/* * 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; /** * Implements the ASN.1 HostAddress type. * * <xmp> * HostAddress     ::= SEQUENCE  { *         addr-type       [0] Int32, *         address         [1] OCTET STRING * } * </xmp> * * <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 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);        }    } }