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
46 #include "util_mutex.h"
47 #include "apr_global_mutex.h"
48 #include "apr_thread_mutex.h"
51 #include "http_config.h"
52 #include "ap_config.h"
53 #include "http_core.h"
54 #include "http_protocol.h"
55 #include "http_request.h"
56 #include "http_vhost.h"
57 #include "http_main.h"
59 #include "http_connection.h"
60 #include "util_filter.h"
61 #include "util_ebcdic.h"
63 #include "ap_provider.h"
64 #include "ap_slotmem.h"
66 #if APR_HAVE_NETINET_IN_H
67 #include <netinet/in.h>
69 #if APR_HAVE_ARPA_INET_H
70 #include <arpa/inet.h>
73 /* for proxy_canonenc() */
75 enc_path, enc_search, enc_user, enc_fpath, enc_parm
78 #define BALANCER_PREFIX "balancer://"
80 #if APR_CHARSET_EBCDIC
82 #else /*APR_CHARSET_EBCDIC*/
83 #define CRLF "\015\012"
84 #endif /*APR_CHARSET_EBCDIC*/
86 /* default Max-Forwards header setting */
87 /* Set this to -1, which complies with RFC2616 by not setting
88 * max-forwards if the client didn't send it to us.
90 #define DEFAULT_MAX_FORWARDS -1
92 /* static information about a remote proxy */
94 const char *scheme; /* the schemes handled by this proxy, or '*' */
95 const char *protocol; /* the scheme used to talk to this proxy */
96 const char *hostname; /* the hostname of this proxy */
97 ap_regex_t *regexp; /* compiled regex (if any) for the remote */
98 int use_regex; /* simple boolean. True if we have a regex pattern */
99 apr_port_t port; /* the port for this proxy */
102 #define PROXYPASS_NOCANON 0x01
103 #define PROXYPASS_INTERPOLATE 0x02
111 struct dirconn_entry {
113 struct in_addr addr, mask;
114 struct apr_sockaddr_t *hostaddr;
115 int (*matcher) (struct dirconn_entry * This, request_rec *r);
118 struct noproxy_entry {
120 struct apr_sockaddr_t *addr;
123 typedef struct proxy_balancer proxy_balancer;
124 typedef struct proxy_worker proxy_worker;
125 typedef struct proxy_conn_pool proxy_conn_pool;
126 typedef struct proxy_balancer_method proxy_balancer_method;
129 apr_array_header_t *proxies;
130 apr_array_header_t *sec_proxy;
131 apr_array_header_t *aliases;
132 apr_array_header_t *noproxies;
133 apr_array_header_t *dirconn;
134 apr_array_header_t *workers; /* non-balancer workers, eg ProxyPass http://example.com */
135 apr_array_header_t *balancers; /* list of balancers @ config time */
136 proxy_worker *forward; /* forward proxy worker */
137 proxy_worker *reverse; /* reverse "module-driven" proxy worker */
138 const char *domain; /* domain name to use in absence of a domain name in the request */
139 apr_pool_t *pool; /* Pool used for allocating this struct */
140 int req; /* true if proxy requests are enabled */
146 } viaopt; /* how to deal with proxy Via: headers */
147 apr_size_t recv_buffer_size;
148 apr_size_t io_buffer_size;
150 apr_interval_time_t timeout;
155 } badopt; /* how to deal with bad headers */
160 } proxy_status; /* Status display options */
161 apr_sockaddr_t *source_address;
162 apr_global_mutex_t *mutex; /* global lock (needed??) */
166 int recv_buffer_size_set:1;
167 int io_buffer_size_set:1;
171 int proxy_status_set:1;
172 int source_address_set:1;
177 const char *p; /* The path */
178 ap_regex_t *r; /* Is this a regex? */
181 * ProxyPassReverse and friends are documented as working inside
182 * <Location>. But in fact they never have done in the case of
183 * more than one <Location>, because the server_conf can't see it.
184 * We need to move them to the per-dir config.
185 * Discussed in February 2005:
186 * http://marc.theaimsgroup.com/?l=apache-httpd-dev&m=110726027118798&w=2
188 apr_array_header_t *raliases;
189 apr_array_header_t* cookie_paths;
190 apr_array_header_t* cookie_domains;
191 const apr_strmatch_pattern* cookie_path_str;
192 const apr_strmatch_pattern* cookie_domain_str;
193 signed char p_is_fnmatch; /* Is the path an fnmatch candidate? */
194 signed char interpolate_env;
195 struct proxy_alias *alias;
198 * the following setting masks the error page
199 * returned from the 'proxied server' and just
200 * forwards the status code upwards.
201 * This allows the main server (us) to generate
202 * the error page, (so it will look like a error
203 * returned from the rest of the system
205 int error_override:1;
207 int preserve_host_set:1;
208 int error_override_set:1;
212 /* if we interpolate env vars per-request, we'll need a per-request
213 * copy of the reverse proxy config
216 apr_array_header_t *raliases;
217 apr_array_header_t* cookie_paths;
218 apr_array_header_t* cookie_domains;
222 conn_rec *connection;
223 request_rec *r; /* Request record of the backend request
224 * that is used over the backend connection. */
225 proxy_worker *worker; /* Connection pool this connection belongs to */
226 apr_pool_t *pool; /* Subpool for hostname and addr data */
227 const char *hostname;
228 apr_sockaddr_t *addr; /* Preparsed remote address info */
229 apr_pool_t *scpool; /* Subpool used for socket and connection data */
230 apr_socket_t *sock; /* Connection socket */
231 void *data; /* per scheme connection data */
232 void *forward; /* opaque forward proxy data */
233 apr_uint32_t flags; /* Connection flags */
236 int close:1; /* Close 'this' connection */
237 int need_flush:1; /* Flag to decide whether we need to flush the
238 * filter chain or not */
239 int inreslist:1; /* connection in apr_reslist? */
243 float cache_completion; /* completion percentage */
244 int content_length; /* length of the content */
247 /* Connection pool */
248 struct proxy_conn_pool {
249 apr_pool_t *pool; /* The pool used in constructor and destructor calls */
250 apr_sockaddr_t *addr; /* Preparsed remote address info */
251 apr_reslist_t *res; /* Connection resource list */
252 proxy_conn_rec *conn; /* Single connection for prefork mpm */
255 /* worker status flags */
256 #define PROXY_WORKER_INITIALIZED 0x0001
257 #define PROXY_WORKER_IGNORE_ERRORS 0x0002
258 #define PROXY_WORKER_DRAIN 0x0004
259 #define PROXY_WORKER_IN_SHUTDOWN 0x0010
260 #define PROXY_WORKER_DISABLED 0x0020
261 #define PROXY_WORKER_STOPPED 0x0040
262 #define PROXY_WORKER_IN_ERROR 0x0080
263 #define PROXY_WORKER_HOT_STANDBY 0x0100
264 #define PROXY_WORKER_FREE 0x0200
266 #define PROXY_WORKER_NOT_USABLE_BITMAP ( PROXY_WORKER_IN_SHUTDOWN | \
267 PROXY_WORKER_DISABLED | PROXY_WORKER_STOPPED | PROXY_WORKER_IN_ERROR )
269 /* NOTE: these check the shared status */
270 #define PROXY_WORKER_IS_INITIALIZED(f) ( (f)->s->status & PROXY_WORKER_INITIALIZED )
272 #define PROXY_WORKER_IS_STANDBY(f) ( (f)->s->status & PROXY_WORKER_HOT_STANDBY )
274 #define PROXY_WORKER_IS_USABLE(f) ( ( !( (f)->s->status & PROXY_WORKER_NOT_USABLE_BITMAP) ) && \
275 PROXY_WORKER_IS_INITIALIZED(f) )
277 /* default worker retry timeout in seconds */
278 #define PROXY_WORKER_DEFAULT_RETRY 60
279 #define PROXY_WORKER_MAX_SCHEME_SIZE 16
280 #define PROXY_WORKER_MAX_ROUTE_SIZE 64
281 #define PROXY_WORKER_MAX_NAME_SIZE 96
283 #define PROXY_STRNCPY(dst, src) apr_cpystrn((dst), (src), sizeof(dst))
285 /* Runtime worker status informations. Shared in scoreboard */
287 char name[PROXY_WORKER_MAX_NAME_SIZE];
288 char scheme[PROXY_WORKER_MAX_SCHEME_SIZE]; /* scheme to use ajp|http|https */
289 char hostname[PROXY_WORKER_MAX_ROUTE_SIZE]; /* remote backend address */
290 char route[PROXY_WORKER_MAX_ROUTE_SIZE]; /* balancing route */
291 char redirect[PROXY_WORKER_MAX_ROUTE_SIZE]; /* temporary balancing redirection route */
292 char flusher[PROXY_WORKER_MAX_SCHEME_SIZE]; /* flush provider used by mod_proxy_fdpass */
293 int lbset; /* load balancer cluster set */
295 int retries; /* number of retries on this worker */
296 int lbstatus; /* Current lbstatus */
297 int lbfactor; /* dynamic lbfactor */
298 int min; /* Desired minimum number of available connections */
299 int smax; /* Soft maximum on the total number of connections */
300 int hmax; /* Hard maximum on the total number of connections */
301 int flush_wait; /* poll wait time in microseconds if flush_auto */
302 int index; /* shm array index */
303 unsigned int hash; /* hash of worker name */
308 } flush_packets; /* control AJP flushing */
309 apr_time_t error_time; /* time of the last error */
310 apr_interval_time_t ttl; /* maximum amount of time in seconds a connection
311 * may be available while exceeding the soft limit */
312 apr_interval_time_t retry; /* retry interval */
313 apr_interval_time_t timeout; /* connection timeout */
314 apr_interval_time_t acquire; /* acquire timeout when the maximum number of connections is exceeded */
315 apr_interval_time_t ping_timeout;
316 apr_interval_time_t conn_timeout;
317 apr_size_t recv_buffer_size;
318 apr_size_t io_buffer_size;
319 apr_size_t elected; /* Number of times the worker was elected */
320 apr_size_t busy; /* busyness factor */
322 apr_off_t transferred;/* Number of bytes transferred to remote */
323 apr_off_t read; /* Number of bytes read from remote */
324 void *context; /* general purpose storage */
325 unsigned int keepalive:1;
326 unsigned int disablereuse:1;
327 unsigned int is_address_reusable:1;
328 unsigned int retry_set:1;
329 unsigned int timeout_set:1;
330 unsigned int acquire_set:1;
331 unsigned int ping_timeout_set:1;
332 unsigned int conn_timeout_set:1;
333 unsigned int recv_buffer_size_set:1;
334 unsigned int io_buffer_size_set:1;
335 unsigned int keepalive_set:1;
336 unsigned int disablereuse_set:1;
337 } proxy_worker_shared;
339 #define ALIGNED_PROXY_WORKER_SHARED_SIZE (APR_ALIGN_DEFAULT(sizeof(proxy_worker_shared)))
341 /* Worker configuration */
342 struct proxy_worker {
343 int index; /* shm array index */
344 unsigned int hash; /* hash of worker name */
345 proxy_conn_pool *cp; /* Connection pool to use */
346 proxy_worker_shared *s; /* Shared data */
347 proxy_balancer *balancer; /* which balancer am I in? */
348 apr_thread_mutex_t *mutex; /* Thread lock for updating address cache */
349 int local_status; /* status of per-process worker */
350 void *context; /* general purpose storage */
354 * Time to wait (in microseconds) to find out if more data is currently
355 * available at the backend.
357 #define PROXY_FLUSH_WAIT 10000
359 struct proxy_balancer {
360 apr_array_header_t *workers; /* initially configured workers */
361 ap_slotmem_instance_t *slot; /* worker shm data - runtime */
362 int growth; /* number of post-config workers can added */
363 int max_workers; /* maximum number of allowed workers */
364 const char *name; /* name of the load balancer */
365 const char *sname; /* filesystem safe balancer name */
366 apr_interval_time_t timeout; /* Timeout for waiting on free connection */
367 const char *lbprovider; /* name of the lbmethod provider to use */
368 proxy_balancer_method *lbmethod;
370 const char *sticky_path; /* URL sticky session identifier */
371 apr_array_header_t *errstatuses; /* statuses to force members into error */
372 const char *sticky; /* sticky session identifier */
373 int max_attempts; /* Number of attempts before failing */
375 apr_time_t updated; /* timestamp of last update */
376 char nonce[APR_UUID_FORMATTED_LENGTH + 1];
377 apr_global_mutex_t *mutex; /* global lock for updating lb params */
378 void *context; /* general purpose storage */
379 int sticky_force:1; /* Disable failover for sticky sessions */
380 int scolonsep:1; /* true if ';' seps sticky session paths */
381 int max_attempts_set:1;
384 struct proxy_balancer_method {
385 const char *name; /* name of the load balancer method*/
386 proxy_worker *(*finder)(proxy_balancer *balancer,
388 void *context; /* general purpose storage */
389 apr_status_t (*reset)(proxy_balancer *balancer, server_rec *s);
390 apr_status_t (*age)(proxy_balancer *balancer, server_rec *s);
391 apr_status_t (*updatelbstatus)(proxy_balancer *balancer, proxy_worker *elected, server_rec *s);
394 #define PROXY_THREAD_LOCK(x) apr_thread_mutex_lock((x)->mutex)
395 #define PROXY_THREAD_UNLOCK(x) apr_thread_mutex_unlock((x)->mutex)
397 #define PROXY_GLOBAL_LOCK(x) apr_global_mutex_lock((x)->mutex)
398 #define PROXY_GLOBAL_UNLOCK(x) apr_global_mutex_unlock((x)->mutex)
402 /* Create a set of PROXY_DECLARE(type), PROXY_DECLARE_NONSTD(type) and
403 * PROXY_DECLARE_DATA with appropriate export and import tags for the platform
406 #define PROXY_DECLARE(type) type
407 #define PROXY_DECLARE_NONSTD(type) type
408 #define PROXY_DECLARE_DATA
409 #elif defined(PROXY_DECLARE_STATIC)
410 #define PROXY_DECLARE(type) type __stdcall
411 #define PROXY_DECLARE_NONSTD(type) type
412 #define PROXY_DECLARE_DATA
413 #elif defined(PROXY_DECLARE_EXPORT)
414 #define PROXY_DECLARE(type) __declspec(dllexport) type __stdcall
415 #define PROXY_DECLARE_NONSTD(type) __declspec(dllexport) type
416 #define PROXY_DECLARE_DATA __declspec(dllexport)
418 #define PROXY_DECLARE(type) __declspec(dllimport) type __stdcall
419 #define PROXY_DECLARE_NONSTD(type) __declspec(dllimport) type
420 #define PROXY_DECLARE_DATA __declspec(dllimport)
424 * Hook an optional proxy hook. Unlike static hooks, this uses a macro
425 * instead of a function.
427 #define PROXY_OPTIONAL_HOOK(name,fn,pre,succ,order) \
428 APR_OPTIONAL_HOOK(proxy,name,fn,pre,succ,order)
430 APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, scheme_handler, (request_rec *r,
431 proxy_worker *worker, proxy_server_conf *conf, char *url,
432 const char *proxyhost, apr_port_t proxyport))
433 APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, canon_handler, (request_rec *r,
436 APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, create_req, (request_rec *r, request_rec *pr))
437 APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, fixups, (request_rec *r))
441 * It will return the most suitable worker at the moment
442 * and coresponding balancer.
443 * The url is rewritten from balancer://cluster/uri to scheme://host:port/uri
444 * and then the scheme_handler is called.
447 APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, pre_request, (proxy_worker **worker,
448 proxy_balancer **balancer,
450 proxy_server_conf *conf, char **url))
453 * It is called after request for updating runtime balancer status.
455 APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, post_request, (proxy_worker *worker,
456 proxy_balancer *balancer, request_rec *r,
457 proxy_server_conf *conf))
460 * request status hook
461 * It is called after all proxy processing has been done. This gives other
462 * modules a chance to create default content on failure, for example
464 APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, request_status,
465 (int *status, request_rec *r))
469 PROXY_DECLARE(request_rec *)ap_proxy_make_fake_req(conn_rec *c, request_rec *r);
470 PROXY_DECLARE(int) ap_proxy_hex2c(const char *x);
471 PROXY_DECLARE(void) ap_proxy_c2hex(int ch, char *x);
472 PROXY_DECLARE(char *)ap_proxy_canonenc(apr_pool_t *p, const char *x, int len, enum enctype t,
473 int forcedec, int proxyreq);
474 PROXY_DECLARE(char *)ap_proxy_canon_netloc(apr_pool_t *p, char **const urlp, char **userp,
475 char **passwordp, char **hostp, apr_port_t *port);
476 PROXY_DECLARE(const char *)ap_proxy_date_canon(apr_pool_t *p, const char *x);
477 PROXY_DECLARE(int) ap_proxy_liststr(const char *list, const char *val);
478 PROXY_DECLARE(char *)ap_proxy_removestr(apr_pool_t *pool, const char *list, const char *val);
479 PROXY_DECLARE(int) ap_proxy_hex2sec(const char *x);
480 PROXY_DECLARE(void) ap_proxy_sec2hex(int t, char *y);
481 PROXY_DECLARE(int) ap_proxyerror(request_rec *r, int statuscode, const char *message);
482 PROXY_DECLARE(int) ap_proxy_is_ipaddr(struct dirconn_entry *This, apr_pool_t *p);
483 PROXY_DECLARE(int) ap_proxy_is_domainname(struct dirconn_entry *This, apr_pool_t *p);
484 PROXY_DECLARE(int) ap_proxy_is_hostname(struct dirconn_entry *This, apr_pool_t *p);
485 PROXY_DECLARE(int) ap_proxy_is_word(struct dirconn_entry *This, apr_pool_t *p);
486 PROXY_DECLARE(int) ap_proxy_checkproxyblock(request_rec *r, proxy_server_conf *conf, apr_sockaddr_t *uri_addr);
487 PROXY_DECLARE(int) ap_proxy_pre_http_request(conn_rec *c, request_rec *r);
488 PROXY_DECLARE(apr_status_t) ap_proxy_string_read(conn_rec *c, apr_bucket_brigade *bb, char *buff, size_t bufflen, int *eos);
489 PROXY_DECLARE(void) ap_proxy_table_unmerge(apr_pool_t *p, apr_table_t *t, char *key);
490 /* DEPRECATED (will be replaced with ap_proxy_connect_backend */
491 PROXY_DECLARE(int) ap_proxy_connect_to_backend(apr_socket_t **, const char *, apr_sockaddr_t *, const char *, proxy_server_conf *, request_rec *);
492 PROXY_DECLARE(apr_status_t) ap_proxy_ssl_connection_cleanup(proxy_conn_rec *conn,
494 PROXY_DECLARE(int) ap_proxy_ssl_enable(conn_rec *c);
495 PROXY_DECLARE(int) ap_proxy_ssl_disable(conn_rec *c);
496 PROXY_DECLARE(int) ap_proxy_conn_is_https(conn_rec *c);
497 PROXY_DECLARE(const char *) ap_proxy_ssl_val(apr_pool_t *p, server_rec *s, conn_rec *c, request_rec *r, const char *var);
499 /* Header mapping functions, and a typedef of their signature */
500 PROXY_DECLARE(const char *) ap_proxy_location_reverse_map(request_rec *r, proxy_dir_conf *conf, const char *url);
501 PROXY_DECLARE(const char *) ap_proxy_cookie_reverse_map(request_rec *r, proxy_dir_conf *conf, const char *str);
504 typedef const char *(*ap_proxy_header_reverse_map_fn)(request_rec *,
505 proxy_dir_conf *, const char *);
506 #elif defined(PROXY_DECLARE_STATIC)
507 typedef const char *(__stdcall *ap_proxy_header_reverse_map_fn)(request_rec *,
508 proxy_dir_conf *, const char *);
509 #elif defined(PROXY_DECLARE_EXPORT)
510 typedef __declspec(dllexport) const char *
511 (__stdcall *ap_proxy_header_reverse_map_fn)(request_rec *,
512 proxy_dir_conf *, const char *);
514 typedef __declspec(dllimport) const char *
515 (__stdcall *ap_proxy_header_reverse_map_fn)(request_rec *,
516 proxy_dir_conf *, const char *);
520 /* Connection pool API */
522 * Get the worker from proxy configuration
523 * @param p memory pool used for finding worker
524 * @param balancer the balancer that the worker belongs to
525 * @param conf current proxy server configuration
526 * @param url url to find the worker from
527 * @return proxy_worker or NULL if not found
529 PROXY_DECLARE(proxy_worker *) ap_proxy_get_worker(apr_pool_t *p,
530 proxy_balancer *balancer,
531 proxy_server_conf *conf,
534 * Define and Allocate space for the worker to proxy configuration
535 * @param p memory pool to allocate worker from
536 * @param worker the new worker
537 * @param balancer the balancer that the worker belongs to
538 * @param conf current proxy server configuration
539 * @param url url containing worker name
540 * @return error message or NULL if successful (*worker is new worker)
542 PROXY_DECLARE(char *) ap_proxy_define_worker(apr_pool_t *p,
543 proxy_worker **worker,
544 proxy_balancer *balancer,
545 proxy_server_conf *conf,
549 * Share a defined proxy worker via shm
550 * @param worker worker to be shared
551 * @param shm location of shared info
552 * @param i index into shm
553 * @return APR_SUCCESS or error code
555 PROXY_DECLARE(apr_status_t) ap_proxy_share_worker(proxy_worker *worker, proxy_worker_shared *shm, int i);
558 * Initialize the worker by setting up worker connection pool and mutex
559 * @param worker worker to initialize
560 * @param s current server record
561 * @param p memory pool used for mutex and connection pool
562 * @return APR_SUCCESS or error code
564 PROXY_DECLARE(apr_status_t) ap_proxy_initialize_worker(proxy_worker *worker,
569 * Verifies valid balancer name (eg: balancer://foo)
570 * @param name name to test
571 * @param i number of chars to test; 0 for all.
574 PROXY_DECLARE(int) ap_proxy_valid_balancer_name(char *name, int i);
578 * Get the balancer from proxy configuration
579 * @param p memory pool used for temporary storage while finding balancer
580 * @param conf current proxy server configuration
581 * @param url url to find the worker from; must have balancer:// prefix
582 * @return proxy_balancer or NULL if not found
584 PROXY_DECLARE(proxy_balancer *) ap_proxy_get_balancer(apr_pool_t *p,
585 proxy_server_conf *conf,
589 * Define and Allocate space for the balancer to proxy configuration
590 * @param p memory pool to allocate balancer from
591 * @param balancer the new balancer
592 * @param conf current proxy server configuration
593 * @param url url containing balancer name
594 * @return error message or NULL if successfull
596 PROXY_DECLARE(char *) ap_proxy_define_balancer(apr_pool_t *p,
597 proxy_balancer **balancer,
598 proxy_server_conf *conf,
602 * Get the most suitable worker and/or balancer for the request
603 * @param worker worker used for processing request
604 * @param balancer balancer used for processing request
605 * @param r current request
606 * @param conf current proxy server configuration
607 * @param url request url that balancer can rewrite.
608 * @return OK or HTTP_XXX error
609 * @note It calls balancer pre_request hook if the url starts with balancer://
610 * The balancer then rewrites the url to particular worker, like http://host:port
612 PROXY_DECLARE(int) ap_proxy_pre_request(proxy_worker **worker,
613 proxy_balancer **balancer,
615 proxy_server_conf *conf,
618 * Post request worker and balancer cleanup
619 * @param worker worker used for processing request
620 * @param balancer balancer used for processing request
621 * @param r current request
622 * @param conf current proxy server configuration
623 * @return OK or HTTP_XXX error
624 * @note Whenever the pre_request is called, the post_request has to be
627 PROXY_DECLARE(int) ap_proxy_post_request(proxy_worker *worker,
628 proxy_balancer *balancer,
630 proxy_server_conf *conf);
633 * Request status function
634 * @param status status of proxy request (result)
635 * @param r the request to obtain the status for
636 * @return OK or DECLINED
638 PROXY_DECLARE(int) ap_proxy_request_status(int *status, request_rec *r);
641 * Determine backend hostname and port
642 * @param p memory pool used for processing
643 * @param r current request
644 * @param conf current proxy server configuration
645 * @param worker worker used for processing request
646 * @param conn proxy connection struct
647 * @param uri processed uri
648 * @param url request url
649 * @param proxyname are we connecting directly or via a proxy
650 * @param proxyport proxy host port
651 * @param server_portstr Via headers server port
652 * @param server_portstr_size size of the server_portstr buffer
653 * @return OK or HTTP_XXX error
655 PROXY_DECLARE(int) ap_proxy_determine_connection(apr_pool_t *p, request_rec *r,
656 proxy_server_conf *conf,
657 proxy_worker *worker,
658 proxy_conn_rec *conn,
661 const char *proxyname,
662 apr_port_t proxyport,
663 char *server_portstr,
664 int server_portstr_size);
667 * Mark a worker for retry
668 * @param proxy_function calling proxy scheme (http, ajp, ...)
669 * @param worker worker used for retrying
670 * @param s current server record
671 * @return OK if marked for retry, DECLINED otherwise
672 * @note The error status of the worker will cleared if the retry interval has
673 * elapsed since the last error.
675 PROXY_DECLARE(int) ap_proxy_retry_worker(const char *proxy_function,
676 proxy_worker *worker,
680 * Acquire a connection from worker connection pool
681 * @param proxy_function calling proxy scheme (http, ajp, ...)
682 * @param conn acquired connection
683 * @param worker worker used for obtaining connection
684 * @param s current server record
685 * @return OK or HTTP_XXX error
686 * @note If the connection limit has been reached, the function will
687 * block until a connection becomes available or the timeout has
690 PROXY_DECLARE(int) ap_proxy_acquire_connection(const char *proxy_function,
691 proxy_conn_rec **conn,
692 proxy_worker *worker,
695 * Release a connection back to worker connection pool
696 * @param proxy_function calling proxy scheme (http, ajp, ...)
697 * @param conn acquired connection
698 * @param s current server record
699 * @return OK or HTTP_XXX error
700 * @note The connection will be closed if conn->close_on_release is set
702 PROXY_DECLARE(int) ap_proxy_release_connection(const char *proxy_function,
703 proxy_conn_rec *conn,
706 * Make a connection to the backend
707 * @param proxy_function calling proxy scheme (http, ajp, ...)
708 * @param conn acquired connection
709 * @param worker connection worker
710 * @param s current server record
711 * @return OK or HTTP_XXX error
712 * @note In case the socket already exists for conn, just check the link
715 PROXY_DECLARE(int) ap_proxy_connect_backend(const char *proxy_function,
716 proxy_conn_rec *conn,
717 proxy_worker *worker,
720 * Make a connection record for backend connection
721 * @param proxy_function calling proxy scheme (http, ajp, ...)
722 * @param conn acquired connection
723 * @param c client connection record
724 * @param s current server record
725 * @return OK or HTTP_XXX error
726 * @note The function will return immediately if conn->connection
729 PROXY_DECLARE(int) ap_proxy_connection_create(const char *proxy_function,
730 proxy_conn_rec *conn,
731 conn_rec *c, server_rec *s);
733 * Signal the upstream chain that the connection to the backend broke in the
734 * middle of the response. This is done by sending an error bucket with
735 * status HTTP_BAD_GATEWAY and an EOS bucket up the filter chain.
736 * @param r current request record of client request
737 * @param brigade The brigade that is sent through the output filter chain
739 PROXY_DECLARE(void) ap_proxy_backend_broke(request_rec *r,
740 apr_bucket_brigade *brigade);
743 * Transform buckets from one bucket allocator to another one by creating a
744 * transient bucket for each data bucket and let it use the data read from
745 * the old bucket. Metabuckets are transformed by just recreating them.
746 * Attention: Currently only the following bucket types are handled:
752 * If an other bucket type is found its type is logged as a debug message
753 * and APR_EGENERAL is returned.
754 * @param r current request record of client request. Only used for logging
756 * @param from the brigade that contains the buckets to transform
757 * @param to the brigade that will receive the transformed buckets
758 * @return APR_SUCCESS if all buckets could be transformed APR_EGENERAL
761 PROXY_DECLARE(apr_status_t)
762 ap_proxy_buckets_lifetime_transform(request_rec *r, apr_bucket_brigade *from,
763 apr_bucket_brigade *to);
765 * Return a hash based on the passed string
766 * @param str string to produce hash from
767 * @param method hashing method to use
768 * @return hash as unsigned int
771 typedef enum { PROXY_HASHFUNC_DEFAULT, PROXY_HASHFUNC_APR, PROXY_HASHFUNC_FNV } proxy_hash_t;
773 PROXY_DECLARE(unsigned int)
774 ap_proxy_hashfunc(const char *str, proxy_hash_t method);
776 #define PROXY_LBMETHOD "proxylbmethod"
778 /* The number of dynamic workers that can be added when reconfiguring.
779 * If this limit is reached you must stop and restart the server.
781 #define PROXY_DYNAMIC_BALANCER_LIMIT 16
784 * Calculate maximum number of workers in scoreboard.
785 * @return number of workers to allocate in the scoreboard
787 int ap_proxy_lb_workers(void);
790 extern module PROXY_DECLARE_DATA proxy_module;
792 extern int PROXY_DECLARE_DATA proxy_lb_workers;
794 #endif /*MOD_PROXY_H*/