/* * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com> * Copyright (C) 2004-2005 Kay Sievers <kay.sievers@vrfy.org> * * 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 version 2 of the License. * * 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, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * */ #include <stdlib.h> #include <stdio.h> #include <string.h> #include <stddef.h> #include <unistd.h> #include <fcntl.h> #include <string.h> #include <errno.h> #include <dirent.h> #include <sys/stat.h> #include <sys/types.h> #include "udev.h" static size_t devpath_to_db_path(const char *devpath, char *filename, size_t len) { size_t start; /* add location of db files */ strlcpy(filename, udev_root, len); start = strlcat(filename, "/"DB_DIR"/", len); strlcat(filename, devpath, len); return path_encode(&filename[start], len - start); } /* reverse mapping from the device file name to the devpath */ static int name_index(const char *devpath, const char *name, int add) { char device[PATH_SIZE]; char filename[PATH_SIZE * 2]; size_t start; int fd; /* directory with device name */ strlcpy(filename, udev_root, sizeof(filename)); start = strlcat(filename, "/"DB_NAME_INDEX_DIR"/", sizeof(filename)); strlcat(filename, name, sizeof(filename)); path_encode(&filename[start], sizeof(filename) - start); /* entry with the devpath */ strlcpy(device, devpath, sizeof(device)); path_encode(device, sizeof(device)); strlcat(filename, "/", sizeof(filename)); strlcat(filename, device, sizeof(filename)); if (add) { info("creating index: '%s'", filename); create_path(filename); fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644); if (fd > 0) close(fd); } else { info("removing index: '%s'", filename); unlink(filename); delete_path(filename); } return 0; } int udev_db_get_devices_by_name(const char *name, struct list_head *name_list) { char dirname[PATH_MAX]; size_t start; DIR *dir; int rc = 0; strlcpy(dirname, udev_root, sizeof(dirname)); start = strlcat(dirname, "/"DB_NAME_INDEX_DIR"/", sizeof(dirname)); strlcat(dirname, name, sizeof(dirname)); path_encode(&dirname[start], sizeof(dirname) - start); dir = opendir(dirname); if (dir == NULL) { info("no index directory '%s': %s", dirname, strerror(errno)); rc = -1; goto out; } info("found index directory '%s'", dirname); while (1) { struct dirent *ent; char device[PATH_SIZE]; ent = readdir(dir); if (ent == NULL || ent->d_name[0] == '\0') break; if (ent->d_name[0] == '.') continue; strlcpy(device, ent->d_name, sizeof(device)); path_decode(device); name_list_add(name_list, device, 0); rc++; } closedir(dir); out: return rc; } int udev_db_add_device(struct udevice *udev) { char filename[PATH_SIZE]; if (udev->test_run) return 0; devpath_to_db_path(udev->dev->devpath, filename, sizeof(filename)); create_path(filename); unlink(filename); /* * don't waste tmpfs memory pages, if we don't have any data to store * create fake db-file; store the node-name in a symlink target */ if (list_empty(&udev->symlink_list) && list_empty(&udev->env_list) && !udev->partitions && !udev->ignore_remove) { dbg("nothing interesting to store, create symlink"); if (symlink(udev->name, filename) != 0) { err("unable to create db link '%s': %s", filename, strerror(errno)); return -1; } } else { FILE *f; struct name_entry *name_loop; f = fopen(filename, "w"); if (f == NULL) { err("unable to create db file '%s': %s", filename, strerror(errno)); return -1; } dbg("storing data for device '%s' in '%s'", udev->dev->devpath, filename); fprintf(f, "N:%s\n", udev->name); list_for_each_entry(name_loop, &udev->symlink_list, node) { fprintf(f, "S:%s\n", name_loop->name); /* add symlink-name to index */ name_index(udev->dev->devpath, name_loop->name, 1); } fprintf(f, "M:%u:%u\n", major(udev->devt), minor(udev->devt)); if (udev->link_priority) fprintf(f, "L:%u\n", udev->link_priority); if (udev->partitions) fprintf(f, "A:%u\n", udev->partitions); if (udev->ignore_remove) fprintf(f, "R:%u\n", udev->ignore_remove); list_for_each_entry(name_loop, &udev->env_list, node) fprintf(f, "E:%s\n", name_loop->name); fclose(f); } /* add name to index */ name_index(udev->dev->devpath, udev->name, 1); return 0; } int udev_db_get_device(struct udevice *udev, const char *devpath) { struct stat stats; char filename[PATH_SIZE]; char line[PATH_SIZE]; unsigned int maj, min; char *bufline; char *buf; size_t bufsize; size_t cur; size_t count; strlcpy(udev->dev->devpath, devpath, sizeof(udev->dev->devpath)); devpath_to_db_path(devpath, filename, sizeof(filename)); if (lstat(filename, &stats) != 0) { info("no db file to read %s: %s", filename, strerror(errno)); return -1; } if ((stats.st_mode & S_IFMT) == S_IFLNK) { char target[NAME_SIZE]; int target_len; info("found a symlink as db file"); target_len = readlink(filename, target, sizeof(target)); if (target_len > 0) target[target_len] = '\0'; else { info("error reading db link %s: %s", filename, strerror(errno)); return -1; } dbg("db link points to '%s'", target); strlcpy(udev->name, target, sizeof(udev->name)); return 0; } if (file_map(filename, &buf, &bufsize) != 0) { info("error reading db file %s: %s", filename, strerror(errno)); return -1; } cur = 0; while (cur < bufsize) { count = buf_get_line(buf, bufsize, cur); bufline = &buf[cur]; cur += count+1; switch(bufline[0]) { case 'N': if (count > sizeof(udev->name)) count = sizeof(udev->name); memcpy(udev->name, &bufline[2], count-2); udev->name[count-2] = '\0'; break; case 'M': if (count > sizeof(line)) count = sizeof(line); memcpy(line, &bufline[2], count-2); line[count-2] = '\0'; sscanf(line, "%u:%u", &maj, &min); udev->devt = makedev(maj, min); break; case 'S': if (count > sizeof(line)) count = sizeof(line); memcpy(line, &bufline[2], count-2); line[count-2] = '\0'; name_list_add(&udev->symlink_list, line, 0); break; case 'L': if (count > sizeof(line)) count = sizeof(line); memcpy(line, &bufline[2], count-2); line[count-2] = '\0'; udev->link_priority = atoi(line); break; case 'A': if (count > sizeof(line)) count = sizeof(line); memcpy(line, &bufline[2], count-2); line[count-2] = '\0'; udev->partitions = atoi(line); break; case 'R': if (count > sizeof(line)) count = sizeof(line); memcpy(line, &bufline[2], count-2); line[count-2] = '\0'; udev->ignore_remove = atoi(line); break; case 'E': if (count > sizeof(line)) count = sizeof(line); memcpy(line, &bufline[2], count-2); line[count-2] = '\0'; name_list_add(&udev->env_list, line, 0); break; } } file_unmap(buf, bufsize); if (udev->name[0] == '\0') return -1; return 0; } int udev_db_delete_device(struct udevice *udev) { char filename[PATH_SIZE]; struct name_entry *name_loop; devpath_to_db_path(udev->dev->devpath, filename, sizeof(filename)); unlink(filename); name_index(udev->dev->devpath, udev->name, 0); list_for_each_entry(name_loop, &udev->symlink_list, node) name_index(udev->dev->devpath, name_loop->name, 0); return 0; } int udev_db_lookup_name(const char *name, char *devpath, size_t len) { char dirname[PATH_MAX]; size_t start; DIR *dir; int found = 0; strlcpy(dirname, udev_root, sizeof(dirname)); start = strlcat(dirname, "/"DB_NAME_INDEX_DIR"/", sizeof(dirname)); strlcat(dirname, name, sizeof(dirname)); path_encode(&dirname[start], sizeof(dirname) - start); dir = opendir(dirname); if (dir == NULL) { info("no index directory '%s': %s", dirname, strerror(errno)); return -1; } info("found index directory '%s'", dirname); while (!found) { struct dirent *ent; char device[PATH_SIZE]; struct udevice *udev; ent = readdir(dir); if (ent == NULL || ent->d_name[0] == '\0') break; if (ent->d_name[0] == '.') continue; strlcpy(device, ent->d_name, sizeof(device)); path_decode(device); udev = udev_device_init(NULL); if (udev == NULL) break; if (udev_db_get_device(udev, device) == 0) { char filename[PATH_SIZE]; struct stat statbuf; info("found db entry '%s'", device); strlcpy(filename, udev_root, sizeof(filename)); strlcat(filename, "/", sizeof(filename)); strlcat(filename, name, sizeof(filename)); /* make sure device entry matches dev_t */ if (stat(filename, &statbuf) == 0) { if (statbuf.st_rdev == udev->devt) { info("node '%s' matches dev_t", udev->name); strlcpy(devpath, device, len); found = 1; } } } udev_device_cleanup(udev); } closedir(dir); if (found) return 0; else return -1; } int udev_db_get_all_entries(struct list_head *name_list) { char dbpath[PATH_MAX]; DIR *dir; strlcpy(dbpath, udev_root, sizeof(dbpath)); strlcat(dbpath, "/"DB_DIR, sizeof(dbpath)); dir = opendir(dbpath); if (dir == NULL) { info("no udev_db available '%s': %s", dbpath, strerror(errno)); return -1; } while (1) { struct dirent *ent; char device[PATH_SIZE]; ent = readdir(dir); if (ent == NULL || ent->d_name[0] == '\0') break; if (ent->d_name[0] == '.') continue; strlcpy(device, ent->d_name, sizeof(device)); path_decode(device); name_list_add(name_list, device, 1); dbg("added '%s'", device); } closedir(dir); return 0; }