/* 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_core.h

 * @brief CORE HTTP Daemon

 *

 * @defgroup APACHE_CORE_HTTPD Core HTTP Daemon

 * @ingroup  APACHE_CORE

 * @{

 */

#ifndef APACHE_HTTP_CORE_H

#define APACHE_HTTP_CORE_H

#include "apr.h"

#include "apr_hash.h"

#include "apr_optional.h"

#include "util_filter.h"

#include "ap_expr.h"

#include "apr_tables.h"

#include "http_config.h"

#if APR_HAVE_STRUCT_RLIMIT

#include <sys/time.h>

#include <sys/resource.h>

#endif

#ifdef __cplusplus

extern "C" {

#endif

/* ****************************************************************

 *

 * The most basic server code is encapsulated in a single module

 * known as the core, which is just *barely* functional enough to

 * serve documents, though not terribly well.

 *

 * Largely for NCSA back-compatibility reasons, the core needs to

 * make pieces of its config structures available to other modules.

 * The accessors are declared here, along with the interpretation

 * of one of them (allow_options).

 */

/**

 * @defgroup APACHE_CORE_HTTPD_ACESSORS Acessors

 *

 * @brief File/Directory Accessor directives

 *

 * @{

 */

/** No directives */

#define OPT_NONE 0

/** Indexes directive */

#define OPT_INDEXES 1

/** SSI is enabled without exec= permission  */

#define OPT_INCLUDES 2

/**  FollowSymLinks directive */

#define OPT_SYM_LINKS 4

/**  ExecCGI directive */

#define OPT_EXECCGI 8

/**  directive unset */

#define OPT_UNSET 16

/**  SSI exec= permission is permitted, iff OPT_INCLUDES is also set */

#define OPT_INC_WITH_EXEC 32

/** SymLinksIfOwnerMatch directive */

#define OPT_SYM_OWNER 64

/** MultiViews directive */

#define OPT_MULTI 128

/**  All directives */

#define OPT_ALL (OPT_INDEXES|OPT_INCLUDES|OPT_INC_WITH_EXEC|OPT_SYM_LINKS|OPT_EXECCGI)

/** @} */

/**

 * @defgroup get_remote_host Remote Host Resolution

 * @ingroup APACHE_CORE_HTTPD

 * @{

 */

/** REMOTE_HOST returns the hostname, or NULL if the hostname

 * lookup fails.  It will force a DNS lookup according to the

 * HostnameLookups setting.

 */

#define REMOTE_HOST (0)

/** REMOTE_NAME returns the hostname, or the dotted quad if the

 * hostname lookup fails.  It will force a DNS lookup according

 * to the HostnameLookups setting.

 */

#define REMOTE_NAME (1)

/** REMOTE_NOLOOKUP is like REMOTE_NAME except that a DNS lookup is

 * never forced.

 */

#define REMOTE_NOLOOKUP (2)

/** REMOTE_DOUBLE_REV will always force a DNS lookup, and also force

 * a double reverse lookup, regardless of the HostnameLookups

 * setting.  The result is the (double reverse checked) hostname,

 * or NULL if any of the lookups fail.

 */

#define REMOTE_DOUBLE_REV (3)

/** @} // get_remote_host */

/** all of the requirements must be met */

#define SATISFY_ALL 0

/**  any of the requirements must be met */

#define SATISFY_ANY 1

/** There are no applicable satisfy lines */

#define SATISFY_NOSPEC 2

/** Make sure we don't write less than 8000 bytes at any one time.

 */

#define AP_MIN_BYTES_TO_WRITE  8000

/** default maximum of internal redirects */

# define AP_DEFAULT_MAX_INTERNAL_REDIRECTS 10

/** default maximum subrequest nesting level */

# define AP_DEFAULT_MAX_SUBREQ_DEPTH 10

/**

 * Retrieve the value of Options for this request

 * @param r The current request

 * @return the Options bitmask

 */

AP_DECLARE(int) ap_allow_options(request_rec *r);

/**

 * Retrieve the value of the AllowOverride for this request

 * @param r The current request

 * @return the overrides bitmask

 */

AP_DECLARE(int) ap_allow_overrides(request_rec *r);

/**

 * Retrieve the document root for this server

 * @param r The current request

 * @warning Don't use this!  If your request went through a Userdir, or

 * something like that, it'll screw you.  But it's back-compatible...

 * @return The document root

 */

AP_DECLARE(const char *) ap_document_root(request_rec *r);

/**

 * Lookup the remote user agent's DNS name or IP address

 * @ingroup get_remote_hostname

 * @param req The current request

 * @param type The type of lookup to perform.  One of:

 * 

 *     REMOTE_HOST returns the hostname, or NULL if the hostname

 *                 lookup fails.  It will force a DNS lookup according to the

 *                 HostnameLookups setting.

 *     REMOTE_NAME returns the hostname, or the dotted quad if the

 *                 hostname lookup fails.  It will force a DNS lookup according

 *                 to the HostnameLookups setting.

 *     REMOTE_NOLOOKUP is like REMOTE_NAME except that a DNS lookup is

 *                     never forced.

 *     REMOTE_DOUBLE_REV will always force a DNS lookup, and also force

 *                   a double reverse lookup, regardless of the HostnameLookups

 *                   setting.  The result is the (double reverse checked)

 *                   hostname, or NULL if any of the lookups fail.

 * 

 * @param str_is_ip unless NULL is passed, this will be set to non-zero on

 *        output when an IP address string is returned

 * @return The remote hostname (based on the request useragent_ip)

 */

AP_DECLARE(const char *) ap_get_useragent_host(request_rec *req, int type,

                                               int *str_is_ip);

/**

 * Lookup the remote client's DNS name or IP address

 * @ingroup get_remote_host

 * @param conn The current connection

 * @param dir_config The directory config vector from the request

 * @param type The type of lookup to perform.  One of:

 * 

 *     REMOTE_HOST returns the hostname, or NULL if the hostname

 *                 lookup fails.  It will force a DNS lookup according to the

 *                 HostnameLookups setting.

 *     REMOTE_NAME returns the hostname, or the dotted quad if the

 *                 hostname lookup fails.  It will force a DNS lookup according

 *                 to the HostnameLookups setting.

 *     REMOTE_NOLOOKUP is like REMOTE_NAME except that a DNS lookup is

 *                     never forced.

 *     REMOTE_DOUBLE_REV will always force a DNS lookup, and also force

 *                   a double reverse lookup, regardless of the HostnameLookups

 *                   setting.  The result is the (double reverse checked)

 *                   hostname, or NULL if any of the lookups fail.

 * 

 * @param str_is_ip unless NULL is passed, this will be set to non-zero on output when an IP address

 *        string is returned

 * @return The remote hostname (based on the connection client_ip)

 */

AP_DECLARE(const char *) ap_get_remote_host(conn_rec *conn, void *dir_config, int type, int *str_is_ip);

/**

 * Retrieve the login name of the remote user.  Undef if it could not be

 * determined

 * @param r The current request

 * @return The user logged in to the client machine

 */

AP_DECLARE(const char *) ap_get_remote_logname(request_rec *r);

/* Used for constructing self-referencing URLs, and things like SERVER_PORT,

 * and SERVER_NAME.

 */

/**

 * build a fully qualified URL from the uri and information in the request rec

 * @param p The pool to allocate the URL from

 * @param uri The path to the requested file

 * @param r The current request

 * @return A fully qualified URL

 */

AP_DECLARE(char *) ap_construct_url(apr_pool_t *p, const char *uri, request_rec *r);

/**

 * Get the current server name from the request

 * @param r The current request

 * @return the server name

 */

AP_DECLARE(const char *) ap_get_server_name(request_rec *r);

/**

 * Get the current server name from the request for the purposes

 * of using in a URL.  If the server name is an IPv6 literal

 * address, it will be returned in URL format (e.g., "[fe80::1]").

 * @param r The current request

 * @return the server name

 */

AP_DECLARE(const char *) ap_get_server_name_for_url(request_rec *r);

/**

 * Get the current server port

 * @param r The current request

 * @return The server's port

 */

AP_DECLARE(apr_port_t) ap_get_server_port(const request_rec *r);

/**

 * Return the limit on bytes in request msg body

 * @param r The current request

 * @return the maximum number of bytes in the request msg body

 */

AP_DECLARE(apr_off_t) ap_get_limit_req_body(const request_rec *r);

/**

 * Return the limit on bytes in XML request msg body

 * @param r The current request

 * @return the maximum number of bytes in XML request msg body

 */

AP_DECLARE(apr_size_t) ap_get_limit_xml_body(const request_rec *r);

/**

 * Install a custom response handler for a given status

 * @param r The current request

 * @param status The status for which the custom response should be used

 * @param string The custom response.  This can be a static string, a file

 *               or a URL

 */

AP_DECLARE(void) ap_custom_response(request_rec *r, int status, const char *string);

/**

 * Check if the current request is beyond the configured max. number of redirects or subrequests

 * @param r The current request

 * @return true (is exceeded) or false

 */

AP_DECLARE(int) ap_is_recursion_limit_exceeded(const request_rec *r);

/**

 * Check for a definition from the server command line

 * @param name The define to check for

 * @return 1 if defined, 0 otherwise

 */

AP_DECLARE(int) ap_exists_config_define(const char *name);

/* FIXME! See STATUS about how */

AP_DECLARE_NONSTD(int) ap_core_translate(request_rec *r);

/* Authentication stuff.  This is one of the places where compatibility

 * with the old config files *really* hurts; they don't discriminate at

 * all between different authentication schemes, meaning that we need

 * to maintain common state for all of them in the core, and make it

 * available to the other modules through interfaces.

 */

/** @see require_line */

typedef struct require_line require_line;

/**

 * @brief A structure to keep track of authorization requirements

*/

struct require_line {

    /** Where the require line is in the config file. */

    apr_int64_t method_mask;

    /** The complete string from the command line */

    char *requirement;

};

/**

 * Return the type of authorization required for this request

 * @param r The current request

 * @return The authorization required

 */

AP_DECLARE(const char *) ap_auth_type(request_rec *r);

/**

 * Return the current Authorization realm

 * @param r The current request

 * @return The current authorization realm

 */

AP_DECLARE(const char *) ap_auth_name(request_rec *r);

/**

 * How the requires lines must be met.

 * @param r The current request

 * @return How the requirements must be met.  One of:

 * 

 *      SATISFY_ANY    -- any of the requirements must be met.

 *      SATISFY_ALL    -- all of the requirements must be met.

 *      SATISFY_NOSPEC -- There are no applicable satisfy lines

 * 

 */

AP_DECLARE(int) ap_satisfies(request_rec *r);

/**

 * Core is also unlike other modules in being implemented in more than

 * one file... so, data structures are declared here, even though most of

 * the code that cares really is in http_core.c.  Also, another accessor.

 */

AP_DECLARE_DATA extern module core_module;

/**

 * Accessor for core_module's specific data. Equivalent to

 * ap_get_module_config(cv, &core_module) but more efficient.

 * @param cv The vector in which the modules configuration is stored.

 *        usually r->per_dir_config or s->module_config

 * @return The module-specific data

 */

AP_DECLARE(void *) ap_get_core_module_config(const ap_conf_vector_t *cv);

/**

 * Accessor to set core_module's specific data. Equivalent to

 * ap_set_module_config(cv, &core_module, val) but more efficient.

 * @param cv The vector in which the modules configuration is stored.

 *        usually r->per_dir_config or s->module_config

 * @param val The module-specific data to set

 */

AP_DECLARE(void) ap_set_core_module_config(ap_conf_vector_t *cv, void *val);

/** Get the socket from the core network filter. This should be used instead of

 * accessing the core connection config directly.

 * @param c The connection record

 * @return The socket

 */

AP_DECLARE(apr_socket_t *) ap_get_conn_socket(conn_rec *c);

#ifndef AP_DEBUG

#define AP_CORE_MODULE_INDEX  0

#define ap_get_core_module_config(v) \

    (((void **)(v))[AP_CORE_MODULE_INDEX])

#define ap_set_core_module_config(v, val) \

    ((((void **)(v))[AP_CORE_MODULE_INDEX]) = (val))

#else

#define AP_CORE_MODULE_INDEX  (AP_DEBUG_ASSERT(core_module.module_index == 0), 0)

#endif

/**

 * @brief  Per-request configuration

*/

typedef struct {

    /** bucket brigade used by getline for look-ahead and

     * ap_get_client_block for holding left-over request body */

    struct apr_bucket_brigade *bb;

    /** an array of per-request working data elements, accessed

     * by ID using ap_get_request_note()

     * (Use ap_register_request_note() during initialization

     * to add elements)

     */

    void **notes;

    /** Custom response strings registered via ap_custom_response(),

     * or NULL; check per-dir config if nothing found here

     */

    char **response_code_strings; /* from ap_custom_response(), not from

                                   * ErrorDocument

                                   */

    /** per-request document root of the server. This allows mass vhosting

     * modules better compatibility with some scripts. Normally the

     * context_* info should be used instead */

    const char *document_root;

    /*

     * more fine-grained context information which is set by modules like

     * mod_alias and mod_userdir

     */

    /** the context root directory on disk for the current resource,

     *  without trailing slash

     */

    const char *context_document_root;

    /** the URI prefix that corresponds to the context_document_root directory,

     *  without trailing slash

     */

    const char *context_prefix;

    /** There is a script processor installed on the output filter chain,

     * so it needs the default_handler to deliver a (script) file into

     * the chain so it can process it. Normally, default_handler only

     * serves files on a GET request (assuming the file is actual content),

     * since other methods are not content-retrieval. This flag overrides

     * that behavior, stating that the "content" is actually a script and

     * won't actually be delivered as the response for the non-GET method.

     */

    int deliver_script;

    /** Should addition of charset= be suppressed for this request?

     */

    int suppress_charset;

} core_request_config;

/* Standard entries that are guaranteed to be accessible via

 * ap_get_request_note() for each request (additional entries

 * can be added with ap_register_request_note())

 */

#define AP_NOTE_DIRECTORY_WALK 0

#define AP_NOTE_LOCATION_WALK  1

#define AP_NOTE_FILE_WALK      2

#define AP_NOTE_IF_WALK        3

#define AP_NUM_STD_NOTES       4

/**

 * Reserve an element in the core_request_config->notes array

 * for some application-specific data

 * @return An integer key that can be passed to ap_get_request_note()

 *         during request processing to access this element for the

 *         current request.

 */

AP_DECLARE(apr_size_t) ap_register_request_note(void);

/**

 * Retrieve a pointer to an element in the core_request_config->notes array

 * @param r The request

 * @param note_num  A key for the element: either a value obtained from

 *        ap_register_request_note() or one of the predefined AP_NOTE_*

 *        values.

 * @return NULL if the note_num is invalid, otherwise a pointer to the

 *         requested note element.

 * @remark At the start of a request, each note element is NULL.  The

 *         handle provided by ap_get_request_note() is a pointer-to-pointer

 *         so that the caller can point the element to some app-specific

 *         data structure.  The caller should guarantee that any such

 *         structure will last as long as the request itself.

 */

AP_DECLARE(void **) ap_get_request_note(request_rec *r, apr_size_t note_num);

typedef unsigned char allow_options_t;

typedef unsigned int overrides_t;

/*

 * Bits of info that go into making an ETag for a file

 * document.  Why a long?  Because char historically

 * proved too short for Options, and int can be different

 * sizes on different platforms.

 */

typedef unsigned long etag_components_t;

#define ETAG_UNSET 0

#define ETAG_NONE  (1 << 0)

#define ETAG_MTIME (1 << 1)

#define ETAG_INODE (1 << 2)

#define ETAG_SIZE  (1 << 3)

#define ETAG_ALL   (ETAG_MTIME | ETAG_INODE | ETAG_SIZE)

/* This is the default value used */

#define ETAG_BACKWARD (ETAG_MTIME | ETAG_SIZE)

/* Generic ON/OFF/UNSET for unsigned int foo :2 */

#define AP_CORE_CONFIG_OFF   (0)

#define AP_CORE_CONFIG_ON    (1)

#define AP_CORE_CONFIG_UNSET (2)

/* Generic merge of flag */

#define AP_CORE_MERGE_FLAG(field, to, base, over) to->field = \

               over->field != AP_CORE_CONFIG_UNSET            \

               ? over->field                                  \

               : base->field                                   

/**

 * @brief Server Signature Enumeration

 */

typedef enum {

    srv_sig_unset,

    srv_sig_off,

    srv_sig_on,

    srv_sig_withmail

} server_signature_e;

/**

 * @brief Per-directory configuration

 */

typedef struct {

    /** path of the directory/regex/etc. see also d_is_fnmatch/absolute below */

    char *d;

    /** the number of slashes in d */

    unsigned d_components;

    /** If (opts & OPT_UNSET) then no absolute assignment to options has

     * been made.

     * invariant: (opts_add & opts_remove) == 0

     * Which said another way means that the last relative (options + or -)

     * assignment made to each bit is recorded in exactly one of opts_add

     * or opts_remove.

     */

    allow_options_t opts;

    allow_options_t opts_add;

    allow_options_t opts_remove;

    overrides_t override;

    allow_options_t override_opts;

    /* Used to be the custom response config. No longer used. */

    char **response_code_strings; /* from ErrorDocument, not from

                                   * ap_custom_response() */

    /* Hostname resolution etc */

#define HOSTNAME_LOOKUP_OFF     0

#define HOSTNAME_LOOKUP_ON      1

#define HOSTNAME_LOOKUP_DOUBLE  2

#define HOSTNAME_LOOKUP_UNSET   3

    unsigned int hostname_lookups : 4;

    unsigned int content_md5 : 2;  /* calculate Content-MD5? */

#define USE_CANONICAL_NAME_OFF   (0)

#define USE_CANONICAL_NAME_ON    (1)

#define USE_CANONICAL_NAME_DNS   (2)

#define USE_CANONICAL_NAME_UNSET (3)

    unsigned use_canonical_name : 2;

    /* since is_fnmatch(conf->d) was being called so frequently in

     * directory_walk() and its relatives, this field was created and

     * is set to the result of that call.

     */

    unsigned d_is_fnmatch : 1;

    /* should we force a charset on any outgoing parameterless content-type?

     * if so, which charset?

     */

#define ADD_DEFAULT_CHARSET_OFF   (0)

#define ADD_DEFAULT_CHARSET_ON    (1)

#define ADD_DEFAULT_CHARSET_UNSET (2)

    unsigned add_default_charset : 2;

    const char *add_default_charset_name;

    /* System Resource Control */

#ifdef RLIMIT_CPU

    struct rlimit *limit_cpu;

#endif

#if defined (RLIMIT_DATA) || defined (RLIMIT_VMEM) || defined(RLIMIT_AS)

    struct rlimit *limit_mem;

#endif

#ifdef RLIMIT_NPROC

    struct rlimit *limit_nproc;

#endif

    apr_off_t limit_req_body;      /* limit on bytes in request msg body */

    long limit_xml_body;           /* limit on bytes in XML request msg body */

    /* logging options */

    server_signature_e server_signature;

    /* Access control */

    apr_array_header_t *sec_file;

    apr_array_header_t *sec_if;

    ap_regex_t *r;

    const char *mime_type;       /* forced with ForceType  */

    const char *handler;         /* forced by something other than SetHandler */

    const char *output_filters;  /* forced with SetOutputFilters */

    const char *input_filters;   /* forced with SetInputFilters */

    int accept_path_info;        /* forced with AcceptPathInfo */

    /*

     * What attributes/data should be included in ETag generation?

     */

    etag_components_t etag_bits;

    etag_components_t etag_add;

    etag_components_t etag_remove;

    /*

     * Run-time performance tuning

     */

#define ENABLE_MMAP_OFF    (0)

#define ENABLE_MMAP_ON     (1)

#define ENABLE_MMAP_UNSET  (2)

    unsigned int enable_mmap : 2;  /* whether files in this dir can be mmap'ed */

#define ENABLE_SENDFILE_OFF    (0)

#define ENABLE_SENDFILE_ON     (1)

#define ENABLE_SENDFILE_UNSET  (2)

    unsigned int enable_sendfile : 2;  /* files in this dir can be sendfile'ed */

#define USE_CANONICAL_PHYS_PORT_OFF   (0)

#define USE_CANONICAL_PHYS_PORT_ON    (1)

#define USE_CANONICAL_PHYS_PORT_UNSET (2)

    unsigned int use_canonical_phys_port : 2;

    unsigned int allow_encoded_slashes : 1; /* URLs may contain %2f w/o being

                                             * pitched indiscriminately */

    unsigned int decode_encoded_slashes : 1; /* whether to decode encoded slashes in URLs */

#define AP_CONDITION_IF        1

#define AP_CONDITION_ELSE      2

#define AP_CONDITION_ELSEIF    (AP_CONDITION_ELSE|AP_CONDITION_IF)

    unsigned int condition_ifelse : 2; /* is this an <If>, <ElseIf>, or <Else> */

    ap_expr_info_t *condition;   /* Conditionally merge <If> sections */

    /** per-dir log config */

    struct ap_logconf *log;

    /** Table of directives allowed per AllowOverrideList */

    apr_table_t *override_list;

#define AP_MAXRANGES_UNSET     -1

#define AP_MAXRANGES_DEFAULT   -2

#define AP_MAXRANGES_UNLIMITED -3

#define AP_MAXRANGES_NORANGES   0

    /** Number of Ranges before returning HTTP_OK. **/

    int max_ranges;

    /** Max number of Range overlaps (merges) allowed **/

    int max_overlaps;

    /** Max number of Range reversals (eg: 200-300, 100-125) allowed **/

    int max_reversals;

    /** Named back references */

    apr_array_header_t *refs;

    /** Custom response config with expression support. The hash table

     * contains compiled expressions keyed against the custom response

     * code.

     */

    apr_hash_t *response_code_exprs;

#define AP_CGI_PASS_AUTH_OFF     (0)

#define AP_CGI_PASS_AUTH_ON      (1)

#define AP_CGI_PASS_AUTH_UNSET   (2)

    /** CGIPassAuth: Whether HTTP authorization headers will be passed to

     * scripts as CGI variables; affects all modules calling

     * ap_add_common_vars(), as well as any others using this field as 

     * advice

     */

    unsigned int cgi_pass_auth : 2;

    unsigned int qualify_redirect_url :2;

    ap_expr_info_t  *expr_handler;         /* forced with SetHandler */

    /** Table of rules for building CGI variables, NULL if none configured */

    apr_hash_t *cgi_var_rules;

} core_dir_config;

/* macro to implement off by default behaviour */

#define AP_SENDFILE_ENABLED(x) \

    ((x) == ENABLE_SENDFILE_ON ? APR_SENDFILE_ENABLED : 0)

/* Per-server core configuration */

typedef struct {

    char *gprof_dir;

    /* Name translations --- we want the core to be able to do *something*

     * so it's at least a minimally functional web server on its own (and

     * can be tested that way).  But let's keep it to the bare minimum:

     */

    const char *ap_document_root;

    /* Access control */

    char *access_name;

    apr_array_header_t *sec_dir;

    apr_array_header_t *sec_url;

    /* recursion backstopper */

    int redirect_limit; /* maximum number of internal redirects */

    int subreq_limit;   /* maximum nesting level of subrequests */

    const char *protocol;

    apr_table_t *accf_map;

    /* array of ap_errorlog_format_item for error log format string */

    apr_array_header_t *error_log_format;

    /*

     * two arrays of arrays of ap_errorlog_format_item for additional information

     * logged to the error log once per connection/request

     */

    apr_array_header_t *error_log_conn;

    apr_array_header_t *error_log_req;

    /* TRACE control */

#define AP_TRACE_UNSET    -1

#define AP_TRACE_DISABLE   0

#define AP_TRACE_ENABLE    1

#define AP_TRACE_EXTENDED  2

    int trace_enable;

#define AP_MERGE_TRAILERS_UNSET    0

#define AP_MERGE_TRAILERS_ENABLE   1

#define AP_MERGE_TRAILERS_DISABLE  2

    int merge_trailers;

    apr_array_header_t *protocols;

    int protocols_honor_order;

#define AP_HTTP09_UNSET   0

#define AP_HTTP09_ENABLE  1

#define AP_HTTP09_DISABLE 2

    char http09_enable;

#define AP_HTTP_CONFORMANCE_UNSET     0

#define AP_HTTP_CONFORMANCE_UNSAFE    1

#define AP_HTTP_CONFORMANCE_STRICT    2

    char http_conformance;

#define AP_HTTP_METHODS_UNSET         0

#define AP_HTTP_METHODS_LENIENT       1

#define AP_HTTP_METHODS_REGISTERED    2

    char http_methods;

} core_server_config;

/* for AddOutputFiltersByType in core.c */

void ap_add_output_filters_by_type(request_rec *r);

/* for http_config.c */

void ap_core_reorder_directories(apr_pool_t *, server_rec *);

/* for mod_perl */

AP_CORE_DECLARE(void) ap_add_per_dir_conf(server_rec *s, void *dir_config);

AP_CORE_DECLARE(void) ap_add_per_url_conf(server_rec *s, void *url_config);

AP_CORE_DECLARE(void) ap_add_file_conf(apr_pool_t *p, core_dir_config *conf, void *url_config);

AP_CORE_DECLARE(const char *) ap_add_if_conf(apr_pool_t *p, core_dir_config *conf, void *url_config);

AP_CORE_DECLARE_NONSTD(const char *) ap_limit_section(cmd_parms *cmd, void *dummy, const char *arg);

/* Core filters; not exported. */

apr_status_t ap_core_input_filter(ap_filter_t *f, apr_bucket_brigade *b,

                                  ap_input_mode_t mode, apr_read_type_e block,

                                  apr_off_t readbytes);

apr_status_t ap_core_output_filter(ap_filter_t *f, apr_bucket_brigade *b);

AP_DECLARE(const char*) ap_get_server_protocol(server_rec* s);

AP_DECLARE(void) ap_set_server_protocol(server_rec* s, const char* proto);

typedef struct core_output_filter_ctx core_output_filter_ctx_t;

typedef struct core_filter_ctx        core_ctx_t;

typedef struct core_net_rec {

    /** Connection to the client */

    apr_socket_t *client_socket;

    /** connection record */

    conn_rec *c;

    core_output_filter_ctx_t *out_ctx;

    core_ctx_t *in_ctx;

} core_net_rec;

/**

 * Insert the network bucket into the core input filter's input brigade.

 * This hook is intended for MPMs or protocol modules that need to do special

 * socket setup.

 * @param c The connection

 * @param bb The brigade to insert the bucket into

 * @param socket The socket to put into a bucket

 * @return AP_DECLINED if the current function does not handle this connection,

 *         APR_SUCCESS or an error otherwise.

 */

AP_DECLARE_HOOK(apr_status_t, insert_network_bucket,

                (conn_rec *c, apr_bucket_brigade *bb, apr_socket_t *socket))

/* ----------------------------------------------------------------------

 *

 * Runtime status/management

 */

typedef enum {

    ap_mgmt_type_string,

    ap_mgmt_type_long,

    ap_mgmt_type_hash

} ap_mgmt_type_e;

typedef union {

    const char *s_value;

    long i_value;

    apr_hash_t *h_value;

} ap_mgmt_value;

typedef struct {

    const char *description;

    const char *name;

    ap_mgmt_type_e vtype;

    ap_mgmt_value v;

} ap_mgmt_item_t;

/* Handles for core filters */

AP_DECLARE_DATA extern ap_filter_rec_t *ap_subreq_core_filter_handle;

AP_DECLARE_DATA extern ap_filter_rec_t *ap_core_output_filter_handle;

AP_DECLARE_DATA extern ap_filter_rec_t *ap_content_length_filter_handle;

AP_DECLARE_DATA extern ap_filter_rec_t *ap_core_input_filter_handle;

/**

 * This hook provdes a way for modules to provide metrics/statistics about

 * their operational status.

 *

 * @param p A pool to use to create entries in the hash table

 * @param val The name of the parameter(s) that is wanted. This is

 *            tree-structured would be in the form ('*' is all the tree,

 *            'module.*' all of the module , 'module.foo.*', or

 *            'module.foo.bar' )

 * @param ht The hash table to store the results. Keys are item names, and

 *           the values point to ap_mgmt_item_t structures.

 * @ingroup hooks

 */

AP_DECLARE_HOOK(int, get_mgmt_items,

                (apr_pool_t *p, const char * val, apr_hash_t *ht))

/* ---------------------------------------------------------------------- */

/* ----------------------------------------------------------------------

 *

 * I/O logging with mod_logio

 */

APR_DECLARE_OPTIONAL_FN(void, ap_logio_add_bytes_out,

                        (conn_rec *c, apr_off_t bytes));

APR_DECLARE_OPTIONAL_FN(void, ap_logio_add_bytes_in,

                        (conn_rec *c, apr_off_t bytes));

APR_DECLARE_OPTIONAL_FN(apr_off_t, ap_logio_get_last_bytes, (conn_rec *c));

/* ----------------------------------------------------------------------

 *

 * Error log formats

 */

/**

 * The info structure passed to callback functions of errorlog handlers.

 * Not all information is available in all contexts. In particular, all

 * pointers may be NULL.

 */

typedef struct ap_errorlog_info {

    /** current server_rec.

     *  Should be preferred over c->base_server and r->server

     */

    const server_rec *s;

    /** current conn_rec.

     *  Should be preferred over r->connection

     */

    const conn_rec *c;

    /** current request_rec. */

    const request_rec *r;

    /** r->main if r is a subrequest, otherwise equal to r */