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systemd/src/udev/udev-rules.c

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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include <ctype.h>
#include "alloc-util.h"
#include "architecture.h"
#include "conf-files.h"
#include "conf-parser.h"
#include "confidential-virt.h"
#include "constants.h"
#include "device-private.h"
#include "device-util.h"
#include "dirent-util.h"
#include "escape.h"
#include "fd-util.h"
#include "fileio.h"
#include "format-util.h"
#include "fs-util.h"
#include "glob-util.h"
#include "list.h"
#include "mkdir.h"
#include "netif-naming-scheme.h"
#include "nulstr-util.h"
#include "parse-util.h"
#include "path-util.h"
#include "proc-cmdline.h"
#include "socket-util.h"
#include "stat-util.h"
#include "string-table.h"
#include "strv.h"
#include "strxcpyx.h"
#include "sysctl-util.h"
#include "syslog-util.h"
#include "udev-builtin.h"
#include "udev-event.h"
#include "udev-format.h"
#include "udev-node.h"
#include "udev-rules.h"
#include "udev-spawn.h"
#include "udev-trace.h"
#include "udev-util.h"
#include "user-util.h"
#include "virt.h"
#define RULES_DIRS ((const char* const*) CONF_PATHS_STRV("udev/rules.d"))
typedef enum {
OP_MATCH, /* == */
OP_NOMATCH, /* != */
OP_ADD, /* += */
OP_REMOVE, /* -= */
OP_ASSIGN, /* = */
OP_ASSIGN_FINAL, /* := */
_OP_TYPE_MAX,
_OP_TYPE_INVALID = -EINVAL,
} UdevRuleOperatorType;
typedef enum {
MATCH_TYPE_EMPTY, /* empty string */
MATCH_TYPE_PLAIN, /* no special characters */
MATCH_TYPE_PLAIN_WITH_EMPTY, /* no special characters with empty string, e.g., "|foo" */
MATCH_TYPE_GLOB, /* shell globs ?,*,[] */
MATCH_TYPE_GLOB_WITH_EMPTY, /* shell globs ?,*,[] with empty string, e.g., "|foo*" */
MATCH_TYPE_SUBSYSTEM, /* "subsystem", "bus", or "class" */
_MATCH_TYPE_MAX,
_MATCH_TYPE_INVALID = -EINVAL,
} UdevRuleMatchType;
typedef enum {
SUBST_TYPE_PLAIN, /* no substitution */
SUBST_TYPE_FORMAT, /* % or $ */
SUBST_TYPE_SUBSYS, /* "[<SUBSYSTEM>/<KERNEL>]<attribute>" format */
_SUBST_TYPE_MAX,
_SUBST_TYPE_INVALID = -EINVAL,
} UdevRuleSubstituteType;
typedef enum {
/* lvalues which take match or nomatch operator */
TK_M_ACTION, /* string, device_get_action() */
TK_M_DEVPATH, /* path, sd_device_get_devpath() */
TK_M_KERNEL, /* string, sd_device_get_sysname() */
TK_M_DEVLINK, /* strv, sd_device_get_devlink_first(), sd_device_get_devlink_next() */
TK_M_NAME, /* string, name of network interface */
TK_M_ENV, /* string, device property, takes key through attribute */
TK_M_CONST, /* string, system-specific hard-coded constant */
TK_M_TAG, /* strv, sd_device_get_tag_first(), sd_device_get_tag_next() */
TK_M_SUBSYSTEM, /* string, sd_device_get_subsystem() */
TK_M_DRIVER, /* string, sd_device_get_driver() */
TK_M_ATTR, /* string, takes filename through attribute, sd_device_get_sysattr_value(), udev_resolve_subsys_kernel(), etc. */
TK_M_SYSCTL, /* string, takes kernel parameter through attribute */
/* matches parent parameters */
TK_M_PARENTS_KERNEL, /* string */
TK_M_PARENTS_SUBSYSTEM, /* string */
TK_M_PARENTS_DRIVER, /* string */
TK_M_PARENTS_ATTR, /* string */
TK_M_PARENTS_TAG, /* strv */
TK_M_TEST, /* path, optionally mode_t can be specified by attribute, test the existence of a file */
TK_M_PROGRAM, /* string, execute a program */
TK_M_IMPORT_FILE, /* path */
TK_M_IMPORT_PROGRAM, /* string, import properties from the result of program */
TK_M_IMPORT_BUILTIN, /* string, import properties from the result of built-in command */
TK_M_IMPORT_DB, /* string, import properties from database */
TK_M_IMPORT_CMDLINE, /* string, kernel command line */
TK_M_IMPORT_PARENT, /* string, parent property */
TK_M_RESULT, /* string, result of TK_M_PROGRAM */
#define _TK_M_MAX (TK_M_RESULT + 1)
#define _TK_A_MIN _TK_M_MAX
/* lvalues which take one of assign operators */
TK_A_OPTIONS_STRING_ESCAPE_NONE, /* no argument */
TK_A_OPTIONS_STRING_ESCAPE_REPLACE, /* no argument */
TK_A_OPTIONS_DB_PERSIST, /* no argument */
TK_A_OPTIONS_INOTIFY_WATCH, /* boolean */
TK_A_OPTIONS_DEVLINK_PRIORITY, /* int */
TK_A_OPTIONS_LOG_LEVEL, /* string of log level or "reset" */
TK_A_OWNER, /* user name */
TK_A_GROUP, /* group name */
TK_A_MODE, /* mode string */
TK_A_OWNER_ID, /* uid_t */
TK_A_GROUP_ID, /* gid_t */
TK_A_MODE_ID, /* mode_t */
TK_A_TAG, /* string */
TK_A_OPTIONS_STATIC_NODE, /* device path, /dev/... */
TK_A_SECLABEL, /* string with attribute */
TK_A_ENV, /* string with attribute */
TK_A_NAME, /* ifname */
TK_A_DEVLINK, /* string */
TK_A_ATTR, /* string with attribute */
TK_A_SYSCTL, /* string with attribute */
TK_A_RUN_BUILTIN, /* string */
TK_A_RUN_PROGRAM, /* string */
_TK_TYPE_MAX,
_TK_TYPE_INVALID = -EINVAL,
} UdevRuleTokenType;
typedef enum {
LINE_HAS_NAME = 1 << 0, /* has NAME= */
LINE_HAS_DEVLINK = 1 << 1, /* has SYMLINK=, OWNER=, GROUP= or MODE= */
LINE_HAS_STATIC_NODE = 1 << 2, /* has OPTIONS=static_node */
LINE_HAS_GOTO = 1 << 3, /* has GOTO= */
LINE_HAS_LABEL = 1 << 4, /* has LABEL= */
LINE_UPDATE_SOMETHING = 1 << 5, /* has other TK_A_* or TK_M_IMPORT tokens */
LINE_IS_REFERENCED = 1 << 6, /* is referenced by GOTO */
} UdevRuleLineType;
typedef struct UdevRuleFile UdevRuleFile;
typedef struct UdevRuleLine UdevRuleLine;
typedef struct UdevRuleToken UdevRuleToken;
struct UdevRuleToken {
UdevRuleTokenType type:8;
UdevRuleOperatorType op:8;
UdevRuleMatchType match_type:8;
UdevRuleSubstituteType attr_subst_type:7;
bool attr_match_remove_trailing_whitespace:1;
const char *value;
void *data;
UdevRuleLine *rule_line;
LIST_FIELDS(UdevRuleToken, tokens);
};
struct UdevRuleLine {
char *line;
unsigned line_number;
UdevRuleLineType type;
const char *label;
const char *goto_label;
UdevRuleLine *goto_line;
UdevRuleFile *rule_file;
LIST_HEAD(UdevRuleToken, tokens);
LIST_FIELDS(UdevRuleLine, rule_lines);
};
struct UdevRuleFile {
char *filename;
unsigned issues; /* used by "udevadm verify" */
UdevRules *rules;
LIST_HEAD(UdevRuleLine, rule_lines);
LIST_FIELDS(UdevRuleFile, rule_files);
};
struct UdevRules {
ResolveNameTiming resolve_name_timing;
Hashmap *known_users;
Hashmap *known_groups;
Hashmap *stats_by_path;
LIST_HEAD(UdevRuleFile, rule_files);
};
#define LINE_GET_RULES(line) \
ASSERT_PTR(ASSERT_PTR(ASSERT_PTR(line)->rule_file)->rules)
/*** Logging helpers ***/
#define log_udev_rule_internal(device, file, line_nr, level, error, fmt, ...) \
({ \
int _lv = (level); \
sd_device *_dev = (device); \
UdevRuleFile *_f = (file); \
const char *_n = _f ? _f->filename : NULL; \
\
if (!_dev && _f) \
_f->issues |= (1U << _lv); \
\
log_device_full_errno_zerook( \
_dev, _lv, error, "%s:%u " fmt, \
strna(_n), line_nr, \
##__VA_ARGS__); \
})
/* Mainly used when applying tokens to the event device. */
#define log_event_full_errno_zerook(device, token, ...) \
({ \
UdevRuleToken *_t = (token); \
UdevRuleLine *_l = _t ? _t->rule_line : NULL; \
\
log_udev_rule_internal( \
device, \
_l ? _l->rule_file : NULL, \
_l ? _l->line_number : 0, \
__VA_ARGS__); \
})
#define log_event_full_errno(device, token, level, error, ...) \
({ \
int _error = (error); \
ASSERT_NON_ZERO(_error); \
log_event_full_errno_zerook( \
device, token, level, _error, ##__VA_ARGS__); \
})
#define log_event_full(device, token, level, ...) (void) log_event_full_errno_zerook(device, token, level, 0, __VA_ARGS__)
#define log_event_debug(device, token, ...) log_event_full(device, token, LOG_DEBUG, __VA_ARGS__)
#define log_event_info(device, token, ...) log_event_full(device, token, LOG_INFO, __VA_ARGS__)
#define log_event_notice(device, token, ...) log_event_full(device, token, LOG_NOTICE, __VA_ARGS__)
#define log_event_warning(device, token, ...) log_event_full(device, token, LOG_WARNING, __VA_ARGS__)
#define log_event_error(device, token, ...) log_event_full(device, token, LOG_ERR, __VA_ARGS__)
#define log_event_debug_errno(device, token, error, ...) log_event_full_errno(device, token, LOG_DEBUG, error, __VA_ARGS__)
#define log_event_info_errno(device, token, error, ...) log_event_full_errno(device, token, LOG_INFO, error, __VA_ARGS__)
#define log_event_notice_errno(device, token, error, ...) log_event_full_errno(device, token, LOG_NOTICE, error, __VA_ARGS__)
#define log_event_warning_errno(device, token, error, ...) log_event_full_errno(device, token, LOG_WARNING, error, __VA_ARGS__)
#define log_event_error_errno(device, token, error, ...) log_event_full_errno(device, token, LOG_ERR, error, __VA_ARGS__)
/* Mainly used when parsing .rules files. */
#define log_file_full_errno_zerook(...) \
log_udev_rule_internal(NULL, __VA_ARGS__)
#define log_file_error(file, line_nr, ...) \
log_file_full_errno_zerook(file, line_nr, LOG_ERR, 0, __VA_ARGS__)
#define log_line_full_errno_zerook(line, ...) \
({ \
UdevRuleLine *_l = (line); \
log_file_full_errno_zerook( \
_l ? _l->rule_file : NULL, \
_l ? _l->line_number : 0, \
__VA_ARGS__); \
})
#define log_line_full_errno(line, level, error, ...) \
({ \
int _error = (error); \
ASSERT_NON_ZERO(_error); \
log_line_full_errno_zerook( \
line, level, _error, ##__VA_ARGS__); \
})
#define log_line_full(line, level, ...) (void) log_line_full_errno_zerook(line, level, 0, __VA_ARGS__)
#define log_line_debug(line, ...) log_line_full(line, LOG_DEBUG, __VA_ARGS__)
#define log_line_info(line, ...) log_line_full(line, LOG_INFO, __VA_ARGS__)
#define log_line_notice(line, ...) log_line_full(line, LOG_NOTICE, __VA_ARGS__)
#define log_line_warning(line, ...) log_line_full(line, LOG_WARNING, __VA_ARGS__)
#define log_line_error(line, ...) log_line_full(line, LOG_ERR, __VA_ARGS__)
#define log_line_debug_errno(line, error, ...) log_line_full_errno(line, LOG_DEBUG, error, __VA_ARGS__)
#define log_line_info_errno(line, error, ...) log_line_full_errno(line, LOG_INFO, error, __VA_ARGS__)
#define log_line_notice_errno(line, error, ...) log_line_full_errno(line, LOG_NOTICE, error, __VA_ARGS__)
#define log_line_warning_errno(line, error, ...) log_line_full_errno(line, LOG_WARNING, error, __VA_ARGS__)
#define log_line_error_errno(line, error, ...) log_line_full_errno(line, LOG_ERR, error, __VA_ARGS__)
#define _log_line_invalid_token(line, key, type) \
log_line_error_errno(line, SYNTHETIC_ERRNO(EINVAL), \
"Invalid %s for %s.", type, key)
#define log_line_invalid_op(line, key) _log_line_invalid_token(line, key, "operator")
#define log_line_invalid_attr(line, key) _log_line_invalid_token(line, key, "attribute")
#define log_line_invalid_attr_format(line, key, attr, offset, hint) \
log_line_error_errno(line, SYNTHETIC_ERRNO(EINVAL), \
"Invalid attribute \"%s\" for %s (char %zu: %s), ignoring.", \
attr, key, offset, hint)
#define log_line_invalid_value(line, key, value, offset, hint) \
log_line_error_errno(line, SYNTHETIC_ERRNO(EINVAL), \
"Invalid value \"%s\" for %s (char %zu: %s), ignoring.", \
value, key, offset, hint)
static void log_unknown_owner(sd_device *dev, UdevRuleLine *line, int error, const char *entity, const char *name) {
assert(line);
ASSERT_NON_ZERO(error);
if (IN_SET(abs(error), ENOENT, ESRCH))
log_udev_rule_internal(dev, line->rule_file, line->line_number, LOG_ERR, error,
"Unknown %s '%s', ignoring.", entity, name);
else
log_udev_rule_internal(dev, line->rule_file, line->line_number, LOG_ERR, error,
"Failed to resolve %s '%s', ignoring: %m", entity, name);
}
static void log_event_truncated(
sd_device *dev,
UdevRuleToken *token,
const char *what,
const char *format,
const char *key,
bool is_match) {
if (is_match)
log_event_debug(dev, token,
"The %s is truncated while substituting into '%s', "
"assuming the %s key does not match.",
what, format, key);
else
log_event_warning(dev, token,
"The %s is truncated while substituting into '%s', "
"refusing to apply the %s key.",
what, format, key);
}
/*** Other functions ***/
static UdevRuleToken *udev_rule_token_free(UdevRuleToken *token) {
if (!token)
return NULL;
if (token->rule_line)
LIST_REMOVE(tokens, token->rule_line->tokens, token);
return mfree(token);
}
DEFINE_TRIVIAL_CLEANUP_FUNC(UdevRuleToken*, udev_rule_token_free);
static void udev_rule_line_clear_tokens(UdevRuleLine *rule_line) {
assert(rule_line);
LIST_FOREACH(tokens, i, rule_line->tokens)
udev_rule_token_free(i);
}
static UdevRuleLine *udev_rule_line_free(UdevRuleLine *rule_line) {
if (!rule_line)
return NULL;
udev_rule_line_clear_tokens(rule_line);
if (rule_line->rule_file)
LIST_REMOVE(rule_lines, rule_line->rule_file->rule_lines, rule_line);
free(rule_line->line);
return mfree(rule_line);
}
DEFINE_TRIVIAL_CLEANUP_FUNC(UdevRuleLine*, udev_rule_line_free);
static UdevRuleFile *udev_rule_file_free(UdevRuleFile *rule_file) {
if (!rule_file)
return NULL;
LIST_FOREACH(rule_lines, i, rule_file->rule_lines)
udev_rule_line_free(i);
if (rule_file->rules)
LIST_REMOVE(rule_files, rule_file->rules->rule_files, rule_file);
free(rule_file->filename);
return mfree(rule_file);
}
DEFINE_TRIVIAL_CLEANUP_FUNC(UdevRuleFile*, udev_rule_file_free);
UdevRules *udev_rules_free(UdevRules *rules) {
if (!rules)
return NULL;
LIST_FOREACH(rule_files, i, rules->rule_files)
udev_rule_file_free(i);
hashmap_free_free_key(rules->known_users);
hashmap_free_free_key(rules->known_groups);
hashmap_free(rules->stats_by_path);
return mfree(rules);
}
static int rule_resolve_user(UdevRuleLine *rule_line, const char *name, uid_t *ret) {
Hashmap **known_users = &LINE_GET_RULES(rule_line)->known_users;
_cleanup_free_ char *n = NULL;
uid_t uid;
void *val;
int r;
assert(name);
assert(ret);
val = hashmap_get(*known_users, name);
if (val) {
*ret = PTR_TO_UID(val);
return 0;
}
r = get_user_creds(&name, &uid, NULL, NULL, NULL, USER_CREDS_ALLOW_MISSING);
if (r < 0) {
log_unknown_owner(NULL, rule_line, r, "user", name);
*ret = UID_INVALID;
return 0;
}
n = strdup(name);
if (!n)
return -ENOMEM;
r = hashmap_ensure_put(known_users, &string_hash_ops, n, UID_TO_PTR(uid));
if (r < 0)
return r;
TAKE_PTR(n);
*ret = uid;
return 0;
}
static int rule_resolve_group(UdevRuleLine *rule_line, const char *name, gid_t *ret) {
Hashmap **known_groups = &LINE_GET_RULES(rule_line)->known_groups;
_cleanup_free_ char *n = NULL;
gid_t gid;
void *val;
int r;
assert(name);
assert(ret);
val = hashmap_get(*known_groups, name);
if (val) {
*ret = PTR_TO_GID(val);
return 0;
}
r = get_group_creds(&name, &gid, USER_CREDS_ALLOW_MISSING);
if (r < 0) {
log_unknown_owner(NULL, rule_line, r, "group", name);
*ret = GID_INVALID;
return 0;
}
n = strdup(name);
if (!n)
return -ENOMEM;
r = hashmap_ensure_put(known_groups, &string_hash_ops, n, GID_TO_PTR(gid));
if (r < 0)
return r;
TAKE_PTR(n);
*ret = gid;
return 0;
}
static UdevRuleSubstituteType rule_get_substitution_type(const char *str) {
assert(str);
if (str[0] == '[')
return SUBST_TYPE_SUBSYS;
if (strchr(str, '%') || strchr(str, '$'))
return SUBST_TYPE_FORMAT;
return SUBST_TYPE_PLAIN;
}
static bool type_has_nulstr_value(UdevRuleTokenType type) {
return type < TK_M_TEST || type == TK_M_RESULT;
}
static int rule_line_add_token(UdevRuleLine *rule_line, UdevRuleTokenType type, UdevRuleOperatorType op, char *value, void *data) {
_cleanup_(udev_rule_token_freep) UdevRuleToken *token = NULL;
UdevRuleMatchType match_type = _MATCH_TYPE_INVALID;
UdevRuleSubstituteType subst_type = _SUBST_TYPE_INVALID;
bool remove_trailing_whitespace = false;
size_t len;
assert(rule_line);
assert(type >= 0 && type < _TK_TYPE_MAX);
assert(op >= 0 && op < _OP_TYPE_MAX);
if (type < _TK_M_MAX) {
assert(value);
assert(IN_SET(op, OP_MATCH, OP_NOMATCH));
if (type == TK_M_SUBSYSTEM && STR_IN_SET(value, "subsystem", "bus", "class"))
match_type = MATCH_TYPE_SUBSYSTEM;
else if (isempty(value))
match_type = MATCH_TYPE_EMPTY;
else if (streq(value, "?*")) {
/* Convert KEY=="?*" -> KEY!="" */
match_type = MATCH_TYPE_EMPTY;
op = op == OP_MATCH ? OP_NOMATCH : OP_MATCH;
} else if (string_is_glob(value))
match_type = MATCH_TYPE_GLOB;
else
match_type = MATCH_TYPE_PLAIN;
if (type_has_nulstr_value(type)) {
/* Convert value string to nulstr. */
bool bar = true, empty = false;
char *a, *b;
for (a = b = value; *a != '\0'; a++) {
if (*a != '|') {
*b++ = *a;
bar = false;
} else {
if (bar)
empty = true;
else
*b++ = '\0';
bar = true;
}
}
*b = '\0';
/* Make sure the value is end, so NULSTR_FOREACH can read correct match */
if (b < a)
b[1] = '\0';
if (bar)
empty = true;
if (empty) {
if (match_type == MATCH_TYPE_GLOB)
match_type = MATCH_TYPE_GLOB_WITH_EMPTY;
if (match_type == MATCH_TYPE_PLAIN)
match_type = MATCH_TYPE_PLAIN_WITH_EMPTY;
}
}
}
if (IN_SET(type, TK_M_ATTR, TK_M_PARENTS_ATTR)) {
assert(value);
assert(data);
len = strlen(value);
if (len > 0 && !isspace(value[len - 1]))
remove_trailing_whitespace = true;
subst_type = rule_get_substitution_type(data);
}
token = new(UdevRuleToken, 1);
if (!token)
return -ENOMEM;
*token = (UdevRuleToken) {
.type = type,
.op = op,
.value = value,
.data = data,
.match_type = match_type,
.attr_subst_type = subst_type,
.attr_match_remove_trailing_whitespace = remove_trailing_whitespace,
.rule_line = rule_line,
};
LIST_APPEND(tokens, rule_line->tokens, token);
if (token->type == TK_A_NAME)
SET_FLAG(rule_line->type, LINE_HAS_NAME, true);
else if (IN_SET(token->type, TK_A_DEVLINK,
TK_A_OWNER, TK_A_GROUP, TK_A_MODE,
TK_A_OWNER_ID, TK_A_GROUP_ID, TK_A_MODE_ID))
SET_FLAG(rule_line->type, LINE_HAS_DEVLINK, true);
else if (token->type == TK_A_OPTIONS_STATIC_NODE)
SET_FLAG(rule_line->type, LINE_HAS_STATIC_NODE, true);
else if (token->type >= _TK_A_MIN ||
IN_SET(token->type, TK_M_PROGRAM,
TK_M_IMPORT_FILE, TK_M_IMPORT_PROGRAM, TK_M_IMPORT_BUILTIN,
TK_M_IMPORT_DB, TK_M_IMPORT_CMDLINE, TK_M_IMPORT_PARENT))
SET_FLAG(rule_line->type, LINE_UPDATE_SOMETHING, true);
TAKE_PTR(token);
return 0;
}
static void check_value_format_and_warn(UdevRuleLine *line, const char *key, const char *value, bool nonempty) {
size_t offset;
const char *hint;
if (nonempty && isempty(value))
log_line_invalid_value(line, key, value, (size_t) 0, "empty value");
else if (udev_check_format(value, &offset, &hint) < 0)
log_line_invalid_value(line, key, value, offset + 1, hint);
}
static int check_attr_format_and_warn(UdevRuleLine *line, const char *key, const char *value) {
size_t offset;
const char *hint;
if (isempty(value))
return log_line_invalid_attr(line, key);
if (udev_check_format(value, &offset, &hint) < 0)
log_line_invalid_attr_format(line, key, value, offset + 1, hint);
return 0;
}
static int parse_token(UdevRuleLine *rule_line, const char *key, char *attr, UdevRuleOperatorType op, char *value) {
ResolveNameTiming resolve_name_timing = LINE_GET_RULES(rule_line)->resolve_name_timing;
bool is_match = IN_SET(op, OP_MATCH, OP_NOMATCH);
int r;
assert(key);
assert(value);
if (streq(key, "ACTION")) {
if (attr)
return log_line_invalid_attr(rule_line, key);
if (!is_match)
return log_line_invalid_op(rule_line, key);
r = rule_line_add_token(rule_line, TK_M_ACTION, op, value, NULL);
} else if (streq(key, "DEVPATH")) {
if (attr)
return log_line_invalid_attr(rule_line, key);
if (!is_match)
return log_line_invalid_op(rule_line, key);
r = rule_line_add_token(rule_line, TK_M_DEVPATH, op, value, NULL);
} else if (streq(key, "KERNEL")) {
if (attr)
return log_line_invalid_attr(rule_line, key);
if (!is_match)
return log_line_invalid_op(rule_line, key);
r = rule_line_add_token(rule_line, TK_M_KERNEL, op, value, NULL);
} else if (streq(key, "SYMLINK")) {
if (attr)
return log_line_invalid_attr(rule_line, key);
if (!is_match) {
check_value_format_and_warn(rule_line, key, value, false);
r = rule_line_add_token(rule_line, TK_A_DEVLINK, op, value, NULL);
} else
r = rule_line_add_token(rule_line, TK_M_DEVLINK, op, value, NULL);
} else if (streq(key, "NAME")) {
if (attr)
return log_line_invalid_attr(rule_line, key);
if (op == OP_REMOVE)
return log_line_invalid_op(rule_line, key);
if (op == OP_ADD) {
log_line_warning(rule_line, "%s key takes '==', '!=', '=', or ':=' operator, assuming '='.", key);
op = OP_ASSIGN;
}
if (!is_match) {
if (streq(value, "%k"))
return log_line_error_errno(rule_line, SYNTHETIC_ERRNO(EINVAL),
"Ignoring NAME=\"%%k\", as it will take no effect.");
if (isempty(value))
return log_line_error_errno(rule_line, SYNTHETIC_ERRNO(EINVAL),
"Ignoring NAME=\"\", as udev will not delete any network interfaces.");
check_value_format_and_warn(rule_line, key, value, false);
r = rule_line_add_token(rule_line, TK_A_NAME, op, value, NULL);
} else
r = rule_line_add_token(rule_line, TK_M_NAME, op, value, NULL);
} else if (streq(key, "ENV")) {
if (isempty(attr))
return log_line_invalid_attr(rule_line, key);
if (op == OP_REMOVE)
return log_line_invalid_op(rule_line, key);
if (op == OP_ASSIGN_FINAL) {
log_line_warning(rule_line, "%s key takes '==', '!=', '=', or '+=' operator, assuming '='.", key);
op = OP_ASSIGN;
}
if (!is_match) {
if (!device_property_can_set(attr))
return log_line_error_errno(rule_line, SYNTHETIC_ERRNO(EINVAL),
"Invalid ENV attribute. '%s' cannot be set.", attr);
check_value_format_and_warn(rule_line, key, value, false);
r = rule_line_add_token(rule_line, TK_A_ENV, op, value, attr);
} else
r = rule_line_add_token(rule_line, TK_M_ENV, op, value, attr);
} else if (streq(key, "CONST")) {
if (isempty(attr) || !STR_IN_SET(attr, "arch", "virt"))
return log_line_invalid_attr(rule_line, key);
if (!is_match)
return log_line_invalid_op(rule_line, key);
r = rule_line_add_token(rule_line, TK_M_CONST, op, value, attr);
} else if (streq(key, "TAG")) {
if (attr)
return log_line_invalid_attr(rule_line, key);
if (op == OP_ASSIGN_FINAL) {
log_line_warning(rule_line, "%s key takes '==', '!=', '=', or '+=' operator, assuming '='.", key);
op = OP_ASSIGN;
}
if (!is_match) {
check_value_format_and_warn(rule_line, key, value, true);
r = rule_line_add_token(rule_line, TK_A_TAG, op, value, NULL);
} else
r = rule_line_add_token(rule_line, TK_M_TAG, op, value, NULL);
} else if (streq(key, "SUBSYSTEM")) {
if (attr)
return log_line_invalid_attr(rule_line, key);
if (!is_match)
return log_line_invalid_op(rule_line, key);
if (STR_IN_SET(value, "bus", "class"))
log_line_warning(rule_line, "\"%s\" must be specified as \"subsystem\".", value);
r = rule_line_add_token(rule_line, TK_M_SUBSYSTEM, op, value, NULL);
} else if (streq(key, "DRIVER")) {
if (attr)
return log_line_invalid_attr(rule_line, key);
if (!is_match)
return log_line_invalid_op(rule_line, key);
r = rule_line_add_token(rule_line, TK_M_DRIVER, op, value, NULL);
} else if (streq(key, "ATTR")) {
r = check_attr_format_and_warn(rule_line, key, attr);
if (r < 0)
return r;
if (op == OP_REMOVE)
return log_line_invalid_op(rule_line, key);
if (IN_SET(op, OP_ADD, OP_ASSIGN_FINAL)) {
log_line_warning(rule_line, "%s key takes '==', '!=', or '=' operator, assuming '='.", key);
op = OP_ASSIGN;
}
if (!is_match) {
check_value_format_and_warn(rule_line, key, value, false);
r = rule_line_add_token(rule_line, TK_A_ATTR, op, value, attr);
} else
r = rule_line_add_token(rule_line, TK_M_ATTR, op, value, attr);
} else if (streq(key, "SYSCTL")) {
r = check_attr_format_and_warn(rule_line, key, attr);
if (r < 0)
return r;
if (op == OP_REMOVE)
return log_line_invalid_op(rule_line, key);
if (IN_SET(op, OP_ADD, OP_ASSIGN_FINAL)) {
log_line_warning(rule_line, "%s key takes '==', '!=', or '=' operator, assuming '='.", key);
op = OP_ASSIGN;
}
if (!is_match) {
check_value_format_and_warn(rule_line, key, value, false);
r = rule_line_add_token(rule_line, TK_A_SYSCTL, op, value, attr);
} else
r = rule_line_add_token(rule_line, TK_M_SYSCTL, op, value, attr);
} else if (streq(key, "KERNELS")) {
if (attr)
return log_line_invalid_attr(rule_line, key);
if (!is_match)
return log_line_invalid_op(rule_line, key);
r = rule_line_add_token(rule_line, TK_M_PARENTS_KERNEL, op, value, NULL);
} else if (streq(key, "SUBSYSTEMS")) {
if (attr)
return log_line_invalid_attr(rule_line, key);
if (!is_match)
return log_line_invalid_op(rule_line, key);
r = rule_line_add_token(rule_line, TK_M_PARENTS_SUBSYSTEM, op, value, NULL);
} else if (streq(key, "DRIVERS")) {
if (attr)
return log_line_invalid_attr(rule_line, key);
if (!is_match)
return log_line_invalid_op(rule_line, key);
r = rule_line_add_token(rule_line, TK_M_PARENTS_DRIVER, op, value, NULL);
} else if (streq(key, "ATTRS")) {
r = check_attr_format_and_warn(rule_line, key, attr);
if (r < 0)
return r;
if (!is_match)
return log_line_invalid_op(rule_line, key);
if (startswith(attr, "device/"))
log_line_warning(rule_line, "'device' link may not be available in future kernels.");
if (strstr(attr, "../"))
log_line_warning(rule_line, "Direct reference to parent sysfs directory, may break in future kernels.");
r = rule_line_add_token(rule_line, TK_M_PARENTS_ATTR, op, value, attr);
} else if (streq(key, "TAGS")) {
if (attr)
return log_line_invalid_attr(rule_line, key);
if (!is_match)
return log_line_invalid_op(rule_line, key);
r = rule_line_add_token(rule_line, TK_M_PARENTS_TAG, op, value, NULL);
} else if (streq(key, "TEST")) {
mode_t mode = MODE_INVALID;
if (!isempty(attr)) {
r = parse_mode(attr, &mode);
if (r < 0)
return log_line_error_errno(rule_line, r, "Failed to parse mode '%s': %m", attr);
}
check_value_format_and_warn(rule_line, key, value, true);
if (!is_match)
return log_line_invalid_op(rule_line, key);
r = rule_line_add_token(rule_line, TK_M_TEST, op, value, MODE_TO_PTR(mode));
} else if (streq(key, "PROGRAM")) {
if (attr)
return log_line_invalid_attr(rule_line, key);
check_value_format_and_warn(rule_line, key, value, true);
if (op == OP_REMOVE)
return log_line_invalid_op(rule_line, key);
if (!is_match)
op = OP_MATCH;
r = rule_line_add_token(rule_line, TK_M_PROGRAM, op, value, NULL);
} else if (streq(key, "IMPORT")) {
if (isempty(attr))
return log_line_invalid_attr(rule_line, key);
check_value_format_and_warn(rule_line, key, value, true);
if (op == OP_REMOVE)
return log_line_invalid_op(rule_line, key);
if (!is_match)
op = OP_MATCH;
if (streq(attr, "file"))
r = rule_line_add_token(rule_line, TK_M_IMPORT_FILE, op, value, NULL);
else if (streq(attr, "program")) {
UdevBuiltinCommand cmd;
cmd = udev_builtin_lookup(value);
if (cmd >= 0) {
log_line_debug(rule_line, "Found builtin command '%s' for %s, replacing attribute.", value, key);
r = rule_line_add_token(rule_line, TK_M_IMPORT_BUILTIN, op, value, UDEV_BUILTIN_CMD_TO_PTR(cmd));
} else
r = rule_line_add_token(rule_line, TK_M_IMPORT_PROGRAM, op, value, NULL);
} else if (streq(attr, "builtin")) {
UdevBuiltinCommand cmd;
cmd = udev_builtin_lookup(value);
if (cmd < 0)
return log_line_error_errno(rule_line, SYNTHETIC_ERRNO(EINVAL),
"Unknown builtin command: %s", value);
r = rule_line_add_token(rule_line, TK_M_IMPORT_BUILTIN, op, value, UDEV_BUILTIN_CMD_TO_PTR(cmd));
} else if (streq(attr, "db"))
r = rule_line_add_token(rule_line, TK_M_IMPORT_DB, op, value, NULL);
else if (streq(attr, "cmdline"))
r = rule_line_add_token(rule_line, TK_M_IMPORT_CMDLINE, op, value, NULL);
else if (streq(attr, "parent"))
r = rule_line_add_token(rule_line, TK_M_IMPORT_PARENT, op, value, NULL);
else
return log_line_invalid_attr(rule_line, key);
} else if (streq(key, "RESULT")) {
if (attr)
return log_line_invalid_attr(rule_line, key);
if (!is_match)
return log_line_invalid_op(rule_line, key);
r = rule_line_add_token(rule_line, TK_M_RESULT, op, value, NULL);
} else if (streq(key, "OPTIONS")) {
char *tmp;
if (attr)
return log_line_invalid_attr(rule_line, key);
if (is_match || op == OP_REMOVE)
return log_line_invalid_op(rule_line, key);
if (op == OP_ADD)
op = OP_ASSIGN;
if (streq(value, "string_escape=none"))
r = rule_line_add_token(rule_line, TK_A_OPTIONS_STRING_ESCAPE_NONE, op, NULL, NULL);
else if (streq(value, "string_escape=replace"))
r = rule_line_add_token(rule_line, TK_A_OPTIONS_STRING_ESCAPE_REPLACE, op, NULL, NULL);
else if (streq(value, "db_persist"))
r = rule_line_add_token(rule_line, TK_A_OPTIONS_DB_PERSIST, op, NULL, NULL);
else if (streq(value, "watch"))
r = rule_line_add_token(rule_line, TK_A_OPTIONS_INOTIFY_WATCH, op, NULL, INT_TO_PTR(1));
else if (streq(value, "nowatch"))
r = rule_line_add_token(rule_line, TK_A_OPTIONS_INOTIFY_WATCH, op, NULL, INT_TO_PTR(0));
else if ((tmp = startswith(value, "static_node=")))
r = rule_line_add_token(rule_line, TK_A_OPTIONS_STATIC_NODE, op, tmp, NULL);
else if ((tmp = startswith(value, "link_priority="))) {
int prio;
r = safe_atoi(tmp, &prio);
if (r < 0)
return log_line_error_errno(rule_line, r, "Failed to parse link priority '%s': %m", tmp);
r = rule_line_add_token(rule_line, TK_A_OPTIONS_DEVLINK_PRIORITY, op, NULL, INT_TO_PTR(prio));
} else if ((tmp = startswith(value, "log_level="))) {
int level;
if (streq(tmp, "reset"))
level = -1;
else {
level = log_level_from_string(tmp);
if (level < 0)
return log_line_error_errno(rule_line, level, "Failed to parse log level '%s': %m", tmp);
}
r = rule_line_add_token(rule_line, TK_A_OPTIONS_LOG_LEVEL, op, NULL, INT_TO_PTR(level));
} else {
log_line_warning(rule_line, "Invalid value for OPTIONS key, ignoring: '%s'", value);
return 0;
}
} else if (streq(key, "OWNER")) {
uid_t uid;
if (attr)
return log_line_invalid_attr(rule_line, key);
if (is_match || op == OP_REMOVE)
return log_line_invalid_op(rule_line, key);
if (op == OP_ADD) {
log_line_warning(rule_line, "%s key takes '=' or ':=' operator, assuming '='.", key);
op = OP_ASSIGN;
}
if (parse_uid(value, &uid) >= 0)
r = rule_line_add_token(rule_line, TK_A_OWNER_ID, op, NULL, UID_TO_PTR(uid));
else if (resolve_name_timing == RESOLVE_NAME_EARLY &&
rule_get_substitution_type(value) == SUBST_TYPE_PLAIN) {
r = rule_resolve_user(rule_line, value, &uid);
if (r < 0)
return log_line_error_errno(rule_line, r, "Failed to resolve user name '%s': %m", value);
r = rule_line_add_token(rule_line, TK_A_OWNER_ID, op, NULL, UID_TO_PTR(uid));
} else if (resolve_name_timing != RESOLVE_NAME_NEVER) {
check_value_format_and_warn(rule_line, key, value, true);
r = rule_line_add_token(rule_line, TK_A_OWNER, op, value, NULL);
} else {
log_line_debug(rule_line, "User name resolution is disabled, ignoring %s=\"%s\".", key, value);
return 0;
}
} else if (streq(key, "GROUP")) {
gid_t gid;
if (attr)
return log_line_invalid_attr(rule_line, key);
if (is_match || op == OP_REMOVE)
return log_line_invalid_op(rule_line, key);
if (op == OP_ADD) {
log_line_warning(rule_line, "%s key takes '=' or ':=' operator, assuming '='.", key);
op = OP_ASSIGN;
}
if (parse_gid(value, &gid) >= 0)
r = rule_line_add_token(rule_line, TK_A_GROUP_ID, op, NULL, GID_TO_PTR(gid));
else if (resolve_name_timing == RESOLVE_NAME_EARLY &&
rule_get_substitution_type(value) == SUBST_TYPE_PLAIN) {
r = rule_resolve_group(rule_line, value, &gid);
if (r < 0)
return log_line_error_errno(rule_line, r, "Failed to resolve group name '%s': %m", value);
r = rule_line_add_token(rule_line, TK_A_GROUP_ID, op, NULL, GID_TO_PTR(gid));
} else if (resolve_name_timing != RESOLVE_NAME_NEVER) {
check_value_format_and_warn(rule_line, key, value, true);
r = rule_line_add_token(rule_line, TK_A_GROUP, op, value, NULL);
} else {
log_line_debug(rule_line, "Resolving group name is disabled, ignoring GROUP=\"%s\".", value);
return 0;
}
} else if (streq(key, "MODE")) {
mode_t mode;
if (attr)
return log_line_invalid_attr(rule_line, key);
if (is_match || op == OP_REMOVE)
return log_line_invalid_op(rule_line, key);
if (op == OP_ADD) {
log_line_warning(rule_line, "%s key takes '=' or ':=' operator, assuming '='.", key);
op = OP_ASSIGN;
}
if (parse_mode(value, &mode) >= 0)
r = rule_line_add_token(rule_line, TK_A_MODE_ID, op, NULL, MODE_TO_PTR(mode));
else {
check_value_format_and_warn(rule_line, key, value, true);
r = rule_line_add_token(rule_line, TK_A_MODE, op, value, NULL);
}
} else if (streq(key, "SECLABEL")) {
if (isempty(attr))
return log_line_invalid_attr(rule_line, key);
check_value_format_and_warn(rule_line, key, value, true);
if (is_match || op == OP_REMOVE)
return log_line_invalid_op(rule_line, key);
if (op == OP_ASSIGN_FINAL) {
log_line_warning(rule_line, "%s key takes '=' or '+=' operator, assuming '='.", key);
op = OP_ASSIGN;
}
r = rule_line_add_token(rule_line, TK_A_SECLABEL, op, value, attr);
} else if (streq(key, "RUN")) {
if (is_match || op == OP_REMOVE)
return log_line_invalid_op(rule_line, key);
check_value_format_and_warn(rule_line, key, value, true);
if (!attr || streq(attr, "program"))
r = rule_line_add_token(rule_line, TK_A_RUN_PROGRAM, op, value, NULL);
else if (streq(attr, "builtin")) {
UdevBuiltinCommand cmd;
cmd = udev_builtin_lookup(value);
if (cmd < 0)
return log_line_error_errno(rule_line, SYNTHETIC_ERRNO(EINVAL),
"Unknown builtin command '%s', ignoring.", value);
r = rule_line_add_token(rule_line, TK_A_RUN_BUILTIN, op, value, UDEV_BUILTIN_CMD_TO_PTR(cmd));
} else
return log_line_invalid_attr(rule_line, key);
} else if (streq(key, "GOTO")) {
if (attr)
return log_line_invalid_attr(rule_line, key);
if (op != OP_ASSIGN)
return log_line_invalid_op(rule_line, key);
if (FLAGS_SET(rule_line->type, LINE_HAS_GOTO)) {
log_line_warning(rule_line, "Contains multiple GOTO keys, ignoring GOTO=\"%s\".", value);
return 0;
}
rule_line->goto_label = value;
SET_FLAG(rule_line->type, LINE_HAS_GOTO, true);
return 1;
} else if (streq(key, "LABEL")) {
if (attr)
return log_line_invalid_attr(rule_line, key);
if (op != OP_ASSIGN)
return log_line_invalid_op(rule_line, key);
if (FLAGS_SET(rule_line->type, LINE_HAS_LABEL))
log_line_warning(rule_line, "Contains multiple LABEL keys, ignoring LABEL=\"%s\".",
rule_line->label);
rule_line->label = value;
SET_FLAG(rule_line->type, LINE_HAS_LABEL, true);
return 1;
} else
return log_line_error_errno(rule_line, SYNTHETIC_ERRNO(EINVAL), "Invalid key '%s'.", key);
if (r < 0)
return log_oom();
return 1;
}
static UdevRuleOperatorType parse_operator(const char *op) {
assert(op);
if (startswith(op, "=="))
return OP_MATCH;
if (startswith(op, "!="))
return OP_NOMATCH;
if (startswith(op, "+="))
return OP_ADD;
if (startswith(op, "-="))
return OP_REMOVE;
if (startswith(op, "="))
return OP_ASSIGN;
if (startswith(op, ":="))
return OP_ASSIGN_FINAL;
return _OP_TYPE_INVALID;
}
static void check_token_delimiters(UdevRuleLine *rule_line, const char *line) {
assert(rule_line);
size_t n_comma = 0;
bool ws_before_comma = false, ws_after_comma = false;
const char *p;
for (p = line; !isempty(p); ++p) {
if (*p == ',')
++n_comma;
else if (strchr(WHITESPACE, *p)) {
if (n_comma > 0)
ws_after_comma = true;
else
ws_before_comma = true;
} else
break;
}
if (line == rule_line->line) {
/* this is the first token of the rule */
if (n_comma > 0)
log_line_notice(rule_line, "style: stray leading comma.");
} else if (isempty(p)) {
/* there are no more tokens in the rule */
if (n_comma > 0)
log_line_notice(rule_line, "style: stray trailing comma.");
} else {
/* single comma is expected */
if (n_comma == 0)
log_line_notice(rule_line, "style: a comma between tokens is expected.");
else if (n_comma > 1)
log_line_notice(rule_line, "style: more than one comma between tokens.");
/* whitespace after comma is expected */
if (n_comma > 0) {
if (ws_before_comma)
log_line_notice(rule_line, "style: stray whitespace before comma.");
if (!ws_after_comma)
log_line_notice(rule_line, "style: whitespace after comma is expected.");
} else if (!ws_before_comma && !ws_after_comma)
log_line_notice(rule_line, "style: whitespace between tokens is expected.");
}
}
int udev_rule_parse_value(char *str, char **ret_value, char **ret_endpos) {
char *i, *j;
bool is_escaped;
/* value must be double quotated */
is_escaped = str[0] == 'e';
str += is_escaped;
if (str[0] != '"')
return -EINVAL;
if (!is_escaped) {
/* unescape double quotation '\"'->'"' */
for (j = str, i = str + 1; *i != '"'; i++, j++) {
if (*i == '\0')
return -EINVAL;
if (i[0] == '\\' && i[1] == '"')
i++;
*j = *i;
}
j[0] = '\0';
/*
* The return value must be terminated by two subsequent NULs
* so it could be safely interpreted as nulstr.
*/
j[1] = '\0';
} else {
_cleanup_free_ char *unescaped = NULL;
ssize_t l;
/* find the end position of value */
for (i = str + 1; *i != '"'; i++) {
if (i[0] == '\\')
i++;
if (*i == '\0')
return -EINVAL;
}
i[0] = '\0';
l = cunescape_length(str + 1, i - (str + 1), 0, &unescaped);
if (l < 0)
return l;
assert(l <= i - (str + 1));
memcpy(str, unescaped, l + 1);
/*
* The return value must be terminated by two subsequent NULs
* so it could be safely interpreted as nulstr.
*/
str[l + 1] = '\0';
}
*ret_value = str;
*ret_endpos = i + 1;
return 0;
}
static int parse_line(char **line, char **ret_key, char **ret_attr, UdevRuleOperatorType *ret_op, char **ret_value) {
char *key_begin, *key_end, *attr, *tmp;
UdevRuleOperatorType op;
int r;
assert(line);
assert(*line);
assert(ret_key);
assert(ret_op);
assert(ret_value);
key_begin = skip_leading_chars(*line, WHITESPACE ",");
if (isempty(key_begin))
return 0;
for (key_end = key_begin; ; key_end++) {
if (key_end[0] == '\0')
return -EINVAL;
if (strchr(WHITESPACE "={", key_end[0]))
break;
if (strchr("+-!:", key_end[0]) && key_end[1] == '=')
break;
}
if (key_end[0] == '{') {
attr = key_end + 1;
tmp = strchr(attr, '}');
if (!tmp)
return -EINVAL;
*tmp++ = '\0';
} else {
attr = NULL;
tmp = key_end;
}
tmp = skip_leading_chars(tmp, NULL);
op = parse_operator(tmp);
if (op < 0)
return -EINVAL;
key_end[0] = '\0';
tmp += op == OP_ASSIGN ? 1 : 2;
tmp = skip_leading_chars(tmp, NULL);
r = udev_rule_parse_value(tmp, ret_value, line);
if (r < 0)
return r;
*ret_key = key_begin;
*ret_attr = attr;
*ret_op = op;
return 1;
}
static void check_tokens_order(UdevRuleLine *rule_line) {
bool has_result = false;
assert(rule_line);
LIST_FOREACH(tokens, t, rule_line->tokens)
if (t->type == TK_M_RESULT)
has_result = true;
else if (has_result && t->type == TK_M_PROGRAM) {
log_line_warning(rule_line, "Reordering RESULT check after PROGRAM assignment.");
break;
}
}
static void sort_tokens(UdevRuleLine *rule_line) {
assert(rule_line);
UdevRuleToken *old_tokens = TAKE_PTR(rule_line->tokens);
while (old_tokens) {
UdevRuleToken *min_token = NULL;
LIST_FOREACH(tokens, t, old_tokens)
if (!min_token || min_token->type > t->type)
min_token = t;
LIST_REMOVE(tokens, old_tokens, min_token);
LIST_APPEND(tokens, rule_line->tokens, min_token);
}
}
static int rule_add_line(UdevRuleFile *rule_file, const char *line_str, unsigned line_nr, bool extra_checks) {
_cleanup_(udev_rule_line_freep) UdevRuleLine *rule_line = NULL;
_cleanup_free_ char *line = NULL;
char *p;
int r;
assert(rule_file);
assert(line_str);
if (isempty(line_str))
return 0;
line = strdup(line_str);
if (!line)
return log_oom();
rule_line = new(UdevRuleLine, 1);
if (!rule_line)
return log_oom();
*rule_line = (UdevRuleLine) {
.line = TAKE_PTR(line),
.line_number = line_nr,
.rule_file = rule_file,
};
LIST_APPEND(rule_lines, rule_file->rule_lines, rule_line);
for (p = rule_line->line; !isempty(p); ) {
char *key, *attr, *value;
UdevRuleOperatorType op;
if (extra_checks)
check_token_delimiters(rule_line, p);
r = parse_line(&p, &key, &attr, &op, &value);
if (r < 0)
return log_line_error_errno(rule_line, r, "Invalid key/value pair, ignoring.");
if (r == 0)
break;
r = parse_token(rule_line, key, attr, op, value);
if (r < 0)
return r;
}
if (rule_line->type == 0) {
log_line_warning(rule_line, "The line has no effect, ignoring.");
return 0;
}
if (extra_checks)
check_tokens_order(rule_line);
sort_tokens(rule_line);
TAKE_PTR(rule_line);
return 0;
}
static void rule_resolve_goto(UdevRuleFile *rule_file) {
assert(rule_file);
/* link GOTOs to LABEL rules in this file to be able to fast-forward */
LIST_FOREACH(rule_lines, line, rule_file->rule_lines) {
if (!FLAGS_SET(line->type, LINE_HAS_GOTO))
continue;
LIST_FOREACH(rule_lines, i, line->rule_lines_next)
if (streq_ptr(i->label, line->goto_label)) {
line->goto_line = i;
SET_FLAG(i->type, LINE_IS_REFERENCED, true);
break;
}
if (!line->goto_line) {
log_line_error(line, "GOTO=\"%s\" has no matching label, ignoring.",
line->goto_label);
SET_FLAG(line->type, LINE_HAS_GOTO, false);
line->goto_label = NULL;
if ((line->type & ~(LINE_HAS_LABEL|LINE_IS_REFERENCED)) == 0) {
log_line_warning(line, "The line has no effect any more, dropping.");
/* LINE_IS_REFERENCED implies LINE_HAS_LABEL */
if (line->type & LINE_HAS_LABEL)
udev_rule_line_clear_tokens(line);
else
udev_rule_line_free(line);
}
}
}
}
static bool token_data_is_string(UdevRuleTokenType type) {
return IN_SET(type, TK_M_ENV,
TK_M_CONST,
TK_M_ATTR,
TK_M_SYSCTL,
TK_M_PARENTS_ATTR,
TK_A_SECLABEL,
TK_A_ENV,
TK_A_ATTR,
TK_A_SYSCTL);
}
static bool token_type_and_data_eq(const UdevRuleToken *a, const UdevRuleToken *b) {
assert(a);
assert(b);
return a->type == b->type &&
(token_data_is_string(a->type) ? streq_ptr(a->data, b->data) : (a->data == b->data));
}
static bool nulstr_eq(const char *a, const char *b) {
NULSTR_FOREACH(i, a)
if (!nulstr_contains(b, i))
return false;
NULSTR_FOREACH(i, b)
if (!nulstr_contains(a, i))
return false;
return true;
}
static bool token_type_and_value_eq(const UdevRuleToken *a, const UdevRuleToken *b) {
assert(a);
assert(b);
if (a->type != b->type ||
a->match_type != b->match_type)
return false;
/* token value is ignored for certain match types */
if (IN_SET(a->match_type, MATCH_TYPE_EMPTY, MATCH_TYPE_SUBSYSTEM))
return true;
return type_has_nulstr_value(a->type) ? nulstr_eq(a->value, b->value) :
streq_ptr(a->value, b->value);
}
static bool conflicting_op(UdevRuleOperatorType a, UdevRuleOperatorType b) {
return (a == OP_MATCH && b == OP_NOMATCH) ||
(a == OP_NOMATCH && b == OP_MATCH);
}
/* test whether all fields besides UdevRuleOperatorType of two tokens match */
static bool tokens_eq(const UdevRuleToken *a, const UdevRuleToken *b) {
assert(a);
assert(b);
return a->attr_subst_type == b->attr_subst_type &&
a->attr_match_remove_trailing_whitespace == b->attr_match_remove_trailing_whitespace &&
token_type_and_value_eq(a, b) &&
token_type_and_data_eq(a, b);
}
static bool nulstr_tokens_conflict(const UdevRuleToken *a, const UdevRuleToken *b) {
assert(a);
assert(b);
if (!(a->type == b->type &&
type_has_nulstr_value(a->type) &&
a->op == b->op &&
a->op == OP_MATCH &&
a->match_type == b->match_type &&
a->attr_subst_type == b->attr_subst_type &&
a->attr_match_remove_trailing_whitespace == b->attr_match_remove_trailing_whitespace &&
token_type_and_data_eq(a, b)))
return false;
if (a->match_type == MATCH_TYPE_PLAIN) {
NULSTR_FOREACH(i, a->value)
if (nulstr_contains(b->value, i))
return false;
return true;
}
if (a->match_type == MATCH_TYPE_GLOB) {
NULSTR_FOREACH(i, a->value) {
size_t i_n = strcspn(i, GLOB_CHARS);
if (i_n == 0)
return false;
NULSTR_FOREACH(j, b->value) {
size_t j_n = strcspn(j, GLOB_CHARS);
if (j_n == 0 || strneq(i, j, MIN(i_n, j_n)))
return false;
}
}
return true;
}
return false;
}
static void udev_check_unused_labels(UdevRuleLine *line) {
assert(line);
if (FLAGS_SET(line->type, LINE_HAS_LABEL) &&
!FLAGS_SET(line->type, LINE_IS_REFERENCED))
log_line_notice(line, "style: LABEL=\"%s\" is unused.", line->label);
}
static void udev_check_conflicts_duplicates(UdevRuleLine *line) {
assert(line);
bool conflicts = false, duplicates = false;
LIST_FOREACH(tokens, token, line->tokens)
LIST_FOREACH(tokens, i, token->tokens_next) {
bool new_conflicts = false, new_duplicates = false;
if (tokens_eq(token, i)) {
if (!duplicates && token->op == i->op)
new_duplicates = true;
if (!conflicts && conflicting_op(token->op, i->op))
new_conflicts = true;
} else if (!conflicts && nulstr_tokens_conflict(token, i))
new_conflicts = true;
else
continue;
if (new_duplicates) {
duplicates = new_duplicates;
log_line_warning(line, "duplicate expressions.");
}
if (new_conflicts) {
conflicts = new_conflicts;
log_line_error(line, "conflicting match expressions, the line has no effect.");
}
if (conflicts && duplicates)
return;
}
}
static void udev_check_rule_line(UdevRuleLine *line) {
udev_check_unused_labels(line);
udev_check_conflicts_duplicates(line);
}
int udev_rules_parse_file(UdevRules *rules, const char *filename, bool extra_checks, UdevRuleFile **ret) {
_cleanup_(udev_rule_file_freep) UdevRuleFile *rule_file = NULL;
_cleanup_free_ char *continuation = NULL, *name = NULL;
_cleanup_fclose_ FILE *f = NULL;
bool ignore_line = false;
unsigned line_nr = 0;
struct stat st;
int r;
assert(rules);
assert(filename);
f = fopen(filename, "re");
if (!f) {
if (extra_checks)
return -errno;
if (errno == ENOENT)
return 0;
return log_warning_errno(errno, "Failed to open %s, ignoring: %m", filename);
}
if (fstat(fileno(f), &st) < 0)
return log_warning_errno(errno, "Failed to stat %s, ignoring: %m", filename);
if (null_or_empty(&st)) {
log_debug("Skipping empty file: %s", filename);
if (ret)
*ret = NULL;
return 0;
}
r = hashmap_put_stats_by_path(&rules->stats_by_path, filename, &st);
if (r < 0)
return log_warning_errno(errno, "Failed to save stat for %s, ignoring: %m", filename);
(void) fd_warn_permissions(filename, fileno(f));
log_debug("Reading rules file: %s", filename);
name = strdup(filename);
if (!name)
return log_oom();
rule_file = new(UdevRuleFile, 1);
if (!rule_file)
return log_oom();
*rule_file = (UdevRuleFile) {
.filename = TAKE_PTR(name),
.rules = rules,
};
LIST_APPEND(rule_files, rules->rule_files, rule_file);
for (;;) {
_cleanup_free_ char *buf = NULL;
size_t len;
char *line;
r = read_line(f, UDEV_LINE_SIZE, &buf);
if (r < 0)
return r;
if (r == 0)
break;
line_nr++;
line = skip_leading_chars(buf, NULL);
/* Lines beginning with '#' are ignored regardless of line continuation. */
if (line[0] == '#')
continue;
len = strlen(line);
if (continuation && !ignore_line) {
if (strlen(continuation) + len >= UDEV_LINE_SIZE)
ignore_line = true;
if (!strextend(&continuation, line))
return log_oom();
if (!ignore_line) {
line = continuation;
len = strlen(line);
}
}
if (len > 0 && line[len - 1] == '\\') {
if (ignore_line)
continue;
line[len - 1] = '\0';
if (!continuation) {
continuation = strdup(line);
if (!continuation)
return log_oom();
}
continue;
}
if (ignore_line)
log_file_error(rule_file, line_nr, "Line is too long, ignored.");
else if (len > 0)
(void) rule_add_line(rule_file, line, line_nr, extra_checks);
continuation = mfree(continuation);
ignore_line = false;
}
if (continuation)
log_file_error(rule_file, line_nr,
"Unexpected EOF after line continuation, line ignored.");
rule_resolve_goto(rule_file);
if (extra_checks)
LIST_FOREACH(rule_lines, line, rule_file->rule_lines)
udev_check_rule_line(line);
if (ret)
*ret = rule_file;
TAKE_PTR(rule_file);
return 1;
}
unsigned udev_rule_file_get_issues(UdevRuleFile *rule_file) {
assert(rule_file);
return rule_file->issues;
}
UdevRules* udev_rules_new(ResolveNameTiming resolve_name_timing) {
assert(resolve_name_timing >= 0 && resolve_name_timing < _RESOLVE_NAME_TIMING_MAX);
UdevRules *rules = new(UdevRules, 1);
if (!rules)
return NULL;
*rules = (UdevRules) {
.resolve_name_timing = resolve_name_timing,
};
return rules;
}
int udev_rules_load(UdevRules **ret_rules, ResolveNameTiming resolve_name_timing) {
_cleanup_(udev_rules_freep) UdevRules *rules = NULL;
_cleanup_strv_free_ char **files = NULL;
int r;
rules = udev_rules_new(resolve_name_timing);
if (!rules)
return -ENOMEM;
r = conf_files_list_strv(&files, ".rules", NULL, 0, RULES_DIRS);
if (r < 0)
return log_debug_errno(r, "Failed to enumerate rules files: %m");
STRV_FOREACH(f, files) {
r = udev_rules_parse_file(rules, *f, /* extra_checks = */ false, NULL);
if (r < 0)
log_debug_errno(r, "Failed to read rules file %s, ignoring: %m", *f);
}
*ret_rules = TAKE_PTR(rules);
return 0;
}
bool udev_rules_should_reload(UdevRules *rules) {
_cleanup_hashmap_free_ Hashmap *stats_by_path = NULL;
int r;
if (!rules)
return true;
r = config_get_stats_by_path(".rules", NULL, 0, RULES_DIRS, /* check_dropins = */ false, &stats_by_path);
if (r < 0) {
log_warning_errno(r, "Failed to get stats of udev rules, ignoring: %m");
return true;
}
if (!stats_by_path_equal(rules->stats_by_path, stats_by_path)) {
log_debug("Udev rules need reloading");
return true;
}
return false;
}
static bool token_match_string(UdevRuleToken *token, const char *str) {
const char *value;
bool match = false;
assert(token);
assert(token->value);
assert(token->type < _TK_M_MAX);
str = strempty(str);
value = token->value;
switch (token->match_type) {
case MATCH_TYPE_EMPTY:
match = isempty(str);
break;
case MATCH_TYPE_SUBSYSTEM:
match = STR_IN_SET(str, "subsystem", "class", "bus");
break;
case MATCH_TYPE_PLAIN_WITH_EMPTY:
if (isempty(str)) {
match = true;
break;
}
_fallthrough_;
case MATCH_TYPE_PLAIN:
NULSTR_FOREACH(i, value)
if (streq(i, str)) {
match = true;
break;
}
break;
case MATCH_TYPE_GLOB_WITH_EMPTY:
if (isempty(str)) {
match = true;
break;
}
_fallthrough_;
case MATCH_TYPE_GLOB:
NULSTR_FOREACH(i, value)
if ((fnmatch(i, str, 0) == 0)) {
match = true;
break;
}
break;
default:
assert_not_reached();
}
return token->op == (match ? OP_MATCH : OP_NOMATCH);
}
static bool token_match_attr(UdevRuleToken *token, sd_device *dev, UdevEvent *event) {
char nbuf[UDEV_NAME_SIZE], vbuf[UDEV_NAME_SIZE];
const char *name, *value;
bool truncated;
assert(token);
assert(IN_SET(token->type, TK_M_ATTR, TK_M_PARENTS_ATTR));
assert(dev);
assert(event);
name = token->data;
switch (token->attr_subst_type) {
case SUBST_TYPE_FORMAT:
(void) udev_event_apply_format(event, name, nbuf, sizeof(nbuf), false, &truncated);
if (truncated) {
log_event_truncated(dev, token, "sysfs attribute name", name,
token->type == TK_M_ATTR ? "ATTR" : "ATTRS", /* is_match = */ true);
return false;
}
name = nbuf;
_fallthrough_;
case SUBST_TYPE_PLAIN:
if (sd_device_get_sysattr_value(dev, name, &value) < 0)
return false;
break;
case SUBST_TYPE_SUBSYS:
if (udev_resolve_subsys_kernel(name, vbuf, sizeof(vbuf), true) < 0)
return false;
value = vbuf;
break;
default:
assert_not_reached();
}
/* remove trailing whitespace, if not asked to match for it */
if (token->attr_match_remove_trailing_whitespace) {
if (value != vbuf) {
strscpy(vbuf, sizeof(vbuf), value);
value = vbuf;
}
delete_trailing_chars(vbuf, NULL);
}
return token_match_string(token, value);
}
static int get_property_from_string(char *line, char **ret_key, char **ret_value) {
char *key, *val;
size_t len;
assert(line);
assert(ret_key);
assert(ret_value);
/* find key */
key = skip_leading_chars(line, NULL);
/* comment or empty line */
if (IN_SET(key[0], '#', '\0')) {
*ret_key = *ret_value = NULL;
return 0;
}
/* split key/value */
val = strchr(key, '=');
if (!val)
return -EINVAL;
*val++ = '\0';
key = strstrip(key);
if (isempty(key))
return -EINVAL;
val = strstrip(val);
if (isempty(val))
return -EINVAL;
/* unquote */
if (IN_SET(val[0], '"', '\'')) {
len = strlen(val);
if (len == 1 || val[len-1] != val[0])
return -EINVAL;
val[len-1] = '\0';
val++;
}
*ret_key = key;
*ret_value = val;
return 1;
}
static int import_parent_into_properties(sd_device *dev, const char *filter) {
sd_device *parent;
int r;
assert(dev);
assert(filter);
r = sd_device_get_parent(dev, &parent);
if (r == -ENOENT)
return 0;
if (r < 0)
return r;
FOREACH_DEVICE_PROPERTY(parent, key, val) {
if (fnmatch(filter, key, 0) != 0)
continue;
r = device_add_property(dev, key, val);
if (r < 0)
return r;
}
return 1;
}
static int attr_subst_subdir(char attr[static UDEV_PATH_SIZE]) {
_cleanup_closedir_ DIR *dir = NULL;
char buf[UDEV_PATH_SIZE], *p;
const char *tail;
size_t len, size;
bool truncated;
assert(attr);
tail = strstr(attr, "/*/");
if (!tail)
return 0;
len = tail - attr + 1; /* include slash at the end */
tail += 2; /* include slash at the beginning */
p = buf;
size = sizeof(buf);
size -= strnpcpy_full(&p, size, attr, len, &truncated);
if (truncated)
return -ENOENT;
dir = opendir(buf);
if (!dir)
return -errno;
FOREACH_DIRENT_ALL(de, dir, break) {
if (de->d_name[0] == '.')
continue;
strscpyl_full(p, size, &truncated, de->d_name, tail, NULL);
if (truncated)
continue;
if (faccessat(dirfd(dir), p, F_OK, 0) < 0)
continue;
strcpy(attr, buf);
return 0;
}
return -ENOENT;
}
static size_t udev_replace_ifname(char *str) {
size_t replaced = 0;
assert(str);
/* See ifname_valid_full(). */
for (char *p = str; *p != '\0'; p++)
if (!ifname_valid_char(*p)) {
*p = '_';
replaced++;
}
return replaced;
}
static int udev_rule_apply_token_to_event(
UdevRuleToken *token,
sd_device *dev,
UdevEvent *event) {
int r;
assert(token);
assert(dev);
assert(event);
/* This returns the following values:
* 0 on the current token does not match the event,
* 1 on the current token matches the event, and
* negative errno on some critical errors. */
switch (token->type) {
case TK_M_ACTION: {
sd_device_action_t a;
r = sd_device_get_action(dev, &a);
if (r < 0)
return log_event_error_errno(dev, token, r, "Failed to get uevent action type: %m");
return token_match_string(token, device_action_to_string(a));
}
case TK_M_DEVPATH: {
const char *val;
r = sd_device_get_devpath(dev, &val);
if (r < 0)
return log_event_error_errno(dev, token, r, "Failed to get devpath: %m");
return token_match_string(token, val);
}
case TK_M_KERNEL:
case TK_M_PARENTS_KERNEL: {
const char *val;
r = sd_device_get_sysname(dev, &val);
if (r < 0)
return log_event_error_errno(dev, token, r, "Failed to get sysname: %m");
return token_match_string(token, val);
}
case TK_M_DEVLINK:
FOREACH_DEVICE_DEVLINK(dev, val)
if (token_match_string(token, strempty(startswith(val, "/dev/"))) == (token->op == OP_MATCH))
return token->op == OP_MATCH;
return token->op == OP_NOMATCH;
case TK_M_NAME:
return token_match_string(token, event->name);
case TK_M_ENV: {
const char *val = NULL;
(void) device_get_property_value_with_fallback(dev, token->data, event->worker ? event->worker->properties : NULL, &val);
return token_match_string(token, val);
}
case TK_M_CONST: {
const char *val, *k = token->data;
if (streq(k, "arch"))
val = architecture_to_string(uname_architecture());
else if (streq(k, "virt"))
val = virtualization_to_string(detect_virtualization());
else if (streq(k, "cvm"))
val = confidential_virtualization_to_string(detect_confidential_virtualization());
else
assert_not_reached();
return token_match_string(token, val);
}
case TK_M_TAG:
case TK_M_PARENTS_TAG:
FOREACH_DEVICE_CURRENT_TAG(dev, val)
if (token_match_string(token, val) == (token->op == OP_MATCH))
return token->op == OP_MATCH;
return token->op == OP_NOMATCH;
case TK_M_SUBSYSTEM:
case TK_M_PARENTS_SUBSYSTEM: {
const char *val;
r = sd_device_get_subsystem(dev, &val);
if (r == -ENOENT)
val = NULL;
else if (r < 0)
return log_event_error_errno(dev, token, r, "Failed to get subsystem: %m");
return token_match_string(token, val);
}
case TK_M_DRIVER:
case TK_M_PARENTS_DRIVER: {
const char *val;
r = sd_device_get_driver(dev, &val);
if (r == -ENOENT)
val = NULL;
else if (r < 0)
return log_event_error_errno(dev, token, r, "Failed to get driver: %m");
return token_match_string(token, val);
}
case TK_M_ATTR:
case TK_M_PARENTS_ATTR:
return token_match_attr(token, dev, event);
case TK_M_SYSCTL: {
_cleanup_free_ char *value = NULL;
char buf[UDEV_PATH_SIZE];
bool truncated;
(void) udev_event_apply_format(event, token->data, buf, sizeof(buf), false, &truncated);
if (truncated) {
log_event_truncated(dev, token, "sysctl entry name", token->data, "SYSCTL", /* is_match = */ true);
return false;
}
r = sysctl_read(sysctl_normalize(buf), &value);
if (r < 0 && r != -ENOENT)
return log_event_error_errno(dev, token, r, "Failed to read sysctl '%s': %m", buf);
return token_match_string(token, strstrip(value));
}
case TK_M_TEST: {
mode_t mode = PTR_TO_MODE(token->data);
char buf[UDEV_PATH_SIZE];
struct stat statbuf;
bool match, truncated;
(void) udev_event_apply_format(event, token->value, buf, sizeof(buf), false, &truncated);
if (truncated) {
log_event_truncated(dev, token, "file name", token->value, "TEST", /* is_match = */ true);
return false;
}
if (!path_is_absolute(buf) &&
udev_resolve_subsys_kernel(buf, buf, sizeof(buf), false) < 0) {
char tmp[UDEV_PATH_SIZE];
const char *val;
r = sd_device_get_syspath(dev, &val);
if (r < 0)
return log_event_error_errno(dev, token, r, "Failed to get syspath: %m");
strscpy_full(tmp, sizeof(tmp), buf, &truncated);
assert(!truncated);
strscpyl_full(buf, sizeof(buf), &truncated, val, "/", tmp, NULL);
if (truncated)
return false;
}
r = attr_subst_subdir(buf);
if (r == -ENOENT)
return token->op == OP_NOMATCH;
if (r < 0)
return log_event_error_errno(dev, token, r, "Failed to test for the existence of '%s': %m", buf);
if (stat(buf, &statbuf) < 0)
return token->op == OP_NOMATCH;
if (mode == MODE_INVALID)
return token->op == OP_MATCH;
match = (statbuf.st_mode & mode) > 0;
return token->op == (match ? OP_MATCH : OP_NOMATCH);
}
case TK_M_PROGRAM: {
char buf[UDEV_LINE_SIZE], result[UDEV_LINE_SIZE];
bool truncated;
size_t count;
event->program_result = mfree(event->program_result);
(void) udev_event_apply_format(event, token->value, buf, sizeof(buf), false, &truncated);
if (truncated) {
log_event_truncated(dev, token, "command", token->value, "PROGRAM", /* is_match = */ true);
return false;
}
log_event_debug(dev, token, "Running PROGRAM '%s'", buf);
r = udev_event_spawn(event, /* accept_failure = */ true, buf, result, sizeof(result), NULL);
if (r != 0) {
if (r < 0)
log_event_warning_errno(dev, token, r, "Failed to execute \"%s\": %m", buf);
else /* returned value is positive when program fails */
log_event_debug(dev, token, "Command \"%s\" returned %d (error)", buf, r);
return token->op == OP_NOMATCH;
}
delete_trailing_chars(result, "\n");
count = udev_replace_chars(result, UDEV_ALLOWED_CHARS_INPUT);
if (count > 0)
log_event_debug(dev, token,
"Replaced %zu character(s) in result of \"%s\"",
count, buf);
event->program_result = strdup(result);
return token->op == OP_MATCH;
}
case TK_M_IMPORT_FILE: {
_cleanup_fclose_ FILE *f = NULL;
char buf[UDEV_PATH_SIZE];
bool truncated;
(void) udev_event_apply_format(event, token->value, buf, sizeof(buf), false, &truncated);
if (truncated) {
log_event_truncated(dev, token, "file name to be imported", token->value, "IMPORT", /* is_match = */ true);
return false;
}
log_event_debug(dev, token, "Importing properties from '%s'", buf);
f = fopen(buf, "re");
if (!f) {
if (errno != ENOENT)
return log_event_error_errno(dev, token, errno, "Failed to open '%s': %m", buf);
return token->op == OP_NOMATCH;
}
for (;;) {
_cleanup_free_ char *line = NULL;
char *key, *value;
r = read_line(f, LONG_LINE_MAX, &line);
if (r < 0) {
log_event_debug_errno(dev, token, r, "Failed to read '%s', ignoring: %m", buf);
return token->op == OP_NOMATCH;
}
if (r == 0)
break;
r = get_property_from_string(line, &key, &value);
if (r < 0) {
log_event_debug_errno(dev, token, r,
"Failed to parse key and value from '%s', ignoring: %m",
line);
continue;
}
if (r == 0)
continue;
r = device_add_property(dev, key, value);
if (r < 0)
return log_event_error_errno(dev, token, r,
"Failed to add property %s=%s: %m",
key, value);
}
return token->op == OP_MATCH;
}
case TK_M_IMPORT_PROGRAM: {
_cleanup_strv_free_ char **lines = NULL;
char buf[UDEV_LINE_SIZE], result[UDEV_LINE_SIZE];
bool truncated;
(void) udev_event_apply_format(event, token->value, buf, sizeof(buf), false, &truncated);
if (truncated) {
log_event_truncated(dev, token, "command", token->value, "IMPORT", /* is_match = */ true);
return false;
}
log_event_debug(dev, token, "Importing properties from results of '%s'", buf);
r = udev_event_spawn(event, /* accept_failure = */ true, buf, result, sizeof result, &truncated);
if (r != 0) {
if (r < 0)
log_event_warning_errno(dev, token, r, "Failed to execute '%s', ignoring: %m", buf);
else /* returned value is positive when program fails */
log_event_debug(dev, token, "Command \"%s\" returned %d (error), ignoring", buf, r);
return token->op == OP_NOMATCH;
}
if (truncated) {
bool found = false;
/* Drop the last line. */
for (char *p = PTR_SUB1(buf + strlen(buf), buf); p; p = PTR_SUB1(p, buf))
if (strchr(NEWLINE, *p)) {
*p = '\0';
found = true;
} else if (found)
break;
}
r = strv_split_newlines_full(&lines, result, EXTRACT_RETAIN_ESCAPE);
if (r == -ENOMEM)
return log_oom();
if (r < 0) {
log_event_warning_errno(dev, token, r,
"Failed to extract lines from result of command \"%s\", ignoring: %m", buf);
return false;
}
STRV_FOREACH(line, lines) {
char *key, *value;
r = get_property_from_string(*line, &key, &value);
if (r < 0) {
log_event_debug_errno(dev, token, r,
"Failed to parse key and value from '%s', ignoring: %m",
*line);
continue;
}
if (r == 0)
continue;
r = device_add_property(dev, key, value);
if (r < 0)
return log_event_error_errno(dev, token, r,
"Failed to add property %s=%s: %m",
key, value);
}
return token->op == OP_MATCH;
}
case TK_M_IMPORT_BUILTIN: {
UdevBuiltinCommand cmd = PTR_TO_UDEV_BUILTIN_CMD(token->data);
assert(cmd >= 0 && cmd < _UDEV_BUILTIN_MAX);
unsigned mask = 1U << (int) cmd;
char buf[UDEV_LINE_SIZE];
bool truncated;
if (udev_builtin_run_once(cmd)) {
/* check if we ran already */
if (event->builtin_run & mask) {
log_event_debug(dev, token, "Skipping builtin '%s' in IMPORT key",
udev_builtin_name(cmd));
/* return the result from earlier run */
return token->op == (event->builtin_ret & mask ? OP_NOMATCH : OP_MATCH);
}
/* mark as ran */
event->builtin_run |= mask;
}
(void) udev_event_apply_format(event, token->value, buf, sizeof(buf), false, &truncated);
if (truncated) {
log_event_truncated(dev, token, "builtin command", token->value, "IMPORT", /* is_match = */ true);
return false;
}
log_event_debug(dev, token, "Importing properties from results of builtin command '%s'", buf);
r = udev_builtin_run(event, cmd, buf, false);
if (r < 0) {
/* remember failure */
log_event_debug_errno(dev, token, r, "Failed to run builtin '%s': %m", buf);
event->builtin_ret |= mask;
}
return token->op == (r >= 0 ? OP_MATCH : OP_NOMATCH);
}
case TK_M_IMPORT_DB: {
const char *val;
if (!event->dev_db_clone)
return token->op == OP_NOMATCH;
r = sd_device_get_property_value(event->dev_db_clone, token->value, &val);
if (r == -ENOENT)
return token->op == OP_NOMATCH;
if (r < 0)
return log_event_error_errno(dev, token, r,
"Failed to get property '%s' from database: %m",
token->value);
r = device_add_property(dev, token->value, val);
if (r < 0)
return log_event_error_errno(dev, token, r, "Failed to add property '%s=%s': %m",
token->value, val);
return token->op == OP_MATCH;
}
case TK_M_IMPORT_CMDLINE: {
_cleanup_free_ char *value = NULL;
r = proc_cmdline_get_key(token->value, PROC_CMDLINE_VALUE_OPTIONAL|PROC_CMDLINE_IGNORE_EFI_OPTIONS, &value);
if (r < 0)
return log_event_error_errno(dev, token, r,
"Failed to read '%s' option from /proc/cmdline: %m",
token->value);
if (r == 0)
return token->op == OP_NOMATCH;
r = device_add_property(dev, token->value, value ?: "1");
if (r < 0)
return log_event_error_errno(dev, token, r, "Failed to add property '%s=%s': %m",
token->value, value ?: "1");
return token->op == OP_MATCH;
}
case TK_M_IMPORT_PARENT: {
char buf[UDEV_PATH_SIZE];
bool truncated;
(void) udev_event_apply_format(event, token->value, buf, sizeof(buf), false, &truncated);
if (truncated) {
log_event_truncated(dev, token, "property name", token->value, "IMPORT", /* is_match = */ true);
return false;
}
r = import_parent_into_properties(dev, buf);
if (r < 0)
return log_event_error_errno(dev, token, r,
"Failed to import properties '%s' from parent: %m",
buf);
return token->op == (r > 0 ? OP_MATCH : OP_NOMATCH);
}
case TK_M_RESULT:
return token_match_string(token, event->program_result);
case TK_A_OPTIONS_STRING_ESCAPE_NONE:
event->esc = ESCAPE_NONE;
break;
case TK_A_OPTIONS_STRING_ESCAPE_REPLACE:
event->esc = ESCAPE_REPLACE;
break;
case TK_A_OPTIONS_DB_PERSIST:
device_set_db_persist(dev);
break;
case TK_A_OPTIONS_INOTIFY_WATCH:
if (event->inotify_watch_final)
break;
if (token->op == OP_ASSIGN_FINAL)
event->inotify_watch_final = true;
event->inotify_watch = token->data;
break;
case TK_A_OPTIONS_DEVLINK_PRIORITY:
device_set_devlink_priority(dev, PTR_TO_INT(token->data));
break;
case TK_A_OPTIONS_LOG_LEVEL: {
int level = PTR_TO_INT(token->data);
if (level < 0)
level = event->default_log_level;
log_set_max_level(level);
if (level == LOG_DEBUG && !event->log_level_was_debug) {
/* The log level becomes LOG_DEBUG at first time. Let's log basic information. */
log_device_uevent(dev, "The log level is changed to 'debug' while processing device");
event->log_level_was_debug = true;
}
break;
}
case TK_A_OWNER: {
char owner[UDEV_NAME_SIZE];
const char *ow = owner;
bool truncated;
if (event->owner_final)
break;
if (token->op == OP_ASSIGN_FINAL)
event->owner_final = true;
(void) udev_event_apply_format(event, token->value, owner, sizeof(owner), false, &truncated);
if (truncated) {
log_event_truncated(dev, token, "user name", token->value, "OWNER", /* is_match = */ false);
break;
}
r = get_user_creds(&ow, &event->uid, NULL, NULL, NULL, USER_CREDS_ALLOW_MISSING);
if (r < 0)
log_unknown_owner(dev, token->rule_line, r, "user", owner);
else
log_event_debug(dev, token, "OWNER %s(%u)", owner, event->uid);
break;
}
case TK_A_GROUP: {
char group[UDEV_NAME_SIZE];
const char *gr = group;
bool truncated;
if (event->group_final)
break;
if (token->op == OP_ASSIGN_FINAL)
event->group_final = true;
(void) udev_event_apply_format(event, token->value, group, sizeof(group), false, &truncated);
if (truncated) {
log_event_truncated(dev, token, "group name", token->value, "GROUP", /* is_match = */ false);
break;
}
r = get_group_creds(&gr, &event->gid, USER_CREDS_ALLOW_MISSING);
if (r < 0)
log_unknown_owner(dev, token->rule_line, r, "group", group);
else
log_event_debug(dev, token, "GROUP %s(%u)", group, event->gid);
break;
}
case TK_A_MODE: {
char mode_str[UDEV_NAME_SIZE];
bool truncated;
if (event->mode_final)
break;
if (token->op == OP_ASSIGN_FINAL)
event->mode_final = true;
(void) udev_event_apply_format(event, token->value, mode_str, sizeof(mode_str), false, &truncated);
if (truncated) {
log_event_truncated(dev, token, "mode", token->value, "MODE", /* is_match = */ false);
break;
}
r = parse_mode(mode_str, &event->mode);
if (r < 0)
log_event_error_errno(dev, token, r, "Failed to parse mode '%s', ignoring: %m", mode_str);
else
log_event_debug(dev, token, "MODE %#o", event->mode);
break;
}
case TK_A_OWNER_ID:
if (event->owner_final)
break;
if (token->op == OP_ASSIGN_FINAL)
event->owner_final = true;
if (!token->data)
break;
event->uid = PTR_TO_UID(token->data);
log_event_debug(dev, token, "OWNER %u", event->uid);
break;
case TK_A_GROUP_ID:
if (event->group_final)
break;
if (token->op == OP_ASSIGN_FINAL)
event->group_final = true;
if (!token->data)
break;
event->gid = PTR_TO_GID(token->data);
log_event_debug(dev, token, "GROUP %u", event->gid);
break;
case TK_A_MODE_ID:
if (event->mode_final)
break;
if (token->op == OP_ASSIGN_FINAL)
event->mode_final = true;
if (!token->data)
break;
event->mode = PTR_TO_MODE(token->data);
log_event_debug(dev, token, "MODE %#o", event->mode);
break;
case TK_A_SECLABEL: {
_cleanup_free_ char *name = NULL, *label = NULL;
char label_str[UDEV_LINE_SIZE] = {};
bool truncated;
name = strdup(token->data);
if (!name)
return log_oom();
(void) udev_event_apply_format(event, token->value, label_str, sizeof(label_str), false, &truncated);
if (truncated) {
log_event_truncated(dev, token, "security label", token->value, "SECLABEL", /* is_match = */ false);
break;
}
if (!isempty(label_str))
label = strdup(label_str);
else
label = strdup(token->value);
if (!label)
return log_oom();
if (token->op == OP_ASSIGN)
ordered_hashmap_clear_free_free(event->seclabel_list);
r = ordered_hashmap_ensure_put(&event->seclabel_list, NULL, name, label);
if (r == -ENOMEM)
return log_oom();
if (r < 0)
return log_event_error_errno(dev, token, r, "Failed to store SECLABEL{%s}='%s': %m", name, label);
log_event_debug(dev, token, "SECLABEL{%s}='%s'", name, label);
TAKE_PTR(name);
TAKE_PTR(label);
break;
}
case TK_A_ENV: {
const char *val, *name = token->data;
char value_new[UDEV_NAME_SIZE], *p = value_new;
size_t count, l = sizeof(value_new);
bool truncated;
if (isempty(token->value)) {
if (token->op == OP_ADD)
break;
r = device_add_property(dev, name, NULL);
if (r < 0)
return log_event_error_errno(dev, token, r, "Failed to remove property '%s': %m", name);
break;
}
if (token->op == OP_ADD &&
device_get_property_value_with_fallback(dev, name, event->worker ? event->worker->properties : NULL, &val) >= 0) {
l = strpcpyl_full(&p, l, &truncated, val, " ", NULL);
if (truncated) {
log_event_warning(dev, token,
"The buffer for the property '%s' is full, "
"refusing to append the new value '%s'.", name, token->value);
break;
}
}
(void) udev_event_apply_format(event, token->value, p, l, false, &truncated);
if (truncated) {
_cleanup_free_ char *key_with_name = strjoin("ENV{", name, "}");
log_event_truncated(dev, token, "property value", token->value,
key_with_name ?: "ENV", /* is_match = */ false);
break;
}
if (event->esc == ESCAPE_REPLACE) {
count = udev_replace_chars(p, NULL);
if (count > 0)
log_event_debug(dev, token,
"Replaced %zu slash(es) from result of ENV{%s}%s=\"%s\"",
count, name, token->op == OP_ADD ? "+" : "", token->value);
}
r = device_add_property(dev, name, value_new);
if (r < 0)
return log_event_error_errno(dev, token, r, "Failed to add property '%s=%s': %m", name, value_new);
break;
}
case TK_A_TAG: {
char buf[UDEV_PATH_SIZE];
bool truncated;
(void) udev_event_apply_format(event, token->value, buf, sizeof(buf), false, &truncated);
if (truncated) {
log_event_truncated(dev, token, "tag name", token->value, "TAG", /* is_match = */ false);
break;
}
if (token->op == OP_ASSIGN)
device_cleanup_tags(dev);
if (token->op == OP_REMOVE)
device_remove_tag(dev, buf);
else {
r = device_add_tag(dev, buf, true);
if (r == -ENOMEM)
return log_oom();
if (r < 0)
log_event_warning_errno(dev, token, r, "Failed to add tag '%s', ignoring: %m", buf);
}
break;
}
case TK_A_NAME: {
char buf[UDEV_PATH_SIZE];
bool truncated;
size_t count;
if (event->name_final)
break;
if (token->op == OP_ASSIGN_FINAL)
event->name_final = true;
if (sd_device_get_ifindex(dev, NULL) < 0) {
log_event_error(dev, token,
"Only network interfaces can be renamed, ignoring NAME=\"%s\".",
token->value);
break;
}
(void) udev_event_apply_format(event, token->value, buf, sizeof(buf), false, &truncated);
if (truncated) {
log_event_truncated(dev, token, "network interface name", token->value, "NAME", /* is_match = */ false);
break;
}
if (IN_SET(event->esc, ESCAPE_UNSET, ESCAPE_REPLACE)) {
if (naming_scheme_has(NAMING_REPLACE_STRICTLY))
count = udev_replace_ifname(buf);
else
count = udev_replace_chars(buf, "/");
if (count > 0)
log_event_debug(dev, token,
"Replaced %zu character(s) from result of NAME=\"%s\"",
count, token->value);
}
r = free_and_strdup_warn(&event->name, buf);
if (r < 0)
return r;
log_event_debug(dev, token, "NAME '%s'", event->name);
break;
}
case TK_A_DEVLINK: {
char buf[UDEV_PATH_SIZE];
bool truncated;
size_t count;
if (event->devlink_final)
break;
if (sd_device_get_devnum(dev, NULL) < 0)
break;
if (token->op == OP_ASSIGN_FINAL)
event->devlink_final = true;
if (IN_SET(token->op, OP_ASSIGN, OP_ASSIGN_FINAL))
device_cleanup_devlinks(dev);
(void) udev_event_apply_format(event, token->value, buf, sizeof(buf),
/* replace_whitespace = */ event->esc != ESCAPE_NONE, &truncated);
if (truncated) {
log_event_truncated(dev, token, "symbolic link path", token->value, "SYMLINK", /* is_match = */ false);
break;
}
/* By default or string_escape=none, allow multiple symlinks separated by spaces. */
if (event->esc == ESCAPE_UNSET)
count = udev_replace_chars(buf, /* allow = */ "/ ");
else if (event->esc == ESCAPE_REPLACE)
count = udev_replace_chars(buf, /* allow = */ "/");
else
count = 0;
if (count > 0)
log_event_debug(dev, token,
"Replaced %zu character(s) from result of SYMLINK=\"%s\"",
count, token->value);
for (const char *p = buf;;) {
_cleanup_free_ char *path = NULL;
r = extract_first_word(&p, &path, NULL, EXTRACT_RETAIN_ESCAPE);
if (r == -ENOMEM)
return log_oom();
if (r < 0) {
log_warning_errno(r, "Failed to extract first path in SYMLINK=, ignoring: %m");
break;
}
if (r == 0)
break;
if (token->op == OP_REMOVE) {
r = device_remove_devlink(dev, path);
if (r == -ENOMEM)
return log_oom();
if (r < 0)
log_event_warning_errno(dev, token, r, "Failed to remove devlink '%s', ignoring: %m", path);
else if (r > 0)
log_event_debug(dev, token, "Dropped SYMLINK '%s'", path);
} else {
r = device_add_devlink(dev, path);
if (r == -ENOMEM)
return log_oom();
if (r < 0)
log_event_warning_errno(dev, token, r, "Failed to add devlink '%s', ignoring: %m", path);
else if (r > 0)
log_event_debug(dev, token, "Added SYMLINK '%s'", path);
}
}
break;
}
case TK_A_ATTR: {
char buf[UDEV_PATH_SIZE], value[UDEV_NAME_SIZE];
const char *val, *key_name = token->data;
bool truncated;
if (udev_resolve_subsys_kernel(key_name, buf, sizeof(buf), false) < 0 &&
sd_device_get_syspath(dev, &val) >= 0) {
strscpyl_full(buf, sizeof(buf), &truncated, val, "/", key_name, NULL);
if (truncated) {
log_event_warning(dev, token,
"The path to the attribute '%s/%s' is too long, refusing to set the attribute.",
val, key_name);
break;
}
}
r = attr_subst_subdir(buf);
if (r < 0) {
log_event_error_errno(dev, token, r, "Could not find file matches '%s', ignoring: %m", buf);
break;
}
(void) udev_event_apply_format(event, token->value, value, sizeof(value), false, &truncated);
if (truncated) {
log_event_truncated(dev, token, "attribute value", token->value, "ATTR", /* is_match = */ false);
break;
}
log_event_debug(dev, token, "ATTR '%s' writing '%s'", buf, value);
r = write_string_file(buf, value,
WRITE_STRING_FILE_VERIFY_ON_FAILURE |
WRITE_STRING_FILE_DISABLE_BUFFER |
WRITE_STRING_FILE_AVOID_NEWLINE |
WRITE_STRING_FILE_VERIFY_IGNORE_NEWLINE);
if (r < 0)
log_event_error_errno(dev, token, r, "Failed to write ATTR{%s}, ignoring: %m", buf);
break;
}
case TK_A_SYSCTL: {
char buf[UDEV_PATH_SIZE], value[UDEV_NAME_SIZE];
bool truncated;
(void) udev_event_apply_format(event, token->data, buf, sizeof(buf), false, &truncated);
if (truncated) {
log_event_truncated(dev, token, "sysctl entry name", token->data, "SYSCTL", /* is_match = */ false);
break;
}
(void) udev_event_apply_format(event, token->value, value, sizeof(value), false, &truncated);
if (truncated) {
_cleanup_free_ char *key_with_name = strjoin("SYSCTL{", buf, "}");
log_event_truncated(dev, token, "sysctl value", token->value,
key_with_name ?: "SYSCTL", /* is_match = */ false);
break;
}
sysctl_normalize(buf);
log_event_debug(dev, token, "SYSCTL '%s' writing '%s'", buf, value);
r = sysctl_write(buf, value);
if (r < 0)
log_event_error_errno(dev, token, r, "Failed to write SYSCTL{%s}='%s', ignoring: %m", buf, value);
break;
}
case TK_A_RUN_BUILTIN:
case TK_A_RUN_PROGRAM: {
_cleanup_free_ char *cmd = NULL;
char buf[UDEV_LINE_SIZE];
bool truncated;
if (event->run_final)
break;
if (token->op == OP_ASSIGN_FINAL)
event->run_final = true;
if (IN_SET(token->op, OP_ASSIGN, OP_ASSIGN_FINAL))
ordered_hashmap_clear_free_key(event->run_list);
(void) udev_event_apply_format(event, token->value, buf, sizeof(buf), false, &truncated);
if (truncated) {
log_event_truncated(dev, token, "command", token->value,
token->type == TK_A_RUN_BUILTIN ? "RUN{builtin}" : "RUN{program}",
/* is_match = */ false);
break;
}
cmd = strdup(buf);
if (!cmd)
return log_oom();
r = ordered_hashmap_ensure_put(&event->run_list, NULL, cmd, token->data);
if (r == -ENOMEM)
return log_oom();
if (r < 0)
return log_event_error_errno(dev, token, r, "Failed to store command '%s': %m", cmd);
TAKE_PTR(cmd);
log_event_debug(dev, token, "RUN '%s'", token->value);
break;
}
case TK_A_OPTIONS_STATIC_NODE:
/* do nothing for events. */
break;
default:
assert_not_reached();
}
return true;
}
static bool token_is_for_parents(UdevRuleToken *token) {
return token->type >= TK_M_PARENTS_KERNEL && token->type <= TK_M_PARENTS_TAG;
}
static int udev_rule_apply_parent_token_to_event(UdevRuleToken *head_token, UdevEvent *event) {
int r;
assert(head_token);
assert(event);
event->dev_parent = ASSERT_PTR(event->dev);
for (;;) {
LIST_FOREACH(tokens, token, head_token) {
if (!token_is_for_parents(token))
return true; /* All parent tokens match. */
r = udev_rule_apply_token_to_event(token, event->dev_parent, event);
if (r < 0)
return r;
if (r == 0)
break;
}
if (r > 0)
/* All parent tokens match, and no more token (except for GOTO) in the line. */
return true;
if (sd_device_get_parent(event->dev_parent, &event->dev_parent) < 0) {
event->dev_parent = NULL;
return false;
}
}
}
static int udev_rule_apply_line_to_event(
UdevRuleLine *line,
UdevEvent *event,
UdevRuleLine **next_line) {
UdevRuleLineType mask = LINE_HAS_GOTO | LINE_UPDATE_SOMETHING;
bool parents_done = false;
sd_device_action_t action;
int r;
assert(line);
assert(event);
assert(next_line);
r = sd_device_get_action(event->dev, &action);
if (r < 0)
return r;
if (action != SD_DEVICE_REMOVE) {
if (sd_device_get_devnum(event->dev, NULL) >= 0)
mask |= LINE_HAS_DEVLINK;
if (sd_device_get_ifindex(event->dev, NULL) >= 0)
mask |= LINE_HAS_NAME;
}
if ((line->type & mask) == 0)
return 0;
event->esc = ESCAPE_UNSET;
DEVICE_TRACE_POINT(rules_apply_line, event->dev, line->rule_file->filename, line->line_number);
LIST_FOREACH(tokens, token, line->tokens) {
if (token_is_for_parents(token)) {
if (parents_done)
continue;
r = udev_rule_apply_parent_token_to_event(token, event);
if (r <= 0)
return r;
parents_done = true;
continue;
}
r = udev_rule_apply_token_to_event(token, event->dev, event);
if (r <= 0)
return r;
}
if (line->goto_line)
*next_line = line->goto_line; /* update next_line only when the line has GOTO token. */
return 0;
}
int udev_rules_apply_to_event(UdevRules *rules, UdevEvent *event) {
int r;
assert(rules);
assert(event);
LIST_FOREACH(rule_files, file, rules->rule_files)
LIST_FOREACH_WITH_NEXT(rule_lines, line, next_line, file->rule_lines) {
r = udev_rule_apply_line_to_event(line, event, &next_line);
if (r < 0)
return r;
}
return 0;
}
static int udev_rule_line_apply_static_dev_perms(UdevRuleLine *rule_line) {
_cleanup_strv_free_ char **tags = NULL;
uid_t uid = UID_INVALID;
gid_t gid = GID_INVALID;
mode_t mode = MODE_INVALID;
int r;
assert(rule_line);
if (!FLAGS_SET(rule_line->type, LINE_HAS_STATIC_NODE))
return 0;
LIST_FOREACH(tokens, token, rule_line->tokens)
if (token->type == TK_A_OWNER_ID)
uid = PTR_TO_UID(token->data);
else if (token->type == TK_A_GROUP_ID)
gid = PTR_TO_GID(token->data);
else if (token->type == TK_A_MODE_ID)
mode = PTR_TO_MODE(token->data);
else if (token->type == TK_A_TAG) {
r = strv_extend(&tags, token->value);
if (r < 0)
return log_oom();
} else if (token->type == TK_A_OPTIONS_STATIC_NODE) {
r = static_node_apply_permissions(token->value, mode, uid, gid, tags);
if (r < 0)
return r;
}
return 0;
}
int udev_rules_apply_static_dev_perms(UdevRules *rules) {
int r;
assert(rules);
LIST_FOREACH(rule_files, file, rules->rule_files)
LIST_FOREACH(rule_lines, line, file->rule_lines) {
r = udev_rule_line_apply_static_dev_perms(line);
if (r < 0)
return r;
}
return 0;
}
static const char* const resolve_name_timing_table[_RESOLVE_NAME_TIMING_MAX] = {
[RESOLVE_NAME_NEVER] = "never",
[RESOLVE_NAME_LATE] = "late",
[RESOLVE_NAME_EARLY] = "early",
};
DEFINE_STRING_TABLE_LOOKUP(resolve_name_timing, ResolveNameTiming);
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