/* * 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 <stddef.h> #include <limits.h> #include <stdlib.h> #include <stdbool.h> #include <string.h> #include <stdio.h> #include <fcntl.h> #include <ctype.h> #include <unistd.h> #include <errno.h> #include <dirent.h> #include <fnmatch.h> #include <time.h> #include "udev.h" #include "path-util.h" #include "conf-files.h" #include "strbuf.h" #include "strv.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:="" */ enum operation_type { OP_UNSET, OP_MATCH, OP_NOMATCH, OP_MATCH_MAX, OP_ADD, 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_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_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_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_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_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 = str(rules, token->key.value_off); const char *attr = &rules->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->buf[token->rule.filename_off], token->rule.filename_line, idx, token->rule.token_count, &rules->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_ATTRS: case TK_M_ENV: case TK_A_ATTR: 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, %u (%zu bytes) strings", rules->token_cur, rules->token_cur * sizeof(struct token), rules->buf_count, rules->buf_cur); 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; unsigned int off; /* 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; } } uid = util_lookup_user(rules->udev, 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; unsigned int off; /* 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; } } gid = util_lookup_group(rules->udev, 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; struct udev_list_entry *entry; /* 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++; } entry = udev_device_add_property(dev, key, val); /* store in db, skip private keys */ if (key[0] != '.') udev_list_entry_set_num(entry, true); 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, const char *program, const sigset_t *sigmask) { struct udev_device *dev = event->dev; char **envp; char result[UTIL_LINE_SIZE]; char *line; int err; envp = udev_device_get_properties_envp(dev); err = udev_event_spawn(event, timeout_usec, program, envp, sigmask, 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(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; 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) { struct udev_list_entry *entry; entry = udev_device_add_property(dev, key, val); /* store in db, skip private keys */ if (key[0] != '.') udev_list_entry_set_num(entry, true); } } return 0; } #define WAIT_LOOP_PER_SECOND 50 static int wait_for_file(struct udev_device *dev, const char *file, int timeout) { char filepath[UTIL_PATH_SIZE]; char devicepath[UTIL_PATH_SIZE]; struct stat stats; int loop = timeout * WAIT_LOOP_PER_SECOND; /* a relative path is a device attribute */ devicepath[0] = '\0'; if (file[0] != '/') { strscpyl(devicepath, sizeof(devicepath), udev_device_get_syspath(dev), NULL); strscpyl(filepath, sizeof(filepath), devicepath, "/", file, NULL); file = filepath; } while (--loop) { const struct timespec duration = { 0, 1000 * 1000 * 1000 / WAIT_LOOP_PER_SECOND }; /* lookup file */ if (stat(file, &stats) == 0) { log_debug("file '%s' appeared after %i loops", file, (timeout * WAIT_LOOP_PER_SECOND) - loop-1); return 0; } /* make sure, the device did not disappear in the meantime */ if (devicepath[0] != '\0' && stat(devicepath, &stats) != 0) { log_debug("device disappeared while waiting for '%s'", file); return -2; } log_debug("wait for '%s' for %i mseconds", file, 1000 / WAIT_LOOP_PER_SECOND); nanosleep(&duration, NULL); } log_debug("waiting for '%s' failed", file); return -1; } static int attr_subst_subdir(char *attr, size_t len) { bool found = false; if (strstr(attr, "/*/")) { char *pos; char dirname[UTIL_PATH_SIZE]; const char *tail; DIR *dir; strscpy(dirname, sizeof(dirname), attr); pos = strstr(dirname, "/*/"); if (pos == NULL) return -1; pos[0] = '\0'; tail = &pos[2]; dir = opendir(dirname); if (dir != NULL) { struct dirent *dent; for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) { struct stat stats; if (dent->d_name[0] == '.') continue; strscpyl(attr, len, dirname, "/", dent->d_name, tail, NULL); if (stat(attr, &stats) == 0) { found = true; break; } } closedir(dir); } } return found; } 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] == ':')) 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] == '=') { *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 int 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; 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_ATTRS: case TK_A_ATTR: 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: log_error("wrong type %u", type); return -1; } 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++; if (rule_tmp->token_cur >= ELEMENTSOF(rule_tmp->token)) { log_error("temporary rule array too small"); return -1; } return 0; } 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; } static int 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; memzero(&rule_tmp, sizeof(struct rule_tmp)); rule_tmp.rules = rules; rule_tmp.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 (*linepos != '\n') { char buf[2] = {linepos[1]}; _cleanup_free_ char *tmp; tmp = cescape(buf); log_error("invalid key/value pair in file %s on line %u," "starting at character %tu ('%s')\n", filename, lineno, linepos - line + 1, tmp); if (linepos[1] == '#') log_error("hint: comments can only start at beginning of line"); } break; } if (streq(key, "ACTION")) { if (op > OP_MATCH_MAX) { log_error("invalid ACTION operation"); goto invalid; } rule_add_key(&rule_tmp, TK_M_ACTION, op, value, NULL); continue; } if (streq(key, "DEVPATH")) { if (op > OP_MATCH_MAX) { log_error("invalid DEVPATH operation"); goto invalid; } rule_add_key(&rule_tmp, TK_M_DEVPATH, op, value, NULL); continue; } if (streq(key, "KERNEL")) { if (op > OP_MATCH_MAX) { log_error("invalid KERNEL operation"); goto invalid; } rule_add_key(&rule_tmp, TK_M_KERNEL, op, value, NULL); continue; } if (streq(key, "SUBSYSTEM")) { if (op > OP_MATCH_MAX) { log_error("invalid SUBSYSTEM operation"); goto invalid; } /* bus, class, subsystem events should all be the same */ if (streq(value, "subsystem") || streq(value, "bus") || streq(value, "class")) { if (streq(value, "bus") || streq(value, "class")) log_error("'%s' must be specified as 'subsystem' " "please fix it in %s:%u", value, filename, lineno); 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); continue; } if (streq(key, "DRIVER")) { if (op > OP_MATCH_MAX) { log_error("invalid DRIVER operation"); goto invalid; } rule_add_key(&rule_tmp, TK_M_DRIVER, op, value, NULL); continue; } if (startswith(key, "ATTR{")) { attr = get_key_attribute(rules->udev, key + strlen("ATTR")); if (attr == NULL) { log_error("error parsing ATTR attribute"); goto invalid; } 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); } continue; } if (startswith(key, "SECLABEL{")) { attr = get_key_attribute(rules->udev, key + strlen("SECLABEL")); if (!attr) { log_error("error parsing SECLABEL attribute"); goto invalid; } rule_add_key(&rule_tmp, TK_A_SECLABEL, op, value, attr); continue; } if (streq(key, "KERNELS")) { if (op > OP_MATCH_MAX) { log_error("invalid KERNELS operation"); goto invalid; } rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL); continue; } if (streq(key, "SUBSYSTEMS")) { if (op > OP_MATCH_MAX) { log_error("invalid SUBSYSTEMS operation"); goto invalid; } rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL); continue; } if (streq(key, "DRIVERS")) { if (op > OP_MATCH_MAX) { log_error("invalid DRIVERS operation"); goto invalid; } rule_add_key(&rule_tmp, TK_M_DRIVERS, op, value, NULL); continue; } if (startswith(key, "ATTRS{")) { if (op > OP_MATCH_MAX) { log_error("invalid ATTRS operation"); goto invalid; } attr = get_key_attribute(rules->udev, key + strlen("ATTRS")); if (attr == NULL) { log_error("error parsing ATTRS attribute"); goto invalid; } if (startswith(attr, "device/")) log_error("the 'device' link may not be available in a future kernel, " "please fix it in %s:%u", filename, lineno); else if (strstr(attr, "../") != NULL) log_error("do not reference parent sysfs directories directly, " "it may break with a future kernel, please fix it in %s:%u", filename, lineno); rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr); continue; } if (streq(key, "TAGS")) { if (op > OP_MATCH_MAX) { log_error("invalid TAGS operation"); goto invalid; } rule_add_key(&rule_tmp, TK_M_TAGS, op, value, NULL); continue; } if (startswith(key, "ENV{")) { attr = get_key_attribute(rules->udev, key + strlen("ENV")); if (attr == NULL) { log_error("error parsing ENV attribute"); goto invalid; } if (op < OP_MATCH_MAX) { if (rule_add_key(&rule_tmp, TK_M_ENV, op, value, attr) != 0) goto invalid; } else { static const char *blacklist[] = { "ACTION", "SUBSYSTEM", "DEVTYPE", "MAJOR", "MINOR", "DRIVER", "IFINDEX", "DEVNAME", "DEVLINKS", "DEVPATH", "TAGS", }; unsigned int i; for (i = 0; i < ELEMENTSOF(blacklist); i++) { if (!streq(attr, blacklist[i])) continue; log_error("invalid ENV attribute, '%s' can not be set %s:%u", attr, filename, lineno); goto invalid; } if (rule_add_key(&rule_tmp, TK_A_ENV, op, value, attr) != 0) goto invalid; } continue; } 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); continue; } if (streq(key, "PROGRAM")) { rule_add_key(&rule_tmp, TK_M_PROGRAM, op, value, NULL); continue; } if (streq(key, "RESULT")) { if (op > OP_MATCH_MAX) { log_error("invalid RESULT operation"); goto invalid; } rule_add_key(&rule_tmp, TK_M_RESULT, op, value, NULL); continue; } if (startswith(key, "IMPORT")) { attr = get_key_attribute(rules->udev, key + strlen("IMPORT")); if (attr == NULL) { log_error("IMPORT{} type missing, ignoring IMPORT %s:%u", filename, lineno); continue; } if (streq(attr, "program")) { /* find known built-in command */ if (value[0] != '/') { enum udev_builtin_cmd cmd; cmd = udev_builtin_lookup(value); if (cmd < UDEV_BUILTIN_MAX) { log_debug("IMPORT found builtin '%s', replacing %s:%u", value, filename, lineno); 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")) { enum udev_builtin_cmd cmd = udev_builtin_lookup(value); if (cmd < UDEV_BUILTIN_MAX) rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, value, &cmd); else log_error("IMPORT{builtin}: '%s' unknown %s:%u", value, filename, lineno); } 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_error("IMPORT{} unknown type, ignoring IMPORT %s:%u", filename, lineno); continue; } if (startswith(key, "TEST")) { mode_t mode = 0; if (op > OP_MATCH_MAX) { log_error("invalid TEST operation"); goto invalid; } 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); } continue; } if (startswith(key, "RUN")) { attr = get_key_attribute(rules->udev, key + strlen("RUN")); if (attr == NULL) attr = "program"; if (streq(attr, "builtin")) { 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_error("IMPORT{builtin}: '%s' unknown %s:%u", value, filename, lineno); } else if (streq(attr, "program")) { enum udev_builtin_cmd cmd = UDEV_BUILTIN_MAX; rule_add_key(&rule_tmp, TK_A_RUN_PROGRAM, op, value, &cmd); } else { log_error("RUN{} unknown type, ignoring RUN %s:%u", filename, lineno); } continue; } if (streq(key, "WAIT_FOR") || streq(key, "WAIT_FOR_SYSFS")) { rule_add_key(&rule_tmp, TK_M_WAITFOR, 0, value, NULL); continue; } if (streq(key, "LABEL")) { rule_tmp.rule.rule.label_off = rules_add_string(rules, value); continue; } if (streq(key, "GOTO")) { rule_add_key(&rule_tmp, TK_A_GOTO, 0, value, NULL); continue; } if (startswith(key, "NAME")) { if (op < OP_MATCH_MAX) { rule_add_key(&rule_tmp, TK_M_NAME, op, value, NULL); } else { if (streq(value, "%k")) { log_error("NAME=\"%%k\" is ignored, because it breaks kernel supplied names, " "please remove it from %s:%u\n", filename, lineno); continue; } if (value[0] == '\0') { log_debug("NAME=\"\" is ignored, because udev will not delete any device nodes, " "please remove it from %s:%u\n", filename, lineno); continue; } rule_add_key(&rule_tmp, TK_A_NAME, op, value, NULL); } rule_tmp.rule.rule.can_set_name = true; continue; } if (streq(key, "SYMLINK")) { 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; continue; } if (streq(key, "OWNER")) { uid_t uid; char *endptr; 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("$%", value[0]) == NULL) { uid = add_uid(rules, value); rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid); } else if (rules->resolve_names >= 0) { rule_add_key(&rule_tmp, TK_A_OWNER, op, value, NULL); } rule_tmp.rule.rule.can_set_name = true; continue; } if (streq(key, "GROUP")) { gid_t gid; char *endptr; gid = strtoul(value, &endptr, 10); if (endptr[0] == '\0') { rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid); } else if ((rules->resolve_names > 0) && strchr("$%", 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; continue; } if (streq(key, "MODE")) { mode_t mode; char *endptr; 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; continue; } if (streq(key, "OPTIONS")) { const char *pos; 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 = &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) { rule_add_key(&rule_tmp, TK_A_STATIC_NODE, op, &pos[strlen("static_node=")], NULL); rule_tmp.rule.rule.has_static_node = true; } continue; } log_error("unknown key '%s' in %s:%u", key, filename, lineno); goto invalid; } /* add rule token */ rule_tmp.rule.rule.token_count = 1 + rule_tmp.token_cur; if (add_token(rules, &rule_tmp.rule) != 0) goto invalid; /* add tokens to list, sorted by type */ if (sort_token(rules, &rule_tmp) != 0) goto invalid; return 0; invalid: log_error("invalid rule '%s:%u'", filename, lineno); return -1; } static int parse_file(struct udev_rules *rules, const char *filename) { FILE *f; 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); } fclose(f); /* 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("failed to enumerate rules files: %s", strerror(-r)); 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 */ free(rules->uids); rules->uids = NULL; rules->uids_cur = 0; rules->uids_max = 0; free(rules->gids); rules->gids = NULL; 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, }; int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event, usec_t timeout_usec, const sigset_t *sigmask) { struct token *cur; struct token *rule; enum escape_type esc = ESCAPE_UNSET; bool can_set_name; if (rules->tokens == NULL) return -1; 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); if (value == NULL) 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)) 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_WAITFOR: { char filename[UTIL_PATH_SIZE]; int found; udev_event_apply_format(event, rules_str(rules, cur->key.value_off), filename, sizeof(filename)); found = (wait_for_file(event->dev, filename, 10) == 0); if (!found && (cur->key.op != OP_NOMATCH)) goto nomatch; break; } case TK_M_ATTR: if (match_attr(rules, event->dev, event, cur) != 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 **envp; char result[UTIL_LINE_SIZE]; free(event->program_result); event->program_result = NULL; udev_event_apply_format(event, rules_str(rules, cur->key.value_off), program, sizeof(program)); envp = udev_device_get_properties_envp(event->dev); 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, program, envp, sigmask, 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, import, sigmask) != 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) { struct udev_list_entry *entry; entry = udev_device_add_property(event->dev, key, value); udev_list_entry_set_num(entry, true); } else { if (cur->key.op != OP_NOMATCH) goto nomatch; } break; } case TK_M_IMPORT_CMDLINE: { FILE *f; 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) { struct udev_list_entry *entry; pos += strlen(key); if (pos[0] == '\0' || isspace(pos[0])) { /* we import simple flags as 'FLAG=1' */ entry = udev_device_add_property(event->dev, key, "1"); udev_list_entry_set_num(entry, true); imported = true; } else if (pos[0] == '=') { const char *value; pos++; value = pos; while (pos[0] != '\0' && !isspace(pos[0])) pos++; pos[0] = '\0'; entry = udev_device_add_property(event->dev, key, value); udev_list_entry_set_num(entry, true); imported = true; } } } fclose(f); } 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]; 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; event->uid = util_lookup_user(event->udev, owner); 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]; 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; event->gid = util_lookup_group(event->udev, group); 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; struct udev_list_entry *entry; 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)); entry = udev_device_add_property(event->dev, name, value_new); /* store in db, skip private keys */ if (name[0] != '.') udev_list_entry_set_num(entry, true); 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; } 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 " "can not be renamed; please fix it in %s:%u\n", name, rules_str(rules, rule->rule.filename_off), rule->rule.filename_line); break; } free(event->name); event->name = strdup(name_str); 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]; FILE *f; 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) { if (fprintf(f, "%s", value) <= 0) log_error("error writing ATTR{%s}: %m", attr); fclose(f); } else { log_error("error opening ATTR{%s} for writing: %m", attr); } 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 0; 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 = 0; 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; strv_free(tags); tags = NULL; 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) { log_error("failed to create %s: %s", tags_dir, strerror(-r)); return r; } 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) { log_error("failed to create symlink %s -> %s: %m", tag_symlink, device_node); return -errno; } else r = 0; } } /* 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) { r = -errno; unlink("/run/udev/static_node-tags"); unlink(path); } fclose(f); } return r; }