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[thirdparty/systemd.git] / udev / udev-rules.c
1 /*
2 * Copyright (C) 2008 Kay Sievers <kay.sievers@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 <stdlib.h>
20 #include <string.h>
21 #include <stdio.h>
22 #include <fcntl.h>
23 #include <ctype.h>
24 #include <unistd.h>
25 #include <errno.h>
26 #include <dirent.h>
27 #include <fnmatch.h>
28
29 #include "udev.h"
30
31 #define PREALLOC_TOKEN 2048
32 #define PREALLOC_STRBUF 32 * 1024
33
34 struct uid_gid {
35 unsigned int name_off;
36 union {
37 uid_t uid;
38 gid_t gid;
39 };
40 };
41
42 /* KEY=="", KEY!="", KEY+="", KEY="", KEY:="" */
43 struct udev_rules {
44 struct udev *udev;
45 int resolve_names;
46
47 /* every key in the rules file becomes a token */
48 struct token *tokens;
49 unsigned int token_cur;
50 unsigned int token_max;
51
52 /* all key strings are copied to a single string buffer */
53 char *buf;
54 size_t buf_cur;
55 size_t buf_max;
56 unsigned int buf_count;
57
58 /* during rule parsing, we cache uid/gid lookup results */
59 struct uid_gid *uids;
60 unsigned int uids_cur;
61 unsigned int uids_max;
62 struct uid_gid *gids;
63 unsigned int gids_cur;
64 unsigned int gids_max;
65 };
66
67 enum operation_type {
68 OP_UNSET,
69
70 OP_MATCH,
71 OP_NOMATCH,
72 OP_MATCH_MAX,
73
74 OP_ADD,
75 OP_ASSIGN,
76 OP_ASSIGN_FINAL,
77 };
78
79 enum string_glob_type {
80 GL_UNSET,
81 GL_PLAIN, /* no special chars */
82 GL_GLOB, /* shell globs ?,*,[] */
83 GL_SPLIT, /* multi-value A|B */
84 GL_SPLIT_GLOB, /* multi-value with glob A*|B* */
85 GL_SOMETHING, /* commonly used "?*" */
86 GL_FORMAT,
87 };
88
89 /* tokens of a rule are sorted/handled in this order */
90 enum token_type {
91 TK_UNSET,
92 TK_RULE,
93
94 TK_M_ACTION, /* val */
95 TK_M_DEVPATH, /* val */
96 TK_M_KERNEL, /* val */
97 TK_M_DEVLINK, /* val */
98 TK_M_NAME, /* val */
99 TK_M_ENV, /* val, attr */
100 TK_M_SUBSYSTEM, /* val */
101 TK_M_DRIVER, /* val */
102 TK_M_WAITFOR, /* val */
103 TK_M_ATTR, /* val, attr */
104
105 TK_M_PARENTS_MIN,
106 TK_M_KERNELS, /* val */
107 TK_M_SUBSYSTEMS, /* val */
108 TK_M_DRIVERS, /* val */
109 TK_M_ATTRS, /* val, attr */
110 TK_M_PARENTS_MAX,
111
112 TK_M_TEST, /* val, mode_t */
113 TK_M_PROGRAM, /* val */
114 TK_M_IMPORT_FILE, /* val */
115 TK_M_IMPORT_PROG, /* val */
116 TK_M_IMPORT_PARENT, /* val */
117 TK_M_RESULT, /* val */
118 TK_M_MAX,
119
120 TK_A_IGNORE_DEVICE,
121 TK_A_STRING_ESCAPE_NONE,
122 TK_A_STRING_ESCAPE_REPLACE,
123 TK_A_NUM_FAKE_PART, /* int */
124 TK_A_DEVLINK_PRIO, /* int */
125 TK_A_OWNER, /* val */
126 TK_A_GROUP, /* val */
127 TK_A_MODE, /* val */
128 TK_A_OWNER_ID, /* uid_t */
129 TK_A_GROUP_ID, /* gid_t */
130 TK_A_MODE_ID, /* mode_t */
131 TK_A_ENV, /* val, attr */
132 TK_A_NAME, /* val */
133 TK_A_DEVLINK, /* val */
134 TK_A_EVENT_TIMEOUT, /* int */
135 TK_A_IGNORE_REMOVE,
136 TK_A_ATTR, /* val, attr */
137 TK_A_RUN, /* val, bool */
138 TK_A_GOTO, /* size_t */
139 TK_A_LAST_RULE,
140
141 TK_END,
142 };
143
144 /* we try to pack stuff in a way that we take only 16 bytes per token */
145 struct token {
146 union {
147 unsigned short type; /* same as in rule and key */
148 struct {
149 unsigned short type;
150 unsigned short flags;
151 unsigned int next_rule;
152 unsigned int label_off;
153 unsigned short filename_off;
154 unsigned short filename_line;
155 } rule;
156 struct {
157 unsigned short type;
158 unsigned short flags;
159 unsigned short op;
160 unsigned short glob;
161 unsigned int value_off;
162 union {
163 unsigned int attr_off;
164 int ignore_error;
165 int i;
166 unsigned int rule_goto;
167 mode_t mode;
168 uid_t uid;
169 gid_t gid;
170 int num_fake_part;
171 int devlink_prio;
172 int event_timeout;
173 };
174 } key;
175 };
176 };
177
178 #define MAX_TK 64
179 struct rule_tmp {
180 struct udev_rules *rules;
181 struct token rule;
182 struct token token[MAX_TK];
183 unsigned int token_cur;
184 };
185
186 #ifdef DEBUG
187 static const char *operation_str[] = {
188 [OP_UNSET] = "UNSET",
189 [OP_MATCH] = "match",
190 [OP_NOMATCH] = "nomatch",
191 [OP_MATCH_MAX] = "MATCH_MAX",
192
193 [OP_ADD] = "add",
194 [OP_ASSIGN] = "assign",
195 [OP_ASSIGN_FINAL] = "assign-final",
196 };
197
198 static const char *string_glob_str[] = {
199 [GL_UNSET] = "UNSET",
200 [GL_PLAIN] = "plain",
201 [GL_GLOB] = "glob",
202 [GL_SPLIT] = "split",
203 [GL_SPLIT_GLOB] = "split-glob",
204 [GL_SOMETHING] = "split-glob",
205 [GL_FORMAT] = "format",
206 };
207
208 static const char *token_str[] = {
209 [TK_UNSET] = "UNSET",
210 [TK_RULE] = "RULE",
211
212 [TK_M_ACTION] = "M ACTION",
213 [TK_M_DEVPATH] = "M DEVPATH",
214 [TK_M_KERNEL] = "M KERNEL",
215 [TK_M_DEVLINK] = "M DEVLINK",
216 [TK_M_NAME] = "M NAME",
217 [TK_M_ENV] = "M ENV",
218 [TK_M_SUBSYSTEM] = "M SUBSYSTEM",
219 [TK_M_DRIVER] = "M DRIVER",
220 [TK_M_WAITFOR] = "M WAITFOR",
221 [TK_M_ATTR] = "M ATTR",
222
223 [TK_M_PARENTS_MIN] = "M PARENTS_MIN",
224 [TK_M_KERNELS] = "M KERNELS",
225 [TK_M_SUBSYSTEMS] = "M SUBSYSTEMS",
226 [TK_M_DRIVERS] = "M DRIVERS",
227 [TK_M_ATTRS] = "M ATTRS",
228 [TK_M_PARENTS_MAX] = "M PARENTS_MAX",
229
230 [TK_M_TEST] = "M TEST",
231 [TK_M_PROGRAM] = "M PROGRAM",
232 [TK_M_IMPORT_FILE] = "M IMPORT_FILE",
233 [TK_M_IMPORT_PROG] = "M IMPORT_PROG",
234 [TK_M_IMPORT_PARENT] = "M MPORT_PARENT",
235 [TK_M_RESULT] = "M RESULT",
236 [TK_M_MAX] = "M MAX",
237
238 [TK_A_IGNORE_DEVICE] = "A IGNORE_DEVICE",
239 [TK_A_STRING_ESCAPE_NONE] = "A STRING_ESCAPE_NONE",
240 [TK_A_STRING_ESCAPE_REPLACE] = "A STRING_ESCAPE_REPLACE",
241 [TK_A_NUM_FAKE_PART] = "A NUM_FAKE_PART",
242 [TK_A_DEVLINK_PRIO] = "A DEVLINK_PRIO",
243 [TK_A_OWNER] = "A OWNER",
244 [TK_A_GROUP] = "A GROUP",
245 [TK_A_MODE] = "A MODE",
246 [TK_A_OWNER_ID] = "A OWNER_ID",
247 [TK_A_GROUP_ID] = "A GROUP_ID",
248 [TK_A_MODE_ID] = "A MODE_ID",
249 [TK_A_ENV] = "A ENV",
250 [TK_A_NAME] = "A NAME",
251 [TK_A_DEVLINK] = "A DEVLINK",
252 [TK_A_EVENT_TIMEOUT] = "A EVENT_TIMEOUT",
253 [TK_A_IGNORE_REMOVE] = "A IGNORE_REMOVE",
254 [TK_A_ATTR] = "A ATTR",
255 [TK_A_RUN] = "A RUN",
256 [TK_A_GOTO] = "A GOTO",
257 [TK_A_LAST_RULE] = "A LAST_RULE",
258
259 [TK_END] = "END",
260 };
261
262 static void dump_token(struct udev_rules *rules, struct token *token)
263 {
264 enum token_type type = token->type;
265 enum operation_type op = token->key.op;
266 enum string_glob_type glob = token->key.glob;
267 const char *value = &rules->buf[token->key.value_off];
268 const char *attr = &rules->buf[token->key.attr_off];
269
270 switch (type) {
271 case TK_RULE:
272 {
273 const char *tks_ptr = (char *)rules->tokens;
274 const char *tk_ptr = (char *)token;
275 unsigned int off = tk_ptr - tks_ptr;
276
277 dbg(rules->udev, "* RULE %s:%u, off: %u(%u), next: %u, label: '%s', flags: 0x%02x\n",
278 &rules->buf[token->rule.filename_off], token->rule.filename_line,
279 off / (unsigned int) sizeof(struct token), off,
280 token->rule.next_rule,
281 &rules->buf[token->rule.label_off],
282 token->rule.flags);
283 break;
284 }
285 case TK_M_ACTION:
286 case TK_M_DEVPATH:
287 case TK_M_KERNEL:
288 case TK_M_SUBSYSTEM:
289 case TK_M_DRIVER:
290 case TK_M_WAITFOR:
291 case TK_M_DEVLINK:
292 case TK_M_NAME:
293 case TK_M_KERNELS:
294 case TK_M_SUBSYSTEMS:
295 case TK_M_DRIVERS:
296 case TK_M_PROGRAM:
297 case TK_M_IMPORT_FILE:
298 case TK_M_IMPORT_PROG:
299 case TK_M_IMPORT_PARENT:
300 case TK_M_RESULT:
301 case TK_A_NAME:
302 case TK_A_DEVLINK:
303 case TK_A_OWNER:
304 case TK_A_GROUP:
305 case TK_A_MODE:
306 case TK_A_RUN:
307 dbg(rules->udev, "%s %s '%s'(%s)\n",
308 token_str[type], operation_str[op], value, string_glob_str[glob]);
309 break;
310 case TK_M_ATTR:
311 case TK_M_ATTRS:
312 case TK_M_ENV:
313 case TK_A_ATTR:
314 case TK_A_ENV:
315 dbg(rules->udev, "%s %s '%s' '%s'(%s)\n",
316 token_str[type], operation_str[op], attr, value, string_glob_str[glob]);
317 break;
318 case TK_A_IGNORE_DEVICE:
319 case TK_A_STRING_ESCAPE_NONE:
320 case TK_A_STRING_ESCAPE_REPLACE:
321 case TK_A_LAST_RULE:
322 case TK_A_IGNORE_REMOVE:
323 dbg(rules->udev, "%s\n", token_str[type]);
324 break;
325 case TK_M_TEST:
326 dbg(rules->udev, "%s %s '%s'(%s) %#o\n",
327 token_str[type], operation_str[op], value, string_glob_str[glob], token->key.mode);
328 break;
329 case TK_A_NUM_FAKE_PART:
330 dbg(rules->udev, "%s %u\n", token_str[type], token->key.num_fake_part);
331 break;
332 case TK_A_DEVLINK_PRIO:
333 dbg(rules->udev, "%s %s %u\n", token_str[type], operation_str[op], token->key.devlink_prio);
334 break;
335 case TK_A_OWNER_ID:
336 dbg(rules->udev, "%s %s %u\n", token_str[type], operation_str[op], token->key.uid);
337 break;
338 case TK_A_GROUP_ID:
339 dbg(rules->udev, "%s %s %u\n", token_str[type], operation_str[op], token->key.gid);
340 break;
341 case TK_A_MODE_ID:
342 dbg(rules->udev, "%s %s %#o\n", token_str[type], operation_str[op], token->key.mode);
343 break;
344 case TK_A_EVENT_TIMEOUT:
345 dbg(rules->udev, "%s %s %u\n", token_str[type], operation_str[op], token->key.event_timeout);
346 break;
347 case TK_A_GOTO:
348 dbg(rules->udev, "%s '%s' %u\n", token_str[type], value, token->key.rule_goto);
349 break;
350 case TK_END:
351 dbg(rules->udev, "* %s\n", token_str[type]);
352 break;
353 case TK_M_PARENTS_MIN:
354 case TK_M_PARENTS_MAX:
355 case TK_M_MAX:
356 case TK_UNSET:
357 dbg(rules->udev, "unknown type %u\n", type);
358 break;
359 }
360 }
361
362 static void dump_rules(struct udev_rules *rules)
363 {
364 unsigned int i;
365
366 dbg(rules->udev, "dumping %u (%zu bytes) tokens, %u (%zu bytes) strings\n",
367 rules->token_cur,
368 rules->token_cur * sizeof(struct token),
369 rules->buf_count,
370 rules->buf_cur);
371 for(i = 0; i < rules->token_cur; i++)
372 dump_token(rules, &rules->tokens[i]);
373 }
374 #else
375 static const char **operation_str;
376 static const char **token_str;
377 static inline void dump_token(struct udev_rules *rules, struct token *token) {}
378 static inline void dump_rules(struct udev_rules *rules) {}
379 #endif /* DEBUG */
380
381 /* we could lookup and return existing strings, or tails of strings */
382 static int add_string(struct udev_rules *rules, const char *str)
383 {
384 size_t len = strlen(str)+1;
385 int off;
386
387 /* offset 0 is always '\0' */
388 if (str[0] == '\0')
389 return 0;
390
391 /* grow buffer if needed */
392 if (rules->buf_cur + len+1 >= rules->buf_max) {
393 char *buf;
394 unsigned int add;
395
396 /* double the buffer size */
397 add = rules->buf_max;
398 if (add < len * 8)
399 add = len * 8;
400
401 buf = realloc(rules->buf, rules->buf_max + add);
402 if (buf == NULL)
403 return -1;
404 dbg(rules->udev, "extend buffer from %zu to %zu\n", rules->buf_max, rules->buf_max + add);
405 rules->buf = buf;
406 rules->buf_max += add;
407 }
408 off = rules->buf_cur;
409 memcpy(&rules->buf[rules->buf_cur], str, len);
410 rules->buf_cur += len;
411 rules->buf_count++;
412 return off;
413 }
414
415 static int add_token(struct udev_rules *rules, struct token *token)
416 {
417
418 /* grow buffer if needed */
419 if (rules->token_cur+1 >= rules->token_max) {
420 struct token *tokens;
421 unsigned int add;
422
423 /* double the buffer size */
424 add = rules->token_max;
425 if (add < 8)
426 add = 8;
427
428 tokens = realloc(rules->tokens, (rules->token_max + add ) * sizeof(struct token));
429 if (tokens == NULL)
430 return -1;
431 dbg(rules->udev, "extend tokens from %u to %u\n", rules->token_max, rules->token_max + add);
432 rules->tokens = tokens;
433 rules->token_max += add;
434 }
435 memcpy(&rules->tokens[rules->token_cur], token, sizeof(struct token));
436 rules->token_cur++;
437 return 0;
438 }
439
440 static uid_t add_uid(struct udev_rules *rules, const char *owner)
441 {
442 unsigned int i;
443 uid_t uid;
444 unsigned int off;
445
446 /* lookup, if we know it already */
447 for (i = 0; i < rules->uids_cur; i++) {
448 off = rules->uids[i].name_off;
449 if (strcmp(&rules->buf[off], owner) == 0) {
450 uid = rules->uids[i].uid;
451 dbg(rules->udev, "return existing %u for '%s'\n", uid, owner);
452 return uid;
453 }
454 }
455 uid = util_lookup_user(rules->udev, owner);
456
457 /* grow buffer if needed */
458 if (rules->uids_cur+1 >= rules->uids_max) {
459 struct uid_gid *uids;
460 unsigned int add;
461
462 /* double the buffer size */
463 add = rules->uids_max;
464 if (add < 1)
465 add = 8;
466
467 uids = realloc(rules->uids, (rules->uids_max + add ) * sizeof(struct uid_gid));
468 if (uids == NULL)
469 return uid;
470 dbg(rules->udev, "extend uids from %u to %u\n", rules->uids_max, rules->uids_max + add);
471 rules->uids = uids;
472 rules->uids_max += add;
473 }
474 rules->uids[rules->uids_cur].uid = uid;
475 off = add_string(rules, owner);
476 if (off <= 0)
477 return uid;
478 rules->uids[rules->uids_cur].name_off = off;
479 rules->uids_cur++;
480 return uid;
481 }
482
483 static gid_t add_gid(struct udev_rules *rules, const char *group)
484 {
485 unsigned int i;
486 gid_t gid;
487 unsigned int off;
488
489 /* lookup, if we know it already */
490 for (i = 0; i < rules->gids_cur; i++) {
491 off = rules->gids[i].name_off;
492 if (strcmp(&rules->buf[off], group) == 0) {
493 gid = rules->gids[i].gid;
494 dbg(rules->udev, "return existing %u for '%s'\n", gid, group);
495 return gid;
496 }
497 }
498 gid = util_lookup_group(rules->udev, group);
499
500 /* grow buffer if needed */
501 if (rules->gids_cur+1 >= rules->gids_max) {
502 struct uid_gid *gids;
503 unsigned int add;
504
505 /* double the buffer size */
506 add = rules->gids_max;
507 if (add < 1)
508 add = 8;
509
510 gids = realloc(rules->gids, (rules->gids_max + add ) * sizeof(struct uid_gid));
511 if (gids == NULL)
512 return gid;
513 dbg(rules->udev, "extend gids from %u to %u\n", rules->gids_max, rules->gids_max + add);
514 rules->gids = gids;
515 rules->gids_max += add;
516 }
517 rules->gids[rules->gids_cur].gid = gid;
518 off = add_string(rules, group);
519 if (off <= 0)
520 return gid;
521 rules->gids[rules->gids_cur].name_off = off;
522 rules->gids_cur++;
523 return gid;
524 }
525
526 static int import_property_from_string(struct udev_device *dev, char *line)
527 {
528 struct udev *udev = udev_device_get_udev(dev);
529 char *key;
530 char *val;
531 size_t len;
532
533 /* find key */
534 key = line;
535 while (isspace(key[0]))
536 key++;
537
538 /* comment or empty line */
539 if (key[0] == '#' || key[0] == '\0')
540 return -1;
541
542 /* split key/value */
543 val = strchr(key, '=');
544 if (val == NULL)
545 return -1;
546 val[0] = '\0';
547 val++;
548
549 /* find value */
550 while (isspace(val[0]))
551 val++;
552
553 /* terminate key */
554 len = strlen(key);
555 if (len == 0)
556 return -1;
557 while (isspace(key[len-1]))
558 len--;
559 key[len] = '\0';
560
561 /* terminate value */
562 len = strlen(val);
563 if (len == 0)
564 return -1;
565 while (isspace(val[len-1]))
566 len--;
567 val[len] = '\0';
568
569 if (len == 0)
570 return -1;
571
572 /* unquote */
573 if (val[0] == '"' || val[0] == '\'') {
574 if (val[len-1] != val[0]) {
575 info(udev, "inconsistent quoting: '%s', skip\n", line);
576 return -1;
577 }
578 val[len-1] = '\0';
579 val++;
580 }
581
582 dbg(udev, "adding '%s'='%s'\n", key, val);
583
584 /* handle device, renamed by external tool, returning new path */
585 if (strcmp(key, "DEVPATH") == 0) {
586 char syspath[UTIL_PATH_SIZE];
587
588 info(udev, "updating devpath from '%s' to '%s'\n",
589 udev_device_get_devpath(dev), val);
590 util_strlcpy(syspath, udev_get_sys_path(udev), sizeof(syspath));
591 util_strlcat(syspath, val, sizeof(syspath));
592 udev_device_set_syspath(dev, syspath);
593 } else {
594 struct udev_list_entry *entry;
595
596 entry = udev_device_add_property(dev, key, val);
597 /* store in db */
598 udev_list_entry_set_flag(entry, 1);
599 }
600 return 0;
601 }
602
603 static int import_file_into_properties(struct udev_device *dev, const char *filename)
604 {
605 FILE *f;
606 char line[UTIL_LINE_SIZE];
607
608 f = fopen(filename, "r");
609 if (f == NULL)
610 return -1;
611 while (fgets(line, sizeof(line), f) != NULL)
612 import_property_from_string(dev, line);
613 fclose(f);
614 return 0;
615 }
616
617 static int import_program_into_properties(struct udev_device *dev, const char *program)
618 {
619 struct udev *udev = udev_device_get_udev(dev);
620 char **envp;
621 char result[2048];
622 size_t reslen;
623 char *line;
624
625 envp = udev_device_get_properties_envp(dev);
626 if (util_run_program(udev, program, envp, result, sizeof(result), &reslen) != 0)
627 return -1;
628
629 line = result;
630 while (line != NULL) {
631 char *pos;
632
633 pos = strchr(line, '\n');
634 if (pos != NULL) {
635 pos[0] = '\0';
636 pos = &pos[1];
637 }
638 import_property_from_string(dev, line);
639 line = pos;
640 }
641 return 0;
642 }
643
644 static int import_parent_into_properties(struct udev_device *dev, const char *filter)
645 {
646 struct udev *udev = udev_device_get_udev(dev);
647 struct udev_device *dev_parent;
648 struct udev_list_entry *list_entry;
649
650 dev_parent = udev_device_get_parent(dev);
651 if (dev_parent == NULL)
652 return -1;
653
654 dbg(udev, "found parent '%s', get the node name\n", udev_device_get_syspath(dev_parent));
655 udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(dev_parent)) {
656 const char *key = udev_list_entry_get_name(list_entry);
657 const char *val = udev_list_entry_get_value(list_entry);
658
659 if (fnmatch(filter, key, 0) == 0) {
660 struct udev_list_entry *entry;
661
662 dbg(udev, "import key '%s=%s'\n", key, val);
663 entry = udev_device_add_property(dev, key, val);
664 /* store in db */
665 udev_list_entry_set_flag(entry, 1);
666 }
667 }
668 return 0;
669 }
670
671 #define WAIT_LOOP_PER_SECOND 50
672 static int wait_for_file(struct udev_device *dev, const char *file, int timeout)
673 {
674 struct udev *udev = udev_device_get_udev(dev);
675 char filepath[UTIL_PATH_SIZE];
676 char devicepath[UTIL_PATH_SIZE];
677 struct stat stats;
678 int loop = timeout * WAIT_LOOP_PER_SECOND;
679
680 /* a relative path is a device attribute */
681 devicepath[0] = '\0';
682 if (file[0] != '/') {
683 util_strlcpy(devicepath, udev_get_sys_path(udev), sizeof(devicepath));
684 util_strlcat(devicepath, udev_device_get_devpath(dev), sizeof(devicepath));
685
686 util_strlcpy(filepath, devicepath, sizeof(filepath));
687 util_strlcat(filepath, "/", sizeof(filepath));
688 util_strlcat(filepath, file, sizeof(filepath));
689 file = filepath;
690 }
691
692 dbg(udev, "will wait %i sec for '%s'\n", timeout, file);
693 while (--loop) {
694 /* lookup file */
695 if (stat(file, &stats) == 0) {
696 info(udev, "file '%s' appeared after %i loops\n", file, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
697 return 0;
698 }
699 /* make sure, the device did not disappear in the meantime */
700 if (devicepath[0] != '\0' && stat(devicepath, &stats) != 0) {
701 info(udev, "device disappeared while waiting for '%s'\n", file);
702 return -2;
703 }
704 info(udev, "wait for '%s' for %i mseconds\n", file, 1000 / WAIT_LOOP_PER_SECOND);
705 usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
706 }
707 info(udev, "waiting for '%s' failed\n", file);
708 return -1;
709 }
710
711 static int attr_subst_subdir(char *attr, size_t len)
712 {
713 char *pos;
714 int found = 0;
715
716 pos = strstr(attr, "/*/");
717 if (pos != NULL) {
718 char str[UTIL_PATH_SIZE];
719 DIR *dir;
720
721 pos[1] = '\0';
722 util_strlcpy(str, &pos[2], sizeof(str));
723 dir = opendir(attr);
724 if (dir != NULL) {
725 struct dirent *dent;
726
727 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
728 struct stat stats;
729
730 if (dent->d_name[0] == '.')
731 continue;
732 util_strlcat(attr, dent->d_name, len);
733 util_strlcat(attr, str, len);
734 if (stat(attr, &stats) == 0) {
735 found = 1;
736 break;
737 }
738 pos[1] = '\0';
739 }
740 closedir(dir);
741 }
742 if (!found)
743 util_strlcat(attr, str, len);
744 }
745
746 return found;
747 }
748
749 static int get_key(struct udev *udev, char **line, char **key, enum operation_type *op, char **value)
750 {
751 char *linepos;
752 char *temp;
753
754 linepos = *line;
755 if (linepos == NULL && linepos[0] == '\0')
756 return -1;
757
758 /* skip whitespace */
759 while (isspace(linepos[0]) || linepos[0] == ',')
760 linepos++;
761
762 /* get the key */
763 if (linepos[0] == '\0')
764 return -1;
765 *key = linepos;
766
767 while (1) {
768 linepos++;
769 if (linepos[0] == '\0')
770 return -1;
771 if (isspace(linepos[0]))
772 break;
773 if (linepos[0] == '=')
774 break;
775 if ((linepos[0] == '+') || (linepos[0] == '!') || (linepos[0] == ':'))
776 if (linepos[1] == '=')
777 break;
778 }
779
780 /* remember end of key */
781 temp = linepos;
782
783 /* skip whitespace after key */
784 while (isspace(linepos[0]))
785 linepos++;
786 if (linepos[0] == '\0')
787 return -1;
788
789 /* get operation type */
790 if (linepos[0] == '=' && linepos[1] == '=') {
791 *op = OP_MATCH;
792 linepos += 2;
793 } else if (linepos[0] == '!' && linepos[1] == '=') {
794 *op = OP_NOMATCH;
795 linepos += 2;
796 } else if (linepos[0] == '+' && linepos[1] == '=') {
797 *op = OP_ADD;
798 linepos += 2;
799 } else if (linepos[0] == '=') {
800 *op = OP_ASSIGN;
801 linepos++;
802 } else if (linepos[0] == ':' && linepos[1] == '=') {
803 *op = OP_ASSIGN_FINAL;
804 linepos += 2;
805 } else
806 return -1;
807
808 /* terminate key */
809 temp[0] = '\0';
810
811 /* skip whitespace after operator */
812 while (isspace(linepos[0]))
813 linepos++;
814 if (linepos[0] == '\0')
815 return -1;
816
817 /* get the value */
818 if (linepos[0] == '"')
819 linepos++;
820 else
821 return -1;
822 *value = linepos;
823
824 /* terminate */
825 temp = strchr(linepos, '"');
826 if (!temp)
827 return -1;
828 temp[0] = '\0';
829 temp++;
830 dbg(udev, "%s '%s'-'%s'\n", operation_str[*op], *key, *value);
831
832 /* move line to next key */
833 *line = temp;
834 return 0;
835 }
836
837 /* extract possible KEY{attr} */
838 static char *get_key_attribute(struct udev *udev, char *str)
839 {
840 char *pos;
841 char *attr;
842
843 attr = strchr(str, '{');
844 if (attr != NULL) {
845 attr++;
846 pos = strchr(attr, '}');
847 if (pos == NULL) {
848 err(udev, "missing closing brace for format\n");
849 return NULL;
850 }
851 pos[0] = '\0';
852 dbg(udev, "attribute='%s'\n", attr);
853 return attr;
854 }
855 return NULL;
856 }
857
858 static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
859 enum operation_type op,
860 const char *value, const void *data)
861 {
862 struct token *token = &rule_tmp->token[rule_tmp->token_cur];
863 const char *attr = data;
864 enum string_glob_type glob;
865
866 memset(token, 0x00, sizeof(struct token));
867
868 switch (type) {
869 case TK_M_ACTION:
870 case TK_M_DEVPATH:
871 case TK_M_KERNEL:
872 case TK_M_SUBSYSTEM:
873 case TK_M_DRIVER:
874 case TK_M_WAITFOR:
875 case TK_M_DEVLINK:
876 case TK_M_NAME:
877 case TK_M_KERNELS:
878 case TK_M_SUBSYSTEMS:
879 case TK_M_DRIVERS:
880 case TK_M_PROGRAM:
881 case TK_M_IMPORT_FILE:
882 case TK_M_IMPORT_PROG:
883 case TK_M_IMPORT_PARENT:
884 case TK_M_RESULT:
885 case TK_A_OWNER:
886 case TK_A_GROUP:
887 case TK_A_MODE:
888 case TK_A_NAME:
889 case TK_A_DEVLINK:
890 case TK_A_GOTO:
891 token->key.value_off = add_string(rule_tmp->rules, value);
892 break;
893 case TK_M_ENV:
894 case TK_M_ATTR:
895 case TK_M_ATTRS:
896 case TK_A_ATTR:
897 case TK_A_ENV:
898 token->key.value_off = add_string(rule_tmp->rules, value);
899 token->key.attr_off = add_string(rule_tmp->rules, attr);
900 break;
901 case TK_M_TEST:
902 token->key.value_off = add_string(rule_tmp->rules, value);
903 if (data != NULL)
904 token->key.mode = *(mode_t *)data;
905 break;
906 case TK_A_IGNORE_DEVICE:
907 case TK_A_STRING_ESCAPE_NONE:
908 case TK_A_STRING_ESCAPE_REPLACE:
909 case TK_A_IGNORE_REMOVE:
910 case TK_A_LAST_RULE:
911 break;
912 case TK_A_RUN:
913 token->key.value_off = add_string(rule_tmp->rules, value);
914 token->key.ignore_error = *(int *)data;
915 break;
916 case TK_A_NUM_FAKE_PART:
917 token->key.num_fake_part = *(int *)data;
918 break;
919 case TK_A_DEVLINK_PRIO:
920 token->key.devlink_prio = *(int *)data;
921 break;
922 case TK_A_OWNER_ID:
923 token->key.uid = *(uid_t *)data;
924 break;
925 case TK_A_GROUP_ID:
926 token->key.gid = *(gid_t *)data;
927 break;
928 case TK_A_MODE_ID:
929 token->key.mode = *(mode_t *)data;
930 break;
931 case TK_A_EVENT_TIMEOUT:
932 token->key.event_timeout = *(int *)data;
933 break;
934 case TK_RULE:
935 case TK_M_PARENTS_MIN:
936 case TK_M_PARENTS_MAX:
937 case TK_M_MAX:
938 case TK_END:
939 case TK_UNSET:
940 err(rule_tmp->rules->udev, "wrong type %u\n", type);
941 return -1;
942 }
943
944 glob = GL_PLAIN;
945 if (value != NULL) {
946 if (type < TK_M_MAX) {
947 /* check if we need to split or call fnmatch() while matching rules */
948 int has_split;
949 int has_glob;
950
951 has_split = (strchr(value, '|') != NULL);
952 has_glob = (strchr(value, '*') != NULL || strchr(value, '?') != NULL ||
953 strchr(value, '[') != NULL || strchr(value, ']') != NULL);
954 if (has_split && has_glob) {
955 glob = GL_SPLIT_GLOB;
956 } else if (has_split) {
957 glob = GL_SPLIT;
958 } else if (has_glob) {
959 if (strcmp(value, "?*") == 0)
960 glob = GL_SOMETHING;
961 else
962 glob = GL_GLOB;
963 }
964 } else {
965 /* check if we need to substitute format strings for matching rules */
966 if (strchr(value, '%') != NULL || strchr(value, '$') != NULL)
967 glob = GL_FORMAT;
968 }
969 }
970
971 token->key.type = type;
972 token->key.op = op;
973 token->key.glob = glob;
974 rule_tmp->token_cur++;
975 if (rule_tmp->token_cur >= ARRAY_SIZE(rule_tmp->token)) {
976 err(rule_tmp->rules->udev, "temporary rule array too small\n");
977 return -1;
978 }
979 return 0;
980 }
981
982 static int sort_token(struct udev_rules *rules, struct rule_tmp *rule_tmp)
983 {
984 unsigned int i;
985 unsigned int start = 0;
986 unsigned int end = rule_tmp->token_cur;
987
988 for (i = 0; i < rule_tmp->token_cur; i++) {
989 enum token_type next_val = TK_UNSET;
990 unsigned int next_idx;
991 unsigned int j;
992
993 /* find smallest value */
994 for (j = start; j < end; j++) {
995 if (rule_tmp->token[j].type == TK_UNSET)
996 continue;
997 if (next_val == TK_UNSET || rule_tmp->token[j].type < next_val) {
998 next_val = rule_tmp->token[j].type;
999 next_idx = j;
1000 }
1001 }
1002
1003 /* add token and mark done */
1004 if (add_token(rules, &rule_tmp->token[next_idx]) != 0)
1005 return -1;
1006 rule_tmp->token[next_idx].type = TK_UNSET;
1007
1008 /* shrink range */
1009 if (next_idx == start)
1010 start++;
1011 if (next_idx+1 == end)
1012 end--;
1013 }
1014 return 0;
1015 }
1016
1017 static int add_rule(struct udev_rules *rules, char *line,
1018 const char *filename, unsigned int filename_off, unsigned int lineno)
1019 {
1020 int valid = 0;
1021 char *linepos;
1022 char *attr;
1023 int physdev = 0;
1024 struct rule_tmp rule_tmp;
1025
1026 memset(&rule_tmp, 0x00, sizeof(struct rule_tmp));
1027 rule_tmp.rules = rules;
1028 rule_tmp.rule.type = TK_RULE;
1029 rule_tmp.rule.rule.filename_off = filename_off;
1030 rule_tmp.rule.rule.filename_line = lineno;
1031
1032 linepos = line;
1033 while (1) {
1034 char *key;
1035 char *value;
1036 enum operation_type op;
1037
1038 if (get_key(rules->udev, &linepos, &key, &op, &value) != 0)
1039 break;
1040
1041 if (strcasecmp(key, "ACTION") == 0) {
1042 if (op > OP_MATCH_MAX) {
1043 err(rules->udev, "invalid ACTION operation\n");
1044 goto invalid;
1045 }
1046 rule_add_key(&rule_tmp, TK_M_ACTION, op, value, NULL);
1047 valid = 1;
1048 continue;
1049 }
1050
1051 if (strcasecmp(key, "DEVPATH") == 0) {
1052 if (op > OP_MATCH_MAX) {
1053 err(rules->udev, "invalid DEVPATH operation\n");
1054 goto invalid;
1055 }
1056 rule_add_key(&rule_tmp, TK_M_DEVPATH, op, value, NULL);
1057 valid = 1;
1058 continue;
1059 }
1060
1061 if (strcasecmp(key, "KERNEL") == 0) {
1062 if (op > OP_MATCH_MAX) {
1063 err(rules->udev, "invalid KERNEL operation\n");
1064 goto invalid;
1065 }
1066 rule_add_key(&rule_tmp, TK_M_KERNEL, op, value, NULL);
1067 valid = 1;
1068 continue;
1069 }
1070
1071 if (strcasecmp(key, "SUBSYSTEM") == 0) {
1072 if (op > OP_MATCH_MAX) {
1073 err(rules->udev, "invalid SUBSYSTEM operation\n");
1074 goto invalid;
1075 }
1076 /* bus, class, subsystem events should all be the same */
1077 if (strcmp(value, "subsystem") == 0 ||
1078 strcmp(value, "bus") == 0 ||
1079 strcmp(value, "class") == 0) {
1080 if (strcmp(value, "bus") == 0 || strcmp(value, "class") == 0)
1081 err(rules->udev, "'%s' must be specified as 'subsystem' \n"
1082 "please fix it in %s:%u", value, filename, lineno);
1083 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, "subsystem|class|bus", NULL);
1084 } else
1085 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, value, NULL);
1086 valid = 1;
1087 continue;
1088 }
1089
1090 if (strcasecmp(key, "DRIVER") == 0) {
1091 if (op > OP_MATCH_MAX) {
1092 err(rules->udev, "invalid DRIVER operation\n");
1093 goto invalid;
1094 }
1095 rule_add_key(&rule_tmp, TK_M_DRIVER, op, value, NULL);
1096 valid = 1;
1097 continue;
1098 }
1099
1100 if (strncasecmp(key, "ATTR{", sizeof("ATTR{")-1) == 0) {
1101 attr = get_key_attribute(rules->udev, key + sizeof("ATTR")-1);
1102 if (attr == NULL) {
1103 err(rules->udev, "error parsing ATTR attribute\n");
1104 goto invalid;
1105 }
1106 if (op < OP_MATCH_MAX) {
1107 rule_add_key(&rule_tmp, TK_M_ATTR, op, value, attr);
1108 } else {
1109 rule_add_key(&rule_tmp, TK_A_ATTR, op, value, attr);
1110 }
1111 valid = 1;
1112 continue;
1113 }
1114
1115 if (strcasecmp(key, "KERNELS") == 0 ||
1116 strcasecmp(key, "ID") == 0) {
1117 if (op > OP_MATCH_MAX) {
1118 err(rules->udev, "invalid KERNELS operation\n");
1119 goto invalid;
1120 }
1121 rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1122 valid = 1;
1123 continue;
1124 }
1125
1126 if (strcasecmp(key, "SUBSYSTEMS") == 0 ||
1127 strcasecmp(key, "BUS") == 0) {
1128 if (op > OP_MATCH_MAX) {
1129 err(rules->udev, "invalid SUBSYSTEMS operation\n");
1130 goto invalid;
1131 }
1132 rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1133 valid = 1;
1134 continue;
1135 }
1136
1137 if (strcasecmp(key, "DRIVERS") == 0) {
1138 if (op > OP_MATCH_MAX) {
1139 err(rules->udev, "invalid DRIVERS operation\n");
1140 goto invalid;
1141 }
1142 rule_add_key(&rule_tmp, TK_M_DRIVERS, op, value, NULL);
1143 valid = 1;
1144 continue;
1145 }
1146
1147 if (strncasecmp(key, "ATTRS{", sizeof("ATTRS{")-1) == 0 ||
1148 strncasecmp(key, "SYSFS{", sizeof("SYSFS{")-1) == 0) {
1149 if (op > OP_MATCH_MAX) {
1150 err(rules->udev, "invalid ATTRS operation\n");
1151 goto invalid;
1152 }
1153 attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);
1154 if (attr == NULL) {
1155 err(rules->udev, "error parsing ATTRS attribute\n");
1156 goto invalid;
1157 }
1158 if (strncmp(attr, "device/", 7) == 0)
1159 err(rules->udev, "the 'device' link may not be available in a future kernel, "
1160 "please fix it in %s:%u", filename, lineno);
1161 else if (strstr(attr, "../") != NULL)
1162 err(rules->udev, "do not reference parent sysfs directories directly, "
1163 "it may break with a future kernel, please fix it in %s:%u", filename, lineno);
1164 rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1165 valid = 1;
1166 continue;
1167 }
1168
1169 if (strncasecmp(key, "ENV{", sizeof("ENV{")-1) == 0) {
1170 attr = get_key_attribute(rules->udev, key + sizeof("ENV")-1);
1171 if (attr == NULL) {
1172 err(rules->udev, "error parsing ENV attribute\n");
1173 goto invalid;
1174 }
1175 if (strncmp(attr, "PHYSDEV", 7) == 0)
1176 physdev = 1;
1177 if (op < OP_MATCH_MAX) {
1178 if (rule_add_key(&rule_tmp, TK_M_ENV, op, value, attr) != 0)
1179 goto invalid;
1180 } else {
1181 if (rule_add_key(&rule_tmp, TK_A_ENV, op, value, attr) != 0)
1182 goto invalid;
1183 }
1184 valid = 1;
1185 continue;
1186 }
1187
1188 if (strcasecmp(key, "PROGRAM") == 0) {
1189 rule_add_key(&rule_tmp, TK_M_PROGRAM, op, value, NULL);
1190 valid = 1;
1191 continue;
1192 }
1193
1194 if (strcasecmp(key, "RESULT") == 0) {
1195 if (op > OP_MATCH_MAX) {
1196 err(rules->udev, "invalid RESULT operation\n");
1197 goto invalid;
1198 }
1199 rule_add_key(&rule_tmp, TK_M_RESULT, op, value, NULL);
1200 valid = 1;
1201 continue;
1202 }
1203
1204 if (strncasecmp(key, "IMPORT", sizeof("IMPORT")-1) == 0) {
1205 attr = get_key_attribute(rules->udev, key + sizeof("IMPORT")-1);
1206 if (attr != NULL && strstr(attr, "program")) {
1207 dbg(rules->udev, "IMPORT will be executed\n");
1208 rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1209 valid = 1;
1210 } else if (attr != NULL && strstr(attr, "file")) {
1211 dbg(rules->udev, "IMPORT will be included as file\n");
1212 rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1213 valid = 1;
1214 } else if (attr != NULL && strstr(attr, "parent")) {
1215 dbg(rules->udev, "IMPORT will include the parent values\n");
1216 rule_add_key(&rule_tmp, TK_M_IMPORT_PARENT, op, value, NULL);
1217 valid = 1;
1218 } else {
1219 /* figure it out if it is executable */
1220 char file[UTIL_PATH_SIZE];
1221 char *pos;
1222 struct stat statbuf;
1223
1224 util_strlcpy(file, value, sizeof(file));
1225 pos = strchr(file, ' ');
1226 if (pos)
1227 pos[0] = '\0';
1228
1229 /* allow programs in /lib/udev called without the path */
1230 if (strchr(file, '/') == NULL) {
1231 util_strlcpy(file, UDEV_PREFIX "/lib/udev/", sizeof(file));
1232 util_strlcat(file, value, sizeof(file));
1233 pos = strchr(file, ' ');
1234 if (pos)
1235 pos[0] = '\0';
1236 }
1237
1238 dbg(rules->udev, "IMPORT auto mode for '%s'\n", file);
1239 if (!lstat(file, &statbuf) && (statbuf.st_mode & S_IXUSR)) {
1240 dbg(rules->udev, "IMPORT will be executed (autotype)\n");
1241 rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1242 valid = 1;
1243 } else {
1244 dbg(rules->udev, "IMPORT will be included as file (autotype)\n");
1245 rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1246 valid = 1;
1247 }
1248 }
1249 continue;
1250 }
1251
1252 if (strncasecmp(key, "TEST", sizeof("TEST")-1) == 0) {
1253 mode_t mode = 0;
1254
1255 if (op > OP_MATCH_MAX) {
1256 err(rules->udev, "invalid TEST operation\n");
1257 goto invalid;
1258 }
1259 attr = get_key_attribute(rules->udev, key + sizeof("TEST")-1);
1260 if (attr != NULL) {
1261 mode = strtol(attr, NULL, 8);
1262 rule_add_key(&rule_tmp, TK_M_TEST, op, value, &mode);
1263 } else {
1264 rule_add_key(&rule_tmp, TK_M_TEST, op, value, NULL);
1265 }
1266 valid = 1;
1267 continue;
1268 }
1269
1270 if (strncasecmp(key, "RUN", sizeof("RUN")-1) == 0) {
1271 int flag = 0;
1272
1273 attr = get_key_attribute(rules->udev, key + sizeof("RUN")-1);
1274 if (attr != NULL && strstr(attr, "ignore_error"))
1275 flag = 1;
1276 rule_add_key(&rule_tmp, TK_A_RUN, op, value, &flag);
1277 valid = 1;
1278 continue;
1279 }
1280
1281 if (strcasecmp(key, "WAIT_FOR") == 0 || strcasecmp(key, "WAIT_FOR_SYSFS") == 0) {
1282 rule_add_key(&rule_tmp, TK_M_WAITFOR, 0, value, NULL);
1283 valid = 1;
1284 continue;
1285 }
1286
1287 if (strcasecmp(key, "LABEL") == 0) {
1288 rule_tmp.rule.rule.label_off = add_string(rules, value);
1289 valid = 1;
1290 continue;
1291 }
1292
1293 if (strcasecmp(key, "GOTO") == 0) {
1294 rule_add_key(&rule_tmp, TK_A_GOTO, 0, value, NULL);
1295 valid = 1;
1296 continue;
1297 }
1298
1299 if (strncasecmp(key, "NAME", sizeof("NAME")-1) == 0) {
1300 if (op < OP_MATCH_MAX) {
1301 rule_add_key(&rule_tmp, TK_M_NAME, op, value, NULL);
1302 } else {
1303 if (value[0] == '\0')
1304 dbg(rules->udev, "name empty, node creation suppressed\n");
1305 rule_add_key(&rule_tmp, TK_A_NAME, op, value, NULL);
1306 attr = get_key_attribute(rules->udev, key + sizeof("NAME")-1);
1307 if (attr != NULL) {
1308 if (strstr(attr, "all_partitions") != NULL) {
1309 int num = DEFAULT_FAKE_PARTITIONS_COUNT;
1310
1311 dbg(rules->udev, "creation of partition nodes requested\n");
1312 rule_add_key(&rule_tmp, TK_A_NUM_FAKE_PART, 0, NULL, &num);
1313 }
1314 if (strstr(attr, "ignore_remove") != NULL) {
1315 dbg(rules->udev, "remove event should be ignored\n");
1316 rule_add_key(&rule_tmp, TK_A_IGNORE_REMOVE, 0, NULL, NULL);
1317 }
1318 }
1319 }
1320 rule_tmp.rule.rule.flags = 1;
1321 continue;
1322 }
1323
1324 if (strcasecmp(key, "SYMLINK") == 0) {
1325 if (op < OP_MATCH_MAX)
1326 rule_add_key(&rule_tmp, TK_M_DEVLINK, op, value, NULL);
1327 else
1328 rule_add_key(&rule_tmp, TK_A_DEVLINK, op, value, NULL);
1329 rule_tmp.rule.rule.flags = 1;
1330 valid = 1;
1331 continue;
1332 }
1333
1334 if (strcasecmp(key, "OWNER") == 0) {
1335 uid_t uid;
1336 char *endptr;
1337
1338 uid = strtoul(value, &endptr, 10);
1339 if (endptr[0] == '\0') {
1340 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1341 } else if (rules->resolve_names && strchr("$%", value[0]) == NULL) {
1342 uid = add_uid(rules, value);
1343 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1344 } else {
1345 rule_add_key(&rule_tmp, TK_A_OWNER, op, value, NULL);
1346 }
1347 rule_tmp.rule.rule.flags = 1;
1348 valid = 1;
1349 continue;
1350 }
1351
1352 if (strcasecmp(key, "GROUP") == 0) {
1353 gid_t gid;
1354 char *endptr;
1355
1356 gid = strtoul(value, &endptr, 10);
1357 if (endptr[0] == '\0') {
1358 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1359 } else if (rules->resolve_names && strchr("$%", value[0]) == NULL) {
1360 gid = add_gid(rules, value);
1361 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1362 } else {
1363 rule_add_key(&rule_tmp, TK_A_GROUP, op, value, NULL);
1364 }
1365 rule_tmp.rule.rule.flags = 1;
1366 valid = 1;
1367 continue;
1368 }
1369
1370 if (strcasecmp(key, "MODE") == 0) {
1371 mode_t mode;
1372 char *endptr;
1373
1374 mode = strtol(value, &endptr, 8);
1375 if (endptr[0] == '\0')
1376 rule_add_key(&rule_tmp, TK_A_MODE_ID, op, NULL, &mode);
1377 else
1378 rule_add_key(&rule_tmp, TK_A_MODE, op, value, NULL);
1379 rule_tmp.rule.rule.flags = 1;
1380 valid = 1;
1381 continue;
1382 }
1383
1384 if (strcasecmp(key, "OPTIONS") == 0) {
1385 const char *pos;
1386
1387 if (strstr(value, "last_rule") != NULL) {
1388 dbg(rules->udev, "last rule to be applied\n");
1389 rule_add_key(&rule_tmp, TK_A_LAST_RULE, 0, NULL, NULL);
1390 }
1391 if (strstr(value, "ignore_device") != NULL) {
1392 dbg(rules->udev, "device should be ignored\n");
1393 rule_add_key(&rule_tmp, TK_A_IGNORE_DEVICE, 0, NULL, NULL);
1394 }
1395 if (strstr(value, "ignore_remove") != NULL) {
1396 dbg(rules->udev, "remove event should be ignored\n");
1397 rule_add_key(&rule_tmp, TK_A_IGNORE_REMOVE, 0, NULL, NULL);
1398 }
1399 pos = strstr(value, "link_priority=");
1400 if (pos != NULL) {
1401 int prio = atoi(&pos[strlen("link_priority=")]);
1402
1403 rule_add_key(&rule_tmp, TK_A_DEVLINK_PRIO, 0, NULL, &prio);
1404 dbg(rules->udev, "link priority=%i\n", prio);
1405 }
1406 pos = strstr(value, "event_timeout=");
1407 if (pos != NULL) {
1408 int tout = atoi(&pos[strlen("event_timeout=")]);
1409
1410 rule_add_key(&rule_tmp, TK_A_EVENT_TIMEOUT, 0, NULL, &tout);
1411 dbg(rules->udev, "event timout=%i\n", tout);
1412 }
1413 pos = strstr(value, "string_escape=");
1414 if (pos != NULL) {
1415 pos = &pos[strlen("string_escape=")];
1416 if (strncmp(pos, "none", strlen("none")) == 0)
1417 rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_NONE, 0, NULL, NULL);
1418 else if (strncmp(pos, "replace", strlen("replace")) == 0)
1419 rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_REPLACE, 0, NULL, NULL);
1420 }
1421 if (strstr(value, "all_partitions") != NULL) {
1422 int num = DEFAULT_FAKE_PARTITIONS_COUNT;
1423
1424 rule_add_key(&rule_tmp, TK_A_NUM_FAKE_PART, 0, NULL, &num);
1425 dbg(rules->udev, "creation of partition nodes requested\n");
1426 }
1427 valid = 1;
1428 continue;
1429 }
1430 err(rules->udev, "unknown key '%s' in %s:%u\n", key, filename, lineno);
1431 }
1432
1433 if (physdev)
1434 err(rules->udev, "PHYSDEV* values are deprecated and not available on recent kernels, \n"
1435 "please fix it in %s:%u", filename, lineno);
1436
1437 /* skip line if not any valid key was found */
1438 if (!valid)
1439 goto invalid;
1440
1441 /* add rule token */
1442 if (add_token(rules, &rule_tmp.rule) != 0)
1443 goto invalid;
1444
1445 /* add tokens to list, sorted by type */
1446 if (sort_token(rules, &rule_tmp) != 0)
1447 goto invalid;
1448 return 0;
1449 invalid:
1450 err(rules->udev, "invalid rule '%s:%u'\n", filename, lineno);
1451 return -1;
1452 }
1453
1454 static int parse_file(struct udev_rules *rules, const char *filename, unsigned short filename_off)
1455 {
1456 FILE *f;
1457 unsigned int first_token;
1458 char line[UTIL_LINE_SIZE];
1459 int line_nr = 0;
1460 unsigned int i;
1461
1462 info(rules->udev, "reading '%s' as rules file\n", filename);
1463
1464 f = fopen(filename, "r");
1465 if (f == NULL)
1466 return -1;
1467
1468 first_token = rules->token_cur;
1469
1470 while(fgets(line, sizeof(line), f) != NULL) {
1471 char *key;
1472 size_t len;
1473
1474 /* skip whitespace */
1475 line_nr++;
1476 key = line;
1477 while (isspace(key[0]))
1478 key++;
1479
1480 /* comment */
1481 if (key[0] == '#')
1482 continue;
1483
1484 len = strlen(line);
1485 if (len < 3)
1486 continue;
1487
1488 /* continue reading if backslash+newline is found */
1489 while (line[len-2] == '\\') {
1490 if (fgets(&line[len-2], (sizeof(line)-len)+2, f) == NULL)
1491 break;
1492 line_nr++;
1493 len = strlen(line);
1494 }
1495
1496 if (len+1 >= sizeof(line)) {
1497 err(rules->udev, "line too long '%s':%u, ignored\n", filename, line_nr);
1498 continue;
1499 }
1500 add_rule(rules, key, filename, filename_off, line_nr);
1501 }
1502 fclose(f);
1503
1504 /* link GOTOs to LABEL rules in this file to be able to fast-forward */
1505 for (i = first_token+1; i < rules->token_cur; i++) {
1506 if (rules->tokens[i].type == TK_A_GOTO) {
1507 char *label = &rules->buf[rules->tokens[i].key.value_off];
1508 unsigned int j;
1509
1510 for (j = i+1; j < rules->token_cur; j++) {
1511 if (rules->tokens[j].type != TK_RULE)
1512 continue;
1513 if (rules->tokens[j].rule.label_off == 0)
1514 continue;
1515 if (strcmp(label, &rules->buf[rules->tokens[j].rule.label_off]) != 0)
1516 continue;
1517 rules->tokens[i].key.rule_goto = j;
1518 }
1519 if (rules->tokens[i].key.rule_goto == 0)
1520 err(rules->udev, "GOTO '%s' has no matching label in: '%s'\n", label, filename);
1521 }
1522 }
1523 return 0;
1524 }
1525
1526 static int add_matching_files(struct udev *udev, struct udev_list_node *file_list, const char *dirname, const char *suffix)
1527 {
1528 struct dirent *ent;
1529 DIR *dir;
1530 char filename[UTIL_PATH_SIZE];
1531
1532 dbg(udev, "open directory '%s'\n", dirname);
1533 dir = opendir(dirname);
1534 if (dir == NULL) {
1535 err(udev, "unable to open '%s': %m\n", dirname);
1536 return -1;
1537 }
1538
1539 while (1) {
1540 ent = readdir(dir);
1541 if (ent == NULL || ent->d_name[0] == '\0')
1542 break;
1543
1544 if ((ent->d_name[0] == '.') || (ent->d_name[0] == '#'))
1545 continue;
1546
1547 /* look for file matching with specified suffix */
1548 if (suffix != NULL) {
1549 const char *ext;
1550
1551 ext = strrchr(ent->d_name, '.');
1552 if (ext == NULL)
1553 continue;
1554 if (strcmp(ext, suffix) != 0)
1555 continue;
1556 }
1557 dbg(udev, "put file '%s/%s' into list\n", dirname, ent->d_name);
1558
1559 snprintf(filename, sizeof(filename), "%s/%s", dirname, ent->d_name);
1560 filename[sizeof(filename)-1] = '\0';
1561 udev_list_entry_add(udev, file_list, filename, NULL, 1, 1);
1562 }
1563
1564 closedir(dir);
1565 return 0;
1566 }
1567
1568 struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
1569 {
1570 struct udev_rules *rules;
1571 struct stat statbuf;
1572 struct udev_list_node file_list;
1573 struct udev_list_entry *file_loop, *file_tmp;
1574 unsigned int prev_rule;
1575 struct token end_token;
1576 unsigned int i;
1577
1578 rules = malloc(sizeof(struct udev_rules));
1579 if (rules == NULL)
1580 return NULL;
1581 memset(rules, 0x00, sizeof(struct udev_rules));
1582 rules->udev = udev;
1583 rules->resolve_names = resolve_names;
1584 udev_list_init(&file_list);
1585
1586 /* init token array and string buffer */
1587 rules->tokens = malloc(PREALLOC_TOKEN * sizeof(struct token));
1588 if (rules->tokens == NULL)
1589 return NULL;
1590 rules->token_max = PREALLOC_TOKEN;
1591 rules->buf = malloc(PREALLOC_STRBUF);
1592 if (rules->buf == NULL)
1593 return NULL;
1594 rules->buf_max = PREALLOC_STRBUF;
1595 /* offset 0 is always '\0' */
1596 rules->buf[0] = '\0';
1597 rules->buf_cur = 1;
1598 dbg(udev, "prealloc %zu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
1599 rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
1600
1601 if (udev_get_rules_path(udev) != NULL) {
1602 /* custom rules location for testing */
1603 add_matching_files(udev, &file_list, udev_get_rules_path(udev), ".rules");
1604 } else {
1605 char filename[PATH_MAX];
1606 struct udev_list_node sort_list;
1607 struct udev_list_entry *sort_loop, *sort_tmp;
1608
1609 /* read user/custom rules */
1610 add_matching_files(udev, &file_list, SYSCONFDIR "/udev/rules.d", ".rules");
1611
1612 /* read dynamic/temporary rules */
1613 util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
1614 util_strlcat(filename, "/.udev/rules.d", sizeof(filename));
1615 if (stat(filename, &statbuf) != 0) {
1616 util_create_path(udev, filename);
1617 udev_selinux_setfscreatecon(udev, filename, S_IFDIR|0755);
1618 mkdir(filename, 0755);
1619 udev_selinux_resetfscreatecon(udev);
1620 }
1621 udev_list_init(&sort_list);
1622 add_matching_files(udev, &sort_list, filename, ".rules");
1623
1624 /* read default rules */
1625 add_matching_files(udev, &sort_list, UDEV_PREFIX "/lib/udev/rules.d", ".rules");
1626
1627 /* sort all rules files by basename into list of files */
1628 udev_list_entry_foreach_safe(sort_loop, sort_tmp, udev_list_get_entry(&sort_list)) {
1629 const char *sort_name = udev_list_entry_get_name(sort_loop);
1630 const char *sort_base = strrchr(sort_name, '/');
1631
1632 if (sort_base == NULL)
1633 continue;
1634 /* sort entry into existing list */
1635 udev_list_entry_foreach_safe(file_loop, file_tmp, udev_list_get_entry(&file_list)) {
1636 const char *file_name = udev_list_entry_get_name(file_loop);
1637 const char *file_base = strrchr(file_name, '/');
1638
1639 if (file_base == NULL)
1640 continue;
1641 if (strcmp(file_base, sort_base) == 0) {
1642 info(udev, "rule file basename '%s' already added, ignoring '%s'\n",
1643 file_name, sort_name);
1644 udev_list_entry_delete(sort_loop);
1645 sort_loop = NULL;
1646 break;
1647 }
1648 if (strcmp(file_base, sort_base) > 0) {
1649 /* found later file, insert before */
1650 udev_list_entry_remove(sort_loop);
1651 udev_list_entry_insert_before(sort_loop, file_loop);
1652 sort_loop = NULL;
1653 break;
1654 }
1655 }
1656 /* current file already handled */
1657 if (sort_loop == NULL)
1658 continue;
1659 /* no later file, append to end of list */
1660 udev_list_entry_remove(sort_loop);
1661 udev_list_entry_append(sort_loop, &file_list);
1662 }
1663 }
1664
1665 /* add all filenames to the string buffer */
1666 udev_list_entry_foreach(file_loop, udev_list_get_entry(&file_list)) {
1667 const char *filename = udev_list_entry_get_name(file_loop);
1668 unsigned int filename_off;
1669
1670 filename_off = add_string(rules, filename);
1671 /* the offset in the rule is limited to unsigned short */
1672 if (filename_off < USHRT_MAX)
1673 udev_list_entry_set_flag(file_loop, filename_off);
1674 }
1675
1676 /* parse list of files */
1677 udev_list_entry_foreach_safe(file_loop, file_tmp, udev_list_get_entry(&file_list)) {
1678 const char *filename = udev_list_entry_get_name(file_loop);
1679 unsigned int filename_off = udev_list_entry_get_flag(file_loop);
1680
1681 if (stat(filename, &statbuf) == 0 && statbuf.st_size > 0)
1682 parse_file(rules, filename, filename_off);
1683 else
1684 info(udev, "can not read '%s'\n", filename);
1685 udev_list_entry_delete(file_loop);
1686 }
1687
1688 memset(&end_token, 0x00, sizeof(struct token));
1689 end_token.type = TK_END;
1690 add_token(rules, &end_token);
1691
1692 /* link all TK_RULE tokens to be able to fast-forward to next TK_RULE */
1693 prev_rule = 0;
1694 for (i = 1; i < rules->token_cur; i++) {
1695 if (rules->tokens[i].type == TK_RULE) {
1696 rules->tokens[prev_rule].rule.next_rule = i;
1697 prev_rule = i;
1698 }
1699 }
1700
1701 /* shrink allocated token and string buffer */
1702 if (rules->token_cur < rules->token_max) {
1703 struct token *tokens;
1704
1705 tokens = realloc(rules->tokens, rules->token_cur * sizeof(struct token));
1706 if (tokens != NULL || rules->token_cur == 0) {
1707 rules->tokens = tokens;
1708 rules->token_max = rules->token_cur;
1709 }
1710 }
1711 if (rules->buf_cur < rules->buf_max) {
1712 char *buf;
1713
1714 buf = realloc(rules->buf, rules->buf_cur);
1715 if (buf != NULL || rules->buf_cur == 0) {
1716 rules->buf = buf;
1717 rules->buf_max = rules->buf_cur;
1718 }
1719 }
1720 info(udev, "shrunk to %lu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
1721 rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
1722
1723 /* cleanup uid/gid cache */
1724 free(rules->uids);
1725 rules->uids = NULL;
1726 rules->uids_cur = 0;
1727 rules->uids_max = 0;
1728 free(rules->gids);
1729 rules->gids = NULL;
1730 rules->gids_cur = 0;
1731 rules->gids_max = 0;
1732
1733 dump_rules(rules);
1734 return rules;
1735 }
1736
1737 void udev_rules_unref(struct udev_rules *rules)
1738 {
1739 if (rules == NULL)
1740 return;
1741 free(rules->tokens);
1742 free(rules->buf);
1743 free(rules->uids);
1744 free(rules->gids);
1745 free(rules);
1746 }
1747
1748 static int match_key(struct udev_rules *rules, struct token *token, const char *val)
1749 {
1750 char *key_value = &rules->buf[token->key.value_off];
1751 char *pos;
1752 int match = 0;
1753
1754 if (val == NULL)
1755 val = "";
1756
1757 switch (token->key.glob) {
1758 case GL_PLAIN:
1759 match = (strcmp(key_value, val) == 0);
1760 break;
1761 case GL_GLOB:
1762 match = (fnmatch(key_value, val, 0) == 0);
1763 break;
1764 case GL_SPLIT:
1765 {
1766 const char *split;
1767 size_t len;
1768
1769 split = &rules->buf[token->key.value_off];
1770 len = strlen(val);
1771 while (1) {
1772 const char *next;
1773
1774 next = strchr(split, '|');
1775 if (next != NULL) {
1776 size_t matchlen = (size_t)(next - split);
1777
1778 match = (matchlen == len && strncmp(split, val, matchlen) == 0);
1779 if (match)
1780 break;
1781 } else {
1782 match = (strcmp(split, val) == 0);
1783 break;
1784 }
1785 split = &next[1];
1786 }
1787 break;
1788 }
1789 case GL_SPLIT_GLOB:
1790 {
1791 char value[UTIL_PATH_SIZE];
1792
1793 util_strlcpy(value, &rules->buf[token->key.value_off], sizeof(value));
1794 key_value = value;
1795 while (key_value != NULL) {
1796 pos = strchr(key_value, '|');
1797 if (pos != NULL) {
1798 pos[0] = '\0';
1799 pos = &pos[1];
1800 }
1801 dbg(rules->udev, "match %s '%s' <-> '%s'\n", token_str[token->type], key_value, val);
1802 match = (fnmatch(key_value, val, 0) == 0);
1803 if (match)
1804 break;
1805 key_value = pos;
1806 }
1807 break;
1808 }
1809 case GL_SOMETHING:
1810 match = (val[0] != '\0');
1811 break;
1812 case GL_FORMAT:
1813 case GL_UNSET:
1814 return -1;
1815 }
1816
1817 if (match && (token->key.op == OP_MATCH)) {
1818 dbg(rules->udev, "%s is true (matching value)\n", token_str[token->type]);
1819 return 0;
1820 }
1821 if (!match && (token->key.op == OP_NOMATCH)) {
1822 dbg(rules->udev, "%s is true (non-matching value)\n", token_str[token->type]);
1823 return 0;
1824 }
1825 dbg(rules->udev, "%s is not true\n", token_str[token->type]);
1826 return -1;
1827 }
1828
1829 static int match_attr(struct udev_rules *rules, struct udev_device *dev, struct udev_event *event, struct token *cur)
1830 {
1831 const char *key_name = &rules->buf[cur->key.attr_off];
1832 const char *key_value = &rules->buf[cur->key.value_off];
1833 char value[UTIL_NAME_SIZE];
1834 size_t len;
1835
1836 value[0] = '\0';
1837 if (key_name[0] == '[') {
1838 char attr[UTIL_PATH_SIZE];
1839
1840 util_strlcpy(attr, key_name, sizeof(attr));
1841 util_resolve_subsys_kernel(event->udev, attr, value, sizeof(value), 1);
1842 }
1843 if (value[0] == '\0') {
1844 const char *val;
1845
1846 val = udev_device_get_sysattr_value(dev, key_name);
1847 if (val == NULL)
1848 return -1;
1849 util_strlcpy(value, val, sizeof(value));
1850 }
1851
1852 /* strip trailing whitespace of value, if not asked to match for it */
1853 len = strlen(key_value);
1854 if (len > 0 && !isspace(key_value[len-1])) {
1855 len = strlen(value);
1856 while (len > 0 && isspace(value[--len]))
1857 value[len] = '\0';
1858 dbg(rules->udev, "removed trailing whitespace from '%s'\n", value);
1859 }
1860 return match_key(rules, cur, value);
1861 }
1862
1863 enum escape_type {
1864 ESCAPE_UNSET,
1865 ESCAPE_NONE,
1866 ESCAPE_REPLACE,
1867 };
1868
1869 int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event)
1870 {
1871 struct token *cur;
1872 struct token *rule;
1873 enum escape_type esc = ESCAPE_UNSET;
1874 int can_set_name;
1875
1876 if (rules->tokens == NULL)
1877 return -1;
1878
1879 can_set_name = ((strcmp(udev_device_get_action(event->dev), "add") == 0 ||
1880 strcmp(udev_device_get_action(event->dev), "change") == 0) &&
1881 (major(udev_device_get_devnum(event->dev)) > 0 ||
1882 strcmp(udev_device_get_subsystem(event->dev), "net") == 0));
1883
1884 /* loop through token list, match, run actions or forward to next rule */
1885 cur = &rules->tokens[0];
1886 rule = cur;
1887 while (1) {
1888 unsigned int idx;
1889
1890 dump_token(rules, cur);
1891 switch (cur->type) {
1892 case TK_RULE:
1893 /* current rule */
1894 rule = cur;
1895 /* possibly skip rules which want to set NAME, SYMLINK, OWNER, GROUP, MODE */
1896 if (!can_set_name && rule->rule.flags)
1897 ;//goto nomatch;
1898 esc = ESCAPE_UNSET;
1899 break;
1900 case TK_M_ACTION:
1901 if (match_key(rules, cur, udev_device_get_action(event->dev)) != 0)
1902 goto nomatch;
1903 break;
1904 case TK_M_DEVPATH:
1905 if (match_key(rules, cur, udev_device_get_devpath(event->dev)) != 0)
1906 goto nomatch;
1907 break;
1908 case TK_M_KERNEL:
1909 if (match_key(rules, cur, udev_device_get_sysname(event->dev)) != 0)
1910 goto nomatch;
1911 break;
1912 case TK_M_DEVLINK:
1913 {
1914 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
1915 struct udev_list_entry *list_entry;
1916 int match = 0;
1917
1918 udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(event->dev)) {
1919 const char *devlink;
1920
1921 devlink = &udev_list_entry_get_name(list_entry)[devlen];
1922 if (match_key(rules, cur, devlink) == 0) {
1923 match = 1;
1924 break;
1925 }
1926 }
1927 if (!match)
1928 goto nomatch;
1929 break;
1930 }
1931 case TK_M_NAME:
1932 if (match_key(rules, cur, event->name) != 0)
1933 goto nomatch;
1934 break;
1935 case TK_M_ENV:
1936 {
1937 struct udev_list_entry *list_entry;
1938 const char *key_name = &rules->buf[cur->key.attr_off];
1939 const char *value;
1940
1941 list_entry = udev_device_get_properties_list_entry(event->dev);
1942 list_entry = udev_list_entry_get_by_name(list_entry, key_name);
1943 value = udev_list_entry_get_value(list_entry);
1944 if (value == NULL) {
1945 dbg(event->udev, "ENV{%s} is not set, treat as empty\n", key_name);
1946 value = "";
1947 }
1948 if (match_key(rules, cur, value))
1949 goto nomatch;
1950 break;
1951 }
1952 case TK_M_SUBSYSTEM:
1953 if (match_key(rules, cur, udev_device_get_subsystem(event->dev)) != 0)
1954 goto nomatch;
1955 break;
1956 case TK_M_DRIVER:
1957 if (match_key(rules, cur, udev_device_get_driver(event->dev)) != 0)
1958 goto nomatch;
1959 break;
1960 case TK_M_WAITFOR:
1961 {
1962 char filename[UTIL_PATH_SIZE];
1963 int found;
1964
1965 util_strlcpy(filename, &rules->buf[cur->key.value_off], sizeof(filename));
1966 udev_event_apply_format(event, filename, sizeof(filename));
1967 found = (wait_for_file(event->dev, filename, 10) == 0);
1968 if (!found && (cur->key.op != OP_NOMATCH))
1969 goto nomatch;
1970 break;
1971 }
1972 case TK_M_ATTR:
1973 if (match_attr(rules, event->dev, event, cur) != 0)
1974 goto nomatch;
1975 break;
1976 case TK_M_KERNELS:
1977 case TK_M_SUBSYSTEMS:
1978 case TK_M_DRIVERS:
1979 case TK_M_ATTRS:
1980 {
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 while (1) {
1991 struct token *key;
1992
1993 dbg(event->udev, "parent: '%s'\n", udev_device_get_syspath(event->dev_parent));
1994 /* loop over sequence of parent match keys */
1995 for (key = cur; key < next; key++ ) {
1996 dump_token(rules, key);
1997 switch(key->type) {
1998 case TK_M_KERNELS:
1999 if (match_key(rules, key, udev_device_get_sysname(event->dev_parent)) != 0)
2000 goto try_parent;
2001 break;
2002 case TK_M_SUBSYSTEMS:
2003 if (match_key(rules, key, udev_device_get_subsystem(event->dev_parent)) != 0)
2004 goto try_parent;
2005 break;
2006 case TK_M_DRIVERS:
2007 if (match_key(rules, key, udev_device_get_driver(event->dev_parent)) != 0)
2008 goto try_parent;
2009 break;
2010 case TK_M_ATTRS:
2011 if (match_attr(rules, event->dev_parent, event, key) != 0)
2012 goto try_parent;
2013 break;
2014 default:
2015 goto nomatch;
2016 }
2017 dbg(event->udev, "parent key matched\n");
2018 }
2019 dbg(event->udev, "all parent keys matched\n");
2020 /* all keys matched */
2021 break;
2022
2023 try_parent:
2024 event->dev_parent = udev_device_get_parent(event->dev_parent);
2025 if (event->dev_parent == NULL)
2026 goto nomatch;
2027 }
2028 /* move behind our sequence of parent match keys */
2029 cur = next;
2030 continue;
2031 }
2032 case TK_M_TEST:
2033 {
2034 char filename[UTIL_PATH_SIZE];
2035 struct stat statbuf;
2036 int match;
2037
2038 util_strlcpy(filename, &rules->buf[cur->key.value_off], sizeof(filename));
2039 udev_event_apply_format(event, filename, sizeof(filename));
2040 if (util_resolve_subsys_kernel(event->udev, NULL, filename, sizeof(filename), 0) != 0)
2041 if (filename[0] != '/') {
2042 char tmp[UTIL_PATH_SIZE];
2043
2044 util_strlcpy(tmp, udev_device_get_syspath(event->dev), sizeof(tmp));
2045 util_strlcat(tmp, "/", sizeof(tmp));
2046 util_strlcat(tmp, filename, sizeof(tmp));
2047 util_strlcpy(filename, tmp, sizeof(filename));
2048 }
2049
2050 attr_subst_subdir(filename, sizeof(filename));
2051
2052 match = (stat(filename, &statbuf) == 0);
2053 dbg(event->udev, "'%s' %s", filename, match ? "exists\n" : "does not exist\n");
2054 if (match && cur->key.mode > 0) {
2055 match = ((statbuf.st_mode & cur->key.mode) > 0);
2056 dbg(event->udev, "'%s' has mode=%#o and %s %#o\n", filename, statbuf.st_mode,
2057 match ? "matches" : "does not match", cur->key.mode);
2058 }
2059 if (match && cur->key.op == OP_NOMATCH)
2060 goto nomatch;
2061 if (!match && cur->key.op == OP_MATCH)
2062 goto nomatch;
2063 break;
2064 }
2065 case TK_M_PROGRAM:
2066 {
2067 char program[UTIL_PATH_SIZE];
2068 char **envp;
2069 char result[UTIL_PATH_SIZE];
2070
2071 free(event->program_result);
2072 event->program_result = NULL;
2073 util_strlcpy(program, &rules->buf[cur->key.value_off], sizeof(program));
2074 udev_event_apply_format(event, program, sizeof(program));
2075 envp = udev_device_get_properties_envp(event->dev);
2076 info(event->udev, "PROGRAM '%s' %s:%u\n",
2077 program,
2078 &rules->buf[rule->rule.filename_off],
2079 rule->rule.filename_line);
2080 if (util_run_program(event->udev, program, envp, result, sizeof(result), NULL) != 0) {
2081 if (cur->key.op != OP_NOMATCH)
2082 goto nomatch;
2083 } else {
2084 int count;
2085
2086 util_remove_trailing_chars(result, '\n');
2087 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2088 count = util_replace_chars(result, ALLOWED_CHARS_INPUT);
2089 if (count > 0)
2090 info(event->udev, "%i character(s) replaced\n" , count);
2091 }
2092 event->program_result = strdup(result);
2093 dbg(event->udev, "storing result '%s'\n", event->program_result);
2094 if (cur->key.op == OP_NOMATCH)
2095 goto nomatch;
2096 }
2097 break;
2098 }
2099 case TK_M_IMPORT_FILE:
2100 {
2101 char import[UTIL_PATH_SIZE];
2102
2103 util_strlcpy(import, &rules->buf[cur->key.value_off], sizeof(import));
2104 udev_event_apply_format(event, import, sizeof(import));
2105 if (import_file_into_properties(event->dev, import) != 0)
2106 if (cur->key.op != OP_NOMATCH)
2107 goto nomatch;
2108 break;
2109 }
2110 case TK_M_IMPORT_PROG:
2111 {
2112 char import[UTIL_PATH_SIZE];
2113
2114 util_strlcpy(import, &rules->buf[cur->key.value_off], sizeof(import));
2115 udev_event_apply_format(event, import, sizeof(import));
2116 info(event->udev, "IMPORT '%s' %s:%u\n",
2117 import,
2118 &rules->buf[rule->rule.filename_off],
2119 rule->rule.filename_line);
2120 if (import_program_into_properties(event->dev, import) != 0)
2121 if (cur->key.op != OP_NOMATCH)
2122 goto nomatch;
2123 break;
2124 }
2125 case TK_M_IMPORT_PARENT:
2126 {
2127 char import[UTIL_PATH_SIZE];
2128
2129 util_strlcpy(import, &rules->buf[cur->key.value_off], sizeof(import));
2130 udev_event_apply_format(event, import, sizeof(import));
2131 if (import_parent_into_properties(event->dev, import) != 0)
2132 if (cur->key.op != OP_NOMATCH)
2133 goto nomatch;
2134 break;
2135 }
2136 case TK_M_RESULT:
2137 if (match_key(rules, cur, event->program_result) != 0)
2138 goto nomatch;
2139 break;
2140
2141 case TK_A_IGNORE_DEVICE:
2142 event->ignore_device = 1;
2143 return 0;
2144 break;
2145 case TK_A_STRING_ESCAPE_NONE:
2146 esc = ESCAPE_NONE;
2147 break;
2148 case TK_A_STRING_ESCAPE_REPLACE:
2149 esc = ESCAPE_REPLACE;
2150 break;
2151 case TK_A_NUM_FAKE_PART:
2152 if (strcmp(udev_device_get_subsystem(event->dev), "block") != 0)
2153 break;
2154 if (udev_device_get_sysnum(event->dev) != NULL)
2155 break;
2156 udev_device_set_num_fake_partitions(event->dev, cur->key.num_fake_part);
2157 break;
2158 case TK_A_DEVLINK_PRIO:
2159 udev_device_set_devlink_priority(event->dev, cur->key.devlink_prio);
2160 break;
2161 case TK_A_OWNER:
2162 {
2163 char owner[UTIL_NAME_SIZE];
2164
2165 if (event->owner_final)
2166 break;
2167 if (cur->key.op == OP_ASSIGN_FINAL)
2168 event->owner_final = 1;
2169 util_strlcpy(owner, &rules->buf[cur->key.value_off], sizeof(owner));
2170 udev_event_apply_format(event, owner, sizeof(owner));
2171 event->uid = util_lookup_user(event->udev, owner);
2172 info(event->udev, "OWNER %u %s:%u\n",
2173 event->uid,
2174 &rules->buf[rule->rule.filename_off],
2175 rule->rule.filename_line);
2176 break;
2177 }
2178 case TK_A_GROUP:
2179 {
2180 char group[UTIL_NAME_SIZE];
2181
2182 if (event->group_final)
2183 break;
2184 if (cur->key.op == OP_ASSIGN_FINAL)
2185 event->group_final = 1;
2186 util_strlcpy(group, &rules->buf[cur->key.value_off], sizeof(group));
2187 udev_event_apply_format(event, group, sizeof(group));
2188 event->gid = util_lookup_group(event->udev, group);
2189 info(event->udev, "GROUP %u %s:%u\n",
2190 event->gid,
2191 &rules->buf[rule->rule.filename_off],
2192 rule->rule.filename_line);
2193 break;
2194 }
2195 case TK_A_MODE:
2196 {
2197 char mode[UTIL_NAME_SIZE];
2198 char *endptr;
2199
2200 if (event->mode_final)
2201 break;
2202 if (cur->key.op == OP_ASSIGN_FINAL)
2203 event->mode_final = 1;
2204 util_strlcpy(mode, &rules->buf[cur->key.value_off], sizeof(mode));
2205 udev_event_apply_format(event, mode, sizeof(mode));
2206 event->mode = strtol(mode, &endptr, 8);
2207 if (endptr[0] != '\0') {
2208 err(event->udev, "invalide mode '%s' set default mode 0660\n", mode);
2209 event->mode = 0660;
2210 }
2211 info(event->udev, "MODE %#o %s:%u\n",
2212 event->mode,
2213 &rules->buf[rule->rule.filename_off],
2214 rule->rule.filename_line);
2215 break;
2216 }
2217 case TK_A_OWNER_ID:
2218 if (event->owner_final)
2219 break;
2220 if (cur->key.op == OP_ASSIGN_FINAL)
2221 event->owner_final = 1;
2222 event->uid = cur->key.uid;
2223 info(event->udev, "OWNER %u %s:%u\n",
2224 event->uid,
2225 &rules->buf[rule->rule.filename_off],
2226 rule->rule.filename_line);
2227 break;
2228 case TK_A_GROUP_ID:
2229 if (event->group_final)
2230 break;
2231 if (cur->key.op == OP_ASSIGN_FINAL)
2232 event->group_final = 1;
2233 event->gid = cur->key.gid;
2234 info(event->udev, "GROUP %u %s:%u\n",
2235 event->gid,
2236 &rules->buf[rule->rule.filename_off],
2237 rule->rule.filename_line);
2238 break;
2239 case TK_A_MODE_ID:
2240 if (event->mode_final)
2241 break;
2242 if (cur->key.op == OP_ASSIGN_FINAL)
2243 event->mode_final = 1;
2244 event->mode = cur->key.mode;
2245 info(event->udev, "MODE %#o %s:%u\n",
2246 event->mode,
2247 &rules->buf[rule->rule.filename_off],
2248 rule->rule.filename_line);
2249 break;
2250 case TK_A_ENV:
2251 {
2252 const char *name = &rules->buf[cur->key.attr_off];
2253 char *value = &rules->buf[cur->key.value_off];
2254
2255 if (value[0] != '\0') {
2256 char temp_value[UTIL_NAME_SIZE];
2257 struct udev_list_entry *entry;
2258
2259 util_strlcpy(temp_value, value, sizeof(temp_value));
2260 udev_event_apply_format(event, temp_value, sizeof(temp_value));
2261 entry = udev_device_add_property(event->dev, name, temp_value);
2262 /* store in db */
2263 udev_list_entry_set_flag(entry, 1);
2264 } else {
2265 udev_device_add_property(event->dev, name, NULL);
2266 }
2267 break;
2268 }
2269 case TK_A_NAME:
2270 {
2271 const char *name = &rules->buf[cur->key.value_off];
2272 char name_str[UTIL_PATH_SIZE];
2273 int count;
2274
2275 if (event->name_final)
2276 break;
2277 if (cur->key.op == OP_ASSIGN_FINAL)
2278 event->name_final = 1;
2279 if (name[0] == '\0') {
2280 free(event->name);
2281 event->name = NULL;
2282 break;
2283 }
2284 util_strlcpy(name_str, name, sizeof(name_str));
2285 udev_event_apply_format(event, name_str, sizeof(name_str));
2286 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2287 count = util_replace_chars(name_str, ALLOWED_CHARS_FILE);
2288 if (count > 0)
2289 info(event->udev, "%i character(s) replaced\n", count);
2290 free(event->name);
2291 event->name = strdup(name_str);
2292 info(event->udev, "NAME '%s' %s:%u\n",
2293 event->name,
2294 &rules->buf[rule->rule.filename_off],
2295 rule->rule.filename_line);
2296 }
2297 break;
2298 }
2299 case TK_A_DEVLINK:
2300 {
2301 char temp[UTIL_PATH_SIZE];
2302 char filename[UTIL_PATH_SIZE];
2303 char *pos, *next;
2304 int count = 0;
2305
2306 if (event->devlink_final)
2307 break;
2308 if (major(udev_device_get_devnum(event->dev)) == 0)
2309 break;
2310 if (cur->key.op == OP_ASSIGN_FINAL)
2311 event->devlink_final = 1;
2312 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2313 udev_device_cleanup_devlinks_list(event->dev);
2314
2315 /* allow multiple symlinks separated by spaces */
2316 util_strlcpy(temp, &rules->buf[cur->key.value_off], sizeof(temp));
2317 udev_event_apply_format(event, temp, sizeof(temp));
2318 if (esc == ESCAPE_UNSET)
2319 count = util_replace_chars(temp, ALLOWED_CHARS_FILE " ");
2320 else if (esc == ESCAPE_REPLACE)
2321 count = util_replace_chars(temp, ALLOWED_CHARS_FILE);
2322 if (count > 0)
2323 info(event->udev, "%i character(s) replaced\n" , count);
2324 dbg(event->udev, "rule applied, added symlink(s) '%s'\n", temp);
2325 pos = temp;
2326 while (isspace(pos[0]))
2327 pos++;
2328 next = strchr(pos, ' ');
2329 while (next) {
2330 next[0] = '\0';
2331 info(event->udev, "LINK '%s' %s:%u\n",
2332 pos,
2333 &rules->buf[rule->rule.filename_off],
2334 rule->rule.filename_line);
2335 util_strlcpy(filename, udev_get_dev_path(event->udev), sizeof(filename));
2336 util_strlcat(filename, "/", sizeof(filename));
2337 util_strlcat(filename, pos, sizeof(filename));
2338 udev_device_add_devlink(event->dev, filename);
2339 while (isspace(next[1]))
2340 next++;
2341 pos = &next[1];
2342 next = strchr(pos, ' ');
2343 }
2344 if (pos[0] != '\0') {
2345 info(event->udev, "LINK '%s' %s:%u\n",
2346 pos,
2347 &rules->buf[rule->rule.filename_off],
2348 rule->rule.filename_line);
2349 util_strlcpy(filename, udev_get_dev_path(event->udev), sizeof(filename));
2350 util_strlcat(filename, "/", sizeof(filename));
2351 util_strlcat(filename, pos, sizeof(filename));
2352 udev_device_add_devlink(event->dev, filename);
2353 }
2354 }
2355 break;
2356 case TK_A_EVENT_TIMEOUT:
2357 udev_device_set_event_timeout(event->dev, cur->key.event_timeout);
2358 break;
2359 case TK_A_IGNORE_REMOVE:
2360 udev_device_set_ignore_remove(event->dev, 1);
2361 break;
2362 case TK_A_ATTR:
2363 {
2364 const char *key_name = &rules->buf[cur->key.attr_off];
2365 char attr[UTIL_PATH_SIZE];
2366 char value[UTIL_NAME_SIZE];
2367 FILE *f;
2368
2369 util_strlcpy(attr, key_name, sizeof(attr));
2370 if (util_resolve_subsys_kernel(event->udev, key_name, attr, sizeof(attr), 0) != 0) {
2371 util_strlcpy(attr, udev_device_get_syspath(event->dev), sizeof(attr));
2372 util_strlcat(attr, "/", sizeof(attr));
2373 util_strlcat(attr, key_name, sizeof(attr));
2374 }
2375
2376 attr_subst_subdir(attr, sizeof(attr));
2377
2378 util_strlcpy(value, &rules->buf[cur->key.value_off], sizeof(value));
2379 udev_event_apply_format(event, value, sizeof(value));
2380 info(event->udev, "ATTR '%s' writing '%s' %s:%u\n", attr, value,
2381 &rules->buf[rule->rule.filename_off],
2382 rule->rule.filename_line);
2383 f = fopen(attr, "w");
2384 if (f != NULL) {
2385 if (!event->test)
2386 if (fprintf(f, "%s", value) <= 0)
2387 err(event->udev, "error writing ATTR{%s}: %m\n", attr);
2388 fclose(f);
2389 } else {
2390 err(event->udev, "error opening ATTR{%s} for writing: %m\n", attr);
2391 }
2392 break;
2393 }
2394 case TK_A_RUN:
2395 {
2396 struct udev_list_entry *list_entry;
2397
2398 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2399 udev_list_cleanup_entries(event->udev, &event->run_list);
2400 info(event->udev, "RUN '%s' %s:%u\n",
2401 &rules->buf[cur->key.value_off],
2402 &rules->buf[rule->rule.filename_off],
2403 rule->rule.filename_line);
2404 list_entry = udev_list_entry_add(event->udev, &event->run_list,
2405 &rules->buf[cur->key.value_off], NULL, 1, 0);
2406 if (cur->key.ignore_error)
2407 udev_list_entry_set_flag(list_entry, 1);
2408 break;
2409 }
2410 case TK_A_GOTO:
2411 cur = &rules->tokens[cur->key.rule_goto];
2412 continue;
2413 case TK_A_LAST_RULE:
2414 case TK_END:
2415 return 0;
2416
2417 case TK_M_PARENTS_MIN:
2418 case TK_M_PARENTS_MAX:
2419 case TK_M_MAX:
2420 case TK_UNSET:
2421 err(rules->udev, "wrong type %u\n", cur->type);
2422 goto nomatch;
2423 }
2424
2425 cur++;
2426 continue;
2427 nomatch:
2428 /* fast-forward to next rule */
2429 idx = rule->rule.next_rule;
2430 if (idx == 0)
2431 return 0;
2432 dbg(rules->udev, "forward to rule: %u\n", idx);
2433 cur = &rules->tokens[idx];
2434 }
2435 }
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