author | amenkov |
Mon, 28 Feb 2011 18:36:33 +0300 | |
changeset 8525 | 08f98f5a11df |
parent 5506 | 202f599c92aa |
child 11123 | 399112af8803 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1999, 2009, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package com.sun.media.sound; |
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import java.io.BufferedInputStream; |
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import java.io.InputStream; |
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import java.io.File; |
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import java.io.FileInputStream; |
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import java.util.ArrayList; |
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import java.util.Iterator; |
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import java.util.List; |
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import java.util.Properties; |
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import java.security.AccessController; |
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import java.security.PrivilegedAction; |
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import javax.sound.sampled.AudioPermission; |
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import sun.misc.Service; |
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/** Managing security in the Java Sound implementation. |
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* This class contains all code that uses and is used by |
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* SecurityManager.doPrivileged(). |
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* |
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* @author Matthias Pfisterer |
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*/ |
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class JSSecurityManager { |
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/** Prevent instantiation. |
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*/ |
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private JSSecurityManager() { |
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} |
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/** Checks if the VM currently has a SecurityManager installed. |
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* Note that this may change over time. So the result of this method |
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* should not be cached. |
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* |
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* @return true if a SecurityManger is installed, false otherwise. |
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*/ |
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private static boolean hasSecurityManager() { |
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return (System.getSecurityManager() != null); |
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} |
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static void checkRecordPermission() throws SecurityException { |
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if(Printer.trace) Printer.trace("JSSecurityManager.checkRecordPermission()"); |
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SecurityManager sm = System.getSecurityManager(); |
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if (sm != null) { |
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sm.checkPermission(new AudioPermission("record")); |
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} |
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} |
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static void loadLibrary(final String libName) { |
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try { |
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if (hasSecurityManager()) { |
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if(Printer.debug) Printer.debug("using security manager to load library"); |
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PrivilegedAction action = new PrivilegedAction() { |
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public Object run() { |
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System.loadLibrary(libName); |
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return null; |
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} |
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}; |
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AccessController.doPrivileged(action); |
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} else { |
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if(Printer.debug) Printer.debug("not using security manager to load library"); |
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System.loadLibrary(libName); |
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} |
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if (Printer.debug) Printer.debug("loaded library " + libName); |
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} catch (UnsatisfiedLinkError e2) { |
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if (Printer.err)Printer.err("UnsatisfiedLinkError loading native library " + libName); |
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throw(e2); |
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} |
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} |
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static String getProperty(final String propertyName) { |
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String propertyValue; |
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if (hasSecurityManager()) { |
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if(Printer.debug) Printer.debug("using JDK 1.2 security to get property"); |
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try{ |
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PrivilegedAction action = new PrivilegedAction() { |
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public Object run() { |
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try { |
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return System.getProperty(propertyName); |
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} catch (Throwable t) { |
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return null; |
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} |
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} |
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}; |
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propertyValue = (String) AccessController.doPrivileged(action); |
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} catch( Exception e ) { |
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if(Printer.debug) Printer.debug("not using JDK 1.2 security to get properties"); |
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propertyValue = System.getProperty(propertyName); |
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} |
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} else { |
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if(Printer.debug) Printer.debug("not using JDK 1.2 security to get properties"); |
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propertyValue = System.getProperty(propertyName); |
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} |
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return propertyValue; |
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} |
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/** Load properties from a file. |
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This method tries to load properties from the filename give into |
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the passed properties object. |
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If the file cannot be found or something else goes wrong, |
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the method silently fails. |
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@param properties The properties bundle to store the values of the |
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properties file. |
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@param filename The filename of the properties file to load. This |
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filename is interpreted as relative to the subdirectory "lib" in |
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the JRE directory. |
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*/ |
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static void loadProperties(final Properties properties, |
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final String filename) { |
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if(hasSecurityManager()) { |
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try { |
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// invoke the privileged action using 1.2 security |
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PrivilegedAction action = new PrivilegedAction() { |
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public Object run() { |
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loadPropertiesImpl(properties, filename); |
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return null; |
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} |
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}; |
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AccessController.doPrivileged(action); |
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if(Printer.debug)Printer.debug("Loaded properties with JDK 1.2 security"); |
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} catch (Exception e) { |
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if(Printer.debug)Printer.debug("Exception loading properties with JDK 1.2 security"); |
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// try without using JDK 1.2 security |
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loadPropertiesImpl(properties, filename); |
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} |
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} else { |
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// not JDK 1.2 security, assume we already have permission |
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loadPropertiesImpl(properties, filename); |
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} |
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} |
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private static void loadPropertiesImpl(Properties properties, |
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String filename) { |
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if(Printer.trace)Printer.trace(">> JSSecurityManager: loadPropertiesImpl()"); |
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String fname = System.getProperty("java.home"); |
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try { |
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if (fname == null) { |
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throw new Error("Can't find java.home ??"); |
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} |
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File f = new File(fname, "lib"); |
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f = new File(f, filename); |
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fname = f.getCanonicalPath(); |
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InputStream in = new FileInputStream(fname); |
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BufferedInputStream bin = new BufferedInputStream(in); |
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try { |
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properties.load(bin); |
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} finally { |
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if (in != null) { |
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in.close(); |
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} |
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} |
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} catch (Throwable t) { |
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if (Printer.trace) { |
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System.err.println("Could not load properties file \"" + fname + "\""); |
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t.printStackTrace(); |
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} |
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} |
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if(Printer.trace)Printer.trace("<< JSSecurityManager: loadPropertiesImpl() completed"); |
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} |
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private static ThreadGroup getTopmostThreadGroup() { |
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ThreadGroup topmostThreadGroup; |
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if(hasSecurityManager()) { |
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try { |
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// invoke the privileged action using 1.2 security |
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PrivilegedAction action = new PrivilegedAction() { |
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public Object run() { |
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try { |
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return getTopmostThreadGroupImpl(); |
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} catch (Throwable t) { |
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return null; |
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} |
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} |
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}; |
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topmostThreadGroup = (ThreadGroup) AccessController.doPrivileged(action); |
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if(Printer.debug)Printer.debug("Got topmost thread group with JDK 1.2 security"); |
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} catch (Exception e) { |
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if(Printer.debug)Printer.debug("Exception getting topmost thread group with JDK 1.2 security"); |
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// try without using JDK 1.2 security |
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topmostThreadGroup = getTopmostThreadGroupImpl(); |
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} |
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} else { |
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// not JDK 1.2 security, assume we already have permission |
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topmostThreadGroup = getTopmostThreadGroupImpl(); |
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} |
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return topmostThreadGroup; |
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} |
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private static ThreadGroup getTopmostThreadGroupImpl() { |
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if(Printer.trace)Printer.trace(">> JSSecurityManager: getTopmostThreadGroupImpl()"); |
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ThreadGroup g = Thread.currentThread().getThreadGroup(); |
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while ((g.getParent() != null) && (g.getParent().getParent() != null)) { |
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g = g.getParent(); |
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} |
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if(Printer.trace)Printer.trace("<< JSSecurityManager: getTopmostThreadGroupImpl() completed"); |
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return g; |
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} |
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/** Create a Thread in the topmost ThreadGroup. |
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*/ |
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static Thread createThread(final Runnable runnable, |
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final String threadName, |
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final boolean isDaemon, final int priority, |
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final boolean doStart) { |
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Thread thread = null; |
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if(hasSecurityManager()) { |
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PrivilegedAction action = new PrivilegedAction() { |
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public Object run() { |
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try { |
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return createThreadImpl(runnable, threadName, |
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isDaemon, priority, |
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doStart); |
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} catch (Throwable t) { |
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return null; |
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} |
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} |
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}; |
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thread = (Thread) AccessController.doPrivileged(action); |
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if(Printer.debug) Printer.debug("created thread with JDK 1.2 security"); |
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} else { |
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if(Printer.debug)Printer.debug("not using JDK 1.2 security"); |
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thread = createThreadImpl(runnable, threadName, isDaemon, priority, |
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doStart); |
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} |
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return thread; |
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} |
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private static Thread createThreadImpl(Runnable runnable, |
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String threadName, |
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boolean isDaemon, int priority, |
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boolean doStart) { |
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ThreadGroup threadGroup = getTopmostThreadGroupImpl(); |
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Thread thread = new Thread(threadGroup, runnable); |
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if (threadName != null) { |
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thread.setName(threadName); |
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} |
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thread.setDaemon(isDaemon); |
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if (priority >= 0) { |
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thread.setPriority(priority); |
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} |
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if (doStart) { |
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thread.start(); |
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} |
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return thread; |
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} |
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static List getProviders(final Class providerClass) { |
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List p = new ArrayList(); |
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// Service.providers(Class) just creates "lazy" iterator instance, |
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// so it doesn't require do be called from privileged section |
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final Iterator ps = Service.providers(providerClass); |
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// the iterator's hasNext() method looks through classpath for |
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// the provider class names, so it requires read permissions |
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PrivilegedAction<Boolean> hasNextAction = new PrivilegedAction<Boolean>() { |
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public Boolean run() { |
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return ps.hasNext(); |
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} |
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}; |
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while (AccessController.doPrivileged(hasNextAction)) { |
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try { |
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// the iterator's next() method creates instances of the |
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// providers and it should be called in the current security |
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// context |
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Object provider = ps.next(); |
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if (providerClass.isInstance(provider)) { |
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// $$mp 2003-08-22 |
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// Always adding at the beginning reverses the |
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// order of the providers. So we no longer have |
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// to do this in AudioSystem and MidiSystem. |
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p.add(0, provider); |
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} |
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} catch (Throwable t) { |
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//$$fb 2002-11-07: do not fail on SPI not found |
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if (Printer.err) t.printStackTrace(); |
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} |
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} |
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317 |
return p; |
2 | 318 |
} |
319 |
} |