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	/*
	* Copyright (c) 2000, 2011, 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.PrincipalName;
	import sun.security.krb5.KrbException;
	import sun.security.krb5.Asn1Exception;
	import sun.security.util.*;

	import java.net.*;
	import java.util.*;
	import java.io.IOException;
	import sun.security.krb5.internal.ccache.CCacheOutputStream;

	/**
	* Implements the ASN.1 HostAddresses type.
	*
	* <pre>{@code
	* HostAddresses -- NOTE: subtly different from rfc1510,
	* -- but has a value mapping and encodes the same
	* ::= SEQUENCE OF HostAddress
	*
	* 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 HostAddresses implements Cloneable {
	private static boolean DEBUG = sun.security.krb5.internal.Krb5.DEBUG;
	private HostAddress[] addresses = null;
	private volatile int hashCode = 0;

	public HostAddresses(HostAddress[] new_addresses) throws IOException {
	if (new_addresses != null) {
	addresses = new HostAddress[new_addresses.length];
	for (int i = 0; i < new_addresses.length; i++) {
	if (new_addresses[i] == null) {
	throw new IOException("Cannot create a HostAddress");
	} else {
	addresses[i] = (HostAddress)new_addresses[i].clone();
	}
	}
	}
	}

	public HostAddresses() throws UnknownHostException {
	addresses = new HostAddress[1];
	addresses[0] = new HostAddress();
	}

	private HostAddresses(int dummy) {}

	public HostAddresses(PrincipalName serverPrincipal)
	throws UnknownHostException, KrbException {

	String[] components = serverPrincipal.getNameStrings();

	if (serverPrincipal.getNameType() != PrincipalName.KRB_NT_SRV_HST \|\|
	components.length < 2)
	throw new KrbException(Krb5.KRB_ERR_GENERIC, "Bad name");

	String host = components[1];
	InetAddress addr[] = InetAddress.getAllByName(host);
	HostAddress hAddrs[] = new HostAddress[addr.length];

	for (int i = 0; i < addr.length; i++) {
	hAddrs[i] = new HostAddress(addr[i]);
	}

	addresses = hAddrs;
	}

	public Object clone() {
	HostAddresses new_hostAddresses = new HostAddresses(0);
	if (addresses != null) {
	new_hostAddresses.addresses = new HostAddress[addresses.length];
	for (int i = 0; i < addresses.length; i++) {
	new_hostAddresses.addresses[i] =
	(HostAddress)addresses[i].clone();
	}
	}
	return new_hostAddresses;
	}

	public boolean inList(HostAddress addr) {
	if (addresses != null) {
	for (int i = 0; i < addresses.length; i++)
	if (addresses[i].equals(addr))
	return true;
	}
	return false;
	}

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

	}


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

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

	HostAddresses addrs = (HostAddresses)obj;
	if ((addresses == null && addrs.addresses != null) \|\|
	(addresses != null && addrs.addresses == null))
	return false;
	if (addresses != null && addrs.addresses != null) {
	if (addresses.length != addrs.addresses.length)
	return false;
	for (int i = 0; i < addresses.length; i++)
	if (!addresses[i].equals(addrs.addresses[i]))
	return false;
	}
	return true;
	}

	/**
	* Constructs a new <code>HostAddresses</code> object.
	* @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 HostAddresses(DerValue encoding)
	throws Asn1Exception, IOException {
	Vector<HostAddress> tempAddresses = new Vector<>();
	DerValue der = null;
	while (encoding.getData().available() > 0) {
	der = encoding.getData().getDerValue();
	tempAddresses.addElement(new HostAddress(der));
	}
	if (tempAddresses.size() > 0) {
	addresses = new HostAddress[tempAddresses.size()];
	tempAddresses.copyInto(addresses);
	}
	}


	/**
	* Encodes a <code>HostAddresses</code> object.
	* @return byte array of encoded <code>HostAddresses</code> 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();

	if (addresses != null && addresses.length > 0) {
	for (int i = 0; i < addresses.length; i++)
	bytes.write(addresses[i].asn1Encode());
	}
	temp.write(DerValue.tag_Sequence, bytes);
	return temp.toByteArray();
	}

	/**
	* Parse (unmarshal) a <code>HostAddresses</code> 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 if an Asn1Exception occurs.
	* @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 <code>HostAddresses</code>.
	*/
	public static HostAddresses 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 HostAddresses(subDer);
	}
	}

	/**
	* Writes data field values in <code>HostAddresses</code> in FCC
	* format to a <code>CCacheOutputStream</code>.
	*
	* @param cos a <code>CCacheOutputStream</code> to be written to.
	* @exception IOException if an I/O exception occurs.
	* @see sun.security.krb5.internal.ccache.CCacheOutputStream
	*/

	public void writeAddrs(CCacheOutputStream cos) throws IOException {
	if (addresses == null \|\| addresses.length == 0) {
	cos.write32(0);
	return;
	}
	cos.write32(addresses.length);
	for (int i = 0; i < addresses.length; i++) {
	cos.write16(addresses[i].addrType);
	cos.write32(addresses[i].address.length);
	cos.write(addresses[i].address, 0,
	addresses[i].address.length);
	}
	}


	public InetAddress[] getInetAddresses() {

	if (addresses == null \|\| addresses.length == 0)
	return null;

	ArrayList<InetAddress> ipAddrs = new ArrayList<>(addresses.length);

	for (int i = 0; i < addresses.length; i++) {
	try {
	if ((addresses[i].addrType == Krb5.ADDRTYPE_INET) \|\|
	(addresses[i].addrType == Krb5.ADDRTYPE_INET6)) {
	ipAddrs.add(addresses[i].getInetAddress());
	}
	} catch (java.net.UnknownHostException e) {
	// Should not happen since IP address given
	return null;
	}
	}

	InetAddress[] retVal = new InetAddress[ipAddrs.size()];
	return ipAddrs.toArray(retVal);

	}

	/**
	* Returns all the IP addresses of the local host.
	*/
	public static HostAddresses getLocalAddresses() throws IOException
	{
	Set<InetAddress> all = new LinkedHashSet<>();
	try {
	if (DEBUG) {
	System.out.println(">>> KrbKdcReq local addresses are:");
	}
	String extra = Config.getInstance().getAll(
	"libdefaults", "extra_addresses");
	if (extra != null) {
	for (String s: extra.split("\\s+")) {
	all.add(InetAddress.getByName(s));
	if (DEBUG) {
	System.out.println(" extra_addresses: "
	+ InetAddress.getByName(s));
	}
	}
	}
	for (NetworkInterface ni:
	Collections.list(NetworkInterface.getNetworkInterfaces())) {
	if (DEBUG) {
	System.out.println(" NetworkInterface " + ni + ":");
	System.out.println(" "
	+ Collections.list(ni.getInetAddresses()));
	}
	all.addAll(Collections.list(ni.getInetAddresses()));
	}
	return new HostAddresses(all.toArray(new InetAddress[all.size()]));
	} catch (Exception exc) {
	throw new IOException(exc.toString());
	}
	}

	/**
	* Creates a new HostAddresses instance from the supplied list
	* of InetAddresses.
	*/
	public HostAddresses(InetAddress[] inetAddresses)
	{
	if (inetAddresses == null)
	{
	addresses = null;
	return;
	}

	addresses = new HostAddress[inetAddresses.length];
	for (int i = 0; i < inetAddresses.length; i++)
	addresses[i] = new HostAddress(inetAddresses[i]);
	}

	@Override
	public String toString() {
	return Arrays.toString(addresses);
	}
	}

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