]>
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"
38 #include "udev_libc_wrapper.h"
40 #include "udev_utils.h"
41 #include "udev_version.h"
46 static struct sysfs_attribute
*find_sysfs_attribute(struct sysfs_class_device
*class_dev
, struct sysfs_device
*sysfs_device
, char *attr
);
48 /* compare string with pattern (supports * ? [0-9] [!A-Z]) */
49 static int strcmp_pattern(const char *p
, const char *s
)
54 return (p
[0] != '\0');
65 while ((p
[0] != '\0') && (p
[0] != ']')) {
68 if ((s
[0] >= p
[0]) && (s
[0] <= p
[2]))
72 match
= (p
[0] == s
[0]);
76 while ((p
[0] != '\0') && (p
[0] != ']'))
79 return strcmp_pattern(p
+1, s
+1);
85 if (strcmp_pattern(p
, s
+1))
86 return strcmp_pattern(p
+1, s
);
94 if ((p
[0] == s
[0]) || (p
[0] == '?'))
95 return strcmp_pattern(p
+1, s
+1);
101 /* extract possible {attr} and move str behind it */
102 static char *get_format_attribute(char **str
)
107 if (*str
[0] == '{') {
108 pos
= strchr(*str
, '}');
110 dbg("missing closing brace for format");
116 dbg("attribute='%s', str='%s'", attr
, *str
);
121 /* extract possible format length and move str behind it*/
122 static int get_format_len(char **str
)
127 if (isdigit(*str
[0])) {
128 num
= (int) strtoul(*str
, &tail
, 10);
131 dbg("format length=%i", num
);
134 dbg("format parsing error '%s'", *str
);
140 /** Finds the lowest positive N such that <name>N isn't present in
141 * $(udevroot) either as a file or a symlink.
143 * @param name Name to check for
144 * @return 0 if <name> didn't exist and N otherwise.
146 static int find_free_number(struct udevice
*udev
, const char *name
)
148 char devpath
[PATH_SIZE
];
149 char filename
[PATH_SIZE
];
152 strlcpy(filename
, name
, sizeof(filename
));
154 dbg("look for existing node '%s'", filename
);
155 if (udev_db_search_name(devpath
, sizeof(devpath
), filename
) != 0) {
156 dbg("free num=%d", num
);
162 info("find_free_number gone crazy (num=%d), aborted", num
);
165 snprintf(filename
, sizeof(filename
), "%s%d", name
, num
);
166 filename
[sizeof(filename
)-1] = '\0';
170 static void apply_format(struct udevice
*udev
, char *string
, size_t maxsize
,
171 struct sysfs_class_device
*class_dev
, struct sysfs_device
*sysfs_device
)
173 char temp
[PATH_SIZE
];
174 char temp2
[PATH_SIZE
];
175 char *tail
, *pos
, *cpos
, *attr
, *rest
;
179 struct sysfs_attribute
*tmpattr
;
180 unsigned int next_free_number
;
181 struct sysfs_class_device
*class_dev_parent
;
185 pos
= strchr(pos
, '%');
191 len
= get_format_len(&tail
);
193 strlcpy(temp
, tail
+1, sizeof(temp
));
195 dbg("format=%c, string='%s', tail='%s'",c
, string
, tail
);
196 attr
= get_format_attribute(&tail
);
200 strlcat(string
, udev
->devpath
, maxsize
);
201 dbg("substitute kernel name '%s'", udev
->kernel_name
);
204 strlcat(string
, udev
->bus_id
, maxsize
);
205 dbg("substitute bus_id '%s'", udev
->bus_id
);
208 strlcat(string
, udev
->kernel_name
, maxsize
);
209 dbg("substitute kernel name '%s'", udev
->kernel_name
);
212 strlcat(string
, udev
->kernel_number
, maxsize
);
213 dbg("substitute kernel number '%s'", udev
->kernel_number
);
216 sprintf(temp2
, "%d", minor(udev
->devt
));
217 strlcat(string
, temp2
, maxsize
);
218 dbg("substitute minor number '%s'", temp2
);
221 sprintf(temp2
, "%d", major(udev
->devt
));
222 strlcat(string
, temp2
, maxsize
);
223 dbg("substitute major number '%s'", temp2
);
226 if (udev
->program_result
[0] == '\0')
228 /* get part part of the result string */
231 i
= strtoul(attr
, &rest
, 10);
233 dbg("request part #%d of result string", i
);
234 cpos
= udev
->program_result
;
236 while (cpos
[0] != '\0' && !isspace(cpos
[0]))
238 while (isspace(cpos
[0]))
242 dbg("requested part of result string not found");
245 strlcpy(temp2
, cpos
, sizeof(temp2
));
246 /* %{2+}c copies the whole string from the second part on */
247 if (rest
[0] != '+') {
248 cpos
= strchr(temp2
, ' ');
252 strlcat(string
, temp2
, maxsize
);
253 dbg("substitute part of result string '%s'", temp2
);
255 strlcat(string
, udev
->program_result
, maxsize
);
256 dbg("substitute result string '%s'", udev
->program_result
);
263 dbg("missing attribute");
266 tmpattr
= find_sysfs_attribute(class_dev
, sysfs_device
, attr
);
267 if (tmpattr
== NULL
) {
268 dbg("sysfa attribute '%s' not found", attr
);
271 /* strip trailing whitespace of matching value */
272 if (isspace(tmpattr
->value
[strlen(tmpattr
->value
)-1])) {
273 i
= len
= strlen(tmpattr
->value
);
274 while (i
> 0 && isspace(tmpattr
->value
[i
-1]))
277 tmpattr
->value
[i
] = '\0';
278 dbg("remove %i trailing whitespace chars from '%s'",
279 len
- i
, tmpattr
->value
);
282 strlcat(string
, tmpattr
->value
, maxsize
);
283 dbg("substitute sysfs value '%s'", tmpattr
->value
);
286 strlcat(string
, "%", maxsize
);
290 next_free_number
= find_free_number(udev
, string
);
291 if (next_free_number
> 0) {
292 sprintf(temp2
, "%d", next_free_number
);
293 strlcat(string
, temp2
, maxsize
);
299 class_dev_parent
= sysfs_get_classdev_parent(class_dev
);
300 if (class_dev_parent
!= NULL
) {
301 struct udevice udev_parent
;
303 dbg("found parent '%s', get the node name", class_dev_parent
->path
);
304 udev_init_device(&udev_parent
, NULL
, NULL
);
305 /* lookup the name in the udev_db with the DEVPATH of the parent */
306 if (udev_db_get_device(&udev_parent
, &class_dev_parent
->path
[strlen(sysfs_path
)]) == 0) {
307 strlcat(string
, udev_parent
.name
, maxsize
);
308 dbg("substitute parent node name'%s'", udev_parent
.name
);
310 dbg("parent not found in database");
311 udev_cleanup_device(&udev_parent
);
315 if (udev
->tmp_node
[0] == '\0') {
316 dbg("create temporary device node for callout");
317 snprintf(udev
->tmp_node
, sizeof(udev
->tmp_node
), "%s/.tmp-%u-%u",
318 udev_root
, major(udev
->devt
), minor(udev
->devt
));
319 udev
->tmp_node
[sizeof(udev
->tmp_node
)-1] = '\0';
320 udev_make_node(udev
, udev
->tmp_node
, udev
->devt
, 0600, 0, 0);
322 strlcat(string
, udev
->tmp_node
, maxsize
);
323 dbg("substitute temporary device node name '%s'", udev
->tmp_node
);
326 strlcat(string
, udev_root
, maxsize
);
327 dbg("substitute udev_root '%s'", udev_root
);
330 dbg("unknown substitution type '%%%c'", c
);
333 /* truncate to specified length */
337 strlcat(string
, tail
, maxsize
);
341 static int execute_program(struct udevice
*udev
, const char *path
, char *value
, int len
)
350 char *argv
[(sizeof(arg
) / 2) + 1];
353 strlcpy(arg
, path
, sizeof(arg
));
355 if (strchr(path
, ' ')) {
357 while (pos
!= NULL
) {
358 if (pos
[0] == '\'') {
359 /* don't separate if in apostrophes */
361 argv
[i
] = strsep(&pos
, "\'");
362 while (pos
&& pos
[0] == ' ')
365 argv
[i
] = strsep(&pos
, " ");
367 dbg("arg[%i] '%s'", i
, argv
[i
]);
371 dbg("execute '%s' with parsed arguments", arg
);
374 argv
[1] = udev
->subsystem
;
376 dbg("execute '%s' with subsystem '%s' argument", arg
, argv
[1]);
389 /* dup2 write side of pipe to STDOUT */
390 dup2(fds
[1], STDOUT_FILENO
);
391 retval
= execv(arg
, argv
);
393 info(FIELD_PROGRAM
" execution of '%s' failed", path
);
399 /* parent reads from fds[0] */
404 count
= read(fds
[0], value
+ i
, len
- i
-1);
410 dbg("result len %d too short", len
);
417 dbg("read failed with '%s'", strerror(errno
));
421 if (i
> 0 && value
[i
-1] == '\n')
424 dbg("result is '%s'", value
);
427 waitpid(pid
, &status
, 0);
429 if (!WIFEXITED(status
) || (WEXITSTATUS(status
) != 0)) {
430 dbg("exec program status 0x%x", status
);
437 static struct sysfs_attribute
*find_sysfs_attribute(struct sysfs_class_device
*class_dev
, struct sysfs_device
*sysfs_device
, char *attr
)
439 struct sysfs_attribute
*tmpattr
= NULL
;
442 dbg("look for device attribute '%s'", attr
);
443 /* try to find the attribute in the class device directory */
444 tmpattr
= sysfs_get_classdev_attr(class_dev
, attr
);
448 /* look in the class device directory if present */
450 tmpattr
= sysfs_get_device_attr(sysfs_device
, attr
);
458 c
= strchr(tmpattr
->value
, '\n');
462 dbg("found attribute '%s'", tmpattr
->path
);
466 static int compare_sysfs_attribute(struct sysfs_class_device
*class_dev
, struct sysfs_device
*sysfs_device
, struct sysfs_pair
*pair
)
468 struct sysfs_attribute
*tmpattr
;
472 if ((pair
== NULL
) || (pair
->file
[0] == '\0') || (pair
->value
== '\0'))
475 tmpattr
= find_sysfs_attribute(class_dev
, sysfs_device
, pair
->file
);
479 /* strip trailing whitespace of value, if not asked to match for it */
480 if (! isspace(pair
->value
[strlen(pair
->value
)-1])) {
481 i
= len
= strlen(tmpattr
->value
);
482 while (i
> 0 && isspace(tmpattr
->value
[i
-1]))
485 tmpattr
->value
[i
] = '\0';
486 dbg("remove %i trailing whitespace chars from '%s'",
487 len
- i
, tmpattr
->value
);
491 dbg("compare attribute '%s' value '%s' with '%s'",
492 pair
->file
, tmpattr
->value
, pair
->value
);
493 if (strcmp_pattern(pair
->value
, tmpattr
->value
) != 0)
496 dbg("found matching attribute '%s' with value '%s'",
497 pair
->file
, pair
->value
);
501 static int match_sysfs_pairs(struct config_device
*dev
, struct sysfs_class_device
*class_dev
, struct sysfs_device
*sysfs_device
)
503 struct sysfs_pair
*pair
;
506 for (i
= 0; i
< MAX_SYSFS_PAIRS
; ++i
) {
507 pair
= &dev
->sysfs_pair
[i
];
508 if ((pair
->file
[0] == '\0') || (pair
->value
[0] == '\0'))
510 if (compare_sysfs_attribute(class_dev
, sysfs_device
, pair
) != 0) {
511 dbg("sysfs attribute doesn't match");
519 static int match_id(struct config_device
*dev
, struct sysfs_device
*sysfs_device
)
521 char path
[PATH_SIZE
];
524 strlcpy(path
, sysfs_device
->path
, sizeof(path
));
525 temp
= strrchr(path
, '/');
527 dbg("search '%s' in '%s', path='%s'", dev
->id
, temp
, path
);
528 if (strcmp_pattern(dev
->id
, temp
) != 0)
534 static int match_place(struct config_device
*dev
, struct sysfs_device
*sysfs_device
)
536 char path
[PATH_SIZE
];
539 strlcpy(path
, sysfs_device
->path
, sizeof(path
));
540 temp
= strrchr(path
, '/');
541 dbg("search '%s' in '%s', path='%s'", dev
->place
, temp
, path
);
542 if (strstr(temp
, dev
->place
) != NULL
)
547 temp
= strrchr(path
, '/');
548 dbg("search '%s' in '%s', path='%s'", dev
->place
, temp
, path
);
549 if (strstr(temp
, dev
->place
) == NULL
)
552 dbg("place doesn't match");
556 static int match_rule(struct udevice
*udev
, struct config_device
*dev
,
557 struct sysfs_class_device
*class_dev
, struct sysfs_device
*sysfs_device
)
559 if (dev
->kernel
[0] != '\0') {
560 dbg("check for " FIELD_KERNEL
" dev->kernel='%s' class_dev->name='%s'",
561 dev
->kernel
, class_dev
->name
);
562 if (strcmp_pattern(dev
->kernel
, class_dev
->name
) != 0) {
563 dbg(FIELD_KERNEL
" is not matching");
566 dbg(FIELD_KERNEL
" matches");
569 if (dev
->subsystem
[0] != '\0') {
570 dbg("check for " FIELD_SUBSYSTEM
" dev->subsystem='%s' class_dev->name='%s'",
571 dev
->subsystem
, class_dev
->name
);
572 if (strcmp_pattern(dev
->subsystem
, udev
->subsystem
) != 0) {
573 dbg(FIELD_SUBSYSTEM
" is not matching");
576 dbg(FIELD_SUBSYSTEM
" matches");
579 /* walk up the chain of physical devices and find a match */
581 /* check for matching driver */
582 if (dev
->driver
[0] != '\0') {
583 if (sysfs_device
== NULL
) {
584 dbg("device has no sysfs_device");
587 dbg("check for " FIELD_DRIVER
" dev->driver='%s' sysfs_device->driver_name='%s'",
588 dev
->driver
, sysfs_device
->driver_name
);
589 if (strcmp_pattern(dev
->driver
, sysfs_device
->driver_name
) != 0) {
590 dbg(FIELD_DRIVER
" is not matching");
593 dbg(FIELD_DRIVER
" matches");
596 /* check for matching bus value */
597 if (dev
->bus
[0] != '\0') {
598 if (sysfs_device
== NULL
) {
599 dbg("device has no sysfs_device");
602 dbg("check for " FIELD_BUS
" dev->bus='%s' sysfs_device->bus='%s'",
603 dev
->bus
, sysfs_device
->bus
);
604 if (strcmp_pattern(dev
->bus
, sysfs_device
->bus
) != 0) {
605 dbg(FIELD_BUS
" is not matching");
608 dbg(FIELD_BUS
" matches");
611 /* check for matching bus id */
612 if (dev
->id
[0] != '\0') {
613 if (sysfs_device
== NULL
) {
614 dbg("device has no sysfs_device");
617 dbg("check " FIELD_ID
);
618 if (match_id(dev
, sysfs_device
) != 0) {
619 dbg(FIELD_ID
" is not matching");
622 dbg(FIELD_ID
" matches");
625 /* check for matching place of device */
626 if (dev
->place
[0] != '\0') {
627 if (sysfs_device
== NULL
) {
628 dbg("device has no sysfs_device");
631 dbg("check " FIELD_PLACE
);
632 if (match_place(dev
, sysfs_device
) != 0) {
633 dbg(FIELD_PLACE
" is not matching");
636 dbg(FIELD_PLACE
" matches");
639 /* check for matching sysfs pairs */
640 if (dev
->sysfs_pair
[0].file
[0] != '\0') {
641 dbg("check " FIELD_SYSFS
" pairs");
642 if (match_sysfs_pairs(dev
, class_dev
, sysfs_device
) != 0) {
643 dbg(FIELD_SYSFS
" is not matching");
646 dbg(FIELD_SYSFS
" matches");
649 /* found matching physical device */
652 dbg("try parent sysfs device");
653 sysfs_device
= sysfs_get_device_parent(sysfs_device
);
654 if (sysfs_device
== NULL
)
656 dbg("sysfs_device->path='%s'", sysfs_device
->path
);
657 dbg("sysfs_device->bus_id='%s'", sysfs_device
->bus_id
);
660 /* execute external program */
661 if (dev
->program
[0] != '\0') {
662 char program
[PATH_SIZE
];
664 dbg("check " FIELD_PROGRAM
);
665 strlcpy(program
, dev
->program
, sizeof(program
));
666 apply_format(udev
, program
, sizeof(program
), class_dev
, sysfs_device
);
667 if (execute_program(udev
, program
, udev
->program_result
, sizeof(udev
->program_result
)) != 0) {
668 dbg(FIELD_PROGRAM
" returned nonzero");
671 dbg(FIELD_PROGRAM
" returned successful");
674 /* check for matching result of external program */
675 if (dev
->result
[0] != '\0') {
676 dbg("check for " FIELD_RESULT
" dev->result='%s', udev->program_result='%s'",
677 dev
->result
, udev
->program_result
);
678 if (strcmp_pattern(dev
->result
, udev
->program_result
) != 0) {
679 dbg(FIELD_RESULT
" is not matching");
682 dbg(FIELD_RESULT
" matches");
692 int namedev_name_device(struct udevice
*udev
, struct sysfs_class_device
*class_dev
)
694 struct sysfs_class_device
*class_dev_parent
;
695 struct sysfs_device
*sysfs_device
= NULL
;
696 struct config_device
*dev
;
698 dbg("class_dev->name='%s'", class_dev
->name
);
700 /* Figure out where the "device"-symlink is at. For char devices this will
701 * always be in the class_dev->path. On block devices, only the main block
702 * device will have the device symlink in it's path. All partition devices
703 * need to look at the symlink in its parent directory.
705 class_dev_parent
= sysfs_get_classdev_parent(class_dev
);
706 if (class_dev_parent
!= NULL
) {
707 dbg("given class device has a parent, use this instead");
708 sysfs_device
= sysfs_get_classdev_device(class_dev_parent
);
710 sysfs_device
= sysfs_get_classdev_device(class_dev
);
714 dbg("found devices device: path='%s', bus_id='%s', bus='%s'",
715 sysfs_device
->path
, sysfs_device
->bus_id
, sysfs_device
->bus
);
716 strlcpy(udev
->bus_id
, sysfs_device
->bus_id
, sizeof(udev
->bus_id
));
719 dbg("udev->kernel_name='%s'", udev
->kernel_name
);
721 /* look for a matching rule to apply */
722 list_for_each_entry(dev
, &config_device_list
, node
) {
724 if (match_rule(udev
, dev
, class_dev
, sysfs_device
) == 0) {
727 if (dev
->ignore_device
) {
728 info("configured rule in '%s[%i]' applied, '%s' is ignored",
729 dev
->config_file
, dev
->config_line
, udev
->kernel_name
);
732 if (dev
->ignore_remove
) {
733 udev
->ignore_remove
= 1;
734 dbg_parse("remove event should be ignored");
736 /* apply all_partitions option only at a main block device */
737 if (dev
->partitions
&& udev
->type
== BLOCK
&& udev
->kernel_number
[0] == '\0') {
738 udev
->partitions
= dev
->partitions
;
739 dbg("creation of partition nodes requested");
742 /* apply permissions */
743 if (dev
->mode
!= 0000) {
744 udev
->mode
= dev
->mode
;
745 dbg("applied mode=%#o to '%s'", udev
->mode
, udev
->kernel_name
);
747 if (dev
->owner
[0] != '\0') {
748 strlcpy(udev
->owner
, dev
->owner
, sizeof(udev
->owner
));
749 apply_format(udev
, udev
->owner
, sizeof(udev
->owner
), class_dev
, sysfs_device
);
750 dbg("applied owner='%s' to '%s'", udev
->owner
, udev
->kernel_name
);
752 if (dev
->group
[0] != '\0') {
753 strlcpy(udev
->group
, dev
->group
, sizeof(udev
->group
));
754 apply_format(udev
, udev
->group
, sizeof(udev
->group
), class_dev
, sysfs_device
);
755 dbg("applied group='%s' to '%s'", udev
->group
, udev
->kernel_name
);
758 /* collect symlinks */
759 if (dev
->symlink
[0] != '\0') {
760 char temp
[PATH_SIZE
];
763 info("configured rule in '%s[%i]' applied, added symlink '%s'",
764 dev
->config_file
, dev
->config_line
, dev
->symlink
);
765 strlcpy(temp
, dev
->symlink
, sizeof(temp
));
766 apply_format(udev
, temp
, sizeof(temp
), class_dev
, sysfs_device
);
768 /* add multiple symlinks separated by spaces */
770 next
= strchr(temp
, ' ');
773 dbg("add symlink '%s'", pos
);
774 name_list_add(&udev
->symlink_list
, pos
, 0);
776 next
= strchr(pos
, ' ');
778 dbg("add symlink '%s'", pos
);
779 name_list_add(&udev
->symlink_list
, pos
, 0);
783 if (dev
->name
[0] != '\0') {
784 info("configured rule in '%s[%i]' applied, '%s' becomes '%s'",
785 dev
->config_file
, dev
->config_line
, udev
->kernel_name
, dev
->name
);
787 strlcpy(udev
->name
, dev
->name
, sizeof(udev
->name
));
788 apply_format(udev
, udev
->name
, sizeof(udev
->name
), class_dev
, sysfs_device
);
789 strlcpy(udev
->config_file
, dev
->config_file
, sizeof(udev
->config_file
));
790 udev
->config_line
= dev
->config_line
;
792 if (udev
->type
!= NET
)
793 dbg("name, '%s' is going to have owner='%s', group='%s', mode=%#o partitions=%i",
794 udev
->name
, udev
->owner
, udev
->group
, udev
->mode
, udev
->partitions
);
801 if (udev
->name
[0] == '\0') {
802 /* no rule matched, so we use the kernel name */
803 strlcpy(udev
->name
, udev
->kernel_name
, sizeof(udev
->name
));
804 dbg("no rule found, use kernel name '%s'", udev
->name
);
807 if (udev
->tmp_node
[0] != '\0') {
808 dbg("removing temporary device node");
809 unlink_secure(udev
->tmp_node
);
810 udev
->tmp_node
[0] = '\0';