1SSL_ACCEPT(3)                       OpenSSL                      SSL_ACCEPT(3)
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NAME

6       SSL_accept - wait for a TLS/SSL client to initiate a TLS/SSL handshake
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SYNOPSIS

9        #include <openssl/ssl.h>
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11        int SSL_accept(SSL *ssl);
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DESCRIPTION

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

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

37       The following return values can occur:
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39       0   The TLS/SSL handshake was not successful but was shut down
40           controlled and by the specifications of the TLS/SSL protocol. Call
41           SSL_get_error() with the return value ret to find out the reason.
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43       1   The TLS/SSL handshake was successfully completed, a TLS/SSL
44           connection has been established.
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46       <0  The TLS/SSL handshake was not successful because a fatal error
47           occurred either at the protocol level or a connection failure
48           occurred. The shutdown was not clean. It can also occur if action
49           is needed to continue the operation for nonblocking BIOs. Call
50           SSL_get_error() with the return value ret to find out the reason.
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SEE ALSO

53       SSL_get_error(3), SSL_connect(3), SSL_shutdown(3), ssl(7), bio(7),
54       SSL_set_connect_state(3), SSL_do_handshake(3), SSL_CTX_new(3)
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57       Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved.
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59       Licensed under the OpenSSL license (the "License").  You may not use
60       this file except in compliance with the License.  You can obtain a copy
61       in the file LICENSE in the source distribution or at
62       <https://www.openssl.org/source/license.html>.
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661.1.1i                            2021-01-26                     SSL_ACCEPT(3)
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