2 * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (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
12 #include "bio_local.h"
14 #ifndef OPENSSL_NO_SOCK
16 typedef struct bio_accept_st {
19 int bind_mode; /* Socket mode for BIO_listen */
20 int accepted_mode; /* Socket mode for BIO_accept (set on accepted sock) */
26 BIO_ADDRINFO *addr_first;
27 const BIO_ADDRINFO *addr_iter;
28 BIO_ADDR cache_accepting_addr; /* Useful if we asked for port 0 */
29 char *cache_accepting_name, *cache_accepting_serv;
30 BIO_ADDR cache_peer_addr;
31 char *cache_peer_name, *cache_peer_serv;
36 static int acpt_write(BIO *h, const char *buf, int num);
37 static int acpt_read(BIO *h, char *buf, int size);
38 static int acpt_puts(BIO *h, const char *str);
39 static long acpt_ctrl(BIO *h, int cmd, long arg1, void *arg2);
40 static int acpt_new(BIO *h);
41 static int acpt_free(BIO *data);
42 static int acpt_state(BIO *b, BIO_ACCEPT *c);
43 static void acpt_close_socket(BIO *data);
44 static BIO_ACCEPT *BIO_ACCEPT_new(void);
45 static void BIO_ACCEPT_free(BIO_ACCEPT *a);
47 # define ACPT_S_BEFORE 1
48 # define ACPT_S_GET_ADDR 2
49 # define ACPT_S_CREATE_SOCKET 3
50 # define ACPT_S_LISTEN 4
51 # define ACPT_S_ACCEPT 5
54 static const BIO_METHOD methods_acceptp = {
57 /* TODO: Convert to new style write function */
60 /* TODO: Convert to new style read function */
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 BIOerr(BIO_F_BIO_ACCEPT_NEW, 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 BIOerr(BIO_F_ACPT_STATE, BIO_R_NO_ACCEPT_ADDR_OR_SERVICE_SPECIFIED);
160 ERR_add_error_data(4,
161 "hostname=", c->param_addr,
162 " service=", 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 BIOerr(BIO_F_ACPT_STATE, BIO_R_UNAVAILABLE_IP_FAMILY);
199 case BIO_FAMILY_IPV4:
202 case BIO_FAMILY_IPANY:
206 BIOerr(BIO_F_ACPT_STATE, 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 BIOerr(BIO_F_ACPT_STATE, BIO_R_LOOKUP_RETURNED_NOTHING);
217 /* We're currently not iterating, but set this as preparation
218 * for possible future development in that regard
220 c->addr_iter = c->addr_first;
221 c->state = ACPT_S_CREATE_SOCKET;
224 case ACPT_S_CREATE_SOCKET:
225 s = BIO_socket(BIO_ADDRINFO_family(c->addr_iter),
226 BIO_ADDRINFO_socktype(c->addr_iter),
227 BIO_ADDRINFO_protocol(c->addr_iter), 0);
228 if (s == (int)INVALID_SOCKET) {
229 SYSerr(SYS_F_SOCKET, get_last_socket_error());
230 ERR_add_error_data(4,
231 "hostname=", c->param_addr,
232 " service=", c->param_serv);
233 BIOerr(BIO_F_ACPT_STATE, BIO_R_UNABLE_TO_CREATE_SOCKET);
238 c->state = ACPT_S_LISTEN;
244 if (!BIO_listen(c->accept_sock,
245 BIO_ADDRINFO_address(c->addr_iter),
247 BIO_closesocket(c->accept_sock);
253 union BIO_sock_info_u info;
255 info.addr = &c->cache_accepting_addr;
256 if (!BIO_sock_info(c->accept_sock, BIO_SOCK_INFO_ADDRESS,
258 BIO_closesocket(c->accept_sock);
263 c->cache_accepting_name =
264 BIO_ADDR_hostname_string(&c->cache_accepting_addr, 1);
265 c->cache_accepting_serv =
266 BIO_ADDR_service_string(&c->cache_accepting_addr, 1);
267 c->state = ACPT_S_ACCEPT;
273 if (b->next_bio != NULL) {
274 c->state = ACPT_S_OK;
277 BIO_clear_retry_flags(b);
280 OPENSSL_free(c->cache_peer_name);
281 c->cache_peer_name = NULL;
282 OPENSSL_free(c->cache_peer_serv);
283 c->cache_peer_serv = NULL;
285 s = BIO_accept_ex(c->accept_sock, &c->cache_peer_addr,
288 /* If the returned socket is invalid, this might still be
292 if (BIO_sock_should_retry(s)) {
293 BIO_set_retry_special(b);
294 b->retry_reason = BIO_RR_ACCEPT;
299 /* If it wasn't retryable, we fail */
305 bio = BIO_new_socket(s, BIO_CLOSE);
309 BIO_set_callback(bio, BIO_get_callback(b));
310 BIO_set_callback_arg(bio, BIO_get_callback_arg(b));
313 * If the accept BIO has an bio_chain, we dup it and put the new
316 if (c->bio_chain != NULL) {
317 if ((dbio = BIO_dup_chain(c->bio_chain)) == NULL)
319 if (!BIO_push(dbio, bio))
323 if (BIO_push(b, bio) == NULL)
327 BIO_ADDR_hostname_string(&c->cache_peer_addr, 1);
329 BIO_ADDR_service_string(&c->cache_peer_addr, 1);
330 c->state = ACPT_S_OK;
336 if (b->next_bio == NULL) {
337 c->state = ACPT_S_ACCEPT;
358 static int acpt_read(BIO *b, char *out, int outl)
363 BIO_clear_retry_flags(b);
364 data = (BIO_ACCEPT *)b->ptr;
366 while (b->next_bio == NULL) {
367 ret = acpt_state(b, data);
372 ret = BIO_read(b->next_bio, out, outl);
373 BIO_copy_next_retry(b);
377 static int acpt_write(BIO *b, const char *in, int inl)
382 BIO_clear_retry_flags(b);
383 data = (BIO_ACCEPT *)b->ptr;
385 while (b->next_bio == NULL) {
386 ret = acpt_state(b, data);
391 ret = BIO_write(b->next_bio, in, inl);
392 BIO_copy_next_retry(b);
396 static long acpt_ctrl(BIO *b, int cmd, long num, void *ptr)
403 data = (BIO_ACCEPT *)b->ptr;
408 data->state = ACPT_S_BEFORE;
409 acpt_close_socket(b);
410 BIO_ADDRINFO_free(data->addr_first);
411 data->addr_first = NULL;
414 case BIO_C_DO_STATE_MACHINE:
415 /* use this one to start the connection */
416 ret = (long)acpt_state(b, data);
418 case BIO_C_SET_ACCEPT:
421 char *hold_serv = data->param_serv;
422 /* We affect the hostname regardless. However, the input
423 * string might contain a host:service spec, so we must
424 * parse it, which might or might not affect the service
426 OPENSSL_free(data->param_addr);
427 data->param_addr = NULL;
428 ret = BIO_parse_hostserv(ptr,
431 BIO_PARSE_PRIO_SERV);
432 if (hold_serv != data->param_serv)
433 OPENSSL_free(hold_serv);
435 } else if (num == 1) {
436 OPENSSL_free(data->param_serv);
437 data->param_serv = BUF_strdup(ptr);
439 } else if (num == 2) {
440 data->bind_mode |= BIO_SOCK_NONBLOCK;
441 } else if (num == 3) {
442 BIO_free(data->bio_chain);
443 data->bio_chain = (BIO *)ptr;
444 } else if (num == 4) {
445 data->accept_family = *(int *)ptr;
449 data->bind_mode &= ~BIO_SOCK_NONBLOCK;
455 data->accepted_mode |= BIO_SOCK_NONBLOCK;
457 data->accepted_mode &= ~BIO_SOCK_NONBLOCK;
460 b->num = *((int *)ptr);
461 data->accept_sock = b->num;
462 data->state = ACPT_S_ACCEPT;
463 b->shutdown = (int)num;
470 *ip = data->accept_sock;
471 ret = data->accept_sock;
475 case BIO_C_GET_ACCEPT:
477 if (num == 0 && ptr != NULL) {
479 *pp = data->cache_accepting_name;
480 } else if (num == 1 && ptr != NULL) {
482 *pp = data->cache_accepting_serv;
483 } else if (num == 2 && ptr != NULL) {
485 *pp = data->cache_peer_name;
486 } else if (num == 3 && ptr != NULL) {
488 *pp = data->cache_peer_serv;
489 } else if (num == 4) {
490 switch (BIO_ADDRINFO_family(data->addr_iter)) {
493 ret = BIO_FAMILY_IPV6;
497 ret = BIO_FAMILY_IPV4;
500 ret = data->accept_family;
511 case BIO_CTRL_GET_CLOSE:
514 case BIO_CTRL_SET_CLOSE:
515 b->shutdown = (int)num;
517 case BIO_CTRL_PENDING:
518 case BIO_CTRL_WPENDING:
523 case BIO_C_SET_BIND_MODE:
524 data->bind_mode = (int)num;
526 case BIO_C_GET_BIND_MODE:
527 ret = (long)data->bind_mode;
532 if (b->next_bio == NULL)
535 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
544 static int acpt_puts(BIO *bp, const char *str)
549 ret = acpt_write(bp, str, n);
553 BIO *BIO_new_accept(const char *str)
557 ret = BIO_new(BIO_s_accept());
560 if (BIO_set_accept_name(ret, str))