#ifndef FILTERS_H_INCLUDED #define FILTERS_H_INCLUDED #define FILTERS_H_VERSION "$Id: filters.h,v 1.12 2001/07/29 19:01:11 jongfoster Exp $" /********************************************************************* * * File : $Source: /cvsroot/ijbswa/current/filters.h,v $ * * Purpose : Declares functions to parse/crunch headers and pages. * Functions declared include: * `acl_addr', `add_stats', `block_acl', `block_imageurl', * `block_url', `url_actions', `domaincmp', `dsplit', * `filter_popups', `forward_url' * `ij_untrusted_url', `intercept_url', `re_process_buffer', * `show_proxy_args', and `trust_url' * * Copyright : Written by and Copyright (C) 2001 the SourceForge * IJBSWA team. http://ijbswa.sourceforge.net * * Based on the Internet Junkbuster originally written * by and Copyright (C) 1997 Anonymous Coders and * Junkbusters Corporation. http://www.junkbusters.com * * This program is free software; you can redistribute it * and/or modify it under the terms of the GNU General * Public License as published by the Free Software * Foundation; either version 2 of the License, or (at * your option) any later version. * * This program is distributed in the hope that it will * be useful, but WITHOUT ANY WARRANTY; without even the * implied warranty of MERCHANTABILITY or FITNESS FOR A * PARTICULAR PURPOSE. See the GNU General Public * License for more details. * * The GNU General Public License should be included with * this file. If not, you can view it at * http://www.gnu.org/copyleft/gpl.html * or write to the Free Software Foundation, Inc., 59 * Temple Place - Suite 330, Boston, MA 02111-1307, USA. * * Revisions : * $Log: filters.h,v $ * Revision 1.12 2001/07/29 19:01:11 jongfoster * Changed _FILENAME_H to FILENAME_H_INCLUDED. * Added forward declarations for needed structures. * * Revision 1.11 2001/07/13 14:00:18 oes * - Introduced gif_deanimate_response * - Renamed re_process_buffer to pcrs_filter_response * - Removed all #ifdef PCRS * * Revision 1.10 2001/06/29 13:29:01 oes * Cleaned up and updated to reflect the changesin * filters.c * * Revision 1.9 2001/06/07 23:10:53 jongfoster * Replacing struct gateway with struct forward_spec * * Revision 1.8 2001/06/03 19:12:00 oes * extracted-CGI relevant stuff * * Revision 1.7 2001/05/31 21:21:30 jongfoster * Permissionsfile / actions file changes: * - Changed "permission" to "action" throughout * - changes to file format to allow string parameters * - Moved helper functions to actions.c * * Revision 1.6 2001/05/29 09:50:24 jongfoster * Unified blocklist/imagelist/permissionslist. * File format is still under discussion, but the internal changes * are (mostly) done. * * Also modified interceptor behaviour: * - We now intercept all URLs beginning with one of the following * prefixes (and *only* these prefixes): * * http://i.j.b/ * * http://ijbswa.sf.net/config/ * * http://ijbswa.sourceforge.net/config/ * - New interceptors "home page" - go to http://i.j.b/ to see it. * - Internal changes so that intercepted and fast redirect pages * are not replaced with an image. * - Interceptors now have the option to send a binary page direct * to the client. (i.e. ijb-send-banner uses this) * - Implemented show-url-info interceptor. (Which is why I needed * the above interceptors changes - a typical URL is * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif". * The previous mechanism would not have intercepted that, and * if it had been intercepted then it then it would have replaced * it with an image.) * * Revision 1.5 2001/05/27 22:17:04 oes * * - re_process_buffer no longer writes the modified buffer * to the client, which was very ugly. It now returns the * buffer, which it is then written by chat. * * - content_length now adjusts the Content-Length: header * for modified documents rather than crunch()ing it. * (Length info in csp->content_length, which is 0 for * unmodified documents) * * - For this to work, sed() is called twice when filtering. * * Revision 1.4 2001/05/26 15:26:15 jongfoster * ACL feature now provides more security by immediately dropping * connections from untrusted hosts. * * Revision 1.3 2001/05/22 18:46:04 oes * * - Enabled filtering banners by size rather than URL * by adding patterns that replace all standard banner * sizes with the "Junkbuster" gif to the re_filterfile * * - Enabled filtering WebBugs by providing a pattern * which kills all 1x1 images * * - Added support for PCRE_UNGREEDY behaviour to pcrs, * which is selected by the (nonstandard and therefore * capital) letter 'U' in the option string. * It causes the quantifiers to be ungreedy by default. * Appending a ? turns back to greedy (!). * * - Added a new interceptor ijb-send-banner, which * sends back the "Junkbuster" gif. Without imagelist or * MSIE detection support, or if tinygif = 1, or the * URL isn't recognized as an imageurl, a lame HTML * explanation is sent instead. * * - Added new feature, which permits blocking remote * script redirects and firing back a local redirect * to the browser. * The feature is conditionally compiled, i.e. it * can be disabled with --disable-fast-redirects, * plus it must be activated by a "fast-redirects" * line in the config file, has its own log level * and of course wants to be displayed by show-proxy-args * Note: Boy, all the #ifdefs in 1001 locations and * all the fumbling with configure.in and acconfig.h * were *way* more work than the feature itself :-( * * - Because a generic redirect template was needed for * this, tinygif = 3 now uses the same. * * - Moved GIFs, and other static HTTP response templates * to project.h * * - Some minor fixes * * - Removed some >400 CRs again (Jon, you really worked * a lot! ;-) * * Revision 1.2 2001/05/20 01:21:20 jongfoster * Version 2.9.4 checkin. * - Merged popupfile and cookiefile, and added control over PCRS * filtering, in new "permissionsfile". * - Implemented LOG_LEVEL_FATAL, so that if there is a configuration * file error you now get a message box (in the Win32 GUI) rather * than the program exiting with no explanation. * - Made killpopup use the PCRS MIME-type checking and HTTP-header * skipping. * - Removed tabs from "config" * - Moved duplicated url parsing code in "loaders.c" to a new funcition. * - Bumped up version number. * * Revision 1.1.1.1 2001/05/15 13:58:52 oes * Initial import of version 2.9.3 source tree * * *********************************************************************/ #include "project.h" #ifdef __cplusplus extern "C" { #endif struct access_control_addr; struct client_state; struct http_request; struct http_response; struct current_action_spec; struct url_actions; struct url_spec; /* * ACL checking */ #ifdef FEATURE_ACL extern int block_acl(struct access_control_addr *dst, struct client_state *csp); extern int acl_addr(char *aspec, struct access_control_addr *aca); #endif /* def FEATURE_ACL */ /* * Interceptors */ extern struct http_response *block_url(struct client_state *csp); extern struct http_response *redirect_url(struct client_state *csp); #ifdef FEATURE_COOKIE_JAR extern struct http_response *trust_url(struct client_state *csp); #endif /* def FEATURE_COOKIE_JAR */ /* * Request inspectors */ #ifdef FEATURE_COOKIE_JAR extern int is_untrusted_url(struct client_state *csp); #endif /* def FEATURE_COOKIE_JAR */ #ifdef FEATURE_IMAGE_BLOCKING extern int is_imageurl(struct client_state *csp); #endif /* def FEATURE_IMAGE_BLOCKING */ /* * Determining applicable actions */ extern void url_actions(struct http_request *http, struct client_state *csp); extern void apply_url_actions(struct current_action_spec *action, struct http_request *http, struct url_actions *b); /* * Determining parent proxies */ extern const struct forward_spec *forward_url(struct http_request *http, struct client_state *csp); extern struct url_spec dsplit(char *domain); extern int domaincmp(struct url_spec *pattern, struct url_spec *fqdn); /* * Content modification */ extern char *pcrs_filter_response(struct client_state *csp); extern char *gif_deanimate_response(struct client_state *csp); /* * Revision control strings from this header and associated .c file */ extern const char filters_rcs[]; extern const char filters_h_rcs[]; #ifdef __cplusplus } /* extern "C" */ #endif #endif /* ndef FILTERS_H_INCLUDED */ /* Local Variables: tab-width: 3 end: */