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 sun.net; 27 28 import java.security.AccessController; 29 30 /** 31 * Determines the ephemeral port range in use on this system. 32 * If this cannot be determined, then the default settings 33 * of the OS are returned. 34 */ 35 36 public final class PortConfig { 37 38 private static int defaultUpper, defaultLower; 39 private final static int upper, lower; 40 41 private PortConfig() {} 42 43 static { 44 AccessController.doPrivileged( 45 new java.security.PrivilegedAction<Void>() { 46 public Void run() { 47 System.loadLibrary("net"); 48 String os = System.getProperty("os.name"); 49 if (os.startsWith("Linux")) { 50 defaultLower = 32768; 51 defaultUpper = 61000; 52 } else if (os.startsWith("SunOS")) { 53 defaultLower = 32768; 54 defaultUpper = 65535; 55 } else if (os.contains("OS X")) { 56 defaultLower = 49152; 57 defaultUpper = 65535; 58 } else { 59 throw new InternalError( 60 "sun.net.PortConfig: unknown OS"); 61 } 62 return null; 63 } 64 }); 65 66 int v = getLower0(); 67 if (v == -1) { 68 v = defaultLower; 69 } 70 lower = v; 71 72 v = getUpper0(); 73 if (v == -1) { 74 v = defaultUpper; 75 } 76 upper = v; 77 } 78 79 static native int getLower0(); 80 static native int getUpper0(); 81 82 public static int getLower() { 83 return lower; 84 } 85 86 public static int getUpper() { 87 return upper; 88 } 89 }