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/*
* Copyright (C) 2020 Codership Oy <info@codership.com>
*
* This file is part of wsrep-lib.
*
* Wsrep-lib 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 2 of the License, or
* (at your option) any later version.
*
* Wsrep-lib 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 wsrep-lib. If not, see <https://www.gnu.org/licenses/>.
*/
/** @file tls_service.hpp
*
* Service interface for interacting with DBMS provided
* TLS and encryption facilities.
*/
#ifndef WSREP_TLS_SERVICE_HPP
#define WSREP_TLS_SERVICE_HPP
#include "compiler.hpp"
#include <sys/types.h> // ssize_t
namespace wsrep
{
/* Type tags for TLS context and TLS stream. */
struct tls_context { };
struct tls_stream { };
/** @class tls_service
*
* TLS service interface. This provides an interface corresponding
* to wsrep-API TLS service. For details see wsrep-API/wsrep_tls_service.h
*/
class tls_service
{
public:
enum status
{
success = 0,
want_read,
want_write,
eof,
error
};
struct op_result
{
/** Status code of the operation of negative system error number. */
ssize_t status;
/** Bytes transferred from/to given buffer during the operation. */
size_t bytes_transferred;
};
virtual ~tls_service() { }
/**
* @return Zero on success, system error code on failure.
*/
virtual tls_stream* create_tls_stream(int fd) WSREP_NOEXCEPT = 0;
virtual void destroy(tls_stream*) WSREP_NOEXCEPT = 0;
virtual int get_error_number(const tls_stream*) const WSREP_NOEXCEPT = 0;
virtual const void* get_error_category(const tls_stream*) const WSREP_NOEXCEPT = 0;
virtual const char* get_error_message(const tls_stream*,
int value, const void* category)
const WSREP_NOEXCEPT = 0;
/**
* @return Status enum.
*/
virtual status client_handshake(tls_stream*) WSREP_NOEXCEPT = 0;
/**
* @return Status enum or negative error code.
*/
virtual status server_handshake(tls_stream*) WSREP_NOEXCEPT = 0;
/**
* Read at most max_count bytes into buf.
*/
virtual op_result read(tls_stream*,
void* buf, size_t max_count) WSREP_NOEXCEPT = 0;
/**
* Write at most count bytes from buf.
*/
virtual op_result write(tls_stream*,
const void* buf, size_t count) WSREP_NOEXCEPT = 0;
/**
* Shutdown TLS stream.
*/
virtual status shutdown(tls_stream*) WSREP_NOEXCEPT = 0;
};
}
#endif // WSREP_TLS_SERVICE_HPP
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