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.InetAddress; 207da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnuttimport java.net.Inet4Address; 217da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnuttimport java.nio.ByteBuffer; 227da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 237da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt/** 247da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * This class implements the DHCP-DISCOVER packet. 257da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt */ 267da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnuttclass DhcpDiscoverPacket extends DhcpPacket { 277da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt /** 287da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * Generates a DISCOVER packet with the specified parameters. 297da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt */ 307da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt DhcpDiscoverPacket(int transId, byte[] clientMac, boolean broadcast) { 317da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt super(transId, Inet4Address.ANY, Inet4Address.ANY, Inet4Address.ANY, 327da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt Inet4Address.ANY, clientMac, broadcast); 337da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt } 347da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 357da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt public String toString() { 367da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt String s = super.toString(); 377da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt return s + " DISCOVER " + 387da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt (mBroadcast ? "broadcast " : "unicast "); 397da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt } 407da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 417da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt /** 427da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * Fills in a packet with the requested DISCOVER parameters. 437da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt */ 447da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt public ByteBuffer buildPacket(int encap, short destUdp, short srcUdp) { 457da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt ByteBuffer result = ByteBuffer.allocate(MAX_LENGTH); 467da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt InetAddress destIp = Inet4Address.ALL; 477da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 487da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt fillInPacket(encap, Inet4Address.ALL, Inet4Address.ANY, destUdp, srcUdp, 497da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt result, DHCP_BOOTREQUEST, true); 507da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt result.flip(); 517da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt return result; 527da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt } 537da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 547da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt /** 557da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * Adds optional parameters to a DISCOVER packet. 567da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt */ 577da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt void finishPacket(ByteBuffer buffer) { 587da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt addTlv(buffer, DHCP_MESSAGE_TYPE, DHCP_MESSAGE_TYPE_DISCOVER); 597da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt addTlv(buffer, DHCP_PARAMETER_LIST, mRequestedParams); 607da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt addTlvEnd(buffer); 617da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt } 627da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 637da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt /** 647da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * Informs the state machine of the arrival of a DISCOVER packet. 657da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt */ 667da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt public void doNextOp(DhcpStateMachine machine) { 677da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt // currently omitted: host name 687da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt machine.onDiscoverReceived(mBroadcast, mTransId, mClientMac, 697da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt mRequestedParams); 707da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt } 717da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt} 72