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Merge pull request #516 from utezduyar/consistent-get-callback-return
[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 #include "sysctl-util.h"
39
40 #define PREALLOC_TOKEN 2048
41
42 struct uid_gid {
43 unsigned int name_off;
44 union {
45 uid_t uid;
46 gid_t gid;
47 };
48 };
49
50 static const char* const rules_dirs[] = {
51 "/etc/udev/rules.d",
52 "/run/udev/rules.d",
53 UDEVLIBEXECDIR "/rules.d",
54 NULL};
55
56 struct udev_rules {
57 struct udev *udev;
58 usec_t dirs_ts_usec;
59 int resolve_names;
60
61 /* every key in the rules file becomes a token */
62 struct token *tokens;
63 unsigned int token_cur;
64 unsigned int token_max;
65
66 /* all key strings are copied and de-duplicated in a single continuous string buffer */
67 struct strbuf *strbuf;
68
69 /* during rule parsing, uid/gid lookup results are cached */
70 struct uid_gid *uids;
71 unsigned int uids_cur;
72 unsigned int uids_max;
73 struct uid_gid *gids;
74 unsigned int gids_cur;
75 unsigned int gids_max;
76 };
77
78 static char *rules_str(struct udev_rules *rules, unsigned int off) {
79 return rules->strbuf->buf + off;
80 }
81
82 static unsigned int rules_add_string(struct udev_rules *rules, const char *s) {
83 return strbuf_add_string(rules->strbuf, s, strlen(s));
84 }
85
86 /* KEY=="", KEY!="", KEY+="", KEY-="", KEY="", KEY:="" */
87 enum operation_type {
88 OP_UNSET,
89
90 OP_MATCH,
91 OP_NOMATCH,
92 OP_MATCH_MAX,
93
94 OP_ADD,
95 OP_REMOVE,
96 OP_ASSIGN,
97 OP_ASSIGN_FINAL,
98 };
99
100 enum string_glob_type {
101 GL_UNSET,
102 GL_PLAIN, /* no special chars */
103 GL_GLOB, /* shell globs ?,*,[] */
104 GL_SPLIT, /* multi-value A|B */
105 GL_SPLIT_GLOB, /* multi-value with glob A*|B* */
106 GL_SOMETHING, /* commonly used "?*" */
107 };
108
109 enum string_subst_type {
110 SB_UNSET,
111 SB_NONE,
112 SB_FORMAT,
113 SB_SUBSYS,
114 };
115
116 /* tokens of a rule are sorted/handled in this order */
117 enum token_type {
118 TK_UNSET,
119 TK_RULE,
120
121 TK_M_ACTION, /* val */
122 TK_M_DEVPATH, /* val */
123 TK_M_KERNEL, /* val */
124 TK_M_DEVLINK, /* val */
125 TK_M_NAME, /* val */
126 TK_M_ENV, /* val, attr */
127 TK_M_TAG, /* val */
128 TK_M_SUBSYSTEM, /* val */
129 TK_M_DRIVER, /* val */
130 TK_M_WAITFOR, /* val */
131 TK_M_ATTR, /* val, attr */
132 TK_M_SYSCTL, /* val, attr */
133
134 TK_M_PARENTS_MIN,
135 TK_M_KERNELS, /* val */
136 TK_M_SUBSYSTEMS, /* val */
137 TK_M_DRIVERS, /* val */
138 TK_M_ATTRS, /* val, attr */
139 TK_M_TAGS, /* val */
140 TK_M_PARENTS_MAX,
141
142 TK_M_TEST, /* val, mode_t */
143 TK_M_PROGRAM, /* val */
144 TK_M_IMPORT_FILE, /* val */
145 TK_M_IMPORT_PROG, /* val */
146 TK_M_IMPORT_BUILTIN, /* val */
147 TK_M_IMPORT_DB, /* val */
148 TK_M_IMPORT_CMDLINE, /* val */
149 TK_M_IMPORT_PARENT, /* val */
150 TK_M_RESULT, /* val */
151 TK_M_MAX,
152
153 TK_A_STRING_ESCAPE_NONE,
154 TK_A_STRING_ESCAPE_REPLACE,
155 TK_A_DB_PERSIST,
156 TK_A_INOTIFY_WATCH, /* int */
157 TK_A_DEVLINK_PRIO, /* int */
158 TK_A_OWNER, /* val */
159 TK_A_GROUP, /* val */
160 TK_A_MODE, /* val */
161 TK_A_OWNER_ID, /* uid_t */
162 TK_A_GROUP_ID, /* gid_t */
163 TK_A_MODE_ID, /* mode_t */
164 TK_A_TAG, /* val */
165 TK_A_STATIC_NODE, /* val */
166 TK_A_SECLABEL, /* val, attr */
167 TK_A_ENV, /* val, attr */
168 TK_A_NAME, /* val */
169 TK_A_DEVLINK, /* val */
170 TK_A_ATTR, /* val, attr */
171 TK_A_SYSCTL, /* val, attr */
172 TK_A_RUN_BUILTIN, /* val, bool */
173 TK_A_RUN_PROGRAM, /* val, bool */
174 TK_A_GOTO, /* size_t */
175
176 TK_END,
177 };
178
179 /* we try to pack stuff in a way that we take only 12 bytes per token */
180 struct token {
181 union {
182 unsigned char type; /* same in rule and key */
183 struct {
184 enum token_type type:8;
185 bool can_set_name:1;
186 bool has_static_node:1;
187 unsigned int unused:6;
188 unsigned short token_count;
189 unsigned int label_off;
190 unsigned short filename_off;
191 unsigned short filename_line;
192 } rule;
193 struct {
194 enum token_type type:8;
195 enum operation_type op:8;
196 enum string_glob_type glob:8;
197 enum string_subst_type subst:4;
198 enum string_subst_type attrsubst:4;
199 unsigned int value_off;
200 union {
201 unsigned int attr_off;
202 unsigned int rule_goto;
203 mode_t mode;
204 uid_t uid;
205 gid_t gid;
206 int devlink_prio;
207 int watch;
208 enum udev_builtin_cmd builtin_cmd;
209 };
210 } key;
211 };
212 };
213
214 #define MAX_TK 64
215 struct rule_tmp {
216 struct udev_rules *rules;
217 struct token rule;
218 struct token token[MAX_TK];
219 unsigned int token_cur;
220 };
221
222 #ifdef DEBUG
223 static const char *operation_str(enum operation_type type) {
224 static const char *operation_strs[] = {
225 [OP_UNSET] = "UNSET",
226 [OP_MATCH] = "match",
227 [OP_NOMATCH] = "nomatch",
228 [OP_MATCH_MAX] = "MATCH_MAX",
229
230 [OP_ADD] = "add",
231 [OP_REMOVE] = "remove",
232 [OP_ASSIGN] = "assign",
233 [OP_ASSIGN_FINAL] = "assign-final",
234 } ;
235
236 return operation_strs[type];
237 }
238
239 static const char *string_glob_str(enum string_glob_type type) {
240 static const char *string_glob_strs[] = {
241 [GL_UNSET] = "UNSET",
242 [GL_PLAIN] = "plain",
243 [GL_GLOB] = "glob",
244 [GL_SPLIT] = "split",
245 [GL_SPLIT_GLOB] = "split-glob",
246 [GL_SOMETHING] = "split-glob",
247 };
248
249 return string_glob_strs[type];
250 }
251
252 static const char *token_str(enum token_type type) {
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 [TK_M_SYSCTL] = "M SYSCTL",
269
270 [TK_M_PARENTS_MIN] = "M PARENTS_MIN",
271 [TK_M_KERNELS] = "M KERNELS",
272 [TK_M_SUBSYSTEMS] = "M SUBSYSTEMS",
273 [TK_M_DRIVERS] = "M DRIVERS",
274 [TK_M_ATTRS] = "M ATTRS",
275 [TK_M_TAGS] = "M TAGS",
276 [TK_M_PARENTS_MAX] = "M PARENTS_MAX",
277
278 [TK_M_TEST] = "M TEST",
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_SYSCTL] = "A SYSCTL",
308 [TK_A_RUN_BUILTIN] = "A RUN_BUILTIN",
309 [TK_A_RUN_PROGRAM] = "A RUN_PROGRAM",
310 [TK_A_GOTO] = "A GOTO",
311
312 [TK_END] = "END",
313 };
314
315 return token_strs[type];
316 }
317
318 static void dump_token(struct udev_rules *rules, struct token *token) {
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_SYSCTL:
372 case TK_M_ATTRS:
373 case TK_M_ENV:
374 case TK_A_ATTR:
375 case TK_A_SYSCTL:
376 case TK_A_ENV:
377 log_debug("%s %s '%s' '%s'(%s)",
378 token_str(type), operation_str(op), attr, value, string_glob_str(glob));
379 break;
380 case TK_M_TAG:
381 case TK_A_TAG:
382 log_debug("%s %s '%s'", token_str(type), operation_str(op), value);
383 break;
384 case TK_A_STRING_ESCAPE_NONE:
385 case TK_A_STRING_ESCAPE_REPLACE:
386 case TK_A_DB_PERSIST:
387 log_debug("%s", token_str(type));
388 break;
389 case TK_M_TEST:
390 log_debug("%s %s '%s'(%s) %#o",
391 token_str(type), operation_str(op), value, string_glob_str(glob), token->key.mode);
392 break;
393 case TK_A_INOTIFY_WATCH:
394 log_debug("%s %u", token_str(type), token->key.watch);
395 break;
396 case TK_A_DEVLINK_PRIO:
397 log_debug("%s %u", token_str(type), token->key.devlink_prio);
398 break;
399 case TK_A_OWNER_ID:
400 log_debug("%s %s %u", token_str(type), operation_str(op), token->key.uid);
401 break;
402 case TK_A_GROUP_ID:
403 log_debug("%s %s %u", token_str(type), operation_str(op), token->key.gid);
404 break;
405 case TK_A_MODE_ID:
406 log_debug("%s %s %#o", token_str(type), operation_str(op), token->key.mode);
407 break;
408 case TK_A_STATIC_NODE:
409 log_debug("%s '%s'", token_str(type), value);
410 break;
411 case TK_A_SECLABEL:
412 log_debug("%s %s '%s' '%s'", token_str(type), operation_str(op), attr, value);
413 break;
414 case TK_A_GOTO:
415 log_debug("%s '%s' %u", token_str(type), value, token->key.rule_goto);
416 break;
417 case TK_END:
418 log_debug("* %s", token_str(type));
419 break;
420 case TK_M_PARENTS_MIN:
421 case TK_M_PARENTS_MAX:
422 case TK_M_MAX:
423 case TK_UNSET:
424 log_debug("unknown type %u", type);
425 break;
426 }
427 }
428
429 static void dump_rules(struct udev_rules *rules) {
430 unsigned int i;
431
432 log_debug("dumping %u (%zu bytes) tokens, %u (%zu bytes) strings",
433 rules->token_cur,
434 rules->token_cur * sizeof(struct token),
435 rules->buf_count,
436 rules->buf_cur);
437 for (i = 0; i < rules->token_cur; i++)
438 dump_token(rules, &rules->tokens[i]);
439 }
440 #else
441 static inline void dump_token(struct udev_rules *rules, struct token *token) {}
442 static inline void dump_rules(struct udev_rules *rules) {}
443 #endif /* DEBUG */
444
445 static int add_token(struct udev_rules *rules, struct token *token) {
446 /* grow buffer if needed */
447 if (rules->token_cur+1 >= rules->token_max) {
448 struct token *tokens;
449 unsigned int add;
450
451 /* double the buffer size */
452 add = rules->token_max;
453 if (add < 8)
454 add = 8;
455
456 tokens = realloc(rules->tokens, (rules->token_max + add ) * sizeof(struct token));
457 if (tokens == NULL)
458 return -1;
459 rules->tokens = tokens;
460 rules->token_max += add;
461 }
462 memcpy(&rules->tokens[rules->token_cur], token, sizeof(struct token));
463 rules->token_cur++;
464 return 0;
465 }
466
467 static uid_t add_uid(struct udev_rules *rules, const char *owner) {
468 unsigned int i;
469 uid_t uid = 0;
470 unsigned int off;
471 int r;
472
473 /* lookup, if we know it already */
474 for (i = 0; i < rules->uids_cur; i++) {
475 off = rules->uids[i].name_off;
476 if (streq(rules_str(rules, off), owner)) {
477 uid = rules->uids[i].uid;
478 return uid;
479 }
480 }
481 r = get_user_creds(&owner, &uid, NULL, NULL, NULL);
482 if (r < 0) {
483 if (r == -ENOENT || r == -ESRCH)
484 log_error("specified user '%s' unknown", owner);
485 else
486 log_error_errno(r, "error resolving user '%s': %m", owner);
487 }
488
489 /* grow buffer if needed */
490 if (rules->uids_cur+1 >= rules->uids_max) {
491 struct uid_gid *uids;
492 unsigned int add;
493
494 /* double the buffer size */
495 add = rules->uids_max;
496 if (add < 1)
497 add = 8;
498
499 uids = realloc(rules->uids, (rules->uids_max + add ) * sizeof(struct uid_gid));
500 if (uids == NULL)
501 return uid;
502 rules->uids = uids;
503 rules->uids_max += add;
504 }
505 rules->uids[rules->uids_cur].uid = uid;
506 off = rules_add_string(rules, owner);
507 if (off <= 0)
508 return uid;
509 rules->uids[rules->uids_cur].name_off = off;
510 rules->uids_cur++;
511 return uid;
512 }
513
514 static gid_t add_gid(struct udev_rules *rules, const char *group) {
515 unsigned int i;
516 gid_t gid = 0;
517 unsigned int off;
518 int r;
519
520 /* lookup, if we know it already */
521 for (i = 0; i < rules->gids_cur; i++) {
522 off = rules->gids[i].name_off;
523 if (streq(rules_str(rules, off), group)) {
524 gid = rules->gids[i].gid;
525 return gid;
526 }
527 }
528 r = get_group_creds(&group, &gid);
529 if (r < 0) {
530 if (r == -ENOENT || r == -ESRCH)
531 log_error("specified group '%s' unknown", group);
532 else
533 log_error_errno(r, "error resolving group '%s': %m", group);
534 }
535
536 /* grow buffer if needed */
537 if (rules->gids_cur+1 >= rules->gids_max) {
538 struct uid_gid *gids;
539 unsigned int add;
540
541 /* double the buffer size */
542 add = rules->gids_max;
543 if (add < 1)
544 add = 8;
545
546 gids = realloc(rules->gids, (rules->gids_max + add ) * sizeof(struct uid_gid));
547 if (gids == NULL)
548 return gid;
549 rules->gids = gids;
550 rules->gids_max += add;
551 }
552 rules->gids[rules->gids_cur].gid = gid;
553 off = rules_add_string(rules, group);
554 if (off <= 0)
555 return gid;
556 rules->gids[rules->gids_cur].name_off = off;
557 rules->gids_cur++;
558 return gid;
559 }
560
561 static int import_property_from_string(struct udev_device *dev, char *line) {
562 char *key;
563 char *val;
564 size_t len;
565
566 /* find key */
567 key = line;
568 while (isspace(key[0]))
569 key++;
570
571 /* comment or empty line */
572 if (key[0] == '#' || key[0] == '\0')
573 return -1;
574
575 /* split key/value */
576 val = strchr(key, '=');
577 if (val == NULL)
578 return -1;
579 val[0] = '\0';
580 val++;
581
582 /* find value */
583 while (isspace(val[0]))
584 val++;
585
586 /* terminate key */
587 len = strlen(key);
588 if (len == 0)
589 return -1;
590 while (isspace(key[len-1]))
591 len--;
592 key[len] = '\0';
593
594 /* terminate value */
595 len = strlen(val);
596 if (len == 0)
597 return -1;
598 while (isspace(val[len-1]))
599 len--;
600 val[len] = '\0';
601
602 if (len == 0)
603 return -1;
604
605 /* unquote */
606 if (val[0] == '"' || val[0] == '\'') {
607 if (val[len-1] != val[0]) {
608 log_debug("inconsistent quoting: '%s', skip", line);
609 return -1;
610 }
611 val[len-1] = '\0';
612 val++;
613 }
614
615 udev_device_add_property(dev, key, val);
616
617 return 0;
618 }
619
620 static int import_file_into_properties(struct udev_device *dev, const char *filename) {
621 FILE *f;
622 char line[UTIL_LINE_SIZE];
623
624 f = fopen(filename, "re");
625 if (f == NULL)
626 return -1;
627 while (fgets(line, sizeof(line), f) != NULL)
628 import_property_from_string(dev, line);
629 fclose(f);
630 return 0;
631 }
632
633 static int import_program_into_properties(struct udev_event *event,
634 usec_t timeout_usec,
635 usec_t timeout_warn_usec,
636 const char *program) {
637 char result[UTIL_LINE_SIZE];
638 char *line;
639 int err;
640
641 err = udev_event_spawn(event, timeout_usec, timeout_warn_usec, true, program, result, sizeof(result));
642 if (err < 0)
643 return err;
644
645 line = result;
646 while (line != NULL) {
647 char *pos;
648
649 pos = strchr(line, '\n');
650 if (pos != NULL) {
651 pos[0] = '\0';
652 pos = &pos[1];
653 }
654 import_property_from_string(event->dev, line);
655 line = pos;
656 }
657 return 0;
658 }
659
660 static int import_parent_into_properties(struct udev_device *dev, const char *filter) {
661 struct udev_device *dev_parent;
662 struct udev_list_entry *list_entry;
663
664 assert(dev);
665 assert(filter);
666
667 dev_parent = udev_device_get_parent(dev);
668 if (dev_parent == NULL)
669 return -1;
670
671 udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(dev_parent)) {
672 const char *key = udev_list_entry_get_name(list_entry);
673 const char *val = udev_list_entry_get_value(list_entry);
674
675 if (fnmatch(filter, key, 0) == 0) {
676 udev_device_add_property(dev, key, val);
677 }
678 }
679 return 0;
680 }
681
682 static int attr_subst_subdir(char *attr, size_t len) {
683 bool found = false;
684
685 if (strstr(attr, "/*/")) {
686 char *pos;
687 char dirname[UTIL_PATH_SIZE];
688 const char *tail;
689 DIR *dir;
690
691 strscpy(dirname, sizeof(dirname), attr);
692 pos = strstr(dirname, "/*/");
693 if (pos == NULL)
694 return -1;
695 pos[0] = '\0';
696 tail = &pos[2];
697 dir = opendir(dirname);
698 if (dir != NULL) {
699 struct dirent *dent;
700
701 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
702 struct stat stats;
703
704 if (dent->d_name[0] == '.')
705 continue;
706 strscpyl(attr, len, dirname, "/", dent->d_name, tail, NULL);
707 if (stat(attr, &stats) == 0) {
708 found = true;
709 break;
710 }
711 }
712 closedir(dir);
713 }
714 }
715
716 return found;
717 }
718
719 static int get_key(struct udev *udev, char **line, char **key, enum operation_type *op, char **value) {
720 char *linepos;
721 char *temp;
722
723 linepos = *line;
724 if (linepos == NULL || linepos[0] == '\0')
725 return -1;
726
727 /* skip whitespace */
728 while (isspace(linepos[0]) || linepos[0] == ',')
729 linepos++;
730
731 /* get the key */
732 if (linepos[0] == '\0')
733 return -1;
734 *key = linepos;
735
736 for (;;) {
737 linepos++;
738 if (linepos[0] == '\0')
739 return -1;
740 if (isspace(linepos[0]))
741 break;
742 if (linepos[0] == '=')
743 break;
744 if ((linepos[0] == '+') || (linepos[0] == '-') || (linepos[0] == '!') || (linepos[0] == ':'))
745 if (linepos[1] == '=')
746 break;
747 }
748
749 /* remember end of key */
750 temp = linepos;
751
752 /* skip whitespace after key */
753 while (isspace(linepos[0]))
754 linepos++;
755 if (linepos[0] == '\0')
756 return -1;
757
758 /* get operation type */
759 if (linepos[0] == '=' && linepos[1] == '=') {
760 *op = OP_MATCH;
761 linepos += 2;
762 } else if (linepos[0] == '!' && linepos[1] == '=') {
763 *op = OP_NOMATCH;
764 linepos += 2;
765 } else if (linepos[0] == '+' && linepos[1] == '=') {
766 *op = OP_ADD;
767 linepos += 2;
768 } else if (linepos[0] == '-' && linepos[1] == '=') {
769 *op = OP_REMOVE;
770 linepos += 2;
771 } else if (linepos[0] == '=') {
772 *op = OP_ASSIGN;
773 linepos++;
774 } else if (linepos[0] == ':' && linepos[1] == '=') {
775 *op = OP_ASSIGN_FINAL;
776 linepos += 2;
777 } else
778 return -1;
779
780 /* terminate key */
781 temp[0] = '\0';
782
783 /* skip whitespace after operator */
784 while (isspace(linepos[0]))
785 linepos++;
786 if (linepos[0] == '\0')
787 return -1;
788
789 /* get the value */
790 if (linepos[0] == '"')
791 linepos++;
792 else
793 return -1;
794 *value = linepos;
795
796 /* terminate */
797 temp = strchr(linepos, '"');
798 if (!temp)
799 return -1;
800 temp[0] = '\0';
801 temp++;
802
803 /* move line to next key */
804 *line = temp;
805 return 0;
806 }
807
808 /* extract possible KEY{attr} */
809 static const char *get_key_attribute(struct udev *udev, char *str) {
810 char *pos;
811 char *attr;
812
813 attr = strchr(str, '{');
814 if (attr != NULL) {
815 attr++;
816 pos = strchr(attr, '}');
817 if (pos == NULL) {
818 log_error("missing closing brace for format");
819 return NULL;
820 }
821 pos[0] = '\0';
822 return attr;
823 }
824 return NULL;
825 }
826
827 static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
828 enum operation_type op,
829 const char *value, const void *data) {
830 struct token *token = &rule_tmp->token[rule_tmp->token_cur];
831 const char *attr = NULL;
832
833 memzero(token, sizeof(struct token));
834
835 switch (type) {
836 case TK_M_ACTION:
837 case TK_M_DEVPATH:
838 case TK_M_KERNEL:
839 case TK_M_SUBSYSTEM:
840 case TK_M_DRIVER:
841 case TK_M_WAITFOR:
842 case TK_M_DEVLINK:
843 case TK_M_NAME:
844 case TK_M_KERNELS:
845 case TK_M_SUBSYSTEMS:
846 case TK_M_DRIVERS:
847 case TK_M_TAGS:
848 case TK_M_PROGRAM:
849 case TK_M_IMPORT_FILE:
850 case TK_M_IMPORT_PROG:
851 case TK_M_IMPORT_DB:
852 case TK_M_IMPORT_CMDLINE:
853 case TK_M_IMPORT_PARENT:
854 case TK_M_RESULT:
855 case TK_A_OWNER:
856 case TK_A_GROUP:
857 case TK_A_MODE:
858 case TK_A_DEVLINK:
859 case TK_A_NAME:
860 case TK_A_GOTO:
861 case TK_M_TAG:
862 case TK_A_TAG:
863 case TK_A_STATIC_NODE:
864 token->key.value_off = rules_add_string(rule_tmp->rules, value);
865 break;
866 case TK_M_IMPORT_BUILTIN:
867 token->key.value_off = rules_add_string(rule_tmp->rules, value);
868 token->key.builtin_cmd = *(enum udev_builtin_cmd *)data;
869 break;
870 case TK_M_ENV:
871 case TK_M_ATTR:
872 case TK_M_SYSCTL:
873 case TK_M_ATTRS:
874 case TK_A_ATTR:
875 case TK_A_SYSCTL:
876 case TK_A_ENV:
877 case TK_A_SECLABEL:
878 attr = data;
879 token->key.value_off = rules_add_string(rule_tmp->rules, value);
880 token->key.attr_off = rules_add_string(rule_tmp->rules, attr);
881 break;
882 case TK_M_TEST:
883 token->key.value_off = rules_add_string(rule_tmp->rules, value);
884 if (data != NULL)
885 token->key.mode = *(mode_t *)data;
886 break;
887 case TK_A_STRING_ESCAPE_NONE:
888 case TK_A_STRING_ESCAPE_REPLACE:
889 case TK_A_DB_PERSIST:
890 break;
891 case TK_A_RUN_BUILTIN:
892 case TK_A_RUN_PROGRAM:
893 token->key.builtin_cmd = *(enum udev_builtin_cmd *)data;
894 token->key.value_off = rules_add_string(rule_tmp->rules, value);
895 break;
896 case TK_A_INOTIFY_WATCH:
897 case TK_A_DEVLINK_PRIO:
898 token->key.devlink_prio = *(int *)data;
899 break;
900 case TK_A_OWNER_ID:
901 token->key.uid = *(uid_t *)data;
902 break;
903 case TK_A_GROUP_ID:
904 token->key.gid = *(gid_t *)data;
905 break;
906 case TK_A_MODE_ID:
907 token->key.mode = *(mode_t *)data;
908 break;
909 case TK_RULE:
910 case TK_M_PARENTS_MIN:
911 case TK_M_PARENTS_MAX:
912 case TK_M_MAX:
913 case TK_END:
914 case TK_UNSET:
915 log_error("wrong type %u", type);
916 return -1;
917 }
918
919 if (value != NULL && type < TK_M_MAX) {
920 /* check if we need to split or call fnmatch() while matching rules */
921 enum string_glob_type glob;
922 int has_split;
923 int has_glob;
924
925 has_split = (strchr(value, '|') != NULL);
926 has_glob = string_is_glob(value);
927 if (has_split && has_glob) {
928 glob = GL_SPLIT_GLOB;
929 } else if (has_split) {
930 glob = GL_SPLIT;
931 } else if (has_glob) {
932 if (streq(value, "?*"))
933 glob = GL_SOMETHING;
934 else
935 glob = GL_GLOB;
936 } else {
937 glob = GL_PLAIN;
938 }
939 token->key.glob = glob;
940 }
941
942 if (value != NULL && type > TK_M_MAX) {
943 /* check if assigned value has substitution chars */
944 if (value[0] == '[')
945 token->key.subst = SB_SUBSYS;
946 else if (strchr(value, '%') != NULL || strchr(value, '$') != NULL)
947 token->key.subst = SB_FORMAT;
948 else
949 token->key.subst = SB_NONE;
950 }
951
952 if (attr != NULL) {
953 /* check if property/attribute name has substitution chars */
954 if (attr[0] == '[')
955 token->key.attrsubst = SB_SUBSYS;
956 else if (strchr(attr, '%') != NULL || strchr(attr, '$') != NULL)
957 token->key.attrsubst = SB_FORMAT;
958 else
959 token->key.attrsubst = SB_NONE;
960 }
961
962 token->key.type = type;
963 token->key.op = op;
964 rule_tmp->token_cur++;
965 if (rule_tmp->token_cur >= ELEMENTSOF(rule_tmp->token)) {
966 log_error("temporary rule array too small");
967 return -1;
968 }
969 return 0;
970 }
971
972 static int sort_token(struct udev_rules *rules, struct rule_tmp *rule_tmp) {
973 unsigned int i;
974 unsigned int start = 0;
975 unsigned int end = rule_tmp->token_cur;
976
977 for (i = 0; i < rule_tmp->token_cur; i++) {
978 enum token_type next_val = TK_UNSET;
979 unsigned int next_idx = 0;
980 unsigned int j;
981
982 /* find smallest value */
983 for (j = start; j < end; j++) {
984 if (rule_tmp->token[j].type == TK_UNSET)
985 continue;
986 if (next_val == TK_UNSET || rule_tmp->token[j].type < next_val) {
987 next_val = rule_tmp->token[j].type;
988 next_idx = j;
989 }
990 }
991
992 /* add token and mark done */
993 if (add_token(rules, &rule_tmp->token[next_idx]) != 0)
994 return -1;
995 rule_tmp->token[next_idx].type = TK_UNSET;
996
997 /* shrink range */
998 if (next_idx == start)
999 start++;
1000 if (next_idx+1 == end)
1001 end--;
1002 }
1003 return 0;
1004 }
1005
1006 static int add_rule(struct udev_rules *rules, char *line,
1007 const char *filename, unsigned int filename_off, unsigned int lineno) {
1008 char *linepos;
1009 const char *attr;
1010 struct rule_tmp rule_tmp = {
1011 .rules = rules,
1012 .rule.type = TK_RULE,
1013 };
1014
1015 /* the offset in the rule is limited to unsigned short */
1016 if (filename_off < USHRT_MAX)
1017 rule_tmp.rule.rule.filename_off = filename_off;
1018 rule_tmp.rule.rule.filename_line = lineno;
1019
1020 linepos = line;
1021 for (;;) {
1022 char *key;
1023 char *value;
1024 enum operation_type op;
1025
1026 if (get_key(rules->udev, &linepos, &key, &op, &value) != 0) {
1027 /* Avoid erroring on trailing whitespace. This is probably rare
1028 * so save the work for the error case instead of always trying
1029 * to strip the trailing whitespace with strstrip(). */
1030 while (isblank(*linepos))
1031 linepos++;
1032
1033 /* If we aren't at the end of the line, this is a parsing error.
1034 * Make a best effort to describe where the problem is. */
1035 if (!strchr(NEWLINE, *linepos)) {
1036 char buf[2] = {*linepos};
1037 _cleanup_free_ char *tmp;
1038
1039 tmp = cescape(buf);
1040 log_error("invalid key/value pair in file %s on line %u, starting at character %tu ('%s')",
1041 filename, lineno, linepos - line + 1, tmp);
1042 if (*linepos == '#')
1043 log_error("hint: comments can only start at beginning of line");
1044 }
1045 break;
1046 }
1047
1048 if (streq(key, "ACTION")) {
1049 if (op > OP_MATCH_MAX) {
1050 log_error("invalid ACTION operation");
1051 goto invalid;
1052 }
1053 rule_add_key(&rule_tmp, TK_M_ACTION, op, value, NULL);
1054 continue;
1055 }
1056
1057 if (streq(key, "DEVPATH")) {
1058 if (op > OP_MATCH_MAX) {
1059 log_error("invalid DEVPATH operation");
1060 goto invalid;
1061 }
1062 rule_add_key(&rule_tmp, TK_M_DEVPATH, op, value, NULL);
1063 continue;
1064 }
1065
1066 if (streq(key, "KERNEL")) {
1067 if (op > OP_MATCH_MAX) {
1068 log_error("invalid KERNEL operation");
1069 goto invalid;
1070 }
1071 rule_add_key(&rule_tmp, TK_M_KERNEL, op, value, NULL);
1072 continue;
1073 }
1074
1075 if (streq(key, "SUBSYSTEM")) {
1076 if (op > OP_MATCH_MAX) {
1077 log_error("invalid SUBSYSTEM operation");
1078 goto invalid;
1079 }
1080 /* bus, class, subsystem events should all be the same */
1081 if (streq(value, "subsystem") ||
1082 streq(value, "bus") ||
1083 streq(value, "class")) {
1084 if (streq(value, "bus") || streq(value, "class"))
1085 log_error("'%s' must be specified as 'subsystem' "
1086 "please fix it in %s:%u", value, filename, lineno);
1087 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, "subsystem|class|bus", NULL);
1088 } else
1089 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, value, NULL);
1090 continue;
1091 }
1092
1093 if (streq(key, "DRIVER")) {
1094 if (op > OP_MATCH_MAX) {
1095 log_error("invalid DRIVER operation");
1096 goto invalid;
1097 }
1098 rule_add_key(&rule_tmp, TK_M_DRIVER, op, value, NULL);
1099 continue;
1100 }
1101
1102 if (startswith(key, "ATTR{")) {
1103 attr = get_key_attribute(rules->udev, key + strlen("ATTR"));
1104 if (attr == NULL) {
1105 log_error("error parsing ATTR attribute");
1106 goto invalid;
1107 }
1108 if (op == OP_REMOVE) {
1109 log_error("invalid ATTR operation");
1110 goto invalid;
1111 }
1112 if (op < OP_MATCH_MAX)
1113 rule_add_key(&rule_tmp, TK_M_ATTR, op, value, attr);
1114 else
1115 rule_add_key(&rule_tmp, TK_A_ATTR, op, value, attr);
1116 continue;
1117 }
1118
1119 if (startswith(key, "SYSCTL{")) {
1120 attr = get_key_attribute(rules->udev, key + strlen("SYSCTL"));
1121 if (attr == NULL) {
1122 log_error("error parsing SYSCTL attribute");
1123 goto invalid;
1124 }
1125 if (op == OP_REMOVE) {
1126 log_error("invalid SYSCTL operation");
1127 goto invalid;
1128 }
1129 if (op < OP_MATCH_MAX)
1130 rule_add_key(&rule_tmp, TK_M_SYSCTL, op, value, attr);
1131 else
1132 rule_add_key(&rule_tmp, TK_A_SYSCTL, op, value, attr);
1133 continue;
1134 }
1135
1136 if (startswith(key, "SECLABEL{")) {
1137 attr = get_key_attribute(rules->udev, key + strlen("SECLABEL"));
1138 if (!attr) {
1139 log_error("error parsing SECLABEL attribute");
1140 goto invalid;
1141 }
1142 if (op == OP_REMOVE) {
1143 log_error("invalid SECLABEL operation");
1144 goto invalid;
1145 }
1146
1147 rule_add_key(&rule_tmp, TK_A_SECLABEL, op, value, attr);
1148 continue;
1149 }
1150
1151 if (streq(key, "KERNELS")) {
1152 if (op > OP_MATCH_MAX) {
1153 log_error("invalid KERNELS operation");
1154 goto invalid;
1155 }
1156 rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1157 continue;
1158 }
1159
1160 if (streq(key, "SUBSYSTEMS")) {
1161 if (op > OP_MATCH_MAX) {
1162 log_error("invalid SUBSYSTEMS operation");
1163 goto invalid;
1164 }
1165 rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1166 continue;
1167 }
1168
1169 if (streq(key, "DRIVERS")) {
1170 if (op > OP_MATCH_MAX) {
1171 log_error("invalid DRIVERS operation");
1172 goto invalid;
1173 }
1174 rule_add_key(&rule_tmp, TK_M_DRIVERS, op, value, NULL);
1175 continue;
1176 }
1177
1178 if (startswith(key, "ATTRS{")) {
1179 if (op > OP_MATCH_MAX) {
1180 log_error("invalid ATTRS operation");
1181 goto invalid;
1182 }
1183 attr = get_key_attribute(rules->udev, key + strlen("ATTRS"));
1184 if (attr == NULL) {
1185 log_error("error parsing ATTRS attribute");
1186 goto invalid;
1187 }
1188 if (startswith(attr, "device/"))
1189 log_error("the 'device' link may not be available in a future kernel, "
1190 "please fix it in %s:%u", filename, lineno);
1191 else if (strstr(attr, "../") != NULL)
1192 log_error("do not reference parent sysfs directories directly, "
1193 "it may break with a future kernel, please fix it in %s:%u", filename, lineno);
1194 rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1195 continue;
1196 }
1197
1198 if (streq(key, "TAGS")) {
1199 if (op > OP_MATCH_MAX) {
1200 log_error("invalid TAGS operation");
1201 goto invalid;
1202 }
1203 rule_add_key(&rule_tmp, TK_M_TAGS, op, value, NULL);
1204 continue;
1205 }
1206
1207 if (startswith(key, "ENV{")) {
1208 attr = get_key_attribute(rules->udev, key + strlen("ENV"));
1209 if (attr == NULL) {
1210 log_error("error parsing ENV attribute");
1211 goto invalid;
1212 }
1213 if (op == OP_REMOVE) {
1214 log_error("invalid ENV operation");
1215 goto invalid;
1216 }
1217 if (op < OP_MATCH_MAX) {
1218 if (rule_add_key(&rule_tmp, TK_M_ENV, op, value, attr) != 0)
1219 goto invalid;
1220 } else {
1221 static const char *blacklist[] = {
1222 "ACTION",
1223 "SUBSYSTEM",
1224 "DEVTYPE",
1225 "MAJOR",
1226 "MINOR",
1227 "DRIVER",
1228 "IFINDEX",
1229 "DEVNAME",
1230 "DEVLINKS",
1231 "DEVPATH",
1232 "TAGS",
1233 };
1234 unsigned int i;
1235
1236 for (i = 0; i < ELEMENTSOF(blacklist); i++) {
1237 if (!streq(attr, blacklist[i]))
1238 continue;
1239 log_error("invalid ENV attribute, '%s' can not be set %s:%u", attr, filename, lineno);
1240 goto invalid;
1241 }
1242 if (rule_add_key(&rule_tmp, TK_A_ENV, op, value, attr) != 0)
1243 goto invalid;
1244 }
1245 continue;
1246 }
1247
1248 if (streq(key, "TAG")) {
1249 if (op < OP_MATCH_MAX)
1250 rule_add_key(&rule_tmp, TK_M_TAG, op, value, NULL);
1251 else
1252 rule_add_key(&rule_tmp, TK_A_TAG, op, value, NULL);
1253 continue;
1254 }
1255
1256 if (streq(key, "PROGRAM")) {
1257 if (op == OP_REMOVE) {
1258 log_error("invalid PROGRAM operation");
1259 goto invalid;
1260 }
1261 rule_add_key(&rule_tmp, TK_M_PROGRAM, op, value, NULL);
1262 continue;
1263 }
1264
1265 if (streq(key, "RESULT")) {
1266 if (op > OP_MATCH_MAX) {
1267 log_error("invalid RESULT operation");
1268 goto invalid;
1269 }
1270 rule_add_key(&rule_tmp, TK_M_RESULT, op, value, NULL);
1271 continue;
1272 }
1273
1274 if (startswith(key, "IMPORT")) {
1275 attr = get_key_attribute(rules->udev, key + strlen("IMPORT"));
1276 if (attr == NULL) {
1277 log_error("IMPORT{} type missing, ignoring IMPORT %s:%u", filename, lineno);
1278 continue;
1279 }
1280 if (op == OP_REMOVE) {
1281 log_error("invalid IMPORT operation");
1282 goto invalid;
1283 }
1284 if (streq(attr, "program")) {
1285 /* find known built-in command */
1286 if (value[0] != '/') {
1287 enum udev_builtin_cmd cmd;
1288
1289 cmd = udev_builtin_lookup(value);
1290 if (cmd < UDEV_BUILTIN_MAX) {
1291 log_debug("IMPORT found builtin '%s', replacing %s:%u",
1292 value, filename, lineno);
1293 rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, value, &cmd);
1294 continue;
1295 }
1296 }
1297 rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1298 } else if (streq(attr, "builtin")) {
1299 enum udev_builtin_cmd cmd = udev_builtin_lookup(value);
1300
1301 if (cmd < UDEV_BUILTIN_MAX)
1302 rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, value, &cmd);
1303 else
1304 log_error("IMPORT{builtin}: '%s' unknown %s:%u", value, filename, lineno);
1305 } else if (streq(attr, "file")) {
1306 rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1307 } else if (streq(attr, "db")) {
1308 rule_add_key(&rule_tmp, TK_M_IMPORT_DB, op, value, NULL);
1309 } else if (streq(attr, "cmdline")) {
1310 rule_add_key(&rule_tmp, TK_M_IMPORT_CMDLINE, op, value, NULL);
1311 } else if (streq(attr, "parent")) {
1312 rule_add_key(&rule_tmp, TK_M_IMPORT_PARENT, op, value, NULL);
1313 } else
1314 log_error("IMPORT{} unknown type, ignoring IMPORT %s:%u", filename, lineno);
1315 continue;
1316 }
1317
1318 if (startswith(key, "TEST")) {
1319 mode_t mode = 0;
1320
1321 if (op > OP_MATCH_MAX) {
1322 log_error("invalid TEST operation");
1323 goto invalid;
1324 }
1325 attr = get_key_attribute(rules->udev, key + strlen("TEST"));
1326 if (attr != NULL) {
1327 mode = strtol(attr, NULL, 8);
1328 rule_add_key(&rule_tmp, TK_M_TEST, op, value, &mode);
1329 } else {
1330 rule_add_key(&rule_tmp, TK_M_TEST, op, value, NULL);
1331 }
1332 continue;
1333 }
1334
1335 if (startswith(key, "RUN")) {
1336 attr = get_key_attribute(rules->udev, key + strlen("RUN"));
1337 if (attr == NULL)
1338 attr = "program";
1339 if (op == OP_REMOVE) {
1340 log_error("invalid RUN operation");
1341 goto invalid;
1342 }
1343
1344 if (streq(attr, "builtin")) {
1345 enum udev_builtin_cmd cmd = udev_builtin_lookup(value);
1346
1347 if (cmd < UDEV_BUILTIN_MAX)
1348 rule_add_key(&rule_tmp, TK_A_RUN_BUILTIN, op, value, &cmd);
1349 else
1350 log_error("RUN{builtin}: '%s' unknown %s:%u", value, filename, lineno);
1351 } else if (streq(attr, "program")) {
1352 enum udev_builtin_cmd cmd = UDEV_BUILTIN_MAX;
1353
1354 rule_add_key(&rule_tmp, TK_A_RUN_PROGRAM, op, value, &cmd);
1355 } else {
1356 log_error("RUN{} unknown type, ignoring RUN %s:%u", filename, lineno);
1357 }
1358
1359 continue;
1360 }
1361
1362 if (streq(key, "LABEL")) {
1363 if (op == OP_REMOVE) {
1364 log_error("invalid LABEL operation");
1365 goto invalid;
1366 }
1367 rule_tmp.rule.rule.label_off = rules_add_string(rules, value);
1368 continue;
1369 }
1370
1371 if (streq(key, "GOTO")) {
1372 if (op == OP_REMOVE) {
1373 log_error("invalid GOTO operation");
1374 goto invalid;
1375 }
1376 rule_add_key(&rule_tmp, TK_A_GOTO, 0, value, NULL);
1377 continue;
1378 }
1379
1380 if (startswith(key, "NAME")) {
1381 if (op == OP_REMOVE) {
1382 log_error("invalid NAME operation");
1383 goto invalid;
1384 }
1385 if (op < OP_MATCH_MAX) {
1386 rule_add_key(&rule_tmp, TK_M_NAME, op, value, NULL);
1387 } else {
1388 if (streq(value, "%k")) {
1389 log_error("NAME=\"%%k\" is ignored, because it breaks kernel supplied names, "
1390 "please remove it from %s:%u\n", filename, lineno);
1391 continue;
1392 }
1393 if (value[0] == '\0') {
1394 log_debug("NAME=\"\" is ignored, because udev will not delete any device nodes, "
1395 "please remove it from %s:%u\n", filename, lineno);
1396 continue;
1397 }
1398 rule_add_key(&rule_tmp, TK_A_NAME, op, value, NULL);
1399 }
1400 rule_tmp.rule.rule.can_set_name = true;
1401 continue;
1402 }
1403
1404 if (streq(key, "SYMLINK")) {
1405 if (op == OP_REMOVE) {
1406 log_error("invalid SYMLINK operation");
1407 goto invalid;
1408 }
1409 if (op < OP_MATCH_MAX)
1410 rule_add_key(&rule_tmp, TK_M_DEVLINK, op, value, NULL);
1411 else
1412 rule_add_key(&rule_tmp, TK_A_DEVLINK, op, value, NULL);
1413 rule_tmp.rule.rule.can_set_name = true;
1414 continue;
1415 }
1416
1417 if (streq(key, "OWNER")) {
1418 uid_t uid;
1419 char *endptr;
1420
1421 if (op == OP_REMOVE) {
1422 log_error("invalid OWNER operation");
1423 goto invalid;
1424 }
1425
1426 uid = strtoul(value, &endptr, 10);
1427 if (endptr[0] == '\0') {
1428 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1429 } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1430 uid = add_uid(rules, value);
1431 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1432 } else if (rules->resolve_names >= 0) {
1433 rule_add_key(&rule_tmp, TK_A_OWNER, op, value, NULL);
1434 }
1435 rule_tmp.rule.rule.can_set_name = true;
1436 continue;
1437 }
1438
1439 if (streq(key, "GROUP")) {
1440 gid_t gid;
1441 char *endptr;
1442
1443 if (op == OP_REMOVE) {
1444 log_error("invalid GROUP operation");
1445 goto invalid;
1446 }
1447
1448 gid = strtoul(value, &endptr, 10);
1449 if (endptr[0] == '\0') {
1450 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1451 } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1452 gid = add_gid(rules, value);
1453 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1454 } else if (rules->resolve_names >= 0) {
1455 rule_add_key(&rule_tmp, TK_A_GROUP, op, value, NULL);
1456 }
1457 rule_tmp.rule.rule.can_set_name = true;
1458 continue;
1459 }
1460
1461 if (streq(key, "MODE")) {
1462 mode_t mode;
1463 char *endptr;
1464
1465 if (op == OP_REMOVE) {
1466 log_error("invalid MODE operation");
1467 goto invalid;
1468 }
1469
1470 mode = strtol(value, &endptr, 8);
1471 if (endptr[0] == '\0')
1472 rule_add_key(&rule_tmp, TK_A_MODE_ID, op, NULL, &mode);
1473 else
1474 rule_add_key(&rule_tmp, TK_A_MODE, op, value, NULL);
1475 rule_tmp.rule.rule.can_set_name = true;
1476 continue;
1477 }
1478
1479 if (streq(key, "OPTIONS")) {
1480 const char *pos;
1481
1482 if (op == OP_REMOVE) {
1483 log_error("invalid OPTIONS operation");
1484 goto invalid;
1485 }
1486
1487 pos = strstr(value, "link_priority=");
1488 if (pos != NULL) {
1489 int prio = atoi(&pos[strlen("link_priority=")]);
1490
1491 rule_add_key(&rule_tmp, TK_A_DEVLINK_PRIO, op, NULL, &prio);
1492 }
1493
1494 pos = strstr(value, "string_escape=");
1495 if (pos != NULL) {
1496 pos = &pos[strlen("string_escape=")];
1497 if (startswith(pos, "none"))
1498 rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_NONE, op, NULL, NULL);
1499 else if (startswith(pos, "replace"))
1500 rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_REPLACE, op, NULL, NULL);
1501 }
1502
1503 pos = strstr(value, "db_persist");
1504 if (pos != NULL)
1505 rule_add_key(&rule_tmp, TK_A_DB_PERSIST, op, NULL, NULL);
1506
1507 pos = strstr(value, "nowatch");
1508 if (pos != NULL) {
1509 const int off = 0;
1510
1511 rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &off);
1512 } else {
1513 pos = strstr(value, "watch");
1514 if (pos != NULL) {
1515 const int on = 1;
1516
1517 rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &on);
1518 }
1519 }
1520
1521 pos = strstr(value, "static_node=");
1522 if (pos != NULL) {
1523 rule_add_key(&rule_tmp, TK_A_STATIC_NODE, op, &pos[strlen("static_node=")], NULL);
1524 rule_tmp.rule.rule.has_static_node = true;
1525 }
1526
1527 continue;
1528 }
1529
1530 log_error("unknown key '%s' in %s:%u", key, filename, lineno);
1531 goto invalid;
1532 }
1533
1534 /* add rule token */
1535 rule_tmp.rule.rule.token_count = 1 + rule_tmp.token_cur;
1536 if (add_token(rules, &rule_tmp.rule) != 0)
1537 goto invalid;
1538
1539 /* add tokens to list, sorted by type */
1540 if (sort_token(rules, &rule_tmp) != 0)
1541 goto invalid;
1542
1543 return 0;
1544 invalid:
1545 log_error("invalid rule '%s:%u'", filename, lineno);
1546 return -1;
1547 }
1548
1549 static int parse_file(struct udev_rules *rules, const char *filename) {
1550 _cleanup_fclose_ FILE *f = NULL;
1551 unsigned int first_token;
1552 unsigned int filename_off;
1553 char line[UTIL_LINE_SIZE];
1554 int line_nr = 0;
1555 unsigned int i;
1556
1557 f = fopen(filename, "re");
1558 if (!f) {
1559 if (errno == ENOENT)
1560 return 0;
1561 else
1562 return -errno;
1563 }
1564
1565 if (null_or_empty_fd(fileno(f))) {
1566 log_debug("Skipping empty file: %s", filename);
1567 return 0;
1568 } else
1569 log_debug("Reading rules file: %s", filename);
1570
1571 first_token = rules->token_cur;
1572 filename_off = rules_add_string(rules, filename);
1573
1574 while (fgets(line, sizeof(line), f) != NULL) {
1575 char *key;
1576 size_t len;
1577
1578 /* skip whitespace */
1579 line_nr++;
1580 key = line;
1581 while (isspace(key[0]))
1582 key++;
1583
1584 /* comment */
1585 if (key[0] == '#')
1586 continue;
1587
1588 len = strlen(line);
1589 if (len < 3)
1590 continue;
1591
1592 /* continue reading if backslash+newline is found */
1593 while (line[len-2] == '\\') {
1594 if (fgets(&line[len-2], (sizeof(line)-len)+2, f) == NULL)
1595 break;
1596 if (strlen(&line[len-2]) < 2)
1597 break;
1598 line_nr++;
1599 len = strlen(line);
1600 }
1601
1602 if (len+1 >= sizeof(line)) {
1603 log_error("line too long '%s':%u, ignored", filename, line_nr);
1604 continue;
1605 }
1606 add_rule(rules, key, filename, filename_off, line_nr);
1607 }
1608
1609 /* link GOTOs to LABEL rules in this file to be able to fast-forward */
1610 for (i = first_token+1; i < rules->token_cur; i++) {
1611 if (rules->tokens[i].type == TK_A_GOTO) {
1612 char *label = rules_str(rules, rules->tokens[i].key.value_off);
1613 unsigned int j;
1614
1615 for (j = i+1; j < rules->token_cur; j++) {
1616 if (rules->tokens[j].type != TK_RULE)
1617 continue;
1618 if (rules->tokens[j].rule.label_off == 0)
1619 continue;
1620 if (!streq(label, rules_str(rules, rules->tokens[j].rule.label_off)))
1621 continue;
1622 rules->tokens[i].key.rule_goto = j;
1623 break;
1624 }
1625 if (rules->tokens[i].key.rule_goto == 0)
1626 log_error("GOTO '%s' has no matching label in: '%s'", label, filename);
1627 }
1628 }
1629 return 0;
1630 }
1631
1632 struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names) {
1633 struct udev_rules *rules;
1634 struct udev_list file_list;
1635 struct token end_token;
1636 char **files, **f;
1637 int r;
1638
1639 rules = new0(struct udev_rules, 1);
1640 if (rules == NULL)
1641 return NULL;
1642 rules->udev = udev;
1643 rules->resolve_names = resolve_names;
1644 udev_list_init(udev, &file_list, true);
1645
1646 /* init token array and string buffer */
1647 rules->tokens = malloc(PREALLOC_TOKEN * sizeof(struct token));
1648 if (rules->tokens == NULL)
1649 return udev_rules_unref(rules);
1650 rules->token_max = PREALLOC_TOKEN;
1651
1652 rules->strbuf = strbuf_new();
1653 if (!rules->strbuf)
1654 return udev_rules_unref(rules);
1655
1656 udev_rules_check_timestamp(rules);
1657
1658 r = conf_files_list_strv(&files, ".rules", NULL, rules_dirs);
1659 if (r < 0) {
1660 log_error_errno(r, "failed to enumerate rules files: %m");
1661 return udev_rules_unref(rules);
1662 }
1663
1664 /*
1665 * The offset value in the rules strct is limited; add all
1666 * rules file names to the beginning of the string buffer.
1667 */
1668 STRV_FOREACH(f, files)
1669 rules_add_string(rules, *f);
1670
1671 STRV_FOREACH(f, files)
1672 parse_file(rules, *f);
1673
1674 strv_free(files);
1675
1676 memzero(&end_token, sizeof(struct token));
1677 end_token.type = TK_END;
1678 add_token(rules, &end_token);
1679 log_debug("rules contain %zu bytes tokens (%u * %zu bytes), %zu bytes strings",
1680 rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->strbuf->len);
1681
1682 /* cleanup temporary strbuf data */
1683 log_debug("%zu strings (%zu bytes), %zu de-duplicated (%zu bytes), %zu trie nodes used",
1684 rules->strbuf->in_count, rules->strbuf->in_len,
1685 rules->strbuf->dedup_count, rules->strbuf->dedup_len, rules->strbuf->nodes_count);
1686 strbuf_complete(rules->strbuf);
1687
1688 /* cleanup uid/gid cache */
1689 free(rules->uids);
1690 rules->uids = NULL;
1691 rules->uids_cur = 0;
1692 rules->uids_max = 0;
1693 free(rules->gids);
1694 rules->gids = NULL;
1695 rules->gids_cur = 0;
1696 rules->gids_max = 0;
1697
1698 dump_rules(rules);
1699 return rules;
1700 }
1701
1702 struct udev_rules *udev_rules_unref(struct udev_rules *rules) {
1703 if (rules == NULL)
1704 return NULL;
1705 free(rules->tokens);
1706 strbuf_cleanup(rules->strbuf);
1707 free(rules->uids);
1708 free(rules->gids);
1709 free(rules);
1710 return NULL;
1711 }
1712
1713 bool udev_rules_check_timestamp(struct udev_rules *rules) {
1714 if (!rules)
1715 return false;
1716
1717 return paths_check_timestamp(rules_dirs, &rules->dirs_ts_usec, true);
1718 }
1719
1720 static int match_key(struct udev_rules *rules, struct token *token, const char *val) {
1721 char *key_value = rules_str(rules, token->key.value_off);
1722 char *pos;
1723 bool match = false;
1724
1725 if (val == NULL)
1726 val = "";
1727
1728 switch (token->key.glob) {
1729 case GL_PLAIN:
1730 match = (streq(key_value, val));
1731 break;
1732 case GL_GLOB:
1733 match = (fnmatch(key_value, val, 0) == 0);
1734 break;
1735 case GL_SPLIT:
1736 {
1737 const char *s;
1738 size_t len;
1739
1740 s = rules_str(rules, token->key.value_off);
1741 len = strlen(val);
1742 for (;;) {
1743 const char *next;
1744
1745 next = strchr(s, '|');
1746 if (next != NULL) {
1747 size_t matchlen = (size_t)(next - s);
1748
1749 match = (matchlen == len && strneq(s, val, matchlen));
1750 if (match)
1751 break;
1752 } else {
1753 match = (streq(s, val));
1754 break;
1755 }
1756 s = &next[1];
1757 }
1758 break;
1759 }
1760 case GL_SPLIT_GLOB:
1761 {
1762 char value[UTIL_PATH_SIZE];
1763
1764 strscpy(value, sizeof(value), rules_str(rules, token->key.value_off));
1765 key_value = value;
1766 while (key_value != NULL) {
1767 pos = strchr(key_value, '|');
1768 if (pos != NULL) {
1769 pos[0] = '\0';
1770 pos = &pos[1];
1771 }
1772 match = (fnmatch(key_value, val, 0) == 0);
1773 if (match)
1774 break;
1775 key_value = pos;
1776 }
1777 break;
1778 }
1779 case GL_SOMETHING:
1780 match = (val[0] != '\0');
1781 break;
1782 case GL_UNSET:
1783 return -1;
1784 }
1785
1786 if (match && (token->key.op == OP_MATCH))
1787 return 0;
1788 if (!match && (token->key.op == OP_NOMATCH))
1789 return 0;
1790 return -1;
1791 }
1792
1793 static int match_attr(struct udev_rules *rules, struct udev_device *dev, struct udev_event *event, struct token *cur) {
1794 const char *name;
1795 char nbuf[UTIL_NAME_SIZE];
1796 const char *value;
1797 char vbuf[UTIL_NAME_SIZE];
1798 size_t len;
1799
1800 name = rules_str(rules, cur->key.attr_off);
1801 switch (cur->key.attrsubst) {
1802 case SB_FORMAT:
1803 udev_event_apply_format(event, name, nbuf, sizeof(nbuf));
1804 name = nbuf;
1805 /* fall through */
1806 case SB_NONE:
1807 value = udev_device_get_sysattr_value(dev, name);
1808 if (value == NULL)
1809 return -1;
1810 break;
1811 case SB_SUBSYS:
1812 if (util_resolve_subsys_kernel(event->udev, name, vbuf, sizeof(vbuf), 1) != 0)
1813 return -1;
1814 value = vbuf;
1815 break;
1816 default:
1817 return -1;
1818 }
1819
1820 /* remove trailing whitespace, if not asked to match for it */
1821 len = strlen(value);
1822 if (len > 0 && isspace(value[len-1])) {
1823 const char *key_value;
1824 size_t klen;
1825
1826 key_value = rules_str(rules, cur->key.value_off);
1827 klen = strlen(key_value);
1828 if (klen > 0 && !isspace(key_value[klen-1])) {
1829 if (value != vbuf) {
1830 strscpy(vbuf, sizeof(vbuf), value);
1831 value = vbuf;
1832 }
1833 while (len > 0 && isspace(vbuf[--len]))
1834 vbuf[len] = '\0';
1835 }
1836 }
1837
1838 return match_key(rules, cur, value);
1839 }
1840
1841 enum escape_type {
1842 ESCAPE_UNSET,
1843 ESCAPE_NONE,
1844 ESCAPE_REPLACE,
1845 };
1846
1847 int udev_rules_apply_to_event(struct udev_rules *rules,
1848 struct udev_event *event,
1849 usec_t timeout_usec,
1850 usec_t timeout_warn_usec,
1851 struct udev_list *properties_list) {
1852 struct token *cur;
1853 struct token *rule;
1854 enum escape_type esc = ESCAPE_UNSET;
1855 bool can_set_name;
1856
1857 if (rules->tokens == NULL)
1858 return -1;
1859
1860 can_set_name = ((!streq(udev_device_get_action(event->dev), "remove")) &&
1861 (major(udev_device_get_devnum(event->dev)) > 0 ||
1862 udev_device_get_ifindex(event->dev) > 0));
1863
1864 /* loop through token list, match, run actions or forward to next rule */
1865 cur = &rules->tokens[0];
1866 rule = cur;
1867 for (;;) {
1868 dump_token(rules, cur);
1869 switch (cur->type) {
1870 case TK_RULE:
1871 /* current rule */
1872 rule = cur;
1873 /* possibly skip rules which want to set NAME, SYMLINK, OWNER, GROUP, MODE */
1874 if (!can_set_name && rule->rule.can_set_name)
1875 goto nomatch;
1876 esc = ESCAPE_UNSET;
1877 break;
1878 case TK_M_ACTION:
1879 if (match_key(rules, cur, udev_device_get_action(event->dev)) != 0)
1880 goto nomatch;
1881 break;
1882 case TK_M_DEVPATH:
1883 if (match_key(rules, cur, udev_device_get_devpath(event->dev)) != 0)
1884 goto nomatch;
1885 break;
1886 case TK_M_KERNEL:
1887 if (match_key(rules, cur, udev_device_get_sysname(event->dev)) != 0)
1888 goto nomatch;
1889 break;
1890 case TK_M_DEVLINK: {
1891 struct udev_list_entry *list_entry;
1892 bool match = false;
1893
1894 udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(event->dev)) {
1895 const char *devlink;
1896
1897 devlink = udev_list_entry_get_name(list_entry) + strlen("/dev/");
1898 if (match_key(rules, cur, devlink) == 0) {
1899 match = true;
1900 break;
1901 }
1902 }
1903 if (!match)
1904 goto nomatch;
1905 break;
1906 }
1907 case TK_M_NAME:
1908 if (match_key(rules, cur, event->name) != 0)
1909 goto nomatch;
1910 break;
1911 case TK_M_ENV: {
1912 const char *key_name = rules_str(rules, cur->key.attr_off);
1913 const char *value;
1914
1915 value = udev_device_get_property_value(event->dev, key_name);
1916
1917 /* check global properties */
1918 if (!value && properties_list) {
1919 struct udev_list_entry *list_entry;
1920
1921 list_entry = udev_list_get_entry(properties_list);
1922 list_entry = udev_list_entry_get_by_name(list_entry, key_name);
1923 if (list_entry != NULL)
1924 value = udev_list_entry_get_value(list_entry);
1925 }
1926
1927 if (!value)
1928 value = "";
1929 if (match_key(rules, cur, value))
1930 goto nomatch;
1931 break;
1932 }
1933 case TK_M_TAG: {
1934 struct udev_list_entry *list_entry;
1935 bool match = false;
1936
1937 udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(event->dev)) {
1938 if (streq(rules_str(rules, cur->key.value_off), udev_list_entry_get_name(list_entry))) {
1939 match = true;
1940 break;
1941 }
1942 }
1943 if (!match && (cur->key.op != OP_NOMATCH))
1944 goto nomatch;
1945 break;
1946 }
1947 case TK_M_SUBSYSTEM:
1948 if (match_key(rules, cur, udev_device_get_subsystem(event->dev)) != 0)
1949 goto nomatch;
1950 break;
1951 case TK_M_DRIVER:
1952 if (match_key(rules, cur, udev_device_get_driver(event->dev)) != 0)
1953 goto nomatch;
1954 break;
1955 case TK_M_ATTR:
1956 if (match_attr(rules, event->dev, event, cur) != 0)
1957 goto nomatch;
1958 break;
1959 case TK_M_SYSCTL: {
1960 char filename[UTIL_PATH_SIZE];
1961 _cleanup_free_ char *value = NULL;
1962 size_t len;
1963
1964 udev_event_apply_format(event, rules_str(rules, cur->key.attr_off), filename, sizeof(filename));
1965 sysctl_normalize(filename);
1966 if (sysctl_read(filename, &value) < 0)
1967 goto nomatch;
1968
1969 len = strlen(value);
1970 while (len > 0 && isspace(value[--len]))
1971 value[len] = '\0';
1972 if (match_key(rules, cur, value) != 0)
1973 goto nomatch;
1974 break;
1975 }
1976 case TK_M_KERNELS:
1977 case TK_M_SUBSYSTEMS:
1978 case TK_M_DRIVERS:
1979 case TK_M_ATTRS:
1980 case TK_M_TAGS: {
1981 struct token *next;
1982
1983 /* get whole sequence of parent matches */
1984 next = cur;
1985 while (next->type > TK_M_PARENTS_MIN && next->type < TK_M_PARENTS_MAX)
1986 next++;
1987
1988 /* loop over parents */
1989 event->dev_parent = event->dev;
1990 for (;;) {
1991 struct token *key;
1992
1993 /* loop over sequence of parent match keys */
1994 for (key = cur; key < next; key++ ) {
1995 dump_token(rules, key);
1996 switch(key->type) {
1997 case TK_M_KERNELS:
1998 if (match_key(rules, key, udev_device_get_sysname(event->dev_parent)) != 0)
1999 goto try_parent;
2000 break;
2001 case TK_M_SUBSYSTEMS:
2002 if (match_key(rules, key, udev_device_get_subsystem(event->dev_parent)) != 0)
2003 goto try_parent;
2004 break;
2005 case TK_M_DRIVERS:
2006 if (match_key(rules, key, udev_device_get_driver(event->dev_parent)) != 0)
2007 goto try_parent;
2008 break;
2009 case TK_M_ATTRS:
2010 if (match_attr(rules, event->dev_parent, event, key) != 0)
2011 goto try_parent;
2012 break;
2013 case TK_M_TAGS: {
2014 bool match = udev_device_has_tag(event->dev_parent, rules_str(rules, cur->key.value_off));
2015
2016 if (match && key->key.op == OP_NOMATCH)
2017 goto try_parent;
2018 if (!match && key->key.op == OP_MATCH)
2019 goto try_parent;
2020 break;
2021 }
2022 default:
2023 goto nomatch;
2024 }
2025 }
2026 break;
2027
2028 try_parent:
2029 event->dev_parent = udev_device_get_parent(event->dev_parent);
2030 if (event->dev_parent == NULL)
2031 goto nomatch;
2032 }
2033 /* move behind our sequence of parent match keys */
2034 cur = next;
2035 continue;
2036 }
2037 case TK_M_TEST: {
2038 char filename[UTIL_PATH_SIZE];
2039 struct stat statbuf;
2040 int match;
2041
2042 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), filename, sizeof(filename));
2043 if (util_resolve_subsys_kernel(event->udev, filename, filename, sizeof(filename), 0) != 0) {
2044 if (filename[0] != '/') {
2045 char tmp[UTIL_PATH_SIZE];
2046
2047 strscpy(tmp, sizeof(tmp), filename);
2048 strscpyl(filename, sizeof(filename),
2049 udev_device_get_syspath(event->dev), "/", tmp, NULL);
2050 }
2051 }
2052 attr_subst_subdir(filename, sizeof(filename));
2053
2054 match = (stat(filename, &statbuf) == 0);
2055 if (match && cur->key.mode > 0)
2056 match = ((statbuf.st_mode & cur->key.mode) > 0);
2057 if (match && cur->key.op == OP_NOMATCH)
2058 goto nomatch;
2059 if (!match && cur->key.op == OP_MATCH)
2060 goto nomatch;
2061 break;
2062 }
2063 case TK_M_PROGRAM: {
2064 char program[UTIL_PATH_SIZE];
2065 char result[UTIL_LINE_SIZE];
2066
2067 free(event->program_result);
2068 event->program_result = NULL;
2069 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), program, sizeof(program));
2070 log_debug("PROGRAM '%s' %s:%u",
2071 program,
2072 rules_str(rules, rule->rule.filename_off),
2073 rule->rule.filename_line);
2074
2075 if (udev_event_spawn(event, timeout_usec, timeout_warn_usec, true, program, result, sizeof(result)) < 0) {
2076 if (cur->key.op != OP_NOMATCH)
2077 goto nomatch;
2078 } else {
2079 int count;
2080
2081 util_remove_trailing_chars(result, '\n');
2082 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2083 count = util_replace_chars(result, UDEV_ALLOWED_CHARS_INPUT);
2084 if (count > 0)
2085 log_debug("%i character(s) replaced" , count);
2086 }
2087 event->program_result = strdup(result);
2088 if (cur->key.op == OP_NOMATCH)
2089 goto nomatch;
2090 }
2091 break;
2092 }
2093 case TK_M_IMPORT_FILE: {
2094 char import[UTIL_PATH_SIZE];
2095
2096 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), import, sizeof(import));
2097 if (import_file_into_properties(event->dev, import) != 0)
2098 if (cur->key.op != OP_NOMATCH)
2099 goto nomatch;
2100 break;
2101 }
2102 case TK_M_IMPORT_PROG: {
2103 char import[UTIL_PATH_SIZE];
2104
2105 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), import, sizeof(import));
2106 log_debug("IMPORT '%s' %s:%u",
2107 import,
2108 rules_str(rules, rule->rule.filename_off),
2109 rule->rule.filename_line);
2110
2111 if (import_program_into_properties(event, timeout_usec, timeout_warn_usec, import) != 0)
2112 if (cur->key.op != OP_NOMATCH)
2113 goto nomatch;
2114 break;
2115 }
2116 case TK_M_IMPORT_BUILTIN: {
2117 char command[UTIL_PATH_SIZE];
2118
2119 if (udev_builtin_run_once(cur->key.builtin_cmd)) {
2120 /* check if we ran already */
2121 if (event->builtin_run & (1 << cur->key.builtin_cmd)) {
2122 log_debug("IMPORT builtin skip '%s' %s:%u",
2123 udev_builtin_name(cur->key.builtin_cmd),
2124 rules_str(rules, rule->rule.filename_off),
2125 rule->rule.filename_line);
2126 /* return the result from earlier run */
2127 if (event->builtin_ret & (1 << cur->key.builtin_cmd))
2128 if (cur->key.op != OP_NOMATCH)
2129 goto nomatch;
2130 break;
2131 }
2132 /* mark as ran */
2133 event->builtin_run |= (1 << cur->key.builtin_cmd);
2134 }
2135
2136 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), command, sizeof(command));
2137 log_debug("IMPORT builtin '%s' %s:%u",
2138 udev_builtin_name(cur->key.builtin_cmd),
2139 rules_str(rules, rule->rule.filename_off),
2140 rule->rule.filename_line);
2141
2142 if (udev_builtin_run(event->dev, cur->key.builtin_cmd, command, false) != 0) {
2143 /* remember failure */
2144 log_debug("IMPORT builtin '%s' returned non-zero",
2145 udev_builtin_name(cur->key.builtin_cmd));
2146 event->builtin_ret |= (1 << cur->key.builtin_cmd);
2147 if (cur->key.op != OP_NOMATCH)
2148 goto nomatch;
2149 }
2150 break;
2151 }
2152 case TK_M_IMPORT_DB: {
2153 const char *key = rules_str(rules, cur->key.value_off);
2154 const char *value;
2155
2156 value = udev_device_get_property_value(event->dev_db, key);
2157 if (value != NULL)
2158 udev_device_add_property(event->dev, key, value);
2159 else {
2160 if (cur->key.op != OP_NOMATCH)
2161 goto nomatch;
2162 }
2163 break;
2164 }
2165 case TK_M_IMPORT_CMDLINE: {
2166 FILE *f;
2167 bool imported = false;
2168
2169 f = fopen("/proc/cmdline", "re");
2170 if (f != NULL) {
2171 char cmdline[4096];
2172
2173 if (fgets(cmdline, sizeof(cmdline), f) != NULL) {
2174 const char *key = rules_str(rules, cur->key.value_off);
2175 char *pos;
2176
2177 pos = strstr(cmdline, key);
2178 if (pos != NULL) {
2179 pos += strlen(key);
2180 if (pos[0] == '\0' || isspace(pos[0])) {
2181 /* we import simple flags as 'FLAG=1' */
2182 udev_device_add_property(event->dev, key, "1");
2183 imported = true;
2184 } else if (pos[0] == '=') {
2185 const char *value;
2186
2187 pos++;
2188 value = pos;
2189 while (pos[0] != '\0' && !isspace(pos[0]))
2190 pos++;
2191 pos[0] = '\0';
2192 udev_device_add_property(event->dev, key, value);
2193 imported = true;
2194 }
2195 }
2196 }
2197 fclose(f);
2198 }
2199 if (!imported && cur->key.op != OP_NOMATCH)
2200 goto nomatch;
2201 break;
2202 }
2203 case TK_M_IMPORT_PARENT: {
2204 char import[UTIL_PATH_SIZE];
2205
2206 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), import, sizeof(import));
2207 if (import_parent_into_properties(event->dev, import) != 0)
2208 if (cur->key.op != OP_NOMATCH)
2209 goto nomatch;
2210 break;
2211 }
2212 case TK_M_RESULT:
2213 if (match_key(rules, cur, event->program_result) != 0)
2214 goto nomatch;
2215 break;
2216 case TK_A_STRING_ESCAPE_NONE:
2217 esc = ESCAPE_NONE;
2218 break;
2219 case TK_A_STRING_ESCAPE_REPLACE:
2220 esc = ESCAPE_REPLACE;
2221 break;
2222 case TK_A_DB_PERSIST:
2223 udev_device_set_db_persist(event->dev);
2224 break;
2225 case TK_A_INOTIFY_WATCH:
2226 if (event->inotify_watch_final)
2227 break;
2228 if (cur->key.op == OP_ASSIGN_FINAL)
2229 event->inotify_watch_final = true;
2230 event->inotify_watch = cur->key.watch;
2231 break;
2232 case TK_A_DEVLINK_PRIO:
2233 udev_device_set_devlink_priority(event->dev, cur->key.devlink_prio);
2234 break;
2235 case TK_A_OWNER: {
2236 char owner[UTIL_NAME_SIZE];
2237 const char *ow = owner;
2238 int r;
2239
2240 if (event->owner_final)
2241 break;
2242 if (cur->key.op == OP_ASSIGN_FINAL)
2243 event->owner_final = true;
2244 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), owner, sizeof(owner));
2245 event->owner_set = true;
2246 r = get_user_creds(&ow, &event->uid, NULL, NULL, NULL);
2247 if (r < 0) {
2248 if (r == -ENOENT || r == -ESRCH)
2249 log_error("specified user '%s' unknown", owner);
2250 else
2251 log_error_errno(r, "error resolving user '%s': %m", owner);
2252
2253 event->uid = 0;
2254 }
2255 log_debug("OWNER %u %s:%u",
2256 event->uid,
2257 rules_str(rules, rule->rule.filename_off),
2258 rule->rule.filename_line);
2259 break;
2260 }
2261 case TK_A_GROUP: {
2262 char group[UTIL_NAME_SIZE];
2263 const char *gr = group;
2264 int r;
2265
2266 if (event->group_final)
2267 break;
2268 if (cur->key.op == OP_ASSIGN_FINAL)
2269 event->group_final = true;
2270 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), group, sizeof(group));
2271 event->group_set = true;
2272 r = get_group_creds(&gr, &event->gid);
2273 if (r < 0) {
2274 if (r == -ENOENT || r == -ESRCH)
2275 log_error("specified group '%s' unknown", group);
2276 else
2277 log_error_errno(r, "error resolving group '%s': %m", group);
2278
2279 event->gid = 0;
2280 }
2281 log_debug("GROUP %u %s:%u",
2282 event->gid,
2283 rules_str(rules, rule->rule.filename_off),
2284 rule->rule.filename_line);
2285 break;
2286 }
2287 case TK_A_MODE: {
2288 char mode_str[UTIL_NAME_SIZE];
2289 mode_t mode;
2290 char *endptr;
2291
2292 if (event->mode_final)
2293 break;
2294 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), mode_str, sizeof(mode_str));
2295 mode = strtol(mode_str, &endptr, 8);
2296 if (endptr[0] != '\0') {
2297 log_error("ignoring invalid mode '%s'", mode_str);
2298 break;
2299 }
2300 if (cur->key.op == OP_ASSIGN_FINAL)
2301 event->mode_final = true;
2302 event->mode_set = true;
2303 event->mode = mode;
2304 log_debug("MODE %#o %s:%u",
2305 event->mode,
2306 rules_str(rules, rule->rule.filename_off),
2307 rule->rule.filename_line);
2308 break;
2309 }
2310 case TK_A_OWNER_ID:
2311 if (event->owner_final)
2312 break;
2313 if (cur->key.op == OP_ASSIGN_FINAL)
2314 event->owner_final = true;
2315 event->owner_set = true;
2316 event->uid = cur->key.uid;
2317 log_debug("OWNER %u %s:%u",
2318 event->uid,
2319 rules_str(rules, rule->rule.filename_off),
2320 rule->rule.filename_line);
2321 break;
2322 case TK_A_GROUP_ID:
2323 if (event->group_final)
2324 break;
2325 if (cur->key.op == OP_ASSIGN_FINAL)
2326 event->group_final = true;
2327 event->group_set = true;
2328 event->gid = cur->key.gid;
2329 log_debug("GROUP %u %s:%u",
2330 event->gid,
2331 rules_str(rules, rule->rule.filename_off),
2332 rule->rule.filename_line);
2333 break;
2334 case TK_A_MODE_ID:
2335 if (event->mode_final)
2336 break;
2337 if (cur->key.op == OP_ASSIGN_FINAL)
2338 event->mode_final = true;
2339 event->mode_set = true;
2340 event->mode = cur->key.mode;
2341 log_debug("MODE %#o %s:%u",
2342 event->mode,
2343 rules_str(rules, rule->rule.filename_off),
2344 rule->rule.filename_line);
2345 break;
2346 case TK_A_SECLABEL: {
2347 const char *name, *label;
2348
2349 name = rules_str(rules, cur->key.attr_off);
2350 label = rules_str(rules, cur->key.value_off);
2351 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2352 udev_list_cleanup(&event->seclabel_list);
2353 udev_list_entry_add(&event->seclabel_list, name, label);
2354 log_debug("SECLABEL{%s}='%s' %s:%u",
2355 name, label,
2356 rules_str(rules, rule->rule.filename_off),
2357 rule->rule.filename_line);
2358 break;
2359 }
2360 case TK_A_ENV: {
2361 const char *name = rules_str(rules, cur->key.attr_off);
2362 char *value = rules_str(rules, cur->key.value_off);
2363 char value_new[UTIL_NAME_SIZE];
2364 const char *value_old = NULL;
2365
2366 if (value[0] == '\0') {
2367 if (cur->key.op == OP_ADD)
2368 break;
2369 udev_device_add_property(event->dev, name, NULL);
2370 break;
2371 }
2372
2373 if (cur->key.op == OP_ADD)
2374 value_old = udev_device_get_property_value(event->dev, name);
2375 if (value_old) {
2376 char temp[UTIL_NAME_SIZE];
2377
2378 /* append value separated by space */
2379 udev_event_apply_format(event, value, temp, sizeof(temp));
2380 strscpyl(value_new, sizeof(value_new), value_old, " ", temp, NULL);
2381 } else
2382 udev_event_apply_format(event, value, value_new, sizeof(value_new));
2383
2384 udev_device_add_property(event->dev, name, value_new);
2385 break;
2386 }
2387 case TK_A_TAG: {
2388 char tag[UTIL_PATH_SIZE];
2389 const char *p;
2390
2391 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), tag, sizeof(tag));
2392 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2393 udev_device_cleanup_tags_list(event->dev);
2394 for (p = tag; *p != '\0'; p++) {
2395 if ((*p >= 'a' && *p <= 'z') ||
2396 (*p >= 'A' && *p <= 'Z') ||
2397 (*p >= '0' && *p <= '9') ||
2398 *p == '-' || *p == '_')
2399 continue;
2400 log_error("ignoring invalid tag name '%s'", tag);
2401 break;
2402 }
2403 if (cur->key.op == OP_REMOVE)
2404 udev_device_remove_tag(event->dev, tag);
2405 else
2406 udev_device_add_tag(event->dev, tag);
2407 break;
2408 }
2409 case TK_A_NAME: {
2410 const char *name = rules_str(rules, cur->key.value_off);
2411
2412 char name_str[UTIL_PATH_SIZE];
2413 int count;
2414
2415 if (event->name_final)
2416 break;
2417 if (cur->key.op == OP_ASSIGN_FINAL)
2418 event->name_final = true;
2419 udev_event_apply_format(event, name, name_str, sizeof(name_str));
2420 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2421 count = util_replace_chars(name_str, "/");
2422 if (count > 0)
2423 log_debug("%i character(s) replaced", count);
2424 }
2425 if (major(udev_device_get_devnum(event->dev)) &&
2426 (!streq(name_str, udev_device_get_devnode(event->dev) + strlen("/dev/")))) {
2427 log_error("NAME=\"%s\" ignored, kernel device nodes "
2428 "can not be renamed; please fix it in %s:%u\n", name,
2429 rules_str(rules, rule->rule.filename_off), rule->rule.filename_line);
2430 break;
2431 }
2432 free(event->name);
2433 event->name = strdup(name_str);
2434 log_debug("NAME '%s' %s:%u",
2435 event->name,
2436 rules_str(rules, rule->rule.filename_off),
2437 rule->rule.filename_line);
2438 break;
2439 }
2440 case TK_A_DEVLINK: {
2441 char temp[UTIL_PATH_SIZE];
2442 char filename[UTIL_PATH_SIZE];
2443 char *pos, *next;
2444 int count = 0;
2445
2446 if (event->devlink_final)
2447 break;
2448 if (major(udev_device_get_devnum(event->dev)) == 0)
2449 break;
2450 if (cur->key.op == OP_ASSIGN_FINAL)
2451 event->devlink_final = true;
2452 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2453 udev_device_cleanup_devlinks_list(event->dev);
2454
2455 /* allow multiple symlinks separated by spaces */
2456 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), temp, sizeof(temp));
2457 if (esc == ESCAPE_UNSET)
2458 count = util_replace_chars(temp, "/ ");
2459 else if (esc == ESCAPE_REPLACE)
2460 count = util_replace_chars(temp, "/");
2461 if (count > 0)
2462 log_debug("%i character(s) replaced" , count);
2463 pos = temp;
2464 while (isspace(pos[0]))
2465 pos++;
2466 next = strchr(pos, ' ');
2467 while (next != NULL) {
2468 next[0] = '\0';
2469 log_debug("LINK '%s' %s:%u", pos,
2470 rules_str(rules, rule->rule.filename_off), rule->rule.filename_line);
2471 strscpyl(filename, sizeof(filename), "/dev/", pos, NULL);
2472 udev_device_add_devlink(event->dev, filename);
2473 while (isspace(next[1]))
2474 next++;
2475 pos = &next[1];
2476 next = strchr(pos, ' ');
2477 }
2478 if (pos[0] != '\0') {
2479 log_debug("LINK '%s' %s:%u", pos,
2480 rules_str(rules, rule->rule.filename_off), rule->rule.filename_line);
2481 strscpyl(filename, sizeof(filename), "/dev/", pos, NULL);
2482 udev_device_add_devlink(event->dev, filename);
2483 }
2484 break;
2485 }
2486 case TK_A_ATTR: {
2487 const char *key_name = rules_str(rules, cur->key.attr_off);
2488 char attr[UTIL_PATH_SIZE];
2489 char value[UTIL_NAME_SIZE];
2490 FILE *f;
2491
2492 if (util_resolve_subsys_kernel(event->udev, key_name, attr, sizeof(attr), 0) != 0)
2493 strscpyl(attr, sizeof(attr), udev_device_get_syspath(event->dev), "/", key_name, NULL);
2494 attr_subst_subdir(attr, sizeof(attr));
2495
2496 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), value, sizeof(value));
2497 log_debug("ATTR '%s' writing '%s' %s:%u", attr, value,
2498 rules_str(rules, rule->rule.filename_off),
2499 rule->rule.filename_line);
2500 f = fopen(attr, "we");
2501 if (f != NULL) {
2502 if (fprintf(f, "%s", value) <= 0)
2503 log_error_errno(errno, "error writing ATTR{%s}: %m", attr);
2504 fclose(f);
2505 } else {
2506 log_error_errno(errno, "error opening ATTR{%s} for writing: %m", attr);
2507 }
2508 break;
2509 }
2510 case TK_A_SYSCTL: {
2511 char filename[UTIL_PATH_SIZE];
2512 char value[UTIL_NAME_SIZE];
2513 int r;
2514
2515 udev_event_apply_format(event, rules_str(rules, cur->key.attr_off), filename, sizeof(filename));
2516 sysctl_normalize(filename);
2517 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), value, sizeof(value));
2518 log_debug("SYSCTL '%s' writing '%s' %s:%u", filename, value,
2519 rules_str(rules, rule->rule.filename_off), rule->rule.filename_line);
2520 r = sysctl_write(filename, value);
2521 if (r < 0)
2522 log_error("error writing SYSCTL{%s}='%s': %s", filename, value, strerror(-r));
2523 break;
2524 }
2525 case TK_A_RUN_BUILTIN:
2526 case TK_A_RUN_PROGRAM: {
2527 struct udev_list_entry *entry;
2528
2529 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2530 udev_list_cleanup(&event->run_list);
2531 log_debug("RUN '%s' %s:%u",
2532 rules_str(rules, cur->key.value_off),
2533 rules_str(rules, rule->rule.filename_off),
2534 rule->rule.filename_line);
2535 entry = udev_list_entry_add(&event->run_list, rules_str(rules, cur->key.value_off), NULL);
2536 udev_list_entry_set_num(entry, cur->key.builtin_cmd);
2537 break;
2538 }
2539 case TK_A_GOTO:
2540 if (cur->key.rule_goto == 0)
2541 break;
2542 cur = &rules->tokens[cur->key.rule_goto];
2543 continue;
2544 case TK_END:
2545 return 0;
2546
2547 case TK_M_PARENTS_MIN:
2548 case TK_M_PARENTS_MAX:
2549 case TK_M_MAX:
2550 case TK_UNSET:
2551 log_error("wrong type %u", cur->type);
2552 goto nomatch;
2553 }
2554
2555 cur++;
2556 continue;
2557 nomatch:
2558 /* fast-forward to next rule */
2559 cur = rule + rule->rule.token_count;
2560 }
2561 }
2562
2563 int udev_rules_apply_static_dev_perms(struct udev_rules *rules) {
2564 struct token *cur;
2565 struct token *rule;
2566 uid_t uid = 0;
2567 gid_t gid = 0;
2568 mode_t mode = 0;
2569 _cleanup_strv_free_ char **tags = NULL;
2570 char **t;
2571 FILE *f = NULL;
2572 _cleanup_free_ char *path = NULL;
2573 int r = 0;
2574
2575 if (rules->tokens == NULL)
2576 return 0;
2577
2578 cur = &rules->tokens[0];
2579 rule = cur;
2580 for (;;) {
2581 switch (cur->type) {
2582 case TK_RULE:
2583 /* current rule */
2584 rule = cur;
2585
2586 /* skip rules without a static_node tag */
2587 if (!rule->rule.has_static_node)
2588 goto next;
2589
2590 uid = 0;
2591 gid = 0;
2592 mode = 0;
2593 strv_free(tags);
2594 tags = NULL;
2595 break;
2596 case TK_A_OWNER_ID:
2597 uid = cur->key.uid;
2598 break;
2599 case TK_A_GROUP_ID:
2600 gid = cur->key.gid;
2601 break;
2602 case TK_A_MODE_ID:
2603 mode = cur->key.mode;
2604 break;
2605 case TK_A_TAG:
2606 r = strv_extend(&tags, rules_str(rules, cur->key.value_off));
2607 if (r < 0)
2608 goto finish;
2609
2610 break;
2611 case TK_A_STATIC_NODE: {
2612 char device_node[UTIL_PATH_SIZE];
2613 char tags_dir[UTIL_PATH_SIZE];
2614 char tag_symlink[UTIL_PATH_SIZE];
2615 struct stat stats;
2616
2617 /* we assure, that the permissions tokens are sorted before the static token */
2618
2619 if (mode == 0 && uid == 0 && gid == 0 && tags == NULL)
2620 goto next;
2621
2622 strscpyl(device_node, sizeof(device_node), "/dev/", rules_str(rules, cur->key.value_off), NULL);
2623 if (stat(device_node, &stats) != 0)
2624 break;
2625 if (!S_ISBLK(stats.st_mode) && !S_ISCHR(stats.st_mode))
2626 break;
2627
2628 /* export the tags to a directory as symlinks, allowing otherwise dead nodes to be tagged */
2629 if (tags) {
2630 STRV_FOREACH(t, tags) {
2631 _cleanup_free_ char *unescaped_filename = NULL;
2632
2633 strscpyl(tags_dir, sizeof(tags_dir), "/run/udev/static_node-tags/", *t, "/", NULL);
2634 r = mkdir_p(tags_dir, 0755);
2635 if (r < 0)
2636 return log_error_errno(r, "failed to create %s: %m", tags_dir);
2637
2638 unescaped_filename = xescape(rules_str(rules, cur->key.value_off), "/.");
2639
2640 strscpyl(tag_symlink, sizeof(tag_symlink), tags_dir, unescaped_filename, NULL);
2641 r = symlink(device_node, tag_symlink);
2642 if (r < 0 && errno != EEXIST)
2643 return log_error_errno(errno, "failed to create symlink %s -> %s: %m",
2644 tag_symlink, device_node);
2645 else
2646 r = 0;
2647 }
2648 }
2649
2650 /* don't touch the permissions if only the tags were set */
2651 if (mode == 0 && uid == 0 && gid == 0)
2652 break;
2653
2654 if (mode == 0) {
2655 if (gid > 0)
2656 mode = 0660;
2657 else
2658 mode = 0600;
2659 }
2660 if (mode != (stats.st_mode & 01777)) {
2661 r = chmod(device_node, mode);
2662 if (r < 0) {
2663 log_error("failed to chmod '%s' %#o", device_node, mode);
2664 return -errno;
2665 } else
2666 log_debug("chmod '%s' %#o", device_node, mode);
2667 }
2668
2669 if ((uid != 0 && uid != stats.st_uid) || (gid != 0 && gid != stats.st_gid)) {
2670 r = chown(device_node, uid, gid);
2671 if (r < 0) {
2672 log_error("failed to chown '%s' %u %u ", device_node, uid, gid);
2673 return -errno;
2674 } else
2675 log_debug("chown '%s' %u %u", device_node, uid, gid);
2676 }
2677
2678 utimensat(AT_FDCWD, device_node, NULL, 0);
2679 break;
2680 }
2681 case TK_END:
2682 goto finish;
2683 }
2684
2685 cur++;
2686 continue;
2687 next:
2688 /* fast-forward to next rule */
2689 cur = rule + rule->rule.token_count;
2690 continue;
2691 }
2692
2693 finish:
2694 if (f) {
2695 fflush(f);
2696 fchmod(fileno(f), 0644);
2697 if (ferror(f) || rename(path, "/run/udev/static_node-tags") < 0) {
2698 r = -errno;
2699 unlink("/run/udev/static_node-tags");
2700 unlink(path);
2701 }
2702 fclose(f);
2703 }
2704
2705 return r;
2706 }
Unnamed repository; edit this file 'description' to name the repository.