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
15 #ifndef OPENSSL_NO_SOCK
17 typedef struct bio_connect_st {
24 BIO_ADDRINFO *addr_first;
25 const BIO_ADDRINFO *addr_iter;
27 * int socket; this will be kept in bio->num so that it is compatible
28 * with the bss_sock bio
31 * called when the connection is initially made callback(BIO,state,ret);
32 * The callback should return 'ret'. state is for compatibility with the
35 int (*info_callback) (const BIO *bio, int state, int ret);
38 static int conn_write(BIO *h, const char *buf, int num);
39 static int conn_read(BIO *h, char *buf, int size);
40 static int conn_puts(BIO *h, const char *str);
41 static long conn_ctrl(BIO *h, int cmd, long arg1, void *arg2);
42 static int conn_new(BIO *h);
43 static int conn_free(BIO *data);
44 static long conn_callback_ctrl(BIO *h, int cmd, bio_info_cb *);
46 static int conn_state(BIO *b, BIO_CONNECT *c);
47 static void conn_close_socket(BIO *data);
48 BIO_CONNECT *BIO_CONNECT_new(void);
49 void BIO_CONNECT_free(BIO_CONNECT *a);
51 #define BIO_CONN_S_BEFORE 1
52 #define BIO_CONN_S_GET_ADDR 2
53 #define BIO_CONN_S_CREATE_SOCKET 3
54 #define BIO_CONN_S_CONNECT 4
55 #define BIO_CONN_S_OK 5
56 #define BIO_CONN_S_BLOCKED_CONNECT 6
58 static const BIO_METHOD methods_connectp = {
64 NULL, /* connect_gets, */
71 static int conn_state(BIO *b, BIO_CONNECT *c)
74 int (*cb) (const BIO *, int, int) = NULL;
76 if (c->info_callback != NULL)
77 cb = c->info_callback;
81 case BIO_CONN_S_BEFORE:
82 if (c->param_hostname == NULL && c->param_service == NULL) {
83 BIOerr(BIO_F_CONN_STATE, BIO_R_NO_HOSTNAME_OR_SERVICE_SPECIFIED);
85 "hostname=", c->param_hostname,
86 " service=", c->param_service);
89 c->state = BIO_CONN_S_GET_ADDR;
92 case BIO_CONN_S_GET_ADDR:
94 int family = AF_UNSPEC;
95 switch (c->connect_family) {
97 if (1) { /* This is a trick we use to avoid bit rot.
98 * at least the "else" part will always be
105 BIOerr(BIO_F_CONN_STATE, BIO_R_UNAVAILABLE_IP_FAMILY);
109 case BIO_FAMILY_IPV4:
112 case BIO_FAMILY_IPANY:
116 BIOerr(BIO_F_CONN_STATE, BIO_R_UNSUPPORTED_IP_FAMILY);
119 if (BIO_lookup(c->param_hostname, c->param_service,
121 family, SOCK_STREAM, &c->addr_first) == 0)
124 if (c->addr_first == NULL) {
125 BIOerr(BIO_F_CONN_STATE, BIO_R_LOOKUP_RETURNED_NOTHING);
128 c->addr_iter = c->addr_first;
129 c->state = BIO_CONN_S_CREATE_SOCKET;
132 case BIO_CONN_S_CREATE_SOCKET:
133 ret = BIO_socket(BIO_ADDRINFO_family(c->addr_iter),
134 BIO_ADDRINFO_socktype(c->addr_iter),
135 BIO_ADDRINFO_protocol(c->addr_iter), 0);
136 if (ret == (int)INVALID_SOCKET) {
137 SYSerr(SYS_F_SOCKET, get_last_socket_error());
138 ERR_add_error_data(4,
139 "hostname=", c->param_hostname,
140 " service=", c->param_service);
141 BIOerr(BIO_F_CONN_STATE, BIO_R_UNABLE_TO_CREATE_SOCKET);
145 c->state = BIO_CONN_S_CONNECT;
148 case BIO_CONN_S_CONNECT:
149 BIO_clear_retry_flags(b);
150 ret = BIO_connect(b->num, BIO_ADDRINFO_address(c->addr_iter),
151 BIO_SOCK_KEEPALIVE | c->connect_mode);
154 if (BIO_sock_should_retry(ret)) {
155 BIO_set_retry_special(b);
156 c->state = BIO_CONN_S_BLOCKED_CONNECT;
157 b->retry_reason = BIO_RR_CONNECT;
159 } else if ((c->addr_iter = BIO_ADDRINFO_next(c->addr_iter))
162 * if there are more addresses to try, do that first
164 BIO_closesocket(b->num);
165 c->state = BIO_CONN_S_CREATE_SOCKET;
169 SYSerr(SYS_F_CONNECT, get_last_socket_error());
170 ERR_add_error_data(4,
171 "hostname=", c->param_hostname,
172 " service=", c->param_service);
173 BIOerr(BIO_F_CONN_STATE, BIO_R_CONNECT_ERROR);
177 c->state = BIO_CONN_S_OK;
181 case BIO_CONN_S_BLOCKED_CONNECT:
182 i = BIO_sock_error(b->num);
184 BIO_clear_retry_flags(b);
185 SYSerr(SYS_F_CONNECT, i);
186 ERR_add_error_data(4,
187 "hostname=", c->param_hostname,
188 " service=", c->param_service);
189 BIOerr(BIO_F_CONN_STATE, BIO_R_NBIO_CONNECT_ERROR);
193 c->state = BIO_CONN_S_OK;
205 if ((ret = cb((BIO *)b, c->state, ret)) == 0)
210 /* Loop does not exit */
213 ret = cb((BIO *)b, c->state, ret);
218 BIO_CONNECT *BIO_CONNECT_new(void)
222 if ((ret = OPENSSL_zalloc(sizeof(*ret))) == NULL)
224 ret->state = BIO_CONN_S_BEFORE;
225 ret->connect_family = BIO_FAMILY_IPANY;
229 void BIO_CONNECT_free(BIO_CONNECT *a)
234 OPENSSL_free(a->param_hostname);
235 OPENSSL_free(a->param_service);
236 BIO_ADDRINFO_free(a->addr_first);
240 const BIO_METHOD *BIO_s_connect(void)
242 return (&methods_connectp);
245 static int conn_new(BIO *bi)
248 bi->num = (int)INVALID_SOCKET;
250 if ((bi->ptr = (char *)BIO_CONNECT_new()) == NULL)
256 static void conn_close_socket(BIO *bio)
260 c = (BIO_CONNECT *)bio->ptr;
261 if (bio->num != (int)INVALID_SOCKET) {
262 /* Only do a shutdown if things were established */
263 if (c->state == BIO_CONN_S_OK)
264 shutdown(bio->num, 2);
265 BIO_closesocket(bio->num);
266 bio->num = (int)INVALID_SOCKET;
270 static int conn_free(BIO *a)
276 data = (BIO_CONNECT *)a->ptr;
279 conn_close_socket(a);
280 BIO_CONNECT_free(data);
288 static int conn_read(BIO *b, char *out, int outl)
293 data = (BIO_CONNECT *)b->ptr;
294 if (data->state != BIO_CONN_S_OK) {
295 ret = conn_state(b, data);
301 clear_socket_error();
302 ret = readsocket(b->num, out, outl);
303 BIO_clear_retry_flags(b);
305 if (BIO_sock_should_retry(ret))
306 BIO_set_retry_read(b);
312 static int conn_write(BIO *b, const char *in, int inl)
317 data = (BIO_CONNECT *)b->ptr;
318 if (data->state != BIO_CONN_S_OK) {
319 ret = conn_state(b, data);
324 clear_socket_error();
325 ret = writesocket(b->num, in, inl);
326 BIO_clear_retry_flags(b);
328 if (BIO_sock_should_retry(ret))
329 BIO_set_retry_write(b);
334 static long conn_ctrl(BIO *b, int cmd, long num, void *ptr)
338 const char **pptr = NULL;
342 data = (BIO_CONNECT *)b->ptr;
347 data->state = BIO_CONN_S_BEFORE;
348 conn_close_socket(b);
349 BIO_ADDRINFO_free(data->addr_first);
350 data->addr_first = NULL;
353 case BIO_C_DO_STATE_MACHINE:
354 /* use this one to start the connection */
355 if (data->state != BIO_CONN_S_OK)
356 ret = (long)conn_state(b, data);
360 case BIO_C_GET_CONNECT:
362 pptr = (const char **)ptr;
364 *pptr = data->param_hostname;
365 } else if (num == 1) {
366 *pptr = data->param_service;
367 } else if (num == 2) {
368 *pptr = (const char *)BIO_ADDRINFO_address(data->addr_iter);
369 } else if (num == 3) {
370 switch (BIO_ADDRINFO_family(data->addr_iter)) {
373 ret = BIO_FAMILY_IPV6;
377 ret = BIO_FAMILY_IPV4;
380 ret = data->connect_family;
393 case BIO_C_SET_CONNECT:
397 char *hold_service = data->param_service;
398 /* We affect the hostname regardless. However, the input
399 * string might contain a host:service spec, so we must
400 * parse it, which might or might not affect the service
402 OPENSSL_free(data->param_hostname);
403 data->param_hostname = NULL;
404 ret = BIO_parse_hostserv(ptr,
405 &data->param_hostname,
406 &data->param_service,
407 BIO_PARSE_PRIO_HOST);
408 if (hold_service != data->param_service)
409 OPENSSL_free(hold_service);
410 } else if (num == 1) {
411 OPENSSL_free(data->param_service);
412 data->param_service = BUF_strdup(ptr);
413 } else if (num == 2) {
414 const BIO_ADDR *addr = (const BIO_ADDR *)ptr;
416 data->param_hostname = BIO_ADDR_hostname_string(addr, 1);
417 data->param_service = BIO_ADDR_service_string(addr, 1);
418 BIO_ADDRINFO_free(data->addr_first);
419 data->addr_first = NULL;
420 data->addr_iter = NULL;
422 } else if (num == 3) {
423 data->connect_family = *(int *)ptr;
431 data->connect_mode |= BIO_SOCK_NONBLOCK;
433 data->connect_mode &= ~BIO_SOCK_NONBLOCK;
435 case BIO_C_SET_CONNECT_MODE:
436 data->connect_mode = (int)num;
447 case BIO_CTRL_GET_CLOSE:
450 case BIO_CTRL_SET_CLOSE:
451 b->shutdown = (int)num;
453 case BIO_CTRL_PENDING:
454 case BIO_CTRL_WPENDING:
462 if (data->param_hostname)
463 BIO_set_conn_hostname(dbio, data->param_hostname);
464 if (data->param_service)
465 BIO_set_conn_port(dbio, data->param_service);
466 BIO_set_conn_ip_family(dbio, data->connect_family);
467 BIO_set_conn_mode(dbio, data->connect_mode);
469 * FIXME: the cast of the function seems unlikely to be a good
472 (void)BIO_set_info_callback(dbio,
473 (bio_info_cb *)data->info_callback);
476 case BIO_CTRL_SET_CALLBACK:
478 # if 0 /* FIXME: Should this be used? -- Richard
480 BIOerr(BIO_F_CONN_CTRL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
487 case BIO_CTRL_GET_CALLBACK:
489 int (**fptr) (const BIO *bio, int state, int xret);
491 fptr = (int (**)(const BIO *bio, int state, int xret))ptr;
492 *fptr = data->info_callback;
502 static long conn_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
507 data = (BIO_CONNECT *)b->ptr;
510 case BIO_CTRL_SET_CALLBACK:
512 data->info_callback =
513 (int (*)(const struct bio_st *, int, int))fp;
523 static int conn_puts(BIO *bp, const char *str)
528 ret = conn_write(bp, str, n);
532 BIO *BIO_new_connect(const char *str)
536 ret = BIO_new(BIO_s_connect());
539 if (BIO_set_conn_hostname(ret, str))