196 lines
6.6 KiB
Groff
Executable File
196 lines
6.6 KiB
Groff
Executable File
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.\" ========================================================================
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.\"
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.IX Title "SSL_SESSION_GET0_HOSTNAME 3"
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.TH SSL_SESSION_GET0_HOSTNAME 3 "2020-03-02" "1.1.1e-dev" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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SSL_SESSION_get0_hostname, SSL_SESSION_set1_hostname, SSL_SESSION_get0_alpn_selected, SSL_SESSION_set1_alpn_selected \&\- get and set SNI and ALPN data associated with a session
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/ssl.h>
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\&
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\& const char *SSL_SESSION_get0_hostname(const SSL_SESSION *s);
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\& int SSL_SESSION_set1_hostname(SSL_SESSION *s, const char *hostname);
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\&
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\& void SSL_SESSION_get0_alpn_selected(const SSL_SESSION *s,
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\& const unsigned char **alpn,
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\& size_t *len);
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\& int SSL_SESSION_set1_alpn_selected(SSL_SESSION *s, const unsigned char *alpn,
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\& size_t len);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fISSL_SESSION_get0_hostname()\fR retrieves the \s-1SNI\s0 value that was sent by the
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client when the session was created if it was accepted by the server and TLSv1.2
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or below was negotiated. Otherwise \s-1NULL\s0 is returned. Note that in TLSv1.3 the
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\&\s-1SNI\s0 hostname is negotiated with each handshake including resumption handshakes
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and is therefore never associated with the session.
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.PP
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The value returned is a pointer to memory maintained within \fBs\fR and
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should not be free'd.
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.PP
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\&\fISSL_SESSION_set1_hostname()\fR sets the \s-1SNI\s0 value for the hostname to a copy of
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the string provided in hostname.
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.PP
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\&\fISSL_SESSION_get0_alpn_selected()\fR retrieves the selected \s-1ALPN\s0 protocol for this
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session and its associated length in bytes. The returned value of \fB*alpn\fR is a
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pointer to memory maintained within \fBs\fR and should not be free'd.
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.PP
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\&\fISSL_SESSION_set1_alpn_selected()\fR sets the \s-1ALPN\s0 protocol for this session to the
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value in \fBalpn\fR which should be of length \fBlen\fR bytes. A copy of the input
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value is made, and the caller retains ownership of the memory pointed to by
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\&\fBalpn\fR.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fISSL_SESSION_get0_hostname()\fR returns either a string or \s-1NULL\s0 based on if there
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is the \s-1SNI\s0 value sent by client.
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.PP
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\&\fISSL_SESSION_set1_hostname()\fR returns 1 on success or 0 on error.
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.PP
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\&\fISSL_SESSION_set1_alpn_selected()\fR returns 1 on success or 0 on error.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIssl\fR\|(7),
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\&\fId2i_SSL_SESSION\fR\|(3),
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\&\fISSL_SESSION_get_time\fR\|(3),
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\&\fISSL_SESSION_free\fR\|(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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The \fISSL_SESSION_set1_hostname()\fR, \fISSL_SESSION_get0_alpn_selected()\fR and
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\&\fISSL_SESSION_set1_alpn_selected()\fR functions were added in OpenSSL 1.1.1.
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2016\-2019 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the OpenSSL license (the \*(L"License\*(R"). 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 \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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