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SSL_SET_FD(3) Library Functions Manual SSL_SET_FD(3)

SSL_set_fd, SSL_set_rfd, SSL_set_wfdconnect the SSL object with a file descriptor

#include <openssl/ssl.h>

SSL_set_fd(SSL *ssl, int fd);

SSL_set_rfd(SSL *ssl, int fd);

SSL_set_wfd(SSL *ssl, int fd);

() sets the file descriptor fd as the input/output facility for the TLS/SSL (encrypted) side of ssl. fd will typically be the socket file descriptor of a network connection.

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

If there was already a BIO connected to ssl, BIO_free(3) will be called (for both the reading and writing side, if different).

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

The following return values can occur:

The operation failed. Check the error stack to find out why.
The operation succeeded.

BIO_new(3), ssl(3), SSL_accept(3), SSL_connect(3), SSL_get_fd(3), SSL_set_bio(3), SSL_shutdown(3)

SSL_set_fd() appeared in SSLeay 0.4 or earlier. SSL_set_rfd() and SSL_set_wfd() first appeared in SSLeay 0.6.0. These functions have been available since OpenBSD 2.4.

March 27, 2018 OpenBSD-7.3