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PR: 2756

Browse source 
Submitted by: Robin Seggelmann <seggelmann@fh-muenster.de>

Fix DTLS timeout handling.
This commit is contained in:
Dr. Stephen Henson 2012-03-09 15:52:09 +00:00
parent 18ea747ce4
commit ad3d95222d
3 changed files with 30 additions and 26 deletions
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43
ssl/d1_lib.c
View file

@ -381,6 +381,7 @@ void dtls1_double_timeout(SSL *s)
void dtls1_stop_timer(SSL *s)
{
/* Reset everything */
memset(&(s->d1->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));
@ -388,10 +389,28 @@ void dtls1_stop_timer(SSL *s)
dtls1_clear_record_buffer(s);
}
int dtls1_check_timeout_num(SSL *s)
{
s->d1->timeout.num_alerts++;
/* Reduce MTU after 2 unsuccessful retransmissions */
if (s->d1->timeout.num_alerts > 2)
{
s->d1->mtu = BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_GET_FALLBACK_MTU, 0, NULL);
}
if (s->d1->timeout.num_alerts > DTLS1_TMO_ALERT_COUNT)
{
/* fail the connection, enough alerts have been sent */
SSLerr(SSL_F_DTLS1_HANDLE_TIMEOUT,SSL_R_READ_TIMEOUT_EXPIRED);
return -1;
}
return 0;
}
int dtls1_handle_timeout(SSL *s)
{
DTLS1_STATE *state;
/* if no timer is expired, don't do anything */
if (!dtls1_is_timer_expired(s))
{
@ -399,24 +418,14 @@ int dtls1_handle_timeout(SSL *s)
}
dtls1_double_timeout(s);
state = s->d1;
state->timeout.num_alerts++;
if ( state->timeout.num_alerts > DTLS1_TMO_ALERT_COUNT)
{
/* fail the connection, enough alerts have been sent */
SSLerr(SSL_F_DTLS1_HANDLE_TIMEOUT,SSL_R_READ_TIMEOUT_EXPIRED);
if (dtls1_check_timeout_num(s) < 0)
return -1;
}
state->timeout.read_timeouts++;
if ( state->timeout.read_timeouts > DTLS1_TMO_READ_COUNT)
s->d1->timeout.read_timeouts++;
if (s->d1->timeout.read_timeouts > DTLS1_TMO_READ_COUNT)
{
state->timeout.read_timeouts = 1;
}
if (state->timeout_duration > 2)
{
s->d1->mtu = BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_GET_FALLBACK_MTU, 0, NULL);
s->d1->timeout.read_timeouts = 1;
}
dtls1_start_timer(s);

12
ssl/d1_pkt.c
View file

@ -179,7 +179,6 @@ static int dtls1_record_needs_buffering(SSL *s, SSL3_RECORD *rr,
static int dtls1_buffer_record(SSL *s, record_pqueue *q,
unsigned char *priority);
static int dtls1_process_record(SSL *s);
static void dtls1_clear_timeouts(SSL *s);
/* copy buffered record into SSL structure */
static int
@ -682,7 +681,6 @@ again:
goto again; /* get another record */
}
dtls1_clear_timeouts(s); /* done waiting */
return(1);
}
@ -1152,6 +1150,9 @@ start:
*/
if (msg_hdr.type == SSL3_MT_FINISHED)
{
if (dtls1_check_timeout_num(s) < 0)
return -1;
dtls1_retransmit_buffered_messages(s);
rr->length = 0;
goto start;
@ -1765,10 +1766,3 @@ dtls1_reset_seq_numbers(SSL *s, int rw)
memset(seq, 0x00, seq_bytes);
}
static void
dtls1_clear_timeouts(SSL *s)
{
memset(&(s->d1->timeout), 0x00, sizeof(struct dtls1_timeout_st));
}

1
ssl/ssl_locl.h
View file

@ -943,6 +943,7 @@ void dtls1_get_ccs_header(unsigned char *data, struct ccs_header_st *ccs_hdr);
void dtls1_reset_seq_numbers(SSL *s, int rw);
long dtls1_default_timeout(void);
struct timeval* dtls1_get_timeout(SSL *s, struct timeval* timeleft);
int dtls1_check_timeout_num(SSL *s);
int dtls1_handle_timeout(SSL *s);
const SSL_CIPHER *dtls1_get_cipher(unsigned int u);
void dtls1_start_timer(SSL *s);