/*
 * libwebsockets - small server side websockets and web server implementation
 *
 * Copyright (C) 2010-2014 Andy Green <andy@warmcat.com>
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation:
 *  version 2.1 of the License.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 *  MA  02110-1301  USA
 * 
 * Some or all of this file is based on code from nghttp2, which has the
 * following license.  Since it's more liberal than lws license, you're also
 * at liberty to get the original code from
 * https://github.com/tatsuhiro-t/nghttp2 under his liberal terms alone.
 * 
 * nghttp2 - HTTP/2.0 C Library
 *
 * Copyright (c) 2012 Tatsuhiro Tsujikawa
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#include "private-libwebsockets.h"

#ifndef LWS_NO_SERVER

#if OPENSSL_VERSION_NUMBER >= 0x10002000L
static int alpn_select_proto_cb(SSL* ssl,
                         const unsigned char **out,
                         unsigned char *outlen,
                         const unsigned char *in, unsigned int inlen,
                         void *arg)
{
	lwsl_err((char *)in);
	return SSL_TLSEXT_ERR_OK; /* SSL_TLSEXT_ERR_NOACK */
}
#endif

LWS_VISIBLE void
lws_context_init_http2_ssl(struct libwebsocket_context *context)
{
#if OPENSSL_VERSION_NUMBER >= 0x10002000L
	// ALPN selection callback
	SSL_CTX_set_alpn_select_cb(context->ssl_ctx, alpn_select_proto_cb, NULL);
	lwsl_notice(" HTTP2 / ALPN enabled\n");
#else
	lwsl_notice(" HTTP2 / ALPN configured but not supported by OpenSSL version\n");
#endif // OPENSSL_VERSION_NUMBER >= 0x10002000L
}

#endif