/src/boringssl/crypto/bio/bio.c

Source (jump to first uncovered line)
/* 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>

#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <string.h>

#include <openssl/asn1.h>
#include <openssl/err.h>
#include <openssl/mem.h>
#include <openssl/thread.h>

#include "../internal.h"


static CRYPTO_EX_DATA_CLASS g_ex_data_class =
    CRYPTO_EX_DATA_CLASS_INIT_WITH_APP_DATA;

BIO *BIO_new(const BIO_METHOD *method) {
  BIO *ret = OPENSSL_zalloc(sizeof(BIO));
  if (ret == NULL) {
    return NULL;
  }

  ret->method = method;
  ret->shutdown = 1;
  ret->references = 1;
  CRYPTO_new_ex_data(&ret->ex_data);

  if (method->create != NULL && !method->create(ret)) {
    OPENSSL_free(ret);
    return NULL;
  }

  return ret;
}

int BIO_free(BIO *bio) {
  BIO *next_bio;

  for (; bio != NULL; bio = next_bio) {
    if (!CRYPTO_refcount_dec_and_test_zero(&bio->references)) {
      return 0;
    }

    next_bio = BIO_pop(bio);

    if (bio->method != NULL && bio->method->destroy != NULL) {
      bio->method->destroy(bio);
    }

    CRYPTO_free_ex_data(&g_ex_data_class, bio, &bio->ex_data);
    OPENSSL_free(bio);
  }
  return 1;
}

int BIO_up_ref(BIO *bio) {
  CRYPTO_refcount_inc(&bio->references);
  return 1;
}

void BIO_vfree(BIO *bio) {
  BIO_free(bio);
}

void BIO_free_all(BIO *bio) {
  BIO_free(bio);
}

int BIO_read(BIO *bio, void *buf, int len) {
  if (bio == NULL || bio->method == NULL || bio->method->bread == NULL) {
    OPENSSL_PUT_ERROR(BIO, BIO_R_UNSUPPORTED_METHOD);
    return -2;
  }
  if (!bio->init) {
    OPENSSL_PUT_ERROR(BIO, BIO_R_UNINITIALIZED);
    return -2;
  }
  if (len <= 0) {
    return 0;
  }
  int ret = bio->method->bread(bio, buf, len);
  if (ret > 0) {
    bio->num_read += ret;
  }
  return ret;
}

int BIO_gets(BIO *bio, char *buf, int len) {
  if (bio == NULL || bio->method == NULL || bio->method->bgets == NULL) {
    OPENSSL_PUT_ERROR(BIO, BIO_R_UNSUPPORTED_METHOD);
    return -2;
  }
  if (!bio->init) {
    OPENSSL_PUT_ERROR(BIO, BIO_R_UNINITIALIZED);
    return -2;
  }
  if (len <= 0) {
    return 0;
  }
  int ret = bio->method->bgets(bio, buf, len);
  if (ret > 0) {
    bio->num_read += ret;
  }
  return ret;
}

int BIO_write(BIO *bio, const void *in, int inl) {
  if (bio == NULL || bio->method == NULL || bio->method->bwrite == NULL) {
    OPENSSL_PUT_ERROR(BIO, BIO_R_UNSUPPORTED_METHOD);
    return -2;
  }
  if (!bio->init) {
    OPENSSL_PUT_ERROR(BIO, BIO_R_UNINITIALIZED);
    return -2;
  }
  if (inl <= 0) {
    return 0;
  }
  int ret = bio->method->bwrite(bio, in, inl);
  if (ret > 0) {
    bio->num_write += ret;
  }
  return ret;
}

int BIO_write_all(BIO *bio, const void *data, size_t len) {
  const uint8_t *data_u8 = data;
  while (len > 0) {
    int ret = BIO_write(bio, data_u8, len > INT_MAX ? INT_MAX : (int)len);
    if (ret <= 0) {
      return 0;
    }
    data_u8 += ret;
    len -= ret;
  }
  return 1;
}

int BIO_puts(BIO *bio, const char *in) {
  size_t len = strlen(in);
  if (len > INT_MAX) {
    // |BIO_write| and the return value both assume the string fits in |int|.
    OPENSSL_PUT_ERROR(BIO, ERR_R_OVERFLOW);
    return -1;
  }
  return BIO_write(bio, in, (int)len);
}

int BIO_flush(BIO *bio) {
  return (int)BIO_ctrl(bio, BIO_CTRL_FLUSH, 0, NULL);
}

long BIO_ctrl(BIO *bio, int cmd, long larg, void *parg) {
  if (bio == NULL) {
    return 0;
  }

  if (bio->method == NULL || bio->method->ctrl == NULL) {
    OPENSSL_PUT_ERROR(BIO, BIO_R_UNSUPPORTED_METHOD);
    return -2;
  }

  return bio->method->ctrl(bio, cmd, larg, parg);
}

char *BIO_ptr_ctrl(BIO *b, int cmd, long larg) {
  char *p = NULL;

  if (BIO_ctrl(b, cmd, larg, (void *)&p) <= 0) {
    return NULL;
  }

  return p;
}

long BIO_int_ctrl(BIO *b, int cmd, long larg, int iarg) {
  int i = iarg;

  return BIO_ctrl(b, cmd, larg, (void *)&i);
}

int BIO_reset(BIO *bio) {
  return (int)BIO_ctrl(bio, BIO_CTRL_RESET, 0, NULL);
}

int BIO_eof(BIO *bio) {
  return (int)BIO_ctrl(bio, BIO_CTRL_EOF, 0, NULL);
}

void BIO_set_flags(BIO *bio, int flags) {
  bio->flags |= flags;
}

int BIO_test_flags(const BIO *bio, int flags) {
  return bio->flags & flags;
}

int BIO_should_read(const BIO *bio) {
  return BIO_test_flags(bio, BIO_FLAGS_READ);
}

int BIO_should_write(const BIO *bio) {
  return BIO_test_flags(bio, BIO_FLAGS_WRITE);
}

int BIO_should_retry(const BIO *bio) {
  return BIO_test_flags(bio, BIO_FLAGS_SHOULD_RETRY);
}

int BIO_should_io_special(const BIO *bio) {
  return BIO_test_flags(bio, BIO_FLAGS_IO_SPECIAL);
}

int BIO_get_retry_reason(const BIO *bio) { return bio->retry_reason; }

void BIO_set_retry_reason(BIO *bio, int reason) { bio->retry_reason = reason; }

void BIO_clear_flags(BIO *bio, int flags) {
  bio->flags &= ~flags;
}

void BIO_set_retry_read(BIO *bio) {
  bio->flags |= BIO_FLAGS_READ | BIO_FLAGS_SHOULD_RETRY;
}

void BIO_set_retry_write(BIO *bio) {
  bio->flags |= BIO_FLAGS_WRITE | BIO_FLAGS_SHOULD_RETRY;
}

static const int kRetryFlags = BIO_FLAGS_RWS | BIO_FLAGS_SHOULD_RETRY;

int BIO_get_retry_flags(BIO *bio) {
  return bio->flags & kRetryFlags;
}

void BIO_clear_retry_flags(BIO *bio) {
  bio->flags &= ~kRetryFlags;
  bio->retry_reason = 0;
}

int BIO_method_type(const BIO *bio) { return bio->method->type; }

void BIO_copy_next_retry(BIO *bio) {
  BIO_clear_retry_flags(bio);
  BIO_set_flags(bio, BIO_get_retry_flags(bio->next_bio));
  bio->retry_reason = bio->next_bio->retry_reason;
}

long BIO_callback_ctrl(BIO *bio, int cmd, bio_info_cb fp) {
  if (bio == NULL) {
    return 0;
  }

  if (bio->method == NULL || bio->method->callback_ctrl == NULL) {
    OPENSSL_PUT_ERROR(BIO, BIO_R_UNSUPPORTED_METHOD);
    return 0;
  }

  return bio->method->callback_ctrl(bio, cmd, fp);
}

size_t BIO_pending(const BIO *bio) {
  const long r = BIO_ctrl((BIO *) bio, BIO_CTRL_PENDING, 0, NULL);
  assert(r >= 0);

  if (r < 0) {
    return 0;
  }
  return r;
}

size_t BIO_ctrl_pending(const BIO *bio) {
  return BIO_pending(bio);
}

size_t BIO_wpending(const BIO *bio) {
  const long r = BIO_ctrl((BIO *) bio, BIO_CTRL_WPENDING, 0, NULL);
  assert(r >= 0);

  if (r < 0) {
    return 0;
  }
  return r;
}

int BIO_set_close(BIO *bio, int close_flag) {
  return (int)BIO_ctrl(bio, BIO_CTRL_SET_CLOSE, close_flag, NULL);
}

OPENSSL_EXPORT uint64_t BIO_number_read(const BIO *bio) {
  return bio->num_read;
}

OPENSSL_EXPORT uint64_t BIO_number_written(const BIO *bio) {
  return bio->num_write;
}

BIO *BIO_push(BIO *bio, BIO *appended_bio) {
  BIO *last_bio;

  if (bio == NULL) {
    return bio;
  }

  last_bio = bio;
  while (last_bio->next_bio != NULL) {
    last_bio = last_bio->next_bio;
  }

  last_bio->next_bio = appended_bio;
  return bio;
}

BIO *BIO_pop(BIO *bio) {
  BIO *ret;

  if (bio == NULL) {
    return NULL;
  }
  ret = bio->next_bio;
  bio->next_bio = NULL;
  return ret;
}

BIO *BIO_next(BIO *bio) {
  if (!bio) {
    return NULL;
  }
  return bio->next_bio;
}

BIO *BIO_find_type(BIO *bio, int type) {
  int method_type, mask;

  if (!bio) {
    return NULL;
  }
  mask = type & 0xff;

  do {
    if (bio->method != NULL) {
      method_type = bio->method->type;

      if (!mask) {
        if (method_type & type) {
          return bio;
        }
      } else if (method_type == type) {
        return bio;
      }
    }
    bio = bio->next_bio;
  } while (bio != NULL);

  return NULL;
}

int BIO_indent(BIO *bio, unsigned indent, unsigned max_indent) {
  if (indent > max_indent) {
    indent = max_indent;
  }

  while (indent--) {
    if (BIO_puts(bio, " ") != 1) {
      return 0;
    }
  }
  return 1;
}

static int print_bio(const char *str, size_t len, void *bio) {
  return BIO_write_all((BIO *)bio, str, len);
}

void ERR_print_errors(BIO *bio) {
  ERR_print_errors_cb(print_bio, bio);
}

// bio_read_all reads everything from |bio| and prepends |prefix| to it. On
// success, |*out| is set to an allocated buffer (which should be freed with
// |OPENSSL_free|), |*out_len| is set to its length and one is returned. The
// buffer will contain |prefix| followed by the contents of |bio|. On failure,
// zero is returned.
//
// The function will fail if the size of the output would equal or exceed
// |max_len|.
static int bio_read_all(BIO *bio, uint8_t **out, size_t *out_len,
                        const uint8_t *prefix, size_t prefix_len,
                        size_t max_len) {
  static const size_t kChunkSize = 4096;

  size_t len = prefix_len + kChunkSize;
  if (len > max_len) {
    len = max_len;
  }
  if (len < prefix_len) {
    return 0;
  }
  *out = OPENSSL_malloc(len);
  if (*out == NULL) {
    return 0;
  }
  OPENSSL_memcpy(*out, prefix, prefix_len);
  size_t done = prefix_len;

  for (;;) {
    if (done == len) {
      OPENSSL_free(*out);
      return 0;
    }
    size_t todo = len - done;
    if (todo > INT_MAX) {
      todo = INT_MAX;
    }
    const int n = BIO_read(bio, *out + done, (int)todo);
    if (n == 0) {
      *out_len = done;
      return 1;
    } else if (n == -1) {
      OPENSSL_free(*out);
      return 0;
    }

    done += n;
    if (len < max_len && len - done < kChunkSize / 2) {
      len += kChunkSize;
      if (len < kChunkSize || len > max_len) {
        len = max_len;
      }
      uint8_t *new_buf = OPENSSL_realloc(*out, len);
      if (new_buf == NULL) {
        OPENSSL_free(*out);
        return 0;
      }
      *out = new_buf;
    }
  }
}

// bio_read_full reads |len| bytes |bio| and writes them into |out|. It
// tolerates partial reads from |bio| and returns one on success or zero if a
// read fails before |len| bytes are read. On failure, it additionally sets
// |*out_eof_on_first_read| to whether the error was due to |bio| returning zero
// on the first read. |out_eof_on_first_read| may be NULL to discard the value.
static int bio_read_full(BIO *bio, uint8_t *out, int *out_eof_on_first_read,
                         size_t len) {
  int first_read = 1;
  while (len > 0) {
    int todo = len <= INT_MAX ? (int)len : INT_MAX;
    int ret = BIO_read(bio, out, todo);
    if (ret <= 0) {
      if (out_eof_on_first_read != NULL) {
        *out_eof_on_first_read = first_read && ret == 0;
      }
      return 0;
    }
    out += ret;
    len -= (size_t)ret;
    first_read = 0;
  }

  return 1;
}

// For compatibility with existing |d2i_*_bio| callers, |BIO_read_asn1| uses
// |ERR_LIB_ASN1| errors.
OPENSSL_DECLARE_ERROR_REASON(ASN1, ASN1_R_DECODE_ERROR)
OPENSSL_DECLARE_ERROR_REASON(ASN1, ASN1_R_HEADER_TOO_LONG)
OPENSSL_DECLARE_ERROR_REASON(ASN1, ASN1_R_NOT_ENOUGH_DATA)
OPENSSL_DECLARE_ERROR_REASON(ASN1, ASN1_R_TOO_LONG)

int BIO_read_asn1(BIO *bio, uint8_t **out, size_t *out_len, size_t max_len) {
  uint8_t header[6];

  static const size_t kInitialHeaderLen = 2;
  int eof_on_first_read;
  if (!bio_read_full(bio, header, &eof_on_first_read, kInitialHeaderLen)) {
    if (eof_on_first_read) {
      // Historically, OpenSSL returned |ASN1_R_HEADER_TOO_LONG| when
      // |d2i_*_bio| could not read anything. CPython conditions on this to
      // determine if |bio| was empty.
      OPENSSL_PUT_ERROR(ASN1, ASN1_R_HEADER_TOO_LONG);
    } else {
      OPENSSL_PUT_ERROR(ASN1, ASN1_R_NOT_ENOUGH_DATA);
    }
    return 0;
  }

  const uint8_t tag = header[0];
  const uint8_t length_byte = header[1];

  if ((tag & 0x1f) == 0x1f) {
    // Long form tags are not supported.
    OPENSSL_PUT_ERROR(ASN1, ASN1_R_DECODE_ERROR);
    return 0;
  }

  size_t len, header_len;
  if ((length_byte & 0x80) == 0) {
    // Short form length.
    len = length_byte;
    header_len = kInitialHeaderLen;
  } else {
    const size_t num_bytes = length_byte & 0x7f;

    if ((tag & 0x20 /* constructed */) != 0 && num_bytes == 0) {
      // indefinite length.
      if (!bio_read_all(bio, out, out_len, header, kInitialHeaderLen,
                        max_len)) {
        OPENSSL_PUT_ERROR(ASN1, ASN1_R_NOT_ENOUGH_DATA);
        return 0;
      }
      return 1;
    }

    if (num_bytes == 0 || num_bytes > 4) {
      OPENSSL_PUT_ERROR(ASN1, ASN1_R_DECODE_ERROR);
      return 0;
    }

    if (!bio_read_full(bio, header + kInitialHeaderLen, NULL, num_bytes)) {
      OPENSSL_PUT_ERROR(ASN1, ASN1_R_NOT_ENOUGH_DATA);
      return 0;
    }
    header_len = kInitialHeaderLen + num_bytes;

    uint32_t len32 = 0;
    for (unsigned i = 0; i < num_bytes; i++) {
      len32 <<= 8;
      len32 |= header[kInitialHeaderLen + i];
    }

    if (len32 < 128) {
      // Length should have used short-form encoding.
      OPENSSL_PUT_ERROR(ASN1, ASN1_R_DECODE_ERROR);
      return 0;
    }

    if ((len32 >> ((num_bytes-1)*8)) == 0) {
      // Length should have been at least one byte shorter.
      OPENSSL_PUT_ERROR(ASN1, ASN1_R_DECODE_ERROR);
      return 0;
    }

    len = len32;
  }

  if (len + header_len < len ||
      len + header_len > max_len ||
      len > INT_MAX) {
    OPENSSL_PUT_ERROR(ASN1, ASN1_R_TOO_LONG);
    return 0;
  }
  len += header_len;
  *out_len = len;

  *out = OPENSSL_malloc(len);
  if (*out == NULL) {
    return 0;
  }
  OPENSSL_memcpy(*out, header, header_len);
  if (!bio_read_full(bio, (*out) + header_len, NULL, len - header_len)) {
    OPENSSL_PUT_ERROR(ASN1, ASN1_R_NOT_ENOUGH_DATA);
    OPENSSL_free(*out);
    return 0;
  }

  return 1;
}

void BIO_set_retry_special(BIO *bio) {
  bio->flags |= BIO_FLAGS_READ | BIO_FLAGS_IO_SPECIAL;
}

int BIO_set_write_buffer_size(BIO *bio, int buffer_size) { return 0; }

static CRYPTO_MUTEX g_index_lock = CRYPTO_MUTEX_INIT;
static int g_index = BIO_TYPE_START;

int BIO_get_new_index(void) {
  CRYPTO_MUTEX_lock_write(&g_index_lock);
  // If |g_index| exceeds 255, it will collide with the flags bits.
  int ret = g_index > 255 ? -1 : g_index++;
  CRYPTO_MUTEX_unlock_write(&g_index_lock);
  return ret;
}

BIO_METHOD *BIO_meth_new(int type, const char *name) {
  BIO_METHOD *method = OPENSSL_zalloc(sizeof(BIO_METHOD));
  if (method == NULL) {
    return NULL;
  }
  method->type = type;
  method->name = name;
  return method;
}

void BIO_meth_free(BIO_METHOD *method) {
  OPENSSL_free(method);
}

int BIO_meth_set_create(BIO_METHOD *method,
                        int (*create_func)(BIO *)) {
  method->create = create_func;
  return 1;
}

int BIO_meth_set_destroy(BIO_METHOD *method,
                         int (*destroy_func)(BIO *)) {
  method->destroy = destroy_func;
  return 1;
}

int BIO_meth_set_write(BIO_METHOD *method,
                       int (*write_func)(BIO *, const char *, int)) {
  method->bwrite = write_func;
  return 1;
}

int BIO_meth_set_read(BIO_METHOD *method,
                      int (*read_func)(BIO *, char *, int)) {
  method->bread = read_func;
  return 1;
}

int BIO_meth_set_gets(BIO_METHOD *method,
                      int (*gets_func)(BIO *, char *, int)) {
  method->bgets = gets_func;
  return 1;
}

int BIO_meth_set_ctrl(BIO_METHOD *method,
                      long (*ctrl_func)(BIO *, int, long, void *)) {
  method->ctrl = ctrl_func;
  return 1;
}

void BIO_set_data(BIO *bio, void *ptr) { bio->ptr = ptr; }

void *BIO_get_data(BIO *bio) { return bio->ptr; }

void BIO_set_init(BIO *bio, int init) { bio->init = init; }

int BIO_get_init(BIO *bio) { return bio->init; }

void BIO_set_shutdown(BIO *bio, int shutdown) { bio->shutdown = shutdown; }

int BIO_get_shutdown(BIO *bio) { return bio->shutdown; }

int BIO_meth_set_puts(BIO_METHOD *method, int (*puts)(BIO *, const char *)) {
  // Ignore the parameter. We implement |BIO_puts| using |BIO_write|.
  return 1;
}

int BIO_get_ex_new_index(long argl, void *argp,
                                    CRYPTO_EX_unused *unused,
                                    CRYPTO_EX_dup *dup_unused,
                                    CRYPTO_EX_free *free_func) {
  return CRYPTO_get_ex_new_index_ex(&g_ex_data_class, argl, argp, free_func);
}

int BIO_set_ex_data(BIO *bio, int idx, void *data) {
  return CRYPTO_set_ex_data(&bio->ex_data, idx, data);
}

void *BIO_get_ex_data(const BIO *bio, int idx) {
  return CRYPTO_get_ex_data(&bio->ex_data, idx);
}

Coverage Report

Created: 2024-11-21 07:03

Line	Count	Source (jump to first uncovered line)
1		/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
2		* All rights reserved.
3		*
4		* This package is an SSL implementation written
5		* by Eric Young (eay@cryptsoft.com).
6		* The implementation was written so as to conform with Netscapes SSL.
7		*
8		* This library is free for commercial and non-commercial use as long as
9		* the following conditions are aheared to. The following conditions
10		* apply to all code found in this distribution, be it the RC4, RSA,
11		* lhash, DES, etc., code; not just the SSL code. The SSL documentation
12		* included with this distribution is covered by the same copyright terms
13		* except that the holder is Tim Hudson (tjh@cryptsoft.com).
14		*
15		* Copyright remains Eric Young's, and as such any Copyright notices in
16		* the code are not to be removed.
17		* If this package is used in a product, Eric Young should be given attribution
18		* as the author of the parts of the library used.
19		* This can be in the form of a textual message at program startup or
20		* in documentation (online or textual) provided with the package.
21		*
22		* Redistribution and use in source and binary forms, with or without
23		* modification, are permitted provided that the following conditions
24		* are met:
25		* 1. Redistributions of source code must retain the copyright
26		* notice, this list of conditions and the following disclaimer.
27		* 2. Redistributions in binary form must reproduce the above copyright
28		* notice, this list of conditions and the following disclaimer in the
29		* documentation and/or other materials provided with the distribution.
30		* 3. All advertising materials mentioning features or use of this software
31		* must display the following acknowledgement:
32		* "This product includes cryptographic software written by
33		* Eric Young (eay@cryptsoft.com)"
34		* The word 'cryptographic' can be left out if the rouines from the library
35		* being used are not cryptographic related :-).
36		* 4. If you include any Windows specific code (or a derivative thereof) from
37		* the apps directory (application code) you must include an acknowledgement:
38		* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
39		*
40		* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41		* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42		* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43		* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44		* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45		* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46		* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47		* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48		* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49		* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50		* SUCH DAMAGE.
51		*
52		* The licence and distribution terms for any publically available version or
53		* derivative of this code cannot be changed. i.e. this code cannot simply be
54		* copied and put under another distribution licence
55		* [including the GNU Public Licence.] */
56
57		#include <openssl/bio.h>
58
59		#include <assert.h>
60		#include <errno.h>
61		#include <limits.h>
62		#include <string.h>
63
64		#include <openssl/asn1.h>
65		#include <openssl/err.h>
66		#include <openssl/mem.h>
67		#include <openssl/thread.h>
68
69		#include "../internal.h"
70
71
72		static CRYPTO_EX_DATA_CLASS g_ex_data_class =
73		CRYPTO_EX_DATA_CLASS_INIT_WITH_APP_DATA;
74
75	0	BIO BIO_new(const BIO_METHOD method) {
76	0	BIO *ret = OPENSSL_zalloc(sizeof(BIO));
77	0	if (ret == NULL) {
78	0	return NULL;
79	0	}
80
81	0	ret->method = method;
82	0	ret->shutdown = 1;
83	0	ret->references = 1;
84	0	CRYPTO_new_ex_data(&ret->ex_data);
85
86	0	if (method->create != NULL && !method->create(ret)) {
87	0	OPENSSL_free(ret);
88	0	return NULL;
89	0	}
90
91	0	return ret;
92	0	}
93
94	0	int BIO_free(BIO *bio) {
95	0	BIO *next_bio;
96
97	0	for (; bio != NULL; bio = next_bio) {
98	0	if (!CRYPTO_refcount_dec_and_test_zero(&bio->references)) {
99	0	return 0;
100	0	}
101
102	0	next_bio = BIO_pop(bio);
103
104	0	if (bio->method != NULL && bio->method->destroy != NULL) {
105	0	bio->method->destroy(bio);
106	0	}
107
108	0	CRYPTO_free_ex_data(&g_ex_data_class, bio, &bio->ex_data);
109	0	OPENSSL_free(bio);
110	0	}
111	0	return 1;
112	0	}
113
114	0	int BIO_up_ref(BIO *bio) {
115	0	CRYPTO_refcount_inc(&bio->references);
116	0	return 1;
117	0	}
118
119	0	void BIO_vfree(BIO *bio) {
120	0	BIO_free(bio);
121	0	}
122
123		void BIO_free_all(BIO *bio) {
124		BIO_free(bio);
125		}
126
127		int BIO_read(BIO bio, void buf, int len) {
128		if (bio == NULL \|\| bio->method == NULL \|\| bio->method->bread == NULL) {
129		OPENSSL_PUT_ERROR(BIO, BIO_R_UNSUPPORTED_METHOD);
130		return -2;
131		}
132		if (!bio->init) {
133		OPENSSL_PUT_ERROR(BIO, BIO_R_UNINITIALIZED);
134		return -2;
135		}
136		if (len <= 0) {
137		return 0;
138		}
139		int ret = bio->method->bread(bio, buf, len);
140		if (ret > 0) {
141		bio->num_read += ret;
142		}
143		return ret;
144		}
145
146	0	int BIO_gets(BIO bio, char buf, int len) {
147	0	if (bio == NULL \|\| bio->method == NULL \|\| bio->method->bgets == NULL) {
148	0	OPENSSL_PUT_ERROR(BIO, BIO_R_UNSUPPORTED_METHOD);
149	0	return -2;
150	0	}
151	0	if (!bio->init) {
152	0	OPENSSL_PUT_ERROR(BIO, BIO_R_UNINITIALIZED);
153	0	return -2;
154	0	}
155	0	if (len <= 0) {
156	0	return 0;
157	0	}
158	0	int ret = bio->method->bgets(bio, buf, len);
159	0	if (ret > 0) {
160	0	bio->num_read += ret;
161	0	}
162	0	return ret;
163	0	}
164
165	0	int BIO_write(BIO bio, const void in, int inl) {
166	0	if (bio == NULL \|\| bio->method == NULL \|\| bio->method->bwrite == NULL) {
167	0	OPENSSL_PUT_ERROR(BIO, BIO_R_UNSUPPORTED_METHOD);
168	0	return -2;
169	0	}
170	0	if (!bio->init) {
171	0	OPENSSL_PUT_ERROR(BIO, BIO_R_UNINITIALIZED);
172	0	return -2;
173	0	}
174	0	if (inl <= 0) {
175	0	return 0;
176	0	}
177	0	int ret = bio->method->bwrite(bio, in, inl);
178	0	if (ret > 0) {
179	0	bio->num_write += ret;
180	0	}
181	0	return ret;
182	0	}
183
184	0	int BIO_write_all(BIO bio, const void data, size_t len) {
185	0	const uint8_t *data_u8 = data;
186	0	while (len > 0) {
187	0	int ret = BIO_write(bio, data_u8, len > INT_MAX ? INT_MAX : (int)len);
188	0	if (ret <= 0) {
189	0	return 0;
190	0	}
191	0	data_u8 += ret;
192	0	len -= ret;
193	0	}
194	0	return 1;
195	0	}
196
197	0	int BIO_puts(BIO bio, const char in) {
198	0	size_t len = strlen(in);
199	0	if (len > INT_MAX) {
200		// \|BIO_write\| and the return value both assume the string fits in \|int\|.
201	0	OPENSSL_PUT_ERROR(BIO, ERR_R_OVERFLOW);
202	0	return -1;
203	0	}
204	0	return BIO_write(bio, in, (int)len);
205	0	}
206
207	0	int BIO_flush(BIO *bio) {
208	0	return (int)BIO_ctrl(bio, BIO_CTRL_FLUSH, 0, NULL);
209	0	}
210
211		long BIO_ctrl(BIO bio, int cmd, long larg, void parg) {
212		if (bio == NULL) {
213		return 0;
214		}
215
216		if (bio->method == NULL \|\| bio->method->ctrl == NULL) {
217		OPENSSL_PUT_ERROR(BIO, BIO_R_UNSUPPORTED_METHOD);
218		return -2;
219		}
220
221		return bio->method->ctrl(bio, cmd, larg, parg);
222		}
223
224	0	char BIO_ptr_ctrl(BIO b, int cmd, long larg) {
225	0	char *p = NULL;
226
227	0	if (BIO_ctrl(b, cmd, larg, (void *)&p) <= 0) {
228	0	return NULL;
229	0	}
230
231	0	return p;
232	0	}
233
234	0	long BIO_int_ctrl(BIO *b, int cmd, long larg, int iarg) {
235	0	int i = iarg;
236
237	0	return BIO_ctrl(b, cmd, larg, (void *)&i);
238	0	}
239
240	0	int BIO_reset(BIO *bio) {
241	0	return (int)BIO_ctrl(bio, BIO_CTRL_RESET, 0, NULL);
242	0	}
243
244	0	int BIO_eof(BIO *bio) {
245	0	return (int)BIO_ctrl(bio, BIO_CTRL_EOF, 0, NULL);
246	0	}
247
248	8	void BIO_set_flags(BIO *bio, int flags) {
249	8	bio->flags \|= flags;
250	8	}
251
252	11	int BIO_test_flags(const BIO *bio, int flags) {
253	11	return bio->flags & flags;
254	11	}
255
256	0	int BIO_should_read(const BIO *bio) {
257	0	return BIO_test_flags(bio, BIO_FLAGS_READ);
258	0	}
259
260	0	int BIO_should_write(const BIO *bio) {
261	0	return BIO_test_flags(bio, BIO_FLAGS_WRITE);
262	0	}
263
264	0	int BIO_should_retry(const BIO *bio) {
265	0	return BIO_test_flags(bio, BIO_FLAGS_SHOULD_RETRY);
266	0	}
267
268	0	int BIO_should_io_special(const BIO *bio) {
269	0	return BIO_test_flags(bio, BIO_FLAGS_IO_SPECIAL);
270	0	}
271
272	0	int BIO_get_retry_reason(const BIO *bio) { return bio->retry_reason; }
273
274	0	void BIO_set_retry_reason(BIO *bio, int reason) { bio->retry_reason = reason; }
275
276	15	void BIO_clear_flags(BIO *bio, int flags) {
277	15	bio->flags &= ~flags;
278	15	}
279
280	0	void BIO_set_retry_read(BIO *bio) {
281	0	bio->flags \|= BIO_FLAGS_READ \| BIO_FLAGS_SHOULD_RETRY;
282	0	}
283
284	0	void BIO_set_retry_write(BIO *bio) {
285	0	bio->flags \|= BIO_FLAGS_WRITE \| BIO_FLAGS_SHOULD_RETRY;
286	0	}
287
288		static const int kRetryFlags = BIO_FLAGS_RWS \| BIO_FLAGS_SHOULD_RETRY;
289
290	0	int BIO_get_retry_flags(BIO *bio) {
291	0	return bio->flags & kRetryFlags;
292	0	}
293
294	0	void BIO_clear_retry_flags(BIO *bio) {
295	0	bio->flags &= ~kRetryFlags;
296	0	bio->retry_reason = 0;
297	0	}
298
299	0	int BIO_method_type(const BIO *bio) { return bio->method->type; }
300
301	8	void BIO_copy_next_retry(BIO *bio) {
302	8	BIO_clear_retry_flags(bio);
303	8	BIO_set_flags(bio, BIO_get_retry_flags(bio->next_bio));
304	8	bio->retry_reason = bio->next_bio->retry_reason;
305	8	}
306
307	0	long BIO_callback_ctrl(BIO *bio, int cmd, bio_info_cb fp) {
308	0	if (bio == NULL) {
309	0	return 0;
310	0	}
311
312	0	if (bio->method == NULL \|\| bio->method->callback_ctrl == NULL) {
313	0	OPENSSL_PUT_ERROR(BIO, BIO_R_UNSUPPORTED_METHOD);
314	0	return 0;
315	0	}
316
317	0	return bio->method->callback_ctrl(bio, cmd, fp);
318	0	}
319
320	0	size_t BIO_pending(const BIO *bio) {
321	0	const long r = BIO_ctrl((BIO *) bio, BIO_CTRL_PENDING, 0, NULL);
322	0	assert(r >= 0);
323
324	0	if (r < 0) {
325	0	return 0;
326	0	}
327	0	return r;
328	0	}
329
330	0	size_t BIO_ctrl_pending(const BIO *bio) {
331	0	return BIO_pending(bio);
332	0	}
333
334	0	size_t BIO_wpending(const BIO *bio) {
335	0	const long r = BIO_ctrl((BIO *) bio, BIO_CTRL_WPENDING, 0, NULL);
336	0	assert(r >= 0);
337
338	0	if (r < 0) {
339	0	return 0;
340	0	}
341	0	return r;
342	0	}
343
344	0	int BIO_set_close(BIO *bio, int close_flag) {
345	0	return (int)BIO_ctrl(bio, BIO_CTRL_SET_CLOSE, close_flag, NULL);
346	0	}
347
348	0	OPENSSL_EXPORT uint64_t BIO_number_read(const BIO *bio) {
349	0	return bio->num_read;
350	0	}
351
352	0	OPENSSL_EXPORT uint64_t BIO_number_written(const BIO *bio) {
353	0	return bio->num_write;
354	0	}
355
356	0	BIO BIO_push(BIO bio, BIO *appended_bio) {
357	0	BIO *last_bio;
358
359	0	if (bio == NULL) {
360	0	return bio;
361	0	}
362
363	0	last_bio = bio;
364	0	while (last_bio->next_bio != NULL) {
365	0	last_bio = last_bio->next_bio;
366	0	}
367
368	0	last_bio->next_bio = appended_bio;
369	0	return bio;
370	0	}
371
372	0	BIO BIO_pop(BIO bio) {
373	0	BIO *ret;
374
375	0	if (bio == NULL) {
376	0	return NULL;
377	0	}
378	0	ret = bio->next_bio;
379	0	bio->next_bio = NULL;
380	0	return ret;
381	0	}
382
383		BIO BIO_next(BIO bio) {
384		if (!bio) {
385		return NULL;
386		}
387		return bio->next_bio;
388		}
389
390	0	BIO BIO_find_type(BIO bio, int type) {
391	0	int method_type, mask;
392
393	0	if (!bio) {
394	0	return NULL;
395	0	}
396	0	mask = type & 0xff;
397
398	0	do {
399	0	if (bio->method != NULL) {
400	0	method_type = bio->method->type;
401
402	0	if (!mask) {
403	0	if (method_type & type) {
404	0	return bio;
405	0	}
406	0	} else if (method_type == type) {
407	0	return bio;
408	0	}
409	0	}
410	0	bio = bio->next_bio;
411	0	} while (bio != NULL);
412
413	0	return NULL;
414	0	}
415
416	0	int BIO_indent(BIO *bio, unsigned indent, unsigned max_indent) {
417	0	if (indent > max_indent) {
418	0	indent = max_indent;
419	0	}
420
421	0	while (indent--) {
422	0	if (BIO_puts(bio, " ") != 1) {
423	0	return 0;
424	0	}
425	0	}
426	0	return 1;
427	0	}
428
429	0	static int print_bio(const char str, size_t len, void bio) {
430	0	return BIO_write_all((BIO *)bio, str, len);
431	0	}
432
433	0	void ERR_print_errors(BIO *bio) {
434	0	ERR_print_errors_cb(print_bio, bio);
435	0	}
436
437		// bio_read_all reads everything from \|bio\| and prepends \|prefix\| to it. On
438		// success, \|*out\| is set to an allocated buffer (which should be freed with
439		// \|OPENSSL_free\|), \|*out_len\| is set to its length and one is returned. The
440		// buffer will contain \|prefix\| followed by the contents of \|bio\|. On failure,
441		// zero is returned.
442		//
443		// The function will fail if the size of the output would equal or exceed
444		// \|max_len\|.
445		static int bio_read_all(BIO bio, uint8_t out, size_t out_len,
446		const uint8_t *prefix, size_t prefix_len,
447	0	size_t max_len) {
448	0	static const size_t kChunkSize = 4096;
449
450	0	size_t len = prefix_len + kChunkSize;
451	0	if (len > max_len) {
452	0	len = max_len;
453	0	}
454	0	if (len < prefix_len) {
455	0	return 0;
456	0	}
457	0	*out = OPENSSL_malloc(len);
458	0	if (*out == NULL) {
459	0	return 0;
460	0	}
461	0	OPENSSL_memcpy(*out, prefix, prefix_len);
462	0	size_t done = prefix_len;
463
464	0	for (;;) {
465	0	if (done == len) {
466	0	OPENSSL_free(*out);
467	0	return 0;
468	0	}
469	0	size_t todo = len - done;
470	0	if (todo > INT_MAX) {
471	0	todo = INT_MAX;
472	0	}
473	0	const int n = BIO_read(bio, *out + done, (int)todo);
474	0	if (n == 0) {
475	0	*out_len = done;
476	0	return 1;
477	0	} else if (n == -1) {
478	0	OPENSSL_free(*out);
479	0	return 0;
480	0	}
481
482	0	done += n;
483	0	if (len < max_len && len - done < kChunkSize / 2) {
484	0	len += kChunkSize;
485	0	if (len < kChunkSize \|\| len > max_len) {
486	0	len = max_len;
487	0	}
488	0	uint8_t new_buf = OPENSSL_realloc(out, len);
489	0	if (new_buf == NULL) {
490	0	OPENSSL_free(*out);
491	0	return 0;
492	0	}
493	0	*out = new_buf;
494	0	}
495	0	}
496	0	}
497
498		// bio_read_full reads \|len\| bytes \|bio\| and writes them into \|out\|. It
499		// tolerates partial reads from \|bio\| and returns one on success or zero if a
500		// read fails before \|len\| bytes are read. On failure, it additionally sets
501		// \|*out_eof_on_first_read\| to whether the error was due to \|bio\| returning zero
502		// on the first read. \|out_eof_on_first_read\| may be NULL to discard the value.
503		static int bio_read_full(BIO bio, uint8_t out, int *out_eof_on_first_read,
504	0	size_t len) {
505	0	int first_read = 1;
506	0	while (len > 0) {
507	0	int todo = len <= INT_MAX ? (int)len : INT_MAX;
508	0	int ret = BIO_read(bio, out, todo);
509	0	if (ret <= 0) {
510	0	if (out_eof_on_first_read != NULL) {
511	0	*out_eof_on_first_read = first_read && ret == 0;
512	0	}
513	0	return 0;
514	0	}
515	0	out += ret;
516	0	len -= (size_t)ret;
517	0	first_read = 0;
518	0	}
519
520	0	return 1;
521	0	}
522
523		// For compatibility with existing \|d2i_*_bio\| callers, \|BIO_read_asn1\| uses
524		// \|ERR_LIB_ASN1\| errors.
525		OPENSSL_DECLARE_ERROR_REASON(ASN1, ASN1_R_DECODE_ERROR)
526		OPENSSL_DECLARE_ERROR_REASON(ASN1, ASN1_R_HEADER_TOO_LONG)
527		OPENSSL_DECLARE_ERROR_REASON(ASN1, ASN1_R_NOT_ENOUGH_DATA)
528		OPENSSL_DECLARE_ERROR_REASON(ASN1, ASN1_R_TOO_LONG)
529
530	0	int BIO_read_asn1(BIO bio, uint8_t out, size_t out_len, size_t max_len) {
531	0	uint8_t header[6];
532
533	0	static const size_t kInitialHeaderLen = 2;
534	0	int eof_on_first_read;
535	0	if (!bio_read_full(bio, header, &eof_on_first_read, kInitialHeaderLen)) {
536	0	if (eof_on_first_read) {
537		// Historically, OpenSSL returned \|ASN1_R_HEADER_TOO_LONG\| when
538		// \|d2i_*_bio\| could not read anything. CPython conditions on this to
539		// determine if \|bio\| was empty.
540	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_HEADER_TOO_LONG);
541	0	} else {
542	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_NOT_ENOUGH_DATA);
543	0	}
544	0	return 0;
545	0	}
546
547	0	const uint8_t tag = header[0];
548	0	const uint8_t length_byte = header[1];
549
550	0	if ((tag & 0x1f) == 0x1f) {
551		// Long form tags are not supported.
552	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_DECODE_ERROR);
553	0	return 0;
554	0	}
555
556	0	size_t len, header_len;
557	0	if ((length_byte & 0x80) == 0) {
558		// Short form length.
559	0	len = length_byte;
560	0	header_len = kInitialHeaderLen;
561	0	} else {
562	0	const size_t num_bytes = length_byte & 0x7f;
563
564	0	if ((tag & 0x20 /* constructed */) != 0 && num_bytes == 0) {
565		// indefinite length.
566	0	if (!bio_read_all(bio, out, out_len, header, kInitialHeaderLen,
567	0	max_len)) {
568	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_NOT_ENOUGH_DATA);
569	0	return 0;
570	0	}
571	0	return 1;
572	0	}
573
574	0	if (num_bytes == 0 \|\| num_bytes > 4) {
575	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_DECODE_ERROR);
576	0	return 0;
577	0	}
578
579	0	if (!bio_read_full(bio, header + kInitialHeaderLen, NULL, num_bytes)) {
580	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_NOT_ENOUGH_DATA);
581	0	return 0;
582	0	}
583	0	header_len = kInitialHeaderLen + num_bytes;
584
585	0	uint32_t len32 = 0;
586	0	for (unsigned i = 0; i < num_bytes; i++) {
587	0	len32 <<= 8;
588	0	len32 \|= header[kInitialHeaderLen + i];
589	0	}
590
591	0	if (len32 < 128) {
592		// Length should have used short-form encoding.
593	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_DECODE_ERROR);
594	0	return 0;
595	0	}
596
597	0	if ((len32 >> ((num_bytes-1)*8)) == 0) {
598		// Length should have been at least one byte shorter.
599	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_DECODE_ERROR);
600	0	return 0;
601	0	}
602
603	0	len = len32;
604	0	}
605
606	0	if (len + header_len < len \|\|
607	0	len + header_len > max_len \|\|
608	0	len > INT_MAX) {
609	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_TOO_LONG);
610	0	return 0;
611	0	}
612	0	len += header_len;
613	0	*out_len = len;
614
615	0	*out = OPENSSL_malloc(len);
616	0	if (*out == NULL) {
617	0	return 0;
618	0	}
619	0	OPENSSL_memcpy(*out, header, header_len);
620	0	if (!bio_read_full(bio, (*out) + header_len, NULL, len - header_len)) {
621	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_NOT_ENOUGH_DATA);
622	0	OPENSSL_free(*out);
623	0	return 0;
624	0	}
625
626	0	return 1;
627	0	}
628
629	0	void BIO_set_retry_special(BIO *bio) {
630	0	bio->flags \|= BIO_FLAGS_READ \| BIO_FLAGS_IO_SPECIAL;
631	0	}
632
633	0	int BIO_set_write_buffer_size(BIO *bio, int buffer_size) { return 0; }
634
635		static CRYPTO_MUTEX g_index_lock = CRYPTO_MUTEX_INIT;
636		static int g_index = BIO_TYPE_START;
637
638	0	int BIO_get_new_index(void) {
639	0	CRYPTO_MUTEX_lock_write(&g_index_lock);
640		// If \|g_index\| exceeds 255, it will collide with the flags bits.
641	0	int ret = g_index > 255 ? -1 : g_index++;
642	0	CRYPTO_MUTEX_unlock_write(&g_index_lock);
643	0	return ret;
644	0	}
645
646		BIO_METHOD BIO_meth_new(int type, const char name) {
647		BIO_METHOD *method = OPENSSL_zalloc(sizeof(BIO_METHOD));
648		if (method == NULL) {
649		return NULL;
650		}
651		method->type = type;
652		method->name = name;
653		return method;
654		}
655
656		void BIO_meth_free(BIO_METHOD *method) {
657		OPENSSL_free(method);
658		}
659
660		int BIO_meth_set_create(BIO_METHOD *method,
661	2	int (create_func)(BIO )) {
662	2	method->create = create_func;
663	2	return 1;
664	2	}
665
666		int BIO_meth_set_destroy(BIO_METHOD *method,
667	2	int (destroy_func)(BIO )) {
668	2	method->destroy = destroy_func;
669	2	return 1;
670	2	}
671
672		int BIO_meth_set_write(BIO_METHOD *method,
673	0	int (write_func)(BIO , const char *, int)) {
674	0	method->bwrite = write_func;
675	0	return 1;
676	0	}
677
678		int BIO_meth_set_read(BIO_METHOD *method,
679	0	int (read_func)(BIO , char *, int)) {
680	0	method->bread = read_func;
681	0	return 1;
682	0	}
683
684		int BIO_meth_set_gets(BIO_METHOD *method,
685	2	int (gets_func)(BIO , char *, int)) {
686	2	method->bgets = gets_func;
687	2	return 1;
688	2	}
689
690		int BIO_meth_set_ctrl(BIO_METHOD *method,
691	2	long (ctrl_func)(BIO , int, long, void *)) {
692	2	method->ctrl = ctrl_func;
693	2	return 1;
694	2	}
695
696	8	void BIO_set_data(BIO bio, void ptr) { bio->ptr = ptr; }
697
698	20	void BIO_get_data(BIO bio) { return bio->ptr; }
699
700	12	void BIO_set_init(BIO *bio, int init) { bio->init = init; }
701
702	0	int BIO_get_init(BIO *bio) { return bio->init; }
703
704	0	void BIO_set_shutdown(BIO *bio, int shutdown) { bio->shutdown = shutdown; }
705
706	0	int BIO_get_shutdown(BIO *bio) { return bio->shutdown; }
707
708	2	int BIO_meth_set_puts(BIO_METHOD method, int (puts)(BIO , const char )) {
709		// Ignore the parameter. We implement \|BIO_puts\| using \|BIO_write\|.
710	2	return 1;
711	2	}
712
713		int BIO_get_ex_new_index(long argl, void *argp,
714		CRYPTO_EX_unused *unused,
715		CRYPTO_EX_dup *dup_unused,
716	0	CRYPTO_EX_free *free_func) {
717	0	return CRYPTO_get_ex_new_index_ex(&g_ex_data_class, argl, argp, free_func);
718	0	}
719
720	0	int BIO_set_ex_data(BIO bio, int idx, void data) {
721	0	return CRYPTO_set_ex_data(&bio->ex_data, idx, data);
722	0	}
723
724	0	void BIO_get_ex_data(const BIO bio, int idx) {
725	0	return CRYPTO_get_ex_data(&bio->ex_data, idx);
726	0	}