2 * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
3 * Copyright (C) 2003-2008 Kay Sievers <kay.sievers@vrfy.org>
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
30 #include <sys/socket.h>
36 #include "udev_rules.h"
38 extern char **environ;
40 /* extract possible {attr} and move str behind it */
41 static char *get_format_attribute(struct udev *udev, char **str)
47 pos = strchr(*str, '}');
49 err(udev, "missing closing brace for format\n");
55 dbg(udev, "attribute='%s', str='%s'\n", attr, *str);
60 /* extract possible format length and move str behind it*/
61 static int get_format_len(struct udev *udev, char **str)
66 if (isdigit(*str[0])) {
67 num = (int) strtoul(*str, &tail, 10);
70 dbg(udev, "format length=%i\n", num);
73 err(udev, "format parsing error '%s'\n", *str);
79 static int get_key(char **line, char **key, char **value)
89 while (isspace(linepos[0]))
93 temp = strchr(linepos, '=');
94 if (temp == NULL || temp == linepos)
100 /* get a quoted value */
101 if (linepos[0] == '"' || linepos[0] == '\'') {
102 temp = strchr(&linepos[1], linepos[0]);
105 *value = &linepos[1];
111 temp = strchr(linepos, '\n');
119 static int run_program(struct udev_device *dev, const char *command,
120 char *result, size_t ressize, size_t *reslen)
122 struct udev *udev = udev_device_get_udev(dev);
125 int outpipe[2] = {-1, -1};
126 int errpipe[2] = {-1, -1};
128 char arg[UTIL_PATH_SIZE];
129 char program[UTIL_PATH_SIZE];
130 char *argv[(sizeof(arg) / 2) + 1];
135 /* build argv from command */
136 util_strlcpy(arg, command, sizeof(arg));
138 if (strchr(arg, ' ') != NULL) {
141 while (pos != NULL) {
142 if (pos[0] == '\'') {
143 /* don't separate if in apostrophes */
145 argv[i] = strsep(&pos, "\'");
146 while (pos != NULL && pos[0] == ' ')
149 argv[i] = strsep(&pos, " ");
151 dbg(udev, "arg[%i] '%s'\n", i, argv[i]);
159 info(udev, "'%s'\n", command);
161 /* prepare pipes from child to parent */
162 if (result != NULL || udev_get_log_priority(udev) >= LOG_INFO) {
163 if (pipe(outpipe) != 0) {
164 err(udev, "pipe failed: %m\n");
168 if (udev_get_log_priority(udev) >= LOG_INFO) {
169 if (pipe(errpipe) != 0) {
170 err(udev, "pipe failed: %m\n");
175 /* allow programs in /lib/udev/ to be called without the path */
176 if (strchr(argv[0], '/') == NULL) {
177 util_strlcpy(program, UDEV_PREFIX "/lib/udev/", sizeof(program));
178 util_strlcat(program, argv[0], sizeof(program));
182 envp = udev_device_get_properties_envp(dev);
187 /* child closes parent ends of pipes */
188 if (outpipe[READ_END] > 0)
189 close(outpipe[READ_END]);
190 if (errpipe[READ_END] > 0)
191 close(errpipe[READ_END]);
193 /* discard child output or connect to pipe */
194 devnull = open("/dev/null", O_RDWR);
196 dup2(devnull, STDIN_FILENO);
197 if (outpipe[WRITE_END] < 0)
198 dup2(devnull, STDOUT_FILENO);
199 if (errpipe[WRITE_END] < 0)
200 dup2(devnull, STDERR_FILENO);
203 err(udev, "open /dev/null failed: %m\n");
204 if (outpipe[WRITE_END] > 0) {
205 dup2(outpipe[WRITE_END], STDOUT_FILENO);
206 close(outpipe[WRITE_END]);
208 if (errpipe[WRITE_END] > 0) {
209 dup2(errpipe[WRITE_END], STDERR_FILENO);
210 close(errpipe[WRITE_END]);
212 execve(argv[0], argv, envp);
213 if (errno == ENOENT || errno == ENOTDIR) {
214 /* may be on a filesytem which is not mounted right now */
215 info(udev, "program '%s' not found\n", argv[0]);
218 err(udev, "exec of program '%s' failed\n", argv[0]);
222 err(udev, "fork of '%s' failed: %m\n", argv[0]);
225 /* read from child if requested */
226 if (outpipe[READ_END] > 0 || errpipe[READ_END] > 0) {
230 /* parent closes child ends of pipes */
231 if (outpipe[WRITE_END] > 0)
232 close(outpipe[WRITE_END]);
233 if (errpipe[WRITE_END] > 0)
234 close(errpipe[WRITE_END]);
236 /* read child output */
237 while (outpipe[READ_END] > 0 || errpipe[READ_END] > 0) {
242 if (outpipe[READ_END] > 0)
243 FD_SET(outpipe[READ_END], &readfds);
244 if (errpipe[READ_END] > 0)
245 FD_SET(errpipe[READ_END], &readfds);
246 fdcount = select(UDEV_MAX(outpipe[READ_END], errpipe[READ_END])+1, &readfds, NULL, NULL, NULL);
255 if (outpipe[READ_END] > 0 && FD_ISSET(outpipe[READ_END], &readfds)) {
260 count = read(outpipe[READ_END], inbuf, sizeof(inbuf)-1);
262 close(outpipe[READ_END]);
263 outpipe[READ_END] = -1;
265 err(udev, "stdin read failed: %m\n");
272 /* store result for rule processing */
274 if (respos + count < ressize) {
275 memcpy(&result[respos], inbuf, count);
278 err(udev, "ressize %ld too short\n", (long)ressize);
283 while ((line = strsep(&pos, "\n")))
284 if (pos || line[0] != '\0')
285 info(udev, "'%s' (stdout) '%s'\n", argv[0], line);
289 if (errpipe[READ_END] > 0 && FD_ISSET(errpipe[READ_END], &readfds)) {
294 count = read(errpipe[READ_END], errbuf, sizeof(errbuf)-1);
296 close(errpipe[READ_END]);
297 errpipe[READ_END] = -1;
299 err(udev, "stderr read failed: %m\n");
302 errbuf[count] = '\0';
304 while ((line = strsep(&pos, "\n")))
305 if (pos || line[0] != '\0')
306 info(udev, "'%s' (stderr) '%s'\n", argv[0], line);
309 if (outpipe[READ_END] > 0)
310 close(outpipe[READ_END]);
311 if (errpipe[READ_END] > 0)
312 close(errpipe[READ_END]);
314 /* return the childs stdout string */
316 result[respos] = '\0';
317 dbg(udev, "result='%s'\n", result);
322 waitpid(pid, &status, 0);
323 if (WIFEXITED(status)) {
324 info(udev, "'%s' returned with status %i\n", argv[0], WEXITSTATUS(status));
325 if (WEXITSTATUS(status) != 0)
328 err(udev, "'%s' abnormal exit\n", argv[0]);
336 static int import_keys_into_env(struct udev_event *event, const char *buf, size_t bufsize)
338 struct udev_device *dev = event->dev;
339 char line[UTIL_LINE_SIZE];
348 /* loop through the whole buffer */
351 while (cur < bufsize) {
352 count = buf_get_line(buf, bufsize, cur);
357 /* eat the whitespace */
358 while ((count > 0) && isspace(bufline[0])) {
365 /* see if this is a comment */
366 if (bufline[0] == '#')
369 if (count >= sizeof(line)) {
370 err(event->udev, "line too long, skipped\n");
374 memcpy(line, bufline, count);
378 if (get_key(&linepos, &variable, &value) == 0) {
379 char syspath[UTIL_PATH_SIZE];
381 dbg(event->udev, "import '%s=%s'\n", variable, value);
382 /* handle device, renamed by external tool, returning new path */
383 if (strcmp(variable, "DEVPATH") == 0) {
384 info(event->udev, "updating devpath from '%s' to '%s'\n",
385 udev_device_get_devpath(dev), value);
386 util_strlcpy(syspath, udev_get_sys_path(event->udev), sizeof(syspath));
387 util_strlcat(syspath, value, sizeof(syspath));
388 udev_device_set_syspath(dev, syspath);
390 struct udev_list_entry *entry;
392 entry = udev_device_add_property(dev, variable, value);
394 udev_list_entry_set_flag(entry, 1);
401 static int import_file_into_env(struct udev_event *event, const char *filename)
406 if (file_map(filename, &buf, &bufsize) != 0) {
407 err(event->udev, "can't open '%s': %m\n", filename);
410 import_keys_into_env(event, buf, bufsize);
411 file_unmap(buf, bufsize);
416 static int import_program_into_env(struct udev_event *event, const char *program)
421 if (run_program(event->dev, program, result, sizeof(result), &reslen) != 0)
423 return import_keys_into_env(event, result, reslen);
426 static int import_parent_into_env(struct udev_event *event, const char *filter)
428 struct udev_device *dev_parent;
429 struct udev_list_entry *list_entry;
431 dev_parent = udev_device_get_parent(event->dev);
432 if (dev_parent == NULL)
435 dbg(event->udev, "found parent '%s', get the node name\n", udev_device_get_syspath(dev_parent));
436 udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(dev_parent)) {
437 const char *key = udev_list_entry_get_name(list_entry);
438 const char *val = udev_list_entry_get_value(list_entry);
440 if (fnmatch(filter, key, 0) == 0) {
441 struct udev_list_entry *entry;
443 dbg(event->udev, "import key '%s=%s'\n", key, val);
444 entry = udev_device_add_property(event->dev, key, val);
446 udev_list_entry_set_flag(entry, 1);
452 int udev_rules_run(struct udev_event *event)
454 struct udev_list_entry *list_entry;
457 dbg(event->udev, "executing run list\n");
458 udev_list_entry_foreach(list_entry, udev_list_get_entry(&event->run_list)) {
459 const char *cmd = udev_list_entry_get_name(list_entry);
461 if (strncmp(cmd, "socket:", strlen("socket:")) == 0) {
462 struct udev_monitor *monitor;
464 monitor = udev_monitor_new_from_socket(event->udev, &cmd[strlen("socket:")]);
467 udev_monitor_send_device(monitor, event->dev);
468 udev_monitor_unref(monitor);
470 char program[UTIL_PATH_SIZE];
472 util_strlcpy(program, cmd, sizeof(program));
473 udev_rules_apply_format(event, program, sizeof(program));
474 if (run_program(event->dev, program, NULL, 0, NULL) != 0) {
475 if (!udev_list_entry_get_flag(list_entry))
483 #define WAIT_LOOP_PER_SECOND 50
484 static int wait_for_file(struct udev_event *event, const char *file, int timeout)
486 char filepath[UTIL_PATH_SIZE];
487 char devicepath[UTIL_PATH_SIZE] = "";
489 int loop = timeout * WAIT_LOOP_PER_SECOND;
491 /* a relative path is a device attribute */
492 if (file[0] != '/') {
493 util_strlcpy(devicepath, udev_get_sys_path(event->udev), sizeof(devicepath));
494 util_strlcat(devicepath, udev_device_get_devpath(event->dev), sizeof(devicepath));
496 util_strlcpy(filepath, devicepath, sizeof(filepath));
497 util_strlcat(filepath, "/", sizeof(filepath));
498 util_strlcat(filepath, file, sizeof(filepath));
502 dbg(event->udev, "will wait %i sec for '%s'\n", timeout, file);
505 if (stat(file, &stats) == 0) {
506 info(event->udev, "file '%s' appeared after %i loops\n", file, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
509 /* make sure, the device did not disappear in the meantime */
510 if (devicepath[0] != '\0' && stat(devicepath, &stats) != 0) {
511 info(event->udev, "device disappeared while waiting for '%s'\n", file);
514 info(event->udev, "wait for '%s' for %i mseconds\n", file, 1000 / WAIT_LOOP_PER_SECOND);
515 usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
517 info(event->udev, "waiting for '%s' failed\n", file);
521 /* handle "[$SUBSYSTEM/$KERNEL]<attribute>" lookup */
522 static int split_subsys_sysname(struct udev *udev, char *attrstr, char **subsys, char **sysname, char **attr)
526 if (attrstr[0] != '[')
529 *subsys = &attrstr[1];
530 pos = strchr(*subsys, ']');
543 pos = strchr(*subsys, '/');
551 static int attr_subst_subdir(char *attr, size_t len)
556 pos = strstr(attr, "/*/");
558 char str[UTIL_PATH_SIZE];
562 util_strlcpy(str, &pos[2], sizeof(str));
567 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
570 if (dent->d_name[0] == '.')
572 util_strlcat(attr, dent->d_name, len);
573 util_strlcat(attr, str, len);
574 if (stat(attr, &stats) == 0) {
583 util_strlcat(attr, str, len);
589 void udev_rules_apply_format(struct udev_event *event, char *string, size_t maxsize)
591 struct udev_device *dev = event->dev;
592 char temp[UTIL_PATH_SIZE];
593 char temp2[UTIL_PATH_SIZE];
594 char *head, *tail, *cpos, *attr, *rest;
617 static const struct subst_map {
620 enum subst_type type;
622 { .name = "devpath", .fmt = 'p', .type = SUBST_DEVPATH },
623 { .name = "number", .fmt = 'n', .type = SUBST_KERNEL_NUMBER },
624 { .name = "kernel", .fmt = 'k', .type = SUBST_KERNEL },
625 { .name = "id", .fmt = 'b', .type = SUBST_ID },
626 { .name = "driver", .fmt = 'd', .type = SUBST_DRIVER },
627 { .name = "major", .fmt = 'M', .type = SUBST_MAJOR },
628 { .name = "minor", .fmt = 'm', .type = SUBST_MINOR },
629 { .name = "result", .fmt = 'c', .type = SUBST_RESULT },
630 { .name = "attr", .fmt = 's', .type = SUBST_ATTR },
631 { .name = "sysfs", .fmt = 's', .type = SUBST_ATTR },
632 { .name = "parent", .fmt = 'P', .type = SUBST_PARENT },
633 { .name = "tempnode", .fmt = 'N', .type = SUBST_TEMP_NODE },
634 { .name = "name", .fmt = 'D', .type = SUBST_NAME },
635 { .name = "links", .fmt = 'L', .type = SUBST_LINKS },
636 { .name = "root", .fmt = 'r', .type = SUBST_ROOT },
637 { .name = "sys", .fmt = 'S', .type = SUBST_SYS },
638 { .name = "env", .fmt = 'E', .type = SUBST_ENV },
641 enum subst_type type;
642 const struct subst_map *subst;
647 while (head[0] != '\0') {
648 if (head[0] == '$') {
649 /* substitute named variable */
652 if (head[1] == '$') {
653 util_strlcpy(temp, head+2, sizeof(temp));
654 util_strlcpy(head+1, temp, maxsize);
659 for (subst = map; subst->name; subst++) {
660 if (strncasecmp(&head[1], subst->name, strlen(subst->name)) == 0) {
662 tail = head + strlen(subst->name)+1;
663 dbg(event->udev, "will substitute format name '%s'\n", subst->name);
668 err(event->udev, "unknown format variable '%s'\n", head);
669 } else if (head[0] == '%') {
670 /* substitute format char */
673 if (head[1] == '%') {
674 util_strlcpy(temp, head+2, sizeof(temp));
675 util_strlcpy(head+1, temp, maxsize);
681 len = get_format_len(event->udev, &tail);
682 for (subst = map; subst->name; subst++) {
683 if (tail[0] == subst->fmt) {
686 dbg(event->udev, "will substitute format char '%c'\n", subst->fmt);
691 err(event->udev, "unknown format char '%c'\n", tail[0]);
697 attr = get_format_attribute(event->udev, &tail);
698 util_strlcpy(temp, tail, sizeof(temp));
699 dbg(event->udev, "format=%i, string='%s', tail='%s'\n", type ,string, tail);
703 util_strlcat(string, udev_device_get_devpath(dev), maxsize);
704 dbg(event->udev, "substitute devpath '%s'\n", udev_device_get_devpath(dev));
707 util_strlcat(string, udev_device_get_sysname(dev), maxsize);
708 dbg(event->udev, "substitute kernel name '%s'\n", udev_device_get_sysname(dev));
710 case SUBST_KERNEL_NUMBER:
711 if (udev_device_get_sysnum(dev) == NULL)
713 util_strlcat(string, udev_device_get_sysnum(dev), maxsize);
714 dbg(event->udev, "substitute kernel number '%s'\n", udev_device_get_sysnum(dev));
717 if (event->dev_parent != NULL) {
718 util_strlcat(string, udev_device_get_sysname(event->dev_parent), maxsize);
719 dbg(event->udev, "substitute id '%s'\n", udev_device_get_sysname(event->dev_parent));
723 if (event->dev_parent != NULL) {
724 const char *driver = udev_device_get_driver(event->dev_parent);
728 util_strlcat(string, driver, maxsize);
729 dbg(event->udev, "substitute driver '%s'\n", driver);
733 sprintf(temp2, "%d", major(udev_device_get_devnum(dev)));
734 util_strlcat(string, temp2, maxsize);
735 dbg(event->udev, "substitute major number '%s'\n", temp2);
738 sprintf(temp2, "%d", minor(udev_device_get_devnum(dev)));
739 util_strlcat(string, temp2, maxsize);
740 dbg(event->udev, "substitute minor number '%s'\n", temp2);
743 if (event->program_result[0] == '\0')
745 /* get part part of the result string */
748 i = strtoul(attr, &rest, 10);
750 dbg(event->udev, "request part #%d of result string\n", i);
751 cpos = event->program_result;
753 while (cpos[0] != '\0' && !isspace(cpos[0]))
755 while (isspace(cpos[0]))
759 err(event->udev, "requested part of result string not found\n");
762 util_strlcpy(temp2, cpos, sizeof(temp2));
763 /* %{2+}c copies the whole string from the second part on */
764 if (rest[0] != '+') {
765 cpos = strchr(temp2, ' ');
769 util_strlcat(string, temp2, maxsize);
770 dbg(event->udev, "substitute part of result string '%s'\n", temp2);
772 util_strlcat(string, event->program_result, maxsize);
773 dbg(event->udev, "substitute result string '%s'\n", event->program_result);
778 err(event->udev, "missing file parameter for attr\n");
783 char value[UTIL_NAME_SIZE] = "";
786 if (split_subsys_sysname(event->udev, attr, &subsys, &sysname, &attrib) == 0) {
787 struct udev_device *d;
792 d = udev_device_new_from_subsystem_sysname(event->udev, subsys, sysname);
795 val = udev_device_get_attr_value(d, attrib);
797 util_strlcpy(value, val, sizeof(value));
798 udev_device_unref(d);
801 /* try the current device, other matches may have selected */
802 if (value[0]=='\0' && event->dev_parent != NULL && event->dev_parent != event->dev) {
805 val = udev_device_get_attr_value(event->dev_parent, attr);
807 util_strlcpy(value, val, sizeof(value));
810 /* look at all devices along the chain of parents */
811 if (value[0]=='\0') {
812 struct udev_device *dev_parent = dev;
816 dbg(event->udev, "looking at '%s'\n", udev_device_get_syspath(dev_parent));
817 val = udev_device_get_attr_value(dev_parent, attr);
819 util_strlcpy(value, val, sizeof(value));
822 dev_parent = udev_device_get_parent(dev_parent);
823 } while (dev_parent != NULL);
829 /* strip trailing whitespace, and replace unwanted characters */
830 size = strlen(value);
831 while (size > 0 && isspace(value[--size]))
833 count = util_replace_chars(value, ALLOWED_CHARS_INPUT);
835 info(event->udev, "%i character(s) replaced\n" , count);
836 util_strlcat(string, value, maxsize);
837 dbg(event->udev, "substitute sysfs value '%s'\n", value);
842 struct udev_device *dev_parent;
845 dev_parent = udev_device_get_parent(event->dev);
846 if (dev_parent == NULL)
848 devnode = udev_device_get_devnode(dev_parent);
849 if (devnode != NULL) {
850 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
852 util_strlcat(string, &devnode[devlen], maxsize);
853 dbg(event->udev, "found parent '%s', got node name '%s'\n",
854 udev_device_get_syspath(dev_parent), &devnode[devlen]);
858 case SUBST_TEMP_NODE:
859 if (event->tmp_node[0] == '\0' && major(udev_device_get_devnum(dev)) > 0) {
860 dbg(event->udev, "create temporary device node for callout\n");
861 snprintf(event->tmp_node, sizeof(event->tmp_node), "%s/.tmp-%u-%u",
862 udev_get_dev_path(event->udev),
863 major(udev_device_get_devnum(dev)), minor(udev_device_get_devnum(dev)));
864 udev_node_mknod(dev, event->tmp_node, makedev(0,0), 0600, 0, 0);
866 util_strlcat(string, event->tmp_node, maxsize);
867 dbg(event->udev, "substitute temporary device node name '%s'\n", event->tmp_node);
870 if (event->name != NULL) {
871 util_strlcat(string, event->name, maxsize);
872 dbg(event->udev, "substitute name '%s'\n", event->name);
874 util_strlcat(string, udev_device_get_sysname(dev), maxsize);
875 dbg(event->udev, "substitute sysname '%s'\n", udev_device_get_sysname(dev));
880 struct udev_list_entry *list_entry;
882 list_entry = udev_device_get_properties_list_entry(dev);
883 util_strlcpy(string, udev_list_entry_get_name(list_entry), maxsize);
884 udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry)) {
885 util_strlcat(string, " ", maxsize);
886 util_strlcat(string, udev_list_entry_get_name(list_entry), maxsize);
891 util_strlcat(string, udev_get_dev_path(event->udev), maxsize);
892 dbg(event->udev, "substitute udev_root '%s'\n", udev_get_dev_path(event->udev));
895 util_strlcat(string, udev_get_sys_path(event->udev), maxsize);
896 dbg(event->udev, "substitute sys_path '%s'\n", udev_get_sys_path(event->udev));
900 dbg(event->udev, "missing attribute\n");
903 struct udev_list_entry *list_entry;
906 list_entry = udev_device_get_properties_list_entry(event->dev);
907 list_entry = udev_list_entry_get_by_name(list_entry, attr);
908 if (list_entry == NULL)
910 value = udev_list_entry_get_value(list_entry);
911 dbg(event->udev, "substitute env '%s=%s'\n", attr, value);
912 util_strlcat(string, value, maxsize);
916 err(event->udev, "unknown substitution type=%i\n", type);
919 /* possibly truncate to format-char specified length */
920 if (len >= 0 && len < (int)strlen(head)) {
922 dbg(event->udev, "truncate to %i chars, subtitution string becomes '%s'\n", len, head);
924 util_strlcat(string, temp, maxsize);
928 static char *key_val(struct udev_rule *rule, struct key *key)
930 return rule->buf + key->val_off;
933 static char *key_pair_name(struct udev_rule *rule, struct key_pair *pair)
935 return rule->buf + pair->key_name_off;
938 static int match_key(struct udev *udev, const char *key_name, struct udev_rule *rule, struct key *key, const char *val)
940 char value[UTIL_PATH_SIZE];
945 if (key->operation != KEY_OP_MATCH &&
946 key->operation != KEY_OP_NOMATCH)
952 /* look for a matching string, parts are separated by '|' */
953 util_strlcpy(value, rule->buf + key->val_off, sizeof(value));
955 dbg(udev, "key %s value='%s'\n", key_name, key_value);
956 while (key_value != NULL) {
957 pos = strchr(key_value, '|');
963 dbg(udev, "match %s '%s' <-> '%s'\n", key_name, key_value, val);
964 match = (fnmatch(key_value, val, 0) == 0);
971 if (match && (key->operation == KEY_OP_MATCH)) {
972 dbg(udev, "%s is true (matching value)\n", key_name);
975 if (!match && (key->operation == KEY_OP_NOMATCH)) {
976 dbg(udev, "%s is true (non-matching value)\n", key_name);
982 /* match a single rule against a given device and possibly its parent devices */
983 static int match_rule(struct udev_event *event, struct udev_rule *rule)
985 struct udev_device *dev = event->dev;
988 if (match_key(event->udev, "ACTION", rule, &rule->action, udev_device_get_action(dev)))
991 if (match_key(event->udev, "KERNEL", rule, &rule->kernel, udev_device_get_sysname(dev)))
994 if (match_key(event->udev, "SUBSYSTEM", rule, &rule->subsystem, udev_device_get_subsystem(dev)))
997 if (match_key(event->udev, "DEVPATH", rule, &rule->devpath, udev_device_get_devpath(dev)))
1000 if (match_key(event->udev, "DRIVER", rule, &rule->driver, udev_device_get_driver(dev)))
1003 /* match NAME against a value assigned by an earlier rule */
1004 if (match_key(event->udev, "NAME", rule, &rule->name, event->name))
1007 /* match against current list of symlinks */
1008 if (rule->symlink_match.operation == KEY_OP_MATCH ||
1009 rule->symlink_match.operation == KEY_OP_NOMATCH) {
1010 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
1011 struct udev_list_entry *list_entry;
1014 udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(dev)) {
1015 const char *devlink;
1017 devlink = &udev_list_entry_get_name(list_entry)[devlen];
1018 if (match_key(event->udev, "SYMLINK", rule, &rule->symlink_match, devlink) == 0) {
1027 for (i = 0; i < rule->env.count; i++) {
1028 struct key_pair *pair = &rule->env.keys[i];
1030 /* we only check for matches, assignments will be handled later */
1031 if (pair->key.operation == KEY_OP_MATCH ||
1032 pair->key.operation == KEY_OP_NOMATCH) {
1033 struct udev_list_entry *list_entry;
1034 const char *key_name = key_pair_name(rule, pair);
1037 list_entry = udev_device_get_properties_list_entry(event->dev);
1038 list_entry = udev_list_entry_get_by_name(list_entry, key_name);
1039 value = udev_list_entry_get_value(list_entry);
1040 if (value == NULL) {
1041 dbg(event->udev, "ENV{%s} is not set, treat as empty\n", key_name);
1044 if (match_key(event->udev, "ENV", rule, &pair->key, value))
1049 if (rule->test.operation == KEY_OP_MATCH ||
1050 rule->test.operation == KEY_OP_NOMATCH) {
1051 char filename[UTIL_PATH_SIZE];
1055 struct stat statbuf;
1058 util_strlcpy(filename, key_val(rule, &rule->test), sizeof(filename));
1059 udev_rules_apply_format(event, filename, sizeof(filename));
1061 if (split_subsys_sysname(event->udev, filename, &subsys, &sysname, &attrib) == 0) {
1062 struct udev_device *d;
1063 d = udev_device_new_from_subsystem_sysname(event->udev, subsys, sysname);
1065 util_strlcpy(filename, udev_device_get_syspath(d), sizeof(filename));
1066 if (attrib != NULL) {
1067 util_strlcat(filename, "/", sizeof(filename));
1068 util_strlcat(filename, attrib, sizeof(filename));
1070 udev_device_unref(d);
1072 } else if (filename[0] != '/') {
1073 char tmp[UTIL_PATH_SIZE];
1075 util_strlcpy(tmp, udev_device_get_syspath(dev), sizeof(tmp));
1076 util_strlcat(tmp, "/", sizeof(tmp));
1077 util_strlcat(tmp, filename, sizeof(tmp));
1078 util_strlcpy(filename, tmp, sizeof(filename));
1081 attr_subst_subdir(filename, sizeof(filename));
1083 match = (stat(filename, &statbuf) == 0);
1084 info(event->udev, "'%s' %s", filename, match ? "exists\n" : "does not exist\n");
1085 if (match && rule->test_mode_mask > 0) {
1086 match = ((statbuf.st_mode & rule->test_mode_mask) > 0);
1087 info(event->udev, "'%s' has mode=%#o and %s %#o\n", filename, statbuf.st_mode,
1088 match ? "matches" : "does not match",
1089 rule->test_mode_mask);
1091 if (match && rule->test.operation == KEY_OP_NOMATCH)
1093 if (!match && rule->test.operation == KEY_OP_MATCH)
1095 dbg(event->udev, "TEST key is true\n");
1098 if (rule->wait_for.operation != KEY_OP_UNSET) {
1099 char filename[UTIL_PATH_SIZE];
1102 util_strlcpy(filename, key_val(rule, &rule->wait_for), sizeof(filename));
1103 udev_rules_apply_format(event, filename, sizeof(filename));
1104 found = (wait_for_file(event, filename, 10) == 0);
1105 if (!found && (rule->wait_for.operation != KEY_OP_NOMATCH))
1109 /* check for matching sysfs attribute pairs */
1110 for (i = 0; i < rule->attr.count; i++) {
1111 struct key_pair *pair = &rule->attr.keys[i];
1113 if (pair->key.operation == KEY_OP_MATCH ||
1114 pair->key.operation == KEY_OP_NOMATCH) {
1115 char attr[UTIL_PATH_SIZE];
1116 const char *key_name = key_pair_name(rule, pair);
1117 const char *key_value = key_val(rule, &pair->key);
1121 char value[UTIL_NAME_SIZE] = "";
1124 util_strlcpy(attr, key_name, sizeof(attr));
1125 if (split_subsys_sysname(event->udev, attr, &subsys, &sysname, &attrib) == 0) {
1126 struct udev_device *d;
1131 d = udev_device_new_from_subsystem_sysname(event->udev, subsys, sysname);
1134 val = udev_device_get_attr_value(d, attrib);
1136 util_strlcpy(value, val, sizeof(value));
1137 udev_device_unref(d);
1140 if (value[0]=='\0') {
1143 val = udev_device_get_attr_value(dev, key_name);
1145 util_strlcpy(value, val, sizeof(value));
1151 /* strip trailing whitespace of value, if not asked to match for it */
1152 len = strlen(key_value);
1153 if (len > 0 && !isspace(key_value[len-1])) {
1154 len = strlen(value);
1155 while (len > 0 && isspace(value[--len]))
1157 dbg(event->udev, "removed trailing whitespace from '%s'\n", value);
1160 if (match_key(event->udev, "ATTR", rule, &pair->key, value))
1165 /* walk up the chain of parent devices and find a match */
1166 event->dev_parent = dev;
1168 /* check for matching kernel device name */
1169 if (match_key(event->udev, "KERNELS", rule,
1170 &rule->kernels, udev_device_get_sysname(event->dev_parent)))
1173 /* check for matching subsystem value */
1174 if (match_key(event->udev, "SUBSYSTEMS", rule,
1175 &rule->subsystems, udev_device_get_subsystem(event->dev_parent)))
1178 /* check for matching driver */
1179 if (match_key(event->udev, "DRIVERS", rule,
1180 &rule->drivers, udev_device_get_driver(event->dev_parent)))
1183 /* check for matching sysfs attribute pairs */
1184 for (i = 0; i < rule->attrs.count; i++) {
1185 struct key_pair *pair = &rule->attrs.keys[i];
1187 if (pair->key.operation == KEY_OP_MATCH ||
1188 pair->key.operation == KEY_OP_NOMATCH) {
1189 const char *key_name = key_pair_name(rule, pair);
1190 const char *key_value = key_val(rule, &pair->key);
1192 char value[UTIL_NAME_SIZE];
1195 val = udev_device_get_attr_value(event->dev_parent, key_name);
1197 val = udev_device_get_attr_value(dev, key_name);
1200 util_strlcpy(value, val, sizeof(value));
1202 /* strip trailing whitespace of value, if not asked to match for it */
1203 len = strlen(key_value);
1204 if (len > 0 && !isspace(key_value[len-1])) {
1205 len = strlen(value);
1206 while (len > 0 && isspace(value[--len]))
1208 dbg(event->udev, "removed trailing whitespace from '%s'\n", value);
1211 if (match_key(event->udev, "ATTRS", rule, &pair->key, value))
1216 /* found matching device */
1219 /* move to parent device */
1220 dbg(event->udev, "try parent sysfs device\n");
1221 event->dev_parent = udev_device_get_parent(event->dev_parent);
1222 if (event->dev_parent == NULL)
1224 dbg(event->udev, "looking at dev_parent->devpath='%s'\n",
1225 udev_device_get_syspath(event->dev_parent));
1228 /* execute external program */
1229 if (rule->program.operation != KEY_OP_UNSET) {
1230 char program[UTIL_PATH_SIZE];
1231 char result[UTIL_PATH_SIZE];
1233 util_strlcpy(program, key_val(rule, &rule->program), sizeof(program));
1234 udev_rules_apply_format(event, program, sizeof(program));
1235 if (run_program(event->dev, program, result, sizeof(result), NULL) != 0) {
1236 dbg(event->udev, "PROGRAM is false\n");
1237 event->program_result[0] = '\0';
1238 if (rule->program.operation != KEY_OP_NOMATCH)
1243 dbg(event->udev, "PROGRAM matches\n");
1244 util_remove_trailing_chars(result, '\n');
1245 if (rule->string_escape == ESCAPE_UNSET ||
1246 rule->string_escape == ESCAPE_REPLACE) {
1247 count = util_replace_chars(result, ALLOWED_CHARS_INPUT);
1249 info(event->udev, "%i character(s) replaced\n" , count);
1251 dbg(event->udev, "result is '%s'\n", result);
1252 util_strlcpy(event->program_result, result, sizeof(event->program_result));
1253 dbg(event->udev, "PROGRAM returned successful\n");
1254 if (rule->program.operation == KEY_OP_NOMATCH)
1257 dbg(event->udev, "PROGRAM key is true\n");
1260 /* check for matching result of external program */
1261 if (match_key(event->udev, "RESULT", rule, &rule->result, event->program_result))
1264 /* import variables returned from program or or file into environment */
1265 if (rule->import.operation != KEY_OP_UNSET) {
1266 char import[UTIL_PATH_SIZE];
1269 util_strlcpy(import, key_val(rule, &rule->import), sizeof(import));
1270 udev_rules_apply_format(event, import, sizeof(import));
1271 dbg(event->udev, "check for IMPORT import='%s'\n", import);
1272 if (rule->import_type == IMPORT_PROGRAM) {
1273 rc = import_program_into_env(event, import);
1274 } else if (rule->import_type == IMPORT_FILE) {
1275 dbg(event->udev, "import file import='%s'\n", import);
1276 rc = import_file_into_env(event, import);
1277 } else if (rule->import_type == IMPORT_PARENT) {
1278 dbg(event->udev, "import parent import='%s'\n", import);
1279 rc = import_parent_into_env(event, import);
1282 dbg(event->udev, "IMPORT failed\n");
1283 if (rule->import.operation != KEY_OP_NOMATCH)
1286 dbg(event->udev, "IMPORT '%s' imported\n", key_val(rule, &rule->import));
1287 dbg(event->udev, "IMPORT key is true\n");
1290 /* rule matches, if we have ENV assignments export it */
1291 for (i = 0; i < rule->env.count; i++) {
1292 struct key_pair *pair = &rule->env.keys[i];
1294 if (pair->key.operation == KEY_OP_ASSIGN) {
1295 char temp_value[UTIL_NAME_SIZE];
1296 const char *key_name = key_pair_name(rule, pair);
1297 const char *value = key_val(rule, &pair->key);
1299 /* make sure we don't write to the same string we possibly read from */
1300 util_strlcpy(temp_value, value, sizeof(temp_value));
1301 udev_rules_apply_format(event, temp_value, sizeof(temp_value));
1303 if (temp_value[0] != '\0') {
1304 struct udev_list_entry *entry;
1306 info(event->udev, "set ENV '%s=%s'\n", key_name, temp_value);
1307 entry = udev_device_add_property(dev, key_name, temp_value);
1309 udev_list_entry_set_flag(entry, 1);
1314 /* if we have ATTR assignments, write value to sysfs file */
1315 for (i = 0; i < rule->attr.count; i++) {
1316 struct key_pair *pair = &rule->attr.keys[i];
1318 if (pair->key.operation == KEY_OP_ASSIGN) {
1319 const char *key_name = key_pair_name(rule, pair);
1323 char attr[UTIL_PATH_SIZE];
1324 char value[UTIL_NAME_SIZE];
1327 util_strlcpy(attr, key_name, sizeof(attr));
1328 if (split_subsys_sysname(event->udev, attr, &subsys, &sysname, &attrib) == 0) {
1329 struct udev_device *d;
1331 d = udev_device_new_from_subsystem_sysname(event->udev, subsys, sysname);
1333 util_strlcpy(attr, udev_device_get_syspath(d), sizeof(attr));
1334 if (attrib != NULL) {
1335 util_strlcat(attr, "/", sizeof(attr));
1336 util_strlcat(attr, attrib, sizeof(attr));
1338 udev_device_unref(d);
1341 util_strlcpy(attr, udev_device_get_syspath(dev), sizeof(attr));
1342 util_strlcat(attr, "/", sizeof(attr));
1343 util_strlcat(attr, key_name, sizeof(attr));
1346 attr_subst_subdir(attr, sizeof(attr));
1348 util_strlcpy(value, key_val(rule, &pair->key), sizeof(value));
1349 udev_rules_apply_format(event, value, sizeof(value));
1350 info(event->udev, "writing '%s' to sysfs file '%s'\n", value, attr);
1351 f = fopen(attr, "w");
1354 if (fprintf(f, "%s", value) <= 0)
1355 err(event->udev, "error writing ATTR{%s}: %m\n", attr);
1358 err(event->udev, "error opening ATTR{%s} for writing: %m\n", attr);
1367 int udev_rules_get_name(struct udev_rules *rules, struct udev_event *event)
1369 struct udev_device *dev = event->dev;
1370 struct udev_rules_iter iter;
1371 struct udev_rule *rule;
1374 dbg(event->udev, "device: '%s'\n", udev_device_get_syspath(dev));
1376 /* look for a matching rule to apply */
1377 udev_rules_iter_init(&iter, rules);
1379 rule = udev_rules_iter_next(&iter);
1384 (rule->name.operation == KEY_OP_ASSIGN ||
1385 rule->name.operation == KEY_OP_ASSIGN_FINAL ||
1386 rule->name.operation == KEY_OP_ADD)) {
1387 dbg(event->udev, "node name already set, rule ignored\n");
1391 dbg(event->udev, "process rule\n");
1392 if (match_rule(event, rule) == 0) {
1394 if (rule->ignore_device) {
1395 info(event->udev, "rule applied, '%s' is ignored\n", udev_device_get_sysname(dev));
1396 event->ignore_device = 1;
1399 if (rule->ignore_remove) {
1400 udev_device_set_ignore_remove(dev, 1);
1401 dbg(event->udev, "remove event should be ignored\n");
1403 if (rule->link_priority != 0) {
1404 udev_device_set_devlink_priority(dev, rule->link_priority);
1405 info(event->udev, "devlink_priority=%i\n", rule->link_priority);
1407 if (rule->event_timeout >= 0) {
1408 udev_device_set_event_timeout(dev, rule->event_timeout);
1409 info(event->udev, "event_timeout=%i\n", rule->event_timeout);
1411 /* apply all_partitions option only at a disk device */
1412 if (rule->partitions > 0 &&
1413 strcmp(udev_device_get_subsystem(dev), "block") == 0 &&
1414 udev_device_get_sysnum(dev) == NULL) {
1415 udev_device_set_num_fake_partitions(dev, rule->partitions);
1416 dbg(event->udev, "creation of partition nodes requested\n");
1419 /* apply permissions */
1420 if (!event->mode_final && rule->mode.operation != KEY_OP_UNSET) {
1421 if (rule->mode.operation == KEY_OP_ASSIGN_FINAL)
1422 event->mode_final = 1;
1424 util_strlcpy(buf, key_val(rule, &rule->mode), sizeof(buf));
1425 udev_rules_apply_format(event, buf, sizeof(buf));
1426 event->mode = strtol(buf, NULL, 8);
1427 dbg(event->udev, "applied mode=%#o to '%s'\n",
1428 event->mode, udev_device_get_sysname(dev));
1430 if (!event->owner_final && rule->owner.operation != KEY_OP_UNSET) {
1431 if (rule->owner.operation == KEY_OP_ASSIGN_FINAL)
1432 event->owner_final = 1;
1433 util_strlcpy(event->owner, key_val(rule, &rule->owner), sizeof(event->owner));
1434 udev_rules_apply_format(event, event->owner, sizeof(event->owner));
1435 dbg(event->udev, "applied owner='%s' to '%s'\n",
1436 event->owner, udev_device_get_sysname(dev));
1438 if (!event->group_final && rule->group.operation != KEY_OP_UNSET) {
1439 if (rule->group.operation == KEY_OP_ASSIGN_FINAL)
1440 event->group_final = 1;
1441 util_strlcpy(event->group, key_val(rule, &rule->group), sizeof(event->group));
1442 udev_rules_apply_format(event, event->group, sizeof(event->group));
1443 dbg(event->udev, "applied group='%s' to '%s'\n",
1444 event->group, udev_device_get_sysname(dev));
1447 /* collect symlinks */
1448 if (!event->devlink_final &&
1449 (rule->symlink.operation == KEY_OP_ASSIGN ||
1450 rule->symlink.operation == KEY_OP_ASSIGN_FINAL ||
1451 rule->symlink.operation == KEY_OP_ADD)) {
1452 char temp[UTIL_PATH_SIZE];
1453 char filename[UTIL_PATH_SIZE];
1457 if (rule->symlink.operation == KEY_OP_ASSIGN_FINAL)
1458 event->devlink_final = 1;
1459 if (rule->symlink.operation == KEY_OP_ASSIGN ||
1460 rule->symlink.operation == KEY_OP_ASSIGN_FINAL) {
1461 info(event->udev, "reset symlink list\n");
1462 udev_device_cleanup_devlinks_list(dev);
1464 /* allow multiple symlinks separated by spaces */
1465 util_strlcpy(temp, key_val(rule, &rule->symlink), sizeof(temp));
1466 udev_rules_apply_format(event, temp, sizeof(temp));
1467 if (rule->string_escape == ESCAPE_UNSET)
1468 count = util_replace_chars(temp, ALLOWED_CHARS_FILE " ");
1469 else if (rule->string_escape == ESCAPE_REPLACE)
1470 count = util_replace_chars(temp, ALLOWED_CHARS_FILE);
1472 info(event->udev, "%i character(s) replaced\n" , count);
1473 dbg(event->udev, "rule applied, added symlink(s) '%s'\n", temp);
1475 while (isspace(pos[0]))
1477 next = strchr(pos, ' ');
1480 info(event->udev, "add symlink '%s'\n", pos);
1481 util_strlcpy(filename, udev_get_dev_path(event->udev), sizeof(filename));
1482 util_strlcat(filename, "/", sizeof(filename));
1483 util_strlcat(filename, pos, sizeof(filename));
1484 udev_device_add_devlink(dev, filename);
1485 while (isspace(next[1]))
1488 next = strchr(pos, ' ');
1490 if (pos[0] != '\0') {
1491 info(event->udev, "add symlink '%s'\n", pos);
1492 util_strlcpy(filename, udev_get_dev_path(event->udev), sizeof(filename));
1493 util_strlcat(filename, "/", sizeof(filename));
1494 util_strlcat(filename, pos, sizeof(filename));
1495 udev_device_add_devlink(dev, filename);
1499 /* set name, later rules with name set will be ignored */
1500 if (rule->name.operation == KEY_OP_ASSIGN ||
1501 rule->name.operation == KEY_OP_ASSIGN_FINAL ||
1502 rule->name.operation == KEY_OP_ADD) {
1506 util_strlcpy(event->name, key_val(rule, &rule->name), sizeof(event->name));
1507 udev_rules_apply_format(event, event->name, sizeof(event->name));
1508 if (rule->string_escape == ESCAPE_UNSET ||
1509 rule->string_escape == ESCAPE_REPLACE) {
1510 count = util_replace_chars(event->name, ALLOWED_CHARS_FILE);
1512 info(event->udev, "%i character(s) replaced\n", count);
1515 info(event->udev, "rule applied, '%s' becomes '%s'\n",
1516 udev_device_get_sysname(dev), event->name);
1517 if (strcmp(udev_device_get_subsystem(dev), "net") != 0)
1518 dbg(event->udev, "'%s' owner='%s', group='%s', mode=%#o partitions=%i\n",
1519 event->name, event->owner, event->group, event->mode,
1520 udev_device_get_num_fake_partitions(dev));
1523 if (!event->run_final && rule->run.operation != KEY_OP_UNSET) {
1524 struct udev_list_entry *list_entry;
1526 if (rule->run.operation == KEY_OP_ASSIGN_FINAL)
1527 event->run_final = 1;
1528 if (rule->run.operation == KEY_OP_ASSIGN || rule->run.operation == KEY_OP_ASSIGN_FINAL) {
1529 info(event->udev, "reset run list\n");
1530 udev_list_cleanup(event->udev, &event->run_list);
1532 dbg(event->udev, "add run '%s'\n", key_val(rule, &rule->run));
1533 list_entry = udev_list_entry_add(event->udev, &event->run_list,
1534 key_val(rule, &rule->run), NULL, 1, 0);
1535 if (rule->run_ignore_error && list_entry != NULL)
1536 udev_list_entry_set_flag(list_entry, 1);
1539 if (rule->last_rule) {
1540 dbg(event->udev, "last rule to be applied\n");
1544 if (rule->goto_label.operation != KEY_OP_UNSET) {
1545 dbg(event->udev, "moving forward to label '%s'\n", key_val(rule, &rule->goto_label));
1546 udev_rules_iter_goto(&iter, rule->goto_rule_off);
1552 info(event->udev, "no node name set, will use kernel name '%s'\n",
1553 udev_device_get_sysname(dev));
1554 util_strlcpy(event->name, udev_device_get_sysname(dev), sizeof(event->name));
1557 if (event->tmp_node[0] != '\0') {
1558 dbg(event->udev, "removing temporary device node\n");
1559 unlink_secure(event->udev, event->tmp_node);
1560 event->tmp_node[0] = '\0';
1565 int udev_rules_get_run(struct udev_rules *rules, struct udev_event *event)
1567 struct udev_device *dev = event->dev;
1568 struct udev_rules_iter iter;
1569 struct udev_rule *rule;
1571 dbg(event->udev, "sysname: '%s'\n", udev_device_get_sysname(dev));
1573 /* look for a matching rule to apply */
1574 udev_rules_iter_init(&iter, rules);
1576 rule = udev_rules_iter_next(&iter);
1580 dbg(event->udev, "process rule\n");
1581 if (rule->name.operation == KEY_OP_ASSIGN ||
1582 rule->name.operation == KEY_OP_ASSIGN_FINAL ||
1583 rule->name.operation == KEY_OP_ADD ||
1584 rule->symlink.operation == KEY_OP_ASSIGN ||
1585 rule->symlink.operation == KEY_OP_ASSIGN_FINAL ||
1586 rule->symlink.operation == KEY_OP_ADD ||
1587 rule->mode.operation != KEY_OP_UNSET ||
1588 rule->owner.operation != KEY_OP_UNSET || rule->group.operation != KEY_OP_UNSET) {
1589 dbg(event->udev, "skip rule that names a device\n");
1593 if (match_rule(event, rule) == 0) {
1594 if (rule->ignore_device) {
1595 info(event->udev, "rule applied, '%s' is ignored\n", udev_device_get_sysname(dev));
1596 event->ignore_device = 1;
1599 if (rule->ignore_remove) {
1600 udev_device_set_ignore_remove(dev, 1);
1601 dbg(event->udev, "remove event should be ignored\n");
1604 if (!event->run_final && rule->run.operation != KEY_OP_UNSET) {
1605 struct udev_list_entry *list_entry;
1607 if (rule->run.operation == KEY_OP_ASSIGN ||
1608 rule->run.operation == KEY_OP_ASSIGN_FINAL) {
1609 info(event->udev, "reset run list\n");
1610 udev_list_cleanup(event->udev, &event->run_list);
1612 dbg(event->udev, "add run '%s'\n", key_val(rule, &rule->run));
1613 list_entry = udev_list_entry_add(event->udev, &event->run_list,
1614 key_val(rule, &rule->run), NULL, 1, 0);
1615 if (rule->run_ignore_error && list_entry != NULL)
1616 udev_list_entry_set_flag(list_entry, 1);
1617 if (rule->run.operation == KEY_OP_ASSIGN_FINAL)
1621 if (rule->last_rule) {
1622 dbg(event->udev, "last rule to be applied\n");
1626 if (rule->goto_label.operation != KEY_OP_UNSET) {
1627 dbg(event->udev, "moving forward to label '%s'\n", key_val(rule, &rule->goto_label));
1628 udev_rules_iter_goto(&iter, rule->goto_rule_off);