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- /* ====================================================================
- * Copyright (c) 1996-1999 The Apache Group. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 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. All advertising materials mentioning features or use of this
- * software must display the following acknowledgment:
- * "This product includes software developed by the Apache Group
- * for use in the Apache HTTP server project (http://www.apache.org/)."
- *
- * 4. The names "Apache Server" and "Apache Group" 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 names without prior written
- * permission of the Apache Group.
- *
- * 6. Redistributions of any form whatsoever must retain the following
- * acknowledgment:
- * "This product includes software developed by the Apache Group
- * for use in the Apache HTTP server project (http://www.apache.org/)."
- *
- * THIS SOFTWARE IS PROVIDED BY THE APACHE GROUP ``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 GROUP 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 Group and was originally based
- * on public domain software written at the National Center for
- * Supercomputing Applications, University of Illinois, Urbana-Champaign.
- * For more information on the Apache Group and the Apache HTTP server
- * project, please see <http://www.apache.org/>.
- *
- */
-
- #ifndef MOD_PROXY_H
- #define MOD_PROXY_H
-
- /*
- * Main include file for the Apache proxy
- */
-
- /*
-
- Note that the Explain() stuff is not yet complete.
- Also note numerous FIXMEs and CHECKMEs which should be eliminated.
-
- If TESTING is set, then garbage collection doesn't delete ... probably a good
- idea when hacking.
-
- This code is still experimental!
-
- Things to do:
-
- 1. Make it garbage collect in the background, not while someone is waiting for
- a response!
-
- 2. Check the logic thoroughly.
-
- 3. Empty directories are only removed the next time round (but this does avoid
- two passes). Consider doing them the first time round.
-
- Ben Laurie <ben@algroup.co.uk> 30 Mar 96
-
- More things to do:
-
- 0. Code cleanup (ongoing)
-
- 1. add 230 response output for ftp now that it works
-
- 2. Make the ftp proxy transparent, also same with (future) gopher & wais
-
- 3. Use protocol handler struct a la Apache module handlers (Dirk van Gulik)
-
- 4. Use a cache expiry database for more efficient GC (Jeremy Wohl)
-
- 5. Bulletproof GC against SIGALRM
-
- Chuck Murcko <chuck@topsail.org> 15 April 1997
-
- */
-
- #define TESTING 0
- #undef EXPLAIN
-
- #include "httpd.h"
- #include "http_config.h"
- #include "http_protocol.h"
-
- #include "explain.h"
-
- extern module MODULE_VAR_EXPORT proxy_module;
-
-
- /* for proxy_canonenc() */
- enum enctype {
- enc_path, enc_search, enc_user, enc_fpath, enc_parm
- };
-
- #define HDR_APP (0) /* append header, for proxy_add_header() */
- #define HDR_REP (1) /* replace header, for proxy_add_header() */
-
- /* number of characters in the hash */
- #define HASH_LEN (22*2)
-
- /* maximum 'CacheDirLevels*CacheDirLength' value */
- #define CACHEFILE_LEN 20 /* must be less than HASH_LEN/2 */
-
- #ifdef CHARSET_EBCDIC
- #define CRLF "\r\n"
- #else /*CHARSET_EBCDIC*/
- #define CRLF "\015\012"
- #endif /*CHARSET_EBCDIC*/
-
-
- #define SEC_ONE_DAY 86400 /* one day, in seconds */
- #define SEC_ONE_HR 3600 /* one hour, in seconds */
-
- #define DEFAULT_FTP_DATA_PORT 20
- #define DEFAULT_FTP_PORT 21
- #define DEFAULT_GOPHER_PORT 70
- #define DEFAULT_NNTP_PORT 119
- #define DEFAULT_WAIS_PORT 210
- #define DEFAULT_HTTPS_PORT 443
- #define DEFAULT_SNEWS_PORT 563
- #define DEFAULT_PROSPERO_PORT 1525 /* WARNING: conflict w/Oracle */
-
- /* Some WWW schemes and their default ports; this is basically /etc/services */
- struct proxy_services {
- const char *scheme;
- int port;
- };
-
- /* 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 */
- int port; /* the port for this proxy */
- };
-
- struct proxy_alias {
- char *real;
- char *fake;
- };
-
- struct dirconn_entry {
- char *name;
- struct in_addr addr, mask;
- struct hostent *hostentry;
- int (*matcher) (struct dirconn_entry * This, request_rec *r);
- };
-
- struct noproxy_entry {
- char *name;
- struct in_addr addr;
- };
-
- struct nocache_entry {
- char *name;
- struct in_addr addr;
- };
-
- #define DEFAULT_CACHE_SPACE 5
- #define DEFAULT_CACHE_MAXEXPIRE SEC_ONE_DAY
- #define DEFAULT_CACHE_EXPIRE SEC_ONE_HR
- #define DEFAULT_CACHE_LMFACTOR (0.1)
- #define DEFAULT_CACHE_COMPLETION (0.9)
-
- /* static information about the local cache */
- struct cache_conf {
- const char *root; /* the location of the cache directory */
- off_t space; /* Maximum cache size (in 1024 bytes) */
- time_t maxexpire; /* Maximum time to keep cached files in secs */
- time_t defaultexpire; /* default time to keep cached file in secs */
- double lmfactor; /* factor for estimating expires date */
- time_t gcinterval; /* garbage collection interval, in seconds */
- int dirlevels; /* Number of levels of subdirectories */
- int dirlength; /* Length of subdirectory names */
- float cache_completion; /* Force cache completion after this point */
- };
-
- typedef struct {
- struct cache_conf cache; /* cache configuration */
- array_header *proxies;
- array_header *aliases;
- array_header *raliases;
- array_header *noproxies;
- array_header *dirconn;
- array_header *nocaches;
- array_header *allowed_connect_ports;
- char *domain; /* domain name to use in absence of a domain name in the request */
- int req; /* true if proxy requests are enabled */
- enum {
- via_off,
- via_on,
- via_block,
- via_full
- } viaopt; /* how to deal with proxy Via: headers */
- size_t recv_buffer_size;
- } proxy_server_conf;
-
- struct hdr_entry {
- const char *field;
- const char *value;
- };
-
- /* caching information about a request */
- typedef struct {
- request_rec *req; /* the request */
- char *url; /* the URL requested */
- char *filename; /* name of the cache file, or NULL if no cache */
- char *tempfile; /* name of the temporary file, of NULL if not caching */
- time_t ims; /* if-modified-since date of request; -1 if no header */
- BUFF *fp; /* the cache file descriptor if the file is cached
- and may be returned, or NULL if the file is
- not cached (or must be reloaded) */
- time_t expire; /* calculated expire date of cached entity */
- time_t lmod; /* last-modified date of cached entity */
- time_t date; /* the date the cached file was last touched */
- int version; /* update count of the file */
- off_t len; /* content length */
- char *protocol; /* Protocol, and major/minor number, e.g. HTTP/1.1 */
- int status; /* the status of the cached file */
- unsigned int written; /* total *content* bytes written to cache */
- float cache_completion; /* specific to this request */
- char *resp_line; /* the whole status like (protocol, code + message) */
- table *hdrs; /* the HTTP headers of the file */
- } cache_req;
-
- /* Additional information passed to the function called by ap_table_do() */
- struct tbl_do_args {
- request_rec *req;
- cache_req *cache;
- };
-
- /* Function prototypes */
-
- /* proxy_cache.c */
-
- void ap_proxy_cache_tidy(cache_req *c);
- int ap_proxy_cache_check(request_rec *r, char *url, struct cache_conf *conf,
- cache_req **cr);
- int ap_proxy_cache_update(cache_req *c, table *resp_hdrs,
- const int is_HTTP1, int nocache);
- void ap_proxy_garbage_coll(request_rec *r);
-
- /* proxy_connect.c */
-
- int ap_proxy_connect_handler(request_rec *r, cache_req *c, char *url,
- const char *proxyhost, int proxyport);
-
- /* proxy_ftp.c */
-
- int ap_proxy_ftp_canon(request_rec *r, char *url);
- int ap_proxy_ftp_handler(request_rec *r, cache_req *c, char *url);
-
- /* proxy_http.c */
-
- int ap_proxy_http_canon(request_rec *r, char *url, const char *scheme,
- int def_port);
- int ap_proxy_http_handler(request_rec *r, cache_req *c, char *url,
- const char *proxyhost, int proxyport);
-
- /* proxy_util.c */
-
- int ap_proxy_hex2c(const char *x);
- void ap_proxy_c2hex(int ch, char *x);
- char *ap_proxy_canonenc(pool *p, const char *x, int len, enum enctype t,
- int isenc);
- char *ap_proxy_canon_netloc(pool *p, char **const urlp, char **userp,
- char **passwordp, char **hostp, int *port);
- const char *ap_proxy_date_canon(pool *p, const char *x);
- table *ap_proxy_read_headers(request_rec *r, char *buffer, int size, BUFF *f);
- long int ap_proxy_send_fb(BUFF *f, request_rec *r, cache_req *c);
- void ap_proxy_send_headers(request_rec *r, const char *respline, table *hdrs);
- int ap_proxy_liststr(const char *list, const char *val);
- void ap_proxy_hash(const char *it, char *val, int ndepth, int nlength);
- int ap_proxy_hex2sec(const char *x);
- void ap_proxy_sec2hex(int t, char *y);
- cache_req *ap_proxy_cache_error(cache_req *r);
- int ap_proxyerror(request_rec *r, const char *message);
- const char *ap_proxy_host2addr(const char *host, struct hostent *reqhp);
- int ap_proxy_is_ipaddr(struct dirconn_entry *This, pool *p);
- int ap_proxy_is_domainname(struct dirconn_entry *This, pool *p);
- int ap_proxy_is_hostname(struct dirconn_entry *This, pool *p);
- int ap_proxy_is_word(struct dirconn_entry *This, pool *p);
- int ap_proxy_doconnect(int sock, struct sockaddr_in *addr, request_rec *r);
- int ap_proxy_garbage_init(server_rec *, pool *);
- /* This function is called by ap_table_do() for all header lines */
- int ap_proxy_send_hdr_line(void *p, const char *key, const char *value);
- unsigned ap_proxy_bputs2(const char *data, BUFF *client, cache_req *cache);
-
- #endif /*MOD_PROXY_H*/
-