diff options
Diffstat (limited to 'libudev/libudev-device.c')
| -rw-r--r-- | libudev/libudev-device.c | 1249 |
1 files changed, 1249 insertions, 0 deletions
diff --git a/libudev/libudev-device.c b/libudev/libudev-device.c new file mode 100644 index 0000000000..ea54badde4 --- /dev/null +++ b/libudev/libudev-device.c @@ -0,0 +1,1249 @@ +/* + * libudev - interface to udev device information + * + * Copyright (C) 2008-2009 Kay Sievers <kay.sievers@vrfy.org> + * + * This library 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. + */ + +#include <stdio.h> +#include <stdlib.h> +#include <stddef.h> +#include <unistd.h> +#include <errno.h> +#include <string.h> +#include <dirent.h> +#include <fcntl.h> +#include <ctype.h> +#include <sys/stat.h> + +#include "libudev.h" +#include "libudev-private.h" + +struct udev_device { + struct udev *udev; + struct udev_device *parent_device; + char *syspath; + const char *devpath; + char *sysname; + const char *sysnum; + char *devnode; + char *subsystem; + char *devtype; + char *driver; + char *action; + char *devpath_old; + char *knodename; + char **envp; + char *monitor_buf; + size_t monitor_buf_len; + struct udev_list_node devlinks_list; + struct udev_list_node properties_list; + struct udev_list_node sysattr_list; + unsigned long long int seqnum; + int event_timeout; + int timeout; + int num_fake_partitions; + int devlink_priority; + int refcount; + dev_t devnum; + int watch_handle; + unsigned int parent_set:1; + unsigned int subsystem_set:1; + unsigned int devtype_set:1; + unsigned int devlinks_uptodate:1; + unsigned int envp_uptodate:1; + unsigned int driver_set:1; + unsigned int info_loaded:1; + unsigned int ignore_remove:1; +}; + +static size_t devpath_to_db_path(struct udev *udev, const char *devpath, char *filename, size_t len) +{ + char *s; + size_t l; + + s = filename; + l = util_strpcpyl(&s, len, udev_get_dev_path(udev), "/.udev/db/", NULL); + return util_path_encode(devpath, s, l); +} + +int udev_device_read_db(struct udev_device *udev_device) +{ + struct stat stats; + char filename[UTIL_PATH_SIZE]; + char line[UTIL_LINE_SIZE]; + FILE *f; + + devpath_to_db_path(udev_device->udev, udev_device->devpath, filename, sizeof(filename)); + + if (lstat(filename, &stats) != 0) { + dbg(udev_device->udev, "no db file to read %s: %m\n", filename); + return -1; + } + if ((stats.st_mode & S_IFMT) == S_IFLNK) { + char target[UTIL_PATH_SIZE]; + char devnode[UTIL_PATH_SIZE]; + int target_len; + char *next; + + target_len = readlink(filename, target, sizeof(target)); + if (target_len > 0) + target[target_len] = '\0'; + else { + dbg(udev_device->udev, "error reading db link %s: %m\n", filename); + return -1; + } + + next = strchr(target, ' '); + if (next != NULL) { + next[0] = '\0'; + next = &next[1]; + } + util_strscpyl(devnode, sizeof(devnode), udev_get_dev_path(udev_device->udev), "/", target, NULL); + udev_device_set_devnode(udev_device, devnode); + while (next != NULL) { + char devlink[UTIL_PATH_SIZE]; + const char *lnk; + + lnk = next; + next = strchr(next, ' '); + if (next != NULL) { + next[0] = '\0'; + next = &next[1]; + } + util_strscpyl(devlink, sizeof(devlink), udev_get_dev_path(udev_device->udev), "/", lnk, NULL); + udev_device_add_devlink(udev_device, devlink); + } + info(udev_device->udev, "device %p filled with db symlink data '%s'\n", udev_device, udev_device->devnode); + return 0; + } + + f = fopen(filename, "r"); + if (f == NULL) { + dbg(udev_device->udev, "error reading db file %s: %m\n", filename); + return -1; + } + while (fgets(line, sizeof(line), f)) { + ssize_t len; + const char *val; + + len = strlen(line); + if (len < 4) + break; + line[len-1] = '\0'; + val = &line[2]; + switch(line[0]) { + case 'N': + util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev_device->udev), "/", val, NULL); + udev_device_set_devnode(udev_device, filename); + break; + case 'S': + util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev_device->udev), "/", val, NULL); + udev_device_add_devlink(udev_device, filename); + break; + case 'L': + udev_device_set_devlink_priority(udev_device, atoi(val)); + break; + case 'T': + udev_device_set_event_timeout(udev_device, atoi(val)); + break; + case 'A': + udev_device_set_num_fake_partitions(udev_device, atoi(val)); + break; + case 'R': + udev_device_set_ignore_remove(udev_device, atoi(val)); + break; + case 'E': + udev_device_add_property_from_string(udev_device, val); + break; + case 'W': + udev_device_set_watch_handle(udev_device, atoi(val)); + break; + } + } + fclose(f); + + info(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; + + util_strscpyl(filename, sizeof(filename), udev_device->syspath, "/uevent", NULL); + f = fopen(filename, "r"); + if (f == NULL) + return -1; + + while (fgets(line, sizeof(line), f)) { + char *pos; + + pos = strchr(line, '\n'); + if (pos == NULL) + continue; + pos[0] = '\0'; + + if (strncmp(line, "DEVTYPE=", 8) == 0) + udev_device_set_devtype(udev_device, &line[8]); + else if (strncmp(line, "MAJOR=", 6) == 0) + maj = strtoull(&line[6], NULL, 10); + else if (strncmp(line, "MINOR=", 6) == 0) + min = strtoull(&line[6], NULL, 10); + else if (strncmp(line, "DEVNAME=", 8) == 0) + udev_device_set_knodename(udev_device, &line[8]); + + udev_device_add_property_from_string(udev_device, line); + } + + udev_device->devnum = makedev(maj, min); + + fclose(f); + return 0; +} + +static void device_load_info(struct udev_device *device) +{ + device->info_loaded = 1; + udev_device_read_uevent_file(device); + udev_device_read_db(device); +} + +void udev_device_set_info_loaded(struct udev_device *device) +{ + device->info_loaded = 1; +} + +struct udev_device *device_new(struct udev *udev) +{ + struct udev_device *udev_device; + struct udev_list_entry *list_entry; + + if (udev == NULL) + return NULL; + + udev_device = calloc(1, sizeof(struct udev_device)); + if (udev_device == NULL) + return NULL; + udev_device->refcount = 1; + udev_device->udev = udev; + udev_list_init(&udev_device->devlinks_list); + udev_list_init(&udev_device->properties_list); + udev_list_init(&udev_device->sysattr_list); + udev_device->event_timeout = -1; + 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)); + dbg(udev_device->udev, "udev_device: %p created\n", udev_device); + 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 sypath 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 + **/ +struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *syspath) +{ + size_t len; + 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 */ + len = strlen(udev_get_sys_path(udev)); + if (strncmp(syspath, udev_get_sys_path(udev), len) != 0) { + info(udev, "not in sys :%s\n", syspath); + return NULL; + } + + /* path is not a root directory */ + subdir = &syspath[len+1]; + pos = strrchr(subdir, '/'); + if (pos == NULL || pos[1] == '\0' || pos < &subdir[2]) { + dbg(udev, "not a subdir :%s\n", syspath); + return NULL; + } + + /* resolve possible symlink to real path */ + util_strscpy(path, sizeof(path), syspath); + util_resolve_sys_link(udev, path, sizeof(path)); + + /* try to resolve the silly block layout if needed */ + if (strncmp(&path[len], "/block/", 7) == 0) { + char block[UTIL_PATH_SIZE]; + char part[UTIL_PATH_SIZE]; + + util_strscpy(block, sizeof(block), path); + pos = strrchr(block, '/'); + if (pos == NULL) + return NULL; + util_strscpy(part, sizeof(part), pos); + pos[0] = '\0'; + if (util_resolve_sys_link(udev, block, sizeof(block)) == 0) + util_strscpyl(path, sizeof(path), block, part, NULL); + } + + /* path exists in sys */ + if (strncmp(&syspath[len], "/devices/", 9) == 0 || + strncmp(&syspath[len], "/class/", 7) == 0 || + strncmp(&syspath[len], "/block/", 7) == 0) { + char file[UTIL_PATH_SIZE]; + + /* all "devices" require a "uevent" file */ + util_strscpyl(file, sizeof(file), path, "/uevent", NULL); + if (stat(file, &statbuf) != 0) { + dbg(udev, "not a device: %s\n", syspath); + return NULL; + } + } else { + /* everything else just needs to be a directory */ + if (stat(path, &statbuf) != 0 || !S_ISDIR(statbuf.st_mode)) { + dbg(udev, "directory not found: %s\n", syspath); + return NULL; + } + } + + udev_device = device_new(udev); + if (udev_device == NULL) + return NULL; + + udev_device_set_syspath(udev_device, path); + info(udev, "device %p has devpath '%s'\n", udev_device, udev_device_get_devpath(udev_device)); + + return udev_device; +} + +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; + struct udev_enumerate *udev_enumerate; + struct udev_list_entry *list_entry; + struct udev_device *device = NULL; + + if (type == 'b') + type_str = "block"; + else if (type == 'c') + type_str = "char"; + else + return NULL; + + /* /sys/dev/{block,char}/<maj>:<min> link */ + snprintf(path, sizeof(path), "%s/dev/%s/%u:%u", udev_get_sys_path(udev), + type_str, major(devnum), minor(devnum)); + if (util_resolve_sys_link(udev, path, sizeof(path)) == 0) + return udev_device_new_from_syspath(udev, path); + + udev_enumerate = udev_enumerate_new(udev); + if (udev_enumerate == NULL) + return NULL; + + /* fallback to search sys devices for the major/minor */ + if (type == 'b') + udev_enumerate_add_match_subsystem(udev_enumerate, "block"); + else if (type == 'c') + udev_enumerate_add_nomatch_subsystem(udev_enumerate, "block"); + udev_enumerate_scan_devices(udev_enumerate); + udev_list_entry_foreach(list_entry, udev_enumerate_get_list_entry(udev_enumerate)) { + struct udev_device *device_loop; + + device_loop = udev_device_new_from_syspath(udev, udev_list_entry_get_name(list_entry)); + if (device_loop != NULL) { + if (udev_device_get_devnum(device_loop) == devnum) { + if (type == 'b' && strcmp(udev_device_get_subsystem(device_loop), "block") != 0) + continue; + if (type == 'c' && strcmp(udev_device_get_subsystem(device_loop), "block") == 0) + continue; + device = device_loop; + break; + } + udev_device_unref(device_loop); + } + } + udev_enumerate_unref(udev_enumerate); + return device; +} + +struct udev_device *udev_device_new_from_subsystem_sysname(struct udev *udev, const char *subsystem, const char *sysname) +{ + char path_full[UTIL_PATH_SIZE]; + char *path; + size_t l; + struct stat statbuf; + + path = path_full; + l = util_strpcpyl(&path, sizeof(path_full), udev_get_sys_path(udev), NULL); + + if (strcmp(subsystem, "subsystem") == 0) { + util_strscpyl(path, l, "/subsystem/", sysname, NULL); + if (stat(path_full, &statbuf) == 0) + goto found; + + util_strscpyl(path, l, "/bus/", sysname, NULL); + if (stat(path_full, &statbuf) == 0) + goto found; + + util_strscpyl(path, l, "/class/", sysname, NULL); + if (stat(path_full, &statbuf) == 0) + goto found; + goto out; + } + + if (strcmp(subsystem, "module") == 0) { + util_strscpyl(path, l, "/module/", sysname, NULL); + if (stat(path_full, &statbuf) == 0) + goto found; + goto out; + } + + if (strcmp(subsystem, "drivers") == 0) { + char subsys[UTIL_NAME_SIZE]; + char *driver; + + util_strscpy(subsys, sizeof(subsys), sysname); + driver = strchr(subsys, ':'); + if (driver != NULL) { + driver[0] = '\0'; + driver = &driver[1]; + + util_strscpyl(path, l, "/subsystem/", subsys, "/drivers/", driver, NULL); + if (stat(path_full, &statbuf) == 0) + goto found; + + util_strscpyl(path, l, "/bus/", subsys, "/drivers/", driver, NULL); + if (stat(path_full, &statbuf) == 0) + goto found; + } + goto out; + } + + util_strscpyl(path, l, "/subsystem/", subsystem, "/devices/", sysname, NULL); + if (stat(path_full, &statbuf) == 0) + goto found; + + util_strscpyl(path, l, "/bus/", subsystem, "/devices/", sysname, NULL); + if (stat(path_full, &statbuf) == 0) + goto found; + + util_strscpyl(path, l, "/class/", subsystem, "/", sysname, NULL); + if (stat(path_full, &statbuf) == 0) + goto found; +out: + return NULL; +found: + return udev_device_new_from_syspath(udev, path_full); +} + +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; + + /* follow "device" link in deprecated sys layout */ + if (strncmp(udev_device->devpath, "/class/", 7) == 0 || + strncmp(udev_device->devpath, "/block/", 7) == 0) { + util_strscpyl(path, sizeof(path), udev_device->syspath, "/device", NULL); + if (util_resolve_sys_link(udev_device->udev, path, sizeof(path)) == 0) { + udev_device_parent = udev_device_new_from_syspath(udev_device->udev, path); + if (udev_device_parent != NULL) + return udev_device_parent; + } + } + + util_strscpy(path, sizeof(path), udev_device->syspath); + subdir = &path[strlen(udev_get_sys_path(udev_device->udev))+1]; + while (1) { + 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; +} + +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 = 1; + udev_device->parent_device = device_new_from_parent(udev_device); + } + if (udev_device->parent_device != NULL) + dbg(udev_device->udev, "returning existing parent %p\n", udev_device->parent_device); + return udev_device->parent_device; +} + +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 && strcmp(parent_subsystem, subsystem) == 0) { + if (devtype == NULL) + break; + parent_devtype = udev_device_get_devtype(parent); + if (parent_devtype != NULL && strcmp(parent_devtype, devtype) == 0) + 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 + **/ +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 + **/ +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. + * + **/ +void udev_device_unref(struct udev_device *udev_device) +{ + if (udev_device == NULL) + return; + udev_device->refcount--; + if (udev_device->refcount > 0) + return; + 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_entries(udev_device->udev, &udev_device->devlinks_list); + udev_list_cleanup_entries(udev_device->udev, &udev_device->properties_list); + free(udev_device->action); + free(udev_device->driver); + free(udev_device->devpath_old); + free(udev_device->knodename); + udev_list_cleanup_entries(udev_device->udev, &udev_device->sysattr_list); + free(udev_device->envp); + free(udev_device->monitor_buf); + dbg(udev_device->udev, "udev_device: %p released\n", udev_device); + free(udev_device); +} + +/** + * 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 + **/ +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 + **/ +const char *udev_device_get_syspath(struct udev_device *udev_device) +{ + if (udev_device == NULL) + return NULL; + return udev_device->syspath; +} + +const char *udev_device_get_sysname(struct udev_device *udev_device) +{ + if (udev_device == NULL) + return NULL; + return udev_device->sysname; +} + +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 + **/ +const char *udev_device_get_devnode(struct udev_device *udev_device) +{ + if (udev_device == NULL) + return NULL; + if (!udev_device->info_loaded) + device_load_info(udev_device); + return udev_device->devnode; +} + +/** + * 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 + **/ +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 = 1; + /* read "subsytem" link */ + if (util_get_sys_subsystem(udev_device->udev, udev_device->syspath, subsystem, sizeof(subsystem)) > 0) { + udev_device_set_subsystem(udev_device, subsystem); + return udev_device->subsystem; + } + /* implicit names */ + if (strncmp(udev_device->devpath, "/module/", 8) == 0) { + 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 (strncmp(udev_device->devpath, "/subsystem/", 11) == 0 || + strncmp(udev_device->devpath, "/class/", 7) == 0 || + strncmp(udev_device->devpath, "/bus/", 5) == 0) { + udev_device_set_subsystem(udev_device, "subsystem"); + return udev_device->subsystem; + } + } + return udev_device->subsystem; +} + +/** + * 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 + **/ +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 = 1; + if (!udev_device->info_loaded) + udev_device_read_uevent_file(udev_device); + } + return udev_device->devtype; +} + +/** + * 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_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 + **/ +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) + device_load_info(udev_device); + return udev_list_get_entry(&udev_device->devlinks_list); +} + +void udev_device_cleanup_devlinks_list(struct udev_device *udev_device) +{ + udev_device->devlinks_uptodate = 0; + udev_list_cleanup_entries(udev_device->udev, &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_next(), + * which returns #NULL if no more entries exist. The property name + * can be retrieved from the list entry by udev_list_get_name(), + * the property value by udev_list_get_value(). + * + * Returns: the first entry of the property list + **/ +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) + device_load_info(udev_device); + if (!udev_device->devlinks_uptodate) { + char symlinks[UTIL_PATH_SIZE]; + struct udev_list_entry *list_entry; + + udev_device->devlinks_uptodate = 1; + list_entry = udev_device_get_devlinks_list_entry(udev_device); + if (list_entry != NULL) { + char *s; + size_t l; + + s = symlinks; + l = util_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 = util_strpcpyl(&s, l, " ", udev_list_entry_get_name(list_entry), NULL); + udev_device_add_property(udev_device, "DEVLINKS", symlinks); + } + } + return udev_list_get_entry(&udev_device->properties_list); +} + +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 = 1; + if (util_get_sys_driver(udev_device->udev, udev_device->syspath, driver, sizeof(driver)) > 0) + udev_device->driver = strdup(driver); + } + return udev_device->driver; +} + +dev_t udev_device_get_devnum(struct udev_device *udev_device) +{ + if (udev_device == NULL) + return makedev(0, 0); + if (!udev_device->info_loaded) + device_load_info(udev_device); + return udev_device->devnum; +} + +const char *udev_device_get_action(struct udev_device *udev_device) +{ + if (udev_device == NULL) + return NULL; + return udev_device->action; +} + +unsigned long long int udev_device_get_seqnum(struct udev_device *udev_device) +{ + if (udev_device == NULL) + return 0; + return udev_device->seqnum; +} + +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 */ + udev_list_entry_foreach(list_entry, udev_list_get_entry(&udev_device->sysattr_list)) { + if (strcmp(udev_list_entry_get_name(list_entry), sysattr) == 0) { + dbg(udev_device->udev, "got '%s' (%s) from cache\n", + sysattr, udev_list_entry_get_value(list_entry)); + return udev_list_entry_get_value(list_entry); + } + } + + util_strscpyl(path, sizeof(path), udev_device_get_syspath(udev_device), "/", sysattr, NULL); + if (lstat(path, &statbuf) != 0) { + dbg(udev_device->udev, "no attribute '%s', keep negative entry\n", path); + udev_list_entry_add(udev_device->udev, &udev_device->sysattr_list, sysattr, NULL, 0, 0); + goto out; + } + + if (S_ISLNK(statbuf.st_mode)) { + char target[UTIL_NAME_SIZE]; + int len; + char *pos; + + /* some core links return the last element of the target path */ + if (strcmp(sysattr, "driver") != 0 && + strcmp(sysattr, "subsystem") != 0 && + strcmp(sysattr, "module") != 0) + goto out; + + len = readlink(path, target, sizeof(target)); + if (len > 0) { + target[len] = '\0'; + pos = strrchr(target, '/'); + if (pos != NULL) { + pos = &pos[1]; + dbg(udev_device->udev, "cache '%s' with link value '%s'\n", sysattr, pos); + list_entry = udev_list_entry_add(udev_device->udev, &udev_device->sysattr_list, sysattr, pos, 0, 0); + val = udev_list_entry_get_value(list_entry); + } + } + 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); + if (fd < 0) { + dbg(udev_device->udev, "attribute '%s' can not be opened\n", path); + 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'); + dbg(udev_device->udev, "'%s' has attribute value '%s'\n", path, value); + list_entry = udev_list_entry_add(udev_device->udev, &udev_device->sysattr_list, sysattr, value, 0, 0); + val = udev_list_entry_get_value(list_entry); +out: + return val; +} + +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(udev_get_sys_path(udev_device->udev))]; + 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; +} + +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 = 1; + udev_device_add_property(udev_device, "SUBSYSTEM", udev_device->subsystem); + return 0; +} + +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 = 1; + udev_device_add_property(udev_device, "DEVTYPE", udev_device->devtype); + return 0; +} + +int udev_device_set_devnode(struct udev_device *udev_device, const char *devnode) +{ + free(udev_device->devnode); + udev_device->devnode = strdup(devnode); + if (devnode == NULL) + return 0; + 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) +{ + udev_device->devlinks_uptodate = 0; + if (udev_list_entry_add(udev_device->udev, &udev_device->devlinks_list, devlink, NULL, 1, 0) == NULL) + return -ENOMEM; + 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 = 0; + 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->udev, &udev_device->properties_list, key, value, 1, 0); +} + +struct udev_list_entry *udev_device_add_property_from_string(struct udev_device *udev_device, const char *property) +{ + char name[UTIL_PATH_SIZE]; + char *val; + + util_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); +} + +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); +} + +#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)) { + /* add string to envp array */ + udev_device->envp[i++] = s; + if (i+1 >= ENVP_SIZE) + return -EINVAL; + + /* add property string to monitor buffer */ + l = util_strpcpyl(&s, l, udev_list_entry_get_name(list_entry), "=", + udev_list_entry_get_value(list_entry), NULL); + if (l == 0) + return -EINVAL; + s++; + } + udev_device->envp[i] = NULL; + udev_device->monitor_buf_len = s - udev_device->monitor_buf; + udev_device->envp_uptodate = 1; + dbg(udev_device->udev, "filled envp/monitor buffer, %u properties, %zu bytes\n", + i, udev_device->monitor_buf_len); + 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_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 = 1; + udev_device_add_property(udev_device, "DRIVER", udev_device->driver); + return 0; +} + +const char *udev_device_get_devpath_old(struct udev_device *udev_device) +{ + return udev_device->devpath_old; +} + +int udev_device_set_devpath_old(struct udev_device *udev_device, const char *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); + return 0; +} + +const char *udev_device_get_knodename(struct udev_device *udev_device) +{ + return udev_device->knodename; +} + +int udev_device_set_knodename(struct udev_device *udev_device, const char *knodename) +{ + udev_device->knodename = strdup(knodename); + if (udev_device->knodename == NULL) + return -ENOMEM; + return 0; +} + +int udev_device_get_timeout(struct udev_device *udev_device) +{ + return udev_device->timeout; +} + +int udev_device_set_timeout(struct udev_device *udev_device, int timeout) +{ + udev_device->timeout = timeout; + return 0; +} +int udev_device_get_event_timeout(struct udev_device *udev_device) +{ + if (!udev_device->info_loaded) + device_load_info(udev_device); + return udev_device->event_timeout; +} + +int udev_device_set_event_timeout(struct udev_device *udev_device, int event_timeout) +{ + udev_device->event_timeout = event_timeout; + return 0; +} + +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_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; +} + +int udev_device_get_num_fake_partitions(struct udev_device *udev_device) +{ + if (!udev_device->info_loaded) + device_load_info(udev_device); + return udev_device->num_fake_partitions; +} + +int udev_device_set_num_fake_partitions(struct udev_device *udev_device, int num) +{ + udev_device->num_fake_partitions = num; + return 0; +} + +int udev_device_get_devlink_priority(struct udev_device *udev_device) +{ + if (!udev_device->info_loaded) + device_load_info(udev_device); + 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_ignore_remove(struct udev_device *udev_device) +{ + if (!udev_device->info_loaded) + device_load_info(udev_device); + return udev_device->ignore_remove; +} + +int udev_device_set_ignore_remove(struct udev_device *udev_device, int ignore) +{ + udev_device->ignore_remove = ignore; + return 0; +} + +int udev_device_get_watch_handle(struct udev_device *udev_device) +{ + if (!udev_device->info_loaded) + device_load_info(udev_device); + 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; +} |