/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"


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

  OPENSSL_memset(ret, 0, sizeof(BIO));
  ret->method = method;
  ret->shutdown = 1;
  ret->references = 1;

  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);
    }

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

OPENSSL_EXPORT size_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 struct CRYPTO_STATIC_MUTEX g_index_lock = CRYPTO_STATIC_MUTEX_INIT;
static int g_index = BIO_TYPE_START;

int BIO_get_new_index(void) {
  CRYPTO_STATIC_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_STATIC_MUTEX_unlock_write(&g_index_lock);
  return ret;
}

BIO_METHOD *BIO_meth_new(int type, const char *name) {
  BIO_METHOD *method = OPENSSL_malloc(sizeof(BIO_METHOD));
  if (method == NULL) {
    return NULL;
  }
  OPENSSL_memset(method, 0, sizeof(BIO_METHOD));
  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)(BIO *)) {
  method->create = create;
  return 1;
}

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

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

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

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

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

Coverage Report

Created: 2023-06-07 07:11

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	2.46k	BIO BIO_new(const BIO_METHOD method) {
73	2.46k	BIO *ret = OPENSSL_malloc(sizeof(BIO));
74	2.46k	if (ret == NULL) {
75	0	return NULL;
76	0	}
77
78	2.46k	OPENSSL_memset(ret, 0, sizeof(BIO));
79	2.46k	ret->method = method;
80	2.46k	ret->shutdown = 1;
81	2.46k	ret->references = 1;
82
83	2.46k	if (method->create != NULL && !method->create(ret)) {
84	0	OPENSSL_free(ret);
85	0	return NULL;
86	0	}
87
88	2.46k	return ret;
89	2.46k	}
90
91	2.46k	int BIO_free(BIO *bio) {
92	2.46k	BIO *next_bio;
93
94	4.93k	for (; bio != NULL; bio = next_bio) {
95	2.46k	if (!CRYPTO_refcount_dec_and_test_zero(&bio->references)) {
96	0	return 0;
97	0	}
98
99	2.46k	next_bio = BIO_pop(bio);
100
101	2.46k	if (bio->method != NULL && bio->method->destroy != NULL) {
102	2.46k	bio->method->destroy(bio);
103	2.46k	}
104
105	2.46k	OPENSSL_free(bio);
106	2.46k	}
107	2.46k	return 1;
108	2.46k	}
109
110	0	int BIO_up_ref(BIO *bio) {
111	0	CRYPTO_refcount_inc(&bio->references);
112	0	return 1;
113	0	}
114
115	0	void BIO_vfree(BIO *bio) {
116	0	BIO_free(bio);
117	0	}
118
119	0	void BIO_free_all(BIO *bio) {
120	0	BIO_free(bio);
121	0	}
122
123	0	int BIO_read(BIO bio, void buf, int len) {
124	0	if (bio == NULL \|\| bio->method == NULL \|\| bio->method->bread == NULL) {
125	0	OPENSSL_PUT_ERROR(BIO, BIO_R_UNSUPPORTED_METHOD);
126	0	return -2;
127	0	}
128	0	if (!bio->init) {
129	0	OPENSSL_PUT_ERROR(BIO, BIO_R_UNINITIALIZED);
130	0	return -2;
131	0	}
132	0	if (len <= 0) {
133	0	return 0;
134	0	}
135	0	int ret = bio->method->bread(bio, buf, len);
136	0	if (ret > 0) {
137	0	bio->num_read += ret;
138	0	}
139	0	return ret;
140	0	}
141
142	0	int BIO_gets(BIO bio, char buf, int len) {
143	0	if (bio == NULL \|\| bio->method == NULL \|\| bio->method->bgets == NULL) {
144	0	OPENSSL_PUT_ERROR(BIO, BIO_R_UNSUPPORTED_METHOD);
145	0	return -2;
146	0	}
147	0	if (!bio->init) {
148	0	OPENSSL_PUT_ERROR(BIO, BIO_R_UNINITIALIZED);
149	0	return -2;
150	0	}
151	0	if (len <= 0) {
152	0	return 0;
153	0	}
154	0	int ret = bio->method->bgets(bio, buf, len);
155	0	if (ret > 0) {
156	0	bio->num_read += ret;
157	0	}
158	0	return ret;
159	0	}
160
161	627k	int BIO_write(BIO bio, const void in, int inl) {
162	627k	if (bio == NULL \|\| bio->method == NULL \|\| bio->method->bwrite == NULL) {
163	0	OPENSSL_PUT_ERROR(BIO, BIO_R_UNSUPPORTED_METHOD);
164	0	return -2;
165	0	}
166	627k	if (!bio->init) {
167	0	OPENSSL_PUT_ERROR(BIO, BIO_R_UNINITIALIZED);
168	0	return -2;
169	0	}
170	627k	if (inl <= 0) {
171	39	return 0;
172	39	}
173	627k	int ret = bio->method->bwrite(bio, in, inl);
174	627k	if (ret > 0) {
175	627k	bio->num_write += ret;
176	627k	}
177	627k	return ret;
178	627k	}
179
180	8.12k	int BIO_write_all(BIO bio, const void data, size_t len) {
181	8.12k	const uint8_t *data_u8 = data;
182	16.2k	while (len > 0) {
183	8.12k	int ret = BIO_write(bio, data_u8, len > INT_MAX ? INT_MAX : (int)len);
184	8.12k	if (ret <= 0) {
185	0	return 0;
186	0	}
187	8.12k	data_u8 += ret;
188	8.12k	len -= ret;
189	8.12k	}
190	8.12k	return 1;
191	8.12k	}
192
193	185k	int BIO_puts(BIO bio, const char in) {
194	185k	size_t len = strlen(in);
195	185k	if (len > INT_MAX) {
196		// \|BIO_write\| and the return value both assume the string fits in \|int\|.
197	0	OPENSSL_PUT_ERROR(BIO, ERR_R_OVERFLOW);
198	0	return -1;
199	0	}
200	185k	return BIO_write(bio, in, (int)len);
201	185k	}
202
203	0	int BIO_flush(BIO *bio) {
204	0	return (int)BIO_ctrl(bio, BIO_CTRL_FLUSH, 0, NULL);
205	0	}
206
207	0	long BIO_ctrl(BIO bio, int cmd, long larg, void parg) {
208	0	if (bio == NULL) {
209	0	return 0;
210	0	}
211
212	0	if (bio->method == NULL \|\| bio->method->ctrl == NULL) {
213	0	OPENSSL_PUT_ERROR(BIO, BIO_R_UNSUPPORTED_METHOD);
214	0	return -2;
215	0	}
216
217	0	return bio->method->ctrl(bio, cmd, larg, parg);
218	0	}
219
220	0	char BIO_ptr_ctrl(BIO b, int cmd, long larg) {
221	0	char *p = NULL;
222
223	0	if (BIO_ctrl(b, cmd, larg, (void *)&p) <= 0) {
224	0	return NULL;
225	0	}
226
227	0	return p;
228	0	}
229
230	0	long BIO_int_ctrl(BIO *b, int cmd, long larg, int iarg) {
231	0	int i = iarg;
232
233	0	return BIO_ctrl(b, cmd, larg, (void *)&i);
234	0	}
235
236	0	int BIO_reset(BIO *bio) {
237	0	return (int)BIO_ctrl(bio, BIO_CTRL_RESET, 0, NULL);
238	0	}
239
240	0	int BIO_eof(BIO *bio) {
241	0	return (int)BIO_ctrl(bio, BIO_CTRL_EOF, 0, NULL);
242	0	}
243
244	0	void BIO_set_flags(BIO *bio, int flags) {
245	0	bio->flags \|= flags;
246	0	}
247
248	0	int BIO_test_flags(const BIO *bio, int flags) {
249	0	return bio->flags & flags;
250	0	}
251
252	0	int BIO_should_read(const BIO *bio) {
253	0	return BIO_test_flags(bio, BIO_FLAGS_READ);
254	0	}
255
256	0	int BIO_should_write(const BIO *bio) {
257	0	return BIO_test_flags(bio, BIO_FLAGS_WRITE);
258	0	}
259
260	0	int BIO_should_retry(const BIO *bio) {
261	0	return BIO_test_flags(bio, BIO_FLAGS_SHOULD_RETRY);
262	0	}
263
264	0	int BIO_should_io_special(const BIO *bio) {
265	0	return BIO_test_flags(bio, BIO_FLAGS_IO_SPECIAL);
266	0	}
267
268	0	int BIO_get_retry_reason(const BIO *bio) { return bio->retry_reason; }
269
270	0	void BIO_set_retry_reason(BIO *bio, int reason) { bio->retry_reason = reason; }
271
272	0	void BIO_clear_flags(BIO *bio, int flags) {
273	0	bio->flags &= ~flags;
274	0	}
275
276	0	void BIO_set_retry_read(BIO *bio) {
277	0	bio->flags \|= BIO_FLAGS_READ \| BIO_FLAGS_SHOULD_RETRY;
278	0	}
279
280	0	void BIO_set_retry_write(BIO *bio) {
281	0	bio->flags \|= BIO_FLAGS_WRITE \| BIO_FLAGS_SHOULD_RETRY;
282	0	}
283
284		static const int kRetryFlags = BIO_FLAGS_RWS \| BIO_FLAGS_SHOULD_RETRY;
285
286	0	int BIO_get_retry_flags(BIO *bio) {
287	0	return bio->flags & kRetryFlags;
288	0	}
289
290	627k	void BIO_clear_retry_flags(BIO *bio) {
291	627k	bio->flags &= ~kRetryFlags;
292	627k	bio->retry_reason = 0;
293	627k	}
294
295	0	int BIO_method_type(const BIO *bio) { return bio->method->type; }
296
297	0	void BIO_copy_next_retry(BIO *bio) {
298	0	BIO_clear_retry_flags(bio);
299	0	BIO_set_flags(bio, BIO_get_retry_flags(bio->next_bio));
300	0	bio->retry_reason = bio->next_bio->retry_reason;
301	0	}
302
303	0	long BIO_callback_ctrl(BIO *bio, int cmd, bio_info_cb fp) {
304	0	if (bio == NULL) {
305	0	return 0;
306	0	}
307
308	0	if (bio->method == NULL \|\| bio->method->callback_ctrl == NULL) {
309	0	OPENSSL_PUT_ERROR(BIO, BIO_R_UNSUPPORTED_METHOD);
310	0	return 0;
311	0	}
312
313	0	return bio->method->callback_ctrl(bio, cmd, fp);
314	0	}
315
316	0	size_t BIO_pending(const BIO *bio) {
317	0	const long r = BIO_ctrl((BIO *) bio, BIO_CTRL_PENDING, 0, NULL);
318	0	assert(r >= 0);
319
320	0	if (r < 0) {
321	0	return 0;
322	0	}
323	0	return r;
324	0	}
325
326	0	size_t BIO_ctrl_pending(const BIO *bio) {
327	0	return BIO_pending(bio);
328	0	}
329
330	0	size_t BIO_wpending(const BIO *bio) {
331	0	const long r = BIO_ctrl((BIO *) bio, BIO_CTRL_WPENDING, 0, NULL);
332	0	assert(r >= 0);
333
334	0	if (r < 0) {
335	0	return 0;
336	0	}
337	0	return r;
338	0	}
339
340	0	int BIO_set_close(BIO *bio, int close_flag) {
341	0	return (int)BIO_ctrl(bio, BIO_CTRL_SET_CLOSE, close_flag, NULL);
342	0	}
343
344	0	OPENSSL_EXPORT size_t BIO_number_read(const BIO *bio) {
345	0	return bio->num_read;
346	0	}
347
348	0	OPENSSL_EXPORT size_t BIO_number_written(const BIO *bio) {
349	0	return bio->num_write;
350	0	}
351
352	0	BIO BIO_push(BIO bio, BIO *appended_bio) {
353	0	BIO *last_bio;
354
355	0	if (bio == NULL) {
356	0	return bio;
357	0	}
358
359	0	last_bio = bio;
360	0	while (last_bio->next_bio != NULL) {
361	0	last_bio = last_bio->next_bio;
362	0	}
363
364	0	last_bio->next_bio = appended_bio;
365	0	return bio;
366	0	}
367
368	2.46k	BIO BIO_pop(BIO bio) {
369	2.46k	BIO *ret;
370
371	2.46k	if (bio == NULL) {
372	0	return NULL;
373	0	}
374	2.46k	ret = bio->next_bio;
375	2.46k	bio->next_bio = NULL;
376	2.46k	return ret;
377	2.46k	}
378
379	0	BIO BIO_next(BIO bio) {
380	0	if (!bio) {
381	0	return NULL;
382	0	}
383	0	return bio->next_bio;
384	0	}
385
386	0	BIO BIO_find_type(BIO bio, int type) {
387	0	int method_type, mask;
388
389	0	if (!bio) {
390	0	return NULL;
391	0	}
392	0	mask = type & 0xff;
393
394	0	do {
395	0	if (bio->method != NULL) {
396	0	method_type = bio->method->type;
397
398	0	if (!mask) {
399	0	if (method_type & type) {
400	0	return bio;
401	0	}
402	0	} else if (method_type == type) {
403	0	return bio;
404	0	}
405	0	}
406	0	bio = bio->next_bio;
407	0	} while (bio != NULL);
408
409	0	return NULL;
410	0	}
411
412	13.2k	int BIO_indent(BIO *bio, unsigned indent, unsigned max_indent) {
413	13.2k	if (indent > max_indent) {
414	0	indent = max_indent;
415	0	}
416
417	177k	while (indent--) {
418	164k	if (BIO_puts(bio, " ") != 1) {
419	0	return 0;
420	0	}
421	164k	}
422	13.2k	return 1;
423	13.2k	}
424
425	8.12k	static int print_bio(const char str, size_t len, void bio) {
426	8.12k	return BIO_write_all((BIO *)bio, str, len);
427	8.12k	}
428
429	2.13k	void ERR_print_errors(BIO *bio) {
430	2.13k	ERR_print_errors_cb(print_bio, bio);
431	2.13k	}
432
433		// bio_read_all reads everything from \|bio\| and prepends \|prefix\| to it. On
434		// success, \|*out\| is set to an allocated buffer (which should be freed with
435		// \|OPENSSL_free\|), \|*out_len\| is set to its length and one is returned. The
436		// buffer will contain \|prefix\| followed by the contents of \|bio\|. On failure,
437		// zero is returned.
438		//
439		// The function will fail if the size of the output would equal or exceed
440		// \|max_len\|.
441		static int bio_read_all(BIO bio, uint8_t out, size_t out_len,
442		const uint8_t *prefix, size_t prefix_len,
443	0	size_t max_len) {
444	0	static const size_t kChunkSize = 4096;
445
446	0	size_t len = prefix_len + kChunkSize;
447	0	if (len > max_len) {
448	0	len = max_len;
449	0	}
450	0	if (len < prefix_len) {
451	0	return 0;
452	0	}
453	0	*out = OPENSSL_malloc(len);
454	0	if (*out == NULL) {
455	0	return 0;
456	0	}
457	0	OPENSSL_memcpy(*out, prefix, prefix_len);
458	0	size_t done = prefix_len;
459
460	0	for (;;) {
461	0	if (done == len) {
462	0	OPENSSL_free(*out);
463	0	return 0;
464	0	}
465	0	size_t todo = len - done;
466	0	if (todo > INT_MAX) {
467	0	todo = INT_MAX;
468	0	}
469	0	const int n = BIO_read(bio, *out + done, (int)todo);
470	0	if (n == 0) {
471	0	*out_len = done;
472	0	return 1;
473	0	} else if (n == -1) {
474	0	OPENSSL_free(*out);
475	0	return 0;
476	0	}
477
478	0	done += n;
479	0	if (len < max_len && len - done < kChunkSize / 2) {
480	0	len += kChunkSize;
481	0	if (len < kChunkSize \|\| len > max_len) {
482	0	len = max_len;
483	0	}
484	0	uint8_t new_buf = OPENSSL_realloc(out, len);
485	0	if (new_buf == NULL) {
486	0	OPENSSL_free(*out);
487	0	return 0;
488	0	}
489	0	*out = new_buf;
490	0	}
491	0	}
492	0	}
493
494		// bio_read_full reads \|len\| bytes \|bio\| and writes them into \|out\|. It
495		// tolerates partial reads from \|bio\| and returns one on success or zero if a
496		// read fails before \|len\| bytes are read. On failure, it additionally sets
497		// \|*out_eof_on_first_read\| to whether the error was due to \|bio\| returning zero
498		// on the first read. \|out_eof_on_first_read\| may be NULL to discard the value.
499		static int bio_read_full(BIO bio, uint8_t out, int *out_eof_on_first_read,
500	0	size_t len) {
501	0	int first_read = 1;
502	0	while (len > 0) {
503	0	int todo = len <= INT_MAX ? (int)len : INT_MAX;
504	0	int ret = BIO_read(bio, out, todo);
505	0	if (ret <= 0) {
506	0	if (out_eof_on_first_read != NULL) {
507	0	*out_eof_on_first_read = first_read && ret == 0;
508	0	}
509	0	return 0;
510	0	}
511	0	out += ret;
512	0	len -= (size_t)ret;
513	0	first_read = 0;
514	0	}
515
516	0	return 1;
517	0	}
518
519		// For compatibility with existing \|d2i_*_bio\| callers, \|BIO_read_asn1\| uses
520		// \|ERR_LIB_ASN1\| errors.
521		OPENSSL_DECLARE_ERROR_REASON(ASN1, ASN1_R_DECODE_ERROR)
522		OPENSSL_DECLARE_ERROR_REASON(ASN1, ASN1_R_HEADER_TOO_LONG)
523		OPENSSL_DECLARE_ERROR_REASON(ASN1, ASN1_R_NOT_ENOUGH_DATA)
524		OPENSSL_DECLARE_ERROR_REASON(ASN1, ASN1_R_TOO_LONG)
525
526	0	int BIO_read_asn1(BIO bio, uint8_t out, size_t out_len, size_t max_len) {
527	0	uint8_t header[6];
528
529	0	static const size_t kInitialHeaderLen = 2;
530	0	int eof_on_first_read;
531	0	if (!bio_read_full(bio, header, &eof_on_first_read, kInitialHeaderLen)) {
532	0	if (eof_on_first_read) {
533		// Historically, OpenSSL returned \|ASN1_R_HEADER_TOO_LONG\| when
534		// \|d2i_*_bio\| could not read anything. CPython conditions on this to
535		// determine if \|bio\| was empty.
536	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_HEADER_TOO_LONG);
537	0	} else {
538	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_NOT_ENOUGH_DATA);
539	0	}
540	0	return 0;
541	0	}
542
543	0	const uint8_t tag = header[0];
544	0	const uint8_t length_byte = header[1];
545
546	0	if ((tag & 0x1f) == 0x1f) {
547		// Long form tags are not supported.
548	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_DECODE_ERROR);
549	0	return 0;
550	0	}
551
552	0	size_t len, header_len;
553	0	if ((length_byte & 0x80) == 0) {
554		// Short form length.
555	0	len = length_byte;
556	0	header_len = kInitialHeaderLen;
557	0	} else {
558	0	const size_t num_bytes = length_byte & 0x7f;
559
560	0	if ((tag & 0x20 /* constructed */) != 0 && num_bytes == 0) {
561		// indefinite length.
562	0	if (!bio_read_all(bio, out, out_len, header, kInitialHeaderLen,
563	0	max_len)) {
564	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_NOT_ENOUGH_DATA);
565	0	return 0;
566	0	}
567	0	return 1;
568	0	}
569
570	0	if (num_bytes == 0 \|\| num_bytes > 4) {
571	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_DECODE_ERROR);
572	0	return 0;
573	0	}
574
575	0	if (!bio_read_full(bio, header + kInitialHeaderLen, NULL, num_bytes)) {
576	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_NOT_ENOUGH_DATA);
577	0	return 0;
578	0	}
579	0	header_len = kInitialHeaderLen + num_bytes;
580
581	0	uint32_t len32 = 0;
582	0	for (unsigned i = 0; i < num_bytes; i++) {
583	0	len32 <<= 8;
584	0	len32 \|= header[kInitialHeaderLen + i];
585	0	}
586
587	0	if (len32 < 128) {
588		// Length should have used short-form encoding.
589	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_DECODE_ERROR);
590	0	return 0;
591	0	}
592
593	0	if ((len32 >> ((num_bytes-1)*8)) == 0) {
594		// Length should have been at least one byte shorter.
595	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_DECODE_ERROR);
596	0	return 0;
597	0	}
598
599	0	len = len32;
600	0	}
601
602	0	if (len + header_len < len \|\|
603	0	len + header_len > max_len \|\|
604	0	len > INT_MAX) {
605	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_TOO_LONG);
606	0	return 0;
607	0	}
608	0	len += header_len;
609	0	*out_len = len;
610
611	0	*out = OPENSSL_malloc(len);
612	0	if (*out == NULL) {
613	0	return 0;
614	0	}
615	0	OPENSSL_memcpy(*out, header, header_len);
616	0	if (!bio_read_full(bio, (*out) + header_len, NULL, len - header_len)) {
617	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_NOT_ENOUGH_DATA);
618	0	OPENSSL_free(*out);
619	0	return 0;
620	0	}
621
622	0	return 1;
623	0	}
624
625	0	void BIO_set_retry_special(BIO *bio) {
626	0	bio->flags \|= BIO_FLAGS_READ \| BIO_FLAGS_IO_SPECIAL;
627	0	}
628
629	0	int BIO_set_write_buffer_size(BIO *bio, int buffer_size) { return 0; }
630
631		static struct CRYPTO_STATIC_MUTEX g_index_lock = CRYPTO_STATIC_MUTEX_INIT;
632		static int g_index = BIO_TYPE_START;
633
634	0	int BIO_get_new_index(void) {
635	0	CRYPTO_STATIC_MUTEX_lock_write(&g_index_lock);
636		// If \|g_index\| exceeds 255, it will collide with the flags bits.
637	0	int ret = g_index > 255 ? -1 : g_index++;
638	0	CRYPTO_STATIC_MUTEX_unlock_write(&g_index_lock);
639	0	return ret;
640	0	}
641
642	0	BIO_METHOD BIO_meth_new(int type, const char name) {
643	0	BIO_METHOD *method = OPENSSL_malloc(sizeof(BIO_METHOD));
644	0	if (method == NULL) {
645	0	return NULL;
646	0	}
647	0	OPENSSL_memset(method, 0, sizeof(BIO_METHOD));
648	0	method->type = type;
649	0	method->name = name;
650	0	return method;
651	0	}
652
653	0	void BIO_meth_free(BIO_METHOD *method) {
654	0	OPENSSL_free(method);
655	0	}
656
657		int BIO_meth_set_create(BIO_METHOD *method,
658	0	int (create)(BIO )) {
659	0	method->create = create;
660	0	return 1;
661	0	}
662
663		int BIO_meth_set_destroy(BIO_METHOD *method,
664	0	int (destroy)(BIO )) {
665	0	method->destroy = destroy;
666	0	return 1;
667	0	}
668
669		int BIO_meth_set_write(BIO_METHOD *method,
670	0	int (write)(BIO , const char *, int)) {
671	0	method->bwrite = write;
672	0	return 1;
673	0	}
674
675		int BIO_meth_set_read(BIO_METHOD *method,
676	0	int (read)(BIO , char *, int)) {
677	0	method->bread = read;
678	0	return 1;
679	0	}
680
681		int BIO_meth_set_gets(BIO_METHOD *method,
682	0	int (gets)(BIO , char *, int)) {
683	0	method->bgets = gets;
684	0	return 1;
685	0	}
686
687		int BIO_meth_set_ctrl(BIO_METHOD *method,
688	0	long (ctrl)(BIO , int, long, void *)) {
689	0	method->ctrl = ctrl;
690	0	return 1;
691	0	}
692
693	0	void BIO_set_data(BIO bio, void ptr) { bio->ptr = ptr; }
694
695	0	void BIO_get_data(BIO bio) { return bio->ptr; }
696
697	0	void BIO_set_init(BIO *bio, int init) { bio->init = init; }
698
699	0	int BIO_get_init(BIO *bio) { return bio->init; }
700
701	0	void BIO_set_shutdown(BIO *bio, int shutdown) { bio->shutdown = shutdown; }
702
703	0	int BIO_get_shutdown(BIO *bio) { return bio->shutdown; }
704
705	0	int BIO_meth_set_puts(BIO_METHOD method, int (puts)(BIO , const char )) {
706		// Ignore the parameter. We implement \|BIO_puts\| using \|BIO_write\|.
707	0	return 1;
708	0	}