/*

 * Copyright (c) 1998, 2012, 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 "jni.h"

#include "jvm.h"

#include "jni_util.h"

#include "net_util.h"

int IPv6_supported() ;

static int IPv6_available;

JNIEXPORT jint JNICALL ipv6_available()

{

    return IPv6_available ;

}

JNIEXPORT jint JNICALL

JNI_OnLoad(JavaVM *vm, void *reserved)

{

    JNIEnv *env;

    jclass iCls;

    jmethodID mid;

    jstring s;

    jint preferIPv4Stack;

    if ((*vm)->GetEnv(vm, (void **)&env, JNI_VERSION_1_2) == JNI_OK) {

        if (JVM_InitializeSocketLibrary() < 0) {

            JNU_ThrowByName(env, "java/lang/UnsatisfiedLinkError",

                            "failed to initialize net library.");

            return JNI_VERSION_1_2;

        }

    }

    iCls = (*env)->FindClass(env, "java/lang/Boolean");

    CHECK_NULL_RETURN(iCls, JNI_VERSION_1_2);

    mid = (*env)->GetStaticMethodID(env, iCls, "getBoolean", "(Ljava/lang/String;)Z");

    CHECK_NULL_RETURN(mid, JNI_VERSION_1_2);

    s = (*env)->NewStringUTF(env, "java.net.preferIPv4Stack");

    CHECK_NULL_RETURN(s, JNI_VERSION_1_2);

    preferIPv4Stack = (*env)->CallStaticBooleanMethod(env, iCls, mid, s);

    /*

       Since we have initialized and loaded the Socket library we will

       check now to whether we have IPv6 on this platform and if the

       supporting socket APIs are available

    */

    IPv6_available = IPv6_supported() & (!preferIPv4Stack);

    initLocalAddrTable ();

    parseExclusiveBindProperty(env);

    return JNI_VERSION_1_2;

}

static int initialized = 0;

void init(JNIEnv *env) {

    if (!initialized) {

        Java_java_net_InetAddress_init(env, 0);

        Java_java_net_Inet4Address_init(env, 0);

        Java_java_net_Inet6Address_init(env, 0);

        initialized = 1;

    }

}

JNIEXPORT jobject JNICALL

NET_SockaddrToInetAddress(JNIEnv *env, struct sockaddr *him, int *port) {

    jobject iaObj;

    init(env);

#ifdef AF_INET6

    if (him->sa_family == AF_INET6) {

        jbyteArray ipaddress;

#ifdef WIN32

        struct SOCKADDR_IN6 *him6 = (struct SOCKADDR_IN6 *)him;

#else

        struct sockaddr_in6 *him6 = (struct sockaddr_in6 *)him;

#endif

        jbyte *caddr = (jbyte *)&(him6->sin6_addr);

        if (NET_IsIPv4Mapped(caddr)) {

            int address;

            static jclass inet4Cls = 0;

            if (inet4Cls == 0) {

                jclass c = (*env)->FindClass(env, "java/net/Inet4Address");

                CHECK_NULL_RETURN(c, NULL);

                inet4Cls = (*env)->NewGlobalRef(env, c);

                CHECK_NULL_RETURN(inet4Cls, NULL);

                (*env)->DeleteLocalRef(env, c);

            }

            iaObj = (*env)->NewObject(env, inet4Cls, ia4_ctrID);

            CHECK_NULL_RETURN(iaObj, NULL);

            address = NET_IPv4MappedToIPv4(caddr);

        } else {

            static jclass inet6Cls = 0;

            jint scope;

            if (inet6Cls == 0) {

                jclass c = (*env)->FindClass(env, "java/net/Inet6Address");

                CHECK_NULL_RETURN(c, NULL);

                inet6Cls = (*env)->NewGlobalRef(env, c);

                CHECK_NULL_RETURN(inet6Cls, NULL);

                (*env)->DeleteLocalRef(env, c);

            }

            iaObj = (*env)->NewObject(env, inet6Cls, ia6_ctrID);

            CHECK_NULL_RETURN(iaObj, NULL);

            ipaddress = (*env)->NewByteArray(env, 16);

            CHECK_NULL_RETURN(ipaddress, NULL);

            (*env)->SetByteArrayRegion(env, ipaddress, 0, 16,

                                       (jbyte *)&(him6->sin6_addr));

            (*env)->SetObjectField(env, iaObj, ia6_ipaddressID, ipaddress);

            scope = getScopeID(him);

            (*env)->SetIntField(env, iaObj, ia6_scopeidID, scope);

            if (scope > 0)

                (*env)->SetBooleanField(env, iaObj, ia6_scopeidsetID, JNI_TRUE);

        }

        *port = ntohs(him6->sin6_port);

    } else

#endif /* AF_INET6 */

        {

            struct sockaddr_in *him4 = (struct sockaddr_in *)him;

            static jclass inet4Cls = 0;

            if (inet4Cls == 0) {

                jclass c = (*env)->FindClass(env, "java/net/Inet4Address");

                CHECK_NULL_RETURN(c, NULL);

                inet4Cls = (*env)->NewGlobalRef(env, c);

                CHECK_NULL_RETURN(inet4Cls, NULL);

                (*env)->DeleteLocalRef(env, c);

            }

            iaObj = (*env)->NewObject(env, inet4Cls, ia4_ctrID);

            CHECK_NULL_RETURN(iaObj, NULL);

            *port = ntohs(him4->sin_port);

        }

    return iaObj;

}

JNIEXPORT jint JNICALL

NET_SockaddrEqualsInetAddress(JNIEnv *env, struct sockaddr *him, jobject iaObj)

{

    jint family = AF_INET;

#ifdef AF_INET6

    if (him->sa_family == AF_INET6) {

#ifdef WIN32

        struct SOCKADDR_IN6 *him6 = (struct SOCKADDR_IN6 *)him;

#else

        struct sockaddr_in6 *him6 = (struct sockaddr_in6 *)him;

#endif

        jbyte *caddrNew = (jbyte *)&(him6->sin6_addr);

        if (NET_IsIPv4Mapped(caddrNew)) {

            int addrNew;

            int addrCur;

            if (family == AF_INET6) {

                return JNI_FALSE;

            }

            addrNew = NET_IPv4MappedToIPv4(caddrNew);

            if (addrNew == addrCur) {

                return JNI_TRUE;

            } else {

                return JNI_FALSE;

            }

        } else {

            jbyteArray ipaddress;

            jbyte caddrCur[16];

            int scope;

            if (family == AF_INET) {

                return JNI_FALSE;

            }

            ipaddress = (*env)->GetObjectField(env, iaObj, ia6_ipaddressID);

            scope = (*env)->GetIntField(env, iaObj, ia6_scopeidID);

            (*env)->GetByteArrayRegion(env, ipaddress, 0, 16, caddrCur);

            if (NET_IsEqual(caddrNew, caddrCur) && cmpScopeID(scope, him)) {

                return JNI_TRUE;

            } else {

                return JNI_FALSE;

            }

        }

    } else

#endif /* AF_INET6 */

        {

            struct sockaddr_in *him4 = (struct sockaddr_in *)him;

            int addrNew, addrCur;

            if (family != AF_INET) {

                return JNI_FALSE;

            }

            addrNew = ntohl(him4->sin_addr.s_addr);

            if (addrNew == addrCur) {

                return JNI_TRUE;

            } else {

                return JNI_FALSE;

            }

        }

}

unsigned short

in_cksum(unsigned short *addr, int len) {

    int nleft = len;

    int sum = 0;

    unsigned short *w = addr;

    unsigned short answer = 0;

    while(nleft > 1) {

        sum += *w++;

        nleft -= 2;

    }

    if (nleft == 1) {

        *(unsigned char *) (&answer) = *(unsigned char *)w;

        sum += answer;

    }

    sum = (sum >> 16) + (sum & 0xffff);

    sum += (sum >> 16);

    answer = ~sum;

    return (answer);

}