/* * libudev - interface to udev device information * * Copyright (C) 2008 Kay Sievers * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #include #include #include #include #include #include #include #include #include #include #include "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 *physdevpath; 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; 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) { size_t start; /* translate to location of db file */ util_strlcpy(filename, udev_get_dev_path(udev), len); start = util_strlcat(filename, "/.udev/db/", len); util_strlcat(filename, devpath, len); return util_path_encode(&filename[start], len - start); } 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_strlcpy(devnode, udev_get_dev_path(udev_device->udev), sizeof(devnode)); util_strlcat(devnode, "/", sizeof(devnode)); util_strlcat(devnode, target, sizeof(devnode)); 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_strlcpy(devlink, udev_get_dev_path(udev_device->udev), sizeof(devlink)); util_strlcat(devlink, "/", sizeof(devlink)); util_strlcat(devlink, lnk, sizeof(devlink)); 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_strlcpy(filename, udev_get_dev_path(udev_device->udev), sizeof(filename)); util_strlcat(filename, "/", sizeof(filename)); util_strlcat(filename, val, sizeof(filename)); udev_device_set_devnode(udev_device, filename); break; case 'S': util_strlcpy(filename, udev_get_dev_path(udev_device->udev), sizeof(filename)); util_strlcat(filename, "/", sizeof(filename)); util_strlcat(filename, val, sizeof(filename)); 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; } } 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_strlcpy(filename, udev_device->syspath, sizeof(filename)); util_strlcat(filename, "/uevent", sizeof(filename)); 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); 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; /* 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 < &subdir[2]) { dbg(udev, "not a subdir :%s\n", syspath); return NULL; } /* resolve possible symlink to real path */ util_strlcpy(path, syspath, sizeof(path)); 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_strlcpy(block, path, sizeof(block)); pos = strrchr(block, '/'); if (pos == NULL) return NULL; util_strlcpy(part, pos, sizeof(part)); pos[0] = '\0'; if (util_resolve_sys_link(udev, block, sizeof(block)) == 0) { util_strlcpy(path, block, sizeof(path)); util_strlcat(path, part, sizeof(path)); } } /* 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_strlcpy(file, path, sizeof(file)); util_strlcat(file, "/uevent", sizeof(file)); 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}/: 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) { size_t sys_path_len; char path_full[UTIL_PATH_SIZE]; char *path; struct stat statbuf; sys_path_len = util_strlcpy(path_full, udev_get_sys_path(udev), sizeof(path_full)); path = &path_full[sys_path_len]; if (strcmp(subsystem, "subsystem") == 0) { util_strlcpy(path, "/subsystem/", sizeof(path_full) - sys_path_len); util_strlcat(path, sysname, sizeof(path_full) - sys_path_len); if (stat(path_full, &statbuf) == 0) goto found; util_strlcpy(path, "/bus/", sizeof(path_full) - sys_path_len); util_strlcat(path, sysname, sizeof(path_full) - sys_path_len); if (stat(path_full, &statbuf) == 0) goto found; util_strlcpy(path, "/class/", sizeof(path_full) - sys_path_len); util_strlcat(path, sysname, sizeof(path_full) - sys_path_len); if (stat(path_full, &statbuf) == 0) goto found; goto out; } if (strcmp(subsystem, "module") == 0) { util_strlcpy(path, "/module/", sizeof(path_full) - sys_path_len); util_strlcat(path, sysname, sizeof(path_full) - sys_path_len); if (stat(path_full, &statbuf) == 0) goto found; goto out; } if (strcmp(subsystem, "drivers") == 0) { char subsys[UTIL_NAME_SIZE]; char *driver; util_strlcpy(subsys, sysname, sizeof(subsys)); driver = strchr(subsys, ':'); if (driver != NULL) { driver[0] = '\0'; driver = &driver[1]; util_strlcpy(path, "/subsystem/", sizeof(path_full) - sys_path_len); util_strlcat(path, subsys, sizeof(path_full) - sys_path_len); util_strlcat(path, "/drivers/", sizeof(path_full) - sys_path_len); util_strlcat(path, driver, sizeof(path_full) - sys_path_len); if (stat(path_full, &statbuf) == 0) goto found; util_strlcpy(path, "/bus/", sizeof(path_full) - sys_path_len); util_strlcat(path, subsys, sizeof(path_full) - sys_path_len); util_strlcat(path, "/drivers/", sizeof(path_full) - sys_path_len); util_strlcat(path, driver, sizeof(path_full) - sys_path_len); if (stat(path_full, &statbuf) == 0) goto found; } goto out; } util_strlcpy(path, "/subsystem/", sizeof(path_full) - sys_path_len); util_strlcat(path, subsystem, sizeof(path_full) - sys_path_len); util_strlcat(path, "/devices/", sizeof(path_full) - sys_path_len); util_strlcat(path, sysname, sizeof(path_full) - sys_path_len); if (stat(path_full, &statbuf) == 0) goto found; util_strlcpy(path, "/bus/", sizeof(path_full) - sys_path_len); util_strlcat(path, subsystem, sizeof(path_full) - sys_path_len); util_strlcat(path, "/devices/", sizeof(path_full) - sys_path_len); util_strlcat(path, sysname, sizeof(path_full) - sys_path_len); if (stat(path_full, &statbuf) == 0) goto found; util_strlcpy(path, "/class/", sizeof(path_full) - sys_path_len); util_strlcat(path, subsystem, sizeof(path_full) - sys_path_len); util_strlcat(path, "/", sizeof(path_full) - sys_path_len); util_strlcat(path, sysname, sizeof(path_full) - sys_path_len); 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_strlcpy(path, udev_device->syspath, sizeof(path)); util_strlcat(path, "/device", sizeof(path)); 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_strlcpy(path, udev_device->syspath, sizeof(path)); 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->physdevpath); 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) { util_strlcpy(symlinks, udev_list_entry_get_name(list_entry), sizeof(symlinks)); udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry)) { util_strlcat(symlinks, " ", sizeof(symlinks)); util_strlcat(symlinks, udev_list_entry_get_name(list_entry), sizeof(symlinks)); } 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_strlcpy(path, udev_device_get_syspath(udev_device), sizeof(path)); util_strlcat(path, "/", sizeof(path)); util_strlcat(path, sysattr, sizeof(path)); 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_strlcpy(name, property, sizeof(name)); 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) { const char *action; struct udev_list_entry *list_entry; size_t bufpos; size_t len; 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; /* header @ */ action = udev_device_get_action(udev_device); if (action == NULL) return -EINVAL; bufpos = util_strlcpy(udev_device->monitor_buf, action, MONITOR_BUF_SIZE); len = util_strlcpy(&udev_device->monitor_buf[bufpos], "@", MONITOR_BUF_SIZE-bufpos); if (len >= MONITOR_BUF_SIZE-bufpos) return -EINVAL; bufpos += len; len = util_strlcpy(&udev_device->monitor_buf[bufpos], udev_device_get_devpath(udev_device), MONITOR_BUF_SIZE-bufpos); if (len+1 >= MONITOR_BUF_SIZE-bufpos) return -EINVAL; bufpos += len+1; i = 0; udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device)) { /* add string to envp array */ udev_device->envp[i++] = &udev_device->monitor_buf[bufpos]; if (i+1 >= ENVP_SIZE) return -EINVAL; /* add property string to monitor buffer */ len = util_strlcpy(&udev_device->monitor_buf[bufpos], udev_list_entry_get_name(list_entry), MONITOR_BUF_SIZE-bufpos); if (len >= MONITOR_BUF_SIZE-bufpos) return -EINVAL; bufpos += len; len = util_strlcpy(&udev_device->monitor_buf[bufpos], "=", MONITOR_BUF_SIZE-bufpos); if (len >= MONITOR_BUF_SIZE-bufpos) return -EINVAL; bufpos += len; len = util_strlcpy(&udev_device->monitor_buf[bufpos], udev_list_entry_get_value(list_entry), MONITOR_BUF_SIZE-bufpos); if (len+1 >= MONITOR_BUF_SIZE-bufpos) return -EINVAL; bufpos += len+1; } udev_device->envp[i] = NULL; udev_device->monitor_buf_len = bufpos; udev_device->envp_uptodate = 1; dbg(udev_device->udev, "filled envp/monitor buffer, %u properties, %zu bytes\n", i, bufpos); 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_physdevpath(struct udev_device *udev_device) { return udev_device->physdevpath; } int udev_device_set_physdevpath(struct udev_device *udev_device, const char *physdevpath) { udev_device->physdevpath = strdup(physdevpath); if (udev_device->physdevpath == 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; }