crypto/openssl/ssl/d1_pkt.c

   1 /* ssl/d1_pkt.c */
   2 /*
   3  * DTLS implementation written by Nagendra Modadugu
   4  * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 1998-2005 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 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  60  * All rights reserved.
  61  *
  62  * This package is an SSL implementation written
  63  * by Eric Young (eay@cryptsoft.com).
  64  * The implementation was written so as to conform with Netscapes SSL.
  65  *
  66  * This library is free for commercial and non-commercial use as long as
  67  * the following conditions are aheared to.  The following conditions
  68  * apply to all code found in this distribution, be it the RC4, RSA,
  69  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  70  * included with this distribution is covered by the same copyright terms
  71  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  72  *
  73  * Copyright remains Eric Young's, and as such any Copyright notices in
  74  * the code are not to be removed.
  75  * If this package is used in a product, Eric Young should be given attribution
  76  * as the author of the parts of the library used.
  77  * This can be in the form of a textual message at program startup or
  78  * in documentation (online or textual) provided with the package.
  79  *
  80  * Redistribution and use in source and binary forms, with or without
  81  * modification, are permitted provided that the following conditions
  82  * are met:
  83  * 1. Redistributions of source code must retain the copyright
  84  *    notice, this list of conditions and the following disclaimer.
  85  * 2. Redistributions in binary form must reproduce the above copyright
  86  *    notice, this list of conditions and the following disclaimer in the
  87  *    documentation and/or other materials provided with the distribution.
  88  * 3. All advertising materials mentioning features or use of this software
  89  *    must display the following acknowledgement:
  90  *    "This product includes cryptographic software written by
  91  *     Eric Young (eay@cryptsoft.com)"
  92  *    The word 'cryptographic' can be left out if the rouines from the library
  93  *    being used are not cryptographic related :-).
  94  * 4. If you include any Windows specific code (or a derivative thereof) from
  95  *    the apps directory (application code) you must include an acknowledgement:
  96  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  97  *
  98  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  99  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 100  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 101  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 102  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 103  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 104  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 105  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 106  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 107  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 108  * SUCH DAMAGE.
 109  *
 110  * The licence and distribution terms for any publically available version or
 111  * derivative of this code cannot be changed.  i.e. this code cannot simply be
 112  * copied and put under another distribution licence
 113  * [including the GNU Public Licence.]
 114  */
 115
 116 #include <stdio.h>
 117 #include <errno.h>
 118 #define USE_SOCKETS
 119 #include "ssl_locl.h"
 120 #include <openssl/evp.h>
 121 #include <openssl/buffer.h>
 122 #include <openssl/pqueue.h>
 123 #include <openssl/rand.h>
 124
 125 static int have_handshake_fragment(SSL *s, int type, unsigned char *buf,
 126         int len, int peek);
 127 static int dtls1_record_replay_check(SSL *s, DTLS1_BITMAP *bitmap,
 128         PQ_64BIT *seq_num);
 129 static void dtls1_record_bitmap_update(SSL *s, DTLS1_BITMAP *bitmap);
 130 static DTLS1_BITMAP *dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr,
 131     unsigned int *is_next_epoch);
 132 #if 0
 133 static int dtls1_record_needs_buffering(SSL *s, SSL3_RECORD *rr,
 134         unsigned short *priority, unsigned long *offset);
 135 #endif
 136 static int dtls1_buffer_record(SSL *s, record_pqueue *q,
 137         PQ_64BIT priority);
 138 static int dtls1_process_record(SSL *s);
 139 #if PQ_64BIT_IS_INTEGER
 140 static PQ_64BIT bytes_to_long_long(unsigned char *bytes, PQ_64BIT *num);
 141 #endif
 142 static void dtls1_clear_timeouts(SSL *s);
 143
 144 /* copy buffered record into SSL structure */
 145 static int
 146 dtls1_copy_record(SSL *s, pitem *item)
 147     {
 148     DTLS1_RECORD_DATA *rdata;
 149
 150     rdata = (DTLS1_RECORD_DATA *)item->data;
 151
 152     if (s->s3->rbuf.buf != NULL)
 153         OPENSSL_free(s->s3->rbuf.buf);
 154
 155     s->packet = rdata->packet;
 156     s->packet_length = rdata->packet_length;
 157     memcpy(&(s->s3->rbuf), &(rdata->rbuf), sizeof(SSL3_BUFFER));
 158     memcpy(&(s->s3->rrec), &(rdata->rrec), sizeof(SSL3_RECORD));
 159
 160     return(1);
 161     }
 162
 163
 164 static int
 165 dtls1_buffer_record(SSL *s, record_pqueue *queue, PQ_64BIT priority)
 166 {
 167     DTLS1_RECORD_DATA *rdata;
 168         pitem *item;
 169
 170         /* Limit the size of the queue to prevent DOS attacks */
 171         if (pqueue_size(queue->q) >= 100)
 172                 return 0;
 173
 174         rdata = OPENSSL_malloc(sizeof(DTLS1_RECORD_DATA));
 175         item = pitem_new(priority, rdata);
 176         if (rdata == NULL || item == NULL)
 177                 {
 178                 if (rdata != NULL) OPENSSL_free(rdata);
 179                 if (item != NULL) pitem_free(item);
 180
 181                 SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
 182                 return(0);
 183                 }
 184
 185         rdata->packet = s->packet;
 186         rdata->packet_length = s->packet_length;
 187         memcpy(&(rdata->rbuf), &(s->s3->rbuf), sizeof(SSL3_BUFFER));
 188         memcpy(&(rdata->rrec), &(s->s3->rrec), sizeof(SSL3_RECORD));
 189
 190         item->data = rdata;
 191
 192         /* insert should not fail, since duplicates are dropped */
 193         if (pqueue_insert(queue->q, item) == NULL)
 194                 {
 195                 OPENSSL_free(rdata);
 196                 pitem_free(item);
 197                 return(0);
 198                 }
 199
 200         s->packet = NULL;
 201         s->packet_length = 0;
 202         memset(&(s->s3->rbuf), 0, sizeof(SSL3_BUFFER));
 203         memset(&(s->s3->rrec), 0, sizeof(SSL3_RECORD));
 204
 205         if (!ssl3_setup_buffers(s))
 206                 {
 207                 SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
 208                 OPENSSL_free(rdata);
 209                 pitem_free(item);
 210                 return(0);
 211                 }
 212
 213         return(1);
 214     }
 215
 216
 217 static int
 218 dtls1_retrieve_buffered_record(SSL *s, record_pqueue *queue)
 219     {
 220     pitem *item;
 221
 222     item = pqueue_pop(queue->q);
 223     if (item)
 224         {
 225         dtls1_copy_record(s, item);
 226
 227         OPENSSL_free(item->data);
 228                 pitem_free(item);
 229
 230         return(1);
 231         }
 232
 233     return(0);
 234     }
 235
 236
 237 /* retrieve a buffered record that belongs to the new epoch, i.e., not processed
 238  * yet */
 239 #define dtls1_get_unprocessed_record(s) \
 240                    dtls1_retrieve_buffered_record((s), \
 241                    &((s)->d1->unprocessed_rcds))
 242
 243 /* retrieve a buffered record that belongs to the current epoch, ie, processed */
 244 #define dtls1_get_processed_record(s) \
 245                    dtls1_retrieve_buffered_record((s), \
 246                    &((s)->d1->processed_rcds))
 247
 248 static int
 249 dtls1_process_buffered_records(SSL *s)
 250     {
 251     pitem *item;
 252
 253     item = pqueue_peek(s->d1->unprocessed_rcds.q);
 254     if (item)
 255         {
 256         DTLS1_RECORD_DATA *rdata;
 257         rdata = (DTLS1_RECORD_DATA *)item->data;
 258
 259         /* Check if epoch is current. */
 260         if (s->d1->unprocessed_rcds.epoch != s->d1->r_epoch)
 261             return(1);  /* Nothing to do. */
 262
 263         /* Process all the records. */
 264         while (pqueue_peek(s->d1->unprocessed_rcds.q))
 265             {
 266             dtls1_get_unprocessed_record(s);
 267             if ( ! dtls1_process_record(s))
 268                 return(0);
 269             dtls1_buffer_record(s, &(s->d1->processed_rcds),
 270                 s->s3->rrec.seq_num);
 271             }
 272         }
 273
 274     /* sync epoch numbers once all the unprocessed records
 275      * have been processed */
 276     s->d1->processed_rcds.epoch = s->d1->r_epoch;
 277     s->d1->unprocessed_rcds.epoch = s->d1->r_epoch + 1;
 278
 279     return(1);
 280     }
 281
 282
 283 #if 0
 284
 285 static int
 286 dtls1_get_buffered_record(SSL *s)
 287         {
 288         pitem *item;
 289         PQ_64BIT priority =
 290                 (((PQ_64BIT)s->d1->handshake_read_seq) << 32) |
 291                 ((PQ_64BIT)s->d1->r_msg_hdr.frag_off);
 292
 293         if ( ! SSL_in_init(s))  /* if we're not (re)negotiating,
 294                                                            nothing buffered */
 295                 return 0;
 296
 297
 298         item = pqueue_peek(s->d1->rcvd_records);
 299         if (item && item->priority == priority)
 300                 {
 301                 /* Check if we've received the record of interest.  It must be
 302                  * a handshake record, since data records as passed up without
 303                  * buffering */
 304                 DTLS1_RECORD_DATA *rdata;
 305                 item = pqueue_pop(s->d1->rcvd_records);
 306                 rdata = (DTLS1_RECORD_DATA *)item->data;
 307
 308                 if (s->s3->rbuf.buf != NULL)
 309                         OPENSSL_free(s->s3->rbuf.buf);
 310
 311                 s->packet = rdata->packet;
 312                 s->packet_length = rdata->packet_length;
 313                 memcpy(&(s->s3->rbuf), &(rdata->rbuf), sizeof(SSL3_BUFFER));
 314                 memcpy(&(s->s3->rrec), &(rdata->rrec), sizeof(SSL3_RECORD));
 315
 316                 OPENSSL_free(item->data);
 317                 pitem_free(item);
 318
 319                 /* s->d1->next_expected_seq_num++; */
 320                 return(1);
 321                 }
 322
 323         return 0;
 324         }
 325
 326 #endif
 327
 328 static int
 329 dtls1_process_record(SSL *s)
 330 {
 331     int i,al;
 332         int clear=0;
 333     int enc_err;
 334         SSL_SESSION *sess;
 335     SSL3_RECORD *rr;
 336         unsigned int mac_size;
 337         unsigned char md[EVP_MAX_MD_SIZE];
 338
 339
 340         rr= &(s->s3->rrec);
 341     sess = s->session;
 342
 343         /* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length,
 344          * and we have that many bytes in s->packet
 345          */
 346         rr->input= &(s->packet[DTLS1_RT_HEADER_LENGTH]);
 347
 348         /* ok, we can now read from 's->packet' data into 'rr'
 349          * rr->input points at rr->length bytes, which
 350          * need to be copied into rr->data by either
 351          * the decryption or by the decompression
 352          * When the data is 'copied' into the rr->data buffer,
 353          * rr->input will be pointed at the new buffer */
 354
 355         /* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
 356          * rr->length bytes of encrypted compressed stuff. */
 357
 358         /* check is not needed I believe */
 359         if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH)
 360                 {
 361                 al=SSL_AD_RECORD_OVERFLOW;
 362                 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
 363                 goto f_err;
 364                 }
 365
 366         /* decrypt in place in 'rr->input' */
 367         rr->data=rr->input;
 368
 369         enc_err = s->method->ssl3_enc->enc(s,0);
 370         if (enc_err <= 0)
 371                 {
 372                 if (enc_err == 0)
 373                         /* SSLerr() and ssl3_send_alert() have been called */
 374                         goto err;
 375
 376                 /* otherwise enc_err == -1 */
 377                 goto decryption_failed_or_bad_record_mac;
 378                 }
 379
 380 #ifdef TLS_DEBUG
 381 printf("dec %d\n",rr->length);
 382 { unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); }
 383 printf("\n");
 384 #endif
 385
 386         /* r->length is now the compressed data plus mac */
 387 if (    (sess == NULL) ||
 388                 (s->enc_read_ctx == NULL) ||
 389                 (s->read_hash == NULL))
 390     clear=1;
 391
 392         if (!clear)
 393                 {
 394                 mac_size=EVP_MD_size(s->read_hash);
 395
 396                 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+mac_size)
 397                         {
 398 #if 0 /* OK only for stream ciphers (then rr->length is visible from ciphertext anyway) */
 399                         al=SSL_AD_RECORD_OVERFLOW;
 400                         SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_PRE_MAC_LENGTH_TOO_LONG);
 401                         goto f_err;
 402 #else
 403                         goto decryption_failed_or_bad_record_mac;
 404 #endif
 405                         }
 406                 /* check the MAC for rr->input (it's in mac_size bytes at the tail) */
 407                 if (rr->length < mac_size)
 408                         {
 409 #if 0 /* OK only for stream ciphers */
 410                         al=SSL_AD_DECODE_ERROR;
 411                         SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_LENGTH_TOO_SHORT);
 412                         goto f_err;
 413 #else
 414                         goto decryption_failed_or_bad_record_mac;
 415 #endif
 416                         }
 417                 rr->length-=mac_size;
 418                 i=s->method->ssl3_enc->mac(s,md,0);
 419                 if (memcmp(md,&(rr->data[rr->length]),mac_size) != 0)
 420                         {
 421                         goto decryption_failed_or_bad_record_mac;
 422                         }
 423                 }
 424
 425         /* r->length is now just compressed */
 426         if (s->expand != NULL)
 427                 {
 428                 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH)
 429                         {
 430                         al=SSL_AD_RECORD_OVERFLOW;
 431                         SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG);
 432                         goto f_err;
 433                         }
 434                 if (!ssl3_do_uncompress(s))
 435                         {
 436                         al=SSL_AD_DECOMPRESSION_FAILURE;
 437                         SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_BAD_DECOMPRESSION);
 438                         goto f_err;
 439                         }
 440                 }
 441
 442         if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH)
 443                 {
 444                 al=SSL_AD_RECORD_OVERFLOW;
 445                 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_DATA_LENGTH_TOO_LONG);
 446                 goto f_err;
 447                 }
 448
 449         rr->off=0;
 450         /* So at this point the following is true
 451          * ssl->s3->rrec.type   is the type of record
 452          * ssl->s3->rrec.length == number of bytes in record
 453          * ssl->s3->rrec.off    == offset to first valid byte
 454          * ssl->s3->rrec.data   == where to take bytes from, increment
 455          *                         after use :-).
 456          */
 457
 458         /* we have pulled in a full packet so zero things */
 459         s->packet_length=0;
 460     dtls1_record_bitmap_update(s, &(s->d1->bitmap));/* Mark receipt of record. */
 461     return(1);
 462
 463 decryption_failed_or_bad_record_mac:
 464         /* Separate 'decryption_failed' alert was introduced with TLS 1.0,
 465          * SSL 3.0 only has 'bad_record_mac'.  But unless a decryption
 466          * failure is directly visible from the ciphertext anyway,
 467          * we should not reveal which kind of error occured -- this
 468          * might become visible to an attacker (e.g. via logfile) */
 469         al=SSL_AD_BAD_RECORD_MAC;
 470         SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC);
 471 f_err:
 472         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 473 err:
 474         return(0);
 475 }
 476
 477
 478 /* Call this to get a new input record.
 479  * It will return <= 0 if more data is needed, normally due to an error
 480  * or non-blocking IO.
 481  * When it finishes, one packet has been decoded and can be found in
 482  * ssl->s3->rrec.type    - is the type of record
 483  * ssl->s3->rrec.data,   - data
 484  * ssl->s3->rrec.length, - number of bytes
 485  */
 486 /* used only by dtls1_read_bytes */
 487 int dtls1_get_record(SSL *s)
 488         {
 489         int ssl_major,ssl_minor,al;
 490         int i,n;
 491         SSL3_RECORD *rr;
 492         SSL_SESSION *sess;
 493         unsigned char *p;
 494         unsigned short version;
 495         DTLS1_BITMAP *bitmap;
 496         unsigned int is_next_epoch;
 497
 498         rr= &(s->s3->rrec);
 499         sess=s->session;
 500
 501     /* The epoch may have changed.  If so, process all the
 502      * pending records.  This is a non-blocking operation. */
 503     if ( ! dtls1_process_buffered_records(s))
 504         return 0;
 505
 506         /* if we're renegotiating, then there may be buffered records */
 507         if (dtls1_get_processed_record(s))
 508                 return 1;
 509
 510         /* get something from the wire */
 511 again:
 512         /* check if we have the header */
 513         if (    (s->rstate != SSL_ST_READ_BODY) ||
 514                 (s->packet_length < DTLS1_RT_HEADER_LENGTH))
 515                 {
 516                 n=ssl3_read_n(s, DTLS1_RT_HEADER_LENGTH, s->s3->rbuf.len, 0);
 517                 /* read timeout is handled by dtls1_read_bytes */
 518                 if (n <= 0) return(n); /* error or non-blocking */
 519
 520                 OPENSSL_assert(s->packet_length == DTLS1_RT_HEADER_LENGTH);
 521
 522                 s->rstate=SSL_ST_READ_BODY;
 523
 524                 p=s->packet;
 525
 526                 /* Pull apart the header into the DTLS1_RECORD */
 527                 rr->type= *(p++);
 528                 ssl_major= *(p++);
 529                 ssl_minor= *(p++);
 530                 version=(ssl_major<<8)|ssl_minor;
 531
 532                 /* sequence number is 64 bits, with top 2 bytes = epoch */
 533                 n2s(p,rr->epoch);
 534
 535                 memcpy(&(s->s3->read_sequence[2]), p, 6);
 536                 p+=6;
 537
 538                 n2s(p,rr->length);
 539
 540                 /* Lets check version */
 541                 if (!s->first_packet)
 542                         {
 543                         if (version != s->version && version != DTLS1_BAD_VER)
 544                                 {
 545                                 SSLerr(SSL_F_DTLS1_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
 546                                 /* Send back error using their
 547                                  * version number :-) */
 548                                 s->version=version;
 549                                 al=SSL_AD_PROTOCOL_VERSION;
 550                                 goto f_err;
 551                                 }
 552                         }
 553
 554                 if ((version & 0xff00) != (DTLS1_VERSION & 0xff00) &&
 555                     (version & 0xff00) != (DTLS1_BAD_VER & 0xff00))
 556                         {
 557                         SSLerr(SSL_F_DTLS1_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
 558                         goto err;
 559                         }
 560
 561                 if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH)
 562                         {
 563                         al=SSL_AD_RECORD_OVERFLOW;
 564                         SSLerr(SSL_F_DTLS1_GET_RECORD,SSL_R_PACKET_LENGTH_TOO_LONG);
 565                         goto f_err;
 566                         }
 567
 568                 s->client_version = version;
 569                 /* now s->rstate == SSL_ST_READ_BODY */
 570                 }
 571
 572         /* s->rstate == SSL_ST_READ_BODY, get and decode the data */
 573
 574         if (rr->length > s->packet_length-DTLS1_RT_HEADER_LENGTH)
 575                 {
 576                 /* now s->packet_length == DTLS1_RT_HEADER_LENGTH */
 577                 i=rr->length;
 578                 n=ssl3_read_n(s,i,i,1);
 579                 if (n <= 0) return(n); /* error or non-blocking io */
 580
 581                 /* this packet contained a partial record, dump it */
 582                 if ( n != i)
 583                         {
 584                         s->packet_length = 0;
 585                         goto again;
 586                         }
 587
 588                 /* now n == rr->length,
 589                  * and s->packet_length == DTLS1_RT_HEADER_LENGTH + rr->length */
 590                 }
 591         s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */
 592
 593         /* match epochs.  NULL means the packet is dropped on the floor */
 594         bitmap = dtls1_get_bitmap(s, rr, &is_next_epoch);
 595         if ( bitmap == NULL)
 596         {
 597         s->packet_length = 0;  /* dump this record */
 598         goto again;   /* get another record */
 599                 }
 600
 601         /* check whether this is a repeat, or aged record */
 602         if ( ! dtls1_record_replay_check(s, bitmap, &(rr->seq_num)))
 603                 {
 604                 rr->length = 0;
 605                 s->packet_length=0; /* dump this record */
 606                 goto again;     /* get another record */
 607                 }
 608
 609         /* just read a 0 length packet */
 610         if (rr->length == 0) goto again;
 611
 612     /* If this record is from the next epoch (either HM or ALERT), buffer it
 613      * since it cannot be processed at this time.
 614      * Records from the next epoch are marked as received even though they are
 615      * not processed, so as to prevent any potential resource DoS attack */
 616     if (is_next_epoch)
 617         {
 618         dtls1_record_bitmap_update(s, bitmap);
 619         dtls1_buffer_record(s, &(s->d1->unprocessed_rcds), rr->seq_num);
 620         s->packet_length = 0;
 621         goto again;
 622         }
 623
 624     if ( ! dtls1_process_record(s))
 625         return(0);
 626
 627         dtls1_clear_timeouts(s);  /* done waiting */
 628         return(1);
 629
 630 f_err:
 631         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 632 err:
 633         return(0);
 634         }
 635
 636 /* Return up to 'len' payload bytes received in 'type' records.
 637  * 'type' is one of the following:
 638  *
 639  *   -  SSL3_RT_HANDSHAKE (when ssl3_get_message calls us)
 640  *   -  SSL3_RT_APPLICATION_DATA (when ssl3_read calls us)
 641  *   -  0 (during a shutdown, no data has to be returned)
 642  *
 643  * If we don't have stored data to work from, read a SSL/TLS record first
 644  * (possibly multiple records if we still don't have anything to return).
 645  *
 646  * This function must handle any surprises the peer may have for us, such as
 647  * Alert records (e.g. close_notify), ChangeCipherSpec records (not really
 648  * a surprise, but handled as if it were), or renegotiation requests.
 649  * Also if record payloads contain fragments too small to process, we store
 650  * them until there is enough for the respective protocol (the record protocol
 651  * may use arbitrary fragmentation and even interleaving):
 652  *     Change cipher spec protocol
 653  *             just 1 byte needed, no need for keeping anything stored
 654  *     Alert protocol
 655  *             2 bytes needed (AlertLevel, AlertDescription)
 656  *     Handshake protocol
 657  *             4 bytes needed (HandshakeType, uint24 length) -- we just have
 658  *             to detect unexpected Client Hello and Hello Request messages
 659  *             here, anything else is handled by higher layers
 660  *     Application data protocol
 661  *             none of our business
 662  */
 663 int dtls1_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek)
 664         {
 665         int al,i,j,ret;
 666         unsigned int n;
 667         SSL3_RECORD *rr;
 668         void (*cb)(const SSL *ssl,int type2,int val)=NULL;
 669
 670         if (s->s3->rbuf.buf == NULL) /* Not initialized yet */
 671                 if (!ssl3_setup_buffers(s))
 672                         return(-1);
 673
 674     /* XXX: check what the second '&& type' is about */
 675         if ((type && (type != SSL3_RT_APPLICATION_DATA) &&
 676                 (type != SSL3_RT_HANDSHAKE) && type) ||
 677             (peek && (type != SSL3_RT_APPLICATION_DATA)))
 678                 {
 679                 SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR);
 680                 return -1;
 681                 }
 682
 683         /* check whether there's a handshake message (client hello?) waiting */
 684         if ( (ret = have_handshake_fragment(s, type, buf, len, peek)))
 685                 return ret;
 686
 687         /* Now s->d1->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */
 688
 689         if (!s->in_handshake && SSL_in_init(s))
 690                 {
 691                 /* type == SSL3_RT_APPLICATION_DATA */
 692                 i=s->handshake_func(s);
 693                 if (i < 0) return(i);
 694                 if (i == 0)
 695                         {
 696                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 697                         return(-1);
 698                         }
 699                 }
 700
 701 start:
 702         s->rwstate=SSL_NOTHING;
 703
 704         /* s->s3->rrec.type         - is the type of record
 705          * s->s3->rrec.data,    - data
 706          * s->s3->rrec.off,     - offset into 'data' for next read
 707          * s->s3->rrec.length,  - number of bytes. */
 708         rr = &(s->s3->rrec);
 709
 710         /* get new packet if necessary */
 711         if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY))
 712                 {
 713                 ret=dtls1_get_record(s);
 714                 if (ret <= 0)
 715                         {
 716                         ret = dtls1_read_failed(s, ret);
 717                         /* anything other than a timeout is an error */
 718                         if (ret <= 0)
 719                                 return(ret);
 720                         else
 721                                 goto start;
 722                         }
 723                 }
 724
 725         /* we now have a packet which can be read and processed */
 726
 727         if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec,
 728                                        * reset by ssl3_get_finished */
 729                 && (rr->type != SSL3_RT_HANDSHAKE))
 730                 {
 731                 al=SSL_AD_UNEXPECTED_MESSAGE;
 732                 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_DATA_BETWEEN_CCS_AND_FINISHED);
 733                 goto err;
 734                 }
 735
 736         /* If the other end has shut down, throw anything we read away
 737          * (even in 'peek' mode) */
 738         if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
 739                 {
 740                 rr->length=0;
 741                 s->rwstate=SSL_NOTHING;
 742                 return(0);
 743                 }
 744
 745
 746         if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */
 747                 {
 748                 /* make sure that we are not getting application data when we
 749                  * are doing a handshake for the first time */
 750                 if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
 751                         (s->enc_read_ctx == NULL))
 752                         {
 753                         al=SSL_AD_UNEXPECTED_MESSAGE;
 754                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE);
 755                         goto f_err;
 756                         }
 757
 758                 if (len <= 0) return(len);
 759
 760                 if ((unsigned int)len > rr->length)
 761                         n = rr->length;
 762                 else
 763                         n = (unsigned int)len;
 764
 765                 memcpy(buf,&(rr->data[rr->off]),n);
 766                 if (!peek)
 767                         {
 768                         rr->length-=n;
 769                         rr->off+=n;
 770                         if (rr->length == 0)
 771                                 {
 772                                 s->rstate=SSL_ST_READ_HEADER;
 773                                 rr->off=0;
 774                                 }
 775                         }
 776                 return(n);
 777                 }
 778
 779
 780         /* If we get here, then type != rr->type; if we have a handshake
 781          * message, then it was unexpected (Hello Request or Client Hello). */
 782
 783         /* In case of record types for which we have 'fragment' storage,
 784          * fill that so that we can process the data at a fixed place.
 785          */
 786                 {
 787                 unsigned int k, dest_maxlen = 0;
 788                 unsigned char *dest = NULL;
 789                 unsigned int *dest_len = NULL;
 790
 791                 if (rr->type == SSL3_RT_HANDSHAKE)
 792                         {
 793                         dest_maxlen = sizeof s->d1->handshake_fragment;
 794                         dest = s->d1->handshake_fragment;
 795                         dest_len = &s->d1->handshake_fragment_len;
 796                         }
 797                 else if (rr->type == SSL3_RT_ALERT)
 798                         {
 799                         dest_maxlen = sizeof(s->d1->alert_fragment);
 800                         dest = s->d1->alert_fragment;
 801                         dest_len = &s->d1->alert_fragment_len;
 802                         }
 803                 /* else it's a CCS message, or it's wrong */
 804                 else if (rr->type != SSL3_RT_CHANGE_CIPHER_SPEC)
 805                         {
 806                           /* Not certain if this is the right error handling */
 807                           al=SSL_AD_UNEXPECTED_MESSAGE;
 808                           SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
 809                           goto f_err;
 810                         }
 811
 812
 813                 if (dest_maxlen > 0)
 814                         {
 815             /* XDTLS:  In a pathalogical case, the Client Hello
 816              *  may be fragmented--don't always expect dest_maxlen bytes */
 817                         if ( rr->length < dest_maxlen)
 818                                 {
 819 #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
 820                                 /*
 821                                  * for normal alerts rr->length is 2, while
 822                                  * dest_maxlen is 7 if we were to handle this
 823                                  * non-existing alert...
 824                                  */
 825                                 FIX ME
 826 #endif
 827                                 s->rstate=SSL_ST_READ_HEADER;
 828                                 rr->length = 0;
 829                                 goto start;
 830                                 }
 831
 832                         /* now move 'n' bytes: */
 833                         for ( k = 0; k < dest_maxlen; k++)
 834                                 {
 835                                 dest[k] = rr->data[rr->off++];
 836                                 rr->length--;
 837                                 }
 838                         *dest_len = dest_maxlen;
 839                         }
 840                 }
 841
 842         /* s->d1->handshake_fragment_len == 12  iff  rr->type == SSL3_RT_HANDSHAKE;
 843          * s->d1->alert_fragment_len == 7      iff  rr->type == SSL3_RT_ALERT.
 844          * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */
 845
 846         /* If we are a client, check for an incoming 'Hello Request': */
 847         if ((!s->server) &&
 848                 (s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) &&
 849                 (s->d1->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
 850                 (s->session != NULL) && (s->session->cipher != NULL))
 851                 {
 852                 s->d1->handshake_fragment_len = 0;
 853
 854                 if ((s->d1->handshake_fragment[1] != 0) ||
 855                         (s->d1->handshake_fragment[2] != 0) ||
 856                         (s->d1->handshake_fragment[3] != 0))
 857                         {
 858                         al=SSL_AD_DECODE_ERROR;
 859                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_BAD_HELLO_REQUEST);
 860                         goto err;
 861                         }
 862
 863                 /* no need to check sequence number on HELLO REQUEST messages */
 864
 865                 if (s->msg_callback)
 866                         s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,
 867                                 s->d1->handshake_fragment, 4, s, s->msg_callback_arg);
 868
 869                 if (SSL_is_init_finished(s) &&
 870                         !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
 871                         !s->s3->renegotiate)
 872                         {
 873                         ssl3_renegotiate(s);
 874                         if (ssl3_renegotiate_check(s))
 875                                 {
 876                                 i=s->handshake_func(s);
 877                                 if (i < 0) return(i);
 878                                 if (i == 0)
 879                                         {
 880                                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 881                                         return(-1);
 882                                         }
 883
 884                                 if (!(s->mode & SSL_MODE_AUTO_RETRY))
 885                                         {
 886                                         if (s->s3->rbuf.left == 0) /* no read-ahead left? */
 887                                                 {
 888                                                 BIO *bio;
 889                                                 /* In the case where we try to read application data,
 890                                                  * but we trigger an SSL handshake, we return -1 with
 891                                                  * the retry option set.  Otherwise renegotiation may
 892                                                  * cause nasty problems in the blocking world */
 893                                                 s->rwstate=SSL_READING;
 894                                                 bio=SSL_get_rbio(s);
 895                                                 BIO_clear_retry_flags(bio);
 896                                                 BIO_set_retry_read(bio);
 897                                                 return(-1);
 898                                                 }
 899                                         }
 900                                 }
 901                         }
 902                 /* we either finished a handshake or ignored the request,
 903                  * now try again to obtain the (application) data we were asked for */
 904                 goto start;
 905                 }
 906
 907         if (s->d1->alert_fragment_len >= DTLS1_AL_HEADER_LENGTH)
 908                 {
 909                 int alert_level = s->d1->alert_fragment[0];
 910                 int alert_descr = s->d1->alert_fragment[1];
 911
 912                 s->d1->alert_fragment_len = 0;
 913
 914                 if (s->msg_callback)
 915                         s->msg_callback(0, s->version, SSL3_RT_ALERT,
 916                                 s->d1->alert_fragment, 2, s, s->msg_callback_arg);
 917
 918                 if (s->info_callback != NULL)
 919                         cb=s->info_callback;
 920                 else if (s->ctx->info_callback != NULL)
 921                         cb=s->ctx->info_callback;
 922
 923                 if (cb != NULL)
 924                         {
 925                         j = (alert_level << 8) | alert_descr;
 926                         cb(s, SSL_CB_READ_ALERT, j);
 927                         }
 928
 929                 if (alert_level == 1) /* warning */
 930                         {
 931                         s->s3->warn_alert = alert_descr;
 932                         if (alert_descr == SSL_AD_CLOSE_NOTIFY)
 933                                 {
 934                                 s->shutdown |= SSL_RECEIVED_SHUTDOWN;
 935                                 return(0);
 936                                 }
 937 #if 0
 938             /* XXX: this is a possible improvement in the future */
 939                         /* now check if it's a missing record */
 940                         if (alert_descr == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE)
 941                                 {
 942                                 unsigned short seq;
 943                                 unsigned int frag_off;
 944                                 unsigned char *p = &(s->d1->alert_fragment[2]);
 945
 946                                 n2s(p, seq);
 947                                 n2l3(p, frag_off);
 948
 949                                 dtls1_retransmit_message(s, seq, frag_off, &found);
 950                                 if ( ! found  && SSL_in_init(s))
 951                                         {
 952                                         /* fprintf( stderr,"in init = %d\n", SSL_in_init(s)); */
 953                                         /* requested a message not yet sent,
 954                                            send an alert ourselves */
 955                                         ssl3_send_alert(s,SSL3_AL_WARNING,
 956                                                 DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);
 957                                         }
 958                                 }
 959 #endif
 960                         }
 961                 else if (alert_level == 2) /* fatal */
 962                         {
 963                         char tmp[16];
 964
 965                         s->rwstate=SSL_NOTHING;
 966                         s->s3->fatal_alert = alert_descr;
 967                         SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr);
 968                         BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr);
 969                         ERR_add_error_data(2,"SSL alert number ",tmp);
 970                         s->shutdown|=SSL_RECEIVED_SHUTDOWN;
 971                         SSL_CTX_remove_session(s->ctx,s->session);
 972                         return(0);
 973                         }
 974                 else
 975                         {
 976                         al=SSL_AD_ILLEGAL_PARAMETER;
 977                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE);
 978                         goto f_err;
 979                         }
 980
 981                 goto start;
 982                 }
 983
 984         if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */
 985                 {
 986                 s->rwstate=SSL_NOTHING;
 987                 rr->length=0;
 988                 return(0);
 989                 }
 990
 991         if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
 992                 {
 993                 struct ccs_header_st ccs_hdr;
 994
 995                 dtls1_get_ccs_header(rr->data, &ccs_hdr);
 996
 997                 /* 'Change Cipher Spec' is just a single byte, so we know
 998                  * exactly what the record payload has to look like */
 999                 /* XDTLS: check that epoch is consistent */
1000                 if (    (s->client_version == DTLS1_BAD_VER && rr->length != 3) ||
1001                         (s->client_version != DTLS1_BAD_VER && rr->length != DTLS1_CCS_HEADER_LENGTH) ||
1002                         (rr->off != 0) || (rr->data[0] != SSL3_MT_CCS))
1003                         {
1004                         i=SSL_AD_ILLEGAL_PARAMETER;
1005                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
1006                         goto err;
1007                         }
1008
1009                 rr->length=0;
1010
1011                 if (s->msg_callback)
1012                         s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC,
1013                                 rr->data, 1, s, s->msg_callback_arg);
1014
1015                 s->s3->change_cipher_spec=1;
1016                 if (!ssl3_do_change_cipher_spec(s))
1017                         goto err;
1018
1019                 /* do this whenever CCS is processed */
1020                 dtls1_reset_seq_numbers(s, SSL3_CC_READ);
1021
1022                 if (s->client_version == DTLS1_BAD_VER)
1023                         s->d1->handshake_read_seq++;
1024
1025                 goto start;
1026                 }
1027
1028         /* Unexpected handshake message (Client Hello, or protocol violation) */
1029         if ((s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) &&
1030                 !s->in_handshake)
1031                 {
1032                 struct hm_header_st msg_hdr;
1033
1034                 /* this may just be a stale retransmit */
1035                 dtls1_get_message_header(rr->data, &msg_hdr);
1036                 if( rr->epoch != s->d1->r_epoch)
1037                         {
1038                         rr->length = 0;
1039                         goto start;
1040                         }
1041
1042                 if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
1043                         !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
1044                         {
1045 #if 0 /* worked only because C operator preferences are not as expected (and
1046        * because this is not really needed for clients except for detecting
1047        * protocol violations): */
1048                         s->state=SSL_ST_BEFORE|(s->server)
1049                                 ?SSL_ST_ACCEPT
1050                                 :SSL_ST_CONNECT;
1051 #else
1052                         s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT;
1053 #endif
1054                         s->new_session=1;
1055                         }
1056                 i=s->handshake_func(s);
1057                 if (i < 0) return(i);
1058                 if (i == 0)
1059                         {
1060                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1061                         return(-1);
1062                         }
1063
1064                 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1065                         {
1066                         if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1067                                 {
1068                                 BIO *bio;
1069                                 /* In the case where we try to read application data,
1070                                  * but we trigger an SSL handshake, we return -1 with
1071                                  * the retry option set.  Otherwise renegotiation may
1072                                  * cause nasty problems in the blocking world */
1073                                 s->rwstate=SSL_READING;
1074                                 bio=SSL_get_rbio(s);
1075                                 BIO_clear_retry_flags(bio);
1076                                 BIO_set_retry_read(bio);
1077                                 return(-1);
1078                                 }
1079                         }
1080                 goto start;
1081                 }
1082
1083         switch (rr->type)
1084                 {
1085         default:
1086 #ifndef OPENSSL_NO_TLS
1087                 /* TLS just ignores unknown message types */
1088                 if (s->version == TLS1_VERSION)
1089                         {
1090                         rr->length = 0;
1091                         goto start;
1092                         }
1093 #endif
1094                 al=SSL_AD_UNEXPECTED_MESSAGE;
1095                 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1096                 goto f_err;
1097         case SSL3_RT_CHANGE_CIPHER_SPEC:
1098         case SSL3_RT_ALERT:
1099         case SSL3_RT_HANDSHAKE:
1100                 /* we already handled all of these, with the possible exception
1101                  * of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that
1102                  * should not happen when type != rr->type */
1103                 al=SSL_AD_UNEXPECTED_MESSAGE;
1104                 SSLerr(SSL_F_DTLS1_READ_BYTES,ERR_R_INTERNAL_ERROR);
1105                 goto f_err;
1106         case SSL3_RT_APPLICATION_DATA:
1107                 /* At this point, we were expecting handshake data,
1108                  * but have application data.  If the library was
1109                  * running inside ssl3_read() (i.e. in_read_app_data
1110                  * is set) and it makes sense to read application data
1111                  * at this point (session renegotiation not yet started),
1112                  * we will indulge it.
1113                  */
1114                 if (s->s3->in_read_app_data &&
1115                         (s->s3->total_renegotiations != 0) &&
1116                         ((
1117                                 (s->state & SSL_ST_CONNECT) &&
1118                                 (s->state >= SSL3_ST_CW_CLNT_HELLO_A) &&
1119                                 (s->state <= SSL3_ST_CR_SRVR_HELLO_A)
1120                                 ) || (
1121                                         (s->state & SSL_ST_ACCEPT) &&
1122                                         (s->state <= SSL3_ST_SW_HELLO_REQ_A) &&
1123                                         (s->state >= SSL3_ST_SR_CLNT_HELLO_A)
1124                                         )
1125                                 ))
1126                         {
1127                         s->s3->in_read_app_data=2;
1128                         return(-1);
1129                         }
1130                 else
1131                         {
1132                         al=SSL_AD_UNEXPECTED_MESSAGE;
1133                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1134                         goto f_err;
1135                         }
1136                 }
1137         /* not reached */
1138
1139 f_err:
1140         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1141 err:
1142         return(-1);
1143         }
1144
1145 int
1146 dtls1_write_app_data_bytes(SSL *s, int type, const void *buf_, int len)
1147         {
1148         unsigned int n,tot;
1149         int i;
1150
1151         if (SSL_in_init(s) && !s->in_handshake)
1152                 {
1153                 i=s->handshake_func(s);
1154                 if (i < 0) return(i);
1155                 if (i == 0)
1156                         {
1157                         SSLerr(SSL_F_DTLS1_WRITE_APP_DATA_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1158                         return -1;
1159                         }
1160                 }
1161
1162         tot = s->s3->wnum;
1163         n = len - tot;
1164
1165         while( n)
1166                 {
1167                 /* dtls1_write_bytes sends one record at a time, sized according to
1168                  * the currently known MTU */
1169                 i = dtls1_write_bytes(s, type, buf_, len);
1170                 if (i <= 0) return i;
1171
1172                 if ((i == (int)n) ||
1173                         (type == SSL3_RT_APPLICATION_DATA &&
1174                                 (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE)))
1175                         {
1176                         /* next chunk of data should get another prepended empty fragment
1177                          * in ciphersuites with known-IV weakness: */
1178                         s->s3->empty_fragment_done = 0;
1179                         return tot+i;
1180                         }
1181
1182                 tot += i;
1183                 n-=i;
1184                 }
1185
1186         return tot;
1187         }
1188
1189
1190         /* this only happens when a client hello is received and a handshake
1191          * is started. */
1192 static int
1193 have_handshake_fragment(SSL *s, int type, unsigned char *buf,
1194         int len, int peek)
1195         {
1196
1197         if ((type == SSL3_RT_HANDSHAKE) && (s->d1->handshake_fragment_len > 0))
1198                 /* (partially) satisfy request from storage */
1199                 {
1200                 unsigned char *src = s->d1->handshake_fragment;
1201                 unsigned char *dst = buf;
1202                 unsigned int k,n;
1203
1204                 /* peek == 0 */
1205                 n = 0;
1206                 while ((len > 0) && (s->d1->handshake_fragment_len > 0))
1207                         {
1208                         *dst++ = *src++;
1209                         len--; s->d1->handshake_fragment_len--;
1210                         n++;
1211                         }
1212                 /* move any remaining fragment bytes: */
1213                 for (k = 0; k < s->d1->handshake_fragment_len; k++)
1214                         s->d1->handshake_fragment[k] = *src++;
1215                 return n;
1216                 }
1217
1218         return 0;
1219         }
1220
1221
1222
1223
1224 /* Call this to write data in records of type 'type'
1225  * It will return <= 0 if not all data has been sent or non-blocking IO.
1226  */
1227 int dtls1_write_bytes(SSL *s, int type, const void *buf_, int len)
1228         {
1229         const unsigned char *buf=buf_;
1230         unsigned int tot,n,nw;
1231         int i;
1232         unsigned int mtu;
1233
1234         s->rwstate=SSL_NOTHING;
1235         tot=s->s3->wnum;
1236
1237         n=(len-tot);
1238
1239         /* handshake layer figures out MTU for itself, but data records
1240          * are also sent through this interface, so need to figure out MTU */
1241 #if 0
1242         mtu = BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_GET_MTU, 0, NULL);
1243         mtu += DTLS1_HM_HEADER_LENGTH;  /* HM already inserted */
1244 #endif
1245         mtu = s->d1->mtu;
1246
1247         if (mtu > SSL3_RT_MAX_PLAIN_LENGTH)
1248                 mtu = SSL3_RT_MAX_PLAIN_LENGTH;
1249
1250         if (n > mtu)
1251                 nw=mtu;
1252         else
1253                 nw=n;
1254
1255         i=do_dtls1_write(s, type, &(buf[tot]), nw, 0);
1256         if (i <= 0)
1257                 {
1258                 s->s3->wnum=tot;
1259                 return i;
1260                 }
1261
1262         if ( (int)s->s3->wnum + i == len)
1263                 s->s3->wnum = 0;
1264         else
1265                 s->s3->wnum += i;
1266
1267         return i;
1268         }
1269
1270 int do_dtls1_write(SSL *s, int type, const unsigned char *buf, unsigned int len, int create_empty_fragment)
1271         {
1272         unsigned char *p,*pseq;
1273         int i,mac_size,clear=0;
1274         int prefix_len = 0;
1275         SSL3_RECORD *wr;
1276         SSL3_BUFFER *wb;
1277         SSL_SESSION *sess;
1278         int bs;
1279
1280         /* first check if there is a SSL3_BUFFER still being written
1281          * out.  This will happen with non blocking IO */
1282         if (s->s3->wbuf.left != 0)
1283                 {
1284                 OPENSSL_assert(0); /* XDTLS:  want to see if we ever get here */
1285                 return(ssl3_write_pending(s,type,buf,len));
1286                 }
1287
1288         /* If we have an alert to send, lets send it */
1289         if (s->s3->alert_dispatch)
1290                 {
1291                 i=s->method->ssl_dispatch_alert(s);
1292                 if (i <= 0)
1293                         return(i);
1294                 /* if it went, fall through and send more stuff */
1295                 }
1296
1297         if (len == 0 && !create_empty_fragment)
1298                 return 0;
1299
1300         wr= &(s->s3->wrec);
1301         wb= &(s->s3->wbuf);
1302         sess=s->session;
1303
1304         if (    (sess == NULL) ||
1305                 (s->enc_write_ctx == NULL) ||
1306                 (s->write_hash == NULL))
1307                 clear=1;
1308
1309         if (clear)
1310                 mac_size=0;
1311         else
1312                 mac_size=EVP_MD_size(s->write_hash);
1313
1314         /* DTLS implements explicit IV, so no need for empty fragments */
1315 #if 0
1316         /* 'create_empty_fragment' is true only when this function calls itself */
1317         if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done
1318                 && SSL_version(s) != DTLS1_VERSION)
1319                 {
1320                 /* countermeasure against known-IV weakness in CBC ciphersuites
1321                  * (see http://www.openssl.org/~bodo/tls-cbc.txt)
1322                  */
1323
1324                 if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA)
1325                         {
1326                         /* recursive function call with 'create_empty_fragment' set;
1327                          * this prepares and buffers the data for an empty fragment
1328                          * (these 'prefix_len' bytes are sent out later
1329                          * together with the actual payload) */
1330                         prefix_len = s->method->do_ssl_write(s, type, buf, 0, 1);
1331                         if (prefix_len <= 0)
1332                                 goto err;
1333
1334                         if (s->s3->wbuf.len < (size_t)prefix_len + SSL3_RT_MAX_PACKET_SIZE)
1335                                 {
1336                                 /* insufficient space */
1337                                 SSLerr(SSL_F_DO_DTLS1_WRITE, ERR_R_INTERNAL_ERROR);
1338                                 goto err;
1339                                 }
1340                         }
1341
1342                 s->s3->empty_fragment_done = 1;
1343                 }
1344 #endif
1345
1346         p = wb->buf + prefix_len;
1347
1348         /* write the header */
1349
1350         *(p++)=type&0xff;
1351         wr->type=type;
1352
1353         if (s->client_version == DTLS1_BAD_VER)
1354                 *(p++) = DTLS1_BAD_VER>>8,
1355                 *(p++) = DTLS1_BAD_VER&0xff;
1356         else
1357                 *(p++)=(s->version>>8),
1358                 *(p++)=s->version&0xff;
1359
1360         /* field where we are to write out packet epoch, seq num and len */
1361         pseq=p;
1362         p+=10;
1363
1364         /* lets setup the record stuff. */
1365
1366         /* Make space for the explicit IV in case of CBC.
1367          * (this is a bit of a boundary violation, but what the heck).
1368          */
1369         if ( s->enc_write_ctx &&
1370                 (EVP_CIPHER_mode( s->enc_write_ctx->cipher ) & EVP_CIPH_CBC_MODE))
1371                 bs = EVP_CIPHER_block_size(s->enc_write_ctx->cipher);
1372         else
1373                 bs = 0;
1374
1375         wr->data=p + bs;  /* make room for IV in case of CBC */
1376         wr->length=(int)len;
1377         wr->input=(unsigned char *)buf;
1378
1379         /* we now 'read' from wr->input, wr->length bytes into
1380          * wr->data */
1381
1382         /* first we compress */
1383         if (s->compress != NULL)
1384                 {
1385                 if (!ssl3_do_compress(s))
1386                         {
1387                         SSLerr(SSL_F_DO_DTLS1_WRITE,SSL_R_COMPRESSION_FAILURE);
1388                         goto err;
1389                         }
1390                 }
1391         else
1392                 {
1393                 memcpy(wr->data,wr->input,wr->length);
1394                 wr->input=wr->data;
1395                 }
1396
1397         /* we should still have the output to wr->data and the input
1398          * from wr->input.  Length should be wr->length.
1399          * wr->data still points in the wb->buf */
1400
1401         if (mac_size != 0)
1402                 {
1403                 s->method->ssl3_enc->mac(s,&(p[wr->length + bs]),1);
1404                 wr->length+=mac_size;
1405                 }
1406
1407         /* this is true regardless of mac size */
1408         wr->input=p;
1409         wr->data=p;
1410
1411
1412         /* ssl3_enc can only have an error on read */
1413         if (bs) /* bs != 0 in case of CBC */
1414                 {
1415                 RAND_pseudo_bytes(p,bs);
1416                 /* master IV and last CBC residue stand for
1417                  * the rest of randomness */
1418                 wr->length += bs;
1419                 }
1420
1421         s->method->ssl3_enc->enc(s,1);
1422
1423         /* record length after mac and block padding */
1424 /*      if (type == SSL3_RT_APPLICATION_DATA ||
1425         (type == SSL3_RT_ALERT && ! SSL_in_init(s))) */
1426
1427         /* there's only one epoch between handshake and app data */
1428
1429         s2n(s->d1->w_epoch, pseq);
1430
1431         /* XDTLS: ?? */
1432 /*      else
1433         s2n(s->d1->handshake_epoch, pseq); */
1434
1435         memcpy(pseq, &(s->s3->write_sequence[2]), 6);
1436         pseq+=6;
1437         s2n(wr->length,pseq);
1438
1439         /* we should now have
1440          * wr->data pointing to the encrypted data, which is
1441          * wr->length long */
1442         wr->type=type; /* not needed but helps for debugging */
1443         wr->length+=DTLS1_RT_HEADER_LENGTH;
1444
1445 #if 0  /* this is now done at the message layer */
1446         /* buffer the record, making it easy to handle retransmits */
1447         if ( type == SSL3_RT_HANDSHAKE || type == SSL3_RT_CHANGE_CIPHER_SPEC)
1448                 dtls1_buffer_record(s, wr->data, wr->length,
1449                         *((PQ_64BIT *)&(s->s3->write_sequence[0])));
1450 #endif
1451
1452         ssl3_record_sequence_update(&(s->s3->write_sequence[0]));
1453
1454         if (create_empty_fragment)
1455                 {
1456                 /* we are in a recursive call;
1457                  * just return the length, don't write out anything here
1458                  */
1459                 return wr->length;
1460                 }
1461
1462         /* now let's set up wb */
1463         wb->left = prefix_len + wr->length;
1464         wb->offset = 0;
1465
1466         /* memorize arguments so that ssl3_write_pending can detect bad write retries later */
1467         s->s3->wpend_tot=len;
1468         s->s3->wpend_buf=buf;
1469         s->s3->wpend_type=type;
1470         s->s3->wpend_ret=len;
1471
1472         /* we now just need to write the buffer */
1473         return ssl3_write_pending(s,type,buf,len);
1474 err:
1475         return -1;
1476         }
1477
1478
1479
1480 static int dtls1_record_replay_check(SSL *s, DTLS1_BITMAP *bitmap,
1481         PQ_64BIT *seq_num)
1482         {
1483 #if PQ_64BIT_IS_INTEGER
1484         PQ_64BIT mask = 0x0000000000000001L;
1485 #endif
1486         PQ_64BIT rcd_num, tmp;
1487
1488         pq_64bit_init(&rcd_num);
1489         pq_64bit_init(&tmp);
1490
1491         /* this is the sequence number for the record just read */
1492         pq_64bit_bin2num(&rcd_num, s->s3->read_sequence, 8);
1493
1494
1495         if (pq_64bit_gt(&rcd_num, &(bitmap->max_seq_num)) ||
1496                 pq_64bit_eq(&rcd_num, &(bitmap->max_seq_num)))
1497                 {
1498                 pq_64bit_assign(seq_num, &rcd_num);
1499                 pq_64bit_free(&rcd_num);
1500                 pq_64bit_free(&tmp);
1501                 return 1;  /* this record is new */
1502                 }
1503
1504         pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num);
1505
1506         if ( pq_64bit_get_word(&tmp) > bitmap->length)
1507                 {
1508                 pq_64bit_free(&rcd_num);
1509                 pq_64bit_free(&tmp);
1510                 return 0;  /* stale, outside the window */
1511                 }
1512
1513 #if PQ_64BIT_IS_BIGNUM
1514         {
1515         int offset;
1516         pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num);
1517         pq_64bit_sub_word(&tmp, 1);
1518         offset = pq_64bit_get_word(&tmp);
1519         if ( pq_64bit_is_bit_set(&(bitmap->map), offset))
1520                 {
1521                 pq_64bit_free(&rcd_num);
1522                 pq_64bit_free(&tmp);
1523                 return 0;
1524                 }
1525         }
1526 #else
1527         mask <<= (bitmap->max_seq_num - rcd_num - 1);
1528         if (bitmap->map & mask)
1529                 return 0; /* record previously received */
1530 #endif
1531
1532         pq_64bit_assign(seq_num, &rcd_num);
1533         pq_64bit_free(&rcd_num);
1534         pq_64bit_free(&tmp);
1535         return 1;
1536         }
1537
1538
1539 static void dtls1_record_bitmap_update(SSL *s, DTLS1_BITMAP *bitmap)
1540         {
1541         unsigned int shift;
1542         PQ_64BIT rcd_num;
1543         PQ_64BIT tmp;
1544         PQ_64BIT_CTX *ctx;
1545
1546         pq_64bit_init(&rcd_num);
1547         pq_64bit_init(&tmp);
1548
1549         pq_64bit_bin2num(&rcd_num, s->s3->read_sequence, 8);
1550
1551         /* unfortunate code complexity due to 64-bit manipulation support
1552          * on 32-bit machines */
1553         if ( pq_64bit_gt(&rcd_num, &(bitmap->max_seq_num)) ||
1554                 pq_64bit_eq(&rcd_num, &(bitmap->max_seq_num)))
1555                 {
1556                 pq_64bit_sub(&tmp, &rcd_num, &(bitmap->max_seq_num));
1557                 pq_64bit_add_word(&tmp, 1);
1558
1559                 shift = (unsigned int)pq_64bit_get_word(&tmp);
1560
1561                 pq_64bit_lshift(&(tmp), &(bitmap->map), shift);
1562                 pq_64bit_assign(&(bitmap->map), &tmp);
1563
1564                 pq_64bit_set_bit(&(bitmap->map), 0);
1565                 pq_64bit_add_word(&rcd_num, 1);
1566                 pq_64bit_assign(&(bitmap->max_seq_num), &rcd_num);
1567
1568                 pq_64bit_assign_word(&tmp, 1);
1569                 pq_64bit_lshift(&tmp, &tmp, bitmap->length);
1570                 ctx = pq_64bit_ctx_new(&ctx);
1571                 pq_64bit_mod(&(bitmap->map), &(bitmap->map), &tmp, ctx);
1572                 pq_64bit_ctx_free(ctx);
1573                 }
1574         else
1575                 {
1576                 pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num);
1577                 pq_64bit_sub_word(&tmp, 1);
1578                 shift = (unsigned int)pq_64bit_get_word(&tmp);
1579
1580                 pq_64bit_set_bit(&(bitmap->map), shift);
1581                 }
1582
1583         pq_64bit_free(&rcd_num);
1584         pq_64bit_free(&tmp);
1585         }
1586
1587
1588 int dtls1_dispatch_alert(SSL *s)
1589         {
1590         int i,j;
1591         void (*cb)(const SSL *ssl,int type,int val)=NULL;
1592         unsigned char buf[DTLS1_AL_HEADER_LENGTH];
1593         unsigned char *ptr = &buf[0];
1594
1595         s->s3->alert_dispatch=0;
1596
1597         memset(buf, 0x00, sizeof(buf));
1598         *ptr++ = s->s3->send_alert[0];
1599         *ptr++ = s->s3->send_alert[1];
1600
1601 #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
1602         if (s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE)
1603                 {
1604                 s2n(s->d1->handshake_read_seq, ptr);
1605 #if 0
1606                 if ( s->d1->r_msg_hdr.frag_off == 0)  /* waiting for a new msg */
1607
1608                 else
1609                         s2n(s->d1->r_msg_hdr.seq, ptr); /* partial msg read */
1610 #endif
1611
1612 #if 0
1613                 fprintf(stderr, "s->d1->handshake_read_seq = %d, s->d1->r_msg_hdr.seq = %d\n",s->d1->handshake_read_seq,s->d1->r_msg_hdr.seq);
1614 #endif
1615                 l2n3(s->d1->r_msg_hdr.frag_off, ptr);
1616                 }
1617 #endif
1618
1619         i = do_dtls1_write(s, SSL3_RT_ALERT, &buf[0], sizeof(buf), 0);
1620         if (i <= 0)
1621                 {
1622                 s->s3->alert_dispatch=1;
1623                 /* fprintf( stderr, "not done with alert\n" ); */
1624                 }
1625         else
1626                 {
1627                 if (s->s3->send_alert[0] == SSL3_AL_FATAL
1628 #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
1629                     || s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
1630 #endif
1631                    )
1632                         (void)BIO_flush(s->wbio);
1633
1634                 if (s->msg_callback)
1635                         s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert,
1636                                 2, s, s->msg_callback_arg);
1637
1638                 if (s->info_callback != NULL)
1639                         cb=s->info_callback;
1640                 else if (s->ctx->info_callback != NULL)
1641                         cb=s->ctx->info_callback;
1642
1643                 if (cb != NULL)
1644                         {
1645                         j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
1646                         cb(s,SSL_CB_WRITE_ALERT,j);
1647                         }
1648                 }
1649         return(i);
1650         }
1651
1652
1653 static DTLS1_BITMAP *
1654 dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr, unsigned int *is_next_epoch)
1655     {
1656
1657     *is_next_epoch = 0;
1658
1659     /* In current epoch, accept HM, CCS, DATA, & ALERT */
1660     if (rr->epoch == s->d1->r_epoch)
1661         return &s->d1->bitmap;
1662
1663     /* Only HM and ALERT messages can be from the next epoch */
1664     else if (rr->epoch == (unsigned long)(s->d1->r_epoch + 1) &&
1665         (rr->type == SSL3_RT_HANDSHAKE ||
1666             rr->type == SSL3_RT_ALERT))
1667         {
1668         *is_next_epoch = 1;
1669         return &s->d1->next_bitmap;
1670         }
1671
1672     return NULL;
1673     }
1674
1675 #if 0
1676 static int
1677 dtls1_record_needs_buffering(SSL *s, SSL3_RECORD *rr, unsigned short *priority,
1678         unsigned long *offset)
1679         {
1680
1681         /* alerts are passed up immediately */
1682         if ( rr->type == SSL3_RT_APPLICATION_DATA ||
1683                 rr->type == SSL3_RT_ALERT)
1684                 return 0;
1685
1686         /* Only need to buffer if a handshake is underway.
1687          * (this implies that Hello Request and Client Hello are passed up
1688          * immediately) */
1689         if ( SSL_in_init(s))
1690                 {
1691                 unsigned char *data = rr->data;
1692                 /* need to extract the HM/CCS sequence number here */
1693                 if ( rr->type == SSL3_RT_HANDSHAKE ||
1694                         rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
1695                         {
1696                         unsigned short seq_num;
1697                         struct hm_header_st msg_hdr;
1698                         struct ccs_header_st ccs_hdr;
1699
1700                         if ( rr->type == SSL3_RT_HANDSHAKE)
1701                                 {
1702                                 dtls1_get_message_header(data, &msg_hdr);
1703                                 seq_num = msg_hdr.seq;
1704                                 *offset = msg_hdr.frag_off;
1705                                 }
1706                         else
1707                                 {
1708                                 dtls1_get_ccs_header(data, &ccs_hdr);
1709                                 seq_num = ccs_hdr.seq;
1710                                 *offset = 0;
1711                                 }
1712
1713                         /* this is either a record we're waiting for, or a
1714                          * retransmit of something we happened to previously
1715                          * receive (higher layers will drop the repeat silently */
1716                         if ( seq_num < s->d1->handshake_read_seq)
1717                                 return 0;
1718                         if (rr->type == SSL3_RT_HANDSHAKE &&
1719                                 seq_num == s->d1->handshake_read_seq &&
1720                                 msg_hdr.frag_off < s->d1->r_msg_hdr.frag_off)
1721                                 return 0;
1722                         else if ( seq_num == s->d1->handshake_read_seq &&
1723                                 (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC ||
1724                                         msg_hdr.frag_off == s->d1->r_msg_hdr.frag_off))
1725                                 return 0;
1726                         else
1727                                 {
1728                                 *priority = seq_num;
1729                                 return 1;
1730                                 }
1731                         }
1732                 else /* unknown record type */
1733                         return 0;
1734                 }
1735
1736         return 0;
1737         }
1738 #endif
1739
1740 void
1741 dtls1_reset_seq_numbers(SSL *s, int rw)
1742         {
1743         unsigned char *seq;
1744         unsigned int seq_bytes = sizeof(s->s3->read_sequence);
1745
1746         if ( rw & SSL3_CC_READ)
1747                 {
1748                 seq = s->s3->read_sequence;
1749                 s->d1->r_epoch++;
1750
1751                 pq_64bit_assign(&(s->d1->bitmap.map), &(s->d1->next_bitmap.map));
1752                 s->d1->bitmap.length = s->d1->next_bitmap.length;
1753                 pq_64bit_assign(&(s->d1->bitmap.max_seq_num),
1754                         &(s->d1->next_bitmap.max_seq_num));
1755
1756                 pq_64bit_free(&(s->d1->next_bitmap.map));
1757                 pq_64bit_free(&(s->d1->next_bitmap.max_seq_num));
1758                 memset(&(s->d1->next_bitmap), 0x00, sizeof(DTLS1_BITMAP));
1759                 pq_64bit_init(&(s->d1->next_bitmap.map));
1760                 pq_64bit_init(&(s->d1->next_bitmap.max_seq_num));
1761                 }
1762         else
1763                 {
1764                 seq = s->s3->write_sequence;
1765                 s->d1->w_epoch++;
1766                 }
1767
1768         memset(seq, 0x00, seq_bytes);
1769         }
1770
1771 #if PQ_64BIT_IS_INTEGER
1772 static PQ_64BIT
1773 bytes_to_long_long(unsigned char *bytes, PQ_64BIT *num)
1774        {
1775        PQ_64BIT _num;
1776
1777        _num = (((PQ_64BIT)bytes[0]) << 56) |
1778                (((PQ_64BIT)bytes[1]) << 48) |
1779                (((PQ_64BIT)bytes[2]) << 40) |
1780                (((PQ_64BIT)bytes[3]) << 32) |
1781                (((PQ_64BIT)bytes[4]) << 24) |
1782                (((PQ_64BIT)bytes[5]) << 16) |
1783                (((PQ_64BIT)bytes[6]) <<  8) |
1784                (((PQ_64BIT)bytes[7])      );
1785
1786            *num = _num ;
1787        return _num;
1788        }
1789 #endif
1790
1791
1792 static void
1793 dtls1_clear_timeouts(SSL *s)
1794         {
1795         memset(&(s->d1->timeout), 0x00, sizeof(struct dtls1_timeout_st));
1796         }