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95776dc6ec
systemd-stable/udev_rules.c
Kay Sievers 95776dc6ec consistent key naming to match only the event device or include all parent devices 
This scheme is more consistent and makes it obvious if a match happens
against the event device only, or the full chain of parent devices.

The old key names are now:
  BUS -> SUBSYSTEMS
  ID -> KERNELS
  SYSFS -> ATTRS
  DRIVER -> DRIVERS

Match keys for the event device:
  KERNEL
  SUBSYSTEM
  ATTR
  DRIVER (in a future release, for now the same as DRIVERS)

Match keys for all devices along the parent device chain:
  KERNELS
  SUBSYSTEMS
  ATTRS
  DRIVERS

ID, BUS, SYSFS are no longer mentioned in the man page but still work.
DRIVER must be converted to DRIVERS to match the new scheme. For now,
an error is logged, if DRIVER is used. In a future release, the DRIVER
key behaviour will change.
2006-08-19 16:06:25 +02:00

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/*
* udev_rules.c
*
* Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
* 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.
*
*/
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <fcntl.h>
#include <ctype.h>
#include <unistd.h>
#include <errno.h>
#include <syslog.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include "udev.h"
#include "udev_rules.h"
/* extract possible {attr} and move str behind it */
static char *get_format_attribute(char **str)
{
char *pos;
char *attr = NULL;
if (*str[0] == '{') {
pos = strchr(*str, '}');
if (pos == NULL) {
err("missing closing brace for format");
return NULL;
}
pos[0] = '\0';
attr = *str+1;
*str = pos+1;
dbg("attribute='%s', str='%s'", attr, *str);
}
return attr;
}
/* extract possible format length and move str behind it*/
static int get_format_len(char **str)
{
int num;
char *tail;
if (isdigit(*str[0])) {
num = (int) strtoul(*str, &tail, 10);
if (num > 0) {
*str = tail;
dbg("format length=%i", num);
return num;
} else {
err("format parsing error '%s'", *str);
}
}
return -1;
}
static int get_key(char **line, char **key, char **value)
{
char *linepos;
char *temp;
linepos = *line;
if (!linepos)
return -1;
if (strchr(linepos, '\\')) {
dbg("escaped characters are not supported, skip");
return -1;
}
/* skip whitespace */
while (isspace(linepos[0]))
linepos++;
/* get the key */
*key = linepos;
while (1) {
linepos++;
if (linepos[0] == '\0')
return -1;
if (isspace(linepos[0]))
break;
if (linepos[0] == '=')
break;
}
/* terminate key */
linepos[0] = '\0';
linepos++;
/* skip whitespace */
while (isspace(linepos[0]))
linepos++;
/* get the value*/
if (linepos[0] == '"') {
linepos++;
temp = strchr(linepos, '"');
if (!temp) {
dbg("missing closing quote");
return -1;
}
dbg("value is quoted");
temp[0] = '\0';
} else if (linepos[0] == '\'') {
linepos++;
temp = strchr(linepos, '\'');
if (!temp) {
dbg("missing closing quote");
return -1;
}
dbg("value is quoted");
temp[0] = '\0';
} else if (linepos[0] == '\0') {
dbg("value is empty");
} else {
temp = linepos;
while (temp[0] && !isspace(temp[0]))
temp++;
temp[0] = '\0';
}
*value = linepos;
return 0;
}
static int import_keys_into_env(struct udevice *udev, const char *buf, size_t bufsize)
{
char line[LINE_SIZE];
const char *bufline;
char *linepos;
char *variable;
char *value;
size_t cur;
size_t count;
int lineno;
/* loop through the whole buffer */
lineno = 0;
cur = 0;
while (cur < bufsize) {
count = buf_get_line(buf, bufsize, cur);
bufline = &buf[cur];
cur += count+1;
lineno++;
if (count >= sizeof(line)) {
err("line too long, conf line skipped %s, line %d", udev_config_filename, lineno);
continue;
}
/* eat the whitespace */
while ((count > 0) && isspace(bufline[0])) {
bufline++;
count--;
}
if (count == 0)
continue;
/* see if this is a comment */
if (bufline[0] == COMMENT_CHARACTER)
continue;
memcpy(line, bufline, count);
line[count] = '\0';
linepos = line;
if (get_key(&linepos, &variable, &value) == 0) {
dbg("import '%s=%s'", variable, value);
name_list_key_add(&udev->env_list, variable, value);
setenv(variable, value, 1);
}
}
return 0;
}
static int import_file_into_env(struct udevice *udev, const char *filename)
{
char *buf;
size_t bufsize;
if (file_map(filename, &buf, &bufsize) != 0) {
err("can't open '%s': %s", filename, strerror(errno));
return -1;
}
import_keys_into_env(udev, buf, bufsize);
file_unmap(buf, bufsize);
return 0;
}
static int import_program_into_env(struct udevice *udev, const char *program)
{
char result[1024];
size_t reslen;
if (run_program(program, udev->dev->subsystem, result, sizeof(result), &reslen, (udev_log_priority >= LOG_INFO)) != 0)
return -1;
return import_keys_into_env(udev, result, reslen);
}
static int import_parent_into_env(struct udevice *udev, const char *filter)
{
struct sysfs_device *dev_parent;
int rc = -1;
dev_parent = sysfs_device_get_parent(udev->dev);
if (dev_parent != NULL) {
struct udevice *udev_parent;
struct name_entry *name_loop;
dbg("found parent '%s', get the node name", dev_parent->devpath);
udev_parent = udev_device_init();
if (udev_parent == NULL)
return -1;
/* import the udev_db of the parent */
if (udev_db_get_device(udev_parent, dev_parent->devpath) == 0) {
dbg("import stored parent env '%s'", udev_parent->name);
list_for_each_entry(name_loop, &udev_parent->env_list, node) {
char name[NAME_SIZE];
char *pos;
strlcpy(name, name_loop->name, sizeof(name));
pos = strchr(name, '=');
if (pos) {
pos[0] = '\0';
pos++;
if (strcmp_pattern(filter, name) == 0) {
dbg("import key '%s'", name_loop->name);
name_list_add(&udev->env_list, name_loop->name, 0);
setenv(name, pos, 1);
} else
dbg("skip key '%s'", name_loop->name);
}
}
rc = 0;
} else
dbg("parent not found in database");
udev_device_cleanup(udev_parent);
}
return rc;
}
#define WAIT_LOOP_PER_SECOND 50
static int wait_for_sysfs(struct udevice *udev, const char *file, int timeout)
{
char devicepath[PATH_SIZE];
char filepath[PATH_SIZE];
struct stat stats;
int loop = timeout * WAIT_LOOP_PER_SECOND;
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) {
/* lookup file */
if (stat(filepath, &stats) == 0) {
info("file '%s' appeared after %i loops", filepath, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
return 0;
}
/* 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", filepath);
return -1;
}
void udev_rules_apply_format(struct udevice *udev, char *string, size_t maxsize)
{
char temp[PATH_SIZE];
char temp2[PATH_SIZE];
char *head, *tail, *pos, *cpos, *attr, *rest;
int len;
int i;
int count;
enum subst_type {
SUBST_UNKNOWN,
SUBST_DEVPATH,
SUBST_KERNEL,
SUBST_KERNEL_NUMBER,
SUBST_ID,
SUBST_MAJOR,
SUBST_MINOR,
SUBST_RESULT,
SUBST_ATTR,
SUBST_PARENT,
SUBST_TEMP_NODE,
SUBST_ROOT,
SUBST_ENV,
};
static const struct subst_map {
char *name;
char fmt;
enum subst_type type;
} map[] = {
{ .name = "devpath", .fmt = 'p', .type = SUBST_DEVPATH },
{ .name = "number", .fmt = 'n', .type = SUBST_KERNEL_NUMBER },
{ .name = "kernel", .fmt = 'k', .type = SUBST_KERNEL },
{ .name = "id", .fmt = 'b', .type = SUBST_ID },
{ .name = "major", .fmt = 'M', .type = SUBST_MAJOR },
{ .name = "minor", .fmt = 'm', .type = SUBST_MINOR },
{ .name = "result", .fmt = 'c', .type = SUBST_RESULT },
{ .name = "attr", .fmt = 's', .type = SUBST_ATTR },
{ .name = "sysfs", .fmt = 's', .type = SUBST_ATTR },
{ .name = "parent", .fmt = 'P', .type = SUBST_PARENT },
{ .name = "tempnode", .fmt = 'N', .type = SUBST_TEMP_NODE },
{ .name = "root", .fmt = 'r', .type = SUBST_ROOT },
{ .name = "env", .fmt = 'E', .type = SUBST_ENV },
{ NULL, '\0', 0 }
};
enum subst_type type;
const struct subst_map *subst;
head = string;
while (1) {
len = -1;
while (head[0] != '\0') {
if (head[0] == '$') {
/* substitute named variable */
if (head[1] == '\0')
break;
if (head[1] == '$') {
strlcpy(temp, head+2, sizeof(temp));
strlcpy(head+1, temp, maxsize);
head++;
continue;
}
head[0] = '\0';
for (subst = map; subst->name; subst++) {
if (strncasecmp(&head[1], subst->name, strlen(subst->name)) == 0) {
type = subst->type;
tail = head + strlen(subst->name)+1;
dbg("will substitute format name '%s'", subst->name);
goto found;
}
}
} else if (head[0] == '%') {
/* substitute format char */
if (head[1] == '\0')
break;
if (head[1] == '%') {
strlcpy(temp, head+2, sizeof(temp));
strlcpy(head+1, temp, maxsize);
head++;
continue;
}
head[0] = '\0';
tail = head+1;
len = get_format_len(&tail);
for (subst = map; subst->name; subst++) {
if (tail[0] == subst->fmt) {
type = subst->type;
tail++;
dbg("will substitute format char '%c'", subst->fmt);
goto found;
}
}
}
head++;
}
break;
found:
attr = get_format_attribute(&tail);
strlcpy(temp, tail, sizeof(temp));
dbg("format=%i, string='%s', tail='%s'", type ,string, tail);
switch (type) {
case SUBST_DEVPATH:
strlcat(string, udev->dev->devpath, maxsize);
dbg("substitute devpath '%s'", udev->dev->devpath);
break;
case SUBST_KERNEL:
strlcat(string, udev->dev->kernel, maxsize);
dbg("substitute kernel name '%s'", udev->dev->kernel);
break;
case SUBST_KERNEL_NUMBER:
strlcat(string, udev->dev->kernel_number, maxsize);
dbg("substitute kernel number '%s'", udev->dev->kernel_number);
break;
case SUBST_ID:
if (udev->dev_parent != NULL) {
strlcat(string, udev->dev_parent->kernel, maxsize);
dbg("substitute id '%s'", udev->dev_parent->kernel);
}
break;
case SUBST_MAJOR:
sprintf(temp2, "%d", major(udev->devt));
strlcat(string, temp2, maxsize);
dbg("substitute major number '%s'", temp2);
break;
case SUBST_MINOR:
sprintf(temp2, "%d", minor(udev->devt));
strlcat(string, temp2, maxsize);
dbg("substitute minor number '%s'", temp2);
break;
case SUBST_RESULT:
if (udev->program_result[0] == '\0')
break;
/* get part part of the result string */
i = 0;
if (attr != NULL)
i = strtoul(attr, &rest, 10);
if (i > 0) {
dbg("request part #%d of result string", i);
cpos = udev->program_result;
while (--i) {
while (cpos[0] != '\0' && !isspace(cpos[0]))
cpos++;
while (isspace(cpos[0]))
cpos++;
}
if (i > 0) {
err("requested part of result string not found");
break;
}
strlcpy(temp2, cpos, sizeof(temp2));
/* %{2+}c copies the whole string from the second part on */
if (rest[0] != '+') {
cpos = strchr(temp2, ' ');
if (cpos)
cpos[0] = '\0';
}
strlcat(string, temp2, maxsize);
dbg("substitute part of result string '%s'", temp2);
} else {
strlcat(string, udev->program_result, maxsize);
dbg("substitute result string '%s'", udev->program_result);
}
break;
case SUBST_ATTR:
if (attr == NULL) {
dbg("missing attribute");
break;
} else {
struct sysfs_device *dev_parent;
const char *value;
dev_parent = udev->dev;
do {
dbg("looking at '%s'", dev_parent->devpath);
value = sysfs_attr_get_value(dev_parent->devpath, attr);
if (value != NULL) {
strlcpy(temp2, value, sizeof(temp2));
break;
}
dev_parent = sysfs_device_get_parent(dev_parent);
} while (dev_parent != NULL);
/* strip trailing whitespace of sysfs value */
i = strlen(temp2);
while (i > 0 && isspace(temp2[i-1]))
temp2[--i] = '\0';
count = replace_untrusted_chars(temp2);
if (count)
info("%i untrusted character(s) replaced" , count);
strlcat(string, temp2, maxsize);
dbg("substitute sysfs value '%s'", temp2);
}
break;
case SUBST_PARENT:
{
struct sysfs_device *dev_parent;
dev_parent = sysfs_device_get_parent(udev->dev);
if (dev_parent != NULL) {
struct udevice *udev_parent;
dbg("found parent '%s', get the node name", dev_parent->devpath);
udev_parent = udev_device_init();
if (udev_parent != NULL) {
/* lookup the name in the udev_db with the DEVPATH of the parent */
if (udev_db_get_device(udev_parent, dev_parent->devpath) == 0) {
strlcat(string, udev_parent->name, maxsize);
dbg("substitute parent node name'%s'", udev_parent->name);
} else
dbg("parent not found in database");
udev_device_cleanup(udev_parent);
}
}
}
break;
case SUBST_TEMP_NODE:
if (udev->tmp_node[0] == '\0') {
dbg("create temporary device node for callout");
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_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);
break;
case SUBST_ROOT:
strlcat(string, udev_root, maxsize);
dbg("substitute udev_root '%s'", udev_root);
break;
case SUBST_ENV:
if (attr == NULL) {
dbg("missing attribute");
break;
}
pos = getenv(attr);
if (pos == NULL) {
dbg("env '%s' not available", attr);
break;
}
dbg("substitute env '%s=%s'", attr, pos);
strlcat(string, pos, maxsize);
break;
default:
err("unknown substitution type=%i", type);
break;
}
/* possibly truncate to format-char specified length */
if (len != -1) {
head[len] = '\0';
dbg("truncate to %i chars, subtitution string becomes '%s'", len, head);
}
strlcat(string, temp, maxsize);
}
}
static char *key_val(struct udev_rule *rule, struct key *key)
{
return rule->buf + key->val_off;
}
static char *key_pair_name(struct udev_rule *rule, struct key_pair *pair)
{
return rule->buf + pair->key_name_off;
}
static int match_key(const char *key_name, struct udev_rule *rule, struct key *key, const char *val)
{
int match;
char value[PATH_SIZE];
char *key_value;
char *pos;
if (key->operation != KEY_OP_MATCH &&
key->operation != KEY_OP_NOMATCH)
return 0;
strlcpy(value, rule->buf + key->val_off, sizeof(value));
key_value = value;
dbg("key %s value='%s'", key_name, key_value);
while (key_value) {
pos = strchr(key_value, '|');
if (pos) {
pos[0] = '\0';
pos++;
}
dbg("match %s '%s' <-> '%s'", key_name, key_value, val);
match = (strcmp_pattern(key_value, val) == 0);
if (match && (key->operation != KEY_OP_NOMATCH)) {
dbg("%s is true (matching value)", key_name);
return 0;
}
if (!match && (key->operation == KEY_OP_NOMATCH)) {
dbg("%s is true (non-matching value)", key_name);
return 0;
}
key_value = pos;
}
dbg("%s is false", key_name);
return -1;
}
/* match a single rule against a given device and possibly its parent devices */
static int match_rule(struct udevice *udev, struct udev_rule *rule)
{
int i;
if (match_key("ACTION", rule, &rule->action, udev->action))
goto nomatch;
if (match_key("KERNEL", rule, &rule->kernel, udev->dev->kernel))
goto nomatch;
if (match_key("SUBSYSTEM", rule, &rule->subsystem, udev->dev->subsystem))
goto nomatch;
if (match_key("DEVPATH", rule, &rule->devpath, udev->dev->devpath))
goto nomatch;
if (match_key("DRIVER", rule, &rule->driver, udev->dev->driver))
goto nomatch;
/* match NAME against a value assigned by an earlier rule */
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_MATCH ||
pair->key.operation == KEY_OP_NOMATCH) {
const char *key_name = key_pair_name(rule, pair);
const char *value = getenv(key_name);
if (!value) {
dbg("ENV{'%s'} is not set, treat as empty", key_name);
value = "";
}
if (match_key("ENV", rule, &pair->key, value))
goto nomatch;
}
}
if (rule->wait_for_sysfs.operation != KEY_OP_UNSET) {
int found;
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;
}
}
/* check for matching sysfs attrubute pairs */
if (rule->attr.count) {
dbg("check %i ATTR keys", rule->attr.count);
for (i = 0; i < rule->attr.count; i++) {
struct key_pair *pair = &rule->attr.keys[i];
const char *key_name = key_pair_name(rule, pair);
const char *key_value = key_val(rule, &pair->key);
const char *value;
char val[VALUE_SIZE];
size_t len;
value = sysfs_attr_get_value(udev->dev->devpath, key_name);
if (value == NULL)
goto nomatch;
strlcpy(val, value, sizeof(val));
/* strip trailing whitespace of value, if not asked to match for it */
len = strlen(key_value);
if (len > 0 && !isspace(key_value[len-1])) {
len = strlen(val);
while (len > 0 && isspace(val[len-1]))
val[--len] = '\0';
dbg("removed %zi trailing whitespace chars from '%s'", strlen(val)-len, val);
}
if (match_key("ATTR", rule, &pair->key, val))
goto nomatch;
}
dbg("all %i ATTR keys matched", rule->attr.count);
}
/* walk up the chain of parent devices and find a match */
udev->dev_parent = udev->dev;
while (1) {
/* check for matching kernel device name */
if (match_key("KERNELS", rule, &rule->kernels, udev->dev_parent->kernel))
goto try_parent;
/* check for matching subsystem value */
if (match_key("SUBSYSTEMS", rule, &rule->subsystems, udev->dev_parent->subsystem))
goto try_parent;
/* check for matching driver */
if (match_key("DRIVERS", rule, &rule->drivers, udev->dev_parent->driver))
goto try_parent;
/* check for matching sysfs attrubute pairs */
if (rule->attrs.count) {
dbg("check %i ATTRS keys", rule->attrs.count);
for (i = 0; i < rule->attrs.count; i++) {
struct key_pair *pair = &rule->attrs.keys[i];
const char *key_name = key_pair_name(rule, pair);
const char *key_value = key_val(rule, &pair->key);
const char *value;
char val[VALUE_SIZE];
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));
/* strip trailing whitespace of value, if not asked to match for it */
len = strlen(key_value);
if (len > 0 && !isspace(key_value[len-1])) {
len = strlen(val);
while (len > 0 && isspace(val[len-1]))
val[--len] = '\0';
dbg("removed %zi trailing whitespace chars from '%s'", strlen(val)-len, val);
}
if (match_key("ATTRS", rule, &pair->key, val))
goto try_parent;
}
dbg("all %i ATTRS keys matched", rule->attrs.count);
}
/* found matching device */
break;
try_parent:
/* move to parent device */
dbg("try parent sysfs device");
udev->dev_parent = sysfs_device_get_parent(udev->dev_parent);
if (udev->dev_parent == NULL)
goto nomatch;
dbg("looking at dev_parent->devpath='%s'", udev->dev_parent->devpath);
dbg("looking at dev_parent->kernel='%s'", udev->dev_parent->kernel);
}
/* execute external program */
if (rule->program.operation != KEY_OP_UNSET) {
char program[PATH_SIZE];
char result[PATH_SIZE];
strlcpy(program, key_val(rule, &rule->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';
if (rule->program.operation != KEY_OP_NOMATCH)
goto nomatch;
} else {
int count;
dbg("PROGRAM matches");
remove_trailing_chars(result, '\n');
count = replace_untrusted_chars(result);
if (count)
info("%i untrusted character(s) replaced" , count);
dbg("result is '%s'", result);
strlcpy(udev->program_result, result, sizeof(udev->program_result));
dbg("PROGRAM returned successful");
if (rule->program.operation == KEY_OP_NOMATCH)
goto nomatch;
}
dbg("PROGRAM key is true");
}
/* check for matching result of external program */
if (match_key("RESULT", rule, &rule->result, udev->program_result))
goto nomatch;
/* import variables returned from program or or file into environment */
if (rule->import.operation != KEY_OP_UNSET) {
char import[PATH_SIZE];
int rc = -1;
strlcpy(import, key_val(rule, &rule->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);
} else if (rule->import_type == IMPORT_FILE) {
dbg("import file import='%s'", import);
rc = import_file_into_env(udev, import);
} else if (rule->import_type == IMPORT_PARENT) {
dbg("import parent import='%s'", import);
rc = import_parent_into_env(udev, import);
}
if (rc != 0) {
dbg("IMPORT failed");
if (rule->import.operation != KEY_OP_NOMATCH)
goto nomatch;
} else
dbg("IMPORT '%s' imported", key_val(rule, &rule->import));
dbg("IMPORT key is true");
}
/* rule matches, if we have ENV assignments export it */
for (i = 0; i < rule->env.count; i++) {
struct key_pair *pair = &rule->env.keys[i];
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;
udev_rules_apply_format(udev, key_value, NAME_SIZE);
putenv(key_value);
dbg("export ENV '%s'", key_value);
}
}
return 0;
nomatch:
return -1;
}
int udev_rules_get_name(struct udev_rules *rules, struct udevice *udev)
{
struct udev_rule *rule;
int name_set = 0;
dbg("udev->dev->devpath='%s'", udev->dev->devpath);
dbg("udev->dev->kernel='%s'", udev->dev->kernel);
/* look for a matching rule to apply */
udev_rules_iter_init(rules);
while (1) {
rule = udev_rules_iter_next(rules);
if (rule == NULL)
break;
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;
}
dbg("process rule");
if (match_rule(udev, rule) == 0) {
/* apply options */
if (rule->ignore_device) {
info("rule applied, '%s' is ignored", udev->dev->kernel);
udev->ignore_device = 1;
return 0;
}
if (rule->ignore_remove) {
udev->ignore_remove = 1;
dbg("remove event should be ignored");
}
/* apply all_partitions option only at a main block device */
if (rule->partitions &&
strcmp(udev->dev->subsystem, "block") == 0 && udev->dev->kernel_number[0] == '\0') {
udev->partitions = rule->partitions;
dbg("creation of partition nodes requested");
}
/* apply permissions */
if (!udev->mode_final && rule->mode != 0000) {
if (rule->mode_operation == KEY_OP_ASSIGN_FINAL)
udev->mode_final = 1;
udev->mode = rule->mode;
dbg("applied mode=%#o to '%s'", rule->mode, udev->dev->kernel);
}
if (!udev->owner_final && rule->owner.operation != KEY_OP_UNSET) {
if (rule->owner.operation == KEY_OP_ASSIGN_FINAL)
udev->owner_final = 1;
strlcpy(udev->owner, key_val(rule, &rule->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);
}
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));
udev_rules_apply_format(udev, udev->group, sizeof(udev->group));
dbg("applied group='%s' to '%s'", udev->group, udev->dev->kernel);
}
/* collect symlinks */
if (!udev->symlink_final && rule->symlink.operation != KEY_OP_UNSET) {
char temp[PATH_SIZE];
char *pos, *next;
int count;
if (rule->symlink.operation == KEY_OP_ASSIGN_FINAL)
udev->symlink_final = 1;
if (rule->symlink.operation == KEY_OP_ASSIGN || rule->symlink.operation == KEY_OP_ASSIGN_FINAL) {
info("reset symlink list");
name_list_cleanup(&udev->symlink_list);
}
strlcpy(temp, key_val(rule, &rule->symlink), sizeof(temp));
udev_rules_apply_format(udev, temp, sizeof(temp));
count = replace_untrusted_chars(temp);
if (count)
info("%i untrusted character(s) replaced" , count);
dbg("rule applied, added symlink(s) '%s'", temp);
/* add multiple symlinks separated by spaces */
pos = temp;
while (isspace(pos[0]))
pos++;
next = strchr(pos, ' ');
while (next) {
next[0] = '\0';
info("add symlink '%s'", pos);
name_list_add(&udev->symlink_list, pos, 0);
while (isspace(next[1]))
next++;
pos = &next[1];
next = strchr(pos, ' ');
}
if (pos[0] != '\0') {
info("add symlink '%s'", pos);
name_list_add(&udev->symlink_list, pos, 0);
}
}
/* set name, later rules with name set will be ignored */
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));
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);
info("rule applied, '%s' becomes '%s'", udev->dev->kernel, udev->name);
if (strcmp(udev->dev->subsystem, "net") != 0)
dbg("name, '%s' is going to have owner='%s', group='%s', mode=%#o partitions=%i",
udev->name, udev->owner, udev->group, udev->mode, udev->partitions);
}
if (!udev->run_final && rule->run.operation != KEY_OP_UNSET) {
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);
}
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) {
dbg("last rule to be applied");
break;
}
if (rule->goto_label.operation != KEY_OP_UNSET) {
dbg("moving forward to label '%s'", key_val(rule, &rule->goto_label));
udev_rules_iter_label(rules, key_val(rule, &rule->goto_label));
}
}
}
if (!name_set) {
strlcpy(udev->name, udev->dev->kernel, sizeof(udev->name));
info("no node name set, will use kernel name '%s'", udev->name);
}
if (udev->tmp_node[0] != '\0') {
dbg("removing temporary device node");
unlink_secure(udev->tmp_node);
udev->tmp_node[0] = '\0';
}
return 0;
}
int udev_rules_get_run(struct udev_rules *rules, struct udevice *udev)
{
struct udev_rule *rule;
dbg("udev->kernel='%s'", udev->dev->kernel);
/* look for a matching rule to apply */
udev_rules_iter_init(rules);
while (1) {
rule = udev_rules_iter_next(rules);
if (rule == NULL)
break;
dbg("process rule");
if (rule->name.operation != KEY_OP_UNSET || rule->symlink.operation != KEY_OP_UNSET ||
rule->mode_operation != KEY_OP_UNSET || rule->owner.operation != KEY_OP_UNSET || rule->group.operation != KEY_OP_UNSET) {
dbg("skip rule that names a device");
continue;
}
if (match_rule(udev, rule) == 0) {
if (rule->ignore_device) {
info("rule applied, '%s' is ignored", udev->dev->kernel);
udev->ignore_device = 1;
return 0;
}
if (!udev->run_final && rule->run.operation != KEY_OP_UNSET) {
if (rule->run.operation == KEY_OP_ASSIGN || rule->run.operation == KEY_OP_ASSIGN_FINAL) {
info("reset run list");
name_list_cleanup(&udev->run_list);
}
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;
}
if (rule->last_rule) {
dbg("last rule to be applied");
break;
}
if (rule->goto_label.operation != KEY_OP_UNSET) {
dbg("moving forward to label '%s'", key_val(rule, &rule->goto_label));
udev_rules_iter_label(rules, key_val(rule, &rule->goto_label));
}
}
}
return 0;
}
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