250 lines
8.1 KiB
C
250 lines
8.1 KiB
C
/*-
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* Copyright (c) 2005 Michael Bushkov <bushman@rsu.ru>
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* All rights reserved.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef __NSCD_PROTOCOL_H__
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#define __NSCD_PROTOCOL_H__
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/* maximum buffer size to receive - larger buffers are not allowed */
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#define MAX_BUFFER_SIZE (1 << 20)
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/* buffer size correctness checking routine */
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#define BUFSIZE_CORRECT(x) (((x) > 0) && ((x) < MAX_BUFFER_SIZE))
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#define BUFSIZE_INVALID(x) (!BUFSIZE_CORRECT(x))
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/* structures below represent the data that are sent/received by the daemon */
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struct cache_write_request {
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char *entry;
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char *cache_key;
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char *data;
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size_t entry_length;
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size_t cache_key_size;
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size_t data_size;
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};
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struct cache_write_response {
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int error_code;
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};
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struct cache_read_request {
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char *entry;
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char *cache_key;
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size_t entry_length;
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size_t cache_key_size;
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};
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struct cache_read_response {
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char *data; // ignored if error_code is not 0
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size_t data_size; // ignored if error_code is not 0
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int error_code;
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};
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enum transformation_type {
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TT_USER = 0, // transform only the entries of the caller
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TT_ALL = 1 // transform all entries
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};
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struct cache_transform_request {
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char *entry; // ignored if entry_length is 0
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size_t entry_length;
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int transformation_type;
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};
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struct cache_transform_response {
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int error_code;
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};
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struct cache_mp_write_session_request {
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char *entry;
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size_t entry_length;
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};
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struct cache_mp_write_session_response {
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int error_code;
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};
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struct cache_mp_write_session_write_request {
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char *data;
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size_t data_size;
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};
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struct cache_mp_write_session_write_response {
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int error_code;
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};
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struct cache_mp_read_session_request {
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char *entry;
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size_t entry_length;
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};
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struct cache_mp_read_session_response {
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int error_code;
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};
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struct cache_mp_read_session_read_response {
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char *data;
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size_t data_size;
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int error_code;
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};
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enum comm_element_t {
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CET_UNDEFINED = 0,
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CET_WRITE_REQUEST = 1,
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CET_WRITE_RESPONSE = 2,
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CET_READ_REQUEST = 3,
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CET_READ_RESPONSE = 4,
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CET_TRANSFORM_REQUEST = 5,
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CET_TRANSFORM_RESPONSE = 6,
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CET_MP_WRITE_SESSION_REQUEST = 7,
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CET_MP_WRITE_SESSION_RESPONSE = 8,
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CET_MP_WRITE_SESSION_WRITE_REQUEST = 9,
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CET_MP_WRITE_SESSION_WRITE_RESPONSE = 10,
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CET_MP_WRITE_SESSION_CLOSE_NOTIFICATION = 11,
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CET_MP_WRITE_SESSION_ABANDON_NOTIFICATION = 12,
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CET_MP_READ_SESSION_REQUEST = 13,
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CET_MP_READ_SESSION_RESPONSE = 14,
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CET_MP_READ_SESSION_READ_REQUEST = 15,
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CET_MP_READ_SESSION_READ_RESPONSE = 16,
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CET_MP_READ_SESSION_CLOSE_NOTIFICATION = 17,
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CET_MAX = 18
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};
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/*
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* The comm_element is used as the holder of any known (defined above) data
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* type that is to be sent/received.
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*/
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struct comm_element {
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union {
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struct cache_write_request c_write_request;
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struct cache_write_response c_write_response;
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struct cache_read_request c_read_request;
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struct cache_read_response c_read_response;
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struct cache_transform_request c_transform_request;
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struct cache_transform_response c_transform_response;
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struct cache_mp_write_session_request c_mp_ws_request;
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struct cache_mp_write_session_response c_mp_ws_response;
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struct cache_mp_write_session_write_request c_mp_ws_write_request;
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struct cache_mp_write_session_write_response c_mp_ws_write_response;
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struct cache_mp_read_session_request c_mp_rs_request;
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struct cache_mp_read_session_response c_mp_rs_response;
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struct cache_mp_read_session_read_response c_mp_rs_read_response;
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} /* anonymous */;
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enum comm_element_t type;
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};
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void init_comm_element(struct comm_element *, enum comm_element_t type);
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void finalize_comm_element(struct comm_element *);
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/*
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* For each type of data, there is three functions (init/finalize/get), that
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* used with comm_element structure
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*/
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void init_cache_write_request(struct cache_write_request *);
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void finalize_cache_write_request(struct cache_write_request *);
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struct cache_write_request *get_cache_write_request(struct comm_element *);
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void init_cache_write_response(struct cache_write_response *);
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void finalize_cache_write_response(struct cache_write_response *);
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struct cache_write_response *get_cache_write_response(struct comm_element *);
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void init_cache_read_request(struct cache_read_request *);
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void finalize_cache_read_request(struct cache_read_request *);
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struct cache_read_request *get_cache_read_request(struct comm_element *);
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void init_cache_read_response(struct cache_read_response *);
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void finalize_cache_read_response(struct cache_read_response *);
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struct cache_read_response *get_cache_read_response(struct comm_element *);
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void init_cache_transform_request(struct cache_transform_request *);
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void finalize_cache_transform_request(struct cache_transform_request *);
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struct cache_transform_request *get_cache_transform_request(
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struct comm_element *);
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void init_cache_transform_response(struct cache_transform_response *);
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void finalize_cache_transform_response(struct cache_transform_response *);
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struct cache_transform_response *get_cache_transform_response(
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struct comm_element *);
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void init_cache_mp_write_session_request(
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struct cache_mp_write_session_request *);
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void finalize_cache_mp_write_session_request(
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struct cache_mp_write_session_request *);
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struct cache_mp_write_session_request *
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get_cache_mp_write_session_request(struct comm_element *);
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void init_cache_mp_write_session_response(
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struct cache_mp_write_session_response *);
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void finalize_cache_mp_write_session_response(
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struct cache_mp_write_session_response *);
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struct cache_mp_write_session_response *
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get_cache_mp_write_session_response(struct comm_element *);
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void init_cache_mp_write_session_write_request(
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struct cache_mp_write_session_write_request *);
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void finalize_cache_mp_write_session_write_request(
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struct cache_mp_write_session_write_request *);
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struct cache_mp_write_session_write_request *
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get_cache_mp_write_session_write_request(struct comm_element *);
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void init_cache_mp_write_session_write_response(
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struct cache_mp_write_session_write_response *);
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void finalize_cache_mp_write_session_write_response(
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struct cache_mp_write_session_write_response *);
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struct cache_mp_write_session_write_response *
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get_cache_mp_write_session_write_response(struct comm_element *);
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void init_cache_mp_read_session_request(
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struct cache_mp_read_session_request *);
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void finalize_cache_mp_read_session_request(
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struct cache_mp_read_session_request *);
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struct cache_mp_read_session_request *get_cache_mp_read_session_request(
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struct comm_element *);
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void init_cache_mp_read_session_response(
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struct cache_mp_read_session_response *);
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void finalize_cache_mp_read_session_response(
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struct cache_mp_read_session_response *);
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struct cache_mp_read_session_response *
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get_cache_mp_read_session_response(struct comm_element *);
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void init_cache_mp_read_session_read_response(
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struct cache_mp_read_session_read_response *);
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void finalize_cache_mp_read_session_read_response(
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struct cache_mp_read_session_read_response *);
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struct cache_mp_read_session_read_response *
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get_cache_mp_read_session_read_response(struct comm_element *);
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#endif
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