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3 * or more contributor license agreements. See the NOTICE file *
4 * distributed with this work for additional information *
5 * regarding copyright ownership. The ASF licenses this file *
6 * to you under the Apache License, Version 2.0 (the *
7 * "License"); you may not use this file except in compliance *
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10 * http://www.apache.org/licenses/LICENSE-2.0 *
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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. *
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19
20 package org.apache.james.smtpserver;
21
22 import org.apache.james.util.mail.dsn.DSNStatus;
23
24 /***
25 * Default command handler for handling unknown commands
26 */
27 public class UnknownCmdHandler implements CommandHandler {
28
29 /***
30 * The name of the command handled by the command handler
31 */
32 public static final String UNKNOWN_COMMAND = "UNKNOWN";
33
34 /***
35 * Handler method called upon receipt of an unrecognized command.
36 * Returns an error response and logs the command.
37 *
38 * @see org.apache.james.smtpserver.CommandHandler#onCommand(SMTPSession)
39 **/
40 public void onCommand(SMTPSession session) {
41
42
43 if (session.getState().get(SMTPSession.MESG_FAILED) != null) {
44 return;
45 }
46
47 session.getResponseBuffer().append("500 "+DSNStatus.getStatus(DSNStatus.PERMANENT, DSNStatus.DELIVERY_INVALID_CMD))
48 .append(" Command ")
49 .append(session.getCommandName())
50 .append(" unrecognized.");
51 String responseString = session.clearResponseBuffer();
52
53 session.writeResponse(responseString);
54 }
55
56 }