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 static final int upper, lower;
40
41 private PortConfig() {}
42
43 static {
44 AccessController.doPrivileged(
45 new java.security.PrivilegedAction<>() {
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 if (os.startsWith("AIX")) {
59 // The ephemeral port is OS version dependent on AIX:
60 // http://publib.boulder.ibm.com/infocenter/aix/v7r1/topic/com.ibm.aix.rsct315.admin/bl503_ephport.htm
61 // However, on AIX 5.3 / 6.1 / 7.1 we always see the
62 // settings below by using:
63 // /usr/sbin/no -a | fgrep ephemeral
64 defaultLower = 32768;
65 defaultUpper = 65535;
66 } else {
67 throw new InternalError(
68 "sun.net.PortConfig: unknown OS");
69 }
70 return null;
71 }
72 });
73
74 int v = getLower0();
75 if (v == -1) {
76 v = defaultLower;
77 }
78 lower = v;
79
80 v = getUpper0();
81 if (v == -1) {
82 v = defaultUpper;
83 }
84 upper = v;
85 }
86
87 static native int getLower0();
88 static native int getUpper0();
89
90 public static int getLower() {
91 return lower;
92 }
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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().loadLibrary("net");
45 String os = GetPropertyAction.privilegedGetProperty("os.name");
46 if (os.startsWith("Linux")) {
47 defaultLower = 32768;
48 defaultUpper = 61000;
49 } else if (os.startsWith("SunOS")) {
50 defaultLower = 32768;
51 defaultUpper = 65535;
52 } else if (os.contains("OS X")) {
53 defaultLower = 49152;
54 defaultUpper = 65535;
55 } else if (os.startsWith("AIX")) {
56 // The ephemeral port is OS version dependent on AIX:
57 // http://publib.boulder.ibm.com/infocenter/aix/v7r1/topic/com.ibm.aix.rsct315.admin/bl503_ephport.htm
58 // However, on AIX 5.3 / 6.1 / 7.1 we always see the
59 // settings below by using:
60 // /usr/sbin/no -a | fgrep ephemeral
61 defaultLower = 32768;
62 defaultUpper = 65535;
63 } else {
64 throw new InternalError(
65 "sun.net.PortConfig: unknown OS");
66 }
67
68 int v = getLower0();
69 if (v == -1) {
70 v = defaultLower;
71 }
72 lower = v;
73
74 v = getUpper0();
75 if (v == -1) {
76 v = defaultUpper;
77 }
78 upper = v;
79 }
80
81 static native int getLower0();
82 static native int getUpper0();
83
84 public static int getLower() {
85 return lower;
86 }
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