J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2002-2007 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package com.sun.jmx.snmp.IPAcl; |
| 27 | |
| 28 | import static com.sun.jmx.defaults.JmxProperties.SNMP_LOGGER; |
| 29 | |
| 30 | import java.util.logging.Level; |
| 31 | import java.util.Vector; |
| 32 | import java.util.Enumeration; |
| 33 | import java.io.Serializable; |
| 34 | import java.net.UnknownHostException; |
| 35 | import java.net.InetAddress; |
| 36 | |
| 37 | import java.security.Principal; |
| 38 | import java.security.acl.Group; |
| 39 | |
| 40 | |
| 41 | /** |
| 42 | * This class is used to represent a subnet mask (a group of hosts matching the same |
| 43 | * IP mask). |
| 44 | * |
| 45 | * @see java.security.acl.Group |
| 46 | */ |
| 47 | |
| 48 | class NetMaskImpl extends PrincipalImpl implements Group, Serializable { |
| 49 | private static final long serialVersionUID = -7332541893877932896L; |
| 50 | |
| 51 | protected byte[] subnet = null; |
| 52 | protected int prefix = -1; |
| 53 | /** |
| 54 | * Constructs an empty group. |
| 55 | * @exception UnknownHostException Not implemented |
| 56 | */ |
| 57 | public NetMaskImpl () throws UnknownHostException { |
| 58 | } |
| 59 | |
| 60 | private byte[] extractSubNet(byte[] b) { |
| 61 | int addrLength = b.length; |
| 62 | byte[] subnet = null; |
| 63 | if (SNMP_LOGGER.isLoggable(Level.FINEST)) { |
| 64 | SNMP_LOGGER.logp(Level.FINEST, NetMaskImpl.class.getName(), |
| 65 | "extractSubNet", "BINARY ARRAY :"); |
| 66 | StringBuffer buff = new StringBuffer(); |
| 67 | for(int i =0; i < addrLength; i++) { |
| 68 | buff.append((b[i] &0xFF) +":"); |
| 69 | } |
| 70 | SNMP_LOGGER.logp(Level.FINEST, NetMaskImpl.class.getName(), |
| 71 | "extractSubNet", buff.toString()); |
| 72 | } |
| 73 | |
| 74 | // 8 is a byte size. Common to any InetAddress (V4 or V6). |
| 75 | int fullyCoveredByte = prefix / 8; |
| 76 | if(fullyCoveredByte == addrLength) { |
| 77 | if (SNMP_LOGGER.isLoggable(Level.FINEST)) { |
| 78 | SNMP_LOGGER.logp(Level.FINEST, NetMaskImpl.class.getName(), "extractSubNet", |
| 79 | "The mask is the complete address, strange..." + addrLength); |
| 80 | } |
| 81 | subnet = b; |
| 82 | return subnet; |
| 83 | } |
| 84 | if(fullyCoveredByte > addrLength) { |
| 85 | if (SNMP_LOGGER.isLoggable(Level.FINEST)) { |
| 86 | SNMP_LOGGER.logp(Level.FINEST, NetMaskImpl.class.getName(), "extractSubNet", |
| 87 | "The number of covered byte is longer than the address. BUG"); |
| 88 | } |
| 89 | throw new IllegalArgumentException("The number of covered byte is longer than the address."); |
| 90 | } |
| 91 | int partialyCoveredIndex = fullyCoveredByte; |
| 92 | if (SNMP_LOGGER.isLoggable(Level.FINEST)) { |
| 93 | SNMP_LOGGER.logp(Level.FINEST, NetMaskImpl.class.getName(), "extractSubNet", |
| 94 | "Partially covered index : " + partialyCoveredIndex); |
| 95 | } |
| 96 | byte toDeal = b[partialyCoveredIndex]; |
| 97 | if (SNMP_LOGGER.isLoggable(Level.FINEST)) { |
| 98 | SNMP_LOGGER.logp(Level.FINEST, NetMaskImpl.class.getName(), "extractSubNet", |
| 99 | "Partially covered byte : " + toDeal); |
| 100 | } |
| 101 | |
| 102 | // 8 is a byte size. Common to any InetAddress (V4 or V6). |
| 103 | int nbbits = prefix % 8; |
| 104 | int subnetSize = 0; |
| 105 | |
| 106 | if(nbbits == 0) |
| 107 | subnetSize = partialyCoveredIndex; |
| 108 | else |
| 109 | subnetSize = partialyCoveredIndex + 1; |
| 110 | |
| 111 | if (SNMP_LOGGER.isLoggable(Level.FINEST)) { |
| 112 | SNMP_LOGGER.logp(Level.FINEST, NetMaskImpl.class.getName(), "extractSubNet", |
| 113 | "Remains : " + nbbits); |
| 114 | } |
| 115 | |
| 116 | byte mask = 0; |
| 117 | for(int i = 0; i < nbbits; i++) { |
| 118 | mask |= (1 << (7 - i)); |
| 119 | } |
| 120 | if (SNMP_LOGGER.isLoggable(Level.FINEST)) { |
| 121 | SNMP_LOGGER.logp(Level.FINEST, NetMaskImpl.class.getName(), "extractSubNet", |
| 122 | "Mask value : " + (mask & 0xFF)); |
| 123 | } |
| 124 | |
| 125 | byte maskedValue = (byte) ((int)toDeal & (int)mask); |
| 126 | |
| 127 | if (SNMP_LOGGER.isLoggable(Level.FINEST)) { |
| 128 | SNMP_LOGGER.logp(Level.FINEST, NetMaskImpl.class.getName(), "extractSubNet", |
| 129 | "Masked byte : " + (maskedValue &0xFF)); |
| 130 | } |
| 131 | subnet = new byte[subnetSize]; |
| 132 | if (SNMP_LOGGER.isLoggable(Level.FINEST)) { |
| 133 | SNMP_LOGGER.logp(Level.FINEST, NetMaskImpl.class.getName(), "extractSubNet", |
| 134 | "Resulting subnet : "); |
| 135 | } |
| 136 | for(int i = 0; i < partialyCoveredIndex; i++) { |
| 137 | subnet[i] = b[i]; |
| 138 | |
| 139 | if (SNMP_LOGGER.isLoggable(Level.FINEST)) { |
| 140 | SNMP_LOGGER.logp(Level.FINEST, NetMaskImpl.class.getName(), "extractSubNet", |
| 141 | (subnet[i] & 0xFF) +":"); |
| 142 | } |
| 143 | } |
| 144 | |
| 145 | if(nbbits != 0) { |
| 146 | subnet[partialyCoveredIndex] = maskedValue; |
| 147 | if (SNMP_LOGGER.isLoggable(Level.FINEST)) { |
| 148 | SNMP_LOGGER.logp(Level.FINEST, NetMaskImpl.class.getName(), "extractSubNet", |
| 149 | "Last subnet byte : " + (subnet[partialyCoveredIndex] &0xFF)); |
| 150 | } |
| 151 | } |
| 152 | return subnet; |
| 153 | } |
| 154 | |
| 155 | /** |
| 156 | * Constructs a group using the specified subnet mask. |
| 157 | * THIS ALGORITHM IS V4 and V6 compatible. |
| 158 | * |
| 159 | * @exception UnknownHostException if the subnet mask cann't be built. |
| 160 | */ |
| 161 | public NetMaskImpl (String a, int prefix) throws UnknownHostException { |
| 162 | super(a); |
| 163 | this.prefix = prefix; |
| 164 | subnet = extractSubNet(getAddress().getAddress()); |
| 165 | } |
| 166 | |
| 167 | /** |
| 168 | * Adds the specified member to the group. |
| 169 | * |
| 170 | * @param p the principal to add to this group. |
| 171 | * @return true if the member was successfully added, false if the |
| 172 | * principal was already a member. |
| 173 | */ |
| 174 | public boolean addMember(Principal p) { |
| 175 | // we don't need to add members because the ip address is a subnet mask |
| 176 | return true; |
| 177 | } |
| 178 | |
| 179 | public int hashCode() { |
| 180 | return super.hashCode(); |
| 181 | } |
| 182 | |
| 183 | /** |
| 184 | * Compares this group to the specified object. Returns true if the object |
| 185 | * passed in matches the group represented. |
| 186 | * |
| 187 | * @param p the object to compare with. |
| 188 | * @return true if the object passed in matches the subnet mask, |
| 189 | * false otherwise. |
| 190 | */ |
| 191 | public boolean equals (Object p) { |
| 192 | if (p instanceof PrincipalImpl || p instanceof NetMaskImpl){ |
| 193 | PrincipalImpl received = (PrincipalImpl) p; |
| 194 | InetAddress addr = received.getAddress(); |
| 195 | if (SNMP_LOGGER.isLoggable(Level.FINEST)) { |
| 196 | SNMP_LOGGER.logp(Level.FINEST, NetMaskImpl.class.getName(), "equals", |
| 197 | "Received Address : " + addr); |
| 198 | } |
| 199 | byte[] recAddr = addr.getAddress(); |
| 200 | for(int i = 0; i < subnet.length; i++) { |
| 201 | if (SNMP_LOGGER.isLoggable(Level.FINEST)) { |
| 202 | SNMP_LOGGER.logp(Level.FINEST, NetMaskImpl.class.getName(), "equals", |
| 203 | "(recAddr[i]) : " + (recAddr[i] & 0xFF)); |
| 204 | SNMP_LOGGER.logp(Level.FINEST, NetMaskImpl.class.getName(), "equals", |
| 205 | "(recAddr[i] & subnet[i]) : " + |
| 206 | ((recAddr[i] & (int)subnet[i]) &0xFF) + |
| 207 | " subnet[i] : " + (subnet[i] &0xFF)); |
| 208 | } |
| 209 | if((recAddr[i] & subnet[i]) != subnet[i]) { |
| 210 | if (SNMP_LOGGER.isLoggable(Level.FINEST)) { |
| 211 | SNMP_LOGGER.logp(Level.FINEST, NetMaskImpl.class.getName(), "equals", |
| 212 | "FALSE"); |
| 213 | } |
| 214 | return false; |
| 215 | } |
| 216 | } |
| 217 | if (SNMP_LOGGER.isLoggable(Level.FINEST)) { |
| 218 | SNMP_LOGGER.logp(Level.FINEST, NetMaskImpl.class.getName(), "equals", |
| 219 | "TRUE"); |
| 220 | } |
| 221 | return true; |
| 222 | } else |
| 223 | return false; |
| 224 | } |
| 225 | /** |
| 226 | * Returns true if the passed principal is a member of the group. |
| 227 | * |
| 228 | * @param p the principal whose membership is to be checked. |
| 229 | * @return true if the principal is a member of this group, false otherwise. |
| 230 | */ |
| 231 | public boolean isMember(Principal p) { |
| 232 | if ((p.hashCode() & super.hashCode()) == p.hashCode()) return true; |
| 233 | else return false; |
| 234 | } |
| 235 | |
| 236 | /** |
| 237 | * Returns an enumeration which contains the subnet mask. |
| 238 | * |
| 239 | * @return an enumeration which contains the subnet mask. |
| 240 | */ |
| 241 | public Enumeration<? extends Principal> members(){ |
| 242 | Vector<Principal> v = new Vector<Principal>(1); |
| 243 | v.addElement(this); |
| 244 | return v.elements(); |
| 245 | } |
| 246 | |
| 247 | /** |
| 248 | * Removes the specified member from the group. (Not implemented) |
| 249 | * |
| 250 | * @param p the principal to remove from this group. |
| 251 | * @return allways return true. |
| 252 | */ |
| 253 | public boolean removeMember(Principal p) { |
| 254 | return true; |
| 255 | } |
| 256 | |
| 257 | /** |
| 258 | * Prints a string representation of this group. |
| 259 | * |
| 260 | * @return a string representation of this group. |
| 261 | */ |
| 262 | public String toString() { |
| 263 | return ("NetMaskImpl :"+ super.getAddress().toString() + "/" + prefix); |
| 264 | } |
| 265 | |
| 266 | } |