crypto/openssl-0.9/crypto/bio/bss_dgram.c

   1 /* crypto/bio/bio_dgram.c */
   2 /*
   3  * DTLS implementation written by Nagendra Modadugu
   4  * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 1999-2005 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    openssl-core@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59
  60 #ifndef OPENSSL_NO_DGRAM
  61
  62 #include <stdio.h>
  63 #include <errno.h>
  64 #define USE_SOCKETS
  65 #include "cryptlib.h"
  66
  67 #include <openssl/bio.h>
  68
  69 #define IP_MTU      14 /* linux is lame */
  70
  71 #ifdef WATT32
  72 #define sock_write SockWrite  /* Watt-32 uses same names */
  73 #define sock_read  SockRead
  74 #define sock_puts  SockPuts
  75 #endif
  76
  77 static int dgram_write(BIO *h, const char *buf, int num);
  78 static int dgram_read(BIO *h, char *buf, int size);
  79 static int dgram_puts(BIO *h, const char *str);
  80 static long dgram_ctrl(BIO *h, int cmd, long arg1, void *arg2);
  81 static int dgram_new(BIO *h);
  82 static int dgram_free(BIO *data);
  83 static int dgram_clear(BIO *bio);
  84
  85 int BIO_dgram_should_retry(int s);
  86
  87 static BIO_METHOD methods_dgramp=
  88         {
  89         BIO_TYPE_DGRAM,
  90         "datagram socket",
  91         dgram_write,
  92         dgram_read,
  93         dgram_puts,
  94         NULL, /* dgram_gets, */
  95         dgram_ctrl,
  96         dgram_new,
  97         dgram_free,
  98         NULL,
  99         };
 100
 101 typedef struct bio_dgram_data_st
 102         {
 103         struct sockaddr peer;
 104         unsigned int connected;
 105         unsigned int _errno;
 106         unsigned int mtu;
 107         } bio_dgram_data;
 108
 109 BIO_METHOD *BIO_s_datagram(void)
 110         {
 111         return(&methods_dgramp);
 112         }
 113
 114 BIO *BIO_new_dgram(int fd, int close_flag)
 115         {
 116         BIO *ret;
 117
 118         ret=BIO_new(BIO_s_datagram());
 119         if (ret == NULL) return(NULL);
 120         BIO_set_fd(ret,fd,close_flag);
 121         return(ret);
 122         }
 123
 124 static int dgram_new(BIO *bi)
 125         {
 126         bio_dgram_data *data = NULL;
 127
 128         bi->init=0;
 129         bi->num=0;
 130         data = OPENSSL_malloc(sizeof(bio_dgram_data));
 131         if (data == NULL)
 132                 return 0;
 133         memset(data, 0x00, sizeof(bio_dgram_data));
 134     bi->ptr = data;
 135
 136         bi->flags=0;
 137         return(1);
 138         }
 139
 140 static int dgram_free(BIO *a)
 141         {
 142         bio_dgram_data *data;
 143
 144         if (a == NULL) return(0);
 145         if ( ! dgram_clear(a))
 146                 return 0;
 147
 148         data = (bio_dgram_data *)a->ptr;
 149         if(data != NULL) OPENSSL_free(data);
 150
 151         return(1);
 152         }
 153
 154 static int dgram_clear(BIO *a)
 155         {
 156         if (a == NULL) return(0);
 157         if (a->shutdown)
 158                 {
 159                 if (a->init)
 160                         {
 161                         SHUTDOWN2(a->num);
 162                         }
 163                 a->init=0;
 164                 a->flags=0;
 165                 }
 166         return(1);
 167         }
 168
 169 static int dgram_read(BIO *b, char *out, int outl)
 170         {
 171         int ret=0;
 172         bio_dgram_data *data = (bio_dgram_data *)b->ptr;
 173
 174         struct sockaddr peer;
 175         int peerlen = sizeof(peer);
 176
 177         if (out != NULL)
 178                 {
 179                 clear_socket_error();
 180                 memset(&peer, 0x00, peerlen);
 181                 /* Last arg in recvfrom is signed on some platforms and
 182                  * unsigned on others. It is of type socklen_t on some
 183                  * but this is not universal. Cast to (void *) to avoid
 184                  * compiler warnings.
 185                  */
 186                 ret=recvfrom(b->num,out,outl,0,&peer,(void *)&peerlen);
 187
 188                 if ( ! data->connected  && ret > 0)
 189                         BIO_ctrl(b, BIO_CTRL_DGRAM_CONNECT, 0, &peer);
 190
 191                 BIO_clear_retry_flags(b);
 192                 if (ret <= 0)
 193                         {
 194                         if (BIO_dgram_should_retry(ret))
 195                                 {
 196                                 BIO_set_retry_read(b);
 197                                 data->_errno = get_last_socket_error();
 198                                 }
 199                         }
 200                 }
 201         return(ret);
 202         }
 203
 204 static int dgram_write(BIO *b, const char *in, int inl)
 205         {
 206         int ret;
 207         bio_dgram_data *data = (bio_dgram_data *)b->ptr;
 208         clear_socket_error();
 209
 210     if ( data->connected )
 211         ret=send(b->num,in,inl,0);
 212     else
 213         ret=sendto(b->num, in, inl, 0, &data->peer, sizeof(data->peer));
 214
 215         BIO_clear_retry_flags(b);
 216         if (ret <= 0)
 217                 {
 218                 if (BIO_sock_should_retry(ret))
 219                         {
 220                         BIO_set_retry_write(b);
 221                         data->_errno = get_last_socket_error();
 222
 223 #if 0 /* higher layers are responsible for querying MTU, if necessary */
 224                         if ( data->_errno == EMSGSIZE)
 225                                 /* retrieve the new MTU */
 226                                 BIO_ctrl(b, BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
 227 #endif
 228                         }
 229                 }
 230         return(ret);
 231         }
 232
 233 static long dgram_ctrl(BIO *b, int cmd, long num, void *ptr)
 234         {
 235         long ret=1;
 236         int *ip;
 237         struct sockaddr *to = NULL;
 238         bio_dgram_data *data = NULL;
 239         long sockopt_val = 0;
 240         unsigned int sockopt_len = 0;
 241
 242         data = (bio_dgram_data *)b->ptr;
 243
 244         switch (cmd)
 245                 {
 246         case BIO_CTRL_RESET:
 247                 num=0;
 248         case BIO_C_FILE_SEEK:
 249                 ret=0;
 250                 break;
 251         case BIO_C_FILE_TELL:
 252         case BIO_CTRL_INFO:
 253                 ret=0;
 254                 break;
 255         case BIO_C_SET_FD:
 256                 dgram_clear(b);
 257                 b->num= *((int *)ptr);
 258                 b->shutdown=(int)num;
 259                 b->init=1;
 260                 break;
 261         case BIO_C_GET_FD:
 262                 if (b->init)
 263                         {
 264                         ip=(int *)ptr;
 265                         if (ip != NULL) *ip=b->num;
 266                         ret=b->num;
 267                         }
 268                 else
 269                         ret= -1;
 270                 break;
 271         case BIO_CTRL_GET_CLOSE:
 272                 ret=b->shutdown;
 273                 break;
 274         case BIO_CTRL_SET_CLOSE:
 275                 b->shutdown=(int)num;
 276                 break;
 277         case BIO_CTRL_PENDING:
 278         case BIO_CTRL_WPENDING:
 279                 ret=0;
 280                 break;
 281         case BIO_CTRL_DUP:
 282         case BIO_CTRL_FLUSH:
 283                 ret=1;
 284                 break;
 285         case BIO_CTRL_DGRAM_CONNECT:
 286                 to = (struct sockaddr *)ptr;
 287 #if 0
 288                 if (connect(b->num, to, sizeof(struct sockaddr)) < 0)
 289                         { perror("connect"); ret = 0; }
 290                 else
 291                         {
 292 #endif
 293                         memcpy(&(data->peer),to, sizeof(struct sockaddr));
 294 #if 0
 295                         }
 296 #endif
 297                 break;
 298                 /* (Linux)kernel sets DF bit on outgoing IP packets */
 299 #ifdef IP_MTU_DISCOVER
 300         case BIO_CTRL_DGRAM_MTU_DISCOVER:
 301                 sockopt_val = IP_PMTUDISC_DO;
 302                 if ((ret = setsockopt(b->num, IPPROTO_IP, IP_MTU_DISCOVER,
 303                         &sockopt_val, sizeof(sockopt_val))) < 0)
 304                         perror("setsockopt");
 305                 break;
 306 #endif
 307         case BIO_CTRL_DGRAM_QUERY_MTU:
 308          sockopt_len = sizeof(sockopt_val);
 309                 if ((ret = getsockopt(b->num, IPPROTO_IP, IP_MTU, (void *)&sockopt_val,
 310                         &sockopt_len)) < 0 || sockopt_val < 0)
 311                         { ret = 0; }
 312                 else
 313                         {
 314                         data->mtu = sockopt_val;
 315                         ret = data->mtu;
 316                         }
 317                 break;
 318         case BIO_CTRL_DGRAM_GET_MTU:
 319                 return data->mtu;
 320                 break;
 321         case BIO_CTRL_DGRAM_SET_MTU:
 322                 data->mtu = num;
 323                 ret = num;
 324                 break;
 325         case BIO_CTRL_DGRAM_SET_CONNECTED:
 326                 to = (struct sockaddr *)ptr;
 327
 328                 if ( to != NULL)
 329                         {
 330                         data->connected = 1;
 331                         memcpy(&(data->peer),to, sizeof(struct sockaddr));
 332                         }
 333                 else
 334                         {
 335                         data->connected = 0;
 336                         memset(&(data->peer), 0x00, sizeof(struct sockaddr));
 337                         }
 338                 break;
 339     case BIO_CTRL_DGRAM_SET_PEER:
 340         to = (struct sockaddr *) ptr;
 341
 342         memcpy(&(data->peer), to, sizeof(struct sockaddr));
 343         break;
 344         case BIO_CTRL_DGRAM_SET_RECV_TIMEOUT:
 345                 if ( setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, ptr,
 346                         sizeof(struct timeval)) < 0)
 347                         { perror("setsockopt"); ret = -1; }
 348                 break;
 349         case BIO_CTRL_DGRAM_GET_RECV_TIMEOUT:
 350                 if ( getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 351                         ptr, (void *)&ret) < 0)
 352                         { perror("getsockopt"); ret = -1; }
 353                 break;
 354         case BIO_CTRL_DGRAM_SET_SEND_TIMEOUT:
 355                 if ( setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO, ptr,
 356                         sizeof(struct timeval)) < 0)
 357                         { perror("setsockopt"); ret = -1; }
 358                 break;
 359         case BIO_CTRL_DGRAM_GET_SEND_TIMEOUT:
 360                 if ( getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
 361                         ptr, (void *)&ret) < 0)
 362                         { perror("getsockopt"); ret = -1; }
 363                 break;
 364         case BIO_CTRL_DGRAM_GET_SEND_TIMER_EXP:
 365                 /* fall-through */
 366         case BIO_CTRL_DGRAM_GET_RECV_TIMER_EXP:
 367                 if ( data->_errno == EAGAIN)
 368                         {
 369                         ret = 1;
 370                         data->_errno = 0;
 371                         }
 372                 else
 373                         ret = 0;
 374                 break;
 375 #ifdef EMSGSIZE
 376         case BIO_CTRL_DGRAM_MTU_EXCEEDED:
 377                 if ( data->_errno == EMSGSIZE)
 378                         {
 379                         ret = 1;
 380                         data->_errno = 0;
 381                         }
 382                 else
 383                         ret = 0;
 384                 break;
 385 #endif
 386         default:
 387                 ret=0;
 388                 break;
 389                 }
 390         return(ret);
 391         }
 392
 393 static int dgram_puts(BIO *bp, const char *str)
 394         {
 395         int n,ret;
 396
 397         n=strlen(str);
 398         ret=dgram_write(bp,str,n);
 399         return(ret);
 400         }
 401
 402 int BIO_dgram_should_retry(int i)
 403         {
 404         int err;
 405
 406         if ((i == 0) || (i == -1))
 407                 {
 408                 err=get_last_socket_error();
 409
 410 #if defined(OPENSSL_SYS_WINDOWS) && 0 /* more microsoft stupidity? perhaps not? Ben 4/1/99 */
 411                 if ((i == -1) && (err == 0))
 412                         return(1);
 413 #endif
 414
 415                 return(BIO_dgram_non_fatal_error(err));
 416                 }
 417         return(0);
 418         }
 419
 420 int BIO_dgram_non_fatal_error(int err)
 421         {
 422         switch (err)
 423                 {
 424 #if defined(OPENSSL_SYS_WINDOWS)
 425 # if defined(WSAEWOULDBLOCK)
 426         case WSAEWOULDBLOCK:
 427 # endif
 428
 429 # if 0 /* This appears to always be an error */
 430 #  if defined(WSAENOTCONN)
 431         case WSAENOTCONN:
 432 #  endif
 433 # endif
 434 #endif
 435
 436 #ifdef EWOULDBLOCK
 437 # ifdef WSAEWOULDBLOCK
 438 #  if WSAEWOULDBLOCK != EWOULDBLOCK
 439         case EWOULDBLOCK:
 440 #  endif
 441 # else
 442         case EWOULDBLOCK:
 443 # endif
 444 #endif
 445
 446 #if defined(ENOTCONN)
 447         case ENOTCONN:
 448 #endif
 449
 450 #ifdef EINTR
 451         case EINTR:
 452 #endif
 453
 454 #ifdef EAGAIN
 455 #if EWOULDBLOCK != EAGAIN
 456         case EAGAIN:
 457 # endif
 458 #endif
 459
 460 #ifdef EPROTO
 461         case EPROTO:
 462 #endif
 463
 464 #ifdef EINPROGRESS
 465         case EINPROGRESS:
 466 #endif
 467
 468 #ifdef EALREADY
 469         case EALREADY:
 470 #endif
 471
 472 /* DF bit set, and packet larger than MTU */
 473 #ifdef EMSGSIZE
 474         case EMSGSIZE:
 475 #endif
 476
 477                 return(1);
 478                 /* break; */
 479         default:
 480                 break;
 481                 }
 482         return(0);
 483         }
 484 #endif