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.
38 #include "udev_version.h"
41 #include "libsysfs/libsysfs.h"
42 #include "klibc_fixups.h"
44 static struct sysfs_attribute *find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, char *attr);
46 LIST_HEAD(config_device_list);
47 LIST_HEAD(perm_device_list);
49 /* compare string with pattern (supports * ? [0-9] [!A-Z]) */
50 static int strcmp_pattern(const char *p, const char *s)
55 return (p[0] != '\0');
66 while ((p[0] != '\0') && (p[0] != ']')) {
69 if ((s[0] >= p[0]) && (s[0] <= p[2]))
73 match = (p[0] == s[0]);
77 while ((p[0] != '\0') && (p[0] != ']'))
80 return strcmp_pattern(p+1, s+1);
86 if (strcmp_pattern(p, s+1))
87 return strcmp_pattern(p+1, s);
95 if ((p[0] == s[0]) || (p[0] == '?'))
96 return strcmp_pattern(p+1, s+1);
102 #define copy_var(a, b, var) \
106 #define copy_string(a, b, var) \
107 if (strlen(b->var)) \
108 strcpy(a->var, b->var);
110 int add_perm_dev(struct perm_device *new_dev)
112 struct perm_device *dev;
113 struct perm_device *tmp_dev;
115 /* update the values if we already have the device */
116 list_for_each_entry(dev, &perm_device_list, node) {
117 if (strcmp(new_dev->name, dev->name))
119 copy_var(dev, new_dev, mode);
120 copy_string(dev, new_dev, owner);
121 copy_string(dev, new_dev, group);
125 /* not found, add new structure to the perm list */
126 tmp_dev = malloc(sizeof(*tmp_dev));
129 memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
130 list_add_tail(&tmp_dev->node, &perm_device_list);
131 //dump_perm_dev(tmp_dev);
135 static struct perm_device *find_perm(char *name)
137 struct perm_device *perm;
139 list_for_each_entry(perm, &perm_device_list, node) {
140 if (strcmp_pattern(perm->name, name))
147 static mode_t get_default_mode(void)
149 mode_t mode = 0600; /* default to owner rw only */
151 if (strlen(default_mode_str) != 0)
152 mode = strtol(default_mode_str, NULL, 8);
157 static char *get_default_owner(void)
159 if (strlen(default_owner_str) == 0)
160 strncpy(default_owner_str, "root", OWNER_SIZE);
162 return default_owner_str;
165 static char *get_default_group(void)
167 if (strlen(default_group_str) == 0)
168 strncpy(default_group_str, "root", GROUP_SIZE);
170 return default_group_str;
173 /* extract possible {attr} and move str behind it */
174 static char *get_format_attribute(char **str)
179 if (*str[0] == '{') {
180 pos = strchr(*str, '}');
182 dbg("missing closing brace for format");
188 dbg("attribute='%s', str='%s'", attr, *str);
193 /* extract possible format length and move str behind it*/
194 static int get_format_len(char **str)
199 if (isdigit(*str[0])) {
200 num = (int) strtoul(*str, &tail, 10);
203 dbg("format length=%i", num);
206 dbg("format parsing error '%s'", *str);
212 static void apply_format(struct udevice *udev, unsigned char *string, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
214 char temp[NAME_SIZE];
215 char temp1[NAME_SIZE];
223 struct sysfs_attribute *tmpattr;
228 pos = strchr(pos, '%');
232 num = get_format_len(&tail);
234 strfieldcpy(temp, tail+1);
239 dbg("format=%c, string='%s', tail='%s'",c , string, tail);
241 attr = get_format_attribute(&tail);
245 if (strlen(udev->bus_id) == 0)
247 strcat(pos, udev->bus_id);
248 dbg("substitute bus_id '%s'", udev->bus_id);
251 if (strlen(udev->kernel_name) == 0)
253 strcat(pos, udev->kernel_name);
254 dbg("substitute kernel name '%s'", udev->kernel_name);
257 if (strlen(udev->kernel_number) == 0)
259 strcat(pos, udev->kernel_number);
260 dbg("substitute kernel number '%s'", udev->kernel_number);
263 sprintf(pos, "%u", udev->minor);
264 dbg("substitute minor number '%u'", udev->minor);
267 sprintf(pos, "%u", udev->major);
268 dbg("substitute major number '%u'", udev->major);
271 if (strlen(udev->program_result) == 0)
274 strncpy(temp1, udev->program_result, sizeof(temp1));
278 pos3 = strsep(&pos2, " ");
280 dbg("requested part of result string not found");
286 dbg("substitute part of result string '%s'", pos3);
289 strcat(pos, udev->program_result);
290 dbg("substitute result string '%s'", udev->program_result);
295 tmpattr = find_sysfs_attribute(class_dev, sysfs_device, attr);
296 if (tmpattr == NULL) {
297 dbg("sysfa attribute '%s' not found", attr);
300 strcpy(pos, tmpattr->value);
301 dbg("substitute sysfs value '%s'", tmpattr->value);
303 dbg("missing attribute");
310 dbg("unknown substitution type '%%%c'", c);
318 * Note, we can have multiple files for different busses in here due
319 * to the mess that USB has for its device tree...
321 static struct bus_file {
325 { .bus = "scsi", .file = "vendor" },
326 { .bus = "usb", .file = "idVendor" },
327 { .bus = "usb", .file = "iInterface" },
328 { .bus = "usb-serial", .file = "detach_state" },
329 { .bus = "ide", .file = "detach_state" },
330 { .bus = "pci", .file = "vendor" },
334 #define SECONDS_TO_WAIT_FOR_FILE 10
335 static void wait_for_device_to_initialize(struct sysfs_device *sysfs_device)
337 /* sleep until we see the file for this specific bus type show up this
338 * is needed because we can easily out-run the kernel in looking for
339 * these files before the paticular subsystem has created them in the
340 * sysfs tree properly.
342 * And people thought that the /sbin/hotplug event system was going to
343 * be slow, poo on you for arguing that before even testing it...
345 struct bus_file *b = &bus_files[0];
346 struct sysfs_attribute *tmpattr;
348 int loop = SECONDS_TO_WAIT_FOR_FILE;
351 if (b->bus == NULL) {
354 /* sleep to give the kernel a chance to create the file */
361 if (strcmp(sysfs_device->bus, b->bus) == 0) {
363 dbg("looking for file '%s' on bus '%s'", b->file, b->bus);
364 tmpattr = sysfs_get_device_attr(sysfs_device, b->file);
369 dbg("can't find '%s' file", b->file);
374 dbg("did not find bus type '%s' on list of bus_id_files, "
375 "contact greg@kroah.com", sysfs_device->bus);
377 return; /* here to prevent compiler warning... */
380 static void fix_kernel_name(struct udevice *udev)
382 char *temp = udev->kernel_name;
384 while (*temp != 0x00) {
385 /* Some block devices have a ! in their name,
386 * we need to change that to / */
393 static int execute_program(char *path, char *value, int len)
403 char *args[PROGRAM_MAXARG];
406 dbg("executing '%s'", path);
416 close(STDOUT_FILENO);
417 dup(fds[1]); /* dup write side of pipe to STDOUT */
418 if (strchr(path, ' ')) {
419 /* exec with arguments */
421 for (i=0; i < PROGRAM_MAXARG-1; i++) {
422 args[i] = strsep(&pos, " ");
427 dbg("too many args - %d", i);
430 retval = execv(args[0], args);
432 retval = execv(path, main_argv);
434 dbg("child execve failed");
440 /* parent reads from fds[0] */
444 res = read(fds[0], buffer, sizeof(buffer) - 1);
449 dbg("result len %d too short", len);
453 dbg("result value already set");
457 strncpy(value, buffer, len);
458 pos = value + strlen(value)-1;
461 dbg("result is '%s'", value);
467 dbg("wait failed result %d", res);
471 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
472 dbg("exec program status 0x%x", status);
479 static struct sysfs_attribute *find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, char *attr)
481 struct sysfs_attribute *tmpattr = NULL;
484 dbg("look for device attribute '%s'", attr);
485 /* try to find the attribute in the class device directory */
486 tmpattr = sysfs_get_classdev_attr(class_dev, attr);
490 /* look in the class device directory if present */
492 tmpattr = sysfs_get_device_attr(sysfs_device, attr);
500 c = strchr(tmpattr->value, '\n');
504 dbg("found attribute '%s'", tmpattr->path);
508 static int compare_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, struct sysfs_pair *pair)
510 struct sysfs_attribute *tmpattr;
512 if ((pair == NULL) || (pair->file[0] == '\0') || (pair->value == '\0'))
515 tmpattr = find_sysfs_attribute(class_dev, sysfs_device, pair->file);
519 dbg("compare attribute '%s' value '%s' with '%s'",
520 pair->file, tmpattr->value, pair->value);
521 if (strcmp_pattern(pair->value, tmpattr->value) != 0)
524 dbg("found matching attribute '%s' with value '%s'",
525 pair->file, pair->value);
529 static int match_sysfs_pairs(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
531 struct sysfs_pair *pair;
534 for (i = 0; i < MAX_SYSFS_PAIRS; ++i) {
535 pair = &dev->sysfs_pair[i];
536 if ((pair->file[0] == '\0') || (pair->value[0] == '\0'))
538 if (compare_sysfs_attribute(class_dev, sysfs_device, pair) != 0) {
539 dbg("sysfs attribute doesn't match");
547 static int match_id(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
549 char path[SYSFS_PATH_MAX];
552 /* we have to have a sysfs device for ID to work */
556 strfieldcpy(path, sysfs_device->path);
557 temp = strrchr(path, '/');
559 dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
560 if (strcmp_pattern(dev->id, temp) != 0)
566 static int match_place(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
568 char path[SYSFS_PATH_MAX];
572 /* we have to have a sysfs device for PLACE to work */
577 strfieldcpy(path, sysfs_device->path);
578 temp = strrchr(path, '/');
579 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
580 if (strstr(temp, dev->place) != NULL) {
584 temp = strrchr(path, '/');
585 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
586 if (strstr(temp, dev->place) != NULL)
590 dbg("place doesn't match");
597 static struct sysfs_device *get_sysfs_device(struct sysfs_class_device *class_dev)
599 struct sysfs_device *sysfs_device;
600 struct sysfs_class_device *class_dev_parent;
601 struct timespec tspec;
604 /* Figure out where the device symlink is at. For char devices this will
605 * always be in the class_dev->path. But for block devices, it's different.
606 * The main block device will have the device symlink in it's path, but
607 * all partitions have the symlink in its parent directory.
608 * But we need to watch out for block devices that do not have parents, yet
609 * look like a partition (fd0, loop0, etc.) They all do not have a device
610 * symlink yet. We do sit and spin on waiting for them right now, we should
611 * possibly have a whitelist for these devices here...
613 class_dev_parent = sysfs_get_classdev_parent(class_dev);
614 if (class_dev_parent)
615 dbg("Really a partition");
618 tspec.tv_nsec = 10000000; /* sleep 10 millisec */
621 nanosleep(&tspec, NULL);
622 if (class_dev_parent)
623 sysfs_device = sysfs_get_classdev_device(class_dev_parent);
625 sysfs_device = sysfs_get_classdev_device(class_dev);
627 if (sysfs_device != NULL)
630 dbg("timed out waiting for device symlink, continuing on anyway...");
633 /* We have another issue with just the wait above - the sysfs part of
634 * the kernel may not be quick enough to have created the link to the
635 * device under the "bus" subsystem. Due to this, the sysfs_device->bus
636 * will not contain the actual bus name :(
638 * Libsysfs now provides a new API sysfs_get_device_bus(), so use it
642 if (sysfs_device->bus[0] != '\0')
646 tspec.tv_nsec = 10000000;
648 nanosleep(&tspec, NULL);
649 sysfs_get_device_bus(sysfs_device);
651 if (sysfs_device->bus[0] != '\0')
654 dbg("timed out waiting to find the device bus, continuing on anyway");
657 dbg("device %s is registered with bus '%s'",
658 sysfs_device->name, sysfs_device->bus);
664 static int match_rule(struct config_device *dev, struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
667 /* check for matching bus value */
668 if (dev->bus[0] != '\0') {
669 if (sysfs_device == NULL) {
670 dbg("device has no bus");
673 dbg("check for " FIELD_BUS " dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
674 if (strcmp_pattern(dev->bus, sysfs_device->bus) != 0) {
675 dbg(FIELD_BUS " is not matching");
678 dbg(FIELD_BUS " matches");
682 /* check for matching kernel name*/
683 if (dev->kernel[0] != '\0') {
684 dbg("check for " FIELD_KERNEL " dev->kernel='%s' class_dev->name='%s'", dev->kernel, class_dev->name);
685 if (strcmp_pattern(dev->kernel, class_dev->name) != 0) {
686 dbg(FIELD_KERNEL " is not matching");
689 dbg(FIELD_KERNEL " matches");
693 /* check for matching bus id */
694 if (dev->id[0] != '\0') {
695 dbg("check " FIELD_ID);
696 if (match_id(dev, class_dev, sysfs_device) != 0) {
697 dbg(FIELD_ID " is not matching");
700 dbg(FIELD_ID " matches");
704 /* check for matching place of device */
705 if (dev->place[0] != '\0') {
706 dbg("check " FIELD_PLACE);
707 if (match_place(dev, class_dev, sysfs_device) != 0) {
708 dbg(FIELD_PLACE " is not matching");
711 dbg(FIELD_PLACE " matches");
715 /* check for matching sysfs pairs */
716 if (dev->sysfs_pair[0].file[0] != '\0') {
717 dbg("check " FIELD_SYSFS " pairs");
718 if (match_sysfs_pairs(dev, class_dev, sysfs_device) != 0) {
719 dbg(FIELD_SYSFS " is not matching");
722 dbg(FIELD_SYSFS " matches");
726 /* execute external program */
727 if (dev->program[0] != '\0') {
728 dbg("check " FIELD_PROGRAM);
729 apply_format(udev, dev->program, class_dev, sysfs_device);
730 if (execute_program(dev->program, udev->program_result, NAME_SIZE) != 0) {
731 dbg(FIELD_PROGRAM " returned nozero");
734 dbg(FIELD_PROGRAM " returned successful");
738 /* check for matching result of external program */
739 if (dev->result[0] != '\0') {
740 dbg("check for " FIELD_RESULT
741 " dev->result='%s', udev->program_result='%s'",
742 dev->result, udev->program_result);
743 if (strcmp_pattern(dev->result, udev->program_result) != 0) {
744 dbg(FIELD_RESULT " is not matching");
747 dbg(FIELD_RESULT " matches");
751 /* Yeah, we matched! */
755 dbg("try parent sysfs device");
756 sysfs_device = sysfs_get_device_parent(sysfs_device);
757 if (sysfs_device == NULL)
759 dbg("sysfs_device->path='%s'", sysfs_device->path);
760 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
761 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
766 int namedev_name_device(struct sysfs_class_device *class_dev, struct udevice *udev)
768 struct sysfs_device *sysfs_device = NULL;
769 struct config_device *dev;
770 struct perm_device *perm;
775 /* find the sysfs_device associated with this class device */
776 sysfs_device = get_sysfs_device(class_dev);
778 dbg("sysfs_device->path='%s'", sysfs_device->path);
779 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
780 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
781 strfieldcpy(udev->bus_id, sysfs_device->bus_id);
782 wait_for_device_to_initialize(sysfs_device);
784 dbg("class_dev->name = '%s'", class_dev->name);
786 strfieldcpy(udev->kernel_name, class_dev->name);
787 fix_kernel_name(udev);
788 dbg("udev->kernel_name = '%s'", udev->kernel_name);
790 /* get kernel number */
791 pos = class_dev->name + strlen(class_dev->name);
792 while (isdigit(*(pos-1)))
794 strfieldcpy(udev->kernel_number, pos);
795 dbg("kernel_number='%s'", udev->kernel_number);
797 /* look for a matching rule to apply */
798 list_for_each_entry(dev, &config_device_list, node) {
800 if (match_rule(dev, class_dev, udev, sysfs_device) == 0) {
801 if (dev->name[0] == '\0') {
802 info("configured rule in '%s' at line %i applied, '%s' is ignored",
803 udev_rules_filename, dev->config_line, udev->kernel_name);
807 info("configured rule in '%s' at line %i applied, '%s' becomes '%s'",
808 udev_rules_filename, dev->config_line, udev->kernel_name, dev->name);
809 strfieldcpy(udev->name, dev->name);
810 strfieldcpy(udev->symlink, dev->symlink);
815 /* no rule was found so we use the kernel name */
816 strfieldcpy(udev->name, udev->kernel_name);
820 /* substitute placeholder */
821 apply_format(udev, udev->name, class_dev, sysfs_device);
822 apply_format(udev, udev->symlink, class_dev, sysfs_device);
823 udev->partitions = dev->partitions;
825 perm = find_perm(udev->name);
827 udev->mode = perm->mode;
828 strfieldcpy(udev->owner, perm->owner);
829 strfieldcpy(udev->group, perm->group);
831 /* no matching perms found :( */
832 udev->mode = get_default_mode();
833 strncpy(udev->owner, get_default_owner(), OWNER_SIZE);
834 strncpy(udev->group, get_default_group(), GROUP_SIZE);
836 dbg("name, '%s' is going to have owner='%s', group='%s', mode = %#o",
837 udev->name, udev->owner, udev->group, udev->mode);
842 int namedev_init(void)
846 retval = namedev_init_rules();
850 retval = namedev_init_permissions();
854 dump_config_dev_list();
855 dump_perm_dev_list();