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libudev: hide definition of struct udev_list from other libudev components
[thirdparty/systemd.git] / src / udev / udev-rules.c
CommitLineData
e7145211 1/* SPDX-License-Identifier: GPL-2.0+ */
2232cac8 2
2232cac8 3#include <ctype.h>
2232cac8 4
b5efdb8a 5#include "alloc-util.h"
2c21044f 6#include "conf-files.h"
116b91e8 7#include "def.h"
480ecb7d 8#include "device-util.h"
8fb3f009 9#include "dirent-util.h"
4f5dd394 10#include "escape.h"
3ffd4af2 11#include "fd-util.h"
fae0f8a0 12#include "fileio.h"
4b3b5bc7 13#include "format-util.h"
fdd21be6 14#include "fs-util.h"
7d50b32a 15#include "glob-util.h"
5ea78a39
YW		 16#include "libudev-util.h"
17#include "mkdir.h"
25de7aa7 18#include "nulstr-util.h"
b4ba2fe3 19#include "parse-util.h"
4f5dd394 20#include "path-util.h"
88b013b2 21#include "proc-cmdline.h"
8fcde012 22#include "stat-util.h"
84b6ad70 23#include "strv.h"
5ea78a39 24#include "strxcpyx.h"
f4cf2e5b 25#include "sysctl-util.h"
07a26e42 26#include "udev-builtin.h"
25de7aa7
YW		 27#include "udev-event.h"
28#include "udev-rules.h"
b1d4f8e1 29#include "user-util.h"
2232cac8 30
116b91e8 31#define RULES_DIRS (const char* const*) CONF_PATHS_STRV("udev/rules.d")
c7521974 32
25de7aa7
YW		 33static void udev_rule_token_free(UdevRuleToken *token) {
34 free(token);
915bf0f6
KS		 35}
36
25de7aa7
YW		 37static void udev_rule_line_clear_tokens(UdevRuleLine *rule_line) {
38 UdevRuleToken *i, *next;
912541b0 39
25de7aa7 40 assert(rule_line);
4052400f 41
25de7aa7
YW		 42 LIST_FOREACH_SAFE(tokens, i, next, rule_line->tokens)
43 udev_rule_token_free(i);
912541b0 44
25de7aa7 45 rule_line->tokens = NULL;
5d6a1fa6
KS		 46}
47
25de7aa7
YW		 48static void udev_rule_line_free(UdevRuleLine *rule_line) {
49 if (!rule_line)
50 return;
912541b0 51
25de7aa7 52 udev_rule_line_clear_tokens(rule_line);
c7521974 53
25de7aa7
YW		 54 if (rule_line->rule_file) {
55 if (rule_line->rule_file->current_line == rule_line)
56 rule_line->rule_file->current_line = rule_line->rule_lines_prev;
57
58 LIST_REMOVE(rule_lines, rule_line->rule_file->rule_lines, rule_line);
912541b0 59 }
25de7aa7
YW		 60
61 free(rule_line->line);
62 free(rule_line);
4052400f 63}
154a7b84 64
25de7aa7
YW		 65DEFINE_TRIVIAL_CLEANUP_FUNC(UdevRuleLine*, udev_rule_line_free);
66
67static void udev_rule_file_free(UdevRuleFile *rule_file) {
68 UdevRuleLine *i, *next;
69
70 if (!rule_file)
71 return;
72
73 LIST_FOREACH_SAFE(rule_lines, i, next, rule_file->rule_lines)
74 udev_rule_line_free(i);
912541b0 75
25de7aa7
YW		 76 free(rule_file->filename);
77 free(rule_file);
4052400f 78}
530727ae 79
25de7aa7
YW		 80UdevRules *udev_rules_free(UdevRules *rules) {
81 UdevRuleFile *i, *next;
82
83 if (!rules)
84 return NULL;
85
86 LIST_FOREACH_SAFE(rule_files, i, next, rules->rule_files)
87 udev_rule_file_free(i);
88
89 hashmap_free_free_key(rules->known_users);
90 hashmap_free_free_key(rules->known_groups);
91 return mfree(rules);
c7521974 92}
a27cd06c 93
25de7aa7 94static void log_unknown_owner(sd_device *dev, UdevRules *rules, int error, const char *entity, const char *name) {
2da03cbf 95 if (IN_SET(abs(error), ENOENT, ESRCH))
25de7aa7 96 log_rule_error(dev, rules, "Unknown %s '%s', ignoring", entity, name);
2da03cbf 97 else
25de7aa7 98 log_rule_error_errno(dev, rules, error, "Failed to resolve %s '%s', ignoring: %m", entity, name);
2da03cbf
ZJS		 99}
100
25de7aa7
YW		 101static int rule_resolve_user(UdevRules *rules, const char *name, uid_t *ret) {
102 _cleanup_free_ char *n = NULL;
103 uid_t uid;
104 void *val;
23bf8dd7 105 int r;
912541b0 106
25de7aa7
YW		 107 assert(rules);
108 assert(name);
109
110 val = hashmap_get(rules->known_users, name);
111 if (val) {
112 *ret = PTR_TO_UID(val);
113 return 0;
114 }
115
116 r = get_user_creds(&name, &uid, NULL, NULL, NULL, USER_CREDS_ALLOW_MISSING);
117 if (r < 0) {
118 log_unknown_owner(NULL, rules, r, "user", name);
119 *ret = UID_INVALID;
120 return 0;
912541b0 121 }
912541b0 122
25de7aa7
YW		 123 n = strdup(name);
124 if (!n)
530727ae
YW		 125 return -ENOMEM;
126
25de7aa7
YW		 127 r = hashmap_ensure_allocated(&rules->known_users, &string_hash_ops);
128 if (r < 0)
129 return r;
130
131 r = hashmap_put(rules->known_users, n, UID_TO_PTR(uid));
132 if (r < 0)
133 return r;
134
135 TAKE_PTR(n);
136 *ret = uid;
137 return 0;
154a7b84
KS		 138}
139
25de7aa7
YW		 140static int rule_resolve_group(UdevRules *rules, const char *name, gid_t *ret) {
141 _cleanup_free_ char *n = NULL;
142 gid_t gid;
143 void *val;
23bf8dd7 144 int r;
912541b0 145
25de7aa7
YW		 146 assert(rules);
147 assert(name);
148
149 val = hashmap_get(rules->known_groups, name);
150 if (val) {
151 *ret = PTR_TO_GID(val);
152 return 0;
153 }
154
155 r = get_group_creds(&name, &gid, USER_CREDS_ALLOW_MISSING);
156 if (r < 0) {
157 log_unknown_owner(NULL, rules, r, "group", name);
158 *ret = GID_INVALID;
159 return 0;
912541b0 160 }
912541b0 161
25de7aa7
YW		 162 n = strdup(name);
163 if (!n)
530727ae
YW		 164 return -ENOMEM;
165
25de7aa7
YW		 166 r = hashmap_ensure_allocated(&rules->known_groups, &string_hash_ops);
167 if (r < 0)
168 return r;
169
170 r = hashmap_put(rules->known_groups, n, GID_TO_PTR(gid));
171 if (r < 0)
172 return r;
173
174 TAKE_PTR(n);
175 *ret = gid;
176 return 0;
154a7b84
KS		 177}
178
25de7aa7
YW		 179static UdevRuleSubstituteType rule_get_substitution_type(const char *str) {
180 assert(str);
912541b0 181
25de7aa7
YW		 182 if (str[0] == '[')
183 return SUBST_TYPE_SUBSYS;
184 if (strchr(str, '%') || strchr(str, '$'))
185 return SUBST_TYPE_FORMAT;
186 return SUBST_TYPE_PLAIN;
187}
912541b0 188
25de7aa7
YW		 189static void rule_line_append_token(UdevRuleLine *rule_line, UdevRuleToken *token) {
190 assert(rule_line);
191 assert(token);
912541b0 192
25de7aa7
YW		 193 if (rule_line->current_token)
194 LIST_APPEND(tokens, rule_line->current_token, token);
195 else
196 LIST_APPEND(tokens, rule_line->tokens, token);
912541b0 197
25de7aa7
YW		 198 rule_line->current_token = token;
199}
912541b0 200
25de7aa7
YW		 201static int rule_line_add_token(UdevRuleLine *rule_line, UdevRuleTokenType type, UdevRuleOperatorType op, char *value, void *data) {
202 UdevRuleToken *token;
203 UdevRuleMatchType match_type = _MATCH_TYPE_INVALID;
204 UdevRuleSubstituteType subst_type = _SUBST_TYPE_INVALID;
205 bool remove_trailing_whitespace = false;
206 size_t len;
912541b0 207
25de7aa7
YW		 208 assert(rule_line);
209 assert(type >= 0 && type < _TK_TYPE_MAX);
210 assert(op >= 0 && op < _OP_TYPE_MAX);
211
212 if (type < _TK_M_MAX) {
213 assert(value);
214 assert(IN_SET(op, OP_MATCH, OP_NOMATCH));
215
216 if (type == TK_M_SUBSYSTEM && STR_IN_SET(value, "subsystem", "bus", "class"))
217 match_type = MATCH_TYPE_SUBSYSTEM;
218 else if (isempty(value))
219 match_type = MATCH_TYPE_EMPTY;
220 else if (streq(value, "?*")) {
221 /* Convert KEY=="?*" -> KEY!="" */
222 match_type = MATCH_TYPE_EMPTY;
223 op = op == OP_MATCH ? OP_NOMATCH : OP_MATCH;
224 } else if (string_is_glob(value))
225 match_type = MATCH_TYPE_GLOB;
226 else
227 match_type = MATCH_TYPE_PLAIN;
912541b0 228
25de7aa7
YW		 229 if (type < TK_M_TEST || type == TK_M_RESULT) {
230 /* Convert value string to nulstr. */
231 len = strlen(value);
232 if (len > 1 && (value[len - 1] == '|' || strstr(value, "||"))) {
233 /* In this case, just replacing '|' -> '\0' does not work... */
234 _cleanup_free_ char *tmp = NULL;
235 char *i, *j;
236 bool v = true;
237
238 tmp = strdup(value);
239 if (!tmp)
240 return log_oom();
912541b0 241
25de7aa7
YW		 242 for (i = tmp, j = value; *i != '\0'; i++)
243 if (*i == '|')
244 v = true;
245 else {
246 if (v) {
247 *j++ = '\0';
248 v = false;
249 }
250 *j++ = *i;
251 }
252 j[0] = j[1] = '\0';
253 } else {
254 /* Simple conversion. */
255 char *i;
256
257 for (i = value; *i != '\0'; i++)
258 if (*i == '|')
259 *i = '\0';
260 }
261 }
912541b0
KS		 262 }
263
25de7aa7
YW		 264 if (IN_SET(type, TK_M_ATTR, TK_M_PARENTS_ATTR)) {
265 assert(value);
266 assert(data);
be4bedd1 267
25de7aa7
YW		 268 len = strlen(value);
269 if (len > 0 && !isspace(value[len - 1]))
270 remove_trailing_whitespace = true;
912541b0 271
25de7aa7
YW		 272 subst_type = rule_get_substitution_type((const char*) data);
273 }
fae0f8a0 274
25de7aa7
YW		 275 token = new(UdevRuleToken, 1);
276 if (!token)
277 return -ENOMEM;
fae0f8a0 278
25de7aa7
YW		 279 *token = (UdevRuleToken) {
280 .type = type,
281 .op = op,
282 .value = value,
283 .data = data,
284 .match_type = match_type,
285 .attr_subst_type = subst_type,
286 .attr_match_remove_trailing_whitespace = remove_trailing_whitespace,
287 };
fae0f8a0 288
25de7aa7
YW		 289 rule_line_append_token(rule_line, token);
290
291 if (token->type == TK_A_NAME)
292 SET_FLAG(rule_line->type, LINE_HAS_NAME, true);
293
294 else if (IN_SET(token->type, TK_A_DEVLINK,
295 TK_A_OWNER, TK_A_GROUP, TK_A_MODE,
296 TK_A_OWNER_ID, TK_A_GROUP_ID, TK_A_MODE_ID))
297 SET_FLAG(rule_line->type, LINE_HAS_DEVLINK, true);
298
299 else if (token->type >= _TK_A_MIN ||
300 IN_SET(token->type,
301 TK_M_IMPORT_FILE, TK_M_IMPORT_PROGRAM, TK_M_IMPORT_BUILTIN,
302 TK_M_IMPORT_DB, TK_M_IMPORT_CMDLINE, TK_M_IMPORT_PARENT))
303 SET_FLAG(rule_line->type, LINE_UPDATE_SOMETHING, true);
fae0f8a0 304
912541b0 305 return 0;
bd0ed2ff
KS		 306}
307
25de7aa7
YW		 308static int parse_token(UdevRules *rules, const char *key, char *attr, UdevRuleOperatorType op, char *value) {
309 bool is_match = IN_SET(op, OP_MATCH, OP_NOMATCH);
310 UdevRuleLine *rule_line;
a7521142 311 int r;
912541b0 312
25de7aa7
YW		 313 assert(rules);
314 assert(rules->current_file);
315 assert(rules->current_file->current_line);
316 assert(key);
317 assert(value);
318
319 rule_line = rules->current_file->current_line;
320
321 if (streq(key, "ACTION")) {
322 if (attr)
323 return log_token_invalid_attr(rules, key);
324 if (!is_match)
325 return log_token_invalid_op(rules, key);
326
327 r = rule_line_add_token(rule_line, TK_M_ACTION, op, value, NULL);
328 } else if (streq(key, "DEVPATH")) {
329 if (attr)
330 return log_token_invalid_attr(rules, key);
331 if (!is_match)
332 return log_token_invalid_op(rules, key);
333
334 r = rule_line_add_token(rule_line, TK_M_DEVPATH, op, value, NULL);
335 } else if (streq(key, "KERNEL")) {
336 if (attr)
337 return log_token_invalid_attr(rules, key);
338 if (!is_match)
339 return log_token_invalid_op(rules, key);
340
341 r = rule_line_add_token(rule_line, TK_M_KERNEL, op, value, NULL);
342 } else if (streq(key, "SYMLINK")) {
343 if (attr)
344 return log_token_invalid_attr(rules, key);
345 if (op == OP_REMOVE)
346 return log_token_invalid_op(rules, key);
347
d7aee41d
YW		 348 if (!is_match) {
349 if (udev_check_format(value) < 0)
350 log_token_invalid_value(rules, key, value);
351
352 r = rule_line_add_token(rule_line, TK_A_DEVLINK, op, value, NULL);
353 } else
354 r = rule_line_add_token(rule_line, TK_M_DEVLINK, op, value, NULL);
25de7aa7
YW		 355 } else if (streq(key, "NAME")) {
356 if (attr)
357 return log_token_invalid_attr(rules, key);
358 if (op == OP_REMOVE)
359 return log_token_invalid_op(rules, key);
360 if (op == OP_ADD) {
361 log_token_warning(rules, "%s key takes '==', '!=', '=', or ':=' operator, assuming '=', but please fix it.", key);
362 op = OP_ASSIGN;
363 }
364
365 if (!is_match) {
366 if (streq(value, "%k"))
367 return log_token_error_errno(rules, SYNTHETIC_ERRNO(EINVAL),
368 "Ignoring NAME=\"%%k\" is ignored, as it breaks kernel supplied names.");
369 if (isempty(value))
370 return log_token_error_errno(rules, SYNTHETIC_ERRNO(EINVAL),
371 "Ignoring NAME=\"\", as udev will not delete any device nodes.");
d7aee41d
YW		 372 if (udev_check_format(value) < 0)
373 log_token_invalid_value(rules, key, value);
374
25de7aa7
YW		 375 r = rule_line_add_token(rule_line, TK_A_NAME, op, value, NULL);
376 } else
377 r = rule_line_add_token(rule_line, TK_M_NAME, op, value, NULL);
378 } else if (streq(key, "ENV")) {
379 if (isempty(attr))
380 return log_token_invalid_attr(rules, key);
381 if (op == OP_REMOVE)
382 return log_token_invalid_op(rules, key);
383 if (op == OP_ASSIGN_FINAL) {
384 log_token_warning(rules, "%s key takes '==', '!=', '=', or '+=' operator, assuming '=', but please fix it.", key);
385 op = OP_ASSIGN;
386 }
912541b0 387
25de7aa7
YW		 388 if (!is_match) {
389 if (STR_IN_SET(attr,
390 "ACTION", "DEVLINKS", "DEVNAME", "DEVPATH", "DEVTYPE", "DRIVER",
391 "IFINDEX", "MAJOR", "MINOR", "SEQNUM", "SUBSYSTEM", "TAGS"))
392 return log_token_error_errno(rules, SYNTHETIC_ERRNO(EINVAL),
393 "Invalid ENV attribute. '%s' cannot be set.", attr);
912541b0 394
d7aee41d
YW		 395 if (udev_check_format(value) < 0)
396 log_token_invalid_value(rules, key, value);
25de7aa7
YW		 397 r = rule_line_add_token(rule_line, TK_A_ENV, op, value, attr);
398 } else
399 r = rule_line_add_token(rule_line, TK_M_ENV, op, value, attr);
400 } else if (streq(key, "TAG")) {
401 if (attr)
402 return log_token_invalid_attr(rules, key);
403 if (op == OP_ASSIGN_FINAL) {
404 log_token_warning(rules, "%s key takes '==', '!=', '=', or '+=' operator, assuming '=', but please fix it.", key);
405 op = OP_ASSIGN;
912541b0 406 }
319c6700 407
d7aee41d
YW		 408 if (!is_match) {
409 if (isempty(value) || udev_check_format(value) < 0)
410 log_token_invalid_value(rules, key, value);
411 r = rule_line_add_token(rule_line, TK_A_TAG, op, value, NULL);
412 } else
413 r = rule_line_add_token(rule_line, TK_M_TAG, op, value, NULL);
25de7aa7
YW		 414 } else if (streq(key, "SUBSYSTEM")) {
415 if (attr)
416 return log_token_invalid_attr(rules, key);
417 if (!is_match)
418 return log_token_invalid_op(rules, key);
419
420 if (STR_IN_SET(value, "bus", "class"))
421 log_token_warning(rules, "'%s' must be specified as 'subsystem'; please fix it", value);
422
423 r = rule_line_add_token(rule_line, TK_M_SUBSYSTEM, op, value, NULL);
424 } else if (streq(key, "DRIVER")) {
425 if (attr)
426 return log_token_invalid_attr(rules, key);
427 if (!is_match)
428 return log_token_invalid_op(rules, key);
429
430 r = rule_line_add_token(rule_line, TK_M_DRIVER, op, value, NULL);
431 } else if (streq(key, "ATTR")) {
432 if (isempty(attr))
d7aee41d
YW		 433 return log_token_invalid_attr(rules, key);
434 if (udev_check_format(attr) < 0)
435 log_token_invalid_attr_format(rules, key, attr);
25de7aa7
YW		 436 if (op == OP_REMOVE)
437 return log_token_invalid_op(rules, key);
438 if (IN_SET(op, OP_ADD, OP_ASSIGN_FINAL)) {
439 log_token_warning(rules, "%s key takes '==', '!=', or '=' operator, assuming '=', but please fix it.", key);
440 op = OP_ASSIGN;
441 }
912541b0 442
d7aee41d
YW		 443 if (!is_match) {
444 if (udev_check_format(value) < 0)
445 log_token_invalid_value(rules, key, value);
446
447 r = rule_line_add_token(rule_line, TK_A_ATTR, op, value, attr);
448 } else
449 r = rule_line_add_token(rule_line, TK_M_ATTR, op, value, attr);
25de7aa7
YW		 450 } else if (streq(key, "SYSCTL")) {
451 if (isempty(attr))
452 return log_token_invalid_attr(rules, key);
d7aee41d
YW		 453 if (udev_check_format(attr) < 0)
454 log_token_invalid_attr_format(rules, key, attr);
25de7aa7
YW		 455 if (op == OP_REMOVE)
456 return log_token_invalid_op(rules, key);
457 if (IN_SET(op, OP_ADD, OP_ASSIGN_FINAL)) {
458 log_token_warning(rules, "%s key takes '==', '!=', or '=' operator, assuming '=', but please fix it.", key);
459 op = OP_ASSIGN;
460 }
3b64e4d4 461
d7aee41d
YW		 462 if (!is_match) {
463 if (udev_check_format(value) < 0)
464 log_token_invalid_value(rules, key, value);
465
466 r = rule_line_add_token(rule_line, TK_A_SYSCTL, op, value, attr);
467 } else
468 r = rule_line_add_token(rule_line, TK_M_SYSCTL, op, value, attr);
25de7aa7
YW		 469 } else if (streq(key, "KERNELS")) {
470 if (attr)
471 return log_token_invalid_attr(rules, key);
472 if (!is_match)
473 return log_token_invalid_op(rules, key);
474
475 r = rule_line_add_token(rule_line, TK_M_PARENTS_KERNEL, op, value, NULL);
476 } else if (streq(key, "SUBSYSTEMS")) {
477 if (attr)
478 return log_token_invalid_attr(rules, key);
479 if (!is_match)
480 return log_token_invalid_op(rules, key);
481
482 r = rule_line_add_token(rule_line, TK_M_PARENTS_SUBSYSTEM, op, value, NULL);
483 } else if (streq(key, "DRIVERS")) {
484 if (attr)
485 return log_token_invalid_attr(rules, key);
486 if (!is_match)
487 return log_token_invalid_op(rules, key);
488
489 r = rule_line_add_token(rule_line, TK_M_PARENTS_DRIVER, op, value, NULL);
490 } else if (streq(key, "ATTRS")) {
491 if (isempty(attr))
492 return log_token_invalid_attr(rules, key);
d7aee41d
YW		 493 if (udev_check_format(attr) < 0)
494 log_token_invalid_attr_format(rules, key, attr);
25de7aa7
YW		 495 if (!is_match)
496 return log_token_invalid_op(rules, key);
497
498 if (startswith(attr, "device/"))
499 log_token_warning(rules, "'device' link may not be available in future kernels; please fix it.");
500 if (strstr(attr, "../"))
501 log_token_warning(rules, "Direct reference to parent sysfs directory, may break in future kernels; please fix it.");
502
503 r = rule_line_add_token(rule_line, TK_M_PARENTS_ATTR, op, value, attr);
504 } else if (streq(key, "TAGS")) {
505 if (attr)
506 return log_token_invalid_attr(rules, key);
507 if (!is_match)
508 return log_token_invalid_op(rules, key);
509
510 r = rule_line_add_token(rule_line, TK_M_PARENTS_TAG, op, value, NULL);
511 } else if (streq(key, "TEST")) {
512 mode_t mode = MODE_INVALID;
513
514 if (!isempty(attr)) {
515 r = parse_mode(attr, &mode);
516 if (r < 0)
517 return log_token_error_errno(rules, r, "Failed to parse mode '%s': %m", attr);
518 }
d7aee41d
YW		 519 if (isempty(value) || udev_check_format(value) < 0)
520 log_token_invalid_value(rules, key, value);
25de7aa7
YW		 521 if (!is_match)
522 return log_token_invalid_op(rules, key);
523
524 r = rule_line_add_token(rule_line, TK_M_TEST, op, value, MODE_TO_PTR(mode));
525 } else if (streq(key, "PROGRAM")) {
526 if (attr)
527 return log_token_invalid_attr(rules, key);
d7aee41d
YW		 528 if (isempty(value) || udev_check_format(value) < 0)
529 log_token_invalid_value(rules, key, value);
25de7aa7
YW		 530 if (op == OP_REMOVE)
531 return log_token_invalid_op(rules, key);
532 if (!is_match) {
533 if (op == OP_ASSIGN)
534 log_token_debug(rules, "Operator '=' is specified to %s key, assuming '=='.", key);
535 else
536 log_token_warning(rules, "%s key takes '==' or '!=' operator, assuming '==', but please fix it.", key);
537 op = OP_MATCH;
538 }
912541b0 539
25de7aa7
YW		 540 r = rule_line_add_token(rule_line, TK_M_PROGRAM, op, value, NULL);
541 } else if (streq(key, "IMPORT")) {
542 if (isempty(attr))
543 return log_token_invalid_attr(rules, key);
d7aee41d
YW		 544 if (isempty(value) || udev_check_format(value) < 0)
545 log_token_invalid_value(rules, key, value);
25de7aa7
YW		 546 if (op == OP_REMOVE)
547 return log_token_invalid_op(rules, key);
548 if (!is_match) {
549 if (op == OP_ASSIGN)
550 log_token_debug(rules, "Operator '=' is specified to %s key, assuming '=='.", key);
551 else
552 log_token_warning(rules, "%s key takes '==' or '!=' operator, assuming '==', but please fix it.", key);
553 op = OP_MATCH;
554 }
e2ecb34f 555
25de7aa7
YW		 556 if (streq(attr, "file"))
557 r = rule_line_add_token(rule_line, TK_M_IMPORT_FILE, op, value, NULL);
558 else if (streq(attr, "program")) {
559 UdevBuiltinCommand cmd;
f4850a1d 560
25de7aa7
YW		 561 cmd = udev_builtin_lookup(value);
562 if (cmd >= 0) {
563 log_token_debug(rules,"Found builtin command '%s' for %s, replacing attribute", value, key);
564 r = rule_line_add_token(rule_line, TK_M_IMPORT_BUILTIN, op, value, UDEV_BUILTIN_CMD_TO_PTR(cmd));
565 } else
566 r = rule_line_add_token(rule_line, TK_M_IMPORT_PROGRAM, op, value, NULL);
567 } else if (streq(attr, "builtin")) {
568 UdevBuiltinCommand cmd;
569
570 cmd = udev_builtin_lookup(value);
571 if (cmd < 0)
572 return log_token_error_errno(rules, SYNTHETIC_ERRNO(EINVAL),
573 "Unknown builtin command: %s", value);
574 r = rule_line_add_token(rule_line, TK_M_IMPORT_BUILTIN, op, value, UDEV_BUILTIN_CMD_TO_PTR(cmd));
575 } else if (streq(attr, "db"))
576 r = rule_line_add_token(rule_line, TK_M_IMPORT_DB, op, value, NULL);
577 else if (streq(attr, "cmdline"))
578 r = rule_line_add_token(rule_line, TK_M_IMPORT_CMDLINE, op, value, NULL);
579 else if (streq(attr, "parent"))
580 r = rule_line_add_token(rule_line, TK_M_IMPORT_PARENT, op, value, NULL);
581 else
582 return log_token_invalid_attr(rules, key);
583 } else if (streq(key, "RESULT")) {
584 if (attr)
585 return log_token_invalid_attr(rules, key);
586 if (!is_match)
587 return log_token_invalid_op(rules, key);
588
589 r = rule_line_add_token(rule_line, TK_M_RESULT, op, value, NULL);
590 } else if (streq(key, "OPTIONS")) {
591 char *tmp;
592
593 if (attr)
594 return log_token_invalid_attr(rules, key);
595 if (is_match || op == OP_REMOVE)
596 return log_token_invalid_op(rules, key);
597 if (op == OP_ADD) {
598 log_token_debug(rules, "Operator '+=' is specified to %s key, assuming '='.", key);
599 op = OP_ASSIGN;
600 }
f4850a1d 601
25de7aa7
YW		 602 if (streq(value, "string_escape=none"))
603 r = rule_line_add_token(rule_line, TK_A_OPTIONS_STRING_ESCAPE_NONE, op, NULL, NULL);
604 else if (streq(value, "string_escape=replace"))
605 r = rule_line_add_token(rule_line, TK_A_OPTIONS_STRING_ESCAPE_REPLACE, op, NULL, NULL);
606 else if (streq(value, "db_persist"))
607 r = rule_line_add_token(rule_line, TK_A_OPTIONS_DB_PERSIST, op, NULL, NULL);
608 else if (streq(value, "watch"))
609 r = rule_line_add_token(rule_line, TK_A_OPTIONS_INOTIFY_WATCH, op, NULL, INT_TO_PTR(1));
610 else if (streq(value, "nowatch"))
611 r = rule_line_add_token(rule_line, TK_A_OPTIONS_INOTIFY_WATCH, op, NULL, INT_TO_PTR(0));
612 else if ((tmp = startswith(value, "static_node=")))
613 r = rule_line_add_token(rule_line, TK_A_OPTIONS_STATIC_NODE, op, tmp, NULL);
614 else if ((tmp = startswith(value, "link_priority="))) {
615 int prio;
616
617 r = safe_atoi(tmp, &prio);
618 if (r < 0)
619 return log_token_error_errno(rules, r, "Failed to parse link priority '%s': %m", tmp);
620 r = rule_line_add_token(rule_line, TK_A_OPTIONS_DEVLINK_PRIORITY, op, NULL, INT_TO_PTR(prio));
621 } else {
622 log_token_warning(rules, "Invalid value for OPTIONS key, ignoring: '%s'", value);
623 return 0;
624 }
625 } else if (streq(key, "OWNER")) {
626 uid_t uid;
f4850a1d 627
25de7aa7
YW		 628 if (attr)
629 return log_token_invalid_attr(rules, key);
630 if (is_match || op == OP_REMOVE)
631 return log_token_invalid_op(rules, key);
632 if (op == OP_ADD) {
633 log_token_warning(rules, "%s key takes '=' or ':=' operator, assuming '=', but please fix it.", key);
634 op = OP_ASSIGN;
635 }
f4850a1d 636
25de7aa7
YW		 637 if (parse_uid(value, &uid) >= 0)
638 r = rule_line_add_token(rule_line, TK_A_OWNER_ID, op, NULL, UID_TO_PTR(uid));
639 else if (rules->resolve_name_timing == RESOLVE_NAME_EARLY &&
640 rule_get_substitution_type(value) == SUBST_TYPE_PLAIN) {
641 r = rule_resolve_user(rules, value, &uid);
642 if (r < 0)
643 return log_token_error_errno(rules, r, "Failed to resolve user name '%s': %m", value);
644
645 r = rule_line_add_token(rule_line, TK_A_OWNER_ID, op, NULL, UID_TO_PTR(uid));
d7aee41d
YW		 646 } else if (rules->resolve_name_timing != RESOLVE_NAME_NEVER) {
647 if (isempty(value) || udev_check_format(value) < 0)
648 log_token_invalid_value(rules, key, value);
25de7aa7 649 r = rule_line_add_token(rule_line, TK_A_OWNER, op, value, NULL);
d7aee41d 650 } else {
25de7aa7
YW		 651 log_token_debug(rules, "Resolving user name is disabled, ignoring %s=%s", key, value);
652 return 0;
653 }
654 } else if (streq(key, "GROUP")) {
655 gid_t gid;
656
657 if (attr)
658 return log_token_invalid_attr(rules, key);
659 if (is_match || op == OP_REMOVE)
660 return log_token_invalid_op(rules, key);
661 if (op == OP_ADD) {
662 log_token_warning(rules, "%s key takes '=' or ':=' operator, assuming '=', but please fix it.", key);
663 op = OP_ASSIGN;
664 }
665
666 if (parse_gid(value, &gid) >= 0)
667 r = rule_line_add_token(rule_line, TK_A_GROUP_ID, op, NULL, GID_TO_PTR(gid));
668 else if (rules->resolve_name_timing == RESOLVE_NAME_EARLY &&
669 rule_get_substitution_type(value) == SUBST_TYPE_PLAIN) {
670 r = rule_resolve_group(rules, value, &gid);
671 if (r < 0)
672 return log_token_error_errno(rules, r, "Failed to resolve group name '%s': %m", value);
673
674 r = rule_line_add_token(rule_line, TK_A_GROUP_ID, op, NULL, GID_TO_PTR(gid));
d7aee41d
YW		 675 } else if (rules->resolve_name_timing != RESOLVE_NAME_NEVER) {
676 if (isempty(value) || udev_check_format(value) < 0)
677 log_token_invalid_value(rules, key, value);
25de7aa7 678 r = rule_line_add_token(rule_line, TK_A_GROUP, op, value, NULL);
d7aee41d 679 } else {
25de7aa7
YW		 680 log_token_debug(rules, "Resolving group name is disabled, ignoring %s=%s", key, value);
681 return 0;
682 }
683 } else if (streq(key, "MODE")) {
684 mode_t mode;
685
686 if (attr)
687 return log_token_invalid_attr(rules, key);
688 if (is_match || op == OP_REMOVE)
689 return log_token_invalid_op(rules, key);
690 if (op == OP_ADD) {
691 log_token_warning(rules, "%s key takes '=' or ':=' operator, assuming '=', but please fix it.", key);
692 op = OP_ASSIGN;
693 }
694
695 if (parse_mode(value, &mode) >= 0)
696 r = rule_line_add_token(rule_line, TK_A_MODE_ID, op, NULL, MODE_TO_PTR(mode));
d7aee41d
YW		 697 else {
698 if (isempty(value) || udev_check_format(value) < 0)
699 log_token_invalid_value(rules, key, value);
25de7aa7 700 r = rule_line_add_token(rule_line, TK_A_MODE, op, value, NULL);
d7aee41d 701 }
25de7aa7
YW		 702 } else if (streq(key, "SECLABEL")) {
703 if (isempty(attr))
704 return log_token_invalid_attr(rules, key);
d7aee41d
YW		 705 if (isempty(value) || udev_check_format(value) < 0)
706 log_token_invalid_value(rules, key, value);
25de7aa7
YW		 707 if (is_match || op == OP_REMOVE)
708 return log_token_invalid_op(rules, key);
709 if (op == OP_ASSIGN_FINAL) {
710 log_token_warning(rules, "%s key takes '=' or '+=' operator, assuming '=', but please fix it.", key);
711 op = OP_ASSIGN;
712 }
713
714 r = rule_line_add_token(rule_line, TK_A_SECLABEL, op, value, NULL);
715 } else if (streq(key, "RUN")) {
716 if (is_match || op == OP_REMOVE)
717 return log_token_invalid_op(rules, key);
d7aee41d
YW		 718 if (isempty(value) || udev_check_format(value) < 0)
719 log_token_invalid_value(rules, key, value);
25de7aa7
YW		 720 if (!attr || streq(attr, "program"))
721 r = rule_line_add_token(rule_line, TK_A_RUN_PROGRAM, op, value, NULL);
722 else if (streq(attr, "builtin")) {
723 UdevBuiltinCommand cmd;
724
725 cmd = udev_builtin_lookup(value);
726 if (cmd < 0)
727 return log_token_error_errno(rules, SYNTHETIC_ERRNO(EINVAL),
728 "Unknown builtin command '%s', ignoring", value);
729 r = rule_line_add_token(rule_line, TK_A_RUN_BUILTIN, op, value, UDEV_BUILTIN_CMD_TO_PTR(cmd));
730 } else
731 return log_token_invalid_attr(rules, key);
732 } else if (streq(key, "GOTO")) {
733 if (attr)
734 return log_token_invalid_attr(rules, key);
735 if (op != OP_ASSIGN)
736 return log_token_invalid_op(rules, key);
737 if (FLAGS_SET(rule_line->type, LINE_HAS_GOTO)) {
738 log_token_warning(rules, "Contains multiple GOTO key, ignoring GOTO=\"%s\".", value);
739 return 0;
912541b0 740 }
25de7aa7
YW		 741
742 rule_line->goto_label = value;
743 SET_FLAG(rule_line->type, LINE_HAS_GOTO, true);
744 return 1;
745 } else if (streq(key, "LABEL")) {
746 if (attr)
747 return log_token_invalid_attr(rules, key);
748 if (op != OP_ASSIGN)
749 return log_token_invalid_op(rules, key);
750
751 rule_line->label = value;
752 SET_FLAG(rule_line->type, LINE_HAS_LABEL, true);
753 return 1;
754 } else
755 return log_token_error_errno(rules, SYNTHETIC_ERRNO(EINVAL), "Invalid key '%s'", key);
756 if (r < 0)
757 return log_oom();
758
759 return 1;
0ea5e96e
KS		 760}
761
25de7aa7
YW		 762static UdevRuleOperatorType parse_operator(const char *op) {
763 assert(op);
764
765 if (startswith(op, "=="))
766 return OP_MATCH;
767 if (startswith(op, "!="))
768 return OP_NOMATCH;
769 if (startswith(op, "+="))
770 return OP_ADD;
771 if (startswith(op, "-="))
772 return OP_REMOVE;
773 if (startswith(op, "="))
774 return OP_ASSIGN;
775 if (startswith(op, ":="))
776 return OP_ASSIGN_FINAL;
777
778 return _OP_TYPE_INVALID;
779}
912541b0 780
25de7aa7
YW		 781static int parse_line(char **line, char **ret_key, char **ret_attr, UdevRuleOperatorType *ret_op, char **ret_value) {
782 char *key_begin, *key_end, *attr, *tmp, *value, *i, *j;
783 UdevRuleOperatorType op;
912541b0 784
25de7aa7
YW		 785 assert(line);
786 assert(*line);
787 assert(ret_key);
788 assert(ret_op);
789 assert(ret_value);
912541b0 790
25de7aa7 791 key_begin = skip_leading_chars(*line, WHITESPACE ",");
912541b0 792
25de7aa7
YW		 793 if (isempty(key_begin))
794 return 0;
795
796 for (key_end = key_begin; ; key_end++) {
797 if (key_end[0] == '\0')
704dbfb2 798 return -EINVAL;
25de7aa7 799 if (strchr(WHITESPACE "={", key_end[0]))
912541b0 800 break;
25de7aa7 801 if (strchr("+-!:", key_end[0]) && key_end[1] == '=')
912541b0 802 break;
25de7aa7
YW		 803 }
804 if (key_end[0] == '{') {
805 attr = key_end + 1;
806 tmp = strchr(attr, '}');
807 if (!tmp)
808 return -EINVAL;
809 *tmp++ = '\0';
810 } else {
811 attr = NULL;
812 tmp = key_end;
912541b0
KS		 813 }
814
25de7aa7
YW		 815 tmp = skip_leading_chars(tmp, NULL);
816 op = parse_operator(tmp);
817 if (op < 0)
704dbfb2 818 return -EINVAL;
912541b0 819
25de7aa7 820 key_end[0] = '\0';
912541b0 821
25de7aa7
YW		 822 tmp += op == OP_ASSIGN ? 1 : 2;
823 value = skip_leading_chars(tmp, NULL);
912541b0 824
25de7aa7
YW		 825 /* value must be double quotated */
826 if (value[0] != '"')
704dbfb2 827 return -EINVAL;
25de7aa7 828 value++;
7e760b79 829
25de7aa7
YW		 830 /* unescape double quotation '\"' -> '"' */
831 for (i = j = value; ; i++, j++) {
832 if (*i == '"')
7e760b79 833 break;
25de7aa7 834 if (*i == '\0')
704dbfb2 835 return -EINVAL;
25de7aa7
YW		 836 if (i[0] == '\\' && i[1] == '"')
837 i++;
838 *j = *i;
839 }
840 j[0] = '\0';
841
842 *line = i+1;
843 *ret_key = key_begin;
844 *ret_attr = attr;
845 *ret_op = op;
846 *ret_value = value;
847 return 1;
848}
7e760b79 849
25de7aa7
YW		 850static void sort_tokens(UdevRuleLine *rule_line) {
851 UdevRuleToken *head_old;
7e760b79 852
25de7aa7 853 assert(rule_line);
912541b0 854
25de7aa7
YW		 855 head_old = TAKE_PTR(rule_line->tokens);
856 rule_line->current_token = NULL;
95776dc6 857
25de7aa7
YW		 858 while (!LIST_IS_EMPTY(head_old)) {
859 UdevRuleToken *t, *min_token = NULL;
860
861 LIST_FOREACH(tokens, t, head_old)
862 if (!min_token || min_token->type > t->type)
863 min_token = t;
864
865 LIST_REMOVE(tokens, head_old, min_token);
866 rule_line_append_token(rule_line, min_token);
912541b0 867 }
6880b25d 868}
95776dc6 869
25de7aa7
YW		 870static int rule_add_line(UdevRules *rules, const char *line_str, unsigned line_nr) {
871 _cleanup_(udev_rule_line_freep) UdevRuleLine *rule_line = NULL;
872 _cleanup_free_ char *line = NULL;
873 UdevRuleFile *rule_file;
874 char *p;
875 int r;
912541b0 876
25de7aa7
YW		 877 assert(rules);
878 assert(rules->current_file);
879 assert(line_str);
6e2efb6c 880
25de7aa7 881 rule_file = rules->current_file;
912541b0 882
25de7aa7
YW		 883 if (isempty(line_str))
884 return 0;
912541b0 885
25de7aa7
YW		 886 line = strdup(line_str);
887 if (!line)
888 return log_oom();
67e4b385 889
25de7aa7
YW		 890 rule_line = new(UdevRuleLine, 1);
891 if (!rule_line)
892 return log_oom();
912541b0 893
25de7aa7
YW		 894 *rule_line = (UdevRuleLine) {
895 .line = TAKE_PTR(line),
896 .line_number = line_nr,
897 .rule_file = rule_file,
898 };
912541b0 899
25de7aa7
YW		 900 if (rule_file->current_line)
901 LIST_APPEND(rule_lines, rule_file->current_line, rule_line);
902 else
903 LIST_APPEND(rule_lines, rule_file->rule_lines, rule_line);
e57e7bc1 904
25de7aa7 905 rule_file->current_line = rule_line;
912541b0 906
25de7aa7
YW		 907 for (p = rule_line->line; !isempty(p); ) {
908 char *key, *attr, *value;
909 UdevRuleOperatorType op;
912541b0 910
25de7aa7
YW		 911 r = parse_line(&p, &key, &attr, &op, &value);
912 if (r < 0)
913 return log_token_error_errno(rules, r, "Invalid key/value pair, ignoring.");
914 if (r == 0)
915 break;
912541b0 916
25de7aa7 917 r = parse_token(rules, key, attr, op, value);
ef660d07
YW		 918 if (r < 0)
919 return r;
25de7aa7 920 }
912541b0 921
25de7aa7
YW		 922 if (rule_line->type == 0) {
923 log_token_warning(rules, "The line takes no effect, ignoring.");
924 return 0;
912541b0 925 }
25de7aa7
YW		 926
927 sort_tokens(rule_line);
928 TAKE_PTR(rule_line);
912541b0 929 return 0;
724257d9
GKH		 930}
931
25de7aa7
YW		 932static void rule_resolve_goto(UdevRuleFile *rule_file) {
933 UdevRuleLine *line, *line_next, *i;
912541b0 934
25de7aa7 935 assert(rule_file);
912541b0 936
25de7aa7
YW		 937 /* link GOTOs to LABEL rules in this file to be able to fast-forward */
938 LIST_FOREACH_SAFE(rule_lines, line, line_next, rule_file->rule_lines) {
939 if (!FLAGS_SET(line->type, LINE_HAS_GOTO))
940 continue;
912541b0 941
25de7aa7
YW		 942 LIST_FOREACH_AFTER(rule_lines, i, line)
943 if (streq_ptr(i->label, line->goto_label)) {
944 line->goto_line = i;
945 break;
912541b0
KS		 946 }
947
25de7aa7
YW		 948 if (!line->goto_line) {
949 log_error("%s:%u: GOTO=\"%s\" has no matching label, ignoring",
950 rule_file->filename, line->line_number, line->goto_label);
912541b0 951
25de7aa7
YW		 952 SET_FLAG(line->type, LINE_HAS_GOTO, false);
953 line->goto_label = NULL;
912541b0 954
25de7aa7
YW		 955 if ((line->type & ~LINE_HAS_LABEL) == 0) {
956 log_notice("%s:%u: The line takes no effect any more, dropping",
957 rule_file->filename, line->line_number);
958 if (line->type == LINE_HAS_LABEL)
959 udev_rule_line_clear_tokens(line);
960 else
961 udev_rule_line_free(line);
912541b0 962 }
25de7aa7 963 }
912541b0 964 }
c7521974
KS		 965}
966
9a07157d 967static int parse_file(UdevRules *rules, const char *filename) {
25de7aa7 968 _cleanup_free_ char *continuation = NULL, *name = NULL;
6c8aaf0c 969 _cleanup_fclose_ FILE *f = NULL;
25de7aa7 970 UdevRuleFile *rule_file;
f10aa08e 971 bool ignore_line = false;
25de7aa7
YW		 972 unsigned line_nr = 0;
973 int r;
912541b0 974
ed88bcfb
ZJS		 975 f = fopen(filename, "re");
976 if (!f) {
977 if (errno == ENOENT)
978 return 0;
fae0f8a0
LP		 979
980 return -errno;
775f8b3c 981 }
912541b0 982
ed88bcfb
ZJS		 983 if (null_or_empty_fd(fileno(f))) {
984 log_debug("Skipping empty file: %s", filename);
985 return 0;
25de7aa7 986 }
912541b0 987
25de7aa7
YW		 988 log_debug("Reading rules file: %s", filename);
989
990 name = strdup(filename);
991 if (!name)
992 return log_oom();
993
994 rule_file = new(UdevRuleFile, 1);
995 if (!rule_file)
996 return log_oom();
997
998 *rule_file = (UdevRuleFile) {
999 .filename = TAKE_PTR(name),
1000 };
1001
1002 if (rules->current_file)
1003 LIST_APPEND(rule_files, rules->current_file, rule_file);
1004 else
1005 LIST_APPEND(rule_files, rules->rule_files, rule_file);
1006
1007 rules->current_file = rule_file;
912541b0 1008
f10aa08e
YW		 1009 for (;;) {
1010 _cleanup_free_ char *buf = NULL;
912541b0 1011 size_t len;
f10aa08e
YW		 1012 char *line;
1013
1014 r = read_line(f, UTIL_LINE_SIZE, &buf);
1015 if (r < 0)
1016 return r;
1017 if (r == 0)
1018 break;
912541b0 1019
912541b0 1020 line_nr++;
25de7aa7 1021 line = skip_leading_chars(buf, NULL);
912541b0 1022
f10aa08e 1023 if (line[0] == '#')
912541b0
KS		 1024 continue;
1025
1026 len = strlen(line);
912541b0 1027
f10aa08e
YW		 1028 if (continuation && !ignore_line) {
1029 if (strlen(continuation) + len >= UTIL_LINE_SIZE)
1030 ignore_line = true;
1031
1032 if (!strextend(&continuation, line, NULL))
1033 return log_oom();
1034
1035 if (!ignore_line) {
1036 line = continuation;
1037 len = strlen(line);
1038 }
912541b0
KS		 1039 }
1040
e8b2737f 1041 if (len > 0 && line[len - 1] == '\\') {
f10aa08e
YW		 1042 if (ignore_line)
1043 continue;
1044
1045 line[len - 1] = '\0';
1046 if (!continuation) {
1047 continuation = strdup(line);
1048 if (!continuation)
1049 return log_oom();
1050 }
1051
912541b0
KS		 1052 continue;
1053 }
f10aa08e
YW		 1054
1055 if (ignore_line)
25de7aa7 1056 log_error("%s:%u: Line is too long, ignored", filename, line_nr);
e8b2737f 1057 else if (len > 0)
25de7aa7 1058 (void) rule_add_line(rules, line, line_nr);
f10aa08e
YW		 1059
1060 continuation = mfree(continuation);
1061 ignore_line = false;
912541b0 1062 }
912541b0 1063
25de7aa7 1064 rule_resolve_goto(rule_file);
912541b0 1065 return 0;
c7521974
KS		 1066}
1067
9a07157d
ZJS		 1068int udev_rules_new(UdevRules **ret_rules, ResolveNameTiming resolve_name_timing) {
1069 _cleanup_(udev_rules_freep) UdevRules *rules = NULL;
1d791281
ZJS		 1070 _cleanup_strv_free_ char **files = NULL;
1071 char **f;
775f8b3c 1072 int r;
912541b0 1073
c4d44cba
YW		 1074 assert(resolve_name_timing >= 0 && resolve_name_timing < _RESOLVE_NAME_TIMING_MAX);
1075
9a07157d 1076 rules = new(UdevRules, 1);
1017d66b 1077 if (!rules)
1d791281 1078 return -ENOMEM;
1017d66b 1079
9a07157d 1080 *rules = (UdevRules) {
c4d44cba 1081 .resolve_name_timing = resolve_name_timing,
1017d66b 1082 };
912541b0 1083
25de7aa7 1084 (void) udev_rules_check_timestamp(rules);
3b8c1cb0 1085
116b91e8 1086 r = conf_files_list_strv(&files, ".rules", NULL, 0, RULES_DIRS);
1d791281
ZJS		 1087 if (r < 0)
1088 return log_error_errno(r, "Failed to enumerate rules files: %m");
912541b0 1089
775f8b3c 1090 STRV_FOREACH(f, files)
25de7aa7 1091 (void) parse_file(rules, *f);
912541b0 1092
1d791281
ZJS		 1093 *ret_rules = TAKE_PTR(rules);
1094 return 0;
c7521974
KS		 1095}
1096
9a07157d 1097bool udev_rules_check_timestamp(UdevRules *rules) {
5c11fbe3
KS		 1098 if (!rules)
1099 return false;
1100
116b91e8 1101 return paths_check_timestamp(RULES_DIRS, &rules->dirs_ts_usec, true);
6ada823a
KS		 1102}
1103
25de7aa7
YW		 1104static bool token_match_string(UdevRuleToken *token, const char *str) {
1105 const char *i, *value;
912541b0
KS		 1106 bool match = false;
1107
25de7aa7
YW		 1108 assert(token);
1109 assert(token->value);
1110 assert(token->type < _TK_M_MAX);
912541b0 1111
25de7aa7
YW		 1112 str = strempty(str);
1113 value = token->value;
1114
1115 switch (token->match_type) {
1116 case MATCH_TYPE_EMPTY:
1117 match = isempty(str);
912541b0 1118 break;
25de7aa7
YW		 1119 case MATCH_TYPE_SUBSYSTEM:
1120 value = "subsystem\0class\0bus\0";
1121 _fallthrough_;
1122 case MATCH_TYPE_PLAIN:
1123 NULSTR_FOREACH(i, value)
1124 if (streq(i, str)) {
1125 match = true;
1126 break;
912541b0 1127 }
25de7aa7
YW		 1128 break;
1129 case MATCH_TYPE_GLOB:
1130 NULSTR_FOREACH(i, value)
1131 if ((fnmatch(i, str, 0) == 0)) {
1132 match = true;
1133 break;
912541b0 1134 }
912541b0 1135 break;
25de7aa7
YW		 1136 default:
1137 assert_not_reached("Invalid match type");
912541b0
KS		 1138 }
1139
25de7aa7 1140 return token->op == (match ? OP_MATCH : OP_NOMATCH);
6880b25d
KS		 1141}
1142
25de7aa7 1143static bool token_match_attr(UdevRuleToken *token, sd_device *dev, UdevEvent *event) {
5ba7e798
YW		 1144 char nbuf[UTIL_NAME_SIZE], vbuf[UTIL_NAME_SIZE];
1145 const char *name, *value;
912541b0 1146
25de7aa7
YW		 1147 assert(token);
1148 assert(dev);
1149 assert(event);
1150
1151 name = (const char*) token->data;
1152
1153 switch (token->attr_subst_type) {
1154 case SUBST_TYPE_FORMAT:
1155 (void) udev_event_apply_format(event, name, nbuf, sizeof(nbuf), false);
912541b0 1156 name = nbuf;
4831981d 1157 _fallthrough_;
25de7aa7 1158 case SUBST_TYPE_PLAIN:
5ba7e798 1159 if (sd_device_get_sysattr_value(dev, name, &value) < 0)
605aa52f 1160 return false;
912541b0 1161 break;
25de7aa7 1162 case SUBST_TYPE_SUBSYS:
76b9bdd9 1163 if (util_resolve_subsys_kernel(name, vbuf, sizeof(vbuf), true) < 0)
605aa52f 1164 return false;
912541b0
KS		 1165 value = vbuf;
1166 break;
1167 default:
25de7aa7 1168 assert_not_reached("Invalid attribute substitution type");
912541b0
KS		 1169 }
1170
1171 /* remove trailing whitespace, if not asked to match for it */
25de7aa7
YW		 1172 if (token->attr_match_remove_trailing_whitespace) {
1173 if (value != vbuf) {
1174 strscpy(vbuf, sizeof(vbuf), value);
1175 value = vbuf;
912541b0 1176 }
25de7aa7
YW		 1177
1178 delete_trailing_chars(vbuf, NULL);
912541b0
KS		 1179 }
1180
25de7aa7 1181 return token_match_string(token, value);
6880b25d
KS		 1182}
1183
25de7aa7
YW		 1184static int get_property_from_string(char *line, char **ret_key, char **ret_value) {
1185 char *key, *val;
1186 size_t len;
6880b25d 1187
25de7aa7
YW		 1188 assert(line);
1189 assert(ret_key);
1190 assert(ret_value);
1191
1192 /* find key */
1193 key = skip_leading_chars(line, NULL);
912541b0 1194
25de7aa7
YW		 1195 /* comment or empty line */
1196 if (IN_SET(key[0], '#', '\0'))
d838e145 1197 return 0;
912541b0 1198
25de7aa7
YW		 1199 /* split key/value */
1200 val = strchr(key, '=');
1201 if (!val)
1202 return -EINVAL;
1203 *val++ = '\0';
cf697ec0 1204
25de7aa7
YW		 1205 key = strstrip(key);
1206 if (isempty(key))
1207 return -EINVAL;
912541b0 1208
25de7aa7
YW		 1209 val = strstrip(val);
1210 if (isempty(val))
1211 return -EINVAL;
912541b0 1212
25de7aa7
YW		 1213 /* unquote */
1214 if (IN_SET(val[0], '"', '\'')) {
1215 len = strlen(val);
1216 if (len == 1 || val[len-1] != val[0])
1217 return -EINVAL;
1218 val[len-1] = '\0';
1219 val++;
1220 }
adeba500 1221
25de7aa7
YW		 1222 *ret_key = key;
1223 *ret_value = val;
1224 return 0;
1225}
f4cf2e5b 1226
25de7aa7
YW		 1227static int import_parent_into_properties(sd_device *dev, const char *filter) {
1228 const char *key, *val;
1229 sd_device *parent;
1230 int r;
f4cf2e5b 1231
25de7aa7
YW		 1232 assert(dev);
1233 assert(filter);
912541b0 1234
25de7aa7
YW		 1235 r = sd_device_get_parent(dev, &parent);
1236 if (r == -ENOENT)
1237 return 0;
1238 if (r < 0)
1239 return r;
1240
1241 FOREACH_DEVICE_PROPERTY(parent, key, val) {
1242 if (fnmatch(filter, key, 0) != 0)
912541b0 1243 continue;
25de7aa7
YW		 1244 r = device_add_property(dev, key, val);
1245 if (r < 0)
1246 return r;
1247 }
912541b0 1248
25de7aa7
YW		 1249 return 1;
1250}
912541b0 1251
25de7aa7
YW		 1252static int attr_subst_subdir(char attr[static UTIL_PATH_SIZE]) {
1253 _cleanup_closedir_ DIR *dir = NULL;
1254 struct dirent *dent;
1255 char buf[UTIL_PATH_SIZE], *p;
1256 const char *tail;
1257 size_t len, size;
912541b0 1258
25de7aa7
YW		 1259 tail = strstr(attr, "/*/");
1260 if (!tail)
1261 return 0;
912541b0 1262
25de7aa7
YW		 1263 len = tail - attr + 1; /* include slash at the end */
1264 tail += 2; /* include slash at the beginning */
88b013b2 1265
25de7aa7
YW		 1266 p = buf;
1267 size = sizeof(buf);
1268 size -= strnpcpy(&p, size, attr, len);
88b013b2 1269
25de7aa7
YW		 1270 dir = opendir(buf);
1271 if (!dir)
1272 return -errno;
912541b0 1273
25de7aa7
YW		 1274 FOREACH_DIRENT_ALL(dent, dir, break) {
1275 if (dent->d_name[0] == '.')
1276 continue;
1277
1278 strscpyl(p, size, dent->d_name, tail, NULL);
1279 if (faccessat(dirfd(dir), p, F_OK, 0) < 0)
1280 continue;
1281
1282 strcpy(attr, buf);
1283 return 0;
1284 }
1285
1286 return -ENOENT;
1287}
1288
1289static int udev_rule_apply_token_to_event(
1290 UdevRules *rules,
1291 sd_device *dev,
1292 UdevEvent *event,
1293 usec_t timeout_usec,
1294 Hashmap *properties_list) {
1295
1296 UdevRuleToken *token;
1297 char buf[UTIL_PATH_SIZE];
1298 const char *val;
1299 size_t count;
1300 bool match;
1301 int r;
1302
1303 assert(rules);
1304 assert(dev);
1305 assert(event);
1306
1307 /* This returns the following values:
1308 * 0 on the current token does not match the event,
1309 * 1 on the current token matches the event, and
1310 * negative errno on some critical errors. */
1311
1312 token = rules->current_file->current_line->current_token;
1313
1314 switch (token->type) {
1315 case TK_M_ACTION: {
1316 DeviceAction a;
1317
1318 r = device_get_action(dev, &a);
1319 if (r < 0)
1320 return log_rule_error_errno(dev, rules, r, "Failed to get uevent action type: %m");
1321
1322 return token_match_string(token, device_action_to_string(a));
1323 }
1324 case TK_M_DEVPATH:
1325 r = sd_device_get_devpath(dev, &val);
1326 if (r < 0)
1327 return log_rule_error_errno(dev, rules, r, "Failed to get devpath: %m");
1328
1329 return token_match_string(token, val);
1330 case TK_M_KERNEL:
1331 case TK_M_PARENTS_KERNEL:
1332 r = sd_device_get_sysname(dev, &val);
1333 if (r < 0)
1334 return log_rule_error_errno(dev, rules, r, "Failed to get sysname: %m");
1335
1336 return token_match_string(token, val);
1337 case TK_M_DEVLINK:
1338 FOREACH_DEVICE_DEVLINK(dev, val)
1339 if (token_match_string(token, strempty(startswith(val, "/dev/"))))
1340 return token->op == OP_MATCH;
1341 return token->op == OP_NOMATCH;
1342 case TK_M_NAME:
1343 return token_match_string(token, event->name);
1344 case TK_M_ENV:
1345 if (sd_device_get_property_value(dev, (const char*) token->data, &val) < 0)
1346 val = hashmap_get(properties_list, token->data);
1347
1348 return token_match_string(token, val);
1349 case TK_M_TAG:
1350 case TK_M_PARENTS_TAG:
1351 FOREACH_DEVICE_TAG(dev, val)
1352 if (token_match_string(token, val))
1353 return token->op == OP_MATCH;
1354 return token->op == OP_NOMATCH;
1355 case TK_M_SUBSYSTEM:
1356 case TK_M_PARENTS_SUBSYSTEM:
1357 r = sd_device_get_subsystem(dev, &val);
1358 if (r == -ENOENT)
1359 val = NULL;
1360 else if (r < 0)
1361 return log_rule_error_errno(dev, rules, r, "Failed to get subsystem: %m");
1362
1363 return token_match_string(token, val);
1364 case TK_M_DRIVER:
1365 case TK_M_PARENTS_DRIVER:
1366 r = sd_device_get_driver(dev, &val);
1367 if (r == -ENOENT)
1368 val = NULL;
1369 else if (r < 0)
1370 return log_rule_error_errno(dev, rules, r, "Failed to get driver: %m");
1371
1372 return token_match_string(token, val);
1373 case TK_M_ATTR:
1374 case TK_M_PARENTS_ATTR:
1375 return token_match_attr(token, dev, event);
1376 case TK_M_SYSCTL: {
1377 _cleanup_free_ char *value = NULL;
1378
1379 (void) udev_event_apply_format(event, (const char*) token->data, buf, sizeof(buf), false);
1380 r = sysctl_read(sysctl_normalize(buf), &value);
1381 if (r < 0 && r != -ENOENT)
1382 return log_rule_error_errno(dev, rules, r, "Failed to read sysctl '%s': %m", buf);
1383
1384 return token_match_string(token, strstrip(value));
1385 }
1386 case TK_M_TEST: {
1387 mode_t mode = PTR_TO_MODE(token->data);
1388 struct stat statbuf;
1389
1390 (void) udev_event_apply_format(event, token->value, buf, sizeof(buf), false);
1391 if (!path_is_absolute(buf) &&
1392 util_resolve_subsys_kernel(buf, buf, sizeof(buf), false) < 0) {
1393 char tmp[UTIL_PATH_SIZE];
1394
1395 r = sd_device_get_syspath(dev, &val);
1396 if (r < 0)
1397 return log_rule_error_errno(dev, rules, r, "Failed to get syspath: %m");
1398
1399 strscpy(tmp, sizeof(tmp), buf);
1400 strscpyl(buf, sizeof(buf), val, "/", tmp, NULL);
1401 }
1402
1403 r = attr_subst_subdir(buf);
1404 if (r == -ENOENT)
1405 return token->op == OP_NOMATCH;
1406 if (r < 0)
1407 return log_rule_error_errno(dev, rules, r, "Failed to test the existence of '%s': %m", buf);
1408
1409 if (stat(buf, &statbuf) < 0)
1410 return token->op == OP_NOMATCH;
1411
1412 if (mode == MODE_INVALID)
1413 return token->op == OP_MATCH;
1414
1415 match = (((statbuf.st_mode ^ mode) & 07777) == 0);
1416 return token->op == (match ? OP_MATCH : OP_NOMATCH);
1417 }
1418 case TK_M_PROGRAM: {
1419 char result[UTIL_LINE_SIZE];
1420
1421 event->program_result = mfree(event->program_result);
1422 (void) udev_event_apply_format(event, token->value, buf, sizeof(buf), false);
1423 log_rule_debug(dev, rules, "Running PROGRAM '%s'", buf);
1424
1425 r = udev_event_spawn(event, timeout_usec, true, buf, result, sizeof(result));
1426 if (r < 0)
1427 return log_rule_error_errno(dev, rules, r, "Failed to execute '%s': %m", buf);
1428 if (r > 0)
1429 return token->op == OP_NOMATCH;
1430
1431 delete_trailing_chars(result, "\n");
1432 count = util_replace_chars(result, UDEV_ALLOWED_CHARS_INPUT);
1433 if (count > 0)
1434 log_rule_debug(dev, rules, "Replaced %zu character(s) from result of '%s'",
1435 count, buf);
1436
1437 event->program_result = strdup(result);
1438 return token->op == OP_MATCH;
1439 }
1440 case TK_M_IMPORT_FILE: {
1441 _cleanup_fclose_ FILE *f = NULL;
1442
1443 (void) udev_event_apply_format(event, token->value, buf, sizeof(buf), false);
1444 log_rule_debug(dev, rules, "Importing properties from '%s'", buf);
1445
1446 f = fopen(buf, "re");
1447 if (!f) {
1448 if (errno != ENOENT)
1449 return log_rule_error_errno(dev, rules, errno,
1450 "Failed to open '%s': %m", buf);
1451 return token->op == OP_NOMATCH;
1452 }
912541b0 1453
25de7aa7
YW		 1454 for (;;) {
1455 _cleanup_free_ char *line = NULL;
1456 char *key, *value;
1457
1458 r = read_line(f, LONG_LINE_MAX, &line);
1459 if (r < 0) {
1460 log_rule_debug_errno(dev, rules, r,
1461 "Failed to read '%s', ignoring: %m", buf);
1462 return token->op == OP_NOMATCH;
1463 }
1464 if (r == 0)
912541b0 1465 break;
25de7aa7
YW		 1466
1467 r = get_property_from_string(line, &key, &value);
23bf8dd7 1468 if (r < 0) {
25de7aa7
YW		 1469 log_rule_debug_errno(dev, rules, r,
1470 "Failed to parse key and value from '%s', ignoring: %m",
1471 line);
1472 continue;
23bf8dd7 1473 }
25de7aa7
YW		 1474
1475 r = device_add_property(dev, key, value);
1476 if (r < 0)
1477 return log_rule_error_errno(dev, rules, r,
1478 "Failed to add property %s=%s: %m",
1479 key, value);
912541b0 1480 }
912541b0 1481
25de7aa7
YW		 1482 return token->op == OP_MATCH;
1483 }
1484 case TK_M_IMPORT_PROGRAM: {
1485 char result[UTIL_LINE_SIZE], *line, *pos;
1486
1487 (void) udev_event_apply_format(event, token->value, buf, sizeof(buf), false);
1488 log_rule_debug(dev, rules, "Importing properties from results of '%s'", buf);
1489
1490 r = udev_event_spawn(event, timeout_usec, true, buf, result, sizeof result);
1491 if (r < 0)
1492 return log_rule_error_errno(dev, rules, r, "Failed to execute '%s': %m", buf);
1493 if (r > 0) {
1494 log_rule_debug(dev, rules, "Command \"%s\" returned %d (error), ignoring", buf, r);
1495 return token->op == OP_NOMATCH;
1496 }
1497
1498 for (line = result; !isempty(line); line = pos) {
1499 char *key, *value;
1500
1501 pos = strchr(line, '\n');
1502 if (pos)
1503 *pos++ = '\0';
1504
1505 r = get_property_from_string(line, &key, &value);
23bf8dd7 1506 if (r < 0) {
25de7aa7
YW		 1507 log_rule_debug_errno(dev, rules, r,
1508 "Failed to parse key and value from '%s', ignoring: %m",
1509 line);
1510 continue;
23bf8dd7 1511 }
25de7aa7
YW		 1512
1513 r = device_add_property(dev, key, value);
1514 if (r < 0)
1515 return log_rule_error_errno(dev, rules, r,
1516 "Failed to add property %s=%s: %m",
1517 key, value);
912541b0 1518 }
912541b0 1519
25de7aa7
YW		 1520 return token->op == OP_MATCH;
1521 }
1522 case TK_M_IMPORT_BUILTIN: {
1523 UdevBuiltinCommand cmd = PTR_TO_UDEV_BUILTIN_CMD(token->data);
1524 unsigned mask = 1U << (int) cmd;
1525
1526 if (udev_builtin_run_once(cmd)) {
1527 /* check if we ran already */
1528 if (event->builtin_run & mask) {
1529 log_rule_debug(dev, rules, "Skipping builtin '%s' in IMPORT key",
1530 udev_builtin_name(cmd));
1531 /* return the result from earlier run */
1532 return token->op == (event->builtin_ret & mask ? OP_NOMATCH : OP_MATCH);
912541b0 1533 }
25de7aa7
YW		 1534 /* mark as ran */
1535 event->builtin_run |= mask;
912541b0 1536 }
25de7aa7
YW		 1537
1538 (void) udev_event_apply_format(event, token->value, buf, sizeof(buf), false);
1539 log_rule_debug(dev, rules, "Importing properties from results of builtin command '%s'", buf);
1540
1541 r = udev_builtin_run(dev, cmd, buf, false);
1542 if (r < 0) {
1543 /* remember failure */
1544 log_rule_debug_errno(dev, rules, r, "Failed to run builtin '%s': %m", buf);
1545 event->builtin_ret |= mask;
1546 }
1547 return token->op == (r >= 0 ? OP_MATCH : OP_NOMATCH);
1548 }
1549 case TK_M_IMPORT_DB: {
1550 if (!event->dev_db_clone)
1551 return token->op == OP_NOMATCH;
1552 r = sd_device_get_property_value(event->dev_db_clone, token->value, &val);
1553 if (r == -ENOENT)
1554 return token->op == OP_NOMATCH;
1555 if (r < 0)
1556 return log_rule_error_errno(dev, rules, r,
1557 "Failed to get property '%s' from database: %m",
1558 token->value);
1559
1560 r = device_add_property(dev, token->value, val);
1561 if (r < 0)
1562 return log_rule_error_errno(dev, rules, r, "Failed to add property '%s=%s': %m",
1563 token->value, val);
1564 return token->op == OP_MATCH;
1565 }
1566 case TK_M_IMPORT_CMDLINE: {
1567 _cleanup_free_ char *value = NULL;
1568
1569 r = proc_cmdline_get_key(token->value, PROC_CMDLINE_VALUE_OPTIONAL, &value);
1570 if (r < 0)
1571 return log_rule_error_errno(dev, rules, r,
1572 "Failed to read '%s' option from /proc/cmdline: %m",
1573 token->value);
1574 if (r == 0)
1575 return token->op == OP_NOMATCH;
1576
1577 r = device_add_property(dev, token->value, value ?: "1");
1578 if (r < 0)
1579 return log_rule_error_errno(dev, rules, r, "Failed to add property '%s=%s': %m",
1580 token->value, value ?: "1");
1581 return token->op == OP_MATCH;
1582 }
1583 case TK_M_IMPORT_PARENT: {
1584 (void) udev_event_apply_format(event, token->value, buf, sizeof(buf), false);
1585 r = import_parent_into_properties(dev, buf);
1586 if (r < 0)
1587 return log_rule_error_errno(dev, rules, r,
1588 "Failed to import properties '%s' from parent: %m",
1589 buf);
1590 return token->op == (r > 0 ? OP_MATCH : OP_NOMATCH);
1591 }
1592 case TK_M_RESULT:
1593 return token_match_string(token, event->program_result);
1594 case TK_A_OPTIONS_STRING_ESCAPE_NONE:
1595 event->esc = ESCAPE_NONE;
1596 break;
1597 case TK_A_OPTIONS_STRING_ESCAPE_REPLACE:
1598 event->esc = ESCAPE_REPLACE;
1599 break;
1600 case TK_A_OPTIONS_DB_PERSIST:
1601 device_set_db_persist(dev);
1602 break;
1603 case TK_A_OPTIONS_INOTIFY_WATCH:
1604 if (event->inotify_watch_final)
912541b0 1605 break;
25de7aa7
YW		 1606 if (token->op == OP_ASSIGN_FINAL)
1607 event->inotify_watch_final = true;
1608
1609 event->inotify_watch = token->data;
1610 break;
1611 case TK_A_OPTIONS_DEVLINK_PRIORITY:
1612 device_set_devlink_priority(dev, PTR_TO_INT(token->data));
1613 break;
1614 case TK_A_OWNER: {
1615 char owner[UTIL_NAME_SIZE];
1616 const char *ow = owner;
1617
1618 if (event->owner_final)
912541b0 1619 break;
25de7aa7
YW		 1620 if (token->op == OP_ASSIGN_FINAL)
1621 event->owner_final = true;
1622
1623 (void) udev_event_apply_format(event, token->value, owner, sizeof(owner), false);
1624 r = get_user_creds(&ow, &event->uid, NULL, NULL, NULL, USER_CREDS_ALLOW_MISSING);
1625 if (r < 0)
1626 log_unknown_owner(dev, rules, r, "user", owner);
1627 else
1628 log_rule_debug(dev, rules, "OWNER %s(%u)", owner, event->uid);
1629 break;
1630 }
1631 case TK_A_GROUP: {
1632 char group[UTIL_NAME_SIZE];
1633 const char *gr = group;
1634
1635 if (event->group_final)
912541b0 1636 break;
25de7aa7
YW		 1637 if (token->op == OP_ASSIGN_FINAL)
1638 event->group_final = true;
c26547d6 1639
25de7aa7
YW		 1640 (void) udev_event_apply_format(event, token->value, group, sizeof(group), false);
1641 r = get_group_creds(&gr, &event->gid, USER_CREDS_ALLOW_MISSING);
1642 if (r < 0)
1643 log_unknown_owner(dev, rules, r, "group", group);
1644 else
1645 log_rule_debug(dev, rules, "GROUP %s(%u)", group, event->gid);
1646 break;
1647 }
1648 case TK_A_MODE: {
1649 char mode_str[UTIL_NAME_SIZE];
d838e145 1650
25de7aa7
YW		 1651 if (event->mode_final)
1652 break;
1653 if (token->op == OP_ASSIGN_FINAL)
1654 event->mode_final = true;
4f985bd8 1655
25de7aa7
YW		 1656 (void) udev_event_apply_format(event, token->value, mode_str, sizeof(mode_str), false);
1657 r = parse_mode(mode_str, &event->mode);
1658 if (r < 0)
1659 log_rule_error_errno(dev, rules, r, "Failed to parse mode '%s', ignoring: %m", mode_str);
1660 else
1661 log_rule_debug(dev, rules, "MODE %#o", event->mode);
1662 break;
1663 }
1664 case TK_A_OWNER_ID:
1665 if (event->owner_final)
1666 break;
1667 if (token->op == OP_ASSIGN_FINAL)
1668 event->owner_final = true;
1669 if (!token->data)
1670 break;
1671 event->uid = PTR_TO_UID(token->data);
1672 log_rule_debug(dev, rules, "OWNER %u", event->uid);
1673 break;
1674 case TK_A_GROUP_ID:
1675 if (event->group_final)
1676 break;
1677 if (token->op == OP_ASSIGN_FINAL)
1678 event->group_final = true;
1679 if (!token->data)
1680 break;
1681 event->gid = PTR_TO_GID(token->data);
1682 log_rule_debug(dev, rules, "GROUP %u", event->gid);
1683 break;
1684 case TK_A_MODE_ID:
1685 if (event->mode_final)
1686 break;
1687 if (token->op == OP_ASSIGN_FINAL)
1688 event->mode_final = true;
1689 if (!token->data)
1690 break;
1691 event->mode = PTR_TO_MODE(token->data);
1692 log_rule_debug(dev, rules, "MODE %#o", event->mode);
1693 break;
1694 case TK_A_SECLABEL: {
1695 _cleanup_free_ char *name = NULL, *label = NULL;
1696 char label_str[UTIL_LINE_SIZE] = {};
d838e145 1697
25de7aa7
YW		 1698 name = strdup((const char*) token->data);
1699 if (!name)
1700 return log_oom();
d838e145 1701
25de7aa7
YW		 1702 (void) udev_event_apply_format(event, token->value, label_str, sizeof(label_str), false);
1703 if (!isempty(label_str))
1704 label = strdup(label_str);
1705 else
1706 label = strdup(token->value);
1707 if (!label)
1708 return log_oom();
a6ca3c19 1709
25de7aa7
YW		 1710 if (token->op == OP_ASSIGN)
1711 ordered_hashmap_clear_free_free(event->seclabel_list);
07845c14 1712
25de7aa7
YW		 1713 r = ordered_hashmap_ensure_allocated(&event->seclabel_list, NULL);
1714 if (r < 0)
1715 return log_oom();
07845c14 1716
25de7aa7
YW		 1717 r = ordered_hashmap_put(event->seclabel_list, name, label);
1718 if (r < 0)
1719 return log_oom();
1720 log_rule_debug(dev, rules, "SECLABEL{%s}='%s'", name, label);
1721 name = label = NULL;
1722 break;
1723 }
1724 case TK_A_ENV: {
1725 const char *name = (const char*) token->data;
1726 char value_new[UTIL_NAME_SIZE], *p = value_new;
1727 size_t l = sizeof(value_new);
07845c14 1728
25de7aa7
YW		 1729 if (isempty(token->value)) {
1730 if (token->op == OP_ADD)
912541b0 1731 break;
25de7aa7
YW		 1732 r = device_add_property(dev, name, NULL);
1733 if (r < 0)
1734 return log_rule_error_errno(dev, rules, r, "Failed to remove property '%s': %m", name);
912541b0
KS		 1735 break;
1736 }
912541b0 1737
25de7aa7
YW		 1738 if (token->op == OP_ADD &&
1739 sd_device_get_property_value(dev, name, &val) >= 0)
1740 l = strpcpyl(&p, l, val, " ", NULL);
1741
1742 (void) udev_event_apply_format(event, token->value, p, l, false);
d838e145 1743
25de7aa7
YW		 1744 r = device_add_property(dev, name, value_new);
1745 if (r < 0)
1746 return log_rule_error_errno(dev, rules, r, "Failed to add property '%s=%s': %m", name, value_new);
1747 break;
1748 }
1749 case TK_A_TAG: {
1750 (void) udev_event_apply_format(event, token->value, buf, sizeof(buf), false);
1751 if (token->op == OP_ASSIGN)
1752 device_cleanup_tags(dev);
1753
1754 if (buf[strspn(buf, ALPHANUMERICAL "-_")] != '\0') {
1755 log_rule_error(dev, rules, "Invalid tag name '%s', ignoring", buf);
912541b0
KS		 1756 break;
1757 }
25de7aa7
YW		 1758 if (token->op == OP_REMOVE)
1759 device_remove_tag(dev, buf);
1760 else {
1761 r = device_add_tag(dev, buf);
1762 if (r < 0)
1763 return log_rule_error_errno(dev, rules, r, "Failed to add tag '%s': %m", buf);
1764 }
1765 break;
1766 }
1767 case TK_A_NAME: {
1768 if (event->name_final)
1769 break;
1770 if (token->op == OP_ASSIGN_FINAL)
1771 event->name_final = true;
912541b0 1772
25de7aa7
YW		 1773 (void) udev_event_apply_format(event, token->value, buf, sizeof(buf), false);
1774 if (IN_SET(event->esc, ESCAPE_UNSET, ESCAPE_REPLACE)) {
1775 count = util_replace_chars(buf, "/");
912541b0 1776 if (count > 0)
25de7aa7
YW		 1777 log_rule_debug(dev, rules, "Replaced %zu character(s) from result of NAME=\"%s\"",
1778 count, token->value);
912541b0 1779 }
25de7aa7
YW		 1780 if (sd_device_get_devnum(dev, NULL) >= 0 &&
1781 (sd_device_get_devname(dev, &val) < 0 ||
1782 !streq_ptr(buf, startswith(val, "/dev/")))) {
1783 log_rule_error(dev, rules,
1784 "Kernel device nodes cannot be renamed, ignoring NAME=\"%s\"; please fix it.",
1785 token->value);
912541b0
KS		 1786 break;
1787 }
25de7aa7
YW		 1788 if (free_and_strdup(&event->name, buf) < 0)
1789 return log_oom();
1790
1791 log_rule_debug(dev, rules, "NAME '%s'", event->name);
1792 break;
1793 }
1794 case TK_A_DEVLINK: {
1795 char *p;
1796
1797 if (event->devlink_final)
1798 break;
1799 if (sd_device_get_devnum(dev, NULL) < 0)
1800 break;
1801 if (token->op == OP_ASSIGN_FINAL)
1802 event->devlink_final = true;
1803 if (IN_SET(token->op, OP_ASSIGN, OP_ASSIGN_FINAL))
1804 device_cleanup_devlinks(dev);
1805
1806 /* allow multiple symlinks separated by spaces */
1807 (void) udev_event_apply_format(event, token->value, buf, sizeof(buf), event->esc != ESCAPE_NONE);
1808 if (event->esc == ESCAPE_UNSET)
1809 count = util_replace_chars(buf, "/ ");
1810 else if (event->esc == ESCAPE_REPLACE)
1811 count = util_replace_chars(buf, "/");
1812 else
1813 count = 0;
1814 if (count > 0)
1815 log_rule_debug(dev, rules, "Replaced %zu character(s) from result of LINK", count);
1816
1817 p = skip_leading_chars(buf, NULL);
1818 while (!isempty(p)) {
1819 char filename[UTIL_PATH_SIZE], *next;
1820
1821 next = strchr(p, ' ');
1822 if (next) {
1823 *next++ = '\0';
1824 next = skip_leading_chars(next, NULL);
1825 }
1826
1827 strscpyl(filename, sizeof(filename), "/dev/", p, NULL);
1828 r = device_add_devlink(dev, filename);
f4cf2e5b 1829 if (r < 0)
25de7aa7
YW		 1830 return log_rule_error_errno(dev, rules, r, "Failed to add devlink '%s': %m", filename);
1831
1832 log_rule_debug(dev, rules, "LINK '%s'", p);
1833 p = next;
1834 }
1835 break;
1836 }
1837 case TK_A_ATTR: {
1838 const char *key_name = (const char*) token->data;
1839 char value[UTIL_NAME_SIZE];
1840
1841 if (util_resolve_subsys_kernel(key_name, buf, sizeof(buf), false) < 0 &&
1842 sd_device_get_syspath(dev, &val) >= 0)
1843 strscpyl(buf, sizeof(buf), val, "/", key_name, NULL);
1844
1845 r = attr_subst_subdir(buf);
1846 if (r < 0) {
1847 log_rule_error_errno(dev, rules, r, "Could not find file matches '%s', ignoring: %m", buf);
f4cf2e5b
KS		 1848 break;
1849 }
25de7aa7 1850 (void) udev_event_apply_format(event, token->value, value, sizeof(value), false);
6cdc62aa 1851
25de7aa7
YW		 1852 log_rule_debug(dev, rules, "ATTR '%s' writing '%s'", buf, value);
1853 r = write_string_file(buf, value, WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
1854 if (r < 0)
1855 log_rule_error_errno(dev, rules, r, "Failed to write ATTR{%s}, ignoring: %m", buf);
1856 break;
1857 }
1858 case TK_A_SYSCTL: {
1859 char value[UTIL_NAME_SIZE];
1860
1861 (void) udev_event_apply_format(event, (const char*) token->data, buf, sizeof(buf), false);
1862 (void) udev_event_apply_format(event, token->value, value, sizeof(value), false);
1863 sysctl_normalize(buf);
1864 log_rule_debug(dev, rules, "SYSCTL '%s' writing '%s'", buf, value);
1865 r = sysctl_write(buf, value);
1866 if (r < 0)
1867 log_rule_error_errno(dev, rules, r, "Failed to write SYSCTL{%s}='%s', ignoring: %m", buf, value);
1868 break;
1869 }
1870 case TK_A_RUN_BUILTIN:
1871 case TK_A_RUN_PROGRAM: {
1872 _cleanup_free_ char *cmd = NULL;
29448498 1873
25de7aa7
YW		 1874 if (event->run_final)
1875 break;
1876 if (token->op == OP_ASSIGN_FINAL)
1877 event->run_final = true;
29448498 1878
25de7aa7
YW		 1879 if (IN_SET(token->op, OP_ASSIGN, OP_ASSIGN_FINAL))
1880 ordered_hashmap_clear_free_key(event->run_list);
29448498 1881
25de7aa7
YW		 1882 r = ordered_hashmap_ensure_allocated(&event->run_list, NULL);
1883 if (r < 0)
1884 return log_oom();
29448498 1885
1448820a
YW		 1886 (void) udev_event_apply_format(event, token->value, buf, sizeof(buf), false);
1887
1888 cmd = strdup(buf);
25de7aa7
YW		 1889 if (!cmd)
1890 return log_oom();
29448498 1891
25de7aa7
YW		 1892 r = ordered_hashmap_put(event->run_list, cmd, token->data);
1893 if (r < 0)
1894 return log_oom();
83cd6b75 1895
25de7aa7
YW		 1896 TAKE_PTR(cmd);
1897
1898 log_rule_debug(dev, rules, "RUN '%s'", token->value);
1899 break;
1900 }
1901 case TK_A_OPTIONS_STATIC_NODE:
1902 /* do nothing for events. */
1903 break;
1904 default:
1905 assert_not_reached("Invalid token type");
1906 }
1907
1908 return true;
1909}
1910
1911static bool token_is_for_parents(UdevRuleToken *token) {
1912 return token->type >= TK_M_PARENTS_KERNEL && token->type <= TK_M_PARENTS_TAG;
1913}
1914
1915static int udev_rule_apply_parent_token_to_event(
1916 UdevRules *rules,
1917 UdevEvent *event) {
1918
1919 UdevRuleLine *line;
1920 UdevRuleToken *head;
1921 int r;
1922
1923 line = rules->current_file->current_line;
1924 head = rules->current_file->current_line->current_token;
1925 event->dev_parent = event->dev;
1926 for (;;) {
1927 LIST_FOREACH(tokens, line->current_token, head) {
1928 if (!token_is_for_parents(line->current_token))
1929 return true; /* All parent tokens match. */
1930 r = udev_rule_apply_token_to_event(rules, event->dev_parent, event, 0, NULL);
1931 if (r < 0)
1932 return r;
1933 if (r == 0)
912541b0 1934 break;
25de7aa7
YW		 1935 }
1936 if (!line->current_token)
1937 /* All parent tokens match. But no assign tokens in the line. Hmm... */
1938 return true;
1939
1940 if (sd_device_get_parent(event->dev_parent, &event->dev_parent) < 0) {
1941 event->dev_parent = NULL;
1942 return false;
1943 }
1944 }
1945}
1946
1947static int udev_rule_apply_line_to_event(
1948 UdevRules *rules,
1949 UdevEvent *event,
1950 usec_t timeout_usec,
1951 Hashmap *properties_list,
1952 UdevRuleLine **next_line) {
1953
1954 UdevRuleLine *line = rules->current_file->current_line;
1955 UdevRuleLineType mask = LINE_HAS_GOTO | LINE_UPDATE_SOMETHING;
1956 UdevRuleToken *token, *next_token;
1957 bool parents_done = false;
1958 DeviceAction action;
1959 int r;
912541b0 1960
25de7aa7
YW		 1961 r = device_get_action(event->dev, &action);
1962 if (r < 0)
1963 return r;
1964
1965 if (action != DEVICE_ACTION_REMOVE) {
1966 if (sd_device_get_devnum(event->dev, NULL) >= 0)
1967 mask |= LINE_HAS_DEVLINK;
1968
1969 if (sd_device_get_ifindex(event->dev, NULL) >= 0)
1970 mask |= LINE_HAS_NAME;
1971 }
1972
1973 if ((line->type & mask) == 0)
1974 return 0;
1975
1976 event->esc = ESCAPE_UNSET;
1977 LIST_FOREACH_SAFE(tokens, token, next_token, line->tokens) {
1978 line->current_token = token;
1979
1980 if (token_is_for_parents(token)) {
1981 if (parents_done)
1982 continue;
1983
1984 r = udev_rule_apply_parent_token_to_event(rules, event);
1985 if (r <= 0)
1986 return r;
1987
1988 parents_done = true;
1989 continue;
912541b0
KS		 1990 }
1991
25de7aa7
YW		 1992 r = udev_rule_apply_token_to_event(rules, event->dev, event, timeout_usec, properties_list);
1993 if (r <= 0)
1994 return r;
912541b0 1995 }
d838e145 1996
25de7aa7
YW		 1997 if (line->goto_line)
1998 *next_line = line->goto_line;
1999
d838e145 2000 return 0;
6880b25d 2001}
761dfddc 2002
25de7aa7
YW		 2003int udev_rules_apply_to_event(
2004 UdevRules *rules,
2005 UdevEvent *event,
2006 usec_t timeout_usec,
2007 Hashmap *properties_list) {
2008
2009 UdevRuleFile *file;
2010 UdevRuleLine *next_line;
2011 int r;
2012
2013 assert(rules);
2014 assert(event);
2015
2016 LIST_FOREACH(rule_files, file, rules->rule_files) {
2017 rules->current_file = file;
2018 LIST_FOREACH_SAFE(rule_lines, file->current_line, next_line, file->rule_lines) {
2019 r = udev_rule_apply_line_to_event(rules, event, timeout_usec, properties_list, &next_line);
2020 if (r < 0)
2021 return r;
2022 }
2023 }
2024
2025 return 0;
2026}
2027
2028static int apply_static_dev_perms(const char *devnode, uid_t uid, gid_t gid, mode_t mode, char **tags) {
2029 char device_node[UTIL_PATH_SIZE], tags_dir[UTIL_PATH_SIZE], tag_symlink[UTIL_PATH_SIZE];
2030 _cleanup_free_ char *unescaped_filename = NULL;
2031 struct stat stats;
84b6ad70 2032 char **t;
fdd21be6 2033 int r;
912541b0 2034
25de7aa7
YW		 2035 assert(devnode);
2036
2037 if (uid == UID_INVALID && gid == GID_INVALID && mode == MODE_INVALID && !tags)
84b6ad70 2038 return 0;
912541b0 2039
25de7aa7
YW		 2040 strscpyl(device_node, sizeof(device_node), "/dev/", devnode, NULL);
2041 if (stat(device_node, &stats) < 0) {
2042 if (errno != ENOENT)
2043 return log_error_errno(errno, "Failed to stat %s: %m", device_node);
2044 return 0;
2045 }
84b6ad70 2046
25de7aa7
YW		 2047 if (!S_ISBLK(stats.st_mode) && !S_ISCHR(stats.st_mode)) {
2048 log_warning("%s is neither block nor character device, ignoring.", device_node);
2049 return 0;
2050 }
912541b0 2051
25de7aa7
YW		 2052 if (!strv_isempty(tags)) {
2053 unescaped_filename = xescape(devnode, "/.");
2054 if (!unescaped_filename)
2055 return log_oom();
2056 }
ca2bb160 2057
25de7aa7
YW		 2058 /* export the tags to a directory as symlinks, allowing otherwise dead nodes to be tagged */
2059 STRV_FOREACH(t, tags) {
2060 strscpyl(tags_dir, sizeof(tags_dir), "/run/udev/static_node-tags/", *t, "/", NULL);
2061 r = mkdir_p(tags_dir, 0755);
2062 if (r < 0)
2063 return log_error_errno(r, "Failed to create %s: %m", tags_dir);
d6f116a7 2064
25de7aa7
YW		 2065 strscpyl(tag_symlink, sizeof(tag_symlink), tags_dir, unescaped_filename, NULL);
2066 r = symlink(device_node, tag_symlink);
2067 if (r < 0 && errno != EEXIST)
2068 return log_error_errno(errno, "Failed to create symlink %s -> %s: %m",
2069 tag_symlink, device_node);
2070 }
84b6ad70 2071
25de7aa7
YW		 2072 /* don't touch the permissions if only the tags were set */
2073 if (uid == UID_INVALID && gid == GID_INVALID && mode == MODE_INVALID)
2074 return 0;
84b6ad70 2075
25de7aa7
YW		 2076 if (mode == MODE_INVALID)
2077 mode = gid_is_valid(gid) ? 0660 : 0600;
2078 if (!uid_is_valid(uid))
2079 uid = 0;
2080 if (!gid_is_valid(gid))
2081 gid = 0;
84b6ad70 2082
25de7aa7
YW		 2083 r = chmod_and_chown(device_node, mode, uid, gid);
2084 if (r < 0)
2085 return log_error_errno(errno, "Failed to chown '%s' %u %u: %m",
2086 device_node, uid, gid);
2087 else
2088 log_debug("chown '%s' %u:%u", device_node, uid, gid);
84b6ad70 2089
25de7aa7
YW		 2090 (void) utimensat(AT_FDCWD, device_node, NULL, 0);
2091 return 0;
2092}
84b6ad70 2093
25de7aa7
YW		 2094static int udev_rule_line_apply_static_dev_perms(UdevRuleLine *rule_line) {
2095 UdevRuleToken *token;
2096 _cleanup_free_ char **tags = NULL;
2097 uid_t uid = UID_INVALID;
2098 gid_t gid = GID_INVALID;
2099 mode_t mode = MODE_INVALID;
2100 int r;
d6f116a7 2101
25de7aa7 2102 assert(rule_line);
912541b0 2103
25de7aa7
YW		 2104 if (!FLAGS_SET(rule_line->type, LINE_HAS_STATIC_NODE))
2105 return 0;
912541b0 2106
25de7aa7
YW		 2107 LIST_FOREACH(tokens, token, rule_line->tokens)
2108 if (token->type == TK_A_OWNER_ID)
2109 uid = PTR_TO_UID(token->data);
2110 else if (token->type == TK_A_GROUP_ID)
2111 gid = PTR_TO_GID(token->data);
2112 else if (token->type == TK_A_MODE_ID)
2113 mode = PTR_TO_MODE(token->data);
2114 else if (token->type == TK_A_TAG) {
2115 r = strv_extend(&tags, token->value);
2116 if (r < 0)
2117 return log_oom();
2118 } else if (token->type == TK_A_OPTIONS_STATIC_NODE) {
2119 r = apply_static_dev_perms(token->value, uid, gid, mode, tags);
2120 if (r < 0)
2121 return r;
912541b0
KS		 2122 }
2123
25de7aa7
YW		 2124 return 0;
2125}
2126
2127int udev_rules_apply_static_dev_perms(UdevRules *rules) {
2128 UdevRuleFile *file;
2129 UdevRuleLine *line;
2130 int r;
2131
2132 assert(rules);
84b6ad70 2133
25de7aa7
YW		 2134 LIST_FOREACH(rule_files, file, rules->rule_files)
2135 LIST_FOREACH(rule_lines, line, file->rule_lines) {
2136 r = udev_rule_line_apply_static_dev_perms(line);
2137 if (r < 0)
2138 return r;
84b6ad70 2139 }
84b6ad70 2140
fdd21be6 2141 return 0;
761dfddc 2142}
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