http_request.h revision 3cd826b00280881e5a2f03d8ec1f8d55802b93de
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000-2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
*
* Portions of this software are based upon public domain software
* originally written at the National Center for Supercomputing Applications,
* University of Illinois, Urbana-Champaign.
*/
#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
/**
* @file http_request.h
* @brief Apache Request library
*/
/* http_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.
*/
/**
* An internal handler used by the ap_process_request, all sub request mechanisms
* and the redirect mechanism.
* @param r The request, subrequest or internal redirect to pre-process
* @return The return code for the request
*/
/**
* Create a sub request from the given URI. This sub request can be
* inspected to find information about the requested URI
* @param new_file 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
* @deffunc request_rec * ap_sub_req_lookup_uri(const char *new_file, const request_rec *r)
*/
const request_rec *r,
/**
* Create a sub request for the given file. This sub request can be
* inspected to find information about the requested file
* @param new_file 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
* @deffunc request_rec * ap_sub_req_lookup_file(const char *new_file, const request_rec *r)
*/
const request_rec *r,
/**
* Create a sub request for the given apr_dir_read result. This sub request
* 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
* @deffunc request_rec * ap_sub_req_lookup_dirent(apr_finfo_t *finfo, int subtype, const request_rec *r)
* @tip 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.
*/
const request_rec *r,
int subtype,
/**
* Create a sub request for the given URI using a specific method. This
* sub request can be inspected to find information about the requested URI
* @param method The method to use in the new sub request
* @param new_file 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
* @deffunc request_rec * ap_sub_req_method_uri(const char *method, const char *new_file, const request_rec *r)
*/
const char *new_file,
const request_rec *r,
/**
* 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
* @deffunc apr_status_t ap_sub_req_output_filter(ap_filter_t *f, apr_bucket_brigade *bb)
*/
/**
* Run the handler for the sub request
* @param r The sub request to run
* @return The return code for the sub request
* @deffunc int ap_run_sub_req(request_rec *r)
*/
/**
* Free the memory associated with a sub request
* @param r The sub request to finish
* @deffunc 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
* @deffunc 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
* @deffunc 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
* @deffunc void ap_internal_fast_redirect(request_rec *sub_req, request_rec *r)
* @tip 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!
*/
/**
* 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
* @deffunc int ap_some_auth_required(request_rec *r)
*/
/**
* Determine if the current request is the main request or a sub requests
* @param r The current request
* @retrn 1 if this is a main request, 0 otherwise
* @deffunc 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_time Time to set the mtime to
* @deffunc 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.
* @deffunc 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.
* @deffunc 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 */
void ap_process_request(request_rec *);
/**
* Kill the current request
* @param type Why the request is dieing
* @param r The current request
* @deffunc 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
*/
/**
* 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
*/
/**
* 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_LAST) will directory_walk and file_walk
* the r->filename.
*
* @ingroup hooks
*/
/**
* This hook allows modules to check the authentication information sent with
* the request.
* @param r The current request
* @return OK, DECLINED, or HTTP_...
* @ingroup hooks
*/
/**
* 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
*/
/**
* information bits, like Content-type (via r->content_type), language, et
* cetera.
* @param r the current request
* @return OK, DECLINED, or HTTP_...
* @ingroup hooks
*/
/**
* This routine is called to check for any module-specific restrictions placed
* upon the requested resource.
* @param r the current request
* @return OK, DECLINED, or HTTP_...
* @ingroup hooks
*/
/**
* This routine is called to check to see if the resource being requested
* requires authorisation.
* @param r the current request
* @return OK, DECLINED, or HTTP_...
* @ingroup hooks
*/
/**
* This hook allows modules to insert filters for the current request
* @param r the current request
* @ingroup hooks
*/
#ifdef __cplusplus
}
#endif
#endif /* !APACHE_HTTP_REQUEST_H */