-/* ====================================================================
- * The Apache Software License, Version 1.1
+/* Copyright 1999-2004 The Apache Software Foundation
*
- * Copyright (c) 2000-2001 The Apache Software Foundation. All rights
- * reserved.
+ * 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
*
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
+ * http://www.apache.org/licenses/LICENSE-2.0
*
- * 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.
+ * 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 MOD_PROXY_H
#include "apr_hooks.h"
#include "apr.h"
-#include "apr_compat.h"
#include "apr_lib.h"
#include "apr_strings.h"
#include "apr_buckets.h"
#include "apr_strings.h"
#include "apr_uri.h"
#include "apr_date.h"
+#include "apr_strmatch.h"
#include "apr_fnmatch.h"
+#include "apr_reslist.h"
#define APR_WANT_STRFUNC
#include "apr_want.h"
#include "http_log.h"
#include "http_connection.h"
#include "util_filter.h"
+#include "util_ebcdic.h"
#if APR_HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif /*APR_CHARSET_EBCDIC*/
/* default Max-Forwards header setting */
-#define DEFAULT_MAX_FORWARDS 10
+#define DEFAULT_MAX_FORWARDS 10
/* static information about a remote proxy */
struct proxy_remote {
- const char *scheme; /* the schemes handled by this proxy, or '*' */
- const char *protocol; /* the scheme used to talk to this proxy */
- const char *hostname; /* the hostname of this proxy */
- apr_port_t port; /* the port for this proxy */
+ const char *scheme; /* the schemes handled by this proxy, or '*' */
+ const char *protocol; /* the scheme used to talk to this proxy */
+ const char *hostname; /* the hostname of this proxy */
+ apr_port_t port; /* the port for this proxy */
+ regex_t *regexp; /* compiled regex (if any) for the remote */
+ int use_regex; /* simple boolean. True if we have a regex pattern */
};
struct proxy_alias {
- const char *real;
- const char *fake;
+ const char *real;
+ const char *fake;
};
struct dirconn_entry {
struct apr_sockaddr_t *addr;
};
+typedef struct proxy_balancer proxy_balancer;
+typedef struct proxy_worker proxy_worker;
+typedef struct proxy_conn_pool proxy_conn_pool;
+
typedef struct {
apr_array_header_t *proxies;
apr_array_header_t *sec_proxy;
apr_array_header_t *noproxies;
apr_array_header_t *dirconn;
apr_array_header_t *allowed_connect_ports;
- const char *domain; /* domain name to use in absence of a domain name in the request */
- int req; /* true if proxy requests are enabled */
+ apr_array_header_t *workers;
+ apr_array_header_t *balancers;
+ proxy_worker *forward; /* forward proxy worker */
+ proxy_worker *reverse; /* reverse "module-driven" proxy worker */
+ const char *domain; /* domain name to use in absence of a domain name in the request */
+ int req; /* true if proxy requests are enabled */
char req_set;
enum {
via_off,
via_full
} viaopt; /* how to deal with proxy Via: headers */
char viaopt_set;
- size_t recv_buffer_size;
+ apr_size_t recv_buffer_size;
char recv_buffer_size_set;
+ apr_size_t io_buffer_size;
+ char io_buffer_size_set;
long maxfwd;
char maxfwd_set;
/**
int error_override_set;
int preserve_host;
int preserve_host_set;
- int timeout;
- int timeout_set;
-
+ apr_interval_time_t timeout;
+ char timeout_set;
+ enum {
+ bad_error,
+ bad_ignore,
+ bad_body
+ } badopt; /* how to deal with bad headers */
+ char badopt_set;
+/* putting new stuff on the end maximises binary back-compatibility.
+ * the strmatch_patterns are really a const just to have a
+ * case-independent strstr.
+ */
+ apr_array_header_t* cookie_paths;
+ apr_array_header_t* cookie_domains;
+ const apr_strmatch_pattern* cookie_path_str;
+ const apr_strmatch_pattern* cookie_domain_str;
+ enum {
+ status_off,
+ status_on,
+ status_full
+ } proxy_status; /* Status display options */
+ char proxy_status_set;
+ apr_pool_t *pool; /* Pool used for allocating this struct */
} proxy_server_conf;
+
typedef struct {
const char *p; /* The path */
int p_is_fnmatch; /* Is this path an fnmatch candidate? */
} proxy_dir_conf;
typedef struct {
- conn_rec *connection;
- char *hostname;
- apr_port_t port;
+ conn_rec *connection;
+ const char *hostname;
+ apr_port_t port;
+ int is_ssl;
+ apr_pool_t *pool; /* Subpool used for creating socket */
+ apr_socket_t *sock; /* Connection socket */
+ apr_sockaddr_t *addr; /* Preparsed remote address info */
+ apr_uint32_t flags; /* Conection flags */
+ int close; /* Close 'this' connection */
+ int close_on_recycle; /* Close the connection when returning to pool */
+ proxy_worker *worker; /* Connection pool this connection belogns to */
+ void *data; /* per scheme connection data */
} proxy_conn_rec;
typedef struct {
int content_length; /* length of the content */
} proxy_completion;
+/* Connection pool */
+struct proxy_conn_pool {
+ apr_pool_t *pool; /* The pool used in constructor and destructor calls */
+ apr_sockaddr_t *addr; /* Preparsed remote address info */
+#if APR_HAS_THREADS
+ apr_reslist_t *res; /* Connection resource list */
+#endif
+ proxy_conn_rec *conn; /* Single connection for prefork mpm's */
+};
+
+/* woker status flags */
+#define PROXY_WORKER_INITIALIZED 0x0001
+#define PROXY_WORKER_IGNORE_ERRORS 0x0002
+#define PROXY_WORKER_IN_SHUTDOWN 0x0010
+#define PROXY_WORKER_DISABLED 0x0020
+#define PROXY_WORKER_IN_ERROR 0x0040
+
+#define PROXY_WORKER_IS_USABLE(f) (!((f)->s->status & 0x00F0))
+
+/* default worker retry timeout in seconds */
+#define PROXY_WORKER_DEFAULT_RETRY 60
+#define PROXY_WORKER_MAX_ROUTE_SIZ 63
+
+/* Runtime worker status informations. Shared in scoreboard */
+typedef struct {
+ int status;
+ apr_time_t error_time; /* time of the last error */
+ int retries; /* number of retries on this worker */
+ int lbstatus; /* Current lbstatus */
+ int lbfactor; /* dynamic lbfactor */
+ apr_off_t transferred;/* Number of bytes transferred to remote */
+ apr_off_t read; /* Number of bytes read from remote */
+ apr_size_t elected; /* Number of times the worker was elected */
+ char route[PROXY_WORKER_MAX_ROUTE_SIZ+1];
+ char redirect[PROXY_WORKER_MAX_ROUTE_SIZ+1];
+} proxy_worker_stat;
+
+/* Worker configuration */
+struct proxy_worker {
+ int id; /* scoreboard id */
+ apr_interval_time_t retry; /* retry interval */
+ int lbfactor; /* initial load balancing factor */
+ const char *name;
+ const char *scheme; /* scheme to use ajp|http|https */
+ const char *hostname; /* remote backend address */
+ const char *route; /* balancing route */
+ const char *redirect; /* temporary balancing redirection route */
+ apr_port_t port;
+ int min; /* Desired minimum number of available connections */
+ int smax; /* Soft maximum on the total number of connections */
+ int hmax; /* Hard maximum on the total number of connections */
+ apr_interval_time_t ttl; /* maximum amount of time in seconds a connection
+ * may be available while exceeding the soft limit */
+ apr_interval_time_t timeout; /* connection timeout */
+ char timeout_set;
+ apr_interval_time_t acquire; /* acquire timeout when the maximum number of connections is exceeded */
+ char acquire_set;
+ apr_size_t recv_buffer_size;
+ char recv_buffer_size_set;
+ apr_size_t io_buffer_size;
+ char io_buffer_size_set;
+ char keepalive;
+ char keepalive_set;
+ proxy_conn_pool *cp; /* Connection pool to use */
+ proxy_worker_stat *s; /* Shared data */
+ void *opaque; /* per scheme worker data */
+ int is_address_reusable;
+#if APR_HAS_THREADS
+ apr_thread_mutex_t *mutex; /* Thread lock for updating address cache */
+#endif
+};
+
+struct proxy_balancer {
+ apr_array_header_t *workers; /* array of proxy_workers */
+ const char *name; /* name of the load balancer */
+ const char *sticky; /* sticky session identifier */
+ int sticky_force; /* Disable failover for sticky sessions */
+ apr_interval_time_t timeout; /* Timeout for waiting on free connection */
+ int max_attempts; /* Number of attempts before failing */
+ char max_attempts_set;
+ enum {
+ lbmethod_requests = 1,
+ lbmethod_traffic = 2
+ } lbmethod;
+
+ /* XXX: Perhaps we will need the proc mutex too.
+ * Altrough we are only using arithmetic operations
+ * it may lead to a incorrect calculations.
+ * For now use only the thread mutex.
+ */
+#if APR_HAS_THREADS
+ apr_thread_mutex_t *mutex; /* Thread lock for updating lb params */
+#endif
+};
+
+#if APR_HAS_THREADS
+#define PROXY_THREAD_LOCK(x) apr_thread_mutex_lock((x)->mutex)
+#define PROXY_THREAD_UNLOCK(x) apr_thread_mutex_unlock((x)->mutex)
+#else
+#define PROXY_THREAD_LOCK(x) APR_SUCCESS
+#define PROXY_THREAD_UNLOCK(x) APR_SUCCESS
+#endif
/* hooks */
#define PROXY_DECLARE_DATA __declspec(dllimport)
#endif
+/**
+ * Hook an optional proxy hook. Unlike static hooks, this uses a macro
+ * instead of a function.
+ */
+#define PROXY_OPTIONAL_HOOK(name,fn,pre,succ,order) \
+ APR_OPTIONAL_HOOK(proxy,name,fn,pre,succ,order)
+
APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, scheme_handler, (request_rec *r,
- proxy_server_conf *conf, char *url,
+ proxy_worker *worker, proxy_server_conf *conf, char *url,
const char *proxyhost, apr_port_t proxyport))
APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, canon_handler, (request_rec *r,
char *url))
APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, create_req, (request_rec *r, request_rec *pr))
+APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, fixups, (request_rec *r))
+
+/**
+ * pre request hook.
+ * It will return the most suitable worker at the moment
+ * and coresponding balancer.
+ * The url is rewritten from balancer://cluster/uri to scheme://host:port/uri
+ * and then the scheme_handler is called.
+ *
+ */
+APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, pre_request, (proxy_worker **worker,
+ proxy_balancer **balancer,
+ request_rec *r,
+ proxy_server_conf *conf, char **url))
+/**
+ * post request hook.
+ * It is called after request for updating runtime balancer status.
+ */
+APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, post_request, (proxy_worker *worker,
+ proxy_balancer *balancer, request_rec *r,
+ proxy_server_conf *conf))
+
/* proxy_util.c */
PROXY_DECLARE(int) ap_proxy_hex2c(const char *x);
PROXY_DECLARE(void) ap_proxy_c2hex(int ch, char *x);
PROXY_DECLARE(char *)ap_proxy_canonenc(apr_pool_t *p, const char *x, int len, enum enctype t,
- int isenc);
+ int forcedec, int proxyreq);
PROXY_DECLARE(char *)ap_proxy_canon_netloc(apr_pool_t *p, char **const urlp, char **userp,
- char **passwordp, char **hostp, apr_port_t *port);
+ char **passwordp, char **hostp, apr_port_t *port);
PROXY_DECLARE(const char *)ap_proxy_date_canon(apr_pool_t *p, const char *x);
-PROXY_DECLARE(apr_table_t *)ap_proxy_read_headers(request_rec *r, request_rec *rp, char *buffer, int size, conn_rec *c);
PROXY_DECLARE(int) ap_proxy_liststr(const char *list, const char *val);
PROXY_DECLARE(char *)ap_proxy_removestr(apr_pool_t *pool, const char *list, const char *val);
PROXY_DECLARE(int) ap_proxy_hex2sec(const char *x);
PROXY_DECLARE(int) ap_proxy_checkproxyblock(request_rec *r, proxy_server_conf *conf, apr_sockaddr_t *uri_addr);
PROXY_DECLARE(int) ap_proxy_pre_http_request(conn_rec *c, request_rec *r);
PROXY_DECLARE(apr_status_t) ap_proxy_string_read(conn_rec *c, apr_bucket_brigade *bb, char *buff, size_t bufflen, int *eos);
-PROXY_DECLARE(void) ap_proxy_reset_output_filters(conn_rec *c);
PROXY_DECLARE(void) ap_proxy_table_unmerge(apr_pool_t *p, apr_table_t *t, char *key);
+/* DEPRECATED (will be replaced with ap_proxy_connect_backend */
+PROXY_DECLARE(int) ap_proxy_connect_to_backend(apr_socket_t **, const char *, apr_sockaddr_t *, const char *, proxy_server_conf *, server_rec *, apr_pool_t *);
+PROXY_DECLARE(int) ap_proxy_ssl_enable(conn_rec *c);
+PROXY_DECLARE(int) ap_proxy_ssl_disable(conn_rec *c);
+
+/* Header mapping functions, and a typedef of their signature */
+PROXY_DECLARE(const char *) ap_proxy_location_reverse_map(request_rec *r, proxy_server_conf *conf, const char *url);
+PROXY_DECLARE(const char *) ap_proxy_cookie_reverse_map(request_rec *r, proxy_server_conf *conf, const char *str);
+
+#if !defined(WIN32)
+typedef const char *(*ap_proxy_header_reverse_map_fn)(request_rec *,
+ proxy_server_conf *, const char *);
+#elif defined(PROXY_DECLARE_STATIC)
+typedef const char *(__stdcall *ap_proxy_header_reverse_map_fn)(request_rec *,
+ proxy_server_conf *, const char *);
+#elif defined(PROXY_DECLARE_EXPORT)
+typedef __declspec(dllexport) const char *
+ (__stdcall *ap_proxy_header_reverse_map_fn)(request_rec *,
+ proxy_server_conf *, const char *);
+#else
+typedef __declspec(dllimport) const char *
+ (__stdcall *ap_proxy_header_reverse_map_fn)(request_rec *,
+ proxy_server_conf *, const char *);
+#endif
+
+
+/* Connection pool API */
+/**
+ * Get the worker from proxy configuration
+ * @param p memory pool used for finding worker
+ * @param conf current proxy server configuration
+ * @param url url to find the worker from
+ * @return proxy_worker or NULL if not found
+ */
+PROXY_DECLARE(proxy_worker *) ap_proxy_get_worker(apr_pool_t *p,
+ proxy_server_conf *conf,
+ const char *url);
+/**
+ * Add the worker to proxy configuration
+ * @param worker the new worker
+ * @param p memory pool to allocate worker from
+ * @param conf current proxy server configuration
+ * @param url url containing worker name
+ * @return error message or NULL if successfull
+ */
+PROXY_DECLARE(const char *) ap_proxy_add_worker(proxy_worker **worker,
+ apr_pool_t *p,
+ proxy_server_conf *conf,
+ const char *url);
+
+/**
+ * Create new worker
+ * @param p memory pool to allocate worker from
+ * @return new worker
+ */
+PROXY_DECLARE(proxy_worker *) ap_proxy_create_worker(apr_pool_t *p);
+
+/**
+ * Initize the worker's shared data
+ * @param conf current proxy server configuration
+ * @param worker worker to initialize
+ * @param s current server record
+ * @param worker worker to initialize
+ */
+PROXY_DECLARE(void) ap_proxy_initialize_worker_share(proxy_server_conf *conf,
+ proxy_worker *worker,
+ server_rec *s);
+
+
+/**
+ * Initize the worker
+ * @param worker worker to initialize
+ * @param s current server record
+ * @return APR_SUCCESS or error code
+ */
+PROXY_DECLARE(apr_status_t) ap_proxy_initialize_worker(proxy_worker *worker,
+ server_rec *s);
+/**
+ * Get the balancer from proxy configuration
+ * @param p memory pool used for finding balancer
+ * @param conf current proxy server configuration
+ * @param url url to find the worker from. Has to have balancer:// prefix
+ * @return proxy_balancer or NULL if not found
+ */
+PROXY_DECLARE(proxy_balancer *) ap_proxy_get_balancer(apr_pool_t *p,
+ proxy_server_conf *conf,
+ const char *url);
+/**
+ * Add the balancer to proxy configuration
+ * @param balancer the new balancer
+ * @param p memory pool to allocate balancer from
+ * @param conf current proxy server configuration
+ * @param url url containing balancer name
+ * @return error message or NULL if successfull
+ */
+PROXY_DECLARE(const char *) ap_proxy_add_balancer(proxy_balancer **balancer,
+ apr_pool_t *p,
+ proxy_server_conf *conf,
+ const char *url);
+
+/**
+ * Add the worker to the balancer
+ * @param pool memory pool for adding worker
+ * @param balancer balancer to add to
+ * @param balancer worker to add
+ * @note Single worker can be added to multiple balancers.
+ */
+PROXY_DECLARE(void) ap_proxy_add_worker_to_balancer(apr_pool_t *pool,
+ proxy_balancer *balancer,
+ proxy_worker *worker);
+/**
+ * Get the most suitable worker and(or) balancer for the request
+ * @param worker worker used for processing request
+ * @param balancer balancer used for processing request
+ * @param r current request
+ * @param conf current proxy server configuration
+ * @param url request url that balancer can rewrite.
+ * @return OK or HTTP_XXX error
+ * @note It calls balancer pre_request hook if the url starts with balancer://
+ * The balancer then rewrites the url to particular worker, like http://host:port
+ */
+PROXY_DECLARE(int) ap_proxy_pre_request(proxy_worker **worker,
+ proxy_balancer **balancer,
+ request_rec *r,
+ proxy_server_conf *conf,
+ char **url);
+/**
+ * Post request worker and balancer cleanup
+ * @param worker worker used for processing request
+ * @param balancer balancer used for processing request
+ * @param r current request
+ * @param conf current proxy server configuration
+ * @return OK or HTTP_XXX error
+ * @note When ever the pre_request is called, the post_request has to be
+ * called too.
+ */
+PROXY_DECLARE(int) ap_proxy_post_request(proxy_worker *worker,
+ proxy_balancer *balancer,
+ request_rec *r,
+ proxy_server_conf *conf);
+/**
+ * Deternime backend hostname and port
+ * @param p memory pool used for processing
+ * @param r current request
+ * @param conf current proxy server configuration
+ * @param worker worker used for processing request
+ * @param conn proxy connection struct
+ * @param uri processed uri
+ * @param url request url
+ * @param proxyname are we connecting directly or via s proxy
+ * @param proxyport proxy host port
+ * @param server_portstr Via headers server port
+ * @param server_portstr_size size of the server_portstr buffer
+ * @return OK or HTTP_XXX error
+ */
+PROXY_DECLARE(int) ap_proxy_determine_connection(apr_pool_t *p, request_rec *r,
+ proxy_server_conf *conf,
+ proxy_worker *worker,
+ proxy_conn_rec *conn,
+ apr_uri_t *uri,
+ char **url,
+ const char *proxyname,
+ apr_port_t proxyport,
+ char *server_portstr,
+ int server_portstr_size);
+/**
+ * Mark a worker for retry
+ * @param proxy_function calling proxy scheme (http, ajp, ...)
+ * @param conf current proxy server configuration
+ * @param worker worker used for retrying
+ * @param s current server record
+ * @return OK if marked for retry, DECLINED otherwise
+ * @note Worker will be marker for retry if the time of the last retry
+ * has been ellapsed. In case there is no retry option set, defaults to
+ * number_of_retries seconds.
+ */
+PROXY_DECLARE(int) ap_proxy_retry_worker(const char *proxy_function,
+ proxy_worker *worker,
+ server_rec *s);
+/**
+ * Acquire a connection from workers connection pool
+ * @param proxy_function calling proxy scheme (http, ajp, ...)
+ * @param conn acquired connection
+ * @param worker worker used for obtaining connection
+ * @param s current server record
+ * @return OK or HTTP_XXX error
+ * @note If the number of connections is exhaused the function will
+ * block untill the timeout is reached.
+ */
+PROXY_DECLARE(int) ap_proxy_acquire_connection(const char *proxy_function,
+ proxy_conn_rec **conn,
+ proxy_worker *worker,
+ server_rec *s);
+/**
+ * Release a connection back to worker connection pool
+ * @param proxy_function calling proxy scheme (http, ajp, ...)
+ * @param conn acquired connection
+ * @param s current server record
+ * @return OK or HTTP_XXX error
+ * @note The connection will be closed if conn->close_on_release is set
+ */
+PROXY_DECLARE(int) ap_proxy_release_connection(const char *proxy_function,
+ proxy_conn_rec *conn,
+ server_rec *s);
+/**
+ * Make a connection to the backend
+ * @param proxy_function calling proxy scheme (http, ajp, ...)
+ * @param conn acquired connection
+ * @param worker connection worker
+ * @param s current server record
+ * @return OK or HTTP_XXX error
+ * @note In case the socket already exists for conn, just check the link
+ * status.
+ */
+PROXY_DECLARE(int) ap_proxy_connect_backend(const char *proxy_function,
+ proxy_conn_rec *conn,
+ proxy_worker *worker,
+ server_rec *s);
+/**
+ * Make a connection record for backend connection
+ * @param proxy_function calling proxy scheme (http, ajp, ...)
+ * @param conn acquired connection
+ * @param c client connection record
+ * @param s current server record
+ * @return OK or HTTP_XXX error
+ */
+PROXY_DECLARE(int) ap_proxy_connection_create(const char *proxy_function,
+ proxy_conn_rec *conn,
+ conn_rec *c, server_rec *s);
+
+/* Scoreboard */
+#if MODULE_MAGIC_NUMBER_MAJOR > 20020903
+#define PROXY_HAS_SCOREBOARD 1
+#else
+#define PROXY_HAS_SCOREBOARD 0
+#endif
+
+/* The number of dynamic workers that can be added when reconfiguring.
+ * If this limit is reached you must stop and restart the server.
+ */
+#define PROXY_DYNAMIC_BALANCER_LIMIT 16
+/**
+ * Calculate number of maximum number of workers in scoreboard.
+ * @return number of workers to allocate in the scoreboard
+ */
+int ap_proxy_lb_workers(void);
+
+/* For proxy_util */
+extern module PROXY_DECLARE_DATA proxy_module;
+
+extern int PROXY_DECLARE_DATA proxy_lb_workers;
#endif /*MOD_PROXY_H*/
projects / apache / blobdiff