crypto/bio/bss_dgram.c

   1 /* crypto/bio/bio_dgram.c */
   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 #ifndef OPENSSL_NO_DGRAM
  61
  62 #include <stdio.h>
  63 #include <errno.h>
  64 #define USE_SOCKETS
  65 #include "cryptlib.h"
  66
  67 #include <openssl/bio.h>
  68
  69 #if defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_VMS)
  70 #include <sys/timeb.h>
  71 #endif
  72
  73 #define IP_MTU      14 /* linux is lame */
  74
  75 #ifdef WATT32
  76 #define sock_write SockWrite  /* Watt-32 uses same names */
  77 #define sock_read  SockRead
  78 #define sock_puts  SockPuts
  79 #endif
  80
  81 static int dgram_write(BIO *h, const char *buf, int num);
  82 static int dgram_read(BIO *h, char *buf, int size);
  83 static int dgram_puts(BIO *h, const char *str);
  84 static long dgram_ctrl(BIO *h, int cmd, long arg1, void *arg2);
  85 static int dgram_new(BIO *h);
  86 static int dgram_free(BIO *data);
  87 static int dgram_clear(BIO *bio);
  88
  89 static int BIO_dgram_should_retry(int s);
  90
  91 static void get_current_time(struct timeval *t);
  92
  93 static BIO_METHOD methods_dgramp=
  94         {
  95         BIO_TYPE_DGRAM,
  96         "datagram socket",
  97         dgram_write,
  98         dgram_read,
  99         dgram_puts,
 100         NULL, /* dgram_gets, */
 101         dgram_ctrl,
 102         dgram_new,
 103         dgram_free,
 104         NULL,
 105         };
 106
 107 typedef struct bio_dgram_data_st
 108         {
 109         struct sockaddr peer;
 110         unsigned int connected;
 111         unsigned int _errno;
 112         unsigned int mtu;
 113         struct timeval next_timeout;
 114         struct timeval socket_timeout;
 115         } bio_dgram_data;
 116
 117 BIO_METHOD *BIO_s_datagram(void)
 118         {
 119         return(&methods_dgramp);
 120         }
 121
 122 BIO *BIO_new_dgram(int fd, int close_flag)
 123         {
 124         BIO *ret;
 125
 126         ret=BIO_new(BIO_s_datagram());
 127         if (ret == NULL) return(NULL);
 128         BIO_set_fd(ret,fd,close_flag);
 129         return(ret);
 130         }
 131
 132 static int dgram_new(BIO *bi)
 133         {
 134         bio_dgram_data *data = NULL;
 135
 136         bi->init=0;
 137         bi->num=0;
 138         data = OPENSSL_malloc(sizeof(bio_dgram_data));
 139         if (data == NULL)
 140                 return 0;
 141         memset(data, 0x00, sizeof(bio_dgram_data));
 142     bi->ptr = data;
 143
 144         bi->flags=0;
 145         return(1);
 146         }
 147
 148 static int dgram_free(BIO *a)
 149         {
 150         bio_dgram_data *data;
 151
 152         if (a == NULL) return(0);
 153         if ( ! dgram_clear(a))
 154                 return 0;
 155
 156         data = (bio_dgram_data *)a->ptr;
 157         if(data != NULL) OPENSSL_free(data);
 158
 159         return(1);
 160         }
 161
 162 static int dgram_clear(BIO *a)
 163         {
 164         if (a == NULL) return(0);
 165         if (a->shutdown)
 166                 {
 167                 if (a->init)
 168                         {
 169                         SHUTDOWN2(a->num);
 170                         }
 171                 a->init=0;
 172                 a->flags=0;
 173                 }
 174         return(1);
 175         }
 176
 177 static void dgram_adjust_rcv_timeout(BIO *b)
 178         {
 179 #if defined(SO_RCVTIMEO)
 180         bio_dgram_data *data = (bio_dgram_data *)b->ptr;
 181         int sz = sizeof(int);
 182
 183         /* Is a timer active? */
 184         if (data->next_timeout.tv_sec > 0 || data->next_timeout.tv_usec > 0)
 185                 {
 186                 struct timeval timenow, timeleft;
 187
 188                 /* Read current socket timeout */
 189 #ifdef OPENSSL_SYS_WINDOWS
 190                 int timeout;
 191                 if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 192                                            (void*)&timeout, &sz) < 0)
 193                         { perror("getsockopt"); }
 194                 else
 195                         {
 196                         data->socket_timeout.tv_sec = timeout / 1000;
 197                         data->socket_timeout.tv_usec = (timeout % 1000) * 1000;
 198                         }
 199 #else
 200                 if ( getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 201                                                 &(data->socket_timeout), (void *)&sz) < 0)
 202                         { perror("getsockopt"); }
 203 #endif
 204
 205                 /* Get current time */
 206                 get_current_time(&timenow);
 207
 208                 /* Calculate time left until timer expires */
 209                 memcpy(&timeleft, &(data->next_timeout), sizeof(struct timeval));
 210                 timeleft.tv_sec -= timenow.tv_sec;
 211                 timeleft.tv_usec -= timenow.tv_usec;
 212                 if (timeleft.tv_usec < 0)
 213                         {
 214                         timeleft.tv_sec--;
 215                         timeleft.tv_usec += 1000000;
 216                         }
 217
 218                 /* Adjust socket timeout if next handhake message timer
 219                  * will expire earlier.
 220                  */
 221                 if (data->socket_timeout.tv_sec < timeleft.tv_sec ||
 222                         (data->socket_timeout.tv_sec == timeleft.tv_sec &&
 223                          data->socket_timeout.tv_usec <= timeleft.tv_usec))
 224                         {
 225 #ifdef OPENSSL_SYS_WINDOWS
 226                         timeout = timeleft.tv_sec * 1000 + timeleft.tv_usec / 1000;
 227                         if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 228                                                    (void*)&timeout, sizeof(timeout)) < 0)
 229                                 { perror("setsockopt"); }
 230 #else
 231                         if ( setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, &timeleft,
 232                                                         sizeof(struct timeval)) < 0)
 233                                 { perror("setsockopt"); }
 234 #endif
 235                         }
 236                 }
 237 #endif
 238         }
 239
 240 static void dgram_reset_rcv_timeout(BIO *b)
 241         {
 242 #if defined(SO_RCVTIMEO)
 243         bio_dgram_data *data = (bio_dgram_data *)b->ptr;
 244 #ifdef OPENSSL_SYS_WINDOWS
 245         int timeout = data->socket_timeout.tv_sec * 1000 +
 246                                   data->socket_timeout.tv_usec / 1000;
 247         if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 248                                    (void*)&timeout, sizeof(timeout)) < 0)
 249                 { perror("setsockopt"); }
 250 #else
 251         if ( setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, &(data->socket_timeout),
 252                                         sizeof(struct timeval)) < 0)
 253                 { perror("setsockopt"); }
 254 #endif
 255 #endif
 256         }
 257
 258 static int dgram_read(BIO *b, char *out, int outl)
 259         {
 260         int ret=0;
 261         bio_dgram_data *data = (bio_dgram_data *)b->ptr;
 262
 263         struct sockaddr peer;
 264         int peerlen = sizeof(peer);
 265
 266         if (out != NULL)
 267                 {
 268                 clear_socket_error();
 269                 memset(&peer, 0x00, peerlen);
 270                 /* Last arg in recvfrom is signed on some platforms and
 271                  * unsigned on others. It is of type socklen_t on some
 272                  * but this is not universal. Cast to (void *) to avoid
 273                  * compiler warnings.
 274                  */
 275                 dgram_adjust_rcv_timeout(b);
 276                 ret=recvfrom(b->num,out,outl,0,&peer,(void *)&peerlen);
 277                 dgram_reset_rcv_timeout(b);
 278
 279                 if ( ! data->connected  && ret > 0)
 280                         BIO_ctrl(b, BIO_CTRL_DGRAM_CONNECT, 0, &peer);
 281
 282                 BIO_clear_retry_flags(b);
 283                 if (ret <= 0)
 284                         {
 285                         if (BIO_dgram_should_retry(ret))
 286                                 {
 287                                 BIO_set_retry_read(b);
 288                                 data->_errno = get_last_socket_error();
 289                                 }
 290 #if 0
 291                         memset(&(data->hstimeout), 0, sizeof(struct timeval));
 292 #endif
 293                         }
 294                 }
 295         return(ret);
 296         }
 297
 298 static int dgram_write(BIO *b, const char *in, int inl)
 299         {
 300         int ret;
 301         bio_dgram_data *data = (bio_dgram_data *)b->ptr;
 302         clear_socket_error();
 303
 304     if ( data->connected )
 305         ret=writesocket(b->num,in,inl);
 306     else
 307 #if defined(NETWARE_CLIB) && defined(NETWARE_BSDSOCK)
 308         ret=sendto(b->num, (char *)in, inl, 0, &data->peer, sizeof(data->peer));
 309 #else
 310         ret=sendto(b->num, in, inl, 0, &data->peer, sizeof(data->peer));
 311 #endif
 312
 313         BIO_clear_retry_flags(b);
 314         if (ret <= 0)
 315                 {
 316                 if (BIO_sock_should_retry(ret))
 317                         {
 318                         BIO_set_retry_write(b);
 319                         data->_errno = get_last_socket_error();
 320
 321 #if 0 /* higher layers are responsible for querying MTU, if necessary */
 322                         if ( data->_errno == EMSGSIZE)
 323                                 /* retrieve the new MTU */
 324                                 BIO_ctrl(b, BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
 325 #endif
 326                         }
 327                 }
 328         return(ret);
 329         }
 330
 331 static long dgram_ctrl(BIO *b, int cmd, long num, void *ptr)
 332         {
 333         long ret=1;
 334         int *ip;
 335         struct sockaddr *to = NULL;
 336         bio_dgram_data *data = NULL;
 337         long sockopt_val = 0;
 338         unsigned int sockopt_len = 0;
 339
 340         data = (bio_dgram_data *)b->ptr;
 341
 342         switch (cmd)
 343                 {
 344         case BIO_CTRL_RESET:
 345                 num=0;
 346         case BIO_C_FILE_SEEK:
 347                 ret=0;
 348                 break;
 349         case BIO_C_FILE_TELL:
 350         case BIO_CTRL_INFO:
 351                 ret=0;
 352                 break;
 353         case BIO_C_SET_FD:
 354                 dgram_clear(b);
 355                 b->num= *((int *)ptr);
 356                 b->shutdown=(int)num;
 357                 b->init=1;
 358                 break;
 359         case BIO_C_GET_FD:
 360                 if (b->init)
 361                         {
 362                         ip=(int *)ptr;
 363                         if (ip != NULL) *ip=b->num;
 364                         ret=b->num;
 365                         }
 366                 else
 367                         ret= -1;
 368                 break;
 369         case BIO_CTRL_GET_CLOSE:
 370                 ret=b->shutdown;
 371                 break;
 372         case BIO_CTRL_SET_CLOSE:
 373                 b->shutdown=(int)num;
 374                 break;
 375         case BIO_CTRL_PENDING:
 376         case BIO_CTRL_WPENDING:
 377                 ret=0;
 378                 break;
 379         case BIO_CTRL_DUP:
 380         case BIO_CTRL_FLUSH:
 381                 ret=1;
 382                 break;
 383         case BIO_CTRL_DGRAM_CONNECT:
 384                 to = (struct sockaddr *)ptr;
 385 #if 0
 386                 if (connect(b->num, to, sizeof(struct sockaddr)) < 0)
 387                         { perror("connect"); ret = 0; }
 388                 else
 389                         {
 390 #endif
 391                         memcpy(&(data->peer),to, sizeof(struct sockaddr));
 392 #if 0
 393                         }
 394 #endif
 395                 break;
 396                 /* (Linux)kernel sets DF bit on outgoing IP packets */
 397 #ifdef IP_MTU_DISCOVER
 398         case BIO_CTRL_DGRAM_MTU_DISCOVER:
 399                 sockopt_val = IP_PMTUDISC_DO;
 400                 if ((ret = setsockopt(b->num, IPPROTO_IP, IP_MTU_DISCOVER,
 401                         &sockopt_val, sizeof(sockopt_val))) < 0)
 402                         perror("setsockopt");
 403                 break;
 404 #endif
 405         case BIO_CTRL_DGRAM_QUERY_MTU:
 406          sockopt_len = sizeof(sockopt_val);
 407                 if ((ret = getsockopt(b->num, IPPROTO_IP, IP_MTU, (void *)&sockopt_val,
 408                         &sockopt_len)) < 0 || sockopt_val < 0)
 409                         { ret = 0; }
 410                 else
 411                         {
 412                         data->mtu = sockopt_val;
 413                         ret = data->mtu;
 414                         }
 415                 break;
 416         case BIO_CTRL_DGRAM_GET_MTU:
 417                 return data->mtu;
 418                 break;
 419         case BIO_CTRL_DGRAM_SET_MTU:
 420                 data->mtu = num;
 421                 ret = num;
 422                 break;
 423         case BIO_CTRL_DGRAM_SET_CONNECTED:
 424                 to = (struct sockaddr *)ptr;
 425
 426                 if ( to != NULL)
 427                         {
 428                         data->connected = 1;
 429                         memcpy(&(data->peer),to, sizeof(struct sockaddr));
 430                         }
 431                 else
 432                         {
 433                         data->connected = 0;
 434                         memset(&(data->peer), 0x00, sizeof(struct sockaddr));
 435                         }
 436                 break;
 437     case BIO_CTRL_DGRAM_SET_PEER:
 438         to = (struct sockaddr *) ptr;
 439
 440         memcpy(&(data->peer), to, sizeof(struct sockaddr));
 441         break;
 442         case BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT:
 443                 memcpy(&(data->next_timeout), ptr, sizeof(struct timeval));
 444                 break;
 445 #if defined(SO_RCVTIMEO)
 446         case BIO_CTRL_DGRAM_SET_RECV_TIMEOUT:
 447 #ifdef OPENSSL_SYS_WINDOWS
 448                 {
 449                 struct timeval *tv = (struct timeval *)ptr;
 450                 int timeout = tv->tv_sec * 1000 + tv->tv_usec/1000;
 451                 if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 452                         (void*)&timeout, sizeof(timeout)) < 0)
 453                         { perror("setsockopt"); ret = -1; }
 454                 }
 455 #else
 456                 if ( setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, ptr,
 457                         sizeof(struct timeval)) < 0)
 458                         { perror("setsockopt"); ret = -1; }
 459 #endif
 460                 break;
 461         case BIO_CTRL_DGRAM_GET_RECV_TIMEOUT:
 462 #ifdef OPENSSL_SYS_WINDOWS
 463                 {
 464                 int timeout, sz = sizeof(timeout);
 465                 struct timeval *tv = (struct timeval *)ptr;
 466                 if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 467                         (void*)&timeout, &sz) < 0)
 468                         { perror("getsockopt"); ret = -1; }
 469                 else
 470                         {
 471                         tv->tv_sec = timeout / 1000;
 472                         tv->tv_usec = (timeout % 1000) * 1000;
 473                         ret = sizeof(*tv);
 474                         }
 475                 }
 476 #else
 477                 if ( getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 478                         ptr, (void *)&ret) < 0)
 479                         { perror("getsockopt"); ret = -1; }
 480 #endif
 481                 break;
 482 #endif
 483 #if defined(SO_SNDTIMEO)
 484         case BIO_CTRL_DGRAM_SET_SEND_TIMEOUT:
 485 #ifdef OPENSSL_SYS_WINDOWS
 486                 {
 487                 struct timeval *tv = (struct timeval *)ptr;
 488                 int timeout = tv->tv_sec * 1000 + tv->tv_usec/1000;
 489                 if (setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
 490                         (void*)&timeout, sizeof(timeout)) < 0)
 491                         { perror("setsockopt"); ret = -1; }
 492                 }
 493 #else
 494                 if ( setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO, ptr,
 495                         sizeof(struct timeval)) < 0)
 496                         { perror("setsockopt"); ret = -1; }
 497 #endif
 498                 break;
 499         case BIO_CTRL_DGRAM_GET_SEND_TIMEOUT:
 500 #ifdef OPENSSL_SYS_WINDOWS
 501                 {
 502                 int timeout, sz = sizeof(timeout);
 503                 struct timeval *tv = (struct timeval *)ptr;
 504                 if (getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
 505                         (void*)&timeout, &sz) < 0)
 506                         { perror("getsockopt"); ret = -1; }
 507                 else
 508                         {
 509                         tv->tv_sec = timeout / 1000;
 510                         tv->tv_usec = (timeout % 1000) * 1000;
 511                         ret = sizeof(*tv);
 512                         }
 513                 }
 514 #else
 515                 if ( getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
 516                         ptr, (void *)&ret) < 0)
 517                         { perror("getsockopt"); ret = -1; }
 518 #endif
 519                 break;
 520 #endif
 521         case BIO_CTRL_DGRAM_GET_SEND_TIMER_EXP:
 522                 /* fall-through */
 523         case BIO_CTRL_DGRAM_GET_RECV_TIMER_EXP:
 524 #ifdef OPENSSL_SYS_WINDOWS
 525                 if ( data->_errno == WSAETIMEDOUT)
 526 #else
 527                 if ( data->_errno == EAGAIN)
 528 #endif
 529                         {
 530                         ret = 1;
 531                         data->_errno = 0;
 532                         }
 533                 else
 534                         ret = 0;
 535                 break;
 536 #ifdef EMSGSIZE
 537         case BIO_CTRL_DGRAM_MTU_EXCEEDED:
 538                 if ( data->_errno == EMSGSIZE)
 539                         {
 540                         ret = 1;
 541                         data->_errno = 0;
 542                         }
 543                 else
 544                         ret = 0;
 545                 break;
 546 #endif
 547         default:
 548                 ret=0;
 549                 break;
 550                 }
 551         return(ret);
 552         }
 553
 554 static int dgram_puts(BIO *bp, const char *str)
 555         {
 556         int n,ret;
 557
 558         n=strlen(str);
 559         ret=dgram_write(bp,str,n);
 560         return(ret);
 561         }
 562
 563 static int BIO_dgram_should_retry(int i)
 564         {
 565         int err;
 566
 567         if ((i == 0) || (i == -1))
 568                 {
 569                 err=get_last_socket_error();
 570
 571 #if defined(OPENSSL_SYS_WINDOWS) && 0 /* more microsoft stupidity? perhaps not? Ben 4/1/99 */
 572                 if ((i == -1) && (err == 0))
 573                         return(1);
 574 #endif
 575
 576                 return(BIO_dgram_non_fatal_error(err));
 577                 }
 578         return(0);
 579         }
 580
 581 int BIO_dgram_non_fatal_error(int err)
 582         {
 583         switch (err)
 584                 {
 585 #if defined(OPENSSL_SYS_WINDOWS)
 586 # if defined(WSAEWOULDBLOCK)
 587         case WSAEWOULDBLOCK:
 588 # endif
 589
 590 # if 0 /* This appears to always be an error */
 591 #  if defined(WSAENOTCONN)
 592         case WSAENOTCONN:
 593 #  endif
 594 # endif
 595 #endif
 596
 597 #ifdef EWOULDBLOCK
 598 # ifdef WSAEWOULDBLOCK
 599 #  if WSAEWOULDBLOCK != EWOULDBLOCK
 600         case EWOULDBLOCK:
 601 #  endif
 602 # else
 603         case EWOULDBLOCK:
 604 # endif
 605 #endif
 606
 607 #if defined(ENOTCONN)
 608         case ENOTCONN:
 609 #endif
 610
 611 #ifdef EINTR
 612         case EINTR:
 613 #endif
 614
 615 #ifdef EAGAIN
 616 #if EWOULDBLOCK != EAGAIN
 617         case EAGAIN:
 618 # endif
 619 #endif
 620
 621 #ifdef EPROTO
 622         case EPROTO:
 623 #endif
 624
 625 #ifdef EINPROGRESS
 626         case EINPROGRESS:
 627 #endif
 628
 629 #ifdef EALREADY
 630         case EALREADY:
 631 #endif
 632
 633 /* DF bit set, and packet larger than MTU */
 634 #ifdef EMSGSIZE
 635         case EMSGSIZE:
 636 #endif
 637
 638                 return(1);
 639                 /* break; */
 640         default:
 641                 break;
 642                 }
 643         return(0);
 644         }
 645 #endif
 646
 647 static void get_current_time(struct timeval *t)
 648         {
 649 #ifdef OPENSSL_SYS_WIN32
 650         struct _timeb tb;
 651         _ftime(&tb);
 652         t->tv_sec = (long)tb.time;
 653         t->tv_usec = (long)tb.millitm * 1000;
 654 #elif defined(OPENSSL_SYS_VMS)
 655         struct timeb tb;
 656         ftime(&tb);
 657         t->tv_sec = (long)tb.time;
 658         t->tv_usec = (long)tb.millitm * 1000;
 659 #else
 660         gettimeofday(t, NULL);
 661 #endif
 662         }