1 /* crypto/bio/bio_dgram.c */
3 * DTLS implementation written by Nagendra Modadugu
4 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
6 /* ====================================================================
7 * Copyright (c) 1999-2005 The OpenSSL Project. All rights reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
35 * 6. Redistributions of any form whatsoever must retain the following
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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 * ====================================================================
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).
60 #ifndef OPENSSL_NO_DGRAM
67 #include <openssl/bio.h>
69 #if defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_VMS)
70 #include <sys/timeb.h>
73 #define IP_MTU 14 /* linux is lame */
76 #define sock_write SockWrite /* Watt-32 uses same names */
77 #define sock_read SockRead
78 #define sock_puts SockPuts
81 static int dgram_write(BIO
*h
, const char *buf
, int num
);
82 static int dgram_read(BIO
*h
, char *buf
, int size
);
83 static int dgram_puts(BIO
*h
, const char *str
);
84 static long dgram_ctrl(BIO
*h
, int cmd
, long arg1
, void *arg2
);
85 static int dgram_new(BIO
*h
);
86 static int dgram_free(BIO
*data
);
87 static int dgram_clear(BIO
*bio
);
89 static int BIO_dgram_should_retry(int s
);
91 static void get_current_time(struct timeval
*t
);
93 static BIO_METHOD methods_dgramp
=
100 NULL
, /* dgram_gets, */
107 typedef struct bio_dgram_data_st
109 struct sockaddr peer
;
110 unsigned int connected
;
113 struct timeval next_timeout
;
114 struct timeval socket_timeout
;
117 BIO_METHOD
*BIO_s_datagram(void)
119 return(&methods_dgramp
);
122 BIO
*BIO_new_dgram(int fd
, int close_flag
)
126 ret
=BIO_new(BIO_s_datagram());
127 if (ret
== NULL
) return(NULL
);
128 BIO_set_fd(ret
,fd
,close_flag
);
132 static int dgram_new(BIO
*bi
)
134 bio_dgram_data
*data
= NULL
;
138 data
= OPENSSL_malloc(sizeof(bio_dgram_data
));
141 memset(data
, 0x00, sizeof(bio_dgram_data
));
148 static int dgram_free(BIO
*a
)
150 bio_dgram_data
*data
;
152 if (a
== NULL
) return(0);
153 if ( ! dgram_clear(a
))
156 data
= (bio_dgram_data
*)a
->ptr
;
157 if(data
!= NULL
) OPENSSL_free(data
);
162 static int dgram_clear(BIO
*a
)
164 if (a
== NULL
) return(0);
177 static void dgram_adjust_rcv_timeout(BIO
*b
)
179 #if defined(SO_RCVTIMEO)
180 bio_dgram_data
*data
= (bio_dgram_data
*)b
->ptr
;
181 int sz
= sizeof(int);
183 /* Is a timer active? */
184 if (data
->next_timeout
.tv_sec
> 0 || data
->next_timeout
.tv_usec
> 0)
186 struct timeval timenow
, timeleft
;
188 /* Read current socket timeout */
189 #ifdef OPENSSL_SYS_WINDOWS
191 if (getsockopt(b
->num
, SOL_SOCKET
, SO_RCVTIMEO
,
192 (void*)&timeout
, &sz
) < 0)
193 { perror("getsockopt"); }
196 data
->socket_timeout
.tv_sec
= timeout
/ 1000;
197 data
->socket_timeout
.tv_usec
= (timeout
% 1000) * 1000;
200 if ( getsockopt(b
->num
, SOL_SOCKET
, SO_RCVTIMEO
,
201 &(data
->socket_timeout
), (void *)&sz
) < 0)
202 { perror("getsockopt"); }
205 /* Get current time */
206 get_current_time(&timenow
);
208 /* Calculate time left until timer expires */
209 memcpy(&timeleft
, &(data
->next_timeout
), sizeof(struct timeval
));
210 timeleft
.tv_sec
-= timenow
.tv_sec
;
211 timeleft
.tv_usec
-= timenow
.tv_usec
;
212 if (timeleft
.tv_usec
< 0)
215 timeleft
.tv_usec
+= 1000000;
218 /* Adjust socket timeout if next handhake message timer
219 * will expire earlier.
221 if (data
->socket_timeout
.tv_sec
< timeleft
.tv_sec
||
222 (data
->socket_timeout
.tv_sec
== timeleft
.tv_sec
&&
223 data
->socket_timeout
.tv_usec
<= timeleft
.tv_usec
))
225 #ifdef OPENSSL_SYS_WINDOWS
226 timeout
= timeleft
.tv_sec
* 1000 + timeleft
.tv_usec
/ 1000;
227 if (setsockopt(b
->num
, SOL_SOCKET
, SO_RCVTIMEO
,
228 (void*)&timeout
, sizeof(timeout
)) < 0)
229 { perror("setsockopt"); }
231 if ( setsockopt(b
->num
, SOL_SOCKET
, SO_RCVTIMEO
, &timeleft
,
232 sizeof(struct timeval
)) < 0)
233 { perror("setsockopt"); }
240 static void dgram_reset_rcv_timeout(BIO
*b
)
242 #if defined(SO_RCVTIMEO)
243 bio_dgram_data
*data
= (bio_dgram_data
*)b
->ptr
;
244 #ifdef OPENSSL_SYS_WINDOWS
245 int timeout
= data
->socket_timeout
.tv_sec
* 1000 +
246 data
->socket_timeout
.tv_usec
/ 1000;
247 if (setsockopt(b
->num
, SOL_SOCKET
, SO_RCVTIMEO
,
248 (void*)&timeout
, sizeof(timeout
)) < 0)
249 { perror("setsockopt"); }
251 if ( setsockopt(b
->num
, SOL_SOCKET
, SO_RCVTIMEO
, &(data
->socket_timeout
),
252 sizeof(struct timeval
)) < 0)
253 { perror("setsockopt"); }
258 static int dgram_read(BIO
*b
, char *out
, int outl
)
261 bio_dgram_data
*data
= (bio_dgram_data
*)b
->ptr
;
263 struct sockaddr peer
;
264 int peerlen
= sizeof(peer
);
268 clear_socket_error();
269 memset(&peer
, 0x00, peerlen
);
270 /* Last arg in recvfrom is signed on some platforms and
271 * unsigned on others. It is of type socklen_t on some
272 * but this is not universal. Cast to (void *) to avoid
275 dgram_adjust_rcv_timeout(b
);
276 ret
=recvfrom(b
->num
,out
,outl
,0,&peer
,(void *)&peerlen
);
277 dgram_reset_rcv_timeout(b
);
279 if ( ! data
->connected
&& ret
> 0)
280 BIO_ctrl(b
, BIO_CTRL_DGRAM_CONNECT
, 0, &peer
);
282 BIO_clear_retry_flags(b
);
285 if (BIO_dgram_should_retry(ret
))
287 BIO_set_retry_read(b
);
288 data
->_errno
= get_last_socket_error();
290 memset(&(data
->hstimeout
), 0, sizeof(struct timeval
));
296 static int dgram_write(BIO
*b
, const char *in
, int inl
)
299 bio_dgram_data
*data
= (bio_dgram_data
*)b
->ptr
;
300 clear_socket_error();
302 if ( data
->connected
)
303 ret
=writesocket(b
->num
,in
,inl
);
305 #if defined(NETWARE_CLIB) && defined(NETWARE_BSDSOCK)
306 ret
=sendto(b
->num
, (char *)in
, inl
, 0, &data
->peer
, sizeof(data
->peer
));
308 ret
=sendto(b
->num
, in
, inl
, 0, &data
->peer
, sizeof(data
->peer
));
311 BIO_clear_retry_flags(b
);
314 if (BIO_sock_should_retry(ret
))
316 BIO_set_retry_write(b
);
317 data
->_errno
= get_last_socket_error();
319 #if 0 /* higher layers are responsible for querying MTU, if necessary */
320 if ( data
->_errno
== EMSGSIZE
)
321 /* retrieve the new MTU */
322 BIO_ctrl(b
, BIO_CTRL_DGRAM_QUERY_MTU
, 0, NULL
);
329 static long dgram_ctrl(BIO
*b
, int cmd
, long num
, void *ptr
)
333 struct sockaddr
*to
= NULL
;
334 bio_dgram_data
*data
= NULL
;
335 long sockopt_val
= 0;
336 unsigned int sockopt_len
= 0;
338 data
= (bio_dgram_data
*)b
->ptr
;
344 case BIO_C_FILE_SEEK
:
347 case BIO_C_FILE_TELL
:
353 b
->num
= *((int *)ptr
);
354 b
->shutdown
=(int)num
;
361 if (ip
!= NULL
) *ip
=b
->num
;
367 case BIO_CTRL_GET_CLOSE
:
370 case BIO_CTRL_SET_CLOSE
:
371 b
->shutdown
=(int)num
;
373 case BIO_CTRL_PENDING
:
374 case BIO_CTRL_WPENDING
:
381 case BIO_CTRL_DGRAM_CONNECT
:
382 to
= (struct sockaddr
*)ptr
;
384 if (connect(b
->num
, to
, sizeof(struct sockaddr
)) < 0)
385 { perror("connect"); ret
= 0; }
389 memcpy(&(data
->peer
),to
, sizeof(struct sockaddr
));
394 /* (Linux)kernel sets DF bit on outgoing IP packets */
395 #ifdef IP_MTU_DISCOVER
396 case BIO_CTRL_DGRAM_MTU_DISCOVER
:
397 sockopt_val
= IP_PMTUDISC_DO
;
398 if ((ret
= setsockopt(b
->num
, IPPROTO_IP
, IP_MTU_DISCOVER
,
399 &sockopt_val
, sizeof(sockopt_val
))) < 0)
400 perror("setsockopt");
403 case BIO_CTRL_DGRAM_QUERY_MTU
:
404 sockopt_len
= sizeof(sockopt_val
);
405 if ((ret
= getsockopt(b
->num
, IPPROTO_IP
, IP_MTU
, (void *)&sockopt_val
,
406 &sockopt_len
)) < 0 || sockopt_val
< 0)
410 data
->mtu
= sockopt_val
;
414 case BIO_CTRL_DGRAM_GET_MTU
:
417 case BIO_CTRL_DGRAM_SET_MTU
:
421 case BIO_CTRL_DGRAM_SET_CONNECTED
:
422 to
= (struct sockaddr
*)ptr
;
427 memcpy(&(data
->peer
),to
, sizeof(struct sockaddr
));
432 memset(&(data
->peer
), 0x00, sizeof(struct sockaddr
));
435 case BIO_CTRL_DGRAM_SET_PEER
:
436 to
= (struct sockaddr
*) ptr
;
438 memcpy(&(data
->peer
), to
, sizeof(struct sockaddr
));
440 case BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT
:
441 memcpy(&(data
->next_timeout
), ptr
, sizeof(struct timeval
));
443 #if defined(SO_RCVTIMEO)
444 case BIO_CTRL_DGRAM_SET_RECV_TIMEOUT
:
445 #ifdef OPENSSL_SYS_WINDOWS
447 struct timeval
*tv
= (struct timeval
*)ptr
;
448 int timeout
= tv
->tv_sec
* 1000 + tv
->tv_usec
/1000;
449 if (setsockopt(b
->num
, SOL_SOCKET
, SO_RCVTIMEO
,
450 (void*)&timeout
, sizeof(timeout
)) < 0)
451 { perror("setsockopt"); ret
= -1; }
454 if ( setsockopt(b
->num
, SOL_SOCKET
, SO_RCVTIMEO
, ptr
,
455 sizeof(struct timeval
)) < 0)
456 { perror("setsockopt"); ret
= -1; }
459 case BIO_CTRL_DGRAM_GET_RECV_TIMEOUT
:
460 #ifdef OPENSSL_SYS_WINDOWS
462 int timeout
, sz
= sizeof(timeout
);
463 struct timeval
*tv
= (struct timeval
*)ptr
;
464 if (getsockopt(b
->num
, SOL_SOCKET
, SO_RCVTIMEO
,
465 (void*)&timeout
, &sz
) < 0)
466 { perror("getsockopt"); ret
= -1; }
469 tv
->tv_sec
= timeout
/ 1000;
470 tv
->tv_usec
= (timeout
% 1000) * 1000;
475 if ( getsockopt(b
->num
, SOL_SOCKET
, SO_RCVTIMEO
,
476 ptr
, (void *)&ret
) < 0)
477 { perror("getsockopt"); ret
= -1; }
481 #if defined(SO_SNDTIMEO)
482 case BIO_CTRL_DGRAM_SET_SEND_TIMEOUT
:
483 #ifdef OPENSSL_SYS_WINDOWS
485 struct timeval
*tv
= (struct timeval
*)ptr
;
486 int timeout
= tv
->tv_sec
* 1000 + tv
->tv_usec
/1000;
487 if (setsockopt(b
->num
, SOL_SOCKET
, SO_SNDTIMEO
,
488 (void*)&timeout
, sizeof(timeout
)) < 0)
489 { perror("setsockopt"); ret
= -1; }
492 if ( setsockopt(b
->num
, SOL_SOCKET
, SO_SNDTIMEO
, ptr
,
493 sizeof(struct timeval
)) < 0)
494 { perror("setsockopt"); ret
= -1; }
497 case BIO_CTRL_DGRAM_GET_SEND_TIMEOUT
:
498 #ifdef OPENSSL_SYS_WINDOWS
500 int timeout
, sz
= sizeof(timeout
);
501 struct timeval
*tv
= (struct timeval
*)ptr
;
502 if (getsockopt(b
->num
, SOL_SOCKET
, SO_SNDTIMEO
,
503 (void*)&timeout
, &sz
) < 0)
504 { perror("getsockopt"); ret
= -1; }
507 tv
->tv_sec
= timeout
/ 1000;
508 tv
->tv_usec
= (timeout
% 1000) * 1000;
513 if ( getsockopt(b
->num
, SOL_SOCKET
, SO_SNDTIMEO
,
514 ptr
, (void *)&ret
) < 0)
515 { perror("getsockopt"); ret
= -1; }
519 case BIO_CTRL_DGRAM_GET_SEND_TIMER_EXP
:
521 case BIO_CTRL_DGRAM_GET_RECV_TIMER_EXP
:
522 #ifdef OPENSSL_SYS_WINDOWS
523 if ( data
->_errno
== WSAETIMEDOUT
)
525 if ( data
->_errno
== EAGAIN
)
535 case BIO_CTRL_DGRAM_MTU_EXCEEDED
:
536 if ( data
->_errno
== EMSGSIZE
)
552 static int dgram_puts(BIO
*bp
, const char *str
)
557 ret
=dgram_write(bp
,str
,n
);
561 static int BIO_dgram_should_retry(int i
)
565 if ((i
== 0) || (i
== -1))
567 err
=get_last_socket_error();
569 #if defined(OPENSSL_SYS_WINDOWS) && 0 /* more microsoft stupidity? perhaps not? Ben 4/1/99 */
570 if ((i
== -1) && (err
== 0))
574 return(BIO_dgram_non_fatal_error(err
));
579 int BIO_dgram_non_fatal_error(int err
)
583 #if defined(OPENSSL_SYS_WINDOWS)
584 # if defined(WSAEWOULDBLOCK)
588 # if 0 /* This appears to always be an error */
589 # if defined(WSAENOTCONN)
596 # ifdef WSAEWOULDBLOCK
597 # if WSAEWOULDBLOCK != EWOULDBLOCK
605 #if defined(ENOTCONN)
614 #if EWOULDBLOCK != EAGAIN
631 /* DF bit set, and packet larger than MTU */
645 static void get_current_time(struct timeval
*t
)
647 #ifdef OPENSSL_SYS_WIN32
650 t
->tv_sec
= (long)tb
.time
;
651 t
->tv_usec
= (long)tb
.millitm
* 1000;
652 #elif defined(OPENSSL_SYS_VMS)
655 t
->tv_sec
= (long)tb
.time
;
656 t
->tv_usec
= (long)tb
.millitm
* 1000;
658 gettimeofday(t
, NULL
);