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.access.SharedSecrets.getJavaLangAccess() 45 .loadLibrary(PortConfig.class, "net"); 46 String os = GetPropertyAction.privilegedGetProperty("os.name"); 47 if (os.startsWith("Linux")) { 48 defaultLower = 32768; 49 defaultUpper = 61000; 50 } else if (os.startsWith("SunOS")) { 51 defaultLower = 32768; 52 defaultUpper = 65535; 53 } else if (os.contains("OS X")) { 54 defaultLower = 49152; 55 defaultUpper = 65535; 56 } else if (os.startsWith("AIX")) { 57 // The ephemeral port is OS version dependent on AIX: 58 // http://publib.boulder.ibm.com/infocenter/aix/v7r1/topic/com.ibm.aix.rsct315.admin/bl503_ephport.htm 59 // However, on AIX 5.3 / 6.1 / 7.1 we always see the 60 // settings below by using: 61 // /usr/sbin/no -a | fgrep ephemeral 62 defaultLower = 32768; 63 defaultUpper = 65535; 64 } else { 65 throw new InternalError( 66 "sun.net.PortConfig: unknown OS"); 67 } 68 69 int v = getLower0(); 70 if (v == -1) { 71 v = defaultLower; 72 } 73 lower = v; 74 75 v = getUpper0(); 76 if (v == -1) { 77 v = defaultUpper; 78 } 79 upper = v; 80 } 81 82 static native int getLower0(); 83 static native int getUpper0(); 84 85 public static int getLower() { 86 return lower; 87 } 88 89 public static int getUpper() { 90 return upper; 91 } 92 }