2 * Copyright 1995-2023 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 #define OPENSSL_SUPPRESS_DEPRECATED
14 #include "bio_local.h"
16 #ifndef OPENSSL_NO_SOCK
18 typedef struct bio_accept_st
{
21 int bind_mode
; /* Socket mode for BIO_listen */
22 int accepted_mode
; /* Socket mode for BIO_accept (set on accepted sock) */
28 BIO_ADDRINFO
*addr_first
;
29 const BIO_ADDRINFO
*addr_iter
;
30 BIO_ADDR cache_accepting_addr
; /* Useful if we asked for port 0 */
31 char *cache_accepting_name
, *cache_accepting_serv
;
32 BIO_ADDR cache_peer_addr
;
33 char *cache_peer_name
, *cache_peer_serv
;
38 static int acpt_write(BIO
*h
, const char *buf
, int num
);
39 static int acpt_read(BIO
*h
, char *buf
, int size
);
40 static int acpt_puts(BIO
*h
, const char *str
);
41 static long acpt_ctrl(BIO
*h
, int cmd
, long arg1
, void *arg2
);
42 static int acpt_new(BIO
*h
);
43 static int acpt_free(BIO
*data
);
44 static int acpt_state(BIO
*b
, BIO_ACCEPT
*c
);
45 static void acpt_close_socket(BIO
*data
);
46 static BIO_ACCEPT
*BIO_ACCEPT_new(void);
47 static void BIO_ACCEPT_free(BIO_ACCEPT
*a
);
49 # define ACPT_S_BEFORE 1
50 # define ACPT_S_GET_ADDR 2
51 # define ACPT_S_CREATE_SOCKET 3
52 # define ACPT_S_LISTEN 4
53 # define ACPT_S_ACCEPT 5
56 static const BIO_METHOD methods_acceptp
= {
64 NULL
, /* connect_gets, */
68 NULL
, /* connect_callback_ctrl */
71 const BIO_METHOD
*BIO_s_accept(void)
73 return &methods_acceptp
;
76 static int acpt_new(BIO
*bi
)
81 bi
->num
= (int)INVALID_SOCKET
;
83 if ((ba
= BIO_ACCEPT_new()) == NULL
)
86 ba
->state
= ACPT_S_BEFORE
;
91 static BIO_ACCEPT
*BIO_ACCEPT_new(void)
95 if ((ret
= OPENSSL_zalloc(sizeof(*ret
))) == NULL
)
97 ret
->accept_family
= BIO_FAMILY_IPANY
;
98 ret
->accept_sock
= (int)INVALID_SOCKET
;
102 static void BIO_ACCEPT_free(BIO_ACCEPT
*a
)
106 OPENSSL_free(a
->param_addr
);
107 OPENSSL_free(a
->param_serv
);
108 BIO_ADDRINFO_free(a
->addr_first
);
109 OPENSSL_free(a
->cache_accepting_name
);
110 OPENSSL_free(a
->cache_accepting_serv
);
111 OPENSSL_free(a
->cache_peer_name
);
112 OPENSSL_free(a
->cache_peer_serv
);
113 BIO_free(a
->bio_chain
);
117 static void acpt_close_socket(BIO
*bio
)
121 c
= (BIO_ACCEPT
*)bio
->ptr
;
122 if (c
->accept_sock
!= (int)INVALID_SOCKET
) {
123 shutdown(c
->accept_sock
, 2);
124 closesocket(c
->accept_sock
);
125 c
->accept_sock
= (int)INVALID_SOCKET
;
126 bio
->num
= (int)INVALID_SOCKET
;
130 static int acpt_free(BIO
*a
)
136 data
= (BIO_ACCEPT
*)a
->ptr
;
139 acpt_close_socket(a
);
140 BIO_ACCEPT_free(data
);
148 static int acpt_state(BIO
*b
, BIO_ACCEPT
*c
)
150 BIO
*bio
= NULL
, *dbio
;
151 int s
= -1, ret
= -1;
156 if (c
->param_addr
== NULL
&& c
->param_serv
== NULL
) {
157 ERR_raise_data(ERR_LIB_BIO
,
158 BIO_R_NO_ACCEPT_ADDR_OR_SERVICE_SPECIFIED
,
159 "hostname=%s, service=%s",
160 c
->param_addr
, c
->param_serv
);
164 /* Because we're starting a new bind, any cached name and serv
165 * are now obsolete and need to be cleaned out.
166 * QUESTION: should this be done in acpt_close_socket() instead?
168 OPENSSL_free(c
->cache_accepting_name
);
169 c
->cache_accepting_name
= NULL
;
170 OPENSSL_free(c
->cache_accepting_serv
);
171 c
->cache_accepting_serv
= NULL
;
172 OPENSSL_free(c
->cache_peer_name
);
173 c
->cache_peer_name
= NULL
;
174 OPENSSL_free(c
->cache_peer_serv
);
175 c
->cache_peer_serv
= NULL
;
177 c
->state
= ACPT_S_GET_ADDR
;
180 case ACPT_S_GET_ADDR
:
182 int family
= AF_UNSPEC
;
183 switch (c
->accept_family
) {
184 case BIO_FAMILY_IPV6
:
185 if (1) { /* This is a trick we use to avoid bit rot.
186 * at least the "else" part will always be
193 ERR_raise(ERR_LIB_BIO
, BIO_R_UNAVAILABLE_IP_FAMILY
);
197 case BIO_FAMILY_IPV4
:
200 case BIO_FAMILY_IPANY
:
204 ERR_raise(ERR_LIB_BIO
, BIO_R_UNSUPPORTED_IP_FAMILY
);
207 if (BIO_lookup(c
->param_addr
, c
->param_serv
, BIO_LOOKUP_SERVER
,
208 family
, SOCK_STREAM
, &c
->addr_first
) == 0)
211 if (c
->addr_first
== NULL
) {
212 ERR_raise(ERR_LIB_BIO
, BIO_R_LOOKUP_RETURNED_NOTHING
);
215 c
->addr_iter
= c
->addr_first
;
216 c
->state
= ACPT_S_CREATE_SOCKET
;
219 case ACPT_S_CREATE_SOCKET
:
221 s
= BIO_socket(BIO_ADDRINFO_family(c
->addr_iter
),
222 BIO_ADDRINFO_socktype(c
->addr_iter
),
223 BIO_ADDRINFO_protocol(c
->addr_iter
), 0);
224 if (s
== (int)INVALID_SOCKET
) {
225 if ((c
->addr_iter
= BIO_ADDRINFO_next(c
->addr_iter
)) != NULL
) {
227 * if there are more addresses to try, do that first
232 ERR_clear_last_mark();
233 ERR_raise_data(ERR_LIB_SYS
, get_last_socket_error(),
234 "calling socket(%s, %s)",
235 c
->param_addr
, c
->param_serv
);
236 ERR_raise(ERR_LIB_BIO
, BIO_R_UNABLE_TO_CREATE_SOCKET
);
241 c
->state
= ACPT_S_LISTEN
;
247 if (!BIO_listen(c
->accept_sock
,
248 BIO_ADDRINFO_address(c
->addr_iter
),
250 BIO_closesocket(c
->accept_sock
);
256 union BIO_sock_info_u info
;
258 info
.addr
= &c
->cache_accepting_addr
;
259 if (!BIO_sock_info(c
->accept_sock
, BIO_SOCK_INFO_ADDRESS
,
261 BIO_closesocket(c
->accept_sock
);
266 c
->cache_accepting_name
=
267 BIO_ADDR_hostname_string(&c
->cache_accepting_addr
, 1);
268 c
->cache_accepting_serv
=
269 BIO_ADDR_service_string(&c
->cache_accepting_addr
, 1);
270 c
->state
= ACPT_S_ACCEPT
;
276 if (b
->next_bio
!= NULL
) {
277 c
->state
= ACPT_S_OK
;
280 BIO_clear_retry_flags(b
);
283 OPENSSL_free(c
->cache_peer_name
);
284 c
->cache_peer_name
= NULL
;
285 OPENSSL_free(c
->cache_peer_serv
);
286 c
->cache_peer_serv
= NULL
;
288 s
= BIO_accept_ex(c
->accept_sock
, &c
->cache_peer_addr
,
291 /* If the returned socket is invalid, this might still be
295 if (BIO_sock_should_retry(s
)) {
296 BIO_set_retry_special(b
);
297 b
->retry_reason
= BIO_RR_ACCEPT
;
302 /* If it wasn't retryable, we fail */
308 bio
= BIO_new_socket(s
, BIO_CLOSE
);
312 BIO_set_callback_ex(bio
, BIO_get_callback_ex(b
));
313 #ifndef OPENSSL_NO_DEPRECATED_3_0
314 BIO_set_callback(bio
, BIO_get_callback(b
));
316 BIO_set_callback_arg(bio
, BIO_get_callback_arg(b
));
318 * If the accept BIO has an bio_chain, we dup it and put the new
321 if (c
->bio_chain
!= NULL
) {
322 if ((dbio
= BIO_dup_chain(c
->bio_chain
)) == NULL
)
324 if (!BIO_push(dbio
, bio
))
328 if (BIO_push(b
, bio
) == NULL
)
332 BIO_ADDR_hostname_string(&c
->cache_peer_addr
, 1);
334 BIO_ADDR_service_string(&c
->cache_peer_addr
, 1);
335 c
->state
= ACPT_S_OK
;
341 if (b
->next_bio
== NULL
) {
342 c
->state
= ACPT_S_ACCEPT
;
363 static int acpt_read(BIO
*b
, char *out
, int outl
)
368 BIO_clear_retry_flags(b
);
369 data
= (BIO_ACCEPT
*)b
->ptr
;
371 while (b
->next_bio
== NULL
) {
372 ret
= acpt_state(b
, data
);
377 ret
= BIO_read(b
->next_bio
, out
, outl
);
378 BIO_copy_next_retry(b
);
382 static int acpt_write(BIO
*b
, const char *in
, int inl
)
387 BIO_clear_retry_flags(b
);
388 data
= (BIO_ACCEPT
*)b
->ptr
;
390 while (b
->next_bio
== NULL
) {
391 ret
= acpt_state(b
, data
);
396 ret
= BIO_write(b
->next_bio
, in
, inl
);
397 BIO_copy_next_retry(b
);
401 static long acpt_ctrl(BIO
*b
, int cmd
, long num
, void *ptr
)
408 data
= (BIO_ACCEPT
*)b
->ptr
;
413 data
->state
= ACPT_S_BEFORE
;
414 acpt_close_socket(b
);
415 BIO_ADDRINFO_free(data
->addr_first
);
416 data
->addr_first
= NULL
;
419 case BIO_C_DO_STATE_MACHINE
:
420 /* use this one to start the connection */
421 ret
= (long)acpt_state(b
, data
);
423 case BIO_C_SET_ACCEPT
:
426 char *hold_serv
= data
->param_serv
;
427 /* We affect the hostname regardless. However, the input
428 * string might contain a host:service spec, so we must
429 * parse it, which might or might not affect the service
431 OPENSSL_free(data
->param_addr
);
432 data
->param_addr
= NULL
;
433 ret
= BIO_parse_hostserv(ptr
,
436 BIO_PARSE_PRIO_SERV
);
437 if (hold_serv
!= data
->param_serv
)
438 OPENSSL_free(hold_serv
);
440 } else if (num
== 1) {
441 OPENSSL_free(data
->param_serv
);
442 if ((data
->param_serv
= OPENSSL_strdup(ptr
)) == NULL
)
446 } else if (num
== 2) {
447 data
->bind_mode
|= BIO_SOCK_NONBLOCK
;
448 } else if (num
== 3) {
449 BIO_free(data
->bio_chain
);
450 data
->bio_chain
= (BIO
*)ptr
;
451 } else if (num
== 4) {
452 data
->accept_family
= *(int *)ptr
;
453 } else if (num
== 5) {
454 data
->bind_mode
|= BIO_SOCK_TFO
;
458 data
->bind_mode
&= ~BIO_SOCK_NONBLOCK
;
459 } else if (num
== 5) {
460 data
->bind_mode
&= ~BIO_SOCK_TFO
;
466 data
->accepted_mode
|= BIO_SOCK_NONBLOCK
;
468 data
->accepted_mode
&= ~BIO_SOCK_NONBLOCK
;
471 b
->num
= *((int *)ptr
);
472 data
->accept_sock
= b
->num
;
473 data
->state
= ACPT_S_ACCEPT
;
474 b
->shutdown
= (int)num
;
481 *ip
= data
->accept_sock
;
482 ret
= data
->accept_sock
;
486 case BIO_C_GET_ACCEPT
:
488 if (num
== 0 && ptr
!= NULL
) {
490 *pp
= data
->cache_accepting_name
;
491 } else if (num
== 1 && ptr
!= NULL
) {
493 *pp
= data
->cache_accepting_serv
;
494 } else if (num
== 2 && ptr
!= NULL
) {
496 *pp
= data
->cache_peer_name
;
497 } else if (num
== 3 && ptr
!= NULL
) {
499 *pp
= data
->cache_peer_serv
;
500 } else if (num
== 4) {
501 switch (BIO_ADDRINFO_family(data
->addr_iter
)) {
504 ret
= BIO_FAMILY_IPV6
;
508 ret
= BIO_FAMILY_IPV4
;
511 ret
= data
->accept_family
;
522 case BIO_CTRL_GET_CLOSE
:
525 case BIO_CTRL_SET_CLOSE
:
526 b
->shutdown
= (int)num
;
528 case BIO_CTRL_PENDING
:
529 case BIO_CTRL_WPENDING
:
534 case BIO_C_SET_BIND_MODE
:
535 data
->bind_mode
= (int)num
;
537 case BIO_C_GET_BIND_MODE
:
538 ret
= (long)data
->bind_mode
;
543 if (b
->next_bio
== NULL
)
546 ret
= BIO_ctrl(b
->next_bio
, cmd
, num
, ptr
);
555 static int acpt_puts(BIO
*bp
, const char *str
)
560 ret
= acpt_write(bp
, str
, n
);
564 BIO
*BIO_new_accept(const char *str
)
568 ret
= BIO_new(BIO_s_accept());
571 if (BIO_set_accept_name(ret
, str
) > 0)