include/httpd.h

/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2000 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
 *    the documentation and/or other materials provided with the
 *    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
 * <http://www.apache.org/>.
 *
 * 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_HTTPD_H
#define APACHE_HTTPD_H

#ifdef __cplusplus
extern "C" {
#endif

/*
 * httpd.h: header for simple (ha! not anymore) http daemon
 */

/* XXX - We need to push more stuff to other .h files, or even .c files, to
 * make this file smaller
 */

/**
 * @package HTTP Daemon routines
 */

/* Headers in which EVERYONE has an interest... */
#include "ap_config.h"
#include "os.h"
#include "apr_general.h"
#include "apr_lib.h"
#include "apr_time.h"
#include "apr_network_io.h"
#include "ap_mmn.h"

#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif

#ifdef CORE_PRIVATE

/* ----------------------------- config dir ------------------------------ */

/* Define this to be the default server home dir. Most things later in this
 * file with a relative pathname will have this added.
 */
#ifndef HTTPD_ROOT
#ifdef OS2
/* Set default for OS/2 file system */
#define HTTPD_ROOT "/os2httpd"
#elif defined(WIN32)
/* Set default for Windows file system */
#define HTTPD_ROOT "/apache"
#elif defined (BEOS)
/* Set the default for BeOS */
#define HTTPD_ROOT "/boot/home/apache"
#else
#define HTTPD_ROOT "/usr/local/apache"
#endif
#endif /* HTTPD_ROOT */

/* 
 * --------- You shouldn't have to edit anything below this line ----------
 *
 * Any modifications to any defaults not defined above should be done in the 
 * respective configuration file. 
 *
 */

/* Default location of documents.  Can be overridden by the DocumentRoot
 * directive.
 */
#ifndef DOCUMENT_LOCATION
#ifdef OS2
/* Set default for OS/2 file system */
#define DOCUMENT_LOCATION  HTTPD_ROOT "/docs"
#else
#define DOCUMENT_LOCATION  HTTPD_ROOT "/htdocs"
#endif
#endif /* DOCUMENT_LOCATION */

/* Maximum number of dynamically loaded modules */
#ifndef DYNAMIC_MODULE_LIMIT
#define DYNAMIC_MODULE_LIMIT 64
#endif

/* Default administrator's address */
#define DEFAULT_ADMIN "[no address given]"

/* The target name of the installed Apache */
#ifndef TARGET
#define TARGET "httpd"
#endif

/* --------- Default user name and group name ----------------------------- */
/* --- These may be specified as numbers by placing a # before a number --- */

#ifndef DEFAULT_USER
#define DEFAULT_USER "#-1"
#endif
#ifndef DEFAULT_GROUP
#define DEFAULT_GROUP "#-1"
#endif

/* The name of the log files */
#ifndef DEFAULT_XFERLOG
#if defined(OS2) || defined(WIN32)
#define DEFAULT_XFERLOG "logs/access.log"
#else
#define DEFAULT_XFERLOG "logs/access_log"
#endif
#endif /* DEFAULT_XFERLOG */

#ifndef DEFAULT_ERRORLOG
#if defined(OS2) || defined(WIN32)
#define DEFAULT_ERRORLOG "logs/error.log"
#else
#define DEFAULT_ERRORLOG "logs/error_log"
#endif
#endif /* DEFAULT_ERRORLOG */

/* Define this to be what your per-directory security files are called */
#ifndef DEFAULT_ACCESS_FNAME
#ifdef OS2
/* Set default for OS/2 file system */
#define DEFAULT_ACCESS_FNAME "htaccess"
#else
#define DEFAULT_ACCESS_FNAME ".htaccess"
#endif
#endif /* DEFAULT_ACCESS_FNAME */

/* The name of the server config file */
#ifndef SERVER_CONFIG_FILE
#define SERVER_CONFIG_FILE "conf/httpd.conf"
#endif

/* Whether we should enable rfc1413 identity checking */
#ifndef DEFAULT_RFC1413
#define DEFAULT_RFC1413 0
#endif

/* The default path for CGI scripts if none is currently set */
#ifndef DEFAULT_PATH
#define DEFAULT_PATH "/bin:/usr/bin:/usr/ucb:/usr/bsd:/usr/local/bin"
#endif

/* The path to the suExec wrapper, can be overridden in Configuration */
#ifndef SUEXEC_BIN
#define SUEXEC_BIN  HTTPD_ROOT "/sbin/suexec"
#endif

/* The timeout for waiting for messages */
#ifndef DEFAULT_TIMEOUT
#define DEFAULT_TIMEOUT 300 
#endif

/* The timeout for waiting for keepalive timeout until next request */
#ifndef DEFAULT_KEEPALIVE_TIMEOUT
#define DEFAULT_KEEPALIVE_TIMEOUT 15
#endif

/* The number of requests to entertain per connection */
#ifndef DEFAULT_KEEPALIVE
#define DEFAULT_KEEPALIVE 100
#endif

/* The maximum length of the queue of pending connections, as defined
 * by listen(2).  Under some systems, it should be increased if you
 * are experiencing a heavy TCP SYN flood attack.
 *
 * It defaults to 511 instead of 512 because some systems store it 
 * as an 8-bit datatype; 512 truncated to 8-bits is 0, while 511 is 
 * 255 when truncated.
 */

#ifndef DEFAULT_LISTENBACKLOG
#define DEFAULT_LISTENBACKLOG 511
#endif

/* Limits on the size of various request items.  These limits primarily
 * exist to prevent simple denial-of-service attacks on a server based
 * on misuse of the protocol.  The recommended values will depend on the
 * nature of the server resources -- CGI scripts and database backends
 * might require large values, but most servers could get by with much
 * smaller limits than we use below.  The request message body size can
 * be limited by the per-dir config directive LimitRequestBody.
 *
 * Internal buffer sizes are two bytes more than the DEFAULT_LIMIT_REQUEST_LINE
 * and DEFAULT_LIMIT_REQUEST_FIELDSIZE below, which explains the 8190.
 * These two limits can be lowered (but not raised) by the server config
 * directives LimitRequestLine and LimitRequestFieldsize, respectively.
 *
 * DEFAULT_LIMIT_REQUEST_FIELDS can be modified or disabled (set = 0) by
 * the server config directive LimitRequestFields.
 */
#ifndef DEFAULT_LIMIT_REQUEST_LINE
#define DEFAULT_LIMIT_REQUEST_LINE 8190
#endif /* default limit on bytes in Request-Line (Method+URI+HTTP-version) */
#ifndef DEFAULT_LIMIT_REQUEST_FIELDSIZE
#define DEFAULT_LIMIT_REQUEST_FIELDSIZE 8190
#endif /* default limit on bytes in any one header field  */
#ifndef DEFAULT_LIMIT_REQUEST_FIELDS
#define DEFAULT_LIMIT_REQUEST_FIELDS 100
#endif /* default limit on number of request header fields */


/*
 * The default default character set name to add if AddDefaultCharset is
 * enabled.  Overridden with AddDefaultCharsetName.
 */
#define DEFAULT_ADD_DEFAULT_CHARSET_NAME "iso-8859-1"

/*
 * The below defines the base string of the Server: header. Additional
 * tokens can be added via the ap_add_version_component() API call.
 *
 * The tokens are listed in order of their significance for identifying the
 * application.
 *
 * "Product tokens should be short and to the point -- use of them for 
 * advertizing or other non-essential information is explicitly forbidden."
 *
 * Example: "Apache/1.1.0 MrWidget/0.1-alpha" 
 */

/* Define this to 1 if you want fancy indexing, 0 otherwise */
#ifndef DEFAULT_INDEXING
#define DEFAULT_INDEXING 0
#endif
#endif /* CORE_PRIVATE */

#define AP_SERVER_BASEVENDOR "Apache Software Foundation"
#define AP_SERVER_BASEPRODUCT "Apache"
#define AP_SERVER_BASEREVISION "2.0a8"
#define AP_SERVER_BASEVERSION AP_SERVER_BASEPRODUCT "/" AP_SERVER_BASEREVISION
#define AP_SERVER_VERSION  AP_SERVER_BASEVERSION

#define AP_SERVER_PROTOCOL "HTTP/1.1"


/* ------------------ stuff that modules are allowed to look at ----------- */

/* Define this to be what your HTML directory content files are called */
#ifndef AP_DEFAULT_INDEX
#define AP_DEFAULT_INDEX "index.html"
#endif


/* Define this to be what type you'd like returned for files with unknown */
/* suffixes.  MUST be all lower case. */
#ifndef DEFAULT_CONTENT_TYPE
#define DEFAULT_CONTENT_TYPE "text/plain"
#endif

/* The name of the MIME types file */
#ifndef AP_TYPES_CONFIG_FILE
#define AP_TYPES_CONFIG_FILE "conf/mime.types"
#endif

/*
 * Define the HTML doctype strings centrally.
 */
#define DOCTYPE_HTML_2_0  "<!DOCTYPE HTML PUBLIC \"-//IETF//" \
                          "DTD HTML 2.0//EN\">\n"
#define DOCTYPE_HTML_3_2  "<!DOCTYPE HTML PUBLIC \"-//W3C//" \
                          "DTD HTML 3.2 Final//EN\">\n"
#define DOCTYPE_HTML_4_0S "<!DOCTYPE HTML PUBLIC \"-//W3C//" \
                          "DTD HTML 4.0//EN\"\n" \
                          "\"http://www.w3.org/TR/REC-html40/strict.dtd\">\n"
#define DOCTYPE_HTML_4_0T "<!DOCTYPE HTML PUBLIC \"-//W3C//" \
                          "DTD HTML 4.0 Transitional//EN\"\n" \
                          "\"http://www.w3.org/TR/REC-html40/loose.dtd\">\n"
#define DOCTYPE_HTML_4_0F "<!DOCTYPE HTML PUBLIC \"-//W3C//" \
                          "DTD HTML 4.0 Frameset//EN\"\n" \
                          "\"http://www.w3.org/TR/REC-html40/frameset.dtd\">\n"

/* -- Internal representation for a HTTP protocol number, e.g., HTTP/1.1 -- */

#define HTTP_VERSION(major,minor) (1000*(major)+(minor))
#define HTTP_VERSION_MAJOR(number) ((number)/1000)
#define HTTP_VERSION_MINOR(number) ((number)%1000)

/* -------------- Port number for server running standalone --------------- */

#define DEFAULT_HTTP_PORT	80
#define DEFAULT_HTTPS_PORT	443
#define ap_is_default_port(port,r)	((port) == ap_default_port(r))
#define ap_http_method(r)	ap_run_http_method(r)
#define ap_default_port(r)	ap_run_default_port(r)

/* The default string lengths */
#define MAX_STRING_LEN HUGE_STRING_LEN
#define HUGE_STRING_LEN 8192

/* The size of the server's internal read-write buffers */
#define IOBUFSIZE 8192

/*
 * Special Apache error codes. These are basically used
 *  in http_main.c so we can keep track of various errors.
 *
 *   APEXIT_OK:
 *     A normal exit
 *   APEXIT_INIT:
 *     A fatal error arising during the server's init sequence
 *   APEXIT_CHILDINIT:
 *     The child died during it's init sequence
 *   APEXIT_CHILDFATAL:
 *     A fatal error, resulting in the whole server aborting.
 *     If a child exits with this error, the parent process
 *     considers this a server-wide fatal error and aborts.
 *                 
 */
#define APEXIT_OK		0x0
#define APEXIT_INIT		0x2
#define APEXIT_CHILDINIT	0x3
#define APEXIT_CHILDFATAL	0xf

/**
 * Get the server version string
 * @return The server version string
 * @deffunc const char *ap_get_server_version(void)
 */
AP_DECLARE(const char *) ap_get_server_version(void);

/**
 * Add a component to the version string
 * @param pconf The pool to allocate the component out of
 * @param component The string to add
 * @deffunc void ap_add_version_component(apr_pool_t *pconf, const char *component)
 */
AP_DECLARE(void) ap_add_version_component(apr_pool_t *pconf, const char *component);

/**
 * Get the date a time that the server was built
 * @return The server build time string
 */
AP_DECLARE(const char *) ap_get_server_built(void);

/* Numeric release version identifier: MMNNFFRBB: major minor fix final beta
 * Always increases along the same track as the source branch.
 * For example, Apache 1.4.2 would be '10402100', 2.5b7 would be '20500007'.
 */
#define APACHE_RELEASE 20000007

#define DECLINED -1		/* Module declines to handle */
#define DONE -2			/* Module has served the response completely 
				 *  - it's safe to die() with no more output
				 */
#define OK 0			/* Module has handled this stage. */


/* ----------------------- HTTP Status Codes  ------------------------- */

/* The size of the static array in http_protocol.c for storing
 * all of the potential response status-lines (a sparse table).
 * A future version should dynamically generate the apr_table_t at startup.
 */
#define RESPONSE_CODES 55

#define HTTP_CONTINUE                      100
#define HTTP_SWITCHING_PROTOCOLS           101
#define HTTP_PROCESSING                    102
#define HTTP_OK                            200
#define HTTP_CREATED                       201
#define HTTP_ACCEPTED                      202
#define HTTP_NON_AUTHORITATIVE             203
#define HTTP_NO_CONTENT                    204
#define HTTP_RESET_CONTENT                 205
#define HTTP_PARTIAL_CONTENT               206
#define HTTP_MULTI_STATUS                  207
#define HTTP_MULTIPLE_CHOICES              300
#define HTTP_MOVED_PERMANENTLY             301
#define HTTP_MOVED_TEMPORARILY             302
#define HTTP_SEE_OTHER                     303
#define HTTP_NOT_MODIFIED                  304
#define HTTP_USE_PROXY                     305
#define HTTP_TEMPORARY_REDIRECT            307
#define HTTP_BAD_REQUEST                   400
#define HTTP_UNAUTHORIZED                  401
#define HTTP_PAYMENT_REQUIRED              402
#define HTTP_FORBIDDEN                     403
#define HTTP_NOT_FOUND                     404
#define HTTP_METHOD_NOT_ALLOWED            405
#define HTTP_NOT_ACCEPTABLE                406
#define HTTP_PROXY_AUTHENTICATION_REQUIRED 407
#define HTTP_REQUEST_TIME_OUT              408
#define HTTP_CONFLICT                      409
#define HTTP_GONE                          410
#define HTTP_LENGTH_REQUIRED               411
#define HTTP_PRECONDITION_FAILED           412
#define HTTP_REQUEST_ENTITY_TOO_LARGE      413
#define HTTP_REQUEST_URI_TOO_LARGE         414
#define HTTP_UNSUPPORTED_MEDIA_TYPE        415
#define HTTP_RANGE_NOT_SATISFIABLE         416
#define HTTP_EXPECTATION_FAILED            417
#define HTTP_UNPROCESSABLE_ENTITY          422
#define HTTP_LOCKED                        423
#define HTTP_FAILED_DEPENDENCY             424
#define HTTP_INTERNAL_SERVER_ERROR         500
#define HTTP_NOT_IMPLEMENTED               501
#define HTTP_BAD_GATEWAY                   502
#define HTTP_SERVICE_UNAVAILABLE           503
#define HTTP_GATEWAY_TIME_OUT              504
#define HTTP_VERSION_NOT_SUPPORTED         505
#define HTTP_VARIANT_ALSO_VARIES           506
#define HTTP_INSUFFICIENT_STORAGE          507
#define HTTP_NOT_EXTENDED                  510

#define ap_is_HTTP_INFO(x)         (((x) >= 100)&&((x) < 200))
#define ap_is_HTTP_SUCCESS(x)      (((x) >= 200)&&((x) < 300))
#define ap_is_HTTP_REDIRECT(x)     (((x) >= 300)&&((x) < 400))
#define ap_is_HTTP_ERROR(x)        (((x) >= 400)&&((x) < 600))
#define ap_is_HTTP_CLIENT_ERROR(x) (((x) >= 400)&&((x) < 500))
#define ap_is_HTTP_SERVER_ERROR(x) (((x) >= 500)&&((x) < 600))

#define ap_status_drops_connection(x) \
                                   (((x) == HTTP_BAD_REQUEST)           || \
                                    ((x) == HTTP_REQUEST_TIME_OUT)      || \
                                    ((x) == HTTP_LENGTH_REQUIRED)       || \
                                    ((x) == HTTP_REQUEST_ENTITY_TOO_LARGE) || \
                                    ((x) == HTTP_REQUEST_URI_TOO_LARGE) || \
                                    ((x) == HTTP_INTERNAL_SERVER_ERROR) || \
                                    ((x) == HTTP_SERVICE_UNAVAILABLE) || \
				    ((x) == HTTP_NOT_IMPLEMENTED))

/* Methods recognized (but not necessarily handled) by the server.
 * These constants are used in bit shifting masks of size int, so it is
 * unsafe to have more methods than bits in an int.  HEAD == M_GET.
 * This list must be tracked by the list in http_protocol.c in routine
 * ap_method_name_of().
 */
#define M_GET        0
#define M_PUT        1
#define M_POST       2
#define M_DELETE     3
#define M_CONNECT    4
#define M_OPTIONS    5
#define M_TRACE      6
#define M_PATCH      7
#define M_PROPFIND   8
#define M_PROPPATCH  9
#define M_MKCOL     10
#define M_COPY      11
#define M_MOVE      12
#define M_LOCK      13
#define M_UNLOCK    14
#define M_INVALID   15

#define METHODS     16

typedef struct ap_method_list_t ap_method_list_t;
/**
 * Structure for handling HTTP methods.  Methods known to the server are
 * accessed via a bitmask shortcut; extension methods are handled by
 * an array.
 */
struct ap_method_list_t {
    /* The bitmask used for known methods */
    int method_mask;
    /* The array used for extension methods */
    apr_array_header_t *method_list;
};

#define CGI_MAGIC_TYPE "application/x-httpd-cgi"
#define INCLUDES_MAGIC_TYPE "text/x-server-parsed-html"
#define INCLUDES_MAGIC_TYPE3 "text/x-server-parsed-html3"
#define DIR_MAGIC_TYPE "httpd/unix-directory"

/* Just in case your linefeed isn't the one the other end is expecting. */
#ifndef CHARSET_EBCDIC
#define LF 10
#define CR 13
#define CRLF "\015\012"
#else /* CHARSET_EBCDIC */
/* For platforms using the EBCDIC charset, the transition ASCII->EBCDIC is done
 * in the buff package (bread/bputs/bwrite).  Everywhere else, we use
 * "native EBCDIC" CR and NL characters. These are therefore
 * defined as
 * '\r' and '\n'.
 */
#define CR '\r'
#define LF '\n'
#define CRLF "\r\n"
#endif /* CHARSET_EBCDIC */                                   

/* Possible values for request_rec.read_body (set by handling module):
 *    REQUEST_NO_BODY          Send 413 error if message has any body
 *    REQUEST_CHUNKED_ERROR    Send 411 error if body without Content-Length
 *    REQUEST_CHUNKED_DECHUNK  If chunked, remove the chunks for me.
 */
#define REQUEST_NO_BODY          0
#define REQUEST_CHUNKED_ERROR    1
#define REQUEST_CHUNKED_DECHUNK  2

/* Things which may vary per file-lookup WITHIN a request ---
 * e.g., state of MIME config.  Basically, the name of an object, info
 * about the object, and any other info we may ahve which may need to
 * change as we go poking around looking for it (e.g., overridden by
 * .htaccess files).
 *
 * Note how the default state of almost all these things is properly
 * zero, so that allocating it with pcalloc does the right thing without
 * a whole lot of hairy initialization... so long as we are willing to
 * make the (fairly) portable assumption that the bit pattern of a NULL
 * pointer is, in fact, zero.
 */

/**
 * This represents the result of calling htaccess; these are cached for
 * each request.
 */
struct htaccess_result {
    /** the directory to which this applies */
    const char *dir;
    /** the overrides allowed for the .htaccess file */
    int override;
    /** the configuration directives */
    void *htaccess;
    /** the next one, or NULL if no more; N.B. never change this */
    const struct htaccess_result *next;
};

/* The following four types define a hierarchy of activities, so that
 * given a request_rec r you can write r->connection->server->process
 * to get to the process_rec.  While this reduces substantially the
 * number of arguments that various hooks require beware that in
 * threaded versions of the server you must consider multiplexing
 * issues.  */

typedef struct process_rec process_rec;
typedef struct server_rec server_rec;
typedef struct conn_rec conn_rec;
typedef struct request_rec request_rec;

#include "util_uri.h"

/** A structure that represents one process */
struct process_rec {
    /** Global pool. Please try to cleared on _all_ exits */
    apr_pool_t *pool;
    /** aka configuration pool, cleared on restarts */
    apr_pool_t *pconf;
    /** How many command line arguments were pass to the program */
    int argc;
    /** The command line arguments */
    char *const *argv;
    /** The program name used to execute the program */
    const char *short_name;
};

/** A structure that represents the current request */
struct request_rec {
    /** The pool associated with the request */
    apr_pool_t *pool;
    /** The connection over which this connection has been read */
    conn_rec *connection;
    /** The virtual host this request is for */
    server_rec *server;

    /** If we wind up getting redirected, pointer to the request we 
     *  redirected to.  */
    request_rec *next;
    /** If this is an internal redirect, pointer to where we redirected 
     *  *from*.  */
    request_rec *prev;

    /** If this is a sub_request (see request.h) pointer back to the 
     *  main request.  */
    request_rec *main;

    /* Info about the request itself... we begin with stuff that only
     * protocol.c should ever touch...
     */
    /** First line of request, so we can log it */
    char *the_request;
    /** HTTP/0.9, "simple" request */
    int assbackwards;
    /** A proxy request (calculated during post_read_request/translate_name) */
    int proxyreq;
    /** HEAD request, as opposed to GET */
    int header_only;
    /** Protocol, as given to us, or HTTP/0.9 */
    char *protocol;
    /** Number version of protocol; 1.1 = 1001 */
    int proto_num;
    /** Host, as set by full URI or Host: */
    const char *hostname;

    /** When the request started */
    apr_time_t request_time;

    /** Status line, if set by script */
    const char *status_line;
    /** In any case */
    int status;

    /* Request method, two ways; also, protocol, etc..  Outside of protocol.c,
     * look, but don't touch.
     */

    /** GET, HEAD, POST, etc. */
    const char *method;
    /** M_GET, M_POST, etc. */
    int method_number;

    /** <PRE>
     *  allowed is a bitvector of the allowed methods.
     *
     *  A handler must ensure that the request method is one that
     *  it is capable of handling.  Generally modules should DECLINE
     *  any request methods they do not handle.  Prior to aborting the
     *  handler like this the handler should set r->allowed to the list
     *  of methods that it is willing to handle.  This bitvector is used
     *  to construct the "Allow:" header required for OPTIONS requests,
     *  and HTTP_METHOD_NOT_ALLOWED and HTTP_NOT_IMPLEMENTED status codes.
     *
     *  Since the default_handler deals with OPTIONS, all modules can
     *  usually decline to deal with OPTIONS.  TRACE is always allowed,
     *  modules don't need to set it explicitly.
     *
     *  Since the default_handler will always handle a GET, a
     *  module which does *not* implement GET should probably return
     *  HTTP_METHOD_NOT_ALLOWED.  Unfortunately this means that a Script GET
     *  handler can't be installed by mod_actions. </PRE>
     */
    /** Allowed methods - for 405, OPTIONS, etc */
    int allowed;
    /** Array of extension methods */
    apr_array_header_t *allowed_xmethods; 
    /** List of allowed methods */
    ap_method_list_t *allowed_methods; 

    /** byte count in stream is for body */
    int sent_bodyct;
    /** body byte count, for easy access */
    long bytes_sent;
    /** Time the resource was last modified */
    apr_time_t mtime;

    /* HTTP/1.1 connection-level features */

    /** sending chunked transfer-coding */
    int chunked;
    /** multipart/byteranges boundary */
    const char *boundary;
    /** The Range: header */
    const char *range;
    /** The "real" content length */
    apr_off_t clength;

    /** bytes left to read */
    long remaining;
    /** bytes that have been read */
    long read_length;
    /** how the request body should be read */
    int read_body;
    /** reading chunked transfer-coding */
    int read_chunked;
    /** is client waiting for a 100 response? */
    unsigned expecting_100;

    /* MIME header environments, in and out.  Also, an array containing
     * environment variables to be passed to subprocesses, so people can
     * write modules to add to that environment.
     *
     * The difference between headers_out and err_headers_out is that the
     * latter are printed even on error, and persist across internal redirects
     * (so the headers printed for ErrorDocument handlers will have them).
     *
     * The 'notes' apr_table_t is for notes from one module to another, with no
     * other set purpose in mind...
     */

    /** MIME header environment from the request */
    apr_table_t *headers_in;
    /** MIME header environment for the response */
    apr_table_t *headers_out;
    /** MIME header environment for the response, printed even on errors and
     * persist across internal redirects */
    apr_table_t *err_headers_out;
    /** Array of environment variables to be used for sub processes */
    apr_table_t *subprocess_env;
    /** Notes from one module to another */
    apr_table_t *notes;

    /* content_type, handler, content_encoding, content_language, and all
     * content_languages MUST be lowercased strings.  They may be pointers
     * to static strings; they should not be modified in place.
     */
    /** The content-type for the current request */
    const char *content_type;	/* Break these out --- we dispatch on 'em */
    /** The handler string that we use to call a handler function */
    const char *handler;	/* What we *really* dispatch on           */

    /** How to encode the data */
    const char *content_encoding;
    /** for back-compat. only -- do not use */
    const char *content_language;
    /** array of (char*) representing the content languages */
    apr_array_header_t *content_languages;

    /** variant list validator (if negotiated) */
    char *vlist_validator;
    
    /** If an authentication check was made, this gets set to the user name. */
    char *user;	
    /** If an authentication check was made, this gets set to the auth type. */
    char *ap_auth_type;

    /** This response is non-cache-able */
    int no_cache;
    /** There is no local copy of this response */
    int no_local_copy;

    /* What object is being requested (either directly, or via include
     * or content-negotiation mapping).
     */

    /** the uri without any parsing performed */
    char *unparsed_uri;	
    /** the path portion of the URI */
    char *uri;
    /** The filename on disk that this response corresponds to */
    char *filename;
    /** The path_info for this request if there is any. */
    char *path_info;
    /** QUERY_ARGS, if any */
    char *args;	
    /** ST_MODE set to zero if no such file */
    apr_finfo_t finfo;
    /** components of uri, dismantled */
    uri_components parsed_uri;

    /* Various other config info which may change with .htaccess files
     * These are config vectors, with one void* pointer for each module
     * (the thing pointed to being the module's business).
     */

    /** Options set in config files, etc. */
    void *per_dir_config;
    /** Notes on *this* request */
    void *request_config;

/**
 * a linked list of the configuration directives in the .htaccess files
 * accessed by this request.
 * N.B. always add to the head of the list, _never_ to the end.
 * that way, a sub request's list can (temporarily) point to a parent's list
 * @defvar const htaccess_result *htaccess
 */
    const struct htaccess_result *htaccess;

    /** A list of output filters to be used for this request 
     *  @defvar ap_filter_t *output_filters */
    struct ap_filter_t *output_filters;
    /** A list of input filters to be used for this request 
     *  @defvar ap_filter_t *input_filters */
    struct ap_filter_t *input_filters;
    /** A flag to determine if the eos bucket has been sent yet
     *  @defvar int eos_sent */
    int eos_sent;

/* Things placed at the end of the record to avoid breaking binary
 * compatibility.  It would be nice to remember to reorder the entire
 * record to improve 64bit alignment the next time we need to break
 * binary compatibility for some other reason.
 */
};


/** Structure to store things which are per connection */
struct conn_rec {
    /** Pool associated with this connection */
    apr_pool_t *pool;
    /** Physical vhost this conn come in on */
    server_rec *base_server;
    /** used by http_vhost.c */
    void *vhost_lookup_data;

    /* Information about the connection itself */

    /** Connection to the client */
    apr_socket_t *client_socket;

    /* Who is the client? */

    /** local address */
    struct sockaddr_in local_addr;
    /** remote address */
    struct sockaddr_in remote_addr;
    /** Client's IP address */
    char *remote_ip;
    /** Client's DNS name, if known.  NULL if DNS hasn't been checked,
     *  "" if it has and no address was found.  N.B. Only access this though
     * get_remote_host() */
    char *remote_host;
    /** Only ever set if doing rfc1413 lookups.  N.B. Only access this through
     *  get_remote_logname() */
    char *remote_logname;

    /** Are we still talking? */
    unsigned aborted:1;
    /** Are we using HTTP Keep-Alive?  -1 fatal error, 0 undecided, 1 yes */
    signed int keepalive:2;
    /** Did we use HTTP Keep-Alive? */
    unsigned keptalive:1;
    /** have we done double-reverse DNS? -1 yes/failure, 0 not yet, 
     *  1 yes/success */
    signed int double_reverse:2;

    /** How many times have we used it? */
    int keepalives;
    /** server IP address */
    char *local_ip;
    /** used for ap_get_server_name when UseCanonicalName is set to DNS
     *  (ignores setting of HostnameLookups) */
    char *local_host;

    /** ID of this connection; unique at any point in time */
    long id; 
    /** Notes on *this* connection */
    void *conn_config;
    /** send note from one module to another, must remain valid for all
     *  requests on this conn */
    apr_table_t *notes;
    /** A list of input filters to be used for this connection
     *  @defvar ap_filter_t *input_filters */
    struct ap_filter_t *input_filters;
    /** A list of output filters to be used for this connection
     *  @defvar ap_filter_t *filters */
    struct ap_filter_t *output_filters;
    /** The length of the current request body
     *  @defvar long remain */
    long remain;
};

/* Per-vhost config... */

/* The address 255.255.255.255, when used as a virtualhost address,
 * will become the "default" server when the ip doesn't match other vhosts.
 */
#define DEFAULT_VHOST_ADDR 0xfffffffful

typedef struct server_addr_rec server_addr_rec;

/** A structure to be used for Per-vhost config */
struct server_addr_rec {
    /** The next server in the list */
    server_addr_rec *next;
    /** The bound address, for this server */
    apr_in_addr_t host_addr;
    /** The bound port, for this server */
    apr_port_t host_port;
    /** The name given in <VirtualHost> */
    char *virthost;
};

/** A structure to store information for each virtual server */
struct server_rec {
    /** The process this server is running in */
    process_rec *process;
    /** The next server in the list */
    server_rec *next;

    /** The name of the server */
    const char *defn_name;
    /** The line of the config file that the server was defined on */
    unsigned defn_line_number;

    /* Contact information */

    /** The admin's contact information */
    char *server_admin;
    /** The server hostname */
    char *server_hostname;
    /** for redirects, etc. */
    apr_port_t port;

    /* Log files --- note that transfer log is now in the modules... */

    /** The name of the error log */
    char *error_fname;
    /** A file descriptor that references the error log */
    apr_file_t *error_log;
    /** The log level for this server */
    int loglevel;

    /* Module-specific configuration for server, and defaults... */

    /** true if this is the virtual server */
    int is_virtual;
    /** Config vector containing pointers to modules' per-server config 
     *  structures. */
    void *module_config; 
    /** MIME type info, etc., before we start checking per-directory info */
    void *lookup_defaults;

    /* Transaction handling */

    /** I haven't got a clue */
    server_addr_rec *addrs;
    /** Timeout, in seconds, before we give up */
    int timeout;
    /** Seconds we'll wait for another request */
    int keep_alive_timeout;
    /** Maximum requests per connection */
    int keep_alive_max;
    /** Use persistent connections? */
    int keep_alive;

    /** Pathname for ServerPath */
    const char *path;
    /** Length of path */
    int pathlen;

    /** Normal names for ServerAlias servers */
    apr_array_header_t *names;
    /** Wildcarded names for ServerAlias servers */
    apr_array_header_t *wild_names;

    /** limit on size of the HTTP request line    */
    int limit_req_line;
    /** limit on size of any request header field */
    int limit_req_fieldsize;
    /** limit on number of request header fields  */
    int limit_req_fields; 
};

/* stuff marked AP_DECLARE is part of the API, and intended for use
 * by modules
 */
#ifndef AP_DECLARE
#define AP_DECLARE(type)    type
#endif

/* Stuff marked AP_DECLARE_NONSTD is part of the API, and intended for
 * use by modules.  The difference between AP_DECLARE and
 * AP_DECLARE_NONSTD is that the latter is required for any functions
 * which use varargs or are used via indirect function call.  This
 * is to accomodate the two calling conventions in windows dlls.
 */
#ifndef AP_DECLARE_NONSTD
#define AP_DECLARE_NONSTD(type)    type
#endif

#ifndef AP_MODULE_DECLARE_DATA
#define AP_MODULE_DECLARE_DATA
#endif
#ifndef AP_DECLARE_DATA
#define AP_DECLARE_DATA
#endif

/* modules should not used functions marked AP_CORE_DECLARE
 * or AP_CORE_DECLARE_NONSTD */
#ifndef AP_CORE_DECLARE
#define AP_CORE_DECLARE	AP_DECLARE
#endif
#ifndef AP_CORE_DECLARE_NONSTD
#define AP_CORE_DECLARE_NONSTD	AP_DECLARE_NONSTD
#endif

/* On Mac OS X Server, symbols that conflict with loaded dylibs
 * (eg. System framework) need to be declared as private symbols with
 * __private_extern__.
 * For other systems, make that a no-op.
 */
#ifndef ap_private_extern
#if (defined(MAC_OS) || defined(MAC_OS_X_SERVER)) && defined(__DYNAMIC__)
#define ap_private_extern __private_extern__
#else
#define ap_private_extern
#endif
#endif

/**
 * Examine a field value (such as a media-/content-type) string and return
 * it sans any parameters; e.g., strip off any ';charset=foo' and the like.
 * @param p Pool to allocate memory out of
 * @param intype The field to examine
 * @return the field minus any parameters
 * @deffunc char *ap_field_noparam(apr_pool_t *p, const char *intype);
 */
AP_DECLARE(char *) ap_field_noparam(apr_pool_t *p, const char *intype);

/**
 * Convert a time from an integer into a string in a specified format
 * @param p The pool to allocate memory out of
 * @param t The time to convert
 * @param fmt The format to use for the conversion
 * @param gmt Convert the time for GMT?
 * @return The string that represents the specified time
 * @deffunc char *ap_ht_time(apr_pool_t *p, apr_time_t t, const char *fmt, int gmt)
 */
AP_DECLARE(char *) ap_ht_time(apr_pool_t *p, apr_time_t t, const char *fmt, int gmt);

/* String handling. The *_nc variants allow you to use non-const char **s as
   arguments (unfortunately C won't automatically convert a char ** to a const
   char **) */

/**
 * Get the characters until the first occurance of a specified character
 * @param p The pool to allocate memory out of
 * @param line The string to get the characters from
 * @param stop The character to stop at
 * @return A copy of the characters up to the first stop character
 * @deffunc char *ap_getword(apr_pool_t *p, const char **line, char stop);
 */
AP_DECLARE(char *) ap_getword(apr_pool_t *p, const char **line, char stop);
/**
 * Get the characters until the first occurance of a specified character
 * @param p The pool to allocate memory out of
 * @param line The string to get the characters from
 * @param stop The character to stop at
 * @return A copy of the characters up to the first stop character
 * @tip This is the same as ap_getword, except it doesn't use const char **.
 * @deffunc char *ap_getword_nc(apr_pool_t *p, char **line, char stop);
 */
AP_DECLARE(char *) ap_getword_nc(apr_pool_t *p, char **line, char stop);

/**
 * Get the first word from a given string.  A word is defined as all characters
 * up to the first whitespace.
 * @param p The pool to allocate memory from
 * @param line The string to traverse
 * @retrn The first word in the line
 * @deffunc char *ap_getword_white(apr_pool_t *p, const char **line)
 */
AP_DECLARE(char *) ap_getword_white(apr_pool_t *p, const char **line);
/**
 * Get the first word from a given string.  A word is defined as all characters
 * up to the first whitespace.
 * @param p The pool to allocate memory from
 * @param line The string to traverse
 * @retrn The first word in the line
 * @tip The same as ap_getword_white, except it doesn't use const char **.
 * @deffunc char *ap_getword_white_nc(apr_pool_t *p, const char **line)
 */
AP_DECLARE(char *) ap_getword_white_nc(apr_pool_t *p, char **line);

/**
 * Get all characters from the first occurance of stop to the first '\0'
 * @param p The pool to allocate memory out of
 * @param line The line to traverse
 * @param stop The character to start at
 * @return A copy of all caracters after the first occurance of the specified
 *         character
 * @deffunc char *ap_getword_nulls(apr_pool_t *p, const char **line, char stop)
 */
AP_DECLARE(char *) ap_getword_nulls(apr_pool_t *p, const char **line, char stop);
/**
 * Get all characters from the first occurance of stop to the first '\0'
 * @param p The pool to allocate memory out of
 * @param line The line to traverse
 * @param stop The character to start at
 * @return A copy of all caracters after the first occurance of the specified
 *         character
 * @tip The same as ap_getword_nulls, except it doesn't use const char **.
 * @deffunc char *ap_getword_nulls_nc(apr_pool_t *p, char **line, char stop)
 */
AP_DECLARE(char *) ap_getword_nulls_nc(apr_pool_t *p, char **line, char stop);

/**
 * Get the second word in the string paying attention to quoting
 * @param p The pool to allocate out of
 * @param line The line to traverse
 * @return A copy of the string
 * @deffunc char *ap_getword_conf(apr_pool_t *p, const char **line)
 */
AP_DECLARE(char *) ap_getword_conf(apr_pool_t *p, const char **line);
/**
 * Get the second word in the string paying attention to quoting
 * @param p The pool to allocate out of
 * @param line The line to traverse
 * @return A copy of the string
 * @tip The same as ap_getword_conf, except it doesn't use const char **.
 * @deffunc char *ap_getword_conf_nc(apr_pool_t *p, char **line)
 */
AP_DECLARE(char *) ap_getword_conf_nc(apr_pool_t *p, char **line);

/**
 * Check a string for any ${ENV} environment variable construct and replace 
 * each them by the value of that environment variable, if it exists. If the 
 * environment value does not exist, leave the ${ENV} construct alone; it 
 * means something else.
 * @param p The pool to allocate out of
 * @param word The string to check
 * @return The string with the replaced environment variables
 * @deffunc const char *ap_resolve_env(apr_pool_t *p, const char *word)
 */
AP_DECLARE(const char *) ap_resolve_env(apr_pool_t *p, const char * word); 

/**
 * Size an HTTP header field list item, as separated by a comma.
 * @param field The field to size
 * @param len The length of the field
 * @return The return value is a pointer to the beginning of the non-empty 
 * list item within the original string (or NULL if there is none) and the 
 * address of field is shifted to the next non-comma, non-whitespace 
 * character.  len is the length of the item excluding any beginning whitespace.
 * @deffunc const char *ap_size_list_item(const char **field, int *len)
 */
AP_DECLARE(const char *) ap_size_list_item(const char **field, int *len);

/**
 * Retrieve an HTTP header field list item, as separated by a comma,
 * while stripping insignificant whitespace and lowercasing anything not in
 * a quoted string or comment.  
 * @param p The pool to allocate out of
 * @param field The field to retrieve
 * @return The return value is a new string containing the converted list 
 *         item (or NULL if none) and the address pointed to by field is 
 *         shifted to the next non-comma, non-whitespace.
 * @deffunc char *ap_get_list_item(apr_pool_t *p, const char **field)
 */
AP_DECLARE(char *) ap_get_list_item(apr_pool_t *p, const char **field);

/**
 * Find an item in canonical form (lowercase, no extra spaces) within
 * an HTTP field value list.  
 * @param p The pool to allocate out of
 * @param line The field value list to search
 * @param tok The token to search for
 * @return 1 if found, 0 if not found.
 * @deffunc int ap_find_list_item(apr_pool_t *p, const char *line, const char *tok)
 */
AP_DECLARE(int) ap_find_list_item(apr_pool_t *p, const char *line, const char *tok);

/**
 * Retrieve a token, spacing over it and returning a pointer to
 * the first non-white byte afterwards.  Note that these tokens
 * are delimited by semis and commas; and can also be delimited
 * by whitespace at the caller's option.
 * @param p The pool to allocate out of
 * @param accept_line The line to retrieve the token from
 * @param accept_white Is it delimited by whitespace
 * @return the first non-white byte after the token
 * @deffunc char *ap_get_token(apr_pool_t *p, const char **accept_line, int accept_white)
 */
AP_DECLARE(char *) ap_get_token(apr_pool_t *p, const char **accept_line, int accept_white);

/**
 * find http tokens, see the definition of token from RFC2068 
 * @param p The pool to allocate out of
 * @param line The line to find the token
 * @param tok The token to find
 * @return 1 if the token is found, 0 otherwise
 * @deffunc int ap_find_token(apr_pool_t *p, const char *line, const char *tok)
 */
AP_DECLARE(int) ap_find_token(apr_pool_t *p, const char *line, const char *tok);

/**
 * find http tokens from the end of the line
 * @param p The pool to allocate out of
 * @param line The line to find the token
 * @param tok The token to find
 * @return 1 if the token is found, 0 otherwise
 * @deffunc int ap_find_last_token(apr_pool_t *p, const char *line, const char *tok)
 */
AP_DECLARE(int) ap_find_last_token(apr_pool_t *p, const char *line, const char *tok);

/**
 * Check for an Absolute URI syntax
 * @param u The string to check
 * @return 1 if URI, 0 otherwise
 * @deffunc int ap_is_url(const char *u)
 */
AP_DECLARE(int) ap_is_url(const char *u);

/**
 * Unescape a URL
 * @param url The url to unescapte
 * @return 0 on success, non-zero otherwise
 * @deffunc int ap_unescape_url(char *url)
 */
AP_DECLARE(int) ap_unescape_url(char *url);
/**
 * Remove all double slashes from a string
 * @param name The string to parse
 * @deffunc void ap_no2slash(char *name)
 */
AP_DECLARE(void) ap_no2slash(char *name);

/**
 * Remove all ./ and ../ substrings from a file name
 * @param name the file name to parse
 * @deffunc void ap_getparents(char *name)
 */
AP_DECLARE(void) ap_getparents(char *name);

/**
 * Escape a path segment, as defined in RFC 1808
 * @param p The pool to allocate out of
 * @param s The path to convert
 * @return The converted URL
 * @deffunc char *ap_escape_path_segment(apr_pool_t *p, const char *s)
 */
AP_DECLARE(char *) ap_escape_path_segment(apr_pool_t *p, const char *s);
/**
 * convert an OS path to a URL in an OS dependant way.
 * @param p The pool to allocate out of
 * @param path The path to convert
 * @param partial if set, assume that the path will be appended to something
 *        with a '/' in it (and thus does not prefix "./")
 * @return The converted URL
 * @deffunc char *ap_os_escape_path(apr_pool_t *p, const char *path, int partial)
 */
AP_DECLARE(char *) ap_os_escape_path(apr_pool_t *p, const char *path, int partial);
#define ap_escape_uri(ppool,path) ap_os_escape_path(ppool,path,1)

/**
 * Escape an html string
 * @param p The pool to allocate out of
 * @param s The html to escape
 * @return The escaped string
 * @deffunc char *ap_escape_html(apr_pool_t *p, const char *s)
 */
AP_DECLARE(char *) ap_escape_html(apr_pool_t *p, const char *s);

/**
 * Construct a full hostname
 * @param p The pool to allocate out of
 * @param hostname The hostname of the server
 * @param port The port the server is running on
 * @param r The current request
 * @return The server's hostname
 * @deffunc char *ap_construct_server(apr_pool_t *p, const char *hostname, apr_port_t port, const request_rec *r)
 */
AP_DECLARE(char *) ap_construct_server(apr_pool_t *p, const char *hostname,
				    apr_port_t port, const request_rec *r);
/**
 * Escape a shell command
 * @param p The pool to allocate out of
 * @param s The command to escape
 * @return The escaped hostname
 * @deffunc char *ap_escape_shell_cmd(apr_pool_t *p, const char *s)
 */
AP_DECLARE(char *) ap_escape_shell_cmd(apr_pool_t *p, const char *s);

/**
 * Count the number of directories in a path
 * @param The path to count
 * @return The number of directories
 * @deffunc int ap_count_dirs(const char *path)
 */
AP_DECLARE(int) ap_count_dirs(const char *path);
/**
 * Copy at most n leading directories of s into d d should be at least as 
 * large as s plus 1 extra byte
 * @param d The location to copy to
 * @param s The location to copy from
 * @param n The number of directories to copy
 * @return value is the ever useful pointer to the trailing \0 of d
 * @deffunc char *ap_make_dirstr_prefix(char *d, const char *s, int n)
 * @tip on platforms with drive letters, n = 0 returns the "/" root, 
 * whereas n = 1 returns the "d:/" root.  On all other platforms, n = 0
 * returns the empty string.
 */
AP_DECLARE(char *) ap_make_dirstr_prefix(char *d, const char *s, int n);
/**
 * return the parent directory name including trailing / of the file s
 * @param p The pool to allocate out of
 * @param s The file to get the parent of
 * @return A copy of the file's parent directory
 * @deffunc char *ap_make_dirstr_parent(apr_pool_t *p, const char *s)
 */
AP_DECLARE(char *) ap_make_dirstr_parent(apr_pool_t *p, const char *s);

/**
 * Given a directory and filename, create a single path out of them.  This
 * function is smart enough to ensure that there is a sinlge '/' between the
 * directory and file names
 * @param a The pool to allocate out of
 * @param dir The directory name
 * @param f The filename
 * @return A copy of the full path
 * @deffunc char *ap_make_full_path(apr_pool_t *a, const char *dir, const char *f)
 */
AP_DECLARE(char *) ap_make_full_path(apr_pool_t *a, const char *dir, const char *f);

/**
 * Does the provided string contain wildcard characters?  This is useful
 * for determining if the string should be passed to strcmp_match or to strcmp.
 * The only wildcard characters recognized are '?' and '*'
 * @param str The string to check
 * @return 1 if the string has wildcards, 0 otherwise
 * @deffunc int ap_is_matchexp(const char *str)
 */
AP_DECLARE(int) ap_is_matchexp(const char *str);

/**
 * Determine if a string matches a patterm containing the wildcards '?' or '*'
 * @param str The string to check
 * @param exp The pattern to match against
 * @return 1 if the two strings match, 0 otherwise
 * @deffunc int ap_strcmp_match(const char *str, const char *exp)
 */
AP_DECLARE(int) ap_strcmp_match(const char *str, const char *exp);
/**
 * Determine if a string matches a patterm containing the wildcards '?' or '*',
 * ignoring case
 * @param str The string to check
 * @param exp The pattern to match against
 * @return 1 if the two strings match, 0 otherwise
 * @deffunc int ap_strcasecmp_match(const char *str, const char *exp)
 */
AP_DECLARE(int) ap_strcasecmp_match(const char *str, const char *exp);

/**
 * Find the first occurrence of the substring s2 in s1, regardless of case
 * @param s1 The string to search
 * @param s2 The substring to search for
 * @return A pointer to the beginning of the substring
 * @deffunc char *ap_strcasestr(const char *s1, const char *s2)
 */
AP_DECLARE(char *) ap_strcasestr(const char *s1, const char *s2);

/**
 * Return a pointer to the location inside of bigstring immediately after prefix
 * @param bigstring The input string
 * @param prefix The prefix to strip away
 * @return A pointer relative to bigstring after prefix
 * deffunc const char *ap_stripprefix(const char *bigstring, const char *prefix);
 */
AP_DECLARE(const char *) ap_stripprefix(const char *bigstring,
                                        const char *prefix);

/**
 * Decode a base64 encoded string into memory allocated out of a pool
 * @param p The pool to allocate out of
 * @param bufcoded The encoded string
 * @return The decoded string
 * @deffunc char *ap_pbase64decode(apr_pool_t *p, const char *bufcoded)
 */
AP_DECLARE(char *) ap_pbase64decode(apr_pool_t *p, const char *bufcoded);

/**
 * Encode a string into memory allocated out of a pool in base 64 format
 * @param p The pool to allocate out of
 * @param strin The plaintext string
 * @return The encoded string
 * @deffunc char *ap_pbase64encode(apr_pool_t *p, char *string)
 */
AP_DECLARE(char *) ap_pbase64encode(apr_pool_t *p, char *string); 

#include "pcreposix.h"

/**
 * Compile a regular expression to be used later
 * @param p The pool to allocate out of
 * @param pattern the regular expression to compile
 * @param cflags The bitwise or of one or more of the following:
 * <PRE>
 *       REG_EXTENDED - Use POSIX extended Regular Expressions
 *       REG_ICASE    - Ignore case
 *       REG_NOSUB    - Support for substring addressing of matches not required
 *       REG_NEWLINE  - Match-any-character operators don't match new-line
 * </PRE>
 * @return The compiled regular expression
 * @deffunc regex_t *ap_pregcomp(apr_pool_t *p, const char *pattern, int cflags)
 */
AP_DECLARE(regex_t *) ap_pregcomp(apr_pool_t *p, const char *pattern,
				   int cflags);
/**
 * Free the memory associated with a compiled regular expression
 * @param p The pool the regex was allocated out of
 * @param reg The regular expression to free
 * @deffunc void ap_pregfree(apr_pool_t *p, regex_t *reg)
 */
AP_DECLARE(void) ap_pregfree(apr_pool_t *p, regex_t *reg);

/**
 * Match a null-terminated string against a pre-compiled regex.
 * @param preg The pre-compiled regex
 * @param string The string to match
 * @param nmatch Provide information regarding the location of any matches
 * @param pmatch Provide information regarding the location of any matches
 * @param eflags Bitwise or of one or both of:
 * <PRE>
 *        REG_NOTBOL - match-beginning-of-line operator always fails to match
 *        REG_NOTEOL - match-end-of-line operator always fails to match
 * </PRE>
 * @return 0 for successful match, REG_NOMATCH otherwise
 * @deffunc int ap_regexec(regex_t *preg, const char *string, size_t nmatch, regmatch_t pmatch[], int eflags)
 */ 
AP_DECLARE(int)    ap_regexec(regex_t *preg, const char *string,
                              size_t nmatch, regmatch_t pmatch[], int eflags);

/**
 * Return the error code returned by regcomp or regexec into error messages
 * @param errocode the error code returned by regexec or regcomp
 * @param preg The precompiled regex
 * @param errbuf A buffer to store the error in
 * @param errbuf_size The size of the buffer
 * @deffunc size_t ap_regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
 */
AP_DECLARE(size_t) ap_regerror(int errcode, const regex_t *preg, 
                               char *errbuf, size_t errbuf_size);

/**
 * After performing a successful regex match, you may use this function to 
 * perform a series of string substitutions based on subexpressions that were
 * matched during the call to ap_regexec
 * @param p The pool to allocate out of
 * @param input An arbitrary string containing $1 through $9.  These are 
 *              replaced with the corresponding matched sub-expressions
 * @param source The string that was originally matched to the regex
 * @param nmatch the nmatch returned from ap_pregex
 * @param pmatch the pmatch array returned from ap_pregex
 * @deffunc char *ap_pregsub(apr_pool_t *p, const char *input, const char *source, size_t nmatch, regmatch_t pmatch[])
 */
AP_DECLARE(char *) ap_pregsub(apr_pool_t *p, const char *input, const char *source,
                              size_t nmatch, regmatch_t pmatch[]);

/**
 * we want to downcase the type/subtype for comparison purposes
 * but nothing else because ;parameter=foo values are case sensitive.
 * @param s The content-type to convert to lowercase
 * @deffunc void ap_content_type_tolower(char *s)
 */
AP_DECLARE(void) ap_content_type_tolower(char *s);
/**
 * convert a string to all lowercase
 * @param s The string to convert to lowercase 
 * @deffunc void ap_str_tolower(char *s) 
 */
AP_DECLARE(void) ap_str_tolower(char *s);

/**
 * Search a string from left to right for the first occurrence of a 
 * specific character
 * @param str The string to search
 * @param c The character to search for
 * @return The index of the first occurrence of c in str
 * @deffunc int ap_ind(const char *str, char c)
 */
AP_DECLARE(int) ap_ind(const char *str, char c);	/* Sigh... */

/**
 * Search a string from right to left for the first occurrence of a 
 * specific character
 * @param str The string to search
 * @param c The character to search for
 * @return The index of the first occurrence of c in str
 * @deffunc int ap_rind(const char *str, char c)
 */
AP_DECLARE(int) ap_rind(const char *str, char c);

/**
 * Given a string, replace any bare " with \" .
 * @param p The pool to allocate memory out of
 * @param instring The string to search for "
 * @return A copy of the string with escaped quotes 
 * @deffunc char * ap_escape_quotes(apr_pool_t *p, const char *instring) 
 */
AP_DECLARE(char *) ap_escape_quotes(apr_pool_t *p, const char *instring);

/* Misc system hackery */
/**
 * Convert a username to a numeric ID
 * @param name The name to convert
 * @return The user id corresponding to a name
 * @deffunc uid_t ap_uname2id(const char *name) 
 */
AP_DECLARE(uid_t) ap_uname2id(const char *name);
/**
 * Convert a group name to a numeric ID
 * @param name The name to convert
 * @return The group id corresponding to a name
 * @deffunc gid_t ap_gname2id(const char *name) 
 */
AP_DECLARE(gid_t) ap_gname2id(const char *name);
/**
 * Given the name of an object in the file system determine if it is a directory
 * @param name The name of the object to check
 * @return 1 if it is a directory, 0 otherwise
 * @deffunc int ap_is_rdirectory(const char *name)
 */
AP_DECLARE(int) ap_is_rdirectory(const char *name);
/**
 * Given the name of an object in the file system determine if it is a directory - this version is symlink aware
 * @param name The name of the object to check
 * @return 1 if it is a directory, 0 otherwise
 * @deffunc int ap_is_directory(const char *name)
 */
AP_DECLARE(int) ap_is_directory(const char *name);
/**
 * Given a pathname in file, extract the directory and chdir to that directory
 * @param file The file who's directory we wish to switch to
 * @deffunc void ap_chdir_file(const char *file)
 */
AP_DECLARE(void) ap_chdir_file(const char *file);
/**
 * Get the maximum number of daemons processes for this version of Apache
 * @return The maximum number of daemon processes
 * @deffunc int ap_get_max_daemons(void)
 */
AP_DECLARE(int) ap_get_max_daemons(void);

#ifdef _OSD_POSIX
extern const char *os_set_account(apr_pool_t *p, const char *account);
extern int os_init_job_environment(server_rec *s, const char *user_name, int one_process);
#endif /* _OSD_POSIX */

/**
 * determine the local host name for the current machine
 * @param p The pool to allocate out of
 * @return A copy of the local host name
 * @deffunc char *ap_get_local_host(apr_pool_t *p)
 */
char *ap_get_local_host(apr_pool_t *p);

/**
 * Parses a host of the form <address>[:port] :port is permitted if 'port' 
 * is not NULL
 * @param hostname The hostname to parse
 * @param port The port found in the hostname
 * @return The address of the server
 * @deffunc unsigned long ap_get_virthost_addr(char *hostname, apr_port_t *port)
 */
unsigned long ap_get_virthost_addr(char *hostname, apr_port_t *port);

/*
 * Redefine assert() to something more useful for an Apache...
 *
 * Use ap_assert() if the condition should always be checked.
 * Use AP_DEBUG_ASSERT() if the condition should only be checked when AP_DEBUG
 * is defined.
 */
/**
 * Log an assertion to the error log
 * @param szExp The assertion that failed
 * @param szFile The file the assertion is in
 * @param nLine The line the assertion is defined on
 * @deffunc void ap_log_assert(const char *szExp, const char *szFile, int nLine)
 */
AP_DECLARE(void) ap_log_assert(const char *szExp, const char *szFile, int nLine)
			    __attribute__((noreturn));
#define ap_assert(exp) ((exp) ? (void)0 : ap_log_assert(#exp,__FILE__,__LINE__))

#ifdef AP_DEBUG
#define AP_DEBUG_ASSERT(exp) ap_assert(exp)
#else
#define AP_DEBUG_ASSERT(exp) ((void)0)
#endif

/* A set of flags which indicate places where the server should raise(SIGSTOP).
 * This is useful for debugging, because you can then attach to that process
 * with gdb and continue.  This is important in cases where one_process
 * debugging isn't possible.
 */
#define SIGSTOP_DETACH			1
#define SIGSTOP_MAKE_CHILD		2
#define SIGSTOP_SPAWN_CHILD		4
#define SIGSTOP_PIPED_LOG_SPAWN		8
#define SIGSTOP_CGI_CHILD		16

#ifdef DEBUG_SIGSTOP
extern int raise_sigstop_flags;
#define RAISE_SIGSTOP(x)	do { \
	if (raise_sigstop_flags & SIGSTOP_##x) raise(SIGSTOP);\
    } while (0)
#else
#define RAISE_SIGSTOP(x)
#endif

AP_DECLARE(extern const char *) ap_psignature(const char *prefix, request_rec *r);

/* strtoul does not exist on sunos4. */
#ifdef strtoul
#undef strtoul
#endif
#define strtoul strtoul_is_not_a_portable_function_use_strtol_instead

  /* The C library has functions that allow const to be silently dropped ...
     these macros detect the drop in maintainer mode, but use the native
     methods far narmal builds
  */
#ifdef AP_DEBUG

#undef strchr
# define strchr(s, c)	ap_strchr(s,c)
#undef strrchr
# define strrchr(s, c)  ap_strrchr(s,c)
#undef strstr
# define strstr(s, c)  ap_strstr(s,c)

char *ap_strchr(char *s, int c);
const char *ap_strchr_c(const char *s, int c);
char *ap_strrchr(char *s, int c);
const char *ap_strrchr_c(const char *s, int c);
char *ap_strstr(char *s, char *c);
const char *ap_strstr_c(const char *s, const char *c);

#else

# define ap_strchr(s, c)	strchr(s, c)
# define ap_strchr_c(s, c)	strchr(s, c)
# define ap_strrchr(s, c)	strrchr(s, c)
# define ap_strrchr_c(s, c)	strrchr(s, c)
# define ap_strstr(s, c)	strstr(s, c)
# define ap_strstr_c(s, c)	strstr(s, c)

#endif

#ifdef __cplusplus
}
#endif

#endif	/* !APACHE_HTTPD_H */