Deploy your own su in Android

Original blog

First, put your own su to the assets Directory of the Android Application project. to distinguish it from the system's su, my own su file is called sur.

In addition, I have not considered the cpu mobile phone of the x86 architecture here. Let's talk about the code! Util. java File

package cdut.robin.root.utils;import java.io.DataOutputStream;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import ledroid.nac.NacShellCommand;import android.content.Context;import android.util.Log;public class Util {    private static String getDeployMySuShellScript(String localSuPath) {        StringBuffer strBuffer = new StringBuffer();        strBuffer.append("mount -o remount,rw " + MountPoint.getDeviceName("/system") + " /system");        strBuffer.append("\n");        strBuffer.append("mount -o remount,rw /system /system");        strBuffer.append("\n");        strBuffer.append("cat ").append(localSuPath).append(">" + kSysSuPath);        strBuffer.append("\n");        strBuffer.append("chown 0:0 " + kSysSuPath);        strBuffer.append("\n");        strBuffer.append("chmod 6777 " + kSysSuPath);        strBuffer.append("\n");        strBuffer.append("mount -o remount,ro " + MountPoint.getDeviceName("/system") + " /system");        strBuffer.append("\n");        strBuffer.append("mount -o remount,ro /system /system");        strBuffer.append("\n");        return strBuffer.toString();    }    final static String kSysSuPath = "/system/xbin/sur";    private static boolean isMySuExists() {        return new File(kSysSuPath).exists();    }    private static boolean writeMySu(Context context) {        Process processShell = null;        DataOutputStream osShell = null;        String mySuTempPath = context.getFilesDir().getPath() + "/sur";        File file = new File(mySuTempPath);        if (file.exists()) {            file.delete();        }        InputStream open = null;        FileOutputStream out = null;        try {            open = context.getResources().getAssets().open("sur");            out = context.openFileOutput("sur", Context.MODE_WORLD_WRITEABLE);            byte buffer[] = new byte[4 * 1024];            int len = 0;            while ((len = open.read(buffer)) != -1) {                out.write(buffer, 0, len);            }            out.flush();        } catch (IOException e) {            LogHelper.e("TAG", "errMessage" + e.getMessage());        } finally {            if (out != null) {                try {                    out.close();                    if (open != null) {                        open.close();                    }                } catch (Exception e) {                    LogHelper.e("TAG", "errMessage" + e.getMessage());                }            }        }        Runtime runTime = Runtime.getRuntime();        try {            processShell = runTime.exec("su");            osShell = new DataOutputStream(processShell.getOutputStream());            String str = getDeployMySuShellScript(mySuTempPath);            osShell.writeBytes(str);            osShell.writeBytes("exit\n");            osShell.flush();            processShell.waitFor();        } catch (IOException e) {                        e.printStackTrace();        } catch (InterruptedException e) {                      e.printStackTrace();        } finally {            if (processShell != null) {                try {                    processShell.destroy();                } catch (Exception e) {                    // e.printStackTrace();                }                processShell = null;            }            if (osShell != null) {                try {                    osShell.close();                    osShell = null;                } catch (IOException e1) {                    // e1.printStackTrace();                }            }        }        return new File(kSysSuPath).exists();    }    public static boolean doSthBySu(Context context) {        if (!isMySuExists()) {            boolean res = writeMySu(context);            if (res) {                Log.i("robin", "deploy My Su success!");            }            else            {                Log.i("robin", "deploy My Su fail!");            }        } else{            Log.i("robin", "My su exsit!");        }        Process processShell = null;        DataOutputStream osShell = null;        //do something here by su        try {            Runtime runTime = Runtime.getRuntime();            processShell = runTime.exec("sur");            osShell = new DataOutputStream(processShell.getOutputStream());            String str = getBussinessShellScript();            osShell.writeBytes(str);            osShell.writeBytes("exit\n");            osShell.flush();        } catch (Exception e) {            e.printStackTrace();            return false;        } finally {            if (processShell != null) {                try {                    processShell.destroy();                } catch (Exception e) {                     e.printStackTrace();                }                processShell = null;            }            if (osShell != null) {                try {                    osShell.close();                    osShell = null;                } catch (IOException e1) {                    // e1.printStackTrace();                }            }        }        return true;    }    public static String getBussinessShellScript() {        return "echo hello";    }}

MountPoint. java File

package cdut.robin.root.utils;import java.io.BufferedReader;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.io.InputStreamReader;import java.util.ArrayList;import java.util.HashMap;import java.util.List;public final class MountPoint {    private static HashMap
 
   MOUNT_POINT_CACH = new HashMap(10);    private static HashMap
  
   > DEVICE_CACH = new HashMap(10);    public static boolean isMountPoint(String mountPoint) {        return getDeviceName(mountPoint) != null;    }    public static String getDeviceName(String mountPoint) {        if (mountPoint == null) {            return null;        }        String deviceName = null;        if (MOUNT_POINT_CACH.containsKey(mountPoint)) {            deviceName = (String) MOUNT_POINT_CACH.get(mountPoint);        }        return deviceName;    }    public static boolean hasMultiMountPoint(String deviceName) {        List list = getMountPoints(deviceName);        return (list != null) && (list.size() > 1);    }    public static List
   
     getMountPoints(String deviceName) {        return (List) DEVICE_CACH.get(deviceName);    }    static {        BufferedReader mountPointReader = null;        try {            mountPointReader = new BufferedReader(new InputStreamReader(new FileInputStream(new File("/proc/mounts"))));            String buffer = null;            while ((buffer = mountPointReader.readLine()) != null) {                MOUNT_POINT_CACH.put(buffer.split(" ")[1], buffer.split(" ")[0]);                List list = (List) DEVICE_CACH.get(buffer.split(" ")[0]);                if (list == null) {                    list = new ArrayList(1);                }                list.add(buffer.split(" ")[1]);                DEVICE_CACH.put(buffer.split(" ")[0], list);            }        } catch (IOException e) {        } finally {            try {                if (mountPointReader != null)                    mountPointReader.close();            } catch (IOException e) {                // TODO Auto-generated catch block                e.printStackTrace();            }        }    }}
    

   
  
 

End!