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"
40 #include "udev_version.h"
43 #include "klibc_fixups.h"
46 static struct sysfs_attribute *find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, char *attr);
48 LIST_HEAD(config_device_list);
49 LIST_HEAD(perm_device_list);
52 /* compare string with pattern (supports * ? [0-9] [!A-Z]) */
53 static int strcmp_pattern(const char *p, const char *s)
58 return (p[0] != '\0');
69 while ((p[0] != '\0') && (p[0] != ']')) {
72 if ((s[0] >= p[0]) && (s[0] <= p[2]))
76 match = (p[0] == s[0]);
80 while ((p[0] != '\0') && (p[0] != ']'))
83 return strcmp_pattern(p+1, s+1);
89 if (strcmp_pattern(p, s+1))
90 return strcmp_pattern(p+1, s);
98 if ((p[0] == s[0]) || (p[0] == '?'))
99 return strcmp_pattern(p+1, s+1);
105 static struct perm_device *find_perm(char *name)
107 struct perm_device *perm;
109 list_for_each_entry(perm, &perm_device_list, node) {
110 if (strcmp_pattern(perm->name, name))
117 static mode_t get_default_mode(void)
119 mode_t mode = 0600; /* default to owner rw only */
121 if (strlen(default_mode_str) != 0)
122 mode = strtol(default_mode_str, NULL, 8);
127 static char *get_default_owner(void)
129 if (strlen(default_owner_str) == 0)
130 strfieldcpy(default_owner_str, "root");
132 return default_owner_str;
135 static char *get_default_group(void)
137 if (strlen(default_group_str) == 0)
138 strfieldcpy(default_group_str, "root");
140 return default_group_str;
143 /* extract possible {attr} and move str behind it */
144 static char *get_format_attribute(char **str)
149 if (*str[0] == '{') {
150 pos = strchr(*str, '}');
152 dbg("missing closing brace for format");
158 dbg("attribute='%s', str='%s'", attr, *str);
163 /* extract possible format length and move str behind it*/
164 static int get_format_len(char **str)
169 if (isdigit(*str[0])) {
170 num = (int) strtoul(*str, &tail, 10);
173 dbg("format length=%i", num);
176 dbg("format parsing error '%s'", *str);
182 /** Finds the lowest positive N such that <name>N isn't present in
183 * $(udevroot) either as a file or a symlink.
185 * @param name Name to check for
186 * @return 0 if <name> didn't exist and N otherwise.
188 static unsigned int find_free_number (struct udevice *udev, char *name)
190 char temp[NAME_SIZE];
191 char path[NAME_SIZE];
195 /* have to sweep the database for each lookup */
197 strncpy(temp, name, sizeof (temp));
199 if (udevdb_get_dev_byname(temp, path, &dev) != 0)
201 /* symlink might be stale if $(udevroot) isn't cleaned; check
202 * on major/minor to see if it's the same device
204 if (dev.major == udev->major && dev.minor == udev->minor)
206 snprintf (temp, sizeof(temp), "%s%d", name, ++result);
213 static void apply_format(struct udevice *udev, char *string, size_t maxsize,
214 struct sysfs_class_device *class_dev,
215 struct sysfs_device *sysfs_device)
217 char temp[NAME_SIZE];
218 char temp2[NAME_SIZE];
228 struct sysfs_attribute *tmpattr;
229 unsigned int next_free_number;
233 pos = strchr(pos, '%');
239 len = get_format_len(&tail);
241 strfieldcpy(temp, tail+1);
243 dbg("format=%c, string='%s', tail='%s'",c , string, tail);
244 attr = get_format_attribute(&tail);
249 if (strlen(udev->bus_id) == 0)
251 strfieldcatmax(string, udev->bus_id, maxsize);
252 dbg("substitute bus_id '%s'", udev->bus_id);
255 if (strlen(udev->kernel_name) == 0)
257 strfieldcatmax(string, udev->kernel_name, maxsize);
258 dbg("substitute kernel name '%s'", udev->kernel_name);
261 if (strlen(udev->kernel_number) == 0)
263 strfieldcatmax(string, udev->kernel_number, maxsize);
264 dbg("substitute kernel number '%s'", udev->kernel_number);
267 strintcatmax(string, udev->minor, maxsize);
268 dbg("substitute minor number '%u'", udev->minor);
271 strintcatmax(string, udev->major, maxsize);
272 dbg("substitute major number '%u'", udev->major);
275 if (strlen(udev->program_result) == 0)
277 /* get part part of the result string */
280 i = strtoul(attr, &rest, 10);
282 foreach_strpart(udev->program_result, " \n\r", spos, slen) {
288 dbg("requested part of result string not found");
292 strfieldcpy(temp2, spos);
294 strfieldcpymax(temp2, spos, slen+1);
295 strfieldcatmax(string, temp2, maxsize);
296 dbg("substitute part of result string '%s'", temp2);
298 strfieldcatmax(string, udev->program_result, maxsize);
299 dbg("substitute result string '%s'", udev->program_result);
304 tmpattr = find_sysfs_attribute(class_dev, sysfs_device, attr);
305 if (tmpattr == NULL) {
306 dbg("sysfa attribute '%s' not found", attr);
309 /* strip trailing whitespace of matching value */
310 if (isspace(tmpattr->value[strlen(tmpattr->value)-1])) {
311 i = len = strlen(tmpattr->value);
312 while (i > 0 && isspace(tmpattr->value[i-1]))
315 tmpattr->value[i] = '\0';
316 dbg("remove %i trailing whitespace chars from '%s'",
317 len - i, tmpattr->value);
320 strfieldcatmax(string, tmpattr->value, maxsize);
321 dbg("substitute sysfs value '%s'", tmpattr->value);
323 dbg("missing attribute");
327 strfieldcatmax(string, "%", maxsize);
331 next_free_number = find_free_number(udev, string);
332 if (next_free_number > 0) {
333 snprintf(temp2, sizeof(temp2), "%d", next_free_number);
334 strfieldcatmax(string, temp2, maxsize);
338 dbg("unknown substitution type '%%%c'", c);
341 /* truncate to specified length */
345 strfieldcatmax(string, tail, maxsize);
349 static void fix_kernel_name(struct udevice *udev)
351 char *temp = udev->kernel_name;
353 while (*temp != 0x00) {
354 /* Some block devices have a ! in their name,
355 * we need to change that to / */
362 static int execute_program(const char *path, char *value, int len)
370 char arg[PROGRAM_SIZE];
371 char *argv[(PROGRAM_SIZE / 2) + 1];
374 strfieldcpy(arg, path);
376 if (strchr(path, ' ')) {
378 while (pos != NULL) {
379 if (pos[0] == '\'') {
380 /* don't separate if in apostrophes */
382 argv[i] = strsep(&pos, "\'");
383 while (pos && pos[0] == ' ')
386 argv[i] = strsep(&pos, " ");
388 dbg("arg[%i] '%s'", i, argv[i]);
392 dbg("execute '%s' with parsed arguments", arg);
395 argv[1] = main_argv[1];
397 dbg("execute '%s' with subsystem '%s' argument", arg, argv[1]);
410 /* dup2 write side of pipe to STDOUT */
411 dup2(fds[1], STDOUT_FILENO);
412 retval = execv(arg, argv);
414 info(FIELD_PROGRAM " execution of '%s' failed", path);
420 /* parent reads from fds[0] */
425 count = read(fds[0], value + i, len - i-1);
431 dbg("result len %d too short", len);
438 dbg("read failed with '%s'", strerror(errno));
442 if (i > 0 && value[i-1] == '\n')
445 dbg("result is '%s'", value);
450 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
451 dbg("exec program status 0x%x", status);
458 static struct sysfs_attribute *find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, char *attr)
460 struct sysfs_attribute *tmpattr = NULL;
463 dbg("look for device attribute '%s'", attr);
464 /* try to find the attribute in the class device directory */
465 tmpattr = sysfs_get_classdev_attr(class_dev, attr);
469 /* look in the class device directory if present */
471 tmpattr = sysfs_get_device_attr(sysfs_device, attr);
479 c = strchr(tmpattr->value, '\n');
483 dbg("found attribute '%s'", tmpattr->path);
487 static int compare_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, struct sysfs_pair *pair)
489 struct sysfs_attribute *tmpattr;
493 if ((pair == NULL) || (pair->file[0] == '\0') || (pair->value == '\0'))
496 tmpattr = find_sysfs_attribute(class_dev, sysfs_device, pair->file);
500 /* strip trailing whitespace of value, if not asked to match for it */
501 if (! isspace(pair->value[strlen(pair->value)-1])) {
502 i = len = strlen(tmpattr->value);
503 while (i > 0 && isspace(tmpattr->value[i-1]))
506 tmpattr->value[i] = '\0';
507 dbg("remove %i trailing whitespace chars from '%s'",
508 len - i, tmpattr->value);
512 dbg("compare attribute '%s' value '%s' with '%s'",
513 pair->file, tmpattr->value, pair->value);
514 if (strcmp_pattern(pair->value, tmpattr->value) != 0)
517 dbg("found matching attribute '%s' with value '%s'",
518 pair->file, pair->value);
522 static int match_sysfs_pairs(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
524 struct sysfs_pair *pair;
527 for (i = 0; i < MAX_SYSFS_PAIRS; ++i) {
528 pair = &dev->sysfs_pair[i];
529 if ((pair->file[0] == '\0') || (pair->value[0] == '\0'))
531 if (compare_sysfs_attribute(class_dev, sysfs_device, pair) != 0) {
532 dbg("sysfs attribute doesn't match");
540 static int match_id(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
542 char path[SYSFS_PATH_MAX];
545 /* we have to have a sysfs device for ID to work */
549 strfieldcpy(path, sysfs_device->path);
550 temp = strrchr(path, '/');
552 dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
553 if (strcmp_pattern(dev->id, temp) != 0)
559 static int match_place(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
561 char path[SYSFS_PATH_MAX];
565 /* we have to have a sysfs device for PLACE to work */
570 strfieldcpy(path, sysfs_device->path);
571 temp = strrchr(path, '/');
572 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
573 if (strstr(temp, dev->place) != NULL) {
577 temp = strrchr(path, '/');
578 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
579 if (strstr(temp, dev->place) != NULL)
583 dbg("place doesn't match");
590 static int match_rule(struct config_device *dev, struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
593 /* check for matching bus value */
594 if (dev->bus[0] != '\0') {
595 if (sysfs_device == NULL) {
596 dbg("device has no bus");
599 dbg("check for " FIELD_BUS " dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
600 if (strcmp_pattern(dev->bus, sysfs_device->bus) != 0) {
601 dbg(FIELD_BUS " is not matching");
604 dbg(FIELD_BUS " matches");
608 /* check for matching kernel name*/
609 if (dev->kernel[0] != '\0') {
610 dbg("check for " FIELD_KERNEL " dev->kernel='%s' class_dev->name='%s'", dev->kernel, class_dev->name);
611 if (strcmp_pattern(dev->kernel, class_dev->name) != 0) {
612 dbg(FIELD_KERNEL " is not matching");
615 dbg(FIELD_KERNEL " 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(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);
690 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
695 int namedev_name_device(struct sysfs_class_device *class_dev, struct udevice *udev)
697 struct sysfs_class_device *class_dev_parent;
698 struct sysfs_device *sysfs_device = NULL;
699 struct config_device *dev;
700 struct perm_device *perm;
705 dbg("class_dev->name='%s'", class_dev->name);
707 /* Figure out where the "device"-symlink is at. For char devices this will
708 * always be in the class_dev->path. On block devices, only the main block
709 * device will have the device symlink in it's path. All partition devices
710 * need to look at the symlink in its parent directory.
712 class_dev_parent = sysfs_get_classdev_parent(class_dev);
713 if (class_dev_parent != NULL) {
714 dbg("given class device has a parent, use this instead");
715 sysfs_device = sysfs_get_classdev_device(class_dev_parent);
717 sysfs_device = sysfs_get_classdev_device(class_dev);
721 dbg("found /device-device: path='%s', bus_id='%s', bus='%s'",
722 sysfs_device->path, sysfs_device->bus_id, sysfs_device->bus);
723 strfieldcpy(udev->bus_id, sysfs_device->bus_id);
726 strfieldcpy(udev->kernel_name, class_dev->name);
727 fix_kernel_name(udev);
728 dbg("udev->kernel_name = '%s'", udev->kernel_name);
730 /* get kernel number */
731 pos = class_dev->name + strlen(class_dev->name);
732 while (isdigit(*(pos-1)))
734 strfieldcpy(udev->kernel_number, pos);
735 dbg("kernel_number='%s'", udev->kernel_number);
737 /* look for a matching rule to apply */
738 list_for_each_entry(dev, &config_device_list, node) {
740 if (match_rule(dev, class_dev, udev, sysfs_device) == 0) {
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 if (dev->symlink[0] != '\0') {
748 char temp[NAME_SIZE];
750 info("configured rule in '%s' at line %i applied, added symlink '%s'",
751 dev->config_file, dev->config_line, dev->symlink);
752 strfieldcpy(temp, dev->symlink);
753 apply_format(udev, temp, sizeof(temp), class_dev, sysfs_device);
754 if (udev->symlink[0] != '\0')
755 strfieldcat(udev->symlink, " ");
756 strfieldcat(udev->symlink, temp);
759 if (dev->name[0] != '\0') {
760 /* apply all_partitions flag only at a main block device */
761 if (dev->partitions > 0 &&
762 (udev->type != 'b' || udev->kernel_number[0] != '\0'))
765 info("configured rule in '%s' at line %i applied, '%s' becomes '%s'",
766 dev->config_file, dev->config_line, udev->kernel_name, dev->name);
767 strfieldcpy(udev->name, dev->name);
772 /* no rule was found so we use the kernel name */
773 strfieldcpy(udev->name, udev->kernel_name);
774 if (udev->type == 'n')
780 apply_format(udev, udev->name, sizeof(udev->name), class_dev, sysfs_device);
781 strfieldcpy(udev->config_file, dev->config_file);
782 udev->config_line = dev->config_line;
784 if (udev->type == 'n')
787 udev->partitions = dev->partitions;
789 /* get permissions given in rule */
790 set_empty_perms(udev, dev->mode,
795 /* get permissions given in config file or set defaults */
796 perm = find_perm(udev->name);
798 set_empty_perms(udev, perm->mode,
802 set_empty_perms(udev, get_default_mode(),
804 get_default_group());
807 dbg("name, '%s' is going to have owner='%s', group='%s', mode = %#o",
808 udev->name, udev->owner, udev->group, udev->mode);
811 /* store time of action */
813 udev->config_uptime = info.uptime;
818 int namedev_init(void)
822 retval = namedev_init_rules();
826 retval = namedev_init_permissions();
830 dump_config_dev_list();
831 dump_perm_dev_list();