--- /dev/null
+/* 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/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) {
+ OPENSSL_PUT_ERROR(BIO, ERR_R_MALLOC_FAILURE);
+ 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_puts(BIO *bio, const char *in) {
+ return BIO_write(bio, in, strlen(in));
+}
+
+int BIO_flush(BIO *bio) {
+ return 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 BIO_ctrl(bio, BIO_CTRL_RESET, 0, NULL);
+}
+
+int BIO_eof(BIO *bio) {
+ return 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_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 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((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;
+ }
+ const size_t todo = len - done;
+ assert(todo < INT_MAX);
+ const int n = BIO_read(bio, *out + done, 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;
+ }
+ }
+}
+
+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;
+ if (BIO_read(bio, header, kInitialHeaderLen) != (int) kInitialHeaderLen) {
+ 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.
+ 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.
+ return bio_read_all(bio, out, out_len, header, kInitialHeaderLen,
+ max_len);
+ }
+
+ if (num_bytes == 0 || num_bytes > 4) {
+ return 0;
+ }
+
+ if (BIO_read(bio, header + kInitialHeaderLen, num_bytes) !=
+ (int)num_bytes) {
+ return 0;
+ }
+ header_len = kInitialHeaderLen + num_bytes;
+
+ uint32_t len32 = 0;
+ unsigned i;
+ for (i = 0; i < num_bytes; i++) {
+ len32 <<= 8;
+ len32 |= header[kInitialHeaderLen + i];
+ }
+
+ if (len32 < 128) {
+ // Length should have used short-form encoding.
+ return 0;
+ }
+
+ if ((len32 >> ((num_bytes-1)*8)) == 0) {
+ // Length should have been at least one byte shorter.
+ return 0;
+ }
+
+ len = len32;
+ }
+
+ if (len + header_len < len ||
+ len + header_len > max_len ||
+ len > INT_MAX) {
+ 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(bio, (*out) + header_len, len - header_len) !=
+ (int) (len - header_len)) {
+ 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;
+}
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