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Title "SSL_SESSION_GET0_HOSTNAME 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
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 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 Header "DESCRIPTION" \fBSSL_SESSION_get0_hostname() 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.

The value returned is a pointer to memory maintained within s and should not be free'd.

\fBSSL_SESSION_set1_hostname() sets the \s-1SNI\s0 value for the hostname to a copy of the string provided in hostname.

\fBSSL_SESSION_get0_alpn_selected() retrieves the selected \s-1ALPN\s0 protocol for this session and its associated length in bytes. The returned value of *alpn is a pointer to memory maintained within s and should not be free'd.

\fBSSL_SESSION_set1_alpn_selected() sets the \s-1ALPN\s0 protocol for this session to the value in alpn which should be of length len bytes. A copy of the input value is made, and the caller retains ownership of the memory pointed to by \fBalpn.

Header "RETURN VALUES" \fBSSL_SESSION_get0_hostname() returns either a string or \s-1NULL\s0 based on if there is the \s-1SNI\s0 value sent by client.

\fBSSL_SESSION_set1_hostname() returns 1 on success or 0 on error.

\fBSSL_SESSION_set1_alpn_selected() returns 1 on success or 0 on error.

Header "SEE ALSO" \fBssl\|(7), \fBd2i_SSL_SESSION\|(3), \fBSSL_SESSION_get_time\|(3), \fBSSL_SESSION_free\|(3) Header "HISTORY" The SSL_SESSION_set1_hostname(), SSL_SESSION_get0_alpn_selected() and \fBSSL_SESSION_set1_alpn_selected() functions were added in OpenSSL 1.1.1. Header "COPYRIGHT" Copyright 2016-2020 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>.