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
78 typedef 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
95 static int acpt_write(BIO *h, const char *buf, int num);
96 static int acpt_read(BIO *h, char *buf, int size);
97 static int acpt_puts(BIO *h, const char *str);
98 static long acpt_ctrl(BIO *h, int cmd, long arg1, void *arg2);
99 static int acpt_new(BIO *h);
100 static int acpt_free(BIO *data);
101 static int acpt_state(BIO *b, BIO_ACCEPT *c);
102 static void acpt_close_socket(BIO *data);
103 static BIO_ACCEPT *BIO_ACCEPT_new(void );
104 static 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
110 static 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
124 BIO_METHOD *BIO_s_accept(void)
125 {
126 return(&methods_acceptp);
127 }
128
129 static 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
144 static 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
157 static 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
168 static 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
182 static 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
200 static int acpt_state(BIO *b, BIO_ACCEPT *c)
201 {
202 BIO *bio=NULL,*dbio;
203 int s= -1;
204 int i;
205
206 again:
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);
281 err:
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
303 static 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
322 static 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
341 static 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
454 static 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
463 BIO *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