1/*- 2 * Copyright (c) 2005 Michael Bushkov <bushman@rsu.ru> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 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. 13 * 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 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29#ifndef __NSCD_PROTOCOL_H__ 30#define __NSCD_PROTOCOL_H__ 31 32/* maximum buffer size to receive - larger buffers are not allowed */ 33#define MAX_BUFFER_SIZE (1 << 20) 34 35/* buffer size correctness checking routine */ 36#define BUFSIZE_CORRECT(x) (((x) > 0) && ((x) < MAX_BUFFER_SIZE)) 37#define BUFSIZE_INVALID(x) (!BUFSIZE_CORRECT(x)) 38 39/* structures below represent the data that are sent/received by the daemon */ 40struct cache_write_request { 41 char *entry; 42 char *cache_key; 43 char *data; 44 45 size_t entry_length; 46 size_t cache_key_size; 47 size_t data_size; 48}; 49 50struct cache_write_response { 51 int error_code; 52}; 53 54struct cache_read_request { 55 char *entry; 56 char *cache_key; 57 58 size_t entry_length; 59 size_t cache_key_size; 60}; 61 62struct cache_read_response { 63 char *data; // ignored if error_code is not 0 64 size_t data_size; // ignored if error_code is not 0 65 66 int error_code; 67}; 68 69enum transformation_type { 70 TT_USER = 0, // transform only the entries of the caller 71 TT_ALL = 1 // transform all entries 72}; 73 74struct cache_transform_request { 75 char *entry; // ignored if entry_length is 0 76 size_t entry_length; 77 78 int transformation_type; 79}; 80 81struct cache_transform_response { 82 int error_code; 83}; 84 85struct cache_mp_write_session_request { 86 char *entry; 87 size_t entry_length; 88}; 89 90struct cache_mp_write_session_response { 91 int error_code; 92}; 93 94struct cache_mp_write_session_write_request { 95 char *data; 96 size_t data_size; 97}; 98 99struct cache_mp_write_session_write_response { 100 int error_code; 101}; 102 103struct cache_mp_read_session_request { 104 char *entry; 105 size_t entry_length; 106}; 107 108struct cache_mp_read_session_response { 109 int error_code; 110}; 111 112struct cache_mp_read_session_read_response { 113 char *data; 114 size_t data_size; 115 116 int error_code; 117}; 118 119 120enum comm_element_t { 121 CET_UNDEFINED = 0, 122 CET_WRITE_REQUEST = 1, 123 CET_WRITE_RESPONSE = 2, 124 CET_READ_REQUEST = 3, 125 CET_READ_RESPONSE = 4, 126 CET_TRANSFORM_REQUEST = 5, 127 CET_TRANSFORM_RESPONSE = 6, 128 CET_MP_WRITE_SESSION_REQUEST = 7, 129 CET_MP_WRITE_SESSION_RESPONSE = 8, 130 CET_MP_WRITE_SESSION_WRITE_REQUEST = 9, 131 CET_MP_WRITE_SESSION_WRITE_RESPONSE = 10, 132 CET_MP_WRITE_SESSION_CLOSE_NOTIFICATION = 11, 133 CET_MP_WRITE_SESSION_ABANDON_NOTIFICATION = 12, 134 CET_MP_READ_SESSION_REQUEST = 13, 135 CET_MP_READ_SESSION_RESPONSE = 14, 136 CET_MP_READ_SESSION_READ_REQUEST = 15, 137 CET_MP_READ_SESSION_READ_RESPONSE = 16, 138 CET_MP_READ_SESSION_CLOSE_NOTIFICATION = 17, 139 CET_MAX = 18 140}; 141 142/* 143 * The comm_element is used as the holder of any known (defined above) data 144 * type that is to be sent/received. 145 */ 146struct comm_element { 147 union { 148 struct cache_write_request c_write_request; 149 struct cache_write_response c_write_response; 150 struct cache_read_request c_read_request; 151 struct cache_read_response c_read_response; 152 struct cache_transform_request c_transform_request; 153 struct cache_transform_response c_transform_response; 154 155 struct cache_mp_write_session_request c_mp_ws_request; 156 struct cache_mp_write_session_response c_mp_ws_response; 157 struct cache_mp_write_session_write_request c_mp_ws_write_request; 158 struct cache_mp_write_session_write_response c_mp_ws_write_response; 159 160 struct cache_mp_read_session_request c_mp_rs_request; 161 struct cache_mp_read_session_response c_mp_rs_response; 162 struct cache_mp_read_session_read_response c_mp_rs_read_response; 163 } /* anonymous */; 164 enum comm_element_t type; 165}; 166 167void init_comm_element(struct comm_element *, enum comm_element_t type); 168void finalize_comm_element(struct comm_element *); 169 170/* 171 * For each type of data, there is three functions (init/finalize/get), that 172 * used with comm_element structure 173 */ 174void init_cache_write_request(struct cache_write_request *); 175void finalize_cache_write_request(struct cache_write_request *); 176struct cache_write_request *get_cache_write_request(struct comm_element *); 177 178void init_cache_write_response(struct cache_write_response *); 179void finalize_cache_write_response(struct cache_write_response *); 180struct cache_write_response *get_cache_write_response(struct comm_element *); 181 182void init_cache_read_request(struct cache_read_request *); 183void finalize_cache_read_request(struct cache_read_request *); 184struct cache_read_request *get_cache_read_request(struct comm_element *); 185 186void init_cache_read_response(struct cache_read_response *); 187void finalize_cache_read_response(struct cache_read_response *); 188struct cache_read_response *get_cache_read_response(struct comm_element *); 189 190void init_cache_transform_request(struct cache_transform_request *); 191void finalize_cache_transform_request(struct cache_transform_request *); 192struct cache_transform_request *get_cache_transform_request( 193 struct comm_element *); 194 195void init_cache_transform_response(struct cache_transform_response *); 196void finalize_cache_transform_response(struct cache_transform_response *); 197struct cache_transform_response *get_cache_transform_response( 198 struct comm_element *); 199 200void init_cache_mp_write_session_request( 201 struct cache_mp_write_session_request *); 202void finalize_cache_mp_write_session_request( 203 struct cache_mp_write_session_request *); 204struct cache_mp_write_session_request * 205 get_cache_mp_write_session_request(struct comm_element *); 206 207void init_cache_mp_write_session_response( 208 struct cache_mp_write_session_response *); 209void finalize_cache_mp_write_session_response( 210 struct cache_mp_write_session_response *); 211struct cache_mp_write_session_response * 212 get_cache_mp_write_session_response(struct comm_element *); 213 214void init_cache_mp_write_session_write_request( 215 struct cache_mp_write_session_write_request *); 216void finalize_cache_mp_write_session_write_request( 217 struct cache_mp_write_session_write_request *); 218struct cache_mp_write_session_write_request * 219 get_cache_mp_write_session_write_request(struct comm_element *); 220 221void init_cache_mp_write_session_write_response( 222 struct cache_mp_write_session_write_response *); 223void finalize_cache_mp_write_session_write_response( 224 struct cache_mp_write_session_write_response *); 225struct cache_mp_write_session_write_response * 226 get_cache_mp_write_session_write_response(struct comm_element *); 227 228void init_cache_mp_read_session_request( 229 struct cache_mp_read_session_request *); 230void finalize_cache_mp_read_session_request( 231 struct cache_mp_read_session_request *); 232struct cache_mp_read_session_request *get_cache_mp_read_session_request( 233 struct comm_element *); 234 235void init_cache_mp_read_session_response( 236 struct cache_mp_read_session_response *); 237void finalize_cache_mp_read_session_response( 238 struct cache_mp_read_session_response *); 239struct cache_mp_read_session_response * 240 get_cache_mp_read_session_response(struct comm_element *); 241 242void init_cache_mp_read_session_read_response( 243 struct cache_mp_read_session_read_response *); 244void finalize_cache_mp_read_session_read_response( 245 struct cache_mp_read_session_read_response *); 246struct cache_mp_read_session_read_response * 247 get_cache_mp_read_session_read_response(struct comm_element *); 248 249#endif 250