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zhangchengwei
134
cache/include/libevent2/event2/bufferevent_ssl.h
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134
cache/include/libevent2/event2/bufferevent_ssl.h
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/*
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* Copyright (c) 2009-2012 Niels Provos and Nick Mathewson
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef EVENT2_BUFFEREVENT_SSL_H_INCLUDED_
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#define EVENT2_BUFFEREVENT_SSL_H_INCLUDED_
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/** @file event2/bufferevent_ssl.h
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OpenSSL support for bufferevents.
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*/
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#include <event2/visibility.h>
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#include <event2/event-config.h>
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#include <event2/bufferevent.h>
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#include <event2/util.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* This is what openssl's SSL objects are underneath. */
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struct ssl_st;
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/**
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The state of an SSL object to be used when creating a new
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SSL bufferevent.
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*/
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enum bufferevent_ssl_state {
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BUFFEREVENT_SSL_OPEN = 0,
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BUFFEREVENT_SSL_CONNECTING = 1,
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BUFFEREVENT_SSL_ACCEPTING = 2
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};
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#if defined(EVENT__HAVE_OPENSSL) || defined(EVENT_IN_DOXYGEN_)
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/**
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Create a new SSL bufferevent to send its data over another bufferevent.
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@param base An event_base to use to detect reading and writing. It
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must also be the base for the underlying bufferevent.
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@param underlying A socket to use for this SSL
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@param ssl A SSL* object from openssl.
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@param state The current state of the SSL connection
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@param options One or more bufferevent_options
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@return A new bufferevent on success, or NULL on failure
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*/
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EVENT2_EXPORT_SYMBOL
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struct bufferevent *
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bufferevent_openssl_filter_new(struct event_base *base,
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struct bufferevent *underlying,
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struct ssl_st *ssl,
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enum bufferevent_ssl_state state,
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int options);
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/**
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Create a new SSL bufferevent to send its data over an SSL * on a socket.
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@param base An event_base to use to detect reading and writing
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@param fd A socket to use for this SSL
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@param ssl A SSL* object from openssl.
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@param state The current state of the SSL connection
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@param options One or more bufferevent_options
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@return A new bufferevent on success, or NULL on failure.
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*/
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EVENT2_EXPORT_SYMBOL
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struct bufferevent *
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bufferevent_openssl_socket_new(struct event_base *base,
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evutil_socket_t fd,
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struct ssl_st *ssl,
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enum bufferevent_ssl_state state,
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int options);
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/** Control how to report dirty SSL shutdowns.
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If the peer (or the network, or an attacker) closes the TCP
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connection before closing the SSL channel, and the protocol is SSL >= v3,
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this is a "dirty" shutdown. If allow_dirty_shutdown is 0 (default),
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this is reported as BEV_EVENT_ERROR.
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If instead allow_dirty_shutdown=1, a dirty shutdown is reported as
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BEV_EVENT_EOF.
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(Note that if the protocol is < SSLv3, you will always receive
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BEV_EVENT_EOF, since SSL 2 and earlier cannot distinguish a secure
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connection close from a dirty one. This is one reason (among many)
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not to use SSL 2.)
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*/
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EVENT2_EXPORT_SYMBOL
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int bufferevent_openssl_get_allow_dirty_shutdown(struct bufferevent *bev);
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EVENT2_EXPORT_SYMBOL
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void bufferevent_openssl_set_allow_dirty_shutdown(struct bufferevent *bev,
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int allow_dirty_shutdown);
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/** Return the underlying openssl SSL * object for an SSL bufferevent. */
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EVENT2_EXPORT_SYMBOL
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struct ssl_st *
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bufferevent_openssl_get_ssl(struct bufferevent *bufev);
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/** Tells a bufferevent to begin SSL renegotiation. */
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EVENT2_EXPORT_SYMBOL
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int bufferevent_ssl_renegotiate(struct bufferevent *bev);
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/** Return the most recent OpenSSL error reported on an SSL bufferevent. */
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EVENT2_EXPORT_SYMBOL
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unsigned long bufferevent_get_openssl_error(struct bufferevent *bev);
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* EVENT2_BUFFEREVENT_SSL_H_INCLUDED_ */
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