/* * Copyright (C) 2008 Kay Sievers * * 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 . */ #include #include #include #include #include #include #include #include #include #include #include "udev.h" #define PREALLOC_TOKEN 2048 #define PREALLOC_STRBUF 32 * 1024 struct uid_gid { unsigned int name_off; union { uid_t uid; gid_t gid; }; }; /* KEY=="", KEY!="", KEY+="", KEY="", KEY:="" */ struct udev_rules { struct udev *udev; 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 to a single string buffer */ char *buf; size_t buf_cur; size_t buf_max; unsigned int buf_count; /* during rule parsing, we cache uid/gid lookup results */ struct uid_gid *uids; unsigned int uids_cur; unsigned int uids_max; struct uid_gid *gids; unsigned int gids_cur; unsigned int gids_max; }; 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 "?*" */ GL_FORMAT, }; /* 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_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_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_PARENT, /* val */ TK_M_RESULT, /* val */ TK_M_MAX, TK_A_IGNORE_DEVICE, TK_A_STRING_ESCAPE_NONE, TK_A_STRING_ESCAPE_REPLACE, TK_A_NUM_FAKE_PART, /* 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_ENV, /* val, attr */ TK_A_NAME, /* val */ TK_A_DEVLINK, /* val */ TK_A_EVENT_TIMEOUT, /* int */ TK_A_IGNORE_REMOVE, TK_A_ATTR, /* val, attr */ TK_A_RUN, /* val, bool */ TK_A_GOTO, /* size_t */ TK_A_LAST_RULE, TK_END, }; /* we try to pack stuff in a way that we take only 16 bytes per token */ struct token { union { unsigned short type; /* same as in rule and key */ struct { unsigned short type; unsigned short flags; unsigned int next_rule; unsigned int label_off; unsigned short filename_off; unsigned short filename_line; } rule; struct { unsigned short type; unsigned short flags; unsigned short op; unsigned short glob; unsigned int value_off; union { unsigned int attr_off; int ignore_error; int i; unsigned int rule_goto; mode_t mode; uid_t uid; gid_t gid; int num_fake_part; int devlink_prio; int event_timeout; }; } 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[] = { [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", }; static const char *string_glob_str[] = { [GL_UNSET] = "UNSET", [GL_PLAIN] = "plain", [GL_GLOB] = "glob", [GL_SPLIT] = "split", [GL_SPLIT_GLOB] = "split-glob", [GL_SOMETHING] = "split-glob", [GL_FORMAT] = "format", }; static const char *token_str[] = { [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_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_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_PARENT] = "M MPORT_PARENT", [TK_M_RESULT] = "M RESULT", [TK_M_MAX] = "M MAX", [TK_A_IGNORE_DEVICE] = "A IGNORE_DEVICE", [TK_A_STRING_ESCAPE_NONE] = "A STRING_ESCAPE_NONE", [TK_A_STRING_ESCAPE_REPLACE] = "A STRING_ESCAPE_REPLACE", [TK_A_NUM_FAKE_PART] = "A NUM_FAKE_PART", [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_MODE_ID] = "A MODE_ID", [TK_A_ENV] = "A ENV", [TK_A_NAME] = "A NAME", [TK_A_DEVLINK] = "A DEVLINK", [TK_A_EVENT_TIMEOUT] = "A EVENT_TIMEOUT", [TK_A_IGNORE_REMOVE] = "A IGNORE_REMOVE", [TK_A_ATTR] = "A ATTR", [TK_A_RUN] = "A RUN", [TK_A_GOTO] = "A GOTO", [TK_A_LAST_RULE] = "A LAST_RULE", [TK_END] = "END", }; 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->buf[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 off = tk_ptr - tks_ptr; dbg(rules->udev, "* RULE %s:%u, off: %u(%u), next: %u, label: '%s', flags: 0x%02x\n", &rules->buf[token->rule.filename_off], token->rule.filename_line, off / (unsigned int) sizeof(struct token), off, token->rule.next_rule, &rules->buf[token->rule.label_off], token->rule.flags); 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_PROGRAM: case TK_M_IMPORT_FILE: case TK_M_IMPORT_PROG: 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: dbg(rules->udev, "%s %s '%s'(%s)\n", token_str[type], operation_str[op], value, string_glob_str[glob]); break; case TK_M_ATTR: case TK_M_ATTRS: case TK_M_ENV: case TK_A_ATTR: case TK_A_ENV: dbg(rules->udev, "%s %s '%s' '%s'(%s)\n", token_str[type], operation_str[op], attr, value, string_glob_str[glob]); break; case TK_A_IGNORE_DEVICE: case TK_A_STRING_ESCAPE_NONE: case TK_A_STRING_ESCAPE_REPLACE: case TK_A_LAST_RULE: case TK_A_IGNORE_REMOVE: dbg(rules->udev, "%s\n", token_str[type]); break; case TK_M_TEST: dbg(rules->udev, "%s %s '%s'(%s) %#o\n", token_str[type], operation_str[op], value, string_glob_str[glob], token->key.mode); break; case TK_A_NUM_FAKE_PART: dbg(rules->udev, "%s %u\n", token_str[type], token->key.num_fake_part); break; case TK_A_DEVLINK_PRIO: dbg(rules->udev, "%s %s %u\n", token_str[type], operation_str[op], token->key.devlink_prio); break; case TK_A_OWNER_ID: dbg(rules->udev, "%s %s %u\n", token_str[type], operation_str[op], token->key.uid); break; case TK_A_GROUP_ID: dbg(rules->udev, "%s %s %u\n", token_str[type], operation_str[op], token->key.gid); break; case TK_A_MODE_ID: dbg(rules->udev, "%s %s %#o\n", token_str[type], operation_str[op], token->key.mode); break; case TK_A_EVENT_TIMEOUT: dbg(rules->udev, "%s %s %u\n", token_str[type], operation_str[op], token->key.event_timeout); break; case TK_A_GOTO: dbg(rules->udev, "%s '%s' %u\n", token_str[type], value, token->key.rule_goto); break; case TK_END: dbg(rules->udev, "* %s\n", token_str[type]); break; case TK_M_PARENTS_MIN: case TK_M_PARENTS_MAX: case TK_M_MAX: case TK_UNSET: dbg(rules->udev, "unknown type %u\n", type); break; } } static void dump_rules(struct udev_rules *rules) { unsigned int i; dbg(rules->udev, "dumping %u (%zu bytes) tokens, %u (%zu bytes) strings\n", 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 const char **operation_str; static const char **token_str; static inline void dump_token(struct udev_rules *rules, struct token *token) {} static inline void dump_rules(struct udev_rules *rules) {} #endif /* DEBUG */ /* we could lookup and return existing strings, or tails of strings */ static int add_string(struct udev_rules *rules, const char *str) { size_t len = strlen(str)+1; int off; /* offset 0 is always '\0' */ if (str[0] == '\0') return 0; /* grow buffer if needed */ if (rules->buf_cur + len+1 >= rules->buf_max) { char *buf; unsigned int add; /* double the buffer size */ add = rules->buf_max; if (add < len * 8) add = len * 8; buf = realloc(rules->buf, rules->buf_max + add); if (buf == NULL) return -1; dbg(rules->udev, "extend buffer from %zu to %zu\n", rules->buf_max, rules->buf_max + add); rules->buf = buf; rules->buf_max += add; } off = rules->buf_cur; memcpy(&rules->buf[rules->buf_cur], str, len); rules->buf_cur += len; rules->buf_count++; return off; } 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; dbg(rules->udev, "extend tokens from %u to %u\n", rules->token_max, rules->token_max + add); 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 (strcmp(&rules->buf[off], owner) == 0) { uid = rules->uids[i].uid; dbg(rules->udev, "return existing %u for '%s'\n", uid, owner); 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; dbg(rules->udev, "extend uids from %u to %u\n", rules->uids_max, rules->uids_max + add); rules->uids = uids; rules->uids_max += add; } rules->uids[rules->uids_cur].uid = uid; off = 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 (strcmp(&rules->buf[off], group) == 0) { gid = rules->gids[i].gid; dbg(rules->udev, "return existing %u for '%s'\n", gid, group); 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; dbg(rules->udev, "extend gids from %u to %u\n", rules->gids_max, rules->gids_max + add); rules->gids = gids; rules->gids_max += add; } rules->gids[rules->gids_cur].gid = gid; off = 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) { struct udev *udev = udev_device_get_udev(dev); 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]) { info(udev, "inconsistent quoting: '%s', skip\n", line); return -1; } val[len-1] = '\0'; val++; } dbg(udev, "adding '%s'='%s'\n", key, val); /* handle device, renamed by external tool, returning new path */ if (strcmp(key, "DEVPATH") == 0) { char syspath[UTIL_PATH_SIZE]; info(udev, "updating devpath from '%s' to '%s'\n", udev_device_get_devpath(dev), val); util_strlcpy(syspath, udev_get_sys_path(udev), sizeof(syspath)); util_strlcat(syspath, val, sizeof(syspath)); udev_device_set_syspath(dev, syspath); } else { struct udev_list_entry *entry; entry = udev_device_add_property(dev, key, val); /* store in db */ udev_list_entry_set_flag(entry, 1); } 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, "r"); 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_device *dev, const char *program) { struct udev *udev = udev_device_get_udev(dev); char **envp; char result[2048]; size_t reslen; char *line; envp = udev_device_get_properties_envp(dev); if (util_run_program(udev, program, envp, result, sizeof(result), &reslen) != 0) return -1; 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 *udev = udev_device_get_udev(dev); struct udev_device *dev_parent; struct udev_list_entry *list_entry; dev_parent = udev_device_get_parent(dev); if (dev_parent == NULL) return -1; dbg(udev, "found parent '%s', get the node name\n", udev_device_get_syspath(dev_parent)); 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; dbg(udev, "import key '%s=%s'\n", key, val); entry = udev_device_add_property(dev, key, val); /* store in db */ udev_list_entry_set_flag(entry, 1); } } return 0; } #define WAIT_LOOP_PER_SECOND 50 static int wait_for_file(struct udev_device *dev, const char *file, int timeout) { struct udev *udev = udev_device_get_udev(dev); 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] != '/') { util_strlcpy(devicepath, udev_get_sys_path(udev), sizeof(devicepath)); util_strlcat(devicepath, udev_device_get_devpath(dev), sizeof(devicepath)); util_strlcpy(filepath, devicepath, sizeof(filepath)); util_strlcat(filepath, "/", sizeof(filepath)); util_strlcat(filepath, file, sizeof(filepath)); file = filepath; } dbg(udev, "will wait %i sec for '%s'\n", timeout, file); while (--loop) { /* lookup file */ if (stat(file, &stats) == 0) { info(udev, "file '%s' appeared after %i loops\n", 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) { info(udev, "device disappeared while waiting for '%s'\n", file); return -2; } info(udev, "wait for '%s' for %i mseconds\n", file, 1000 / WAIT_LOOP_PER_SECOND); usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND); } info(udev, "waiting for '%s' failed\n", file); return -1; } static int attr_subst_subdir(char *attr, size_t len) { char *pos; int found = 0; pos = strstr(attr, "/*/"); if (pos != NULL) { char str[UTIL_PATH_SIZE]; DIR *dir; pos[1] = '\0'; util_strlcpy(str, &pos[2], sizeof(str)); dir = opendir(attr); if (dir != NULL) { struct dirent *dent; for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) { struct stat stats; if (dent->d_name[0] == '.') continue; util_strlcat(attr, dent->d_name, len); util_strlcat(attr, str, len); if (stat(attr, &stats) == 0) { found = 1; break; } pos[1] = '\0'; } closedir(dir); } if (!found) util_strlcat(attr, str, len); } 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; while (1) { 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++; dbg(udev, "%s '%s'-'%s'\n", operation_str[*op], *key, *value); /* move line to next key */ *line = temp; return 0; } /* extract possible KEY{attr} */ static 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) { err(udev, "missing closing brace for format\n"); return NULL; } pos[0] = '\0'; dbg(udev, "attribute='%s'\n", attr); 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 = data; enum string_glob_type glob; memset(token, 0x00, 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_PROGRAM: case TK_M_IMPORT_FILE: case TK_M_IMPORT_PROG: case TK_M_IMPORT_PARENT: case TK_M_RESULT: case TK_A_OWNER: case TK_A_GROUP: case TK_A_MODE: case TK_A_NAME: case TK_A_DEVLINK: case TK_A_GOTO: token->key.value_off = add_string(rule_tmp->rules, value); break; case TK_M_ENV: case TK_M_ATTR: case TK_M_ATTRS: case TK_A_ATTR: case TK_A_ENV: token->key.value_off = add_string(rule_tmp->rules, value); token->key.attr_off = add_string(rule_tmp->rules, attr); break; case TK_M_TEST: token->key.value_off = add_string(rule_tmp->rules, value); if (data != NULL) token->key.mode = *(mode_t *)data; break; case TK_A_IGNORE_DEVICE: case TK_A_STRING_ESCAPE_NONE: case TK_A_STRING_ESCAPE_REPLACE: case TK_A_IGNORE_REMOVE: case TK_A_LAST_RULE: break; case TK_A_RUN: token->key.value_off = add_string(rule_tmp->rules, value); token->key.ignore_error = *(int *)data; break; case TK_A_NUM_FAKE_PART: token->key.num_fake_part = *(int *)data; break; 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_A_EVENT_TIMEOUT: token->key.event_timeout = *(int *)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: err(rule_tmp->rules->udev, "wrong type %u\n", type); return -1; } glob = GL_PLAIN; if (value != NULL) { if (type < TK_M_MAX) { /* check if we need to split or call fnmatch() while matching rules */ int has_split; int has_glob; has_split = (strchr(value, '|') != NULL); has_glob = (strchr(value, '*') != NULL || strchr(value, '?') != NULL || strchr(value, '[') != NULL || strchr(value, ']') != NULL); if (has_split && has_glob) { glob = GL_SPLIT_GLOB; } else if (has_split) { glob = GL_SPLIT; } else if (has_glob) { if (strcmp(value, "?*") == 0) glob = GL_SOMETHING; else glob = GL_GLOB; } } else { /* check if we need to substitute format strings for matching rules */ if (strchr(value, '%') != NULL || strchr(value, '$') != NULL) glob = GL_FORMAT; } } token->key.type = type; token->key.op = op; token->key.glob = glob; rule_tmp->token_cur++; if (rule_tmp->token_cur >= ARRAY_SIZE(rule_tmp->token)) { err(rule_tmp->rules->udev, "temporary rule array too small\n"); 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; 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) { int valid = 0; char *linepos; char *attr; int physdev = 0; struct rule_tmp rule_tmp; memset(&rule_tmp, 0x00, sizeof(struct rule_tmp)); rule_tmp.rules = rules; rule_tmp.rule.type = TK_RULE; rule_tmp.rule.rule.filename_off = filename_off; rule_tmp.rule.rule.filename_line = lineno; linepos = line; while (1) { char *key; char *value; enum operation_type op; if (get_key(rules->udev, &linepos, &key, &op, &value) != 0) break; if (strcasecmp(key, "ACTION") == 0) { if (op > OP_MATCH_MAX) { err(rules->udev, "invalid ACTION operation\n"); goto invalid; } rule_add_key(&rule_tmp, TK_M_ACTION, op, value, NULL); valid = 1; continue; } if (strcasecmp(key, "DEVPATH") == 0) { if (op > OP_MATCH_MAX) { err(rules->udev, "invalid DEVPATH operation\n"); goto invalid; } rule_add_key(&rule_tmp, TK_M_DEVPATH, op, value, NULL); valid = 1; continue; } if (strcasecmp(key, "KERNEL") == 0) { if (op > OP_MATCH_MAX) { err(rules->udev, "invalid KERNEL operation\n"); goto invalid; } rule_add_key(&rule_tmp, TK_M_KERNEL, op, value, NULL); valid = 1; continue; } if (strcasecmp(key, "SUBSYSTEM") == 0) { if (op > OP_MATCH_MAX) { err(rules->udev, "invalid SUBSYSTEM operation\n"); goto invalid; } /* bus, class, subsystem events should all be the same */ if (strcmp(value, "subsystem") == 0 || strcmp(value, "bus") == 0 || strcmp(value, "class") == 0) { if (strcmp(value, "bus") == 0 || strcmp(value, "class") == 0) err(rules->udev, "'%s' must be specified as 'subsystem' \n" "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); valid = 1; continue; } if (strcasecmp(key, "DRIVER") == 0) { if (op > OP_MATCH_MAX) { err(rules->udev, "invalid DRIVER operation\n"); goto invalid; } rule_add_key(&rule_tmp, TK_M_DRIVER, op, value, NULL); valid = 1; continue; } if (strncasecmp(key, "ATTR{", sizeof("ATTR{")-1) == 0) { attr = get_key_attribute(rules->udev, key + sizeof("ATTR")-1); if (attr == NULL) { err(rules->udev, "error parsing ATTR attribute\n"); 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); } valid = 1; continue; } if (strcasecmp(key, "KERNELS") == 0 || strcasecmp(key, "ID") == 0) { if (op > OP_MATCH_MAX) { err(rules->udev, "invalid KERNELS operation\n"); goto invalid; } rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL); valid = 1; continue; } if (strcasecmp(key, "SUBSYSTEMS") == 0 || strcasecmp(key, "BUS") == 0) { if (op > OP_MATCH_MAX) { err(rules->udev, "invalid SUBSYSTEMS operation\n"); goto invalid; } rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL); valid = 1; continue; } if (strcasecmp(key, "DRIVERS") == 0) { if (op > OP_MATCH_MAX) { err(rules->udev, "invalid DRIVERS operation\n"); goto invalid; } rule_add_key(&rule_tmp, TK_M_DRIVERS, op, value, NULL); valid = 1; continue; } if (strncasecmp(key, "ATTRS{", sizeof("ATTRS{")-1) == 0 || strncasecmp(key, "SYSFS{", sizeof("SYSFS{")-1) == 0) { if (op > OP_MATCH_MAX) { err(rules->udev, "invalid ATTRS operation\n"); goto invalid; } attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1); if (attr == NULL) { err(rules->udev, "error parsing ATTRS attribute\n"); goto invalid; } if (strncmp(attr, "device/", 7) == 0) err(rules->udev, "the 'device' link may not be available in a future kernel, " "please fix it in %s:%u", filename, lineno); else if (strstr(attr, "../") != NULL) err(rules->udev, "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); valid = 1; continue; } if (strncasecmp(key, "ENV{", sizeof("ENV{")-1) == 0) { attr = get_key_attribute(rules->udev, key + sizeof("ENV")-1); if (attr == NULL) { err(rules->udev, "error parsing ENV attribute\n"); goto invalid; } if (strncmp(attr, "PHYSDEV", 7) == 0) physdev = 1; if (op < OP_MATCH_MAX) { if (rule_add_key(&rule_tmp, TK_M_ENV, op, value, attr) != 0) goto invalid; } else { if (rule_add_key(&rule_tmp, TK_A_ENV, op, value, attr) != 0) goto invalid; } valid = 1; continue; } if (strcasecmp(key, "PROGRAM") == 0) { rule_add_key(&rule_tmp, TK_M_PROGRAM, op, value, NULL); valid = 1; continue; } if (strcasecmp(key, "RESULT") == 0) { if (op > OP_MATCH_MAX) { err(rules->udev, "invalid RESULT operation\n"); goto invalid; } rule_add_key(&rule_tmp, TK_M_RESULT, op, value, NULL); valid = 1; continue; } if (strncasecmp(key, "IMPORT", sizeof("IMPORT")-1) == 0) { attr = get_key_attribute(rules->udev, key + sizeof("IMPORT")-1); if (attr != NULL && strstr(attr, "program")) { dbg(rules->udev, "IMPORT will be executed\n"); rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL); valid = 1; } else if (attr != NULL && strstr(attr, "file")) { dbg(rules->udev, "IMPORT will be included as file\n"); rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL); valid = 1; } else if (attr != NULL && strstr(attr, "parent")) { dbg(rules->udev, "IMPORT will include the parent values\n"); rule_add_key(&rule_tmp, TK_M_IMPORT_PARENT, op, value, NULL); valid = 1; } else { /* figure it out if it is executable */ char file[UTIL_PATH_SIZE]; char *pos; struct stat statbuf; util_strlcpy(file, value, sizeof(file)); pos = strchr(file, ' '); if (pos) pos[0] = '\0'; /* allow programs in /lib/udev called without the path */ if (strchr(file, '/') == NULL) { util_strlcpy(file, UDEV_PREFIX "/lib/udev/", sizeof(file)); util_strlcat(file, value, sizeof(file)); pos = strchr(file, ' '); if (pos) pos[0] = '\0'; } dbg(rules->udev, "IMPORT auto mode for '%s'\n", file); if (!lstat(file, &statbuf) && (statbuf.st_mode & S_IXUSR)) { dbg(rules->udev, "IMPORT will be executed (autotype)\n"); rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL); valid = 1; } else { dbg(rules->udev, "IMPORT will be included as file (autotype)\n"); rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL); valid = 1; } } continue; } if (strncasecmp(key, "TEST", sizeof("TEST")-1) == 0) { mode_t mode = 0; if (op > OP_MATCH_MAX) { err(rules->udev, "invalid TEST operation\n"); goto invalid; } attr = get_key_attribute(rules->udev, key + sizeof("TEST")-1); 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); } valid = 1; continue; } if (strncasecmp(key, "RUN", sizeof("RUN")-1) == 0) { int flag = 0; attr = get_key_attribute(rules->udev, key + sizeof("RUN")-1); if (attr != NULL && strstr(attr, "ignore_error")) flag = 1; rule_add_key(&rule_tmp, TK_A_RUN, op, value, &flag); valid = 1; continue; } if (strcasecmp(key, "WAIT_FOR") == 0 || strcasecmp(key, "WAIT_FOR_SYSFS") == 0) { rule_add_key(&rule_tmp, TK_M_WAITFOR, 0, value, NULL); valid = 1; continue; } if (strcasecmp(key, "LABEL") == 0) { rule_tmp.rule.rule.label_off = add_string(rules, value); valid = 1; continue; } if (strcasecmp(key, "GOTO") == 0) { rule_add_key(&rule_tmp, TK_A_GOTO, 0, value, NULL); valid = 1; continue; } if (strncasecmp(key, "NAME", sizeof("NAME")-1) == 0) { if (op < OP_MATCH_MAX) { rule_add_key(&rule_tmp, TK_M_NAME, op, value, NULL); } else { if (value[0] == '\0') dbg(rules->udev, "name empty, node creation suppressed\n"); rule_add_key(&rule_tmp, TK_A_NAME, op, value, NULL); attr = get_key_attribute(rules->udev, key + sizeof("NAME")-1); if (attr != NULL) { if (strstr(attr, "all_partitions") != NULL) { int num = DEFAULT_FAKE_PARTITIONS_COUNT; dbg(rules->udev, "creation of partition nodes requested\n"); rule_add_key(&rule_tmp, TK_A_NUM_FAKE_PART, 0, NULL, &num); } if (strstr(attr, "ignore_remove") != NULL) { dbg(rules->udev, "remove event should be ignored\n"); rule_add_key(&rule_tmp, TK_A_IGNORE_REMOVE, 0, NULL, NULL); } } } rule_tmp.rule.rule.flags = 1; continue; } if (strcasecmp(key, "SYMLINK") == 0) { 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.flags = 1; valid = 1; continue; } if (strcasecmp(key, "OWNER") == 0) { 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 && strchr("$%", value[0]) == NULL) { uid = add_uid(rules, value); rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid); } else { rule_add_key(&rule_tmp, TK_A_OWNER, op, value, NULL); } rule_tmp.rule.rule.flags = 1; valid = 1; continue; } if (strcasecmp(key, "GROUP") == 0) { 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 && strchr("$%", value[0]) == NULL) { gid = add_gid(rules, value); rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid); } else { rule_add_key(&rule_tmp, TK_A_GROUP, op, value, NULL); } rule_tmp.rule.rule.flags = 1; valid = 1; continue; } if (strcasecmp(key, "MODE") == 0) { 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.flags = 1; valid = 1; continue; } if (strcasecmp(key, "OPTIONS") == 0) { const char *pos; if (strstr(value, "last_rule") != NULL) { dbg(rules->udev, "last rule to be applied\n"); rule_add_key(&rule_tmp, TK_A_LAST_RULE, 0, NULL, NULL); } if (strstr(value, "ignore_device") != NULL) { dbg(rules->udev, "device should be ignored\n"); rule_add_key(&rule_tmp, TK_A_IGNORE_DEVICE, 0, NULL, NULL); } if (strstr(value, "ignore_remove") != NULL) { dbg(rules->udev, "remove event should be ignored\n"); rule_add_key(&rule_tmp, TK_A_IGNORE_REMOVE, 0, NULL, NULL); } pos = strstr(value, "link_priority="); if (pos != NULL) { int prio = atoi(&pos[strlen("link_priority=")]); rule_add_key(&rule_tmp, TK_A_DEVLINK_PRIO, 0, NULL, &prio); dbg(rules->udev, "link priority=%i\n", prio); } pos = strstr(value, "event_timeout="); if (pos != NULL) { int tout = atoi(&pos[strlen("event_timeout=")]); rule_add_key(&rule_tmp, TK_A_EVENT_TIMEOUT, 0, NULL, &tout); dbg(rules->udev, "event timout=%i\n", tout); } pos = strstr(value, "string_escape="); if (pos != NULL) { pos = &pos[strlen("string_escape=")]; if (strncmp(pos, "none", strlen("none")) == 0) rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_NONE, 0, NULL, NULL); else if (strncmp(pos, "replace", strlen("replace")) == 0) rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_REPLACE, 0, NULL, NULL); } if (strstr(value, "all_partitions") != NULL) { int num = DEFAULT_FAKE_PARTITIONS_COUNT; rule_add_key(&rule_tmp, TK_A_NUM_FAKE_PART, 0, NULL, &num); dbg(rules->udev, "creation of partition nodes requested\n"); } valid = 1; continue; } err(rules->udev, "unknown key '%s' in %s:%u\n", key, filename, lineno); } if (physdev) err(rules->udev, "PHYSDEV* values are deprecated and not available on recent kernels, \n" "please fix it in %s:%u", filename, lineno); /* skip line if not any valid key was found */ if (!valid) goto invalid; /* add rule token */ 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: err(rules->udev, "invalid rule '%s:%u'\n", filename, lineno); return -1; } static int parse_file(struct udev_rules *rules, const char *filename, unsigned short filename_off) { FILE *f; unsigned int first_token; char line[UTIL_LINE_SIZE]; int line_nr = 0; unsigned int i; info(rules->udev, "reading '%s' as rules file\n", filename); f = fopen(filename, "r"); if (f == NULL) return -1; first_token = rules->token_cur; 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; line_nr++; len = strlen(line); } if (len+1 >= sizeof(line)) { err(rules->udev, "line too long '%s':%u, ignored\n", 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->buf[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 (strcmp(label, &rules->buf[rules->tokens[j].rule.label_off]) != 0) continue; rules->tokens[i].key.rule_goto = j; } if (rules->tokens[i].key.rule_goto == 0) err(rules->udev, "GOTO '%s' has no matching label in: '%s'\n", label, filename); } } return 0; } static int add_matching_files(struct udev *udev, struct udev_list_node *file_list, const char *dirname, const char *suffix) { struct dirent *ent; DIR *dir; char filename[UTIL_PATH_SIZE]; dbg(udev, "open directory '%s'\n", dirname); dir = opendir(dirname); if (dir == NULL) { err(udev, "unable to open '%s': %m\n", dirname); return -1; } while (1) { ent = readdir(dir); if (ent == NULL || ent->d_name[0] == '\0') break; if ((ent->d_name[0] == '.') || (ent->d_name[0] == '#')) continue; /* look for file matching with specified suffix */ if (suffix != NULL) { const char *ext; ext = strrchr(ent->d_name, '.'); if (ext == NULL) continue; if (strcmp(ext, suffix) != 0) continue; } dbg(udev, "put file '%s/%s' into list\n", dirname, ent->d_name); snprintf(filename, sizeof(filename), "%s/%s", dirname, ent->d_name); filename[sizeof(filename)-1] = '\0'; udev_list_entry_add(udev, file_list, filename, NULL, 1, 1); } closedir(dir); return 0; } struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names) { struct udev_rules *rules; struct stat statbuf; struct udev_list_node file_list; struct udev_list_entry *file_loop, *file_tmp; unsigned int prev_rule; struct token end_token; unsigned int i; rules = malloc(sizeof(struct udev_rules)); if (rules == NULL) return NULL; memset(rules, 0x00, sizeof(struct udev_rules)); rules->udev = udev; rules->resolve_names = resolve_names; udev_list_init(&file_list); /* init token array and string buffer */ rules->tokens = malloc(PREALLOC_TOKEN * sizeof(struct token)); if (rules->tokens == NULL) return NULL; rules->token_max = PREALLOC_TOKEN; rules->buf = malloc(PREALLOC_STRBUF); if (rules->buf == NULL) return NULL; rules->buf_max = PREALLOC_STRBUF; /* offset 0 is always '\0' */ rules->buf[0] = '\0'; rules->buf_cur = 1; dbg(udev, "prealloc %zu bytes tokens (%u * %zu bytes), %zu bytes buffer\n", rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max); if (udev_get_rules_path(udev) != NULL) { /* custom rules location for testing */ add_matching_files(udev, &file_list, udev_get_rules_path(udev), ".rules"); } else { char filename[PATH_MAX]; struct udev_list_node sort_list; struct udev_list_entry *sort_loop, *sort_tmp; /* read user/custom rules */ add_matching_files(udev, &file_list, SYSCONFDIR "/udev/rules.d", ".rules"); /* read dynamic/temporary rules */ util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename)); util_strlcat(filename, "/.udev/rules.d", sizeof(filename)); if (stat(filename, &statbuf) != 0) { util_create_path(udev, filename); udev_selinux_setfscreatecon(udev, filename, S_IFDIR|0755); mkdir(filename, 0755); udev_selinux_resetfscreatecon(udev); } udev_list_init(&sort_list); add_matching_files(udev, &sort_list, filename, ".rules"); /* read default rules */ add_matching_files(udev, &sort_list, UDEV_PREFIX "/lib/udev/rules.d", ".rules"); /* sort all rules files by basename into list of files */ udev_list_entry_foreach_safe(sort_loop, sort_tmp, udev_list_get_entry(&sort_list)) { const char *sort_name = udev_list_entry_get_name(sort_loop); const char *sort_base = strrchr(sort_name, '/'); if (sort_base == NULL) continue; /* sort entry into existing list */ udev_list_entry_foreach_safe(file_loop, file_tmp, udev_list_get_entry(&file_list)) { const char *file_name = udev_list_entry_get_name(file_loop); const char *file_base = strrchr(file_name, '/'); if (file_base == NULL) continue; if (strcmp(file_base, sort_base) == 0) { info(udev, "rule file basename '%s' already added, ignoring '%s'\n", file_name, sort_name); udev_list_entry_delete(sort_loop); sort_loop = NULL; break; } if (strcmp(file_base, sort_base) > 0) { /* found later file, insert before */ udev_list_entry_remove(sort_loop); udev_list_entry_insert_before(sort_loop, file_loop); sort_loop = NULL; break; } } /* current file already handled */ if (sort_loop == NULL) continue; /* no later file, append to end of list */ udev_list_entry_remove(sort_loop); udev_list_entry_append(sort_loop, &file_list); } } /* add all filenames to the string buffer */ udev_list_entry_foreach(file_loop, udev_list_get_entry(&file_list)) { const char *filename = udev_list_entry_get_name(file_loop); unsigned int filename_off; filename_off = add_string(rules, filename); /* the offset in the rule is limited to unsigned short */ if (filename_off < USHRT_MAX) udev_list_entry_set_flag(file_loop, filename_off); } /* parse list of files */ udev_list_entry_foreach_safe(file_loop, file_tmp, udev_list_get_entry(&file_list)) { const char *filename = udev_list_entry_get_name(file_loop); unsigned int filename_off = udev_list_entry_get_flag(file_loop); if (stat(filename, &statbuf) == 0 && statbuf.st_size > 0) parse_file(rules, filename, filename_off); else info(udev, "can not read '%s'\n", filename); udev_list_entry_delete(file_loop); } memset(&end_token, 0x00, sizeof(struct token)); end_token.type = TK_END; add_token(rules, &end_token); /* link all TK_RULE tokens to be able to fast-forward to next TK_RULE */ prev_rule = 0; for (i = 1; i < rules->token_cur; i++) { if (rules->tokens[i].type == TK_RULE) { rules->tokens[prev_rule].rule.next_rule = i; prev_rule = i; } } /* shrink allocated token and string buffer */ if (rules->token_cur < rules->token_max) { struct token *tokens; tokens = realloc(rules->tokens, rules->token_cur * sizeof(struct token)); if (tokens != NULL || rules->token_cur == 0) { rules->tokens = tokens; rules->token_max = rules->token_cur; } } if (rules->buf_cur < rules->buf_max) { char *buf; buf = realloc(rules->buf, rules->buf_cur); if (buf != NULL || rules->buf_cur == 0) { rules->buf = buf; rules->buf_max = rules->buf_cur; } } info(udev, "shrunk to %lu bytes tokens (%u * %zu bytes), %zu bytes buffer\n", rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max); /* 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; } void udev_rules_unref(struct udev_rules *rules) { if (rules == NULL) return; free(rules->tokens); free(rules->buf); free(rules->uids); free(rules->gids); free(rules); } static int match_key(struct udev_rules *rules, struct token *token, const char *val) { char *key_value = &rules->buf[token->key.value_off]; char *pos; int match = 0; if (val == NULL) val = ""; switch (token->key.glob) { case GL_PLAIN: match = (strcmp(key_value, val) == 0); break; case GL_GLOB: match = (fnmatch(key_value, val, 0) == 0); break; case GL_SPLIT: { const char *split; size_t len; split = &rules->buf[token->key.value_off]; len = strlen(val); while (1) { const char *next; next = strchr(split, '|'); if (next != NULL) { size_t matchlen = (size_t)(next - split); match = (matchlen == len && strncmp(split, val, matchlen) == 0); if (match) break; } else { match = (strcmp(split, val) == 0); break; } split = &next[1]; } break; } case GL_SPLIT_GLOB: { char value[UTIL_PATH_SIZE]; util_strlcpy(value, &rules->buf[token->key.value_off], sizeof(value)); key_value = value; while (key_value != NULL) { pos = strchr(key_value, '|'); if (pos != NULL) { pos[0] = '\0'; pos = &pos[1]; } dbg(rules->udev, "match %s '%s' <-> '%s'\n", token_str[token->type], key_value, val); match = (fnmatch(key_value, val, 0) == 0); if (match) break; key_value = pos; } break; } case GL_SOMETHING: match = (val[0] != '\0'); break; case GL_FORMAT: case GL_UNSET: return -1; } if (match && (token->key.op == OP_MATCH)) { dbg(rules->udev, "%s is true (matching value)\n", token_str[token->type]); return 0; } if (!match && (token->key.op == OP_NOMATCH)) { dbg(rules->udev, "%s is true (non-matching value)\n", token_str[token->type]); return 0; } dbg(rules->udev, "%s is not true\n", token_str[token->type]); return -1; } static int match_attr(struct udev_rules *rules, struct udev_device *dev, struct udev_event *event, struct token *cur) { const char *key_name = &rules->buf[cur->key.attr_off]; const char *key_value = &rules->buf[cur->key.value_off]; char value[UTIL_NAME_SIZE]; size_t len; value[0] = '\0'; if (key_name[0] == '[') { char attr[UTIL_PATH_SIZE]; util_strlcpy(attr, key_name, sizeof(attr)); util_resolve_subsys_kernel(event->udev, attr, value, sizeof(value), 1); } if (value[0] == '\0') { const char *val; val = udev_device_get_sysattr_value(dev, key_name); if (val == NULL) return -1; util_strlcpy(value, val, sizeof(value)); } /* strip trailing whitespace of value, if not asked to match for it */ len = strlen(key_value); if (len > 0 && !isspace(key_value[len-1])) { len = strlen(value); while (len > 0 && isspace(value[--len])) value[len] = '\0'; dbg(rules->udev, "removed trailing whitespace from '%s'\n", value); } 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) { struct token *cur; struct token *rule; enum escape_type esc = ESCAPE_UNSET; int can_set_name; if (rules->tokens == NULL) return -1; can_set_name = ((strcmp(udev_device_get_action(event->dev), "add") == 0 || strcmp(udev_device_get_action(event->dev), "change") == 0) && (major(udev_device_get_devnum(event->dev)) > 0 || strcmp(udev_device_get_subsystem(event->dev), "net") == 0)); /* loop through token list, match, run actions or forward to next rule */ cur = &rules->tokens[0]; rule = cur; while (1) { unsigned int idx; 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.flags) ;//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: { size_t devlen = strlen(udev_get_dev_path(event->udev))+1; struct udev_list_entry *list_entry; int match = 0; 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)[devlen]; if (match_key(rules, cur, devlink) == 0) { match = 1; 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: { struct udev_list_entry *list_entry; const char *key_name = &rules->buf[cur->key.attr_off]; const char *value; list_entry = udev_device_get_properties_list_entry(event->dev); list_entry = udev_list_entry_get_by_name(list_entry, key_name); value = udev_list_entry_get_value(list_entry); if (value == NULL) { dbg(event->udev, "ENV{%s} is not set, treat as empty\n", key_name); value = ""; } if (match_key(rules, cur, value)) 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; util_strlcpy(filename, &rules->buf[cur->key.value_off], sizeof(filename)); udev_event_apply_format(event, 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: { 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; while (1) { struct token *key; dbg(event->udev, "parent: '%s'\n", udev_device_get_syspath(event->dev_parent)); /* 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; default: goto nomatch; } dbg(event->udev, "parent key matched\n"); } dbg(event->udev, "all parent keys matched\n"); /* all keys matched */ 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; util_strlcpy(filename, &rules->buf[cur->key.value_off], sizeof(filename)); udev_event_apply_format(event, filename, sizeof(filename)); if (util_resolve_subsys_kernel(event->udev, NULL, filename, sizeof(filename), 0) != 0) if (filename[0] != '/') { char tmp[UTIL_PATH_SIZE]; util_strlcpy(tmp, udev_device_get_syspath(event->dev), sizeof(tmp)); util_strlcat(tmp, "/", sizeof(tmp)); util_strlcat(tmp, filename, sizeof(tmp)); util_strlcpy(filename, tmp, sizeof(filename)); } attr_subst_subdir(filename, sizeof(filename)); match = (stat(filename, &statbuf) == 0); dbg(event->udev, "'%s' %s", filename, match ? "exists\n" : "does not exist\n"); if (match && cur->key.mode > 0) { match = ((statbuf.st_mode & cur->key.mode) > 0); dbg(event->udev, "'%s' has mode=%#o and %s %#o\n", filename, statbuf.st_mode, match ? "matches" : "does not match", cur->key.mode); } 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_PATH_SIZE]; free(event->program_result); event->program_result = NULL; util_strlcpy(program, &rules->buf[cur->key.value_off], sizeof(program)); udev_event_apply_format(event, program, sizeof(program)); envp = udev_device_get_properties_envp(event->dev); info(event->udev, "PROGRAM '%s' %s:%u\n", program, &rules->buf[rule->rule.filename_off], rule->rule.filename_line); if (util_run_program(event->udev, program, envp, result, sizeof(result), NULL) != 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, ALLOWED_CHARS_INPUT); if (count > 0) info(event->udev, "%i character(s) replaced\n" , count); } event->program_result = strdup(result); dbg(event->udev, "storing result '%s'\n", event->program_result); if (cur->key.op == OP_NOMATCH) goto nomatch; } break; } case TK_M_IMPORT_FILE: { char import[UTIL_PATH_SIZE]; util_strlcpy(import, &rules->buf[cur->key.value_off], sizeof(import)); udev_event_apply_format(event, 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]; util_strlcpy(import, &rules->buf[cur->key.value_off], sizeof(import)); udev_event_apply_format(event, import, sizeof(import)); info(event->udev, "IMPORT '%s' %s:%u\n", import, &rules->buf[rule->rule.filename_off], rule->rule.filename_line); if (import_program_into_properties(event->dev, import) != 0) if (cur->key.op != OP_NOMATCH) goto nomatch; break; } case TK_M_IMPORT_PARENT: { char import[UTIL_PATH_SIZE]; util_strlcpy(import, &rules->buf[cur->key.value_off], sizeof(import)); udev_event_apply_format(event, 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_IGNORE_DEVICE: event->ignore_device = 1; return 0; break; case TK_A_STRING_ESCAPE_NONE: esc = ESCAPE_NONE; break; case TK_A_STRING_ESCAPE_REPLACE: esc = ESCAPE_REPLACE; break; case TK_A_NUM_FAKE_PART: if (strcmp(udev_device_get_subsystem(event->dev), "block") != 0) break; if (udev_device_get_sysnum(event->dev) != NULL) break; udev_device_set_num_fake_partitions(event->dev, cur->key.num_fake_part); 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 = 1; util_strlcpy(owner, &rules->buf[cur->key.value_off], sizeof(owner)); udev_event_apply_format(event, owner, sizeof(owner)); event->uid = util_lookup_user(event->udev, owner); info(event->udev, "OWNER %u %s:%u\n", event->uid, &rules->buf[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 = 1; util_strlcpy(group, &rules->buf[cur->key.value_off], sizeof(group)); udev_event_apply_format(event, group, sizeof(group)); event->gid = util_lookup_group(event->udev, group); info(event->udev, "GROUP %u %s:%u\n", event->gid, &rules->buf[rule->rule.filename_off], rule->rule.filename_line); break; } case TK_A_MODE: { char mode[UTIL_NAME_SIZE]; char *endptr; if (event->mode_final) break; if (cur->key.op == OP_ASSIGN_FINAL) event->mode_final = 1; util_strlcpy(mode, &rules->buf[cur->key.value_off], sizeof(mode)); udev_event_apply_format(event, mode, sizeof(mode)); event->mode = strtol(mode, &endptr, 8); if (endptr[0] != '\0') { err(event->udev, "invalide mode '%s' set default mode 0660\n", mode); event->mode = 0660; } info(event->udev, "MODE %#o %s:%u\n", event->mode, &rules->buf[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 = 1; event->uid = cur->key.uid; info(event->udev, "OWNER %u %s:%u\n", event->uid, &rules->buf[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 = 1; event->gid = cur->key.gid; info(event->udev, "GROUP %u %s:%u\n", event->gid, &rules->buf[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 = 1; event->mode = cur->key.mode; info(event->udev, "MODE %#o %s:%u\n", event->mode, &rules->buf[rule->rule.filename_off], rule->rule.filename_line); break; case TK_A_ENV: { const char *name = &rules->buf[cur->key.attr_off]; char *value = &rules->buf[cur->key.value_off]; if (value[0] != '\0') { char temp_value[UTIL_NAME_SIZE]; struct udev_list_entry *entry; util_strlcpy(temp_value, value, sizeof(temp_value)); udev_event_apply_format(event, temp_value, sizeof(temp_value)); entry = udev_device_add_property(event->dev, name, temp_value); /* store in db */ udev_list_entry_set_flag(entry, 1); } else { udev_device_add_property(event->dev, name, NULL); } break; } case TK_A_NAME: { const char *name = &rules->buf[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 = 1; if (name[0] == '\0') { free(event->name); event->name = NULL; break; } util_strlcpy(name_str, name, sizeof(name_str)); udev_event_apply_format(event, name_str, sizeof(name_str)); if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) { count = util_replace_chars(name_str, ALLOWED_CHARS_FILE); if (count > 0) info(event->udev, "%i character(s) replaced\n", count); free(event->name); event->name = strdup(name_str); info(event->udev, "NAME '%s' %s:%u\n", event->name, &rules->buf[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 = 1; 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 */ util_strlcpy(temp, &rules->buf[cur->key.value_off], sizeof(temp)); udev_event_apply_format(event, temp, sizeof(temp)); if (esc == ESCAPE_UNSET) count = util_replace_chars(temp, ALLOWED_CHARS_FILE " "); else if (esc == ESCAPE_REPLACE) count = util_replace_chars(temp, ALLOWED_CHARS_FILE); if (count > 0) info(event->udev, "%i character(s) replaced\n" , count); dbg(event->udev, "rule applied, added symlink(s) '%s'\n", temp); pos = temp; while (isspace(pos[0])) pos++; next = strchr(pos, ' '); while (next) { next[0] = '\0'; info(event->udev, "LINK '%s' %s:%u\n", pos, &rules->buf[rule->rule.filename_off], rule->rule.filename_line); util_strlcpy(filename, udev_get_dev_path(event->udev), sizeof(filename)); util_strlcat(filename, "/", sizeof(filename)); util_strlcat(filename, pos, sizeof(filename)); udev_device_add_devlink(event->dev, filename); while (isspace(next[1])) next++; pos = &next[1]; next = strchr(pos, ' '); } if (pos[0] != '\0') { info(event->udev, "LINK '%s' %s:%u\n", pos, &rules->buf[rule->rule.filename_off], rule->rule.filename_line); util_strlcpy(filename, udev_get_dev_path(event->udev), sizeof(filename)); util_strlcat(filename, "/", sizeof(filename)); util_strlcat(filename, pos, sizeof(filename)); udev_device_add_devlink(event->dev, filename); } } break; case TK_A_EVENT_TIMEOUT: udev_device_set_event_timeout(event->dev, cur->key.event_timeout); break; case TK_A_IGNORE_REMOVE: udev_device_set_ignore_remove(event->dev, 1); break; case TK_A_ATTR: { const char *key_name = &rules->buf[cur->key.attr_off]; char attr[UTIL_PATH_SIZE]; char value[UTIL_NAME_SIZE]; FILE *f; util_strlcpy(attr, key_name, sizeof(attr)); if (util_resolve_subsys_kernel(event->udev, key_name, attr, sizeof(attr), 0) != 0) { util_strlcpy(attr, udev_device_get_syspath(event->dev), sizeof(attr)); util_strlcat(attr, "/", sizeof(attr)); util_strlcat(attr, key_name, sizeof(attr)); } attr_subst_subdir(attr, sizeof(attr)); util_strlcpy(value, &rules->buf[cur->key.value_off], sizeof(value)); udev_event_apply_format(event, value, sizeof(value)); info(event->udev, "ATTR '%s' writing '%s' %s:%u\n", attr, value, &rules->buf[rule->rule.filename_off], rule->rule.filename_line); f = fopen(attr, "w"); if (f != NULL) { if (!event->test) if (fprintf(f, "%s", value) <= 0) err(event->udev, "error writing ATTR{%s}: %m\n", attr); fclose(f); } else { err(event->udev, "error opening ATTR{%s} for writing: %m\n", attr); } break; } case TK_A_RUN: { struct udev_list_entry *list_entry; if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL) udev_list_cleanup_entries(event->udev, &event->run_list); info(event->udev, "RUN '%s' %s:%u\n", &rules->buf[cur->key.value_off], &rules->buf[rule->rule.filename_off], rule->rule.filename_line); list_entry = udev_list_entry_add(event->udev, &event->run_list, &rules->buf[cur->key.value_off], NULL, 1, 0); if (cur->key.ignore_error) udev_list_entry_set_flag(list_entry, 1); break; } case TK_A_GOTO: cur = &rules->tokens[cur->key.rule_goto]; continue; case TK_A_LAST_RULE: case TK_END: return 0; case TK_M_PARENTS_MIN: case TK_M_PARENTS_MAX: case TK_M_MAX: case TK_UNSET: err(rules->udev, "wrong type %u\n", cur->type); goto nomatch; } cur++; continue; nomatch: /* fast-forward to next rule */ idx = rule->rule.next_rule; if (idx == 0) return 0; dbg(rules->udev, "forward to rule: %u\n", idx); cur = &rules->tokens[idx]; } }