Back to index...

	/*
	* Copyright (c) 2000, 2006, 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.security.krb5.Config;
	import sun.security.krb5.Asn1Exception;
	import sun.security.util.*;
	import java.net.InetAddress;
	import java.net.Inet4Address;
	import java.net.Inet6Address;
	import java.net.UnknownHostException;
	import java.io.IOException;
	import java.util.Arrays;

	/**
	* Implements the ASN.1 HostAddress type.
	*
	* <pre>{@code
	* HostAddress ::= SEQUENCE {
	* addr-type [0] Int32,
	* address [1] OCTET STRING
	* }
	* }</pre>
	*
	* <p>
	* This definition reflects the Network Working Group RFC 4120
	* specification available at
	* <a href="http://www.ietf.org/rfc/rfc4120.txt">
	* http://www.ietf.org/rfc/rfc4120.txt</a>.
	*/

	public class HostAddress implements Cloneable {
	int addrType;
	byte[] address = null;

	private static InetAddress localInetAddress; //caches local inet address
	private static final boolean DEBUG = sun.security.krb5.internal.Krb5.DEBUG;
	private volatile int hashCode = 0;

	private HostAddress(int dummy) {}

	public Object clone() {
	HostAddress new_hostAddress = new HostAddress(0);
	new_hostAddress.addrType = addrType;
	if (address != null) {
	new_hostAddress.address = address.clone();
	}
	return new_hostAddress;
	}


	public int hashCode() {
	if (hashCode == 0) {
	int result = 17;
	result = 37*result + addrType;
	if (address != null) {
	for (int i=0; i < address.length; i++) {
	result = 37*result + address[i];
	}
	}
	hashCode = result;
	}
	return hashCode;

	}

	public boolean equals(Object obj) {
	if (this == obj) {
	return true;
	}

	if (!(obj instanceof HostAddress)) {
	return false;
	}

	HostAddress h = (HostAddress)obj;
	if (addrType != h.addrType \|\|
	(address != null && h.address == null) \|\|
	(address == null && h.address != null))
	return false;
	if (address != null && h.address != null) {
	if (address.length != h.address.length)
	return false;
	for (int i = 0; i < address.length; i++)
	if (address[i] != h.address[i])
	return false;
	}
	return true;
	}

	private static synchronized InetAddress getLocalInetAddress()
	throws UnknownHostException {

	if (localInetAddress == null) {
	localInetAddress = InetAddress.getLocalHost();
	}
	if (localInetAddress == null) {
	throw new UnknownHostException();
	}
	return (localInetAddress);
	}

	/**
	* Gets the InetAddress of this HostAddress.
	* @return the IP address for this specified host.
	* @exception UnknownHostException if no IP address for the host could be found.
	*
	*/
	public InetAddress getInetAddress() throws UnknownHostException {
	// the type of internet addresses is 2.
	if (addrType == Krb5.ADDRTYPE_INET \|\|
	addrType == Krb5.ADDRTYPE_INET6) {
	return (InetAddress.getByAddress(address));
	} else {
	// if it is other type (ISO address, XNS address, etc)
	return null;
	}
	}

	private int getAddrType(InetAddress inetAddress) {
	int addressType = 0;
	if (inetAddress instanceof Inet4Address)
	addressType = Krb5.ADDRTYPE_INET;
	else if (inetAddress instanceof Inet6Address)
	addressType = Krb5.ADDRTYPE_INET6;
	return (addressType);
	}

	// implicit default not in Config.java
	public HostAddress() throws UnknownHostException {
	InetAddress inetAddress = getLocalInetAddress();
	addrType = getAddrType(inetAddress);
	address = inetAddress.getAddress();
	}

	/**
	* Creates a HostAddress from the specified address and address type.
	*
	* @param new_addrType the value of the address type which matches the defined
	* address family constants in the Berkeley Standard
	* Distributions of Unix.
	* @param new_address network address.
	* @exception KrbApErrException if address type and address length do not match defined value.
	*
	*/
	public HostAddress(int new_addrType, byte[] new_address)
	throws KrbApErrException, UnknownHostException {
	switch(new_addrType) {
	case Krb5.ADDRTYPE_INET: //Internet address
	if (new_address.length != 4)
	throw new KrbApErrException(0, "Invalid Internet address");
	break;
	case Krb5.ADDRTYPE_CHAOS:
	if (new_address.length != 2) //CHAOSnet address
	throw new KrbApErrException(0, "Invalid CHAOSnet address");
	break;
	case Krb5.ADDRTYPE_ISO: // ISO address
	break;
	case Krb5.ADDRTYPE_IPX: // XNS address
	if (new_address.length != 6)
	throw new KrbApErrException(0, "Invalid XNS address");
	break;
	case Krb5.ADDRTYPE_APPLETALK: //AppleTalk DDP address
	if (new_address.length != 3)
	throw new KrbApErrException(0, "Invalid DDP address");
	break;
	case Krb5.ADDRTYPE_DECNET: //DECnet Phase IV address
	if (new_address.length != 2)
	throw new KrbApErrException(0, "Invalid DECnet Phase IV address");
	break;
	case Krb5.ADDRTYPE_INET6: //Internet IPv6 address
	if (new_address.length != 16)
	throw new KrbApErrException(0, "Invalid Internet IPv6 address");
	break;
	}

	addrType = new_addrType;
	if (new_address != null) {
	address = new_address.clone();
	}
	if (DEBUG) {
	if (addrType == Krb5.ADDRTYPE_INET \|\|
	addrType == Krb5.ADDRTYPE_INET6) {
	System.out.println("Host address is " +
	InetAddress.getByAddress(address));
	}
	}
	}

	public HostAddress(InetAddress inetAddress) {
	addrType = getAddrType(inetAddress);
	address = inetAddress.getAddress();
	}

	/**
	* Constructs a host address from a single DER-encoded value.
	* @param encoding a single DER-encoded value.
	* @exception Asn1Exception if an error occurs while decoding an ASN1 encoded data.
	* @exception IOException if an I/O error occurs while reading encoded data.
	*
	*/
	public HostAddress(DerValue encoding) throws Asn1Exception, IOException {
	DerValue der = encoding.getData().getDerValue();
	if ((der.getTag() & (byte)0x1F) == (byte)0x00) {
	addrType = der.getData().getBigInteger().intValue();
	}
	else
	throw new Asn1Exception(Krb5.ASN1_BAD_ID);
	der = encoding.getData().getDerValue();
	if ((der.getTag() & (byte)0x1F) == (byte)0x01) {
	address = der.getData().getOctetString();
	}
	else
	throw new Asn1Exception(Krb5.ASN1_BAD_ID);
	if (encoding.getData().available() > 0)
	throw new Asn1Exception(Krb5.ASN1_BAD_ID);
	}

	/**
	* Encodes a HostAddress object.
	* @return a byte array of encoded HostAddress object.
	* @exception Asn1Exception if an error occurs while decoding an ASN1 encoded data.
	* @exception IOException if an I/O error occurs while reading encoded data.
	*
	*/

	public byte[] asn1Encode() throws Asn1Exception, IOException {
	DerOutputStream bytes = new DerOutputStream();
	DerOutputStream temp = new DerOutputStream();
	temp.putInteger(this.addrType);
	bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x00), temp);
	temp = new DerOutputStream();
	temp.putOctetString(address);
	bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x01), temp);
	temp = new DerOutputStream();
	temp.write(DerValue.tag_Sequence, bytes);
	return temp.toByteArray();
	}

	/**
	* Parses (unmarshal) a host address from a DER input stream. This form
	* parsing might be used when expanding a value which is part of
	* a constructed sequence and uses explicitly tagged type.
	*
	* @exception Asn1Exception on error.
	* @exception IOException if an I/O error occurs while reading encoded data.
	* @param data the Der input stream value, which contains one or more marshaled value.
	* @param explicitTag tag number.
	* @param optional indicates if this data field is optional
	* @return an instance of HostAddress.
	*
	*/
	public static HostAddress parse(DerInputStream data, byte explicitTag,
	boolean optional)
	throws Asn1Exception, IOException{
	if ((optional) &&
	(((byte)data.peekByte() & (byte)0x1F) != explicitTag)) {
	return null;
	}
	DerValue der = data.getDerValue();
	if (explicitTag != (der.getTag() & (byte)0x1F)) {
	throw new Asn1Exception(Krb5.ASN1_BAD_ID);
	}
	else {
	DerValue subDer = der.getData().getDerValue();
	return new HostAddress(subDer);
	}
	}

	@Override
	public String toString() {
	StringBuilder sb = new StringBuilder();
	sb.append(Arrays.toString(address));
	sb.append('(').append(addrType).append(')');
	return sb.toString();
	}
	}

Back to index...