NetBSD/usr.sbin/bthcid/config.c

210 lines
5.1 KiB
C

/* $NetBSD: config.c,v 1.4 2007/01/25 20:33:41 plunky Exp $ */
/*-
* Copyright (c) 2006 Itronix Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of Itronix Inc. may not be used to endorse
* or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY ITRONIX INC. ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ITRONIX INC. BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: config.c,v 1.4 2007/01/25 20:33:41 plunky Exp $");
#include <sys/time.h>
#include <prop/proplib.h>
#include <bluetooth.h>
#include <errno.h>
#include <event.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include "bthcid.h"
static const char *key_file = "/var/db/bthcid.keys";
static const char *new_key_file = "/var/db/bthcid.keys.new";
static prop_dictionary_t
load_keys(void)
{
prop_dictionary_t dict;
char *xml;
off_t len;
int fd;
fd = open(key_file, O_RDONLY, 0);
if (fd < 0)
return NULL;
len = lseek(fd, 0, SEEK_END);
if (len == 0) {
close(fd);
return NULL;
}
xml = malloc(len);
if (xml == NULL) {
close(fd);
return NULL;
}
(void)lseek(fd, 0, SEEK_SET);
if (read(fd, xml, len) != len) {
free(xml);
close(fd);
return NULL;
}
dict = prop_dictionary_internalize(xml);
free(xml);
close(fd);
return dict;
}
/*
* Look up key in keys file. We store a dictionary for each
* remote address, and inside that we have a data object for
* each local address containing the key.
*/
uint8_t *
lookup_key(bdaddr_t *laddr, bdaddr_t *raddr)
{
static uint8_t key[HCI_KEY_SIZE];
prop_dictionary_t cfg;
prop_object_t obj;
cfg = load_keys();
if (cfg == NULL)
return NULL;
obj = prop_dictionary_get(cfg, bt_ntoa(laddr, NULL));
if (obj == NULL || prop_object_type(obj) != PROP_TYPE_DICTIONARY) {
prop_object_release(cfg);
return NULL;
}
obj = prop_dictionary_get(obj, bt_ntoa(raddr, NULL));
if (obj == NULL || prop_object_type(obj) != PROP_TYPE_DATA
|| prop_data_size(obj) != sizeof(key)) {
prop_object_release(cfg);
return NULL;
}
memcpy(key, prop_data_data_nocopy(obj), sizeof(key));
prop_object_release(cfg);
return key;
}
void
save_key(bdaddr_t *laddr, bdaddr_t *raddr, uint8_t *key)
{
prop_dictionary_t cfg, dev;
prop_data_t dat;
char *xml;
int fd;
size_t len;
cfg = load_keys();
if (cfg == NULL) {
cfg = prop_dictionary_create();
if (cfg == NULL) {
syslog(LOG_ERR, "prop_dictionary_create() failed: %m");
return;
}
}
dev = prop_dictionary_get(cfg, bt_ntoa(laddr, NULL));
if (dev == NULL) {
dev = prop_dictionary_create();
if (dev == NULL) {
syslog(LOG_ERR, "prop_dictionary_create() failed: %m");
prop_object_release(cfg);
return;
}
if (!prop_dictionary_set(cfg, bt_ntoa(laddr, NULL), dev)) {
syslog(LOG_ERR, "prop_dictionary_set() failed: %m");
prop_object_release(dev);
prop_object_release(cfg);
return;
}
prop_object_release(dev);
}
dat = prop_data_create_data_nocopy(key, HCI_KEY_SIZE);
if (dat == NULL) {
syslog(LOG_ERR, "Cannot create data object: %m");
prop_object_release(cfg);
return;
}
if (!prop_dictionary_set(dev, bt_ntoa(raddr, NULL), dat)) {
syslog(LOG_ERR, "prop_dictionary_set() failed: %m");
prop_object_release(dat);
prop_object_release(cfg);
return;
}
prop_object_release(dat);
xml = prop_dictionary_externalize(cfg);
if (xml == NULL) {
syslog(LOG_ERR, "prop_dictionary_externalize() failed: %m");
prop_object_release(cfg);
return;
}
prop_object_release(cfg);
fd = open(new_key_file, O_WRONLY|O_TRUNC|O_CREAT|O_EXLOCK, 0600);
if (fd < 0) {
syslog(LOG_ERR, "Cannot open new keyfile %s: %m", key_file);
free(xml);
return;
}
len = strlen(xml);
if (write(fd, xml, len) != len) {
syslog(LOG_ERR, "Write of keyfile failed: %m");
free(xml);
close(fd);
unlink(new_key_file);
return;
}
free(xml);
close(fd);
if (rename(new_key_file, key_file) < 0) {
syslog(LOG_ERR, "rename(%s, %s) failed: %m",
new_key_file, key_file);
unlink(new_key_file);
}
}