2 * Copyright (c) 2005 Michael Bushkov <bushman@rsu.ru>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #ifndef __NSCD_PROTOCOL_H__
28 #define __NSCD_PROTOCOL_H__
30 /* maximum buffer size to receive - larger buffers are not allowed */
31 #define MAX_BUFFER_SIZE (1 << 20)
33 /* buffer size correctness checking routine */
34 #define BUFSIZE_CORRECT(x) (((x) > 0) && ((x) < MAX_BUFFER_SIZE))
35 #define BUFSIZE_INVALID(x) (!BUFSIZE_CORRECT(x))
37 /* structures below represent the data that are sent/received by the daemon */
38 struct cache_write_request {
44 size_t cache_key_size;
48 struct cache_write_response {
52 struct cache_read_request {
57 size_t cache_key_size;
60 struct cache_read_response {
61 char *data; // ignored if error_code is not 0
62 size_t data_size; // ignored if error_code is not 0
67 enum transformation_type {
68 TT_USER = 0, // transform only the entries of the caller
69 TT_ALL = 1 // transform all entries
72 struct cache_transform_request {
73 char *entry; // ignored if entry_length is 0
76 int transformation_type;
79 struct cache_transform_response {
83 struct cache_mp_write_session_request {
88 struct cache_mp_write_session_response {
92 struct cache_mp_write_session_write_request {
97 struct cache_mp_write_session_write_response {
101 struct cache_mp_read_session_request {
106 struct cache_mp_read_session_response {
110 struct cache_mp_read_session_read_response {
118 enum comm_element_t {
120 CET_WRITE_REQUEST = 1,
121 CET_WRITE_RESPONSE = 2,
122 CET_READ_REQUEST = 3,
123 CET_READ_RESPONSE = 4,
124 CET_TRANSFORM_REQUEST = 5,
125 CET_TRANSFORM_RESPONSE = 6,
126 CET_MP_WRITE_SESSION_REQUEST = 7,
127 CET_MP_WRITE_SESSION_RESPONSE = 8,
128 CET_MP_WRITE_SESSION_WRITE_REQUEST = 9,
129 CET_MP_WRITE_SESSION_WRITE_RESPONSE = 10,
130 CET_MP_WRITE_SESSION_CLOSE_NOTIFICATION = 11,
131 CET_MP_WRITE_SESSION_ABANDON_NOTIFICATION = 12,
132 CET_MP_READ_SESSION_REQUEST = 13,
133 CET_MP_READ_SESSION_RESPONSE = 14,
134 CET_MP_READ_SESSION_READ_REQUEST = 15,
135 CET_MP_READ_SESSION_READ_RESPONSE = 16,
136 CET_MP_READ_SESSION_CLOSE_NOTIFICATION = 17,
141 * The comm_element is used as the holder of any known (defined above) data
142 * type that is to be sent/received.
144 struct comm_element {
146 struct cache_write_request c_write_request;
147 struct cache_write_response c_write_response;
148 struct cache_read_request c_read_request;
149 struct cache_read_response c_read_response;
150 struct cache_transform_request c_transform_request;
151 struct cache_transform_response c_transform_response;
153 struct cache_mp_write_session_request c_mp_ws_request;
154 struct cache_mp_write_session_response c_mp_ws_response;
155 struct cache_mp_write_session_write_request c_mp_ws_write_request;
156 struct cache_mp_write_session_write_response c_mp_ws_write_response;
158 struct cache_mp_read_session_request c_mp_rs_request;
159 struct cache_mp_read_session_response c_mp_rs_response;
160 struct cache_mp_read_session_read_response c_mp_rs_read_response;
162 enum comm_element_t type;
165 void init_comm_element(struct comm_element *, enum comm_element_t type);
166 void finalize_comm_element(struct comm_element *);
169 * For each type of data, there is three functions (init/finalize/get), that
170 * used with comm_element structure
172 void init_cache_write_request(struct cache_write_request *);
173 void finalize_cache_write_request(struct cache_write_request *);
174 struct cache_write_request *get_cache_write_request(struct comm_element *);
176 void init_cache_write_response(struct cache_write_response *);
177 void finalize_cache_write_response(struct cache_write_response *);
178 struct cache_write_response *get_cache_write_response(struct comm_element *);
180 void init_cache_read_request(struct cache_read_request *);
181 void finalize_cache_read_request(struct cache_read_request *);
182 struct cache_read_request *get_cache_read_request(struct comm_element *);
184 void init_cache_read_response(struct cache_read_response *);
185 void finalize_cache_read_response(struct cache_read_response *);
186 struct cache_read_response *get_cache_read_response(struct comm_element *);
188 void init_cache_transform_request(struct cache_transform_request *);
189 void finalize_cache_transform_request(struct cache_transform_request *);
190 struct cache_transform_request *get_cache_transform_request(
191 struct comm_element *);
193 void init_cache_transform_response(struct cache_transform_response *);
194 void finalize_cache_transform_response(struct cache_transform_response *);
195 struct cache_transform_response *get_cache_transform_response(
196 struct comm_element *);
198 void init_cache_mp_write_session_request(
199 struct cache_mp_write_session_request *);
200 void finalize_cache_mp_write_session_request(
201 struct cache_mp_write_session_request *);
202 struct cache_mp_write_session_request *
203 get_cache_mp_write_session_request(struct comm_element *);
205 void init_cache_mp_write_session_response(
206 struct cache_mp_write_session_response *);
207 void finalize_cache_mp_write_session_response(
208 struct cache_mp_write_session_response *);
209 struct cache_mp_write_session_response *
210 get_cache_mp_write_session_response(struct comm_element *);
212 void init_cache_mp_write_session_write_request(
213 struct cache_mp_write_session_write_request *);
214 void finalize_cache_mp_write_session_write_request(
215 struct cache_mp_write_session_write_request *);
216 struct cache_mp_write_session_write_request *
217 get_cache_mp_write_session_write_request(struct comm_element *);
219 void init_cache_mp_write_session_write_response(
220 struct cache_mp_write_session_write_response *);
221 void finalize_cache_mp_write_session_write_response(
222 struct cache_mp_write_session_write_response *);
223 struct cache_mp_write_session_write_response *
224 get_cache_mp_write_session_write_response(struct comm_element *);
226 void init_cache_mp_read_session_request(
227 struct cache_mp_read_session_request *);
228 void finalize_cache_mp_read_session_request(
229 struct cache_mp_read_session_request *);
230 struct cache_mp_read_session_request *get_cache_mp_read_session_request(
231 struct comm_element *);
233 void init_cache_mp_read_session_response(
234 struct cache_mp_read_session_response *);
235 void finalize_cache_mp_read_session_response(
236 struct cache_mp_read_session_response *);
237 struct cache_mp_read_session_response *
238 get_cache_mp_read_session_response(struct comm_element *);
240 void init_cache_mp_read_session_read_response(
241 struct cache_mp_read_session_read_response *);
242 void finalize_cache_mp_read_session_read_response(
243 struct cache_mp_read_session_read_response *);
244 struct cache_mp_read_session_read_response *
245 get_cache_mp_read_session_read_response(struct comm_element *);