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