/*

 * Copyright (c) 2009, 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 <sys/types.h>

#include <sys/socket.h>

#include <errno.h>

#if defined(__solaris__)

  #if !defined(PROTO_SDP)

    #define PROTO_SDP       257

  #endif

#elif defined(__linux__)

  #if !defined(AF_INET_SDP)

    #define AF_INET_SDP     27

  #endif

#endif

#include "jni.h"

#include "jni_util.h"

#include "net_util.h"

#define RESTARTABLE(_cmd, _result) do { \

  do { \

    _result = _cmd; \

  } while((_result == -1) && (errno == EINTR)); \

} while(0)

/**

 * Creates a SDP socket.

 */

static int create(JNIEnv* env)

{

    int s;

#if defined(__solaris__)

    int domain = ipv6_available() ? AF_INET6 : AF_INET;

    s = socket(domain, SOCK_STREAM, PROTO_SDP);

#elif defined(__linux__)

    /**

     * IPv6 not supported by SDP on Linux

     */

    if (ipv6_available()) {

        JNU_ThrowIOException(env, "IPv6 not supported");

        return -1;

    }

    s = socket(AF_INET_SDP, SOCK_STREAM, 0);

#else

    /* not supported on other platforms at this time */

    s = -1;

    errno = EPROTONOSUPPORT;

#endif

    if (s < 0)

        JNU_ThrowIOExceptionWithLastError(env, "socket");

    return s;

}

/**

 * Creates a SDP socket, returning file descriptor referencing the socket.

 */

JNIEXPORT jint JNICALL

Java_sun_net_sdp_SdpSupport_create0(JNIEnv *env, jclass cls)

{

    return create(env);

}

/**

 * Converts an existing file descriptor, that references an unbound TCP socket,

 * to SDP.

 */

JNIEXPORT void JNICALL

Java_sun_net_sdp_SdpSupport_convert0(JNIEnv *env, jclass cls, int fd)

{

    int s = create(env);

    if (s >= 0) {

        socklen_t len;

        int arg, res;

        struct linger linger;

        /* copy socket options that are relevant to SDP */

        len = sizeof(arg);

        if (getsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char*)&arg, &len) == 0)

            setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char*)&arg, len);

#ifdef SO_REUSEPORT

        len = sizeof(arg);

        if (getsockopt(fd, SOL_SOCKET, SO_REUSEPORT, (char*)&arg, &len) == 0)

            setsockopt(s, SOL_SOCKET, SO_REUSEPORT, (char*)&arg, len);

#endif

        len = sizeof(arg);

        if (getsockopt(fd, SOL_SOCKET, SO_OOBINLINE, (char*)&arg, &len) == 0)

            setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (char*)&arg, len);

        len = sizeof(linger);

        if (getsockopt(fd, SOL_SOCKET, SO_LINGER, (void*)&linger, &len) == 0)

            setsockopt(s, SOL_SOCKET, SO_LINGER, (char*)&linger, len);

        RESTARTABLE(dup2(s, fd), res);

        if (res < 0)

            JNU_ThrowIOExceptionWithLastError(env, "dup2");

        res = close(s);

        if (res < 0 && !(*env)->ExceptionOccurred(env))

            JNU_ThrowIOExceptionWithLastError(env, "close");

    }

}