/*
* Copyright (c) 2009-2012 Niels Provos and Nick Mathewson
*
* 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 above 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
*/
#ifndef EVENT2_BUFFEREVENT_SSL_H_INCLUDED_
#define EVENT2_BUFFEREVENT_SSL_H_INCLUDED_
/** @file event2/bufferevent_ssl.h
OpenSSL support for bufferevents.
*/
#include <event2/visibility.h>
#include <event2/event-config.h>
#include <event2/bufferevent.h>
#include <event2/util.h>
#ifdef __cplusplus
extern "C" {
#endif
/* This is what openssl's SSL objects are underneath. */
struct ssl_st;
/**
The state of an SSL object to be used when creating a new
SSL bufferevent.
*/
enum bufferevent_ssl_state {
BUFFEREVENT_SSL_OPEN = 0,
BUFFEREVENT_SSL_CONNECTING = 1,
BUFFEREVENT_SSL_ACCEPTING = 2
};
#if defined(EVENT__HAVE_OPENSSL) || defined(EVENT_IN_DOXYGEN_)
/**
Create a new SSL bufferevent to send its data over another bufferevent.
@param base An event_base to use to detect reading and writing. It
must also be the base for the underlying bufferevent.
@param underlying A socket to use for this SSL
@param ssl A SSL* object from openssl.
@param state The current state of the SSL connection
@param options One or more bufferevent_options
@return A new bufferevent on success, or NULL on failure
*/
EVENT2_EXPORT_SYMBOL
struct bufferevent *
bufferevent_openssl_filter_new(struct event_base *base,
struct bufferevent *underlying,
struct ssl_st *ssl,
enum bufferevent_ssl_state state,
int options);
/**
Create a new SSL bufferevent to send its data over an SSL * on a socket.
@param base An event_base to use to detect reading and writing
@param fd A socket to use for this SSL
@param ssl A SSL* object from openssl.
@param state The current state of the SSL connection
@param options One or more bufferevent_options
@return A new bufferevent on success, or NULL on failure.
*/
EVENT2_EXPORT_SYMBOL
struct bufferevent *
bufferevent_openssl_socket_new(struct event_base *base,
evutil_socket_t fd,
struct ssl_st *ssl,
enum bufferevent_ssl_state state,
int options);
/** Control how to report dirty SSL shutdowns.
If the peer (or the network, or an attacker) closes the TCP
connection before closing the SSL channel, and the protocol is SSL >= v3,
this is a "dirty" shutdown. If allow_dirty_shutdown is 0 (default),
this is reported as BEV_EVENT_ERROR.
If instead allow_dirty_shutdown=1, a dirty shutdown is reported as
BEV_EVENT_EOF.
(Note that if the protocol is < SSLv3, you will always receive
BEV_EVENT_EOF, since SSL 2 and earlier cannot distinguish a secure
connection close from a dirty one. This is one reason (among many)
not to use SSL 2.)
*/
EVENT2_EXPORT_SYMBOL
int bufferevent_openssl_get_allow_dirty_shutdown(struct bufferevent *bev);
EVENT2_EXPORT_SYMBOL
void bufferevent_openssl_set_allow_dirty_shutdown(struct bufferevent *bev,
int allow_dirty_shutdown);
/** Return the underlying openssl SSL * object for an SSL bufferevent. */
EVENT2_EXPORT_SYMBOL
struct ssl_st *
bufferevent_openssl_get_ssl(struct bufferevent *bufev);
/** Tells a bufferevent to begin SSL renegotiation. */
EVENT2_EXPORT_SYMBOL
int bufferevent_ssl_renegotiate(struct bufferevent *bev);
/** Return the most recent OpenSSL error reported on an SSL bufferevent. */
EVENT2_EXPORT_SYMBOL
unsigned long bufferevent_get_openssl_error(struct bufferevent *bev);
#endif
#ifdef __cplusplus
}
#endif
#endif /* EVENT2_BUFFEREVENT_SSL_H_INCLUDED_ */
