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Title "SSL_SET_FD 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
SSL_set_fd, SSL_set_rfd, SSL_set_wfd - connect the SSL object with a file descriptor Header "SYNOPSIS" .Vb 1 #include <openssl/ssl.h> \& int SSL_set_fd(SSL *ssl, int fd); int SSL_set_rfd(SSL *ssl, int fd); int SSL_set_wfd(SSL *ssl, int fd); .Ve Header "DESCRIPTION" \fBSSL_set_fd() sets the file descriptor fd as the input/output facility for the \s-1TLS/SSL\s0 (encrypted) side of ssl. fd will typically be the socket file descriptor of a network connection.

When performing the operation, a socket \s-1BIO\s0 is automatically created to interface between the ssl and fd. The \s-1BIO\s0 and hence the \s-1SSL\s0 engine inherit the behaviour of fd. If fd is nonblocking, the ssl will also have nonblocking behaviour.

If there was already a \s-1BIO\s0 connected to ssl, BIO_free() will be called (for both the reading and writing side, if different).

\fBSSL_set_rfd() and SSL_set_wfd() perform the respective action, but only for the read channel or the write channel, which can be set independently.

Header "RETURN VALUES" The following return values can occur: The operation failed. Check the error stack to find out why. Item "1" The operation succeeded. Header "NOTES" On Windows, a socket handle is a 64-bit data type (\s-1UINT_PTR\s0), which leads to a compiler warning (conversion from '\s-1SOCKET\s0' to 'int', possible loss of data) when passing the socket handle to SSL_set_*fd(). For the time being, this warning can safely be ignored, because although the Microsoft documentation claims that the upper limit is \s-1INVALID_SOCKET-1\s0 (2^64 - 2), in practice the current socket() implementation returns an index into the kernel handle table, the size of which is limited to 2^24. Header "SEE ALSO" \fBSSL_get_fd\|(3), SSL_set_bio\|(3), \fBSSL_connect\|(3), SSL_accept\|(3), \fBSSL_shutdown\|(3), ssl\|(7) , bio\|(7) Header "COPYRIGHT" Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the \*(L"License\*(R"). 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 <https://www.openssl.org/source/license.html>.