mirror of
https://github.com/AuxXxilium/eudev.git
synced 2024-12-15 19:16:08 +07:00
40caaeec51
Signed-off-by: Kay Sievers <kay.sievers@suse.de>
671 lines
15 KiB
C
671 lines
15 KiB
C
/*
|
|
* udev_rules_parse.c
|
|
*
|
|
* Copyright (C) 2003,2004 Greg Kroah-Hartman <greg@kroah.com>
|
|
* Copyright (C) 2003-2005 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 <ctype.h>
|
|
#include <unistd.h>
|
|
#include <sys/stat.h>
|
|
#include <errno.h>
|
|
|
|
#include "udev_libc_wrapper.h"
|
|
#include "udev.h"
|
|
#include "udev_utils.h"
|
|
#include "logging.h"
|
|
#include "udev_rules.h"
|
|
|
|
|
|
void udev_rules_iter_init(struct udev_rules *rules)
|
|
{
|
|
dbg("bufsize=%zi", rules->bufsize);
|
|
rules->current = 0;
|
|
}
|
|
|
|
struct udev_rule *udev_rules_iter_next(struct udev_rules *rules)
|
|
{
|
|
static struct udev_rule *rule;
|
|
|
|
if (!rules)
|
|
return NULL;
|
|
|
|
dbg("current=%zi", rules->current);
|
|
if (rules->current >= rules->bufsize) {
|
|
dbg("no more rules");
|
|
return NULL;
|
|
}
|
|
|
|
/* get next rule */
|
|
rule = (struct udev_rule *) (rules->buf + rules->current);
|
|
rules->current += sizeof(struct udev_rule) + rule->bufsize;
|
|
|
|
return rule;
|
|
}
|
|
|
|
struct udev_rule *udev_rules_iter_label(struct udev_rules *rules, const char *label)
|
|
{
|
|
static struct udev_rule *rule;
|
|
|
|
next:
|
|
dbg("current=%zi", rules->current);
|
|
if (rules->current >= rules->bufsize) {
|
|
dbg("no more rules");
|
|
return NULL;
|
|
}
|
|
rule = (struct udev_rule *) (rules->buf + rules->current);
|
|
|
|
if (strcmp(&rule->buf[rule->label.val_off], label) != 0) {
|
|
dbg("moving forward, looking for label '%s'", label);
|
|
rules->current += sizeof(struct udev_rule) + rule->bufsize;
|
|
goto next;
|
|
}
|
|
|
|
dbg("found label '%s'", label);
|
|
return rule;
|
|
}
|
|
|
|
static int get_key(char **line, char **key, enum key_operation *operation, char **value)
|
|
{
|
|
char *linepos;
|
|
char *temp;
|
|
|
|
linepos = *line;
|
|
if (linepos == NULL && linepos[0] == '\0')
|
|
return -1;
|
|
|
|
/* skip whitespace */
|
|
while (isspace(linepos[0]) || linepos[0] == ',')
|
|
linepos++;
|
|
|
|
/* get the key */
|
|
if (linepos[0] == '\0')
|
|
return -1;
|
|
*key = linepos;
|
|
|
|
while (1) {
|
|
linepos++;
|
|
if (linepos[0] == '\0')
|
|
return -1;
|
|
if (isspace(linepos[0]))
|
|
break;
|
|
if (linepos[0] == '=')
|
|
break;
|
|
if (linepos[0] == '+')
|
|
break;
|
|
if (linepos[0] == '!')
|
|
break;
|
|
if (linepos[0] == ':')
|
|
break;
|
|
}
|
|
|
|
/* remember end of key */
|
|
temp = linepos;
|
|
|
|
/* skip whitespace after key */
|
|
while (isspace(linepos[0]))
|
|
linepos++;
|
|
if (linepos[0] == '\0')
|
|
return -1;
|
|
|
|
/* get operation type */
|
|
if (linepos[0] == '=' && linepos[1] == '=') {
|
|
*operation = KEY_OP_MATCH;
|
|
linepos += 2;
|
|
dbg("operator=match");
|
|
} else if (linepos[0] == '!' && linepos[1] == '=') {
|
|
*operation = KEY_OP_NOMATCH;
|
|
linepos += 2;
|
|
dbg("operator=nomatch");
|
|
} else if (linepos[0] == '+' && linepos[1] == '=') {
|
|
*operation = KEY_OP_ADD;
|
|
linepos += 2;
|
|
dbg("operator=add");
|
|
} else if (linepos[0] == '=') {
|
|
*operation = KEY_OP_ASSIGN;
|
|
linepos++;
|
|
dbg("operator=assign");
|
|
} else if (linepos[0] == ':' && linepos[1] == '=') {
|
|
*operation = KEY_OP_ASSIGN_FINAL;
|
|
linepos += 2;
|
|
dbg("operator=assign_final");
|
|
} else
|
|
return -1;
|
|
|
|
/* terminate key */
|
|
temp[0] = '\0';
|
|
dbg("key='%s'", *key);
|
|
|
|
/* skip whitespace after operator */
|
|
while (isspace(linepos[0]))
|
|
linepos++;
|
|
if (linepos[0] == '\0')
|
|
return -1;
|
|
|
|
/* get the value*/
|
|
if (linepos[0] == '"')
|
|
linepos++;
|
|
else
|
|
return -1;
|
|
*value = linepos;
|
|
|
|
temp = strchr(linepos, '"');
|
|
if (!temp)
|
|
return -1;
|
|
temp[0] = '\0';
|
|
temp++;
|
|
dbg("value='%s'", *value);
|
|
|
|
/* move line to next key */
|
|
*line = temp;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* extract possible KEY{attr} */
|
|
static char *get_key_attribute(char *str)
|
|
{
|
|
char *pos;
|
|
char *attr;
|
|
|
|
attr = strchr(str, '{');
|
|
if (attr != NULL) {
|
|
attr++;
|
|
pos = strchr(attr, '}');
|
|
if (pos == NULL) {
|
|
err("missing closing brace for format");
|
|
return NULL;
|
|
}
|
|
pos[0] = '\0';
|
|
dbg("attribute='%s'", attr);
|
|
return attr;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int add_rule_key(struct udev_rule *rule, struct key *key,
|
|
enum key_operation operation, const char *value)
|
|
{
|
|
size_t val_len = strnlen(value, PATH_SIZE);
|
|
|
|
key->operation = operation;
|
|
|
|
key->val_off = rule->bufsize;
|
|
strlcpy(rule->buf + rule->bufsize, value, val_len+1);
|
|
rule->bufsize += val_len+1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int add_rule_key_pair(struct udev_rule *rule, struct key_pairs *pairs,
|
|
enum key_operation operation, const char *key, const char *value)
|
|
{
|
|
size_t key_len = strnlen(key, PATH_SIZE);
|
|
|
|
if (pairs->count >= PAIRS_MAX) {
|
|
err("skip, too many keys in a single rule");
|
|
return -1;
|
|
}
|
|
|
|
add_rule_key(rule, &pairs->keys[pairs->count].key, operation, value);
|
|
|
|
/* add the key-name of the pair */
|
|
pairs->keys[pairs->count].key_name_off = rule->bufsize;
|
|
strlcpy(rule->buf + rule->bufsize, key, key_len+1);
|
|
rule->bufsize += key_len+1;
|
|
|
|
pairs->count++;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int add_to_rules(struct udev_rules *rules, char *line)
|
|
{
|
|
struct udev_rule *rule;
|
|
size_t rule_size;
|
|
int valid;
|
|
char *linepos;
|
|
char *attr;
|
|
size_t padding;
|
|
int retval;
|
|
|
|
/* get all the keys */
|
|
rule = calloc(1, sizeof (struct udev_rule) + LINE_SIZE);
|
|
if (!rule) {
|
|
err("malloc failed");
|
|
return -1;
|
|
}
|
|
linepos = line;
|
|
valid = 0;
|
|
|
|
while (1) {
|
|
char *key;
|
|
char *value;
|
|
enum key_operation operation = KEY_OP_UNSET;
|
|
|
|
retval = get_key(&linepos, &key, &operation, &value);
|
|
if (retval)
|
|
break;
|
|
|
|
if (strcasecmp(key, "LABEL") == 0) {
|
|
add_rule_key(rule, &rule->label, operation, value);
|
|
valid = 1;
|
|
continue;
|
|
}
|
|
|
|
if (strcasecmp(key, "GOTO") == 0) {
|
|
add_rule_key(rule, &rule->goto_label, operation, value);
|
|
valid = 1;
|
|
continue;
|
|
}
|
|
|
|
if (strcasecmp(key, "KERNEL") == 0) {
|
|
add_rule_key(rule, &rule->kernel_name, operation, value);
|
|
valid = 1;
|
|
continue;
|
|
}
|
|
|
|
if (strcasecmp(key, "SUBSYSTEM") == 0) {
|
|
add_rule_key(rule, &rule->subsystem, operation, value);
|
|
valid = 1;
|
|
continue;
|
|
}
|
|
|
|
if (strcasecmp(key, "ACTION") == 0) {
|
|
add_rule_key(rule, &rule->action, operation, value);
|
|
valid = 1;
|
|
continue;
|
|
}
|
|
|
|
if (strcasecmp(key, "DEVPATH") == 0) {
|
|
add_rule_key(rule, &rule->devpath, operation, value);
|
|
valid = 1;
|
|
continue;
|
|
}
|
|
|
|
if (strcasecmp(key, "BUS") == 0) {
|
|
add_rule_key(rule, &rule->bus, operation, value);
|
|
valid = 1;
|
|
continue;
|
|
}
|
|
|
|
if (strcasecmp(key, "ID") == 0) {
|
|
add_rule_key(rule, &rule->id, operation, value);
|
|
valid = 1;
|
|
continue;
|
|
}
|
|
|
|
if (strncasecmp(key, "SYSFS", sizeof("SYSFS")-1) == 0) {
|
|
attr = get_key_attribute(key + sizeof("SYSFS")-1);
|
|
if (attr == NULL) {
|
|
err("error parsing SYSFS attribute in '%s'", line);
|
|
continue;
|
|
}
|
|
add_rule_key_pair(rule, &rule->sysfs, operation, attr, value);
|
|
valid = 1;
|
|
continue;
|
|
}
|
|
|
|
if (strcasecmp(key, "WAIT_FOR_SYSFS") == 0) {
|
|
add_rule_key(rule, &rule->wait_for_sysfs, operation, value);
|
|
valid = 1;
|
|
continue;
|
|
}
|
|
|
|
if (strncasecmp(key, "ENV", sizeof("ENV")-1) == 0) {
|
|
attr = get_key_attribute(key + sizeof("ENV")-1);
|
|
if (attr == NULL) {
|
|
err("error parsing ENV attribute");
|
|
continue;
|
|
}
|
|
add_rule_key_pair(rule, &rule->env, operation, attr, value);
|
|
valid = 1;
|
|
continue;
|
|
}
|
|
|
|
if (strcasecmp(key, "MODALIAS") == 0) {
|
|
add_rule_key(rule, &rule->modalias, operation, value);
|
|
valid = 1;
|
|
continue;
|
|
}
|
|
|
|
if (strncasecmp(key, "IMPORT", sizeof("IMPORT")-1) == 0) {
|
|
attr = get_key_attribute(key + sizeof("IMPORT")-1);
|
|
if (attr && strstr(attr, "program")) {
|
|
dbg("IMPORT will be executed");
|
|
rule->import_type = IMPORT_PROGRAM;
|
|
} else if (attr && strstr(attr, "file")) {
|
|
dbg("IMPORT will be included as file");
|
|
rule->import_type = IMPORT_FILE;
|
|
} else if (attr && strstr(attr, "parent")) {
|
|
dbg("IMPORT will include the parent values");
|
|
rule->import_type = IMPORT_PARENT;
|
|
} else {
|
|
/* figure it out if it is executable */
|
|
char file[PATH_SIZE];
|
|
char *pos;
|
|
struct stat stats;
|
|
|
|
strlcpy(file, value, sizeof(file));
|
|
pos = strchr(file, ' ');
|
|
if (pos)
|
|
pos[0] = '\0';
|
|
dbg("IMPORT auto mode for '%s'", file);
|
|
if (!lstat(file, &stats) && (stats.st_mode & S_IXUSR)) {
|
|
dbg("IMPORT is executable, will be executed (autotype)");
|
|
rule->import_type = IMPORT_PROGRAM;
|
|
} else {
|
|
dbg("IMPORT is not executable, will be included as file (autotype)");
|
|
rule->import_type = IMPORT_FILE;
|
|
}
|
|
}
|
|
add_rule_key(rule, &rule->import, operation, value);
|
|
valid = 1;
|
|
continue;
|
|
}
|
|
|
|
if (strcasecmp(key, "DRIVER") == 0) {
|
|
add_rule_key(rule, &rule->driver, operation, value);
|
|
valid = 1;
|
|
continue;
|
|
}
|
|
|
|
if (strcasecmp(key, "RESULT") == 0) {
|
|
add_rule_key(rule, &rule->result, operation, value);
|
|
valid = 1;
|
|
continue;
|
|
}
|
|
|
|
if (strcasecmp(key, "PROGRAM") == 0) {
|
|
add_rule_key(rule, &rule->program, operation, value);
|
|
valid = 1;
|
|
continue;
|
|
}
|
|
|
|
if (strncasecmp(key, "NAME", sizeof("NAME")-1) == 0) {
|
|
attr = get_key_attribute(key + sizeof("NAME")-1);
|
|
if (attr != NULL) {
|
|
if (strstr(attr, "all_partitions") != NULL) {
|
|
dbg("creation of partition nodes requested");
|
|
rule->partitions = DEFAULT_PARTITIONS_COUNT;
|
|
}
|
|
if (strstr(attr, "ignore_remove") != NULL) {
|
|
dbg("remove event should be ignored");
|
|
rule->ignore_remove = 1;
|
|
}
|
|
}
|
|
if (value[0] == '\0') {
|
|
dbg("name empty device should be ignored");
|
|
rule->name.operation = operation;
|
|
rule->ignore_device = 1;
|
|
} else
|
|
add_rule_key(rule, &rule->name, operation, value);
|
|
continue;
|
|
}
|
|
|
|
if (strcasecmp(key, "SYMLINK") == 0) {
|
|
add_rule_key(rule, &rule->symlink, operation, value);
|
|
valid = 1;
|
|
continue;
|
|
}
|
|
|
|
if (strcasecmp(key, "OWNER") == 0) {
|
|
valid = 1;
|
|
if (rules->resolve_names && (!strchr(value, '$') && !strchr(value, '%'))) {
|
|
char *endptr;
|
|
strtoul(value, &endptr, 10);
|
|
if (endptr[0] != '\0') {
|
|
char owner[32];
|
|
uid_t uid = lookup_user(value);
|
|
dbg("replacing username='%s' by id=%i", value, uid);
|
|
sprintf(owner, "%li", uid);
|
|
add_rule_key(rule, &rule->owner, operation, owner);
|
|
continue;
|
|
}
|
|
}
|
|
|
|
add_rule_key(rule, &rule->owner, operation, value);
|
|
continue;
|
|
}
|
|
|
|
if (strcasecmp(key, "GROUP") == 0) {
|
|
valid = 1;
|
|
if (rules->resolve_names && (!strchr(value, '$') && !strchr(value, '%'))) {
|
|
char *endptr;
|
|
strtoul(value, &endptr, 10);
|
|
if (endptr[0] != '\0') {
|
|
char group[32];
|
|
gid_t gid = lookup_group(value);
|
|
dbg("replacing groupname='%s' by id=%i", value, gid);
|
|
sprintf(group, "%li", gid);
|
|
add_rule_key(rule, &rule->group, operation, group);
|
|
continue;
|
|
}
|
|
}
|
|
|
|
add_rule_key(rule, &rule->group, operation, value);
|
|
continue;
|
|
}
|
|
|
|
if (strcasecmp(key, "MODE") == 0) {
|
|
rule->mode = strtol(value, NULL, 8);
|
|
rule->mode_operation = operation;
|
|
valid = 1;
|
|
continue;
|
|
}
|
|
|
|
if (strcasecmp(key, "RUN") == 0) {
|
|
add_rule_key(rule, &rule->run, operation, value);
|
|
valid = 1;
|
|
continue;
|
|
}
|
|
|
|
if (strcasecmp(key, "OPTIONS") == 0) {
|
|
if (strstr(value, "last_rule") != NULL) {
|
|
dbg("last rule to be applied");
|
|
rule->last_rule = 1;
|
|
}
|
|
if (strstr(value, "ignore_device") != NULL) {
|
|
dbg("device should be ignored");
|
|
rule->ignore_device = 1;
|
|
}
|
|
if (strstr(value, "ignore_remove") != NULL) {
|
|
dbg("remove event should be ignored");
|
|
rule->ignore_remove = 1;
|
|
}
|
|
if (strstr(value, "all_partitions") != NULL) {
|
|
dbg("creation of partition nodes requested");
|
|
rule->partitions = DEFAULT_PARTITIONS_COUNT;
|
|
}
|
|
valid = 1;
|
|
continue;
|
|
}
|
|
|
|
err("unknown key '%s', in '%s'", key, line);
|
|
}
|
|
|
|
/* skip line if not any valid key was found */
|
|
if (!valid) {
|
|
err("invalid rule '%s'", line);
|
|
goto exit;
|
|
}
|
|
|
|
/* grow buffer and add rule */
|
|
rule_size = sizeof(struct udev_rule) + rule->bufsize;
|
|
padding = (sizeof(size_t) - rule_size % sizeof(size_t)) % sizeof(size_t);
|
|
dbg("add %zi padding bytes", padding);
|
|
rule_size += padding;
|
|
rule->bufsize += padding;
|
|
|
|
rules->buf = realloc(rules->buf, rules->bufsize + rule_size);
|
|
if (!rules->buf) {
|
|
err("realloc failed");
|
|
goto exit;
|
|
}
|
|
dbg("adding rule to offset %zi", rules->bufsize);
|
|
memcpy(rules->buf + rules->bufsize, rule, rule_size);
|
|
rules->bufsize += rule_size;
|
|
exit:
|
|
free(rule);
|
|
return 0;
|
|
}
|
|
|
|
static int parse_file(struct udev_rules *rules, const char *filename)
|
|
{
|
|
char line[LINE_SIZE];
|
|
char *bufline;
|
|
int lineno;
|
|
char *buf;
|
|
size_t bufsize;
|
|
size_t cur;
|
|
size_t count;
|
|
int retval = 0;
|
|
|
|
if (file_map(filename, &buf, &bufsize) != 0) {
|
|
err("can't open '%s' as rules file", filename);
|
|
return -1;
|
|
}
|
|
dbg("reading '%s' as rules file", filename);
|
|
|
|
/* loop through the whole file */
|
|
cur = 0;
|
|
lineno = 0;
|
|
while (cur < bufsize) {
|
|
unsigned int i, j;
|
|
|
|
count = buf_get_line(buf, bufsize, cur);
|
|
bufline = &buf[cur];
|
|
cur += count+1;
|
|
lineno++;
|
|
|
|
if (count >= sizeof(line)) {
|
|
info("line too long, rule skipped %s, line %d", 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;
|
|
|
|
/* skip backslash and newline from multi line rules */
|
|
for (i = j = 0; i < count; i++) {
|
|
if (bufline[i] == '\\' && bufline[i+1] == '\n')
|
|
continue;
|
|
|
|
line[j++] = bufline[i];
|
|
}
|
|
line[j] = '\0';
|
|
|
|
dbg("read '%s'", line);
|
|
add_to_rules(rules, line);
|
|
}
|
|
|
|
file_unmap(buf, bufsize);
|
|
return retval;
|
|
}
|
|
|
|
static int rules_map(struct udev_rules *rules, const char *filename)
|
|
{
|
|
if (file_map(filename, &rules->buf, &rules->bufsize)) {
|
|
rules->buf = NULL;
|
|
return -1;
|
|
}
|
|
if (rules->bufsize == 0) {
|
|
file_unmap(rules->buf, rules->bufsize);
|
|
rules->buf = NULL;
|
|
return -1;
|
|
}
|
|
rules->mapped = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int udev_rules_init(struct udev_rules *rules, int read_compiled, int resolve_names)
|
|
{
|
|
char comp[PATH_SIZE];
|
|
struct stat stats;
|
|
int retval;
|
|
|
|
memset(rules, 0x00, sizeof(struct udev_rules));
|
|
rules->resolve_names = resolve_names;
|
|
|
|
/* check for precompiled rules */
|
|
if (read_compiled) {
|
|
strlcpy(comp, udev_rules_filename, sizeof(comp));
|
|
strlcat(comp, ".compiled", sizeof(comp));
|
|
if (stat(comp, &stats) == 0) {
|
|
dbg("map compiled rules '%s'", comp);
|
|
if (rules_map(rules, comp) == 0)
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* parse rules file or all matching files in directory */
|
|
if (stat(udev_rules_filename, &stats) != 0)
|
|
return -1;
|
|
|
|
if ((stats.st_mode & S_IFMT) != S_IFDIR) {
|
|
dbg("parse single rules file '%s'", udev_rules_filename);
|
|
retval = parse_file(rules, udev_rules_filename);
|
|
} else {
|
|
struct name_entry *name_loop, *name_tmp;
|
|
LIST_HEAD(name_list);
|
|
|
|
dbg("parse rules directory '%s'", udev_rules_filename);
|
|
retval = add_matching_files(&name_list, udev_rules_filename, RULEFILE_SUFFIX);
|
|
|
|
list_for_each_entry_safe(name_loop, name_tmp, &name_list, node) {
|
|
if (stat(name_loop->name, &stats) == 0) {
|
|
if (stats.st_size)
|
|
parse_file(rules, name_loop->name);
|
|
else
|
|
dbg("empty rules file '%s'", name_loop->name);
|
|
} else
|
|
dbg("could not read '%s'", name_loop->name);
|
|
list_del(&name_loop->node);
|
|
free(name_loop);
|
|
}
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
void udev_rules_close(struct udev_rules *rules)
|
|
{
|
|
if (rules->buf) {
|
|
if (rules->mapped) {
|
|
rules->mapped = 0;
|
|
file_unmap(rules->buf, rules->bufsize);
|
|
} else
|
|
free(rules->buf);
|
|
rules->buf = NULL;
|
|
}
|
|
}
|