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 #include <windows.h>

    27 #include "jni.h"

    28 #include "net_util.h"

    29 #include "sun_net_PortConfig.h"

    30 

    31 #ifdef __cplusplus

    32 extern "C" {

    33 #endif

    34 

    35 struct portrange {

    36     int lower;

    37     int higher;

    38 };

    39 

    40 static int getPortRange(struct portrange *range)

    41 {

    42     OSVERSIONINFO ver;

    43     ver.dwOSVersionInfoSize = sizeof(ver);

    44     GetVersionEx(&ver);

    45 

    46     /* Check for major version 5 or less = Windows XP/2003 or older */

    47     if (ver.dwMajorVersion <= 5) {

    48         LONG ret;

    49         HKEY hKey;

    50         range->lower = 1024;

    51         range->higher = 4999;

    52 

    53         /* check registry to see if upper limit was raised */

    54         ret = RegOpenKeyEx(HKEY_LOCAL_MACHINE,

    55                    "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters",

    56                    0, KEY_READ, (PHKEY)&hKey

    57         );

    58         if (ret == ERROR_SUCCESS) {

    59             DWORD maxuserport;

    60             ULONG ulType;

    61             DWORD dwLen = sizeof(maxuserport);

    62             ret = RegQueryValueEx(hKey, "MaxUserPort",  NULL, &ulType,

    63                              (LPBYTE)&maxuserport, &dwLen);

    64             RegCloseKey(hKey);

    65             if (ret == ERROR_SUCCESS) {

    66                 range->higher = maxuserport;

    67             }

    68         }

    69     } else {

    70         /* There doesn't seem to be an API to access this. "MaxUserPort"

    71           * is affected, but is not sufficient to determine.

    72          * so we just use the defaults, which are less likely to change

    73           */

    74         range->lower = 49152;

    75         range->higher = 65535;

    76     }

    77     return 0;

    78 }

    79 

    80 /*

    81  * Class:     sun_net_PortConfig

    82  * Method:    getLower0

    83  * Signature: ()I

    84  */

    85 JNIEXPORT jint JNICALL Java_sun_net_PortConfig_getLower0

    86   (JNIEnv *env, jclass clazz)

    87 {

    88     struct portrange range;

    89     getPortRange(&range);

    90     return range.lower;

    91 }

    92 

    93 /*

    94  * Class:     sun_net_PortConfig

    95  * Method:    getUpper0

    96  * Signature: ()I

    97  */

    98 JNIEXPORT jint JNICALL Java_sun_net_PortConfig_getUpper0

    99   (JNIEnv *env, jclass clazz)

   100 {

   101     struct portrange range;

   102     getPortRange(&range);

   103     return range.higher;

   104 }

   105 #ifdef __cplusplus

   106 }

   107 #endif