/*

 * Copyright (c) 2007, 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_DualStackPlainSocketImpl.h"

#define SET_BLOCKING 0

#define SET_NONBLOCKING 1

static jclass isa_class;        /* java.net.InetSocketAddress */

static jmethodID isa_ctorID;    /* InetSocketAddress(InetAddress, int) */

/*

 * Class:     java_net_DualStackPlainSocketImpl

 * Method:    initIDs

 * Signature: ()V

 */

JNIEXPORT void JNICALL Java_java_net_DualStackPlainSocketImpl_initIDs

  (JNIEnv *env, jclass clazz) {

    jclass cls = (*env)->FindClass(env, "java/net/InetSocketAddress");

    CHECK_NULL(cls);

    isa_class = (*env)->NewGlobalRef(env, cls);

    CHECK_NULL(isa_class);

    isa_ctorID = (*env)->GetMethodID(env, cls, "<init>",

                                     "(Ljava/net/InetAddress;I)V");

    CHECK_NULL(isa_ctorID);

    initInetAddressIDs(env);

    // implement read timeout with select.

    isRcvTimeoutSupported = 0;

}

/*

 * Class:     java_net_DualStackPlainSocketImpl

 * Method:    socket0

 * Signature: (ZZ)I

 */

JNIEXPORT jint JNICALL Java_java_net_DualStackPlainSocketImpl_socket0

  (JNIEnv *env, jclass clazz, jboolean stream, jboolean v6Only /*unused*/) {

    int fd, rv, opt=0;

    fd = NET_Socket(AF_INET6, (stream ? SOCK_STREAM : SOCK_DGRAM), 0);

    if (fd == INVALID_SOCKET) {

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

        return -1;

    }

    rv = setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, (char *) &opt, sizeof(opt));

    if (rv == SOCKET_ERROR) {

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

    }

    SetHandleInformation((HANDLE)(UINT_PTR)fd, HANDLE_FLAG_INHERIT, FALSE);

    return fd;

}

/*

 * Class:     java_net_DualStackPlainSocketImpl

 * Method:    bind0

 * Signature: (ILjava/net/InetAddress;I)V

 */

JNIEXPORT void JNICALL Java_java_net_DualStackPlainSocketImpl_bind0

  (JNIEnv *env, jclass clazz, jint fd, jobject iaObj, jint port,

   jboolean exclBind)

{

    SOCKETADDRESS sa;

    int rv;

    int sa_len = sizeof(sa);

    if (NET_InetAddressToSockaddr(env, iaObj, port, (struct sockaddr *)&sa,

                                 &sa_len, JNI_TRUE) != 0) {

      return;

    }

    rv = NET_WinBind(fd, (struct sockaddr *)&sa, sa_len, exclBind);

    if (rv == SOCKET_ERROR)

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

}

/*

 * Class:     java_net_DualStackPlainSocketImpl

 * Method:    connect0

 * Signature: (ILjava/net/InetAddress;I)I

 */

JNIEXPORT jint JNICALL Java_java_net_DualStackPlainSocketImpl_connect0

  (JNIEnv *env, jclass clazz, jint fd, jobject iaObj, jint port) {

    SOCKETADDRESS sa;

    int rv;

    int sa_len = sizeof(sa);

    if (NET_InetAddressToSockaddr(env, iaObj, port, (struct sockaddr *)&sa,

                                 &sa_len, JNI_TRUE) != 0) {

      return -1;

    }

    rv = connect(fd, (struct sockaddr *)&sa, sa_len);

    if (rv == SOCKET_ERROR) {

        int err = WSAGetLastError();

        if (err == WSAEWOULDBLOCK) {

            return java_net_DualStackPlainSocketImpl_WOULDBLOCK;

        } else if (err == WSAEADDRNOTAVAIL) {

            JNU_ThrowByName(env, JNU_JAVANETPKG "ConnectException",

                "connect: Address is invalid on local machine, or port is not valid on remote machine");

        } else {

            NET_ThrowNew(env, err, "connect");

        }

        return -1;  // return value not important.

    }

    return rv;

}

/*

 * Class:     java_net_DualStackPlainSocketImpl

 * Method:    waitForConnect

 * Signature: (II)V

 */

JNIEXPORT void JNICALL Java_java_net_DualStackPlainSocketImpl_waitForConnect

  (JNIEnv *env, jclass clazz, jint fd, jint timeout) {

    int rv, retry;

    int optlen = sizeof(rv);

    fd_set wr, ex;

    struct timeval t;

    FD_ZERO(&wr);

    FD_ZERO(&ex);

    FD_SET(fd, &wr);

    FD_SET(fd, &ex);

    t.tv_sec = timeout / 1000;

    t.tv_usec = (timeout % 1000) * 1000;

    /*

     * Wait for timeout, connection established or

     * connection failed.

     */

    rv = select(fd+1, 0, &wr, &ex, &t);

    /*

     * Timeout before connection is established/failed so

     * we throw exception and shutdown input/output to prevent

     * socket from being used.

     * The socket should be closed immediately by the caller.

     */

    if (rv == 0) {

        JNU_ThrowByName(env, JNU_JAVANETPKG "SocketTimeoutException",

                        "connect timed out");

        shutdown( fd, SD_BOTH );

        return;

    }

    /*

     * Socket is writable or error occurred. On some Windows editions

     * the socket will appear writable when the connect fails so we

     * check for error rather than writable.

     */

    if (!FD_ISSET(fd, &ex)) {

        return;         /* connection established */

    }

    /*

     * Connection failed. The logic here is designed to work around

     * bug on Windows NT whereby using getsockopt to obtain the

     * last error (SO_ERROR) indicates there is no error. The workaround

     * on NT is to allow winsock to be scheduled and this is done by

     * yielding and retrying. As yielding is problematic in heavy

     * load conditions we attempt up to 3 times to get the error reason.

     */

    for (retry=0; retry<3; retry++) {

        NET_GetSockOpt(fd, SOL_SOCKET, SO_ERROR,

                       (char*)&rv, &optlen);

        if (rv) {

            break;

        }

        Sleep(0);

    }

    if (rv == 0) {

        JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException",

                        "Unable to establish connection");

    } else {

        NET_ThrowNew(env, rv, "connect");

    }

}

/*

 * Class:     java_net_DualStackPlainSocketImpl

 * Method:    localPort0

 * Signature: (I)I

 */

JNIEXPORT jint JNICALL Java_java_net_DualStackPlainSocketImpl_localPort0

  (JNIEnv *env, jclass clazz, jint fd) {

    SOCKETADDRESS sa;

    int len = sizeof(sa);

    if (getsockname(fd, (struct sockaddr *)&sa, &len) == SOCKET_ERROR) {

        if (WSAGetLastError() == WSAENOTSOCK) {

            JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException",

                    "Socket closed");

        } else {

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

        }

        return -1;

    }

    return (int) ntohs((u_short)GET_PORT(&sa));

}

/*

 * Class:     java_net_DualStackPlainSocketImpl

 * Method:    localAddress

 * Signature: (ILjava/net/InetAddressContainer;)V

 */

JNIEXPORT void JNICALL Java_java_net_DualStackPlainSocketImpl_localAddress

  (JNIEnv *env, jclass clazz, jint fd, jobject iaContainerObj) {

    int port;

    SOCKETADDRESS sa;

    int len = sizeof(sa);

    jobject iaObj;

    jclass iaContainerClass;

    jfieldID iaFieldID;

    if (getsockname(fd, (struct sockaddr *)&sa, &len) == SOCKET_ERROR) {

        NET_ThrowNew(env, WSAGetLastError(), "Error getting socket name");

        return;

    }

    iaObj = NET_SockaddrToInetAddress(env, (struct sockaddr *)&sa, &port);

    CHECK_NULL(iaObj);

    iaContainerClass = (*env)->GetObjectClass(env, iaContainerObj);

    iaFieldID = (*env)->GetFieldID(env, iaContainerClass, "addr", "Ljava/net/InetAddress;");

    CHECK_NULL(iaFieldID);

    (*env)->SetObjectField(env, iaContainerObj, iaFieldID, iaObj);

}

/*

 * Class:     java_net_DualStackPlainSocketImpl

 * Method:    listen0

 * Signature: (II)V

 */

JNIEXPORT void JNICALL Java_java_net_DualStackPlainSocketImpl_listen0

  (JNIEnv *env, jclass clazz, jint fd, jint backlog) {

    if (listen(fd, backlog) == SOCKET_ERROR) {

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

    }

}

/*

 * Class:     java_net_DualStackPlainSocketImpl

 * Method:    accept0

 * Signature: (I[Ljava/net/InetSocketAddress;)I

 */

JNIEXPORT jint JNICALL Java_java_net_DualStackPlainSocketImpl_accept0

  (JNIEnv *env, jclass clazz, jint fd, jobjectArray isaa) {

    int newfd, port=0;

    jobject isa;

    jobject ia;

    SOCKETADDRESS sa;

    int len = sizeof(sa);

    memset((char *)&sa, 0, len);

    newfd = accept(fd, (struct sockaddr *)&sa, &len);

    if (newfd == INVALID_SOCKET) {

        if (WSAGetLastError() == -2) {

            JNU_ThrowByName(env, JNU_JAVAIOPKG "InterruptedIOException",

                            "operation interrupted");

        } else {

            JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException",

                            "socket closed");

        }

        return -1;

    }

    SetHandleInformation((HANDLE)(UINT_PTR)newfd, HANDLE_FLAG_INHERIT, 0);

    ia = NET_SockaddrToInetAddress(env, (struct sockaddr *)&sa, &port);

    isa = (*env)->NewObject(env, isa_class, isa_ctorID, ia, port);

    (*env)->SetObjectArrayElement(env, isaa, 0, isa);

    return newfd;

}

/*

 * Class:     java_net_DualStackPlainSocketImpl

 * Method:    waitForNewConnection

 * Signature: (II)V

 */

JNIEXPORT void JNICALL Java_java_net_DualStackPlainSocketImpl_waitForNewConnection

  (JNIEnv *env, jclass clazz, jint fd, jint timeout) {

    int rv;

    rv = NET_Timeout(fd, timeout);

    if (rv == 0) {

        JNU_ThrowByName(env, JNU_JAVANETPKG "SocketTimeoutException",

                        "Accept timed out");

    } else if (rv == -1) {

        JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException", "socket closed");

    } else if (rv == -2) {

        JNU_ThrowByName(env, JNU_JAVAIOPKG "InterruptedIOException",

                        "operation interrupted");

    }

}

/*

 * Class:     java_net_DualStackPlainSocketImpl

 * Method:    available0

 * Signature: (I)I

 */

JNIEXPORT jint JNICALL Java_java_net_DualStackPlainSocketImpl_available0

  (JNIEnv *env, jclass clazz, jint fd) {

    jint available = -1;

    if ((ioctlsocket(fd, FIONREAD, &available)) == SOCKET_ERROR) {

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

    }

    return available;

}

/*

 * Class:     java_net_DualStackPlainSocketImpl

 * Method:    close0

 * Signature: (I)V

 */

JNIEXPORT void JNICALL Java_java_net_DualStackPlainSocketImpl_close0

  (JNIEnv *env, jclass clazz, jint fd) {

     NET_SocketClose(fd);

}

/*

 * Class:     java_net_DualStackPlainSocketImpl

 * Method:    shutdown0

 * Signature: (II)V

 */

JNIEXPORT void JNICALL Java_java_net_DualStackPlainSocketImpl_shutdown0

  (JNIEnv *env, jclass clazz, jint fd, jint howto) {

    shutdown(fd, howto);

}

/*

 * Class:     java_net_DualStackPlainSocketImpl

 * Method:    setIntOption

 * Signature: (III)V

 */

JNIEXPORT void JNICALL

Java_java_net_DualStackPlainSocketImpl_setIntOption

  (JNIEnv *env, jclass clazz, jint fd, jint cmd, jint value)

{

    int level = 0, opt = 0;

    struct linger linger = {0, 0};

    char *parg;

    int arglen;

    if (NET_MapSocketOption(cmd, &level, &opt) < 0) {

        JNU_ThrowByName(env, "java/net/SocketException", "Invalid option");

        return;

    }

    if (opt == java_net_SocketOptions_SO_LINGER) {

        parg = (char *)&linger;

        arglen = sizeof(linger);

        if (value >= 0) {

            linger.l_onoff = 1;

            linger.l_linger = (unsigned short)value;

        } else {

            linger.l_onoff = 0;

            linger.l_linger = 0;

        }

    } else {

        parg = (char *)&value;

        arglen = sizeof(value);

    }

    if (NET_SetSockOpt(fd, level, opt, parg, arglen) < 0) {

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

    }

}

/*

 * Class:     java_net_DualStackPlainSocketImpl

 * Method:    getIntOption

 * Signature: (II)I

 */

JNIEXPORT jint JNICALL Java_java_net_DualStackPlainSocketImpl_getIntOption

  (JNIEnv *env, jclass clazz, jint fd, jint cmd)

{

    int level = 0, opt = 0;

    int result=0;

    struct linger linger = {0, 0};

    char *arg;

    int arglen;

    if (NET_MapSocketOption(cmd, &level, &opt) < 0) {

        JNU_ThrowByName(env, "java/net/SocketException", "Invalid option");

        return -1;

    }

    if (opt == java_net_SocketOptions_SO_LINGER) {

        arg = (char *)&linger;

        arglen = sizeof(linger);

    } else {

        arg = (char *)&result;

        arglen = sizeof(result);

    }

    if (NET_GetSockOpt(fd, level, opt, arg, &arglen) < 0) {

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

        return -1;

    }

    if (opt == java_net_SocketOptions_SO_LINGER)

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

    else

        return result;

}

/*

 * Class:     java_net_DualStackPlainSocketImpl

 * Method:    sendOOB

 * Signature: (II)V

 */

JNIEXPORT void JNICALL Java_java_net_DualStackPlainSocketImpl_sendOOB

  (JNIEnv *env, jclass clazz, jint fd, jint data) {

    jint n;

    unsigned char d = (unsigned char) data & 0xff;

    n = send(fd, (char *)&data, 1, MSG_OOB);

    if (n == SOCKET_ERROR) {

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

    }

}

/*

 * Class:     java_net_DualStackPlainSocketImpl

 * Method:    configureBlocking

 * Signature: (IZ)V

 */

JNIEXPORT void JNICALL Java_java_net_DualStackPlainSocketImpl_configureBlocking

  (JNIEnv *env, jclass clazz, jint fd, jboolean blocking) {

    u_long arg;

    int result;

    if (blocking == JNI_TRUE) {

        arg = SET_BLOCKING;    // 0

    } else {

        arg = SET_NONBLOCKING;   // 1

    }

    result = ioctlsocket(fd, FIONBIO, &arg);

    if (result == SOCKET_ERROR) {

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

    }

}