/*

 * Copyright (c) 2001, 2019, 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 <winsock2.h>

#include "jni.h"

#include "jni_util.h"

#include "jvm.h"

#include "jlong.h"

#include "nio.h"

#include "nio_util.h"

#include "net_util.h"

#include "sun_nio_ch_Net.h"

#include "sun_nio_ch_PollArrayWrapper.h"

/**

 * Definitions to allow for building with older SDK include files.

 */

#ifndef MCAST_BLOCK_SOURCE

#define MCAST_BLOCK_SOURCE          43

#define MCAST_UNBLOCK_SOURCE        44

#define MCAST_JOIN_SOURCE_GROUP     45

#define MCAST_LEAVE_SOURCE_GROUP    46

#endif  /* MCAST_BLOCK_SOURCE */

struct my_ip_mreq_source {

    IN_ADDR imr_multiaddr;

    IN_ADDR imr_sourceaddr;

    IN_ADDR imr_interface;

};

struct my_group_source_req {

    ULONG gsr_interface;

    SOCKADDR_STORAGE gsr_group;

    SOCKADDR_STORAGE gsr_source;

};

/**

 * Copy IPv6 address as jbytearray to target

 */

#define COPY_INET6_ADDRESS(env, source, target) \

    (*env)->GetByteArrayRegion(env, source, 0, 16, target)

/**

 * Enable or disable receipt of WSAECONNRESET errors.

 */

static void setConnectionReset(SOCKET s, BOOL enable) {

    DWORD bytesReturned = 0;

    WSAIoctl(s, SIO_UDP_CONNRESET, &enable, sizeof(enable),

             NULL, 0, &bytesReturned, NULL, NULL);

}

jint handleSocketError(JNIEnv *env, int errorValue)

{

    NET_ThrowNew(env, errorValue, NULL);

    return IOS_THROWN;

}

JNIEXPORT void JNICALL

Java_sun_nio_ch_Net_initIDs(JNIEnv *env, jclass clazz)

{

}

JNIEXPORT jboolean JNICALL

Java_sun_nio_ch_Net_isIPv6Available0(JNIEnv* env, jclass cl)

{

    /*

     * Return true if IPv6 is configured

     */

    return ipv6_available() ? JNI_TRUE : JNI_FALSE;

}

JNIEXPORT jboolean JNICALL

Java_sun_nio_ch_Net_isReusePortAvailable0(JNIEnv* env, jclass c1)

{

    // SO_REUSEPORT is not supported on Windows

    return JNI_FALSE;

}

JNIEXPORT jint JNICALL

Java_sun_nio_ch_Net_isExclusiveBindAvailable(JNIEnv *env, jclass clazz) {

    return 1;

}

JNIEXPORT jboolean JNICALL

Java_sun_nio_ch_Net_canIPv6SocketJoinIPv4Group0(JNIEnv* env, jclass cl)

{

    return JNI_FALSE;

}

JNIEXPORT jboolean JNICALL

Java_sun_nio_ch_Net_canJoin6WithIPv4Group0(JNIEnv* env, jclass cl)

{

    return JNI_FALSE;

}

JNIEXPORT jint JNICALL

Java_sun_nio_ch_Net_socket0(JNIEnv *env, jclass cl, jboolean preferIPv6,

                            jboolean stream, jboolean reuse, jboolean fastLoopback)

{

    SOCKET s;

    int domain = (preferIPv6) ? AF_INET6 : AF_INET;

    s = socket(domain, (stream ? SOCK_STREAM : SOCK_DGRAM), 0);

    if (s != INVALID_SOCKET) {

        SetHandleInformation((HANDLE)s, HANDLE_FLAG_INHERIT, 0);

        /* IPV6_V6ONLY is true by default */

        if (domain == AF_INET6) {

            int opt = 0;

            setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY,

                       (const char *)&opt, sizeof(opt));

        }

        /* Disable WSAECONNRESET errors for initially unconnected UDP sockets */

        if (!stream) {

            setConnectionReset(s, FALSE);

        }

    } else {

        NET_ThrowNew(env, WSAGetLastError(), "socket");

    }

    if (stream && fastLoopback) {

        static int loopback_available = 1;

        if (loopback_available) {

            int rv = NET_EnableFastTcpLoopback((jint)s);

            if (rv) {

                if (rv == WSAEOPNOTSUPP) {

                    loopback_available = 0;

                } else {

                    NET_ThrowNew(env, rv, "fastLoopback");

                }

            }

        }

    }

    return (jint)s;

}

JNIEXPORT void JNICALL

Java_sun_nio_ch_Net_bind0(JNIEnv *env, jclass clazz, jobject fdo, jboolean preferIPv6,

                          jboolean isExclBind, jobject iao, jint port)

{

    SOCKETADDRESS sa;

    int rv;

    int sa_len = 0;

    if (NET_InetAddressToSockaddr(env, iao, port, &sa, &sa_len, preferIPv6) != 0) {

        return;

    }

    rv = NET_WinBind(fdval(env, fdo), &sa, sa_len, isExclBind);

    if (rv == SOCKET_ERROR)

        NET_ThrowNew(env, WSAGetLastError(), "bind");

}

JNIEXPORT void JNICALL

Java_sun_nio_ch_Net_listen(JNIEnv *env, jclass cl, jobject fdo, jint backlog)

{

    if (listen(fdval(env,fdo), backlog) == SOCKET_ERROR) {

        NET_ThrowNew(env, WSAGetLastError(), "listen");

    }

}

JNIEXPORT jint JNICALL

Java_sun_nio_ch_Net_connect0(JNIEnv *env, jclass clazz, jboolean preferIPv6, jobject fdo,

                             jobject iao, jint port)

{

    SOCKETADDRESS sa;

    int rv;

    int sa_len = 0;

    SOCKET s = (SOCKET)fdval(env, fdo);

    if (NET_InetAddressToSockaddr(env, iao, port, &sa, &sa_len, preferIPv6) != 0) {

        return IOS_THROWN;

    }

    rv = connect(s, &sa.sa, sa_len);

    if (rv != 0) {

        int err = WSAGetLastError();

        if (err == WSAEINPROGRESS || err == WSAEWOULDBLOCK) {

            return IOS_UNAVAILABLE;

        }

        NET_ThrowNew(env, err, "connect");

        return IOS_THROWN;

    } else {

        /* Enable WSAECONNRESET errors when a UDP socket is connected */

        int type = 0, optlen = sizeof(type);

        rv = getsockopt(s, SOL_SOCKET, SO_TYPE, (char*)&type, &optlen);

        if (rv == 0 && type == SOCK_DGRAM) {

            setConnectionReset(s, TRUE);

        }

    }

    return 1;

}

JNIEXPORT jint JNICALL

Java_sun_nio_ch_Net_localPort(JNIEnv *env, jclass clazz, jobject fdo)

{

    SOCKETADDRESS sa;

    int sa_len = sizeof(sa);

    if (getsockname(fdval(env, fdo), &sa.sa, &sa_len) < 0) {

        int error = WSAGetLastError();

        if (error == WSAEINVAL) {

            return 0;

        }

        NET_ThrowNew(env, error, "getsockname");

        return IOS_THROWN;

    }

    return NET_GetPortFromSockaddr(&sa);

}

JNIEXPORT jobject JNICALL

Java_sun_nio_ch_Net_localInetAddress(JNIEnv *env, jclass clazz, jobject fdo)

{

    SOCKETADDRESS sa;

    int sa_len = sizeof(sa);

    int port;

    if (getsockname(fdval(env, fdo), &sa.sa, &sa_len) < 0) {

        NET_ThrowNew(env, WSAGetLastError(), "getsockname");

        return NULL;

    }

    return NET_SockaddrToInetAddress(env, &sa, &port);

}

JNIEXPORT jint JNICALL

Java_sun_nio_ch_Net_remotePort(JNIEnv *env, jclass clazz, jobject fdo)

{

    SOCKETADDRESS sa;

    int sa_len = sizeof(sa);

    if (getpeername(fdval(env, fdo), &sa.sa, &sa_len) < 0) {

        int error = WSAGetLastError();

        if (error == WSAEINVAL) {

            return 0;

        }

        NET_ThrowNew(env, error, "getsockname");

        return IOS_THROWN;

    }

    return NET_GetPortFromSockaddr(&sa);

}

JNIEXPORT jobject JNICALL

Java_sun_nio_ch_Net_remoteInetAddress(JNIEnv *env, jclass clazz, jobject fdo)

{

    SOCKETADDRESS sa;

    int sa_len = sizeof(sa);

    int port;

    if (getpeername(fdval(env, fdo), &sa.sa, &sa_len) < 0) {

        NET_ThrowNew(env, WSAGetLastError(), "getsockname");

        return NULL;

    }

    return NET_SockaddrToInetAddress(env, &sa, &port);

}

JNIEXPORT jint JNICALL

Java_sun_nio_ch_Net_getIntOption0(JNIEnv *env, jclass clazz, jobject fdo,

                                  jboolean mayNeedConversion, jint level, jint opt)

{

    int result = 0;

    struct linger linger;

    char *arg;

    int arglen, n;

    if (level == SOL_SOCKET && opt == SO_LINGER) {

        arg = (char *)&linger;

        arglen = sizeof(linger);

    } else {

        arg = (char *)&result;

        arglen = sizeof(result);

    }

    /**

     * HACK: IP_TOS is deprecated on Windows and querying the option

     * returns a protocol error. NET_GetSockOpt handles this and uses

     * a fallback mechanism. Same applies to IPV6_TCLASS

     */

    if ((level == IPPROTO_IP && opt == IP_TOS) || (level == IPPROTO_IPV6 && opt == IPV6_TCLASS)) {

        mayNeedConversion = JNI_TRUE;

    }

    if (mayNeedConversion) {

        n = NET_GetSockOpt(fdval(env, fdo), level, opt, arg, &arglen);

    } else {

        n = getsockopt(fdval(env, fdo), level, opt, arg, &arglen);

    }

    if (n < 0) {

        handleSocketError(env, WSAGetLastError());

        return IOS_THROWN;

    }

    if (level == SOL_SOCKET && opt == SO_LINGER)

        return linger.l_onoff ? linger.l_linger : -1;

    else

        return result;

}

JNIEXPORT void JNICALL

Java_sun_nio_ch_Net_setIntOption0(JNIEnv *env, jclass clazz, jobject fdo,

                                  jboolean mayNeedConversion, jint level, jint opt, jint arg, jboolean ipv6)

{

    struct linger linger;

    char *parg;

    int arglen, n;

    if (level == SOL_SOCKET && opt == SO_LINGER) {

        parg = (char *)&linger;

        arglen = sizeof(linger);

        if (arg >= 0) {

            linger.l_onoff = 1;

            linger.l_linger = (unsigned short)arg;

        } else {

            linger.l_onoff = 0;

            linger.l_linger = 0;

        }

    } else {

        parg = (char *)&arg;

        arglen = sizeof(arg);

    }

    if (level == IPPROTO_IPV6 && opt == IPV6_TCLASS) {

        /* No op */

        return;

    }

    if (mayNeedConversion) {

        n = NET_SetSockOpt(fdval(env, fdo), level, opt, parg, arglen);

    } else {

        n = setsockopt(fdval(env, fdo), level, opt, parg, arglen);

    }

    if (n < 0)

        handleSocketError(env, WSAGetLastError());

}

JNIEXPORT jint JNICALL

Java_sun_nio_ch_Net_joinOrDrop4(JNIEnv *env, jobject this, jboolean join, jobject fdo,

                                jint group, jint interf, jint source)

{

    struct ip_mreq mreq;

    struct my_ip_mreq_source mreq_source;

    int opt, n, optlen;

    void* optval;

    if (source == 0) {

        mreq.imr_multiaddr.s_addr = htonl(group);

        mreq.imr_interface.s_addr = htonl(interf);

        opt = (join) ? IP_ADD_MEMBERSHIP : IP_DROP_MEMBERSHIP;

        optval = (void*)&mreq;

        optlen = sizeof(mreq);

    } else {

        mreq_source.imr_multiaddr.s_addr = htonl(group);

        mreq_source.imr_sourceaddr.s_addr = htonl(source);

        mreq_source.imr_interface.s_addr = htonl(interf);

        opt = (join) ? IP_ADD_SOURCE_MEMBERSHIP : IP_DROP_SOURCE_MEMBERSHIP;

        optval = (void*)&mreq_source;

        optlen = sizeof(mreq_source);

    }

    n = setsockopt(fdval(env,fdo), IPPROTO_IP, opt, optval, optlen);

    if (n < 0) {

        if (join && (WSAGetLastError() == WSAENOPROTOOPT))

            return IOS_UNAVAILABLE;

        handleSocketError(env, WSAGetLastError());

    }

    return 0;

}

JNIEXPORT jint JNICALL

Java_sun_nio_ch_Net_blockOrUnblock4(JNIEnv *env, jobject this, jboolean block, jobject fdo,

                                   jint group, jint interf, jint source)

{

    struct my_ip_mreq_source mreq_source;

    int n;

    int opt = (block) ? IP_BLOCK_SOURCE : IP_UNBLOCK_SOURCE;

    mreq_source.imr_multiaddr.s_addr = htonl(group);

    mreq_source.imr_sourceaddr.s_addr = htonl(source);

    mreq_source.imr_interface.s_addr = htonl(interf);

    n = setsockopt(fdval(env,fdo), IPPROTO_IP, opt,

                   (void*)&mreq_source, sizeof(mreq_source));

    if (n < 0) {

        if (block && (WSAGetLastError() == WSAENOPROTOOPT))

            return IOS_UNAVAILABLE;

        handleSocketError(env, WSAGetLastError());

    }

    return 0;

}

/**

 * Call setsockopt with a IPPROTO_IPV6 level socket option

 * and a group_source_req structure as the option value. The

 * given IPv6 group, interface index, and IPv6 source address

 * are copied into the structure.

 */

static int setGroupSourceReqOption(JNIEnv* env,

                                   jobject fdo,

                                   int opt,

                                   jbyteArray group,

                                   jint index,

                                   jbyteArray source)

{

    struct my_group_source_req req;

    struct sockaddr_in6* sin6;

    req.gsr_interface = (ULONG)index;

    sin6 = (struct sockaddr_in6*)&(req.gsr_group);

    sin6->sin6_family = AF_INET6;

    COPY_INET6_ADDRESS(env, group, (jbyte*)&(sin6->sin6_addr));

    sin6 = (struct sockaddr_in6*)&(req.gsr_source);

    sin6->sin6_family = AF_INET6;

    COPY_INET6_ADDRESS(env, source, (jbyte*)&(sin6->sin6_addr));