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5 * regarding copyright ownership. The ASF licenses this file *
6 * to you under the Apache License, Version 2.0 (the *
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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
21
22 package org.apache.james.smtpserver.core;
23
24 import java.util.ArrayList;
25 import java.util.Collection;
26
27 import org.apache.james.dsn.DSNStatus;
28 import org.apache.james.smtpserver.CommandHandler;
29 import org.apache.james.smtpserver.SMTPSession;
30
31 /**
32 * Default command handler for handling unknown commands
33 */
34 public class UnknownCmdHandler implements CommandHandler {
35
36 /**
37 * The name of the command handled by the command handler
38 */
39 public static final String UNKNOWN_COMMAND = "UNKNOWN";
40
41 private boolean stopHandlerProcessing = true;
42
43 /**
44 * Handler method called upon receipt of an unrecognized command.
45 * Returns an error response and logs the command.
46 *
47 * @see org.apache.james.smtpserver.CommandHandler#onCommand(SMTPSession)
48 **/
49 public void onCommand(SMTPSession session) {
50
51 //If there was message failure, don't consider it as an unknown command
52 if (session.getState().get(SMTPSession.MESG_FAILED) != null) {
53 return;
54 }
55
56 session.getResponseBuffer().append("500 "+DSNStatus.getStatus(DSNStatus.PERMANENT, DSNStatus.DELIVERY_INVALID_CMD))
57 .append(" Command ")
58 .append(session.getCommandName())
59 .append(" unrecognized.");
60 String responseString = session.clearResponseBuffer();
61
62 session.writeResponse(responseString);
63 }
64
65 /**
66 * @see org.apache.james.smtpserver.CommandHandler#getImplCommands()
67 */
68 public Collection getImplCommands() {
69 Collection implCommands = new ArrayList();
70 implCommands.add("UNKNOWN");
71
72 return implCommands;
73 }
74 }