Revert previous. I don't known why cvs blame tells me I committed this,

but after cross-checking with 1.0.1g sources, they are not coming from
my change.

2 files changed, 584 insertions, 54 deletions

diff --git a/src/lib/libssl/d1_lib.c b/src/lib/libssl/d1_lib.c
index 2c61438f25..750f83e04a 100644
--- a/src/lib/libssl/d1_lib.c
+++ b/src/lib/libssl/d1_lib.c
@@ -57,11 +57,18 @@
  *
  */
 
+#include <sys/param.h>
+#include <sys/socket.h>
+
+#include <netinet/in.h>
+
 #include <stdio.h>
 #include <openssl/objects.h>
 #include "ssl_locl.h"
 
+static void get_current_time(struct timeval *t);
 const char dtls1_version_str[]="DTLSv1" OPENSSL_VERSION_PTEXT;
+int dtls1_listen(SSL *s, struct sockaddr *client);
 
 SSL3_ENC_METHOD DTLSv1_enc_data={
     dtls1_enc,
@@ -75,6 +82,7 @@ SSL3_ENC_METHOD DTLSv1_enc_data={
         TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
         TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
         tls1_alert_code,
+        tls1_export_keying_material,
         };
 
 long dtls1_default_timeout(void)
@@ -84,11 +92,6 @@ long dtls1_default_timeout(void)
         return(60*60*2);
         }
 
-IMPLEMENT_dtls1_meth_func(dtlsv1_base_method,
-                        ssl_undefined_function,
-                        ssl_undefined_function,
-                        ssl_bad_method)
-
 int dtls1_new(SSL *s)
         {
         DTLS1_STATE *d1;
@@ -98,17 +101,12 @@ int dtls1_new(SSL *s)
         memset(d1,0, sizeof *d1);
 
         /* d1->handshake_epoch=0; */
-        d1->bitmap.length=sizeof(d1->bitmap.map) * 8;
-        pq_64bit_init(&(d1->bitmap.map));
-        pq_64bit_init(&(d1->bitmap.max_seq_num));
-        
-        pq_64bit_init(&(d1->next_bitmap.map));
-        pq_64bit_init(&(d1->next_bitmap.max_seq_num));
 
         d1->unprocessed_rcds.q=pqueue_new();
         d1->processed_rcds.q=pqueue_new();
         d1->buffered_messages = pqueue_new();
         d1->sent_messages=pqueue_new();
+        d1->buffered_app_data.q=pqueue_new();
 
         if ( s->server)
                 {
@@ -116,12 +114,13 @@ int dtls1_new(SSL *s)
                 }
 
         if( ! d1->unprocessed_rcds.q || ! d1->processed_rcds.q 
-        || ! d1->buffered_messages || ! d1->sent_messages)
+        || ! d1->buffered_messages || ! d1->sent_messages || ! d1->buffered_app_data.q)
                 {
         if ( d1->unprocessed_rcds.q) pqueue_free(d1->unprocessed_rcds.q);
         if ( d1->processed_rcds.q) pqueue_free(d1->processed_rcds.q);
         if ( d1->buffered_messages) pqueue_free(d1->buffered_messages);
                 if ( d1->sent_messages) pqueue_free(d1->sent_messages);
+                if ( d1->buffered_app_data.q) pqueue_free(d1->buffered_app_data.q);
                 OPENSSL_free(d1);
                 return (0);
                 }
@@ -131,26 +130,33 @@ int dtls1_new(SSL *s)
         return(1);
         }
 
-void dtls1_free(SSL *s)
+static void dtls1_clear_queues(SSL *s)
         {
     pitem *item = NULL;
     hm_fragment *frag = NULL;
-
-        ssl3_free(s);
+        DTLS1_RECORD_DATA *rdata;
 
     while( (item = pqueue_pop(s->d1->unprocessed_rcds.q)) != NULL)
         {
+                rdata = (DTLS1_RECORD_DATA *) item->data;
+                if (rdata->rbuf.buf)
+                        {
+                        OPENSSL_free(rdata->rbuf.buf);
+                        }
         OPENSSL_free(item->data);
         pitem_free(item);
         }
-    pqueue_free(s->d1->unprocessed_rcds.q);
 
     while( (item = pqueue_pop(s->d1->processed_rcds.q)) != NULL)
         {
+                rdata = (DTLS1_RECORD_DATA *) item->data;
+                if (rdata->rbuf.buf)
+                        {
+                        OPENSSL_free(rdata->rbuf.buf);
+                        }
         OPENSSL_free(item->data);
         pitem_free(item);
         }
-    pqueue_free(s->d1->processed_rcds.q);
 
     while( (item = pqueue_pop(s->d1->buffered_messages)) != NULL)
         {
@@ -159,7 +165,6 @@ void dtls1_free(SSL *s)
         OPENSSL_free(frag);
         pitem_free(item);
         }
-    pqueue_free(s->d1->buffered_messages);
 
     while ( (item = pqueue_pop(s->d1->sent_messages)) != NULL)
         {
@@ -168,21 +173,102 @@ void dtls1_free(SSL *s)
         OPENSSL_free(frag);
         pitem_free(item);
         }
-        pqueue_free(s->d1->sent_messages);
 
-        pq_64bit_free(&(s->d1->bitmap.map));
-        pq_64bit_free(&(s->d1->bitmap.max_seq_num));
+        while ( (item = pqueue_pop(s->d1->buffered_app_data.q)) != NULL)
+                {
+                frag = (hm_fragment *)item->data;
+                OPENSSL_free(frag->fragment);
+                OPENSSL_free(frag);
+                pitem_free(item);
+                }
+        }
 
-        pq_64bit_free(&(s->d1->next_bitmap.map));
-        pq_64bit_free(&(s->d1->next_bitmap.max_seq_num));
+void dtls1_free(SSL *s)
+        {
+        ssl3_free(s);
+
+        dtls1_clear_queues(s);
+
+    pqueue_free(s->d1->unprocessed_rcds.q);
+    pqueue_free(s->d1->processed_rcds.q);
+    pqueue_free(s->d1->buffered_messages);
+        pqueue_free(s->d1->sent_messages);
+        pqueue_free(s->d1->buffered_app_data.q);
 
         OPENSSL_free(s->d1);
+        s->d1 = NULL;
         }
 
 void dtls1_clear(SSL *s)
         {
+    pqueue unprocessed_rcds;
+    pqueue processed_rcds;
+    pqueue buffered_messages;
+        pqueue sent_messages;
+        pqueue buffered_app_data;
+        unsigned int mtu;
+
+        if (s->d1)
+                {
+                unprocessed_rcds = s->d1->unprocessed_rcds.q;
+                processed_rcds = s->d1->processed_rcds.q;
+                buffered_messages = s->d1->buffered_messages;
+                sent_messages = s->d1->sent_messages;
+                buffered_app_data = s->d1->buffered_app_data.q;
+                mtu = s->d1->mtu;
+
+                dtls1_clear_queues(s);
+
+                memset(s->d1, 0, sizeof(*(s->d1)));
+
+                if (s->server)
+                        {
+                        s->d1->cookie_len = sizeof(s->d1->cookie);
+                        }
+
+                if (SSL_get_options(s) & SSL_OP_NO_QUERY_MTU)
+                        {
+                        s->d1->mtu = mtu;
+                        }
+
+                s->d1->unprocessed_rcds.q = unprocessed_rcds;
+                s->d1->processed_rcds.q = processed_rcds;
+                s->d1->buffered_messages = buffered_messages;
+                s->d1->sent_messages = sent_messages;
+                s->d1->buffered_app_data.q = buffered_app_data;
+                }
+
         ssl3_clear(s);
-        s->version=DTLS1_VERSION;
+        if (s->options & SSL_OP_CISCO_ANYCONNECT)
+                s->version=DTLS1_BAD_VER;
+        else
+                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);
         }
 
 /*
@@ -192,15 +278,194 @@ void dtls1_clear(SSL *s)
  * to explicitly list their SSL_* codes. Currently RC4 is the only one
  * available, but if new ones emerge, they will have to be added...
  */
-SSL_CIPHER *dtls1_get_cipher(unsigned int u)
+const SSL_CIPHER *dtls1_get_cipher(unsigned int u)
         {
-        SSL_CIPHER *ciph = ssl3_get_cipher(u);
+        const SSL_CIPHER *ciph = ssl3_get_cipher(u);
 
         if (ciph != NULL)
                 {
-                if ((ciph->algorithms&SSL_ENC_MASK) == SSL_RC4)
+                if (ciph->algorithm_enc == SSL_RC4)
                         return NULL;
                 }
 
         return ciph;
         }
+
+void dtls1_start_timer(SSL *s)
+        {
+#ifndef OPENSSL_NO_SCTP
+        /* Disable timer for SCTP */
+        if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
+                {
+                memset(&(s->d1->next_timeout), 0, sizeof(struct timeval));
+                return;
+                }
+#endif
+
+        /* 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 */
+        get_current_time(&(s->d1->next_timeout));
+
+        /* 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 */
+        get_current_time(&timenow);
+
+        /* 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(&(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));
+        /* Clear retransmission buffer */
+        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_CHECK_TIMEOUT_NUM,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;
+
+        s->d1->timeout.read_timeouts++;
+        if (s->d1->timeout.read_timeouts > DTLS1_TMO_READ_COUNT)
+                {
+                s->d1->timeout.read_timeouts = 1;
+                }
+
+#ifndef OPENSSL_NO_HEARTBEATS
+        if (s->tlsext_hb_pending)
+                {
+                s->tlsext_hb_pending = 0;
+                return dtls1_heartbeat(s);
+                }
+#endif
+
+        dtls1_start_timer(s);
+        return dtls1_retransmit_buffered_messages(s);
+        }
+
+static void get_current_time(struct timeval *t)
+{
+        gettimeofday(t, NULL);
+}
+
+int dtls1_listen(SSL *s, struct sockaddr *client)
+        {
+        int ret;
+
+        SSL_set_options(s, SSL_OP_COOKIE_EXCHANGE);
+        s->d1->listen = 1;
+
+        ret = SSL_accept(s);
+        if (ret <= 0) return ret;
+        
+        (void) BIO_dgram_get_peer(SSL_get_rbio(s), client);
+        return 1;
+        }
diff --git a/src/lib/libssl/src/ssl/d1_lib.c b/src/lib/libssl/src/ssl/d1_lib.c
index 2c61438f25..750f83e04a 100644
--- a/src/lib/libssl/src/ssl/d1_lib.c
+++ b/src/lib/libssl/src/ssl/d1_lib.c
@@ -57,11 +57,18 @@
  *
  */
 
+#include <sys/param.h>
+#include <sys/socket.h>
+
+#include <netinet/in.h>
+
 #include <stdio.h>
 #include <openssl/objects.h>
 #include "ssl_locl.h"
 
+static void get_current_time(struct timeval *t);
 const char dtls1_version_str[]="DTLSv1" OPENSSL_VERSION_PTEXT;
+int dtls1_listen(SSL *s, struct sockaddr *client);
 
 SSL3_ENC_METHOD DTLSv1_enc_data={
     dtls1_enc,
@@ -75,6 +82,7 @@ SSL3_ENC_METHOD DTLSv1_enc_data={
         TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
         TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
         tls1_alert_code,
+        tls1_export_keying_material,
         };
 
 long dtls1_default_timeout(void)
@@ -84,11 +92,6 @@ long dtls1_default_timeout(void)
         return(60*60*2);
         }
 
-IMPLEMENT_dtls1_meth_func(dtlsv1_base_method,
-                        ssl_undefined_function,
-                        ssl_undefined_function,
-                        ssl_bad_method)
-
 int dtls1_new(SSL *s)
         {
         DTLS1_STATE *d1;
@@ -98,17 +101,12 @@ int dtls1_new(SSL *s)
         memset(d1,0, sizeof *d1);
 
         /* d1->handshake_epoch=0; */
-        d1->bitmap.length=sizeof(d1->bitmap.map) * 8;
-        pq_64bit_init(&(d1->bitmap.map));
-        pq_64bit_init(&(d1->bitmap.max_seq_num));
-        
-        pq_64bit_init(&(d1->next_bitmap.map));
-        pq_64bit_init(&(d1->next_bitmap.max_seq_num));
 
         d1->unprocessed_rcds.q=pqueue_new();
         d1->processed_rcds.q=pqueue_new();
         d1->buffered_messages = pqueue_new();
         d1->sent_messages=pqueue_new();
+        d1->buffered_app_data.q=pqueue_new();
 
         if ( s->server)
                 {
@@ -116,12 +114,13 @@ int dtls1_new(SSL *s)
                 }
 
         if( ! d1->unprocessed_rcds.q || ! d1->processed_rcds.q 
-        || ! d1->buffered_messages || ! d1->sent_messages)
+        || ! d1->buffered_messages || ! d1->sent_messages || ! d1->buffered_app_data.q)
                 {
         if ( d1->unprocessed_rcds.q) pqueue_free(d1->unprocessed_rcds.q);
         if ( d1->processed_rcds.q) pqueue_free(d1->processed_rcds.q);
         if ( d1->buffered_messages) pqueue_free(d1->buffered_messages);
                 if ( d1->sent_messages) pqueue_free(d1->sent_messages);
+                if ( d1->buffered_app_data.q) pqueue_free(d1->buffered_app_data.q);
                 OPENSSL_free(d1);
                 return (0);
                 }
@@ -131,26 +130,33 @@ int dtls1_new(SSL *s)
         return(1);
         }
 
-void dtls1_free(SSL *s)
+static void dtls1_clear_queues(SSL *s)
         {
     pitem *item = NULL;
     hm_fragment *frag = NULL;
-
-        ssl3_free(s);
+        DTLS1_RECORD_DATA *rdata;
 
     while( (item = pqueue_pop(s->d1->unprocessed_rcds.q)) != NULL)
         {
+                rdata = (DTLS1_RECORD_DATA *) item->data;
+                if (rdata->rbuf.buf)
+                        {
+                        OPENSSL_free(rdata->rbuf.buf);
+                        }
         OPENSSL_free(item->data);
         pitem_free(item);
         }
-    pqueue_free(s->d1->unprocessed_rcds.q);
 
     while( (item = pqueue_pop(s->d1->processed_rcds.q)) != NULL)
         {
+                rdata = (DTLS1_RECORD_DATA *) item->data;
+                if (rdata->rbuf.buf)
+                        {
+                        OPENSSL_free(rdata->rbuf.buf);
+                        }
         OPENSSL_free(item->data);
         pitem_free(item);
         }
-    pqueue_free(s->d1->processed_rcds.q);
 
     while( (item = pqueue_pop(s->d1->buffered_messages)) != NULL)
         {
@@ -159,7 +165,6 @@ void dtls1_free(SSL *s)
         OPENSSL_free(frag);
         pitem_free(item);
         }
-    pqueue_free(s->d1->buffered_messages);
 
     while ( (item = pqueue_pop(s->d1->sent_messages)) != NULL)
         {
@@ -168,21 +173,102 @@ void dtls1_free(SSL *s)
         OPENSSL_free(frag);
         pitem_free(item);
         }
-        pqueue_free(s->d1->sent_messages);
 
-        pq_64bit_free(&(s->d1->bitmap.map));
-        pq_64bit_free(&(s->d1->bitmap.max_seq_num));
+        while ( (item = pqueue_pop(s->d1->buffered_app_data.q)) != NULL)
+                {
+                frag = (hm_fragment *)item->data;
+                OPENSSL_free(frag->fragment);
+                OPENSSL_free(frag);
+                pitem_free(item);
+                }
+        }
 
-        pq_64bit_free(&(s->d1->next_bitmap.map));
-        pq_64bit_free(&(s->d1->next_bitmap.max_seq_num));
+void dtls1_free(SSL *s)
+        {
+        ssl3_free(s);
+
+        dtls1_clear_queues(s);
+
+    pqueue_free(s->d1->unprocessed_rcds.q);
+    pqueue_free(s->d1->processed_rcds.q);
+    pqueue_free(s->d1->buffered_messages);
+        pqueue_free(s->d1->sent_messages);
+        pqueue_free(s->d1->buffered_app_data.q);
 
         OPENSSL_free(s->d1);
+        s->d1 = NULL;
         }
 
 void dtls1_clear(SSL *s)
         {
+    pqueue unprocessed_rcds;
+    pqueue processed_rcds;
+    pqueue buffered_messages;
+        pqueue sent_messages;
+        pqueue buffered_app_data;
+        unsigned int mtu;
+
+        if (s->d1)
+                {
+                unprocessed_rcds = s->d1->unprocessed_rcds.q;
+                processed_rcds = s->d1->processed_rcds.q;
+                buffered_messages = s->d1->buffered_messages;
+                sent_messages = s->d1->sent_messages;
+                buffered_app_data = s->d1->buffered_app_data.q;
+                mtu = s->d1->mtu;
+
+                dtls1_clear_queues(s);
+
+                memset(s->d1, 0, sizeof(*(s->d1)));
+
+                if (s->server)
+                        {
+                        s->d1->cookie_len = sizeof(s->d1->cookie);
+                        }
+
+                if (SSL_get_options(s) & SSL_OP_NO_QUERY_MTU)
+                        {
+                        s->d1->mtu = mtu;
+                        }
+
+                s->d1->unprocessed_rcds.q = unprocessed_rcds;
+                s->d1->processed_rcds.q = processed_rcds;
+                s->d1->buffered_messages = buffered_messages;
+                s->d1->sent_messages = sent_messages;
+                s->d1->buffered_app_data.q = buffered_app_data;
+                }
+
         ssl3_clear(s);
-        s->version=DTLS1_VERSION;
+        if (s->options & SSL_OP_CISCO_ANYCONNECT)
+                s->version=DTLS1_BAD_VER;
+        else
+                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);
         }
 
 /*
@@ -192,15 +278,194 @@ void dtls1_clear(SSL *s)
  * to explicitly list their SSL_* codes. Currently RC4 is the only one
  * available, but if new ones emerge, they will have to be added...
  */
-SSL_CIPHER *dtls1_get_cipher(unsigned int u)
+const SSL_CIPHER *dtls1_get_cipher(unsigned int u)
         {
-        SSL_CIPHER *ciph = ssl3_get_cipher(u);
+        const SSL_CIPHER *ciph = ssl3_get_cipher(u);
 
         if (ciph != NULL)
                 {
-                if ((ciph->algorithms&SSL_ENC_MASK) == SSL_RC4)
+                if (ciph->algorithm_enc == SSL_RC4)
                         return NULL;
                 }
 
         return ciph;
         }
+
+void dtls1_start_timer(SSL *s)
+        {
+#ifndef OPENSSL_NO_SCTP
+        /* Disable timer for SCTP */
+        if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
+                {
+                memset(&(s->d1->next_timeout), 0, sizeof(struct timeval));
+                return;
+                }
+#endif
+
+        /* 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 */
+        get_current_time(&(s->d1->next_timeout));
+
+        /* 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 */
+        get_current_time(&timenow);
+
+        /* 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(&(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));
+        /* Clear retransmission buffer */
+        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_CHECK_TIMEOUT_NUM,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;
+
+        s->d1->timeout.read_timeouts++;
+        if (s->d1->timeout.read_timeouts > DTLS1_TMO_READ_COUNT)
+                {
+                s->d1->timeout.read_timeouts = 1;
+                }
+
+#ifndef OPENSSL_NO_HEARTBEATS
+        if (s->tlsext_hb_pending)
+                {
+                s->tlsext_hb_pending = 0;
+                return dtls1_heartbeat(s);
+                }
+#endif
+
+        dtls1_start_timer(s);
+        return dtls1_retransmit_buffered_messages(s);
+        }
+
+static void get_current_time(struct timeval *t)
+{
+        gettimeofday(t, NULL);
+}
+
+int dtls1_listen(SSL *s, struct sockaddr *client)
+        {
+        int ret;
+
+        SSL_set_options(s, SSL_OP_COOKIE_EXCHANGE);
+        s->d1->listen = 1;
+
+        ret = SSL_accept(s);
+        if (ret <= 0) return ret;
+        
+        (void) BIO_dgram_get_peer(SSL_get_rbio(s), client);
+        return 1;
+        }