]>
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.
37 #include "udev_version.h"
39 #include "libsysfs/libsysfs.h"
40 #include "klibc_fixups.h"
42 LIST_HEAD(config_device_list
);
43 LIST_HEAD(perm_device_list
);
45 /* compare string with pattern (supports * ? [0-9] [!A-Z]) */
46 static int strcmp_pattern(const char *p
, const char *s
)
62 while (*p
&& (*p
!= ']')) {
65 if ((*s
>= *p
) && (*s
<= p
[2]))
73 while (*p
&& (*p
!= ']'))
75 return strcmp_pattern(p
+1, s
+1);
81 if (strcmp_pattern(p
, s
+1))
82 return strcmp_pattern(p
+1, s
);
90 if ((*p
== *s
) || (*p
== '?'))
91 return strcmp_pattern(p
+1, s
+1);
97 #define copy_var(a, b, var) \
101 #define copy_string(a, b, var) \
102 if (strlen(b->var)) \
103 strcpy(a->var, b->var);
105 int add_perm_dev(struct perm_device
*new_dev
)
107 struct list_head
*tmp
;
108 struct perm_device
*tmp_dev
;
110 /* update the values if we already have the device */
111 list_for_each(tmp
, &perm_device_list
) {
112 struct perm_device
*dev
= list_entry(tmp
, struct perm_device
, node
);
113 if (strcmp_pattern(new_dev
->name
, dev
->name
))
115 copy_var(dev
, new_dev
, mode
);
116 copy_string(dev
, new_dev
, owner
);
117 copy_string(dev
, new_dev
, group
);
121 /* not found, add new structure to the perm list */
122 tmp_dev
= malloc(sizeof(*tmp_dev
));
125 memcpy(tmp_dev
, new_dev
, sizeof(*tmp_dev
));
126 list_add_tail(&tmp_dev
->node
, &perm_device_list
);
127 //dump_perm_dev(tmp_dev);
131 static struct perm_device
*find_perm(char *name
)
133 struct list_head
*tmp
;
134 struct perm_device
*perm
= NULL
;
136 list_for_each(tmp
, &perm_device_list
) {
137 perm
= list_entry(tmp
, struct perm_device
, node
);
138 if (strcmp_pattern(perm
->name
, name
))
145 static mode_t
get_default_mode(struct sysfs_class_device
*class_dev
)
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 void apply_format(struct udevice
*udev
, unsigned char *string
)
157 char name
[NAME_SIZE
];
158 char temp
[NAME_SIZE
];
167 pos
= strchr(string
, '%');
172 if (isdigit(tail
[0])) {
173 num
= (int) strtoul(&pos
[1], &tail
, 10);
175 dbg("format parsing error '%s'", pos
+1);
179 strfieldcpy(name
, tail
+1);
183 if (strlen(udev
->bus_id
) == 0)
185 strcat(pos
, udev
->bus_id
);
186 dbg("substitute bus_id '%s'", udev
->bus_id
);
189 if (strlen(udev
->kernel_name
) == 0)
191 strcat(pos
, udev
->kernel_name
);
192 dbg("substitute kernel name '%s'", udev
->kernel_name
);
195 if (strlen(udev
->kernel_number
) == 0)
197 strcat(pos
, udev
->kernel_number
);
198 dbg("substitute kernel number '%s'", udev
->kernel_number
);
201 if (strlen(udev
->kernel_number
) == 0) {
206 strcat(pos
, udev
->kernel_number
);
207 dbg("substitute kernel number '%s'", udev
->kernel_number
);
210 sprintf(pos
, "%u", udev
->minor
);
211 dbg("substitute minor number '%u'", udev
->minor
);
214 sprintf(pos
, "%u", udev
->major
);
215 dbg("substitute major number '%u'", udev
->major
);
218 if (strlen(udev
->callout_value
) == 0)
221 /* get part of return string */
222 strncpy(temp
, udev
->callout_value
, sizeof(temp
));
226 pos3
= strsep(&pos2
, " ");
228 dbg("requested part of callout string not found");
233 dbg("substitute partial callout output '%s'", pos3
);
235 strcat(pos
, udev
->callout_value
);
236 dbg("substitute callout output '%s'", udev
->callout_value
);
240 dbg("unknown substitution type '%%%c'", pos
[1]);
243 strcat(string
, name
);
249 static struct bus_file
{
253 { .bus
= "scsi", .file
= "vendor" },
254 { .bus
= "usb", .file
= "idVendor" },
258 #define SECONDS_TO_WAIT_FOR_FILE 10
259 static void wait_for_device_to_initialize(struct sysfs_device
*sysfs_device
)
261 /* sleep until we see the file for this specific bus type show up this
262 * is needed because we can easily out-run the kernel in looking for
263 * these files before the paticular subsystem has created them in the
264 * sysfs tree properly.
266 * And people thought that the /sbin/hotplug event system was going to
267 * be slow, poo on you for arguing that before even testing it...
269 struct bus_file
*b
= &bus_files
[0];
270 struct sysfs_attribute
*tmpattr
;
276 if (strcmp(sysfs_device
->bus
, b
->bus
) == 0) {
278 loop
= SECONDS_TO_WAIT_FOR_FILE
;
280 dbg("looking for file '%s' on bus '%s'", b
->file
, b
->bus
);
281 tmpattr
= sysfs_get_device_attr(sysfs_device
, b
->file
);
286 /* sleep to give the kernel a chance to create the file */
289 dbg("Timed out waiting for '%s' file, continuing on anyway...", b
->file
);
294 dbg("Did not find bus type '%s' on list of bus_id_files, contact greg@kroah.com", sysfs_device
->bus
);
296 return; /* here to prevent compiler warning... */
299 static int exec_callout(struct config_device
*dev
, char *value
, int len
)
309 char *args
[CALLOUT_MAXARG
];
312 dbg("callout to '%s'", dev
->exec_program
);
326 close(STDOUT_FILENO
);
327 dup(fds
[1]); /* dup write side of pipe to STDOUT */
328 if (strchr(dev
->exec_program
, ' ')) {
329 /* callout with arguments */
330 pos
= dev
->exec_program
;
331 for (i
=0; i
< CALLOUT_MAXARG
-1; i
++) {
332 args
[i
] = strsep(&pos
, " ");
337 dbg("too many args - %d", i
);
340 retval
= execve(args
[0], args
, main_envp
);
342 retval
= execve(dev
->exec_program
, main_argv
, main_envp
);
345 dbg("child execve failed");
348 return -1; /* avoid compiler warning */
350 /* parent reads from fds[0] */
354 res
= read(fds
[0], buffer
, sizeof(buffer
) - 1);
359 dbg("callout len %d too short", len
);
363 dbg("callout value already set");
367 strncpy(value
, buffer
, len
);
368 pos
= value
+ strlen(value
)-1;
371 dbg("callout returned '%s'", value
);
377 dbg("wait failed result %d", res
);
382 if (!WIFEXITED(status
) || (WEXITSTATUS(status
) != 0)) {
383 dbg("callout program status 0x%x", status
);
391 static int do_callout(struct sysfs_class_device
*class_dev
, struct udevice
*udev
, struct sysfs_device
*sysfs_device
)
393 struct config_device
*dev
;
394 struct list_head
*tmp
;
396 list_for_each(tmp
, &config_device_list
) {
397 dev
= list_entry(tmp
, struct config_device
, node
);
398 if (dev
->type
!= CALLOUT
)
402 dbg("dev->bus='%s' sysfs_device->bus='%s'", dev
->bus
, sysfs_device
->bus
);
403 if (strcasecmp(dev
->bus
, sysfs_device
->bus
) != 0)
407 /* substitute anything that needs to be in the program name */
408 apply_format(udev
, dev
->exec_program
);
409 if (exec_callout(dev
, udev
->callout_value
, NAME_SIZE
))
411 if (strcmp_pattern(dev
->id
, udev
->callout_value
) != 0)
413 strfieldcpy(udev
->name
, dev
->name
);
414 strfieldcpy(udev
->symlink
, dev
->symlink
);
415 dbg("callout returned matching value '%s', '%s' becomes '%s'",
416 dev
->id
, class_dev
->name
, udev
->name
);
422 static int match_pair(struct sysfs_class_device
*class_dev
, struct sysfs_device
*sysfs_device
, struct sysfs_pair
*pair
)
424 struct sysfs_attribute
*tmpattr
= NULL
;
427 if ((pair
== NULL
) || (pair
->file
[0] == '\0') || (pair
->value
== '\0'))
430 dbg("look for device attribute '%s'", pair
->file
);
431 /* try to find the attribute in the class device directory */
432 tmpattr
= sysfs_get_classdev_attr(class_dev
, pair
->file
);
436 /* look in the class device directory if present */
438 tmpattr
= sysfs_get_device_attr(sysfs_device
, pair
->file
);
446 c
= tmpattr
->value
+ strlen(tmpattr
->value
)-1;
449 dbg("compare attribute '%s' value '%s' with '%s'",
450 pair
->file
, tmpattr
->value
, pair
->value
);
451 if (strcmp_pattern(pair
->value
, tmpattr
->value
) != 0)
454 dbg("found matching attribute '%s' with value '%s'",
455 pair
->file
, pair
->value
);
459 static int do_label(struct sysfs_class_device
*class_dev
, struct udevice
*udev
, struct sysfs_device
*sysfs_device
)
461 struct sysfs_pair
*pair
;
462 struct config_device
*dev
;
463 struct list_head
*tmp
;
467 list_for_each(tmp
, &config_device_list
) {
468 dev
= list_entry(tmp
, struct config_device
, node
);
469 if (dev
->type
!= LABEL
)
473 dbg("dev->bus='%s' sysfs_device->bus='%s'", dev
->bus
, sysfs_device
->bus
);
474 if (strcasecmp(dev
->bus
, sysfs_device
->bus
) != 0)
479 for (i
= 0; i
< MAX_SYSFS_PAIRS
; ++i
) {
480 pair
= &dev
->sysfs_pair
[i
];
481 if ((pair
->file
[0] == '\0') || (pair
->value
[0] == '\0'))
483 if (match_pair(class_dev
, sysfs_device
, pair
) != 0) {
492 strfieldcpy(udev
->name
, dev
->name
);
493 strfieldcpy(udev
->symlink
, dev
->symlink
);
494 dbg("found matching attribute, '%s' becomes '%s' ",
495 class_dev
->name
, udev
->name
);
502 static int do_number(struct sysfs_class_device
*class_dev
, struct udevice
*udev
, struct sysfs_device
*sysfs_device
)
504 struct config_device
*dev
;
505 struct list_head
*tmp
;
506 char path
[SYSFS_PATH_MAX
];
510 /* we have to have a sysfs device for NUMBER to work */
514 list_for_each(tmp
, &config_device_list
) {
515 dev
= list_entry(tmp
, struct config_device
, node
);
516 if (dev
->type
!= NUMBER
)
519 dbg("dev->bus='%s' sysfs_device->bus='%s'", dev
->bus
, sysfs_device
->bus
);
520 if (strcasecmp(dev
->bus
, sysfs_device
->bus
) != 0)
524 strfieldcpy(path
, sysfs_device
->path
);
525 temp
= strrchr(path
, '/');
526 dbg("search '%s' in '%s', path='%s'", dev
->id
, temp
, path
);
527 if (strstr(temp
, dev
->id
) != NULL
) {
531 temp
= strrchr(path
, '/');
532 dbg("search '%s' in '%s', path='%s'", dev
->id
, temp
, path
);
533 if (strstr(temp
, dev
->id
) != NULL
)
538 strfieldcpy(udev
->name
, dev
->name
);
539 strfieldcpy(udev
->symlink
, dev
->symlink
);
540 dbg("found matching id '%s', '%s' becomes '%s'",
541 dev
->id
, class_dev
->name
, udev
->name
);
547 static int do_topology(struct sysfs_class_device
*class_dev
, struct udevice
*udev
, struct sysfs_device
*sysfs_device
)
549 struct config_device
*dev
;
550 struct list_head
*tmp
;
551 char path
[SYSFS_PATH_MAX
];
555 /* we have to have a sysfs device for TOPOLOGY to work */
559 list_for_each(tmp
, &config_device_list
) {
560 dev
= list_entry(tmp
, struct config_device
, node
);
561 if (dev
->type
!= TOPOLOGY
)
564 dbg("dev->bus='%s' sysfs_device->bus='%s'", dev
->bus
, sysfs_device
->bus
);
565 if (strcasecmp(dev
->bus
, sysfs_device
->bus
) != 0)
569 strfieldcpy(path
, sysfs_device
->path
);
570 temp
= strrchr(path
, '/');
571 dbg("search '%s' in '%s', path='%s'", dev
->place
, temp
, path
);
572 if (strstr(temp
, dev
->place
) != NULL
) {
576 temp
= strrchr(path
, '/');
577 dbg("search '%s' in '%s', path='%s'", dev
->place
, temp
, path
);
578 if (strstr(temp
, dev
->place
) != NULL
)
584 strfieldcpy(udev
->name
, dev
->name
);
585 strfieldcpy(udev
->symlink
, dev
->symlink
);
586 dbg("found matching place '%s', '%s' becomes '%s'",
587 dev
->place
, class_dev
->name
, udev
->name
);
593 static int do_replace(struct sysfs_class_device
*class_dev
, struct udevice
*udev
, struct sysfs_device
*sysfs_device
)
595 struct config_device
*dev
;
596 struct list_head
*tmp
;
598 list_for_each(tmp
, &config_device_list
) {
599 dev
= list_entry(tmp
, struct config_device
, node
);
600 if (dev
->type
!= REPLACE
)
603 dbg("compare name '%s' with '%s'", dev
->kernel_name
, class_dev
->name
);
604 if (strcmp_pattern(dev
->kernel_name
, class_dev
->name
) != 0)
607 strfieldcpy(udev
->name
, dev
->name
);
608 strfieldcpy(udev
->symlink
, dev
->symlink
);
609 dbg("found name, '%s' becomes '%s'", dev
->kernel_name
, udev
->name
);
616 static void do_kernelname(struct sysfs_class_device
*class_dev
, struct udevice
*udev
)
618 /* heh, this is pretty simple... */
619 strfieldcpy(udev
->name
, class_dev
->name
);
622 static struct sysfs_device
*get_sysfs_device(struct sysfs_class_device
*class_dev
)
624 struct sysfs_device
*sysfs_device
;
625 struct sysfs_class_device
*class_dev_parent
;
629 /* This is needed here as we can easily out-race the placement of the
630 * device symlink by the kernel. The call to sleep(1); will be removed
631 * once libsysfs can be queried for sysfs_get_classdev_device()
632 * multiple times and have it return the proper information when the
633 * class device really shows up. For now, we live with the time
639 Something like this could also work, but for some reason doesn't,
640 I also tried just stat() on the device symlink, but that still
641 has nasty races, I'm probably doing something stupid... :( */
646 char filename
[SYSFS_PATH_MAX
+ 6];
648 strcpy(filename
, class_dev
->path
);
649 strcat(filename
, "/device");
650 dbg("looking for '%s'", filename
);
651 retval
= stat(filename
, &buf
);
655 /* bah, let's go backwards up a level to see if the device is there,
656 * as block partitions don't point to the physical device. Need to fix that
657 * up in the kernel...
659 if (strcmp(class_dev
->classname
, SYSFS_BLOCK_NAME
) == 0) {
660 if (isdigit(class_dev
->path
[strlen(class_dev
->path
)-1])) {
661 class_dev_parent
= sysfs_get_classdev_parent(class_dev
);
662 if (class_dev_parent
== NULL
) {
663 dbg("sysfs_get_classdev_parent for class device '%s' failed", class_dev
->name
);
665 strcpy(filename
, class_dev_parent
->path
);
666 strcat(filename
, "/device");
667 dbg("looking for '%s'", filename
);
668 retval
= stat(filename
, &buf
);
674 /* sleep to give the kernel a chance to create the device file */
678 loop
= 1; /* FIXME put a real value in here for when everything is fixed... */
680 /* find the sysfs_device for this class device */
681 /* Wouldn't it really be nice if libsysfs could do this for us? */
682 sysfs_device
= sysfs_get_classdev_device(class_dev
);
683 if (sysfs_device
!= NULL
)
686 /* bah, let's go backwards up a level to see if the device is there,
687 * as block partitions don't point to the physical device. Need to fix that
688 * up in the kernel...
690 if (strcmp(class_dev
->classname
, SYSFS_BLOCK_NAME
) == 0) {
691 dbg("looking at block device");
692 if (isdigit(class_dev
->path
[strlen(class_dev
->path
)-1])) {
693 dbg("really is a partition");
694 class_dev_parent
= sysfs_get_classdev_parent(class_dev
);
695 if (class_dev_parent
== NULL
) {
696 dbg("sysfs_get_classdev_parent for class device '%s' failed", class_dev
->name
);
698 dbg("class_dev_parent->name='%s'", class_dev_parent
->name
);
699 sysfs_device
= sysfs_get_classdev_device(class_dev_parent
);
700 if (sysfs_device
!= NULL
)
705 /* sleep to give the kernel a chance to create the link */
709 dbg("Timed out waiting for device symlink, continuing on anyway...");
714 int namedev_name_device(struct sysfs_class_device
*class_dev
, struct udevice
*udev
)
716 struct sysfs_device
*sysfs_device
= NULL
;
717 struct sysfs_class_device
*class_dev_parent
= NULL
;
719 struct perm_device
*perm
;
724 /* find the sysfs_device associated with this class device */
725 sysfs_device
= get_sysfs_device(class_dev
);
727 dbg("sysfs_device->path='%s'", sysfs_device
->path
);
728 dbg("sysfs_device->bus_id='%s'", sysfs_device
->bus_id
);
729 dbg("sysfs_device->bus='%s'", sysfs_device
->bus
);
730 strfieldcpy(udev
->bus_id
, sysfs_device
->bus_id
);
731 wait_for_device_to_initialize(sysfs_device
);
733 dbg("class_dev->name = '%s'", class_dev
->name
);
736 strfieldcpy(udev
->kernel_name
, class_dev
->name
);
738 /* get kernel number */
739 pos
= class_dev
->name
+ strlen(class_dev
->name
);
740 while (isdigit(*(pos
-1)))
742 strfieldcpy(udev
->kernel_number
, pos
);
743 dbg("kernel_number='%s'", udev
->kernel_number
);
745 /* rules are looked at in priority order */
746 retval
= do_callout(class_dev
, udev
, sysfs_device
);
750 retval
= do_label(class_dev
, udev
, sysfs_device
);
754 retval
= do_number(class_dev
, udev
, sysfs_device
);
758 retval
= do_topology(class_dev
, udev
, sysfs_device
);
762 retval
= do_replace(class_dev
, udev
, sysfs_device
);
766 do_kernelname(class_dev
, udev
);
770 /* substitute placeholder */
771 apply_format(udev
, udev
->name
);
772 apply_format(udev
, udev
->symlink
);
775 perm
= find_perm(udev
->name
);
777 udev
->mode
= perm
->mode
;
778 strfieldcpy(udev
->owner
, perm
->owner
);
779 strfieldcpy(udev
->group
, perm
->group
);
781 /* no matching perms found :( */
782 udev
->mode
= get_default_mode(class_dev
);
783 udev
->owner
[0] = 0x00;
784 udev
->group
[0] = 0x00;
786 dbg("name, '%s' is going to have owner='%s', group='%s', mode = %#o",
787 udev
->name
, udev
->owner
, udev
->group
, udev
->mode
);
792 int namedev_init(void)
796 retval
= namedev_init_rules();
800 retval
= namedev_init_permissions();
804 dump_config_dev_list();
805 dump_perm_dev_list();