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SSL_SESSION_get0_hostname.3
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" 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 .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/ssl.h> \& \& const char *SSL_SESSION_get0_hostname(const SSL_SESSION *s); \& int SSL_SESSION_set1_hostname(SSL_SESSION *s, const char *hostname); \& \& void SSL_SESSION_get0_alpn_selected(const SSL_SESSION *s, \& const unsigned char **alpn, \& size_t *len); \& int SSL_SESSION_set1_alpn_selected(SSL_SESSION *s, const unsigned char *alpn, \& size_t len); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBSSL_SESSION_get0_hostname()\fR retrieves the \s-1SNI\s0 value that was sent by the client when the session was created if it was accepted by the server and TLSv1.2 or below was negotiated. Otherwise \s-1NULL\s0 is returned. Note that in TLSv1.3 the \&\s-1SNI\s0 hostname is negotiated with each handshake including resumption handshakes and is therefore never associated with the session. .PP The value returned is a pointer to memory maintained within \fBs\fR and should not be free'd. .PP \&\fBSSL_SESSION_set1_hostname()\fR sets the \s-1SNI\s0 value for the hostname to a copy of the string provided in hostname. .PP \&\fBSSL_SESSION_get0_alpn_selected()\fR retrieves the selected \s-1ALPN\s0 protocol for this session and its associated length in bytes. The returned value of \fB*alpn\fR is a pointer to memory maintained within \fBs\fR and should not be free'd. .PP \&\fBSSL_SESSION_set1_alpn_selected()\fR sets the \s-1ALPN\s0 protocol for this session to the value in \fBalpn\fR which should be of length \fBlen\fR bytes. A copy of the input value is made, and the caller retains ownership of the memory pointed to by \&\fBalpn\fR. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBSSL_SESSION_get0_hostname()\fR returns either a string or \s-1NULL\s0 based on if there is the \s-1SNI\s0 value sent by client. .PP \&\fBSSL_SESSION_set1_hostname()\fR returns 1 on success or 0 on error. .PP \&\fBSSL_SESSION_set1_alpn_selected()\fR returns 1 on success or 0 on error. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBssl\fR\|(7), \&\fBd2i_SSL_SESSION\fR\|(3), \&\fBSSL_SESSION_get_time\fR\|(3), \&\fBSSL_SESSION_free\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" The \fBSSL_SESSION_set1_hostname()\fR, \fBSSL_SESSION_get0_alpn_selected()\fR and \&\fBSSL_SESSION_set1_alpn_selected()\fR functions were added in OpenSSL 1.1.1. .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2016\-2020 The OpenSSL Project Authors. All Rights Reserved. .PP 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>.
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