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)