diff options
Diffstat (limited to 'src/udev/udev-rules.c')
| -rw-r--r-- | src/udev/udev-rules.c | 2577 |
1 files changed, 0 insertions, 2577 deletions
diff --git a/src/udev/udev-rules.c b/src/udev/udev-rules.c deleted file mode 100644 index 26fa52cf6c..0000000000 --- a/src/udev/udev-rules.c +++ /dev/null @@ -1,2577 +0,0 @@ -/* - * Copyright (C) 2003-2012 Kay Sievers <kay@vrfy.org> - * - * This program is free software: you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation, either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program. If not, see <http://www.gnu.org/licenses/>. - */ - -#include <ctype.h> -#include <dirent.h> -#include <errno.h> -#include <fcntl.h> -#include <fnmatch.h> -#include <limits.h> -#include <stdbool.h> -#include <stddef.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <time.h> -#include <unistd.h> - -#include "alloc-util.h" -#include "conf-files.h" -#include "escape.h" -#include "fd-util.h" -#include "fs-util.h" -#include "glob-util.h" -#include "path-util.h" -#include "stat-util.h" -#include "stdio-util.h" -#include "strbuf.h" -#include "string-util.h" -#include "strv.h" -#include "sysctl-util.h" -#include "udev.h" -#include "user-util.h" -#include "util.h" - -#define PREALLOC_TOKEN 2048 - -struct uid_gid { - unsigned int name_off; - union { - uid_t uid; - gid_t gid; - }; -}; - -static const char* const rules_dirs[] = { - "/etc/udev/rules.d", - "/run/udev/rules.d", - UDEVLIBEXECDIR "/rules.d", - NULL -}; - -struct udev_rules { - struct udev *udev; - usec_t dirs_ts_usec; - int resolve_names; - - /* every key in the rules file becomes a token */ - struct token *tokens; - unsigned int token_cur; - unsigned int token_max; - - /* all key strings are copied and de-duplicated in a single continuous string buffer */ - struct strbuf *strbuf; - - /* during rule parsing, uid/gid lookup results are cached */ - struct uid_gid *uids; - unsigned int uids_cur; - unsigned int uids_max; - struct uid_gid *gids; - unsigned int gids_cur; - unsigned int gids_max; -}; - -static char *rules_str(struct udev_rules *rules, unsigned int off) { - return rules->strbuf->buf + off; -} - -static unsigned int rules_add_string(struct udev_rules *rules, const char *s) { - return strbuf_add_string(rules->strbuf, s, strlen(s)); -} - -/* KEY=="", KEY!="", KEY+="", KEY-="", KEY="", KEY:="" */ -enum operation_type { - OP_UNSET, - - OP_MATCH, - OP_NOMATCH, - OP_MATCH_MAX, - - OP_ADD, - OP_REMOVE, - OP_ASSIGN, - OP_ASSIGN_FINAL, -}; - -enum string_glob_type { - GL_UNSET, - GL_PLAIN, /* no special chars */ - GL_GLOB, /* shell globs ?,*,[] */ - GL_SPLIT, /* multi-value A|B */ - GL_SPLIT_GLOB, /* multi-value with glob A*|B* */ - GL_SOMETHING, /* commonly used "?*" */ -}; - -enum string_subst_type { - SB_UNSET, - SB_NONE, - SB_FORMAT, - SB_SUBSYS, -}; - -/* tokens of a rule are sorted/handled in this order */ -enum token_type { - TK_UNSET, - TK_RULE, - - TK_M_ACTION, /* val */ - TK_M_DEVPATH, /* val */ - TK_M_KERNEL, /* val */ - TK_M_DEVLINK, /* val */ - TK_M_NAME, /* val */ - TK_M_ENV, /* val, attr */ - TK_M_TAG, /* val */ - TK_M_SUBSYSTEM, /* val */ - TK_M_DRIVER, /* val */ - TK_M_WAITFOR, /* val */ - TK_M_ATTR, /* val, attr */ - TK_M_SYSCTL, /* val, attr */ - - TK_M_PARENTS_MIN, - TK_M_KERNELS, /* val */ - TK_M_SUBSYSTEMS, /* val */ - TK_M_DRIVERS, /* val */ - TK_M_ATTRS, /* val, attr */ - TK_M_TAGS, /* val */ - TK_M_PARENTS_MAX, - - TK_M_TEST, /* val, mode_t */ - TK_M_PROGRAM, /* val */ - TK_M_IMPORT_FILE, /* val */ - TK_M_IMPORT_PROG, /* val */ - TK_M_IMPORT_BUILTIN, /* val */ - TK_M_IMPORT_DB, /* val */ - TK_M_IMPORT_CMDLINE, /* val */ - TK_M_IMPORT_PARENT, /* val */ - TK_M_RESULT, /* val */ - TK_M_MAX, - - TK_A_STRING_ESCAPE_NONE, - TK_A_STRING_ESCAPE_REPLACE, - TK_A_DB_PERSIST, - TK_A_INOTIFY_WATCH, /* int */ - TK_A_DEVLINK_PRIO, /* int */ - TK_A_OWNER, /* val */ - TK_A_GROUP, /* val */ - TK_A_MODE, /* val */ - TK_A_OWNER_ID, /* uid_t */ - TK_A_GROUP_ID, /* gid_t */ - TK_A_MODE_ID, /* mode_t */ - TK_A_TAG, /* val */ - TK_A_STATIC_NODE, /* val */ - TK_A_SECLABEL, /* val, attr */ - TK_A_ENV, /* val, attr */ - TK_A_NAME, /* val */ - TK_A_DEVLINK, /* val */ - TK_A_ATTR, /* val, attr */ - TK_A_SYSCTL, /* val, attr */ - TK_A_RUN_BUILTIN, /* val, bool */ - TK_A_RUN_PROGRAM, /* val, bool */ - TK_A_GOTO, /* size_t */ - - TK_END, -}; - -/* we try to pack stuff in a way that we take only 12 bytes per token */ -struct token { - union { - unsigned char type; /* same in rule and key */ - struct { - enum token_type type:8; - bool can_set_name:1; - bool has_static_node:1; - unsigned int unused:6; - unsigned short token_count; - unsigned int label_off; - unsigned short filename_off; - unsigned short filename_line; - } rule; - struct { - enum token_type type:8; - enum operation_type op:8; - enum string_glob_type glob:8; - enum string_subst_type subst:4; - enum string_subst_type attrsubst:4; - unsigned int value_off; - union { - unsigned int attr_off; - unsigned int rule_goto; - mode_t mode; - uid_t uid; - gid_t gid; - int devlink_prio; - int watch; - enum udev_builtin_cmd builtin_cmd; - }; - } key; - }; -}; - -#define MAX_TK 64 -struct rule_tmp { - struct udev_rules *rules; - struct token rule; - struct token token[MAX_TK]; - unsigned int token_cur; -}; - -#ifdef DEBUG -static const char *operation_str(enum operation_type type) { - static const char *operation_strs[] = { - [OP_UNSET] = "UNSET", - [OP_MATCH] = "match", - [OP_NOMATCH] = "nomatch", - [OP_MATCH_MAX] = "MATCH_MAX", - - [OP_ADD] = "add", - [OP_REMOVE] = "remove", - [OP_ASSIGN] = "assign", - [OP_ASSIGN_FINAL] = "assign-final", -} ; - - return operation_strs[type]; -} - -static const char *string_glob_str(enum string_glob_type type) { - static const char *string_glob_strs[] = { - [GL_UNSET] = "UNSET", - [GL_PLAIN] = "plain", - [GL_GLOB] = "glob", - [GL_SPLIT] = "split", - [GL_SPLIT_GLOB] = "split-glob", - [GL_SOMETHING] = "split-glob", - }; - - return string_glob_strs[type]; -} - -static const char *token_str(enum token_type type) { - static const char *token_strs[] = { - [TK_UNSET] = "UNSET", - [TK_RULE] = "RULE", - - [TK_M_ACTION] = "M ACTION", - [TK_M_DEVPATH] = "M DEVPATH", - [TK_M_KERNEL] = "M KERNEL", - [TK_M_DEVLINK] = "M DEVLINK", - [TK_M_NAME] = "M NAME", - [TK_M_ENV] = "M ENV", - [TK_M_TAG] = "M TAG", - [TK_M_SUBSYSTEM] = "M SUBSYSTEM", - [TK_M_DRIVER] = "M DRIVER", - [TK_M_WAITFOR] = "M WAITFOR", - [TK_M_ATTR] = "M ATTR", - [TK_M_SYSCTL] = "M SYSCTL", - - [TK_M_PARENTS_MIN] = "M PARENTS_MIN", - [TK_M_KERNELS] = "M KERNELS", - [TK_M_SUBSYSTEMS] = "M SUBSYSTEMS", - [TK_M_DRIVERS] = "M DRIVERS", - [TK_M_ATTRS] = "M ATTRS", - [TK_M_TAGS] = "M TAGS", - [TK_M_PARENTS_MAX] = "M PARENTS_MAX", - - [TK_M_TEST] = "M TEST", - [TK_M_PROGRAM] = "M PROGRAM", - [TK_M_IMPORT_FILE] = "M IMPORT_FILE", - [TK_M_IMPORT_PROG] = "M IMPORT_PROG", - [TK_M_IMPORT_BUILTIN] = "M IMPORT_BUILTIN", - [TK_M_IMPORT_DB] = "M IMPORT_DB", - [TK_M_IMPORT_CMDLINE] = "M IMPORT_CMDLINE", - [TK_M_IMPORT_PARENT] = "M IMPORT_PARENT", - [TK_M_RESULT] = "M RESULT", - [TK_M_MAX] = "M MAX", - - [TK_A_STRING_ESCAPE_NONE] = "A STRING_ESCAPE_NONE", - [TK_A_STRING_ESCAPE_REPLACE] = "A STRING_ESCAPE_REPLACE", - [TK_A_DB_PERSIST] = "A DB_PERSIST", - [TK_A_INOTIFY_WATCH] = "A INOTIFY_WATCH", - [TK_A_DEVLINK_PRIO] = "A DEVLINK_PRIO", - [TK_A_OWNER] = "A OWNER", - [TK_A_GROUP] = "A GROUP", - [TK_A_MODE] = "A MODE", - [TK_A_OWNER_ID] = "A OWNER_ID", - [TK_A_GROUP_ID] = "A GROUP_ID", - [TK_A_STATIC_NODE] = "A STATIC_NODE", - [TK_A_SECLABEL] = "A SECLABEL", - [TK_A_MODE_ID] = "A MODE_ID", - [TK_A_ENV] = "A ENV", - [TK_A_TAG] = "A ENV", - [TK_A_NAME] = "A NAME", - [TK_A_DEVLINK] = "A DEVLINK", - [TK_A_ATTR] = "A ATTR", - [TK_A_SYSCTL] = "A SYSCTL", - [TK_A_RUN_BUILTIN] = "A RUN_BUILTIN", - [TK_A_RUN_PROGRAM] = "A RUN_PROGRAM", - [TK_A_GOTO] = "A GOTO", - - [TK_END] = "END", - }; - - return token_strs[type]; -} - -static void dump_token(struct udev_rules *rules, struct token *token) { - enum token_type type = token->type; - enum operation_type op = token->key.op; - enum string_glob_type glob = token->key.glob; - const char *value = rules_str(rules, token->key.value_off); - const char *attr = &rules->strbuf->buf[token->key.attr_off]; - - switch (type) { - case TK_RULE: - { - const char *tks_ptr = (char *)rules->tokens; - const char *tk_ptr = (char *)token; - unsigned int idx = (tk_ptr - tks_ptr) / sizeof(struct token); - - log_debug("* RULE %s:%u, token: %u, count: %u, label: '%s'", - &rules->strbuf->buf[token->rule.filename_off], token->rule.filename_line, - idx, token->rule.token_count, - &rules->strbuf->buf[token->rule.label_off]); - break; - } - case TK_M_ACTION: - case TK_M_DEVPATH: - case TK_M_KERNEL: - case TK_M_SUBSYSTEM: - case TK_M_DRIVER: - case TK_M_WAITFOR: - case TK_M_DEVLINK: - case TK_M_NAME: - case TK_M_KERNELS: - case TK_M_SUBSYSTEMS: - case TK_M_DRIVERS: - case TK_M_TAGS: - case TK_M_PROGRAM: - case TK_M_IMPORT_FILE: - case TK_M_IMPORT_PROG: - case TK_M_IMPORT_DB: - case TK_M_IMPORT_CMDLINE: - case TK_M_IMPORT_PARENT: - case TK_M_RESULT: - case TK_A_NAME: - case TK_A_DEVLINK: - case TK_A_OWNER: - case TK_A_GROUP: - case TK_A_MODE: - case TK_A_RUN_BUILTIN: - case TK_A_RUN_PROGRAM: - log_debug("%s %s '%s'(%s)", - token_str(type), operation_str(op), value, string_glob_str(glob)); - break; - case TK_M_IMPORT_BUILTIN: - log_debug("%s %i '%s'", token_str(type), token->key.builtin_cmd, value); - break; - case TK_M_ATTR: - case TK_M_SYSCTL: - case TK_M_ATTRS: - case TK_M_ENV: - case TK_A_ATTR: - case TK_A_SYSCTL: - case TK_A_ENV: - log_debug("%s %s '%s' '%s'(%s)", - token_str(type), operation_str(op), attr, value, string_glob_str(glob)); - break; - case TK_M_TAG: - case TK_A_TAG: - log_debug("%s %s '%s'", token_str(type), operation_str(op), value); - break; - case TK_A_STRING_ESCAPE_NONE: - case TK_A_STRING_ESCAPE_REPLACE: - case TK_A_DB_PERSIST: - log_debug("%s", token_str(type)); - break; - case TK_M_TEST: - log_debug("%s %s '%s'(%s) %#o", - token_str(type), operation_str(op), value, string_glob_str(glob), token->key.mode); - break; - case TK_A_INOTIFY_WATCH: - log_debug("%s %u", token_str(type), token->key.watch); - break; - case TK_A_DEVLINK_PRIO: - log_debug("%s %u", token_str(type), token->key.devlink_prio); - break; - case TK_A_OWNER_ID: - log_debug("%s %s %u", token_str(type), operation_str(op), token->key.uid); - break; - case TK_A_GROUP_ID: - log_debug("%s %s %u", token_str(type), operation_str(op), token->key.gid); - break; - case TK_A_MODE_ID: - log_debug("%s %s %#o", token_str(type), operation_str(op), token->key.mode); - break; - case TK_A_STATIC_NODE: - log_debug("%s '%s'", token_str(type), value); - break; - case TK_A_SECLABEL: - log_debug("%s %s '%s' '%s'", token_str(type), operation_str(op), attr, value); - break; - case TK_A_GOTO: - log_debug("%s '%s' %u", token_str(type), value, token->key.rule_goto); - break; - case TK_END: - log_debug("* %s", token_str(type)); - break; - case TK_M_PARENTS_MIN: - case TK_M_PARENTS_MAX: - case TK_M_MAX: - case TK_UNSET: - log_debug("unknown type %u", type); - break; - } -} - -static void dump_rules(struct udev_rules *rules) { - unsigned int i; - - log_debug("dumping %u (%zu bytes) tokens, %zu (%zu bytes) strings", - rules->token_cur, - rules->token_cur * sizeof(struct token), - rules->strbuf->nodes_count, - rules->strbuf->len); - for (i = 0; i < rules->token_cur; i++) - dump_token(rules, &rules->tokens[i]); -} -#else -static inline void dump_token(struct udev_rules *rules, struct token *token) {} -static inline void dump_rules(struct udev_rules *rules) {} -#endif /* DEBUG */ - -static int add_token(struct udev_rules *rules, struct token *token) { - /* grow buffer if needed */ - if (rules->token_cur+1 >= rules->token_max) { - struct token *tokens; - unsigned int add; - - /* double the buffer size */ - add = rules->token_max; - if (add < 8) - add = 8; - - tokens = realloc(rules->tokens, (rules->token_max + add ) * sizeof(struct token)); - if (tokens == NULL) - return -1; - rules->tokens = tokens; - rules->token_max += add; - } - memcpy(&rules->tokens[rules->token_cur], token, sizeof(struct token)); - rules->token_cur++; - return 0; -} - -static uid_t add_uid(struct udev_rules *rules, const char *owner) { - unsigned int i; - uid_t uid = 0; - unsigned int off; - int r; - - /* lookup, if we know it already */ - for (i = 0; i < rules->uids_cur; i++) { - off = rules->uids[i].name_off; - if (streq(rules_str(rules, off), owner)) { - uid = rules->uids[i].uid; - return uid; - } - } - r = get_user_creds(&owner, &uid, NULL, NULL, NULL); - if (r < 0) { - if (r == -ENOENT || r == -ESRCH) - log_error("specified user '%s' unknown", owner); - else - log_error_errno(r, "error resolving user '%s': %m", owner); - } - - /* grow buffer if needed */ - if (rules->uids_cur+1 >= rules->uids_max) { - struct uid_gid *uids; - unsigned int add; - - /* double the buffer size */ - add = rules->uids_max; - if (add < 1) - add = 8; - - uids = realloc(rules->uids, (rules->uids_max + add ) * sizeof(struct uid_gid)); - if (uids == NULL) - return uid; - rules->uids = uids; - rules->uids_max += add; - } - rules->uids[rules->uids_cur].uid = uid; - off = rules_add_string(rules, owner); - if (off <= 0) - return uid; - rules->uids[rules->uids_cur].name_off = off; - rules->uids_cur++; - return uid; -} - -static gid_t add_gid(struct udev_rules *rules, const char *group) { - unsigned int i; - gid_t gid = 0; - unsigned int off; - int r; - - /* lookup, if we know it already */ - for (i = 0; i < rules->gids_cur; i++) { - off = rules->gids[i].name_off; - if (streq(rules_str(rules, off), group)) { - gid = rules->gids[i].gid; - return gid; - } - } - r = get_group_creds(&group, &gid); - if (r < 0) { - if (r == -ENOENT || r == -ESRCH) - log_error("specified group '%s' unknown", group); - else - log_error_errno(r, "error resolving group '%s': %m", group); - } - - /* grow buffer if needed */ - if (rules->gids_cur+1 >= rules->gids_max) { - struct uid_gid *gids; - unsigned int add; - - /* double the buffer size */ - add = rules->gids_max; - if (add < 1) - add = 8; - - gids = realloc(rules->gids, (rules->gids_max + add ) * sizeof(struct uid_gid)); - if (gids == NULL) - return gid; - rules->gids = gids; - rules->gids_max += add; - } - rules->gids[rules->gids_cur].gid = gid; - off = rules_add_string(rules, group); - if (off <= 0) - return gid; - rules->gids[rules->gids_cur].name_off = off; - rules->gids_cur++; - return gid; -} - -static int import_property_from_string(struct udev_device *dev, char *line) { - char *key; - char *val; - size_t len; - - /* find key */ - key = line; - while (isspace(key[0])) - key++; - - /* comment or empty line */ - if (key[0] == '#' || key[0] == '\0') - return -1; - - /* split key/value */ - val = strchr(key, '='); - if (val == NULL) - return -1; - val[0] = '\0'; - val++; - - /* find value */ - while (isspace(val[0])) - val++; - - /* terminate key */ - len = strlen(key); - if (len == 0) - return -1; - while (isspace(key[len-1])) - len--; - key[len] = '\0'; - - /* terminate value */ - len = strlen(val); - if (len == 0) - return -1; - while (isspace(val[len-1])) - len--; - val[len] = '\0'; - - if (len == 0) - return -1; - - /* unquote */ - if (val[0] == '"' || val[0] == '\'') { - if (val[len-1] != val[0]) { - log_debug("inconsistent quoting: '%s', skip", line); - return -1; - } - val[len-1] = '\0'; - val++; - } - - udev_device_add_property(dev, key, val); - - return 0; -} - -static int import_file_into_properties(struct udev_device *dev, const char *filename) { - FILE *f; - char line[UTIL_LINE_SIZE]; - - f = fopen(filename, "re"); - if (f == NULL) - return -1; - while (fgets(line, sizeof(line), f) != NULL) - import_property_from_string(dev, line); - fclose(f); - return 0; -} - -static int import_program_into_properties(struct udev_event *event, - usec_t timeout_usec, - usec_t timeout_warn_usec, - const char *program) { - char result[UTIL_LINE_SIZE]; - char *line; - int err; - - err = udev_event_spawn(event, timeout_usec, timeout_warn_usec, true, program, result, sizeof(result)); - if (err < 0) - return err; - - line = result; - while (line != NULL) { - char *pos; - - pos = strchr(line, '\n'); - if (pos != NULL) { - pos[0] = '\0'; - pos = &pos[1]; - } - import_property_from_string(event->dev, line); - line = pos; - } - return 0; -} - -static int import_parent_into_properties(struct udev_device *dev, const char *filter) { - struct udev_device *dev_parent; - struct udev_list_entry *list_entry; - - assert(dev); - assert(filter); - - dev_parent = udev_device_get_parent(dev); - if (dev_parent == NULL) - return -1; - - udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(dev_parent)) { - const char *key = udev_list_entry_get_name(list_entry); - const char *val = udev_list_entry_get_value(list_entry); - - if (fnmatch(filter, key, 0) == 0) - udev_device_add_property(dev, key, val); - } - return 0; -} - -static void attr_subst_subdir(char *attr, size_t len) { - const char *pos, *tail, *path; - _cleanup_closedir_ DIR *dir = NULL; - struct dirent *dent; - - pos = strstr(attr, "/*/"); - if (!pos) - return; - - tail = pos + 2; - path = strndupa(attr, pos - attr + 1); /* include slash at end */ - dir = opendir(path); - if (dir == NULL) - return; - - for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) - if (dent->d_name[0] != '.') { - char n[strlen(dent->d_name) + strlen(tail) + 1]; - - strscpyl(n, sizeof n, dent->d_name, tail, NULL); - if (faccessat(dirfd(dir), n, F_OK, 0) == 0) { - strscpyl(attr, len, path, n, NULL); - break; - } - } -} - -static int get_key(struct udev *udev, char **line, char **key, enum operation_type *op, char **value) { - char *linepos; - char *temp; - - linepos = *line; - if (linepos == NULL || linepos[0] == '\0') - return -1; - - /* skip whitespace */ - while (isspace(linepos[0]) || linepos[0] == ',') - linepos++; - - /* get the key */ - if (linepos[0] == '\0') - return -1; - *key = linepos; - - for (;;) { - linepos++; - if (linepos[0] == '\0') - return -1; - if (isspace(linepos[0])) - break; - if (linepos[0] == '=') - break; - if ((linepos[0] == '+') || (linepos[0] == '-') || (linepos[0] == '!') || (linepos[0] == ':')) - if (linepos[1] == '=') - break; - } - - /* remember end of key */ - temp = linepos; - - /* skip whitespace after key */ - while (isspace(linepos[0])) - linepos++; - if (linepos[0] == '\0') - return -1; - - /* get operation type */ - if (linepos[0] == '=' && linepos[1] == '=') { - *op = OP_MATCH; - linepos += 2; - } else if (linepos[0] == '!' && linepos[1] == '=') { - *op = OP_NOMATCH; - linepos += 2; - } else if (linepos[0] == '+' && linepos[1] == '=') { - *op = OP_ADD; - linepos += 2; - } else if (linepos[0] == '-' && linepos[1] == '=') { - *op = OP_REMOVE; - linepos += 2; - } else if (linepos[0] == '=') { - *op = OP_ASSIGN; - linepos++; - } else if (linepos[0] == ':' && linepos[1] == '=') { - *op = OP_ASSIGN_FINAL; - linepos += 2; - } else - return -1; - - /* terminate key */ - temp[0] = '\0'; - - /* skip whitespace after operator */ - while (isspace(linepos[0])) - linepos++; - if (linepos[0] == '\0') - return -1; - - /* get the value */ - if (linepos[0] == '"') - linepos++; - else - return -1; - *value = linepos; - - /* terminate */ - temp = strchr(linepos, '"'); - if (!temp) - return -1; - temp[0] = '\0'; - temp++; - - /* move line to next key */ - *line = temp; - return 0; -} - -/* extract possible KEY{attr} */ -static const char *get_key_attribute(struct udev *udev, char *str) { - char *pos; - char *attr; - - attr = strchr(str, '{'); - if (attr != NULL) { - attr++; - pos = strchr(attr, '}'); - if (pos == NULL) { - log_error("missing closing brace for format"); - return NULL; - } - pos[0] = '\0'; - return attr; - } - return NULL; -} - -static void rule_add_key(struct rule_tmp *rule_tmp, enum token_type type, - enum operation_type op, - const char *value, const void *data) { - struct token *token = rule_tmp->token + rule_tmp->token_cur; - const char *attr = NULL; - - assert(rule_tmp->token_cur < ELEMENTSOF(rule_tmp->token)); - memzero(token, sizeof(struct token)); - - switch (type) { - case TK_M_ACTION: - case TK_M_DEVPATH: - case TK_M_KERNEL: - case TK_M_SUBSYSTEM: - case TK_M_DRIVER: - case TK_M_WAITFOR: - case TK_M_DEVLINK: - case TK_M_NAME: - case TK_M_KERNELS: - case TK_M_SUBSYSTEMS: - case TK_M_DRIVERS: - case TK_M_TAGS: - case TK_M_PROGRAM: - case TK_M_IMPORT_FILE: - case TK_M_IMPORT_PROG: - case TK_M_IMPORT_DB: - case TK_M_IMPORT_CMDLINE: - case TK_M_IMPORT_PARENT: - case TK_M_RESULT: - case TK_A_OWNER: - case TK_A_GROUP: - case TK_A_MODE: - case TK_A_DEVLINK: - case TK_A_NAME: - case TK_A_GOTO: - case TK_M_TAG: - case TK_A_TAG: - case TK_A_STATIC_NODE: - token->key.value_off = rules_add_string(rule_tmp->rules, value); - break; - case TK_M_IMPORT_BUILTIN: - token->key.value_off = rules_add_string(rule_tmp->rules, value); - token->key.builtin_cmd = *(enum udev_builtin_cmd *)data; - break; - case TK_M_ENV: - case TK_M_ATTR: - case TK_M_SYSCTL: - case TK_M_ATTRS: - case TK_A_ATTR: - case TK_A_SYSCTL: - case TK_A_ENV: - case TK_A_SECLABEL: - attr = data; - token->key.value_off = rules_add_string(rule_tmp->rules, value); - token->key.attr_off = rules_add_string(rule_tmp->rules, attr); - break; - case TK_M_TEST: - token->key.value_off = rules_add_string(rule_tmp->rules, value); - if (data != NULL) - token->key.mode = *(mode_t *)data; - break; - case TK_A_STRING_ESCAPE_NONE: - case TK_A_STRING_ESCAPE_REPLACE: - case TK_A_DB_PERSIST: - break; - case TK_A_RUN_BUILTIN: - case TK_A_RUN_PROGRAM: - token->key.builtin_cmd = *(enum udev_builtin_cmd *)data; - token->key.value_off = rules_add_string(rule_tmp->rules, value); - break; - case TK_A_INOTIFY_WATCH: - case TK_A_DEVLINK_PRIO: - token->key.devlink_prio = *(int *)data; - break; - case TK_A_OWNER_ID: - token->key.uid = *(uid_t *)data; - break; - case TK_A_GROUP_ID: - token->key.gid = *(gid_t *)data; - break; - case TK_A_MODE_ID: - token->key.mode = *(mode_t *)data; - break; - case TK_RULE: - case TK_M_PARENTS_MIN: - case TK_M_PARENTS_MAX: - case TK_M_MAX: - case TK_END: - case TK_UNSET: - assert_not_reached("wrong type"); - } - - if (value != NULL && type < TK_M_MAX) { - /* check if we need to split or call fnmatch() while matching rules */ - enum string_glob_type glob; - int has_split; - int has_glob; - - has_split = (strchr(value, '|') != NULL); - has_glob = string_is_glob(value); - if (has_split && has_glob) { - glob = GL_SPLIT_GLOB; - } else if (has_split) { - glob = GL_SPLIT; - } else if (has_glob) { - if (streq(value, "?*")) - glob = GL_SOMETHING; - else - glob = GL_GLOB; - } else { - glob = GL_PLAIN; - } - token->key.glob = glob; - } - - if (value != NULL && type > TK_M_MAX) { - /* check if assigned value has substitution chars */ - if (value[0] == '[') - token->key.subst = SB_SUBSYS; - else if (strchr(value, '%') != NULL || strchr(value, '$') != NULL) - token->key.subst = SB_FORMAT; - else - token->key.subst = SB_NONE; - } - - if (attr != NULL) { - /* check if property/attribute name has substitution chars */ - if (attr[0] == '[') - token->key.attrsubst = SB_SUBSYS; - else if (strchr(attr, '%') != NULL || strchr(attr, '$') != NULL) - token->key.attrsubst = SB_FORMAT; - else - token->key.attrsubst = SB_NONE; - } - - token->key.type = type; - token->key.op = op; - rule_tmp->token_cur++; -} - -static int sort_token(struct udev_rules *rules, struct rule_tmp *rule_tmp) { - unsigned int i; - unsigned int start = 0; - unsigned int end = rule_tmp->token_cur; - - for (i = 0; i < rule_tmp->token_cur; i++) { - enum token_type next_val = TK_UNSET; - unsigned int next_idx = 0; - unsigned int j; - - /* find smallest value */ - for (j = start; j < end; j++) { - if (rule_tmp->token[j].type == TK_UNSET) - continue; - if (next_val == TK_UNSET || rule_tmp->token[j].type < next_val) { - next_val = rule_tmp->token[j].type; - next_idx = j; - } - } - - /* add token and mark done */ - if (add_token(rules, &rule_tmp->token[next_idx]) != 0) - return -1; - rule_tmp->token[next_idx].type = TK_UNSET; - - /* shrink range */ - if (next_idx == start) - start++; - if (next_idx+1 == end) - end--; - } - return 0; -} - -#define LOG_RULE_ERROR(fmt, ...) log_error("Invalid rule %s:%u: " fmt, filename, lineno, ##__VA_ARGS__) -#define LOG_RULE_WARNING(fmt, ...) log_warning("%s:%u: " fmt, filename, lineno, ##__VA_ARGS__) -#define LOG_RULE_DEBUG(fmt, ...) log_debug("%s:%u: " fmt, filename, lineno, ##__VA_ARGS__) -#define LOG_AND_RETURN(fmt, ...) { LOG_RULE_ERROR(fmt, __VA_ARGS__); return; } - -static void add_rule(struct udev_rules *rules, char *line, - const char *filename, unsigned int filename_off, unsigned int lineno) { - char *linepos; - const char *attr; - struct rule_tmp rule_tmp = { - .rules = rules, - .rule.type = TK_RULE, - }; - - /* the offset in the rule is limited to unsigned short */ - if (filename_off < USHRT_MAX) - rule_tmp.rule.rule.filename_off = filename_off; - rule_tmp.rule.rule.filename_line = lineno; - - linepos = line; - for (;;) { - char *key; - char *value; - enum operation_type op; - - if (get_key(rules->udev, &linepos, &key, &op, &value) != 0) { - /* Avoid erroring on trailing whitespace. This is probably rare - * so save the work for the error case instead of always trying - * to strip the trailing whitespace with strstrip(). */ - while (isblank(*linepos)) - linepos++; - - /* If we aren't at the end of the line, this is a parsing error. - * Make a best effort to describe where the problem is. */ - if (!strchr(NEWLINE, *linepos)) { - char buf[2] = {*linepos}; - _cleanup_free_ char *tmp; - - tmp = cescape(buf); - log_error("invalid key/value pair in file %s on line %u, starting at character %tu ('%s')", - filename, lineno, linepos - line + 1, tmp); - if (*linepos == '#') - log_error("hint: comments can only start at beginning of line"); - } - break; - } - - if (rule_tmp.token_cur >= ELEMENTSOF(rule_tmp.token)) - LOG_AND_RETURN("temporary rule array too small, aborting event processing with %u items", rule_tmp.token_cur); - - if (streq(key, "ACTION")) { - if (op > OP_MATCH_MAX) - LOG_AND_RETURN("invalid %s operation", key); - - rule_add_key(&rule_tmp, TK_M_ACTION, op, value, NULL); - - } else if (streq(key, "DEVPATH")) { - if (op > OP_MATCH_MAX) - LOG_AND_RETURN("invalid %s operation", key); - - rule_add_key(&rule_tmp, TK_M_DEVPATH, op, value, NULL); - - } else if (streq(key, "KERNEL")) { - if (op > OP_MATCH_MAX) - LOG_AND_RETURN("invalid %s operation", key); - - rule_add_key(&rule_tmp, TK_M_KERNEL, op, value, NULL); - - } else if (streq(key, "SUBSYSTEM")) { - if (op > OP_MATCH_MAX) - LOG_AND_RETURN("invalid %s operation", key); - - /* bus, class, subsystem events should all be the same */ - if (STR_IN_SET(value, "subsystem", "bus", "class")) { - if (!streq(value, "subsystem")) - LOG_RULE_WARNING("'%s' must be specified as 'subsystem'; please fix", value); - - rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, "subsystem|class|bus", NULL); - } else - rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, value, NULL); - - } else if (streq(key, "DRIVER")) { - if (op > OP_MATCH_MAX) - LOG_AND_RETURN("invalid %s operation", key); - - rule_add_key(&rule_tmp, TK_M_DRIVER, op, value, NULL); - - } else if (startswith(key, "ATTR{")) { - attr = get_key_attribute(rules->udev, key + strlen("ATTR")); - if (attr == NULL) - LOG_AND_RETURN("error parsing %s attribute", "ATTR"); - - if (op == OP_REMOVE) - LOG_AND_RETURN("invalid %s operation", "ATTR"); - - if (op < OP_MATCH_MAX) - rule_add_key(&rule_tmp, TK_M_ATTR, op, value, attr); - else - rule_add_key(&rule_tmp, TK_A_ATTR, op, value, attr); - - } else if (startswith(key, "SYSCTL{")) { - attr = get_key_attribute(rules->udev, key + strlen("SYSCTL")); - if (attr == NULL) - LOG_AND_RETURN("error parsing %s attribute", "ATTR"); - - if (op == OP_REMOVE) - LOG_AND_RETURN("invalid %s operation", "ATTR"); - - if (op < OP_MATCH_MAX) - rule_add_key(&rule_tmp, TK_M_SYSCTL, op, value, attr); - else - rule_add_key(&rule_tmp, TK_A_SYSCTL, op, value, attr); - - } else if (startswith(key, "SECLABEL{")) { - attr = get_key_attribute(rules->udev, key + strlen("SECLABEL")); - if (attr == NULL) - LOG_AND_RETURN("error parsing %s attribute", "SECLABEL"); - - if (op == OP_REMOVE) - LOG_AND_RETURN("invalid %s operation", "SECLABEL"); - - rule_add_key(&rule_tmp, TK_A_SECLABEL, op, value, attr); - - } else if (streq(key, "KERNELS")) { - if (op > OP_MATCH_MAX) - LOG_AND_RETURN("invalid %s operation", key); - - rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL); - - } else if (streq(key, "SUBSYSTEMS")) { - if (op > OP_MATCH_MAX) - LOG_AND_RETURN("invalid %s operation", key); - - rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL); - - } else if (streq(key, "DRIVERS")) { - if (op > OP_MATCH_MAX) - LOG_AND_RETURN("invalid %s operation", key); - - rule_add_key(&rule_tmp, TK_M_DRIVERS, op, value, NULL); - - } else if (startswith(key, "ATTRS{")) { - if (op > OP_MATCH_MAX) - LOG_AND_RETURN("invalid %s operation", "ATTRS"); - - attr = get_key_attribute(rules->udev, key + strlen("ATTRS")); - if (attr == NULL) - LOG_AND_RETURN("error parsing %s attribute", "ATTRS"); - - if (startswith(attr, "device/")) - LOG_RULE_WARNING("'device' link may not be available in future kernels; please fix"); - if (strstr(attr, "../") != NULL) - LOG_RULE_WARNING("direct reference to parent sysfs directory, may break in future kernels; please fix"); - rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr); - - } else if (streq(key, "TAGS")) { - if (op > OP_MATCH_MAX) - LOG_AND_RETURN("invalid %s operation", key); - - rule_add_key(&rule_tmp, TK_M_TAGS, op, value, NULL); - - } else if (startswith(key, "ENV{")) { - attr = get_key_attribute(rules->udev, key + strlen("ENV")); - if (attr == NULL) - LOG_AND_RETURN("error parsing %s attribute", "ENV"); - - if (op == OP_REMOVE) - LOG_AND_RETURN("invalid %s operation", "ENV"); - - if (op < OP_MATCH_MAX) - rule_add_key(&rule_tmp, TK_M_ENV, op, value, attr); - else { - if (STR_IN_SET(attr, - "ACTION", - "SUBSYSTEM", - "DEVTYPE", - "MAJOR", - "MINOR", - "DRIVER", - "IFINDEX", - "DEVNAME", - "DEVLINKS", - "DEVPATH", - "TAGS")) - LOG_AND_RETURN("invalid ENV attribute, '%s' cannot be set", attr); - - rule_add_key(&rule_tmp, TK_A_ENV, op, value, attr); - } - - } else if (streq(key, "TAG")) { - if (op < OP_MATCH_MAX) - rule_add_key(&rule_tmp, TK_M_TAG, op, value, NULL); - else - rule_add_key(&rule_tmp, TK_A_TAG, op, value, NULL); - - } else if (streq(key, "PROGRAM")) { - if (op == OP_REMOVE) - LOG_AND_RETURN("invalid %s operation", key); - - rule_add_key(&rule_tmp, TK_M_PROGRAM, op, value, NULL); - - } else if (streq(key, "RESULT")) { - if (op > OP_MATCH_MAX) - LOG_AND_RETURN("invalid %s operation", key); - - rule_add_key(&rule_tmp, TK_M_RESULT, op, value, NULL); - - } else if (startswith(key, "IMPORT")) { - attr = get_key_attribute(rules->udev, key + strlen("IMPORT")); - if (attr == NULL) { - LOG_RULE_WARNING("ignoring IMPORT{} with missing type"); - continue; - } - if (op == OP_REMOVE) - LOG_AND_RETURN("invalid %s operation", "IMPORT"); - - if (streq(attr, "program")) { - /* find known built-in command */ - if (value[0] != '/') { - const enum udev_builtin_cmd cmd = udev_builtin_lookup(value); - - if (cmd < UDEV_BUILTIN_MAX) { - LOG_RULE_DEBUG("IMPORT found builtin '%s', replacing", value); - rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, value, &cmd); - continue; - } - } - rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL); - } else if (streq(attr, "builtin")) { - const enum udev_builtin_cmd cmd = udev_builtin_lookup(value); - - if (cmd >= UDEV_BUILTIN_MAX) - LOG_RULE_WARNING("IMPORT{builtin} '%s' unknown", value); - else - rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, value, &cmd); - } else if (streq(attr, "file")) - rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL); - else if (streq(attr, "db")) - rule_add_key(&rule_tmp, TK_M_IMPORT_DB, op, value, NULL); - else if (streq(attr, "cmdline")) - rule_add_key(&rule_tmp, TK_M_IMPORT_CMDLINE, op, value, NULL); - else if (streq(attr, "parent")) - rule_add_key(&rule_tmp, TK_M_IMPORT_PARENT, op, value, NULL); - else - LOG_RULE_ERROR("ignoring unknown %s{} type '%s'", "IMPORT", attr); - - } else if (startswith(key, "TEST")) { - mode_t mode = 0; - - if (op > OP_MATCH_MAX) - LOG_AND_RETURN("invalid %s operation", "TEST"); - - attr = get_key_attribute(rules->udev, key + strlen("TEST")); - if (attr != NULL) { - mode = strtol(attr, NULL, 8); - rule_add_key(&rule_tmp, TK_M_TEST, op, value, &mode); - } else - rule_add_key(&rule_tmp, TK_M_TEST, op, value, NULL); - - } else if (startswith(key, "RUN")) { - attr = get_key_attribute(rules->udev, key + strlen("RUN")); - if (attr == NULL) - attr = "program"; - if (op == OP_REMOVE) - LOG_AND_RETURN("invalid %s operation", "RUN"); - - if (streq(attr, "builtin")) { - const enum udev_builtin_cmd cmd = udev_builtin_lookup(value); - - if (cmd < UDEV_BUILTIN_MAX) - rule_add_key(&rule_tmp, TK_A_RUN_BUILTIN, op, value, &cmd); - else - LOG_RULE_ERROR("RUN{builtin}: '%s' unknown", value); - } else if (streq(attr, "program")) { - const enum udev_builtin_cmd cmd = UDEV_BUILTIN_MAX; - - rule_add_key(&rule_tmp, TK_A_RUN_PROGRAM, op, value, &cmd); - } else - LOG_RULE_ERROR("ignoring unknown %s{} type '%s'", "RUN", attr); - - } else if (streq(key, "LABEL")) { - if (op == OP_REMOVE) - LOG_AND_RETURN("invalid %s operation", key); - - rule_tmp.rule.rule.label_off = rules_add_string(rules, value); - - } else if (streq(key, "GOTO")) { - if (op == OP_REMOVE) - LOG_AND_RETURN("invalid %s operation", key); - - rule_add_key(&rule_tmp, TK_A_GOTO, 0, value, NULL); - - } else if (startswith(key, "NAME")) { - if (op == OP_REMOVE) - LOG_AND_RETURN("invalid %s operation", key); - - if (op < OP_MATCH_MAX) - rule_add_key(&rule_tmp, TK_M_NAME, op, value, NULL); - else { - if (streq(value, "%k")) { - LOG_RULE_WARNING("NAME=\"%%k\" is ignored, because it breaks kernel supplied names; please remove"); - continue; - } - if (isempty(value)) { - LOG_RULE_DEBUG("NAME=\"\" is ignored, because udev will not delete any device nodes; please remove"); - continue; - } - rule_add_key(&rule_tmp, TK_A_NAME, op, value, NULL); - } - rule_tmp.rule.rule.can_set_name = true; - - } else if (streq(key, "SYMLINK")) { - if (op == OP_REMOVE) - LOG_AND_RETURN("invalid %s operation", key); - - if (op < OP_MATCH_MAX) - rule_add_key(&rule_tmp, TK_M_DEVLINK, op, value, NULL); - else - rule_add_key(&rule_tmp, TK_A_DEVLINK, op, value, NULL); - rule_tmp.rule.rule.can_set_name = true; - - } else if (streq(key, "OWNER")) { - uid_t uid; - char *endptr; - - if (op == OP_REMOVE) - LOG_AND_RETURN("invalid %s operation", key); - - uid = strtoul(value, &endptr, 10); - if (endptr[0] == '\0') - rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid); - else if (rules->resolve_names > 0 && strchr("$%", value[0]) == NULL) { - uid = add_uid(rules, value); - rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid); - } else if (rules->resolve_names >= 0) - rule_add_key(&rule_tmp, TK_A_OWNER, op, value, NULL); - - rule_tmp.rule.rule.can_set_name = true; - - } else if (streq(key, "GROUP")) { - gid_t gid; - char *endptr; - - if (op == OP_REMOVE) - LOG_AND_RETURN("invalid %s operation", key); - - gid = strtoul(value, &endptr, 10); - if (endptr[0] == '\0') - rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid); - else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) { - gid = add_gid(rules, value); - rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid); - } else if (rules->resolve_names >= 0) - rule_add_key(&rule_tmp, TK_A_GROUP, op, value, NULL); - - rule_tmp.rule.rule.can_set_name = true; - - } else if (streq(key, "MODE")) { - mode_t mode; - char *endptr; - - if (op == OP_REMOVE) - LOG_AND_RETURN("invalid %s operation", key); - - mode = strtol(value, &endptr, 8); - if (endptr[0] == '\0') - rule_add_key(&rule_tmp, TK_A_MODE_ID, op, NULL, &mode); - else - rule_add_key(&rule_tmp, TK_A_MODE, op, value, NULL); - rule_tmp.rule.rule.can_set_name = true; - - } else if (streq(key, "OPTIONS")) { - const char *pos; - - if (op == OP_REMOVE) - LOG_AND_RETURN("invalid %s operation", key); - - pos = strstr(value, "link_priority="); - if (pos != NULL) { - int prio = atoi(pos + strlen("link_priority=")); - - rule_add_key(&rule_tmp, TK_A_DEVLINK_PRIO, op, NULL, &prio); - } - - pos = strstr(value, "string_escape="); - if (pos != NULL) { - pos += strlen("string_escape="); - if (startswith(pos, "none")) - rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_NONE, op, NULL, NULL); - else if (startswith(pos, "replace")) - rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_REPLACE, op, NULL, NULL); - } - - pos = strstr(value, "db_persist"); - if (pos != NULL) - rule_add_key(&rule_tmp, TK_A_DB_PERSIST, op, NULL, NULL); - - pos = strstr(value, "nowatch"); - if (pos != NULL) { - const int off = 0; - - rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &off); - } else { - pos = strstr(value, "watch"); - if (pos != NULL) { - const int on = 1; - - rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &on); - } - } - - pos = strstr(value, "static_node="); - if (pos != NULL) { - pos += strlen("static_node="); - rule_add_key(&rule_tmp, TK_A_STATIC_NODE, op, pos, NULL); - rule_tmp.rule.rule.has_static_node = true; - } - - } else - LOG_AND_RETURN("unknown key '%s'", key); - } - - /* add rule token and sort tokens */ - rule_tmp.rule.rule.token_count = 1 + rule_tmp.token_cur; - if (add_token(rules, &rule_tmp.rule) != 0 || sort_token(rules, &rule_tmp) != 0) - LOG_RULE_ERROR("failed to add rule token"); -} - -static int parse_file(struct udev_rules *rules, const char *filename) { - _cleanup_fclose_ FILE *f = NULL; - unsigned int first_token; - unsigned int filename_off; - char line[UTIL_LINE_SIZE]; - int line_nr = 0; - unsigned int i; - - f = fopen(filename, "re"); - if (!f) { - if (errno == ENOENT) - return 0; - else - return -errno; - } - - if (null_or_empty_fd(fileno(f))) { - log_debug("Skipping empty file: %s", filename); - return 0; - } else - log_debug("Reading rules file: %s", filename); - - first_token = rules->token_cur; - filename_off = rules_add_string(rules, filename); - - while (fgets(line, sizeof(line), f) != NULL) { - char *key; - size_t len; - - /* skip whitespace */ - line_nr++; - key = line; - while (isspace(key[0])) - key++; - - /* comment */ - if (key[0] == '#') - continue; - - len = strlen(line); - if (len < 3) - continue; - - /* continue reading if backslash+newline is found */ - while (line[len-2] == '\\') { - if (fgets(&line[len-2], (sizeof(line)-len)+2, f) == NULL) - break; - if (strlen(&line[len-2]) < 2) - break; - line_nr++; - len = strlen(line); - } - - if (len+1 >= sizeof(line)) { - log_error("line too long '%s':%u, ignored", filename, line_nr); - continue; - } - add_rule(rules, key, filename, filename_off, line_nr); - } - - /* link GOTOs to LABEL rules in this file to be able to fast-forward */ - for (i = first_token+1; i < rules->token_cur; i++) { - if (rules->tokens[i].type == TK_A_GOTO) { - char *label = rules_str(rules, rules->tokens[i].key.value_off); - unsigned int j; - - for (j = i+1; j < rules->token_cur; j++) { - if (rules->tokens[j].type != TK_RULE) - continue; - if (rules->tokens[j].rule.label_off == 0) - continue; - if (!streq(label, rules_str(rules, rules->tokens[j].rule.label_off))) - continue; - rules->tokens[i].key.rule_goto = j; - break; - } - if (rules->tokens[i].key.rule_goto == 0) - log_error("GOTO '%s' has no matching label in: '%s'", label, filename); - } - } - return 0; -} - -struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names) { - struct udev_rules *rules; - struct udev_list file_list; - struct token end_token; - char **files, **f; - int r; - - rules = new0(struct udev_rules, 1); - if (rules == NULL) - return NULL; - rules->udev = udev; - rules->resolve_names = resolve_names; - udev_list_init(udev, &file_list, true); - - /* init token array and string buffer */ - rules->tokens = malloc(PREALLOC_TOKEN * sizeof(struct token)); - if (rules->tokens == NULL) - return udev_rules_unref(rules); - rules->token_max = PREALLOC_TOKEN; - - rules->strbuf = strbuf_new(); - if (!rules->strbuf) - return udev_rules_unref(rules); - - udev_rules_check_timestamp(rules); - - r = conf_files_list_strv(&files, ".rules", NULL, rules_dirs); - if (r < 0) { - log_error_errno(r, "failed to enumerate rules files: %m"); - return udev_rules_unref(rules); - } - - /* - * The offset value in the rules strct is limited; add all - * rules file names to the beginning of the string buffer. - */ - STRV_FOREACH(f, files) - rules_add_string(rules, *f); - - STRV_FOREACH(f, files) - parse_file(rules, *f); - - strv_free(files); - - memzero(&end_token, sizeof(struct token)); - end_token.type = TK_END; - add_token(rules, &end_token); - log_debug("rules contain %zu bytes tokens (%u * %zu bytes), %zu bytes strings", - rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->strbuf->len); - - /* cleanup temporary strbuf data */ - log_debug("%zu strings (%zu bytes), %zu de-duplicated (%zu bytes), %zu trie nodes used", - rules->strbuf->in_count, rules->strbuf->in_len, - rules->strbuf->dedup_count, rules->strbuf->dedup_len, rules->strbuf->nodes_count); - strbuf_complete(rules->strbuf); - - /* cleanup uid/gid cache */ - rules->uids = mfree(rules->uids); - rules->uids_cur = 0; - rules->uids_max = 0; - rules->gids = mfree(rules->gids); - rules->gids_cur = 0; - rules->gids_max = 0; - - dump_rules(rules); - return rules; -} - -struct udev_rules *udev_rules_unref(struct udev_rules *rules) { - if (rules == NULL) - return NULL; - free(rules->tokens); - strbuf_cleanup(rules->strbuf); - free(rules->uids); - free(rules->gids); - free(rules); - return NULL; -} - -bool udev_rules_check_timestamp(struct udev_rules *rules) { - if (!rules) - return false; - - return paths_check_timestamp(rules_dirs, &rules->dirs_ts_usec, true); -} - -static int match_key(struct udev_rules *rules, struct token *token, const char *val) { - char *key_value = rules_str(rules, token->key.value_off); - char *pos; - bool match = false; - - if (val == NULL) - val = ""; - - switch (token->key.glob) { - case GL_PLAIN: - match = (streq(key_value, val)); - break; - case GL_GLOB: - match = (fnmatch(key_value, val, 0) == 0); - break; - case GL_SPLIT: - { - const char *s; - size_t len; - - s = rules_str(rules, token->key.value_off); - len = strlen(val); - for (;;) { - const char *next; - - next = strchr(s, '|'); - if (next != NULL) { - size_t matchlen = (size_t)(next - s); - - match = (matchlen == len && strneq(s, val, matchlen)); - if (match) - break; - } else { - match = (streq(s, val)); - break; - } - s = &next[1]; - } - break; - } - case GL_SPLIT_GLOB: - { - char value[UTIL_PATH_SIZE]; - - strscpy(value, sizeof(value), rules_str(rules, token->key.value_off)); - key_value = value; - while (key_value != NULL) { - pos = strchr(key_value, '|'); - if (pos != NULL) { - pos[0] = '\0'; - pos = &pos[1]; - } - match = (fnmatch(key_value, val, 0) == 0); - if (match) - break; - key_value = pos; - } - break; - } - case GL_SOMETHING: - match = (val[0] != '\0'); - break; - case GL_UNSET: - return -1; - } - - if (match && (token->key.op == OP_MATCH)) - return 0; - if (!match && (token->key.op == OP_NOMATCH)) - return 0; - return -1; -} - -static int match_attr(struct udev_rules *rules, struct udev_device *dev, struct udev_event *event, struct token *cur) { - const char *name; - char nbuf[UTIL_NAME_SIZE]; - const char *value; - char vbuf[UTIL_NAME_SIZE]; - size_t len; - - name = rules_str(rules, cur->key.attr_off); - switch (cur->key.attrsubst) { - case SB_FORMAT: - udev_event_apply_format(event, name, nbuf, sizeof(nbuf)); - name = nbuf; - /* fall through */ - case SB_NONE: - value = udev_device_get_sysattr_value(dev, name); - if (value == NULL) - return -1; - break; - case SB_SUBSYS: - if (util_resolve_subsys_kernel(event->udev, name, vbuf, sizeof(vbuf), 1) != 0) - return -1; - value = vbuf; - break; - default: - return -1; - } - - /* remove trailing whitespace, if not asked to match for it */ - len = strlen(value); - if (len > 0 && isspace(value[len-1])) { - const char *key_value; - size_t klen; - - key_value = rules_str(rules, cur->key.value_off); - klen = strlen(key_value); - if (klen > 0 && !isspace(key_value[klen-1])) { - if (value != vbuf) { - strscpy(vbuf, sizeof(vbuf), value); - value = vbuf; - } - while (len > 0 && isspace(vbuf[--len])) - vbuf[len] = '\0'; - } - } - - return match_key(rules, cur, value); -} - -enum escape_type { - ESCAPE_UNSET, - ESCAPE_NONE, - ESCAPE_REPLACE, -}; - -void udev_rules_apply_to_event(struct udev_rules *rules, - struct udev_event *event, - usec_t timeout_usec, - usec_t timeout_warn_usec, - struct udev_list *properties_list) { - struct token *cur; - struct token *rule; - enum escape_type esc = ESCAPE_UNSET; - bool can_set_name; - - if (rules->tokens == NULL) - return; - - can_set_name = ((!streq(udev_device_get_action(event->dev), "remove")) && - (major(udev_device_get_devnum(event->dev)) > 0 || - udev_device_get_ifindex(event->dev) > 0)); - - /* loop through token list, match, run actions or forward to next rule */ - cur = &rules->tokens[0]; - rule = cur; - for (;;) { - dump_token(rules, cur); - switch (cur->type) { - case TK_RULE: - /* current rule */ - rule = cur; - /* possibly skip rules which want to set NAME, SYMLINK, OWNER, GROUP, MODE */ - if (!can_set_name && rule->rule.can_set_name) - goto nomatch; - esc = ESCAPE_UNSET; - break; - case TK_M_ACTION: - if (match_key(rules, cur, udev_device_get_action(event->dev)) != 0) - goto nomatch; - break; - case TK_M_DEVPATH: - if (match_key(rules, cur, udev_device_get_devpath(event->dev)) != 0) - goto nomatch; - break; - case TK_M_KERNEL: - if (match_key(rules, cur, udev_device_get_sysname(event->dev)) != 0) - goto nomatch; - break; - case TK_M_DEVLINK: { - struct udev_list_entry *list_entry; - bool match = false; - - udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(event->dev)) { - const char *devlink; - - devlink = udev_list_entry_get_name(list_entry) + strlen("/dev/"); - if (match_key(rules, cur, devlink) == 0) { - match = true; - break; - } - } - if (!match) - goto nomatch; - break; - } - case TK_M_NAME: - if (match_key(rules, cur, event->name) != 0) - goto nomatch; - break; - case TK_M_ENV: { - const char *key_name = rules_str(rules, cur->key.attr_off); - const char *value; - - value = udev_device_get_property_value(event->dev, key_name); - - /* check global properties */ - if (!value && properties_list) { - struct udev_list_entry *list_entry; - - list_entry = udev_list_get_entry(properties_list); - list_entry = udev_list_entry_get_by_name(list_entry, key_name); - if (list_entry != NULL) - value = udev_list_entry_get_value(list_entry); - } - - if (!value) - value = ""; - if (match_key(rules, cur, value)) - goto nomatch; - break; - } - case TK_M_TAG: { - struct udev_list_entry *list_entry; - bool match = false; - - udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(event->dev)) { - if (streq(rules_str(rules, cur->key.value_off), udev_list_entry_get_name(list_entry))) { - match = true; - break; - } - } - if ((!match && (cur->key.op != OP_NOMATCH)) || - (match && (cur->key.op == OP_NOMATCH))) - goto nomatch; - break; - } - case TK_M_SUBSYSTEM: - if (match_key(rules, cur, udev_device_get_subsystem(event->dev)) != 0) - goto nomatch; - break; - case TK_M_DRIVER: - if (match_key(rules, cur, udev_device_get_driver(event->dev)) != 0) - goto nomatch; - break; - case TK_M_ATTR: - if (match_attr(rules, event->dev, event, cur) != 0) - goto nomatch; - break; - case TK_M_SYSCTL: { - char filename[UTIL_PATH_SIZE]; - _cleanup_free_ char *value = NULL; - size_t len; - - udev_event_apply_format(event, rules_str(rules, cur->key.attr_off), filename, sizeof(filename)); - sysctl_normalize(filename); - if (sysctl_read(filename, &value) < 0) - goto nomatch; - - len = strlen(value); - while (len > 0 && isspace(value[--len])) - value[len] = '\0'; - if (match_key(rules, cur, value) != 0) - goto nomatch; - break; - } - case TK_M_KERNELS: - case TK_M_SUBSYSTEMS: - case TK_M_DRIVERS: - case TK_M_ATTRS: - case TK_M_TAGS: { - struct token *next; - - /* get whole sequence of parent matches */ - next = cur; - while (next->type > TK_M_PARENTS_MIN && next->type < TK_M_PARENTS_MAX) - next++; - - /* loop over parents */ - event->dev_parent = event->dev; - for (;;) { - struct token *key; - - /* loop over sequence of parent match keys */ - for (key = cur; key < next; key++ ) { - dump_token(rules, key); - switch(key->type) { - case TK_M_KERNELS: - if (match_key(rules, key, udev_device_get_sysname(event->dev_parent)) != 0) - goto try_parent; - break; - case TK_M_SUBSYSTEMS: - if (match_key(rules, key, udev_device_get_subsystem(event->dev_parent)) != 0) - goto try_parent; - break; - case TK_M_DRIVERS: - if (match_key(rules, key, udev_device_get_driver(event->dev_parent)) != 0) - goto try_parent; - break; - case TK_M_ATTRS: - if (match_attr(rules, event->dev_parent, event, key) != 0) - goto try_parent; - break; - case TK_M_TAGS: { - bool match = udev_device_has_tag(event->dev_parent, rules_str(rules, cur->key.value_off)); - - if (match && key->key.op == OP_NOMATCH) - goto try_parent; - if (!match && key->key.op == OP_MATCH) - goto try_parent; - break; - } - default: - goto nomatch; - } - } - break; - - try_parent: - event->dev_parent = udev_device_get_parent(event->dev_parent); - if (event->dev_parent == NULL) - goto nomatch; - } - /* move behind our sequence of parent match keys */ - cur = next; - continue; - } - case TK_M_TEST: { - char filename[UTIL_PATH_SIZE]; - struct stat statbuf; - int match; - - udev_event_apply_format(event, rules_str(rules, cur->key.value_off), filename, sizeof(filename)); - if (util_resolve_subsys_kernel(event->udev, filename, filename, sizeof(filename), 0) != 0) { - if (filename[0] != '/') { - char tmp[UTIL_PATH_SIZE]; - - strscpy(tmp, sizeof(tmp), filename); - strscpyl(filename, sizeof(filename), - udev_device_get_syspath(event->dev), "/", tmp, NULL); - } - } - attr_subst_subdir(filename, sizeof(filename)); - - match = (stat(filename, &statbuf) == 0); - if (match && cur->key.mode > 0) - match = ((statbuf.st_mode & cur->key.mode) > 0); - if (match && cur->key.op == OP_NOMATCH) - goto nomatch; - if (!match && cur->key.op == OP_MATCH) - goto nomatch; - break; - } - case TK_M_PROGRAM: { - char program[UTIL_PATH_SIZE]; - char result[UTIL_LINE_SIZE]; - - event->program_result = mfree(event->program_result); - udev_event_apply_format(event, rules_str(rules, cur->key.value_off), program, sizeof(program)); - log_debug("PROGRAM '%s' %s:%u", - program, - rules_str(rules, rule->rule.filename_off), - rule->rule.filename_line); - - if (udev_event_spawn(event, timeout_usec, timeout_warn_usec, true, program, result, sizeof(result)) < 0) { - if (cur->key.op != OP_NOMATCH) - goto nomatch; - } else { - int count; - - util_remove_trailing_chars(result, '\n'); - if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) { - count = util_replace_chars(result, UDEV_ALLOWED_CHARS_INPUT); - if (count > 0) - log_debug("%i character(s) replaced" , count); - } - event->program_result = strdup(result); - if (cur->key.op == OP_NOMATCH) - goto nomatch; - } - break; - } - case TK_M_IMPORT_FILE: { - char import[UTIL_PATH_SIZE]; - - udev_event_apply_format(event, rules_str(rules, cur->key.value_off), import, sizeof(import)); - if (import_file_into_properties(event->dev, import) != 0) - if (cur->key.op != OP_NOMATCH) - goto nomatch; - break; - } - case TK_M_IMPORT_PROG: { - char import[UTIL_PATH_SIZE]; - - udev_event_apply_format(event, rules_str(rules, cur->key.value_off), import, sizeof(import)); - log_debug("IMPORT '%s' %s:%u", - import, - rules_str(rules, rule->rule.filename_off), - rule->rule.filename_line); - - if (import_program_into_properties(event, timeout_usec, timeout_warn_usec, import) != 0) - if (cur->key.op != OP_NOMATCH) - goto nomatch; - break; - } - case TK_M_IMPORT_BUILTIN: { - char command[UTIL_PATH_SIZE]; - - if (udev_builtin_run_once(cur->key.builtin_cmd)) { - /* check if we ran already */ - if (event->builtin_run & (1 << cur->key.builtin_cmd)) { - log_debug("IMPORT builtin skip '%s' %s:%u", - udev_builtin_name(cur->key.builtin_cmd), - rules_str(rules, rule->rule.filename_off), - rule->rule.filename_line); - /* return the result from earlier run */ - if (event->builtin_ret & (1 << cur->key.builtin_cmd)) - if (cur->key.op != OP_NOMATCH) - goto nomatch; - break; - } - /* mark as ran */ - event->builtin_run |= (1 << cur->key.builtin_cmd); - } - - udev_event_apply_format(event, rules_str(rules, cur->key.value_off), command, sizeof(command)); - log_debug("IMPORT builtin '%s' %s:%u", - udev_builtin_name(cur->key.builtin_cmd), - rules_str(rules, rule->rule.filename_off), - rule->rule.filename_line); - - if (udev_builtin_run(event->dev, cur->key.builtin_cmd, command, false) != 0) { - /* remember failure */ - log_debug("IMPORT builtin '%s' returned non-zero", - udev_builtin_name(cur->key.builtin_cmd)); - event->builtin_ret |= (1 << cur->key.builtin_cmd); - if (cur->key.op != OP_NOMATCH) - goto nomatch; - } - break; - } - case TK_M_IMPORT_DB: { - const char *key = rules_str(rules, cur->key.value_off); - const char *value; - - value = udev_device_get_property_value(event->dev_db, key); - if (value != NULL) - udev_device_add_property(event->dev, key, value); - else { - if (cur->key.op != OP_NOMATCH) - goto nomatch; - } - break; - } - case TK_M_IMPORT_CMDLINE: { - _cleanup_fclose_ FILE *f = NULL; - bool imported = false; - - f = fopen("/proc/cmdline", "re"); - if (f != NULL) { - char cmdline[4096]; - - if (fgets(cmdline, sizeof(cmdline), f) != NULL) { - const char *key = rules_str(rules, cur->key.value_off); - char *pos; - - pos = strstr(cmdline, key); - if (pos != NULL) { - imported = true; - pos += strlen(key); - if (pos[0] == '\0' || isspace(pos[0])) - /* we import simple flags as 'FLAG=1' */ - udev_device_add_property(event->dev, key, "1"); - else if (pos[0] == '=') { - const char *value; - - pos++; - value = pos; - while (pos[0] != '\0' && !isspace(pos[0])) - pos++; - pos[0] = '\0'; - udev_device_add_property(event->dev, key, value); - } - } - } - } - if (!imported && cur->key.op != OP_NOMATCH) - goto nomatch; - break; - } - case TK_M_IMPORT_PARENT: { - char import[UTIL_PATH_SIZE]; - - udev_event_apply_format(event, rules_str(rules, cur->key.value_off), import, sizeof(import)); - if (import_parent_into_properties(event->dev, import) != 0) - if (cur->key.op != OP_NOMATCH) - goto nomatch; - break; - } - case TK_M_RESULT: - if (match_key(rules, cur, event->program_result) != 0) - goto nomatch; - break; - case TK_A_STRING_ESCAPE_NONE: - esc = ESCAPE_NONE; - break; - case TK_A_STRING_ESCAPE_REPLACE: - esc = ESCAPE_REPLACE; - break; - case TK_A_DB_PERSIST: - udev_device_set_db_persist(event->dev); - break; - case TK_A_INOTIFY_WATCH: - if (event->inotify_watch_final) - break; - if (cur->key.op == OP_ASSIGN_FINAL) - event->inotify_watch_final = true; - event->inotify_watch = cur->key.watch; - break; - case TK_A_DEVLINK_PRIO: - udev_device_set_devlink_priority(event->dev, cur->key.devlink_prio); - break; - case TK_A_OWNER: { - char owner[UTIL_NAME_SIZE]; - const char *ow = owner; - int r; - - if (event->owner_final) - break; - if (cur->key.op == OP_ASSIGN_FINAL) - event->owner_final = true; - udev_event_apply_format(event, rules_str(rules, cur->key.value_off), owner, sizeof(owner)); - event->owner_set = true; - r = get_user_creds(&ow, &event->uid, NULL, NULL, NULL); - if (r < 0) { - if (r == -ENOENT || r == -ESRCH) - log_error("specified user '%s' unknown", owner); - else - log_error_errno(r, "error resolving user '%s': %m", owner); - - event->uid = 0; - } - log_debug("OWNER %u %s:%u", - event->uid, - rules_str(rules, rule->rule.filename_off), - rule->rule.filename_line); - break; - } - case TK_A_GROUP: { - char group[UTIL_NAME_SIZE]; - const char *gr = group; - int r; - - if (event->group_final) - break; - if (cur->key.op == OP_ASSIGN_FINAL) - event->group_final = true; - udev_event_apply_format(event, rules_str(rules, cur->key.value_off), group, sizeof(group)); - event->group_set = true; - r = get_group_creds(&gr, &event->gid); - if (r < 0) { - if (r == -ENOENT || r == -ESRCH) - log_error("specified group '%s' unknown", group); - else - log_error_errno(r, "error resolving group '%s': %m", group); - - event->gid = 0; - } - log_debug("GROUP %u %s:%u", - event->gid, - rules_str(rules, rule->rule.filename_off), - rule->rule.filename_line); - break; - } - case TK_A_MODE: { - char mode_str[UTIL_NAME_SIZE]; - mode_t mode; - char *endptr; - - if (event->mode_final) - break; - udev_event_apply_format(event, rules_str(rules, cur->key.value_off), mode_str, sizeof(mode_str)); - mode = strtol(mode_str, &endptr, 8); - if (endptr[0] != '\0') { - log_error("ignoring invalid mode '%s'", mode_str); - break; - } - if (cur->key.op == OP_ASSIGN_FINAL) - event->mode_final = true; - event->mode_set = true; - event->mode = mode; - log_debug("MODE %#o %s:%u", - event->mode, - rules_str(rules, rule->rule.filename_off), - rule->rule.filename_line); - break; - } - case TK_A_OWNER_ID: - if (event->owner_final) - break; - if (cur->key.op == OP_ASSIGN_FINAL) - event->owner_final = true; - event->owner_set = true; - event->uid = cur->key.uid; - log_debug("OWNER %u %s:%u", - event->uid, - rules_str(rules, rule->rule.filename_off), - rule->rule.filename_line); - break; - case TK_A_GROUP_ID: - if (event->group_final) - break; - if (cur->key.op == OP_ASSIGN_FINAL) - event->group_final = true; - event->group_set = true; - event->gid = cur->key.gid; - log_debug("GROUP %u %s:%u", - event->gid, - rules_str(rules, rule->rule.filename_off), - rule->rule.filename_line); - break; - case TK_A_MODE_ID: - if (event->mode_final) - break; - if (cur->key.op == OP_ASSIGN_FINAL) - event->mode_final = true; - event->mode_set = true; - event->mode = cur->key.mode; - log_debug("MODE %#o %s:%u", - event->mode, - rules_str(rules, rule->rule.filename_off), - rule->rule.filename_line); - break; - case TK_A_SECLABEL: { - const char *name, *label; - - name = rules_str(rules, cur->key.attr_off); - label = rules_str(rules, cur->key.value_off); - if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL) - udev_list_cleanup(&event->seclabel_list); - udev_list_entry_add(&event->seclabel_list, name, label); - log_debug("SECLABEL{%s}='%s' %s:%u", - name, label, - rules_str(rules, rule->rule.filename_off), - rule->rule.filename_line); - break; - } - case TK_A_ENV: { - const char *name = rules_str(rules, cur->key.attr_off); - char *value = rules_str(rules, cur->key.value_off); - char value_new[UTIL_NAME_SIZE]; - const char *value_old = NULL; - - if (value[0] == '\0') { - if (cur->key.op == OP_ADD) - break; - udev_device_add_property(event->dev, name, NULL); - break; - } - - if (cur->key.op == OP_ADD) - value_old = udev_device_get_property_value(event->dev, name); - if (value_old) { - char temp[UTIL_NAME_SIZE]; - - /* append value separated by space */ - udev_event_apply_format(event, value, temp, sizeof(temp)); - strscpyl(value_new, sizeof(value_new), value_old, " ", temp, NULL); - } else - udev_event_apply_format(event, value, value_new, sizeof(value_new)); - - udev_device_add_property(event->dev, name, value_new); - break; - } - case TK_A_TAG: { - char tag[UTIL_PATH_SIZE]; - const char *p; - - udev_event_apply_format(event, rules_str(rules, cur->key.value_off), tag, sizeof(tag)); - if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL) - udev_device_cleanup_tags_list(event->dev); - for (p = tag; *p != '\0'; p++) { - if ((*p >= 'a' && *p <= 'z') || - (*p >= 'A' && *p <= 'Z') || - (*p >= '0' && *p <= '9') || - *p == '-' || *p == '_') - continue; - log_error("ignoring invalid tag name '%s'", tag); - break; - } - if (cur->key.op == OP_REMOVE) - udev_device_remove_tag(event->dev, tag); - else - udev_device_add_tag(event->dev, tag); - break; - } - case TK_A_NAME: { - const char *name = rules_str(rules, cur->key.value_off); - - char name_str[UTIL_PATH_SIZE]; - int count; - - if (event->name_final) - break; - if (cur->key.op == OP_ASSIGN_FINAL) - event->name_final = true; - udev_event_apply_format(event, name, name_str, sizeof(name_str)); - if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) { - count = util_replace_chars(name_str, "/"); - if (count > 0) - log_debug("%i character(s) replaced", count); - } - if (major(udev_device_get_devnum(event->dev)) && - !streq(name_str, udev_device_get_devnode(event->dev) + strlen("/dev/"))) { - log_error("NAME=\"%s\" ignored, kernel device nodes cannot be renamed; please fix it in %s:%u\n", - name, - rules_str(rules, rule->rule.filename_off), - rule->rule.filename_line); - break; - } - if (free_and_strdup(&event->name, name_str) < 0) { - log_oom(); - return; - } - log_debug("NAME '%s' %s:%u", - event->name, - rules_str(rules, rule->rule.filename_off), - rule->rule.filename_line); - break; - } - case TK_A_DEVLINK: { - char temp[UTIL_PATH_SIZE]; - char filename[UTIL_PATH_SIZE]; - char *pos, *next; - int count = 0; - - if (event->devlink_final) - break; - if (major(udev_device_get_devnum(event->dev)) == 0) - break; - if (cur->key.op == OP_ASSIGN_FINAL) - event->devlink_final = true; - if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL) - udev_device_cleanup_devlinks_list(event->dev); - - /* allow multiple symlinks separated by spaces */ - udev_event_apply_format(event, rules_str(rules, cur->key.value_off), temp, sizeof(temp)); - if (esc == ESCAPE_UNSET) - count = util_replace_chars(temp, "/ "); - else if (esc == ESCAPE_REPLACE) - count = util_replace_chars(temp, "/"); - if (count > 0) - log_debug("%i character(s) replaced" , count); - pos = temp; - while (isspace(pos[0])) - pos++; - next = strchr(pos, ' '); - while (next != NULL) { - next[0] = '\0'; - log_debug("LINK '%s' %s:%u", pos, - rules_str(rules, rule->rule.filename_off), rule->rule.filename_line); - strscpyl(filename, sizeof(filename), "/dev/", pos, NULL); - udev_device_add_devlink(event->dev, filename); - while (isspace(next[1])) - next++; - pos = &next[1]; - next = strchr(pos, ' '); - } - if (pos[0] != '\0') { - log_debug("LINK '%s' %s:%u", pos, - rules_str(rules, rule->rule.filename_off), rule->rule.filename_line); - strscpyl(filename, sizeof(filename), "/dev/", pos, NULL); - udev_device_add_devlink(event->dev, filename); - } - break; - } - case TK_A_ATTR: { - const char *key_name = rules_str(rules, cur->key.attr_off); - char attr[UTIL_PATH_SIZE]; - char value[UTIL_NAME_SIZE]; - _cleanup_fclose_ FILE *f = NULL; - - if (util_resolve_subsys_kernel(event->udev, key_name, attr, sizeof(attr), 0) != 0) - strscpyl(attr, sizeof(attr), udev_device_get_syspath(event->dev), "/", key_name, NULL); - attr_subst_subdir(attr, sizeof(attr)); - - udev_event_apply_format(event, rules_str(rules, cur->key.value_off), value, sizeof(value)); - log_debug("ATTR '%s' writing '%s' %s:%u", attr, value, - rules_str(rules, rule->rule.filename_off), - rule->rule.filename_line); - f = fopen(attr, "we"); - if (f == NULL) - log_error_errno(errno, "error opening ATTR{%s} for writing: %m", attr); - else if (fprintf(f, "%s", value) <= 0) - log_error_errno(errno, "error writing ATTR{%s}: %m", attr); - break; - } - case TK_A_SYSCTL: { - char filename[UTIL_PATH_SIZE]; - char value[UTIL_NAME_SIZE]; - int r; - - udev_event_apply_format(event, rules_str(rules, cur->key.attr_off), filename, sizeof(filename)); - sysctl_normalize(filename); - udev_event_apply_format(event, rules_str(rules, cur->key.value_off), value, sizeof(value)); - log_debug("SYSCTL '%s' writing '%s' %s:%u", filename, value, - rules_str(rules, rule->rule.filename_off), rule->rule.filename_line); - r = sysctl_write(filename, value); - if (r < 0) - log_error_errno(r, "error writing SYSCTL{%s}='%s': %m", filename, value); - break; - } - case TK_A_RUN_BUILTIN: - case TK_A_RUN_PROGRAM: { - struct udev_list_entry *entry; - - if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL) - udev_list_cleanup(&event->run_list); - log_debug("RUN '%s' %s:%u", - rules_str(rules, cur->key.value_off), - rules_str(rules, rule->rule.filename_off), - rule->rule.filename_line); - entry = udev_list_entry_add(&event->run_list, rules_str(rules, cur->key.value_off), NULL); - udev_list_entry_set_num(entry, cur->key.builtin_cmd); - break; - } - case TK_A_GOTO: - if (cur->key.rule_goto == 0) - break; - cur = &rules->tokens[cur->key.rule_goto]; - continue; - case TK_END: - return; - - case TK_M_PARENTS_MIN: - case TK_M_PARENTS_MAX: - case TK_M_MAX: - case TK_UNSET: - log_error("wrong type %u", cur->type); - goto nomatch; - } - - cur++; - continue; - nomatch: - /* fast-forward to next rule */ - cur = rule + rule->rule.token_count; - } -} - -int udev_rules_apply_static_dev_perms(struct udev_rules *rules) { - struct token *cur; - struct token *rule; - uid_t uid = 0; - gid_t gid = 0; - mode_t mode = 0; - _cleanup_strv_free_ char **tags = NULL; - char **t; - FILE *f = NULL; - _cleanup_free_ char *path = NULL; - int r; - - if (rules->tokens == NULL) - return 0; - - cur = &rules->tokens[0]; - rule = cur; - for (;;) { - switch (cur->type) { - case TK_RULE: - /* current rule */ - rule = cur; - - /* skip rules without a static_node tag */ - if (!rule->rule.has_static_node) - goto next; - - uid = 0; - gid = 0; - mode = 0; - tags = strv_free(tags); - break; - case TK_A_OWNER_ID: - uid = cur->key.uid; - break; - case TK_A_GROUP_ID: - gid = cur->key.gid; - break; - case TK_A_MODE_ID: - mode = cur->key.mode; - break; - case TK_A_TAG: - r = strv_extend(&tags, rules_str(rules, cur->key.value_off)); - if (r < 0) - goto finish; - - break; - case TK_A_STATIC_NODE: { - char device_node[UTIL_PATH_SIZE]; - char tags_dir[UTIL_PATH_SIZE]; - char tag_symlink[UTIL_PATH_SIZE]; - struct stat stats; - - /* we assure, that the permissions tokens are sorted before the static token */ - - if (mode == 0 && uid == 0 && gid == 0 && tags == NULL) - goto next; - - strscpyl(device_node, sizeof(device_node), "/dev/", rules_str(rules, cur->key.value_off), NULL); - if (stat(device_node, &stats) != 0) - break; - if (!S_ISBLK(stats.st_mode) && !S_ISCHR(stats.st_mode)) - break; - - /* export the tags to a directory as symlinks, allowing otherwise dead nodes to be tagged */ - if (tags) { - STRV_FOREACH(t, tags) { - _cleanup_free_ char *unescaped_filename = NULL; - - 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); - - unescaped_filename = xescape(rules_str(rules, cur->key.value_off), "/."); - - 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 (mode == 0 && uid == 0 && gid == 0) - break; - - if (mode == 0) { - if (gid > 0) - mode = 0660; - else - mode = 0600; - } - if (mode != (stats.st_mode & 01777)) { - r = chmod(device_node, mode); - if (r < 0) { - log_error("failed to chmod '%s' %#o", device_node, mode); - return -errno; - } else - log_debug("chmod '%s' %#o", device_node, mode); - } - - if ((uid != 0 && uid != stats.st_uid) || (gid != 0 && gid != stats.st_gid)) { - r = chown(device_node, uid, gid); - if (r < 0) { - log_error("failed to chown '%s' %u %u ", device_node, uid, gid); - return -errno; - } else - log_debug("chown '%s' %u %u", device_node, uid, gid); - } - - utimensat(AT_FDCWD, device_node, NULL, 0); - break; - } - case TK_END: - goto finish; - } - - cur++; - continue; -next: - /* fast-forward to next rule */ - cur = rule + rule->rule.token_count; - continue; - } - -finish: - if (f) { - fflush(f); - fchmod(fileno(f), 0644); - if (ferror(f) || rename(path, "/run/udev/static_node-tags") < 0) { - unlink_noerrno("/run/udev/static_node-tags"); - unlink_noerrno(path); - return -errno; - } - } - - return 0; -} |