usr.sbin/nscd/protocol.h

   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: src/usr.sbin/nscd/protocol.h,v 1.3 2007/09/27 12:30:11 bushman Exp $
  27  */
  28
  29 #ifndef __NSCD_PROTOCOL_H__
  30 #define __NSCD_PROTOCOL_H__
  31
  32 #include <stdlib.h>
  33
  34 /* maximum buffer size to receive - larger buffers are not allowed */
  35 #define MAX_BUFFER_SIZE (1 << 20)
  36
  37 /* buffer size correctness checking routine */
  38 #define BUFSIZE_CORRECT(x) (((x) > 0) && ((x) < MAX_BUFFER_SIZE))
  39 #define BUFSIZE_INVALID(x) (!BUFSIZE_CORRECT(x))
  40
  41 /* structures below represent the data that are sent/received by the daemon */
  42 struct cache_write_request
  43 {
  44         char    *entry;
  45         char    *cache_key;
  46         char    *data;
  47
  48         size_t  entry_length;
  49         size_t  cache_key_size;
  50         size_t  data_size;
  51 };
  52
  53 struct cache_write_response
  54 {
  55         int     error_code;
  56 };
  57
  58 struct cache_read_request
  59 {
  60         char    *entry;
  61         char    *cache_key;
  62
  63         size_t  entry_length;
  64         size_t  cache_key_size;
  65 };
  66
  67 struct cache_read_response
  68 {
  69         char    *data;                  // ignored if error_code is not 0
  70         size_t  data_size;              // ignored if error_code is not 0
  71
  72         int     error_code;
  73 };
  74
  75 enum transformation_type {
  76         TT_USER = 0,    // tranform only the entries of the caller
  77         TT_ALL = 1      // transform all entries
  78 };
  79
  80 struct cache_transform_request
  81 {
  82         char    *entry;                 // ignored if entry_length is 0
  83         size_t  entry_length;
  84
  85         int     transformation_type;
  86 };
  87
  88 struct cache_transform_response
  89 {
  90         int     error_code;
  91 };
  92
  93 struct cache_mp_write_session_request {
  94         char    *entry;
  95         size_t  entry_length;
  96 };
  97
  98 struct cache_mp_write_session_response {
  99         int     error_code;
 100 };
 101
 102 struct cache_mp_write_session_write_request {
 103         char    *data;
 104         size_t  data_size;
 105 };
 106
 107 struct cache_mp_write_session_write_response {
 108         int     error_code;
 109 };
 110
 111 struct cache_mp_read_session_request {
 112         char    *entry;
 113         size_t  entry_length;
 114 };
 115
 116 struct cache_mp_read_session_response {
 117         int     error_code;
 118 };
 119
 120 struct cache_mp_read_session_read_response {
 121         char    *data;
 122         size_t  data_size;
 123
 124         int     error_code;
 125 };
 126
 127
 128 enum comm_element_t {
 129         CET_UNDEFINED   = 0,
 130         CET_WRITE_REQUEST = 1,
 131         CET_WRITE_RESPONSE = 2,
 132         CET_READ_REQUEST = 3,
 133         CET_READ_RESPONSE = 4,
 134         CET_TRANSFORM_REQUEST = 5,
 135         CET_TRANSFORM_RESPONSE = 6,
 136         CET_MP_WRITE_SESSION_REQUEST = 7,
 137         CET_MP_WRITE_SESSION_RESPONSE = 8,
 138         CET_MP_WRITE_SESSION_WRITE_REQUEST = 9,
 139         CET_MP_WRITE_SESSION_WRITE_RESPONSE = 10,
 140         CET_MP_WRITE_SESSION_CLOSE_NOTIFICATION = 11,
 141         CET_MP_WRITE_SESSION_ABANDON_NOTIFICATION = 12,
 142         CET_MP_READ_SESSION_REQUEST = 13,
 143         CET_MP_READ_SESSION_RESPONSE = 14,
 144         CET_MP_READ_SESSION_READ_REQUEST = 15,
 145         CET_MP_READ_SESSION_READ_RESPONSE = 16,
 146         CET_MP_READ_SESSION_CLOSE_NOTIFICATION = 17,
 147         CET_MAX = 18
 148 };
 149
 150 /*
 151  * The comm_element is used as the holder of any known (defined above) data
 152  * type that is to be sent/received.
 153  */
 154 struct comm_element
 155 {
 156         union {
 157         struct cache_write_request c_write_request;
 158         struct cache_write_response c_write_response;
 159         struct cache_read_request c_read_request;
 160         struct cache_read_response c_read_response;
 161         struct cache_transform_request c_transform_request;
 162         struct cache_transform_response c_transform_response;
 163
 164         struct cache_mp_write_session_request c_mp_ws_request;
 165         struct cache_mp_write_session_response c_mp_ws_response;
 166         struct cache_mp_write_session_write_request c_mp_ws_write_request;
 167         struct cache_mp_write_session_write_response c_mp_ws_write_response;
 168
 169         struct cache_mp_read_session_request c_mp_rs_request;
 170         struct cache_mp_read_session_response c_mp_rs_response;
 171         struct cache_mp_read_session_read_response c_mp_rs_read_response;
 172         };
 173         enum comm_element_t type;
 174 };
 175
 176 extern void init_comm_element(struct comm_element *, enum comm_element_t type);
 177 extern void finalize_comm_element(struct comm_element *);
 178
 179 /*
 180  * For each type of data, there is three functions (init/finalize/get), that
 181  * used with comm_element structure
 182  */
 183 extern void init_cache_write_request(struct cache_write_request *);
 184 extern void finalize_cache_write_request(struct cache_write_request *);
 185 extern struct cache_write_request *get_cache_write_request(
 186         struct comm_element *);
 187
 188 extern void init_cache_write_response(struct cache_write_response *);
 189 extern void finalize_cache_write_response(struct cache_write_response *);
 190 extern struct cache_write_response *get_cache_write_response(
 191         struct comm_element *);
 192
 193 extern void init_cache_read_request(struct cache_read_request *);
 194 extern void finalize_cache_read_request(struct cache_read_request *);
 195 extern struct cache_read_request *get_cache_read_request(
 196         struct comm_element *);
 197
 198 extern void init_cache_read_response(struct cache_read_response *);
 199 extern void finalize_cache_read_response(struct cache_read_response *);
 200 extern struct cache_read_response *get_cache_read_response(
 201         struct comm_element *);
 202
 203 extern void init_cache_transform_request(struct cache_transform_request *);
 204 extern void finalize_cache_transform_request(struct cache_transform_request *);
 205 extern struct cache_transform_request *get_cache_transform_request(
 206         struct comm_element *);
 207
 208 extern void init_cache_transform_response(struct cache_transform_response *);
 209 extern void finalize_cache_transform_response(
 210         struct cache_transform_response *);
 211 extern struct cache_transform_response *get_cache_transform_response(
 212         struct comm_element *);
 213
 214 extern void init_cache_mp_write_session_request(
 215         struct cache_mp_write_session_request *);
 216 extern void finalize_cache_mp_write_session_request(
 217         struct cache_mp_write_session_request *);
 218 extern struct cache_mp_write_session_request *
 219         get_cache_mp_write_session_request(
 220         struct comm_element *);
 221
 222 extern void init_cache_mp_write_session_response(
 223         struct cache_mp_write_session_response *);
 224 extern void finalize_cache_mp_write_session_response(
 225         struct cache_mp_write_session_response *);
 226 extern struct cache_mp_write_session_response *
 227         get_cache_mp_write_session_response(struct comm_element *);
 228
 229 extern void init_cache_mp_write_session_write_request(
 230         struct cache_mp_write_session_write_request *);
 231 extern void finalize_cache_mp_write_session_write_request(
 232         struct cache_mp_write_session_write_request *);
 233 extern struct cache_mp_write_session_write_request *
 234         get_cache_mp_write_session_write_request(struct comm_element *);
 235
 236 extern void init_cache_mp_write_session_write_response(
 237         struct cache_mp_write_session_write_response *);
 238 extern void finalize_cache_mp_write_session_write_response(
 239         struct cache_mp_write_session_write_response *);
 240 extern struct cache_mp_write_session_write_response *
 241         get_cache_mp_write_session_write_response(struct comm_element *);
 242
 243 extern void init_cache_mp_read_session_request(
 244         struct cache_mp_read_session_request *);
 245 extern void finalize_cache_mp_read_session_request(
 246         struct cache_mp_read_session_request *);
 247 extern struct cache_mp_read_session_request *get_cache_mp_read_session_request(
 248         struct comm_element *);
 249
 250 extern void init_cache_mp_read_session_response(
 251         struct cache_mp_read_session_response *);
 252 extern void finalize_cache_mp_read_session_response(
 253         struct cache_mp_read_session_response *);
 254 extern struct cache_mp_read_session_response *
 255         get_cache_mp_read_session_response(
 256         struct comm_element *);
 257
 258 extern void init_cache_mp_read_session_read_response(
 259         struct cache_mp_read_session_read_response *);
 260 extern void finalize_cache_mp_read_session_read_response(
 261         struct cache_mp_read_session_read_response *);
 262 extern struct cache_mp_read_session_read_response *
 263         get_cache_mp_read_session_read_response(struct comm_element *);
 264
 265 #endif