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129.\" ========================================================================
130.\"
131.IX Title "BIO_s_accept 3"
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124.\" ========================================================================
125.\"
126.IX Title "BIO_s_accept 3"
|
132.TH BIO_s_accept 3 "2010-03-24" "0.9.8n" "OpenSSL"
| 127.TH BIO_s_accept 3 "2010-11-16" "0.9.8p" "OpenSSL"
128.\" For nroff, turn off justification. Always turn off hyphenation; it makes
129.\" way too many mistakes in technical documents.
130.if n .ad l
131.nh
|
133.SH "NAME"
134BIO_s_accept, BIO_set_accept_port, BIO_get_accept_port,
135BIO_set_nbio_accept, BIO_set_accept_bios, BIO_set_bind_mode,
136BIO_get_bind_mode, BIO_do_accept \- accept BIO
137.SH "SYNOPSIS"
138.IX Header "SYNOPSIS"
139.Vb 1
140\& #include <openssl/bio.h>
| 132.SH "NAME"
133BIO_s_accept, BIO_set_accept_port, BIO_get_accept_port,
134BIO_set_nbio_accept, BIO_set_accept_bios, BIO_set_bind_mode,
135BIO_get_bind_mode, BIO_do_accept \- accept BIO
136.SH "SYNOPSIS"
137.IX Header "SYNOPSIS"
138.Vb 1
139\& #include <openssl/bio.h>
|
141.Ve
142.PP
143.Vb 1
| 140\&
|
144\& BIO_METHOD *BIO_s_accept(void);
| 141\& BIO_METHOD *BIO_s_accept(void);
|
145.Ve
146.PP
147.Vb 2
| 142\&
|
148\& long BIO_set_accept_port(BIO *b, char *name);
149\& char *BIO_get_accept_port(BIO *b);
| 143\& long BIO_set_accept_port(BIO *b, char *name);
144\& char *BIO_get_accept_port(BIO *b);
|
150.Ve
151.PP
152.Vb 1
| 145\&
|
153\& BIO *BIO_new_accept(char *host_port);
| 146\& BIO *BIO_new_accept(char *host_port);
|
154.Ve
155.PP
156.Vb 2
| 147\&
|
157\& long BIO_set_nbio_accept(BIO *b, int n);
158\& long BIO_set_accept_bios(BIO *b, char *bio);
| 148\& long BIO_set_nbio_accept(BIO *b, int n);
149\& long BIO_set_accept_bios(BIO *b, char *bio);
|
159.Ve
160.PP
161.Vb 2
| 150\&
|
162\& long BIO_set_bind_mode(BIO *b, long mode);
163\& long BIO_get_bind_mode(BIO *b, long dummy);
| 151\& long BIO_set_bind_mode(BIO *b, long mode);
152\& long BIO_get_bind_mode(BIO *b, long dummy);
|
164.Ve
165.PP
166.Vb 3
| 153\&
|
167\& #define BIO_BIND_NORMAL 0
168\& #define BIO_BIND_REUSEADDR_IF_UNUSED 1
169\& #define BIO_BIND_REUSEADDR 2
| 154\& #define BIO_BIND_NORMAL 0
155\& #define BIO_BIND_REUSEADDR_IF_UNUSED 1
156\& #define BIO_BIND_REUSEADDR 2
|
170.Ve
171.PP
172.Vb 1
| 157\&
|
173\& int BIO_do_accept(BIO *b);
174.Ve
175.SH "DESCRIPTION"
176.IX Header "DESCRIPTION"
177\&\fIBIO_s_accept()\fR returns the accept \s-1BIO\s0 method. This is a wrapper
178round the platform's \s-1TCP/IP\s0 socket accept routines.
179.PP
180Using accept BIOs, \s-1TCP/IP\s0 connections can be accepted and data
181transferred using only \s-1BIO\s0 routines. In this way any platform
182specific operations are hidden by the \s-1BIO\s0 abstraction.
183.PP
184Read and write operations on an accept \s-1BIO\s0 will perform I/O
185on the underlying connection. If no connection is established
186and the port (see below) is set up properly then the \s-1BIO\s0
187waits for an incoming connection.
188.PP
189Accept BIOs support \fIBIO_puts()\fR but not \fIBIO_gets()\fR.
190.PP
191If the close flag is set on an accept \s-1BIO\s0 then any active
192connection on that chain is shutdown and the socket closed when
193the \s-1BIO\s0 is freed.
194.PP
195Calling \fIBIO_reset()\fR on a accept \s-1BIO\s0 will close any active
196connection and reset the \s-1BIO\s0 into a state where it awaits another
197incoming connection.
198.PP
199\&\fIBIO_get_fd()\fR and \fIBIO_set_fd()\fR can be called to retrieve or set
200the accept socket. See \fIBIO_s_fd\fR\|(3)
201.PP
202\&\fIBIO_set_accept_port()\fR uses the string \fBname\fR to set the accept
203port. The port is represented as a string of the form \*(L"host:port\*(R",
204where \*(L"host\*(R" is the interface to use and \*(L"port\*(R" is the port.
205Either or both values can be \*(L"*\*(R" which is interpreted as meaning
206any interface or port respectively. \*(L"port\*(R" has the same syntax
207as the port specified in \fIBIO_set_conn_port()\fR for connect BIOs,
208that is it can be a numerical port string or a string to lookup
209using \fIgetservbyname()\fR and a string table.
210.PP
211\&\fIBIO_new_accept()\fR combines \fIBIO_new()\fR and \fIBIO_set_accept_port()\fR into
212a single call: that is it creates a new accept \s-1BIO\s0 with port
213\&\fBhost_port\fR.
214.PP
215\&\fIBIO_set_nbio_accept()\fR sets the accept socket to blocking mode
216(the default) if \fBn\fR is 0 or non blocking mode if \fBn\fR is 1.
217.PP
218\&\fIBIO_set_accept_bios()\fR can be used to set a chain of BIOs which
219will be duplicated and prepended to the chain when an incoming
220connection is received. This is useful if, for example, a
221buffering or \s-1SSL\s0 \s-1BIO\s0 is required for each connection. The
222chain of BIOs must not be freed after this call, they will
223be automatically freed when the accept \s-1BIO\s0 is freed.
224.PP
225\&\fIBIO_set_bind_mode()\fR and \fIBIO_get_bind_mode()\fR set and retrieve
226the current bind mode. If \s-1BIO_BIND_NORMAL\s0 (the default) is set
227then another socket cannot be bound to the same port. If
228\&\s-1BIO_BIND_REUSEADDR\s0 is set then other sockets can bind to the
229same port. If \s-1BIO_BIND_REUSEADDR_IF_UNUSED\s0 is set then and
230attempt is first made to use \s-1BIO_BIN_NORMAL\s0, if this fails
231and the port is not in use then a second attempt is made
232using \s-1BIO_BIND_REUSEADDR\s0.
233.PP
234\&\fIBIO_do_accept()\fR serves two functions. When it is first
235called, after the accept \s-1BIO\s0 has been setup, it will attempt
236to create the accept socket and bind an address to it. Second
237and subsequent calls to \fIBIO_do_accept()\fR will await an incoming
238connection, or request a retry in non blocking mode.
239.SH "NOTES"
240.IX Header "NOTES"
241When an accept \s-1BIO\s0 is at the end of a chain it will await an
242incoming connection before processing I/O calls. When an accept
243\&\s-1BIO\s0 is not at then end of a chain it passes I/O calls to the next
244\&\s-1BIO\s0 in the chain.
245.PP
246When a connection is established a new socket \s-1BIO\s0 is created for
247the connection and appended to the chain. That is the chain is now
248accept\->socket. This effectively means that attempting I/O on
249an initial accept socket will await an incoming connection then
250perform I/O on it.
251.PP
252If any additional BIOs have been set using \fIBIO_set_accept_bios()\fR
253then they are placed between the socket and the accept \s-1BIO\s0,
254that is the chain will be accept\->otherbios\->socket.
255.PP
256If a server wishes to process multiple connections (as is normally
257the case) then the accept \s-1BIO\s0 must be made available for further
258incoming connections. This can be done by waiting for a connection and
259then calling:
260.PP
261.Vb 1
262\& connection = BIO_pop(accept);
263.Ve
264.PP
265After this call \fBconnection\fR will contain a \s-1BIO\s0 for the recently
266established connection and \fBaccept\fR will now be a single \s-1BIO\s0
267again which can be used to await further incoming connections.
268If no further connections will be accepted the \fBaccept\fR can
269be freed using \fIBIO_free()\fR.
270.PP
271If only a single connection will be processed it is possible to
272perform I/O using the accept \s-1BIO\s0 itself. This is often undesirable
273however because the accept \s-1BIO\s0 will still accept additional incoming
274connections. This can be resolved by using \fIBIO_pop()\fR (see above)
275and freeing up the accept \s-1BIO\s0 after the initial connection.
276.PP
277If the underlying accept socket is non-blocking and \fIBIO_do_accept()\fR is
278called to await an incoming connection it is possible for
279\&\fIBIO_should_io_special()\fR with the reason \s-1BIO_RR_ACCEPT\s0. If this happens
280then it is an indication that an accept attempt would block: the application
281should take appropriate action to wait until the underlying socket has
282accepted a connection and retry the call.
283.PP
284\&\fIBIO_set_accept_port()\fR, \fIBIO_get_accept_port()\fR, \fIBIO_set_nbio_accept()\fR,
285\&\fIBIO_set_accept_bios()\fR, \fIBIO_set_bind_mode()\fR, \fIBIO_get_bind_mode()\fR and
286\&\fIBIO_do_accept()\fR are macros.
287.SH "RETURN VALUES"
288.IX Header "RETURN VALUES"
289\&\s-1TBA\s0
290.SH "EXAMPLE"
291.IX Header "EXAMPLE"
292This example accepts two connections on port 4444, sends messages
293down each and finally closes both down.
294.PP
295.Vb 3
296\& BIO *abio, *cbio, *cbio2;
297\& ERR_load_crypto_strings();
298\& abio = BIO_new_accept("4444");
| 158\& int BIO_do_accept(BIO *b);
159.Ve
160.SH "DESCRIPTION"
161.IX Header "DESCRIPTION"
162\&\fIBIO_s_accept()\fR returns the accept \s-1BIO\s0 method. This is a wrapper
163round the platform's \s-1TCP/IP\s0 socket accept routines.
164.PP
165Using accept BIOs, \s-1TCP/IP\s0 connections can be accepted and data
166transferred using only \s-1BIO\s0 routines. In this way any platform
167specific operations are hidden by the \s-1BIO\s0 abstraction.
168.PP
169Read and write operations on an accept \s-1BIO\s0 will perform I/O
170on the underlying connection. If no connection is established
171and the port (see below) is set up properly then the \s-1BIO\s0
172waits for an incoming connection.
173.PP
174Accept BIOs support \fIBIO_puts()\fR but not \fIBIO_gets()\fR.
175.PP
176If the close flag is set on an accept \s-1BIO\s0 then any active
177connection on that chain is shutdown and the socket closed when
178the \s-1BIO\s0 is freed.
179.PP
180Calling \fIBIO_reset()\fR on a accept \s-1BIO\s0 will close any active
181connection and reset the \s-1BIO\s0 into a state where it awaits another
182incoming connection.
183.PP
184\&\fIBIO_get_fd()\fR and \fIBIO_set_fd()\fR can be called to retrieve or set
185the accept socket. See \fIBIO_s_fd\fR\|(3)
186.PP
187\&\fIBIO_set_accept_port()\fR uses the string \fBname\fR to set the accept
188port. The port is represented as a string of the form \*(L"host:port\*(R",
189where \*(L"host\*(R" is the interface to use and \*(L"port\*(R" is the port.
190Either or both values can be \*(L"*\*(R" which is interpreted as meaning
191any interface or port respectively. \*(L"port\*(R" has the same syntax
192as the port specified in \fIBIO_set_conn_port()\fR for connect BIOs,
193that is it can be a numerical port string or a string to lookup
194using \fIgetservbyname()\fR and a string table.
195.PP
196\&\fIBIO_new_accept()\fR combines \fIBIO_new()\fR and \fIBIO_set_accept_port()\fR into
197a single call: that is it creates a new accept \s-1BIO\s0 with port
198\&\fBhost_port\fR.
199.PP
200\&\fIBIO_set_nbio_accept()\fR sets the accept socket to blocking mode
201(the default) if \fBn\fR is 0 or non blocking mode if \fBn\fR is 1.
202.PP
203\&\fIBIO_set_accept_bios()\fR can be used to set a chain of BIOs which
204will be duplicated and prepended to the chain when an incoming
205connection is received. This is useful if, for example, a
206buffering or \s-1SSL\s0 \s-1BIO\s0 is required for each connection. The
207chain of BIOs must not be freed after this call, they will
208be automatically freed when the accept \s-1BIO\s0 is freed.
209.PP
210\&\fIBIO_set_bind_mode()\fR and \fIBIO_get_bind_mode()\fR set and retrieve
211the current bind mode. If \s-1BIO_BIND_NORMAL\s0 (the default) is set
212then another socket cannot be bound to the same port. If
213\&\s-1BIO_BIND_REUSEADDR\s0 is set then other sockets can bind to the
214same port. If \s-1BIO_BIND_REUSEADDR_IF_UNUSED\s0 is set then and
215attempt is first made to use \s-1BIO_BIN_NORMAL\s0, if this fails
216and the port is not in use then a second attempt is made
217using \s-1BIO_BIND_REUSEADDR\s0.
218.PP
219\&\fIBIO_do_accept()\fR serves two functions. When it is first
220called, after the accept \s-1BIO\s0 has been setup, it will attempt
221to create the accept socket and bind an address to it. Second
222and subsequent calls to \fIBIO_do_accept()\fR will await an incoming
223connection, or request a retry in non blocking mode.
224.SH "NOTES"
225.IX Header "NOTES"
226When an accept \s-1BIO\s0 is at the end of a chain it will await an
227incoming connection before processing I/O calls. When an accept
228\&\s-1BIO\s0 is not at then end of a chain it passes I/O calls to the next
229\&\s-1BIO\s0 in the chain.
230.PP
231When a connection is established a new socket \s-1BIO\s0 is created for
232the connection and appended to the chain. That is the chain is now
233accept\->socket. This effectively means that attempting I/O on
234an initial accept socket will await an incoming connection then
235perform I/O on it.
236.PP
237If any additional BIOs have been set using \fIBIO_set_accept_bios()\fR
238then they are placed between the socket and the accept \s-1BIO\s0,
239that is the chain will be accept\->otherbios\->socket.
240.PP
241If a server wishes to process multiple connections (as is normally
242the case) then the accept \s-1BIO\s0 must be made available for further
243incoming connections. This can be done by waiting for a connection and
244then calling:
245.PP
246.Vb 1
247\& connection = BIO_pop(accept);
248.Ve
249.PP
250After this call \fBconnection\fR will contain a \s-1BIO\s0 for the recently
251established connection and \fBaccept\fR will now be a single \s-1BIO\s0
252again which can be used to await further incoming connections.
253If no further connections will be accepted the \fBaccept\fR can
254be freed using \fIBIO_free()\fR.
255.PP
256If only a single connection will be processed it is possible to
257perform I/O using the accept \s-1BIO\s0 itself. This is often undesirable
258however because the accept \s-1BIO\s0 will still accept additional incoming
259connections. This can be resolved by using \fIBIO_pop()\fR (see above)
260and freeing up the accept \s-1BIO\s0 after the initial connection.
261.PP
262If the underlying accept socket is non-blocking and \fIBIO_do_accept()\fR is
263called to await an incoming connection it is possible for
264\&\fIBIO_should_io_special()\fR with the reason \s-1BIO_RR_ACCEPT\s0. If this happens
265then it is an indication that an accept attempt would block: the application
266should take appropriate action to wait until the underlying socket has
267accepted a connection and retry the call.
268.PP
269\&\fIBIO_set_accept_port()\fR, \fIBIO_get_accept_port()\fR, \fIBIO_set_nbio_accept()\fR,
270\&\fIBIO_set_accept_bios()\fR, \fIBIO_set_bind_mode()\fR, \fIBIO_get_bind_mode()\fR and
271\&\fIBIO_do_accept()\fR are macros.
272.SH "RETURN VALUES"
273.IX Header "RETURN VALUES"
274\&\s-1TBA\s0
275.SH "EXAMPLE"
276.IX Header "EXAMPLE"
277This example accepts two connections on port 4444, sends messages
278down each and finally closes both down.
279.PP
280.Vb 3
281\& BIO *abio, *cbio, *cbio2;
282\& ERR_load_crypto_strings();
283\& abio = BIO_new_accept("4444");
|
299.Ve
300.PP
301.Vb 6
| 284\&
|
302\& /* First call to BIO_accept() sets up accept BIO */
303\& if(BIO_do_accept(abio) <= 0) {
304\& fprintf(stderr, "Error setting up accept\en");
305\& ERR_print_errors_fp(stderr);
306\& exit(0);
307\& }
| 285\& /* First call to BIO_accept() sets up accept BIO */
286\& if(BIO_do_accept(abio) <= 0) {
287\& fprintf(stderr, "Error setting up accept\en");
288\& ERR_print_errors_fp(stderr);
289\& exit(0);
290\& }
|
308.Ve
309.PP
310.Vb 23
| 291\&
|
311\& /* Wait for incoming connection */
312\& if(BIO_do_accept(abio) <= 0) {
313\& fprintf(stderr, "Error accepting connection\en");
314\& ERR_print_errors_fp(stderr);
315\& exit(0);
316\& }
317\& fprintf(stderr, "Connection 1 established\en");
318\& /* Retrieve BIO for connection */
319\& cbio = BIO_pop(abio);
320\& BIO_puts(cbio, "Connection 1: Sending out Data on initial connection\en");
321\& fprintf(stderr, "Sent out data on connection 1\en");
322\& /* Wait for another connection */
323\& if(BIO_do_accept(abio) <= 0) {
324\& fprintf(stderr, "Error accepting connection\en");
325\& ERR_print_errors_fp(stderr);
326\& exit(0);
327\& }
328\& fprintf(stderr, "Connection 2 established\en");
329\& /* Close accept BIO to refuse further connections */
330\& cbio2 = BIO_pop(abio);
331\& BIO_free(abio);
332\& BIO_puts(cbio2, "Connection 2: Sending out Data on second\en");
333\& fprintf(stderr, "Sent out data on connection 2\en");
| 292\& /* Wait for incoming connection */
293\& if(BIO_do_accept(abio) <= 0) {
294\& fprintf(stderr, "Error accepting connection\en");
295\& ERR_print_errors_fp(stderr);
296\& exit(0);
297\& }
298\& fprintf(stderr, "Connection 1 established\en");
299\& /* Retrieve BIO for connection */
300\& cbio = BIO_pop(abio);
301\& BIO_puts(cbio, "Connection 1: Sending out Data on initial connection\en");
302\& fprintf(stderr, "Sent out data on connection 1\en");
303\& /* Wait for another connection */
304\& if(BIO_do_accept(abio) <= 0) {
305\& fprintf(stderr, "Error accepting connection\en");
306\& ERR_print_errors_fp(stderr);
307\& exit(0);
308\& }
309\& fprintf(stderr, "Connection 2 established\en");
310\& /* Close accept BIO to refuse further connections */
311\& cbio2 = BIO_pop(abio);
312\& BIO_free(abio);
313\& BIO_puts(cbio2, "Connection 2: Sending out Data on second\en");
314\& fprintf(stderr, "Sent out data on connection 2\en");
|
334.Ve
335.PP
336.Vb 4
| 315\&
|
337\& BIO_puts(cbio, "Connection 1: Second connection established\en");
338\& /* Close the two established connections */
339\& BIO_free(cbio);
340\& BIO_free(cbio2);
341.Ve
342.SH "SEE ALSO"
343.IX Header "SEE ALSO"
344\&\s-1TBA\s0
| 316\& BIO_puts(cbio, "Connection 1: Second connection established\en");
317\& /* Close the two established connections */
318\& BIO_free(cbio);
319\& BIO_free(cbio2);
320.Ve
321.SH "SEE ALSO"
322.IX Header "SEE ALSO"
323\&\s-1TBA\s0
|