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127 lines
4.1 KiB
Plaintext
127 lines
4.1 KiB
Plaintext
=pod
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=head1 NAME
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BIO_socket, BIO_bind, BIO_connect, BIO_listen, BIO_accept_ex, BIO_closesocket - BIO
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socket communication setup routines
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=head1 SYNOPSIS
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#include <openssl/bio.h>
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int BIO_socket(int domain, int socktype, int protocol, int options);
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int BIO_bind(int sock, const BIO_ADDR *addr, int options);
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int BIO_connect(int sock, const BIO_ADDR *addr, int options);
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int BIO_listen(int sock, const BIO_ADDR *addr, int options);
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int BIO_accept_ex(int accept_sock, BIO_ADDR *peer, int options);
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int BIO_closesocket(int sock);
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=head1 DESCRIPTION
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BIO_socket() creates a socket in the domain B<domain>, of type
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B<socktype> and B<protocol>. Socket B<options> are currently unused,
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but is present for future use.
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BIO_bind() binds the source address and service to a socket and
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may be useful before calling BIO_connect(). The options may include
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B<BIO_SOCK_REUSEADDR>, which is described in L</FLAGS> below.
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BIO_connect() connects B<sock> to the address and service given by
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B<addr>. Connection B<options> may be zero or any combination of
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B<BIO_SOCK_KEEPALIVE>, B<BIO_SOCK_NONBLOCK> and B<BIO_SOCK_NODELAY>.
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The flags are described in L</FLAGS> below.
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BIO_listen() has B<sock> start listening on the address and service
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given by B<addr>. Connection B<options> may be zero or any
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combination of B<BIO_SOCK_KEEPALIVE>, B<BIO_SOCK_NONBLOCK>,
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B<BIO_SOCK_NODELAY>, B<BIO_SOCK_REUSEADDR> and B<BIO_SOCK_V6_ONLY>.
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The flags are described in L</FLAGS> below.
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BIO_accept_ex() waits for an incoming connections on the given
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socket B<accept_sock>. When it gets a connection, the address and
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port of the peer gets stored in B<peer> if that one is non-NULL.
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Accept B<options> may be zero or B<BIO_SOCK_NONBLOCK>, and is applied
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on the accepted socket. The flags are described in L</FLAGS> below.
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BIO_closesocket() closes B<sock>.
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=head1 FLAGS
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=over 4
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=item BIO_SOCK_KEEPALIVE
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Enables regular sending of keep-alive messages.
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=item BIO_SOCK_NONBLOCK
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Sets the socket to nonblocking mode.
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=item BIO_SOCK_NODELAY
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Corresponds to B<TCP_NODELAY>, and disables the Nagle algorithm. With
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this set, any data will be sent as soon as possible instead of being
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buffered until there's enough for the socket to send out in one go.
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=item BIO_SOCK_REUSEADDR
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Try to reuse the address and port combination for a recently closed
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port.
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=item BIO_SOCK_V6_ONLY
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When creating an IPv6 socket, make it only listen for IPv6 addresses
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and not IPv4 addresses mapped to IPv6.
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=item BIO_SOCK_TFO
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Enables TCP Fast Open on the socket. Uses appropriate APIs on
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supported operating systems, including Linux, macOS and FreeBSD. Can
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be used with BIO_connect(), BIO_set_conn_mode(), BIO_set_bind_mode(),
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and BIO_listen().
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On Linux kernels before 4.14, use BIO_set_conn_address() to specify
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the peer address before starting the TLS handshake.
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=back
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These flags are bit flags, so they are to be combined with the
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C<|> operator, for example:
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BIO_connect(sock, addr, BIO_SOCK_KEEPALIVE | BIO_SOCK_NONBLOCK);
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=head1 RETURN VALUES
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BIO_socket() returns the socket number on success or B<INVALID_SOCKET>
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(-1) on error. When an error has occurred, the OpenSSL error stack
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will hold the error data and errno has the system error.
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BIO_bind(), BIO_connect() and BIO_listen() return 1 on success or 0 on error.
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When an error has occurred, the OpenSSL error stack will hold the error
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data and errno has the system error.
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BIO_accept_ex() returns the accepted socket on success or
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B<INVALID_SOCKET> (-1) on error. When an error has occurred, the
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OpenSSL error stack will hold the error data and errno has the system
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error.
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=head1 SEE ALSO
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L<BIO_ADDR(3)>
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=head1 HISTORY
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BIO_gethostname(), BIO_get_port(), BIO_get_host_ip(),
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BIO_get_accept_socket() and BIO_accept() were deprecated in OpenSSL 1.1.0.
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Use the functions described above instead.
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=head1 COPYRIGHT
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Copyright 2016-2022 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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