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         union   {
 375                 struct sockaddr sa;
 376                 struct sockaddr_in s4;
 377 #if OPENSSL_USE_IPV6
 378                 struct sockaddr_in6 s6;
 379 #endif
 380                 } addr;
 381 #endif
 382
 383         data = (bio_dgram_data *)b->ptr;
 384
 385         switch (cmd)
 386                 {
 387         case BIO_CTRL_RESET:
 388                 num=0;
 389         case BIO_C_FILE_SEEK:
 390                 ret=0;
 391                 break;
 392         case BIO_C_FILE_TELL:
 393         case BIO_CTRL_INFO:
 394                 ret=0;
 395                 break;
 396         case BIO_C_SET_FD:
 397                 dgram_clear(b);
 398                 b->num= *((int *)ptr);
 399                 b->shutdown=(int)num;
 400                 b->init=1;
 401                 break;
 402         case BIO_C_GET_FD:
 403                 if (b->init)
 404                         {
 405                         ip=(int *)ptr;
 406                         if (ip != NULL) *ip=b->num;
 407                         ret=b->num;
 408                         }
 409                 else
 410                         ret= -1;
 411                 break;
 412         case BIO_CTRL_GET_CLOSE:
 413                 ret=b->shutdown;
 414                 break;
 415         case BIO_CTRL_SET_CLOSE:
 416                 b->shutdown=(int)num;
 417                 break;
 418         case BIO_CTRL_PENDING:
 419         case BIO_CTRL_WPENDING:
 420                 ret=0;
 421                 break;
 422         case BIO_CTRL_DUP:
 423         case BIO_CTRL_FLUSH:
 424                 ret=1;
 425                 break;
 426         case BIO_CTRL_DGRAM_CONNECT:
 427                 to = (struct sockaddr *)ptr;
 428 #if 0
 429                 if (connect(b->num, to, sizeof(struct sockaddr)) < 0)
 430                         { perror("connect"); ret = 0; }
 431                 else
 432                         {
 433 #endif
 434                         switch (to->sa_family)
 435                                 {
 436                                 case AF_INET:
 437                                         memcpy(&data->peer,to,sizeof(data->peer.sa_in));
 438                                         break;
 439 #if OPENSSL_USE_IPV6
 440                                 case AF_INET6:
 441                                         memcpy(&data->peer,to,sizeof(data->peer.sa_in6));
 442                                         break;
 443 #endif
 444                                 default:
 445                                         memcpy(&data->peer,to,sizeof(data->peer.sa));
 446                                         break;
 447                                 }
 448 #if 0
 449                         }
 450 #endif
 451                 break;
 452                 /* (Linux)kernel sets DF bit on outgoing IP packets */
 453         case BIO_CTRL_DGRAM_MTU_DISCOVER:
 454 #ifdef OPENSSL_SYS_LINUX
 455                 addr_len = (socklen_t)sizeof(addr);
 456                 memset((void *)&addr, 0, sizeof(addr));
 457                 if (getsockname(b->num, &addr.sa, &addr_len) < 0)
 458                         {
 459                         ret = 0;
 460                         break;
 461                         }
 462                 sockopt_len = sizeof(sockopt_val);
 463                 switch (addr.sa.sa_family)
 464                         {
 465                 case AF_INET:
 466                         sockopt_val = IP_PMTUDISC_DO;
 467                         if ((ret = setsockopt(b->num, IPPROTO_IP, IP_MTU_DISCOVER,
 468                                 &sockopt_val, sizeof(sockopt_val))) < 0)
 469                                 perror("setsockopt");
 470                         break;
 471 #if OPENSSL_USE_IPV6 && defined(IPV6_MTU_DISCOVER)
 472                 case AF_INET6:
 473                         sockopt_val = IPV6_PMTUDISC_DO;
 474                         if ((ret = setsockopt(b->num, IPPROTO_IPV6, IPV6_MTU_DISCOVER,
 475                                 &sockopt_val, sizeof(sockopt_val))) < 0)
 476                                 perror("setsockopt");
 477                         break;
 478 #endif
 479                 default:
 480                         ret = -1;
 481                         break;
 482                         }
 483                 ret = -1;
 484 #else
 485                 break;
 486 #endif
 487         case BIO_CTRL_DGRAM_QUERY_MTU:
 488 #ifdef OPENSSL_SYS_LINUX
 489                 addr_len = (socklen_t)sizeof(addr);
 490                 memset((void *)&addr, 0, sizeof(addr));
 491                 if (getsockname(b->num, &addr.sa, &addr_len) < 0)
 492                         {
 493                         ret = 0;
 494                         break;
 495                         }
 496                 sockopt_len = sizeof(sockopt_val);
 497                 switch (addr.sa.sa_family)
 498                         {
 499                 case AF_INET:
 500                         if ((ret = getsockopt(b->num, IPPROTO_IP, IP_MTU, (void *)&sockopt_val,
 501                                 &sockopt_len)) < 0 || sockopt_val < 0)
 502                                 {
 503                                 ret = 0;
 504                                 }
 505                         else
 506                                 {
 507                                 /* we assume that the transport protocol is UDP and no
 508                                  * IP options are used.
 509                                  */
 510                                 data->mtu = sockopt_val - 8 - 20;
 511                                 ret = data->mtu;
 512                                 }
 513                         break;
 514 #if OPENSSL_USE_IPV6 && defined(IPV6_MTU)
 515                 case AF_INET6:
 516                         if ((ret = getsockopt(b->num, IPPROTO_IPV6, IPV6_MTU, (void *)&sockopt_val,
 517                                 &sockopt_len)) < 0 || sockopt_val < 0)
 518                                 {
 519                                 ret = 0;
 520                                 }
 521                         else
 522                                 {
 523                                 /* we assume that the transport protocol is UDP and no
 524                                  * IPV6 options are used.
 525                                  */
 526                                 data->mtu = sockopt_val - 8 - 40;
 527                                 ret = data->mtu;
 528                                 }
 529                         break;
 530 #endif
 531                 default:
 532                         ret = 0;
 533                         break;
 534                         }
 535 #else
 536                 ret = 0;
 537 #endif
 538                 break;
 539         case BIO_CTRL_DGRAM_GET_MTU:
 540                 return data->mtu;
 541                 break;
 542         case BIO_CTRL_DGRAM_SET_MTU:
 543                 data->mtu = num;
 544                 ret = num;
 545                 break;
 546         case BIO_CTRL_DGRAM_SET_CONNECTED:
 547                 to = (struct sockaddr *)ptr;
 548
 549                 if ( to != NULL)
 550                         {
 551                         data->connected = 1;
 552                         switch (to->sa_family)
 553                                 {
 554                                 case AF_INET:
 555                                         memcpy(&data->peer,to,sizeof(data->peer.sa_in));
 556                                         break;
 557 #if OPENSSL_USE_IPV6
 558                                 case AF_INET6:
 559                                         memcpy(&data->peer,to,sizeof(data->peer.sa_in6));
 560                                         break;
 561 #endif
 562                                 default:
 563                                         memcpy(&data->peer,to,sizeof(data->peer.sa));
 564                                         break;
 565                                 }
 566                         }
 567                 else
 568                         {
 569                         data->connected = 0;
 570                         memset(&(data->peer), 0x00, sizeof(data->peer));
 571                         }
 572                 break;
 573         case BIO_CTRL_DGRAM_GET_PEER:
 574                 switch (data->peer.sa.sa_family)
 575                         {
 576                         case AF_INET:
 577                                 ret=sizeof(data->peer.sa_in);
 578                                 break;
 579 #if OPENSSL_USE_IPV6
 580                         case AF_INET6:
 581                                 ret=sizeof(data->peer.sa_in6);
 582                                 break;
 583 #endif
 584                         default:
 585                                 ret=sizeof(data->peer.sa);
 586                                 break;
 587                         }
 588                 if (num==0 || num>ret)
 589                         num=ret;
 590                 memcpy(ptr,&data->peer,(ret=num));
 591                 break;
 592         case BIO_CTRL_DGRAM_SET_PEER:
 593                 to = (struct sockaddr *) ptr;
 594                 switch (to->sa_family)
 595                         {
 596                         case AF_INET:
 597                                 memcpy(&data->peer,to,sizeof(data->peer.sa_in));
 598                                 break;
 599 #if OPENSSL_USE_IPV6
 600                         case AF_INET6:
 601                                 memcpy(&data->peer,to,sizeof(data->peer.sa_in6));
 602                                 break;
 603 #endif
 604                         default:
 605                                 memcpy(&data->peer,to,sizeof(data->peer.sa));
 606                                 break;
 607                         }
 608                 break;
 609         case BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT:
 610                 memcpy(&(data->next_timeout), ptr, sizeof(struct timeval));
 611                 break;
 612 #if defined(SO_RCVTIMEO)
 613         case BIO_CTRL_DGRAM_SET_RECV_TIMEOUT:
 614 #ifdef OPENSSL_SYS_WINDOWS
 615                 {
 616                 struct timeval *tv = (struct timeval *)ptr;
 617                 int timeout = tv->tv_sec * 1000 + tv->tv_usec/1000;
 618                 if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 619                         (void*)&timeout, sizeof(timeout)) < 0)
 620                         { perror("setsockopt"); ret = -1; }
 621                 }
 622 #else
 623                 if ( setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, ptr,
 624                         sizeof(struct timeval)) < 0)
 625                         { perror("setsockopt"); ret = -1; }
 626 #endif
 627                 break;
 628         case BIO_CTRL_DGRAM_GET_RECV_TIMEOUT:
 629 #ifdef OPENSSL_SYS_WINDOWS
 630                 {
 631                 int timeout, sz = sizeof(timeout);
 632                 struct timeval *tv = (struct timeval *)ptr;
 633                 if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 634                         (void*)&timeout, &sz) < 0)
 635                         { perror("getsockopt"); ret = -1; }
 636                 else
 637                         {
 638                         tv->tv_sec = timeout / 1000;
 639                         tv->tv_usec = (timeout % 1000) * 1000;
 640                         ret = sizeof(*tv);
 641                         }
 642                 }
 643 #else
 644                 if ( getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 645                         ptr, (void *)&ret) < 0)
 646                         { perror("getsockopt"); ret = -1; }
 647 #endif
 648                 break;
 649 #endif
 650 #if defined(SO_SNDTIMEO)
 651         case BIO_CTRL_DGRAM_SET_SEND_TIMEOUT:
 652 #ifdef OPENSSL_SYS_WINDOWS
 653                 {
 654                 struct timeval *tv = (struct timeval *)ptr;
 655                 int timeout = tv->tv_sec * 1000 + tv->tv_usec/1000;
 656                 if (setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
 657                         (void*)&timeout, sizeof(timeout)) < 0)
 658                         { perror("setsockopt"); ret = -1; }
 659                 }
 660 #else
 661                 if ( setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO, ptr,
 662                         sizeof(struct timeval)) < 0)
 663                         { perror("setsockopt"); ret = -1; }
 664 #endif
 665                 break;
 666         case BIO_CTRL_DGRAM_GET_SEND_TIMEOUT:
 667 #ifdef OPENSSL_SYS_WINDOWS
 668                 {
 669                 int timeout, sz = sizeof(timeout);
 670                 struct timeval *tv = (struct timeval *)ptr;
 671                 if (getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
 672                         (void*)&timeout, &sz) < 0)
 673                         { perror("getsockopt"); ret = -1; }
 674                 else
 675                         {
 676                         tv->tv_sec = timeout / 1000;
 677                         tv->tv_usec = (timeout % 1000) * 1000;
 678                         ret = sizeof(*tv);
 679                         }
 680                 }
 681 #else
 682                 if ( getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
 683                         ptr, (void *)&ret) < 0)
 684                         { perror("getsockopt"); ret = -1; }
 685 #endif
 686                 break;
 687 #endif
 688         case BIO_CTRL_DGRAM_GET_SEND_TIMER_EXP:
 689                 /* fall-through */
 690         case BIO_CTRL_DGRAM_GET_RECV_TIMER_EXP:
 691 #ifdef OPENSSL_SYS_WINDOWS
 692                 if ( data->_errno == WSAETIMEDOUT)
 693 #else
 694                 if ( data->_errno == EAGAIN)
 695 #endif
 696                         {
 697                         ret = 1;
 698                         data->_errno = 0;
 699                         }
 700                 else
 701                         ret = 0;
 702                 break;
 703 #ifdef EMSGSIZE
 704         case BIO_CTRL_DGRAM_MTU_EXCEEDED:
 705                 if ( data->_errno == EMSGSIZE)
 706                         {
 707                         ret = 1;
 708                         data->_errno = 0;
 709                         }
 710                 else
 711                         ret = 0;
 712                 break;
 713 #endif
 714         default:
 715                 ret=0;
 716                 break;
 717                 }
 718         return(ret);
 719         }
 720
 721 static int dgram_puts(BIO *bp, const char *str)
 722         {
 723         int n,ret;
 724
 725         n=strlen(str);
 726         ret=dgram_write(bp,str,n);
 727         return(ret);
 728         }
 729
 730 static int BIO_dgram_should_retry(int i)
 731         {
 732         int err;
 733
 734         if ((i == 0) || (i == -1))
 735                 {
 736                 err=get_last_socket_error();
 737
 738 #if defined(OPENSSL_SYS_WINDOWS) && 0 /* more microsoft stupidity? perhaps not? Ben 4/1/99 */
 739                 if ((i == -1) && (err == 0))
 740                         return(1);
 741 #endif
 742
 743                 return(BIO_dgram_non_fatal_error(err));
 744                 }
 745         return(0);
 746         }
 747
 748 int BIO_dgram_non_fatal_error(int err)
 749         {
 750         switch (err)
 751                 {
 752 #if defined(OPENSSL_SYS_WINDOWS)
 753 # if defined(WSAEWOULDBLOCK)
 754         case WSAEWOULDBLOCK:
 755 # endif
 756
 757 # if 0 /* This appears to always be an error */
 758 #  if defined(WSAENOTCONN)
 759         case WSAENOTCONN:
 760 #  endif
 761 # endif
 762 #endif
 763
 764 #ifdef EWOULDBLOCK
 765 # ifdef WSAEWOULDBLOCK
 766 #  if WSAEWOULDBLOCK != EWOULDBLOCK
 767         case EWOULDBLOCK:
 768 #  endif
 769 # else
 770         case EWOULDBLOCK:
 771 # endif
 772 #endif
 773
 774 #ifdef EINTR
 775         case EINTR:
 776 #endif
 777
 778 #ifdef EAGAIN
 779 #if EWOULDBLOCK != EAGAIN
 780         case EAGAIN:
 781 # endif
 782 #endif
 783
 784 #ifdef EPROTO
 785         case EPROTO:
 786 #endif
 787
 788 #ifdef EINPROGRESS
 789         case EINPROGRESS:
 790 #endif
 791
 792 #ifdef EALREADY
 793         case EALREADY:
 794 #endif
 795
 796                 return(1);
 797                 /* break; */
 798         default:
 799                 break;
 800                 }
 801         return(0);
 802         }
 803 #endif
 804
 805 static void get_current_time(struct timeval *t)
 806         {
 807 #ifdef OPENSSL_SYS_WIN32
 808         struct _timeb tb;
 809         _ftime(&tb);
 810         t->tv_sec = (long)tb.time;
 811         t->tv_usec = (long)tb.millitm * 1000;
 812 #elif defined(OPENSSL_SYS_VMS)
 813         struct timeb tb;
 814         ftime(&tb);
 815         t->tv_sec = (long)tb.time;
 816         t->tv_usec = (long)tb.millitm * 1000;
 817 #else
 818         gettimeofday(t, NULL);
 819 #endif
 820         }