Adding upstream version 2.4.38.upstream/2.4.38

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 630 insertions, 0 deletions

diff --git a/include/http_request.h b/include/http_request.h
new file mode 100644
index 0000000..0013d39
--- /dev/null
+++ b/include/http_request.h
@@ -0,0 +1,630 @@
+/* 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 http_request.h
+ * @brief Apache Request library
+ *
+ * @defgroup APACHE_CORE_REQ Apache Request Processing
+ * @ingroup  APACHE_CORE
+ * @{
+ */
+
+/*
+ * request.c is the code which handles the main line of request
+ * processing, once a request has been read in (finding the right per-
+ * directory configuration, building it if necessary, and calling all
+ * the module dispatch functions in the right order).
+ *
+ * The pieces here which are public to the modules, allow them to learn
+ * how the server would handle some other file or URI, or perhaps even
+ * direct the server to serve that other file instead of the one the
+ * client requested directly.
+ *
+ * There are two ways to do that.  The first is the sub_request mechanism,
+ * which handles looking up files and URIs as adjuncts to some other
+ * request (e.g., directory entries for multiviews and directory listings);
+ * the lookup functions stop short of actually running the request, but
+ * (e.g., for includes), a module may call for the request to be run
+ * by calling run_sub_req.  The space allocated to create sub_reqs can be
+ * reclaimed by calling destroy_sub_req --- be sure to copy anything you care
+ * about which was allocated in its apr_pool_t elsewhere before doing this.
+ */
+
+#ifndef APACHE_HTTP_REQUEST_H
+#define APACHE_HTTP_REQUEST_H
+
+#include "apr_optional.h"
+#include "util_filter.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define AP_SUBREQ_NO_ARGS 0
+#define AP_SUBREQ_MERGE_ARGS 1
+
+/**
+ * An internal handler used by the ap_process_request, all subrequest mechanisms
+ * and the redirect mechanism.
+ * @param r The request, subrequest or internal redirect to pre-process
+ * @return The return code for the request
+ */
+AP_DECLARE(int) ap_process_request_internal(request_rec *r);
+
+/**
+ * Create a subrequest from the given URI.  This subrequest can be
+ * inspected to find information about the requested URI
+ * @param new_uri The URI to lookup
+ * @param r The current request
+ * @param next_filter The first filter the sub_request should use.  If this is
+ *                    NULL, it defaults to the first filter for the main request
+ * @return The new request record
+ */
+AP_DECLARE(request_rec *) ap_sub_req_lookup_uri(const char *new_uri,
+                                                const request_rec *r,
+                                                ap_filter_t *next_filter);
+
+/**
+ * Create a subrequest for the given file.  This subrequest can be
+ * inspected to find information about the requested file
+ * @param new_file The file to lookup
+ * @param r The current request
+ * @param next_filter The first filter the sub_request should use.  If this is
+ *                    NULL, it defaults to the first filter for the main request
+ * @return The new request record
+ */
+AP_DECLARE(request_rec *) ap_sub_req_lookup_file(const char *new_file,
+                                              const request_rec *r,
+                                              ap_filter_t *next_filter);
+/**
+ * Create a subrequest for the given apr_dir_read result.  This subrequest
+ * can be inspected to find information about the requested file
+ * @param finfo The apr_dir_read result to lookup
+ * @param r The current request
+ * @param subtype What type of subrequest to perform, one of;
+ * <PRE>
+ *      AP_SUBREQ_NO_ARGS     ignore r->args and r->path_info
+ *      AP_SUBREQ_MERGE_ARGS  merge r->args and r->path_info
+ * </PRE>
+ * @param next_filter The first filter the sub_request should use.  If this is
+ *                    NULL, it defaults to the first filter for the main request
+ * @return The new request record
+ * @note The apr_dir_read flags value APR_FINFO_MIN|APR_FINFO_NAME flag is the
+ * minimum recommended query if the results will be passed to apr_dir_read.
+ * The file info passed must include the name, and must have the same relative
+ * directory as the current request.
+ */
+AP_DECLARE(request_rec *) ap_sub_req_lookup_dirent(const apr_finfo_t *finfo,
+                                                   const request_rec *r,
+                                                   int subtype,
+                                                   ap_filter_t *next_filter);
+/**
+ * Create a subrequest for the given URI using a specific method.  This
+ * subrequest can be inspected to find information about the requested URI
+ * @param method The method to use in the new subrequest
+ * @param new_uri The URI to lookup
+ * @param r The current request
+ * @param next_filter The first filter the sub_request should use.  If this is
+ *                    NULL, it defaults to the first filter for the main request
+ * @return The new request record
+ */
+AP_DECLARE(request_rec *) ap_sub_req_method_uri(const char *method,
+                                                const char *new_uri,
+                                                const request_rec *r,
+                                                ap_filter_t *next_filter);
+/**
+ * An output filter to strip EOS buckets from sub-requests.  This always
+ * has to be inserted at the end of a sub-requests filter stack.
+ * @param f The current filter
+ * @param bb The brigade to filter
+ * @return status code
+ */
+AP_CORE_DECLARE_NONSTD(apr_status_t) ap_sub_req_output_filter(ap_filter_t *f,
+                                                        apr_bucket_brigade *bb);
+
+/**
+ * Run the handler for the subrequest
+ * @param r The subrequest to run
+ * @return The return code for the subrequest
+ */
+AP_DECLARE(int) ap_run_sub_req(request_rec *r);
+
+/**
+ * Free the memory associated with a subrequest
+ * @param r The subrequest to finish
+ */
+AP_DECLARE(void) ap_destroy_sub_req(request_rec *r);
+
+/*
+ * Then there's the case that you want some other request to be served
+ * as the top-level request INSTEAD of what the client requested directly.
+ * If so, call this from a handler, and then immediately return OK.
+ */
+
+/**
+ * Redirect the current request to some other uri
+ * @param new_uri The URI to replace the current request with
+ * @param r The current request
+ */
+AP_DECLARE(void) ap_internal_redirect(const char *new_uri, request_rec *r);
+
+/**
+ * This function is designed for things like actions or CGI scripts, when
+ * using AddHandler, and you want to preserve the content type across
+ * an internal redirect.
+ * @param new_uri The URI to replace the current request with.
+ * @param r The current request
+ */
+AP_DECLARE(void) ap_internal_redirect_handler(const char *new_uri, request_rec *r);
+
+/**
+ * Redirect the current request to a sub_req, merging the pools
+ * @param sub_req A subrequest created from this request
+ * @param r The current request
+ * @note the sub_req's pool will be merged into r's pool, be very careful
+ * not to destroy this subrequest, it will be destroyed with the main request!
+ */
+AP_DECLARE(void) ap_internal_fast_redirect(request_rec *sub_req, request_rec *r);
+
+/**
+ * Can be used within any handler to determine if any authentication
+ * is required for the current request
+ * @param r The current request
+ * @return 1 if authentication is required, 0 otherwise
+ * @bug Behavior changed in 2.4.x refactoring, API no longer usable
+ * @deprecated @see ap_some_authn_required()
+ */
+AP_DECLARE(int) ap_some_auth_required(request_rec *r);
+
+/**
+ * @defgroup APACHE_CORE_REQ_AUTH Access Control for Sub-Requests and
+ *                                Internal Redirects
+ * @ingroup  APACHE_CORE_REQ
+ * @{
+ */
+
+#define AP_AUTH_INTERNAL_PER_URI  0  /**< Run access control hooks on all
+                                          internal requests with URIs
+                                          distinct from that of initial
+                                          request */
+#define AP_AUTH_INTERNAL_PER_CONF 1  /**< Run access control hooks only on
+                                          internal requests with
+                                          configurations distinct from
+                                          that of initial request */
+#define AP_AUTH_INTERNAL_MASK     0x000F  /**< mask to extract internal request
+                                               processing mode */
+
+/**
+ * Clear flag which determines when access control hooks will be run for
+ * internal requests.
+ */
+AP_DECLARE(void) ap_clear_auth_internal(void);
+
+/**
+ * Determine whether access control hooks will be run for all internal
+ * requests with URIs distinct from that of the initial request, or only
+ * those for which different configurations apply than those which applied
+ * to the initial request.  To accommodate legacy external modules which
+ * may expect access control hooks to be run for all internal requests
+ * with distinct URIs, this is the default behaviour unless all access
+ * control hooks and authentication and authorization providers are
+ * registered with AP_AUTH_INTERNAL_PER_CONF.
+ * @param ptemp Pool used for temporary allocations
+ */
+AP_DECLARE(void) ap_setup_auth_internal(apr_pool_t *ptemp);
+
+/**
+ * Register an authentication or authorization provider with the global
+ * provider pool.
+ * @param pool The pool to create any storage from
+ * @param provider_group The group to store the provider in
+ * @param provider_name The name for this provider
+ * @param provider_version The version for this provider
+ * @param provider Opaque structure for this provider
+ * @param type Internal request processing mode, either
+ *             AP_AUTH_INTERNAL_PER_URI or AP_AUTH_INTERNAL_PER_CONF
+ * @return APR_SUCCESS if all went well
+ */
+AP_DECLARE(apr_status_t) ap_register_auth_provider(apr_pool_t *pool,
+                                                   const char *provider_group,
+                                                   const char *provider_name,
+                                                   const char *provider_version,
+                                                   const void *provider,
+                                                   int type);
+
+/** @} */
+
+/* Optional functions coming from mod_authn_core and mod_authz_core
+ * that list all registered authn/z providers.
+ */
+APR_DECLARE_OPTIONAL_FN(apr_array_header_t *, authn_ap_list_provider_names,
+                        (apr_pool_t *ptemp));
+APR_DECLARE_OPTIONAL_FN(apr_array_header_t *, authz_ap_list_provider_names,
+                        (apr_pool_t *ptemp));
+
+/**
+ * Determine if the current request is the main request or a subrequest
+ * @param r The current request
+ * @return 1 if this is the main request, 0 otherwise
+ */
+AP_DECLARE(int) ap_is_initial_req(request_rec *r);
+
+/**
+ * Function to set the r->mtime field to the specified value if it's later
+ * than what's already there.
+ * @param r The current request
+ * @param dependency_mtime Time to set the mtime to
+ */
+AP_DECLARE(void) ap_update_mtime(request_rec *r, apr_time_t dependency_mtime);
+
+/**
+ * Add one or more methods to the list permitted to access the resource.
+ * Usually executed by the content handler before the response header is
+ * sent, but sometimes invoked at an earlier phase if a module knows it
+ * can set the list authoritatively.  Note that the methods are ADDED
+ * to any already permitted unless the reset flag is non-zero.  The
+ * list is used to generate the Allow response header field when it
+ * is needed.
+ * @param   r     The pointer to the request identifying the resource.
+ * @param   reset Boolean flag indicating whether this list should
+ *                completely replace any current settings.
+ * @param   ...   A NULL-terminated list of strings, each identifying a
+ *                method name to add.
+ * @return  None.
+ */
+AP_DECLARE(void) ap_allow_methods(request_rec *r, int reset, ...)
+                 AP_FN_ATTR_SENTINEL;
+
+/**
+ * Add one or more methods to the list permitted to access the resource.
+ * Usually executed by the content handler before the response header is
+ * sent, but sometimes invoked at an earlier phase if a module knows it
+ * can set the list authoritatively.  Note that the methods are ADDED
+ * to any already permitted unless the reset flag is non-zero.  The
+ * list is used to generate the Allow response header field when it
+ * is needed.
+ * @param   r     The pointer to the request identifying the resource.
+ * @param   reset Boolean flag indicating whether this list should
+ *                completely replace any current settings.
+ * @param   ...   A list of method identifiers, from the "M_" series
+ *                defined in httpd.h, terminated with a value of -1
+ *                (e.g., "M_GET, M_POST, M_OPTIONS, -1")
+ * @return  None.
+ */
+AP_DECLARE(void) ap_allow_standard_methods(request_rec *r, int reset, ...);
+
+#define MERGE_ALLOW 0
+#define REPLACE_ALLOW 1
+
+/**
+ * Process a top-level request from a client, and synchronously write
+ * the response to the client
+ * @param r The current request
+ */
+AP_DECLARE(void) ap_process_request(request_rec *r);
+
+/* For post-processing after a handler has finished with a request.
+ * (Commonly used after it was suspended)
+ */
+AP_DECLARE(void) ap_process_request_after_handler(request_rec *r);
+
+/**
+ * Process a top-level request from a client, allowing some or all of
+ * the response to remain buffered in the core output filter for later,
+ * asynchronous write completion
+ * @param r The current request
+ */
+void ap_process_async_request(request_rec *r);
+
+/**
+ * Kill the current request
+ * @param type Why the request is dieing
+ * @param r The current request
+ */
+AP_DECLARE(void) ap_die(int type, request_rec *r);
+
+/**
+ * Check whether a connection is still established and has data available,
+ * optionnaly consuming blank lines ([CR]LF).
+ * @param c The current connection
+ * @param bb The brigade to filter
+ * @param max_blank_lines Max number of blank lines to consume, or zero
+ *                        to consider them as data (single read).
+ * @return APR_SUCCESS: connection established with data available,
+ *         APR_EAGAIN: connection established and empty,
+ *         APR_NOTFOUND: too much blank lines,
+ *         APR_E*: connection/general error.
+ */
+AP_DECLARE(apr_status_t) ap_check_pipeline(conn_rec *c, apr_bucket_brigade *bb,
+                                           unsigned int max_blank_lines);
+
+/* Hooks */
+
+/**
+ * Gives modules a chance to create their request_config entry when the
+ * request is created.
+ * @param r The current request
+ * @ingroup hooks
+ */
+AP_DECLARE_HOOK(int,create_request,(request_rec *r))
+
+/**
+ * This hook allow modules an opportunity to translate the URI into an
+ * actual filename.  If no modules do anything special, the server's default
+ * rules will be followed.
+ * @param r The current request
+ * @return OK, DECLINED, or HTTP_...
+ * @ingroup hooks
+ */
+AP_DECLARE_HOOK(int,translate_name,(request_rec *r))
+
+/**
+ * This hook allow modules to set the per_dir_config based on their own
+ * context (such as "<Proxy>" sections) and responds to contextless requests
+ * such as TRACE that need no security or filesystem mapping.
+ * based on the filesystem.
+ * @param r The current request
+ * @return DONE (or HTTP_) if this contextless request was just fulfilled
+ * (such as TRACE), OK if this is not a file, and DECLINED if this is a file.
+ * The core map_to_storage (HOOK_RUN_REALLY_LAST) will directory_walk
+ * and file_walk the r->filename.
+ *
+ * @ingroup hooks
+ */
+AP_DECLARE_HOOK(int,map_to_storage,(request_rec *r))
+
+/**
+ * This hook is used to analyze the request headers, authenticate the user,
+ * and set the user information in the request record (r->user and
+ * r->ap_auth_type). This hook is only run when Apache determines that
+ * authentication/authorization is required for this resource (as determined
+ * by the 'Require' directive). It runs after the access_checker hook, and
+ * before the auth_checker hook. This hook should be registered with
+ * ap_hook_check_authn().
+ *
+ * @param r The current request
+ * @return OK, DECLINED, or HTTP_...
+ * @ingroup hooks
+ * @see ap_hook_check_authn
+ */
+AP_DECLARE_HOOK(int,check_user_id,(request_rec *r))
+
+/**
+ * Allows modules to perform module-specific fixing of header fields.  This
+ * is invoked just before any content-handler
+ * @param r The current request
+ * @return OK, DECLINED, or HTTP_...
+ * @ingroup hooks
+ */
+AP_DECLARE_HOOK(int,fixups,(request_rec *r))
+
+/**
+ * This routine is called to determine and/or set the various document type
+ * information bits, like Content-type (via r->content_type), language, et
+ * cetera.
+ * @param r the current request
+ * @return OK, DECLINED, or HTTP_...
+ * @ingroup hooks
+ */
+AP_DECLARE_HOOK(int,type_checker,(request_rec *r))
+
+/**
+ * This hook is used to apply additional access control to this resource.
+ * It runs *before* a user is authenticated, so this hook is really to
+ * apply additional restrictions independent of a user. It also runs
+ * independent of 'Require' directive usage. This hook should be registered
+ * with ap_hook_check_access().
+ *
+ * @param r the current request
+ * @return OK, DECLINED, or HTTP_...
+ * @ingroup hooks
+ * @see ap_hook_check_access
+ */
+AP_DECLARE_HOOK(int,access_checker,(request_rec *r))
+
+/**
+ * This hook is used to apply additional access control and/or bypass
+ * authentication for this resource. It runs *before* a user is authenticated,
+ * but after the auth_checker hook.
+ * This hook should be registered with ap_hook_check_access_ex().
+ *
+ * @param r the current request
+ * @return OK (allow acces), DECLINED (let later modules decide),
+ *         or HTTP_... (deny access)
+ * @ingroup hooks
+ * @see ap_hook_check_access_ex
+ */
+AP_DECLARE_HOOK(int,access_checker_ex,(request_rec *r))
+
+/**
+ * This hook is used to check to see if the resource being requested
+ * is available for the authenticated user (r->user and r->ap_auth_type).
+ * It runs after the access_checker and check_user_id hooks. Note that
+ * it will *only* be called if Apache determines that access control has
+ * been applied to this resource (through a 'Require' directive). This
+ * hook should be registered with ap_hook_check_authz().
+ *
+ * @param r the current request
+ * @return OK, DECLINED, or HTTP_...
+ * @ingroup hooks
+ * @see ap_hook_check_authz
+ */
+AP_DECLARE_HOOK(int,auth_checker,(request_rec *r))
+
+/**
+ * Register a hook function that will apply additional access control to
+ * the current request.
+ * @param pf An access_checker hook function
+ * @param aszPre A NULL-terminated array of strings that name modules whose
+ *               hooks should precede this one
+ * @param aszSucc A NULL-terminated array of strings that name modules whose
+ *                hooks should succeed this one
+ * @param nOrder An integer determining order before honouring aszPre and
+ *               aszSucc (for example, HOOK_MIDDLE)
+ * @param type Internal request processing mode, either
+ *             AP_AUTH_INTERNAL_PER_URI or AP_AUTH_INTERNAL_PER_CONF
+ */
+AP_DECLARE(void) ap_hook_check_access(ap_HOOK_access_checker_t *pf,
+                                      const char * const *aszPre,
+                                      const char * const *aszSucc,
+                                      int nOrder, int type);
+
+/**
+ * Register a hook function that will apply additional access control
+ * and/or bypass authentication for the current request.
+ * @param pf An access_checker_ex hook function
+ * @param aszPre A NULL-terminated array of strings that name modules whose
+ *               hooks should precede this one
+ * @param aszSucc A NULL-terminated array of strings that name modules whose
+ *                hooks should succeed this one
+ * @param nOrder An integer determining order before honouring aszPre and
+ *               aszSucc (for example, HOOK_MIDDLE)
+ * @param type Internal request processing mode, either
+ *             AP_AUTH_INTERNAL_PER_URI or AP_AUTH_INTERNAL_PER_CONF
+ */
+AP_DECLARE(void) ap_hook_check_access_ex(ap_HOOK_access_checker_ex_t *pf,
+                                         const char * const *aszPre,
+                                         const char * const *aszSucc,
+                                         int nOrder, int type);
+
+
+/**
+ * Register a hook function that will analyze the request headers,
+ * authenticate the user, and set the user information in the request record.
+ * @param pf A check_user_id hook function
+ * @param aszPre A NULL-terminated array of strings that name modules whose
+ *               hooks should precede this one
+ * @param aszSucc A NULL-terminated array of strings that name modules whose
+ *                hooks should succeed this one
+ * @param nOrder An integer determining order before honouring aszPre and
+ *               aszSucc (for example, HOOK_MIDDLE)
+ * @param type Internal request processing mode, either
+ *             AP_AUTH_INTERNAL_PER_URI or AP_AUTH_INTERNAL_PER_CONF
+ */
+AP_DECLARE(void) ap_hook_check_authn(ap_HOOK_check_user_id_t *pf,
+                                     const char * const *aszPre,
+                                     const char * const *aszSucc,
+                                     int nOrder, int type);
+
+/**
+ * Register a hook function that determine if the resource being requested
+ * is available for the currently authenticated user.
+ * @param pf An auth_checker hook function
+ * @param aszPre A NULL-terminated array of strings that name modules whose
+ *               hooks should precede this one
+ * @param aszSucc A NULL-terminated array of strings that name modules whose
+ *                hooks should succeed this one
+ * @param nOrder An integer determining order before honouring aszPre and
+ *               aszSucc (for example, HOOK_MIDDLE)
+ * @param type Internal request processing mode, either
+ *             AP_AUTH_INTERNAL_PER_URI or AP_AUTH_INTERNAL_PER_CONF
+ */
+AP_DECLARE(void) ap_hook_check_authz(ap_HOOK_auth_checker_t *pf,
+                                     const char * const *aszPre,
+                                     const char * const *aszSucc,
+                                     int nOrder, int type);
+
+/**
+ * This hook allows modules to insert filters for the current request
+ * @param r the current request
+ * @ingroup hooks
+ */
+AP_DECLARE_HOOK(void,insert_filter,(request_rec *r))
+
+/**
+ * This hook allows modules to affect the request immediately after the
+ * per-directory configuration for the request has been generated.
+ * @param r The current request
+ * @return OK (allow acces), DECLINED (let later modules decide),
+ *         or HTTP_... (deny access)
+ * @ingroup hooks
+ */
+AP_DECLARE_HOOK(int,post_perdir_config,(request_rec *r))
+
+/**
+ * This hook allows a module to force authn to be required when
+ * processing a request.
+ * This hook should be registered with ap_hook_force_authn().
+ * @param r The current request
+ * @return OK (force authn), DECLINED (let later modules decide)
+ * @ingroup hooks
+ */
+AP_DECLARE_HOOK(int,force_authn,(request_rec *r))
+
+/**
+ * This hook allows modules to handle/emulate the apr_stat() calls
+ * needed for directory walk.
+ * @param finfo where to put the stat data
+ * @param r The current request
+ * @param wanted APR_FINFO_* flags to pass to apr_stat()
+ * @return apr_status_t or AP_DECLINED (let later modules decide)
+ * @ingroup hooks
+ */
+AP_DECLARE_HOOK(apr_status_t,dirwalk_stat,(apr_finfo_t *finfo, request_rec *r, apr_int32_t wanted))
+
+AP_DECLARE(int) ap_location_walk(request_rec *r);
+AP_DECLARE(int) ap_directory_walk(request_rec *r);
+AP_DECLARE(int) ap_file_walk(request_rec *r);
+AP_DECLARE(int) ap_if_walk(request_rec *r);
+
+/** End Of REQUEST (EOR) bucket */
+AP_DECLARE_DATA extern const apr_bucket_type_t ap_bucket_type_eor;
+
+/**
+ * Determine if a bucket is an End Of REQUEST (EOR) bucket
+ * @param e The bucket to inspect
+ * @return true or false
+ */
+#define AP_BUCKET_IS_EOR(e)         (e->type == &ap_bucket_type_eor)
+
+/**
+ * Make the bucket passed in an End Of REQUEST (EOR) bucket
+ * @param b The bucket to make into an EOR bucket
+ * @param r The request to destroy when this bucket is destroyed
+ * @return The new bucket, or NULL if allocation failed
+ */
+AP_DECLARE(apr_bucket *) ap_bucket_eor_make(apr_bucket *b, request_rec *r);
+
+/**
+ * Create a bucket referring to an End Of REQUEST (EOR). This bucket
+ * holds a pointer to the request_rec, so that the request can be
+ * destroyed right after all of the output has been sent to the client.
+ *
+ * @param list The freelist from which this bucket should be allocated
+ * @param r The request to destroy when this bucket is destroyed
+ * @return The new bucket, or NULL if allocation failed
+ */
+AP_DECLARE(apr_bucket *) ap_bucket_eor_create(apr_bucket_alloc_t *list,
+                                              request_rec *r);
+
+/**
+ * Can be used within any handler to determine if any authentication
+ * is required for the current request.  Note that if used with an
+ * access_checker hook, an access_checker_ex hook or an authz provider; the
+ * caller should take steps to avoid a loop since this function is
+ * implemented by calling these hooks.
+ * @param r The current request
+ * @return TRUE if authentication is required, FALSE otherwise
+ */
+AP_DECLARE(int) ap_some_authn_required(request_rec *r);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  /* !APACHE_HTTP_REQUEST_H */
+/** @} */