path: root/btif/src/btif_gatt_util.cc

/******************************************************************************
 *
 *  Copyright (C) 2009-2013 Broadcom Corporation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at:
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 ******************************************************************************/

#define LOG_TAG "bt_btif_gatt"

#include "btif_gatt_util.h"

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <hardware/bluetooth.h>
#include <hardware/bt_gatt.h>

#include "bt_common.h"
#include "bta_api.h"
#include "bta_gatt_api.h"
#include "bta_jv_api.h"
#include "btif_common.h"
#include "btif_config.h"
#include "btif_dm.h"
#include "btif_gatt.h"
#include "btif_storage.h"
#include "btif_util.h"
#include "osi/include/osi.h"

#define GATTC_READ_VALUE_TYPE_VALUE 0x0000 /* Attribute value itself */
#define GATTC_READ_VALUE_TYPE_AGG_FORMAT \
  0x2905 /* Characteristic Aggregate Format*/

static unsigned char BASE_UUID[16] = {0xfb, 0x34, 0x9b, 0x5f, 0x80, 0x00,
                                      0x00, 0x80, 0x00, 0x10, 0x00, 0x00,
                                      0x00, 0x00, 0x00, 0x00};

int uuidType(const unsigned char* p_uuid) {
  int i = 0;
  int match = 0;
  int all_zero = 1;

  for (i = 0; i != 16; ++i) {
    if (i == 12 || i == 13) continue;

    if (p_uuid[i] == BASE_UUID[i]) ++match;

    if (p_uuid[i] != 0) all_zero = 0;
  }
  if (all_zero) return 0;
  if (match == 12) return LEN_UUID_32;
  if (match == 14) return LEN_UUID_16;
  return LEN_UUID_128;
}

/*******************************************************************************
 * BTIF -> BTA conversion functions
 ******************************************************************************/

void btif_to_bta_uuid(tBT_UUID* p_dest, const bt_uuid_t* p_src) {
  char* p_byte = (char*)p_src;
  int i = 0;

  p_dest->len = uuidType(p_src->uu);

  switch (p_dest->len) {
    case LEN_UUID_16:
      p_dest->uu.uuid16 = (p_src->uu[13] << 8) + p_src->uu[12];
      break;

    case LEN_UUID_32:
      p_dest->uu.uuid32 = (p_src->uu[13] << 8) + p_src->uu[12];
      p_dest->uu.uuid32 += (p_src->uu[15] << 24) + (p_src->uu[14] << 16);
      break;

    case LEN_UUID_128:
      for (i = 0; i != 16; ++i) p_dest->uu.uuid128[i] = p_byte[i];
      break;

    default:
      LOG_ERROR(LOG_TAG, "%s: Unknown UUID length %d!", __func__, p_dest->len);
      break;
  }
}

void btif_to_bta_response(tBTA_GATTS_RSP* p_dest, btgatt_response_t* p_src) {
  p_dest->attr_value.auth_req = p_src->attr_value.auth_req;
  p_dest->attr_value.handle = p_src->attr_value.handle;
  p_dest->attr_value.len = p_src->attr_value.len;
  p_dest->attr_value.offset = p_src->attr_value.offset;
  memcpy(p_dest->attr_value.value, p_src->attr_value.value, GATT_MAX_ATTR_LEN);
}

void btif_to_bta_uuid_mask(tBTM_BLE_PF_COND_MASK* p_mask,
                           const bt_uuid_t* uuid_mask,
                           const bt_uuid_t* svc_uuid) {
  char* p_byte = (char*)uuid_mask;
  int uuid_len = uuidType(svc_uuid->uu);
  int i = 0;

  switch (uuid_len) {
    case LEN_UUID_16:
      p_mask->uuid16_mask = (uuid_mask->uu[13] << 8) + uuid_mask->uu[12];
      break;

    case LEN_UUID_32:
      p_mask->uuid32_mask = (uuid_mask->uu[13] << 8) + uuid_mask->uu[12];
      p_mask->uuid32_mask +=
          (uuid_mask->uu[15] << 24) + (uuid_mask->uu[14] << 16);
      break;

    case LEN_UUID_128:
      for (i = 0; i != 16; ++i) p_mask->uuid128_mask[i] = p_byte[i];
      break;

    default:
      break;
  }
}

/*******************************************************************************
 * BTA -> BTIF conversion functions
 ******************************************************************************/

void bta_to_btif_uuid(bt_uuid_t* p_dest, tBT_UUID* p_src) {
  int i = 0;

  if (p_src->len == LEN_UUID_16 || p_src->len == LEN_UUID_32) {
    for (i = 0; i != 16; ++i) p_dest->uu[i] = BASE_UUID[i];
  }

  switch (p_src->len) {
    case 0:
      break;

    case LEN_UUID_16:
      p_dest->uu[12] = p_src->uu.uuid16 & 0xff;
      p_dest->uu[13] = (p_src->uu.uuid16 >> 8) & 0xff;
      break;

    case LEN_UUID_32:
      p_dest->uu[12] = p_src->uu.uuid16 & 0xff;
      p_dest->uu[13] = (p_src->uu.uuid16 >> 8) & 0xff;
      p_dest->uu[14] = (p_src->uu.uuid32 >> 16) & 0xff;
      p_dest->uu[15] = (p_src->uu.uuid32 >> 24) & 0xff;
      break;

    case LEN_UUID_128:
      for (i = 0; i != 16; ++i) p_dest->uu[i] = p_src->uu.uuid128[i];
      break;

    default:
      LOG_ERROR(LOG_TAG, "%s: Unknown UUID length %d!", __func__, p_src->len);
      break;
  }
}

/*******************************************************************************
 * Utility functions
 ******************************************************************************/

uint16_t get_uuid16(tBT_UUID* p_uuid) {
  if (p_uuid->len == LEN_UUID_16) {
    return p_uuid->uu.uuid16;
  } else if (p_uuid->len == LEN_UUID_128) {
    uint16_t u16;
    uint8_t* p = &p_uuid->uu.uuid128[LEN_UUID_128 - 4];
    STREAM_TO_UINT16(u16, p);
    return u16;
  } else /* p_uuid->len == LEN_UUID_32 */
  {
    return (uint16_t)p_uuid->uu.uuid32;
  }
}

uint16_t set_read_value(btgatt_read_params_t* p_dest, tBTA_GATTC_READ* p_src) {
  uint16_t len = 0;

  p_dest->status = p_src->status;
  p_dest->handle = p_src->handle;

  if ((p_src->status == BTA_GATT_OK) && (p_src->len != 0)) {
    LOG_INFO(LOG_TAG, "%s len = %d ", __func__, p_src->len);
    p_dest->value.len = p_src->len;
    memcpy(p_dest->value.value, p_src->value, p_src->len);

    len += p_src->len;
  } else {
    p_dest->value.len = 0;
  }

  p_dest->value_type = GATTC_READ_VALUE_TYPE_VALUE;
  return len;
}

/*******************************************************************************
 * Encrypted link map handling
 ******************************************************************************/

#if (BLE_DELAY_REQUEST_ENC == FALSE)
static bool btif_gatt_is_link_encrypted(const RawAddress& bd_addr) {
  return BTA_JvIsEncrypted(bd_addr);
}

static void btif_gatt_set_encryption_cb(UNUSED_ATTR const RawAddress& bd_addr,
                                        UNUSED_ATTR tBTA_TRANSPORT transport,
                                        tBTA_STATUS result) {
  if (result != BTA_SUCCESS && result != BTA_BUSY) {
    BTIF_TRACE_WARNING("%s() - Encryption failed (%d)", __func__, result);
  }
}
#endif

#if (BLE_DELAY_REQUEST_ENC == FALSE)
void btif_gatt_check_encrypted_link(RawAddress bd_addr,
                                    tBTA_GATT_TRANSPORT transport_link) {
  char buf[100];

  if ((btif_storage_get_ble_bonding_key(&bd_addr, BTIF_DM_LE_KEY_PENC, buf,
                                        sizeof(tBTM_LE_PENC_KEYS)) ==
       BT_STATUS_SUCCESS) &&
      !btif_gatt_is_link_encrypted(bd_addr)) {
    BTIF_TRACE_DEBUG("%s: transport = %d", __func__, transport_link);
    BTA_DmSetEncryption(bd_addr, transport_link, &btif_gatt_set_encryption_cb,
                        BTM_BLE_SEC_ENCRYPT);
  }
}
#else
void btif_gatt_check_encrypted_link(UNUSED_ATTR RawAddress bd_addr,
                                    UNUSED_ATTR tBTA_GATT_TRANSPORT
                                        transport_link) {}
#endif

void btif_gatt_move_track_adv_data(btgatt_track_adv_info_t* p_dest,
                                   btgatt_track_adv_info_t* p_src) {
  memset(p_dest, 0, sizeof(btgatt_track_adv_info_t));

  memcpy(p_dest, p_src, sizeof(btgatt_track_adv_info_t));

  if (p_src->adv_pkt_len > 0) {
    p_dest->p_adv_pkt_data = (uint8_t*)osi_malloc(p_src->adv_pkt_len);
    memcpy(p_dest->p_adv_pkt_data, p_src->p_adv_pkt_data, p_src->adv_pkt_len);
    osi_free_and_reset((void**)&p_src->p_adv_pkt_data);
  }

  if (p_src->scan_rsp_len > 0) {
    p_dest->p_scan_rsp_data = (uint8_t*)osi_malloc(p_src->scan_rsp_len);
    memcpy(p_dest->p_scan_rsp_data, p_src->p_scan_rsp_data,
           p_src->scan_rsp_len);
    osi_free_and_reset((void**)&p_src->p_scan_rsp_data);
  }
}