/src/boringssl/crypto/bio/bio.cc

Source (jump to first uncovered line)
// Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#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 "../internal.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 = reinterpret_cast<BIO *>(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->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, reinterpret_cast<char *>(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, reinterpret_cast<const char *>(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 = reinterpret_cast<const uint8_t *>(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 = reinterpret_cast<uint8_t *>(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 =
          reinterpret_cast<uint8_t *>(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 = reinterpret_cast<uint8_t *>(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 =
      reinterpret_cast<BIO_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;
}

int BIO_meth_set_callback_ctrl(BIO_METHOD *method,
                               long (*callback_ctrl_func)(BIO *, int,
                                                          BIO_info_cb *)) {
  method->callback_ctrl = callback_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: 2025-06-11 06:40

Line	Count	Source (jump to first uncovered line)
1		// Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
2		//
3		// Licensed under the Apache License, Version 2.0 (the "License");
4		// you may not use this file except in compliance with the License.
5		// You may obtain a copy of the License at
6		//
7		// https://www.apache.org/licenses/LICENSE-2.0
8		//
9		// Unless required by applicable law or agreed to in writing, software
10		// distributed under the License is distributed on an "AS IS" BASIS,
11		// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12		// See the License for the specific language governing permissions and
13		// limitations under the License.
14
15		#include <openssl/bio.h>
16
17		#include <assert.h>
18		#include <errno.h>
19		#include <limits.h>
20		#include <string.h>
21
22		#include <openssl/asn1.h>
23		#include <openssl/err.h>
24		#include <openssl/mem.h>
25
26		#include "../internal.h"
27		#include "internal.h"
28
29
30		static CRYPTO_EX_DATA_CLASS g_ex_data_class =
31		CRYPTO_EX_DATA_CLASS_INIT_WITH_APP_DATA;
32
33	0	BIO BIO_new(const BIO_METHOD method) {
34	0	BIO ret = reinterpret_cast<BIO >(OPENSSL_zalloc(sizeof(BIO)));
35	0	if (ret == NULL) {
36	0	return NULL;
37	0	}
38
39	0	ret->method = method;
40	0	ret->shutdown = 1;
41	0	ret->references = 1;
42	0	CRYPTO_new_ex_data(&ret->ex_data);
43
44	0	if (method->create != NULL && !method->create(ret)) {
45	0	OPENSSL_free(ret);
46	0	return NULL;
47	0	}
48
49	0	return ret;
50	0	}
51
52	0	int BIO_free(BIO *bio) {
53	0	BIO *next_bio;
54
55	0	for (; bio != NULL; bio = next_bio) {
56	0	if (!CRYPTO_refcount_dec_and_test_zero(&bio->references)) {
57	0	return 0;
58	0	}
59
60	0	next_bio = BIO_pop(bio);
61
62	0	if (bio->method != NULL && bio->method->destroy != NULL) {
63	0	bio->method->destroy(bio);
64	0	}
65
66	0	CRYPTO_free_ex_data(&g_ex_data_class, &bio->ex_data);
67	0	OPENSSL_free(bio);
68	0	}
69	0	return 1;
70	0	}
71
72	0	int BIO_up_ref(BIO *bio) {
73	0	CRYPTO_refcount_inc(&bio->references);
74	0	return 1;
75	0	}
76
77	0	void BIO_vfree(BIO *bio) { BIO_free(bio); }
78
79	0	void BIO_free_all(BIO *bio) { BIO_free(bio); }
80
81	0	int BIO_read(BIO bio, void buf, int len) {
82	0	if (bio == NULL \|\| bio->method == NULL \|\| bio->method->bread == NULL) {
83	0	OPENSSL_PUT_ERROR(BIO, BIO_R_UNSUPPORTED_METHOD);
84	0	return -2;
85	0	}
86	0	if (!bio->init) {
87	0	OPENSSL_PUT_ERROR(BIO, BIO_R_UNINITIALIZED);
88	0	return -2;
89	0	}
90	0	if (len <= 0) {
91	0	return 0;
92	0	}
93	0	int ret = bio->method->bread(bio, reinterpret_cast<char *>(buf), len);
94	0	if (ret > 0) {
95	0	bio->num_read += ret;
96	0	}
97	0	return ret;
98	0	}
99
100	0	int BIO_gets(BIO bio, char buf, int len) {
101	0	if (bio == NULL \|\| bio->method == NULL \|\| bio->method->bgets == NULL) {
102	0	OPENSSL_PUT_ERROR(BIO, BIO_R_UNSUPPORTED_METHOD);
103	0	return -2;
104	0	}
105	0	if (!bio->init) {
106	0	OPENSSL_PUT_ERROR(BIO, BIO_R_UNINITIALIZED);
107	0	return -2;
108	0	}
109	0	if (len <= 0) {
110	0	return 0;
111	0	}
112	0	int ret = bio->method->bgets(bio, buf, len);
113	0	if (ret > 0) {
114	0	bio->num_read += ret;
115	0	}
116	0	return ret;
117	0	}
118
119	0	int BIO_write(BIO bio, const void in, int inl) {
120	0	if (bio == NULL \|\| bio->method == NULL \|\| bio->method->bwrite == NULL) {
121	0	OPENSSL_PUT_ERROR(BIO, BIO_R_UNSUPPORTED_METHOD);
122	0	return -2;
123	0	}
124	0	if (!bio->init) {
125	0	OPENSSL_PUT_ERROR(BIO, BIO_R_UNINITIALIZED);
126	0	return -2;
127	0	}
128	0	if (inl <= 0) {
129	0	return 0;
130	0	}
131	0	int ret = bio->method->bwrite(bio, reinterpret_cast<const char *>(in), inl);
132	0	if (ret > 0) {
133	0	bio->num_write += ret;
134	0	}
135	0	return ret;
136	0	}
137
138	0	int BIO_write_all(BIO bio, const void data, size_t len) {
139	0	const uint8_t data_u8 = reinterpret_cast<const uint8_t >(data);
140	0	while (len > 0) {
141	0	int ret = BIO_write(bio, data_u8, len > INT_MAX ? INT_MAX : (int)len);
142	0	if (ret <= 0) {
143	0	return 0;
144	0	}
145	0	data_u8 += ret;
146	0	len -= ret;
147	0	}
148	0	return 1;
149	0	}
150
151	0	int BIO_puts(BIO bio, const char in) {
152	0	size_t len = strlen(in);
153	0	if (len > INT_MAX) {
154		// \|BIO_write\| and the return value both assume the string fits in \|int\|.
155	0	OPENSSL_PUT_ERROR(BIO, ERR_R_OVERFLOW);
156	0	return -1;
157	0	}
158	0	return BIO_write(bio, in, (int)len);
159	0	}
160
161	0	int BIO_flush(BIO *bio) { return (int)BIO_ctrl(bio, BIO_CTRL_FLUSH, 0, NULL); }
162
163	0	long BIO_ctrl(BIO bio, int cmd, long larg, void parg) {
164	0	if (bio == NULL) {
165	0	return 0;
166	0	}
167
168	0	if (bio->method == NULL \|\| bio->method->ctrl == NULL) {
169	0	OPENSSL_PUT_ERROR(BIO, BIO_R_UNSUPPORTED_METHOD);
170	0	return -2;
171	0	}
172
173	0	return bio->method->ctrl(bio, cmd, larg, parg);
174	0	}
175
176	0	char BIO_ptr_ctrl(BIO b, int cmd, long larg) {
177	0	char *p = NULL;
178
179	0	if (BIO_ctrl(b, cmd, larg, (void *)&p) <= 0) {
180	0	return NULL;
181	0	}
182
183	0	return p;
184	0	}
185
186	0	long BIO_int_ctrl(BIO *b, int cmd, long larg, int iarg) {
187	0	int i = iarg;
188
189	0	return BIO_ctrl(b, cmd, larg, (void *)&i);
190	0	}
191
192	0	int BIO_reset(BIO *bio) { return (int)BIO_ctrl(bio, BIO_CTRL_RESET, 0, NULL); }
193
194	0	int BIO_eof(BIO *bio) { return (int)BIO_ctrl(bio, BIO_CTRL_EOF, 0, NULL); }
195
196	0	void BIO_set_flags(BIO *bio, int flags) { bio->flags \|= flags; }
197
198	0	int BIO_test_flags(const BIO *bio, int flags) { return bio->flags & flags; }
199
200	0	int BIO_should_read(const BIO *bio) {
201	0	return BIO_test_flags(bio, BIO_FLAGS_READ);
202	0	}
203
204	0	int BIO_should_write(const BIO *bio) {
205	0	return BIO_test_flags(bio, BIO_FLAGS_WRITE);
206	0	}
207
208	0	int BIO_should_retry(const BIO *bio) {
209	0	return BIO_test_flags(bio, BIO_FLAGS_SHOULD_RETRY);
210	0	}
211
212	0	int BIO_should_io_special(const BIO *bio) {
213	0	return BIO_test_flags(bio, BIO_FLAGS_IO_SPECIAL);
214	0	}
215
216	0	int BIO_get_retry_reason(const BIO *bio) { return bio->retry_reason; }
217
218	0	void BIO_set_retry_reason(BIO *bio, int reason) { bio->retry_reason = reason; }
219
220	0	void BIO_clear_flags(BIO *bio, int flags) { bio->flags &= ~flags; }
221
222	0	void BIO_set_retry_read(BIO *bio) {
223	0	bio->flags \|= BIO_FLAGS_READ \| BIO_FLAGS_SHOULD_RETRY;
224	0	}
225
226	0	void BIO_set_retry_write(BIO *bio) {
227	0	bio->flags \|= BIO_FLAGS_WRITE \| BIO_FLAGS_SHOULD_RETRY;
228	0	}
229
230		static const int kRetryFlags = BIO_FLAGS_RWS \| BIO_FLAGS_SHOULD_RETRY;
231
232	0	int BIO_get_retry_flags(BIO *bio) { return bio->flags & kRetryFlags; }
233
234	0	void BIO_clear_retry_flags(BIO *bio) {
235	0	bio->flags &= ~kRetryFlags;
236	0	bio->retry_reason = 0;
237	0	}
238
239	0	int BIO_method_type(const BIO *bio) { return bio->method->type; }
240
241	0	void BIO_copy_next_retry(BIO *bio) {
242	0	BIO_clear_retry_flags(bio);
243	0	BIO_set_flags(bio, BIO_get_retry_flags(bio->next_bio));
244	0	bio->retry_reason = bio->next_bio->retry_reason;
245	0	}
246
247	0	long BIO_callback_ctrl(BIO bio, int cmd, BIO_info_cb fp) {
248	0	if (bio == NULL) {
249	0	return 0;
250	0	}
251
252	0	if (bio->method == NULL \|\| bio->method->callback_ctrl == NULL) {
253	0	OPENSSL_PUT_ERROR(BIO, BIO_R_UNSUPPORTED_METHOD);
254	0	return 0;
255	0	}
256
257	0	return bio->method->callback_ctrl(bio, cmd, fp);
258	0	}
259
260	0	size_t BIO_pending(const BIO *bio) {
261	0	const long r = BIO_ctrl((BIO *)bio, BIO_CTRL_PENDING, 0, NULL);
262	0	assert(r >= 0);
263
264	0	if (r < 0) {
265	0	return 0;
266	0	}
267	0	return r;
268	0	}
269
270	0	size_t BIO_ctrl_pending(const BIO *bio) { return BIO_pending(bio); }
271
272	0	size_t BIO_wpending(const BIO *bio) {
273	0	const long r = BIO_ctrl((BIO *)bio, BIO_CTRL_WPENDING, 0, NULL);
274	0	assert(r >= 0);
275
276	0	if (r < 0) {
277	0	return 0;
278	0	}
279	0	return r;
280	0	}
281
282	0	int BIO_set_close(BIO *bio, int close_flag) {
283	0	return (int)BIO_ctrl(bio, BIO_CTRL_SET_CLOSE, close_flag, NULL);
284	0	}
285
286	0	OPENSSL_EXPORT uint64_t BIO_number_read(const BIO *bio) {
287	0	return bio->num_read;
288	0	}
289
290	0	OPENSSL_EXPORT uint64_t BIO_number_written(const BIO *bio) {
291	0	return bio->num_write;
292	0	}
293
294	0	BIO BIO_push(BIO bio, BIO *appended_bio) {
295	0	BIO *last_bio;
296
297	0	if (bio == NULL) {
298	0	return bio;
299	0	}
300
301	0	last_bio = bio;
302	0	while (last_bio->next_bio != NULL) {
303	0	last_bio = last_bio->next_bio;
304	0	}
305
306	0	last_bio->next_bio = appended_bio;
307	0	return bio;
308	0	}
309
310	0	BIO BIO_pop(BIO bio) {
311	0	BIO *ret;
312
313	0	if (bio == NULL) {
314	0	return NULL;
315	0	}
316	0	ret = bio->next_bio;
317	0	bio->next_bio = NULL;
318	0	return ret;
319	0	}
320
321	0	BIO BIO_next(BIO bio) {
322	0	if (!bio) {
323	0	return NULL;
324	0	}
325	0	return bio->next_bio;
326	0	}
327
328	0	BIO BIO_find_type(BIO bio, int type) {
329	0	int method_type, mask;
330
331	0	if (!bio) {
332	0	return NULL;
333	0	}
334	0	mask = type & 0xff;
335
336	0	do {
337	0	if (bio->method != NULL) {
338	0	method_type = bio->method->type;
339
340	0	if (!mask) {
341	0	if (method_type & type) {
342	0	return bio;
343	0	}
344	0	} else if (method_type == type) {
345	0	return bio;
346	0	}
347	0	}
348	0	bio = bio->next_bio;
349	0	} while (bio != NULL);
350
351	0	return NULL;
352	0	}
353
354	0	int BIO_indent(BIO *bio, unsigned indent, unsigned max_indent) {
355	0	if (indent > max_indent) {
356	0	indent = max_indent;
357	0	}
358
359	0	while (indent--) {
360	0	if (BIO_puts(bio, " ") != 1) {
361	0	return 0;
362	0	}
363	0	}
364	0	return 1;
365	0	}
366
367	0	static int print_bio(const char str, size_t len, void bio) {
368	0	return BIO_write_all((BIO *)bio, str, len);
369	0	}
370
371	0	void ERR_print_errors(BIO *bio) { ERR_print_errors_cb(print_bio, bio); }
372
373		// bio_read_all reads everything from \|bio\| and prepends \|prefix\| to it. On
374		// success, \|*out\| is set to an allocated buffer (which should be freed with
375		// \|OPENSSL_free\|), \|*out_len\| is set to its length and one is returned. The
376		// buffer will contain \|prefix\| followed by the contents of \|bio\|. On failure,
377		// zero is returned.
378		//
379		// The function will fail if the size of the output would equal or exceed
380		// \|max_len\|.
381		static int bio_read_all(BIO bio, uint8_t out, size_t out_len,
382		const uint8_t *prefix, size_t prefix_len,
383	0	size_t max_len) {
384	0	static const size_t kChunkSize = 4096;
385
386	0	size_t len = prefix_len + kChunkSize;
387	0	if (len > max_len) {
388	0	len = max_len;
389	0	}
390	0	if (len < prefix_len) {
391	0	return 0;
392	0	}
393	0	out = reinterpret_cast<uint8_t >(OPENSSL_malloc(len));
394	0	if (*out == NULL) {
395	0	return 0;
396	0	}
397	0	OPENSSL_memcpy(*out, prefix, prefix_len);
398	0	size_t done = prefix_len;
399
400	0	for (;;) {
401	0	if (done == len) {
402	0	OPENSSL_free(*out);
403	0	return 0;
404	0	}
405	0	size_t todo = len - done;
406	0	if (todo > INT_MAX) {
407	0	todo = INT_MAX;
408	0	}
409	0	const int n = BIO_read(bio, *out + done, (int)todo);
410	0	if (n == 0) {
411	0	*out_len = done;
412	0	return 1;
413	0	} else if (n == -1) {
414	0	OPENSSL_free(*out);
415	0	return 0;
416	0	}
417
418	0	done += n;
419	0	if (len < max_len && len - done < kChunkSize / 2) {
420	0	len += kChunkSize;
421	0	if (len < kChunkSize \|\| len > max_len) {
422	0	len = max_len;
423	0	}
424	0	uint8_t *new_buf =
425	0	reinterpret_cast<uint8_t >(OPENSSL_realloc(out, len));
426	0	if (new_buf == NULL) {
427	0	OPENSSL_free(*out);
428	0	return 0;
429	0	}
430	0	*out = new_buf;
431	0	}
432	0	}
433	0	}
434
435		// bio_read_full reads \|len\| bytes \|bio\| and writes them into \|out\|. It
436		// tolerates partial reads from \|bio\| and returns one on success or zero if a
437		// read fails before \|len\| bytes are read. On failure, it additionally sets
438		// \|*out_eof_on_first_read\| to whether the error was due to \|bio\| returning zero
439		// on the first read. \|out_eof_on_first_read\| may be NULL to discard the value.
440		static int bio_read_full(BIO bio, uint8_t out, int *out_eof_on_first_read,
441	0	size_t len) {
442	0	int first_read = 1;
443	0	while (len > 0) {
444	0	int todo = len <= INT_MAX ? (int)len : INT_MAX;
445	0	int ret = BIO_read(bio, out, todo);
446	0	if (ret <= 0) {
447	0	if (out_eof_on_first_read != NULL) {
448	0	*out_eof_on_first_read = first_read && ret == 0;
449	0	}
450	0	return 0;
451	0	}
452	0	out += ret;
453	0	len -= (size_t)ret;
454	0	first_read = 0;
455	0	}
456
457	0	return 1;
458	0	}
459
460		// For compatibility with existing \|d2i_*_bio\| callers, \|BIO_read_asn1\| uses
461		// \|ERR_LIB_ASN1\| errors.
462		OPENSSL_DECLARE_ERROR_REASON(ASN1, ASN1_R_DECODE_ERROR)
463		OPENSSL_DECLARE_ERROR_REASON(ASN1, ASN1_R_HEADER_TOO_LONG)
464		OPENSSL_DECLARE_ERROR_REASON(ASN1, ASN1_R_NOT_ENOUGH_DATA)
465		OPENSSL_DECLARE_ERROR_REASON(ASN1, ASN1_R_TOO_LONG)
466
467	0	int BIO_read_asn1(BIO bio, uint8_t out, size_t out_len, size_t max_len) {
468	0	uint8_t header[6];
469
470	0	static const size_t kInitialHeaderLen = 2;
471	0	int eof_on_first_read;
472	0	if (!bio_read_full(bio, header, &eof_on_first_read, kInitialHeaderLen)) {
473	0	if (eof_on_first_read) {
474		// Historically, OpenSSL returned \|ASN1_R_HEADER_TOO_LONG\| when
475		// \|d2i_*_bio\| could not read anything. CPython conditions on this to
476		// determine if \|bio\| was empty.
477	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_HEADER_TOO_LONG);
478	0	} else {
479	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_NOT_ENOUGH_DATA);
480	0	}
481	0	return 0;
482	0	}
483
484	0	const uint8_t tag = header[0];
485	0	const uint8_t length_byte = header[1];
486
487	0	if ((tag & 0x1f) == 0x1f) {
488		// Long form tags are not supported.
489	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_DECODE_ERROR);
490	0	return 0;
491	0	}
492
493	0	size_t len, header_len;
494	0	if ((length_byte & 0x80) == 0) {
495		// Short form length.
496	0	len = length_byte;
497	0	header_len = kInitialHeaderLen;
498	0	} else {
499	0	const size_t num_bytes = length_byte & 0x7f;
500
501	0	if ((tag & 0x20 /* constructed */) != 0 && num_bytes == 0) {
502		// indefinite length.
503	0	if (!bio_read_all(bio, out, out_len, header, kInitialHeaderLen,
504	0	max_len)) {
505	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_NOT_ENOUGH_DATA);
506	0	return 0;
507	0	}
508	0	return 1;
509	0	}
510
511	0	if (num_bytes == 0 \|\| num_bytes > 4) {
512	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_DECODE_ERROR);
513	0	return 0;
514	0	}
515
516	0	if (!bio_read_full(bio, header + kInitialHeaderLen, NULL, num_bytes)) {
517	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_NOT_ENOUGH_DATA);
518	0	return 0;
519	0	}
520	0	header_len = kInitialHeaderLen + num_bytes;
521
522	0	uint32_t len32 = 0;
523	0	for (unsigned i = 0; i < num_bytes; i++) {
524	0	len32 <<= 8;
525	0	len32 \|= header[kInitialHeaderLen + i];
526	0	}
527
528	0	if (len32 < 128) {
529		// Length should have used short-form encoding.
530	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_DECODE_ERROR);
531	0	return 0;
532	0	}
533
534	0	if ((len32 >> ((num_bytes - 1) * 8)) == 0) {
535		// Length should have been at least one byte shorter.
536	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_DECODE_ERROR);
537	0	return 0;
538	0	}
539
540	0	len = len32;
541	0	}
542
543	0	if (len + header_len < len \|\| len + header_len > max_len \|\| len > INT_MAX) {
544	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_TOO_LONG);
545	0	return 0;
546	0	}
547	0	len += header_len;
548	0	*out_len = len;
549
550	0	out = reinterpret_cast<uint8_t >(OPENSSL_malloc(len));
551	0	if (*out == NULL) {
552	0	return 0;
553	0	}
554	0	OPENSSL_memcpy(*out, header, header_len);
555	0	if (!bio_read_full(bio, (*out) + header_len, NULL, len - header_len)) {
556	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_NOT_ENOUGH_DATA);
557	0	OPENSSL_free(*out);
558	0	return 0;
559	0	}
560
561	0	return 1;
562	0	}
563
564	0	void BIO_set_retry_special(BIO *bio) {
565	0	bio->flags \|= BIO_FLAGS_READ \| BIO_FLAGS_IO_SPECIAL;
566	0	}
567
568	0	int BIO_set_write_buffer_size(BIO *bio, int buffer_size) { return 0; }
569
570		static CRYPTO_MUTEX g_index_lock = CRYPTO_MUTEX_INIT;
571		static int g_index = BIO_TYPE_START;
572
573	0	int BIO_get_new_index(void) {
574	0	CRYPTO_MUTEX_lock_write(&g_index_lock);
575		// If \|g_index\| exceeds 255, it will collide with the flags bits.
576	0	int ret = g_index > 255 ? -1 : g_index++;
577	0	CRYPTO_MUTEX_unlock_write(&g_index_lock);
578	0	return ret;
579	0	}
580
581	0	BIO_METHOD BIO_meth_new(int type, const char name) {
582	0	BIO_METHOD *method =
583	0	reinterpret_cast<BIO_METHOD *>(OPENSSL_zalloc(sizeof(BIO_METHOD)));
584	0	if (method == NULL) {
585	0	return NULL;
586	0	}
587	0	method->type = type;
588	0	method->name = name;
589	0	return method;
590	0	}
591
592	0	void BIO_meth_free(BIO_METHOD *method) { OPENSSL_free(method); }
593
594	0	int BIO_meth_set_create(BIO_METHOD method, int (create_func)(BIO *)) {
595	0	method->create = create_func;
596	0	return 1;
597	0	}
598
599	0	int BIO_meth_set_destroy(BIO_METHOD method, int (destroy_func)(BIO *)) {
600	0	method->destroy = destroy_func;
601	0	return 1;
602	0	}
603
604		int BIO_meth_set_write(BIO_METHOD *method,
605	0	int (write_func)(BIO , const char *, int)) {
606	0	method->bwrite = write_func;
607	0	return 1;
608	0	}
609
610		int BIO_meth_set_read(BIO_METHOD *method,
611	0	int (read_func)(BIO , char *, int)) {
612	0	method->bread = read_func;
613	0	return 1;
614	0	}
615
616		int BIO_meth_set_gets(BIO_METHOD *method,
617	0	int (gets_func)(BIO , char *, int)) {
618	0	method->bgets = gets_func;
619	0	return 1;
620	0	}
621
622		int BIO_meth_set_ctrl(BIO_METHOD *method,
623	0	long (ctrl_func)(BIO , int, long, void *)) {
624	0	method->ctrl = ctrl_func;
625	0	return 1;
626	0	}
627
628		int BIO_meth_set_callback_ctrl(BIO_METHOD *method,
629		long (callback_ctrl_func)(BIO , int,
630	0	BIO_info_cb *)) {
631	0	method->callback_ctrl = callback_ctrl_func;
632	0	return 1;
633	0	}
634
635	0	void BIO_set_data(BIO bio, void ptr) { bio->ptr = ptr; }
636
637	0	void BIO_get_data(BIO bio) { return bio->ptr; }
638
639	0	void BIO_set_init(BIO *bio, int init) { bio->init = init; }
640
641	0	int BIO_get_init(BIO *bio) { return bio->init; }
642
643	0	void BIO_set_shutdown(BIO *bio, int shutdown) { bio->shutdown = shutdown; }
644
645	0	int BIO_get_shutdown(BIO *bio) { return bio->shutdown; }
646
647	0	int BIO_meth_set_puts(BIO_METHOD method, int (puts)(BIO , const char )) {
648		// Ignore the parameter. We implement \|BIO_puts\| using \|BIO_write\|.
649	0	return 1;
650	0	}
651
652		int BIO_get_ex_new_index(long argl, void *argp, //
653		CRYPTO_EX_unused *unused, //
654		CRYPTO_EX_dup *dup_unused, //
655	0	CRYPTO_EX_free *free_func) {
656	0	return CRYPTO_get_ex_new_index_ex(&g_ex_data_class, argl, argp, free_func);
657	0	}
658
659	0	int BIO_set_ex_data(BIO bio, int idx, void data) {
660	0	return CRYPTO_set_ex_data(&bio->ex_data, idx, data);
661	0	}
662
663	0	void BIO_get_ex_data(const BIO bio, int idx) {
664	0	return CRYPTO_get_ex_data(&bio->ex_data, idx);
665	0	}