1 // 2 // Copyright 2016 The Android Open Source Project 3 // 4 // Licensed under the Apache License, Version 2.0 (the "License"); 5 // you may not use this file except in compliance with the License. 6 // You may obtain a copy of the License at 7 // 8 // http://www.apache.org/licenses/LICENSE-2.0 9 // 10 // Unless required by applicable law or agreed to in writing, software 11 // distributed under the License is distributed on an "AS IS" BASIS, 12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 // See the License for the specific language governing permissions and 14 // limitations under the License. 15 // 16 17 #include "bluetooth_address.h" 18 19 #include <cutils/properties.h> 20 #include <errno.h> 21 #include <fcntl.h> 22 #include <unistd.h> 23 #include <utils/Log.h> 24 25 namespace android { 26 namespace hardware { 27 namespace bluetooth { 28 namespace V1_0 { 29 namespace implementation { 30 31 void BluetoothAddress::bytes_to_string(const uint8_t* addr, char* addr_str) { 32 sprintf(addr_str, "%02x:%02x:%02x:%02x:%02x:%02x", addr[0], addr[1], addr[2], 33 addr[3], addr[4], addr[5]); 34 } 35 36 bool BluetoothAddress::string_to_bytes(const char* addr_str, uint8_t* addr) { 37 if (addr_str == NULL) return false; 38 if (strnlen(addr_str, kStringLength) != kStringLength) return false; 39 unsigned char trailing_char = '\0'; 40 41 return (sscanf(addr_str, "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx%1c", 42 &addr[0], &addr[1], &addr[2], &addr[3], &addr[4], &addr[5], 43 &trailing_char) == kBytes); 44 } 45 46 bool BluetoothAddress::get_local_address(uint8_t* local_addr) { 47 char property[PROPERTY_VALUE_MAX] = {0}; 48 49 // Get local bdaddr storage path from a system property. 50 if (property_get(PROPERTY_BT_BDADDR_PATH, property, NULL)) { 51 ALOGD("%s: Trying %s", __func__, property); 52 53 int addr_fd = open(property, O_RDONLY); 54 if (addr_fd != -1) { 55 char address[kStringLength + 1] = {0}; 56 int bytes_read = read(addr_fd, address, kStringLength); 57 if (bytes_read == -1) { 58 ALOGE("%s: Error reading address from %s: %s", __func__, property, 59 strerror(errno)); 60 } 61 close(addr_fd); 62 63 // Null terminate the string. 64 address[kStringLength] = '\0'; 65 66 // If the address is not all zeros, then use it. 67 const uint8_t zero_bdaddr[kBytes] = {0, 0, 0, 0, 0, 0}; 68 if ((string_to_bytes(address, local_addr)) && 69 (memcmp(local_addr, zero_bdaddr, kBytes) != 0)) { 70 ALOGD("%s: Got Factory BDA %s", __func__, address); 71 return true; 72 } else { 73 ALOGE("%s: Got Invalid BDA '%s' from %s", __func__, address, property); 74 } 75 } 76 } 77 78 // No BDADDR found in the file. Look for BDA in a factory property. 79 if (property_get(FACTORY_BDADDR_PROPERTY, property, NULL) && 80 string_to_bytes(property, local_addr)) { 81 return true; 82 } 83 84 // No factory BDADDR found. Look for a previously stored BDA. 85 if (property_get(PERSIST_BDADDR_PROPERTY, property, NULL) && 86 string_to_bytes(property, local_addr)) { 87 return true; 88 } 89 90 return false; 91 } 92 93 } // namespace implementation 94 } // namespace V1_0 95 } // namespace bluetooth 96 } // namespace hardware 97 } // namespace android 98
