* udev_rules.c
*
* Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
- * Copyright (C) 2003-2005 Kay Sievers <kay.sievers@vrfy.org>
+ * Copyright (C) 2003-2006 Kay Sievers <kay.sievers@vrfy.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation version 2 of the License.
- *
+ *
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
- *
+ *
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
return rc;
}
-static int match_name_and_get_number(const char *base, const char *devname)
-{
- size_t baselen;
- char *endptr;
- int num;
-
- baselen = strlen(base);
- if (strncmp(base, devname, baselen) != 0)
- return -1;
- if (devname[baselen] == '\0')
- return 0;
- if (!isdigit(devname[baselen]))
- return -1;
- num = strtoul(&devname[baselen], &endptr, 10);
- if (endptr[0] != '\0')
- return -1;
- return num;
-}
-
-/* finds the lowest positive device number such that <name>N isn't present in the udevdb
- * if <name> doesn't exist, 0 is returned, N otherwise */
-static int find_free_number(const char *base, const char *devpath)
-{
- char db_devpath[PATH_SIZE];
- char filename[PATH_SIZE];
- struct udevice *udev_db;
- int num = 0;
-
- /* check if the device already owns a matching name */
- udev_db = udev_device_init();
- if (udev_db == NULL)
- return -1;
- if (udev_db_get_device(udev_db, devpath) == 0) {
- struct name_entry *name_loop;
- int devnum;
-
- devnum = match_name_and_get_number(base, udev_db->name);
- if (devnum >= 0) {
- num = devnum;
- dbg("device '%s', already has the node '%s' with num %u, use it", devpath, base, num);
- goto out;
- }
- list_for_each_entry(name_loop, &udev_db->symlink_list, node) {
- devnum = match_name_and_get_number(base, name_loop->name);
- if (devnum >= 0) {
- num = devnum;
- dbg("device '%s', already has a symlink '%s' with num %u, use it", devpath, base, num);
- goto out;
- }
- }
- }
-
- /* just search the database again and again until a free name is found */
- strlcpy(filename, base, sizeof(filename));
- while (1) {
- dbg("look for existing node '%s'", filename);
- if (udev_db_lookup_name(filename, db_devpath, sizeof(db_devpath)) != 0) {
- dbg("free num=%d", num);
- break;
- }
-
- num++;
- if (num > 100000) {
- err("find_free_number aborted at num=%d", num);
- num = -1;
- break;
- }
- snprintf(filename, sizeof(filename), "%s%d", base, num);
- filename[sizeof(filename)-1] = '\0';
- }
-
-out:
- udev_device_cleanup(udev_db);
- return num;
-}
-
#define WAIT_LOOP_PER_SECOND 50
static int wait_for_sysfs(struct udevice *udev, const char *file, int timeout)
{
- char filename[PATH_SIZE];
+ char devicepath[PATH_SIZE];
+ char filepath[PATH_SIZE];
struct stat stats;
int loop = timeout * WAIT_LOOP_PER_SECOND;
- snprintf(filename, sizeof(filename), "%s%s/%s", sysfs_path, udev->dev->devpath, file);
- filename[sizeof(filename)-1] = '\0';
- dbg("wait %i sec for '%s'", timeout, filename);
+ strlcpy(devicepath, sysfs_path, sizeof(devicepath));
+ strlcat(devicepath, udev->dev->devpath, sizeof(devicepath));
+ strlcpy(filepath, devicepath, sizeof(filepath));
+ strlcat(filepath, "/", sizeof(filepath));
+ strlcat(filepath, file, sizeof(filepath));
+ dbg("will wait %i sec for '%s'", timeout, filepath);
while (--loop) {
- if (stat(filename, &stats) == 0) {
- info("file '%s' appeared after %i loops", filename, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
+ /* lookup file */
+ if (stat(filepath, &stats) == 0) {
+ info("file '%s' appeared after %i loops", filepath, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
return 0;
}
- info("wait for %i mseconds", 1000 / WAIT_LOOP_PER_SECOND);
+ /* make sure the device does not have disappeared in the meantime */
+ if (stat(devicepath, &stats) != 0) {
+ info("device disappeared while waiting for '%s'", filepath);
+ return -2;
+ }
+ info("wait for '%s' for %i mseconds", filepath, 1000 / WAIT_LOOP_PER_SECOND);
usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
}
- err("waiting for '%s' failed", filename);
+ err("waiting for '%s' failed", filepath);
return -1;
}
-void apply_format(struct udevice *udev, char *string, size_t maxsize)
+void udev_rules_apply_format(struct udevice *udev, char *string, size_t maxsize)
{
char temp[PATH_SIZE];
char temp2[PATH_SIZE];
int len;
int i;
int count;
- unsigned int next_free_number;
enum subst_type {
SUBST_UNKNOWN,
SUBST_DEVPATH,
SUBST_MINOR,
SUBST_RESULT,
SUBST_SYSFS,
- SUBST_ENUM,
SUBST_PARENT,
SUBST_TEMP_NODE,
SUBST_ROOT,
- SUBST_MODALIAS,
SUBST_ENV,
};
static const struct subst_map {
{ .name = "minor", .fmt = 'm', .type = SUBST_MINOR },
{ .name = "result", .fmt = 'c', .type = SUBST_RESULT },
{ .name = "sysfs", .fmt = 's', .type = SUBST_SYSFS },
- { .name = "enum", .fmt = 'e', .type = SUBST_ENUM },
{ .name = "parent", .fmt = 'P', .type = SUBST_PARENT },
{ .name = "tempnode", .fmt = 'N', .type = SUBST_TEMP_NODE },
{ .name = "root", .fmt = 'r', .type = SUBST_ROOT },
- { .name = "modalias", .fmt = 'A', .type = SUBST_MODALIAS },
{ .name = "env", .fmt = 'E', .type = SUBST_ENV },
{ NULL, '\0', 0 }
};
goto found;
}
}
- }
- else if (head[0] == '%') {
+ } else if (head[0] == '%') {
/* substitute format char */
if (head[1] == '\0')
break;
dbg("substitute sysfs value '%s'", temp2);
}
break;
- case SUBST_ENUM:
- next_free_number = find_free_number(string, udev->dev->devpath);
- if (next_free_number > 0) {
- sprintf(temp2, "%d", next_free_number);
- strlcat(string, temp2, maxsize);
- }
- break;
case SUBST_PARENT:
{
struct sysfs_device *dev_parent;
snprintf(udev->tmp_node, sizeof(udev->tmp_node), "%s/.tmp-%u-%u",
udev_root, major(udev->devt), minor(udev->devt));
udev->tmp_node[sizeof(udev->tmp_node)-1] = '\0';
- udev_make_node(udev, udev->tmp_node, udev->devt, 0600, 0, 0);
+ udev_node_mknod(udev, udev->tmp_node, udev->devt, 0600, 0, 0);
}
strlcat(string, udev->tmp_node, maxsize);
dbg("substitute temporary device node name '%s'", udev->tmp_node);
strlcat(string, udev_root, maxsize);
dbg("substitute udev_root '%s'", udev_root);
break;
- case SUBST_MODALIAS:
- {
- const char *value;
-
- value = sysfs_attr_get_value(udev->dev->devpath, "modalias");
- if (value != NULL) {
- strlcat(string, value, maxsize);
- dbg("substitute MODALIAS '%s'", temp2);
- }
- }
- break;
case SUBST_ENV:
if (attr == NULL) {
dbg("missing attribute");
char *key_value;
char *pos;
- if (key->operation == KEY_OP_UNSET)
+ if (key->operation != KEY_OP_MATCH &&
+ key->operation != KEY_OP_NOMATCH)
return 0;
strlcpy(value, rule->buf + key->val_off, sizeof(value));
if (match_key("DEVPATH", rule, &rule->devpath, udev->dev->devpath))
goto nomatch;
- if (rule->modalias.operation != KEY_OP_UNSET) {
- const char *value;
-
- value = sysfs_attr_get_value(udev->dev->devpath, "modalias");
- if (value == NULL) {
- dbg("MODALIAS value not found");
- goto nomatch;
- }
- if (match_key("MODALIAS", rule, &rule->modalias, value))
- goto nomatch;
- }
+ /* compare NAME against a previously assigned value */
+ if (match_key("NAME", rule, &rule->name, udev->name))
+ goto nomatch;
for (i = 0; i < rule->env.count; i++) {
struct key_pair *pair = &rule->env.keys[i];
/* we only check for matches, assignments will be handled later */
- if (pair->key.operation != KEY_OP_ASSIGN) {
+ if (pair->key.operation == KEY_OP_MATCH ||
+ pair->key.operation == KEY_OP_NOMATCH) {
const char *key_name = key_pair_name(rule, pair);
const char *value = getenv(key_name);
}
if (rule->wait_for_sysfs.operation != KEY_OP_UNSET) {
- int match;
+ int found;
- match = (wait_for_sysfs(udev, key_val(rule, &rule->wait_for_sysfs), 3) == 0);
- if (match && (rule->wait_for_sysfs.operation != KEY_OP_NOMATCH)) {
- dbg("WAIT_FOR_SYSFS is true (matching value)");
- return 0;
- }
- if (!match && (rule->wait_for_sysfs.operation == KEY_OP_NOMATCH)) {
- dbg("WAIT_FOR_SYSFS is true, (non matching value)");
- return 0;
+ found = (wait_for_sysfs(udev, key_val(rule, &rule->wait_for_sysfs), 3) == 0);
+ if (!found && (rule->wait_for_sysfs.operation != KEY_OP_NOMATCH)) {
+ dbg("WAIT_FOR_SYSFS failed");
+ goto nomatch;
}
- dbg("WAIT_FOR_SYSFS is false");
- return -1;
}
/* walk up the chain of parent devices and find a match */
udev->dev_parent = udev->dev;
while (1) {
/* check for matching driver */
- if (rule->driver.operation != KEY_OP_UNSET) {
- if (match_key("DRIVER", rule, &rule->driver, udev->dev_parent->driver))
- goto try_parent;
- }
+ if (match_key("DRIVER", rule, &rule->driver, udev->dev_parent->driver))
+ goto try_parent;
/* check for matching subsystem/bus value */
- if (rule->bus.operation != KEY_OP_UNSET) {
- if (match_key("BUS", rule, &rule->bus, udev->dev_parent->subsystem))
- goto try_parent;
- }
+ if (match_key("BUS", rule, &rule->bus, udev->dev_parent->subsystem))
+ goto try_parent;
/* check for matching bus id (device name) */
- if (rule->id.operation != KEY_OP_UNSET) {
- if (match_key("ID", rule, &rule->id, udev->dev_parent->kernel_name))
- goto try_parent;
- }
+ if (match_key("ID", rule, &rule->id, udev->dev_parent->kernel_name))
+ goto try_parent;
/* check for matching sysfs pairs */
if (rule->sysfs.count) {
size_t len;
value = sysfs_attr_get_value(udev->dev_parent->devpath, key_name);
+ if (value == NULL)
+ value = sysfs_attr_get_value(udev->dev->devpath, key_name);
if (value == NULL)
goto try_parent;
strlcpy(val, value, sizeof(val));
char result[PATH_SIZE];
strlcpy(program, key_val(rule, &rule->program), sizeof(program));
- apply_format(udev, program, sizeof(program));
+ udev_rules_apply_format(udev, program, sizeof(program));
if (run_program(program, udev->dev->subsystem, result, sizeof(result), NULL, (udev_log_priority >= LOG_INFO)) != 0) {
dbg("PROGRAM is false");
udev->program_result[0] = '\0';
int rc = -1;
strlcpy(import, key_val(rule, &rule->import), sizeof(import));
- apply_format(udev, import, sizeof(import));
+ udev_rules_apply_format(udev, import, sizeof(import));
dbg("check for IMPORT import='%s'", import);
if (rule->import_type == IMPORT_PROGRAM) {
rc = import_program_into_env(udev, import);
if (pair->key.operation == KEY_OP_ASSIGN) {
const char *key_name = key_pair_name(rule, pair);
const char *value = key_val(rule, &pair->key);
+ char *key_value = name_list_key_add(&udev->env_list, key_name, value);
+ if (key_value == NULL)
+ break;
- name_list_key_add(&udev->env_list, key_name, value);
- setenv(key_name, value, 1);
- dbg("export ENV '%s=%s'", key_name, value);
+ udev_rules_apply_format(udev, key_value, NAME_SIZE);
+ putenv(key_value);
+ dbg("export ENV '%s'", key_value);
}
}
if (rule == NULL)
break;
- if (name_set && rule->name.operation != KEY_OP_UNSET) {
+ if (name_set &&
+ (rule->name.operation == KEY_OP_ASSIGN ||
+ rule->name.operation == KEY_OP_ASSIGN_FINAL ||
+ rule->name.operation == KEY_OP_ADD)) {
dbg("node name already set, rule ignored");
continue;
}
if (rule->owner.operation == KEY_OP_ASSIGN_FINAL)
udev->owner_final = 1;
strlcpy(udev->owner, key_val(rule, &rule->owner), sizeof(udev->owner));
- apply_format(udev, udev->owner, sizeof(udev->owner));
+ udev_rules_apply_format(udev, udev->owner, sizeof(udev->owner));
dbg("applied owner='%s' to '%s'", udev->owner, udev->dev->kernel_name);
}
if (!udev->group_final && rule->group.operation != KEY_OP_UNSET) {
if (rule->group.operation == KEY_OP_ASSIGN_FINAL)
udev->group_final = 1;
strlcpy(udev->group, key_val(rule, &rule->group), sizeof(udev->group));
- apply_format(udev, udev->group, sizeof(udev->group));
+ udev_rules_apply_format(udev, udev->group, sizeof(udev->group));
dbg("applied group='%s' to '%s'", udev->group, udev->dev->kernel_name);
}
name_list_cleanup(&udev->symlink_list);
}
strlcpy(temp, key_val(rule, &rule->symlink), sizeof(temp));
- apply_format(udev, temp, sizeof(temp));
+ udev_rules_apply_format(udev, temp, sizeof(temp));
count = replace_untrusted_chars(temp);
if (count)
info("%i untrusted character(s) replaced" , count);
}
/* set name, later rules with name set will be ignored */
- if (rule->name.operation != KEY_OP_UNSET) {
+ if (rule->name.operation == KEY_OP_ASSIGN ||
+ rule->name.operation == KEY_OP_ASSIGN_FINAL ||
+ rule->name.operation == KEY_OP_ADD) {
int count;
+
name_set = 1;
strlcpy(udev->name, key_val(rule, &rule->name), sizeof(udev->name));
- apply_format(udev, udev->name, sizeof(udev->name));
+ udev_rules_apply_format(udev, udev->name, sizeof(udev->name));
count = replace_untrusted_chars(udev->name);
if (count)
info("%i untrusted character(s) replaced", count);
}
if (!udev->run_final && rule->run.operation != KEY_OP_UNSET) {
- char program[PATH_SIZE];
-
if (rule->run.operation == KEY_OP_ASSIGN_FINAL)
udev->run_final = 1;
if (rule->run.operation == KEY_OP_ASSIGN || rule->run.operation == KEY_OP_ASSIGN_FINAL) {
info("reset run list");
name_list_cleanup(&udev->run_list);
}
- strlcpy(program, key_val(rule, &rule->run), sizeof(program));
- dbg("add run '%s'", program);
- name_list_add(&udev->run_list, program, 0);
+ dbg("add run '%s'", key_val(rule, &rule->run));
+ name_list_add(&udev->run_list, key_val(rule, &rule->run), 0);
}
if (rule->last_rule) {
}
if (!udev->run_final && rule->run.operation != KEY_OP_UNSET) {
- char program[PATH_SIZE];
-
if (rule->run.operation == KEY_OP_ASSIGN || rule->run.operation == KEY_OP_ASSIGN_FINAL) {
info("reset run list");
name_list_cleanup(&udev->run_list);
}
- strlcpy(program, key_val(rule, &rule->run), sizeof(program));
- apply_format(udev, program, sizeof(program));
- dbg("add run '%s'", program);
- name_list_add(&udev->run_list, program, 0);
+ dbg("add run '%s'", key_val(rule, &rule->run));
+ name_list_add(&udev->run_list, key_val(rule, &rule->run), 0);
if (rule->run.operation == KEY_OP_ASSIGN_FINAL)
break;
}
~ianmdlvl / elogind.git / blobdiff