/* * 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 :");            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.   * @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<? extends Principal> members(){        Vector<Principal> v = new Vector<Principal>(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);  } }