/*      $NetBSD: db.c,v 1.6 2020/06/07 00:12:00 thorpej Exp $   */

/*-
* Copyright (c) 2006 Itronix Inc.
* All rights reserved.
*
* Written by Iain Hibbert for Itronix Inc.
*
* 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: db.c,v 1.6 2020/06/07 00:12:00 thorpej Exp $");

#include <bluetooth.h>
#include <err.h>
#include <stdlib.h>
#include <stdbool.h>

#include <prop/proplib.h>

#include <dev/bluetooth/btdev.h>
#include <dev/bluetooth/bthidev.h>
#include <dev/bluetooth/btsco.h>

#include "btdevctl.h"

#define BTDEVCTL_PLIST          "/var/db/btdevctl.plist"
#define BTDEVCTL_VERSION        2

static prop_dictionary_t db = NULL;
static bool db_flush = true;            /* write db on set */

static void db_update0(void);
static void db_update1(void);

/*
* lookup laddr/raddr/service in database and return dictionary
*/
prop_dictionary_t
db_get(bdaddr_t *laddr, bdaddr_t *raddr, const char *service)
{
       prop_dictionary_t ldev, rdev, dev;
       prop_object_t obj;

       if (db == NULL) {
               db = prop_dictionary_internalize_from_file(BTDEVCTL_PLIST);
               if (db == NULL) {
                       db = prop_dictionary_create();
                       if (db == NULL)
                               err(EXIT_FAILURE, "prop_dictionary_create");

                       return NULL;
               } else {
                       obj = prop_dictionary_get(db, "btdevctl-version");
                       switch(prop_number_signed_value(obj)) {
                       case 0: db_update0();
                               /* FALLTHROUGH */
                       case 1: db_update1();
                               /* FALLTHROUGH */
                       case BTDEVCTL_VERSION:
                               break;

                       default:
                               errx(EXIT_FAILURE, "unknown btdevctl-version");
                       }
               }
       }

       ldev = prop_dictionary_get(db, bt_ntoa(laddr, NULL));
       if (prop_object_type(ldev) != PROP_TYPE_DICTIONARY)
               return NULL;

       rdev = prop_dictionary_get(ldev, bt_ntoa(raddr, NULL));
       if (prop_object_type(rdev) != PROP_TYPE_DICTIONARY)
               return NULL;

       dev = prop_dictionary_get(rdev, service);
       if (prop_object_type(dev) != PROP_TYPE_DICTIONARY)
               return NULL;

       return dev;
}

/*
* store dictionary in database at laddr/raddr/service
*/
int
db_set(prop_dictionary_t dev, bdaddr_t *laddr, bdaddr_t *raddr, const char *service)
{
       prop_dictionary_t ldev, rdev;

       ldev = prop_dictionary_get(db, bt_ntoa(laddr, NULL));
       if (ldev == NULL) {
               ldev = prop_dictionary_create();
               if (ldev == NULL)
                       return 0;

               if (!prop_dictionary_set(db, bt_ntoa(laddr, NULL), ldev))
                       return 0;

               prop_object_release(ldev);
       }

       rdev = prop_dictionary_get(ldev, bt_ntoa(raddr, NULL));
       if (rdev == NULL) {
               rdev = prop_dictionary_create();
               if (rdev == NULL)
                       return 0;

               if (!prop_dictionary_set(ldev, bt_ntoa(raddr, NULL), rdev))
                       return 0;

               prop_object_release(rdev);
       }

       if (!prop_dictionary_set(rdev, service, dev))
               return 0;

       if (db_flush == true) {
               if (!prop_dictionary_set_int(db, "btdevctl-version",
                                            BTDEVCTL_VERSION))
                       err(EXIT_FAILURE, "prop_dictionary_set_int");

               if (!prop_dictionary_externalize_to_file(db, BTDEVCTL_PLIST))
                       warn("%s", BTDEVCTL_PLIST);
       }

       return 1;
}

/*
* update database from version 0. This was a flat file using
* btdevN as an index, and local-bdaddr and remote-bdaddr stored
* as data objects. Step through and add them to the new dictionary.
* We have to generate the service, but only HID, HF and HSET
* were supported, so thats not too difficult.
*/
static void
db_update0(void)
{
       prop_dictionary_t old, dev;
       prop_dictionary_keysym_t key;
       prop_object_iterator_t iter;
       prop_object_t obj;
       bdaddr_t laddr, raddr;
       const char *service;

       db_flush = false;       /* no write on set */
       old = db;

       db = prop_dictionary_create();
       if (db == NULL)
               err(EXIT_FAILURE, "prop_dictionary_create");

       iter = prop_dictionary_iterator(old);
       if (iter == NULL)
               err(EXIT_FAILURE, "prop_dictionary_iterator");

       while ((key = prop_object_iterator_next(iter)) != NULL) {
               dev = prop_dictionary_get_keysym(old, key);
               if (prop_object_type(dev) != PROP_TYPE_DICTIONARY)
                       errx(EXIT_FAILURE, "invalid device dictionary");

               obj = prop_dictionary_get(dev, BTDEVladdr);
               if (prop_data_size(obj) != sizeof(laddr))
                       errx(EXIT_FAILURE, "invalid %s", BTDEVladdr);

               bdaddr_copy(&laddr, prop_data_value(obj));
               prop_dictionary_remove(dev, BTDEVladdr);

               obj = prop_dictionary_get(dev, BTDEVraddr);
               if (prop_data_size(obj) != sizeof(raddr))
                       errx(EXIT_FAILURE, "invalid %s", BTDEVraddr);

               bdaddr_copy(&raddr, prop_data_value(obj));
               prop_dictionary_remove(dev, BTDEVraddr);

               obj = prop_dictionary_get(dev, BTDEVtype);
               if (prop_string_equals_string(obj, "bthidev"))
                       service = "HID";
               else if (prop_string_equals_string(obj, "btsco")) {
                       obj = prop_dictionary_get(dev, BTSCOlisten);
                       if (prop_bool_true(obj))
                               service = "HF";
                       else
                               service = "HSET";
               } else
                       errx(EXIT_FAILURE, "invalid %s", BTDEVtype);

               if (!db_set(dev, &laddr, &raddr, service))
                       err(EXIT_FAILURE, "service store failed");
       }

       prop_object_iterator_release(iter);
       prop_object_release(old);

       db_flush = true;        /* write on set */
}

/*
* update database from version 1. Link Mode capability was added.
* By default, we request authentication for HIDs, and encryption
* is enabled for keyboards.
*/
static void
db_update1(void)
{
       prop_dictionary_t ldev, rdev, srv;
       prop_object_iterator_t iter0, iter1;
       prop_dictionary_keysym_t key;
       prop_object_t obj;
       bdaddr_t bdaddr;

       iter0 = prop_dictionary_iterator(db);
       if (iter0 == NULL)
               err(EXIT_FAILURE, "prop_dictionary_iterator");

       while ((key = prop_object_iterator_next(iter0)) != NULL) {
               ldev = prop_dictionary_get_keysym(db, key);
               if (prop_object_type(ldev) != PROP_TYPE_DICTIONARY
                   || !bt_aton(prop_dictionary_keysym_value(key), &bdaddr))
                       continue;

               iter1 = prop_dictionary_iterator(ldev);
               if (iter1 == NULL)
                       err(EXIT_FAILURE, "prop_dictionary_iterator");

               while ((key = prop_object_iterator_next(iter1)) != NULL) {
                       rdev = prop_dictionary_get_keysym(ldev, key);
                       if (prop_object_type(rdev) != PROP_TYPE_DICTIONARY
                           || !bt_aton(prop_dictionary_keysym_value(key), &bdaddr))
                               continue;

                       srv = prop_dictionary_get(rdev, "HID");
                       if (prop_object_type(srv) != PROP_TYPE_DICTIONARY)
                               continue;

                       obj = prop_dictionary_get(srv, BTHIDEVdescriptor);
                       if (prop_object_type(obj) != PROP_TYPE_DATA)
                               continue;

                       if (!prop_dictionary_set_string_nocopy(srv, BTDEVmode,
                                                              hid_mode(obj)))
                               err(EXIT_FAILURE, "Cannot set %s", BTDEVmode);
               }

               prop_object_iterator_release(iter1);
       }

       prop_object_iterator_release(iter0);
}

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