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/*
* Copyright (C) 2010 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;
/**
* This class implements the DHCP-DISCOVER packet.
*/
class DhcpDiscoverPacket extends DhcpPacket {
/**
* Generates a DISCOVER packet with the specified parameters.
*/
DhcpDiscoverPacket(int transId, byte[] clientMac, boolean broadcast) {
super(transId, INADDR_ANY, INADDR_ANY, INADDR_ANY, INADDR_ANY, clientMac, broadcast);
}
public String toString() {
String s = super.toString();
return s + " DISCOVER " +
(mBroadcast ? "broadcast " : "unicast ");
}
/**
* Fills in a packet with the requested DISCOVER parameters.
*/
public ByteBuffer buildPacket(int encap, short destUdp, short srcUdp) {
ByteBuffer result = ByteBuffer.allocate(MAX_LENGTH);
fillInPacket(encap, INADDR_BROADCAST, INADDR_ANY, destUdp,
srcUdp, result, DHCP_BOOTREQUEST, true);
result.flip();
return result;
}
/**
* Adds optional parameters to a DISCOVER packet.
*/
void finishPacket(ByteBuffer buffer) {
addTlv(buffer, DHCP_MESSAGE_TYPE, DHCP_MESSAGE_TYPE_DISCOVER);
addTlv(buffer, DHCP_PARAMETER_LIST, mRequestedParams);
addTlvEnd(buffer);
}
}
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