01: /****************************************************************
02: * Licensed to the Apache Software Foundation (ASF) under one *
03: * or more contributor license agreements. See the NOTICE file *
04: * distributed with this work for additional information *
05: * regarding copyright ownership. The ASF licenses this file *
06: * to you under the Apache License, Version 2.0 (the *
07: * "License"); you may not use this file except in compliance *
08: * with the License. You may obtain a copy of the License at *
09: * *
10: * http://www.apache.org/licenses/LICENSE-2.0 *
11: * *
12: * Unless required by applicable law or agreed to in writing, *
13: * software distributed under the License is distributed on an *
14: * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY *
15: * KIND, either express or implied. See the License for the *
16: * specific language governing permissions and limitations *
17: * under the License. *
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: //If there was message failure, don't consider it as an unknown command
41: if (session.getState().get(SMTPSession.MESG_FAILED) != null) {
42: return;
43: }
44:
45: session.getResponseBuffer().append(
46: "500 "
47: + DSNStatus.getStatus(DSNStatus.PERMANENT,
48: DSNStatus.DELIVERY_INVALID_CMD))
49: .append(" Command ").append(session.getCommandName())
50: .append(" unrecognized.");
51: String responseString = session.clearResponseBuffer();
52:
53: session.writeResponse(responseString);
54: }
55:
56: }
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