bss_dgram.c revision 194206 
1/* crypto/bio/bio_dgram.c */
2/*
3 * DTLS implementation written by Nagendra Modadugu
4 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
5 */
6/* ====================================================================
7 * Copyright (c) 1999-2005 The OpenSSL Project.  All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 *
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
19 *    distribution.
20 *
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/)"
25 *
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.
30 *
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.
34 *
35 * 6. Redistributions of any form whatsoever must retain the following
36 *    acknowledgment:
37 *    "This product includes software developed by the OpenSSL Project
38 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 *
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 * ====================================================================
53 *
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).
57 *
58 */
59
60#ifndef OPENSSL_NO_DGRAM
61
62#include <stdio.h>
63#include <errno.h>
64#define USE_SOCKETS
65#include "cryptlib.h"
66
67#include <openssl/bio.h>
68
69#define IP_MTU      14 /* linux is lame */
70
71#ifdef WATT32
72#define sock_write SockWrite  /* Watt-32 uses same names */
73#define sock_read  SockRead
74#define sock_puts  SockPuts
75#endif
76
77static int dgram_write(BIO *h, const char *buf, int num);
78static int dgram_read(BIO *h, char *buf, int size);
79static int dgram_puts(BIO *h, const char *str);
80static long dgram_ctrl(BIO *h, int cmd, long arg1, void *arg2);
81static int dgram_new(BIO *h);
82static int dgram_free(BIO *data);
83static int dgram_clear(BIO *bio);
84
85static int BIO_dgram_should_retry(int s);
86
87static BIO_METHOD methods_dgramp=
88	{
89	BIO_TYPE_DGRAM,
90	"datagram socket",
91	dgram_write,
92	dgram_read,
93	dgram_puts,
94	NULL, /* dgram_gets, */
95	dgram_ctrl,
96	dgram_new,
97	dgram_free,
98	NULL,
99	};
100
101typedef struct bio_dgram_data_st
102	{
103	struct sockaddr peer;
104	unsigned int connected;
105	unsigned int _errno;
106	unsigned int mtu;
107	} bio_dgram_data;
108
109BIO_METHOD *BIO_s_datagram(void)
110	{
111	return(&methods_dgramp);
112	}
113
114BIO *BIO_new_dgram(int fd, int close_flag)
115	{
116	BIO *ret;
117
118	ret=BIO_new(BIO_s_datagram());
119	if (ret == NULL) return(NULL);
120	BIO_set_fd(ret,fd,close_flag);
121	return(ret);
122	}
123
124static int dgram_new(BIO *bi)
125	{
126	bio_dgram_data *data = NULL;
127
128	bi->init=0;
129	bi->num=0;
130	data = OPENSSL_malloc(sizeof(bio_dgram_data));
131	if (data == NULL)
132		return 0;
133	memset(data, 0x00, sizeof(bio_dgram_data));
134    bi->ptr = data;
135
136	bi->flags=0;
137	return(1);
138	}
139
140static int dgram_free(BIO *a)
141	{
142	bio_dgram_data *data;
143
144	if (a == NULL) return(0);
145	if ( ! dgram_clear(a))
146		return 0;
147
148	data = (bio_dgram_data *)a->ptr;
149	if(data != NULL) OPENSSL_free(data);
150
151	return(1);
152	}
153
154static int dgram_clear(BIO *a)
155	{
156	if (a == NULL) return(0);
157	if (a->shutdown)
158		{
159		if (a->init)
160			{
161			SHUTDOWN2(a->num);
162			}
163		a->init=0;
164		a->flags=0;
165		}
166	return(1);
167	}
168
169static int dgram_read(BIO *b, char *out, int outl)
170	{
171	int ret=0;
172	bio_dgram_data *data = (bio_dgram_data *)b->ptr;
173
174	struct sockaddr peer;
175	int peerlen = sizeof(peer);
176
177	if (out != NULL)
178		{
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
184		 * compiler warnings.
185		 */
186		ret=recvfrom(b->num,out,outl,0,&peer,(void *)&peerlen);
187
188		if ( ! data->connected  && ret > 0)
189			BIO_ctrl(b, BIO_CTRL_DGRAM_CONNECT, 0, &peer);
190
191		BIO_clear_retry_flags(b);
192		if (ret <= 0)
193			{
194			if (BIO_dgram_should_retry(ret))
195				{
196				BIO_set_retry_read(b);
197				data->_errno = get_last_socket_error();
198				}
199			}
200		}
201	return(ret);
202	}
203
204static int dgram_write(BIO *b, const char *in, int inl)
205	{
206	int ret;
207	bio_dgram_data *data = (bio_dgram_data *)b->ptr;
208	clear_socket_error();
209
210    if ( data->connected )
211        ret=writesocket(b->num,in,inl);
212    else
213#if defined(NETWARE_CLIB) && defined(NETWARE_BSDSOCK)
214        ret=sendto(b->num, (char *)in, inl, 0, &data->peer, sizeof(data->peer));
215#else
216        ret=sendto(b->num, in, inl, 0, &data->peer, sizeof(data->peer));
217#endif
218
219	BIO_clear_retry_flags(b);
220	if (ret <= 0)
221		{
222		if (BIO_sock_should_retry(ret))
223			{
224			BIO_set_retry_write(b);
225			data->_errno = get_last_socket_error();
226
227#if 0 /* higher layers are responsible for querying MTU, if necessary */
228			if ( data->_errno == EMSGSIZE)
229				/* retrieve the new MTU */
230				BIO_ctrl(b, BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
231#endif
232			}
233		}
234	return(ret);
235	}
236
237static long dgram_ctrl(BIO *b, int cmd, long num, void *ptr)
238	{
239	long ret=1;
240	int *ip;
241	struct sockaddr *to = NULL;
242	bio_dgram_data *data = NULL;
243	long sockopt_val = 0;
244	unsigned int sockopt_len = 0;
245
246	data = (bio_dgram_data *)b->ptr;
247
248	switch (cmd)
249		{
250	case BIO_CTRL_RESET:
251		num=0;
252	case BIO_C_FILE_SEEK:
253		ret=0;
254		break;
255	case BIO_C_FILE_TELL:
256	case BIO_CTRL_INFO:
257		ret=0;
258		break;
259	case BIO_C_SET_FD:
260		dgram_clear(b);
261		b->num= *((int *)ptr);
262		b->shutdown=(int)num;
263		b->init=1;
264		break;
265	case BIO_C_GET_FD:
266		if (b->init)
267			{
268			ip=(int *)ptr;
269			if (ip != NULL) *ip=b->num;
270			ret=b->num;
271			}
272		else
273			ret= -1;
274		break;
275	case BIO_CTRL_GET_CLOSE:
276		ret=b->shutdown;
277		break;
278	case BIO_CTRL_SET_CLOSE:
279		b->shutdown=(int)num;
280		break;
281	case BIO_CTRL_PENDING:
282	case BIO_CTRL_WPENDING:
283		ret=0;
284		break;
285	case BIO_CTRL_DUP:
286	case BIO_CTRL_FLUSH:
287		ret=1;
288		break;
289	case BIO_CTRL_DGRAM_CONNECT:
290		to = (struct sockaddr *)ptr;
291#if 0
292		if (connect(b->num, to, sizeof(struct sockaddr)) < 0)
293			{ perror("connect"); ret = 0; }
294		else
295			{
296#endif
297			memcpy(&(data->peer),to, sizeof(struct sockaddr));
298#if 0
299			}
300#endif
301		break;
302		/* (Linux)kernel sets DF bit on outgoing IP packets */
303#ifdef IP_MTU_DISCOVER
304	case BIO_CTRL_DGRAM_MTU_DISCOVER:
305		sockopt_val = IP_PMTUDISC_DO;
306		if ((ret = setsockopt(b->num, IPPROTO_IP, IP_MTU_DISCOVER,
307			&sockopt_val, sizeof(sockopt_val))) < 0)
308			perror("setsockopt");
309		break;
310#endif
311	case BIO_CTRL_DGRAM_QUERY_MTU:
312         sockopt_len = sizeof(sockopt_val);
313		if ((ret = getsockopt(b->num, IPPROTO_IP, IP_MTU, (void *)&sockopt_val,
314			&sockopt_len)) < 0 || sockopt_val < 0)
315			{ ret = 0; }
316		else
317			{
318			data->mtu = sockopt_val;
319			ret = data->mtu;
320			}
321		break;
322	case BIO_CTRL_DGRAM_GET_MTU:
323		return data->mtu;
324		break;
325	case BIO_CTRL_DGRAM_SET_MTU:
326		data->mtu = num;
327		ret = num;
328		break;
329	case BIO_CTRL_DGRAM_SET_CONNECTED:
330		to = (struct sockaddr *)ptr;
331
332		if ( to != NULL)
333			{
334			data->connected = 1;
335			memcpy(&(data->peer),to, sizeof(struct sockaddr));
336			}
337		else
338			{
339			data->connected = 0;
340			memset(&(data->peer), 0x00, sizeof(struct sockaddr));
341			}
342		break;
343    case BIO_CTRL_DGRAM_SET_PEER:
344        to = (struct sockaddr *) ptr;
345
346        memcpy(&(data->peer), to, sizeof(struct sockaddr));
347        break;
348#if defined(SO_RCVTIMEO)
349	case BIO_CTRL_DGRAM_SET_RECV_TIMEOUT:
350#ifdef OPENSSL_SYS_WINDOWS
351		{
352		struct timeval *tv = (struct timeval *)ptr;
353		int timeout = tv->tv_sec * 1000 + tv->tv_usec/1000;
354		if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
355			(void*)&timeout, sizeof(timeout)) < 0)
356			{ perror("setsockopt"); ret = -1; }
357		}
358#else
359		if ( setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, ptr,
360			sizeof(struct timeval)) < 0)
361			{ perror("setsockopt");	ret = -1; }
362#endif
363		break;
364	case BIO_CTRL_DGRAM_GET_RECV_TIMEOUT:
365#ifdef OPENSSL_SYS_WINDOWS
366		{
367		int timeout, sz = sizeof(timeout);
368		struct timeval *tv = (struct timeval *)ptr;
369		if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
370			(void*)&timeout, &sz) < 0)
371			{ perror("getsockopt"); ret = -1; }
372		else
373			{
374			tv->tv_sec = timeout / 1000;
375			tv->tv_usec = (timeout % 1000) * 1000;
376			ret = sizeof(*tv);
377			}
378		}
379#else
380		if ( getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
381			ptr, (void *)&ret) < 0)
382			{ perror("getsockopt"); ret = -1; }
383#endif
384		break;
385#endif
386#if defined(SO_SNDTIMEO)
387	case BIO_CTRL_DGRAM_SET_SEND_TIMEOUT:
388#ifdef OPENSSL_SYS_WINDOWS
389		{
390		struct timeval *tv = (struct timeval *)ptr;
391		int timeout = tv->tv_sec * 1000 + tv->tv_usec/1000;
392		if (setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
393			(void*)&timeout, sizeof(timeout)) < 0)
394			{ perror("setsockopt"); ret = -1; }
395		}
396#else
397		if ( setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO, ptr,
398			sizeof(struct timeval)) < 0)
399			{ perror("setsockopt");	ret = -1; }
400#endif
401		break;
402	case BIO_CTRL_DGRAM_GET_SEND_TIMEOUT:
403#ifdef OPENSSL_SYS_WINDOWS
404		{
405		int timeout, sz = sizeof(timeout);
406		struct timeval *tv = (struct timeval *)ptr;
407		if (getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
408			(void*)&timeout, &sz) < 0)
409			{ perror("getsockopt"); ret = -1; }
410		else
411			{
412			tv->tv_sec = timeout / 1000;
413			tv->tv_usec = (timeout % 1000) * 1000;
414			ret = sizeof(*tv);
415			}
416		}
417#else
418		if ( getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
419			ptr, (void *)&ret) < 0)
420			{ perror("getsockopt"); ret = -1; }
421#endif
422		break;
423#endif
424	case BIO_CTRL_DGRAM_GET_SEND_TIMER_EXP:
425		/* fall-through */
426	case BIO_CTRL_DGRAM_GET_RECV_TIMER_EXP:
427#ifdef OPENSSL_SYS_WINDOWS
428		if ( data->_errno == WSAETIMEDOUT)
429#else
430		if ( data->_errno == EAGAIN)
431#endif
432			{
433			ret = 1;
434			data->_errno = 0;
435			}
436		else
437			ret = 0;
438		break;
439#ifdef EMSGSIZE
440	case BIO_CTRL_DGRAM_MTU_EXCEEDED:
441		if ( data->_errno == EMSGSIZE)
442			{
443			ret = 1;
444			data->_errno = 0;
445			}
446		else
447			ret = 0;
448		break;
449#endif
450	default:
451		ret=0;
452		break;
453		}
454	return(ret);
455	}
456
457static int dgram_puts(BIO *bp, const char *str)
458	{
459	int n,ret;
460
461	n=strlen(str);
462	ret=dgram_write(bp,str,n);
463	return(ret);
464	}
465
466static int BIO_dgram_should_retry(int i)
467	{
468	int err;
469
470	if ((i == 0) || (i == -1))
471		{
472		err=get_last_socket_error();
473
474#if defined(OPENSSL_SYS_WINDOWS) && 0 /* more microsoft stupidity? perhaps not? Ben 4/1/99 */
475		if ((i == -1) && (err == 0))
476			return(1);
477#endif
478
479		return(BIO_dgram_non_fatal_error(err));
480		}
481	return(0);
482	}
483
484int BIO_dgram_non_fatal_error(int err)
485	{
486	switch (err)
487		{
488#if defined(OPENSSL_SYS_WINDOWS)
489# if defined(WSAEWOULDBLOCK)
490	case WSAEWOULDBLOCK:
491# endif
492
493# if 0 /* This appears to always be an error */
494#  if defined(WSAENOTCONN)
495	case WSAENOTCONN:
496#  endif
497# endif
498#endif
499
500#ifdef EWOULDBLOCK
501# ifdef WSAEWOULDBLOCK
502#  if WSAEWOULDBLOCK != EWOULDBLOCK
503	case EWOULDBLOCK:
504#  endif
505# else
506	case EWOULDBLOCK:
507# endif
508#endif
509
510#if defined(ENOTCONN)
511	case ENOTCONN:
512#endif
513
514#ifdef EINTR
515	case EINTR:
516#endif
517
518#ifdef EAGAIN
519#if EWOULDBLOCK != EAGAIN
520	case EAGAIN:
521# endif
522#endif
523
524#ifdef EPROTO
525	case EPROTO:
526#endif
527
528#ifdef EINPROGRESS
529	case EINPROGRESS:
530#endif
531
532#ifdef EALREADY
533	case EALREADY:
534#endif
535
536/* DF bit set, and packet larger than MTU */
537#ifdef EMSGSIZE
538	case EMSGSIZE:
539#endif
540
541		return(1);
542		/* break; */
543	default:
544		break;
545		}
546	return(0);
547	}
548#endif
549