http_core.h

Apache HTTP Server 是一个功能强大的灵活的与HTTP/1.1相兼容的web服务器.这里给出的是Apache HTTP服务器的源码。

     */
    void **notes;

    /* 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;

    /* 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
                                   */
} 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_NUM_STD_NOTES       3

/**
 * 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);

/* Per-directory configuration */

typedef unsigned char allow_options_t;
typedef unsigned char 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_BACKWARD (ETAG_MTIME | ETAG_INODE | ETAG_SIZE)
#define ETAG_ALL   (ETAG_MTIME | ETAG_INODE | ETAG_SIZE)

typedef enum {
    srv_sig_unset,
    srv_sig_off,
    srv_sig_on,
    srv_sig_withmail
} server_signature_e;

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;
    
    /* MIME typing --- the core doesn't do anything at all with this,
     * but it does know what to slap on a request for a document which
     * goes untyped by other mechanisms before it slips out the door...
     */
    
    char *ap_default_type;
  
    /* Authentication stuff.  Groan... */
    
    int *satisfy; /* for every method one */
    char *ap_auth_type;
    char *ap_auth_name;
    apr_array_header_t *ap_requires;

    /* Custom response config. These can contain text or a URL to redirect to.
     * if response_code_strings is NULL then there are none in the config,
     * if it's not null then it's allocated to sizeof(char*)*RESPONSE_CODES.
     * This lets us do quick merges in merge_core_dir_configs().
     */
  
    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;

    signed int do_rfc1413 : 2;   /* See if client is advertising a username? */

    signed 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;

    int loglevel;
    
    /* Access control */
    apr_array_header_t *sec_file;
    regex_t *r;

    const char *mime_type;       /* forced with ForceType  */
    const char *handler;         /* forced with SetHandler */
    const char *output_filters;  /* forced with SetOutputFilters */
    const char *input_filters;   /* forced with SetInputFilters */
    int accept_path_info;        /* forced with AcceptPathInfo */

    apr_hash_t *ct_output_filters; /* added with AddOutputFilterByType */

    /*
     * 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 mmap'ed */
    unsigned int allow_encoded_slashes : 1; /* URLs may contain %2f w/o being
                                             * pitched indiscriminately */
} core_dir_config;

/* Per-server core configuration */

typedef struct {
  
#ifdef GPROF
    char *gprof_dir;
#endif

    /* 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 */
} 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(core_dir_config *conf, void *url_config);
AP_CORE_DECLARE_NONSTD(const char *) ap_limit_section(cmd_parms *cmd, void *dummy, const char *arg);

#endif


/* ----------------------------------------------------------------------
 *
 * 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 */
extern AP_DECLARE_DATA ap_filter_rec_t *ap_subreq_core_filter_handle;
extern AP_DECLARE_DATA ap_filter_rec_t *ap_core_output_filter_handle;
extern AP_DECLARE_DATA ap_filter_rec_t *ap_content_length_filter_handle;
extern AP_DECLARE_DATA ap_filter_rec_t *ap_net_time_filter_handle;
extern AP_DECLARE_DATA 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));

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

#ifdef __cplusplus
}
#endif

#endif	/* !APACHE_HTTP_CORE_H */