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 = {
57 /* TODO: Convert to new style write function */
60 /* TODO: Convert to new style read function */
64 NULL, /* connect_gets, */
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)
107 OPENSSL_free(a->param_addr);
108 OPENSSL_free(a->param_serv);
109 BIO_ADDRINFO_free(a->addr_first);
110 OPENSSL_free(a->cache_accepting_name);
111 OPENSSL_free(a->cache_accepting_serv);
112 OPENSSL_free(a->cache_peer_name);
113 OPENSSL_free(a->cache_peer_serv);
114 BIO_free(a->bio_chain);
118 static void acpt_close_socket(BIO *bio)
122 c = (BIO_ACCEPT *)bio->ptr;
123 if (c->accept_sock != (int)INVALID_SOCKET) {
124 shutdown(c->accept_sock, 2);
125 closesocket(c->accept_sock);
126 c->accept_sock = (int)INVALID_SOCKET;
127 bio->num = (int)INVALID_SOCKET;
131 static int acpt_free(BIO *a)
137 data = (BIO_ACCEPT *)a->ptr;
140 acpt_close_socket(a);
141 BIO_ACCEPT_free(data);
149 static int acpt_state(BIO *b, BIO_ACCEPT *c)
151 BIO *bio = NULL, *dbio;
152 int s = -1, ret = -1;
157 if (c->param_addr == NULL && c->param_serv == NULL) {
158 BIOerr(BIO_F_ACPT_STATE, BIO_R_NO_ACCEPT_ADDR_OR_SERVICE_SPECIFIED);
159 ERR_add_error_data(4,
160 "hostname=", c->param_addr,
161 " service=", c->param_serv);
165 /* Because we're starting a new bind, any cached name and serv
166 * are now obsolete and need to be cleaned out.
167 * QUESTION: should this be done in acpt_close_socket() instead?
169 OPENSSL_free(c->cache_accepting_name);
170 c->cache_accepting_name = NULL;
171 OPENSSL_free(c->cache_accepting_serv);
172 c->cache_accepting_serv = NULL;
173 OPENSSL_free(c->cache_peer_name);
174 c->cache_peer_name = NULL;
175 OPENSSL_free(c->cache_peer_serv);
176 c->cache_peer_serv = NULL;
178 c->state = ACPT_S_GET_ADDR;
181 case ACPT_S_GET_ADDR:
183 int family = AF_UNSPEC;
184 switch (c->accept_family) {
185 case BIO_FAMILY_IPV6:
186 if (1) { /* This is a trick we use to avoid bit rot.
187 * at least the "else" part will always be
194 BIOerr(BIO_F_ACPT_STATE, BIO_R_UNAVAILABLE_IP_FAMILY);
198 case BIO_FAMILY_IPV4:
201 case BIO_FAMILY_IPANY:
205 BIOerr(BIO_F_ACPT_STATE, BIO_R_UNSUPPORTED_IP_FAMILY);
208 if (BIO_lookup(c->param_addr, c->param_serv, BIO_LOOKUP_SERVER,
209 family, SOCK_STREAM, &c->addr_first) == 0)
212 if (c->addr_first == NULL) {
213 BIOerr(BIO_F_ACPT_STATE, BIO_R_LOOKUP_RETURNED_NOTHING);
216 /* We're currently not iterating, but set this as preparation
217 * for possible future development in that regard
219 c->addr_iter = c->addr_first;
220 c->state = ACPT_S_CREATE_SOCKET;
223 case ACPT_S_CREATE_SOCKET:
224 ret = BIO_socket(BIO_ADDRINFO_family(c->addr_iter),
225 BIO_ADDRINFO_socktype(c->addr_iter),
226 BIO_ADDRINFO_protocol(c->addr_iter), 0);
227 if (ret == (int)INVALID_SOCKET) {
228 SYSerr(SYS_F_SOCKET, get_last_socket_error());
229 ERR_add_error_data(4,
230 "hostname=", c->param_addr,
231 " service=", c->param_serv);
232 BIOerr(BIO_F_ACPT_STATE, BIO_R_UNABLE_TO_CREATE_SOCKET);
235 c->accept_sock = ret;
237 c->state = ACPT_S_LISTEN;
242 if (!BIO_listen(c->accept_sock,
243 BIO_ADDRINFO_address(c->addr_iter),
245 BIO_closesocket(c->accept_sock);
251 union BIO_sock_info_u info;
253 info.addr = &c->cache_accepting_addr;
254 if (!BIO_sock_info(c->accept_sock, BIO_SOCK_INFO_ADDRESS,
256 BIO_closesocket(c->accept_sock);
261 c->cache_accepting_name =
262 BIO_ADDR_hostname_string(&c->cache_accepting_addr, 1);
263 c->cache_accepting_serv =
264 BIO_ADDR_service_string(&c->cache_accepting_addr, 1);
265 c->state = ACPT_S_ACCEPT;
271 if (b->next_bio != NULL) {
272 c->state = ACPT_S_OK;
275 BIO_clear_retry_flags(b);
278 s = BIO_accept_ex(c->accept_sock, &c->cache_peer_addr,
281 /* If the returned socket is invalid, this might still be
285 if (BIO_sock_should_retry(s)) {
286 BIO_set_retry_special(b);
287 b->retry_reason = BIO_RR_ACCEPT;
292 /* If it wasn't retryable, we fail */
298 bio = BIO_new_socket(s, BIO_CLOSE);
302 BIO_set_callback(bio, BIO_get_callback(b));
303 BIO_set_callback_arg(bio, BIO_get_callback_arg(b));
306 * If the accept BIO has an bio_chain, we dup it and put the new
309 if (c->bio_chain != NULL) {
310 if ((dbio = BIO_dup_chain(c->bio_chain)) == NULL)
312 if (!BIO_push(dbio, bio))
316 if (BIO_push(b, bio) == NULL)
320 BIO_ADDR_hostname_string(&c->cache_peer_addr, 1);
322 BIO_ADDR_service_string(&c->cache_peer_addr, 1);
323 c->state = ACPT_S_OK;
329 if (b->next_bio == NULL) {
330 c->state = ACPT_S_ACCEPT;
351 static int acpt_read(BIO *b, char *out, int outl)
356 BIO_clear_retry_flags(b);
357 data = (BIO_ACCEPT *)b->ptr;
359 while (b->next_bio == NULL) {
360 ret = acpt_state(b, data);
365 ret = BIO_read(b->next_bio, out, outl);
366 BIO_copy_next_retry(b);
370 static int acpt_write(BIO *b, const char *in, int inl)
375 BIO_clear_retry_flags(b);
376 data = (BIO_ACCEPT *)b->ptr;
378 while (b->next_bio == NULL) {
379 ret = acpt_state(b, data);
384 ret = BIO_write(b->next_bio, in, inl);
385 BIO_copy_next_retry(b);
389 static long acpt_ctrl(BIO *b, int cmd, long num, void *ptr)
396 data = (BIO_ACCEPT *)b->ptr;
401 data->state = ACPT_S_BEFORE;
402 acpt_close_socket(b);
403 BIO_ADDRINFO_free(data->addr_first);
404 data->addr_first = NULL;
407 case BIO_C_DO_STATE_MACHINE:
408 /* use this one to start the connection */
409 ret = (long)acpt_state(b, data);
411 case BIO_C_SET_ACCEPT:
414 char *hold_serv = data->param_serv;
415 /* We affect the hostname regardless. However, the input
416 * string might contain a host:service spec, so we must
417 * parse it, which might or might not affect the service
419 OPENSSL_free(data->param_addr);
420 data->param_addr = NULL;
421 ret = BIO_parse_hostserv(ptr,
424 BIO_PARSE_PRIO_SERV);
425 if (hold_serv != data->param_serv)
426 OPENSSL_free(hold_serv);
428 } else if (num == 1) {
429 OPENSSL_free(data->param_serv);
430 data->param_serv = BUF_strdup(ptr);
432 } else if (num == 2) {
433 data->bind_mode |= BIO_SOCK_NONBLOCK;
434 } else if (num == 3) {
435 BIO_free(data->bio_chain);
436 data->bio_chain = (BIO *)ptr;
437 } else if (num == 4) {
438 data->accept_family = *(int *)ptr;
442 data->bind_mode &= ~BIO_SOCK_NONBLOCK;
448 data->accepted_mode |= BIO_SOCK_NONBLOCK;
450 data->accepted_mode &= ~BIO_SOCK_NONBLOCK;
454 b->num = *((int *)ptr);
455 data->accept_sock = b->num;
456 data->state = ACPT_S_ACCEPT;
457 b->shutdown = (int)num;
464 *ip = data->accept_sock;
465 ret = data->accept_sock;
469 case BIO_C_GET_ACCEPT:
471 if (num == 0 && ptr != NULL) {
473 *pp = data->cache_accepting_name;
474 } else if (num == 1 && ptr != NULL) {
476 *pp = data->cache_accepting_serv;
477 } else if (num == 2 && ptr != NULL) {
479 *pp = data->cache_peer_name;
480 } else if (num == 3 && ptr != NULL) {
482 *pp = data->cache_peer_serv;
483 } else if (num == 4) {
484 switch (BIO_ADDRINFO_family(data->addr_iter)) {
487 ret = BIO_FAMILY_IPV6;
491 ret = BIO_FAMILY_IPV4;
494 ret = data->accept_family;
505 case BIO_CTRL_GET_CLOSE:
508 case BIO_CTRL_SET_CLOSE:
509 b->shutdown = (int)num;
511 case BIO_CTRL_PENDING:
512 case BIO_CTRL_WPENDING:
517 case BIO_C_SET_BIND_MODE:
518 data->bind_mode = (int)num;
520 case BIO_C_GET_BIND_MODE:
521 ret = (long)data->bind_mode;
525 if (data->param_port) EAY EAY
526 BIO_set_port(dbio,data->param_port);
527 if (data->param_hostname)
528 BIO_set_hostname(dbio,data->param_hostname);
529 BIO_set_nbio(dbio,data->nbio); */
539 static int acpt_puts(BIO *bp, const char *str)
544 ret = acpt_write(bp, str, n);
548 BIO *BIO_new_accept(const char *str)
552 ret = BIO_new(BIO_s_accept());
555 if (BIO_set_accept_name(ret, str))