto invalid;
1059 }
1060 rule_add_key(&rule_tmp, TK_M_ACTION, op, value, NULL);
1061 continue;
1062 }
1063
1064 if (streq(key, "DEVPATH")) {
1065 if (op > OP_MATCH_MAX) {
1066 log_error("invalid DEVPATH operation");
1067 goto invalid;
1068 }
1069 rule_add_key(&rule_tmp, TK_M_DEVPATH, op, value, NULL);
1070 continue;
1071 }
1072
1073 if (streq(key, "KERNEL")) {
1074 if (op > OP_MATCH_MAX) {
1075 log_error("invalid KERNEL operation");
1076 goto invalid;
1077 }
1078 rule_add_key(&rule_tmp, TK_M_KERNEL, op, value, NULL);
1079 continue;
1080 }
1081
1082 if (streq(key, "SUBSYSTEM")) {
1083 if (op > OP_MATCH_MAX) {
1084 log_error("invalid SUBSYSTEM operation");
1085 goto invalid;
1086 }
1087 /* bus, class, subsystem events should all be the same */
1088 if (streq(value, "subsystem") ||
1089 streq(value, "bus") ||
1090 streq(value, "class")) {
1091 if (streq(value, "bus") || streq(value, "class"))
1092 log_error("'%s' must be specified as 'subsystem' "
1093 "please fix it in %s:%u", value, filename, lineno);
1094 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, "subsystem|class|bus", NULL);
1095 } else
1096 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, value, NULL);
1097 continue;
1098 }
1099
1100 if (streq(key, "DRIVER")) {
1101 if (op > OP_MATCH_MAX) {
1102 log_error("invalid DRIVER operation");
1103 goto invalid;
1104 }
1105 rule_add_key(&rule_tmp, TK_M_DRIVER, op, value, NULL);
1106 continue;
1107 }
1108
1109 if (startswith(key, "ATTR{")) {
1110 attr = get_key_attribute(rules->udev, key + strlen("ATTR"));
1111 if (attr == NULL) {
1112 log_error("error parsing ATTR attribute");
1113 goto invalid;
1114 }
1115 if (op == OP_REMOVE) {
1116 log_error("invalid ATTR operation");
1117 goto invalid;
1118 }
1119 if (op < OP_MATCH_MAX)
1120 rule_add_key(&rule_tmp, TK_M_ATTR, op, value, attr);
1121 else
1122 rule_add_key(&rule_tmp, TK_A_ATTR, op, value, attr);
1123 continue;
1124 }
1125
1126 if (startswith(key, "SYSCTL{")) {
1127 attr = get_key_attribute(rules->udev, key + strlen("SYSCTL"));
1128 if (attr == NULL) {
1129 log_error("error parsing SYSCTL attribute");
1130 goto invalid;
1131 }
1132 if (op == OP_REMOVE) {
1133 log_error("invalid SYSCTL operation");
1134 goto invalid;
1135 }
1136 if (op < OP_MATCH_MAX)
1137 rule_add_key(&rule_tmp, TK_M_SYSCTL, op, value, attr);
1138 else
1139 rule_add_key(&rule_tmp, TK_A_SYSCTL, op, value, attr);
1140 continue;
1141 }
1142
1143 if (startswith(key, "SECLABEL{")) {
1144 attr = get_key_attribute(rules->udev, key + strlen("SECLABEL"));
1145 if (!attr) {
1146 log_error("error parsing SECLABEL attribute");
1147 goto invalid;
1148 }
1149 if (op == OP_REMOVE) {
1150 log_error("invalid SECLABEL operation");
1151 goto invalid;
1152 }
1153
1154 rule_add_key(&rule_tmp, TK_A_SECLABEL, op, value, attr);
1155 continue;
1156 }
1157
1158 if (streq(key, "KERNELS")) {
1159 if (op > OP_MATCH_MAX) {
1160 log_error("invalid KERNELS operation");
1161 goto invalid;
1162 }
1163 rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1164 continue;
1165 }
1166
1167 if (streq(key, "SUBSYSTEMS")) {
1168 if (op > OP_MATCH_MAX) {
1169 log_error("invalid SUBSYSTEMS operation");
1170 goto invalid;
1171 }
1172 rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1173 continue;
1174 }
1175
1176 if (streq(key, "DRIVERS")) {
1177 if (op > OP_MATCH_MAX) {
1178 log_error("invalid DRIVERS operation");
1179 goto invalid;
1180 }
1181 rule_add_key(&rule_tmp, TK_M_DRIVERS, op, value, NULL);
1182 continue;
1183 }
1184
1185 if (startswith(key, "ATTRS{")) {
1186 if (op > OP_MATCH_MAX) {
1187 log_error("invalid ATTRS operation");
1188 goto invalid;
1189 }
1190 attr = get_key_attribute(rules->udev, key + strlen("ATTRS"));
1191 if (attr == NULL) {
1192 log_error("error parsing ATTRS attribute");
1193 goto invalid;
1194 }
1195 if (startswith(attr, "device/"))
1196 log_error("the 'device' link may not be available in a future kernel, "
1197 "please fix it in %s:%u", filename, lineno);
1198 else if (strstr(attr, "../") != NULL)
1199 log_error("do not reference parent sysfs directories directly, "
1200 "it may break with a future kernel, please fix it in %s:%u", filename, lineno);
1201 rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1202 continue;
1203 }
1204
1205 if (streq(key, "TAGS")) {
1206 if (op > OP_MATCH_MAX) {
1207 log_error("invalid TAGS operation");
1208 goto invalid;
1209 }
1210 rule_add_key(&rule_tmp, TK_M_TAGS, op, value, NULL);
1211 continue;
1212 }
1213
1214 if (startswith(key, "ENV{")) {
1215 attr = get_key_attribute(rules->udev, key + strlen("ENV"));
1216 if (attr == NULL) {
1217 log_error("error parsing ENV attribute");
1218 goto invalid;
1219 }
1220 if (op == OP_REMOVE) {
1221 log_error("invalid ENV operation");
1222 goto invalid;
1223 }
1224 if (op < OP_MATCH_MAX) {
1225 if (rule_add_key(&rule_tmp, TK_M_ENV, op, value, attr) != 0)
1226 goto invalid;
1227 } else {
1228 static const char *blacklist[] = {
1229 "ACTION",
1230 "SUBSYSTEM",
1231 "DEVTYPE",
1232 "MAJOR",
1233 "MINOR",
1234 "DRIVER",
1235 "IFINDEX",
1236 "DEVNAME",
1237 "DEVLINKS",
1238 "DEVPATH",
1239 "TAGS",
1240 };
1241 unsigned int i;
1242
1243 for (i = 0; i < ELEMENTSOF(blacklist); i++) {
1244 if (!streq(attr, blacklist[i]))
1245 continue;
1246 log_error("invalid ENV attribute, '%s' can not be set %s:%u", attr, filename, lineno);
1247 goto invalid;
1248 }
1249 if (rule_add_key(&rule_tmp, TK_A_ENV, op, value, attr) != 0)
1250 goto invalid;
1251 }
1252 continue;
1253 }
1254
1255 if (streq(key, "TAG")) {
1256 if (op < OP_MATCH_MAX)
1257 rule_add_key(&rule_tmp, TK_M_TAG, op, value, NULL);
1258 else
1259 rule_add_key(&rule_tmp, TK_A_TAG, op, value, NULL);
1260 continue;
1261 }
1262
1263 if (streq(key, "PROGRAM")) {
1264 if (op == OP_REMOVE) {
1265 log_error("invalid PROGRAM operation");
1266 goto invalid;
1267 }
1268 rule_add_key(&rule_tmp, TK_M_PROGRAM, op, value, NULL);
1269 continue;
1270 }
1271
1272 if (streq(key, "RESULT")) {
1273 if (op > OP_MATCH_MAX) {
1274 log_error("invalid RESULT operation");
1275 goto invalid;
1276 }
1277 rule_add_key(&rule_tmp, TK_M_RESULT, op, value, NULL);
1278 continue;
1279 }
1280
1281 if (startswith(key, "IMPORT")) {
1282 attr = get_key_attribute(rules->udev, key + strlen("IMPORT"));
1283 if (attr == NULL) {
1284 log_error("IMPORT{} type missing, ignoring IMPORT %s:%u", filename, lineno);
1285 continue;
1286 }
1287 if (op == OP_REMOVE) {
1288 log_error("invalid IMPORT operation");
1289 goto invalid;
1290 }
1291 if (streq(attr, "program")) {
1292 /* find known built-in command */
1293 if (value[0] != '/') {
1294 enum udev_builtin_cmd cmd;
1295
1296 cmd = udev_builtin_lookup(value);
1297 if (cmd < UDEV_BUILTIN_MAX) {
1298 log_debug("IMPORT found builtin '%s', replacing %s:%u",
1299 value, filename, lineno);
1300 rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, value, &cmd);
1301 continue;
1302 }
1303 }
1304 rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1305 } else if (streq(attr, "builtin")) {
1306 enum udev_builtin_cmd cmd = udev_builtin_lookup(value);
1307
1308 if (cmd < UDEV_BUILTIN_MAX)
1309 rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, value, &cmd);
1310 else
1311 log_error("IMPORT{builtin}: '%s' unknown %s:%u", value, filename, lineno);
1312 } else if (streq(attr, "file")) {
1313 rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1314 } else if (streq(attr, "db")) {
1315 rule_add_key(&rule_tmp, TK_M_IMPORT_DB, op, value, NULL);
1316 } else if (streq(attr, "cmdline")) {
1317 rule_add_key(&rule_tmp, TK_M_IMPORT_CMDLINE, op, value, NULL);
1318 } else if (streq(attr, "parent")) {
1319 rule_add_key(&rule_tmp, TK_M_IMPORT_PARENT, op, value, NULL);
1320 } else
1321 log_error("IMPORT{} unknown type, ignoring IMPORT %s:%u", filename, lineno);
1322 continue;
1323 }
1324
1325 if (startswith(key, "TEST")) {
1326 mode_t mode = 0;
1327
1328 if (op > OP_MATCH_MAX) {
1329 log_error("invalid TEST operation");
1330 goto invalid;
1331 }
1332 attr = get_key_attribute(rules->udev, key + strlen("TEST"));
1333 if (attr != NULL) {
1334 mode = strtol(attr, NULL, 8);
1335 rule_add_key(&rule_tmp, TK_M_TEST, op, value, &mode);
1336 } else {
1337 rule_add_key(&rule_tmp, TK_M_TEST, op, value, NULL);
1338 }
1339 continue;
1340 }
1341
1342 if (startswith(key, "RUN")) {
1343 attr = get_key_attribute(rules->udev, key + strlen("RUN"));
1344 if (attr == NULL)
1345 attr = "program";
1346 if (op == OP_REMOVE) {
1347 log_error("invalid RUN operation");
1348 goto invalid;
1349 }
1350
1351 if (streq(attr, "builtin")) {
1352 enum udev_builtin_cmd cmd = udev_builtin_lookup(value);
1353
1354 if (cmd < UDEV_BUILTIN_MAX)
1355 rule_add_key(&rule_tmp, TK_A_RUN_BUILTIN, op, value, &cmd);
1356 else
1357 log_error("RUN{builtin}: '%s' unknown %s:%u", value, filename, lineno);
1358 } else if (streq(attr, "program")) {
1359 enum udev_builtin_cmd cmd = UDEV_BUILTIN_MAX;
1360
1361 rule_add_key(&rule_tmp, TK_A_RUN_PROGRAM, op, value, &cmd);
1362 } else {
1363 log_error("RUN{} unknown type, ignoring RUN %s:%u", filename, lineno);
1364 }
1365
1366 continue;
1367 }
1368
1369 if (streq(key, "LABEL")) {
1370 if (op == OP_REMOVE) {
1371 log_error("invalid LABEL operation");
1372 goto invalid;
1373 }
1374 rule_tmp.rule.rule.label_off = rules_add_string(rules, value);
1375 continue;
1376 }
1377
1378 if (streq(key, "GOTO")) {
1379 if (op == OP_REMOVE) {
1380 log_error("invalid GOTO operation");
1381 goto invalid;
1382 }
1383 rule_add_key(&rule_tmp, TK_A_GOTO, 0, value, NULL);
1384 continue;
1385 }
1386
1387 if (startswith(key, "NAME")) {
1388 if (op == OP_REMOVE) {
1389 log_error("invalid NAME operation");
1390 goto invalid;
1391 }
1392 if (op < OP_MATCH_MAX) {
1393 rule_add_key(&rule_tmp, TK_M_NAME, op, value, NULL);
1394 } else {
1395 if (streq(value, "%k")) {
1396 log_error("NAME=\"%%k\" is ignored, because it breaks kernel supplied names, "
1397 "please remove it from %s:%u\n", filename, lineno);
1398 continue;
1399 }
1400 if (value[0] == '\0') {
1401 log_debug("NAME=\"\" is ignored, because udev will not delete any device nodes, "
1402 "please remove it from %s:%u\n", filename, lineno);
1403 continue;
1404 }
1405 rule_add_key(&rule_tmp, TK_A_NAME, op, value, NULL);
1406 }
1407 rule_tmp.rule.rule.can_set_name = true;
1408 continue;
1409 }
1410
1411 if (streq(key, "SYMLINK")) {
1412 if (op == OP_REMOVE) {
1413 log_error("invalid SYMLINK operation");
1414 goto invalid;
1415 }
1416 if (op < OP_MATCH_MAX)
1417 rule_add_key(&rule_tmp, TK_M_DEVLINK, op, value, NULL);
1418 else
1419 rule_add_key(&rule_tmp, TK_A_DEVLINK, op, value, NULL);
1420 rule_tmp.rule.rule.can_set_name = true;
1421 continue;
1422 }
1423
1424 if (streq(key, "OWNER")) {
1425 uid_t uid;
1426 char *endptr;
1427
1428 if (op == OP_REMOVE) {
1429 log_error("invalid OWNER operation");
1430 goto invalid;
1431 }
1432
1433 uid = strtoul(value, &endptr, 10);
1434 if (endptr[0] == '\0') {
1435 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1436 } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1437 uid = add_uid(rules, value);
1438 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1439 } else if (rules->resolve_names >= 0)
1440 rule_add_key(&rule_tmp, TK_A_OWNER, op, value, NULL);
1441
1442 rule_tmp.rule.rule.can_set_name = true;
1443 continue;
1444 }
1445
1446 if (streq(key, "GROUP")) {
1447 gid_t gid;
1448 char *endptr;
1449
1450 if (op == OP_REMOVE) {
1451 log_error("invalid GROUP operation");
1452 goto invalid;
1453 }
1454
1455 gid = strtoul(value, &endptr, 10);
1456 if (endptr[0] == '\0') {
1457 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1458 } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1459 gid = add_gid(rules, value);
1460 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1461 } else if (rules->resolve_names >= 0)
1462 rule_add_key(&rule_tmp, TK_A_GROUP, op, value, NULL);
1463
1464 rule_tmp.rule.rule.can_set_name = true;
1465 continue;
1466 }
1467
1468 if (streq(key, "MODE")) {
1469 mode_t mode;
1470 char *endptr;
1471
1472 if (op == OP_REMOVE) {
1473 log_error("invalid MODE operation");
1474 goto invalid;
1475 }
1476
1477 mode = strtol(value, &endptr, 8);
1478 if (endptr[0] == '\0')
1479 rule_add_key(&rule_tmp, TK_A_MODE_ID, op, NULL, &mode);
1480 else
1481 rule_add_key(&rule_tmp, TK_A_MODE, op, value, NULL);
1482 rule_tmp.rule.rule.can_set_name = true;
1483 continue;
1484 }
1485
1486 if (streq(key, "OPTIONS")) {
1487 const char *pos;
1488
1489 if (op == OP_REMOVE) {
1490 log_error("invalid OPTIONS operation");
1491 goto invalid;
1492 }
1493
1494 pos = strstr(value, "link_priority=");
1495 if (pos != NULL) {
1496 int prio = atoi(&pos[strlen("link_priority=")]);
1497
1498 rule_add_key(&rule_tmp, TK_A_DEVLINK_PRIO, op, NULL, &prio);
1499 }
1500
1501 pos = strstr(value, "string_escape=");
1502 if (pos != NULL) {
1503 pos = &pos[strlen("string_escape=")];
1504 if (startswith(pos, "none"))
1505 rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_NONE, op, NULL, NULL);
1506 else if (startswith(pos, "replace"))
1507 rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_REPLACE, op, NULL, NULL);
1508 }
1509
1510 pos = strstr(value, "db_persist");
1511 if (pos != NULL)
1512 rule_add_key(&rule_tmp, TK_A_DB_PERSIST, op, NULL, NULL);
1513
1514 pos = strstr(value, "nowatch");
1515 if (pos != NULL) {
1516 const int off = 0;
1517
1518 rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &off);
1519 } else {
1520 pos = strstr(value, "watch");
1521 if (pos != NULL) {
1522 const int on = 1;
1523
1524 rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &on);
1525 }
1526 }
1527
1528 pos = strstr(value, "static_node=");
1529 if (pos != NULL) {
1530 rule_add_key(&rule_tmp, TK_A_STATIC_NODE, op, &pos[strlen("static_node=")], NULL);
1531 rule_tmp.rule.rule.has_static_node = true;
1532 }
1533
1534 continue;
1535 }
1536
1537 log_error("unknown key '%s' in %s:%u", key, filename, lineno);
1538 goto invalid;
1539 }
1540
1541 /* add rule token */
1542 rule_tmp.rule.rule.token_count = 1 + rule_tmp.token_cur;
1543 if (add_token(rules, &rule_tmp.rule) != 0)
1544 goto invalid;
1545
1546 /* add tokens to list, sorted by type */
1547 if (sort_token(rules, &rule_tmp) != 0)
1548 goto invalid;
1549
1550 return 0;
1551 invalid:
1552 log_error("invalid rule '%s:%u'", filename, lineno);
1553 return -1;
1554 }
1555
1556 static int parse_file(struct udev_rules *rules, const char *filename) {
1557 _cleanup_fclose_ FILE *f = NULL;
1558 unsigned int first_token;
1559 unsigned int filename_off;
1560 char line[UTIL_LINE_SIZE];
1561 int line_nr = 0;
1562 unsigned int i;
1563
1564 f = fopen(filename, "re");
1565 if (!f) {
1566 if (errno == ENOENT)
1567 return 0;
1568 else
1569 return -errno;
1570 }
1571
1572 if (null_or_empty_fd(fileno(f))) {
1573 log_debug("Skipping empty file: %s", filename);
1574 return 0;
1575 } else
1576 log_debug("Reading rules file: %s", filename);
1577
1578 first_token = rules->token_cur;
1579 filename_off = rules_add_string(rules, filename);
1580
1581 while (fgets(line, sizeof(line), f) != NULL) {
1582 char *key;
1583 size_t len;
1584
1585 /* skip whitespace */
1586 line_nr++;
1587 key = line;
1588 while (isspace(key[0]))
1589 key++;
1590
1591 /* comment */
1592 if (key[0] == '#')
1593 continue;
1594
1595 len = strlen(line);
1596 if (len < 3)
1597 continue;
1598
1599 /* continue reading if backslash+newline is found */
1600 while (line[len-2] == '\\') {
1601 if (fgets(&line[len-2], (sizeof(line)-len)+2, f) == NULL)
1602 break;
1603 if (strlen(&line[len-2]) < 2)
1604 break;
1605 line_nr++;
1606 len = strlen(line);
1607 }
1608
1609 if (len+1 >= sizeof(line)) {
1610 log_error("line too long '%s':%u, ignored", filename, line_nr);
1611 continue;
1612 }
1613 add_rule(rules, key, filename, filename_off, line_nr);
1614 }
1615
1616 /* link GOTOs to LABEL rules in this file to be able to fast-forward */
1617 for (i = first_token+1; i < rules->token_cur; i++) {
1618 if (rules->tokens[i].type == TK_A_GOTO) {
1619 char *label = rules_str(rules, rules->tokens[i].key.value_off);
1620 unsigned int j;
1621
1622 for (j = i+1; j < rules->token_cur; j++) {
1623 if (rules->tokens[j].type != TK_RULE)
1624 continue;
1625 if (rules->tokens[j].rule.label_off == 0)
1626 continue;
1627 if (!streq(label, rules_str(rules, rules->tokens[j].rule.label_off)))
1628 continue;
1629 rules->tokens[i].key.rule_goto = j;
1630 break;
1631 }
1632 if (rules->tokens[i].key.rule_goto == 0)
1633 log_error("GOTO '%s' has no matching label in: '%s'", label, filename);
1634 }
1635 }
1636 return 0;
1637 }
1638
1639 struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names) {
1640 struct udev_rules *rules;
1641 struct udev_list file_list;
1642 struct token end_token;
1643 char **files, **f;
1644 int r;
1645
1646 rules = new0(struct udev_rules, 1);
1647 if (rules == NULL)
1648 return NULL;
1649 rules->udev = udev;
1650 rules->resolve_names = resolve_names;
1651 udev_list_init(udev, &file_list, true);
1652
1653 /* init token array and string buffer */
1654 rules->tokens = malloc(PREALLOC_TOKEN * sizeof(struct token));
1655 if (rules->tokens == NULL)
1656 return udev_rules_unref(rules);
1657 rules->token_max = PREALLOC_TOKEN;
1658
1659 rules->strbuf = strbuf_new();
1660 if (!rules->strbuf)
1661 return udev_rules_unref(rules);
1662
1663 udev_rules_check_timestamp(rules);
1664
1665 r = conf_files_list_strv(&files, ".rules", NULL, rules_dirs);
1666 if (r < 0) {
1667 log_error_errno(r, "failed to enumerate rules files: %m");
1668 return udev_rules_unref(rules);
1669 }
1670
1671 /*
1672 * The offset value in the rules strct is limited; add all
1673 * rules file names to the beginning of the string buffer.
1674 */
1675 STRV_FOREACH(f, files)
1676 rules_add_string(rules, *f);
1677
1678 STRV_FOREACH(f, files)
1679 parse_file(rules, *f);
1680
1681 strv_free(files);
1682
1683 memzero(&end_token, sizeof(struct token));
1684 end_token.type = TK_END;
1685 add_token(rules, &end_token);
1686 log_debug("rules contain %zu bytes tokens (%u * %zu bytes), %zu bytes strings",
1687 rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->strbuf->len);
1688
1689 /* cleanup temporary strbuf data */
1690 log_debug("%zu strings (%zu bytes), %zu de-duplicated (%zu bytes), %zu trie nodes used",
1691 rules->strbuf->in_count, rules->strbuf->in_len,
1692 rules->strbuf->dedup_count, rules->strbuf->dedup_len, rules->strbuf->nodes_count);
1693 strbuf_complete(rules->strbuf);
1694
1695 /* cleanup uid/gid cache */
1696 rules->uids = mfree(rules->uids);
1697 rules->uids_cur = 0;
1698 rules->uids_max = 0;
1699 rules->gids = mfree(rules->gids);
1700 rules->gids_cur = 0;
1701 rules->gids_max = 0;
1702
1703 dump_rules(rules);
1704 return rules;
1705 }
1706
1707 struct udev_rules *udev_rules_unref(struct udev_rules *rules) {
1708 if (rules == NULL)
1709 return NULL;
1710 free(rules->tokens);
1711 strbuf_cleanup(rules->strbuf);
1712 free(rules->uids);
1713 free(rules->gids);
1714 free(rules);
1715 return NULL;
1716 }
1717
1718 bool udev_rules_check_timestamp(struct udev_rules *rules) {
1719 if (!rules)
1720 return false;
1721
1722 return paths_check_timestamp(rules_dirs, &rules->dirs_ts_usec, true);
1723 }
1724
1725 static int match_key(struct udev_rules *rules, struct token *token, const char *val) {
1726 char *key_value = rules_str(rules, token->key.value_off);
1727 char *pos;
1728 bool match = false;
1729
1730 if (val == NULL)
1731 val = "";
1732
1733 switch (token->key.glob) {
1734 case GL_PLAIN:
1735 match = (streq(key_value, val));
1736 break;
1737 case GL_GLOB:
1738 match = (fnmatch(key_value, val, 0) == 0);
1739 break;
1740 case GL_SPLIT:
1741 {
1742 const char *s;
1743 size_t len;
1744
1745 s = rules_str(rules, token->key.value_off);
1746 len = strlen(val);
1747 for (;;) {
1748 const char *next;
1749
1750 next = strchr(s, '|');
1751 if (next != NULL) {
1752 size_t matchlen = (size_t)(next - s);
1753
1754 match = (matchlen == len && strneq(s, val, matchlen));
1755 if (match)
1756 break;
1757 } else {
1758 match = (streq(s, val));
1759 break;
1760 }
1761 s = &next[1];
1762 }
1763 break;
1764 }
1765 case GL_SPLIT_GLOB:
1766 {
1767 char value[UTIL_PATH_SIZE];
1768
1769 strscpy(value, sizeof(value), rules_str(rules, token->key.value_off));
1770 key_value = value;
1771 while (key_value != NULL) {
1772 pos = strchr(key_value, '|');
1773 if (pos != NULL) {
1774 pos[0] = '\0';
1775 pos = &pos[1];
1776 }
1777 match = (fnmatch(key_value, val, 0) == 0);
1778 if (match)
1779 break;
1780 key_value = pos;
1781 }
1782 break;
1783 }
1784 case GL_SOMETHING:
1785 match = (val[0] != '\0');
1786 break;
1787 case GL_UNSET:
1788 return -1;
1789 }
1790
1791 if (match && (token->key.op == OP_MATCH))
1792 return 0;
1793 if (!match && (token->key.op == OP_NOMATCH))
1794 return 0;
1795 return -1;
1796 }
1797
1798 static int match_attr(struct udev_rules *rules, struct udev_device *dev, struct udev_event *event, struct token *cur) {
1799 const char *name;
1800 char nbuf[UTIL_NAME_SIZE];
1801 const char *value;
1802 char vbuf[UTIL_NAME_SIZE];
1803 size_t len;
1804
1805 name = rules_str(rules, cur->key.attr_off);
1806 switch (cur->key.attrsubst) {
1807 case SB_FORMAT:
1808 udev_event_apply_format(event, name, nbuf, sizeof(nbuf));
1809 name = nbuf;
1810 /* fall through */
1811 case SB_NONE:
1812 value = udev_device_get_sysattr_value(dev, name);
1813 if (value == NULL)
1814 return -1;
1815 break;
1816 case SB_SUBSYS:
1817 if (util_resolve_subsys_kernel(event->udev, name, vbuf, sizeof(vbuf), 1) != 0)
1818 return -1;
1819 value = vbuf;
1820 break;
1821 default:
1822 return -1;
1823 }
1824
1825 /* remove trailing whitespace, if not asked to match for it */
1826 len = strlen(value);
1827 if (len > 0 && isspace(value[len-1])) {
1828 const char *key_value;
1829 size_t klen;
1830
1831 key_value = rules_str(rules, cur->key.value_off);
1832 klen = strlen(key_value);
1833 if (klen > 0 && !isspace(key_value[klen-1])) {
1834 if (value != vbuf) {
1835 strscpy(vbuf, sizeof(vbuf), value);
1836 value = vbuf;
1837 }
1838 while (len > 0 && isspace(vbuf[--len]))
1839 vbuf[len] = '\0';
1840 }
1841 }
1842
1843 return match_key(rules, cur, value);
1844 }
1845
1846 enum escape_type {
1847 ESCAPE_UNSET,
1848 ESCAPE_NONE,
1849 ESCAPE_REPLACE,
1850 };
1851
1852 int udev_rules_apply_to_event(struct udev_rules *rules,
1853 struct udev_event *event,
1854 usec_t timeout_usec,
1855 usec_t timeout_warn_usec,
1856 struct udev_list *properties_list) {
1857 struct token *cur;
1858 struct token *rule;
1859 enum escape_type esc = ESCAPE_UNSET;
1860 bool can_set_name;
1861
1862 if (rules->tokens == NULL)
1863 return -1;
1864
1865 can_set_name = ((!streq(udev_device_get_action(event->dev), "remove")) &&
1866 (major(udev_device_get_devnum(event->dev)) > 0 ||
1867 udev_device_get_ifindex(event->dev) > 0));
1868
1869 /* loop through token list, match, run actions or forward to next rule */
1870 cur = &rules->tokens[0];
1871 rule = cur;
1872 for (;;) {
1873 dump_token(rules, cur);
1874 switch (cur->type) {
1875 case TK_RULE:
1876 /* current rule */
1877 rule = cur;
1878 /* possibly skip rules which want to set NAME, SYMLINK, OWNER, GROUP, MODE */
1879 if (!can_set_name && rule->rule.can_set_name)
1880 goto nomatch;
1881 esc = ESCAPE_UNSET;
1882 break;
1883 case TK_M_ACTION:
1884 if (match_key(rules, cur, udev_device_get_action(event->dev)) != 0)
1885 goto nomatch;
1886 break;
1887 case TK_M_DEVPATH:
1888 if (match_key(rules, cur, udev_device_get_devpath(event->dev)) != 0)
1889 goto nomatch;
1890 break;
1891 case TK_M_KERNEL:
1892 if (match_key(rules, cur, udev_device_get_sysname(event->dev)) != 0)
1893 goto nomatch;
1894 break;
1895 case TK_M_DEVLINK: {
1896 struct udev_list_entry *list_entry;
1897 bool match = false;
1898
1899 udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(event->dev)) {
1900 const char *devlink;
1901
1902 devlink = udev_list_entry_get_name(list_entry) + strlen("/dev/");
1903 if (match_key(rules, cur, devlink) == 0) {
1904 match = true;
1905 break;
1906 }
1907 }
1908 if (!match)
1909 goto nomatch;
1910 break;
1911 }
1912 case TK_M_NAME:
1913 if (match_key(rules, cur, event->name) != 0)
1914 goto nomatch;
1915 break;
1916 case TK_M_ENV: {
1917 const char *key_name = rules_str(rules, cur->key.attr_off);
1918 const char *value;
1919
1920 value = udev_device_get_property_value(event->dev, key_name);
1921
1922 /* check global properties */
1923 if (!value && properties_list) {
1924 struct udev_list_entry *list_entry;
1925
1926 list_entry = udev_list_get_entry(properties_list);
1927 list_entry = udev_list_entry_get_by_name(list_entry, key_name);
1928 if (list_entry != NULL)
1929 value = udev_list_entry_get_value(list_entry);
1930 }
1931
1932 if (!value)
1933 value = "";
1934 if (match_key(rules, cur, value))
1935 goto nomatch;
1936 break;
1937 }
1938 case TK_M_TAG: {
1939 struct udev_list_entry *list_entry;
1940 bool match = false;
1941
1942 udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(event->dev)) {
1943 if (streq(rules_str(rules, cur->key.value_off), udev_list_entry_get_name(list_entry))) {
1944 match = true;
1945 break;
1946 }
1947 }
1948 if ((!match && (cur->key.op != OP_NOMATCH)) ||
1949 (match && (cur->key.op == OP_NOMATCH)))
1950 goto nomatch;
1951 break;
1952 }
1953 case TK_M_SUBSYSTEM:
1954 if (match_key(rules, cur, udev_device_get_subsystem(event->dev)) != 0)
1955 goto nomatch;
1956 break;
1957 case TK_M_DRIVER:
1958 if (match_key(rules, cur, udev_device_get_driver(event->dev)) != 0)
1959 goto nomatch;
1960 break;
1961 case TK_M_ATTR:
1962 if (match_attr(rules, event->dev, event, cur) != 0)
1963 goto nomatch;
1964 break;
1965 case TK_M_SYSCTL: {
1966 char filename[UTIL_PATH_SIZE];
1967 _cleanup_free_ char *value = NULL;
1968 size_t len;
1969
1970 udev_event_apply_format(event, rules_str(rules, cur->key.attr_off), filename, sizeof(filename));
1971 sysctl_normalize(filename);
1972 if (sysctl_read(filename, &value) < 0)
1973 goto nomatch;
1974
1975 len = strlen(value);
1976 while (len > 0 && isspace(value[--len]))
1977 value[len] = '\0';
1978 if (match_key(rules, cur, value) != 0)
1979 goto nomatch;
1980 break;
1981 }
1982 case TK_M_KERNELS:
1983 case TK_M_SUBSYSTEMS:
1984 case TK_M_DRIVERS:
1985 case TK_M_ATTRS:
1986 case TK_M_TAGS: {
1987 struct token *next;
1988
1989 /* get whole sequence of parent matches */
1990 next = cur;
1991 while (next->type > TK_M_PARENTS_MIN && next->type < TK_M_PARENTS_MAX)
1992 next++;
1993
1994 /* loop over parents */
1995 event->dev_parent = event->dev;
1996 for (;;) {
1997 struct token *key;
1998
1999 /* loop over sequence of parent match keys */
2000 for (key = cur; key < next; key++ ) {
2001 dump_token(rules, key);
2002 switch(key->type) {
2003 case TK_M_KERNELS:
2004 if (match_key(rules, key, udev_device_get_sysname(event->dev_parent)) != 0)
2005 goto try_parent;
2006 break;
2007 case TK_M_SUBSYSTEMS:
2008 if (match_key(rules, key, udev_device_get_subsystem(event->dev_parent)) != 0)
2009 goto try_parent;
2010 break;
2011 case TK_M_DRIVERS:
2012 if (match_key(rules, key, udev_device_get_driver(event->dev_parent)) != 0)
2013 goto try_parent;
2014 break;
2015 case TK_M_ATTRS:
2016 if (match_attr(rules, event->dev_parent, event, key) != 0)
2017 goto try_parent;
2018 break;
2019 case TK_M_TAGS: {
2020 bool match = udev_device_has_tag(event->dev_parent, rules_str(rules, cur->key.value_off));
2021
2022 if (match && key->key.op == OP_NOMATCH)
2023 goto try_parent;
2024 if (!match && key->key.op == OP_MATCH)
2025 goto try_parent;
2026 break;
2027 }
2028 default:
2029 goto nomatch;
2030 }
2031 }
2032 break;
2033
2034 try_parent:
2035 event->dev_parent = udev_device_get_parent(event->dev_parent);
2036 if (event->dev_parent == NULL)
2037 goto nomatch;
2038 }
2039 /* move behind our sequence of parent match keys */
2040 cur = next;
2041 continue;
2042 }
2043 case TK_M_TEST: {
2044 char filename[UTIL_PATH_SIZE];
2045 struct stat statbuf;
2046 int match;
2047
2048 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), filename, sizeof(filename));
2049 if (util_resolve_subsys_kernel(event->udev, filename, filename, sizeof(filename), 0) != 0) {
2050 if (filename[0] != '/') {
2051 char tmp[UTIL_PATH_SIZE];
2052
2053 strscpy(tmp, sizeof(tmp), filename);
2054 strscpyl(filename, sizeof(filename),
2055 udev_device_get_syspath(event->dev), "/", tmp, NULL);
2056 }
2057 }
2058 attr_subst_subdir(filename, sizeof(filename));
2059
2060 match = (stat(filename, &statbuf) == 0);
2061 if (match && cur->key.mode > 0)
2062 match = ((statbuf.st_mode & cur->key.mode) > 0);
2063 if (match && cur->key.op == OP_NOMATCH)
2064 goto nomatch;
2065 if (!match && cur->key.op == OP_MATCH)
2066 goto nomatch;
2067 break;
2068 }
2069 case TK_M_PROGRAM: {
2070 char program[UTIL_PATH_SIZE];
2071 char result[UTIL_LINE_SIZE];
2072
2073 event->program_result = mfree(event->program_result);
2074 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), program, sizeof(program));
2075 log_debug("PROGRAM '%s' %s:%u",
2076 program,
2077 rules_str(rules, rule->rule.filename_off),
2078 rule->rule.filename_line);
2079
2080 if (udev_event_spawn(event, timeout_usec, timeout_warn_usec, true, program, result, sizeof(result)) < 0) {
2081 if (cur->key.op != OP_NOMATCH)
2082 goto nomatch;
2083 } else {
2084 int count;
2085
2086 util_remove_trailing_chars(result, '\n');
2087 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2088 count = util_replace_chars(result, UDEV_ALLOWED_CHARS_INPUT);
2089 if (count > 0)
2090 log_debug("%i character(s) replaced" , count);
2091 }
2092 event->program_result = strdup(result);
2093 if (cur->key.op == OP_NOMATCH)
2094 goto nomatch;
2095 }
2096 break;
2097 }
2098 case TK_M_IMPORT_FILE: {
2099 char import[UTIL_PATH_SIZE];
2100
2101 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), import, sizeof(import));
2102 if (import_file_into_properties(event->dev, import) != 0)
2103 if (cur->key.op != OP_NOMATCH)
2104 goto nomatch;
2105 break;
2106 }
2107 case TK_M_IMPORT_PROG: {
2108 char import[UTIL_PATH_SIZE];
2109
2110 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), import, sizeof(import));
2111 log_debug("IMPORT '%s' %s:%u",
2112 import,
2113 rules_str(rules, rule->rule.filename_off),
2114 rule->rule.filename_line);
2115
2116 if (import_program_into_properties(event, timeout_usec, timeout_warn_usec, import) != 0)
2117 if (cur->key.op != OP_NOMATCH)
2118 goto nomatch;
2119 break;
2120 }
2121 case TK_M_IMPORT_BUILTIN: {
2122 char command[UTIL_PATH_SIZE];
2123
2124 if (udev_builtin_run_once(cur->key.builtin_cmd)) {
2125 /* check if we ran already */
2126 if (event->builtin_run & (1 << cur->key.builtin_cmd)) {
2127 log_debug("IMPORT builtin skip '%s' %s:%u",
2128 udev_builtin_name(cur->key.builtin_cmd),
2129 rules_str(rules, rule->rule.filename_off),
2130 rule->rule.filename_line);
2131 /* return the result from earlier run */
2132 if (event->builtin_ret & (1 << cur->key.builtin_cmd))
2133 if (cur->key.op != OP_NOMATCH)
2134 goto nomatch;
2135 break;
2136 }
2137 /* mark as ran */
2138 event->builtin_run |= (1 << cur->key.builtin_cmd);
2139 }
2140
2141 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), command, sizeof(command));
2142 log_debug("IMPORT builtin '%s' %s:%u",
2143 udev_builtin_name(cur->key.builtin_cmd),
2144 rules_str(rules, rule->rule.filename_off),
2145 rule->rule.filename_line);
2146
2147 if (udev_builtin_run(event->dev, cur->key.builtin_cmd, command, false) != 0) {
2148 /* remember failure */
2149 log_debug("IMPORT builtin '%s' returned non-zero",
2150 udev_builtin_name(cur->key.builtin_cmd));
2151 event->builtin_ret |= (1 << cur->key.builtin_cmd);
2152 if (cur->key.op != OP_NOMATCH)
2153 goto nomatch;
2154 }
2155 break;
2156 }
2157 case TK_M_IMPORT_DB: {
2158 const char *key = rules_str(rules, cur->key.value_off);
2159 const char *value;
2160
2161 value = udev_device_get_property_value(event->dev_db, key);
2162 if (value != NULL)
2163 udev_device_add_property(event->dev, key, value);
2164 else {
2165 if (cur->key.op != OP_NOMATCH)
2166 goto nomatch;
2167 }
2168 break;
2169 }
2170 case TK_M_IMPORT_CMDLINE: {
2171 FILE *f;
2172 bool imported = false;
2173
2174 f = fopen("/proc/cmdline", "re");
2175 if (f != NULL) {
2176 char cmdline[4096];
2177
2178 if (fgets(cmdline, sizeof(cmdline), f) != NULL) {
2179 const char *key = rules_str(rules, cur->key.value_off);
2180 char *pos;
2181
2182 pos = strstr(cmdline, key);
2183 if (pos != NULL) {
2184 pos += strlen(key);
2185 if (pos[0] == '\0' || isspace(pos[0])) {
2186 /* we import simple flags as 'FLAG=1' */
2187 udev_device_add_property(event->dev, key, "1");
2188 imported = true;
2189 } else if (pos[0] == '=') {
2190 const char *value;
2191
2192 pos++;
2193 value = pos;
2194 while (pos[0] != '\0' && !isspace(pos[0]))
2195 pos++;
2196 pos[0] = '\0';
2197 udev_device_add_property(event->dev, key, value);
2198 imported = true;
2199 }
2200 }
2201 }
2202 fclose(f);
2203 }
2204 if (!imported && cur->key.op != OP_NOMATCH)
2205 goto nomatch;
2206 break;
2207 }
2208 case TK_M_IMPORT_PARENT: {
2209 char import[UTIL_PATH_SIZE];
2210
2211 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), import, sizeof(import));
2212 if (import_parent_into_properties(event->dev, import) != 0)
2213 if (cur->key.op != OP_NOMATCH)
2214 goto nomatch;
2215 break;
2216 }
2217 case TK_M_RESULT:
2218 if (match_key(rules, cur, event->program_result) != 0)
2219 goto nomatch;
2220 break;
2221 case TK_A_STRING_ESCAPE_NONE:
2222 esc = ESCAPE_NONE;
2223 break;
2224 case TK_A_STRING_ESCAPE_REPLACE:
2225 esc = ESCAPE_REPLACE;
2226 break;
2227 case TK_A_DB_PERSIST:
2228 udev_device_set_db_persist(event->dev);
2229 break;
2230 case TK_A_INOTIFY_WATCH:
2231 if (event->inotify_watch_final)
2232 break;
2233 if (cur->key.op == OP_ASSIGN_FINAL)
2234 event->inotify_watch_final = true;
2235 event->inotify_watch = cur->key.watch;
2236 break;
2237 case TK_A_DEVLINK_PRIO:
2238 udev_device_set_devlink_priority(event->dev, cur->key.devlink_prio);
2239 break;
2240 case TK_A_OWNER: {
2241 char owner[UTIL_NAME_SIZE];
2242 const char *ow = owner;
2243 int r;
2244
2245 if (event->owner_final)
2246 break;
2247 if (cur->key.op == OP_ASSIGN_FINAL)
2248 event->owner_final = true;
2249 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), owner, sizeof(owner));
2250 event->owner_set = true;
2251 r = get_user_creds(&ow, &event->uid, NULL, NULL, NULL);
2252 if (r < 0) {
2253 if (r == -ENOENT || r == -ESRCH)
2254 log_error("specified user '%s' unknown", owner);
2255 else
2256 log_error_errno(r, "error resolving user '%s': %m", owner);
2257
2258 event->uid = 0;
2259 }
2260 log_debug("OWNER %u %s:%u",
2261 event->uid,
2262 rules_str(rules, rule->rule.filename_off),
2263 rule->rule.filename_line);
2264 break;
2265 }
2266 case TK_A_GROUP: {
2267 char group[UTIL_NAME_SIZE];
2268 const char *gr = group;
2269 int r;
2270
2271 if (event->group_final)
2272 break;
2273 if (cur->key.op == OP_ASSIGN_FINAL)
2274 event->group_final = true;
2275 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), group, sizeof(group));
2276 event->group_set = true;
2277 r = get_group_creds(&gr, &event->gid);
2278 if (r < 0) {
2279 if (r == -ENOENT || r == -ESRCH)
2280 log_error("specified group '%s' unknown", group);
2281 else
2282 log_error_errno(r, "error resolving group '%s': %m", group);
2283
2284 event->gid = 0;
2285 }
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 }
2292 case TK_A_MODE: {
2293 char mode_str[UTIL_NAME_SIZE];
2294 mode_t mode;
2295 char *endptr;
2296
2297 if (event->mode_final)
2298 break;
2299 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), mode_str, sizeof(mode_str));
2300 mode = strtol(mode_str, &endptr, 8);
2301 if (endptr[0] != '\0') {
2302 log_error("ignoring invalid mode '%s'", mode_str);
2303 break;
2304 }
2305 if (cur->key.op == OP_ASSIGN_FINAL)
2306 event->mode_final = true;
2307 event->mode_set = true;
2308 event->mode = mode;
2309 log_debug("MODE %#o %s:%u",
2310 event->mode,
2311 rules_str(rules, rule->rule.filename_off),
2312 rule->rule.filename_line);
2313 break;
2314 }
2315 case TK_A_OWNER_ID:
2316 if (event->owner_final)
2317 break;
2318 if (cur->key.op == OP_ASSIGN_FINAL)
2319 event->owner_final = true;
2320 event->owner_set = true;
2321 event->uid = cur->key.uid;
2322 log_debug("OWNER %u %s:%u",
2323 event->uid,
2324 rules_str(rules, rule->rule.filename_off),
2325 rule->rule.filename_line);
2326 break;
2327 case TK_A_GROUP_ID:
2328 if (event->group_final)
2329 break;
2330 if (cur->key.op == OP_ASSIGN_FINAL)
2331 event->group_final = true;
2332 event->group_set = true;
2333 event->gid = cur->key.gid;
2334 log_debug("GROUP %u %s:%u",
2335 event->gid,
2336 rules_str(rules, rule->rule.filename_off),
2337 rule->rule.filename_line);
2338 break;
2339 case TK_A_MODE_ID:
2340 if (event->mode_final)
2341 break;
2342 if (cur->key.op == OP_ASSIGN_FINAL)
2343 event->mode_final = true;
2344 event->mode_set = true;
2345 event->mode = cur->key.mode;
2346 log_debug("MODE %#o %s:%u",
2347 event->mode,
2348 rules_str(rules, rule->rule.filename_off),
2349 rule->rule.filename_line);
2350 break;
2351 case TK_A_SECLABEL: {
2352 const char *name, *label;
2353
2354 name = rules_str(rules, cur->key.attr_off);
2355 label = rules_str(rules, cur->key.value_off);
2356 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2357 udev_list_cleanup(&event->seclabel_list);
2358 udev_list_entry_add(&event->seclabel_list, name, label);
2359 log_debug("SECLABEL{%s}='%s' %s:%u",
2360 name, label,
2361 rules_str(rules, rule->rule.filename_off),
2362 rule->rule.filename_line);
2363 break;
2364 }
2365 case TK_A_ENV: {
2366 const char *name = rules_str(rules, cur->key.attr_off);
2367 char *value = rules_str(rules, cur->key.value_off);
2368 char value_new[UTIL_NAME_SIZE];
2369 const char *value_old = NULL;
2370
2371 if (value[0] == '\0') {
2372 if (cur->key.op == OP_ADD)
2373 break;
2374 udev_device_add_property(event->dev, name, NULL);
2375 break;
2376 }
2377
2378 if (cur->key.op == OP_ADD)
2379 value_old = udev_device_get_property_value(event->dev, name);
2380 if (value_old) {
2381 char temp[UTIL_NAME_SIZE];
2382
2383 /* append value separated by space */
2384 udev_event_apply_format(event, value, temp, sizeof(temp));
2385 strscpyl(value_new, sizeof(value_new), value_old, " ", temp, NULL);
2386 } else
2387 udev_event_apply_format(event, value, value_new, sizeof(value_new));
2388
2389 udev_device_add_property(event->dev, name, value_new);
2390 break;
2391 }
2392 case TK_A_TAG: {
2393 char tag[UTIL_PATH_SIZE];
2394 const char *p;
2395
2396 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), tag, sizeof(tag));
2397 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2398 udev_device_cleanup_tags_list(event->dev);
2399 for (p = tag; *p != '\0'; p++) {
2400 if ((*p >= 'a' && *p <= 'z') ||
2401 (*p >= 'A' && *p <= 'Z') ||
2402 (*p >= '0' && *p <= '9') ||
2403 *p == '-' || *p == '_')
2404 continue;
2405 log_error("ignoring invalid tag name '%s'", tag);
2406 break;
2407 }
2408 if (cur->key.op == OP_REMOVE)
2409 udev_device_remove_tag(event->dev, tag);
2410 else
2411 udev_device_add_tag(event->dev, tag);
2412 break;
2413 }
2414 case TK_A_NAME: {
2415 const char *name = rules_str(rules, cur->key.value_off);
2416
2417 char name_str[UTIL_PATH_SIZE];
2418 int count;
2419
2420 if (event->name_final)
2421 break;
2422 if (cur->key.op == OP_ASSIGN_FINAL)
2423 event->name_final = true;
2424 udev_event_apply_format(event, name, name_str, sizeof(name_str));
2425 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2426 count = util_replace_chars(name_str, "/");
2427 if (count > 0)
2428 log_debug("%i character(s) replaced", count);
2429 }
2430 if (major(udev_device_get_devnum(event->dev)) &&
2431 (!streq(name_str, udev_device_get_devnode(event->dev) + strlen("/dev/")))) {
2432 log_error("NAME=\"%s\" ignored, kernel device nodes "
2433 "can not be renamed; please fix it in %s:%u\n", name,
2434 rules_str(rules, rule->rule.filename_off), rule->rule.filename_line);
2435 break;
2436 }
2437 free_and_strdup(&event->name, name_str);
2438 log_debug("NAME '%s' %s:%u",
2439 event->name,
2440 rules_str(rules, rule->rule.filename_off),
2441 rule->rule.filename_line);
2442 break;
2443 }
2444 case TK_A_DEVLINK: {
2445 char temp[UTIL_PATH_SIZE];
2446 char filename[UTIL_PATH_SIZE];
2447 char *pos, *next;
2448 int count = 0;
2449
2450 if (event->devlink_final)
2451 break;
2452 if (major(udev_device_get_devnum(event->dev)) == 0)
2453 break;
2454 if (cur->key.op == OP_ASSIGN_FINAL)
2455 event->devlink_final = true;
2456 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2457 udev_device_cleanup_devlinks_list(event->dev);
2458
2459 /* allow multiple symlinks separated by spaces */
2460 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), temp, sizeof(temp));
2461 if (esc == ESCAPE_UNSET)
2462 count = util_replace_chars(temp, "/ ");
2463 else if (esc == ESCAPE_REPLACE)
2464 count = util_replace_chars(temp, "/");
2465 if (count > 0)
2466 log_debug("%i character(s) replaced" , count);
2467 pos = temp;
2468 while (isspace(pos[0]))
2469 pos++;
2470 next = strchr(pos, ' ');
2471 while (next != NULL) {
2472 next[0] = '\0';
2473 log_debug("LINK '%s' %s:%u", pos,
2474 rules_str(rules, rule->rule.filename_off), rule->rule.filename_line);
2475 strscpyl(filename, sizeof(filename), "/dev/", pos, NULL);
2476 udev_device_add_devlink(event->dev, filename);
2477 while (isspace(next[1]))
2478 next++;
2479 pos = &next[1];
2480 next = strchr(pos, ' ');
2481 }
2482 if (pos[0] != '\0') {
2483 log_debug("LINK '%s' %s:%u", pos,
2484 rules_str(rules, rule->rule.filename_off), rule->rule.filename_line);
2485 strscpyl(filename, sizeof(filename), "/dev/", pos, NULL);
2486 udev_device_add_devlink(event->dev, filename);
2487 }
2488 break;
2489 }
2490 case TK_A_ATTR: {
2491 const char *key_name = rules_str(rules, cur->key.attr_off);
2492 char attr[UTIL_PATH_SIZE];
2493 char value[UTIL_NAME_SIZE];
2494 FILE *f;
2495
2496 if (util_resolve_subsys_kernel(event->udev, key_name, attr, sizeof(attr), 0) != 0)
2497 strscpyl(attr, sizeof(attr), udev_device_get_syspath(event->dev), "/", key_name, NULL);
2498 attr_subst_subdir(attr, sizeof(attr));
2499
2500 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), value, sizeof(value));
2501 log_debug("ATTR '%s' writing '%s' %s:%u", attr, value,
2502 rules_str(rules, rule->rule.filename_off),
2503 rule->rule.filename_line);
2504 f = fopen(attr, "we");
2505 if (f != NULL) {
2506 if (fprintf(f, "%s", value) <= 0)
2507 log_error_errno(errno, "error writing ATTR{%s}: %m", attr);
2508 fclose(f);
2509 } else {
2510 log_error_errno(errno, "error opening ATTR{%s} for writing: %m", attr);
2511 }
2512 break;
2513 }
2514 case TK_A_SYSCTL: {
2515 char filename[UTIL_PATH_SIZE];
2516 char value[UTIL_NAME_SIZE];
2517 int r;
2518
2519 udev_event_apply_format(event, rules_str(rules, cur->key.attr_off), filename, sizeof(filename));
2520 sysctl_normalize(filename);
2521 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), value, sizeof(value));
2522 log_debug("SYSCTL '%s' writing '%s' %s:%u", filename, value,
2523 rules_str(rules, rule->rule.filename_off), rule->rule.filename_line);
2524 r = sysctl_write(filename, value);
2525 if (r < 0)
2526 log_error_errno(r, "error writing SYSCTL{%s}='%s': %m", filename, value);
2527 break;
2528 }
2529 case TK_A_RUN_BUILTIN:
2530 case TK_A_RUN_PROGRAM: {
2531 struct udev_list_entry *entry;
2532
2533 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2534 udev_list_cleanup(&event->run_list);
2535 log_debug("RUN '%s' %s:%u",
2536 rules_str(rules, cur->key.value_off),
2537 rules_str(rules, rule->rule.filename_off),
2538 rule->rule.filename_line);
2539 entry = udev_list_entry_add(&event->run_list, rules_str(rules, cur->key.value_off), NULL);
2540 udev_list_entry_set_num(entry, cur->key.builtin_cmd);
2541 break;
2542 }
2543 case TK_A_GOTO:
2544 if (cur->key.rule_goto == 0)
2545 break;
2546 cur = &rules->tokens[cur->key.rule_goto];
2547 continue;
2548 case TK_END:
2549 return 0;
2550
2551 case TK_M_PARENTS_MIN:
2552 case TK_M_PARENTS_MAX:
2553 case TK_M_MAX:
2554 case TK_UNSET:
2555 log_error("wrong type %u", cur->type);
2556 goto nomatch;
2557 }
2558
2559 cur++;
2560 continue;
2561 nomatch:
2562 /* fast-forward to next rule */
2563 cur = rule + rule->rule.token_count;
2564 }
2565 }
2566
2567 int udev_rules_apply_static_dev_perms(struct udev_rules *rules) {
2568 struct token *cur;
2569 struct token *rule;
2570 uid_t uid = 0;
2571 gid_t gid = 0;
2572 mode_t mode = 0;
2573 _cleanup_strv_free_ char **tags = NULL;
2574 char **t;
2575 FILE *f = NULL;
2576 _cleanup_free_ char *path = NULL;
2577 int r = 0;
2578
2579 if (rules->tokens == NULL)
2580 return 0;
2581
2582 cur = &rules->tokens[0];
2583 rule = cur;
2584 for (;;) {
2585 switch (cur->type) {
2586 case TK_RULE:
2587 /* current rule */
2588 rule = cur;
2589
2590 /* skip rules without a static_node tag */
2591 if (!rule->rule.has_static_node)
2592 goto next;
2593
2594 uid = 0;
2595 gid = 0;
2596 mode = 0;
2597 tags = strv_free(tags);
2598 break;
2599 case TK_A_OWNER_ID:
2600 uid = cur->key.uid;
2601 break;
2602 case TK_A_GROUP_ID:
2603 gid = cur->key.gid;
2604 break;
2605 case TK_A_MODE_ID:
2606 mode = cur->key.mode;
2607 break;
2608 case TK_A_TAG:
2609 r = strv_extend(&tags, rules_str(rules, cur->key.value_off));
2610 if (r < 0)
2611 goto finish;
2612
2613 break;
2614 case TK_A_STATIC_NODE: {
2615 char device_node[UTIL_PATH_SIZE];
2616 char tags_dir[UTIL_PATH_SIZE];
2617 char tag_symlink[UTIL_PATH_SIZE];
2618 struct stat stats;
2619
2620 /* we assure, that the permissions tokens are sorted before the static token */
2621
2622 if (mode == 0 && uid == 0 && gid == 0 && tags == NULL)
2623 goto next;
2624
2625 strscpyl(device_node, sizeof(device_node), "/dev/", rules_str(rules, cur->key.value_off), NULL);
2626 if (stat(device_node, &stats) != 0)
2627 break;
2628 if (!S_ISBLK(stats.st_mode) && !S_ISCHR(stats.st_mode))
2629 break;
2630
2631 /* export the tags to a directory as symlinks, allowing otherwise dead nodes to be tagged */
2632 if (tags) {
2633 STRV_FOREACH(t, tags) {
2634 _cleanup_free_ char *unescaped_filename = NULL;
2635
2636 strscpyl(tags_dir, sizeof(tags_dir), "/run/udev/static_node-tags/", *t, "/", NULL);
2637 r = mkdir_p(tags_dir, 0755);
2638 if (r < 0)
2639 return log_error_errno(r, "failed to create %s: %m", tags_dir);
2640
2641 unescaped_filename = xescape(rules_str(rules, cur->key.value_off), "/.");
2642
2643 strscpyl(tag_symlink, sizeof(tag_symlink), tags_dir, unescaped_filename, NULL);
2644 r = symlink(device_node, tag_symlink);
2645 if (r < 0 && errno != EEXIST)
2646 return log_error_errno(errno, "failed to create symlink %s -> %s: %m",
2647 tag_symlink, device_node);
2648 else
2649 r = 0;
2650 }
2651 }
2652
2653 /* don't touch the permissions if only the tags were set */
2654 if (mode == 0 && uid == 0 && gid == 0)
2655 break;
2656
2657 if (mode == 0) {
2658 if (gid > 0)
2659 mode = 0660;
2660 else
2661 mode = 0600;
2662 }
2663 if (mode != (stats.st_mode & 01777)) {
2664 r = chmod(device_node, mode);
2665 if (r < 0) {
2666 log_error("failed to chmod '%s' %#o", device_node, mode);
2667 return -errno;
2668 } else
2669 log_debug("chmod '%s' %#o", device_node, mode);
2670 }
2671
2672 if ((uid != 0 && uid != stats.st_uid) || (gid != 0 && gid != stats.st_gid)) {
2673 r = chown(device_node, uid, gid);
2674 if (r < 0) {
2675 log_error("failed to chown '%s' %u %u ", device_node, uid, gid);
2676 return -errno;
2677 } else
2678 log_debug("chown '%s' %u %u", device_node, uid, gid);
2679 }
2680
2681 utimensat(AT_FDCWD, device_node, NULL, 0);
2682 break;
2683 }
2684 case TK_END:
2685 goto finish;
2686 }
2687
2688 cur++;
2689 continue;
2690 next:
2691 /* fast-forward to next rule */
2692 cur = rule + rule->rule.token_count;
2693 continue;
2694 }
2695
2696 finish:
2697 if (f) {
2698 fflush(f);
2699 fchmod(fileno(f), 0644);
2700 if (ferror(f) || rename(path, "/run/udev/static_node-tags") < 0) {
2701 r = -errno;
2702 unlink("/run/udev/static_node-tags");
2703 unlink(path);
2704 }
2705 fclose(f);
2706 }
2707
2708 return r;
2709 }
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