src/java.base/share/native/libnet/InetAddress.c

/*
 * Copyright (c) 1997, 2022, 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 <string.h>

#include "java_net_InetAddress.h"
#include "net_util.h"

/************************************************************************
 * InetAddress
 */

jclass ia_class;
jclass iac_class;
jfieldID ia_holderID;
jfieldID iac_addressID;
jfieldID iac_familyID;
jfieldID iac_hostNameID;
jfieldID iac_origHostNameID;

static int ia_initialized = 0;

/*
 * Class:     java_net_InetAddress
 * Method:    init
 * Signature: ()V
 */
JNIEXPORT void JNICALL
Java_java_net_InetAddress_init(JNIEnv *env, jclass cls) {
    if (!ia_initialized) {
        jclass c = (*env)->FindClass(env,"java/net/InetAddress");
        CHECK_NULL(c);
        ia_class = (*env)->NewGlobalRef(env, c);
        CHECK_NULL(ia_class);
        c = (*env)->FindClass(env,"java/net/InetAddress$InetAddressHolder");
        CHECK_NULL(c);
        iac_class = (*env)->NewGlobalRef(env, c);
        CHECK_NULL(iac_class);
        ia_holderID = (*env)->GetFieldID(env, ia_class, "holder", "Ljava/net/InetAddress$InetAddressHolder;");
        CHECK_NULL(ia_holderID);

        iac_addressID = (*env)->GetFieldID(env, iac_class, "address", "I");
        CHECK_NULL(iac_addressID);
        iac_familyID = (*env)->GetFieldID(env, iac_class, "family", "I");
        CHECK_NULL(iac_familyID);
        iac_hostNameID = (*env)->GetFieldID(env, iac_class, "hostName", "Ljava/lang/String;");
        CHECK_NULL(iac_hostNameID);
        iac_origHostNameID = (*env)->GetFieldID(env, iac_class, "originalHostName", "Ljava/lang/String;");
        CHECK_NULL(iac_origHostNameID);
        ia_initialized = 1;
    }
}

/*
 * Class:     java_net_InetAddress
 * Method:    isIPv4Available
 * Signature: ()Z
 */
JNIEXPORT jboolean JNICALL
Java_java_net_InetAddress_isIPv4Available(JNIEnv *env, jclass clazz) {
    return ipv4_available();
}

/*
 * Class:     java_net_InetAddress
 * Method:    isIPv6Supported
 * Signature: ()Z
 */
JNIEXPORT jboolean JNICALL
Java_java_net_InetAddress_isIPv6Supported(JNIEnv *env, jclass clazz) {
    return ipv6_available();
}