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/*
* Copyright (c) 2000, 2019, 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 sun.misc.IOUtils;
import java.io.*;
import java.net.*;
public abstract class NetClient implements AutoCloseable {
public static NetClient getInstance(String protocol, String hostname, int port,
int timeout) throws IOException {
if (protocol.equals("TCP")) {
return new TCPClient(hostname, port, timeout);
} else {
return new UDPClient(hostname, port, timeout);
}
}
abstract public void send(byte[] data) throws IOException;
abstract public byte[] receive() throws IOException;
abstract public void close() throws IOException;
}
class TCPClient extends NetClient {
private Socket tcpSocket;
private BufferedOutputStream out;
private BufferedInputStream in;
TCPClient(String hostname, int port, int timeout)
throws IOException {
tcpSocket = new Socket();
tcpSocket.connect(new InetSocketAddress(hostname, port), timeout);
out = new BufferedOutputStream(tcpSocket.getOutputStream());
in = new BufferedInputStream(tcpSocket.getInputStream());
tcpSocket.setSoTimeout(timeout);
}
@Override
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();
}
@Override
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;
}
try {
return IOUtils.readExactlyNBytes(in, len);
} catch (IOException ioe) {
if (Krb5.DEBUG) {
System.out.println(
">>>DEBUG: TCPClient could not read complete packet (" +
len + "/" + count + ")");
}
return null;
}
}
@Override
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 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 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;
}
}
}
class UDPClient extends NetClient {
InetAddress iaddr;
int iport;
int bufSize = 65507;
DatagramSocket dgSocket;
DatagramPacket dgPacketIn;
UDPClient(String hostname, int port, int timeout)
throws UnknownHostException, SocketException {
iaddr = InetAddress.getByName(hostname);
iport = port;
dgSocket = new DatagramSocket();
dgSocket.setSoTimeout(timeout);
dgSocket.connect(iaddr, iport);
}
@Override
public void send(byte[] data) throws IOException {
DatagramPacket dgPacketOut = new DatagramPacket(data, data.length,
iaddr, iport);
dgSocket.send(dgPacketOut);
}
@Override
public byte[] receive() throws IOException {
byte ibuf[] = new byte[bufSize];
dgPacketIn = new DatagramPacket(ibuf, ibuf.length);
try {
dgSocket.receive(dgPacketIn);
}
catch (SocketException e) {
if (e instanceof PortUnreachableException) {
throw e;
}
dgSocket.receive(dgPacketIn);
}
byte[] data = new byte[dgPacketIn.getLength()];
System.arraycopy(dgPacketIn.getData(), 0, data, 0,
dgPacketIn.getLength());
return data;
}
@Override
public void close() {
dgSocket.close();
}
}
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