/*
* Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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*/
package com.sun.media.sound;
import java.io.BufferedInputStream;
import java.io.InputStream;
import java.io.File;
import java.io.FileInputStream;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Properties;
import java.security.AccessController;
import java.security.PrivilegedAction;
import javax.sound.sampled.AudioPermission;
import sun.misc.Service;
/** Managing security in the Java Sound implementation.
* This class contains all code that uses and is used by
* SecurityManager.doPrivileged().
*
* @author Matthias Pfisterer
*/
final class JSSecurityManager {
/** Prevent instantiation.
*/
private JSSecurityManager() {
}
/** Checks if the VM currently has a SecurityManager installed.
* Note that this may change over time. So the result of this method
* should not be cached.
*
* @return true if a SecurityManger is installed, false otherwise.
*/
private static boolean hasSecurityManager() {
return (System.getSecurityManager() != null);
}
static void checkRecordPermission() throws SecurityException {
if(Printer.trace) Printer.trace("JSSecurityManager.checkRecordPermission()");
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkPermission(new AudioPermission("record"));
}
}
static String getProperty(final String propertyName) {
String propertyValue;
if (hasSecurityManager()) {
if(Printer.debug) Printer.debug("using JDK 1.2 security to get property");
try{
PrivilegedAction action = new PrivilegedAction() {
public Object run() {
try {
return System.getProperty(propertyName);
} catch (Throwable t) {
return null;
}
}
};
propertyValue = (String) AccessController.doPrivileged(action);
} catch( Exception e ) {
if(Printer.debug) Printer.debug("not using JDK 1.2 security to get properties");
propertyValue = System.getProperty(propertyName);
}
} else {
if(Printer.debug) Printer.debug("not using JDK 1.2 security to get properties");
propertyValue = System.getProperty(propertyName);
}
return propertyValue;
}
/** Load properties from a file.
This method tries to load properties from the filename give into
the passed properties object.
If the file cannot be found or something else goes wrong,
the method silently fails.
@param properties The properties bundle to store the values of the
properties file.
@param filename The filename of the properties file to load. This
filename is interpreted as relative to the subdirectory "lib" in
the JRE directory.
*/
static void loadProperties(final Properties properties,
final String filename) {
if(hasSecurityManager()) {
try {
// invoke the privileged action using 1.2 security
PrivilegedAction action = new PrivilegedAction() {
public Object run() {
loadPropertiesImpl(properties, filename);
return null;
}
};
AccessController.doPrivileged(action);
if(Printer.debug)Printer.debug("Loaded properties with JDK 1.2 security");
} catch (Exception e) {
if(Printer.debug)Printer.debug("Exception loading properties with JDK 1.2 security");
// try without using JDK 1.2 security
loadPropertiesImpl(properties, filename);
}
} else {
// not JDK 1.2 security, assume we already have permission
loadPropertiesImpl(properties, filename);
}
}
private static void loadPropertiesImpl(Properties properties,
String filename) {
if(Printer.trace)Printer.trace(">> JSSecurityManager: loadPropertiesImpl()");
String fname = System.getProperty("java.home");
try {
if (fname == null) {
throw new Error("Can't find java.home ??");
}
File f = new File(fname, "lib");
f = new File(f, filename);
fname = f.getCanonicalPath();
InputStream in = new FileInputStream(fname);
BufferedInputStream bin = new BufferedInputStream(in);
try {
properties.load(bin);
} finally {
if (in != null) {
in.close();
}
}
} catch (Throwable t) {
if (Printer.trace) {
System.err.println("Could not load properties file \"" + fname + "\"");
t.printStackTrace();
}
}
if(Printer.trace)Printer.trace("<< JSSecurityManager: loadPropertiesImpl() completed");
}
/** Create a Thread in the current ThreadGroup.
*/
static Thread createThread(final Runnable runnable,
final String threadName,
final boolean isDaemon, final int priority,
final boolean doStart) {
Thread thread = new Thread(runnable);
if (threadName != null) {
thread.setName(threadName);
}
thread.setDaemon(isDaemon);
if (priority >= 0) {
thread.setPriority(priority);
}
if (doStart) {
thread.start();
}
return thread;
}
static List getProviders(final Class providerClass) {
List p = new ArrayList();
// Service.providers(Class) just creates "lazy" iterator instance,
// so it doesn't require do be called from privileged section
final Iterator ps = Service.providers(providerClass);
// the iterator's hasNext() method looks through classpath for
// the provider class names, so it requires read permissions
PrivilegedAction<Boolean> hasNextAction = new PrivilegedAction<Boolean>() {
public Boolean run() {
return ps.hasNext();
}
};
while (AccessController.doPrivileged(hasNextAction)) {
try {
// the iterator's next() method creates instances of the
// providers and it should be called in the current security
// context
Object provider = ps.next();
if (providerClass.isInstance(provider)) {
// $$mp 2003-08-22
// Always adding at the beginning reverses the
// order of the providers. So we no longer have
// to do this in AudioSystem and MidiSystem.
p.add(0, provider);
}
} catch (Throwable t) {
//$$fb 2002-11-07: do not fail on SPI not found
if (Printer.err) t.printStackTrace();
}
}
return p;
}
}