author | rriggs |
Wed, 12 Oct 2016 12:56:35 -0400 | |
changeset 43211 | f264afd5082c |
parent 33288 | ef7d99d1e531 |
permissions | -rw-r--r-- |
2 | 1 |
/* |
43211 | 2 |
* Copyright (c) 1996, 2016, Oracle and/or its affiliates. All rights reserved. |
2 | 3 |
* 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 |
2 | 8 |
* 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 sun.rmi.transport; |
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||
43211 | 27 |
import java.io.ObjectInputFilter; |
33288 | 28 |
import java.net.SocketPermission; |
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import java.rmi.Remote; |
30 |
import java.rmi.RemoteException; |
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import java.rmi.dgc.DGC; |
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import java.rmi.dgc.Lease; |
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import java.rmi.dgc.VMID; |
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import java.rmi.server.LogStream; |
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import java.rmi.server.ObjID; |
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import java.rmi.server.RemoteServer; |
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import java.rmi.server.ServerNotActiveException; |
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43211 | 38 |
import java.rmi.server.UID; |
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import java.security.AccessControlContext; |
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import java.security.AccessController; |
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import java.security.Permissions; |
2 | 42 |
import java.security.PrivilegedAction; |
33288 | 43 |
import java.security.ProtectionDomain; |
43211 | 44 |
import java.security.Security; |
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import java.util.ArrayList; |
46 |
import java.util.HashSet; |
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import java.util.HashMap; |
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import java.util.Iterator; |
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import java.util.List; |
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import java.util.Map; |
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import java.util.Set; |
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import java.util.concurrent.Future; |
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import java.util.concurrent.ScheduledExecutorService; |
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import java.util.concurrent.TimeUnit; |
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import sun.rmi.runtime.Log; |
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import sun.rmi.runtime.RuntimeUtil; |
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import sun.rmi.server.UnicastRef; |
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import sun.rmi.server.UnicastServerRef; |
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import sun.rmi.server.Util; |
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||
61 |
/** |
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* This class implements the guts of the server-side distributed GC |
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* algorithm |
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* |
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* @author Ann Wollrath |
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*/ |
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@SuppressWarnings("deprecation") |
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final class DGCImpl implements DGC { |
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/* dgc system log */ |
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static final Log dgcLog = Log.getLog("sun.rmi.dgc", "dgc", |
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LogStream.parseLevel(AccessController.doPrivileged( |
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(PrivilegedAction<String>) () -> System.getProperty("sun.rmi.dgc.logLevel")))); |
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/** lease duration to grant to clients */ |
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private static final long leaseValue = // default 10 minutes |
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AccessController.doPrivileged( |
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(PrivilegedAction<Long>) () -> Long.getLong("java.rmi.dgc.leaseValue", 600000)); |
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/** lease check interval; default is half of lease grant duration */ |
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private static final long leaseCheckInterval = |
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AccessController.doPrivileged( |
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diff
changeset
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(PrivilegedAction<Long>) () -> Long.getLong("sun.rmi.dgc.checkInterval", leaseValue / 2)); |
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/** thread pool for scheduling delayed tasks */ |
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private static final ScheduledExecutorService scheduler = |
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AccessController.doPrivileged( |
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new RuntimeUtil.GetInstanceAction()).getScheduler(); |
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/** remote implementation of DGC interface for this VM */ |
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private static DGCImpl dgc; |
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/** table that maps VMID to LeaseInfo */ |
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private Map<VMID,LeaseInfo> leaseTable = new HashMap<>(); |
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/** checks for lease expiration */ |
95 |
private Future<?> checker = null; |
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/** |
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* Return the remote implementation of the DGC interface for |
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* this VM. |
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*/ |
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static DGCImpl getDGCImpl() { |
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return dgc; |
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} |
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/** |
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43211 | 106 |
* Property name of the DGC serial filter to augment |
107 |
* the built-in list of allowed types. |
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* Setting the property in the {@code conf/security/java.security} file |
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* or system property will enable the augmented filter. |
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*/ |
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private static final String DGC_FILTER_PROPNAME = "sun.rmi.transport.dgcFilter"; |
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113 |
/** Registry max depth of remote invocations. **/ |
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private static int DGC_MAX_DEPTH = 5; |
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/** Registry maximum array size in remote invocations. **/ |
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private static int DGC_MAX_ARRAY_SIZE = 10000; |
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119 |
/** |
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120 |
* The dgcFilter created from the value of the {@code "sun.rmi.transport.dgcFilter"} |
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121 |
* property. |
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122 |
*/ |
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123 |
private static final ObjectInputFilter dgcFilter = |
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AccessController.doPrivileged((PrivilegedAction<ObjectInputFilter>)DGCImpl::initDgcFilter); |
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126 |
/** |
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127 |
* Initialize the dgcFilter from the security properties or system property; if any |
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* @return an ObjectInputFilter, or null |
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129 |
*/ |
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private static ObjectInputFilter initDgcFilter() { |
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ObjectInputFilter filter = null; |
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String props = System.getProperty(DGC_FILTER_PROPNAME); |
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133 |
if (props == null) { |
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props = Security.getProperty(DGC_FILTER_PROPNAME); |
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} |
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if (props != null) { |
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filter = ObjectInputFilter.Config.createFilter(props); |
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if (dgcLog.isLoggable(Log.BRIEF)) { |
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dgcLog.log(Log.BRIEF, "dgcFilter = " + filter); |
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140 |
} |
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141 |
} |
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return filter; |
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} |
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145 |
/** |
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* Construct a new server-side remote object collector at |
147 |
* a particular port. Disallow construction from outside. |
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148 |
*/ |
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149 |
private DGCImpl() {} |
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150 |
||
151 |
/** |
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* The dirty call adds the VMID "vmid" to the set of clients |
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* that hold references to the object associated with the ObjID |
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* id. The long "sequenceNum" is used to detect late dirty calls. If |
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* the VMID "vmid" is null, a VMID will be generated on the |
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* server (for use by the client in subsequent calls) and |
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* returned. |
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* |
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* The client must call the "dirty" method to renew the lease |
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* before the "lease" time expires or all references to remote |
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* objects in this VM that the client holds are considered |
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* "unreferenced". |
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*/ |
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public Lease dirty(ObjID[] ids, long sequenceNum, Lease lease) { |
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165 |
VMID vmid = lease.getVMID(); |
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166 |
/* |
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167 |
* The server specifies the lease value; the client has |
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168 |
* no say in the matter. |
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*/ |
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170 |
long duration = leaseValue; |
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172 |
if (dgcLog.isLoggable(Log.VERBOSE)) { |
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dgcLog.log(Log.VERBOSE, "vmid = " + vmid); |
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} |
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// create a VMID if one wasn't supplied |
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if (vmid == null) { |
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vmid = new VMID(); |
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180 |
if (dgcLog.isLoggable(Log.BRIEF)) { |
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String clientHost; |
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182 |
try { |
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clientHost = RemoteServer.getClientHost(); |
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} catch (ServerNotActiveException e) { |
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clientHost = "<unknown host>"; |
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} |
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dgcLog.log(Log.BRIEF, " assigning vmid " + vmid + |
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" to client " + clientHost); |
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189 |
} |
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} |
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192 |
lease = new Lease(vmid, duration); |
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// record lease information |
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synchronized (leaseTable) { |
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LeaseInfo info = leaseTable.get(vmid); |
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196 |
if (info == null) { |
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197 |
leaseTable.put(vmid, new LeaseInfo(vmid, duration)); |
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198 |
if (checker == null) { |
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checker = scheduler.scheduleWithFixedDelay( |
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new Runnable() { |
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public void run() { |
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checkLeases(); |
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203 |
} |
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}, |
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leaseCheckInterval, |
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leaseCheckInterval, TimeUnit.MILLISECONDS); |
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} |
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} else { |
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info.renew(duration); |
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} |
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} |
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213 |
for (ObjID id : ids) { |
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214 |
if (dgcLog.isLoggable(Log.VERBOSE)) { |
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215 |
dgcLog.log(Log.VERBOSE, "id = " + id + |
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", vmid = " + vmid + ", duration = " + duration); |
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217 |
} |
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||
219 |
ObjectTable.referenced(id, sequenceNum, vmid); |
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} |
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222 |
// return the VMID used |
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223 |
return lease; |
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} |
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225 |
||
226 |
/** |
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227 |
* The clean call removes the VMID from the set of clients |
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228 |
* that hold references to the object associated with the LiveRef |
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229 |
* ref. The sequence number is used to detect late clean calls. If the |
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230 |
* argument "strong" is true, then the clean call is a result of a |
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231 |
* failed "dirty" call, thus the sequence number for the VMID needs |
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232 |
* to be remembered until the client goes away. |
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*/ |
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234 |
public void clean(ObjID[] ids, long sequenceNum, VMID vmid, boolean strong) |
|
235 |
{ |
|
236 |
for (ObjID id : ids) { |
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237 |
if (dgcLog.isLoggable(Log.VERBOSE)) { |
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238 |
dgcLog.log(Log.VERBOSE, "id = " + id + |
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", vmid = " + vmid + ", strong = " + strong); |
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240 |
} |
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242 |
ObjectTable.unreferenced(id, sequenceNum, vmid, strong); |
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} |
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} |
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245 |
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246 |
/** |
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* Register interest in receiving a callback when this VMID |
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248 |
* becomes inaccessible. |
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*/ |
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250 |
void registerTarget(VMID vmid, Target target) { |
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synchronized (leaseTable) { |
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LeaseInfo info = leaseTable.get(vmid); |
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253 |
if (info == null) { |
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target.vmidDead(vmid); |
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255 |
} else { |
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256 |
info.notifySet.add(target); |
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257 |
} |
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258 |
} |
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259 |
} |
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260 |
||
261 |
/** |
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262 |
* Remove notification request. |
|
263 |
*/ |
|
264 |
void unregisterTarget(VMID vmid, Target target) { |
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265 |
synchronized (leaseTable) { |
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266 |
LeaseInfo info = leaseTable.get(vmid); |
|
267 |
if (info != null) { |
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info.notifySet.remove(target); |
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269 |
} |
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270 |
} |
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} |
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272 |
||
273 |
/** |
|
274 |
* Check if leases have expired. If a lease has expired, remove |
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275 |
* it from the table and notify all interested parties that the |
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276 |
* VMID is essentially "dead". |
|
277 |
* |
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278 |
* @return if true, there are leases outstanding; otherwise leases |
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279 |
* no longer need to be checked |
|
280 |
*/ |
|
281 |
private void checkLeases() { |
|
282 |
long time = System.currentTimeMillis(); |
|
283 |
||
284 |
/* List of vmids that need to be removed from the leaseTable */ |
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558b0e0d5910
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khazra
parents:
5506
diff
changeset
|
285 |
List<LeaseInfo> toUnregister = new ArrayList<>(); |
2 | 286 |
|
287 |
/* Build a list of leaseInfo objects that need to have |
|
288 |
* targets removed from their notifySet. Remove expired |
|
289 |
* leases from leaseTable. |
|
290 |
*/ |
|
291 |
synchronized (leaseTable) { |
|
292 |
Iterator<LeaseInfo> iter = leaseTable.values().iterator(); |
|
293 |
while (iter.hasNext()) { |
|
294 |
LeaseInfo info = iter.next(); |
|
295 |
if (info.expired(time)) { |
|
296 |
toUnregister.add(info); |
|
297 |
iter.remove(); |
|
298 |
} |
|
299 |
} |
|
300 |
||
301 |
if (leaseTable.isEmpty()) { |
|
302 |
checker.cancel(false); |
|
303 |
checker = null; |
|
304 |
} |
|
305 |
} |
|
306 |
||
307 |
/* Notify and unegister targets without holding the lock on |
|
308 |
* the leaseTable so we avoid deadlock. |
|
309 |
*/ |
|
310 |
for (LeaseInfo info : toUnregister) { |
|
311 |
for (Target target : info.notifySet) { |
|
312 |
target.vmidDead(info.vmid); |
|
313 |
} |
|
314 |
} |
|
315 |
} |
|
316 |
||
317 |
static { |
|
318 |
/* |
|
319 |
* "Export" the singleton DGCImpl in a context isolated from |
|
320 |
* the arbitrary current thread context. |
|
321 |
*/ |
|
322 |
AccessController.doPrivileged(new PrivilegedAction<Void>() { |
|
323 |
public Void run() { |
|
324 |
ClassLoader savedCcl = |
|
325 |
Thread.currentThread().getContextClassLoader(); |
|
326 |
try { |
|
327 |
Thread.currentThread().setContextClassLoader( |
|
328 |
ClassLoader.getSystemClassLoader()); |
|
329 |
||
330 |
/* |
|
331 |
* Put remote collector object in table by hand to prevent |
|
332 |
* listen on port. (UnicastServerRef.exportObject would |
|
333 |
* cause transport to listen.) |
|
334 |
*/ |
|
335 |
try { |
|
336 |
dgc = new DGCImpl(); |
|
337 |
ObjID dgcID = new ObjID(ObjID.DGC_ID); |
|
338 |
LiveRef ref = new LiveRef(dgcID, 0); |
|
43211 | 339 |
UnicastServerRef disp = new UnicastServerRef(ref, |
340 |
DGCImpl::checkInput); |
|
2 | 341 |
Remote stub = |
342 |
Util.createProxy(DGCImpl.class, |
|
343 |
new UnicastRef(ref), true); |
|
344 |
disp.setSkeleton(dgc); |
|
33288 | 345 |
|
346 |
Permissions perms = new Permissions(); |
|
347 |
perms.add(new SocketPermission("*", "accept,resolve")); |
|
348 |
ProtectionDomain[] pd = { new ProtectionDomain(null, perms) }; |
|
349 |
AccessControlContext acceptAcc = new AccessControlContext(pd); |
|
350 |
||
351 |
Target target = AccessController.doPrivileged( |
|
352 |
new PrivilegedAction<Target>() { |
|
353 |
public Target run() { |
|
354 |
return new Target(dgc, disp, stub, dgcID, true); |
|
355 |
} |
|
356 |
}, acceptAcc); |
|
357 |
||
2 | 358 |
ObjectTable.putTarget(target); |
359 |
} catch (RemoteException e) { |
|
360 |
throw new Error( |
|
361 |
"exception initializing server-side DGC", e); |
|
362 |
} |
|
363 |
} finally { |
|
364 |
Thread.currentThread().setContextClassLoader(savedCcl); |
|
365 |
} |
|
366 |
return null; |
|
367 |
} |
|
368 |
}); |
|
369 |
} |
|
370 |
||
43211 | 371 |
/** |
372 |
* ObjectInputFilter to filter DGC input objects. |
|
373 |
* The list of acceptable classes is very short and explicit. |
|
374 |
* The depth and array sizes are limited. |
|
375 |
* |
|
376 |
* @param filterInfo access to class, arrayLength, etc. |
|
377 |
* @return {@link ObjectInputFilter.Status#ALLOWED} if allowed, |
|
378 |
* {@link ObjectInputFilter.Status#REJECTED} if rejected, |
|
379 |
* otherwise {@link ObjectInputFilter.Status#UNDECIDED} |
|
380 |
*/ |
|
381 |
private static ObjectInputFilter.Status checkInput(ObjectInputFilter.FilterInfo filterInfo) { |
|
382 |
if (dgcFilter != null) { |
|
383 |
ObjectInputFilter.Status status = dgcFilter.checkInput(filterInfo); |
|
384 |
if (status != ObjectInputFilter.Status.UNDECIDED) { |
|
385 |
// The DGC filter can override the built-in white-list |
|
386 |
return status; |
|
387 |
} |
|
388 |
} |
|
389 |
||
390 |
if (filterInfo.depth() > DGC_MAX_DEPTH) { |
|
391 |
return ObjectInputFilter.Status.REJECTED; |
|
392 |
} |
|
393 |
Class<?> clazz = filterInfo.serialClass(); |
|
394 |
if (clazz != null) { |
|
395 |
while (clazz.isArray()) { |
|
396 |
if (filterInfo.arrayLength() >= 0 && filterInfo.arrayLength() > DGC_MAX_ARRAY_SIZE) { |
|
397 |
return ObjectInputFilter.Status.REJECTED; |
|
398 |
} |
|
399 |
// Arrays are allowed depending on the component type |
|
400 |
clazz = clazz.getComponentType(); |
|
401 |
} |
|
402 |
if (clazz.isPrimitive()) { |
|
403 |
// Arrays of primitives are allowed |
|
404 |
return ObjectInputFilter.Status.ALLOWED; |
|
405 |
} |
|
406 |
return (clazz == ObjID.class || |
|
407 |
clazz == UID.class || |
|
408 |
clazz == VMID.class || |
|
409 |
clazz == Lease.class) |
|
410 |
? ObjectInputFilter.Status.ALLOWED |
|
411 |
: ObjectInputFilter.Status.REJECTED; |
|
412 |
} |
|
413 |
// Not a class, not size limited |
|
414 |
return ObjectInputFilter.Status.UNDECIDED; |
|
415 |
} |
|
416 |
||
417 |
||
2 | 418 |
private static class LeaseInfo { |
419 |
VMID vmid; |
|
420 |
long expiration; |
|
12040
558b0e0d5910
7146763: Warnings cleanup in the sun.rmi and related packages
khazra
parents:
5506
diff
changeset
|
421 |
Set<Target> notifySet = new HashSet<>(); |
2 | 422 |
|
423 |
LeaseInfo(VMID vmid, long lease) { |
|
424 |
this.vmid = vmid; |
|
425 |
expiration = System.currentTimeMillis() + lease; |
|
426 |
} |
|
427 |
||
428 |
synchronized void renew(long lease) { |
|
429 |
long newExpiration = System.currentTimeMillis() + lease; |
|
430 |
if (newExpiration > expiration) |
|
431 |
expiration = newExpiration; |
|
432 |
} |
|
433 |
||
434 |
boolean expired(long time) { |
|
435 |
if (expiration < time) { |
|
436 |
if (dgcLog.isLoggable(Log.BRIEF)) { |
|
437 |
dgcLog.log(Log.BRIEF, vmid.toString()); |
|
438 |
} |
|
439 |
return true; |
|
440 |
} else { |
|
441 |
return false; |
|
442 |
} |
|
443 |
} |
|
444 |
} |
|
445 |
} |