content: /*
  * Conditions Of Use
  *
  * This software was developed by employees of the National Institute of
  * Standards and Technology (NIST), an agency of the Federal Government.
  * Pursuant to title 15 Untied States Code Section 105, works of NIST
  * employees are not subject to copyright protection in the United States
  * and are considered to be in the public domain.  As a result, a formal
  * license is not needed to use the software.
  *
  * This software is provided by NIST as a service and is expressly
  * provided "AS IS."  NIST MAKES NO WARRANTY OF ANY KIND, EXPRESS, IMPLIED
  * OR STATUTORY, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTY OF
  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT
  * AND DATA ACCURACY.  NIST does not warrant or make any representations
  * regarding the use of the software or the results thereof, including but
  * not limited to the correctness, accuracy, reliability or usefulness of
  * the software.
  *
  * Permission to use this software is contingent upon your acceptance
  * of the terms of this agreement
  *
  * .
  *
  */
  package gov2.nist.core.net;
  
  import java.io.IOException;
  import java.net.DatagramSocket;
  import java.net.InetAddress;
  import java.net.InetSocketAddress;
  import java.net.MulticastSocket;
  import java.net.ServerSocket;
  import java.net.Socket;
  import java.net.SocketException;
  
  /* Added by Daniel J. Martinez Manzano <dani@dif.um.es> */
  import javax.net.ssl.SSLSocket;
  import javax.net.ssl.SSLSocketFactory;
  import javax.net.ssl.SSLServerSocket;
  import javax.net.ssl.SSLServerSocketFactory;
  
  /**
   * default implementation which passes straight through to java platform
   *
   * @author m.andrews
   * @version 1.2
   * @since 1.1
   *
   */
  public class DefaultNetworkLayer implements NetworkLayer {
  
      private SSLSocketFactory sslSocketFactory;
  
      private SSLServerSocketFactory sslServerSocketFactory;
  
      /**
       * single default network layer; for flexibility, it may be better not to
       * make it a singleton, but singleton seems to make sense currently.
       */
      public static final DefaultNetworkLayer SINGLETON = new DefaultNetworkLayer();
  
      private DefaultNetworkLayer() {
          sslServerSocketFactory = (SSLServerSocketFactory) SSLServerSocketFactory
                  .getDefault();
          sslSocketFactory = (SSLSocketFactory) SSLSocketFactory.getDefault();
      }
  
      public ServerSocket createServerSocket(int port, int backlog,
              InetAddress bindAddress) throws IOException {
          return new ServerSocket(port, backlog, bindAddress);
      }
  
      public Socket createSocket(InetAddress address, int port)
              throws IOException {
          return new Socket(address, port);
      }
  
      public DatagramSocket createDatagramSocket() throws SocketException {
          return new DatagramSocket();
      }
  
      public DatagramSocket createDatagramSocket(int port, InetAddress laddr)
              throws SocketException {
  
          if ( laddr.isMulticastAddress() ) {
              try {
                  MulticastSocket ds = new MulticastSocket( port );
                  ds.joinGroup( laddr );
                  return ds;
              } catch (IOException e) {
                  throw new SocketException( e.getLocalizedMessage() );
              }
          } else return new DatagramSocket(port, laddr);
      }
  
      /* Added by Daniel J. Martinez Manzano <dani@dif.um.es> */
      public SSLServerSocket createSSLServerSocket(int port, int backlog,
              InetAddress bindAddress) throws IOException {
          return (SSLServerSocket) sslServerSocketFactory.createServerSocket(
                  port, backlog, bindAddress);
      }
  
      /* Added by Daniel J. Martinez Manzano <dani@dif.um.es> */
      public SSLSocket createSSLSocket(InetAddress address, int port)
              throws IOException {
          return (SSLSocket) sslSocketFactory.createSocket(address, port);
      }
  
      /* Added by Daniel J. Martinez Manzano <dani@dif.um.es> */
      public SSLSocket createSSLSocket(InetAddress address, int port,
              InetAddress myAddress) throws IOException {
          return (SSLSocket) sslSocketFactory.createSocket(address, port,
                  myAddress, 0);
      }
  
      public Socket createSocket(InetAddress address, int port,
              InetAddress myAddress) throws IOException {
          if (myAddress != null)
              return new Socket(address, port, myAddress, 0);
          else
              return new Socket(address, port);
      }
  
      /**
       * Creates a new Socket, binds it to myAddress:myPort and connects it to
       * address:port.
       *
       * @param address the InetAddress that we'd like to connect to.
       * @param port the port that we'd like to connect to
       * @param myAddress the address that we are supposed to bind on or null
       *        for the "any" address.
       * @param myPort the port that we are supposed to bind on or 0 for a random
       * one.
       *
       * @return a new Socket, bound on myAddress:myPort and connected to
       * address:port.
       * @throws IOException if binding or connecting the socket fail for a reason
       * (exception relayed from the correspoonding Socket methods)
       */
      public Socket createSocket(InetAddress address, int port,
                      InetAddress myAddress, int myPort)
          throws IOException
      {
          if (myAddress != null)
              return new Socket(address, port, myAddress, myPort);
          else if (port != 0)
          {
              //myAddress is null (i.e. any)  but we have a port number
              Socket sock = new Socket();
              sock.bind(new InetSocketAddress(port));
              sock.connect(new InetSocketAddress(address, port));
              return sock;
          }
          else
              return new Socket(address, port);
      }
  
  }
  