2 * Copyright 1995-2018 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 BIO_info_cb *info_callback;
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 = {
61 /* TODO: Convert to new style write function */
64 /* TODO: Convert to new style read function */
68 NULL, /* conn_gets, */
75 static int conn_state(BIO *b, BIO_CONNECT *c)
78 BIO_info_cb *cb = NULL;
80 if (c->info_callback != NULL)
81 cb = c->info_callback;
85 case BIO_CONN_S_BEFORE:
86 if (c->param_hostname == NULL && c->param_service == NULL) {
87 BIOerr(BIO_F_CONN_STATE, BIO_R_NO_HOSTNAME_OR_SERVICE_SPECIFIED);
89 "hostname=", c->param_hostname,
90 " service=", c->param_service);
93 c->state = BIO_CONN_S_GET_ADDR;
96 case BIO_CONN_S_GET_ADDR:
98 int family = AF_UNSPEC;
99 switch (c->connect_family) {
100 case BIO_FAMILY_IPV6:
101 if (1) { /* This is a trick we use to avoid bit rot.
102 * at least the "else" part will always be
109 BIOerr(BIO_F_CONN_STATE, BIO_R_UNAVAILABLE_IP_FAMILY);
113 case BIO_FAMILY_IPV4:
116 case BIO_FAMILY_IPANY:
120 BIOerr(BIO_F_CONN_STATE, BIO_R_UNSUPPORTED_IP_FAMILY);
123 if (BIO_lookup(c->param_hostname, c->param_service,
125 family, SOCK_STREAM, &c->addr_first) == 0)
128 if (c->addr_first == NULL) {
129 BIOerr(BIO_F_CONN_STATE, BIO_R_LOOKUP_RETURNED_NOTHING);
132 c->addr_iter = c->addr_first;
133 c->state = BIO_CONN_S_CREATE_SOCKET;
136 case BIO_CONN_S_CREATE_SOCKET:
137 ret = BIO_socket(BIO_ADDRINFO_family(c->addr_iter),
138 BIO_ADDRINFO_socktype(c->addr_iter),
139 BIO_ADDRINFO_protocol(c->addr_iter), 0);
140 if (ret == (int)INVALID_SOCKET) {
141 SYSerr(SYS_F_SOCKET, get_last_socket_error());
142 ERR_add_error_data(4,
143 "hostname=", c->param_hostname,
144 " service=", c->param_service);
145 BIOerr(BIO_F_CONN_STATE, BIO_R_UNABLE_TO_CREATE_SOCKET);
149 c->state = BIO_CONN_S_CONNECT;
152 case BIO_CONN_S_CONNECT:
153 BIO_clear_retry_flags(b);
154 ret = BIO_connect(b->num, BIO_ADDRINFO_address(c->addr_iter),
155 BIO_SOCK_KEEPALIVE | c->connect_mode);
158 if (BIO_sock_should_retry(ret)) {
159 BIO_set_retry_special(b);
160 c->state = BIO_CONN_S_BLOCKED_CONNECT;
161 b->retry_reason = BIO_RR_CONNECT;
163 } else if ((c->addr_iter = BIO_ADDRINFO_next(c->addr_iter))
166 * if there are more addresses to try, do that first
168 BIO_closesocket(b->num);
169 c->state = BIO_CONN_S_CREATE_SOCKET;
173 SYSerr(SYS_F_CONNECT, get_last_socket_error());
174 ERR_add_error_data(4,
175 "hostname=", c->param_hostname,
176 " service=", c->param_service);
177 BIOerr(BIO_F_CONN_STATE, BIO_R_CONNECT_ERROR);
181 c->state = BIO_CONN_S_OK;
185 case BIO_CONN_S_BLOCKED_CONNECT:
186 i = BIO_sock_error(b->num);
188 BIO_clear_retry_flags(b);
189 SYSerr(SYS_F_CONNECT, i);
190 ERR_add_error_data(4,
191 "hostname=", c->param_hostname,
192 " service=", c->param_service);
193 BIOerr(BIO_F_CONN_STATE, BIO_R_NBIO_CONNECT_ERROR);
197 c->state = BIO_CONN_S_OK;
209 if ((ret = cb((BIO *)b, c->state, ret)) == 0)
214 /* Loop does not exit */
217 ret = cb((BIO *)b, c->state, ret);
222 BIO_CONNECT *BIO_CONNECT_new(void)
226 if ((ret = OPENSSL_zalloc(sizeof(*ret))) == NULL)
228 ret->state = BIO_CONN_S_BEFORE;
229 ret->connect_family = BIO_FAMILY_IPANY;
233 void BIO_CONNECT_free(BIO_CONNECT *a)
237 OPENSSL_free(a->param_hostname);
238 OPENSSL_free(a->param_service);
239 BIO_ADDRINFO_free(a->addr_first);
243 const BIO_METHOD *BIO_s_connect(void)
245 return &methods_connectp;
248 static int conn_new(BIO *bi)
251 bi->num = (int)INVALID_SOCKET;
253 if ((bi->ptr = (char *)BIO_CONNECT_new()) == NULL)
259 static void conn_close_socket(BIO *bio)
263 c = (BIO_CONNECT *)bio->ptr;
264 if (bio->num != (int)INVALID_SOCKET) {
265 /* Only do a shutdown if things were established */
266 if (c->state == BIO_CONN_S_OK)
267 shutdown(bio->num, 2);
268 BIO_closesocket(bio->num);
269 bio->num = (int)INVALID_SOCKET;
273 static int conn_free(BIO *a)
279 data = (BIO_CONNECT *)a->ptr;
282 conn_close_socket(a);
283 BIO_CONNECT_free(data);
291 static int conn_read(BIO *b, char *out, int outl)
296 data = (BIO_CONNECT *)b->ptr;
297 if (data->state != BIO_CONN_S_OK) {
298 ret = conn_state(b, data);
304 clear_socket_error();
305 ret = readsocket(b->num, out, outl);
306 BIO_clear_retry_flags(b);
308 if (BIO_sock_should_retry(ret))
309 BIO_set_retry_read(b);
315 static int conn_write(BIO *b, const char *in, int inl)
320 data = (BIO_CONNECT *)b->ptr;
321 if (data->state != BIO_CONN_S_OK) {
322 ret = conn_state(b, data);
327 clear_socket_error();
328 ret = writesocket(b->num, in, inl);
329 BIO_clear_retry_flags(b);
331 if (BIO_sock_should_retry(ret))
332 BIO_set_retry_write(b);
337 static long conn_ctrl(BIO *b, int cmd, long num, void *ptr)
341 const char **pptr = NULL;
345 data = (BIO_CONNECT *)b->ptr;
350 data->state = BIO_CONN_S_BEFORE;
351 conn_close_socket(b);
352 BIO_ADDRINFO_free(data->addr_first);
353 data->addr_first = NULL;
356 case BIO_C_DO_STATE_MACHINE:
357 /* use this one to start the connection */
358 if (data->state != BIO_CONN_S_OK)
359 ret = (long)conn_state(b, data);
363 case BIO_C_GET_CONNECT:
365 pptr = (const char **)ptr;
367 *pptr = data->param_hostname;
368 } else if (num == 1) {
369 *pptr = data->param_service;
370 } else if (num == 2) {
371 *pptr = (const char *)BIO_ADDRINFO_address(data->addr_iter);
372 } else if (num == 3) {
373 switch (BIO_ADDRINFO_family(data->addr_iter)) {
376 ret = BIO_FAMILY_IPV6;
380 ret = BIO_FAMILY_IPV4;
383 ret = data->connect_family;
396 case BIO_C_SET_CONNECT:
400 char *hold_service = data->param_service;
401 /* We affect the hostname regardless. However, the input
402 * string might contain a host:service spec, so we must
403 * parse it, which might or might not affect the service
405 OPENSSL_free(data->param_hostname);
406 data->param_hostname = NULL;
407 ret = BIO_parse_hostserv(ptr,
408 &data->param_hostname,
409 &data->param_service,
410 BIO_PARSE_PRIO_HOST);
411 if (hold_service != data->param_service)
412 OPENSSL_free(hold_service);
413 } else if (num == 1) {
414 OPENSSL_free(data->param_service);
415 data->param_service = BUF_strdup(ptr);
416 } else if (num == 2) {
417 const BIO_ADDR *addr = (const BIO_ADDR *)ptr;
419 data->param_hostname = BIO_ADDR_hostname_string(addr, 1);
420 data->param_service = BIO_ADDR_service_string(addr, 1);
421 BIO_ADDRINFO_free(data->addr_first);
422 data->addr_first = NULL;
423 data->addr_iter = NULL;
425 } else if (num == 3) {
426 data->connect_family = *(int *)ptr;
434 data->connect_mode |= BIO_SOCK_NONBLOCK;
436 data->connect_mode &= ~BIO_SOCK_NONBLOCK;
438 case BIO_C_SET_CONNECT_MODE:
439 data->connect_mode = (int)num;
450 case BIO_CTRL_GET_CLOSE:
453 case BIO_CTRL_SET_CLOSE:
454 b->shutdown = (int)num;
456 case BIO_CTRL_PENDING:
457 case BIO_CTRL_WPENDING:
465 if (data->param_hostname)
466 BIO_set_conn_hostname(dbio, data->param_hostname);
467 if (data->param_service)
468 BIO_set_conn_port(dbio, data->param_service);
469 BIO_set_conn_ip_family(dbio, data->connect_family);
470 BIO_set_conn_mode(dbio, data->connect_mode);
472 * FIXME: the cast of the function seems unlikely to be a good
475 (void)BIO_set_info_callback(dbio, data->info_callback);
478 case BIO_CTRL_SET_CALLBACK:
479 ret = 0; /* use callback ctrl */
481 case BIO_CTRL_GET_CALLBACK:
485 fptr = (BIO_info_cb **)ptr;
486 *fptr = data->info_callback;
496 static long conn_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
501 data = (BIO_CONNECT *)b->ptr;
504 case BIO_CTRL_SET_CALLBACK:
506 data->info_callback = fp;
516 static int conn_puts(BIO *bp, const char *str)
521 ret = conn_write(bp, str, n);
525 BIO *BIO_new_connect(const char *str)
529 ret = BIO_new(BIO_s_connect());
532 if (BIO_set_conn_hostname(ret, str))