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Title "SSL_GET_VERSION 3"
way too many mistakes in technical documents.
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.... Set up some character translations and predefined strings. \*(-- will
give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
double quote, and \*(R" will give a right double quote. \*(C+ will
give a nicer C++. Capital omega is used to do unbreakable dashes and
therefore won't be available. \*(C` and \*(C' expand to `' in nroff,
nothing in troff, for use with C<>.
.tr \(*W- . ds -- \(*W- . ds PI pi . if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch . if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch . ds L" "" . ds R" "" . ds C` "" . ds C' "" 'br\} . ds -- \|\(em\| . ds PI \(*p . ds L" `` . ds R" '' . ds C` . ds C' 'br\}
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If the F register is >0, we'll generate index entries on stderr for
titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
entries marked with X<> in POD. Of course, you'll have to process the
output yourself in some meaningful fashion.
Avoid warning from groff about undefined register 'F'.
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Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
Fear. Run. Save yourself. No user-serviceable parts.
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Title "SSL_GET_VERSION 3"
SSL_GET_VERSION 3 "2020-09-22" "1.1.1h" "OpenSSL"
For nroff, turn off justification. Always turn off hyphenation; it makesway too many mistakes in technical documents.
"NAME"
SSL_client_version, SSL_get_version, SSL_is_dtls, SSL_version - get the protocol information of a connection
"SYNOPSIS"
Header "SYNOPSIS" .Vb 1
#include <openssl/ssl.h>
\&
int SSL_client_version(const SSL *s);
\&
const char *SSL_get_version(const SSL *ssl);
\&
int SSL_is_dtls(const SSL *ssl);
\&
int SSL_version(const SSL *s);
.Ve
"DESCRIPTION"
Header "DESCRIPTION" \fBSSL_client_version() returns the numeric protocol version advertised by the
client in the legacy_version field of the ClientHello when initiating the
connection. Note that, for \s-1TLS,\s0 this value will never indicate a version greater
than TLSv1.2 even if TLSv1.3 is subsequently negotiated. SSL_get_version()
returns the name of the protocol used for the connection. SSL_version() returns
the numeric protocol version used for the connection. They should only be called
after the initial handshake has been completed. Prior to that the results
returned from these functions may be unreliable.
\fBSSL_is_dtls() returns one if the connection is using \s-1DTLS,\s0 zero if not.
"RETURN VALUES"
Header "RETURN VALUES" \fBSSL_get_version() returns one of the following strings:
"SSLv3" 4
Item "SSLv3" The connection uses the SSLv3 protocol.
"TLSv1" 4
Item "TLSv1" The connection uses the TLSv1.0 protocol.
"TLSv1.1" 4
Item "TLSv1.1" The connection uses the TLSv1.1 protocol.
"TLSv1.2" 4
Item "TLSv1.2" The connection uses the TLSv1.2 protocol.
"TLSv1.3" 4
Item "TLSv1.3" The connection uses the TLSv1.3 protocol.
"unknown" 4
Item "unknown" This indicates an unknown protocol version.
\fBSSL_version() and SSL_client_version() return an integer which could include any of the following:
"\s-1SSL3_VERSION\s0" 4
Item "SSL3_VERSION" The connection uses the SSLv3 protocol.
"\s-1TLS1_VERSION\s0" 4
Item "TLS1_VERSION" The connection uses the TLSv1.0 protocol.
"\s-1TLS1_1_VERSION\s0" 4
Item "TLS1_1_VERSION" The connection uses the TLSv1.1 protocol.
"\s-1TLS1_2_VERSION\s0" 4
Item "TLS1_2_VERSION" The connection uses the TLSv1.2 protocol.
"\s-1TLS1_3_VERSION\s0" 4
Item "TLS1_3_VERSION" The connection uses the TLSv1.3 protocol (never returned for
\fBSSL_client_version()).
"SEE ALSO"
Header "SEE ALSO" \fBssl\|(7)
"HISTORY"
Header "HISTORY" The SSL_is_dtls() function was added in OpenSSL 1.1.0.
"COPYRIGHT"
Header "COPYRIGHT" Copyright 2001-2018 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the OpenSSL license (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>.