| /* |
| * libudev - interface to udev device information |
| * |
| * Copyright (C) 2008-2010 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 <stdlib.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <stddef.h> |
| #include <stdbool.h> |
| #include <unistd.h> |
| #include <fcntl.h> |
| #include <string.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; |
| util_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; |
| |
| id = udev_device_get_id_filename(udev_device); |
| if (id == NULL) |
| return -1; |
| |
| has_info = device_has_info(udev_device); |
| util_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 */ |
| util_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", 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); |
| rename(filename_tmp, filename); |
| 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; |
| util_strscpyl(filename, sizeof(filename), "/run/udev/data/", id, NULL); |
| unlink(filename); |
| return 0; |
| } |