Showing the changes to java/pkg/sun/net/InetAddressCachePolicy.java (1 of 18352 files). Show all
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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 | } | ||