1/* ssl/d1_both.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 * --- 124 unchanged lines hidden (view full) --- 133 unsigned long frag_len); 134static unsigned char *dtls1_write_message_header(SSL *s, 135 unsigned char *p); 136static void dtls1_set_message_header_int(SSL *s, unsigned char mt, 137 unsigned long len, unsigned short seq_num, unsigned long frag_off, 138 unsigned long frag_len); 139static int dtls1_retransmit_buffered_messages(SSL *s); 140static long dtls1_get_message_fragment(SSL *s, int st1, int stn, |
141 long max, int *ok); |
142 143static hm_fragment * 144dtls1_hm_fragment_new(unsigned long frag_len) |
145 { 146 hm_fragment *frag = NULL; 147 unsigned char *buf = NULL; |
148 |
149 frag = (hm_fragment *)OPENSSL_malloc(sizeof(hm_fragment)); 150 if ( frag == NULL) 151 return NULL; |
152 |
153 if (frag_len) 154 { 155 buf = (unsigned char *)OPENSSL_malloc(frag_len); 156 if ( buf == NULL) 157 { 158 OPENSSL_free(frag); 159 return NULL; 160 } 161 } |
162 |
163 /* zero length fragment gets zero frag->fragment */ 164 frag->fragment = buf; |
165 |
166 return frag; 167 } 168 |
169static void 170dtls1_hm_fragment_free(hm_fragment *frag) |
171 { 172 if (frag->fragment) OPENSSL_free(frag->fragment); 173 OPENSSL_free(frag); 174 } |
175 176/* send s->init_buf in records of type 'type' (SSL3_RT_HANDSHAKE or SSL3_RT_CHANGE_CIPHER_SPEC) */ 177int dtls1_do_write(SSL *s, int type) 178 { 179 int ret; 180 int curr_mtu; 181 unsigned int len, frag_off; 182 183 /* AHA! Figure out the MTU, and stick to the right size */ 184 if ( ! (SSL_get_options(s) & SSL_OP_NO_QUERY_MTU)) |
185 { |
186 s->d1->mtu = 187 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL); 188 189 /* I've seen the kernel return bogus numbers when it doesn't know 190 * (initial write), so just make sure we have a reasonable number */ 191 if ( s->d1->mtu < dtls1_min_mtu()) 192 { 193 s->d1->mtu = 0; --- 10 unchanged lines hidden (view full) --- 204 mtu -= (DTLS1_HM_HEADER_LENGTH + DTLS1_RT_HEADER_LENGTH); 205 206 curr_mtu = mtu - BIO_wpending(SSL_get_wbio(s)); 207 208 if ( curr_mtu > 0) 209 mtu = curr_mtu; 210 else if ( ( ret = BIO_flush(SSL_get_wbio(s))) <= 0) 211 return ret; |
212 |
213 if ( BIO_wpending(SSL_get_wbio(s)) + s->init_num >= mtu) 214 { 215 ret = BIO_flush(SSL_get_wbio(s)); 216 if ( ret <= 0) 217 return ret; 218 mtu = s->d1->mtu - (DTLS1_HM_HEADER_LENGTH + DTLS1_RT_HEADER_LENGTH); 219 } 220 --- 30 unchanged lines hidden (view full) --- 251 if ( type == SSL3_RT_HANDSHAKE) 252 { 253 if ( s->init_off != 0) 254 { 255 OPENSSL_assert(s->init_off > DTLS1_HM_HEADER_LENGTH); 256 s->init_off -= DTLS1_HM_HEADER_LENGTH; 257 s->init_num += DTLS1_HM_HEADER_LENGTH; 258 |
259 /* write atleast DTLS1_HM_HEADER_LENGTH bytes */ |
260 if ( len <= DTLS1_HM_HEADER_LENGTH) 261 len += DTLS1_HM_HEADER_LENGTH; 262 } |
263 |
264 dtls1_fix_message_header(s, frag_off, 265 len - DTLS1_HM_HEADER_LENGTH); 266 267 dtls1_write_message_header(s, (unsigned char *)&s->init_buf->data[s->init_off]); 268 269 OPENSSL_assert(len >= DTLS1_HM_HEADER_LENGTH); 270 } 271 --- 11 unchanged lines hidden (view full) --- 283 BIO_CTRL_DGRAM_MTU_EXCEEDED, 0, NULL)) 284 s->d1->mtu = BIO_ctrl(SSL_get_wbio(s), 285 BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL); 286 else 287 return(-1); 288 } 289 else 290 { |
291 |
292 /* bad if this assert fails, only part of the handshake 293 * message got sent. but why would this happen? */ |
294 OPENSSL_assert(len == (unsigned int)ret); 295 |
296 if (type == SSL3_RT_HANDSHAKE && ! s->d1->retransmitting) |
297 { |
298 /* should not be done for 'Hello Request's, but in that case 299 * we'll ignore the result anyway */ |
300 unsigned char *p = &s->init_buf->data[s->init_off]; 301 const struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr; 302 int len; 303 304 if (frag_off == 0 && s->client_version != DTLS1_BAD_VER) 305 { 306 /* reconstruct message header is if it 307 * is being sent in single fragment */ 308 *p++ = msg_hdr->type; 309 l2n3(msg_hdr->msg_len,p); 310 s2n (msg_hdr->seq,p); 311 l2n3(0,p); 312 l2n3(msg_hdr->msg_len,p); 313 p -= DTLS1_HM_HEADER_LENGTH; 314 len = ret; 315 } 316 else 317 { 318 p += DTLS1_HM_HEADER_LENGTH; 319 len = ret - DTLS1_HM_HEADER_LENGTH; 320 } 321 322 ssl3_finish_mac(s, p, len); 323 } 324 |
325 if (ret == s->init_num) 326 { 327 if (s->msg_callback) 328 s->msg_callback(1, s->version, type, s->init_buf->data, 329 (size_t)(s->init_off + s->init_num), s, 330 s->msg_callback_arg); 331 332 s->init_off = 0; /* done writing this message */ 333 s->init_num = 0; |
334 |
335 return(1); 336 } 337 s->init_off+=ret; 338 s->init_num-=ret; 339 frag_off += (ret -= DTLS1_HM_HEADER_LENGTH); 340 } 341 } 342 return(0); 343 } 344 345 346/* Obtain handshake message of message type 'mt' (any if mt == -1), 347 * maximum acceptable body length 'max'. 348 * Read an entire handshake message. Handshake messages arrive in 349 * fragments. 350 */ 351long dtls1_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok) 352 { 353 int i, al; |
354 struct hm_header_st *msg_hdr; |
355 356 /* s3->tmp is used to store messages that are unexpected, caused 357 * by the absence of an optional handshake message */ 358 if (s->s3->tmp.reuse_message) 359 { 360 s->s3->tmp.reuse_message=0; 361 if ((mt >= 0) && (s->s3->tmp.message_type != mt)) 362 { 363 al=SSL_AD_UNEXPECTED_MESSAGE; 364 SSLerr(SSL_F_DTLS1_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE); 365 goto f_err; 366 } 367 *ok=1; 368 s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH; 369 s->init_num = (int)s->s3->tmp.message_size; 370 return s->init_num; 371 } |
372 373 msg_hdr = &s->d1->r_msg_hdr; |
374 do 375 { |
376 if ( msg_hdr->frag_off == 0) |
377 { 378 /* s->d1->r_message_header.msg_len = 0; */ |
379 memset(msg_hdr, 0x00, sizeof(struct hm_header_st)); |
380 } 381 382 i = dtls1_get_message_fragment(s, st1, stn, max, ok); 383 if ( i == DTLS1_HM_BAD_FRAGMENT || |
384 i == DTLS1_HM_FRAGMENT_RETRY) /* bad fragment received */ |
385 continue; 386 else if ( i <= 0 && !*ok) 387 return i; 388 |
389 /* Note that s->init_sum is used as a counter summing 390 * up fragments' lengths: as soon as they sum up to 391 * handshake packet length, we assume we have got all 392 * the fragments. Overlapping fragments would cause 393 * premature termination, so we don't expect overlaps. 394 * Well, handling overlaps would require something more 395 * drastic. Indeed, as it is now there is no way to 396 * tell if out-of-order fragment from the middle was 397 * the last. '>=' is the best/least we can do to control 398 * the potential damage caused by malformed overlaps. */ 399 if ((unsigned int)s->init_num >= msg_hdr->msg_len) |
400 { |
401 unsigned char *p = s->init_buf->data; 402 unsigned long msg_len = msg_hdr->msg_len; |
403 |
404 /* reconstruct message header as if it was 405 * sent in single fragment */ 406 *(p++) = msg_hdr->type; 407 l2n3(msg_len,p); 408 s2n (msg_hdr->seq,p); 409 l2n3(0,p); 410 l2n3(msg_len,p); 411 if (s->client_version != DTLS1_BAD_VER) 412 p -= DTLS1_HM_HEADER_LENGTH, 413 msg_len += DTLS1_HM_HEADER_LENGTH; 414 415 ssl3_finish_mac(s, p, msg_len); 416 if (s->msg_callback) 417 s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, 418 p, msg_len, 419 s, s->msg_callback_arg); 420 421 memset(msg_hdr, 0x00, sizeof(struct hm_header_st)); 422 |
423 s->d1->handshake_read_seq++; 424 /* we just read a handshake message from the other side: 425 * this means that we don't need to retransmit of the 426 * buffered messages. 427 * XDTLS: may be able clear out this 428 * buffer a little sooner (i.e if an out-of-order 429 * handshake message/record is received at the record 430 * layer. 431 * XDTLS: exception is that the server needs to 432 * know that change cipher spec and finished messages 433 * have been received by the client before clearing this 434 * buffer. this can simply be done by waiting for the 435 * first data segment, but is there a better way? */ 436 dtls1_clear_record_buffer(s); 437 |
438 s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH; 439 return s->init_num; |
440 } 441 else |
442 msg_hdr->frag_off = i; |
443 } while(1) ; 444 445f_err: 446 ssl3_send_alert(s,SSL3_AL_FATAL,al); 447 *ok = 0; 448 return -1; 449 } 450 451 |
452static int dtls1_preprocess_fragment(SSL *s,struct hm_header_st *msg_hdr,int max) 453 { 454 size_t frag_off,frag_len,msg_len; |
455 |
456 msg_len = msg_hdr->msg_len; 457 frag_off = msg_hdr->frag_off; 458 frag_len = msg_hdr->frag_len; |
459 |
460 /* sanity checking */ 461 if ( (frag_off+frag_len) > msg_len) 462 { 463 SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,SSL_R_EXCESSIVE_MESSAGE_SIZE); 464 return SSL_AD_ILLEGAL_PARAMETER; 465 } |
466 |
467 if ( (frag_off+frag_len) > (unsigned long)max) 468 { 469 SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,SSL_R_EXCESSIVE_MESSAGE_SIZE); 470 return SSL_AD_ILLEGAL_PARAMETER; 471 } |
472 |
473 if ( s->d1->r_msg_hdr.frag_off == 0) /* first fragment */ 474 { 475 /* msg_len is limited to 2^24, but is effectively checked 476 * against max above */ 477 if (!BUF_MEM_grow_clean(s->init_buf,(int)msg_len+DTLS1_HM_HEADER_LENGTH)) 478 { 479 SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,ERR_R_BUF_LIB); 480 return SSL_AD_INTERNAL_ERROR; 481 } |
482 |
483 s->s3->tmp.message_size = msg_len; 484 s->d1->r_msg_hdr.msg_len = msg_len; 485 s->s3->tmp.message_type = msg_hdr->type; 486 s->d1->r_msg_hdr.type = msg_hdr->type; 487 s->d1->r_msg_hdr.seq = msg_hdr->seq; 488 } 489 else if (msg_len != s->d1->r_msg_hdr.msg_len) 490 { 491 /* They must be playing with us! BTW, failure to enforce 492 * upper limit would open possibility for buffer overrun. */ 493 SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,SSL_R_EXCESSIVE_MESSAGE_SIZE); 494 return SSL_AD_ILLEGAL_PARAMETER; 495 } |
496 |
497 return 0; /* no error */ 498 } |
499 |
500 |
501static int |
502dtls1_retrieve_buffered_fragment(SSL *s, long max, int *ok) 503 { 504 /* (0) check whether the desired fragment is available 505 * if so: 506 * (1) copy over the fragment to s->init_buf->data[] 507 * (2) update s->init_num 508 */ 509 pitem *item; 510 hm_fragment *frag; 511 int al; |
512 |
513 *ok = 0; 514 item = pqueue_peek(s->d1->buffered_messages); 515 if ( item == NULL) 516 return 0; |
517 |
518 frag = (hm_fragment *)item->data; |
519 |
520 if ( s->d1->handshake_read_seq == frag->msg_header.seq) 521 { 522 pqueue_pop(s->d1->buffered_messages); |
523 |
524 al=dtls1_preprocess_fragment(s,&frag->msg_header,max); |
525 |
526 if (al==0) /* no alert */ 527 { 528 unsigned char *p = s->init_buf->data+DTLS1_HM_HEADER_LENGTH; 529 memcpy(&p[frag->msg_header.frag_off], 530 frag->fragment,frag->msg_header.frag_len); 531 } |
532 |
533 dtls1_hm_fragment_free(frag); 534 pitem_free(item); |
535 |
536 if (al==0) 537 { 538 *ok = 1; 539 return frag->msg_header.frag_len; 540 } |
541 |
542 ssl3_send_alert(s,SSL3_AL_FATAL,al); 543 s->init_num = 0; 544 *ok = 0; 545 return -1; 546 } 547 else 548 return 0; 549 } |
550 551 |
552static int 553dtls1_process_out_of_seq_message(SSL *s, struct hm_header_st* msg_hdr, int *ok) 554{ 555 int i=-1; 556 hm_fragment *frag = NULL; 557 pitem *item = NULL; 558 PQ_64BIT seq64; 559 unsigned long frag_len = msg_hdr->frag_len; |
560 |
561 if ((msg_hdr->frag_off+frag_len) > msg_hdr->msg_len) 562 goto err; |
563 |
564 if (msg_hdr->seq <= s->d1->handshake_read_seq) 565 { 566 unsigned char devnull [256]; |
567 |
568 while (frag_len) 569 { 570 i = s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE, 571 devnull, 572 frag_len>sizeof(devnull)?sizeof(devnull):frag_len,0); 573 if (i<=0) goto err; 574 frag_len -= i; 575 } 576 } |
577 |
578 frag = dtls1_hm_fragment_new(frag_len); 579 if ( frag == NULL) 580 goto err; |
581 |
582 memcpy(&(frag->msg_header), msg_hdr, sizeof(*msg_hdr)); |
583 |
584 if (frag_len) |
585 { |
586 /* read the body of the fragment (header has already been read */ 587 i = s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE, 588 frag->fragment,frag_len,0); 589 if (i<=0 || (unsigned long)i!=frag_len) 590 goto err; |
591 } 592 |
593 pq_64bit_init(&seq64); 594 pq_64bit_assign_word(&seq64, msg_hdr->seq); |
595 |
596 item = pitem_new(seq64, frag); 597 pq_64bit_free(&seq64); 598 if ( item == NULL) 599 goto err; 600 601 pqueue_insert(s->d1->buffered_messages, item); 602 return DTLS1_HM_FRAGMENT_RETRY; 603 |
604err: |
605 if ( frag != NULL) dtls1_hm_fragment_free(frag); 606 if ( item != NULL) OPENSSL_free(item); 607 *ok = 0; 608 return i; 609 } |
610 611 612static long 613dtls1_get_message_fragment(SSL *s, int st1, int stn, long max, int *ok) 614 { |
615 unsigned char wire[DTLS1_HM_HEADER_LENGTH]; |
616 unsigned long l, frag_off, frag_len; 617 int i,al; 618 struct hm_header_st msg_hdr; |
619 |
620 /* see if we have the required fragment already */ 621 if ((frag_len = dtls1_retrieve_buffered_fragment(s,max,ok)) || *ok) 622 { 623 if (*ok) s->init_num += frag_len; 624 return frag_len; 625 } |
626 |
627 /* read handshake message header */ 628 i=s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,wire, |
629 DTLS1_HM_HEADER_LENGTH, 0); 630 if (i <= 0) /* nbio, or an error */ 631 { 632 s->rwstate=SSL_READING; 633 *ok = 0; 634 return i; 635 } |
636 OPENSSL_assert(i == DTLS1_HM_HEADER_LENGTH); 637 |
638 /* parse the message fragment header */ 639 dtls1_get_message_header(wire, &msg_hdr); |
640 |
641 /* 642 * if this is a future (or stale) message it gets buffered 643 * (or dropped)--no further processing at this time 644 */ 645 if ( msg_hdr.seq != s->d1->handshake_read_seq) 646 return dtls1_process_out_of_seq_message(s, &msg_hdr, ok); |
647 |
648 l = msg_hdr.msg_len; 649 frag_off = msg_hdr.frag_off; |
650 frag_len = msg_hdr.frag_len; 651 |
652 if (!s->server && s->d1->r_msg_hdr.frag_off == 0 && |
653 wire[0] == SSL3_MT_HELLO_REQUEST) |
654 { |
655 /* The server may always send 'Hello Request' messages -- 656 * we are doing a handshake anyway now, so ignore them 657 * if their format is correct. Does not count for 658 * 'Finished' MAC. */ 659 if (wire[1] == 0 && wire[2] == 0 && wire[3] == 0) |
660 { |
661 if (s->msg_callback) 662 s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, 663 wire, DTLS1_HM_HEADER_LENGTH, s, 664 s->msg_callback_arg); 665 666 s->init_num = 0; 667 return dtls1_get_message_fragment(s, st1, stn, 668 max, ok); |
669 } |
670 else /* Incorrectly formated Hello request */ |
671 { |
672 al=SSL_AD_UNEXPECTED_MESSAGE; 673 SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT,SSL_R_UNEXPECTED_MESSAGE); |
674 goto f_err; 675 } |
676 } 677 |
678 if ((al=dtls1_preprocess_fragment(s,&msg_hdr,max))) 679 goto f_err; |
680 |
681 /* XDTLS: ressurect this when restart is in place */ 682 s->state=stn; |
683 684 if ( frag_len > 0) 685 { |
686 unsigned char *p=s->init_buf->data+DTLS1_HM_HEADER_LENGTH; 687 |
688 i=s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE, |
689 &p[frag_off],frag_len,0); 690 /* XDTLS: fix this--message fragments cannot span multiple packets */ |
691 if (i <= 0) 692 { 693 s->rwstate=SSL_READING; 694 *ok = 0; 695 return i; 696 } 697 } 698 else 699 i = 0; 700 |
701 /* XDTLS: an incorrectly formatted fragment should cause the 702 * handshake to fail */ |
703 OPENSSL_assert(i == (int)frag_len); 704 |
705 *ok = 1; |
706 |
707 /* Note that s->init_num is *not* used as current offset in 708 * s->init_buf->data, but as a counter summing up fragments' 709 * lengths: as soon as they sum up to handshake packet 710 * length, we assume we have got all the fragments. */ 711 s->init_num += frag_len; 712 return frag_len; |
713 |
714f_err: 715 ssl3_send_alert(s,SSL3_AL_FATAL,al); |
716 s->init_num = 0; 717 |
718 *ok=0; 719 return(-1); 720 } 721 722int dtls1_send_finished(SSL *s, int a, int b, const char *sender, int slen) 723 { 724 unsigned char *p,*d; 725 int i; --- 21 unchanged lines hidden (view full) --- 747#endif 748 749 d = dtls1_set_message_header(s, d, SSL3_MT_FINISHED, l, 0, l); 750 s->init_num=(int)l+DTLS1_HM_HEADER_LENGTH; 751 s->init_off=0; 752 753 /* buffer the message to handle re-xmits */ 754 dtls1_buffer_message(s, 0); |
755 |
756 s->state=b; 757 } 758 759 /* SSL3_ST_SEND_xxxxxx_HELLO_B */ 760 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 761 } 762 763/* for these 2 messages, we need to --- 9 unchanged lines hidden (view full) --- 773 unsigned char *p; 774 775 if (s->state == a) 776 { 777 p=(unsigned char *)s->init_buf->data; 778 *p++=SSL3_MT_CCS; 779 s->d1->handshake_write_seq = s->d1->next_handshake_write_seq; 780 s->d1->next_handshake_write_seq++; |
781 s->init_num=DTLS1_CCS_HEADER_LENGTH; |
782 783 if (s->client_version == DTLS1_BAD_VER) 784 { 785 s2n(s->d1->handshake_write_seq,p); 786 s->init_num+=2; 787 } 788 |
789 s->init_off=0; 790 791 dtls1_set_message_header_int(s, SSL3_MT_CCS, 0, 792 s->d1->handshake_write_seq, 0, 0); 793 794 /* buffer the message to handle re-xmits */ 795 dtls1_buffer_message(s, 1); 796 --- 80 unchanged lines hidden (view full) --- 877 p=(unsigned char *)&(buf->data[0]); 878 p = dtls1_set_message_header(s, p, SSL3_MT_CERTIFICATE, l, 0, l); 879 880 l+=DTLS1_HM_HEADER_LENGTH; 881 return(l); 882 } 883 884int dtls1_read_failed(SSL *s, int code) |
885 { 886 DTLS1_STATE *state; 887 BIO *bio; 888 int send_alert = 0; |
889 |
890 if ( code > 0) 891 { 892 fprintf( stderr, "invalid state reached %s:%d", __FILE__, __LINE__); 893 return 1; 894 } |
895 |
896 bio = SSL_get_rbio(s); 897 if ( ! BIO_dgram_recv_timedout(bio)) 898 { 899 /* not a timeout, none of our business, 900 let higher layers handle this. in fact it's probably an error */ 901 return code; 902 } |
903 |
904 if ( ! SSL_in_init(s)) /* done, no need to send a retransmit */ 905 { 906 BIO_set_flags(SSL_get_rbio(s), BIO_FLAGS_READ); 907 return code; 908 } |
909 |
910 state = s->d1; 911 state->timeout.num_alerts++; 912 if ( state->timeout.num_alerts > DTLS1_TMO_ALERT_COUNT) 913 { 914 /* fail the connection, enough alerts have been sent */ 915 SSLerr(SSL_F_DTLS1_READ_FAILED,SSL_R_READ_TIMEOUT_EXPIRED); 916 return 0; 917 } |
918 |
919 state->timeout.read_timeouts++; 920 if ( state->timeout.read_timeouts > DTLS1_TMO_READ_COUNT) 921 { 922 send_alert = 1; 923 state->timeout.read_timeouts = 1; 924 } 925 926 |
927#if 0 /* for now, each alert contains only one record number */ |
928 item = pqueue_peek(state->rcvd_records); 929 if ( item ) 930 { 931 /* send an alert immediately for all the missing records */ 932 } 933 else |
934#endif 935 936#if 0 /* no more alert sending, just retransmit the last set of messages */ |
937 if ( send_alert) 938 ssl3_send_alert(s,SSL3_AL_WARNING, 939 DTLS1_AD_MISSING_HANDSHAKE_MESSAGE); |
940#endif 941 |
942 return dtls1_retransmit_buffered_messages(s) ; 943 } |
944 945 946static int 947dtls1_retransmit_buffered_messages(SSL *s) |
948 { 949 pqueue sent = s->d1->sent_messages; 950 piterator iter; 951 pitem *item; 952 hm_fragment *frag; 953 int found = 0; |
954 |
955 iter = pqueue_iterator(sent); |
956 |
957 for ( item = pqueue_next(&iter); item != NULL; item = pqueue_next(&iter)) 958 { 959 frag = (hm_fragment *)item->data; 960 if ( dtls1_retransmit_message(s, frag->msg_header.seq, 0, &found) <= 0 && 961 found) 962 { 963 fprintf(stderr, "dtls1_retransmit_message() failed\n"); 964 return -1; 965 } 966 } |
967 |
968 return 1; 969 } |
970 |
971int 972dtls1_buffer_message(SSL *s, int is_ccs) |
973 { 974 pitem *item; 975 hm_fragment *frag; |
976 PQ_64BIT seq64; 977 |
978 /* this function is called immediately after a message has 979 * been serialized */ 980 OPENSSL_assert(s->init_off == 0); |
981 |
982 frag = dtls1_hm_fragment_new(s->init_num); |
983 |
984 memcpy(frag->fragment, s->init_buf->data, s->init_num); |
985 |
986 if ( is_ccs) 987 { 988 OPENSSL_assert(s->d1->w_msg_hdr.msg_len + 989 DTLS1_CCS_HEADER_LENGTH <= (unsigned int)s->init_num); 990 } 991 else 992 { 993 OPENSSL_assert(s->d1->w_msg_hdr.msg_len + 994 DTLS1_HM_HEADER_LENGTH == (unsigned int)s->init_num); 995 } |
996 |
997 frag->msg_header.msg_len = s->d1->w_msg_hdr.msg_len; 998 frag->msg_header.seq = s->d1->w_msg_hdr.seq; 999 frag->msg_header.type = s->d1->w_msg_hdr.type; 1000 frag->msg_header.frag_off = 0; 1001 frag->msg_header.frag_len = s->d1->w_msg_hdr.msg_len; 1002 frag->msg_header.is_ccs = is_ccs; |
1003 |
1004 pq_64bit_init(&seq64); 1005 pq_64bit_assign_word(&seq64, frag->msg_header.seq); |
1006 |
1007 item = pitem_new(seq64, frag); 1008 pq_64bit_free(&seq64); 1009 if ( item == NULL) 1010 { 1011 dtls1_hm_fragment_free(frag); 1012 return 0; 1013 } |
1014 1015#if 0 |
1016 fprintf( stderr, "buffered messge: \ttype = %xx\n", msg_buf->type); 1017 fprintf( stderr, "\t\t\t\t\tlen = %d\n", msg_buf->len); 1018 fprintf( stderr, "\t\t\t\t\tseq_num = %d\n", msg_buf->seq_num); |
1019#endif 1020 |
1021 pqueue_insert(s->d1->sent_messages, item); 1022 return 1; 1023 } |
1024 1025int 1026dtls1_retransmit_message(SSL *s, unsigned short seq, unsigned long frag_off, |
1027 int *found) 1028 { 1029 int ret; 1030 /* XDTLS: for now assuming that read/writes are blocking */ 1031 pitem *item; 1032 hm_fragment *frag ; 1033 unsigned long header_length; |
1034 PQ_64BIT seq64; 1035 |
1036 /* 1037 OPENSSL_assert(s->init_num == 0); 1038 OPENSSL_assert(s->init_off == 0); 1039 */ |
1040 |
1041 /* XDTLS: the requested message ought to be found, otherwise error */ 1042 pq_64bit_init(&seq64); 1043 pq_64bit_assign_word(&seq64, seq); |
1044 |
1045 item = pqueue_find(s->d1->sent_messages, seq64); 1046 pq_64bit_free(&seq64); 1047 if ( item == NULL) 1048 { 1049 fprintf(stderr, "retransmit: message %d non-existant\n", seq); 1050 *found = 0; 1051 return 0; 1052 } |
1053 |
1054 *found = 1; 1055 frag = (hm_fragment *)item->data; |
1056 |
1057 if ( frag->msg_header.is_ccs) 1058 header_length = DTLS1_CCS_HEADER_LENGTH; 1059 else 1060 header_length = DTLS1_HM_HEADER_LENGTH; |
1061 |
1062 memcpy(s->init_buf->data, frag->fragment, 1063 frag->msg_header.msg_len + header_length); 1064 s->init_num = frag->msg_header.msg_len + header_length; |
1065 |
1066 dtls1_set_message_header_int(s, frag->msg_header.type, 1067 frag->msg_header.msg_len, frag->msg_header.seq, 0, 1068 frag->msg_header.frag_len); |
1069 |
1070 s->d1->retransmitting = 1; 1071 ret = dtls1_do_write(s, frag->msg_header.is_ccs ? 1072 SSL3_RT_CHANGE_CIPHER_SPEC : SSL3_RT_HANDSHAKE); 1073 s->d1->retransmitting = 0; |
1074 |
1075 (void)BIO_flush(SSL_get_wbio(s)); 1076 return ret; 1077 } 1078 |
1079/* call this function when the buffered messages are no longer needed */ 1080void 1081dtls1_clear_record_buffer(SSL *s) |
1082 { 1083 pitem *item; |
1084 |
1085 for(item = pqueue_pop(s->d1->sent_messages); 1086 item != NULL; item = pqueue_pop(s->d1->sent_messages)) 1087 { 1088 dtls1_hm_fragment_free((hm_fragment *)item->data); 1089 pitem_free(item); 1090 } 1091 } |
1092 |
1093 |
1094unsigned char * 1095dtls1_set_message_header(SSL *s, unsigned char *p, unsigned char mt, |
1096 unsigned long len, unsigned long frag_off, unsigned long frag_len) 1097 { 1098 if ( frag_off == 0) 1099 { 1100 s->d1->handshake_write_seq = s->d1->next_handshake_write_seq; 1101 s->d1->next_handshake_write_seq++; 1102 } |
1103 |
1104 dtls1_set_message_header_int(s, mt, len, s->d1->handshake_write_seq, 1105 frag_off, frag_len); |
1106 |
1107 return p += DTLS1_HM_HEADER_LENGTH; 1108 } 1109 1110 |
1111/* don't actually do the writing, wait till the MTU has been retrieved */ 1112static void 1113dtls1_set_message_header_int(SSL *s, unsigned char mt, |
1114 unsigned long len, unsigned short seq_num, unsigned long frag_off, 1115 unsigned long frag_len) 1116 { 1117 struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr; |
1118 |
1119 msg_hdr->type = mt; 1120 msg_hdr->msg_len = len; 1121 msg_hdr->seq = seq_num; 1122 msg_hdr->frag_off = frag_off; 1123 msg_hdr->frag_len = frag_len; 1124 } 1125 |
1126static void 1127dtls1_fix_message_header(SSL *s, unsigned long frag_off, |
1128 unsigned long frag_len) 1129 { 1130 struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr; |
1131 |
1132 msg_hdr->frag_off = frag_off; 1133 msg_hdr->frag_len = frag_len; 1134 } 1135 |
1136static unsigned char * 1137dtls1_write_message_header(SSL *s, unsigned char *p) |
1138 { 1139 struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr; |
1140 |
1141 *p++ = msg_hdr->type; 1142 l2n3(msg_hdr->msg_len, p); 1143 1144 s2n(msg_hdr->seq, p); 1145 l2n3(msg_hdr->frag_off, p); 1146 l2n3(msg_hdr->frag_len, p); 1147 1148 return p; 1149 } 1150 |
1151static unsigned int 1152dtls1_min_mtu(void) |
1153 { 1154 return (g_probable_mtu[(sizeof(g_probable_mtu) / 1155 sizeof(g_probable_mtu[0])) - 1]); 1156 } |
1157 1158static unsigned int 1159dtls1_guess_mtu(unsigned int curr_mtu) 1160 { 1161 size_t i; 1162 1163 if ( curr_mtu == 0 ) 1164 return g_probable_mtu[0] ; 1165 1166 for ( i = 0; i < sizeof(g_probable_mtu)/sizeof(g_probable_mtu[0]); i++) 1167 if ( curr_mtu > g_probable_mtu[i]) 1168 return g_probable_mtu[i]; |
1169 |
1170 return curr_mtu; 1171 } 1172 1173void 1174dtls1_get_message_header(unsigned char *data, struct hm_header_st *msg_hdr) |
1175 { 1176 memset(msg_hdr, 0x00, sizeof(struct hm_header_st)); 1177 msg_hdr->type = *(data++); 1178 n2l3(data, msg_hdr->msg_len); |
1179 |
1180 n2s(data, msg_hdr->seq); 1181 n2l3(data, msg_hdr->frag_off); 1182 n2l3(data, msg_hdr->frag_len); 1183 } 1184 |
1185void 1186dtls1_get_ccs_header(unsigned char *data, struct ccs_header_st *ccs_hdr) |
1187 { 1188 memset(ccs_hdr, 0x00, sizeof(struct ccs_header_st)); 1189 1190 ccs_hdr->type = *(data++); 1191 } |