| /* |
| * 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); |
| } |
| |
| } |