97 lines
3.1 KiB
C++
97 lines
3.1 KiB
C++
//
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// Copyright 2016 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#include "bluetooth_address.h"
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#include <cutils/properties.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <utils/Log.h>
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namespace android {
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namespace hardware {
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namespace bluetooth {
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namespace V1_0 {
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namespace implementation {
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void BluetoothAddress::bytes_to_string(const uint8_t* addr, char* addr_str) {
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sprintf(addr_str, "%02x:%02x:%02x:%02x:%02x:%02x", addr[0], addr[1], addr[2],
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addr[3], addr[4], addr[5]);
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}
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bool BluetoothAddress::string_to_bytes(const char* addr_str, uint8_t* addr) {
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if (addr_str == NULL) return false;
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if (strnlen(addr_str, kStringLength) != kStringLength) return false;
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unsigned char trailing_char = '\0';
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return (sscanf(addr_str, "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx%1c",
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&addr[0], &addr[1], &addr[2], &addr[3], &addr[4], &addr[5],
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&trailing_char) == kBytes);
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}
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bool BluetoothAddress::get_local_address(uint8_t* local_addr) {
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char property[PROPERTY_VALUE_MAX] = {0};
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// Get local bdaddr storage path from a system property.
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if (property_get(PROPERTY_BT_BDADDR_PATH, property, NULL)) {
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ALOGD("%s: Trying %s", __func__, property);
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int addr_fd = open(property, O_RDONLY);
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if (addr_fd != -1) {
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char address[kStringLength + 1] = {0};
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int bytes_read = read(addr_fd, address, kStringLength);
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if (bytes_read == -1) {
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ALOGE("%s: Error reading address from %s: %s", __func__, property,
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strerror(errno));
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}
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close(addr_fd);
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// Null terminate the string.
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address[kStringLength] = '\0';
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// If the address is not all zeros, then use it.
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const uint8_t zero_bdaddr[kBytes] = {0, 0, 0, 0, 0, 0};
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if ((string_to_bytes(address, local_addr)) &&
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(memcmp(local_addr, zero_bdaddr, kBytes) != 0)) {
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ALOGD("%s: Got Factory BDA %s", __func__, address);
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return true;
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} else {
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ALOGE("%s: Got Invalid BDA '%s' from %s", __func__, address, property);
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}
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}
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}
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// No BDADDR found in the file. Look for BDA in a factory property.
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if (property_get(FACTORY_BDADDR_PROPERTY, property, NULL) &&
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string_to_bytes(property, local_addr)) {
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return true;
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}
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// No factory BDADDR found. Look for a previously stored BDA.
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if (property_get(PERSIST_BDADDR_PROPERTY, property, NULL) &&
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string_to_bytes(property, local_addr)) {
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return true;
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}
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return false;
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}
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} // namespace implementation
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} // namespace V1_0
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} // namespace bluetooth
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} // namespace hardware
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} // namespace android
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