/*      $NetBSD: device.c,v 1.3 2009/02/09 12:44:32 plunky Exp $        */

/*-
* Copyright (c) 2007 Iain Hibbert
* 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 the author may not be used to endorse or promote products
*    derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 THE AUTHOR 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: device.c,v 1.3 2009/02/09 12:44:32 plunky Exp $");

#include <bluetooth.h>
#include <errno.h>
#include <stdbool.h>
#include <string.h>
#include <unistd.h>

#include "btkey.h"

/*
* read/write stored link keys packet, with space for one key
*/
struct stored_link_keys {
       uint8_t         num_keys;
       struct {
               bdaddr_t addr;
               uint8_t  key[HCI_KEY_SIZE];
       } key[1];
} __packed;

/*
* generic request
*
*      send command 'opcode' with command packet 'cptr' of size 'clen'
*      call 'func_cc' on command_complete event
*      call 'func_ev' on event 'event'
*      callbacks return -1 (failure), 0 (continue) or 1 (success)
*/
static bool
hci_req(uint16_t opcode, void *cptr, size_t clen, int (*func_cc)(void *),
       uint8_t event, int (*func_ev)(void *))
{
       uint8_t buf[sizeof(hci_cmd_hdr_t) + HCI_CMD_PKT_SIZE];
       struct sockaddr_bt sa;
       struct hci_filter f;
       hci_cmd_hdr_t *hdr;
       hci_event_hdr_t *ep;
       int fd, rv;

       memset(&f, 0, sizeof(f));
       hci_filter_set(HCI_EVENT_COMMAND_COMPL, &f);
       if (event != 0) hci_filter_set(event, &f);

       memset(&sa, 0, sizeof(sa));
       sa.bt_len = sizeof(sa);
       sa.bt_family = AF_BLUETOOTH;
       bdaddr_copy(&sa.bt_bdaddr, &laddr);

       hdr = (hci_cmd_hdr_t *)buf;
       hdr->type = HCI_CMD_PKT;
       hdr->opcode = htole16(opcode);
       hdr->length = clen;

       memcpy(buf + sizeof(hci_cmd_hdr_t), cptr, clen);

       rv = -1;

       if ((fd = socket(PF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI)) < 0
           || setsockopt(fd, BTPROTO_HCI, SO_HCI_EVT_FILTER, &f, sizeof(f)) < 0
           || bind(fd, (struct sockaddr *)&sa, sizeof(sa)) < 0
           || connect(fd, (struct sockaddr *)&sa, sizeof(sa)) < 0
           || send(fd, buf, sizeof(hci_cmd_hdr_t) + clen, 0) < 0)
               goto done;

       ep = (hci_event_hdr_t *)buf;
       for (;;) {
               if (recv(fd, buf, sizeof(buf), 0) < 0)
                       goto done;

               if (ep->event == HCI_EVENT_COMMAND_COMPL) {
                       hci_command_compl_ep *cc;

                       cc = (hci_command_compl_ep *)(ep + 1);
                       if (opcode != le16toh(cc->opcode))
                               continue;

                       rv = func_cc(cc + 1);
                       if (rv == 0)
                               continue;

                       goto done;
               }

               if (event != 0 && event == ep->event) {
                       rv = func_ev(ep + 1);
                       if (rv == 0)
                               continue;

                       goto done;
               }
       }

done:
       if (fd >= 0) close(fd);
       return rv > 0 ? true : false;
}

/*
* List keys on device
*/

static int
list_device_cc(void *arg)
{
       hci_read_stored_link_key_rp *rp = arg;

       if (rp->status) {
               errno = ENODEV;
               return -1;
       }

       printf("\n");
       printf("read %d keys (max %d)\n", rp->num_keys_read, rp->max_num_keys);

       return 1;
}

static int
list_device_ev(void *arg)
{
       struct stored_link_keys *ep = arg;
       int i;

       for (i = 0 ; i < ep->num_keys ; i++) {
               printf("\n");
               print_addr("bdaddr", &ep->key[i].addr);
               print_key("device key", ep->key[i].key);
       }

       return 0;
}

bool
list_device(void)
{
       hci_read_stored_link_key_cp cp;

       bdaddr_copy(&cp.bdaddr, BDADDR_ANY);
       cp.read_all = 0x01;

       return hci_req(HCI_CMD_READ_STORED_LINK_KEY,
                       &cp, sizeof(cp), list_device_cc,
                       HCI_EVENT_RETURN_LINK_KEYS, list_device_ev);
}

/*
* Read key from device
*/

static int
read_device_cc(void *arg)
{

       /* if we got here, no key was found */
       return -1;
}

static int
read_device_ev(void *arg)
{
       struct stored_link_keys *ep = arg;

       if (ep->num_keys != 1
           || !bdaddr_same(&ep->key[0].addr, &raddr))
               return 0;

       memcpy(key, ep->key[0].key, HCI_KEY_SIZE);
       return 1;
}

bool
read_device(void)
{
       hci_read_stored_link_key_cp cp;

       bdaddr_copy(&cp.bdaddr, &raddr);
       cp.read_all = 0x00;

       return hci_req(HCI_CMD_READ_STORED_LINK_KEY,
                       &cp, sizeof(cp), read_device_cc,
                       HCI_EVENT_RETURN_LINK_KEYS, read_device_ev);
}

/*
* Write key to device
*/
static int
write_device_cc(void *arg)
{
       hci_write_stored_link_key_rp *rp = arg;

       if (rp->status || rp->num_keys_written != 1) {
               errno = ENODEV;
               return -1;
       }

       return 1;
}

bool
write_device(void)
{
       struct stored_link_keys cp;

       cp.num_keys = 1;
       bdaddr_copy(&cp.key[0].addr, &raddr);
       memcpy(cp.key[0].key, key, HCI_KEY_SIZE);

       return hci_req(HCI_CMD_WRITE_STORED_LINK_KEY,
                       &cp, sizeof(cp), write_device_cc,
                       0, NULL);
}

/*
* Clear key from device
*/
static int
clear_device_cc(void *arg)
{
       hci_delete_stored_link_key_rp *rp = arg;

       if (rp->status || rp->num_keys_deleted != 1) {
               errno = ENODEV;
               return -1;
       }

       return 1;
}

bool
clear_device(void)
{
       hci_delete_stored_link_key_cp cp;

       cp.delete_all = 0x00;
       bdaddr_copy(&cp.bdaddr, &raddr);

       return hci_req(HCI_CMD_DELETE_STORED_LINK_KEY,
                       &cp, sizeof(cp), clear_device_cc,
                       0, NULL);
}

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