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 #ifdef OPENSSL_SYS_LINUX
  74 #define IP_MTU      14 /* linux is lame */
  75 #endif
  76
  77 #ifdef WATT32
  78 #define sock_write SockWrite  /* Watt-32 uses same names */
  79 #define sock_read  SockRead
  80 #define sock_puts  SockPuts
  81 #endif
  82
  83 static int dgram_write(BIO *h, const char *buf, int num);
  84 static int dgram_read(BIO *h, char *buf, int size);
  85 static int dgram_puts(BIO *h, const char *str);
  86 static long dgram_ctrl(BIO *h, int cmd, long arg1, void *arg2);
  87 static int dgram_new(BIO *h);
  88 static int dgram_free(BIO *data);
  89 static int dgram_clear(BIO *bio);
  90
  91 static int BIO_dgram_should_retry(int s);
  92
  93 static void get_current_time(struct timeval *t);
  94
  95 static BIO_METHOD methods_dgramp=
  96         {
  97         BIO_TYPE_DGRAM,
  98         "datagram socket",
  99         dgram_write,
 100         dgram_read,
 101         dgram_puts,
 102         NULL, /* dgram_gets, */
 103         dgram_ctrl,
 104         dgram_new,
 105         dgram_free,
 106         NULL,
 107         };
 108
 109 typedef struct bio_dgram_data_st
 110         {
 111         union {
 112                 struct sockaddr sa;
 113                 struct sockaddr_in sa_in;
 114 #if OPENSSL_USE_IPV6
 115                 struct sockaddr_in6 sa_in6;
 116 #endif
 117         } peer;
 118         unsigned int connected;
 119         unsigned int _errno;
 120         unsigned int mtu;
 121         struct timeval next_timeout;
 122         struct timeval socket_timeout;
 123         } bio_dgram_data;
 124
 125 BIO_METHOD *BIO_s_datagram(void)
 126         {
 127         return(&methods_dgramp);
 128         }
 129
 130 BIO *BIO_new_dgram(int fd, int close_flag)
 131         {
 132         BIO *ret;
 133
 134         ret=BIO_new(BIO_s_datagram());
 135         if (ret == NULL) return(NULL);
 136         BIO_set_fd(ret,fd,close_flag);
 137         return(ret);
 138         }
 139
 140 static int dgram_new(BIO *bi)
 141         {
 142         bio_dgram_data *data = NULL;
 143
 144         bi->init=0;
 145         bi->num=0;
 146         data = OPENSSL_malloc(sizeof(bio_dgram_data));
 147         if (data == NULL)
 148                 return 0;
 149         memset(data, 0x00, sizeof(bio_dgram_data));
 150     bi->ptr = data;
 151
 152         bi->flags=0;
 153         return(1);
 154         }
 155
 156 static int dgram_free(BIO *a)
 157         {
 158         bio_dgram_data *data;
 159
 160         if (a == NULL) return(0);
 161         if ( ! dgram_clear(a))
 162                 return 0;
 163
 164         data = (bio_dgram_data *)a->ptr;
 165         if(data != NULL) OPENSSL_free(data);
 166
 167         return(1);
 168         }
 169
 170 static int dgram_clear(BIO *a)
 171         {
 172         if (a == NULL) return(0);
 173         if (a->shutdown)
 174                 {
 175                 if (a->init)
 176                         {
 177                         SHUTDOWN2(a->num);
 178                         }
 179                 a->init=0;
 180                 a->flags=0;
 181                 }
 182         return(1);
 183         }
 184
 185 static void dgram_adjust_rcv_timeout(BIO *b)
 186         {
 187 #if defined(SO_RCVTIMEO)
 188         bio_dgram_data *data = (bio_dgram_data *)b->ptr;
 189         int sz = sizeof(int);
 190
 191         /* Is a timer active? */
 192         if (data->next_timeout.tv_sec > 0 || data->next_timeout.tv_usec > 0)
 193                 {
 194                 struct timeval timenow, timeleft;
 195
 196                 /* Read current socket timeout */
 197 #ifdef OPENSSL_SYS_WINDOWS
 198                 int timeout;
 199                 if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 200                                            (void*)&timeout, &sz) < 0)
 201                         { perror("getsockopt"); }
 202                 else
 203                         {
 204                         data->socket_timeout.tv_sec = timeout / 1000;
 205                         data->socket_timeout.tv_usec = (timeout % 1000) * 1000;
 206                         }
 207 #else
 208                 if ( getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 209                                                 &(data->socket_timeout), (void *)&sz) < 0)
 210                         { perror("getsockopt"); }
 211 #endif
 212
 213                 /* Get current time */
 214                 get_current_time(&timenow);
 215
 216                 /* Calculate time left until timer expires */
 217                 memcpy(&timeleft, &(data->next_timeout), sizeof(struct timeval));
 218                 timeleft.tv_sec -= timenow.tv_sec;
 219                 timeleft.tv_usec -= timenow.tv_usec;
 220                 if (timeleft.tv_usec < 0)
 221                         {
 222                         timeleft.tv_sec--;
 223                         timeleft.tv_usec += 1000000;
 224                         }
 225
 226                 if (timeleft.tv_sec < 0)
 227                         {
 228                         timeleft.tv_sec = 0;
 229                         timeleft.tv_usec = 1;
 230                         }
 231
 232                 /* Adjust socket timeout if next handhake message timer
 233                  * will expire earlier.
 234                  */
 235                 if ((data->socket_timeout.tv_sec == 0 && data->socket_timeout.tv_usec == 0) ||
 236                         (data->socket_timeout.tv_sec > timeleft.tv_sec) ||
 237                         (data->socket_timeout.tv_sec == timeleft.tv_sec &&
 238                          data->socket_timeout.tv_usec >= timeleft.tv_usec))
 239                         {
 240 #ifdef OPENSSL_SYS_WINDOWS
 241                         timeout = timeleft.tv_sec * 1000 + timeleft.tv_usec / 1000;
 242                         if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 243                                                    (void*)&timeout, sizeof(timeout)) < 0)
 244                                 { perror("setsockopt"); }
 245 #else
 246                         if ( setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, &timeleft,
 247                                                         sizeof(struct timeval)) < 0)
 248                                 { perror("setsockopt"); }
 249 #endif
 250                         }
 251                 }
 252 #endif
 253         }
 254
 255 static void dgram_reset_rcv_timeout(BIO *b)
 256         {
 257 #if defined(SO_RCVTIMEO)
 258         bio_dgram_data *data = (bio_dgram_data *)b->ptr;
 259
 260         /* Is a timer active? */
 261         if (data->next_timeout.tv_sec > 0 || data->next_timeout.tv_usec > 0)
 262                 {
 263 #ifdef OPENSSL_SYS_WINDOWS
 264                 int timeout = data->socket_timeout.tv_sec * 1000 +
 265                                           data->socket_timeout.tv_usec / 1000;
 266                 if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 267                                            (void*)&timeout, sizeof(timeout)) < 0)
 268                         { perror("setsockopt"); }
 269 #else
 270                 if ( setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, &(data->socket_timeout),
 271                                                 sizeof(struct timeval)) < 0)
 272                         { perror("setsockopt"); }
 273 #endif
 274                 }
 275 #endif
 276         }
 277
 278 static int dgram_read(BIO *b, char *out, int outl)
 279         {
 280         int ret=0;
 281         bio_dgram_data *data = (bio_dgram_data *)b->ptr;
 282
 283         struct  {
 284         /*
 285          * See commentary in b_sock.c. <appro>
 286          */
 287         union   { size_t s; int i; } len;
 288         union   {
 289                 struct sockaddr sa;
 290                 struct sockaddr_in sa_in;
 291 #if OPENSSL_USE_IPV6
 292                 struct sockaddr_in6 sa_in6;
 293 #endif
 294                 } peer;
 295         } sa;
 296
 297         sa.len.s=0;
 298         sa.len.i=sizeof(sa.peer);
 299
 300         if (out != NULL)
 301                 {
 302                 clear_socket_error();
 303                 memset(&sa.peer, 0x00, sizeof(sa.peer));
 304                 dgram_adjust_rcv_timeout(b);
 305                 ret=recvfrom(b->num,out,outl,0,&sa.peer.sa,(void *)&sa.len);
 306                 if (sizeof(sa.len.i)!=sizeof(sa.len.s) && sa.len.i==0)
 307                         {
 308                         OPENSSL_assert(sa.len.s<=sizeof(sa.peer));
 309                         sa.len.i = (int)sa.len.s;
 310                         }
 311                 dgram_reset_rcv_timeout(b);
 312
 313                 if ( ! data->connected  && ret >= 0)
 314                         BIO_ctrl(b, BIO_CTRL_DGRAM_SET_PEER, 0, &sa.peer);
 315
 316                 BIO_clear_retry_flags(b);
 317                 if (ret < 0)
 318                         {
 319                         if (BIO_dgram_should_retry(ret))
 320                                 {
 321                                 BIO_set_retry_read(b);
 322                                 data->_errno = get_last_socket_error();
 323                                 }
 324                         }
 325                 }
 326         return(ret);
 327         }
 328
 329 static int dgram_write(BIO *b, const char *in, int inl)
 330         {
 331         int ret;
 332         bio_dgram_data *data = (bio_dgram_data *)b->ptr;
 333         clear_socket_error();
 334
 335         if ( data->connected )
 336                 ret=writesocket(b->num,in,inl);
 337         else
 338 #if defined(NETWARE_CLIB) && defined(NETWARE_BSDSOCK)
 339                 ret=sendto(b->num, (char *)in, inl, 0, &data->peer.sa, sizeof(data->peer));
 340 #else
 341                 ret=sendto(b->num, in, inl, 0, &data->peer.sa, sizeof(data->peer));
 342 #endif
 343
 344         BIO_clear_retry_flags(b);
 345         if (ret <= 0)
 346                 {
 347                 if (BIO_dgram_should_retry(ret))
 348                         {
 349                         BIO_set_retry_write(b);
 350                         data->_errno = get_last_socket_error();
 351
 352 #if 0 /* higher layers are responsible for querying MTU, if necessary */
 353                         if ( data->_errno == EMSGSIZE)
 354                                 /* retrieve the new MTU */
 355                                 BIO_ctrl(b, BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
 356 #endif
 357                         }
 358                 }
 359         return(ret);
 360         }
 361
 362 static long dgram_ctrl(BIO *b, int cmd, long num, void *ptr)
 363         {
 364         long ret=1;
 365         int *ip;
 366         struct sockaddr *to = NULL;
 367         bio_dgram_data *data = NULL;
 368 #if defined(IP_MTU_DISCOVER) || defined(IP_MTU)
 369         long sockopt_val = 0;
 370         unsigned int sockopt_len = 0;
 371 #endif
 372 #ifdef OPENSSL_SYS_LINUX
 373         socklen_t addr_len;
 374         struct sockaddr_storage addr;
 375 #endif
 376
 377         data = (bio_dgram_data *)b->ptr;
 378
 379         switch (cmd)
 380                 {
 381         case BIO_CTRL_RESET:
 382                 num=0;
 383         case BIO_C_FILE_SEEK:
 384                 ret=0;
 385                 break;
 386         case BIO_C_FILE_TELL:
 387         case BIO_CTRL_INFO:
 388                 ret=0;
 389                 break;
 390         case BIO_C_SET_FD:
 391                 dgram_clear(b);
 392                 b->num= *((int *)ptr);
 393                 b->shutdown=(int)num;
 394                 b->init=1;
 395                 break;
 396         case BIO_C_GET_FD:
 397                 if (b->init)
 398                         {
 399                         ip=(int *)ptr;
 400                         if (ip != NULL) *ip=b->num;
 401                         ret=b->num;
 402                         }
 403                 else
 404                         ret= -1;
 405                 break;
 406         case BIO_CTRL_GET_CLOSE:
 407                 ret=b->shutdown;
 408                 break;
 409         case BIO_CTRL_SET_CLOSE:
 410                 b->shutdown=(int)num;
 411                 break;
 412         case BIO_CTRL_PENDING:
 413         case BIO_CTRL_WPENDING:
 414                 ret=0;
 415                 break;
 416         case BIO_CTRL_DUP:
 417         case BIO_CTRL_FLUSH:
 418                 ret=1;
 419                 break;
 420         case BIO_CTRL_DGRAM_CONNECT:
 421                 to = (struct sockaddr *)ptr;
 422 #if 0
 423                 if (connect(b->num, to, sizeof(struct sockaddr)) < 0)
 424                         { perror("connect"); ret = 0; }
 425                 else
 426                         {
 427 #endif
 428                         switch (to->sa_family)
 429                                 {
 430                                 case AF_INET:
 431                                         memcpy(&data->peer,to,sizeof(data->peer.sa_in));
 432                                         break;
 433 #if OPENSSL_USE_IPV6
 434                                 case AF_INET6:
 435                                         memcpy(&data->peer,to,sizeof(data->peer.sa_in6));
 436                                         break;
 437 #endif
 438                                 default:
 439                                         memcpy(&data->peer,to,sizeof(data->peer.sa));
 440                                         break;
 441                                 }
 442 #if 0
 443                         }
 444 #endif
 445                 break;
 446                 /* (Linux)kernel sets DF bit on outgoing IP packets */
 447         case BIO_CTRL_DGRAM_MTU_DISCOVER:
 448 #ifdef OPENSSL_SYS_LINUX
 449                 addr_len = (socklen_t)sizeof(struct sockaddr_storage);
 450                 memset((void *)&addr, 0, sizeof(struct sockaddr_storage));
 451                 if (getsockname(b->num, (void *)&addr, &addr_len) < 0)
 452                         {
 453                         ret = 0;
 454                         break;
 455                         }
 456                 sockopt_len = sizeof(sockopt_val);
 457                 switch (addr.ss_family)
 458                         {
 459                 case AF_INET:
 460                         sockopt_val = IP_PMTUDISC_DO;
 461                         if ((ret = setsockopt(b->num, IPPROTO_IP, IP_MTU_DISCOVER,
 462                                 &sockopt_val, sizeof(sockopt_val))) < 0)
 463                                 perror("setsockopt");
 464                         break;
 465 #if OPENSSL_USE_IPV6
 466                 case AF_INET6:
 467                         sockopt_val = IPV6_PMTUDISC_DO;
 468                         if ((ret = setsockopt(b->num, IPPROTO_IPV6, IPV6_MTU_DISCOVER,
 469                                 &sockopt_val, sizeof(sockopt_val))) < 0)
 470                                 perror("setsockopt");
 471                         break;
 472 #endif
 473                 default:
 474                         ret = -1;
 475                         break;
 476                         }
 477                 ret = -1;
 478 #else
 479                 break;
 480 #endif
 481         case BIO_CTRL_DGRAM_QUERY_MTU:
 482 #ifdef OPENSSL_SYS_LINUX
 483                 addr_len = (socklen_t)sizeof(struct sockaddr_storage);
 484                 memset((void *)&addr, 0, sizeof(struct sockaddr_storage));
 485                 if (getsockname(b->num, (void *)&addr, &addr_len) < 0)
 486                         {
 487                         ret = 0;
 488                         break;
 489                         }
 490                 sockopt_len = sizeof(sockopt_val);
 491                 switch (addr.ss_family)
 492                         {
 493                 case AF_INET:
 494                         if ((ret = getsockopt(b->num, IPPROTO_IP, IP_MTU, (void *)&sockopt_val,
 495                                 &sockopt_len)) < 0 || sockopt_val < 0)
 496                                 {
 497                                 ret = 0;
 498                                 }
 499                         else
 500                                 {
 501                                 /* we assume that the transport protocol is UDP and no
 502                                  * IP options are used.
 503                                  */
 504                                 data->mtu = sockopt_val - 8 - 20;
 505                                 ret = data->mtu;
 506                                 }
 507                         break;
 508 #if OPENSSL_USE_IPV6
 509                 case AF_INET6:
 510                         if ((ret = getsockopt(b->num, IPPROTO_IPV6, IPV6_MTU, (void *)&sockopt_val,
 511                                 &sockopt_len)) < 0 || sockopt_val < 0)
 512                                 {
 513                                 ret = 0;
 514                                 }
 515                         else
 516                                 {
 517                                 /* we assume that the transport protocol is UDP and no
 518                                  * IPV6 options are used.
 519                                  */
 520                                 data->mtu = sockopt_val - 8 - 40;
 521                                 ret = data->mtu;
 522                                 }
 523                         break;
 524 #endif
 525                 default:
 526                         ret = 0;
 527                         break;
 528                         }
 529 #else
 530                 ret = 0;
 531 #endif
 532                 break;
 533         case BIO_CTRL_DGRAM_GET_MTU:
 534                 return data->mtu;
 535                 break;
 536         case BIO_CTRL_DGRAM_SET_MTU:
 537                 data->mtu = num;
 538                 ret = num;
 539                 break;
 540         case BIO_CTRL_DGRAM_SET_CONNECTED:
 541                 to = (struct sockaddr *)ptr;
 542
 543                 if ( to != NULL)
 544                         {
 545                         data->connected = 1;
 546                         switch (to->sa_family)
 547                                 {
 548                                 case AF_INET:
 549                                         memcpy(&data->peer,to,sizeof(data->peer.sa_in));
 550                                         break;
 551 #if OPENSSL_USE_IPV6
 552                                 case AF_INET6:
 553                                         memcpy(&data->peer,to,sizeof(data->peer.sa_in6));
 554                                         break;
 555 #endif
 556                                 default:
 557                                         memcpy(&data->peer,to,sizeof(data->peer.sa));
 558                                         break;
 559                                 }
 560                         }
 561                 else
 562                         {
 563                         data->connected = 0;
 564                         memset(&(data->peer), 0x00, sizeof(data->peer));
 565                         }
 566                 break;
 567         case BIO_CTRL_DGRAM_GET_PEER:
 568                 to = (struct sockaddr *) ptr;
 569                 switch (to->sa_family)
 570                         {
 571                         case AF_INET:
 572                                 memcpy(to,&data->peer,(ret=sizeof(data->peer.sa_in)));
 573                                 break;
 574 #if OPENSSL_USE_IPV6
 575                         case AF_INET6:
 576                                 memcpy(to,&data->peer,(ret=sizeof(data->peer.sa_in6)));
 577                                 break;
 578 #endif
 579                         default:
 580                                 memcpy(to,&data->peer,(ret=sizeof(data->peer.sa)));
 581                                 break;
 582                         }
 583                 break;
 584         case BIO_CTRL_DGRAM_SET_PEER:
 585                 to = (struct sockaddr *) ptr;
 586                 switch (to->sa_family)
 587                         {
 588                         case AF_INET:
 589                                 memcpy(&data->peer,to,sizeof(data->peer.sa_in));
 590                                 break;
 591 #if OPENSSL_USE_IPV6
 592                         case AF_INET6:
 593                                 memcpy(&data->peer,to,sizeof(data->peer.sa_in6));
 594                                 break;
 595 #endif
 596                         default:
 597                                 memcpy(&data->peer,to,sizeof(data->peer.sa));
 598                                 break;
 599                         }
 600                 break;
 601         case BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT:
 602                 memcpy(&(data->next_timeout), ptr, sizeof(struct timeval));
 603                 break;
 604 #if defined(SO_RCVTIMEO)
 605         case BIO_CTRL_DGRAM_SET_RECV_TIMEOUT:
 606 #ifdef OPENSSL_SYS_WINDOWS
 607                 {
 608                 struct timeval *tv = (struct timeval *)ptr;
 609                 int timeout = tv->tv_sec * 1000 + tv->tv_usec/1000;
 610                 if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 611                         (void*)&timeout, sizeof(timeout)) < 0)
 612                         { perror("setsockopt"); ret = -1; }
 613                 }
 614 #else
 615                 if ( setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, ptr,
 616                         sizeof(struct timeval)) < 0)
 617                         { perror("setsockopt"); ret = -1; }
 618 #endif
 619                 break;
 620         case BIO_CTRL_DGRAM_GET_RECV_TIMEOUT:
 621 #ifdef OPENSSL_SYS_WINDOWS
 622                 {
 623                 int timeout, sz = sizeof(timeout);
 624                 struct timeval *tv = (struct timeval *)ptr;
 625                 if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 626                         (void*)&timeout, &sz) < 0)
 627                         { perror("getsockopt"); ret = -1; }
 628                 else
 629                         {
 630                         tv->tv_sec = timeout / 1000;
 631                         tv->tv_usec = (timeout % 1000) * 1000;
 632                         ret = sizeof(*tv);
 633                         }
 634                 }
 635 #else
 636                 if ( getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 637                         ptr, (void *)&ret) < 0)
 638                         { perror("getsockopt"); ret = -1; }
 639 #endif
 640                 break;
 641 #endif
 642 #if defined(SO_SNDTIMEO)
 643         case BIO_CTRL_DGRAM_SET_SEND_TIMEOUT:
 644 #ifdef OPENSSL_SYS_WINDOWS
 645                 {
 646                 struct timeval *tv = (struct timeval *)ptr;
 647                 int timeout = tv->tv_sec * 1000 + tv->tv_usec/1000;
 648                 if (setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
 649                         (void*)&timeout, sizeof(timeout)) < 0)
 650                         { perror("setsockopt"); ret = -1; }
 651                 }
 652 #else
 653                 if ( setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO, ptr,
 654                         sizeof(struct timeval)) < 0)
 655                         { perror("setsockopt"); ret = -1; }
 656 #endif
 657                 break;
 658         case BIO_CTRL_DGRAM_GET_SEND_TIMEOUT:
 659 #ifdef OPENSSL_SYS_WINDOWS
 660                 {
 661                 int timeout, sz = sizeof(timeout);
 662                 struct timeval *tv = (struct timeval *)ptr;
 663                 if (getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
 664                         (void*)&timeout, &sz) < 0)
 665                         { perror("getsockopt"); ret = -1; }
 666                 else
 667                         {
 668                         tv->tv_sec = timeout / 1000;
 669                         tv->tv_usec = (timeout % 1000) * 1000;
 670                         ret = sizeof(*tv);
 671                         }
 672                 }
 673 #else
 674                 if ( getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
 675                         ptr, (void *)&ret) < 0)
 676                         { perror("getsockopt"); ret = -1; }
 677 #endif
 678                 break;
 679 #endif
 680         case BIO_CTRL_DGRAM_GET_SEND_TIMER_EXP:
 681                 /* fall-through */
 682         case BIO_CTRL_DGRAM_GET_RECV_TIMER_EXP:
 683 #ifdef OPENSSL_SYS_WINDOWS
 684                 if ( data->_errno == WSAETIMEDOUT)
 685 #else
 686                 if ( data->_errno == EAGAIN)
 687 #endif
 688                         {
 689                         ret = 1;
 690                         data->_errno = 0;
 691                         }
 692                 else
 693                         ret = 0;
 694                 break;
 695 #ifdef EMSGSIZE
 696         case BIO_CTRL_DGRAM_MTU_EXCEEDED:
 697                 if ( data->_errno == EMSGSIZE)
 698                         {
 699                         ret = 1;
 700                         data->_errno = 0;
 701                         }
 702                 else
 703                         ret = 0;
 704                 break;
 705 #endif
 706         default:
 707                 ret=0;
 708                 break;
 709                 }
 710         return(ret);
 711         }
 712
 713 static int dgram_puts(BIO *bp, const char *str)
 714         {
 715         int n,ret;
 716
 717         n=strlen(str);
 718         ret=dgram_write(bp,str,n);
 719         return(ret);
 720         }
 721
 722 static int BIO_dgram_should_retry(int i)
 723         {
 724         int err;
 725
 726         if ((i == 0) || (i == -1))
 727                 {
 728                 err=get_last_socket_error();
 729
 730 #if defined(OPENSSL_SYS_WINDOWS) && 0 /* more microsoft stupidity? perhaps not? Ben 4/1/99 */
 731                 if ((i == -1) && (err == 0))
 732                         return(1);
 733 #endif
 734
 735                 return(BIO_dgram_non_fatal_error(err));
 736                 }
 737         return(0);
 738         }
 739
 740 int BIO_dgram_non_fatal_error(int err)
 741         {
 742         switch (err)
 743                 {
 744 #if defined(OPENSSL_SYS_WINDOWS)
 745 # if defined(WSAEWOULDBLOCK)
 746         case WSAEWOULDBLOCK:
 747 # endif
 748
 749 # if 0 /* This appears to always be an error */
 750 #  if defined(WSAENOTCONN)
 751         case WSAENOTCONN:
 752 #  endif
 753 # endif
 754 #endif
 755
 756 #ifdef EWOULDBLOCK
 757 # ifdef WSAEWOULDBLOCK
 758 #  if WSAEWOULDBLOCK != EWOULDBLOCK
 759         case EWOULDBLOCK:
 760 #  endif
 761 # else
 762         case EWOULDBLOCK:
 763 # endif
 764 #endif
 765
 766 #ifdef EINTR
 767         case EINTR:
 768 #endif
 769
 770 #ifdef EAGAIN
 771 #if EWOULDBLOCK != EAGAIN
 772         case EAGAIN:
 773 # endif
 774 #endif
 775
 776 #ifdef EPROTO
 777         case EPROTO:
 778 #endif
 779
 780 #ifdef EINPROGRESS
 781         case EINPROGRESS:
 782 #endif
 783
 784 #ifdef EALREADY
 785         case EALREADY:
 786 #endif
 787
 788                 return(1);
 789                 /* break; */
 790         default:
 791                 break;
 792                 }
 793         return(0);
 794         }
 795 #endif
 796
 797 static void get_current_time(struct timeval *t)
 798         {
 799 #ifdef OPENSSL_SYS_WIN32
 800         struct _timeb tb;
 801         _ftime(&tb);
 802         t->tv_sec = (long)tb.time;
 803         t->tv_usec = (long)tb.millitm * 1000;
 804 #elif defined(OPENSSL_SYS_VMS)
 805         struct timeb tb;
 806         ftime(&tb);
 807         t->tv_sec = (long)tb.time;
 808         t->tv_usec = (long)tb.millitm * 1000;
 809 #else
 810         gettimeofday(t, NULL);
 811 #endif
 812         }