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"
40 #include "libsysfs/libsysfs.h"
41 #include "klibc_fixups.h"
43 LIST_HEAD(config_device_list);
44 LIST_HEAD(perm_device_list);
46 /* compare string with pattern (supports * ? [0-9] [!A-Z]) */
47 static int strcmp_pattern(const char *p, const char *s)
63 while (*p && (*p != ']')) {
66 if ((*s >= *p) && (*s <= p[2]))
74 while (*p && (*p != ']'))
76 return strcmp_pattern(p+1, s+1);
82 if (strcmp_pattern(p, s+1))
83 return strcmp_pattern(p+1, s);
91 if ((*p == *s) || (*p == '?'))
92 return strcmp_pattern(p+1, s+1);
98 #define copy_var(a, b, var) \
102 #define copy_string(a, b, var) \
103 if (strlen(b->var)) \
104 strcpy(a->var, b->var);
106 int add_perm_dev(struct perm_device *new_dev)
108 struct perm_device *dev;
109 struct perm_device *tmp_dev;
111 /* update the values if we already have the device */
112 list_for_each_entry(dev, &perm_device_list, node) {
113 if (strcmp_pattern(new_dev->name, dev->name))
115 copy_var(dev, new_dev, mode);
116 copy_string(dev, new_dev, owner);
117 copy_string(dev, new_dev, group);
121 /* not found, add new structure to the perm list */
122 tmp_dev = malloc(sizeof(*tmp_dev));
125 memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
126 list_add_tail(&tmp_dev->node, &perm_device_list);
127 //dump_perm_dev(tmp_dev);
131 static struct perm_device *find_perm(char *name)
133 struct perm_device *perm;
135 list_for_each_entry(perm, &perm_device_list, node) {
136 if (strcmp_pattern(perm->name, name))
143 static mode_t get_default_mode(struct sysfs_class_device *class_dev)
145 mode_t mode = 0600; /* default to owner rw only */
147 if (strlen(default_mode_str) != 0) {
148 mode = strtol(default_mode_str, NULL, 8);
153 static void apply_format(struct udevice *udev, unsigned char *string)
155 char temp[NAME_SIZE];
156 char temp1[NAME_SIZE];
166 pos = strchr(pos, '%');
171 if (isdigit(tail[0])) {
172 num = (int) strtoul(&pos[1], &tail, 10);
174 dbg("format parsing error '%s'", pos+1);
178 strfieldcpy(temp, tail+1);
182 if (strlen(udev->bus_id) == 0)
184 strcat(pos, udev->bus_id);
185 dbg("substitute bus_id '%s'", udev->bus_id);
188 if (strlen(udev->kernel_name) == 0)
190 strcat(pos, udev->kernel_name);
191 dbg("substitute kernel name '%s'", udev->kernel_name);
194 if (strlen(udev->kernel_number) == 0)
196 strcat(pos, udev->kernel_number);
197 dbg("substitute kernel number '%s'", udev->kernel_number);
200 if (strlen(udev->kernel_number) == 0) {
202 dbg("substitute devfs disc");
206 strcat(pos, udev->kernel_number);
207 dbg("substitute devfs part '%s'", udev->kernel_number);
210 sprintf(pos, "%u", udev->minor);
211 dbg("substitute minor number '%u'", udev->minor);
214 sprintf(pos, "%u", udev->major);
215 dbg("substitute major number '%u'", udev->major);
218 if (strlen(udev->program_result) == 0)
221 /* get part of return string */
222 strncpy(temp1, udev->program_result, sizeof(temp1));
226 pos3 = strsep(&pos2, " ");
228 dbg("requested part of result string not found");
234 dbg("substitute part of result string '%s'", pos3);
237 strcat(pos, udev->program_result);
238 dbg("substitute result string '%s'", udev->program_result);
246 dbg("unknown substitution type '%%%c'", pos[1]);
249 strcat(string, temp);
255 static struct bus_file {
259 { .bus = "scsi", .file = "vendor" },
260 { .bus = "usb", .file = "idVendor" },
261 { .bus = "usb-serial", .file = "detach_state" },
262 { .bus = "ide", .file = "detach_state" },
263 { .bus = "pci", .file = "vendor" },
267 #define SECONDS_TO_WAIT_FOR_FILE 10
268 static void wait_for_device_to_initialize(struct sysfs_device *sysfs_device)
270 /* sleep until we see the file for this specific bus type show up this
271 * is needed because we can easily out-run the kernel in looking for
272 * these files before the paticular subsystem has created them in the
273 * sysfs tree properly.
275 * And people thought that the /sbin/hotplug event system was going to
276 * be slow, poo on you for arguing that before even testing it...
278 struct bus_file *b = &bus_files[0];
279 struct sysfs_attribute *tmpattr;
285 if (strcmp(sysfs_device->bus, b->bus) == 0) {
287 loop = SECONDS_TO_WAIT_FOR_FILE;
289 dbg("looking for file '%s' on bus '%s'", b->file, b->bus);
290 tmpattr = sysfs_get_device_attr(sysfs_device, b->file);
295 /* sleep to give the kernel a chance to create the file */
298 dbg("Timed out waiting for '%s' file, continuing on anyway...", b->file);
303 dbg("Did not find bus type '%s' on list of bus_id_files, contact greg@kroah.com", sysfs_device->bus);
305 return; /* here to prevent compiler warning... */
308 static int execute_program(char *path, char *value, int len)
318 char *args[PROGRAM_MAXARG];
321 dbg("executing '%s'", path);
335 close(STDOUT_FILENO);
336 dup(fds[1]); /* dup write side of pipe to STDOUT */
337 if (strchr(path, ' ')) {
338 /* exec with arguments */
340 for (i=0; i < PROGRAM_MAXARG-1; i++) {
341 args[i] = strsep(&pos, " ");
346 dbg("too many args - %d", i);
349 retval = execve(args[0], args, main_envp);
351 retval = execve(path, main_argv, main_envp);
354 dbg("child execve failed");
357 return -1; /* avoid compiler warning */
359 /* parent reads from fds[0] */
363 res = read(fds[0], buffer, sizeof(buffer) - 1);
368 dbg("result len %d too short", len);
372 dbg("result value already set");
376 strncpy(value, buffer, len);
377 pos = value + strlen(value)-1;
380 dbg("result is '%s'", value);
386 dbg("wait failed result %d", res);
390 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
391 dbg("exec program status 0x%x", status);
398 static int compare_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, struct sysfs_pair *pair)
400 struct sysfs_attribute *tmpattr = NULL;
403 if ((pair == NULL) || (pair->file[0] == '\0') || (pair->value == '\0'))
406 dbg("look for device attribute '%s'", pair->file);
407 /* try to find the attribute in the class device directory */
408 tmpattr = sysfs_get_classdev_attr(class_dev, pair->file);
412 /* look in the class device directory if present */
414 tmpattr = sysfs_get_device_attr(sysfs_device, pair->file);
421 c = tmpattr->value + strlen(tmpattr->value)-1;
424 dbg("compare attribute '%s' value '%s' with '%s'",
425 pair->file, tmpattr->value, pair->value);
426 if (strcmp_pattern(pair->value, tmpattr->value) != 0)
429 dbg("found matching attribute '%s' with value '%s'",
430 pair->file, pair->value);
434 static int match_sysfs_pairs(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
436 struct sysfs_pair *pair;
439 for (i = 0; i < MAX_SYSFS_PAIRS; ++i) {
440 pair = &dev->sysfs_pair[i];
441 if ((pair->file[0] == '\0') || (pair->value[0] == '\0'))
443 if (compare_sysfs_attribute(class_dev, sysfs_device, pair) != 0) {
444 dbg("sysfs attribute doesn't match");
452 static int match_id(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
454 char path[SYSFS_PATH_MAX];
458 /* we have to have a sysfs device for ID to work */
463 strfieldcpy(path, sysfs_device->path);
464 temp = strrchr(path, '/');
465 dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
466 if (strstr(temp, dev->id) != NULL) {
470 temp = strrchr(path, '/');
471 dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
472 if (strstr(temp, dev->id) != NULL)
476 dbg("id doesn't match");
483 static int match_place(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
485 char path[SYSFS_PATH_MAX];
489 /* we have to have a sysfs device for PLACE to work */
494 strfieldcpy(path, sysfs_device->path);
495 temp = strrchr(path, '/');
496 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
497 if (strstr(temp, dev->place) != NULL) {
501 temp = strrchr(path, '/');
502 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
503 if (strstr(temp, dev->place) != NULL)
507 dbg("place doesn't match");
514 static struct sysfs_device *get_sysfs_device(struct sysfs_class_device *class_dev)
516 struct sysfs_device *sysfs_device;
517 struct sysfs_class_device *class_dev_parent;
518 struct timespec tspec;
521 /* Figure out where the device symlink is at. For char devices this will
522 * always be in the class_dev->path. But for block devices, it's different.
523 * The main block device will have the device symlink in it's path, but
524 * all partitions have the symlink in its parent directory.
525 * But we need to watch out for block devices that do not have parents, yet
526 * look like a partition (fd0, loop0, etc.) They all do not have a device
527 * symlink yet. We do sit and spin on waiting for them right now, we should
528 * possibly have a whitelist for these devices here...
530 class_dev_parent = sysfs_get_classdev_parent(class_dev);
531 if (class_dev_parent)
532 dbg("Really a partition");
535 tspec.tv_nsec = 10000000; /* sleep 10 millisec */
538 nanosleep(&tspec, NULL);
539 if (class_dev_parent)
540 sysfs_device = sysfs_get_classdev_device(class_dev_parent);
542 sysfs_device = sysfs_get_classdev_device(class_dev);
544 if (sysfs_device != NULL)
547 dbg("Timed out waiting for device symlink, continuing on anyway...");
550 /* We have another issue with just the wait above - the sysfs part of
551 * the kernel may not be quick enough to have created the link to the
552 * device under the "bus" subsystem. Due to this, the sysfs_device->bus
553 * will not contain the actual bus name :(
555 * Libsysfs now provides a new API sysfs_get_device_bus(), so use it
560 if (sysfs_device->bus[0] != '\0')
564 tspec.tv_nsec = 10000000;
566 nanosleep(&tspec, NULL);
567 sysfs_get_device_bus(sysfs_device);
569 if (sysfs_device->bus[0] != '\0')
572 dbg("Timed out waiting to find the device bus, continuing on anyway\n");
575 dbg("Device %s is registered with bus %s\n",
576 sysfs_device->name, sysfs_device->bus);
582 int namedev_name_device(struct sysfs_class_device *class_dev, struct udevice *udev)
584 struct sysfs_device *sysfs_device = NULL;
585 struct config_device *dev;
586 struct perm_device *perm;
591 /* find the sysfs_device associated with this class device */
592 sysfs_device = get_sysfs_device(class_dev);
594 dbg("sysfs_device->path='%s'", sysfs_device->path);
595 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
596 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
597 strfieldcpy(udev->bus_id, sysfs_device->bus_id);
598 wait_for_device_to_initialize(sysfs_device);
600 dbg("class_dev->name = '%s'", class_dev->name);
603 strfieldcpy(udev->kernel_name, class_dev->name);
605 /* get kernel number */
606 pos = class_dev->name + strlen(class_dev->name);
607 while (isdigit(*(pos-1)))
609 strfieldcpy(udev->kernel_number, pos);
610 dbg("kernel_number='%s'", udev->kernel_number);
612 /* look for a matching rule to apply */
613 list_for_each_entry(dev, &config_device_list, node) {
616 /* check for matching bus value */
617 if (dev->bus[0] != '\0') {
618 if (sysfs_device == NULL) {
619 dbg("device has no bus");
622 dbg("check for " FIELD_BUS " dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
623 if (strcmp_pattern(dev->bus, sysfs_device->bus) != 0) {
624 dbg(FIELD_BUS " is not matching");
627 dbg(FIELD_BUS " matches");
631 /* check for matching kernel name*/
632 if (dev->kernel[0] != '\0') {
633 dbg("check for " FIELD_KERNEL " dev->kernel='%s' class_dev->name='%s'", dev->kernel, class_dev->name);
634 if (strcmp_pattern(dev->kernel, class_dev->name) != 0) {
635 dbg(FIELD_KERNEL " is not matching");
638 dbg(FIELD_KERNEL " matches");
642 /* check for matching bus id */
643 if (dev->id[0] != '\0') {
644 dbg("check " FIELD_ID);
645 if (match_id(dev, class_dev, sysfs_device) != 0) {
646 dbg(FIELD_ID " is not matching");
649 dbg(FIELD_ID " matches");
653 /* check for matching place of device */
654 if (dev->place[0] != '\0') {
655 dbg("check " FIELD_PLACE);
656 if (match_place(dev, class_dev, sysfs_device) != 0) {
657 dbg(FIELD_PLACE " is not matching");
660 dbg(FIELD_PLACE " matches");
664 /* check for matching sysfs pairs */
665 if (dev->sysfs_pair[0].file[0] != '\0') {
666 dbg("check " FIELD_SYSFS " pairs");
667 if (match_sysfs_pairs(dev, class_dev, sysfs_device) != 0) {
668 dbg(FIELD_SYSFS " is not matching");
671 dbg(FIELD_SYSFS " matches");
675 /* execute external program */
676 if (dev->program[0] != '\0') {
677 dbg("check " FIELD_PROGRAM);
678 apply_format(udev, dev->program);
679 if (execute_program(dev->program, udev->program_result, NAME_SIZE) != 0) {
680 dbg(FIELD_PROGRAM " returned nozero");
683 dbg(FIELD_PROGRAM " returned successful");
687 /* check for matching result of external program */
688 if (dev->result[0] != '\0') {
689 dbg("check for " FIELD_RESULT
690 " dev->result='%s', udev->program_result='%s'",
691 dev->result, udev->program_result);
692 if (strcmp_pattern(dev->result, udev->program_result) != 0) {
693 dbg(FIELD_RESULT " is not matching");
696 dbg(FIELD_RESULT " matches");
700 /* check if we are instructed to ignore this device */
701 if (dev->name[0] == '\0') {
702 dbg("instructed to ignore this device");
706 /* Yup, this rule belongs to us! */
707 dbg("found matching rule, '%s' becomes '%s'", dev->kernel, dev->name);
708 strfieldcpy(udev->name, dev->name);
709 strfieldcpy(udev->symlink, dev->symlink);
713 /* no rule was found so we use the kernel name */
714 strfieldcpy(udev->name, class_dev->name);
718 /* substitute placeholder */
719 apply_format(udev, udev->name);
720 apply_format(udev, udev->symlink);
723 perm = find_perm(udev->name);
725 udev->mode = perm->mode;
726 strfieldcpy(udev->owner, perm->owner);
727 strfieldcpy(udev->group, perm->group);
729 /* no matching perms found :( */
730 udev->mode = get_default_mode(class_dev);
731 udev->owner[0] = 0x00;
732 udev->group[0] = 0x00;
734 dbg("name, '%s' is going to have owner='%s', group='%s', mode = %#o",
735 udev->name, udev->owner, udev->group, udev->mode);
740 int namedev_init(void)
744 retval = namedev_init_rules();
748 retval = namedev_init_permissions();
752 dump_config_dev_list();
753 dump_perm_dev_list();