udev_db.c revision aa8734ffcb8a895fc8d66ff383cbcf8f4b78f562
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen/*
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen * Copyright (C) 2008 Kay Sievers <kay.sievers@vrfy.org>
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen *
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen * This program is free software: you can redistribute it and/or modify
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen * it under the terms of the GNU General Public License as published by
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen * the Free Software Foundation, either version 2 of the License, or
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen * (at your option) any later version.
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen *
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen * This program is distributed in the hope that it will be useful,
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen * but WITHOUT ANY WARRANTY; without even the implied warranty of
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen * GNU General Public License for more details.
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen *
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen * You should have received a copy of the GNU General Public License
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen * along with this program. If not, see <http://www.gnu.org/licenses/>.
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen */
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen#include <stdlib.h>
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen#include <stdio.h>
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen#include <string.h>
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen#include <stddef.h>
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen#include <unistd.h>
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen#include <fcntl.h>
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen#include <string.h>
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen#include <sys/stat.h>
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen#include "udev.h"
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainenstatic size_t devpath_to_db_path(struct udev *udev, const char *devpath, char *filename, size_t len)
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen{
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen size_t start;
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen /* translate to location of db file */
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen util_strlcpy(filename, udev_get_dev_path(udev), len);
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen start = util_strlcat(filename, "/.udev/db/", len);
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen util_strlcat(filename, devpath, len);
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen return util_path_encode(&filename[start], len - start);
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen}
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainenint udev_device_update_db(struct udev_device *udev_device)
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen{
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen struct udev *udev = udev_device_get_udev(udev_device);
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen char filename[UTIL_PATH_SIZE];
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen FILE *f;
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen char target[232]; /* on 64bit, tmpfs inlines up to 239 bytes */
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen size_t devlen = strlen(udev_get_dev_path(udev))+1;
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen struct udev_list_entry *list_entry;
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen int ret;
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen devpath_to_db_path(udev,
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen udev_device_get_devpath(udev_device),
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen filename, sizeof(filename));
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen create_path(udev, filename);
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen unlink(filename);
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device))
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen if (udev_list_entry_get_flag(list_entry))
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen goto file;
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen if (udev_device_get_num_fake_partitions(udev_device))
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen goto file;
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen if (udev_device_get_ignore_remove(udev_device))
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen goto file;
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen /* try not to waste tmpfs memory; store values, if they fit, in a symlink target */
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen util_strlcpy(target, &udev_device_get_devnode(udev_device)[devlen], sizeof(target));
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(udev_device)) {
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen size_t len;
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen util_strlcat(target, " ", sizeof(target));
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen len = util_strlcat(target, &udev_list_entry_get_name(list_entry)[devlen], sizeof(target));
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen if (len >= sizeof(target)) {
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen info(udev, "size of links too large, create file\n");
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen goto file;
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen }
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen }
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen info(udev, "create db link (%s)\n", target);
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen udev_selinux_setfscreatecon(udev, filename, S_IFLNK);
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen ret = symlink(target, filename);
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen udev_selinux_resetfscreatecon(udev);
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen if (ret == 0)
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen goto out;
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainenfile:
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen f = fopen(filename, "w");
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen if (f == NULL) {
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen err(udev, "unable to create db file '%s': %m\n", filename);
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen return -1;
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen }
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen info(udev, "created db file for '%s' in '%s'\n", udev_device_get_devpath(udev_device), filename);
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen fprintf(f, "N:%s\n", &udev_device_get_devnode(udev_device)[devlen]);
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(udev_device))
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen fprintf(f, "S:%s\n", &udev_list_entry_get_name(list_entry)[devlen]);
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen if (udev_device_get_devlink_priority(udev_device) != 0)
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen fprintf(f, "L:%u\n", udev_device_get_devlink_priority(udev_device));
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen if (udev_device_get_event_timeout(udev_device) >= 0)
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen fprintf(f, "T:%u\n", udev_device_get_event_timeout(udev_device));
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen if (udev_device_get_num_fake_partitions(udev_device) != 0)
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen fprintf(f, "A:%u\n", udev_device_get_num_fake_partitions(udev_device));
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen if (udev_device_get_ignore_remove(udev_device))
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen fprintf(f, "R:%u\n", udev_device_get_ignore_remove(udev_device));
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device)) {
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen if (!udev_list_entry_get_flag(list_entry))
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen continue;
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen fprintf(f, "E:%s=%s\n",
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen udev_list_entry_get_name(list_entry),
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen udev_list_entry_get_value(list_entry));
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen }
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen fclose(f);
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainenout:
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen return 0;
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen}
a1973d0f171b027f9a7c642bc1c2134293731e1cTimo Sirainen
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainenint udev_device_delete_db(struct udev_device *udev_device)
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen{
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen char filename[UTIL_PATH_SIZE];
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen devpath_to_db_path(udev_device_get_udev(udev_device),
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen udev_device_get_devpath(udev_device),
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen filename, sizeof(filename));
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen unlink(filename);
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen return 0;
39025a2dabfcfaeee3790988b9ea00d19887a3d3Timo Sirainen}
int udev_device_rename_db(struct udev_device *udev_device, const char *devpath_old)
{
char filename_old[UTIL_PATH_SIZE];
char filename[UTIL_PATH_SIZE];
devpath_to_db_path(udev_device_get_udev(udev_device),
devpath_old,
filename_old, sizeof(filename_old));
devpath_to_db_path(udev_device_get_udev(udev_device),
udev_device_get_devpath(udev_device),
filename, sizeof(filename));
return rename(filename_old, filename);
}