3 * DTLS implementation written by Nagendra Modadugu
4 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
6 /* ====================================================================
7 * Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
35 * 6. Redistributions of any form whatsoever must retain the following
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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 * ====================================================================
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).
59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
60 * All rights reserved.
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.
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).
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.
80 * Redistribution and use in source and binary forms, with or without
81 * modification, are permitted provided that the following conditions
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)"
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
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.]
119 #include "ssl_locl.h"
120 #include <openssl/buffer.h>
121 #include <openssl/rand.h>
122 #include <openssl/objects.h>
123 #include <openssl/evp.h>
124 #include <openssl/x509.h>
126 #define RSMBLY_BITMASK_SIZE(msg_len) (((msg_len) + 7) / 8)
128 #define RSMBLY_BITMASK_MARK(bitmask, start, end) { \
129 if ((end) - (start) <= 8) { \
131 for (ii = (start); ii < (end); ii++) bitmask[((ii) >> 3)] |= (1 << ((ii) & 7)); \
134 bitmask[((start) >> 3)] |= bitmask_start_values[((start) & 7)]; \
135 for (ii = (((start) >> 3) + 1); ii < ((((end) - 1)) >> 3); ii++) bitmask[ii] = 0xff; \
136 bitmask[(((end) - 1) >> 3)] |= bitmask_end_values[((end) & 7)]; \
139 #define RSMBLY_BITMASK_IS_COMPLETE(bitmask, msg_len, is_complete) { \
141 OPENSSL_assert((msg_len) > 0); \
143 if (bitmask[(((msg_len) - 1) >> 3)] != bitmask_end_values[((msg_len) & 7)]) is_complete = 0; \
144 if (is_complete) for (ii = (((msg_len) - 1) >> 3) - 1; ii >= 0 ; ii--) \
145 if (bitmask[ii] != 0xff) { is_complete = 0; break; } }
148 #define RSMBLY_BITMASK_PRINT(bitmask, msg_len) { \
150 printf("bitmask: "); for (ii = 0; ii < (msg_len); ii++) \
151 printf("%d ", (bitmask[ii >> 3] & (1 << (ii & 7))) >> (ii & 7)); \
155 static unsigned char bitmask_start_values
[] = {0xff, 0xfe, 0xfc, 0xf8, 0xf0, 0xe0, 0xc0, 0x80};
156 static unsigned char bitmask_end_values
[] = {0xff, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f};
158 /* XDTLS: figure out the right values */
159 static unsigned int g_probable_mtu
[] = {1500 - 28, 512 - 28, 256 - 28};
161 static unsigned int dtls1_guess_mtu(unsigned int curr_mtu
);
162 static void dtls1_fix_message_header(SSL
*s
, unsigned long frag_off
,
163 unsigned long frag_len
);
164 static unsigned char *dtls1_write_message_header(SSL
*s
,
166 static void dtls1_set_message_header_int(SSL
*s
, unsigned char mt
,
167 unsigned long len
, unsigned short seq_num
, unsigned long frag_off
,
168 unsigned long frag_len
);
169 static long dtls1_get_message_fragment(SSL
*s
, int st1
, int stn
,
173 dtls1_hm_fragment_new(unsigned long frag_len
, int reassembly
)
175 hm_fragment
*frag
= NULL
;
176 unsigned char *buf
= NULL
;
177 unsigned char *bitmask
= NULL
;
179 frag
= (hm_fragment
*)OPENSSL_malloc(sizeof(hm_fragment
));
185 buf
= (unsigned char *)OPENSSL_malloc(frag_len
);
193 /* zero length fragment gets zero frag->fragment */
194 frag
->fragment
= buf
;
196 /* Initialize reassembly bitmask if necessary */
199 bitmask
= (unsigned char *)OPENSSL_malloc(RSMBLY_BITMASK_SIZE(frag_len
));
202 if (buf
!= NULL
) OPENSSL_free(buf
);
206 memset(bitmask
, 0, RSMBLY_BITMASK_SIZE(frag_len
));
209 frag
->reassembly
= bitmask
;
215 dtls1_hm_fragment_free(hm_fragment
*frag
)
217 if (frag
->fragment
) OPENSSL_free(frag
->fragment
);
218 if (frag
->reassembly
) OPENSSL_free(frag
->reassembly
);
222 /* send s->init_buf in records of type 'type' (SSL3_RT_HANDSHAKE or SSL3_RT_CHANGE_CIPHER_SPEC) */
223 int dtls1_do_write(SSL
*s
, int type
)
227 unsigned int len
, frag_off
, mac_size
, blocksize
;
229 /* AHA! Figure out the MTU, and stick to the right size */
230 if (s
->d1
->mtu
< dtls1_min_mtu() && !(SSL_get_options(s
) & SSL_OP_NO_QUERY_MTU
))
233 BIO_ctrl(SSL_get_wbio(s
), BIO_CTRL_DGRAM_QUERY_MTU
, 0, NULL
);
235 /* I've seen the kernel return bogus numbers when it doesn't know
236 * (initial write), so just make sure we have a reasonable number */
237 if (s
->d1
->mtu
< dtls1_min_mtu())
240 s
->d1
->mtu
= dtls1_guess_mtu(s
->d1
->mtu
);
241 BIO_ctrl(SSL_get_wbio(s
), BIO_CTRL_DGRAM_SET_MTU
,
248 fprintf(stderr
, "using MTU = %d\n", mtu
);
250 mtu
-= (DTLS1_HM_HEADER_LENGTH
+ DTLS1_RT_HEADER_LENGTH
);
252 curr_mtu
= mtu
- BIO_wpending(SSL_get_wbio(s
));
256 else if ( ( ret
= BIO_flush(SSL_get_wbio(s
))) <= 0)
259 if ( BIO_wpending(SSL_get_wbio(s
)) + s
->init_num
>= mtu
)
261 ret
= BIO_flush(SSL_get_wbio(s
));
264 mtu
= s
->d1
->mtu
- (DTLS1_HM_HEADER_LENGTH
+ DTLS1_RT_HEADER_LENGTH
);
268 OPENSSL_assert(s
->d1
->mtu
>= dtls1_min_mtu()); /* should have something reasonable now */
270 if ( s
->init_off
== 0 && type
== SSL3_RT_HANDSHAKE
)
271 OPENSSL_assert(s
->init_num
==
272 (int)s
->d1
->w_msg_hdr
.msg_len
+ DTLS1_HM_HEADER_LENGTH
);
275 mac_size
= EVP_MD_size(s
->write_hash
);
279 if (s
->enc_write_ctx
&&
280 (EVP_CIPHER_mode( s
->enc_write_ctx
->cipher
) & EVP_CIPH_CBC_MODE
))
281 blocksize
= 2 * EVP_CIPHER_block_size(s
->enc_write_ctx
->cipher
);
288 curr_mtu
= s
->d1
->mtu
- BIO_wpending(SSL_get_wbio(s
)) -
289 DTLS1_RT_HEADER_LENGTH
- mac_size
- blocksize
;
291 if ( curr_mtu
<= DTLS1_HM_HEADER_LENGTH
)
293 /* grr.. we could get an error if MTU picked was wrong */
294 ret
= BIO_flush(SSL_get_wbio(s
));
297 curr_mtu
= s
->d1
->mtu
- DTLS1_RT_HEADER_LENGTH
-
298 mac_size
- blocksize
;
301 if ( s
->init_num
> curr_mtu
)
307 /* XDTLS: this function is too long. split out the CCS part */
308 if ( type
== SSL3_RT_HANDSHAKE
)
310 if ( s
->init_off
!= 0)
312 OPENSSL_assert(s
->init_off
> DTLS1_HM_HEADER_LENGTH
);
313 s
->init_off
-= DTLS1_HM_HEADER_LENGTH
;
314 s
->init_num
+= DTLS1_HM_HEADER_LENGTH
;
316 if ( s
->init_num
> curr_mtu
)
322 dtls1_fix_message_header(s
, frag_off
,
323 len
- DTLS1_HM_HEADER_LENGTH
);
325 dtls1_write_message_header(s
, (unsigned char *)&s
->init_buf
->data
[s
->init_off
]);
327 OPENSSL_assert(len
>= DTLS1_HM_HEADER_LENGTH
);
330 ret
=dtls1_write_bytes(s
,type
,&s
->init_buf
->data
[s
->init_off
],
334 /* might need to update MTU here, but we don't know
335 * which previous packet caused the failure -- so can't
336 * really retransmit anything. continue as if everything
337 * is fine and wait for an alert to handle the
340 if ( BIO_ctrl(SSL_get_wbio(s
),
341 BIO_CTRL_DGRAM_MTU_EXCEEDED
, 0, NULL
) > 0 )
342 s
->d1
->mtu
= BIO_ctrl(SSL_get_wbio(s
),
343 BIO_CTRL_DGRAM_QUERY_MTU
, 0, NULL
);
350 /* bad if this assert fails, only part of the handshake
351 * message got sent. but why would this happen? */
352 OPENSSL_assert(len
== (unsigned int)ret
);
354 if (type
== SSL3_RT_HANDSHAKE
&& ! s
->d1
->retransmitting
)
356 /* should not be done for 'Hello Request's, but in that case
357 * we'll ignore the result anyway */
358 unsigned char *p
= (unsigned char *)&s
->init_buf
->data
[s
->init_off
];
359 const struct hm_header_st
*msg_hdr
= &s
->d1
->w_msg_hdr
;
362 if (frag_off
== 0 && s
->client_version
!= DTLS1_BAD_VER
)
364 /* reconstruct message header is if it
365 * is being sent in single fragment */
366 *p
++ = msg_hdr
->type
;
367 l2n3(msg_hdr
->msg_len
,p
);
368 s2n (msg_hdr
->seq
,p
);
370 l2n3(msg_hdr
->msg_len
,p
);
371 p
-= DTLS1_HM_HEADER_LENGTH
;
376 p
+= DTLS1_HM_HEADER_LENGTH
;
377 xlen
= ret
- DTLS1_HM_HEADER_LENGTH
;
380 ssl3_finish_mac(s
, p
, xlen
);
383 if (ret
== s
->init_num
)
386 s
->msg_callback(1, s
->version
, type
, s
->init_buf
->data
,
387 (size_t)(s
->init_off
+ s
->init_num
), s
,
388 s
->msg_callback_arg
);
390 s
->init_off
= 0; /* done writing this message */
397 frag_off
+= (ret
-= DTLS1_HM_HEADER_LENGTH
);
404 /* Obtain handshake message of message type 'mt' (any if mt == -1),
405 * maximum acceptable body length 'max'.
406 * Read an entire handshake message. Handshake messages arrive in
409 long dtls1_get_message(SSL
*s
, int st1
, int stn
, int mt
, long max
, int *ok
)
412 struct hm_header_st
*msg_hdr
;
414 unsigned long msg_len
;
416 /* s3->tmp is used to store messages that are unexpected, caused
417 * by the absence of an optional handshake message */
418 if (s
->s3
->tmp
.reuse_message
)
420 s
->s3
->tmp
.reuse_message
=0;
421 if ((mt
>= 0) && (s
->s3
->tmp
.message_type
!= mt
))
423 al
=SSL_AD_UNEXPECTED_MESSAGE
;
424 SSLerr(SSL_F_DTLS1_GET_MESSAGE
,SSL_R_UNEXPECTED_MESSAGE
);
428 s
->init_msg
= s
->init_buf
->data
+ DTLS1_HM_HEADER_LENGTH
;
429 s
->init_num
= (int)s
->s3
->tmp
.message_size
;
433 msg_hdr
= &s
->d1
->r_msg_hdr
;
434 memset(msg_hdr
, 0x00, sizeof(struct hm_header_st
));
437 i
= dtls1_get_message_fragment(s
, st1
, stn
, max
, ok
);
438 if ( i
== DTLS1_HM_BAD_FRAGMENT
||
439 i
== DTLS1_HM_FRAGMENT_RETRY
) /* bad fragment received */
441 else if ( i
<= 0 && !*ok
)
444 p
= (unsigned char *)s
->init_buf
->data
;
445 msg_len
= msg_hdr
->msg_len
;
447 /* reconstruct message header */
448 *(p
++) = msg_hdr
->type
;
450 s2n (msg_hdr
->seq
,p
);
453 if (s
->version
!= DTLS1_BAD_VER
) {
454 p
-= DTLS1_HM_HEADER_LENGTH
;
455 msg_len
+= DTLS1_HM_HEADER_LENGTH
;
458 ssl3_finish_mac(s
, p
, msg_len
);
460 s
->msg_callback(0, s
->version
, SSL3_RT_HANDSHAKE
,
462 s
, s
->msg_callback_arg
);
464 memset(msg_hdr
, 0x00, sizeof(struct hm_header_st
));
466 /* Don't change sequence numbers while listening */
468 s
->d1
->handshake_read_seq
++;
470 s
->init_msg
= s
->init_buf
->data
+ DTLS1_HM_HEADER_LENGTH
;
474 ssl3_send_alert(s
,SSL3_AL_FATAL
,al
);
480 static int dtls1_preprocess_fragment(SSL
*s
,struct hm_header_st
*msg_hdr
,int max
)
482 size_t frag_off
,frag_len
,msg_len
;
484 msg_len
= msg_hdr
->msg_len
;
485 frag_off
= msg_hdr
->frag_off
;
486 frag_len
= msg_hdr
->frag_len
;
488 /* sanity checking */
489 if ( (frag_off
+frag_len
) > msg_len
)
491 SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT
,SSL_R_EXCESSIVE_MESSAGE_SIZE
);
492 return SSL_AD_ILLEGAL_PARAMETER
;
495 if ( (frag_off
+frag_len
) > (unsigned long)max
)
497 SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT
,SSL_R_EXCESSIVE_MESSAGE_SIZE
);
498 return SSL_AD_ILLEGAL_PARAMETER
;
501 if ( s
->d1
->r_msg_hdr
.frag_off
== 0) /* first fragment */
503 /* msg_len is limited to 2^24, but is effectively checked
504 * against max above */
505 if (!BUF_MEM_grow_clean(s
->init_buf
,(int)msg_len
+DTLS1_HM_HEADER_LENGTH
))
507 SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT
,ERR_R_BUF_LIB
);
508 return SSL_AD_INTERNAL_ERROR
;
511 s
->s3
->tmp
.message_size
= msg_len
;
512 s
->d1
->r_msg_hdr
.msg_len
= msg_len
;
513 s
->s3
->tmp
.message_type
= msg_hdr
->type
;
514 s
->d1
->r_msg_hdr
.type
= msg_hdr
->type
;
515 s
->d1
->r_msg_hdr
.seq
= msg_hdr
->seq
;
517 else if (msg_len
!= s
->d1
->r_msg_hdr
.msg_len
)
519 /* They must be playing with us! BTW, failure to enforce
520 * upper limit would open possibility for buffer overrun. */
521 SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT
,SSL_R_EXCESSIVE_MESSAGE_SIZE
);
522 return SSL_AD_ILLEGAL_PARAMETER
;
525 return 0; /* no error */
530 dtls1_retrieve_buffered_fragment(SSL
*s
, long max
, int *ok
)
532 /* (0) check whether the desired fragment is available
534 * (1) copy over the fragment to s->init_buf->data[]
535 * (2) update s->init_num
542 item
= pqueue_peek(s
->d1
->buffered_messages
);
546 frag
= (hm_fragment
*)item
->data
;
548 /* Don't return if reassembly still in progress */
549 if (frag
->reassembly
!= NULL
)
552 if ( s
->d1
->handshake_read_seq
== frag
->msg_header
.seq
)
554 unsigned long frag_len
= frag
->msg_header
.frag_len
;
555 pqueue_pop(s
->d1
->buffered_messages
);
557 al
=dtls1_preprocess_fragment(s
,&frag
->msg_header
,max
);
559 if (al
==0) /* no alert */
561 unsigned char *p
= (unsigned char *)s
->init_buf
->data
+DTLS1_HM_HEADER_LENGTH
;
562 memcpy(&p
[frag
->msg_header
.frag_off
],
563 frag
->fragment
,frag
->msg_header
.frag_len
);
566 dtls1_hm_fragment_free(frag
);
575 ssl3_send_alert(s
,SSL3_AL_FATAL
,al
);
584 /* dtls1_max_handshake_message_len returns the maximum number of bytes
585 * permitted in a DTLS handshake message for |s|. The minimum is 16KB, but may
586 * be greater if the maximum certificate list size requires it. */
587 static unsigned long dtls1_max_handshake_message_len(const SSL
*s
)
589 unsigned long max_len
= DTLS1_HM_HEADER_LENGTH
+ SSL3_RT_MAX_ENCRYPTED_LENGTH
;
590 if (max_len
< (unsigned long)s
->max_cert_list
)
591 return s
->max_cert_list
;
596 dtls1_reassemble_fragment(SSL
*s
, const struct hm_header_st
* msg_hdr
, int *ok
)
598 hm_fragment
*frag
= NULL
;
600 int i
= -1, is_complete
;
602 unsigned long frag_len
= msg_hdr
->frag_len
;
604 if ((msg_hdr
->frag_off
+frag_len
) > msg_hdr
->msg_len
||
605 msg_hdr
->msg_len
> dtls1_max_handshake_message_len(s
))
609 return DTLS1_HM_FRAGMENT_RETRY
;
611 /* Try to find item in queue */
612 pq_64bit_init(&seq64
);
613 pq_64bit_assign_word(&seq64
, msg_hdr
->seq
);
614 item
= pqueue_find(s
->d1
->buffered_messages
, seq64
);
615 pq_64bit_free(&seq64
);
619 frag
= dtls1_hm_fragment_new(msg_hdr
->msg_len
, 1);
622 memcpy(&(frag
->msg_header
), msg_hdr
, sizeof(*msg_hdr
));
623 frag
->msg_header
.frag_len
= frag
->msg_header
.msg_len
;
624 frag
->msg_header
.frag_off
= 0;
628 frag
= (hm_fragment
*) item
->data
;
629 if (frag
->msg_header
.msg_len
!= msg_hdr
->msg_len
)
638 /* If message is already reassembled, this must be a
639 * retransmit and can be dropped. In this case item != NULL and so frag
640 * does not need to be freed.
642 if (frag
->reassembly
== NULL
)
644 unsigned char devnull
[256];
648 i
= s
->method
->ssl_read_bytes(s
,SSL3_RT_HANDSHAKE
,
650 frag_len
>sizeof(devnull
)?sizeof(devnull
):frag_len
,0);
654 return DTLS1_HM_FRAGMENT_RETRY
;
657 /* read the body of the fragment (header has already been read */
658 i
= s
->method
->ssl_read_bytes(s
,SSL3_RT_HANDSHAKE
,
659 frag
->fragment
+ msg_hdr
->frag_off
,frag_len
,0);
660 if ((unsigned long)i
!=frag_len
)
665 RSMBLY_BITMASK_MARK(frag
->reassembly
, (long)msg_hdr
->frag_off
,
666 (long)(msg_hdr
->frag_off
+ frag_len
));
668 RSMBLY_BITMASK_IS_COMPLETE(frag
->reassembly
, (long)msg_hdr
->msg_len
,
673 OPENSSL_free(frag
->reassembly
);
674 frag
->reassembly
= NULL
;
679 pq_64bit_init(&seq64
);
680 pq_64bit_assign_word(&seq64
, msg_hdr
->seq
);
681 item
= pitem_new(seq64
, frag
);
682 pq_64bit_free(&seq64
);
690 item
= pqueue_insert(s
->d1
->buffered_messages
, item
);
691 /* pqueue_insert fails iff a duplicate item is inserted.
692 * However, |item| cannot be a duplicate. If it were,
693 * |pqueue_find|, above, would have returned it and control
694 * would never have reached this branch. */
695 OPENSSL_assert(item
!= NULL
);
698 return DTLS1_HM_FRAGMENT_RETRY
;
701 if (frag
!= NULL
&& item
== NULL
) dtls1_hm_fragment_free(frag
);
708 dtls1_process_out_of_seq_message(SSL
*s
, const struct hm_header_st
* msg_hdr
, int *ok
)
711 hm_fragment
*frag
= NULL
;
714 unsigned long frag_len
= msg_hdr
->frag_len
;
716 if ((msg_hdr
->frag_off
+frag_len
) > msg_hdr
->msg_len
)
719 /* Try to find item in queue, to prevent duplicate entries */
720 pq_64bit_init(&seq64
);
721 pq_64bit_assign_word(&seq64
, msg_hdr
->seq
);
722 item
= pqueue_find(s
->d1
->buffered_messages
, seq64
);
723 pq_64bit_free(&seq64
);
725 /* If we already have an entry and this one is a fragment,
726 * don't discard it and rather try to reassemble it.
728 if (item
!= NULL
&& frag_len
!= msg_hdr
->msg_len
)
731 /* Discard the message if sequence number was already there, is
732 * too far in the future, already in the queue or if we received
733 * a FINISHED before the SERVER_HELLO, which then must be a stale
736 if (msg_hdr
->seq
<= s
->d1
->handshake_read_seq
||
737 msg_hdr
->seq
> s
->d1
->handshake_read_seq
+ 10 || item
!= NULL
||
738 (s
->d1
->handshake_read_seq
== 0 && msg_hdr
->type
== SSL3_MT_FINISHED
))
740 unsigned char devnull
[256];
744 i
= s
->method
->ssl_read_bytes(s
,SSL3_RT_HANDSHAKE
,
746 frag_len
>sizeof(devnull
)?sizeof(devnull
):frag_len
,0);
753 if (frag_len
!= msg_hdr
->msg_len
)
754 return dtls1_reassemble_fragment(s
, msg_hdr
, ok
);
756 if (frag_len
> dtls1_max_handshake_message_len(s
))
759 frag
= dtls1_hm_fragment_new(frag_len
, 0);
763 memcpy(&(frag
->msg_header
), msg_hdr
, sizeof(*msg_hdr
));
767 /* read the body of the fragment (header has already been read) */
768 i
= s
->method
->ssl_read_bytes(s
,SSL3_RT_HANDSHAKE
,
769 frag
->fragment
,frag_len
,0);
770 if ((unsigned long)i
!=frag_len
)
776 pq_64bit_init(&seq64
);
777 pq_64bit_assign_word(&seq64
, msg_hdr
->seq
);
779 item
= pitem_new(seq64
, frag
);
780 pq_64bit_free(&seq64
);
784 item
= pqueue_insert(s
->d1
->buffered_messages
, item
);
785 /* pqueue_insert fails iff a duplicate item is inserted.
786 * However, |item| cannot be a duplicate. If it were,
787 * |pqueue_find|, above, would have returned it. Then, either
788 * |frag_len| != |msg_hdr->msg_len| in which case |item| is set
789 * to NULL and it will have been processed with
790 * |dtls1_reassemble_fragment|, above, or the record will have
792 OPENSSL_assert(item
!= NULL
);
795 return DTLS1_HM_FRAGMENT_RETRY
;
798 if (frag
!= NULL
&& item
== NULL
) dtls1_hm_fragment_free(frag
);
805 dtls1_get_message_fragment(SSL
*s
, int st1
, int stn
, long max
, int *ok
)
807 unsigned char wire
[DTLS1_HM_HEADER_LENGTH
];
808 unsigned long len
, frag_off
, frag_len
;
810 struct hm_header_st msg_hdr
;
813 /* see if we have the required fragment already */
814 if ((frag_len
= dtls1_retrieve_buffered_fragment(s
,max
,ok
)) || *ok
)
816 if (*ok
) s
->init_num
= frag_len
;
820 /* read handshake message header */
821 i
=s
->method
->ssl_read_bytes(s
,SSL3_RT_HANDSHAKE
,wire
,
822 DTLS1_HM_HEADER_LENGTH
, 0);
823 if (i
<= 0) /* nbio, or an error */
825 s
->rwstate
=SSL_READING
;
829 /* Handshake fails if message header is incomplete */
830 if (i
!= DTLS1_HM_HEADER_LENGTH
)
832 al
=SSL_AD_UNEXPECTED_MESSAGE
;
833 SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT
,SSL_R_UNEXPECTED_MESSAGE
);
837 /* parse the message fragment header */
838 dtls1_get_message_header(wire
, &msg_hdr
);
841 * if this is a future (or stale) message it gets buffered
842 * (or dropped)--no further processing at this time
843 * While listening, we accept seq 1 (ClientHello with cookie)
844 * although we're still expecting seq 0 (ClientHello)
846 if (msg_hdr
.seq
!= s
->d1
->handshake_read_seq
&& !(s
->d1
->listen
&& msg_hdr
.seq
== 1))
847 return dtls1_process_out_of_seq_message(s
, &msg_hdr
, ok
);
849 len
= msg_hdr
.msg_len
;
850 frag_off
= msg_hdr
.frag_off
;
851 frag_len
= msg_hdr
.frag_len
;
853 if (frag_len
&& frag_len
< len
)
854 return dtls1_reassemble_fragment(s
, &msg_hdr
, ok
);
856 if (!s
->server
&& s
->d1
->r_msg_hdr
.frag_off
== 0 &&
857 wire
[0] == SSL3_MT_HELLO_REQUEST
)
859 /* The server may always send 'Hello Request' messages --
860 * we are doing a handshake anyway now, so ignore them
861 * if their format is correct. Does not count for
863 if (wire
[1] == 0 && wire
[2] == 0 && wire
[3] == 0)
866 s
->msg_callback(0, s
->version
, SSL3_RT_HANDSHAKE
,
867 wire
, DTLS1_HM_HEADER_LENGTH
, s
,
868 s
->msg_callback_arg
);
873 else /* Incorrectly formated Hello request */
875 al
=SSL_AD_UNEXPECTED_MESSAGE
;
876 SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT
,SSL_R_UNEXPECTED_MESSAGE
);
881 if ((al
=dtls1_preprocess_fragment(s
,&msg_hdr
,max
)))
884 /* XDTLS: ressurect this when restart is in place */
889 unsigned char *p
=(unsigned char *)s
->init_buf
->data
+DTLS1_HM_HEADER_LENGTH
;
891 i
=s
->method
->ssl_read_bytes(s
,SSL3_RT_HANDSHAKE
,
892 &p
[frag_off
],frag_len
,0);
893 /* XDTLS: fix this--message fragments cannot span multiple packets */
896 s
->rwstate
=SSL_READING
;
904 /* XDTLS: an incorrectly formatted fragment should cause the
905 * handshake to fail */
906 if (i
!= (int)frag_len
)
908 al
=SSL3_AD_ILLEGAL_PARAMETER
;
909 SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT
,SSL3_AD_ILLEGAL_PARAMETER
);
915 /* Note that s->init_num is *not* used as current offset in
916 * s->init_buf->data, but as a counter summing up fragments'
917 * lengths: as soon as they sum up to handshake packet
918 * length, we assume we have got all the fragments. */
919 s
->init_num
= frag_len
;
923 ssl3_send_alert(s
,SSL3_AL_FATAL
,al
);
930 int dtls1_send_finished(SSL
*s
, int a
, int b
, const char *sender
, int slen
)
938 d
=(unsigned char *)s
->init_buf
->data
;
939 p
= &(d
[DTLS1_HM_HEADER_LENGTH
]);
941 i
=s
->method
->ssl3_enc
->final_finish_mac(s
,
942 &(s
->s3
->finish_dgst1
),
943 &(s
->s3
->finish_dgst2
),
944 sender
,slen
,s
->s3
->tmp
.finish_md
);
945 s
->s3
->tmp
.finish_md_len
= i
;
946 memcpy(p
, s
->s3
->tmp
.finish_md
, i
);
950 /* Copy the finished so we can use it for
951 * renegotiation checks
953 if(s
->type
== SSL_ST_CONNECT
)
955 OPENSSL_assert(i
<= EVP_MAX_MD_SIZE
);
956 memcpy(s
->s3
->previous_client_finished
,
957 s
->s3
->tmp
.finish_md
, i
);
958 s
->s3
->previous_client_finished_len
=i
;
962 OPENSSL_assert(i
<= EVP_MAX_MD_SIZE
);
963 memcpy(s
->s3
->previous_server_finished
,
964 s
->s3
->tmp
.finish_md
, i
);
965 s
->s3
->previous_server_finished_len
=i
;
968 #ifdef OPENSSL_SYS_WIN16
969 /* MSVC 1.5 does not clear the top bytes of the word unless
975 d
= dtls1_set_message_header(s
, d
, SSL3_MT_FINISHED
, l
, 0, l
);
976 s
->init_num
=(int)l
+DTLS1_HM_HEADER_LENGTH
;
979 /* buffer the message to handle re-xmits */
980 dtls1_buffer_message(s
, 0);
985 /* SSL3_ST_SEND_xxxxxx_HELLO_B */
986 return(dtls1_do_write(s
,SSL3_RT_HANDSHAKE
));
989 /* for these 2 messages, we need to
990 * ssl->enc_read_ctx re-init
991 * ssl->s3->read_sequence zero
992 * ssl->s3->read_mac_secret re-init
993 * ssl->session->read_sym_enc assign
994 * ssl->session->read_compression assign
995 * ssl->session->read_hash assign
997 int dtls1_send_change_cipher_spec(SSL
*s
, int a
, int b
)
1003 p
=(unsigned char *)s
->init_buf
->data
;
1005 s
->d1
->handshake_write_seq
= s
->d1
->next_handshake_write_seq
;
1006 s
->init_num
=DTLS1_CCS_HEADER_LENGTH
;
1008 if (s
->client_version
== DTLS1_BAD_VER
)
1010 s
->d1
->next_handshake_write_seq
++;
1011 s2n(s
->d1
->handshake_write_seq
,p
);
1017 dtls1_set_message_header_int(s
, SSL3_MT_CCS
, 0,
1018 s
->d1
->handshake_write_seq
, 0, 0);
1020 /* buffer the message to handle re-xmits */
1021 dtls1_buffer_message(s
, 1);
1026 /* SSL3_ST_CW_CHANGE_B */
1027 return(dtls1_do_write(s
,SSL3_RT_CHANGE_CIPHER_SPEC
));
1030 static int dtls1_add_cert_to_buf(BUF_MEM
*buf
, unsigned long *l
, X509
*x
)
1036 if (!BUF_MEM_grow_clean(buf
,(int)(n
+(*l
)+3)))
1038 SSLerr(SSL_F_DTLS1_ADD_CERT_TO_BUF
,ERR_R_BUF_LIB
);
1041 p
=(unsigned char *)&(buf
->data
[*l
]);
1048 unsigned long dtls1_output_cert_chain(SSL
*s
, X509
*x
)
1052 unsigned long l
= 3 + DTLS1_HM_HEADER_LENGTH
;
1055 /* TLSv1 sends a chain with nothing in it, instead of an alert */
1057 if (!BUF_MEM_grow_clean(buf
,10))
1059 SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN
,ERR_R_BUF_LIB
);
1064 X509_STORE_CTX xs_ctx
;
1066 if (!X509_STORE_CTX_init(&xs_ctx
,s
->ctx
->cert_store
,x
,NULL
))
1068 SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN
,ERR_R_X509_LIB
);
1072 X509_verify_cert(&xs_ctx
);
1073 /* Don't leave errors in the queue */
1075 for (i
=0; i
< sk_X509_num(xs_ctx
.chain
); i
++)
1077 x
= sk_X509_value(xs_ctx
.chain
, i
);
1079 if (!dtls1_add_cert_to_buf(buf
, &l
, x
))
1081 X509_STORE_CTX_cleanup(&xs_ctx
);
1085 X509_STORE_CTX_cleanup(&xs_ctx
);
1087 /* Thawte special :-) */
1088 for (i
=0; i
<sk_X509_num(s
->ctx
->extra_certs
); i
++)
1090 x
=sk_X509_value(s
->ctx
->extra_certs
,i
);
1091 if (!dtls1_add_cert_to_buf(buf
, &l
, x
))
1095 l
-= (3 + DTLS1_HM_HEADER_LENGTH
);
1097 p
=(unsigned char *)&(buf
->data
[DTLS1_HM_HEADER_LENGTH
]);
1100 p
=(unsigned char *)&(buf
->data
[0]);
1101 p
= dtls1_set_message_header(s
, p
, SSL3_MT_CERTIFICATE
, l
, 0, l
);
1103 l
+=DTLS1_HM_HEADER_LENGTH
;
1107 int dtls1_read_failed(SSL
*s
, int code
)
1111 fprintf( stderr
, "invalid state reached %s:%d", __FILE__
, __LINE__
);
1115 if (!dtls1_is_timer_expired(s
))
1117 /* not a timeout, none of our business,
1118 let higher layers handle this. in fact it's probably an error */
1122 if ( ! SSL_in_init(s
)) /* done, no need to send a retransmit */
1124 BIO_set_flags(SSL_get_rbio(s
), BIO_FLAGS_READ
);
1128 #if 0 /* for now, each alert contains only one record number */
1129 item
= pqueue_peek(state
->rcvd_records
);
1132 /* send an alert immediately for all the missing records */
1137 #if 0 /* no more alert sending, just retransmit the last set of messages */
1138 if ( state
->timeout
.read_timeouts
>= DTLS1_TMO_READ_COUNT
)
1139 ssl3_send_alert(s
,SSL3_AL_WARNING
,
1140 DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
);
1143 return dtls1_handle_timeout(s
);
1147 dtls1_get_queue_priority(unsigned short seq
, int is_ccs
)
1149 /* The index of the retransmission queue actually is the message sequence number,
1150 * since the queue only contains messages of a single handshake. However, the
1151 * ChangeCipherSpec has no message sequence number and so using only the sequence
1152 * will result in the CCS and Finished having the same index. To prevent this,
1153 * the sequence number is multiplied by 2. In case of a CCS 1 is subtracted.
1154 * This does not only differ CSS and Finished, it also maintains the order of the
1155 * index (important for priority queues) and fits in the unsigned short variable.
1157 return seq
* 2 - is_ccs
;
1161 dtls1_retransmit_buffered_messages(SSL
*s
)
1163 pqueue sent
= s
->d1
->sent_messages
;
1169 iter
= pqueue_iterator(sent
);
1171 for ( item
= pqueue_next(&iter
); item
!= NULL
; item
= pqueue_next(&iter
))
1173 frag
= (hm_fragment
*)item
->data
;
1174 if ( dtls1_retransmit_message(s
,
1175 (unsigned short)dtls1_get_queue_priority(frag
->msg_header
.seq
, frag
->msg_header
.is_ccs
),
1176 0, &found
) <= 0 && found
)
1178 fprintf(stderr
, "dtls1_retransmit_message() failed\n");
1187 dtls1_buffer_message(SSL
*s
, int is_ccs
)
1193 /* this function is called immediately after a message has
1194 * been serialized */
1195 OPENSSL_assert(s
->init_off
== 0);
1197 frag
= dtls1_hm_fragment_new(s
->init_num
, 0);
1201 memcpy(frag
->fragment
, s
->init_buf
->data
, s
->init_num
);
1205 OPENSSL_assert(s
->d1
->w_msg_hdr
.msg_len
+
1206 DTLS1_CCS_HEADER_LENGTH
<= (unsigned int)s
->init_num
);
1210 OPENSSL_assert(s
->d1
->w_msg_hdr
.msg_len
+
1211 DTLS1_HM_HEADER_LENGTH
== (unsigned int)s
->init_num
);
1214 frag
->msg_header
.msg_len
= s
->d1
->w_msg_hdr
.msg_len
;
1215 frag
->msg_header
.seq
= s
->d1
->w_msg_hdr
.seq
;
1216 frag
->msg_header
.type
= s
->d1
->w_msg_hdr
.type
;
1217 frag
->msg_header
.frag_off
= 0;
1218 frag
->msg_header
.frag_len
= s
->d1
->w_msg_hdr
.msg_len
;
1219 frag
->msg_header
.is_ccs
= is_ccs
;
1221 /* save current state*/
1222 frag
->msg_header
.saved_retransmit_state
.enc_write_ctx
= s
->enc_write_ctx
;
1223 frag
->msg_header
.saved_retransmit_state
.write_hash
= s
->write_hash
;
1224 frag
->msg_header
.saved_retransmit_state
.compress
= s
->compress
;
1225 frag
->msg_header
.saved_retransmit_state
.session
= s
->session
;
1226 frag
->msg_header
.saved_retransmit_state
.epoch
= s
->d1
->w_epoch
;
1228 pq_64bit_init(&seq64
);
1230 pq_64bit_assign_word(&seq64
,
1231 dtls1_get_queue_priority(frag
->msg_header
.seq
,
1232 frag
->msg_header
.is_ccs
));
1234 item
= pitem_new(seq64
, frag
);
1235 pq_64bit_free(&seq64
);
1238 dtls1_hm_fragment_free(frag
);
1243 fprintf( stderr
, "buffered messge: \ttype = %xx\n", msg_buf
->type
);
1244 fprintf( stderr
, "\t\t\t\t\tlen = %d\n", msg_buf
->len
);
1245 fprintf( stderr
, "\t\t\t\t\tseq_num = %d\n", msg_buf
->seq_num
);
1248 pqueue_insert(s
->d1
->sent_messages
, item
);
1253 dtls1_retransmit_message(SSL
*s
, unsigned short seq
, unsigned long frag_off
,
1257 /* XDTLS: for now assuming that read/writes are blocking */
1260 unsigned long header_length
;
1262 struct dtls1_retransmit_state saved_state
;
1263 unsigned char save_write_sequence
[8];
1266 OPENSSL_assert(s->init_num == 0);
1267 OPENSSL_assert(s->init_off == 0);
1270 /* XDTLS: the requested message ought to be found, otherwise error */
1271 pq_64bit_init(&seq64
);
1272 pq_64bit_assign_word(&seq64
, seq
);
1274 item
= pqueue_find(s
->d1
->sent_messages
, seq64
);
1275 pq_64bit_free(&seq64
);
1278 fprintf(stderr
, "retransmit: message %d non-existant\n", seq
);
1284 frag
= (hm_fragment
*)item
->data
;
1286 if ( frag
->msg_header
.is_ccs
)
1287 header_length
= DTLS1_CCS_HEADER_LENGTH
;
1289 header_length
= DTLS1_HM_HEADER_LENGTH
;
1291 memcpy(s
->init_buf
->data
, frag
->fragment
,
1292 frag
->msg_header
.msg_len
+ header_length
);
1293 s
->init_num
= frag
->msg_header
.msg_len
+ header_length
;
1295 dtls1_set_message_header_int(s
, frag
->msg_header
.type
,
1296 frag
->msg_header
.msg_len
, frag
->msg_header
.seq
, 0,
1297 frag
->msg_header
.frag_len
);
1299 /* save current state */
1300 saved_state
.enc_write_ctx
= s
->enc_write_ctx
;
1301 saved_state
.write_hash
= s
->write_hash
;
1302 saved_state
.compress
= s
->compress
;
1303 saved_state
.session
= s
->session
;
1304 saved_state
.epoch
= s
->d1
->w_epoch
;
1305 saved_state
.epoch
= s
->d1
->w_epoch
;
1307 s
->d1
->retransmitting
= 1;
1309 /* restore state in which the message was originally sent */
1310 s
->enc_write_ctx
= frag
->msg_header
.saved_retransmit_state
.enc_write_ctx
;
1311 s
->write_hash
= frag
->msg_header
.saved_retransmit_state
.write_hash
;
1312 s
->compress
= frag
->msg_header
.saved_retransmit_state
.compress
;
1313 s
->session
= frag
->msg_header
.saved_retransmit_state
.session
;
1314 s
->d1
->w_epoch
= frag
->msg_header
.saved_retransmit_state
.epoch
;
1316 if (frag
->msg_header
.saved_retransmit_state
.epoch
== saved_state
.epoch
- 1)
1318 memcpy(save_write_sequence
, s
->s3
->write_sequence
, sizeof(s
->s3
->write_sequence
));
1319 memcpy(s
->s3
->write_sequence
, s
->d1
->last_write_sequence
, sizeof(s
->s3
->write_sequence
));
1322 ret
= dtls1_do_write(s
, frag
->msg_header
.is_ccs
?
1323 SSL3_RT_CHANGE_CIPHER_SPEC
: SSL3_RT_HANDSHAKE
);
1325 /* restore current state */
1326 s
->enc_write_ctx
= saved_state
.enc_write_ctx
;
1327 s
->write_hash
= saved_state
.write_hash
;
1328 s
->compress
= saved_state
.compress
;
1329 s
->session
= saved_state
.session
;
1330 s
->d1
->w_epoch
= saved_state
.epoch
;
1332 if (frag
->msg_header
.saved_retransmit_state
.epoch
== saved_state
.epoch
- 1)
1334 memcpy(s
->d1
->last_write_sequence
, s
->s3
->write_sequence
, sizeof(s
->s3
->write_sequence
));
1335 memcpy(s
->s3
->write_sequence
, save_write_sequence
, sizeof(s
->s3
->write_sequence
));
1338 s
->d1
->retransmitting
= 0;
1340 (void)BIO_flush(SSL_get_wbio(s
));
1344 /* call this function when the buffered messages are no longer needed */
1346 dtls1_clear_record_buffer(SSL
*s
)
1350 for(item
= pqueue_pop(s
->d1
->sent_messages
);
1351 item
!= NULL
; item
= pqueue_pop(s
->d1
->sent_messages
))
1353 dtls1_hm_fragment_free((hm_fragment
*)item
->data
);
1360 dtls1_set_message_header(SSL
*s
, unsigned char *p
, unsigned char mt
,
1361 unsigned long len
, unsigned long frag_off
, unsigned long frag_len
)
1363 /* Don't change sequence numbers while listening */
1364 if (frag_off
== 0 && !s
->d1
->listen
)
1366 s
->d1
->handshake_write_seq
= s
->d1
->next_handshake_write_seq
;
1367 s
->d1
->next_handshake_write_seq
++;
1370 dtls1_set_message_header_int(s
, mt
, len
, s
->d1
->handshake_write_seq
,
1371 frag_off
, frag_len
);
1373 return p
+= DTLS1_HM_HEADER_LENGTH
;
1377 /* don't actually do the writing, wait till the MTU has been retrieved */
1379 dtls1_set_message_header_int(SSL
*s
, unsigned char mt
,
1380 unsigned long len
, unsigned short seq_num
, unsigned long frag_off
,
1381 unsigned long frag_len
)
1383 struct hm_header_st
*msg_hdr
= &s
->d1
->w_msg_hdr
;
1386 msg_hdr
->msg_len
= len
;
1387 msg_hdr
->seq
= seq_num
;
1388 msg_hdr
->frag_off
= frag_off
;
1389 msg_hdr
->frag_len
= frag_len
;
1393 dtls1_fix_message_header(SSL
*s
, unsigned long frag_off
,
1394 unsigned long frag_len
)
1396 struct hm_header_st
*msg_hdr
= &s
->d1
->w_msg_hdr
;
1398 msg_hdr
->frag_off
= frag_off
;
1399 msg_hdr
->frag_len
= frag_len
;
1402 static unsigned char *
1403 dtls1_write_message_header(SSL
*s
, unsigned char *p
)
1405 struct hm_header_st
*msg_hdr
= &s
->d1
->w_msg_hdr
;
1407 *p
++ = msg_hdr
->type
;
1408 l2n3(msg_hdr
->msg_len
, p
);
1410 s2n(msg_hdr
->seq
, p
);
1411 l2n3(msg_hdr
->frag_off
, p
);
1412 l2n3(msg_hdr
->frag_len
, p
);
1420 return (g_probable_mtu
[(sizeof(g_probable_mtu
) /
1421 sizeof(g_probable_mtu
[0])) - 1]);
1425 dtls1_guess_mtu(unsigned int curr_mtu
)
1429 if ( curr_mtu
== 0 )
1430 return g_probable_mtu
[0] ;
1432 for ( i
= 0; i
< sizeof(g_probable_mtu
)/sizeof(g_probable_mtu
[0]); i
++)
1433 if ( curr_mtu
> g_probable_mtu
[i
])
1434 return g_probable_mtu
[i
];
1440 dtls1_get_message_header(unsigned char *data
, struct hm_header_st
*msg_hdr
)
1442 memset(msg_hdr
, 0x00, sizeof(struct hm_header_st
));
1443 msg_hdr
->type
= *(data
++);
1444 n2l3(data
, msg_hdr
->msg_len
);
1446 n2s(data
, msg_hdr
->seq
);
1447 n2l3(data
, msg_hdr
->frag_off
);
1448 n2l3(data
, msg_hdr
->frag_len
);
1452 dtls1_get_ccs_header(unsigned char *data
, struct ccs_header_st
*ccs_hdr
)
1454 memset(ccs_hdr
, 0x00, sizeof(struct ccs_header_st
));
1456 ccs_hdr
->type
= *(data
++);