17da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt/* 27da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * Copyright (C) 2010 The Android Open Source Project 37da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * 47da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * Licensed under the Apache License, Version 2.0 (the "License"); 57da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * you may not use this file except in compliance with the License. 67da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * You may obtain a copy of the License at 77da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * 87da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * http://www.apache.org/licenses/LICENSE-2.0 97da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * 107da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * Unless required by applicable law or agreed to in writing, software 117da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * distributed under the License is distributed on an "AS IS" BASIS, 127da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 137da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * See the License for the specific language governing permissions and 147da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * limitations under the License. 157da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt */ 167da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 177da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnuttpackage android.net.dhcp; 187da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 197da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnuttimport java.net.Inet4Address; 207da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnuttimport java.nio.ByteBuffer; 217da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 227da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt/** 237da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * This class implements the DHCP-DISCOVER packet. 247da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt */ 257da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnuttclass DhcpDiscoverPacket extends DhcpPacket { 267da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt /** 277da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * Generates a DISCOVER packet with the specified parameters. 287da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt */ 293e979321a5d96b9e2688f67ef0f936602c0f7e5aLorenzo Colitti DhcpDiscoverPacket(int transId, short secs, byte[] clientMac, boolean broadcast) { 303e979321a5d96b9e2688f67ef0f936602c0f7e5aLorenzo Colitti super(transId, secs, INADDR_ANY, INADDR_ANY, INADDR_ANY, INADDR_ANY, clientMac, broadcast); 317da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt } 327da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 337da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt public String toString() { 347da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt String s = super.toString(); 357da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt return s + " DISCOVER " + 367da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt (mBroadcast ? "broadcast " : "unicast "); 377da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt } 387da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 397da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt /** 407da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * Fills in a packet with the requested DISCOVER parameters. 417da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt */ 427da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt public ByteBuffer buildPacket(int encap, short destUdp, short srcUdp) { 437da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt ByteBuffer result = ByteBuffer.allocate(MAX_LENGTH); 4451697effe9567a144532190ad534370a00c15996Lorenzo Colitti fillInPacket(encap, INADDR_BROADCAST, INADDR_ANY, destUdp, 45fe5ffce09c4a163ee9a190aedc9fd7cea38a576fLorenzo Colitti srcUdp, result, DHCP_BOOTREQUEST, mBroadcast); 467da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt result.flip(); 477da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt return result; 487da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt } 497da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 507da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt /** 517da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * Adds optional parameters to a DISCOVER packet. 527da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt */ 537da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt void finishPacket(ByteBuffer buffer) { 547da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt addTlv(buffer, DHCP_MESSAGE_TYPE, DHCP_MESSAGE_TYPE_DISCOVER); 55f443bfc25e80ef46aedd616d4ecb4c95abd7be7aLorenzo Colitti addTlv(buffer, DHCP_CLIENT_IDENTIFIER, getClientId()); 56fe5ffce09c4a163ee9a190aedc9fd7cea38a576fLorenzo Colitti addCommonClientTlvs(buffer); 577da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt addTlv(buffer, DHCP_PARAMETER_LIST, mRequestedParams); 587da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt addTlvEnd(buffer); 597da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt } 607da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt} 61