/*******************************************************************************
    * Copyright (c) 2007, 2014 Massimiliano Ziccardi
    *
    * 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.
   *******************************************************************************/
  package it.jnrpe.plugin;
  
  import it.jnrpe.ICommandLine;
  import it.jnrpe.ReturnValue;
  import it.jnrpe.Status;
  import it.jnrpe.plugins.PluginBase;
  import it.jnrpe.utils.StreamManager;
  import it.jnrpe.utils.StringUtils;
  
  import java.io.BufferedReader;
  import java.io.File;
  import java.io.InputStreamReader;
  
  /**
   * Executes external (executable) plugins.
   *
   * @author Massimiliano Ziccardi
   */
  public class CNativePlugin extends PluginBase {
  
      /**
       * The first parameter must be the full
       * path to the executable.
       *
       * The rest of the array is sent to the executable as commands parameters
       * @param cl The parsed command line
       * @return The return value of the plugin
       */
      public final ReturnValue execute(final ICommandLine cl) {
          File fProcessFile = new File(cl.getOptionValue("executable"));
          StreamManager streamMgr = new StreamManager();
  
          if (!fProcessFile.exists()) {
              return new ReturnValue(Status.UNKNOWN,
                      "Could not exec executable : "
                              + fProcessFile.getAbsolutePath());
          }
  
          try {
              String[] vsParams =
                      StringUtils.split(cl.getOptionValue("args", ""), false);
              String[] vCommand = new String[vsParams.length + 1];
              vCommand[0] = cl.getOptionValue("executable");
              System.arraycopy(vsParams, 0, vCommand, 1, vsParams.length);
              Process p = Runtime.getRuntime().exec(vCommand);
              BufferedReader br =
                      (BufferedReader) streamMgr.handle(new BufferedReader(
                              new InputStreamReader(p.getInputStream())));
              String sMessage = br.readLine();
              int iReturnCode = p.waitFor();
  
              return new ReturnValue(Status.fromIntValue(iReturnCode), sMessage);
          } catch (Exception e) {
              log.warn("Error executing the native plugin : "
                      + e.getMessage(), e);
              return new ReturnValue(Status.UNKNOWN,
                      "Could not exec executable : " + fProcessFile.getName()
                              + " - ERROR : " + e.getMessage());
          } finally {
              streamMgr.closeAll();
          }
      }
  
      @Override
      protected String getPluginName() {
          return "NATIVE";
      }
  }