/*

 * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the OpenSSL license (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

#include <stdio.h>

#include <errno.h>

#include "bio_local.h"

#include "internal/cryptlib.h"

#ifndef OPENSSL_NO_SOCK

# include <openssl/bio.h>

# ifdef WATT32

/* Watt-32 uses same names */

#  undef sock_write

#  undef sock_read

#  undef sock_puts

#  define sock_write SockWrite

#  define sock_read  SockRead

#  define sock_puts  SockPuts

# endif

static int sock_write(BIO *h, const char *buf, int num);

static int sock_read(BIO *h, char *buf, int size);

static int sock_puts(BIO *h, const char *str);

static long sock_ctrl(BIO *h, int cmd, long arg1, void *arg2);

static int sock_new(BIO *h);

static int sock_free(BIO *data);

int BIO_sock_should_retry(int s);

static const BIO_METHOD methods_sockp = {

    BIO_TYPE_SOCKET,

    "socket",

    /* TODO: Convert to new style write function */

    bwrite_conv,

    sock_write,

    /* TODO: Convert to new style read function */

    bread_conv,

    sock_read,

    sock_puts,

    NULL,                       /* sock_gets,         */

    sock_ctrl,

    sock_new,

    sock_free,

    NULL,                       /* sock_callback_ctrl */

};

const BIO_METHOD *BIO_s_socket(void)

{

    return &methods_sockp;

}

BIO *BIO_new_socket(int fd, int close_flag)

{

    BIO *ret;

    ret = BIO_new(BIO_s_socket());

    if (ret == NULL)

        return NULL;

    BIO_set_fd(ret, fd, close_flag);

    return ret;

}

static int sock_new(BIO *bi)

{

    bi->init = 0;

    bi->num = 0;

    bi->ptr = NULL;

    bi->flags = 0;

    return 1;

}

static int sock_free(BIO *a)

{

    if (a == NULL)

        return 0;

    if (a->shutdown) {

        if (a->init) {

            BIO_closesocket(a->num);

        }

        a->init = 0;

        a->flags = 0;

    }

    return 1;

}

static int sock_read(BIO *b, char *out, int outl)

{

    int ret = 0;

    if (out != NULL) {

        clear_socket_error();

        ret = readsocket(b->num, out, outl);

        BIO_clear_retry_flags(b);

        if (ret <= 0) {

            if (BIO_sock_should_retry(ret))

                BIO_set_retry_read(b);

            else if (ret == 0)

                b->flags |= BIO_FLAGS_IN_EOF;

        }

    }

    return ret;

}

static int sock_write(BIO *b, const char *in, int inl)

{

    int ret;

    clear_socket_error();

    ret = writesocket(b->num, in, inl);

    BIO_clear_retry_flags(b);

    if (ret <= 0) {

        if (BIO_sock_should_retry(ret))

            BIO_set_retry_write(b);

    }

    return ret;

}

static long sock_ctrl(BIO *b, int cmd, long num, void *ptr)

{

    long ret = 1;

    int *ip;

    switch (cmd) {

    case BIO_C_SET_FD:

        sock_free(b);

        b->num = *((int *)ptr);

        b->shutdown = (int)num;

        b->init = 1;

        break;

    case BIO_C_GET_FD:

        if (b->init) {

            ip = (int *)ptr;

            if (ip != NULL)

                *ip = b->num;

            ret = b->num;

        } else

            ret = -1;

        break;

    case BIO_CTRL_GET_CLOSE:

        ret = b->shutdown;

        break;

    case BIO_CTRL_SET_CLOSE:

        b->shutdown = (int)num;

        break;

    case BIO_CTRL_DUP:

    case BIO_CTRL_FLUSH:

        ret = 1;

        break;

    case BIO_CTRL_EOF:

        ret = (b->flags & BIO_FLAGS_IN_EOF) != 0 ? 1 : 0;

        break;

    default:

        ret = 0;

        break;

    }

    return ret;

}

static int sock_puts(BIO *bp, const char *str)

{

    int n, ret;

    n = strlen(str);

    ret = sock_write(bp, str, n);

    return ret;

}

int BIO_sock_should_retry(int i)

{

    int err;

    if ((i == 0) || (i == -1)) {

        err = get_last_socket_error();

        return BIO_sock_non_fatal_error(err);

    }

    return 0;

}

int BIO_sock_non_fatal_error(int err)

{

    switch (err) {

# if defined(OPENSSL_SYS_WINDOWS)

#  if defined(WSAEWOULDBLOCK)

    case WSAEWOULDBLOCK:

#  endif

# endif

# ifdef EWOULDBLOCK

#  ifdef WSAEWOULDBLOCK

#   if WSAEWOULDBLOCK != EWOULDBLOCK

    case EWOULDBLOCK:

#   endif

#  else

    case EWOULDBLOCK:

#  endif

# endif

# if defined(ENOTCONN)

    case ENOTCONN:

# endif

# ifdef EINTR

    case EINTR:

# endif

# ifdef EAGAIN

#  if EWOULDBLOCK != EAGAIN

    case EAGAIN:

#  endif

# endif

# ifdef EPROTO

    case EPROTO:

# endif

# ifdef EINPROGRESS

    case EINPROGRESS:

# endif

# ifdef EALREADY

    case EALREADY:

# endif

        return 1;

    default:

        break;

    }

    return 0;

}

#endif                          /* #ifndef OPENSSL_NO_SOCK */