1BIO_CONNECT(3) OpenSSL BIO_CONNECT(3)
2
6 BIO_socket, BIO_bind, BIO_connect, BIO_listen, BIO_accept_ex,
7 BIO_closesocket - BIO socket communication setup routines
8
10 #include <openssl/bio.h>
11 int BIO_socket(int domain, int socktype, int protocol, int options);
13 int BIO_bind(int sock, const BIO_ADDR *addr, int options);
14 int BIO_connect(int sock, const BIO_ADDR *addr, int options);
15 int BIO_listen(int sock, const BIO_ADDR *addr, int options);
16 int BIO_accept_ex(int accept_sock, BIO_ADDR *peer, int options);
17 int BIO_closesocket(int sock);
18
20 BIO_socket() creates a socket in the domain domain, of type socktype
21 and protocol. Socket options are currently unused, but is present for
22 future use.
23 BIO_bind() binds the source address and service to a socket and may be
25 useful before calling BIO_connect(). The options may include
26 BIO_SOCK_REUSEADDR, which is described in "FLAGS" below.
27 BIO_connect() connects sock to the address and service given by addr.
29 Connection options may be zero or any combination of
30 BIO_SOCK_KEEPALIVE, BIO_SOCK_NONBLOCK and BIO_SOCK_NODELAY. The flags
31 are described in "FLAGS" below.
32 BIO_listen() has sock start listening on the address and service given
34 by addr. Connection options may be zero or any combination of
35 BIO_SOCK_KEEPALIVE, BIO_SOCK_NONBLOCK, BIO_SOCK_NODELAY,
36 BIO_SOCK_REUSEADDR and BIO_SOCK_V6_ONLY. The flags are described in
37 "FLAGS" below.
38 BIO_accept_ex() waits for an incoming connections on the given socket
40 accept_sock. When it gets a connection, the address and port of the
41 peer gets stored in peer if that one is non-NULL. Accept options may
42 be zero or BIO_SOCK_NONBLOCK, and is applied on the accepted socket.
43 The flags are described in "FLAGS" below.
44 BIO_closesocket() closes sock.
46
48 BIO_SOCK_KEEPALIVE
49 Enables regular sending of keep-alive messages.
50 BIO_SOCK_NONBLOCK
52 Sets the socket to nonblocking mode.
53 BIO_SOCK_NODELAY
55 Corresponds to TCP_NODELAY, and disables the Nagle algorithm. With
56 this set, any data will be sent as soon as possible instead of
57 being buffered until there's enough for the socket to send out in
58 one go.
59 BIO_SOCK_REUSEADDR
61 Try to reuse the address and port combination for a recently closed
62 port.
63 BIO_SOCK_V6_ONLY
65 When creating an IPv6 socket, make it only listen for IPv6
66 addresses and not IPv4 addresses mapped to IPv6.
67 These flags are bit flags, so they are to be combined with the "|"
69 operator, for example:
70 BIO_connect(sock, addr, BIO_SOCK_KEEPALIVE | BIO_SOCK_NONBLOCK);
72
74 BIO_socket() returns the socket number on success or INVALID_SOCKET
75 (-1) on error. When an error has occurred, the OpenSSL error stack
76 will hold the error data and errno has the system error.
77 BIO_bind(), BIO_connect() and BIO_listen() return 1 on success or 0 on
79 error. When an error has occurred, the OpenSSL error stack will hold
80 the error data and errno has the system error.
81 BIO_accept_ex() returns the accepted socket on success or
83 INVALID_SOCKET (-1) on error. When an error has occurred, the OpenSSL
84 error stack will hold the error data and errno has the system error.
85
87 BIO_ADDR(3)
88
90 BIO_gethostname(), BIO_get_port(), BIO_get_host_ip(),
91 BIO_get_accept_socket() and BIO_accept() were deprecated in OpenSSL
92 1.1.0. Use the functions described above instead.
93
95 Copyright 2016-2020 The OpenSSL Project Authors. All Rights Reserved.
96 Licensed under the OpenSSL license (the "License"). You may not use
98 this file except in compliance with the License. You can obtain a copy
99 in the file LICENSE in the source distribution or at
100 <https://www.openssl.org/source/license.html>.
1011.1.1q 2023-07-20 BIO_CONNECT(3)