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1 | .\" $OpenBSD: BIO_s_connect.3,v 1.19 2023/04/30 13:53:54 schwarze Exp $ | ||
2 | .\" full merge up to: OpenSSL 0e474b8b Nov 1 15:45:49 2015 +0100 | ||
3 | .\" | ||
4 | .\" This file is a derived work. | ||
5 | .\" The changes are covered by the following Copyright and license: | ||
6 | .\" | ||
7 | .\" Copyright (c) 2023 Ingo Schwarze <schwarze@openbsd.org> | ||
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14 | .\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | ||
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68 | .Dd $Mdocdate: April 30 2023 $ | ||
69 | .Dt BIO_S_CONNECT 3 | ||
70 | .Os | ||
71 | .Sh NAME | ||
72 | .Nm BIO_s_connect , | ||
73 | .Nm BIO_new_connect , | ||
74 | .Nm BIO_set_conn_hostname , | ||
75 | .Nm BIO_set_conn_port , | ||
76 | .Nm BIO_set_conn_ip , | ||
77 | .Nm BIO_set_conn_int_port , | ||
78 | .Nm BIO_get_conn_hostname , | ||
79 | .Nm BIO_get_conn_port , | ||
80 | .Nm BIO_get_conn_ip , | ||
81 | .Nm BIO_get_conn_int_port , | ||
82 | .Nm BIO_set_nbio , | ||
83 | .Nm BIO_do_connect | ||
84 | .Nd connect BIO | ||
85 | .Sh SYNOPSIS | ||
86 | .In openssl/bio.h | ||
87 | .Ft const BIO_METHOD * | ||
88 | .Fo BIO_s_connect | ||
89 | .Fa void | ||
90 | .Fc | ||
91 | .Ft BIO * | ||
92 | .Fo BIO_new_connect | ||
93 | .Fa "const char *name" | ||
94 | .Fc | ||
95 | .Ft long | ||
96 | .Fo BIO_set_conn_hostname | ||
97 | .Fa "BIO *b" | ||
98 | .Fa "char *name" | ||
99 | .Fc | ||
100 | .Ft long | ||
101 | .Fo BIO_set_conn_port | ||
102 | .Fa "BIO *b" | ||
103 | .Fa "char *port" | ||
104 | .Fc | ||
105 | .Ft long | ||
106 | .Fo BIO_set_conn_ip | ||
107 | .Fa "BIO *b" | ||
108 | .Fa "char *ip" | ||
109 | .Fc | ||
110 | .Ft long | ||
111 | .Fo BIO_set_conn_int_port | ||
112 | .Fa "BIO *b" | ||
113 | .Fa "char *port" | ||
114 | .Fc | ||
115 | .Ft char * | ||
116 | .Fo BIO_get_conn_hostname | ||
117 | .Fa "BIO *b" | ||
118 | .Fc | ||
119 | .Ft char * | ||
120 | .Fo BIO_get_conn_port | ||
121 | .Fa "BIO *b" | ||
122 | .Fc | ||
123 | .Ft char * | ||
124 | .Fo BIO_get_conn_ip | ||
125 | .Fa "BIO *b" | ||
126 | .Fc | ||
127 | .Ft long | ||
128 | .Fo BIO_get_conn_int_port | ||
129 | .Fa "BIO *b" | ||
130 | .Fc | ||
131 | .Ft long | ||
132 | .Fo BIO_set_nbio | ||
133 | .Fa "BIO *b" | ||
134 | .Fa "long n" | ||
135 | .Fc | ||
136 | .Ft long | ||
137 | .Fo BIO_do_connect | ||
138 | .Fa "BIO *b" | ||
139 | .Fc | ||
140 | .Sh DESCRIPTION | ||
141 | .Fn BIO_s_connect | ||
142 | returns the connect BIO method. | ||
143 | This is a wrapper around the platform's TCP/IP socket connection routines. | ||
144 | .Pp | ||
145 | Using connect BIOs, TCP/IP connections can be made and data | ||
146 | transferred using only BIO routines. | ||
147 | In this way any platform specific operations | ||
148 | are hidden by the BIO abstraction. | ||
149 | .Pp | ||
150 | Read and write operations on a connect BIO will perform I/O | ||
151 | on the underlying connection. | ||
152 | If no connection is established and the port and hostname (see below) | ||
153 | is set up properly, then a connection is established first. | ||
154 | .Pp | ||
155 | Connect BIOs support | ||
156 | .Xr BIO_puts 3 | ||
157 | but not | ||
158 | .Xr BIO_gets 3 . | ||
159 | .Pp | ||
160 | If the close flag is set on a connect BIO, then any active connection | ||
161 | is shutdown and the socket closed when the BIO is freed. | ||
162 | .Pp | ||
163 | Calling | ||
164 | .Xr BIO_reset 3 | ||
165 | on a connect BIO will close any active connection and reset the BIO | ||
166 | into a state where it can connect to the same host again. | ||
167 | .Pp | ||
168 | .Xr BIO_get_fd 3 | ||
169 | places the underlying socket in | ||
170 | .Fa c | ||
171 | if it is not | ||
172 | .Dv NULL | ||
173 | and also returns the socket. | ||
174 | If | ||
175 | .Fa c | ||
176 | is not | ||
177 | .Dv NULL , | ||
178 | it should be of type | ||
179 | .Vt "int *" . | ||
180 | .Pp | ||
181 | .Xr BIO_set_info_callback 3 | ||
182 | and | ||
183 | .Xr BIO_callback_ctrl 3 | ||
184 | with a | ||
185 | .Fa cmd | ||
186 | of | ||
187 | .Dv BIO_CTRL_SET_CALLBACK | ||
188 | save the pointer to the | ||
189 | .Fa cb | ||
190 | function internally in | ||
191 | .Fa b | ||
192 | and | ||
193 | .Xr BIO_get_info_callback 3 | ||
194 | retrieves this function pointer. | ||
195 | If such an info callback is installed, it is invoked whenever | ||
196 | a state change or error occurs in the connect BIO state machine. | ||
197 | The arguments of the callback include the new | ||
198 | .Fa state | ||
199 | in case of a state change or the old | ||
200 | .Fa state | ||
201 | in case of an error and the value | ||
202 | .Fa res | ||
203 | that the state machine would return to whatever operation invoked it | ||
204 | if no info callback had been installed. | ||
205 | If an info callback is installed, the state machine | ||
206 | returns the return value of the info callback instead. | ||
207 | Consequently, the info callback is supposed to usually return | ||
208 | .Fa res . | ||
209 | The precise effect of the return value depends on which operation | ||
210 | the state machine was invoked from. | ||
211 | Usually, \-1 is used to indicate failure and return values less than | ||
212 | or equal to zero abort the operation in question, whereas positive | ||
213 | values indicate success and allow the operation to proceed. | ||
214 | .Pp | ||
215 | The | ||
216 | .Fa state | ||
217 | constants passed to the callback are named according to | ||
218 | which operation needs to be performed next. | ||
219 | They are listed here in the order the states are passed through: | ||
220 | .Pp | ||
221 | .Bl -tag -width BIO_CONN_S_BLOCKED_CONNECT -offset 3n -compact | ||
222 | .It Dv BIO_CONN_S_BEFORE | ||
223 | The BIO is idle and no connection has been initiated yet. | ||
224 | .It Dv BIO_CONN_S_GET_IP | ||
225 | The hostname to connect to needs to be converted to an IP address. | ||
226 | .It Dv BIO_CONN_S_GET_PORT | ||
227 | The service name to connect to needs to be converted to a TCP port number. | ||
228 | .It Dv BIO_CONN_S_CREATE_SOCKET | ||
229 | The TCP socket needs to be created with the | ||
230 | .Xr socket 2 | ||
231 | system call. | ||
232 | .It Dv BIO_CONN_S_NBIO | ||
233 | Socket options may need to be set using | ||
234 | .Xr fcntl 2 | ||
235 | and | ||
236 | .Xr setsockopt 2 . | ||
237 | .It Dv BIO_CONN_S_CONNECT | ||
238 | The connection needs to be initiated with the | ||
239 | .Xr connect 2 | ||
240 | system call. | ||
241 | .It Dv BIO_CONN_S_BLOCKED_CONNECT | ||
242 | The | ||
243 | .Xr connect 2 | ||
244 | system call would have blocked and needs to be tried again. | ||
245 | .It Dv BIO_CONN_S_OK | ||
246 | The connection has been established and can now be used to transfer data. | ||
247 | .El | ||
248 | .Pp | ||
249 | .Fn BIO_set_conn_hostname | ||
250 | uses the string | ||
251 | .Fa name | ||
252 | to set the hostname. | ||
253 | The hostname can be an IP address. | ||
254 | The hostname can also include the port in the form | ||
255 | .Ar hostname : Ns Ar port . | ||
256 | It is also acceptable to use the forms | ||
257 | .Ar hostname Ns / Ns Pa any/other/path | ||
258 | or | ||
259 | .Ar hostname : Ns Ar port Ns / Ns Pa any/other/path . | ||
260 | .Pp | ||
261 | .Fn BIO_set_conn_port | ||
262 | sets the port to | ||
263 | .Fa port . | ||
264 | .Fa port | ||
265 | is looked up as a service using | ||
266 | .Xr getaddrinfo 3 . | ||
267 | .Pp | ||
268 | .Fn BIO_set_conn_ip | ||
269 | sets the IP address to | ||
270 | .Fa ip | ||
271 | using binary form i.e. four bytes specifying the IP address | ||
272 | in big-endian form. | ||
273 | .Pp | ||
274 | .Fn BIO_set_conn_int_port | ||
275 | sets the port using | ||
276 | .Fa port . | ||
277 | .Fa port | ||
278 | should | ||
279 | be of type | ||
280 | .Vt "int *" . | ||
281 | .Pp | ||
282 | .Fn BIO_get_conn_hostname | ||
283 | returns the hostname of the connect BIO or | ||
284 | .Dv NULL | ||
285 | if the BIO is initialized but no hostname is set. | ||
286 | This return value is an internal pointer which should not be modified. | ||
287 | .Pp | ||
288 | .Fn BIO_get_conn_port | ||
289 | returns the port as a string. | ||
290 | This return value is an internal pointer which should not be modified. | ||
291 | .Pp | ||
292 | .Fn BIO_get_conn_ip | ||
293 | returns the IP address in binary form. | ||
294 | .Pp | ||
295 | .Fn BIO_get_conn_int_port | ||
296 | returns the port as an | ||
297 | .Vt int . | ||
298 | .Pp | ||
299 | .Fn BIO_set_nbio | ||
300 | sets the non-blocking I/O flag to | ||
301 | .Fa n . | ||
302 | If | ||
303 | .Fa n | ||
304 | is zero then blocking I/O is set. | ||
305 | If | ||
306 | .Fa n | ||
307 | is 1 then non-blocking I/O is set. | ||
308 | Blocking I/O is the default. | ||
309 | The call to | ||
310 | .Fn BIO_set_nbio | ||
311 | should be made before the connection is established | ||
312 | because non-blocking I/O is set during the connect process. | ||
313 | .Pp | ||
314 | .Fn BIO_new_connect | ||
315 | combines | ||
316 | .Xr BIO_new 3 | ||
317 | and | ||
318 | .Fn BIO_set_conn_hostname | ||
319 | into a single call. | ||
320 | It creates a new connect BIO with | ||
321 | .Fa name . | ||
322 | .Pp | ||
323 | .Fn BIO_do_connect | ||
324 | attempts to connect the supplied BIO. | ||
325 | It returns 1 if the connection was established successfully. | ||
326 | A zero or negative value is returned if the connection | ||
327 | could not be established. | ||
328 | The call | ||
329 | .Xr BIO_should_retry 3 | ||
330 | should be used for non-blocking connect BIOs | ||
331 | to determine if the call should be retried. | ||
332 | .Pp | ||
333 | If blocking I/O is set then a non-positive return value from any | ||
334 | I/O call is caused by an error condition, although a zero return | ||
335 | will normally mean that the connection was closed. | ||
336 | .Pp | ||
337 | If the port name is supplied as part of the host name then this will | ||
338 | override any value set with | ||
339 | .Fn BIO_set_conn_port . | ||
340 | This may be undesirable if the application does not wish to allow | ||
341 | connection to arbitrary ports. | ||
342 | This can be avoided by checking for the presence of the | ||
343 | .Sq \&: | ||
344 | character in the passed hostname and either indicating an error | ||
345 | or truncating the string at that point. | ||
346 | .Pp | ||
347 | The values returned by | ||
348 | .Fn BIO_get_conn_hostname , | ||
349 | .Fn BIO_get_conn_port , | ||
350 | .Fn BIO_get_conn_ip , | ||
351 | and | ||
352 | .Fn BIO_get_conn_int_port | ||
353 | are updated when a connection attempt is made. | ||
354 | Before any connection attempt the values returned | ||
355 | are those set by the application itself. | ||
356 | .Pp | ||
357 | Applications do not have to call | ||
358 | .Fn BIO_do_connect | ||
359 | but may wish to do so to separate the connection process | ||
360 | from other I/O processing. | ||
361 | .Pp | ||
362 | If non-blocking I/O is set, | ||
363 | then retries will be requested as appropriate. | ||
364 | .Pp | ||
365 | In addition to | ||
366 | .Xr BIO_should_read 3 | ||
367 | and | ||
368 | .Xr BIO_should_write 3 | ||
369 | it is also possible for | ||
370 | .Xr BIO_should_io_special 3 | ||
371 | to be true during the initial connection process with the reason | ||
372 | .Dv BIO_RR_CONNECT . | ||
373 | If this is returned, it is an indication | ||
374 | that a connection attempt would block. | ||
375 | The application should then take appropriate action to wait | ||
376 | until the underlying socket has connected and retry the call. | ||
377 | .Pp | ||
378 | When a chain containing a connect BIO is copied with | ||
379 | .Xr BIO_dup_chain 3 , | ||
380 | .Fn BIO_set_conn_hostname , | ||
381 | .Fn BIO_set_conn_port , | ||
382 | .Fn BIO_set_nbio , | ||
383 | and | ||
384 | .Xr BIO_set_info_callback 3 | ||
385 | are called internally to automatically copy the hostname, port, | ||
386 | non-blocking I/O flag, and info callback from the original BIO object | ||
387 | to the new one. | ||
388 | .Pp | ||
389 | .Xr BIO_ctrl 3 | ||
390 | .Fa cmd | ||
391 | and | ||
392 | .Fa larg | ||
393 | arguments correspond to macros as follows: | ||
394 | .Bl -column BIO_C_DO_STATE_MACHINE larg BIO_get_conn_hostname(3) -offset 3n | ||
395 | .It Fa cmd No constant Ta Fa larg Ta corresponding macro | ||
396 | .It Dv BIO_C_DO_STATE_MACHINE Ta 0 Ta Fn BIO_do_connect | ||
397 | .It Dv BIO_C_GET_CONNECT Ta 0 Ta Fn BIO_get_conn_hostname | ||
398 | .It Ta 1 Ta Fn BIO_get_conn_port | ||
399 | .It Ta 2 Ta Fn BIO_get_conn_ip | ||
400 | .It Ta 3 Ta Fn BIO_get_conn_int_port | ||
401 | .It Dv BIO_C_GET_FD Ta 0 Ta Xr BIO_get_fd 3 | ||
402 | .It Dv BIO_C_SET_CONNECT Ta 0 Ta Fn BIO_set_conn_hostname | ||
403 | .It Ta 1 Ta Fn BIO_set_conn_port | ||
404 | .It Ta 2 Ta Fn BIO_set_conn_ip | ||
405 | .It Ta 3 Ta Fn BIO_set_conn_int_port | ||
406 | .It Dv BIO_C_SET_NBIO Ta Fa n Ta Fn BIO_set_nbio | ||
407 | .It Dv BIO_CTRL_GET_CLOSE Ta 0 Ta Xr BIO_get_close 3 | ||
408 | .It Dv BIO_CTRL_RESET Ta 0 Ta Xr BIO_reset 3 | ||
409 | .It Dv BIO_CTRL_SET_CLOSE Ta Fa flag Ta Xr BIO_set_close 3 | ||
410 | .El | ||
411 | .Sh RETURN VALUES | ||
412 | .Fn BIO_s_connect | ||
413 | returns the connect BIO method. | ||
414 | .Pp | ||
415 | When called on a connect BIO object, | ||
416 | .Xr BIO_method_type 3 | ||
417 | returns the constant | ||
418 | .Dv BIO_TYPE_CONNECT | ||
419 | and | ||
420 | .Xr BIO_method_name 3 | ||
421 | returns a pointer to the static string | ||
422 | .Qq socket connect . | ||
423 | .Pp | ||
424 | .Xr BIO_get_fd 3 | ||
425 | returns the socket or -1 if the BIO has not been initialized. | ||
426 | .Pp | ||
427 | .Fn BIO_set_conn_hostname , | ||
428 | .Fn BIO_set_conn_port , | ||
429 | .Fn BIO_set_conn_ip , | ||
430 | and | ||
431 | .Fn BIO_set_conn_int_port | ||
432 | always return 1. | ||
433 | .Pp | ||
434 | .Fn BIO_get_conn_hostname | ||
435 | returns the connected hostname or | ||
436 | .Dv NULL | ||
437 | if none is set. | ||
438 | .Pp | ||
439 | .Fn BIO_get_conn_port | ||
440 | returns a string representing the connected port or | ||
441 | .Dv NULL | ||
442 | if not set. | ||
443 | .Pp | ||
444 | .Fn BIO_get_conn_ip | ||
445 | returns a pointer to the connected IP address in binary form | ||
446 | or all zeros if not set. | ||
447 | .Pp | ||
448 | .Fn BIO_get_conn_int_port | ||
449 | returns the connected port or 0 if none was set. | ||
450 | .Pp | ||
451 | .Fn BIO_set_nbio | ||
452 | always returns 1. | ||
453 | .Pp | ||
454 | .Fn BIO_do_connect | ||
455 | returns 1 if the connection was successfully | ||
456 | established and 0 or -1 if the connection failed. | ||
457 | .Sh EXAMPLES | ||
458 | This example connects to a webserver on the local host and attempts | ||
459 | to retrieve a page and copy the result to standard output. | ||
460 | .Bd -literal -offset 2n | ||
461 | BIO *cbio, *out; | ||
462 | int len; | ||
463 | char tmpbuf[1024]; | ||
464 | |||
465 | ERR_load_crypto_strings(); | ||
466 | cbio = BIO_new_connect("localhost:http"); | ||
467 | out = BIO_new_fp(stdout, BIO_NOCLOSE); | ||
468 | if (BIO_do_connect(cbio) <= 0) { | ||
469 | fprintf(stderr, "Error connecting to server\en"); | ||
470 | ERR_print_errors_fp(stderr); | ||
471 | /* whatever ... */ | ||
472 | } | ||
473 | BIO_puts(cbio, "GET / HTTP/1.0\en\en"); | ||
474 | for(;;) { | ||
475 | len = BIO_read(cbio, tmpbuf, 1024); | ||
476 | if (len <= 0) | ||
477 | break; | ||
478 | BIO_write(out, tmpbuf, len); | ||
479 | } | ||
480 | BIO_free(cbio); | ||
481 | BIO_free(out); | ||
482 | .Ed | ||
483 | .Sh SEE ALSO | ||
484 | .Xr BIO_new 3 | ||
485 | .Sh HISTORY | ||
486 | .Fn BIO_s_connect , | ||
487 | .Fn BIO_new_connect , | ||
488 | .Fn BIO_set_nbio , | ||
489 | and | ||
490 | .Fn BIO_do_connect | ||
491 | first appeared in SSLeay 0.8.0. | ||
492 | .Fn BIO_set_conn_hostname , | ||
493 | .Fn BIO_set_conn_port , | ||
494 | .Fn BIO_set_conn_ip , | ||
495 | .Fn BIO_set_conn_int_port , | ||
496 | .Fn BIO_get_conn_hostname , | ||
497 | .Fn BIO_get_conn_port , | ||
498 | .Fn BIO_get_conn_ip , | ||
499 | and | ||
500 | .Fn BIO_get_conn_int_port | ||
501 | first appeared in SSLeay 0.9.0. | ||
502 | All these functions have been available since | ||
503 | .Ox 2.4 . | ||