/*

 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

#include <windows.h>

#include "jni.h"

#include "net_util.h"

#include "sun_net_PortConfig.h"

#ifdef __cplusplus

extern "C" {

#endif

struct portrange {

    int lower;

    int higher;

};

static int getPortRange(struct portrange *range)

{

    OSVERSIONINFO ver;

    ver.dwOSVersionInfoSize = sizeof(ver);

    GetVersionEx(&ver);

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

    if (ver.dwMajorVersion <= 5) {

        LONG ret;

        HKEY hKey;

        range->lower = 1024;

        range->higher = 4999;

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

        ret = RegOpenKeyEx(HKEY_LOCAL_MACHINE,

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

                   0, KEY_READ, (PHKEY)&hKey

        );

        if (ret == ERROR_SUCCESS) {

            DWORD maxuserport;

            ULONG ulType;

            DWORD dwLen = sizeof(maxuserport);

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

                             (LPBYTE)&maxuserport, &dwLen);

            RegCloseKey(hKey);

            if (ret == ERROR_SUCCESS) {

                range->higher = maxuserport;

            }

        }

    } else {

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

          * is affected, but is not sufficient to determine.

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

          */

        range->lower = 49152;

        range->higher = 65535;

    }

    return 0;

}

/*

 * Class:     sun_net_PortConfig

 * Method:    getLower0

 * Signature: ()I

 */

JNIEXPORT jint JNICALL Java_sun_net_PortConfig_getLower0

  (JNIEnv *env, jclass clazz)

{

    struct portrange range;

    getPortRange(&range);

    return range.lower;

}

/*

 * Class:     sun_net_PortConfig

 * Method:    getUpper0

 * Signature: ()I

 */

JNIEXPORT jint JNICALL Java_sun_net_PortConfig_getUpper0

  (JNIEnv *env, jclass clazz)

{

    struct portrange range;

    getPortRange(&range);

    return range.higher;

}

#ifdef __cplusplus

}

#endif