crypto/openssl/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 #if defined(OPENSSL_SYS_LINUX) && (defined(IP_MTU_DISCOVER) || defined(IP_MTU))
 464         int sockopt_val = 0;
 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         default:
 851                 ret=0;
 852                 break;
 853                 }
 854         return(ret);
 855         }
 856
 857 static int dgram_puts(BIO *bp, const char *str)
 858         {
 859         int n,ret;
 860
 861         n=strlen(str);
 862         ret=dgram_write(bp,str,n);
 863         return(ret);
 864         }
 865
 866 #ifndef OPENSSL_NO_SCTP
 867 BIO_METHOD *BIO_s_datagram_sctp(void)
 868         {
 869         return(&methods_dgramp_sctp);
 870         }
 871
 872 BIO *BIO_new_dgram_sctp(int fd, int close_flag)
 873         {
 874         BIO *bio;
 875         int ret, optval = 20000;
 876         int auth_data = 0, auth_forward = 0;
 877         unsigned char *p;
 878         struct sctp_authchunk auth;
 879         struct sctp_authchunks *authchunks;
 880         socklen_t sockopt_len;
 881 #ifdef SCTP_AUTHENTICATION_EVENT
 882 #ifdef SCTP_EVENT
 883         struct sctp_event event;
 884 #else
 885         struct sctp_event_subscribe event;
 886 #endif
 887 #endif
 888
 889         bio=BIO_new(BIO_s_datagram_sctp());
 890         if (bio == NULL) return(NULL);
 891         BIO_set_fd(bio,fd,close_flag);
 892
 893         /* Activate SCTP-AUTH for DATA and FORWARD-TSN chunks */
 894         auth.sauth_chunk = OPENSSL_SCTP_DATA_CHUNK_TYPE;
 895         ret = setsockopt(fd, IPPROTO_SCTP, SCTP_AUTH_CHUNK, &auth, sizeof(struct sctp_authchunk));
 896         OPENSSL_assert(ret >= 0);
 897         auth.sauth_chunk = OPENSSL_SCTP_FORWARD_CUM_TSN_CHUNK_TYPE;
 898         ret = setsockopt(fd, IPPROTO_SCTP, SCTP_AUTH_CHUNK, &auth, sizeof(struct sctp_authchunk));
 899         OPENSSL_assert(ret >= 0);
 900
 901         /* Test if activation was successful. When using accept(),
 902          * SCTP-AUTH has to be activated for the listening socket
 903          * already, otherwise the connected socket won't use it. */
 904         sockopt_len = (socklen_t)(sizeof(sctp_assoc_t) + 256 * sizeof(uint8_t));
 905         authchunks = OPENSSL_malloc(sockopt_len);
 906         memset(authchunks, 0, sizeof(sockopt_len));
 907         ret = getsockopt(fd, IPPROTO_SCTP, SCTP_LOCAL_AUTH_CHUNKS, authchunks, &sockopt_len);
 908         OPENSSL_assert(ret >= 0);
 909
 910         for (p = (unsigned char*) authchunks->gauth_chunks;
 911              p < (unsigned char*) authchunks + sockopt_len;
 912              p += sizeof(uint8_t))
 913                 {
 914                 if (*p == OPENSSL_SCTP_DATA_CHUNK_TYPE) auth_data = 1;
 915                 if (*p == OPENSSL_SCTP_FORWARD_CUM_TSN_CHUNK_TYPE) auth_forward = 1;
 916                 }
 917
 918         OPENSSL_free(authchunks);
 919
 920         OPENSSL_assert(auth_data);
 921         OPENSSL_assert(auth_forward);
 922
 923 #ifdef SCTP_AUTHENTICATION_EVENT
 924 #ifdef SCTP_EVENT
 925         memset(&event, 0, sizeof(struct sctp_event));
 926         event.se_assoc_id = 0;
 927         event.se_type = SCTP_AUTHENTICATION_EVENT;
 928         event.se_on = 1;
 929         ret = setsockopt(fd, IPPROTO_SCTP, SCTP_EVENT, &event, sizeof(struct sctp_event));
 930         OPENSSL_assert(ret >= 0);
 931 #else
 932         sockopt_len = (socklen_t) sizeof(struct sctp_event_subscribe);
 933         ret = getsockopt(fd, IPPROTO_SCTP, SCTP_EVENTS, &event, &sockopt_len);
 934         OPENSSL_assert(ret >= 0);
 935
 936         event.sctp_authentication_event = 1;
 937
 938         ret = setsockopt(fd, IPPROTO_SCTP, SCTP_EVENTS, &event, sizeof(struct sctp_event_subscribe));
 939         OPENSSL_assert(ret >= 0);
 940 #endif
 941 #endif
 942
 943         /* Disable partial delivery by setting the min size
 944          * larger than the max record size of 2^14 + 2048 + 13
 945          */
 946         ret = setsockopt(fd, IPPROTO_SCTP, SCTP_PARTIAL_DELIVERY_POINT, &optval, sizeof(optval));
 947         OPENSSL_assert(ret >= 0);
 948
 949         return(bio);
 950         }
 951
 952 int BIO_dgram_is_sctp(BIO *bio)
 953         {
 954         return (BIO_method_type(bio) == BIO_TYPE_DGRAM_SCTP);
 955         }
 956
 957 static int dgram_sctp_new(BIO *bi)
 958         {
 959         bio_dgram_sctp_data *data = NULL;
 960
 961         bi->init=0;
 962         bi->num=0;
 963         data = OPENSSL_malloc(sizeof(bio_dgram_sctp_data));
 964         if (data == NULL)
 965                 return 0;
 966         memset(data, 0x00, sizeof(bio_dgram_sctp_data));
 967 #ifdef SCTP_PR_SCTP_NONE
 968         data->prinfo.pr_policy = SCTP_PR_SCTP_NONE;
 969 #endif
 970     bi->ptr = data;
 971
 972         bi->flags=0;
 973         return(1);
 974         }
 975
 976 static int dgram_sctp_free(BIO *a)
 977         {
 978         bio_dgram_sctp_data *data;
 979
 980         if (a == NULL) return(0);
 981         if ( ! dgram_clear(a))
 982                 return 0;
 983
 984         data = (bio_dgram_sctp_data *)a->ptr;
 985         if(data != NULL)
 986                 {
 987                 if(data->saved_message.data != NULL)
 988                         OPENSSL_free(data->saved_message.data);
 989                 OPENSSL_free(data);
 990                 }
 991
 992         return(1);
 993         }
 994
 995 #ifdef SCTP_AUTHENTICATION_EVENT
 996 void dgram_sctp_handle_auth_free_key_event(BIO *b, union sctp_notification *snp)
 997         {
 998         int ret;
 999         struct sctp_authkey_event* authkeyevent = &snp->sn_auth_event;
1000
1001         if (authkeyevent->auth_indication == SCTP_AUTH_FREE_KEY)
1002                 {
1003                 struct sctp_authkeyid authkeyid;
1004
1005                 /* delete key */
1006                 authkeyid.scact_keynumber = authkeyevent->auth_keynumber;
1007                 ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_DELETE_KEY,
1008                       &authkeyid, sizeof(struct sctp_authkeyid));
1009                 }
1010         }
1011 #endif
1012
1013 static int dgram_sctp_read(BIO *b, char *out, int outl)
1014         {
1015         int ret = 0, n = 0, i, optval;
1016         socklen_t optlen;
1017         bio_dgram_sctp_data *data = (bio_dgram_sctp_data *)b->ptr;
1018         union sctp_notification *snp;
1019         struct msghdr msg;
1020         struct iovec iov;
1021         struct cmsghdr *cmsg;
1022         char cmsgbuf[512];
1023
1024         if (out != NULL)
1025                 {
1026                 clear_socket_error();
1027
1028                 do
1029                         {
1030                         memset(&data->rcvinfo, 0x00, sizeof(struct bio_dgram_sctp_rcvinfo));
1031                         iov.iov_base = out;
1032                         iov.iov_len = outl;
1033                         msg.msg_name = NULL;
1034                         msg.msg_namelen = 0;
1035                         msg.msg_iov = &iov;
1036                         msg.msg_iovlen = 1;
1037                         msg.msg_control = cmsgbuf;
1038                         msg.msg_controllen = 512;
1039                         msg.msg_flags = 0;
1040                         n = recvmsg(b->num, &msg, 0);
1041
1042                         if (msg.msg_controllen > 0)
1043                                 {
1044                                 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg))
1045                                         {
1046                                         if (cmsg->cmsg_level != IPPROTO_SCTP)
1047                                                 continue;
1048 #ifdef SCTP_RCVINFO
1049                                         if (cmsg->cmsg_type == SCTP_RCVINFO)
1050                                                 {
1051                                                 struct sctp_rcvinfo *rcvinfo;
1052
1053                                                 rcvinfo = (struct sctp_rcvinfo *)CMSG_DATA(cmsg);
1054                                                 data->rcvinfo.rcv_sid = rcvinfo->rcv_sid;
1055                                                 data->rcvinfo.rcv_ssn = rcvinfo->rcv_ssn;
1056                                                 data->rcvinfo.rcv_flags = rcvinfo->rcv_flags;
1057                                                 data->rcvinfo.rcv_ppid = rcvinfo->rcv_ppid;
1058                                                 data->rcvinfo.rcv_tsn = rcvinfo->rcv_tsn;
1059                                                 data->rcvinfo.rcv_cumtsn = rcvinfo->rcv_cumtsn;
1060                                                 data->rcvinfo.rcv_context = rcvinfo->rcv_context;
1061                                                 }
1062 #endif
1063 #ifdef SCTP_SNDRCV
1064                                         if (cmsg->cmsg_type == SCTP_SNDRCV)
1065                                                 {
1066                                                 struct sctp_sndrcvinfo *sndrcvinfo;
1067
1068                                                 sndrcvinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
1069                                                 data->rcvinfo.rcv_sid = sndrcvinfo->sinfo_stream;
1070                                                 data->rcvinfo.rcv_ssn = sndrcvinfo->sinfo_ssn;
1071                                                 data->rcvinfo.rcv_flags = sndrcvinfo->sinfo_flags;
1072                                                 data->rcvinfo.rcv_ppid = sndrcvinfo->sinfo_ppid;
1073                                                 data->rcvinfo.rcv_tsn = sndrcvinfo->sinfo_tsn;
1074                                                 data->rcvinfo.rcv_cumtsn = sndrcvinfo->sinfo_cumtsn;
1075                                                 data->rcvinfo.rcv_context = sndrcvinfo->sinfo_context;
1076                                                 }
1077 #endif
1078                                         }
1079                                 }
1080
1081                         if (n <= 0)
1082                                 {
1083                                 if (n < 0)
1084                                         ret = n;
1085                                 break;
1086                                 }
1087
1088                         if (msg.msg_flags & MSG_NOTIFICATION)
1089                                 {
1090                                 snp = (union sctp_notification*) out;
1091                                 if (snp->sn_header.sn_type == SCTP_SENDER_DRY_EVENT)
1092                                         {
1093 #ifdef SCTP_EVENT
1094                                         struct sctp_event event;
1095 #else
1096                                         struct sctp_event_subscribe event;
1097                                         socklen_t eventsize;
1098 #endif
1099                                         /* If a message has been delayed until the socket
1100                                          * is dry, it can be sent now.
1101                                          */
1102                                         if (data->saved_message.length > 0)
1103                                                 {
1104                                                 dgram_sctp_write(data->saved_message.bio, data->saved_message.data,
1105                                                                  data->saved_message.length);
1106                                                 OPENSSL_free(data->saved_message.data);
1107                                                 data->saved_message.data = NULL;
1108                                                 data->saved_message.length = 0;
1109                                                 }
1110
1111                                         /* disable sender dry event */
1112 #ifdef SCTP_EVENT
1113                                         memset(&event, 0, sizeof(struct sctp_event));
1114                                         event.se_assoc_id = 0;
1115                                         event.se_type = SCTP_SENDER_DRY_EVENT;
1116                                         event.se_on = 0;
1117                                         i = setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENT, &event, sizeof(struct sctp_event));
1118                                         OPENSSL_assert(i >= 0);
1119 #else
1120                                         eventsize = sizeof(struct sctp_event_subscribe);
1121                                         i = getsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event, &eventsize);
1122                                         OPENSSL_assert(i >= 0);
1123
1124                                         event.sctp_sender_dry_event = 0;
1125
1126                                         i = setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event, sizeof(struct sctp_event_subscribe));
1127                                         OPENSSL_assert(i >= 0);
1128 #endif
1129                                         }
1130
1131 #ifdef SCTP_AUTHENTICATION_EVENT
1132                                 if (snp->sn_header.sn_type == SCTP_AUTHENTICATION_EVENT)
1133                                         dgram_sctp_handle_auth_free_key_event(b, snp);
1134 #endif
1135
1136                                 if (data->handle_notifications != NULL)
1137                                         data->handle_notifications(b, data->notification_context, (void*) out);
1138
1139                                 memset(out, 0, outl);
1140                                 }
1141                         else
1142                                 ret += n;
1143                         }
1144                 while ((msg.msg_flags & MSG_NOTIFICATION) && (msg.msg_flags & MSG_EOR) && (ret < outl));
1145
1146                 if (ret > 0 && !(msg.msg_flags & MSG_EOR))
1147                         {
1148                         /* Partial message read, this should never happen! */
1149
1150                         /* The buffer was too small, this means the peer sent
1151                          * a message that was larger than allowed. */
1152                         if (ret == outl)
1153                                 return -1;
1154
1155                         /* Test if socket buffer can handle max record
1156                          * size (2^14 + 2048 + 13)
1157                          */
1158                         optlen = (socklen_t) sizeof(int);
1159                         ret = getsockopt(b->num, SOL_SOCKET, SO_RCVBUF, &optval, &optlen);
1160                         OPENSSL_assert(ret >= 0);
1161                         OPENSSL_assert(optval >= 18445);
1162
1163                         /* Test if SCTP doesn't partially deliver below
1164                          * max record size (2^14 + 2048 + 13)
1165                          */
1166                         optlen = (socklen_t) sizeof(int);
1167                         ret = getsockopt(b->num, IPPROTO_SCTP, SCTP_PARTIAL_DELIVERY_POINT,
1168                                          &optval, &optlen);
1169                         OPENSSL_assert(ret >= 0);
1170                         OPENSSL_assert(optval >= 18445);
1171
1172                         /* Partially delivered notification??? Probably a bug.... */
1173                         OPENSSL_assert(!(msg.msg_flags & MSG_NOTIFICATION));
1174
1175                         /* Everything seems ok till now, so it's most likely
1176                          * a message dropped by PR-SCTP.
1177                          */
1178                         memset(out, 0, outl);
1179                         BIO_set_retry_read(b);
1180                         return -1;
1181                         }
1182
1183                 BIO_clear_retry_flags(b);
1184                 if (ret < 0)
1185                         {
1186                         if (BIO_dgram_should_retry(ret))
1187                                 {
1188                                 BIO_set_retry_read(b);
1189                                 data->_errno = get_last_socket_error();
1190                                 }
1191                         }
1192
1193                 /* Test if peer uses SCTP-AUTH before continuing */
1194                 if (!data->peer_auth_tested)
1195                         {
1196                         int ii, auth_data = 0, auth_forward = 0;
1197                         unsigned char *p;
1198                         struct sctp_authchunks *authchunks;
1199
1200                         optlen = (socklen_t)(sizeof(sctp_assoc_t) + 256 * sizeof(uint8_t));
1201                         authchunks = OPENSSL_malloc(optlen);
1202                         memset(authchunks, 0, sizeof(optlen));
1203                         ii = getsockopt(b->num, IPPROTO_SCTP, SCTP_PEER_AUTH_CHUNKS, authchunks, &optlen);
1204                         OPENSSL_assert(ii >= 0);
1205
1206                         for (p = (unsigned char*) authchunks->gauth_chunks;
1207                                  p < (unsigned char*) authchunks + optlen;
1208                                  p += sizeof(uint8_t))
1209                                 {
1210                                 if (*p == OPENSSL_SCTP_DATA_CHUNK_TYPE) auth_data = 1;
1211                                 if (*p == OPENSSL_SCTP_FORWARD_CUM_TSN_CHUNK_TYPE) auth_forward = 1;
1212                                 }
1213
1214                         OPENSSL_free(authchunks);
1215
1216                         if (!auth_data || !auth_forward)
1217                                 {
1218                                 BIOerr(BIO_F_DGRAM_SCTP_READ,BIO_R_CONNECT_ERROR);
1219                                 return -1;
1220                                 }
1221
1222                         data->peer_auth_tested = 1;
1223                         }
1224                 }
1225         return(ret);
1226         }
1227
1228 static int dgram_sctp_write(BIO *b, const char *in, int inl)
1229         {
1230         int ret;
1231         bio_dgram_sctp_data *data = (bio_dgram_sctp_data *)b->ptr;
1232         struct bio_dgram_sctp_sndinfo *sinfo = &(data->sndinfo);
1233         struct bio_dgram_sctp_prinfo *pinfo = &(data->prinfo);
1234         struct bio_dgram_sctp_sndinfo handshake_sinfo;
1235         struct iovec iov[1];
1236         struct msghdr msg;
1237         struct cmsghdr *cmsg;
1238 #if defined(SCTP_SNDINFO) && defined(SCTP_PRINFO)
1239         char cmsgbuf[CMSG_SPACE(sizeof(struct sctp_sndinfo)) + CMSG_SPACE(sizeof(struct sctp_prinfo))];
1240         struct sctp_sndinfo *sndinfo;
1241         struct sctp_prinfo *prinfo;
1242 #else
1243         char cmsgbuf[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))];
1244         struct sctp_sndrcvinfo *sndrcvinfo;
1245 #endif
1246
1247         clear_socket_error();
1248
1249         /* If we're send anything else than application data,
1250          * disable all user parameters and flags.
1251          */
1252         if (in[0] != 23) {
1253                 memset(&handshake_sinfo, 0x00, sizeof(struct bio_dgram_sctp_sndinfo));
1254 #ifdef SCTP_SACK_IMMEDIATELY
1255                 handshake_sinfo.snd_flags = SCTP_SACK_IMMEDIATELY;
1256 #endif
1257                 sinfo = &handshake_sinfo;
1258         }
1259
1260         /* If we have to send a shutdown alert message and the
1261          * socket is not dry yet, we have to save it and send it
1262          * as soon as the socket gets dry.
1263          */
1264         if (data->save_shutdown && !BIO_dgram_sctp_wait_for_dry(b))
1265         {
1266                 data->saved_message.bio = b;
1267                 if (data->saved_message.data)
1268                         OPENSSL_free(data->saved_message.data);
1269                 data->saved_message.data = OPENSSL_malloc(inl);
1270                 memcpy(data->saved_message.data, in, inl);
1271                 data->saved_message.length = inl;
1272                 return inl;
1273         }
1274
1275         iov[0].iov_base = (char *)in;
1276         iov[0].iov_len = inl;
1277         msg.msg_name = NULL;
1278         msg.msg_namelen = 0;
1279         msg.msg_iov = iov;
1280         msg.msg_iovlen = 1;
1281         msg.msg_control = (caddr_t)cmsgbuf;
1282         msg.msg_controllen = 0;
1283         msg.msg_flags = 0;
1284 #if defined(SCTP_SNDINFO) && defined(SCTP_PRINFO)
1285         cmsg = (struct cmsghdr *)cmsgbuf;
1286         cmsg->cmsg_level = IPPROTO_SCTP;
1287         cmsg->cmsg_type = SCTP_SNDINFO;
1288         cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndinfo));
1289         sndinfo = (struct sctp_sndinfo *)CMSG_DATA(cmsg);
1290         memset(sndinfo, 0, sizeof(struct sctp_sndinfo));
1291         sndinfo->snd_sid = sinfo->snd_sid;
1292         sndinfo->snd_flags = sinfo->snd_flags;
1293         sndinfo->snd_ppid = sinfo->snd_ppid;
1294         sndinfo->snd_context = sinfo->snd_context;
1295         msg.msg_controllen += CMSG_SPACE(sizeof(struct sctp_sndinfo));
1296
1297         cmsg = (struct cmsghdr *)&cmsgbuf[CMSG_SPACE(sizeof(struct sctp_sndinfo))];
1298         cmsg->cmsg_level = IPPROTO_SCTP;
1299         cmsg->cmsg_type = SCTP_PRINFO;
1300         cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_prinfo));
1301         prinfo = (struct sctp_prinfo *)CMSG_DATA(cmsg);
1302         memset(prinfo, 0, sizeof(struct sctp_prinfo));
1303         prinfo->pr_policy = pinfo->pr_policy;
1304         prinfo->pr_value = pinfo->pr_value;
1305         msg.msg_controllen += CMSG_SPACE(sizeof(struct sctp_prinfo));
1306 #else
1307         cmsg = (struct cmsghdr *)cmsgbuf;
1308         cmsg->cmsg_level = IPPROTO_SCTP;
1309         cmsg->cmsg_type = SCTP_SNDRCV;
1310         cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo));
1311         sndrcvinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
1312         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
1313         sndrcvinfo->sinfo_stream = sinfo->snd_sid;
1314         sndrcvinfo->sinfo_flags = sinfo->snd_flags;
1315 #ifdef __FreeBSD__
1316         sndrcvinfo->sinfo_flags |= pinfo->pr_policy;
1317 #endif
1318         sndrcvinfo->sinfo_ppid = sinfo->snd_ppid;
1319         sndrcvinfo->sinfo_context = sinfo->snd_context;
1320         sndrcvinfo->sinfo_timetolive = pinfo->pr_value;
1321         msg.msg_controllen += CMSG_SPACE(sizeof(struct sctp_sndrcvinfo));
1322 #endif
1323
1324         ret = sendmsg(b->num, &msg, 0);
1325
1326         BIO_clear_retry_flags(b);
1327         if (ret <= 0)
1328                 {
1329                 if (BIO_dgram_should_retry(ret))
1330                         {
1331                         BIO_set_retry_write(b);
1332                         data->_errno = get_last_socket_error();
1333                         }
1334                 }
1335         return(ret);
1336         }
1337
1338 static long dgram_sctp_ctrl(BIO *b, int cmd, long num, void *ptr)
1339         {
1340         long ret=1;
1341         bio_dgram_sctp_data *data = NULL;
1342         socklen_t sockopt_len = 0;
1343         struct sctp_authkeyid authkeyid;
1344         struct sctp_authkey *authkey = NULL;
1345
1346         data = (bio_dgram_sctp_data *)b->ptr;
1347
1348         switch (cmd)
1349                 {
1350         case BIO_CTRL_DGRAM_QUERY_MTU:
1351                 /* Set to maximum (2^14)
1352                  * and ignore user input to enable transport
1353                  * protocol fragmentation.
1354                  * Returns always 2^14.
1355                  */
1356                 data->mtu = 16384;
1357                 ret = data->mtu;
1358                 break;
1359         case BIO_CTRL_DGRAM_SET_MTU:
1360                 /* Set to maximum (2^14)
1361                  * and ignore input to enable transport
1362                  * protocol fragmentation.
1363                  * Returns always 2^14.
1364                  */
1365                 data->mtu = 16384;
1366                 ret = data->mtu;
1367                 break;
1368         case BIO_CTRL_DGRAM_SET_CONNECTED:
1369         case BIO_CTRL_DGRAM_CONNECT:
1370                 /* Returns always -1. */
1371                 ret = -1;
1372                 break;
1373         case BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT:
1374                 /* SCTP doesn't need the DTLS timer
1375                  * Returns always 1.
1376                  */
1377                 break;
1378         case BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE:
1379                 if (num > 0)
1380                         data->in_handshake = 1;
1381                 else
1382                         data->in_handshake = 0;
1383
1384                 ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_NODELAY, &data->in_handshake, sizeof(int));
1385                 break;
1386         case BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY:
1387                 /* New shared key for SCTP AUTH.
1388                  * Returns 0 on success, -1 otherwise.
1389                  */
1390
1391                 /* Get active key */
1392                 sockopt_len = sizeof(struct sctp_authkeyid);
1393                 ret = getsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY, &authkeyid, &sockopt_len);
1394                 if (ret < 0) break;
1395
1396                 /* Add new key */
1397                 sockopt_len = sizeof(struct sctp_authkey) + 64 * sizeof(uint8_t);
1398                 authkey = OPENSSL_malloc(sockopt_len);
1399                 if (authkey == NULL)
1400                         {
1401                         ret = -1;
1402                         break;
1403                         }
1404                 memset(authkey, 0x00, sockopt_len);
1405                 authkey->sca_keynumber = authkeyid.scact_keynumber + 1;
1406 #ifndef __FreeBSD__
1407                 /* This field is missing in FreeBSD 8.2 and earlier,
1408                  * and FreeBSD 8.3 and higher work without it.
1409                  */
1410                 authkey->sca_keylength = 64;
1411 #endif
1412                 memcpy(&authkey->sca_key[0], ptr, 64 * sizeof(uint8_t));
1413
1414                 ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_KEY, authkey, sockopt_len);
1415                 OPENSSL_free(authkey);
1416                 authkey = NULL;
1417                 if (ret < 0) break;
1418
1419                 /* Reset active key */
1420                 ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY,
1421                       &authkeyid, sizeof(struct sctp_authkeyid));
1422                 if (ret < 0) break;
1423
1424                 break;
1425         case BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY:
1426                 /* Returns 0 on success, -1 otherwise. */
1427
1428                 /* Get active key */
1429                 sockopt_len = sizeof(struct sctp_authkeyid);
1430                 ret = getsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY, &authkeyid, &sockopt_len);
1431                 if (ret < 0) break;
1432
1433                 /* Set active key */
1434                 authkeyid.scact_keynumber = authkeyid.scact_keynumber + 1;
1435                 ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY,
1436                       &authkeyid, sizeof(struct sctp_authkeyid));
1437                 if (ret < 0) break;
1438
1439                 /* CCS has been sent, so remember that and fall through
1440                  * to check if we need to deactivate an old key
1441                  */
1442                 data->ccs_sent = 1;
1443
1444         case BIO_CTRL_DGRAM_SCTP_AUTH_CCS_RCVD:
1445                 /* Returns 0 on success, -1 otherwise. */
1446
1447                 /* Has this command really been called or is this just a fall-through? */
1448                 if (cmd == BIO_CTRL_DGRAM_SCTP_AUTH_CCS_RCVD)
1449                         data->ccs_rcvd = 1;
1450
1451                 /* CSS has been both, received and sent, so deactivate an old key */
1452                 if (data->ccs_rcvd == 1 && data->ccs_sent == 1)
1453                         {
1454                         /* Get active key */
1455                         sockopt_len = sizeof(struct sctp_authkeyid);
1456                         ret = getsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY, &authkeyid, &sockopt_len);
1457                         if (ret < 0) break;
1458
1459                         /* Deactivate key or delete second last key if
1460                          * SCTP_AUTHENTICATION_EVENT is not available.
1461                          */
1462                         authkeyid.scact_keynumber = authkeyid.scact_keynumber - 1;
1463 #ifdef SCTP_AUTH_DEACTIVATE_KEY
1464                         sockopt_len = sizeof(struct sctp_authkeyid);
1465                         ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_DEACTIVATE_KEY,
1466                               &authkeyid, sockopt_len);
1467                         if (ret < 0) break;
1468 #endif
1469 #ifndef SCTP_AUTHENTICATION_EVENT
1470                         if (authkeyid.scact_keynumber > 0)
1471                                 {
1472                                 authkeyid.scact_keynumber = authkeyid.scact_keynumber - 1;
1473                                 ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_DELETE_KEY,
1474                                           &authkeyid, sizeof(struct sctp_authkeyid));
1475                                 if (ret < 0) break;
1476                                 }
1477 #endif
1478
1479                         data->ccs_rcvd = 0;
1480                         data->ccs_sent = 0;
1481                         }
1482                 break;
1483         case BIO_CTRL_DGRAM_SCTP_GET_SNDINFO:
1484                 /* Returns the size of the copied struct. */
1485                 if (num > (long) sizeof(struct bio_dgram_sctp_sndinfo))
1486                         num = sizeof(struct bio_dgram_sctp_sndinfo);
1487
1488                 memcpy(ptr, &(data->sndinfo), num);
1489                 ret = num;
1490                 break;
1491         case BIO_CTRL_DGRAM_SCTP_SET_SNDINFO:
1492                 /* Returns the size of the copied struct. */
1493                 if (num > (long) sizeof(struct bio_dgram_sctp_sndinfo))
1494                         num = sizeof(struct bio_dgram_sctp_sndinfo);
1495
1496                 memcpy(&(data->sndinfo), ptr, num);
1497                 break;
1498         case BIO_CTRL_DGRAM_SCTP_GET_RCVINFO:
1499                 /* Returns the size of the copied struct. */
1500                 if (num > (long) sizeof(struct bio_dgram_sctp_rcvinfo))
1501                         num = sizeof(struct bio_dgram_sctp_rcvinfo);
1502
1503                 memcpy(ptr, &data->rcvinfo, num);
1504
1505                 ret = num;
1506                 break;
1507         case BIO_CTRL_DGRAM_SCTP_SET_RCVINFO:
1508                 /* Returns the size of the copied struct. */
1509                 if (num > (long) sizeof(struct bio_dgram_sctp_rcvinfo))
1510                         num = sizeof(struct bio_dgram_sctp_rcvinfo);
1511
1512                 memcpy(&(data->rcvinfo), ptr, num);
1513                 break;
1514         case BIO_CTRL_DGRAM_SCTP_GET_PRINFO:
1515                 /* Returns the size of the copied struct. */
1516                 if (num > (long) sizeof(struct bio_dgram_sctp_prinfo))
1517                         num = sizeof(struct bio_dgram_sctp_prinfo);
1518
1519                 memcpy(ptr, &(data->prinfo), num);
1520                 ret = num;
1521                 break;
1522         case BIO_CTRL_DGRAM_SCTP_SET_PRINFO:
1523                 /* Returns the size of the copied struct. */
1524                 if (num > (long) sizeof(struct bio_dgram_sctp_prinfo))
1525                         num = sizeof(struct bio_dgram_sctp_prinfo);
1526
1527                 memcpy(&(data->prinfo), ptr, num);
1528                 break;
1529         case BIO_CTRL_DGRAM_SCTP_SAVE_SHUTDOWN:
1530                 /* Returns always 1. */
1531                 if (num > 0)
1532                         data->save_shutdown = 1;
1533                 else
1534                         data->save_shutdown = 0;
1535                 break;
1536
1537         default:
1538                 /* Pass to default ctrl function to
1539                  * process SCTP unspecific commands
1540                  */
1541                 ret=dgram_ctrl(b, cmd, num, ptr);
1542                 break;
1543                 }
1544         return(ret);
1545         }
1546
1547 int BIO_dgram_sctp_notification_cb(BIO *b,
1548                                    void (*handle_notifications)(BIO *bio, void *context, void *buf),
1549                                    void *context)
1550         {
1551         bio_dgram_sctp_data *data = (bio_dgram_sctp_data *) b->ptr;
1552
1553         if (handle_notifications != NULL)
1554                 {
1555                 data->handle_notifications = handle_notifications;
1556                 data->notification_context = context;
1557                 }
1558         else
1559                 return -1;
1560
1561         return 0;
1562         }
1563
1564 int BIO_dgram_sctp_wait_for_dry(BIO *b)
1565 {
1566         int is_dry = 0;
1567         int n, sockflags, ret;
1568         union sctp_notification snp;
1569         struct msghdr msg;
1570         struct iovec iov;
1571 #ifdef SCTP_EVENT
1572         struct sctp_event event;
1573 #else
1574         struct sctp_event_subscribe event;
1575         socklen_t eventsize;
1576 #endif
1577         bio_dgram_sctp_data *data = (bio_dgram_sctp_data *)b->ptr;
1578
1579         /* set sender dry event */
1580 #ifdef SCTP_EVENT
1581         memset(&event, 0, sizeof(struct sctp_event));
1582         event.se_assoc_id = 0;
1583         event.se_type = SCTP_SENDER_DRY_EVENT;
1584         event.se_on = 1;
1585         ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENT, &event, sizeof(struct sctp_event));
1586 #else
1587         eventsize = sizeof(struct sctp_event_subscribe);
1588         ret = getsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event, &eventsize);
1589         if (ret < 0)
1590                 return -1;
1591
1592         event.sctp_sender_dry_event = 1;
1593
1594         ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event, sizeof(struct sctp_event_subscribe));
1595 #endif
1596         if (ret < 0)
1597                 return -1;
1598
1599         /* peek for notification */
1600         memset(&snp, 0x00, sizeof(union sctp_notification));
1601         iov.iov_base = (char *)&snp;
1602         iov.iov_len = sizeof(union sctp_notification);
1603         msg.msg_name = NULL;
1604         msg.msg_namelen = 0;
1605         msg.msg_iov = &iov;
1606         msg.msg_iovlen = 1;
1607         msg.msg_control = NULL;
1608         msg.msg_controllen = 0;
1609         msg.msg_flags = 0;
1610
1611         n = recvmsg(b->num, &msg, MSG_PEEK);
1612         if (n <= 0)
1613                 {
1614                 if ((n < 0) && (get_last_socket_error() != EAGAIN) && (get_last_socket_error() != EWOULDBLOCK))
1615                         return -1;
1616                 else
1617                         return 0;
1618                 }
1619
1620         /* if we find a notification, process it and try again if necessary */
1621         while (msg.msg_flags & MSG_NOTIFICATION)
1622                 {
1623                 memset(&snp, 0x00, sizeof(union sctp_notification));
1624                 iov.iov_base = (char *)&snp;
1625                 iov.iov_len = sizeof(union sctp_notification);
1626                 msg.msg_name = NULL;
1627                 msg.msg_namelen = 0;
1628                 msg.msg_iov = &iov;
1629                 msg.msg_iovlen = 1;
1630                 msg.msg_control = NULL;
1631                 msg.msg_controllen = 0;
1632                 msg.msg_flags = 0;
1633
1634                 n = recvmsg(b->num, &msg, 0);
1635                 if (n <= 0)
1636                         {
1637                         if ((n < 0) && (get_last_socket_error() != EAGAIN) && (get_last_socket_error() != EWOULDBLOCK))
1638                                 return -1;
1639                         else
1640                                 return is_dry;
1641                         }
1642
1643                 if (snp.sn_header.sn_type == SCTP_SENDER_DRY_EVENT)
1644                         {
1645                         is_dry = 1;
1646
1647                         /* disable sender dry event */
1648 #ifdef SCTP_EVENT
1649                         memset(&event, 0, sizeof(struct sctp_event));
1650                         event.se_assoc_id = 0;
1651                         event.se_type = SCTP_SENDER_DRY_EVENT;
1652                         event.se_on = 0;
1653                         ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENT, &event, sizeof(struct sctp_event));
1654 #else
1655                         eventsize = (socklen_t) sizeof(struct sctp_event_subscribe);
1656                         ret = getsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event, &eventsize);
1657                         if (ret < 0)
1658                                 return -1;
1659
1660                         event.sctp_sender_dry_event = 0;
1661
1662                         ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event, sizeof(struct sctp_event_subscribe));
1663 #endif
1664                         if (ret < 0)
1665                                 return -1;
1666                         }
1667
1668 #ifdef SCTP_AUTHENTICATION_EVENT
1669                 if (snp.sn_header.sn_type == SCTP_AUTHENTICATION_EVENT)
1670                         dgram_sctp_handle_auth_free_key_event(b, &snp);
1671 #endif
1672
1673                 if (data->handle_notifications != NULL)
1674                         data->handle_notifications(b, data->notification_context, (void*) &snp);
1675
1676                 /* found notification, peek again */
1677                 memset(&snp, 0x00, sizeof(union sctp_notification));
1678                 iov.iov_base = (char *)&snp;
1679                 iov.iov_len = sizeof(union sctp_notification);
1680                 msg.msg_name = NULL;
1681                 msg.msg_namelen = 0;
1682                 msg.msg_iov = &iov;
1683                 msg.msg_iovlen = 1;
1684                 msg.msg_control = NULL;
1685                 msg.msg_controllen = 0;
1686                 msg.msg_flags = 0;
1687
1688                 /* if we have seen the dry already, don't wait */
1689                 if (is_dry)
1690                         {
1691                         sockflags = fcntl(b->num, F_GETFL, 0);
1692                         fcntl(b->num, F_SETFL, O_NONBLOCK);
1693                         }
1694
1695                 n = recvmsg(b->num, &msg, MSG_PEEK);
1696
1697                 if (is_dry)
1698                         {
1699                         fcntl(b->num, F_SETFL, sockflags);
1700                         }
1701
1702                 if (n <= 0)
1703                         {
1704                         if ((n < 0) && (get_last_socket_error() != EAGAIN) && (get_last_socket_error() != EWOULDBLOCK))
1705                                 return -1;
1706                         else
1707                                 return is_dry;
1708                         }
1709                 }
1710
1711         /* read anything else */
1712         return is_dry;
1713 }
1714
1715 int BIO_dgram_sctp_msg_waiting(BIO *b)
1716         {
1717         int n, sockflags;
1718         union sctp_notification snp;
1719         struct msghdr msg;
1720         struct iovec iov;
1721         bio_dgram_sctp_data *data = (bio_dgram_sctp_data *)b->ptr;
1722
1723         /* Check if there are any messages waiting to be read */
1724         do
1725                 {
1726                 memset(&snp, 0x00, sizeof(union sctp_notification));
1727                 iov.iov_base = (char *)&snp;
1728                 iov.iov_len = sizeof(union sctp_notification);
1729                 msg.msg_name = NULL;
1730                 msg.msg_namelen = 0;
1731                 msg.msg_iov = &iov;
1732                 msg.msg_iovlen = 1;
1733                 msg.msg_control = NULL;
1734                 msg.msg_controllen = 0;
1735                 msg.msg_flags = 0;
1736
1737                 sockflags = fcntl(b->num, F_GETFL, 0);
1738                 fcntl(b->num, F_SETFL, O_NONBLOCK);
1739                 n = recvmsg(b->num, &msg, MSG_PEEK);
1740                 fcntl(b->num, F_SETFL, sockflags);
1741
1742                 /* if notification, process and try again */
1743                 if (n > 0 && (msg.msg_flags & MSG_NOTIFICATION))
1744                         {
1745 #ifdef SCTP_AUTHENTICATION_EVENT
1746                         if (snp.sn_header.sn_type == SCTP_AUTHENTICATION_EVENT)
1747                                 dgram_sctp_handle_auth_free_key_event(b, &snp);
1748 #endif
1749
1750                         memset(&snp, 0x00, sizeof(union sctp_notification));
1751                         iov.iov_base = (char *)&snp;
1752                         iov.iov_len = sizeof(union sctp_notification);
1753                         msg.msg_name = NULL;
1754                         msg.msg_namelen = 0;
1755                         msg.msg_iov = &iov;
1756                         msg.msg_iovlen = 1;
1757                         msg.msg_control = NULL;
1758                         msg.msg_controllen = 0;
1759                         msg.msg_flags = 0;
1760                         n = recvmsg(b->num, &msg, 0);
1761
1762                         if (data->handle_notifications != NULL)
1763                                 data->handle_notifications(b, data->notification_context, (void*) &snp);
1764                         }
1765
1766                 } while (n > 0 && (msg.msg_flags & MSG_NOTIFICATION));
1767
1768         /* Return 1 if there is a message to be read, return 0 otherwise. */
1769         if (n > 0)
1770                 return 1;
1771         else
1772                 return 0;
1773         }
1774
1775 static int dgram_sctp_puts(BIO *bp, const char *str)
1776         {
1777         int n,ret;
1778
1779         n=strlen(str);
1780         ret=dgram_sctp_write(bp,str,n);
1781         return(ret);
1782         }
1783 #endif
1784
1785 static int BIO_dgram_should_retry(int i)
1786         {
1787         int err;
1788
1789         if ((i == 0) || (i == -1))
1790                 {
1791                 err=get_last_socket_error();
1792
1793 #if defined(OPENSSL_SYS_WINDOWS)
1794         /* If the socket return value (i) is -1
1795          * and err is unexpectedly 0 at this point,
1796          * the error code was overwritten by
1797          * another system call before this error
1798          * handling is called.
1799          */
1800 #endif
1801
1802                 return(BIO_dgram_non_fatal_error(err));
1803                 }
1804         return(0);
1805         }
1806
1807 int BIO_dgram_non_fatal_error(int err)
1808         {
1809         switch (err)
1810                 {
1811 #if defined(OPENSSL_SYS_WINDOWS)
1812 # if defined(WSAEWOULDBLOCK)
1813         case WSAEWOULDBLOCK:
1814 # endif
1815
1816 # if 0 /* This appears to always be an error */
1817 #  if defined(WSAENOTCONN)
1818         case WSAENOTCONN:
1819 #  endif
1820 # endif
1821 #endif
1822
1823 #ifdef EWOULDBLOCK
1824 # ifdef WSAEWOULDBLOCK
1825 #  if WSAEWOULDBLOCK != EWOULDBLOCK
1826         case EWOULDBLOCK:
1827 #  endif
1828 # else
1829         case EWOULDBLOCK:
1830 # endif
1831 #endif
1832
1833 #ifdef EINTR
1834         case EINTR:
1835 #endif
1836
1837 #ifdef EAGAIN
1838 #if EWOULDBLOCK != EAGAIN
1839         case EAGAIN:
1840 # endif
1841 #endif
1842
1843 #ifdef EPROTO
1844         case EPROTO:
1845 #endif
1846
1847 #ifdef EINPROGRESS
1848         case EINPROGRESS:
1849 #endif
1850
1851 #ifdef EALREADY
1852         case EALREADY:
1853 #endif
1854
1855                 return(1);
1856                 /* break; */
1857         default:
1858                 break;
1859                 }
1860         return(0);
1861         }
1862
1863 static void get_current_time(struct timeval *t)
1864         {
1865 #ifdef OPENSSL_SYS_WIN32
1866         struct _timeb tb;
1867         _ftime(&tb);
1868         t->tv_sec = (long)tb.time;
1869         t->tv_usec = (long)tb.millitm * 1000;
1870 #elif defined(OPENSSL_SYS_VMS)
1871         struct timeb tb;
1872         ftime(&tb);
1873         t->tv_sec = (long)tb.time;
1874         t->tv_usec = (long)tb.millitm * 1000;
1875 #else
1876         gettimeofday(t, NULL);
1877 #endif
1878         }
1879
1880 #endif