/*
* Copyright 2009-2014 Jagornet Technologies, LLC. All Rights Reserved.
*
* This software is the proprietary information of Jagornet Technologies, LLC.
* Use is subject to license terms.
*
*/
/*
* This file OpaqueDataUtil.java is part of Jagornet DHCP.
*
* Jagornet DHCP is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Jagornet DHCP 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 for more details.
*
* You should have received a copy of the GNU General Public License
* along with Jagornet DHCP. If not, see <http://www.gnu.org/licenses/>.
*
*/
package com.jagornet.dhcp.option;
import java.net.NetworkInterface;
import java.nio.ByteBuffer;
import java.util.Arrays;
import java.util.Enumeration;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.jagornet.dhcp.option.base.BaseOpaqueData;
import com.jagornet.dhcp.util.Util;
import com.jagornet.dhcp.xml.OpaqueData;
import com.jagornet.dhcp.xml.OpaqueDataOptionType;
import com.jagornet.dhcp.xml.Operator;
import com.jagornet.dhcp.xml.OptionExpression;
/**
* <p>Title: OpaqueDataUtil </p>
* <p>Description: Utility class for handling OpaqueData objects.</p>
*
* @author A. Gregory Rabil
*/
public class OpaqueDataUtil
{
/** The log. */
private static Logger log = LoggerFactory.getLogger(OpaqueDataUtil.class);
/**
* Matches.
*
* @param expression the expression
* @param myOpaque the my opaque
*
* @return true, if successful
*/
public static boolean matches(OptionExpression expression, BaseOpaqueData myOpaque)
{
if (expression == null)
return false;
OpaqueDataOptionType opaqueOption = expression.getOpaqueDataOption();
if (opaqueOption == null)
return false;
Operator.Enum op = expression.getOperator();
return matches(myOpaque, opaqueOption.getOpaqueData(), op);
}
public static boolean matches(BaseOpaqueData myOpaque, OpaqueData that, Operator.Enum op)
{
if (that != null) {
String expAscii = that.getAsciiValue();
String myAscii = myOpaque.getAscii();
if ( (expAscii != null) && (myAscii != null) ) {
if (op.equals(Operator.EQUALS)) {
return myAscii.equalsIgnoreCase(expAscii);
}
else if (op.equals(Operator.STARTS_WITH)) {
return myAscii.startsWith(expAscii);
}
else if (op.equals(Operator.CONTAINS)) {
return myAscii.contains(expAscii);
}
else if (op.equals(Operator.ENDS_WITH)) {
return myAscii.endsWith(expAscii);
}
else if (op.equals(Operator.REG_EXP)) {
return myAscii.matches(expAscii);
}
else {
log.error("Unsupported expression operator: " + op);
return false;
}
}
else if ( (expAscii == null) && (myAscii == null) ) {
byte[] expHex = that.getHexValue();
byte[] myHex = myOpaque.getHex();
if ( (expHex != null) && (myHex != null) ) {
if (op.equals(Operator.EQUALS)) {
return Arrays.equals(myHex, expHex);
}
else if (op.equals(Operator.STARTS_WITH)) {
if (myHex.length >= expHex.length) {
for (int i=0; i<expHex.length; i++) {
if (myHex[i] != expHex[i]) {
return false;
}
}
return true; // if we get here, it matches
}
else {
return false; // exp length too long
}
}
else if (op.equals(Operator.CONTAINS)) {
if (myHex.length >= expHex.length) {
int j=0;
for (int i=0; i<myHex.length; i++) {
if (myHex[i] == expHex[j]) {
// found a potential match
j++;
boolean matches = true;
for (int ii=i+1; ii<myHex.length; ii++) {
if (myHex[ii] != expHex[j++]) {
matches = false;
break;
}
}
if (matches) {
return true;
}
j=0; // reset to start of exp
}
}
return false; // if we get here, it didn't match
}
else {
return false; // exp length too long
}
}
else if (op.equals(Operator.ENDS_WITH)) {
if (myHex.length >= expHex.length) {
for (int i=myHex.length-1;
i>=myHex.length-expHex.length;
i--) {
if (myHex[i] != expHex[i]) {
return false;
}
}
return true; // if we get here, it matches
}
else {
return false; // exp length too long
}
}
else if (op.equals(Operator.REG_EXP)) {
log.error("Regular expression operator not valid for hex opaque opaqueData");
return false;
}
else {
log.error("Unsupported expression operator: " + op);
return false;
}
}
}
}
return false;
}
/**
* To string.
*
* @param opaque the opaque
*
* @return the string
*/
public static String toString(OpaqueData opaque)
{
if (opaque == null)
return null;
String ascii = opaque.getAsciiValue();
if (ascii != null)
return ascii;
else
return Util.toHexString(opaque.getHexValue());
}
/**
* Equals.
*
* @param opaque1 the opaque1
* @param opaque2 the opaque2
*
* @return true, if successful
*/
public static boolean equals(BaseOpaqueData opaque1, BaseOpaqueData opaque2)
{
if ( (opaque1 == null) || (opaque2 == null) )
return false;
String ascii1 = opaque1.getAscii();
if (ascii1 != null) {
String ascii2 = opaque2.getAscii();
if (ascii1.equalsIgnoreCase(ascii2)) {
return true;
}
}
else {
return Arrays.equals(opaque1.getHex(), opaque2.getHex());
}
return false;
}
/**
* Generate the DHCPv6 Server's DUID-LLT. See sections 9 and 22.3 of RFC 3315.
*
* @return the opaque opaqueData
*/
public static OpaqueData generateDUID_LLT()
{
OpaqueData opaque = null;
try {
Enumeration<NetworkInterface> intfs = NetworkInterface.getNetworkInterfaces();
if (intfs != null) {
while (intfs.hasMoreElements()) {
NetworkInterface intf = intfs.nextElement();
if (intf.isUp() && !intf.isLoopback() && !intf.isPointToPoint() && !intf.isVirtual()) {
opaque = OpaqueData.Factory.newInstance();
ByteBuffer bb = ByteBuffer.allocate(intf.getHardwareAddress().length + 8);
bb.putShort((short)1); // DUID based on LLT
bb.putShort((short)1); // assume ethernet
bb.putInt((int)(System.currentTimeMillis()/1000)); // seconds since the Epoch
bb.put(intf.getHardwareAddress());
opaque.setHexValue(bb.array());
break;
}
}
}
}
catch (Exception ex) {
log.error("Failed to generate DUID-LLT: " + ex);
}
return opaque;
}
/**
* The main method.
*
* @param args the arguments
*/
public static void main(String[] args)
{
/*
OpaqueData o1 = OpaqueData.Factory.newInstance();
OpaqueData o2 = OpaqueData.Factory.newInstance();
o1.setHexValue(new byte[] { (byte)0xde, (byte)0xbb, (byte)0x1e });
o2.setHexValue(new byte[] { (byte)0xde, (byte)0xbb, (byte)0x1e });
System.out.println(equals(o1,o2));
*/
OpaqueData opaque = generateDUID_LLT();
System.out.println(OpaqueDataUtil.toString(opaque));
}
}