From 5f72c470ad244020f65784c33eb6bcd4ae149403 Mon Sep 17 00:00:00 2001 From: "kay.sievers@vrfy.org" Date: Mon, 29 Nov 2004 13:44:01 +0100 Subject: [PATCH] [PATCH] simplify permission handling Initialize the defaults in udev_config.c instead of namedev.c. Replace macro by expanded code. Switch to mode_t instead of string value. Add and clarify some comments. --- namedev.c | 108 +++++++++++++++++++++--------------------------- namedev.h | 18 +++----- namedev_parse.c | 14 +++++-- udev.h | 14 +++---- udev_config.c | 39 +++++++++-------- 5 files changed, 91 insertions(+), 102 deletions(-) diff --git a/namedev.c b/namedev.c index c043cf33..0bc28bd0 100644 --- a/namedev.c +++ b/namedev.c @@ -101,7 +101,7 @@ static int strcmp_pattern(const char *p, const char *s) return 1; } -static struct perm_device *find_perm(char *name) +static struct perm_device *find_perm_entry(const char *name) { struct perm_device *perm; @@ -113,32 +113,6 @@ static struct perm_device *find_perm(char *name) return NULL; } -static mode_t get_default_mode(void) -{ - mode_t mode = 0600; /* default to owner rw only */ - - if (strlen(default_mode_str) != 0) - mode = strtol(default_mode_str, NULL, 8); - - return mode; -} - -static char *get_default_owner(void) -{ - if (strlen(default_owner_str) == 0) - strfieldcpy(default_owner_str, "root"); - - return default_owner_str; -} - -static char *get_default_group(void) -{ - if (strlen(default_group_str) == 0) - strfieldcpy(default_group_str, "root"); - - return default_group_str; -} - /* extract possible {attr} and move str behind it */ static char *get_format_attribute(char **str) { @@ -586,7 +560,8 @@ static int match_place(struct config_device *dev, struct sysfs_class_device *cla return 0; } -static int match_rule(struct config_device *dev, struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device) +static int match_rule(struct udevice *udev, struct config_device *dev, + struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device) { while (1) { /* check for matching bus value */ @@ -595,7 +570,8 @@ static int match_rule(struct config_device *dev, struct sysfs_class_device *clas dbg("device has no bus"); goto try_parent; } - dbg("check for " FIELD_BUS " dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus); + dbg("check for " FIELD_BUS " dev->bus='%s' sysfs_device->bus='%s'", + dev->bus, sysfs_device->bus); if (strcmp_pattern(dev->bus, sysfs_device->bus) != 0) { dbg(FIELD_BUS " is not matching"); goto try_parent; @@ -606,7 +582,8 @@ static int match_rule(struct config_device *dev, struct sysfs_class_device *clas /* check for matching kernel name */ if (dev->kernel[0] != '\0') { - dbg("check for " FIELD_KERNEL " dev->kernel='%s' class_dev->name='%s'", dev->kernel, class_dev->name); + dbg("check for " FIELD_KERNEL " dev->kernel='%s' class_dev->name='%s'", + dev->kernel, class_dev->name); if (strcmp_pattern(dev->kernel, class_dev->name) != 0) { dbg(FIELD_KERNEL " is not matching"); goto try_parent; @@ -617,7 +594,8 @@ static int match_rule(struct config_device *dev, struct sysfs_class_device *clas /* check for matching subsystem */ if (dev->subsystem[0] != '\0') { - dbg("check for " FIELD_SUBSYSTEM " dev->subsystem='%s' class_dev->name='%s'", dev->subsystem, class_dev->name); + dbg("check for " FIELD_SUBSYSTEM " dev->subsystem='%s' class_dev->name='%s'", + dev->subsystem, class_dev->name); if (strcmp_pattern(dev->subsystem, udev->subsystem) != 0) { dbg(FIELD_SUBSYSTEM " is not matching"); goto try_parent; @@ -628,7 +606,8 @@ static int match_rule(struct config_device *dev, struct sysfs_class_device *clas /* check for matching driver */ if (dev->driver[0] != '\0') { - dbg("check for " FIELD_DRIVER " dev->driver='%s' sysfs_device->driver_name='%s'", dev->driver, sysfs_device->driver_name); + dbg("check for " FIELD_DRIVER " dev->driver='%s' sysfs_device->driver_name='%s'", + dev->driver, sysfs_device->driver_name); if (strcmp_pattern(dev->driver, sysfs_device->driver_name) != 0) { dbg(FIELD_DRIVER " is not matching"); goto try_parent; @@ -757,13 +736,15 @@ int namedev_name_device(struct udevice *udev, struct sysfs_class_device *class_d /* look for a matching rule to apply */ list_for_each_entry(dev, &config_device_list, node) { dbg("process rule"); - if (match_rule(dev, class_dev, udev, sysfs_device) == 0) { + if (match_rule(udev, dev, class_dev, sysfs_device) == 0) { + /* empty name and symlink will not create any node */ if (dev->name[0] == '\0' && dev->symlink[0] == '\0') { info("configured rule in '%s' at line %i applied, '%s' is ignored", dev->config_file, dev->config_line, udev->kernel_name); return -1; } + /* collect symlinks for the final matching rule */ if (dev->symlink[0] != '\0') { char temp[NAME_SIZE]; @@ -776,6 +757,7 @@ int namedev_name_device(struct udevice *udev, struct sysfs_class_device *class_d strfieldcat(udev->symlink, temp); } + /* rule matches */ if (dev->name[0] != '\0') { /* apply all_partitions flag only at a main block device */ if (dev->partitions > 0 && @@ -784,45 +766,51 @@ int namedev_name_device(struct udevice *udev, struct sysfs_class_device *class_d info("configured rule in '%s' at line %i applied, '%s' becomes '%s'", dev->config_file, dev->config_line, udev->kernel_name, dev->name); + strfieldcpy(udev->name, dev->name); - goto found; + apply_format(udev, udev->name, sizeof(udev->name), class_dev, sysfs_device); + strfieldcpy(udev->config_file, dev->config_file); + udev->config_line = dev->config_line; + udev->ignore_remove = dev->ignore_remove; + + if (udev->type == 'n') + goto done; + + udev->partitions = dev->partitions; + udev->mode = dev->mode; + strfieldcpy(udev->owner, dev->owner); + strfieldcpy(udev->group, dev->group); + + goto perms; } } } - /* no rule was found so we use the kernel name */ - strfieldcpy(udev->name, udev->kernel_name); - if (udev->type == 'n') - goto done; - else - goto perms; -found: - apply_format(udev, udev->name, sizeof(udev->name), class_dev, sysfs_device); - strfieldcpy(udev->config_file, dev->config_file); - udev->config_line = dev->config_line; + /* no rule matched, so we use the kernel name */ + strfieldcpy(udev->name, udev->kernel_name); if (udev->type == 'n') goto done; - udev->partitions = dev->partitions; - udev->ignore_remove = dev->ignore_remove; - - /* get permissions given in rule */ - set_empty_perms(udev, dev->mode, - dev->owner, - dev->group); - perms: - /* get permissions given in config file or set defaults */ - perm = find_perm(udev->name); + /* apply permissions from permissions file to empty fields */ + perm = find_perm_entry(udev->name); if (perm != NULL) { - set_empty_perms(udev, perm->mode, - perm->owner, - perm->group); + if (udev->mode == 0000) + udev->mode = perm->mode; + if (udev->owner[0] == '\0') + strfieldcpy(udev->owner, perm->owner); + if (udev->group[0] == '\0') + strfieldcpy(udev->group, perm->group); } - set_empty_perms(udev, get_default_mode(), - get_default_owner(), - get_default_group()); + + /* apply permissions from config to empty fields */ + if (udev->mode == 0000) + udev->mode = default_mode; + if (udev->owner[0] == '\0') + strfieldcpy(udev->owner, default_owner); + if (udev->group[0] == '\0') + strfieldcpy(udev->group, default_group); dbg("name, '%s' is going to have owner='%s', group='%s', mode = %#o", udev->name, udev->owner, udev->group, udev->mode); diff --git a/namedev.h b/namedev.h index 8e552c85..e2927924 100644 --- a/namedev.h +++ b/namedev.h @@ -60,14 +60,6 @@ struct sysfs_class_device; #define RULEFILE_SUFFIX ".rules" #define PERMFILE_SUFFIX ".permissions" -#define set_empty_perms(dev, m, o, g) \ - if (dev->mode == 0) \ - dev->mode = m; \ - if (dev->owner[0] == '\0') \ - strfieldcpy(dev->owner, o); \ - if (dev->group[0] == '\0') \ - strfieldcpy(dev->group, g); - struct sysfs_pair { char file[FILE_SIZE]; char value[VALUE_SIZE]; @@ -87,9 +79,9 @@ struct config_device { char name[NAME_SIZE]; char symlink[NAME_SIZE]; struct sysfs_pair sysfs_pair[MAX_SYSFS_PAIRS]; - char owner[OWNER_SIZE]; - char group[GROUP_SIZE]; - unsigned int mode; + char owner[USER_SIZE]; + char group[USER_SIZE]; + mode_t mode; int partitions; int ignore_remove; char config_file[NAME_SIZE]; @@ -100,8 +92,8 @@ struct perm_device { struct list_head node; char name[NAME_SIZE]; - char owner[OWNER_SIZE]; - char group[GROUP_SIZE]; + char owner[USER_SIZE]; + char group[USER_SIZE]; unsigned int mode; }; diff --git a/namedev_parse.c b/namedev_parse.c index d39141bf..5b8c5ab2 100644 --- a/namedev_parse.c +++ b/namedev_parse.c @@ -79,12 +79,19 @@ static int add_perm_dev(struct perm_device *new_dev) struct perm_device *dev; struct perm_device *tmp_dev; - /* update the values if we already have the device */ + /* if we already have that entry, just update the values */ list_for_each_entry(dev, &perm_device_list, node) { if (strcmp(new_dev->name, dev->name) != 0) continue; - set_empty_perms(dev, new_dev->mode, new_dev->owner, new_dev->group); + /* don't overwrite values from earlier entries */ + if (dev->mode == 0000) + dev->mode = new_dev->mode; + if (dev->owner[0] == '\0') + strfieldcpy(dev->owner, new_dev->owner); + if (dev->owner[0] == '\0') + strfieldcpy(dev->group, new_dev->group); + return 0; } @@ -95,7 +102,8 @@ static int add_perm_dev(struct perm_device *new_dev) memcpy(tmp_dev, new_dev, sizeof(*tmp_dev)); list_add_tail(&tmp_dev->node, &perm_device_list); - //dump_perm_dev(tmp_dev); + /* dump_perm_dev(tmp_dev); */ + return 0; } diff --git a/udev.h b/udev.h index 0703b884..cff991e5 100644 --- a/udev.h +++ b/udev.h @@ -30,9 +30,7 @@ #define COMMENT_CHARACTER '#' #define NAME_SIZE 256 -#define OWNER_SIZE 32 -#define GROUP_SIZE 32 -#define MODE_SIZE 8 +#define USER_SIZE 32 #define ACTION_SIZE 32 #define DEVPATH_SIZE 256 @@ -53,8 +51,8 @@ struct udevice { char name[NAME_SIZE]; char symlink[NAME_SIZE]; - char owner[OWNER_SIZE]; - char group[GROUP_SIZE]; + char owner[USER_SIZE]; + char group[USER_SIZE]; mode_t mode; char type; int major; @@ -86,9 +84,9 @@ extern char udev_db_path[PATH_MAX+NAME_MAX]; extern char udev_permissions_filename[PATH_MAX+NAME_MAX]; extern char udev_config_filename[PATH_MAX+NAME_MAX]; extern char udev_rules_filename[PATH_MAX+NAME_MAX]; -extern char default_mode_str[MODE_SIZE]; -extern char default_owner_str[OWNER_SIZE]; -extern char default_group_str[GROUP_SIZE]; +extern mode_t default_mode; +extern char default_owner[USER_SIZE]; +extern char default_group[USER_SIZE]; extern int udev_log; extern int udev_dev_d; extern int udev_hotplug_d; diff --git a/udev_config.c b/udev_config.c index 9549471b..62eb728e 100644 --- a/udev_config.c +++ b/udev_config.c @@ -46,15 +46,15 @@ char udev_db_path[PATH_MAX+NAME_MAX]; char udev_permissions_filename[PATH_MAX+NAME_MAX]; char udev_rules_filename[PATH_MAX+NAME_MAX]; char udev_config_filename[PATH_MAX+NAME_MAX]; -char default_mode_str[MODE_SIZE]; -char default_owner_str[OWNER_SIZE]; -char default_group_str[GROUP_SIZE]; +mode_t default_mode; +char default_owner[USER_SIZE]; +char default_group[USER_SIZE]; int udev_log; int udev_dev_d; int udev_hotplug_d; -static int string_is_true(char *str) +static int string_is_true(const char *str) { if (strcasecmp(str, "true") == 0) return 1; @@ -67,16 +67,19 @@ static int string_is_true(char *str) static void init_variables(void) { - char *env; - - /* fill up the defaults. - * If any config values are specified, they will - * override these values. */ - strfieldcpy(udev_root, UDEV_ROOT); - strfieldcpy(udev_db_path, UDEV_DB); - strfieldcpy(udev_config_filename, UDEV_CONFIG_FILE); - strfieldcpy(udev_rules_filename, UDEV_RULES_FILE); - strfieldcpy(udev_permissions_filename, UDEV_PERMISSION_FILE); + const char *env; + + /* If any config values are specified, they will override these values. */ + strcpy(udev_root, UDEV_ROOT); + strcpy(udev_db_path, UDEV_DB); + strcpy(udev_config_filename, UDEV_CONFIG_FILE); + strcpy(udev_rules_filename, UDEV_RULES_FILE); + strcpy(udev_permissions_filename, UDEV_PERMISSION_FILE); + + strcpy(default_owner, "root"); + strcpy(default_group, "root"); + default_mode = 0600; + udev_log = string_is_true(UDEV_LOG_DEFAULT); udev_dev_d = 1; @@ -210,17 +213,17 @@ static int parse_config_file(void) } if (strcasecmp(variable, "default_mode") == 0) { - strfieldcpy(default_mode_str, value); + default_mode = strtol(value, NULL, 8); continue; } if (strcasecmp(variable, "default_owner") == 0) { - strfieldcpy(default_owner_str, value); + strfieldcpy(default_owner, value); continue; } if (strcasecmp(variable, "default_group") == 0) { - strfieldcpy(default_group_str, value); + strfieldcpy(default_group, value); continue; } @@ -274,7 +277,7 @@ static void get_dirs(void) dbg("udev_db_path = %s", udev_db_path); dbg("udev_rules_filename = %s", udev_rules_filename); dbg("udev_permissions_filename = %s", udev_permissions_filename); - dbg("udev_log_str = %d", udev_log); + dbg("udev_log = %d", udev_log); } void udev_init_config(void) -- 2.39.5