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) {
96 ERR_raise(ERR_LIB_BIO, ERR_R_MALLOC_FAILURE);
99 ret->accept_family = BIO_FAMILY_IPANY;
100 ret->accept_sock = (int)INVALID_SOCKET;
104 static void BIO_ACCEPT_free(BIO_ACCEPT *a)
108 OPENSSL_free(a->param_addr);
109 OPENSSL_free(a->param_serv);
110 BIO_ADDRINFO_free(a->addr_first);
111 OPENSSL_free(a->cache_accepting_name);
112 OPENSSL_free(a->cache_accepting_serv);
113 OPENSSL_free(a->cache_peer_name);
114 OPENSSL_free(a->cache_peer_serv);
115 BIO_free(a->bio_chain);
119 static void acpt_close_socket(BIO *bio)
123 c = (BIO_ACCEPT *)bio->ptr;
124 if (c->accept_sock != (int)INVALID_SOCKET) {
125 shutdown(c->accept_sock, 2);
126 closesocket(c->accept_sock);
127 c->accept_sock = (int)INVALID_SOCKET;
128 bio->num = (int)INVALID_SOCKET;
132 static int acpt_free(BIO *a)
138 data = (BIO_ACCEPT *)a->ptr;
141 acpt_close_socket(a);
142 BIO_ACCEPT_free(data);
150 static int acpt_state(BIO *b, BIO_ACCEPT *c)
152 BIO *bio = NULL, *dbio;
153 int s = -1, ret = -1;
158 if (c->param_addr == NULL && c->param_serv == NULL) {
159 ERR_raise_data(ERR_LIB_BIO,
160 BIO_R_NO_ACCEPT_ADDR_OR_SERVICE_SPECIFIED,
161 "hostname=%s, service=%s",
162 c->param_addr, c->param_serv);
166 /* Because we're starting a new bind, any cached name and serv
167 * are now obsolete and need to be cleaned out.
168 * QUESTION: should this be done in acpt_close_socket() instead?
170 OPENSSL_free(c->cache_accepting_name);
171 c->cache_accepting_name = NULL;
172 OPENSSL_free(c->cache_accepting_serv);
173 c->cache_accepting_serv = NULL;
174 OPENSSL_free(c->cache_peer_name);
175 c->cache_peer_name = NULL;
176 OPENSSL_free(c->cache_peer_serv);
177 c->cache_peer_serv = NULL;
179 c->state = ACPT_S_GET_ADDR;
182 case ACPT_S_GET_ADDR:
184 int family = AF_UNSPEC;
185 switch (c->accept_family) {
186 case BIO_FAMILY_IPV6:
187 if (1) { /* This is a trick we use to avoid bit rot.
188 * at least the "else" part will always be
195 ERR_raise(ERR_LIB_BIO, BIO_R_UNAVAILABLE_IP_FAMILY);
199 case BIO_FAMILY_IPV4:
202 case BIO_FAMILY_IPANY:
206 ERR_raise(ERR_LIB_BIO, BIO_R_UNSUPPORTED_IP_FAMILY);
209 if (BIO_lookup(c->param_addr, c->param_serv, BIO_LOOKUP_SERVER,
210 family, SOCK_STREAM, &c->addr_first) == 0)
213 if (c->addr_first == NULL) {
214 ERR_raise(ERR_LIB_BIO, BIO_R_LOOKUP_RETURNED_NOTHING);
217 c->addr_iter = c->addr_first;
218 c->state = ACPT_S_CREATE_SOCKET;
221 case ACPT_S_CREATE_SOCKET:
223 s = BIO_socket(BIO_ADDRINFO_family(c->addr_iter),
224 BIO_ADDRINFO_socktype(c->addr_iter),
225 BIO_ADDRINFO_protocol(c->addr_iter), 0);
226 if (s == (int)INVALID_SOCKET) {
227 if ((c->addr_iter = BIO_ADDRINFO_next(c->addr_iter)) != NULL) {
229 * if there are more addresses to try, do that first
234 ERR_clear_last_mark();
235 ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(),
236 "calling socket(%s, %s)",
237 c->param_addr, c->param_serv);
238 ERR_raise(ERR_LIB_BIO, BIO_R_UNABLE_TO_CREATE_SOCKET);
243 c->state = ACPT_S_LISTEN;
249 if (!BIO_listen(c->accept_sock,
250 BIO_ADDRINFO_address(c->addr_iter),
252 BIO_closesocket(c->accept_sock);
258 union BIO_sock_info_u info;
260 info.addr = &c->cache_accepting_addr;
261 if (!BIO_sock_info(c->accept_sock, BIO_SOCK_INFO_ADDRESS,
263 BIO_closesocket(c->accept_sock);
268 c->cache_accepting_name =
269 BIO_ADDR_hostname_string(&c->cache_accepting_addr, 1);
270 c->cache_accepting_serv =
271 BIO_ADDR_service_string(&c->cache_accepting_addr, 1);
272 c->state = ACPT_S_ACCEPT;
278 if (b->next_bio != NULL) {
279 c->state = ACPT_S_OK;
282 BIO_clear_retry_flags(b);
285 OPENSSL_free(c->cache_peer_name);
286 c->cache_peer_name = NULL;
287 OPENSSL_free(c->cache_peer_serv);
288 c->cache_peer_serv = NULL;
290 s = BIO_accept_ex(c->accept_sock, &c->cache_peer_addr,
293 /* If the returned socket is invalid, this might still be
297 if (BIO_sock_should_retry(s)) {
298 BIO_set_retry_special(b);
299 b->retry_reason = BIO_RR_ACCEPT;
304 /* If it wasn't retryable, we fail */
310 bio = BIO_new_socket(s, BIO_CLOSE);
314 BIO_set_callback_ex(bio, BIO_get_callback_ex(b));
315 #ifndef OPENSSL_NO_DEPRECATED_3_0
316 BIO_set_callback(bio, BIO_get_callback(b));
318 BIO_set_callback_arg(bio, BIO_get_callback_arg(b));
320 * If the accept BIO has an bio_chain, we dup it and put the new
323 if (c->bio_chain != NULL) {
324 if ((dbio = BIO_dup_chain(c->bio_chain)) == NULL)
326 if (!BIO_push(dbio, bio))
330 if (BIO_push(b, bio) == NULL)
334 BIO_ADDR_hostname_string(&c->cache_peer_addr, 1);
336 BIO_ADDR_service_string(&c->cache_peer_addr, 1);
337 c->state = ACPT_S_OK;
343 if (b->next_bio == NULL) {
344 c->state = ACPT_S_ACCEPT;
365 static int acpt_read(BIO *b, char *out, int outl)
370 BIO_clear_retry_flags(b);
371 data = (BIO_ACCEPT *)b->ptr;
373 while (b->next_bio == NULL) {
374 ret = acpt_state(b, data);
379 ret = BIO_read(b->next_bio, out, outl);
380 BIO_copy_next_retry(b);
384 static int acpt_write(BIO *b, const char *in, int inl)
389 BIO_clear_retry_flags(b);
390 data = (BIO_ACCEPT *)b->ptr;
392 while (b->next_bio == NULL) {
393 ret = acpt_state(b, data);
398 ret = BIO_write(b->next_bio, in, inl);
399 BIO_copy_next_retry(b);
403 static long acpt_ctrl(BIO *b, int cmd, long num, void *ptr)
410 data = (BIO_ACCEPT *)b->ptr;
415 data->state = ACPT_S_BEFORE;
416 acpt_close_socket(b);
417 BIO_ADDRINFO_free(data->addr_first);
418 data->addr_first = NULL;
421 case BIO_C_DO_STATE_MACHINE:
422 /* use this one to start the connection */
423 ret = (long)acpt_state(b, data);
425 case BIO_C_SET_ACCEPT:
428 char *hold_serv = data->param_serv;
429 /* We affect the hostname regardless. However, the input
430 * string might contain a host:service spec, so we must
431 * parse it, which might or might not affect the service
433 OPENSSL_free(data->param_addr);
434 data->param_addr = NULL;
435 ret = BIO_parse_hostserv(ptr,
438 BIO_PARSE_PRIO_SERV);
439 if (hold_serv != data->param_serv)
440 OPENSSL_free(hold_serv);
442 } else if (num == 1) {
443 OPENSSL_free(data->param_serv);
444 if ((data->param_serv = OPENSSL_strdup(ptr)) == NULL)
448 } else if (num == 2) {
449 data->bind_mode |= BIO_SOCK_NONBLOCK;
450 } else if (num == 3) {
451 BIO_free(data->bio_chain);
452 data->bio_chain = (BIO *)ptr;
453 } else if (num == 4) {
454 data->accept_family = *(int *)ptr;
458 data->bind_mode &= ~BIO_SOCK_NONBLOCK;
464 data->accepted_mode |= BIO_SOCK_NONBLOCK;
466 data->accepted_mode &= ~BIO_SOCK_NONBLOCK;
469 b->num = *((int *)ptr);
470 data->accept_sock = b->num;
471 data->state = ACPT_S_ACCEPT;
472 b->shutdown = (int)num;
479 *ip = data->accept_sock;
480 ret = data->accept_sock;
484 case BIO_C_GET_ACCEPT:
486 if (num == 0 && ptr != NULL) {
488 *pp = data->cache_accepting_name;
489 } else if (num == 1 && ptr != NULL) {
491 *pp = data->cache_accepting_serv;
492 } else if (num == 2 && ptr != NULL) {
494 *pp = data->cache_peer_name;
495 } else if (num == 3 && ptr != NULL) {
497 *pp = data->cache_peer_serv;
498 } else if (num == 4) {
499 switch (BIO_ADDRINFO_family(data->addr_iter)) {
502 ret = BIO_FAMILY_IPV6;
506 ret = BIO_FAMILY_IPV4;
509 ret = data->accept_family;
520 case BIO_CTRL_GET_CLOSE:
523 case BIO_CTRL_SET_CLOSE:
524 b->shutdown = (int)num;
526 case BIO_CTRL_PENDING:
527 case BIO_CTRL_WPENDING:
532 case BIO_C_SET_BIND_MODE:
533 data->bind_mode = (int)num;
535 case BIO_C_GET_BIND_MODE:
536 ret = (long)data->bind_mode;
541 if (b->next_bio == NULL)
544 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
553 static int acpt_puts(BIO *bp, const char *str)
558 ret = acpt_write(bp, str, n);
562 BIO *BIO_new_accept(const char *str)
566 ret = BIO_new(BIO_s_accept());
569 if (BIO_set_accept_name(ret, str) > 0)