1 /* Licensed to the Apache Software Foundation (ASF) under one or more
2 * contributor license agreements. See the NOTICE file distributed with
3 * this work for additional information regarding copyright ownership.
4 * The ASF licenses this file to You under the Apache License, Version 2.0
5 * (the "License"); you may not use this file except in compliance with
6 * the License. You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
22 * @brief Proxy Extension Module for Apache
24 * @defgroup MOD_PROXY mod_proxy
25 * @ingroup APACHE_MODS
29 #include "apr_hooks.h"
32 #include "apr_strings.h"
33 #include "apr_buckets.h"
35 #include "apr_network_io.h"
36 #include "apr_pools.h"
37 #include "apr_strings.h"
40 #include "apr_strmatch.h"
41 #include "apr_fnmatch.h"
42 #include "apr_reslist.h"
43 #define APR_WANT_STRFUNC
45 #include "util_mutex.h"
46 #include "apr_global_mutex.h"
47 #include "apr_thread_mutex.h"
50 #include "http_config.h"
51 #include "ap_config.h"
52 #include "http_core.h"
53 #include "http_protocol.h"
54 #include "http_request.h"
55 #include "http_vhost.h"
56 #include "http_main.h"
58 #include "http_connection.h"
59 #include "util_filter.h"
60 #include "util_ebcdic.h"
61 #include "ap_provider.h"
62 #include "ap_slotmem.h"
64 #if APR_HAVE_NETINET_IN_H
65 #include <netinet/in.h>
67 #if APR_HAVE_ARPA_INET_H
68 #include <arpa/inet.h>
71 /* for proxy_canonenc() */
73 enc_path, enc_search, enc_user, enc_fpath, enc_parm
76 #define BALANCER_PREFIX "balancer://"
78 #if APR_CHARSET_EBCDIC
80 #else /*APR_CHARSET_EBCDIC*/
81 #define CRLF "\015\012"
82 #endif /*APR_CHARSET_EBCDIC*/
84 /* default Max-Forwards header setting */
85 /* Set this to -1, which complies with RFC2616 by not setting
86 * max-forwards if the client didn't send it to us.
88 #define DEFAULT_MAX_FORWARDS -1
90 /* static information about a remote proxy */
92 const char *scheme; /* the schemes handled by this proxy, or '*' */
93 const char *protocol; /* the scheme used to talk to this proxy */
94 const char *hostname; /* the hostname of this proxy */
95 ap_regex_t *regexp; /* compiled regex (if any) for the remote */
96 int use_regex; /* simple boolean. True if we have a regex pattern */
97 apr_port_t port; /* the port for this proxy */
100 #define PROXYPASS_NOCANON 0x01
101 #define PROXYPASS_INTERPOLATE 0x02
109 struct dirconn_entry {
111 struct in_addr addr, mask;
112 struct apr_sockaddr_t *hostaddr;
113 int (*matcher) (struct dirconn_entry * This, request_rec *r);
116 struct noproxy_entry {
118 struct apr_sockaddr_t *addr;
121 typedef struct proxy_balancer proxy_balancer;
122 typedef struct proxy_worker proxy_worker;
123 typedef struct proxy_conn_pool proxy_conn_pool;
124 typedef struct proxy_balancer_method proxy_balancer_method;
127 apr_array_header_t *proxies;
128 apr_array_header_t *sec_proxy;
129 apr_array_header_t *aliases;
130 apr_array_header_t *noproxies;
131 apr_array_header_t *dirconn;
132 apr_array_header_t *workers; /* non-balancer workers, eg ProxyPass http://example.com */
133 apr_array_header_t *balancers; /* list of balancers @ config time */
134 proxy_worker *forward; /* forward proxy worker */
135 proxy_worker *reverse; /* reverse "module-driven" proxy worker */
136 const char *domain; /* domain name to use in absence of a domain name in the request */
137 apr_pool_t *pool; /* Pool used for allocating this struct */
138 int req; /* true if proxy requests are enabled */
144 } viaopt; /* how to deal with proxy Via: headers */
145 apr_size_t recv_buffer_size;
146 apr_size_t io_buffer_size;
148 apr_interval_time_t timeout;
153 } badopt; /* how to deal with bad headers */
158 } proxy_status; /* Status display options */
159 apr_sockaddr_t *source_address;
160 apr_global_mutex_t *mutex; /* global lock for updating lb params */
164 int recv_buffer_size_set:1;
165 int io_buffer_size_set:1;
169 int proxy_status_set:1;
170 int source_address_set:1;
175 const char *p; /* The path */
176 ap_regex_t *r; /* Is this a regex? */
179 * ProxyPassReverse and friends are documented as working inside
180 * <Location>. But in fact they never have done in the case of
181 * more than one <Location>, because the server_conf can't see it.
182 * We need to move them to the per-dir config.
183 * Discussed in February 2005:
184 * http://marc.theaimsgroup.com/?l=apache-httpd-dev&m=110726027118798&w=2
186 apr_array_header_t *raliases;
187 apr_array_header_t* cookie_paths;
188 apr_array_header_t* cookie_domains;
189 const apr_strmatch_pattern* cookie_path_str;
190 const apr_strmatch_pattern* cookie_domain_str;
191 signed char p_is_fnmatch; /* Is the path an fnmatch candidate? */
192 signed char interpolate_env;
193 struct proxy_alias *alias;
196 * the following setting masks the error page
197 * returned from the 'proxied server' and just
198 * forwards the status code upwards.
199 * This allows the main server (us) to generate
200 * the error page, (so it will look like a error
201 * returned from the rest of the system
203 int error_override:1;
205 int preserve_host_set:1;
206 int error_override_set:1;
210 /* if we interpolate env vars per-request, we'll need a per-request
211 * copy of the reverse proxy config
214 apr_array_header_t *raliases;
215 apr_array_header_t* cookie_paths;
216 apr_array_header_t* cookie_domains;
220 conn_rec *connection;
221 request_rec *r; /* Request record of the backend request
222 * that is used over the backend connection. */
223 proxy_worker *worker; /* Connection pool this connection belongs to */
224 apr_pool_t *pool; /* Subpool for hostname and addr data */
225 const char *hostname;
226 apr_sockaddr_t *addr; /* Preparsed remote address info */
227 apr_pool_t *scpool; /* Subpool used for socket and connection data */
228 apr_socket_t *sock; /* Connection socket */
229 void *data; /* per scheme connection data */
230 void *forward; /* opaque forward proxy data */
231 apr_uint32_t flags; /* Connection flags */
234 int close:1; /* Close 'this' connection */
235 int need_flush:1; /* Flag to decide whether we need to flush the
236 * filter chain or not */
237 int inreslist:1; /* connection in apr_reslist? */
241 float cache_completion; /* completion percentage */
242 int content_length; /* length of the content */
245 /* Connection pool */
246 struct proxy_conn_pool {
247 apr_pool_t *pool; /* The pool used in constructor and destructor calls */
248 apr_sockaddr_t *addr; /* Preparsed remote address info */
249 apr_reslist_t *res; /* Connection resource list */
250 proxy_conn_rec *conn; /* Single connection for prefork mpm */
253 /* worker status flags */
254 #define PROXY_WORKER_INITIALIZED 0x0001
255 #define PROXY_WORKER_IGNORE_ERRORS 0x0002
256 #define PROXY_WORKER_DRAIN 0x0004
257 #define PROXY_WORKER_IN_SHUTDOWN 0x0010
258 #define PROXY_WORKER_DISABLED 0x0020
259 #define PROXY_WORKER_STOPPED 0x0040
260 #define PROXY_WORKER_IN_ERROR 0x0080
261 #define PROXY_WORKER_HOT_STANDBY 0x0100
262 #define PROXY_WORKER_FREE 0x0200
264 #define PROXY_WORKER_NOT_USABLE_BITMAP ( PROXY_WORKER_IN_SHUTDOWN | \
265 PROXY_WORKER_DISABLED | PROXY_WORKER_STOPPED | PROXY_WORKER_IN_ERROR )
267 /* NOTE: these check the shared status */
268 #define PROXY_WORKER_IS_INITIALIZED(f) ( (f)->s->status & PROXY_WORKER_INITIALIZED )
270 #define PROXY_WORKER_IS_STANDBY(f) ( (f)->s->status & PROXY_WORKER_HOT_STANDBY )
272 #define PROXY_WORKER_IS_USABLE(f) ( ( !( (f)->s->status & PROXY_WORKER_NOT_USABLE_BITMAP) ) && \
273 PROXY_WORKER_IS_INITIALIZED(f) )
275 /* default worker retry timeout in seconds */
276 #define PROXY_WORKER_DEFAULT_RETRY 60
277 #define PROXY_WORKER_MAX_SCHEME_SIZE 16
278 #define PROXY_WORKER_MAX_ROUTE_SIZE 64
279 #define PROXY_WORKER_MAX_NAME_SIZE 96
281 #define PROXY_STRNCPY(dst, src) apr_cpystrn((dst), (src), sizeof(dst))
283 /* Runtime worker status informations. Shared in scoreboard */
285 char name[PROXY_WORKER_MAX_NAME_SIZE];
286 char scheme[PROXY_WORKER_MAX_SCHEME_SIZE]; /* scheme to use ajp|http|https */
287 char hostname[PROXY_WORKER_MAX_ROUTE_SIZE]; /* remote backend address */
288 char route[PROXY_WORKER_MAX_ROUTE_SIZE]; /* balancing route */
289 char redirect[PROXY_WORKER_MAX_ROUTE_SIZE]; /* temporary balancing redirection route */
290 char flusher[PROXY_WORKER_MAX_SCHEME_SIZE]; /* flush provider used by mod_proxy_fdpass */
291 int lbset; /* load balancer cluster set */
293 int retries; /* number of retries on this worker */
294 int lbstatus; /* Current lbstatus */
295 int lbfactor; /* dynamic lbfactor */
296 int min; /* Desired minimum number of available connections */
297 int smax; /* Soft maximum on the total number of connections */
298 int hmax; /* Hard maximum on the total number of connections */
299 int flush_wait; /* poll wait time in microseconds if flush_auto */
300 int index; /* shm array index */
301 unsigned int hash; /* hash of worker name */
306 } flush_packets; /* control AJP flushing */
307 apr_time_t error_time; /* time of the last error */
308 apr_interval_time_t ttl; /* maximum amount of time in seconds a connection
309 * may be available while exceeding the soft limit */
310 apr_interval_time_t retry; /* retry interval */
311 apr_interval_time_t timeout; /* connection timeout */
312 apr_interval_time_t acquire; /* acquire timeout when the maximum number of connections is exceeded */
313 apr_interval_time_t ping_timeout;
314 apr_interval_time_t conn_timeout;
315 apr_size_t recv_buffer_size;
316 apr_size_t io_buffer_size;
317 apr_size_t elected; /* Number of times the worker was elected */
318 apr_size_t busy; /* busyness factor */
320 apr_off_t transferred;/* Number of bytes transferred to remote */
321 apr_off_t read; /* Number of bytes read from remote */
322 void *context; /* general purpose storage */
323 unsigned int keepalive:1;
324 unsigned int disablereuse:1;
325 unsigned int is_address_reusable:1;
326 unsigned int retry_set:1;
327 unsigned int timeout_set:1;
328 unsigned int acquire_set:1;
329 unsigned int ping_timeout_set:1;
330 unsigned int conn_timeout_set:1;
331 unsigned int recv_buffer_size_set:1;
332 unsigned int io_buffer_size_set:1;
333 unsigned int keepalive_set:1;
334 unsigned int disablereuse_set:1;
335 } proxy_worker_shared;
337 /* Worker configuration */
338 struct proxy_worker {
339 int index; /* shm array index */
340 unsigned int hash; /* hash of worker name */
341 proxy_conn_pool *cp; /* Connection pool to use */
342 proxy_worker_shared *s; /* Shared data */
343 proxy_balancer *balancer; /* which balancer am I in? */
344 apr_thread_mutex_t *mutex; /* Thread lock for updating address cache */
345 void *context; /* general purpose storage */
349 * Time to wait (in microseconds) to find out if more data is currently
350 * available at the backend.
352 #define PROXY_FLUSH_WAIT 10000
354 struct proxy_balancer {
355 apr_array_header_t *workers; /* initially configured workers */
356 ap_slotmem_instance_t *slot; /* worker shm data - runtime */
357 int growth; /* number of post-config workers can added */
358 int max_workers; /* maximum number of allowed workers */
359 const char *name; /* name of the load balancer */
360 apr_interval_time_t timeout; /* Timeout for waiting on free connection */
361 const char *lbprovider; /* name of the lbmethod provider to use */
362 proxy_balancer_method *lbmethod;
364 const char *sticky_path; /* URL sticky session identifier */
365 apr_array_header_t *errstatuses; /* statuses to force members into error */
366 const char *sticky; /* sticky session identifier */
367 int max_attempts; /* Number of attempts before failing */
369 int sticky_force:1; /* Disable failover for sticky sessions */
370 int scolonsep:1; /* true if ';' seps sticky session paths */
371 int max_attempts_set:1;
372 void *context; /* general purpose storage */
373 apr_time_t updated; /* timestamp of last update */
376 struct proxy_balancer_method {
377 const char *name; /* name of the load balancer method*/
378 proxy_worker *(*finder)(proxy_balancer *balancer,
380 void *context; /* general purpose storage */
381 apr_status_t (*reset)(proxy_balancer *balancer, server_rec *s);
382 apr_status_t (*age)(proxy_balancer *balancer, server_rec *s);
383 apr_status_t (*updatelbstatus)(proxy_balancer *balancer, proxy_worker *elected, server_rec *s);
386 #define PROXY_THREAD_LOCK(x) apr_thread_mutex_lock((x)->mutex)
387 #define PROXY_THREAD_UNLOCK(x) apr_thread_mutex_unlock((x)->mutex)
389 #define PROXY_GLOBAL_LOCK(x) apr_global_mutex_lock((x)->mutex)
390 #define PROXY_GLOBAL_UNLOCK(x) apr_global_mutex_unlock((x)->mutex)
394 /* Create a set of PROXY_DECLARE(type), PROXY_DECLARE_NONSTD(type) and
395 * PROXY_DECLARE_DATA with appropriate export and import tags for the platform
398 #define PROXY_DECLARE(type) type
399 #define PROXY_DECLARE_NONSTD(type) type
400 #define PROXY_DECLARE_DATA
401 #elif defined(PROXY_DECLARE_STATIC)
402 #define PROXY_DECLARE(type) type __stdcall
403 #define PROXY_DECLARE_NONSTD(type) type
404 #define PROXY_DECLARE_DATA
405 #elif defined(PROXY_DECLARE_EXPORT)
406 #define PROXY_DECLARE(type) __declspec(dllexport) type __stdcall
407 #define PROXY_DECLARE_NONSTD(type) __declspec(dllexport) type
408 #define PROXY_DECLARE_DATA __declspec(dllexport)
410 #define PROXY_DECLARE(type) __declspec(dllimport) type __stdcall
411 #define PROXY_DECLARE_NONSTD(type) __declspec(dllimport) type
412 #define PROXY_DECLARE_DATA __declspec(dllimport)
416 * Hook an optional proxy hook. Unlike static hooks, this uses a macro
417 * instead of a function.
419 #define PROXY_OPTIONAL_HOOK(name,fn,pre,succ,order) \
420 APR_OPTIONAL_HOOK(proxy,name,fn,pre,succ,order)
422 APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, scheme_handler, (request_rec *r,
423 proxy_worker *worker, proxy_server_conf *conf, char *url,
424 const char *proxyhost, apr_port_t proxyport))
425 APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, canon_handler, (request_rec *r,
428 APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, create_req, (request_rec *r, request_rec *pr))
429 APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, fixups, (request_rec *r))
433 * It will return the most suitable worker at the moment
434 * and coresponding balancer.
435 * The url is rewritten from balancer://cluster/uri to scheme://host:port/uri
436 * and then the scheme_handler is called.
439 APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, pre_request, (proxy_worker **worker,
440 proxy_balancer **balancer,
442 proxy_server_conf *conf, char **url))
445 * It is called after request for updating runtime balancer status.
447 APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, post_request, (proxy_worker *worker,
448 proxy_balancer *balancer, request_rec *r,
449 proxy_server_conf *conf))
452 * request status hook
453 * It is called after all proxy processing has been done. This gives other
454 * modules a chance to create default content on failure, for example
456 APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, request_status,
457 (int *status, request_rec *r))
461 PROXY_DECLARE(request_rec *)ap_proxy_make_fake_req(conn_rec *c, request_rec *r);
462 PROXY_DECLARE(int) ap_proxy_hex2c(const char *x);
463 PROXY_DECLARE(void) ap_proxy_c2hex(int ch, char *x);
464 PROXY_DECLARE(char *)ap_proxy_canonenc(apr_pool_t *p, const char *x, int len, enum enctype t,
465 int forcedec, int proxyreq);
466 PROXY_DECLARE(char *)ap_proxy_canon_netloc(apr_pool_t *p, char **const urlp, char **userp,
467 char **passwordp, char **hostp, apr_port_t *port);
468 PROXY_DECLARE(const char *)ap_proxy_date_canon(apr_pool_t *p, const char *x);
469 PROXY_DECLARE(int) ap_proxy_liststr(const char *list, const char *val);
470 PROXY_DECLARE(char *)ap_proxy_removestr(apr_pool_t *pool, const char *list, const char *val);
471 PROXY_DECLARE(int) ap_proxy_hex2sec(const char *x);
472 PROXY_DECLARE(void) ap_proxy_sec2hex(int t, char *y);
473 PROXY_DECLARE(int) ap_proxyerror(request_rec *r, int statuscode, const char *message);
474 PROXY_DECLARE(int) ap_proxy_is_ipaddr(struct dirconn_entry *This, apr_pool_t *p);
475 PROXY_DECLARE(int) ap_proxy_is_domainname(struct dirconn_entry *This, apr_pool_t *p);
476 PROXY_DECLARE(int) ap_proxy_is_hostname(struct dirconn_entry *This, apr_pool_t *p);
477 PROXY_DECLARE(int) ap_proxy_is_word(struct dirconn_entry *This, apr_pool_t *p);
478 PROXY_DECLARE(int) ap_proxy_checkproxyblock(request_rec *r, proxy_server_conf *conf, apr_sockaddr_t *uri_addr);
479 PROXY_DECLARE(int) ap_proxy_pre_http_request(conn_rec *c, request_rec *r);
480 PROXY_DECLARE(apr_status_t) ap_proxy_string_read(conn_rec *c, apr_bucket_brigade *bb, char *buff, size_t bufflen, int *eos);
481 PROXY_DECLARE(void) ap_proxy_table_unmerge(apr_pool_t *p, apr_table_t *t, char *key);
482 /* DEPRECATED (will be replaced with ap_proxy_connect_backend */
483 PROXY_DECLARE(int) ap_proxy_connect_to_backend(apr_socket_t **, const char *, apr_sockaddr_t *, const char *, proxy_server_conf *, request_rec *);
484 PROXY_DECLARE(apr_status_t) ap_proxy_ssl_connection_cleanup(proxy_conn_rec *conn,
486 PROXY_DECLARE(int) ap_proxy_ssl_enable(conn_rec *c);
487 PROXY_DECLARE(int) ap_proxy_ssl_disable(conn_rec *c);
488 PROXY_DECLARE(int) ap_proxy_conn_is_https(conn_rec *c);
489 PROXY_DECLARE(const char *) ap_proxy_ssl_val(apr_pool_t *p, server_rec *s, conn_rec *c, request_rec *r, const char *var);
491 /* Header mapping functions, and a typedef of their signature */
492 PROXY_DECLARE(const char *) ap_proxy_location_reverse_map(request_rec *r, proxy_dir_conf *conf, const char *url);
493 PROXY_DECLARE(const char *) ap_proxy_cookie_reverse_map(request_rec *r, proxy_dir_conf *conf, const char *str);
496 typedef const char *(*ap_proxy_header_reverse_map_fn)(request_rec *,
497 proxy_dir_conf *, const char *);
498 #elif defined(PROXY_DECLARE_STATIC)
499 typedef const char *(__stdcall *ap_proxy_header_reverse_map_fn)(request_rec *,
500 proxy_dir_conf *, const char *);
501 #elif defined(PROXY_DECLARE_EXPORT)
502 typedef __declspec(dllexport) const char *
503 (__stdcall *ap_proxy_header_reverse_map_fn)(request_rec *,
504 proxy_dir_conf *, const char *);
506 typedef __declspec(dllimport) const char *
507 (__stdcall *ap_proxy_header_reverse_map_fn)(request_rec *,
508 proxy_dir_conf *, const char *);
512 /* Connection pool API */
514 * Get the worker from proxy configuration
515 * @param p memory pool used for finding worker
516 * @param balancer the balancer that the worker belongs to
517 * @param conf current proxy server configuration
518 * @param url url to find the worker from
519 * @return proxy_worker or NULL if not found
521 PROXY_DECLARE(proxy_worker *) ap_proxy_get_worker(apr_pool_t *p,
522 proxy_balancer *balancer,
523 proxy_server_conf *conf,
526 * Define and Allocate space for the worker to proxy configuration
527 * @param p memory pool to allocate worker from
528 * @param worker the new worker
529 * @param balancer the balancer that the worker belongs to
530 * @param conf current proxy server configuration
531 * @param url url containing worker name
532 * @return error message or NULL if successful (*worker is new worker)
534 PROXY_DECLARE(char *) ap_proxy_define_worker(apr_pool_t *p,
535 proxy_worker **worker,
536 proxy_balancer *balancer,
537 proxy_server_conf *conf,
541 * Share a defined proxy worker via shm
542 * @param worker worker to be shared
543 * @param shm location of shared info
544 * @param i index into shm
545 * @return APR_SUCCESS or error code
547 PROXY_DECLARE(apr_status_t) ap_proxy_share_worker(proxy_worker *worker, proxy_worker_shared *shm, int i);
550 * Initialize the worker by setting up worker connection pool and mutex
551 * @param worker worker to initialize
552 * @param s current server record
553 * @param p memory pool used for mutex and connection pool
554 * @return APR_SUCCESS or error code
556 PROXY_DECLARE(apr_status_t) ap_proxy_initialize_worker(proxy_worker *worker,
561 * Verifies valid balancer name (eg: balancer://foo)
562 * @param name name to test
563 * @return ptr to start of name or NULL if not valid
565 PROXY_DECLARE(char *) ap_proxy_valid_balancer_name(char *name);
569 * Get the balancer from proxy configuration
570 * @param p memory pool used for temporary storage while finding balancer
571 * @param conf current proxy server configuration
572 * @param url url to find the worker from; must have balancer:// prefix
573 * @return proxy_balancer or NULL if not found
575 PROXY_DECLARE(proxy_balancer *) ap_proxy_get_balancer(apr_pool_t *p,
576 proxy_server_conf *conf,
580 * Define and Allocate space for the balancer to proxy configuration
581 * @param p memory pool to allocate balancer from
582 * @param balancer the new balancer
583 * @param conf current proxy server configuration
584 * @param url url containing balancer name
585 * @return error message or NULL if successfull
587 PROXY_DECLARE(char *) ap_proxy_define_balancer(apr_pool_t *p,
588 proxy_balancer **balancer,
589 proxy_server_conf *conf,
593 * Get the most suitable worker and/or balancer for the request
594 * @param worker worker used for processing request
595 * @param balancer balancer used for processing request
596 * @param r current request
597 * @param conf current proxy server configuration
598 * @param url request url that balancer can rewrite.
599 * @return OK or HTTP_XXX error
600 * @note It calls balancer pre_request hook if the url starts with balancer://
601 * The balancer then rewrites the url to particular worker, like http://host:port
603 PROXY_DECLARE(int) ap_proxy_pre_request(proxy_worker **worker,
604 proxy_balancer **balancer,
606 proxy_server_conf *conf,
609 * Post request worker and balancer cleanup
610 * @param worker worker used for processing request
611 * @param balancer balancer used for processing request
612 * @param r current request
613 * @param conf current proxy server configuration
614 * @return OK or HTTP_XXX error
615 * @note Whenever the pre_request is called, the post_request has to be
618 PROXY_DECLARE(int) ap_proxy_post_request(proxy_worker *worker,
619 proxy_balancer *balancer,
621 proxy_server_conf *conf);
624 * Request status function
625 * @param status status of proxy request (result)
626 * @param r the request to obtain the status for
627 * @return OK or DECLINED
629 PROXY_DECLARE(int) ap_proxy_request_status(int *status, request_rec *r);
632 * Determine backend hostname and port
633 * @param p memory pool used for processing
634 * @param r current request
635 * @param conf current proxy server configuration
636 * @param worker worker used for processing request
637 * @param conn proxy connection struct
638 * @param uri processed uri
639 * @param url request url
640 * @param proxyname are we connecting directly or via a proxy
641 * @param proxyport proxy host port
642 * @param server_portstr Via headers server port
643 * @param server_portstr_size size of the server_portstr buffer
644 * @return OK or HTTP_XXX error
646 PROXY_DECLARE(int) ap_proxy_determine_connection(apr_pool_t *p, request_rec *r,
647 proxy_server_conf *conf,
648 proxy_worker *worker,
649 proxy_conn_rec *conn,
652 const char *proxyname,
653 apr_port_t proxyport,
654 char *server_portstr,
655 int server_portstr_size);
658 * Mark a worker for retry
659 * @param proxy_function calling proxy scheme (http, ajp, ...)
660 * @param worker worker used for retrying
661 * @param s current server record
662 * @return OK if marked for retry, DECLINED otherwise
663 * @note The error status of the worker will cleared if the retry interval has
664 * elapsed since the last error.
666 PROXY_DECLARE(int) ap_proxy_retry_worker(const char *proxy_function,
667 proxy_worker *worker,
671 * Acquire a connection from worker connection pool
672 * @param proxy_function calling proxy scheme (http, ajp, ...)
673 * @param conn acquired connection
674 * @param worker worker used for obtaining connection
675 * @param s current server record
676 * @return OK or HTTP_XXX error
677 * @note If the connection limit has been reached, the function will
678 * block until a connection becomes available or the timeout has
681 PROXY_DECLARE(int) ap_proxy_acquire_connection(const char *proxy_function,
682 proxy_conn_rec **conn,
683 proxy_worker *worker,
686 * Release a connection back to worker connection pool
687 * @param proxy_function calling proxy scheme (http, ajp, ...)
688 * @param conn acquired connection
689 * @param s current server record
690 * @return OK or HTTP_XXX error
691 * @note The connection will be closed if conn->close_on_release is set
693 PROXY_DECLARE(int) ap_proxy_release_connection(const char *proxy_function,
694 proxy_conn_rec *conn,
697 * Make a connection to the backend
698 * @param proxy_function calling proxy scheme (http, ajp, ...)
699 * @param conn acquired connection
700 * @param worker connection worker
701 * @param s current server record
702 * @return OK or HTTP_XXX error
703 * @note In case the socket already exists for conn, just check the link
706 PROXY_DECLARE(int) ap_proxy_connect_backend(const char *proxy_function,
707 proxy_conn_rec *conn,
708 proxy_worker *worker,
711 * Make a connection record for backend connection
712 * @param proxy_function calling proxy scheme (http, ajp, ...)
713 * @param conn acquired connection
714 * @param c client connection record
715 * @param s current server record
716 * @return OK or HTTP_XXX error
717 * @note The function will return immediately if conn->connection
720 PROXY_DECLARE(int) ap_proxy_connection_create(const char *proxy_function,
721 proxy_conn_rec *conn,
722 conn_rec *c, server_rec *s);
724 * Signal the upstream chain that the connection to the backend broke in the
725 * middle of the response. This is done by sending an error bucket with
726 * status HTTP_BAD_GATEWAY and an EOS bucket up the filter chain.
727 * @param r current request record of client request
728 * @param brigade The brigade that is sent through the output filter chain
730 PROXY_DECLARE(void) ap_proxy_backend_broke(request_rec *r,
731 apr_bucket_brigade *brigade);
734 * Transform buckets from one bucket allocator to another one by creating a
735 * transient bucket for each data bucket and let it use the data read from
736 * the old bucket. Metabuckets are transformed by just recreating them.
737 * Attention: Currently only the following bucket types are handled:
743 * If an other bucket type is found its type is logged as a debug message
744 * and APR_EGENERAL is returned.
745 * @param r current request record of client request. Only used for logging
747 * @param from the brigade that contains the buckets to transform
748 * @param to the brigade that will receive the transformed buckets
749 * @return APR_SUCCESS if all buckets could be transformed APR_EGENERAL
752 PROXY_DECLARE(apr_status_t)
753 ap_proxy_buckets_lifetime_transform(request_rec *r, apr_bucket_brigade *from,
754 apr_bucket_brigade *to);
756 * Return a hash based on the passed string
757 * @param str string to produce hash from
758 * @param method hashing method to use
759 * @return hash as unsigned int
762 typedef enum { PROXY_HASHFUNC_DEFAULT, PROXY_HASHFUNC_APR, PROXY_HASHFUNC_FNV } proxy_hash_t;
764 PROXY_DECLARE(unsigned int)
765 ap_proxy_hashfunc(const char *str, proxy_hash_t method);
767 #define PROXY_LBMETHOD "proxylbmethod"
769 /* The number of dynamic workers that can be added when reconfiguring.
770 * If this limit is reached you must stop and restart the server.
772 #define PROXY_DYNAMIC_BALANCER_LIMIT 16
775 * Calculate maximum number of workers in scoreboard.
776 * @return number of workers to allocate in the scoreboard
778 int ap_proxy_lb_workers(void);
781 extern module PROXY_DECLARE_DATA proxy_module;
783 extern int PROXY_DECLARE_DATA proxy_lb_workers;
785 #endif /*MOD_PROXY_H*/