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
[] = {0x00, 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_min_mtu(void);
162 static unsigned int dtls1_guess_mtu(unsigned int curr_mtu
);
163 static void dtls1_fix_message_header(SSL
*s
, unsigned long frag_off
,
164 unsigned long frag_len
);
165 static unsigned char *dtls1_write_message_header(SSL
*s
,
167 static void dtls1_set_message_header_int(SSL
*s
, unsigned char mt
,
168 unsigned long len
, unsigned short seq_num
, unsigned long frag_off
,
169 unsigned long frag_len
);
170 static long dtls1_get_message_fragment(SSL
*s
, int st1
, int stn
,
174 dtls1_hm_fragment_new(unsigned long frag_len
, int reassembly
)
176 hm_fragment
*frag
= NULL
;
177 unsigned char *buf
= NULL
;
178 unsigned char *bitmask
= NULL
;
180 frag
= (hm_fragment
*)OPENSSL_malloc(sizeof(hm_fragment
));
186 buf
= (unsigned char *)OPENSSL_malloc(frag_len
);
194 /* zero length fragment gets zero frag->fragment */
195 frag
->fragment
= buf
;
197 /* Initialize reassembly bitmask if necessary */
200 bitmask
= (unsigned char *)OPENSSL_malloc(RSMBLY_BITMASK_SIZE(frag_len
));
203 if (buf
!= NULL
) OPENSSL_free(buf
);
207 memset(bitmask
, 0, RSMBLY_BITMASK_SIZE(frag_len
));
210 frag
->reassembly
= bitmask
;
216 dtls1_hm_fragment_free(hm_fragment
*frag
)
218 if (frag
->fragment
) OPENSSL_free(frag
->fragment
);
219 if (frag
->reassembly
) OPENSSL_free(frag
->reassembly
);
223 /* send s->init_buf in records of type 'type' (SSL3_RT_HANDSHAKE or SSL3_RT_CHANGE_CIPHER_SPEC) */
224 int dtls1_do_write(SSL
*s
, int type
)
228 unsigned int len
, frag_off
, mac_size
, blocksize
;
230 /* AHA! Figure out the MTU, and stick to the right size */
231 if ( ! (SSL_get_options(s
) & SSL_OP_NO_QUERY_MTU
))
234 BIO_ctrl(SSL_get_wbio(s
), BIO_CTRL_DGRAM_QUERY_MTU
, 0, NULL
);
236 /* I've seen the kernel return bogus numbers when it doesn't know
237 * (initial write), so just make sure we have a reasonable number */
238 if ( s
->d1
->mtu
< dtls1_min_mtu())
241 s
->d1
->mtu
= dtls1_guess_mtu(s
->d1
->mtu
);
242 BIO_ctrl(SSL_get_wbio(s
), BIO_CTRL_DGRAM_SET_MTU
,
249 fprintf(stderr
, "using MTU = %d\n", mtu
);
251 mtu
-= (DTLS1_HM_HEADER_LENGTH
+ DTLS1_RT_HEADER_LENGTH
);
253 curr_mtu
= mtu
- BIO_wpending(SSL_get_wbio(s
));
257 else if ( ( ret
= BIO_flush(SSL_get_wbio(s
))) <= 0)
260 if ( BIO_wpending(SSL_get_wbio(s
)) + s
->init_num
>= mtu
)
262 ret
= BIO_flush(SSL_get_wbio(s
));
265 mtu
= s
->d1
->mtu
- (DTLS1_HM_HEADER_LENGTH
+ DTLS1_RT_HEADER_LENGTH
);
268 OPENSSL_assert(mtu
> 0); /* should have something reasonable now */
272 if ( s
->init_off
== 0 && type
== SSL3_RT_HANDSHAKE
)
273 OPENSSL_assert(s
->init_num
==
274 (int)s
->d1
->w_msg_hdr
.msg_len
+ DTLS1_HM_HEADER_LENGTH
);
277 mac_size
= EVP_MD_CTX_size(s
->write_hash
);
281 if (s
->enc_write_ctx
&&
282 (EVP_CIPHER_mode( s
->enc_write_ctx
->cipher
) & EVP_CIPH_CBC_MODE
))
283 blocksize
= 2 * EVP_CIPHER_block_size(s
->enc_write_ctx
->cipher
);
290 curr_mtu
= s
->d1
->mtu
- BIO_wpending(SSL_get_wbio(s
)) -
291 DTLS1_RT_HEADER_LENGTH
- mac_size
- blocksize
;
293 if ( curr_mtu
<= DTLS1_HM_HEADER_LENGTH
)
295 /* grr.. we could get an error if MTU picked was wrong */
296 ret
= BIO_flush(SSL_get_wbio(s
));
299 curr_mtu
= s
->d1
->mtu
- DTLS1_RT_HEADER_LENGTH
-
300 mac_size
- blocksize
;
303 if ( s
->init_num
> curr_mtu
)
309 /* XDTLS: this function is too long. split out the CCS part */
310 if ( type
== SSL3_RT_HANDSHAKE
)
312 if ( s
->init_off
!= 0)
314 OPENSSL_assert(s
->init_off
> DTLS1_HM_HEADER_LENGTH
);
315 s
->init_off
-= DTLS1_HM_HEADER_LENGTH
;
316 s
->init_num
+= DTLS1_HM_HEADER_LENGTH
;
318 /* write atleast DTLS1_HM_HEADER_LENGTH bytes */
319 if ( len
<= DTLS1_HM_HEADER_LENGTH
)
320 len
+= DTLS1_HM_HEADER_LENGTH
;
323 dtls1_fix_message_header(s
, frag_off
,
324 len
- DTLS1_HM_HEADER_LENGTH
);
326 dtls1_write_message_header(s
, (unsigned char *)&s
->init_buf
->data
[s
->init_off
]);
328 OPENSSL_assert(len
>= DTLS1_HM_HEADER_LENGTH
);
331 ret
=dtls1_write_bytes(s
,type
,&s
->init_buf
->data
[s
->init_off
],
335 /* might need to update MTU here, but we don't know
336 * which previous packet caused the failure -- so can't
337 * really retransmit anything. continue as if everything
338 * is fine and wait for an alert to handle the
341 if ( BIO_ctrl(SSL_get_wbio(s
),
342 BIO_CTRL_DGRAM_MTU_EXCEEDED
, 0, NULL
) > 0 )
343 s
->d1
->mtu
= BIO_ctrl(SSL_get_wbio(s
),
344 BIO_CTRL_DGRAM_QUERY_MTU
, 0, NULL
);
351 /* bad if this assert fails, only part of the handshake
352 * message got sent. but why would this happen? */
353 OPENSSL_assert(len
== (unsigned int)ret
);
355 if (type
== SSL3_RT_HANDSHAKE
&& ! s
->d1
->retransmitting
)
357 /* should not be done for 'Hello Request's, but in that case
358 * we'll ignore the result anyway */
359 unsigned char *p
= (unsigned char *)&s
->init_buf
->data
[s
->init_off
];
360 const struct hm_header_st
*msg_hdr
= &s
->d1
->w_msg_hdr
;
363 if (frag_off
== 0 && s
->version
!= DTLS1_BAD_VER
)
365 /* reconstruct message header is if it
366 * is being sent in single fragment */
367 *p
++ = msg_hdr
->type
;
368 l2n3(msg_hdr
->msg_len
,p
);
369 s2n (msg_hdr
->seq
,p
);
371 l2n3(msg_hdr
->msg_len
,p
);
372 p
-= DTLS1_HM_HEADER_LENGTH
;
377 p
+= DTLS1_HM_HEADER_LENGTH
;
378 xlen
= ret
- DTLS1_HM_HEADER_LENGTH
;
381 ssl3_finish_mac(s
, p
, xlen
);
384 if (ret
== s
->init_num
)
387 s
->msg_callback(1, s
->version
, type
, s
->init_buf
->data
,
388 (size_t)(s
->init_off
+ s
->init_num
), s
,
389 s
->msg_callback_arg
);
391 s
->init_off
= 0; /* done writing this message */
398 frag_off
+= (ret
-= DTLS1_HM_HEADER_LENGTH
);
405 /* Obtain handshake message of message type 'mt' (any if mt == -1),
406 * maximum acceptable body length 'max'.
407 * Read an entire handshake message. Handshake messages arrive in
410 long dtls1_get_message(SSL
*s
, int st1
, int stn
, int mt
, long max
, int *ok
)
413 struct hm_header_st
*msg_hdr
;
415 unsigned long msg_len
;
417 /* s3->tmp is used to store messages that are unexpected, caused
418 * by the absence of an optional handshake message */
419 if (s
->s3
->tmp
.reuse_message
)
421 s
->s3
->tmp
.reuse_message
=0;
422 if ((mt
>= 0) && (s
->s3
->tmp
.message_type
!= mt
))
424 al
=SSL_AD_UNEXPECTED_MESSAGE
;
425 SSLerr(SSL_F_DTLS1_GET_MESSAGE
,SSL_R_UNEXPECTED_MESSAGE
);
429 s
->init_msg
= s
->init_buf
->data
+ DTLS1_HM_HEADER_LENGTH
;
430 s
->init_num
= (int)s
->s3
->tmp
.message_size
;
434 msg_hdr
= &s
->d1
->r_msg_hdr
;
435 memset(msg_hdr
, 0x00, sizeof(struct hm_header_st
));
438 i
= dtls1_get_message_fragment(s
, st1
, stn
, max
, ok
);
439 if ( i
== DTLS1_HM_BAD_FRAGMENT
||
440 i
== DTLS1_HM_FRAGMENT_RETRY
) /* bad fragment received */
442 else if ( i
<= 0 && !*ok
)
445 p
= (unsigned char *)s
->init_buf
->data
;
446 msg_len
= msg_hdr
->msg_len
;
448 /* reconstruct message header */
449 *(p
++) = msg_hdr
->type
;
451 s2n (msg_hdr
->seq
,p
);
454 if (s
->version
!= DTLS1_BAD_VER
) {
455 p
-= DTLS1_HM_HEADER_LENGTH
;
456 msg_len
+= DTLS1_HM_HEADER_LENGTH
;
459 ssl3_finish_mac(s
, p
, msg_len
);
461 s
->msg_callback(0, s
->version
, SSL3_RT_HANDSHAKE
,
463 s
, s
->msg_callback_arg
);
465 memset(msg_hdr
, 0x00, sizeof(struct hm_header_st
));
467 s
->d1
->handshake_read_seq
++;
468 /* we just read a handshake message from the other side:
469 * this means that we don't need to retransmit of the
471 * XDTLS: may be able clear out this
472 * buffer a little sooner (i.e if an out-of-order
473 * handshake message/record is received at the record
475 * XDTLS: exception is that the server needs to
476 * know that change cipher spec and finished messages
477 * have been received by the client before clearing this
478 * buffer. this can simply be done by waiting for the
479 * first data segment, but is there a better way? */
480 dtls1_clear_record_buffer(s
);
482 s
->init_msg
= s
->init_buf
->data
+ DTLS1_HM_HEADER_LENGTH
;
486 ssl3_send_alert(s
,SSL3_AL_FATAL
,al
);
492 static int dtls1_preprocess_fragment(SSL
*s
,struct hm_header_st
*msg_hdr
,int max
)
494 size_t frag_off
,frag_len
,msg_len
;
496 msg_len
= msg_hdr
->msg_len
;
497 frag_off
= msg_hdr
->frag_off
;
498 frag_len
= msg_hdr
->frag_len
;
500 /* sanity checking */
501 if ( (frag_off
+frag_len
) > msg_len
)
503 SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT
,SSL_R_EXCESSIVE_MESSAGE_SIZE
);
504 return SSL_AD_ILLEGAL_PARAMETER
;
507 if ( (frag_off
+frag_len
) > (unsigned long)max
)
509 SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT
,SSL_R_EXCESSIVE_MESSAGE_SIZE
);
510 return SSL_AD_ILLEGAL_PARAMETER
;
513 if ( s
->d1
->r_msg_hdr
.frag_off
== 0) /* first fragment */
515 /* msg_len is limited to 2^24, but is effectively checked
516 * against max above */
517 if (!BUF_MEM_grow_clean(s
->init_buf
,msg_len
+DTLS1_HM_HEADER_LENGTH
))
519 SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT
,ERR_R_BUF_LIB
);
520 return SSL_AD_INTERNAL_ERROR
;
523 s
->s3
->tmp
.message_size
= msg_len
;
524 s
->d1
->r_msg_hdr
.msg_len
= msg_len
;
525 s
->s3
->tmp
.message_type
= msg_hdr
->type
;
526 s
->d1
->r_msg_hdr
.type
= msg_hdr
->type
;
527 s
->d1
->r_msg_hdr
.seq
= msg_hdr
->seq
;
529 else if (msg_len
!= s
->d1
->r_msg_hdr
.msg_len
)
531 /* They must be playing with us! BTW, failure to enforce
532 * upper limit would open possibility for buffer overrun. */
533 SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT
,SSL_R_EXCESSIVE_MESSAGE_SIZE
);
534 return SSL_AD_ILLEGAL_PARAMETER
;
537 return 0; /* no error */
542 dtls1_retrieve_buffered_fragment(SSL
*s
, long max
, int *ok
)
544 /* (0) check whether the desired fragment is available
546 * (1) copy over the fragment to s->init_buf->data[]
547 * (2) update s->init_num
554 item
= pqueue_peek(s
->d1
->buffered_messages
);
558 frag
= (hm_fragment
*)item
->data
;
560 /* Don't return if reassembly still in progress */
561 if (frag
->reassembly
!= NULL
)
564 if ( s
->d1
->handshake_read_seq
== frag
->msg_header
.seq
)
566 unsigned long frag_len
= frag
->msg_header
.frag_len
;
567 pqueue_pop(s
->d1
->buffered_messages
);
569 al
=dtls1_preprocess_fragment(s
,&frag
->msg_header
,max
);
571 if (al
==0) /* no alert */
573 unsigned char *p
= (unsigned char *)s
->init_buf
->data
+DTLS1_HM_HEADER_LENGTH
;
574 memcpy(&p
[frag
->msg_header
.frag_off
],
575 frag
->fragment
,frag
->msg_header
.frag_len
);
578 dtls1_hm_fragment_free(frag
);
587 ssl3_send_alert(s
,SSL3_AL_FATAL
,al
);
598 dtls1_reassemble_fragment(SSL
*s
, struct hm_header_st
* msg_hdr
, int *ok
)
600 hm_fragment
*frag
= NULL
;
602 int i
= -1, is_complete
;
603 unsigned char seq64be
[8];
604 unsigned long frag_len
= msg_hdr
->frag_len
, max_len
;
606 if ((msg_hdr
->frag_off
+frag_len
) > msg_hdr
->msg_len
)
609 /* Determine maximum allowed message size. Depends on (user set)
610 * maximum certificate length, but 16k is minimum.
612 if (DTLS1_HM_HEADER_LENGTH
+ SSL3_RT_MAX_ENCRYPTED_LENGTH
< s
->max_cert_list
)
613 max_len
= s
->max_cert_list
;
615 max_len
= DTLS1_HM_HEADER_LENGTH
+ SSL3_RT_MAX_ENCRYPTED_LENGTH
;
617 if ((msg_hdr
->frag_off
+frag_len
) > max_len
)
620 /* Try to find item in queue */
621 memset(seq64be
,0,sizeof(seq64be
));
622 seq64be
[6] = (unsigned char) (msg_hdr
->seq
>>8);
623 seq64be
[7] = (unsigned char) msg_hdr
->seq
;
624 item
= pqueue_find(s
->d1
->buffered_messages
, seq64be
);
628 frag
= dtls1_hm_fragment_new(msg_hdr
->msg_len
, 1);
631 memcpy(&(frag
->msg_header
), msg_hdr
, sizeof(*msg_hdr
));
632 frag
->msg_header
.frag_len
= frag
->msg_header
.msg_len
;
633 frag
->msg_header
.frag_off
= 0;
636 frag
= (hm_fragment
*) item
->data
;
638 /* If message is already reassembled, this must be a
639 * retransmit and can be dropped.
641 if (frag
->reassembly
== NULL
)
643 unsigned char devnull
[256];
647 i
= s
->method
->ssl_read_bytes(s
,SSL3_RT_HANDSHAKE
,
649 frag_len
>sizeof(devnull
)?sizeof(devnull
):frag_len
,0);
653 return DTLS1_HM_FRAGMENT_RETRY
;
656 /* read the body of the fragment (header has already been read */
657 i
= s
->method
->ssl_read_bytes(s
,SSL3_RT_HANDSHAKE
,
658 frag
->fragment
+ msg_hdr
->frag_off
,frag_len
,0);
659 if (i
<=0 || (unsigned long)i
!=frag_len
)
662 RSMBLY_BITMASK_MARK(frag
->reassembly
, (long)msg_hdr
->frag_off
,
663 (long)(msg_hdr
->frag_off
+ frag_len
));
665 RSMBLY_BITMASK_IS_COMPLETE(frag
->reassembly
, (long)msg_hdr
->msg_len
,
670 OPENSSL_free(frag
->reassembly
);
671 frag
->reassembly
= NULL
;
676 memset(seq64be
,0,sizeof(seq64be
));
677 seq64be
[6] = (unsigned char)(msg_hdr
->seq
>>8);
678 seq64be
[7] = (unsigned char)(msg_hdr
->seq
);
680 item
= pitem_new(seq64be
, frag
);
687 pqueue_insert(s
->d1
->buffered_messages
, item
);
690 return DTLS1_HM_FRAGMENT_RETRY
;
693 if (frag
!= NULL
) dtls1_hm_fragment_free(frag
);
694 if (item
!= NULL
) OPENSSL_free(item
);
701 dtls1_process_out_of_seq_message(SSL
*s
, struct hm_header_st
* msg_hdr
, int *ok
)
704 hm_fragment
*frag
= NULL
;
706 unsigned char seq64be
[8];
707 unsigned long frag_len
= msg_hdr
->frag_len
;
709 if ((msg_hdr
->frag_off
+frag_len
) > msg_hdr
->msg_len
)
712 /* Try to find item in queue, to prevent duplicate entries */
713 memset(seq64be
,0,sizeof(seq64be
));
714 seq64be
[6] = (unsigned char) (msg_hdr
->seq
>>8);
715 seq64be
[7] = (unsigned char) msg_hdr
->seq
;
716 item
= pqueue_find(s
->d1
->buffered_messages
, seq64be
);
718 /* If we already have an entry and this one is a fragment,
719 * don't discard it and rather try to reassemble it.
721 if (item
!= NULL
&& frag_len
< msg_hdr
->msg_len
)
724 /* Discard the message if sequence number was already there, is
725 * too far in the future, already in the queue or if we received
726 * a FINISHED before the SERVER_HELLO, which then must be a stale
729 if (msg_hdr
->seq
<= s
->d1
->handshake_read_seq
||
730 msg_hdr
->seq
> s
->d1
->handshake_read_seq
+ 10 || item
!= NULL
||
731 (s
->d1
->handshake_read_seq
== 0 && msg_hdr
->type
== SSL3_MT_FINISHED
))
733 unsigned char devnull
[256];
737 i
= s
->method
->ssl_read_bytes(s
,SSL3_RT_HANDSHAKE
,
739 frag_len
>sizeof(devnull
)?sizeof(devnull
):frag_len
,0);
746 if (frag_len
&& frag_len
< msg_hdr
->msg_len
)
747 return dtls1_reassemble_fragment(s
, msg_hdr
, ok
);
749 frag
= dtls1_hm_fragment_new(frag_len
, 0);
753 memcpy(&(frag
->msg_header
), msg_hdr
, sizeof(*msg_hdr
));
757 /* read the body of the fragment (header has already been read */
758 i
= s
->method
->ssl_read_bytes(s
,SSL3_RT_HANDSHAKE
,
759 frag
->fragment
,frag_len
,0);
760 if (i
<=0 || (unsigned long)i
!=frag_len
)
764 memset(seq64be
,0,sizeof(seq64be
));
765 seq64be
[6] = (unsigned char)(msg_hdr
->seq
>>8);
766 seq64be
[7] = (unsigned char)(msg_hdr
->seq
);
768 item
= pitem_new(seq64be
, frag
);
772 pqueue_insert(s
->d1
->buffered_messages
, item
);
775 return DTLS1_HM_FRAGMENT_RETRY
;
778 if ( frag
!= NULL
) dtls1_hm_fragment_free(frag
);
779 if ( item
!= NULL
) OPENSSL_free(item
);
786 dtls1_get_message_fragment(SSL
*s
, int st1
, int stn
, long max
, int *ok
)
788 unsigned char wire
[DTLS1_HM_HEADER_LENGTH
];
789 unsigned long len
, frag_off
, frag_len
;
791 struct hm_header_st msg_hdr
;
793 /* see if we have the required fragment already */
794 if ((frag_len
= dtls1_retrieve_buffered_fragment(s
,max
,ok
)) || *ok
)
796 if (*ok
) s
->init_num
= frag_len
;
800 /* read handshake message header */
801 i
=s
->method
->ssl_read_bytes(s
,SSL3_RT_HANDSHAKE
,wire
,
802 DTLS1_HM_HEADER_LENGTH
, 0);
803 if (i
<= 0) /* nbio, or an error */
805 s
->rwstate
=SSL_READING
;
809 OPENSSL_assert(i
== DTLS1_HM_HEADER_LENGTH
);
811 /* parse the message fragment header */
812 dtls1_get_message_header(wire
, &msg_hdr
);
815 * if this is a future (or stale) message it gets buffered
816 * (or dropped)--no further processing at this time
818 if ( msg_hdr
.seq
!= s
->d1
->handshake_read_seq
)
819 return dtls1_process_out_of_seq_message(s
, &msg_hdr
, ok
);
821 len
= msg_hdr
.msg_len
;
822 frag_off
= msg_hdr
.frag_off
;
823 frag_len
= msg_hdr
.frag_len
;
825 if (frag_len
&& frag_len
< len
)
826 return dtls1_reassemble_fragment(s
, &msg_hdr
, ok
);
828 if (!s
->server
&& s
->d1
->r_msg_hdr
.frag_off
== 0 &&
829 wire
[0] == SSL3_MT_HELLO_REQUEST
)
831 /* The server may always send 'Hello Request' messages --
832 * we are doing a handshake anyway now, so ignore them
833 * if their format is correct. Does not count for
835 if (wire
[1] == 0 && wire
[2] == 0 && wire
[3] == 0)
838 s
->msg_callback(0, s
->version
, SSL3_RT_HANDSHAKE
,
839 wire
, DTLS1_HM_HEADER_LENGTH
, s
,
840 s
->msg_callback_arg
);
843 return dtls1_get_message_fragment(s
, st1
, stn
,
846 else /* Incorrectly formated Hello request */
848 al
=SSL_AD_UNEXPECTED_MESSAGE
;
849 SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT
,SSL_R_UNEXPECTED_MESSAGE
);
854 if ((al
=dtls1_preprocess_fragment(s
,&msg_hdr
,max
)))
857 /* XDTLS: ressurect this when restart is in place */
862 unsigned char *p
=(unsigned char *)s
->init_buf
->data
+DTLS1_HM_HEADER_LENGTH
;
864 i
=s
->method
->ssl_read_bytes(s
,SSL3_RT_HANDSHAKE
,
865 &p
[frag_off
],frag_len
,0);
866 /* XDTLS: fix this--message fragments cannot span multiple packets */
869 s
->rwstate
=SSL_READING
;
877 /* XDTLS: an incorrectly formatted fragment should cause the
878 * handshake to fail */
879 OPENSSL_assert(i
== (int)frag_len
);
883 /* Note that s->init_num is *not* used as current offset in
884 * s->init_buf->data, but as a counter summing up fragments'
885 * lengths: as soon as they sum up to handshake packet
886 * length, we assume we have got all the fragments. */
887 s
->init_num
= frag_len
;
891 ssl3_send_alert(s
,SSL3_AL_FATAL
,al
);
898 int dtls1_send_finished(SSL
*s
, int a
, int b
, const char *sender
, int slen
)
906 d
=(unsigned char *)s
->init_buf
->data
;
907 p
= &(d
[DTLS1_HM_HEADER_LENGTH
]);
909 i
=s
->method
->ssl3_enc
->final_finish_mac(s
,
910 sender
,slen
,s
->s3
->tmp
.finish_md
);
911 s
->s3
->tmp
.finish_md_len
= i
;
912 memcpy(p
, s
->s3
->tmp
.finish_md
, i
);
916 /* Copy the finished so we can use it for
917 * renegotiation checks
919 if(s
->type
== SSL_ST_CONNECT
)
921 OPENSSL_assert(i
<= EVP_MAX_MD_SIZE
);
922 memcpy(s
->s3
->previous_client_finished
,
923 s
->s3
->tmp
.finish_md
, i
);
924 s
->s3
->previous_client_finished_len
=i
;
928 OPENSSL_assert(i
<= EVP_MAX_MD_SIZE
);
929 memcpy(s
->s3
->previous_server_finished
,
930 s
->s3
->tmp
.finish_md
, i
);
931 s
->s3
->previous_server_finished_len
=i
;
934 #ifdef OPENSSL_SYS_WIN16
935 /* MSVC 1.5 does not clear the top bytes of the word unless
941 d
= dtls1_set_message_header(s
, d
, SSL3_MT_FINISHED
, l
, 0, l
);
942 s
->init_num
=(int)l
+DTLS1_HM_HEADER_LENGTH
;
945 /* buffer the message to handle re-xmits */
946 dtls1_buffer_message(s
, 0);
951 /* SSL3_ST_SEND_xxxxxx_HELLO_B */
952 return(dtls1_do_write(s
,SSL3_RT_HANDSHAKE
));
955 /* for these 2 messages, we need to
956 * ssl->enc_read_ctx re-init
957 * ssl->s3->read_sequence zero
958 * ssl->s3->read_mac_secret re-init
959 * ssl->session->read_sym_enc assign
960 * ssl->session->read_compression assign
961 * ssl->session->read_hash assign
963 int dtls1_send_change_cipher_spec(SSL
*s
, int a
, int b
)
969 p
=(unsigned char *)s
->init_buf
->data
;
971 s
->d1
->handshake_write_seq
= s
->d1
->next_handshake_write_seq
;
972 s
->init_num
=DTLS1_CCS_HEADER_LENGTH
;
974 if (s
->version
== DTLS1_BAD_VER
) {
975 s
->d1
->next_handshake_write_seq
++;
976 s2n(s
->d1
->handshake_write_seq
,p
);
982 dtls1_set_message_header_int(s
, SSL3_MT_CCS
, 0,
983 s
->d1
->handshake_write_seq
, 0, 0);
985 /* buffer the message to handle re-xmits */
986 dtls1_buffer_message(s
, 1);
991 /* SSL3_ST_CW_CHANGE_B */
992 return(dtls1_do_write(s
,SSL3_RT_CHANGE_CIPHER_SPEC
));
995 static int dtls1_add_cert_to_buf(BUF_MEM
*buf
, unsigned long *l
, X509
*x
)
1001 if (!BUF_MEM_grow_clean(buf
,(int)(n
+(*l
)+3)))
1003 SSLerr(SSL_F_DTLS1_ADD_CERT_TO_BUF
,ERR_R_BUF_LIB
);
1006 p
=(unsigned char *)&(buf
->data
[*l
]);
1013 unsigned long dtls1_output_cert_chain(SSL
*s
, X509
*x
)
1017 unsigned long l
= 3 + DTLS1_HM_HEADER_LENGTH
;
1020 /* TLSv1 sends a chain with nothing in it, instead of an alert */
1022 if (!BUF_MEM_grow_clean(buf
,10))
1024 SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN
,ERR_R_BUF_LIB
);
1029 X509_STORE_CTX xs_ctx
;
1031 if (!X509_STORE_CTX_init(&xs_ctx
,s
->ctx
->cert_store
,x
,NULL
))
1033 SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN
,ERR_R_X509_LIB
);
1037 X509_verify_cert(&xs_ctx
);
1038 /* Don't leave errors in the queue */
1040 for (i
=0; i
< sk_X509_num(xs_ctx
.chain
); i
++)
1042 x
= sk_X509_value(xs_ctx
.chain
, i
);
1044 if (!dtls1_add_cert_to_buf(buf
, &l
, x
))
1046 X509_STORE_CTX_cleanup(&xs_ctx
);
1050 X509_STORE_CTX_cleanup(&xs_ctx
);
1052 /* Thawte special :-) */
1053 for (i
=0; i
<sk_X509_num(s
->ctx
->extra_certs
); i
++)
1055 x
=sk_X509_value(s
->ctx
->extra_certs
,i
);
1056 if (!dtls1_add_cert_to_buf(buf
, &l
, x
))
1060 l
-= (3 + DTLS1_HM_HEADER_LENGTH
);
1062 p
=(unsigned char *)&(buf
->data
[DTLS1_HM_HEADER_LENGTH
]);
1065 p
=(unsigned char *)&(buf
->data
[0]);
1066 p
= dtls1_set_message_header(s
, p
, SSL3_MT_CERTIFICATE
, l
, 0, l
);
1068 l
+=DTLS1_HM_HEADER_LENGTH
;
1072 int dtls1_read_failed(SSL
*s
, int code
)
1076 fprintf( stderr
, "invalid state reached %s:%d", __FILE__
, __LINE__
);
1080 if (!dtls1_is_timer_expired(s
))
1082 /* not a timeout, none of our business,
1083 let higher layers handle this. in fact it's probably an error */
1087 if ( ! SSL_in_init(s
)) /* done, no need to send a retransmit */
1089 BIO_set_flags(SSL_get_rbio(s
), BIO_FLAGS_READ
);
1093 #if 0 /* for now, each alert contains only one record number */
1094 item
= pqueue_peek(state
->rcvd_records
);
1097 /* send an alert immediately for all the missing records */
1102 #if 0 /* no more alert sending, just retransmit the last set of messages */
1103 if ( state
->timeout
.read_timeouts
>= DTLS1_TMO_READ_COUNT
)
1104 ssl3_send_alert(s
,SSL3_AL_WARNING
,
1105 DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
);
1108 return dtls1_handle_timeout(s
);
1112 dtls1_get_queue_priority(unsigned short seq
, int is_ccs
)
1114 /* The index of the retransmission queue actually is the message sequence number,
1115 * since the queue only contains messages of a single handshake. However, the
1116 * ChangeCipherSpec has no message sequence number and so using only the sequence
1117 * will result in the CCS and Finished having the same index. To prevent this,
1118 * the sequence number is multiplied by 2. In case of a CCS 1 is subtracted.
1119 * This does not only differ CSS and Finished, it also maintains the order of the
1120 * index (important for priority queues) and fits in the unsigned short variable.
1122 return seq
* 2 - is_ccs
;
1126 dtls1_retransmit_buffered_messages(SSL
*s
)
1128 pqueue sent
= s
->d1
->sent_messages
;
1134 iter
= pqueue_iterator(sent
);
1136 for ( item
= pqueue_next(&iter
); item
!= NULL
; item
= pqueue_next(&iter
))
1138 frag
= (hm_fragment
*)item
->data
;
1139 if ( dtls1_retransmit_message(s
,
1140 (unsigned short)dtls1_get_queue_priority(frag
->msg_header
.seq
, frag
->msg_header
.is_ccs
),
1141 0, &found
) <= 0 && found
)
1143 fprintf(stderr
, "dtls1_retransmit_message() failed\n");
1152 dtls1_buffer_message(SSL
*s
, int is_ccs
)
1156 unsigned char seq64be
[8];
1158 /* this function is called immediately after a message has
1159 * been serialized */
1160 OPENSSL_assert(s
->init_off
== 0);
1162 frag
= dtls1_hm_fragment_new(s
->init_num
, 0);
1164 memcpy(frag
->fragment
, s
->init_buf
->data
, s
->init_num
);
1168 OPENSSL_assert(s
->d1
->w_msg_hdr
.msg_len
+
1169 ((s
->version
==DTLS1_VERSION
)?DTLS1_CCS_HEADER_LENGTH
:3) == (unsigned int)s
->init_num
);
1173 OPENSSL_assert(s
->d1
->w_msg_hdr
.msg_len
+
1174 DTLS1_HM_HEADER_LENGTH
== (unsigned int)s
->init_num
);
1177 frag
->msg_header
.msg_len
= s
->d1
->w_msg_hdr
.msg_len
;
1178 frag
->msg_header
.seq
= s
->d1
->w_msg_hdr
.seq
;
1179 frag
->msg_header
.type
= s
->d1
->w_msg_hdr
.type
;
1180 frag
->msg_header
.frag_off
= 0;
1181 frag
->msg_header
.frag_len
= s
->d1
->w_msg_hdr
.msg_len
;
1182 frag
->msg_header
.is_ccs
= is_ccs
;
1184 /* save current state*/
1185 frag
->msg_header
.saved_retransmit_state
.enc_write_ctx
= s
->enc_write_ctx
;
1186 frag
->msg_header
.saved_retransmit_state
.write_hash
= s
->write_hash
;
1187 frag
->msg_header
.saved_retransmit_state
.compress
= s
->compress
;
1188 frag
->msg_header
.saved_retransmit_state
.session
= s
->session
;
1189 frag
->msg_header
.saved_retransmit_state
.epoch
= s
->d1
->w_epoch
;
1191 memset(seq64be
,0,sizeof(seq64be
));
1192 seq64be
[6] = (unsigned char)(dtls1_get_queue_priority(frag
->msg_header
.seq
,
1193 frag
->msg_header
.is_ccs
)>>8);
1194 seq64be
[7] = (unsigned char)(dtls1_get_queue_priority(frag
->msg_header
.seq
,
1195 frag
->msg_header
.is_ccs
));
1197 item
= pitem_new(seq64be
, frag
);
1200 dtls1_hm_fragment_free(frag
);
1205 fprintf( stderr
, "buffered messge: \ttype = %xx\n", msg_buf
->type
);
1206 fprintf( stderr
, "\t\t\t\t\tlen = %d\n", msg_buf
->len
);
1207 fprintf( stderr
, "\t\t\t\t\tseq_num = %d\n", msg_buf
->seq_num
);
1210 pqueue_insert(s
->d1
->sent_messages
, item
);
1215 dtls1_retransmit_message(SSL
*s
, unsigned short seq
, unsigned long frag_off
,
1219 /* XDTLS: for now assuming that read/writes are blocking */
1222 unsigned long header_length
;
1223 unsigned char seq64be
[8];
1224 struct dtls1_retransmit_state saved_state
;
1225 unsigned char save_write_sequence
[8];
1228 OPENSSL_assert(s->init_num == 0);
1229 OPENSSL_assert(s->init_off == 0);
1232 /* XDTLS: the requested message ought to be found, otherwise error */
1233 memset(seq64be
,0,sizeof(seq64be
));
1234 seq64be
[6] = (unsigned char)(seq
>>8);
1235 seq64be
[7] = (unsigned char)seq
;
1237 item
= pqueue_find(s
->d1
->sent_messages
, seq64be
);
1240 fprintf(stderr
, "retransmit: message %d non-existant\n", seq
);
1246 frag
= (hm_fragment
*)item
->data
;
1248 if ( frag
->msg_header
.is_ccs
)
1249 header_length
= DTLS1_CCS_HEADER_LENGTH
;
1251 header_length
= DTLS1_HM_HEADER_LENGTH
;
1253 memcpy(s
->init_buf
->data
, frag
->fragment
,
1254 frag
->msg_header
.msg_len
+ header_length
);
1255 s
->init_num
= frag
->msg_header
.msg_len
+ header_length
;
1257 dtls1_set_message_header_int(s
, frag
->msg_header
.type
,
1258 frag
->msg_header
.msg_len
, frag
->msg_header
.seq
, 0,
1259 frag
->msg_header
.frag_len
);
1261 /* save current state */
1262 saved_state
.enc_write_ctx
= s
->enc_write_ctx
;
1263 saved_state
.write_hash
= s
->write_hash
;
1264 saved_state
.compress
= s
->compress
;
1265 saved_state
.session
= s
->session
;
1266 saved_state
.epoch
= s
->d1
->w_epoch
;
1267 saved_state
.epoch
= s
->d1
->w_epoch
;
1269 s
->d1
->retransmitting
= 1;
1271 /* restore state in which the message was originally sent */
1272 s
->enc_write_ctx
= frag
->msg_header
.saved_retransmit_state
.enc_write_ctx
;
1273 s
->write_hash
= frag
->msg_header
.saved_retransmit_state
.write_hash
;
1274 s
->compress
= frag
->msg_header
.saved_retransmit_state
.compress
;
1275 s
->session
= frag
->msg_header
.saved_retransmit_state
.session
;
1276 s
->d1
->w_epoch
= frag
->msg_header
.saved_retransmit_state
.epoch
;
1278 if (frag
->msg_header
.saved_retransmit_state
.epoch
== saved_state
.epoch
- 1)
1280 memcpy(save_write_sequence
, s
->s3
->write_sequence
, sizeof(s
->s3
->write_sequence
));
1281 memcpy(s
->s3
->write_sequence
, s
->d1
->last_write_sequence
, sizeof(s
->s3
->write_sequence
));
1284 ret
= dtls1_do_write(s
, frag
->msg_header
.is_ccs
?
1285 SSL3_RT_CHANGE_CIPHER_SPEC
: SSL3_RT_HANDSHAKE
);
1287 /* restore current state */
1288 s
->enc_write_ctx
= saved_state
.enc_write_ctx
;
1289 s
->write_hash
= saved_state
.write_hash
;
1290 s
->compress
= saved_state
.compress
;
1291 s
->session
= saved_state
.session
;
1292 s
->d1
->w_epoch
= saved_state
.epoch
;
1294 if (frag
->msg_header
.saved_retransmit_state
.epoch
== saved_state
.epoch
- 1)
1296 memcpy(s
->d1
->last_write_sequence
, s
->s3
->write_sequence
, sizeof(s
->s3
->write_sequence
));
1297 memcpy(s
->s3
->write_sequence
, save_write_sequence
, sizeof(s
->s3
->write_sequence
));
1300 s
->d1
->retransmitting
= 0;
1302 (void)BIO_flush(SSL_get_wbio(s
));
1306 /* call this function when the buffered messages are no longer needed */
1308 dtls1_clear_record_buffer(SSL
*s
)
1312 for(item
= pqueue_pop(s
->d1
->sent_messages
);
1313 item
!= NULL
; item
= pqueue_pop(s
->d1
->sent_messages
))
1315 dtls1_hm_fragment_free((hm_fragment
*)item
->data
);
1322 dtls1_set_message_header(SSL
*s
, unsigned char *p
, unsigned char mt
,
1323 unsigned long len
, unsigned long frag_off
, unsigned long frag_len
)
1327 s
->d1
->handshake_write_seq
= s
->d1
->next_handshake_write_seq
;
1328 s
->d1
->next_handshake_write_seq
++;
1331 dtls1_set_message_header_int(s
, mt
, len
, s
->d1
->handshake_write_seq
,
1332 frag_off
, frag_len
);
1334 return p
+= DTLS1_HM_HEADER_LENGTH
;
1338 /* don't actually do the writing, wait till the MTU has been retrieved */
1340 dtls1_set_message_header_int(SSL
*s
, unsigned char mt
,
1341 unsigned long len
, unsigned short seq_num
, unsigned long frag_off
,
1342 unsigned long frag_len
)
1344 struct hm_header_st
*msg_hdr
= &s
->d1
->w_msg_hdr
;
1347 msg_hdr
->msg_len
= len
;
1348 msg_hdr
->seq
= seq_num
;
1349 msg_hdr
->frag_off
= frag_off
;
1350 msg_hdr
->frag_len
= frag_len
;
1354 dtls1_fix_message_header(SSL
*s
, unsigned long frag_off
,
1355 unsigned long frag_len
)
1357 struct hm_header_st
*msg_hdr
= &s
->d1
->w_msg_hdr
;
1359 msg_hdr
->frag_off
= frag_off
;
1360 msg_hdr
->frag_len
= frag_len
;
1363 static unsigned char *
1364 dtls1_write_message_header(SSL
*s
, unsigned char *p
)
1366 struct hm_header_st
*msg_hdr
= &s
->d1
->w_msg_hdr
;
1368 *p
++ = msg_hdr
->type
;
1369 l2n3(msg_hdr
->msg_len
, p
);
1371 s2n(msg_hdr
->seq
, p
);
1372 l2n3(msg_hdr
->frag_off
, p
);
1373 l2n3(msg_hdr
->frag_len
, p
);
1381 return (g_probable_mtu
[(sizeof(g_probable_mtu
) /
1382 sizeof(g_probable_mtu
[0])) - 1]);
1386 dtls1_guess_mtu(unsigned int curr_mtu
)
1390 if ( curr_mtu
== 0 )
1391 return g_probable_mtu
[0] ;
1393 for ( i
= 0; i
< sizeof(g_probable_mtu
)/sizeof(g_probable_mtu
[0]); i
++)
1394 if ( curr_mtu
> g_probable_mtu
[i
])
1395 return g_probable_mtu
[i
];
1401 dtls1_get_message_header(unsigned char *data
, struct hm_header_st
*msg_hdr
)
1403 memset(msg_hdr
, 0x00, sizeof(struct hm_header_st
));
1404 msg_hdr
->type
= *(data
++);
1405 n2l3(data
, msg_hdr
->msg_len
);
1407 n2s(data
, msg_hdr
->seq
);
1408 n2l3(data
, msg_hdr
->frag_off
);
1409 n2l3(data
, msg_hdr
->frag_len
);
1413 dtls1_get_ccs_header(unsigned char *data
, struct ccs_header_st
*ccs_hdr
)
1415 memset(ccs_hdr
, 0x00, sizeof(struct ccs_header_st
));
1417 ccs_hdr
->type
= *(data
++);