1 /* 2 * Copyright (c) 2013, 2019, 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 sun.security.action.GetPropertyAction; 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 static final int upper, lower; 40 41 private PortConfig() {} 42 43 static { 44 jdk.internal.loader.BootLoader.loadLibrary("net"); 45 String os = GetPropertyAction.privilegedGetProperty("os.name"); 46 if (os.startsWith("Linux")) { 47 defaultLower = 32768; 48 defaultUpper = 61000; 49 } else if (os.contains("OS X")) { 50 defaultLower = 49152; 51 defaultUpper = 65535; 52 } else if (os.startsWith("AIX")) { 53 // The ephemeral port is OS version dependent on AIX: 54 // http://publib.boulder.ibm.com/infocenter/aix/v7r1/topic/com.ibm.aix.rsct315.admin/bl503_ephport.htm 55 // However, on AIX 5.3 / 6.1 / 7.1 we always see the 56 // settings below by using: 57 // /usr/sbin/no -a | fgrep ephemeral 58 defaultLower = 32768; 59 defaultUpper = 65535; 60 } else { 61 throw new InternalError( 62 "sun.net.PortConfig: unknown OS"); 63 } 64 65 int v = getLower0(); 66 if (v == -1) { 67 v = defaultLower; 68 } 69 lower = v; 70 71 v = getUpper0(); 72 if (v == -1) { 73 v = defaultUpper; 74 } 75 upper = v; 76 } 77 78 static native int getLower0(); 79 static native int getUpper0(); 80 81 public static int getLower() { 82 return lower; 83 } 84 85 public static int getUpper() { 86 return upper; 87 } 88 }