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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_CTX_set_tlsext_servername_callback, SSL_CTX_set_tlsext_servername_arg, SSL_get_servername_type, SSL_get_servername \- handle server name indication (SNI) .SH "SYNOPSIS" .IX 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 .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBSSL_CTX_set_tlsext_servername_callback()\fR sets the application callback \fBcb\fR used by a server to perform any actions or configuration required based on the servername extension received in the incoming connection. When \fBcb\fR is \s-1NULL, SNI\s0 is not used. The \fBarg\fR value is a pointer which is passed to the application callback. .PP \&\fBSSL_CTX_set_tlsext_servername_arg()\fR sets a context-specific argument to be passed into the callback for this \fB\s-1SSL_CTX\s0\fR. .PP \&\fBSSL_get_servername()\fR returns a servername extension value of the specified type if provided in the Client Hello or \s-1NULL.\s0 .PP \&\fBSSL_get_servername_type()\fR 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\fR. .SH "NOTES" .IX 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. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBSSL_CTX_set_tlsext_servername_callback()\fR and \&\fBSSL_CTX_set_tlsext_servername_arg()\fR both always return 1 indicating success. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBssl\fR\\|(7), \fBSSL_CTX_set_alpn_select_cb\fR\\|(3), \&\fBSSL_get0_alpn_selected\fR\\|(3) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2017 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>.