| /* |
| * Copyright (c) 2000, 2003, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * |
| * (C) Copyright IBM Corp. 1999 All Rights Reserved. |
| * Copyright 1997 The Open Group Research Institute. All rights reserved. |
| */ |
| |
| package sun.security.krb5.internal; |
| |
| import java.io.*; |
| import java.net.*; |
| |
| public class TCPClient { |
| |
| private Socket tcpSocket; |
| private BufferedOutputStream out; |
| private BufferedInputStream in; |
| |
| public TCPClient(String hostname, int port) throws IOException { |
| tcpSocket = new Socket(hostname, port); |
| out = new BufferedOutputStream(tcpSocket.getOutputStream()); |
| in = new BufferedInputStream(tcpSocket.getInputStream()); |
| } |
| |
| public void send(byte[] data) throws IOException { |
| byte[] lenField = new byte[4]; |
| intToNetworkByteOrder(data.length, lenField, 0, 4); |
| out.write(lenField); |
| |
| out.write(data); |
| out.flush(); |
| } |
| |
| public byte[] receive() throws IOException { |
| byte[] lenField = new byte[4]; |
| int count = readFully(lenField, 4); |
| |
| if (count != 4) { |
| if (Krb5.DEBUG) { |
| System.out.println( |
| ">>>DEBUG: TCPClient could not read length field"); |
| } |
| return null; |
| } |
| |
| int len = networkByteOrderToInt(lenField, 0, 4); |
| if (Krb5.DEBUG) { |
| System.out.println( |
| ">>>DEBUG: TCPClient reading " + len + " bytes"); |
| } |
| if (len <= 0) { |
| if (Krb5.DEBUG) { |
| System.out.println( |
| ">>>DEBUG: TCPClient zero or negative length field: "+len); |
| } |
| return null; |
| } |
| |
| byte data[] = new byte[len]; |
| count = readFully(data, len); |
| if (count != len) { |
| if (Krb5.DEBUG) { |
| System.out.println( |
| ">>>DEBUG: TCPClient could not read complete packet (" + |
| len + "/" + count + ")"); |
| } |
| return null; |
| } else { |
| return data; |
| } |
| } |
| |
| public void close() throws IOException { |
| tcpSocket.close(); |
| } |
| |
| /** |
| * Read requested number of bytes before returning. |
| * @return The number of bytes actually read; -1 if none read |
| */ |
| private int readFully(byte[] inBuf, int total) throws IOException { |
| int count, pos = 0; |
| |
| while (total > 0) { |
| count = in.read(inBuf, pos, total); |
| |
| if (count == -1) { |
| return (pos == 0? -1 : pos); |
| } |
| pos += count; |
| total -= count; |
| } |
| return pos; |
| } |
| |
| /** |
| * Returns the integer represented by 4 bytes in network byte order. |
| */ |
| private static final int networkByteOrderToInt(byte[] buf, int start, |
| int count) { |
| if (count > 4) { |
| throw new IllegalArgumentException( |
| "Cannot handle more than 4 bytes"); |
| } |
| |
| int answer = 0; |
| |
| for (int i = 0; i < count; i++) { |
| answer <<= 8; |
| answer |= ((int)buf[start+i] & 0xff); |
| } |
| return answer; |
| } |
| |
| /** |
| * Encodes an integer into 4 bytes in network byte order in the buffer |
| * supplied. |
| */ |
| private static final void intToNetworkByteOrder(int num, byte[] buf, |
| int start, int count) { |
| if (count > 4) { |
| throw new IllegalArgumentException( |
| "Cannot handle more than 4 bytes"); |
| } |
| |
| for (int i = count-1; i >= 0; i--) { |
| buf[start+i] = (byte)(num & 0xff); |
| num >>>= 8; |
| } |
| } |
| } |