/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is the Netscape Portable Runtime (NSPR).
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998-2000
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

/* Win95 Sockets module
 *
 */

#include "primpl.h"

#define READ_FD     1
#define WRITE_FD    2
#define CONNECT_FD  3

static PRInt32 socket_io_wait(
    PROsfd osfd, 
    PRInt32 fd_type,
    PRIntervalTime timeout);


/* --- SOCKET IO --------------------------------------------------------- */

/*
 * we only want to call WSAIoctl() on Vista and later
 * so don't pay for it at build time (and avoid including winsock2.h)
 */

/* from ws2def.h */
#define IOC_IN                      0x80000000      /* copy in parameters */
#define IOC_VENDOR                  0x18000000
#define _WSAIOW(x,y)                (IOC_IN|(x)|(y))
/* from MSWSockDef.h */
#define SIO_SET_COMPATIBILITY_MODE  _WSAIOW(IOC_VENDOR,300)

typedef enum _WSA_COMPATIBILITY_BEHAVIOR_ID {
    WsaBehaviorAll = 0,
    WsaBehaviorReceiveBuffering,
    WsaBehaviorAutoTuning
} WSA_COMPATIBILITY_BEHAVIOR_ID, *PWSA_COMPATIBILITY_BEHAVIOR_ID;

/* from sdkddkver.h */
#define NTDDI_WIN6              0x06000000  /* Windows Vista */

/* from winsock2.h */
#define WSAEVENT                HANDLE

#define WSAOVERLAPPED           OVERLAPPED
typedef struct _OVERLAPPED *    LPWSAOVERLAPPED;

typedef void (CALLBACK * LPWSAOVERLAPPED_COMPLETION_ROUTINE)(
    IN DWORD dwError,
    IN DWORD cbTransferred,
    IN LPWSAOVERLAPPED lpOverlapped,
    IN DWORD dwFlags
);

typedef int (__stdcall * WSAIOCTLPROC) (
    SOCKET s,
    DWORD dwIoControlCode,
    LPVOID lpvInBuffer,
    DWORD cbInBuffer,
    LPVOID lpvOutBuffer,
    DWORD cbOutBuffer,
    LPDWORD lpcbBytesReturned,
    LPWSAOVERLAPPED lpOverlapped,
    LPWSAOVERLAPPED_COMPLETION_ROUTINE lpCompletionRoutine
);

typedef struct _WSA_COMPATIBILITY_MODE {
    WSA_COMPATIBILITY_BEHAVIOR_ID BehaviorId;
    ULONG TargetOsVersion;
} WSA_COMPATIBILITY_MODE, *PWSA_COMPATIBILITY_MODE;

static HMODULE libWinsock2 = NULL;
static WSAIOCTLPROC wsaioctlProc = NULL;
static PRBool socketSetCompatMode = PR_FALSE;

void _PR_MD_InitSockets(void)
{
    OSVERSIONINFO osvi;

    memset(&osvi, 0, sizeof(osvi));
    osvi.dwOSVersionInfoSize = sizeof(osvi);
    GetVersionEx(&osvi);

    /* if Vista or later... */
    if (osvi.dwMajorVersion >= 6)
    {
        libWinsock2 = LoadLibraryW(L"Ws2_32.dll");
        if (libWinsock2)
        {
            wsaioctlProc = (WSAIOCTLPROC)GetProcAddress(libWinsock2, 
                                                        "WSAIoctl");
            if (wsaioctlProc)
            {
                socketSetCompatMode = PR_TRUE;
            }
        }
    }
}

void _PR_MD_CleanupSockets(void)
{
    socketSetCompatMode = PR_FALSE;
    wsaioctlProc = NULL;
    if (libWinsock2)
    {
        FreeLibrary(libWinsock2);
        libWinsock2 = NULL;
    }
}

PROsfd
_PR_MD_SOCKET(int af, int type, int flags)
{
    SOCKET sock;
    u_long one = 1;

    sock = socket(af, type, flags);

    if (sock == INVALID_SOCKET ) 
    {
        _PR_MD_MAP_SOCKET_ERROR(WSAGetLastError());
        return (PROsfd)sock;
    }

    /*
    ** Make the socket Non-Blocking
    */
    if (ioctlsocket( sock, FIONBIO, &one) != 0)
    {
        PR_SetError(PR_UNKNOWN_ERROR, WSAGetLastError());
        closesocket(sock);
        return -1;
    }

    if ((af == AF_INET || af == AF_INET6) && 
        type == SOCK_STREAM && socketSetCompatMode)
    {
        WSA_COMPATIBILITY_MODE mode;
        char dummy[4];
        int ret_dummy;

        mode.BehaviorId = WsaBehaviorAutoTuning;
        mode.TargetOsVersion = NTDDI_WIN6;
        if (wsaioctlProc(sock, SIO_SET_COMPATIBILITY_MODE,  
                         (char *)&mode, sizeof(mode),
                         dummy, 4, &ret_dummy, 0, NULL) == SOCKET_ERROR)
        {
            int err = WSAGetLastError();
            PR_LOG(_pr_io_lm, PR_LOG_DEBUG, ("WSAIoctl() failed with %d", err));

            /* SIO_SET_COMPATIBILITY_MODE may not be supported.
            ** If the call to WSAIoctl() fails with WSAEOPNOTSUPP,
            ** don't close the socket.
            */ 
        }
    }

    return (PROsfd)sock;
}

/*
** _MD_CloseSocket() -- Close a socket
**
*/
PRInt32
_MD_CloseSocket(PROsfd osfd)
{
    PRInt32 rv;

    rv = closesocket((SOCKET) osfd );
    if (rv < 0)
        _PR_MD_MAP_CLOSE_ERROR(WSAGetLastError());

    return rv;
}

PRInt32
_MD_SocketAvailable(PRFileDesc *fd)
{
    PRInt32 result;

    if (ioctlsocket(fd->secret->md.osfd, FIONREAD, &result) < 0) {
        PR_SetError(PR_BAD_DESCRIPTOR_ERROR, WSAGetLastError());
        return -1;
    }
    return result;
}

PROsfd _MD_Accept(
    PRFileDesc *fd, 
    PRNetAddr *raddr, 
    PRUint32 *rlen,
    PRIntervalTime timeout )
{
    PROsfd osfd = fd->secret->md.osfd;
    SOCKET sock;
    PRInt32 rv, err;

    while ((sock = accept(osfd, (struct sockaddr *) raddr, rlen)) == -1) 
    {
        err = WSAGetLastError();
        if ((err == WSAEWOULDBLOCK) && (!fd->secret->nonblocking))
        {
            if ((rv = socket_io_wait(osfd, READ_FD, timeout)) < 0)
            {
                break;
            }
        }
        else
        {
            _PR_MD_MAP_ACCEPT_ERROR(err);
            break;
        }
    }
    return(sock);
} /* end _MD_accept() */

PRInt32
_PR_MD_CONNECT(PRFileDesc *fd, const PRNetAddr *addr, PRUint32 addrlen, 
               PRIntervalTime timeout)
{
    PROsfd osfd = fd->secret->md.osfd;
    PRInt32 rv;
    int     err;

    if ((rv = connect(osfd, (struct sockaddr *) addr, addrlen)) == -1) 
    {
        err = WSAGetLastError();
        if ((!fd->secret->nonblocking) && (err == WSAEWOULDBLOCK))
        {
            rv = socket_io_wait(osfd, CONNECT_FD, timeout);
            if ( rv < 0 )
            {
                return(-1);
            }
            else
            {
                PR_ASSERT(rv > 0);
                /* it's connected */
                return(0);
            } 
        }
        _PR_MD_MAP_CONNECT_ERROR(err);
    }
    return rv;
}

PRInt32
_PR_MD_BIND(PRFileDesc *fd, const PRNetAddr *addr, PRUint32 addrlen)
{
    PRInt32 rv;

    rv = bind(fd->secret->md.osfd, (const struct sockaddr *)&(addr->inet), addrlen);

    if (rv == SOCKET_ERROR)  {
        _PR_MD_MAP_BIND_ERROR(WSAGetLastError());
        return -1;
    }

    return 0;
}

PRInt32
_PR_MD_LISTEN(PRFileDesc *fd, PRIntn backlog)
{
    PRInt32 rv;

    rv = listen(fd->secret->md.osfd, backlog);

    if (rv == SOCKET_ERROR)  {
        _PR_MD_MAP_DEFAULT_ERROR(WSAGetLastError());
        return -1;
    }

    return 0;
}

PRInt32
_PR_MD_RECV(PRFileDesc *fd, void *buf, PRInt32 amount, PRIntn flags, 
            PRIntervalTime timeout)
{
    PROsfd osfd = fd->secret->md.osfd;
    PRInt32 rv, err;
    int osflags;

    if (0 == flags) {
        osflags = 0;
    } else {
        PR_ASSERT(PR_MSG_PEEK == flags);
        osflags = MSG_PEEK;
    }
    while ((rv = recv( osfd, buf, amount, osflags)) == -1) 
    {
        if (((err = WSAGetLastError()) == WSAEWOULDBLOCK) 
            && (!fd->secret->nonblocking))
        {
            rv = socket_io_wait(osfd, READ_FD, timeout);
            if ( rv < 0 )
            {
                return -1;
            } 
        } 
        else 
        {
            _PR_MD_MAP_RECV_ERROR(err);
            break;
        }
    } /* end while() */
    return(rv);
}

PRInt32
_PR_MD_SEND(PRFileDesc *fd, const void *buf, PRInt32 amount, PRIntn flags,
            PRIntervalTime timeout)
{
    PROsfd osfd = fd->secret->md.osfd;
    PRInt32 rv, err;
    PRInt32 bytesSent = 0;

    while(bytesSent < amount ) 
    {
        while ((rv = send( osfd, buf, amount, 0 )) == -1) 
        {
            if (((err = WSAGetLastError()) == WSAEWOULDBLOCK) 
                && (!fd->secret->nonblocking))
            {
                rv = socket_io_wait(osfd, WRITE_FD, timeout);
                if ( rv < 0 )
                {
                    return -1;
                }
            } 
            else 
            {
                _PR_MD_MAP_SEND_ERROR(err);
                return -1;
            }
        }
        bytesSent += rv;
        if (fd->secret->nonblocking)
        {
            break;
        }
        if (bytesSent < amount) 
        {
            rv = socket_io_wait(osfd, WRITE_FD, timeout);
            if ( rv < 0 )
            {
                return -1;
            }
        }
    }
    return bytesSent;
}

PRInt32
_PR_MD_SENDTO(PRFileDesc *fd, const void *buf, PRInt32 amount, PRIntn flags,
              const PRNetAddr *addr, PRUint32 addrlen, PRIntervalTime timeout)
{
    PROsfd osfd = fd->secret->md.osfd;
    PRInt32 rv, err;
    PRInt32 bytesSent = 0;

    while(bytesSent < amount) 
    {
        while ((rv = sendto( osfd, buf, amount, 0, (struct sockaddr *) addr,
                addrlen)) == -1) 
        {
            if (((err = WSAGetLastError()) == WSAEWOULDBLOCK) 
                && (!fd->secret->nonblocking))
            {
                rv = socket_io_wait(osfd, WRITE_FD, timeout);
                if ( rv < 0 )
                {
                    return -1;
                }
            } 
            else 
            {
                _PR_MD_MAP_SENDTO_ERROR(err);
                return -1;
            }
        }
        bytesSent += rv;
        if (fd->secret->nonblocking)
        {
            break;
        }
        if (bytesSent < amount) 
        {
            rv = socket_io_wait(osfd, WRITE_FD, timeout);
            if (rv < 0) 
            {
                return -1;
            }
        }
    }
    return bytesSent;
}

PRInt32
_PR_MD_RECVFROM(PRFileDesc *fd, void *buf, PRInt32 amount, PRIntn flags,
                PRNetAddr *addr, PRUint32 *addrlen, PRIntervalTime timeout)
{
    PROsfd osfd = fd->secret->md.osfd;
    PRInt32 rv, err;

    while ((rv = recvfrom( osfd, buf, amount, 0, (struct sockaddr *) addr,
            addrlen)) == -1) 
    {
        if (((err = WSAGetLastError()) == WSAEWOULDBLOCK) 
            && (!fd->secret->nonblocking))
        {
            rv = socket_io_wait(osfd, READ_FD, timeout);
            if ( rv < 0)
            {
                return -1;
            } 
        } 
        else 
        {
            _PR_MD_MAP_RECVFROM_ERROR(err);
            break;
        }
    }
    return(rv);
}

PRInt32
_PR_MD_WRITEV(PRFileDesc *fd, const PRIOVec *iov, PRInt32 iov_size, PRIntervalTime timeout)
{
    int index;
    int sent = 0;
    int rv;

    for (index=0; index < iov_size; index++) 
    {
        rv = _PR_MD_SEND(fd, iov[index].iov_base, iov[index].iov_len, 0, timeout);
        if (rv > 0) 
            sent += rv;
        if ( rv != iov[index].iov_len ) 
        {
            if (rv < 0)
            {
                if (fd->secret->nonblocking
                    && (PR_GetError() == PR_WOULD_BLOCK_ERROR)
                    && (sent > 0))
                {
                    return sent;
                }
                else
                {
                    return -1;
                }
            }
            /* Only a nonblocking socket can have partial sends */
            PR_ASSERT(fd->secret->nonblocking);
            return sent;
        }
    }
    return sent;
}

PRInt32
_PR_MD_SHUTDOWN(PRFileDesc *fd, PRIntn how)
{
PRInt32 rv;

    rv = shutdown(fd->secret->md.osfd, how);
    if (rv < 0)
        _PR_MD_MAP_SHUTDOWN_ERROR(WSAGetLastError());
    return rv;
}

PRStatus
_PR_MD_GETSOCKNAME(PRFileDesc *fd, PRNetAddr *addr, PRUint32 *len)
{
    PRInt32 rv;

    rv = getsockname((SOCKET)fd->secret->md.osfd, (struct sockaddr *)addr, len);
    if (rv==0) {
        return PR_SUCCESS;
    } else {
        _PR_MD_MAP_GETSOCKNAME_ERROR(WSAGetLastError());
        return PR_FAILURE;
    }
}

PRStatus
_PR_MD_GETPEERNAME(PRFileDesc *fd, PRNetAddr *addr, PRUint32 *len)
{
    PRInt32 rv;

    rv = getpeername((SOCKET)fd->secret->md.osfd, (struct sockaddr *)addr, len);
    if (rv==0) {
        return PR_SUCCESS;
    } else {
        _PR_MD_MAP_GETPEERNAME_ERROR(WSAGetLastError());
        return PR_FAILURE;
    }
}

PRStatus
_PR_MD_GETSOCKOPT(PRFileDesc *fd, PRInt32 level, PRInt32 optname, char* optval, PRInt32* optlen)
{
    PRInt32 rv;

    rv = getsockopt((SOCKET)fd->secret->md.osfd, level, optname, optval, optlen);
    if (rv==0) {
        return PR_SUCCESS;
    } else {
        _PR_MD_MAP_GETSOCKOPT_ERROR(WSAGetLastError());
        return PR_FAILURE;
    }
}

PRStatus
_PR_MD_SETSOCKOPT(PRFileDesc *fd, PRInt32 level, PRInt32 optname, const char* optval, PRInt32 optlen)
{
    PRInt32 rv;

    rv = setsockopt((SOCKET)fd->secret->md.osfd, level, optname, optval, optlen);
    if (rv==0) {
        return PR_SUCCESS;
    } else {
        _PR_MD_MAP_SETSOCKOPT_ERROR(WSAGetLastError());
        return PR_FAILURE;
    }
}

void
_MD_MakeNonblock(PRFileDesc *f)
{
    return; /* do nothing */
}


/*
 * socket_io_wait --
 *
 * Wait for socket i/o, periodically checking for interrupt.
 *
 * This function returns 1 on success.  On failure, it returns
 * -1 and sets the error codes.  It never returns 0.
 */
#define _PR_INTERRUPT_CHECK_INTERVAL_SECS 5

static PRInt32 socket_io_wait(
    PROsfd osfd, 
    PRInt32 fd_type,
    PRIntervalTime timeout)
{
    PRInt32 rv = -1;
    struct timeval tv;
    PRThread *me = _PR_MD_CURRENT_THREAD();
    PRIntervalTime elapsed, remaining;
    PRBool wait_for_remaining;
    fd_set rd_wr, ex;
    int err, len;

    switch (timeout) {
        case PR_INTERVAL_NO_WAIT:
            PR_SetError(PR_IO_TIMEOUT_ERROR, 0);
            break;
        case PR_INTERVAL_NO_TIMEOUT:
            /*
             * This is a special case of the 'default' case below.
             * Please see the comments there.
             */
            tv.tv_sec = _PR_INTERRUPT_CHECK_INTERVAL_SECS;
            tv.tv_usec = 0;
            FD_ZERO(&rd_wr);
            FD_ZERO(&ex);
            do {
                FD_SET(osfd, &rd_wr);
                FD_SET(osfd, &ex);
                switch( fd_type )
                {
                    case READ_FD:
                        rv = _MD_SELECT(0, &rd_wr, NULL, NULL, &tv);
                        break;
                    case WRITE_FD:
                        rv = _MD_SELECT(0, NULL, &rd_wr, NULL, &tv);
                        break;
                    case CONNECT_FD:
                        rv = _MD_SELECT(0, NULL, &rd_wr, &ex, &tv);
                        break;
                    default:
                        PR_ASSERT(0);
                        break;
                } /* end switch() */
                if (rv == -1 )
                {
                    _PR_MD_MAP_SELECT_ERROR(WSAGetLastError());
                    break;
                }
                if ( rv > 0 && fd_type == CONNECT_FD )
                {
                    /*
                     * Call Sleep(0) to work around a Winsock timing bug.
                     */
                    Sleep(0);
                    if (FD_ISSET((SOCKET)osfd, &ex))
                    {
                        len = sizeof(err);
                        if (getsockopt(osfd, SOL_SOCKET, SO_ERROR,
                                (char *) &err, &len) == SOCKET_ERROR)
                        {  
                            _PR_MD_MAP_GETSOCKOPT_ERROR(WSAGetLastError());
                            return -1;
                        }
                        if (err != 0)
                            _PR_MD_MAP_CONNECT_ERROR(err);
                        else
                            PR_SetError(PR_UNKNOWN_ERROR, 0);
                        return -1;
                    }
                    if (FD_ISSET((SOCKET)osfd, &rd_wr))
                    {
                        /* it's connected */
                        return 1;
                    }
                    PR_ASSERT(0);
                }
                if (_PR_PENDING_INTERRUPT(me)) {
                    me->flags &= ~_PR_INTERRUPT;
                    PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
                    rv = -1;
                    break;
                }
            } while (rv == 0);
            break;
        default:
            remaining = timeout;
            FD_ZERO(&rd_wr);
            FD_ZERO(&ex);
            do {
                /*
                 * We block in _MD_SELECT for at most
                 * _PR_INTERRUPT_CHECK_INTERVAL_SECS seconds,
                 * so that there is an upper limit on the delay
                 * before the interrupt bit is checked.
                 */
                wait_for_remaining = PR_TRUE;
                tv.tv_sec = PR_IntervalToSeconds(remaining);
                if (tv.tv_sec > _PR_INTERRUPT_CHECK_INTERVAL_SECS) {
                    wait_for_remaining = PR_FALSE;
                    tv.tv_sec = _PR_INTERRUPT_CHECK_INTERVAL_SECS;
                    tv.tv_usec = 0;
                } else {
                    tv.tv_usec = PR_IntervalToMicroseconds(
                        remaining -
                        PR_SecondsToInterval(tv.tv_sec));
                }
                FD_SET(osfd, &rd_wr);
                FD_SET(osfd, &ex);
                switch( fd_type )
                {
                    case READ_FD:
                        rv = _MD_SELECT(0, &rd_wr, NULL, NULL, &tv);
                        break;
                    case WRITE_FD:
                        rv = _MD_SELECT(0, NULL, &rd_wr, NULL, &tv);
                        break;
                    case CONNECT_FD:
                        rv = _MD_SELECT(0, NULL, &rd_wr, &ex, &tv);
                        break;
                    default:
                        PR_ASSERT(0);
                        break;
                } /* end switch() */
                if (rv == -1)
                {
                    _PR_MD_MAP_SELECT_ERROR(WSAGetLastError());
                    break;
                }
                if ( rv > 0 && fd_type == CONNECT_FD )
                {
                    /*
                     * Call Sleep(0) to work around a Winsock timing bug.
                     */
                    Sleep(0);
                    if (FD_ISSET((SOCKET)osfd, &ex))
                    {
                        len = sizeof(err);
                        if (getsockopt(osfd, SOL_SOCKET, SO_ERROR,
                                (char *) &err, &len) == SOCKET_ERROR)
                        {  
                            _PR_MD_MAP_GETSOCKOPT_ERROR(WSAGetLastError());
                            return -1;
                        }
                        if (err != 0)
                            _PR_MD_MAP_CONNECT_ERROR(err);
                        else
                            PR_SetError(PR_UNKNOWN_ERROR, 0);
                        return -1;
                    }
                    if (FD_ISSET((SOCKET)osfd, &rd_wr))
                    {
                        /* it's connected */
                        return 1;
                    }
                    PR_ASSERT(0);
                }
                if (_PR_PENDING_INTERRUPT(me)) {
                    me->flags &= ~_PR_INTERRUPT;
                    PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
                    rv = -1;
                    break;
                }
                /*
                 * We loop again if _MD_SELECT timed out and the
                 * timeout deadline has not passed yet.
                 */
                if (rv == 0 )
                {
                    if (wait_for_remaining) {
                        elapsed = remaining;
                    } else {
                        elapsed = PR_SecondsToInterval(tv.tv_sec) 
                                    + PR_MicrosecondsToInterval(tv.tv_usec);
                    }
                    if (elapsed >= remaining) {
                        PR_SetError(PR_IO_TIMEOUT_ERROR, 0);
                        rv = -1;
                        break;
                    } else {
                        remaining = remaining - elapsed;
                    }
                }
            } while (rv == 0 );
            break;
    }
    return(rv);
} /* end socket_io_wait() */