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[thirdparty/systemd.git] / src / udev / udev-rules.c
1 /*
2 * Copyright (C) 2003-2012 Kay Sievers <kay@vrfy.org>
3 *
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
16 */
17
18 #include <stddef.h>
19 #include <limits.h>
20 #include <stdlib.h>
21 #include <stdbool.h>
22 #include <string.h>
23 #include <stdio.h>
24 #include <fcntl.h>
25 #include <ctype.h>
26 #include <unistd.h>
27 #include <errno.h>
28 #include <dirent.h>
29 #include <fnmatch.h>
30 #include <time.h>
31
32 #include "udev.h"
33 #include "path-util.h"
34 #include "conf-files.h"
35 #include "strbuf.h"
36 #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 void dump_token(struct udev_rules *rules, struct token *token) {}
444 static inline void dump_rules(struct udev_rules *rules) {}
445 #endif /* DEBUG */
446
447 static int add_token(struct udev_rules *rules, struct token *token)
448 {
449 /* grow buffer if needed */
450 if (rules->token_cur+1 >= rules->token_max) {
451 struct token *tokens;
452 unsigned int add;
453
454 /* double the buffer size */
455 add = rules->token_max;
456 if (add < 8)
457 add = 8;
458
459 tokens = realloc(rules->tokens, (rules->token_max + add ) * sizeof(struct token));
460 if (tokens == NULL)
461 return -1;
462 rules->tokens = tokens;
463 rules->token_max += add;
464 }
465 memcpy(&rules->tokens[rules->token_cur], token, sizeof(struct token));
466 rules->token_cur++;
467 return 0;
468 }
469
470 static uid_t add_uid(struct udev_rules *rules, const char *owner)
471 {
472 unsigned int i;
473 uid_t uid;
474 unsigned int off;
475
476 /* lookup, if we know it already */
477 for (i = 0; i < rules->uids_cur; i++) {
478 off = rules->uids[i].name_off;
479 if (streq(rules_str(rules, off), owner)) {
480 uid = rules->uids[i].uid;
481 return uid;
482 }
483 }
484 uid = util_lookup_user(rules->udev, owner);
485
486 /* grow buffer if needed */
487 if (rules->uids_cur+1 >= rules->uids_max) {
488 struct uid_gid *uids;
489 unsigned int add;
490
491 /* double the buffer size */
492 add = rules->uids_max;
493 if (add < 1)
494 add = 8;
495
496 uids = realloc(rules->uids, (rules->uids_max + add ) * sizeof(struct uid_gid));
497 if (uids == NULL)
498 return uid;
499 rules->uids = uids;
500 rules->uids_max += add;
501 }
502 rules->uids[rules->uids_cur].uid = uid;
503 off = rules_add_string(rules, owner);
504 if (off <= 0)
505 return uid;
506 rules->uids[rules->uids_cur].name_off = off;
507 rules->uids_cur++;
508 return uid;
509 }
510
511 static gid_t add_gid(struct udev_rules *rules, const char *group)
512 {
513 unsigned int i;
514 gid_t gid;
515 unsigned int off;
516
517 /* lookup, if we know it already */
518 for (i = 0; i < rules->gids_cur; i++) {
519 off = rules->gids[i].name_off;
520 if (streq(rules_str(rules, off), group)) {
521 gid = rules->gids[i].gid;
522 return gid;
523 }
524 }
525 gid = util_lookup_group(rules->udev, group);
526
527 /* grow buffer if needed */
528 if (rules->gids_cur+1 >= rules->gids_max) {
529 struct uid_gid *gids;
530 unsigned int add;
531
532 /* double the buffer size */
533 add = rules->gids_max;
534 if (add < 1)
535 add = 8;
536
537 gids = realloc(rules->gids, (rules->gids_max + add ) * sizeof(struct uid_gid));
538 if (gids == NULL)
539 return gid;
540 rules->gids = gids;
541 rules->gids_max += add;
542 }
543 rules->gids[rules->gids_cur].gid = gid;
544 off = rules_add_string(rules, group);
545 if (off <= 0)
546 return gid;
547 rules->gids[rules->gids_cur].name_off = off;
548 rules->gids_cur++;
549 return gid;
550 }
551
552 static int import_property_from_string(struct udev_device *dev, char *line)
553 {
554 char *key;
555 char *val;
556 size_t len;
557 struct udev_list_entry *entry;
558
559 /* find key */
560 key = line;
561 while (isspace(key[0]))
562 key++;
563
564 /* comment or empty line */
565 if (key[0] == '#' || key[0] == '\0')
566 return -1;
567
568 /* split key/value */
569 val = strchr(key, '=');
570 if (val == NULL)
571 return -1;
572 val[0] = '\0';
573 val++;
574
575 /* find value */
576 while (isspace(val[0]))
577 val++;
578
579 /* terminate key */
580 len = strlen(key);
581 if (len == 0)
582 return -1;
583 while (isspace(key[len-1]))
584 len--;
585 key[len] = '\0';
586
587 /* terminate value */
588 len = strlen(val);
589 if (len == 0)
590 return -1;
591 while (isspace(val[len-1]))
592 len--;
593 val[len] = '\0';
594
595 if (len == 0)
596 return -1;
597
598 /* unquote */
599 if (val[0] == '"' || val[0] == '\'') {
600 if (val[len-1] != val[0]) {
601 log_debug("inconsistent quoting: '%s', skip", line);
602 return -1;
603 }
604 val[len-1] = '\0';
605 val++;
606 }
607
608 entry = udev_device_add_property(dev, key, val);
609 /* store in db, skip private keys */
610 if (key[0] != '.')
611 udev_list_entry_set_num(entry, true);
612
613 return 0;
614 }
615
616 static int import_file_into_properties(struct udev_device *dev, const char *filename)
617 {
618 FILE *f;
619 char line[UTIL_LINE_SIZE];
620
621 f = fopen(filename, "re");
622 if (f == NULL)
623 return -1;
624 while (fgets(line, sizeof(line), f) != NULL)
625 import_property_from_string(dev, line);
626 fclose(f);
627 return 0;
628 }
629
630 static int import_program_into_properties(struct udev_event *event, const char *program, const sigset_t *sigmask)
631 {
632 struct udev_device *dev = event->dev;
633 char **envp;
634 char result[UTIL_LINE_SIZE];
635 char *line;
636 int err;
637
638 envp = udev_device_get_properties_envp(dev);
639 err = udev_event_spawn(event, program, envp, sigmask, result, sizeof(result));
640 if (err < 0)
641 return err;
642
643 line = result;
644 while (line != NULL) {
645 char *pos;
646
647 pos = strchr(line, '\n');
648 if (pos != NULL) {
649 pos[0] = '\0';
650 pos = &pos[1];
651 }
652 import_property_from_string(dev, line);
653 line = pos;
654 }
655 return 0;
656 }
657
658 static int import_parent_into_properties(struct udev_device *dev, const char *filter)
659 {
660 struct udev_device *dev_parent;
661 struct udev_list_entry *list_entry;
662
663 dev_parent = udev_device_get_parent(dev);
664 if (dev_parent == NULL)
665 return -1;
666
667 udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(dev_parent)) {
668 const char *key = udev_list_entry_get_name(list_entry);
669 const char *val = udev_list_entry_get_value(list_entry);
670
671 if (fnmatch(filter, key, 0) == 0) {
672 struct udev_list_entry *entry;
673
674 entry = udev_device_add_property(dev, key, val);
675 /* store in db, skip private keys */
676 if (key[0] != '.')
677 udev_list_entry_set_num(entry, true);
678 }
679 }
680 return 0;
681 }
682
683 #define WAIT_LOOP_PER_SECOND 50
684 static int wait_for_file(struct udev_device *dev, const char *file, int timeout)
685 {
686 char filepath[UTIL_PATH_SIZE];
687 char devicepath[UTIL_PATH_SIZE];
688 struct stat stats;
689 int loop = timeout * WAIT_LOOP_PER_SECOND;
690
691 /* a relative path is a device attribute */
692 devicepath[0] = '\0';
693 if (file[0] != '/') {
694 strscpyl(devicepath, sizeof(devicepath), udev_device_get_syspath(dev), NULL);
695 strscpyl(filepath, sizeof(filepath), devicepath, "/", file, NULL);
696 file = filepath;
697 }
698
699 while (--loop) {
700 const struct timespec duration = { 0, 1000 * 1000 * 1000 / WAIT_LOOP_PER_SECOND };
701
702 /* lookup file */
703 if (stat(file, &stats) == 0) {
704 log_debug("file '%s' appeared after %i loops", file, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
705 return 0;
706 }
707 /* make sure, the device did not disappear in the meantime */
708 if (devicepath[0] != '\0' && stat(devicepath, &stats) != 0) {
709 log_debug("device disappeared while waiting for '%s'", file);
710 return -2;
711 }
712 log_debug("wait for '%s' for %i mseconds", file, 1000 / WAIT_LOOP_PER_SECOND);
713 nanosleep(&duration, NULL);
714 }
715 log_debug("waiting for '%s' failed", file);
716 return -1;
717 }
718
719 static int attr_subst_subdir(char *attr, size_t len)
720 {
721 bool found = false;
722
723 if (strstr(attr, "/*/")) {
724 char *pos;
725 char dirname[UTIL_PATH_SIZE];
726 const char *tail;
727 DIR *dir;
728
729 strscpy(dirname, sizeof(dirname), attr);
730 pos = strstr(dirname, "/*/");
731 if (pos == NULL)
732 return -1;
733 pos[0] = '\0';
734 tail = &pos[2];
735 dir = opendir(dirname);
736 if (dir != NULL) {
737 struct dirent *dent;
738
739 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
740 struct stat stats;
741
742 if (dent->d_name[0] == '.')
743 continue;
744 strscpyl(attr, len, dirname, "/", dent->d_name, tail, NULL);
745 if (stat(attr, &stats) == 0) {
746 found = true;
747 break;
748 }
749 }
750 closedir(dir);
751 }
752 }
753
754 return found;
755 }
756
757 static int get_key(struct udev *udev, char **line, char **key, enum operation_type *op, char **value)
758 {
759 char *linepos;
760 char *temp;
761
762 linepos = *line;
763 if (linepos == NULL || linepos[0] == '\0')
764 return -1;
765
766 /* skip whitespace */
767 while (isspace(linepos[0]) || linepos[0] == ',')
768 linepos++;
769
770 /* get the key */
771 if (linepos[0] == '\0')
772 return -1;
773 *key = linepos;
774
775 for (;;) {
776 linepos++;
777 if (linepos[0] == '\0')
778 return -1;
779 if (isspace(linepos[0]))
780 break;
781 if (linepos[0] == '=')
782 break;
783 if ((linepos[0] == '+') || (linepos[0] == '!') || (linepos[0] == ':'))
784 if (linepos[1] == '=')
785 break;
786 }
787
788 /* remember end of key */
789 temp = linepos;
790
791 /* skip whitespace after key */
792 while (isspace(linepos[0]))
793 linepos++;
794 if (linepos[0] == '\0')
795 return -1;
796
797 /* get operation type */
798 if (linepos[0] == '=' && linepos[1] == '=') {
799 *op = OP_MATCH;
800 linepos += 2;
801 } else if (linepos[0] == '!' && linepos[1] == '=') {
802 *op = OP_NOMATCH;
803 linepos += 2;
804 } else if (linepos[0] == '+' && linepos[1] == '=') {
805 *op = OP_ADD;
806 linepos += 2;
807 } else if (linepos[0] == '=') {
808 *op = OP_ASSIGN;
809 linepos++;
810 } else if (linepos[0] == ':' && linepos[1] == '=') {
811 *op = OP_ASSIGN_FINAL;
812 linepos += 2;
813 } else
814 return -1;
815
816 /* terminate key */
817 temp[0] = '\0';
818
819 /* skip whitespace after operator */
820 while (isspace(linepos[0]))
821 linepos++;
822 if (linepos[0] == '\0')
823 return -1;
824
825 /* get the value */
826 if (linepos[0] == '"')
827 linepos++;
828 else
829 return -1;
830 *value = linepos;
831
832 /* terminate */
833 temp = strchr(linepos, '"');
834 if (!temp)
835 return -1;
836 temp[0] = '\0';
837 temp++;
838
839 /* move line to next key */
840 *line = temp;
841 return 0;
842 }
843
844 /* extract possible KEY{attr} */
845 static const char *get_key_attribute(struct udev *udev, char *str)
846 {
847 char *pos;
848 char *attr;
849
850 attr = strchr(str, '{');
851 if (attr != NULL) {
852 attr++;
853 pos = strchr(attr, '}');
854 if (pos == NULL) {
855 log_error("missing closing brace for format");
856 return NULL;
857 }
858 pos[0] = '\0';
859 return attr;
860 }
861 return NULL;
862 }
863
864 static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
865 enum operation_type op,
866 const char *value, const void *data)
867 {
868 struct token *token = &rule_tmp->token[rule_tmp->token_cur];
869 const char *attr = NULL;
870
871 memzero(token, sizeof(struct token));
872
873 switch (type) {
874 case TK_M_ACTION:
875 case TK_M_DEVPATH:
876 case TK_M_KERNEL:
877 case TK_M_SUBSYSTEM:
878 case TK_M_DRIVER:
879 case TK_M_WAITFOR:
880 case TK_M_DEVLINK:
881 case TK_M_NAME:
882 case TK_M_KERNELS:
883 case TK_M_SUBSYSTEMS:
884 case TK_M_DRIVERS:
885 case TK_M_TAGS:
886 case TK_M_PROGRAM:
887 case TK_M_IMPORT_FILE:
888 case TK_M_IMPORT_PROG:
889 case TK_M_IMPORT_DB:
890 case TK_M_IMPORT_CMDLINE:
891 case TK_M_IMPORT_PARENT:
892 case TK_M_RESULT:
893 case TK_A_OWNER:
894 case TK_A_GROUP:
895 case TK_A_MODE:
896 case TK_A_DEVLINK:
897 case TK_A_NAME:
898 case TK_A_GOTO:
899 case TK_M_TAG:
900 case TK_A_TAG:
901 case TK_A_STATIC_NODE:
902 token->key.value_off = rules_add_string(rule_tmp->rules, value);
903 break;
904 case TK_M_IMPORT_BUILTIN:
905 token->key.value_off = rules_add_string(rule_tmp->rules, value);
906 token->key.builtin_cmd = *(enum udev_builtin_cmd *)data;
907 break;
908 case TK_M_ENV:
909 case TK_M_ATTR:
910 case TK_M_ATTRS:
911 case TK_A_ATTR:
912 case TK_A_ENV:
913 case TK_A_SECLABEL:
914 attr = data;
915 token->key.value_off = rules_add_string(rule_tmp->rules, value);
916 token->key.attr_off = rules_add_string(rule_tmp->rules, attr);
917 break;
918 case TK_M_TEST:
919 token->key.value_off = rules_add_string(rule_tmp->rules, value);
920 if (data != NULL)
921 token->key.mode = *(mode_t *)data;
922 break;
923 case TK_A_STRING_ESCAPE_NONE:
924 case TK_A_STRING_ESCAPE_REPLACE:
925 case TK_A_DB_PERSIST:
926 break;
927 case TK_A_RUN_BUILTIN:
928 case TK_A_RUN_PROGRAM:
929 token->key.builtin_cmd = *(enum udev_builtin_cmd *)data;
930 token->key.value_off = rules_add_string(rule_tmp->rules, value);
931 break;
932 case TK_A_INOTIFY_WATCH:
933 case TK_A_DEVLINK_PRIO:
934 token->key.devlink_prio = *(int *)data;
935 break;
936 case TK_A_OWNER_ID:
937 token->key.uid = *(uid_t *)data;
938 break;
939 case TK_A_GROUP_ID:
940 token->key.gid = *(gid_t *)data;
941 break;
942 case TK_A_MODE_ID:
943 token->key.mode = *(mode_t *)data;
944 break;
945 case TK_M_EVENT_TIMEOUT:
946 token->key.event_timeout = *(int *)data;
947 break;
948 case TK_RULE:
949 case TK_M_PARENTS_MIN:
950 case TK_M_PARENTS_MAX:
951 case TK_M_MAX:
952 case TK_END:
953 case TK_UNSET:
954 log_error("wrong type %u", type);
955 return -1;
956 }
957
958 if (value != NULL && type < TK_M_MAX) {
959 /* check if we need to split or call fnmatch() while matching rules */
960 enum string_glob_type glob;
961 int has_split;
962 int has_glob;
963
964 has_split = (strchr(value, '|') != NULL);
965 has_glob = string_is_glob(value);
966 if (has_split && has_glob) {
967 glob = GL_SPLIT_GLOB;
968 } else if (has_split) {
969 glob = GL_SPLIT;
970 } else if (has_glob) {
971 if (streq(value, "?*"))
972 glob = GL_SOMETHING;
973 else
974 glob = GL_GLOB;
975 } else {
976 glob = GL_PLAIN;
977 }
978 token->key.glob = glob;
979 }
980
981 if (value != NULL && type > TK_M_MAX) {
982 /* check if assigned value has substitution chars */
983 if (value[0] == '[')
984 token->key.subst = SB_SUBSYS;
985 else if (strchr(value, '%') != NULL || strchr(value, '$') != NULL)
986 token->key.subst = SB_FORMAT;
987 else
988 token->key.subst = SB_NONE;
989 }
990
991 if (attr != NULL) {
992 /* check if property/attribute name has substitution chars */
993 if (attr[0] == '[')
994 token->key.attrsubst = SB_SUBSYS;
995 else if (strchr(attr, '%') != NULL || strchr(attr, '$') != NULL)
996 token->key.attrsubst = SB_FORMAT;
997 else
998 token->key.attrsubst = SB_NONE;
999 }
1000
1001 token->key.type = type;
1002 token->key.op = op;
1003 rule_tmp->token_cur++;
1004 if (rule_tmp->token_cur >= ELEMENTSOF(rule_tmp->token)) {
1005 log_error("temporary rule array too small");
1006 return -1;
1007 }
1008 return 0;
1009 }
1010
1011 static int sort_token(struct udev_rules *rules, struct rule_tmp *rule_tmp)
1012 {
1013 unsigned int i;
1014 unsigned int start = 0;
1015 unsigned int end = rule_tmp->token_cur;
1016
1017 for (i = 0; i < rule_tmp->token_cur; i++) {
1018 enum token_type next_val = TK_UNSET;
1019 unsigned int next_idx = 0;
1020 unsigned int j;
1021
1022 /* find smallest value */
1023 for (j = start; j < end; j++) {
1024 if (rule_tmp->token[j].type == TK_UNSET)
1025 continue;
1026 if (next_val == TK_UNSET || rule_tmp->token[j].type < next_val) {
1027 next_val = rule_tmp->token[j].type;
1028 next_idx = j;
1029 }
1030 }
1031
1032 /* add token and mark done */
1033 if (add_token(rules, &rule_tmp->token[next_idx]) != 0)
1034 return -1;
1035 rule_tmp->token[next_idx].type = TK_UNSET;
1036
1037 /* shrink range */
1038 if (next_idx == start)
1039 start++;
1040 if (next_idx+1 == end)
1041 end--;
1042 }
1043 return 0;
1044 }
1045
1046 static int add_rule(struct udev_rules *rules, char *line,
1047 const char *filename, unsigned int filename_off, unsigned int lineno)
1048 {
1049 char *linepos;
1050 const char *attr;
1051 struct rule_tmp rule_tmp;
1052
1053 memzero(&rule_tmp, sizeof(struct rule_tmp));
1054 rule_tmp.rules = rules;
1055 rule_tmp.rule.type = TK_RULE;
1056 /* the offset in the rule is limited to unsigned short */
1057 if (filename_off < USHRT_MAX)
1058 rule_tmp.rule.rule.filename_off = filename_off;
1059 rule_tmp.rule.rule.filename_line = lineno;
1060
1061 linepos = line;
1062 for (;;) {
1063 char *key;
1064 char *value;
1065 enum operation_type op;
1066
1067 if (get_key(rules->udev, &linepos, &key, &op, &value) != 0) {
1068 /* Avoid erroring on trailing whitespace. This is probably rare
1069 * so save the work for the error case instead of always trying
1070 * to strip the trailing whitespace with strstrip(). */
1071 while (isblank(*linepos))
1072 linepos++;
1073
1074 /* If we aren't at the end of the line, this is a parsing error.
1075 * Make a best effort to describe where the problem is. */
1076 if (*linepos != '\n') {
1077 char buf[2] = {linepos[1]};
1078 _cleanup_free_ char *tmp;
1079
1080 tmp = cescape(buf);
1081 log_error("invalid key/value pair in file %s on line %u,"
1082 "starting at character %tu ('%s')\n",
1083 filename, lineno, linepos - line + 1, tmp);
1084 if (linepos[1] == '#')
1085 log_error("hint: comments can only start at beginning of line");
1086 }
1087 break;
1088 }
1089
1090 if (streq(key, "ACTION")) {
1091 if (op > OP_MATCH_MAX) {
1092 log_error("invalid ACTION operation");
1093 goto invalid;
1094 }
1095 rule_add_key(&rule_tmp, TK_M_ACTION, op, value, NULL);
1096 continue;
1097 }
1098
1099 if (streq(key, "DEVPATH")) {
1100 if (op > OP_MATCH_MAX) {
1101 log_error("invalid DEVPATH operation");
1102 goto invalid;
1103 }
1104 rule_add_key(&rule_tmp, TK_M_DEVPATH, op, value, NULL);
1105 continue;
1106 }
1107
1108 if (streq(key, "KERNEL")) {
1109 if (op > OP_MATCH_MAX) {
1110 log_error("invalid KERNEL operation");
1111 goto invalid;
1112 }
1113 rule_add_key(&rule_tmp, TK_M_KERNEL, op, value, NULL);
1114 continue;
1115 }
1116
1117 if (streq(key, "SUBSYSTEM")) {
1118 if (op > OP_MATCH_MAX) {
1119 log_error("invalid SUBSYSTEM operation");
1120 goto invalid;
1121 }
1122 /* bus, class, subsystem events should all be the same */
1123 if (streq(value, "subsystem") ||
1124 streq(value, "bus") ||
1125 streq(value, "class")) {
1126 if (streq(value, "bus") || streq(value, "class"))
1127 log_error("'%s' must be specified as 'subsystem' "
1128 "please fix it in %s:%u", value, filename, lineno);
1129 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, "subsystem|class|bus", NULL);
1130 } else
1131 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, value, NULL);
1132 continue;
1133 }
1134
1135 if (streq(key, "DRIVER")) {
1136 if (op > OP_MATCH_MAX) {
1137 log_error("invalid DRIVER operation");
1138 goto invalid;
1139 }
1140 rule_add_key(&rule_tmp, TK_M_DRIVER, op, value, NULL);
1141 continue;
1142 }
1143
1144 if (startswith(key, "ATTR{")) {
1145 attr = get_key_attribute(rules->udev, key + strlen("ATTR"));
1146 if (attr == NULL) {
1147 log_error("error parsing ATTR attribute");
1148 goto invalid;
1149 }
1150 if (op < OP_MATCH_MAX) {
1151 rule_add_key(&rule_tmp, TK_M_ATTR, op, value, attr);
1152 } else {
1153 rule_add_key(&rule_tmp, TK_A_ATTR, op, value, attr);
1154 }
1155 continue;
1156 }
1157
1158 if (startswith(key, "SECLABEL{")) {
1159 attr = get_key_attribute(rules->udev, key + strlen("SECLABEL"));
1160 if (!attr) {
1161 log_error("error parsing SECLABEL attribute");
1162 goto invalid;
1163 }
1164
1165 rule_add_key(&rule_tmp, TK_A_SECLABEL, op, value, attr);
1166 continue;
1167 }
1168
1169 if (streq(key, "KERNELS")) {
1170 if (op > OP_MATCH_MAX) {
1171 log_error("invalid KERNELS operation");
1172 goto invalid;
1173 }
1174 rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1175 continue;
1176 }
1177
1178 if (streq(key, "SUBSYSTEMS")) {
1179 if (op > OP_MATCH_MAX) {
1180 log_error("invalid SUBSYSTEMS operation");
1181 goto invalid;
1182 }
1183 rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1184 continue;
1185 }
1186
1187 if (streq(key, "DRIVERS")) {
1188 if (op > OP_MATCH_MAX) {
1189 log_error("invalid DRIVERS operation");
1190 goto invalid;
1191 }
1192 rule_add_key(&rule_tmp, TK_M_DRIVERS, op, value, NULL);
1193 continue;
1194 }
1195
1196 if (startswith(key, "ATTRS{")) {
1197 if (op > OP_MATCH_MAX) {
1198 log_error("invalid ATTRS operation");
1199 goto invalid;
1200 }
1201 attr = get_key_attribute(rules->udev, key + strlen("ATTRS"));
1202 if (attr == NULL) {
1203 log_error("error parsing ATTRS attribute");
1204 goto invalid;
1205 }
1206 if (startswith(attr, "device/"))
1207 log_error("the 'device' link may not be available in a future kernel, "
1208 "please fix it in %s:%u", filename, lineno);
1209 else if (strstr(attr, "../") != NULL)
1210 log_error("do not reference parent sysfs directories directly, "
1211 "it may break with a future kernel, please fix it in %s:%u", filename, lineno);
1212 rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1213 continue;
1214 }
1215
1216 if (streq(key, "TAGS")) {
1217 if (op > OP_MATCH_MAX) {
1218 log_error("invalid TAGS operation");
1219 goto invalid;
1220 }
1221 rule_add_key(&rule_tmp, TK_M_TAGS, op, value, NULL);
1222 continue;
1223 }
1224
1225 if (startswith(key, "ENV{")) {
1226 attr = get_key_attribute(rules->udev, key + strlen("ENV"));
1227 if (attr == NULL) {
1228 log_error("error parsing ENV attribute");
1229 goto invalid;
1230 }
1231 if (op < OP_MATCH_MAX) {
1232 if (rule_add_key(&rule_tmp, TK_M_ENV, op, value, attr) != 0)
1233 goto invalid;
1234 } else {
1235 static const char *blacklist[] = {
1236 "ACTION",
1237 "SUBSYSTEM",
1238 "DEVTYPE",
1239 "MAJOR",
1240 "MINOR",
1241 "DRIVER",
1242 "IFINDEX",
1243 "DEVNAME",
1244 "DEVLINKS",
1245 "DEVPATH",
1246 "TAGS",
1247 };
1248 unsigned int i;
1249
1250 for (i = 0; i < ELEMENTSOF(blacklist); i++) {
1251 if (!streq(attr, blacklist[i]))
1252 continue;
1253 log_error("invalid ENV attribute, '%s' can not be set %s:%u", attr, filename, lineno);
1254 goto invalid;
1255 }
1256 if (rule_add_key(&rule_tmp, TK_A_ENV, op, value, attr) != 0)
1257 goto invalid;
1258 }
1259 continue;
1260 }
1261
1262 if (streq(key, "TAG")) {
1263 if (op < OP_MATCH_MAX)
1264 rule_add_key(&rule_tmp, TK_M_TAG, op, value, NULL);
1265 else
1266 rule_add_key(&rule_tmp, TK_A_TAG, op, value, NULL);
1267 continue;
1268 }
1269
1270 if (streq(key, "PROGRAM")) {
1271 rule_add_key(&rule_tmp, TK_M_PROGRAM, op, value, NULL);
1272 continue;
1273 }
1274
1275 if (streq(key, "RESULT")) {
1276 if (op > OP_MATCH_MAX) {
1277 log_error("invalid RESULT operation");
1278 goto invalid;
1279 }
1280 rule_add_key(&rule_tmp, TK_M_RESULT, op, value, NULL);
1281 continue;
1282 }
1283
1284 if (startswith(key, "IMPORT")) {
1285 attr = get_key_attribute(rules->udev, key + strlen("IMPORT"));
1286 if (attr == NULL) {
1287 log_error("IMPORT{} type missing, ignoring IMPORT %s:%u", filename, lineno);
1288 continue;
1289 }
1290 if (streq(attr, "program")) {
1291 /* find known built-in command */
1292 if (value[0] != '/') {
1293 enum udev_builtin_cmd cmd;
1294
1295 cmd = udev_builtin_lookup(value);
1296 if (cmd < UDEV_BUILTIN_MAX) {
1297 log_debug("IMPORT found builtin '%s', replacing %s:%u",
1298 value, filename, lineno);
1299 rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, value, &cmd);
1300 continue;
1301 }
1302 }
1303 rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1304 } else if (streq(attr, "builtin")) {
1305 enum udev_builtin_cmd cmd = udev_builtin_lookup(value);
1306
1307 if (cmd < UDEV_BUILTIN_MAX)
1308 rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, value, &cmd);
1309 else
1310 log_error("IMPORT{builtin}: '%s' unknown %s:%u", value, filename, lineno);
1311 } else if (streq(attr, "file")) {
1312 rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1313 } else if (streq(attr, "db")) {
1314 rule_add_key(&rule_tmp, TK_M_IMPORT_DB, op, value, NULL);
1315 } else if (streq(attr, "cmdline")) {
1316 rule_add_key(&rule_tmp, TK_M_IMPORT_CMDLINE, op, value, NULL);
1317 } else if (streq(attr, "parent")) {
1318 rule_add_key(&rule_tmp, TK_M_IMPORT_PARENT, op, value, NULL);
1319 } else
1320 log_error("IMPORT{} unknown type, ignoring IMPORT %s:%u", filename, lineno);
1321 continue;
1322 }
1323
1324 if (startswith(key, "TEST")) {
1325 mode_t mode = 0;
1326
1327 if (op > OP_MATCH_MAX) {
1328 log_error("invalid TEST operation");
1329 goto invalid;
1330 }
1331 attr = get_key_attribute(rules->udev, key + strlen("TEST"));
1332 if (attr != NULL) {
1333 mode = strtol(attr, NULL, 8);
1334 rule_add_key(&rule_tmp, TK_M_TEST, op, value, &mode);
1335 } else {
1336 rule_add_key(&rule_tmp, TK_M_TEST, op, value, NULL);
1337 }
1338 continue;
1339 }
1340
1341 if (startswith(key, "RUN")) {
1342 attr = get_key_attribute(rules->udev, key + strlen("RUN"));
1343 if (attr == NULL)
1344 attr = "program";
1345
1346 if (streq(attr, "builtin")) {
1347 enum udev_builtin_cmd cmd = udev_builtin_lookup(value);
1348
1349 if (cmd < UDEV_BUILTIN_MAX)
1350 rule_add_key(&rule_tmp, TK_A_RUN_BUILTIN, op, value, &cmd);
1351 else
1352 log_error("IMPORT{builtin}: '%s' unknown %s:%u", value, filename, lineno);
1353 } else if (streq(attr, "program")) {
1354 enum udev_builtin_cmd cmd = UDEV_BUILTIN_MAX;
1355
1356 rule_add_key(&rule_tmp, TK_A_RUN_PROGRAM, op, value, &cmd);
1357 } else {
1358 log_error("RUN{} unknown type, ignoring RUN %s:%u", filename, lineno);
1359 }
1360
1361 continue;
1362 }
1363
1364 if (streq(key, "WAIT_FOR") || streq(key, "WAIT_FOR_SYSFS")) {
1365 rule_add_key(&rule_tmp, TK_M_WAITFOR, 0, value, NULL);
1366 continue;
1367 }
1368
1369 if (streq(key, "LABEL")) {
1370 rule_tmp.rule.rule.label_off = rules_add_string(rules, value);
1371 continue;
1372 }
1373
1374 if (streq(key, "GOTO")) {
1375 rule_add_key(&rule_tmp, TK_A_GOTO, 0, value, NULL);
1376 continue;
1377 }
1378
1379 if (startswith(key, "NAME")) {
1380 if (op < OP_MATCH_MAX) {
1381 rule_add_key(&rule_tmp, TK_M_NAME, op, value, NULL);
1382 } else {
1383 if (streq(value, "%k")) {
1384 log_error("NAME=\"%%k\" is ignored, because it breaks kernel supplied names, "
1385 "please remove it from %s:%u\n", filename, lineno);
1386 continue;
1387 }
1388 if (value[0] == '\0') {
1389 log_debug("NAME=\"\" is ignored, because udev will not delete any device nodes, "
1390 "please remove it from %s:%u\n", filename, lineno);
1391 continue;
1392 }
1393 rule_add_key(&rule_tmp, TK_A_NAME, op, value, NULL);
1394 }
1395 rule_tmp.rule.rule.can_set_name = true;
1396 continue;
1397 }
1398
1399 if (streq(key, "SYMLINK")) {
1400 if (op < OP_MATCH_MAX)
1401 rule_add_key(&rule_tmp, TK_M_DEVLINK, op, value, NULL);
1402 else
1403 rule_add_key(&rule_tmp, TK_A_DEVLINK, op, value, NULL);
1404 rule_tmp.rule.rule.can_set_name = true;
1405 continue;
1406 }
1407
1408 if (streq(key, "OWNER")) {
1409 uid_t uid;
1410 char *endptr;
1411
1412 uid = strtoul(value, &endptr, 10);
1413 if (endptr[0] == '\0') {
1414 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1415 } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1416 uid = add_uid(rules, value);
1417 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1418 } else if (rules->resolve_names >= 0) {
1419 rule_add_key(&rule_tmp, TK_A_OWNER, op, value, NULL);
1420 }
1421 rule_tmp.rule.rule.can_set_name = true;
1422 continue;
1423 }
1424
1425 if (streq(key, "GROUP")) {
1426 gid_t gid;
1427 char *endptr;
1428
1429 gid = strtoul(value, &endptr, 10);
1430 if (endptr[0] == '\0') {
1431 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1432 } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1433 gid = add_gid(rules, value);
1434 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1435 } else if (rules->resolve_names >= 0) {
1436 rule_add_key(&rule_tmp, TK_A_GROUP, op, value, NULL);
1437 }
1438 rule_tmp.rule.rule.can_set_name = true;
1439 continue;
1440 }
1441
1442 if (streq(key, "MODE")) {
1443 mode_t mode;
1444 char *endptr;
1445
1446 mode = strtol(value, &endptr, 8);
1447 if (endptr[0] == '\0')
1448 rule_add_key(&rule_tmp, TK_A_MODE_ID, op, NULL, &mode);
1449 else
1450 rule_add_key(&rule_tmp, TK_A_MODE, op, value, NULL);
1451 rule_tmp.rule.rule.can_set_name = true;
1452 continue;
1453 }
1454
1455 if (streq(key, "OPTIONS")) {
1456 const char *pos;
1457
1458 pos = strstr(value, "link_priority=");
1459 if (pos != NULL) {
1460 int prio = atoi(&pos[strlen("link_priority=")]);
1461
1462 rule_add_key(&rule_tmp, TK_A_DEVLINK_PRIO, op, NULL, &prio);
1463 }
1464
1465 pos = strstr(value, "event_timeout=");
1466 if (pos != NULL) {
1467 int tout = atoi(&pos[strlen("event_timeout=")]);
1468
1469 rule_add_key(&rule_tmp, TK_M_EVENT_TIMEOUT, op, NULL, &tout);
1470 }
1471
1472 pos = strstr(value, "string_escape=");
1473 if (pos != NULL) {
1474 pos = &pos[strlen("string_escape=")];
1475 if (startswith(pos, "none"))
1476 rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_NONE, op, NULL, NULL);
1477 else if (startswith(pos, "replace"))
1478 rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_REPLACE, op, NULL, NULL);
1479 }
1480
1481 pos = strstr(value, "db_persist");
1482 if (pos != NULL)
1483 rule_add_key(&rule_tmp, TK_A_DB_PERSIST, op, NULL, NULL);
1484
1485 pos = strstr(value, "nowatch");
1486 if (pos != NULL) {
1487 const int off = 0;
1488
1489 rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &off);
1490 } else {
1491 pos = strstr(value, "watch");
1492 if (pos != NULL) {
1493 const int on = 1;
1494
1495 rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &on);
1496 }
1497 }
1498
1499 pos = strstr(value, "static_node=");
1500 if (pos != NULL) {
1501 rule_add_key(&rule_tmp, TK_A_STATIC_NODE, op, &pos[strlen("static_node=")], NULL);
1502 rule_tmp.rule.rule.has_static_node = true;
1503 }
1504
1505 continue;
1506 }
1507
1508 log_error("unknown key '%s' in %s:%u", key, filename, lineno);
1509 goto invalid;
1510 }
1511
1512 /* add rule token */
1513 rule_tmp.rule.rule.token_count = 1 + rule_tmp.token_cur;
1514 if (add_token(rules, &rule_tmp.rule) != 0)
1515 goto invalid;
1516
1517 /* add tokens to list, sorted by type */
1518 if (sort_token(rules, &rule_tmp) != 0)
1519 goto invalid;
1520
1521 return 0;
1522 invalid:
1523 log_error("invalid rule '%s:%u'", filename, lineno);
1524 return -1;
1525 }
1526
1527 static int parse_file(struct udev_rules *rules, const char *filename)
1528 {
1529 FILE *f;
1530 unsigned int first_token;
1531 unsigned int filename_off;
1532 char line[UTIL_LINE_SIZE];
1533 int line_nr = 0;
1534 unsigned int i;
1535
1536 if (null_or_empty_path(filename)) {
1537 log_debug("skip empty file: %s", filename);
1538 return 0;
1539 }
1540 log_debug("read rules file: %s", filename);
1541
1542 f = fopen(filename, "re");
1543 if (f == NULL)
1544 return -1;
1545
1546 first_token = rules->token_cur;
1547 filename_off = rules_add_string(rules, filename);
1548
1549 while (fgets(line, sizeof(line), f) != NULL) {
1550 char *key;
1551 size_t len;
1552
1553 /* skip whitespace */
1554 line_nr++;
1555 key = line;
1556 while (isspace(key[0]))
1557 key++;
1558
1559 /* comment */
1560 if (key[0] == '#')
1561 continue;
1562
1563 len = strlen(line);
1564 if (len < 3)
1565 continue;
1566
1567 /* continue reading if backslash+newline is found */
1568 while (line[len-2] == '\\') {
1569 if (fgets(&line[len-2], (sizeof(line)-len)+2, f) == NULL)
1570 break;
1571 if (strlen(&line[len-2]) < 2)
1572 break;
1573 line_nr++;
1574 len = strlen(line);
1575 }
1576
1577 if (len+1 >= sizeof(line)) {
1578 log_error("line too long '%s':%u, ignored", filename, line_nr);
1579 continue;
1580 }
1581 add_rule(rules, key, filename, filename_off, line_nr);
1582 }
1583 fclose(f);
1584
1585 /* link GOTOs to LABEL rules in this file to be able to fast-forward */
1586 for (i = first_token+1; i < rules->token_cur; i++) {
1587 if (rules->tokens[i].type == TK_A_GOTO) {
1588 char *label = rules_str(rules, rules->tokens[i].key.value_off);
1589 unsigned int j;
1590
1591 for (j = i+1; j < rules->token_cur; j++) {
1592 if (rules->tokens[j].type != TK_RULE)
1593 continue;
1594 if (rules->tokens[j].rule.label_off == 0)
1595 continue;
1596 if (!streq(label, rules_str(rules, rules->tokens[j].rule.label_off)))
1597 continue;
1598 rules->tokens[i].key.rule_goto = j;
1599 break;
1600 }
1601 if (rules->tokens[i].key.rule_goto == 0)
1602 log_error("GOTO '%s' has no matching label in: '%s'", label, filename);
1603 }
1604 }
1605 return 0;
1606 }
1607
1608 struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
1609 {
1610 struct udev_rules *rules;
1611 struct udev_list file_list;
1612 struct token end_token;
1613 char **files, **f;
1614 int r;
1615
1616 rules = new0(struct udev_rules, 1);
1617 if (rules == NULL)
1618 return NULL;
1619 rules->udev = udev;
1620 rules->resolve_names = resolve_names;
1621 udev_list_init(udev, &file_list, true);
1622
1623 /* init token array and string buffer */
1624 rules->tokens = malloc(PREALLOC_TOKEN * sizeof(struct token));
1625 if (rules->tokens == NULL)
1626 return udev_rules_unref(rules);
1627 rules->token_max = PREALLOC_TOKEN;
1628
1629 rules->strbuf = strbuf_new();
1630 if (!rules->strbuf)
1631 return udev_rules_unref(rules);
1632
1633 udev_rules_check_timestamp(rules);
1634
1635 r = conf_files_list_strv(&files, ".rules", NULL, rules_dirs);
1636 if (r < 0) {
1637 log_error("failed to enumerate rules files: %s", strerror(-r));
1638 return udev_rules_unref(rules);
1639 }
1640
1641 /*
1642 * The offset value in the rules strct is limited; add all
1643 * rules file names to the beginning of the string buffer.
1644 */
1645 STRV_FOREACH(f, files)
1646 rules_add_string(rules, *f);
1647
1648 STRV_FOREACH(f, files)
1649 parse_file(rules, *f);
1650
1651 strv_free(files);
1652
1653 memzero(&end_token, sizeof(struct token));
1654 end_token.type = TK_END;
1655 add_token(rules, &end_token);
1656 log_debug("rules contain %zu bytes tokens (%u * %zu bytes), %zu bytes strings",
1657 rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->strbuf->len);
1658
1659 /* cleanup temporary strbuf data */
1660 log_debug("%zu strings (%zu bytes), %zu de-duplicated (%zu bytes), %zu trie nodes used",
1661 rules->strbuf->in_count, rules->strbuf->in_len,
1662 rules->strbuf->dedup_count, rules->strbuf->dedup_len, rules->strbuf->nodes_count);
1663 strbuf_complete(rules->strbuf);
1664
1665 /* cleanup uid/gid cache */
1666 free(rules->uids);
1667 rules->uids = NULL;
1668 rules->uids_cur = 0;
1669 rules->uids_max = 0;
1670 free(rules->gids);
1671 rules->gids = NULL;
1672 rules->gids_cur = 0;
1673 rules->gids_max = 0;
1674
1675 dump_rules(rules);
1676 return rules;
1677 }
1678
1679 struct udev_rules *udev_rules_unref(struct udev_rules *rules)
1680 {
1681 if (rules == NULL)
1682 return NULL;
1683 free(rules->tokens);
1684 strbuf_cleanup(rules->strbuf);
1685 free(rules->uids);
1686 free(rules->gids);
1687 free(rules);
1688 return NULL;
1689 }
1690
1691 bool udev_rules_check_timestamp(struct udev_rules *rules)
1692 {
1693 if (!rules)
1694 return false;
1695
1696 return paths_check_timestamp(rules_dirs, &rules->dirs_ts_usec, true);
1697 }
1698
1699 static int match_key(struct udev_rules *rules, struct token *token, const char *val)
1700 {
1701 char *key_value = rules_str(rules, token->key.value_off);
1702 char *pos;
1703 bool match = false;
1704
1705 if (val == NULL)
1706 val = "";
1707
1708 switch (token->key.glob) {
1709 case GL_PLAIN:
1710 match = (streq(key_value, val));
1711 break;
1712 case GL_GLOB:
1713 match = (fnmatch(key_value, val, 0) == 0);
1714 break;
1715 case GL_SPLIT:
1716 {
1717 const char *s;
1718 size_t len;
1719
1720 s = rules_str(rules, token->key.value_off);
1721 len = strlen(val);
1722 for (;;) {
1723 const char *next;
1724
1725 next = strchr(s, '|');
1726 if (next != NULL) {
1727 size_t matchlen = (size_t)(next - s);
1728
1729 match = (matchlen == len && strneq(s, val, matchlen));
1730 if (match)
1731 break;
1732 } else {
1733 match = (streq(s, val));
1734 break;
1735 }
1736 s = &next[1];
1737 }
1738 break;
1739 }
1740 case GL_SPLIT_GLOB:
1741 {
1742 char value[UTIL_PATH_SIZE];
1743
1744 strscpy(value, sizeof(value), rules_str(rules, token->key.value_off));
1745 key_value = value;
1746 while (key_value != NULL) {
1747 pos = strchr(key_value, '|');
1748 if (pos != NULL) {
1749 pos[0] = '\0';
1750 pos = &pos[1];
1751 }
1752 match = (fnmatch(key_value, val, 0) == 0);
1753 if (match)
1754 break;
1755 key_value = pos;
1756 }
1757 break;
1758 }
1759 case GL_SOMETHING:
1760 match = (val[0] != '\0');
1761 break;
1762 case GL_UNSET:
1763 return -1;
1764 }
1765
1766 if (match && (token->key.op == OP_MATCH))
1767 return 0;
1768 if (!match && (token->key.op == OP_NOMATCH))
1769 return 0;
1770 return -1;
1771 }
1772
1773 static int match_attr(struct udev_rules *rules, struct udev_device *dev, struct udev_event *event, struct token *cur)
1774 {
1775 const char *name;
1776 char nbuf[UTIL_NAME_SIZE];
1777 const char *value;
1778 char vbuf[UTIL_NAME_SIZE];
1779 size_t len;
1780
1781 name = rules_str(rules, cur->key.attr_off);
1782 switch (cur->key.attrsubst) {
1783 case SB_FORMAT:
1784 udev_event_apply_format(event, name, nbuf, sizeof(nbuf));
1785 name = nbuf;
1786 /* fall through */
1787 case SB_NONE:
1788 value = udev_device_get_sysattr_value(dev, name);
1789 if (value == NULL)
1790 return -1;
1791 break;
1792 case SB_SUBSYS:
1793 if (util_resolve_subsys_kernel(event->udev, name, vbuf, sizeof(vbuf), 1) != 0)
1794 return -1;
1795 value = vbuf;
1796 break;
1797 default:
1798 return -1;
1799 }
1800
1801 /* remove trailing whitespace, if not asked to match for it */
1802 len = strlen(value);
1803 if (len > 0 && isspace(value[len-1])) {
1804 const char *key_value;
1805 size_t klen;
1806
1807 key_value = rules_str(rules, cur->key.value_off);
1808 klen = strlen(key_value);
1809 if (klen > 0 && !isspace(key_value[klen-1])) {
1810 if (value != vbuf) {
1811 strscpy(vbuf, sizeof(vbuf), value);
1812 value = vbuf;
1813 }
1814 while (len > 0 && isspace(vbuf[--len]))
1815 vbuf[len] = '\0';
1816 }
1817 }
1818
1819 return match_key(rules, cur, value);
1820 }
1821
1822 enum escape_type {
1823 ESCAPE_UNSET,
1824 ESCAPE_NONE,
1825 ESCAPE_REPLACE,
1826 };
1827
1828 int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event, const sigset_t *sigmask)
1829 {
1830 struct token *cur;
1831 struct token *rule;
1832 enum escape_type esc = ESCAPE_UNSET;
1833 bool can_set_name;
1834
1835 if (rules->tokens == NULL)
1836 return -1;
1837
1838 can_set_name = ((!streq(udev_device_get_action(event->dev), "remove")) &&
1839 (major(udev_device_get_devnum(event->dev)) > 0 ||
1840 udev_device_get_ifindex(event->dev) > 0));
1841
1842 /* loop through token list, match, run actions or forward to next rule */
1843 cur = &rules->tokens[0];
1844 rule = cur;
1845 for (;;) {
1846 dump_token(rules, cur);
1847 switch (cur->type) {
1848 case TK_RULE:
1849 /* current rule */
1850 rule = cur;
1851 /* possibly skip rules which want to set NAME, SYMLINK, OWNER, GROUP, MODE */
1852 if (!can_set_name && rule->rule.can_set_name)
1853 goto nomatch;
1854 esc = ESCAPE_UNSET;
1855 break;
1856 case TK_M_ACTION:
1857 if (match_key(rules, cur, udev_device_get_action(event->dev)) != 0)
1858 goto nomatch;
1859 break;
1860 case TK_M_DEVPATH:
1861 if (match_key(rules, cur, udev_device_get_devpath(event->dev)) != 0)
1862 goto nomatch;
1863 break;
1864 case TK_M_KERNEL:
1865 if (match_key(rules, cur, udev_device_get_sysname(event->dev)) != 0)
1866 goto nomatch;
1867 break;
1868 case TK_M_DEVLINK: {
1869 struct udev_list_entry *list_entry;
1870 bool match = false;
1871
1872 udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(event->dev)) {
1873 const char *devlink;
1874
1875 devlink = udev_list_entry_get_name(list_entry) + strlen("/dev/");
1876 if (match_key(rules, cur, devlink) == 0) {
1877 match = true;
1878 break;
1879 }
1880 }
1881 if (!match)
1882 goto nomatch;
1883 break;
1884 }
1885 case TK_M_NAME:
1886 if (match_key(rules, cur, event->name) != 0)
1887 goto nomatch;
1888 break;
1889 case TK_M_ENV: {
1890 const char *key_name = rules_str(rules, cur->key.attr_off);
1891 const char *value;
1892
1893 value = udev_device_get_property_value(event->dev, key_name);
1894 if (value == NULL)
1895 value = "";
1896 if (match_key(rules, cur, value))
1897 goto nomatch;
1898 break;
1899 }
1900 case TK_M_TAG: {
1901 struct udev_list_entry *list_entry;
1902 bool match = false;
1903
1904 udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(event->dev)) {
1905 if (streq(rules_str(rules, cur->key.value_off), udev_list_entry_get_name(list_entry))) {
1906 match = true;
1907 break;
1908 }
1909 }
1910 if (!match && (cur->key.op != OP_NOMATCH))
1911 goto nomatch;
1912 break;
1913 }
1914 case TK_M_SUBSYSTEM:
1915 if (match_key(rules, cur, udev_device_get_subsystem(event->dev)) != 0)
1916 goto nomatch;
1917 break;
1918 case TK_M_DRIVER:
1919 if (match_key(rules, cur, udev_device_get_driver(event->dev)) != 0)
1920 goto nomatch;
1921 break;
1922 case TK_M_WAITFOR: {
1923 char filename[UTIL_PATH_SIZE];
1924 int found;
1925
1926 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), filename, sizeof(filename));
1927 found = (wait_for_file(event->dev, filename, 10) == 0);
1928 if (!found && (cur->key.op != OP_NOMATCH))
1929 goto nomatch;
1930 break;
1931 }
1932 case TK_M_ATTR:
1933 if (match_attr(rules, event->dev, event, cur) != 0)
1934 goto nomatch;
1935 break;
1936 case TK_M_KERNELS:
1937 case TK_M_SUBSYSTEMS:
1938 case TK_M_DRIVERS:
1939 case TK_M_ATTRS:
1940 case TK_M_TAGS: {
1941 struct token *next;
1942
1943 /* get whole sequence of parent matches */
1944 next = cur;
1945 while (next->type > TK_M_PARENTS_MIN && next->type < TK_M_PARENTS_MAX)
1946 next++;
1947
1948 /* loop over parents */
1949 event->dev_parent = event->dev;
1950 for (;;) {
1951 struct token *key;
1952
1953 /* loop over sequence of parent match keys */
1954 for (key = cur; key < next; key++ ) {
1955 dump_token(rules, key);
1956 switch(key->type) {
1957 case TK_M_KERNELS:
1958 if (match_key(rules, key, udev_device_get_sysname(event->dev_parent)) != 0)
1959 goto try_parent;
1960 break;
1961 case TK_M_SUBSYSTEMS:
1962 if (match_key(rules, key, udev_device_get_subsystem(event->dev_parent)) != 0)
1963 goto try_parent;
1964 break;
1965 case TK_M_DRIVERS:
1966 if (match_key(rules, key, udev_device_get_driver(event->dev_parent)) != 0)
1967 goto try_parent;
1968 break;
1969 case TK_M_ATTRS:
1970 if (match_attr(rules, event->dev_parent, event, key) != 0)
1971 goto try_parent;
1972 break;
1973 case TK_M_TAGS: {
1974 bool match = udev_device_has_tag(event->dev_parent, rules_str(rules, cur->key.value_off));
1975
1976 if (match && key->key.op == OP_NOMATCH)
1977 goto try_parent;
1978 if (!match && key->key.op == OP_MATCH)
1979 goto try_parent;
1980 break;
1981 }
1982 default:
1983 goto nomatch;
1984 }
1985 }
1986 break;
1987
1988 try_parent:
1989 event->dev_parent = udev_device_get_parent(event->dev_parent);
1990 if (event->dev_parent == NULL)
1991 goto nomatch;
1992 }
1993 /* move behind our sequence of parent match keys */
1994 cur = next;
1995 continue;
1996 }
1997 case TK_M_TEST: {
1998 char filename[UTIL_PATH_SIZE];
1999 struct stat statbuf;
2000 int match;
2001
2002 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), filename, sizeof(filename));
2003 if (util_resolve_subsys_kernel(event->udev, filename, filename, sizeof(filename), 0) != 0) {
2004 if (filename[0] != '/') {
2005 char tmp[UTIL_PATH_SIZE];
2006
2007 strscpy(tmp, sizeof(tmp), filename);
2008 strscpyl(filename, sizeof(filename),
2009 udev_device_get_syspath(event->dev), "/", tmp, NULL);
2010 }
2011 }
2012 attr_subst_subdir(filename, sizeof(filename));
2013
2014 match = (stat(filename, &statbuf) == 0);
2015 if (match && cur->key.mode > 0)
2016 match = ((statbuf.st_mode & cur->key.mode) > 0);
2017 if (match && cur->key.op == OP_NOMATCH)
2018 goto nomatch;
2019 if (!match && cur->key.op == OP_MATCH)
2020 goto nomatch;
2021 break;
2022 }
2023 case TK_M_EVENT_TIMEOUT:
2024 log_debug("OPTIONS event_timeout=%u", cur->key.event_timeout);
2025 event->timeout_usec = cur->key.event_timeout * 1000 * 1000;
2026 break;
2027 case TK_M_PROGRAM: {
2028 char program[UTIL_PATH_SIZE];
2029 char **envp;
2030 char result[UTIL_PATH_SIZE];
2031
2032 free(event->program_result);
2033 event->program_result = NULL;
2034 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), program, sizeof(program));
2035 envp = udev_device_get_properties_envp(event->dev);
2036 log_debug("PROGRAM '%s' %s:%u",
2037 program,
2038 rules_str(rules, rule->rule.filename_off),
2039 rule->rule.filename_line);
2040
2041 if (udev_event_spawn(event, program, envp, sigmask, result, sizeof(result)) < 0) {
2042 if (cur->key.op != OP_NOMATCH)
2043 goto nomatch;
2044 } else {
2045 int count;
2046
2047 util_remove_trailing_chars(result, '\n');
2048 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2049 count = util_replace_chars(result, UDEV_ALLOWED_CHARS_INPUT);
2050 if (count > 0)
2051 log_debug("%i character(s) replaced" , count);
2052 }
2053 event->program_result = strdup(result);
2054 if (cur->key.op == OP_NOMATCH)
2055 goto nomatch;
2056 }
2057 break;
2058 }
2059 case TK_M_IMPORT_FILE: {
2060 char import[UTIL_PATH_SIZE];
2061
2062 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), import, sizeof(import));
2063 if (import_file_into_properties(event->dev, import) != 0)
2064 if (cur->key.op != OP_NOMATCH)
2065 goto nomatch;
2066 break;
2067 }
2068 case TK_M_IMPORT_PROG: {
2069 char import[UTIL_PATH_SIZE];
2070
2071 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), import, sizeof(import));
2072 log_debug("IMPORT '%s' %s:%u",
2073 import,
2074 rules_str(rules, rule->rule.filename_off),
2075 rule->rule.filename_line);
2076
2077 if (import_program_into_properties(event, import, sigmask) != 0)
2078 if (cur->key.op != OP_NOMATCH)
2079 goto nomatch;
2080 break;
2081 }
2082 case TK_M_IMPORT_BUILTIN: {
2083 char command[UTIL_PATH_SIZE];
2084
2085 if (udev_builtin_run_once(cur->key.builtin_cmd)) {
2086 /* check if we ran already */
2087 if (event->builtin_run & (1 << cur->key.builtin_cmd)) {
2088 log_debug("IMPORT builtin skip '%s' %s:%u",
2089 udev_builtin_name(cur->key.builtin_cmd),
2090 rules_str(rules, rule->rule.filename_off),
2091 rule->rule.filename_line);
2092 /* return the result from earlier run */
2093 if (event->builtin_ret & (1 << cur->key.builtin_cmd))
2094 if (cur->key.op != OP_NOMATCH)
2095 goto nomatch;
2096 break;
2097 }
2098 /* mark as ran */
2099 event->builtin_run |= (1 << cur->key.builtin_cmd);
2100 }
2101
2102 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), command, sizeof(command));
2103 log_debug("IMPORT builtin '%s' %s:%u",
2104 udev_builtin_name(cur->key.builtin_cmd),
2105 rules_str(rules, rule->rule.filename_off),
2106 rule->rule.filename_line);
2107
2108 if (udev_builtin_run(event->dev, cur->key.builtin_cmd, command, false) != 0) {
2109 /* remember failure */
2110 log_debug("IMPORT builtin '%s' returned non-zero",
2111 udev_builtin_name(cur->key.builtin_cmd));
2112 event->builtin_ret |= (1 << cur->key.builtin_cmd);
2113 if (cur->key.op != OP_NOMATCH)
2114 goto nomatch;
2115 }
2116 break;
2117 }
2118 case TK_M_IMPORT_DB: {
2119 const char *key = rules_str(rules, cur->key.value_off);
2120 const char *value;
2121
2122 value = udev_device_get_property_value(event->dev_db, key);
2123 if (value != NULL) {
2124 struct udev_list_entry *entry;
2125
2126 entry = udev_device_add_property(event->dev, key, value);
2127 udev_list_entry_set_num(entry, true);
2128 } else {
2129 if (cur->key.op != OP_NOMATCH)
2130 goto nomatch;
2131 }
2132 break;
2133 }
2134 case TK_M_IMPORT_CMDLINE: {
2135 FILE *f;
2136 bool imported = false;
2137
2138 f = fopen("/proc/cmdline", "re");
2139 if (f != NULL) {
2140 char cmdline[4096];
2141
2142 if (fgets(cmdline, sizeof(cmdline), f) != NULL) {
2143 const char *key = rules_str(rules, cur->key.value_off);
2144 char *pos;
2145
2146 pos = strstr(cmdline, key);
2147 if (pos != NULL) {
2148 struct udev_list_entry *entry;
2149
2150 pos += strlen(key);
2151 if (pos[0] == '\0' || isspace(pos[0])) {
2152 /* we import simple flags as 'FLAG=1' */
2153 entry = udev_device_add_property(event->dev, key, "1");
2154 udev_list_entry_set_num(entry, true);
2155 imported = true;
2156 } else if (pos[0] == '=') {
2157 const char *value;
2158
2159 pos++;
2160 value = pos;
2161 while (pos[0] != '\0' && !isspace(pos[0]))
2162 pos++;
2163 pos[0] = '\0';
2164 entry = udev_device_add_property(event->dev, key, value);
2165 udev_list_entry_set_num(entry, true);
2166 imported = true;
2167 }
2168 }
2169 }
2170 fclose(f);
2171 }
2172 if (!imported && cur->key.op != OP_NOMATCH)
2173 goto nomatch;
2174 break;
2175 }
2176 case TK_M_IMPORT_PARENT: {
2177 char import[UTIL_PATH_SIZE];
2178
2179 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), import, sizeof(import));
2180 if (import_parent_into_properties(event->dev, import) != 0)
2181 if (cur->key.op != OP_NOMATCH)
2182 goto nomatch;
2183 break;
2184 }
2185 case TK_M_RESULT:
2186 if (match_key(rules, cur, event->program_result) != 0)
2187 goto nomatch;
2188 break;
2189 case TK_A_STRING_ESCAPE_NONE:
2190 esc = ESCAPE_NONE;
2191 break;
2192 case TK_A_STRING_ESCAPE_REPLACE:
2193 esc = ESCAPE_REPLACE;
2194 break;
2195 case TK_A_DB_PERSIST:
2196 udev_device_set_db_persist(event->dev);
2197 break;
2198 case TK_A_INOTIFY_WATCH:
2199 if (event->inotify_watch_final)
2200 break;
2201 if (cur->key.op == OP_ASSIGN_FINAL)
2202 event->inotify_watch_final = true;
2203 event->inotify_watch = cur->key.watch;
2204 break;
2205 case TK_A_DEVLINK_PRIO:
2206 udev_device_set_devlink_priority(event->dev, cur->key.devlink_prio);
2207 break;
2208 case TK_A_OWNER: {
2209 char owner[UTIL_NAME_SIZE];
2210
2211 if (event->owner_final)
2212 break;
2213 if (cur->key.op == OP_ASSIGN_FINAL)
2214 event->owner_final = true;
2215 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), owner, sizeof(owner));
2216 event->owner_set = true;
2217 event->uid = util_lookup_user(event->udev, owner);
2218 log_debug("OWNER %u %s:%u",
2219 event->uid,
2220 rules_str(rules, rule->rule.filename_off),
2221 rule->rule.filename_line);
2222 break;
2223 }
2224 case TK_A_GROUP: {
2225 char group[UTIL_NAME_SIZE];
2226
2227 if (event->group_final)
2228 break;
2229 if (cur->key.op == OP_ASSIGN_FINAL)
2230 event->group_final = true;
2231 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), group, sizeof(group));
2232 event->group_set = true;
2233 event->gid = util_lookup_group(event->udev, group);
2234 log_debug("GROUP %u %s:%u",
2235 event->gid,
2236 rules_str(rules, rule->rule.filename_off),
2237 rule->rule.filename_line);
2238 break;
2239 }
2240 case TK_A_MODE: {
2241 char mode_str[UTIL_NAME_SIZE];
2242 mode_t mode;
2243 char *endptr;
2244
2245 if (event->mode_final)
2246 break;
2247 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), mode_str, sizeof(mode_str));
2248 mode = strtol(mode_str, &endptr, 8);
2249 if (endptr[0] != '\0') {
2250 log_error("ignoring invalid mode '%s'", mode_str);
2251 break;
2252 }
2253 if (cur->key.op == OP_ASSIGN_FINAL)
2254 event->mode_final = true;
2255 event->mode_set = true;
2256 event->mode = mode;
2257 log_debug("MODE %#o %s:%u",
2258 event->mode,
2259 rules_str(rules, rule->rule.filename_off),
2260 rule->rule.filename_line);
2261 break;
2262 }
2263 case TK_A_OWNER_ID:
2264 if (event->owner_final)
2265 break;
2266 if (cur->key.op == OP_ASSIGN_FINAL)
2267 event->owner_final = true;
2268 event->owner_set = true;
2269 event->uid = cur->key.uid;
2270 log_debug("OWNER %u %s:%u",
2271 event->uid,
2272 rules_str(rules, rule->rule.filename_off),
2273 rule->rule.filename_line);
2274 break;
2275 case TK_A_GROUP_ID:
2276 if (event->group_final)
2277 break;
2278 if (cur->key.op == OP_ASSIGN_FINAL)
2279 event->group_final = true;
2280 event->group_set = true;
2281 event->gid = cur->key.gid;
2282 log_debug("GROUP %u %s:%u",
2283 event->gid,
2284 rules_str(rules, rule->rule.filename_off),
2285 rule->rule.filename_line);
2286 break;
2287 case TK_A_MODE_ID:
2288 if (event->mode_final)
2289 break;
2290 if (cur->key.op == OP_ASSIGN_FINAL)
2291 event->mode_final = true;
2292 event->mode_set = true;
2293 event->mode = cur->key.mode;
2294 log_debug("MODE %#o %s:%u",
2295 event->mode,
2296 rules_str(rules, rule->rule.filename_off),
2297 rule->rule.filename_line);
2298 break;
2299 case TK_A_SECLABEL: {
2300 const char *name, *label;
2301
2302 name = rules_str(rules, cur->key.attr_off);
2303 label = rules_str(rules, cur->key.value_off);
2304 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2305 udev_list_cleanup(&event->seclabel_list);
2306 udev_list_entry_add(&event->seclabel_list, name, label);
2307 log_debug("SECLABEL{%s}='%s' %s:%u",
2308 name, label,
2309 rules_str(rules, rule->rule.filename_off),
2310 rule->rule.filename_line);
2311 break;
2312 }
2313 case TK_A_ENV: {
2314 const char *name = rules_str(rules, cur->key.attr_off);
2315 char *value = rules_str(rules, cur->key.value_off);
2316 char value_new[UTIL_NAME_SIZE];
2317 const char *value_old = NULL;
2318 struct udev_list_entry *entry;
2319
2320 if (value[0] == '\0') {
2321 if (cur->key.op == OP_ADD)
2322 break;
2323 udev_device_add_property(event->dev, name, NULL);
2324 break;
2325 }
2326
2327 if (cur->key.op == OP_ADD)
2328 value_old = udev_device_get_property_value(event->dev, name);
2329 if (value_old) {
2330 char temp[UTIL_NAME_SIZE];
2331
2332 /* append value separated by space */
2333 udev_event_apply_format(event, value, temp, sizeof(temp));
2334 strscpyl(value_new, sizeof(value_new), value_old, " ", temp, NULL);
2335 } else
2336 udev_event_apply_format(event, value, value_new, sizeof(value_new));
2337
2338 entry = udev_device_add_property(event->dev, name, value_new);
2339 /* store in db, skip private keys */
2340 if (name[0] != '.')
2341 udev_list_entry_set_num(entry, true);
2342 break;
2343 }
2344 case TK_A_TAG: {
2345 char tag[UTIL_PATH_SIZE];
2346 const char *p;
2347
2348 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), tag, sizeof(tag));
2349 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2350 udev_device_cleanup_tags_list(event->dev);
2351 for (p = tag; *p != '\0'; p++) {
2352 if ((*p >= 'a' && *p <= 'z') ||
2353 (*p >= 'A' && *p <= 'Z') ||
2354 (*p >= '0' && *p <= '9') ||
2355 *p == '-' || *p == '_')
2356 continue;
2357 log_error("ignoring invalid tag name '%s'", tag);
2358 break;
2359 }
2360 udev_device_add_tag(event->dev, tag);
2361 break;
2362 }
2363 case TK_A_NAME: {
2364 const char *name = rules_str(rules, cur->key.value_off);
2365
2366 char name_str[UTIL_PATH_SIZE];
2367 int count;
2368
2369 if (event->name_final)
2370 break;
2371 if (cur->key.op == OP_ASSIGN_FINAL)
2372 event->name_final = true;
2373 udev_event_apply_format(event, name, name_str, sizeof(name_str));
2374 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2375 count = util_replace_chars(name_str, "/");
2376 if (count > 0)
2377 log_debug("%i character(s) replaced", count);
2378 }
2379 if (major(udev_device_get_devnum(event->dev)) &&
2380 (!streq(name_str, udev_device_get_devnode(event->dev) + strlen("/dev/")))) {
2381 log_error("NAME=\"%s\" ignored, kernel device nodes "
2382 "can not be renamed; please fix it in %s:%u\n", name,
2383 rules_str(rules, rule->rule.filename_off), rule->rule.filename_line);
2384 break;
2385 }
2386 free(event->name);
2387 event->name = strdup(name_str);
2388 log_debug("NAME '%s' %s:%u",
2389 event->name,
2390 rules_str(rules, rule->rule.filename_off),
2391 rule->rule.filename_line);
2392 break;
2393 }
2394 case TK_A_DEVLINK: {
2395 char temp[UTIL_PATH_SIZE];
2396 char filename[UTIL_PATH_SIZE];
2397 char *pos, *next;
2398 int count = 0;
2399
2400 if (event->devlink_final)
2401 break;
2402 if (major(udev_device_get_devnum(event->dev)) == 0)
2403 break;
2404 if (cur->key.op == OP_ASSIGN_FINAL)
2405 event->devlink_final = true;
2406 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2407 udev_device_cleanup_devlinks_list(event->dev);
2408
2409 /* allow multiple symlinks separated by spaces */
2410 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), temp, sizeof(temp));
2411 if (esc == ESCAPE_UNSET)
2412 count = util_replace_chars(temp, "/ ");
2413 else if (esc == ESCAPE_REPLACE)
2414 count = util_replace_chars(temp, "/");
2415 if (count > 0)
2416 log_debug("%i character(s) replaced" , count);
2417 pos = temp;
2418 while (isspace(pos[0]))
2419 pos++;
2420 next = strchr(pos, ' ');
2421 while (next != NULL) {
2422 next[0] = '\0';
2423 log_debug("LINK '%s' %s:%u", pos,
2424 rules_str(rules, rule->rule.filename_off), rule->rule.filename_line);
2425 strscpyl(filename, sizeof(filename), "/dev/", pos, NULL);
2426 udev_device_add_devlink(event->dev, filename);
2427 while (isspace(next[1]))
2428 next++;
2429 pos = &next[1];
2430 next = strchr(pos, ' ');
2431 }
2432 if (pos[0] != '\0') {
2433 log_debug("LINK '%s' %s:%u", pos,
2434 rules_str(rules, rule->rule.filename_off), rule->rule.filename_line);
2435 strscpyl(filename, sizeof(filename), "/dev/", pos, NULL);
2436 udev_device_add_devlink(event->dev, filename);
2437 }
2438 break;
2439 }
2440 case TK_A_ATTR: {
2441 const char *key_name = rules_str(rules, cur->key.attr_off);
2442 char attr[UTIL_PATH_SIZE];
2443 char value[UTIL_NAME_SIZE];
2444 FILE *f;
2445
2446 if (util_resolve_subsys_kernel(event->udev, key_name, attr, sizeof(attr), 0) != 0)
2447 strscpyl(attr, sizeof(attr), udev_device_get_syspath(event->dev), "/", key_name, NULL);
2448 attr_subst_subdir(attr, sizeof(attr));
2449
2450 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), value, sizeof(value));
2451 log_debug("ATTR '%s' writing '%s' %s:%u", attr, value,
2452 rules_str(rules, rule->rule.filename_off),
2453 rule->rule.filename_line);
2454 f = fopen(attr, "we");
2455 if (f != NULL) {
2456 if (fprintf(f, "%s", value) <= 0)
2457 log_error("error writing ATTR{%s}: %m", attr);
2458 fclose(f);
2459 } else {
2460 log_error("error opening ATTR{%s} for writing: %m", attr);
2461 }
2462 break;
2463 }
2464 case TK_A_RUN_BUILTIN:
2465 case TK_A_RUN_PROGRAM: {
2466 struct udev_list_entry *entry;
2467
2468 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2469 udev_list_cleanup(&event->run_list);
2470 log_debug("RUN '%s' %s:%u",
2471 rules_str(rules, cur->key.value_off),
2472 rules_str(rules, rule->rule.filename_off),
2473 rule->rule.filename_line);
2474 entry = udev_list_entry_add(&event->run_list, rules_str(rules, cur->key.value_off), NULL);
2475 udev_list_entry_set_num(entry, cur->key.builtin_cmd);
2476 break;
2477 }
2478 case TK_A_GOTO:
2479 if (cur->key.rule_goto == 0)
2480 break;
2481 cur = &rules->tokens[cur->key.rule_goto];
2482 continue;
2483 case TK_END:
2484 return 0;
2485
2486 case TK_M_PARENTS_MIN:
2487 case TK_M_PARENTS_MAX:
2488 case TK_M_MAX:
2489 case TK_UNSET:
2490 log_error("wrong type %u", cur->type);
2491 goto nomatch;
2492 }
2493
2494 cur++;
2495 continue;
2496 nomatch:
2497 /* fast-forward to next rule */
2498 cur = rule + rule->rule.token_count;
2499 }
2500 }
2501
2502 int udev_rules_apply_static_dev_perms(struct udev_rules *rules)
2503 {
2504 struct token *cur;
2505 struct token *rule;
2506 uid_t uid = 0;
2507 gid_t gid = 0;
2508 mode_t mode = 0;
2509 _cleanup_strv_free_ char **tags = NULL;
2510 char **t;
2511 FILE *f = NULL;
2512 _cleanup_free_ char *path = NULL;
2513 int r = 0;
2514
2515 if (rules->tokens == NULL)
2516 return 0;
2517
2518 cur = &rules->tokens[0];
2519 rule = cur;
2520 for (;;) {
2521 switch (cur->type) {
2522 case TK_RULE:
2523 /* current rule */
2524 rule = cur;
2525
2526 /* skip rules without a static_node tag */
2527 if (!rule->rule.has_static_node)
2528 goto next;
2529
2530 uid = 0;
2531 gid = 0;
2532 mode = 0;
2533 strv_free(tags);
2534 tags = NULL;
2535 break;
2536 case TK_A_OWNER_ID:
2537 uid = cur->key.uid;
2538 break;
2539 case TK_A_GROUP_ID:
2540 gid = cur->key.gid;
2541 break;
2542 case TK_A_MODE_ID:
2543 mode = cur->key.mode;
2544 break;
2545 case TK_A_TAG:
2546 r = strv_extend(&tags, rules_str(rules, cur->key.value_off));
2547 if (r < 0)
2548 goto finish;
2549
2550 break;
2551 case TK_A_STATIC_NODE: {
2552 char device_node[UTIL_PATH_SIZE];
2553 char tags_dir[UTIL_PATH_SIZE];
2554 char tag_symlink[UTIL_PATH_SIZE];
2555 struct stat stats;
2556
2557 /* we assure, that the permissions tokens are sorted before the static token */
2558 if (mode == 0 && uid == 0 && gid == 0 && tags == NULL)
2559 goto next;
2560
2561 strscpyl(device_node, sizeof(device_node), "/dev/", rules_str(rules, cur->key.value_off), NULL);
2562
2563 /* export the tags to a directory as symlinks, allowing otherwise dead nodes to be tagged */
2564 if (tags) {
2565 STRV_FOREACH(t, tags) {
2566 _cleanup_free_ char *unescaped_filename = NULL;
2567
2568 strscpyl(tags_dir, sizeof(tags_dir), "/run/udev/static_node-tags/", *t, "/", NULL);
2569 r = mkdir_p(tags_dir, 0755);
2570 if (r < 0) {
2571 log_error("failed to create %s: %s", tags_dir, strerror(-r));
2572 return r;
2573 }
2574
2575 unescaped_filename = xescape(rules_str(rules, cur->key.value_off), "/.");
2576
2577 strscpyl(tag_symlink, sizeof(tag_symlink), tags_dir, unescaped_filename, NULL);
2578 r = symlink(device_node, tag_symlink);
2579 if (r < 0 && errno != EEXIST) {
2580 log_error("failed to create symlink %s -> %s: %m", tag_symlink, device_node);
2581 return -errno;
2582 } else
2583 r = 0;
2584 }
2585 }
2586
2587 /* don't touch the permissions if only the tags were set */
2588 if (mode == 0 && uid == 0 && gid == 0)
2589 break;
2590
2591 if (stat(device_node, &stats) != 0)
2592 break;
2593 if (!S_ISBLK(stats.st_mode) && !S_ISCHR(stats.st_mode))
2594 break;
2595
2596 if (mode == 0) {
2597 if (gid > 0)
2598 mode = 0660;
2599 else
2600 mode = 0600;
2601 }
2602 if (mode != (stats.st_mode & 01777)) {
2603 r = chmod(device_node, mode);
2604 if (r < 0) {
2605 log_error("failed to chmod '%s' %#o", device_node, mode);
2606 return -errno;
2607 } else
2608 log_debug("chmod '%s' %#o", device_node, mode);
2609 }
2610
2611 if ((uid != 0 && uid != stats.st_uid) || (gid != 0 && gid != stats.st_gid)) {
2612 r = chown(device_node, uid, gid);
2613 if (r < 0) {
2614 log_error("failed to chown '%s' %u %u ", device_node, uid, gid);
2615 return -errno;
2616 } else
2617 log_debug("chown '%s' %u %u", device_node, uid, gid);
2618 }
2619
2620 utimensat(AT_FDCWD, device_node, NULL, 0);
2621 break;
2622 }
2623 case TK_END:
2624 goto finish;
2625 }
2626
2627 cur++;
2628 continue;
2629 next:
2630 /* fast-forward to next rule */
2631 cur = rule + rule->rule.token_count;
2632 continue;
2633 }
2634
2635 finish:
2636 if (f) {
2637 fflush(f);
2638 fchmod(fileno(f), 0644);
2639 if (ferror(f) || rename(path, "/run/udev/static_node-tags") < 0) {
2640 r = -errno;
2641 unlink("/run/udev/static_node-tags");
2642 unlink(path);
2643 }
2644 fclose(f);
2645 }
2646
2647 return r;
2648 }
Unnamed repository; edit this file 'description' to name the repository.