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_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 #if defined(OPENSSL_SYS_LINUX) && !defined(IP_MTU)
  81 #define IP_MTU      14 /* linux is lame */
  82 #endif
  83
  84 #if OPENSSL_USE_IPV6 && !defined(IPPROTO_IPV6)
  85 #define IPPROTO_IPV6 41 /* windows is lame */
  86 #endif
  87
  88 #if defined(__FreeBSD__) && defined(IN6_IS_ADDR_V4MAPPED)
  89 /* Standard definition causes type-punning problems. */
  90 #undef IN6_IS_ADDR_V4MAPPED
  91 #define s6_addr32 __u6_addr.__u6_addr32
  92 #define IN6_IS_ADDR_V4MAPPED(a)               \
  93         (((a)->s6_addr32[0] == 0) &&          \
  94          ((a)->s6_addr32[1] == 0) &&          \
  95          ((a)->s6_addr32[2] == htonl(0x0000ffff)))
  96 #endif
  97
  98 #ifdef WATT32
  99 #define sock_write SockWrite  /* Watt-32 uses same names */
 100 #define sock_read  SockRead
 101 #define sock_puts  SockPuts
 102 #endif
 103
 104 static int dgram_write(BIO *h, const char *buf, int num);
 105 static int dgram_read(BIO *h, char *buf, int size);
 106 static int dgram_puts(BIO *h, const char *str);
 107 static long dgram_ctrl(BIO *h, int cmd, long arg1, void *arg2);
 108 static int dgram_new(BIO *h);
 109 static int dgram_free(BIO *data);
 110 static int dgram_clear(BIO *bio);
 111
 112 #ifndef OPENSSL_NO_SCTP
 113 static int dgram_sctp_write(BIO *h, const char *buf, int num);
 114 static int dgram_sctp_read(BIO *h, char *buf, int size);
 115 static int dgram_sctp_puts(BIO *h, const char *str);
 116 static long dgram_sctp_ctrl(BIO *h, int cmd, long arg1, void *arg2);
 117 static int dgram_sctp_new(BIO *h);
 118 static int dgram_sctp_free(BIO *data);
 119 #ifdef SCTP_AUTHENTICATION_EVENT
 120 static void dgram_sctp_handle_auth_free_key_event(BIO *b, union sctp_notification *snp);
 121 #endif
 122 #endif
 123
 124 static int BIO_dgram_should_retry(int s);
 125
 126 static void get_current_time(struct timeval *t);
 127
 128 static BIO_METHOD methods_dgramp=
 129         {
 130         BIO_TYPE_DGRAM,
 131         "datagram socket",
 132         dgram_write,
 133         dgram_read,
 134         dgram_puts,
 135         NULL, /* dgram_gets, */
 136         dgram_ctrl,
 137         dgram_new,
 138         dgram_free,
 139         NULL,
 140         };
 141
 142 #ifndef OPENSSL_NO_SCTP
 143 static BIO_METHOD methods_dgramp_sctp=
 144         {
 145         BIO_TYPE_DGRAM_SCTP,
 146         "datagram sctp socket",
 147         dgram_sctp_write,
 148         dgram_sctp_read,
 149         dgram_sctp_puts,
 150         NULL, /* dgram_gets, */
 151         dgram_sctp_ctrl,
 152         dgram_sctp_new,
 153         dgram_sctp_free,
 154         NULL,
 155         };
 156 #endif
 157
 158 typedef struct bio_dgram_data_st
 159         {
 160         union {
 161                 struct sockaddr sa;
 162                 struct sockaddr_in sa_in;
 163 #if OPENSSL_USE_IPV6
 164                 struct sockaddr_in6 sa_in6;
 165 #endif
 166         } peer;
 167         unsigned int connected;
 168         unsigned int _errno;
 169         unsigned int mtu;
 170         struct timeval next_timeout;
 171         struct timeval socket_timeout;
 172         } bio_dgram_data;
 173
 174 #ifndef OPENSSL_NO_SCTP
 175 typedef struct bio_dgram_sctp_save_message_st
 176         {
 177         BIO *bio;
 178         char *data;
 179         int length;
 180         } bio_dgram_sctp_save_message;
 181
 182 typedef struct bio_dgram_sctp_data_st
 183         {
 184         union {
 185                 struct sockaddr sa;
 186                 struct sockaddr_in sa_in;
 187 #if OPENSSL_USE_IPV6
 188                 struct sockaddr_in6 sa_in6;
 189 #endif
 190         } peer;
 191         unsigned int connected;
 192         unsigned int _errno;
 193         unsigned int mtu;
 194         struct bio_dgram_sctp_sndinfo sndinfo;
 195         struct bio_dgram_sctp_rcvinfo rcvinfo;
 196         struct bio_dgram_sctp_prinfo prinfo;
 197         void (*handle_notifications)(BIO *bio, void *context, void *buf);
 198         void* notification_context;
 199         int in_handshake;
 200         int ccs_rcvd;
 201         int ccs_sent;
 202         int save_shutdown;
 203         int peer_auth_tested;
 204         bio_dgram_sctp_save_message saved_message;
 205         } bio_dgram_sctp_data;
 206 #endif
 207
 208 BIO_METHOD *BIO_s_datagram(void)
 209         {
 210         return(&methods_dgramp);
 211         }
 212
 213 BIO *BIO_new_dgram(int fd, int close_flag)
 214         {
 215         BIO *ret;
 216
 217         ret=BIO_new(BIO_s_datagram());
 218         if (ret == NULL) return(NULL);
 219         BIO_set_fd(ret,fd,close_flag);
 220         return(ret);
 221         }
 222
 223 static int dgram_new(BIO *bi)
 224         {
 225         bio_dgram_data *data = NULL;
 226
 227         bi->init=0;
 228         bi->num=0;
 229         data = OPENSSL_malloc(sizeof(bio_dgram_data));
 230         if (data == NULL)
 231                 return 0;
 232         memset(data, 0x00, sizeof(bio_dgram_data));
 233     bi->ptr = data;
 234
 235         bi->flags=0;
 236         return(1);
 237         }
 238
 239 static int dgram_free(BIO *a)
 240         {
 241         bio_dgram_data *data;
 242
 243         if (a == NULL) return(0);
 244         if ( ! dgram_clear(a))
 245                 return 0;
 246
 247         data = (bio_dgram_data *)a->ptr;
 248         if(data != NULL) OPENSSL_free(data);
 249
 250         return(1);
 251         }
 252
 253 static int dgram_clear(BIO *a)
 254         {
 255         if (a == NULL) return(0);
 256         if (a->shutdown)
 257                 {
 258                 if (a->init)
 259                         {
 260                         SHUTDOWN2(a->num);
 261                         }
 262                 a->init=0;
 263                 a->flags=0;
 264                 }
 265         return(1);
 266         }
 267
 268 static void dgram_adjust_rcv_timeout(BIO *b)
 269         {
 270 #if defined(SO_RCVTIMEO)
 271         bio_dgram_data *data = (bio_dgram_data *)b->ptr;
 272         union { size_t s; int i; } sz = {0};
 273
 274         /* Is a timer active? */
 275         if (data->next_timeout.tv_sec > 0 || data->next_timeout.tv_usec > 0)
 276                 {
 277                 struct timeval timenow, timeleft;
 278
 279                 /* Read current socket timeout */
 280 #ifdef OPENSSL_SYS_WINDOWS
 281                 int timeout;
 282
 283                 sz.i = sizeof(timeout);
 284                 if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 285                                            (void*)&timeout, &sz.i) < 0)
 286                         { perror("getsockopt"); }
 287                 else
 288                         {
 289                         data->socket_timeout.tv_sec = timeout / 1000;
 290                         data->socket_timeout.tv_usec = (timeout % 1000) * 1000;
 291                         }
 292 #else
 293                 sz.i = sizeof(data->socket_timeout);
 294                 if ( getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 295                                                 &(data->socket_timeout), (void *)&sz) < 0)
 296                         { perror("getsockopt"); }
 297                 else if (sizeof(sz.s)!=sizeof(sz.i) && sz.i==0)
 298                         OPENSSL_assert(sz.s<=sizeof(data->socket_timeout));
 299 #endif
 300
 301                 /* Get current time */
 302                 get_current_time(&timenow);
 303
 304                 /* Calculate time left until timer expires */
 305                 memcpy(&timeleft, &(data->next_timeout), sizeof(struct timeval));
 306                 timeleft.tv_sec -= timenow.tv_sec;
 307                 timeleft.tv_usec -= timenow.tv_usec;
 308                 if (timeleft.tv_usec < 0)
 309                         {
 310                         timeleft.tv_sec--;
 311                         timeleft.tv_usec += 1000000;
 312                         }
 313
 314                 if (timeleft.tv_sec < 0)
 315                         {
 316                         timeleft.tv_sec = 0;
 317                         timeleft.tv_usec = 1;
 318                         }
 319
 320                 /* Adjust socket timeout if next handhake message timer
 321                  * will expire earlier.
 322                  */
 323                 if ((data->socket_timeout.tv_sec == 0 && data->socket_timeout.tv_usec == 0) ||
 324                         (data->socket_timeout.tv_sec > timeleft.tv_sec) ||
 325                         (data->socket_timeout.tv_sec == timeleft.tv_sec &&
 326                          data->socket_timeout.tv_usec >= timeleft.tv_usec))
 327                         {
 328 #ifdef OPENSSL_SYS_WINDOWS
 329                         timeout = timeleft.tv_sec * 1000 + timeleft.tv_usec / 1000;
 330                         if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 331                                                    (void*)&timeout, sizeof(timeout)) < 0)
 332                                 { perror("setsockopt"); }
 333 #else
 334                         if ( setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, &timeleft,
 335                                                         sizeof(struct timeval)) < 0)
 336                                 { perror("setsockopt"); }
 337 #endif
 338                         }
 339                 }
 340 #endif
 341         }
 342
 343 static void dgram_reset_rcv_timeout(BIO *b)
 344         {
 345 #if defined(SO_RCVTIMEO)
 346         bio_dgram_data *data = (bio_dgram_data *)b->ptr;
 347
 348         /* Is a timer active? */
 349         if (data->next_timeout.tv_sec > 0 || data->next_timeout.tv_usec > 0)
 350                 {
 351 #ifdef OPENSSL_SYS_WINDOWS
 352                 int timeout = data->socket_timeout.tv_sec * 1000 +
 353                                           data->socket_timeout.tv_usec / 1000;
 354                 if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 355                                            (void*)&timeout, sizeof(timeout)) < 0)
 356                         { perror("setsockopt"); }
 357 #else
 358                 if ( setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, &(data->socket_timeout),
 359                                                 sizeof(struct timeval)) < 0)
 360                         { perror("setsockopt"); }
 361 #endif
 362                 }
 363 #endif
 364         }
 365
 366 static int dgram_read(BIO *b, char *out, int outl)
 367         {
 368         int ret=0;
 369         bio_dgram_data *data = (bio_dgram_data *)b->ptr;
 370
 371         struct  {
 372         /*
 373          * See commentary in b_sock.c. <appro>
 374          */
 375         union   { size_t s; int i; } len;
 376         union   {
 377                 struct sockaddr sa;
 378                 struct sockaddr_in sa_in;
 379 #if OPENSSL_USE_IPV6
 380                 struct sockaddr_in6 sa_in6;
 381 #endif
 382                 } peer;
 383         } sa;
 384
 385         sa.len.s=0;
 386         sa.len.i=sizeof(sa.peer);
 387
 388         if (out != NULL)
 389                 {
 390                 clear_socket_error();
 391                 memset(&sa.peer, 0x00, sizeof(sa.peer));
 392                 dgram_adjust_rcv_timeout(b);
 393                 ret=recvfrom(b->num,out,outl,0,&sa.peer.sa,(void *)&sa.len);
 394                 if (sizeof(sa.len.i)!=sizeof(sa.len.s) && sa.len.i==0)
 395                         {
 396                         OPENSSL_assert(sa.len.s<=sizeof(sa.peer));
 397                         sa.len.i = (int)sa.len.s;
 398                         }
 399
 400                 if ( ! data->connected  && ret >= 0)
 401                         BIO_ctrl(b, BIO_CTRL_DGRAM_SET_PEER, 0, &sa.peer);
 402
 403                 BIO_clear_retry_flags(b);
 404                 if (ret < 0)
 405                         {
 406                         if (BIO_dgram_should_retry(ret))
 407                                 {
 408                                 BIO_set_retry_read(b);
 409                                 data->_errno = get_last_socket_error();
 410                                 }
 411                         }
 412
 413                 dgram_reset_rcv_timeout(b);
 414                 }
 415         return(ret);
 416         }
 417
 418 static int dgram_write(BIO *b, const char *in, int inl)
 419         {
 420         int ret;
 421         bio_dgram_data *data = (bio_dgram_data *)b->ptr;
 422         clear_socket_error();
 423
 424         if ( data->connected )
 425                 ret=writesocket(b->num,in,inl);
 426         else
 427                 {
 428                 int peerlen = sizeof(data->peer);
 429
 430                 if (data->peer.sa.sa_family == AF_INET)
 431                         peerlen = sizeof(data->peer.sa_in);
 432 #if OPENSSL_USE_IPV6
 433                 else if (data->peer.sa.sa_family == AF_INET6)
 434                         peerlen = sizeof(data->peer.sa_in6);
 435 #endif
 436 #if defined(NETWARE_CLIB) && defined(NETWARE_BSDSOCK)
 437                 ret=sendto(b->num, (char *)in, inl, 0, &data->peer.sa, peerlen);
 438 #else
 439                 ret=sendto(b->num, in, inl, 0, &data->peer.sa, peerlen);
 440 #endif
 441                 }
 442
 443         BIO_clear_retry_flags(b);
 444         if (ret <= 0)
 445                 {
 446                 if (BIO_dgram_should_retry(ret))
 447                         {
 448                         BIO_set_retry_write(b);
 449                         data->_errno = get_last_socket_error();
 450
 451 #if 0 /* higher layers are responsible for querying MTU, if necessary */
 452                         if ( data->_errno == EMSGSIZE)
 453                                 /* retrieve the new MTU */
 454                                 BIO_ctrl(b, BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
 455 #endif
 456                         }
 457                 }
 458         return(ret);
 459         }
 460
 461 static long dgram_ctrl(BIO *b, int cmd, long num, void *ptr)
 462         {
 463         long ret=1;
 464         int *ip;
 465         struct sockaddr *to = NULL;
 466         bio_dgram_data *data = NULL;
 467         int sockopt_val = 0;
 468 #if defined(OPENSSL_SYS_LINUX) && (defined(IP_MTU_DISCOVER) || defined(IP_MTU))
 469         socklen_t sockopt_len;  /* assume that system supporting IP_MTU is
 470                                  * modern enough to define socklen_t */
 471         socklen_t addr_len;
 472         union   {
 473                 struct sockaddr sa;
 474                 struct sockaddr_in s4;
 475 #if OPENSSL_USE_IPV6
 476                 struct sockaddr_in6 s6;
 477 #endif
 478                 } addr;
 479 #endif
 480
 481         data = (bio_dgram_data *)b->ptr;
 482
 483         switch (cmd)
 484                 {
 485         case BIO_CTRL_RESET:
 486                 num=0;
 487         case BIO_C_FILE_SEEK:
 488                 ret=0;
 489                 break;
 490         case BIO_C_FILE_TELL:
 491         case BIO_CTRL_INFO:
 492                 ret=0;
 493                 break;
 494         case BIO_C_SET_FD:
 495                 dgram_clear(b);
 496                 b->num= *((int *)ptr);
 497                 b->shutdown=(int)num;
 498                 b->init=1;
 499                 break;
 500         case BIO_C_GET_FD:
 501                 if (b->init)
 502                         {
 503                         ip=(int *)ptr;
 504                         if (ip != NULL) *ip=b->num;
 505                         ret=b->num;
 506                         }
 507                 else
 508                         ret= -1;
 509                 break;
 510         case BIO_CTRL_GET_CLOSE:
 511                 ret=b->shutdown;
 512                 break;
 513         case BIO_CTRL_SET_CLOSE:
 514                 b->shutdown=(int)num;
 515                 break;
 516         case BIO_CTRL_PENDING:
 517         case BIO_CTRL_WPENDING:
 518                 ret=0;
 519                 break;
 520         case BIO_CTRL_DUP:
 521         case BIO_CTRL_FLUSH:
 522                 ret=1;
 523                 break;
 524         case BIO_CTRL_DGRAM_CONNECT:
 525                 to = (struct sockaddr *)ptr;
 526 #if 0
 527                 if (connect(b->num, to, sizeof(struct sockaddr)) < 0)
 528                         { perror("connect"); ret = 0; }
 529                 else
 530                         {
 531 #endif
 532                         switch (to->sa_family)
 533                                 {
 534                                 case AF_INET:
 535                                         memcpy(&data->peer,to,sizeof(data->peer.sa_in));
 536                                         break;
 537 #if OPENSSL_USE_IPV6
 538                                 case AF_INET6:
 539                                         memcpy(&data->peer,to,sizeof(data->peer.sa_in6));
 540                                         break;
 541 #endif
 542                                 default:
 543                                         memcpy(&data->peer,to,sizeof(data->peer.sa));
 544                                         break;
 545                                 }
 546 #if 0
 547                         }
 548 #endif
 549                 break;
 550                 /* (Linux)kernel sets DF bit on outgoing IP packets */
 551         case BIO_CTRL_DGRAM_MTU_DISCOVER:
 552 #if defined(OPENSSL_SYS_LINUX) && defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DO)
 553                 addr_len = (socklen_t)sizeof(addr);
 554                 memset((void *)&addr, 0, sizeof(addr));
 555                 if (getsockname(b->num, &addr.sa, &addr_len) < 0)
 556                         {
 557                         ret = 0;
 558                         break;
 559                         }
 560                 switch (addr.sa.sa_family)
 561                         {
 562                 case AF_INET:
 563                         sockopt_val = IP_PMTUDISC_DO;
 564                         if ((ret = setsockopt(b->num, IPPROTO_IP, IP_MTU_DISCOVER,
 565                                 &sockopt_val, sizeof(sockopt_val))) < 0)
 566                                 perror("setsockopt");
 567                         break;
 568 #if OPENSSL_USE_IPV6 && defined(IPV6_MTU_DISCOVER) && defined(IPV6_PMTUDISC_DO)
 569                 case AF_INET6:
 570                         sockopt_val = IPV6_PMTUDISC_DO;
 571                         if ((ret = setsockopt(b->num, IPPROTO_IPV6, IPV6_MTU_DISCOVER,
 572                                 &sockopt_val, sizeof(sockopt_val))) < 0)
 573                                 perror("setsockopt");
 574                         break;
 575 #endif
 576                 default:
 577                         ret = -1;
 578                         break;
 579                         }
 580                 ret = -1;
 581 #else
 582                 break;
 583 #endif
 584         case BIO_CTRL_DGRAM_QUERY_MTU:
 585 #if defined(OPENSSL_SYS_LINUX) && defined(IP_MTU)
 586                 addr_len = (socklen_t)sizeof(addr);
 587                 memset((void *)&addr, 0, sizeof(addr));
 588                 if (getsockname(b->num, &addr.sa, &addr_len) < 0)
 589                         {
 590                         ret = 0;
 591                         break;
 592                         }
 593                 sockopt_len = sizeof(sockopt_val);
 594                 switch (addr.sa.sa_family)
 595                         {
 596                 case AF_INET:
 597                         if ((ret = getsockopt(b->num, IPPROTO_IP, IP_MTU, (void *)&sockopt_val,
 598                                 &sockopt_len)) < 0 || sockopt_val < 0)
 599                                 {
 600                                 ret = 0;
 601                                 }
 602                         else
 603                                 {
 604                                 /* we assume that the transport protocol is UDP and no
 605                                  * IP options are used.
 606                                  */
 607                                 data->mtu = sockopt_val - 8 - 20;
 608                                 ret = data->mtu;
 609                                 }
 610                         break;
 611 #if OPENSSL_USE_IPV6 && defined(IPV6_MTU)
 612                 case AF_INET6:
 613                         if ((ret = getsockopt(b->num, IPPROTO_IPV6, IPV6_MTU, (void *)&sockopt_val,
 614                                 &sockopt_len)) < 0 || sockopt_val < 0)
 615                                 {
 616                                 ret = 0;
 617                                 }
 618                         else
 619                                 {
 620                                 /* we assume that the transport protocol is UDP and no
 621                                  * IPV6 options are used.
 622                                  */
 623                                 data->mtu = sockopt_val - 8 - 40;
 624                                 ret = data->mtu;
 625                                 }
 626                         break;
 627 #endif
 628                 default:
 629                         ret = 0;
 630                         break;
 631                         }
 632 #else
 633                 ret = 0;
 634 #endif
 635                 break;
 636         case BIO_CTRL_DGRAM_GET_FALLBACK_MTU:
 637                 switch (data->peer.sa.sa_family)
 638                         {
 639                         case AF_INET:
 640                                 ret = 576 - 20 - 8;
 641                                 break;
 642 #if OPENSSL_USE_IPV6
 643                         case AF_INET6:
 644 #ifdef IN6_IS_ADDR_V4MAPPED
 645                                 if (IN6_IS_ADDR_V4MAPPED(&data->peer.sa_in6.sin6_addr))
 646                                         ret = 576 - 20 - 8;
 647                                 else
 648 #endif
 649                                         ret = 1280 - 40 - 8;
 650                                 break;
 651 #endif
 652                         default:
 653                                 ret = 576 - 20 - 8;
 654                                 break;
 655                         }
 656                 break;
 657         case BIO_CTRL_DGRAM_GET_MTU:
 658                 return data->mtu;
 659                 break;
 660         case BIO_CTRL_DGRAM_SET_MTU:
 661                 data->mtu = num;
 662                 ret = num;
 663                 break;
 664         case BIO_CTRL_DGRAM_SET_CONNECTED:
 665                 to = (struct sockaddr *)ptr;
 666
 667                 if ( to != NULL)
 668                         {
 669                         data->connected = 1;
 670                         switch (to->sa_family)
 671                                 {
 672                                 case AF_INET:
 673                                         memcpy(&data->peer,to,sizeof(data->peer.sa_in));
 674                                         break;
 675 #if OPENSSL_USE_IPV6
 676                                 case AF_INET6:
 677                                         memcpy(&data->peer,to,sizeof(data->peer.sa_in6));
 678                                         break;
 679 #endif
 680                                 default:
 681                                         memcpy(&data->peer,to,sizeof(data->peer.sa));
 682                                         break;
 683                                 }
 684                         }
 685                 else
 686                         {
 687                         data->connected = 0;
 688                         memset(&(data->peer), 0x00, sizeof(data->peer));
 689                         }
 690                 break;
 691         case BIO_CTRL_DGRAM_GET_PEER:
 692                 switch (data->peer.sa.sa_family)
 693                         {
 694                         case AF_INET:
 695                                 ret=sizeof(data->peer.sa_in);
 696                                 break;
 697 #if OPENSSL_USE_IPV6
 698                         case AF_INET6:
 699                                 ret=sizeof(data->peer.sa_in6);
 700                                 break;
 701 #endif
 702                         default:
 703                                 ret=sizeof(data->peer.sa);
 704                                 break;
 705                         }
 706                 if (num==0 || num>ret)
 707                         num=ret;
 708                 memcpy(ptr,&data->peer,(ret=num));
 709                 break;
 710         case BIO_CTRL_DGRAM_SET_PEER:
 711                 to = (struct sockaddr *) ptr;
 712                 switch (to->sa_family)
 713                         {
 714                         case AF_INET:
 715                                 memcpy(&data->peer,to,sizeof(data->peer.sa_in));
 716                                 break;
 717 #if OPENSSL_USE_IPV6
 718                         case AF_INET6:
 719                                 memcpy(&data->peer,to,sizeof(data->peer.sa_in6));
 720                                 break;
 721 #endif
 722                         default:
 723                                 memcpy(&data->peer,to,sizeof(data->peer.sa));
 724                                 break;
 725                         }
 726                 break;
 727         case BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT:
 728                 memcpy(&(data->next_timeout), ptr, sizeof(struct timeval));
 729                 break;
 730 #if defined(SO_RCVTIMEO)
 731         case BIO_CTRL_DGRAM_SET_RECV_TIMEOUT:
 732 #ifdef OPENSSL_SYS_WINDOWS
 733                 {
 734                 struct timeval *tv = (struct timeval *)ptr;
 735                 int timeout = tv->tv_sec * 1000 + tv->tv_usec/1000;
 736                 if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 737                         (void*)&timeout, sizeof(timeout)) < 0)
 738                         { perror("setsockopt"); ret = -1; }
 739                 }
 740 #else
 741                 if ( setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, ptr,
 742                         sizeof(struct timeval)) < 0)
 743                         { perror("setsockopt"); ret = -1; }
 744 #endif
 745                 break;
 746         case BIO_CTRL_DGRAM_GET_RECV_TIMEOUT:
 747                 {
 748                 union { size_t s; int i; } sz = {0};
 749 #ifdef OPENSSL_SYS_WINDOWS
 750                 int timeout;
 751                 struct timeval *tv = (struct timeval *)ptr;
 752
 753                 sz.i = sizeof(timeout);
 754                 if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 755                         (void*)&timeout, &sz.i) < 0)
 756                         { perror("getsockopt"); ret = -1; }
 757                 else
 758                         {
 759                         tv->tv_sec = timeout / 1000;
 760                         tv->tv_usec = (timeout % 1000) * 1000;
 761                         ret = sizeof(*tv);
 762                         }
 763 #else
 764                 sz.i = sizeof(struct timeval);
 765                 if ( getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 766                         ptr, (void *)&sz) < 0)
 767                         { perror("getsockopt"); ret = -1; }
 768                 else if (sizeof(sz.s)!=sizeof(sz.i) && sz.i==0)
 769                         {
 770                         OPENSSL_assert(sz.s<=sizeof(struct timeval));
 771                         ret = (int)sz.s;
 772                         }
 773                 else
 774                         ret = sz.i;
 775 #endif
 776                 }
 777                 break;
 778 #endif
 779 #if defined(SO_SNDTIMEO)
 780         case BIO_CTRL_DGRAM_SET_SEND_TIMEOUT:
 781 #ifdef OPENSSL_SYS_WINDOWS
 782                 {
 783                 struct timeval *tv = (struct timeval *)ptr;
 784                 int timeout = tv->tv_sec * 1000 + tv->tv_usec/1000;
 785                 if (setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
 786                         (void*)&timeout, sizeof(timeout)) < 0)
 787                         { perror("setsockopt"); ret = -1; }
 788                 }
 789 #else
 790                 if ( setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO, ptr,
 791                         sizeof(struct timeval)) < 0)
 792                         { perror("setsockopt"); ret = -1; }
 793 #endif
 794                 break;
 795         case BIO_CTRL_DGRAM_GET_SEND_TIMEOUT:
 796                 {
 797                 union { size_t s; int i; } sz = {0};
 798 #ifdef OPENSSL_SYS_WINDOWS
 799                 int timeout;
 800                 struct timeval *tv = (struct timeval *)ptr;
 801
 802                 sz.i = sizeof(timeout);
 803                 if (getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
 804                         (void*)&timeout, &sz.i) < 0)
 805                         { perror("getsockopt"); ret = -1; }
 806                 else
 807                         {
 808                         tv->tv_sec = timeout / 1000;
 809                         tv->tv_usec = (timeout % 1000) * 1000;
 810                         ret = sizeof(*tv);
 811                         }
 812 #else
 813                 sz.i = sizeof(struct timeval);
 814                 if ( getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
 815                         ptr, (void *)&sz) < 0)
 816                         { perror("getsockopt"); ret = -1; }
 817                 else if (sizeof(sz.s)!=sizeof(sz.i) && sz.i==0)
 818                         {
 819                         OPENSSL_assert(sz.s<=sizeof(struct timeval));
 820                         ret = (int)sz.s;
 821                         }
 822                 else
 823                         ret = sz.i;
 824 #endif
 825                 }
 826                 break;
 827 #endif
 828         case BIO_CTRL_DGRAM_GET_SEND_TIMER_EXP:
 829                 /* fall-through */
 830         case BIO_CTRL_DGRAM_GET_RECV_TIMER_EXP:
 831 #ifdef OPENSSL_SYS_WINDOWS
 832                 if ( data->_errno == WSAETIMEDOUT)
 833 #else
 834                 if ( data->_errno == EAGAIN)
 835 #endif
 836                         {
 837                         ret = 1;
 838                         data->_errno = 0;
 839                         }
 840                 else
 841                         ret = 0;
 842                 break;
 843 #ifdef EMSGSIZE
 844         case BIO_CTRL_DGRAM_MTU_EXCEEDED:
 845                 if ( data->_errno == EMSGSIZE)
 846                         {
 847                         ret = 1;
 848                         data->_errno = 0;
 849                         }
 850                 else
 851                         ret = 0;
 852                 break;
 853 #endif
 854         case BIO_CTRL_DGRAM_SET_DONT_FRAG:
 855                 sockopt_val = num ? 1 : 0;
 856
 857                 switch (data->peer.sa.sa_family)
 858                         {
 859                         case AF_INET:
 860 #if defined(IP_DONTFRAG)
 861                                 if ((ret = setsockopt(b->num, IPPROTO_IP, IP_DONTFRAG,
 862                                         &sockopt_val, sizeof(sockopt_val))) < 0)
 863                                         { perror("setsockopt"); ret = -1; }
 864 #elif defined(OPENSSL_SYS_LINUX) && defined(IP_MTUDISCOVER)
 865                                 if ((sockopt_val = num ? IP_PMTUDISC_PROBE : IP_PMTUDISC_DONT),
 866                                     (ret = setsockopt(b->num, IPPROTO_IP, IP_MTU_DISCOVER,
 867                                         &sockopt_val, sizeof(sockopt_val))) < 0)
 868                                         { perror("setsockopt"); ret = -1; }
 869 #elif defined(OPENSSL_SYS_WINDOWS) && defined(IP_DONTFRAGMENT)
 870                                 if ((ret = setsockopt(b->num, IPPROTO_IP, IP_DONTFRAGMENT,
 871                                         (const char *)&sockopt_val, sizeof(sockopt_val))) < 0)
 872                                         { perror("setsockopt"); ret = -1; }
 873 #else
 874                                 ret = -1;
 875 #endif
 876                                 break;
 877 #if OPENSSL_USE_IPV6
 878                         case AF_INET6:
 879 #if defined(IPV6_DONTFRAG)
 880                                 if ((ret = setsockopt(b->num, IPPROTO_IPV6, IPV6_DONTFRAG,
 881                                         (const void *)&sockopt_val, sizeof(sockopt_val))) < 0)
 882                                         { perror("setsockopt"); ret = -1; }
 883 #elif defined(OPENSSL_SYS_LINUX) && defined(IPV6_MTUDISCOVER)
 884                                 if ((sockopt_val = num ? IP_PMTUDISC_PROBE : IP_PMTUDISC_DONT),
 885                                     (ret = setsockopt(b->num, IPPROTO_IPV6, IPV6_MTU_DISCOVER,
 886                                         &sockopt_val, sizeof(sockopt_val))) < 0)
 887                                         { perror("setsockopt"); ret = -1; }
 888 #else
 889                                 ret = -1;
 890 #endif
 891                                 break;
 892 #endif
 893                         default:
 894                                 ret = -1;
 895                                 break;
 896                         }
 897                 break;
 898         default:
 899                 ret=0;
 900                 break;
 901                 }
 902         return(ret);
 903         }
 904
 905 static int dgram_puts(BIO *bp, const char *str)
 906         {
 907         int n,ret;
 908
 909         n=strlen(str);
 910         ret=dgram_write(bp,str,n);
 911         return(ret);
 912         }
 913
 914 #ifndef OPENSSL_NO_SCTP
 915 BIO_METHOD *BIO_s_datagram_sctp(void)
 916         {
 917         return(&methods_dgramp_sctp);
 918         }
 919
 920 BIO *BIO_new_dgram_sctp(int fd, int close_flag)
 921         {
 922         BIO *bio;
 923         int ret, optval = 20000;
 924         int auth_data = 0, auth_forward = 0;
 925         unsigned char *p;
 926         struct sctp_authchunk auth;
 927         struct sctp_authchunks *authchunks;
 928         socklen_t sockopt_len;
 929 #ifdef SCTP_AUTHENTICATION_EVENT
 930 #ifdef SCTP_EVENT
 931         struct sctp_event event;
 932 #else
 933         struct sctp_event_subscribe event;
 934 #endif
 935 #endif
 936
 937         bio=BIO_new(BIO_s_datagram_sctp());
 938         if (bio == NULL) return(NULL);
 939         BIO_set_fd(bio,fd,close_flag);
 940
 941         /* Activate SCTP-AUTH for DATA and FORWARD-TSN chunks */
 942         auth.sauth_chunk = OPENSSL_SCTP_DATA_CHUNK_TYPE;
 943         ret = setsockopt(fd, IPPROTO_SCTP, SCTP_AUTH_CHUNK, &auth, sizeof(struct sctp_authchunk));
 944         OPENSSL_assert(ret >= 0);
 945         auth.sauth_chunk = OPENSSL_SCTP_FORWARD_CUM_TSN_CHUNK_TYPE;
 946         ret = setsockopt(fd, IPPROTO_SCTP, SCTP_AUTH_CHUNK, &auth, sizeof(struct sctp_authchunk));
 947         OPENSSL_assert(ret >= 0);
 948
 949         /* Test if activation was successful. When using accept(),
 950          * SCTP-AUTH has to be activated for the listening socket
 951          * already, otherwise the connected socket won't use it. */
 952         sockopt_len = (socklen_t)(sizeof(sctp_assoc_t) + 256 * sizeof(uint8_t));
 953         authchunks = OPENSSL_malloc(sockopt_len);
 954         memset(authchunks, 0, sizeof(sockopt_len));
 955         ret = getsockopt(fd, IPPROTO_SCTP, SCTP_LOCAL_AUTH_CHUNKS, authchunks, &sockopt_len);
 956         OPENSSL_assert(ret >= 0);
 957
 958         for (p = (unsigned char*) authchunks->gauth_chunks;
 959              p < (unsigned char*) authchunks + sockopt_len;
 960              p += sizeof(uint8_t))
 961                 {
 962                 if (*p == OPENSSL_SCTP_DATA_CHUNK_TYPE) auth_data = 1;
 963                 if (*p == OPENSSL_SCTP_FORWARD_CUM_TSN_CHUNK_TYPE) auth_forward = 1;
 964                 }
 965
 966         OPENSSL_free(authchunks);
 967
 968         OPENSSL_assert(auth_data);
 969         OPENSSL_assert(auth_forward);
 970
 971 #ifdef SCTP_AUTHENTICATION_EVENT
 972 #ifdef SCTP_EVENT
 973         memset(&event, 0, sizeof(struct sctp_event));
 974         event.se_assoc_id = 0;
 975         event.se_type = SCTP_AUTHENTICATION_EVENT;
 976         event.se_on = 1;
 977         ret = setsockopt(fd, IPPROTO_SCTP, SCTP_EVENT, &event, sizeof(struct sctp_event));
 978         OPENSSL_assert(ret >= 0);
 979 #else
 980         sockopt_len = (socklen_t) sizeof(struct sctp_event_subscribe);
 981         ret = getsockopt(fd, IPPROTO_SCTP, SCTP_EVENTS, &event, &sockopt_len);
 982         OPENSSL_assert(ret >= 0);
 983
 984         event.sctp_authentication_event = 1;
 985
 986         ret = setsockopt(fd, IPPROTO_SCTP, SCTP_EVENTS, &event, sizeof(struct sctp_event_subscribe));
 987         OPENSSL_assert(ret >= 0);
 988 #endif
 989 #endif
 990
 991         /* Disable partial delivery by setting the min size
 992          * larger than the max record size of 2^14 + 2048 + 13
 993          */
 994         ret = setsockopt(fd, IPPROTO_SCTP, SCTP_PARTIAL_DELIVERY_POINT, &optval, sizeof(optval));
 995         OPENSSL_assert(ret >= 0);
 996
 997         return(bio);
 998         }
 999
1000 int BIO_dgram_is_sctp(BIO *bio)
1001         {
1002         return (BIO_method_type(bio) == BIO_TYPE_DGRAM_SCTP);
1003         }
1004
1005 static int dgram_sctp_new(BIO *bi)
1006         {
1007         bio_dgram_sctp_data *data = NULL;
1008
1009         bi->init=0;
1010         bi->num=0;
1011         data = OPENSSL_malloc(sizeof(bio_dgram_sctp_data));
1012         if (data == NULL)
1013                 return 0;
1014         memset(data, 0x00, sizeof(bio_dgram_sctp_data));
1015 #ifdef SCTP_PR_SCTP_NONE
1016         data->prinfo.pr_policy = SCTP_PR_SCTP_NONE;
1017 #endif
1018     bi->ptr = data;
1019
1020         bi->flags=0;
1021         return(1);
1022         }
1023
1024 static int dgram_sctp_free(BIO *a)
1025         {
1026         bio_dgram_sctp_data *data;
1027
1028         if (a == NULL) return(0);
1029         if ( ! dgram_clear(a))
1030                 return 0;
1031
1032         data = (bio_dgram_sctp_data *)a->ptr;
1033         if(data != NULL) OPENSSL_free(data);
1034
1035         return(1);
1036         }
1037
1038 #ifdef SCTP_AUTHENTICATION_EVENT
1039 void dgram_sctp_handle_auth_free_key_event(BIO *b, union sctp_notification *snp)
1040         {
1041         int ret;
1042         struct sctp_authkey_event* authkeyevent = &snp->sn_auth_event;
1043
1044         if (authkeyevent->auth_indication == SCTP_AUTH_FREE_KEY)
1045                 {
1046                 struct sctp_authkeyid authkeyid;
1047
1048                 /* delete key */
1049                 authkeyid.scact_keynumber = authkeyevent->auth_keynumber;
1050                 ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_DELETE_KEY,
1051                       &authkeyid, sizeof(struct sctp_authkeyid));
1052                 }
1053         }
1054 #endif
1055
1056 static int dgram_sctp_read(BIO *b, char *out, int outl)
1057         {
1058         int ret = 0, n = 0, i, optval;
1059         socklen_t optlen;
1060         bio_dgram_sctp_data *data = (bio_dgram_sctp_data *)b->ptr;
1061         union sctp_notification *snp;
1062         struct msghdr msg;
1063         struct iovec iov;
1064         struct cmsghdr *cmsg;
1065         char cmsgbuf[512];
1066
1067         if (out != NULL)
1068                 {
1069                 clear_socket_error();
1070
1071                 do
1072                         {
1073                         memset(&data->rcvinfo, 0x00, sizeof(struct bio_dgram_sctp_rcvinfo));
1074                         iov.iov_base = out;
1075                         iov.iov_len = outl;
1076                         msg.msg_name = NULL;
1077                         msg.msg_namelen = 0;
1078                         msg.msg_iov = &iov;
1079                         msg.msg_iovlen = 1;
1080                         msg.msg_control = cmsgbuf;
1081                         msg.msg_controllen = 512;
1082                         msg.msg_flags = 0;
1083                         n = recvmsg(b->num, &msg, 0);
1084
1085                         if (msg.msg_controllen > 0)
1086                                 {
1087                                 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg))
1088                                         {
1089                                         if (cmsg->cmsg_level != IPPROTO_SCTP)
1090                                                 continue;
1091 #ifdef SCTP_RCVINFO
1092                                         if (cmsg->cmsg_type == SCTP_RCVINFO)
1093                                                 {
1094                                                 struct sctp_rcvinfo *rcvinfo;
1095
1096                                                 rcvinfo = (struct sctp_rcvinfo *)CMSG_DATA(cmsg);
1097                                                 data->rcvinfo.rcv_sid = rcvinfo->rcv_sid;
1098                                                 data->rcvinfo.rcv_ssn = rcvinfo->rcv_ssn;
1099                                                 data->rcvinfo.rcv_flags = rcvinfo->rcv_flags;
1100                                                 data->rcvinfo.rcv_ppid = rcvinfo->rcv_ppid;
1101                                                 data->rcvinfo.rcv_tsn = rcvinfo->rcv_tsn;
1102                                                 data->rcvinfo.rcv_cumtsn = rcvinfo->rcv_cumtsn;
1103                                                 data->rcvinfo.rcv_context = rcvinfo->rcv_context;
1104                                                 }
1105 #endif
1106 #ifdef SCTP_SNDRCV
1107                                         if (cmsg->cmsg_type == SCTP_SNDRCV)
1108                                                 {
1109                                                 struct sctp_sndrcvinfo *sndrcvinfo;
1110
1111                                                 sndrcvinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
1112                                                 data->rcvinfo.rcv_sid = sndrcvinfo->sinfo_stream;
1113                                                 data->rcvinfo.rcv_ssn = sndrcvinfo->sinfo_ssn;
1114                                                 data->rcvinfo.rcv_flags = sndrcvinfo->sinfo_flags;
1115                                                 data->rcvinfo.rcv_ppid = sndrcvinfo->sinfo_ppid;
1116                                                 data->rcvinfo.rcv_tsn = sndrcvinfo->sinfo_tsn;
1117                                                 data->rcvinfo.rcv_cumtsn = sndrcvinfo->sinfo_cumtsn;
1118                                                 data->rcvinfo.rcv_context = sndrcvinfo->sinfo_context;
1119                                                 }
1120 #endif
1121                                         }
1122                                 }
1123
1124                         if (n <= 0)
1125                                 {
1126                                 if (n < 0)
1127                                         ret = n;
1128                                 break;
1129                                 }
1130
1131                         if (msg.msg_flags & MSG_NOTIFICATION)
1132                                 {
1133                                 snp = (union sctp_notification*) out;
1134                                 if (snp->sn_header.sn_type == SCTP_SENDER_DRY_EVENT)
1135                                         {
1136 #ifdef SCTP_EVENT
1137                                         struct sctp_event event;
1138 #else
1139                                         struct sctp_event_subscribe event;
1140                                         socklen_t eventsize;
1141 #endif
1142                                         /* If a message has been delayed until the socket
1143                                          * is dry, it can be sent now.
1144                                          */
1145                                         if (data->saved_message.length > 0)
1146                                                 {
1147                                                 dgram_sctp_write(data->saved_message.bio, data->saved_message.data,
1148                                                                  data->saved_message.length);
1149                                                 OPENSSL_free(data->saved_message.data);
1150                                                 data->saved_message.length = 0;
1151                                                 }
1152
1153                                         /* disable sender dry event */
1154 #ifdef SCTP_EVENT
1155                                         memset(&event, 0, sizeof(struct sctp_event));
1156                                         event.se_assoc_id = 0;
1157                                         event.se_type = SCTP_SENDER_DRY_EVENT;
1158                                         event.se_on = 0;
1159                                         i = setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENT, &event, sizeof(struct sctp_event));
1160                                         OPENSSL_assert(i >= 0);
1161 #else
1162                                         eventsize = sizeof(struct sctp_event_subscribe);
1163                                         i = getsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event, &eventsize);
1164                                         OPENSSL_assert(i >= 0);
1165
1166                                         event.sctp_sender_dry_event = 0;
1167
1168                                         i = setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event, sizeof(struct sctp_event_subscribe));
1169                                         OPENSSL_assert(i >= 0);
1170 #endif
1171                                         }
1172
1173 #ifdef SCTP_AUTHENTICATION_EVENT
1174                                 if (snp->sn_header.sn_type == SCTP_AUTHENTICATION_EVENT)
1175                                         dgram_sctp_handle_auth_free_key_event(b, snp);
1176 #endif
1177
1178                                 if (data->handle_notifications != NULL)
1179                                         data->handle_notifications(b, data->notification_context, (void*) out);
1180
1181                                 memset(out, 0, outl);
1182                                 }
1183                         else
1184                                 ret += n;
1185                         }
1186                 while ((msg.msg_flags & MSG_NOTIFICATION) && (msg.msg_flags & MSG_EOR) && (ret < outl));
1187
1188                 if (ret > 0 && !(msg.msg_flags & MSG_EOR))
1189                         {
1190                         /* Partial message read, this should never happen! */
1191
1192                         /* The buffer was too small, this means the peer sent
1193                          * a message that was larger than allowed. */
1194                         if (ret == outl)
1195                                 return -1;
1196
1197                         /* Test if socket buffer can handle max record
1198                          * size (2^14 + 2048 + 13)
1199                          */
1200                         optlen = (socklen_t) sizeof(int);
1201                         ret = getsockopt(b->num, SOL_SOCKET, SO_RCVBUF, &optval, &optlen);
1202                         OPENSSL_assert(ret >= 0);
1203                         OPENSSL_assert(optval >= 18445);
1204
1205                         /* Test if SCTP doesn't partially deliver below
1206                          * max record size (2^14 + 2048 + 13)
1207                          */
1208                         optlen = (socklen_t) sizeof(int);
1209                         ret = getsockopt(b->num, IPPROTO_SCTP, SCTP_PARTIAL_DELIVERY_POINT,
1210                                          &optval, &optlen);
1211                         OPENSSL_assert(ret >= 0);
1212                         OPENSSL_assert(optval >= 18445);
1213
1214                         /* Partially delivered notification??? Probably a bug.... */
1215                         OPENSSL_assert(!(msg.msg_flags & MSG_NOTIFICATION));
1216
1217                         /* Everything seems ok till now, so it's most likely
1218                          * a message dropped by PR-SCTP.
1219                          */
1220                         memset(out, 0, outl);
1221                         BIO_set_retry_read(b);
1222                         return -1;
1223                         }
1224
1225                 BIO_clear_retry_flags(b);
1226                 if (ret < 0)
1227                         {
1228                         if (BIO_dgram_should_retry(ret))
1229                                 {
1230                                 BIO_set_retry_read(b);
1231                                 data->_errno = get_last_socket_error();
1232                                 }
1233                         }
1234
1235                 /* Test if peer uses SCTP-AUTH before continuing */
1236                 if (!data->peer_auth_tested)
1237                         {
1238                         int ii, auth_data = 0, auth_forward = 0;
1239                         unsigned char *p;
1240                         struct sctp_authchunks *authchunks;
1241
1242                         optlen = (socklen_t)(sizeof(sctp_assoc_t) + 256 * sizeof(uint8_t));
1243                         authchunks = OPENSSL_malloc(optlen);
1244                         memset(authchunks, 0, sizeof(optlen));
1245                         ii = getsockopt(b->num, IPPROTO_SCTP, SCTP_PEER_AUTH_CHUNKS, authchunks, &optlen);
1246                         OPENSSL_assert(ii >= 0);
1247
1248                         for (p = (unsigned char*) authchunks->gauth_chunks;
1249                                  p < (unsigned char*) authchunks + optlen;
1250                                  p += sizeof(uint8_t))
1251                                 {
1252                                 if (*p == OPENSSL_SCTP_DATA_CHUNK_TYPE) auth_data = 1;
1253                                 if (*p == OPENSSL_SCTP_FORWARD_CUM_TSN_CHUNK_TYPE) auth_forward = 1;
1254                                 }
1255
1256                         OPENSSL_free(authchunks);
1257
1258                         if (!auth_data || !auth_forward)
1259                                 {
1260                                 BIOerr(BIO_F_DGRAM_SCTP_READ,BIO_R_CONNECT_ERROR);
1261                                 return -1;
1262                                 }
1263
1264                         data->peer_auth_tested = 1;
1265                         }
1266                 }
1267         return(ret);
1268         }
1269
1270 static int dgram_sctp_write(BIO *b, const char *in, int inl)
1271         {
1272         int ret;
1273         bio_dgram_sctp_data *data = (bio_dgram_sctp_data *)b->ptr;
1274         struct bio_dgram_sctp_sndinfo *sinfo = &(data->sndinfo);
1275         struct bio_dgram_sctp_prinfo *pinfo = &(data->prinfo);
1276         struct bio_dgram_sctp_sndinfo handshake_sinfo;
1277         struct iovec iov[1];
1278         struct msghdr msg;
1279         struct cmsghdr *cmsg;
1280 #if defined(SCTP_SNDINFO) && defined(SCTP_PRINFO)
1281         char cmsgbuf[CMSG_SPACE(sizeof(struct sctp_sndinfo)) + CMSG_SPACE(sizeof(struct sctp_prinfo))];
1282         struct sctp_sndinfo *sndinfo;
1283         struct sctp_prinfo *prinfo;
1284 #else
1285         char cmsgbuf[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))];
1286         struct sctp_sndrcvinfo *sndrcvinfo;
1287 #endif
1288
1289         clear_socket_error();
1290
1291         /* If we're send anything else than application data,
1292          * disable all user parameters and flags.
1293          */
1294         if (in[0] != 23) {
1295                 memset(&handshake_sinfo, 0x00, sizeof(struct bio_dgram_sctp_sndinfo));
1296 #ifdef SCTP_SACK_IMMEDIATELY
1297                 handshake_sinfo.snd_flags = SCTP_SACK_IMMEDIATELY;
1298 #endif
1299                 sinfo = &handshake_sinfo;
1300         }
1301
1302         /* If we have to send a shutdown alert message and the
1303          * socket is not dry yet, we have to save it and send it
1304          * as soon as the socket gets dry.
1305          */
1306         if (data->save_shutdown && !BIO_dgram_sctp_wait_for_dry(b))
1307         {
1308                 data->saved_message.bio = b;
1309                 data->saved_message.length = inl;
1310                 data->saved_message.data = OPENSSL_malloc(inl);
1311                 memcpy(data->saved_message.data, in, inl);
1312                 return inl;
1313         }
1314
1315         iov[0].iov_base = (char *)in;
1316         iov[0].iov_len = inl;
1317         msg.msg_name = NULL;
1318         msg.msg_namelen = 0;
1319         msg.msg_iov = iov;
1320         msg.msg_iovlen = 1;
1321         msg.msg_control = (caddr_t)cmsgbuf;
1322         msg.msg_controllen = 0;
1323         msg.msg_flags = 0;
1324 #if defined(SCTP_SNDINFO) && defined(SCTP_PRINFO)
1325         cmsg = (struct cmsghdr *)cmsgbuf;
1326         cmsg->cmsg_level = IPPROTO_SCTP;
1327         cmsg->cmsg_type = SCTP_SNDINFO;
1328         cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndinfo));
1329         sndinfo = (struct sctp_sndinfo *)CMSG_DATA(cmsg);
1330         memset(sndinfo, 0, sizeof(struct sctp_sndinfo));
1331         sndinfo->snd_sid = sinfo->snd_sid;
1332         sndinfo->snd_flags = sinfo->snd_flags;
1333         sndinfo->snd_ppid = sinfo->snd_ppid;
1334         sndinfo->snd_context = sinfo->snd_context;
1335         msg.msg_controllen += CMSG_SPACE(sizeof(struct sctp_sndinfo));
1336
1337         cmsg = (struct cmsghdr *)&cmsgbuf[CMSG_SPACE(sizeof(struct sctp_sndinfo))];
1338         cmsg->cmsg_level = IPPROTO_SCTP;
1339         cmsg->cmsg_type = SCTP_PRINFO;
1340         cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_prinfo));
1341         prinfo = (struct sctp_prinfo *)CMSG_DATA(cmsg);
1342         memset(prinfo, 0, sizeof(struct sctp_prinfo));
1343         prinfo->pr_policy = pinfo->pr_policy;
1344         prinfo->pr_value = pinfo->pr_value;
1345         msg.msg_controllen += CMSG_SPACE(sizeof(struct sctp_prinfo));
1346 #else
1347         cmsg = (struct cmsghdr *)cmsgbuf;
1348         cmsg->cmsg_level = IPPROTO_SCTP;
1349         cmsg->cmsg_type = SCTP_SNDRCV;
1350         cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo));
1351         sndrcvinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
1352         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
1353         sndrcvinfo->sinfo_stream = sinfo->snd_sid;
1354         sndrcvinfo->sinfo_flags = sinfo->snd_flags;
1355 #ifdef __FreeBSD__
1356         sndrcvinfo->sinfo_flags |= pinfo->pr_policy;
1357 #endif
1358         sndrcvinfo->sinfo_ppid = sinfo->snd_ppid;
1359         sndrcvinfo->sinfo_context = sinfo->snd_context;
1360         sndrcvinfo->sinfo_timetolive = pinfo->pr_value;
1361         msg.msg_controllen += CMSG_SPACE(sizeof(struct sctp_sndrcvinfo));
1362 #endif
1363
1364         ret = sendmsg(b->num, &msg, 0);
1365
1366         BIO_clear_retry_flags(b);
1367         if (ret <= 0)
1368                 {
1369                 if (BIO_dgram_should_retry(ret))
1370                         {
1371                         BIO_set_retry_write(b);
1372                         data->_errno = get_last_socket_error();
1373                         }
1374                 }
1375         return(ret);
1376         }
1377
1378 static long dgram_sctp_ctrl(BIO *b, int cmd, long num, void *ptr)
1379         {
1380         long ret=1;
1381         bio_dgram_sctp_data *data = NULL;
1382         socklen_t sockopt_len = 0;
1383         struct sctp_authkeyid authkeyid;
1384         struct sctp_authkey *authkey;
1385
1386         data = (bio_dgram_sctp_data *)b->ptr;
1387
1388         switch (cmd)
1389                 {
1390         case BIO_CTRL_DGRAM_QUERY_MTU:
1391                 /* Set to maximum (2^14)
1392                  * and ignore user input to enable transport
1393                  * protocol fragmentation.
1394                  * Returns always 2^14.
1395                  */
1396                 data->mtu = 16384;
1397                 ret = data->mtu;
1398                 break;
1399         case BIO_CTRL_DGRAM_SET_MTU:
1400                 /* Set to maximum (2^14)
1401                  * and ignore input to enable transport
1402                  * protocol fragmentation.
1403                  * Returns always 2^14.
1404                  */
1405                 data->mtu = 16384;
1406                 ret = data->mtu;
1407                 break;
1408         case BIO_CTRL_DGRAM_SET_CONNECTED:
1409         case BIO_CTRL_DGRAM_CONNECT:
1410                 /* Returns always -1. */
1411                 ret = -1;
1412                 break;
1413         case BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT:
1414                 /* SCTP doesn't need the DTLS timer
1415                  * Returns always 1.
1416                  */
1417                 break;
1418         case BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE:
1419                 if (num > 0)
1420                         data->in_handshake = 1;
1421                 else
1422                         data->in_handshake = 0;
1423
1424                 ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_NODELAY, &data->in_handshake, sizeof(int));
1425                 break;
1426         case BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY:
1427                 /* New shared key for SCTP AUTH.
1428                  * Returns 0 on success, -1 otherwise.
1429                  */
1430
1431                 /* Get active key */
1432                 sockopt_len = sizeof(struct sctp_authkeyid);
1433                 ret = getsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY, &authkeyid, &sockopt_len);
1434                 if (ret < 0) break;
1435
1436                 /* Add new key */
1437                 sockopt_len = sizeof(struct sctp_authkey) + 64 * sizeof(uint8_t);
1438                 authkey = OPENSSL_malloc(sockopt_len);
1439                 memset(authkey, 0x00, sockopt_len);
1440                 authkey->sca_keynumber = authkeyid.scact_keynumber + 1;
1441 #ifndef __FreeBSD__
1442                 /* This field is missing in FreeBSD 8.2 and earlier,
1443                  * and FreeBSD 8.3 and higher work without it.
1444                  */
1445                 authkey->sca_keylength = 64;
1446 #endif
1447                 memcpy(&authkey->sca_key[0], ptr, 64 * sizeof(uint8_t));
1448
1449                 ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_KEY, authkey, sockopt_len);
1450                 if (ret < 0) break;
1451
1452                 /* Reset active key */
1453                 ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY,
1454                       &authkeyid, sizeof(struct sctp_authkeyid));
1455                 if (ret < 0) break;
1456
1457                 break;
1458         case BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY:
1459                 /* Returns 0 on success, -1 otherwise. */
1460
1461                 /* Get active key */
1462                 sockopt_len = sizeof(struct sctp_authkeyid);
1463                 ret = getsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY, &authkeyid, &sockopt_len);
1464                 if (ret < 0) break;
1465
1466                 /* Set active key */
1467                 authkeyid.scact_keynumber = authkeyid.scact_keynumber + 1;
1468                 ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY,
1469                       &authkeyid, sizeof(struct sctp_authkeyid));
1470                 if (ret < 0) break;
1471
1472                 /* CCS has been sent, so remember that and fall through
1473                  * to check if we need to deactivate an old key
1474                  */
1475                 data->ccs_sent = 1;
1476
1477         case BIO_CTRL_DGRAM_SCTP_AUTH_CCS_RCVD:
1478                 /* Returns 0 on success, -1 otherwise. */
1479
1480                 /* Has this command really been called or is this just a fall-through? */
1481                 if (cmd == BIO_CTRL_DGRAM_SCTP_AUTH_CCS_RCVD)
1482                         data->ccs_rcvd = 1;
1483
1484                 /* CSS has been both, received and sent, so deactivate an old key */
1485                 if (data->ccs_rcvd == 1 && data->ccs_sent == 1)
1486                         {
1487                         /* Get active key */
1488                         sockopt_len = sizeof(struct sctp_authkeyid);
1489                         ret = getsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY, &authkeyid, &sockopt_len);
1490                         if (ret < 0) break;
1491
1492                         /* Deactivate key or delete second last key if
1493                          * SCTP_AUTHENTICATION_EVENT is not available.
1494                          */
1495                         authkeyid.scact_keynumber = authkeyid.scact_keynumber - 1;
1496 #ifdef SCTP_AUTH_DEACTIVATE_KEY
1497                         sockopt_len = sizeof(struct sctp_authkeyid);
1498                         ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_DEACTIVATE_KEY,
1499                               &authkeyid, sockopt_len);
1500                         if (ret < 0) break;
1501 #endif
1502 #ifndef SCTP_AUTHENTICATION_EVENT
1503                         if (authkeyid.scact_keynumber > 0)
1504                                 {
1505                                 authkeyid.scact_keynumber = authkeyid.scact_keynumber - 1;
1506                                 ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_DELETE_KEY,
1507                                           &authkeyid, sizeof(struct sctp_authkeyid));
1508                                 if (ret < 0) break;
1509                                 }
1510 #endif
1511
1512                         data->ccs_rcvd = 0;
1513                         data->ccs_sent = 0;
1514                         }
1515                 break;
1516         case BIO_CTRL_DGRAM_SCTP_GET_SNDINFO:
1517                 /* Returns the size of the copied struct. */
1518                 if (num > (long) sizeof(struct bio_dgram_sctp_sndinfo))
1519                         num = sizeof(struct bio_dgram_sctp_sndinfo);
1520
1521                 memcpy(ptr, &(data->sndinfo), num);
1522                 ret = num;
1523                 break;
1524         case BIO_CTRL_DGRAM_SCTP_SET_SNDINFO:
1525                 /* Returns the size of the copied struct. */
1526                 if (num > (long) sizeof(struct bio_dgram_sctp_sndinfo))
1527                         num = sizeof(struct bio_dgram_sctp_sndinfo);
1528
1529                 memcpy(&(data->sndinfo), ptr, num);
1530                 break;
1531         case BIO_CTRL_DGRAM_SCTP_GET_RCVINFO:
1532                 /* Returns the size of the copied struct. */
1533                 if (num > (long) sizeof(struct bio_dgram_sctp_rcvinfo))
1534                         num = sizeof(struct bio_dgram_sctp_rcvinfo);
1535
1536                 memcpy(ptr, &data->rcvinfo, num);
1537
1538                 ret = num;
1539                 break;
1540         case BIO_CTRL_DGRAM_SCTP_SET_RCVINFO:
1541                 /* Returns the size of the copied struct. */
1542                 if (num > (long) sizeof(struct bio_dgram_sctp_rcvinfo))
1543                         num = sizeof(struct bio_dgram_sctp_rcvinfo);
1544
1545                 memcpy(&(data->rcvinfo), ptr, num);
1546                 break;
1547         case BIO_CTRL_DGRAM_SCTP_GET_PRINFO:
1548                 /* Returns the size of the copied struct. */
1549                 if (num > (long) sizeof(struct bio_dgram_sctp_prinfo))
1550                         num = sizeof(struct bio_dgram_sctp_prinfo);
1551
1552                 memcpy(ptr, &(data->prinfo), num);
1553                 ret = num;
1554                 break;
1555         case BIO_CTRL_DGRAM_SCTP_SET_PRINFO:
1556                 /* Returns the size of the copied struct. */
1557                 if (num > (long) sizeof(struct bio_dgram_sctp_prinfo))
1558                         num = sizeof(struct bio_dgram_sctp_prinfo);
1559
1560                 memcpy(&(data->prinfo), ptr, num);
1561                 break;
1562         case BIO_CTRL_DGRAM_SCTP_SAVE_SHUTDOWN:
1563                 /* Returns always 1. */
1564                 if (num > 0)
1565                         data->save_shutdown = 1;
1566                 else
1567                         data->save_shutdown = 0;
1568                 break;
1569
1570         default:
1571                 /* Pass to default ctrl function to
1572                  * process SCTP unspecific commands
1573                  */
1574                 ret=dgram_ctrl(b, cmd, num, ptr);
1575                 break;
1576                 }
1577         return(ret);
1578         }
1579
1580 int BIO_dgram_sctp_notification_cb(BIO *b,
1581                                    void (*handle_notifications)(BIO *bio, void *context, void *buf),
1582                                    void *context)
1583         {
1584         bio_dgram_sctp_data *data = (bio_dgram_sctp_data *) b->ptr;
1585
1586         if (handle_notifications != NULL)
1587                 {
1588                 data->handle_notifications = handle_notifications;
1589                 data->notification_context = context;
1590                 }
1591         else
1592                 return -1;
1593
1594         return 0;
1595         }
1596
1597 int BIO_dgram_sctp_wait_for_dry(BIO *b)
1598 {
1599         int is_dry = 0;
1600         int n, sockflags, ret;
1601         union sctp_notification snp;
1602         struct msghdr msg;
1603         struct iovec iov;
1604 #ifdef SCTP_EVENT
1605         struct sctp_event event;
1606 #else
1607         struct sctp_event_subscribe event;
1608         socklen_t eventsize;
1609 #endif
1610         bio_dgram_sctp_data *data = (bio_dgram_sctp_data *)b->ptr;
1611
1612         /* set sender dry event */
1613 #ifdef SCTP_EVENT
1614         memset(&event, 0, sizeof(struct sctp_event));
1615         event.se_assoc_id = 0;
1616         event.se_type = SCTP_SENDER_DRY_EVENT;
1617         event.se_on = 1;
1618         ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENT, &event, sizeof(struct sctp_event));
1619 #else
1620         eventsize = sizeof(struct sctp_event_subscribe);
1621         ret = getsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event, &eventsize);
1622         if (ret < 0)
1623                 return -1;
1624
1625         event.sctp_sender_dry_event = 1;
1626
1627         ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event, sizeof(struct sctp_event_subscribe));
1628 #endif
1629         if (ret < 0)
1630                 return -1;
1631
1632         /* peek for notification */
1633         memset(&snp, 0x00, sizeof(union sctp_notification));
1634         iov.iov_base = (char *)&snp;
1635         iov.iov_len = sizeof(union sctp_notification);
1636         msg.msg_name = NULL;
1637         msg.msg_namelen = 0;
1638         msg.msg_iov = &iov;
1639         msg.msg_iovlen = 1;
1640         msg.msg_control = NULL;
1641         msg.msg_controllen = 0;
1642         msg.msg_flags = 0;
1643
1644         n = recvmsg(b->num, &msg, MSG_PEEK);
1645         if (n <= 0)
1646                 {
1647                 if ((n < 0) && (get_last_socket_error() != EAGAIN) && (get_last_socket_error() != EWOULDBLOCK))
1648                         return -1;
1649                 else
1650                         return 0;
1651                 }
1652
1653         /* if we find a notification, process it and try again if necessary */
1654         while (msg.msg_flags & MSG_NOTIFICATION)
1655                 {
1656                 memset(&snp, 0x00, sizeof(union sctp_notification));
1657                 iov.iov_base = (char *)&snp;
1658                 iov.iov_len = sizeof(union sctp_notification);
1659                 msg.msg_name = NULL;
1660                 msg.msg_namelen = 0;
1661                 msg.msg_iov = &iov;
1662                 msg.msg_iovlen = 1;
1663                 msg.msg_control = NULL;
1664                 msg.msg_controllen = 0;
1665                 msg.msg_flags = 0;
1666
1667                 n = recvmsg(b->num, &msg, 0);
1668                 if (n <= 0)
1669                         {
1670                         if ((n < 0) && (get_last_socket_error() != EAGAIN) && (get_last_socket_error() != EWOULDBLOCK))
1671                                 return -1;
1672                         else
1673                                 return is_dry;
1674                         }
1675
1676                 if (snp.sn_header.sn_type == SCTP_SENDER_DRY_EVENT)
1677                         {
1678                         is_dry = 1;
1679
1680                         /* disable sender dry event */
1681 #ifdef SCTP_EVENT
1682                         memset(&event, 0, sizeof(struct sctp_event));
1683                         event.se_assoc_id = 0;
1684                         event.se_type = SCTP_SENDER_DRY_EVENT;
1685                         event.se_on = 0;
1686                         ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENT, &event, sizeof(struct sctp_event));
1687 #else
1688                         eventsize = (socklen_t) sizeof(struct sctp_event_subscribe);
1689                         ret = getsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event, &eventsize);
1690                         if (ret < 0)
1691                                 return -1;
1692
1693                         event.sctp_sender_dry_event = 0;
1694
1695                         ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event, sizeof(struct sctp_event_subscribe));
1696 #endif
1697                         if (ret < 0)
1698                                 return -1;
1699                         }
1700
1701 #ifdef SCTP_AUTHENTICATION_EVENT
1702                 if (snp.sn_header.sn_type == SCTP_AUTHENTICATION_EVENT)
1703                         dgram_sctp_handle_auth_free_key_event(b, &snp);
1704 #endif
1705
1706                 if (data->handle_notifications != NULL)
1707                         data->handle_notifications(b, data->notification_context, (void*) &snp);
1708
1709                 /* found notification, peek again */
1710                 memset(&snp, 0x00, sizeof(union sctp_notification));
1711                 iov.iov_base = (char *)&snp;
1712                 iov.iov_len = sizeof(union sctp_notification);
1713                 msg.msg_name = NULL;
1714                 msg.msg_namelen = 0;
1715                 msg.msg_iov = &iov;
1716                 msg.msg_iovlen = 1;
1717                 msg.msg_control = NULL;
1718                 msg.msg_controllen = 0;
1719                 msg.msg_flags = 0;
1720
1721                 /* if we have seen the dry already, don't wait */
1722                 if (is_dry)
1723                         {
1724                         sockflags = fcntl(b->num, F_GETFL, 0);
1725                         fcntl(b->num, F_SETFL, O_NONBLOCK);
1726                         }
1727
1728                 n = recvmsg(b->num, &msg, MSG_PEEK);
1729
1730                 if (is_dry)
1731                         {
1732                         fcntl(b->num, F_SETFL, sockflags);
1733                         }
1734
1735                 if (n <= 0)
1736                         {
1737                         if ((n < 0) && (get_last_socket_error() != EAGAIN) && (get_last_socket_error() != EWOULDBLOCK))
1738                                 return -1;
1739                         else
1740                                 return is_dry;
1741                         }
1742                 }
1743
1744         /* read anything else */
1745         return is_dry;
1746 }
1747
1748 int BIO_dgram_sctp_msg_waiting(BIO *b)
1749         {
1750         int n, sockflags;
1751         union sctp_notification snp;
1752         struct msghdr msg;
1753         struct iovec iov;
1754         bio_dgram_sctp_data *data = (bio_dgram_sctp_data *)b->ptr;
1755
1756         /* Check if there are any messages waiting to be read */
1757         do
1758                 {
1759                 memset(&snp, 0x00, sizeof(union sctp_notification));
1760                 iov.iov_base = (char *)&snp;
1761                 iov.iov_len = sizeof(union sctp_notification);
1762                 msg.msg_name = NULL;
1763                 msg.msg_namelen = 0;
1764                 msg.msg_iov = &iov;
1765                 msg.msg_iovlen = 1;
1766                 msg.msg_control = NULL;
1767                 msg.msg_controllen = 0;
1768                 msg.msg_flags = 0;
1769
1770                 sockflags = fcntl(b->num, F_GETFL, 0);
1771                 fcntl(b->num, F_SETFL, O_NONBLOCK);
1772                 n = recvmsg(b->num, &msg, MSG_PEEK);
1773                 fcntl(b->num, F_SETFL, sockflags);
1774
1775                 /* if notification, process and try again */
1776                 if (n > 0 && (msg.msg_flags & MSG_NOTIFICATION))
1777                         {
1778 #ifdef SCTP_AUTHENTICATION_EVENT
1779                         if (snp.sn_header.sn_type == SCTP_AUTHENTICATION_EVENT)
1780                                 dgram_sctp_handle_auth_free_key_event(b, &snp);
1781 #endif
1782
1783                         memset(&snp, 0x00, sizeof(union sctp_notification));
1784                         iov.iov_base = (char *)&snp;
1785                         iov.iov_len = sizeof(union sctp_notification);
1786                         msg.msg_name = NULL;
1787                         msg.msg_namelen = 0;
1788                         msg.msg_iov = &iov;
1789                         msg.msg_iovlen = 1;
1790                         msg.msg_control = NULL;
1791                         msg.msg_controllen = 0;
1792                         msg.msg_flags = 0;
1793                         n = recvmsg(b->num, &msg, 0);
1794
1795                         if (data->handle_notifications != NULL)
1796                                 data->handle_notifications(b, data->notification_context, (void*) &snp);
1797                         }
1798
1799                 } while (n > 0 && (msg.msg_flags & MSG_NOTIFICATION));
1800
1801         /* Return 1 if there is a message to be read, return 0 otherwise. */
1802         if (n > 0)
1803                 return 1;
1804         else
1805                 return 0;
1806         }
1807
1808 static int dgram_sctp_puts(BIO *bp, const char *str)
1809         {
1810         int n,ret;
1811
1812         n=strlen(str);
1813         ret=dgram_sctp_write(bp,str,n);
1814         return(ret);
1815         }
1816 #endif
1817
1818 static int BIO_dgram_should_retry(int i)
1819         {
1820         int err;
1821
1822         if ((i == 0) || (i == -1))
1823                 {
1824                 err=get_last_socket_error();
1825
1826 #if defined(OPENSSL_SYS_WINDOWS)
1827         /* If the socket return value (i) is -1
1828          * and err is unexpectedly 0 at this point,
1829          * the error code was overwritten by
1830          * another system call before this error
1831          * handling is called.
1832          */
1833 #endif
1834
1835                 return(BIO_dgram_non_fatal_error(err));
1836                 }
1837         return(0);
1838         }
1839
1840 int BIO_dgram_non_fatal_error(int err)
1841         {
1842         switch (err)
1843                 {
1844 #if defined(OPENSSL_SYS_WINDOWS)
1845 # if defined(WSAEWOULDBLOCK)
1846         case WSAEWOULDBLOCK:
1847 # endif
1848
1849 # if 0 /* This appears to always be an error */
1850 #  if defined(WSAENOTCONN)
1851         case WSAENOTCONN:
1852 #  endif
1853 # endif
1854 #endif
1855
1856 #ifdef EWOULDBLOCK
1857 # ifdef WSAEWOULDBLOCK
1858 #  if WSAEWOULDBLOCK != EWOULDBLOCK
1859         case EWOULDBLOCK:
1860 #  endif
1861 # else
1862         case EWOULDBLOCK:
1863 # endif
1864 #endif
1865
1866 #ifdef EINTR
1867         case EINTR:
1868 #endif
1869
1870 #ifdef EAGAIN
1871 #if EWOULDBLOCK != EAGAIN
1872         case EAGAIN:
1873 # endif
1874 #endif
1875
1876 #ifdef EPROTO
1877         case EPROTO:
1878 #endif
1879
1880 #ifdef EINPROGRESS
1881         case EINPROGRESS:
1882 #endif
1883
1884 #ifdef EALREADY
1885         case EALREADY:
1886 #endif
1887
1888                 return(1);
1889                 /* break; */
1890         default:
1891                 break;
1892                 }
1893         return(0);
1894         }
1895
1896 static void get_current_time(struct timeval *t)
1897         {
1898 #if defined(_WIN32)
1899         SYSTEMTIME st;
1900         union { unsigned __int64 ul; FILETIME ft; } now;
1901
1902         GetSystemTime(&st);
1903         SystemTimeToFileTime(&st,&now.ft);
1904         now.ul -= 116444736000000000UI64;       /* re-bias to 1/1/1970 */
1905         t->tv_sec  = (long)(now.ul/10000000);
1906         t->tv_usec = ((int)(now.ul%10000000))/10;
1907 #elif defined(OPENSSL_SYS_VMS)
1908         struct timeb tb;
1909         ftime(&tb);
1910         t->tv_sec = (long)tb.time;
1911         t->tv_usec = (long)tb.millitm * 1000;
1912 #else
1913         gettimeofday(t, NULL);
1914 #endif
1915         }
1916
1917 #endif