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
  61 #include <stdio.h>
  62 #include <errno.h>
  63 #define USE_SOCKETS
  64 #include "cryptlib.h"
  65
  66 #include <openssl/bio.h>
  67 #ifndef OPENSSL_NO_DGRAM
  68
  69 #if defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_VMS)
  70 #include <sys/timeb.h>
  71 #endif
  72
  73 #ifndef OPENSSL_NO_SCTP
  74 #include <netinet/sctp.h>
  75 #include <fcntl.h>
  76 #define OPENSSL_SCTP_DATA_CHUNK_TYPE            0x00
  77 #define OPENSSL_SCTP_FORWARD_CUM_TSN_CHUNK_TYPE 0xc0
  78 #endif
  79
  80 #ifdef OPENSSL_SYS_LINUX
  81 #define IP_MTU      14 /* linux is lame */
  82 #endif
  83
  84 #ifdef __FreeBSD__
  85 /* Standard definition causes type-punning problems. */
  86 #undef IN6_IS_ADDR_V4MAPPED
  87 #define s6_addr32 __u6_addr.__u6_addr32
  88 #define IN6_IS_ADDR_V4MAPPED(a)               \
  89         (((a)->s6_addr32[0] == 0) &&          \
  90          ((a)->s6_addr32[1] == 0) &&          \
  91          ((a)->s6_addr32[2] == htonl(0x0000ffff)))
  92 #endif
  93
  94 #ifdef WATT32
  95 #define sock_write SockWrite  /* Watt-32 uses same names */
  96 #define sock_read  SockRead
  97 #define sock_puts  SockPuts
  98 #endif
  99
 100 static int dgram_write(BIO *h, const char *buf, int num);
 101 static int dgram_read(BIO *h, char *buf, int size);
 102 static int dgram_puts(BIO *h, const char *str);
 103 static long dgram_ctrl(BIO *h, int cmd, long arg1, void *arg2);
 104 static int dgram_new(BIO *h);
 105 static int dgram_free(BIO *data);
 106 static int dgram_clear(BIO *bio);
 107
 108 #ifndef OPENSSL_NO_SCTP
 109 static int dgram_sctp_write(BIO *h, const char *buf, int num);
 110 static int dgram_sctp_read(BIO *h, char *buf, int size);
 111 static int dgram_sctp_puts(BIO *h, const char *str);
 112 static long dgram_sctp_ctrl(BIO *h, int cmd, long arg1, void *arg2);
 113 static int dgram_sctp_new(BIO *h);
 114 static int dgram_sctp_free(BIO *data);
 115 #ifdef SCTP_AUTHENTICATION_EVENT
 116 static void dgram_sctp_handle_auth_free_key_event(BIO *b, union sctp_notification *snp);
 117 #endif
 118 #endif
 119
 120 static int BIO_dgram_should_retry(int s);
 121
 122 static void get_current_time(struct timeval *t);
 123
 124 static BIO_METHOD methods_dgramp=
 125         {
 126         BIO_TYPE_DGRAM,
 127         "datagram socket",
 128         dgram_write,
 129         dgram_read,
 130         dgram_puts,
 131         NULL, /* dgram_gets, */
 132         dgram_ctrl,
 133         dgram_new,
 134         dgram_free,
 135         NULL,
 136         };
 137
 138 #ifndef OPENSSL_NO_SCTP
 139 static BIO_METHOD methods_dgramp_sctp=
 140         {
 141         BIO_TYPE_DGRAM_SCTP,
 142         "datagram sctp socket",
 143         dgram_sctp_write,
 144         dgram_sctp_read,
 145         dgram_sctp_puts,
 146         NULL, /* dgram_gets, */
 147         dgram_sctp_ctrl,
 148         dgram_sctp_new,
 149         dgram_sctp_free,
 150         NULL,
 151         };
 152 #endif
 153
 154 typedef struct bio_dgram_data_st
 155         {
 156         union {
 157                 struct sockaddr sa;
 158                 struct sockaddr_in sa_in;
 159 #if OPENSSL_USE_IPV6
 160                 struct sockaddr_in6 sa_in6;
 161 #endif
 162         } peer;
 163         unsigned int connected;
 164         unsigned int _errno;
 165         unsigned int mtu;
 166         struct timeval next_timeout;
 167         struct timeval socket_timeout;
 168         } bio_dgram_data;
 169
 170 #ifndef OPENSSL_NO_SCTP
 171 typedef struct bio_dgram_sctp_save_message_st
 172         {
 173         BIO *bio;
 174         char *data;
 175         int length;
 176         } bio_dgram_sctp_save_message;
 177
 178 typedef struct bio_dgram_sctp_data_st
 179         {
 180         union {
 181                 struct sockaddr sa;
 182                 struct sockaddr_in sa_in;
 183 #if OPENSSL_USE_IPV6
 184                 struct sockaddr_in6 sa_in6;
 185 #endif
 186         } peer;
 187         unsigned int connected;
 188         unsigned int _errno;
 189         unsigned int mtu;
 190         struct bio_dgram_sctp_sndinfo sndinfo;
 191         struct bio_dgram_sctp_rcvinfo rcvinfo;
 192         struct bio_dgram_sctp_prinfo prinfo;
 193         void (*handle_notifications)(BIO *bio, void *context, void *buf);
 194         void* notification_context;
 195         int in_handshake;
 196         int ccs_rcvd;
 197         int ccs_sent;
 198         int save_shutdown;
 199         int peer_auth_tested;
 200         bio_dgram_sctp_save_message saved_message;
 201         } bio_dgram_sctp_data;
 202 #endif
 203
 204 BIO_METHOD *BIO_s_datagram(void)
 205         {
 206         return(&methods_dgramp);
 207         }
 208
 209 BIO *BIO_new_dgram(int fd, int close_flag)
 210         {
 211         BIO *ret;
 212
 213         ret=BIO_new(BIO_s_datagram());
 214         if (ret == NULL) return(NULL);
 215         BIO_set_fd(ret,fd,close_flag);
 216         return(ret);
 217         }
 218
 219 static int dgram_new(BIO *bi)
 220         {
 221         bio_dgram_data *data = NULL;
 222
 223         bi->init=0;
 224         bi->num=0;
 225         data = OPENSSL_malloc(sizeof(bio_dgram_data));
 226         if (data == NULL)
 227                 return 0;
 228         memset(data, 0x00, sizeof(bio_dgram_data));
 229     bi->ptr = data;
 230
 231         bi->flags=0;
 232         return(1);
 233         }
 234
 235 static int dgram_free(BIO *a)
 236         {
 237         bio_dgram_data *data;
 238
 239         if (a == NULL) return(0);
 240         if ( ! dgram_clear(a))
 241                 return 0;
 242
 243         data = (bio_dgram_data *)a->ptr;
 244         if(data != NULL) OPENSSL_free(data);
 245
 246         return(1);
 247         }
 248
 249 static int dgram_clear(BIO *a)
 250         {
 251         if (a == NULL) return(0);
 252         if (a->shutdown)
 253                 {
 254                 if (a->init)
 255                         {
 256                         SHUTDOWN2(a->num);
 257                         }
 258                 a->init=0;
 259                 a->flags=0;
 260                 }
 261         return(1);
 262         }
 263
 264 static void dgram_adjust_rcv_timeout(BIO *b)
 265         {
 266 #if defined(SO_RCVTIMEO)
 267         bio_dgram_data *data = (bio_dgram_data *)b->ptr;
 268         int sz = sizeof(int);
 269
 270         /* Is a timer active? */
 271         if (data->next_timeout.tv_sec > 0 || data->next_timeout.tv_usec > 0)
 272                 {
 273                 struct timeval timenow, timeleft;
 274
 275                 /* Read current socket timeout */
 276 #ifdef OPENSSL_SYS_WINDOWS
 277                 int timeout;
 278                 if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 279                                            (void*)&timeout, &sz) < 0)
 280                         { perror("getsockopt"); }
 281                 else
 282                         {
 283                         data->socket_timeout.tv_sec = timeout / 1000;
 284                         data->socket_timeout.tv_usec = (timeout % 1000) * 1000;
 285                         }
 286 #else
 287                 if ( getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 288                                                 &(data->socket_timeout), (void *)&sz) < 0)
 289                         { perror("getsockopt"); }
 290 #endif
 291
 292                 /* Get current time */
 293                 get_current_time(&timenow);
 294
 295                 /* Calculate time left until timer expires */
 296                 memcpy(&timeleft, &(data->next_timeout), sizeof(struct timeval));
 297                 timeleft.tv_sec -= timenow.tv_sec;
 298                 timeleft.tv_usec -= timenow.tv_usec;
 299                 if (timeleft.tv_usec < 0)
 300                         {
 301                         timeleft.tv_sec--;
 302                         timeleft.tv_usec += 1000000;
 303                         }
 304
 305                 if (timeleft.tv_sec < 0)
 306                         {
 307                         timeleft.tv_sec = 0;
 308                         timeleft.tv_usec = 1;
 309                         }
 310
 311                 /* Adjust socket timeout if next handhake message timer
 312                  * will expire earlier.
 313                  */
 314                 if ((data->socket_timeout.tv_sec == 0 && data->socket_timeout.tv_usec == 0) ||
 315                         (data->socket_timeout.tv_sec > timeleft.tv_sec) ||
 316                         (data->socket_timeout.tv_sec == timeleft.tv_sec &&
 317                          data->socket_timeout.tv_usec >= timeleft.tv_usec))
 318                         {
 319 #ifdef OPENSSL_SYS_WINDOWS
 320                         timeout = timeleft.tv_sec * 1000 + timeleft.tv_usec / 1000;
 321                         if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 322                                                    (void*)&timeout, sizeof(timeout)) < 0)
 323                                 { perror("setsockopt"); }
 324 #else
 325                         if ( setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, &timeleft,
 326                                                         sizeof(struct timeval)) < 0)
 327                                 { perror("setsockopt"); }
 328 #endif
 329                         }
 330                 }
 331 #endif
 332         }
 333
 334 static void dgram_reset_rcv_timeout(BIO *b)
 335         {
 336 #if defined(SO_RCVTIMEO)
 337         bio_dgram_data *data = (bio_dgram_data *)b->ptr;
 338
 339         /* Is a timer active? */
 340         if (data->next_timeout.tv_sec > 0 || data->next_timeout.tv_usec > 0)
 341                 {
 342 #ifdef OPENSSL_SYS_WINDOWS
 343                 int timeout = data->socket_timeout.tv_sec * 1000 +
 344                                           data->socket_timeout.tv_usec / 1000;
 345                 if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 346                                            (void*)&timeout, sizeof(timeout)) < 0)
 347                         { perror("setsockopt"); }
 348 #else
 349                 if ( setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, &(data->socket_timeout),
 350                                                 sizeof(struct timeval)) < 0)
 351                         { perror("setsockopt"); }
 352 #endif
 353                 }
 354 #endif
 355         }
 356
 357 static int dgram_read(BIO *b, char *out, int outl)
 358         {
 359         int ret=0;
 360         bio_dgram_data *data = (bio_dgram_data *)b->ptr;
 361
 362         struct  {
 363         /*
 364          * See commentary in b_sock.c. <appro>
 365          */
 366         union   { size_t s; int i; } len;
 367         union   {
 368                 struct sockaddr sa;
 369                 struct sockaddr_in sa_in;
 370 #if OPENSSL_USE_IPV6
 371                 struct sockaddr_in6 sa_in6;
 372 #endif
 373                 } peer;
 374         } sa;
 375
 376         sa.len.s=0;
 377         sa.len.i=sizeof(sa.peer);
 378
 379         if (out != NULL)
 380                 {
 381                 clear_socket_error();
 382                 memset(&sa.peer, 0x00, sizeof(sa.peer));
 383                 dgram_adjust_rcv_timeout(b);
 384                 ret=recvfrom(b->num,out,outl,0,&sa.peer.sa,(void *)&sa.len);
 385                 if (sizeof(sa.len.i)!=sizeof(sa.len.s) && sa.len.i==0)
 386                         {
 387                         OPENSSL_assert(sa.len.s<=sizeof(sa.peer));
 388                         sa.len.i = (int)sa.len.s;
 389                         }
 390
 391                 if ( ! data->connected  && ret >= 0)
 392                         BIO_ctrl(b, BIO_CTRL_DGRAM_SET_PEER, 0, &sa.peer);
 393
 394                 BIO_clear_retry_flags(b);
 395                 if (ret < 0)
 396                         {
 397                         if (BIO_dgram_should_retry(ret))
 398                                 {
 399                                 BIO_set_retry_read(b);
 400                                 data->_errno = get_last_socket_error();
 401                                 }
 402                         }
 403
 404                 dgram_reset_rcv_timeout(b);
 405                 }
 406         return(ret);
 407         }
 408
 409 static int dgram_write(BIO *b, const char *in, int inl)
 410         {
 411         int ret;
 412         bio_dgram_data *data = (bio_dgram_data *)b->ptr;
 413         clear_socket_error();
 414
 415         if ( data->connected )
 416                 ret=writesocket(b->num,in,inl);
 417         else
 418                 {
 419                 int peerlen = sizeof(data->peer);
 420
 421                 if (data->peer.sa.sa_family == AF_INET)
 422                         peerlen = sizeof(data->peer.sa_in);
 423 #if OPENSSL_USE_IPV6
 424                 else if (data->peer.sa.sa_family == AF_INET6)
 425                         peerlen = sizeof(data->peer.sa_in6);
 426 #endif
 427 #if defined(NETWARE_CLIB) && defined(NETWARE_BSDSOCK)
 428                 ret=sendto(b->num, (char *)in, inl, 0, &data->peer.sa, peerlen);
 429 #else
 430                 ret=sendto(b->num, in, inl, 0, &data->peer.sa, peerlen);
 431 #endif
 432                 }
 433
 434         BIO_clear_retry_flags(b);
 435         if (ret <= 0)
 436                 {
 437                 if (BIO_dgram_should_retry(ret))
 438                         {
 439                         BIO_set_retry_write(b);
 440                         data->_errno = get_last_socket_error();
 441
 442 #if 0 /* higher layers are responsible for querying MTU, if necessary */
 443                         if ( data->_errno == EMSGSIZE)
 444                                 /* retrieve the new MTU */
 445                                 BIO_ctrl(b, BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
 446 #endif
 447                         }
 448                 }
 449         return(ret);
 450         }
 451
 452 static long dgram_ctrl(BIO *b, int cmd, long num, void *ptr)
 453         {
 454         long ret=1;
 455         int *ip;
 456         struct sockaddr *to = NULL;
 457         bio_dgram_data *data = NULL;
 458 #if defined(IP_MTU_DISCOVER) || defined(IP_MTU)
 459         long sockopt_val = 0;
 460         unsigned int sockopt_len = 0;
 461 #endif
 462 #ifdef OPENSSL_SYS_LINUX
 463         socklen_t addr_len;
 464         union   {
 465                 struct sockaddr sa;
 466                 struct sockaddr_in s4;
 467 #if OPENSSL_USE_IPV6
 468                 struct sockaddr_in6 s6;
 469 #endif
 470                 } addr;
 471 #endif
 472
 473         data = (bio_dgram_data *)b->ptr;
 474
 475         switch (cmd)
 476                 {
 477         case BIO_CTRL_RESET:
 478                 num=0;
 479         case BIO_C_FILE_SEEK:
 480                 ret=0;
 481                 break;
 482         case BIO_C_FILE_TELL:
 483         case BIO_CTRL_INFO:
 484                 ret=0;
 485                 break;
 486         case BIO_C_SET_FD:
 487                 dgram_clear(b);
 488                 b->num= *((int *)ptr);
 489                 b->shutdown=(int)num;
 490                 b->init=1;
 491                 break;
 492         case BIO_C_GET_FD:
 493                 if (b->init)
 494                         {
 495                         ip=(int *)ptr;
 496                         if (ip != NULL) *ip=b->num;
 497                         ret=b->num;
 498                         }
 499                 else
 500                         ret= -1;
 501                 break;
 502         case BIO_CTRL_GET_CLOSE:
 503                 ret=b->shutdown;
 504                 break;
 505         case BIO_CTRL_SET_CLOSE:
 506                 b->shutdown=(int)num;
 507                 break;
 508         case BIO_CTRL_PENDING:
 509         case BIO_CTRL_WPENDING:
 510                 ret=0;
 511                 break;
 512         case BIO_CTRL_DUP:
 513         case BIO_CTRL_FLUSH:
 514                 ret=1;
 515                 break;
 516         case BIO_CTRL_DGRAM_CONNECT:
 517                 to = (struct sockaddr *)ptr;
 518 #if 0
 519                 if (connect(b->num, to, sizeof(struct sockaddr)) < 0)
 520                         { perror("connect"); ret = 0; }
 521                 else
 522                         {
 523 #endif
 524                         switch (to->sa_family)
 525                                 {
 526                                 case AF_INET:
 527                                         memcpy(&data->peer,to,sizeof(data->peer.sa_in));
 528                                         break;
 529 #if OPENSSL_USE_IPV6
 530                                 case AF_INET6:
 531                                         memcpy(&data->peer,to,sizeof(data->peer.sa_in6));
 532                                         break;
 533 #endif
 534                                 default:
 535                                         memcpy(&data->peer,to,sizeof(data->peer.sa));
 536                                         break;
 537                                 }
 538 #if 0
 539                         }
 540 #endif
 541                 break;
 542                 /* (Linux)kernel sets DF bit on outgoing IP packets */
 543         case BIO_CTRL_DGRAM_MTU_DISCOVER:
 544 #ifdef OPENSSL_SYS_LINUX
 545                 addr_len = (socklen_t)sizeof(addr);
 546                 memset((void *)&addr, 0, sizeof(addr));
 547                 if (getsockname(b->num, &addr.sa, &addr_len) < 0)
 548                         {
 549                         ret = 0;
 550                         break;
 551                         }
 552                 sockopt_len = sizeof(sockopt_val);
 553                 switch (addr.sa.sa_family)
 554                         {
 555                 case AF_INET:
 556                         sockopt_val = IP_PMTUDISC_DO;
 557                         if ((ret = setsockopt(b->num, IPPROTO_IP, IP_MTU_DISCOVER,
 558                                 &sockopt_val, sizeof(sockopt_val))) < 0)
 559                                 perror("setsockopt");
 560                         break;
 561 #if OPENSSL_USE_IPV6 && defined(IPV6_MTU_DISCOVER)
 562                 case AF_INET6:
 563                         sockopt_val = IPV6_PMTUDISC_DO;
 564                         if ((ret = setsockopt(b->num, IPPROTO_IPV6, IPV6_MTU_DISCOVER,
 565                                 &sockopt_val, sizeof(sockopt_val))) < 0)
 566                                 perror("setsockopt");
 567                         break;
 568 #endif
 569                 default:
 570                         ret = -1;
 571                         break;
 572                         }
 573                 ret = -1;
 574 #else
 575                 break;
 576 #endif
 577         case BIO_CTRL_DGRAM_QUERY_MTU:
 578 #ifdef OPENSSL_SYS_LINUX
 579                 addr_len = (socklen_t)sizeof(addr);
 580                 memset((void *)&addr, 0, sizeof(addr));
 581                 if (getsockname(b->num, &addr.sa, &addr_len) < 0)
 582                         {
 583                         ret = 0;
 584                         break;
 585                         }
 586                 sockopt_len = sizeof(sockopt_val);
 587                 switch (addr.sa.sa_family)
 588                         {
 589                 case AF_INET:
 590                         if ((ret = getsockopt(b->num, IPPROTO_IP, IP_MTU, (void *)&sockopt_val,
 591                                 &sockopt_len)) < 0 || sockopt_val < 0)
 592                                 {
 593                                 ret = 0;
 594                                 }
 595                         else
 596                                 {
 597                                 /* we assume that the transport protocol is UDP and no
 598                                  * IP options are used.
 599                                  */
 600                                 data->mtu = sockopt_val - 8 - 20;
 601                                 ret = data->mtu;
 602                                 }
 603                         break;
 604 #if OPENSSL_USE_IPV6 && defined(IPV6_MTU)
 605                 case AF_INET6:
 606                         if ((ret = getsockopt(b->num, IPPROTO_IPV6, IPV6_MTU, (void *)&sockopt_val,
 607                                 &sockopt_len)) < 0 || sockopt_val < 0)
 608                                 {
 609                                 ret = 0;
 610                                 }
 611                         else
 612                                 {
 613                                 /* we assume that the transport protocol is UDP and no
 614                                  * IPV6 options are used.
 615                                  */
 616                                 data->mtu = sockopt_val - 8 - 40;
 617                                 ret = data->mtu;
 618                                 }
 619                         break;
 620 #endif
 621                 default:
 622                         ret = 0;
 623                         break;
 624                         }
 625 #else
 626                 ret = 0;
 627 #endif
 628                 break;
 629         case BIO_CTRL_DGRAM_GET_FALLBACK_MTU:
 630                 switch (data->peer.sa.sa_family)
 631                         {
 632                         case AF_INET:
 633                                 ret = 576 - 20 - 8;
 634                                 break;
 635 #if OPENSSL_USE_IPV6
 636                         case AF_INET6:
 637 #ifdef IN6_IS_ADDR_V4MAPPED
 638                                 if (IN6_IS_ADDR_V4MAPPED(&data->peer.sa_in6.sin6_addr))
 639                                         ret = 576 - 20 - 8;
 640                                 else
 641 #endif
 642                                         ret = 1280 - 40 - 8;
 643                                 break;
 644 #endif
 645                         default:
 646                                 ret = 576 - 20 - 8;
 647                                 break;
 648                         }
 649                 break;
 650         case BIO_CTRL_DGRAM_GET_MTU:
 651                 return data->mtu;
 652                 break;
 653         case BIO_CTRL_DGRAM_SET_MTU:
 654                 data->mtu = num;
 655                 ret = num;
 656                 break;
 657         case BIO_CTRL_DGRAM_SET_CONNECTED:
 658                 to = (struct sockaddr *)ptr;
 659
 660                 if ( to != NULL)
 661                         {
 662                         data->connected = 1;
 663                         switch (to->sa_family)
 664                                 {
 665                                 case AF_INET:
 666                                         memcpy(&data->peer,to,sizeof(data->peer.sa_in));
 667                                         break;
 668 #if OPENSSL_USE_IPV6
 669                                 case AF_INET6:
 670                                         memcpy(&data->peer,to,sizeof(data->peer.sa_in6));
 671                                         break;
 672 #endif
 673                                 default:
 674                                         memcpy(&data->peer,to,sizeof(data->peer.sa));
 675                                         break;
 676                                 }
 677                         }
 678                 else
 679                         {
 680                         data->connected = 0;
 681                         memset(&(data->peer), 0x00, sizeof(data->peer));
 682                         }
 683                 break;
 684         case BIO_CTRL_DGRAM_GET_PEER:
 685                 switch (data->peer.sa.sa_family)
 686                         {
 687                         case AF_INET:
 688                                 ret=sizeof(data->peer.sa_in);
 689                                 break;
 690 #if OPENSSL_USE_IPV6
 691                         case AF_INET6:
 692                                 ret=sizeof(data->peer.sa_in6);
 693                                 break;
 694 #endif
 695                         default:
 696                                 ret=sizeof(data->peer.sa);
 697                                 break;
 698                         }
 699                 if (num==0 || num>ret)
 700                         num=ret;
 701                 memcpy(ptr,&data->peer,(ret=num));
 702                 break;
 703         case BIO_CTRL_DGRAM_SET_PEER:
 704                 to = (struct sockaddr *) ptr;
 705                 switch (to->sa_family)
 706                         {
 707                         case AF_INET:
 708                                 memcpy(&data->peer,to,sizeof(data->peer.sa_in));
 709                                 break;
 710 #if OPENSSL_USE_IPV6
 711                         case AF_INET6:
 712                                 memcpy(&data->peer,to,sizeof(data->peer.sa_in6));
 713                                 break;
 714 #endif
 715                         default:
 716                                 memcpy(&data->peer,to,sizeof(data->peer.sa));
 717                                 break;
 718                         }
 719                 break;
 720         case BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT:
 721                 memcpy(&(data->next_timeout), ptr, sizeof(struct timeval));
 722                 break;
 723 #if defined(SO_RCVTIMEO)
 724         case BIO_CTRL_DGRAM_SET_RECV_TIMEOUT:
 725 #ifdef OPENSSL_SYS_WINDOWS
 726                 {
 727                 struct timeval *tv = (struct timeval *)ptr;
 728                 int timeout = tv->tv_sec * 1000 + tv->tv_usec/1000;
 729                 if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 730                         (void*)&timeout, sizeof(timeout)) < 0)
 731                         { perror("setsockopt"); ret = -1; }
 732                 }
 733 #else
 734                 if ( setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, ptr,
 735                         sizeof(struct timeval)) < 0)
 736                         { perror("setsockopt"); ret = -1; }
 737 #endif
 738                 break;
 739         case BIO_CTRL_DGRAM_GET_RECV_TIMEOUT:
 740 #ifdef OPENSSL_SYS_WINDOWS
 741                 {
 742                 int timeout, sz = sizeof(timeout);
 743                 struct timeval *tv = (struct timeval *)ptr;
 744                 if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 745                         (void*)&timeout, &sz) < 0)
 746                         { perror("getsockopt"); ret = -1; }
 747                 else
 748                         {
 749                         tv->tv_sec = timeout / 1000;
 750                         tv->tv_usec = (timeout % 1000) * 1000;
 751                         ret = sizeof(*tv);
 752                         }
 753                 }
 754 #else
 755                 if ( getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 756                         ptr, (void *)&ret) < 0)
 757                         { perror("getsockopt"); ret = -1; }
 758 #endif
 759                 break;
 760 #endif
 761 #if defined(SO_SNDTIMEO)
 762         case BIO_CTRL_DGRAM_SET_SEND_TIMEOUT:
 763 #ifdef OPENSSL_SYS_WINDOWS
 764                 {
 765                 struct timeval *tv = (struct timeval *)ptr;
 766                 int timeout = tv->tv_sec * 1000 + tv->tv_usec/1000;
 767                 if (setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
 768                         (void*)&timeout, sizeof(timeout)) < 0)
 769                         { perror("setsockopt"); ret = -1; }
 770                 }
 771 #else
 772                 if ( setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO, ptr,
 773                         sizeof(struct timeval)) < 0)
 774                         { perror("setsockopt"); ret = -1; }
 775 #endif
 776                 break;
 777         case BIO_CTRL_DGRAM_GET_SEND_TIMEOUT:
 778 #ifdef OPENSSL_SYS_WINDOWS
 779                 {
 780                 int timeout, sz = sizeof(timeout);
 781                 struct timeval *tv = (struct timeval *)ptr;
 782                 if (getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
 783                         (void*)&timeout, &sz) < 0)
 784                         { perror("getsockopt"); ret = -1; }
 785                 else
 786                         {
 787                         tv->tv_sec = timeout / 1000;
 788                         tv->tv_usec = (timeout % 1000) * 1000;
 789                         ret = sizeof(*tv);
 790                         }
 791                 }
 792 #else
 793                 if ( getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
 794                         ptr, (void *)&ret) < 0)
 795                         { perror("getsockopt"); ret = -1; }
 796 #endif
 797                 break;
 798 #endif
 799         case BIO_CTRL_DGRAM_GET_SEND_TIMER_EXP:
 800                 /* fall-through */
 801         case BIO_CTRL_DGRAM_GET_RECV_TIMER_EXP:
 802 #ifdef OPENSSL_SYS_WINDOWS
 803                 if ( data->_errno == WSAETIMEDOUT)
 804 #else
 805                 if ( data->_errno == EAGAIN)
 806 #endif
 807                         {
 808                         ret = 1;
 809                         data->_errno = 0;
 810                         }
 811                 else
 812                         ret = 0;
 813                 break;
 814 #ifdef EMSGSIZE
 815         case BIO_CTRL_DGRAM_MTU_EXCEEDED:
 816                 if ( data->_errno == EMSGSIZE)
 817                         {
 818                         ret = 1;
 819                         data->_errno = 0;
 820                         }
 821                 else
 822                         ret = 0;
 823                 break;
 824 #endif
 825         default:
 826                 ret=0;
 827                 break;
 828                 }
 829         return(ret);
 830         }
 831
 832 static int dgram_puts(BIO *bp, const char *str)
 833         {
 834         int n,ret;
 835
 836         n=strlen(str);
 837         ret=dgram_write(bp,str,n);
 838         return(ret);
 839         }
 840
 841 #ifndef OPENSSL_NO_SCTP
 842 BIO_METHOD *BIO_s_datagram_sctp(void)
 843         {
 844         return(&methods_dgramp_sctp);
 845         }
 846
 847 BIO *BIO_new_dgram_sctp(int fd, int close_flag)
 848         {
 849         BIO *bio;
 850         int ret, optval = 20000;
 851         int auth_data = 0, auth_forward = 0;
 852         unsigned char *p;
 853         struct sctp_authchunk auth;
 854         struct sctp_authchunks *authchunks;
 855         socklen_t sockopt_len;
 856 #ifdef SCTP_AUTHENTICATION_EVENT
 857 #ifdef SCTP_EVENT
 858         struct sctp_event event;
 859 #else
 860         struct sctp_event_subscribe event;
 861 #endif
 862 #endif
 863
 864         bio=BIO_new(BIO_s_datagram_sctp());
 865         if (bio == NULL) return(NULL);
 866         BIO_set_fd(bio,fd,close_flag);
 867
 868         /* Activate SCTP-AUTH for DATA and FORWARD-TSN chunks */
 869         auth.sauth_chunk = OPENSSL_SCTP_DATA_CHUNK_TYPE;
 870         ret = setsockopt(fd, IPPROTO_SCTP, SCTP_AUTH_CHUNK, &auth, sizeof(struct sctp_authchunk));
 871         OPENSSL_assert(ret >= 0);
 872         auth.sauth_chunk = OPENSSL_SCTP_FORWARD_CUM_TSN_CHUNK_TYPE;
 873         ret = setsockopt(fd, IPPROTO_SCTP, SCTP_AUTH_CHUNK, &auth, sizeof(struct sctp_authchunk));
 874         OPENSSL_assert(ret >= 0);
 875
 876         /* Test if activation was successful. When using accept(),
 877          * SCTP-AUTH has to be activated for the listening socket
 878          * already, otherwise the connected socket won't use it. */
 879         sockopt_len = (socklen_t)(sizeof(sctp_assoc_t) + 256 * sizeof(uint8_t));
 880         authchunks = OPENSSL_malloc(sockopt_len);
 881         memset(authchunks, 0, sizeof(sockopt_len));
 882         ret = getsockopt(fd, IPPROTO_SCTP, SCTP_LOCAL_AUTH_CHUNKS, authchunks, &sockopt_len);
 883         OPENSSL_assert(ret >= 0);
 884
 885         for (p = (unsigned char*) authchunks + sizeof(sctp_assoc_t);
 886              p < (unsigned char*) authchunks + sockopt_len;
 887              p += sizeof(uint8_t))
 888                 {
 889                 if (*p == OPENSSL_SCTP_DATA_CHUNK_TYPE) auth_data = 1;
 890                 if (*p == OPENSSL_SCTP_FORWARD_CUM_TSN_CHUNK_TYPE) auth_forward = 1;
 891                 }
 892
 893         OPENSSL_free(authchunks);
 894
 895         OPENSSL_assert(auth_data);
 896         OPENSSL_assert(auth_forward);
 897
 898 #ifdef SCTP_AUTHENTICATION_EVENT
 899 #ifdef SCTP_EVENT
 900         memset(&event, 0, sizeof(struct sctp_event));
 901         event.se_assoc_id = 0;
 902         event.se_type = SCTP_AUTHENTICATION_EVENT;
 903         event.se_on = 1;
 904         ret = setsockopt(fd, IPPROTO_SCTP, SCTP_EVENT, &event, sizeof(struct sctp_event));
 905         OPENSSL_assert(ret >= 0);
 906 #else
 907         sockopt_len = (socklen_t) sizeof(struct sctp_event_subscribe);
 908         ret = getsockopt(fd, IPPROTO_SCTP, SCTP_EVENTS, &event, &sockopt_len);
 909         OPENSSL_assert(ret >= 0);
 910
 911         event.sctp_authentication_event = 1;
 912
 913         ret = setsockopt(fd, IPPROTO_SCTP, SCTP_EVENTS, &event, sizeof(struct sctp_event_subscribe));
 914         OPENSSL_assert(ret >= 0);
 915 #endif
 916 #endif
 917
 918         /* Disable partial delivery by setting the min size
 919          * larger than the max record size of 2^14 + 2048 + 13
 920          */
 921         ret = setsockopt(fd, IPPROTO_SCTP, SCTP_PARTIAL_DELIVERY_POINT, &optval, sizeof(optval));
 922         OPENSSL_assert(ret >= 0);
 923
 924         return(bio);
 925         }
 926
 927 int BIO_dgram_is_sctp(BIO *bio)
 928         {
 929         return (BIO_method_type(bio) == BIO_TYPE_DGRAM_SCTP);
 930         }
 931
 932 static int dgram_sctp_new(BIO *bi)
 933         {
 934         bio_dgram_sctp_data *data = NULL;
 935
 936         bi->init=0;
 937         bi->num=0;
 938         data = OPENSSL_malloc(sizeof(bio_dgram_sctp_data));
 939         if (data == NULL)
 940                 return 0;
 941         memset(data, 0x00, sizeof(bio_dgram_sctp_data));
 942 #ifdef SCTP_PR_SCTP_NONE
 943         data->prinfo.pr_policy = SCTP_PR_SCTP_NONE;
 944 #endif
 945     bi->ptr = data;
 946
 947         bi->flags=0;
 948         return(1);
 949         }
 950
 951 static int dgram_sctp_free(BIO *a)
 952         {
 953         bio_dgram_sctp_data *data;
 954
 955         if (a == NULL) return(0);
 956         if ( ! dgram_clear(a))
 957                 return 0;
 958
 959         data = (bio_dgram_sctp_data *)a->ptr;
 960         if(data != NULL) OPENSSL_free(data);
 961
 962         return(1);
 963         }
 964
 965 #ifdef SCTP_AUTHENTICATION_EVENT
 966 void dgram_sctp_handle_auth_free_key_event(BIO *b, union sctp_notification *snp)
 967         {
 968         unsigned int sockopt_len = 0;
 969         int ret;
 970         struct sctp_authkey_event* authkeyevent = &snp->sn_auth_event;
 971
 972         if (authkeyevent->auth_indication == SCTP_AUTH_FREE_KEY)
 973                 {
 974                 struct sctp_authkeyid authkeyid;
 975
 976                 /* delete key */
 977                 authkeyid.scact_keynumber = authkeyevent->auth_keynumber;
 978                 sockopt_len = sizeof(struct sctp_authkeyid);
 979                 ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_DELETE_KEY,
 980                       &authkeyid, sockopt_len);
 981                 }
 982         }
 983 #endif
 984
 985 static int dgram_sctp_read(BIO *b, char *out, int outl)
 986         {
 987         int ret = 0, n = 0, i, optval;
 988         socklen_t optlen;
 989         bio_dgram_sctp_data *data = (bio_dgram_sctp_data *)b->ptr;
 990         union sctp_notification *snp;
 991         struct msghdr msg;
 992         struct iovec iov;
 993         struct cmsghdr *cmsg;
 994         char cmsgbuf[512];
 995
 996         if (out != NULL)
 997                 {
 998                 clear_socket_error();
 999
1000                 do
1001                         {
1002                         memset(&data->rcvinfo, 0x00, sizeof(struct bio_dgram_sctp_rcvinfo));
1003                         iov.iov_base = out;
1004                         iov.iov_len = outl;
1005                         msg.msg_name = NULL;
1006                         msg.msg_namelen = 0;
1007                         msg.msg_iov = &iov;
1008                         msg.msg_iovlen = 1;
1009                         msg.msg_control = cmsgbuf;
1010                         msg.msg_controllen = 512;
1011                         msg.msg_flags = 0;
1012                         n = recvmsg(b->num, &msg, 0);
1013
1014                         if (msg.msg_controllen > 0)
1015                                 {
1016                                 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg))
1017                                         {
1018                                         if (cmsg->cmsg_level != IPPROTO_SCTP)
1019                                                 continue;
1020 #ifdef SCTP_RCVINFO
1021                                         if (cmsg->cmsg_type == SCTP_RCVINFO)
1022                                                 {
1023                                                 struct sctp_rcvinfo *rcvinfo;
1024
1025                                                 rcvinfo = (struct sctp_rcvinfo *)CMSG_DATA(cmsg);
1026                                                 data->rcvinfo.rcv_sid = rcvinfo->rcv_sid;
1027                                                 data->rcvinfo.rcv_ssn = rcvinfo->rcv_ssn;
1028                                                 data->rcvinfo.rcv_flags = rcvinfo->rcv_flags;
1029                                                 data->rcvinfo.rcv_ppid = rcvinfo->rcv_ppid;
1030                                                 data->rcvinfo.rcv_tsn = rcvinfo->rcv_tsn;
1031                                                 data->rcvinfo.rcv_cumtsn = rcvinfo->rcv_cumtsn;
1032                                                 data->rcvinfo.rcv_context = rcvinfo->rcv_context;
1033                                                 }
1034 #endif
1035 #ifdef SCTP_SNDRCV
1036                                         if (cmsg->cmsg_type == SCTP_SNDRCV)
1037                                                 {
1038                                                 struct sctp_sndrcvinfo *sndrcvinfo;
1039
1040                                                 sndrcvinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
1041                                                 data->rcvinfo.rcv_sid = sndrcvinfo->sinfo_stream;
1042                                                 data->rcvinfo.rcv_ssn = sndrcvinfo->sinfo_ssn;
1043                                                 data->rcvinfo.rcv_flags = sndrcvinfo->sinfo_flags;
1044                                                 data->rcvinfo.rcv_ppid = sndrcvinfo->sinfo_ppid;
1045                                                 data->rcvinfo.rcv_tsn = sndrcvinfo->sinfo_tsn;
1046                                                 data->rcvinfo.rcv_cumtsn = sndrcvinfo->sinfo_cumtsn;
1047                                                 data->rcvinfo.rcv_context = sndrcvinfo->sinfo_context;
1048                                                 }
1049 #endif
1050                                         }
1051                                 }
1052
1053                         if (n <= 0)
1054                                 {
1055                                 if (n < 0)
1056                                         ret = n;
1057                                 break;
1058                                 }
1059
1060                         if (msg.msg_flags & MSG_NOTIFICATION)
1061                                 {
1062                                 snp = (union sctp_notification*) out;
1063                                 if (snp->sn_header.sn_type == SCTP_SENDER_DRY_EVENT)
1064                                         {
1065 #ifdef SCTP_EVENT
1066                                         struct sctp_event event;
1067 #else
1068                                         struct sctp_event_subscribe event;
1069                                         socklen_t eventsize;
1070 #endif
1071                                         /* If a message has been delayed until the socket
1072                                          * is dry, it can be sent now.
1073                                          */
1074                                         if (data->saved_message.length > 0)
1075                                                 {
1076                                                 dgram_sctp_write(data->saved_message.bio, data->saved_message.data,
1077                                                                  data->saved_message.length);
1078                                                 OPENSSL_free(data->saved_message.data);
1079                                                 data->saved_message.length = 0;
1080                                                 }
1081
1082                                         /* disable sender dry event */
1083 #ifdef SCTP_EVENT
1084                                         memset(&event, 0, sizeof(struct sctp_event));
1085                                         event.se_assoc_id = 0;
1086                                         event.se_type = SCTP_SENDER_DRY_EVENT;
1087                                         event.se_on = 0;
1088                                         i = setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENT, &event, sizeof(struct sctp_event));
1089                                         OPENSSL_assert(i >= 0);
1090 #else
1091                                         eventsize = sizeof(struct sctp_event_subscribe);
1092                                         i = getsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event, &eventsize);
1093                                         OPENSSL_assert(i >= 0);
1094
1095                                         event.sctp_sender_dry_event = 0;
1096
1097                                         i = setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event, sizeof(struct sctp_event_subscribe));
1098                                         OPENSSL_assert(i >= 0);
1099 #endif
1100                                         }
1101
1102 #ifdef SCTP_AUTHENTICATION_EVENT
1103                                 if (snp->sn_header.sn_type == SCTP_AUTHENTICATION_EVENT)
1104                                         dgram_sctp_handle_auth_free_key_event(b, snp);
1105 #endif
1106
1107                                 if (data->handle_notifications != NULL)
1108                                         data->handle_notifications(b, data->notification_context, (void*) out);
1109
1110                                 memset(out, 0, outl);
1111                                 }
1112                         else
1113                                 ret += n;
1114                         }
1115                 while ((msg.msg_flags & MSG_NOTIFICATION) && (msg.msg_flags & MSG_EOR) && (ret < outl));
1116
1117                 if (ret > 0 && !(msg.msg_flags & MSG_EOR))
1118                         {
1119                         /* Partial message read, this should never happen! */
1120
1121                         /* The buffer was too small, this means the peer sent
1122                          * a message that was larger than allowed. */
1123                         if (ret == outl)
1124                                 return -1;
1125
1126                         /* Test if socket buffer can handle max record
1127                          * size (2^14 + 2048 + 13)
1128                          */
1129                         optlen = (socklen_t) sizeof(int);
1130                         ret = getsockopt(b->num, SOL_SOCKET, SO_RCVBUF, &optval, &optlen);
1131                         OPENSSL_assert(ret >= 0);
1132                         OPENSSL_assert(optval >= 18445);
1133
1134                         /* Test if SCTP doesn't partially deliver below
1135                          * max record size (2^14 + 2048 + 13)
1136                          */
1137                         optlen = (socklen_t) sizeof(int);
1138                         ret = getsockopt(b->num, IPPROTO_SCTP, SCTP_PARTIAL_DELIVERY_POINT,
1139                                          &optval, &optlen);
1140                         OPENSSL_assert(ret >= 0);
1141                         OPENSSL_assert(optval >= 18445);
1142
1143                         /* Partially delivered notification??? Probably a bug.... */
1144                         OPENSSL_assert(!(msg.msg_flags & MSG_NOTIFICATION));
1145
1146                         /* Everything seems ok till now, so it's most likely
1147                          * a message dropped by PR-SCTP.
1148                          */
1149                         memset(out, 0, outl);
1150                         BIO_set_retry_read(b);
1151                         return -1;
1152                         }
1153
1154                 BIO_clear_retry_flags(b);
1155                 if (ret < 0)
1156                         {
1157                         if (BIO_dgram_should_retry(ret))
1158                                 {
1159                                 BIO_set_retry_read(b);
1160                                 data->_errno = get_last_socket_error();
1161                                 }
1162                         }
1163
1164                 /* Test if peer uses SCTP-AUTH before continuing */
1165                 if (!data->peer_auth_tested)
1166                         {
1167                         int ii, auth_data = 0, auth_forward = 0;
1168                         unsigned char *p;
1169                         struct sctp_authchunks *authchunks;
1170
1171                         optlen = (socklen_t)(sizeof(sctp_assoc_t) + 256 * sizeof(uint8_t));
1172                         authchunks = OPENSSL_malloc(optlen);
1173                         memset(authchunks, 0, sizeof(optlen));
1174                         ii = getsockopt(b->num, IPPROTO_SCTP, SCTP_PEER_AUTH_CHUNKS, authchunks, &optlen);
1175                         OPENSSL_assert(ii >= 0);
1176
1177                         for (p = (unsigned char*) authchunks + sizeof(sctp_assoc_t);
1178                                  p < (unsigned char*) authchunks + optlen;
1179                                  p += sizeof(uint8_t))
1180                                 {
1181                                 if (*p == OPENSSL_SCTP_DATA_CHUNK_TYPE) auth_data = 1;
1182                                 if (*p == OPENSSL_SCTP_FORWARD_CUM_TSN_CHUNK_TYPE) auth_forward = 1;
1183                                 }
1184
1185                         OPENSSL_free(authchunks);
1186
1187                         if (!auth_data || !auth_forward)
1188                                 {
1189                                 BIOerr(BIO_F_DGRAM_SCTP_READ,BIO_R_CONNECT_ERROR);
1190                                 return -1;
1191                                 }
1192
1193                         data->peer_auth_tested = 1;
1194                         }
1195                 }
1196         return(ret);
1197         }
1198
1199 static int dgram_sctp_write(BIO *b, const char *in, int inl)
1200         {
1201         int ret;
1202         bio_dgram_sctp_data *data = (bio_dgram_sctp_data *)b->ptr;
1203         struct bio_dgram_sctp_sndinfo *sinfo = &(data->sndinfo);
1204         struct bio_dgram_sctp_prinfo *pinfo = &(data->prinfo);
1205         struct bio_dgram_sctp_sndinfo handshake_sinfo;
1206         struct iovec iov[1];
1207         struct msghdr msg;
1208         struct cmsghdr *cmsg;
1209 #if defined(SCTP_SNDINFO) && defined(SCTP_PRINFO)
1210         char cmsgbuf[CMSG_SPACE(sizeof(struct sctp_sndinfo)) + CMSG_SPACE(sizeof(struct sctp_prinfo))];
1211         struct sctp_sndinfo *sndinfo;
1212         struct sctp_prinfo *prinfo;
1213 #else
1214         char cmsgbuf[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))];
1215         struct sctp_sndrcvinfo *sndrcvinfo;
1216 #endif
1217
1218         clear_socket_error();
1219
1220         /* If we're send anything else than application data,
1221          * disable all user parameters and flags.
1222          */
1223         if (in[0] != 23) {
1224                 memset(&handshake_sinfo, 0x00, sizeof(struct bio_dgram_sctp_sndinfo));
1225 #ifdef SCTP_SACK_IMMEDIATELY
1226                 handshake_sinfo.snd_flags = SCTP_SACK_IMMEDIATELY;
1227 #endif
1228                 sinfo = &handshake_sinfo;
1229         }
1230
1231         /* If we have to send a shutdown alert message and the
1232          * socket is not dry yet, we have to save it and send it
1233          * as soon as the socket gets dry.
1234          */
1235         if (data->save_shutdown && !BIO_dgram_sctp_wait_for_dry(b))
1236         {
1237                 data->saved_message.bio = b;
1238                 data->saved_message.length = inl;
1239                 data->saved_message.data = OPENSSL_malloc(inl);
1240                 memcpy(data->saved_message.data, in, inl);
1241                 return inl;
1242         }
1243
1244         iov[0].iov_base = (char *)in;
1245         iov[0].iov_len = inl;
1246         msg.msg_name = NULL;
1247         msg.msg_namelen = 0;
1248         msg.msg_iov = iov;
1249         msg.msg_iovlen = 1;
1250         msg.msg_control = (caddr_t)cmsgbuf;
1251         msg.msg_controllen = 0;
1252         msg.msg_flags = 0;
1253 #if defined(SCTP_SNDINFO) && defined(SCTP_PRINFO)
1254         cmsg = (struct cmsghdr *)cmsgbuf;
1255         cmsg->cmsg_level = IPPROTO_SCTP;
1256         cmsg->cmsg_type = SCTP_SNDINFO;
1257         cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndinfo));
1258         sndinfo = (struct sctp_sndinfo *)CMSG_DATA(cmsg);
1259         memset(sndinfo, 0, sizeof(struct sctp_sndinfo));
1260         sndinfo->snd_sid = sinfo->snd_sid;
1261         sndinfo->snd_flags = sinfo->snd_flags;
1262         sndinfo->snd_ppid = sinfo->snd_ppid;
1263         sndinfo->snd_context = sinfo->snd_context;
1264         msg.msg_controllen += CMSG_SPACE(sizeof(struct sctp_sndinfo));
1265
1266         cmsg = (struct cmsghdr *)&cmsgbuf[CMSG_SPACE(sizeof(struct sctp_sndinfo))];
1267         cmsg->cmsg_level = IPPROTO_SCTP;
1268         cmsg->cmsg_type = SCTP_PRINFO;
1269         cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_prinfo));
1270         prinfo = (struct sctp_prinfo *)CMSG_DATA(cmsg);
1271         memset(prinfo, 0, sizeof(struct sctp_prinfo));
1272         prinfo->pr_policy = pinfo->pr_policy;
1273         prinfo->pr_value = pinfo->pr_value;
1274         msg.msg_controllen += CMSG_SPACE(sizeof(struct sctp_prinfo));
1275 #else
1276         cmsg = (struct cmsghdr *)cmsgbuf;
1277         cmsg->cmsg_level = IPPROTO_SCTP;
1278         cmsg->cmsg_type = SCTP_SNDRCV;
1279         cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo));
1280         sndrcvinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
1281         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
1282         sndrcvinfo->sinfo_stream = sinfo->snd_sid;
1283         sndrcvinfo->sinfo_flags = sinfo->snd_flags;
1284 #ifdef __FreeBSD__
1285         sndrcvinfo->sinfo_flags |= pinfo->pr_policy;
1286 #endif
1287         sndrcvinfo->sinfo_ppid = sinfo->snd_ppid;
1288         sndrcvinfo->sinfo_context = sinfo->snd_context;
1289         sndrcvinfo->sinfo_timetolive = pinfo->pr_value;
1290         msg.msg_controllen += CMSG_SPACE(sizeof(struct sctp_sndrcvinfo));
1291 #endif
1292
1293         ret = sendmsg(b->num, &msg, 0);
1294
1295         BIO_clear_retry_flags(b);
1296         if (ret <= 0)
1297                 {
1298                 if (BIO_dgram_should_retry(ret))
1299                         {
1300                         BIO_set_retry_write(b);
1301                         data->_errno = get_last_socket_error();
1302                         }
1303                 }
1304         return(ret);
1305         }
1306
1307 static long dgram_sctp_ctrl(BIO *b, int cmd, long num, void *ptr)
1308         {
1309         long ret=1;
1310         bio_dgram_sctp_data *data = NULL;
1311         unsigned int sockopt_len = 0;
1312         struct sctp_authkeyid authkeyid;
1313         struct sctp_authkey *authkey;
1314
1315         data = (bio_dgram_sctp_data *)b->ptr;
1316
1317         switch (cmd)
1318                 {
1319         case BIO_CTRL_DGRAM_QUERY_MTU:
1320                 /* Set to maximum (2^14)
1321                  * and ignore user input to enable transport
1322                  * protocol fragmentation.
1323                  * Returns always 2^14.
1324                  */
1325                 data->mtu = 16384;
1326                 ret = data->mtu;
1327                 break;
1328         case BIO_CTRL_DGRAM_SET_MTU:
1329                 /* Set to maximum (2^14)
1330                  * and ignore input to enable transport
1331                  * protocol fragmentation.
1332                  * Returns always 2^14.
1333                  */
1334                 data->mtu = 16384;
1335                 ret = data->mtu;
1336                 break;
1337         case BIO_CTRL_DGRAM_SET_CONNECTED:
1338         case BIO_CTRL_DGRAM_CONNECT:
1339                 /* Returns always -1. */
1340                 ret = -1;
1341                 break;
1342         case BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT:
1343                 /* SCTP doesn't need the DTLS timer
1344                  * Returns always 1.
1345                  */
1346                 break;
1347         case BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE:
1348                 if (num > 0)
1349                         data->in_handshake = 1;
1350                 else
1351                         data->in_handshake = 0;
1352
1353                 ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_NODELAY, &data->in_handshake, sizeof(int));
1354                 break;
1355         case BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY:
1356                 /* New shared key for SCTP AUTH.
1357                  * Returns 0 on success, -1 otherwise.
1358                  */
1359
1360                 /* Get active key */
1361                 sockopt_len = sizeof(struct sctp_authkeyid);
1362                 ret = getsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY, &authkeyid, &sockopt_len);
1363                 if (ret < 0) break;
1364
1365                 /* Add new key */
1366                 sockopt_len = sizeof(struct sctp_authkey) + 64 * sizeof(uint8_t);
1367                 authkey = OPENSSL_malloc(sockopt_len);
1368                 memset(authkey, 0x00, sockopt_len);
1369                 authkey->sca_keynumber = authkeyid.scact_keynumber + 1;
1370 #ifndef __FreeBSD__
1371                 /* This field is missing in FreeBSD 8.2 and earlier,
1372                  * and FreeBSD 8.3 and higher work without it.
1373                  */
1374                 authkey->sca_keylength = 64;
1375 #endif
1376                 memcpy(&authkey->sca_key[0], ptr, 64 * sizeof(uint8_t));
1377
1378                 ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_KEY, authkey, sockopt_len);
1379                 if (ret < 0) break;
1380
1381                 /* Reset active key */
1382                 ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY,
1383                       &authkeyid, sizeof(struct sctp_authkeyid));
1384                 if (ret < 0) break;
1385
1386                 break;
1387         case BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY:
1388                 /* Returns 0 on success, -1 otherwise. */
1389
1390                 /* Get active key */
1391                 sockopt_len = sizeof(struct sctp_authkeyid);
1392                 ret = getsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY, &authkeyid, &sockopt_len);
1393                 if (ret < 0) break;
1394
1395                 /* Set active key */
1396                 authkeyid.scact_keynumber = authkeyid.scact_keynumber + 1;
1397                 ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY,
1398                       &authkeyid, sizeof(struct sctp_authkeyid));
1399                 if (ret < 0) break;
1400
1401                 /* CCS has been sent, so remember that and fall through
1402                  * to check if we need to deactivate an old key
1403                  */
1404                 data->ccs_sent = 1;
1405
1406         case BIO_CTRL_DGRAM_SCTP_AUTH_CCS_RCVD:
1407                 /* Returns 0 on success, -1 otherwise. */
1408
1409                 /* Has this command really been called or is this just a fall-through? */
1410                 if (cmd == BIO_CTRL_DGRAM_SCTP_AUTH_CCS_RCVD)
1411                         data->ccs_rcvd = 1;
1412
1413                 /* CSS has been both, received and sent, so deactivate an old key */
1414                 if (data->ccs_rcvd == 1 && data->ccs_sent == 1)
1415                         {
1416                         /* Get active key */
1417                         sockopt_len = sizeof(struct sctp_authkeyid);
1418                         ret = getsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY, &authkeyid, &sockopt_len);
1419                         if (ret < 0) break;
1420
1421                         /* Deactivate key or delete second last key if
1422                          * SCTP_AUTHENTICATION_EVENT is not available.
1423                          */
1424                         authkeyid.scact_keynumber = authkeyid.scact_keynumber - 1;
1425 #ifdef SCTP_AUTH_DEACTIVATE_KEY
1426                         sockopt_len = sizeof(struct sctp_authkeyid);
1427                         ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_DEACTIVATE_KEY,
1428                               &authkeyid, sockopt_len);
1429                         if (ret < 0) break;
1430 #endif
1431 #ifndef SCTP_AUTHENTICATION_EVENT
1432                         if (authkeyid.scact_keynumber > 0)
1433                                 {
1434                                 authkeyid.scact_keynumber = authkeyid.scact_keynumber - 1;
1435                                 ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_DELETE_KEY,
1436                                           &authkeyid, sizeof(struct sctp_authkeyid));
1437                                 if (ret < 0) break;
1438                                 }
1439 #endif
1440
1441                         data->ccs_rcvd = 0;
1442                         data->ccs_sent = 0;
1443                         }
1444                 break;
1445         case BIO_CTRL_DGRAM_SCTP_GET_SNDINFO:
1446                 /* Returns the size of the copied struct. */
1447                 if (num > (long) sizeof(struct bio_dgram_sctp_sndinfo))
1448                         num = sizeof(struct bio_dgram_sctp_sndinfo);
1449
1450                 memcpy(ptr, &(data->sndinfo), num);
1451                 ret = num;
1452                 break;
1453         case BIO_CTRL_DGRAM_SCTP_SET_SNDINFO:
1454                 /* Returns the size of the copied struct. */
1455                 if (num > (long) sizeof(struct bio_dgram_sctp_sndinfo))
1456                         num = sizeof(struct bio_dgram_sctp_sndinfo);
1457
1458                 memcpy(&(data->sndinfo), ptr, num);
1459                 break;
1460         case BIO_CTRL_DGRAM_SCTP_GET_RCVINFO:
1461                 /* Returns the size of the copied struct. */
1462                 if (num > (long) sizeof(struct bio_dgram_sctp_rcvinfo))
1463                         num = sizeof(struct bio_dgram_sctp_rcvinfo);
1464
1465                 memcpy(ptr, &data->rcvinfo, num);
1466
1467                 ret = num;
1468                 break;
1469         case BIO_CTRL_DGRAM_SCTP_SET_RCVINFO:
1470                 /* Returns the size of the copied struct. */
1471                 if (num > (long) sizeof(struct bio_dgram_sctp_rcvinfo))
1472                         num = sizeof(struct bio_dgram_sctp_rcvinfo);
1473
1474                 memcpy(&(data->rcvinfo), ptr, num);
1475                 break;
1476         case BIO_CTRL_DGRAM_SCTP_GET_PRINFO:
1477                 /* Returns the size of the copied struct. */
1478                 if (num > (long) sizeof(struct bio_dgram_sctp_prinfo))
1479                         num = sizeof(struct bio_dgram_sctp_prinfo);
1480
1481                 memcpy(ptr, &(data->prinfo), num);
1482                 ret = num;
1483                 break;
1484         case BIO_CTRL_DGRAM_SCTP_SET_PRINFO:
1485                 /* Returns the size of the copied struct. */
1486                 if (num > (long) sizeof(struct bio_dgram_sctp_prinfo))
1487                         num = sizeof(struct bio_dgram_sctp_prinfo);
1488
1489                 memcpy(&(data->prinfo), ptr, num);
1490                 break;
1491         case BIO_CTRL_DGRAM_SCTP_SAVE_SHUTDOWN:
1492                 /* Returns always 1. */
1493                 if (num > 0)
1494                         data->save_shutdown = 1;
1495                 else
1496                         data->save_shutdown = 0;
1497                 break;
1498
1499         default:
1500                 /* Pass to default ctrl function to
1501                  * process SCTP unspecific commands
1502                  */
1503                 ret=dgram_ctrl(b, cmd, num, ptr);
1504                 break;
1505                 }
1506         return(ret);
1507         }
1508
1509 int BIO_dgram_sctp_notification_cb(BIO *b,
1510                                    void (*handle_notifications)(BIO *bio, void *context, void *buf),
1511                                    void *context)
1512         {
1513         bio_dgram_sctp_data *data = (bio_dgram_sctp_data *) b->ptr;
1514
1515         if (handle_notifications != NULL)
1516                 {
1517                 data->handle_notifications = handle_notifications;
1518                 data->notification_context = context;
1519                 }
1520         else
1521                 return -1;
1522
1523         return 0;
1524         }
1525
1526 int BIO_dgram_sctp_wait_for_dry(BIO *b)
1527 {
1528         int is_dry = 0;
1529         int n, sockflags, ret;
1530         union sctp_notification snp;
1531         struct msghdr msg;
1532         struct iovec iov;
1533 #ifdef SCTP_EVENT
1534         struct sctp_event event;
1535 #else
1536         struct sctp_event_subscribe event;
1537         socklen_t eventsize;
1538 #endif
1539         bio_dgram_sctp_data *data = (bio_dgram_sctp_data *)b->ptr;
1540
1541         /* set sender dry event */
1542 #ifdef SCTP_EVENT
1543         memset(&event, 0, sizeof(struct sctp_event));
1544         event.se_assoc_id = 0;
1545         event.se_type = SCTP_SENDER_DRY_EVENT;
1546         event.se_on = 1;
1547         ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENT, &event, sizeof(struct sctp_event));
1548 #else
1549         eventsize = sizeof(struct sctp_event_subscribe);
1550         ret = getsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event, &eventsize);
1551         if (ret < 0)
1552                 return -1;
1553
1554         event.sctp_sender_dry_event = 1;
1555
1556         ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event, sizeof(struct sctp_event_subscribe));
1557 #endif
1558         if (ret < 0)
1559                 return -1;
1560
1561         /* peek for notification */
1562         memset(&snp, 0x00, sizeof(union sctp_notification));
1563         iov.iov_base = (char *)&snp;
1564         iov.iov_len = sizeof(union sctp_notification);
1565         msg.msg_name = NULL;
1566         msg.msg_namelen = 0;
1567         msg.msg_iov = &iov;
1568         msg.msg_iovlen = 1;
1569         msg.msg_control = NULL;
1570         msg.msg_controllen = 0;
1571         msg.msg_flags = 0;
1572
1573         n = recvmsg(b->num, &msg, MSG_PEEK);
1574         if (n <= 0)
1575                 {
1576                 if ((n < 0) && (get_last_socket_error() != EAGAIN) && (get_last_socket_error() != EWOULDBLOCK))
1577                         return -1;
1578                 else
1579                         return 0;
1580                 }
1581
1582         /* if we find a notification, process it and try again if necessary */
1583         while (msg.msg_flags & MSG_NOTIFICATION)
1584                 {
1585                 memset(&snp, 0x00, sizeof(union sctp_notification));
1586                 iov.iov_base = (char *)&snp;
1587                 iov.iov_len = sizeof(union sctp_notification);
1588                 msg.msg_name = NULL;
1589                 msg.msg_namelen = 0;
1590                 msg.msg_iov = &iov;
1591                 msg.msg_iovlen = 1;
1592                 msg.msg_control = NULL;
1593                 msg.msg_controllen = 0;
1594                 msg.msg_flags = 0;
1595
1596                 n = recvmsg(b->num, &msg, 0);
1597                 if (n <= 0)
1598                         {
1599                         if ((n < 0) && (get_last_socket_error() != EAGAIN) && (get_last_socket_error() != EWOULDBLOCK))
1600                                 return -1;
1601                         else
1602                                 return is_dry;
1603                         }
1604
1605                 if (snp.sn_header.sn_type == SCTP_SENDER_DRY_EVENT)
1606                         {
1607                         is_dry = 1;
1608
1609                         /* disable sender dry event */
1610 #ifdef SCTP_EVENT
1611                         memset(&event, 0, sizeof(struct sctp_event));
1612                         event.se_assoc_id = 0;
1613                         event.se_type = SCTP_SENDER_DRY_EVENT;
1614                         event.se_on = 0;
1615                         ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENT, &event, sizeof(struct sctp_event));
1616 #else
1617                         eventsize = (socklen_t) sizeof(struct sctp_event_subscribe);
1618                         ret = getsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event, &eventsize);
1619                         if (ret < 0)
1620                                 return -1;
1621
1622                         event.sctp_sender_dry_event = 0;
1623
1624                         ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event, sizeof(struct sctp_event_subscribe));
1625 #endif
1626                         if (ret < 0)
1627                                 return -1;
1628                         }
1629
1630 #ifdef SCTP_AUTHENTICATION_EVENT
1631                 if (snp.sn_header.sn_type == SCTP_AUTHENTICATION_EVENT)
1632                         dgram_sctp_handle_auth_free_key_event(b, &snp);
1633 #endif
1634
1635                 if (data->handle_notifications != NULL)
1636                         data->handle_notifications(b, data->notification_context, (void*) &snp);
1637
1638                 /* found notification, peek again */
1639                 memset(&snp, 0x00, sizeof(union sctp_notification));
1640                 iov.iov_base = (char *)&snp;
1641                 iov.iov_len = sizeof(union sctp_notification);
1642                 msg.msg_name = NULL;
1643                 msg.msg_namelen = 0;
1644                 msg.msg_iov = &iov;
1645                 msg.msg_iovlen = 1;
1646                 msg.msg_control = NULL;
1647                 msg.msg_controllen = 0;
1648                 msg.msg_flags = 0;
1649
1650                 /* if we have seen the dry already, don't wait */
1651                 if (is_dry)
1652                         {
1653                         sockflags = fcntl(b->num, F_GETFL, 0);
1654                         fcntl(b->num, F_SETFL, O_NONBLOCK);
1655                         }
1656
1657                 n = recvmsg(b->num, &msg, MSG_PEEK);
1658
1659                 if (is_dry)
1660                         {
1661                         fcntl(b->num, F_SETFL, sockflags);
1662                         }
1663
1664                 if (n <= 0)
1665                         {
1666                         if ((n < 0) && (get_last_socket_error() != EAGAIN) && (get_last_socket_error() != EWOULDBLOCK))
1667                                 return -1;
1668                         else
1669                                 return is_dry;
1670                         }
1671                 }
1672
1673         /* read anything else */
1674         return is_dry;
1675 }
1676
1677 int BIO_dgram_sctp_msg_waiting(BIO *b)
1678         {
1679         int n, sockflags;
1680         union sctp_notification snp;
1681         struct msghdr msg;
1682         struct iovec iov;
1683         bio_dgram_sctp_data *data = (bio_dgram_sctp_data *)b->ptr;
1684
1685         /* Check if there are any messages waiting to be read */
1686         do
1687                 {
1688                 memset(&snp, 0x00, sizeof(union sctp_notification));
1689                 iov.iov_base = (char *)&snp;
1690                 iov.iov_len = sizeof(union sctp_notification);
1691                 msg.msg_name = NULL;
1692                 msg.msg_namelen = 0;
1693                 msg.msg_iov = &iov;
1694                 msg.msg_iovlen = 1;
1695                 msg.msg_control = NULL;
1696                 msg.msg_controllen = 0;
1697                 msg.msg_flags = 0;
1698
1699                 sockflags = fcntl(b->num, F_GETFL, 0);
1700                 fcntl(b->num, F_SETFL, O_NONBLOCK);
1701                 n = recvmsg(b->num, &msg, MSG_PEEK);
1702                 fcntl(b->num, F_SETFL, sockflags);
1703
1704                 /* if notification, process and try again */
1705                 if (n > 0 && (msg.msg_flags & MSG_NOTIFICATION))
1706                         {
1707 #ifdef SCTP_AUTHENTICATION_EVENT
1708                         if (snp.sn_header.sn_type == SCTP_AUTHENTICATION_EVENT)
1709                                 dgram_sctp_handle_auth_free_key_event(b, &snp);
1710 #endif
1711
1712                         memset(&snp, 0x00, sizeof(union sctp_notification));
1713                         iov.iov_base = (char *)&snp;
1714                         iov.iov_len = sizeof(union sctp_notification);
1715                         msg.msg_name = NULL;
1716                         msg.msg_namelen = 0;
1717                         msg.msg_iov = &iov;
1718                         msg.msg_iovlen = 1;
1719                         msg.msg_control = NULL;
1720                         msg.msg_controllen = 0;
1721                         msg.msg_flags = 0;
1722                         n = recvmsg(b->num, &msg, 0);
1723
1724                         if (data->handle_notifications != NULL)
1725                                 data->handle_notifications(b, data->notification_context, (void*) &snp);
1726                         }
1727
1728                 } while (n > 0 && (msg.msg_flags & MSG_NOTIFICATION));
1729
1730         /* Return 1 if there is a message to be read, return 0 otherwise. */
1731         if (n > 0)
1732                 return 1;
1733         else
1734                 return 0;
1735         }
1736
1737 static int dgram_sctp_puts(BIO *bp, const char *str)
1738         {
1739         int n,ret;
1740
1741         n=strlen(str);
1742         ret=dgram_sctp_write(bp,str,n);
1743         return(ret);
1744         }
1745 #endif
1746
1747 static int BIO_dgram_should_retry(int i)
1748         {
1749         int err;
1750
1751         if ((i == 0) || (i == -1))
1752                 {
1753                 err=get_last_socket_error();
1754
1755 #if defined(OPENSSL_SYS_WINDOWS)
1756         /* If the socket return value (i) is -1
1757          * and err is unexpectedly 0 at this point,
1758          * the error code was overwritten by
1759          * another system call before this error
1760          * handling is called.
1761          */
1762 #endif
1763
1764                 return(BIO_dgram_non_fatal_error(err));
1765                 }
1766         return(0);
1767         }
1768
1769 int BIO_dgram_non_fatal_error(int err)
1770         {
1771         switch (err)
1772                 {
1773 #if defined(OPENSSL_SYS_WINDOWS)
1774 # if defined(WSAEWOULDBLOCK)
1775         case WSAEWOULDBLOCK:
1776 # endif
1777
1778 # if 0 /* This appears to always be an error */
1779 #  if defined(WSAENOTCONN)
1780         case WSAENOTCONN:
1781 #  endif
1782 # endif
1783 #endif
1784
1785 #ifdef EWOULDBLOCK
1786 # ifdef WSAEWOULDBLOCK
1787 #  if WSAEWOULDBLOCK != EWOULDBLOCK
1788         case EWOULDBLOCK:
1789 #  endif
1790 # else
1791         case EWOULDBLOCK:
1792 # endif
1793 #endif
1794
1795 #ifdef EINTR
1796         case EINTR:
1797 #endif
1798
1799 #ifdef EAGAIN
1800 #if EWOULDBLOCK != EAGAIN
1801         case EAGAIN:
1802 # endif
1803 #endif
1804
1805 #ifdef EPROTO
1806         case EPROTO:
1807 #endif
1808
1809 #ifdef EINPROGRESS
1810         case EINPROGRESS:
1811 #endif
1812
1813 #ifdef EALREADY
1814         case EALREADY:
1815 #endif
1816
1817                 return(1);
1818                 /* break; */
1819         default:
1820                 break;
1821                 }
1822         return(0);
1823         }
1824
1825 static void get_current_time(struct timeval *t)
1826         {
1827 #ifdef OPENSSL_SYS_WIN32
1828         struct _timeb tb;
1829         _ftime(&tb);
1830         t->tv_sec = (long)tb.time;
1831         t->tv_usec = (long)tb.millitm * 1000;
1832 #elif defined(OPENSSL_SYS_VMS)
1833         struct timeb tb;
1834         ftime(&tb);
1835         t->tv_sec = (long)tb.time;
1836         t->tv_usec = (long)tb.millitm * 1000;
1837 #else
1838         gettimeofday(t, NULL);
1839 #endif
1840         }
1841
1842 #endif