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 <sys/socket.h>
69 #include <openssl/bio.h>
71 #define IP_MTU 14 /* linux is lame */
74 #define sock_write SockWrite /* Watt-32 uses same names */
75 #define sock_read SockRead
76 #define sock_puts SockPuts
79 static int dgram_write(BIO *h, const char *buf, int num);
80 static int dgram_read(BIO *h, char *buf, int size);
81 static int dgram_puts(BIO *h, const char *str);
82 static long dgram_ctrl(BIO *h, int cmd, long arg1, void *arg2);
83 static int dgram_new(BIO *h);
84 static int dgram_free(BIO *data);
85 static int dgram_clear(BIO *bio);
87 int BIO_dgram_should_retry(int s);
89 static BIO_METHOD methods_dgramp=
96 NULL, /* dgram_gets, */
103 typedef struct bio_dgram_data_st
105 struct sockaddr peer;
106 unsigned int connected;
111 BIO_METHOD *BIO_s_datagram(void)
113 return(&methods_dgramp);
116 BIO *BIO_new_dgram(int fd, int close_flag)
120 ret=BIO_new(BIO_s_datagram());
121 if (ret == NULL) return(NULL);
122 BIO_set_fd(ret,fd,close_flag);
126 static int dgram_new(BIO *bi)
128 bio_dgram_data *data = NULL;
132 data = OPENSSL_malloc(sizeof(bio_dgram_data));
135 memset(data, 0x00, sizeof(bio_dgram_data));
142 static int dgram_free(BIO *a)
144 bio_dgram_data *data;
146 if (a == NULL) return(0);
147 if ( ! dgram_clear(a))
150 data = (bio_dgram_data *)a->ptr;
151 if(data != NULL) OPENSSL_free(data);
156 static int dgram_clear(BIO *a)
158 if (a == NULL) return(0);
171 static int dgram_read(BIO *b, char *out, int outl)
174 bio_dgram_data *data = (bio_dgram_data *)b->ptr;
176 struct sockaddr peer;
177 socklen_t peerlen = sizeof(peer);
181 clear_socket_error();
182 memset(&peer, 0x00, peerlen);
183 ret=recvfrom(b->num,out,outl,0,&peer,&peerlen);
185 if ( ! data->connected && ret > 0)
186 BIO_ctrl(b, BIO_CTRL_DGRAM_CONNECT, 0, &peer);
188 BIO_clear_retry_flags(b);
191 if (BIO_dgram_should_retry(ret))
193 BIO_set_retry_read(b);
194 data->_errno = get_last_socket_error();
201 static int dgram_write(BIO *b, const char *in, int inl)
204 bio_dgram_data *data = (bio_dgram_data *)b->ptr;
205 clear_socket_error();
207 if ( data->connected )
208 ret=send(b->num,in,inl,0);
210 ret=sendto(b->num, in, inl, 0, &data->peer, sizeof(data->peer));
212 BIO_clear_retry_flags(b);
215 if (BIO_sock_should_retry(ret))
217 BIO_set_retry_write(b);
218 data->_errno = get_last_socket_error();
220 #if 0 /* higher layers are responsible for querying MTU, if necessary */
221 if ( data->_errno == EMSGSIZE)
222 /* retrieve the new MTU */
223 BIO_ctrl(b, BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
230 static long dgram_ctrl(BIO *b, int cmd, long num, void *ptr)
234 struct sockaddr *to = NULL;
235 bio_dgram_data *data = NULL;
236 long sockopt_val = 0;
237 unsigned int sockopt_len = 0;
239 data = (bio_dgram_data *)b->ptr;
245 case BIO_C_FILE_SEEK:
248 case BIO_C_FILE_TELL:
254 b->num= *((int *)ptr);
255 b->shutdown=(int)num;
262 if (ip != NULL) *ip=b->num;
268 case BIO_CTRL_GET_CLOSE:
271 case BIO_CTRL_SET_CLOSE:
272 b->shutdown=(int)num;
274 case BIO_CTRL_PENDING:
275 case BIO_CTRL_WPENDING:
282 case BIO_CTRL_DGRAM_CONNECT:
283 to = (struct sockaddr *)ptr;
285 if (connect(b->num, to, sizeof(struct sockaddr)) < 0)
286 { perror("connect"); ret = 0; }
290 memcpy(&(data->peer),to, sizeof(struct sockaddr));
295 /* (Linux)kernel sets DF bit on outgoing IP packets */
296 #ifdef IP_MTU_DISCOVER
297 case BIO_CTRL_DGRAM_MTU_DISCOVER:
298 sockopt_val = IP_PMTUDISC_DO;
299 if ((ret = setsockopt(b->num, IPPROTO_IP, IP_MTU_DISCOVER,
300 &sockopt_val, sizeof(sockopt_val))) < 0)
301 perror("setsockopt");
304 case BIO_CTRL_DGRAM_QUERY_MTU:
305 sockopt_len = sizeof(sockopt_val);
306 if ((ret = getsockopt(b->num, IPPROTO_IP, IP_MTU, &sockopt_val,
307 &sockopt_len)) < 0 || sockopt_val < 0)
311 data->mtu = sockopt_val;
315 case BIO_CTRL_DGRAM_GET_MTU:
318 case BIO_CTRL_DGRAM_SET_MTU:
322 case BIO_CTRL_DGRAM_SET_CONNECTED:
323 to = (struct sockaddr *)ptr;
328 memcpy(&(data->peer),to, sizeof(struct sockaddr));
333 memset(&(data->peer), 0x00, sizeof(struct sockaddr));
336 case BIO_CTRL_DGRAM_SET_PEER:
337 to = (struct sockaddr *) ptr;
339 memcpy(&(data->peer), to, sizeof(struct sockaddr));
341 case BIO_CTRL_DGRAM_SET_RECV_TIMEOUT:
342 if ( setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, ptr,
343 sizeof(struct timeval)) < 0)
344 { perror("setsockopt"); ret = -1; }
346 case BIO_CTRL_DGRAM_GET_RECV_TIMEOUT:
347 if ( getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
348 ptr, (socklen_t *)&ret) < 0)
349 { perror("getsockopt"); ret = -1; }
351 case BIO_CTRL_DGRAM_SET_SEND_TIMEOUT:
352 if ( setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO, ptr,
353 sizeof(struct timeval)) < 0)
354 { perror("setsockopt"); ret = -1; }
356 case BIO_CTRL_DGRAM_GET_SEND_TIMEOUT:
357 if ( getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
358 ptr, (socklen_t *)&ret) < 0)
359 { perror("getsockopt"); ret = -1; }
361 case BIO_CTRL_DGRAM_GET_SEND_TIMER_EXP:
363 case BIO_CTRL_DGRAM_GET_RECV_TIMER_EXP:
364 if ( data->_errno == EAGAIN)
372 case BIO_CTRL_DGRAM_MTU_EXCEEDED:
373 if ( data->_errno == EMSGSIZE)
388 static int dgram_puts(BIO *bp, const char *str)
393 ret=dgram_write(bp,str,n);
397 int BIO_dgram_should_retry(int i)
401 if ((i == 0) || (i == -1))
403 err=get_last_socket_error();
405 #if defined(OPENSSL_SYS_WINDOWS) && 0 /* more microsoft stupidity? perhaps not? Ben 4/1/99 */
406 if ((i == -1) && (err == 0))
410 return(BIO_dgram_non_fatal_error(err));
415 int BIO_dgram_non_fatal_error(int err)
419 #if defined(OPENSSL_SYS_WINDOWS)
420 # if defined(WSAEWOULDBLOCK)
424 # if 0 /* This appears to always be an error */
425 # if defined(WSAENOTCONN)
432 # ifdef WSAEWOULDBLOCK
433 # if WSAEWOULDBLOCK != EWOULDBLOCK
441 #if defined(ENOTCONN)
450 #if EWOULDBLOCK != EAGAIN
467 /* DF bit set, and packet larger than MTU */