/******************************************************************************
*
* Copyright 2009-2012 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.
*
******************************************************************************/
/******************************************************************************
*
* this file contains GATT database building and query functions
*
******************************************************************************/
#include "bt_target.h"
#include "bt_trace.h"
#include "bt_utils.h"
#include <stdio.h>
#include <string.h>
#include "btm_int.h"
#include "gatt_int.h"
#include "l2c_api.h"
#include "osi/include/osi.h"
using base::StringPrintf;
using bluetooth::Uuid;
/*******************************************************************************
* L O C A L F U N C T I O N P R O T O T Y P E S *
******************************************************************************/
static tGATT_ATTR& allocate_attr_in_db(tGATT_SVC_DB& db, const Uuid& uuid,
tGATT_PERM perm);
static tGATT_STATUS gatts_send_app_read_request(
tGATT_TCB& tcb, uint8_t op_code, uint16_t handle, uint16_t offset,
uint32_t trans_id, bt_gatt_db_attribute_type_t gatt_type);
/**
* Initialize a memory space to be a service database.
*/
void gatts_init_service_db(tGATT_SVC_DB& db, const Uuid& service_uuid,
bool is_pri, uint16_t s_hdl, uint16_t num_handle) {
db.attr_list.reserve(num_handle);
VLOG(1) << StringPrintf("%s: s_hdl= %d num_handle= %d", __func__, s_hdl,
num_handle);
/* update service database information */
db.next_handle = s_hdl;
db.end_handle = s_hdl + num_handle;
/* add service declration record */
Uuid uuid =
Uuid::From16Bit(is_pri ? GATT_UUID_PRI_SERVICE : GATT_UUID_SEC_SERVICE);
tGATT_ATTR& attr = allocate_attr_in_db(db, uuid, GATT_PERM_READ);
attr.p_value.reset((tGATT_ATTR_VALUE*)(new Uuid));
attr.p_value->uuid = service_uuid;
}
Uuid* gatts_get_service_uuid(tGATT_SVC_DB* p_db) {
if (!p_db || p_db->attr_list.empty()) {
LOG(ERROR) << "service DB empty";
return NULL;
} else {
return &p_db->attr_list[0].p_value->uuid;
}
}
/** Check attribute readability. Returns status of operation. */
static tGATT_STATUS gatts_check_attr_readability(const tGATT_ATTR& attr,
UNUSED_ATTR uint16_t offset,
bool read_long,
tGATT_SEC_FLAG sec_flag,
uint8_t key_size) {
uint16_t min_key_size;
tGATT_PERM perm = attr.permission;
min_key_size = (((perm & GATT_ENCRYPT_KEY_SIZE_MASK) >> 12));
if (min_key_size != 0) {
min_key_size += 6;
}
if (!(perm & GATT_READ_ALLOWED)) {
LOG(ERROR) << __func__ << ": GATT_READ_NOT_PERMIT";
return GATT_READ_NOT_PERMIT;
}
if ((perm & GATT_READ_AUTH_REQUIRED) &&
!(sec_flag & GATT_SEC_FLAG_LKEY_UNAUTHED) &&
!(sec_flag & BTM_SEC_FLAG_ENCRYPTED)) {
LOG(ERROR) << __func__ << ": GATT_INSUF_AUTHENTICATION";
return GATT_INSUF_AUTHENTICATION;
}
if ((perm & GATT_READ_MITM_REQUIRED) &&
!(sec_flag & GATT_SEC_FLAG_LKEY_AUTHED)) {
LOG(ERROR) << __func__ << ": GATT_INSUF_AUTHENTICATION: MITM Required";
return GATT_INSUF_AUTHENTICATION;
}
if ((perm & GATT_READ_ENCRYPTED_REQUIRED) &&
!(sec_flag & GATT_SEC_FLAG_ENCRYPTED)) {
LOG(ERROR) << __func__ << ": GATT_INSUF_ENCRYPTION";
return GATT_INSUF_ENCRYPTION;
}
if ((perm & GATT_READ_ENCRYPTED_REQUIRED) &&
(sec_flag & GATT_SEC_FLAG_ENCRYPTED) && (key_size < min_key_size)) {
LOG(ERROR) << __func__ << ": GATT_INSUF_KEY_SIZE";
return GATT_INSUF_KEY_SIZE;
}
if (read_long && attr.uuid.Is16Bit()) {
switch (attr.uuid.As16Bit()) {
case GATT_UUID_PRI_SERVICE:
case GATT_UUID_SEC_SERVICE:
case GATT_UUID_CHAR_DECLARE:
case GATT_UUID_INCLUDE_SERVICE:
case GATT_UUID_CHAR_EXT_PROP:
case GATT_UUID_CHAR_CLIENT_CONFIG:
case GATT_UUID_CHAR_SRVR_CONFIG:
case GATT_UUID_CHAR_PRESENT_FORMAT:
LOG(ERROR) << __func__ << ": GATT_NOT_LONG";
return GATT_NOT_LONG;
default:
break;
}
}
return GATT_SUCCESS;
}
/*******************************************************************************
*
* Function read_attr_value
*
* Description Utility function to read an attribute value.
*
* Parameter attr16: pointer to the attribute to read.
* offset: read offset.
* p_data: output parameter to carry out the attribute value.
* read_long: this is a read blob request.
* mtu: MTU
* p_len: output parameter to carry out the attribute length.
* sec_flag: current link security status.
* key_size: encryption key size.
*
* Returns status of operation.
*
******************************************************************************/
static tGATT_STATUS read_attr_value(tGATT_ATTR& attr16, uint16_t offset,
uint8_t** p_data, bool read_long,
uint16_t mtu, uint16_t* p_len,
tGATT_SEC_FLAG sec_flag, uint8_t key_size) {
uint8_t* p = *p_data;
VLOG(1) << __func__ << " uuid=" << attr16.uuid
<< StringPrintf(" perm=0x%02x sec_flag=0x%x offset=%d read_long=%d",
attr16.permission, sec_flag, offset, read_long);
tGATT_STATUS status = gatts_check_attr_readability(attr16, offset, read_long,
sec_flag, key_size);
if (status != GATT_SUCCESS) return status;
if (!attr16.uuid.Is16Bit()) {
/* characteristic description or characteristic value */
return GATT_PENDING;
}
uint16_t uuid16 = attr16.uuid.As16Bit();
if (uuid16 == GATT_UUID_PRI_SERVICE || uuid16 == GATT_UUID_SEC_SERVICE) {
*p_len = gatt_build_uuid_to_stream_len(attr16.p_value->uuid);
if (mtu < *p_len) return GATT_NO_RESOURCES;
gatt_build_uuid_to_stream(&p, attr16.p_value->uuid);
*p_data = p;
return GATT_SUCCESS;
}
if (uuid16 == GATT_UUID_CHAR_DECLARE) {
tGATT_ATTR* val_attr = &attr16 + 1;
uint8_t val_len = val_attr->uuid.GetShortestRepresentationSize();
*p_len = (val_len == Uuid::kNumBytes16) ? 5 : 19;
if (mtu < *p_len) return GATT_NO_RESOURCES;
UINT8_TO_STREAM(p, attr16.p_value->char_decl.property);
UINT16_TO_STREAM(p, attr16.p_value->char_decl.char_val_handle);
if (val_len == Uuid::kNumBytes16) {
UINT16_TO_STREAM(p, val_attr->uuid.As16Bit());
} else {
/* if 32 bit UUID, convert to 128 bit */
ARRAY_TO_STREAM(p, val_attr->uuid.To128BitLE(), (int)Uuid::kNumBytes128);
}
*p_data = p;
return GATT_SUCCESS;
}
if (uuid16 == GATT_UUID_INCLUDE_SERVICE) {
tGATT_INCL_SRVC& incl_handle = attr16.p_value->incl_handle;
if (incl_handle.service_type.Is16Bit())
*p_len = 6;
else
*p_len = 4;
if (mtu < *p_len) return GATT_NO_RESOURCES;
UINT16_TO_STREAM(p, incl_handle.s_handle);
UINT16_TO_STREAM(p, incl_handle.e_handle);
if (incl_handle.service_type.Is16Bit()) {
UINT16_TO_STREAM(p, incl_handle.service_type.As16Bit());
}
*p_data = p;
return GATT_SUCCESS;
}
/* characteristic description or characteristic value (again) */
return GATT_PENDING;
}
/*******************************************************************************
*
* Function gatts_db_read_attr_value_by_type
*
* Description Query attribute value by attribute type.
*
* Parameter p_db: pointer to the attribute database.
* p_rsp: Read By type response data.
* s_handle: starting handle of the range we are looking for.
* e_handle: ending handle of the range we are looking for.
* type: Attribute type.
* mtu: MTU.
* sec_flag: current link security status.
* key_size: encryption key size.
*
* Returns Status of the operation.
*
******************************************************************************/
tGATT_STATUS gatts_db_read_attr_value_by_type(
tGATT_TCB& tcb, tGATT_SVC_DB* p_db, uint8_t op_code, BT_HDR* p_rsp,
uint16_t s_handle, uint16_t e_handle, const Uuid& type, uint16_t* p_len,
tGATT_SEC_FLAG sec_flag, uint8_t key_size, uint32_t trans_id,
uint16_t* p_cur_handle) {
tGATT_STATUS status = GATT_NOT_FOUND;
uint16_t len = 0;
uint8_t* p = (uint8_t*)(p_rsp + 1) + p_rsp->len + L2CAP_MIN_OFFSET;
if (p_db) {
for (tGATT_ATTR& attr : p_db->attr_list) {
if (attr.handle >= s_handle && type == attr.uuid) {
if (*p_len <= 2) {
status = GATT_NO_RESOURCES;
break;
}
UINT16_TO_STREAM(p, attr.handle);
status = read_attr_value(attr, 0, &p, false, (uint16_t)(*p_len - 2),
&len, sec_flag, key_size);
if (status == GATT_PENDING) {
status = gatts_send_app_read_request(tcb, op_code, attr.handle, 0,
trans_id, attr.gatt_type);
/* one callback at a time */
break;
} else if (status == GATT_SUCCESS) {
if (p_rsp->offset == 0) p_rsp->offset = len + 2;
if (p_rsp->offset == len + 2) {
p_rsp->len += (len + 2);
*p_len -= (len + 2);
} else {
LOG(ERROR) << "format mismatch";
status = GATT_NO_RESOURCES;
break;
}
} else {
*p_cur_handle = attr.handle;
break;
}
}
}
}
#if (BLE_DELAY_REQUEST_ENC == TRUE)
uint8_t flag = 0;
if (BTM_GetSecurityFlags(tcb.peer_bda, &flag)) {
if ((tcb.att_lcid == L2CAP_ATT_CID) && (status == GATT_PENDING) &&
(type.As16Bit() == GATT_UUID_GAP_DEVICE_NAME)) {
if ((flag & (BTM_SEC_LINK_KEY_KNOWN | BTM_SEC_FLAG_ENCRYPTED)) ==
BTM_SEC_LINK_KEY_KNOWN) {
tACL_CONN* p = btm_bda_to_acl(tcb.peer_bda, BT_TRANSPORT_LE);
if ((p != NULL) && (p->link_role == BTM_ROLE_MASTER))
btm_ble_set_encryption(tcb.peer_bda, BTM_BLE_SEC_ENCRYPT,
p->link_role);
}
}
}
#endif
return status;
}
/**
* This function adds an included service into a database.
*
* Parameter db: database pointer.
* inc_srvc_type: included service type.
*
* Returns Status of the operation.
*
*/
uint16_t gatts_add_included_service(tGATT_SVC_DB& db, uint16_t s_handle,
uint16_t e_handle, const Uuid& service) {
Uuid uuid = Uuid::From16Bit(GATT_UUID_INCLUDE_SERVICE);
VLOG(1) << __func__
<< StringPrintf(": s_hdl=0x%04x e_hdl=0x%04x ", s_handle, e_handle)
<< "service uuid = " << service;
if (service.IsEmpty() || s_handle == 0 || e_handle == 0) {
LOG(ERROR) << __func__ << ": Illegal Params.";
return 0;
}
tGATT_ATTR& attr = allocate_attr_in_db(db, uuid, GATT_PERM_READ);
attr.p_value.reset((tGATT_ATTR_VALUE*)(new tGATT_INCL_SRVC));
attr.p_value->incl_handle.s_handle = s_handle;
attr.p_value->incl_handle.e_handle = e_handle;
attr.p_value->incl_handle.service_type = service;
return attr.handle;
}
/*******************************************************************************
*
* Function gatts_add_characteristic
*
* Description This function add a characteristics and its descriptor into
* a servce identified by the service database pointer.
*
* Parameter db: database.
* perm: permission (authentication and key size requirements)
* property: property of the characteristic.
* p_char: characteristic value information.
*
* Returns Status of te operation.
*
******************************************************************************/
uint16_t gatts_add_characteristic(tGATT_SVC_DB& db, tGATT_PERM perm,
tGATT_CHAR_PROP property,
const Uuid& char_uuid) {
Uuid uuid = Uuid::From16Bit(GATT_UUID_CHAR_DECLARE);
VLOG(1) << StringPrintf("%s: perm=0x%0x property=0x%0x", __func__, perm,
property);
tGATT_ATTR& char_decl = allocate_attr_in_db(db, uuid, GATT_PERM_READ);
tGATT_ATTR& char_val = allocate_attr_in_db(db, char_uuid, perm);
char_decl.p_value.reset((tGATT_ATTR_VALUE*)(new tGATT_CHAR_DECL));
char_decl.p_value->char_decl.property = property;
char_decl.p_value->char_decl.char_val_handle = char_val.handle;
char_val.gatt_type = BTGATT_DB_CHARACTERISTIC;
return char_val.handle;
}
/*******************************************************************************
*
* Function gatts_add_char_descr
*
* Description This function add a characteristics descriptor.
*
* Parameter p_db: database pointer.
* perm: characteristic descriptor permission type.
* char_dscp_tpye: the characteristic descriptor masks.
* p_dscp_params: characteristic descriptors values.
*
* Returns Status of the operation.
*
******************************************************************************/
uint16_t gatts_add_char_descr(tGATT_SVC_DB& db, tGATT_PERM perm,
const Uuid& descr_uuid) {
VLOG(1) << StringPrintf("gatts_add_char_descr uuid=%s",
descr_uuid.ToString().c_str());
/* Add characteristic descriptors */
tGATT_ATTR& char_dscptr = allocate_attr_in_db(db, descr_uuid, perm);
char_dscptr.gatt_type = BTGATT_DB_DESCRIPTOR;
return char_dscptr.handle;
}
/******************************************************************************/
/* Service Attribute Database Query Utility Functions */
/******************************************************************************/
tGATT_ATTR* find_attr_by_handle(tGATT_SVC_DB* p_db, uint16_t handle) {
if (!p_db) return nullptr;
for (auto& attr : p_db->attr_list) {
if (attr.handle == handle) return &attr;
if (attr.handle > handle) return nullptr;
}
return nullptr;
}
/*******************************************************************************
*
* Function gatts_read_attr_value_by_handle
*
* Description Query attribute value by attribute handle.
*
* Parameter p_db: pointer to the attribute database.
* handle: Attribute handle to read.
* offset: Read offset.
* p_value: output parameter to carry out the attribute value.
* p_len: output parameter as attribute length read.
* read_long: this is a read blob request.
* mtu: MTU.
* sec_flag: current link security status.
* key_size: encryption key size
*
* Returns Status of operation.
*
******************************************************************************/
tGATT_STATUS gatts_read_attr_value_by_handle(
tGATT_TCB& tcb, tGATT_SVC_DB* p_db, uint8_t op_code, uint16_t handle,
uint16_t offset, uint8_t* p_value, uint16_t* p_len, uint16_t mtu,
tGATT_SEC_FLAG sec_flag, uint8_t key_size, uint32_t trans_id) {
tGATT_ATTR* p_attr = find_attr_by_handle(p_db, handle);
if (!p_attr) return GATT_NOT_FOUND;
uint8_t* pp = p_value;
tGATT_STATUS status = read_attr_value(*p_attr, offset, &pp,
(bool)(op_code == GATT_REQ_READ_BLOB),
mtu, p_len, sec_flag, key_size);
if (status == GATT_PENDING) {
status = gatts_send_app_read_request(tcb, op_code, p_attr->handle, offset,
trans_id, p_attr->gatt_type);
}
return status;
}
/*******************************************************************************
*
* Function gatts_read_attr_perm_check
*
* Description Check attribute readability.
*
* Parameter p_db: pointer to the attribute database.
* handle: Attribute handle to read.
* offset: Read offset.
* p_value: output parameter to carry out the attribute value.
* p_len: output parameter as attribute length read.
* read_long: this is a read blob request.
* mtu: MTU.
* sec_flag: current link security status.
* key_size: encryption key size
*
* Returns Status of operation.
*
******************************************************************************/
tGATT_STATUS gatts_read_attr_perm_check(tGATT_SVC_DB* p_db, bool is_long,
uint16_t handle,
tGATT_SEC_FLAG sec_flag,
uint8_t key_size) {
tGATT_ATTR* p_attr = find_attr_by_handle(p_db, handle);
if (!p_attr) return GATT_NOT_FOUND;
return gatts_check_attr_readability(*p_attr, 0, is_long, sec_flag, key_size);
}
/*******************************************************************************
*
* Function gatts_write_attr_perm_check
*
* Description Write attribute value into database.
*
* Parameter p_db: pointer to the attribute database.
* op_code:op code of this write.
* handle: handle of the attribute to write.
* offset: Write offset if write op code is write blob.
* p_data: Attribute value to write.
* len: attribute data length.
* sec_flag: current link security status.
* key_size: encryption key size
*
* Returns Status of the operation.
*
******************************************************************************/
tGATT_STATUS gatts_write_attr_perm_check(tGATT_SVC_DB* p_db, uint8_t op_code,
uint16_t handle, uint16_t offset,
uint8_t* p_data, uint16_t len,
tGATT_SEC_FLAG sec_flag,
uint8_t key_size) {
VLOG(1) << StringPrintf(
"%s: op_code=0x%0x handle=0x%04x offset=%d len=%d sec_flag=0x%0x "
"key_size=%d",
__func__, op_code, handle, offset, len, sec_flag, key_size);
tGATT_ATTR* p_attr = find_attr_by_handle(p_db, handle);
if (!p_attr) return GATT_NOT_FOUND;
tGATT_PERM perm = p_attr->permission;
uint16_t min_key_size = (((perm & GATT_ENCRYPT_KEY_SIZE_MASK) >> 12));
if (min_key_size != 0) {
min_key_size += 6;
}
VLOG(1) << StringPrintf("%s: p_attr->permission =0x%04x min_key_size==0x%04x",
__func__, p_attr->permission, min_key_size);
if ((op_code == GATT_CMD_WRITE || op_code == GATT_REQ_WRITE) &&
(perm & GATT_WRITE_SIGNED_PERM)) {
/* use the rules for the mixed security see section 10.2.3*/
/* use security mode 1 level 2 when the following condition follows */
/* LE security mode 2 level 1 and LE security mode 1 level 2 */
if ((perm & GATT_PERM_WRITE_SIGNED) && (perm & GATT_PERM_WRITE_ENCRYPTED)) {
perm = GATT_PERM_WRITE_ENCRYPTED;
}
/* use security mode 1 level 3 when the following condition follows */
/* LE security mode 2 level 2 and security mode 1 and LE */
else if (((perm & GATT_PERM_WRITE_SIGNED_MITM) &&
(perm & GATT_PERM_WRITE_ENCRYPTED)) ||
/* LE security mode 2 and security mode 1 level 3 */
((perm & GATT_WRITE_SIGNED_PERM) &&
(perm & GATT_PERM_WRITE_ENC_MITM))) {
perm = GATT_PERM_WRITE_ENC_MITM;
}
}
tGATT_STATUS status = GATT_NOT_FOUND;
if ((op_code == GATT_SIGN_CMD_WRITE) && !(perm & GATT_WRITE_SIGNED_PERM)) {
status = GATT_WRITE_NOT_PERMIT;
VLOG(1) << __func__ << ": sign cmd write not allowed";
}
if ((op_code == GATT_SIGN_CMD_WRITE) &&
(sec_flag & GATT_SEC_FLAG_ENCRYPTED)) {
status = GATT_INVALID_PDU;
LOG(ERROR) << __func__
<< ": Error!! sign cmd write sent on a encypted link";
} else if (!(perm & GATT_WRITE_ALLOWED)) {
status = GATT_WRITE_NOT_PERMIT;
LOG(ERROR) << __func__ << ": GATT_WRITE_NOT_PERMIT";
}
/* require authentication, but not been authenticated */
else if ((perm & GATT_WRITE_AUTH_REQUIRED) &&
!(sec_flag & GATT_SEC_FLAG_LKEY_UNAUTHED)) {
status = GATT_INSUF_AUTHENTICATION;
LOG(ERROR) << __func__ << ": GATT_INSUF_AUTHENTICATION";
} else if ((perm & GATT_WRITE_MITM_REQUIRED) &&
!(sec_flag & GATT_SEC_FLAG_LKEY_AUTHED)) {
status = GATT_INSUF_AUTHENTICATION;
LOG(ERROR) << __func__ << ": GATT_INSUF_AUTHENTICATION: MITM required";
} else if ((perm & GATT_WRITE_ENCRYPTED_PERM) &&
!(sec_flag & GATT_SEC_FLAG_ENCRYPTED)) {
status = GATT_INSUF_ENCRYPTION;
LOG(ERROR) << __func__ << ": GATT_INSUF_ENCRYPTION";
} else if ((perm & GATT_WRITE_ENCRYPTED_PERM) &&
(sec_flag & GATT_SEC_FLAG_ENCRYPTED) &&
(key_size < min_key_size)) {
status = GATT_INSUF_KEY_SIZE;
LOG(ERROR) << __func__ << ": GATT_INSUF_KEY_SIZE";
}
/* LE security mode 2 attribute */
else if (perm & GATT_WRITE_SIGNED_PERM && op_code != GATT_SIGN_CMD_WRITE &&
!(sec_flag & GATT_SEC_FLAG_ENCRYPTED) &&
(perm & GATT_WRITE_ALLOWED) == 0) {
status = GATT_INSUF_AUTHENTICATION;
LOG(ERROR) << __func__
<< ": GATT_INSUF_AUTHENTICATION: LE security mode 2 required";
} else /* writable: must be char value declaration or char descritpors */
{
uint16_t max_size = 0;
if (p_attr->uuid.IsEmpty()) {
status = GATT_INVALID_PDU;
} else if (p_attr->uuid.Is16Bit()) {
switch (p_attr->uuid.As16Bit()) {
case GATT_UUID_CHAR_PRESENT_FORMAT: /* should be readable only */
case GATT_UUID_CHAR_EXT_PROP: /* should be readable only */
case GATT_UUID_CHAR_AGG_FORMAT: /* should be readable only */
case GATT_UUID_CHAR_VALID_RANGE:
status = GATT_WRITE_NOT_PERMIT;
break;
case GATT_UUID_CHAR_CLIENT_CONFIG:
FALLTHROUGH_INTENDED; /* FALLTHROUGH */
case GATT_UUID_CHAR_SRVR_CONFIG:
max_size = 2;
FALLTHROUGH_INTENDED; /* FALLTHROUGH */
case GATT_UUID_CHAR_DESCRIPTION:
default: /* any other must be character value declaration */
status = GATT_SUCCESS;
break;
}
} else { // 32 or 128 bit UUID
status = GATT_SUCCESS;
}
if (p_data == NULL && len > 0) {
return GATT_INVALID_PDU;
}
/* these attribute does not allow write blob */
if (p_attr->uuid.Is16Bit() &&
(p_attr->uuid.As16Bit() == GATT_UUID_CHAR_CLIENT_CONFIG ||
p_attr->uuid.As16Bit() == GATT_UUID_CHAR_SRVR_CONFIG)) {
if (op_code == GATT_REQ_PREPARE_WRITE && offset != 0) {
/* does not allow write blob */
status = GATT_NOT_LONG;
LOG(ERROR) << __func__ << ": GATT_NOT_LONG";
} else if (len != max_size) {
/* data does not match the required format */
status = GATT_INVALID_ATTR_LEN;
LOG(ERROR) << __func__ << ": GATT_INVALID_PDU";
} else {
return GATT_SUCCESS;
}
}
}
return status;
}
/**
* Description Allocate a memory space for a new attribute, and link this
* attribute into the database attribute list.
*
*
* Parameter p_db : database pointer.
* uuid: attribute UUID
*
* Returns pointer to the newly allocated attribute.
*
*/
static tGATT_ATTR& allocate_attr_in_db(tGATT_SVC_DB& db, const Uuid& uuid,
tGATT_PERM perm) {
if (db.next_handle >= db.end_handle) {
LOG(FATAL) << __func__
<< " wrong number of handles! handle_max = " << +db.end_handle
<< ", next_handle = " << +db.next_handle;
}
db.attr_list.emplace_back();
tGATT_ATTR& attr = db.attr_list.back();
attr.handle = db.next_handle++;
attr.uuid = uuid;
attr.permission = perm;
return attr;
}
/*******************************************************************************
*
* Function gatts_send_app_read_request
*
* Description Send application read request callback
*
* Returns status of operation.
*
******************************************************************************/
static tGATT_STATUS gatts_send_app_read_request(
tGATT_TCB& tcb, uint8_t op_code, uint16_t handle, uint16_t offset,
uint32_t trans_id, bt_gatt_db_attribute_type_t gatt_type) {
tGATT_SRV_LIST_ELEM& el = *gatt_sr_find_i_rcb_by_handle(handle);
uint16_t conn_id = GATT_CREATE_CONN_ID(tcb.tcb_idx, el.gatt_if);
if (trans_id == 0) {
trans_id = gatt_sr_enqueue_cmd(tcb, op_code, handle);
gatt_sr_update_cback_cnt(tcb, el.gatt_if, true, true);
}
if (trans_id != 0) {
tGATTS_DATA sr_data;
memset(&sr_data, 0, sizeof(tGATTS_DATA));
sr_data.read_req.handle = handle;
sr_data.read_req.is_long = (bool)(op_code == GATT_REQ_READ_BLOB);
sr_data.read_req.offset = offset;
uint8_t opcode;
if (gatt_type == BTGATT_DB_DESCRIPTOR) {
opcode = GATTS_REQ_TYPE_READ_DESCRIPTOR;
} else if (gatt_type == BTGATT_DB_CHARACTERISTIC) {
opcode = GATTS_REQ_TYPE_READ_CHARACTERISTIC;
} else {
LOG(ERROR) << __func__
<< ": Attempt to read attribute that's not tied with "
"characteristic or descriptor value.";
return GATT_ERROR;
}
gatt_sr_send_req_callback(conn_id, trans_id, opcode, &sr_data);
return (tGATT_STATUS)GATT_PENDING;
} else
return (tGATT_STATUS)GATT_BUSY; /* max pending command, application error */
}