d1_lib.c revision 280297
1160814Ssimon/* ssl/d1_lib.c */ 2280297Sjkim/* 3160814Ssimon * DTLS implementation written by Nagendra Modadugu 4280297Sjkim * (nagendra@cs.stanford.edu) for the OpenSSL project 2005. 5160814Ssimon */ 6160814Ssimon/* ==================================================================== 7160814Ssimon * Copyright (c) 1999-2005 The OpenSSL Project. All rights reserved. 8160814Ssimon * 9160814Ssimon * Redistribution and use in source and binary forms, with or without 10160814Ssimon * modification, are permitted provided that the following conditions 11160814Ssimon * are met: 12160814Ssimon * 13160814Ssimon * 1. Redistributions of source code must retain the above copyright 14280297Sjkim * notice, this list of conditions and the following disclaimer. 15160814Ssimon * 16160814Ssimon * 2. Redistributions in binary form must reproduce the above copyright 17160814Ssimon * notice, this list of conditions and the following disclaimer in 18160814Ssimon * the documentation and/or other materials provided with the 19160814Ssimon * distribution. 20160814Ssimon * 21160814Ssimon * 3. All advertising materials mentioning features or use of this 22160814Ssimon * software must display the following acknowledgment: 23160814Ssimon * "This product includes software developed by the OpenSSL Project 24160814Ssimon * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 25160814Ssimon * 26160814Ssimon * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 27160814Ssimon * endorse or promote products derived from this software without 28160814Ssimon * prior written permission. For written permission, please contact 29160814Ssimon * openssl-core@OpenSSL.org. 30160814Ssimon * 31160814Ssimon * 5. Products derived from this software may not be called "OpenSSL" 32160814Ssimon * nor may "OpenSSL" appear in their names without prior written 33160814Ssimon * permission of the OpenSSL Project. 34160814Ssimon * 35160814Ssimon * 6. Redistributions of any form whatsoever must retain the following 36160814Ssimon * acknowledgment: 37160814Ssimon * "This product includes software developed by the OpenSSL Project 38160814Ssimon * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 39160814Ssimon * 40160814Ssimon * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 41160814Ssimon * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42160814Ssimon * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 43160814Ssimon * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 44160814Ssimon * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 45160814Ssimon * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 46160814Ssimon * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 47160814Ssimon * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48160814Ssimon * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 49160814Ssimon * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 50160814Ssimon * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 51160814Ssimon * OF THE POSSIBILITY OF SUCH DAMAGE. 52160814Ssimon * ==================================================================== 53160814Ssimon * 54160814Ssimon * This product includes cryptographic software written by Eric Young 55160814Ssimon * (eay@cryptsoft.com). This product includes software written by Tim 56160814Ssimon * Hudson (tjh@cryptsoft.com). 57160814Ssimon * 58160814Ssimon */ 59160814Ssimon 60160814Ssimon#include <stdio.h> 61205128Ssimon#define USE_SOCKETS 62160814Ssimon#include <openssl/objects.h> 63160814Ssimon#include "ssl_locl.h" 64160814Ssimon 65205128Ssimon#if defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_VMS) 66280297Sjkim# include <sys/timeb.h> 67205128Ssimon#endif 68205128Ssimon 69205128Ssimonstatic void get_current_time(struct timeval *t); 70280297Sjkimconst char dtls1_version_str[] = "DTLSv1" OPENSSL_VERSION_PTEXT; 71205128Ssimonint dtls1_listen(SSL *s, struct sockaddr *client); 72160814Ssimon 73280297SjkimSSL3_ENC_METHOD DTLSv1_enc_data = { 74160814Ssimon dtls1_enc, 75280297Sjkim tls1_mac, 76280297Sjkim tls1_setup_key_block, 77280297Sjkim tls1_generate_master_secret, 78280297Sjkim tls1_change_cipher_state, 79280297Sjkim tls1_final_finish_mac, 80280297Sjkim TLS1_FINISH_MAC_LENGTH, 81280297Sjkim tls1_cert_verify_mac, 82280297Sjkim TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE, 83280297Sjkim TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE, 84280297Sjkim tls1_alert_code, 85280297Sjkim tls1_export_keying_material, 86280297Sjkim}; 87160814Ssimon 88160814Ssimonlong dtls1_default_timeout(void) 89280297Sjkim{ 90280297Sjkim /* 91280297Sjkim * 2 hours, the 24 hours mentioned in the DTLSv1 spec is way too long for 92280297Sjkim * http, the cache would over fill 93280297Sjkim */ 94280297Sjkim return (60 * 60 * 2); 95280297Sjkim} 96160814Ssimon 97160814Ssimonint dtls1_new(SSL *s) 98280297Sjkim{ 99280297Sjkim DTLS1_STATE *d1; 100160814Ssimon 101280297Sjkim if (!ssl3_new(s)) 102280297Sjkim return (0); 103280297Sjkim if ((d1 = OPENSSL_malloc(sizeof *d1)) == NULL) 104280297Sjkim return (0); 105280297Sjkim memset(d1, 0, sizeof *d1); 106160814Ssimon 107280297Sjkim /* d1->handshake_epoch=0; */ 108160814Ssimon 109280297Sjkim d1->unprocessed_rcds.q = pqueue_new(); 110280297Sjkim d1->processed_rcds.q = pqueue_new(); 111280297Sjkim d1->buffered_messages = pqueue_new(); 112280297Sjkim d1->sent_messages = pqueue_new(); 113280297Sjkim d1->buffered_app_data.q = pqueue_new(); 114160814Ssimon 115280297Sjkim if (s->server) { 116280297Sjkim d1->cookie_len = sizeof(s->d1->cookie); 117280297Sjkim } 118160814Ssimon 119280297Sjkim d1->link_mtu = 0; 120280297Sjkim d1->mtu = 0; 121276861Sjkim 122280297Sjkim if (!d1->unprocessed_rcds.q || !d1->processed_rcds.q 123280297Sjkim || !d1->buffered_messages || !d1->sent_messages 124280297Sjkim || !d1->buffered_app_data.q) { 125280297Sjkim if (d1->unprocessed_rcds.q) 126280297Sjkim pqueue_free(d1->unprocessed_rcds.q); 127280297Sjkim if (d1->processed_rcds.q) 128280297Sjkim pqueue_free(d1->processed_rcds.q); 129280297Sjkim if (d1->buffered_messages) 130280297Sjkim pqueue_free(d1->buffered_messages); 131280297Sjkim if (d1->sent_messages) 132280297Sjkim pqueue_free(d1->sent_messages); 133280297Sjkim if (d1->buffered_app_data.q) 134280297Sjkim pqueue_free(d1->buffered_app_data.q); 135280297Sjkim OPENSSL_free(d1); 136280297Sjkim return (0); 137280297Sjkim } 138160814Ssimon 139280297Sjkim s->d1 = d1; 140280297Sjkim s->method->ssl_clear(s); 141280297Sjkim return (1); 142280297Sjkim} 143160814Ssimon 144237657Sjkimstatic void dtls1_clear_queues(SSL *s) 145280297Sjkim{ 146160814Ssimon pitem *item = NULL; 147160814Ssimon hm_fragment *frag = NULL; 148280297Sjkim DTLS1_RECORD_DATA *rdata; 149160814Ssimon 150280297Sjkim while ((item = pqueue_pop(s->d1->unprocessed_rcds.q)) != NULL) { 151280297Sjkim rdata = (DTLS1_RECORD_DATA *)item->data; 152280297Sjkim if (rdata->rbuf.buf) { 153280297Sjkim OPENSSL_free(rdata->rbuf.buf); 154280297Sjkim } 155160814Ssimon OPENSSL_free(item->data); 156160814Ssimon pitem_free(item); 157280297Sjkim } 158280297Sjkim 159280297Sjkim while ((item = pqueue_pop(s->d1->processed_rcds.q)) != NULL) { 160280297Sjkim rdata = (DTLS1_RECORD_DATA *)item->data; 161280297Sjkim if (rdata->rbuf.buf) { 162280297Sjkim OPENSSL_free(rdata->rbuf.buf); 163160814Ssimon } 164160814Ssimon OPENSSL_free(item->data); 165160814Ssimon pitem_free(item); 166280297Sjkim } 167160814Ssimon 168280297Sjkim while ((item = pqueue_pop(s->d1->buffered_messages)) != NULL) { 169160814Ssimon frag = (hm_fragment *)item->data; 170276861Sjkim dtls1_hm_fragment_free(frag); 171160814Ssimon pitem_free(item); 172280297Sjkim } 173160814Ssimon 174280297Sjkim while ((item = pqueue_pop(s->d1->sent_messages)) != NULL) { 175160814Ssimon frag = (hm_fragment *)item->data; 176276861Sjkim dtls1_hm_fragment_free(frag); 177160814Ssimon pitem_free(item); 178280297Sjkim } 179280297Sjkim 180280297Sjkim while ((item = pqueue_pop(s->d1->buffered_app_data.q)) != NULL) { 181280297Sjkim rdata = (DTLS1_RECORD_DATA *)item->data; 182280297Sjkim if (rdata->rbuf.buf) { 183280297Sjkim OPENSSL_free(rdata->rbuf.buf); 184160814Ssimon } 185280297Sjkim OPENSSL_free(item->data); 186280297Sjkim pitem_free(item); 187280297Sjkim } 188280297Sjkim} 189160814Ssimon 190237657Sjkimvoid dtls1_free(SSL *s) 191280297Sjkim{ 192280297Sjkim ssl3_free(s); 193237657Sjkim 194280297Sjkim dtls1_clear_queues(s); 195237657Sjkim 196237657Sjkim pqueue_free(s->d1->unprocessed_rcds.q); 197237657Sjkim pqueue_free(s->d1->processed_rcds.q); 198237657Sjkim pqueue_free(s->d1->buffered_messages); 199280297Sjkim pqueue_free(s->d1->sent_messages); 200280297Sjkim pqueue_free(s->d1->buffered_app_data.q); 201160814Ssimon 202280297Sjkim OPENSSL_free(s->d1); 203280297Sjkim s->d1 = NULL; 204280297Sjkim} 205160814Ssimon 206160814Ssimonvoid dtls1_clear(SSL *s) 207280297Sjkim{ 208237657Sjkim pqueue unprocessed_rcds; 209237657Sjkim pqueue processed_rcds; 210237657Sjkim pqueue buffered_messages; 211280297Sjkim pqueue sent_messages; 212280297Sjkim pqueue buffered_app_data; 213280297Sjkim unsigned int mtu; 214280297Sjkim unsigned int link_mtu; 215237657Sjkim 216280297Sjkim if (s->d1) { 217280297Sjkim unprocessed_rcds = s->d1->unprocessed_rcds.q; 218280297Sjkim processed_rcds = s->d1->processed_rcds.q; 219280297Sjkim buffered_messages = s->d1->buffered_messages; 220280297Sjkim sent_messages = s->d1->sent_messages; 221280297Sjkim buffered_app_data = s->d1->buffered_app_data.q; 222280297Sjkim mtu = s->d1->mtu; 223280297Sjkim link_mtu = s->d1->link_mtu; 224237657Sjkim 225280297Sjkim dtls1_clear_queues(s); 226237657Sjkim 227280297Sjkim memset(s->d1, 0, sizeof(*(s->d1))); 228237657Sjkim 229280297Sjkim if (s->server) { 230280297Sjkim s->d1->cookie_len = sizeof(s->d1->cookie); 231280297Sjkim } 232237657Sjkim 233280297Sjkim if (SSL_get_options(s) & SSL_OP_NO_QUERY_MTU) { 234280297Sjkim s->d1->mtu = mtu; 235280297Sjkim s->d1->link_mtu = link_mtu; 236280297Sjkim } 237237657Sjkim 238280297Sjkim s->d1->unprocessed_rcds.q = unprocessed_rcds; 239280297Sjkim s->d1->processed_rcds.q = processed_rcds; 240280297Sjkim s->d1->buffered_messages = buffered_messages; 241280297Sjkim s->d1->sent_messages = sent_messages; 242280297Sjkim s->d1->buffered_app_data.q = buffered_app_data; 243280297Sjkim } 244237657Sjkim 245280297Sjkim ssl3_clear(s); 246280297Sjkim if (s->options & SSL_OP_CISCO_ANYCONNECT) 247280297Sjkim s->version = DTLS1_BAD_VER; 248280297Sjkim else 249280297Sjkim s->version = DTLS1_VERSION; 250280297Sjkim} 251194206Ssimon 252205128Ssimonlong dtls1_ctrl(SSL *s, int cmd, long larg, void *parg) 253280297Sjkim{ 254280297Sjkim int ret = 0; 255205128Ssimon 256280297Sjkim switch (cmd) { 257280297Sjkim case DTLS_CTRL_GET_TIMEOUT: 258280297Sjkim if (dtls1_get_timeout(s, (struct timeval *)parg) != NULL) { 259280297Sjkim ret = 1; 260280297Sjkim } 261280297Sjkim break; 262280297Sjkim case DTLS_CTRL_HANDLE_TIMEOUT: 263280297Sjkim ret = dtls1_handle_timeout(s); 264280297Sjkim break; 265280297Sjkim case DTLS_CTRL_LISTEN: 266280297Sjkim ret = dtls1_listen(s, parg); 267280297Sjkim break; 268280297Sjkim case SSL_CTRL_CHECK_PROTO_VERSION: 269280297Sjkim /* 270280297Sjkim * For library-internal use; checks that the current protocol is the 271280297Sjkim * highest enabled version (according to s->ctx->method, as version 272280297Sjkim * negotiation may have changed s->method). 273280297Sjkim */ 274273144Sjkim#if DTLS_MAX_VERSION != DTLS1_VERSION 275280297Sjkim# error Code needs update for DTLS_method() support beyond DTLS1_VERSION. 276273144Sjkim#endif 277280297Sjkim /* 278280297Sjkim * Just one protocol version is supported so far; fail closed if the 279280297Sjkim * version is not as expected. 280280297Sjkim */ 281280297Sjkim return s->version == DTLS_MAX_VERSION; 282280297Sjkim case DTLS_CTRL_SET_LINK_MTU: 283280297Sjkim if (larg < (long)dtls1_link_min_mtu()) 284280297Sjkim return 0; 285280297Sjkim s->d1->link_mtu = larg; 286280297Sjkim return 1; 287280297Sjkim case DTLS_CTRL_GET_LINK_MIN_MTU: 288280297Sjkim return (long)dtls1_link_min_mtu(); 289280297Sjkim case SSL_CTRL_SET_MTU: 290280297Sjkim /* 291280297Sjkim * We may not have a BIO set yet so can't call dtls1_min_mtu() 292280297Sjkim * We'll have to make do with dtls1_link_min_mtu() and max overhead 293280297Sjkim */ 294280297Sjkim if (larg < (long)dtls1_link_min_mtu() - DTLS1_MAX_MTU_OVERHEAD) 295280297Sjkim return 0; 296280297Sjkim s->d1->mtu = larg; 297280297Sjkim return larg; 298280297Sjkim default: 299280297Sjkim ret = ssl3_ctrl(s, cmd, larg, parg); 300280297Sjkim break; 301280297Sjkim } 302280297Sjkim return (ret); 303280297Sjkim} 304205128Ssimon 305194206Ssimon/* 306194206Ssimon * As it's impossible to use stream ciphers in "datagram" mode, this 307194206Ssimon * simple filter is designed to disengage them in DTLS. Unfortunately 308194206Ssimon * there is no universal way to identify stream SSL_CIPHER, so we have 309194206Ssimon * to explicitly list their SSL_* codes. Currently RC4 is the only one 310194206Ssimon * available, but if new ones emerge, they will have to be added... 311194206Ssimon */ 312238405Sjkimconst SSL_CIPHER *dtls1_get_cipher(unsigned int u) 313280297Sjkim{ 314280297Sjkim const SSL_CIPHER *ciph = ssl3_get_cipher(u); 315194206Ssimon 316280297Sjkim if (ciph != NULL) { 317280297Sjkim if (ciph->algorithm_enc == SSL_RC4) 318280297Sjkim return NULL; 319280297Sjkim } 320194206Ssimon 321280297Sjkim return ciph; 322280297Sjkim} 323205128Ssimon 324205128Ssimonvoid dtls1_start_timer(SSL *s) 325280297Sjkim{ 326238405Sjkim#ifndef OPENSSL_NO_SCTP 327280297Sjkim /* Disable timer for SCTP */ 328280297Sjkim if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 329280297Sjkim memset(&(s->d1->next_timeout), 0, sizeof(struct timeval)); 330280297Sjkim return; 331280297Sjkim } 332238405Sjkim#endif 333238405Sjkim 334280297Sjkim /* If timer is not set, initialize duration with 1 second */ 335280297Sjkim if (s->d1->next_timeout.tv_sec == 0 && s->d1->next_timeout.tv_usec == 0) { 336280297Sjkim s->d1->timeout_duration = 1; 337280297Sjkim } 338205128Ssimon 339280297Sjkim /* Set timeout to current time */ 340280297Sjkim get_current_time(&(s->d1->next_timeout)); 341205128Ssimon 342280297Sjkim /* Add duration to current time */ 343280297Sjkim s->d1->next_timeout.tv_sec += s->d1->timeout_duration; 344280297Sjkim BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT, 0, 345280297Sjkim &(s->d1->next_timeout)); 346280297Sjkim} 347205128Ssimon 348280297Sjkimstruct timeval *dtls1_get_timeout(SSL *s, struct timeval *timeleft) 349280297Sjkim{ 350280297Sjkim struct timeval timenow; 351205128Ssimon 352280297Sjkim /* If no timeout is set, just return NULL */ 353280297Sjkim if (s->d1->next_timeout.tv_sec == 0 && s->d1->next_timeout.tv_usec == 0) { 354280297Sjkim return NULL; 355280297Sjkim } 356205128Ssimon 357280297Sjkim /* Get current time */ 358280297Sjkim get_current_time(&timenow); 359205128Ssimon 360280297Sjkim /* If timer already expired, set remaining time to 0 */ 361280297Sjkim if (s->d1->next_timeout.tv_sec < timenow.tv_sec || 362280297Sjkim (s->d1->next_timeout.tv_sec == timenow.tv_sec && 363280297Sjkim s->d1->next_timeout.tv_usec <= timenow.tv_usec)) { 364280297Sjkim memset(timeleft, 0, sizeof(struct timeval)); 365280297Sjkim return timeleft; 366280297Sjkim } 367205128Ssimon 368280297Sjkim /* Calculate time left until timer expires */ 369280297Sjkim memcpy(timeleft, &(s->d1->next_timeout), sizeof(struct timeval)); 370280297Sjkim timeleft->tv_sec -= timenow.tv_sec; 371280297Sjkim timeleft->tv_usec -= timenow.tv_usec; 372280297Sjkim if (timeleft->tv_usec < 0) { 373280297Sjkim timeleft->tv_sec--; 374280297Sjkim timeleft->tv_usec += 1000000; 375280297Sjkim } 376215697Ssimon 377280297Sjkim /* 378280297Sjkim * If remaining time is less than 15 ms, set it to 0 to prevent issues 379280297Sjkim * because of small devergences with socket timeouts. 380280297Sjkim */ 381280297Sjkim if (timeleft->tv_sec == 0 && timeleft->tv_usec < 15000) { 382280297Sjkim memset(timeleft, 0, sizeof(struct timeval)); 383280297Sjkim } 384205128Ssimon 385280297Sjkim return timeleft; 386280297Sjkim} 387280297Sjkim 388205128Ssimonint dtls1_is_timer_expired(SSL *s) 389280297Sjkim{ 390280297Sjkim struct timeval timeleft; 391205128Ssimon 392280297Sjkim /* Get time left until timeout, return false if no timer running */ 393280297Sjkim if (dtls1_get_timeout(s, &timeleft) == NULL) { 394280297Sjkim return 0; 395280297Sjkim } 396205128Ssimon 397280297Sjkim /* Return false if timer is not expired yet */ 398280297Sjkim if (timeleft.tv_sec > 0 || timeleft.tv_usec > 0) { 399280297Sjkim return 0; 400280297Sjkim } 401205128Ssimon 402280297Sjkim /* Timer expired, so return true */ 403280297Sjkim return 1; 404280297Sjkim} 405205128Ssimon 406205128Ssimonvoid dtls1_double_timeout(SSL *s) 407280297Sjkim{ 408280297Sjkim s->d1->timeout_duration *= 2; 409280297Sjkim if (s->d1->timeout_duration > 60) 410280297Sjkim s->d1->timeout_duration = 60; 411280297Sjkim dtls1_start_timer(s); 412280297Sjkim} 413205128Ssimon 414205128Ssimonvoid dtls1_stop_timer(SSL *s) 415280297Sjkim{ 416280297Sjkim /* Reset everything */ 417280297Sjkim memset(&(s->d1->timeout), 0, sizeof(struct dtls1_timeout_st)); 418280297Sjkim memset(&(s->d1->next_timeout), 0, sizeof(struct timeval)); 419280297Sjkim s->d1->timeout_duration = 1; 420280297Sjkim BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT, 0, 421280297Sjkim &(s->d1->next_timeout)); 422280297Sjkim /* Clear retransmission buffer */ 423280297Sjkim dtls1_clear_record_buffer(s); 424280297Sjkim} 425205128Ssimon 426237657Sjkimint dtls1_check_timeout_num(SSL *s) 427280297Sjkim{ 428280297Sjkim unsigned int mtu; 429276861Sjkim 430280297Sjkim s->d1->timeout.num_alerts++; 431205128Ssimon 432280297Sjkim /* Reduce MTU after 2 unsuccessful retransmissions */ 433280297Sjkim if (s->d1->timeout.num_alerts > 2 434280297Sjkim && !(SSL_get_options(s) & SSL_OP_NO_QUERY_MTU)) { 435280297Sjkim mtu = 436280297Sjkim BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_GET_FALLBACK_MTU, 0, 437280297Sjkim NULL); 438280297Sjkim if (mtu < s->d1->mtu) 439280297Sjkim s->d1->mtu = mtu; 440280297Sjkim } 441205128Ssimon 442280297Sjkim if (s->d1->timeout.num_alerts > DTLS1_TMO_ALERT_COUNT) { 443280297Sjkim /* fail the connection, enough alerts have been sent */ 444280297Sjkim SSLerr(SSL_F_DTLS1_CHECK_TIMEOUT_NUM, SSL_R_READ_TIMEOUT_EXPIRED); 445280297Sjkim return -1; 446280297Sjkim } 447237657Sjkim 448280297Sjkim return 0; 449280297Sjkim} 450237657Sjkim 451237657Sjkimint dtls1_handle_timeout(SSL *s) 452280297Sjkim{ 453280297Sjkim /* if no timer is expired, don't do anything */ 454280297Sjkim if (!dtls1_is_timer_expired(s)) { 455280297Sjkim return 0; 456280297Sjkim } 457205128Ssimon 458280297Sjkim dtls1_double_timeout(s); 459237657Sjkim 460280297Sjkim if (dtls1_check_timeout_num(s) < 0) 461280297Sjkim return -1; 462237657Sjkim 463280297Sjkim s->d1->timeout.read_timeouts++; 464280297Sjkim if (s->d1->timeout.read_timeouts > DTLS1_TMO_READ_COUNT) { 465280297Sjkim s->d1->timeout.read_timeouts = 1; 466280297Sjkim } 467238405Sjkim#ifndef OPENSSL_NO_HEARTBEATS 468280297Sjkim if (s->tlsext_hb_pending) { 469280297Sjkim s->tlsext_hb_pending = 0; 470280297Sjkim return dtls1_heartbeat(s); 471280297Sjkim } 472238405Sjkim#endif 473238405Sjkim 474280297Sjkim dtls1_start_timer(s); 475280297Sjkim return dtls1_retransmit_buffered_messages(s); 476280297Sjkim} 477205128Ssimon 478205128Ssimonstatic void get_current_time(struct timeval *t) 479205128Ssimon{ 480205128Ssimon#ifdef OPENSSL_SYS_WIN32 481280297Sjkim struct _timeb tb; 482280297Sjkim _ftime(&tb); 483280297Sjkim t->tv_sec = (long)tb.time; 484280297Sjkim t->tv_usec = (long)tb.millitm * 1000; 485205128Ssimon#elif defined(OPENSSL_SYS_VMS) 486280297Sjkim struct timeb tb; 487280297Sjkim ftime(&tb); 488280297Sjkim t->tv_sec = (long)tb.time; 489280297Sjkim t->tv_usec = (long)tb.millitm * 1000; 490205128Ssimon#else 491280297Sjkim gettimeofday(t, NULL); 492205128Ssimon#endif 493205128Ssimon} 494205128Ssimon 495205128Ssimonint dtls1_listen(SSL *s, struct sockaddr *client) 496280297Sjkim{ 497280297Sjkim int ret; 498205128Ssimon 499280297Sjkim SSL_set_options(s, SSL_OP_COOKIE_EXCHANGE); 500280297Sjkim s->d1->listen = 1; 501205128Ssimon 502280297Sjkim ret = SSL_accept(s); 503280297Sjkim if (ret <= 0) 504280297Sjkim return ret; 505280297Sjkim 506280297Sjkim (void)BIO_dgram_get_peer(SSL_get_rbio(s), client); 507280297Sjkim return 1; 508280297Sjkim} 509