]>
git.ipfire.org Git - thirdparty/systemd.git/blob - namedev.c
018fd452e99096edc05207f47fbbda2bbea7e8e2
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"
41 #include "libsysfs/libsysfs.h"
42 #include "klibc_fixups.h"
44 LIST_HEAD(config_device_list
);
45 LIST_HEAD(perm_device_list
);
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 #define copy_var(a, b, var) \
104 #define copy_string(a, b, var) \
105 if (strlen(b->var)) \
106 strcpy(a->var, b->var);
108 int add_perm_dev(struct perm_device
*new_dev
)
110 struct perm_device
*dev
;
111 struct perm_device
*tmp_dev
;
113 /* update the values if we already have the device */
114 list_for_each_entry(dev
, &perm_device_list
, node
) {
115 if (strcmp(new_dev
->name
, dev
->name
))
117 copy_var(dev
, new_dev
, mode
);
118 copy_string(dev
, new_dev
, owner
);
119 copy_string(dev
, new_dev
, group
);
123 /* not found, add new structure to the perm list */
124 tmp_dev
= malloc(sizeof(*tmp_dev
));
127 memcpy(tmp_dev
, new_dev
, sizeof(*tmp_dev
));
128 list_add_tail(&tmp_dev
->node
, &perm_device_list
);
129 //dump_perm_dev(tmp_dev);
133 static struct perm_device
*find_perm(char *name
)
135 struct perm_device
*perm
;
137 list_for_each_entry(perm
, &perm_device_list
, node
) {
138 if (strcmp_pattern(perm
->name
, name
))
145 static mode_t
get_default_mode(void)
147 mode_t mode
= 0600; /* default to owner rw only */
149 if (strlen(default_mode_str
) != 0)
150 mode
= strtol(default_mode_str
, NULL
, 8);
155 static char *get_default_owner(void)
157 if (strlen(default_owner_str
) == 0)
158 strncpy(default_owner_str
, "root", OWNER_SIZE
);
160 return default_owner_str
;
163 static char *get_default_group(void)
165 if (strlen(default_group_str
) == 0)
166 strncpy(default_group_str
, "root", GROUP_SIZE
);
168 return default_group_str
;
171 static void apply_format(struct udevice
*udev
, unsigned char *string
)
173 char temp
[NAME_SIZE
];
174 char temp1
[NAME_SIZE
];
184 pos
= strchr(pos
, '%');
189 if (isdigit(tail
[0])) {
190 num
= (int) strtoul(&pos
[1], &tail
, 10);
192 dbg("format parsing error '%s'", pos
+1);
196 strfieldcpy(temp
, tail
+1);
200 if (strlen(udev
->bus_id
) == 0)
202 strcat(pos
, udev
->bus_id
);
203 dbg("substitute bus_id '%s'", udev
->bus_id
);
206 if (strlen(udev
->kernel_name
) == 0)
208 strcat(pos
, udev
->kernel_name
);
209 dbg("substitute kernel name '%s'", udev
->kernel_name
);
212 if (strlen(udev
->kernel_number
) == 0)
214 strcat(pos
, udev
->kernel_number
);
215 dbg("substitute kernel number '%s'", udev
->kernel_number
);
218 sprintf(pos
, "%u", udev
->minor
);
219 dbg("substitute minor number '%u'", udev
->minor
);
222 sprintf(pos
, "%u", udev
->major
);
223 dbg("substitute major number '%u'", udev
->major
);
226 if (strlen(udev
->program_result
) == 0)
229 /* get part of return string */
230 strncpy(temp1
, udev
->program_result
, sizeof(temp1
));
234 pos3
= strsep(&pos2
, " ");
236 dbg("requested part of result string not found");
242 dbg("substitute part of result string '%s'", pos3
);
245 strcat(pos
, udev
->program_result
);
246 dbg("substitute result string '%s'", udev
->program_result
);
254 dbg("unknown substitution type '%%%c'", pos
[1]);
257 strcat(string
, temp
);
264 * Note, we can have multiple files for different busses in here due
265 * to the mess that USB has for its device tree...
267 static struct bus_file
{
271 { .bus
= "scsi", .file
= "vendor" },
272 { .bus
= "usb", .file
= "idVendor" },
273 { .bus
= "usb", .file
= "iInterface" },
274 { .bus
= "usb-serial", .file
= "detach_state" },
275 { .bus
= "ide", .file
= "detach_state" },
276 { .bus
= "pci", .file
= "vendor" },
280 #define SECONDS_TO_WAIT_FOR_FILE 10
281 static void wait_for_device_to_initialize(struct sysfs_device
*sysfs_device
)
283 /* sleep until we see the file for this specific bus type show up this
284 * is needed because we can easily out-run the kernel in looking for
285 * these files before the paticular subsystem has created them in the
286 * sysfs tree properly.
288 * And people thought that the /sbin/hotplug event system was going to
289 * be slow, poo on you for arguing that before even testing it...
291 struct bus_file
*b
= &bus_files
[0];
292 struct sysfs_attribute
*tmpattr
;
294 int loop
= SECONDS_TO_WAIT_FOR_FILE
;
297 if (b
->bus
== NULL
) {
300 /* sleep to give the kernel a chance to create the file */
307 if (strcmp(sysfs_device
->bus
, b
->bus
) == 0) {
309 dbg("looking for file '%s' on bus '%s'", b
->file
, b
->bus
);
310 tmpattr
= sysfs_get_device_attr(sysfs_device
, b
->file
);
315 dbg("can't find '%s' file", b
->file
);
320 dbg("did not find bus type '%s' on list of bus_id_files, "
321 "contact greg@kroah.com", sysfs_device
->bus
);
323 return; /* here to prevent compiler warning... */
326 static void fix_kernel_name(struct udevice
*udev
)
328 char *temp
= udev
->kernel_name
;
330 while (*temp
!= 0x00) {
331 /* Some block devices have a ! in their name,
332 * we need to change that to / */
339 static int execute_program(char *path
, char *value
, int len
)
349 char *args
[PROGRAM_MAXARG
];
352 dbg("executing '%s'", path
);
362 close(STDOUT_FILENO
);
363 dup(fds
[1]); /* dup write side of pipe to STDOUT */
364 if (strchr(path
, ' ')) {
365 /* exec with arguments */
367 for (i
=0; i
< PROGRAM_MAXARG
-1; i
++) {
368 args
[i
] = strsep(&pos
, " ");
373 dbg("too many args - %d", i
);
376 retval
= execv(args
[0], args
);
378 retval
= execv(path
, main_argv
);
380 dbg("child execve failed");
386 /* parent reads from fds[0] */
390 res
= read(fds
[0], buffer
, sizeof(buffer
) - 1);
395 dbg("result len %d too short", len
);
399 dbg("result value already set");
403 strncpy(value
, buffer
, len
);
404 pos
= value
+ strlen(value
)-1;
407 dbg("result is '%s'", value
);
413 dbg("wait failed result %d", res
);
417 if (!WIFEXITED(status
) || (WEXITSTATUS(status
) != 0)) {
418 dbg("exec program status 0x%x", status
);
425 static int compare_sysfs_attribute(struct sysfs_class_device
*class_dev
, struct sysfs_device
*sysfs_device
, struct sysfs_pair
*pair
)
427 struct sysfs_attribute
*tmpattr
= NULL
;
430 if ((pair
== NULL
) || (pair
->file
[0] == '\0') || (pair
->value
== '\0'))
433 dbg("look for device attribute '%s'", pair
->file
);
434 /* try to find the attribute in the class device directory */
435 tmpattr
= sysfs_get_classdev_attr(class_dev
, pair
->file
);
439 /* look in the class device directory if present */
441 tmpattr
= sysfs_get_device_attr(sysfs_device
, pair
->file
);
448 c
= tmpattr
->value
+ strlen(tmpattr
->value
)-1;
451 dbg("compare attribute '%s' value '%s' with '%s'",
452 pair
->file
, tmpattr
->value
, pair
->value
);
453 if (strcmp_pattern(pair
->value
, tmpattr
->value
) != 0)
456 dbg("found matching attribute '%s' with value '%s'",
457 pair
->file
, pair
->value
);
461 static int match_sysfs_pairs(struct config_device
*dev
, struct sysfs_class_device
*class_dev
, struct sysfs_device
*sysfs_device
)
463 struct sysfs_pair
*pair
;
466 for (i
= 0; i
< MAX_SYSFS_PAIRS
; ++i
) {
467 pair
= &dev
->sysfs_pair
[i
];
468 if ((pair
->file
[0] == '\0') || (pair
->value
[0] == '\0'))
470 if (compare_sysfs_attribute(class_dev
, sysfs_device
, pair
) != 0) {
471 dbg("sysfs attribute doesn't match");
479 static int match_id(struct config_device
*dev
, struct sysfs_class_device
*class_dev
, struct sysfs_device
*sysfs_device
)
481 char path
[SYSFS_PATH_MAX
];
484 /* we have to have a sysfs device for ID to work */
488 strfieldcpy(path
, sysfs_device
->path
);
489 temp
= strrchr(path
, '/');
491 dbg("search '%s' in '%s', path='%s'", dev
->id
, temp
, path
);
492 if (strcmp_pattern(dev
->id
, temp
) != 0)
498 static int match_place(struct config_device
*dev
, struct sysfs_class_device
*class_dev
, struct sysfs_device
*sysfs_device
)
500 char path
[SYSFS_PATH_MAX
];
504 /* we have to have a sysfs device for PLACE to work */
509 strfieldcpy(path
, sysfs_device
->path
);
510 temp
= strrchr(path
, '/');
511 dbg("search '%s' in '%s', path='%s'", dev
->place
, temp
, path
);
512 if (strstr(temp
, dev
->place
) != NULL
) {
516 temp
= strrchr(path
, '/');
517 dbg("search '%s' in '%s', path='%s'", dev
->place
, temp
, path
);
518 if (strstr(temp
, dev
->place
) != NULL
)
522 dbg("place doesn't match");
529 static struct sysfs_device
*get_sysfs_device(struct sysfs_class_device
*class_dev
)
531 struct sysfs_device
*sysfs_device
;
532 struct sysfs_class_device
*class_dev_parent
;
533 struct timespec tspec
;
536 /* Figure out where the device symlink is at. For char devices this will
537 * always be in the class_dev->path. But for block devices, it's different.
538 * The main block device will have the device symlink in it's path, but
539 * all partitions have the symlink in its parent directory.
540 * But we need to watch out for block devices that do not have parents, yet
541 * look like a partition (fd0, loop0, etc.) They all do not have a device
542 * symlink yet. We do sit and spin on waiting for them right now, we should
543 * possibly have a whitelist for these devices here...
545 class_dev_parent
= sysfs_get_classdev_parent(class_dev
);
546 if (class_dev_parent
)
547 dbg("Really a partition");
550 tspec
.tv_nsec
= 10000000; /* sleep 10 millisec */
553 nanosleep(&tspec
, NULL
);
554 if (class_dev_parent
)
555 sysfs_device
= sysfs_get_classdev_device(class_dev_parent
);
557 sysfs_device
= sysfs_get_classdev_device(class_dev
);
559 if (sysfs_device
!= NULL
)
562 dbg("timed out waiting for device symlink, continuing on anyway...");
565 /* We have another issue with just the wait above - the sysfs part of
566 * the kernel may not be quick enough to have created the link to the
567 * device under the "bus" subsystem. Due to this, the sysfs_device->bus
568 * will not contain the actual bus name :(
570 * Libsysfs now provides a new API sysfs_get_device_bus(), so use it
574 if (sysfs_device
->bus
[0] != '\0')
578 tspec
.tv_nsec
= 10000000;
580 nanosleep(&tspec
, NULL
);
581 sysfs_get_device_bus(sysfs_device
);
583 if (sysfs_device
->bus
[0] != '\0')
586 dbg("timed out waiting to find the device bus, continuing on anyway");
589 dbg("device %s is registered with bus '%s'",
590 sysfs_device
->name
, sysfs_device
->bus
);
596 static int match_rule(struct config_device
*dev
, struct sysfs_class_device
*class_dev
, struct udevice
*udev
, struct sysfs_device
*sysfs_device
)
599 /* check for matching bus value */
600 if (dev
->bus
[0] != '\0') {
601 if (sysfs_device
== NULL
) {
602 dbg("device has no bus");
605 dbg("check for " FIELD_BUS
" dev->bus='%s' sysfs_device->bus='%s'", dev
->bus
, sysfs_device
->bus
);
606 if (strcmp_pattern(dev
->bus
, sysfs_device
->bus
) != 0) {
607 dbg(FIELD_BUS
" is not matching");
610 dbg(FIELD_BUS
" matches");
614 /* check for matching kernel name*/
615 if (dev
->kernel
[0] != '\0') {
616 dbg("check for " FIELD_KERNEL
" dev->kernel='%s' class_dev->name='%s'", dev
->kernel
, class_dev
->name
);
617 if (strcmp_pattern(dev
->kernel
, class_dev
->name
) != 0) {
618 dbg(FIELD_KERNEL
" is not matching");
621 dbg(FIELD_KERNEL
" matches");
625 /* check for matching bus id */
626 if (dev
->id
[0] != '\0') {
627 dbg("check " FIELD_ID
);
628 if (match_id(dev
, class_dev
, sysfs_device
) != 0) {
629 dbg(FIELD_ID
" is not matching");
632 dbg(FIELD_ID
" matches");
636 /* check for matching place of device */
637 if (dev
->place
[0] != '\0') {
638 dbg("check " FIELD_PLACE
);
639 if (match_place(dev
, class_dev
, sysfs_device
) != 0) {
640 dbg(FIELD_PLACE
" is not matching");
643 dbg(FIELD_PLACE
" matches");
647 /* check for matching sysfs pairs */
648 if (dev
->sysfs_pair
[0].file
[0] != '\0') {
649 dbg("check " FIELD_SYSFS
" pairs");
650 if (match_sysfs_pairs(dev
, class_dev
, sysfs_device
) != 0) {
651 dbg(FIELD_SYSFS
" is not matching");
654 dbg(FIELD_SYSFS
" matches");
658 /* execute external program */
659 if (dev
->program
[0] != '\0') {
660 dbg("check " FIELD_PROGRAM
);
661 apply_format(udev
, dev
->program
);
662 if (execute_program(dev
->program
, udev
->program_result
, NAME_SIZE
) != 0) {
663 dbg(FIELD_PROGRAM
" returned nozero");
666 dbg(FIELD_PROGRAM
" returned successful");
670 /* check for matching result of external program */
671 if (dev
->result
[0] != '\0') {
672 dbg("check for " FIELD_RESULT
673 " dev->result='%s', udev->program_result='%s'",
674 dev
->result
, udev
->program_result
);
675 if (strcmp_pattern(dev
->result
, udev
->program_result
) != 0) {
676 dbg(FIELD_RESULT
" is not matching");
679 dbg(FIELD_RESULT
" matches");
683 /* Yeah, we matched! */
687 dbg("try parent sysfs device");
688 sysfs_device
= sysfs_get_device_parent(sysfs_device
);
689 if (sysfs_device
== NULL
)
691 dbg("sysfs_device->path='%s'", sysfs_device
->path
);
692 dbg("sysfs_device->bus_id='%s'", sysfs_device
->bus_id
);
693 dbg("sysfs_device->bus='%s'", sysfs_device
->bus
);
698 int namedev_name_device(struct sysfs_class_device
*class_dev
, struct udevice
*udev
)
700 struct sysfs_device
*sysfs_device
= NULL
;
701 struct config_device
*dev
;
702 struct perm_device
*perm
;
707 /* find the sysfs_device associated with this class device */
708 sysfs_device
= get_sysfs_device(class_dev
);
710 dbg("sysfs_device->path='%s'", sysfs_device
->path
);
711 dbg("sysfs_device->bus_id='%s'", sysfs_device
->bus_id
);
712 dbg("sysfs_device->bus='%s'", sysfs_device
->bus
);
713 strfieldcpy(udev
->bus_id
, sysfs_device
->bus_id
);
714 wait_for_device_to_initialize(sysfs_device
);
716 dbg("class_dev->name = '%s'", class_dev
->name
);
718 strfieldcpy(udev
->kernel_name
, class_dev
->name
);
719 fix_kernel_name(udev
);
720 dbg("udev->kernel_name = '%s'", udev
->kernel_name
);
722 /* get kernel number */
723 pos
= class_dev
->name
+ strlen(class_dev
->name
);
724 while (isdigit(*(pos
-1)))
726 strfieldcpy(udev
->kernel_number
, pos
);
727 dbg("kernel_number='%s'", udev
->kernel_number
);
729 /* look for a matching rule to apply */
730 list_for_each_entry(dev
, &config_device_list
, node
) {
732 if (match_rule(dev
, class_dev
, udev
, sysfs_device
) == 0) {
733 if (dev
->name
[0] == '\0') {
734 info("configured rule in '%s' at line %i applied, '%s' is ignored",
735 udev_rules_filename
, dev
->config_line
, udev
->kernel_name
);
739 info("configured rule in '%s' at line %i applied, '%s' becomes '%s'",
740 udev_rules_filename
, dev
->config_line
, udev
->kernel_name
, dev
->name
);
741 strfieldcpy(udev
->name
, dev
->name
);
742 strfieldcpy(udev
->symlink
, dev
->symlink
);
747 /* no rule was found so we use the kernel name */
748 strfieldcpy(udev
->name
, class_dev
->name
);
752 /* substitute placeholder */
753 apply_format(udev
, udev
->name
);
754 apply_format(udev
, udev
->symlink
);
757 perm
= find_perm(udev
->name
);
759 udev
->mode
= perm
->mode
;
760 strfieldcpy(udev
->owner
, perm
->owner
);
761 strfieldcpy(udev
->group
, perm
->group
);
763 /* no matching perms found :( */
764 udev
->mode
= get_default_mode();
765 strncpy(udev
->owner
, get_default_owner(), OWNER_SIZE
);
766 strncpy(udev
->group
, get_default_group(), GROUP_SIZE
);
768 dbg("name, '%s' is going to have owner='%s', group='%s', mode = %#o",
769 udev
->name
, udev
->owner
, udev
->group
, udev
->mode
);
774 int namedev_init(void)
778 retval
= namedev_init_rules();
782 retval
= namedev_init_permissions();
786 dump_config_dev_list();
787 dump_perm_dev_list();