/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#include <pwd.h>
#include <assert.h>
#include <getopt.h>
#include <grp.h>

/*
* List of possible error codes.
*/
enum errorcodes {
  INVALID_ARGUMENT_NUMER = 1,
  INVALID_USER_NAME, //2
  SUPER_USER_NOT_ALLOWED_TO_RUN_COMMANDS, //3
  INITGROUPS_FAILED, //4
  SETUID_OPER_FAILED, //5
  INVALID_COMMAND_PASSED, //6
};

#undef HADOOP_PREFIX

#define SSH_COMMAND "ssh"

#define SCRIPT_DIR_PATTERN "%s/bin/hadoop-daemon.sh %s" //%s to be substituded 

#define STRLEN strlen(SCRIPT_DIR_PATTERN) + strlen(HADOOP_PREFIX)

/*
 * Function to get the user details populated given a user name. 
 */
int getuserdetails(char *user, struct passwd *user_detail);

 /*
 * Process cluster controller command the API exposed to the 
 * main in order to execute the cluster commands.
 */
int process_controller_command(char *user, char *node, char *command);