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 LIST_HEAD(config_device_list);
45 LIST_HEAD(perm_device_list);
47 /* compare string with pattern (supports * ? [0-9] [!A-Z]) */
48 static int strcmp_pattern(const char *p, const char *s)
64 while (*p && (*p != ']')) {
67 if ((*s >= *p) && (*s <= p[2]))
75 while (*p && (*p != ']'))
77 return strcmp_pattern(p+1, s+1);
83 if (strcmp_pattern(p, s+1))
84 return strcmp_pattern(p+1, s);
92 if ((*p == *s) || (*p == '?'))
93 return strcmp_pattern(p+1, s+1);
99 #define copy_var(a, b, var) \
103 #define copy_string(a, b, var) \
104 if (strlen(b->var)) \
105 strcpy(a->var, b->var);
107 int add_perm_dev(struct perm_device *new_dev)
109 struct perm_device *dev;
110 struct perm_device *tmp_dev;
112 /* update the values if we already have the device */
113 list_for_each_entry(dev, &perm_device_list, node) {
114 if (strcmp_pattern(new_dev->name, dev->name))
116 copy_var(dev, new_dev, mode);
117 copy_string(dev, new_dev, owner);
118 copy_string(dev, new_dev, group);
122 /* not found, add new structure to the perm list */
123 tmp_dev = malloc(sizeof(*tmp_dev));
126 memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
127 list_add_tail(&tmp_dev->node, &perm_device_list);
128 //dump_perm_dev(tmp_dev);
132 static struct perm_device *find_perm(char *name)
134 struct perm_device *perm;
136 list_for_each_entry(perm, &perm_device_list, node) {
137 if (strcmp_pattern(perm->name, name))
144 static mode_t get_default_mode(void)
146 mode_t mode = 0600; /* default to owner rw only */
148 if (strlen(default_mode_str) != 0)
149 mode = strtol(default_mode_str, NULL, 8);
154 static char *get_default_owner(void)
156 if (strlen(default_owner_str) == 0)
157 strncpy(default_owner_str, "root", OWNER_SIZE);
159 return default_owner_str;
162 static char *get_default_group(void)
164 if (strlen(default_group_str) == 0)
165 strncpy(default_group_str, "root", GROUP_SIZE);
167 return default_group_str;
170 static void apply_format(struct udevice *udev, unsigned char *string)
172 char temp[NAME_SIZE];
173 char temp1[NAME_SIZE];
183 pos = strchr(pos, '%');
188 if (isdigit(tail[0])) {
189 num = (int) strtoul(&pos[1], &tail, 10);
191 dbg("format parsing error '%s'", pos+1);
195 strfieldcpy(temp, tail+1);
199 if (strlen(udev->bus_id) == 0)
201 strcat(pos, udev->bus_id);
202 dbg("substitute bus_id '%s'", udev->bus_id);
205 if (strlen(udev->kernel_name) == 0)
207 strcat(pos, udev->kernel_name);
208 dbg("substitute kernel name '%s'", udev->kernel_name);
211 if (strlen(udev->kernel_number) == 0)
213 strcat(pos, udev->kernel_number);
214 dbg("substitute kernel number '%s'", udev->kernel_number);
217 sprintf(pos, "%u", udev->minor);
218 dbg("substitute minor number '%u'", udev->minor);
221 sprintf(pos, "%u", udev->major);
222 dbg("substitute major number '%u'", udev->major);
225 if (strlen(udev->program_result) == 0)
228 /* get part of return string */
229 strncpy(temp1, udev->program_result, sizeof(temp1));
233 pos3 = strsep(&pos2, " ");
235 dbg("requested part of result string not found");
241 dbg("substitute part of result string '%s'", pos3);
244 strcat(pos, udev->program_result);
245 dbg("substitute result string '%s'", udev->program_result);
253 dbg("unknown substitution type '%%%c'", pos[1]);
256 strcat(string, temp);
262 static struct bus_file {
266 { .bus = "scsi", .file = "vendor" },
267 { .bus = "usb", .file = "idVendor" },
268 { .bus = "usb-serial", .file = "detach_state" },
269 { .bus = "ide", .file = "detach_state" },
270 { .bus = "pci", .file = "vendor" },
274 #define SECONDS_TO_WAIT_FOR_FILE 10
275 static void wait_for_device_to_initialize(struct sysfs_device *sysfs_device)
277 /* sleep until we see the file for this specific bus type show up this
278 * is needed because we can easily out-run the kernel in looking for
279 * these files before the paticular subsystem has created them in the
280 * sysfs tree properly.
282 * And people thought that the /sbin/hotplug event system was going to
283 * be slow, poo on you for arguing that before even testing it...
285 struct bus_file *b = &bus_files[0];
286 struct sysfs_attribute *tmpattr;
292 if (strcmp(sysfs_device->bus, b->bus) == 0) {
294 loop = SECONDS_TO_WAIT_FOR_FILE;
296 dbg("looking for file '%s' on bus '%s'", b->file, b->bus);
297 tmpattr = sysfs_get_device_attr(sysfs_device, b->file);
302 /* sleep to give the kernel a chance to create the file */
305 dbg("timed out waiting for '%s' file, continuing on anyway...", b->file);
310 dbg("did not find bus type '%s' on list of bus_id_files, contact greg@kroah.com", sysfs_device->bus);
312 return; /* here to prevent compiler warning... */
315 static int execute_program(char *path, char *value, int len)
325 char *args[PROGRAM_MAXARG];
328 dbg("executing '%s'", path);
342 close(STDOUT_FILENO);
343 dup(fds[1]); /* dup write side of pipe to STDOUT */
344 if (strchr(path, ' ')) {
345 /* exec with arguments */
347 for (i=0; i < PROGRAM_MAXARG-1; i++) {
348 args[i] = strsep(&pos, " ");
353 dbg("too many args - %d", i);
356 retval = execve(args[0], args, main_envp);
358 retval = execve(path, main_argv, main_envp);
361 dbg("child execve failed");
364 return -1; /* avoid compiler warning */
366 /* parent reads from fds[0] */
370 res = read(fds[0], buffer, sizeof(buffer) - 1);
375 dbg("result len %d too short", len);
379 dbg("result value already set");
383 strncpy(value, buffer, len);
384 pos = value + strlen(value)-1;
387 dbg("result is '%s'", value);
393 dbg("wait failed result %d", res);
397 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
398 dbg("exec program status 0x%x", status);
405 static int compare_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, struct sysfs_pair *pair)
407 struct sysfs_attribute *tmpattr = NULL;
410 if ((pair == NULL) || (pair->file[0] == '\0') || (pair->value == '\0'))
413 dbg("look for device attribute '%s'", pair->file);
414 /* try to find the attribute in the class device directory */
415 tmpattr = sysfs_get_classdev_attr(class_dev, pair->file);
419 /* look in the class device directory if present */
421 tmpattr = sysfs_get_device_attr(sysfs_device, pair->file);
428 c = tmpattr->value + strlen(tmpattr->value)-1;
431 dbg("compare attribute '%s' value '%s' with '%s'",
432 pair->file, tmpattr->value, pair->value);
433 if (strcmp_pattern(pair->value, tmpattr->value) != 0)
436 dbg("found matching attribute '%s' with value '%s'",
437 pair->file, pair->value);
441 static int match_sysfs_pairs(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
443 struct sysfs_pair *pair;
446 for (i = 0; i < MAX_SYSFS_PAIRS; ++i) {
447 pair = &dev->sysfs_pair[i];
448 if ((pair->file[0] == '\0') || (pair->value[0] == '\0'))
450 if (compare_sysfs_attribute(class_dev, sysfs_device, pair) != 0) {
451 dbg("sysfs attribute doesn't match");
459 static int match_id(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
461 char path[SYSFS_PATH_MAX];
465 /* we have to have a sysfs device for ID to work */
470 strfieldcpy(path, sysfs_device->path);
471 temp = strrchr(path, '/');
472 dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
473 if (strstr(temp, dev->id) != NULL) {
477 temp = strrchr(path, '/');
478 dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
479 if (strstr(temp, dev->id) != NULL)
483 dbg("id doesn't match");
490 static int match_place(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
492 char path[SYSFS_PATH_MAX];
496 /* we have to have a sysfs device for PLACE to work */
501 strfieldcpy(path, sysfs_device->path);
502 temp = strrchr(path, '/');
503 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
504 if (strstr(temp, dev->place) != NULL) {
508 temp = strrchr(path, '/');
509 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
510 if (strstr(temp, dev->place) != NULL)
514 dbg("place doesn't match");
521 static struct sysfs_device *get_sysfs_device(struct sysfs_class_device *class_dev)
523 struct sysfs_device *sysfs_device;
524 struct sysfs_class_device *class_dev_parent;
525 struct timespec tspec;
528 /* Figure out where the device symlink is at. For char devices this will
529 * always be in the class_dev->path. But for block devices, it's different.
530 * The main block device will have the device symlink in it's path, but
531 * all partitions have the symlink in its parent directory.
532 * But we need to watch out for block devices that do not have parents, yet
533 * look like a partition (fd0, loop0, etc.) They all do not have a device
534 * symlink yet. We do sit and spin on waiting for them right now, we should
535 * possibly have a whitelist for these devices here...
537 class_dev_parent = sysfs_get_classdev_parent(class_dev);
538 if (class_dev_parent)
539 dbg("Really a partition");
542 tspec.tv_nsec = 10000000; /* sleep 10 millisec */
545 nanosleep(&tspec, NULL);
546 if (class_dev_parent)
547 sysfs_device = sysfs_get_classdev_device(class_dev_parent);
549 sysfs_device = sysfs_get_classdev_device(class_dev);
551 if (sysfs_device != NULL)
554 dbg("timed out waiting for device symlink, continuing on anyway...");
557 /* We have another issue with just the wait above - the sysfs part of
558 * the kernel may not be quick enough to have created the link to the
559 * device under the "bus" subsystem. Due to this, the sysfs_device->bus
560 * will not contain the actual bus name :(
562 * Libsysfs now provides a new API sysfs_get_device_bus(), so use it
566 if (sysfs_device->bus[0] != '\0')
570 tspec.tv_nsec = 10000000;
572 nanosleep(&tspec, NULL);
573 sysfs_get_device_bus(sysfs_device);
575 if (sysfs_device->bus[0] != '\0')
578 dbg("timed out waiting to find the device bus, continuing on anyway");
581 dbg("device %s is registered with bus '%s'",
582 sysfs_device->name, sysfs_device->bus);
588 int namedev_name_device(struct sysfs_class_device *class_dev, struct udevice *udev)
590 struct sysfs_device *sysfs_device = NULL;
591 struct config_device *dev;
592 struct perm_device *perm;
597 /* find the sysfs_device associated with this class device */
598 sysfs_device = get_sysfs_device(class_dev);
600 dbg("sysfs_device->path='%s'", sysfs_device->path);
601 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
602 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
603 strfieldcpy(udev->bus_id, sysfs_device->bus_id);
604 wait_for_device_to_initialize(sysfs_device);
606 dbg("class_dev->name = '%s'", class_dev->name);
609 strfieldcpy(udev->kernel_name, class_dev->name);
611 /* get kernel number */
612 pos = class_dev->name + strlen(class_dev->name);
613 while (isdigit(*(pos-1)))
615 strfieldcpy(udev->kernel_number, pos);
616 dbg("kernel_number='%s'", udev->kernel_number);
618 /* look for a matching rule to apply */
619 list_for_each_entry(dev, &config_device_list, node) {
622 /* check for matching bus value */
623 if (dev->bus[0] != '\0') {
624 if (sysfs_device == NULL) {
625 dbg("device has no bus");
628 dbg("check for " FIELD_BUS " dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
629 if (strcmp_pattern(dev->bus, sysfs_device->bus) != 0) {
630 dbg(FIELD_BUS " is not matching");
633 dbg(FIELD_BUS " matches");
637 /* check for matching kernel name*/
638 if (dev->kernel[0] != '\0') {
639 dbg("check for " FIELD_KERNEL " dev->kernel='%s' class_dev->name='%s'", dev->kernel, class_dev->name);
640 if (strcmp_pattern(dev->kernel, class_dev->name) != 0) {
641 dbg(FIELD_KERNEL " is not matching");
644 dbg(FIELD_KERNEL " matches");
648 /* check for matching bus id */
649 if (dev->id[0] != '\0') {
650 dbg("check " FIELD_ID);
651 if (match_id(dev, class_dev, sysfs_device) != 0) {
652 dbg(FIELD_ID " is not matching");
655 dbg(FIELD_ID " matches");
659 /* check for matching place of device */
660 if (dev->place[0] != '\0') {
661 dbg("check " FIELD_PLACE);
662 if (match_place(dev, class_dev, sysfs_device) != 0) {
663 dbg(FIELD_PLACE " is not matching");
666 dbg(FIELD_PLACE " matches");
670 /* check for matching sysfs pairs */
671 if (dev->sysfs_pair[0].file[0] != '\0') {
672 dbg("check " FIELD_SYSFS " pairs");
673 if (match_sysfs_pairs(dev, class_dev, sysfs_device) != 0) {
674 dbg(FIELD_SYSFS " is not matching");
677 dbg(FIELD_SYSFS " matches");
681 /* execute external program */
682 if (dev->program[0] != '\0') {
683 dbg("check " FIELD_PROGRAM);
684 apply_format(udev, dev->program);
685 if (execute_program(dev->program, udev->program_result, NAME_SIZE) != 0) {
686 dbg(FIELD_PROGRAM " returned nozero");
689 dbg(FIELD_PROGRAM " returned successful");
693 /* check for matching result of external program */
694 if (dev->result[0] != '\0') {
695 dbg("check for " FIELD_RESULT
696 " dev->result='%s', udev->program_result='%s'",
697 dev->result, udev->program_result);
698 if (strcmp_pattern(dev->result, udev->program_result) != 0) {
699 dbg(FIELD_RESULT " is not matching");
702 dbg(FIELD_RESULT " matches");
706 /* check if we are instructed to ignore this device */
707 if (dev->name[0] == '\0') {
708 dbg("instructed to ignore this device");
712 /* Yup, this rule belongs to us! */
713 info("configured rule in '%s' at line %i applied, '%s' becomes '%s'",
714 udev_rules_filename, dev->config_line, udev->kernel_name, dev->name);
715 strfieldcpy(udev->name, dev->name);
716 strfieldcpy(udev->symlink, dev->symlink);
720 /* no rule was found so we use the kernel name */
721 strfieldcpy(udev->name, class_dev->name);
725 /* substitute placeholder */
726 apply_format(udev, udev->name);
727 apply_format(udev, udev->symlink);
730 perm = find_perm(udev->name);
732 udev->mode = perm->mode;
733 strfieldcpy(udev->owner, perm->owner);
734 strfieldcpy(udev->group, perm->group);
736 /* no matching perms found :( */
737 udev->mode = get_default_mode();
738 strncpy(udev->owner, get_default_owner(), OWNER_SIZE);
739 strncpy(udev->group, get_default_group(), GROUP_SIZE);
741 dbg("name, '%s' is going to have owner='%s', group='%s', mode = %#o",
742 udev->name, udev->owner, udev->group, udev->mode);
747 int namedev_init(void)
751 retval = namedev_init_rules();
755 retval = namedev_init_permissions();
759 dump_config_dev_list();
760 dump_perm_dev_list();