http_request.h revision 12b170a812f740fafc96da32a188a8b2761a3d5c
/* 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
*/
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 accomodate 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, ...);
/**
* 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
*/
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);
/* 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))
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);
#ifdef __cplusplus
}
#endif
#endif /* !APACHE_HTTP_REQUEST_H */
/** @} */