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                 {
 339                 int peerlen = sizeof(data->peer);
 340
 341                 if (data->peer.sa.sa_family == AF_INET)
 342                         peerlen = sizeof(data->peer.sa_in);
 343 #if OPENSSL_USE_IPV6
 344                 else if (data->peer.sa.sa_family == AF_INET6)
 345                         peerlen = sizeof(data->peer.sa_in6);
 346 #endif
 347 #if defined(NETWARE_CLIB) && defined(NETWARE_BSDSOCK)
 348                 ret=sendto(b->num, (char *)in, inl, 0, &data->peer.sa, peerlen);
 349 #else
 350                 ret=sendto(b->num, in, inl, 0, &data->peer.sa, peerlen);
 351 #endif
 352                 }
 353
 354         BIO_clear_retry_flags(b);
 355         if (ret <= 0)
 356                 {
 357                 if (BIO_dgram_should_retry(ret))
 358                         {
 359                         BIO_set_retry_write(b);
 360                         data->_errno = get_last_socket_error();
 361
 362 #if 0 /* higher layers are responsible for querying MTU, if necessary */
 363                         if ( data->_errno == EMSGSIZE)
 364                                 /* retrieve the new MTU */
 365                                 BIO_ctrl(b, BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
 366 #endif
 367                         }
 368                 }
 369         return(ret);
 370         }
 371
 372 static long dgram_ctrl(BIO *b, int cmd, long num, void *ptr)
 373         {
 374         long ret=1;
 375         int *ip;
 376         struct sockaddr *to = NULL;
 377         bio_dgram_data *data = NULL;
 378 #if defined(IP_MTU_DISCOVER) || defined(IP_MTU)
 379         long sockopt_val = 0;
 380         unsigned int sockopt_len = 0;
 381 #endif
 382 #ifdef OPENSSL_SYS_LINUX
 383         socklen_t addr_len;
 384         union   {
 385                 struct sockaddr sa;
 386                 struct sockaddr_in s4;
 387 #if OPENSSL_USE_IPV6
 388                 struct sockaddr_in6 s6;
 389 #endif
 390                 } addr;
 391 #endif
 392
 393         data = (bio_dgram_data *)b->ptr;
 394
 395         switch (cmd)
 396                 {
 397         case BIO_CTRL_RESET:
 398                 num=0;
 399         case BIO_C_FILE_SEEK:
 400                 ret=0;
 401                 break;
 402         case BIO_C_FILE_TELL:
 403         case BIO_CTRL_INFO:
 404                 ret=0;
 405                 break;
 406         case BIO_C_SET_FD:
 407                 dgram_clear(b);
 408                 b->num= *((int *)ptr);
 409                 b->shutdown=(int)num;
 410                 b->init=1;
 411                 break;
 412         case BIO_C_GET_FD:
 413                 if (b->init)
 414                         {
 415                         ip=(int *)ptr;
 416                         if (ip != NULL) *ip=b->num;
 417                         ret=b->num;
 418                         }
 419                 else
 420                         ret= -1;
 421                 break;
 422         case BIO_CTRL_GET_CLOSE:
 423                 ret=b->shutdown;
 424                 break;
 425         case BIO_CTRL_SET_CLOSE:
 426                 b->shutdown=(int)num;
 427                 break;
 428         case BIO_CTRL_PENDING:
 429         case BIO_CTRL_WPENDING:
 430                 ret=0;
 431                 break;
 432         case BIO_CTRL_DUP:
 433         case BIO_CTRL_FLUSH:
 434                 ret=1;
 435                 break;
 436         case BIO_CTRL_DGRAM_CONNECT:
 437                 to = (struct sockaddr *)ptr;
 438 #if 0
 439                 if (connect(b->num, to, sizeof(struct sockaddr)) < 0)
 440                         { perror("connect"); ret = 0; }
 441                 else
 442                         {
 443 #endif
 444                         switch (to->sa_family)
 445                                 {
 446                                 case AF_INET:
 447                                         memcpy(&data->peer,to,sizeof(data->peer.sa_in));
 448                                         break;
 449 #if OPENSSL_USE_IPV6
 450                                 case AF_INET6:
 451                                         memcpy(&data->peer,to,sizeof(data->peer.sa_in6));
 452                                         break;
 453 #endif
 454                                 default:
 455                                         memcpy(&data->peer,to,sizeof(data->peer.sa));
 456                                         break;
 457                                 }
 458 #if 0
 459                         }
 460 #endif
 461                 break;
 462                 /* (Linux)kernel sets DF bit on outgoing IP packets */
 463         case BIO_CTRL_DGRAM_MTU_DISCOVER:
 464 #ifdef OPENSSL_SYS_LINUX
 465                 addr_len = (socklen_t)sizeof(addr);
 466                 memset((void *)&addr, 0, sizeof(addr));
 467                 if (getsockname(b->num, &addr.sa, &addr_len) < 0)
 468                         {
 469                         ret = 0;
 470                         break;
 471                         }
 472                 sockopt_len = sizeof(sockopt_val);
 473                 switch (addr.sa.sa_family)
 474                         {
 475                 case AF_INET:
 476                         sockopt_val = IP_PMTUDISC_DO;
 477                         if ((ret = setsockopt(b->num, IPPROTO_IP, IP_MTU_DISCOVER,
 478                                 &sockopt_val, sizeof(sockopt_val))) < 0)
 479                                 perror("setsockopt");
 480                         break;
 481 #if OPENSSL_USE_IPV6 && defined(IPV6_MTU_DISCOVER)
 482                 case AF_INET6:
 483                         sockopt_val = IPV6_PMTUDISC_DO;
 484                         if ((ret = setsockopt(b->num, IPPROTO_IPV6, IPV6_MTU_DISCOVER,
 485                                 &sockopt_val, sizeof(sockopt_val))) < 0)
 486                                 perror("setsockopt");
 487                         break;
 488 #endif
 489                 default:
 490                         ret = -1;
 491                         break;
 492                         }
 493                 ret = -1;
 494 #else
 495                 break;
 496 #endif
 497         case BIO_CTRL_DGRAM_QUERY_MTU:
 498 #ifdef OPENSSL_SYS_LINUX
 499                 addr_len = (socklen_t)sizeof(addr);
 500                 memset((void *)&addr, 0, sizeof(addr));
 501                 if (getsockname(b->num, &addr.sa, &addr_len) < 0)
 502                         {
 503                         ret = 0;
 504                         break;
 505                         }
 506                 sockopt_len = sizeof(sockopt_val);
 507                 switch (addr.sa.sa_family)
 508                         {
 509                 case AF_INET:
 510                         if ((ret = getsockopt(b->num, IPPROTO_IP, IP_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                                  * IP options are used.
 519                                  */
 520                                 data->mtu = sockopt_val - 8 - 20;
 521                                 ret = data->mtu;
 522                                 }
 523                         break;
 524 #if OPENSSL_USE_IPV6 && defined(IPV6_MTU)
 525                 case AF_INET6:
 526                         if ((ret = getsockopt(b->num, IPPROTO_IPV6, IPV6_MTU, (void *)&sockopt_val,
 527                                 &sockopt_len)) < 0 || sockopt_val < 0)
 528                                 {
 529                                 ret = 0;
 530                                 }
 531                         else
 532                                 {
 533                                 /* we assume that the transport protocol is UDP and no
 534                                  * IPV6 options are used.
 535                                  */
 536                                 data->mtu = sockopt_val - 8 - 40;
 537                                 ret = data->mtu;
 538                                 }
 539                         break;
 540 #endif
 541                 default:
 542                         ret = 0;
 543                         break;
 544                         }
 545 #else
 546                 ret = 0;
 547 #endif
 548                 break;
 549         case BIO_CTRL_DGRAM_GET_MTU:
 550                 return data->mtu;
 551                 break;
 552         case BIO_CTRL_DGRAM_SET_MTU:
 553                 data->mtu = num;
 554                 ret = num;
 555                 break;
 556         case BIO_CTRL_DGRAM_SET_CONNECTED:
 557                 to = (struct sockaddr *)ptr;
 558
 559                 if ( to != NULL)
 560                         {
 561                         data->connected = 1;
 562                         switch (to->sa_family)
 563                                 {
 564                                 case AF_INET:
 565                                         memcpy(&data->peer,to,sizeof(data->peer.sa_in));
 566                                         break;
 567 #if OPENSSL_USE_IPV6
 568                                 case AF_INET6:
 569                                         memcpy(&data->peer,to,sizeof(data->peer.sa_in6));
 570                                         break;
 571 #endif
 572                                 default:
 573                                         memcpy(&data->peer,to,sizeof(data->peer.sa));
 574                                         break;
 575                                 }
 576                         }
 577                 else
 578                         {
 579                         data->connected = 0;
 580                         memset(&(data->peer), 0x00, sizeof(data->peer));
 581                         }
 582                 break;
 583         case BIO_CTRL_DGRAM_GET_PEER:
 584                 switch (data->peer.sa.sa_family)
 585                         {
 586                         case AF_INET:
 587                                 ret=sizeof(data->peer.sa_in);
 588                                 break;
 589 #if OPENSSL_USE_IPV6
 590                         case AF_INET6:
 591                                 ret=sizeof(data->peer.sa_in6);
 592                                 break;
 593 #endif
 594                         default:
 595                                 ret=sizeof(data->peer.sa);
 596                                 break;
 597                         }
 598                 if (num==0 || num>ret)
 599                         num=ret;
 600                 memcpy(ptr,&data->peer,(ret=num));
 601                 break;
 602         case BIO_CTRL_DGRAM_SET_PEER:
 603                 to = (struct sockaddr *) ptr;
 604                 switch (to->sa_family)
 605                         {
 606                         case AF_INET:
 607                                 memcpy(&data->peer,to,sizeof(data->peer.sa_in));
 608                                 break;
 609 #if OPENSSL_USE_IPV6
 610                         case AF_INET6:
 611                                 memcpy(&data->peer,to,sizeof(data->peer.sa_in6));
 612                                 break;
 613 #endif
 614                         default:
 615                                 memcpy(&data->peer,to,sizeof(data->peer.sa));
 616                                 break;
 617                         }
 618                 break;
 619         case BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT:
 620                 memcpy(&(data->next_timeout), ptr, sizeof(struct timeval));
 621                 break;
 622 #if defined(SO_RCVTIMEO)
 623         case BIO_CTRL_DGRAM_SET_RECV_TIMEOUT:
 624 #ifdef OPENSSL_SYS_WINDOWS
 625                 {
 626                 struct timeval *tv = (struct timeval *)ptr;
 627                 int timeout = tv->tv_sec * 1000 + tv->tv_usec/1000;
 628                 if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 629                         (void*)&timeout, sizeof(timeout)) < 0)
 630                         { perror("setsockopt"); ret = -1; }
 631                 }
 632 #else
 633                 if ( setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, ptr,
 634                         sizeof(struct timeval)) < 0)
 635                         { perror("setsockopt"); ret = -1; }
 636 #endif
 637                 break;
 638         case BIO_CTRL_DGRAM_GET_RECV_TIMEOUT:
 639 #ifdef OPENSSL_SYS_WINDOWS
 640                 {
 641                 int timeout, sz = sizeof(timeout);
 642                 struct timeval *tv = (struct timeval *)ptr;
 643                 if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 644                         (void*)&timeout, &sz) < 0)
 645                         { perror("getsockopt"); ret = -1; }
 646                 else
 647                         {
 648                         tv->tv_sec = timeout / 1000;
 649                         tv->tv_usec = (timeout % 1000) * 1000;
 650                         ret = sizeof(*tv);
 651                         }
 652                 }
 653 #else
 654                 if ( getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 655                         ptr, (void *)&ret) < 0)
 656                         { perror("getsockopt"); ret = -1; }
 657 #endif
 658                 break;
 659 #endif
 660 #if defined(SO_SNDTIMEO)
 661         case BIO_CTRL_DGRAM_SET_SEND_TIMEOUT:
 662 #ifdef OPENSSL_SYS_WINDOWS
 663                 {
 664                 struct timeval *tv = (struct timeval *)ptr;
 665                 int timeout = tv->tv_sec * 1000 + tv->tv_usec/1000;
 666                 if (setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
 667                         (void*)&timeout, sizeof(timeout)) < 0)
 668                         { perror("setsockopt"); ret = -1; }
 669                 }
 670 #else
 671                 if ( setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO, ptr,
 672                         sizeof(struct timeval)) < 0)
 673                         { perror("setsockopt"); ret = -1; }
 674 #endif
 675                 break;
 676         case BIO_CTRL_DGRAM_GET_SEND_TIMEOUT:
 677 #ifdef OPENSSL_SYS_WINDOWS
 678                 {
 679                 int timeout, sz = sizeof(timeout);
 680                 struct timeval *tv = (struct timeval *)ptr;
 681                 if (getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
 682                         (void*)&timeout, &sz) < 0)
 683                         { perror("getsockopt"); ret = -1; }
 684                 else
 685                         {
 686                         tv->tv_sec = timeout / 1000;
 687                         tv->tv_usec = (timeout % 1000) * 1000;
 688                         ret = sizeof(*tv);
 689                         }
 690                 }
 691 #else
 692                 if ( getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
 693                         ptr, (void *)&ret) < 0)
 694                         { perror("getsockopt"); ret = -1; }
 695 #endif
 696                 break;
 697 #endif
 698         case BIO_CTRL_DGRAM_GET_SEND_TIMER_EXP:
 699                 /* fall-through */
 700         case BIO_CTRL_DGRAM_GET_RECV_TIMER_EXP:
 701 #ifdef OPENSSL_SYS_WINDOWS
 702                 if ( data->_errno == WSAETIMEDOUT)
 703 #else
 704                 if ( data->_errno == EAGAIN)
 705 #endif
 706                         {
 707                         ret = 1;
 708                         data->_errno = 0;
 709                         }
 710                 else
 711                         ret = 0;
 712                 break;
 713 #ifdef EMSGSIZE
 714         case BIO_CTRL_DGRAM_MTU_EXCEEDED:
 715                 if ( data->_errno == EMSGSIZE)
 716                         {
 717                         ret = 1;
 718                         data->_errno = 0;
 719                         }
 720                 else
 721                         ret = 0;
 722                 break;
 723 #endif
 724         default:
 725                 ret=0;
 726                 break;
 727                 }
 728         return(ret);
 729         }
 730
 731 static int dgram_puts(BIO *bp, const char *str)
 732         {
 733         int n,ret;
 734
 735         n=strlen(str);
 736         ret=dgram_write(bp,str,n);
 737         return(ret);
 738         }
 739
 740 static int BIO_dgram_should_retry(int i)
 741         {
 742         int err;
 743
 744         if ((i == 0) || (i == -1))
 745                 {
 746                 err=get_last_socket_error();
 747
 748 #if defined(OPENSSL_SYS_WINDOWS) && 0 /* more microsoft stupidity? perhaps not? Ben 4/1/99 */
 749                 if ((i == -1) && (err == 0))
 750                         return(1);
 751 #endif
 752
 753                 return(BIO_dgram_non_fatal_error(err));
 754                 }
 755         return(0);
 756         }
 757
 758 int BIO_dgram_non_fatal_error(int err)
 759         {
 760         switch (err)
 761                 {
 762 #if defined(OPENSSL_SYS_WINDOWS)
 763 # if defined(WSAEWOULDBLOCK)
 764         case WSAEWOULDBLOCK:
 765 # endif
 766
 767 # if 0 /* This appears to always be an error */
 768 #  if defined(WSAENOTCONN)
 769         case WSAENOTCONN:
 770 #  endif
 771 # endif
 772 #endif
 773
 774 #ifdef EWOULDBLOCK
 775 # ifdef WSAEWOULDBLOCK
 776 #  if WSAEWOULDBLOCK != EWOULDBLOCK
 777         case EWOULDBLOCK:
 778 #  endif
 779 # else
 780         case EWOULDBLOCK:
 781 # endif
 782 #endif
 783
 784 #ifdef EINTR
 785         case EINTR:
 786 #endif
 787
 788 #ifdef EAGAIN
 789 #if EWOULDBLOCK != EAGAIN
 790         case EAGAIN:
 791 # endif
 792 #endif
 793
 794 #ifdef EPROTO
 795         case EPROTO:
 796 #endif
 797
 798 #ifdef EINPROGRESS
 799         case EINPROGRESS:
 800 #endif
 801
 802 #ifdef EALREADY
 803         case EALREADY:
 804 #endif
 805
 806                 return(1);
 807                 /* break; */
 808         default:
 809                 break;
 810                 }
 811         return(0);
 812         }
 813 #endif
 814
 815 static void get_current_time(struct timeval *t)
 816         {
 817 #ifdef OPENSSL_SYS_WIN32
 818         struct _timeb tb;
 819         _ftime(&tb);
 820         t->tv_sec = (long)tb.time;
 821         t->tv_usec = (long)tb.millitm * 1000;
 822 #elif defined(OPENSSL_SYS_VMS)
 823         struct timeb tb;
 824         ftime(&tb);
 825         t->tv_sec = (long)tb.time;
 826         t->tv_usec = (long)tb.millitm * 1000;
 827 #else
 828         gettimeofday(t, NULL);
 829 #endif
 830         }