bss_conn.c revision 55714 
1/* crypto/bio/bss_conn.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#ifndef NO_SOCK
60
61#include <stdio.h>
62#include <errno.h>
63#define USE_SOCKETS
64#include "cryptlib.h"
65#include <openssl/bio.h>
66
67#ifdef WIN16
68#define SOCKET_PROTOCOL 0 /* more microsoft stupidity */
69#else
70#define SOCKET_PROTOCOL IPPROTO_TCP
71#endif
72
73#if (defined(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
78
79typedef struct bio_connect_st
80	{
81	int state;
82
83	char *param_hostname;
84	char *param_port;
85	int nbio;
86
87	unsigned char ip[4];
88	unsigned short port;
89
90	struct sockaddr_in them;
91
92	/* int socket; this will be kept in bio->num so that it is
93	 * compatable with the bss_sock bio */
94
95	/* called when the connection is initially made
96	 *  callback(BIO,state,ret);  The callback should return
97	 * 'ret'.  state is for compatablity with the ssl info_callback */
98	int (*info_callback)();
99	} BIO_CONNECT;
100
101static int conn_write(BIO *h,char *buf,int num);
102static int conn_read(BIO *h,char *buf,int size);
103static int conn_puts(BIO *h,char *str);
104static long conn_ctrl(BIO *h,int cmd,long arg1,char *arg2);
105static int conn_new(BIO *h);
106static int conn_free(BIO *data);
107
108static int conn_state(BIO *b, BIO_CONNECT *c);
109static void conn_close_socket(BIO *data);
110BIO_CONNECT *BIO_CONNECT_new(void );
111void BIO_CONNECT_free(BIO_CONNECT *a);
112
113static BIO_METHOD methods_connectp=
114	{
115	BIO_TYPE_CONNECT,
116	"socket connect",
117	conn_write,
118	conn_read,
119	conn_puts,
120	NULL, /* connect_gets, */
121	conn_ctrl,
122	conn_new,
123	conn_free,
124	};
125
126static int conn_state(BIO *b, BIO_CONNECT *c)
127	{
128	int ret= -1,i;
129	unsigned long l;
130	char *p,*q;
131	int (*cb)()=NULL;
132
133	if (c->info_callback != NULL)
134		cb=c->info_callback;
135
136	for (;;)
137		{
138		switch (c->state)
139			{
140		case BIO_CONN_S_BEFORE:
141			p=c->param_hostname;
142			if (p == NULL)
143				{
144				BIOerr(BIO_F_CONN_STATE,BIO_R_NO_HOSTNAME_SPECIFIED);
145				goto exit_loop;
146				}
147			for ( ; *p != '\0'; p++)
148				{
149				if ((*p == ':') || (*p == '/')) break;
150				}
151
152			i= *p;
153			if ((i == ':') || (i == '/'))
154				{
155
156				*(p++)='\0';
157				if (i == ':')
158					{
159					for (q=p; *q; q++)
160						if (*q == '/')
161							{
162							*q='\0';
163							break;
164							}
165					if (c->param_port != NULL)
166						Free(c->param_port);
167					c->param_port=BUF_strdup(p);
168					}
169				}
170
171			if (c->param_port == NULL)
172				{
173				BIOerr(BIO_F_CONN_STATE,BIO_R_NO_PORT_SPECIFIED);
174				ERR_add_error_data(2,"host=",c->param_hostname);
175				goto exit_loop;
176				}
177			c->state=BIO_CONN_S_GET_IP;
178			break;
179
180		case BIO_CONN_S_GET_IP:
181			if (BIO_get_host_ip(c->param_hostname,&(c->ip[0])) <= 0)
182				goto exit_loop;
183			c->state=BIO_CONN_S_GET_PORT;
184			break;
185
186		case BIO_CONN_S_GET_PORT:
187			if (c->param_port == NULL)
188				{
189				abort();
190				goto exit_loop;
191				}
192			else if (BIO_get_port(c->param_port,&c->port) <= 0)
193				goto exit_loop;
194			c->state=BIO_CONN_S_CREATE_SOCKET;
195			break;
196
197		case BIO_CONN_S_CREATE_SOCKET:
198			/* now setup address */
199			memset((char *)&c->them,0,sizeof(c->them));
200			c->them.sin_family=AF_INET;
201			c->them.sin_port=htons((unsigned short)c->port);
202			l=(unsigned long)
203				((unsigned long)c->ip[0]<<24L)|
204				((unsigned long)c->ip[1]<<16L)|
205				((unsigned long)c->ip[2]<< 8L)|
206				((unsigned long)c->ip[3]);
207			c->them.sin_addr.s_addr=htonl(l);
208			c->state=BIO_CONN_S_CREATE_SOCKET;
209
210			ret=socket(AF_INET,SOCK_STREAM,SOCKET_PROTOCOL);
211			if (ret == INVALID_SOCKET)
212				{
213				SYSerr(SYS_F_SOCKET,get_last_socket_error());
214				ERR_add_error_data(4,"host=",c->param_hostname,
215					":",c->param_port);
216				BIOerr(BIO_F_CONN_STATE,BIO_R_UNABLE_TO_CREATE_SOCKET);
217				goto exit_loop;
218				}
219			b->num=ret;
220			c->state=BIO_CONN_S_NBIO;
221			break;
222
223		case BIO_CONN_S_NBIO:
224			if (c->nbio)
225				{
226				if (!BIO_socket_nbio(b->num,1))
227					{
228					BIOerr(BIO_F_CONN_STATE,BIO_R_ERROR_SETTING_NBIO);
229					ERR_add_error_data(4,"host=",
230						c->param_hostname,
231						":",c->param_port);
232					goto exit_loop;
233					}
234				}
235			c->state=BIO_CONN_S_CONNECT;
236
237#ifdef SO_KEEPALIVE
238			i=1;
239			i=setsockopt(b->num,SOL_SOCKET,SO_KEEPALIVE,(char *)&i,sizeof(i));
240			if (i < 0)
241				{
242				SYSerr(SYS_F_SOCKET,get_last_socket_error());
243				ERR_add_error_data(4,"host=",c->param_hostname,
244					":",c->param_port);
245				BIOerr(BIO_F_CONN_STATE,BIO_R_KEEPALIVE);
246				goto exit_loop;
247				}
248#endif
249			break;
250
251		case BIO_CONN_S_CONNECT:
252			BIO_clear_retry_flags(b);
253			ret=connect(b->num,
254				(struct sockaddr *)&c->them,
255				sizeof(c->them));
256			b->retry_reason=0;
257			if (ret < 0)
258				{
259				if (BIO_sock_should_retry(ret))
260					{
261					BIO_set_retry_special(b);
262					c->state=BIO_CONN_S_BLOCKED_CONNECT;
263					b->retry_reason=BIO_RR_CONNECT;
264					}
265				else
266					{
267					SYSerr(SYS_F_CONNECT,get_last_socket_error());
268					ERR_add_error_data(4,"host=",
269						c->param_hostname,
270						":",c->param_port);
271					BIOerr(BIO_F_CONN_STATE,BIO_R_CONNECT_ERROR);
272					}
273				goto exit_loop;
274				}
275			else
276				c->state=BIO_CONN_S_OK;
277			break;
278
279		case BIO_CONN_S_BLOCKED_CONNECT:
280			i=BIO_sock_error(b->num);
281			if (i)
282				{
283				BIO_clear_retry_flags(b);
284				SYSerr(SYS_F_CONNECT,i);
285				ERR_add_error_data(4,"host=",
286					c->param_hostname,
287					":",c->param_port);
288				BIOerr(BIO_F_CONN_STATE,BIO_R_NBIO_CONNECT_ERROR);
289				ret=0;
290				goto exit_loop;
291				}
292			else
293				c->state=BIO_CONN_S_OK;
294			break;
295
296		case BIO_CONN_S_OK:
297			ret=1;
298			goto exit_loop;
299		default:
300			abort();
301			goto exit_loop;
302			}
303
304		if (cb != NULL)
305			{
306			if (!(ret=cb((BIO *)b,c->state,ret)))
307				goto end;
308			}
309		}
310
311	/* Loop does not exit */
312exit_loop:
313	if (cb != NULL)
314		ret=cb((BIO *)b,c->state,ret);
315end:
316	return(ret);
317	}
318
319BIO_CONNECT *BIO_CONNECT_new(void)
320	{
321	BIO_CONNECT *ret;
322
323	if ((ret=(BIO_CONNECT *)Malloc(sizeof(BIO_CONNECT))) == NULL)
324		return(NULL);
325	ret->state=BIO_CONN_S_BEFORE;
326	ret->param_hostname=NULL;
327	ret->param_port=NULL;
328	ret->info_callback=NULL;
329	ret->nbio=0;
330	ret->ip[0]=0;
331	ret->ip[1]=0;
332	ret->ip[2]=0;
333	ret->ip[3]=0;
334	ret->port=0;
335	memset((char *)&ret->them,0,sizeof(ret->them));
336	return(ret);
337	}
338
339void BIO_CONNECT_free(BIO_CONNECT *a)
340	{
341	if(a == NULL)
342	    return;
343
344	if (a->param_hostname != NULL)
345		Free(a->param_hostname);
346	if (a->param_port != NULL)
347		Free(a->param_port);
348	Free(a);
349	}
350
351BIO_METHOD *BIO_s_connect(void)
352	{
353	return(&methods_connectp);
354	}
355
356static int conn_new(BIO *bi)
357	{
358	bi->init=0;
359	bi->num=INVALID_SOCKET;
360	bi->flags=0;
361	if ((bi->ptr=(char *)BIO_CONNECT_new()) == NULL)
362		return(0);
363	else
364		return(1);
365	}
366
367static void conn_close_socket(BIO *bio)
368	{
369	BIO_CONNECT *c;
370
371	c=(BIO_CONNECT *)bio->ptr;
372	if (bio->num != INVALID_SOCKET)
373		{
374		/* Only do a shutdown if things were established */
375		if (c->state == BIO_CONN_S_OK)
376			shutdown(bio->num,2);
377		closesocket(bio->num);
378		bio->num=INVALID_SOCKET;
379		}
380	}
381
382static int conn_free(BIO *a)
383	{
384	BIO_CONNECT *data;
385
386	if (a == NULL) return(0);
387	data=(BIO_CONNECT *)a->ptr;
388
389	if (a->shutdown)
390		{
391		conn_close_socket(a);
392		BIO_CONNECT_free(data);
393		a->ptr=NULL;
394		a->flags=0;
395		a->init=0;
396		}
397	return(1);
398	}
399
400static int conn_read(BIO *b, char *out, int outl)
401	{
402	int ret=0;
403	BIO_CONNECT *data;
404
405	data=(BIO_CONNECT *)b->ptr;
406	if (data->state != BIO_CONN_S_OK)
407		{
408		ret=conn_state(b,data);
409		if (ret <= 0)
410				return(ret);
411		}
412
413	if (out != NULL)
414		{
415		clear_socket_error();
416		ret=readsocket(b->num,out,outl);
417		BIO_clear_retry_flags(b);
418		if (ret <= 0)
419			{
420			if (BIO_sock_should_retry(ret))
421				BIO_set_retry_read(b);
422			}
423		}
424	return(ret);
425	}
426
427static int conn_write(BIO *b, char *in, int inl)
428	{
429	int ret;
430	BIO_CONNECT *data;
431
432	data=(BIO_CONNECT *)b->ptr;
433	if (data->state != BIO_CONN_S_OK)
434		{
435		ret=conn_state(b,data);
436		if (ret <= 0) return(ret);
437		}
438
439	clear_socket_error();
440	ret=writesocket(b->num,in,inl);
441	BIO_clear_retry_flags(b);
442	if (ret <= 0)
443		{
444		if (BIO_sock_should_retry(ret))
445			BIO_set_retry_write(b);
446		}
447	return(ret);
448	}
449
450static long conn_ctrl(BIO *b, int cmd, long num, char *ptr)
451	{
452	BIO *dbio;
453	int *ip;
454	const char **pptr;
455	long ret=1;
456	BIO_CONNECT *data;
457
458	data=(BIO_CONNECT *)b->ptr;
459
460	switch (cmd)
461		{
462	case BIO_CTRL_RESET:
463		ret=0;
464		data->state=BIO_CONN_S_BEFORE;
465		conn_close_socket(b);
466		b->flags=0;
467		break;
468	case BIO_C_DO_STATE_MACHINE:
469		/* use this one to start the connection */
470		if (!data->state != BIO_CONN_S_OK)
471			ret=(long)conn_state(b,data);
472		else
473			ret=1;
474		break;
475	case BIO_C_GET_CONNECT:
476		if (ptr != NULL)
477			{
478			pptr=(const char **)ptr;
479			if (num == 0)
480				{
481				*pptr=data->param_hostname;
482
483				}
484			else if (num == 1)
485				{
486				*pptr=data->param_port;
487				}
488			else if (num == 2)
489				{
490				*pptr= (char *)&(data->ip[0]);
491				}
492			else if (num == 3)
493				{
494				*((int *)ptr)=data->port;
495				}
496			if ((!b->init) || (ptr == NULL))
497				*pptr="not initalised";
498			ret=1;
499			}
500		break;
501	case BIO_C_SET_CONNECT:
502		if (ptr != NULL)
503			{
504			b->init=1;
505			if (num == 0)
506				{
507				if (data->param_hostname != NULL)
508					Free(data->param_hostname);
509				data->param_hostname=BUF_strdup(ptr);
510				}
511			else if (num == 1)
512				{
513				if (data->param_port != NULL)
514					Free(data->param_port);
515				data->param_port=BUF_strdup(ptr);
516				}
517			else if (num == 2)
518				{
519				char buf[16];
520
521				sprintf(buf,"%d.%d.%d.%d",
522					ptr[0],ptr[1],ptr[2],ptr[3]);
523				if (data->param_hostname != NULL)
524					Free(data->param_hostname);
525				data->param_hostname=BUF_strdup(buf);
526				memcpy(&(data->ip[0]),ptr,4);
527				}
528			else if (num == 3)
529				{
530				char buf[16];
531
532				sprintf(buf,"%d",*(int *)ptr);
533				if (data->param_port != NULL)
534					Free(data->param_port);
535				data->param_port=BUF_strdup(buf);
536				data->port= *(int *)ptr;
537				}
538			}
539		break;
540	case BIO_C_SET_NBIO:
541		data->nbio=(int)num;
542		break;
543	case BIO_C_GET_FD:
544		if (b->init)
545			{
546			ip=(int *)ptr;
547			if (ip != NULL)
548				*ip=b->num;
549			ret=b->num;
550			}
551		else
552			ret= -1;
553		break;
554	case BIO_CTRL_GET_CLOSE:
555		ret=b->shutdown;
556		break;
557	case BIO_CTRL_SET_CLOSE:
558		b->shutdown=(int)num;
559		break;
560	case BIO_CTRL_PENDING:
561	case BIO_CTRL_WPENDING:
562		ret=0;
563		break;
564	case BIO_CTRL_FLUSH:
565		break;
566	case BIO_CTRL_DUP:
567		dbio=(BIO *)ptr;
568		if (data->param_port)
569			BIO_set_conn_port(dbio,data->param_port);
570		if (data->param_hostname)
571			BIO_set_conn_hostname(dbio,data->param_hostname);
572		BIO_set_nbio(dbio,data->nbio);
573		(void)BIO_set_info_callback(dbio,data->info_callback);
574		break;
575	case BIO_CTRL_SET_CALLBACK:
576		data->info_callback=(int (*)())ptr;
577		break;
578	case BIO_CTRL_GET_CALLBACK:
579		{
580		int (**fptr)();
581
582		fptr=(int (**)())ptr;
583		*fptr=data->info_callback;
584		}
585		break;
586	default:
587		ret=0;
588		break;
589		}
590	return(ret);
591	}
592
593static int conn_puts(BIO *bp, char *str)
594	{
595	int n,ret;
596
597	n=strlen(str);
598	ret=conn_write(bp,str,n);
599	return(ret);
600	}
601
602BIO *BIO_new_connect(char *str)
603	{
604	BIO *ret;
605
606	ret=BIO_new(BIO_s_connect());
607	if (ret == NULL) return(NULL);
608	if (BIO_set_conn_hostname(ret,str))
609		return(ret);
610	else
611		{
612		BIO_free(ret);
613		return(NULL);
614		}
615	}
616
617#endif
618
619