1 /*
2  * Copyright (C) 2010 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package android.net.dhcp;
18 
19 import java.net.Inet4Address;
20 import java.nio.ByteBuffer;
21 
22 /**
23  * This class implements the (unused) DHCP-INFORM packet.
24  */
25 public class DhcpInformPacket extends DhcpPacket {
26     /**
27      * Generates an INFORM packet with the specified parameters.
28      */
DhcpInformPacket(int transId, short secs, Inet4Address clientIp, Inet4Address yourIp, Inet4Address nextIp, Inet4Address relayIp, byte[] clientMac)29     DhcpInformPacket(int transId, short secs, Inet4Address clientIp, Inet4Address yourIp,
30                      Inet4Address nextIp, Inet4Address relayIp,
31                      byte[] clientMac) {
32         super(transId, secs, clientIp, yourIp, nextIp, relayIp, clientMac, false);
33     }
34 
toString()35     public String toString() {
36         String s = super.toString();
37         return s + " INFORM";
38     }
39 
40     /**
41      * Builds an INFORM packet.
42      */
buildPacket(int encap, short destUdp, short srcUdp)43     public ByteBuffer buildPacket(int encap, short destUdp, short srcUdp) {
44         ByteBuffer result = ByteBuffer.allocate(MAX_LENGTH);
45 
46         fillInPacket(encap, mClientIp, mYourIp, destUdp, srcUdp, result,
47             DHCP_BOOTREQUEST, false);
48         result.flip();
49         return result;
50     }
51 
52     /**
53      * Adds additional parameters to the INFORM packet.
54      */
finishPacket(ByteBuffer buffer)55     void finishPacket(ByteBuffer buffer) {
56         addTlv(buffer, DHCP_MESSAGE_TYPE, DHCP_MESSAGE_TYPE_INFORM);
57         addTlv(buffer, DHCP_CLIENT_IDENTIFIER, getClientId());
58         addCommonClientTlvs(buffer);
59         addTlv(buffer, DHCP_PARAMETER_LIST, mRequestedParams);
60         addTlvEnd(buffer);
61     }
62 }
63