SSL_ACCEPT - Online Linux Manual PageSection : 3
Updated : 2021-03-26
Source : 1.1.1k
Note : OpenSSL

NAMESSL_accept − wait for a TLS/SSL client to initiate a TLS/SSL handshake

SYNOPSIS​ #include <openssl/ssl.h> ​ ​ int SSL_accept(SSL *ssl);

DESCRIPTIONSSL_accept() waits for a TLS/SSL client to initiate the TLS/SSL handshake. The communication channel must already have been set and assigned to the ​ssl by setting an underlying BIO.

NOTESThe behaviour of SSL_accept() depends on the underlying BIO. If the underlying BIO is blocking, SSL_accept() will only return once the handshake has been finished or an error occurred. If the underlying BIO is nonblocking, SSL_accept() will also return when the underlying BIO could not satisfy the needs of SSL_accept() to continue the handshake, indicating the problem by the return value −1. In this case a call to SSL_get_error() with the return value of SSL_accept() will yield SSL_ERROR_WANT_READ or ​SSL_ERROR_WANT_WRITE. The calling process then must repeat the call after taking appropriate action to satisfy the needs of SSL_accept(). The action depends on the underlying BIO. When using a nonblocking socket, nothing is to be done, but select() can be used to check for the required condition. When using a buffering BIO, like a BIO pair, data must be written into or retrieved out of the BIO before being able to continue.

RETURN VALUESThe following return values can occur: The TLS/SSL handshake was not successful but was shut down controlled and by the specifications of the TLS/SSL protocol. Call SSL_get_error() with the return value ret to find out the reason. The TLS/SSL handshake was successfully completed, a TLS/SSL connection has been established. <The TLS/SSL handshake was not successful because a fatal error occurred either at the protocol level or a connection failure occurred. The shutdown was not clean. It can also occur if action is needed to continue the operation for nonblocking BIOs. Call SSL_get_error() with the return value ret to find out the reason.

SEE ALSOSSL_get_error(3), SSL_connect(3), ​SSL_shutdown(3), ssl(7), bio(7), ​SSL_set_connect_state(3), ​SSL_do_handshake(3), ​SSL_CTX_new(3)

COPYRIGHTCopyright 2000−2020 The OpenSSL Project Authors. All Rights Reserved. Licensed under the OpenSSL license (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>.
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