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 DHCP-DECLINE packet. 24 */ 25 class DhcpDeclinePacket extends DhcpPacket { 26 /** 27 * Generates a DECLINE packet with the specified parameters. 28 */ DhcpDeclinePacket(int transId, short secs, Inet4Address clientIp, Inet4Address yourIp, Inet4Address nextIp, Inet4Address relayIp, byte[] clientMac)29 DhcpDeclinePacket(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 + " DECLINE"; 38 } 39 40 /** 41 * Fills in a packet with the requested DECLINE attributes. 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 optional parameters to the DECLINE packet. 54 */ finishPacket(ByteBuffer buffer)55 void finishPacket(ByteBuffer buffer) { 56 addTlv(buffer, DHCP_MESSAGE_TYPE, DHCP_MESSAGE_TYPE_DECLINE); 57 addTlv(buffer, DHCP_CLIENT_IDENTIFIER, getClientId()); 58 // RFC 2131 says we MUST NOT include our common client TLVs or the parameter request list. 59 addTlvEnd(buffer); 60 } 61 } 62