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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 13:00:47 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 13:00:47 +0000 |
| commit | 2cb7e0aaedad73b076ea18c6900b0e86c5760d79 (patch) | |
| tree | da68ca54bb79f4080079bf0828acda937593a4e1 /src/udev/udev-rules.c | |
| parent | Initial commit. (diff) | |
| download | systemd-2cb7e0aaedad73b076ea18c6900b0e86c5760d79.tar.xz systemd-2cb7e0aaedad73b076ea18c6900b0e86c5760d79.zip | |
Adding upstream version 247.3.upstream/247.3upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/udev/udev-rules.c')
| -rw-r--r-- | src/udev/udev-rules.c | 2393 |
1 files changed, 2393 insertions, 0 deletions
diff --git a/src/udev/udev-rules.c b/src/udev/udev-rules.c new file mode 100644 index 0000000..ef6a0c1 --- /dev/null +++ b/src/udev/udev-rules.c @@ -0,0 +1,2393 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ + +#include <ctype.h> + +#include "alloc-util.h" +#include "architecture.h" +#include "conf-files.h" +#include "def.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 "libudev-util.h" +#include "list.h" +#include "mkdir.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 "udev-builtin.h" +#include "udev-event.h" +#include "udev-rules.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 = -1 +} 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 = -1 +} 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 = -1 +} 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(), util_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_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 = -1, +} 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 */ +} 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; + 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; + UdevRuleToken *current_token; + LIST_HEAD(UdevRuleToken, tokens); + LIST_FIELDS(UdevRuleLine, rule_lines); +}; + +struct UdevRuleFile { + char *filename; + UdevRuleLine *current_line; + LIST_HEAD(UdevRuleLine, rule_lines); + LIST_FIELDS(UdevRuleFile, rule_files); +}; + +struct UdevRules { + usec_t dirs_ts_usec; + ResolveNameTiming resolve_name_timing; + Hashmap *known_users; + Hashmap *known_groups; + UdevRuleFile *current_file; + LIST_HEAD(UdevRuleFile, rule_files); +}; + +/*** Logging helpers ***/ + +#define log_rule_full_errno(device, rules, level, error, fmt, ...) \ + ({ \ + UdevRules *_r = (rules); \ + UdevRuleFile *_f = _r ? _r->current_file : NULL; \ + UdevRuleLine *_l = _f ? _f->current_line : NULL; \ + const char *_n = _f ? _f->filename : NULL; \ + \ + log_device_full_errno(device, level, error, "%s:%u " fmt, \ + strna(_n), _l ? _l->line_number : 0, \ + ##__VA_ARGS__); \ + }) + +#define log_rule_full(device, rules, level, ...) (void) log_rule_full_errno(device, rules, level, 0, __VA_ARGS__) + +#define log_rule_debug(device, rules, ...) log_rule_full_errno(device, rules, LOG_DEBUG, 0, __VA_ARGS__) +#define log_rule_info(device, rules, ...) log_rule_full(device, rules, LOG_INFO, __VA_ARGS__) +#define log_rule_notice(device, rules, ...) log_rule_full(device, rules, LOG_NOTICE, __VA_ARGS__) +#define log_rule_warning(device, rules, ...) log_rule_full(device, rules, LOG_WARNING, __VA_ARGS__) +#define log_rule_error(device, rules, ...) log_rule_full(device, rules, LOG_ERR, __VA_ARGS__) + +#define log_rule_debug_errno(device, rules, error, ...) log_rule_full_errno(device, rules, LOG_DEBUG, error, __VA_ARGS__) +#define log_rule_info_errno(device, rules, error, ...) log_rule_full_errno(device, rules, LOG_INFO, error, __VA_ARGS__) +#define log_rule_notice_errno(device, rules, error, ...) log_rule_full_errno(device, rules, LOG_NOTICE, error, __VA_ARGS__) +#define log_rule_warning_errno(device, rules, error, ...) log_rule_full_errno(device, rules, LOG_WARNING, error, __VA_ARGS__) +#define log_rule_error_errno(device, rules, error, ...) log_rule_full_errno(device, rules, LOG_ERR, error, __VA_ARGS__) + +#define log_token_full_errno(rules, level, error, ...) log_rule_full_errno(NULL, rules, level, error, __VA_ARGS__) +#define log_token_full(rules, level, ...) (void) log_token_full_errno(rules, level, 0, __VA_ARGS__) + +#define log_token_debug(rules, ...) log_token_full_errno(rules, LOG_DEBUG, 0, __VA_ARGS__) +#define log_token_info(rules, ...) log_token_full(rules, LOG_INFO, __VA_ARGS__) +#define log_token_notice(rules, ...) log_token_full(rules, LOG_NOTICE, __VA_ARGS__) +#define log_token_warning(rules, ...) log_token_full(rules, LOG_WARNING, __VA_ARGS__) +#define log_token_error(rules, ...) log_token_full(rules, LOG_ERR, __VA_ARGS__) + +#define log_token_debug_errno(rules, error, ...) log_token_full_errno(rules, LOG_DEBUG, error, __VA_ARGS__) +#define log_token_info_errno(rules, error, ...) log_token_full_errno(rules, LOG_INFO, error, __VA_ARGS__) +#define log_token_notice_errno(rules, error, ...) log_token_full_errno(rules, LOG_NOTICE, error, __VA_ARGS__) +#define log_token_warning_errno(rules, error, ...) log_token_full_errno(rules, LOG_WARNING, error, __VA_ARGS__) +#define log_token_error_errno(rules, error, ...) log_token_full_errno(rules, LOG_ERR, error, __VA_ARGS__) + +#define _log_token_invalid(rules, key, type) \ + log_token_error_errno(rules, SYNTHETIC_ERRNO(EINVAL), \ + "Invalid %s for %s.", type, key) + +#define log_token_invalid_op(rules, key) _log_token_invalid(rules, key, "operator") +#define log_token_invalid_attr(rules, key) _log_token_invalid(rules, key, "attribute") + +#define log_token_invalid_attr_format(rules, key, attr, offset, hint) \ + log_token_error_errno(rules, SYNTHETIC_ERRNO(EINVAL), \ + "Invalid attribute \"%s\" for %s (char %zu: %s), ignoring, but please fix it.", \ + attr, key, offset, hint) +#define log_token_invalid_value(rules, key, value, offset, hint) \ + log_token_error_errno(rules, SYNTHETIC_ERRNO(EINVAL), \ + "Invalid value \"%s\" for %s (char %zu: %s), ignoring, but please fix it.", \ + value, key, offset, hint) + +static void log_unknown_owner(sd_device *dev, UdevRules *rules, int error, const char *entity, const char *name) { + if (IN_SET(abs(error), ENOENT, ESRCH)) + log_rule_error(dev, rules, "Unknown %s '%s', ignoring", entity, name); + else + log_rule_error_errno(dev, rules, error, "Failed to resolve %s '%s', ignoring: %m", entity, name); +} + +/*** Other functions ***/ + +static void udev_rule_token_free(UdevRuleToken *token) { + free(token); +} + +static void udev_rule_line_clear_tokens(UdevRuleLine *rule_line) { + UdevRuleToken *i, *next; + + assert(rule_line); + + LIST_FOREACH_SAFE(tokens, i, next, rule_line->tokens) + udev_rule_token_free(i); + + rule_line->tokens = NULL; +} + +static void udev_rule_line_free(UdevRuleLine *rule_line) { + if (!rule_line) + return; + + udev_rule_line_clear_tokens(rule_line); + + if (rule_line->rule_file) { + if (rule_line->rule_file->current_line == rule_line) + rule_line->rule_file->current_line = rule_line->rule_lines_prev; + + LIST_REMOVE(rule_lines, rule_line->rule_file->rule_lines, rule_line); + } + + free(rule_line->line); + free(rule_line); +} + +DEFINE_TRIVIAL_CLEANUP_FUNC(UdevRuleLine*, udev_rule_line_free); + +static void udev_rule_file_free(UdevRuleFile *rule_file) { + UdevRuleLine *i, *next; + + if (!rule_file) + return; + + LIST_FOREACH_SAFE(rule_lines, i, next, rule_file->rule_lines) + udev_rule_line_free(i); + + free(rule_file->filename); + free(rule_file); +} + +UdevRules *udev_rules_free(UdevRules *rules) { + UdevRuleFile *i, *next; + + if (!rules) + return NULL; + + LIST_FOREACH_SAFE(rule_files, i, next, rules->rule_files) + udev_rule_file_free(i); + + hashmap_free_free_key(rules->known_users); + hashmap_free_free_key(rules->known_groups); + return mfree(rules); +} + +static int rule_resolve_user(UdevRules *rules, const char *name, uid_t *ret) { + _cleanup_free_ char *n = NULL; + uid_t uid; + void *val; + int r; + + assert(rules); + assert(name); + + val = hashmap_get(rules->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, rules, r, "user", name); + *ret = UID_INVALID; + return 0; + } + + n = strdup(name); + if (!n) + return -ENOMEM; + + r = hashmap_ensure_allocated(&rules->known_users, &string_hash_ops); + if (r < 0) + return r; + + r = hashmap_put(rules->known_users, n, UID_TO_PTR(uid)); + if (r < 0) + return r; + + TAKE_PTR(n); + *ret = uid; + return 0; +} + +static int rule_resolve_group(UdevRules *rules, const char *name, gid_t *ret) { + _cleanup_free_ char *n = NULL; + gid_t gid; + void *val; + int r; + + assert(rules); + assert(name); + + val = hashmap_get(rules->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, rules, r, "group", name); + *ret = GID_INVALID; + return 0; + } + + n = strdup(name); + if (!n) + return -ENOMEM; + + r = hashmap_ensure_allocated(&rules->known_groups, &string_hash_ops); + if (r < 0) + return r; + + r = hashmap_put(rules->known_groups, 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 void rule_line_append_token(UdevRuleLine *rule_line, UdevRuleToken *token) { + assert(rule_line); + assert(token); + + if (rule_line->current_token) + LIST_APPEND(tokens, rule_line->current_token, token); + else + LIST_APPEND(tokens, rule_line->tokens, token); + + rule_line->current_token = token; +} + +static int rule_line_add_token(UdevRuleLine *rule_line, UdevRuleTokenType type, UdevRuleOperatorType op, char *value, void *data) { + UdevRuleToken *token; + 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 < TK_M_TEST || type == TK_M_RESULT) { + /* 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_append_token(rule_line, 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); + + return 0; +} + +static void check_value_format_and_warn(UdevRules *rules, const char *key, const char *value, bool nonempty) { + size_t offset; + const char *hint; + + if (nonempty && isempty(value)) + log_token_invalid_value(rules, key, value, (size_t) 0, "empty value"); + else if (udev_check_format(value, &offset, &hint) < 0) + log_token_invalid_value(rules, key, value, offset + 1, hint); +} + +static int check_attr_format_and_warn(UdevRules *rules, const char *key, const char *value) { + size_t offset; + const char *hint; + + if (isempty(value)) + return log_token_invalid_attr(rules, key); + if (udev_check_format(value, &offset, &hint) < 0) + log_token_invalid_attr_format(rules, key, value, offset + 1, hint); + return 0; +} + +static int parse_token(UdevRules *rules, const char *key, char *attr, UdevRuleOperatorType op, char *value) { + bool is_match = IN_SET(op, OP_MATCH, OP_NOMATCH); + UdevRuleLine *rule_line; + int r; + + assert(rules); + assert(rules->current_file); + assert(rules->current_file->current_line); + assert(key); + assert(value); + + rule_line = rules->current_file->current_line; + + if (streq(key, "ACTION")) { + if (attr) + return log_token_invalid_attr(rules, key); + if (!is_match) + return log_token_invalid_op(rules, key); + + r = rule_line_add_token(rule_line, TK_M_ACTION, op, value, NULL); + } else if (streq(key, "DEVPATH")) { + if (attr) + return log_token_invalid_attr(rules, key); + if (!is_match) + return log_token_invalid_op(rules, key); + + r = rule_line_add_token(rule_line, TK_M_DEVPATH, op, value, NULL); + } else if (streq(key, "KERNEL")) { + if (attr) + return log_token_invalid_attr(rules, key); + if (!is_match) + return log_token_invalid_op(rules, key); + + r = rule_line_add_token(rule_line, TK_M_KERNEL, op, value, NULL); + } else if (streq(key, "SYMLINK")) { + if (attr) + return log_token_invalid_attr(rules, key); + if (op == OP_REMOVE) + return log_token_invalid_op(rules, key); + + if (!is_match) { + check_value_format_and_warn(rules, 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_token_invalid_attr(rules, key); + if (op == OP_REMOVE) + return log_token_invalid_op(rules, key); + if (op == OP_ADD) { + log_token_warning(rules, "%s key takes '==', '!=', '=', or ':=' operator, assuming '=', but please fix it.", key); + op = OP_ASSIGN; + } + + if (!is_match) { + if (streq(value, "%k")) + return log_token_error_errno(rules, SYNTHETIC_ERRNO(EINVAL), + "NAME=\"%%k\" is ignored, as it breaks kernel supplied names."); + if (isempty(value)) + return log_token_error_errno(rules, SYNTHETIC_ERRNO(EINVAL), + "Ignoring NAME=\"\", as udev will not delete any device nodes."); + check_value_format_and_warn(rules, 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_token_invalid_attr(rules, key); + if (op == OP_REMOVE) + return log_token_invalid_op(rules, key); + if (op == OP_ASSIGN_FINAL) { + log_token_warning(rules, "%s key takes '==', '!=', '=', or '+=' operator, assuming '=', but please fix it.", 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_token_error_errno(rules, SYNTHETIC_ERRNO(EINVAL), + "Invalid ENV attribute. '%s' cannot be set.", attr); + + check_value_format_and_warn(rules, 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_token_invalid_attr(rules, key); + if (!is_match) + return log_token_invalid_op(rules, key); + r = rule_line_add_token(rule_line, TK_M_CONST, op, value, attr); + } else if (streq(key, "TAG")) { + if (attr) + return log_token_invalid_attr(rules, key); + if (op == OP_ASSIGN_FINAL) { + log_token_warning(rules, "%s key takes '==', '!=', '=', or '+=' operator, assuming '=', but please fix it.", key); + op = OP_ASSIGN; + } + + if (!is_match) { + check_value_format_and_warn(rules, 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_token_invalid_attr(rules, key); + if (!is_match) + return log_token_invalid_op(rules, key); + + if (STR_IN_SET(value, "bus", "class")) + log_token_warning(rules, "'%s' must be specified as 'subsystem'; please fix it", value); + + r = rule_line_add_token(rule_line, TK_M_SUBSYSTEM, op, value, NULL); + } else if (streq(key, "DRIVER")) { + if (attr) + return log_token_invalid_attr(rules, key); + if (!is_match) + return log_token_invalid_op(rules, 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(rules, key, attr); + if (r < 0) + return r; + if (op == OP_REMOVE) + return log_token_invalid_op(rules, key); + if (IN_SET(op, OP_ADD, OP_ASSIGN_FINAL)) { + log_token_warning(rules, "%s key takes '==', '!=', or '=' operator, assuming '=', but please fix it.", key); + op = OP_ASSIGN; + } + + if (!is_match) { + check_value_format_and_warn(rules, 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(rules, key, attr); + if (r < 0) + return r; + if (op == OP_REMOVE) + return log_token_invalid_op(rules, key); + if (IN_SET(op, OP_ADD, OP_ASSIGN_FINAL)) { + log_token_warning(rules, "%s key takes '==', '!=', or '=' operator, assuming '=', but please fix it.", key); + op = OP_ASSIGN; + } + + if (!is_match) { + check_value_format_and_warn(rules, 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_token_invalid_attr(rules, key); + if (!is_match) + return log_token_invalid_op(rules, key); + + r = rule_line_add_token(rule_line, TK_M_PARENTS_KERNEL, op, value, NULL); + } else if (streq(key, "SUBSYSTEMS")) { + if (attr) + return log_token_invalid_attr(rules, key); + if (!is_match) + return log_token_invalid_op(rules, key); + + r = rule_line_add_token(rule_line, TK_M_PARENTS_SUBSYSTEM, op, value, NULL); + } else if (streq(key, "DRIVERS")) { + if (attr) + return log_token_invalid_attr(rules, key); + if (!is_match) + return log_token_invalid_op(rules, 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(rules, key, attr); + if (r < 0) + return r; + if (!is_match) + return log_token_invalid_op(rules, key); + + if (startswith(attr, "device/")) + log_token_warning(rules, "'device' link may not be available in future kernels; please fix it."); + if (strstr(attr, "../")) + log_token_warning(rules, "Direct reference to parent sysfs directory, may break in future kernels; please fix it."); + + r = rule_line_add_token(rule_line, TK_M_PARENTS_ATTR, op, value, attr); + } else if (streq(key, "TAGS")) { + if (attr) + return log_token_invalid_attr(rules, key); + if (!is_match) + return log_token_invalid_op(rules, 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_token_error_errno(rules, r, "Failed to parse mode '%s': %m", attr); + } + check_value_format_and_warn(rules, key, value, true); + if (!is_match) + return log_token_invalid_op(rules, 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_token_invalid_attr(rules, key); + check_value_format_and_warn(rules, key, value, true); + if (op == OP_REMOVE) + return log_token_invalid_op(rules, 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_token_invalid_attr(rules, key); + check_value_format_and_warn(rules, key, value, true); + if (op == OP_REMOVE) + return log_token_invalid_op(rules, 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_token_debug(rules,"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_token_error_errno(rules, 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_token_invalid_attr(rules, key); + } else if (streq(key, "RESULT")) { + if (attr) + return log_token_invalid_attr(rules, key); + if (!is_match) + return log_token_invalid_op(rules, 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_token_invalid_attr(rules, key); + if (is_match || op == OP_REMOVE) + return log_token_invalid_op(rules, 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_token_error_errno(rules, 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 { + log_token_warning(rules, "Invalid value for OPTIONS key, ignoring: '%s'", value); + return 0; + } + } else if (streq(key, "OWNER")) { + uid_t uid; + + if (attr) + return log_token_invalid_attr(rules, key); + if (is_match || op == OP_REMOVE) + return log_token_invalid_op(rules, key); + if (op == OP_ADD) { + log_token_warning(rules, "%s key takes '=' or ':=' operator, assuming '=', but please fix it.", 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 (rules->resolve_name_timing == RESOLVE_NAME_EARLY && + rule_get_substitution_type(value) == SUBST_TYPE_PLAIN) { + r = rule_resolve_user(rules, value, &uid); + if (r < 0) + return log_token_error_errno(rules, 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 (rules->resolve_name_timing != RESOLVE_NAME_NEVER) { + check_value_format_and_warn(rules, key, value, true); + r = rule_line_add_token(rule_line, TK_A_OWNER, op, value, NULL); + } else { + log_token_debug(rules, "User name resolution is disabled, ignoring %s=%s", key, value); + return 0; + } + } else if (streq(key, "GROUP")) { + gid_t gid; + + if (attr) + return log_token_invalid_attr(rules, key); + if (is_match || op == OP_REMOVE) + return log_token_invalid_op(rules, key); + if (op == OP_ADD) { + log_token_warning(rules, "%s key takes '=' or ':=' operator, assuming '=', but please fix it.", 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 (rules->resolve_name_timing == RESOLVE_NAME_EARLY && + rule_get_substitution_type(value) == SUBST_TYPE_PLAIN) { + r = rule_resolve_group(rules, value, &gid); + if (r < 0) + return log_token_error_errno(rules, 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 (rules->resolve_name_timing != RESOLVE_NAME_NEVER) { + check_value_format_and_warn(rules, key, value, true); + r = rule_line_add_token(rule_line, TK_A_GROUP, op, value, NULL); + } else { + log_token_debug(rules, "Resolving group name is disabled, ignoring %s=%s", key, value); + return 0; + } + } else if (streq(key, "MODE")) { + mode_t mode; + + if (attr) + return log_token_invalid_attr(rules, key); + if (is_match || op == OP_REMOVE) + return log_token_invalid_op(rules, key); + if (op == OP_ADD) { + log_token_warning(rules, "%s key takes '=' or ':=' operator, assuming '=', but please fix it.", 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(rules, 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_token_invalid_attr(rules, key); + check_value_format_and_warn(rules, key, value, true); + if (is_match || op == OP_REMOVE) + return log_token_invalid_op(rules, key); + if (op == OP_ASSIGN_FINAL) { + log_token_warning(rules, "%s key takes '=' or '+=' operator, assuming '=', but please fix it.", 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_token_invalid_op(rules, key); + check_value_format_and_warn(rules, 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_token_error_errno(rules, 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_token_invalid_attr(rules, key); + } else if (streq(key, "GOTO")) { + if (attr) + return log_token_invalid_attr(rules, key); + if (op != OP_ASSIGN) + return log_token_invalid_op(rules, key); + if (FLAGS_SET(rule_line->type, LINE_HAS_GOTO)) { + log_token_warning(rules, "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_token_invalid_attr(rules, key); + if (op != OP_ASSIGN) + return log_token_invalid_op(rules, key); + + rule_line->label = value; + SET_FLAG(rule_line->type, LINE_HAS_LABEL, true); + return 1; + } else + return log_token_error_errno(rules, 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 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 sort_tokens(UdevRuleLine *rule_line) { + UdevRuleToken *head_old; + + assert(rule_line); + + head_old = TAKE_PTR(rule_line->tokens); + rule_line->current_token = NULL; + + while (!LIST_IS_EMPTY(head_old)) { + UdevRuleToken *t, *min_token = NULL; + + LIST_FOREACH(tokens, t, head_old) + if (!min_token || min_token->type > t->type) + min_token = t; + + LIST_REMOVE(tokens, head_old, min_token); + rule_line_append_token(rule_line, min_token); + } +} + +static int rule_add_line(UdevRules *rules, const char *line_str, unsigned line_nr) { + _cleanup_(udev_rule_line_freep) UdevRuleLine *rule_line = NULL; + _cleanup_free_ char *line = NULL; + UdevRuleFile *rule_file; + char *p; + int r; + + assert(rules); + assert(rules->current_file); + assert(line_str); + + rule_file = rules->current_file; + + if (isempty(line_str)) + return 0; + + /* We use memdup_suffix0() here, since we want to add a second NUL byte to the end, since possibly + * some parsers might turn this into a "nulstr", which requires an extra NUL at the end. */ + line = memdup_suffix0(line_str, strlen(line_str) + 1); + 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, + }; + + if (rule_file->current_line) + LIST_APPEND(rule_lines, rule_file->current_line, rule_line); + else + LIST_APPEND(rule_lines, rule_file->rule_lines, rule_line); + + rule_file->current_line = rule_line; + + for (p = rule_line->line; !isempty(p); ) { + char *key, *attr, *value; + UdevRuleOperatorType op; + + r = parse_line(&p, &key, &attr, &op, &value); + if (r < 0) + return log_token_error_errno(rules, r, "Invalid key/value pair, ignoring."); + if (r == 0) + break; + + r = parse_token(rules, key, attr, op, value); + if (r < 0) + return r; + } + + if (rule_line->type == 0) { + log_token_warning(rules, "The line takes no effect, ignoring."); + return 0; + } + + sort_tokens(rule_line); + TAKE_PTR(rule_line); + return 0; +} + +static void rule_resolve_goto(UdevRuleFile *rule_file) { + UdevRuleLine *line, *line_next, *i; + + assert(rule_file); + + /* link GOTOs to LABEL rules in this file to be able to fast-forward */ + LIST_FOREACH_SAFE(rule_lines, line, line_next, rule_file->rule_lines) { + if (!FLAGS_SET(line->type, LINE_HAS_GOTO)) + continue; + + LIST_FOREACH_AFTER(rule_lines, i, line) + if (streq_ptr(i->label, line->goto_label)) { + line->goto_line = i; + break; + } + + if (!line->goto_line) { + log_error("%s:%u: GOTO=\"%s\" has no matching label, ignoring", + rule_file->filename, line->line_number, line->goto_label); + + SET_FLAG(line->type, LINE_HAS_GOTO, false); + line->goto_label = NULL; + + if ((line->type & ~LINE_HAS_LABEL) == 0) { + log_notice("%s:%u: The line takes no effect any more, dropping", + rule_file->filename, line->line_number); + if (line->type == LINE_HAS_LABEL) + udev_rule_line_clear_tokens(line); + else + udev_rule_line_free(line); + } + } + } +} + +int udev_rules_parse_file(UdevRules *rules, const char *filename) { + _cleanup_free_ char *continuation = NULL, *name = NULL; + _cleanup_fclose_ FILE *f = NULL; + UdevRuleFile *rule_file; + bool ignore_line = false; + unsigned line_nr = 0; + int r; + + f = fopen(filename, "re"); + if (!f) { + if (errno == ENOENT) + return 0; + + return -errno; + } + + (void) fd_warn_permissions(filename, fileno(f)); + + if (null_or_empty_fd(fileno(f))) { + log_debug("Skipping empty file: %s", filename); + return 0; + } + + 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), + }; + + if (rules->current_file) + LIST_APPEND(rule_files, rules->current_file, rule_file); + else + LIST_APPEND(rule_files, rules->rule_files, rule_file); + + rules->current_file = rule_file; + + for (;;) { + _cleanup_free_ char *buf = NULL; + size_t len; + char *line; + + r = read_line(f, UTIL_LINE_SIZE, &buf); + if (r < 0) + return r; + if (r == 0) + break; + + line_nr++; + line = skip_leading_chars(buf, NULL); + + if (line[0] == '#') + continue; + + len = strlen(line); + + if (continuation && !ignore_line) { + if (strlen(continuation) + len >= UTIL_LINE_SIZE) + ignore_line = true; + + if (!strextend(&continuation, line, NULL)) + 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_error("%s:%u: Line is too long, ignored", filename, line_nr); + else if (len > 0) + (void) rule_add_line(rules, line, line_nr); + + continuation = mfree(continuation); + ignore_line = false; + } + + rule_resolve_goto(rule_file); + return 0; +} + +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; + char **f; + int r; + + rules = udev_rules_new(resolve_name_timing); + if (!rules) + return -ENOMEM; + + (void) udev_rules_check_timestamp(rules); + + 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); + 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_check_timestamp(UdevRules *rules) { + if (!rules) + return false; + + return paths_check_timestamp(RULES_DIRS, &rules->dirs_ts_usec, true); +} + +static bool token_match_string(UdevRuleToken *token, const char *str) { + const char *i, *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("Invalid match type"); + } + + return token->op == (match ? OP_MATCH : OP_NOMATCH); +} + +static bool token_match_attr(UdevRuleToken *token, sd_device *dev, UdevEvent *event) { + char nbuf[UTIL_NAME_SIZE], vbuf[UTIL_NAME_SIZE]; + const char *name, *value; + + assert(token); + 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); + 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 (util_resolve_subsys_kernel(name, vbuf, sizeof(vbuf), true) < 0) + return false; + value = vbuf; + break; + default: + assert_not_reached("Invalid attribute substitution type"); + } + + /* 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 UTIL_PATH_SIZE]) { + _cleanup_closedir_ DIR *dir = NULL; + struct dirent *dent; + char buf[UTIL_PATH_SIZE], *p; + const char *tail; + size_t len, size; + + 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(&p, size, attr, len); + + dir = opendir(buf); + if (!dir) + return -errno; + + FOREACH_DIRENT_ALL(dent, dir, break) { + if (dent->d_name[0] == '.') + continue; + + strscpyl(p, size, dent->d_name, tail, NULL); + 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( + UdevRules *rules, + sd_device *dev, + UdevEvent *event, + usec_t timeout_usec, + int timeout_signal, + Hashmap *properties_list) { + + UdevRuleToken *token; + char buf[UTIL_PATH_SIZE]; + const char *val; + size_t count; + bool match; + int r; + + assert(rules); + 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. */ + + token = rules->current_file->current_line->current_token; + + switch (token->type) { + case TK_M_ACTION: { + DeviceAction a; + + r = device_get_action(dev, &a); + if (r < 0) + return log_rule_error_errno(dev, rules, r, "Failed to get uevent action type: %m"); + + return token_match_string(token, device_action_to_string(a)); + } + case TK_M_DEVPATH: + r = sd_device_get_devpath(dev, &val); + if (r < 0) + return log_rule_error_errno(dev, rules, r, "Failed to get devpath: %m"); + + return token_match_string(token, val); + case TK_M_KERNEL: + case TK_M_PARENTS_KERNEL: + r = sd_device_get_sysname(dev, &val); + if (r < 0) + return log_rule_error_errno(dev, rules, 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/")))) + 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: + 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 *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("Invalid CONST key"); + return token_match_string(token, val); + } + case TK_M_TAG: + case TK_M_PARENTS_TAG: + FOREACH_DEVICE_TAG(dev, val) + if (token_match_string(token, val)) + return token->op == OP_MATCH; + return token->op == OP_NOMATCH; + case TK_M_SUBSYSTEM: + case TK_M_PARENTS_SUBSYSTEM: + r = sd_device_get_subsystem(dev, &val); + if (r == -ENOENT) + val = NULL; + else if (r < 0) + return log_rule_error_errno(dev, rules, r, "Failed to get subsystem: %m"); + + return token_match_string(token, val); + case TK_M_DRIVER: + case TK_M_PARENTS_DRIVER: + r = sd_device_get_driver(dev, &val); + if (r == -ENOENT) + val = NULL; + else if (r < 0) + return log_rule_error_errno(dev, rules, 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; + + (void) udev_event_apply_format(event, token->data, buf, sizeof(buf), false); + r = sysctl_read(sysctl_normalize(buf), &value); + if (r < 0 && r != -ENOENT) + return log_rule_error_errno(dev, rules, 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); + struct stat statbuf; + + (void) udev_event_apply_format(event, token->value, buf, sizeof(buf), false); + if (!path_is_absolute(buf) && + util_resolve_subsys_kernel(buf, buf, sizeof(buf), false) < 0) { + char tmp[UTIL_PATH_SIZE]; + + r = sd_device_get_syspath(dev, &val); + if (r < 0) + return log_rule_error_errno(dev, rules, r, "Failed to get syspath: %m"); + + strscpy(tmp, sizeof(tmp), buf); + strscpyl(buf, sizeof(buf), val, "/", tmp, NULL); + } + + r = attr_subst_subdir(buf); + if (r == -ENOENT) + return token->op == OP_NOMATCH; + if (r < 0) + return log_rule_error_errno(dev, rules, 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 result[UTIL_LINE_SIZE]; + + event->program_result = mfree(event->program_result); + (void) udev_event_apply_format(event, token->value, buf, sizeof(buf), false); + log_rule_debug(dev, rules, "Running PROGRAM '%s'", buf); + + r = udev_event_spawn(event, timeout_usec, timeout_signal, true, buf, result, sizeof(result)); + if (r != 0) { + if (r < 0) + log_rule_warning_errno(dev, rules, r, "Failed to execute \"%s\": %m", buf); + else /* returned value is positive when program fails */ + log_rule_debug(dev, rules, "Command \"%s\" returned %d (error)", buf, r); + return token->op == OP_NOMATCH; + } + + delete_trailing_chars(result, "\n"); + count = util_replace_chars(result, UDEV_ALLOWED_CHARS_INPUT); + if (count > 0) + log_rule_debug(dev, rules, "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; + + (void) udev_event_apply_format(event, token->value, buf, sizeof(buf), false); + log_rule_debug(dev, rules, "Importing properties from '%s'", buf); + + f = fopen(buf, "re"); + if (!f) { + if (errno != ENOENT) + return log_rule_error_errno(dev, rules, 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_rule_debug_errno(dev, rules, 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_rule_debug_errno(dev, rules, 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_rule_error_errno(dev, rules, r, + "Failed to add property %s=%s: %m", + key, value); + } + + return token->op == OP_MATCH; + } + case TK_M_IMPORT_PROGRAM: { + char result[UTIL_LINE_SIZE], *line, *pos; + + (void) udev_event_apply_format(event, token->value, buf, sizeof(buf), false); + log_rule_debug(dev, rules, "Importing properties from results of '%s'", buf); + + r = udev_event_spawn(event, timeout_usec, timeout_signal, true, buf, result, sizeof result); + if (r != 0) { + if (r < 0) + log_rule_warning_errno(dev, rules, r, "Failed to execute '%s', ignoring: %m", buf); + else /* returned value is positive when program fails */ + log_rule_debug(dev, rules, "Command \"%s\" returned %d (error), ignoring", buf, r); + return token->op == OP_NOMATCH; + } + + for (line = result; !isempty(line); line = pos) { + char *key, *value; + + pos = strchr(line, '\n'); + if (pos) + *pos++ = '\0'; + + r = get_property_from_string(line, &key, &value); + if (r < 0) { + log_rule_debug_errno(dev, rules, 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_rule_error_errno(dev, rules, 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); + unsigned mask = 1U << (int) cmd; + + if (udev_builtin_run_once(cmd)) { + /* check if we ran already */ + if (event->builtin_run & mask) { + log_rule_debug(dev, rules, "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); + log_rule_debug(dev, rules, "Importing properties from results of builtin command '%s'", buf); + + r = udev_builtin_run(dev, cmd, buf, false); + if (r < 0) { + /* remember failure */ + log_rule_debug_errno(dev, rules, 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: { + 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_rule_error_errno(dev, rules, r, + "Failed to get property '%s' from database: %m", + token->value); + + r = device_add_property(dev, token->value, val); + if (r < 0) + return log_rule_error_errno(dev, rules, 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_rule_error_errno(dev, rules, 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_rule_error_errno(dev, rules, r, "Failed to add property '%s=%s': %m", + token->value, value ?: "1"); + return token->op == OP_MATCH; + } + case TK_M_IMPORT_PARENT: { + (void) udev_event_apply_format(event, token->value, buf, sizeof(buf), false); + r = import_parent_into_properties(dev, buf); + if (r < 0) + return log_rule_error_errno(dev, rules, 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_OWNER: { + char owner[UTIL_NAME_SIZE]; + const char *ow = owner; + + 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); + r = get_user_creds(&ow, &event->uid, NULL, NULL, NULL, USER_CREDS_ALLOW_MISSING); + if (r < 0) + log_unknown_owner(dev, rules, r, "user", owner); + else + log_rule_debug(dev, rules, "OWNER %s(%u)", owner, event->uid); + break; + } + case TK_A_GROUP: { + char group[UTIL_NAME_SIZE]; + const char *gr = group; + + 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); + r = get_group_creds(&gr, &event->gid, USER_CREDS_ALLOW_MISSING); + if (r < 0) + log_unknown_owner(dev, rules, r, "group", group); + else + log_rule_debug(dev, rules, "GROUP %s(%u)", group, event->gid); + break; + } + case TK_A_MODE: { + char mode_str[UTIL_NAME_SIZE]; + + 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); + r = parse_mode(mode_str, &event->mode); + if (r < 0) + log_rule_error_errno(dev, rules, r, "Failed to parse mode '%s', ignoring: %m", mode_str); + else + log_rule_debug(dev, rules, "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_rule_debug(dev, rules, "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_rule_debug(dev, rules, "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_rule_debug(dev, rules, "MODE %#o", event->mode); + break; + case TK_A_SECLABEL: { + _cleanup_free_ char *name = NULL, *label = NULL; + char label_str[UTIL_LINE_SIZE] = {}; + + name = strdup(token->data); + if (!name) + return log_oom(); + + (void) udev_event_apply_format(event, token->value, label_str, sizeof(label_str), false); + 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_allocated(&event->seclabel_list, NULL); + if (r < 0) + return log_oom(); + + r = ordered_hashmap_put(event->seclabel_list, name, label); + if (r < 0) + return log_oom(); + log_rule_debug(dev, rules, "SECLABEL{%s}='%s'", name, label); + name = label = NULL; + break; + } + case TK_A_ENV: { + const char *name = token->data; + char value_new[UTIL_NAME_SIZE], *p = value_new; + size_t l = sizeof(value_new); + + if (isempty(token->value)) { + if (token->op == OP_ADD) + break; + r = device_add_property(dev, name, NULL); + if (r < 0) + return log_rule_error_errno(dev, rules, 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(&p, l, val, " ", NULL); + + (void) udev_event_apply_format(event, token->value, p, l, false); + + r = device_add_property(dev, name, value_new); + if (r < 0) + return log_rule_error_errno(dev, rules, r, "Failed to add property '%s=%s': %m", name, value_new); + break; + } + case TK_A_TAG: { + (void) udev_event_apply_format(event, token->value, buf, sizeof(buf), false); + if (token->op == OP_ASSIGN) + device_cleanup_tags(dev); + + if (buf[strspn(buf, ALPHANUMERICAL "-_")] != '\0') { + log_rule_error(dev, rules, "Invalid tag name '%s', ignoring", buf); + break; + } + if (token->op == OP_REMOVE) + device_remove_tag(dev, buf); + else { + r = device_add_tag(dev, buf, true); + if (r < 0) + return log_rule_error_errno(dev, rules, r, "Failed to add tag '%s': %m", buf); + } + break; + } + case TK_A_NAME: { + if (event->name_final) + break; + if (token->op == OP_ASSIGN_FINAL) + event->name_final = true; + + (void) udev_event_apply_format(event, token->value, buf, sizeof(buf), false); + if (IN_SET(event->esc, ESCAPE_UNSET, ESCAPE_REPLACE)) { + count = util_replace_chars(buf, "/"); + if (count > 0) + log_rule_debug(dev, rules, "Replaced %zu character(s) from result of NAME=\"%s\"", + count, token->value); + } + if (sd_device_get_devnum(dev, NULL) >= 0 && + (sd_device_get_devname(dev, &val) < 0 || + !streq_ptr(buf, path_startswith(val, "/dev/")))) { + log_rule_error(dev, rules, + "Kernel device nodes cannot be renamed, ignoring NAME=\"%s\"; please fix it.", + token->value); + break; + } + if (free_and_strdup(&event->name, buf) < 0) + return log_oom(); + + log_rule_debug(dev, rules, "NAME '%s'", event->name); + break; + } + case TK_A_DEVLINK: { + char *p; + + 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); + + /* allow multiple symlinks separated by spaces */ + (void) udev_event_apply_format(event, token->value, buf, sizeof(buf), event->esc != ESCAPE_NONE); + if (event->esc == ESCAPE_UNSET) + count = util_replace_chars(buf, "/ "); + else if (event->esc == ESCAPE_REPLACE) + count = util_replace_chars(buf, "/"); + else + count = 0; + if (count > 0) + log_rule_debug(dev, rules, "Replaced %zu character(s) from result of LINK", count); + + p = skip_leading_chars(buf, NULL); + while (!isempty(p)) { + char filename[UTIL_PATH_SIZE], *next; + + next = strchr(p, ' '); + if (next) { + *next++ = '\0'; + next = skip_leading_chars(next, NULL); + } + + strscpyl(filename, sizeof(filename), "/dev/", p, NULL); + r = device_add_devlink(dev, filename); + if (r < 0) + return log_rule_error_errno(dev, rules, r, "Failed to add devlink '%s': %m", filename); + + log_rule_debug(dev, rules, "LINK '%s'", p); + p = next; + } + break; + } + case TK_A_ATTR: { + const char *key_name = token->data; + char value[UTIL_NAME_SIZE]; + + if (util_resolve_subsys_kernel(key_name, buf, sizeof(buf), false) < 0 && + sd_device_get_syspath(dev, &val) >= 0) + strscpyl(buf, sizeof(buf), val, "/", key_name, NULL); + + r = attr_subst_subdir(buf); + if (r < 0) { + log_rule_error_errno(dev, rules, r, "Could not find file matches '%s', ignoring: %m", buf); + break; + } + (void) udev_event_apply_format(event, token->value, value, sizeof(value), false); + + log_rule_debug(dev, rules, "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); + if (r < 0) + log_rule_error_errno(dev, rules, r, "Failed to write ATTR{%s}, ignoring: %m", buf); + break; + } + case TK_A_SYSCTL: { + char value[UTIL_NAME_SIZE]; + + (void) udev_event_apply_format(event, token->data, buf, sizeof(buf), false); + (void) udev_event_apply_format(event, token->value, value, sizeof(value), false); + sysctl_normalize(buf); + log_rule_debug(dev, rules, "SYSCTL '%s' writing '%s'", buf, value); + r = sysctl_write(buf, value); + if (r < 0) + log_rule_error_errno(dev, rules, 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; + + 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); + + r = ordered_hashmap_ensure_allocated(&event->run_list, NULL); + if (r < 0) + return log_oom(); + + (void) udev_event_apply_format(event, token->value, buf, sizeof(buf), false); + + cmd = strdup(buf); + if (!cmd) + return log_oom(); + + r = ordered_hashmap_put(event->run_list, cmd, token->data); + if (r < 0) + return log_oom(); + + TAKE_PTR(cmd); + + log_rule_debug(dev, rules, "RUN '%s'", token->value); + break; + } + case TK_A_OPTIONS_STATIC_NODE: + /* do nothing for events. */ + break; + default: + assert_not_reached("Invalid token type"); + } + + 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( + UdevRules *rules, + UdevEvent *event, + int timeout_signal) { + + UdevRuleLine *line; + UdevRuleToken *head; + int r; + + line = rules->current_file->current_line; + head = rules->current_file->current_line->current_token; + event->dev_parent = event->dev; + for (;;) { + LIST_FOREACH(tokens, line->current_token, head) { + if (!token_is_for_parents(line->current_token)) + return true; /* All parent tokens match. */ + r = udev_rule_apply_token_to_event(rules, event->dev_parent, event, 0, timeout_signal, NULL); + if (r < 0) + return r; + if (r == 0) + break; + } + if (!line->current_token) + /* All parent tokens match. But no assign tokens in the line. Hmm... */ + 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( + UdevRules *rules, + UdevEvent *event, + usec_t timeout_usec, + int timeout_signal, + Hashmap *properties_list, + UdevRuleLine **next_line) { + + UdevRuleLine *line = rules->current_file->current_line; + UdevRuleLineType mask = LINE_HAS_GOTO | LINE_UPDATE_SOMETHING; + UdevRuleToken *token, *next_token; + bool parents_done = false; + DeviceAction action; + int r; + + r = device_get_action(event->dev, &action); + if (r < 0) + return r; + + if (action != DEVICE_ACTION_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; + LIST_FOREACH_SAFE(tokens, token, next_token, line->tokens) { + line->current_token = token; + + if (token_is_for_parents(token)) { + if (parents_done) + continue; + + r = udev_rule_apply_parent_token_to_event(rules, event, timeout_signal); + if (r <= 0) + return r; + + parents_done = true; + continue; + } + + r = udev_rule_apply_token_to_event(rules, event->dev, event, timeout_usec, timeout_signal, properties_list); + if (r <= 0) + return r; + } + + if (line->goto_line) + *next_line = line->goto_line; + + return 0; +} + +int udev_rules_apply_to_event( + UdevRules *rules, + UdevEvent *event, + usec_t timeout_usec, + int timeout_signal, + Hashmap *properties_list) { + + UdevRuleFile *file; + UdevRuleLine *next_line; + int r; + + assert(rules); + assert(event); + + LIST_FOREACH(rule_files, file, rules->rule_files) { + rules->current_file = file; + LIST_FOREACH_SAFE(rule_lines, file->current_line, next_line, file->rule_lines) { + r = udev_rule_apply_line_to_event(rules, event, timeout_usec, timeout_signal, properties_list, &next_line); + if (r < 0) + return r; + } + } + + return 0; +} + +static int apply_static_dev_perms(const char *devnode, uid_t uid, gid_t gid, mode_t mode, char **tags) { + char device_node[UTIL_PATH_SIZE], tags_dir[UTIL_PATH_SIZE], tag_symlink[UTIL_PATH_SIZE]; + _cleanup_free_ char *unescaped_filename = NULL; + struct stat stats; + char **t; + int r; + + assert(devnode); + + if (uid == UID_INVALID && gid == GID_INVALID && mode == MODE_INVALID && !tags) + return 0; + + strscpyl(device_node, sizeof(device_node), "/dev/", devnode, NULL); + if (stat(device_node, &stats) < 0) { + if (errno != ENOENT) + return log_error_errno(errno, "Failed to stat %s: %m", device_node); + return 0; + } + + if (!S_ISBLK(stats.st_mode) && !S_ISCHR(stats.st_mode)) { + log_warning("%s is neither block nor character device, ignoring.", device_node); + return 0; + } + + if (!strv_isempty(tags)) { + unescaped_filename = xescape(devnode, "/."); + if (!unescaped_filename) + return log_oom(); + } + + /* export the tags to a directory as symlinks, allowing otherwise dead nodes to be tagged */ + STRV_FOREACH(t, tags) { + strscpyl(tags_dir, sizeof(tags_dir), "/run/udev/static_node-tags/", *t, "/", NULL); + r = mkdir_p(tags_dir, 0755); + if (r < 0) + return log_error_errno(r, "Failed to create %s: %m", tags_dir); + + strscpyl(tag_symlink, sizeof(tag_symlink), tags_dir, unescaped_filename, NULL); + r = symlink(device_node, tag_symlink); + if (r < 0 && errno != EEXIST) + return log_error_errno(errno, "Failed to create symlink %s -> %s: %m", + tag_symlink, device_node); + } + + /* don't touch the permissions if only the tags were set */ + if (uid == UID_INVALID && gid == GID_INVALID && mode == MODE_INVALID) + return 0; + + if (mode == MODE_INVALID) + mode = gid_is_valid(gid) ? 0660 : 0600; + if (!uid_is_valid(uid)) + uid = 0; + if (!gid_is_valid(gid)) + gid = 0; + + r = chmod_and_chown(device_node, mode, uid, gid); + if (r == -ENOENT) + return 0; + if (r < 0) + return log_error_errno(r, "Failed to chown '%s' %u %u: %m", device_node, uid, gid); + else + log_debug("chown '%s' %u:%u with mode %#o", device_node, uid, gid, mode); + + (void) utimensat(AT_FDCWD, device_node, NULL, 0); + return 0; +} + +static int udev_rule_line_apply_static_dev_perms(UdevRuleLine *rule_line) { + UdevRuleToken *token; + _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 = apply_static_dev_perms(token->value, uid, gid, mode, tags); + if (r < 0) + return r; + } + + return 0; +} + +int udev_rules_apply_static_dev_perms(UdevRules *rules) { + UdevRuleFile *file; + UdevRuleLine *line; + 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; +} |