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概述
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(‘libsnvram.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;
@Override
protected 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() {
@Override
public 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() {
@Override
public 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() {
@Override
public 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 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 firstly
StringTokenizer 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 in the end
byte[] 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.rnPlease 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
最后
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