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                         memset(&(data->hstimeout), 0, sizeof(struct timeval));
 291                         }
 292                 }
 293         return(ret);
 294         }
 295
 296 static int dgram_write(BIO *b, const char *in, int inl)
 297         {
 298         int ret;
 299         bio_dgram_data *data = (bio_dgram_data *)b->ptr;
 300         clear_socket_error();
 301
 302     if ( data->connected )
 303         ret=writesocket(b->num,in,inl);
 304     else
 305 #if defined(NETWARE_CLIB) && defined(NETWARE_BSDSOCK)
 306         ret=sendto(b->num, (char *)in, inl, 0, &data->peer, sizeof(data->peer));
 307 #else
 308         ret=sendto(b->num, in, inl, 0, &data->peer, sizeof(data->peer));
 309 #endif
 310
 311         BIO_clear_retry_flags(b);
 312         if (ret <= 0)
 313                 {
 314                 if (BIO_sock_should_retry(ret))
 315                         {
 316                         BIO_set_retry_write(b);
 317                         data->_errno = get_last_socket_error();
 318
 319 #if 0 /* higher layers are responsible for querying MTU, if necessary */
 320                         if ( data->_errno == EMSGSIZE)
 321                                 /* retrieve the new MTU */
 322                                 BIO_ctrl(b, BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
 323 #endif
 324                         }
 325                 }
 326         return(ret);
 327         }
 328
 329 static long dgram_ctrl(BIO *b, int cmd, long num, void *ptr)
 330         {
 331         long ret=1;
 332         int *ip;
 333         struct sockaddr *to = NULL;
 334         bio_dgram_data *data = NULL;
 335         long sockopt_val = 0;
 336         unsigned int sockopt_len = 0;
 337
 338         data = (bio_dgram_data *)b->ptr;
 339
 340         switch (cmd)
 341                 {
 342         case BIO_CTRL_RESET:
 343                 num=0;
 344         case BIO_C_FILE_SEEK:
 345                 ret=0;
 346                 break;
 347         case BIO_C_FILE_TELL:
 348         case BIO_CTRL_INFO:
 349                 ret=0;
 350                 break;
 351         case BIO_C_SET_FD:
 352                 dgram_clear(b);
 353                 b->num= *((int *)ptr);
 354                 b->shutdown=(int)num;
 355                 b->init=1;
 356                 break;
 357         case BIO_C_GET_FD:
 358                 if (b->init)
 359                         {
 360                         ip=(int *)ptr;
 361                         if (ip != NULL) *ip=b->num;
 362                         ret=b->num;
 363                         }
 364                 else
 365                         ret= -1;
 366                 break;
 367         case BIO_CTRL_GET_CLOSE:
 368                 ret=b->shutdown;
 369                 break;
 370         case BIO_CTRL_SET_CLOSE:
 371                 b->shutdown=(int)num;
 372                 break;
 373         case BIO_CTRL_PENDING:
 374         case BIO_CTRL_WPENDING:
 375                 ret=0;
 376                 break;
 377         case BIO_CTRL_DUP:
 378         case BIO_CTRL_FLUSH:
 379                 ret=1;
 380                 break;
 381         case BIO_CTRL_DGRAM_CONNECT:
 382                 to = (struct sockaddr *)ptr;
 383 #if 0
 384                 if (connect(b->num, to, sizeof(struct sockaddr)) < 0)
 385                         { perror("connect"); ret = 0; }
 386                 else
 387                         {
 388 #endif
 389                         memcpy(&(data->peer),to, sizeof(struct sockaddr));
 390 #if 0
 391                         }
 392 #endif
 393                 break;
 394                 /* (Linux)kernel sets DF bit on outgoing IP packets */
 395 #ifdef IP_MTU_DISCOVER
 396         case BIO_CTRL_DGRAM_MTU_DISCOVER:
 397                 sockopt_val = IP_PMTUDISC_DO;
 398                 if ((ret = setsockopt(b->num, IPPROTO_IP, IP_MTU_DISCOVER,
 399                         &sockopt_val, sizeof(sockopt_val))) < 0)
 400                         perror("setsockopt");
 401                 break;
 402 #endif
 403         case BIO_CTRL_DGRAM_QUERY_MTU:
 404          sockopt_len = sizeof(sockopt_val);
 405                 if ((ret = getsockopt(b->num, IPPROTO_IP, IP_MTU, (void *)&sockopt_val,
 406                         &sockopt_len)) < 0 || sockopt_val < 0)
 407                         { ret = 0; }
 408                 else
 409                         {
 410                         data->mtu = sockopt_val;
 411                         ret = data->mtu;
 412                         }
 413                 break;
 414         case BIO_CTRL_DGRAM_GET_MTU:
 415                 return data->mtu;
 416                 break;
 417         case BIO_CTRL_DGRAM_SET_MTU:
 418                 data->mtu = num;
 419                 ret = num;
 420                 break;
 421         case BIO_CTRL_DGRAM_SET_CONNECTED:
 422                 to = (struct sockaddr *)ptr;
 423
 424                 if ( to != NULL)
 425                         {
 426                         data->connected = 1;
 427                         memcpy(&(data->peer),to, sizeof(struct sockaddr));
 428                         }
 429                 else
 430                         {
 431                         data->connected = 0;
 432                         memset(&(data->peer), 0x00, sizeof(struct sockaddr));
 433                         }
 434                 break;
 435     case BIO_CTRL_DGRAM_SET_PEER:
 436         to = (struct sockaddr *) ptr;
 437
 438         memcpy(&(data->peer), to, sizeof(struct sockaddr));
 439         break;
 440         case BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT:
 441                 memcpy(&(data->next_timeout), ptr, sizeof(struct timeval));
 442                 break;
 443 #if defined(SO_RCVTIMEO)
 444         case BIO_CTRL_DGRAM_SET_RECV_TIMEOUT:
 445 #ifdef OPENSSL_SYS_WINDOWS
 446                 {
 447                 struct timeval *tv = (struct timeval *)ptr;
 448                 int timeout = tv->tv_sec * 1000 + tv->tv_usec/1000;
 449                 if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 450                         (void*)&timeout, sizeof(timeout)) < 0)
 451                         { perror("setsockopt"); ret = -1; }
 452                 }
 453 #else
 454                 if ( setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, ptr,
 455                         sizeof(struct timeval)) < 0)
 456                         { perror("setsockopt"); ret = -1; }
 457 #endif
 458                 break;
 459         case BIO_CTRL_DGRAM_GET_RECV_TIMEOUT:
 460 #ifdef OPENSSL_SYS_WINDOWS
 461                 {
 462                 int timeout, sz = sizeof(timeout);
 463                 struct timeval *tv = (struct timeval *)ptr;
 464                 if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 465                         (void*)&timeout, &sz) < 0)
 466                         { perror("getsockopt"); ret = -1; }
 467                 else
 468                         {
 469                         tv->tv_sec = timeout / 1000;
 470                         tv->tv_usec = (timeout % 1000) * 1000;
 471                         ret = sizeof(*tv);
 472                         }
 473                 }
 474 #else
 475                 if ( getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 476                         ptr, (void *)&ret) < 0)
 477                         { perror("getsockopt"); ret = -1; }
 478 #endif
 479                 break;
 480 #endif
 481 #if defined(SO_SNDTIMEO)
 482         case BIO_CTRL_DGRAM_SET_SEND_TIMEOUT:
 483 #ifdef OPENSSL_SYS_WINDOWS
 484                 {
 485                 struct timeval *tv = (struct timeval *)ptr;
 486                 int timeout = tv->tv_sec * 1000 + tv->tv_usec/1000;
 487                 if (setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
 488                         (void*)&timeout, sizeof(timeout)) < 0)
 489                         { perror("setsockopt"); ret = -1; }
 490                 }
 491 #else
 492                 if ( setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO, ptr,
 493                         sizeof(struct timeval)) < 0)
 494                         { perror("setsockopt"); ret = -1; }
 495 #endif
 496                 break;
 497         case BIO_CTRL_DGRAM_GET_SEND_TIMEOUT:
 498 #ifdef OPENSSL_SYS_WINDOWS
 499                 {
 500                 int timeout, sz = sizeof(timeout);
 501                 struct timeval *tv = (struct timeval *)ptr;
 502                 if (getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
 503                         (void*)&timeout, &sz) < 0)
 504                         { perror("getsockopt"); ret = -1; }
 505                 else
 506                         {
 507                         tv->tv_sec = timeout / 1000;
 508                         tv->tv_usec = (timeout % 1000) * 1000;
 509                         ret = sizeof(*tv);
 510                         }
 511                 }
 512 #else
 513                 if ( getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
 514                         ptr, (void *)&ret) < 0)
 515                         { perror("getsockopt"); ret = -1; }
 516 #endif
 517                 break;
 518 #endif
 519         case BIO_CTRL_DGRAM_GET_SEND_TIMER_EXP:
 520                 /* fall-through */
 521         case BIO_CTRL_DGRAM_GET_RECV_TIMER_EXP:
 522 #ifdef OPENSSL_SYS_WINDOWS
 523                 if ( data->_errno == WSAETIMEDOUT)
 524 #else
 525                 if ( data->_errno == EAGAIN)
 526 #endif
 527                         {
 528                         ret = 1;
 529                         data->_errno = 0;
 530                         }
 531                 else
 532                         ret = 0;
 533                 break;
 534 #ifdef EMSGSIZE
 535         case BIO_CTRL_DGRAM_MTU_EXCEEDED:
 536                 if ( data->_errno == EMSGSIZE)
 537                         {
 538                         ret = 1;
 539                         data->_errno = 0;
 540                         }
 541                 else
 542                         ret = 0;
 543                 break;
 544 #endif
 545         default:
 546                 ret=0;
 547                 break;
 548                 }
 549         return(ret);
 550         }
 551
 552 static int dgram_puts(BIO *bp, const char *str)
 553         {
 554         int n,ret;
 555
 556         n=strlen(str);
 557         ret=dgram_write(bp,str,n);
 558         return(ret);
 559         }
 560
 561 static int BIO_dgram_should_retry(int i)
 562         {
 563         int err;
 564
 565         if ((i == 0) || (i == -1))
 566                 {
 567                 err=get_last_socket_error();
 568
 569 #if defined(OPENSSL_SYS_WINDOWS) && 0 /* more microsoft stupidity? perhaps not? Ben 4/1/99 */
 570                 if ((i == -1) && (err == 0))
 571                         return(1);
 572 #endif
 573
 574                 return(BIO_dgram_non_fatal_error(err));
 575                 }
 576         return(0);
 577         }
 578
 579 int BIO_dgram_non_fatal_error(int err)
 580         {
 581         switch (err)
 582                 {
 583 #if defined(OPENSSL_SYS_WINDOWS)
 584 # if defined(WSAEWOULDBLOCK)
 585         case WSAEWOULDBLOCK:
 586 # endif
 587
 588 # if 0 /* This appears to always be an error */
 589 #  if defined(WSAENOTCONN)
 590         case WSAENOTCONN:
 591 #  endif
 592 # endif
 593 #endif
 594
 595 #ifdef EWOULDBLOCK
 596 # ifdef WSAEWOULDBLOCK
 597 #  if WSAEWOULDBLOCK != EWOULDBLOCK
 598         case EWOULDBLOCK:
 599 #  endif
 600 # else
 601         case EWOULDBLOCK:
 602 # endif
 603 #endif
 604
 605 #if defined(ENOTCONN)
 606         case ENOTCONN:
 607 #endif
 608
 609 #ifdef EINTR
 610         case EINTR:
 611 #endif
 612
 613 #ifdef EAGAIN
 614 #if EWOULDBLOCK != EAGAIN
 615         case EAGAIN:
 616 # endif
 617 #endif
 618
 619 #ifdef EPROTO
 620         case EPROTO:
 621 #endif
 622
 623 #ifdef EINPROGRESS
 624         case EINPROGRESS:
 625 #endif
 626
 627 #ifdef EALREADY
 628         case EALREADY:
 629 #endif
 630
 631 /* DF bit set, and packet larger than MTU */
 632 #ifdef EMSGSIZE
 633         case EMSGSIZE:
 634 #endif
 635
 636                 return(1);
 637                 /* break; */
 638         default:
 639                 break;
 640                 }
 641         return(0);
 642         }
 643 #endif
 644
 645 static void get_current_time(struct timeval *t)
 646         {
 647 #ifdef OPENSSL_SYS_WIN32
 648         struct _timeb tb;
 649         _ftime(&tb);
 650         t->tv_sec = (long)tb.time;
 651         t->tv_usec = (long)tb.millitm * 1000;
 652 #elif defined(OPENSSL_SYS_VMS)
 653         struct timeb tb;
 654         ftime(&tb);
 655         t->tv_sec = (long)tb.time;
 656         t->tv_usec = (long)tb.millitm * 1000;
 657 #else
 658         gettimeofday(t, NULL);
 659 #endif
 660         }