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/**
 * Copyright 2003-2016 SSHTOOLS Limited. All Rights Reserved.
 *
 * For product documentation visit https://www.sshtools.com/
 *
 * This file is part of J2SSH Maverick.
 *
 * J2SSH Maverick is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * J2SSH Maverick is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with J2SSH Maverick.  If not, see .
 */
/**
 * This file is originally from the http://sourceforge.net/projects/jsocks/
 * released under the LGPL.
 */
package socks;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.UnknownHostException;

/**
 Abstract class which describes SOCKS4/5 response/request.
*/
public abstract class ProxyMessage{
   /** Host as an IP address */
   public InetAddress ip=null;
   /** SOCKS version, or version of the response for SOCKS4*/
   public int version;
   /** Port field of the request/response*/
   public int port;
   /** Request/response code as an int*/
   public int command;
   /** Host as string.*/
   public String host=null;
   /** User field for SOCKS4 request messages*/
   public String user=null;

   ProxyMessage(int command,InetAddress ip,int port){
      this.command = command;
      this.ip      = ip;
      this.port    = port;
   }

   ProxyMessage(){
   }


   /**
     Initialises Message from the stream. Reads server response from
     given stream.
     @param in Input stream to read response from.
     @throws SocksException If server response code is not SOCKS_SUCCESS(0), or
     if any error with protocol occurs.
     @throws IOException If any error happens with I/O.
   */
   public abstract void read(InputStream in)
                                    throws SocksException,
                                           IOException;


   /**
     Initialises Message from the stream. Reads server response or client 
     request from given stream.
     
     @param in Input stream to read response from.
     @param clinetMode If true read server response, else read client request.
     @throws SocksException If server response code is not SOCKS_SUCCESS(0) and
     reading in client mode, or if any error with protocol occurs.
     @throws IOException If any error happens with I/O.
   */
   public abstract void read(InputStream in,boolean client_mode)
                                    throws SocksException,
                                           IOException;


   /**
    Writes the message to the stream.
    @param out Output stream to which message should be written.
   */
   public abstract void write(OutputStream out)throws SocksException,
                                             IOException;

   /**
    Get the Address field of this message as InetAddress object.
    @return Host address or null, if one can't be determined.
   */
   public InetAddress getInetAddress() throws UnknownHostException{
     return ip;
   }


   /**
    Get string representaion of this message.
    @return string representation of this message.
   */
   public String toString(){
      return 
      "Proxy Message:\n"+
      "Version:"+ version+"\n"+
      "Command:"+ command+"\n"+
      "IP:     "+ ip+"\n"+
      "Port:   "+ port+"\n"+
      "User:   "+ user+"\n" ;
   }

//Package methods
//////////////////

   static final String bytes2IPV4(byte[] addr,int offset){
      String hostName = ""+(addr[offset] & 0xFF);
      for(int i = offset+1;i