6 * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
7 * Copyright (C) 2003-2005 Kay Sievers <kay.sievers@vrfy.org>
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the
12 * Free Software Foundation version 2 of the License.
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 675 Mass Ave, Cambridge, MA 02139, USA.
36 #include "libsysfs/sysfs/libsysfs.h"
39 #include "udev_utils.h"
40 #include "udev_version.h"
45 static struct sysfs_attribute *find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, char *attr);
47 /* compare string with pattern (supports * ? [0-9] [!A-Z]) */
48 static int strcmp_pattern(const char *p, const char *s)
53 return (p[0] != '\0');
64 while ((p[0] != '\0') && (p[0] != ']')) {
67 if ((s[0] >= p[0]) && (s[0] <= p[2]))
71 match = (p[0] == s[0]);
75 while ((p[0] != '\0') && (p[0] != ']'))
78 return strcmp_pattern(p+1, s+1);
84 if (strcmp_pattern(p, s+1))
85 return strcmp_pattern(p+1, s);
93 if ((p[0] == s[0]) || (p[0] == '?'))
94 return strcmp_pattern(p+1, s+1);
100 /* extract possible {attr} and move str behind it */
101 static char *get_format_attribute(char **str)
106 if (*str[0] == '{') {
107 pos = strchr(*str, '}');
109 dbg("missing closing brace for format");
115 dbg("attribute='%s', str='%s'", attr, *str);
120 /* extract possible format length and move str behind it*/
121 static int get_format_len(char **str)
126 if (isdigit(*str[0])) {
127 num = (int) strtoul(*str, &tail, 10);
130 dbg("format length=%i", num);
133 dbg("format parsing error '%s'", *str);
139 /** Finds the lowest positive N such that <name>N isn't present in
140 * $(udevroot) either as a file or a symlink.
142 * @param name Name to check for
143 * @return 0 if <name> didn't exist and N otherwise.
145 static int find_free_number(struct udevice *udev, const char *name)
147 char devpath[NAME_SIZE];
148 char filename[NAME_SIZE];
151 strfieldcpy(filename, name);
153 dbg("look for existing node '%s'", filename);
154 if (udev_db_search_name(devpath, DEVPATH_SIZE, filename) != 0) {
155 dbg("free num=%d", num);
161 info("find_free_number gone crazy (num=%d), aborted", num);
164 snprintf(filename, NAME_SIZE, "%s%d", name, num);
165 filename[NAME_SIZE-1] = '\0';
169 static void apply_format(struct udevice *udev, char *string, size_t maxsize,
170 struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
172 char temp[NAME_SIZE];
173 char temp2[NAME_SIZE];
174 char *tail, *pos, *cpos, *attr, *rest;
178 struct sysfs_attribute *tmpattr;
179 unsigned int next_free_number;
180 struct sysfs_class_device *class_dev_parent;
184 pos = strchr(pos, '%');
190 len = get_format_len(&tail);
192 strfieldcpy(temp, tail+1);
194 dbg("format=%c, string='%s', tail='%s'",c , string, tail);
195 attr = get_format_attribute(&tail);
199 strfieldcatmax(string, udev->devpath, maxsize);
200 dbg("substitute kernel name '%s'", udev->kernel_name);
203 strfieldcatmax(string, udev->bus_id, maxsize);
204 dbg("substitute bus_id '%s'", udev->bus_id);
207 strfieldcatmax(string, udev->kernel_name, maxsize);
208 dbg("substitute kernel name '%s'", udev->kernel_name);
211 strfieldcatmax(string, udev->kernel_number, maxsize);
212 dbg("substitute kernel number '%s'", udev->kernel_number);
215 sprintf(temp2, "%d", minor(udev->devt));
216 strfieldcatmax(string, temp2, maxsize);
217 dbg("substitute minor number '%s'", temp2);
220 sprintf(temp2, "%d", major(udev->devt));
221 strfieldcatmax(string, temp2, maxsize);
222 dbg("substitute major number '%s'", temp2);
225 if (udev->program_result[0] == '\0')
227 /* get part part of the result string */
230 i = strtoul(attr, &rest, 10);
232 dbg("request part #%d of result string", i);
233 cpos = udev->program_result;
235 while (cpos[0] != '\0' && !isspace(cpos[0]))
237 while (isspace(cpos[0]))
241 dbg("requested part of result string not found");
244 strfieldcpy(temp2, cpos);
245 /* %{2+}c copies the whole string from the second part on */
246 if (rest[0] != '+') {
247 cpos = strchr(temp2, ' ');
251 strfieldcatmax(string, temp2, maxsize);
252 dbg("substitute part of result string '%s'", temp2);
254 strfieldcatmax(string, udev->program_result, maxsize);
255 dbg("substitute result string '%s'", udev->program_result);
262 dbg("missing attribute");
265 tmpattr = find_sysfs_attribute(class_dev, sysfs_device, attr);
266 if (tmpattr == NULL) {
267 dbg("sysfa attribute '%s' not found", attr);
270 /* strip trailing whitespace of matching value */
271 if (isspace(tmpattr->value[strlen(tmpattr->value)-1])) {
272 i = len = strlen(tmpattr->value);
273 while (i > 0 && isspace(tmpattr->value[i-1]))
276 tmpattr->value[i] = '\0';
277 dbg("remove %i trailing whitespace chars from '%s'",
278 len - i, tmpattr->value);
281 strfieldcatmax(string, tmpattr->value, maxsize);
282 dbg("substitute sysfs value '%s'", tmpattr->value);
285 strfieldcatmax(string, "%", maxsize);
289 next_free_number = find_free_number(udev, string);
290 if (next_free_number > 0) {
291 sprintf(temp2, "%d", next_free_number);
292 strfieldcatmax(string, temp2, maxsize);
298 class_dev_parent = sysfs_get_classdev_parent(class_dev);
299 if (class_dev_parent != NULL) {
300 struct udevice udev_parent;
302 dbg("found parent '%s', get the node name", class_dev_parent->path);
303 udev_init_device(&udev_parent, NULL, NULL);
304 /* lookup the name in the udev_db with the DEVPATH of the parent */
305 if (udev_db_get_device(&udev_parent, &class_dev_parent->path[strlen(sysfs_path)]) == 0) {
306 strfieldcatmax(string, udev_parent.name, maxsize);
307 dbg("substitute parent node name'%s'", udev_parent.name);
309 dbg("parent not found in database");
310 udev_cleanup_device(&udev_parent);
314 if (udev->tmp_node[0] == '\0') {
315 dbg("create temporary device node for callout");
316 snprintf(udev->tmp_node, NAME_SIZE, "%s/.tmp-%u-%u", udev_root, major(udev->devt), minor(udev->devt));
317 udev->tmp_node[NAME_SIZE] = '\0';
318 udev_make_node(udev, udev->tmp_node, udev->devt, 0600, 0, 0);
320 strfieldcatmax(string, udev->tmp_node, maxsize);
321 dbg("substitute temporary device node name '%s'", udev->tmp_node);
324 strfieldcatmax(string, udev_root, maxsize);
325 dbg("substitute udev_root '%s'", udev_root);
328 dbg("unknown substitution type '%%%c'", c);
331 /* truncate to specified length */
335 strfieldcatmax(string, tail, maxsize);
339 static int execute_program(struct udevice *udev, const char *path, char *value, int len)
347 char arg[PROGRAM_SIZE];
348 char *argv[(PROGRAM_SIZE / 2) + 1];
351 strfieldcpy(arg, path);
353 if (strchr(path, ' ')) {
355 while (pos != NULL) {
356 if (pos[0] == '\'') {
357 /* don't separate if in apostrophes */
359 argv[i] = strsep(&pos, "\'");
360 while (pos && pos[0] == ' ')
363 argv[i] = strsep(&pos, " ");
365 dbg("arg[%i] '%s'", i, argv[i]);
369 dbg("execute '%s' with parsed arguments", arg);
372 argv[1] = udev->subsystem;
374 dbg("execute '%s' with subsystem '%s' argument", arg, argv[1]);
387 /* dup2 write side of pipe to STDOUT */
388 dup2(fds[1], STDOUT_FILENO);
389 retval = execv(arg, argv);
391 info(FIELD_PROGRAM " execution of '%s' failed", path);
397 /* parent reads from fds[0] */
402 count = read(fds[0], value + i, len - i-1);
408 dbg("result len %d too short", len);
415 dbg("read failed with '%s'", strerror(errno));
419 if (i > 0 && value[i-1] == '\n')
422 dbg("result is '%s'", value);
425 waitpid(pid, &status, 0);
427 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
428 dbg("exec program status 0x%x", status);
435 static struct sysfs_attribute *find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, char *attr)
437 struct sysfs_attribute *tmpattr = NULL;
440 dbg("look for device attribute '%s'", attr);
441 /* try to find the attribute in the class device directory */
442 tmpattr = sysfs_get_classdev_attr(class_dev, attr);
446 /* look in the class device directory if present */
448 tmpattr = sysfs_get_device_attr(sysfs_device, attr);
456 c = strchr(tmpattr->value, '\n');
460 dbg("found attribute '%s'", tmpattr->path);
464 static int compare_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, struct sysfs_pair *pair)
466 struct sysfs_attribute *tmpattr;
470 if ((pair == NULL) || (pair->file[0] == '\0') || (pair->value == '\0'))
473 tmpattr = find_sysfs_attribute(class_dev, sysfs_device, pair->file);
477 /* strip trailing whitespace of value, if not asked to match for it */
478 if (! isspace(pair->value[strlen(pair->value)-1])) {
479 i = len = strlen(tmpattr->value);
480 while (i > 0 && isspace(tmpattr->value[i-1]))
483 tmpattr->value[i] = '\0';
484 dbg("remove %i trailing whitespace chars from '%s'",
485 len - i, tmpattr->value);
489 dbg("compare attribute '%s' value '%s' with '%s'",
490 pair->file, tmpattr->value, pair->value);
491 if (strcmp_pattern(pair->value, tmpattr->value) != 0)
494 dbg("found matching attribute '%s' with value '%s'",
495 pair->file, pair->value);
499 static int match_sysfs_pairs(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
501 struct sysfs_pair *pair;
504 for (i = 0; i < MAX_SYSFS_PAIRS; ++i) {
505 pair = &dev->sysfs_pair[i];
506 if ((pair->file[0] == '\0') || (pair->value[0] == '\0'))
508 if (compare_sysfs_attribute(class_dev, sysfs_device, pair) != 0) {
509 dbg("sysfs attribute doesn't match");
517 static int match_id(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
519 char path[SYSFS_PATH_MAX];
522 /* we have to have a sysfs device for ID to work */
526 strfieldcpy(path, sysfs_device->path);
527 temp = strrchr(path, '/');
529 dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
530 if (strcmp_pattern(dev->id, temp) != 0)
536 static int match_place(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
538 char path[SYSFS_PATH_MAX];
541 /* we have to have a sysfs device for PLACE to work */
545 strfieldcpy(path, sysfs_device->path);
546 temp = strrchr(path, '/');
547 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
548 if (strstr(temp, dev->place) != NULL)
553 temp = strrchr(path, '/');
554 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
555 if (strstr(temp, dev->place) == NULL)
558 dbg("place doesn't match");
562 static int match_rule(struct udevice *udev, struct config_device *dev,
563 struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
565 if (dev->kernel[0] != '\0') {
566 dbg("check for " FIELD_KERNEL " dev->kernel='%s' class_dev->name='%s'",
567 dev->kernel, class_dev->name);
568 if (strcmp_pattern(dev->kernel, class_dev->name) != 0) {
569 dbg(FIELD_KERNEL " is not matching");
572 dbg(FIELD_KERNEL " matches");
575 if (dev->subsystem[0] != '\0') {
576 dbg("check for " FIELD_SUBSYSTEM " dev->subsystem='%s' class_dev->name='%s'",
577 dev->subsystem, class_dev->name);
578 if (strcmp_pattern(dev->subsystem, udev->subsystem) != 0) {
579 dbg(FIELD_SUBSYSTEM " is not matching");
582 dbg(FIELD_SUBSYSTEM " matches");
585 /* walk up the chain of physical devices and find a match */
587 /* check for matching driver */
588 if (dev->driver[0] != '\0') {
589 dbg("check for " FIELD_DRIVER " dev->driver='%s' sysfs_device->driver_name='%s'",
590 dev->driver, sysfs_device->driver_name);
591 if (strcmp_pattern(dev->driver, sysfs_device->driver_name) != 0) {
592 dbg(FIELD_DRIVER " is not matching");
595 dbg(FIELD_DRIVER " matches");
598 /* check for matching bus value */
599 if (dev->bus[0] != '\0') {
600 if (sysfs_device == NULL) {
601 dbg("device has no bus");
604 dbg("check for " FIELD_BUS " dev->bus='%s' sysfs_device->bus='%s'",
605 dev->bus, sysfs_device->bus);
606 if (strcmp_pattern(dev->bus, sysfs_device->bus) != 0) {
607 dbg(FIELD_BUS " is not matching");
610 dbg(FIELD_BUS " matches");
613 /* check for matching bus id */
614 if (dev->id[0] != '\0') {
615 dbg("check " FIELD_ID);
616 if (match_id(dev, class_dev, sysfs_device) != 0) {
617 dbg(FIELD_ID " is not matching");
620 dbg(FIELD_ID " matches");
623 /* check for matching place of device */
624 if (dev->place[0] != '\0') {
625 dbg("check " FIELD_PLACE);
626 if (match_place(dev, class_dev, sysfs_device) != 0) {
627 dbg(FIELD_PLACE " is not matching");
630 dbg(FIELD_PLACE " matches");
633 /* check for matching sysfs pairs */
634 if (dev->sysfs_pair[0].file[0] != '\0') {
635 dbg("check " FIELD_SYSFS " pairs");
636 if (match_sysfs_pairs(dev, class_dev, sysfs_device) != 0) {
637 dbg(FIELD_SYSFS " is not matching");
640 dbg(FIELD_SYSFS " matches");
643 /* found matching physical device */
646 dbg("try parent sysfs device");
647 sysfs_device = sysfs_get_device_parent(sysfs_device);
648 if (sysfs_device == NULL)
650 dbg("sysfs_device->path='%s'", sysfs_device->path);
651 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
654 /* execute external program */
655 if (dev->program[0] != '\0') {
656 char program[PROGRAM_SIZE];
658 dbg("check " FIELD_PROGRAM);
659 strfieldcpy(program, dev->program);
660 apply_format(udev, program, sizeof(program), class_dev, sysfs_device);
661 if (execute_program(udev, program, udev->program_result, NAME_SIZE) != 0) {
662 dbg(FIELD_PROGRAM " returned nonzero");
665 dbg(FIELD_PROGRAM " returned successful");
668 /* check for matching result of external program */
669 if (dev->result[0] != '\0') {
670 dbg("check for " FIELD_RESULT " dev->result='%s', udev->program_result='%s'",
671 dev->result, udev->program_result);
672 if (strcmp_pattern(dev->result, udev->program_result) != 0) {
673 dbg(FIELD_RESULT " is not matching");
676 dbg(FIELD_RESULT " matches");
686 int namedev_name_device(struct udevice *udev, struct sysfs_class_device *class_dev)
688 struct sysfs_class_device *class_dev_parent;
689 struct sysfs_device *sysfs_device = NULL;
690 struct config_device *dev;
692 dbg("class_dev->name='%s'", class_dev->name);
694 /* Figure out where the "device"-symlink is at. For char devices this will
695 * always be in the class_dev->path. On block devices, only the main block
696 * device will have the device symlink in it's path. All partition devices
697 * need to look at the symlink in its parent directory.
699 class_dev_parent = sysfs_get_classdev_parent(class_dev);
700 if (class_dev_parent != NULL) {
701 dbg("given class device has a parent, use this instead");
702 sysfs_device = sysfs_get_classdev_device(class_dev_parent);
704 sysfs_device = sysfs_get_classdev_device(class_dev);
708 dbg("found devices device: path='%s', bus_id='%s', bus='%s'",
709 sysfs_device->path, sysfs_device->bus_id, sysfs_device->bus);
710 strfieldcpy(udev->bus_id, sysfs_device->bus_id);
713 dbg("udev->kernel_name='%s'", udev->kernel_name);
715 /* look for a matching rule to apply */
716 list_for_each_entry(dev, &config_device_list, node) {
718 if (match_rule(udev, dev, class_dev, sysfs_device) == 0) {
721 if (dev->ignore_device) {
722 info("configured rule in '%s[%i]' applied, '%s' is ignored",
723 dev->config_file, dev->config_line, udev->kernel_name);
726 if (dev->ignore_remove) {
727 udev->ignore_remove = 1;
728 dbg_parse("remove event should be ignored");
730 /* apply all_partitions option only at a main block device */
731 if (dev->partitions && udev->type == BLOCK && udev->kernel_number[0] == '\0') {
732 udev->partitions = dev->partitions;
733 dbg("creation of partition nodes requested");
736 /* apply permissions */
737 if (dev->mode != 0000) {
738 udev->mode = dev->mode;
739 dbg("applied mode=%#o to '%s'", udev->mode, udev->kernel_name);
741 if (dev->owner[0] != '\0') {
742 strfieldcpy(udev->owner, dev->owner);
743 apply_format(udev, udev->owner, sizeof(udev->owner), class_dev, sysfs_device);
744 dbg("applied owner='%s' to '%s'", udev->owner, udev->kernel_name);
746 if (dev->group[0] != '\0') {
747 strfieldcpy(udev->group, dev->group);
748 apply_format(udev, udev->group, sizeof(udev->group), class_dev, sysfs_device);
749 dbg("applied group='%s' to '%s'", udev->group, udev->kernel_name);
752 /* collect symlinks */
753 if (dev->symlink[0] != '\0') {
754 char temp[NAME_SIZE];
757 info("configured rule in '%s[%i]' applied, added symlink '%s'",
758 dev->config_file, dev->config_line, dev->symlink);
759 strfieldcpy(temp, dev->symlink);
760 apply_format(udev, temp, sizeof(temp), class_dev, sysfs_device);
762 /* add multiple symlinks separated by spaces */
764 next = strchr(temp, ' ');
767 dbg("add symlink '%s'", pos);
768 name_list_add(&udev->symlink_list, pos, 0);
770 next = strchr(pos, ' ');
772 dbg("add symlink '%s'", pos);
773 name_list_add(&udev->symlink_list, pos, 0);
777 if (dev->name[0] != '\0') {
778 info("configured rule in '%s[%i]' applied, '%s' becomes '%s'",
779 dev->config_file, dev->config_line, udev->kernel_name, dev->name);
781 strfieldcpy(udev->name, dev->name);
782 apply_format(udev, udev->name, sizeof(udev->name), class_dev, sysfs_device);
783 strfieldcpy(udev->config_file, dev->config_file);
784 udev->config_line = dev->config_line;
786 if (udev->type != NET)
787 dbg("name, '%s' is going to have owner='%s', group='%s', mode=%#o partitions=%i",
788 udev->name, udev->owner, udev->group, udev->mode, udev->partitions);
795 if (udev->name[0] == '\0') {
796 /* no rule matched, so we use the kernel name */
797 strfieldcpy(udev->name, udev->kernel_name);
798 dbg("no rule found, use kernel name '%s'", udev->name);
801 if (udev->tmp_node[0] != '\0') {
802 dbg("removing temporary device node");
803 unlink_secure(udev->tmp_node);
804 udev->tmp_node[0] = '\0';