httpd.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。

/* Copyright 1999-2005 The Apache Software Foundation or its licensors, as
 * applicable.
 *
 * Licensed 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.
 */

#ifndef APACHE_HTTPD_H
#define APACHE_HTTPD_H

/**
 * @file httpd.h
 * @brief HTTP Daemon routines
 */

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

/* Headers in which EVERYONE has an interest... */
#include "ap_config.h"
#include "ap_mmn.h"

#include "ap_release.h"

#include "apr_general.h"
#include "apr_tables.h"
#include "apr_pools.h"
#include "apr_time.h"
#include "apr_network_io.h"
#include "apr_buckets.h"

#include "os.h"

#include "pcreposix.h"

/* Note: util_uri.h is also included, see below */

#ifdef __cplusplus
extern "C" {
#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"
#elif defined (NETWARE)
/* Set the default for NetWare */
#define HTTPD_ROOT "/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 name of the log files */
#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 "/bin/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

/* 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"

#endif /* CORE_PRIVATE */

/** default HTTP Server protocol */
#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.  
 * @warning 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.
 */
/** HTML 2.0 Doctype */
#define DOCTYPE_HTML_2_0  "<!DOCTYPE HTML PUBLIC \"-//IETF//" \
                          "DTD HTML 2.0//EN\">\n"
/** HTML 3.2 Doctype */
#define DOCTYPE_HTML_3_2  "<!DOCTYPE HTML PUBLIC \"-//W3C//" \
                          "DTD HTML 3.2 Final//EN\">\n"
/** HTML 4.0 Strict Doctype */
#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"
/** HTML 4.0 Transitional Doctype */
#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"
/** HTML 4.0 Frameset Doctype */
#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"
/** XHTML 1.0 Strict Doctype */
#define DOCTYPE_XHTML_1_0S "<!DOCTYPE html PUBLIC \"-//W3C//" \
                           "DTD XHTML 1.0 Strict//EN\"\n" \
                           "\"http://www.w3.org/TR/xhtml1/DTD/" \
                           "xhtml1-strict.dtd\">\n"
/** XHTML 1.0 Transitional Doctype */
#define DOCTYPE_XHTML_1_0T "<!DOCTYPE html PUBLIC \"-//W3C//" \
                           "DTD XHTML 1.0 Transitional//EN\"\n" \
                           "\"http://www.w3.org/TR/xhtml1/DTD/" \
                           "xhtml1-transitional.dtd\">\n"
/** XHTML 1.0 Frameset Doctype */
#define DOCTYPE_XHTML_1_0F "<!DOCTYPE html PUBLIC \"-//W3C//" \
                           "DTD XHTML 1.0 Frameset//EN\"\n" \
                           "\"http://www.w3.org/TR/xhtml1/DTD/" \
                           "xhtml1-frameset.dtd\">"

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

#define HTTP_VERSION(major,minor) (1000*(major)+(minor))
/** Major part of HTTP protocol */
#define HTTP_VERSION_MAJOR(number) ((number)/1000)
/** Minor part of HTTP protocol */
#define HTTP_VERSION_MINOR(number) ((number)%1000)

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

/** default HTTP Port */
#define DEFAULT_HTTP_PORT	80
/** default HTTPS Port */
#define DEFAULT_HTTPS_PORT	443
/**
 * Check whether @a port is the default port for the request @a r.
 * @param port The port number
 * @param r The request
 * @see #ap_default_port
 */
#define ap_is_default_port(port,r)	((port) == ap_default_port(r))
/**
 * Get the default port for a request (which depends on the scheme).
 * @param r The request
 */
#define ap_default_port(r)	ap_run_default_port(r)
/**
 * Get the scheme for a request.
 * @param r The request
 * @bug This should be called ap_http_scheme!
 */
#define ap_http_method(r)	ap_run_http_method(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 AP_IOBUFSIZE 8192

/** The max number of regex captures that can be expanded by ap_pregsub */
#define AP_MAX_REG_MATCH 10

/**
 * APR_HAS_LARGE_FILES introduces the problem of spliting sendfile into 
 * mutiple buckets, no greater than MAX(apr_size_t), and more granular 
 * than that in case the brigade code/filters attempt to read it directly.
 * ### 16mb is an invention, no idea if it is reasonable.
 */
#define AP_MAX_SENDFILE 16777216  /* 2^24 */

/**
 * Special Apache error codes. These are basically used
 *  in http_main.c so we can keep track of various errors.
 *        
 */
/** a normal exit */
#define APEXIT_OK		0x0
/** A fatal error arising during the server's init sequence */
#define APEXIT_INIT		0x2
/**  The child died during its init sequence */
#define APEXIT_CHILDINIT	0x3
/**  
 *   The child exited due to a resource shortage.
 *   The parent should limit the rate of forking until
 *   the situation is resolved.
 */
#define APEXIT_CHILDSICK        0x7
/** 
 *     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_CHILDFATAL	0xf

#ifndef AP_DECLARE
/**
 * Stuff marked #AP_DECLARE is part of the API, and intended for use
 * by modules. Its purpose is to allow us to add attributes that
 * particular platforms or compilers require to every exported function.
 */
# define AP_DECLARE(type)    type
#endif

#ifndef AP_DECLARE_NONSTD
/**
 * 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.
 */
# define AP_DECLARE_NONSTD(type)    type
#endif
#ifndef AP_DECLARE_DATA
# define AP_DECLARE_DATA
#endif

#ifndef AP_MODULE_DECLARE
# define AP_MODULE_DECLARE(type)    type
#endif
#ifndef AP_MODULE_DECLARE_NONSTD
# define AP_MODULE_DECLARE_NONSTD(type)  type
#endif
#ifndef AP_MODULE_DECLARE_DATA
# define AP_MODULE_DECLARE_DATA
#endif

/**
 * @internal
 * modules should not used functions marked AP_CORE_DECLARE
 */
#ifndef AP_CORE_DECLARE
# define AP_CORE_DECLARE	AP_DECLARE
#endif
/**
 * @internal
 * modules should not used functions marked AP_CORE_DECLARE_NONSTD
 */

#ifndef AP_CORE_DECLARE_NONSTD
# define AP_CORE_DECLARE_NONSTD	AP_DECLARE_NONSTD
#endif

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

/**
 * Add a component to the version string
 * @param pconf The pool to allocate the component from
 * @param component The string to add
 */
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);

#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. */


/**
 * @defgroup HTTP_Status 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 57

#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