/*

 * Copyright (c) 1998, 2016, 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 "net_util.h"

#include "java_net_InetAddress.h"

int IPv6_supported();

int reuseport_supported();

static int IPv6_available;

static int REUSEPORT_available;

JNIEXPORT jint JNICALL ipv6_available()

{

    return IPv6_available;

}

JNIEXPORT jint JNICALL reuseport_available()

{

    return REUSEPORT_available;

}

JNIEXPORT jint JNICALL

DEF_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) {

        return JNI_EVERSION; /* JNI version not supported */

    }

    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);

    /* check if SO_REUSEPORT is supported on this platform */

    REUSEPORT_available = reuseport_supported();

    platformInit();

    parseExclusiveBindProperty(env);

    return JNI_VERSION_1_2;

}

static int initialized = 0;

JNIEXPORT void JNICALL initInetAddressIDs(JNIEnv *env) {

    if (!initialized) {

        Java_java_net_InetAddress_init(env, 0);

        JNU_CHECK_EXCEPTION(env);

        Java_java_net_Inet4Address_init(env, 0);

        JNU_CHECK_EXCEPTION(env);

        Java_java_net_Inet6Address_init(env, 0);

        JNU_CHECK_EXCEPTION(env);

        initialized = 1;

    }

}

/* The address, and family fields used to be in InetAddress

 * but are now in an implementation object. So, there is an extra

 * level of indirection to access them now.

 */

extern jclass iac_class;

extern jfieldID ia_holderID;

extern jfieldID iac_addressID;

extern jfieldID iac_familyID;

/**

 * set_ methods return JNI_TRUE on success JNI_FALSE on error

 * get_ methods that return +ve int return -1 on error

 * get_ methods that return objects return NULL on error.

 */

jobject getInet6Address_scopeifname(JNIEnv *env, jobject iaObj) {

    jobject holder = (*env)->GetObjectField(env, iaObj, ia6_holder6ID);

    CHECK_NULL_RETURN(holder, NULL);

    return (*env)->GetObjectField(env, holder, ia6_scopeifnameID);

}

jboolean setInet6Address_scopeifname(JNIEnv *env, jobject iaObj, jobject scopeifname) {

    jobject holder = (*env)->GetObjectField(env, iaObj, ia6_holder6ID);

    CHECK_NULL_RETURN(holder, JNI_FALSE);

    (*env)->SetObjectField(env, holder, ia6_scopeifnameID, scopeifname);

    return JNI_TRUE;

}

int getInet6Address_scopeid_set(JNIEnv *env, jobject iaObj) {

    jobject holder = (*env)->GetObjectField(env, iaObj, ia6_holder6ID);

    CHECK_NULL_RETURN(holder, -1);

    return (*env)->GetBooleanField(env, holder, ia6_scopeidsetID);

}

int getInet6Address_scopeid(JNIEnv *env, jobject iaObj) {

    jobject holder = (*env)->GetObjectField(env, iaObj, ia6_holder6ID);

    CHECK_NULL_RETURN(holder, -1);

    return (*env)->GetIntField(env, holder, ia6_scopeidID);

}

jboolean setInet6Address_scopeid(JNIEnv *env, jobject iaObj, int scopeid) {

    jobject holder = (*env)->GetObjectField(env, iaObj, ia6_holder6ID);

    CHECK_NULL_RETURN(holder, JNI_FALSE);

    (*env)->SetIntField(env, holder, ia6_scopeidID, scopeid);

    if (scopeid > 0) {

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

    }

    return JNI_TRUE;

}

jboolean getInet6Address_ipaddress(JNIEnv *env, jobject iaObj, char *dest) {

    jobject holder, addr;

    holder = (*env)->GetObjectField(env, iaObj, ia6_holder6ID);

    CHECK_NULL_RETURN(holder, JNI_FALSE);

    addr =  (*env)->GetObjectField(env, holder, ia6_ipaddressID);

    CHECK_NULL_RETURN(addr, JNI_FALSE);

    (*env)->GetByteArrayRegion(env, addr, 0, 16, (jbyte *)dest);

    return JNI_TRUE;

}

jboolean setInet6Address_ipaddress(JNIEnv *env, jobject iaObj, char *address) {

    jobject holder;

    jbyteArray addr;

    holder = (*env)->GetObjectField(env, iaObj, ia6_holder6ID);

    CHECK_NULL_RETURN(holder, JNI_FALSE);

    addr =  (jbyteArray)(*env)->GetObjectField(env, holder, ia6_ipaddressID);

    if (addr == NULL) {

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

        CHECK_NULL_RETURN(addr, JNI_FALSE);

        (*env)->SetObjectField(env, holder, ia6_ipaddressID, addr);

    }

    (*env)->SetByteArrayRegion(env, addr, 0, 16, (jbyte *)address);

    return JNI_TRUE;

}

void setInetAddress_addr(JNIEnv *env, jobject iaObj, int address) {

    jobject holder = (*env)->GetObjectField(env, iaObj, ia_holderID);

    (*env)->SetIntField(env, holder, iac_addressID, address);

}

void setInetAddress_family(JNIEnv *env, jobject iaObj, int family) {

    jobject holder = (*env)->GetObjectField(env, iaObj, ia_holderID);

    (*env)->SetIntField(env, holder, iac_familyID, family);

}

void setInetAddress_hostName(JNIEnv *env, jobject iaObj, jobject host) {

    jobject holder = (*env)->GetObjectField(env, iaObj, ia_holderID);

    (*env)->SetObjectField(env, holder, iac_hostNameID, host);

    (*env)->SetObjectField(env, holder, iac_origHostNameID, host);

}

int getInetAddress_addr(JNIEnv *env, jobject iaObj) {

    jobject holder = (*env)->GetObjectField(env, iaObj, ia_holderID);

    return (*env)->GetIntField(env, holder, iac_addressID);

}

int getInetAddress_family(JNIEnv *env, jobject iaObj) {

    jobject holder = (*env)->GetObjectField(env, iaObj, ia_holderID);

    return (*env)->GetIntField(env, holder, iac_familyID);

}

jobject getInetAddress_hostName(JNIEnv *env, jobject iaObj) {

    jobject holder = (*env)->GetObjectField(env, iaObj, ia_holderID);

    return (*env)->GetObjectField(env, holder, iac_hostNameID);

}

JNIEXPORT jobject JNICALL

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

    jobject iaObj;

    if (him->sa_family == AF_INET6) {

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

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

        if (NET_IsIPv4Mapped(caddr)) {

            int address;

            iaObj = (*env)->NewObject(env, ia4_class, ia4_ctrID);

            CHECK_NULL_RETURN(iaObj, NULL);

            address = NET_IPv4MappedToIPv4(caddr);

            setInetAddress_addr(env, iaObj, address);

            setInetAddress_family(env, iaObj, java_net_InetAddress_IPv4);

        } else {

            jint scope;

            jboolean ret;

            iaObj = (*env)->NewObject(env, ia6_class, ia6_ctrID);

            CHECK_NULL_RETURN(iaObj, NULL);

            ret = setInet6Address_ipaddress(env, iaObj, (char *)&(him6->sin6_addr));

            if (ret == JNI_FALSE)

                return NULL;

            setInetAddress_family(env, iaObj, java_net_InetAddress_IPv6);

            scope = getScopeID(him);

            setInet6Address_scopeid(env, iaObj, scope);

        }

        *port = ntohs(him6->sin6_port);

    return iaObj;

}

JNIEXPORT jint JNICALL

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

{

    jint family = AF_INET;

    family = getInetAddress_family(env, iaObj) == java_net_InetAddress_IPv4 ?

        AF_INET : AF_INET6;

    if (him->sa_family == AF_INET6) {

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

        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);

            addrCur = getInetAddress_addr(env, iaObj);

            if (addrNew == addrCur) {

                return JNI_TRUE;

            } else {

                return JNI_FALSE;

            }

        } else {

            jbyte caddrCur[16];

            int scope;

            if (family == AF_INET) {

                return JNI_FALSE;

            }

            scope = getInet6Address_scopeid(env, iaObj);

            getInet6Address_ipaddress(env, iaObj, (char *)caddrCur);

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

                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);

}