android10通过nvram读写wifi蓝牙MAC

android10通过nvram读写wifi蓝牙MAC

• 前言
• 一、怎么使用NVRAM
• 二、使用方式
• • 1.se修改
  • 2.上读写代码
• 总结

前言

一般在出厂的时候就会写好MAC地址，不能更改，但是有一些特殊需求，或者测试的时候，需要改到这一块，这里我们还是用NvRam来在上层做一个读写

一、怎么使用NVRAM

参考这个在上层app应用使用Nvram
找到Nvram的jar包，implementation files(‘libs\nvram.jar’)这样引用， 不然会报找不到类

二、使用方式

1.se修改

这个部分，有一些修改忘记了，可能没有diff上去， 如果碰到了权限问题，自己增加一下se就行

diff --git a/alps/device/mediatek/mt8168/sepolicy/basic/system_app.te b/alps/device/mediatek/mtxxxx/sepolicy/basic/system_app.te
@@ -8,3 +8,9 @@ allow system_app alarm_device:chr_file read;allow system_app alarm_device:chr_file open;allow system_app alarm_device:chr_file ioctl;allow system_app storage_stub_file:dir getattr;
+allow system_app system_data_file:file write;
+allow system_app system_data_file:file read;
+allow system_app system_data_file:file create;
+allow system_app system_data_file:dir write;
+allow system_app system_data_file:dir read;
+allow system_app system_data_file:dir add_name;diff --git a/alps/system/sepolicy/prebuilts/api/29.0/public/app.te b/alps/system/sepolicy/prebuilts/api/29.0/public/app.te
@@ -461,7 +461,7 @@ 
-neverallow appdomain system_data_file:dir_file_class_set
+neverallow {appdomain -system_app} system_data_file:dir_file_class_set{ create write setattr relabelfrom relabelto append unlink link rename };# Write to various other parts of /data.
diff --git a/alps/system/sepolicy/public/app.te b/alps/system/sepolicy/public/app.te
@@ -461,7 +461,7 @@ 
-neverallow appdomain system_data_file:dir_file_class_set
+neverallow {appdomain -system_app} system_data_file:dir_file_class_set{ create write setattr relabelfrom relabelto append unlink link rename };

2.上读写代码

这里就直接贴一个Activity的代码了，要打包成系统app，其他没要求

import androidx.appcompat.app.AppCompatActivity;import android.os.Bundle;
import android.os.RemoteException;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;import com.android.internal.util.HexDump;import java.util.ArrayList;
import java.util.StringTokenizer;import vendor.mediatek.hardware.nvram.V1_0.INvram;public class MacActivity extends Activity {final String MAC_WIFI_ADDRESS_FILENAME = "/mnt/vendor/nvdata/APCFG/APRDEB/WIFI";final String MAC_BT_ADDRESS_FILENAME = "/mnt/vendor/nvdata/APCFG/APRDEB/BT_Addr";final int MAC_WIFI_ADDRESS_OFFSET = 4;final int MAC_BT_ADDRESS_OFFSET = 0;final int MAC_ADDRESS_DIGITS = 6;private TextView tv_wifi_mac,tv_bluetooth_mac;private EditText et_wifi_mac,et_bluetooth_mac;private Button bt_get,bt_set_wifi_mac,bt_set_bluetooth_mac;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_mac);//tv_wifi_mac.setText(getMacAddr(MAC_WIFI_ADDRESS_FILENAME,MAC_WIFI_ADDRESS_OFFSET,MAC_ADDRESS_DIGITS));//tv_wifi_mac.setText(getMacAddr(MAC_BT_ADDRESS_FILENAME,MAC_BT_ADDRESS_OFFSET,MAC_ADDRESS_DIGITS));tv_wifi_mac=findViewById(R.id.tv_wifi_mac);tv_bluetooth_mac=findViewById(R.id.tv_bluetooth_mac);et_wifi_mac=findViewById(R.id.et_wifi_mac);et_bluetooth_mac=findViewById(R.id.et_bluetooth_mac);bt_get=findViewById(R.id.bt_get);bt_set_wifi_mac=findViewById(R.id.bt_set_wifi_mac);bt_set_bluetooth_mac=findViewById(R.id.bt_set_bluetooth_mac);bt_get.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {tv_wifi_mac.setText(getMacAddr(MAC_WIFI_ADDRESS_FILENAME,MAC_WIFI_ADDRESS_OFFSET,MAC_ADDRESS_DIGITS));tv_bluetooth_mac.setText(getMacAddr(MAC_BT_ADDRESS_FILENAME,MAC_BT_ADDRESS_OFFSET,MAC_ADDRESS_DIGITS));}});bt_set_wifi_mac.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {String mac=et_wifi_mac.getText().toString();if(mac.length()!=12){Toast.makeText(MacActivity.this,"mac错误",Toast.LENGTH_SHORT).show();return;}mac=mac.toUpperCase();String data=mac.substring(0,2)+":"+mac.substring(2,4)+":"+mac.substring(4,6)+":"+mac.substring(6,8)+":"+mac.substring(8,10)+":"+mac.substring(10,12);Toast.makeText(MacActivity.this,data,Toast.LENGTH_SHORT).show();updateMacAddr(MAC_WIFI_ADDRESS_FILENAME,data,MAC_WIFI_ADDRESS_OFFSET,MAC_ADDRESS_DIGITS);}});//et_wifi_mac.setText("2A4AEFE223ee");bt_set_bluetooth_mac.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {String mac=et_bluetooth_mac.getText().toString();if(mac.length()!=12){Toast.makeText(MacActivity.this,"mac错误",Toast.LENGTH_SHORT).show();return;}mac=mac.toUpperCase();String data=mac.substring(0,2)+":"+mac.substring(2,4)+":"+mac.substring(4,6)+":"+mac.substring(6,8)+":"+mac.substring(8,10)+":"+mac.substring(10,12);Toast.makeText(MacActivity.this,data,Toast.LENGTH_SHORT).show();updateMacAddr(MAC_BT_ADDRESS_FILENAME,data,MAC_BT_ADDRESS_OFFSET,MAC_ADDRESS_DIGITS);}});//et_bluetooth_mac.setText("3E:1D:46:B3:A7:62");//et_bluetooth_mac.setText("3E1D46B3a762");}public String getMacAddr(String file, int offset, int size) {Log.d(TAG, "getMacAddress(): start");StringBuffer nvramBuf = new StringBuffer();try {int i = 0;String buff = null;INvram agent = INvram.getService();if (agent == null) {Log.e(TAG, "NvRAMAgent is null");}try {buff = agent.readFileByName(file, offset + size);} catch (Exception e) {e.printStackTrace();}Log.i(TAG, "Raw data:" + buff);if (buff.length() < 2 * (offset + size)) {}// Remove the \0 special character.int macLen = buff.length() - 1;for (i = offset * 2; i < macLen; i += 2) {if ((i + 2) < macLen) {nvramBuf.append(buff.substring(i, i + 2));nvramBuf.append(":");} else {nvramBuf.append(buff.substring(i));}}Log.d(TAG, "buff:" + nvramBuf.toString());} catch (RemoteException re) {re.printStackTrace();} catch (IndexOutOfBoundsException iobe) {iobe.printStackTrace();} finally {Log.d(TAG, "getMacAddress(): end");}return nvramBuf.toString();}private void updateMacAddr(String file, String mac, int offset, int size) {try {int i = 0;INvram agent = INvram.getService();byte[] macAddr = new byte[size];if (agent == null) {Log.e(TAG, "NvRAMAgent is null");return;}//parse mac address firstlyStringTokenizer txtBuffer = new StringTokenizer(mac, ":");while (txtBuffer.hasMoreTokens()) {macAddr[i] = (byte) Integer.parseInt(txtBuffer.nextToken(), 16);i++;}if (i != size) {Log.e(TAG, "Wrong length of macAddr:" + i);Log.d(TAG, "The format of mac address is not correct");return;}String buff = null;try {buff = agent.readFileByName(file, offset + size);} catch (Exception e) {e.printStackTrace();return;}// Remove \0 in the endbyte[] buffArr = HexDump.hexStringToByteArray(buff.substring(0, buff.length() - 1));for (i = 0; i < size; i ++) {Log.e(TAG, "i:" + i);Log.e(TAG, "size:" + size);if(file.equals(MAC_WIFI_ADDRESS_FILENAME))buffArr[i + MAC_WIFI_ADDRESS_OFFSET] = macAddr[i];else if(file.equals(MAC_BT_ADDRESS_FILENAME))buffArr[i + MAC_BT_ADDRESS_OFFSET] = macAddr[i];else {Log.e(TAG, "Wrong file of name:" + file);return;}}ArrayList<Byte> dataArray = new ArrayList<Byte>(offset + size);for (i = 0; i < offset + size; i++) {dataArray.add(i, new Byte(buffArr[i]));}int flag = 0;try {flag = agent.writeFileByNamevec(file,offset + size, dataArray);} catch (Exception e) {e.printStackTrace();Log.d(TAG, e.getMessage() + ":" + e.getCause());return;}Log.d(TAG, "Update successfully.\r\nPlease reboot this device");} catch (Exception e) {Log.d(TAG,e.getMessage() + ":" + e.getCause());e.printStackTrace();}}
}

总结

读写位置和偏移量要写正确，具体要去底层看一下，其实底层是有读写源码的，搜一搜关键字/mnt/vendor/nvdata/APCFG/APRDEB/WIFI这种的，具体看在哪里使用

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