]>
git.ipfire.org Git - thirdparty/systemd.git/blob - namedev.c
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.
36 #include <sys/sysinfo.h>
39 #include "libsysfs/sysfs/libsysfs.h"
43 #include "udev_version.h"
46 #include "klibc_fixups.h"
48 static struct sysfs_attribute
*find_sysfs_attribute(struct sysfs_class_device
*class_dev
, struct sysfs_device
*sysfs_device
, char *attr
);
50 LIST_HEAD(config_device_list
);
51 LIST_HEAD(perm_device_list
);
54 /* compare string with pattern (supports * ? [0-9] [!A-Z]) */
55 static int strcmp_pattern(const char *p
, const char *s
)
60 return (p
[0] != '\0');
71 while ((p
[0] != '\0') && (p
[0] != ']')) {
74 if ((s
[0] >= p
[0]) && (s
[0] <= p
[2]))
78 match
= (p
[0] == s
[0]);
82 while ((p
[0] != '\0') && (p
[0] != ']'))
85 return strcmp_pattern(p
+1, s
+1);
91 if (strcmp_pattern(p
, s
+1))
92 return strcmp_pattern(p
+1, s
);
100 if ((p
[0] == s
[0]) || (p
[0] == '?'))
101 return strcmp_pattern(p
+1, s
+1);
107 static struct perm_device
*find_perm(char *name
)
109 struct perm_device
*perm
;
111 list_for_each_entry(perm
, &perm_device_list
, node
) {
112 if (strcmp_pattern(perm
->name
, name
))
119 static mode_t
get_default_mode(void)
121 mode_t mode
= 0600; /* default to owner rw only */
123 if (strlen(default_mode_str
) != 0)
124 mode
= strtol(default_mode_str
, NULL
, 8);
129 static char *get_default_owner(void)
131 if (strlen(default_owner_str
) == 0)
132 strfieldcpy(default_owner_str
, "root");
134 return default_owner_str
;
137 static char *get_default_group(void)
139 if (strlen(default_group_str
) == 0)
140 strfieldcpy(default_group_str
, "root");
142 return default_group_str
;
145 /* extract possible {attr} and move str behind it */
146 static char *get_format_attribute(char **str
)
151 if (*str
[0] == '{') {
152 pos
= strchr(*str
, '}');
154 dbg("missing closing brace for format");
160 dbg("attribute='%s', str='%s'", attr
, *str
);
165 /* extract possible format length and move str behind it*/
166 static int get_format_len(char **str
)
171 if (isdigit(*str
[0])) {
172 num
= (int) strtoul(*str
, &tail
, 10);
175 dbg("format length=%i", num
);
178 dbg("format parsing error '%s'", *str
);
184 static void apply_format(struct udevice
*udev
, char *string
, size_t maxsize
,
185 struct sysfs_class_device
*class_dev
,
186 struct sysfs_device
*sysfs_device
)
188 char temp
[NAME_SIZE
];
189 char temp2
[NAME_SIZE
];
199 struct sysfs_attribute
*tmpattr
;
204 pos
= strchr(string
, '%');
208 len
= get_format_len(&tail
);
210 strfieldcpy(temp
, tail
+1);
215 dbg("format=%c, string='%s', tail='%s'",c
, string
, tail
);
217 attr
= get_format_attribute(&tail
);
221 if (strlen(udev
->bus_id
) == 0)
223 strfieldcatmax(string
, udev
->bus_id
, maxsize
);
224 dbg("substitute bus_id '%s'", udev
->bus_id
);
227 if (strlen(udev
->kernel_name
) == 0)
229 strfieldcatmax(string
, udev
->kernel_name
, maxsize
);
230 dbg("substitute kernel name '%s'", udev
->kernel_name
);
233 if (strlen(udev
->kernel_number
) == 0)
235 strfieldcatmax(string
, udev
->kernel_number
, maxsize
);
236 dbg("substitute kernel number '%s'", udev
->kernel_number
);
239 strintcatmax(string
, udev
->minor
, maxsize
);
240 dbg("substitute minor number '%u'", udev
->minor
);
243 strintcatmax(string
, udev
->major
, maxsize
);
244 dbg("substitute major number '%u'", udev
->major
);
247 if (strlen(udev
->program_result
) == 0)
249 /* get part part of the result string */
252 i
= strtoul(attr
, &rest
, 10);
254 foreach_strpart(udev
->program_result
, " \n\r", spos
, slen
) {
260 dbg("requested part of result string not found");
264 strfieldcpy(temp2
, spos
);
266 strfieldcpymax(temp2
, spos
, slen
+1);
267 strfieldcatmax(string
, temp2
, maxsize
);
268 dbg("substitute part of result string '%s'", temp2
);
270 strfieldcatmax(string
, udev
->program_result
, maxsize
);
271 dbg("substitute result string '%s'", udev
->program_result
);
276 tmpattr
= find_sysfs_attribute(class_dev
, sysfs_device
, attr
);
277 if (tmpattr
== NULL
) {
278 dbg("sysfa attribute '%s' not found", attr
);
281 strfieldcatmax(string
, tmpattr
->value
, maxsize
);
282 dbg("substitute sysfs value '%s'", tmpattr
->value
);
284 dbg("missing attribute");
288 strfieldcatmax(string
, "%", maxsize
);
291 dbg("unknown substitution type '%%%c'", c
);
294 /* truncate to specified length */
298 strfieldcatmax(string
, tail
, maxsize
);
303 * Note, we can have multiple files for different busses in here due
304 * to the mess that USB has for its device tree...
306 static struct bus_file
{
310 { .bus
= "scsi", .file
= "vendor" },
311 { .bus
= "usb", .file
= "idVendor" },
312 { .bus
= "usb", .file
= "iInterface" },
313 { .bus
= "usb-serial", .file
= "detach_state" },
314 { .bus
= "ide", .file
= "detach_state" },
315 { .bus
= "pci", .file
= "vendor" },
319 #define SECONDS_TO_WAIT_FOR_FILE 10
320 static void wait_for_device_to_initialize(struct sysfs_device
*sysfs_device
)
322 /* sleep until we see the file for this specific bus type show up this
323 * is needed because we can easily out-run the kernel in looking for
324 * these files before the paticular subsystem has created them in the
325 * sysfs tree properly.
327 * And people thought that the /sbin/hotplug event system was going to
328 * be slow, poo on you for arguing that before even testing it...
330 struct bus_file
*b
= &bus_files
[0];
331 struct sysfs_attribute
*tmpattr
;
333 int loop
= SECONDS_TO_WAIT_FOR_FILE
;
336 if (b
->bus
== NULL
) {
339 /* sleep to give the kernel a chance to create the file */
346 if (strcmp(sysfs_device
->bus
, b
->bus
) == 0) {
348 dbg("looking for file '%s' on bus '%s'", b
->file
, b
->bus
);
349 tmpattr
= sysfs_get_device_attr(sysfs_device
, b
->file
);
354 dbg("can't find '%s' file", b
->file
);
359 dbg("did not find bus type '%s' on list of bus_id_files, "
360 "contact greg@kroah.com", sysfs_device
->bus
);
362 return; /* here to prevent compiler warning... */
365 static void fix_kernel_name(struct udevice
*udev
)
367 char *temp
= udev
->kernel_name
;
369 while (*temp
!= 0x00) {
370 /* Some block devices have a ! in their name,
371 * we need to change that to / */
378 static int execute_program(char *path
, char *value
, int len
)
386 char arg
[PROGRAM_SIZE
];
387 char *argv
[sizeof(arg
) / 2];
391 if (strchr(path
, ' ')) {
392 strfieldcpy(arg
, path
);
394 while (pos
!= NULL
) {
395 if (pos
[0] == '\'') {
396 /* don't separate if in apostrophes */
398 argv
[i
] = strsep(&pos
, "\'");
399 while (pos
[0] == ' ')
402 argv
[i
] = strsep(&pos
, " ");
404 dbg("arg[%i] '%s'", i
, argv
[i
]);
420 close(STDOUT_FILENO
);
422 /* dup write side of pipe to STDOUT */
424 if (argv
[0] != NULL
) {
425 dbg("execute '%s' with given arguments", argv
[0]);
426 retval
= execv(argv
[0], argv
);
428 dbg("execute '%s' with main argument", path
);
429 retval
= execv(path
, main_argv
);
432 info(FIELD_PROGRAM
" execution of '%s' failed", path
);
438 /* parent reads from fds[0] */
443 count
= read(fds
[0], value
+ i
, len
- i
-1);
449 dbg("result len %d too short", len
);
456 dbg("read failed with '%s'", strerror(errno
));
460 if (i
> 0 && value
[i
-1] == '\n')
463 dbg("result is '%s'", value
);
468 if (!WIFEXITED(status
) || (WEXITSTATUS(status
) != 0)) {
469 dbg("exec program status 0x%x", status
);
476 static struct sysfs_attribute
*find_sysfs_attribute(struct sysfs_class_device
*class_dev
, struct sysfs_device
*sysfs_device
, char *attr
)
478 struct sysfs_attribute
*tmpattr
= NULL
;
481 dbg("look for device attribute '%s'", attr
);
482 /* try to find the attribute in the class device directory */
483 tmpattr
= sysfs_get_classdev_attr(class_dev
, attr
);
487 /* look in the class device directory if present */
489 tmpattr
= sysfs_get_device_attr(sysfs_device
, attr
);
497 c
= strchr(tmpattr
->value
, '\n');
501 dbg("found attribute '%s'", tmpattr
->path
);
505 static int compare_sysfs_attribute(struct sysfs_class_device
*class_dev
, struct sysfs_device
*sysfs_device
, struct sysfs_pair
*pair
)
507 struct sysfs_attribute
*tmpattr
;
511 if ((pair
== NULL
) || (pair
->file
[0] == '\0') || (pair
->value
== '\0'))
514 tmpattr
= find_sysfs_attribute(class_dev
, sysfs_device
, pair
->file
);
518 /* strip trailing whitespace of value, if not asked to match for it */
519 if (! isspace(pair
->value
[strlen(pair
->value
)-1])) {
520 i
= len
= strlen(tmpattr
->value
);
521 while (i
> 0 && isspace(tmpattr
->value
[i
-1]))
524 tmpattr
->value
[i
] = '\0';
525 dbg("remove %i trailing whitespace chars from '%s'",
526 len
- i
, tmpattr
->value
);
530 dbg("compare attribute '%s' value '%s' with '%s'",
531 pair
->file
, tmpattr
->value
, pair
->value
);
532 if (strcmp_pattern(pair
->value
, tmpattr
->value
) != 0)
535 dbg("found matching attribute '%s' with value '%s'",
536 pair
->file
, pair
->value
);
540 static int match_sysfs_pairs(struct config_device
*dev
, struct sysfs_class_device
*class_dev
, struct sysfs_device
*sysfs_device
)
542 struct sysfs_pair
*pair
;
545 for (i
= 0; i
< MAX_SYSFS_PAIRS
; ++i
) {
546 pair
= &dev
->sysfs_pair
[i
];
547 if ((pair
->file
[0] == '\0') || (pair
->value
[0] == '\0'))
549 if (compare_sysfs_attribute(class_dev
, sysfs_device
, pair
) != 0) {
550 dbg("sysfs attribute doesn't match");
558 static int match_id(struct config_device
*dev
, struct sysfs_class_device
*class_dev
, struct sysfs_device
*sysfs_device
)
560 char path
[SYSFS_PATH_MAX
];
563 /* we have to have a sysfs device for ID to work */
567 strfieldcpy(path
, sysfs_device
->path
);
568 temp
= strrchr(path
, '/');
570 dbg("search '%s' in '%s', path='%s'", dev
->id
, temp
, path
);
571 if (strcmp_pattern(dev
->id
, temp
) != 0)
577 static int match_place(struct config_device
*dev
, struct sysfs_class_device
*class_dev
, struct sysfs_device
*sysfs_device
)
579 char path
[SYSFS_PATH_MAX
];
583 /* we have to have a sysfs device for PLACE to work */
588 strfieldcpy(path
, sysfs_device
->path
);
589 temp
= strrchr(path
, '/');
590 dbg("search '%s' in '%s', path='%s'", dev
->place
, temp
, path
);
591 if (strstr(temp
, dev
->place
) != NULL
) {
595 temp
= strrchr(path
, '/');
596 dbg("search '%s' in '%s', path='%s'", dev
->place
, temp
, path
);
597 if (strstr(temp
, dev
->place
) != NULL
)
601 dbg("place doesn't match");
608 static struct sysfs_device
*get_sysfs_device(struct sysfs_class_device
*class_dev
)
610 struct sysfs_device
*sysfs_device
;
611 struct sysfs_class_device
*class_dev_parent
;
612 struct timespec tspec
;
615 /* Figure out where the device symlink is at. For char devices this will
616 * always be in the class_dev->path. But for block devices, it's different.
617 * The main block device will have the device symlink in it's path, but
618 * all partitions have the symlink in its parent directory.
619 * But we need to watch out for block devices that do not have parents, yet
620 * look like a partition (fd0, loop0, etc.) They all do not have a device
621 * symlink yet. We do sit and spin on waiting for them right now, we should
622 * possibly have a whitelist for these devices here...
624 class_dev_parent
= sysfs_get_classdev_parent(class_dev
);
625 if (class_dev_parent
!= NULL
)
626 dbg("given class device has a parent, use this instead");
629 tspec
.tv_nsec
= 10000000; /* sleep 10 millisec */
633 nanosleep(&tspec
, NULL
);
635 if (class_dev_parent
)
636 sysfs_device
= sysfs_get_classdev_device(class_dev_parent
);
638 sysfs_device
= sysfs_get_classdev_device(class_dev
);
639 if (sysfs_device
!= NULL
)
642 dbg("timed out waiting for device symlink, continuing on anyway...");
645 /* We have another issue with just the wait above - the sysfs part of
646 * the kernel may not be quick enough to have created the link to the
647 * device under the "bus" subsystem. Due to this, the sysfs_device->bus
648 * will not contain the actual bus name :(
651 if (sysfs_device
->bus
[0] != '\0')
655 tspec
.tv_nsec
= 10000000;
658 nanosleep(&tspec
, NULL
);
659 sysfs_get_device_bus(sysfs_device
);
661 if (sysfs_device
->bus
[0] != '\0')
664 dbg("timed out waiting to find the device bus, continuing on anyway");
667 dbg("device %s is registered with bus '%s'",
668 sysfs_device
->name
, sysfs_device
->bus
);
674 static int match_rule(struct config_device
*dev
, struct sysfs_class_device
*class_dev
, struct udevice
*udev
, struct sysfs_device
*sysfs_device
)
677 /* check for matching bus value */
678 if (dev
->bus
[0] != '\0') {
679 if (sysfs_device
== NULL
) {
680 dbg("device has no bus");
683 dbg("check for " FIELD_BUS
" dev->bus='%s' sysfs_device->bus='%s'", dev
->bus
, sysfs_device
->bus
);
684 if (strcmp_pattern(dev
->bus
, sysfs_device
->bus
) != 0) {
685 dbg(FIELD_BUS
" is not matching");
688 dbg(FIELD_BUS
" matches");
692 /* check for matching kernel name*/
693 if (dev
->kernel
[0] != '\0') {
694 dbg("check for " FIELD_KERNEL
" dev->kernel='%s' class_dev->name='%s'", dev
->kernel
, class_dev
->name
);
695 if (strcmp_pattern(dev
->kernel
, class_dev
->name
) != 0) {
696 dbg(FIELD_KERNEL
" is not matching");
699 dbg(FIELD_KERNEL
" matches");
703 /* check for matching bus id */
704 if (dev
->id
[0] != '\0') {
705 dbg("check " FIELD_ID
);
706 if (match_id(dev
, class_dev
, sysfs_device
) != 0) {
707 dbg(FIELD_ID
" is not matching");
710 dbg(FIELD_ID
" matches");
714 /* check for matching place of device */
715 if (dev
->place
[0] != '\0') {
716 dbg("check " FIELD_PLACE
);
717 if (match_place(dev
, class_dev
, sysfs_device
) != 0) {
718 dbg(FIELD_PLACE
" is not matching");
721 dbg(FIELD_PLACE
" matches");
725 /* check for matching sysfs pairs */
726 if (dev
->sysfs_pair
[0].file
[0] != '\0') {
727 dbg("check " FIELD_SYSFS
" pairs");
728 if (match_sysfs_pairs(dev
, class_dev
, sysfs_device
) != 0) {
729 dbg(FIELD_SYSFS
" is not matching");
732 dbg(FIELD_SYSFS
" matches");
736 /* execute external program */
737 if (dev
->program
[0] != '\0') {
738 dbg("check " FIELD_PROGRAM
);
739 apply_format(udev
, dev
->program
, sizeof(dev
->program
),
740 class_dev
, sysfs_device
);
741 if (execute_program(dev
->program
, udev
->program_result
, NAME_SIZE
) != 0) {
742 dbg(FIELD_PROGRAM
" returned nonzero");
745 dbg(FIELD_PROGRAM
" returned successful");
749 /* check for matching result of external program */
750 if (dev
->result
[0] != '\0') {
751 dbg("check for " FIELD_RESULT
752 " dev->result='%s', udev->program_result='%s'",
753 dev
->result
, udev
->program_result
);
754 if (strcmp_pattern(dev
->result
, udev
->program_result
) != 0) {
755 dbg(FIELD_RESULT
" is not matching");
758 dbg(FIELD_RESULT
" matches");
762 /* Yeah, we matched! */
766 dbg("try parent sysfs device");
767 sysfs_device
= sysfs_get_device_parent(sysfs_device
);
768 if (sysfs_device
== NULL
)
770 dbg("sysfs_device->path='%s'", sysfs_device
->path
);
771 dbg("sysfs_device->bus_id='%s'", sysfs_device
->bus_id
);
772 dbg("sysfs_device->bus='%s'", sysfs_device
->bus
);
777 int namedev_name_device(struct sysfs_class_device
*class_dev
, struct udevice
*udev
)
779 struct sysfs_device
*sysfs_device
= NULL
;
780 struct config_device
*dev
;
781 struct perm_device
*perm
;
787 /* find the sysfs_device associated with this class device */
788 sysfs_device
= get_sysfs_device(class_dev
);
790 dbg("sysfs_device->path='%s'", sysfs_device
->path
);
791 dbg("sysfs_device->bus_id='%s'", sysfs_device
->bus_id
);
792 dbg("sysfs_device->bus='%s'", sysfs_device
->bus
);
793 strfieldcpy(udev
->bus_id
, sysfs_device
->bus_id
);
794 wait_for_device_to_initialize(sysfs_device
);
796 dbg("class_dev->name = '%s'", class_dev
->name
);
798 strfieldcpy(udev
->kernel_name
, class_dev
->name
);
799 fix_kernel_name(udev
);
800 dbg("udev->kernel_name = '%s'", udev
->kernel_name
);
802 /* get kernel number */
803 pos
= class_dev
->name
+ strlen(class_dev
->name
);
804 while (isdigit(*(pos
-1)))
806 strfieldcpy(udev
->kernel_number
, pos
);
807 dbg("kernel_number='%s'", udev
->kernel_number
);
809 /* look for a matching rule to apply */
810 list_for_each_entry(dev
, &config_device_list
, node
) {
812 if (match_rule(dev
, class_dev
, udev
, sysfs_device
) == 0) {
813 if (dev
->name
[0] == '\0' && dev
->symlink
[0] == '\0') {
814 info("configured rule in '%s' at line %i applied, '%s' is ignored",
815 dev
->config_file
, dev
->config_line
, udev
->kernel_name
);
819 if (dev
->symlink
[0] != '\0') {
820 char temp
[NAME_SIZE
];
822 info("configured rule in '%s' at line %i applied, added symlink '%s'",
823 dev
->config_file
, dev
->config_line
, dev
->symlink
);
824 strfieldcpy(temp
, dev
->symlink
);
825 apply_format(udev
, temp
, sizeof(temp
), class_dev
, sysfs_device
);
826 if (udev
->symlink
[0] != '\0')
827 strfieldcat(udev
->symlink
, " ");
828 strfieldcat(udev
->symlink
, temp
);
831 if (dev
->name
[0] != '\0') {
832 /* apply all_partitions flag only at a main block device */
833 if (dev
->partitions
> 0 &&
834 (udev
->type
!= 'b' || udev
->kernel_number
[0] != '\0'))
837 info("configured rule in '%s' at line %i applied, '%s' becomes '%s'",
838 dev
->config_file
, dev
->config_line
, udev
->kernel_name
, dev
->name
);
839 strfieldcpy(udev
->name
, dev
->name
);
844 /* no rule was found so we use the kernel name */
845 strfieldcpy(udev
->name
, udev
->kernel_name
);
846 if (udev
->type
== 'n')
852 apply_format(udev
, udev
->name
, sizeof(udev
->name
), class_dev
, sysfs_device
);
854 if (udev
->type
== 'n')
857 udev
->partitions
= dev
->partitions
;
858 strfieldcpy(udev
->config_file
, dev
->config_file
);
859 udev
->config_line
= dev
->config_line
;
861 /* get permissions given in rule */
862 set_empty_perms(udev
, dev
->mode
,
867 /* get permissions given in config file or set defaults */
868 perm
= find_perm(udev
->name
);
870 set_empty_perms(udev
, perm
->mode
,
874 set_empty_perms(udev
, get_default_mode(),
876 get_default_group());
879 dbg("name, '%s' is going to have owner='%s', group='%s', mode = %#o",
880 udev
->name
, udev
->owner
, udev
->group
, udev
->mode
);
883 /* store time of action */
885 udev
->config_uptime
= info
.uptime
;
890 int namedev_init(void)
894 retval
= namedev_init_rules();
898 retval
= namedev_init_permissions();
902 dump_config_dev_list();
903 dump_perm_dev_list();