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# Conflicts:
#	README.md
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Zhi Guan
2017-02-14 16:12:29 +08:00
parent d2254170b8
commit 43fed1108d
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117
doc/crypto/BIO_s_accept.pod
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@@ -2,17 +2,20 @@
=head1 NAME
BIO_s_accept, BIO_set_accept_port, BIO_get_accept_port, BIO_new_accept,
BIO_set_nbio_accept, BIO_set_accept_bios, BIO_set_bind_mode,
BIO_get_bind_mode, BIO_do_accept - accept BIO
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_set_bind_mode, BIO_get_bind_mode, BIO_do_accept - accept BIO
=head1 SYNOPSIS
#include <openssl/bio.h>
BIO_METHOD *BIO_s_accept(void);
const BIO_METHOD *BIO_s_accept(void);
long BIO_set_accept_port(BIO *b, char *name);
long BIO_set_accept_name(BIO *b, char *name);
char *BIO_get_accept_name(BIO *b);
long BIO_set_accept_port(BIO *b, char *port);
char *BIO_get_accept_port(BIO *b);
BIO *BIO_new_accept(char *host_port);
@@ -21,11 +24,7 @@ BIO_get_bind_mode, BIO_do_accept - accept BIO
long BIO_set_accept_bios(BIO *b, char *bio);
long BIO_set_bind_mode(BIO *b, long mode);
long BIO_get_bind_mode(BIO *b, long dummy);
#define BIO_BIND_NORMAL 0
#define BIO_BIND_REUSEADDR_IF_UNUSED 1
#define BIO_BIND_REUSEADDR 2
long BIO_get_bind_mode(BIO *b);
int BIO_do_accept(BIO *b);
@@ -49,23 +48,30 @@ If the close flag is set on an accept BIO then any active
connection on that chain is shutdown and the socket closed when
the BIO is freed.
Calling BIO_reset() on a accept BIO will close any active
Calling BIO_reset() on an accept BIO will close any active
connection and reset the BIO into a state where it awaits another
incoming connection.
BIO_get_fd() and BIO_set_fd() can be called to retrieve or set
the accept socket. See L<BIO_s_fd(3)|BIO_s_fd(3)>
the accept socket. See L<BIO_s_fd(3)>
BIO_set_accept_port() uses the string B<name> to set the accept
port. The port is represented as a string of the form "host:port",
BIO_set_accept_name() uses the string B<name> to set the accept
name. The name is represented as a string of the form "host:port",
where "host" is the interface to use and "port" is the port.
The host can be can be "*" which is interpreted as meaning
any interface; "port" has the same syntax
as the port specified in BIO_set_conn_port() for connect BIOs,
that is it can be a numerical port string or a string to lookup
using getservbyname() and a string table.
The host can be "*" 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 "[::1]:https". "port" has the
same syntax as the port specified in BIO_set_conn_port() for
connect BIOs, that is it can be a numerical port string or a
string to lookup using getservbyname() and a string table.
BIO_new_accept() combines BIO_new() and BIO_set_accept_port() into
BIO_set_accept_port() uses the string B<port> to set the accept
port. "port" has the same syntax as the port specified in
BIO_set_conn_port() for connect BIOs, that is it can be a numerical
port string or a string to lookup using getservbyname() and a string
table.
BIO_new_accept() combines BIO_new() and BIO_set_accept_name() into
a single call: that is it creates a new accept BIO with port
B<host_port>.
@@ -74,19 +80,19 @@ BIO_set_nbio_accept() sets the accept socket to blocking mode
BIO_set_accept_bios() 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
connection is received. This is useful if, for example, a
buffering or SSL BIO is required for each connection. The
chain of BIOs must not be freed after this call, they will
be automatically freed when the accept BIO is freed.
BIO_set_bind_mode() and BIO_get_bind_mode() set and retrieve
the current bind mode. If BIO_BIND_NORMAL (the default) is set
the current bind mode. If B<BIO_BIND_NORMAL> (the default) is set
then another socket cannot be bound to the same port. If
BIO_BIND_REUSEADDR is set then other sockets can bind to the
same port. If BIO_BIND_REUSEADDR_IF_UNUSED is set then and
B<BIO_BIND_REUSEADDR> is set then other sockets can bind to the
same port. If B<BIO_BIND_REUSEADDR_IF_UNUSED> is set then and
attempt is first made to use BIO_BIN_NORMAL, if this fails
and the port is not in use then a second attempt is made
using BIO_BIND_REUSEADDR.
using B<BIO_BIND_REUSEADDR>.
BIO_do_accept() serves two functions. When it is first
called, after the accept BIO has been setup, it will attempt
@@ -137,13 +143,24 @@ 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.
BIO_set_accept_port(), BIO_get_accept_port(), BIO_set_nbio_accept(),
BIO_set_accept_bios(), BIO_set_bind_mode(), BIO_get_bind_mode() and
BIO_do_accept() are macros.
BIO_set_accept_name(), BIO_get_accept_name(), BIO_set_accept_port(),
BIO_get_accept_port(), BIO_set_nbio_accept(), BIO_set_accept_bios(),
BIO_set_bind_mode(), BIO_get_bind_mode() and BIO_do_accept() are macros.
=head1 RETURN VALUES
TBA
BIO_do_accept(),
BIO_set_accept_name(), BIO_set_accept_port(), BIO_set_nbio_accept(),
BIO_set_accept_bios(), and BIO_set_bind_mode(), return 1 for success and 0 or
-1 for failure.
BIO_get_accept_name() returns the accept name or NULL on error.
BIO_get_accept_port() returns the port as a string or NULL on error.
BIO_get_bind_mode() returns the set of B<BIO_BIND> flags, or -1 on failure.
BIO_new_accept() returns a BIO or NULL on error.
=head1 EXAMPLE
@@ -151,34 +168,36 @@ This example accepts two connections on port 4444, sends messages
down each and finally closes both down.
BIO *abio, *cbio, *cbio2;
ERR_load_crypto_strings();
abio = BIO_new_accept("4444");
/* First call to BIO_accept() sets up accept BIO */
if(BIO_do_accept(abio) <= 0) {
fprintf(stderr, "Error setting up accept\n");
ERR_print_errors_fp(stderr);
exit(0);
abio = BIO_new_accept("4444");
if (BIO_do_accept(abio) <= 0) {
fprintf(stderr, "Error setting up accept\n");
ERR_print_errors_fp(stderr);
exit(1);
}
/* Wait for incoming connection */
if(BIO_do_accept(abio) <= 0) {
fprintf(stderr, "Error accepting connection\n");
ERR_print_errors_fp(stderr);
exit(0);
if (BIO_do_accept(abio) <= 0) {
fprintf(stderr, "Error accepting connection\n");
ERR_print_errors_fp(stderr);
exit(1);
}
fprintf(stderr, "Connection 1 established\n");
/* Retrieve BIO for connection */
cbio = BIO_pop(abio);
BIO_puts(cbio, "Connection 1: Sending out Data on initial connection\n");
fprintf(stderr, "Sent out data on connection 1\n");
/* Wait for another connection */
if(BIO_do_accept(abio) <= 0) {
fprintf(stderr, "Error accepting connection\n");
ERR_print_errors_fp(stderr);
exit(0);
if (BIO_do_accept(abio) <= 0) {
fprintf(stderr, "Error accepting connection\n");
ERR_print_errors_fp(stderr);
exit(1);
}
fprintf(stderr, "Connection 2 established\n");
/* Close accept BIO to refuse further connections */
cbio2 = BIO_pop(abio);
BIO_free(abio);
@@ -186,10 +205,18 @@ down each and finally closes both down.
fprintf(stderr, "Sent out data on connection 2\n");
BIO_puts(cbio, "Connection 1: Second connection established\n");
/* Close the two established connections */
BIO_free(cbio);
BIO_free(cbio2);
=head1 SEE ALSO
=head1 COPYRIGHT
TBA
Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the OpenSSL license (the "License"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file LICENSE in the source distribution or at
L<https://www.openssl.org/source/license.html>.
=cut