packeted_bio.h

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/* Copyright (c) 2014, Google Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */

#ifndef HEADER_PACKETED_BIO
#define HEADER_PACKETED_BIO

#include <openssl/base.h>
#include <openssl/bio.h>

#if defined(OPENSSL_WINDOWS)
OPENSSL_MSVC_PRAGMA(warning(push, 3))
#include <winsock2.h>
OPENSSL_MSVC_PRAGMA(warning(pop))
#else
#include <sys/time.h>
#endif


// PacketedBioCreate creates a filter BIO which implements a reliable in-order
// blocking datagram socket. It internally maintains a clock and honors
// |BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT| based on it.
//
// During a |BIO_read|, the peer may signal the filter BIO to simulate a
// timeout. If |advance_clock| is true, it automatically advances the clock and
// continues reading, subject to the read deadline. Otherwise, it fails
// immediately. The caller must then call |PacketedBioAdvanceClock| before
// retrying |BIO_read|.
bssl::UniquePtr<BIO> PacketedBioCreate(bool advance_clock);

// PacketedBioGetClock returns the current time for |bio|.
timeval PacketedBioGetClock(const BIO *bio);

// PacketedBioAdvanceClock advances |bio|'s internal clock and returns true if
// there is a pending timeout. Otherwise, it returns false.
bool PacketedBioAdvanceClock(BIO *bio);


#endif  // HEADER_PACKETED_BIO