chiark / gitweb /
855a4e4060f4d8ff24889253be341e2e95ac71b2
[elogind.git] / src / udev / udev-rules.c
1 /*
2  * Copyright (C) 2003-2012 Kay Sievers <kay@vrfy.org>
3  *
4  * This program is free software: you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License as published by
6  * the Free Software Foundation, either version 2 of the License, or
7  * (at your option) any later version.
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
16  */
17
18 #include <stddef.h>
19 #include <limits.h>
20 #include <stdlib.h>
21 #include <stdbool.h>
22 #include <string.h>
23 #include <stdio.h>
24 #include <fcntl.h>
25 #include <ctype.h>
26 #include <unistd.h>
27 #include <errno.h>
28 #include <dirent.h>
29 #include <fnmatch.h>
30 #include <time.h>
31
32 #include "udev.h"
33 #include "path-util.h"
34 #include "conf-files.h"
35 #include "strbuf.h"
36 #include "strv.h"
37 #include "util.h"
38
39 #define PREALLOC_TOKEN          2048
40
41 struct uid_gid {
42         unsigned int name_off;
43         union {
44                 uid_t uid;
45                 gid_t gid;
46         };
47 };
48
49 static const char* const rules_dirs[] = {
50         "/etc/udev/rules.d",
51         "/run/udev/rules.d",
52         UDEVLIBEXECDIR "/rules.d",
53         NULL};
54
55 struct udev_rules {
56         struct udev *udev;
57         usec_t dirs_ts_usec;
58         int resolve_names;
59
60         /* every key in the rules file becomes a token */
61         struct token *tokens;
62         unsigned int token_cur;
63         unsigned int token_max;
64
65         /* all key strings are copied and de-duplicated in a single continuous string buffer */
66         struct strbuf *strbuf;
67
68         /* during rule parsing, uid/gid lookup results are cached */
69         struct uid_gid *uids;
70         unsigned int uids_cur;
71         unsigned int uids_max;
72         struct uid_gid *gids;
73         unsigned int gids_cur;
74         unsigned int gids_max;
75 };
76
77 static char *rules_str(struct udev_rules *rules, unsigned int off) {
78         return rules->strbuf->buf + off;
79 }
80
81 static unsigned int rules_add_string(struct udev_rules *rules, const char *s) {
82         return strbuf_add_string(rules->strbuf, s, strlen(s));
83 }
84
85 /* KEY=="", KEY!="", KEY+="", KEY="", KEY:="" */
86 enum operation_type {
87         OP_UNSET,
88
89         OP_MATCH,
90         OP_NOMATCH,
91         OP_MATCH_MAX,
92
93         OP_ADD,
94         OP_ASSIGN,
95         OP_ASSIGN_FINAL,
96 };
97
98 enum string_glob_type {
99         GL_UNSET,
100         GL_PLAIN,                       /* no special chars */
101         GL_GLOB,                        /* shell globs ?,*,[] */
102         GL_SPLIT,                       /* multi-value A|B */
103         GL_SPLIT_GLOB,                  /* multi-value with glob A*|B* */
104         GL_SOMETHING,                   /* commonly used "?*" */
105 };
106
107 enum string_subst_type {
108         SB_UNSET,
109         SB_NONE,
110         SB_FORMAT,
111         SB_SUBSYS,
112 };
113
114 /* tokens of a rule are sorted/handled in this order */
115 enum token_type {
116         TK_UNSET,
117         TK_RULE,
118
119         TK_M_ACTION,                    /* val */
120         TK_M_DEVPATH,                   /* val */
121         TK_M_KERNEL,                    /* val */
122         TK_M_DEVLINK,                   /* val */
123         TK_M_NAME,                      /* val */
124         TK_M_ENV,                       /* val, attr */
125         TK_M_TAG,                       /* val */
126         TK_M_SUBSYSTEM,                 /* val */
127         TK_M_DRIVER,                    /* val */
128         TK_M_WAITFOR,                   /* val */
129         TK_M_ATTR,                      /* val, attr */
130
131         TK_M_PARENTS_MIN,
132         TK_M_KERNELS,                   /* val */
133         TK_M_SUBSYSTEMS,                /* val */
134         TK_M_DRIVERS,                   /* val */
135         TK_M_ATTRS,                     /* val, attr */
136         TK_M_TAGS,                      /* val */
137         TK_M_PARENTS_MAX,
138
139         TK_M_TEST,                      /* val, mode_t */
140         TK_M_EVENT_TIMEOUT,             /* int */
141         TK_M_PROGRAM,                   /* val */
142         TK_M_IMPORT_FILE,               /* val */
143         TK_M_IMPORT_PROG,               /* val */
144         TK_M_IMPORT_BUILTIN,            /* val */
145         TK_M_IMPORT_DB,                 /* val */
146         TK_M_IMPORT_CMDLINE,            /* val */
147         TK_M_IMPORT_PARENT,             /* val */
148         TK_M_RESULT,                    /* val */
149         TK_M_MAX,
150
151         TK_A_STRING_ESCAPE_NONE,
152         TK_A_STRING_ESCAPE_REPLACE,
153         TK_A_DB_PERSIST,
154         TK_A_INOTIFY_WATCH,             /* int */
155         TK_A_DEVLINK_PRIO,              /* int */
156         TK_A_OWNER,                     /* val */
157         TK_A_GROUP,                     /* val */
158         TK_A_MODE,                      /* val */
159         TK_A_OWNER_ID,                  /* uid_t */
160         TK_A_GROUP_ID,                  /* gid_t */
161         TK_A_MODE_ID,                   /* mode_t */
162         TK_A_TAG,                       /* val */
163         TK_A_STATIC_NODE,               /* val */
164         TK_A_SECLABEL,                  /* val, attr */
165         TK_A_ENV,                       /* val, attr */
166         TK_A_NAME,                      /* val */
167         TK_A_DEVLINK,                   /* val */
168         TK_A_ATTR,                      /* val, attr */
169         TK_A_RUN_BUILTIN,               /* val, bool */
170         TK_A_RUN_PROGRAM,               /* val, bool */
171         TK_A_GOTO,                      /* size_t */
172
173         TK_END,
174 };
175
176 /* we try to pack stuff in a way that we take only 12 bytes per token */
177 struct token {
178         union {
179                 unsigned char type;                /* same in rule and key */
180                 struct {
181                         enum token_type type:8;
182                         bool can_set_name:1;
183                         bool has_static_node:1;
184                         unsigned int unused:6;
185                         unsigned short token_count;
186                         unsigned int label_off;
187                         unsigned short filename_off;
188                         unsigned short filename_line;
189                 } rule;
190                 struct {
191                         enum token_type type:8;
192                         enum operation_type op:8;
193                         enum string_glob_type glob:8;
194                         enum string_subst_type subst:4;
195                         enum string_subst_type attrsubst:4;
196                         unsigned int value_off;
197                         union {
198                                 unsigned int attr_off;
199                                 unsigned int rule_goto;
200                                 mode_t  mode;
201                                 uid_t uid;
202                                 gid_t gid;
203                                 int devlink_prio;
204                                 int event_timeout;
205                                 int watch;
206                                 enum udev_builtin_cmd builtin_cmd;
207                         };
208                 } key;
209         };
210 };
211
212 #define MAX_TK                64
213 struct rule_tmp {
214         struct udev_rules *rules;
215         struct token rule;
216         struct token token[MAX_TK];
217         unsigned int token_cur;
218 };
219
220 #ifdef DEBUG
221 static const char *operation_str(enum operation_type type)
222 {
223         static const char *operation_strs[] = {
224                 [OP_UNSET] =            "UNSET",
225                 [OP_MATCH] =            "match",
226                 [OP_NOMATCH] =          "nomatch",
227                 [OP_MATCH_MAX] =        "MATCH_MAX",
228
229                 [OP_ADD] =              "add",
230                 [OP_ASSIGN] =           "assign",
231                 [OP_ASSIGN_FINAL] =     "assign-final",
232 }        ;
233
234         return operation_strs[type];
235 }
236
237 static const char *string_glob_str(enum string_glob_type type)
238 {
239         static const char *string_glob_strs[] = {
240                 [GL_UNSET] =            "UNSET",
241                 [GL_PLAIN] =            "plain",
242                 [GL_GLOB] =             "glob",
243                 [GL_SPLIT] =            "split",
244                 [GL_SPLIT_GLOB] =       "split-glob",
245                 [GL_SOMETHING] =        "split-glob",
246         };
247
248         return string_glob_strs[type];
249 }
250
251 static const char *token_str(enum token_type type)
252 {
253         static const char *token_strs[] = {
254                 [TK_UNSET] =                    "UNSET",
255                 [TK_RULE] =                     "RULE",
256
257                 [TK_M_ACTION] =                 "M ACTION",
258                 [TK_M_DEVPATH] =                "M DEVPATH",
259                 [TK_M_KERNEL] =                 "M KERNEL",
260                 [TK_M_DEVLINK] =                "M DEVLINK",
261                 [TK_M_NAME] =                   "M NAME",
262                 [TK_M_ENV] =                    "M ENV",
263                 [TK_M_TAG] =                    "M TAG",
264                 [TK_M_SUBSYSTEM] =              "M SUBSYSTEM",
265                 [TK_M_DRIVER] =                 "M DRIVER",
266                 [TK_M_WAITFOR] =                "M WAITFOR",
267                 [TK_M_ATTR] =                   "M ATTR",
268
269                 [TK_M_PARENTS_MIN] =            "M PARENTS_MIN",
270                 [TK_M_KERNELS] =                "M KERNELS",
271                 [TK_M_SUBSYSTEMS] =             "M SUBSYSTEMS",
272                 [TK_M_DRIVERS] =                "M DRIVERS",
273                 [TK_M_ATTRS] =                  "M ATTRS",
274                 [TK_M_TAGS] =                   "M TAGS",
275                 [TK_M_PARENTS_MAX] =            "M PARENTS_MAX",
276
277                 [TK_M_TEST] =                   "M TEST",
278                 [TK_M_EVENT_TIMEOUT] =          "M EVENT_TIMEOUT",
279                 [TK_M_PROGRAM] =                "M PROGRAM",
280                 [TK_M_IMPORT_FILE] =            "M IMPORT_FILE",
281                 [TK_M_IMPORT_PROG] =            "M IMPORT_PROG",
282                 [TK_M_IMPORT_BUILTIN] =         "M IMPORT_BUILTIN",
283                 [TK_M_IMPORT_DB] =              "M IMPORT_DB",
284                 [TK_M_IMPORT_CMDLINE] =         "M IMPORT_CMDLINE",
285                 [TK_M_IMPORT_PARENT] =          "M IMPORT_PARENT",
286                 [TK_M_RESULT] =                 "M RESULT",
287                 [TK_M_MAX] =                    "M MAX",
288
289                 [TK_A_STRING_ESCAPE_NONE] =     "A STRING_ESCAPE_NONE",
290                 [TK_A_STRING_ESCAPE_REPLACE] =  "A STRING_ESCAPE_REPLACE",
291                 [TK_A_DB_PERSIST] =             "A DB_PERSIST",
292                 [TK_A_INOTIFY_WATCH] =          "A INOTIFY_WATCH",
293                 [TK_A_DEVLINK_PRIO] =           "A DEVLINK_PRIO",
294                 [TK_A_OWNER] =                  "A OWNER",
295                 [TK_A_GROUP] =                  "A GROUP",
296                 [TK_A_MODE] =                   "A MODE",
297                 [TK_A_OWNER_ID] =               "A OWNER_ID",
298                 [TK_A_GROUP_ID] =               "A GROUP_ID",
299                 [TK_A_STATIC_NODE] =            "A STATIC_NODE",
300                 [TK_A_SECLABEL] =               "A SECLABEL",
301                 [TK_A_MODE_ID] =                "A MODE_ID",
302                 [TK_A_ENV] =                    "A ENV",
303                 [TK_A_TAG] =                    "A ENV",
304                 [TK_A_NAME] =                   "A NAME",
305                 [TK_A_DEVLINK] =                "A DEVLINK",
306                 [TK_A_ATTR] =                   "A ATTR",
307                 [TK_A_RUN_BUILTIN] =            "A RUN_BUILTIN",
308                 [TK_A_RUN_PROGRAM] =            "A RUN_PROGRAM",
309                 [TK_A_GOTO] =                   "A GOTO",
310
311                 [TK_END] =                      "END",
312         };
313
314         return token_strs[type];
315 }
316
317 static void dump_token(struct udev_rules *rules, struct token *token)
318 {
319         enum token_type type = token->type;
320         enum operation_type op = token->key.op;
321         enum string_glob_type glob = token->key.glob;
322         const char *value = str(rules, token->key.value_off);
323         const char *attr = &rules->buf[token->key.attr_off];
324
325         switch (type) {
326         case TK_RULE:
327                 {
328                         const char *tks_ptr = (char *)rules->tokens;
329                         const char *tk_ptr = (char *)token;
330                         unsigned int idx = (tk_ptr - tks_ptr) / sizeof(struct token);
331
332                         log_debug("* RULE %s:%u, token: %u, count: %u, label: '%s'",
333                                   &rules->buf[token->rule.filename_off], token->rule.filename_line,
334                                   idx, token->rule.token_count,
335                                   &rules->buf[token->rule.label_off]);
336                         break;
337                 }
338         case TK_M_ACTION:
339         case TK_M_DEVPATH:
340         case TK_M_KERNEL:
341         case TK_M_SUBSYSTEM:
342         case TK_M_DRIVER:
343         case TK_M_WAITFOR:
344         case TK_M_DEVLINK:
345         case TK_M_NAME:
346         case TK_M_KERNELS:
347         case TK_M_SUBSYSTEMS:
348         case TK_M_DRIVERS:
349         case TK_M_TAGS:
350         case TK_M_PROGRAM:
351         case TK_M_IMPORT_FILE:
352         case TK_M_IMPORT_PROG:
353         case TK_M_IMPORT_DB:
354         case TK_M_IMPORT_CMDLINE:
355         case TK_M_IMPORT_PARENT:
356         case TK_M_RESULT:
357         case TK_A_NAME:
358         case TK_A_DEVLINK:
359         case TK_A_OWNER:
360         case TK_A_GROUP:
361         case TK_A_MODE:
362         case TK_A_RUN_BUILTIN:
363         case TK_A_RUN_PROGRAM:
364                 log_debug("%s %s '%s'(%s)",
365                           token_str(type), operation_str(op), value, string_glob_str(glob));
366                 break;
367         case TK_M_IMPORT_BUILTIN:
368                 log_debug("%s %i '%s'", token_str(type), token->key.builtin_cmd, value);
369                 break;
370         case TK_M_ATTR:
371         case TK_M_ATTRS:
372         case TK_M_ENV:
373         case TK_A_ATTR:
374         case TK_A_ENV:
375                 log_debug("%s %s '%s' '%s'(%s)",
376                           token_str(type), operation_str(op), attr, value, string_glob_str(glob));
377                 break;
378         case TK_M_TAG:
379         case TK_A_TAG:
380                 log_debug("%s %s '%s'", token_str(type), operation_str(op), value);
381                 break;
382         case TK_A_STRING_ESCAPE_NONE:
383         case TK_A_STRING_ESCAPE_REPLACE:
384         case TK_A_DB_PERSIST:
385                 log_debug("%s", token_str(type));
386                 break;
387         case TK_M_TEST:
388                 log_debug("%s %s '%s'(%s) %#o",
389                           token_str(type), operation_str(op), value, string_glob_str(glob), token->key.mode);
390                 break;
391         case TK_A_INOTIFY_WATCH:
392                 log_debug("%s %u", token_str(type), token->key.watch);
393                 break;
394         case TK_A_DEVLINK_PRIO:
395                 log_debug("%s %u", token_str(type), token->key.devlink_prio);
396                 break;
397         case TK_A_OWNER_ID:
398                 log_debug("%s %s %u", token_str(type), operation_str(op), token->key.uid);
399                 break;
400         case TK_A_GROUP_ID:
401                 log_debug("%s %s %u", token_str(type), operation_str(op), token->key.gid);
402                 break;
403         case TK_A_MODE_ID:
404                 log_debug("%s %s %#o", token_str(type), operation_str(op), token->key.mode);
405                 break;
406         case TK_A_STATIC_NODE:
407                 log_debug("%s '%s'", token_str(type), value);
408                 break;
409         case TK_A_SECLABEL:
410                 log_debug("%s %s '%s' '%s'", token_str(type), operation_str(op), attr, value);
411                 break;
412         case TK_M_EVENT_TIMEOUT:
413                 log_debug("%s %u", token_str(type), token->key.event_timeout);
414                 break;
415         case TK_A_GOTO:
416                 log_debug("%s '%s' %u", token_str(type), value, token->key.rule_goto);
417                 break;
418         case TK_END:
419                 log_debug("* %s", token_str(type));
420                 break;
421         case TK_M_PARENTS_MIN:
422         case TK_M_PARENTS_MAX:
423         case TK_M_MAX:
424         case TK_UNSET:
425                 log_debug("unknown type %u", type);
426                 break;
427         }
428 }
429
430 static void dump_rules(struct udev_rules *rules)
431 {
432         unsigned int i;
433
434         log_debug("dumping %u (%zu bytes) tokens, %u (%zu bytes) strings",
435                   rules->token_cur,
436                   rules->token_cur * sizeof(struct token),
437                   rules->buf_count,
438                   rules->buf_cur);
439         for (i = 0; i < rules->token_cur; i++)
440                 dump_token(rules, &rules->tokens[i]);
441 }
442 #else
443 static inline const char *operation_str(enum operation_type type) { return NULL; }
444 static inline const char *token_str(enum token_type type) { return NULL; }
445 static inline void dump_token(struct udev_rules *rules, struct token *token) {}
446 static inline void dump_rules(struct udev_rules *rules) {}
447 #endif /* DEBUG */
448
449 static int add_token(struct udev_rules *rules, struct token *token)
450 {
451         /* grow buffer if needed */
452         if (rules->token_cur+1 >= rules->token_max) {
453                 struct token *tokens;
454                 unsigned int add;
455
456                 /* double the buffer size */
457                 add = rules->token_max;
458                 if (add < 8)
459                         add = 8;
460
461                 tokens = realloc(rules->tokens, (rules->token_max + add ) * sizeof(struct token));
462                 if (tokens == NULL)
463                         return -1;
464                 rules->tokens = tokens;
465                 rules->token_max += add;
466         }
467         memcpy(&rules->tokens[rules->token_cur], token, sizeof(struct token));
468         rules->token_cur++;
469         return 0;
470 }
471
472 static uid_t add_uid(struct udev_rules *rules, const char *owner)
473 {
474         unsigned int i;
475         uid_t uid;
476         unsigned int off;
477
478         /* lookup, if we know it already */
479         for (i = 0; i < rules->uids_cur; i++) {
480                 off = rules->uids[i].name_off;
481                 if (streq(rules_str(rules, off), owner)) {
482                         uid = rules->uids[i].uid;
483                         return uid;
484                 }
485         }
486         uid = util_lookup_user(rules->udev, owner);
487
488         /* grow buffer if needed */
489         if (rules->uids_cur+1 >= rules->uids_max) {
490                 struct uid_gid *uids;
491                 unsigned int add;
492
493                 /* double the buffer size */
494                 add = rules->uids_max;
495                 if (add < 1)
496                         add = 8;
497
498                 uids = realloc(rules->uids, (rules->uids_max + add ) * sizeof(struct uid_gid));
499                 if (uids == NULL)
500                         return uid;
501                 rules->uids = uids;
502                 rules->uids_max += add;
503         }
504         rules->uids[rules->uids_cur].uid = uid;
505         off = rules_add_string(rules, owner);
506         if (off <= 0)
507                 return uid;
508         rules->uids[rules->uids_cur].name_off = off;
509         rules->uids_cur++;
510         return uid;
511 }
512
513 static gid_t add_gid(struct udev_rules *rules, const char *group)
514 {
515         unsigned int i;
516         gid_t gid;
517         unsigned int off;
518
519         /* lookup, if we know it already */
520         for (i = 0; i < rules->gids_cur; i++) {
521                 off = rules->gids[i].name_off;
522                 if (streq(rules_str(rules, off), group)) {
523                         gid = rules->gids[i].gid;
524                         return gid;
525                 }
526         }
527         gid = util_lookup_group(rules->udev, group);
528
529         /* grow buffer if needed */
530         if (rules->gids_cur+1 >= rules->gids_max) {
531                 struct uid_gid *gids;
532                 unsigned int add;
533
534                 /* double the buffer size */
535                 add = rules->gids_max;
536                 if (add < 1)
537                         add = 8;
538
539                 gids = realloc(rules->gids, (rules->gids_max + add ) * sizeof(struct uid_gid));
540                 if (gids == NULL)
541                         return gid;
542                 rules->gids = gids;
543                 rules->gids_max += add;
544         }
545         rules->gids[rules->gids_cur].gid = gid;
546         off = rules_add_string(rules, group);
547         if (off <= 0)
548                 return gid;
549         rules->gids[rules->gids_cur].name_off = off;
550         rules->gids_cur++;
551         return gid;
552 }
553
554 static int import_property_from_string(struct udev_device *dev, char *line)
555 {
556         char *key;
557         char *val;
558         size_t len;
559         struct udev_list_entry *entry;
560
561         /* find key */
562         key = line;
563         while (isspace(key[0]))
564                 key++;
565
566         /* comment or empty line */
567         if (key[0] == '#' || key[0] == '\0')
568                 return -1;
569
570         /* split key/value */
571         val = strchr(key, '=');
572         if (val == NULL)
573                 return -1;
574         val[0] = '\0';
575         val++;
576
577         /* find value */
578         while (isspace(val[0]))
579                 val++;
580
581         /* terminate key */
582         len = strlen(key);
583         if (len == 0)
584                 return -1;
585         while (isspace(key[len-1]))
586                 len--;
587         key[len] = '\0';
588
589         /* terminate value */
590         len = strlen(val);
591         if (len == 0)
592                 return -1;
593         while (isspace(val[len-1]))
594                 len--;
595         val[len] = '\0';
596
597         if (len == 0)
598                 return -1;
599
600         /* unquote */
601         if (val[0] == '"' || val[0] == '\'') {
602                 if (val[len-1] != val[0]) {
603                         log_debug("inconsistent quoting: '%s', skip", line);
604                         return -1;
605                 }
606                 val[len-1] = '\0';
607                 val++;
608         }
609
610         entry = udev_device_add_property(dev, key, val);
611         /* store in db, skip private keys */
612         if (key[0] != '.')
613                 udev_list_entry_set_num(entry, true);
614
615         return 0;
616 }
617
618 static int import_file_into_properties(struct udev_device *dev, const char *filename)
619 {
620         FILE *f;
621         char line[UTIL_LINE_SIZE];
622
623         f = fopen(filename, "re");
624         if (f == NULL)
625                 return -1;
626         while (fgets(line, sizeof(line), f) != NULL)
627                 import_property_from_string(dev, line);
628         fclose(f);
629         return 0;
630 }
631
632 static int import_program_into_properties(struct udev_event *event, const char *program, const sigset_t *sigmask)
633 {
634         struct udev_device *dev = event->dev;
635         char **envp;
636         char result[UTIL_LINE_SIZE];
637         char *line;
638         int err;
639
640         envp = udev_device_get_properties_envp(dev);
641         err = udev_event_spawn(event, program, envp, sigmask, result, sizeof(result));
642         if (err < 0)
643                 return err;
644
645         line = result;
646         while (line != NULL) {
647                 char *pos;
648
649                 pos = strchr(line, '\n');
650                 if (pos != NULL) {
651                         pos[0] = '\0';
652                         pos = &pos[1];
653                 }
654                 import_property_from_string(dev, line);
655                 line = pos;
656         }
657         return 0;
658 }
659
660 static int import_parent_into_properties(struct udev_device *dev, const char *filter)
661 {
662         struct udev_device *dev_parent;
663         struct udev_list_entry *list_entry;
664
665         dev_parent = udev_device_get_parent(dev);
666         if (dev_parent == NULL)
667                 return -1;
668
669         udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(dev_parent)) {
670                 const char *key = udev_list_entry_get_name(list_entry);
671                 const char *val = udev_list_entry_get_value(list_entry);
672
673                 if (fnmatch(filter, key, 0) == 0) {
674                         struct udev_list_entry *entry;
675
676                         entry = udev_device_add_property(dev, key, val);
677                         /* store in db, skip private keys */
678                         if (key[0] != '.')
679                                 udev_list_entry_set_num(entry, true);
680                 }
681         }
682         return 0;
683 }
684
685 #define WAIT_LOOP_PER_SECOND                50
686 static int wait_for_file(struct udev_device *dev, const char *file, int timeout)
687 {
688         char filepath[UTIL_PATH_SIZE];
689         char devicepath[UTIL_PATH_SIZE];
690         struct stat stats;
691         int loop = timeout * WAIT_LOOP_PER_SECOND;
692
693         /* a relative path is a device attribute */
694         devicepath[0] = '\0';
695         if (file[0] != '/') {
696                 strscpyl(devicepath, sizeof(devicepath), udev_device_get_syspath(dev), NULL);
697                 strscpyl(filepath, sizeof(filepath), devicepath, "/", file, NULL);
698                 file = filepath;
699         }
700
701         while (--loop) {
702                 const struct timespec duration = { 0, 1000 * 1000 * 1000 / WAIT_LOOP_PER_SECOND };
703
704                 /* lookup file */
705                 if (stat(file, &stats) == 0) {
706                         log_debug("file '%s' appeared after %i loops", file, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
707                         return 0;
708                 }
709                 /* make sure, the device did not disappear in the meantime */
710                 if (devicepath[0] != '\0' && stat(devicepath, &stats) != 0) {
711                         log_debug("device disappeared while waiting for '%s'", file);
712                         return -2;
713                 }
714                 log_debug("wait for '%s' for %i mseconds", file, 1000 / WAIT_LOOP_PER_SECOND);
715                 nanosleep(&duration, NULL);
716         }
717         log_debug("waiting for '%s' failed", file);
718         return -1;
719 }
720
721 static int attr_subst_subdir(char *attr, size_t len)
722 {
723         bool found = false;
724
725         if (strstr(attr, "/*/")) {
726                 char *pos;
727                 char dirname[UTIL_PATH_SIZE];
728                 const char *tail;
729                 DIR *dir;
730
731                 strscpy(dirname, sizeof(dirname), attr);
732                 pos = strstr(dirname, "/*/");
733                 if (pos == NULL)
734                         return -1;
735                 pos[0] = '\0';
736                 tail = &pos[2];
737                 dir = opendir(dirname);
738                 if (dir != NULL) {
739                         struct dirent *dent;
740
741                         for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
742                                 struct stat stats;
743
744                                 if (dent->d_name[0] == '.')
745                                         continue;
746                                 strscpyl(attr, len, dirname, "/", dent->d_name, tail, NULL);
747                                 if (stat(attr, &stats) == 0) {
748                                         found = true;
749                                         break;
750                                 }
751                         }
752                         closedir(dir);
753                 }
754         }
755
756         return found;
757 }
758
759 static int get_key(struct udev *udev, char **line, char **key, enum operation_type *op, char **value)
760 {
761         char *linepos;
762         char *temp;
763
764         linepos = *line;
765         if (linepos == NULL || linepos[0] == '\0')
766                 return -1;
767
768         /* skip whitespace */
769         while (isspace(linepos[0]) || linepos[0] == ',')
770                 linepos++;
771
772         /* get the key */
773         if (linepos[0] == '\0')
774                 return -1;
775         *key = linepos;
776
777         for (;;) {
778                 linepos++;
779                 if (linepos[0] == '\0')
780                         return -1;
781                 if (isspace(linepos[0]))
782                         break;
783                 if (linepos[0] == '=')
784                         break;
785                 if ((linepos[0] == '+') || (linepos[0] == '!') || (linepos[0] == ':'))
786                         if (linepos[1] == '=')
787                                 break;
788         }
789
790         /* remember end of key */
791         temp = linepos;
792
793         /* skip whitespace after key */
794         while (isspace(linepos[0]))
795                 linepos++;
796         if (linepos[0] == '\0')
797                 return -1;
798
799         /* get operation type */
800         if (linepos[0] == '=' && linepos[1] == '=') {
801                 *op = OP_MATCH;
802                 linepos += 2;
803         } else if (linepos[0] == '!' && linepos[1] == '=') {
804                 *op = OP_NOMATCH;
805                 linepos += 2;
806         } else if (linepos[0] == '+' && linepos[1] == '=') {
807                 *op = OP_ADD;
808                 linepos += 2;
809         } else if (linepos[0] == '=') {
810                 *op = OP_ASSIGN;
811                 linepos++;
812         } else if (linepos[0] == ':' && linepos[1] == '=') {
813                 *op = OP_ASSIGN_FINAL;
814                 linepos += 2;
815         } else
816                 return -1;
817
818         /* terminate key */
819         temp[0] = '\0';
820
821         /* skip whitespace after operator */
822         while (isspace(linepos[0]))
823                 linepos++;
824         if (linepos[0] == '\0')
825                 return -1;
826
827         /* get the value */
828         if (linepos[0] == '"')
829                 linepos++;
830         else
831                 return -1;
832         *value = linepos;
833
834         /* terminate */
835         temp = strchr(linepos, '"');
836         if (!temp)
837                 return -1;
838         temp[0] = '\0';
839         temp++;
840
841         /* move line to next key */
842         *line = temp;
843         return 0;
844 }
845
846 /* extract possible KEY{attr} */
847 static const char *get_key_attribute(struct udev *udev, char *str)
848 {
849         char *pos;
850         char *attr;
851
852         attr = strchr(str, '{');
853         if (attr != NULL) {
854                 attr++;
855                 pos = strchr(attr, '}');
856                 if (pos == NULL) {
857                         log_error("missing closing brace for format");
858                         return NULL;
859                 }
860                 pos[0] = '\0';
861                 return attr;
862         }
863         return NULL;
864 }
865
866 static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
867                         enum operation_type op,
868                         const char *value, const void *data)
869 {
870         struct token *token = &rule_tmp->token[rule_tmp->token_cur];
871         const char *attr = NULL;
872
873         memset(token, 0x00, sizeof(struct token));
874
875         switch (type) {
876         case TK_M_ACTION:
877         case TK_M_DEVPATH:
878         case TK_M_KERNEL:
879         case TK_M_SUBSYSTEM:
880         case TK_M_DRIVER:
881         case TK_M_WAITFOR:
882         case TK_M_DEVLINK:
883         case TK_M_NAME:
884         case TK_M_KERNELS:
885         case TK_M_SUBSYSTEMS:
886         case TK_M_DRIVERS:
887         case TK_M_TAGS:
888         case TK_M_PROGRAM:
889         case TK_M_IMPORT_FILE:
890         case TK_M_IMPORT_PROG:
891         case TK_M_IMPORT_DB:
892         case TK_M_IMPORT_CMDLINE:
893         case TK_M_IMPORT_PARENT:
894         case TK_M_RESULT:
895         case TK_A_OWNER:
896         case TK_A_GROUP:
897         case TK_A_MODE:
898         case TK_A_DEVLINK:
899         case TK_A_NAME:
900         case TK_A_GOTO:
901         case TK_M_TAG:
902         case TK_A_TAG:
903         case TK_A_STATIC_NODE:
904                 token->key.value_off = rules_add_string(rule_tmp->rules, value);
905                 break;
906         case TK_M_IMPORT_BUILTIN:
907                 token->key.value_off = rules_add_string(rule_tmp->rules, value);
908                 token->key.builtin_cmd = *(enum udev_builtin_cmd *)data;
909                 break;
910         case TK_M_ENV:
911         case TK_M_ATTR:
912         case TK_M_ATTRS:
913         case TK_A_ATTR:
914         case TK_A_ENV:
915         case TK_A_SECLABEL:
916                 attr = data;
917                 token->key.value_off = rules_add_string(rule_tmp->rules, value);
918                 token->key.attr_off = rules_add_string(rule_tmp->rules, attr);
919                 break;
920         case TK_M_TEST:
921                 token->key.value_off = rules_add_string(rule_tmp->rules, value);
922                 if (data != NULL)
923                         token->key.mode = *(mode_t *)data;
924                 break;
925         case TK_A_STRING_ESCAPE_NONE:
926         case TK_A_STRING_ESCAPE_REPLACE:
927         case TK_A_DB_PERSIST:
928                 break;
929         case TK_A_RUN_BUILTIN:
930         case TK_A_RUN_PROGRAM:
931                 token->key.builtin_cmd = *(enum udev_builtin_cmd *)data;
932                 token->key.value_off = rules_add_string(rule_tmp->rules, value);
933                 break;
934         case TK_A_INOTIFY_WATCH:
935         case TK_A_DEVLINK_PRIO:
936                 token->key.devlink_prio = *(int *)data;
937                 break;
938         case TK_A_OWNER_ID:
939                 token->key.uid = *(uid_t *)data;
940                 break;
941         case TK_A_GROUP_ID:
942                 token->key.gid = *(gid_t *)data;
943                 break;
944         case TK_A_MODE_ID:
945                 token->key.mode = *(mode_t *)data;
946                 break;
947         case TK_M_EVENT_TIMEOUT:
948                 token->key.event_timeout = *(int *)data;
949                 break;
950         case TK_RULE:
951         case TK_M_PARENTS_MIN:
952         case TK_M_PARENTS_MAX:
953         case TK_M_MAX:
954         case TK_END:
955         case TK_UNSET:
956                 log_error("wrong type %u", type);
957                 return -1;
958         }
959
960         if (value != NULL && type < TK_M_MAX) {
961                 /* check if we need to split or call fnmatch() while matching rules */
962                 enum string_glob_type glob;
963                 int has_split;
964                 int has_glob;
965
966                 has_split = (strchr(value, '|') != NULL);
967                 has_glob = string_is_glob(value);
968                 if (has_split && has_glob) {
969                         glob = GL_SPLIT_GLOB;
970                 } else if (has_split) {
971                         glob = GL_SPLIT;
972                 } else if (has_glob) {
973                         if (streq(value, "?*"))
974                                 glob = GL_SOMETHING;
975                         else
976                                 glob = GL_GLOB;
977                 } else {
978                         glob = GL_PLAIN;
979                 }
980                 token->key.glob = glob;
981         }
982
983         if (value != NULL && type > TK_M_MAX) {
984                 /* check if assigned value has substitution chars */
985                 if (value[0] == '[')
986                         token->key.subst = SB_SUBSYS;
987                 else if (strchr(value, '%') != NULL || strchr(value, '$') != NULL)
988                         token->key.subst = SB_FORMAT;
989                 else
990                         token->key.subst = SB_NONE;
991         }
992
993         if (attr != NULL) {
994                 /* check if property/attribute name has substitution chars */
995                 if (attr[0] == '[')
996                         token->key.attrsubst = SB_SUBSYS;
997                 else if (strchr(attr, '%') != NULL || strchr(attr, '$') != NULL)
998                         token->key.attrsubst = SB_FORMAT;
999                 else
1000                         token->key.attrsubst = SB_NONE;
1001         }
1002
1003         token->key.type = type;
1004         token->key.op = op;
1005         rule_tmp->token_cur++;
1006         if (rule_tmp->token_cur >= ELEMENTSOF(rule_tmp->token)) {
1007                 log_error("temporary rule array too small");
1008                 return -1;
1009         }
1010         return 0;
1011 }
1012
1013 static int sort_token(struct udev_rules *rules, struct rule_tmp *rule_tmp)
1014 {
1015         unsigned int i;
1016         unsigned int start = 0;
1017         unsigned int end = rule_tmp->token_cur;
1018
1019         for (i = 0; i < rule_tmp->token_cur; i++) {
1020                 enum token_type next_val = TK_UNSET;
1021                 unsigned int next_idx = 0;
1022                 unsigned int j;
1023
1024                 /* find smallest value */
1025                 for (j = start; j < end; j++) {
1026                         if (rule_tmp->token[j].type == TK_UNSET)
1027                                 continue;
1028                         if (next_val == TK_UNSET || rule_tmp->token[j].type < next_val) {
1029                                 next_val = rule_tmp->token[j].type;
1030                                 next_idx = j;
1031                         }
1032                 }
1033
1034                 /* add token and mark done */
1035                 if (add_token(rules, &rule_tmp->token[next_idx]) != 0)
1036                         return -1;
1037                 rule_tmp->token[next_idx].type = TK_UNSET;
1038
1039                 /* shrink range */
1040                 if (next_idx == start)
1041                         start++;
1042                 if (next_idx+1 == end)
1043                         end--;
1044         }
1045         return 0;
1046 }
1047
1048 static int add_rule(struct udev_rules *rules, char *line,
1049                     const char *filename, unsigned int filename_off, unsigned int lineno)
1050 {
1051         char *linepos;
1052         const char *attr;
1053         struct rule_tmp rule_tmp;
1054
1055         memset(&rule_tmp, 0x00, sizeof(struct rule_tmp));
1056         rule_tmp.rules = rules;
1057         rule_tmp.rule.type = TK_RULE;
1058         /* the offset in the rule is limited to unsigned short */
1059         if (filename_off < USHRT_MAX)
1060                 rule_tmp.rule.rule.filename_off = filename_off;
1061         rule_tmp.rule.rule.filename_line = lineno;
1062
1063         linepos = line;
1064         for (;;) {
1065                 char *key;
1066                 char *value;
1067                 enum operation_type op;
1068
1069                 if (get_key(rules->udev, &linepos, &key, &op, &value) != 0) {
1070                         /* Avoid erroring on trailing whitespace. This is probably rare
1071                          * so save the work for the error case instead of always trying
1072                          * to strip the trailing whitespace with strstrip(). */
1073                         while (isblank(*linepos))
1074                                 linepos++;
1075
1076                         /* If we aren't at the end of the line, this is a parsing error.
1077                          * Make a best effort to describe where the problem is. */
1078                         if (*linepos != '\n') {
1079                                 char buf[2] = {linepos[1]};
1080                                 _cleanup_free_ char *tmp;
1081
1082                                 tmp = cescape(buf);
1083                                 log_error("invalid key/value pair in file %s on line %u,"
1084                                           "starting at character %tu ('%s')\n",
1085                                           filename, lineno, linepos - line + 1, tmp);
1086                                 if (linepos[1] == '#')
1087                                         log_error("hint: comments can only start at beginning of line");
1088                         }
1089                         break;
1090                 }
1091
1092                 if (streq(key, "ACTION")) {
1093                         if (op > OP_MATCH_MAX) {
1094                                 log_error("invalid ACTION operation");
1095                                 goto invalid;
1096                         }
1097                         rule_add_key(&rule_tmp, TK_M_ACTION, op, value, NULL);
1098                         continue;
1099                 }
1100
1101                 if (streq(key, "DEVPATH")) {
1102                         if (op > OP_MATCH_MAX) {
1103                                 log_error("invalid DEVPATH operation");
1104                                 goto invalid;
1105                         }
1106                         rule_add_key(&rule_tmp, TK_M_DEVPATH, op, value, NULL);
1107                         continue;
1108                 }
1109
1110                 if (streq(key, "KERNEL")) {
1111                         if (op > OP_MATCH_MAX) {
1112                                 log_error("invalid KERNEL operation");
1113                                 goto invalid;
1114                         }
1115                         rule_add_key(&rule_tmp, TK_M_KERNEL, op, value, NULL);
1116                         continue;
1117                 }
1118
1119                 if (streq(key, "SUBSYSTEM")) {
1120                         if (op > OP_MATCH_MAX) {
1121                                 log_error("invalid SUBSYSTEM operation");
1122                                 goto invalid;
1123                         }
1124                         /* bus, class, subsystem events should all be the same */
1125                         if (streq(value, "subsystem") ||
1126                             streq(value, "bus") ||
1127                             streq(value, "class")) {
1128                                 if (streq(value, "bus") || streq(value, "class"))
1129                                         log_error("'%s' must be specified as 'subsystem' "
1130                                             "please fix it in %s:%u", value, filename, lineno);
1131                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, "subsystem|class|bus", NULL);
1132                         } else
1133                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, value, NULL);
1134                         continue;
1135                 }
1136
1137                 if (streq(key, "DRIVER")) {
1138                         if (op > OP_MATCH_MAX) {
1139                                 log_error("invalid DRIVER operation");
1140                                 goto invalid;
1141                         }
1142                         rule_add_key(&rule_tmp, TK_M_DRIVER, op, value, NULL);
1143                         continue;
1144                 }
1145
1146                 if (startswith(key, "ATTR{")) {
1147                         attr = get_key_attribute(rules->udev, key + sizeof("ATTR")-1);
1148                         if (attr == NULL) {
1149                                 log_error("error parsing ATTR attribute");
1150                                 goto invalid;
1151                         }
1152                         if (op < OP_MATCH_MAX) {
1153                                 rule_add_key(&rule_tmp, TK_M_ATTR, op, value, attr);
1154                         } else {
1155                                 rule_add_key(&rule_tmp, TK_A_ATTR, op, value, attr);
1156                         }
1157                         continue;
1158                 }
1159
1160                 if (startswith(key, "SECLABEL{")) {
1161                         attr = get_key_attribute(rules->udev, key + sizeof("SECLABEL")-1);
1162                         if (!attr) {
1163                                 log_error("error parsing SECLABEL attribute");
1164                                 goto invalid;
1165                         }
1166
1167                         rule_add_key(&rule_tmp, TK_A_SECLABEL, op, value, attr);
1168                         continue;
1169                 }
1170
1171                 if (streq(key, "KERNELS")) {
1172                         if (op > OP_MATCH_MAX) {
1173                                 log_error("invalid KERNELS operation");
1174                                 goto invalid;
1175                         }
1176                         rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1177                         continue;
1178                 }
1179
1180                 if (streq(key, "SUBSYSTEMS")) {
1181                         if (op > OP_MATCH_MAX) {
1182                                 log_error("invalid SUBSYSTEMS operation");
1183                                 goto invalid;
1184                         }
1185                         rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1186                         continue;
1187                 }
1188
1189                 if (streq(key, "DRIVERS")) {
1190                         if (op > OP_MATCH_MAX) {
1191                                 log_error("invalid DRIVERS operation");
1192                                 goto invalid;
1193                         }
1194                         rule_add_key(&rule_tmp, TK_M_DRIVERS, op, value, NULL);
1195                         continue;
1196                 }
1197
1198                 if (startswith(key, "ATTRS{")) {
1199                         if (op > OP_MATCH_MAX) {
1200                                 log_error("invalid ATTRS operation");
1201                                 goto invalid;
1202                         }
1203                         attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);
1204                         if (attr == NULL) {
1205                                 log_error("error parsing ATTRS attribute");
1206                                 goto invalid;
1207                         }
1208                         if (startswith(attr, "device/"))
1209                                 log_error("the 'device' link may not be available in a future kernel, "
1210                                     "please fix it in %s:%u", filename, lineno);
1211                         else if (strstr(attr, "../") != NULL)
1212                                 log_error("do not reference parent sysfs directories directly, "
1213                                     "it may break with a future kernel, please fix it in %s:%u", filename, lineno);
1214                         rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1215                         continue;
1216                 }
1217
1218                 if (streq(key, "TAGS")) {
1219                         if (op > OP_MATCH_MAX) {
1220                                 log_error("invalid TAGS operation");
1221                                 goto invalid;
1222                         }
1223                         rule_add_key(&rule_tmp, TK_M_TAGS, op, value, NULL);
1224                         continue;
1225                 }
1226
1227                 if (startswith(key, "ENV{")) {
1228                         attr = get_key_attribute(rules->udev, key + sizeof("ENV")-1);
1229                         if (attr == NULL) {
1230                                 log_error("error parsing ENV attribute");
1231                                 goto invalid;
1232                         }
1233                         if (op < OP_MATCH_MAX) {
1234                                 if (rule_add_key(&rule_tmp, TK_M_ENV, op, value, attr) != 0)
1235                                         goto invalid;
1236                         } else {
1237                                 static const char *blacklist[] = {
1238                                         "ACTION",
1239                                         "SUBSYSTEM",
1240                                         "DEVTYPE",
1241                                         "MAJOR",
1242                                         "MINOR",
1243                                         "DRIVER",
1244                                         "IFINDEX",
1245                                         "DEVNAME",
1246                                         "DEVLINKS",
1247                                         "DEVPATH",
1248                                         "TAGS",
1249                                 };
1250                                 unsigned int i;
1251
1252                                 for (i = 0; i < ELEMENTSOF(blacklist); i++) {
1253                                         if (!streq(attr, blacklist[i]))
1254                                                 continue;
1255                                         log_error("invalid ENV attribute, '%s' can not be set %s:%u", attr, filename, lineno);
1256                                         goto invalid;
1257                                 }
1258                                 if (rule_add_key(&rule_tmp, TK_A_ENV, op, value, attr) != 0)
1259                                         goto invalid;
1260                         }
1261                         continue;
1262                 }
1263
1264                 if (streq(key, "TAG")) {
1265                         if (op < OP_MATCH_MAX)
1266                                 rule_add_key(&rule_tmp, TK_M_TAG, op, value, NULL);
1267                         else
1268                                 rule_add_key(&rule_tmp, TK_A_TAG, op, value, NULL);
1269                         continue;
1270                 }
1271
1272                 if (streq(key, "PROGRAM")) {
1273                         rule_add_key(&rule_tmp, TK_M_PROGRAM, op, value, NULL);
1274                         continue;
1275                 }
1276
1277                 if (streq(key, "RESULT")) {
1278                         if (op > OP_MATCH_MAX) {
1279                                 log_error("invalid RESULT operation");
1280                                 goto invalid;
1281                         }
1282                         rule_add_key(&rule_tmp, TK_M_RESULT, op, value, NULL);
1283                         continue;
1284                 }
1285
1286                 if (startswith(key, "IMPORT")) {
1287                         attr = get_key_attribute(rules->udev, key + sizeof("IMPORT")-1);
1288                         if (attr == NULL) {
1289                                 log_error("IMPORT{} type missing, ignoring IMPORT %s:%u", filename, lineno);
1290                                 continue;
1291                         }
1292                         if (streq(attr, "program")) {
1293                                 /* find known built-in command */
1294                                 if (value[0] != '/') {
1295                                         enum udev_builtin_cmd cmd;
1296
1297                                         cmd = udev_builtin_lookup(value);
1298                                         if (cmd < UDEV_BUILTIN_MAX) {
1299                                                 log_debug("IMPORT found builtin '%s', replacing %s:%u",
1300                                                           value, filename, lineno);
1301                                                 rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, value, &cmd);
1302                                                 continue;
1303                                         }
1304                                 }
1305                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1306                         } else if (streq(attr, "builtin")) {
1307                                 enum udev_builtin_cmd cmd = udev_builtin_lookup(value);
1308
1309                                 if (cmd < UDEV_BUILTIN_MAX)
1310                                         rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, value, &cmd);
1311                                 else
1312                                         log_error("IMPORT{builtin}: '%s' unknown %s:%u", value, filename, lineno);
1313                         } else if (streq(attr, "file")) {
1314                                 rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1315                         } else if (streq(attr, "db")) {
1316                                 rule_add_key(&rule_tmp, TK_M_IMPORT_DB, op, value, NULL);
1317                         } else if (streq(attr, "cmdline")) {
1318                                 rule_add_key(&rule_tmp, TK_M_IMPORT_CMDLINE, op, value, NULL);
1319                         } else if (streq(attr, "parent")) {
1320                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PARENT, op, value, NULL);
1321                         } else
1322                                 log_error("IMPORT{} unknown type, ignoring IMPORT %s:%u", filename, lineno);
1323                         continue;
1324                 }
1325
1326                 if (startswith(key, "TEST")) {
1327                         mode_t mode = 0;
1328
1329                         if (op > OP_MATCH_MAX) {
1330                                 log_error("invalid TEST operation");
1331                                 goto invalid;
1332                         }
1333                         attr = get_key_attribute(rules->udev, key + sizeof("TEST")-1);
1334                         if (attr != NULL) {
1335                                 mode = strtol(attr, NULL, 8);
1336                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, &mode);
1337                         } else {
1338                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, NULL);
1339                         }
1340                         continue;
1341                 }
1342
1343                 if (startswith(key, "RUN")) {
1344                         attr = get_key_attribute(rules->udev, key + sizeof("RUN")-1);
1345                         if (attr == NULL)
1346                                 attr = "program";
1347
1348                         if (streq(attr, "builtin")) {
1349                                 enum udev_builtin_cmd cmd = udev_builtin_lookup(value);
1350
1351                                 if (cmd < UDEV_BUILTIN_MAX)
1352                                         rule_add_key(&rule_tmp, TK_A_RUN_BUILTIN, op, value, &cmd);
1353                                 else
1354                                         log_error("IMPORT{builtin}: '%s' unknown %s:%u", value, filename, lineno);
1355                         } else if (streq(attr, "program")) {
1356                                 enum udev_builtin_cmd cmd = UDEV_BUILTIN_MAX;
1357
1358                                 rule_add_key(&rule_tmp, TK_A_RUN_PROGRAM, op, value, &cmd);
1359                         } else {
1360                                 log_error("RUN{} unknown type, ignoring RUN %s:%u", filename, lineno);
1361                         }
1362
1363                         continue;
1364                 }
1365
1366                 if (streq(key, "WAIT_FOR") || streq(key, "WAIT_FOR_SYSFS")) {
1367                         rule_add_key(&rule_tmp, TK_M_WAITFOR, 0, value, NULL);
1368                         continue;
1369                 }
1370
1371                 if (streq(key, "LABEL")) {
1372                         rule_tmp.rule.rule.label_off = rules_add_string(rules, value);
1373                         continue;
1374                 }
1375
1376                 if (streq(key, "GOTO")) {
1377                         rule_add_key(&rule_tmp, TK_A_GOTO, 0, value, NULL);
1378                         continue;
1379                 }
1380
1381                 if (startswith(key, "NAME")) {
1382                         if (op < OP_MATCH_MAX) {
1383                                 rule_add_key(&rule_tmp, TK_M_NAME, op, value, NULL);
1384                         } else {
1385                                 if (streq(value, "%k")) {
1386                                         log_error("NAME=\"%%k\" is ignored, because it breaks kernel supplied names, "
1387                                             "please remove it from %s:%u\n", filename, lineno);
1388                                         continue;
1389                                 }
1390                                 if (value[0] == '\0') {
1391                                         log_debug("NAME=\"\" is ignored, because udev will not delete any device nodes, "
1392                                                   "please remove it from %s:%u\n", filename, lineno);
1393                                         continue;
1394                                 }
1395                                 rule_add_key(&rule_tmp, TK_A_NAME, op, value, NULL);
1396                         }
1397                         rule_tmp.rule.rule.can_set_name = true;
1398                         continue;
1399                 }
1400
1401                 if (streq(key, "SYMLINK")) {
1402                         if (op < OP_MATCH_MAX)
1403                                 rule_add_key(&rule_tmp, TK_M_DEVLINK, op, value, NULL);
1404                         else
1405                                 rule_add_key(&rule_tmp, TK_A_DEVLINK, op, value, NULL);
1406                         rule_tmp.rule.rule.can_set_name = true;
1407                         continue;
1408                 }
1409
1410                 if (streq(key, "OWNER")) {
1411                         uid_t uid;
1412                         char *endptr;
1413
1414                         uid = strtoul(value, &endptr, 10);
1415                         if (endptr[0] == '\0') {
1416                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1417                         } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1418                                 uid = add_uid(rules, value);
1419                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1420                         } else if (rules->resolve_names >= 0) {
1421                                 rule_add_key(&rule_tmp, TK_A_OWNER, op, value, NULL);
1422                         }
1423                         rule_tmp.rule.rule.can_set_name = true;
1424                         continue;
1425                 }
1426
1427                 if (streq(key, "GROUP")) {
1428                         gid_t gid;
1429                         char *endptr;
1430
1431                         gid = strtoul(value, &endptr, 10);
1432                         if (endptr[0] == '\0') {
1433                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1434                         } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1435                                 gid = add_gid(rules, value);
1436                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1437                         } else if (rules->resolve_names >= 0) {
1438                                 rule_add_key(&rule_tmp, TK_A_GROUP, op, value, NULL);
1439                         }
1440                         rule_tmp.rule.rule.can_set_name = true;
1441                         continue;
1442                 }
1443
1444                 if (streq(key, "MODE")) {
1445                         mode_t mode;
1446                         char *endptr;
1447
1448                         mode = strtol(value, &endptr, 8);
1449                         if (endptr[0] == '\0')
1450                                 rule_add_key(&rule_tmp, TK_A_MODE_ID, op, NULL, &mode);
1451                         else
1452                                 rule_add_key(&rule_tmp, TK_A_MODE, op, value, NULL);
1453                         rule_tmp.rule.rule.can_set_name = true;
1454                         continue;
1455                 }
1456
1457                 if (streq(key, "OPTIONS")) {
1458                         const char *pos;
1459
1460                         pos = strstr(value, "link_priority=");
1461                         if (pos != NULL) {
1462                                 int prio = atoi(&pos[strlen("link_priority=")]);
1463
1464                                 rule_add_key(&rule_tmp, TK_A_DEVLINK_PRIO, op, NULL, &prio);
1465                         }
1466
1467                         pos = strstr(value, "event_timeout=");
1468                         if (pos != NULL) {
1469                                 int tout = atoi(&pos[strlen("event_timeout=")]);
1470
1471                                 rule_add_key(&rule_tmp, TK_M_EVENT_TIMEOUT, op, NULL, &tout);
1472                         }
1473
1474                         pos = strstr(value, "string_escape=");
1475                         if (pos != NULL) {
1476                                 pos = &pos[strlen("string_escape=")];
1477                                 if (startswith(pos, "none"))
1478                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_NONE, op, NULL, NULL);
1479                                 else if (startswith(pos, "replace"))
1480                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_REPLACE, op, NULL, NULL);
1481                         }
1482
1483                         pos = strstr(value, "db_persist");
1484                         if (pos != NULL)
1485                                 rule_add_key(&rule_tmp, TK_A_DB_PERSIST, op, NULL, NULL);
1486
1487                         pos = strstr(value, "nowatch");
1488                         if (pos != NULL) {
1489                                 const int off = 0;
1490
1491                                 rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &off);
1492                         } else {
1493                                 pos = strstr(value, "watch");
1494                                 if (pos != NULL) {
1495                                         const int on = 1;
1496
1497                                         rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &on);
1498                                 }
1499                         }
1500
1501                         pos = strstr(value, "static_node=");
1502                         if (pos != NULL) {
1503                                 rule_add_key(&rule_tmp, TK_A_STATIC_NODE, op, &pos[strlen("static_node=")], NULL);
1504                                 rule_tmp.rule.rule.has_static_node = true;
1505                         }
1506
1507                         continue;
1508                 }
1509
1510                 log_error("unknown key '%s' in %s:%u", key, filename, lineno);
1511                 goto invalid;
1512         }
1513
1514         /* add rule token */
1515         rule_tmp.rule.rule.token_count = 1 + rule_tmp.token_cur;
1516         if (add_token(rules, &rule_tmp.rule) != 0)
1517                 goto invalid;
1518
1519         /* add tokens to list, sorted by type */
1520         if (sort_token(rules, &rule_tmp) != 0)
1521                 goto invalid;
1522
1523         return 0;
1524 invalid:
1525         log_error("invalid rule '%s:%u'", filename, lineno);
1526         return -1;
1527 }
1528
1529 static int parse_file(struct udev_rules *rules, const char *filename)
1530 {
1531         FILE *f;
1532         unsigned int first_token;
1533         unsigned int filename_off;
1534         char line[UTIL_LINE_SIZE];
1535         int line_nr = 0;
1536         unsigned int i;
1537
1538         if (null_or_empty_path(filename)) {
1539                 log_debug("skip empty file: %s", filename);
1540                 return 0;
1541         }
1542         log_debug("read rules file: %s", filename);
1543
1544         f = fopen(filename, "re");
1545         if (f == NULL)
1546                 return -1;
1547
1548         first_token = rules->token_cur;
1549         filename_off = rules_add_string(rules, filename);
1550
1551         while (fgets(line, sizeof(line), f) != NULL) {
1552                 char *key;
1553                 size_t len;
1554
1555                 /* skip whitespace */
1556                 line_nr++;
1557                 key = line;
1558                 while (isspace(key[0]))
1559                         key++;
1560
1561                 /* comment */
1562                 if (key[0] == '#')
1563                         continue;
1564
1565                 len = strlen(line);
1566                 if (len < 3)
1567                         continue;
1568
1569                 /* continue reading if backslash+newline is found */
1570                 while (line[len-2] == '\\') {
1571                         if (fgets(&line[len-2], (sizeof(line)-len)+2, f) == NULL)
1572                                 break;
1573                         if (strlen(&line[len-2]) < 2)
1574                                 break;
1575                         line_nr++;
1576                         len = strlen(line);
1577                 }
1578
1579                 if (len+1 >= sizeof(line)) {
1580                         log_error("line too long '%s':%u, ignored", filename, line_nr);
1581                         continue;
1582                 }
1583                 add_rule(rules, key, filename, filename_off, line_nr);
1584         }
1585         fclose(f);
1586
1587         /* link GOTOs to LABEL rules in this file to be able to fast-forward */
1588         for (i = first_token+1; i < rules->token_cur; i++) {
1589                 if (rules->tokens[i].type == TK_A_GOTO) {
1590                         char *label = rules_str(rules, rules->tokens[i].key.value_off);
1591                         unsigned int j;
1592
1593                         for (j = i+1; j < rules->token_cur; j++) {
1594                                 if (rules->tokens[j].type != TK_RULE)
1595                                         continue;
1596                                 if (rules->tokens[j].rule.label_off == 0)
1597                                         continue;
1598                                 if (!streq(label, rules_str(rules, rules->tokens[j].rule.label_off)))
1599                                         continue;
1600                                 rules->tokens[i].key.rule_goto = j;
1601                                 break;
1602                         }
1603                         if (rules->tokens[i].key.rule_goto == 0)
1604                                 log_error("GOTO '%s' has no matching label in: '%s'", label, filename);
1605                 }
1606         }
1607         return 0;
1608 }
1609
1610 struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
1611 {
1612         struct udev_rules *rules;
1613         struct udev_list file_list;
1614         struct token end_token;
1615         char **files, **f;
1616         int r;
1617
1618         rules = calloc(1, sizeof(struct udev_rules));
1619         if (rules == NULL)
1620                 return NULL;
1621         rules->udev = udev;
1622         rules->resolve_names = resolve_names;
1623         udev_list_init(udev, &file_list, true);
1624
1625         /* init token array and string buffer */
1626         rules->tokens = malloc(PREALLOC_TOKEN * sizeof(struct token));
1627         if (rules->tokens == NULL)
1628                 return udev_rules_unref(rules);
1629         rules->token_max = PREALLOC_TOKEN;
1630
1631         rules->strbuf = strbuf_new();
1632         if (!rules->strbuf)
1633                 return udev_rules_unref(rules);
1634
1635         udev_rules_check_timestamp(rules);
1636
1637         r = conf_files_list_strv(&files, ".rules", NULL, rules_dirs);
1638         if (r < 0) {
1639                 log_error("failed to enumerate rules files: %s", strerror(-r));
1640                 return udev_rules_unref(rules);
1641         }
1642
1643         /*
1644          * The offset value in the rules strct is limited; add all
1645          * rules file names to the beginning of the string buffer.
1646          */
1647         STRV_FOREACH(f, files)
1648                 rules_add_string(rules, *f);
1649
1650         STRV_FOREACH(f, files)
1651                 parse_file(rules, *f);
1652
1653         strv_free(files);
1654
1655         memset(&end_token, 0x00, sizeof(struct token));
1656         end_token.type = TK_END;
1657         add_token(rules, &end_token);
1658         log_debug("rules contain %zu bytes tokens (%u * %zu bytes), %zu bytes strings",
1659                   rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->strbuf->len);
1660
1661         /* cleanup temporary strbuf data */
1662         log_debug("%zu strings (%zu bytes), %zu de-duplicated (%zu bytes), %zu trie nodes used",
1663                   rules->strbuf->in_count, rules->strbuf->in_len,
1664                   rules->strbuf->dedup_count, rules->strbuf->dedup_len, rules->strbuf->nodes_count);
1665         strbuf_complete(rules->strbuf);
1666
1667         /* cleanup uid/gid cache */
1668         free(rules->uids);
1669         rules->uids = NULL;
1670         rules->uids_cur = 0;
1671         rules->uids_max = 0;
1672         free(rules->gids);
1673         rules->gids = NULL;
1674         rules->gids_cur = 0;
1675         rules->gids_max = 0;
1676
1677         dump_rules(rules);
1678         return rules;
1679 }
1680
1681 struct udev_rules *udev_rules_unref(struct udev_rules *rules)
1682 {
1683         if (rules == NULL)
1684                 return NULL;
1685         free(rules->tokens);
1686         strbuf_cleanup(rules->strbuf);
1687         free(rules->uids);
1688         free(rules->gids);
1689         free(rules);
1690         return NULL;
1691 }
1692
1693 bool udev_rules_check_timestamp(struct udev_rules *rules)
1694 {
1695         if (!rules)
1696                 return false;
1697
1698         return paths_check_timestamp(rules_dirs, &rules->dirs_ts_usec, true);
1699 }
1700
1701 static int match_key(struct udev_rules *rules, struct token *token, const char *val)
1702 {
1703         char *key_value = rules_str(rules, token->key.value_off);
1704         char *pos;
1705         bool match = false;
1706
1707         if (val == NULL)
1708                 val = "";
1709
1710         switch (token->key.glob) {
1711         case GL_PLAIN:
1712                 match = (streq(key_value, val));
1713                 break;
1714         case GL_GLOB:
1715                 match = (fnmatch(key_value, val, 0) == 0);
1716                 break;
1717         case GL_SPLIT:
1718                 {
1719                         const char *s;
1720                         size_t len;
1721
1722                         s = rules_str(rules, token->key.value_off);
1723                         len = strlen(val);
1724                         for (;;) {
1725                                 const char *next;
1726
1727                                 next = strchr(s, '|');
1728                                 if (next != NULL) {
1729                                         size_t matchlen = (size_t)(next - s);
1730
1731                                         match = (matchlen == len && strneq(s, val, matchlen));
1732                                         if (match)
1733                                                 break;
1734                                 } else {
1735                                         match = (streq(s, val));
1736                                         break;
1737                                 }
1738                                 s = &next[1];
1739                         }
1740                         break;
1741                 }
1742         case GL_SPLIT_GLOB:
1743                 {
1744                         char value[UTIL_PATH_SIZE];
1745
1746                         strscpy(value, sizeof(value), rules_str(rules, token->key.value_off));
1747                         key_value = value;
1748                         while (key_value != NULL) {
1749                                 pos = strchr(key_value, '|');
1750                                 if (pos != NULL) {
1751                                         pos[0] = '\0';
1752                                         pos = &pos[1];
1753                                 }
1754                                 match = (fnmatch(key_value, val, 0) == 0);
1755                                 if (match)
1756                                         break;
1757                                 key_value = pos;
1758                         }
1759                         break;
1760                 }
1761         case GL_SOMETHING:
1762                 match = (val[0] != '\0');
1763                 break;
1764         case GL_UNSET:
1765                 return -1;
1766         }
1767
1768         if (match && (token->key.op == OP_MATCH))
1769                 return 0;
1770         if (!match && (token->key.op == OP_NOMATCH))
1771                 return 0;
1772         return -1;
1773 }
1774
1775 static int match_attr(struct udev_rules *rules, struct udev_device *dev, struct udev_event *event, struct token *cur)
1776 {
1777         const char *name;
1778         char nbuf[UTIL_NAME_SIZE];
1779         const char *value;
1780         char vbuf[UTIL_NAME_SIZE];
1781         size_t len;
1782
1783         name = rules_str(rules, cur->key.attr_off);
1784         switch (cur->key.attrsubst) {
1785         case SB_FORMAT:
1786                 udev_event_apply_format(event, name, nbuf, sizeof(nbuf));
1787                 name = nbuf;
1788                 /* fall through */
1789         case SB_NONE:
1790                 value = udev_device_get_sysattr_value(dev, name);
1791                 if (value == NULL)
1792                         return -1;
1793                 break;
1794         case SB_SUBSYS:
1795                 if (util_resolve_subsys_kernel(event->udev, name, vbuf, sizeof(vbuf), 1) != 0)
1796                         return -1;
1797                 value = vbuf;
1798                 break;
1799         default:
1800                 return -1;
1801         }
1802
1803         /* remove trailing whitespace, if not asked to match for it */
1804         len = strlen(value);
1805         if (len > 0 && isspace(value[len-1])) {
1806                 const char *key_value;
1807                 size_t klen;
1808
1809                 key_value = rules_str(rules, cur->key.value_off);
1810                 klen = strlen(key_value);
1811                 if (klen > 0 && !isspace(key_value[klen-1])) {
1812                         if (value != vbuf) {
1813                                 strscpy(vbuf, sizeof(vbuf), value);
1814                                 value = vbuf;
1815                         }
1816                         while (len > 0 && isspace(vbuf[--len]))
1817                                 vbuf[len] = '\0';
1818                 }
1819         }
1820
1821         return match_key(rules, cur, value);
1822 }
1823
1824 enum escape_type {
1825         ESCAPE_UNSET,
1826         ESCAPE_NONE,
1827         ESCAPE_REPLACE,
1828 };
1829
1830 int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event, const sigset_t *sigmask)
1831 {
1832         struct token *cur;
1833         struct token *rule;
1834         enum escape_type esc = ESCAPE_UNSET;
1835         bool can_set_name;
1836
1837         if (rules->tokens == NULL)
1838                 return -1;
1839
1840         can_set_name = ((!streq(udev_device_get_action(event->dev), "remove")) &&
1841                         (major(udev_device_get_devnum(event->dev)) > 0 ||
1842                          udev_device_get_ifindex(event->dev) > 0));
1843
1844         /* loop through token list, match, run actions or forward to next rule */
1845         cur = &rules->tokens[0];
1846         rule = cur;
1847         for (;;) {
1848                 dump_token(rules, cur);
1849                 switch (cur->type) {
1850                 case TK_RULE:
1851                         /* current rule */
1852                         rule = cur;
1853                         /* possibly skip rules which want to set NAME, SYMLINK, OWNER, GROUP, MODE */
1854                         if (!can_set_name && rule->rule.can_set_name)
1855                                 goto nomatch;
1856                         esc = ESCAPE_UNSET;
1857                         break;
1858                 case TK_M_ACTION:
1859                         if (match_key(rules, cur, udev_device_get_action(event->dev)) != 0)
1860                                 goto nomatch;
1861                         break;
1862                 case TK_M_DEVPATH:
1863                         if (match_key(rules, cur, udev_device_get_devpath(event->dev)) != 0)
1864                                 goto nomatch;
1865                         break;
1866                 case TK_M_KERNEL:
1867                         if (match_key(rules, cur, udev_device_get_sysname(event->dev)) != 0)
1868                                 goto nomatch;
1869                         break;
1870                 case TK_M_DEVLINK: {
1871                         struct udev_list_entry *list_entry;
1872                         bool match = false;
1873
1874                         udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(event->dev)) {
1875                                 const char *devlink;
1876
1877                                 devlink =  udev_list_entry_get_name(list_entry) + strlen("/dev/");
1878                                 if (match_key(rules, cur, devlink) == 0) {
1879                                         match = true;
1880                                         break;
1881                                 }
1882                         }
1883                         if (!match)
1884                                 goto nomatch;
1885                         break;
1886                 }
1887                 case TK_M_NAME:
1888                         if (match_key(rules, cur, event->name) != 0)
1889                                 goto nomatch;
1890                         break;
1891                 case TK_M_ENV: {
1892                         const char *key_name = rules_str(rules, cur->key.attr_off);
1893                         const char *value;
1894
1895                         value = udev_device_get_property_value(event->dev, key_name);
1896                         if (value == NULL)
1897                                 value = "";
1898                         if (match_key(rules, cur, value))
1899                                 goto nomatch;
1900                         break;
1901                 }
1902                 case TK_M_TAG: {
1903                         struct udev_list_entry *list_entry;
1904                         bool match = false;
1905
1906                         udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(event->dev)) {
1907                                 if (streq(rules_str(rules, cur->key.value_off), udev_list_entry_get_name(list_entry))) {
1908                                         match = true;
1909                                         break;
1910                                 }
1911                         }
1912                         if (!match && (cur->key.op != OP_NOMATCH))
1913                                 goto nomatch;
1914                         break;
1915                 }
1916                 case TK_M_SUBSYSTEM:
1917                         if (match_key(rules, cur, udev_device_get_subsystem(event->dev)) != 0)
1918                                 goto nomatch;
1919                         break;
1920                 case TK_M_DRIVER:
1921                         if (match_key(rules, cur, udev_device_get_driver(event->dev)) != 0)
1922                                 goto nomatch;
1923                         break;
1924                 case TK_M_WAITFOR: {
1925                         char filename[UTIL_PATH_SIZE];
1926                         int found;
1927
1928                         udev_event_apply_format(event, rules_str(rules, cur->key.value_off), filename, sizeof(filename));
1929                         found = (wait_for_file(event->dev, filename, 10) == 0);
1930                         if (!found && (cur->key.op != OP_NOMATCH))
1931                                 goto nomatch;
1932                         break;
1933                 }
1934                 case TK_M_ATTR:
1935                         if (match_attr(rules, event->dev, event, cur) != 0)
1936                                 goto nomatch;
1937                         break;
1938                 case TK_M_KERNELS:
1939                 case TK_M_SUBSYSTEMS:
1940                 case TK_M_DRIVERS:
1941                 case TK_M_ATTRS:
1942                 case TK_M_TAGS: {
1943                         struct token *next;
1944
1945                         /* get whole sequence of parent matches */
1946                         next = cur;
1947                         while (next->type > TK_M_PARENTS_MIN && next->type < TK_M_PARENTS_MAX)
1948                                 next++;
1949
1950                         /* loop over parents */
1951                         event->dev_parent = event->dev;
1952                         for (;;) {
1953                                 struct token *key;
1954
1955                                 /* loop over sequence of parent match keys */
1956                                 for (key = cur; key < next; key++ ) {
1957                                         dump_token(rules, key);
1958                                         switch(key->type) {
1959                                         case TK_M_KERNELS:
1960                                                 if (match_key(rules, key, udev_device_get_sysname(event->dev_parent)) != 0)
1961                                                         goto try_parent;
1962                                                 break;
1963                                         case TK_M_SUBSYSTEMS:
1964                                                 if (match_key(rules, key, udev_device_get_subsystem(event->dev_parent)) != 0)
1965                                                         goto try_parent;
1966                                                 break;
1967                                         case TK_M_DRIVERS:
1968                                                 if (match_key(rules, key, udev_device_get_driver(event->dev_parent)) != 0)
1969                                                         goto try_parent;
1970                                                 break;
1971                                         case TK_M_ATTRS:
1972                                                 if (match_attr(rules, event->dev_parent, event, key) != 0)
1973                                                         goto try_parent;
1974                                                 break;
1975                                         case TK_M_TAGS: {
1976                                                 bool match = udev_device_has_tag(event->dev_parent, rules_str(rules, cur->key.value_off));
1977
1978                                                 if (match && key->key.op == OP_NOMATCH)
1979                                                         goto try_parent;
1980                                                 if (!match && key->key.op == OP_MATCH)
1981                                                         goto try_parent;
1982                                                 break;
1983                                         }
1984                                         default:
1985                                                 goto nomatch;
1986                                         }
1987                                 }
1988                                 break;
1989
1990                         try_parent:
1991                                 event->dev_parent = udev_device_get_parent(event->dev_parent);
1992                                 if (event->dev_parent == NULL)
1993                                         goto nomatch;
1994                         }
1995                         /* move behind our sequence of parent match keys */
1996                         cur = next;
1997                         continue;
1998                 }
1999                 case TK_M_TEST: {
2000                         char filename[UTIL_PATH_SIZE];
2001                         struct stat statbuf;
2002                         int match;
2003
2004                         udev_event_apply_format(event, rules_str(rules, cur->key.value_off), filename, sizeof(filename));
2005                         if (util_resolve_subsys_kernel(event->udev, filename, filename, sizeof(filename), 0) != 0) {
2006                                 if (filename[0] != '/') {
2007                                         char tmp[UTIL_PATH_SIZE];
2008
2009                                         strscpy(tmp, sizeof(tmp), filename);
2010                                         strscpyl(filename, sizeof(filename),
2011                                                       udev_device_get_syspath(event->dev), "/", tmp, NULL);
2012                                 }
2013                         }
2014                         attr_subst_subdir(filename, sizeof(filename));
2015
2016                         match = (stat(filename, &statbuf) == 0);
2017                         if (match && cur->key.mode > 0)
2018                                 match = ((statbuf.st_mode & cur->key.mode) > 0);
2019                         if (match && cur->key.op == OP_NOMATCH)
2020                                 goto nomatch;
2021                         if (!match && cur->key.op == OP_MATCH)
2022                                 goto nomatch;
2023                         break;
2024                 }
2025                 case TK_M_EVENT_TIMEOUT:
2026                         log_debug("OPTIONS event_timeout=%u", cur->key.event_timeout);
2027                         event->timeout_usec = cur->key.event_timeout * 1000 * 1000;
2028                         break;
2029                 case TK_M_PROGRAM: {
2030                         char program[UTIL_PATH_SIZE];
2031                         char **envp;
2032                         char result[UTIL_PATH_SIZE];
2033
2034                         free(event->program_result);
2035                         event->program_result = NULL;
2036                         udev_event_apply_format(event, rules_str(rules, cur->key.value_off), program, sizeof(program));
2037                         envp = udev_device_get_properties_envp(event->dev);
2038                         log_debug("PROGRAM '%s' %s:%u",
2039                                   program,
2040                                   rules_str(rules, rule->rule.filename_off),
2041                                   rule->rule.filename_line);
2042
2043                         if (udev_event_spawn(event, program, envp, sigmask, result, sizeof(result)) < 0) {
2044                                 if (cur->key.op != OP_NOMATCH)
2045                                         goto nomatch;
2046                         } else {
2047                                 int count;
2048
2049                                 util_remove_trailing_chars(result, '\n');
2050                                 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2051                                         count = util_replace_chars(result, UDEV_ALLOWED_CHARS_INPUT);
2052                                         if (count > 0)
2053                                                 log_debug("%i character(s) replaced" , count);
2054                                 }
2055                                 event->program_result = strdup(result);
2056                                 if (cur->key.op == OP_NOMATCH)
2057                                         goto nomatch;
2058                         }
2059                         break;
2060                 }
2061                 case TK_M_IMPORT_FILE: {
2062                         char import[UTIL_PATH_SIZE];
2063
2064                         udev_event_apply_format(event, rules_str(rules, cur->key.value_off), import, sizeof(import));
2065                         if (import_file_into_properties(event->dev, import) != 0)
2066                                 if (cur->key.op != OP_NOMATCH)
2067                                         goto nomatch;
2068                         break;
2069                 }
2070                 case TK_M_IMPORT_PROG: {
2071                         char import[UTIL_PATH_SIZE];
2072
2073                         udev_event_apply_format(event, rules_str(rules, cur->key.value_off), import, sizeof(import));
2074                         log_debug("IMPORT '%s' %s:%u",
2075                                   import,
2076                                   rules_str(rules, rule->rule.filename_off),
2077                                   rule->rule.filename_line);
2078
2079                         if (import_program_into_properties(event, import, sigmask) != 0)
2080                                 if (cur->key.op != OP_NOMATCH)
2081                                         goto nomatch;
2082                         break;
2083                 }
2084                 case TK_M_IMPORT_BUILTIN: {
2085                         char command[UTIL_PATH_SIZE];
2086
2087                         if (udev_builtin_run_once(cur->key.builtin_cmd)) {
2088                                 /* check if we ran already */
2089                                 if (event->builtin_run & (1 << cur->key.builtin_cmd)) {
2090                                         log_debug("IMPORT builtin skip '%s' %s:%u",
2091                                                   udev_builtin_name(cur->key.builtin_cmd),
2092                                                   rules_str(rules, rule->rule.filename_off),
2093                                                   rule->rule.filename_line);
2094                                         /* return the result from earlier run */
2095                                         if (event->builtin_ret & (1 << cur->key.builtin_cmd))
2096                                         if (cur->key.op != OP_NOMATCH)
2097                                                         goto nomatch;
2098                                         break;
2099                                 }
2100                                 /* mark as ran */
2101                                 event->builtin_run |= (1 << cur->key.builtin_cmd);
2102                         }
2103
2104                         udev_event_apply_format(event, rules_str(rules, cur->key.value_off), command, sizeof(command));
2105                         log_debug("IMPORT builtin '%s' %s:%u",
2106                                   udev_builtin_name(cur->key.builtin_cmd),
2107                                   rules_str(rules, rule->rule.filename_off),
2108                                   rule->rule.filename_line);
2109
2110                         if (udev_builtin_run(event->dev, cur->key.builtin_cmd, command, false) != 0) {
2111                                 /* remember failure */
2112                                 log_debug("IMPORT builtin '%s' returned non-zero",
2113                                           udev_builtin_name(cur->key.builtin_cmd));
2114                                 event->builtin_ret |= (1 << cur->key.builtin_cmd);
2115                                 if (cur->key.op != OP_NOMATCH)
2116                                         goto nomatch;
2117                         }
2118                         break;
2119                 }
2120                 case TK_M_IMPORT_DB: {
2121                         const char *key = rules_str(rules, cur->key.value_off);
2122                         const char *value;
2123
2124                         value = udev_device_get_property_value(event->dev_db, key);
2125                         if (value != NULL) {
2126                                 struct udev_list_entry *entry;
2127
2128                                 entry = udev_device_add_property(event->dev, key, value);
2129                                 udev_list_entry_set_num(entry, true);
2130                         } else {
2131                                 if (cur->key.op != OP_NOMATCH)
2132                                         goto nomatch;
2133                         }
2134                         break;
2135                 }
2136                 case TK_M_IMPORT_CMDLINE: {
2137                         FILE *f;
2138                         bool imported = false;
2139
2140                         f = fopen("/proc/cmdline", "re");
2141                         if (f != NULL) {
2142                                 char cmdline[4096];
2143
2144                                 if (fgets(cmdline, sizeof(cmdline), f) != NULL) {
2145                                         const char *key = rules_str(rules, cur->key.value_off);
2146                                         char *pos;
2147
2148                                         pos = strstr(cmdline, key);
2149                                         if (pos != NULL) {
2150                                                 struct udev_list_entry *entry;
2151
2152                                                 pos += strlen(key);
2153                                                 if (pos[0] == '\0' || isspace(pos[0])) {
2154                                                         /* we import simple flags as 'FLAG=1' */
2155                                                         entry = udev_device_add_property(event->dev, key, "1");
2156                                                         udev_list_entry_set_num(entry, true);
2157                                                         imported = true;
2158                                                 } else if (pos[0] == '=') {
2159                                                         const char *value;
2160
2161                                                         pos++;
2162                                                         value = pos;
2163                                                         while (pos[0] != '\0' && !isspace(pos[0]))
2164                                                                 pos++;
2165                                                         pos[0] = '\0';
2166                                                         entry = udev_device_add_property(event->dev, key, value);
2167                                                         udev_list_entry_set_num(entry, true);
2168                                                         imported = true;
2169                                                 }
2170                                         }
2171                                 }
2172                                 fclose(f);
2173                         }
2174                         if (!imported && cur->key.op != OP_NOMATCH)
2175                                 goto nomatch;
2176                         break;
2177                 }
2178                 case TK_M_IMPORT_PARENT: {
2179                         char import[UTIL_PATH_SIZE];
2180
2181                         udev_event_apply_format(event, rules_str(rules, cur->key.value_off), import, sizeof(import));
2182                         if (import_parent_into_properties(event->dev, import) != 0)
2183                                 if (cur->key.op != OP_NOMATCH)
2184                                         goto nomatch;
2185                         break;
2186                 }
2187                 case TK_M_RESULT:
2188                         if (match_key(rules, cur, event->program_result) != 0)
2189                                 goto nomatch;
2190                         break;
2191                 case TK_A_STRING_ESCAPE_NONE:
2192                         esc = ESCAPE_NONE;
2193                         break;
2194                 case TK_A_STRING_ESCAPE_REPLACE:
2195                         esc = ESCAPE_REPLACE;
2196                         break;
2197                 case TK_A_DB_PERSIST:
2198                         udev_device_set_db_persist(event->dev);
2199                         break;
2200                 case TK_A_INOTIFY_WATCH:
2201                         if (event->inotify_watch_final)
2202                                 break;
2203                         if (cur->key.op == OP_ASSIGN_FINAL)
2204                                 event->inotify_watch_final = true;
2205                         event->inotify_watch = cur->key.watch;
2206                         break;
2207                 case TK_A_DEVLINK_PRIO:
2208                         udev_device_set_devlink_priority(event->dev, cur->key.devlink_prio);
2209                         break;
2210                 case TK_A_OWNER: {
2211                         char owner[UTIL_NAME_SIZE];
2212
2213                         if (event->owner_final)
2214                                 break;
2215                         if (cur->key.op == OP_ASSIGN_FINAL)
2216                                 event->owner_final = true;
2217                         udev_event_apply_format(event, rules_str(rules, cur->key.value_off), owner, sizeof(owner));
2218                         event->owner_set = true;
2219                         event->uid = util_lookup_user(event->udev, owner);
2220                         log_debug("OWNER %u %s:%u",
2221                                   event->uid,
2222                                   rules_str(rules, rule->rule.filename_off),
2223                                   rule->rule.filename_line);
2224                         break;
2225                 }
2226                 case TK_A_GROUP: {
2227                         char group[UTIL_NAME_SIZE];
2228
2229                         if (event->group_final)
2230                                 break;
2231                         if (cur->key.op == OP_ASSIGN_FINAL)
2232                                 event->group_final = true;
2233                         udev_event_apply_format(event, rules_str(rules, cur->key.value_off), group, sizeof(group));
2234                         event->group_set = true;
2235                         event->gid = util_lookup_group(event->udev, group);
2236                         log_debug("GROUP %u %s:%u",
2237                                   event->gid,
2238                                   rules_str(rules, rule->rule.filename_off),
2239                                   rule->rule.filename_line);
2240                         break;
2241                 }
2242                 case TK_A_MODE: {
2243                         char mode_str[UTIL_NAME_SIZE];
2244                         mode_t mode;
2245                         char *endptr;
2246
2247                         if (event->mode_final)
2248                                 break;
2249                         udev_event_apply_format(event, rules_str(rules, cur->key.value_off), mode_str, sizeof(mode_str));
2250                         mode = strtol(mode_str, &endptr, 8);
2251                         if (endptr[0] != '\0') {
2252                                 log_error("ignoring invalid mode '%s'", mode_str);
2253                                 break;
2254                         }
2255                         if (cur->key.op == OP_ASSIGN_FINAL)
2256                                 event->mode_final = true;
2257                         event->mode_set = true;
2258                         event->mode = mode;
2259                         log_debug("MODE %#o %s:%u",
2260                                   event->mode,
2261                                   rules_str(rules, rule->rule.filename_off),
2262                                   rule->rule.filename_line);
2263                         break;
2264                 }
2265                 case TK_A_OWNER_ID:
2266                         if (event->owner_final)
2267                                 break;
2268                         if (cur->key.op == OP_ASSIGN_FINAL)
2269                                 event->owner_final = true;
2270                         event->owner_set = true;
2271                         event->uid = cur->key.uid;
2272                         log_debug("OWNER %u %s:%u",
2273                                   event->uid,
2274                                   rules_str(rules, rule->rule.filename_off),
2275                                   rule->rule.filename_line);
2276                         break;
2277                 case TK_A_GROUP_ID:
2278                         if (event->group_final)
2279                                 break;
2280                         if (cur->key.op == OP_ASSIGN_FINAL)
2281                                 event->group_final = true;
2282                         event->group_set = true;
2283                         event->gid = cur->key.gid;
2284                         log_debug("GROUP %u %s:%u",
2285                                   event->gid,
2286                                   rules_str(rules, rule->rule.filename_off),
2287                                   rule->rule.filename_line);
2288                         break;
2289                 case TK_A_MODE_ID:
2290                         if (event->mode_final)
2291                                 break;
2292                         if (cur->key.op == OP_ASSIGN_FINAL)
2293                                 event->mode_final = true;
2294                         event->mode_set = true;
2295                         event->mode = cur->key.mode;
2296                         log_debug("MODE %#o %s:%u",
2297                                   event->mode,
2298                                   rules_str(rules, rule->rule.filename_off),
2299                                   rule->rule.filename_line);
2300                         break;
2301                 case TK_A_SECLABEL: {
2302                         const char *name, *label;
2303
2304                         name = rules_str(rules, cur->key.attr_off);
2305                         label = rules_str(rules, cur->key.value_off);
2306                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2307                                 udev_list_cleanup(&event->seclabel_list);
2308                         udev_list_entry_add(&event->seclabel_list, name, label);
2309                         log_debug("SECLABEL{%s}='%s' %s:%u",
2310                                   name, label,
2311                                   rules_str(rules, rule->rule.filename_off),
2312                                   rule->rule.filename_line);
2313                         break;
2314                 }
2315                 case TK_A_ENV: {
2316                         const char *name = rules_str(rules, cur->key.attr_off);
2317                         char *value = rules_str(rules, cur->key.value_off);
2318                         char value_new[UTIL_NAME_SIZE];
2319                         const char *value_old = NULL;
2320                         struct udev_list_entry *entry;
2321
2322                         if (value[0] == '\0') {
2323                                 if (cur->key.op == OP_ADD)
2324                                         break;
2325                                 udev_device_add_property(event->dev, name, NULL);
2326                                 break;
2327                         }
2328
2329                         if (cur->key.op == OP_ADD)
2330                                 value_old = udev_device_get_property_value(event->dev, name);
2331                         if (value_old) {
2332                                 char temp[UTIL_NAME_SIZE];
2333
2334                                 /* append value separated by space */
2335                                 udev_event_apply_format(event, value, temp, sizeof(temp));
2336                                 strscpyl(value_new, sizeof(value_new), value_old, " ", temp, NULL);
2337                         } else
2338                                 udev_event_apply_format(event, value, value_new, sizeof(value_new));
2339
2340                         entry = udev_device_add_property(event->dev, name, value_new);
2341                         /* store in db, skip private keys */
2342                         if (name[0] != '.')
2343                                 udev_list_entry_set_num(entry, true);
2344                         break;
2345                 }
2346                 case TK_A_TAG: {
2347                         char tag[UTIL_PATH_SIZE];
2348                         const char *p;
2349
2350                         udev_event_apply_format(event, rules_str(rules, cur->key.value_off), tag, sizeof(tag));
2351                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2352                                 udev_device_cleanup_tags_list(event->dev);
2353                         for (p = tag; *p != '\0'; p++) {
2354                                 if ((*p >= 'a' && *p <= 'z') ||
2355                                     (*p >= 'A' && *p <= 'Z') ||
2356                                     (*p >= '0' && *p <= '9') ||
2357                                     *p == '-' || *p == '_')
2358                                         continue;
2359                                 log_error("ignoring invalid tag name '%s'", tag);
2360                                 break;
2361                         }
2362                         udev_device_add_tag(event->dev, tag);
2363                         break;
2364                 }
2365                 case TK_A_NAME: {
2366                         const char *name  = rules_str(rules, cur->key.value_off);
2367
2368                         char name_str[UTIL_PATH_SIZE];
2369                         int count;
2370
2371                         if (event->name_final)
2372                                 break;
2373                         if (cur->key.op == OP_ASSIGN_FINAL)
2374                                 event->name_final = true;
2375                         udev_event_apply_format(event, name, name_str, sizeof(name_str));
2376                         if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2377                                 count = util_replace_chars(name_str, "/");
2378                                 if (count > 0)
2379                                         log_debug("%i character(s) replaced", count);
2380                         }
2381                         if (major(udev_device_get_devnum(event->dev)) &&
2382                             (!streq(name_str, udev_device_get_devnode(event->dev) + strlen("/dev/")))) {
2383                                 log_error("NAME=\"%s\" ignored, kernel device nodes "
2384                                     "can not be renamed; please fix it in %s:%u\n", name,
2385                                     rules_str(rules, rule->rule.filename_off), rule->rule.filename_line);
2386                                 break;
2387                         }
2388                         free(event->name);
2389                         event->name = strdup(name_str);
2390                         log_debug("NAME '%s' %s:%u",
2391                                   event->name,
2392                                   rules_str(rules, rule->rule.filename_off),
2393                                   rule->rule.filename_line);
2394                         break;
2395                 }
2396                 case TK_A_DEVLINK: {
2397                         char temp[UTIL_PATH_SIZE];
2398                         char filename[UTIL_PATH_SIZE];
2399                         char *pos, *next;
2400                         int count = 0;
2401
2402                         if (event->devlink_final)
2403                                 break;
2404                         if (major(udev_device_get_devnum(event->dev)) == 0)
2405                                 break;
2406                         if (cur->key.op == OP_ASSIGN_FINAL)
2407                                 event->devlink_final = true;
2408                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2409                                 udev_device_cleanup_devlinks_list(event->dev);
2410
2411                         /* allow  multiple symlinks separated by spaces */
2412                         udev_event_apply_format(event, rules_str(rules, cur->key.value_off), temp, sizeof(temp));
2413                         if (esc == ESCAPE_UNSET)
2414                                 count = util_replace_chars(temp, "/ ");
2415                         else if (esc == ESCAPE_REPLACE)
2416                                 count = util_replace_chars(temp, "/");
2417                         if (count > 0)
2418                                 log_debug("%i character(s) replaced" , count);
2419                         pos = temp;
2420                         while (isspace(pos[0]))
2421                                 pos++;
2422                         next = strchr(pos, ' ');
2423                         while (next != NULL) {
2424                                 next[0] = '\0';
2425                                 log_debug("LINK '%s' %s:%u", pos,
2426                                           rules_str(rules, rule->rule.filename_off), rule->rule.filename_line);
2427                                 strscpyl(filename, sizeof(filename), "/dev/", pos, NULL);
2428                                 udev_device_add_devlink(event->dev, filename);
2429                                 while (isspace(next[1]))
2430                                         next++;
2431                                 pos = &next[1];
2432                                 next = strchr(pos, ' ');
2433                         }
2434                         if (pos[0] != '\0') {
2435                                 log_debug("LINK '%s' %s:%u", pos,
2436                                           rules_str(rules, rule->rule.filename_off), rule->rule.filename_line);
2437                                 strscpyl(filename, sizeof(filename), "/dev/", pos, NULL);
2438                                 udev_device_add_devlink(event->dev, filename);
2439                         }
2440                         break;
2441                 }
2442                 case TK_A_ATTR: {
2443                         const char *key_name = rules_str(rules, cur->key.attr_off);
2444                         char attr[UTIL_PATH_SIZE];
2445                         char value[UTIL_NAME_SIZE];
2446                         FILE *f;
2447
2448                         if (util_resolve_subsys_kernel(event->udev, key_name, attr, sizeof(attr), 0) != 0)
2449                                 strscpyl(attr, sizeof(attr), udev_device_get_syspath(event->dev), "/", key_name, NULL);
2450                         attr_subst_subdir(attr, sizeof(attr));
2451
2452                         udev_event_apply_format(event, rules_str(rules, cur->key.value_off), value, sizeof(value));
2453                         log_debug("ATTR '%s' writing '%s' %s:%u", attr, value,
2454                                   rules_str(rules, rule->rule.filename_off),
2455                                   rule->rule.filename_line);
2456                         f = fopen(attr, "we");
2457                         if (f != NULL) {
2458                                 if (fprintf(f, "%s", value) <= 0)
2459                                         log_error("error writing ATTR{%s}: %m", attr);
2460                                 fclose(f);
2461                         } else {
2462                                 log_error("error opening ATTR{%s} for writing: %m", attr);
2463                         }
2464                         break;
2465                 }
2466                 case TK_A_RUN_BUILTIN:
2467                 case TK_A_RUN_PROGRAM: {
2468                         struct udev_list_entry *entry;
2469
2470                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2471                                 udev_list_cleanup(&event->run_list);
2472                         log_debug("RUN '%s' %s:%u",
2473                                   rules_str(rules, cur->key.value_off),
2474                                   rules_str(rules, rule->rule.filename_off),
2475                                   rule->rule.filename_line);
2476                         entry = udev_list_entry_add(&event->run_list, rules_str(rules, cur->key.value_off), NULL);
2477                         udev_list_entry_set_num(entry, cur->key.builtin_cmd);
2478                         break;
2479                 }
2480                 case TK_A_GOTO:
2481                         if (cur->key.rule_goto == 0)
2482                                 break;
2483                         cur = &rules->tokens[cur->key.rule_goto];
2484                         continue;
2485                 case TK_END:
2486                         return 0;
2487
2488                 case TK_M_PARENTS_MIN:
2489                 case TK_M_PARENTS_MAX:
2490                 case TK_M_MAX:
2491                 case TK_UNSET:
2492                         log_error("wrong type %u", cur->type);
2493                         goto nomatch;
2494                 }
2495
2496                 cur++;
2497                 continue;
2498         nomatch:
2499                 /* fast-forward to next rule */
2500                 cur = rule + rule->rule.token_count;
2501         }
2502 }
2503
2504 int udev_rules_apply_static_dev_perms(struct udev_rules *rules)
2505 {
2506         struct token *cur;
2507         struct token *rule;
2508         uid_t uid = 0;
2509         gid_t gid = 0;
2510         mode_t mode = 0;
2511         _cleanup_strv_free_ char **tags = NULL;
2512         char **t;
2513         FILE *f = NULL;
2514         _cleanup_free_ char *path = NULL;
2515         int r = 0;
2516
2517         if (rules->tokens == NULL)
2518                 return 0;
2519
2520         cur = &rules->tokens[0];
2521         rule = cur;
2522         for (;;) {
2523                 switch (cur->type) {
2524                 case TK_RULE:
2525                         /* current rule */
2526                         rule = cur;
2527
2528                         /* skip rules without a static_node tag */
2529                         if (!rule->rule.has_static_node)
2530                                 goto next;
2531
2532                         uid = 0;
2533                         gid = 0;
2534                         mode = 0;
2535                         strv_free(tags);
2536                         tags = NULL;
2537                         break;
2538                 case TK_A_OWNER_ID:
2539                         uid = cur->key.uid;
2540                         break;
2541                 case TK_A_GROUP_ID:
2542                         gid = cur->key.gid;
2543                         break;
2544                 case TK_A_MODE_ID:
2545                         mode = cur->key.mode;
2546                         break;
2547                 case TK_A_TAG:
2548                         r = strv_extend(&tags, rules_str(rules, cur->key.value_off));
2549                         if (r < 0)
2550                                 goto finish;
2551
2552                         break;
2553                 case TK_A_STATIC_NODE: {
2554                         char device_node[UTIL_PATH_SIZE];
2555                         char tags_dir[UTIL_PATH_SIZE];
2556                         char tag_symlink[UTIL_PATH_SIZE];
2557                         struct stat stats;
2558
2559                         /* we assure, that the permissions tokens are sorted before the static token */
2560                         if (mode == 0 && uid == 0 && gid == 0 && tags == NULL)
2561                                 goto next;
2562
2563                         strscpyl(device_node, sizeof(device_node), "/dev/", rules_str(rules, cur->key.value_off), NULL);
2564
2565                         /* export the tags to a directory as symlinks, allowing otherwise dead nodes to be tagged */
2566                         if (tags) {
2567                                 STRV_FOREACH(t, tags) {
2568                                         _cleanup_free_ char *unescaped_filename = NULL;
2569
2570                                         strscpyl(tags_dir, sizeof(tags_dir), "/run/udev/static_node-tags/", *t, "/", NULL);
2571                                         r = mkdir_p(tags_dir, 0755);
2572                                         if (r < 0) {
2573                                                 log_error("failed to create %s: %s", tags_dir, strerror(-r));
2574                                                 return r;
2575                                         }
2576
2577                                         unescaped_filename = xescape(rules_str(rules, cur->key.value_off), "/.");
2578
2579                                         strscpyl(tag_symlink, sizeof(tag_symlink), tags_dir, unescaped_filename, NULL);
2580                                         r = symlink(device_node, tag_symlink);
2581                                         if (r < 0 && errno != EEXIST) {
2582                                                 log_error("failed to create symlink %s -> %s: %m", tag_symlink, device_node);
2583                                                 return -errno;
2584                                         } else
2585                                                 r = 0;
2586                                 }
2587                         }
2588
2589                         /* don't touch the permissions if only the tags were set */
2590                         if (mode == 0 && uid == 0 && gid == 0)
2591                                 break;
2592
2593                         if (stat(device_node, &stats) != 0)
2594                                 break;
2595                         if (!S_ISBLK(stats.st_mode) && !S_ISCHR(stats.st_mode))
2596                                 break;
2597
2598                         if (mode == 0) {
2599                                 if (gid > 0)
2600                                         mode = 0660;
2601                                 else
2602                                         mode = 0600;
2603                         }
2604                         if (mode != (stats.st_mode & 01777)) {
2605                                 r = chmod(device_node, mode);
2606                                 if (r < 0) {
2607                                         log_error("failed to chmod '%s' %#o", device_node, mode);
2608                                         return -errno;
2609                                 } else
2610                                         log_debug("chmod '%s' %#o", device_node, mode);
2611                         }
2612
2613                         if ((uid != 0 && uid != stats.st_uid) || (gid != 0 && gid != stats.st_gid)) {
2614                                 r = chown(device_node, uid, gid);
2615                                 if (r < 0) {
2616                                         log_error("failed to chown '%s' %u %u ", device_node, uid, gid);
2617                                         return -errno;
2618                                 } else
2619                                         log_debug("chown '%s' %u %u", device_node, uid, gid);
2620                         }
2621
2622                         utimensat(AT_FDCWD, device_node, NULL, 0);
2623                         break;
2624                 }
2625                 case TK_END:
2626                         goto finish;
2627                 }
2628
2629                 cur++;
2630                 continue;
2631 next:
2632                 /* fast-forward to next rule */
2633                 cur = rule + rule->rule.token_count;
2634                 continue;
2635         }
2636
2637 finish:
2638         if (f) {
2639                 fflush(f);
2640                 fchmod(fileno(f), 0644);
2641                 if (ferror(f) || rename(path, "/run/udev/static_node-tags") < 0) {
2642                         r = -errno;
2643                         unlink("/run/udev/static_node-tags");
2644                         unlink(path);
2645                 }
2646                 fclose(f);
2647         }
2648
2649         return r;
2650 }