]>
git.ipfire.org Git - thirdparty/systemd.git/blob - namedev.c
6 * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
7 * Copyright (C) 2003-2005 Kay Sievers <kay.sievers@vrfy.org>
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the
12 * Free Software Foundation version 2 of the License.
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 675 Mass Ave, Cambridge, MA 02139, USA.
36 #include "libsysfs/sysfs/libsysfs.h"
39 #include "udev_utils.h"
40 #include "udev_version.h"
45 static struct sysfs_attribute
*find_sysfs_attribute(struct sysfs_class_device
*class_dev
, struct sysfs_device
*sysfs_device
, char *attr
);
47 /* compare string with pattern (supports * ? [0-9] [!A-Z]) */
48 static int strcmp_pattern(const char *p
, const char *s
)
53 return (p
[0] != '\0');
64 while ((p
[0] != '\0') && (p
[0] != ']')) {
67 if ((s
[0] >= p
[0]) && (s
[0] <= p
[2]))
71 match
= (p
[0] == s
[0]);
75 while ((p
[0] != '\0') && (p
[0] != ']'))
78 return strcmp_pattern(p
+1, s
+1);
84 if (strcmp_pattern(p
, s
+1))
85 return strcmp_pattern(p
+1, s
);
93 if ((p
[0] == s
[0]) || (p
[0] == '?'))
94 return strcmp_pattern(p
+1, s
+1);
100 /* extract possible {attr} and move str behind it */
101 static char *get_format_attribute(char **str
)
106 if (*str
[0] == '{') {
107 pos
= strchr(*str
, '}');
109 dbg("missing closing brace for format");
115 dbg("attribute='%s', str='%s'", attr
, *str
);
120 /* extract possible format length and move str behind it*/
121 static int get_format_len(char **str
)
126 if (isdigit(*str
[0])) {
127 num
= (int) strtoul(*str
, &tail
, 10);
130 dbg("format length=%i", num
);
133 dbg("format parsing error '%s'", *str
);
139 /** Finds the lowest positive N such that <name>N isn't present in
140 * $(udevroot) either as a file or a symlink.
142 * @param name Name to check for
143 * @return 0 if <name> didn't exist and N otherwise.
145 static int find_free_number(struct udevice
*udev
, const char *name
)
147 char filename
[NAME_SIZE
];
149 struct udevice db_udev
;
151 strfieldcpy(filename
, name
);
153 dbg("look for existing node '%s'", filename
);
154 memset(&db_udev
, 0x00, sizeof(struct udevice
));
155 if (udev_db_get_device_byname(&db_udev
, filename
) != 0) {
156 dbg("free num=%d", num
);
162 info("find_free_number gone crazy (num=%d), aborted", num
);
165 snprintf(filename
, NAME_SIZE
, "%s%d", name
, num
);
166 filename
[NAME_SIZE
-1] = '\0';
170 static void apply_format(struct udevice
*udev
, char *string
, size_t maxsize
,
171 struct sysfs_class_device
*class_dev
,
172 struct sysfs_device
*sysfs_device
)
174 char temp
[NAME_SIZE
];
175 char temp2
[NAME_SIZE
];
185 struct sysfs_attribute
*tmpattr
;
186 unsigned int next_free_number
;
187 struct sysfs_class_device
*class_dev_parent
;
191 pos
= strchr(pos
, '%');
197 len
= get_format_len(&tail
);
199 strfieldcpy(temp
, tail
+1);
201 dbg("format=%c, string='%s', tail='%s'",c
, string
, tail
);
202 attr
= get_format_attribute(&tail
);
207 if (strlen(udev
->devpath
) == 0)
209 strfieldcatmax(string
, udev
->devpath
, maxsize
);
210 dbg("substitute kernel name '%s'", udev
->kernel_name
);
213 if (strlen(udev
->bus_id
) == 0)
215 strfieldcatmax(string
, udev
->bus_id
, maxsize
);
216 dbg("substitute bus_id '%s'", udev
->bus_id
);
219 if (strlen(udev
->kernel_name
) == 0)
221 strfieldcatmax(string
, udev
->kernel_name
, maxsize
);
222 dbg("substitute kernel name '%s'", udev
->kernel_name
);
225 if (strlen(udev
->kernel_number
) == 0)
227 strfieldcatmax(string
, udev
->kernel_number
, maxsize
);
228 dbg("substitute kernel number '%s'", udev
->kernel_number
);
231 strintcatmax(string
, udev
->minor
, maxsize
);
232 dbg("substitute minor number '%u'", udev
->minor
);
235 strintcatmax(string
, udev
->major
, maxsize
);
236 dbg("substitute major number '%u'", udev
->major
);
239 if (strlen(udev
->program_result
) == 0)
241 /* get part part of the result string */
244 i
= strtoul(attr
, &rest
, 10);
246 foreach_strpart(udev
->program_result
, " \n\r", spos
, slen
) {
252 dbg("requested part of result string not found");
256 strfieldcpy(temp2
, spos
);
258 strfieldcpymax(temp2
, spos
, slen
+1);
259 strfieldcatmax(string
, temp2
, maxsize
);
260 dbg("substitute part of result string '%s'", temp2
);
262 strfieldcatmax(string
, udev
->program_result
, maxsize
);
263 dbg("substitute result string '%s'", udev
->program_result
);
268 tmpattr
= find_sysfs_attribute(class_dev
, sysfs_device
, attr
);
269 if (tmpattr
== NULL
) {
270 dbg("sysfa attribute '%s' not found", attr
);
273 /* strip trailing whitespace of matching value */
274 if (isspace(tmpattr
->value
[strlen(tmpattr
->value
)-1])) {
275 i
= len
= strlen(tmpattr
->value
);
276 while (i
> 0 && isspace(tmpattr
->value
[i
-1]))
279 tmpattr
->value
[i
] = '\0';
280 dbg("remove %i trailing whitespace chars from '%s'",
281 len
- i
, tmpattr
->value
);
284 strfieldcatmax(string
, tmpattr
->value
, maxsize
);
285 dbg("substitute sysfs value '%s'", tmpattr
->value
);
287 dbg("missing attribute");
291 strfieldcatmax(string
, "%", maxsize
);
295 next_free_number
= find_free_number(udev
, string
);
296 if (next_free_number
> 0) {
297 sprintf(temp2
, "%d", next_free_number
);
298 strfieldcatmax(string
, temp2
, maxsize
);
302 class_dev_parent
= sysfs_get_classdev_parent(class_dev
);
303 if (class_dev_parent
!= NULL
) {
304 struct udevice udev_parent
;
306 dbg("found parent '%s', get the node name", class_dev_parent
->path
);
307 memset(&udev_parent
, 0x00, sizeof(struct udevice
));
308 /* lookup the name in the udev_db with the DEVPATH of the parent */
309 strfieldcpy(udev_parent
.devpath
, &class_dev_parent
->path
[strlen(sysfs_path
)]);
310 if (udev_db_get_device(&udev_parent
) == 0) {
311 strfieldcatmax(string
, udev_parent
.name
, maxsize
);
312 dbg("substitute parent node name'%s'", udev_parent
.name
);
314 dbg("parent not found in database");
318 if (udev
->tmp_node
[0] == '\0') {
319 dbg("create temporary device node for callout");
320 snprintf(udev
->tmp_node
, NAME_SIZE
-1, "%s/.tmp-%u-%u", udev_root
, udev
->major
, udev
->minor
);
321 udev_make_node(udev
, udev
->tmp_node
, udev
->major
, udev
->minor
, 0600, 0, 0);
323 strfieldcatmax(string
, udev
->tmp_node
, maxsize
);
324 dbg("substitute temporary device node name '%s'", udev
->tmp_node
);
327 strfieldcatmax(string
, udev_root
, maxsize
);
328 dbg("substitute udev_root '%s'", udev_root
);
331 dbg("unknown substitution type '%%%c'", c
);
334 /* truncate to specified length */
338 strfieldcatmax(string
, tail
, maxsize
);
342 static void fix_kernel_name(struct udevice
*udev
)
344 char *temp
= udev
->kernel_name
;
346 while (*temp
!= 0x00) {
347 /* Some block devices have a ! in their name,
348 * we need to change that to / */
355 static int execute_program(struct udevice
*udev
, const char *path
, char *value
, int len
)
363 char arg
[PROGRAM_SIZE
];
364 char *argv
[(PROGRAM_SIZE
/ 2) + 1];
367 strfieldcpy(arg
, path
);
369 if (strchr(path
, ' ')) {
371 while (pos
!= NULL
) {
372 if (pos
[0] == '\'') {
373 /* don't separate if in apostrophes */
375 argv
[i
] = strsep(&pos
, "\'");
376 while (pos
&& pos
[0] == ' ')
379 argv
[i
] = strsep(&pos
, " ");
381 dbg("arg[%i] '%s'", i
, argv
[i
]);
385 dbg("execute '%s' with parsed arguments", arg
);
388 argv
[1] = udev
->subsystem
;
390 dbg("execute '%s' with subsystem '%s' argument", arg
, argv
[1]);
403 /* dup2 write side of pipe to STDOUT */
404 dup2(fds
[1], STDOUT_FILENO
);
405 retval
= execv(arg
, argv
);
407 info(FIELD_PROGRAM
" execution of '%s' failed", path
);
413 /* parent reads from fds[0] */
418 count
= read(fds
[0], value
+ i
, len
- i
-1);
424 dbg("result len %d too short", len
);
431 dbg("read failed with '%s'", strerror(errno
));
435 if (i
> 0 && value
[i
-1] == '\n')
438 dbg("result is '%s'", value
);
441 waitpid(pid
, &status
, 0);
443 if (!WIFEXITED(status
) || (WEXITSTATUS(status
) != 0)) {
444 dbg("exec program status 0x%x", status
);
451 static struct sysfs_attribute
*find_sysfs_attribute(struct sysfs_class_device
*class_dev
, struct sysfs_device
*sysfs_device
, char *attr
)
453 struct sysfs_attribute
*tmpattr
= NULL
;
456 dbg("look for device attribute '%s'", attr
);
457 /* try to find the attribute in the class device directory */
458 tmpattr
= sysfs_get_classdev_attr(class_dev
, attr
);
462 /* look in the class device directory if present */
464 tmpattr
= sysfs_get_device_attr(sysfs_device
, attr
);
472 c
= strchr(tmpattr
->value
, '\n');
476 dbg("found attribute '%s'", tmpattr
->path
);
480 static int compare_sysfs_attribute(struct sysfs_class_device
*class_dev
, struct sysfs_device
*sysfs_device
, struct sysfs_pair
*pair
)
482 struct sysfs_attribute
*tmpattr
;
486 if ((pair
== NULL
) || (pair
->file
[0] == '\0') || (pair
->value
== '\0'))
489 tmpattr
= find_sysfs_attribute(class_dev
, sysfs_device
, pair
->file
);
493 /* strip trailing whitespace of value, if not asked to match for it */
494 if (! isspace(pair
->value
[strlen(pair
->value
)-1])) {
495 i
= len
= strlen(tmpattr
->value
);
496 while (i
> 0 && isspace(tmpattr
->value
[i
-1]))
499 tmpattr
->value
[i
] = '\0';
500 dbg("remove %i trailing whitespace chars from '%s'",
501 len
- i
, tmpattr
->value
);
505 dbg("compare attribute '%s' value '%s' with '%s'",
506 pair
->file
, tmpattr
->value
, pair
->value
);
507 if (strcmp_pattern(pair
->value
, tmpattr
->value
) != 0)
510 dbg("found matching attribute '%s' with value '%s'",
511 pair
->file
, pair
->value
);
515 static int match_sysfs_pairs(struct config_device
*dev
, struct sysfs_class_device
*class_dev
, struct sysfs_device
*sysfs_device
)
517 struct sysfs_pair
*pair
;
520 for (i
= 0; i
< MAX_SYSFS_PAIRS
; ++i
) {
521 pair
= &dev
->sysfs_pair
[i
];
522 if ((pair
->file
[0] == '\0') || (pair
->value
[0] == '\0'))
524 if (compare_sysfs_attribute(class_dev
, sysfs_device
, pair
) != 0) {
525 dbg("sysfs attribute doesn't match");
533 static int match_id(struct config_device
*dev
, struct sysfs_class_device
*class_dev
, struct sysfs_device
*sysfs_device
)
535 char path
[SYSFS_PATH_MAX
];
538 /* we have to have a sysfs device for ID to work */
542 strfieldcpy(path
, sysfs_device
->path
);
543 temp
= strrchr(path
, '/');
545 dbg("search '%s' in '%s', path='%s'", dev
->id
, temp
, path
);
546 if (strcmp_pattern(dev
->id
, temp
) != 0)
552 static int match_place(struct config_device
*dev
, struct sysfs_class_device
*class_dev
, struct sysfs_device
*sysfs_device
)
554 char path
[SYSFS_PATH_MAX
];
558 /* we have to have a sysfs device for PLACE to work */
563 strfieldcpy(path
, sysfs_device
->path
);
564 temp
= strrchr(path
, '/');
565 dbg("search '%s' in '%s', path='%s'", dev
->place
, temp
, path
);
566 if (strstr(temp
, dev
->place
) != NULL
) {
570 temp
= strrchr(path
, '/');
571 dbg("search '%s' in '%s', path='%s'", dev
->place
, temp
, path
);
572 if (strstr(temp
, dev
->place
) != NULL
)
576 dbg("place doesn't match");
583 static int match_rule(struct udevice
*udev
, struct config_device
*dev
,
584 struct sysfs_class_device
*class_dev
, struct sysfs_device
*sysfs_device
)
586 /* check for matching kernel name */
587 if (dev
->kernel
[0] != '\0') {
588 dbg("check for " FIELD_KERNEL
" dev->kernel='%s' class_dev->name='%s'",
589 dev
->kernel
, class_dev
->name
);
590 if (strcmp_pattern(dev
->kernel
, class_dev
->name
) != 0) {
591 dbg(FIELD_KERNEL
" is not matching");
594 dbg(FIELD_KERNEL
" matches");
597 /* check for matching subsystem */
598 if (dev
->subsystem
[0] != '\0') {
599 dbg("check for " FIELD_SUBSYSTEM
" dev->subsystem='%s' class_dev->name='%s'",
600 dev
->subsystem
, class_dev
->name
);
601 if (strcmp_pattern(dev
->subsystem
, udev
->subsystem
) != 0) {
602 dbg(FIELD_SUBSYSTEM
" is not matching");
605 dbg(FIELD_SUBSYSTEM
" matches");
608 /* walk up the chain of physical devices and find a match */
610 /* check for matching driver */
611 if (dev
->driver
[0] != '\0') {
612 dbg("check for " FIELD_DRIVER
" dev->driver='%s' sysfs_device->driver_name='%s'",
613 dev
->driver
, sysfs_device
->driver_name
);
614 if (strcmp_pattern(dev
->driver
, sysfs_device
->driver_name
) != 0) {
615 dbg(FIELD_DRIVER
" is not matching");
618 dbg(FIELD_DRIVER
" matches");
621 /* check for matching bus value */
622 if (dev
->bus
[0] != '\0') {
623 if (sysfs_device
== NULL
) {
624 dbg("device has no bus");
627 dbg("check for " FIELD_BUS
" dev->bus='%s' sysfs_device->bus='%s'",
628 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");
636 /* check for matching bus id */
637 if (dev
->id
[0] != '\0') {
638 dbg("check " FIELD_ID
);
639 if (match_id(dev
, class_dev
, sysfs_device
) != 0) {
640 dbg(FIELD_ID
" is not matching");
643 dbg(FIELD_ID
" matches");
646 /* check for matching place of device */
647 if (dev
->place
[0] != '\0') {
648 dbg("check " FIELD_PLACE
);
649 if (match_place(dev
, class_dev
, sysfs_device
) != 0) {
650 dbg(FIELD_PLACE
" is not matching");
653 dbg(FIELD_PLACE
" matches");
656 /* check for matching sysfs pairs */
657 if (dev
->sysfs_pair
[0].file
[0] != '\0') {
658 dbg("check " FIELD_SYSFS
" pairs");
659 if (match_sysfs_pairs(dev
, class_dev
, sysfs_device
) != 0) {
660 dbg(FIELD_SYSFS
" is not matching");
663 dbg(FIELD_SYSFS
" matches");
666 /* found matching physical device */
669 dbg("try parent sysfs device");
670 sysfs_device
= sysfs_get_device_parent(sysfs_device
);
671 if (sysfs_device
== NULL
)
673 dbg("sysfs_device->path='%s'", sysfs_device
->path
);
674 dbg("sysfs_device->bus_id='%s'", sysfs_device
->bus_id
);
677 /* execute external program */
678 if (dev
->program
[0] != '\0') {
679 char program
[PROGRAM_SIZE
];
681 dbg("check " FIELD_PROGRAM
);
682 strfieldcpy(program
, dev
->program
);
683 apply_format(udev
, program
, sizeof(program
), class_dev
, sysfs_device
);
684 if (execute_program(udev
, program
, udev
->program_result
, NAME_SIZE
) != 0) {
685 dbg(FIELD_PROGRAM
" returned nonzero");
688 dbg(FIELD_PROGRAM
" returned successful");
691 /* check for matching result of external program */
692 if (dev
->result
[0] != '\0') {
693 dbg("check for " FIELD_RESULT
" dev->result='%s', udev->program_result='%s'",
694 dev
->result
, udev
->program_result
);
695 if (strcmp_pattern(dev
->result
, udev
->program_result
) != 0) {
696 dbg(FIELD_RESULT
" is not matching");
699 dbg(FIELD_RESULT
" matches");
709 int namedev_name_device(struct udevice
*udev
, struct sysfs_class_device
*class_dev
)
711 struct sysfs_class_device
*class_dev_parent
;
712 struct sysfs_device
*sysfs_device
= NULL
;
713 struct config_device
*dev
;
716 dbg("class_dev->name='%s'", class_dev
->name
);
718 /* Figure out where the "device"-symlink is at. For char devices this will
719 * always be in the class_dev->path. On block devices, only the main block
720 * device will have the device symlink in it's path. All partition devices
721 * need to look at the symlink in its parent directory.
723 class_dev_parent
= sysfs_get_classdev_parent(class_dev
);
724 if (class_dev_parent
!= NULL
) {
725 dbg("given class device has a parent, use this instead");
726 sysfs_device
= sysfs_get_classdev_device(class_dev_parent
);
728 sysfs_device
= sysfs_get_classdev_device(class_dev
);
732 dbg("found devices device: path='%s', bus_id='%s', bus='%s'",
733 sysfs_device
->path
, sysfs_device
->bus_id
, sysfs_device
->bus
);
734 strfieldcpy(udev
->bus_id
, sysfs_device
->bus_id
);
737 strfieldcpy(udev
->kernel_name
, class_dev
->name
);
738 fix_kernel_name(udev
);
739 dbg("udev->kernel_name = '%s'", udev
->kernel_name
);
741 /* get kernel number */
742 pos
= class_dev
->name
+ strlen(class_dev
->name
);
743 while (isdigit(*(pos
-1)))
745 strfieldcpy(udev
->kernel_number
, pos
);
746 dbg("kernel_number='%s'", udev
->kernel_number
);
748 /* look for a matching rule to apply */
749 list_for_each_entry(dev
, &config_device_list
, node
) {
751 if (match_rule(udev
, dev
, class_dev
, sysfs_device
) == 0) {
753 /* FIXME: remove old style ignore rule and make OPTION="ignore" mandatory */
754 if (dev
->name
[0] == '\0' && dev
->symlink
[0] == '\0' &&
755 dev
->mode
== 0000 && dev
->owner
[0] == '\0' && dev
->group
[0] == '\0' &&
756 !dev
->ignore_device
&& !dev
->partitions
&& !dev
->ignore_remove
) {
757 info("configured rule in '%s[%i]' applied, '%s' is ignored",
758 dev
->config_file
, dev
->config_line
, udev
->kernel_name
);
763 if (dev
->ignore_device
) {
764 info("configured rule in '%s[%i]' applied, '%s' is ignored",
765 dev
->config_file
, dev
->config_line
, udev
->kernel_name
);
768 if (dev
->ignore_remove
) {
769 udev
->ignore_remove
= dev
->ignore_remove
;
770 dbg_parse("remove event should be ignored");
772 /* apply all_partitions option only at a main block device */
773 if (dev
->partitions
&& udev
->type
== 'b' && udev
->kernel_number
[0] == '\0') {
774 udev
->partitions
= dev
->partitions
;
775 dbg("creation of partition nodes requested");
778 /* apply permissions */
779 if (dev
->mode
!= 0000) {
780 udev
->mode
= dev
->mode
;
781 dbg("applied mode=%#o to '%s'", udev
->mode
, udev
->kernel_name
);
783 if (dev
->owner
[0] != '\0') {
784 strfieldcpy(udev
->owner
, dev
->owner
);
785 apply_format(udev
, udev
->owner
, sizeof(udev
->owner
), class_dev
, sysfs_device
);
786 dbg("applied owner='%s' to '%s'", udev
->owner
, udev
->kernel_name
);
788 if (dev
->group
[0] != '\0') {
789 strfieldcpy(udev
->group
, dev
->group
);
790 apply_format(udev
, udev
->group
, sizeof(udev
->group
), class_dev
, sysfs_device
);
791 dbg("applied group='%s' to '%s'", udev
->group
, udev
->kernel_name
);
794 /* collect symlinks for this or the final matching rule */
795 if (dev
->symlink
[0] != '\0') {
796 char temp
[NAME_SIZE
];
798 info("configured rule in '%s[%i]' applied, added symlink '%s'",
799 dev
->config_file
, dev
->config_line
, dev
->symlink
);
800 strfieldcpy(temp
, dev
->symlink
);
801 apply_format(udev
, temp
, sizeof(temp
), class_dev
, sysfs_device
);
802 if (udev
->symlink
[0] != '\0')
803 strfieldcat(udev
->symlink
, " ");
804 strfieldcat(udev
->symlink
, temp
);
808 if (dev
->name
[0] != '\0') {
809 info("configured rule in '%s[%i]' applied, '%s' becomes '%s'",
810 dev
->config_file
, dev
->config_line
, udev
->kernel_name
, dev
->name
);
812 strfieldcpy(udev
->name
, dev
->name
);
813 apply_format(udev
, udev
->name
, sizeof(udev
->name
), class_dev
, sysfs_device
);
814 strfieldcpy(udev
->config_file
, dev
->config_file
);
815 udev
->config_line
= dev
->config_line
;
817 if (udev
->type
!= 'n')
818 dbg("name, '%s' is going to have owner='%s', group='%s', mode=%#o partitions=%i",
819 udev
->name
, udev
->owner
, udev
->group
, udev
->mode
, udev
->partitions
);
826 /* no rule matched, so we use the kernel name */
827 strfieldcpy(udev
->name
, udev
->kernel_name
);
828 dbg("no rule found, use kernel name '%s'", udev
->name
);
831 if (udev
->tmp_node
[0] != '\0') {
832 dbg("removing temporary device node");
833 unlink_secure(udev
->tmp_node
);
834 udev
->tmp_node
[0] = '\0';