Android Open Source - FileRenamer Execute As Root Base

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License

The source code is released under:

License text from http://www.opensource.org/licenses/GPL-3.0 Copyright (c) 2012 Thomas Schmid, Froburgstrasse 25, 4052 Basel, Schweiz Permission is hereby granted, free of charge, to any person obta...

Java Source Code

/*
 * Copyright (C) 2012 Thomas Schmid <tschmid35@gmail.com>
 */*from   www  .  ja v  a2  s . c  o  m*/
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package com.scto.filerenamer;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import android.util.Log;

// http://muzikant-android.blogspot.ch/2011/02/how-to-get-root-access-and-execute.html
public abstract class ExecuteAsRootBase
{
  public static boolean canRunRootCommands()
  {
      boolean retval = false;
      Process suProcess;
    
      try
      {
      suProcess = Runtime.getRuntime().exec( "su" );
      
      DataOutputStream os = new DataOutputStream( suProcess.getOutputStream() );
          DataInputStream osRes = new DataInputStream( suProcess.getInputStream() );
      
          if( null != os && null != osRes )
          {
            // Getting the id of the current user to check if this is root
            os.writeBytes( "id\n" );
            os.flush();

            String currUid = osRes.readLine();
            boolean exitSu = false;
            if( null == currUid )
            {
                retval = false;
                exitSu = false;
                Log.d( "ROOT", "Can't get root access or denied by user" );
            }
            else if( true == currUid.contains( "uid=0" ) )
            {
                retval = true;
                exitSu = true;
                Log.d( "ROOT", "Root access granted" );
            }
            else
            {
                retval = false;
                exitSu = true;
                Log.d( "ROOT", "Root access rejected: " + currUid );
            }

            if( exitSu )
            {
                os.writeBytes( "exit\n" );
                os.flush();
            }
          }
      }
      catch( Exception e )
      {
          // Can't get root !
          // Probably broken pipe exception on trying to write to output
          // stream after su failed, meaning that the device is not rooted
      
          retval = false;
          Log.d( "ROOT", "Root access rejected [" +
              e.getClass().getName() + "] : " + e.getMessage() );
      }

      return retval;
    }
    
    public final boolean execute()
    {
      boolean retval = false;
    
      try
      {
          ArrayList< String > commands = getCommandsToExecute();
          if( null != commands && commands.size() > 0 )
          {
            Process suProcess = Runtime.getRuntime().exec( "su" );

            DataOutputStream os = 
                new DataOutputStream( suProcess.getOutputStream() );

            // Execute commands that require root access
            for( String currCommand : commands )
            {
                os.writeBytes( currCommand + "\n" );
                os.flush();
            }

            os.writeBytes( "exit\n" );
            os.flush();

            try
            {
                int suProcessRetval = suProcess.waitFor();
                if( 255 != suProcessRetval )
                {
                  // Root access granted
                  retval = true;
                }
                else
                {
                  // Root access denied
                  retval = false;
                }
            }
            catch( Exception ex )
            {
                Log.e( "ROOT", "Error executing root action", ex );
            }
          }
      }
      catch( IOException ex )
      {
          Log.w( "ROOT", "Can't get root access", ex );
      }
      catch( SecurityException ex )
      {
          Log.w( "ROOT", "Can't get root access", ex );
      }
      catch( Exception ex )
      {
          Log.w( "ROOT", "Error executing internal operation", ex );
      }
    
      return retval;
    }
  
    protected abstract ArrayList< String > getCommandsToExecute();
}

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