6 * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation version 2 of the License.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 675 Mass Ave, Cambridge, MA 02139, USA.
34 #include <sys/sysinfo.h>
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 LIST_HEAD(config_device_list);
48 LIST_HEAD(perm_device_list);
51 /* compare string with pattern (supports * ? [0-9] [!A-Z]) */
52 static int strcmp_pattern(const char *p, const char *s)
57 return (p[0] != '\0');
68 while ((p[0] != '\0') && (p[0] != ']')) {
71 if ((s[0] >= p[0]) && (s[0] <= p[2]))
75 match = (p[0] == s[0]);
79 while ((p[0] != '\0') && (p[0] != ']'))
82 return strcmp_pattern(p+1, s+1);
88 if (strcmp_pattern(p, s+1))
89 return strcmp_pattern(p+1, s);
97 if ((p[0] == s[0]) || (p[0] == '?'))
98 return strcmp_pattern(p+1, s+1);
104 static struct perm_device *find_perm_entry(const char *name)
106 struct perm_device *perm;
108 list_for_each_entry(perm, &perm_device_list, node) {
109 if (strcmp_pattern(perm->name, name))
116 /* extract possible {attr} and move str behind it */
117 static char *get_format_attribute(char **str)
122 if (*str[0] == '{') {
123 pos = strchr(*str, '}');
125 dbg("missing closing brace for format");
131 dbg("attribute='%s', str='%s'", attr, *str);
136 /* extract possible format length and move str behind it*/
137 static int get_format_len(char **str)
142 if (isdigit(*str[0])) {
143 num = (int) strtoul(*str, &tail, 10);
146 dbg("format length=%i", num);
149 dbg("format parsing error '%s'", *str);
155 /** Finds the lowest positive N such that <name>N isn't present in
156 * $(udevroot) either as a file or a symlink.
158 * @param name Name to check for
159 * @return 0 if <name> didn't exist and N otherwise.
161 static int find_free_number(struct udevice *udev, const char *name)
163 char filename[NAME_SIZE];
165 struct udevice db_udev;
167 strfieldcpy(filename, name);
169 dbg("look for existing node '%s'", filename);
170 memset(&db_udev, 0x00, sizeof(struct udevice));
171 if (udev_db_get_device_byname(&db_udev, filename) != 0) {
172 dbg("free num=%d", num);
178 info("find_free_number gone crazy (num=%d), aborted", num);
181 snprintf(filename, NAME_SIZE, "%s%d", name, num);
182 filename[NAME_SIZE-1] = '\0';
186 static void apply_format(struct udevice *udev, char *string, size_t maxsize,
187 struct sysfs_class_device *class_dev,
188 struct sysfs_device *sysfs_device)
190 char temp[NAME_SIZE];
191 char temp2[NAME_SIZE];
201 struct sysfs_attribute *tmpattr;
202 unsigned int next_free_number;
206 pos = strchr(pos, '%');
212 len = get_format_len(&tail);
214 strfieldcpy(temp, tail+1);
216 dbg("format=%c, string='%s', tail='%s'",c , string, tail);
217 attr = get_format_attribute(&tail);
222 if (strlen(udev->bus_id) == 0)
224 strfieldcatmax(string, udev->bus_id, maxsize);
225 dbg("substitute bus_id '%s'", udev->bus_id);
228 if (strlen(udev->kernel_name) == 0)
230 strfieldcatmax(string, udev->kernel_name, maxsize);
231 dbg("substitute kernel name '%s'", udev->kernel_name);
234 if (strlen(udev->kernel_number) == 0)
236 strfieldcatmax(string, udev->kernel_number, maxsize);
237 dbg("substitute kernel number '%s'", udev->kernel_number);
240 strintcatmax(string, udev->minor, maxsize);
241 dbg("substitute minor number '%u'", udev->minor);
244 strintcatmax(string, udev->major, maxsize);
245 dbg("substitute major number '%u'", udev->major);
248 if (strlen(udev->program_result) == 0)
250 /* get part part of the result string */
253 i = strtoul(attr, &rest, 10);
255 foreach_strpart(udev->program_result, " \n\r", spos, slen) {
261 dbg("requested part of result string not found");
265 strfieldcpy(temp2, spos);
267 strfieldcpymax(temp2, spos, slen+1);
268 strfieldcatmax(string, temp2, maxsize);
269 dbg("substitute part of result string '%s'", temp2);
271 strfieldcatmax(string, udev->program_result, maxsize);
272 dbg("substitute result string '%s'", udev->program_result);
277 tmpattr = find_sysfs_attribute(class_dev, sysfs_device, attr);
278 if (tmpattr == NULL) {
279 dbg("sysfa attribute '%s' not found", attr);
282 /* strip trailing whitespace of matching value */
283 if (isspace(tmpattr->value[strlen(tmpattr->value)-1])) {
284 i = len = strlen(tmpattr->value);
285 while (i > 0 && isspace(tmpattr->value[i-1]))
288 tmpattr->value[i] = '\0';
289 dbg("remove %i trailing whitespace chars from '%s'",
290 len - i, tmpattr->value);
293 strfieldcatmax(string, tmpattr->value, maxsize);
294 dbg("substitute sysfs value '%s'", tmpattr->value);
296 dbg("missing attribute");
300 strfieldcatmax(string, "%", maxsize);
304 next_free_number = find_free_number(udev, string);
305 if (next_free_number > 0) {
306 sprintf(temp2, "%d", next_free_number);
307 strfieldcatmax(string, temp2, maxsize);
311 dbg("unknown substitution type '%%%c'", c);
314 /* truncate to specified length */
318 strfieldcatmax(string, tail, maxsize);
322 static void fix_kernel_name(struct udevice *udev)
324 char *temp = udev->kernel_name;
326 while (*temp != 0x00) {
327 /* Some block devices have a ! in their name,
328 * we need to change that to / */
335 static int execute_program(struct udevice *udev, const char *path, char *value, int len)
343 char arg[PROGRAM_SIZE];
344 char *argv[(PROGRAM_SIZE / 2) + 1];
347 strfieldcpy(arg, path);
349 if (strchr(path, ' ')) {
351 while (pos != NULL) {
352 if (pos[0] == '\'') {
353 /* don't separate if in apostrophes */
355 argv[i] = strsep(&pos, "\'");
356 while (pos && pos[0] == ' ')
359 argv[i] = strsep(&pos, " ");
361 dbg("arg[%i] '%s'", i, argv[i]);
365 dbg("execute '%s' with parsed arguments", arg);
368 argv[1] = udev->subsystem;
370 dbg("execute '%s' with subsystem '%s' argument", arg, argv[1]);
383 /* dup2 write side of pipe to STDOUT */
384 dup2(fds[1], STDOUT_FILENO);
385 retval = execv(arg, argv);
387 info(FIELD_PROGRAM " execution of '%s' failed", path);
393 /* parent reads from fds[0] */
398 count = read(fds[0], value + i, len - i-1);
404 dbg("result len %d too short", len);
411 dbg("read failed with '%s'", strerror(errno));
415 if (i > 0 && value[i-1] == '\n')
418 dbg("result is '%s'", value);
421 waitpid(pid, &status, 0);
423 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
424 dbg("exec program status 0x%x", status);
431 static struct sysfs_attribute *find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, char *attr)
433 struct sysfs_attribute *tmpattr = NULL;
436 dbg("look for device attribute '%s'", attr);
437 /* try to find the attribute in the class device directory */
438 tmpattr = sysfs_get_classdev_attr(class_dev, attr);
442 /* look in the class device directory if present */
444 tmpattr = sysfs_get_device_attr(sysfs_device, attr);
452 c = strchr(tmpattr->value, '\n');
456 dbg("found attribute '%s'", tmpattr->path);
460 static int compare_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, struct sysfs_pair *pair)
462 struct sysfs_attribute *tmpattr;
466 if ((pair == NULL) || (pair->file[0] == '\0') || (pair->value == '\0'))
469 tmpattr = find_sysfs_attribute(class_dev, sysfs_device, pair->file);
473 /* strip trailing whitespace of value, if not asked to match for it */
474 if (! isspace(pair->value[strlen(pair->value)-1])) {
475 i = len = strlen(tmpattr->value);
476 while (i > 0 && isspace(tmpattr->value[i-1]))
479 tmpattr->value[i] = '\0';
480 dbg("remove %i trailing whitespace chars from '%s'",
481 len - i, tmpattr->value);
485 dbg("compare attribute '%s' value '%s' with '%s'",
486 pair->file, tmpattr->value, pair->value);
487 if (strcmp_pattern(pair->value, tmpattr->value) != 0)
490 dbg("found matching attribute '%s' with value '%s'",
491 pair->file, pair->value);
495 static int match_sysfs_pairs(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
497 struct sysfs_pair *pair;
500 for (i = 0; i < MAX_SYSFS_PAIRS; ++i) {
501 pair = &dev->sysfs_pair[i];
502 if ((pair->file[0] == '\0') || (pair->value[0] == '\0'))
504 if (compare_sysfs_attribute(class_dev, sysfs_device, pair) != 0) {
505 dbg("sysfs attribute doesn't match");
513 static int match_id(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
515 char path[SYSFS_PATH_MAX];
518 /* we have to have a sysfs device for ID to work */
522 strfieldcpy(path, sysfs_device->path);
523 temp = strrchr(path, '/');
525 dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
526 if (strcmp_pattern(dev->id, temp) != 0)
532 static int match_place(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
534 char path[SYSFS_PATH_MAX];
538 /* we have to have a sysfs device for PLACE to work */
543 strfieldcpy(path, sysfs_device->path);
544 temp = strrchr(path, '/');
545 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
546 if (strstr(temp, dev->place) != NULL) {
550 temp = strrchr(path, '/');
551 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
552 if (strstr(temp, dev->place) != NULL)
556 dbg("place doesn't match");
563 static int match_rule(struct udevice *udev, struct config_device *dev,
564 struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
567 /* check for matching bus value */
568 if (dev->bus[0] != '\0') {
569 if (sysfs_device == NULL) {
570 dbg("device has no bus");
573 dbg("check for " FIELD_BUS " dev->bus='%s' sysfs_device->bus='%s'",
574 dev->bus, sysfs_device->bus);
575 if (strcmp_pattern(dev->bus, sysfs_device->bus) != 0) {
576 dbg(FIELD_BUS " is not matching");
579 dbg(FIELD_BUS " matches");
583 /* check for matching kernel name */
584 if (dev->kernel[0] != '\0') {
585 dbg("check for " FIELD_KERNEL " dev->kernel='%s' class_dev->name='%s'",
586 dev->kernel, class_dev->name);
587 if (strcmp_pattern(dev->kernel, class_dev->name) != 0) {
588 dbg(FIELD_KERNEL " is not matching");
591 dbg(FIELD_KERNEL " matches");
595 /* check for matching subsystem */
596 if (dev->subsystem[0] != '\0') {
597 dbg("check for " FIELD_SUBSYSTEM " dev->subsystem='%s' class_dev->name='%s'",
598 dev->subsystem, class_dev->name);
599 if (strcmp_pattern(dev->subsystem, udev->subsystem) != 0) {
600 dbg(FIELD_SUBSYSTEM " is not matching");
603 dbg(FIELD_SUBSYSTEM " matches");
607 /* check for matching driver */
608 if (dev->driver[0] != '\0') {
609 dbg("check for " FIELD_DRIVER " dev->driver='%s' sysfs_device->driver_name='%s'",
610 dev->driver, sysfs_device->driver_name);
611 if (strcmp_pattern(dev->driver, sysfs_device->driver_name) != 0) {
612 dbg(FIELD_DRIVER " is not matching");
615 dbg(FIELD_DRIVER " matches");
619 /* check for matching bus id */
620 if (dev->id[0] != '\0') {
621 dbg("check " FIELD_ID);
622 if (match_id(dev, class_dev, sysfs_device) != 0) {
623 dbg(FIELD_ID " is not matching");
626 dbg(FIELD_ID " matches");
630 /* check for matching place of device */
631 if (dev->place[0] != '\0') {
632 dbg("check " FIELD_PLACE);
633 if (match_place(dev, class_dev, sysfs_device) != 0) {
634 dbg(FIELD_PLACE " is not matching");
637 dbg(FIELD_PLACE " matches");
641 /* check for matching sysfs pairs */
642 if (dev->sysfs_pair[0].file[0] != '\0') {
643 dbg("check " FIELD_SYSFS " pairs");
644 if (match_sysfs_pairs(dev, class_dev, sysfs_device) != 0) {
645 dbg(FIELD_SYSFS " is not matching");
648 dbg(FIELD_SYSFS " matches");
652 /* execute external program */
653 if (dev->program[0] != '\0') {
654 char program[PROGRAM_SIZE];
656 dbg("check " FIELD_PROGRAM);
657 strfieldcpy(program, dev->program);
658 apply_format(udev, program, sizeof(program), class_dev, sysfs_device);
659 if (execute_program(udev, program, udev->program_result, NAME_SIZE) != 0) {
660 dbg(FIELD_PROGRAM " returned nonzero");
663 dbg(FIELD_PROGRAM " returned successful");
667 /* check for matching result of external program */
668 if (dev->result[0] != '\0') {
669 dbg("check for " FIELD_RESULT
670 " 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");
680 /* Yeah, we matched! */
684 dbg("try parent sysfs device");
685 sysfs_device = sysfs_get_device_parent(sysfs_device);
686 if (sysfs_device == NULL)
688 dbg("sysfs_device->path='%s'", sysfs_device->path);
689 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
694 int namedev_name_device(struct udevice *udev, struct sysfs_class_device *class_dev)
696 struct sysfs_class_device *class_dev_parent;
697 struct sysfs_device *sysfs_device = NULL;
698 struct config_device *dev;
699 struct perm_device *perm;
704 dbg("class_dev->name='%s'", class_dev->name);
706 /* Figure out where the "device"-symlink is at. For char devices this will
707 * always be in the class_dev->path. On block devices, only the main block
708 * device will have the device symlink in it's path. All partition devices
709 * need to look at the symlink in its parent directory.
711 class_dev_parent = sysfs_get_classdev_parent(class_dev);
712 if (class_dev_parent != NULL) {
713 dbg("given class device has a parent, use this instead");
714 sysfs_device = sysfs_get_classdev_device(class_dev_parent);
716 sysfs_device = sysfs_get_classdev_device(class_dev);
720 dbg("found devices device: path='%s', bus_id='%s', bus='%s'",
721 sysfs_device->path, sysfs_device->bus_id, sysfs_device->bus);
722 strfieldcpy(udev->bus_id, sysfs_device->bus_id);
725 strfieldcpy(udev->kernel_name, class_dev->name);
726 fix_kernel_name(udev);
727 dbg("udev->kernel_name = '%s'", udev->kernel_name);
729 /* get kernel number */
730 pos = class_dev->name + strlen(class_dev->name);
731 while (isdigit(*(pos-1)))
733 strfieldcpy(udev->kernel_number, pos);
734 dbg("kernel_number='%s'", udev->kernel_number);
736 /* look for a matching rule to apply */
737 list_for_each_entry(dev, &config_device_list, node) {
739 if (match_rule(udev, dev, class_dev, sysfs_device) == 0) {
740 /* empty name and symlink will not create any node */
741 if (dev->name[0] == '\0' && dev->symlink[0] == '\0') {
742 info("configured rule in '%s' at line %i applied, '%s' is ignored",
743 dev->config_file, dev->config_line, udev->kernel_name);
747 /* collect symlinks for the final matching rule */
748 if (dev->symlink[0] != '\0') {
749 char temp[NAME_SIZE];
751 info("configured rule in '%s' at line %i applied, added symlink '%s'",
752 dev->config_file, dev->config_line, dev->symlink);
753 strfieldcpy(temp, dev->symlink);
754 apply_format(udev, temp, sizeof(temp), class_dev, sysfs_device);
755 if (udev->symlink[0] != '\0')
756 strfieldcat(udev->symlink, " ");
757 strfieldcat(udev->symlink, temp);
761 if (dev->name[0] != '\0') {
762 /* apply all_partitions flag only at a main block device */
763 if (dev->partitions > 0 &&
764 (udev->type != 'b' || udev->kernel_number[0] != '\0'))
767 info("configured rule in '%s' at line %i applied, '%s' becomes '%s'",
768 dev->config_file, dev->config_line, udev->kernel_name, dev->name);
770 strfieldcpy(udev->name, dev->name);
771 apply_format(udev, udev->name, sizeof(udev->name), class_dev, sysfs_device);
772 strfieldcpy(udev->config_file, dev->config_file);
773 udev->config_line = dev->config_line;
774 udev->ignore_remove = dev->ignore_remove;
776 if (udev->type == 'n')
779 udev->partitions = dev->partitions;
780 udev->mode = dev->mode;
781 strfieldcpy(udev->owner, dev->owner);
782 strfieldcpy(udev->group, dev->group);
789 /* no rule matched, so we use the kernel name */
790 strfieldcpy(udev->name, udev->kernel_name);
792 if (udev->type == 'n')
796 /* apply permissions from permissions file to empty fields */
797 perm = find_perm_entry(udev->name);
799 if (udev->mode == 0000)
800 udev->mode = perm->mode;
801 if (udev->owner[0] == '\0')
802 strfieldcpy(udev->owner, perm->owner);
803 if (udev->group[0] == '\0')
804 strfieldcpy(udev->group, perm->group);
807 /* apply permissions from config to empty fields */
808 if (udev->mode == 0000)
809 udev->mode = default_mode;
810 if (udev->owner[0] == '\0')
811 strfieldcpy(udev->owner, default_owner);
812 if (udev->group[0] == '\0')
813 strfieldcpy(udev->group, default_group);
815 dbg("name, '%s' is going to have owner='%s', group='%s', mode = %#o",
816 udev->name, udev->owner, udev->group, udev->mode);
819 /* store time of action */
821 udev->config_uptime = info.uptime;
826 int namedev_init(void)
830 retval = namedev_init_rules();
834 retval = namedev_init_permissions();
838 dump_config_dev_list();
839 dump_perm_dev_list();