| /* |
| * 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 android.util.Log; |
| |
| import java.net.InetAddress; |
| import java.net.Inet4Address; |
| import java.nio.ByteBuffer; |
| |
| /** |
| * This class implements the DHCP-REQUEST packet. |
| */ |
| class DhcpRequestPacket extends DhcpPacket { |
| /** |
| * Generates a REQUEST packet with the specified parameters. |
| */ |
| DhcpRequestPacket(int transId, InetAddress clientIp, byte[] clientMac, |
| boolean broadcast) { |
| super(transId, clientIp, Inet4Address.ANY, Inet4Address.ANY, |
| Inet4Address.ANY, clientMac, broadcast); |
| } |
| |
| public String toString() { |
| String s = super.toString(); |
| return s + " REQUEST, desired IP " + mRequestedIp + " from host '" |
| + mHostName + "', param list length " |
| + (mRequestedParams == null ? 0 : mRequestedParams.length); |
| } |
| |
| /** |
| * Fills in a packet with the requested REQUEST attributes. |
| */ |
| public ByteBuffer buildPacket(int encap, short destUdp, short srcUdp) { |
| ByteBuffer result = ByteBuffer.allocate(MAX_LENGTH); |
| |
| fillInPacket(encap, Inet4Address.ALL, Inet4Address.ANY, destUdp, srcUdp, |
| result, DHCP_BOOTREQUEST, mBroadcast); |
| result.flip(); |
| return result; |
| } |
| |
| /** |
| * Adds the optional parameters to the client-generated REQUEST packet. |
| */ |
| void finishPacket(ByteBuffer buffer) { |
| byte[] clientId = new byte[7]; |
| |
| // assemble client identifier |
| clientId[0] = CLIENT_ID_ETHER; |
| System.arraycopy(mClientMac, 0, clientId, 1, 6); |
| |
| addTlv(buffer, DHCP_MESSAGE_TYPE, DHCP_MESSAGE_TYPE_REQUEST); |
| addTlv(buffer, DHCP_PARAMETER_LIST, mRequestedParams); |
| addTlv(buffer, DHCP_REQUESTED_IP, mRequestedIp); |
| addTlv(buffer, DHCP_SERVER_IDENTIFIER, mServerIdentifier); |
| addTlv(buffer, DHCP_CLIENT_IDENTIFIER, clientId); |
| addTlvEnd(buffer); |
| } |
| |
| /** |
| * Notifies the specified state machine of the REQUEST packet parameters. |
| */ |
| public void doNextOp(DhcpStateMachine machine) { |
| InetAddress clientRequest = |
| mRequestedIp == null ? mClientIp : mRequestedIp; |
| Log.v(TAG, "requested IP is " + mRequestedIp + " and client IP is " + |
| mClientIp); |
| machine.onRequestReceived(mBroadcast, mTransId, mClientMac, |
| clientRequest, mRequestedParams, mHostName); |
| } |
| } |