| /*** |
| This file is part of systemd. |
| |
| Copyright 2008-2012 Kay Sievers <kay@vrfy.org> |
| |
| systemd is free software; you can redistribute it and/or modify it |
| under the terms of the GNU Lesser General Public License as published by |
| the Free Software Foundation; either version 2.1 of the License, or |
| (at your option) any later version. |
| |
| systemd 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 |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public License |
| along with systemd; If not, see <http://www.gnu.org/licenses/>. |
| ***/ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <stddef.h> |
| #include <unistd.h> |
| #include <stdbool.h> |
| #include <errno.h> |
| #include <string.h> |
| #include <dirent.h> |
| #include <fcntl.h> |
| #include <ctype.h> |
| #include <net/if.h> |
| #include <sys/stat.h> |
| #include <sys/ioctl.h> |
| #include <sys/socket.h> |
| #include <linux/sockios.h> |
| |
| #include "libudev.h" |
| #include "libudev-private.h" |
| |
| static int udev_device_set_devnode(struct udev_device *udev_device, const char *devnode); |
| |
| /** |
| * SECTION:libudev-device |
| * @short_description: kernel sys devices |
| * |
| * Representation of kernel sys devices. Devices are uniquely identified |
| * by their syspath, every device has exactly one path in the kernel sys |
| * filesystem. Devices usually belong to a kernel subsystem, and have |
| * a unique name inside that subsystem. |
| */ |
| |
| /** |
| * udev_device: |
| * |
| * Opaque object representing one kernel sys device. |
| */ |
| struct udev_device { |
| struct udev *udev; |
| struct udev_device *parent_device; |
| char *syspath; |
| const char *devpath; |
| char *sysname; |
| const char *sysnum; |
| char *devnode; |
| mode_t devnode_mode; |
| uid_t devnode_uid; |
| gid_t devnode_gid; |
| char *subsystem; |
| char *devtype; |
| char *driver; |
| char *action; |
| char *devpath_old; |
| char *id_filename; |
| char **envp; |
| char *monitor_buf; |
| size_t monitor_buf_len; |
| struct udev_list devlinks_list; |
| struct udev_list properties_list; |
| struct udev_list sysattr_value_list; |
| struct udev_list sysattr_list; |
| struct udev_list tags_list; |
| unsigned long long int seqnum; |
| usec_t usec_initialized; |
| int devlink_priority; |
| int refcount; |
| dev_t devnum; |
| int ifindex; |
| int watch_handle; |
| int maj, min; |
| bool parent_set; |
| bool subsystem_set; |
| bool devtype_set; |
| bool devlinks_uptodate; |
| bool envp_uptodate; |
| bool tags_uptodate; |
| bool driver_set; |
| bool info_loaded; |
| bool db_loaded; |
| bool uevent_loaded; |
| bool is_initialized; |
| bool sysattr_list_read; |
| bool db_persist; |
| }; |
| |
| /** |
| * udev_device_get_seqnum: |
| * @udev_device: udev device |
| * |
| * This is only valid if the device was received through a monitor. Devices read from |
| * sys do not have a sequence number. |
| * |
| * Returns: the kernel event sequence number, or 0 if there is no sequence number available. |
| **/ |
| _public_ unsigned long long int udev_device_get_seqnum(struct udev_device *udev_device) |
| { |
| if (udev_device == NULL) |
| return 0; |
| return udev_device->seqnum; |
| } |
| |
| static int udev_device_set_seqnum(struct udev_device *udev_device, unsigned long long int seqnum) |
| { |
| char num[32]; |
| |
| udev_device->seqnum = seqnum; |
| snprintf(num, sizeof(num), "%llu", seqnum); |
| udev_device_add_property(udev_device, "SEQNUM", num); |
| return 0; |
| } |
| |
| int udev_device_get_ifindex(struct udev_device *udev_device) |
| { |
| if (!udev_device->info_loaded) |
| udev_device_read_uevent_file(udev_device); |
| return udev_device->ifindex; |
| } |
| |
| static int udev_device_set_ifindex(struct udev_device *udev_device, int ifindex) |
| { |
| char num[32]; |
| |
| udev_device->ifindex = ifindex; |
| snprintf(num, sizeof(num), "%u", ifindex); |
| udev_device_add_property(udev_device, "IFINDEX", num); |
| return 0; |
| } |
| |
| /** |
| * udev_device_get_devnum: |
| * @udev_device: udev device |
| * |
| * Get the device major/minor number. |
| * |
| * Returns: the dev_t number. |
| **/ |
| _public_ dev_t udev_device_get_devnum(struct udev_device *udev_device) |
| { |
| if (udev_device == NULL) |
| return makedev(0, 0); |
| if (!udev_device->info_loaded) |
| udev_device_read_uevent_file(udev_device); |
| return udev_device->devnum; |
| } |
| |
| static int udev_device_set_devnum(struct udev_device *udev_device, dev_t devnum) |
| { |
| char num[32]; |
| |
| udev_device->devnum = devnum; |
| |
| snprintf(num, sizeof(num), "%u", major(devnum)); |
| udev_device_add_property(udev_device, "MAJOR", num); |
| snprintf(num, sizeof(num), "%u", minor(devnum)); |
| udev_device_add_property(udev_device, "MINOR", num); |
| return 0; |
| } |
| |
| const char *udev_device_get_devpath_old(struct udev_device *udev_device) |
| { |
| return udev_device->devpath_old; |
| } |
| |
| static int udev_device_set_devpath_old(struct udev_device *udev_device, const char *devpath_old) |
| { |
| const char *pos; |
| |
| free(udev_device->devpath_old); |
| udev_device->devpath_old = strdup(devpath_old); |
| if (udev_device->devpath_old == NULL) |
| return -ENOMEM; |
| udev_device_add_property(udev_device, "DEVPATH_OLD", udev_device->devpath_old); |
| |
| pos = strrchr(udev_device->devpath_old, '/'); |
| if (pos == NULL) |
| return -EINVAL; |
| return 0; |
| } |
| |
| /** |
| * udev_device_get_driver: |
| * @udev_device: udev device |
| * |
| * Get the kernel driver name. |
| * |
| * Returns: the driver name string, or #NULL if there is no driver attached. |
| **/ |
| _public_ const char *udev_device_get_driver(struct udev_device *udev_device) |
| { |
| char driver[UTIL_NAME_SIZE]; |
| |
| if (udev_device == NULL) |
| return NULL; |
| if (!udev_device->driver_set) { |
| udev_device->driver_set = true; |
| if (util_get_sys_core_link_value(udev_device->udev, "driver", udev_device->syspath, driver, sizeof(driver)) > 0) |
| udev_device->driver = strdup(driver); |
| } |
| return udev_device->driver; |
| } |
| |
| static int udev_device_set_driver(struct udev_device *udev_device, const char *driver) |
| { |
| free(udev_device->driver); |
| udev_device->driver = strdup(driver); |
| if (udev_device->driver == NULL) |
| return -ENOMEM; |
| udev_device->driver_set = true; |
| udev_device_add_property(udev_device, "DRIVER", udev_device->driver); |
| return 0; |
| } |
| |
| /** |
| * udev_device_get_devtype: |
| * @udev_device: udev device |
| * |
| * Retrieve the devtype string of the udev device. |
| * |
| * Returns: the devtype name of the udev device, or #NULL if it can not be determined |
| **/ |
| _public_ const char *udev_device_get_devtype(struct udev_device *udev_device) |
| { |
| if (udev_device == NULL) |
| return NULL; |
| if (!udev_device->devtype_set) { |
| udev_device->devtype_set = true; |
| udev_device_read_uevent_file(udev_device); |
| } |
| return udev_device->devtype; |
| } |
| |
| static int udev_device_set_devtype(struct udev_device *udev_device, const char *devtype) |
| { |
| free(udev_device->devtype); |
| udev_device->devtype = strdup(devtype); |
| if (udev_device->devtype == NULL) |
| return -ENOMEM; |
| udev_device->devtype_set = true; |
| udev_device_add_property(udev_device, "DEVTYPE", udev_device->devtype); |
| return 0; |
| } |
| |
| int udev_device_set_subsystem(struct udev_device *udev_device, const char *subsystem) |
| { |
| free(udev_device->subsystem); |
| udev_device->subsystem = strdup(subsystem); |
| if (udev_device->subsystem == NULL) |
| return -ENOMEM; |
| udev_device->subsystem_set = true; |
| udev_device_add_property(udev_device, "SUBSYSTEM", udev_device->subsystem); |
| return 0; |
| } |
| |
| /** |
| * udev_device_get_subsystem: |
| * @udev_device: udev device |
| * |
| * Retrieve the subsystem string of the udev device. The string does not |
| * contain any "/". |
| * |
| * Returns: the subsystem name of the udev device, or #NULL if it can not be determined |
| **/ |
| _public_ const char *udev_device_get_subsystem(struct udev_device *udev_device) |
| { |
| char subsystem[UTIL_NAME_SIZE]; |
| |
| if (udev_device == NULL) |
| return NULL; |
| if (!udev_device->subsystem_set) { |
| udev_device->subsystem_set = true; |
| /* read "subsystem" link */ |
| if (util_get_sys_core_link_value(udev_device->udev, "subsystem", udev_device->syspath, subsystem, sizeof(subsystem)) > 0) { |
| udev_device_set_subsystem(udev_device, subsystem); |
| return udev_device->subsystem; |
| } |
| /* implicit names */ |
| if (startswith(udev_device->devpath, "/module/")) { |
| udev_device_set_subsystem(udev_device, "module"); |
| return udev_device->subsystem; |
| } |
| if (strstr(udev_device->devpath, "/drivers/") != NULL) { |
| udev_device_set_subsystem(udev_device, "drivers"); |
| return udev_device->subsystem; |
| } |
| if (startswith(udev_device->devpath, "/subsystem/") || |
| startswith(udev_device->devpath, "/class/") || |
| startswith(udev_device->devpath, "/bus/")) { |
| udev_device_set_subsystem(udev_device, "subsystem"); |
| return udev_device->subsystem; |
| } |
| } |
| return udev_device->subsystem; |
| } |
| |
| mode_t udev_device_get_devnode_mode(struct udev_device *udev_device) |
| { |
| if (!udev_device->info_loaded) |
| udev_device_read_uevent_file(udev_device); |
| return udev_device->devnode_mode; |
| } |
| |
| static int udev_device_set_devnode_mode(struct udev_device *udev_device, mode_t mode) |
| { |
| char num[32]; |
| |
| udev_device->devnode_mode = mode; |
| snprintf(num, sizeof(num), "%#o", mode); |
| udev_device_add_property(udev_device, "DEVMODE", num); |
| return 0; |
| } |
| |
| uid_t udev_device_get_devnode_uid(struct udev_device *udev_device) |
| { |
| if (!udev_device->info_loaded) |
| udev_device_read_uevent_file(udev_device); |
| return udev_device->devnode_uid; |
| } |
| |
| static int udev_device_set_devnode_uid(struct udev_device *udev_device, uid_t uid) |
| { |
| char num[32]; |
| |
| udev_device->devnode_uid = uid; |
| snprintf(num, sizeof(num), "%u", uid); |
| udev_device_add_property(udev_device, "DEVUID", num); |
| return 0; |
| } |
| |
| gid_t udev_device_get_devnode_gid(struct udev_device *udev_device) |
| { |
| if (!udev_device->info_loaded) |
| udev_device_read_uevent_file(udev_device); |
| return udev_device->devnode_gid; |
| } |
| |
| static int udev_device_set_devnode_gid(struct udev_device *udev_device, gid_t gid) |
| { |
| char num[32]; |
| |
| udev_device->devnode_gid = gid; |
| snprintf(num, sizeof(num), "%u", gid); |
| udev_device_add_property(udev_device, "DEVGID", num); |
| return 0; |
| } |
| |
| struct udev_list_entry *udev_device_add_property(struct udev_device *udev_device, const char *key, const char *value) |
| { |
| udev_device->envp_uptodate = false; |
| if (value == NULL) { |
| struct udev_list_entry *list_entry; |
| |
| list_entry = udev_device_get_properties_list_entry(udev_device); |
| list_entry = udev_list_entry_get_by_name(list_entry, key); |
| if (list_entry != NULL) |
| udev_list_entry_delete(list_entry); |
| return NULL; |
| } |
| return udev_list_entry_add(&udev_device->properties_list, key, value); |
| } |
| |
| static struct udev_list_entry *udev_device_add_property_from_string(struct udev_device *udev_device, const char *property) |
| { |
| char name[UTIL_LINE_SIZE]; |
| char *val; |
| |
| strscpy(name, sizeof(name), property); |
| val = strchr(name, '='); |
| if (val == NULL) |
| return NULL; |
| val[0] = '\0'; |
| val = &val[1]; |
| if (val[0] == '\0') |
| val = NULL; |
| return udev_device_add_property(udev_device, name, val); |
| } |
| |
| /* |
| * parse property string, and if needed, update internal values accordingly |
| * |
| * udev_device_add_property_from_string_parse_finish() needs to be |
| * called after adding properties, and its return value checked |
| * |
| * udev_device_set_info_loaded() needs to be set, to avoid trying |
| * to use a device without a DEVPATH set |
| */ |
| void udev_device_add_property_from_string_parse(struct udev_device *udev_device, const char *property) |
| { |
| if (startswith(property, "DEVPATH=")) { |
| char path[UTIL_PATH_SIZE]; |
| |
| strscpyl(path, sizeof(path), "/sys", &property[8], NULL); |
| udev_device_set_syspath(udev_device, path); |
| } else if (startswith(property, "SUBSYSTEM=")) { |
| udev_device_set_subsystem(udev_device, &property[10]); |
| } else if (startswith(property, "DEVTYPE=")) { |
| udev_device_set_devtype(udev_device, &property[8]); |
| } else if (startswith(property, "DEVNAME=")) { |
| udev_device_set_devnode(udev_device, &property[8]); |
| } else if (startswith(property, "DEVLINKS=")) { |
| char devlinks[UTIL_PATH_SIZE]; |
| char *slink; |
| char *next; |
| |
| strscpy(devlinks, sizeof(devlinks), &property[9]); |
| slink = devlinks; |
| next = strchr(slink, ' '); |
| while (next != NULL) { |
| next[0] = '\0'; |
| udev_device_add_devlink(udev_device, slink); |
| slink = &next[1]; |
| next = strchr(slink, ' '); |
| } |
| if (slink[0] != '\0') |
| udev_device_add_devlink(udev_device, slink); |
| } else if (startswith(property, "TAGS=")) { |
| char tags[UTIL_PATH_SIZE]; |
| char *next; |
| |
| strscpy(tags, sizeof(tags), &property[5]); |
| next = strchr(tags, ':'); |
| if (next != NULL) { |
| next++; |
| while (next[0] != '\0') { |
| char *tag; |
| |
| tag = next; |
| next = strchr(tag, ':'); |
| if (next == NULL) |
| break; |
| next[0] = '\0'; |
| next++; |
| udev_device_add_tag(udev_device, tag); |
| } |
| } |
| } else if (startswith(property, "USEC_INITIALIZED=")) { |
| udev_device_set_usec_initialized(udev_device, strtoull(&property[19], NULL, 10)); |
| } else if (startswith(property, "DRIVER=")) { |
| udev_device_set_driver(udev_device, &property[7]); |
| } else if (startswith(property, "ACTION=")) { |
| udev_device_set_action(udev_device, &property[7]); |
| } else if (startswith(property, "MAJOR=")) { |
| udev_device->maj = strtoull(&property[6], NULL, 10); |
| } else if (startswith(property, "MINOR=")) { |
| udev_device->min = strtoull(&property[6], NULL, 10); |
| } else if (startswith(property, "DEVPATH_OLD=")) { |
| udev_device_set_devpath_old(udev_device, &property[12]); |
| } else if (startswith(property, "SEQNUM=")) { |
| udev_device_set_seqnum(udev_device, strtoull(&property[7], NULL, 10)); |
| } else if (startswith(property, "IFINDEX=")) { |
| udev_device_set_ifindex(udev_device, strtoull(&property[8], NULL, 10)); |
| } else if (startswith(property, "DEVMODE=")) { |
| udev_device_set_devnode_mode(udev_device, strtoul(&property[8], NULL, 8)); |
| } else if (startswith(property, "DEVUID=")) { |
| udev_device_set_devnode_uid(udev_device, strtoul(&property[7], NULL, 10)); |
| } else if (startswith(property, "DEVGID=")) { |
| udev_device_set_devnode_gid(udev_device, strtoul(&property[7], NULL, 10)); |
| } else { |
| udev_device_add_property_from_string(udev_device, property); |
| } |
| } |
| |
| int udev_device_add_property_from_string_parse_finish(struct udev_device *udev_device) |
| { |
| if (udev_device->maj > 0) |
| udev_device_set_devnum(udev_device, makedev(udev_device->maj, udev_device->min)); |
| udev_device->maj = 0; |
| udev_device->min = 0; |
| |
| if (udev_device->devpath == NULL || udev_device->subsystem == NULL) |
| return -EINVAL; |
| return 0; |
| } |
| |
| /** |
| * udev_device_get_property_value: |
| * @udev_device: udev device |
| * @key: property name |
| * |
| * Get the value of a given property. |
| * |
| * Returns: the property string, or #NULL if there is no such property. |
| **/ |
| _public_ const char *udev_device_get_property_value(struct udev_device *udev_device, const char *key) |
| { |
| struct udev_list_entry *list_entry; |
| |
| if (udev_device == NULL) |
| return NULL; |
| if (key == NULL) |
| return NULL; |
| |
| list_entry = udev_device_get_properties_list_entry(udev_device); |
| list_entry = udev_list_entry_get_by_name(list_entry, key); |
| return udev_list_entry_get_value(list_entry); |
| } |
| |
| int udev_device_read_db(struct udev_device *udev_device, const char *dbfile) |
| { |
| char filename[UTIL_PATH_SIZE]; |
| char line[UTIL_LINE_SIZE]; |
| FILE *f; |
| |
| /* providing a database file will always force-load it */ |
| if (dbfile == NULL) { |
| const char *id; |
| |
| if (udev_device->db_loaded) |
| return 0; |
| udev_device->db_loaded = true; |
| |
| id = udev_device_get_id_filename(udev_device); |
| if (id == NULL) |
| return -1; |
| strscpyl(filename, sizeof(filename), "/run/udev/data/", id, NULL); |
| dbfile = filename; |
| } |
| |
| f = fopen(dbfile, "re"); |
| if (f == NULL) { |
| udev_dbg(udev_device->udev, "no db file to read %s: %m\n", dbfile); |
| return -errno; |
| } |
| |
| /* devices with a database entry are initialized */ |
| udev_device->is_initialized = true; |
| |
| while (fgets(line, sizeof(line), f)) { |
| ssize_t len; |
| const char *val; |
| struct udev_list_entry *entry; |
| |
| len = strlen(line); |
| if (len < 4) |
| break; |
| line[len-1] = '\0'; |
| val = &line[2]; |
| switch(line[0]) { |
| case 'S': |
| strscpyl(filename, sizeof(filename), "/dev/", val, NULL); |
| udev_device_add_devlink(udev_device, filename); |
| break; |
| case 'L': |
| udev_device_set_devlink_priority(udev_device, atoi(val)); |
| break; |
| case 'E': |
| entry = udev_device_add_property_from_string(udev_device, val); |
| udev_list_entry_set_num(entry, true); |
| break; |
| case 'G': |
| udev_device_add_tag(udev_device, val); |
| break; |
| case 'W': |
| udev_device_set_watch_handle(udev_device, atoi(val)); |
| break; |
| case 'I': |
| udev_device_set_usec_initialized(udev_device, strtoull(val, NULL, 10)); |
| break; |
| } |
| } |
| fclose(f); |
| |
| udev_dbg(udev_device->udev, "device %p filled with db file data\n", udev_device); |
| return 0; |
| } |
| |
| int udev_device_read_uevent_file(struct udev_device *udev_device) |
| { |
| char filename[UTIL_PATH_SIZE]; |
| FILE *f; |
| char line[UTIL_LINE_SIZE]; |
| int maj = 0; |
| int min = 0; |
| |
| if (udev_device->uevent_loaded) |
| return 0; |
| |
| strscpyl(filename, sizeof(filename), udev_device->syspath, "/uevent", NULL); |
| f = fopen(filename, "re"); |
| if (f == NULL) |
| return -errno; |
| udev_device->uevent_loaded = true; |
| |
| while (fgets(line, sizeof(line), f)) { |
| char *pos; |
| |
| pos = strchr(line, '\n'); |
| if (pos == NULL) |
| continue; |
| pos[0] = '\0'; |
| |
| if (startswith(line, "DEVTYPE=")) { |
| udev_device_set_devtype(udev_device, &line[8]); |
| continue; |
| } |
| if (startswith(line, "IFINDEX=")) { |
| udev_device_set_ifindex(udev_device, strtoull(&line[8], NULL, 10)); |
| continue; |
| } |
| if (startswith(line, "DEVNAME=")) { |
| udev_device_set_devnode(udev_device, &line[8]); |
| continue; |
| } |
| |
| if (startswith(line, "MAJOR=")) |
| maj = strtoull(&line[6], NULL, 10); |
| else if (startswith(line, "MINOR=")) |
| min = strtoull(&line[6], NULL, 10); |
| else if (startswith(line, "DEVMODE=")) |
| udev_device->devnode_mode = strtoul(&line[8], NULL, 8); |
| |
| udev_device_add_property_from_string(udev_device, line); |
| } |
| |
| udev_device->devnum = makedev(maj, min); |
| fclose(f); |
| return 0; |
| } |
| |
| void udev_device_set_info_loaded(struct udev_device *device) |
| { |
| device->info_loaded = true; |
| } |
| |
| struct udev_device *udev_device_new(struct udev *udev) |
| { |
| struct udev_device *udev_device; |
| struct udev_list_entry *list_entry; |
| |
| if (udev == NULL) |
| return NULL; |
| |
| udev_device = new0(struct udev_device, 1); |
| if (udev_device == NULL) |
| return NULL; |
| udev_device->refcount = 1; |
| udev_device->udev = udev; |
| udev_list_init(udev, &udev_device->devlinks_list, true); |
| udev_list_init(udev, &udev_device->properties_list, true); |
| udev_list_init(udev, &udev_device->sysattr_value_list, true); |
| udev_list_init(udev, &udev_device->sysattr_list, false); |
| udev_list_init(udev, &udev_device->tags_list, true); |
| udev_device->watch_handle = -1; |
| /* copy global properties */ |
| udev_list_entry_foreach(list_entry, udev_get_properties_list_entry(udev)) |
| udev_device_add_property(udev_device, |
| udev_list_entry_get_name(list_entry), |
| udev_list_entry_get_value(list_entry)); |
| return udev_device; |
| } |
| |
| /** |
| * udev_device_new_from_syspath: |
| * @udev: udev library context |
| * @syspath: sys device path including sys directory |
| * |
| * Create new udev device, and fill in information from the sys |
| * device and the udev database entry. The syspath is the absolute |
| * path to the device, including the sys mount point. |
| * |
| * The initial refcount is 1, and needs to be decremented to |
| * release the resources of the udev device. |
| * |
| * Returns: a new udev device, or #NULL, if it does not exist |
| **/ |
| _public_ struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *syspath) |
| { |
| const char *subdir; |
| char path[UTIL_PATH_SIZE]; |
| char *pos; |
| struct stat statbuf; |
| struct udev_device *udev_device; |
| |
| if (udev == NULL) |
| return NULL; |
| if (syspath == NULL) |
| return NULL; |
| |
| /* path starts in sys */ |
| if (!startswith(syspath, "/sys")) { |
| udev_dbg(udev, "not in sys :%s\n", syspath); |
| return NULL; |
| } |
| |
| /* path is not a root directory */ |
| subdir = syspath + strlen("/sys"); |
| pos = strrchr(subdir, '/'); |
| if (pos == NULL || pos[1] == '\0' || pos < &subdir[2]) |
| return NULL; |
| |
| /* resolve possible symlink to real path */ |
| strscpy(path, sizeof(path), syspath); |
| util_resolve_sys_link(udev, path, sizeof(path)); |
| |
| if (startswith(path + strlen("/sys"), "/devices/")) { |
| char file[UTIL_PATH_SIZE]; |
| |
| /* all "devices" require a "uevent" file */ |
| strscpyl(file, sizeof(file), path, "/uevent", NULL); |
| if (stat(file, &statbuf) != 0) |
| return NULL; |
| } else { |
| /* everything else just needs to be a directory */ |
| if (stat(path, &statbuf) != 0 || !S_ISDIR(statbuf.st_mode)) |
| return NULL; |
| } |
| |
| udev_device = udev_device_new(udev); |
| if (udev_device == NULL) |
| return NULL; |
| |
| udev_device_set_syspath(udev_device, path); |
| udev_dbg(udev, "device %p has devpath '%s'\n", udev_device, udev_device_get_devpath(udev_device)); |
| |
| return udev_device; |
| } |
| |
| /** |
| * udev_device_new_from_devnum: |
| * @udev: udev library context |
| * @type: char or block device |
| * @devnum: device major/minor number |
| * |
| * Create new udev device, and fill in information from the sys |
| * device and the udev database entry. The device is looked-up |
| * by its major/minor number and type. Character and block device |
| * numbers are not unique across the two types. |
| * |
| * The initial refcount is 1, and needs to be decremented to |
| * release the resources of the udev device. |
| * |
| * Returns: a new udev device, or #NULL, if it does not exist |
| **/ |
| _public_ struct udev_device *udev_device_new_from_devnum(struct udev *udev, char type, dev_t devnum) |
| { |
| char path[UTIL_PATH_SIZE]; |
| const char *type_str; |
| |
| if (type == 'b') |
| type_str = "block"; |
| else if (type == 'c') |
| type_str = "char"; |
| else |
| return NULL; |
| |
| /* use /sys/dev/{block,char}/<maj>:<min> link */ |
| snprintf(path, sizeof(path), "/sys/dev/%s/%u:%u", |
| type_str, major(devnum), minor(devnum)); |
| return udev_device_new_from_syspath(udev, path); |
| } |
| |
| /** |
| * udev_device_new_from_device_id: |
| * @udev: udev library context |
| * @id: text string identifying a kernel device |
| * |
| * Create new udev device, and fill in information from the sys |
| * device and the udev database entry. The device is looked-up |
| * by a special string: |
| * b8:2 - block device major:minor |
| * c128:1 - char device major:minor |
| * n3 - network device ifindex |
| * +sound:card29 - kernel driver core subsystem:device name |
| * |
| * The initial refcount is 1, and needs to be decremented to |
| * release the resources of the udev device. |
| * |
| * Returns: a new udev device, or #NULL, if it does not exist |
| **/ |
| _public_ struct udev_device *udev_device_new_from_device_id(struct udev *udev, const char *id) |
| { |
| char type; |
| int maj, min; |
| char subsys[UTIL_PATH_SIZE]; |
| char *sysname; |
| |
| switch(id[0]) { |
| case 'b': |
| case 'c': |
| if (sscanf(id, "%c%i:%i", &type, &maj, &min) != 3) |
| return NULL; |
| return udev_device_new_from_devnum(udev, type, makedev(maj, min)); |
| case 'n': { |
| int sk; |
| struct ifreq ifr; |
| struct udev_device *dev; |
| int ifindex; |
| |
| ifindex = strtoul(&id[1], NULL, 10); |
| if (ifindex <= 0) |
| return NULL; |
| |
| sk = socket(PF_INET, SOCK_DGRAM, 0); |
| if (sk < 0) |
| return NULL; |
| memzero(&ifr, sizeof(struct ifreq)); |
| ifr.ifr_ifindex = ifindex; |
| if (ioctl(sk, SIOCGIFNAME, &ifr) != 0) { |
| close(sk); |
| return NULL; |
| } |
| close(sk); |
| |
| dev = udev_device_new_from_subsystem_sysname(udev, "net", ifr.ifr_name); |
| if (dev == NULL) |
| return NULL; |
| if (udev_device_get_ifindex(dev) == ifindex) |
| return dev; |
| udev_device_unref(dev); |
| return NULL; |
| } |
| case '+': |
| strscpy(subsys, sizeof(subsys), &id[1]); |
| sysname = strchr(subsys, ':'); |
| if (sysname == NULL) |
| return NULL; |
| sysname[0] = '\0'; |
| sysname = &sysname[1]; |
| return udev_device_new_from_subsystem_sysname(udev, subsys, sysname); |
| default: |
| return NULL; |
| } |
| } |
| |
| /** |
| * udev_device_new_from_subsystem_sysname: |
| * @udev: udev library context |
| * @subsystem: the subsystem of the device |
| * @sysname: the name of the device |
| * |
| * Create new udev device, and fill in information from the sys device |
| * and the udev database entry. The device is looked up by the subsystem |
| * and name string of the device, like "mem" / "zero", or "block" / "sda". |
| * |
| * The initial refcount is 1, and needs to be decremented to |
| * release the resources of the udev device. |
| * |
| * Returns: a new udev device, or #NULL, if it does not exist |
| **/ |
| _public_ struct udev_device *udev_device_new_from_subsystem_sysname(struct udev *udev, const char *subsystem, const char *sysname) |
| { |
| char path[UTIL_PATH_SIZE]; |
| struct stat statbuf; |
| |
| if (streq(subsystem, "subsystem")) { |
| strscpyl(path, sizeof(path), "/sys/subsystem/", sysname, NULL); |
| if (stat(path, &statbuf) == 0) |
| goto found; |
| |
| strscpyl(path, sizeof(path), "/sys/bus/", sysname, NULL); |
| if (stat(path, &statbuf) == 0) |
| goto found; |
| |
| strscpyl(path, sizeof(path), "/sys/class/", sysname, NULL); |
| if (stat(path, &statbuf) == 0) |
| goto found; |
| goto out; |
| } |
| |
| if (streq(subsystem, "module")) { |
| strscpyl(path, sizeof(path), "/sys/module/", sysname, NULL); |
| if (stat(path, &statbuf) == 0) |
| goto found; |
| goto out; |
| } |
| |
| if (streq(subsystem, "drivers")) { |
| char subsys[UTIL_NAME_SIZE]; |
| char *driver; |
| |
| strscpy(subsys, sizeof(subsys), sysname); |
| driver = strchr(subsys, ':'); |
| if (driver != NULL) { |
| driver[0] = '\0'; |
| driver = &driver[1]; |
| |
| strscpyl(path, sizeof(path), "/sys/subsystem/", subsys, "/drivers/", driver, NULL); |
| if (stat(path, &statbuf) == 0) |
| goto found; |
| |
| strscpyl(path, sizeof(path), "/sys/bus/", subsys, "/drivers/", driver, NULL); |
| if (stat(path, &statbuf) == 0) |
| goto found; |
| } |
| goto out; |
| } |
| |
| strscpyl(path, sizeof(path), "/sys/subsystem/", subsystem, "/devices/", sysname, NULL); |
| if (stat(path, &statbuf) == 0) |
| goto found; |
| |
| strscpyl(path, sizeof(path), "/sys/bus/", subsystem, "/devices/", sysname, NULL); |
| if (stat(path, &statbuf) == 0) |
| goto found; |
| |
| strscpyl(path, sizeof(path), "/sys/class/", subsystem, "/", sysname, NULL); |
| if (stat(path, &statbuf) == 0) |
| goto found; |
| out: |
| return NULL; |
| found: |
| return udev_device_new_from_syspath(udev, path); |
| } |
| |
| /** |
| * udev_device_new_from_environment |
| * @udev: udev library context |
| * |
| * Create new udev device, and fill in information from the |
| * current process environment. This only works reliable if |
| * the process is called from a udev rule. It is usually used |
| * for tools executed from IMPORT= rules. |
| * |
| * The initial refcount is 1, and needs to be decremented to |
| * release the resources of the udev device. |
| * |
| * Returns: a new udev device, or #NULL, if it does not exist |
| **/ |
| _public_ struct udev_device *udev_device_new_from_environment(struct udev *udev) |
| { |
| int i; |
| struct udev_device *udev_device; |
| |
| udev_device = udev_device_new(udev); |
| if (udev_device == NULL) |
| return NULL; |
| udev_device_set_info_loaded(udev_device); |
| |
| for (i = 0; environ[i] != NULL; i++) |
| udev_device_add_property_from_string_parse(udev_device, environ[i]); |
| |
| if (udev_device_add_property_from_string_parse_finish(udev_device) < 0) { |
| udev_dbg(udev, "missing values, invalid device\n"); |
| udev_device_unref(udev_device); |
| udev_device = NULL; |
| } |
| |
| return udev_device; |
| } |
| |
| static struct udev_device *device_new_from_parent(struct udev_device *udev_device) |
| { |
| struct udev_device *udev_device_parent = NULL; |
| char path[UTIL_PATH_SIZE]; |
| const char *subdir; |
| |
| strscpy(path, sizeof(path), udev_device->syspath); |
| subdir = path + strlen("/sys/"); |
| for (;;) { |
| char *pos; |
| |
| pos = strrchr(subdir, '/'); |
| if (pos == NULL || pos < &subdir[2]) |
| break; |
| pos[0] = '\0'; |
| udev_device_parent = udev_device_new_from_syspath(udev_device->udev, path); |
| if (udev_device_parent != NULL) |
| return udev_device_parent; |
| } |
| return NULL; |
| } |
| |
| /** |
| * udev_device_get_parent: |
| * @udev_device: the device to start searching from |
| * |
| * Find the next parent device, and fill in information from the sys |
| * device and the udev database entry. |
| * |
| * Returned device is not referenced. It is attached to the child |
| * device, and will be cleaned up when the child device is cleaned up. |
| * |
| * It is not necessarily just the upper level directory, empty or not |
| * recognized sys directories are ignored. |
| * |
| * It can be called as many times as needed, without caring about |
| * references. |
| * |
| * Returns: a new udev device, or #NULL, if it no parent exist. |
| **/ |
| _public_ struct udev_device *udev_device_get_parent(struct udev_device *udev_device) |
| { |
| if (udev_device == NULL) |
| return NULL; |
| if (!udev_device->parent_set) { |
| udev_device->parent_set = true; |
| udev_device->parent_device = device_new_from_parent(udev_device); |
| } |
| return udev_device->parent_device; |
| } |
| |
| /** |
| * udev_device_get_parent_with_subsystem_devtype: |
| * @udev_device: udev device to start searching from |
| * @subsystem: the subsystem of the device |
| * @devtype: the type (DEVTYPE) of the device |
| * |
| * Find the next parent device, with a matching subsystem and devtype |
| * value, and fill in information from the sys device and the udev |
| * database entry. |
| * |
| * If devtype is #NULL, only subsystem is checked, and any devtype will |
| * match. |
| * |
| * Returned device is not referenced. It is attached to the child |
| * device, and will be cleaned up when the child device is cleaned up. |
| * |
| * It can be called as many times as needed, without caring about |
| * references. |
| * |
| * Returns: a new udev device, or #NULL if no matching parent exists. |
| **/ |
| _public_ struct udev_device *udev_device_get_parent_with_subsystem_devtype(struct udev_device *udev_device, const char *subsystem, const char *devtype) |
| { |
| struct udev_device *parent; |
| |
| if (subsystem == NULL) |
| return NULL; |
| |
| parent = udev_device_get_parent(udev_device); |
| while (parent != NULL) { |
| const char *parent_subsystem; |
| const char *parent_devtype; |
| |
| parent_subsystem = udev_device_get_subsystem(parent); |
| if (parent_subsystem != NULL && streq(parent_subsystem, subsystem)) { |
| if (devtype == NULL) |
| break; |
| parent_devtype = udev_device_get_devtype(parent); |
| if (parent_devtype != NULL && streq(parent_devtype, devtype)) |
| break; |
| } |
| parent = udev_device_get_parent(parent); |
| } |
| return parent; |
| } |
| |
| /** |
| * udev_device_get_udev: |
| * @udev_device: udev device |
| * |
| * Retrieve the udev library context the device was created with. |
| * |
| * Returns: the udev library context |
| **/ |
| _public_ struct udev *udev_device_get_udev(struct udev_device *udev_device) |
| { |
| if (udev_device == NULL) |
| return NULL; |
| return udev_device->udev; |
| } |
| |
| /** |
| * udev_device_ref: |
| * @udev_device: udev device |
| * |
| * Take a reference of a udev device. |
| * |
| * Returns: the passed udev device |
| **/ |
| _public_ struct udev_device *udev_device_ref(struct udev_device *udev_device) |
| { |
| if (udev_device == NULL) |
| return NULL; |
| udev_device->refcount++; |
| return udev_device; |
| } |
| |
| /** |
| * udev_device_unref: |
| * @udev_device: udev device |
| * |
| * Drop a reference of a udev device. If the refcount reaches zero, |
| * the resources of the device will be released. |
| * |
| * Returns: #NULL |
| **/ |
| _public_ struct udev_device *udev_device_unref(struct udev_device *udev_device) |
| { |
| if (udev_device == NULL) |
| return NULL; |
| udev_device->refcount--; |
| if (udev_device->refcount > 0) |
| return NULL; |
| if (udev_device->parent_device != NULL) |
| udev_device_unref(udev_device->parent_device); |
| free(udev_device->syspath); |
| free(udev_device->sysname); |
| free(udev_device->devnode); |
| free(udev_device->subsystem); |
| free(udev_device->devtype); |
| udev_list_cleanup(&udev_device->devlinks_list); |
| udev_list_cleanup(&udev_device->properties_list); |
| udev_list_cleanup(&udev_device->sysattr_value_list); |
| udev_list_cleanup(&udev_device->sysattr_list); |
| udev_list_cleanup(&udev_device->tags_list); |
| free(udev_device->action); |
| free(udev_device->driver); |
| free(udev_device->devpath_old); |
| free(udev_device->id_filename); |
| free(udev_device->envp); |
| free(udev_device->monitor_buf); |
| free(udev_device); |
| return NULL; |
| } |
| |
| /** |
| * udev_device_get_devpath: |
| * @udev_device: udev device |
| * |
| * Retrieve the kernel devpath value of the udev device. The path |
| * does not contain the sys mount point, and starts with a '/'. |
| * |
| * Returns: the devpath of the udev device |
| **/ |
| _public_ const char *udev_device_get_devpath(struct udev_device *udev_device) |
| { |
| if (udev_device == NULL) |
| return NULL; |
| return udev_device->devpath; |
| } |
| |
| /** |
| * udev_device_get_syspath: |
| * @udev_device: udev device |
| * |
| * Retrieve the sys path of the udev device. The path is an |
| * absolute path and starts with the sys mount point. |
| * |
| * Returns: the sys path of the udev device |
| **/ |
| _public_ const char *udev_device_get_syspath(struct udev_device *udev_device) |
| { |
| if (udev_device == NULL) |
| return NULL; |
| return udev_device->syspath; |
| } |
| |
| /** |
| * udev_device_get_sysname: |
| * @udev_device: udev device |
| * |
| * Get the kernel device name in /sys. |
| * |
| * Returns: the name string of the device device |
| **/ |
| _public_ const char *udev_device_get_sysname(struct udev_device *udev_device) |
| { |
| if (udev_device == NULL) |
| return NULL; |
| return udev_device->sysname; |
| } |
| |
| /** |
| * udev_device_get_sysnum: |
| * @udev_device: udev device |
| * |
| * Get the instance number of the device. |
| * |
| * Returns: the trailing number string of the device name |
| **/ |
| _public_ const char *udev_device_get_sysnum(struct udev_device *udev_device) |
| { |
| if (udev_device == NULL) |
| return NULL; |
| return udev_device->sysnum; |
| } |
| |
| /** |
| * udev_device_get_devnode: |
| * @udev_device: udev device |
| * |
| * Retrieve the device node file name belonging to the udev device. |
| * The path is an absolute path, and starts with the device directory. |
| * |
| * Returns: the device node file name of the udev device, or #NULL if no device node exists |
| **/ |
| _public_ const char *udev_device_get_devnode(struct udev_device *udev_device) |
| { |
| if (udev_device == NULL) |
| return NULL; |
| if (udev_device->devnode != NULL) |
| return udev_device->devnode; |
| if (!udev_device->info_loaded) |
| udev_device_read_uevent_file(udev_device); |
| return udev_device->devnode; |
| } |
| |
| /** |
| * udev_device_get_devlinks_list_entry: |
| * @udev_device: udev device |
| * |
| * Retrieve the list of device links pointing to the device file of |
| * the udev device. The next list entry can be retrieved with |
| * udev_list_entry_get_next(), which returns #NULL if no more entries exist. |
| * The devlink path can be retrieved from the list entry by |
| * udev_list_entry_get_name(). The path is an absolute path, and starts with |
| * the device directory. |
| * |
| * Returns: the first entry of the device node link list |
| **/ |
| _public_ struct udev_list_entry *udev_device_get_devlinks_list_entry(struct udev_device *udev_device) |
| { |
| if (udev_device == NULL) |
| return NULL; |
| if (!udev_device->info_loaded) |
| udev_device_read_db(udev_device, NULL); |
| return udev_list_get_entry(&udev_device->devlinks_list); |
| } |
| |
| void udev_device_cleanup_devlinks_list(struct udev_device *udev_device) |
| { |
| udev_device->devlinks_uptodate = false; |
| udev_list_cleanup(&udev_device->devlinks_list); |
| } |
| |
| /** |
| * udev_device_get_properties_list_entry: |
| * @udev_device: udev device |
| * |
| * Retrieve the list of key/value device properties of the udev |
| * device. The next list entry can be retrieved with udev_list_entry_get_next(), |
| * which returns #NULL if no more entries exist. The property name |
| * can be retrieved from the list entry by udev_list_entry_get_name(), |
| * the property value by udev_list_entry_get_value(). |
| * |
| * Returns: the first entry of the property list |
| **/ |
| _public_ struct udev_list_entry *udev_device_get_properties_list_entry(struct udev_device *udev_device) |
| { |
| if (udev_device == NULL) |
| return NULL; |
| if (!udev_device->info_loaded) { |
| udev_device_read_uevent_file(udev_device); |
| udev_device_read_db(udev_device, NULL); |
| } |
| if (!udev_device->devlinks_uptodate) { |
| char symlinks[UTIL_PATH_SIZE]; |
| struct udev_list_entry *list_entry; |
| |
| udev_device->devlinks_uptodate = true; |
| list_entry = udev_device_get_devlinks_list_entry(udev_device); |
| if (list_entry != NULL) { |
| char *s; |
| size_t l; |
| |
| s = symlinks; |
| l = strpcpyl(&s, sizeof(symlinks), udev_list_entry_get_name(list_entry), NULL); |
| udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry)) |
| l = strpcpyl(&s, l, " ", udev_list_entry_get_name(list_entry), NULL); |
| udev_device_add_property(udev_device, "DEVLINKS", symlinks); |
| } |
| } |
| if (!udev_device->tags_uptodate) { |
| udev_device->tags_uptodate = true; |
| if (udev_device_get_tags_list_entry(udev_device) != NULL) { |
| char tags[UTIL_PATH_SIZE]; |
| struct udev_list_entry *list_entry; |
| char *s; |
| size_t l; |
| |
| s = tags; |
| l = strpcpyl(&s, sizeof(tags), ":", NULL); |
| udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(udev_device)) |
| l = strpcpyl(&s, l, udev_list_entry_get_name(list_entry), ":", NULL); |
| udev_device_add_property(udev_device, "TAGS", tags); |
| } |
| } |
| return udev_list_get_entry(&udev_device->properties_list); |
| } |
| |
| /** |
| * udev_device_get_action: |
| * @udev_device: udev device |
| * |
| * This is only valid if the device was received through a monitor. Devices read from |
| * sys do not have an action string. Usual actions are: add, remove, change, online, |
| * offline. |
| * |
| * Returns: the kernel action value, or #NULL if there is no action value available. |
| **/ |
| _public_ const char *udev_device_get_action(struct udev_device *udev_device) |
| { |
| if (udev_device == NULL) |
| return NULL; |
| return udev_device->action; |
| } |
| |
| /** |
| * udev_device_get_usec_since_initialized: |
| * @udev_device: udev device |
| * |
| * Return the number of microseconds passed since udev set up the |
| * device for the first time. |
| * |
| * This is only implemented for devices with need to store properties |
| * in the udev database. All other devices return 0 here. |
| * |
| * Returns: the number of microseconds since the device was first seen. |
| **/ |
| _public_ unsigned long long int udev_device_get_usec_since_initialized(struct udev_device *udev_device) |
| { |
| usec_t now_ts; |
| |
| if (udev_device == NULL) |
| return 0; |
| if (!udev_device->info_loaded) |
| udev_device_read_db(udev_device, NULL); |
| if (udev_device->usec_initialized == 0) |
| return 0; |
| now_ts = now(CLOCK_MONOTONIC); |
| if (now_ts == 0) |
| return 0; |
| return now_ts - udev_device->usec_initialized; |
| } |
| |
| usec_t udev_device_get_usec_initialized(struct udev_device *udev_device) |
| { |
| return udev_device->usec_initialized; |
| } |
| |
| void udev_device_set_usec_initialized(struct udev_device *udev_device, usec_t usec_initialized) |
| { |
| char num[32]; |
| |
| udev_device->usec_initialized = usec_initialized; |
| snprintf(num, sizeof(num), "%llu", (unsigned long long)usec_initialized); |
| udev_device_add_property(udev_device, "USEC_INITIALIZED", num); |
| } |
| |
| /** |
| * udev_device_get_sysattr_value: |
| * @udev_device: udev device |
| * @sysattr: attribute name |
| * |
| * The retrieved value is cached in the device. Repeated calls will return the same |
| * value and not open the attribute again. |
| * |
| * Returns: the content of a sys attribute file, or #NULL if there is no sys attribute value. |
| **/ |
| _public_ const char *udev_device_get_sysattr_value(struct udev_device *udev_device, const char *sysattr) |
| { |
| struct udev_list_entry *list_entry; |
| char path[UTIL_PATH_SIZE]; |
| char value[4096]; |
| struct stat statbuf; |
| int fd; |
| ssize_t size; |
| const char *val = NULL; |
| |
| if (udev_device == NULL) |
| return NULL; |
| if (sysattr == NULL) |
| return NULL; |
| |
| /* look for possibly already cached result */ |
| list_entry = udev_list_get_entry(&udev_device->sysattr_value_list); |
| list_entry = udev_list_entry_get_by_name(list_entry, sysattr); |
| if (list_entry != NULL) |
| return udev_list_entry_get_value(list_entry); |
| |
| strscpyl(path, sizeof(path), udev_device_get_syspath(udev_device), "/", sysattr, NULL); |
| if (lstat(path, &statbuf) != 0) { |
| udev_list_entry_add(&udev_device->sysattr_value_list, sysattr, NULL); |
| goto out; |
| } |
| |
| if (S_ISLNK(statbuf.st_mode)) { |
| /* |
| * Some core links return only the last element of the target path, |
| * these are just values, the paths should not be exposed. |
| */ |
| if (streq(sysattr, "driver") || |
| streq(sysattr, "subsystem") || |
| streq(sysattr, "module")) { |
| if (util_get_sys_core_link_value(udev_device->udev, sysattr, |
| udev_device->syspath, value, sizeof(value)) < 0) |
| return NULL; |
| list_entry = udev_list_entry_add(&udev_device->sysattr_value_list, sysattr, value); |
| val = udev_list_entry_get_value(list_entry); |
| goto out; |
| } |
| |
| goto out; |
| } |
| |
| /* skip directories */ |
| if (S_ISDIR(statbuf.st_mode)) |
| goto out; |
| |
| /* skip non-readable files */ |
| if ((statbuf.st_mode & S_IRUSR) == 0) |
| goto out; |
| |
| /* read attribute value */ |
| fd = open(path, O_RDONLY|O_CLOEXEC); |
| if (fd < 0) |
| goto out; |
| size = read(fd, value, sizeof(value)); |
| close(fd); |
| if (size < 0) |
| goto out; |
| if (size == sizeof(value)) |
| goto out; |
| |
| /* got a valid value, store it in cache and return it */ |
| value[size] = '\0'; |
| util_remove_trailing_chars(value, '\n'); |
| list_entry = udev_list_entry_add(&udev_device->sysattr_value_list, sysattr, value); |
| val = udev_list_entry_get_value(list_entry); |
| out: |
| return val; |
| } |
| |
| /** |
| * udev_device_set_sysattr_value: |
| * @udev_device: udev device |
| * @sysattr: attribute name |
| * @value: new value to be set |
| * |
| * Update the contents of the sys attribute and the cached value of the device. |
| * |
| * Returns: Negative error code on failure or 0 on success. |
| **/ |
| _public_ int udev_device_set_sysattr_value(struct udev_device *udev_device, const char *sysattr, char *value) |
| { |
| struct udev_device *dev; |
| char path[UTIL_PATH_SIZE]; |
| struct stat statbuf; |
| int fd; |
| ssize_t size, value_len; |
| int ret = 0; |
| |
| if (udev_device == NULL) |
| return -EINVAL; |
| dev = udev_device; |
| if (sysattr == NULL) |
| return -EINVAL; |
| if (value == NULL) |
| value_len = 0; |
| else |
| value_len = strlen(value); |
| |
| strscpyl(path, sizeof(path), udev_device_get_syspath(dev), "/", sysattr, NULL); |
| if (lstat(path, &statbuf) != 0) { |
| udev_list_entry_add(&dev->sysattr_value_list, sysattr, NULL); |
| ret = -ENXIO; |
| goto out; |
| } |
| |
| if (S_ISLNK(statbuf.st_mode)) { |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| /* skip directories */ |
| if (S_ISDIR(statbuf.st_mode)) { |
| ret = -EISDIR; |
| goto out; |
| } |
| |
| /* skip non-readable files */ |
| if ((statbuf.st_mode & S_IRUSR) == 0) { |
| ret = -EACCES; |
| goto out; |
| } |
| |
| /* Value is limited to 4k */ |
| if (value_len > 4096) { |
| ret = -EINVAL; |
| goto out; |
| } |
| util_remove_trailing_chars(value, '\n'); |
| |
| /* write attribute value */ |
| fd = open(path, O_WRONLY|O_CLOEXEC); |
| if (fd < 0) { |
| ret = -errno; |
| goto out; |
| } |
| size = write(fd, value, value_len); |
| close(fd); |
| if (size < 0) { |
| ret = -errno; |
| goto out; |
| } |
| if (size < value_len) { |
| ret = -EIO; |
| goto out; |
| } |
| |
| /* wrote a valid value, store it in cache and return it */ |
| udev_list_entry_add(&dev->sysattr_value_list, sysattr, value); |
| out: |
| if (dev != udev_device) |
| udev_device_unref(dev); |
| return ret; |
| } |
| |
| static int udev_device_sysattr_list_read(struct udev_device *udev_device) |
| { |
| struct dirent *dent; |
| DIR *dir; |
| int num = 0; |
| |
| if (udev_device == NULL) |
| return -EINVAL; |
| if (udev_device->sysattr_list_read) |
| return 0; |
| |
| dir = opendir(udev_device_get_syspath(udev_device)); |
| if (!dir) |
| return -errno; |
| |
| for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) { |
| char path[UTIL_PATH_SIZE]; |
| struct stat statbuf; |
| |
| /* only handle symlinks and regular files */ |
| if (dent->d_type != DT_LNK && dent->d_type != DT_REG) |
| continue; |
| |
| strscpyl(path, sizeof(path), udev_device_get_syspath(udev_device), "/", dent->d_name, NULL); |
| if (lstat(path, &statbuf) != 0) |
| continue; |
| if ((statbuf.st_mode & S_IRUSR) == 0) |
| continue; |
| |
| udev_list_entry_add(&udev_device->sysattr_list, dent->d_name, NULL); |
| num++; |
| } |
| |
| closedir(dir); |
| udev_device->sysattr_list_read = true; |
| |
| return num; |
| } |
| |
| /** |
| * udev_device_get_sysattr_list_entry: |
| * @udev_device: udev device |
| * |
| * Retrieve the list of available sysattrs, with value being empty; |
| * This just return all available sysfs attributes for a particular |
| * device without reading their values. |
| * |
| * Returns: the first entry of the property list |
| **/ |
| _public_ struct udev_list_entry *udev_device_get_sysattr_list_entry(struct udev_device *udev_device) |
| { |
| if (!udev_device->sysattr_list_read) { |
| int ret; |
| ret = udev_device_sysattr_list_read(udev_device); |
| if (0 > ret) |
| return NULL; |
| } |
| |
| return udev_list_get_entry(&udev_device->sysattr_list); |
| } |
| |
| int udev_device_set_syspath(struct udev_device *udev_device, const char *syspath) |
| { |
| const char *pos; |
| size_t len; |
| |
| free(udev_device->syspath); |
| udev_device->syspath = strdup(syspath); |
| if (udev_device->syspath == NULL) |
| return -ENOMEM; |
| udev_device->devpath = udev_device->syspath + strlen("/sys"); |
| udev_device_add_property(udev_device, "DEVPATH", udev_device->devpath); |
| |
| pos = strrchr(udev_device->syspath, '/'); |
| if (pos == NULL) |
| return -EINVAL; |
| udev_device->sysname = strdup(&pos[1]); |
| if (udev_device->sysname == NULL) |
| return -ENOMEM; |
| |
| /* some devices have '!' in their name, change that to '/' */ |
| len = 0; |
| while (udev_device->sysname[len] != '\0') { |
| if (udev_device->sysname[len] == '!') |
| udev_device->sysname[len] = '/'; |
| len++; |
| } |
| |
| /* trailing number */ |
| while (len > 0 && isdigit(udev_device->sysname[--len])) |
| udev_device->sysnum = &udev_device->sysname[len]; |
| |
| /* sysname is completely numeric */ |
| if (len == 0) |
| udev_device->sysnum = NULL; |
| |
| return 0; |
| } |
| |
| static int udev_device_set_devnode(struct udev_device *udev_device, const char *devnode) |
| { |
| free(udev_device->devnode); |
| if (devnode[0] != '/') { |
| if (asprintf(&udev_device->devnode, "/dev/%s", devnode) < 0) |
| udev_device->devnode = NULL; |
| } else { |
| udev_device->devnode = strdup(devnode); |
| } |
| if (udev_device->devnode == NULL) |
| return -ENOMEM; |
| udev_device_add_property(udev_device, "DEVNAME", udev_device->devnode); |
| return 0; |
| } |
| |
| int udev_device_add_devlink(struct udev_device *udev_device, const char *devlink) |
| { |
| struct udev_list_entry *list_entry; |
| |
| udev_device->devlinks_uptodate = false; |
| list_entry = udev_list_entry_add(&udev_device->devlinks_list, devlink, NULL); |
| if (list_entry == NULL) |
| return -ENOMEM; |
| return 0; |
| } |
| |
| const char *udev_device_get_id_filename(struct udev_device *udev_device) |
| { |
| if (udev_device->id_filename == NULL) { |
| if (udev_device_get_subsystem(udev_device) == NULL) |
| return NULL; |
| |
| if (major(udev_device_get_devnum(udev_device)) > 0) { |
| /* use dev_t -- b259:131072, c254:0 */ |
| if (asprintf(&udev_device->id_filename, "%c%u:%u", |
| streq(udev_device_get_subsystem(udev_device), "block") ? 'b' : 'c', |
| major(udev_device_get_devnum(udev_device)), |
| minor(udev_device_get_devnum(udev_device))) < 0) |
| udev_device->id_filename = NULL; |
| } else if (udev_device_get_ifindex(udev_device) > 0) { |
| /* use netdev ifindex -- n3 */ |
| if (asprintf(&udev_device->id_filename, "n%u", udev_device_get_ifindex(udev_device)) < 0) |
| udev_device->id_filename = NULL; |
| } else { |
| /* |
| * use $subsys:$syname -- pci:0000:00:1f.2 |
| * sysname() has '!' translated, get it from devpath |
| */ |
| const char *sysname; |
| sysname = strrchr(udev_device->devpath, '/'); |
| if (sysname == NULL) |
| return NULL; |
| sysname = &sysname[1]; |
| if (asprintf(&udev_device->id_filename, "+%s:%s", udev_device_get_subsystem(udev_device), sysname) < 0) |
| udev_device->id_filename = NULL; |
| } |
| } |
| return udev_device->id_filename; |
| } |
| |
| /** |
| * udev_device_get_is_initialized: |
| * @udev_device: udev device |
| * |
| * Check if udev has already handled the device and has set up |
| * device node permissions and context, or has renamed a network |
| * device. |
| * |
| * This is only implemented for devices with a device node |
| * or network interfaces. All other devices return 1 here. |
| * |
| * Returns: 1 if the device is set up. 0 otherwise. |
| **/ |
| _public_ int udev_device_get_is_initialized(struct udev_device *udev_device) |
| { |
| if (!udev_device->info_loaded) |
| udev_device_read_db(udev_device, NULL); |
| return udev_device->is_initialized; |
| } |
| |
| void udev_device_set_is_initialized(struct udev_device *udev_device) |
| { |
| udev_device->is_initialized = true; |
| } |
| |
| int udev_device_add_tag(struct udev_device *udev_device, const char *tag) |
| { |
| if (strchr(tag, ':') != NULL || strchr(tag, ' ') != NULL) |
| return -EINVAL; |
| udev_device->tags_uptodate = false; |
| if (udev_list_entry_add(&udev_device->tags_list, tag, NULL) != NULL) |
| return 0; |
| return -ENOMEM; |
| } |
| |
| void udev_device_cleanup_tags_list(struct udev_device *udev_device) |
| { |
| udev_device->tags_uptodate = false; |
| udev_list_cleanup(&udev_device->tags_list); |
| } |
| |
| /** |
| * udev_device_get_tags_list_entry: |
| * @udev_device: udev device |
| * |
| * Retrieve the list of tags attached to the udev device. The next |
| * list entry can be retrieved with udev_list_entry_get_next(), |
| * which returns #NULL if no more entries exist. The tag string |
| * can be retrieved from the list entry by udev_list_entry_get_name(). |
| * |
| * Returns: the first entry of the tag list |
| **/ |
| _public_ struct udev_list_entry *udev_device_get_tags_list_entry(struct udev_device *udev_device) |
| { |
| if (udev_device == NULL) |
| return NULL; |
| if (!udev_device->info_loaded) |
| udev_device_read_db(udev_device, NULL); |
| return udev_list_get_entry(&udev_device->tags_list); |
| } |
| |
| /** |
| * udev_device_has_tag: |
| * @udev_device: udev device |
| * @tag: tag name |
| * |
| * Check if a given device has a certain tag associated. |
| * |
| * Returns: 1 if the tag is found. 0 otherwise. |
| **/ |
| _public_ int udev_device_has_tag(struct udev_device *udev_device, const char *tag) |
| { |
| struct udev_list_entry *list_entry; |
| |
| if (udev_device == NULL) |
| return false; |
| if (!udev_device->info_loaded) |
| udev_device_read_db(udev_device, NULL); |
| list_entry = udev_device_get_tags_list_entry(udev_device); |
| if (udev_list_entry_get_by_name(list_entry, tag) != NULL) |
| return true; |
| return false; |
| } |
| |
| #define ENVP_SIZE 128 |
| #define MONITOR_BUF_SIZE 4096 |
| static int update_envp_monitor_buf(struct udev_device *udev_device) |
| { |
| struct udev_list_entry *list_entry; |
| char *s; |
| size_t l; |
| unsigned int i; |
| |
| /* monitor buffer of property strings */ |
| free(udev_device->monitor_buf); |
| udev_device->monitor_buf_len = 0; |
| udev_device->monitor_buf = malloc(MONITOR_BUF_SIZE); |
| if (udev_device->monitor_buf == NULL) |
| return -ENOMEM; |
| |
| /* envp array, strings will point into monitor buffer */ |
| if (udev_device->envp == NULL) |
| udev_device->envp = malloc(sizeof(char *) * ENVP_SIZE); |
| if (udev_device->envp == NULL) |
| return -ENOMEM; |
| |
| i = 0; |
| s = udev_device->monitor_buf; |
| l = MONITOR_BUF_SIZE; |
| udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device)) { |
| const char *key; |
| |
| key = udev_list_entry_get_name(list_entry); |
| /* skip private variables */ |
| if (key[0] == '.') |
| continue; |
| |
| /* add string to envp array */ |
| udev_device->envp[i++] = s; |
| if (i+1 >= ENVP_SIZE) |
| return -EINVAL; |
| |
| /* add property string to monitor buffer */ |
| l = strpcpyl(&s, l, key, "=", udev_list_entry_get_value(list_entry), NULL); |
| if (l == 0) |
| return -EINVAL; |
| /* advance past the trailing '\0' that strpcpyl() guarantees */ |
| s++; |
| l--; |
| } |
| udev_device->envp[i] = NULL; |
| udev_device->monitor_buf_len = s - udev_device->monitor_buf; |
| udev_device->envp_uptodate = true; |
| return 0; |
| } |
| |
| char **udev_device_get_properties_envp(struct udev_device *udev_device) |
| { |
| if (!udev_device->envp_uptodate) |
| if (update_envp_monitor_buf(udev_device) != 0) |
| return NULL; |
| return udev_device->envp; |
| } |
| |
| ssize_t udev_device_get_properties_monitor_buf(struct udev_device *udev_device, const char **buf) |
| { |
| if (!udev_device->envp_uptodate) |
| if (update_envp_monitor_buf(udev_device) != 0) |
| return -EINVAL; |
| *buf = udev_device->monitor_buf; |
| return udev_device->monitor_buf_len; |
| } |
| |
| int udev_device_set_action(struct udev_device *udev_device, const char *action) |
| { |
| free(udev_device->action); |
| udev_device->action = strdup(action); |
| if (udev_device->action == NULL) |
| return -ENOMEM; |
| udev_device_add_property(udev_device, "ACTION", udev_device->action); |
| return 0; |
| } |
| |
| int udev_device_get_devlink_priority(struct udev_device *udev_device) |
| { |
| if (!udev_device->info_loaded) |
| udev_device_read_db(udev_device, NULL); |
| return udev_device->devlink_priority; |
| } |
| |
| int udev_device_set_devlink_priority(struct udev_device *udev_device, int prio) |
| { |
| udev_device->devlink_priority = prio; |
| return 0; |
| } |
| |
| int udev_device_get_watch_handle(struct udev_device *udev_device) |
| { |
| if (!udev_device->info_loaded) |
| udev_device_read_db(udev_device, NULL); |
| return udev_device->watch_handle; |
| } |
| |
| int udev_device_set_watch_handle(struct udev_device *udev_device, int handle) |
| { |
| udev_device->watch_handle = handle; |
| return 0; |
| } |
| |
| bool udev_device_get_db_persist(struct udev_device *udev_device) |
| { |
| return udev_device->db_persist; |
| } |
| |
| void udev_device_set_db_persist(struct udev_device *udev_device) |
| { |
| udev_device->db_persist = true; |
| } |