chiark / gitweb /
Be more careful when checking for empty files
[elogind.git] / src / udev / udev-rules.c
index 52634f137d4352f146447f9dcbb9060648412812..9864016d1447c1ab041ead6ed0d515d22f73d5a8 100644 (file)
@@ -46,9 +46,14 @@ struct uid_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;
-        char **dirs;
         usec_t dirs_ts_usec;
         int resolve_names;
 
@@ -435,8 +440,6 @@ static void dump_rules(struct udev_rules *rules)
                 dump_token(rules, &rules->tokens[i]);
 }
 #else
-static inline const char *operation_str(enum operation_type type) { return NULL; }
-static inline const char *token_str(enum token_type type) { return NULL; }
 static inline void dump_token(struct udev_rules *rules, struct token *token) {}
 static inline void dump_rules(struct udev_rules *rules) {}
 #endif /* DEBUG */
@@ -865,7 +868,7 @@ static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
         struct token *token = &rule_tmp->token[rule_tmp->token_cur];
         const char *attr = NULL;
 
-        memset(token, 0x00, sizeof(struct token));
+        memzero(token, sizeof(struct token));
 
         switch (type) {
         case TK_M_ACTION:
@@ -895,6 +898,7 @@ static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
         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:
@@ -938,9 +942,6 @@ static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
         case TK_A_MODE_ID:
                 token->key.mode = *(mode_t *)data;
                 break;
-        case TK_A_STATIC_NODE:
-                token->key.value_off = rules_add_string(rule_tmp->rules, value);
-                break;
         case TK_M_EVENT_TIMEOUT:
                 token->key.event_timeout = *(int *)data;
                 break;
@@ -988,7 +989,7 @@ static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
         }
 
         if (attr != NULL) {
-                /* check if property/attribut name has substitution chars */
+                /* check if property/attribute name has substitution chars */
                 if (attr[0] == '[')
                         token->key.attrsubst = SB_SUBSYS;
                 else if (strchr(attr, '%') != NULL || strchr(attr, '$') != NULL)
@@ -1049,7 +1050,7 @@ static int add_rule(struct udev_rules *rules, char *line,
         const char *attr;
         struct rule_tmp rule_tmp;
 
-        memset(&rule_tmp, 0x00, sizeof(struct 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 */
@@ -1141,7 +1142,7 @@ static int add_rule(struct udev_rules *rules, char *line,
                 }
 
                 if (startswith(key, "ATTR{")) {
-                        attr = get_key_attribute(rules->udev, key + sizeof("ATTR")-1);
+                        attr = get_key_attribute(rules->udev, key + strlen("ATTR"));
                         if (attr == NULL) {
                                 log_error("error parsing ATTR attribute");
                                 goto invalid;
@@ -1155,7 +1156,7 @@ static int add_rule(struct udev_rules *rules, char *line,
                 }
 
                 if (startswith(key, "SECLABEL{")) {
-                        attr = get_key_attribute(rules->udev, key + sizeof("SECLABEL")-1);
+                        attr = get_key_attribute(rules->udev, key + strlen("SECLABEL"));
                         if (!attr) {
                                 log_error("error parsing SECLABEL attribute");
                                 goto invalid;
@@ -1197,7 +1198,7 @@ static int add_rule(struct udev_rules *rules, char *line,
                                 log_error("invalid ATTRS operation");
                                 goto invalid;
                         }
-                        attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);
+                        attr = get_key_attribute(rules->udev, key + strlen("ATTRS"));
                         if (attr == NULL) {
                                 log_error("error parsing ATTRS attribute");
                                 goto invalid;
@@ -1222,7 +1223,7 @@ static int add_rule(struct udev_rules *rules, char *line,
                 }
 
                 if (startswith(key, "ENV{")) {
-                        attr = get_key_attribute(rules->udev, key + sizeof("ENV")-1);
+                        attr = get_key_attribute(rules->udev, key + strlen("ENV"));
                         if (attr == NULL) {
                                 log_error("error parsing ENV attribute");
                                 goto invalid;
@@ -1281,7 +1282,7 @@ static int add_rule(struct udev_rules *rules, char *line,
                 }
 
                 if (startswith(key, "IMPORT")) {
-                        attr = get_key_attribute(rules->udev, key + sizeof("IMPORT")-1);
+                        attr = get_key_attribute(rules->udev, key + strlen("IMPORT"));
                         if (attr == NULL) {
                                 log_error("IMPORT{} type missing, ignoring IMPORT %s:%u", filename, lineno);
                                 continue;
@@ -1327,7 +1328,7 @@ static int add_rule(struct udev_rules *rules, char *line,
                                 log_error("invalid TEST operation");
                                 goto invalid;
                         }
-                        attr = get_key_attribute(rules->udev, key + sizeof("TEST")-1);
+                        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);
@@ -1338,7 +1339,7 @@ static int add_rule(struct udev_rules *rules, char *line,
                 }
 
                 if (startswith(key, "RUN")) {
-                        attr = get_key_attribute(rules->udev, key + sizeof("RUN")-1);
+                        attr = get_key_attribute(rules->udev, key + strlen("RUN"));
                         if (attr == NULL)
                                 attr = "program";
 
@@ -1532,15 +1533,19 @@ static int parse_file(struct udev_rules *rules, const char *filename)
         int line_nr = 0;
         unsigned int i;
 
-        if (null_or_empty_path(filename)) {
-                log_debug("skip empty file: %s", filename);
-                return 0;
+        f = fopen(filename, "re");
+        if (!f) {
+                if (errno == ENOENT)
+                        return 0;
+                else
+                        return -errno;
         }
-        log_debug("read rules file: %s", filename);
 
-        f = fopen(filename, "re");
-        if (f == NULL)
-                return -1;
+        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);
@@ -1612,7 +1617,7 @@ struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
         char **files, **f;
         int r;
 
-        rules = calloc(1, sizeof(struct udev_rules));
+        rules = new0(struct udev_rules, 1);
         if (rules == NULL)
                 return NULL;
         rules->udev = udev;
@@ -1629,23 +1634,9 @@ struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
         if (!rules->strbuf)
                 return udev_rules_unref(rules);
 
-        rules->dirs = strv_new("/etc/udev/rules.d",
-                               "/run/udev/rules.d",
-                               UDEVLIBEXECDIR "/rules.d",
-                               NULL);
-        if (!rules->dirs) {
-                log_error("failed to build config directory array");
-                return udev_rules_unref(rules);
-        }
-        if (!path_strv_canonicalize(rules->dirs)) {
-                log_error("failed to canonicalize config directories");
-                return udev_rules_unref(rules);
-        }
-        strv_uniq(rules->dirs);
-
         udev_rules_check_timestamp(rules);
 
-        r = conf_files_list_strv(&files, ".rules", NULL, (const char **)rules->dirs);
+        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);
@@ -1663,7 +1654,7 @@ struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
 
         strv_free(files);
 
-        memset(&end_token, 0x00, sizeof(struct token));
+        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",
@@ -1697,7 +1688,6 @@ struct udev_rules *udev_rules_unref(struct udev_rules *rules)
         strbuf_cleanup(rules->strbuf);
         free(rules->uids);
         free(rules->gids);
-        strv_free(rules->dirs);
         free(rules);
         return NULL;
 }
@@ -1707,7 +1697,7 @@ bool udev_rules_check_timestamp(struct udev_rules *rules)
         if (!rules)
                 return false;
 
-        return paths_check_timestamp(rules->dirs, &rules->dirs_ts_usec, true);
+        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)
@@ -2041,7 +2031,7 @@ int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event
                 case TK_M_PROGRAM: {
                         char program[UTIL_PATH_SIZE];
                         char **envp;
-                        char result[UTIL_PATH_SIZE];
+                        char result[UTIL_LINE_SIZE];
 
                         free(event->program_result);
                         event->program_result = NULL;
@@ -2569,17 +2559,18 @@ int udev_rules_apply_static_dev_perms(struct udev_rules *rules)
                         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)
-                                goto next;
+                                break;
                         if (!S_ISBLK(stats.st_mode) && !S_ISCHR(stats.st_mode))
-                                goto next;
+                                break;
 
+                        /* export the tags to a directory as symlinks, allowing otherwise dead nodes to be tagged */
                         if (tags) {
-                                /* Export the tags to a directory as symlinks, allowing otherwise dead nodes to be tagged */
-
                                 STRV_FOREACH(t, tags) {
                                         _cleanup_free_ char *unescaped_filename = NULL;
 
@@ -2604,7 +2595,7 @@ int udev_rules_apply_static_dev_perms(struct udev_rules *rules)
 
                         /* don't touch the permissions if only the tags were set */
                         if (mode == 0 && uid == 0 && gid == 0)
-                                goto next;
+                                break;
 
                         if (mode == 0) {
                                 if (gid > 0)