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 #if defined(OPENSSL_SYS_LINUX) && !defined(IP_MTU)
  81 #define IP_MTU      14 /* linux is lame */
  82 #endif
  83
  84 #if defined(__FreeBSD__) && defined(IN6_IS_ADDR_V4MAPPED)
  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         union { size_t s; int i; } sz = {0};
 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
 279                 sz.i = sizeof(timeout);
 280                 if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 281                                            (void*)&timeout, &sz.i) < 0)
 282                         { perror("getsockopt"); }
 283                 else
 284                         {
 285                         data->socket_timeout.tv_sec = timeout / 1000;
 286                         data->socket_timeout.tv_usec = (timeout % 1000) * 1000;
 287                         }
 288 #else
 289                 sz.i = sizeof(data->socket_timeout);
 290                 if ( getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 291                                                 &(data->socket_timeout), (void *)&sz) < 0)
 292                         { perror("getsockopt"); }
 293                 else if (sizeof(sz.s)!=sizeof(sz.i) && sz.i==0)
 294                         OPENSSL_assert(sz.s<=sizeof(data->socket_timeout));
 295 #endif
 296
 297                 /* Get current time */
 298                 get_current_time(&timenow);
 299
 300                 /* Calculate time left until timer expires */
 301                 memcpy(&timeleft, &(data->next_timeout), sizeof(struct timeval));
 302                 timeleft.tv_sec -= timenow.tv_sec;
 303                 timeleft.tv_usec -= timenow.tv_usec;
 304                 if (timeleft.tv_usec < 0)
 305                         {
 306                         timeleft.tv_sec--;
 307                         timeleft.tv_usec += 1000000;
 308                         }
 309
 310                 if (timeleft.tv_sec < 0)
 311                         {
 312                         timeleft.tv_sec = 0;
 313                         timeleft.tv_usec = 1;
 314                         }
 315
 316                 /* Adjust socket timeout if next handhake message timer
 317                  * will expire earlier.
 318                  */
 319                 if ((data->socket_timeout.tv_sec == 0 && data->socket_timeout.tv_usec == 0) ||
 320                         (data->socket_timeout.tv_sec > timeleft.tv_sec) ||
 321                         (data->socket_timeout.tv_sec == timeleft.tv_sec &&
 322                          data->socket_timeout.tv_usec >= timeleft.tv_usec))
 323                         {
 324 #ifdef OPENSSL_SYS_WINDOWS
 325                         timeout = timeleft.tv_sec * 1000 + timeleft.tv_usec / 1000;
 326                         if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 327                                                    (void*)&timeout, sizeof(timeout)) < 0)
 328                                 { perror("setsockopt"); }
 329 #else
 330                         if ( setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, &timeleft,
 331                                                         sizeof(struct timeval)) < 0)
 332                                 { perror("setsockopt"); }
 333 #endif
 334                         }
 335                 }
 336 #endif
 337         }
 338
 339 static void dgram_reset_rcv_timeout(BIO *b)
 340         {
 341 #if defined(SO_RCVTIMEO)
 342         bio_dgram_data *data = (bio_dgram_data *)b->ptr;
 343
 344         /* Is a timer active? */
 345         if (data->next_timeout.tv_sec > 0 || data->next_timeout.tv_usec > 0)
 346                 {
 347 #ifdef OPENSSL_SYS_WINDOWS
 348                 int timeout = data->socket_timeout.tv_sec * 1000 +
 349                                           data->socket_timeout.tv_usec / 1000;
 350                 if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 351                                            (void*)&timeout, sizeof(timeout)) < 0)
 352                         { perror("setsockopt"); }
 353 #else
 354                 if ( setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, &(data->socket_timeout),
 355                                                 sizeof(struct timeval)) < 0)
 356                         { perror("setsockopt"); }
 357 #endif
 358                 }
 359 #endif
 360         }
 361
 362 static int dgram_read(BIO *b, char *out, int outl)
 363         {
 364         int ret=0;
 365         bio_dgram_data *data = (bio_dgram_data *)b->ptr;
 366
 367         struct  {
 368         /*
 369          * See commentary in b_sock.c. <appro>
 370          */
 371         union   { size_t s; int i; } len;
 372         union   {
 373                 struct sockaddr sa;
 374                 struct sockaddr_in sa_in;
 375 #if OPENSSL_USE_IPV6
 376                 struct sockaddr_in6 sa_in6;
 377 #endif
 378                 } peer;
 379         } sa;
 380
 381         sa.len.s=0;
 382         sa.len.i=sizeof(sa.peer);
 383
 384         if (out != NULL)
 385                 {
 386                 clear_socket_error();
 387                 memset(&sa.peer, 0x00, sizeof(sa.peer));
 388                 dgram_adjust_rcv_timeout(b);
 389                 ret=recvfrom(b->num,out,outl,0,&sa.peer.sa,(void *)&sa.len);
 390                 if (sizeof(sa.len.i)!=sizeof(sa.len.s) && sa.len.i==0)
 391                         {
 392                         OPENSSL_assert(sa.len.s<=sizeof(sa.peer));
 393                         sa.len.i = (int)sa.len.s;
 394                         }
 395
 396                 if ( ! data->connected  && ret >= 0)
 397                         BIO_ctrl(b, BIO_CTRL_DGRAM_SET_PEER, 0, &sa.peer);
 398
 399                 BIO_clear_retry_flags(b);
 400                 if (ret < 0)
 401                         {
 402                         if (BIO_dgram_should_retry(ret))
 403                                 {
 404                                 BIO_set_retry_read(b);
 405                                 data->_errno = get_last_socket_error();
 406                                 }
 407                         }
 408
 409                 dgram_reset_rcv_timeout(b);
 410                 }
 411         return(ret);
 412         }
 413
 414 static int dgram_write(BIO *b, const char *in, int inl)
 415         {
 416         int ret;
 417         bio_dgram_data *data = (bio_dgram_data *)b->ptr;
 418         clear_socket_error();
 419
 420         if ( data->connected )
 421                 ret=writesocket(b->num,in,inl);
 422         else
 423                 {
 424                 int peerlen = sizeof(data->peer);
 425
 426                 if (data->peer.sa.sa_family == AF_INET)
 427                         peerlen = sizeof(data->peer.sa_in);
 428 #if OPENSSL_USE_IPV6
 429                 else if (data->peer.sa.sa_family == AF_INET6)
 430                         peerlen = sizeof(data->peer.sa_in6);
 431 #endif
 432 #if defined(NETWARE_CLIB) && defined(NETWARE_BSDSOCK)
 433                 ret=sendto(b->num, (char *)in, inl, 0, &data->peer.sa, peerlen);
 434 #else
 435                 ret=sendto(b->num, in, inl, 0, &data->peer.sa, peerlen);
 436 #endif
 437                 }
 438
 439         BIO_clear_retry_flags(b);
 440         if (ret <= 0)
 441                 {
 442                 if (BIO_dgram_should_retry(ret))
 443                         {
 444                         BIO_set_retry_write(b);
 445                         data->_errno = get_last_socket_error();
 446
 447 #if 0 /* higher layers are responsible for querying MTU, if necessary */
 448                         if ( data->_errno == EMSGSIZE)
 449                                 /* retrieve the new MTU */
 450                                 BIO_ctrl(b, BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
 451 #endif
 452                         }
 453                 }
 454         return(ret);
 455         }
 456
 457 static long dgram_ctrl(BIO *b, int cmd, long num, void *ptr)
 458         {
 459         long ret=1;
 460         int *ip;
 461         struct sockaddr *to = NULL;
 462         bio_dgram_data *data = NULL;
 463         int sockopt_val = 0;
 464 #if defined(OPENSSL_SYS_LINUX) && (defined(IP_MTU_DISCOVER) || defined(IP_MTU))
 465         socklen_t sockopt_len;  /* assume that system supporting IP_MTU is
 466                                  * modern enough to define socklen_t */
 467         socklen_t addr_len;
 468         union   {
 469                 struct sockaddr sa;
 470                 struct sockaddr_in s4;
 471 #if OPENSSL_USE_IPV6
 472                 struct sockaddr_in6 s6;
 473 #endif
 474                 } addr;
 475 #endif
 476
 477         data = (bio_dgram_data *)b->ptr;
 478
 479         switch (cmd)
 480                 {
 481         case BIO_CTRL_RESET:
 482                 num=0;
 483         case BIO_C_FILE_SEEK:
 484                 ret=0;
 485                 break;
 486         case BIO_C_FILE_TELL:
 487         case BIO_CTRL_INFO:
 488                 ret=0;
 489                 break;
 490         case BIO_C_SET_FD:
 491                 dgram_clear(b);
 492                 b->num= *((int *)ptr);
 493                 b->shutdown=(int)num;
 494                 b->init=1;
 495                 break;
 496         case BIO_C_GET_FD:
 497                 if (b->init)
 498                         {
 499                         ip=(int *)ptr;
 500                         if (ip != NULL) *ip=b->num;
 501                         ret=b->num;
 502                         }
 503                 else
 504                         ret= -1;
 505                 break;
 506         case BIO_CTRL_GET_CLOSE:
 507                 ret=b->shutdown;
 508                 break;
 509         case BIO_CTRL_SET_CLOSE:
 510                 b->shutdown=(int)num;
 511                 break;
 512         case BIO_CTRL_PENDING:
 513         case BIO_CTRL_WPENDING:
 514                 ret=0;
 515                 break;
 516         case BIO_CTRL_DUP:
 517         case BIO_CTRL_FLUSH:
 518                 ret=1;
 519                 break;
 520         case BIO_CTRL_DGRAM_CONNECT:
 521                 to = (struct sockaddr *)ptr;
 522 #if 0
 523                 if (connect(b->num, to, sizeof(struct sockaddr)) < 0)
 524                         { perror("connect"); ret = 0; }
 525                 else
 526                         {
 527 #endif
 528                         switch (to->sa_family)
 529                                 {
 530                                 case AF_INET:
 531                                         memcpy(&data->peer,to,sizeof(data->peer.sa_in));
 532                                         break;
 533 #if OPENSSL_USE_IPV6
 534                                 case AF_INET6:
 535                                         memcpy(&data->peer,to,sizeof(data->peer.sa_in6));
 536                                         break;
 537 #endif
 538                                 default:
 539                                         memcpy(&data->peer,to,sizeof(data->peer.sa));
 540                                         break;
 541                                 }
 542 #if 0
 543                         }
 544 #endif
 545                 break;
 546                 /* (Linux)kernel sets DF bit on outgoing IP packets */
 547         case BIO_CTRL_DGRAM_MTU_DISCOVER:
 548 #if defined(OPENSSL_SYS_LINUX) && defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DO)
 549                 addr_len = (socklen_t)sizeof(addr);
 550                 memset((void *)&addr, 0, sizeof(addr));
 551                 if (getsockname(b->num, &addr.sa, &addr_len) < 0)
 552                         {
 553                         ret = 0;
 554                         break;
 555                         }
 556                 switch (addr.sa.sa_family)
 557                         {
 558                 case AF_INET:
 559                         sockopt_val = IP_PMTUDISC_DO;
 560                         if ((ret = setsockopt(b->num, IPPROTO_IP, IP_MTU_DISCOVER,
 561                                 &sockopt_val, sizeof(sockopt_val))) < 0)
 562                                 perror("setsockopt");
 563                         break;
 564 #if OPENSSL_USE_IPV6 && defined(IPV6_MTU_DISCOVER) && defined(IPV6_PMTUDISC_DO)
 565                 case AF_INET6:
 566                         sockopt_val = IPV6_PMTUDISC_DO;
 567                         if ((ret = setsockopt(b->num, IPPROTO_IPV6, IPV6_MTU_DISCOVER,
 568                                 &sockopt_val, sizeof(sockopt_val))) < 0)
 569                                 perror("setsockopt");
 570                         break;
 571 #endif
 572                 default:
 573                         ret = -1;
 574                         break;
 575                         }
 576                 ret = -1;
 577 #else
 578                 break;
 579 #endif
 580         case BIO_CTRL_DGRAM_QUERY_MTU:
 581 #if defined(OPENSSL_SYS_LINUX) && defined(IP_MTU)
 582                 addr_len = (socklen_t)sizeof(addr);
 583                 memset((void *)&addr, 0, sizeof(addr));
 584                 if (getsockname(b->num, &addr.sa, &addr_len) < 0)
 585                         {
 586                         ret = 0;
 587                         break;
 588                         }
 589                 sockopt_len = sizeof(sockopt_val);
 590                 switch (addr.sa.sa_family)
 591                         {
 592                 case AF_INET:
 593                         if ((ret = getsockopt(b->num, IPPROTO_IP, IP_MTU, (void *)&sockopt_val,
 594                                 &sockopt_len)) < 0 || sockopt_val < 0)
 595                                 {
 596                                 ret = 0;
 597                                 }
 598                         else
 599                                 {
 600                                 /* we assume that the transport protocol is UDP and no
 601                                  * IP options are used.
 602                                  */
 603                                 data->mtu = sockopt_val - 8 - 20;
 604                                 ret = data->mtu;
 605                                 }
 606                         break;
 607 #if OPENSSL_USE_IPV6 && defined(IPV6_MTU)
 608                 case AF_INET6:
 609                         if ((ret = getsockopt(b->num, IPPROTO_IPV6, IPV6_MTU, (void *)&sockopt_val,
 610                                 &sockopt_len)) < 0 || sockopt_val < 0)
 611                                 {
 612                                 ret = 0;
 613                                 }
 614                         else
 615                                 {
 616                                 /* we assume that the transport protocol is UDP and no
 617                                  * IPV6 options are used.
 618                                  */
 619                                 data->mtu = sockopt_val - 8 - 40;
 620                                 ret = data->mtu;
 621                                 }
 622                         break;
 623 #endif
 624                 default:
 625                         ret = 0;
 626                         break;
 627                         }
 628 #else
 629                 ret = 0;
 630 #endif
 631                 break;
 632         case BIO_CTRL_DGRAM_GET_FALLBACK_MTU:
 633                 switch (data->peer.sa.sa_family)
 634                         {
 635                         case AF_INET:
 636                                 ret = 576 - 20 - 8;
 637                                 break;
 638 #if OPENSSL_USE_IPV6
 639                         case AF_INET6:
 640 #ifdef IN6_IS_ADDR_V4MAPPED
 641                                 if (IN6_IS_ADDR_V4MAPPED(&data->peer.sa_in6.sin6_addr))
 642                                         ret = 576 - 20 - 8;
 643                                 else
 644 #endif
 645                                         ret = 1280 - 40 - 8;
 646                                 break;
 647 #endif
 648                         default:
 649                                 ret = 576 - 20 - 8;
 650                                 break;
 651                         }
 652                 break;
 653         case BIO_CTRL_DGRAM_GET_MTU:
 654                 return data->mtu;
 655                 break;
 656         case BIO_CTRL_DGRAM_SET_MTU:
 657                 data->mtu = num;
 658                 ret = num;
 659                 break;
 660         case BIO_CTRL_DGRAM_SET_CONNECTED:
 661                 to = (struct sockaddr *)ptr;
 662
 663                 if ( to != NULL)
 664                         {
 665                         data->connected = 1;
 666                         switch (to->sa_family)
 667                                 {
 668                                 case AF_INET:
 669                                         memcpy(&data->peer,to,sizeof(data->peer.sa_in));
 670                                         break;
 671 #if OPENSSL_USE_IPV6
 672                                 case AF_INET6:
 673                                         memcpy(&data->peer,to,sizeof(data->peer.sa_in6));
 674                                         break;
 675 #endif
 676                                 default:
 677                                         memcpy(&data->peer,to,sizeof(data->peer.sa));
 678                                         break;
 679                                 }
 680                         }
 681                 else
 682                         {
 683                         data->connected = 0;
 684                         memset(&(data->peer), 0x00, sizeof(data->peer));
 685                         }
 686                 break;
 687         case BIO_CTRL_DGRAM_GET_PEER:
 688                 switch (data->peer.sa.sa_family)
 689                         {
 690                         case AF_INET:
 691                                 ret=sizeof(data->peer.sa_in);
 692                                 break;
 693 #if OPENSSL_USE_IPV6
 694                         case AF_INET6:
 695                                 ret=sizeof(data->peer.sa_in6);
 696                                 break;
 697 #endif
 698                         default:
 699                                 ret=sizeof(data->peer.sa);
 700                                 break;
 701                         }
 702                 if (num==0 || num>ret)
 703                         num=ret;
 704                 memcpy(ptr,&data->peer,(ret=num));
 705                 break;
 706         case BIO_CTRL_DGRAM_SET_PEER:
 707                 to = (struct sockaddr *) ptr;
 708                 switch (to->sa_family)
 709                         {
 710                         case AF_INET:
 711                                 memcpy(&data->peer,to,sizeof(data->peer.sa_in));
 712                                 break;
 713 #if OPENSSL_USE_IPV6
 714                         case AF_INET6:
 715                                 memcpy(&data->peer,to,sizeof(data->peer.sa_in6));
 716                                 break;
 717 #endif
 718                         default:
 719                                 memcpy(&data->peer,to,sizeof(data->peer.sa));
 720                                 break;
 721                         }
 722                 break;
 723         case BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT:
 724                 memcpy(&(data->next_timeout), ptr, sizeof(struct timeval));
 725                 break;
 726 #if defined(SO_RCVTIMEO)
 727         case BIO_CTRL_DGRAM_SET_RECV_TIMEOUT:
 728 #ifdef OPENSSL_SYS_WINDOWS
 729                 {
 730                 struct timeval *tv = (struct timeval *)ptr;
 731                 int timeout = tv->tv_sec * 1000 + tv->tv_usec/1000;
 732                 if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 733                         (void*)&timeout, sizeof(timeout)) < 0)
 734                         { perror("setsockopt"); ret = -1; }
 735                 }
 736 #else
 737                 if ( setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, ptr,
 738                         sizeof(struct timeval)) < 0)
 739                         { perror("setsockopt"); ret = -1; }
 740 #endif
 741                 break;
 742         case BIO_CTRL_DGRAM_GET_RECV_TIMEOUT:
 743                 {
 744                 union { size_t s; int i; } sz = {0};
 745 #ifdef OPENSSL_SYS_WINDOWS
 746                 int timeout;
 747                 struct timeval *tv = (struct timeval *)ptr;
 748
 749                 sz.i = sizeof(timeout);
 750                 if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 751                         (void*)&timeout, &sz.i) < 0)
 752                         { perror("getsockopt"); ret = -1; }
 753                 else
 754                         {
 755                         tv->tv_sec = timeout / 1000;
 756                         tv->tv_usec = (timeout % 1000) * 1000;
 757                         ret = sizeof(*tv);
 758                         }
 759 #else
 760                 sz.i = sizeof(struct timeval);
 761                 if ( getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 762                         ptr, (void *)&sz) < 0)
 763                         { perror("getsockopt"); ret = -1; }
 764                 else if (sizeof(sz.s)!=sizeof(sz.i) && sz.i==0)
 765                         {
 766                         OPENSSL_assert(sz.s<=sizeof(struct timeval));
 767                         ret = (int)sz.s;
 768                         }
 769                 else
 770                         ret = sz.i;
 771 #endif
 772                 }
 773                 break;
 774 #endif
 775 #if defined(SO_SNDTIMEO)
 776         case BIO_CTRL_DGRAM_SET_SEND_TIMEOUT:
 777 #ifdef OPENSSL_SYS_WINDOWS
 778                 {
 779                 struct timeval *tv = (struct timeval *)ptr;
 780                 int timeout = tv->tv_sec * 1000 + tv->tv_usec/1000;
 781                 if (setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
 782                         (void*)&timeout, sizeof(timeout)) < 0)
 783                         { perror("setsockopt"); ret = -1; }
 784                 }
 785 #else
 786                 if ( setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO, ptr,
 787                         sizeof(struct timeval)) < 0)
 788                         { perror("setsockopt"); ret = -1; }
 789 #endif
 790                 break;
 791         case BIO_CTRL_DGRAM_GET_SEND_TIMEOUT:
 792                 {
 793                 union { size_t s; int i; } sz = {0};
 794 #ifdef OPENSSL_SYS_WINDOWS
 795                 int timeout;
 796                 struct timeval *tv = (struct timeval *)ptr;
 797
 798                 sz.i = sizeof(timeout);
 799                 if (getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
 800                         (void*)&timeout, &sz.i) < 0)
 801                         { perror("getsockopt"); ret = -1; }
 802                 else
 803                         {
 804                         tv->tv_sec = timeout / 1000;
 805                         tv->tv_usec = (timeout % 1000) * 1000;
 806                         ret = sizeof(*tv);
 807                         }
 808 #else
 809                 sz.i = sizeof(struct timeval);
 810                 if ( getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
 811                         ptr, (void *)&sz) < 0)
 812                         { perror("getsockopt"); ret = -1; }
 813                 else if (sizeof(sz.s)!=sizeof(sz.i) && sz.i==0)
 814                         {
 815                         OPENSSL_assert(sz.s<=sizeof(struct timeval));
 816                         ret = (int)sz.s;
 817                         }
 818                 else
 819                         ret = sz.i;
 820 #endif
 821                 }
 822                 break;
 823 #endif
 824         case BIO_CTRL_DGRAM_GET_SEND_TIMER_EXP:
 825                 /* fall-through */
 826         case BIO_CTRL_DGRAM_GET_RECV_TIMER_EXP:
 827 #ifdef OPENSSL_SYS_WINDOWS
 828                 if ( data->_errno == WSAETIMEDOUT)
 829 #else
 830                 if ( data->_errno == EAGAIN)
 831 #endif
 832                         {
 833                         ret = 1;
 834                         data->_errno = 0;
 835                         }
 836                 else
 837                         ret = 0;
 838                 break;
 839 #ifdef EMSGSIZE
 840         case BIO_CTRL_DGRAM_MTU_EXCEEDED:
 841                 if ( data->_errno == EMSGSIZE)
 842                         {
 843                         ret = 1;
 844                         data->_errno = 0;
 845                         }
 846                 else
 847                         ret = 0;
 848                 break;
 849 #endif
 850         case BIO_CTRL_DGRAM_SET_DONT_FRAG:
 851                 sockopt_val = num ? 1 : 0;
 852
 853                 switch (data->peer.sa.sa_family)
 854                         {
 855                         case AF_INET:
 856 #if defined(IP_DONTFRAG)
 857                                 if ((ret = setsockopt(b->num, IPPROTO_IP, IP_DONTFRAG,
 858                                         &sockopt_val, sizeof(sockopt_val))) < 0)
 859                                         { perror("setsockopt"); ret = -1; }
 860 #elif defined(OPENSSL_SYS_LINUX) && defined(IP_MTUDISCOVER)
 861                                 if ((sockopt_val = num ? IP_PMTUDISC_PROBE : IP_PMTUDISC_DONT),
 862                                     (ret = setsockopt(b->num, IPPROTO_IP, IP_MTU_DISCOVER,
 863                                         &sockopt_val, sizeof(sockopt_val))) < 0)
 864                                         { perror("setsockopt"); ret = -1; }
 865 #elif defined(OPENSSL_SYS_WINDOWS) && defined(IP_DONTFRAGMENT)
 866                                 if ((ret = setsockopt(b->num, IPPROTO_IP, IP_DONTFRAGMENT,
 867                                         (const char *)&sockopt_val, sizeof(sockopt_val))) < 0)
 868                                         { perror("setsockopt"); ret = -1; }
 869 #else
 870                                 ret = -1;
 871 #endif
 872                                 break;
 873 #if OPENSSL_USE_IPV6
 874                         case AF_INET6:
 875 #if defined(IPV6_DONTFRAG)
 876                                 if ((ret = setsockopt(b->num, IPPROTO_IPV6, IPV6_DONTFRAG,
 877                                         &sockopt_val, sizeof(sockopt_val))) < 0)
 878                                         { perror("setsockopt"); ret = -1; }
 879 #elif defined(OPENSSL_SYS_LINUX) && defined(IPV6_MTUDISCOVER)
 880                                 if ((sockopt_val = num ? IP_PMTUDISC_PROBE : IP_PMTUDISC_DONT),
 881                                     (ret = setsockopt(b->num, IPPROTO_IPV6, IPV6_MTU_DISCOVER,
 882                                         &sockopt_val, sizeof(sockopt_val))) < 0)
 883                                         { perror("setsockopt"); ret = -1; }
 884 #else
 885                                 ret = -1;
 886 #endif
 887                                 break;
 888 #endif
 889                         default:
 890                                 ret = -1;
 891                                 break;
 892                         }
 893                 break;
 894         default:
 895                 ret=0;
 896                 break;
 897                 }
 898         return(ret);
 899         }
 900
 901 static int dgram_puts(BIO *bp, const char *str)
 902         {
 903         int n,ret;
 904
 905         n=strlen(str);
 906         ret=dgram_write(bp,str,n);
 907         return(ret);
 908         }
 909
 910 #ifndef OPENSSL_NO_SCTP
 911 BIO_METHOD *BIO_s_datagram_sctp(void)
 912         {
 913         return(&methods_dgramp_sctp);
 914         }
 915
 916 BIO *BIO_new_dgram_sctp(int fd, int close_flag)
 917         {
 918         BIO *bio;
 919         int ret, optval = 20000;
 920         int auth_data = 0, auth_forward = 0;
 921         unsigned char *p;
 922         struct sctp_authchunk auth;
 923         struct sctp_authchunks *authchunks;
 924         socklen_t sockopt_len;
 925 #ifdef SCTP_AUTHENTICATION_EVENT
 926 #ifdef SCTP_EVENT
 927         struct sctp_event event;
 928 #else
 929         struct sctp_event_subscribe event;
 930 #endif
 931 #endif
 932
 933         bio=BIO_new(BIO_s_datagram_sctp());
 934         if (bio == NULL) return(NULL);
 935         BIO_set_fd(bio,fd,close_flag);
 936
 937         /* Activate SCTP-AUTH for DATA and FORWARD-TSN chunks */
 938         auth.sauth_chunk = OPENSSL_SCTP_DATA_CHUNK_TYPE;
 939         ret = setsockopt(fd, IPPROTO_SCTP, SCTP_AUTH_CHUNK, &auth, sizeof(struct sctp_authchunk));
 940         OPENSSL_assert(ret >= 0);
 941         auth.sauth_chunk = OPENSSL_SCTP_FORWARD_CUM_TSN_CHUNK_TYPE;
 942         ret = setsockopt(fd, IPPROTO_SCTP, SCTP_AUTH_CHUNK, &auth, sizeof(struct sctp_authchunk));
 943         OPENSSL_assert(ret >= 0);
 944
 945         /* Test if activation was successful. When using accept(),
 946          * SCTP-AUTH has to be activated for the listening socket
 947          * already, otherwise the connected socket won't use it. */
 948         sockopt_len = (socklen_t)(sizeof(sctp_assoc_t) + 256 * sizeof(uint8_t));
 949         authchunks = OPENSSL_malloc(sockopt_len);
 950         memset(authchunks, 0, sizeof(sockopt_len));
 951         ret = getsockopt(fd, IPPROTO_SCTP, SCTP_LOCAL_AUTH_CHUNKS, authchunks, &sockopt_len);
 952         OPENSSL_assert(ret >= 0);
 953
 954         for (p = (unsigned char*) authchunks + sizeof(sctp_assoc_t);
 955              p < (unsigned char*) authchunks + sockopt_len;
 956              p += sizeof(uint8_t))
 957                 {
 958                 if (*p == OPENSSL_SCTP_DATA_CHUNK_TYPE) auth_data = 1;
 959                 if (*p == OPENSSL_SCTP_FORWARD_CUM_TSN_CHUNK_TYPE) auth_forward = 1;
 960                 }
 961
 962         OPENSSL_free(authchunks);
 963
 964         OPENSSL_assert(auth_data);
 965         OPENSSL_assert(auth_forward);
 966
 967 #ifdef SCTP_AUTHENTICATION_EVENT
 968 #ifdef SCTP_EVENT
 969         memset(&event, 0, sizeof(struct sctp_event));
 970         event.se_assoc_id = 0;
 971         event.se_type = SCTP_AUTHENTICATION_EVENT;
 972         event.se_on = 1;
 973         ret = setsockopt(fd, IPPROTO_SCTP, SCTP_EVENT, &event, sizeof(struct sctp_event));
 974         OPENSSL_assert(ret >= 0);
 975 #else
 976         sockopt_len = (socklen_t) sizeof(struct sctp_event_subscribe);
 977         ret = getsockopt(fd, IPPROTO_SCTP, SCTP_EVENTS, &event, &sockopt_len);
 978         OPENSSL_assert(ret >= 0);
 979
 980         event.sctp_authentication_event = 1;
 981
 982         ret = setsockopt(fd, IPPROTO_SCTP, SCTP_EVENTS, &event, sizeof(struct sctp_event_subscribe));
 983         OPENSSL_assert(ret >= 0);
 984 #endif
 985 #endif
 986
 987         /* Disable partial delivery by setting the min size
 988          * larger than the max record size of 2^14 + 2048 + 13
 989          */
 990         ret = setsockopt(fd, IPPROTO_SCTP, SCTP_PARTIAL_DELIVERY_POINT, &optval, sizeof(optval));
 991         OPENSSL_assert(ret >= 0);
 992
 993         return(bio);
 994         }
 995
 996 int BIO_dgram_is_sctp(BIO *bio)
 997         {
 998         return (BIO_method_type(bio) == BIO_TYPE_DGRAM_SCTP);
 999         }
1000
1001 static int dgram_sctp_new(BIO *bi)
1002         {
1003         bio_dgram_sctp_data *data = NULL;
1004
1005         bi->init=0;
1006         bi->num=0;
1007         data = OPENSSL_malloc(sizeof(bio_dgram_sctp_data));
1008         if (data == NULL)
1009                 return 0;
1010         memset(data, 0x00, sizeof(bio_dgram_sctp_data));
1011 #ifdef SCTP_PR_SCTP_NONE
1012         data->prinfo.pr_policy = SCTP_PR_SCTP_NONE;
1013 #endif
1014     bi->ptr = data;
1015
1016         bi->flags=0;
1017         return(1);
1018         }
1019
1020 static int dgram_sctp_free(BIO *a)
1021         {
1022         bio_dgram_sctp_data *data;
1023
1024         if (a == NULL) return(0);
1025         if ( ! dgram_clear(a))
1026                 return 0;
1027
1028         data = (bio_dgram_sctp_data *)a->ptr;
1029         if(data != NULL) OPENSSL_free(data);
1030
1031         return(1);
1032         }
1033
1034 #ifdef SCTP_AUTHENTICATION_EVENT
1035 void dgram_sctp_handle_auth_free_key_event(BIO *b, union sctp_notification *snp)
1036         {
1037         int ret;
1038         struct sctp_authkey_event* authkeyevent = &snp->sn_auth_event;
1039
1040         if (authkeyevent->auth_indication == SCTP_AUTH_FREE_KEY)
1041                 {
1042                 struct sctp_authkeyid authkeyid;
1043
1044                 /* delete key */
1045                 authkeyid.scact_keynumber = authkeyevent->auth_keynumber;
1046                 ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_DELETE_KEY,
1047                       &authkeyid, sizeof(struct sctp_authkeyid));
1048                 }
1049         }
1050 #endif
1051
1052 static int dgram_sctp_read(BIO *b, char *out, int outl)
1053         {
1054         int ret = 0, n = 0, i, optval;
1055         socklen_t optlen;
1056         bio_dgram_sctp_data *data = (bio_dgram_sctp_data *)b->ptr;
1057         union sctp_notification *snp;
1058         struct msghdr msg;
1059         struct iovec iov;
1060         struct cmsghdr *cmsg;
1061         char cmsgbuf[512];
1062
1063         if (out != NULL)
1064                 {
1065                 clear_socket_error();
1066
1067                 do
1068                         {
1069                         memset(&data->rcvinfo, 0x00, sizeof(struct bio_dgram_sctp_rcvinfo));
1070                         iov.iov_base = out;
1071                         iov.iov_len = outl;
1072                         msg.msg_name = NULL;
1073                         msg.msg_namelen = 0;
1074                         msg.msg_iov = &iov;
1075                         msg.msg_iovlen = 1;
1076                         msg.msg_control = cmsgbuf;
1077                         msg.msg_controllen = 512;
1078                         msg.msg_flags = 0;
1079                         n = recvmsg(b->num, &msg, 0);
1080
1081                         if (msg.msg_controllen > 0)
1082                                 {
1083                                 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg))
1084                                         {
1085                                         if (cmsg->cmsg_level != IPPROTO_SCTP)
1086                                                 continue;
1087 #ifdef SCTP_RCVINFO
1088                                         if (cmsg->cmsg_type == SCTP_RCVINFO)
1089                                                 {
1090                                                 struct sctp_rcvinfo *rcvinfo;
1091
1092                                                 rcvinfo = (struct sctp_rcvinfo *)CMSG_DATA(cmsg);
1093                                                 data->rcvinfo.rcv_sid = rcvinfo->rcv_sid;
1094                                                 data->rcvinfo.rcv_ssn = rcvinfo->rcv_ssn;
1095                                                 data->rcvinfo.rcv_flags = rcvinfo->rcv_flags;
1096                                                 data->rcvinfo.rcv_ppid = rcvinfo->rcv_ppid;
1097                                                 data->rcvinfo.rcv_tsn = rcvinfo->rcv_tsn;
1098                                                 data->rcvinfo.rcv_cumtsn = rcvinfo->rcv_cumtsn;
1099                                                 data->rcvinfo.rcv_context = rcvinfo->rcv_context;
1100                                                 }
1101 #endif
1102 #ifdef SCTP_SNDRCV
1103                                         if (cmsg->cmsg_type == SCTP_SNDRCV)
1104                                                 {
1105                                                 struct sctp_sndrcvinfo *sndrcvinfo;
1106
1107                                                 sndrcvinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
1108                                                 data->rcvinfo.rcv_sid = sndrcvinfo->sinfo_stream;
1109                                                 data->rcvinfo.rcv_ssn = sndrcvinfo->sinfo_ssn;
1110                                                 data->rcvinfo.rcv_flags = sndrcvinfo->sinfo_flags;
1111                                                 data->rcvinfo.rcv_ppid = sndrcvinfo->sinfo_ppid;
1112                                                 data->rcvinfo.rcv_tsn = sndrcvinfo->sinfo_tsn;
1113                                                 data->rcvinfo.rcv_cumtsn = sndrcvinfo->sinfo_cumtsn;
1114                                                 data->rcvinfo.rcv_context = sndrcvinfo->sinfo_context;
1115                                                 }
1116 #endif
1117                                         }
1118                                 }
1119
1120                         if (n <= 0)
1121                                 {
1122                                 if (n < 0)
1123                                         ret = n;
1124                                 break;
1125                                 }
1126
1127                         if (msg.msg_flags & MSG_NOTIFICATION)
1128                                 {
1129                                 snp = (union sctp_notification*) out;
1130                                 if (snp->sn_header.sn_type == SCTP_SENDER_DRY_EVENT)
1131                                         {
1132 #ifdef SCTP_EVENT
1133                                         struct sctp_event event;
1134 #else
1135                                         struct sctp_event_subscribe event;
1136                                         socklen_t eventsize;
1137 #endif
1138                                         /* If a message has been delayed until the socket
1139                                          * is dry, it can be sent now.
1140                                          */
1141                                         if (data->saved_message.length > 0)
1142                                                 {
1143                                                 dgram_sctp_write(data->saved_message.bio, data->saved_message.data,
1144                                                                  data->saved_message.length);
1145                                                 OPENSSL_free(data->saved_message.data);
1146                                                 data->saved_message.length = 0;
1147                                                 }
1148
1149                                         /* disable sender dry event */
1150 #ifdef SCTP_EVENT
1151                                         memset(&event, 0, sizeof(struct sctp_event));
1152                                         event.se_assoc_id = 0;
1153                                         event.se_type = SCTP_SENDER_DRY_EVENT;
1154                                         event.se_on = 0;
1155                                         i = setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENT, &event, sizeof(struct sctp_event));
1156                                         OPENSSL_assert(i >= 0);
1157 #else
1158                                         eventsize = sizeof(struct sctp_event_subscribe);
1159                                         i = getsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event, &eventsize);
1160                                         OPENSSL_assert(i >= 0);
1161
1162                                         event.sctp_sender_dry_event = 0;
1163
1164                                         i = setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event, sizeof(struct sctp_event_subscribe));
1165                                         OPENSSL_assert(i >= 0);
1166 #endif
1167                                         }
1168
1169 #ifdef SCTP_AUTHENTICATION_EVENT
1170                                 if (snp->sn_header.sn_type == SCTP_AUTHENTICATION_EVENT)
1171                                         dgram_sctp_handle_auth_free_key_event(b, snp);
1172 #endif
1173
1174                                 if (data->handle_notifications != NULL)
1175                                         data->handle_notifications(b, data->notification_context, (void*) out);
1176
1177                                 memset(out, 0, outl);
1178                                 }
1179                         else
1180                                 ret += n;
1181                         }
1182                 while ((msg.msg_flags & MSG_NOTIFICATION) && (msg.msg_flags & MSG_EOR) && (ret < outl));
1183
1184                 if (ret > 0 && !(msg.msg_flags & MSG_EOR))
1185                         {
1186                         /* Partial message read, this should never happen! */
1187
1188                         /* The buffer was too small, this means the peer sent
1189                          * a message that was larger than allowed. */
1190                         if (ret == outl)
1191                                 return -1;
1192
1193                         /* Test if socket buffer can handle max record
1194                          * size (2^14 + 2048 + 13)
1195                          */
1196                         optlen = (socklen_t) sizeof(int);
1197                         ret = getsockopt(b->num, SOL_SOCKET, SO_RCVBUF, &optval, &optlen);
1198                         OPENSSL_assert(ret >= 0);
1199                         OPENSSL_assert(optval >= 18445);
1200
1201                         /* Test if SCTP doesn't partially deliver below
1202                          * max record size (2^14 + 2048 + 13)
1203                          */
1204                         optlen = (socklen_t) sizeof(int);
1205                         ret = getsockopt(b->num, IPPROTO_SCTP, SCTP_PARTIAL_DELIVERY_POINT,
1206                                          &optval, &optlen);
1207                         OPENSSL_assert(ret >= 0);
1208                         OPENSSL_assert(optval >= 18445);
1209
1210                         /* Partially delivered notification??? Probably a bug.... */
1211                         OPENSSL_assert(!(msg.msg_flags & MSG_NOTIFICATION));
1212
1213                         /* Everything seems ok till now, so it's most likely
1214                          * a message dropped by PR-SCTP.
1215                          */
1216                         memset(out, 0, outl);
1217                         BIO_set_retry_read(b);
1218                         return -1;
1219                         }
1220
1221                 BIO_clear_retry_flags(b);
1222                 if (ret < 0)
1223                         {
1224                         if (BIO_dgram_should_retry(ret))
1225                                 {
1226                                 BIO_set_retry_read(b);
1227                                 data->_errno = get_last_socket_error();
1228                                 }
1229                         }
1230
1231                 /* Test if peer uses SCTP-AUTH before continuing */
1232                 if (!data->peer_auth_tested)
1233                         {
1234                         int ii, auth_data = 0, auth_forward = 0;
1235                         unsigned char *p;
1236                         struct sctp_authchunks *authchunks;
1237
1238                         optlen = (socklen_t)(sizeof(sctp_assoc_t) + 256 * sizeof(uint8_t));
1239                         authchunks = OPENSSL_malloc(optlen);
1240                         memset(authchunks, 0, sizeof(optlen));
1241                         ii = getsockopt(b->num, IPPROTO_SCTP, SCTP_PEER_AUTH_CHUNKS, authchunks, &optlen);
1242                         OPENSSL_assert(ii >= 0);
1243
1244                         for (p = (unsigned char*) authchunks + sizeof(sctp_assoc_t);
1245                                  p < (unsigned char*) authchunks + optlen;
1246                                  p += sizeof(uint8_t))
1247                                 {
1248                                 if (*p == OPENSSL_SCTP_DATA_CHUNK_TYPE) auth_data = 1;
1249                                 if (*p == OPENSSL_SCTP_FORWARD_CUM_TSN_CHUNK_TYPE) auth_forward = 1;
1250                                 }
1251
1252                         OPENSSL_free(authchunks);
1253
1254                         if (!auth_data || !auth_forward)
1255                                 {
1256                                 BIOerr(BIO_F_DGRAM_SCTP_READ,BIO_R_CONNECT_ERROR);
1257                                 return -1;
1258                                 }
1259
1260                         data->peer_auth_tested = 1;
1261                         }
1262                 }
1263         return(ret);
1264         }
1265
1266 static int dgram_sctp_write(BIO *b, const char *in, int inl)
1267         {
1268         int ret;
1269         bio_dgram_sctp_data *data = (bio_dgram_sctp_data *)b->ptr;
1270         struct bio_dgram_sctp_sndinfo *sinfo = &(data->sndinfo);
1271         struct bio_dgram_sctp_prinfo *pinfo = &(data->prinfo);
1272         struct bio_dgram_sctp_sndinfo handshake_sinfo;
1273         struct iovec iov[1];
1274         struct msghdr msg;
1275         struct cmsghdr *cmsg;
1276 #if defined(SCTP_SNDINFO) && defined(SCTP_PRINFO)
1277         char cmsgbuf[CMSG_SPACE(sizeof(struct sctp_sndinfo)) + CMSG_SPACE(sizeof(struct sctp_prinfo))];
1278         struct sctp_sndinfo *sndinfo;
1279         struct sctp_prinfo *prinfo;
1280 #else
1281         char cmsgbuf[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))];
1282         struct sctp_sndrcvinfo *sndrcvinfo;
1283 #endif
1284
1285         clear_socket_error();
1286
1287         /* If we're send anything else than application data,
1288          * disable all user parameters and flags.
1289          */
1290         if (in[0] != 23) {
1291                 memset(&handshake_sinfo, 0x00, sizeof(struct bio_dgram_sctp_sndinfo));
1292 #ifdef SCTP_SACK_IMMEDIATELY
1293                 handshake_sinfo.snd_flags = SCTP_SACK_IMMEDIATELY;
1294 #endif
1295                 sinfo = &handshake_sinfo;
1296         }
1297
1298         /* If we have to send a shutdown alert message and the
1299          * socket is not dry yet, we have to save it and send it
1300          * as soon as the socket gets dry.
1301          */
1302         if (data->save_shutdown && !BIO_dgram_sctp_wait_for_dry(b))
1303         {
1304                 data->saved_message.bio = b;
1305                 data->saved_message.length = inl;
1306                 data->saved_message.data = OPENSSL_malloc(inl);
1307                 memcpy(data->saved_message.data, in, inl);
1308                 return inl;
1309         }
1310
1311         iov[0].iov_base = (char *)in;
1312         iov[0].iov_len = inl;
1313         msg.msg_name = NULL;
1314         msg.msg_namelen = 0;
1315         msg.msg_iov = iov;
1316         msg.msg_iovlen = 1;
1317         msg.msg_control = (caddr_t)cmsgbuf;
1318         msg.msg_controllen = 0;
1319         msg.msg_flags = 0;
1320 #if defined(SCTP_SNDINFO) && defined(SCTP_PRINFO)
1321         cmsg = (struct cmsghdr *)cmsgbuf;
1322         cmsg->cmsg_level = IPPROTO_SCTP;
1323         cmsg->cmsg_type = SCTP_SNDINFO;
1324         cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndinfo));
1325         sndinfo = (struct sctp_sndinfo *)CMSG_DATA(cmsg);
1326         memset(sndinfo, 0, sizeof(struct sctp_sndinfo));
1327         sndinfo->snd_sid = sinfo->snd_sid;
1328         sndinfo->snd_flags = sinfo->snd_flags;
1329         sndinfo->snd_ppid = sinfo->snd_ppid;
1330         sndinfo->snd_context = sinfo->snd_context;
1331         msg.msg_controllen += CMSG_SPACE(sizeof(struct sctp_sndinfo));
1332
1333         cmsg = (struct cmsghdr *)&cmsgbuf[CMSG_SPACE(sizeof(struct sctp_sndinfo))];
1334         cmsg->cmsg_level = IPPROTO_SCTP;
1335         cmsg->cmsg_type = SCTP_PRINFO;
1336         cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_prinfo));
1337         prinfo = (struct sctp_prinfo *)CMSG_DATA(cmsg);
1338         memset(prinfo, 0, sizeof(struct sctp_prinfo));
1339         prinfo->pr_policy = pinfo->pr_policy;
1340         prinfo->pr_value = pinfo->pr_value;
1341         msg.msg_controllen += CMSG_SPACE(sizeof(struct sctp_prinfo));
1342 #else
1343         cmsg = (struct cmsghdr *)cmsgbuf;
1344         cmsg->cmsg_level = IPPROTO_SCTP;
1345         cmsg->cmsg_type = SCTP_SNDRCV;
1346         cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo));
1347         sndrcvinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
1348         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
1349         sndrcvinfo->sinfo_stream = sinfo->snd_sid;
1350         sndrcvinfo->sinfo_flags = sinfo->snd_flags;
1351 #ifdef __FreeBSD__
1352         sndrcvinfo->sinfo_flags |= pinfo->pr_policy;
1353 #endif
1354         sndrcvinfo->sinfo_ppid = sinfo->snd_ppid;
1355         sndrcvinfo->sinfo_context = sinfo->snd_context;
1356         sndrcvinfo->sinfo_timetolive = pinfo->pr_value;
1357         msg.msg_controllen += CMSG_SPACE(sizeof(struct sctp_sndrcvinfo));
1358 #endif
1359
1360         ret = sendmsg(b->num, &msg, 0);
1361
1362         BIO_clear_retry_flags(b);
1363         if (ret <= 0)
1364                 {
1365                 if (BIO_dgram_should_retry(ret))
1366                         {
1367                         BIO_set_retry_write(b);
1368                         data->_errno = get_last_socket_error();
1369                         }
1370                 }
1371         return(ret);
1372         }
1373
1374 static long dgram_sctp_ctrl(BIO *b, int cmd, long num, void *ptr)
1375         {
1376         long ret=1;
1377         bio_dgram_sctp_data *data = NULL;
1378         socklen_t sockopt_len = 0;
1379         struct sctp_authkeyid authkeyid;
1380         struct sctp_authkey *authkey;
1381
1382         data = (bio_dgram_sctp_data *)b->ptr;
1383
1384         switch (cmd)
1385                 {
1386         case BIO_CTRL_DGRAM_QUERY_MTU:
1387                 /* Set to maximum (2^14)
1388                  * and ignore user input to enable transport
1389                  * protocol fragmentation.
1390                  * Returns always 2^14.
1391                  */
1392                 data->mtu = 16384;
1393                 ret = data->mtu;
1394                 break;
1395         case BIO_CTRL_DGRAM_SET_MTU:
1396                 /* Set to maximum (2^14)
1397                  * and ignore input to enable transport
1398                  * protocol fragmentation.
1399                  * Returns always 2^14.
1400                  */
1401                 data->mtu = 16384;
1402                 ret = data->mtu;
1403                 break;
1404         case BIO_CTRL_DGRAM_SET_CONNECTED:
1405         case BIO_CTRL_DGRAM_CONNECT:
1406                 /* Returns always -1. */
1407                 ret = -1;
1408                 break;
1409         case BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT:
1410                 /* SCTP doesn't need the DTLS timer
1411                  * Returns always 1.
1412                  */
1413                 break;
1414         case BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE:
1415                 if (num > 0)
1416                         data->in_handshake = 1;
1417                 else
1418                         data->in_handshake = 0;
1419
1420                 ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_NODELAY, &data->in_handshake, sizeof(int));
1421                 break;
1422         case BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY:
1423                 /* New shared key for SCTP AUTH.
1424                  * Returns 0 on success, -1 otherwise.
1425                  */
1426
1427                 /* Get active key */
1428                 sockopt_len = sizeof(struct sctp_authkeyid);
1429                 ret = getsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY, &authkeyid, &sockopt_len);
1430                 if (ret < 0) break;
1431
1432                 /* Add new key */
1433                 sockopt_len = sizeof(struct sctp_authkey) + 64 * sizeof(uint8_t);
1434                 authkey = OPENSSL_malloc(sockopt_len);
1435                 memset(authkey, 0x00, sockopt_len);
1436                 authkey->sca_keynumber = authkeyid.scact_keynumber + 1;
1437 #ifndef __FreeBSD__
1438                 /* This field is missing in FreeBSD 8.2 and earlier,
1439                  * and FreeBSD 8.3 and higher work without it.
1440                  */
1441                 authkey->sca_keylength = 64;
1442 #endif
1443                 memcpy(&authkey->sca_key[0], ptr, 64 * sizeof(uint8_t));
1444
1445                 ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_KEY, authkey, sockopt_len);
1446                 if (ret < 0) break;
1447
1448                 /* Reset active key */
1449                 ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY,
1450                       &authkeyid, sizeof(struct sctp_authkeyid));
1451                 if (ret < 0) break;
1452
1453                 break;
1454         case BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY:
1455                 /* Returns 0 on success, -1 otherwise. */
1456
1457                 /* Get active key */
1458                 sockopt_len = sizeof(struct sctp_authkeyid);
1459                 ret = getsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY, &authkeyid, &sockopt_len);
1460                 if (ret < 0) break;
1461
1462                 /* Set active key */
1463                 authkeyid.scact_keynumber = authkeyid.scact_keynumber + 1;
1464                 ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY,
1465                       &authkeyid, sizeof(struct sctp_authkeyid));
1466                 if (ret < 0) break;
1467
1468                 /* CCS has been sent, so remember that and fall through
1469                  * to check if we need to deactivate an old key
1470                  */
1471                 data->ccs_sent = 1;
1472
1473         case BIO_CTRL_DGRAM_SCTP_AUTH_CCS_RCVD:
1474                 /* Returns 0 on success, -1 otherwise. */
1475
1476                 /* Has this command really been called or is this just a fall-through? */
1477                 if (cmd == BIO_CTRL_DGRAM_SCTP_AUTH_CCS_RCVD)
1478                         data->ccs_rcvd = 1;
1479
1480                 /* CSS has been both, received and sent, so deactivate an old key */
1481                 if (data->ccs_rcvd == 1 && data->ccs_sent == 1)
1482                         {
1483                         /* Get active key */
1484                         sockopt_len = sizeof(struct sctp_authkeyid);
1485                         ret = getsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY, &authkeyid, &sockopt_len);
1486                         if (ret < 0) break;
1487
1488                         /* Deactivate key or delete second last key if
1489                          * SCTP_AUTHENTICATION_EVENT is not available.
1490                          */
1491                         authkeyid.scact_keynumber = authkeyid.scact_keynumber - 1;
1492 #ifdef SCTP_AUTH_DEACTIVATE_KEY
1493                         sockopt_len = sizeof(struct sctp_authkeyid);
1494                         ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_DEACTIVATE_KEY,
1495                               &authkeyid, sockopt_len);
1496                         if (ret < 0) break;
1497 #endif
1498 #ifndef SCTP_AUTHENTICATION_EVENT
1499                         if (authkeyid.scact_keynumber > 0)
1500                                 {
1501                                 authkeyid.scact_keynumber = authkeyid.scact_keynumber - 1;
1502                                 ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_DELETE_KEY,
1503                                           &authkeyid, sizeof(struct sctp_authkeyid));
1504                                 if (ret < 0) break;
1505                                 }
1506 #endif
1507
1508                         data->ccs_rcvd = 0;
1509                         data->ccs_sent = 0;
1510                         }
1511                 break;
1512         case BIO_CTRL_DGRAM_SCTP_GET_SNDINFO:
1513                 /* Returns the size of the copied struct. */
1514                 if (num > (long) sizeof(struct bio_dgram_sctp_sndinfo))
1515                         num = sizeof(struct bio_dgram_sctp_sndinfo);
1516
1517                 memcpy(ptr, &(data->sndinfo), num);
1518                 ret = num;
1519                 break;
1520         case BIO_CTRL_DGRAM_SCTP_SET_SNDINFO:
1521                 /* Returns the size of the copied struct. */
1522                 if (num > (long) sizeof(struct bio_dgram_sctp_sndinfo))
1523                         num = sizeof(struct bio_dgram_sctp_sndinfo);
1524
1525                 memcpy(&(data->sndinfo), ptr, num);
1526                 break;
1527         case BIO_CTRL_DGRAM_SCTP_GET_RCVINFO:
1528                 /* Returns the size of the copied struct. */
1529                 if (num > (long) sizeof(struct bio_dgram_sctp_rcvinfo))
1530                         num = sizeof(struct bio_dgram_sctp_rcvinfo);
1531
1532                 memcpy(ptr, &data->rcvinfo, num);
1533
1534                 ret = num;
1535                 break;
1536         case BIO_CTRL_DGRAM_SCTP_SET_RCVINFO:
1537                 /* Returns the size of the copied struct. */
1538                 if (num > (long) sizeof(struct bio_dgram_sctp_rcvinfo))
1539                         num = sizeof(struct bio_dgram_sctp_rcvinfo);
1540
1541                 memcpy(&(data->rcvinfo), ptr, num);
1542                 break;
1543         case BIO_CTRL_DGRAM_SCTP_GET_PRINFO:
1544                 /* Returns the size of the copied struct. */
1545                 if (num > (long) sizeof(struct bio_dgram_sctp_prinfo))
1546                         num = sizeof(struct bio_dgram_sctp_prinfo);
1547
1548                 memcpy(ptr, &(data->prinfo), num);
1549                 ret = num;
1550                 break;
1551         case BIO_CTRL_DGRAM_SCTP_SET_PRINFO:
1552                 /* Returns the size of the copied struct. */
1553                 if (num > (long) sizeof(struct bio_dgram_sctp_prinfo))
1554                         num = sizeof(struct bio_dgram_sctp_prinfo);
1555
1556                 memcpy(&(data->prinfo), ptr, num);
1557                 break;
1558         case BIO_CTRL_DGRAM_SCTP_SAVE_SHUTDOWN:
1559                 /* Returns always 1. */
1560                 if (num > 0)
1561                         data->save_shutdown = 1;
1562                 else
1563                         data->save_shutdown = 0;
1564                 break;
1565
1566         default:
1567                 /* Pass to default ctrl function to
1568                  * process SCTP unspecific commands
1569                  */
1570                 ret=dgram_ctrl(b, cmd, num, ptr);
1571                 break;
1572                 }
1573         return(ret);
1574         }
1575
1576 int BIO_dgram_sctp_notification_cb(BIO *b,
1577                                    void (*handle_notifications)(BIO *bio, void *context, void *buf),
1578                                    void *context)
1579         {
1580         bio_dgram_sctp_data *data = (bio_dgram_sctp_data *) b->ptr;
1581
1582         if (handle_notifications != NULL)
1583                 {
1584                 data->handle_notifications = handle_notifications;
1585                 data->notification_context = context;
1586                 }
1587         else
1588                 return -1;
1589
1590         return 0;
1591         }
1592
1593 int BIO_dgram_sctp_wait_for_dry(BIO *b)
1594 {
1595         int is_dry = 0;
1596         int n, sockflags, ret;
1597         union sctp_notification snp;
1598         struct msghdr msg;
1599         struct iovec iov;
1600 #ifdef SCTP_EVENT
1601         struct sctp_event event;
1602 #else
1603         struct sctp_event_subscribe event;
1604         socklen_t eventsize;
1605 #endif
1606         bio_dgram_sctp_data *data = (bio_dgram_sctp_data *)b->ptr;
1607
1608         /* set sender dry event */
1609 #ifdef SCTP_EVENT
1610         memset(&event, 0, sizeof(struct sctp_event));
1611         event.se_assoc_id = 0;
1612         event.se_type = SCTP_SENDER_DRY_EVENT;
1613         event.se_on = 1;
1614         ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENT, &event, sizeof(struct sctp_event));
1615 #else
1616         eventsize = sizeof(struct sctp_event_subscribe);
1617         ret = getsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event, &eventsize);
1618         if (ret < 0)
1619                 return -1;
1620
1621         event.sctp_sender_dry_event = 1;
1622
1623         ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event, sizeof(struct sctp_event_subscribe));
1624 #endif
1625         if (ret < 0)
1626                 return -1;
1627
1628         /* peek for notification */
1629         memset(&snp, 0x00, sizeof(union sctp_notification));
1630         iov.iov_base = (char *)&snp;
1631         iov.iov_len = sizeof(union sctp_notification);
1632         msg.msg_name = NULL;
1633         msg.msg_namelen = 0;
1634         msg.msg_iov = &iov;
1635         msg.msg_iovlen = 1;
1636         msg.msg_control = NULL;
1637         msg.msg_controllen = 0;
1638         msg.msg_flags = 0;
1639
1640         n = recvmsg(b->num, &msg, MSG_PEEK);
1641         if (n <= 0)
1642                 {
1643                 if ((n < 0) && (get_last_socket_error() != EAGAIN) && (get_last_socket_error() != EWOULDBLOCK))
1644                         return -1;
1645                 else
1646                         return 0;
1647                 }
1648
1649         /* if we find a notification, process it and try again if necessary */
1650         while (msg.msg_flags & MSG_NOTIFICATION)
1651                 {
1652                 memset(&snp, 0x00, sizeof(union sctp_notification));
1653                 iov.iov_base = (char *)&snp;
1654                 iov.iov_len = sizeof(union sctp_notification);
1655                 msg.msg_name = NULL;
1656                 msg.msg_namelen = 0;
1657                 msg.msg_iov = &iov;
1658                 msg.msg_iovlen = 1;
1659                 msg.msg_control = NULL;
1660                 msg.msg_controllen = 0;
1661                 msg.msg_flags = 0;
1662
1663                 n = recvmsg(b->num, &msg, 0);
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                 if (snp.sn_header.sn_type == SCTP_SENDER_DRY_EVENT)
1673                         {
1674                         is_dry = 1;
1675
1676                         /* disable sender dry event */
1677 #ifdef SCTP_EVENT
1678                         memset(&event, 0, sizeof(struct sctp_event));
1679                         event.se_assoc_id = 0;
1680                         event.se_type = SCTP_SENDER_DRY_EVENT;
1681                         event.se_on = 0;
1682                         ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENT, &event, sizeof(struct sctp_event));
1683 #else
1684                         eventsize = (socklen_t) sizeof(struct sctp_event_subscribe);
1685                         ret = getsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event, &eventsize);
1686                         if (ret < 0)
1687                                 return -1;
1688
1689                         event.sctp_sender_dry_event = 0;
1690
1691                         ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event, sizeof(struct sctp_event_subscribe));
1692 #endif
1693                         if (ret < 0)
1694                                 return -1;
1695                         }
1696
1697 #ifdef SCTP_AUTHENTICATION_EVENT
1698                 if (snp.sn_header.sn_type == SCTP_AUTHENTICATION_EVENT)
1699                         dgram_sctp_handle_auth_free_key_event(b, &snp);
1700 #endif
1701
1702                 if (data->handle_notifications != NULL)
1703                         data->handle_notifications(b, data->notification_context, (void*) &snp);
1704
1705                 /* found notification, peek again */
1706                 memset(&snp, 0x00, sizeof(union sctp_notification));
1707                 iov.iov_base = (char *)&snp;
1708                 iov.iov_len = sizeof(union sctp_notification);
1709                 msg.msg_name = NULL;
1710                 msg.msg_namelen = 0;
1711                 msg.msg_iov = &iov;
1712                 msg.msg_iovlen = 1;
1713                 msg.msg_control = NULL;
1714                 msg.msg_controllen = 0;
1715                 msg.msg_flags = 0;
1716
1717                 /* if we have seen the dry already, don't wait */
1718                 if (is_dry)
1719                         {
1720                         sockflags = fcntl(b->num, F_GETFL, 0);
1721                         fcntl(b->num, F_SETFL, O_NONBLOCK);
1722                         }
1723
1724                 n = recvmsg(b->num, &msg, MSG_PEEK);
1725
1726                 if (is_dry)
1727                         {
1728                         fcntl(b->num, F_SETFL, sockflags);
1729                         }
1730
1731                 if (n <= 0)
1732                         {
1733                         if ((n < 0) && (get_last_socket_error() != EAGAIN) && (get_last_socket_error() != EWOULDBLOCK))
1734                                 return -1;
1735                         else
1736                                 return is_dry;
1737                         }
1738                 }
1739
1740         /* read anything else */
1741         return is_dry;
1742 }
1743
1744 int BIO_dgram_sctp_msg_waiting(BIO *b)
1745         {
1746         int n, sockflags;
1747         union sctp_notification snp;
1748         struct msghdr msg;
1749         struct iovec iov;
1750         bio_dgram_sctp_data *data = (bio_dgram_sctp_data *)b->ptr;
1751
1752         /* Check if there are any messages waiting to be read */
1753         do
1754                 {
1755                 memset(&snp, 0x00, sizeof(union sctp_notification));
1756                 iov.iov_base = (char *)&snp;
1757                 iov.iov_len = sizeof(union sctp_notification);
1758                 msg.msg_name = NULL;
1759                 msg.msg_namelen = 0;
1760                 msg.msg_iov = &iov;
1761                 msg.msg_iovlen = 1;
1762                 msg.msg_control = NULL;
1763                 msg.msg_controllen = 0;
1764                 msg.msg_flags = 0;
1765
1766                 sockflags = fcntl(b->num, F_GETFL, 0);
1767                 fcntl(b->num, F_SETFL, O_NONBLOCK);
1768                 n = recvmsg(b->num, &msg, MSG_PEEK);
1769                 fcntl(b->num, F_SETFL, sockflags);
1770
1771                 /* if notification, process and try again */
1772                 if (n > 0 && (msg.msg_flags & MSG_NOTIFICATION))
1773                         {
1774 #ifdef SCTP_AUTHENTICATION_EVENT
1775                         if (snp.sn_header.sn_type == SCTP_AUTHENTICATION_EVENT)
1776                                 dgram_sctp_handle_auth_free_key_event(b, &snp);
1777 #endif
1778
1779                         memset(&snp, 0x00, sizeof(union sctp_notification));
1780                         iov.iov_base = (char *)&snp;
1781                         iov.iov_len = sizeof(union sctp_notification);
1782                         msg.msg_name = NULL;
1783                         msg.msg_namelen = 0;
1784                         msg.msg_iov = &iov;
1785                         msg.msg_iovlen = 1;
1786                         msg.msg_control = NULL;
1787                         msg.msg_controllen = 0;
1788                         msg.msg_flags = 0;
1789                         n = recvmsg(b->num, &msg, 0);
1790
1791                         if (data->handle_notifications != NULL)
1792                                 data->handle_notifications(b, data->notification_context, (void*) &snp);
1793                         }
1794
1795                 } while (n > 0 && (msg.msg_flags & MSG_NOTIFICATION));
1796
1797         /* Return 1 if there is a message to be read, return 0 otherwise. */
1798         if (n > 0)
1799                 return 1;
1800         else
1801                 return 0;
1802         }
1803
1804 static int dgram_sctp_puts(BIO *bp, const char *str)
1805         {
1806         int n,ret;
1807
1808         n=strlen(str);
1809         ret=dgram_sctp_write(bp,str,n);
1810         return(ret);
1811         }
1812 #endif
1813
1814 static int BIO_dgram_should_retry(int i)
1815         {
1816         int err;
1817
1818         if ((i == 0) || (i == -1))
1819                 {
1820                 err=get_last_socket_error();
1821
1822 #if defined(OPENSSL_SYS_WINDOWS)
1823         /* If the socket return value (i) is -1
1824          * and err is unexpectedly 0 at this point,
1825          * the error code was overwritten by
1826          * another system call before this error
1827          * handling is called.
1828          */
1829 #endif
1830
1831                 return(BIO_dgram_non_fatal_error(err));
1832                 }
1833         return(0);
1834         }
1835
1836 int BIO_dgram_non_fatal_error(int err)
1837         {
1838         switch (err)
1839                 {
1840 #if defined(OPENSSL_SYS_WINDOWS)
1841 # if defined(WSAEWOULDBLOCK)
1842         case WSAEWOULDBLOCK:
1843 # endif
1844
1845 # if 0 /* This appears to always be an error */
1846 #  if defined(WSAENOTCONN)
1847         case WSAENOTCONN:
1848 #  endif
1849 # endif
1850 #endif
1851
1852 #ifdef EWOULDBLOCK
1853 # ifdef WSAEWOULDBLOCK
1854 #  if WSAEWOULDBLOCK != EWOULDBLOCK
1855         case EWOULDBLOCK:
1856 #  endif
1857 # else
1858         case EWOULDBLOCK:
1859 # endif
1860 #endif
1861
1862 #ifdef EINTR
1863         case EINTR:
1864 #endif
1865
1866 #ifdef EAGAIN
1867 #if EWOULDBLOCK != EAGAIN
1868         case EAGAIN:
1869 # endif
1870 #endif
1871
1872 #ifdef EPROTO
1873         case EPROTO:
1874 #endif
1875
1876 #ifdef EINPROGRESS
1877         case EINPROGRESS:
1878 #endif
1879
1880 #ifdef EALREADY
1881         case EALREADY:
1882 #endif
1883
1884                 return(1);
1885                 /* break; */
1886         default:
1887                 break;
1888                 }
1889         return(0);
1890         }
1891
1892 static void get_current_time(struct timeval *t)
1893         {
1894 #ifdef OPENSSL_SYS_WIN32
1895         struct _timeb tb;
1896         _ftime(&tb);
1897         t->tv_sec = (long)tb.time;
1898         t->tv_usec = (long)tb.millitm * 1000;
1899 #elif defined(OPENSSL_SYS_VMS)
1900         struct timeb tb;
1901         ftime(&tb);
1902         t->tv_sec = (long)tb.time;
1903         t->tv_usec = (long)tb.millitm * 1000;
1904 #else
1905         gettimeofday(t, NULL);
1906 #endif
1907         }
1908
1909 #endif