J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1999-2007 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.media.sound; |
| 27 | |
| 28 | import java.io.BufferedInputStream; |
| 29 | import java.io.InputStream; |
| 30 | import java.io.File; |
| 31 | import java.io.FileInputStream; |
| 32 | |
| 33 | import java.util.ArrayList; |
| 34 | import java.util.Iterator; |
| 35 | import java.util.List; |
| 36 | import java.util.Properties; |
| 37 | |
| 38 | import java.security.AccessController; |
| 39 | import java.security.PrivilegedAction; |
| 40 | |
| 41 | import javax.sound.sampled.AudioPermission; |
| 42 | |
| 43 | import sun.misc.Service; |
| 44 | |
| 45 | |
| 46 | /** Managing security in the Java Sound implementation. |
| 47 | * This class contains all code that uses and is used by |
| 48 | * SecurityManager.doPrivileged(). |
| 49 | * |
| 50 | * @author Matthias Pfisterer |
| 51 | */ |
| 52 | class JSSecurityManager { |
| 53 | |
| 54 | /** Prevent instantiation. |
| 55 | */ |
| 56 | private JSSecurityManager() { |
| 57 | } |
| 58 | |
| 59 | /** Checks if the VM currently has a SecurityManager installed. |
| 60 | * Note that this may change over time. So the result of this method |
| 61 | * should not be cached. |
| 62 | * |
| 63 | * @return true if a SecurityManger is installed, false otherwise. |
| 64 | */ |
| 65 | private static boolean hasSecurityManager() { |
| 66 | return (System.getSecurityManager() != null); |
| 67 | } |
| 68 | |
| 69 | |
| 70 | static void checkRecordPermission() throws SecurityException { |
| 71 | if(Printer.trace) Printer.trace("JSSecurityManager.checkRecordPermission()"); |
| 72 | SecurityManager sm = System.getSecurityManager(); |
| 73 | if (sm != null) { |
| 74 | sm.checkPermission(new AudioPermission("record")); |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | |
| 79 | static void loadLibrary(final String libName) { |
| 80 | try { |
| 81 | if (hasSecurityManager()) { |
| 82 | if(Printer.debug) Printer.debug("using security manager to load library"); |
| 83 | PrivilegedAction action = new PrivilegedAction() { |
| 84 | public Object run() { |
| 85 | System.loadLibrary(libName); |
| 86 | return null; |
| 87 | } |
| 88 | }; |
| 89 | AccessController.doPrivileged(action); |
| 90 | } else { |
| 91 | if(Printer.debug) Printer.debug("not using security manager to load library"); |
| 92 | System.loadLibrary(libName); |
| 93 | } |
| 94 | if (Printer.debug) Printer.debug("loaded library " + libName); |
| 95 | } catch (UnsatisfiedLinkError e2) { |
| 96 | if (Printer.err)Printer.err("UnsatisfiedLinkError loading native library " + libName); |
| 97 | throw(e2); |
| 98 | } |
| 99 | } |
| 100 | |
| 101 | |
| 102 | static String getProperty(final String propertyName) { |
| 103 | String propertyValue; |
| 104 | if (hasSecurityManager()) { |
| 105 | if(Printer.debug) Printer.debug("using JDK 1.2 security to get property"); |
| 106 | try{ |
| 107 | PrivilegedAction action = new PrivilegedAction() { |
| 108 | public Object run() { |
| 109 | try { |
| 110 | return System.getProperty(propertyName); |
| 111 | } catch (Throwable t) { |
| 112 | return null; |
| 113 | } |
| 114 | } |
| 115 | }; |
| 116 | propertyValue = (String) AccessController.doPrivileged(action); |
| 117 | } catch( Exception e ) { |
| 118 | if(Printer.debug) Printer.debug("not using JDK 1.2 security to get properties"); |
| 119 | propertyValue = System.getProperty(propertyName); |
| 120 | } |
| 121 | } else { |
| 122 | if(Printer.debug) Printer.debug("not using JDK 1.2 security to get properties"); |
| 123 | propertyValue = System.getProperty(propertyName); |
| 124 | } |
| 125 | return propertyValue; |
| 126 | } |
| 127 | |
| 128 | |
| 129 | /** Load properties from a file. |
| 130 | This method tries to load properties from the filename give into |
| 131 | the passed properties object. |
| 132 | If the file cannot be found or something else goes wrong, |
| 133 | the method silently fails. |
| 134 | @param properties The properties bundle to store the values of the |
| 135 | properties file. |
| 136 | @param filename The filename of the properties file to load. This |
| 137 | filename is interpreted as relative to the subdirectory "lib" in |
| 138 | the JRE directory. |
| 139 | */ |
| 140 | static void loadProperties(final Properties properties, |
| 141 | final String filename) { |
| 142 | if(hasSecurityManager()) { |
| 143 | try { |
| 144 | // invoke the privileged action using 1.2 security |
| 145 | PrivilegedAction action = new PrivilegedAction() { |
| 146 | public Object run() { |
| 147 | loadPropertiesImpl(properties, filename); |
| 148 | return null; |
| 149 | } |
| 150 | }; |
| 151 | AccessController.doPrivileged(action); |
| 152 | if(Printer.debug)Printer.debug("Loaded properties with JDK 1.2 security"); |
| 153 | } catch (Exception e) { |
| 154 | if(Printer.debug)Printer.debug("Exception loading properties with JDK 1.2 security"); |
| 155 | // try without using JDK 1.2 security |
| 156 | loadPropertiesImpl(properties, filename); |
| 157 | } |
| 158 | } else { |
| 159 | // not JDK 1.2 security, assume we already have permission |
| 160 | loadPropertiesImpl(properties, filename); |
| 161 | } |
| 162 | } |
| 163 | |
| 164 | |
| 165 | private static void loadPropertiesImpl(Properties properties, |
| 166 | String filename) { |
| 167 | if(Printer.trace)Printer.trace(">> JSSecurityManager: loadPropertiesImpl()"); |
| 168 | String fname = System.getProperty("java.home"); |
| 169 | try { |
| 170 | if (fname == null) { |
| 171 | throw new Error("Can't find java.home ??"); |
| 172 | } |
| 173 | File f = new File(fname, "lib"); |
| 174 | f = new File(f, filename); |
| 175 | fname = f.getCanonicalPath(); |
| 176 | InputStream in = new FileInputStream(fname); |
| 177 | BufferedInputStream bin = new BufferedInputStream(in); |
| 178 | try { |
| 179 | properties.load(bin); |
| 180 | } finally { |
| 181 | if (in != null) { |
| 182 | in.close(); |
| 183 | } |
| 184 | } |
| 185 | } catch (Throwable t) { |
| 186 | if (Printer.trace) { |
| 187 | System.err.println("Could not load properties file \"" + fname + "\""); |
| 188 | t.printStackTrace(); |
| 189 | } |
| 190 | } |
| 191 | if(Printer.trace)Printer.trace("<< JSSecurityManager: loadPropertiesImpl() completed"); |
| 192 | } |
| 193 | |
| 194 | |
| 195 | private static ThreadGroup getTopmostThreadGroup() { |
| 196 | ThreadGroup topmostThreadGroup; |
| 197 | if(hasSecurityManager()) { |
| 198 | try { |
| 199 | // invoke the privileged action using 1.2 security |
| 200 | PrivilegedAction action = new PrivilegedAction() { |
| 201 | public Object run() { |
| 202 | try { |
| 203 | return getTopmostThreadGroupImpl(); |
| 204 | } catch (Throwable t) { |
| 205 | return null; |
| 206 | } |
| 207 | } |
| 208 | }; |
| 209 | topmostThreadGroup = (ThreadGroup) AccessController.doPrivileged(action); |
| 210 | if(Printer.debug)Printer.debug("Got topmost thread group with JDK 1.2 security"); |
| 211 | } catch (Exception e) { |
| 212 | if(Printer.debug)Printer.debug("Exception getting topmost thread group with JDK 1.2 security"); |
| 213 | // try without using JDK 1.2 security |
| 214 | topmostThreadGroup = getTopmostThreadGroupImpl(); |
| 215 | } |
| 216 | } else { |
| 217 | // not JDK 1.2 security, assume we already have permission |
| 218 | topmostThreadGroup = getTopmostThreadGroupImpl(); |
| 219 | } |
| 220 | return topmostThreadGroup; |
| 221 | } |
| 222 | |
| 223 | |
| 224 | private static ThreadGroup getTopmostThreadGroupImpl() { |
| 225 | if(Printer.trace)Printer.trace(">> JSSecurityManager: getTopmostThreadGroupImpl()"); |
| 226 | ThreadGroup g = Thread.currentThread().getThreadGroup(); |
| 227 | while ((g.getParent() != null) && (g.getParent().getParent() != null)) { |
| 228 | g = g.getParent(); |
| 229 | } |
| 230 | if(Printer.trace)Printer.trace("<< JSSecurityManager: getTopmostThreadGroupImpl() completed"); |
| 231 | return g; |
| 232 | } |
| 233 | |
| 234 | |
| 235 | /** Create a Thread in the topmost ThreadGroup. |
| 236 | */ |
| 237 | static Thread createThread(final Runnable runnable, |
| 238 | final String threadName, |
| 239 | final boolean isDaemon, final int priority, |
| 240 | final boolean doStart) { |
| 241 | Thread thread = null; |
| 242 | if(hasSecurityManager()) { |
| 243 | PrivilegedAction action = new PrivilegedAction() { |
| 244 | public Object run() { |
| 245 | try { |
| 246 | return createThreadImpl(runnable, threadName, |
| 247 | isDaemon, priority, |
| 248 | doStart); |
| 249 | } catch (Throwable t) { |
| 250 | return null; |
| 251 | } |
| 252 | } |
| 253 | }; |
| 254 | thread = (Thread) AccessController.doPrivileged(action); |
| 255 | if(Printer.debug) Printer.debug("created thread with JDK 1.2 security"); |
| 256 | } else { |
| 257 | if(Printer.debug)Printer.debug("not using JDK 1.2 security"); |
| 258 | thread = createThreadImpl(runnable, threadName, isDaemon, priority, |
| 259 | doStart); |
| 260 | } |
| 261 | return thread; |
| 262 | } |
| 263 | |
| 264 | |
| 265 | private static Thread createThreadImpl(Runnable runnable, |
| 266 | String threadName, |
| 267 | boolean isDaemon, int priority, |
| 268 | boolean doStart) { |
| 269 | ThreadGroup threadGroup = getTopmostThreadGroupImpl(); |
| 270 | Thread thread = new Thread(threadGroup, runnable); |
| 271 | if (threadName != null) { |
| 272 | thread.setName(threadName); |
| 273 | } |
| 274 | thread.setDaemon(isDaemon); |
| 275 | if (priority >= 0) { |
| 276 | thread.setPriority(priority); |
| 277 | } |
| 278 | if (doStart) { |
| 279 | thread.start(); |
| 280 | } |
| 281 | return thread; |
| 282 | } |
| 283 | |
| 284 | |
| 285 | static List getProviders(final Class providerClass) { |
| 286 | PrivilegedAction action = new PrivilegedAction() { |
| 287 | public Object run() { |
| 288 | List p = new ArrayList(); |
| 289 | Iterator ps = Service.providers(providerClass); |
| 290 | while (ps.hasNext()) { |
| 291 | try { |
| 292 | Object provider = ps.next(); |
| 293 | if (providerClass.isInstance(provider)) { |
| 294 | // $$mp 2003-08-22 |
| 295 | // Always adding at the beginning reverses the |
| 296 | // order of the providers. So we no longer have |
| 297 | // to do this in AudioSystem and MidiSystem. |
| 298 | p.add(0, provider); |
| 299 | } |
| 300 | } catch (Throwable t) { |
| 301 | //$$fb 2002-11-07: do not fail on SPI not found |
| 302 | if (Printer.err) t.printStackTrace(); |
| 303 | } } |
| 304 | return p; |
| 305 | } |
| 306 | }; |
| 307 | List providers = (List) AccessController.doPrivileged(action); |
| 308 | return providers; |
| 309 | } |
| 310 | } |