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| 1 | +/* | |
| 2 | + * Copyright (c) 1998, 2010, Oracle and/or its affiliates. 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. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +package sun.net; | |
| 27 | + | |
| 28 | +import java.security.PrivilegedAction; | |
| 29 | +import java.security.Security; | |
| 30 | + | |
| 31 | +public final class InetAddressCachePolicy { | |
| 32 | + | |
| 33 | + // Controls the cache policy for successful lookups only | |
| 34 | + private static final String cachePolicyProp = "networkaddress.cache.ttl"; | |
| 35 | + private static final String cachePolicyPropFallback = | |
| 36 | + "sun.net.inetaddr.ttl"; | |
| 37 | + | |
| 38 | + // Controls the cache policy for negative lookups only | |
| 39 | + private static final String negativeCachePolicyProp = | |
| 40 | + "networkaddress.cache.negative.ttl"; | |
| 41 | + private static final String negativeCachePolicyPropFallback = | |
| 42 | + "sun.net.inetaddr.negative.ttl"; | |
| 43 | + | |
| 44 | + public static final int FOREVER = -1; | |
| 45 | + public static final int NEVER = 0; | |
| 46 | + | |
| 47 | + /* default value for positive lookups */ | |
| 48 | + public static final int DEFAULT_POSITIVE = 30; | |
| 49 | + | |
| 50 | + /* The Java-level namelookup cache policy for successful lookups: | |
| 51 | + * | |
| 52 | + * -1: caching forever | |
| 53 | + * any positive value: the number of seconds to cache an address for | |
| 54 | + * | |
| 55 | + * default value is forever (FOREVER), as we let the platform do the | |
| 56 | + * caching. For security reasons, this caching is made forever when | |
| 57 | + * a security manager is set. | |
| 58 | + */ | |
| 59 | + private static int cachePolicy = FOREVER; | |
| 60 | + | |
| 61 | + /* The Java-level namelookup cache policy for negative lookups: | |
| 62 | + * | |
| 63 | + * -1: caching forever | |
| 64 | + * any positive value: the number of seconds to cache an address for | |
| 65 | + * | |
| 66 | + * default value is 0. It can be set to some other value for | |
| 67 | + * performance reasons. | |
| 68 | + */ | |
| 69 | + private static int negativeCachePolicy = NEVER; | |
| 70 | + | |
| 71 | + /* | |
| 72 | + * Whether or not the cache policy for successful lookups was set | |
| 73 | + * using a property (cmd line). | |
| 74 | + */ | |
| 75 | + private static boolean propertySet; | |
| 76 | + | |
| 77 | + /* | |
| 78 | + * Whether or not the cache policy for negative lookups was set | |
| 79 | + * using a property (cmd line). | |
| 80 | + */ | |
| 81 | + private static boolean propertyNegativeSet; | |
| 82 | + | |
| 83 | + /* | |
| 84 | + * Initialize | |
| 85 | + */ | |
| 86 | + static { | |
| 87 | + Integer tmp = null; | |
| 88 | + | |
| 89 | + try { | |
| 90 | + tmp = new Integer( | |
| 91 | + java.security.AccessController.doPrivileged ( | |
| 92 | + new PrivilegedAction<String>() { | |
| 93 | + public String run() { | |
| 94 | + return Security.getProperty(cachePolicyProp); | |
| 95 | + } | |
| 96 | + })); | |
| 97 | + } catch (NumberFormatException e) { | |
| 98 | + // ignore | |
| 99 | + } | |
| 100 | + if (tmp != null) { | |
| 101 | + cachePolicy = tmp.intValue(); | |
| 102 | + if (cachePolicy < 0) { | |
| 103 | + cachePolicy = FOREVER; | |
| 104 | + } | |
| 105 | + propertySet = true; | |
| 106 | + } else { | |
| 107 | + tmp = java.security.AccessController.doPrivileged | |
| 108 | + (new sun.security.action.GetIntegerAction(cachePolicyPropFallback)); | |
| 109 | + if (tmp != null) { | |
| 110 | + cachePolicy = tmp.intValue(); | |
| 111 | + if (cachePolicy < 0) { | |
| 112 | + cachePolicy = FOREVER; | |
| 113 | + } | |
| 114 | + propertySet = true; | |
| 115 | + } else { | |
| 116 | + /* No properties defined for positive caching. If there is no | |
| 117 | + * security manager then use the default positive cache value. | |
| 118 | + */ | |
| 119 | + if (System.getSecurityManager() == null) { | |
| 120 | + cachePolicy = DEFAULT_POSITIVE; | |
| 121 | + } | |
| 122 | + } | |
| 123 | + } | |
| 124 | + | |
| 125 | + try { | |
| 126 | + tmp = new Integer( | |
| 127 | + java.security.AccessController.doPrivileged ( | |
| 128 | + new PrivilegedAction<String>() { | |
| 129 | + public String run() { | |
| 130 | + return Security.getProperty(negativeCachePolicyProp); | |
| 131 | + } | |
| 132 | + })); | |
| 133 | + } catch (NumberFormatException e) { | |
| 134 | + // ignore | |
| 135 | + } | |
| 136 | + | |
| 137 | + if (tmp != null) { | |
| 138 | + negativeCachePolicy = tmp.intValue(); | |
| 139 | + if (negativeCachePolicy < 0) { | |
| 140 | + negativeCachePolicy = FOREVER; | |
| 141 | + } | |
| 142 | + propertyNegativeSet = true; | |
| 143 | + } else { | |
| 144 | + tmp = java.security.AccessController.doPrivileged | |
| 145 | + (new sun.security.action.GetIntegerAction(negativeCachePolicyPropFallback)); | |
| 146 | + if (tmp != null) { | |
| 147 | + negativeCachePolicy = tmp.intValue(); | |
| 148 | + if (negativeCachePolicy < 0) { | |
| 149 | + negativeCachePolicy = FOREVER; | |
| 150 | + } | |
| 151 | + propertyNegativeSet = true; | |
| 152 | + } | |
| 153 | + } | |
| 154 | + } | |
| 155 | + | |
| 156 | + public static synchronized int get() { | |
| 157 | + return cachePolicy; | |
| 158 | + } | |
| 159 | + | |
| 160 | + public static synchronized int getNegative() { | |
| 161 | + return negativeCachePolicy; | |
| 162 | + } | |
| 163 | + | |
| 164 | + /** | |
| 165 | + * Sets the cache policy for successful lookups if the user has not | |
| 166 | + * already specified a cache policy for it using a | |
| 167 | + * command-property. | |
| 168 | + * @param newPolicy the value in seconds for how long the lookup | |
| 169 | + * should be cached | |
| 170 | + */ | |
| 171 | + public static synchronized void setIfNotSet(int newPolicy) { | |
| 172 | + /* | |
| 173 | + * When setting the new value we may want to signal that the | |
| 174 | + * cache should be flushed, though this doesn't seem strictly | |
| 175 | + * necessary. | |
| 176 | + */ | |
| 177 | + if (!propertySet) { | |
| 178 | + checkValue(newPolicy, cachePolicy); | |
| 179 | + cachePolicy = newPolicy; | |
| 180 | + } | |
| 181 | + } | |
| 182 | + | |
| 183 | + /** | |
| 184 | + * Sets the cache policy for negative lookups if the user has not | |
| 185 | + * already specified a cache policy for it using a | |
| 186 | + * command-property. | |
| 187 | + * @param newPolicy the value in seconds for how long the lookup | |
| 188 | + * should be cached | |
| 189 | + */ | |
| 190 | + public static synchronized void setNegativeIfNotSet(int newPolicy) { | |
| 191 | + /* | |
| 192 | + * When setting the new value we may want to signal that the | |
| 193 | + * cache should be flushed, though this doesn't seem strictly | |
| 194 | + * necessary. | |
| 195 | + */ | |
| 196 | + if (!propertyNegativeSet) { | |
| 197 | + // Negative caching does not seem to have any security | |
| 198 | + // implications. | |
| 199 | + // checkValue(newPolicy, negativeCachePolicy); | |
| 200 | + negativeCachePolicy = newPolicy; | |
| 201 | + } | |
| 202 | + } | |
| 203 | + | |
| 204 | + private static void checkValue(int newPolicy, int oldPolicy) { | |
| 205 | + /* | |
| 206 | + * If malicious code gets a hold of this method, prevent | |
| 207 | + * setting the cache policy to something laxer or some | |
| 208 | + * invalid negative value. | |
| 209 | + */ | |
| 210 | + if (newPolicy == FOREVER) | |
| 211 | + return; | |
| 212 | + | |
| 213 | + if ((oldPolicy == FOREVER) || | |
| 214 | + (newPolicy < oldPolicy) || | |
| 215 | + (newPolicy < FOREVER)) { | |
| 216 | + | |
| 217 | + throw new | |
| 218 | + SecurityException("can't make InetAddress cache more lax"); | |
| 219 | + } | |
| 220 | + } | |
| 221 | +} | |