/*-
* Copyright (c) 2005 Michael Bushkov <bushman@rsu.ru>
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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 __NSCD_PROTOCOL_H__
#define __NSCD_PROTOCOL_H__
/* maximum buffer size to receive - larger buffers are not allowed */
#define MAX_BUFFER_SIZE (1 << 20)
/* buffer size correctness checking routine */
#define BUFSIZE_CORRECT(x) (((x) > 0) && ((x) < MAX_BUFFER_SIZE))
#define BUFSIZE_INVALID(x) (!BUFSIZE_CORRECT(x))
/* structures below represent the data that are sent/received by the daemon */
struct cache_write_request {
char *entry;
char *cache_key;
char *data;
size_t entry_length;
size_t cache_key_size;
size_t data_size;
};
struct cache_write_response {
int error_code;
};
struct cache_read_request {
char *entry;
char *cache_key;
size_t entry_length;
size_t cache_key_size;
};
struct cache_read_response {
char *data; // ignored if error_code is not 0
size_t data_size; // ignored if error_code is not 0
int error_code;
};
enum transformation_type {
TT_USER = 0, // transform only the entries of the caller
TT_ALL = 1 // transform all entries
};
struct cache_transform_request {
char *entry; // ignored if entry_length is 0
size_t entry_length;
int transformation_type;
};
struct cache_transform_response {
int error_code;
};
struct cache_mp_write_session_request {
char *entry;
size_t entry_length;
};
struct cache_mp_write_session_response {
int error_code;
};
struct cache_mp_write_session_write_request {
char *data;
size_t data_size;
};
struct cache_mp_write_session_write_response {
int error_code;
};
struct cache_mp_read_session_request {
char *entry;
size_t entry_length;
};
struct cache_mp_read_session_response {
int error_code;
};
struct cache_mp_read_session_read_response {
char *data;
size_t data_size;
int error_code;
};
enum comm_element_t {
CET_UNDEFINED = 0,
CET_WRITE_REQUEST = 1,
CET_WRITE_RESPONSE = 2,
CET_READ_REQUEST = 3,
CET_READ_RESPONSE = 4,
CET_TRANSFORM_REQUEST = 5,
CET_TRANSFORM_RESPONSE = 6,
CET_MP_WRITE_SESSION_REQUEST = 7,
CET_MP_WRITE_SESSION_RESPONSE = 8,
CET_MP_WRITE_SESSION_WRITE_REQUEST = 9,
CET_MP_WRITE_SESSION_WRITE_RESPONSE = 10,
CET_MP_WRITE_SESSION_CLOSE_NOTIFICATION = 11,
CET_MP_WRITE_SESSION_ABANDON_NOTIFICATION = 12,
CET_MP_READ_SESSION_REQUEST = 13,
CET_MP_READ_SESSION_RESPONSE = 14,
CET_MP_READ_SESSION_READ_REQUEST = 15,
CET_MP_READ_SESSION_READ_RESPONSE = 16,
CET_MP_READ_SESSION_CLOSE_NOTIFICATION = 17,
CET_MAX = 18
};
/*
* The comm_element is used as the holder of any known (defined above) data
* type that is to be sent/received.
*/
struct comm_element {
union {
struct cache_write_request c_write_request;
struct cache_write_response c_write_response;
struct cache_read_request c_read_request;
struct cache_read_response c_read_response;
struct cache_transform_request c_transform_request;
struct cache_transform_response c_transform_response;
struct cache_mp_write_session_request c_mp_ws_request;
struct cache_mp_write_session_response c_mp_ws_response;
struct cache_mp_write_session_write_request c_mp_ws_write_request;
struct cache_mp_write_session_write_response c_mp_ws_write_response;
struct cache_mp_read_session_request c_mp_rs_request;
struct cache_mp_read_session_response c_mp_rs_response;
struct cache_mp_read_session_read_response c_mp_rs_read_response;
} /* anonymous */;
enum comm_element_t type;
};
void init_comm_element(struct comm_element *, enum comm_element_t type);
void finalize_comm_element(struct comm_element *);
/*
* For each type of data, there is three functions (init/finalize/get), that
* used with comm_element structure
*/
void init_cache_write_request(struct cache_write_request *);
void finalize_cache_write_request(struct cache_write_request *);
struct cache_write_request *get_cache_write_request(struct comm_element *);
void init_cache_write_response(struct cache_write_response *);
void finalize_cache_write_response(struct cache_write_response *);
struct cache_write_response *get_cache_write_response(struct comm_element *);
void init_cache_read_request(struct cache_read_request *);
void finalize_cache_read_request(struct cache_read_request *);
struct cache_read_request *get_cache_read_request(struct comm_element *);
void init_cache_read_response(struct cache_read_response *);
void finalize_cache_read_response(struct cache_read_response *);
struct cache_read_response *get_cache_read_response(struct comm_element *);
void init_cache_transform_request(struct cache_transform_request *);
void finalize_cache_transform_request(struct cache_transform_request *);
struct cache_transform_request *get_cache_transform_request(
struct comm_element *);
void init_cache_transform_response(struct cache_transform_response *);
void finalize_cache_transform_response(struct cache_transform_response *);
struct cache_transform_response *get_cache_transform_response(
struct comm_element *);
void init_cache_mp_write_session_request(
struct cache_mp_write_session_request *);
void finalize_cache_mp_write_session_request(
struct cache_mp_write_session_request *);
struct cache_mp_write_session_request *
get_cache_mp_write_session_request(struct comm_element *);
void init_cache_mp_write_session_response(
struct cache_mp_write_session_response *);
void finalize_cache_mp_write_session_response(
struct cache_mp_write_session_response *);
struct cache_mp_write_session_response *
get_cache_mp_write_session_response(struct comm_element *);
void init_cache_mp_write_session_write_request(
struct cache_mp_write_session_write_request *);
void finalize_cache_mp_write_session_write_request(
struct cache_mp_write_session_write_request *);
struct cache_mp_write_session_write_request *
get_cache_mp_write_session_write_request(struct comm_element *);
void init_cache_mp_write_session_write_response(
struct cache_mp_write_session_write_response *);
void finalize_cache_mp_write_session_write_response(
struct cache_mp_write_session_write_response *);
struct cache_mp_write_session_write_response *
get_cache_mp_write_session_write_response(struct comm_element *);
void init_cache_mp_read_session_request(
struct cache_mp_read_session_request *);
void finalize_cache_mp_read_session_request(
struct cache_mp_read_session_request *);
struct cache_mp_read_session_request *get_cache_mp_read_session_request(
struct comm_element *);
void init_cache_mp_read_session_response(
struct cache_mp_read_session_response *);
void finalize_cache_mp_read_session_response(
struct cache_mp_read_session_response *);
struct cache_mp_read_session_response *
get_cache_mp_read_session_response(struct comm_element *);
void init_cache_mp_read_session_read_response(
struct cache_mp_read_session_read_response *);
void finalize_cache_mp_read_session_read_response(
struct cache_mp_read_session_read_response *);
struct cache_mp_read_session_read_response *
get_cache_mp_read_session_read_response(struct comm_element *);
#endif
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