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