22d00b369ecbc2ec0923b0d1212507e950948e6f
[openssl.git] / crypto / bio / bss_conn.c
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
79 typedef 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          * compatible 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 compatibility with the ssl info_callback */
98         int (*info_callback)();
99         } BIO_CONNECT;
100
101 static int conn_write(BIO *h,char *buf,int num);
102 static int conn_read(BIO *h,char *buf,int size);
103 static int conn_puts(BIO *h,char *str);
104 static long conn_ctrl(BIO *h,int cmd,long arg1,char *arg2);
105 static int conn_new(BIO *h);
106 static int conn_free(BIO *data);
107 static long conn_callback_ctrl(BIO *h,int cmd,void *(*fp)());
108
109 static int conn_state(BIO *b, BIO_CONNECT *c);
110 static void conn_close_socket(BIO *data);
111 BIO_CONNECT *BIO_CONNECT_new(void );
112 void BIO_CONNECT_free(BIO_CONNECT *a);
113
114 static BIO_METHOD methods_connectp=
115         {
116         BIO_TYPE_CONNECT,
117         "socket connect",
118         conn_write,
119         conn_read,
120         conn_puts,
121         NULL, /* connect_gets, */
122         conn_ctrl,
123         conn_new,
124         conn_free,
125         conn_callback_ctrl,
126         };
127
128 static int conn_state(BIO *b, BIO_CONNECT *c)
129         {
130         int ret= -1,i;
131         unsigned long l;
132         char *p,*q;
133         int (*cb)()=NULL;
134
135         if (c->info_callback != NULL)
136                 cb=c->info_callback;
137
138         for (;;)
139                 {
140                 switch (c->state)
141                         {
142                 case BIO_CONN_S_BEFORE:
143                         p=c->param_hostname;
144                         if (p == NULL)
145                                 {
146                                 BIOerr(BIO_F_CONN_STATE,BIO_R_NO_HOSTNAME_SPECIFIED);
147                                 goto exit_loop;
148                                 }
149                         for ( ; *p != '\0'; p++)
150                                 {
151                                 if ((*p == ':') || (*p == '/')) break;
152                                 }
153
154                         i= *p;
155                         if ((i == ':') || (i == '/'))
156                                 {
157
158                                 *(p++)='\0';
159                                 if (i == ':')
160                                         {
161                                         for (q=p; *q; q++)
162                                                 if (*q == '/')
163                                                         {
164                                                         *q='\0';
165                                                         break;
166                                                         }
167                                         if (c->param_port != NULL)
168                                                 Free(c->param_port);
169                                         c->param_port=BUF_strdup(p);
170                                         }
171                                 }
172
173                         if (c->param_port == NULL)
174                                 {
175                                 BIOerr(BIO_F_CONN_STATE,BIO_R_NO_PORT_SPECIFIED);
176                                 ERR_add_error_data(2,"host=",c->param_hostname);
177                                 goto exit_loop;
178                                 }
179                         c->state=BIO_CONN_S_GET_IP;
180                         break;
181
182                 case BIO_CONN_S_GET_IP:
183                         if (BIO_get_host_ip(c->param_hostname,&(c->ip[0])) <= 0)
184                                 goto exit_loop;
185                         c->state=BIO_CONN_S_GET_PORT;
186                         break;
187
188                 case BIO_CONN_S_GET_PORT:
189                         if (c->param_port == NULL)
190                                 {
191                                 abort();
192                                 goto exit_loop;
193                                 }
194                         else if (BIO_get_port(c->param_port,&c->port) <= 0)
195                                 goto exit_loop;
196                         c->state=BIO_CONN_S_CREATE_SOCKET;
197                         break;
198
199                 case BIO_CONN_S_CREATE_SOCKET:
200                         /* now setup address */
201                         memset((char *)&c->them,0,sizeof(c->them));
202                         c->them.sin_family=AF_INET;
203                         c->them.sin_port=htons((unsigned short)c->port);
204                         l=(unsigned long)
205                                 ((unsigned long)c->ip[0]<<24L)|
206                                 ((unsigned long)c->ip[1]<<16L)|
207                                 ((unsigned long)c->ip[2]<< 8L)|
208                                 ((unsigned long)c->ip[3]);
209                         c->them.sin_addr.s_addr=htonl(l);
210                         c->state=BIO_CONN_S_CREATE_SOCKET;
211
212                         ret=socket(AF_INET,SOCK_STREAM,SOCKET_PROTOCOL);
213                         if (ret == INVALID_SOCKET)
214                                 {
215                                 SYSerr(SYS_F_SOCKET,get_last_socket_error());
216                                 ERR_add_error_data(4,"host=",c->param_hostname,
217                                         ":",c->param_port);
218                                 BIOerr(BIO_F_CONN_STATE,BIO_R_UNABLE_TO_CREATE_SOCKET);
219                                 goto exit_loop;
220                                 }
221                         b->num=ret;
222                         c->state=BIO_CONN_S_NBIO;
223                         break;
224
225                 case BIO_CONN_S_NBIO:
226                         if (c->nbio)
227                                 {
228                                 if (!BIO_socket_nbio(b->num,1))
229                                         {
230                                         BIOerr(BIO_F_CONN_STATE,BIO_R_ERROR_SETTING_NBIO);
231                                         ERR_add_error_data(4,"host=",
232                                                 c->param_hostname,
233                                                 ":",c->param_port);
234                                         goto exit_loop;
235                                         }
236                                 }
237                         c->state=BIO_CONN_S_CONNECT;
238
239 #ifdef SO_KEEPALIVE
240                         i=1;
241                         i=setsockopt(b->num,SOL_SOCKET,SO_KEEPALIVE,(char *)&i,sizeof(i));
242                         if (i < 0)
243                                 {
244                                 SYSerr(SYS_F_SOCKET,get_last_socket_error());
245                                 ERR_add_error_data(4,"host=",c->param_hostname,
246                                         ":",c->param_port);
247                                 BIOerr(BIO_F_CONN_STATE,BIO_R_KEEPALIVE);
248                                 goto exit_loop;
249                                 }
250 #endif
251                         break;
252
253                 case BIO_CONN_S_CONNECT:
254                         BIO_clear_retry_flags(b);
255                         ret=connect(b->num,
256                                 (struct sockaddr *)&c->them,
257                                 sizeof(c->them));
258                         b->retry_reason=0;
259                         if (ret < 0)
260                                 {
261                                 if (BIO_sock_should_retry(ret))
262                                         {
263                                         BIO_set_retry_special(b);
264                                         c->state=BIO_CONN_S_BLOCKED_CONNECT;
265                                         b->retry_reason=BIO_RR_CONNECT;
266                                         }
267                                 else
268                                         {
269                                         SYSerr(SYS_F_CONNECT,get_last_socket_error());
270                                         ERR_add_error_data(4,"host=",
271                                                 c->param_hostname,
272                                                 ":",c->param_port);
273                                         BIOerr(BIO_F_CONN_STATE,BIO_R_CONNECT_ERROR);
274                                         }
275                                 goto exit_loop;
276                                 }
277                         else
278                                 c->state=BIO_CONN_S_OK;
279                         break;
280
281                 case BIO_CONN_S_BLOCKED_CONNECT:
282                         i=BIO_sock_error(b->num);
283                         if (i)
284                                 {
285                                 BIO_clear_retry_flags(b);
286                                 SYSerr(SYS_F_CONNECT,i);
287                                 ERR_add_error_data(4,"host=",
288                                         c->param_hostname,
289                                         ":",c->param_port);
290                                 BIOerr(BIO_F_CONN_STATE,BIO_R_NBIO_CONNECT_ERROR);
291                                 ret=0;
292                                 goto exit_loop;
293                                 }
294                         else
295                                 c->state=BIO_CONN_S_OK;
296                         break;
297
298                 case BIO_CONN_S_OK:
299                         ret=1;
300                         goto exit_loop;
301                 default:
302                         abort();
303                         goto exit_loop;
304                         }
305
306                 if (cb != NULL)
307                         {
308                         if (!(ret=cb((BIO *)b,c->state,ret)))
309                                 goto end;
310                         }
311                 }
312
313         /* Loop does not exit */
314 exit_loop:
315         if (cb != NULL)
316                 ret=cb((BIO *)b,c->state,ret);
317 end:
318         return(ret);
319         }
320
321 BIO_CONNECT *BIO_CONNECT_new(void)
322         {
323         BIO_CONNECT *ret;
324
325         if ((ret=(BIO_CONNECT *)Malloc(sizeof(BIO_CONNECT))) == NULL)
326                 return(NULL);
327         ret->state=BIO_CONN_S_BEFORE;
328         ret->param_hostname=NULL;
329         ret->param_port=NULL;
330         ret->info_callback=NULL;
331         ret->nbio=0;
332         ret->ip[0]=0;
333         ret->ip[1]=0;
334         ret->ip[2]=0;
335         ret->ip[3]=0;
336         ret->port=0;
337         memset((char *)&ret->them,0,sizeof(ret->them));
338         return(ret);
339         }
340
341 void BIO_CONNECT_free(BIO_CONNECT *a)
342         {
343         if(a == NULL)
344             return;
345
346         if (a->param_hostname != NULL)
347                 Free(a->param_hostname);
348         if (a->param_port != NULL)
349                 Free(a->param_port);
350         Free(a);
351         }
352
353 BIO_METHOD *BIO_s_connect(void)
354         {
355         return(&methods_connectp);
356         }
357
358 static int conn_new(BIO *bi)
359         {
360         bi->init=0;
361         bi->num=INVALID_SOCKET;
362         bi->flags=0;
363         if ((bi->ptr=(char *)BIO_CONNECT_new()) == NULL)
364                 return(0);
365         else
366                 return(1);
367         }
368
369 static void conn_close_socket(BIO *bio)
370         {
371         BIO_CONNECT *c;
372
373         c=(BIO_CONNECT *)bio->ptr;
374         if (bio->num != INVALID_SOCKET)
375                 {
376                 /* Only do a shutdown if things were established */
377                 if (c->state == BIO_CONN_S_OK)
378                         shutdown(bio->num,2);
379                 closesocket(bio->num);
380                 bio->num=INVALID_SOCKET;
381                 }
382         }
383
384 static int conn_free(BIO *a)
385         {
386         BIO_CONNECT *data;
387
388         if (a == NULL) return(0);
389         data=(BIO_CONNECT *)a->ptr;
390          
391         if (a->shutdown)
392                 {
393                 conn_close_socket(a);
394                 BIO_CONNECT_free(data);
395                 a->ptr=NULL;
396                 a->flags=0;
397                 a->init=0;
398                 }
399         return(1);
400         }
401         
402 static int conn_read(BIO *b, char *out, int outl)
403         {
404         int ret=0;
405         BIO_CONNECT *data;
406
407         data=(BIO_CONNECT *)b->ptr;
408         if (data->state != BIO_CONN_S_OK)
409                 {
410                 ret=conn_state(b,data);
411                 if (ret <= 0)
412                                 return(ret);
413                 }
414
415         if (out != NULL)
416                 {
417                 clear_socket_error();
418                 ret=readsocket(b->num,out,outl);
419                 BIO_clear_retry_flags(b);
420                 if (ret <= 0)
421                         {
422                         if (BIO_sock_should_retry(ret))
423                                 BIO_set_retry_read(b);
424                         }
425                 }
426         return(ret);
427         }
428
429 static int conn_write(BIO *b, char *in, int inl)
430         {
431         int ret;
432         BIO_CONNECT *data;
433
434         data=(BIO_CONNECT *)b->ptr;
435         if (data->state != BIO_CONN_S_OK)
436                 {
437                 ret=conn_state(b,data);
438                 if (ret <= 0) return(ret);
439                 }
440
441         clear_socket_error();
442         ret=writesocket(b->num,in,inl);
443         BIO_clear_retry_flags(b);
444         if (ret <= 0)
445                 {
446                 if (BIO_sock_should_retry(ret))
447                         BIO_set_retry_write(b);
448                 }
449         return(ret);
450         }
451
452 static long conn_ctrl(BIO *b, int cmd, long num, char *ptr)
453         {
454         BIO *dbio;
455         int *ip;
456         const char **pptr;
457         long ret=1;
458         BIO_CONNECT *data;
459
460         data=(BIO_CONNECT *)b->ptr;
461
462         switch (cmd)
463                 {
464         case BIO_CTRL_RESET:
465                 ret=0;
466                 data->state=BIO_CONN_S_BEFORE;
467                 conn_close_socket(b);
468                 b->flags=0;
469                 break;
470         case BIO_C_DO_STATE_MACHINE:
471                 /* use this one to start the connection */
472                 if (!data->state != BIO_CONN_S_OK)
473                         ret=(long)conn_state(b,data);
474                 else
475                         ret=1;
476                 break;
477         case BIO_C_GET_CONNECT:
478                 if (ptr != NULL)
479                         {
480                         pptr=(const char **)ptr;
481                         if (num == 0)
482                                 {
483                                 *pptr=data->param_hostname;
484
485                                 }
486                         else if (num == 1)
487                                 {
488                                 *pptr=data->param_port;
489                                 }
490                         else if (num == 2)
491                                 {
492                                 *pptr= (char *)&(data->ip[0]);
493                                 }
494                         else if (num == 3)
495                                 {
496                                 *((int *)ptr)=data->port;
497                                 }
498                         if ((!b->init) || (ptr == NULL))
499                                 *pptr="not initialized";
500                         ret=1;
501                         }
502                 break;
503         case BIO_C_SET_CONNECT:
504                 if (ptr != NULL)
505                         {
506                         b->init=1;
507                         if (num == 0)
508                                 {
509                                 if (data->param_hostname != NULL)
510                                         Free(data->param_hostname);
511                                 data->param_hostname=BUF_strdup(ptr);
512                                 }
513                         else if (num == 1)
514                                 {
515                                 if (data->param_port != NULL)
516                                         Free(data->param_port);
517                                 data->param_port=BUF_strdup(ptr);
518                                 }
519                         else if (num == 2)
520                                 {
521                                 char buf[16];
522
523                                 sprintf(buf,"%d.%d.%d.%d",
524                                         ptr[0],ptr[1],ptr[2],ptr[3]);
525                                 if (data->param_hostname != NULL)
526                                         Free(data->param_hostname);
527                                 data->param_hostname=BUF_strdup(buf);
528                                 memcpy(&(data->ip[0]),ptr,4);
529                                 }
530                         else if (num == 3)
531                                 {
532                                 char buf[16];
533
534                                 sprintf(buf,"%d",*(int *)ptr);
535                                 if (data->param_port != NULL)
536                                         Free(data->param_port);
537                                 data->param_port=BUF_strdup(buf);
538                                 data->port= *(int *)ptr;
539                                 }
540                         }
541                 break;
542         case BIO_C_SET_NBIO:
543                 data->nbio=(int)num;
544                 break;
545         case BIO_C_GET_FD:
546                 if (b->init)
547                         {
548                         ip=(int *)ptr;
549                         if (ip != NULL)
550                                 *ip=b->num;
551                         ret=b->num;
552                         }
553                 else
554                         ret= -1;
555                 break;
556         case BIO_CTRL_GET_CLOSE:
557                 ret=b->shutdown;
558                 break;
559         case BIO_CTRL_SET_CLOSE:
560                 b->shutdown=(int)num;
561                 break;
562         case BIO_CTRL_PENDING:
563         case BIO_CTRL_WPENDING:
564                 ret=0;
565                 break;
566         case BIO_CTRL_FLUSH:
567                 break;
568         case BIO_CTRL_DUP:
569                 {
570                 dbio=(BIO *)ptr;
571                 if (data->param_port)
572                         BIO_set_conn_port(dbio,data->param_port);
573                 if (data->param_hostname)
574                         BIO_set_conn_hostname(dbio,data->param_hostname);
575                 BIO_set_nbio(dbio,data->nbio);
576                 (void)BIO_set_info_callback(dbio,(void *(*)())(data->info_callback));
577                 }
578                 break;
579         case BIO_CTRL_SET_CALLBACK:
580                 {
581 #if 0 /* FIXME: Should this be used?  -- Richard Levitte */
582                 BIOerr(BIO_F_CONN_CTRL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
583                 ret = -1;
584 #else
585                 ret=0;
586 #endif
587                 }
588                 break;
589         case BIO_CTRL_GET_CALLBACK:
590                 {
591                 int (**fptr)();
592
593                 fptr=(int (**)())ptr;
594                 *fptr=data->info_callback;
595                 }
596                 break;
597         default:
598                 ret=0;
599                 break;
600                 }
601         return(ret);
602         }
603
604 static long conn_callback_ctrl(BIO *b, int cmd, void *(*fp)())
605         {
606         long ret=1;
607         BIO_CONNECT *data;
608
609         data=(BIO_CONNECT *)b->ptr;
610
611         switch (cmd)
612                 {
613         case BIO_CTRL_SET_CALLBACK:
614                 {
615                 data->info_callback=(int (*)())fp;
616                 }
617                 break;
618         default:
619                 ret=0;
620                 break;
621                 }
622         return(ret);
623         }
624
625 static int conn_puts(BIO *bp, char *str)
626         {
627         int n,ret;
628
629         n=strlen(str);
630         ret=conn_write(bp,str,n);
631         return(ret);
632         }
633
634 BIO *BIO_new_connect(char *str)
635         {
636         BIO *ret;
637
638         ret=BIO_new(BIO_s_connect());
639         if (ret == NULL) return(NULL);
640         if (BIO_set_conn_hostname(ret,str))
641                 return(ret);
642         else
643                 {
644                 BIO_free(ret);
645                 return(NULL);
646                 }
647         }
648
649 #endif
650