/* * udev_db.c * * Copyright (C) 2003 Greg Kroah-Hartman * Copyright (C) 2004-2005 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 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., * 675 Mass Ave, Cambridge, MA 02139, USA. * */ #include #include #include #include #include #include #include #include #include #include "libsysfs/sysfs/libsysfs.h" #include "udev_libc_wrapper.h" #include "udev.h" #include "udev_utils.h" #include "logging.h" static int devpath_to_db_path(const char *devpath, char *filename, size_t len) { size_t start, end, i; /* add location of db files */ strlcpy(filename, udev_root, len); strlcat(filename, "/", len); start = strlcat(filename, DB_DIR, len); end = strlcat(filename, devpath, len); if (end > len) end = len; /* replace '/' to transform path into a filename */ for (i = start+1; i < end; i++) if (filename[i] == '/') filename[i] = PATH_TO_NAME_CHAR; return 0; } static int db_file_to_devpath(const char *filename, char *devpath, size_t len) { size_t end, i; strlcpy(devpath, "/", len); end = strlcat(devpath, filename, len); /* replace PATH_TO_NAME_CHAR to transform name into devpath */ for (i = 1; i < end; i++) if (devpath[i] == PATH_TO_NAME_CHAR) devpath[i] = '/'; return 0; } int udev_db_add_device(struct udevice *udev) { char filename[PATH_SIZE]; struct name_entry *name_loop; FILE *f; if (udev->test_run) return 0; /* don't write anything if udev created only the node with the * kernel name without any interesting data to remember */ if (strcmp(udev->name, udev->kernel_name) == 0 && list_empty(&udev->symlink_list) && list_empty(&udev->env_list) && !udev->partitions && !udev->ignore_remove) { dbg("nothing interesting to store in udevdb, skip"); goto exit; } devpath_to_db_path(udev->devpath, filename, sizeof(filename)); create_path(filename); 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->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); fprintf(f, "M:%u:%u\n", major(udev->devt), minor(udev->devt)); 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); exit: return 0; } int udev_db_get_device(struct udevice *udev, const char *devpath) { char filename[PATH_SIZE]; char line[PATH_SIZE]; unsigned int major, minor; char *bufline; char *buf; size_t bufsize; size_t cur; size_t count; devpath_to_db_path(devpath, filename, sizeof(filename)); if (file_map(filename, &buf, &bufsize) != 0) { info("no db file to read %s: %s", filename, strerror(errno)); return -1; } strlcpy(udev->devpath, devpath, sizeof(udev->devpath)); 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", &major, &minor); udev->devt = makedev(major, minor); 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 '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]; devpath_to_db_path(udev->devpath, filename, sizeof(filename)); unlink(filename); return 0; } int udev_db_lookup_name(const char *name, char *devpath, size_t len) { char dbpath[PATH_MAX]; DIR *dir; int found = 0; strlcpy(dbpath, udev_root, sizeof(dbpath)); strlcat(dbpath, "/", sizeof(dbpath)); strlcat(dbpath, DB_DIR, sizeof(dbpath)); dir = opendir(dbpath); if (dir == NULL) { err("unable to open udev_db '%s': %s", dbpath, strerror(errno)); return -1; } while (!found) { struct dirent *ent; char filename[PATH_SIZE]; char nodename[PATH_SIZE]; char *bufline; char *buf; size_t bufsize; size_t cur; size_t count; ent = readdir(dir); if (ent == NULL || ent->d_name[0] == '\0') break; if (ent->d_name[0] == '.') continue; snprintf(filename, sizeof(filename), "%s/%s", dbpath, ent->d_name); filename[sizeof(filename)-1] = '\0'; dbg("looking at '%s'", filename); if (file_map(filename, &buf, &bufsize) != 0) { err("unable to read db file '%s': %s", filename, strerror(errno)); continue; } cur = 0; while (cur < bufsize && !found) { count = buf_get_line(buf, bufsize, cur); bufline = &buf[cur]; cur += count+1; switch(bufline[0]) { case 'N': case 'S': if (count > sizeof(nodename)) count = sizeof(nodename); memcpy(nodename, &bufline[2], count-2); nodename[count-2] = '\0'; dbg("compare '%s' '%s'", nodename, name); if (strcmp(nodename, name) == 0) { db_file_to_devpath(ent->d_name, devpath, len); found = 1; } break; default: continue; } } file_unmap(buf, bufsize); } 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, "/", sizeof(dbpath)); strlcat(dbpath, DB_DIR, sizeof(dbpath)); dir = opendir(dbpath); if (dir == NULL) { err("unable to open udev_db '%s': %s", dbpath, strerror(errno)); return -1; } while (1) { struct dirent *ent; char filename[PATH_SIZE] = "/"; size_t end, i; ent = readdir(dir); if (ent == NULL || ent->d_name[0] == '\0') break; if (ent->d_name[0] == '.') continue; end = strlcat(filename, ent->d_name, sizeof(filename)); for (i = 1; i < end; i++) if (filename[i] == PATH_TO_NAME_CHAR) filename[i] = '/'; name_list_add(name_list, filename, 1); dbg("added '%s'", filename); } closedir(dir); return 0; }