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 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 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; }
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; }
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; }
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; }
364 case BIO_CTRL_DGRAM_GET_SEND_TIMER_EXP
:
366 case BIO_CTRL_DGRAM_GET_RECV_TIMER_EXP
:
367 if ( data
->_errno
== EAGAIN
)
376 case BIO_CTRL_DGRAM_MTU_EXCEEDED
:
377 if ( data
->_errno
== EMSGSIZE
)
393 static int dgram_puts(BIO
*bp
, const char *str
)
398 ret
=dgram_write(bp
,str
,n
);
402 int BIO_dgram_should_retry(int i
)
406 if ((i
== 0) || (i
== -1))
408 err
=get_last_socket_error();
410 #if defined(OPENSSL_SYS_WINDOWS) && 0 /* more microsoft stupidity? perhaps not? Ben 4/1/99 */
411 if ((i
== -1) && (err
== 0))
415 return(BIO_dgram_non_fatal_error(err
));
420 int BIO_dgram_non_fatal_error(int err
)
424 #if defined(OPENSSL_SYS_WINDOWS)
425 # if defined(WSAEWOULDBLOCK)
429 # if 0 /* This appears to always be an error */
430 # if defined(WSAENOTCONN)
437 # ifdef WSAEWOULDBLOCK
438 # if WSAEWOULDBLOCK != EWOULDBLOCK
446 #if defined(ENOTCONN)
455 #if EWOULDBLOCK != EAGAIN
472 /* DF bit set, and packet larger than MTU */