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.IX Title &quot;BIO_S_ACCEPT 3&quot;
.TH BIO_S_ACCEPT 3 &quot;2023-09-11&quot; &quot;1.1.1w&quot; &quot;OpenSSL&quot;
.\&quot; For nroff, turn off justification.  Always turn off hyphenation; it makes
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.nh
.SH &quot;NAME&quot;
BIO_s_accept, BIO_set_accept_name, BIO_set_accept_port, BIO_get_accept_name, BIO_get_accept_port, BIO_new_accept, BIO_set_nbio_accept, BIO_set_accept_bios, BIO_get_peer_name, BIO_get_peer_port, BIO_get_accept_ip_family, BIO_set_accept_ip_family, BIO_set_bind_mode, BIO_get_bind_mode, BIO_do_accept \- accept BIO
.SH &quot;SYNOPSIS&quot;
.IX Header &quot;SYNOPSIS&quot;
.Vb 1
\&amp; #include &lt;openssl/bio.h&gt;
\&amp;
\&amp; const BIO_METHOD *BIO_s_accept(void);
\&amp;
\&amp; long BIO_set_accept_name(BIO *b, char *name);
\&amp; char *BIO_get_accept_name(BIO *b);
\&amp;
\&amp; long BIO_set_accept_port(BIO *b, char *port);
\&amp; char *BIO_get_accept_port(BIO *b);
\&amp;
\&amp; BIO *BIO_new_accept(char *host_port);
\&amp;
\&amp; long BIO_set_nbio_accept(BIO *b, int n);
\&amp; long BIO_set_accept_bios(BIO *b, char *bio);
\&amp;
\&amp; char *BIO_get_peer_name(BIO *b);
\&amp; char *BIO_get_peer_port(BIO *b);
\&amp; long BIO_get_accept_ip_family(BIO *b);
\&amp; long BIO_set_accept_ip_family(BIO *b, long family);
\&amp;
\&amp; long BIO_set_bind_mode(BIO *b, long mode);
\&amp; long BIO_get_bind_mode(BIO *b);
\&amp;
\&amp; int BIO_do_accept(BIO *b);
.Ve
.SH &quot;DESCRIPTION&quot;
.IX Header &quot;DESCRIPTION&quot;
\&amp;\fIBIO_s_accept()\fR returns the accept \s-1BIO\s0 method. This is a wrapper
round the platform's \s-1TCP/IP\s0 socket accept routines.
.PP
Using accept BIOs, \s-1TCP/IP\s0 connections can be accepted and data
transferred using only \s-1BIO\s0 routines. In this way any platform
specific operations are hidden by the \s-1BIO\s0 abstraction.
.PP
Read and write operations on an accept \s-1BIO\s0 will perform I/O
on the underlying connection. If no connection is established
and the port (see below) is set up properly then the \s-1BIO\s0
waits for an incoming connection.
.PP
Accept BIOs support \fIBIO_puts()\fR but not \fIBIO_gets()\fR.
.PP
If the close flag is set on an accept \s-1BIO\s0 then any active
connection on that chain is shutdown and the socket closed when
the \s-1BIO\s0 is freed.
.PP
Calling \fIBIO_reset()\fR on an accept \s-1BIO\s0 will close any active
connection and reset the \s-1BIO\s0 into a state where it awaits another
incoming connection.
.PP
\&amp;\fIBIO_get_fd()\fR and \fIBIO_set_fd()\fR can be called to retrieve or set
the accept socket. See \fIBIO_s_fd\fR\|(3)
.PP
\&amp;\fIBIO_set_accept_name()\fR uses the string \fBname\fR to set the accept
name. The name is represented as a string of the form \*(L&quot;host:port\*(R&quot;,
where \*(L&quot;host\*(R&quot; is the interface to use and \*(L&quot;port\*(R&quot; is the port.
The host can be \*(L&quot;*\*(R&quot; or empty which is interpreted as meaning
any interface.  If the host is an IPv6 address, it has to be
enclosed in brackets, for example \*(L&quot;[::1]:https\*(R&quot;.  \*(L&quot;port\*(R&quot; has the
same syntax as the port specified in \fIBIO_set_conn_port()\fR for
connect BIOs, that is it can be a numerical port string or a
string to lookup using \fIgetservbyname()\fR and a string table.
.PP
\&amp;\fIBIO_set_accept_port()\fR uses the string \fBport\fR to set the accept
port.  \*(L&quot;port\*(R&quot; has the same syntax as the port specified in
\&amp;\fIBIO_set_conn_port()\fR for connect BIOs, that is it can be a numerical
port string or a string to lookup using \fIgetservbyname()\fR and a string
table.
.PP
\&amp;\fIBIO_new_accept()\fR combines \fIBIO_new()\fR and \fIBIO_set_accept_name()\fR into
a single call: that is it creates a new accept \s-1BIO\s0 with port
\&amp;\fBhost_port\fR.
.PP
\&amp;\fIBIO_set_nbio_accept()\fR sets the accept socket to blocking mode
(the default) if \fBn\fR is 0 or non blocking mode if \fBn\fR is 1.
.PP
\&amp;\fIBIO_set_accept_bios()\fR can be used to set a chain of BIOs which
will be duplicated and prepended to the chain when an incoming
connection is received. This is useful if, for example, a
buffering or \s-1SSL BIO\s0 is required for each connection. The
chain of BIOs must not be freed after this call, they will
be automatically freed when the accept \s-1BIO\s0 is freed.
.PP
\&amp;\fIBIO_set_bind_mode()\fR and \fIBIO_get_bind_mode()\fR set and retrieve
the current bind mode. If \fB\s-1BIO_BIND_NORMAL\s0\fR (the default) is set
then another socket cannot be bound to the same port. If
\&amp;\fB\s-1BIO_BIND_REUSEADDR\s0\fR is set then other sockets can bind to the
same port. If \fB\s-1BIO_BIND_REUSEADDR_IF_UNUSED\s0\fR is set then and
attempt is first made to use \s-1BIO_BIN_NORMAL,\s0 if this fails
and the port is not in use then a second attempt is made
using \fB\s-1BIO_BIND_REUSEADDR\s0\fR.
.PP
\&amp;\fIBIO_do_accept()\fR serves two functions. When it is first
called, after the accept \s-1BIO\s0 has been setup, it will attempt
to create the accept socket and bind an address to it. Second
and subsequent calls to \fIBIO_do_accept()\fR will await an incoming
connection, or request a retry in non blocking mode.
.SH &quot;NOTES&quot;
.IX Header &quot;NOTES&quot;
When an accept \s-1BIO\s0 is at the end of a chain it will await an
incoming connection before processing I/O calls. When an accept
\&amp;\s-1BIO\s0 is not at then end of a chain it passes I/O calls to the next
\&amp;\s-1BIO\s0 in the chain.
.PP
When a connection is established a new socket \s-1BIO\s0 is created for
the connection and appended to the chain. That is the chain is now
accept\-&gt;socket. This effectively means that attempting I/O on
an initial accept socket will await an incoming connection then
perform I/O on it.
.PP
If any additional BIOs have been set using \fIBIO_set_accept_bios()\fR
then they are placed between the socket and the accept \s-1BIO,\s0
that is the chain will be accept\-&gt;otherbios\-&gt;socket.
.PP
If a server wishes to process multiple connections (as is normally
the case) then the accept \s-1BIO\s0 must be made available for further
incoming connections. This can be done by waiting for a connection and
then calling:
.PP
.Vb 1
\&amp; connection = BIO_pop(accept);
.Ve
.PP
After this call \fBconnection\fR will contain a \s-1BIO\s0 for the recently
established connection and \fBaccept\fR will now be a single \s-1BIO\s0
again which can be used to await further incoming connections.
If no further connections will be accepted the \fBaccept\fR can
be freed using \fIBIO_free()\fR.
.PP
If only a single connection will be processed it is possible to
perform I/O using the accept \s-1BIO\s0 itself. This is often undesirable
however because the accept \s-1BIO\s0 will still accept additional incoming
connections. This can be resolved by using \fIBIO_pop()\fR (see above)
and freeing up the accept \s-1BIO\s0 after the initial connection.
.PP
If the underlying accept socket is nonblocking and \fIBIO_do_accept()\fR is
called to await an incoming connection it is possible for
\&amp;\fIBIO_should_io_special()\fR with the reason \s-1BIO_RR_ACCEPT.\s0 If this happens
then it is an indication that an accept attempt would block: the application
should take appropriate action to wait until the underlying socket has
accepted a connection and retry the call.
.PP
\&amp;\fIBIO_set_accept_name()\fR, \fIBIO_get_accept_name()\fR, \fIBIO_set_accept_port()\fR,
\&amp;\fIBIO_get_accept_port()\fR, \fIBIO_set_nbio_accept()\fR, \fIBIO_set_accept_bios()\fR,
\&amp;\fIBIO_get_peer_name()\fR, \fIBIO_get_peer_port()\fR,
\&amp;\fIBIO_get_accept_ip_family()\fR, \fIBIO_set_accept_ip_family()\fR,
\&amp;\fIBIO_set_bind_mode()\fR, \fIBIO_get_bind_mode()\fR and \fIBIO_do_accept()\fR are macros.
.SH &quot;RETURN VALUES&quot;
.IX Header &quot;RETURN VALUES&quot;
\&amp;\fIBIO_do_accept()\fR,
\&amp;\fIBIO_set_accept_name()\fR, \fIBIO_set_accept_port()\fR, \fIBIO_set_nbio_accept()\fR,
\&amp;\fIBIO_set_accept_bios()\fR, \fIBIO_set_accept_ip_family()\fR, and \fIBIO_set_bind_mode()\fR
return 1 for success and 0 or \-1 for failure.
.PP
\&amp;\fIBIO_get_accept_name()\fR returns the accept name or \s-1NULL\s0 on error.
\&amp;\fIBIO_get_peer_name()\fR returns the peer name or \s-1NULL\s0 on error.
.PP
\&amp;\fIBIO_get_accept_port()\fR returns the accept port as a string or \s-1NULL\s0 on error.
\&amp;\fIBIO_get_peer_port()\fR returns the peer port as a string or \s-1NULL\s0 on error.
\&amp;\fIBIO_get_accept_ip_family()\fR returns the \s-1IP\s0 family or \-1 on error.
.PP
\&amp;\fIBIO_get_bind_mode()\fR returns the set of \fB\s-1BIO_BIND\s0\fR flags, or \-1 on failure.
.PP
\&amp;\fIBIO_new_accept()\fR returns a \s-1BIO\s0 or \s-1NULL\s0 on error.
.SH &quot;EXAMPLES&quot;
.IX Header &quot;EXAMPLES&quot;
This example accepts two connections on port 4444, sends messages
down each and finally closes both down.
.PP
.Vb 1
\&amp; BIO *abio, *cbio, *cbio2;
\&amp;
\&amp; /* First call to BIO_accept() sets up accept BIO */
\&amp; abio = BIO_new_accept(&quot;4444&quot;);
\&amp; if (BIO_do_accept(abio) &lt;= 0) {
\&amp;     fprintf(stderr, &quot;Error setting up accept\en&quot;);
\&amp;     ERR_print_errors_fp(stderr);
\&amp;     exit(1);
\&amp; }
\&amp;
\&amp; /* Wait for incoming connection */
\&amp; if (BIO_do_accept(abio) &lt;= 0) {
\&amp;     fprintf(stderr, &quot;Error accepting connection\en&quot;);
\&amp;     ERR_print_errors_fp(stderr);
\&amp;     exit(1);
\&amp; }
\&amp; fprintf(stderr, &quot;Connection 1 established\en&quot;);
\&amp;
\&amp; /* Retrieve BIO for connection */
\&amp; cbio = BIO_pop(abio);
\&amp; BIO_puts(cbio, &quot;Connection 1: Sending out Data on initial connection\en&quot;);
\&amp; fprintf(stderr, &quot;Sent out data on connection 1\en&quot;);
\&amp;
\&amp; /* Wait for another connection */
\&amp; if (BIO_do_accept(abio) &lt;= 0) {
\&amp;     fprintf(stderr, &quot;Error accepting connection\en&quot;);
\&amp;     ERR_print_errors_fp(stderr);
\&amp;     exit(1);
\&amp; }
\&amp; fprintf(stderr, &quot;Connection 2 established\en&quot;);
\&amp;
\&amp; /* Close accept BIO to refuse further connections */
\&amp; cbio2 = BIO_pop(abio);
\&amp; BIO_free(abio);
\&amp; BIO_puts(cbio2, &quot;Connection 2: Sending out Data on second\en&quot;);
\&amp; fprintf(stderr, &quot;Sent out data on connection 2\en&quot;);
\&amp;
\&amp; BIO_puts(cbio, &quot;Connection 1: Second connection established\en&quot;);
\&amp;
\&amp; /* Close the two established connections */
\&amp; BIO_free(cbio);
\&amp; BIO_free(cbio2);
.Ve
.SH &quot;COPYRIGHT&quot;
.IX Header &quot;COPYRIGHT&quot;
Copyright 2000\-2020 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L&quot;License\*(R&quot;).  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
&lt;https://www.openssl.org/source/license.html&gt;.
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