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/*
* Copyright (C) 2018 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.net.dhcp;
import java.net.Inet4Address;
import java.nio.ByteBuffer;
/**
* Implements DHCP-RELEASE
*/
public class DhcpReleasePacket extends DhcpPacket {
final Inet4Address mClientAddr;
/**
* Generates a RELEASE packet with the specified parameters.
*/
public DhcpReleasePacket(int transId, Inet4Address serverId, Inet4Address clientAddr,
Inet4Address relayIp, byte[] clientMac) {
super(transId, (short)0, clientAddr, INADDR_ANY /* yourIp */, INADDR_ANY /* nextIp */,
relayIp, clientMac, false /* broadcast */);
mServerIdentifier = serverId;
mClientAddr = clientAddr;
}
@Override
public ByteBuffer buildPacket(int encap, short destUdp, short srcUdp) {
ByteBuffer result = ByteBuffer.allocate(MAX_LENGTH);
fillInPacket(encap, mServerIdentifier /* destIp */, mClientIp /* srcIp */, destUdp, srcUdp,
result, DHCP_BOOTREPLY, mBroadcast);
result.flip();
return result;
}
@Override
void finishPacket(ByteBuffer buffer) {
addTlv(buffer, DHCP_MESSAGE_TYPE, DHCP_MESSAGE_TYPE_RELEASE);
addTlv(buffer, DHCP_CLIENT_IDENTIFIER, getClientId());
addTlv(buffer, DHCP_SERVER_IDENTIFIER, mServerIdentifier);
addCommonClientTlvs(buffer);
addTlvEnd(buffer);
}
}
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