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112 lines
2.3 KiB
Plaintext
112 lines
2.3 KiB
Plaintext
=pod
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=head1 NAME
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SSL_client_version, SSL_get_version, SSL_is_dtls, SSL_version - get the
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protocol information of a connection
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=head1 SYNOPSIS
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#include <openssl/ssl.h>
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int SSL_client_version(const SSL *s);
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const char *SSL_get_version(const SSL *ssl);
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int SSL_is_dtls(const SSL *ssl);
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int SSL_version(const SSL *s);
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=head1 DESCRIPTION
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SSL_client_version() returns the numeric protocol version advertised by the
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client in the legacy_version field of the ClientHello when initiating the
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connection. Note that, for TLS, this value will never indicate a version greater
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than TLSv1.2 even if TLSv1.3 is subsequently negotiated. SSL_get_version()
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returns the name of the protocol used for the connection. SSL_version() returns
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the numeric protocol version used for the connection. They should only be called
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after the initial handshake has been completed. Prior to that the results
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returned from these functions may be unreliable.
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SSL_is_dtls() returns one if the connection is using DTLS, zero if not.
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=head1 RETURN VALUES
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SSL_get_version() returns one of the following strings:
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=over 4
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=item SSLv3
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The connection uses the SSLv3 protocol.
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=item TLSv1
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The connection uses the TLSv1.0 protocol.
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=item TLSv1.1
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The connection uses the TLSv1.1 protocol.
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=item TLSv1.2
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The connection uses the TLSv1.2 protocol.
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=item TLSv1.3
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The connection uses the TLSv1.3 protocol.
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=item unknown
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This indicates an unknown protocol version.
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=back
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SSL_version() and SSL_client_version() return an integer which could include any
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of the following:
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=over 4
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=item SSL3_VERSION
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The connection uses the SSLv3 protocol.
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=item TLS1_VERSION
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The connection uses the TLSv1.0 protocol.
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=item TLS1_1_VERSION
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The connection uses the TLSv1.1 protocol.
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=item TLS1_2_VERSION
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The connection uses the TLSv1.2 protocol.
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=item TLS1_3_VERSION
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The connection uses the TLSv1.3 protocol (never returned for
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SSL_client_version()).
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=back
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=head1 SEE ALSO
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L<ssl(7)>
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=head1 HISTORY
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The SSL_is_dtls() function was added in OpenSSL 1.1.0.
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=head1 COPYRIGHT
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Copyright 2001-2018 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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