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.
36 #include <sys/sysinfo.h>
39 #include "libsysfs/sysfs/libsysfs.h"
43 #include "udev_version.h"
46 #include "klibc_fixups.h"
48 static struct sysfs_attribute *find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, char *attr);
50 LIST_HEAD(config_device_list);
51 LIST_HEAD(perm_device_list);
54 /* compare string with pattern (supports * ? [0-9] [!A-Z]) */
55 static int strcmp_pattern(const char *p, const char *s)
60 return (p[0] != '\0');
71 while ((p[0] != '\0') && (p[0] != ']')) {
74 if ((s[0] >= p[0]) && (s[0] <= p[2]))
78 match = (p[0] == s[0]);
82 while ((p[0] != '\0') && (p[0] != ']'))
85 return strcmp_pattern(p+1, s+1);
91 if (strcmp_pattern(p, s+1))
92 return strcmp_pattern(p+1, s);
100 if ((p[0] == s[0]) || (p[0] == '?'))
101 return strcmp_pattern(p+1, s+1);
107 static struct perm_device *find_perm(char *name)
109 struct perm_device *perm;
111 list_for_each_entry(perm, &perm_device_list, node) {
112 if (strcmp_pattern(perm->name, name))
119 static mode_t get_default_mode(void)
121 mode_t mode = 0600; /* default to owner rw only */
123 if (strlen(default_mode_str) != 0)
124 mode = strtol(default_mode_str, NULL, 8);
129 static char *get_default_owner(void)
131 if (strlen(default_owner_str) == 0)
132 strfieldcpy(default_owner_str, "root");
134 return default_owner_str;
137 static char *get_default_group(void)
139 if (strlen(default_group_str) == 0)
140 strfieldcpy(default_group_str, "root");
142 return default_group_str;
145 /* extract possible {attr} and move str behind it */
146 static char *get_format_attribute(char **str)
151 if (*str[0] == '{') {
152 pos = strchr(*str, '}');
154 dbg("missing closing brace for format");
160 dbg("attribute='%s', str='%s'", attr, *str);
165 /* extract possible format length and move str behind it*/
166 static int get_format_len(char **str)
171 if (isdigit(*str[0])) {
172 num = (int) strtoul(*str, &tail, 10);
175 dbg("format length=%i", num);
178 dbg("format parsing error '%s'", *str);
184 static void apply_format(struct udevice *udev, char *string, size_t maxsize,
185 struct sysfs_class_device *class_dev,
186 struct sysfs_device *sysfs_device)
188 char temp[NAME_SIZE];
189 char temp2[NAME_SIZE];
199 struct sysfs_attribute *tmpattr;
203 pos = strchr(pos, '%');
209 len = get_format_len(&tail);
211 strfieldcpy(temp, tail+1);
213 dbg("format=%c, string='%s', tail='%s'",c , string, tail);
214 attr = get_format_attribute(&tail);
219 if (strlen(udev->bus_id) == 0)
221 strfieldcatmax(string, udev->bus_id, maxsize);
222 dbg("substitute bus_id '%s'", udev->bus_id);
225 if (strlen(udev->kernel_name) == 0)
227 strfieldcatmax(string, udev->kernel_name, maxsize);
228 dbg("substitute kernel name '%s'", udev->kernel_name);
231 if (strlen(udev->kernel_number) == 0)
233 strfieldcatmax(string, udev->kernel_number, maxsize);
234 dbg("substitute kernel number '%s'", udev->kernel_number);
237 strintcatmax(string, udev->minor, maxsize);
238 dbg("substitute minor number '%u'", udev->minor);
241 strintcatmax(string, udev->major, maxsize);
242 dbg("substitute major number '%u'", udev->major);
245 if (strlen(udev->program_result) == 0)
247 /* get part part of the result string */
250 i = strtoul(attr, &rest, 10);
252 foreach_strpart(udev->program_result, " \n\r", spos, slen) {
258 dbg("requested part of result string not found");
262 strfieldcpy(temp2, spos);
264 strfieldcpymax(temp2, spos, slen+1);
265 strfieldcatmax(string, temp2, maxsize);
266 dbg("substitute part of result string '%s'", temp2);
268 strfieldcatmax(string, udev->program_result, maxsize);
269 dbg("substitute result string '%s'", udev->program_result);
274 tmpattr = find_sysfs_attribute(class_dev, sysfs_device, attr);
275 if (tmpattr == NULL) {
276 dbg("sysfa attribute '%s' not found", attr);
279 strfieldcatmax(string, tmpattr->value, maxsize);
280 dbg("substitute sysfs value '%s'", tmpattr->value);
282 dbg("missing attribute");
286 strfieldcatmax(string, "%", maxsize);
290 dbg("unknown substitution type '%%%c'", c);
293 /* truncate to specified length */
297 strfieldcatmax(string, tail, maxsize);
302 * Note, we can have multiple files for different busses in here due
303 * to the mess that USB has for its device tree...
305 static struct bus_file {
309 { .bus = "scsi", .file = "vendor" },
310 { .bus = "usb", .file = "idVendor" },
311 { .bus = "usb", .file = "iInterface" },
312 { .bus = "usb-serial", .file = "detach_state" },
313 { .bus = "ide", .file = "detach_state" },
314 { .bus = "pci", .file = "vendor" },
318 #define SECONDS_TO_WAIT_FOR_FILE 10
319 static void wait_for_device_to_initialize(struct sysfs_device *sysfs_device)
321 /* sleep until we see the file for this specific bus type show up this
322 * is needed because we can easily out-run the kernel in looking for
323 * these files before the paticular subsystem has created them in the
324 * sysfs tree properly.
326 * And people thought that the /sbin/hotplug event system was going to
327 * be slow, poo on you for arguing that before even testing it...
329 struct bus_file *b = &bus_files[0];
330 struct sysfs_attribute *tmpattr;
332 int loop = SECONDS_TO_WAIT_FOR_FILE;
335 if (b->bus == NULL) {
338 /* sleep to give the kernel a chance to create the file */
345 if (strcmp(sysfs_device->bus, b->bus) == 0) {
347 dbg("looking for file '%s' on bus '%s'", b->file, b->bus);
348 tmpattr = sysfs_get_device_attr(sysfs_device, b->file);
353 dbg("can't find '%s' file", b->file);
358 dbg("did not find bus type '%s' on list of bus_id_files, "
359 "contact greg@kroah.com", sysfs_device->bus);
361 return; /* here to prevent compiler warning... */
364 static void fix_kernel_name(struct udevice *udev)
366 char *temp = udev->kernel_name;
368 while (*temp != 0x00) {
369 /* Some block devices have a ! in their name,
370 * we need to change that to / */
377 static int execute_program(char *path, char *value, int len)
385 char arg[PROGRAM_SIZE];
386 char *argv[sizeof(arg) / 2];
390 if (strchr(path, ' ')) {
391 strfieldcpy(arg, path);
393 while (pos != NULL) {
394 if (pos[0] == '\'') {
395 /* don't separate if in apostrophes */
397 argv[i] = strsep(&pos, "\'");
398 while (pos[0] == ' ')
401 argv[i] = strsep(&pos, " ");
403 dbg("arg[%i] '%s'", i, argv[i]);
419 close(STDOUT_FILENO);
421 /* dup write side of pipe to STDOUT */
423 if (argv[0] != NULL) {
424 dbg("execute '%s' with given arguments", argv[0]);
425 retval = execv(argv[0], argv);
427 dbg("execute '%s' with main argument", path);
428 retval = execv(path, main_argv);
431 info(FIELD_PROGRAM " execution of '%s' failed", path);
437 /* parent reads from fds[0] */
442 count = read(fds[0], value + i, len - i-1);
448 dbg("result len %d too short", len);
455 dbg("read failed with '%s'", strerror(errno));
459 if (i > 0 && value[i-1] == '\n')
462 dbg("result is '%s'", value);
467 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
468 dbg("exec program status 0x%x", status);
475 static struct sysfs_attribute *find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, char *attr)
477 struct sysfs_attribute *tmpattr = NULL;
480 dbg("look for device attribute '%s'", attr);
481 /* try to find the attribute in the class device directory */
482 tmpattr = sysfs_get_classdev_attr(class_dev, attr);
486 /* look in the class device directory if present */
488 tmpattr = sysfs_get_device_attr(sysfs_device, attr);
496 c = strchr(tmpattr->value, '\n');
500 dbg("found attribute '%s'", tmpattr->path);
504 static int compare_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, struct sysfs_pair *pair)
506 struct sysfs_attribute *tmpattr;
510 if ((pair == NULL) || (pair->file[0] == '\0') || (pair->value == '\0'))
513 tmpattr = find_sysfs_attribute(class_dev, sysfs_device, pair->file);
517 /* strip trailing whitespace of value, if not asked to match for it */
518 if (! isspace(pair->value[strlen(pair->value)-1])) {
519 i = len = strlen(tmpattr->value);
520 while (i > 0 && isspace(tmpattr->value[i-1]))
523 tmpattr->value[i] = '\0';
524 dbg("remove %i trailing whitespace chars from '%s'",
525 len - i, tmpattr->value);
529 dbg("compare attribute '%s' value '%s' with '%s'",
530 pair->file, tmpattr->value, pair->value);
531 if (strcmp_pattern(pair->value, tmpattr->value) != 0)
534 dbg("found matching attribute '%s' with value '%s'",
535 pair->file, pair->value);
539 static int match_sysfs_pairs(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
541 struct sysfs_pair *pair;
544 for (i = 0; i < MAX_SYSFS_PAIRS; ++i) {
545 pair = &dev->sysfs_pair[i];
546 if ((pair->file[0] == '\0') || (pair->value[0] == '\0'))
548 if (compare_sysfs_attribute(class_dev, sysfs_device, pair) != 0) {
549 dbg("sysfs attribute doesn't match");
557 static int match_id(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
559 char path[SYSFS_PATH_MAX];
562 /* we have to have a sysfs device for ID to work */
566 strfieldcpy(path, sysfs_device->path);
567 temp = strrchr(path, '/');
569 dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
570 if (strcmp_pattern(dev->id, temp) != 0)
576 static int match_place(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
578 char path[SYSFS_PATH_MAX];
582 /* we have to have a sysfs device for PLACE to work */
587 strfieldcpy(path, sysfs_device->path);
588 temp = strrchr(path, '/');
589 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
590 if (strstr(temp, dev->place) != NULL) {
594 temp = strrchr(path, '/');
595 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
596 if (strstr(temp, dev->place) != NULL)
600 dbg("place doesn't match");
607 static struct sysfs_device *get_sysfs_device(struct sysfs_class_device *class_dev)
609 struct sysfs_device *sysfs_device;
610 struct sysfs_class_device *class_dev_parent;
611 struct timespec tspec;
614 /* Figure out where the device symlink is at. For char devices this will
615 * always be in the class_dev->path. But for block devices, it's different.
616 * The main block device will have the device symlink in it's path, but
617 * all partitions have the symlink in its parent directory.
618 * But we need to watch out for block devices that do not have parents, yet
619 * look like a partition (fd0, loop0, etc.) They all do not have a device
620 * symlink yet. We do sit and spin on waiting for them right now, we should
621 * possibly have a whitelist for these devices here...
623 class_dev_parent = sysfs_get_classdev_parent(class_dev);
624 if (class_dev_parent != NULL)
625 dbg("given class device has a parent, use this instead");
628 tspec.tv_nsec = 10000000; /* sleep 10 millisec */
632 nanosleep(&tspec, NULL);
634 if (class_dev_parent)
635 sysfs_device = sysfs_get_classdev_device(class_dev_parent);
637 sysfs_device = sysfs_get_classdev_device(class_dev);
638 if (sysfs_device != NULL)
641 dbg("timed out waiting for device symlink, continuing on anyway...");
644 /* We have another issue with just the wait above - the sysfs part of
645 * the kernel may not be quick enough to have created the link to the
646 * device under the "bus" subsystem. Due to this, the sysfs_device->bus
647 * will not contain the actual bus name :(
650 if (sysfs_device->bus[0] != '\0')
654 tspec.tv_nsec = 10000000;
657 nanosleep(&tspec, NULL);
658 sysfs_get_device_bus(sysfs_device);
660 if (sysfs_device->bus[0] != '\0')
663 dbg("timed out waiting to find the device bus, continuing on anyway");
666 dbg("device %s is registered with bus '%s'",
667 sysfs_device->name, sysfs_device->bus);
673 static int match_rule(struct config_device *dev, struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
676 /* check for matching bus value */
677 if (dev->bus[0] != '\0') {
678 if (sysfs_device == NULL) {
679 dbg("device has no bus");
682 dbg("check for " FIELD_BUS " dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
683 if (strcmp_pattern(dev->bus, sysfs_device->bus) != 0) {
684 dbg(FIELD_BUS " is not matching");
687 dbg(FIELD_BUS " matches");
691 /* check for matching kernel name*/
692 if (dev->kernel[0] != '\0') {
693 dbg("check for " FIELD_KERNEL " dev->kernel='%s' class_dev->name='%s'", dev->kernel, class_dev->name);
694 if (strcmp_pattern(dev->kernel, class_dev->name) != 0) {
695 dbg(FIELD_KERNEL " is not matching");
698 dbg(FIELD_KERNEL " matches");
702 /* check for matching bus id */
703 if (dev->id[0] != '\0') {
704 dbg("check " FIELD_ID);
705 if (match_id(dev, class_dev, sysfs_device) != 0) {
706 dbg(FIELD_ID " is not matching");
709 dbg(FIELD_ID " matches");
713 /* check for matching place of device */
714 if (dev->place[0] != '\0') {
715 dbg("check " FIELD_PLACE);
716 if (match_place(dev, class_dev, sysfs_device) != 0) {
717 dbg(FIELD_PLACE " is not matching");
720 dbg(FIELD_PLACE " matches");
724 /* check for matching sysfs pairs */
725 if (dev->sysfs_pair[0].file[0] != '\0') {
726 dbg("check " FIELD_SYSFS " pairs");
727 if (match_sysfs_pairs(dev, class_dev, sysfs_device) != 0) {
728 dbg(FIELD_SYSFS " is not matching");
731 dbg(FIELD_SYSFS " matches");
735 /* execute external program */
736 if (dev->program[0] != '\0') {
737 dbg("check " FIELD_PROGRAM);
738 apply_format(udev, dev->program, sizeof(dev->program),
739 class_dev, sysfs_device);
740 if (execute_program(dev->program, udev->program_result, NAME_SIZE) != 0) {
741 dbg(FIELD_PROGRAM " returned nonzero");
744 dbg(FIELD_PROGRAM " returned successful");
748 /* check for matching result of external program */
749 if (dev->result[0] != '\0') {
750 dbg("check for " FIELD_RESULT
751 " dev->result='%s', udev->program_result='%s'",
752 dev->result, udev->program_result);
753 if (strcmp_pattern(dev->result, udev->program_result) != 0) {
754 dbg(FIELD_RESULT " is not matching");
757 dbg(FIELD_RESULT " matches");
761 /* Yeah, we matched! */
765 dbg("try parent sysfs device");
766 sysfs_device = sysfs_get_device_parent(sysfs_device);
767 if (sysfs_device == NULL)
769 dbg("sysfs_device->path='%s'", sysfs_device->path);
770 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
771 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
776 int namedev_name_device(struct sysfs_class_device *class_dev, struct udevice *udev)
778 struct sysfs_device *sysfs_device = NULL;
779 struct config_device *dev;
780 struct perm_device *perm;
786 /* find the sysfs_device associated with this class device */
787 sysfs_device = get_sysfs_device(class_dev);
789 dbg("sysfs_device->path='%s'", sysfs_device->path);
790 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
791 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
792 strfieldcpy(udev->bus_id, sysfs_device->bus_id);
793 wait_for_device_to_initialize(sysfs_device);
795 dbg("class_dev->name = '%s'", class_dev->name);
797 strfieldcpy(udev->kernel_name, class_dev->name);
798 fix_kernel_name(udev);
799 dbg("udev->kernel_name = '%s'", udev->kernel_name);
801 /* get kernel number */
802 pos = class_dev->name + strlen(class_dev->name);
803 while (isdigit(*(pos-1)))
805 strfieldcpy(udev->kernel_number, pos);
806 dbg("kernel_number='%s'", udev->kernel_number);
808 /* look for a matching rule to apply */
809 list_for_each_entry(dev, &config_device_list, node) {
811 if (match_rule(dev, class_dev, udev, sysfs_device) == 0) {
812 if (dev->name[0] == '\0' && dev->symlink[0] == '\0') {
813 info("configured rule in '%s' at line %i applied, '%s' is ignored",
814 dev->config_file, dev->config_line, udev->kernel_name);
818 if (dev->symlink[0] != '\0') {
819 char temp[NAME_SIZE];
821 info("configured rule in '%s' at line %i applied, added symlink '%s'",
822 dev->config_file, dev->config_line, dev->symlink);
823 strfieldcpy(temp, dev->symlink);
824 apply_format(udev, temp, sizeof(temp), class_dev, sysfs_device);
825 if (udev->symlink[0] != '\0')
826 strfieldcat(udev->symlink, " ");
827 strfieldcat(udev->symlink, temp);
830 if (dev->name[0] != '\0') {
831 /* apply all_partitions flag only at a main block device */
832 if (dev->partitions > 0 &&
833 (udev->type != 'b' || udev->kernel_number[0] != '\0'))
836 info("configured rule in '%s' at line %i applied, '%s' becomes '%s'",
837 dev->config_file, dev->config_line, udev->kernel_name, dev->name);
838 strfieldcpy(udev->name, dev->name);
843 /* no rule was found so we use the kernel name */
844 strfieldcpy(udev->name, udev->kernel_name);
845 if (udev->type == 'n')
851 apply_format(udev, udev->name, sizeof(udev->name), class_dev, sysfs_device);
852 strfieldcpy(udev->config_file, dev->config_file);
853 udev->config_line = dev->config_line;
855 if (udev->type == 'n')
858 udev->partitions = dev->partitions;
860 /* get permissions given in rule */
861 set_empty_perms(udev, dev->mode,
866 /* get permissions given in config file or set defaults */
867 perm = find_perm(udev->name);
869 set_empty_perms(udev, perm->mode,
873 set_empty_perms(udev, get_default_mode(),
875 get_default_group());
878 dbg("name, '%s' is going to have owner='%s', group='%s', mode = %#o",
879 udev->name, udev->owner, udev->group, udev->mode);
882 /* store time of action */
884 udev->config_uptime = info.uptime;
889 int namedev_init(void)
893 retval = namedev_init_rules();
897 retval = namedev_init_permissions();
901 dump_config_dev_list();
902 dump_perm_dev_list();