BIO_socket, BIO_bind, BIO_connect, BIO_listen, BIO_accept_ex, BIO_closesocket -
BIO socket communication setup routines
#include <openssl/bio.h>
int BIO_socket(int domain, int socktype, int protocol, int options);
int BIO_bind(int sock, const BIO_ADDR *addr, int options);
int BIO_connect(int sock, const BIO_ADDR *addr, int options);
int BIO_listen(int sock, const BIO_ADDR *addr, int options);
int BIO_accept_ex(int accept_sock, BIO_ADDR *peer, int options);
int BIO_closesocket(int sock);
BIO_socket() creates a socket in the domain
domain, of type
socktype and
protocol. Socket
options are currently
unused, but is present for future use.
BIO_bind() binds the source address and service to a socket and may be
useful before calling
BIO_connect(). The options may include
BIO_SOCK_REUSEADDR, which is described in "FLAGS" below.
BIO_connect() connects
sock to the address and service given by
addr. Connection
options may be zero or any combination of
BIO_SOCK_KEEPALIVE,
BIO_SOCK_NONBLOCK and
BIO_SOCK_NODELAY. The flags are described in "FLAGS" below.
BIO_listen() has
sock start listening on the address and service
given by
addr. Connection
options may be zero or any combination
of
BIO_SOCK_KEEPALIVE,
BIO_SOCK_NONBLOCK,
BIO_SOCK_NODELAY,
BIO_SOCK_REUSEADDR and
BIO_SOCK_V6_ONLY. The flags are described in "FLAGS" below.
BIO_accept_ex() waits for an incoming connections on the given socket
accept_sock. When it gets a connection, the address and port of the
peer gets stored in
peer if that one is non-NULL. Accept
options
may be zero or
BIO_SOCK_NONBLOCK, and is applied on the accepted
socket. The flags are described in "FLAGS" below.
BIO_closesocket() closes
sock.
- BIO_SOCK_KEEPALIVE
- Enables regular sending of keep-alive messages.
- BIO_SOCK_NONBLOCK
- Sets the socket to nonblocking mode.
- BIO_SOCK_NODELAY
- Corresponds to TCP_NODELAY, and disables the Nagle
algorithm. With this set, any data will be sent as soon as possible
instead of being buffered until there's enough for the socket to send out
in one go.
- BIO_SOCK_REUSEADDR
- Try to reuse the address and port combination for a
recently closed port.
- BIO_SOCK_V6_ONLY
- When creating an IPv6 socket, make it only listen for IPv6
addresses and not IPv4 addresses mapped to IPv6.
These flags are bit flags, so they are to be combined with the "|"
operator, for example:
BIO_connect(sock, addr, BIO_SOCK_KEEPALIVE | BIO_SOCK_NONBLOCK);
BIO_socket() returns the socket number on success or
INVALID_SOCKET (-1) on error. When an error has occurred, the OpenSSL
error stack will hold the error data and errno has the system error.
BIO_bind(),
BIO_connect() and
BIO_listen() return 1 on
success or 0 on error. When an error has occurred, the OpenSSL error stack
will hold the error data and errno has the system error.
BIO_accept_ex() returns the accepted socket on success or
INVALID_SOCKET (-1) on error. When an error has occurred, the OpenSSL
error stack will hold the error data and errno has the system error.
BIO_ADDR(3)
BIO_gethostname(),
BIO_get_port(),
BIO_get_host_ip(),
BIO_get_accept_socket() and
BIO_accept() were deprecated in
OpenSSL 1.1.0. Use the functions described above instead.
Copyright 2016-2020 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the Apache License 2.0 (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
<
https://www.openssl.org/source/license.html>.