/* SPDX-License-Identifier: GPL-2.0-or-later */ #include #include "alloc-util.h" #include "architecture.h" #include "conf-files.h" #include "conf-parser.h" #include "constants.h" #include "device-private.h" #include "device-util.h" #include "dirent-util.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 "stat-util.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-node.h" #include "udev-rules.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, /* "[/]" 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 (STR_IN_SET(attr, "ACTION", "DEVLINKS", "DEVNAME", "DEVPATH", "DEVTYPE", "DRIVER", "IFINDEX", "MAJOR", "MINOR", "SEQNUM", "SUBSYSTEM", "TAGS")) 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_warning(rule_line, "Stray leading comma."); } else if (isempty(p)) { /* there are no more tokens in the rule */ if (n_comma > 0) log_line_warning(rule_line, "Stray trailing comma."); } else { /* single comma is expected */ if (n_comma == 0) log_line_warning(rule_line, "A comma between tokens is expected."); else if (n_comma > 1) log_line_warning(rule_line, "More than one comma between tokens."); /* whitespace after comma is expected */ if (n_comma > 0) { if (ws_before_comma) log_line_warning(rule_line, "Stray whitespace before comma."); if (!ws_after_comma) log_line_warning(rule_line, "Whitespace after comma is expected."); } else if (!ws_before_comma && !ws_after_comma) log_line_warning(rule_line, "Whitespace between tokens is expected."); } } 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_notice(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_warning(line, "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 && 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) { const char *key, *val; 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 int udev_rule_apply_token_to_event( UdevRuleToken *token, sd_device *dev, UdevEvent *event, usec_t timeout_usec, int timeout_signal, Hashmap *properties_list) { 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: { const char *val; 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; if (sd_device_get_property_value(dev, token->data, &val) < 0) val = hashmap_get(properties_list, token->data); 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 assert_not_reached(); return token_match_string(token, val); } case TK_M_TAG: case TK_M_PARENTS_TAG: { const char *val; 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, timeout_usec, timeout_signal, 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, timeout_usec, timeout_signal, 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 && sd_device_get_property_value(dev, name, &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 timeout_signal) { 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, 0, timeout_signal, NULL); 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, usec_t timeout_usec, int timeout_signal, Hashmap *properties_list, 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, timeout_signal); if (r <= 0) return r; parents_done = true; continue; } r = udev_rule_apply_token_to_event(token, event->dev, event, timeout_usec, timeout_signal, properties_list); 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, usec_t timeout_usec, int timeout_signal, Hashmap *properties_list) { 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, timeout_usec, timeout_signal, properties_list, &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; }