Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libssl/d1_lib.c	Lines:	115	188	61.2 %
Date:	2017-11-07	Branches:	43	86	50.0 %


/* $OpenBSD: d1_lib.c,v 1.42 2017/04/10 17:27:33 jsing Exp $ */
/*
 * DTLS implementation written by Nagendra Modadugu
 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
 */
/* ====================================================================
 * Copyright (c) 1999-2005 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    openssl-core@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>

#include <netinet/in.h>

#include <stdio.h>

#include <openssl/objects.h>

#include "pqueue.h"
#include "ssl_locl.h"

static int dtls1_listen(SSL *s, struct sockaddr *client);

SSL3_ENC_METHOD DTLSv1_enc_data = {
	.enc = dtls1_enc,
	.enc_flags = SSL_ENC_FLAG_EXPLICIT_IV,
};

long
dtls1_default_timeout(void)
{
	/* 2 hours, the 24 hours mentioned in the DTLSv1 spec
	 * is way too long for http, the cache would over fill */
	return (60*60*2);
}

int
dtls1_new(SSL *s)
{
	DTLS1_STATE *d1;

	if (!ssl3_new(s))
		return (0);
	if ((d1 = calloc(1, sizeof(*d1))) == NULL) {
		ssl3_free(s);
		return (0);
	}
	if ((d1->internal = calloc(1, sizeof(*d1->internal))) == NULL) {
		free(d1);
		ssl3_free(s);
		return (0);
	}

	/* d1->handshake_epoch=0; */

	d1->internal->unprocessed_rcds.q = pqueue_new();
	d1->internal->processed_rcds.q = pqueue_new();
	d1->internal->buffered_messages = pqueue_new();
	d1->sent_messages = pqueue_new();
	d1->internal->buffered_app_data.q = pqueue_new();

	if (s->server) {
		d1->internal->cookie_len = sizeof(D1I(s)->cookie);
	}

	if (!d1->internal->unprocessed_rcds.q || !d1->internal->processed_rcds.q ||
	    !d1->internal->buffered_messages || !d1->sent_messages ||
	    !d1->internal->buffered_app_data.q) {
		pqueue_free(d1->internal->unprocessed_rcds.q);
		pqueue_free(d1->internal->processed_rcds.q);
		pqueue_free(d1->internal->buffered_messages);
		pqueue_free(d1->sent_messages);
		pqueue_free(d1->internal->buffered_app_data.q);
		free(d1);
		ssl3_free(s);
		return (0);
	}

	s->d1 = d1;
	s->method->internal->ssl_clear(s);
	return (1);
}

static void
dtls1_clear_queues(SSL *s)
{
	pitem *item = NULL;
	hm_fragment *frag = NULL;
	DTLS1_RECORD_DATA *rdata;

	while ((item = pqueue_pop(D1I(s)->unprocessed_rcds.q)) != NULL) {
		rdata = (DTLS1_RECORD_DATA *) item->data;
		free(rdata->rbuf.buf);
		free(item->data);
		pitem_free(item);
	}

	while ((item = pqueue_pop(D1I(s)->processed_rcds.q)) != NULL) {
		rdata = (DTLS1_RECORD_DATA *) item->data;
		free(rdata->rbuf.buf);
		free(item->data);
		pitem_free(item);
	}

	while ((item = pqueue_pop(D1I(s)->buffered_messages)) != NULL) {
		frag = (hm_fragment *)item->data;
		free(frag->fragment);
		free(frag);
		pitem_free(item);
	}

	while ((item = pqueue_pop(s->d1->sent_messages)) != NULL) {
		frag = (hm_fragment *)item->data;
		free(frag->fragment);
		free(frag);
		pitem_free(item);
	}

	while ((item = pqueue_pop(D1I(s)->buffered_app_data.q)) != NULL) {
		rdata = (DTLS1_RECORD_DATA *) item->data;
		free(rdata->rbuf.buf);
		free(item->data);
		pitem_free(item);
	}
}

void
dtls1_free(SSL *s)
{
	if (s == NULL)
		return;

	ssl3_free(s);

	dtls1_clear_queues(s);

	pqueue_free(D1I(s)->unprocessed_rcds.q);
	pqueue_free(D1I(s)->processed_rcds.q);
	pqueue_free(D1I(s)->buffered_messages);
	pqueue_free(s->d1->sent_messages);
	pqueue_free(D1I(s)->buffered_app_data.q);

	freezero(s->d1->internal, sizeof(*s->d1->internal));
	freezero(s->d1, sizeof(*s->d1));

	s->d1 = NULL;
}

void
dtls1_clear(SSL *s)
{
	struct dtls1_state_internal_st *internal;
	pqueue unprocessed_rcds;
	pqueue processed_rcds;
	pqueue buffered_messages;
	pqueue sent_messages;
	pqueue buffered_app_data;
	unsigned int mtu;

	if (s->d1) {
		unprocessed_rcds = D1I(s)->unprocessed_rcds.q;
		processed_rcds = D1I(s)->processed_rcds.q;
		buffered_messages = D1I(s)->buffered_messages;
		sent_messages = s->d1->sent_messages;
		buffered_app_data = D1I(s)->buffered_app_data.q;
		mtu = D1I(s)->mtu;

		dtls1_clear_queues(s);

		memset(s->d1->internal, 0, sizeof(*s->d1->internal));
		internal = s->d1->internal;
		memset(s->d1, 0, sizeof(*s->d1));
		s->d1->internal = internal;

		if (s->server) {
			D1I(s)->cookie_len = sizeof(D1I(s)->cookie);
		}

		if (SSL_get_options(s) & SSL_OP_NO_QUERY_MTU) {
			D1I(s)->mtu = mtu;
		}

		D1I(s)->unprocessed_rcds.q = unprocessed_rcds;
		D1I(s)->processed_rcds.q = processed_rcds;
		D1I(s)->buffered_messages = buffered_messages;
		s->d1->sent_messages = sent_messages;
		D1I(s)->buffered_app_data.q = buffered_app_data;
	}

	ssl3_clear(s);

	s->version = DTLS1_VERSION;
}

long
dtls1_ctrl(SSL *s, int cmd, long larg, void *parg)
{
	int ret = 0;

	switch (cmd) {
	case DTLS_CTRL_GET_TIMEOUT:
		if (dtls1_get_timeout(s, (struct timeval*) parg) != NULL) {
			ret = 1;
		}
		break;
	case DTLS_CTRL_HANDLE_TIMEOUT:
		ret = dtls1_handle_timeout(s);
		break;
	case DTLS_CTRL_LISTEN:
		ret = dtls1_listen(s, parg);
		break;

	default:
		ret = ssl3_ctrl(s, cmd, larg, parg);
		break;
	}
	return (ret);
}

/*
 * As it's impossible to use stream ciphers in "datagram" mode, this
 * simple filter is designed to disengage them in DTLS. Unfortunately
 * there is no universal way to identify stream SSL_CIPHER, so we have
 * to explicitly list their SSL_* codes. Currently RC4 is the only one
 * available, but if new ones emerge, they will have to be added...
 */
const SSL_CIPHER *
dtls1_get_cipher(unsigned int u)
{
	const SSL_CIPHER *ciph = ssl3_get_cipher(u);

	if (ciph != NULL) {
		if (ciph->algorithm_enc == SSL_RC4)
			return NULL;
	}

	return ciph;
}

void
dtls1_start_timer(SSL *s)
{

	/* If timer is not set, initialize duration with 1 second */
	if (s->d1->next_timeout.tv_sec == 0 && s->d1->next_timeout.tv_usec == 0) {
		s->d1->timeout_duration = 1;
	}

	/* Set timeout to current time */
	gettimeofday(&(s->d1->next_timeout), NULL);

	/* Add duration to current time */
	s->d1->next_timeout.tv_sec += s->d1->timeout_duration;
	BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT, 0,
	    &s->d1->next_timeout);
}

struct timeval*
dtls1_get_timeout(SSL *s, struct timeval* timeleft)
{
	struct timeval timenow;

	/* If no timeout is set, just return NULL */
	if (s->d1->next_timeout.tv_sec == 0 && s->d1->next_timeout.tv_usec == 0) {
		return NULL;
	}

	/* Get current time */
	gettimeofday(&timenow, NULL);

	/* If timer already expired, set remaining time to 0 */
	if (s->d1->next_timeout.tv_sec < timenow.tv_sec ||
	    (s->d1->next_timeout.tv_sec == timenow.tv_sec &&
	     s->d1->next_timeout.tv_usec <= timenow.tv_usec)) {
		memset(timeleft, 0, sizeof(struct timeval));
		return timeleft;
	}

	/* Calculate time left until timer expires */
	memcpy(timeleft, &(s->d1->next_timeout), sizeof(struct timeval));
	timeleft->tv_sec -= timenow.tv_sec;
	timeleft->tv_usec -= timenow.tv_usec;
	if (timeleft->tv_usec < 0) {
		timeleft->tv_sec--;
		timeleft->tv_usec += 1000000;
	}

	/* If remaining time is less than 15 ms, set it to 0
	 * to prevent issues because of small devergences with
	 * socket timeouts.
	 */
	if (timeleft->tv_sec == 0 && timeleft->tv_usec < 15000) {
		memset(timeleft, 0, sizeof(struct timeval));
	}


	return timeleft;
}

int
dtls1_is_timer_expired(SSL *s)
{
	struct timeval timeleft;

	/* Get time left until timeout, return false if no timer running */
	if (dtls1_get_timeout(s, &timeleft) == NULL) {
		return 0;
	}

	/* Return false if timer is not expired yet */
	if (timeleft.tv_sec > 0 || timeleft.tv_usec > 0) {
		return 0;
	}

	/* Timer expired, so return true */
	return 1;
}

void
dtls1_double_timeout(SSL *s)
{
	s->d1->timeout_duration *= 2;
	if (s->d1->timeout_duration > 60)
		s->d1->timeout_duration = 60;
	dtls1_start_timer(s);
}

void
dtls1_stop_timer(SSL *s)
{
	/* Reset everything */
	memset(&(D1I(s)->timeout), 0, sizeof(struct dtls1_timeout_st));
	memset(&(s->d1->next_timeout), 0, sizeof(struct timeval));
	s->d1->timeout_duration = 1;
	BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT, 0,
	    &(s->d1->next_timeout));
	/* Clear retransmission buffer */
	dtls1_clear_record_buffer(s);
}

int
dtls1_check_timeout_num(SSL *s)
{
	D1I(s)->timeout.num_alerts++;

	/* Reduce MTU after 2 unsuccessful retransmissions */
	if (D1I(s)->timeout.num_alerts > 2) {
		D1I(s)->mtu = BIO_ctrl(SSL_get_wbio(s),
		    BIO_CTRL_DGRAM_GET_FALLBACK_MTU, 0, NULL);

	}

	if (D1I(s)->timeout.num_alerts > DTLS1_TMO_ALERT_COUNT) {
		/* fail the connection, enough alerts have been sent */
		SSLerror(s, SSL_R_READ_TIMEOUT_EXPIRED);
		return -1;
	}

	return 0;
}

int
dtls1_handle_timeout(SSL *s)
{
	/* if no timer is expired, don't do anything */
	if (!dtls1_is_timer_expired(s)) {
		return 0;
	}

	dtls1_double_timeout(s);

	if (dtls1_check_timeout_num(s) < 0)
		return -1;

	D1I(s)->timeout.read_timeouts++;
	if (D1I(s)->timeout.read_timeouts > DTLS1_TMO_READ_COUNT) {
		D1I(s)->timeout.read_timeouts = 1;
	}

	dtls1_start_timer(s);
	return dtls1_retransmit_buffered_messages(s);
}

int
dtls1_listen(SSL *s, struct sockaddr *client)
{
	int ret;

	/* Ensure there is no state left over from a previous invocation */
	SSL_clear(s);

	SSL_set_options(s, SSL_OP_COOKIE_EXCHANGE);
	D1I(s)->listen = 1;

	ret = SSL_accept(s);
	if (ret <= 0)
		return ret;

	(void)BIO_dgram_get_peer(SSL_get_rbio(s), client);
	return 1;
}

void
dtls1_build_sequence_number(unsigned char *dst, unsigned char *seq,
    unsigned short epoch)
{
	unsigned char dtlsseq[SSL3_SEQUENCE_SIZE];
	unsigned char *p;

	p = dtlsseq;
	s2n(epoch, p);
	memcpy(p, &seq[2], SSL3_SEQUENCE_SIZE - 2);
	memcpy(dst, dtlsseq, SSL3_SEQUENCE_SIZE);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: d1_lib.c,v 1.42 2017/04/10 17:27:33 jsing Exp $ */
2			/*
3			* DTLS implementation written by Nagendra Modadugu
4			* (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
5			*/
6			/* ====================================================================
7			* Copyright (c) 1999-2005 The OpenSSL Project. All rights reserved.
8			*
9			* Redistribution and use in source and binary forms, with or without
10			* modification, are permitted provided that the following conditions
11			* are met:
12			*
13			* 1. Redistributions of source code must retain the above copyright
14			* notice, this list of conditions and the following disclaimer.
15			*
16			* 2. Redistributions in binary form must reproduce the above copyright
17			* notice, this list of conditions and the following disclaimer in
18			* the documentation and/or other materials provided with the
19			* distribution.
20			*
21			* 3. All advertising materials mentioning features or use of this
22			* software must display the following acknowledgment:
23			* "This product includes software developed by the OpenSSL Project
24			* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25			*
26			* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27			* endorse or promote products derived from this software without
28			* prior written permission. For written permission, please contact
29			* openssl-core@OpenSSL.org.
30			*
31			* 5. Products derived from this software may not be called "OpenSSL"
32			* nor may "OpenSSL" appear in their names without prior written
33			* permission of the OpenSSL Project.
34			*
35			* 6. Redistributions of any form whatsoever must retain the following
36			* acknowledgment:
37			* "This product includes software developed by the OpenSSL Project
38			* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39			*
40			* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41			* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43			* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44			* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45			* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46			* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47			* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49			* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50			* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51			* OF THE POSSIBILITY OF SUCH DAMAGE.
52			* ====================================================================
53			*
54			* This product includes cryptographic software written by Eric Young
55			* (eay@cryptsoft.com). This product includes software written by Tim
56			* Hudson (tjh@cryptsoft.com).
57			*
58			*/
59
60			#include <sys/types.h>
61			#include <sys/socket.h>
62			#include <sys/time.h>
63
64			#include <netinet/in.h>
65
66			#include <stdio.h>
67
68			#include <openssl/objects.h>
69
70			#include "pqueue.h"
71			#include "ssl_locl.h"
72
73			static int dtls1_listen(SSL s, struct sockaddr client);
74
75			SSL3_ENC_METHOD DTLSv1_enc_data = {
76			.enc = dtls1_enc,
77			.enc_flags = SSL_ENC_FLAG_EXPLICIT_IV,
78			};
79
80			long
81			dtls1_default_timeout(void)
82			{
83			/* 2 hours, the 24 hours mentioned in the DTLSv1 spec
84			* is way too long for http, the cache would over fill */
85		250	return (60602);
86			}
87
88			int
89			dtls1_new(SSL *s)
90			{
91			DTLS1_STATE *d1;
92
93	✗✓	250	if (!ssl3_new(s))
94			return (0);
95	✗✓	125	if ((d1 = calloc(1, sizeof(*d1))) == NULL) {
96			ssl3_free(s);
97			return (0);
98			}
99	✗✓	125	if ((d1->internal = calloc(1, sizeof(*d1->internal))) == NULL) {
100			free(d1);
101			ssl3_free(s);
102			return (0);
103			}
104
105			/* d1->handshake_epoch=0; */
106
107		125	d1->internal->unprocessed_rcds.q = pqueue_new();
108		125	d1->internal->processed_rcds.q = pqueue_new();
109		125	d1->internal->buffered_messages = pqueue_new();
110		125	d1->sent_messages = pqueue_new();
111		125	d1->internal->buffered_app_data.q = pqueue_new();
112
113	✗✓	125	if (s->server) {
114			d1->internal->cookie_len = sizeof(D1I(s)->cookie);
115			}
116
117	✓✗✓✗ ✗✓	375	if (!d1->internal->unprocessed_rcds.q \|\| !d1->internal->processed_rcds.q \|\|
118	✓✗✓✗	250	!d1->internal->buffered_messages \|\| !d1->sent_messages \|\|
119		125	!d1->internal->buffered_app_data.q) {
120			pqueue_free(d1->internal->unprocessed_rcds.q);
121			pqueue_free(d1->internal->processed_rcds.q);
122			pqueue_free(d1->internal->buffered_messages);
123			pqueue_free(d1->sent_messages);
124			pqueue_free(d1->internal->buffered_app_data.q);
125			free(d1);
126			ssl3_free(s);
127			return (0);
128			}
129
130		125	s->d1 = d1;
131		125	s->method->internal->ssl_clear(s);
132		125	return (1);
133		125	}
134
135			static void
136			dtls1_clear_queues(SSL *s)
137			{
138			pitem *item = NULL;
139			hm_fragment *frag = NULL;
140			DTLS1_RECORD_DATA *rdata;
141
142	✗✓	1422	while ((item = pqueue_pop(D1I(s)->unprocessed_rcds.q)) != NULL) {
143			rdata = (DTLS1_RECORD_DATA *) item->data;
144			free(rdata->rbuf.buf);
145			free(item->data);
146			pitem_free(item);
147			}
148
149	✗✓	474	while ((item = pqueue_pop(D1I(s)->processed_rcds.q)) != NULL) {
150			rdata = (DTLS1_RECORD_DATA *) item->data;
151			free(rdata->rbuf.buf);
152			free(item->data);
153			pitem_free(item);
154			}
155
156	✗✓	474	while ((item = pqueue_pop(D1I(s)->buffered_messages)) != NULL) {
157			frag = (hm_fragment *)item->data;
158			free(frag->fragment);
159			free(frag);
160			pitem_free(item);
161			}
162
163	✓✓	770	while ((item = pqueue_pop(s->d1->sent_messages)) != NULL) {
164		148	frag = (hm_fragment *)item->data;
165		148	free(frag->fragment);
166		148	free(frag);
167		148	pitem_free(item);
168			}
169
170	✗✓	474	while ((item = pqueue_pop(D1I(s)->buffered_app_data.q)) != NULL) {
171			rdata = (DTLS1_RECORD_DATA *) item->data;
172			free(rdata->rbuf.buf);
173			free(item->data);
174			pitem_free(item);
175			}
176		474	}
177
178			void
179			dtls1_free(SSL *s)
180			{
181	✓✗	248	if (s == NULL)
182			return;
183
184		124	ssl3_free(s);
185
186		124	dtls1_clear_queues(s);
187
188		124	pqueue_free(D1I(s)->unprocessed_rcds.q);
189		124	pqueue_free(D1I(s)->processed_rcds.q);
190		124	pqueue_free(D1I(s)->buffered_messages);
191		124	pqueue_free(s->d1->sent_messages);
192		124	pqueue_free(D1I(s)->buffered_app_data.q);
193
194		124	freezero(s->d1->internal, sizeof(*s->d1->internal));
195		124	freezero(s->d1, sizeof(*s->d1));
196
197		124	s->d1 = NULL;
198		248	}
199
200			void
201			dtls1_clear(SSL *s)
202			{
203			struct dtls1_state_internal_st *internal;
204			pqueue unprocessed_rcds;
205			pqueue processed_rcds;
206			pqueue buffered_messages;
207			pqueue sent_messages;
208			pqueue buffered_app_data;
209			unsigned int mtu;
210
211	✓✓	950	if (s->d1) {
212		350	unprocessed_rcds = D1I(s)->unprocessed_rcds.q;
213		350	processed_rcds = D1I(s)->processed_rcds.q;
214		350	buffered_messages = D1I(s)->buffered_messages;
215		350	sent_messages = s->d1->sent_messages;
216		350	buffered_app_data = D1I(s)->buffered_app_data.q;
217		350	mtu = D1I(s)->mtu;
218
219		350	dtls1_clear_queues(s);
220
221		350	memset(s->d1->internal, 0, sizeof(*s->d1->internal));
222		350	internal = s->d1->internal;
223		350	memset(s->d1, 0, sizeof(*s->d1));
224		350	s->d1->internal = internal;
225
226	✓✓	350	if (s->server) {
227		157	D1I(s)->cookie_len = sizeof(D1I(s)->cookie);
228		157	}
229
230	✗✓	350	if (SSL_get_options(s) & SSL_OP_NO_QUERY_MTU) {
231			D1I(s)->mtu = mtu;
232			}
233
234		350	D1I(s)->unprocessed_rcds.q = unprocessed_rcds;
235		350	D1I(s)->processed_rcds.q = processed_rcds;
236		350	D1I(s)->buffered_messages = buffered_messages;
237		350	s->d1->sent_messages = sent_messages;
238		350	D1I(s)->buffered_app_data.q = buffered_app_data;
239		350	}
240
241		475	ssl3_clear(s);
242
243		475	s->version = DTLS1_VERSION;
244		475	}
245
246			long
247			dtls1_ctrl(SSL s, int cmd, long larg, void parg)
248			{
249			int ret = 0;
250
251			switch (cmd) {
252			case DTLS_CTRL_GET_TIMEOUT:
253			if (dtls1_get_timeout(s, (struct timeval*) parg) != NULL) {
254			ret = 1;
255			}
256			break;
257			case DTLS_CTRL_HANDLE_TIMEOUT:
258			ret = dtls1_handle_timeout(s);
259			break;
260			case DTLS_CTRL_LISTEN:
261			ret = dtls1_listen(s, parg);
262			break;
263
264			default:
265			ret = ssl3_ctrl(s, cmd, larg, parg);
266			break;
267			}
268			return (ret);
269			}
270
271			/*
272			* As it's impossible to use stream ciphers in "datagram" mode, this
273			* simple filter is designed to disengage them in DTLS. Unfortunately
274			* there is no universal way to identify stream SSL_CIPHER, so we have
275			* to explicitly list their SSL_* codes. Currently RC4 is the only one
276			* available, but if new ones emerge, they will have to be added...
277			*/
278			const SSL_CIPHER *
279			dtls1_get_cipher(unsigned int u)
280			{
281		27216	const SSL_CIPHER *ciph = ssl3_get_cipher(u);
282
283	✓✗	13608	if (ciph != NULL) {
284	✓✓	13608	if (ciph->algorithm_enc == SSL_RC4)
285		1134	return NULL;
286			}
287
288		12474	return ciph;
289		13608	}
290
291			void
292			dtls1_start_timer(SSL *s)
293			{
294
295			/* If timer is not set, initialize duration with 1 second */
296	✓✓✓✗	908	if (s->d1->next_timeout.tv_sec == 0 && s->d1->next_timeout.tv_usec == 0) {
297		148	s->d1->timeout_duration = 1;
298		148	}
299
300			/* Set timeout to current time */
301		380	gettimeofday(&(s->d1->next_timeout), NULL);
302
303			/* Add duration to current time */
304		380	s->d1->next_timeout.tv_sec += s->d1->timeout_duration;
305		760	BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT, 0,
306		380	&s->d1->next_timeout);
307		380	}
308
309			struct timeval*
310			dtls1_get_timeout(SSL s, struct timeval timeleft)
311			{
312		2944	struct timeval timenow;
313
314			/* If no timeout is set, just return NULL */
315	✓✓✓✗	1864	if (s->d1->next_timeout.tv_sec == 0 && s->d1->next_timeout.tv_usec == 0) {
316		392	return NULL;
317			}
318
319			/* Get current time */
320		1080	gettimeofday(&timenow, NULL);
321
322			/* If timer already expired, set remaining time to 0 */
323	✓✗✗✗	1080	if (s->d1->next_timeout.tv_sec < timenow.tv_sec \|\|
324	✗✓	1080	(s->d1->next_timeout.tv_sec == timenow.tv_sec &&
325			s->d1->next_timeout.tv_usec <= timenow.tv_usec)) {
326			memset(timeleft, 0, sizeof(struct timeval));
327			return timeleft;
328			}
329
330			/* Calculate time left until timer expires */
331		1080	memcpy(timeleft, &(s->d1->next_timeout), sizeof(struct timeval));
332		1080	timeleft->tv_sec -= timenow.tv_sec;
333		1080	timeleft->tv_usec -= timenow.tv_usec;
334	✓✓	1080	if (timeleft->tv_usec < 0) {
335		1050	timeleft->tv_sec--;
336		1050	timeleft->tv_usec += 1000000;
337		1050	}
338
339			/* If remaining time is less than 15 ms, set it to 0
340			* to prevent issues because of small devergences with
341			* socket timeouts.
342			*/
343	✓✓✗✓	2130	if (timeleft->tv_sec == 0 && timeleft->tv_usec < 15000) {
344			memset(timeleft, 0, sizeof(struct timeval));
345			}
346
347
348		1080	return timeleft;
349		1472	}
350
351			int
352			dtls1_is_timer_expired(SSL *s)
353			{
354		2944	struct timeval timeleft;
355
356			/* Get time left until timeout, return false if no timer running */
357	✓✓	1472	if (dtls1_get_timeout(s, &timeleft) == NULL) {
358		392	return 0;
359			}
360
361			/* Return false if timer is not expired yet */
362	✓✓✓✗	2130	if (timeleft.tv_sec > 0 \|\| timeleft.tv_usec > 0) {
363		1080	return 0;
364			}
365
366			/* Timer expired, so return true */
367			return 1;
368		1472	}
369
370			void
371			dtls1_double_timeout(SSL *s)
372			{
373			s->d1->timeout_duration *= 2;
374			if (s->d1->timeout_duration > 60)
375			s->d1->timeout_duration = 60;
376			dtls1_start_timer(s);
377			}
378
379			void
380			dtls1_stop_timer(SSL *s)
381			{
382			/* Reset everything */
383		480	memset(&(D1I(s)->timeout), 0, sizeof(struct dtls1_timeout_st));
384		240	memset(&(s->d1->next_timeout), 0, sizeof(struct timeval));
385		240	s->d1->timeout_duration = 1;
386		480	BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT, 0,
387		240	&(s->d1->next_timeout));
388			/* Clear retransmission buffer */
389		240	dtls1_clear_record_buffer(s);
390		240	}
391
392			int
393			dtls1_check_timeout_num(SSL *s)
394			{
395			D1I(s)->timeout.num_alerts++;
396
397			/* Reduce MTU after 2 unsuccessful retransmissions */
398			if (D1I(s)->timeout.num_alerts > 2) {
399			D1I(s)->mtu = BIO_ctrl(SSL_get_wbio(s),
400			BIO_CTRL_DGRAM_GET_FALLBACK_MTU, 0, NULL);
401
402			}
403
404			if (D1I(s)->timeout.num_alerts > DTLS1_TMO_ALERT_COUNT) {
405			/* fail the connection, enough alerts have been sent */
406			SSLerror(s, SSL_R_READ_TIMEOUT_EXPIRED);
407			return -1;
408			}
409
410			return 0;
411			}
412
413			int
414			dtls1_handle_timeout(SSL *s)
415			{
416			/* if no timer is expired, don't do anything */
417	✓✗	2552	if (!dtls1_is_timer_expired(s)) {
418		1276	return 0;
419			}
420
421			dtls1_double_timeout(s);
422
423			if (dtls1_check_timeout_num(s) < 0)
424			return -1;
425
426			D1I(s)->timeout.read_timeouts++;
427			if (D1I(s)->timeout.read_timeouts > DTLS1_TMO_READ_COUNT) {
428			D1I(s)->timeout.read_timeouts = 1;
429			}
430
431			dtls1_start_timer(s);
432			return dtls1_retransmit_buffered_messages(s);
433		1276	}
434
435			int
436			dtls1_listen(SSL s, struct sockaddr client)
437			{
438			int ret;
439
440			/* Ensure there is no state left over from a previous invocation */
441			SSL_clear(s);
442
443			SSL_set_options(s, SSL_OP_COOKIE_EXCHANGE);
444			D1I(s)->listen = 1;
445
446			ret = SSL_accept(s);
447			if (ret <= 0)
448			return ret;
449
450			(void)BIO_dgram_get_peer(SSL_get_rbio(s), client);
451			return 1;
452			}
453
454			void
455			dtls1_build_sequence_number(unsigned char dst, unsigned char seq,
456			unsigned short epoch)
457			{
458		960	unsigned char dtlsseq[SSL3_SEQUENCE_SIZE];
459			unsigned char *p;
460
461			p = dtlsseq;
462		480	s2n(epoch, p);
463		480	memcpy(p, &seq[2], SSL3_SEQUENCE_SIZE - 2);
464		480	memcpy(dst, dtlsseq, SSL3_SEQUENCE_SIZE);
465		480	}