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/*
* 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)
{
struct udev *udev = udev_device_get_udev(dev);
char filename[UTIL_PATH_SIZE];
util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.udev/tags/", tag, "/",
udev_device_get_subsystem(dev), ":", udev_device_get_sysname(dev), NULL);
if (add) {
util_create_path(udev, filename);
symlink(udev_device_get_devpath(dev), filename);
/* possibly cleanup old entries after a device renaming */
if (udev_device_get_sysname_old(dev) != NULL) {
char filename_old[UTIL_PATH_SIZE];
util_strscpyl(filename_old, sizeof(filename_old), udev_get_dev_path(udev), "/.udev/tags/", tag, "/",
udev_device_get_subsystem(dev), ":", udev_device_get_sysname_old(dev), NULL);
unlink(filename_old);
}
} 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 (strcmp(tag, tag_old) == 0) {
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;
}
int udev_device_update_db(struct udev_device *udev_device)
{
struct udev *udev = udev_device_get_udev(udev_device);
char filename[UTIL_PATH_SIZE];
char filename_tmp[UTIL_PATH_SIZE];
FILE *f;
char target[232]; /* on 64bit, tmpfs inlines up to 239 bytes */
size_t devlen = strlen(udev_get_dev_path(udev))+1;
char *s;
size_t l;
struct udev_list_entry *list_entry;
int ret;
util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.udev/db/",
udev_device_get_subsystem(udev_device), ":", udev_device_get_sysname(udev_device), NULL);
util_strscpyl(filename_tmp, sizeof(filename_tmp), filename, ".tmp", NULL);
udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device))
if (udev_list_entry_get_flags(list_entry))
goto file;
if (udev_device_get_tags_list_entry(udev_device) != NULL)
goto file;
if (udev_device_get_devlink_priority(udev_device) != 0)
goto file;
if (udev_device_get_event_timeout(udev_device) >= 0)
goto file;
if (udev_device_get_watch_handle(udev_device) >= 0)
goto file;
if (udev_device_get_devnode(udev_device) == NULL)
goto out;
/*
* if we have only the node and symlinks to store, try not to waste
* tmpfs memory -- store values, if they fit, in a symlink target
*/
s = target;
l = util_strpcpy(&s, sizeof(target), &udev_device_get_devnode(udev_device)[devlen]);
udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(udev_device)) {
l = util_strpcpyl(&s, l, " ", &udev_list_entry_get_name(list_entry)[devlen], NULL);
if (l == 0) {
info(udev, "size of links too large, create file\n");
goto file;
}
}
udev_selinux_setfscreatecon(udev, filename_tmp, S_IFLNK);
util_create_path(udev, filename_tmp);
ret = symlink(target, filename_tmp);
udev_selinux_resetfscreatecon(udev);
if (ret != 0)
goto file;
ret = rename(filename_tmp, filename);
if (ret != 0)
goto file;
info(udev, "created db link (%s)\n", target);
goto out;
file:
util_create_path(udev, filename_tmp);
f = fopen(filename_tmp, "w");
if (f == NULL) {
err(udev, "unable to create temporary db file '%s': %m\n", filename_tmp);
return -1;
}
if (udev_device_get_devnode(udev_device) != NULL) {
fprintf(f, "N:%s\n", &udev_device_get_devnode(udev_device)[devlen]);
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)[devlen]);
}
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_event_timeout(udev_device) >= 0)
fprintf(f, "T:%i\n", udev_device_get_event_timeout(udev_device));
if (udev_device_get_watch_handle(udev_device) >= 0)
fprintf(f, "W:%i\n", udev_device_get_watch_handle(udev_device));
udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device)) {
if (!udev_list_entry_get_flags(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);
info(udev, "created db file for '%s' in '%s'\n", udev_device_get_devpath(udev_device), filename);
out:
return 0;
}
int udev_device_delete_db(struct udev_device *udev_device)
{
struct udev *udev = udev_device_get_udev(udev_device);
char filename[UTIL_PATH_SIZE];
util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.udev/db/",
udev_device_get_subsystem(udev_device), ":", udev_device_get_sysname(udev_device), NULL);
unlink(filename);
return 0;
}
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