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/*
 *
 *  (C) Copyright IBM Corp. 1999 All Rights Reserved.
 *  Copyright 1997 The Open Group Research Institute.  All rights reserved.
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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. HostAddress ::= SEQUENCE { addr-type [0] Int32, address [1] OCTET STRING }

This definition reflects the Network Working Group RFC 4120 specification available at http://www.ietf.org/rfc/rfc4120.txt.

/** * 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.
Throws:
  • if no IP address for the host could be found. –
Returns:the IP address for this specified host.
/** * 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.
Params:
  • new_addrType – the value of the address type which matches the defined address family constants in the Berkeley Standard Distributions of Unix.
  • new_address – network address.
Throws:
/** * 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.
Params:
  • encoding – a single DER-encoded value.
Throws:
  • Asn1Exception – if an error occurs while decoding an ASN1 encoded data.
  • IOException – if an I/O error occurs while reading encoded data.
/** * 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.
Throws:
  • Asn1Exception – if an error occurs while decoding an ASN1 encoded data.
  • IOException – if an I/O error occurs while reading encoded data.
Returns:a byte array of encoded HostAddress object.
/** * 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.
Params:
  • data – the Der input stream value, which contains one or more marshaled value.
  • explicitTag – tag number.
  • optional – indicates if this data field is optional
Throws:
  • Asn1Exception – on error.
  • IOException – if an I/O error occurs while reading encoded data.
Returns:an instance of HostAddress.
/** * 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(); } }