/*** 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 <stdlib.h> #include <stdio.h> #include <string.h> #include <stddef.h> #include <stdbool.h> #include <unistd.h> #include <fcntl.h> #include <sys/stat.h> #include "libudev.h" #include "libudev-private.h" static void udev_device_tag(struct udev_device *dev, const char *tag, bool add) { const char *id; char filename[UTIL_PATH_SIZE]; id = udev_device_get_id_filename(dev); if (id == NULL) return; strscpyl(filename, sizeof(filename), "/run/udev/tags/", tag, "/", id, NULL); if (add) { int fd; mkdir_parents(filename, 0755); fd = open(filename, O_WRONLY|O_CREAT|O_CLOEXEC|O_TRUNC|O_NOFOLLOW, 0444); if (fd >= 0) close(fd); } else { unlink(filename); } } int udev_device_tag_index(struct udev_device *dev, struct udev_device *dev_old, bool add) { struct udev_list_entry *list_entry; bool found; if (add && dev_old != NULL) { /* delete possible left-over tags */ udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(dev_old)) { const char *tag_old = udev_list_entry_get_name(list_entry); struct udev_list_entry *list_entry_current; found = false; udev_list_entry_foreach(list_entry_current, udev_device_get_tags_list_entry(dev)) { const char *tag = udev_list_entry_get_name(list_entry_current); if (streq(tag, tag_old)) { found = true; break; } } if (!found) udev_device_tag(dev_old, tag_old, false); } } udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(dev)) udev_device_tag(dev, udev_list_entry_get_name(list_entry), add); return 0; } static bool device_has_info(struct udev_device *udev_device) { struct udev_list_entry *list_entry; if (udev_device_get_devlinks_list_entry(udev_device) != NULL) return true; if (udev_device_get_devlink_priority(udev_device) != 0) return true; udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device)) if (udev_list_entry_get_num(list_entry)) return true; if (udev_device_get_tags_list_entry(udev_device) != NULL) return true; if (udev_device_get_watch_handle(udev_device) >= 0) return true; return false; } int udev_device_update_db(struct udev_device *udev_device) { struct udev *udev = udev_device_get_udev(udev_device); bool has_info; const char *id; char filename[UTIL_PATH_SIZE]; char filename_tmp[UTIL_PATH_SIZE]; FILE *f; int r; id = udev_device_get_id_filename(udev_device); if (id == NULL) return -1; has_info = device_has_info(udev_device); strscpyl(filename, sizeof(filename), "/run/udev/data/", id, NULL); /* do not store anything for otherwise empty devices */ if (!has_info && major(udev_device_get_devnum(udev_device)) == 0 && udev_device_get_ifindex(udev_device) == 0) { unlink(filename); return 0; } /* write a database file */ strscpyl(filename_tmp, sizeof(filename_tmp), filename, ".tmp", NULL); mkdir_parents(filename_tmp, 0755); f = fopen(filename_tmp, "we"); if (f == NULL) { udev_err(udev, "unable to create temporary db file '%s': %m\n", filename_tmp); return -1; } /* * set 'sticky' bit to indicate that we should not clean the * database when we transition from initramfs to the real root */ if (udev_device_get_db_persist(udev_device)) fchmod(fileno(f), 01644); if (has_info) { struct udev_list_entry *list_entry; if (major(udev_device_get_devnum(udev_device)) > 0) { udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(udev_device)) fprintf(f, "S:%s\n", udev_list_entry_get_name(list_entry) + strlen("/dev/")); if (udev_device_get_devlink_priority(udev_device) != 0) fprintf(f, "L:%i\n", udev_device_get_devlink_priority(udev_device)); if (udev_device_get_watch_handle(udev_device) >= 0) fprintf(f, "W:%i\n", udev_device_get_watch_handle(udev_device)); } if (udev_device_get_usec_initialized(udev_device) > 0) fprintf(f, "I:%llu\n", (unsigned long long)udev_device_get_usec_initialized(udev_device)); udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device)) { if (!udev_list_entry_get_num(list_entry)) continue; fprintf(f, "E:%s=%s\n", udev_list_entry_get_name(list_entry), udev_list_entry_get_value(list_entry)); } udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(udev_device)) fprintf(f, "G:%s\n", udev_list_entry_get_name(list_entry)); } fclose(f); r = rename(filename_tmp, filename); if (r < 0) return -1; udev_dbg(udev, "created %s file '%s' for '%s'\n", has_info ? "db" : "empty", filename, udev_device_get_devpath(udev_device)); return 0; } int udev_device_delete_db(struct udev_device *udev_device) { const char *id; char filename[UTIL_PATH_SIZE]; id = udev_device_get_id_filename(udev_device); if (id == NULL) return -1; strscpyl(filename, sizeof(filename), "/run/udev/data/", id, NULL); unlink(filename); return 0; }