2 * Copyright 1995-2016 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
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 = {
58 /* TODO: Convert to new style read function */
62 NULL, /* connect_gets, */
69 const BIO_METHOD *BIO_s_accept(void)
71 return (&methods_acceptp);
74 static int acpt_new(BIO *bi)
79 bi->num = (int)INVALID_SOCKET;
81 if ((ba = BIO_ACCEPT_new()) == NULL)
84 ba->state = ACPT_S_BEFORE;
89 static BIO_ACCEPT *BIO_ACCEPT_new(void)
93 if ((ret = OPENSSL_zalloc(sizeof(*ret))) == NULL)
95 ret->accept_family = BIO_FAMILY_IPANY;
96 ret->accept_sock = (int)INVALID_SOCKET;
100 static void BIO_ACCEPT_free(BIO_ACCEPT *a)
105 OPENSSL_free(a->param_addr);
106 OPENSSL_free(a->param_serv);
107 BIO_ADDRINFO_free(a->addr_first);
108 OPENSSL_free(a->cache_accepting_name);
109 OPENSSL_free(a->cache_accepting_serv);
110 OPENSSL_free(a->cache_peer_name);
111 OPENSSL_free(a->cache_peer_serv);
112 BIO_free(a->bio_chain);
116 static void acpt_close_socket(BIO *bio)
120 c = (BIO_ACCEPT *)bio->ptr;
121 if (c->accept_sock != (int)INVALID_SOCKET) {
122 shutdown(c->accept_sock, 2);
123 closesocket(c->accept_sock);
124 c->accept_sock = (int)INVALID_SOCKET;
125 bio->num = (int)INVALID_SOCKET;
129 static int acpt_free(BIO *a)
135 data = (BIO_ACCEPT *)a->ptr;
138 acpt_close_socket(a);
139 BIO_ACCEPT_free(data);
147 static int acpt_state(BIO *b, BIO_ACCEPT *c)
149 BIO *bio = NULL, *dbio;
150 int s = -1, ret = -1;
155 if (c->param_addr == NULL && c->param_serv == NULL) {
156 BIOerr(BIO_F_ACPT_STATE, BIO_R_NO_ACCEPT_ADDR_OR_SERVICE_SPECIFIED);
157 ERR_add_error_data(4,
158 "hostname=", c->param_addr,
159 " service=", c->param_serv);
163 /* Because we're starting a new bind, any cached name and serv
164 * are now obsolete and need to be cleaned out.
165 * QUESTION: should this be done in acpt_close_socket() instead?
167 OPENSSL_free(c->cache_accepting_name);
168 c->cache_accepting_name = NULL;
169 OPENSSL_free(c->cache_accepting_serv);
170 c->cache_accepting_serv = NULL;
171 OPENSSL_free(c->cache_peer_name);
172 c->cache_peer_name = NULL;
173 OPENSSL_free(c->cache_peer_serv);
174 c->cache_peer_serv = NULL;
176 c->state = ACPT_S_GET_ADDR;
179 case ACPT_S_GET_ADDR:
181 int family = AF_UNSPEC;
182 switch (c->accept_family) {
183 case BIO_FAMILY_IPV6:
184 if (1) { /* This is a trick we use to avoid bit rot.
185 * at least the "else" part will always be
192 BIOerr(BIO_F_ACPT_STATE, BIO_R_UNAVAILABLE_IP_FAMILY);
196 case BIO_FAMILY_IPV4:
199 case BIO_FAMILY_IPANY:
203 BIOerr(BIO_F_ACPT_STATE, BIO_R_UNSUPPORTED_IP_FAMILY);
206 if (BIO_lookup(c->param_addr, c->param_serv, BIO_LOOKUP_SERVER,
207 family, SOCK_STREAM, &c->addr_first) == 0)
210 if (c->addr_first == NULL) {
211 BIOerr(BIO_F_ACPT_STATE, BIO_R_LOOKUP_RETURNED_NOTHING);
214 /* We're currently not iterating, but set this as preparation
215 * for possible future development in that regard
217 c->addr_iter = c->addr_first;
218 c->state = ACPT_S_CREATE_SOCKET;
221 case ACPT_S_CREATE_SOCKET:
222 ret = BIO_socket(BIO_ADDRINFO_family(c->addr_iter),
223 BIO_ADDRINFO_socktype(c->addr_iter),
224 BIO_ADDRINFO_protocol(c->addr_iter), 0);
225 if (ret == (int)INVALID_SOCKET) {
226 SYSerr(SYS_F_SOCKET, get_last_socket_error());
227 ERR_add_error_data(4,
228 "hostname=", c->param_addr,
229 " service=", c->param_serv);
230 BIOerr(BIO_F_ACPT_STATE, BIO_R_UNABLE_TO_CREATE_SOCKET);
233 c->accept_sock = ret;
235 c->state = ACPT_S_LISTEN;
240 if (!BIO_listen(c->accept_sock,
241 BIO_ADDRINFO_address(c->addr_iter),
243 BIO_closesocket(c->accept_sock);
249 union BIO_sock_info_u info;
251 info.addr = &c->cache_accepting_addr;
252 if (!BIO_sock_info(c->accept_sock, BIO_SOCK_INFO_ADDRESS,
254 BIO_closesocket(c->accept_sock);
259 c->cache_accepting_name =
260 BIO_ADDR_hostname_string(&c->cache_accepting_addr, 1);
261 c->cache_accepting_serv =
262 BIO_ADDR_service_string(&c->cache_accepting_addr, 1);
263 c->state = ACPT_S_ACCEPT;
269 if (b->next_bio != NULL) {
270 c->state = ACPT_S_OK;
273 BIO_clear_retry_flags(b);
276 s = BIO_accept_ex(c->accept_sock, &c->cache_peer_addr,
279 /* If the returned socket is invalid, this might still be
283 if (BIO_sock_should_retry(s)) {
284 BIO_set_retry_special(b);
285 b->retry_reason = BIO_RR_ACCEPT;
290 /* If it wasn't retryable, we fail */
296 bio = BIO_new_socket(s, BIO_CLOSE);
300 BIO_set_callback(bio, BIO_get_callback(b));
301 BIO_set_callback_arg(bio, BIO_get_callback_arg(b));
304 * If the accept BIO has an bio_chain, we dup it and put the new
307 if (c->bio_chain != NULL) {
308 if ((dbio = BIO_dup_chain(c->bio_chain)) == NULL)
310 if (!BIO_push(dbio, bio))
314 if (BIO_push(b, bio) == NULL)
318 BIO_ADDR_hostname_string(&c->cache_peer_addr, 1);
320 BIO_ADDR_service_string(&c->cache_peer_addr, 1);
321 c->state = ACPT_S_OK;
327 if (b->next_bio == NULL) {
328 c->state = ACPT_S_ACCEPT;
349 static int acpt_read(BIO *b, char *out, int outl)
354 BIO_clear_retry_flags(b);
355 data = (BIO_ACCEPT *)b->ptr;
357 while (b->next_bio == NULL) {
358 ret = acpt_state(b, data);
363 ret = BIO_read(b->next_bio, out, outl);
364 BIO_copy_next_retry(b);
368 static int acpt_write(BIO *b, const char *in, int inl)
373 BIO_clear_retry_flags(b);
374 data = (BIO_ACCEPT *)b->ptr;
376 while (b->next_bio == NULL) {
377 ret = acpt_state(b, data);
382 ret = BIO_write(b->next_bio, in, inl);
383 BIO_copy_next_retry(b);
387 static long acpt_ctrl(BIO *b, int cmd, long num, void *ptr)
394 data = (BIO_ACCEPT *)b->ptr;
399 data->state = ACPT_S_BEFORE;
400 acpt_close_socket(b);
401 BIO_ADDRINFO_free(data->addr_first);
402 data->addr_first = NULL;
405 case BIO_C_DO_STATE_MACHINE:
406 /* use this one to start the connection */
407 ret = (long)acpt_state(b, data);
409 case BIO_C_SET_ACCEPT:
412 char *hold_serv = data->param_serv;
413 /* We affect the hostname regardless. However, the input
414 * string might contain a host:service spec, so we must
415 * parse it, which might or might not affect the service
417 OPENSSL_free(data->param_addr);
418 data->param_addr = NULL;
419 ret = BIO_parse_hostserv(ptr,
422 BIO_PARSE_PRIO_SERV);
423 if (hold_serv != data->param_serv)
424 OPENSSL_free(hold_serv);
426 } else if (num == 1) {
427 OPENSSL_free(data->param_serv);
428 data->param_serv = BUF_strdup(ptr);
430 } else if (num == 2) {
431 data->bind_mode |= BIO_SOCK_NONBLOCK;
432 } else if (num == 3) {
433 BIO_free(data->bio_chain);
434 data->bio_chain = (BIO *)ptr;
435 } else if (num == 4) {
436 data->accept_family = *(int *)ptr;
440 data->bind_mode &= ~BIO_SOCK_NONBLOCK;
446 data->accepted_mode |= BIO_SOCK_NONBLOCK;
448 data->accepted_mode &= ~BIO_SOCK_NONBLOCK;
452 b->num = *((int *)ptr);
453 data->accept_sock = b->num;
454 data->state = ACPT_S_ACCEPT;
455 b->shutdown = (int)num;
462 *ip = data->accept_sock;
463 ret = data->accept_sock;
467 case BIO_C_GET_ACCEPT:
469 if (num == 0 && ptr != NULL) {
471 *pp = data->cache_accepting_name;
472 } else if (num == 1 && ptr != NULL) {
474 *pp = data->cache_accepting_serv;
475 } else if (num == 2 && ptr != NULL) {
477 *pp = data->cache_peer_name;
478 } else if (num == 3 && ptr != NULL) {
480 *pp = data->cache_peer_serv;
481 } else if (num == 4) {
482 switch (BIO_ADDRINFO_family(data->addr_iter)) {
485 ret = BIO_FAMILY_IPV6;
489 ret = BIO_FAMILY_IPV4;
492 ret = data->accept_family;
503 case BIO_CTRL_GET_CLOSE:
506 case BIO_CTRL_SET_CLOSE:
507 b->shutdown = (int)num;
509 case BIO_CTRL_PENDING:
510 case BIO_CTRL_WPENDING:
515 case BIO_C_SET_BIND_MODE:
516 data->bind_mode = (int)num;
518 case BIO_C_GET_BIND_MODE:
519 ret = (long)data->bind_mode;
523 if (data->param_port) EAY EAY
524 BIO_set_port(dbio,data->param_port);
525 if (data->param_hostname)
526 BIO_set_hostname(dbio,data->param_hostname);
527 BIO_set_nbio(dbio,data->nbio); */
537 static int acpt_puts(BIO *bp, const char *str)
542 ret = acpt_write(bp, str, n);
546 BIO *BIO_new_accept(const char *str)
550 ret = BIO_new(BIO_s_accept());
553 if (BIO_set_accept_name(ret, str))