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GridFTP is a high-performance, secure, reliable data transfer protocol optimized for high-bandwidth wide-area networks. The GridFTP protocol is based on FTP, the highly-popular Internet file transfer protocol. We have selected a set of protocol features and extensions defined already in IETF RFCs and added a few additional features to meet requirements from current data grid projects. This GRIDFTP libary and client is based on JAVA.

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/*
 * Copyright 1999-2006 University of Chicago
 * 
 * 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 org.globus.ftp.dc;

import org.globus.net.SocketFactory;
import org.globus.ftp.GridFTPSession;
import org.globus.ftp.DataChannelAuthentication;
import org.globus.ftp.HostPort;
import org.globus.ftp.Session;
import org.globus.ftp.vanilla.FTPServerFacade;
import org.globus.ftp.vanilla.BasicServerControlChannel;
import org.globus.ftp.extended.GridFTPServerFacade;

import java.net.Socket;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
   Unlike in the parent class, here we use authentication
   and protection.
 **/
public class GridFTPActiveConnectTask extends Task {

    private static Log logger =
        LogFactory.getLog(GridFTPActiveConnectTask.class.getName());

    protected HostPort hostPort;
    protected BasicServerControlChannel control;
    protected SocketBox box;
    protected GridFTPSession gSession;

    public GridFTPActiveConnectTask(HostPort hostPort,
                                    BasicServerControlChannel control,
                                    SocketBox box,
                                    GridFTPSession gSession) {
        if (box == null) {
            throw new IllegalArgumentException("Socket box is null");
        }
        this.hostPort = hostPort;
        this.control = control;
        this.box = box;
        this.gSession = gSession;
    }

    public void execute() {
        Socket mySocket = null;

        if (logger.isDebugEnabled()) {
            logger.debug("connecting new socket to: " + 
                         hostPort.getHost() + " " + hostPort.getPort());
        }

        SocketFactory factory = SocketFactory.getDefault();

        try {
            mySocket = factory.createSocket(hostPort.getHost(), 
                                            hostPort.getPort());

            // set TCP buffer size

            if (gSession.TCPBufferSize != Session.SERVER_DEFAULT) {
                logger.debug("setting socket's TCP buffer size to " 
                             + gSession.TCPBufferSize);
                mySocket.setReceiveBufferSize(gSession.TCPBufferSize);
                mySocket.setSendBufferSize(gSession.TCPBufferSize);
            }

            if (!gSession.dataChannelAuthentication.equals(
                         DataChannelAuthentication.NONE)) {
                                        
                logger.debug("authenticating");
                mySocket = GridFTPServerFacade.authenticate(mySocket, 
                                                            true,
                                                            // this IS client socket
                                                            gSession.credential,
                                                            gSession.dataChannelProtection,
                                                            gSession.dataChannelAuthentication);
                
            } else {
                logger.debug("not authenticating");
            }
                        
            // setting the Facade's socket list
            
            // synchronize to prevent race condidion against
            // the section in GridFTPServerFacade.setTCPBufferSize
            synchronized (box) {
                box.setSocket(mySocket);
            }

        } catch (Exception e) {
            FTPServerFacade.exceptionToControlChannel(
                                e,
                                "active connection to server failed",
                                control);
            try {
                if (mySocket != null) {
                    mySocket.close();
                }
            } catch (Exception second) {
            }
        }
    }
} // class