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Commit f89e0d92 authored by Myles Watson's avatar Myles Watson Committed by android-build-merger
Browse files

bluetooth: Find the device's Bluetooth address 

am: 6a7d6222

Change-Id: I4fb90149fa1003f58e7fa1ee4d9274a9e1337dbe
parents 49b6dcb9 6a7d6222

bluetooth/1.0/default/Android.bp

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@@ -19,18 +19,34 @@ cc_library_shared { 
    srcs: [

        "async_fd_watcher.cc",

        "bluetooth_hci.cc",

        "bluetooth_address.cc",

        "vendor_interface.cc",

    ],

    shared_libs: [

        "liblog",

        "android.hardware.bluetooth@1.0",

        "libbase",

        "libcutils",

        "libhardware",

        "libhwbinder",

        "libbase",

        "libcutils",

        "libutils",

        "libhidlbase",

        "libhidltransport",

        "android.hardware.bluetooth@1.0",

        "liblog",

        "libutils",

    ],

}



cc_test_host {

    name: "bluetooth-vendor-interface-unit-tests",

    srcs: [

        "bluetooth_address.cc",

        "test/bluetooth_address_test.cc",

        "test/properties.cc",

    ],

    local_include_dirs: [

        "test",

    ],

    shared_libs: [

        "libbase",

        "liblog",

    ],

}

bluetooth/1.0/default/bluetooth_address.cc

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//

// Copyright 2016 The Android Open Source Project

//

// 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.

//



#include "bluetooth_address.h"



#include <android-base/logging.h>

#include <cutils/properties.h>

#include <fcntl.h>

#include <utils/Log.h>



namespace android {

namespace hardware {

namespace bluetooth {

namespace V1_0 {

namespace implementation {



void BluetoothAddress::bytes_to_string(const uint8_t* addr, char* addr_str) {

  sprintf(addr_str, "%02x:%02x:%02x:%02x:%02x:%02x", addr[0], addr[1], addr[2],

          addr[3], addr[4], addr[5]);

}



bool BluetoothAddress::string_to_bytes(const char* addr_str, uint8_t* addr) {

  if (addr_str == NULL) return false;

  if (strnlen(addr_str, kStringLength) != kStringLength) return false;

  unsigned char trailing_char = '\0';



  return (sscanf(addr_str, "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx%1c",

                 &addr[0], &addr[1], &addr[2], &addr[3], &addr[4], &addr[5],

                 &trailing_char) == kBytes);

}



bool BluetoothAddress::get_local_address(uint8_t* local_addr) {

  char property[PROPERTY_VALUE_MAX] = {0};

  bool valid_bda = false;



  // Get local bdaddr storage path from a system property.

  if (property_get(PROPERTY_BT_BDADDR_PATH, property, NULL)) {

    int addr_fd;



    ALOGD("%s: Trying %s", __func__, property);



    addr_fd = open(property, O_RDONLY);

    if (addr_fd != -1) {

      int bytes_read = read(addr_fd, property, kStringLength);

      CHECK(bytes_read == kStringLength);

      close(addr_fd);



      // Null terminate the string.

      property[kStringLength] = '\0';



      // If the address is not all zeros, then use it.

      const uint8_t zero_bdaddr[kBytes] = {0, 0, 0, 0, 0, 0};

      if ((string_to_bytes(property, local_addr)) &&

          (memcmp(local_addr, zero_bdaddr, kBytes) != 0)) {

        valid_bda = true;

        ALOGD("%s: Got Factory BDA %s", __func__, property);

      }

    }

  }



  // No BDADDR found in the file. Look for BDA in a factory property.

  if (!valid_bda && property_get(FACTORY_BDADDR_PROPERTY, property, NULL) &&

      string_to_bytes(property, local_addr)) {

    valid_bda = true;

  }



  // No factory BDADDR found. Look for a previously stored BDA.

  if (!valid_bda && property_get(PERSIST_BDADDR_PROPERTY, property, NULL) &&

      string_to_bytes(property, local_addr)) {

    valid_bda = true;

  }



  return valid_bda;

}



}  // namespace implementation

}  // namespace V1_0

}  // namespace bluetooth

}  // namespace hardware

}  // namespace android

bluetooth/1.0/default/bluetooth_address.h

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//

// Copyright 2016 The Android Open Source Project

//

// 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.

//



#pragma once



#include <fcntl.h>



#include <cstdint>

#include <string>

#include <vector>



namespace android {

namespace hardware {

namespace bluetooth {

namespace V1_0 {

namespace implementation {



// The property key stores the storage location of Bluetooth Device Address

static constexpr char PROPERTY_BT_BDADDR_PATH[] = "ro.bt.bdaddr_path";



// Check for a legacy address stored as a property.

static constexpr char PERSIST_BDADDR_PROPERTY[] =

    "persist.service.bdroid.bdaddr";



// If there is no valid bdaddr available from PROPERTY_BT_BDADDR_PATH and there

// is no available persistent bdaddr available from PERSIST_BDADDR_PROPERTY,

// use a factory set address.

static constexpr char FACTORY_BDADDR_PROPERTY[] = "ro.boot.btmacaddr";



// Encapsulate handling for Bluetooth Addresses:

class BluetoothAddress {

 public:

  // Conversion constants

  static constexpr size_t kStringLength = sizeof("XX:XX:XX:XX:XX:XX") - 1;

  static constexpr size_t kBytes = (kStringLength + 1) / 3;



  static void bytes_to_string(const uint8_t* addr, char* addr_str);



  static bool string_to_bytes(const char* addr_str, uint8_t* addr);



  static bool get_local_address(uint8_t* addr);

};



} // namespace implementation

} // namespace V1_0

} // namespace bluetooth

} // namespace hardware

} // namespace android

bluetooth/1.0/default/test/bluetooth_address_test.cc

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//

// Copyright 2016 The Android Open Source Project

//

// 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.

//



#include <cutils/properties.h>

#include <fcntl.h>

#include <gtest/gtest.h>



#include <string>

#include <vector>

using std::vector;



#include "bluetooth_address.h"



namespace android {

namespace hardware {

namespace bluetooth {

namespace V1_0 {

namespace implementation {



constexpr char kTestAddr1[BluetoothAddress::kStringLength + 1] =

    "12:34:56:78:9a:bc";

constexpr uint8_t kTestAddr1_bytes[BluetoothAddress::kBytes] = {

    0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc};

constexpr char kZeros[BluetoothAddress::kStringLength + 1] =

    "00:00:00:00:00:00";

constexpr uint8_t kZeros_bytes[BluetoothAddress::kBytes] = {0x00, 0x00, 0x00,

                                                            0x00, 0x00, 0x00};

constexpr char kTestAddrBad1[BluetoothAddress::kStringLength + 1] =

    "bb:aa:dd:00:00:01";

constexpr uint8_t kTestAddrBad1_bytes[BluetoothAddress::kBytes] = {

    0xbb, 0xaa, 0xdd, 0x00, 0x00, 0x01};



constexpr char kAddrPath[] = "/tmp/my_address_in_a_file.txt";



class BluetoothAddressTest : public ::testing::Test {

 public:

  BluetoothAddressTest() {}

  ~BluetoothAddressTest() {}



  void FileWriteString(const char* path, const char* string);

};



void BluetoothAddressTest::FileWriteString(const char* path,

                                           const char* string) {

  int fd = open(path, O_CREAT | O_RDWR);

  EXPECT_TRUE(fd > 0) << "err = " << strerror(errno);



  size_t length = strlen(string);

  size_t bytes_written = write(fd, string, length);



  EXPECT_EQ(length, bytes_written) << strerror(errno);



  close(fd);

}



TEST_F(BluetoothAddressTest, string_to_bytes) {

  uint8_t addr[BluetoothAddress::kBytes];



  // Malformed addresses

  EXPECT_FALSE(BluetoothAddress::string_to_bytes("", addr));

  EXPECT_FALSE(BluetoothAddress::string_to_bytes("000000000000", addr));

  EXPECT_FALSE(BluetoothAddress::string_to_bytes("00:00:00:00:0000", addr));

  EXPECT_FALSE(BluetoothAddress::string_to_bytes("00:00:00:00:00:0", addr));

  EXPECT_FALSE(BluetoothAddress::string_to_bytes("00:00:00:00:00:0;", addr));

  EXPECT_FALSE(BluetoothAddress::string_to_bytes("aB:cD:eF:Gh:iJ:Kl", addr));

  EXPECT_FALSE(BluetoothAddress::string_to_bytes("00:00:000:00:00:0;", addr));

  EXPECT_FALSE(BluetoothAddress::string_to_bytes("12:34:56:78:90:12;", addr));

  EXPECT_FALSE(BluetoothAddress::string_to_bytes("12:34:56:78:90:123", addr));



  // Reasonable addresses

  EXPECT_TRUE(BluetoothAddress::string_to_bytes("00:00:00:00:00:00", addr));

  EXPECT_TRUE(BluetoothAddress::string_to_bytes("a5:a5:a5:a5:a5:a5", addr));

  EXPECT_TRUE(BluetoothAddress::string_to_bytes("5A:5A:5A:5A:5A:5A", addr));

  EXPECT_TRUE(BluetoothAddress::string_to_bytes("AA:BB:CC:DD:EE:FF", addr));

  EXPECT_TRUE(BluetoothAddress::string_to_bytes("aa:bb:cc:dd:ee:ff", addr));



  // Compare the output to known bytes

  uint8_t addrA[BluetoothAddress::kBytes];

  uint8_t addrB[BluetoothAddress::kBytes];



  // kTestAddr1

  EXPECT_TRUE(BluetoothAddress::string_to_bytes(kTestAddr1, addrA));

  EXPECT_TRUE(memcmp(addrA, kTestAddr1_bytes, BluetoothAddress::kBytes) == 0);



  // kZeros

  EXPECT_TRUE(BluetoothAddress::string_to_bytes(kZeros, addrB));

  EXPECT_TRUE(memcmp(addrB, kZeros_bytes, BluetoothAddress::kBytes) == 0);



  // kTestAddr1 != kZeros

  EXPECT_FALSE(memcmp(addrA, addrB, BluetoothAddress::kBytes) == 0);

}



TEST_F(BluetoothAddressTest, bytes_to_string) {

  char addrA[BluetoothAddress::kStringLength + 1] = "";

  char addrB[BluetoothAddress::kStringLength + 1] = "";



  // kTestAddr1

  BluetoothAddress::bytes_to_string(kTestAddr1_bytes, addrA);

  EXPECT_TRUE(memcmp(addrA, kTestAddr1, BluetoothAddress::kStringLength) == 0);



  // kZeros

  BluetoothAddress::bytes_to_string(kZeros_bytes, addrB);

  EXPECT_TRUE(memcmp(addrB, kZeros, BluetoothAddress::kStringLength) == 0);



  // kTestAddr1 != kZeros

  EXPECT_FALSE(memcmp(addrA, addrB, BluetoothAddress::kStringLength) == 0);

}



TEST_F(BluetoothAddressTest, property_set) {

  // Set the properties to empty strings.

  property_set(PERSIST_BDADDR_PROPERTY, "");

  property_set(PROPERTY_BT_BDADDR_PATH, "");

  property_set(FACTORY_BDADDR_PROPERTY, "");



  // Get returns 0.

  char prop[PROP_VALUE_MAX] = "";

  EXPECT_TRUE(property_get(PERSIST_BDADDR_PROPERTY, prop, NULL) == 0);

  EXPECT_TRUE(property_get(PROPERTY_BT_BDADDR_PATH, prop, NULL) == 0);

  EXPECT_TRUE(property_get(FACTORY_BDADDR_PROPERTY, prop, NULL) == 0);



  // Set the properties to known strings.

  property_set(PERSIST_BDADDR_PROPERTY, "1");

  property_set(PROPERTY_BT_BDADDR_PATH, "22");

  property_set(FACTORY_BDADDR_PROPERTY, "333");



  // Get returns the correct length.

  EXPECT_TRUE(property_get(PERSIST_BDADDR_PROPERTY, prop, NULL) == 1);

  EXPECT_TRUE(property_get(PROPERTY_BT_BDADDR_PATH, prop, NULL) == 2);

  EXPECT_TRUE(property_get(FACTORY_BDADDR_PROPERTY, prop, NULL) == 3);



  // Set the properties to empty strings again.

  property_set(PERSIST_BDADDR_PROPERTY, "");

  property_set(PROPERTY_BT_BDADDR_PATH, "");

  property_set(FACTORY_BDADDR_PROPERTY, "");



  // Get returns 0.

  EXPECT_TRUE(property_get(PERSIST_BDADDR_PROPERTY, prop, NULL) == 0);

  EXPECT_TRUE(property_get(PROPERTY_BT_BDADDR_PATH, prop, NULL) == 0);

  EXPECT_TRUE(property_get(FACTORY_BDADDR_PROPERTY, prop, NULL) == 0);

}



TEST_F(BluetoothAddressTest, property_get) {

  // Set the properties to known strings.

  property_set(PERSIST_BDADDR_PROPERTY, PERSIST_BDADDR_PROPERTY);

  property_set(PROPERTY_BT_BDADDR_PATH, PROPERTY_BT_BDADDR_PATH);

  property_set(FACTORY_BDADDR_PROPERTY, FACTORY_BDADDR_PROPERTY);



  // Get returns the same strings.

  char prop[PROP_VALUE_MAX] = "";

  EXPECT_TRUE(property_get(PERSIST_BDADDR_PROPERTY, prop, NULL) > 0);

  EXPECT_TRUE(strcmp(PERSIST_BDADDR_PROPERTY, prop) == 0);



  EXPECT_TRUE(property_get(PROPERTY_BT_BDADDR_PATH, prop, NULL) > 0);

  EXPECT_TRUE(strcmp(PROPERTY_BT_BDADDR_PATH, prop) == 0);



  EXPECT_TRUE(property_get(FACTORY_BDADDR_PROPERTY, prop, NULL) > 0);

  EXPECT_TRUE(strcmp(FACTORY_BDADDR_PROPERTY, prop) == 0);



  // Set a property to a different known string.

  char prop2[PROP_VALUE_MAX] = "Erased";

  property_set(PERSIST_BDADDR_PROPERTY, prop2);



  // Get returns the correct strings.

  EXPECT_TRUE(property_get(PERSIST_BDADDR_PROPERTY, prop, NULL) > 0);

  EXPECT_TRUE(strcmp(prop2, prop) == 0);



  EXPECT_TRUE(property_get(PROPERTY_BT_BDADDR_PATH, prop, NULL) > 0);

  EXPECT_TRUE(strcmp(PROPERTY_BT_BDADDR_PATH, prop) == 0);



  EXPECT_TRUE(property_get(FACTORY_BDADDR_PROPERTY, prop, NULL) > 0);

  EXPECT_TRUE(strcmp(FACTORY_BDADDR_PROPERTY, prop) == 0);



  // Set another property to prop2.

  property_set(PROPERTY_BT_BDADDR_PATH, prop2);



  EXPECT_TRUE(property_get(PERSIST_BDADDR_PROPERTY, prop, NULL) > 0);

  EXPECT_TRUE(strcmp(prop2, prop) == 0);



  EXPECT_TRUE(property_get(PROPERTY_BT_BDADDR_PATH, prop, NULL) > 0);

  EXPECT_TRUE(strcmp(prop2, prop) == 0);



  EXPECT_TRUE(property_get(FACTORY_BDADDR_PROPERTY, prop, NULL) > 0);

  EXPECT_TRUE(strcmp(FACTORY_BDADDR_PROPERTY, prop) == 0);



  // Set the third property to prop2.

  property_set(FACTORY_BDADDR_PROPERTY, prop2);



  EXPECT_TRUE(property_get(PERSIST_BDADDR_PROPERTY, prop, NULL) > 0);

  EXPECT_TRUE(strcmp(prop2, prop) == 0);



  EXPECT_TRUE(property_get(PROPERTY_BT_BDADDR_PATH, prop, NULL) > 0);

  EXPECT_TRUE(strcmp(prop2, prop) == 0);



  EXPECT_TRUE(property_get(FACTORY_BDADDR_PROPERTY, prop, NULL) > 0);

  EXPECT_TRUE(strcmp(prop2, prop) == 0);

}



TEST_F(BluetoothAddressTest, get_local_address) {

  EXPECT_TRUE(property_set(PERSIST_BDADDR_PROPERTY, "") == 0);

  EXPECT_TRUE(property_set(FACTORY_BDADDR_PROPERTY, "") == 0);

  uint8_t address[BluetoothAddress::kBytes];



  // File contains a non-zero Address.

  FileWriteString(kAddrPath, kTestAddr1);

  EXPECT_TRUE(property_set(PROPERTY_BT_BDADDR_PATH, kAddrPath) == 0);

  EXPECT_TRUE(BluetoothAddress::get_local_address(address));

  EXPECT_TRUE(memcmp(address, kTestAddr1_bytes, BluetoothAddress::kBytes) == 0);



  // File contains a zero address.

  FileWriteString(kAddrPath, kZeros);

  EXPECT_TRUE(property_set(PROPERTY_BT_BDADDR_PATH, kAddrPath) == 0);

  EXPECT_FALSE(BluetoothAddress::get_local_address(address));



  // Factory property contains an address.

  EXPECT_TRUE(property_set(PERSIST_BDADDR_PROPERTY, kTestAddrBad1) == 0);

  EXPECT_TRUE(property_set(FACTORY_BDADDR_PROPERTY, kTestAddr1) == 0);

  EXPECT_TRUE(BluetoothAddress::get_local_address(address));

  EXPECT_TRUE(memcmp(address, kTestAddr1_bytes, BluetoothAddress::kBytes) == 0);



  // Persistent property contains an address.

  memcpy(address, kTestAddrBad1_bytes, BluetoothAddress::kBytes);

  EXPECT_TRUE(property_set(PERSIST_BDADDR_PROPERTY, kTestAddr1) == 0);

  EXPECT_TRUE(property_set(FACTORY_BDADDR_PROPERTY, "") == 0);

  EXPECT_TRUE(property_set(PROPERTY_BT_BDADDR_PATH, "") == 0);

  EXPECT_TRUE(BluetoothAddress::get_local_address(address));

  EXPECT_TRUE(memcmp(address, kTestAddr1_bytes, BluetoothAddress::kBytes) == 0);

}



}  // namespace implementation

}  // namespace V1_0

}  // namespace bluetooth

}  // namespace hardware

}  // namespace android

bluetooth/1.0/default/test/properties.cc

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//

// Copyright 2016 The Android Open Source Project

//

// 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 "properties"



#include <ctype.h>

#include <stdbool.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>



#include <cutils/properties.h>

#include <utils/Log.h>



static const int MAX_PROPERTIES = 5;



struct property {

  char key[PROP_KEY_MAX + 2];

  char value[PROP_VALUE_MAX + 2];

};



int num_properties = 0;

struct property properties[MAX_PROPERTIES];



// Find the correct entry.

static int property_find(const char *key) {

  for (int i = 0; i < num_properties; i++) {

    if (strncmp(properties[i].key, key, PROP_KEY_MAX) == 0) {

      return i;

    }

  }

  return MAX_PROPERTIES;

}



int property_set(const char *key, const char *value) {

  if (strnlen(value, PROP_VALUE_MAX) > PROP_VALUE_MAX) return -1;



  // Check to see if the property exists.

  int prop_index = property_find(key);



  if (prop_index == MAX_PROPERTIES) {

    if (num_properties >= MAX_PROPERTIES) return -1;

    prop_index = num_properties;

    num_properties += 1;

  }



  // This is test code.  Be nice and don't push the boundary cases!

  strncpy(properties[prop_index].key, key, PROP_KEY_MAX + 1);

  strncpy(properties[prop_index].value, value, PROP_VALUE_MAX + 1);

  return 0;

}



int property_get(const char *key, char *value, const char *default_value) {

  // This doesn't mock the behavior of default value

  if (default_value != NULL) ALOGE("%s: default_value is ignored!", __func__);



  // Check to see if the property exists.

  int prop_index = property_find(key);



  if (prop_index == MAX_PROPERTIES) return 0;



  int len = strlen(properties[prop_index].value);

  memcpy(value, properties[prop_index].value, len);

  value[len] = '\0';

  return len;

}