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1 /* |
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2 * Portions Copyright 2000-2003 Sun Microsystems, Inc. All Rights Reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Sun designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Sun in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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22 * CA 95054 USA or visit www.sun.com if you need additional information or |
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23 * have any questions. |
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24 */ |
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25 |
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26 /* |
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27 * |
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28 * (C) Copyright IBM Corp. 1999 All Rights Reserved. |
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29 * Copyright 1997 The Open Group Research Institute. All rights reserved. |
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30 */ |
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31 |
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32 package sun.security.krb5.internal; |
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33 |
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34 import java.io.*; |
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35 import java.net.*; |
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36 |
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37 public class TCPClient { |
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38 |
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39 private Socket tcpSocket; |
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40 private BufferedOutputStream out; |
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41 private BufferedInputStream in; |
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42 |
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43 public TCPClient(String hostname, int port) throws IOException { |
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44 tcpSocket = new Socket(hostname, port); |
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45 out = new BufferedOutputStream(tcpSocket.getOutputStream()); |
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46 in = new BufferedInputStream(tcpSocket.getInputStream()); |
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47 } |
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48 |
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49 public void send(byte[] data) throws IOException { |
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50 byte[] lenField = new byte[4]; |
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51 intToNetworkByteOrder(data.length, lenField, 0, 4); |
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52 out.write(lenField); |
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53 |
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54 out.write(data); |
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55 out.flush(); |
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56 } |
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57 |
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58 public byte[] receive() throws IOException { |
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59 byte[] lenField = new byte[4]; |
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60 int count = readFully(lenField, 4); |
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61 |
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62 if (count != 4) { |
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63 if (Krb5.DEBUG) { |
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64 System.out.println( |
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65 ">>>DEBUG: TCPClient could not read length field"); |
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66 } |
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67 return null; |
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68 } |
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69 |
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70 int len = networkByteOrderToInt(lenField, 0, 4); |
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71 if (Krb5.DEBUG) { |
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72 System.out.println( |
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73 ">>>DEBUG: TCPClient reading " + len + " bytes"); |
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74 } |
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75 if (len <= 0) { |
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76 if (Krb5.DEBUG) { |
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77 System.out.println( |
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78 ">>>DEBUG: TCPClient zero or negative length field: "+len); |
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79 } |
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80 return null; |
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81 } |
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82 |
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83 byte data[] = new byte[len]; |
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84 count = readFully(data, len); |
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85 if (count != len) { |
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86 if (Krb5.DEBUG) { |
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87 System.out.println( |
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88 ">>>DEBUG: TCPClient could not read complete packet (" + |
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89 len + "/" + count + ")"); |
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90 } |
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91 return null; |
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92 } else { |
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93 return data; |
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94 } |
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95 } |
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96 |
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97 public void close() throws IOException { |
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98 tcpSocket.close(); |
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99 } |
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100 |
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101 /** |
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102 * Read requested number of bytes before returning. |
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103 * @return The number of bytes actually read; -1 if none read |
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104 */ |
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105 private int readFully(byte[] inBuf, int total) throws IOException { |
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106 int count, pos = 0; |
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107 |
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108 while (total > 0) { |
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109 count = in.read(inBuf, pos, total); |
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110 |
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111 if (count == -1) { |
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112 return (pos == 0? -1 : pos); |
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113 } |
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114 pos += count; |
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115 total -= count; |
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116 } |
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117 return pos; |
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118 } |
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119 |
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120 /** |
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121 * Returns the integer represented by 4 bytes in network byte order. |
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122 */ |
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123 private static final int networkByteOrderToInt(byte[] buf, int start, |
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124 int count) { |
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125 if (count > 4) { |
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126 throw new IllegalArgumentException( |
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127 "Cannot handle more than 4 bytes"); |
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128 } |
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129 |
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130 int answer = 0; |
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131 |
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132 for (int i = 0; i < count; i++) { |
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133 answer <<= 8; |
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134 answer |= ((int)buf[start+i] & 0xff); |
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135 } |
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136 return answer; |
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137 } |
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138 |
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139 /** |
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140 * Encodes an integer into 4 bytes in network byte order in the buffer |
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141 * supplied. |
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142 */ |
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143 private static final void intToNetworkByteOrder(int num, byte[] buf, |
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144 int start, int count) { |
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145 if (count > 4) { |
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146 throw new IllegalArgumentException( |
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147 "Cannot handle more than 4 bytes"); |
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148 } |
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149 |
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150 for (int i = count-1; i >= 0; i--) { |
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151 buf[start+i] = (byte)(num & 0xff); |
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152 num >>>= 8; |
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153 } |
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154 } |
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155 } |