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92 lines
2.9 KiB
Java
92 lines
2.9 KiB
Java
/*
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* Copyright (c) 2013, 2023, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.net;
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import jdk.internal.util.OperatingSystem;
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/**
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* Determines the ephemeral port range in use on this system.
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* If this cannot be determined, then the default settings
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* of the OS are returned.
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*/
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public final class PortConfig {
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private static final int upper, lower;
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private PortConfig() {}
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static {
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jdk.internal.loader.BootLoader.loadLibrary("net");
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int defaultUpper;
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int defaultLower;
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switch (OperatingSystem.current()) {
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case LINUX:
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defaultLower = 32768;
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defaultUpper = 61000;
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break;
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case MACOS:
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defaultLower = 49152;
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defaultUpper = 65535;
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break;
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case AIX:
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// The ephemeral port is OS version dependent on AIX:
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// http://publib.boulder.ibm.com/infocenter/aix/v7r1/topic/com.ibm.aix.rsct315.admin/bl503_ephport.htm
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// However, on AIX 5.3 / 6.1 / 7.1 we always see the
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// settings below by using:
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// /usr/sbin/no -a | fgrep ephemeral
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defaultLower = 32768;
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defaultUpper = 65535;
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break;
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default:
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throw new InternalError("sun.net.PortConfig: unsupported OS: " + OperatingSystem.current());
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}
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int v = getLower0();
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if (v == -1) {
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v = defaultLower;
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}
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lower = v;
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v = getUpper0();
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if (v == -1) {
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v = defaultUpper;
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}
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upper = v;
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}
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static native int getLower0();
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static native int getUpper0();
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public static int getLower() {
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return lower;
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}
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public static int getUpper() {
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return upper;
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}
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}
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