/*
* Copyright (c) 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
* or visit www.oracle.com if you need additional information or have any
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*/
package java.net;
import java.security.AccessController;
import java.security.PrivilegedExceptionAction;
class NetUtil {
// Value of jdk.net.revealLocalAddress
private static boolean revealLocalAddress;
// True if jdk.net.revealLocalAddress had been read
private static volatile boolean propRevealLocalAddr;
/*
* Returns true if security check on localAddress is disabled
*/
static boolean doRevealLocalAddress() {
return propRevealLocalAddr ? revealLocalAddress
: readRevealLocalAddr();
}
private static boolean readRevealLocalAddr() {
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
try {
revealLocalAddress = Boolean.parseBoolean(
AccessController.doPrivileged(
new PrivilegedExceptionAction<String>() {
@Override
public String run() {
return System.getProperty(
"jdk.net.revealLocalAddress");
}
}));
} catch (Exception e) {
//revealLocalAddress is false
}
propRevealLocalAddr = true;
}
/*
* No security manager, or security check passed or
* jdk.net.revealLocalAddress set to true
*/
return revealLocalAddress;
}
}