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| 1 | +/* | |
| 2 | + * Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +/* | |
| 27 | + * | |
| 28 | + * (C) Copyright IBM Corp. 1999 All Rights Reserved. | |
| 29 | + * Copyright 1997 The Open Group Research Institute. All rights reserved. | |
| 30 | + */ | |
| 31 | + | |
| 32 | +package sun.security.krb5.internal; | |
| 33 | + | |
| 34 | +import java.io.*; | |
| 35 | +import java.net.*; | |
| 36 | + | |
| 37 | +public abstract class NetClient { | |
| 38 | + public static NetClient getInstance(String protocol, String hostname, int port, | |
| 39 | + int timeout) throws IOException { | |
| 40 | + if (protocol.equals("TCP")) { | |
| 41 | + return new TCPClient(hostname, port, timeout); | |
| 42 | + } else { | |
| 43 | + return new UDPClient(hostname, port, timeout); | |
| 44 | + } | |
| 45 | + } | |
| 46 | + | |
| 47 | + abstract public void send(byte[] data) throws IOException; | |
| 48 | + | |
| 49 | + abstract public byte[] receive() throws IOException; | |
| 50 | + | |
| 51 | + abstract public void close() throws IOException; | |
| 52 | +} | |
| 53 | + | |
| 54 | +class TCPClient extends NetClient { | |
| 55 | + | |
| 56 | + private Socket tcpSocket; | |
| 57 | + private BufferedOutputStream out; | |
| 58 | + private BufferedInputStream in; | |
| 59 | + | |
| 60 | + TCPClient(String hostname, int port, int timeout) | |
| 61 | + throws IOException { | |
| 62 | + tcpSocket = new Socket(); | |
| 63 | + tcpSocket.connect(new InetSocketAddress(hostname, port), timeout); | |
| 64 | + out = new BufferedOutputStream(tcpSocket.getOutputStream()); | |
| 65 | + in = new BufferedInputStream(tcpSocket.getInputStream()); | |
| 66 | + tcpSocket.setSoTimeout(timeout); | |
| 67 | + } | |
| 68 | + | |
| 69 | + @Override | |
| 70 | + public void send(byte[] data) throws IOException { | |
| 71 | + byte[] lenField = new byte[4]; | |
| 72 | + intToNetworkByteOrder(data.length, lenField, 0, 4); | |
| 73 | + out.write(lenField); | |
| 74 | + | |
| 75 | + out.write(data); | |
| 76 | + out.flush(); | |
| 77 | + } | |
| 78 | + | |
| 79 | + @Override | |
| 80 | + public byte[] receive() throws IOException { | |
| 81 | + byte[] lenField = new byte[4]; | |
| 82 | + int count = readFully(lenField, 4); | |
| 83 | + | |
| 84 | + if (count != 4) { | |
| 85 | + if (Krb5.DEBUG) { | |
| 86 | + System.out.println( | |
| 87 | + ">>>DEBUG: TCPClient could not read length field"); | |
| 88 | + } | |
| 89 | + return null; | |
| 90 | + } | |
| 91 | + | |
| 92 | + int len = networkByteOrderToInt(lenField, 0, 4); | |
| 93 | + if (Krb5.DEBUG) { | |
| 94 | + System.out.println( | |
| 95 | + ">>>DEBUG: TCPClient reading " + len + " bytes"); | |
| 96 | + } | |
| 97 | + if (len <= 0) { | |
| 98 | + if (Krb5.DEBUG) { | |
| 99 | + System.out.println( | |
| 100 | + ">>>DEBUG: TCPClient zero or negative length field: "+len); | |
| 101 | + } | |
| 102 | + return null; | |
| 103 | + } | |
| 104 | + | |
| 105 | + byte data[] = new byte[len]; | |
| 106 | + count = readFully(data, len); | |
| 107 | + if (count != len) { | |
| 108 | + if (Krb5.DEBUG) { | |
| 109 | + System.out.println( | |
| 110 | + ">>>DEBUG: TCPClient could not read complete packet (" + | |
| 111 | + len + "/" + count + ")"); | |
| 112 | + } | |
| 113 | + return null; | |
| 114 | + } else { | |
| 115 | + return data; | |
| 116 | + } | |
| 117 | + } | |
| 118 | + | |
| 119 | + @Override | |
| 120 | + public void close() throws IOException { | |
| 121 | + tcpSocket.close(); | |
| 122 | + } | |
| 123 | + | |
| 124 | + /** | |
| 125 | + * Read requested number of bytes before returning. | |
| 126 | + * @return The number of bytes actually read; -1 if none read | |
| 127 | + */ | |
| 128 | + private int readFully(byte[] inBuf, int total) throws IOException { | |
| 129 | + int count, pos = 0; | |
| 130 | + | |
| 131 | + while (total > 0) { | |
| 132 | + count = in.read(inBuf, pos, total); | |
| 133 | + | |
| 134 | + if (count == -1) { | |
| 135 | + return (pos == 0? -1 : pos); | |
| 136 | + } | |
| 137 | + pos += count; | |
| 138 | + total -= count; | |
| 139 | + } | |
| 140 | + return pos; | |
| 141 | + } | |
| 142 | + | |
| 143 | + /** | |
| 144 | + * Returns the integer represented by 4 bytes in network byte order. | |
| 145 | + */ | |
| 146 | + private static int networkByteOrderToInt(byte[] buf, int start, | |
| 147 | + int count) { | |
| 148 | + if (count > 4) { | |
| 149 | + throw new IllegalArgumentException( | |
| 150 | + "Cannot handle more than 4 bytes"); | |
| 151 | + } | |
| 152 | + | |
| 153 | + int answer = 0; | |
| 154 | + | |
| 155 | + for (int i = 0; i < count; i++) { | |
| 156 | + answer <<= 8; | |
| 157 | + answer |= ((int)buf[start+i] & 0xff); | |
| 158 | + } | |
| 159 | + return answer; | |
| 160 | + } | |
| 161 | + | |
| 162 | + /** | |
| 163 | + * Encodes an integer into 4 bytes in network byte order in the buffer | |
| 164 | + * supplied. | |
| 165 | + */ | |
| 166 | + private static void intToNetworkByteOrder(int num, byte[] buf, | |
| 167 | + int start, int count) { | |
| 168 | + if (count > 4) { | |
| 169 | + throw new IllegalArgumentException( | |
| 170 | + "Cannot handle more than 4 bytes"); | |
| 171 | + } | |
| 172 | + | |
| 173 | + for (int i = count-1; i >= 0; i--) { | |
| 174 | + buf[start+i] = (byte)(num & 0xff); | |
| 175 | + num >>>= 8; | |
| 176 | + } | |
| 177 | + } | |
| 178 | +} | |
| 179 | + | |
| 180 | +class UDPClient extends NetClient { | |
| 181 | + InetAddress iaddr; | |
| 182 | + int iport; | |
| 183 | + int bufSize = 65507; | |
| 184 | + DatagramSocket dgSocket; | |
| 185 | + DatagramPacket dgPacketIn; | |
| 186 | + | |
| 187 | + UDPClient(String hostname, int port, int timeout) | |
| 188 | + throws UnknownHostException, SocketException { | |
| 189 | + iaddr = InetAddress.getByName(hostname); | |
| 190 | + iport = port; | |
| 191 | + dgSocket = new DatagramSocket(); | |
| 192 | + dgSocket.setSoTimeout(timeout); | |
| 193 | + } | |
| 194 | + | |
| 195 | + @Override | |
| 196 | + public void send(byte[] data) throws IOException { | |
| 197 | + DatagramPacket dgPacketOut = new DatagramPacket(data, data.length, | |
| 198 | + iaddr, iport); | |
| 199 | + dgSocket.send(dgPacketOut); | |
| 200 | + } | |
| 201 | + | |
| 202 | + @Override | |
| 203 | + public byte[] receive() throws IOException { | |
| 204 | + byte ibuf[] = new byte[bufSize]; | |
| 205 | + dgPacketIn = new DatagramPacket(ibuf, ibuf.length); | |
| 206 | + try { | |
| 207 | + dgSocket.receive(dgPacketIn); | |
| 208 | + } | |
| 209 | + catch (SocketException e) { | |
| 210 | + dgSocket.receive(dgPacketIn); | |
| 211 | + } | |
| 212 | + byte[] data = new byte[dgPacketIn.getLength()]; | |
| 213 | + System.arraycopy(dgPacketIn.getData(), 0, data, 0, | |
| 214 | + dgPacketIn.getLength()); | |
| 215 | + return data; | |
| 216 | + } | |
| 217 | + | |
| 218 | + @Override | |
| 219 | + public void close() { | |
| 220 | + dgSocket.close(); | |
| 221 | + } | |
| 222 | +} | |