1 /* 2 * Copyright (c) 2013, Oracle and/or its affiliates. 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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package java.net; 27 28 import java.security.AccessController; 29 import java.security.PrivilegedExceptionAction; 30 31 class NetUtil { 32 33 // Value of jdk.net.revealLocalAddress 34 private static boolean revealLocalAddress; 35 36 // True if jdk.net.revealLocalAddress had been read 37 private static volatile boolean propRevealLocalAddr; 38 39 /* 40 * Returns true if security check on localAddress is disabled 41 */ doRevealLocalAddress()42 static boolean doRevealLocalAddress() { 43 return propRevealLocalAddr ? revealLocalAddress 44 : readRevealLocalAddr(); 45 46 } 47 readRevealLocalAddr()48 private static boolean readRevealLocalAddr() { 49 SecurityManager sm = System.getSecurityManager(); 50 if (sm != null) { 51 try { 52 revealLocalAddress = Boolean.parseBoolean( 53 AccessController.doPrivileged( 54 new PrivilegedExceptionAction<String>() { 55 @Override 56 public String run() { 57 return System.getProperty( 58 "jdk.net.revealLocalAddress"); 59 } 60 })); 61 62 } catch (Exception e) { 63 //revealLocalAddress is false 64 } 65 propRevealLocalAddr = true; 66 } 67 /* 68 * No security manager, or security check passed or 69 * jdk.net.revealLocalAddress set to true 70 */ 71 return revealLocalAddress; 72 } 73 74 } 75