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 #define IP_MTU 14 /* linux is lame */
72 #define sock_write SockWrite /* Watt-32 uses same names */
73 #define sock_read SockRead
74 #define sock_puts SockPuts
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);
85 static int BIO_dgram_should_retry(int s);
87 static BIO_METHOD methods_dgramp=
94 NULL, /* dgram_gets, */
101 typedef struct bio_dgram_data_st
103 struct sockaddr peer;
104 unsigned int connected;
109 BIO_METHOD *BIO_s_datagram(void)
111 return(&methods_dgramp);
114 BIO *BIO_new_dgram(int fd, int close_flag)
118 ret=BIO_new(BIO_s_datagram());
119 if (ret == NULL) return(NULL);
120 BIO_set_fd(ret,fd,close_flag);
124 static int dgram_new(BIO *bi)
126 bio_dgram_data *data = NULL;
130 data = OPENSSL_malloc(sizeof(bio_dgram_data));
133 memset(data, 0x00, sizeof(bio_dgram_data));
140 static int dgram_free(BIO *a)
142 bio_dgram_data *data;
144 if (a == NULL) return(0);
145 if ( ! dgram_clear(a))
148 data = (bio_dgram_data *)a->ptr;
149 if(data != NULL) OPENSSL_free(data);
154 static int dgram_clear(BIO *a)
156 if (a == NULL) return(0);
169 static int dgram_read(BIO *b, char *out, int outl)
172 bio_dgram_data *data = (bio_dgram_data *)b->ptr;
174 struct sockaddr peer;
175 int peerlen = sizeof(peer);
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
186 ret=recvfrom(b->num,out,outl,0,&peer,(void *)&peerlen);
188 if ( ! data->connected && ret > 0)
189 BIO_ctrl(b, BIO_CTRL_DGRAM_CONNECT, 0, &peer);
191 BIO_clear_retry_flags(b);
194 if (BIO_dgram_should_retry(ret))
196 BIO_set_retry_read(b);
197 data->_errno = get_last_socket_error();
204 static int dgram_write(BIO *b, const char *in, int inl)
207 bio_dgram_data *data = (bio_dgram_data *)b->ptr;
208 clear_socket_error();
210 if ( data->connected )
211 ret=send(b->num,in,inl,0);
213 ret=sendto(b->num, in, inl, 0, &data->peer, sizeof(data->peer));
215 BIO_clear_retry_flags(b);
218 if (BIO_sock_should_retry(ret))
220 BIO_set_retry_write(b);
221 data->_errno = get_last_socket_error();
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);
233 static long dgram_ctrl(BIO *b, int cmd, long num, void *ptr)
237 struct sockaddr *to = NULL;
238 bio_dgram_data *data = NULL;
239 long sockopt_val = 0;
240 unsigned int sockopt_len = 0;
242 data = (bio_dgram_data *)b->ptr;
248 case BIO_C_FILE_SEEK:
251 case BIO_C_FILE_TELL:
257 b->num= *((int *)ptr);
258 b->shutdown=(int)num;
265 if (ip != NULL) *ip=b->num;
271 case BIO_CTRL_GET_CLOSE:
274 case BIO_CTRL_SET_CLOSE:
275 b->shutdown=(int)num;
277 case BIO_CTRL_PENDING:
278 case BIO_CTRL_WPENDING:
285 case BIO_CTRL_DGRAM_CONNECT:
286 to = (struct sockaddr *)ptr;
288 if (connect(b->num, to, sizeof(struct sockaddr)) < 0)
289 { perror("connect"); ret = 0; }
293 memcpy(&(data->peer),to, sizeof(struct sockaddr));
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");
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)
314 data->mtu = sockopt_val;
318 case BIO_CTRL_DGRAM_GET_MTU:
321 case BIO_CTRL_DGRAM_SET_MTU:
325 case BIO_CTRL_DGRAM_SET_CONNECTED:
326 to = (struct sockaddr *)ptr;
331 memcpy(&(data->peer),to, sizeof(struct sockaddr));
336 memset(&(data->peer), 0x00, sizeof(struct sockaddr));
339 case BIO_CTRL_DGRAM_SET_PEER:
340 to = (struct sockaddr *) ptr;
342 memcpy(&(data->peer), to, sizeof(struct sockaddr));
344 #if defined(SO_RCVTIMEO)
345 case BIO_CTRL_DGRAM_SET_RECV_TIMEOUT:
346 if ( setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, ptr,
347 sizeof(struct timeval)) < 0)
348 { perror("setsockopt"); ret = -1; }
350 case BIO_CTRL_DGRAM_GET_RECV_TIMEOUT:
351 if ( getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
352 ptr, (void *)&ret) < 0)
353 { perror("getsockopt"); ret = -1; }
356 #if defined(SO_SNDTIMEO)
357 case BIO_CTRL_DGRAM_SET_SEND_TIMEOUT:
358 if ( setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO, ptr,
359 sizeof(struct timeval)) < 0)
360 { perror("setsockopt"); ret = -1; }
362 case BIO_CTRL_DGRAM_GET_SEND_TIMEOUT:
363 if ( getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
364 ptr, (void *)&ret) < 0)
365 { perror("getsockopt"); ret = -1; }
368 case BIO_CTRL_DGRAM_GET_SEND_TIMER_EXP:
370 case BIO_CTRL_DGRAM_GET_RECV_TIMER_EXP:
371 if ( data->_errno == EAGAIN)
380 case BIO_CTRL_DGRAM_MTU_EXCEEDED:
381 if ( data->_errno == EMSGSIZE)
397 static int dgram_puts(BIO *bp, const char *str)
402 ret=dgram_write(bp,str,n);
406 static int BIO_dgram_should_retry(int i)
410 if ((i == 0) || (i == -1))
412 err=get_last_socket_error();
414 #if defined(OPENSSL_SYS_WINDOWS) && 0 /* more microsoft stupidity? perhaps not? Ben 4/1/99 */
415 if ((i == -1) && (err == 0))
419 return(BIO_dgram_non_fatal_error(err));
424 int BIO_dgram_non_fatal_error(int err)
428 #if defined(OPENSSL_SYS_WINDOWS)
429 # if defined(WSAEWOULDBLOCK)
433 # if 0 /* This appears to always be an error */
434 # if defined(WSAENOTCONN)
441 # ifdef WSAEWOULDBLOCK
442 # if WSAEWOULDBLOCK != EWOULDBLOCK
450 #if defined(ENOTCONN)
459 #if EWOULDBLOCK != EAGAIN
476 /* DF bit set, and packet larger than MTU */