mod_rewrite.h

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/* ====================================================================
 * Copyright (c) 1996-1998 The Apache Group.  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. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the Apache Group
 *    for use in the Apache HTTP server project (http://www.apache.org/)."
 *
 * 4. The names "Apache Server" and "Apache Group" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    [e-mail].
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the Apache Group
 *    for use in the Apache HTTP server project (http://www.apache.org/)."
 *
 * THIS SOFTWARE IS PROVIDED BY THE APACHE GROUP ``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 GROUP 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 Group and was originally based
 * on public domain software written at the National Center for
 * Supercomputing Applications, University of Illinois, Urbana-Champaign.
 * For more information on the Apache Group and the Apache HTTP server
 * project, please see <http://www.apache.org/>.
 *
 */


#ifndef _MOD_REWRITE_H
#define _MOD_REWRITE_H 1

/*
**                       _                            _ _
**   _ __ ___   ___   __| |    _ __ _____      ___ __(_) |_ ___
**  | '_ ` _ \ / _ \ / _` |   | '__/ _ \ \ /\ / / '__| | __/ _ \
**  | | | | | | (_) | (_| |   | | |  __/\ V  V /| |  | | ||  __/
**  |_| |_| |_|\___/ \__,_|___|_|  \___| \_/\_/ |_|  |_|\__\___|
**                       |_____|
**
**  URL Rewriting Module
**
**  This module uses a rule-based rewriting engine (based on a
**  regular-expression parser) to rewrite requested URLs on the fly.
**
**  It supports an unlimited number of additional rule conditions (which can
**  operate on a lot of variables, even on HTTP headers) for granular
**  matching and even external database lookups (either via plain text
**  tables, DBM hash files or even external processes) for advanced URL
**  substitution.
**
**  It operates on the full URLs (including the PATH_INFO part) both in
**  per-server context (httpd.conf) and per-dir context (.htaccess) and even
**  can generate QUERY_STRING parts on result.   The rewriting result finally
**  can lead to internal subprocessing, external request redirection or even
**  to internal proxy throughput.
**
**  This module was originally written in April 1996 and
**  gifted exclusively to the The Apache Group in July 1997 by
**
**      Ralf S. Engelschall
**      [e-mail]
**      www.engelschall.com
*/


    /* Include from the underlaying Unix system ... */
#include <string.h>
#include <stdarg.h>
#include <stdlib.h>
#include <time.h>
#include <signal.h>
#include <errno.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/stat.h>

    /* Include from the Apache server ... */
#include "httpd.h"
#include "http_config.h"
#include "http_conf_globals.h"
#include "http_request.h"
#include "http_core.h"
#include "http_log.h"
#include "http_vhost.h"

    /*
     * The key in the r->notes table wherein we store our accumulated
     * Vary values, and the one used for per-condition checks in a chain.
     */
#define VARY_KEY "rewrite-Vary"
#define VARY_KEY_THIS "rewrite-Vary-this"

    /* The NDBM support:
     * We support only NDBM files.
     * But we have to stat the file for the mtime,
     * so we also need to know the file extension
     */
#ifndef NO_DBM_REWRITEMAP
#include <ndbm.h>
#if (__FreeBSD__)
#define NDBM_FILE_SUFFIX ".db"
#else
#define NDBM_FILE_SUFFIX ".pag"
#endif
#endif


    /* The locking support:
     * Try to determine whether we should use fcntl() or flock().
     * Would be better ap_config.h could provide this... :-(
     */
#if defined(USE_FCNTL_SERIALIZED_ACCEPT)
#define USE_FCNTL 1
#include <fcntl.h>
#endif
#if defined(USE_FLOCK_SERIALIZED_ACCEPT)
#define USE_FLOCK 1
#include <sys/file.h>
#endif
#if !defined(USE_FCNTL) && !defined(USE_FLOCK)
#define USE_FLOCK 1
#if !defined(MPE) && !defined(WIN32)
#include <sys/file.h>
#endif
#ifndef LOCK_UN
#undef USE_FLOCK
#define USE_FCNTL 1
#include <fcntl.h>
#endif
#endif
#ifdef AIX
#undef USE_FLOCK
#define USE_FCNTL 1
#include <fcntl.h>
#endif
#ifdef WIN32
#undef USE_FCNTL
#define USE_LOCKING
#include <sys/locking.h>
#endif


/*
**
**  Some defines
**
*/

#define ENVVAR_SCRIPT_URL "SCRIPT_URL"
#define ENVVAR_SCRIPT_URI "SCRIPT_URI"

#ifndef SUPPORT_DBM_REWRITEMAP
#define SUPPORT_DBM_REWRITEMAP 0
#endif

#define REWRITE_FORCED_MIMETYPE_NOTEVAR "rewrite-forced-mimetype"

#define CONDFLAG_NONE               1<<0
#define CONDFLAG_NOCASE             1<<1
#define CONDFLAG_NOTMATCH           1<<2
#define CONDFLAG_ORNEXT             1<<3

#define RULEFLAG_NONE               1<<0
#define RULEFLAG_FORCEREDIRECT      1<<1
#define RULEFLAG_LASTRULE           1<<2
#define RULEFLAG_NEWROUND           1<<3
#define RULEFLAG_CHAIN              1<<4
#define RULEFLAG_IGNOREONSUBREQ     1<<5
#define RULEFLAG_NOTMATCH           1<<6
#define RULEFLAG_PROXY              1<<7
#define RULEFLAG_PASSTHROUGH        1<<8
#define RULEFLAG_FORBIDDEN          1<<9
#define RULEFLAG_GONE               1<<10
#define RULEFLAG_QSAPPEND           1<<11

#define MAPTYPE_TXT                 1<<0
#define MAPTYPE_DBM                 1<<1
#define MAPTYPE_PRG                 1<<2
#define MAPTYPE_INT                 1<<3
#define MAPTYPE_RND                 1<<4

#define ENGINE_DISABLED             1<<0
#define ENGINE_ENABLED              1<<1

#define OPTION_NONE                 1<<0
#define OPTION_INHERIT              1<<1

#define CACHEMODE_TS                1<<0
#define CACHEMODE_TTL               1<<1

#ifndef FALSE
#define FALSE 0
#define TRUE  !FALSE
#endif

#ifndef NO
#define NO    FALSE
#define YES   TRUE
#endif

#ifndef RAND_MAX
#define RAND_MAX 32767
#endif

#ifndef LONG_STRING_LEN
#define LONG_STRING_LEN 2048
#endif

#define MAX_ENV_FLAGS 15

#define MAX_NMATCH    10