/* * Copyright (c) 2002, 2007, 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. */ 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 :"); StringBuilder sb = new StringBuilder(); for(int i =0; i < addrLength; i++) { sb.append(b[i] & 0xFF).append(':'); } SNMP_LOGGER.logp(Level.FINEST, NetMaskImpl.class.getName(), "extractSubNet", sb.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. * @return true if the principal is a member of this group, false otherwise. */ public boolean isMember(Principal p) { if ((p.hashCode() & super.hashCode()) == p.hashCode()) return true; else return false; } /** * Returns an enumeration which contains the subnet mask. * * @return an enumeration which contains the subnet mask. */ public Enumeration members(){ Vector v = new Vector(1); v.addElement(this); return v.elements(); } /** * Removes the specified member from the group. (Not implemented) * * @param p the principal to remove from this group. * @return allways return true. */ public boolean removeMember(Principal p) { return true; } /** * Prints a string representation of this group. * * @return a string representation of this group. */ public String toString() { return ("NetMaskImpl :"+ super.getAddress().toString() + "/" + prefix); } }