72 lines
2.4 KiB
Java
72 lines
2.4 KiB
Java
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.net.dhcp;
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import android.util.Log;
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import java.net.Inet4Address;
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import java.nio.ByteBuffer;
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/**
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* This class implements the DHCP-REQUEST packet.
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*/
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class DhcpRequestPacket extends DhcpPacket {
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/**
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* Generates a REQUEST packet with the specified parameters.
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*/
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DhcpRequestPacket(int transId, short secs, Inet4Address clientIp, byte[] clientMac,
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boolean broadcast) {
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super(transId, secs, clientIp, INADDR_ANY, INADDR_ANY, INADDR_ANY, clientMac, broadcast);
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}
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public String toString() {
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String s = super.toString();
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return s + " REQUEST, desired IP " + mRequestedIp + " from host '"
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+ mHostName + "', param list length "
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+ (mRequestedParams == null ? 0 : mRequestedParams.length);
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}
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/**
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* Fills in a packet with the requested REQUEST attributes.
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*/
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public ByteBuffer buildPacket(int encap, short destUdp, short srcUdp) {
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ByteBuffer result = ByteBuffer.allocate(MAX_LENGTH);
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fillInPacket(encap, INADDR_BROADCAST, INADDR_ANY, destUdp, srcUdp,
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result, DHCP_BOOTREQUEST, mBroadcast);
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result.flip();
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return result;
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}
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/**
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* Adds the optional parameters to the client-generated REQUEST packet.
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*/
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void finishPacket(ByteBuffer buffer) {
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addTlv(buffer, DHCP_MESSAGE_TYPE, DHCP_MESSAGE_TYPE_REQUEST);
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addTlv(buffer, DHCP_CLIENT_IDENTIFIER, getClientId());
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if (!INADDR_ANY.equals(mRequestedIp)) {
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addTlv(buffer, DHCP_REQUESTED_IP, mRequestedIp);
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}
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if (!INADDR_ANY.equals(mServerIdentifier)) {
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addTlv(buffer, DHCP_SERVER_IDENTIFIER, mServerIdentifier);
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}
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addCommonClientTlvs(buffer);
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addTlv(buffer, DHCP_PARAMETER_LIST, mRequestedParams);
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addTlvEnd(buffer);
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}
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}
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