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[thirdparty/systemd.git] / src / udev / udev-rules.c
1 /* SPDX-License-Identifier: GPL-2.0+ */
2
3 #include <ctype.h>
4 #include <errno.h>
5 #include <fcntl.h>
6 #include <fnmatch.h>
7 #include <limits.h>
8 #include <stdbool.h>
9 #include <stddef.h>
10 #include <stdio.h>
11 #include <stdlib.h>
12 #include <string.h>
13 #include <time.h>
14 #include <unistd.h>
15
16 #include "alloc-util.h"
17 #include "conf-files.h"
18 #include "device-private.h"
19 #include "device-util.h"
20 #include "dirent-util.h"
21 #include "escape.h"
22 #include "fd-util.h"
23 #include "fileio.h"
24 #include "fs-util.h"
25 #include "glob-util.h"
26 #include "libudev-util.h"
27 #include "mkdir.h"
28 #include "path-util.h"
29 #include "proc-cmdline.h"
30 #include "stat-util.h"
31 #include "stdio-util.h"
32 #include "strbuf.h"
33 #include "string-util.h"
34 #include "strv.h"
35 #include "strxcpyx.h"
36 #include "sysctl-util.h"
37 #include "udev-builtin.h"
38 #include "udev.h"
39 #include "user-util.h"
40 #include "util.h"
41
42 #define PREALLOC_TOKEN 2048
43
44 struct uid_gid {
45 unsigned name_off;
46 union {
47 uid_t uid;
48 gid_t gid;
49 };
50 };
51
52 static const char* const rules_dirs[] = {
53 "/etc/udev/rules.d",
54 "/run/udev/rules.d",
55 UDEVLIBEXECDIR "/rules.d",
56 NULL
57 };
58
59 struct udev_rules {
60 usec_t dirs_ts_usec;
61 ResolveNameTiming resolve_name_timing;
62
63 /* every key in the rules file becomes a token */
64 struct token *tokens;
65 unsigned token_cur;
66 unsigned token_max;
67
68 /* all key strings are copied and de-duplicated in a single continuous string buffer */
69 struct strbuf *strbuf;
70
71 /* during rule parsing, uid/gid lookup results are cached */
72 struct uid_gid *uids;
73 unsigned uids_cur;
74 unsigned uids_max;
75 struct uid_gid *gids;
76 unsigned gids_cur;
77 unsigned gids_max;
78 };
79
80 static char *rules_str(struct udev_rules *rules, unsigned off) {
81 return rules->strbuf->buf + off;
82 }
83
84 static unsigned rules_add_string(struct udev_rules *rules, const char *s) {
85 return strbuf_add_string(rules->strbuf, s, strlen(s));
86 }
87
88 /* KEY=="", KEY!="", KEY+="", KEY-="", KEY="", KEY:="" */
89 enum operation_type {
90 OP_UNSET,
91
92 OP_MATCH,
93 OP_NOMATCH,
94 OP_MATCH_MAX,
95
96 OP_ADD,
97 OP_REMOVE,
98 OP_ASSIGN,
99 OP_ASSIGN_FINAL,
100 };
101
102 enum string_glob_type {
103 GL_UNSET,
104 GL_PLAIN, /* no special chars */
105 GL_GLOB, /* shell globs ?,*,[] */
106 GL_SPLIT, /* multi-value A|B */
107 GL_SPLIT_GLOB, /* multi-value with glob A*|B* */
108 GL_SOMETHING, /* commonly used "?*" */
109 };
110
111 enum string_subst_type {
112 SB_UNSET,
113 SB_NONE,
114 SB_FORMAT,
115 SB_SUBSYS,
116 };
117
118 /* tokens of a rule are sorted/handled in this order */
119 enum token_type {
120 TK_UNSET,
121 TK_RULE,
122
123 TK_M_ACTION, /* val */
124 TK_M_DEVPATH, /* val */
125 TK_M_KERNEL, /* val */
126 TK_M_DEVLINK, /* val */
127 TK_M_NAME, /* val */
128 TK_M_ENV, /* val, attr */
129 TK_M_TAG, /* val */
130 TK_M_SUBSYSTEM, /* val */
131 TK_M_DRIVER, /* val */
132 TK_M_WAITFOR, /* val */
133 TK_M_ATTR, /* val, attr */
134 TK_M_SYSCTL, /* val, attr */
135
136 TK_M_PARENTS_MIN,
137 TK_M_KERNELS, /* val */
138 TK_M_SUBSYSTEMS, /* val */
139 TK_M_DRIVERS, /* val */
140 TK_M_ATTRS, /* val, attr */
141 TK_M_TAGS, /* val */
142 TK_M_PARENTS_MAX,
143
144 TK_M_TEST, /* val, mode_t */
145 TK_M_PROGRAM, /* val */
146 TK_M_IMPORT_FILE, /* val */
147 TK_M_IMPORT_PROG, /* val */
148 TK_M_IMPORT_BUILTIN, /* val */
149 TK_M_IMPORT_DB, /* val */
150 TK_M_IMPORT_CMDLINE, /* val */
151 TK_M_IMPORT_PARENT, /* val */
152 TK_M_RESULT, /* val */
153 TK_M_MAX,
154
155 TK_A_STRING_ESCAPE_NONE,
156 TK_A_STRING_ESCAPE_REPLACE,
157 TK_A_DB_PERSIST,
158 TK_A_INOTIFY_WATCH, /* int */
159 TK_A_DEVLINK_PRIO, /* int */
160 TK_A_OWNER, /* val */
161 TK_A_GROUP, /* val */
162 TK_A_MODE, /* val */
163 TK_A_OWNER_ID, /* uid_t */
164 TK_A_GROUP_ID, /* gid_t */
165 TK_A_MODE_ID, /* mode_t */
166 TK_A_TAG, /* val */
167 TK_A_STATIC_NODE, /* val */
168 TK_A_SECLABEL, /* val, attr */
169 TK_A_ENV, /* val, attr */
170 TK_A_NAME, /* val */
171 TK_A_DEVLINK, /* val */
172 TK_A_ATTR, /* val, attr */
173 TK_A_SYSCTL, /* val, attr */
174 TK_A_RUN_BUILTIN, /* val, bool */
175 TK_A_RUN_PROGRAM, /* val, bool */
176 TK_A_GOTO, /* size_t */
177
178 TK_END,
179 };
180
181 /* we try to pack stuff in a way that we take only 12 bytes per token */
182 struct token {
183 union {
184 unsigned char type; /* same in rule and key */
185 struct {
186 enum token_type type:8;
187 bool can_set_name:1;
188 bool has_static_node:1;
189 unsigned unused:6;
190 unsigned short token_count;
191 unsigned label_off;
192 unsigned short filename_off;
193 unsigned short filename_line;
194 } rule;
195 struct {
196 enum token_type type:8;
197 enum operation_type op:8;
198 enum string_glob_type glob:8;
199 enum string_subst_type subst:4;
200 enum string_subst_type attrsubst:4;
201 unsigned value_off;
202 union {
203 unsigned attr_off;
204 unsigned rule_goto;
205 mode_t mode;
206 uid_t uid;
207 gid_t gid;
208 int devlink_prio;
209 int watch;
210 enum udev_builtin_cmd builtin_cmd;
211 };
212 } key;
213 };
214 };
215
216 #define MAX_TK 64
217 struct rule_tmp {
218 struct udev_rules *rules;
219 struct token rule;
220 struct token token[MAX_TK];
221 unsigned token_cur;
222 };
223
224 #ifdef DEBUG
225 static const char *operation_str(enum operation_type type) {
226 static const char *operation_strs[] = {
227 [OP_UNSET] = "UNSET",
228 [OP_MATCH] = "match",
229 [OP_NOMATCH] = "nomatch",
230 [OP_MATCH_MAX] = "MATCH_MAX",
231
232 [OP_ADD] = "add",
233 [OP_REMOVE] = "remove",
234 [OP_ASSIGN] = "assign",
235 [OP_ASSIGN_FINAL] = "assign-final",
236 } ;
237
238 return operation_strs[type];
239 }
240
241 static const char *string_glob_str(enum string_glob_type type) {
242 static const char *string_glob_strs[] = {
243 [GL_UNSET] = "UNSET",
244 [GL_PLAIN] = "plain",
245 [GL_GLOB] = "glob",
246 [GL_SPLIT] = "split",
247 [GL_SPLIT_GLOB] = "split-glob",
248 [GL_SOMETHING] = "split-glob",
249 };
250
251 return string_glob_strs[type];
252 }
253
254 static const char *token_str(enum token_type type) {
255 static const char *token_strs[] = {
256 [TK_UNSET] = "UNSET",
257 [TK_RULE] = "RULE",
258
259 [TK_M_ACTION] = "M ACTION",
260 [TK_M_DEVPATH] = "M DEVPATH",
261 [TK_M_KERNEL] = "M KERNEL",
262 [TK_M_DEVLINK] = "M DEVLINK",
263 [TK_M_NAME] = "M NAME",
264 [TK_M_ENV] = "M ENV",
265 [TK_M_TAG] = "M TAG",
266 [TK_M_SUBSYSTEM] = "M SUBSYSTEM",
267 [TK_M_DRIVER] = "M DRIVER",
268 [TK_M_WAITFOR] = "M WAITFOR",
269 [TK_M_ATTR] = "M ATTR",
270 [TK_M_SYSCTL] = "M SYSCTL",
271
272 [TK_M_PARENTS_MIN] = "M PARENTS_MIN",
273 [TK_M_KERNELS] = "M KERNELS",
274 [TK_M_SUBSYSTEMS] = "M SUBSYSTEMS",
275 [TK_M_DRIVERS] = "M DRIVERS",
276 [TK_M_ATTRS] = "M ATTRS",
277 [TK_M_TAGS] = "M TAGS",
278 [TK_M_PARENTS_MAX] = "M PARENTS_MAX",
279
280 [TK_M_TEST] = "M TEST",
281 [TK_M_PROGRAM] = "M PROGRAM",
282 [TK_M_IMPORT_FILE] = "M IMPORT_FILE",
283 [TK_M_IMPORT_PROG] = "M IMPORT_PROG",
284 [TK_M_IMPORT_BUILTIN] = "M IMPORT_BUILTIN",
285 [TK_M_IMPORT_DB] = "M IMPORT_DB",
286 [TK_M_IMPORT_CMDLINE] = "M IMPORT_CMDLINE",
287 [TK_M_IMPORT_PARENT] = "M IMPORT_PARENT",
288 [TK_M_RESULT] = "M RESULT",
289 [TK_M_MAX] = "M MAX",
290
291 [TK_A_STRING_ESCAPE_NONE] = "A STRING_ESCAPE_NONE",
292 [TK_A_STRING_ESCAPE_REPLACE] = "A STRING_ESCAPE_REPLACE",
293 [TK_A_DB_PERSIST] = "A DB_PERSIST",
294 [TK_A_INOTIFY_WATCH] = "A INOTIFY_WATCH",
295 [TK_A_DEVLINK_PRIO] = "A DEVLINK_PRIO",
296 [TK_A_OWNER] = "A OWNER",
297 [TK_A_GROUP] = "A GROUP",
298 [TK_A_MODE] = "A MODE",
299 [TK_A_OWNER_ID] = "A OWNER_ID",
300 [TK_A_GROUP_ID] = "A GROUP_ID",
301 [TK_A_STATIC_NODE] = "A STATIC_NODE",
302 [TK_A_SECLABEL] = "A SECLABEL",
303 [TK_A_MODE_ID] = "A MODE_ID",
304 [TK_A_ENV] = "A ENV",
305 [TK_A_TAG] = "A ENV",
306 [TK_A_NAME] = "A NAME",
307 [TK_A_DEVLINK] = "A DEVLINK",
308 [TK_A_ATTR] = "A ATTR",
309 [TK_A_SYSCTL] = "A SYSCTL",
310 [TK_A_RUN_BUILTIN] = "A RUN_BUILTIN",
311 [TK_A_RUN_PROGRAM] = "A RUN_PROGRAM",
312 [TK_A_GOTO] = "A GOTO",
313
314 [TK_END] = "END",
315 };
316
317 return token_strs[type];
318 }
319
320 static void dump_token(struct udev_rules *rules, struct token *token) {
321 enum token_type type = token->type;
322 enum operation_type op = token->key.op;
323 enum string_glob_type glob = token->key.glob;
324 const char *value = rules_str(rules, token->key.value_off);
325 const char *attr = &rules->strbuf->buf[token->key.attr_off];
326
327 switch (type) {
328 case TK_RULE:
329 {
330 const char *tks_ptr = (char *)rules->tokens;
331 const char *tk_ptr = (char *)token;
332 unsigned idx = (tk_ptr - tks_ptr) / sizeof(struct token);
333
334 log_debug("* RULE %s:%u, token: %u, count: %u, label: '%s'",
335 &rules->strbuf->buf[token->rule.filename_off], token->rule.filename_line,
336 idx, token->rule.token_count,
337 &rules->strbuf->buf[token->rule.label_off]);
338 break;
339 }
340 case TK_M_ACTION:
341 case TK_M_DEVPATH:
342 case TK_M_KERNEL:
343 case TK_M_SUBSYSTEM:
344 case TK_M_DRIVER:
345 case TK_M_WAITFOR:
346 case TK_M_DEVLINK:
347 case TK_M_NAME:
348 case TK_M_KERNELS:
349 case TK_M_SUBSYSTEMS:
350 case TK_M_DRIVERS:
351 case TK_M_TAGS:
352 case TK_M_PROGRAM:
353 case TK_M_IMPORT_FILE:
354 case TK_M_IMPORT_PROG:
355 case TK_M_IMPORT_DB:
356 case TK_M_IMPORT_CMDLINE:
357 case TK_M_IMPORT_PARENT:
358 case TK_M_RESULT:
359 case TK_A_NAME:
360 case TK_A_DEVLINK:
361 case TK_A_OWNER:
362 case TK_A_GROUP:
363 case TK_A_MODE:
364 case TK_A_RUN_BUILTIN:
365 case TK_A_RUN_PROGRAM:
366 log_debug("%s %s '%s'(%s)",
367 token_str(type), operation_str(op), value, string_glob_str(glob));
368 break;
369 case TK_M_IMPORT_BUILTIN:
370 log_debug("%s %i '%s'", token_str(type), token->key.builtin_cmd, value);
371 break;
372 case TK_M_ATTR:
373 case TK_M_SYSCTL:
374 case TK_M_ATTRS:
375 case TK_M_ENV:
376 case TK_A_ATTR:
377 case TK_A_SYSCTL:
378 case TK_A_ENV:
379 log_debug("%s %s '%s' '%s'(%s)",
380 token_str(type), operation_str(op), attr, value, string_glob_str(glob));
381 break;
382 case TK_M_TAG:
383 case TK_A_TAG:
384 log_debug("%s %s '%s'", token_str(type), operation_str(op), value);
385 break;
386 case TK_A_STRING_ESCAPE_NONE:
387 case TK_A_STRING_ESCAPE_REPLACE:
388 case TK_A_DB_PERSIST:
389 log_debug("%s", token_str(type));
390 break;
391 case TK_M_TEST:
392 log_debug("%s %s '%s'(%s) %#o",
393 token_str(type), operation_str(op), value, string_glob_str(glob), token->key.mode);
394 break;
395 case TK_A_INOTIFY_WATCH:
396 log_debug("%s %u", token_str(type), token->key.watch);
397 break;
398 case TK_A_DEVLINK_PRIO:
399 log_debug("%s %u", token_str(type), token->key.devlink_prio);
400 break;
401 case TK_A_OWNER_ID:
402 log_debug("%s %s %u", token_str(type), operation_str(op), token->key.uid);
403 break;
404 case TK_A_GROUP_ID:
405 log_debug("%s %s %u", token_str(type), operation_str(op), token->key.gid);
406 break;
407 case TK_A_MODE_ID:
408 log_debug("%s %s %#o", token_str(type), operation_str(op), token->key.mode);
409 break;
410 case TK_A_STATIC_NODE:
411 log_debug("%s '%s'", token_str(type), value);
412 break;
413 case TK_A_SECLABEL:
414 log_debug("%s %s '%s' '%s'", token_str(type), operation_str(op), attr, value);
415 break;
416 case TK_A_GOTO:
417 log_debug("%s '%s' %u", token_str(type), value, token->key.rule_goto);
418 break;
419 case TK_END:
420 log_debug("* %s", token_str(type));
421 break;
422 case TK_M_PARENTS_MIN:
423 case TK_M_PARENTS_MAX:
424 case TK_M_MAX:
425 case TK_UNSET:
426 log_debug("unknown type %u", type);
427 break;
428 }
429 }
430
431 static void dump_rules(struct udev_rules *rules) {
432 unsigned i;
433
434 log_debug("dumping %u (%zu bytes) tokens, %zu (%zu bytes) strings",
435 rules->token_cur,
436 rules->token_cur * sizeof(struct token),
437 rules->strbuf->nodes_count,
438 rules->strbuf->len);
439 for (i = 0; i < rules->token_cur; i++)
440 dump_token(rules, &rules->tokens[i]);
441 }
442 #else
443 static inline void dump_token(struct udev_rules *rules, struct token *token) {}
444 static inline void dump_rules(struct udev_rules *rules) {}
445 #endif /* DEBUG */
446
447 static int add_token(struct udev_rules *rules, struct token *token) {
448 /* grow buffer if needed */
449 if (rules->token_cur+1 >= rules->token_max) {
450 struct token *tokens;
451 unsigned add;
452
453 /* double the buffer size */
454 add = rules->token_max;
455 if (add < 8)
456 add = 8;
457
458 tokens = reallocarray(rules->tokens, rules->token_max + add, sizeof(struct token));
459 if (tokens == NULL)
460 return -1;
461 rules->tokens = tokens;
462 rules->token_max += add;
463 }
464 memcpy(&rules->tokens[rules->token_cur], token, sizeof(struct token));
465 rules->token_cur++;
466 return 0;
467 }
468
469 static void log_unknown_owner(int error, const char *entity, const char *owner) {
470 if (IN_SET(abs(error), ENOENT, ESRCH))
471 log_error("Specified %s '%s' unknown", entity, owner);
472 else
473 log_error_errno(error, "Error resolving %s '%s': %m", entity, owner);
474 }
475
476 static uid_t add_uid(struct udev_rules *rules, const char *owner) {
477 unsigned i;
478 uid_t uid = 0;
479 unsigned off;
480 int r;
481
482 /* lookup, if we know it already */
483 for (i = 0; i < rules->uids_cur; i++) {
484 off = rules->uids[i].name_off;
485 if (streq(rules_str(rules, off), owner)) {
486 uid = rules->uids[i].uid;
487 return uid;
488 }
489 }
490 r = get_user_creds(&owner, &uid, NULL, NULL, NULL, USER_CREDS_ALLOW_MISSING);
491 if (r < 0)
492 log_unknown_owner(r, "user", owner);
493
494 /* grow buffer if needed */
495 if (rules->uids_cur+1 >= rules->uids_max) {
496 struct uid_gid *uids;
497 unsigned add;
498
499 /* double the buffer size */
500 add = rules->uids_max;
501 if (add < 1)
502 add = 8;
503
504 uids = reallocarray(rules->uids, rules->uids_max + add, sizeof(struct uid_gid));
505 if (uids == NULL)
506 return uid;
507 rules->uids = uids;
508 rules->uids_max += add;
509 }
510 rules->uids[rules->uids_cur].uid = uid;
511 off = rules_add_string(rules, owner);
512 if (off <= 0)
513 return uid;
514 rules->uids[rules->uids_cur].name_off = off;
515 rules->uids_cur++;
516 return uid;
517 }
518
519 static gid_t add_gid(struct udev_rules *rules, const char *group) {
520 unsigned i;
521 gid_t gid = 0;
522 unsigned off;
523 int r;
524
525 /* lookup, if we know it already */
526 for (i = 0; i < rules->gids_cur; i++) {
527 off = rules->gids[i].name_off;
528 if (streq(rules_str(rules, off), group)) {
529 gid = rules->gids[i].gid;
530 return gid;
531 }
532 }
533 r = get_group_creds(&group, &gid, USER_CREDS_ALLOW_MISSING);
534 if (r < 0)
535 log_unknown_owner(r, "group", group);
536
537 /* grow buffer if needed */
538 if (rules->gids_cur+1 >= rules->gids_max) {
539 struct uid_gid *gids;
540 unsigned add;
541
542 /* double the buffer size */
543 add = rules->gids_max;
544 if (add < 1)
545 add = 8;
546
547 gids = reallocarray(rules->gids, rules->gids_max + add, sizeof(struct uid_gid));
548 if (gids == NULL)
549 return gid;
550 rules->gids = gids;
551 rules->gids_max += add;
552 }
553 rules->gids[rules->gids_cur].gid = gid;
554 off = rules_add_string(rules, group);
555 if (off <= 0)
556 return gid;
557 rules->gids[rules->gids_cur].name_off = off;
558 rules->gids_cur++;
559 return gid;
560 }
561
562 static int import_property_from_string(sd_device *dev, char *line) {
563 char *key;
564 char *val;
565 size_t len;
566
567 /* find key */
568 key = line;
569 while (isspace(key[0]))
570 key++;
571
572 /* comment or empty line */
573 if (IN_SET(key[0], '#', '\0'))
574 return 0;
575
576 /* split key/value */
577 val = strchr(key, '=');
578 if (!val)
579 return -EINVAL;
580 val[0] = '\0';
581 val++;
582
583 /* find value */
584 while (isspace(val[0]))
585 val++;
586
587 /* terminate key */
588 len = strlen(key);
589 if (len == 0)
590 return -EINVAL;
591 while (isspace(key[len-1]))
592 len--;
593 key[len] = '\0';
594
595 /* terminate value */
596 len = strlen(val);
597 if (len == 0)
598 return -EINVAL;
599 while (isspace(val[len-1]))
600 len--;
601 val[len] = '\0';
602
603 if (len == 0)
604 return -EINVAL;
605
606 /* unquote */
607 if (IN_SET(val[0], '"', '\'')) {
608 if (len == 1 || val[len-1] != val[0]) {
609 log_debug("inconsistent quoting: '%s', skip", line);
610 return -EINVAL;
611 }
612 val[len-1] = '\0';
613 val++;
614 }
615
616 return device_add_property(dev, key, val);
617 }
618
619 static int import_file_into_properties(sd_device *dev, const char *filename) {
620 _cleanup_fclose_ FILE *f = NULL;
621 int r;
622
623 f = fopen(filename, "re");
624 if (!f)
625 return -errno;
626
627 for (;;) {
628 _cleanup_free_ char *line = NULL;
629
630 r = read_line(f, LONG_LINE_MAX, &line);
631 if (r < 0)
632 return r;
633 if (r == 0)
634 break;
635
636 (void) import_property_from_string(dev, line);
637 }
638
639 return 0;
640 }
641
642 static int import_program_into_properties(struct udev_event *event,
643 usec_t timeout_usec,
644 const char *program) {
645 char result[UTIL_LINE_SIZE];
646 char *line;
647 int err;
648
649 err = udev_event_spawn(event, timeout_usec, true, program, result, sizeof(result));
650 if (err < 0)
651 return err;
652
653 line = result;
654 while (line != NULL) {
655 char *pos;
656
657 pos = strchr(line, '\n');
658 if (pos != NULL) {
659 pos[0] = '\0';
660 pos = &pos[1];
661 }
662 (void) import_property_from_string(event->dev, line);
663 line = pos;
664 }
665 return 0;
666 }
667
668 static int import_parent_into_properties(sd_device *dev, const char *filter) {
669 const char *key, *val;
670 sd_device *parent;
671 int r;
672
673 assert(dev);
674 assert(filter);
675
676 r = sd_device_get_parent(dev, &parent);
677 if (r < 0)
678 return r;
679
680 FOREACH_DEVICE_PROPERTY(parent, key, val)
681 if (fnmatch(filter, key, 0) == 0)
682 device_add_property(dev, key, val);
683 return 0;
684 }
685
686 static void attr_subst_subdir(char *attr, size_t len) {
687 const char *pos, *tail, *path;
688 _cleanup_closedir_ DIR *dir = NULL;
689 struct dirent *dent;
690
691 pos = strstr(attr, "/*/");
692 if (!pos)
693 return;
694
695 tail = pos + 2;
696 path = strndupa(attr, pos - attr + 1); /* include slash at end */
697 dir = opendir(path);
698 if (dir == NULL)
699 return;
700
701 FOREACH_DIRENT_ALL(dent, dir, break)
702 if (dent->d_name[0] != '.') {
703 char n[strlen(dent->d_name) + strlen(tail) + 1];
704
705 strscpyl(n, sizeof n, dent->d_name, tail, NULL);
706 if (faccessat(dirfd(dir), n, F_OK, 0) == 0) {
707 strscpyl(attr, len, path, n, NULL);
708 break;
709 }
710 }
711 }
712
713 static int get_key(char **line, char **key, enum operation_type *op, char **value) {
714 char *linepos;
715 char *temp;
716 unsigned i, j;
717
718 linepos = *line;
719 if (linepos == NULL || linepos[0] == '\0')
720 return -1;
721
722 /* skip whitespace */
723 while (isspace(linepos[0]) || linepos[0] == ',')
724 linepos++;
725
726 /* get the key */
727 if (linepos[0] == '\0')
728 return -1;
729 *key = linepos;
730
731 for (;;) {
732 linepos++;
733 if (linepos[0] == '\0')
734 return -1;
735 if (isspace(linepos[0]))
736 break;
737 if (linepos[0] == '=')
738 break;
739 if (IN_SET(linepos[0], '+', '-', '!', ':'))
740 if (linepos[1] == '=')
741 break;
742 }
743
744 /* remember end of key */
745 temp = linepos;
746
747 /* skip whitespace after key */
748 while (isspace(linepos[0]))
749 linepos++;
750 if (linepos[0] == '\0')
751 return -1;
752
753 /* get operation type */
754 if (linepos[0] == '=' && linepos[1] == '=') {
755 *op = OP_MATCH;
756 linepos += 2;
757 } else if (linepos[0] == '!' && linepos[1] == '=') {
758 *op = OP_NOMATCH;
759 linepos += 2;
760 } else if (linepos[0] == '+' && linepos[1] == '=') {
761 *op = OP_ADD;
762 linepos += 2;
763 } else if (linepos[0] == '-' && linepos[1] == '=') {
764 *op = OP_REMOVE;
765 linepos += 2;
766 } else if (linepos[0] == '=') {
767 *op = OP_ASSIGN;
768 linepos++;
769 } else if (linepos[0] == ':' && linepos[1] == '=') {
770 *op = OP_ASSIGN_FINAL;
771 linepos += 2;
772 } else
773 return -1;
774
775 /* terminate key */
776 temp[0] = '\0';
777
778 /* skip whitespace after operator */
779 while (isspace(linepos[0]))
780 linepos++;
781 if (linepos[0] == '\0')
782 return -1;
783
784 /* get the value */
785 if (linepos[0] == '"')
786 linepos++;
787 else
788 return -1;
789 *value = linepos;
790
791 /* terminate */
792 for (i = 0, j = 0; ; i++, j++) {
793
794 if (linepos[i] == '"')
795 break;
796
797 if (linepos[i] == '\0')
798 return -1;
799
800 /* double quotes can be escaped */
801 if (linepos[i] == '\\')
802 if (linepos[i+1] == '"')
803 i++;
804
805 linepos[j] = linepos[i];
806 }
807 linepos[j] = '\0';
808
809 /* move line to next key */
810 *line = linepos + i + 1;
811 return 0;
812 }
813
814 /* extract possible KEY{attr} */
815 static const char *get_key_attribute(char *str) {
816 char *pos;
817 char *attr;
818
819 attr = strchr(str, '{');
820 if (attr != NULL) {
821 attr++;
822 pos = strchr(attr, '}');
823 if (pos == NULL) {
824 log_error("Missing closing brace for format");
825 return NULL;
826 }
827 pos[0] = '\0';
828 return attr;
829 }
830 return NULL;
831 }
832
833 static void rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
834 enum operation_type op,
835 const char *value, const void *data) {
836 struct token *token = rule_tmp->token + rule_tmp->token_cur;
837 const char *attr = NULL;
838
839 assert(rule_tmp->token_cur < ELEMENTSOF(rule_tmp->token));
840 memzero(token, sizeof(struct token));
841
842 switch (type) {
843 case TK_M_ACTION:
844 case TK_M_DEVPATH:
845 case TK_M_KERNEL:
846 case TK_M_SUBSYSTEM:
847 case TK_M_DRIVER:
848 case TK_M_WAITFOR:
849 case TK_M_DEVLINK:
850 case TK_M_NAME:
851 case TK_M_KERNELS:
852 case TK_M_SUBSYSTEMS:
853 case TK_M_DRIVERS:
854 case TK_M_TAGS:
855 case TK_M_PROGRAM:
856 case TK_M_IMPORT_FILE:
857 case TK_M_IMPORT_PROG:
858 case TK_M_IMPORT_DB:
859 case TK_M_IMPORT_CMDLINE:
860 case TK_M_IMPORT_PARENT:
861 case TK_M_RESULT:
862 case TK_A_OWNER:
863 case TK_A_GROUP:
864 case TK_A_MODE:
865 case TK_A_DEVLINK:
866 case TK_A_NAME:
867 case TK_A_GOTO:
868 case TK_M_TAG:
869 case TK_A_TAG:
870 case TK_A_STATIC_NODE:
871 token->key.value_off = rules_add_string(rule_tmp->rules, value);
872 break;
873 case TK_M_IMPORT_BUILTIN:
874 token->key.value_off = rules_add_string(rule_tmp->rules, value);
875 token->key.builtin_cmd = *(enum udev_builtin_cmd *)data;
876 break;
877 case TK_M_ENV:
878 case TK_M_ATTR:
879 case TK_M_SYSCTL:
880 case TK_M_ATTRS:
881 case TK_A_ATTR:
882 case TK_A_SYSCTL:
883 case TK_A_ENV:
884 case TK_A_SECLABEL:
885 attr = data;
886 token->key.value_off = rules_add_string(rule_tmp->rules, value);
887 token->key.attr_off = rules_add_string(rule_tmp->rules, attr);
888 break;
889 case TK_M_TEST:
890 token->key.value_off = rules_add_string(rule_tmp->rules, value);
891 if (data != NULL)
892 token->key.mode = *(mode_t *)data;
893 break;
894 case TK_A_STRING_ESCAPE_NONE:
895 case TK_A_STRING_ESCAPE_REPLACE:
896 case TK_A_DB_PERSIST:
897 break;
898 case TK_A_RUN_BUILTIN:
899 case TK_A_RUN_PROGRAM:
900 token->key.builtin_cmd = *(enum udev_builtin_cmd *)data;
901 token->key.value_off = rules_add_string(rule_tmp->rules, value);
902 break;
903 case TK_A_INOTIFY_WATCH:
904 case TK_A_DEVLINK_PRIO:
905 token->key.devlink_prio = *(int *)data;
906 break;
907 case TK_A_OWNER_ID:
908 token->key.uid = *(uid_t *)data;
909 break;
910 case TK_A_GROUP_ID:
911 token->key.gid = *(gid_t *)data;
912 break;
913 case TK_A_MODE_ID:
914 token->key.mode = *(mode_t *)data;
915 break;
916 case TK_RULE:
917 case TK_M_PARENTS_MIN:
918 case TK_M_PARENTS_MAX:
919 case TK_M_MAX:
920 case TK_END:
921 case TK_UNSET:
922 assert_not_reached("wrong type");
923 }
924
925 if (value != NULL && type < TK_M_MAX) {
926 /* check if we need to split or call fnmatch() while matching rules */
927 enum string_glob_type glob;
928 int has_split;
929 int has_glob;
930
931 has_split = (strchr(value, '|') != NULL);
932 has_glob = string_is_glob(value);
933 if (has_split && has_glob) {
934 glob = GL_SPLIT_GLOB;
935 } else if (has_split) {
936 glob = GL_SPLIT;
937 } else if (has_glob) {
938 if (streq(value, "?*"))
939 glob = GL_SOMETHING;
940 else
941 glob = GL_GLOB;
942 } else {
943 glob = GL_PLAIN;
944 }
945 token->key.glob = glob;
946 }
947
948 if (value != NULL && type > TK_M_MAX) {
949 /* check if assigned value has substitution chars */
950 if (value[0] == '[')
951 token->key.subst = SB_SUBSYS;
952 else if (strchr(value, '%') != NULL || strchr(value, '$') != NULL)
953 token->key.subst = SB_FORMAT;
954 else
955 token->key.subst = SB_NONE;
956 }
957
958 if (attr != NULL) {
959 /* check if property/attribute name has substitution chars */
960 if (attr[0] == '[')
961 token->key.attrsubst = SB_SUBSYS;
962 else if (strchr(attr, '%') != NULL || strchr(attr, '$') != NULL)
963 token->key.attrsubst = SB_FORMAT;
964 else
965 token->key.attrsubst = SB_NONE;
966 }
967
968 token->key.type = type;
969 token->key.op = op;
970 rule_tmp->token_cur++;
971 }
972
973 static int sort_token(struct udev_rules *rules, struct rule_tmp *rule_tmp) {
974 unsigned i;
975 unsigned start = 0;
976 unsigned end = rule_tmp->token_cur;
977
978 for (i = 0; i < rule_tmp->token_cur; i++) {
979 enum token_type next_val = TK_UNSET;
980 unsigned next_idx = 0;
981 unsigned j;
982
983 /* find smallest value */
984 for (j = start; j < end; j++) {
985 if (rule_tmp->token[j].type == TK_UNSET)
986 continue;
987 if (next_val == TK_UNSET || rule_tmp->token[j].type < next_val) {
988 next_val = rule_tmp->token[j].type;
989 next_idx = j;
990 }
991 }
992
993 /* add token and mark done */
994 if (add_token(rules, &rule_tmp->token[next_idx]) != 0)
995 return -1;
996 rule_tmp->token[next_idx].type = TK_UNSET;
997
998 /* shrink range */
999 if (next_idx == start)
1000 start++;
1001 if (next_idx+1 == end)
1002 end--;
1003 }
1004 return 0;
1005 }
1006
1007 #define LOG_RULE_ERROR(fmt, ...) log_error("Invalid rule %s:%u: " fmt, filename, lineno, ##__VA_ARGS__)
1008 #define LOG_RULE_WARNING(fmt, ...) log_warning("%s:%u: " fmt, filename, lineno, ##__VA_ARGS__)
1009 #define LOG_RULE_DEBUG(fmt, ...) log_debug("%s:%u: " fmt, filename, lineno, ##__VA_ARGS__)
1010 #define LOG_AND_RETURN(fmt, ...) { LOG_RULE_ERROR(fmt, __VA_ARGS__); return; }
1011
1012 static void add_rule(struct udev_rules *rules, char *line,
1013 const char *filename, unsigned filename_off, unsigned lineno) {
1014 char *linepos;
1015 const char *attr;
1016 struct rule_tmp rule_tmp = {
1017 .rules = rules,
1018 .rule.type = TK_RULE,
1019 };
1020
1021 /* the offset in the rule is limited to unsigned short */
1022 if (filename_off < USHRT_MAX)
1023 rule_tmp.rule.rule.filename_off = filename_off;
1024 rule_tmp.rule.rule.filename_line = lineno;
1025
1026 linepos = line;
1027 for (;;) {
1028 char *key;
1029 char *value;
1030 enum operation_type op;
1031
1032 if (get_key(&linepos, &key, &op, &value) != 0) {
1033 /* Avoid erroring on trailing whitespace. This is probably rare
1034 * so save the work for the error case instead of always trying
1035 * to strip the trailing whitespace with strstrip(). */
1036 while (isblank(*linepos))
1037 linepos++;
1038
1039 /* If we aren't at the end of the line, this is a parsing error.
1040 * Make a best effort to describe where the problem is. */
1041 if (!strchr(NEWLINE, *linepos)) {
1042 char buf[2] = {*linepos};
1043 _cleanup_free_ char *tmp;
1044
1045 tmp = cescape(buf);
1046 log_error("invalid key/value pair in file %s on line %u, starting at character %tu ('%s')",
1047 filename, lineno, linepos - line + 1, tmp);
1048 if (*linepos == '#')
1049 log_error("hint: comments can only start at beginning of line");
1050 }
1051 break;
1052 }
1053
1054 if (rule_tmp.token_cur >= ELEMENTSOF(rule_tmp.token))
1055 LOG_AND_RETURN("temporary rule array too small, aborting event processing with %u items", rule_tmp.token_cur);
1056
1057 if (streq(key, "ACTION")) {
1058 if (op > OP_MATCH_MAX)
1059 LOG_AND_RETURN("invalid %s operation", key);
1060
1061 rule_add_key(&rule_tmp, TK_M_ACTION, op, value, NULL);
1062
1063 } else if (streq(key, "DEVPATH")) {
1064 if (op > OP_MATCH_MAX)
1065 LOG_AND_RETURN("invalid %s operation", key);
1066
1067 rule_add_key(&rule_tmp, TK_M_DEVPATH, op, value, NULL);
1068
1069 } else if (streq(key, "KERNEL")) {
1070 if (op > OP_MATCH_MAX)
1071 LOG_AND_RETURN("invalid %s operation", key);
1072
1073 rule_add_key(&rule_tmp, TK_M_KERNEL, op, value, NULL);
1074
1075 } else if (streq(key, "SUBSYSTEM")) {
1076 if (op > OP_MATCH_MAX)
1077 LOG_AND_RETURN("invalid %s operation", key);
1078
1079 /* bus, class, subsystem events should all be the same */
1080 if (STR_IN_SET(value, "subsystem", "bus", "class")) {
1081 if (!streq(value, "subsystem"))
1082 LOG_RULE_WARNING("'%s' must be specified as 'subsystem'; please fix", value);
1083
1084 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, "subsystem|class|bus", NULL);
1085 } else
1086 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, value, NULL);
1087
1088 } else if (streq(key, "DRIVER")) {
1089 if (op > OP_MATCH_MAX)
1090 LOG_AND_RETURN("invalid %s operation", key);
1091
1092 rule_add_key(&rule_tmp, TK_M_DRIVER, op, value, NULL);
1093
1094 } else if (startswith(key, "ATTR{")) {
1095 attr = get_key_attribute(key + STRLEN("ATTR"));
1096 if (attr == NULL)
1097 LOG_AND_RETURN("error parsing %s attribute", "ATTR");
1098
1099 if (op == OP_REMOVE)
1100 LOG_AND_RETURN("invalid %s operation", "ATTR");
1101
1102 if (op < OP_MATCH_MAX)
1103 rule_add_key(&rule_tmp, TK_M_ATTR, op, value, attr);
1104 else
1105 rule_add_key(&rule_tmp, TK_A_ATTR, op, value, attr);
1106
1107 } else if (startswith(key, "SYSCTL{")) {
1108 attr = get_key_attribute(key + STRLEN("SYSCTL"));
1109 if (attr == NULL)
1110 LOG_AND_RETURN("error parsing %s attribute", "ATTR");
1111
1112 if (op == OP_REMOVE)
1113 LOG_AND_RETURN("invalid %s operation", "ATTR");
1114
1115 if (op < OP_MATCH_MAX)
1116 rule_add_key(&rule_tmp, TK_M_SYSCTL, op, value, attr);
1117 else
1118 rule_add_key(&rule_tmp, TK_A_SYSCTL, op, value, attr);
1119
1120 } else if (startswith(key, "SECLABEL{")) {
1121 attr = get_key_attribute(key + STRLEN("SECLABEL"));
1122 if (attr == NULL)
1123 LOG_AND_RETURN("error parsing %s attribute", "SECLABEL");
1124
1125 if (op == OP_REMOVE)
1126 LOG_AND_RETURN("invalid %s operation", "SECLABEL");
1127
1128 rule_add_key(&rule_tmp, TK_A_SECLABEL, op, value, attr);
1129
1130 } else if (streq(key, "KERNELS")) {
1131 if (op > OP_MATCH_MAX)
1132 LOG_AND_RETURN("invalid %s operation", key);
1133
1134 rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1135
1136 } else if (streq(key, "SUBSYSTEMS")) {
1137 if (op > OP_MATCH_MAX)
1138 LOG_AND_RETURN("invalid %s operation", key);
1139
1140 rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1141
1142 } else if (streq(key, "DRIVERS")) {
1143 if (op > OP_MATCH_MAX)
1144 LOG_AND_RETURN("invalid %s operation", key);
1145
1146 rule_add_key(&rule_tmp, TK_M_DRIVERS, op, value, NULL);
1147
1148 } else if (startswith(key, "ATTRS{")) {
1149 if (op > OP_MATCH_MAX)
1150 LOG_AND_RETURN("invalid %s operation", "ATTRS");
1151
1152 attr = get_key_attribute(key + STRLEN("ATTRS"));
1153 if (attr == NULL)
1154 LOG_AND_RETURN("error parsing %s attribute", "ATTRS");
1155
1156 if (startswith(attr, "device/"))
1157 LOG_RULE_WARNING("'device' link may not be available in future kernels; please fix");
1158 if (strstr(attr, "../") != NULL)
1159 LOG_RULE_WARNING("direct reference to parent sysfs directory, may break in future kernels; please fix");
1160 rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1161
1162 } else if (streq(key, "TAGS")) {
1163 if (op > OP_MATCH_MAX)
1164 LOG_AND_RETURN("invalid %s operation", key);
1165
1166 rule_add_key(&rule_tmp, TK_M_TAGS, op, value, NULL);
1167
1168 } else if (startswith(key, "ENV{")) {
1169 attr = get_key_attribute(key + STRLEN("ENV"));
1170 if (attr == NULL)
1171 LOG_AND_RETURN("error parsing %s attribute", "ENV");
1172
1173 if (op == OP_REMOVE)
1174 LOG_AND_RETURN("invalid %s operation", "ENV");
1175
1176 if (op < OP_MATCH_MAX)
1177 rule_add_key(&rule_tmp, TK_M_ENV, op, value, attr);
1178 else {
1179 if (STR_IN_SET(attr,
1180 "ACTION",
1181 "SUBSYSTEM",
1182 "DEVTYPE",
1183 "MAJOR",
1184 "MINOR",
1185 "DRIVER",
1186 "IFINDEX",
1187 "DEVNAME",
1188 "DEVLINKS",
1189 "DEVPATH",
1190 "TAGS"))
1191 LOG_AND_RETURN("invalid ENV attribute, '%s' cannot be set", attr);
1192
1193 rule_add_key(&rule_tmp, TK_A_ENV, op, value, attr);
1194 }
1195
1196 } else if (streq(key, "TAG")) {
1197 if (op < OP_MATCH_MAX)
1198 rule_add_key(&rule_tmp, TK_M_TAG, op, value, NULL);
1199 else
1200 rule_add_key(&rule_tmp, TK_A_TAG, op, value, NULL);
1201
1202 } else if (streq(key, "PROGRAM")) {
1203 if (op == OP_REMOVE)
1204 LOG_AND_RETURN("invalid %s operation", key);
1205
1206 rule_add_key(&rule_tmp, TK_M_PROGRAM, op, value, NULL);
1207
1208 } else if (streq(key, "RESULT")) {
1209 if (op > OP_MATCH_MAX)
1210 LOG_AND_RETURN("invalid %s operation", key);
1211
1212 rule_add_key(&rule_tmp, TK_M_RESULT, op, value, NULL);
1213
1214 } else if (startswith(key, "IMPORT")) {
1215 attr = get_key_attribute(key + STRLEN("IMPORT"));
1216 if (attr == NULL) {
1217 LOG_RULE_WARNING("ignoring IMPORT{} with missing type");
1218 continue;
1219 }
1220 if (op == OP_REMOVE)
1221 LOG_AND_RETURN("invalid %s operation", "IMPORT");
1222
1223 if (streq(attr, "program")) {
1224 /* find known built-in command */
1225 if (value[0] != '/') {
1226 const enum udev_builtin_cmd cmd = udev_builtin_lookup(value);
1227
1228 if (cmd >= 0) {
1229 LOG_RULE_DEBUG("IMPORT found builtin '%s', replacing", value);
1230 rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, value, &cmd);
1231 continue;
1232 }
1233 }
1234 rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1235 } else if (streq(attr, "builtin")) {
1236 const enum udev_builtin_cmd cmd = udev_builtin_lookup(value);
1237
1238 if (cmd < 0)
1239 LOG_RULE_WARNING("IMPORT{builtin} '%s' unknown", value);
1240 else
1241 rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, value, &cmd);
1242 } else if (streq(attr, "file"))
1243 rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1244 else if (streq(attr, "db"))
1245 rule_add_key(&rule_tmp, TK_M_IMPORT_DB, op, value, NULL);
1246 else if (streq(attr, "cmdline"))
1247 rule_add_key(&rule_tmp, TK_M_IMPORT_CMDLINE, op, value, NULL);
1248 else if (streq(attr, "parent"))
1249 rule_add_key(&rule_tmp, TK_M_IMPORT_PARENT, op, value, NULL);
1250 else
1251 LOG_RULE_ERROR("ignoring unknown %s{} type '%s'", "IMPORT", attr);
1252
1253 } else if (startswith(key, "TEST")) {
1254 mode_t mode = 0;
1255
1256 if (op > OP_MATCH_MAX)
1257 LOG_AND_RETURN("invalid %s operation", "TEST");
1258
1259 attr = get_key_attribute(key + STRLEN("TEST"));
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 } else if (startswith(key, "RUN")) {
1267 attr = get_key_attribute(key + STRLEN("RUN"));
1268 if (attr == NULL)
1269 attr = "program";
1270 if (op == OP_REMOVE)
1271 LOG_AND_RETURN("invalid %s operation", "RUN");
1272
1273 if (streq(attr, "builtin")) {
1274 const enum udev_builtin_cmd cmd = udev_builtin_lookup(value);
1275
1276 if (cmd < 0)
1277 LOG_RULE_ERROR("RUN{builtin}: '%s' unknown", value);
1278 else
1279 rule_add_key(&rule_tmp, TK_A_RUN_BUILTIN, op, value, &cmd);
1280 } else if (streq(attr, "program")) {
1281 const enum udev_builtin_cmd cmd = _UDEV_BUILTIN_MAX;
1282
1283 rule_add_key(&rule_tmp, TK_A_RUN_PROGRAM, op, value, &cmd);
1284 } else
1285 LOG_RULE_ERROR("ignoring unknown %s{} type '%s'", "RUN", attr);
1286
1287 } else if (streq(key, "LABEL")) {
1288 if (op == OP_REMOVE)
1289 LOG_AND_RETURN("invalid %s operation", key);
1290
1291 rule_tmp.rule.rule.label_off = rules_add_string(rules, value);
1292
1293 } else if (streq(key, "GOTO")) {
1294 if (op == OP_REMOVE)
1295 LOG_AND_RETURN("invalid %s operation", key);
1296
1297 rule_add_key(&rule_tmp, TK_A_GOTO, 0, value, NULL);
1298
1299 } else if (startswith(key, "NAME")) {
1300 if (op == OP_REMOVE)
1301 LOG_AND_RETURN("invalid %s operation", key);
1302
1303 if (op < OP_MATCH_MAX)
1304 rule_add_key(&rule_tmp, TK_M_NAME, op, value, NULL);
1305 else {
1306 if (streq(value, "%k")) {
1307 LOG_RULE_WARNING("NAME=\"%%k\" is ignored, because it breaks kernel supplied names; please remove");
1308 continue;
1309 }
1310 if (isempty(value)) {
1311 LOG_RULE_DEBUG("NAME=\"\" is ignored, because udev will not delete any device nodes; please remove");
1312 continue;
1313 }
1314 rule_add_key(&rule_tmp, TK_A_NAME, op, value, NULL);
1315 }
1316 rule_tmp.rule.rule.can_set_name = true;
1317
1318 } else if (streq(key, "SYMLINK")) {
1319 if (op == OP_REMOVE)
1320 LOG_AND_RETURN("invalid %s operation", key);
1321
1322 if (op < OP_MATCH_MAX)
1323 rule_add_key(&rule_tmp, TK_M_DEVLINK, op, value, NULL);
1324 else
1325 rule_add_key(&rule_tmp, TK_A_DEVLINK, op, value, NULL);
1326 rule_tmp.rule.rule.can_set_name = true;
1327
1328 } else if (streq(key, "OWNER")) {
1329 uid_t uid;
1330 char *endptr;
1331
1332 if (op == OP_REMOVE)
1333 LOG_AND_RETURN("invalid %s operation", key);
1334
1335 uid = strtoul(value, &endptr, 10);
1336 if (endptr[0] == '\0')
1337 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1338 else if (rules->resolve_name_timing == RESOLVE_NAME_EARLY && strchr("$%", value[0]) == NULL) {
1339 uid = add_uid(rules, value);
1340 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1341 } else if (rules->resolve_name_timing != RESOLVE_NAME_NEVER)
1342 rule_add_key(&rule_tmp, TK_A_OWNER, op, value, NULL);
1343
1344 rule_tmp.rule.rule.can_set_name = true;
1345
1346 } else if (streq(key, "GROUP")) {
1347 gid_t gid;
1348 char *endptr;
1349
1350 if (op == OP_REMOVE)
1351 LOG_AND_RETURN("invalid %s operation", key);
1352
1353 gid = strtoul(value, &endptr, 10);
1354 if (endptr[0] == '\0')
1355 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1356 else if ((rules->resolve_name_timing == RESOLVE_NAME_EARLY) && strchr("$%", value[0]) == NULL) {
1357 gid = add_gid(rules, value);
1358 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1359 } else if (rules->resolve_name_timing != RESOLVE_NAME_NEVER)
1360 rule_add_key(&rule_tmp, TK_A_GROUP, op, value, NULL);
1361
1362 rule_tmp.rule.rule.can_set_name = true;
1363
1364 } else if (streq(key, "MODE")) {
1365 mode_t mode;
1366 char *endptr;
1367
1368 if (op == OP_REMOVE)
1369 LOG_AND_RETURN("invalid %s operation", key);
1370
1371 mode = strtol(value, &endptr, 8);
1372 if (endptr[0] == '\0')
1373 rule_add_key(&rule_tmp, TK_A_MODE_ID, op, NULL, &mode);
1374 else
1375 rule_add_key(&rule_tmp, TK_A_MODE, op, value, NULL);
1376 rule_tmp.rule.rule.can_set_name = true;
1377
1378 } else if (streq(key, "OPTIONS")) {
1379 const char *pos;
1380
1381 if (op == OP_REMOVE)
1382 LOG_AND_RETURN("invalid %s operation", key);
1383
1384 pos = strstr(value, "link_priority=");
1385 if (pos != NULL) {
1386 int prio = atoi(pos + STRLEN("link_priority="));
1387
1388 rule_add_key(&rule_tmp, TK_A_DEVLINK_PRIO, op, NULL, &prio);
1389 }
1390
1391 pos = strstr(value, "string_escape=");
1392 if (pos != NULL) {
1393 pos += STRLEN("string_escape=");
1394 if (startswith(pos, "none"))
1395 rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_NONE, op, NULL, NULL);
1396 else if (startswith(pos, "replace"))
1397 rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_REPLACE, op, NULL, NULL);
1398 }
1399
1400 pos = strstr(value, "db_persist");
1401 if (pos != NULL)
1402 rule_add_key(&rule_tmp, TK_A_DB_PERSIST, op, NULL, NULL);
1403
1404 pos = strstr(value, "nowatch");
1405 if (pos) {
1406 static const int zero = 0;
1407 rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &zero);
1408 } else {
1409 static const int one = 1;
1410 pos = strstr(value, "watch");
1411 if (pos)
1412 rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &one);
1413 }
1414
1415 pos = strstr(value, "static_node=");
1416 if (pos != NULL) {
1417 pos += STRLEN("static_node=");
1418 rule_add_key(&rule_tmp, TK_A_STATIC_NODE, op, pos, NULL);
1419 rule_tmp.rule.rule.has_static_node = true;
1420 }
1421
1422 } else
1423 LOG_AND_RETURN("unknown key '%s'", key);
1424 }
1425
1426 /* add rule token and sort tokens */
1427 rule_tmp.rule.rule.token_count = 1 + rule_tmp.token_cur;
1428 if (add_token(rules, &rule_tmp.rule) != 0 || sort_token(rules, &rule_tmp) != 0)
1429 LOG_RULE_ERROR("failed to add rule token");
1430 }
1431
1432 static int parse_file(struct udev_rules *rules, const char *filename) {
1433 _cleanup_fclose_ FILE *f = NULL;
1434 unsigned first_token;
1435 unsigned filename_off;
1436 char line[UTIL_LINE_SIZE];
1437 int line_nr = 0;
1438 unsigned i;
1439
1440 f = fopen(filename, "re");
1441 if (!f) {
1442 if (errno == ENOENT)
1443 return 0;
1444
1445 return -errno;
1446 }
1447
1448 if (null_or_empty_fd(fileno(f))) {
1449 log_debug("Skipping empty file: %s", filename);
1450 return 0;
1451 } else
1452 log_debug("Reading rules file: %s", filename);
1453
1454 first_token = rules->token_cur;
1455 filename_off = rules_add_string(rules, filename);
1456
1457 while (fgets(line, sizeof(line), f) != NULL) {
1458 char *key;
1459 size_t len;
1460
1461 /* skip whitespace */
1462 line_nr++;
1463 key = line;
1464 while (isspace(key[0]))
1465 key++;
1466
1467 /* comment */
1468 if (key[0] == '#')
1469 continue;
1470
1471 len = strlen(line);
1472 if (len < 3)
1473 continue;
1474
1475 /* continue reading if backslash+newline is found */
1476 while (line[len-2] == '\\') {
1477 if (fgets(&line[len-2], (sizeof(line)-len)+2, f) == NULL)
1478 break;
1479 if (strlen(&line[len-2]) < 2)
1480 break;
1481 line_nr++;
1482 len = strlen(line);
1483 }
1484
1485 if (len+1 >= sizeof(line)) {
1486 log_error("line too long '%s':%u, ignored", filename, line_nr);
1487 continue;
1488 }
1489 add_rule(rules, key, filename, filename_off, line_nr);
1490 }
1491
1492 /* link GOTOs to LABEL rules in this file to be able to fast-forward */
1493 for (i = first_token+1; i < rules->token_cur; i++) {
1494 if (rules->tokens[i].type == TK_A_GOTO) {
1495 char *label = rules_str(rules, rules->tokens[i].key.value_off);
1496 unsigned j;
1497
1498 for (j = i+1; j < rules->token_cur; j++) {
1499 if (rules->tokens[j].type != TK_RULE)
1500 continue;
1501 if (rules->tokens[j].rule.label_off == 0)
1502 continue;
1503 if (!streq(label, rules_str(rules, rules->tokens[j].rule.label_off)))
1504 continue;
1505 rules->tokens[i].key.rule_goto = j;
1506 break;
1507 }
1508 if (rules->tokens[i].key.rule_goto == 0)
1509 log_error("GOTO '%s' has no matching label in: '%s'", label, filename);
1510 }
1511 }
1512 return 0;
1513 }
1514
1515 struct udev_rules *udev_rules_new(ResolveNameTiming resolve_name_timing) {
1516 struct udev_rules *rules;
1517 struct token end_token;
1518 char **files, **f;
1519 int r;
1520
1521 assert(resolve_name_timing >= 0 && resolve_name_timing < _RESOLVE_NAME_TIMING_MAX);
1522
1523 rules = new(struct udev_rules, 1);
1524 if (!rules)
1525 return NULL;
1526
1527 *rules = (struct udev_rules) {
1528 .resolve_name_timing = resolve_name_timing,
1529 };
1530
1531 /* init token array and string buffer */
1532 rules->tokens = malloc_multiply(PREALLOC_TOKEN, sizeof(struct token));
1533 if (rules->tokens == NULL)
1534 return udev_rules_unref(rules);
1535 rules->token_max = PREALLOC_TOKEN;
1536
1537 rules->strbuf = strbuf_new();
1538 if (!rules->strbuf)
1539 return udev_rules_unref(rules);
1540
1541 udev_rules_check_timestamp(rules);
1542
1543 r = conf_files_list_strv(&files, ".rules", NULL, 0, rules_dirs);
1544 if (r < 0) {
1545 log_error_errno(r, "failed to enumerate rules files: %m");
1546 return udev_rules_unref(rules);
1547 }
1548
1549 /*
1550 * The offset value in the rules strct is limited; add all
1551 * rules file names to the beginning of the string buffer.
1552 */
1553 STRV_FOREACH(f, files)
1554 rules_add_string(rules, *f);
1555
1556 STRV_FOREACH(f, files)
1557 parse_file(rules, *f);
1558
1559 strv_free(files);
1560
1561 memzero(&end_token, sizeof(struct token));
1562 end_token.type = TK_END;
1563 add_token(rules, &end_token);
1564 log_debug("rules contain %zu bytes tokens (%u * %zu bytes), %zu bytes strings",
1565 rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->strbuf->len);
1566
1567 /* cleanup temporary strbuf data */
1568 log_debug("%zu strings (%zu bytes), %zu de-duplicated (%zu bytes), %zu trie nodes used",
1569 rules->strbuf->in_count, rules->strbuf->in_len,
1570 rules->strbuf->dedup_count, rules->strbuf->dedup_len, rules->strbuf->nodes_count);
1571 strbuf_complete(rules->strbuf);
1572
1573 /* cleanup uid/gid cache */
1574 rules->uids = mfree(rules->uids);
1575 rules->uids_cur = 0;
1576 rules->uids_max = 0;
1577 rules->gids = mfree(rules->gids);
1578 rules->gids_cur = 0;
1579 rules->gids_max = 0;
1580
1581 dump_rules(rules);
1582 return rules;
1583 }
1584
1585 struct udev_rules *udev_rules_unref(struct udev_rules *rules) {
1586 if (rules == NULL)
1587 return NULL;
1588 free(rules->tokens);
1589 strbuf_cleanup(rules->strbuf);
1590 free(rules->uids);
1591 free(rules->gids);
1592 return mfree(rules);
1593 }
1594
1595 bool udev_rules_check_timestamp(struct udev_rules *rules) {
1596 if (!rules)
1597 return false;
1598
1599 return paths_check_timestamp(rules_dirs, &rules->dirs_ts_usec, true);
1600 }
1601
1602 static int match_key(struct udev_rules *rules, struct token *token, const char *val) {
1603 char *key_value = rules_str(rules, token->key.value_off);
1604 char *pos;
1605 bool match = false;
1606
1607 if (val == NULL)
1608 val = "";
1609
1610 switch (token->key.glob) {
1611 case GL_PLAIN:
1612 match = (streq(key_value, val));
1613 break;
1614 case GL_GLOB:
1615 match = (fnmatch(key_value, val, 0) == 0);
1616 break;
1617 case GL_SPLIT:
1618 {
1619 const char *s;
1620 size_t len;
1621
1622 s = rules_str(rules, token->key.value_off);
1623 len = strlen(val);
1624 for (;;) {
1625 const char *next;
1626
1627 next = strchr(s, '|');
1628 if (next != NULL) {
1629 size_t matchlen = (size_t)(next - s);
1630
1631 match = (matchlen == len && strneq(s, val, matchlen));
1632 if (match)
1633 break;
1634 } else {
1635 match = (streq(s, val));
1636 break;
1637 }
1638 s = &next[1];
1639 }
1640 break;
1641 }
1642 case GL_SPLIT_GLOB:
1643 {
1644 char value[UTIL_PATH_SIZE];
1645
1646 strscpy(value, sizeof(value), rules_str(rules, token->key.value_off));
1647 key_value = value;
1648 while (key_value != NULL) {
1649 pos = strchr(key_value, '|');
1650 if (pos != NULL) {
1651 pos[0] = '\0';
1652 pos = &pos[1];
1653 }
1654 match = (fnmatch(key_value, val, 0) == 0);
1655 if (match)
1656 break;
1657 key_value = pos;
1658 }
1659 break;
1660 }
1661 case GL_SOMETHING:
1662 match = (val[0] != '\0');
1663 break;
1664 case GL_UNSET:
1665 return -1;
1666 }
1667
1668 if (match && (token->key.op == OP_MATCH))
1669 return 0;
1670 if (!match && (token->key.op == OP_NOMATCH))
1671 return 0;
1672 return -1;
1673 }
1674
1675 static int match_attr(struct udev_rules *rules, sd_device *dev, struct udev_event *event, struct token *cur) {
1676 char nbuf[UTIL_NAME_SIZE], vbuf[UTIL_NAME_SIZE];
1677 const char *name, *value;
1678 size_t len;
1679
1680 name = rules_str(rules, cur->key.attr_off);
1681 switch (cur->key.attrsubst) {
1682 case SB_FORMAT:
1683 udev_event_apply_format(event, name, nbuf, sizeof(nbuf), false);
1684 name = nbuf;
1685 _fallthrough_;
1686 case SB_NONE:
1687 if (sd_device_get_sysattr_value(dev, name, &value) < 0)
1688 return -1;
1689 break;
1690 case SB_SUBSYS:
1691 if (util_resolve_subsys_kernel(name, vbuf, sizeof(vbuf), true) != 0)
1692 return -1;
1693 value = vbuf;
1694 break;
1695 default:
1696 return -1;
1697 }
1698
1699 /* remove trailing whitespace, if not asked to match for it */
1700 len = strlen(value);
1701 if (len > 0 && isspace(value[len-1])) {
1702 const char *key_value;
1703 size_t klen;
1704
1705 key_value = rules_str(rules, cur->key.value_off);
1706 klen = strlen(key_value);
1707 if (klen > 0 && !isspace(key_value[klen-1])) {
1708 if (value != vbuf) {
1709 strscpy(vbuf, sizeof(vbuf), value);
1710 value = vbuf;
1711 }
1712 while (len > 0 && isspace(vbuf[--len]))
1713 vbuf[len] = '\0';
1714 }
1715 }
1716
1717 return match_key(rules, cur, value);
1718 }
1719
1720 enum escape_type {
1721 ESCAPE_UNSET,
1722 ESCAPE_NONE,
1723 ESCAPE_REPLACE,
1724 };
1725
1726 int udev_rules_apply_to_event(
1727 struct udev_rules *rules,
1728 struct udev_event *event,
1729 usec_t timeout_usec,
1730 Hashmap *properties_list) {
1731 sd_device *dev = event->dev;
1732 enum escape_type esc = ESCAPE_UNSET;
1733 struct token *cur, *rule;
1734 const char *action, *val;
1735 bool can_set_name;
1736 int r;
1737
1738 if (!rules->tokens)
1739 return 0;
1740
1741 r = sd_device_get_property_value(dev, "ACTION", &action);
1742 if (r < 0)
1743 return r;
1744
1745 can_set_name = (!streq(action, "remove") &&
1746 (sd_device_get_devnum(dev, NULL) >= 0 ||
1747 sd_device_get_ifindex(dev, NULL) >= 0));
1748
1749 /* loop through token list, match, run actions or forward to next rule */
1750 cur = &rules->tokens[0];
1751 rule = cur;
1752 for (;;) {
1753 dump_token(rules, cur);
1754 switch (cur->type) {
1755 case TK_RULE:
1756 /* current rule */
1757 rule = cur;
1758 /* possibly skip rules which want to set NAME, SYMLINK, OWNER, GROUP, MODE */
1759 if (!can_set_name && rule->rule.can_set_name)
1760 goto nomatch;
1761 esc = ESCAPE_UNSET;
1762 break;
1763 case TK_M_ACTION:
1764 if (match_key(rules, cur, action) != 0)
1765 goto nomatch;
1766 break;
1767 case TK_M_DEVPATH:
1768 if (sd_device_get_devpath(dev, &val) < 0)
1769 goto nomatch;
1770 if (match_key(rules, cur, val) != 0)
1771 goto nomatch;
1772 break;
1773 case TK_M_KERNEL:
1774 if (sd_device_get_sysname(dev, &val) < 0)
1775 goto nomatch;
1776 if (match_key(rules, cur, val) != 0)
1777 goto nomatch;
1778 break;
1779 case TK_M_DEVLINK: {
1780 const char *devlink;
1781 bool match = false;
1782
1783 FOREACH_DEVICE_DEVLINK(dev, devlink)
1784 if (match_key(rules, cur, devlink + STRLEN("/dev/")) == 0) {
1785 match = true;
1786 break;
1787 }
1788
1789 if (!match)
1790 goto nomatch;
1791 break;
1792 }
1793 case TK_M_NAME:
1794 if (match_key(rules, cur, event->name) != 0)
1795 goto nomatch;
1796 break;
1797 case TK_M_ENV: {
1798 const char *key_name = rules_str(rules, cur->key.attr_off);
1799
1800 if (sd_device_get_property_value(dev, key_name, &val) < 0) {
1801 /* check global properties */
1802 if (properties_list)
1803 val = hashmap_get(properties_list, key_name);
1804 else
1805 val = NULL;
1806 }
1807
1808 if (match_key(rules, cur, strempty(val)))
1809 goto nomatch;
1810 break;
1811 }
1812 case TK_M_TAG: {
1813 bool match = false;
1814 const char *tag;
1815
1816 FOREACH_DEVICE_TAG(dev, tag)
1817 if (streq(rules_str(rules, cur->key.value_off), tag)) {
1818 match = true;
1819 break;
1820 }
1821
1822 if ((!match && (cur->key.op != OP_NOMATCH)) ||
1823 (match && (cur->key.op == OP_NOMATCH)))
1824 goto nomatch;
1825 break;
1826 }
1827 case TK_M_SUBSYSTEM:
1828 if (sd_device_get_subsystem(dev, &val) < 0)
1829 goto nomatch;
1830 if (match_key(rules, cur, val) != 0)
1831 goto nomatch;
1832 break;
1833 case TK_M_DRIVER:
1834 if (sd_device_get_driver(dev, &val) < 0)
1835 goto nomatch;
1836 if (match_key(rules, cur, val) != 0)
1837 goto nomatch;
1838 break;
1839 case TK_M_ATTR:
1840 if (match_attr(rules, dev, event, cur) != 0)
1841 goto nomatch;
1842 break;
1843 case TK_M_SYSCTL: {
1844 char filename[UTIL_PATH_SIZE];
1845 _cleanup_free_ char *value = NULL;
1846 size_t len;
1847
1848 udev_event_apply_format(event, rules_str(rules, cur->key.attr_off), filename, sizeof(filename), false);
1849 sysctl_normalize(filename);
1850 if (sysctl_read(filename, &value) < 0)
1851 goto nomatch;
1852
1853 len = strlen(value);
1854 while (len > 0 && isspace(value[--len]))
1855 value[len] = '\0';
1856 if (match_key(rules, cur, value) != 0)
1857 goto nomatch;
1858 break;
1859 }
1860 case TK_M_KERNELS:
1861 case TK_M_SUBSYSTEMS:
1862 case TK_M_DRIVERS:
1863 case TK_M_ATTRS:
1864 case TK_M_TAGS: {
1865 struct token *next;
1866
1867 /* get whole sequence of parent matches */
1868 next = cur;
1869 while (next->type > TK_M_PARENTS_MIN && next->type < TK_M_PARENTS_MAX)
1870 next++;
1871
1872 /* loop over parents */
1873 event->dev_parent = dev;
1874 for (;;) {
1875 struct token *key;
1876
1877 /* loop over sequence of parent match keys */
1878 for (key = cur; key < next; key++ ) {
1879 dump_token(rules, key);
1880 switch(key->type) {
1881 case TK_M_KERNELS:
1882 if (sd_device_get_sysname(event->dev_parent, &val) < 0)
1883 goto try_parent;
1884 if (match_key(rules, key, val) != 0)
1885 goto try_parent;
1886 break;
1887 case TK_M_SUBSYSTEMS:
1888 if (sd_device_get_subsystem(event->dev_parent, &val) < 0)
1889 goto try_parent;
1890 if (match_key(rules, key, val) != 0)
1891 goto try_parent;
1892 break;
1893 case TK_M_DRIVERS:
1894 if (sd_device_get_driver(event->dev_parent, &val) < 0)
1895 goto try_parent;
1896 if (match_key(rules, key, val) != 0)
1897 goto try_parent;
1898 break;
1899 case TK_M_ATTRS:
1900 if (match_attr(rules, event->dev_parent, event, key) != 0)
1901 goto try_parent;
1902 break;
1903 case TK_M_TAGS: {
1904 bool match = sd_device_has_tag(event->dev_parent, rules_str(rules, cur->key.value_off));
1905
1906 if (match && key->key.op == OP_NOMATCH)
1907 goto try_parent;
1908 if (!match && key->key.op == OP_MATCH)
1909 goto try_parent;
1910 break;
1911 }
1912 default:
1913 goto nomatch;
1914 }
1915 }
1916 break;
1917
1918 try_parent:
1919 if (sd_device_get_parent(event->dev_parent, &event->dev_parent) < 0) {
1920 event->dev_parent = NULL;
1921 goto nomatch;
1922 }
1923 }
1924 /* move behind our sequence of parent match keys */
1925 cur = next;
1926 continue;
1927 }
1928 case TK_M_TEST: {
1929 char filename[UTIL_PATH_SIZE];
1930 struct stat statbuf;
1931 int match;
1932
1933 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), filename, sizeof(filename), false);
1934 if (util_resolve_subsys_kernel(filename, filename, sizeof(filename), false) != 0) {
1935 if (filename[0] != '/') {
1936 char tmp[UTIL_PATH_SIZE];
1937
1938 if (sd_device_get_syspath(dev, &val) < 0)
1939 goto nomatch;
1940
1941 strscpy(tmp, sizeof(tmp), filename);
1942 strscpyl(filename, sizeof(filename), val, "/", tmp, NULL);
1943 }
1944 }
1945 attr_subst_subdir(filename, sizeof(filename));
1946
1947 match = (stat(filename, &statbuf) == 0);
1948 if (match && cur->key.mode > 0)
1949 match = ((statbuf.st_mode & cur->key.mode) > 0);
1950 if (match && cur->key.op == OP_NOMATCH)
1951 goto nomatch;
1952 if (!match && cur->key.op == OP_MATCH)
1953 goto nomatch;
1954 break;
1955 }
1956 case TK_M_PROGRAM: {
1957 char program[UTIL_PATH_SIZE], result[UTIL_LINE_SIZE];
1958
1959 event->program_result = mfree(event->program_result);
1960 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), program, sizeof(program), false);
1961 log_debug("PROGRAM '%s' %s:%u",
1962 program,
1963 rules_str(rules, rule->rule.filename_off),
1964 rule->rule.filename_line);
1965
1966 if (udev_event_spawn(event, timeout_usec, true, program, result, sizeof(result)) < 0) {
1967 if (cur->key.op != OP_NOMATCH)
1968 goto nomatch;
1969 } else {
1970 int count;
1971
1972 delete_trailing_chars(result, "\n");
1973 if (IN_SET(esc, ESCAPE_UNSET, ESCAPE_REPLACE)) {
1974 count = util_replace_chars(result, UDEV_ALLOWED_CHARS_INPUT);
1975 if (count > 0)
1976 log_debug("%i character(s) replaced" , count);
1977 }
1978 event->program_result = strdup(result);
1979 if (cur->key.op == OP_NOMATCH)
1980 goto nomatch;
1981 }
1982 break;
1983 }
1984 case TK_M_IMPORT_FILE: {
1985 char import[UTIL_PATH_SIZE];
1986
1987 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), import, sizeof(import), false);
1988 if (import_file_into_properties(dev, import) != 0)
1989 if (cur->key.op != OP_NOMATCH)
1990 goto nomatch;
1991 break;
1992 }
1993 case TK_M_IMPORT_PROG: {
1994 char import[UTIL_PATH_SIZE];
1995
1996 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), import, sizeof(import), false);
1997 log_debug("IMPORT '%s' %s:%u",
1998 import,
1999 rules_str(rules, rule->rule.filename_off),
2000 rule->rule.filename_line);
2001
2002 if (import_program_into_properties(event, timeout_usec, import) != 0)
2003 if (cur->key.op != OP_NOMATCH)
2004 goto nomatch;
2005 break;
2006 }
2007 case TK_M_IMPORT_BUILTIN: {
2008 char command[UTIL_PATH_SIZE];
2009
2010 if (udev_builtin_run_once(cur->key.builtin_cmd)) {
2011 /* check if we ran already */
2012 if (event->builtin_run & (1 << cur->key.builtin_cmd)) {
2013 log_debug("IMPORT builtin skip '%s' %s:%u",
2014 udev_builtin_name(cur->key.builtin_cmd),
2015 rules_str(rules, rule->rule.filename_off),
2016 rule->rule.filename_line);
2017 /* return the result from earlier run */
2018 if (event->builtin_ret & (1 << cur->key.builtin_cmd))
2019 if (cur->key.op != OP_NOMATCH)
2020 goto nomatch;
2021 break;
2022 }
2023 /* mark as ran */
2024 event->builtin_run |= (1 << cur->key.builtin_cmd);
2025 }
2026
2027 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), command, sizeof(command), false);
2028 log_debug("IMPORT builtin '%s' %s:%u",
2029 udev_builtin_name(cur->key.builtin_cmd),
2030 rules_str(rules, rule->rule.filename_off),
2031 rule->rule.filename_line);
2032
2033 r = udev_builtin_run(dev, cur->key.builtin_cmd, command, false);
2034 if (r < 0) {
2035 /* remember failure */
2036 log_debug_errno(r, "IMPORT builtin '%s' fails: %m",
2037 udev_builtin_name(cur->key.builtin_cmd));
2038 event->builtin_ret |= (1 << cur->key.builtin_cmd);
2039 if (cur->key.op != OP_NOMATCH)
2040 goto nomatch;
2041 }
2042 break;
2043 }
2044 case TK_M_IMPORT_DB: {
2045 const char *key;
2046
2047 key = rules_str(rules, cur->key.value_off);
2048 if (event->dev_db_clone &&
2049 sd_device_get_property_value(event->dev_db_clone, key, &val) >= 0)
2050 device_add_property(dev, key, val);
2051 else if (cur->key.op != OP_NOMATCH)
2052 goto nomatch;
2053 break;
2054 }
2055 case TK_M_IMPORT_CMDLINE: {
2056 _cleanup_free_ char *value = NULL;
2057 bool imported = false;
2058 const char *key;
2059
2060 key = rules_str(rules, cur->key.value_off);
2061 r = proc_cmdline_get_key(key, PROC_CMDLINE_VALUE_OPTIONAL, &value);
2062 if (r < 0)
2063 log_debug_errno(r, "Failed to read %s from /proc/cmdline, ignoring: %m", key);
2064 else if (r > 0) {
2065 imported = true;
2066
2067 if (value)
2068 device_add_property(dev, key, value);
2069 else
2070 /* we import simple flags as 'FLAG=1' */
2071 device_add_property(dev, key, "1");
2072 }
2073
2074 if (!imported && cur->key.op != OP_NOMATCH)
2075 goto nomatch;
2076 break;
2077 }
2078 case TK_M_IMPORT_PARENT: {
2079 char import[UTIL_PATH_SIZE];
2080
2081 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), import, sizeof(import), false);
2082 if (import_parent_into_properties(dev, import) != 0)
2083 if (cur->key.op != OP_NOMATCH)
2084 goto nomatch;
2085 break;
2086 }
2087 case TK_M_RESULT:
2088 if (match_key(rules, cur, event->program_result) != 0)
2089 goto nomatch;
2090 break;
2091 case TK_A_STRING_ESCAPE_NONE:
2092 esc = ESCAPE_NONE;
2093 break;
2094 case TK_A_STRING_ESCAPE_REPLACE:
2095 esc = ESCAPE_REPLACE;
2096 break;
2097 case TK_A_DB_PERSIST:
2098 device_set_db_persist(dev);
2099 break;
2100 case TK_A_INOTIFY_WATCH:
2101 if (event->inotify_watch_final)
2102 break;
2103 if (cur->key.op == OP_ASSIGN_FINAL)
2104 event->inotify_watch_final = true;
2105 event->inotify_watch = cur->key.watch;
2106 break;
2107 case TK_A_DEVLINK_PRIO:
2108 device_set_devlink_priority(dev, cur->key.devlink_prio);
2109 break;
2110 case TK_A_OWNER: {
2111 char owner[UTIL_NAME_SIZE];
2112 const char *ow = owner;
2113
2114 if (event->owner_final)
2115 break;
2116 if (cur->key.op == OP_ASSIGN_FINAL)
2117 event->owner_final = true;
2118 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), owner, sizeof(owner), false);
2119 event->owner_set = true;
2120 r = get_user_creds(&ow, &event->uid, NULL, NULL, NULL, USER_CREDS_ALLOW_MISSING);
2121 if (r < 0) {
2122 log_unknown_owner(r, "user", owner);
2123 event->uid = 0;
2124 }
2125 log_debug("OWNER %u %s:%u",
2126 event->uid,
2127 rules_str(rules, rule->rule.filename_off),
2128 rule->rule.filename_line);
2129 break;
2130 }
2131 case TK_A_GROUP: {
2132 char group[UTIL_NAME_SIZE];
2133 const char *gr = group;
2134
2135 if (event->group_final)
2136 break;
2137 if (cur->key.op == OP_ASSIGN_FINAL)
2138 event->group_final = true;
2139 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), group, sizeof(group), false);
2140 event->group_set = true;
2141 r = get_group_creds(&gr, &event->gid, USER_CREDS_ALLOW_MISSING);
2142 if (r < 0) {
2143 log_unknown_owner(r, "group", group);
2144 event->gid = 0;
2145 }
2146 log_debug("GROUP %u %s:%u",
2147 event->gid,
2148 rules_str(rules, rule->rule.filename_off),
2149 rule->rule.filename_line);
2150 break;
2151 }
2152 case TK_A_MODE: {
2153 char mode_str[UTIL_NAME_SIZE], *endptr;
2154 mode_t mode;
2155
2156 if (event->mode_final)
2157 break;
2158 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), mode_str, sizeof(mode_str), false);
2159 mode = strtol(mode_str, &endptr, 8);
2160 if (endptr[0] != '\0') {
2161 log_error("ignoring invalid mode '%s'", mode_str);
2162 break;
2163 }
2164 if (cur->key.op == OP_ASSIGN_FINAL)
2165 event->mode_final = true;
2166 event->mode_set = true;
2167 event->mode = mode;
2168 log_debug("MODE %#o %s:%u",
2169 event->mode,
2170 rules_str(rules, rule->rule.filename_off),
2171 rule->rule.filename_line);
2172 break;
2173 }
2174 case TK_A_OWNER_ID:
2175 if (event->owner_final)
2176 break;
2177 if (cur->key.op == OP_ASSIGN_FINAL)
2178 event->owner_final = true;
2179 event->owner_set = true;
2180 event->uid = cur->key.uid;
2181 log_debug("OWNER %u %s:%u",
2182 event->uid,
2183 rules_str(rules, rule->rule.filename_off),
2184 rule->rule.filename_line);
2185 break;
2186 case TK_A_GROUP_ID:
2187 if (event->group_final)
2188 break;
2189 if (cur->key.op == OP_ASSIGN_FINAL)
2190 event->group_final = true;
2191 event->group_set = true;
2192 event->gid = cur->key.gid;
2193 log_debug("GROUP %u %s:%u",
2194 event->gid,
2195 rules_str(rules, rule->rule.filename_off),
2196 rule->rule.filename_line);
2197 break;
2198 case TK_A_MODE_ID:
2199 if (event->mode_final)
2200 break;
2201 if (cur->key.op == OP_ASSIGN_FINAL)
2202 event->mode_final = true;
2203 event->mode_set = true;
2204 event->mode = cur->key.mode;
2205 log_debug("MODE %#o %s:%u",
2206 event->mode,
2207 rules_str(rules, rule->rule.filename_off),
2208 rule->rule.filename_line);
2209 break;
2210 case TK_A_SECLABEL: {
2211 _cleanup_free_ char *name = NULL, *label = NULL;
2212 char label_str[UTIL_LINE_SIZE] = {};
2213
2214 name = strdup(rules_str(rules, cur->key.attr_off));
2215 if (!name)
2216 return log_oom();
2217
2218 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), label_str, sizeof(label_str), false);
2219 if (!isempty(label_str))
2220 label = strdup(label_str);
2221 else
2222 label = strdup(rules_str(rules, cur->key.value_off));
2223 if (!label)
2224 return log_oom();
2225
2226 if (IN_SET(cur->key.op, OP_ASSIGN, OP_ASSIGN_FINAL))
2227 hashmap_clear_free_free(event->seclabel_list);
2228
2229 r = hashmap_ensure_allocated(&event->seclabel_list, NULL);
2230 if (r < 0)
2231 return log_oom();
2232
2233 r = hashmap_put(event->seclabel_list, name, label);
2234 if (r < 0)
2235 return log_oom();
2236
2237 name = label = NULL;
2238
2239 log_debug("SECLABEL{%s}='%s' %s:%u",
2240 name, label,
2241 rules_str(rules, rule->rule.filename_off),
2242 rule->rule.filename_line);
2243 break;
2244 }
2245 case TK_A_ENV: {
2246 char value_new[UTIL_NAME_SIZE];
2247 const char *name, *value_old;
2248
2249 name = rules_str(rules, cur->key.attr_off);
2250 val = rules_str(rules, cur->key.value_off);
2251 if (val[0] == '\0') {
2252 if (cur->key.op == OP_ADD)
2253 break;
2254 device_add_property(dev, name, NULL);
2255 break;
2256 }
2257
2258 if (cur->key.op == OP_ADD &&
2259 sd_device_get_property_value(dev, name, &value_old) >= 0) {
2260 char temp[UTIL_NAME_SIZE];
2261
2262 /* append value separated by space */
2263 udev_event_apply_format(event, val, temp, sizeof(temp), false);
2264 strscpyl(value_new, sizeof(value_new), value_old, " ", temp, NULL);
2265 } else
2266 udev_event_apply_format(event, val, value_new, sizeof(value_new), false);
2267
2268 device_add_property(dev, name, value_new);
2269 break;
2270 }
2271 case TK_A_TAG: {
2272 char tag[UTIL_PATH_SIZE];
2273 const char *p;
2274
2275 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), tag, sizeof(tag), false);
2276 if (IN_SET(cur->key.op, OP_ASSIGN, OP_ASSIGN_FINAL))
2277 device_cleanup_tags(dev);
2278 for (p = tag; *p != '\0'; p++) {
2279 if ((*p >= 'a' && *p <= 'z') ||
2280 (*p >= 'A' && *p <= 'Z') ||
2281 (*p >= '0' && *p <= '9') ||
2282 IN_SET(*p, '-', '_'))
2283 continue;
2284 log_error("ignoring invalid tag name '%s'", tag);
2285 break;
2286 }
2287 if (cur->key.op == OP_REMOVE)
2288 device_remove_tag(dev, tag);
2289 else
2290 device_add_tag(dev, tag);
2291 break;
2292 }
2293 case TK_A_NAME: {
2294 char name_str[UTIL_PATH_SIZE];
2295 const char *name;
2296 int count;
2297
2298 name = rules_str(rules, cur->key.value_off);
2299 if (event->name_final)
2300 break;
2301 if (cur->key.op == OP_ASSIGN_FINAL)
2302 event->name_final = true;
2303 udev_event_apply_format(event, name, name_str, sizeof(name_str), false);
2304 if (IN_SET(esc, ESCAPE_UNSET, ESCAPE_REPLACE)) {
2305 count = util_replace_chars(name_str, "/");
2306 if (count > 0)
2307 log_debug("%i character(s) replaced", count);
2308 }
2309 if (sd_device_get_devnum(dev, NULL) >= 0 &&
2310 (sd_device_get_devname(dev, &val) < 0 ||
2311 !streq(name_str, val + STRLEN("/dev/")))) {
2312 log_error("NAME=\"%s\" ignored, kernel device nodes cannot be renamed; please fix it in %s:%u\n",
2313 name,
2314 rules_str(rules, rule->rule.filename_off),
2315 rule->rule.filename_line);
2316 break;
2317 }
2318 if (free_and_strdup(&event->name, name_str) < 0)
2319 return log_oom();
2320
2321 log_debug("NAME '%s' %s:%u",
2322 event->name,
2323 rules_str(rules, rule->rule.filename_off),
2324 rule->rule.filename_line);
2325 break;
2326 }
2327 case TK_A_DEVLINK: {
2328 char temp[UTIL_PATH_SIZE], filename[UTIL_PATH_SIZE], *pos, *next;
2329 int count = 0;
2330
2331 if (event->devlink_final)
2332 break;
2333 if (sd_device_get_devnum(dev, NULL) < 0)
2334 break;
2335 if (cur->key.op == OP_ASSIGN_FINAL)
2336 event->devlink_final = true;
2337 if (IN_SET(cur->key.op, OP_ASSIGN, OP_ASSIGN_FINAL))
2338 device_cleanup_devlinks(dev);
2339
2340 /* allow multiple symlinks separated by spaces */
2341 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), temp, sizeof(temp), esc != ESCAPE_NONE);
2342 if (esc == ESCAPE_UNSET)
2343 count = util_replace_chars(temp, "/ ");
2344 else if (esc == ESCAPE_REPLACE)
2345 count = util_replace_chars(temp, "/");
2346 if (count > 0)
2347 log_debug("%i character(s) replaced" , count);
2348 pos = temp;
2349 while (isspace(pos[0]))
2350 pos++;
2351 next = strchr(pos, ' ');
2352 while (next) {
2353 next[0] = '\0';
2354 log_debug("LINK '%s' %s:%u", pos,
2355 rules_str(rules, rule->rule.filename_off), rule->rule.filename_line);
2356 strscpyl(filename, sizeof(filename), "/dev/", pos, NULL);
2357 device_add_devlink(dev, filename);
2358 while (isspace(next[1]))
2359 next++;
2360 pos = &next[1];
2361 next = strchr(pos, ' ');
2362 }
2363 if (pos[0] != '\0') {
2364 log_debug("LINK '%s' %s:%u", pos,
2365 rules_str(rules, rule->rule.filename_off), rule->rule.filename_line);
2366 strscpyl(filename, sizeof(filename), "/dev/", pos, NULL);
2367 device_add_devlink(dev, filename);
2368 }
2369 break;
2370 }
2371 case TK_A_ATTR: {
2372 char attr[UTIL_PATH_SIZE], value[UTIL_NAME_SIZE];
2373 _cleanup_fclose_ FILE *f = NULL;
2374 const char *key_name;
2375
2376 key_name = rules_str(rules, cur->key.attr_off);
2377 if (util_resolve_subsys_kernel(key_name, attr, sizeof(attr), false) != 0 &&
2378 sd_device_get_syspath(dev, &val) >= 0)
2379 strscpyl(attr, sizeof(attr), val, "/", key_name, NULL);
2380 attr_subst_subdir(attr, sizeof(attr));
2381
2382 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), value, sizeof(value), false);
2383 log_debug("ATTR '%s' writing '%s' %s:%u", attr, value,
2384 rules_str(rules, rule->rule.filename_off),
2385 rule->rule.filename_line);
2386 f = fopen(attr, "we");
2387 if (f == NULL)
2388 log_error_errno(errno, "error opening ATTR{%s} for writing: %m", attr);
2389 else if (fprintf(f, "%s", value) <= 0)
2390 log_error_errno(errno, "error writing ATTR{%s}: %m", attr);
2391 break;
2392 }
2393 case TK_A_SYSCTL: {
2394 char filename[UTIL_PATH_SIZE], value[UTIL_NAME_SIZE];
2395
2396 udev_event_apply_format(event, rules_str(rules, cur->key.attr_off), filename, sizeof(filename), false);
2397 sysctl_normalize(filename);
2398 udev_event_apply_format(event, rules_str(rules, cur->key.value_off), value, sizeof(value), false);
2399 log_debug("SYSCTL '%s' writing '%s' %s:%u", filename, value,
2400 rules_str(rules, rule->rule.filename_off), rule->rule.filename_line);
2401 r = sysctl_write(filename, value);
2402 if (r < 0)
2403 log_error_errno(r, "error writing SYSCTL{%s}='%s': %m", filename, value);
2404 break;
2405 }
2406 case TK_A_RUN_BUILTIN:
2407 case TK_A_RUN_PROGRAM: {
2408 _cleanup_free_ char *cmd = NULL;
2409
2410 if (IN_SET(cur->key.op, OP_ASSIGN, OP_ASSIGN_FINAL)) {
2411 void *p;
2412
2413 while ((p = hashmap_steal_first_key(event->run_list)))
2414 free(p);
2415 }
2416
2417 r = hashmap_ensure_allocated(&event->run_list, NULL);
2418 if (r < 0)
2419 return log_oom();
2420
2421 cmd = strdup(rules_str(rules, cur->key.value_off));
2422 if (!cmd)
2423 return log_oom();
2424
2425 r = hashmap_put(event->run_list, cmd, INT_TO_PTR(cur->key.builtin_cmd));
2426 if (r < 0)
2427 return log_oom();
2428
2429 cmd = NULL;
2430
2431 log_debug("RUN '%s' %s:%u",
2432 rules_str(rules, cur->key.value_off),
2433 rules_str(rules, rule->rule.filename_off),
2434 rule->rule.filename_line);
2435 break;
2436 }
2437 case TK_A_GOTO:
2438 if (cur->key.rule_goto == 0)
2439 break;
2440 cur = &rules->tokens[cur->key.rule_goto];
2441 continue;
2442 case TK_END:
2443 return 0;
2444
2445 case TK_M_PARENTS_MIN:
2446 case TK_M_PARENTS_MAX:
2447 case TK_M_MAX:
2448 case TK_UNSET:
2449 log_error("wrong type %u", cur->type);
2450 goto nomatch;
2451 }
2452
2453 cur++;
2454 continue;
2455 nomatch:
2456 /* fast-forward to next rule */
2457 cur = rule + rule->rule.token_count;
2458 }
2459
2460 return 0;
2461 }
2462
2463 int udev_rules_apply_static_dev_perms(struct udev_rules *rules) {
2464 struct token *cur;
2465 struct token *rule;
2466 uid_t uid = 0;
2467 gid_t gid = 0;
2468 mode_t mode = 0;
2469 _cleanup_strv_free_ char **tags = NULL;
2470 char **t;
2471 FILE *f = NULL;
2472 _cleanup_free_ char *path = NULL;
2473 int r;
2474
2475 if (rules->tokens == NULL)
2476 return 0;
2477
2478 cur = &rules->tokens[0];
2479 rule = cur;
2480 for (;;) {
2481 switch (cur->type) {
2482 case TK_RULE:
2483 /* current rule */
2484 rule = cur;
2485
2486 /* skip rules without a static_node tag */
2487 if (!rule->rule.has_static_node)
2488 goto next;
2489
2490 uid = 0;
2491 gid = 0;
2492 mode = 0;
2493 tags = strv_free(tags);
2494 break;
2495 case TK_A_OWNER_ID:
2496 uid = cur->key.uid;
2497 break;
2498 case TK_A_GROUP_ID:
2499 gid = cur->key.gid;
2500 break;
2501 case TK_A_MODE_ID:
2502 mode = cur->key.mode;
2503 break;
2504 case TK_A_TAG:
2505 r = strv_extend(&tags, rules_str(rules, cur->key.value_off));
2506 if (r < 0)
2507 goto finish;
2508
2509 break;
2510 case TK_A_STATIC_NODE: {
2511 char device_node[UTIL_PATH_SIZE];
2512 char tags_dir[UTIL_PATH_SIZE];
2513 char tag_symlink[UTIL_PATH_SIZE];
2514 struct stat stats;
2515
2516 /* we assure, that the permissions tokens are sorted before the static token */
2517
2518 if (mode == 0 && uid == 0 && gid == 0 && tags == NULL)
2519 goto next;
2520
2521 strscpyl(device_node, sizeof(device_node), "/dev/", rules_str(rules, cur->key.value_off), NULL);
2522 if (stat(device_node, &stats) != 0)
2523 break;
2524 if (!S_ISBLK(stats.st_mode) && !S_ISCHR(stats.st_mode))
2525 break;
2526
2527 /* export the tags to a directory as symlinks, allowing otherwise dead nodes to be tagged */
2528 if (tags) {
2529 STRV_FOREACH(t, tags) {
2530 _cleanup_free_ char *unescaped_filename = NULL;
2531
2532 strscpyl(tags_dir, sizeof(tags_dir), "/run/udev/static_node-tags/", *t, "/", NULL);
2533 r = mkdir_p(tags_dir, 0755);
2534 if (r < 0)
2535 return log_error_errno(r, "failed to create %s: %m", tags_dir);
2536
2537 unescaped_filename = xescape(rules_str(rules, cur->key.value_off), "/.");
2538
2539 strscpyl(tag_symlink, sizeof(tag_symlink), tags_dir, unescaped_filename, NULL);
2540 r = symlink(device_node, tag_symlink);
2541 if (r < 0 && errno != EEXIST)
2542 return log_error_errno(errno, "failed to create symlink %s -> %s: %m",
2543 tag_symlink, device_node);
2544 }
2545 }
2546
2547 /* don't touch the permissions if only the tags were set */
2548 if (mode == 0 && uid == 0 && gid == 0)
2549 break;
2550
2551 if (mode == 0) {
2552 if (gid > 0)
2553 mode = 0660;
2554 else
2555 mode = 0600;
2556 }
2557 if (mode != (stats.st_mode & 01777)) {
2558 r = chmod(device_node, mode);
2559 if (r < 0)
2560 return log_error_errno(errno, "Failed to chmod '%s' %#o: %m",
2561 device_node, mode);
2562 else
2563 log_debug("chmod '%s' %#o", device_node, mode);
2564 }
2565
2566 if ((uid != 0 && uid != stats.st_uid) || (gid != 0 && gid != stats.st_gid)) {
2567 r = chown(device_node, uid, gid);
2568 if (r < 0)
2569 return log_error_errno(errno, "Failed to chown '%s' %u %u: %m",
2570 device_node, uid, gid);
2571 else
2572 log_debug("chown '%s' %u %u", device_node, uid, gid);
2573 }
2574
2575 utimensat(AT_FDCWD, device_node, NULL, 0);
2576 break;
2577 }
2578 case TK_END:
2579 goto finish;
2580 }
2581
2582 cur++;
2583 continue;
2584 next:
2585 /* fast-forward to next rule */
2586 cur = rule + rule->rule.token_count;
2587 continue;
2588 }
2589
2590 finish:
2591 if (f) {
2592 fflush(f);
2593 fchmod(fileno(f), 0644);
2594 if (ferror(f) || rename(path, "/run/udev/static_node-tags") < 0) {
2595 unlink_noerrno("/run/udev/static_node-tags");
2596 unlink_noerrno(path);
2597 return -errno;
2598 }
2599 }
2600
2601 return 0;
2602 }
Unnamed repository; edit this file 'description' to name the repository.