bss_acpt.c revision 43c12e3d4f9bbbbd4a8ba7b149686437514bc6b6 
1/* crypto/bio/bss_acpt.c */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to.  The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 *    notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 *    notice, this list of conditions and the following disclaimer in the
30 *    documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 *    must display the following acknowledgement:
33 *    "This product includes cryptographic software written by
34 *     Eric Young (eay@cryptsoft.com)"
35 *    The word 'cryptographic' can be left out if the rouines from the library
36 *    being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 *    the apps directory (application code) you must include an acknowledgement:
39 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed.  i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59#include <stdio.h>
60#include <errno.h>
61#define USE_SOCKETS
62#include "cryptlib.h"
63#include <openssl/bio.h>
64
65#ifndef OPENSSL_NO_SOCK
66
67#ifdef OPENSSL_SYS_WIN16
68#define SOCKET_PROTOCOL 0 /* more microsoft stupidity */
69#else
70#define SOCKET_PROTOCOL IPPROTO_TCP
71#endif
72
73#if (defined(OPENSSL_SYS_VMS) && __VMS_VER < 70000000)
74/* FIONBIO used as a switch to enable ioctl, and that isn't in VMS < 7.0 */
75#undef FIONBIO
76#endif
77
78typedef struct bio_accept_st
79	{
80	int state;
81	char *param_addr;
82
83	int accept_sock;
84	int accept_nbio;
85
86	char *addr;
87	int nbio;
88	/* If 0, it means normal, if 1, do a connect on bind failure,
89	 * and if there is no-one listening, bind with SO_REUSEADDR.
90	 * If 2, always use SO_REUSEADDR. */
91	int bind_mode;
92	BIO *bio_chain;
93	} BIO_ACCEPT;
94
95static int acpt_write(BIO *h, const char *buf, int num);
96static int acpt_read(BIO *h, char *buf, int size);
97static int acpt_puts(BIO *h, const char *str);
98static long acpt_ctrl(BIO *h, int cmd, long arg1, void *arg2);
99static int acpt_new(BIO *h);
100static int acpt_free(BIO *data);
101static int acpt_state(BIO *b, BIO_ACCEPT *c);
102static void acpt_close_socket(BIO *data);
103static BIO_ACCEPT *BIO_ACCEPT_new(void );
104static void BIO_ACCEPT_free(BIO_ACCEPT *a);
105
106#define ACPT_S_BEFORE			1
107#define ACPT_S_GET_ACCEPT_SOCKET	2
108#define ACPT_S_OK			3
109
110static BIO_METHOD methods_acceptp=
111	{
112	BIO_TYPE_ACCEPT,
113	"socket accept",
114	acpt_write,
115	acpt_read,
116	acpt_puts,
117	NULL, /* connect_gets, */
118	acpt_ctrl,
119	acpt_new,
120	acpt_free,
121	NULL,
122	};
123
124BIO_METHOD *BIO_s_accept(void)
125	{
126	return(&methods_acceptp);
127	}
128
129static int acpt_new(BIO *bi)
130	{
131	BIO_ACCEPT *ba;
132
133	bi->init=0;
134	bi->num=INVALID_SOCKET;
135	bi->flags=0;
136	if ((ba=BIO_ACCEPT_new()) == NULL)
137		return(0);
138	bi->ptr=(char *)ba;
139	ba->state=ACPT_S_BEFORE;
140	bi->shutdown=1;
141	return(1);
142	}
143
144static BIO_ACCEPT *BIO_ACCEPT_new(void)
145	{
146	BIO_ACCEPT *ret;
147
148	if ((ret=(BIO_ACCEPT *)OPENSSL_malloc(sizeof(BIO_ACCEPT))) == NULL)
149		return(NULL);
150
151	memset(ret,0,sizeof(BIO_ACCEPT));
152	ret->accept_sock=INVALID_SOCKET;
153	ret->bind_mode=BIO_BIND_NORMAL;
154	return(ret);
155	}
156
157static void BIO_ACCEPT_free(BIO_ACCEPT *a)
158	{
159	if(a == NULL)
160	    return;
161
162	if (a->param_addr != NULL) OPENSSL_free(a->param_addr);
163	if (a->addr != NULL) OPENSSL_free(a->addr);
164	if (a->bio_chain != NULL) BIO_free(a->bio_chain);
165	OPENSSL_free(a);
166	}
167
168static void acpt_close_socket(BIO *bio)
169	{
170	BIO_ACCEPT *c;
171
172	c=(BIO_ACCEPT *)bio->ptr;
173	if (c->accept_sock != INVALID_SOCKET)
174		{
175		shutdown(c->accept_sock,2);
176		closesocket(c->accept_sock);
177		c->accept_sock=INVALID_SOCKET;
178		bio->num=INVALID_SOCKET;
179		}
180	}
181
182static int acpt_free(BIO *a)
183	{
184	BIO_ACCEPT *data;
185
186	if (a == NULL) return(0);
187	data=(BIO_ACCEPT *)a->ptr;
188
189	if (a->shutdown)
190		{
191		acpt_close_socket(a);
192		BIO_ACCEPT_free(data);
193		a->ptr=NULL;
194		a->flags=0;
195		a->init=0;
196		}
197	return(1);
198	}
199
200static int acpt_state(BIO *b, BIO_ACCEPT *c)
201	{
202	BIO *bio=NULL,*dbio;
203	int s= -1;
204	int i;
205
206again:
207	switch (c->state)
208		{
209	case ACPT_S_BEFORE:
210		if (c->param_addr == NULL)
211			{
212			BIOerr(BIO_F_ACPT_STATE,BIO_R_NO_ACCEPT_PORT_SPECIFIED);
213			return(-1);
214			}
215		s=BIO_get_accept_socket(c->param_addr,c->bind_mode);
216		if (s == INVALID_SOCKET)
217			return(-1);
218
219		if (c->accept_nbio)
220			{
221			if (!BIO_socket_nbio(s,1))
222				{
223				closesocket(s);
224				BIOerr(BIO_F_ACPT_STATE,BIO_R_ERROR_SETTING_NBIO_ON_ACCEPT_SOCKET);
225				return(-1);
226				}
227			}
228		c->accept_sock=s;
229		b->num=s;
230		c->state=ACPT_S_GET_ACCEPT_SOCKET;
231		return(1);
232		/* break; */
233	case ACPT_S_GET_ACCEPT_SOCKET:
234		if (b->next_bio != NULL)
235			{
236			c->state=ACPT_S_OK;
237			goto again;
238			}
239		BIO_clear_retry_flags(b);
240		b->retry_reason=0;
241		i=BIO_accept(c->accept_sock,&(c->addr));
242
243		/* -2 return means we should retry */
244		if(i == -2)
245			{
246			BIO_set_retry_special(b);
247			b->retry_reason=BIO_RR_ACCEPT;
248			return -1;
249			}
250
251		if (i < 0) return(i);
252
253		bio=BIO_new_socket(i,BIO_CLOSE);
254		if (bio == NULL) goto err;
255
256		BIO_set_callback(bio,BIO_get_callback(b));
257		BIO_set_callback_arg(bio,BIO_get_callback_arg(b));
258
259		if (c->nbio)
260			{
261			if (!BIO_socket_nbio(i,1))
262				{
263				BIOerr(BIO_F_ACPT_STATE,BIO_R_ERROR_SETTING_NBIO_ON_ACCEPTED_SOCKET);
264				goto err;
265				}
266			}
267
268		/* If the accept BIO has an bio_chain, we dup it and
269		 * put the new socket at the end. */
270		if (c->bio_chain != NULL)
271			{
272			if ((dbio=BIO_dup_chain(c->bio_chain)) == NULL)
273				goto err;
274			if (!BIO_push(dbio,bio)) goto err;
275			bio=dbio;
276			}
277		if (BIO_push(b,bio) == NULL) goto err;
278
279		c->state=ACPT_S_OK;
280		return(1);
281err:
282		if (bio != NULL)
283			BIO_free(bio);
284		else if (s >= 0)
285			closesocket(s);
286		return(0);
287		/* break; */
288	case ACPT_S_OK:
289		if (b->next_bio == NULL)
290			{
291			c->state=ACPT_S_GET_ACCEPT_SOCKET;
292			goto again;
293			}
294		return(1);
295		/* break; */
296	default:
297		return(0);
298		/* break; */
299		}
300
301	}
302
303static int acpt_read(BIO *b, char *out, int outl)
304	{
305	int ret=0;
306	BIO_ACCEPT *data;
307
308	BIO_clear_retry_flags(b);
309	data=(BIO_ACCEPT *)b->ptr;
310
311	while (b->next_bio == NULL)
312		{
313		ret=acpt_state(b,data);
314		if (ret <= 0) return(ret);
315		}
316
317	ret=BIO_read(b->next_bio,out,outl);
318	BIO_copy_next_retry(b);
319	return(ret);
320	}
321
322static int acpt_write(BIO *b, const char *in, int inl)
323	{
324	int ret;
325	BIO_ACCEPT *data;
326
327	BIO_clear_retry_flags(b);
328	data=(BIO_ACCEPT *)b->ptr;
329
330	while (b->next_bio == NULL)
331		{
332		ret=acpt_state(b,data);
333		if (ret <= 0) return(ret);
334		}
335
336	ret=BIO_write(b->next_bio,in,inl);
337	BIO_copy_next_retry(b);
338	return(ret);
339	}
340
341static long acpt_ctrl(BIO *b, int cmd, long num, void *ptr)
342	{
343	int *ip;
344	long ret=1;
345	BIO_ACCEPT *data;
346	char **pp;
347
348	data=(BIO_ACCEPT *)b->ptr;
349
350	switch (cmd)
351		{
352	case BIO_CTRL_RESET:
353		ret=0;
354		data->state=ACPT_S_BEFORE;
355		acpt_close_socket(b);
356		b->flags=0;
357		break;
358	case BIO_C_DO_STATE_MACHINE:
359		/* use this one to start the connection */
360		ret=(long)acpt_state(b,data);
361		break;
362	case BIO_C_SET_ACCEPT:
363		if (ptr != NULL)
364			{
365			if (num == 0)
366				{
367				b->init=1;
368				if (data->param_addr != NULL)
369					OPENSSL_free(data->param_addr);
370				data->param_addr=BUF_strdup(ptr);
371				}
372			else if (num == 1)
373				{
374				data->accept_nbio=(ptr != NULL);
375				}
376			else if (num == 2)
377				{
378				if (data->bio_chain != NULL)
379					BIO_free(data->bio_chain);
380				data->bio_chain=(BIO *)ptr;
381				}
382			}
383		break;
384	case BIO_C_SET_NBIO:
385		data->nbio=(int)num;
386		break;
387	case BIO_C_SET_FD:
388		b->init=1;
389		b->num= *((int *)ptr);
390		data->accept_sock=b->num;
391		data->state=ACPT_S_GET_ACCEPT_SOCKET;
392		b->shutdown=(int)num;
393		b->init=1;
394		break;
395	case BIO_C_GET_FD:
396		if (b->init)
397			{
398			ip=(int *)ptr;
399			if (ip != NULL)
400				*ip=data->accept_sock;
401			ret=data->accept_sock;
402			}
403		else
404			ret= -1;
405		break;
406	case BIO_C_GET_ACCEPT:
407		if (b->init)
408			{
409			if (ptr != NULL)
410				{
411				pp=(char **)ptr;
412				*pp=data->param_addr;
413				}
414			else
415				ret= -1;
416			}
417		else
418			ret= -1;
419		break;
420	case BIO_CTRL_GET_CLOSE:
421		ret=b->shutdown;
422		break;
423	case BIO_CTRL_SET_CLOSE:
424		b->shutdown=(int)num;
425		break;
426	case BIO_CTRL_PENDING:
427	case BIO_CTRL_WPENDING:
428		ret=0;
429		break;
430	case BIO_CTRL_FLUSH:
431		break;
432	case BIO_C_SET_BIND_MODE:
433		data->bind_mode=(int)num;
434		break;
435	case BIO_C_GET_BIND_MODE:
436		ret=(long)data->bind_mode;
437		break;
438	case BIO_CTRL_DUP:
439/*		dbio=(BIO *)ptr;
440		if (data->param_port) EAY EAY
441			BIO_set_port(dbio,data->param_port);
442		if (data->param_hostname)
443			BIO_set_hostname(dbio,data->param_hostname);
444		BIO_set_nbio(dbio,data->nbio); */
445		break;
446
447	default:
448		ret=0;
449		break;
450		}
451	return(ret);
452	}
453
454static int acpt_puts(BIO *bp, const char *str)
455	{
456	int n,ret;
457
458	n=strlen(str);
459	ret=acpt_write(bp,str,n);
460	return(ret);
461	}
462
463BIO *BIO_new_accept(char *str)
464	{
465	BIO *ret;
466
467	ret=BIO_new(BIO_s_accept());
468	if (ret == NULL) return(NULL);
469	if (BIO_set_accept_port(ret,str))
470		return(ret);
471	else
472		{
473		BIO_free(ret);
474		return(NULL);
475		}
476	}
477
478#endif
479