/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)

 * All rights reserved.

 *

 * This package is an SSL implementation written

 * by Eric Young (eay@cryptsoft.com).

 * The implementation was written so as to conform with Netscapes SSL.

 *

 * This library is free for commercial and non-commercial use as long as

 * the following conditions are aheared to.  The following conditions

 * apply to all code found in this distribution, be it the RC4, RSA,

 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation

 * included with this distribution is covered by the same copyright terms

 * except that the holder is Tim Hudson (tjh@cryptsoft.com).

 *

 * Copyright remains Eric Young's, and as such any Copyright notices in

 * the code are not to be removed.

 * If this package is used in a product, Eric Young should be given attribution

 * as the author of the parts of the library used.

 * This can be in the form of a textual message at program startup or

 * in documentation (online or textual) provided with the package.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. All advertising materials mentioning features or use of this software

 *    must display the following acknowledgement:

 *    "This product includes cryptographic software written by

 *     Eric Young (eay@cryptsoft.com)"

 *    The word 'cryptographic' can be left out if the rouines from the library

 *    being used are not cryptographic related :-).

 * 4. If you include any Windows specific code (or a derivative thereof) from

 *    the apps directory (application code) you must include an acknowledgement:

 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"

 *

 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 *

 * The licence and distribution terms for any publically available version or

 * derivative of this code cannot be changed.  i.e. this code cannot simply be

 * copied and put under another distribution licence

 * [including the GNU Public Licence.] */

#include <openssl/bio.h>

#if !defined(OPENSSL_TRUSTY)

#include <errno.h>

#include <string.h>

#if !defined(OPENSSL_WINDOWS)

#include <unistd.h>

#else

#include <io.h>

OPENSSL_MSVC_PRAGMA(warning(push, 3))

#include <windows.h>

OPENSSL_MSVC_PRAGMA(warning(pop))

#endif

#include <openssl/err.h>

#include <openssl/mem.h>

#include "internal.h"

#include "../internal.h"

static int bio_fd_non_fatal_error(int err) {

  if (

#ifdef EWOULDBLOCK

    err == EWOULDBLOCK ||

#endif

#ifdef WSAEWOULDBLOCK

    err == WSAEWOULDBLOCK ||

#endif

#ifdef ENOTCONN

    err == ENOTCONN ||

#endif

#ifdef EINTR

    err == EINTR ||

#endif

#ifdef EAGAIN

    err == EAGAIN ||

#endif

#ifdef EPROTO

    err == EPROTO ||

#endif

#ifdef EINPROGRESS

    err == EINPROGRESS ||

#endif

#ifdef EALREADY

    err == EALREADY ||

#endif

    0) {

    return 1;

  }

  return 0;

}

#if defined(OPENSSL_WINDOWS)

  #define BORINGSSL_ERRNO (int)GetLastError()

  #define BORINGSSL_CLOSE _close

  #define BORINGSSL_LSEEK _lseek

  #define BORINGSSL_READ _read

  #define BORINGSSL_WRITE _write

#else

  #define BORINGSSL_ERRNO errno

  #define BORINGSSL_CLOSE close

  #define BORINGSSL_LSEEK lseek

  #define BORINGSSL_READ read

  #define BORINGSSL_WRITE write

#endif

int bio_fd_should_retry(int i) {

  if (i == -1) {

    return bio_fd_non_fatal_error(BORINGSSL_ERRNO);

  }

  return 0;

}

BIO *BIO_new_fd(int fd, int close_flag) {

  BIO *ret = BIO_new(BIO_s_fd());

  if (ret == NULL) {

    return NULL;

  }

  BIO_set_fd(ret, fd, close_flag);

  return ret;

}

static int fd_new(BIO *bio) {

  // num is used to store the file descriptor.

  bio->num = -1;

  return 1;

}

static int fd_free(BIO *bio) {

  if (bio->shutdown) {

    if (bio->init) {

      BORINGSSL_CLOSE(bio->num);

    }

    bio->init = 0;

  }

  return 1;

}

static int fd_read(BIO *b, char *out, int outl) {

  int ret = 0;

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

  BIO_clear_retry_flags(b);

  if (ret <= 0) {

    if (bio_fd_should_retry(ret)) {

      BIO_set_retry_read(b);

    }

  }

  return ret;

}

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

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

  BIO_clear_retry_flags(b);

  if (ret <= 0) {

    if (bio_fd_should_retry(ret)) {

      BIO_set_retry_write(b);

    }

  }

  return ret;

}

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

  long ret = 1;

  int *ip;

  switch (cmd) {

    case BIO_CTRL_RESET:

      num = 0;

      OPENSSL_FALLTHROUGH;

    case BIO_C_FILE_SEEK:

      ret = 0;

      if (b->init) {

        ret = (long)BORINGSSL_LSEEK(b->num, num, SEEK_SET);

      }

      break;

    case BIO_C_FILE_TELL:

    case BIO_CTRL_INFO:

      ret = 0;

      if (b->init) {

        ret = (long)BORINGSSL_LSEEK(b->num, 0, SEEK_CUR);

      }

      break;

    case BIO_C_SET_FD:

      fd_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;

        }

        return 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_PENDING:

    case BIO_CTRL_WPENDING:

      ret = 0;

      break;

    case BIO_CTRL_FLUSH:

      ret = 1;

      break;

    default:

      ret = 0;

      break;

  }

  return ret;

}

static int fd_gets(BIO *bp, char *buf, int size) {

  if (size <= 0) {

    return 0;

  }

  char *ptr = buf;

  char *end = buf + size - 1;

  while (ptr < end && fd_read(bp, ptr, 1) > 0) {

    char c = ptr[0];

    ptr++;

    if (c == '\n') {

      break;

    }

  }

  ptr[0] = '\0';

  // The output length is bounded by |size|.

  return (int)(ptr - buf);

}

static const BIO_METHOD methods_fdp = {

    BIO_TYPE_FD, "file descriptor", fd_write, fd_read, NULL /* puts */,

    fd_gets,     fd_ctrl,           fd_new,   fd_free, NULL /* callback_ctrl */,

};

const BIO_METHOD *BIO_s_fd(void) { return &methods_fdp; }

int BIO_set_fd(BIO *bio, int fd, int close_flag) {

  return (int)BIO_int_ctrl(bio, BIO_C_SET_FD, close_flag, fd);

}

int BIO_get_fd(BIO *bio, int *out_fd) {

  return (int)BIO_ctrl(bio, BIO_C_GET_FD, 0, (char *) out_fd);

}

#endif  // OPENSSL_TRUSTY