/*
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* 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.
*
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package com.sun.jmx.snmp.IPAcl;
import static com.sun.jmx.defaults.JmxProperties.SNMP_LOGGER;
import java.util.logging.Level;
import java.util.Vector;
import java.util.Enumeration;
import java.io.Serializable;
import java.net.UnknownHostException;
import java.net.InetAddress;
import java.security.Principal;
import java.security.acl.Group;
/**
* This class is used to represent a subnet mask (a group of hosts matching the same
* IP mask).
*
* @see java.security.acl.Group
*/
class NetMaskImpl extends PrincipalImpl implements Group, Serializable {
private static final long serialVersionUID = -7332541893877932896L;
protected byte[] subnet = null;
protected int prefix = -1;
/**
* Constructs an empty group.
* @exception UnknownHostException Not implemented
*/
public NetMaskImpl () throws UnknownHostException {
}
private byte[] extractSubNet(byte[] b) {
int addrLength = b.length;
byte[] subnet = null;
if (SNMP_LOGGER.isLoggable(Level.FINEST)) {
SNMP_LOGGER.logp(Level.FINEST, NetMaskImpl.class.getName(),
"extractSubNet", "BINARY ARRAY :");
StringBuffer buff = new StringBuffer();
for(int i =0; i < addrLength; i++) {
buff.append((b[i] &0xFF) +":");
}
SNMP_LOGGER.logp(Level.FINEST, NetMaskImpl.class.getName(),
"extractSubNet", buff.toString());
}
// 8 is a byte size. Common to any InetAddress (V4 or V6).
int fullyCoveredByte = prefix / 8;
if(fullyCoveredByte == addrLength) {
if (SNMP_LOGGER.isLoggable(Level.FINEST)) {
SNMP_LOGGER.logp(Level.FINEST, NetMaskImpl.class.getName(), "extractSubNet",
"The mask is the complete address, strange..." + addrLength);
}
subnet = b;
return subnet;
}
if(fullyCoveredByte > addrLength) {
if (SNMP_LOGGER.isLoggable(Level.FINEST)) {
SNMP_LOGGER.logp(Level.FINEST, NetMaskImpl.class.getName(), "extractSubNet",
"The number of covered byte is longer than the address. BUG");
}
throw new IllegalArgumentException("The number of covered byte is longer than the address.");
}
int partialyCoveredIndex = fullyCoveredByte;
if (SNMP_LOGGER.isLoggable(Level.FINEST)) {
SNMP_LOGGER.logp(Level.FINEST, NetMaskImpl.class.getName(), "extractSubNet",
"Partially covered index : " + partialyCoveredIndex);
}
byte toDeal = b[partialyCoveredIndex];
if (SNMP_LOGGER.isLoggable(Level.FINEST)) {
SNMP_LOGGER.logp(Level.FINEST, NetMaskImpl.class.getName(), "extractSubNet",
"Partially covered byte : " + toDeal);
}
// 8 is a byte size. Common to any InetAddress (V4 or V6).
int nbbits = prefix % 8;
int subnetSize = 0;
if(nbbits == 0)
subnetSize = partialyCoveredIndex;
else
subnetSize = partialyCoveredIndex + 1;
if (SNMP_LOGGER.isLoggable(Level.FINEST)) {
SNMP_LOGGER.logp(Level.FINEST, NetMaskImpl.class.getName(), "extractSubNet",
"Remains : " + nbbits);
}
byte mask = 0;
for(int i = 0; i < nbbits; i++) {
mask |= (1 << (7 - i));
}
if (SNMP_LOGGER.isLoggable(Level.FINEST)) {
SNMP_LOGGER.logp(Level.FINEST, NetMaskImpl.class.getName(), "extractSubNet",
"Mask value : " + (mask & 0xFF));
}
byte maskedValue = (byte) ((int)toDeal & (int)mask);
if (SNMP_LOGGER.isLoggable(Level.FINEST)) {
SNMP_LOGGER.logp(Level.FINEST, NetMaskImpl.class.getName(), "extractSubNet",
"Masked byte : " + (maskedValue &0xFF));
}
subnet = new byte[subnetSize];
if (SNMP_LOGGER.isLoggable(Level.FINEST)) {
SNMP_LOGGER.logp(Level.FINEST, NetMaskImpl.class.getName(), "extractSubNet",
"Resulting subnet : ");
}
for(int i = 0; i < partialyCoveredIndex; i++) {
subnet[i] = b[i];
if (SNMP_LOGGER.isLoggable(Level.FINEST)) {
SNMP_LOGGER.logp(Level.FINEST, NetMaskImpl.class.getName(), "extractSubNet",
(subnet[i] & 0xFF) +":");
}
}
if(nbbits != 0) {
subnet[partialyCoveredIndex] = maskedValue;
if (SNMP_LOGGER.isLoggable(Level.FINEST)) {
SNMP_LOGGER.logp(Level.FINEST, NetMaskImpl.class.getName(), "extractSubNet",
"Last subnet byte : " + (subnet[partialyCoveredIndex] &0xFF));
}
}
return subnet;
}
/**
* Constructs a group using the specified subnet mask.
* THIS ALGORITHM IS V4 and V6 compatible.
*
* @exception UnknownHostException if the subnet mask cann't be built.
*/
public NetMaskImpl (String a, int prefix) throws UnknownHostException {
super(a);
this.prefix = prefix;
subnet = extractSubNet(getAddress().getAddress());
}
/**
* Adds the specified member to the group.
*
* @param p the principal to add to this group.
* @return true if the member was successfully added, false if the
* principal was already a member.
*/
public boolean addMember(Principal p) {
// we don't need to add members because the ip address is a subnet mask
return true;
}
public int hashCode() {
return super.hashCode();
}
/**
* Compares this group to the specified object. Returns true if the object
* passed in matches the group represented.
*
* @param p the object to compare with.
* @return true if the object passed in matches the subnet mask,
* false otherwise.
*/
public boolean equals (Object p) {
if (p instanceof PrincipalImpl || p instanceof NetMaskImpl){
PrincipalImpl received = (PrincipalImpl) p;
InetAddress addr = received.getAddress();
if (SNMP_LOGGER.isLoggable(Level.FINEST)) {
SNMP_LOGGER.logp(Level.FINEST, NetMaskImpl.class.getName(), "equals",
"Received Address : " + addr);
}
byte[] recAddr = addr.getAddress();
for(int i = 0; i < subnet.length; i++) {
if (SNMP_LOGGER.isLoggable(Level.FINEST)) {
SNMP_LOGGER.logp(Level.FINEST, NetMaskImpl.class.getName(), "equals",
"(recAddr[i]) : " + (recAddr[i] & 0xFF));
SNMP_LOGGER.logp(Level.FINEST, NetMaskImpl.class.getName(), "equals",
"(recAddr[i] & subnet[i]) : " +
((recAddr[i] & (int)subnet[i]) &0xFF) +
" subnet[i] : " + (subnet[i] &0xFF));
}
if((recAddr[i] & subnet[i]) != subnet[i]) {
if (SNMP_LOGGER.isLoggable(Level.FINEST)) {
SNMP_LOGGER.logp(Level.FINEST, NetMaskImpl.class.getName(), "equals",
"FALSE");
}
return false;
}
}
if (SNMP_LOGGER.isLoggable(Level.FINEST)) {
SNMP_LOGGER.logp(Level.FINEST, NetMaskImpl.class.getName(), "equals",
"TRUE");
}
return true;
} else
return false;
}
/**
* Returns true if the passed principal is a member of the group.
*
* @param p the principal whose membership is to be checked.
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