Automatically generated by Pod::Man 4.10 (Pod::Simple 3.35)

Standard preamble:
========================================================================
..

..

.. 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\}
Escape single quotes in literal strings from groff's Unicode transform.

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'.
.. .nr rF 0 . if \nF \{\ . de IX . tm Index:\\$1\t\\n%\t"\\$2" .. . if !\nF==2 \{\ . nr % 0 . nr F 2 . \} . \} .\} .rr rF
Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
Fear. Run. Save yourself. No user-serviceable parts.
. \" fudge factors for nroff and troff . ds #H 0 . ds #V .8m . ds #F .3m . ds #[ \f1 . ds #] .\} . ds #H ((1u-(\\\\n(.fu%2u))*.13m) . ds #V .6m . ds #F 0 . ds #[ \& . ds #] \& .\} . \" simple accents for nroff and troff . ds ' \& . ds ` \& . ds ^ \& . ds , \& . ds ~ ~ . ds / .\} . ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u" . ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u' . ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u' . ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u' . ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u' . ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u' .\} . \" troff and (daisy-wheel) nroff accents . \" corrections for vroff . \" for low resolution devices (crt and lpr) \{\ . ds : e . ds 8 ss . ds o a . ds d- d\h'-1'\(ga . ds D- D\h'-1'\(hy . ds th \o'bp' . ds Th \o'LP' . ds ae ae . ds Ae AE .\} ========================================================================

Title "SSL_CTX_set_tlsext_servername_callback 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
SSL_CTX_set_tlsext_servername_callback, SSL_CTX_set_tlsext_servername_arg, SSL_get_servername_type, SSL_get_servername - handle server name indication (SNI) Header "SYNOPSIS" .Vb 1 #include <openssl/ssl.h> \& long SSL_CTX_set_tlsext_servername_callback(SSL_CTX *ctx, int (*cb)(SSL *, int *, void *)); long SSL_CTX_set_tlsext_servername_arg(SSL_CTX *ctx, void *arg); \& const char *SSL_get_servername(const SSL *s, const int type); int SSL_get_servername_type(const SSL *s); .Ve Header "DESCRIPTION" \fBSSL_CTX_set_tlsext_servername_callback() sets the application callback cb used by a server to perform any actions or configuration required based on the servername extension received in the incoming connection. When cb is \s-1NULL, SNI\s0 is not used. The arg value is a pointer which is passed to the application callback.

\fBSSL_CTX_set_tlsext_servername_arg() sets a context-specific argument to be passed into the callback for this \s-1SSL_CTX\s0.

\fBSSL_get_servername() returns a servername extension value of the specified type if provided in the Client Hello or \s-1NULL.\s0

\fBSSL_get_servername_type() returns the servername type or -1 if no servername is present. Currently the only supported type (defined in \s-1RFC3546\s0) is \fBTLSEXT_NAMETYPE_host_name.

Header "NOTES" The \s-1ALPN\s0 and \s-1SNI\s0 callbacks are both executed during Client Hello processing. The servername callback is executed first, followed by the \s-1ALPN\s0 callback. Header "RETURN VALUES" \fBSSL_CTX_set_tlsext_servername_callback() and \fBSSL_CTX_set_tlsext_servername_arg() both always return 1 indicating success. Header "SEE ALSO" \fBssl\|(7), SSL_CTX_set_alpn_select_cb\|(3), \fBSSL_get0_alpn_selected\|(3) Header "COPYRIGHT" Copyright 2017 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>.