1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
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
8 * with the License. You may obtain a copy of the License at
9 *
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 *
19 */
20 package org.apache.directory.api.ldap.model.message.extended;
21
22
23 import org.apache.directory.api.i18n.I18n;
24 import org.apache.directory.api.ldap.model.message.ExtendedResponseImpl;
25 import org.apache.directory.api.ldap.model.message.ResultCodeEnum;
26 import org.apache.directory.api.util.Strings;
27
28
29 /**
30 * An extended operation intended for notifying clients of upcoming
31 * disconnection. Here's what <a
32 * href="http://www.faqs.org/rfcs/rfc2251.html">RFC 2251</a> has to say about
33 * it:
34 *
35 * <pre>
36 * Section 4.1.1 (Small snippet on sending NoD)
37 *
38 * If the server receives a PDU from the client in which the LDAPMessage
39 * SEQUENCE tag cannot be recognized, the messageID cannot be parsed,
40 * the tag of the protocolOp is not recognized as a request, or the
41 * encoding structures or lengths of data fields are found to be
42 * incorrect, then the server MUST return the notice of disconnection
43 * described in section 4.4.1, with resultCode protocolError, and
44 * immediately close the connection. In other cases that the server
45 * cannot parse the request received by the client, the server MUST
46 * return an appropriate response to the request, with the resultCode
47 * set to protocolError.
48 *
49 * ...
50 *
51 * 4.4. Unsolicited Notification
52 *
53 * An unsolicited notification is an LDAPMessage sent from the server to
54 * the client which is not in response to any LDAPMessage received by
55 * the server. It is used to signal an extraordinary condition in the
56 * server or in the connection between the client and the server. The
57 * notification is of an advisory nature, and the server will not expect
58 * any response to be returned from the client.
59 *
60 * The unsolicited notification is structured as an LDAPMessage in which
61 * the messageID is 0 and protocolOp is of the extendedResp form. The
62 * responseName field of the ExtendedResponse is present. The LDAPOID
63 * value MUST be unique for this notification, and not be used in any
64 * other situation.
65 *
66 * One unsolicited notification is defined in this document.
67 *
68 * 4.4.1. Notice of Disconnection
69 *
70 * This notification may be used by the server to advise the client that
71 * the server is about to close the connection due to an error
72 * condition. Note that this notification is NOT a response to an
73 * unbind requested by the client: the server MUST follow the procedures
74 * of section 4.3. This notification is intended to assist clients in
75 * distinguishing between an error condition and a transient network
76 * failure. As with a connection close due to network failure, the
77 * client MUST NOT assume that any outstanding requests which modified
78 * the directory have succeeded or failed.
79 *
80 * The responseName is 1.3.6.1.4.1.1466.20036, the response field is
81 * absent, and the resultCode is used to indicate the reason for the
82 * disconnection.
83 *
84 * The following resultCode values are to be used in this notification:
85 *
86 * - protocolError: The server has received data from the client in
87 * which the LDAPMessage structure could not be parsed.
88 *
89 * - strongAuthRequired: The server has detected that an established
90 * underlying security association protecting communication between
91 * the client and server has unexpectedly failed or been compromised.
92 *
93 * - unavailable: This server will stop accepting new connections and
94 * operations on all existing connections, and be unavailable for an
95 * extended period of time. The client may make use of an alternative
96 * server.
97 *
98 * After sending this notice, the server MUST close the connection.
99 * After receiving this notice, the client MUST NOT transmit any further
100 * on the connection, and may abruptly close the connection.
101 * </pre>
102 *
103 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
104 */
105 public final class NoticeOfDisconnect extends ExtendedResponseImpl
106 {
107 /** The OID of the NotiveOfDisconnect extended operation. */
108 public static final String EXTENSION_OID = "1.3.6.1.4.1.1466.20036";
109
110 /** The single instance with unavailable result code. */
111 public static final NoticeOfDisconnect UNAVAILABLE = new NoticeOfDisconnect( ResultCodeEnum.UNAVAILABLE );
112
113 /** The single instance with protocolError result code. */
114 public static final NoticeOfDisconnect PROTOCOLERROR = new NoticeOfDisconnect( ResultCodeEnum.PROTOCOL_ERROR );
115
116 /** The single instance with strongAuthRequired result code. */
117 public static final NoticeOfDisconnect STRONGAUTHREQUIRED = new NoticeOfDisconnect(
118 ResultCodeEnum.STRONG_AUTH_REQUIRED );
119
120
121 /**
122 * Creates a new instance of NoticeOfDisconnect.
123 */
124 private NoticeOfDisconnect( ResultCodeEnum rcode )
125 {
126 super( 0, EXTENSION_OID );
127
128 switch ( rcode )
129 {
130 case UNAVAILABLE:
131 break;
132
133 case PROTOCOL_ERROR:
134 break;
135
136 case STRONG_AUTH_REQUIRED:
137 break;
138
139 default:
140 throw new IllegalArgumentException( I18n.err( I18n.ERR_04166, ResultCodeEnum.UNAVAILABLE,
141 ResultCodeEnum.PROTOCOL_ERROR, ResultCodeEnum.STRONG_AUTH_REQUIRED ) );
142 }
143
144 super.getLdapResult().setDiagnosticMessage( rcode.toString() + ": The server will disconnect!" );
145 super.getLdapResult().setMatchedDn( null );
146 super.getLdapResult().setResultCode( rcode );
147 }
148
149
150 // ------------------------------------------------------------------------
151 // ExtendedResponse Interface Method Implementations
152 // ------------------------------------------------------------------------
153
154 /**
155 * Gets the reponse OID specific encoded response values.
156 *
157 * @return the response specific encoded response values.
158 */
159 public byte[] getResponse()
160 {
161 return Strings.EMPTY_BYTES;
162 }
163
164
165 /**
166 * Sets the response OID specific encoded response values.
167 *
168 * @param value the response specific encoded response values.
169 */
170 public void setResponse( byte[] value )
171 {
172 throw new UnsupportedOperationException( I18n.err( I18n.ERR_04173 ) );
173 }
174
175
176 /**
177 * Gets the OID uniquely identifying this extended response (a.k.a. its
178 * name).
179 *
180 * @return the OID of the extended response type.
181 */
182 @Override
183 public String getResponseName()
184 {
185 return EXTENSION_OID;
186 }
187
188
189 /**
190 * Sets the OID uniquely identifying this extended response (a.k.a. its
191 * name).
192 *
193 * @param oid
194 * the OID of the extended response type.
195 */
196 @Override
197 public void setResponseName( String oid )
198 {
199 throw new UnsupportedOperationException( I18n.err( I18n.ERR_04168, EXTENSION_OID ) );
200 }
201
202
203 /**
204 * {@inheritDoc}
205 */
206 @Override
207 public int hashCode()
208 {
209 int hash = 37;
210 // Seems simple but look at the equals() method ...
211 hash = hash * 17 + getClass().getName().hashCode();
212
213 return hash;
214 }
215
216
217 /**
218 * {@inheritDoc}
219 */
220 @Override
221 public boolean equals( Object obj )
222 {
223 if ( obj == this )
224 {
225 return true;
226 }
227
228 return obj instanceof NoticeOfDisconnect;
229 }
230 }