mingw/include/openssl/dtls1.h

   1 /* ssl/dtls1.h */
   2 /*
   3  * DTLS implementation written by Nagendra Modadugu
   4  * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 1999-2005 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    openssl-core@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59
  60 #ifndef HEADER_DTLS1_H
  61 #define HEADER_DTLS1_H
  62
  63 #include <openssl/buffer.h>
  64 #include <openssl/pqueue.h>
  65 #ifdef OPENSSL_SYS_VMS
  66 #include <resource.h>
  67 #include <sys/timeb.h>
  68 #endif
  69 #ifdef OPENSSL_SYS_WIN32
  70 /* Needed for struct timeval */
  71 #include <winsock.h>
  72 #elif defined(OPENSSL_SYS_NETWARE) && !defined(_WINSOCK2API_)
  73 #include <sys/timeval.h>
  74 #else
  75 #include <sys/time.h>
  76 #endif
  77
  78 #ifdef  __cplusplus
  79 extern "C" {
  80 #endif
  81
  82 #define DTLS1_VERSION                   0xFEFF
  83 #define DTLS1_BAD_VER                   0x0100
  84
  85 #if 0
  86 /* this alert description is not specified anywhere... */
  87 #define DTLS1_AD_MISSING_HANDSHAKE_MESSAGE    110
  88 #endif
  89
  90 /* lengths of messages */
  91 #define DTLS1_COOKIE_LENGTH                     256
  92
  93 #define DTLS1_RT_HEADER_LENGTH                  13
  94
  95 #define DTLS1_HM_HEADER_LENGTH                  12
  96
  97 #define DTLS1_HM_BAD_FRAGMENT                   -2
  98 #define DTLS1_HM_FRAGMENT_RETRY                 -3
  99
 100 #define DTLS1_CCS_HEADER_LENGTH                  1
 101
 102 #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
 103 #define DTLS1_AL_HEADER_LENGTH                   7
 104 #else
 105 #define DTLS1_AL_HEADER_LENGTH                   2
 106 #endif
 107
 108
 109 typedef struct dtls1_bitmap_st
 110         {
 111         PQ_64BIT map;
 112         unsigned long length;     /* sizeof the bitmap in bits */
 113         PQ_64BIT max_seq_num;  /* max record number seen so far */
 114         } DTLS1_BITMAP;
 115
 116 struct dtls1_retransmit_state
 117         {
 118         EVP_CIPHER_CTX *enc_write_ctx;  /* cryptographic state */
 119         const EVP_MD *write_hash;               /* used for mac generation */
 120 #ifndef OPENSSL_NO_COMP
 121         COMP_CTX *compress;                             /* compression */
 122 #else
 123         char *compress;
 124 #endif
 125         SSL_SESSION *session;
 126         unsigned short epoch;
 127         };
 128
 129 struct hm_header_st
 130         {
 131         unsigned char type;
 132         unsigned long msg_len;
 133         unsigned short seq;
 134         unsigned long frag_off;
 135         unsigned long frag_len;
 136         unsigned int is_ccs;
 137         struct dtls1_retransmit_state saved_retransmit_state;
 138         };
 139
 140 struct ccs_header_st
 141         {
 142         unsigned char type;
 143         unsigned short seq;
 144         };
 145
 146 struct dtls1_timeout_st
 147         {
 148         /* Number of read timeouts so far */
 149         unsigned int read_timeouts;
 150
 151         /* Number of write timeouts so far */
 152         unsigned int write_timeouts;
 153
 154         /* Number of alerts received so far */
 155         unsigned int num_alerts;
 156         };
 157
 158 typedef struct record_pqueue_st
 159         {
 160         unsigned short epoch;
 161         pqueue q;
 162         } record_pqueue;
 163
 164 typedef struct hm_fragment_st
 165         {
 166         struct hm_header_st msg_header;
 167         unsigned char *fragment;
 168         unsigned char *reassembly;
 169         } hm_fragment;
 170
 171 typedef struct dtls1_state_st
 172         {
 173         unsigned int send_cookie;
 174         unsigned char cookie[DTLS1_COOKIE_LENGTH];
 175         unsigned char rcvd_cookie[DTLS1_COOKIE_LENGTH];
 176         unsigned int cookie_len;
 177
 178         /*
 179          * The current data and handshake epoch.  This is initially
 180          * undefined, and starts at zero once the initial handshake is
 181          * completed
 182          */
 183         unsigned short r_epoch;
 184         unsigned short w_epoch;
 185
 186         /* records being received in the current epoch */
 187         DTLS1_BITMAP bitmap;
 188
 189         /* renegotiation starts a new set of sequence numbers */
 190         DTLS1_BITMAP next_bitmap;
 191
 192         /* handshake message numbers */
 193         unsigned short handshake_write_seq;
 194         unsigned short next_handshake_write_seq;
 195
 196         unsigned short handshake_read_seq;
 197
 198         /* save last sequence number for retransmissions */
 199         unsigned char last_write_sequence[8];
 200
 201         /* Received handshake records (processed and unprocessed) */
 202         record_pqueue unprocessed_rcds;
 203         record_pqueue processed_rcds;
 204
 205         /* Buffered handshake messages */
 206         pqueue buffered_messages;
 207
 208         /* Buffered (sent) handshake records */
 209         pqueue sent_messages;
 210
 211         /* Buffered application records.
 212          * Only for records between CCS and Finished
 213          * to prevent either protocol violation or
 214          * unnecessary message loss.
 215          */
 216         record_pqueue buffered_app_data;
 217
 218         /* Is set when listening for new connections with dtls1_listen() */
 219         unsigned int listen;
 220
 221         unsigned int mtu; /* max DTLS packet size */
 222
 223         struct hm_header_st w_msg_hdr;
 224         struct hm_header_st r_msg_hdr;
 225
 226         struct dtls1_timeout_st timeout;
 227
 228         /* Indicates when the last handshake msg sent will timeout */
 229         struct timeval next_timeout;
 230
 231         /* Timeout duration */
 232         unsigned short timeout_duration;
 233
 234         /* storage for Alert/Handshake protocol data received but not
 235          * yet processed by ssl3_read_bytes: */
 236         unsigned char alert_fragment[DTLS1_AL_HEADER_LENGTH];
 237         unsigned int alert_fragment_len;
 238         unsigned char handshake_fragment[DTLS1_HM_HEADER_LENGTH];
 239         unsigned int handshake_fragment_len;
 240
 241         unsigned int retransmitting;
 242         unsigned int change_cipher_spec_ok;
 243
 244         } DTLS1_STATE;
 245
 246 typedef struct dtls1_record_data_st
 247         {
 248         unsigned char *packet;
 249         unsigned int   packet_length;
 250         SSL3_BUFFER    rbuf;
 251         SSL3_RECORD    rrec;
 252         } DTLS1_RECORD_DATA;
 253
 254
 255 /* Timeout multipliers (timeout slice is defined in apps/timeouts.h */
 256 #define DTLS1_TMO_READ_COUNT                      2
 257 #define DTLS1_TMO_WRITE_COUNT                     2
 258
 259 #define DTLS1_TMO_ALERT_COUNT                     12
 260
 261 #ifdef  __cplusplus
 262 }
 263 #endif
 264 #endif
 265