Edit File: http_request.h
/* 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 * * 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_hooks.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 */ AP_DECLARE(int) ap_some_auth_required(request_rec *r); /** * 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, ...); /** * 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 #ifdef CORE_PRIVATE /** * Function called by main.c to handle first-level request * @param r The current request */ void ap_process_request(request_rec *); /** * 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); #endif /* 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. * * @param r The current request * @return OK, DECLINED, or HTTP_... * @ingroup hooks */ 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. * * @param r the current request * @return OK, DECLINED, or HTTP_... * @ingroup hooks */ AP_DECLARE_HOOK(int,access_checker,(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). * * @param r the current request * @return OK, DECLINED, or HTTP_... * @ingroup hooks */ AP_DECLARE_HOOK(int,auth_checker,(request_rec *r)) /** * 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)) 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); #ifdef __cplusplus } #endif #endif /* !APACHE_HTTP_REQUEST_H */
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