1 /* Copyright 1999-2004 The Apache Software Foundation
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
20 * Main include file for the Apache proxy
25 Also note numerous FIXMEs and CHECKMEs which should be eliminated.
27 This code is once again experimental!
31 1. Make it completely work (for FTP too)
35 Chuck Murcko <chuck@topsail.org> 02-06-01
41 #include "apr_hooks.h"
44 #include "apr_strings.h"
45 #include "apr_buckets.h"
47 #include "apr_network_io.h"
48 #include "apr_pools.h"
49 #include "apr_strings.h"
52 #include "apr_strmatch.h"
53 #include "apr_fnmatch.h"
54 #include "apr_reslist.h"
55 #define APR_WANT_STRFUNC
59 #include "http_config.h"
60 #include "ap_config.h"
61 #include "http_core.h"
62 #include "http_protocol.h"
63 #include "http_request.h"
64 #include "http_vhost.h"
65 #include "http_main.h"
67 #include "http_connection.h"
68 #include "util_filter.h"
69 #include "util_ebcdic.h"
71 #if APR_HAVE_NETINET_IN_H
72 #include <netinet/in.h>
74 #if APR_HAVE_ARPA_INET_H
75 #include <arpa/inet.h>
78 /* for proxy_canonenc() */
80 enc_path, enc_search, enc_user, enc_fpath, enc_parm
83 #if APR_CHARSET_EBCDIC
85 #else /*APR_CHARSET_EBCDIC*/
86 #define CRLF "\015\012"
87 #endif /*APR_CHARSET_EBCDIC*/
89 /* default Max-Forwards header setting */
90 #define DEFAULT_MAX_FORWARDS 10
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 apr_port_t port; /* the port for this proxy */
98 regex_t *regexp; /* compiled regex (if any) for the remote */
99 int use_regex; /* simple boolean. True if we have a regex pattern */
107 struct dirconn_entry {
109 struct in_addr addr, mask;
110 struct apr_sockaddr_t *hostaddr;
111 int (*matcher) (struct dirconn_entry * This, request_rec *r);
114 struct noproxy_entry {
116 struct apr_sockaddr_t *addr;
120 apr_array_header_t *proxies;
121 apr_array_header_t *sec_proxy;
122 apr_array_header_t *aliases;
123 apr_array_header_t *raliases;
124 apr_array_header_t *noproxies;
125 apr_array_header_t *dirconn;
126 apr_array_header_t *allowed_connect_ports;
127 apr_array_header_t *workers;
128 apr_array_header_t *balancers;
129 const char *domain; /* domain name to use in absence of a domain name in the request */
130 int req; /* true if proxy requests are enabled */
137 } viaopt; /* how to deal with proxy Via: headers */
139 apr_size_t recv_buffer_size;
140 char recv_buffer_size_set;
141 apr_size_t io_buffer_size;
142 char io_buffer_size_set;
146 * the following setting masks the error page
147 * returned from the 'proxied server' and just
148 * forwards the status code upwards.
149 * This allows the main server (us) to generate
150 * the error page, (so it will look like a error
151 * returned from the rest of the system
154 int error_override_set;
156 int preserve_host_set;
157 apr_interval_time_t timeout;
158 apr_interval_time_t timeout_set;
163 } badopt; /* how to deal with bad headers */
165 /* putting new stuff on the end maximises binary back-compatibility.
166 * the strmatch_patterns are really a const just to have a
167 * case-independent strstr.
169 apr_array_header_t* cookie_paths;
170 apr_array_header_t* cookie_domains;
171 const apr_strmatch_pattern* cookie_path_str;
172 const apr_strmatch_pattern* cookie_domain_str;
177 const char *p; /* The path */
178 int p_is_fnmatch; /* Is this path an fnmatch candidate? */
179 regex_t *r; /* Is this a regex? */
183 conn_rec *connection;
190 float cache_completion; /* completion percentage */
191 int content_length; /* length of the content */
194 /* Physical connection to the backend server */
196 apr_pool_t *pool; /* Subpool used for creating socket */
198 int close; /* Close 'this' connection */
201 /* Connection pool */
203 apr_pool_t *pool; /* The pool used in constructor and destructor calls */
204 apr_sockaddr_t *addr; /* Preparsed remote address info */
206 apr_reslist_t *res; /* Connection resource list */
208 proxy_conn *conn; /* Single connection for prefork mpm's */
212 /* Worker configuration */
215 apr_time_t error_time; /* time of the last error */
216 apr_interval_time_t retry; /* retry interval */
217 int retries; /* number of retries on this worker */
218 int lbfactor; /* initial load balancing factor */
220 const char *scheme; /* scheme to use ajp|http|https */
221 const char *hostname; /* remote backend address */
223 int min; /* Desired minimum number of available connections */
224 int smax; /* Soft maximum on the total number of connections */
225 int hmax; /* Hard maximum on the total number of connections */
226 apr_interval_time_t ttl; /* maximum amount of time in seconds a connection
227 * may be available while exceeding the soft limit */
228 proxy_conn_pool *cp; /* Connection pool to use */
229 void *opaque; /* per scheme worker data */
232 /* Runtime worker status informations. Shared in scoreboard */
235 double lbfactor; /* dynamic lbfactor */
236 double lbsatus; /* Current lbstatus */
237 apr_size_t transfered; /* Number of bytes transfered to remote */
238 apr_size_t readed; /* Number of bytes readed from remote */
239 } proxy_runtime_worker;
241 struct proxy_balancer {
242 apr_array_header_t *workers; /* array of proxy_runtime_workers */
243 const char *name; /* name of the load balancer */
244 const char *sticky; /* sticky session identifier */
245 int sticky_force; /* Disable failover for sticky sessions */
246 apr_interval_time_t timeout; /* Timeout for waiting on free connection */
248 apr_thread_mutex_t *mutex; /* Thread lock for updating lb params */
252 /* per connection data structure for set/get module_config */
254 char *url; /* rewtitten url */
255 struct proxy_balancer *balancer; /* load balancer to use */
256 proxy_worker *worker; /* most suitable worker */
257 proxy_conn_rec *conn_rec;
259 void *opaque; /* module private data */
264 /* Create a set of PROXY_DECLARE(type), PROXY_DECLARE_NONSTD(type) and
265 * PROXY_DECLARE_DATA with appropriate export and import tags for the platform
268 #define PROXY_DECLARE(type) type
269 #define PROXY_DECLARE_NONSTD(type) type
270 #define PROXY_DECLARE_DATA
271 #elif defined(PROXY_DECLARE_STATIC)
272 #define PROXY_DECLARE(type) type __stdcall
273 #define PROXY_DECLARE_NONSTD(type) type
274 #define PROXY_DECLARE_DATA
275 #elif defined(PROXY_DECLARE_EXPORT)
276 #define PROXY_DECLARE(type) __declspec(dllexport) type __stdcall
277 #define PROXY_DECLARE_NONSTD(type) __declspec(dllexport) type
278 #define PROXY_DECLARE_DATA __declspec(dllexport)
280 #define PROXY_DECLARE(type) __declspec(dllimport) type __stdcall
281 #define PROXY_DECLARE_NONSTD(type) __declspec(dllimport) type
282 #define PROXY_DECLARE_DATA __declspec(dllimport)
286 * Hook an optional proxy hook. Unlike static hooks, this uses a macro
287 * instead of a function.
289 #define PROXY_OPTIONAL_HOOK(name,fn,pre,succ,order) \
290 APR_OPTIONAL_HOOK(proxy,name,fn,pre,succ,order)
292 APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, scheme_handler, (request_rec *r,
293 proxy_server_conf *conf, char *url,
294 const char *proxyhost, apr_port_t proxyport))
295 APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, canon_handler, (request_rec *r,
298 APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, create_req, (request_rec *r, request_rec *pr))
299 APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, fixups, (request_rec *r))
303 * It will return the most suitable worker at the moment
304 * and coresponding balancer.
305 * The url is rewritten from balancer://cluster/uri to scheme://host:port/uri
306 * and then the scheme_handler is called.
309 APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, pre_request, (proxy_worker **worker,
310 struct proxy_balancer **balancer,
312 proxy_server_conf *conf, char **url))
315 * It is called after request for updating runtime balancer status.
317 APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, post_request, (proxy_worker *worker,
318 struct proxy_balancer *balancer, request_rec *r,
319 proxy_server_conf *conf))
324 PROXY_DECLARE(request_rec *)ap_proxy_make_fake_req(conn_rec *c, request_rec *r);
325 PROXY_DECLARE(int) ap_proxy_hex2c(const char *x);
326 PROXY_DECLARE(void) ap_proxy_c2hex(int ch, char *x);
327 PROXY_DECLARE(char *)ap_proxy_canonenc(apr_pool_t *p, const char *x, int len, enum enctype t,
329 PROXY_DECLARE(char *)ap_proxy_canon_netloc(apr_pool_t *p, char **const urlp, char **userp,
330 char **passwordp, char **hostp, apr_port_t *port);
331 PROXY_DECLARE(const char *)ap_proxy_date_canon(apr_pool_t *p, const char *x);
332 PROXY_DECLARE(int) ap_proxy_liststr(const char *list, const char *val);
333 PROXY_DECLARE(char *)ap_proxy_removestr(apr_pool_t *pool, const char *list, const char *val);
334 PROXY_DECLARE(int) ap_proxy_hex2sec(const char *x);
335 PROXY_DECLARE(void) ap_proxy_sec2hex(int t, char *y);
336 PROXY_DECLARE(int) ap_proxyerror(request_rec *r, int statuscode, const char *message);
337 PROXY_DECLARE(int) ap_proxy_is_ipaddr(struct dirconn_entry *This, apr_pool_t *p);
338 PROXY_DECLARE(int) ap_proxy_is_domainname(struct dirconn_entry *This, apr_pool_t *p);
339 PROXY_DECLARE(int) ap_proxy_is_hostname(struct dirconn_entry *This, apr_pool_t *p);
340 PROXY_DECLARE(int) ap_proxy_is_word(struct dirconn_entry *This, apr_pool_t *p);
341 PROXY_DECLARE(int) ap_proxy_checkproxyblock(request_rec *r, proxy_server_conf *conf, apr_sockaddr_t *uri_addr);
342 PROXY_DECLARE(int) ap_proxy_pre_http_request(conn_rec *c, request_rec *r);
343 PROXY_DECLARE(apr_status_t) ap_proxy_string_read(conn_rec *c, apr_bucket_brigade *bb, char *buff, size_t bufflen, int *eos);
344 PROXY_DECLARE(void) ap_proxy_table_unmerge(apr_pool_t *p, apr_table_t *t, char *key);
345 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 *);
346 PROXY_DECLARE(int) ap_proxy_ssl_enable(conn_rec *c);
347 PROXY_DECLARE(int) ap_proxy_ssl_disable(conn_rec *c);
349 /* Connection pool API */
350 PROXY_DECLARE(proxy_worker *) ap_proxy_get_worker(apr_pool_t *p, proxy_server_conf *conf, const char *url);
351 PROXY_DECLARE(const char *) ap_proxy_add_worker(proxy_worker **worker, apr_pool_t *p, proxy_server_conf *conf, const char *url);
352 PROXY_DECLARE(struct proxy_balancer *) ap_proxy_get_balancer(apr_pool_t *p, proxy_server_conf *conf, const char *url);
353 PROXY_DECLARE(const char *) ap_proxy_add_balancer(struct proxy_balancer **balancer, apr_pool_t *p, proxy_server_conf *conf, const char *url);
354 PROXY_DECLARE(void) ap_proxy_add_worker_to_balancer(struct proxy_balancer *balancer, proxy_worker *worker);
355 PROXY_DECLARE(int) ap_proxy_pre_request(proxy_worker **worker, struct proxy_balancer **balancer, request_rec *r, proxy_server_conf *conf, char **url);
358 extern module PROXY_DECLARE_DATA proxy_module;
360 #endif /*MOD_PROXY_H*/