filters.h

   1 #ifndef FILTERS_H_INCLUDED
   2 #define FILTERS_H_INCLUDED
   3 /*********************************************************************
   4  *
   5  * File        :  $Source: /cvsroot/ijbswa/current/filters.h,v $
   6  *
   7  * Purpose     :  Declares functions to parse/crunch headers and pages.
   8  *
   9  * Copyright   :  Written by and Copyright (C) 2001-2010 the
  10  *                Privoxy team. https://www.privoxy.org/
  11  *
  12  *                Based on the Internet Junkbuster originally written
  13  *                by and Copyright (C) 1997 Anonymous Coders and
  14  *                Junkbusters Corporation.  http://www.junkbusters.com
  15  *
  16  *                This program is free software; you can redistribute it
  17  *                and/or modify it under the terms of the GNU General
  18  *                Public License as published by the Free Software
  19  *                Foundation; either version 2 of the License, or (at
  20  *                your option) any later version.
  21  *
  22  *                This program is distributed in the hope that it will
  23  *                be useful, but WITHOUT ANY WARRANTY; without even the
  24  *                implied warranty of MERCHANTABILITY or FITNESS FOR A
  25  *                PARTICULAR PURPOSE.  See the GNU General Public
  26  *                License for more details.
  27  *
  28  *                The GNU General Public License should be included with
  29  *                this file.  If not, you can view it at
  30  *                http://www.gnu.org/copyleft/gpl.html
  31  *                or write to the Free Software Foundation, Inc., 59
  32  *                Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  33  *
  34  *********************************************************************/
  35
  36
  37 #include "project.h"
  38
  39 /*
  40  * ACL checking
  41  */
  42 #ifdef FEATURE_ACL
  43 extern int block_acl(const struct access_control_addr *dst, const struct client_state *csp);
  44 extern int acl_addr(const char *aspec, struct access_control_addr *aca);
  45 #endif /* def FEATURE_ACL */
  46
  47 /*
  48  * Interceptors
  49  */
  50 extern struct http_response *block_url(struct client_state *csp);
  51 extern struct http_response *redirect_url(struct client_state *csp);
  52 #ifdef FEATURE_TRUST
  53 extern struct http_response *trust_url(struct client_state *csp);
  54 #endif /* def FEATURE_TRUST */
  55
  56 /*
  57  * Request inspectors
  58  */
  59 #ifdef FEATURE_TRUST
  60 extern int is_untrusted_url(const struct client_state *csp);
  61 #endif /* def FEATURE_TRUST */
  62 #ifdef FEATURE_IMAGE_BLOCKING
  63 extern int is_imageurl(const struct client_state *csp);
  64 #endif /* def FEATURE_IMAGE_BLOCKING */
  65 extern int connect_port_is_forbidden(const struct client_state *csp);
  66
  67 /*
  68  * Determining applicable actions
  69  */
  70 extern void get_url_actions(struct client_state *csp,
  71                             struct http_request *http);
  72
  73 extern struct re_filterfile_spec *get_filter(const struct client_state *csp,
  74                                              const char *requested_name,
  75                                              enum filter_type requested_type);
  76
  77 /*
  78  * Determining parent proxies
  79  */
  80 extern const struct forward_spec *forward_url(struct client_state *csp,
  81                                               const struct http_request *http);
  82
  83 /*
  84  * Content modification
  85  */
  86 extern char *execute_content_filters(struct client_state *csp);
  87 extern int execute_client_body_filters(struct client_state *csp, size_t *content_length);
  88 extern jb_err execute_client_body_taggers(struct client_state *csp, size_t content_length);
  89 extern char *execute_single_pcrs_command(char *subject, const char *pcrs_command, int *hits);
  90 extern char *rewrite_url(char *old_url, const char *pcrs_command);
  91
  92 extern pcrs_job *compile_dynamic_pcrs_job_list(const struct client_state *csp, const struct re_filterfile_spec *b);
  93
  94 extern int content_requires_filtering(struct client_state *csp);
  95 extern int content_filters_enabled(const struct current_action_spec *action);
  96 extern int client_body_filters_enabled(const struct current_action_spec *action);
  97 extern int client_body_taggers_enabled(const struct current_action_spec *action);
  98 extern int filters_available(const struct client_state *csp);
  99
 100 /*
 101  * Handling Max-Forwards:
 102  */
 103 extern struct http_response *direct_response(struct client_state *csp);
 104
 105 extern int get_bytes_missing_from_chunked_data(char *buffer, size_t size, size_t offset);
 106 extern int chunked_data_is_complete(char *buffer, size_t size, size_t offset);
 107
 108 #ifdef FUZZ
 109 extern char *gif_deanimate_response(struct client_state *csp);
 110 extern jb_err remove_chunked_transfer_coding(char *buffer, size_t *size);
 111 #endif
 112
 113 #ifdef FEATURE_EXTENDED_STATISTICS
 114 extern void register_filter_for_statistics(const char *filter);
 115 extern void update_filter_statistics(const char *filter, int hits);
 116 extern void get_filter_statistics(const char *filter,
 117                                   unsigned long long *executions,
 118                                   unsigned long long *pages_modified,
 119                                   unsigned long long *hits);
 120
 121 extern void register_block_reason_for_statistics(const char *block_reason);
 122 extern void get_block_reason_count(const char *block_reason,
 123                                    unsigned long long *count);
 124 #endif
 125
 126 #endif /* ndef FILTERS_H_INCLUDED */
 127
 128 /*
 129   Local Variables:
 130   tab-width: 3
 131   end:
 132 */