/*
* 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.
*/
/**
* @author Mikhail A. Markov
*/
package org.apache.harmony.rmi.transport.tcp;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.Socket;
import java.rmi.RemoteException;
import java.rmi.UnmarshalException;
import java.rmi.server.UID;
import java.security.AccessController;
import org.apache.harmony.rmi.common.GetLongPropAction;
import org.apache.harmony.rmi.common.RMILog;
import org.apache.harmony.rmi.common.RMIProperties;
import org.apache.harmony.rmi.internal.nls.Messages;
import org.apache.harmony.rmi.server.ServerConnection;
import org.apache.harmony.rmi.server.ServerConnectionManager;
/**
* Tcp extension of ServerConnection.
*
* @author Mikhail A. Markov
*/
public class TcpServerConnection extends ServerConnection {
/** Log for logging tcp connections activity. */
protected static final RMILog tcpTransportLog = RMILog.getTcpTransportLog();
/*
* The time used as an idle timeout for incoming connections (in ms).
* Default value is 2 * 3600 * 1000 ms (2 hours).
*/
private static int readTimeout = ((Long) AccessController.doPrivileged(
new GetLongPropAction(RMIProperties.READTIMEOUT_PROP,
2 * 3600 * 1000))).intValue();
/**
* Constructs TcpServerConnection working through socket specified.
*
* @param s Socket connected to the client
* @param mgr ConnectionManager managing this connection
*
* @throws IOException if an I/O error occurred during getting
* input/output streams from specified socket
*/
public TcpServerConnection(Socket s, ServerConnectionManager mgr)
throws IOException {
super(s, mgr);
s.setSoTimeout(readTimeout);
}
/**
* @see ServerConnection.clientProtocolAck()
*/
protected int clientProtocolAck() throws IOException {
byte data;
DataInputStream din = new DataInputStream(in);
try {
// read RMI header
int header = din.readInt();
if (header != RMI_HEADER) {
// rmi.82=Unknown header: {0}
throw new UnmarshalException(Messages.getString("rmi.82", header)); //$NON-NLS-1$
}
// read RMI protocol version
short ver = din.readShort();
if (ver != PROTOCOL_VER) {
// rmi.83=Unknown RMI protocol version: {0}
throw new UnmarshalException(Messages.getString("rmi.83", ver)); //$NON-NLS-1$
}
} catch (IOException ioe) {
// rmi.84=Unable to read RMI protocol header
throw new UnmarshalException(Messages.getString("rmi.84"), //$NON-NLS-1$
ioe);
}
if (tcpTransportLog.isLoggable(RMILog.VERBOSE)) {
// rmi.85=Using protocol version {0}
tcpTransportLog.log(RMILog.VERBOSE, Messages.getString("rmi.85", //$NON-NLS-1$
PROTOCOL_VER));
}
DataOutputStream dout = new DataOutputStream(out);
// read protocol type
if (din.readByte() == STREAM_PROTOCOL) {
if (tcpTransportLog.isLoggable(RMILog.VERBOSE)) {
// rmi.90=Using stream RMI protocol
tcpTransportLog.log(RMILog.VERBOSE,
Messages.getString("rmi.90")); //$NON-NLS-1$
}
} else {
dout.writeByte(PROTOCOL_NOT_SUPPORTED);
dout.flush();
return -1;
}
// send ack msg
dout.writeByte(PROTOCOL_ACK);
// send client's host and port
String host = s.getInetAddress().getHostAddress();
int port = s.getPort();
dout.writeUTF(host);
dout.writeInt(port);
dout.flush();
if (tcpTransportLog.isLoggable(RMILog.VERBOSE)) {
// rmi.log.136=Server is seeing client as {0}:{1}
tcpTransportLog.log(RMILog.VERBOSE,
Messages.getString("rmi.log.136", host, port)); //$NON-NLS-1$ //$NON-NLS-2$
}
// read host and port
din.readUTF();
din.readInt();
// protocol is agreed
return STREAM_PROTOCOL;
}
/**
* @see ServerConnection.waitCallMsg()
*/
protected int waitCallMsg() throws IOException {
int data;
while (true) {
try {
data = in.read();
} catch (IOException ioe) {
data = -1;
}
if (data == -1) {
if (tcpTransportLog.isLoggable(RMILog.BRIEF)) {
// rmi.log.123=Connection [{0}] is closed
tcpTransportLog.log(RMILog.BRIEF,
Messages.getString("rmi.log.123", toString())); //$NON-NLS-1$ //$NON-NLS-2$
}
return -1;
}
DataOutputStream dout = new DataOutputStream(out);
if (data == PING_MSG) {
if (tcpTransportLog.isLoggable(RMILog.VERBOSE)) {
// rmi.log.124=Got ping request
tcpTransportLog.log(RMILog.VERBOSE,
Messages.getString("rmi.log.124")); //$NON-NLS-1$
}
// send ping ack
dout.writeByte(PING_ACK);
dout.flush();
} else if (data == DGCACK_MSG) {
if (tcpTransportLog.isLoggable(RMILog.VERBOSE)) {
// rmi.log.125=Got DGC ack request
tcpTransportLog.log(RMILog.VERBOSE,
Messages.getString("rmi.log.125")); //$NON-NLS-1$
}
dgcUnregisterUID(UID.read(new DataInputStream(in)));
} else if (data == CALL_MSG) {
if (tcpTransportLog.isLoggable(RMILog.VERBOSE)) {
// rmi.log.126=Got call request
tcpTransportLog.log(RMILog.VERBOSE,
Messages.getString("rmi.log.126")); //$NON-NLS-1$
}
return data;
} else {
if (tcpTransportLog.isLoggable(RMILog.BRIEF)) {
// rmi.log.127=Unknown request got: {0}
tcpTransportLog.log(RMILog.BRIEF,
Messages.getString("rmi.log.127", data)); //$NON-NLS-1$
}
// rmi.91=Unknown message got: {0}
throw new RemoteException(Messages.getString("rmi.91", data)); //$NON-NLS-1$
}
}
}
/**
* Returns string representation of this connection.
*
* @return string representation of this connection
*/
public String toString() {
return "TcpServerConnection: remote endpoint:" + ep; //$NON-NLS-1$
}
}