#ifndef FILTERS_H_INCLUDED #define FILTERS_H_INCLUDED #define FILTERS_H_VERSION "$Id: filters.h,v 1.35 2008/05/03 16:40:45 fabiankeil 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', `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, 2004 the SourceForge * Privoxy team. http://www.privoxy.org/ * * 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 1.35 2008/05/03 16:40:45 fabiankeil * Change content_filters_enabled()'s parameter from * csp->action to action so it can be also used in the * CGI code. Don't bother checking if there are filters * loaded, as that's somewhat besides the point. * * Revision 1.34 2008/03/02 12:25:25 fabiankeil * Also use shiny new connect_port_is_forbidden() in jcc.c. * * Revision 1.33 2008/02/23 16:57:12 fabiankeil * Rename url_actions() to get_url_actions() and let it * use the standard parameter ordering. * * Revision 1.32 2008/02/23 16:33:43 fabiankeil * Let forward_url() use the standard parameter ordering * and mark its second parameter immutable. * * Revision 1.31 2007/10/19 16:53:28 fabiankeil * Add helper function to check if any content filters are enabled. * * Revision 1.30 2007/09/29 10:21:16 fabiankeil * - Move get_filter_function() from jcc.c to filters.c * so the filter functions can be static. * - Don't bother filtering body-less responses. * * Revision 1.29 2007/09/28 16:38:55 fabiankeil * - Execute content filters through execute_content_filter(). * - Add prepare_for_filtering() so filter functions don't have to * care about de-chunking and decompression. As a side effect this enables * decompression for gif_deanimate_response() and jpeg_inspect_response(). * - Change remove_chunked_transfer_coding()'s return type to jb_err. * Some clowns feel like chunking empty responses in which case * (size == 0) is valid but previously would be interpreted as error. * * Revision 1.28 2007/09/02 15:31:20 fabiankeil * Move match_portlist() from filter.c to urlmatch.c. * It's used for url matching, not for filtering. * * Revision 1.27 2007/04/30 15:02:18 fabiankeil * Introduce dynamic pcrs jobs that can resolve variables. * * Revision 1.26 2007/03/13 11:28:43 fabiankeil * - Fix port handling in acl_addr() and use a temporary acl spec * copy so error messages don't contain a truncated version. * - Log size of iob before and after decompression. * * Revision 1.25 2007/01/12 15:36:44 fabiankeil * Mark *csp as immutable for is_untrusted_url() * and is_imageurl(). Closes FR 1237736. * * Revision 1.24 2006/12/29 18:30:46 fabiankeil * Fixed gcc43 conversion warnings, * changed sprintf calls to snprintf. * * Revision 1.23 2006/11/28 15:19:43 fabiankeil * Implemented +redirect{s@foo@bar@} to generate * a redirect based on a rewritten version of the * original URL. * * Revision 1.22 2006/07/18 14:48:46 david__schmidt * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch) * with what was really the latest development (the v_3_0_branch branch) * * Revision 1.20.2.2 2004/10/03 12:53:32 david__schmidt * Add the ability to check jpeg images for invalid * lengths of comment blocks. Defensive strategy * against the exploit: * Microsoft Security Bulletin MS04-028 * Buffer Overrun in JPEG Processing (GDI+) Could * Allow Code Execution (833987) * Enabled with +inspect-jpegs in actions files. * * Revision 1.20.2.1 2002/09/25 14:51:51 oes * Added basic support for OPTIONS and TRACE HTTP methods: * New function direct_response which handles OPTIONS and * TRACE requests whose Max-Forwards header field is zero. * * Revision 1.20 2002/04/02 14:56:16 oes * Bugfix: is_untrusted_url() and trust_url() now depend on FEATURE_TRUST, not FEATURE_COOKIE_JAR * * Revision 1.19 2002/03/26 22:29:54 swa * we have a new homepage! * * Revision 1.18 2002/03/25 22:12:45 oes * Added fix for undefined INADDR_NONE on Solaris by Bart Schelstraete * * Revision 1.17 2002/03/24 13:25:43 swa * name change related issues * * Revision 1.16 2002/01/17 21:01:02 jongfoster * Moving all our URL and URL pattern parsing code to urlmatch.c. * * Revision 1.15 2001/10/10 16:44:16 oes * Added match_portlist function * * Revision 1.14 2001/10/07 15:41:40 oes * Added prototype for remove_chunked_transfer_coding * * Revision 1.13 2001/07/30 22:08:36 jongfoster * Tidying up #defines: * - All feature #defines are now of the form FEATURE_xxx * - Permanently turned off WIN_GUI_EDIT * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS * * 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(const struct access_control_addr *dst, const struct client_state *csp); extern int acl_addr(const 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_TRUST extern struct http_response *trust_url(struct client_state *csp); #endif /* def FEATURE_TRUST */ /* * Request inspectors */ #ifdef FEATURE_TRUST extern int is_untrusted_url(const struct client_state *csp); #endif /* def FEATURE_TRUST */ #ifdef FEATURE_IMAGE_BLOCKING extern int is_imageurl(const struct client_state *csp); #endif /* def FEATURE_IMAGE_BLOCKING */ extern int connect_port_is_forbidden(const struct client_state *csp); /* * Determining applicable actions */ extern void get_url_actions(struct client_state *csp, struct http_request *http); 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 client_state *csp, const struct http_request *http); /* * Content modification */ typedef char *(*filter_function_ptr)(); extern char *execute_content_filter(struct client_state *csp, filter_function_ptr content_filter); extern filter_function_ptr get_filter_function(struct client_state *csp); extern char *execute_single_pcrs_command(char *subject, const char *pcrs_command, int *hits); extern char *rewrite_url(char *old_url, const char *pcrs_command); extern char *get_last_url(char *subject, const char *redirect_mode); extern pcrs_job *compile_dynamic_pcrs_job_list(const struct client_state *csp, const struct re_filterfile_spec *b); extern int content_filters_enabled(const struct current_action_spec *action); /* * Handling Max-Forwards: */ extern struct http_response *direct_response(struct client_state *csp); /* * Solaris fix: */ #ifndef INADDR_NONE #define INADDR_NONE -1 #endif /* * 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: */