]>
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) {
203 dbg("substitute devfs disc");
207 strcat(pos
, udev
->kernel_number
);
208 dbg("substitute devfs part '%s'", udev
->kernel_number
);
211 sprintf(pos
, "%u", udev
->minor
);
212 dbg("substitute minor number '%u'", udev
->minor
);
215 sprintf(pos
, "%u", udev
->major
);
216 dbg("substitute major number '%u'", udev
->major
);
219 if (strlen(udev
->callout_value
) == 0)
222 /* get part of return string */
223 strncpy(temp
, udev
->callout_value
, sizeof(temp
));
227 pos3
= strsep(&pos2
, " ");
229 dbg("requested part of callout string not found");
235 dbg("substitute partial callout output '%s'", pos3
);
238 strcat(pos
, udev
->callout_value
);
239 dbg("substitute callout output '%s'", udev
->callout_value
);
243 dbg("unknown substitution type '%%%c'", pos
[1]);
246 strcat(string
, name
);
252 static struct bus_file
{
256 { .bus
= "scsi", .file
= "vendor" },
257 { .bus
= "usb", .file
= "idVendor" },
258 { .bus
= "ide", .file
= "detach_state" },
259 { .bus
= "pci", .file
= "vendor" },
263 #define SECONDS_TO_WAIT_FOR_FILE 10
264 static void wait_for_device_to_initialize(struct sysfs_device
*sysfs_device
)
266 /* sleep until we see the file for this specific bus type show up this
267 * is needed because we can easily out-run the kernel in looking for
268 * these files before the paticular subsystem has created them in the
269 * sysfs tree properly.
271 * And people thought that the /sbin/hotplug event system was going to
272 * be slow, poo on you for arguing that before even testing it...
274 struct bus_file
*b
= &bus_files
[0];
275 struct sysfs_attribute
*tmpattr
;
281 if (strcmp(sysfs_device
->bus
, b
->bus
) == 0) {
283 loop
= SECONDS_TO_WAIT_FOR_FILE
;
285 dbg("looking for file '%s' on bus '%s'", b
->file
, b
->bus
);
286 tmpattr
= sysfs_get_device_attr(sysfs_device
, b
->file
);
291 /* sleep to give the kernel a chance to create the file */
294 dbg("Timed out waiting for '%s' file, continuing on anyway...", b
->file
);
299 dbg("Did not find bus type '%s' on list of bus_id_files, contact greg@kroah.com", sysfs_device
->bus
);
301 return; /* here to prevent compiler warning... */
304 static int exec_callout(struct config_device
*dev
, char *value
, int len
)
314 char *args
[CALLOUT_MAXARG
];
317 dbg("callout to '%s'", dev
->exec_program
);
331 close(STDOUT_FILENO
);
332 dup(fds
[1]); /* dup write side of pipe to STDOUT */
333 if (strchr(dev
->exec_program
, ' ')) {
334 /* callout with arguments */
335 pos
= dev
->exec_program
;
336 for (i
=0; i
< CALLOUT_MAXARG
-1; i
++) {
337 args
[i
] = strsep(&pos
, " ");
342 dbg("too many args - %d", i
);
345 retval
= execve(args
[0], args
, main_envp
);
347 retval
= execve(dev
->exec_program
, main_argv
, main_envp
);
350 dbg("child execve failed");
353 return -1; /* avoid compiler warning */
355 /* parent reads from fds[0] */
359 res
= read(fds
[0], buffer
, sizeof(buffer
) - 1);
364 dbg("callout len %d too short", len
);
368 dbg("callout value already set");
372 strncpy(value
, buffer
, len
);
373 pos
= value
+ strlen(value
)-1;
376 dbg("callout returned '%s'", value
);
382 dbg("wait failed result %d", res
);
387 if (!WIFEXITED(status
) || (WEXITSTATUS(status
) != 0)) {
388 dbg("callout program status 0x%x", status
);
396 static int do_callout(struct sysfs_class_device
*class_dev
, struct udevice
*udev
, struct sysfs_device
*sysfs_device
)
398 struct config_device
*dev
;
399 struct list_head
*tmp
;
401 list_for_each(tmp
, &config_device_list
) {
402 dev
= list_entry(tmp
, struct config_device
, node
);
403 if (dev
->type
!= CALLOUT
)
406 if (dev
->bus
[0] != '\0') {
407 /* as the user specified a bus, we must match it up */
410 dbg("dev->bus='%s' sysfs_device->bus='%s'", dev
->bus
, sysfs_device
->bus
);
411 if (strcasecmp(dev
->bus
, sysfs_device
->bus
) != 0)
415 /* substitute anything that needs to be in the program name */
416 apply_format(udev
, dev
->exec_program
);
417 if (exec_callout(dev
, udev
->callout_value
, NAME_SIZE
))
419 if (strcmp_pattern(dev
->id
, udev
->callout_value
) != 0)
421 strfieldcpy(udev
->name
, dev
->name
);
422 strfieldcpy(udev
->symlink
, dev
->symlink
);
423 dbg("callout returned matching value '%s', '%s' becomes '%s'",
424 dev
->id
, class_dev
->name
, udev
->name
);
430 static int match_pair(struct sysfs_class_device
*class_dev
, struct sysfs_device
*sysfs_device
, struct sysfs_pair
*pair
)
432 struct sysfs_attribute
*tmpattr
= NULL
;
435 if ((pair
== NULL
) || (pair
->file
[0] == '\0') || (pair
->value
== '\0'))
438 dbg("look for device attribute '%s'", pair
->file
);
439 /* try to find the attribute in the class device directory */
440 tmpattr
= sysfs_get_classdev_attr(class_dev
, pair
->file
);
444 /* look in the class device directory if present */
446 tmpattr
= sysfs_get_device_attr(sysfs_device
, pair
->file
);
454 c
= tmpattr
->value
+ strlen(tmpattr
->value
)-1;
457 dbg("compare attribute '%s' value '%s' with '%s'",
458 pair
->file
, tmpattr
->value
, pair
->value
);
459 if (strcmp_pattern(pair
->value
, tmpattr
->value
) != 0)
462 dbg("found matching attribute '%s' with value '%s'",
463 pair
->file
, pair
->value
);
467 static int do_label(struct sysfs_class_device
*class_dev
, struct udevice
*udev
, struct sysfs_device
*sysfs_device
)
469 struct sysfs_pair
*pair
;
470 struct config_device
*dev
;
471 struct list_head
*tmp
;
475 list_for_each(tmp
, &config_device_list
) {
476 dev
= list_entry(tmp
, struct config_device
, node
);
477 if (dev
->type
!= LABEL
)
480 if (dev
->bus
[0] != '\0') {
481 /* as the user specified a bus, we must match it up */
484 dbg("dev->bus='%s' sysfs_device->bus='%s'", dev
->bus
, sysfs_device
->bus
);
485 if (strcasecmp(dev
->bus
, sysfs_device
->bus
) != 0)
490 for (i
= 0; i
< MAX_SYSFS_PAIRS
; ++i
) {
491 pair
= &dev
->sysfs_pair
[i
];
492 if ((pair
->file
[0] == '\0') || (pair
->value
[0] == '\0'))
494 if (match_pair(class_dev
, sysfs_device
, pair
) != 0) {
503 strfieldcpy(udev
->name
, dev
->name
);
504 strfieldcpy(udev
->symlink
, dev
->symlink
);
505 dbg("found matching attribute, '%s' becomes '%s' ",
506 class_dev
->name
, udev
->name
);
513 static int do_number(struct sysfs_class_device
*class_dev
, struct udevice
*udev
, struct sysfs_device
*sysfs_device
)
515 struct config_device
*dev
;
516 struct list_head
*tmp
;
517 char path
[SYSFS_PATH_MAX
];
521 /* we have to have a sysfs device for NUMBER to work */
525 list_for_each(tmp
, &config_device_list
) {
526 dev
= list_entry(tmp
, struct config_device
, node
);
527 if (dev
->type
!= NUMBER
)
530 dbg("dev->bus='%s' sysfs_device->bus='%s'", dev
->bus
, sysfs_device
->bus
);
531 if (strcasecmp(dev
->bus
, sysfs_device
->bus
) != 0)
535 strfieldcpy(path
, sysfs_device
->path
);
536 temp
= strrchr(path
, '/');
537 dbg("search '%s' in '%s', path='%s'", dev
->id
, temp
, path
);
538 if (strstr(temp
, dev
->id
) != NULL
) {
542 temp
= strrchr(path
, '/');
543 dbg("search '%s' in '%s', path='%s'", dev
->id
, temp
, path
);
544 if (strstr(temp
, dev
->id
) != NULL
)
549 strfieldcpy(udev
->name
, dev
->name
);
550 strfieldcpy(udev
->symlink
, dev
->symlink
);
551 dbg("found matching id '%s', '%s' becomes '%s'",
552 dev
->id
, class_dev
->name
, udev
->name
);
558 static int do_topology(struct sysfs_class_device
*class_dev
, struct udevice
*udev
, struct sysfs_device
*sysfs_device
)
560 struct config_device
*dev
;
561 struct list_head
*tmp
;
562 char path
[SYSFS_PATH_MAX
];
566 /* we have to have a sysfs device for TOPOLOGY to work */
570 list_for_each(tmp
, &config_device_list
) {
571 dev
= list_entry(tmp
, struct config_device
, node
);
572 if (dev
->type
!= TOPOLOGY
)
575 dbg("dev->bus='%s' sysfs_device->bus='%s'", dev
->bus
, sysfs_device
->bus
);
576 if (strcasecmp(dev
->bus
, sysfs_device
->bus
) != 0)
580 strfieldcpy(path
, sysfs_device
->path
);
581 temp
= strrchr(path
, '/');
582 dbg("search '%s' in '%s', path='%s'", dev
->place
, temp
, path
);
583 if (strstr(temp
, dev
->place
) != NULL
) {
587 temp
= strrchr(path
, '/');
588 dbg("search '%s' in '%s', path='%s'", dev
->place
, temp
, path
);
589 if (strstr(temp
, dev
->place
) != NULL
)
595 strfieldcpy(udev
->name
, dev
->name
);
596 strfieldcpy(udev
->symlink
, dev
->symlink
);
597 dbg("found matching place '%s', '%s' becomes '%s'",
598 dev
->place
, class_dev
->name
, udev
->name
);
604 static int do_replace(struct sysfs_class_device
*class_dev
, struct udevice
*udev
, struct sysfs_device
*sysfs_device
)
606 struct config_device
*dev
;
607 struct list_head
*tmp
;
609 list_for_each(tmp
, &config_device_list
) {
610 dev
= list_entry(tmp
, struct config_device
, node
);
611 if (dev
->type
!= REPLACE
)
614 dbg("compare name '%s' with '%s'", dev
->kernel_name
, class_dev
->name
);
615 if (strcmp_pattern(dev
->kernel_name
, class_dev
->name
) != 0)
618 strfieldcpy(udev
->name
, dev
->name
);
619 strfieldcpy(udev
->symlink
, dev
->symlink
);
620 dbg("found name, '%s' becomes '%s'", dev
->kernel_name
, udev
->name
);
627 static void do_kernelname(struct sysfs_class_device
*class_dev
, struct udevice
*udev
)
629 /* heh, this is pretty simple... */
630 strfieldcpy(udev
->name
, class_dev
->name
);
633 static struct sysfs_device
*get_sysfs_device(struct sysfs_class_device
*class_dev
)
635 struct sysfs_device
*sysfs_device
;
636 struct sysfs_class_device
*class_dev_parent
;
638 char filename
[SYSFS_PATH_MAX
+ 6];
643 /* Figure out where the device symlink is at. For char devices this will
644 * always be in the class_dev->path. But for block devices, it's different.
645 * The main block device will have the device symlink in it's path, but
646 * all partitions have the symlink in its parent directory.
647 * But we need to watch out for block devices that do not have parents, yet
648 * look like a partition (fd0, loop0, etc.) They all do not have a device
649 * symlink yet. We do sit and spin on waiting for them right now, we should
650 * possibly have a whitelist for these devices here...
652 strcpy(filename
, class_dev
->path
);
653 dbg("filename = %s", filename
);
654 if (strcmp(class_dev
->classname
, SYSFS_BLOCK_NAME
) == 0) {
655 if (isdigit(class_dev
->path
[strlen(class_dev
->path
)-1])) {
656 temp
= strrchr(filename
, '/');
660 char *temp2
= strrchr(filename
, '/');
661 dbg("temp2 = %s", temp2
);
662 if (temp2
&& (strcmp(temp2
, "/block") == 0)) {
663 /* oops, we have no parent block device, so go back to original directory */
664 strcpy(filename
, class_dev
->path
);
670 strcat(filename
, "/device");
675 dbg("looking for '%s'", filename
);
676 retval
= stat(filename
, &buf
);
679 /* sleep to give the kernel a chance to create the device file */
683 loop
= 1; /* FIXME put a real value in here for when everything is fixed... */
685 /* find the sysfs_device for this class device */
686 /* Wouldn't it really be nice if libsysfs could do this for us? */
687 sysfs_device
= sysfs_get_classdev_device(class_dev
);
688 if (sysfs_device
!= NULL
)
691 /* if it's a partition, we need to get the parent device */
693 /* FIXME HACK HACK HACK HACK
694 * for some reason partitions need this extra sleep here, in order
695 * to wait for the device properly. Once the libsysfs code is
696 * fixed properly, this sleep should go away, and we can just loop above.
699 dbg("really is a partition");
700 class_dev_parent
= sysfs_get_classdev_parent(class_dev
);
701 if (class_dev_parent
== NULL
) {
702 dbg("sysfs_get_classdev_parent for class device '%s' failed", class_dev
->name
);
704 dbg("class_dev_parent->name='%s'", class_dev_parent
->name
);
705 sysfs_device
= sysfs_get_classdev_device(class_dev_parent
);
706 if (sysfs_device
!= NULL
)
710 /* sleep to give the kernel a chance to create the link */
711 /* FIXME remove comment...
714 dbg("Timed out waiting for device symlink, continuing on anyway...");
719 int namedev_name_device(struct sysfs_class_device
*class_dev
, struct udevice
*udev
)
721 struct sysfs_device
*sysfs_device
= NULL
;
723 struct perm_device
*perm
;
728 /* find the sysfs_device associated with this class device */
729 sysfs_device
= get_sysfs_device(class_dev
);
731 dbg("sysfs_device->path='%s'", sysfs_device
->path
);
732 dbg("sysfs_device->bus_id='%s'", sysfs_device
->bus_id
);
733 dbg("sysfs_device->bus='%s'", sysfs_device
->bus
);
734 strfieldcpy(udev
->bus_id
, sysfs_device
->bus_id
);
735 wait_for_device_to_initialize(sysfs_device
);
737 dbg("class_dev->name = '%s'", class_dev
->name
);
740 strfieldcpy(udev
->kernel_name
, class_dev
->name
);
742 /* get kernel number */
743 pos
= class_dev
->name
+ strlen(class_dev
->name
);
744 while (isdigit(*(pos
-1)))
746 strfieldcpy(udev
->kernel_number
, pos
);
747 dbg("kernel_number='%s'", udev
->kernel_number
);
749 /* rules are looked at in priority order */
750 retval
= do_callout(class_dev
, udev
, sysfs_device
);
754 retval
= do_label(class_dev
, udev
, sysfs_device
);
758 retval
= do_number(class_dev
, udev
, sysfs_device
);
762 retval
= do_topology(class_dev
, udev
, sysfs_device
);
766 retval
= do_replace(class_dev
, udev
, sysfs_device
);
770 do_kernelname(class_dev
, udev
);
774 /* substitute placeholder */
775 apply_format(udev
, udev
->name
);
776 apply_format(udev
, udev
->symlink
);
779 perm
= find_perm(udev
->name
);
781 udev
->mode
= perm
->mode
;
782 strfieldcpy(udev
->owner
, perm
->owner
);
783 strfieldcpy(udev
->group
, perm
->group
);
785 /* no matching perms found :( */
786 udev
->mode
= get_default_mode(class_dev
);
787 udev
->owner
[0] = 0x00;
788 udev
->group
[0] = 0x00;
790 dbg("name, '%s' is going to have owner='%s', group='%s', mode = %#o",
791 udev
->name
, udev
->owner
, udev
->group
, udev
->mode
);
796 int namedev_init(void)
800 retval
= namedev_init_rules();
804 retval
= namedev_init_permissions();
808 dump_config_dev_list();
809 dump_perm_dev_list();