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         /* Set proper sequence number for mac calculation */
 161         memcpy(&(s->s3->read_sequence[2]), &(rdata->packet[5]), 6);
 162
 163     return(1);
 164     }
 165
 166
 167 static int
 168 dtls1_buffer_record(SSL *s, record_pqueue *queue, PQ_64BIT *priority)
 169 {
 170     DTLS1_RECORD_DATA *rdata;
 171         pitem *item;
 172
 173         /* Limit the size of the queue to prevent DOS attacks */
 174         if (pqueue_size(queue->q) >= 100)
 175                 return 0;
 176
 177         rdata = OPENSSL_malloc(sizeof(DTLS1_RECORD_DATA));
 178         item = pitem_new(*priority, rdata);
 179         if (rdata == NULL || item == NULL)
 180                 {
 181                 if (rdata != NULL) OPENSSL_free(rdata);
 182                 if (item != NULL) pitem_free(item);
 183
 184                 SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
 185                 return(0);
 186                 }
 187
 188         rdata->packet = s->packet;
 189         rdata->packet_length = s->packet_length;
 190         memcpy(&(rdata->rbuf), &(s->s3->rbuf), sizeof(SSL3_BUFFER));
 191         memcpy(&(rdata->rrec), &(s->s3->rrec), sizeof(SSL3_RECORD));
 192
 193         item->data = rdata;
 194
 195         /* insert should not fail, since duplicates are dropped */
 196         if (pqueue_insert(queue->q, item) == NULL)
 197                 {
 198                 OPENSSL_free(rdata);
 199                 pitem_free(item);
 200                 return(0);
 201                 }
 202
 203         s->packet = NULL;
 204         s->packet_length = 0;
 205         memset(&(s->s3->rbuf), 0, sizeof(SSL3_BUFFER));
 206         memset(&(s->s3->rrec), 0, sizeof(SSL3_RECORD));
 207
 208         if (!ssl3_setup_buffers(s))
 209                 {
 210                 SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
 211                 OPENSSL_free(rdata);
 212                 pitem_free(item);
 213                 return(0);
 214                 }
 215
 216         return(1);
 217     }
 218
 219
 220 static int
 221 dtls1_retrieve_buffered_record(SSL *s, record_pqueue *queue)
 222     {
 223     pitem *item;
 224
 225     item = pqueue_pop(queue->q);
 226     if (item)
 227         {
 228         dtls1_copy_record(s, item);
 229
 230         OPENSSL_free(item->data);
 231                 pitem_free(item);
 232
 233         return(1);
 234         }
 235
 236     return(0);
 237     }
 238
 239
 240 /* retrieve a buffered record that belongs to the new epoch, i.e., not processed
 241  * yet */
 242 #define dtls1_get_unprocessed_record(s) \
 243                    dtls1_retrieve_buffered_record((s), \
 244                    &((s)->d1->unprocessed_rcds))
 245
 246 /* retrieve a buffered record that belongs to the current epoch, ie, processed */
 247 #define dtls1_get_processed_record(s) \
 248                    dtls1_retrieve_buffered_record((s), \
 249                    &((s)->d1->processed_rcds))
 250
 251 static int
 252 dtls1_process_buffered_records(SSL *s)
 253     {
 254     pitem *item;
 255
 256     item = pqueue_peek(s->d1->unprocessed_rcds.q);
 257     if (item)
 258         {
 259         DTLS1_RECORD_DATA *rdata;
 260         rdata = (DTLS1_RECORD_DATA *)item->data;
 261
 262         /* Check if epoch is current. */
 263         if (s->d1->unprocessed_rcds.epoch != s->d1->r_epoch)
 264             return(1);  /* Nothing to do. */
 265
 266         /* Process all the records. */
 267         while (pqueue_peek(s->d1->unprocessed_rcds.q))
 268             {
 269             dtls1_get_unprocessed_record(s);
 270             if ( ! dtls1_process_record(s))
 271                 return(0);
 272             dtls1_buffer_record(s, &(s->d1->processed_rcds),
 273                 &s->s3->rrec.seq_num);
 274             }
 275         }
 276
 277     /* sync epoch numbers once all the unprocessed records
 278      * have been processed */
 279     s->d1->processed_rcds.epoch = s->d1->r_epoch;
 280     s->d1->unprocessed_rcds.epoch = s->d1->r_epoch + 1;
 281
 282     return(1);
 283     }
 284
 285
 286 #if 0
 287
 288 static int
 289 dtls1_get_buffered_record(SSL *s)
 290         {
 291         pitem *item;
 292         PQ_64BIT priority =
 293                 (((PQ_64BIT)s->d1->handshake_read_seq) << 32) |
 294                 ((PQ_64BIT)s->d1->r_msg_hdr.frag_off);
 295
 296         if ( ! SSL_in_init(s))  /* if we're not (re)negotiating,
 297                                                            nothing buffered */
 298                 return 0;
 299
 300
 301         item = pqueue_peek(s->d1->rcvd_records);
 302         if (item && item->priority == priority)
 303                 {
 304                 /* Check if we've received the record of interest.  It must be
 305                  * a handshake record, since data records as passed up without
 306                  * buffering */
 307                 DTLS1_RECORD_DATA *rdata;
 308                 item = pqueue_pop(s->d1->rcvd_records);
 309                 rdata = (DTLS1_RECORD_DATA *)item->data;
 310
 311                 if (s->s3->rbuf.buf != NULL)
 312                         OPENSSL_free(s->s3->rbuf.buf);
 313
 314                 s->packet = rdata->packet;
 315                 s->packet_length = rdata->packet_length;
 316                 memcpy(&(s->s3->rbuf), &(rdata->rbuf), sizeof(SSL3_BUFFER));
 317                 memcpy(&(s->s3->rrec), &(rdata->rrec), sizeof(SSL3_RECORD));
 318
 319                 OPENSSL_free(item->data);
 320                 pitem_free(item);
 321
 322                 /* s->d1->next_expected_seq_num++; */
 323                 return(1);
 324                 }
 325
 326         return 0;
 327         }
 328
 329 #endif
 330
 331 static int
 332 dtls1_process_record(SSL *s)
 333 {
 334     int i,al;
 335         int clear=0;
 336     int enc_err;
 337         SSL_SESSION *sess;
 338     SSL3_RECORD *rr;
 339         unsigned int mac_size;
 340         unsigned char md[EVP_MAX_MD_SIZE];
 341
 342
 343         rr= &(s->s3->rrec);
 344     sess = s->session;
 345
 346         /* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length,
 347          * and we have that many bytes in s->packet
 348          */
 349         rr->input= &(s->packet[DTLS1_RT_HEADER_LENGTH]);
 350
 351         /* ok, we can now read from 's->packet' data into 'rr'
 352          * rr->input points at rr->length bytes, which
 353          * need to be copied into rr->data by either
 354          * the decryption or by the decompression
 355          * When the data is 'copied' into the rr->data buffer,
 356          * rr->input will be pointed at the new buffer */
 357
 358         /* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
 359          * rr->length bytes of encrypted compressed stuff. */
 360
 361         /* check is not needed I believe */
 362         if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH)
 363                 {
 364                 al=SSL_AD_RECORD_OVERFLOW;
 365                 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
 366                 goto f_err;
 367                 }
 368
 369         /* decrypt in place in 'rr->input' */
 370         rr->data=rr->input;
 371
 372         enc_err = s->method->ssl3_enc->enc(s,0);
 373         if (enc_err <= 0)
 374                 {
 375                 if (enc_err == 0)
 376                         /* SSLerr() and ssl3_send_alert() have been called */
 377                         goto err;
 378
 379                 /* otherwise enc_err == -1 */
 380                 goto err;
 381                 }
 382
 383 #ifdef TLS_DEBUG
 384 printf("dec %d\n",rr->length);
 385 { unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); }
 386 printf("\n");
 387 #endif
 388
 389         /* r->length is now the compressed data plus mac */
 390 if (    (sess == NULL) ||
 391                 (s->enc_read_ctx == NULL) ||
 392                 (s->read_hash == NULL))
 393     clear=1;
 394
 395         if (!clear)
 396                 {
 397                 mac_size=EVP_MD_size(s->read_hash);
 398
 399                 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+mac_size)
 400                         {
 401 #if 0 /* OK only for stream ciphers (then rr->length is visible from ciphertext anyway) */
 402                         al=SSL_AD_RECORD_OVERFLOW;
 403                         SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_PRE_MAC_LENGTH_TOO_LONG);
 404                         goto f_err;
 405 #else
 406                         goto err;
 407 #endif
 408                         }
 409                 /* check the MAC for rr->input (it's in mac_size bytes at the tail) */
 410                 if (rr->length < mac_size)
 411                         {
 412 #if 0 /* OK only for stream ciphers */
 413                         al=SSL_AD_DECODE_ERROR;
 414                         SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_LENGTH_TOO_SHORT);
 415                         goto f_err;
 416 #else
 417                         goto err;
 418 #endif
 419                         }
 420                 rr->length-=mac_size;
 421                 i=s->method->ssl3_enc->mac(s,md,0);
 422                 if (memcmp(md,&(rr->data[rr->length]),mac_size) != 0)
 423                         {
 424                         goto err;
 425                         }
 426                 }
 427
 428         /* r->length is now just compressed */
 429         if (s->expand != NULL)
 430                 {
 431                 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH)
 432                         {
 433                         al=SSL_AD_RECORD_OVERFLOW;
 434                         SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG);
 435                         goto f_err;
 436                         }
 437                 if (!ssl3_do_uncompress(s))
 438                         {
 439                         al=SSL_AD_DECOMPRESSION_FAILURE;
 440                         SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_BAD_DECOMPRESSION);
 441                         goto f_err;
 442                         }
 443                 }
 444
 445         if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH)
 446                 {
 447                 al=SSL_AD_RECORD_OVERFLOW;
 448                 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_DATA_LENGTH_TOO_LONG);
 449                 goto f_err;
 450                 }
 451
 452         rr->off=0;
 453         /* So at this point the following is true
 454          * ssl->s3->rrec.type   is the type of record
 455          * ssl->s3->rrec.length == number of bytes in record
 456          * ssl->s3->rrec.off    == offset to first valid byte
 457          * ssl->s3->rrec.data   == where to take bytes from, increment
 458          *                         after use :-).
 459          */
 460
 461         /* we have pulled in a full packet so zero things */
 462         s->packet_length=0;
 463     dtls1_record_bitmap_update(s, &(s->d1->bitmap));/* Mark receipt of record. */
 464     return(1);
 465
 466 f_err:
 467         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 468 err:
 469         return(0);
 470 }
 471
 472
 473 /* Call this to get a new input record.
 474  * It will return <= 0 if more data is needed, normally due to an error
 475  * or non-blocking IO.
 476  * When it finishes, one packet has been decoded and can be found in
 477  * ssl->s3->rrec.type    - is the type of record
 478  * ssl->s3->rrec.data,   - data
 479  * ssl->s3->rrec.length, - number of bytes
 480  */
 481 /* used only by dtls1_read_bytes */
 482 int dtls1_get_record(SSL *s)
 483         {
 484         int ssl_major,ssl_minor;
 485         int i,n;
 486         SSL3_RECORD *rr;
 487         SSL_SESSION *sess;
 488         unsigned char *p = NULL;
 489         unsigned short version;
 490         DTLS1_BITMAP *bitmap;
 491         unsigned int is_next_epoch;
 492
 493         rr= &(s->s3->rrec);
 494         sess=s->session;
 495
 496     /* The epoch may have changed.  If so, process all the
 497      * pending records.  This is a non-blocking operation. */
 498     dtls1_process_buffered_records(s);
 499
 500         /* if we're renegotiating, then there may be buffered records */
 501         if (dtls1_get_processed_record(s))
 502                 return 1;
 503
 504         /* get something from the wire */
 505 again:
 506         /* check if we have the header */
 507         if (    (s->rstate != SSL_ST_READ_BODY) ||
 508                 (s->packet_length < DTLS1_RT_HEADER_LENGTH))
 509                 {
 510                 n=ssl3_read_n(s, DTLS1_RT_HEADER_LENGTH, s->s3->rbuf.len, 0);
 511                 /* read timeout is handled by dtls1_read_bytes */
 512                 if (n <= 0) return(n); /* error or non-blocking */
 513
 514                 /* this packet contained a partial record, dump it */
 515                 if (s->packet_length != DTLS1_RT_HEADER_LENGTH)
 516                         {
 517                         s->packet_length = 0;
 518                         goto again;
 519                         }
 520
 521                 s->rstate=SSL_ST_READ_BODY;
 522
 523                 p=s->packet;
 524
 525                 /* Pull apart the header into the DTLS1_RECORD */
 526                 rr->type= *(p++);
 527                 ssl_major= *(p++);
 528                 ssl_minor= *(p++);
 529                 version=(ssl_major<<8)|ssl_minor;
 530
 531                 /* sequence number is 64 bits, with top 2 bytes = epoch */
 532                 n2s(p,rr->epoch);
 533
 534                 memcpy(&(s->s3->read_sequence[2]), p, 6);
 535                 p+=6;
 536
 537                 n2s(p,rr->length);
 538
 539                 /* Lets check version */
 540                 if (!s->first_packet)
 541                         {
 542                         if (version != s->version && version != DTLS1_BAD_VER)
 543                                 {
 544                                 /* unexpected version, silently discard */
 545                                 rr->length = 0;
 546                                 s->packet_length = 0;
 547                                 goto again;
 548                                 }
 549                         }
 550
 551                 if ((version & 0xff00) != (DTLS1_VERSION & 0xff00) &&
 552                     (version & 0xff00) != (DTLS1_BAD_VER & 0xff00))
 553                         {
 554                         /* wrong version, silently discard record */
 555                         rr->length = 0;
 556                         s->packet_length = 0;
 557                         goto again;
 558                         }
 559
 560                 if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH)
 561                         {
 562                         /* record too long, silently discard it */
 563                         rr->length = 0;
 564                         s->packet_length = 0;
 565                         goto again;
 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                         rr->length = 0;
 585                         s->packet_length = 0;
 586                         goto again;
 587                         }
 588
 589                 /* now n == rr->length,
 590                  * and s->packet_length == DTLS1_RT_HEADER_LENGTH + rr->length */
 591                 }
 592         s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */
 593
 594         /* match epochs.  NULL means the packet is dropped on the floor */
 595         bitmap = dtls1_get_bitmap(s, rr, &is_next_epoch);
 596         if ( bitmap == NULL)
 597         {
 598         rr->length = 0;
 599         s->packet_length = 0;  /* dump this record */
 600         goto again;   /* get another record */
 601                 }
 602
 603         /* Check whether this is a repeat, or aged record.
 604          * Don't check if we're listening and this message is
 605          * a ClientHello. They can look as if they're replayed,
 606          * since they arrive from different connections and
 607          * would be dropped unnecessarily.
 608          */
 609         if (!(s->d1->listen && rr->type == SSL3_RT_HANDSHAKE &&
 610                 *p == SSL3_MT_CLIENT_HELLO) &&
 611                 ! dtls1_record_replay_check(s, bitmap, &(rr->seq_num)))
 612                 {
 613                 rr->length = 0;
 614                 s->packet_length=0; /* dump this record */
 615                 goto again;     /* get another record */
 616                 }
 617
 618         /* just read a 0 length packet */
 619         if (rr->length == 0) goto again;
 620
 621         /* If this record is from the next epoch (either HM or ALERT),
 622          * and a handshake is currently in progress, buffer it since it
 623          * cannot be processed at this time. */
 624         if (is_next_epoch)
 625                 {
 626                 if (SSL_in_init(s) || s->in_handshake)
 627                         {
 628                         dtls1_buffer_record(s, &(s->d1->unprocessed_rcds), &rr->seq_num);
 629                         }
 630                 rr->length = 0;
 631         s->packet_length = 0;
 632         goto again;
 633         }
 634
 635     if (!dtls1_process_record(s))
 636                 {
 637                 rr->length = 0;
 638                 s->packet_length=0; /* dump this record */
 639                 goto again;     /* get another record */
 640                 }
 641
 642         dtls1_clear_timeouts(s);  /* done waiting */
 643         return(1);
 644
 645         }
 646
 647 /* Return up to 'len' payload bytes received in 'type' records.
 648  * 'type' is one of the following:
 649  *
 650  *   -  SSL3_RT_HANDSHAKE (when ssl3_get_message calls us)
 651  *   -  SSL3_RT_APPLICATION_DATA (when ssl3_read calls us)
 652  *   -  0 (during a shutdown, no data has to be returned)
 653  *
 654  * If we don't have stored data to work from, read a SSL/TLS record first
 655  * (possibly multiple records if we still don't have anything to return).
 656  *
 657  * This function must handle any surprises the peer may have for us, such as
 658  * Alert records (e.g. close_notify), ChangeCipherSpec records (not really
 659  * a surprise, but handled as if it were), or renegotiation requests.
 660  * Also if record payloads contain fragments too small to process, we store
 661  * them until there is enough for the respective protocol (the record protocol
 662  * may use arbitrary fragmentation and even interleaving):
 663  *     Change cipher spec protocol
 664  *             just 1 byte needed, no need for keeping anything stored
 665  *     Alert protocol
 666  *             2 bytes needed (AlertLevel, AlertDescription)
 667  *     Handshake protocol
 668  *             4 bytes needed (HandshakeType, uint24 length) -- we just have
 669  *             to detect unexpected Client Hello and Hello Request messages
 670  *             here, anything else is handled by higher layers
 671  *     Application data protocol
 672  *             none of our business
 673  */
 674 int dtls1_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek)
 675         {
 676         int al,i,j,ret;
 677         unsigned int n;
 678         SSL3_RECORD *rr;
 679         void (*cb)(const SSL *ssl,int type2,int val)=NULL;
 680
 681         if (s->s3->rbuf.buf == NULL) /* Not initialized yet */
 682                 if (!ssl3_setup_buffers(s))
 683                         return(-1);
 684
 685     /* XXX: check what the second '&& type' is about */
 686         if ((type && (type != SSL3_RT_APPLICATION_DATA) &&
 687                 (type != SSL3_RT_HANDSHAKE) && type) ||
 688             (peek && (type != SSL3_RT_APPLICATION_DATA)))
 689                 {
 690                 SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR);
 691                 return -1;
 692                 }
 693
 694         /* check whether there's a handshake message (client hello?) waiting */
 695         if ( (ret = have_handshake_fragment(s, type, buf, len, peek)))
 696                 return ret;
 697
 698         /* Now s->d1->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */
 699
 700         if (!s->in_handshake && SSL_in_init(s))
 701                 {
 702                 /* type == SSL3_RT_APPLICATION_DATA */
 703                 i=s->handshake_func(s);
 704                 if (i < 0) return(i);
 705                 if (i == 0)
 706                         {
 707                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 708                         return(-1);
 709                         }
 710                 }
 711
 712 start:
 713         s->rwstate=SSL_NOTHING;
 714
 715         /* s->s3->rrec.type         - is the type of record
 716          * s->s3->rrec.data,    - data
 717          * s->s3->rrec.off,     - offset into 'data' for next read
 718          * s->s3->rrec.length,  - number of bytes. */
 719         rr = &(s->s3->rrec);
 720
 721         /* We are not handshaking and have no data yet,
 722          * so process data buffered during the last handshake
 723          * in advance, if any.
 724          */
 725         if (s->state == SSL_ST_OK && rr->length == 0)
 726                 {
 727                 pitem *item;
 728                 item = pqueue_pop(s->d1->buffered_app_data.q);
 729                 if (item)
 730                         {
 731                         dtls1_copy_record(s, item);
 732
 733                         OPENSSL_free(item->data);
 734                         pitem_free(item);
 735                         }
 736                 }
 737
 738         /* Check for timeout */
 739         if (dtls1_handle_timeout(s) > 0)
 740                 goto start;
 741
 742         /* get new packet if necessary */
 743         if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY))
 744                 {
 745                 ret=dtls1_get_record(s);
 746                 if (ret <= 0)
 747                         {
 748                         ret = dtls1_read_failed(s, ret);
 749                         /* anything other than a timeout is an error */
 750                         if (ret <= 0)
 751                                 return(ret);
 752                         else
 753                                 goto start;
 754                         }
 755                 }
 756
 757         /* we now have a packet which can be read and processed */
 758
 759         if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec,
 760                                        * reset by ssl3_get_finished */
 761                 && (rr->type != SSL3_RT_HANDSHAKE))
 762                 {
 763                 /* We now have application data between CCS and Finished.
 764                  * Most likely the packets were reordered on their way, so
 765                  * buffer the application data for later processing rather
 766                  * than dropping the connection.
 767                  */
 768                 dtls1_buffer_record(s, &(s->d1->buffered_app_data), &rr->seq_num);
 769                 rr->length = 0;
 770                 goto start;
 771                 }
 772
 773         /* If the other end has shut down, throw anything we read away
 774          * (even in 'peek' mode) */
 775         if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
 776                 {
 777                 rr->length=0;
 778                 s->rwstate=SSL_NOTHING;
 779                 return(0);
 780                 }
 781
 782
 783         if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */
 784                 {
 785                 /* make sure that we are not getting application data when we
 786                  * are doing a handshake for the first time */
 787                 if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
 788                         (s->enc_read_ctx == NULL))
 789                         {
 790                         al=SSL_AD_UNEXPECTED_MESSAGE;
 791                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE);
 792                         goto f_err;
 793                         }
 794
 795                 if (len <= 0) return(len);
 796
 797                 if ((unsigned int)len > rr->length)
 798                         n = rr->length;
 799                 else
 800                         n = (unsigned int)len;
 801
 802                 memcpy(buf,&(rr->data[rr->off]),n);
 803                 if (!peek)
 804                         {
 805                         rr->length-=n;
 806                         rr->off+=n;
 807                         if (rr->length == 0)
 808                                 {
 809                                 s->rstate=SSL_ST_READ_HEADER;
 810                                 rr->off=0;
 811                                 }
 812                         }
 813                 return(n);
 814                 }
 815
 816
 817         /* If we get here, then type != rr->type; if we have a handshake
 818          * message, then it was unexpected (Hello Request or Client Hello). */
 819
 820         /* In case of record types for which we have 'fragment' storage,
 821          * fill that so that we can process the data at a fixed place.
 822          */
 823                 {
 824                 unsigned int k, dest_maxlen = 0;
 825                 unsigned char *dest = NULL;
 826                 unsigned int *dest_len = NULL;
 827
 828                 if (rr->type == SSL3_RT_HANDSHAKE)
 829                         {
 830                         dest_maxlen = sizeof s->d1->handshake_fragment;
 831                         dest = s->d1->handshake_fragment;
 832                         dest_len = &s->d1->handshake_fragment_len;
 833                         }
 834                 else if (rr->type == SSL3_RT_ALERT)
 835                         {
 836                         dest_maxlen = sizeof(s->d1->alert_fragment);
 837                         dest = s->d1->alert_fragment;
 838                         dest_len = &s->d1->alert_fragment_len;
 839                         }
 840                 /* else it's a CCS message, or application data or wrong */
 841                 else if (rr->type != SSL3_RT_CHANGE_CIPHER_SPEC)
 842                         {
 843                         /* Application data while renegotiating
 844                          * is allowed. Try again reading.
 845                          */
 846                         if (rr->type == SSL3_RT_APPLICATION_DATA)
 847                                 {
 848                                 BIO *bio;
 849                                 s->s3->in_read_app_data=2;
 850                                 bio=SSL_get_rbio(s);
 851                                 s->rwstate=SSL_READING;
 852                                 BIO_clear_retry_flags(bio);
 853                                 BIO_set_retry_read(bio);
 854                                 return(-1);
 855                                 }
 856
 857                         /* Not certain if this is the right error handling */
 858                         al=SSL_AD_UNEXPECTED_MESSAGE;
 859                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
 860                         goto f_err;
 861                         }
 862
 863                 if (dest_maxlen > 0)
 864                         {
 865             /* XDTLS:  In a pathalogical case, the Client Hello
 866              *  may be fragmented--don't always expect dest_maxlen bytes */
 867                         if ( rr->length < dest_maxlen)
 868                                 {
 869 #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
 870                                 /*
 871                                  * for normal alerts rr->length is 2, while
 872                                  * dest_maxlen is 7 if we were to handle this
 873                                  * non-existing alert...
 874                                  */
 875                                 FIX ME
 876 #endif
 877                                 s->rstate=SSL_ST_READ_HEADER;
 878                                 rr->length = 0;
 879                                 goto start;
 880                                 }
 881
 882                         /* now move 'n' bytes: */
 883                         for ( k = 0; k < dest_maxlen; k++)
 884                                 {
 885                                 dest[k] = rr->data[rr->off++];
 886                                 rr->length--;
 887                                 }
 888                         *dest_len = dest_maxlen;
 889                         }
 890                 }
 891
 892         /* s->d1->handshake_fragment_len == 12  iff  rr->type == SSL3_RT_HANDSHAKE;
 893          * s->d1->alert_fragment_len == 7      iff  rr->type == SSL3_RT_ALERT.
 894          * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */
 895
 896         /* If we are a client, check for an incoming 'Hello Request': */
 897         if ((!s->server) &&
 898                 (s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) &&
 899                 (s->d1->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
 900                 (s->session != NULL) && (s->session->cipher != NULL))
 901                 {
 902                 s->d1->handshake_fragment_len = 0;
 903
 904                 if ((s->d1->handshake_fragment[1] != 0) ||
 905                         (s->d1->handshake_fragment[2] != 0) ||
 906                         (s->d1->handshake_fragment[3] != 0))
 907                         {
 908                         al=SSL_AD_DECODE_ERROR;
 909                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_BAD_HELLO_REQUEST);
 910                         goto err;
 911                         }
 912
 913                 /* no need to check sequence number on HELLO REQUEST messages */
 914
 915                 if (s->msg_callback)
 916                         s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,
 917                                 s->d1->handshake_fragment, 4, s, s->msg_callback_arg);
 918
 919                 if (SSL_is_init_finished(s) &&
 920                         !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
 921                         !s->s3->renegotiate)
 922                         {
 923                         ssl3_renegotiate(s);
 924                         if (ssl3_renegotiate_check(s))
 925                                 {
 926                                 i=s->handshake_func(s);
 927                                 if (i < 0) return(i);
 928                                 if (i == 0)
 929                                         {
 930                                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 931                                         return(-1);
 932                                         }
 933
 934                                 if (!(s->mode & SSL_MODE_AUTO_RETRY))
 935                                         {
 936                                         if (s->s3->rbuf.left == 0) /* no read-ahead left? */
 937                                                 {
 938                                                 BIO *bio;
 939                                                 /* In the case where we try to read application data,
 940                                                  * but we trigger an SSL handshake, we return -1 with
 941                                                  * the retry option set.  Otherwise renegotiation may
 942                                                  * cause nasty problems in the blocking world */
 943                                                 s->rwstate=SSL_READING;
 944                                                 bio=SSL_get_rbio(s);
 945                                                 BIO_clear_retry_flags(bio);
 946                                                 BIO_set_retry_read(bio);
 947                                                 return(-1);
 948                                                 }
 949                                         }
 950                                 }
 951                         }
 952                 /* we either finished a handshake or ignored the request,
 953                  * now try again to obtain the (application) data we were asked for */
 954                 goto start;
 955                 }
 956
 957         if (s->d1->alert_fragment_len >= DTLS1_AL_HEADER_LENGTH)
 958                 {
 959                 int alert_level = s->d1->alert_fragment[0];
 960                 int alert_descr = s->d1->alert_fragment[1];
 961
 962                 s->d1->alert_fragment_len = 0;
 963
 964                 if (s->msg_callback)
 965                         s->msg_callback(0, s->version, SSL3_RT_ALERT,
 966                                 s->d1->alert_fragment, 2, s, s->msg_callback_arg);
 967
 968                 if (s->info_callback != NULL)
 969                         cb=s->info_callback;
 970                 else if (s->ctx->info_callback != NULL)
 971                         cb=s->ctx->info_callback;
 972
 973                 if (cb != NULL)
 974                         {
 975                         j = (alert_level << 8) | alert_descr;
 976                         cb(s, SSL_CB_READ_ALERT, j);
 977                         }
 978
 979                 if (alert_level == 1) /* warning */
 980                         {
 981                         s->s3->warn_alert = alert_descr;
 982                         if (alert_descr == SSL_AD_CLOSE_NOTIFY)
 983                                 {
 984                                 s->shutdown |= SSL_RECEIVED_SHUTDOWN;
 985                                 return(0);
 986                                 }
 987 #if 0
 988             /* XXX: this is a possible improvement in the future */
 989                         /* now check if it's a missing record */
 990                         if (alert_descr == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE)
 991                                 {
 992                                 unsigned short seq;
 993                                 unsigned int frag_off;
 994                                 unsigned char *p = &(s->d1->alert_fragment[2]);
 995
 996                                 n2s(p, seq);
 997                                 n2l3(p, frag_off);
 998
 999                                 dtls1_retransmit_message(s,
1000                                                                                  dtls1_get_queue_priority(frag->msg_header.seq, 0),
1001                                                                                  frag_off, &found);
1002                                 if ( ! found  && SSL_in_init(s))
1003                                         {
1004                                         /* fprintf( stderr,"in init = %d\n", SSL_in_init(s)); */
1005                                         /* requested a message not yet sent,
1006                                            send an alert ourselves */
1007                                         ssl3_send_alert(s,SSL3_AL_WARNING,
1008                                                 DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);
1009                                         }
1010                                 }
1011 #endif
1012                         }
1013                 else if (alert_level == 2) /* fatal */
1014                         {
1015                         char tmp[16];
1016
1017                         s->rwstate=SSL_NOTHING;
1018                         s->s3->fatal_alert = alert_descr;
1019                         SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr);
1020                         BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr);
1021                         ERR_add_error_data(2,"SSL alert number ",tmp);
1022                         s->shutdown|=SSL_RECEIVED_SHUTDOWN;
1023                         SSL_CTX_remove_session(s->ctx,s->session);
1024                         return(0);
1025                         }
1026                 else
1027                         {
1028                         al=SSL_AD_ILLEGAL_PARAMETER;
1029                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE);
1030                         goto f_err;
1031                         }
1032
1033                 goto start;
1034                 }
1035
1036         if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */
1037                 {
1038                 s->rwstate=SSL_NOTHING;
1039                 rr->length=0;
1040                 return(0);
1041                 }
1042
1043         if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
1044                 {
1045                 struct ccs_header_st ccs_hdr;
1046                 unsigned int ccs_hdr_len = DTLS1_CCS_HEADER_LENGTH;
1047
1048                 dtls1_get_ccs_header(rr->data, &ccs_hdr);
1049
1050                 /* 'Change Cipher Spec' is just a single byte, so we know
1051                  * exactly what the record payload has to look like */
1052                 /* XDTLS: check that epoch is consistent */
1053                 if (s->client_version == DTLS1_BAD_VER || s->version == DTLS1_BAD_VER)
1054                         ccs_hdr_len = 3;
1055
1056                 if ((rr->length != ccs_hdr_len) || (rr->off != 0) || (rr->data[0] != SSL3_MT_CCS))
1057                         {
1058                         i=SSL_AD_ILLEGAL_PARAMETER;
1059                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
1060                         goto err;
1061                         }
1062
1063                 rr->length=0;
1064
1065                 if (s->msg_callback)
1066                         s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC,
1067                                 rr->data, 1, s, s->msg_callback_arg);
1068
1069                 /* We can't process a CCS now, because previous handshake
1070                  * messages are still missing, so just drop it.
1071                  */
1072                 if (!s->d1->change_cipher_spec_ok)
1073                         {
1074                         goto start;
1075                         }
1076
1077                 s->d1->change_cipher_spec_ok = 0;
1078
1079                 s->s3->change_cipher_spec=1;
1080                 if (!ssl3_do_change_cipher_spec(s))
1081                         goto err;
1082
1083                 /* do this whenever CCS is processed */
1084                 dtls1_reset_seq_numbers(s, SSL3_CC_READ);
1085
1086                 if (s->client_version == DTLS1_BAD_VER)
1087                         s->d1->handshake_read_seq++;
1088
1089                 goto start;
1090                 }
1091
1092         /* Unexpected handshake message (Client Hello, or protocol violation) */
1093         if ((s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) &&
1094                 !s->in_handshake)
1095                 {
1096                 struct hm_header_st msg_hdr;
1097
1098                 /* this may just be a stale retransmit */
1099                 dtls1_get_message_header(rr->data, &msg_hdr);
1100                 if( rr->epoch != s->d1->r_epoch)
1101                         {
1102                         rr->length = 0;
1103                         goto start;
1104                         }
1105
1106                 /* If we are server, we may have a repeated FINISHED of the
1107                  * client here, then retransmit our CCS and FINISHED.
1108                  */
1109                 if (msg_hdr.type == SSL3_MT_FINISHED)
1110                         {
1111                         dtls1_retransmit_buffered_messages(s);
1112                         rr->length = 0;
1113                         goto start;
1114                         }
1115
1116                 if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
1117                         !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
1118                         {
1119 #if 0 /* worked only because C operator preferences are not as expected (and
1120        * because this is not really needed for clients except for detecting
1121        * protocol violations): */
1122                         s->state=SSL_ST_BEFORE|(s->server)
1123                                 ?SSL_ST_ACCEPT
1124                                 :SSL_ST_CONNECT;
1125 #else
1126                         s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT;
1127 #endif
1128                         s->new_session=1;
1129                         }
1130                 i=s->handshake_func(s);
1131                 if (i < 0) return(i);
1132                 if (i == 0)
1133                         {
1134                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1135                         return(-1);
1136                         }
1137
1138                 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1139                         {
1140                         if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1141                                 {
1142                                 BIO *bio;
1143                                 /* In the case where we try to read application data,
1144                                  * but we trigger an SSL handshake, we return -1 with
1145                                  * the retry option set.  Otherwise renegotiation may
1146                                  * cause nasty problems in the blocking world */
1147                                 s->rwstate=SSL_READING;
1148                                 bio=SSL_get_rbio(s);
1149                                 BIO_clear_retry_flags(bio);
1150                                 BIO_set_retry_read(bio);
1151                                 return(-1);
1152                                 }
1153                         }
1154                 goto start;
1155                 }
1156
1157         switch (rr->type)
1158                 {
1159         default:
1160 #ifndef OPENSSL_NO_TLS
1161                 /* TLS just ignores unknown message types */
1162                 if (s->version == TLS1_VERSION)
1163                         {
1164                         rr->length = 0;
1165                         goto start;
1166                         }
1167 #endif
1168                 al=SSL_AD_UNEXPECTED_MESSAGE;
1169                 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1170                 goto f_err;
1171         case SSL3_RT_CHANGE_CIPHER_SPEC:
1172         case SSL3_RT_ALERT:
1173         case SSL3_RT_HANDSHAKE:
1174                 /* we already handled all of these, with the possible exception
1175                  * of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that
1176                  * should not happen when type != rr->type */
1177                 al=SSL_AD_UNEXPECTED_MESSAGE;
1178                 SSLerr(SSL_F_DTLS1_READ_BYTES,ERR_R_INTERNAL_ERROR);
1179                 goto f_err;
1180         case SSL3_RT_APPLICATION_DATA:
1181                 /* At this point, we were expecting handshake data,
1182                  * but have application data.  If the library was
1183                  * running inside ssl3_read() (i.e. in_read_app_data
1184                  * is set) and it makes sense to read application data
1185                  * at this point (session renegotiation not yet started),
1186                  * we will indulge it.
1187                  */
1188                 if (s->s3->in_read_app_data &&
1189                         (s->s3->total_renegotiations != 0) &&
1190                         ((
1191                                 (s->state & SSL_ST_CONNECT) &&
1192                                 (s->state >= SSL3_ST_CW_CLNT_HELLO_A) &&
1193                                 (s->state <= SSL3_ST_CR_SRVR_HELLO_A)
1194                                 ) || (
1195                                         (s->state & SSL_ST_ACCEPT) &&
1196                                         (s->state <= SSL3_ST_SW_HELLO_REQ_A) &&
1197                                         (s->state >= SSL3_ST_SR_CLNT_HELLO_A)
1198                                         )
1199                                 ))
1200                         {
1201                         s->s3->in_read_app_data=2;
1202                         return(-1);
1203                         }
1204                 else
1205                         {
1206                         al=SSL_AD_UNEXPECTED_MESSAGE;
1207                         SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1208                         goto f_err;
1209                         }
1210                 }
1211         /* not reached */
1212
1213 f_err:
1214         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1215 err:
1216         return(-1);
1217         }
1218
1219 int
1220 dtls1_write_app_data_bytes(SSL *s, int type, const void *buf_, int len)
1221         {
1222         int i;
1223
1224         if (SSL_in_init(s) && !s->in_handshake)
1225                 {
1226                 i=s->handshake_func(s);
1227                 if (i < 0) return(i);
1228                 if (i == 0)
1229                         {
1230                         SSLerr(SSL_F_DTLS1_WRITE_APP_DATA_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1231                         return -1;
1232                         }
1233                 }
1234
1235         if (len > SSL3_RT_MAX_PLAIN_LENGTH)
1236                 {
1237                         SSLerr(SSL_F_DTLS1_WRITE_APP_DATA_BYTES,SSL_R_DTLS_MESSAGE_TOO_BIG);
1238                         return -1;
1239                 }
1240
1241         i = dtls1_write_bytes(s, type, buf_, len);
1242         return i;
1243         }
1244
1245
1246         /* this only happens when a client hello is received and a handshake
1247          * is started. */
1248 static int
1249 have_handshake_fragment(SSL *s, int type, unsigned char *buf,
1250         int len, int peek)
1251         {
1252
1253         if ((type == SSL3_RT_HANDSHAKE) && (s->d1->handshake_fragment_len > 0))
1254                 /* (partially) satisfy request from storage */
1255                 {
1256                 unsigned char *src = s->d1->handshake_fragment;
1257                 unsigned char *dst = buf;
1258                 unsigned int k,n;
1259
1260                 /* peek == 0 */
1261                 n = 0;
1262                 while ((len > 0) && (s->d1->handshake_fragment_len > 0))
1263                         {
1264                         *dst++ = *src++;
1265                         len--; s->d1->handshake_fragment_len--;
1266                         n++;
1267                         }
1268                 /* move any remaining fragment bytes: */
1269                 for (k = 0; k < s->d1->handshake_fragment_len; k++)
1270                         s->d1->handshake_fragment[k] = *src++;
1271                 return n;
1272                 }
1273
1274         return 0;
1275         }
1276
1277
1278
1279
1280 /* Call this to write data in records of type 'type'
1281  * It will return <= 0 if not all data has been sent or non-blocking IO.
1282  */
1283 int dtls1_write_bytes(SSL *s, int type, const void *buf, int len)
1284         {
1285         int i;
1286
1287         OPENSSL_assert(len <= SSL3_RT_MAX_PLAIN_LENGTH);
1288         s->rwstate=SSL_NOTHING;
1289         i=do_dtls1_write(s, type, buf, len, 0);
1290         return i;
1291         }
1292
1293 int do_dtls1_write(SSL *s, int type, const unsigned char *buf, unsigned int len, int create_empty_fragment)
1294         {
1295         unsigned char *p,*pseq;
1296         int i,mac_size,clear=0;
1297         int prefix_len = 0;
1298         SSL3_RECORD *wr;
1299         SSL3_BUFFER *wb;
1300         SSL_SESSION *sess;
1301         int bs;
1302
1303         /* first check if there is a SSL3_BUFFER still being written
1304          * out.  This will happen with non blocking IO */
1305         if (s->s3->wbuf.left != 0)
1306                 {
1307                 OPENSSL_assert(0); /* XDTLS:  want to see if we ever get here */
1308                 return(ssl3_write_pending(s,type,buf,len));
1309                 }
1310
1311         /* If we have an alert to send, lets send it */
1312         if (s->s3->alert_dispatch)
1313                 {
1314                 i=s->method->ssl_dispatch_alert(s);
1315                 if (i <= 0)
1316                         return(i);
1317                 /* if it went, fall through and send more stuff */
1318                 }
1319
1320         if (len == 0 && !create_empty_fragment)
1321                 return 0;
1322
1323         wr= &(s->s3->wrec);
1324         wb= &(s->s3->wbuf);
1325         sess=s->session;
1326
1327         if (    (sess == NULL) ||
1328                 (s->enc_write_ctx == NULL) ||
1329                 (s->write_hash == NULL))
1330                 clear=1;
1331
1332         if (clear)
1333                 mac_size=0;
1334         else
1335                 mac_size=EVP_MD_size(s->write_hash);
1336
1337         /* DTLS implements explicit IV, so no need for empty fragments */
1338 #if 0
1339         /* 'create_empty_fragment' is true only when this function calls itself */
1340         if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done
1341             && SSL_version(s) != DTLS1_VERSION && SSL_version(s) != DTLS1_BAD_VER)
1342                 {
1343                 /* countermeasure against known-IV weakness in CBC ciphersuites
1344                  * (see http://www.openssl.org/~bodo/tls-cbc.txt)
1345                  */
1346
1347                 if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA)
1348                         {
1349                         /* recursive function call with 'create_empty_fragment' set;
1350                          * this prepares and buffers the data for an empty fragment
1351                          * (these 'prefix_len' bytes are sent out later
1352                          * together with the actual payload) */
1353                         prefix_len = s->method->do_ssl_write(s, type, buf, 0, 1);
1354                         if (prefix_len <= 0)
1355                                 goto err;
1356
1357                         if (s->s3->wbuf.len < (size_t)prefix_len + SSL3_RT_MAX_PACKET_SIZE)
1358                                 {
1359                                 /* insufficient space */
1360                                 SSLerr(SSL_F_DO_DTLS1_WRITE, ERR_R_INTERNAL_ERROR);
1361                                 goto err;
1362                                 }
1363                         }
1364
1365                 s->s3->empty_fragment_done = 1;
1366                 }
1367 #endif
1368
1369         p = wb->buf + prefix_len;
1370
1371         /* write the header */
1372
1373         *(p++)=type&0xff;
1374         wr->type=type;
1375
1376         if (s->client_version == DTLS1_BAD_VER)
1377                 *(p++) = DTLS1_BAD_VER>>8,
1378                 *(p++) = DTLS1_BAD_VER&0xff;
1379         else
1380                 *(p++)=(s->version>>8),
1381                 *(p++)=s->version&0xff;
1382
1383         /* field where we are to write out packet epoch, seq num and len */
1384         pseq=p;
1385         p+=10;
1386
1387         /* lets setup the record stuff. */
1388
1389         /* Make space for the explicit IV in case of CBC.
1390          * (this is a bit of a boundary violation, but what the heck).
1391          */
1392         if ( s->enc_write_ctx &&
1393                 (EVP_CIPHER_mode( s->enc_write_ctx->cipher ) & EVP_CIPH_CBC_MODE))
1394                 bs = EVP_CIPHER_block_size(s->enc_write_ctx->cipher);
1395         else
1396                 bs = 0;
1397
1398         wr->data=p + bs;  /* make room for IV in case of CBC */
1399         wr->length=(int)len;
1400         wr->input=(unsigned char *)buf;
1401
1402         /* we now 'read' from wr->input, wr->length bytes into
1403          * wr->data */
1404
1405         /* first we compress */
1406         if (s->compress != NULL)
1407                 {
1408                 if (!ssl3_do_compress(s))
1409                         {
1410                         SSLerr(SSL_F_DO_DTLS1_WRITE,SSL_R_COMPRESSION_FAILURE);
1411                         goto err;
1412                         }
1413                 }
1414         else
1415                 {
1416                 memcpy(wr->data,wr->input,wr->length);
1417                 wr->input=wr->data;
1418                 }
1419
1420         /* we should still have the output to wr->data and the input
1421          * from wr->input.  Length should be wr->length.
1422          * wr->data still points in the wb->buf */
1423
1424         if (mac_size != 0)
1425                 {
1426                 s->method->ssl3_enc->mac(s,&(p[wr->length + bs]),1);
1427                 wr->length+=mac_size;
1428                 }
1429
1430         /* this is true regardless of mac size */
1431         wr->input=p;
1432         wr->data=p;
1433
1434
1435         /* ssl3_enc can only have an error on read */
1436         if (bs) /* bs != 0 in case of CBC */
1437                 {
1438                 RAND_pseudo_bytes(p,bs);
1439                 /* master IV and last CBC residue stand for
1440                  * the rest of randomness */
1441                 wr->length += bs;
1442                 }
1443
1444         s->method->ssl3_enc->enc(s,1);
1445
1446         /* record length after mac and block padding */
1447 /*      if (type == SSL3_RT_APPLICATION_DATA ||
1448         (type == SSL3_RT_ALERT && ! SSL_in_init(s))) */
1449
1450         /* there's only one epoch between handshake and app data */
1451
1452         s2n(s->d1->w_epoch, pseq);
1453
1454         /* XDTLS: ?? */
1455 /*      else
1456         s2n(s->d1->handshake_epoch, pseq); */
1457
1458         memcpy(pseq, &(s->s3->write_sequence[2]), 6);
1459         pseq+=6;
1460         s2n(wr->length,pseq);
1461
1462         /* we should now have
1463          * wr->data pointing to the encrypted data, which is
1464          * wr->length long */
1465         wr->type=type; /* not needed but helps for debugging */
1466         wr->length+=DTLS1_RT_HEADER_LENGTH;
1467
1468 #if 0  /* this is now done at the message layer */
1469         /* buffer the record, making it easy to handle retransmits */
1470         if ( type == SSL3_RT_HANDSHAKE || type == SSL3_RT_CHANGE_CIPHER_SPEC)
1471                 dtls1_buffer_record(s, wr->data, wr->length,
1472                         *((PQ_64BIT *)&(s->s3->write_sequence[0])));
1473 #endif
1474
1475         ssl3_record_sequence_update(&(s->s3->write_sequence[0]));
1476
1477         if (create_empty_fragment)
1478                 {
1479                 /* we are in a recursive call;
1480                  * just return the length, don't write out anything here
1481                  */
1482                 return wr->length;
1483                 }
1484
1485         /* now let's set up wb */
1486         wb->left = prefix_len + wr->length;
1487         wb->offset = 0;
1488
1489         /* memorize arguments so that ssl3_write_pending can detect bad write retries later */
1490         s->s3->wpend_tot=len;
1491         s->s3->wpend_buf=buf;
1492         s->s3->wpend_type=type;
1493         s->s3->wpend_ret=len;
1494
1495         /* we now just need to write the buffer */
1496         return ssl3_write_pending(s,type,buf,len);
1497 err:
1498         return -1;
1499         }
1500
1501
1502
1503 static int dtls1_record_replay_check(SSL *s, DTLS1_BITMAP *bitmap,
1504         PQ_64BIT *seq_num)
1505         {
1506 #if PQ_64BIT_IS_INTEGER
1507         PQ_64BIT mask = 0x0000000000000001L;
1508 #endif
1509         PQ_64BIT rcd_num, tmp;
1510
1511         pq_64bit_init(&rcd_num);
1512         pq_64bit_init(&tmp);
1513
1514         /* this is the sequence number for the record just read */
1515         pq_64bit_bin2num(&rcd_num, s->s3->read_sequence, 8);
1516
1517
1518         if (pq_64bit_gt(&rcd_num, &(bitmap->max_seq_num)) ||
1519                 pq_64bit_eq(&rcd_num, &(bitmap->max_seq_num)))
1520                 {
1521                 pq_64bit_assign(seq_num, &rcd_num);
1522                 pq_64bit_free(&rcd_num);
1523                 pq_64bit_free(&tmp);
1524                 return 1;  /* this record is new */
1525                 }
1526
1527         pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num);
1528
1529         if ( pq_64bit_get_word(&tmp) > bitmap->length)
1530                 {
1531                 pq_64bit_free(&rcd_num);
1532                 pq_64bit_free(&tmp);
1533                 return 0;  /* stale, outside the window */
1534                 }
1535
1536 #if PQ_64BIT_IS_BIGNUM
1537         {
1538         int offset;
1539         pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num);
1540         pq_64bit_sub_word(&tmp, 1);
1541         offset = pq_64bit_get_word(&tmp);
1542         if ( pq_64bit_is_bit_set(&(bitmap->map), offset))
1543                 {
1544                 pq_64bit_free(&rcd_num);
1545                 pq_64bit_free(&tmp);
1546                 return 0;
1547                 }
1548         }
1549 #else
1550         mask <<= (bitmap->max_seq_num - rcd_num - 1);
1551         if (bitmap->map & mask)
1552                 return 0; /* record previously received */
1553 #endif
1554
1555         pq_64bit_assign(seq_num, &rcd_num);
1556         pq_64bit_free(&rcd_num);
1557         pq_64bit_free(&tmp);
1558         return 1;
1559         }
1560
1561
1562 static void dtls1_record_bitmap_update(SSL *s, DTLS1_BITMAP *bitmap)
1563         {
1564         unsigned int shift;
1565         PQ_64BIT rcd_num;
1566         PQ_64BIT tmp;
1567         PQ_64BIT_CTX *ctx;
1568
1569         pq_64bit_init(&rcd_num);
1570         pq_64bit_init(&tmp);
1571
1572         pq_64bit_bin2num(&rcd_num, s->s3->read_sequence, 8);
1573
1574         /* unfortunate code complexity due to 64-bit manipulation support
1575          * on 32-bit machines */
1576         if ( pq_64bit_gt(&rcd_num, &(bitmap->max_seq_num)) ||
1577                 pq_64bit_eq(&rcd_num, &(bitmap->max_seq_num)))
1578                 {
1579                 pq_64bit_sub(&tmp, &rcd_num, &(bitmap->max_seq_num));
1580                 pq_64bit_add_word(&tmp, 1);
1581
1582                 shift = (unsigned int)pq_64bit_get_word(&tmp);
1583
1584                 pq_64bit_lshift(&(tmp), &(bitmap->map), shift);
1585                 pq_64bit_assign(&(bitmap->map), &tmp);
1586
1587                 pq_64bit_set_bit(&(bitmap->map), 0);
1588                 pq_64bit_add_word(&rcd_num, 1);
1589                 pq_64bit_assign(&(bitmap->max_seq_num), &rcd_num);
1590
1591                 pq_64bit_assign_word(&tmp, 1);
1592                 pq_64bit_lshift(&tmp, &tmp, bitmap->length);
1593                 ctx = pq_64bit_ctx_new(&ctx);
1594                 pq_64bit_mod(&(bitmap->map), &(bitmap->map), &tmp, ctx);
1595                 pq_64bit_ctx_free(ctx);
1596                 }
1597         else
1598                 {
1599                 pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num);
1600                 pq_64bit_sub_word(&tmp, 1);
1601                 shift = (unsigned int)pq_64bit_get_word(&tmp);
1602
1603                 pq_64bit_set_bit(&(bitmap->map), shift);
1604                 }
1605
1606         pq_64bit_free(&rcd_num);
1607         pq_64bit_free(&tmp);
1608         }
1609
1610
1611 int dtls1_dispatch_alert(SSL *s)
1612         {
1613         int i,j;
1614         void (*cb)(const SSL *ssl,int type,int val)=NULL;
1615         unsigned char buf[DTLS1_AL_HEADER_LENGTH];
1616         unsigned char *ptr = &buf[0];
1617
1618         s->s3->alert_dispatch=0;
1619
1620         memset(buf, 0x00, sizeof(buf));
1621         *ptr++ = s->s3->send_alert[0];
1622         *ptr++ = s->s3->send_alert[1];
1623
1624 #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
1625         if (s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE)
1626                 {
1627                 s2n(s->d1->handshake_read_seq, ptr);
1628 #if 0
1629                 if ( s->d1->r_msg_hdr.frag_off == 0)  /* waiting for a new msg */
1630
1631                 else
1632                         s2n(s->d1->r_msg_hdr.seq, ptr); /* partial msg read */
1633 #endif
1634
1635 #if 0
1636                 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);
1637 #endif
1638                 l2n3(s->d1->r_msg_hdr.frag_off, ptr);
1639                 }
1640 #endif
1641
1642         i = do_dtls1_write(s, SSL3_RT_ALERT, &buf[0], sizeof(buf), 0);
1643         if (i <= 0)
1644                 {
1645                 s->s3->alert_dispatch=1;
1646                 /* fprintf( stderr, "not done with alert\n" ); */
1647                 }
1648         else
1649                 {
1650                 if (s->s3->send_alert[0] == SSL3_AL_FATAL
1651 #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
1652                     || s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
1653 #endif
1654                    )
1655                         (void)BIO_flush(s->wbio);
1656
1657                 if (s->msg_callback)
1658                         s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert,
1659                                 2, s, s->msg_callback_arg);
1660
1661                 if (s->info_callback != NULL)
1662                         cb=s->info_callback;
1663                 else if (s->ctx->info_callback != NULL)
1664                         cb=s->ctx->info_callback;
1665
1666                 if (cb != NULL)
1667                         {
1668                         j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
1669                         cb(s,SSL_CB_WRITE_ALERT,j);
1670                         }
1671                 }
1672         return(i);
1673         }
1674
1675
1676 static DTLS1_BITMAP *
1677 dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr, unsigned int *is_next_epoch)
1678     {
1679
1680     *is_next_epoch = 0;
1681
1682     /* In current epoch, accept HM, CCS, DATA, & ALERT */
1683     if (rr->epoch == s->d1->r_epoch)
1684         return &s->d1->bitmap;
1685
1686     /* Only HM and ALERT messages can be from the next epoch */
1687     else if (rr->epoch == (unsigned long)(s->d1->r_epoch + 1) &&
1688         (rr->type == SSL3_RT_HANDSHAKE ||
1689             rr->type == SSL3_RT_ALERT))
1690         {
1691         *is_next_epoch = 1;
1692         return &s->d1->next_bitmap;
1693         }
1694
1695     return NULL;
1696     }
1697
1698 #if 0
1699 static int
1700 dtls1_record_needs_buffering(SSL *s, SSL3_RECORD *rr, unsigned short *priority,
1701         unsigned long *offset)
1702         {
1703
1704         /* alerts are passed up immediately */
1705         if ( rr->type == SSL3_RT_APPLICATION_DATA ||
1706                 rr->type == SSL3_RT_ALERT)
1707                 return 0;
1708
1709         /* Only need to buffer if a handshake is underway.
1710          * (this implies that Hello Request and Client Hello are passed up
1711          * immediately) */
1712         if ( SSL_in_init(s))
1713                 {
1714                 unsigned char *data = rr->data;
1715                 /* need to extract the HM/CCS sequence number here */
1716                 if ( rr->type == SSL3_RT_HANDSHAKE ||
1717                         rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
1718                         {
1719                         unsigned short seq_num;
1720                         struct hm_header_st msg_hdr;
1721                         struct ccs_header_st ccs_hdr;
1722
1723                         if ( rr->type == SSL3_RT_HANDSHAKE)
1724                                 {
1725                                 dtls1_get_message_header(data, &msg_hdr);
1726                                 seq_num = msg_hdr.seq;
1727                                 *offset = msg_hdr.frag_off;
1728                                 }
1729                         else
1730                                 {
1731                                 dtls1_get_ccs_header(data, &ccs_hdr);
1732                                 seq_num = ccs_hdr.seq;
1733                                 *offset = 0;
1734                                 }
1735
1736                         /* this is either a record we're waiting for, or a
1737                          * retransmit of something we happened to previously
1738                          * receive (higher layers will drop the repeat silently */
1739                         if ( seq_num < s->d1->handshake_read_seq)
1740                                 return 0;
1741                         if (rr->type == SSL3_RT_HANDSHAKE &&
1742                                 seq_num == s->d1->handshake_read_seq &&
1743                                 msg_hdr.frag_off < s->d1->r_msg_hdr.frag_off)
1744                                 return 0;
1745                         else if ( seq_num == s->d1->handshake_read_seq &&
1746                                 (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC ||
1747                                         msg_hdr.frag_off == s->d1->r_msg_hdr.frag_off))
1748                                 return 0;
1749                         else
1750                                 {
1751                                 *priority = seq_num;
1752                                 return 1;
1753                                 }
1754                         }
1755                 else /* unknown record type */
1756                         return 0;
1757                 }
1758
1759         return 0;
1760         }
1761 #endif
1762
1763 void
1764 dtls1_reset_seq_numbers(SSL *s, int rw)
1765         {
1766         unsigned char *seq;
1767         unsigned int seq_bytes = sizeof(s->s3->read_sequence);
1768
1769         if ( rw & SSL3_CC_READ)
1770                 {
1771                 seq = s->s3->read_sequence;
1772                 s->d1->r_epoch++;
1773
1774                 pq_64bit_assign(&(s->d1->bitmap.map), &(s->d1->next_bitmap.map));
1775                 s->d1->bitmap.length = s->d1->next_bitmap.length;
1776                 pq_64bit_assign(&(s->d1->bitmap.max_seq_num),
1777                         &(s->d1->next_bitmap.max_seq_num));
1778
1779                 pq_64bit_free(&(s->d1->next_bitmap.map));
1780                 pq_64bit_free(&(s->d1->next_bitmap.max_seq_num));
1781                 memset(&(s->d1->next_bitmap), 0x00, sizeof(DTLS1_BITMAP));
1782                 pq_64bit_init(&(s->d1->next_bitmap.map));
1783                 pq_64bit_init(&(s->d1->next_bitmap.max_seq_num));
1784                 }
1785         else
1786                 {
1787                 seq = s->s3->write_sequence;
1788                 memcpy(s->d1->last_write_sequence, seq, sizeof(s->s3->write_sequence));
1789                 s->d1->w_epoch++;
1790                 }
1791
1792         memset(seq, 0x00, seq_bytes);
1793         }
1794
1795 #if PQ_64BIT_IS_INTEGER
1796 static PQ_64BIT
1797 bytes_to_long_long(unsigned char *bytes, PQ_64BIT *num)
1798        {
1799        PQ_64BIT _num;
1800
1801        _num = (((PQ_64BIT)bytes[0]) << 56) |
1802                (((PQ_64BIT)bytes[1]) << 48) |
1803                (((PQ_64BIT)bytes[2]) << 40) |
1804                (((PQ_64BIT)bytes[3]) << 32) |
1805                (((PQ_64BIT)bytes[4]) << 24) |
1806                (((PQ_64BIT)bytes[5]) << 16) |
1807                (((PQ_64BIT)bytes[6]) <<  8) |
1808                (((PQ_64BIT)bytes[7])      );
1809
1810            *num = _num ;
1811        return _num;
1812        }
1813 #endif
1814
1815
1816 static void
1817 dtls1_clear_timeouts(SSL *s)
1818         {
1819         memset(&(s->d1->timeout), 0x00, sizeof(struct dtls1_timeout_st));
1820         }