1 /************************************************************************
2 * Copyright (c) 1999-2006 The Apache Software Foundation. *
3 * All rights reserved. *
4 * ------------------------------------------------------------------- *
5 * Licensed under the Apache License, Version 2.0 (the "License"); you *
6 * may not use this file except in compliance with the License. You *
7 * may obtain a copy of the License at: *
8 * *
9 * http://www.apache.org/licenses/LICENSE-2.0 *
10 * *
11 * Unless required by applicable law or agreed to in writing, software *
12 * distributed under the License is distributed on an "AS IS" BASIS, *
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or *
14 * implied. See the License for the specific language governing *
15 * permissions and limitations under the License. *
16 ***********************************************************************/
17
18 package org.apache.james.smtpserver;
19
20 import org.apache.james.util.mail.dsn.DSNStatus;
21
22 /***
23 * Default command handler for handling unknown commands
24 */
25 public class UnknownCmdHandler implements CommandHandler {
26
27 /***
28 * The name of the command handled by the command handler
29 */
30 public static final String UNKNOWN_COMMAND = "UNKNOWN";
31
32 /***
33 * Handler method called upon receipt of an unrecognized command.
34 * Returns an error response and logs the command.
35 *
36 * @see org.apache.james.smtpserver.CommandHandler#onCommand(SMTPSession)
37 **/
38 public void onCommand(SMTPSession session) {
39
40
41 if (session.getState().get(SMTPSession.MESG_FAILED) != null) {
42 return;
43 }
44
45 session.getResponseBuffer().append("500 "+DSNStatus.getStatus(DSNStatus.PERMANENT, DSNStatus.DELIVERY_INVALID_CMD))
46 .append(" Command ")
47 .append(session.getCommandName())
48 .append(" unrecognized.");
49 String responseString = session.clearResponseBuffer();
50
51 session.writeResponse(responseString);
52 }
53
54 }