diff --git a/crypto/bio/internal.h b/crypto/bio/internal.h
new file mode 100644
index 0000000..d498708
--- /dev/null
+++ b/crypto/bio/internal.h
@@ -0,0 +1,102 @@
+/* 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.] */
+
+#ifndef OPENSSL_HEADER_BIO_INTERNAL_H
+#define OPENSSL_HEADER_BIO_INTERNAL_H
+
+#include <openssl/base.h>
+
+#if !defined(OPENSSL_WINDOWS)
+#include <sys/socket.h>
+#else
+#include <WinSock2.h>
+#endif
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+
+/* BIO_ip_and_port_to_socket_and_addr creates a socket and fills in |*out_addr|
+ * with the correct values for connecting to |hostname| on |port_str|. It
+ * returns one on success or zero on error. */
+int bio_ip_and_port_to_socket_and_addr(int *out_sock,
+                                       struct sockaddr_storage *out_addr,
+                                       const char *hostname,
+                                       const char *port_str);
+
+/* BIO_socket_nbio sets whether |sock| is non-blocking. It returns one on
+ * success and zero otherwise. */
+int bio_socket_nbio(int sock, int on);
+
+/* BIO_clear_socket_error clears the last system socket error.
+ *
+ * TODO(fork): remove all callers of this. */
+void bio_clear_socket_error();
+
+/* BIO_sock_error returns the last socket error on |sock|. */
+int bio_sock_error(int sock);
+
+/* BIO_fd_should_retry returns non-zero if |return_value| indicates an error
+ * and |errno| indicates that it's non-fatal. */
+int bio_fd_should_retry(int return_value);
+
+
+#if defined(__cplusplus)
+}  /* extern C */
+#endif
+
+#endif  /* OPENSSL_HEADER_BIO_INTERNAL_H */