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
64 #ifdef OPENSSL_SYS_VMS
70 #include <openssl/bio.h>
72 #ifdef OPENSSL_SYS_WIN32
73 #include <sys/timeb.h>
76 #define IP_MTU 14 /* linux is lame */
79 #define sock_write SockWrite /* Watt-32 uses same names */
80 #define sock_read SockRead
81 #define sock_puts SockPuts
84 static int dgram_write(BIO *h, const char *buf, int num);
85 static int dgram_read(BIO *h, char *buf, int size);
86 static int dgram_puts(BIO *h, const char *str);
87 static long dgram_ctrl(BIO *h, int cmd, long arg1, void *arg2);
88 static int dgram_new(BIO *h);
89 static int dgram_free(BIO *data);
90 static int dgram_clear(BIO *bio);
92 static int BIO_dgram_should_retry(int s);
94 static BIO_METHOD methods_dgramp=
101 NULL, /* dgram_gets, */
108 typedef struct bio_dgram_data_st
110 struct sockaddr peer;
111 unsigned int connected;
114 struct timeval hstimeoutdiff;
115 struct timeval hstimeout;
118 BIO_METHOD *BIO_s_datagram(void)
120 return(&methods_dgramp);
123 BIO *BIO_new_dgram(int fd, int close_flag)
127 ret=BIO_new(BIO_s_datagram());
128 if (ret == NULL) return(NULL);
129 BIO_set_fd(ret,fd,close_flag);
133 static int dgram_new(BIO *bi)
135 bio_dgram_data *data = NULL;
139 data = OPENSSL_malloc(sizeof(bio_dgram_data));
142 memset(data, 0x00, sizeof(bio_dgram_data));
149 static int dgram_free(BIO *a)
151 bio_dgram_data *data;
153 if (a == NULL) return(0);
154 if ( ! dgram_clear(a))
157 data = (bio_dgram_data *)a->ptr;
158 if(data != NULL) OPENSSL_free(data);
163 static int dgram_clear(BIO *a)
165 if (a == NULL) return(0);
178 static int dgram_read(BIO *b, char *out, int outl)
181 bio_dgram_data *data = (bio_dgram_data *)b->ptr;
183 struct sockaddr peer;
184 int peerlen = sizeof(peer);
188 clear_socket_error();
189 memset(&peer, 0x00, peerlen);
190 /* Last arg in recvfrom is signed on some platforms and
191 * unsigned on others. It is of type socklen_t on some
192 * but this is not universal. Cast to (void *) to avoid
195 ret=recvfrom(b->num,out,outl,0,&peer,(void *)&peerlen);
197 if ( ! data->connected && ret > 0)
198 BIO_ctrl(b, BIO_CTRL_DGRAM_CONNECT, 0, &peer);
200 BIO_clear_retry_flags(b);
203 if (BIO_dgram_should_retry(ret))
205 BIO_set_retry_read(b);
206 data->_errno = get_last_socket_error();
208 memset(&(data->hstimeout), 0, sizeof(struct timeval));
212 if (data->hstimeout.tv_sec > 0 || data->hstimeout.tv_usec > 0)
214 struct timeval curtime;
215 #ifdef OPENSSL_SYS_WIN32
218 curtime.tv_sec = (long)tb.time;
219 curtime.tv_usec = (long)tb.millitm * 1000;
221 gettimeofday(&curtime, NULL);
224 if (curtime.tv_sec >= data->hstimeout.tv_sec &&
225 curtime.tv_usec >= data->hstimeout.tv_usec)
227 data->_errno = EAGAIN;
229 memset(&(data->hstimeout), 0, sizeof(struct timeval));
237 static int dgram_write(BIO *b, const char *in, int inl)
240 bio_dgram_data *data = (bio_dgram_data *)b->ptr;
241 clear_socket_error();
243 if ( data->connected )
244 ret=writesocket(b->num,in,inl);
246 #if defined(NETWARE_CLIB) && defined(NETWARE_BSDSOCK)
247 ret=sendto(b->num, (char *)in, inl, 0, &data->peer, sizeof(data->peer));
249 ret=sendto(b->num, in, inl, 0, &data->peer, sizeof(data->peer));
252 BIO_clear_retry_flags(b);
255 if (BIO_sock_should_retry(ret))
257 BIO_set_retry_write(b);
258 data->_errno = get_last_socket_error();
260 #if 0 /* higher layers are responsible for querying MTU, if necessary */
261 if ( data->_errno == EMSGSIZE)
262 /* retrieve the new MTU */
263 BIO_ctrl(b, BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
270 static long dgram_ctrl(BIO *b, int cmd, long num, void *ptr)
274 struct sockaddr *to = NULL;
275 bio_dgram_data *data = NULL;
276 long sockopt_val = 0;
277 unsigned int sockopt_len = 0;
279 data = (bio_dgram_data *)b->ptr;
285 case BIO_C_FILE_SEEK:
288 case BIO_C_FILE_TELL:
294 b->num= *((int *)ptr);
295 b->shutdown=(int)num;
302 if (ip != NULL) *ip=b->num;
308 case BIO_CTRL_GET_CLOSE:
311 case BIO_CTRL_SET_CLOSE:
312 b->shutdown=(int)num;
314 case BIO_CTRL_PENDING:
315 case BIO_CTRL_WPENDING:
322 case BIO_CTRL_DGRAM_CONNECT:
323 to = (struct sockaddr *)ptr;
325 if (connect(b->num, to, sizeof(struct sockaddr)) < 0)
326 { perror("connect"); ret = 0; }
330 memcpy(&(data->peer),to, sizeof(struct sockaddr));
335 /* (Linux)kernel sets DF bit on outgoing IP packets */
336 #ifdef IP_MTU_DISCOVER
337 case BIO_CTRL_DGRAM_MTU_DISCOVER:
338 sockopt_val = IP_PMTUDISC_DO;
339 if ((ret = setsockopt(b->num, IPPROTO_IP, IP_MTU_DISCOVER,
340 &sockopt_val, sizeof(sockopt_val))) < 0)
341 perror("setsockopt");
344 case BIO_CTRL_DGRAM_QUERY_MTU:
345 sockopt_len = sizeof(sockopt_val);
346 if ((ret = getsockopt(b->num, IPPROTO_IP, IP_MTU, (void *)&sockopt_val,
347 &sockopt_len)) < 0 || sockopt_val < 0)
351 data->mtu = sockopt_val;
355 case BIO_CTRL_DGRAM_GET_MTU:
358 case BIO_CTRL_DGRAM_SET_MTU:
362 case BIO_CTRL_DGRAM_SET_CONNECTED:
363 to = (struct sockaddr *)ptr;
368 memcpy(&(data->peer),to, sizeof(struct sockaddr));
373 memset(&(data->peer), 0x00, sizeof(struct sockaddr));
376 case BIO_CTRL_DGRAM_SET_PEER:
377 to = (struct sockaddr *) ptr;
379 memcpy(&(data->peer), to, sizeof(struct sockaddr));
381 case BIO_CTRL_DGRAM_SET_TIMEOUT:
384 #ifdef OPENSSL_SYS_WIN32
387 data->hstimeout.tv_sec = (long)tb.time;
388 data->hstimeout.tv_usec = (long)tb.millitm * 1000;
390 gettimeofday(&(data->hstimeout), NULL);
392 data->hstimeout.tv_sec += data->hstimeoutdiff.tv_sec;
393 data->hstimeout.tv_usec += data->hstimeoutdiff.tv_usec;
394 if (data->hstimeout.tv_usec >= 1000000)
396 data->hstimeout.tv_sec++;
397 data->hstimeout.tv_usec -= 1000000;
402 memset(&(data->hstimeout), 0, sizeof(struct timeval));
405 #if defined(SO_RCVTIMEO)
406 case BIO_CTRL_DGRAM_SET_RECV_TIMEOUT:
407 #ifdef OPENSSL_SYS_WINDOWS
409 struct timeval *tv = (struct timeval *)ptr;
410 int timeout = tv->tv_sec * 1000 + tv->tv_usec/1000;
411 if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
412 (void*)&timeout, sizeof(timeout)) < 0)
413 { perror("setsockopt"); ret = -1; }
416 if ( setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, ptr,
417 sizeof(struct timeval)) < 0)
418 { perror("setsockopt"); ret = -1; }
420 memcpy(&(data->hstimeoutdiff), ptr, sizeof(struct timeval));
422 case BIO_CTRL_DGRAM_GET_RECV_TIMEOUT:
423 #ifdef OPENSSL_SYS_WINDOWS
425 int timeout, sz = sizeof(timeout);
426 struct timeval *tv = (struct timeval *)ptr;
427 if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
428 (void*)&timeout, &sz) < 0)
429 { perror("getsockopt"); ret = -1; }
432 tv->tv_sec = timeout / 1000;
433 tv->tv_usec = (timeout % 1000) * 1000;
438 if ( getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
439 ptr, (void *)&ret) < 0)
440 { perror("getsockopt"); ret = -1; }
444 #if defined(SO_SNDTIMEO)
445 case BIO_CTRL_DGRAM_SET_SEND_TIMEOUT:
446 #ifdef OPENSSL_SYS_WINDOWS
448 struct timeval *tv = (struct timeval *)ptr;
449 int timeout = tv->tv_sec * 1000 + tv->tv_usec/1000;
450 if (setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
451 (void*)&timeout, sizeof(timeout)) < 0)
452 { perror("setsockopt"); ret = -1; }
455 if ( setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO, ptr,
456 sizeof(struct timeval)) < 0)
457 { perror("setsockopt"); ret = -1; }
460 case BIO_CTRL_DGRAM_GET_SEND_TIMEOUT:
461 #ifdef OPENSSL_SYS_WINDOWS
463 int timeout, sz = sizeof(timeout);
464 struct timeval *tv = (struct timeval *)ptr;
465 if (getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
466 (void*)&timeout, &sz) < 0)
467 { perror("getsockopt"); ret = -1; }
470 tv->tv_sec = timeout / 1000;
471 tv->tv_usec = (timeout % 1000) * 1000;
476 if ( getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
477 ptr, (void *)&ret) < 0)
478 { perror("getsockopt"); ret = -1; }
482 case BIO_CTRL_DGRAM_GET_SEND_TIMER_EXP:
484 case BIO_CTRL_DGRAM_GET_RECV_TIMER_EXP:
485 #ifdef OPENSSL_SYS_WINDOWS
486 if ( data->_errno == WSAETIMEDOUT)
488 if ( data->_errno == EAGAIN)
498 case BIO_CTRL_DGRAM_MTU_EXCEEDED:
499 if ( data->_errno == EMSGSIZE)
515 static int dgram_puts(BIO *bp, const char *str)
520 ret=dgram_write(bp,str,n);
524 static int BIO_dgram_should_retry(int i)
528 if ((i == 0) || (i == -1))
530 err=get_last_socket_error();
532 #if defined(OPENSSL_SYS_WINDOWS) && 0 /* more microsoft stupidity? perhaps not? Ben 4/1/99 */
533 if ((i == -1) && (err == 0))
537 return(BIO_dgram_non_fatal_error(err));
542 int BIO_dgram_non_fatal_error(int err)
546 #if defined(OPENSSL_SYS_WINDOWS)
547 # if defined(WSAEWOULDBLOCK)
551 # if 0 /* This appears to always be an error */
552 # if defined(WSAENOTCONN)
559 # ifdef WSAEWOULDBLOCK
560 # if WSAEWOULDBLOCK != EWOULDBLOCK
568 #if defined(ENOTCONN)
577 #if EWOULDBLOCK != EAGAIN
594 /* DF bit set, and packet larger than MTU */