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.
24 /* define this to enable parsing debugging */
25 /* #define DEBUG_PARSER */
39 #include "udev_version.h"
41 #include "libsysfs/libsysfs.h"
42 #include "klibc_fixups.h"
44 #define TYPE_LABEL "LABEL"
45 #define TYPE_NUMBER "NUMBER"
46 #define TYPE_TOPOLOGY "TOPOLOGY"
47 #define TYPE_REPLACE "REPLACE"
48 #define TYPE_CALLOUT "CALLOUT"
49 #define CALLOUT_MAXARG 8
51 static LIST_HEAD(config_device_list);
53 static void dump_dev(struct config_device *dev)
57 dbg_parse("KERNEL name='%s' ,"
58 "owner='%s', group='%s', mode=%#o",
59 dev->name, dev->owner, dev->group, dev->mode);
62 dbg_parse("LABEL name='%s', bus='%s', sysfs_file='%s', sysfs_value='%s', "
63 "owner='%s', group='%s', mode=%#o",
64 dev->name, dev->bus, dev->sysfs_file, dev->sysfs_value,
65 dev->owner, dev->group, dev->mode);
68 dbg_parse("NUMBER name='%s', bus='%s', id='%s', "
69 "owner='%s', group='%s', mode=%#o",
70 dev->name, dev->bus, dev->id,
71 dev->owner, dev->group, dev->mode);
74 dbg_parse("TOPOLOGY name='%s', bus='%s', place='%s', "
75 "owner='%s', group='%s', mode=%#o",
76 dev->name, dev->bus, dev->place,
77 dev->owner, dev->group, dev->mode);
80 dbg_parse("REPLACE name=%s, kernel_name=%s, "
81 "owner='%s', group='%s', mode=%#o",
82 dev->name, dev->kernel_name,
83 dev->owner, dev->group, dev->mode);
86 dbg_parse("CALLOUT name='%s', bus='%s', program='%s', id='%s', "
87 "owner='%s', group='%s', mode=%#o",
88 dev->name, dev->bus, dev->exec_program, dev->id,
89 dev->owner, dev->group, dev->mode);
92 dbg_parse("unknown type of method");
96 #define copy_var(a, b, var) \
100 #define copy_string(a, b, var) \
101 if (strlen(b->var)) \
102 strcpy(a->var, b->var);
104 static int add_dev(struct config_device *new_dev)
106 struct list_head *tmp;
107 struct config_device *tmp_dev;
109 /* update the values if we already have the device */
110 list_for_each(tmp, &config_device_list) {
111 struct config_device *dev = list_entry(tmp, struct config_device, node);
112 int len = strlen(new_dev->name);
113 if (new_dev->name[len-1] == '*') {
115 if (strncmp(dev->name, new_dev->name, len))
118 if (strcmp(dev->name, new_dev->name))
121 /* the same, copy the new info into this structure */
122 copy_var(dev, new_dev, type);
123 copy_var(dev, new_dev, mode);
124 copy_string(dev, new_dev, bus);
125 copy_string(dev, new_dev, sysfs_file);
126 copy_string(dev, new_dev, sysfs_value);
127 copy_string(dev, new_dev, id);
128 copy_string(dev, new_dev, place);
129 copy_string(dev, new_dev, kernel_name);
130 copy_string(dev, new_dev, owner);
131 copy_string(dev, new_dev, group);
135 /* not found, add new structure to the device list */
136 tmp_dev = malloc(sizeof(*tmp_dev));
139 memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
140 list_add(&tmp_dev->node, &config_device_list);
145 static void dump_dev_list(void)
147 struct list_head *tmp;
149 list_for_each(tmp, &config_device_list) {
150 struct config_device *dev = list_entry(tmp, struct config_device, node);
155 static int get_pair(char **orig_string, char **left, char **right)
158 char *string = *orig_string;
163 /* eat any whitespace */
164 while (isspace(*string))
167 /* split based on '=' */
168 temp = strsep(&string, "=");
173 /* take the right side and strip off the '"' */
174 while (isspace(*string))
181 temp = strsep(&string, "\"");
182 if (!string || *temp == '\0')
185 *orig_string = string;
190 static int get_value(const char *left, char **orig_string, char **ret_string)
195 retval = get_pair(orig_string, &left_string, ret_string);
198 if (strcasecmp(left_string, left) != 0)
203 static int namedev_init_config(void)
212 struct config_device dev;
214 dbg("opening %s to read as config", udev_config_filename);
215 fd = fopen(udev_config_filename, "r");
217 dbg("can't open %s", udev_config_filename);
221 /* loop through the whole file */
225 temp = fgets(line, sizeof(line), fd);
230 dbg_parse("read %s", temp);
232 /* eat the whitespace at the beginning of the line */
233 while (isspace(*temp))
240 /* see if this is a comment */
241 if (*temp == COMMENT_CHARACTER)
244 memset(&dev, 0x00, sizeof(struct config_device));
247 temp2 = strsep(&temp, ",");
248 if (strcasecmp(temp2, TYPE_LABEL) == 0) {
253 retval = get_value("BUS", &temp, &temp3);
256 strfieldcpy(dev.bus, temp3);
259 temp2 = strsep(&temp, ",");
260 retval = get_pair(&temp, &temp2, &temp3);
263 strfieldcpy(dev.sysfs_file, temp2);
264 strfieldcpy(dev.sysfs_value, temp3);
266 /* NAME="new_name" */
267 temp2 = strsep(&temp, ",");
268 retval = get_value("NAME", &temp, &temp3);
271 strfieldcpy(dev.name, temp3);
273 dbg_parse("LABEL name='%s', bus='%s', "
274 "sysfs_file='%s', sysfs_value='%s'",
275 dev.name, dev.bus, dev.sysfs_file,
279 if (strcasecmp(temp2, TYPE_NUMBER) == 0) {
284 retval = get_value("BUS", &temp, &temp3);
287 strfieldcpy(dev.bus, temp3);
290 temp2 = strsep(&temp, ",");
291 retval = get_value("ID", &temp, &temp3);
294 strfieldcpy(dev.id, temp3);
296 /* NAME="new_name" */
297 temp2 = strsep(&temp, ",");
298 retval = get_value("NAME", &temp, &temp3);
301 strfieldcpy(dev.name, temp3);
303 dbg_parse("NUMBER name='%s', bus='%s', id='%s'",
304 dev.name, dev.bus, dev.id);
307 if (strcasecmp(temp2, TYPE_TOPOLOGY) == 0) {
312 retval = get_value("BUS", &temp, &temp3);
315 strfieldcpy(dev.bus, temp3);
318 temp2 = strsep(&temp, ",");
319 retval = get_value("PLACE", &temp, &temp3);
322 strfieldcpy(dev.place, temp3);
324 /* NAME="new_name" */
325 temp2 = strsep(&temp, ",");
326 retval = get_value("NAME", &temp, &temp3);
329 strfieldcpy(dev.name, temp3);
331 dbg_parse("TOPOLOGY name='%s', bus='%s', place='%s'",
332 dev.name, dev.bus, dev.place);
335 if (strcasecmp(temp2, TYPE_REPLACE) == 0) {
339 /* KERNEL="kernel_name" */
340 retval = get_value("KERNEL", &temp, &temp3);
343 strfieldcpy(dev.kernel_name, temp3);
345 /* NAME="new_name" */
346 temp2 = strsep(&temp, ",");
347 retval = get_value("NAME", &temp, &temp3);
350 strfieldcpy(dev.name, temp3);
351 dbg_parse("REPLACE name='%s', kernel_name='%s'",
352 dev.name, dev.kernel_name);
354 if (strcasecmp(temp2, TYPE_CALLOUT) == 0) {
359 retval = get_value("BUS", &temp, &temp3);
362 strfieldcpy(dev.bus, temp3);
364 /* PROGRAM="executable" */
365 temp2 = strsep(&temp, ",");
366 retval = get_value("PROGRAM", &temp, &temp3);
369 strfieldcpy(dev.exec_program, temp3);
372 temp2 = strsep(&temp, ",");
373 retval = get_value("ID", &temp, &temp3);
376 strfieldcpy(dev.id, temp3);
378 /* NAME="new_name" */
379 temp2 = strsep(&temp, ",");
380 retval = get_value("NAME", &temp, &temp3);
383 strfieldcpy(dev.name, temp3);
384 dbg_parse("CALLOUT name='%s', program='%s'",
385 dev.name, dev.exec_program);
388 retval = add_dev(&dev);
390 dbg("add_dev returned with error %d", retval);
394 dbg_parse("%s:%d:%Zd: error parsing '%s'", udev_config_filename,
395 lineno, temp - line, temp);
402 static int namedev_init_permissions(void)
409 struct config_device dev;
411 dbg("opening %s to read as permissions config", udev_config_permission_filename);
412 fd = fopen(udev_config_permission_filename, "r");
414 dbg("can't open %s", udev_config_permission_filename);
418 /* loop through the whole file */
420 temp = fgets(line, sizeof(line), fd);
424 dbg_parse("read %s", temp);
426 /* eat the whitespace at the beginning of the line */
427 while (isspace(*temp))
434 /* see if this is a comment */
435 if (*temp == COMMENT_CHARACTER)
438 memset(&dev, 0x00, sizeof(dev));
441 temp2 = strsep(&temp, ":");
443 dbg("cannot parse line: %s", line);
446 strncpy(dev.name, temp2, sizeof(dev.name));
448 temp2 = strsep(&temp, ":");
450 dbg("cannot parse line: %s", line);
453 strncpy(dev.owner, temp2, sizeof(dev.owner));
455 temp2 = strsep(&temp, ":");
457 dbg("cannot parse line: %s", line);
460 strncpy(dev.group, temp2, sizeof(dev.owner));
462 dev.mode = strtol(temp, NULL, 8);
464 dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
465 dev.name, dev.owner, dev.group,
467 retval = add_dev(&dev);
469 dbg("add_dev returned with error %d", retval);
479 static mode_t get_default_mode(struct sysfs_class_device *class_dev)
481 /* just default everyone to rw for the world! */
486 static int exec_callout(struct config_device *dev, char *value, int len)
496 char *args[CALLOUT_MAXARG];
499 dbg("callout to '%s'", dev->exec_program);
513 close(STDOUT_FILENO);
514 dup(fds[1]); /* dup write side of pipe to STDOUT */
515 if (strchr(dev->exec_program, ' ')) {
516 /* callout with arguments */
517 arg = dev->exec_program;
518 for (i=0; i < CALLOUT_MAXARG-1; i++) {
519 args[i] = strsep(&arg, " ");
524 dbg("too many args - %d", i);
527 retval = execve(args[0], args, main_envp);
529 retval = execve(dev->exec_program, main_argv, main_envp);
532 dbg("child execve failed");
535 return -1; /* avoid compiler warning */
537 /* parent reads from fds[0] */
541 res = read(fds[0], buffer, sizeof(buffer) - 1);
546 dbg("callout len %d too short\n", len);
550 dbg("callout value already set");
554 strncpy(value, buffer, len);
557 dbg("callout returned '%s'", value);
561 dbg("wait failed result %d", res);
566 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
567 dbg("callout program status 0x%x", status);
575 static int do_callout(struct sysfs_class_device *class_dev, struct udevice *udev)
577 struct config_device *dev;
578 struct list_head *tmp;
581 list_for_each(tmp, &config_device_list) {
582 dev = list_entry(tmp, struct config_device, node);
583 if (dev->type != CALLOUT)
586 if (exec_callout(dev, value, sizeof(value)))
588 if (strncmp(value, dev->id, sizeof(value)) != 0)
590 strfieldcpy(udev->name, dev->name);
591 if (dev->mode != 0) {
592 udev->mode = dev->mode;
593 strfieldcpy(udev->owner, dev->owner);
594 strfieldcpy(udev->group, dev->group);
596 dbg_parse("callout returned matching value '%s', '%s' becomes '%s'"
597 " - owner='%s', group='%s', mode =%#o",
598 dev->id, class_dev->name, udev->name,
599 dev->owner, dev->group, dev->mode);
605 static int do_label(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
607 struct sysfs_attribute *tmpattr = NULL;
608 struct config_device *dev;
609 struct list_head *tmp;
611 list_for_each(tmp, &config_device_list) {
612 dev = list_entry(tmp, struct config_device, node);
613 if (dev->type != LABEL)
616 dbg_parse("look for device attribute '%s'", dev->sysfs_file);
617 /* try to find the attribute in the class device directory */
618 tmpattr = sysfs_get_classdev_attr(class_dev, dev->sysfs_file);
622 /* look in the class device directory if present */
624 tmpattr = sysfs_get_device_attr(sysfs_device, dev->sysfs_file);
632 tmpattr->value[strlen(tmpattr->value)-1] = 0x00;
633 dbg_parse("compare attribute '%s' value '%s' with '%s'",
634 dev->sysfs_file, tmpattr->value, dev->sysfs_value);
635 if (strcmp(dev->sysfs_value, tmpattr->value) != 0)
638 strfieldcpy(udev->name, dev->name);
639 if (dev->mode != 0) {
640 udev->mode = dev->mode;
641 strfieldcpy(udev->owner, dev->owner);
642 strfieldcpy(udev->group, dev->group);
644 dbg_parse("found matching attribute '%s', '%s' becomes '%s' "
645 "- owner='%s', group='%s', mode=%#o",
646 dev->sysfs_file, class_dev->name, udev->name,
647 dev->owner, dev->group, dev->mode);
654 static int do_number(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
656 struct config_device *dev;
657 struct list_head *tmp;
658 char path[SYSFS_PATH_MAX];
662 /* we have to have a sysfs device for NUMBER to work */
666 list_for_each(tmp, &config_device_list) {
667 dev = list_entry(tmp, struct config_device, node);
668 if (dev->type != NUMBER)
672 strfieldcpy(path, sysfs_device->path);
673 temp = strrchr(path, '/');
674 dbg_parse("search '%s' in '%s', path='%s'", dev->id, temp, path);
675 if (strstr(temp, dev->id) != NULL) {
679 temp = strrchr(path, '/');
680 dbg_parse("search '%s' in '%s', path='%s'", dev->id, temp, path);
681 if (strstr(temp, dev->id) != NULL)
686 strfieldcpy(udev->name, dev->name);
687 if (dev->mode != 0) {
688 udev->mode = dev->mode;
689 strfieldcpy(udev->owner, dev->owner);
690 strfieldcpy(udev->group, dev->group);
692 dbg_parse("found matching id '%s', '%s' becomes '%s'"
693 " - owner='%s', group ='%s', mode=%#o",
694 dev->id, class_dev->name, udev->name,
695 dev->owner, dev->group, dev->mode);
702 static int do_topology(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
704 struct config_device *dev;
705 struct list_head *tmp;
706 char path[SYSFS_PATH_MAX];
710 /* we have to have a sysfs device for TOPOLOGY to work */
714 list_for_each(tmp, &config_device_list) {
715 dev = list_entry(tmp, struct config_device, node);
716 if (dev->type != TOPOLOGY)
720 strfieldcpy(path, sysfs_device->path);
721 temp = strrchr(path, '/');
722 dbg_parse("search '%s' in '%s', path='%s'", dev->place, temp, path);
723 if (strstr(temp, dev->place) != NULL) {
727 temp = strrchr(path, '/');
728 dbg_parse("search '%s' in '%s', path='%s'", dev->place, temp, path);
729 if (strstr(temp, dev->place) != NULL)
735 strfieldcpy(udev->name, dev->name);
736 if (dev->mode != 0) {
737 udev->mode = dev->mode;
738 strfieldcpy(udev->owner, dev->owner);
739 strfieldcpy(udev->group, dev->group);
741 dbg_parse("found matching place '%s', '%s' becomes '%s'"
742 " - owner='%s', group ='%s', mode=%#o",
743 dev->place, class_dev->name, udev->name,
744 dev->owner, dev->group, dev->mode);
750 static int do_replace(struct sysfs_class_device *class_dev, struct udevice *udev)
752 struct config_device *dev;
753 struct list_head *tmp;
755 list_for_each(tmp, &config_device_list) {
756 dev = list_entry(tmp, struct config_device, node);
757 if (dev->type != REPLACE)
760 dbg_parse("compare name '%s' with '%s'",
761 dev->kernel_name, dev->name);
762 if (strcmp(dev->kernel_name, class_dev->name) != 0)
765 strfieldcpy(udev->name, dev->name);
766 if (dev->mode != 0) {
767 udev->mode = dev->mode;
768 strfieldcpy(udev->owner, dev->owner);
769 strfieldcpy(udev->group, dev->group);
771 dbg_parse("found name, '%s' becomes '%s' - owner='%s', group='%s', mode = %#o",
772 dev->kernel_name, udev->name,
773 dev->owner, dev->group, dev->mode);
780 static void do_kernelname(struct sysfs_class_device *class_dev, struct udevice *udev)
782 struct config_device *dev;
783 struct list_head *tmp;
786 strfieldcpy(udev->name, class_dev->name);
787 list_for_each(tmp, &config_device_list) {
788 dev = list_entry(tmp, struct config_device, node);
789 len = strlen(dev->name);
790 if (dev->name[len-1] == '*') {
792 if (strncmp(dev->name, class_dev->name, len))
795 if (strcmp(dev->name, class_dev->name))
798 if (dev->mode != 0) {
799 dbg_parse("found permissions for '%s'", class_dev->name);
800 udev->mode = dev->mode;
801 strfieldcpy(udev->owner, dev->owner);
802 strfieldcpy(udev->group, dev->group);
807 static int get_attr(struct sysfs_class_device *class_dev, struct udevice *udev)
809 struct sysfs_device *sysfs_device = NULL;
810 struct sysfs_class_device *class_dev_parent = NULL;
816 /* find the sysfs_device for this class device */
817 /* Wouldn't it really be nice if libsysfs could do this for us? */
818 if (class_dev->sysdevice) {
819 sysfs_device = class_dev->sysdevice;
821 /* bah, let's go backwards up a level to see if the device is there,
822 * as block partitions don't point to the physical device. Need to fix that
823 * up in the kernel...
825 if (strstr(class_dev->path, "block")) {
826 dbg_parse("looking at block device...");
827 if (isdigit(class_dev->path[strlen(class_dev->path)-1])) {
828 char path[SYSFS_PATH_MAX];
830 dbg_parse("really is a partition...");
831 strfieldcpy(path, class_dev->path);
832 temp = strrchr(path, '/');
834 dbg_parse("looking for a class device at '%s'", path);
835 class_dev_parent = sysfs_open_class_device(path);
836 if (class_dev_parent == NULL) {
837 dbg("sysfs_open_class_device at '%s' failed", path);
839 dbg_parse("class_dev_parent->name=%s", class_dev_parent->name);
840 if (class_dev_parent->sysdevice)
841 sysfs_device = class_dev_parent->sysdevice;
848 dbg_parse("sysfs_device->path='%s'", sysfs_device->path);
849 dbg_parse("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
851 dbg_parse("class_dev->name = '%s'", class_dev->name);
854 /* rules are looked at in priority order */
855 retval = do_callout(class_dev, udev);
859 retval = do_label(class_dev, udev, sysfs_device);
863 retval = do_number(class_dev, udev, sysfs_device);
867 retval = do_topology(class_dev, udev, sysfs_device);
871 retval = do_replace(class_dev, udev);
875 do_kernelname(class_dev, udev);
879 /* substitute placeholder in NAME */
881 char *pos = strchr(udev->name, '%');
883 char name[NAME_SIZE];
886 strfieldcpy(name, pos+2);
892 strcat(udev->name, sysfs_device->bus_id);
893 dbg("substitute bus_id '%s'", sysfs_device->bus_id);
896 dig = class_dev->name + strlen(class_dev->name);
897 while (isdigit(*(dig-1)))
899 strcat(udev->name, dig);
900 dbg("substitute kernel number '%s'", dig);
903 sprintf(pos, "%u", udev->minor);
904 dbg("substitute minor number '%u'", udev->minor);
907 sprintf(pos, "%u", udev->major);
908 dbg("substitute major number '%u'", udev->major);
911 dbg("unknown substitution type '%%%c'", pos[1]);
914 strcat(udev->name, name);
920 /* mode was never set above */
922 udev->mode = get_default_mode(class_dev);
923 udev->owner[0] = 0x00;
924 udev->group[0] = 0x00;
927 if (class_dev_parent)
928 sysfs_close_class_device(class_dev_parent);
933 int namedev_name_device(struct sysfs_class_device *class_dev, struct udevice *dev)
937 retval = get_attr(class_dev, dev);
939 dbg("get_attr failed");
944 int namedev_init(void)
948 retval = namedev_init_config();
952 retval = namedev_init_permissions();