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diff --git a/modules/ssl/mod_ssl.h b/modules/ssl/mod_ssl.h
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+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @file mod_ssl.h
+ * @brief SSL extension module for Apache
+ *
+ * @defgroup MOD_SSL mod_ssl
+ * @ingroup  APACHE_MODS
+ * @{
+ */
+
+#ifndef __MOD_SSL_H__
+#define __MOD_SSL_H__
+
+#include "httpd.h"
+#include "http_config.h"
+#include "apr_optional.h"
+
+/* Create a set of SSL_DECLARE(type), SSL_DECLARE_NONSTD(type) and
+ * SSL_DECLARE_DATA with appropriate export and import tags for the platform
+ */
+#if !defined(WIN32)
+#define SSL_DECLARE(type)            type
+#define SSL_DECLARE_NONSTD(type)     type
+#define SSL_DECLARE_DATA
+#elif defined(SSL_DECLARE_STATIC)
+#define SSL_DECLARE(type)            type __stdcall
+#define SSL_DECLARE_NONSTD(type)     type
+#define SSL_DECLARE_DATA
+#elif defined(SSL_DECLARE_EXPORT)
+#define SSL_DECLARE(type)            __declspec(dllexport) type __stdcall
+#define SSL_DECLARE_NONSTD(type)     __declspec(dllexport) type
+#define SSL_DECLARE_DATA             __declspec(dllexport)
+#else
+#define SSL_DECLARE(type)            __declspec(dllimport) type __stdcall
+#define SSL_DECLARE_NONSTD(type)     __declspec(dllimport) type
+#define SSL_DECLARE_DATA             __declspec(dllimport)
+#endif
+
+/** The ssl_var_lookup() optional function retrieves SSL environment
+ * variables. */
+APR_DECLARE_OPTIONAL_FN(char *, ssl_var_lookup,
+                        (apr_pool_t *, server_rec *,
+                         conn_rec *, request_rec *,
+                         char *));
+
+/** The ssl_ext_list() optional function attempts to build an array
+ * of all the values contained in the named X.509 extension. The
+ * returned array will be created in the supplied pool.
+ * The client certificate is used if peer is non-zero; the server
+ * certificate is used otherwise.
+ * Extension specifies the extensions to use as a string. This can be
+ * one of the "known" long or short names, or a numeric OID,
+ * e.g. "1.2.3.4", 'nsComment' and 'DN' are all valid.
+ * A pointer to an apr_array_header_t structure is returned if at
+ * least one matching extension is found, NULL otherwise.
+ */
+APR_DECLARE_OPTIONAL_FN(apr_array_header_t *, ssl_ext_list,
+                        (apr_pool_t *p, conn_rec *c, int peer,
+                         const char *extension));
+
+/** An optional function which returns non-zero if the given connection
+ * is using SSL/TLS. */
+APR_DECLARE_OPTIONAL_FN(int, ssl_is_https, (conn_rec *));
+
+/** The ssl_proxy_enable() and ssl_engine_{set,disable}() optional
+ * functions are used by mod_proxy to enable use of SSL for outgoing
+ * connections. */
+
+APR_DECLARE_OPTIONAL_FN(int, ssl_proxy_enable, (conn_rec *));
+APR_DECLARE_OPTIONAL_FN(int, ssl_engine_disable, (conn_rec *));
+APR_DECLARE_OPTIONAL_FN(int, ssl_engine_set, (conn_rec *,
+                                              ap_conf_vector_t *,
+                                              int proxy, int enable));
+
+#endif /* __MOD_SSL_H__ */
+/** @} */