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/*
This file is part of libmicrospdy
Copyright (C) 2012 Andrey Uzunov
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file tls.h
* @brief TLS handling. openssl with NPN is used, but as long as the
* functions conform to this interface file, other libraries
* can be used.
* @author Andrey Uzunov
*/
#ifndef TLS_H
#define TLS_H
#include "platform.h"
#include <openssl/err.h>
#include <openssl/ssl.h>
#include <openssl/rand.h>
/* macros used in other files instead of types.
* useful in case of changing openssl to something else */
#define SPDYF_TLS_SESSION_CONTEXT SSL
#define SPDYF_TLS_DAEMON_CONTEXT SSL_CTX
/**
* Used for return code when reading and writing to the TLS socket.
*/
enum SPDY_TLS_ERROR
{
/**
* The connection was closed by the other party.
*/
SPDY_TLS_ERROR_CLOSED = 0,
/**
* Any kind of error ocurred. The session has to be closed.
*/
SPDY_TLS_ERROR_ERROR = -2,
/**
* The function had to return without processing any data. The whole
* cycle of events has to be called again (SPDY_run) as something
* either has to be written or read or the the syscall was
* interrupted by a signal.
*/
SPDY_TLS_ERROR_AGAIN = -3,
};
/**
* Global initializing of openssl. Must be called only once in the program.
*
*/
void
SPDYF_tls_global_init();
/**
* Global deinitializing of openssl for the whole program. Should be called
* at the end of the program.
*
*/
void
SPDYF_tls_global_deinit();
/**
* Initializing of openssl for a specific daemon.
* Must be called when the daemon starts.
*
* @param daemon SPDY_Daemon for which openssl will be used. Daemon's
* certificate and key file are used.
* @return SPDY_YES on success or SPDY_NO on error
*/
int
SPDYF_tls_init(struct SPDY_Daemon *daemon);
/**
* Deinitializing openssl for a daemon. Should be called
* when the deamon is stopped.
*
* @param daemon SPDY_Daemon which is being stopped
*/
void
SPDYF_tls_deinit(struct SPDY_Daemon *daemon);
/**
* Initializing openssl for a specific connection. Must be called
* after the connection has been accepted.
*
* @param session SPDY_Session whose socket will be used by openssl
* @return SPDY_NO if some openssl funcs fail. SPDY_YES otherwise
*/
int
SPDYF_tls_new_session(struct SPDY_Session *session);
/**
* Deinitializing openssl for a specific connection. Should be called
* closing session's socket.
*
* @param session SPDY_Session whose socket is used by openssl
*/
void
SPDYF_tls_close_session(struct SPDY_Session *session);
/**
* Reading from a TLS socket. Reads available data and put it to the
* buffer.
*
* @param session for which data is received
* @param buffer where data from the socket will be written to
* @param size of the buffer
* @return number of bytes (at most size) read from the TLS connection
* 0 if the other party has closed the connection
* SPDY_TLS_ERROR code on error
*/
int
SPDYF_tls_recv(struct SPDY_Session *session,
void * buffer,
size_t size);
/**
* Writing to a TLS socket. Writes the data given into the buffer to the
* TLS socket.
*
* @param session whose context is used
* @param buffer from where data will be written to the socket
* @param size number of bytes to be taken from the buffer
* @return number of bytes (at most size) from the buffer that has been
* written to the TLS connection
* 0 if the other party has closed the connection
* SPDY_TLS_ERROR code on error
*/
int
SPDYF_tls_send(struct SPDY_Session *session,
const void * buffer,
size_t size);
/**
* Checks if there is data staying in the buffers of the underlying
* system that waits to be read.
*
* @param session which is checked
* @return SPDY_YES if data is pending or SPDY_NO otherwise
*/
int
SPDYF_tls_is_pending(struct SPDY_Session *session);
#endif
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