const char cgi_rcs[] = "$Id: cgi.c,v 1.112 2008/08/31 16:08:12 fabiankeil Exp $"; /********************************************************************* * * File : $Source: /cvsroot/ijbswa/current/cgi.c,v $ * * Purpose : Declares functions to intercept request, generate * html or gif answers, and to compose HTTP resonses. * This only contains the framework functions, the * actual handler functions are declared elsewhere. * * Functions declared include: * * * Copyright : Written by and Copyright (C) 2001-2004, 2006-2008 * 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: cgi.c,v $ * Revision 1.112 2008/08/31 16:08:12 fabiankeil * "View the request headers" isn't more equal than the other * menu items and thus doesn't need a trailing dot either. * * Revision 1.111 2008/08/31 15:59:02 fabiankeil * There's no reason to let remote toggling support depend * on FEATURE_CGI_EDIT_ACTIONS, so make sure it doesn't. * * Revision 1.110 2008/08/31 14:55:43 fabiankeil * Add a @date@ symbol to include a date(1)-like time string * in templates. Modified version of the patch Endre Szabo * submitted in #2026468. * * Revision 1.109 2008/07/26 09:40:27 fabiankeil * Remove the unconditional block in get_http_time(). * It's pointless now that it's no longer used to limit * dummy's scope. While at it, remove obvious comments * and a trailing space. * * Revision 1.108 2008/05/26 17:30:53 fabiankeil * Provide an OpenSearch Description to access the * show-url-info page through "search engine plugins". * * Revision 1.107 2008/05/26 16:23:19 fabiankeil * - Fix spelling in template-not-found message. * - Declare referrer_is_safe()'s alternative_prefix[] static. * * Revision 1.106 2008/05/21 15:24:38 fabiankeil * Mark csp as immutable for a bunch of functions. * * Revision 1.105 2008/04/17 14:40:47 fabiankeil * Provide get_http_time() with the buffer size so it doesn't * have to blindly assume that the buffer is big enough. * * Revision 1.104 2008/03/26 18:07:06 fabiankeil * Add hostname directive. Closes PR#1918189. * * Revision 1.103 2008/03/21 11:13:57 fabiankeil * Only gather host information if it's actually needed. * Also move the code out of accept_connection() so it's less likely * to delay other incoming connections if the host is misconfigured. * * Revision 1.102 2008/02/23 16:33:43 fabiankeil * Let forward_url() use the standard parameter ordering * and mark its second parameter immutable. * * Revision 1.101 2008/02/03 15:45:06 fabiankeil * Add SOCKS5 support for "Forwarding failure" CGI page. * * Revision 1.100 2007/10/17 18:40:53 fabiankeil * - Send CGI pages as HTTP/1.1 unless the client asked for HTTP/1.0. * - White space fix. * * Revision 1.99 2007/08/05 13:42:22 fabiankeil * #1763173 from Stefan Huehner: declare some more functions static. * * Revision 1.98 2007/05/14 10:33:51 fabiankeil * - Use strlcpy() and strlcat() instead of strcpy() and strcat(). * * Revision 1.97 2007/04/09 18:11:35 fabiankeil * Don't mistake VC++'s _snprintf() for a snprintf() replacement. * * Revision 1.96 2007/03/08 17:41:05 fabiankeil * Use sizeof() more often. * * Revision 1.95 2007/02/10 17:01:37 fabiankeil * Don't overlook map result for the forwarding-type. * * Revision 1.94 2007/02/08 19:44:49 fabiankeil * Use a transparent background for the PNG replacement pattern. * * Revision 1.93 2007/02/07 10:45:22 fabiankeil * - Save the reason for generating http_responses. * - Fix --disable-toggle (again). * - Use TBL birthday hack for 403 responses as well. * - Uglify the @menu@ again to fix JavaScript * errors on the "blocked" template. * - Escape an ampersand in cgi_error_unknown(). * * Revision 1.92 2007/01/28 13:41:17 fabiankeil * - Add HEAD support to finish_http_response. * - Add error favicon to internal HTML error messages. * * Revision 1.91 2007/01/27 13:09:16 fabiankeil * Add new config option "templdir" to * change the templates directory. * * Revision 1.90 2007/01/25 13:47:26 fabiankeil * Added "forwarding-failed" template support for error_response(). * * Revision 1.89 2007/01/23 15:51:16 fabiankeil * Add favicon delivery functions. * * Revision 1.88 2007/01/23 13:14:32 fabiankeil * - Map variables that aren't guaranteed to be * pure ASCII html_encoded. * - Use CGI_PREFIX to generate URL for user manual * CGI page to make sure CGI_SITE_2_PATH is included. * * Revision 1.87 2007/01/22 15:34:13 fabiankeil * - "Protect" against a rather lame JavaScript-based * Privoxy detection "attack" and check the referrer * before delivering the CGI style sheet. * - Move referrer check for unsafe CGI pages into * referrer_is_safe() and log the result. * - Map @url@ in cgi-error-disabled page. * It's required for the "go there anyway" link. * - Mark *csp as immutable for grep_cgi_referrer(). * * Revision 1.86 2007/01/09 11:54:26 fabiankeil * Fix strdup() error handling in cgi_error_unknown() * and cgi_error_no_template(). Reported by Markus Elfring. * * Revision 1.85 2007/01/05 14:19:02 fabiankeil * Handle pcrs_execute() errors in template_fill() properly. * * Revision 1.84 2006/12/28 17:54:22 fabiankeil * Fixed gcc43 conversion warnings and replaced sprintf * calls with snprintf to give OpenBSD's gcc one less reason * to complain. * * Revision 1.83 2006/12/17 19:35:19 fabiankeil * Escape ampersand in Privoxy menu. * * Revision 1.82 2006/12/17 17:53:39 fabiankeil * Suppress the toggle link if remote toggling is disabled. * * Revision 1.81 2006/12/09 13:49:16 fabiankeil * Fix configure option --disable-toggle. * Thanks to Peter Thoenen for reporting this. * * Revision 1.80 2006/12/08 14:45:32 fabiankeil * Don't lose the FORCE_PREFIX in case of * connection problems. Fixes #612235. * * Revision 1.79 2006/11/13 19:05:50 fabiankeil * Make pthread mutex locking more generic. Instead of * checking for OSX and OpenBSD, check for FEATURE_PTHREAD * and use mutex locking unless there is an _r function * available. Better safe than sorry. * * Fixes "./configure --disable-pthread" and should result * in less threading-related problems on pthread-using platforms, * but it still doesn't fix BR#1122404. * * Revision 1.78 2006/09/21 19:22:07 fabiankeil * Use CGI_PREFIX to check the referrer. * The check for "http://config.privoxy.org/" fails * if the user modified CGI_SITE_2_HOST. * * Revision 1.77 2006/09/21 15:17:23 fabiankeil * Adjusted headers for Privoxy's cgi responses: * Don't set Last-Modified, Expires and Cache-Control * headers for redirects; always set "Connection: close". * * Revision 1.76 2006/09/07 14:06:38 fabiankeil * Only predate the Last-Modified header for cgi responses * that are delivered with status code 404 or 503. * * Revision 1.75 2006/09/07 11:56:39 fabiankeil * Mark cgi_send_user_manual as harmless, * to fix the access denied problem Hal spotted. * The manual has no secret content, therefore we * don't have to care about "secure" referrers. * * Revision 1.74 2006/09/06 18:45:03 fabiankeil * Incorporate modified version of Roland Rosenfeld's patch to * optionally access the user-manual via Privoxy. Closes patch 679075. * * Formatting changed to Privoxy style, added call to * cgi_error_no_template if the requested file doesn't * exist and modified check whether or not Privoxy itself * should serve the manual. Should work cross-platform now. * * Revision 1.73 2006/08/03 02:46:41 david__schmidt * Incorporate Fabian Keil's patch work: http://www.fabiankeil.de/sourcecode/privoxy/ * * Revision 1.72 2006/07/18 14:48:45 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 1.70.2.13 2004/02/17 13:30:23 oes * Moved cgi_error_disabled() from cgiedit.c to * cgi.c to re-enable build with --disable-editor. * Fixes Bug #892744. Thanks to Matthew Fischer * for spotting. * * Revision 1.70.2.12 2003/12/17 16:33:16 oes * - Added new function cgi_redirect to handle creation of * HTTP redirect messages formerly repeated in the code. * - Send cgi_error_disabled instead of cgi_error_404 when * referrer check fails * - Dynamic content now gets Expires header field with date * in the past * * Revision 1.70.2.11 2003/10/23 12:29:26 oes * Bugfix: Transparent PNG was not transparent. Thanks to * Dan Razzell of Starfish Systems for notice and new PNG. * * Revision 1.70.2.10 2003/06/06 07:54:25 oes * Security fix: dspatch_known_cgi no longer considers an empty * referrer safe for critical CGIs, since malicious links could * reside on https:// locations which browsers don't advertize as * referrers. Closes bug #749916, thanks to Jeff Epler for the * hint. Goodbye One-Click[tm] toggling :-( * * Revision 1.70.2.9 2003/05/08 15:11:31 oes * Nit * * Revision 1.70.2.8 2003/04/29 13:33:51 oes * Killed a compiler warning on OSX * * Revision 1.70.2.7 2003/04/03 13:50:58 oes * - Don't call cgi_error_disabled ifndef FEATURE_CGI_EDIT_ACTIONS * (fixes bug #710056) * - Show toggle info only if we have it * * Revision 1.70.2.6 2003/03/12 01:26:25 david__schmidt * Move declaration of struct tm dummy outside of a control block so it is * accessible later on during snprintf in get_http_time. * * Revision 1.70.2.5 2003/03/11 11:53:58 oes * Cosmetic: Renamed cryptic variable * * Revision 1.70.2.4 2003/03/07 03:41:03 david__schmidt * Wrapping all *_r functions (the non-_r versions of them) with mutex semaphores for OSX. Hopefully this will take care of all of those pesky crash reports. * * Revision 1.70.2.3 2002/11/28 18:14:32 oes * Disable access to critical CGIs via untrusted referrers. * This prevents users from being tricked by malicious websites * into making unintentional configuration changes: * * - Added flag to each cgi_dispatcher that allows or denies * external linking * - Introduced proviorical function that greps for the * referrer header before regular header parsing happens * - Added safety check to dispatch_known_cgi. CGI is called * if (cgi harmless || no referrer || we are referrer). * Else a) toggle calls are modified not to change status and * b) all other calls are denied. * * Revision 1.70.2.2 2002/11/12 16:20:37 oes * Added missing #ifdef FEATURE_TOGGLE around g_bToggleIJB; fixes bug #636651 * * Revision 1.70.2.1 2002/08/05 11:17:46 oes * Fixed Bug #587820, i.e. added workaround for IE bug that includes fragment identifier in (cgi) query * * Revision 1.70 2002/05/19 11:33:20 jongfoster * If a CGI error was not handled, and propogated back to * dispatch_known_cgi(), then it was assumed to be "out of memory". * This gave a very misleading error message. * * Now other errors will cause a simple message giving the error * number and asking the user to report a bug. * * Bug report: * http://sourceforge.net/tracker/index.php?func=detail * &aid=557905&group_id=11118&atid=111118 * * Revision 1.69 2002/05/14 21:28:40 oes * - Fixed add_help_link to link to the (now split) actions * part of the config chapter * - Renamed helplink export to actions-help-prefix * * Revision 1.68 2002/05/12 21:36:29 jongfoster * Correcting function comments * * Revision 1.67 2002/04/30 12:02:07 oes * Nit: updated a comment * * Revision 1.66 2002/04/26 18:32:57 jongfoster * Fixing a memory leak on error * * Revision 1.65 2002/04/26 12:53:51 oes * - New function add_help_link * - default_exports now exports links to the user manual * and a prefix for links into the config chapter * * Revision 1.64 2002/04/24 02:17:21 oes * - Better descriptions for CGIs * - Hide edit-actions, more shortcuts * - Moved get_char_param, get_string_param and get_number_param here * from cgiedit.c * * Revision 1.63 2002/04/15 19:06:43 jongfoster * Typos * * Revision 1.62 2002/04/10 19:59:46 jongfoster * Fixes to #include in templates: * - Didn't close main file if loading an included template fails. * - I'm paranoid and want to disallow "#include /etc/passwd". * * Revision 1.61 2002/04/10 13:37:48 oes * Made templates modular: template_load now recursive with max depth 1 * * Revision 1.60 2002/04/08 20:50:25 swa * fixed JB spelling * * Revision 1.59 2002/04/05 15:51:51 oes * - added send-stylesheet CGI * - bugfix: error-pages now get correct request protocol * - fixed * - kludged CGI descriptions and menu not to break JS syntax * * Revision 1.58 2002/03/29 03:33:13 david__schmidt * Fix Mac OSX compiler warnings * * Revision 1.57 2002/03/26 22:29:54 swa * we have a new homepage! * * Revision 1.56 2002/03/24 17:50:46 jongfoster * Fixing compile error if actions file editor disabled * * Revision 1.55 2002/03/24 16:55:06 oes * Making GIF checkerboard transparent * * Revision 1.54 2002/03/24 16:18:15 jongfoster * Removing old logo * * Revision 1.53 2002/03/24 16:06:00 oes * Correct transparency for checkerboard PNG. Thanks, Magnus! * * Revision 1.52 2002/03/24 15:23:33 jongfoster * Name changes * * Revision 1.51 2002/03/24 13:25:43 swa * name change related issues * * Revision 1.50 2002/03/16 23:54:06 jongfoster * Adding graceful termination feature, to help look for memory leaks. * If you enable this (which, by design, has to be done by hand * editing config.h) and then go to http://i.j.b/die, then the program * will exit cleanly after the *next* request. It should free all the * memory that was used. * * Revision 1.49 2002/03/13 00:27:04 jongfoster * Killing warnings * * Revision 1.48 2002/03/08 17:47:07 jongfoster * Adding comments * * Revision 1.47 2002/03/08 16:41:33 oes * Added GIF images again * * Revision 1.46 2002/03/07 03:48:38 oes * - Changed built-in images from GIF to PNG * (with regard to Unisys patent issue) * - Added a 4x4 pattern PNG which is less intrusive * than the logo but also clearly marks the deleted banners * * Revision 1.45 2002/03/06 22:54:35 jongfoster * Automated function-comment nitpicking. * * Revision 1.44 2002/03/05 22:43:45 david__schmidt * - Better error reporting on OS/2 * - Fix double-slash comment (oops) * * Revision 1.43 2002/03/05 21:33:45 david__schmidt * - Re-enable OS/2 building after new parms were added * - Fix false out of memory report when resolving CGI templates when no IP * address is available of failed attempt (a la no such domain) * * Revision 1.42 2002/01/21 00:33:20 jongfoster * Replacing strsav() with the safer string_append() or string_join(). * Adding map_block_keep() to save a few bytes in the edit-actions-list HTML. * Adding missing html_encode() to error message generators. * Adding edit-actions-section-swap and many "shortcuts" to the list of CGIs. * * Revision 1.41 2002/01/17 20:56:22 jongfoster * Replacing hard references to the URL of the config interface * with #defines from project.h * * Revision 1.40 2002/01/09 14:26:46 oes * Added support for thread-safe gmtime_r call. * * Revision 1.39 2001/11/16 00:48:13 jongfoster * Fixing a compiler warning * * Revision 1.38 2001/11/13 00:31:21 jongfoster * - Adding new CGIs for use by non-JavaScript browsers: * edit-actions-url-form * edit-actions-add-url-form * edit-actions-remove-url-form * - Fixing make_menu()'s HTML generation - it now quotes the href parameter. * - Fixing || bug. * * Revision 1.37 2001/11/01 14:28:47 david__schmidt * Show enablement/disablement status in almost all templates. * There is a little trickiness here: apparent recursive resolution of * @if-enabled-then@ caused the toggle template to show status out-of-phase with * the actual enablement status. So a similar construct, * @if-enabled-display-then@, is used to resolve the status display on non-'toggle' * templates. * * Revision 1.36 2001/10/26 17:33:27 oes * marginal bugfix * * Revision 1.35 2001/10/23 21:48:19 jongfoster * Cleaning up error handling in CGI functions - they now send back * a HTML error page and should never cause a FATAL error. (Fixes one * potential source of "denial of service" attacks). * * CGI actions file editor that works and is actually useful. * * Ability to toggle Junkbuster remotely using a CGI call. * * You can turn off both the above features in the main configuration * file, e.g. if you are running a multi-user proxy. * * Revision 1.34 2001/10/18 22:22:09 david__schmidt * Only show "Local support" on templates conditionally: * - if either 'admin-address' or 'proxy-info-url' are uncommented in config * - if not, no Local support section appears * * Revision 1.33 2001/10/14 22:28:41 jongfoster * Fixing stupid typo. * * Revision 1.32 2001/10/14 22:20:18 jongfoster * - Changes to CGI dispatching method to match CGI names exactly, * rather than doing a prefix match. * - No longer need to count the length of the CGI handler names by hand. * - Adding new handler for 404 error when disptching a CGI, if none of * the handlers match. * - Adding new handlers for CGI actionsfile editor. * * Revision 1.31 2001/10/10 10:56:39 oes * Failiure to load template now fatal. Before, the user got a hard-to-understand assertion failure from cgi.c * * Revision 1.30 2001/10/02 15:30:57 oes * Introduced show-request cgi * * Revision 1.29 2001/09/20 15:47:44 steudten * * Fix BUG: Modify int size to size_t size in fill_template() * - removes big trouble on machines where sizeof(int) != sizeof(size_t). * * Revision 1.28 2001/09/19 18:00:37 oes * - Deletef time() FIXME (Can't fail under Linux either, if * the argument is guaranteed to be in out address space, * which it is.) * - Fixed comments * - Pointer notation cosmetics * - Fixed a minor bug in template_fill(): Failiure of * pcrs_execute() now secure. * * Revision 1.27 2001/09/16 17:08:54 jongfoster * Moving simple CGI functions from cgi.c to new file cgisimple.c * * Revision 1.26 2001/09/16 15:47:37 jongfoster * First version of CGI-based edit interface. This is very much a * work-in-progress, and you can't actually use it to edit anything * yet. You must #define FEATURE_CGI_EDIT_ACTIONS for these changes * to have any effect. * * Revision 1.25 2001/09/16 15:02:35 jongfoster * Adding i.j.b/robots.txt. * Inlining add_stats() since it's only ever called from one place. * * Revision 1.24 2001/09/16 11:38:01 jongfoster * Splitting fill_template() into 2 functions: * template_load() loads the file * template_fill() performs the PCRS regexps. * This is because the CGI edit interface has a "table row" * template which is used many times in the page - this * change means it's only loaded from disk once. * * Revision 1.23 2001/09/16 11:16:05 jongfoster * Better error handling in dispatch_cgi() and parse_cgi_parameters() * * Revision 1.22 2001/09/16 11:00:10 jongfoster * New function alloc_http_response, for symmetry with free_http_response * * Revision 1.21 2001/09/13 23:53:03 jongfoster * Support for both static and dynamically generated CGI pages. * Correctly setting Last-Modified: and Expires: HTTP headers. * * Revision 1.20 2001/09/13 23:40:36 jongfoster * (Cosmetic only) Indentation correction * * Revision 1.19 2001/09/13 23:31:25 jongfoster * Moving image data to cgi.c rather than cgi.h. * * Revision 1.18 2001/08/05 16:06:20 jongfoster * Modifiying "struct map" so that there are now separate header and * "map_entry" structures. This means that functions which modify a * map no longer need to return a pointer to the modified map. * Also, it no longer reverses the order of the entries (which may be * important with some advanced template substitutions). * * Revision 1.17 2001/08/05 15:57:38 oes * Adapted finish_http_response to new list_to_text * * Revision 1.16 2001/08/01 21:33:18 jongfoster * Changes to fill_template() that reduce memory usage without having * an impact on performance. I also renamed some variables so as not * to clash with the C++ keywords "new" and "template". * * Revision 1.15 2001/08/01 21:19:22 jongfoster * Moving file version information to a separate CGI page. * * Revision 1.14 2001/08/01 00:19:03 jongfoster * New function: map_conditional() for an if-then-else syntax. * Changing to use new version of show_defines() * * 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 18:47:05 jongfoster * Adding missing #include "loadcfg.h" * * Revision 1.11 2001/07/18 17:24:37 oes * Changed to conform to new pcrs interface * * Revision 1.10 2001/07/13 13:53:13 oes * Removed all #ifdef PCRS and related code * * Revision 1.9 2001/06/29 21:45:41 oes * Indentation, CRLF->LF, Tab-> Space * * Revision 1.8 2001/06/29 13:21:46 oes * - Cosmetics: renamed and reordered functions, variables, * texts, improved comments etc * * - Removed ij_untrusted_url() The relevant * info is now part of the "untrusted" page, * which is generated by filters.c:trust_url() * * - Generators of content now call finish_http_response() * themselves, making jcc.c:chat() a little less * cluttered * * - Removed obsolete "Pragma: no-cache" from our headers * * - http_responses now know their head length * * - fill_template now uses the new interface to pcrs, so that * - long jobs (like whole files) no longer have to be assembled * in a fixed size buffer * - the new T (trivial) option is used, and the replacement may * contain Perl syntax backrefs without confusing pcrs * * - Introduced default_exports() which generates a set of exports * common to all CGIs and other content generators * * - Introduced convenience function map_block_killer() * * - Introduced convenience function make_menu() * * - Introduced CGI-like function error_response() which generates * the "No such domain" and "Connect failed" messages using the * CGI platform * * - cgi_show_url_info: * - adapted to new CGI features * - form and answers now generated from same template * - http:// prefix in URL now OK * * - cgi_show_status: * - adapted to new CGI features * - no longer uses csp->init_proxy_args * * - cgi_default: * - moved menu generation to make_menu() * * - add_stats now writes single export map entries instead * of a fixed string * * - Moved redirect_url() to filters.c * * - Fixed mem leak in free_http_response(), map_block_killer(), * * - Removed logentry from cancelled commit * * Revision 1.7 2001/06/09 10:51:58 jongfoster * Changing "show URL info" handler to new style. * Changing BUFSIZ ==> BUFFER_SIZE * * Revision 1.6 2001/06/07 23:05:19 jongfoster * Removing code related to old forward and ACL files. * * Revision 1.5 2001/06/05 19:59:16 jongfoster * Fixing multiline character string (a GCC-only "feature"), and snprintf (it's _snprintf under VC++). * * Revision 1.4 2001/06/04 10:41:52 swa * show version string of cgi.h and cgi.c * * Revision 1.3 2001/06/03 19:12:16 oes * introduced new cgi handling * * No revisions before 1.3 * **********************************************************************/ #include "config.h" #include #include #include #include #include #include #include #include "project.h" #include "cgi.h" #include "list.h" #include "encode.h" #include "ssplit.h" #include "errlog.h" #include "filters.h" #include "miscutil.h" #include "cgisimple.h" #include "jbsockets.h" #if defined(FEATURE_CGI_EDIT_ACTIONS) || defined(FEATURE_TOGGLE) #include "cgiedit.h" #endif /* defined(FEATURE_CGI_EDIT_ACTIONS) || defined (FEATURE_TOGGLE) */ #include "loadcfg.h" /* loadcfg.h is for global_toggle_state only */ #ifdef FEATURE_PTHREAD #include "jcc.h" /* jcc.h is for mutex semaphore globals only */ #endif /* def FEATURE_PTHREAD */ const char cgi_h_rcs[] = CGI_H_VERSION; /* * List of CGI functions: name, handler, description * Note: Do NOT use single quotes in the description; * this will break the dynamic "blocked" template! */ static const struct cgi_dispatcher cgi_dispatchers[] = { { "", cgi_default, "Privoxy main page", TRUE }, #ifdef FEATURE_GRACEFUL_TERMINATION { "die", cgi_die, "Shut down - Do not deploy this build in a production environment, " "this is a one click Denial Of Service attack!!!", FALSE }, #endif { "show-status", cgi_show_status, #ifdef FEATURE_CGI_EDIT_ACTIONS "View & change the current configuration", #else "View the current configuration", #endif TRUE }, { "show-version", cgi_show_version, "View the source code version numbers", TRUE }, { "show-request", cgi_show_request, "View the request headers", TRUE }, { "show-url-info", cgi_show_url_info, "Look up which actions apply to a URL and why", TRUE }, #ifdef FEATURE_TOGGLE { "toggle", cgi_toggle, "Toggle Privoxy on or off", FALSE }, #endif /* def FEATURE_TOGGLE */ #ifdef FEATURE_CGI_EDIT_ACTIONS { "edit-actions", /* Edit the actions list */ cgi_edit_actions, NULL, FALSE }, { "eaa", /* Shortcut for edit-actions-add-url-form */ cgi_edit_actions_add_url_form, NULL, FALSE }, { "eau", /* Shortcut for edit-actions-url-form */ cgi_edit_actions_url_form, NULL, FALSE }, { "ear", /* Shortcut for edit-actions-remove-url-form */ cgi_edit_actions_remove_url_form, NULL, FALSE }, { "eal", /* Shortcut for edit-actions-list */ cgi_edit_actions_list, NULL, FALSE }, { "eafu", /* Shortcut for edit-actions-for-url */ cgi_edit_actions_for_url, NULL, FALSE }, { "eas", /* Shortcut for edit-actions-submit */ cgi_edit_actions_submit, NULL, FALSE }, { "easa", /* Shortcut for edit-actions-section-add */ cgi_edit_actions_section_add, NULL, FALSE }, { "easr", /* Shortcut for edit-actions-section-remove */ cgi_edit_actions_section_remove, NULL, FALSE }, { "eass", /* Shortcut for edit-actions-section-swap */ cgi_edit_actions_section_swap, NULL, FALSE }, { "edit-actions-for-url", cgi_edit_actions_for_url, NULL, FALSE /* Edit the actions for (a) specified URL(s) */ }, { "edit-actions-list", cgi_edit_actions_list, NULL, TRUE /* Edit the actions list */ }, { "edit-actions-submit", cgi_edit_actions_submit, NULL, FALSE /* Change the actions for (a) specified URL(s) */ }, { "edit-actions-url", cgi_edit_actions_url, NULL, FALSE /* Change a URL pattern in the actionsfile */ }, { "edit-actions-url-form", cgi_edit_actions_url_form, NULL, FALSE /* Form to change a URL pattern in the actionsfile */ }, { "edit-actions-add-url", cgi_edit_actions_add_url, NULL, FALSE /* Add a URL pattern to the actionsfile */ }, { "edit-actions-add-url-form", cgi_edit_actions_add_url_form, NULL, FALSE /* Form to add a URL pattern to the actionsfile */ }, { "edit-actions-remove-url", cgi_edit_actions_remove_url, NULL, FALSE /* Remove a URL pattern from the actionsfile */ }, { "edit-actions-remove-url-form", cgi_edit_actions_remove_url_form, NULL, FALSE /* Form to remove a URL pattern from the actionsfile */ }, { "edit-actions-section-add", cgi_edit_actions_section_add, NULL, FALSE /* Remove a section from the actionsfile */ }, { "edit-actions-section-remove", cgi_edit_actions_section_remove, NULL, FALSE /* Remove a section from the actionsfile */ }, { "edit-actions-section-swap", cgi_edit_actions_section_swap, NULL, FALSE /* Swap two sections in the actionsfile */ }, #endif /* def FEATURE_CGI_EDIT_ACTIONS */ { "error-favicon.ico", cgi_send_error_favicon, NULL, TRUE /* Sends the favicon image for error pages. */ }, { "favicon.ico", cgi_send_default_favicon, NULL, TRUE /* Sends the default favicon image. */ }, { "robots.txt", cgi_robots_txt, NULL, TRUE /* Sends a robots.txt file to tell robots to go away. */ }, { "send-banner", cgi_send_banner, NULL, TRUE /* Send a built-in image */ }, { "send-stylesheet", cgi_send_stylesheet, NULL, FALSE /* Send templates/cgi-style.css */ }, { "t", cgi_transparent_image, NULL, TRUE /* Send a transparent image (short name) */ }, { "url-info-osd.xml", cgi_send_url_info_osd, NULL, TRUE /* Send templates/url-info-osd.xml */ }, { "user-manual", cgi_send_user_manual, NULL, TRUE /* Send user-manual */ }, { NULL, /* NULL Indicates end of list and default page */ cgi_error_404, NULL, TRUE /* Unknown CGI page */ } }; /* * Built-in images for ad replacement * * Hint: You can encode your own images like this: * cat your-image | perl -e 'while (read STDIN, $c, 1) { printf("\\%.3o", unpack("C", $c)); }' */ #ifdef FEATURE_NO_GIFS /* * Checkerboard pattern, as a PNG. */ const char image_pattern_data[] = "\211\120\116\107\015\012\032\012\000\000\000\015\111\110\104" "\122\000\000\000\004\000\000\000\004\010\006\000\000\000\251" "\361\236\176\000\000\000\006\142\113\107\104\000\000\000\000" "\000\000\371\103\273\177\000\000\000\033\111\104\101\124\010" "\327\143\140\140\140\060\377\377\377\077\003\234\106\341\060" "\060\230\063\020\124\001\000\161\021\031\241\034\364\030\143" "\000\000\000\000\111\105\116\104\256\102\140\202"; /* * 1x1 transparant PNG. */ const char image_blank_data[] = "\211\120\116\107\015\012\032\012\000\000\000\015\111\110\104\122" "\000\000\000\001\000\000\000\001\001\003\000\000\000\045\333\126" "\312\000\000\000\003\120\114\124\105\377\377\377\247\304\033\310" "\000\000\000\001\164\122\116\123\000\100\346\330\146\000\000\000" "\001\142\113\107\104\000\210\005\035\110\000\000\000\012\111\104" "\101\124\170\001\143\140\000\000\000\002\000\001\163\165\001\030" "\000\000\000\000\111\105\116\104\256\102\140\202"; #else /* * Checkerboard pattern, as a GIF. */ const char image_pattern_data[] = "\107\111\106\070\071\141\004\000\004\000\200\000\000\310\310" "\310\377\377\377\041\376\016\111\040\167\141\163\040\141\040" "\142\141\156\156\145\162\000\041\371\004\001\012\000\001\000" "\054\000\000\000\000\004\000\004\000\000\002\005\104\174\147" "\270\005\000\073"; /* * 1x1 transparant GIF. */ const char image_blank_data[] = "GIF89a\001\000\001\000\200\000\000\377\377\377\000\000" "\000!\371\004\001\000\000\000\000,\000\000\000\000\001" "\000\001\000\000\002\002D\001\000;"; #endif const size_t image_pattern_length = sizeof(image_pattern_data) - 1; const size_t image_blank_length = sizeof(image_blank_data) - 1; static struct http_response cgi_error_memory_response[1]; static struct http_response *dispatch_known_cgi(struct client_state * csp, const char * path); static struct map *parse_cgi_parameters(char *argstring); /********************************************************************* * * Function : dispatch_cgi * * Description : Checks if a request URL has either the magical * hostname CGI_SITE_1_HOST (usually http://p.p/) or * matches CGI_SITE_2_HOST CGI_SITE_2_PATH (usually * http://config.privoxy.org/). If so, it passes * the (rest of the) path onto dispatch_known_cgi, which * calls the relevant CGI handler function. * * Parameters : * 1 : csp = Current client state (buffers, headers, etc...) * * Returns : http_response if match, NULL if nonmatch or handler fail * *********************************************************************/ struct http_response *dispatch_cgi(struct client_state *csp) { const char *host = csp->http->host; const char *path = csp->http->path; /* * Should we intercept ? */ /* Note: "example.com" and "example.com." are equivalent hostnames. */ /* Either the host matches CGI_SITE_1_HOST ..*/ if ( ( (0 == strcmpic(host, CGI_SITE_1_HOST)) || (0 == strcmpic(host, CGI_SITE_1_HOST "."))) && (path[0] == '/') ) { /* ..then the path will all be for us. Remove leading '/' */ path++; } /* Or it's the host part CGI_SITE_2_HOST, and the path CGI_SITE_2_PATH */ else if ( ( (0 == strcmpic(host, CGI_SITE_2_HOST )) || (0 == strcmpic(host, CGI_SITE_2_HOST ".")) ) && (0 == strncmpic(path, CGI_SITE_2_PATH, strlen(CGI_SITE_2_PATH))) ) { /* take everything following CGI_SITE_2_PATH */ path += strlen(CGI_SITE_2_PATH); if (*path == '/') { /* skip the forward slash after CGI_SITE_2_PATH */ path++; } else if (*path != '\0') { /* * weirdness: URL is /configXXX, where XXX is some string * Do *NOT* intercept. */ return NULL; } } else { /* Not a CGI */ return NULL; } /* * This is a CGI call. */ return dispatch_known_cgi(csp, path); } /********************************************************************* * * Function : grep_cgi_referrer * * Description : Ugly provisorical fix that greps the value of the * referer HTTP header field out of a linked list of * strings like found at csp->headers. Will disappear * in Privoxy 3.1. * * FIXME: csp->headers ought to be csp->http->headers * FIXME: Parsing all client header lines should * happen right after the request is received! * * Parameters : * 1 : csp = Current client state (buffers, headers, etc...) * * Returns : pointer to value (no copy!), or NULL if none found. * *********************************************************************/ static char *grep_cgi_referrer(const struct client_state *csp) { struct list_entry *p; for (p = csp->headers->first; p != NULL; p = p->next) { if (p->str == NULL) continue; if (strncmpic(p->str, "Referer: ", 9) == 0) { return ((p->str) + 9); } } return NULL; } /********************************************************************* * * Function : referrer_is_safe * * Description : Decides whether we trust the Referer for * CGI pages which are only meant to be reachable * through Privoxy's web interface directly. * * Parameters : * 1 : csp = Current client state (buffers, headers, etc...) * * Returns : TRUE if the referrer is safe, or * FALSE if the referrer is unsafe or not set. * *********************************************************************/ static int referrer_is_safe(const struct client_state *csp) { char *referrer; static const char alternative_prefix[] = "http://" CGI_SITE_1_HOST "/"; referrer = grep_cgi_referrer(csp); if (NULL == referrer) { /* No referrer, no access */ log_error(LOG_LEVEL_ERROR, "Denying access to %s. No referrer found.", csp->http->url); } else if ((0 == strncmp(referrer, CGI_PREFIX, sizeof(CGI_PREFIX)-1) || (0 == strncmp(referrer, alternative_prefix, strlen(alternative_prefix))))) { /* Trustworthy referrer */ log_error(LOG_LEVEL_CGI, "Granting access to %s, referrer %s is trustworthy.", csp->http->url, referrer); return TRUE; } else { /* Untrustworthy referrer */ log_error(LOG_LEVEL_ERROR, "Denying access to %s, referrer %s isn't trustworthy.", csp->http->url, referrer); } return FALSE; } /********************************************************************* * * Function : dispatch_known_cgi * * Description : Processes a CGI once dispatch_cgi has determined that * it matches one of the magic prefixes. Parses the path * as a cgi name plus query string, prepares a map that * maps CGI parameter names to their values, initializes * the http_response struct, and calls the relevant CGI * handler function. * * Parameters : * 1 : csp = Current client state (buffers, headers, etc...) * 2 : path = Path of CGI, with the CGI prefix removed. * Should not have a leading "/". * * Returns : http_response, or NULL on handler failure or out of * memory. * *********************************************************************/ static struct http_response *dispatch_known_cgi(struct client_state * csp, const char * path) { const struct cgi_dispatcher *d; struct map *param_list; struct http_response *rsp; char *query_args_start; char *path_copy; jb_err err; if (NULL == (path_copy = strdup(path))) { return cgi_error_memory(); } query_args_start = path_copy; while (*query_args_start && *query_args_start != '?' && *query_args_start != '/') { query_args_start++; } if (*query_args_start == '/') { *query_args_start++ = '\0'; if ((param_list = new_map())) { map(param_list, "file", 1, url_decode(query_args_start), 0); } } else { if (*query_args_start == '?') { *query_args_start++ = '\0'; } if (NULL == (param_list = parse_cgi_parameters(query_args_start))) { free(path_copy); return cgi_error_memory(); } } /* * At this point: * path_copy = CGI call name * param_list = CGI params, as map */ /* Get mem for response or fail*/ if (NULL == (rsp = alloc_http_response())) { free(path_copy); free_map(param_list); return cgi_error_memory(); } /* * Find and start the right CGI function */ d = cgi_dispatchers; for (;;) { if ((d->name == NULL) || (strcmp(path_copy, d->name) == 0)) { /* * If the called CGI is either harmless, or referred * from a trusted source, start it. */ if (d->harmless || referrer_is_safe(csp)) { err = (d->handler)(csp, rsp, param_list); } else { /* * Else, modify toggle calls so that they only display * the status, and deny all other calls. */ if (0 == strcmp(path_copy, "toggle")) { unmap(param_list, "set"); err = (d->handler)(csp, rsp, param_list); } else { err = cgi_error_disabled(csp, rsp); } } free(path_copy); free_map(param_list); if (err == JB_ERR_CGI_PARAMS) { err = cgi_error_bad_param(csp, rsp); } if (err && (err != JB_ERR_MEMORY)) { /* Unexpected error! Shouldn't get here */ log_error(LOG_LEVEL_ERROR, "Unexpected CGI error %d in top-level handler. Please file a bug report!", err); err = cgi_error_unknown(csp, rsp, err); } if (!err) { /* It worked */ rsp->reason = RSP_REASON_CGI_CALL; return finish_http_response(csp, rsp); } else { /* Error in handler, probably out-of-memory */ free_http_response(rsp); return cgi_error_memory(); } } d++; } } /********************************************************************* * * Function : parse_cgi_parameters * * Description : Parse a URL-encoded argument string into name/value * pairs and store them in a struct map list. * * Parameters : * 1 : argstring = string to be parsed. Will be trashed. * * Returns : pointer to param list, or NULL if out of memory. * *********************************************************************/ static struct map *parse_cgi_parameters(char *argstring) { char *p; char *vector[BUFFER_SIZE]; int pairs, i; struct map *cgi_params; if (NULL == (cgi_params = new_map())) { return NULL; } /* * IE 5 does, of course, violate RFC 2316 Sect 4.1 and sends * the fragment identifier along with the request, so we must * cut it off here, so it won't pollute the CGI params: */ if (NULL != (p = strchr(argstring, '#'))) { *p = '\0'; } pairs = ssplit(argstring, "&", vector, SZ(vector), 1, 1); for (i = 0; i < pairs; i++) { if ((NULL != (p = strchr(vector[i], '='))) && (*(p+1) != '\0')) { *p = '\0'; if (map(cgi_params, url_decode(vector[i]), 0, url_decode(++p), 0)) { free_map(cgi_params); return NULL; } } } return cgi_params; } /********************************************************************* * * Function : get_char_param * * Description : Get a single-character parameter passed to a CGI * function. * * Parameters : * 1 : parameters = map of cgi parameters * 2 : param_name = The name of the parameter to read * * Returns : Uppercase character on success, '\0' on error. * *********************************************************************/ char get_char_param(const struct map *parameters, const char *param_name) { char ch; assert(parameters); assert(param_name); ch = *(lookup(parameters, param_name)); if ((ch >= 'a') && (ch <= 'z')) { ch = (char)(ch - 'a' + 'A'); } return ch; } /********************************************************************* * * Function : get_string_param * * Description : Get a string paramater, to be used as an * ACTION_STRING or ACTION_MULTI paramater. * Validates the input to prevent stupid/malicious * users from corrupting their action file. * * Parameters : * 1 : parameters = map of cgi parameters * 2 : param_name = The name of the parameter to read * 3 : pparam = destination for paramater. Allocated as * part of the map "parameters", so don't free it. * Set to NULL if not specified. * * Returns : JB_ERR_OK on success, or if the paramater * was not specified. * JB_ERR_MEMORY on out-of-memory. * JB_ERR_CGI_PARAMS if the paramater is not valid. * *********************************************************************/ jb_err get_string_param(const struct map *parameters, const char *param_name, const char **pparam) { const char *param; const char *s; char ch; assert(parameters); assert(param_name); assert(pparam); *pparam = NULL; param = lookup(parameters, param_name); if (!*param) { return JB_ERR_OK; } if (strlen(param) >= CGI_PARAM_LEN_MAX) { /* * Too long. * * Note that the length limit is arbitrary, it just seems * sensible to limit it to *something*. There's no * technical reason for any limit at all. */ return JB_ERR_CGI_PARAMS; } /* Check every character to see if it's legal */ s = param; while ((ch = *s++) != '\0') { if ( ((unsigned char)ch < (unsigned char)' ') || (ch == '}') ) { /* Probable hack attempt, or user accidentally used '}'. */ return JB_ERR_CGI_PARAMS; } } /* Success */ *pparam = param; return JB_ERR_OK; } /********************************************************************* * * Function : get_number_param * * Description : Get a non-negative integer from the parameters * passed to a CGI function. * * Parameters : * 1 : csp = Current client state (buffers, headers, etc...) * 2 : parameters = map of cgi parameters * 3 : name = Name of CGI parameter to read * 4 : pvalue = destination for value. * Set to -1 on error. * * Returns : JB_ERR_OK on success * JB_ERR_MEMORY on out-of-memory * JB_ERR_CGI_PARAMS if the parameter was not specified * or is not valid. * *********************************************************************/ jb_err get_number_param(struct client_state *csp, const struct map *parameters, char *name, unsigned *pvalue) { const char *param; char ch; unsigned value; assert(csp); assert(parameters); assert(name); assert(pvalue); *pvalue = 0; param = lookup(parameters, name); if (!*param) { return JB_ERR_CGI_PARAMS; } /* We don't use atoi because I want to check this carefully... */ value = 0; while ((ch = *param++) != '\0') { if ((ch < '0') || (ch > '9')) { return JB_ERR_CGI_PARAMS; } ch = (char)(ch - '0'); /* Note: * * defines UINT_MAX * * (UINT_MAX - ch) / 10 is the largest number that * can be safely multiplied by 10 then have ch added. */ if (value > ((UINT_MAX - (unsigned)ch) / 10U)) { return JB_ERR_CGI_PARAMS; } value = value * 10 + (unsigned)ch; } /* Success */ *pvalue = value; return JB_ERR_OK; } /********************************************************************* * * Function : error_response * * Description : returns an http_response that explains the reason * why a request failed. * * Parameters : * 1 : csp = Current client state (buffers, headers, etc...) * 2 : templatename = Which template should be used for the answer * 3 : sys_err = system error number * * Returns : A http_response. If we run out of memory, this * will be cgi_error_memory(). * *********************************************************************/ struct http_response *error_response(struct client_state *csp, const char *templatename, int sys_err) { jb_err err; struct http_response *rsp; struct map *exports = default_exports(csp, NULL); char *path = NULL; if (exports == NULL) { return cgi_error_memory(); } if (NULL == (rsp = alloc_http_response())) { free_map(exports); return cgi_error_memory(); } #ifdef FEATURE_FORCE_LOAD if (csp->flags & CSP_FLAG_FORCED) { path = strdup(FORCE_PREFIX); } else #endif /* def FEATURE_FORCE_LOAD */ { path = strdup(""); } err = string_append(&path, csp->http->path); if (!err) err = map(exports, "host", 1, html_encode(csp->http->host), 0); if (!err) err = map(exports, "hostport", 1, html_encode(csp->http->hostport), 0); if (!err) err = map(exports, "path", 1, html_encode_and_free_original(path), 0); if (!err) err = map(exports, "error", 1, html_encode_and_free_original(safe_strerror(sys_err)), 0); if (!err) err = map(exports, "protocol", 1, csp->http->ssl ? "https://" : "http://", 1); if (!err) { err = map(exports, "host-ip", 1, html_encode(csp->http->host_ip_addr_str), 0); if (err) { /* Some failures, like "404 no such domain", don't have an IP address. */ err = map(exports, "host-ip", 1, html_encode(csp->http->host), 0); } } if (err) { free_map(exports); free_http_response(rsp); return cgi_error_memory(); } if (!strcmp(templatename, "no-such-domain")) { rsp->status = strdup("404 No such domain"); if (rsp->status == NULL) { free_map(exports); free_http_response(rsp); return cgi_error_memory(); } rsp->reason = RSP_REASON_NO_SUCH_DOMAIN; } else if (!strcmp(templatename, "forwarding-failed")) { const struct forward_spec *fwd = forward_url(csp, csp->http); char *socks_type = NULL; if (fwd == NULL) { log_error(LOG_LEVEL_FATAL, "gateway spec is NULL. This shouldn't happen!"); /* Never get here - LOG_LEVEL_FATAL causes program exit */ } /* * XXX: While the template is called forwarding-failed, * it currently only handles socks forwarding failures. */ assert(fwd->type != SOCKS_NONE); /* * Map failure reason, forwarding type and forwarder. */ if (NULL == csp->error_message) { /* * Either we forgot to record the failure reason, * or the memory allocation failed. */ log_error(LOG_LEVEL_ERROR, "Socks failure reason missing."); csp->error_message = strdup("Failure reason missing. Check the log file for details."); } if (!err) err = map(exports, "gateway", 1, fwd->gateway_host, 1); /* * XXX: this is almost the same code as in cgi_show_url_info() * and thus should be factored out and shared. */ switch (fwd->type) { case SOCKS_4: socks_type = "socks4-"; break; case SOCKS_4A: socks_type = "socks4a-"; break; case SOCKS_5: socks_type = "socks5-"; break; default: log_error(LOG_LEVEL_FATAL, "Unknown socks type: %d.", fwd->type); } if (!err) err = map(exports, "forwarding-type", 1, socks_type, 1); if (!err) err = map(exports, "error-message", 1, html_encode(csp->error_message), 0); if (!err) rsp->status = strdup("503 Forwarding failure"); if ((rsp->status == NULL) || (NULL == csp->error_message) || err) { free_map(exports); free_http_response(rsp); return cgi_error_memory(); } rsp->reason = RSP_REASON_FORWARDING_FAILED; } else if (!strcmp(templatename, "connect-failed")) { rsp->status = strdup("503 Connect failed"); if (rsp->status == NULL) { free_map(exports); free_http_response(rsp); return cgi_error_memory(); } rsp->reason = RSP_REASON_CONNECT_FAILED; } err = template_fill_for_cgi(csp, templatename, exports, rsp); if (err) { free_http_response(rsp); return cgi_error_memory(); } return finish_http_response(csp, rsp); } /********************************************************************* * * Function : cgi_error_disabled * * Description : CGI function that is called to generate an error * response if the actions editor or toggle CGI are * accessed despite having being disabled at compile- * or run-time, or if the user followed an untrusted link * to access a unsafe CGI feature that is only reachable * through Privoxy directly. * * Parameters : * 1 : csp = Current client state (buffers, headers, etc...) * 2 : rsp = http_response data structure for output * * CGI Parameters : none * * Returns : JB_ERR_OK on success * JB_ERR_MEMORY on out-of-memory error. * *********************************************************************/ jb_err cgi_error_disabled(const struct client_state *csp, struct http_response *rsp) { struct map *exports; assert(csp); assert(rsp); if (NULL == (exports = default_exports(csp, "cgi-error-disabled"))) { return JB_ERR_MEMORY; } if (map(exports, "url", 1, html_encode(csp->http->url), 0)) { /* Not important enough to do anything */ log_error(LOG_LEVEL_ERROR, "Failed to fill in url."); } return template_fill_for_cgi(csp, "cgi-error-disabled", exports, rsp); } /********************************************************************* * * Function : cgi_init_error_messages * * Description : Call at the start of the program to initialize * the error message used by cgi_error_memory(). * * Parameters : N/A * * Returns : N/A * *********************************************************************/ void cgi_init_error_messages(void) { memset(cgi_error_memory_response, '\0', sizeof(*cgi_error_memory_response)); cgi_error_memory_response->head = "HTTP/1.0 500 Internal Privoxy Error\r\n" "Content-Type: text/html\r\n" "\r\n"; cgi_error_memory_response->body = "\r\n" "\r\n" " 500 Internal Privoxy Error\r\n" " " "\r\n" "\r\n" "

500 Internal Privoxy Error

\r\n" "

Privoxy ran out of memory while processing your request.

\r\n" "

Please contact your proxy administrator, or try again later

\r\n" "\r\n" "\r\n"; cgi_error_memory_response->head_length = strlen(cgi_error_memory_response->head); cgi_error_memory_response->content_length = strlen(cgi_error_memory_response->body); cgi_error_memory_response->reason = RSP_REASON_OUT_OF_MEMORY; } /********************************************************************* * * Function : cgi_error_memory * * Description : Called if a CGI function runs out of memory. * Returns a statically-allocated error response. * * Parameters : N/A * * Returns : http_response data structure for output. This is * statically allocated, for obvious reasons. * *********************************************************************/ struct http_response *cgi_error_memory(void) { /* assert that it's been initialized. */ assert(cgi_error_memory_response->head); return cgi_error_memory_response; } /********************************************************************* * * Function : cgi_error_no_template * * Description : Almost-CGI function that is called if a template * cannot be loaded. Note this is not a true CGI, * it takes a template name rather than a map of * parameters. * * Parameters : * 1 : csp = Current client state (buffers, headers, etc...) * 2 : rsp = http_response data structure for output * 3 : template_name = Name of template that could not * be loaded. * * Returns : JB_ERR_OK on success * JB_ERR_MEMORY on out-of-memory error. * *********************************************************************/ jb_err cgi_error_no_template(const struct client_state *csp, struct http_response *rsp, const char *template_name) { static const char status[] = "500 Internal Privoxy Error"; static const char body_prefix[] = "\r\n" "\r\n" " 500 Internal Privoxy Error\r\n" " " "\r\n" "\r\n" "

500 Internal Privoxy Error

\r\n" "

Privoxy encountered an error while processing your request:

\r\n" "

Could not load template file "; static const char body_suffix[] = " or one of its included components.

\r\n" "

Please contact your proxy administrator.

\r\n" "

If you are the proxy administrator, please put the required file(s)" "in the (confdir)/templates directory. The " "location of the (confdir) directory " "is specified in the main Privoxy config " "file. (It's typically the Privoxy install directory" #ifndef _WIN32 ", or /etc/privoxy/" #endif /* ndef _WIN32 */ ").

\r\n" "\r\n" "\r\n"; const size_t body_size = strlen(body_prefix) + strlen(template_name) + strlen(body_suffix) + 1; assert(csp); assert(rsp); assert(template_name); /* Reset rsp, if needed */ freez(rsp->status); freez(rsp->head); freez(rsp->body); rsp->content_length = 0; rsp->head_length = 0; rsp->is_static = 0; rsp->body = malloc(body_size); if (rsp->body == NULL) { return JB_ERR_MEMORY; } strlcpy(rsp->body, body_prefix, body_size); strlcat(rsp->body, template_name, body_size); strlcat(rsp->body, body_suffix, body_size); rsp->status = strdup(status); if (rsp->status == NULL) { return JB_ERR_MEMORY; } return JB_ERR_OK; } /********************************************************************* * * Function : cgi_error_unknown * * Description : Almost-CGI function that is called if an unexpected * error occurs in the top-level CGI dispatcher. * In this context, "unexpected" means "anything other * than JB_ERR_MEMORY or JB_ERR_CGI_PARAMS" - CGIs are * expected to handle all other errors internally, * since they can give more relavent error messages * that way. * * Note this is not a true CGI, it takes an error * code rather than a map of parameters. * * Parameters : * 1 : csp = Current client state (buffers, headers, etc...) * 2 : rsp = http_response data structure for output * 3 : error_to_report = Error code to report. * * Returns : JB_ERR_OK on success * JB_ERR_MEMORY on out-of-memory error. * *********************************************************************/ jb_err cgi_error_unknown(const struct client_state *csp, struct http_response *rsp, jb_err error_to_report) { static const char status[] = "500 Internal Privoxy Error"; static const char body_prefix[] = "\r\n" "\r\n" " 500 Internal Privoxy Error\r\n" " " "\r\n" "\r\n" "

500 Internal Privoxy Error

\r\n" "

Privoxy encountered an error while processing your request:

\r\n" "

Unexpected internal error: "; static const char body_suffix[] = "

\r\n" "

Please " "" "file a bug report.

\r\n" "\r\n" "\r\n"; char errnumbuf[30]; /* * Due to sizeof(errnumbuf), body_size will be slightly * bigger than necessary but it doesn't really matter. */ const size_t body_size = strlen(body_prefix) + sizeof(errnumbuf) + strlen(body_suffix) + 1; assert(csp); assert(rsp); /* Reset rsp, if needed */ freez(rsp->status); freez(rsp->head); freez(rsp->body); rsp->content_length = 0; rsp->head_length = 0; rsp->is_static = 0; rsp->reason = RSP_REASON_INTERNAL_ERROR; snprintf(errnumbuf, sizeof(errnumbuf), "%d", error_to_report); rsp->body = malloc(body_size); if (rsp->body == NULL) { return JB_ERR_MEMORY; } strlcpy(rsp->body, body_prefix, body_size); strlcat(rsp->body, errnumbuf, body_size); strlcat(rsp->body, body_suffix, body_size); rsp->status = strdup(status); if (rsp->status == NULL) { return JB_ERR_MEMORY; } return JB_ERR_OK; } /********************************************************************* * * Function : cgi_error_bad_param * * Description : CGI function that is called if the parameters * (query string) for a CGI were wrong. * * Parameters : * 1 : csp = Current client state (buffers, headers, etc...) * 2 : rsp = http_response data structure for output * * CGI Parameters : none * * Returns : JB_ERR_OK on success * JB_ERR_MEMORY on out-of-memory error. * *********************************************************************/ jb_err cgi_error_bad_param(const struct client_state *csp, struct http_response *rsp) { struct map *exports; assert(csp); assert(rsp); if (NULL == (exports = default_exports(csp, NULL))) { return JB_ERR_MEMORY; } return template_fill_for_cgi(csp, "cgi-error-bad-param", exports, rsp); } /********************************************************************* * * Function : cgi_redirect * * Description : CGI support function to generate a HTTP redirect * message * * Parameters : * 1 : rsp = http_response data structure for output * 2 : target = string with the target URL * * CGI Parameters : None * * Returns : JB_ERR_OK on success * JB_ERR_MEMORY on out-of-memory error. * *********************************************************************/ jb_err cgi_redirect (struct http_response * rsp, const char *target) { jb_err err; assert(rsp); assert(target); err = enlist_unique_header(rsp->headers, "Location", target); rsp->status = strdup("302 Local Redirect from Privoxy"); if (rsp->status == NULL) { return JB_ERR_MEMORY; } return err; } /********************************************************************* * * Function : add_help_link * * Description : Produce a copy of the string given as item, * embedded in an HTML link to its corresponding * section (item name in uppercase) in the actions * chapter of the user manual, (whose URL is given in * the config and defaults to our web site). * * FIXME: I currently only work for actions, and would * like to be generalized for other topics. * * Parameters : * 1 : item = item (will NOT be free()d.) * It is assumed to be HTML-safe. * 2 : config = The current configuration. * * Returns : String with item embedded in link, or NULL on * out-of-memory * *********************************************************************/ char *add_help_link(const char *item, struct configuration_spec *config) { char *result; if (!item) return NULL; result = strdup("usermanual, "file://", 7) || !strncmpic(config->usermanual, "http", 4)) { string_append(&result, config->usermanual); } else { string_append(&result, "http://"); string_append(&result, CGI_SITE_2_HOST); string_append(&result, "/user-manual/"); } string_append(&result, ACTIONS_HELP_PREFIX); string_join (&result, string_toupper(item)); string_append(&result, "\">"); string_append(&result, item); string_append(&result, " "); return result; } /********************************************************************* * * Function : get_http_time * * Description : Get the time in a format suitable for use in a * HTTP header - e.g.: * "Sun, 06 Nov 1994 08:49:37 GMT" * * Parameters : * 1 : time_offset = Time returned will be current time * plus this number of seconds. * 2 : buf = Destination for result. * 3 : buffer_size = Size of the buffer above. Must be big * enough to hold 29 characters plus a * trailing zero. * * Returns : N/A * *********************************************************************/ void get_http_time(int time_offset, char *buf, size_t buffer_size) { static const char day_names[7][4] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" }; static const char month_names[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" }; struct tm *t; time_t current_time; #if defined(HAVE_GMTIME_R) struct tm dummy; #endif assert(buf); assert(buffer_size > 29); time(¤t_time); current_time += time_offset; /* get and save the gmt */ #if HAVE_GMTIME_R t = gmtime_r(¤t_time, &dummy); #elif FEATURE_PTHREAD privoxy_mutex_lock(&gmtime_mutex); t = gmtime(¤t_time); privoxy_mutex_unlock(&gmtime_mutex); #else t = gmtime(¤t_time); #endif /* Format: "Sun, 06 Nov 1994 08:49:37 GMT" */ snprintf(buf, buffer_size, "%s, %02d %s %4d %02d:%02d:%02d GMT", day_names[t->tm_wday], t->tm_mday, month_names[t->tm_mon], t->tm_year + 1900, t->tm_hour, t->tm_min, t->tm_sec ); } /********************************************************************* * * Function : get_locale_time * * Description : Get the time in a date(1)-like format * according to the current locale - e.g.: * "Fri Aug 29 19:37:12 CEST 2008" * * XXX: Should we allow the user to change the format? * * Parameters : * 1 : buf = Destination for result. * 2 : buffer_size = Size of the buffer above. Must be big * enough to hold 29 characters plus a * trailing zero. * * Returns : N/A * *********************************************************************/ static void get_locale_time(char *buf, size_t buffer_size) { struct tm *timeptr; time_t current_time; #if defined(HAVE_LOCALTIME_R) struct tm dummy; #endif assert(buf); assert(buffer_size > 29); time(¤t_time); #if HAVE_LOCALTIME_R timeptr = localtime_r(¤t_time, &dummy); #elif FEATURE_PTHREAD privoxy_mutex_lock(&localtime_mutex); timeptr = localtime(¤t_time); privoxy_mutex_unlock(&localtime_mutex); #else timeptr = localtime(¤t_time); #endif strftime(buf, buffer_size, "%a %b %d %X %Z %Y", timeptr); } /********************************************************************* * * Function : finish_http_response * * Description : Fill in the missing headers in an http response, * and flatten the headers to an http head. * For HEAD requests the body is freed once * the Content-Length header is set. * * Parameters : * 1 : rsp = pointer to http_response to be processed * * Returns : A http_response, usually the rsp parameter. * On error, free()s rsp and returns cgi_error_memory() * *********************************************************************/ struct http_response *finish_http_response(const struct client_state *csp, struct http_response *rsp) { char buf[BUFFER_SIZE]; jb_err err; /* Special case - do NOT change this statically allocated response, * which is ready for output anyway. */ if (rsp == cgi_error_memory_response) { return rsp; } /* * Fill in the HTTP Status, using HTTP/1.1 * unless the client asked for HTTP/1.0. */ snprintf(buf, sizeof(buf), "%s %s", strcmpic(csp->http->ver, "HTTP/1.0") ? "HTTP/1.1" : "HTTP/1.0", rsp->status ? rsp->status : "200 OK"); err = enlist_first(rsp->headers, buf); /* * Set the Content-Length */ if (rsp->content_length == 0) { rsp->content_length = rsp->body ? strlen(rsp->body) : 0; } if (!err) { snprintf(buf, sizeof(buf), "Content-Length: %d", (int)rsp->content_length); err = enlist(rsp->headers, buf); } if (0 == strcmpic(csp->http->gpc, "head")) { /* * The client only asked for the head. Dispose * the body and log an offensive message. * * While it may seem to be a bit inefficient to * prepare the body if it isn't needed, it's the * only way to get the Content-Length right for * dynamic pages. We could have disposed the body * earlier, but not without duplicating the * Content-Length setting code above. */ log_error(LOG_LEVEL_CGI, "Preparing to give head to %s.", csp->ip_addr_str); freez(rsp->body); rsp->content_length = 0; } if (strncmpic(rsp->status, "302", 3)) { /* * If it's not a redirect without any content, * set the Content-Type to text/html if it's * not already specified. */ if (!err) err = enlist_unique(rsp->headers, "Content-Type: text/html", 13); } /* * Fill in the rest of the default headers: * * Date: set to current date/time. * Last-Modified: set to date/time the page was last changed. * Expires: set to date/time page next needs reloading. * Cache-Control: set to "no-cache" if applicable. * * See http://www.w3.org/Protocols/rfc2068/rfc2068 */ if (rsp->is_static) { /* * Set Expires to about 10 min into the future so it'll get reloaded * occasionally, e.g. if Privoxy gets upgraded. */ if (!err) { get_http_time(0, buf, sizeof(buf)); err = enlist_unique_header(rsp->headers, "Date", buf); } /* Some date in the past. */ if (!err) err = enlist_unique_header(rsp->headers, "Last-Modified", "Sat, 17 Jun 2000 12:00:00 GMT"); if (!err) { get_http_time(10 * 60, buf, sizeof(buf)); /* 10 * 60sec = 10 minutes */ err = enlist_unique_header(rsp->headers, "Expires", buf); } } else if (!strncmpic(rsp->status, "302", 3)) { get_http_time(0, buf, sizeof(buf)); if (!err) err = enlist_unique_header(rsp->headers, "Date", buf); } else { /* * Setting "Cache-Control" to "no-cache" and "Expires" to * the current time doesn't exactly forbid caching, it just * requires the client to revalidate the cached copy. * * If a temporary problem occurs and the user tries again after * getting Privoxy's error message, a compliant browser may set the * If-Modified-Since header with the content of the error page's * Last-Modified header. More often than not, the document on the server * is older than Privoxy's error message, the server would send status code * 304 and the browser would display the outdated error message again and again. * * For documents delivered with status code 403, 404 and 503 we set "Last-Modified" * to Tim Berners-Lee's birthday, which predates the age of any page on the web * and can be safely used to "revalidate" without getting a status code 304. * * There is no need to let the useless If-Modified-Since header reach the * server, it is therefore stripped by client_if_modified_since in parsers.c. */ if (!err) err = enlist_unique_header(rsp->headers, "Cache-Control", "no-cache"); get_http_time(0, buf, sizeof(buf)); if (!err) err = enlist_unique_header(rsp->headers, "Date", buf); if (!strncmpic(rsp->status, "403", 3) || !strncmpic(rsp->status, "404", 3) || !strncmpic(rsp->status, "503", 3)) { if (!err) err = enlist_unique_header(rsp->headers, "Last-Modified", "Wed, 08 Jun 1955 12:00:00 GMT"); } else { if (!err) err = enlist_unique_header(rsp->headers, "Last-Modified", buf); } if (!err) err = enlist_unique_header(rsp->headers, "Expires", "Sat, 17 Jun 2000 12:00:00 GMT"); if (!err) err = enlist_unique_header(rsp->headers, "Pragma", "no-cache"); } /* * Quoting RFC 2616: * * HTTP/1.1 applications that do not support persistent connections MUST * include the "close" connection option in every message. */ if (!err) err = enlist_unique_header(rsp->headers, "Connection", "close"); /* * Write the head */ if (err || (NULL == (rsp->head = list_to_text(rsp->headers)))) { free_http_response(rsp); return cgi_error_memory(); } rsp->head_length = strlen(rsp->head); return rsp; } /********************************************************************* * * Function : alloc_http_response * * Description : Allocates a new http_response structure. * * Parameters : N/A * * Returns : pointer to a new http_response, or NULL. * *********************************************************************/ struct http_response *alloc_http_response(void) { return (struct http_response *) zalloc(sizeof(struct http_response)); } /********************************************************************* * * Function : free_http_response * * Description : Free the memory occupied by an http_response * and its depandant structures. * * Parameters : * 1 : rsp = pointer to http_response to be freed * * Returns : N/A * *********************************************************************/ void free_http_response(struct http_response *rsp) { /* * Must special case cgi_error_memory_response, which is never freed. */ if (rsp && (rsp != cgi_error_memory_response)) { freez(rsp->status); freez(rsp->head); freez(rsp->body); destroy_list(rsp->headers); free(rsp); } } /********************************************************************* * * Function : template_load * * Description : CGI support function that loads a given HTML * template, ignoring comment lines and following * #include statements up to a depth of 1. * * Parameters : * 1 : csp = Current client state (buffers, headers, etc...) * 2 : template_ptr = Destination for pointer to loaded * template text. * 3 : templatename = name of the HTML template to be used * 4 : recursive = Flag set if this function calls itself * following an #include statament * * Returns : JB_ERR_OK on success * JB_ERR_MEMORY on out-of-memory error. * JB_ERR_FILE if the template file cannot be read * *********************************************************************/ jb_err template_load(const struct client_state *csp, char **template_ptr, const char *templatename, int recursive) { jb_err err; char *templates_dir_path; char *full_path; char *file_buffer; char *included_module; const char *p; FILE *fp; char buf[BUFFER_SIZE]; assert(csp); assert(template_ptr); assert(templatename); *template_ptr = NULL; /* Validate template name. Paranoia. */ for (p = templatename; *p != 0; p++) { if ( ((*p < 'a') || (*p > 'z')) && ((*p < 'A') || (*p > 'Z')) && ((*p < '0') || (*p > '9')) && (*p != '-') && (*p != '.')) { /* Illegal character */ return JB_ERR_FILE; } } /* * Generate full path using either templdir * or confdir/templates as base directory. */ if (NULL != csp->config->templdir) { templates_dir_path = strdup(csp->config->templdir); } else { templates_dir_path = make_path(csp->config->confdir, "templates"); } if (templates_dir_path == NULL) { log_error(LOG_LEVEL_ERROR, "Out of memory while generating template path for %s.", templatename); return JB_ERR_MEMORY; } full_path = make_path(templates_dir_path, templatename); free(templates_dir_path); if (full_path == NULL) { log_error(LOG_LEVEL_ERROR, "Out of memory while generating full template path for %s.", templatename); return JB_ERR_MEMORY; } /* Allocate buffer */ file_buffer = strdup(""); if (file_buffer == NULL) { log_error(LOG_LEVEL_ERROR, "Not enough free memory to buffer %s.", full_path); free(full_path); return JB_ERR_MEMORY; } /* Open template file */ if (NULL == (fp = fopen(full_path, "r"))) { log_error(LOG_LEVEL_ERROR, "Cannot open template file %s: %E", full_path); free(full_path); free(file_buffer); return JB_ERR_FILE; } free(full_path); /* * Read the file, ignoring comments, and honoring #include * statements, unless we're already called recursively. * * FIXME: The comment handling could break with lines >BUFFER_SIZE long. * This is unlikely in practise. */ while (fgets(buf, BUFFER_SIZE, fp)) { if (!recursive && !strncmp(buf, "#include ", 9)) { if (JB_ERR_OK != (err = template_load(csp, &included_module, chomp(buf + 9), 1))) { free(file_buffer); fclose(fp); return err; } if (string_join(&file_buffer, included_module)) { fclose(fp); return JB_ERR_MEMORY; } continue; } /* skip lines starting with '#' */ if (*buf == '#') { continue; } if (string_append(&file_buffer, buf)) { fclose(fp); return JB_ERR_MEMORY; } } fclose(fp); *template_ptr = file_buffer; return JB_ERR_OK; } /********************************************************************* * * Function : template_fill * * Description : CGI support function that fills in a pre-loaded * HTML template by replacing @name@ with value using * pcrs, for each item in the output map. * * Note that a leading '$' charachter in the export map's * values will be stripped and toggle on backreference * interpretation. * * Parameters : * 1 : template_ptr = IN: Template to be filled out. * Will be free()d. * OUT: Filled out template. * Caller must free(). * 2 : exports = map with fill in symbol -> name pairs * * Returns : JB_ERR_OK on success (and for uncritical errors) * JB_ERR_MEMORY on out-of-memory error * *********************************************************************/ jb_err template_fill(char **template_ptr, const struct map *exports) { struct map_entry *m; pcrs_job *job; char buf[BUFFER_SIZE]; char *tmp_out_buffer; char *file_buffer; size_t size; int error; const char *flags; assert(template_ptr); assert(*template_ptr); assert(exports); file_buffer = *template_ptr; size = strlen(file_buffer) + 1; /* * Assemble pcrs joblist from exports map */ for (m = exports->first; m != NULL; m = m->next) { if (*m->name == '$') { /* * First character of name is '$', so remove this flag * character and allow backreferences ($1 etc) in the * "replace with" text. */ snprintf(buf, BUFFER_SIZE, "%s", m->name + 1); flags = "sigU"; } else { /* * Treat the "replace with" text as a literal string - * no quoting needed, no backreferences allowed. * ("Trivial" ['T'] flag). */ flags = "sigTU"; /* Enclose name in @@ */ snprintf(buf, BUFFER_SIZE, "@%s@", m->name); } log_error(LOG_LEVEL_CGI, "Substituting: s/%s/%s/%s", buf, m->value, flags); /* Make and run job. */ job = pcrs_compile(buf, m->value, flags, &error); if (job == NULL) { if (error == PCRS_ERR_NOMEM) { free(file_buffer); *template_ptr = NULL; return JB_ERR_MEMORY; } else { log_error(LOG_LEVEL_ERROR, "Error compiling template fill job %s: %d", m->name, error); /* Hope it wasn't important and silently ignore the invalid job */ } } else { error = pcrs_execute(job, file_buffer, size, &tmp_out_buffer, &size); pcrs_free_job(job); if (NULL == tmp_out_buffer) { *template_ptr = NULL; return JB_ERR_MEMORY; } if (error < 0) { /* * Substitution failed, keep the original buffer, * log the problem and ignore it. * * The user might see some unresolved @CGI_VARIABLES@, * but returning a special CGI error page seems unreasonable * and could mask more important error messages. */ free(tmp_out_buffer); log_error(LOG_LEVEL_ERROR, "Failed to execute s/%s/%s/%s. %s", buf, m->value, flags, pcrs_strerror(error)); } else { /* Substitution succeeded, use modified buffer. */ free(file_buffer); file_buffer = tmp_out_buffer; } } } /* * Return */ *template_ptr = file_buffer; return JB_ERR_OK; } /********************************************************************* * * Function : template_fill_for_cgi * * Description : CGI support function that loads a HTML template * and fills it in. Handles file-not-found errors * by sending a HTML error message. For convenience, * this function also frees the passed "exports" map. * * Parameters : * 1 : csp = Client state * 2 : templatename = name of the HTML template to be used * 3 : exports = map with fill in symbol -> name pairs. * Will be freed by this function. * 4 : rsp = Response structure to fill in. * * Returns : JB_ERR_OK on success * JB_ERR_MEMORY on out-of-memory error * *********************************************************************/ jb_err template_fill_for_cgi(const struct client_state *csp, const char *templatename, struct map *exports, struct http_response *rsp) { jb_err err; assert(csp); assert(templatename); assert(exports); assert(rsp); err = template_load(csp, &rsp->body, templatename, 0); if (err == JB_ERR_FILE) { free_map(exports); return cgi_error_no_template(csp, rsp, templatename); } else if (err) { free_map(exports); return err; /* JB_ERR_MEMORY */ } err = template_fill(&rsp->body, exports); free_map(exports); return err; } /********************************************************************* * * Function : default_exports * * Description : returns a struct map list that contains exports * which are common to all CGI functions. * * Parameters : * 1 : csp = Current client state (buffers, headers, etc...) * 2 : caller = name of CGI who calls us and which should * be excluded from the generated menu. May be * NULL. * Returns : NULL if no memory, else a new map. Caller frees. * *********************************************************************/ struct map *default_exports(const struct client_state *csp, const char *caller) { char buf[30]; jb_err err; struct map * exports; int local_help_exists = 0; char *ip_address = NULL; char *hostname = NULL; assert(csp); exports = new_map(); if (exports == NULL) { return NULL; } if (csp->config->hostname) { get_host_information(csp->cfd, &ip_address, NULL); hostname = strdup(csp->config->hostname); } else { get_host_information(csp->cfd, &ip_address, &hostname); } err = map(exports, "version", 1, html_encode(VERSION), 0); get_locale_time(buf, sizeof(buf)); if (!err) err = map(exports, "time", 1, html_encode(buf), 0); if (!err) err = map(exports, "my-ip-address", 1, html_encode(ip_address ? ip_address : "unknown"), 0); freez(ip_address); if (!err) err = map(exports, "my-hostname", 1, html_encode(hostname ? hostname : "unknown"), 0); freez(hostname); if (!err) err = map(exports, "homepage", 1, html_encode(HOME_PAGE_URL), 0); if (!err) err = map(exports, "default-cgi", 1, html_encode(CGI_PREFIX), 0); if (!err) err = map(exports, "menu", 1, make_menu(caller, csp->config->feature_flags), 0); if (!err) err = map(exports, "code-status", 1, CODE_STATUS, 1); if (!strncmpic(csp->config->usermanual, "file://", 7) || !strncmpic(csp->config->usermanual, "http", 4)) { /* Manual is located somewhere else, just link to it. */ if (!err) err = map(exports, "user-manual", 1, html_encode(csp->config->usermanual), 0); } else { /* Manual is delivered by Privoxy. */ if (!err) err = map(exports, "user-manual", 1, html_encode(CGI_PREFIX"user-manual/"), 0); } if (!err) err = map(exports, "actions-help-prefix", 1, ACTIONS_HELP_PREFIX ,1); #ifdef FEATURE_TOGGLE if (!err) err = map_conditional(exports, "enabled-display", global_toggle_state); #else if (!err) err = map_block_killer(exports, "can-toggle"); #endif snprintf(buf, sizeof(buf), "%d", csp->config->hport); if (!err) err = map(exports, "my-port", 1, buf, 1); if(!strcmp(CODE_STATUS, "stable")) { if (!err) err = map_block_killer(exports, "unstable"); } if (csp->config->admin_address != NULL) { if (!err) err = map(exports, "admin-address", 1, html_encode(csp->config->admin_address), 0); local_help_exists = 1; } else { if (!err) err = map_block_killer(exports, "have-adminaddr-info"); } if (csp->config->proxy_info_url != NULL) { if (!err) err = map(exports, "proxy-info-url", 1, html_encode(csp->config->proxy_info_url), 0); local_help_exists = 1; } else { if (!err) err = map_block_killer(exports, "have-proxy-info"); } if (local_help_exists == 0) { if (!err) err = map_block_killer(exports, "have-help-info"); } if (err) { free_map(exports); return NULL; } return exports; } /********************************************************************* * * Function : map_block_killer * * Description : Convenience function. * Adds a "killer" for the conditional HTML-template * block , i.e. a substitution of the regex * "if--start.*if--end" to the given * export list. * * Parameters : * 1 : exports = map to extend * 2 : name = name of conditional block * * Returns : JB_ERR_OK on success * JB_ERR_MEMORY on out-of-memory error. * *********************************************************************/ jb_err map_block_killer(struct map *exports, const char *name) { char buf[1000]; /* Will do, since the names are hardwired */ assert(exports); assert(name); assert(strlen(name) < 490); snprintf(buf, sizeof(buf), "if-%s-start.*if-%s-end", name, name); return map(exports, buf, 1, "", 1); } /********************************************************************* * * Function : map_block_keep * * Description : Convenience function. Removes the markers used * by map-block-killer, to save a few bytes. * i.e. removes "@if--start@" and "@if--end@" * * Parameters : * 1 : exports = map to extend * 2 : name = name of conditional block * * Returns : JB_ERR_OK on success * JB_ERR_MEMORY on out-of-memory error. * *********************************************************************/ jb_err map_block_keep(struct map *exports, const char *name) { jb_err err; char buf[500]; /* Will do, since the names are hardwired */ assert(exports); assert(name); assert(strlen(name) < 490); snprintf(buf, sizeof(buf), "if-%s-start", name); err = map(exports, buf, 1, "", 1); if (err) { return err; } snprintf(buf, sizeof(buf), "if-%s-end", name); return map(exports, buf, 1, "", 1); } /********************************************************************* * * Function : map_conditional * * Description : Convenience function. * Adds an "if-then-else" for the conditional HTML-template * block , i.e. a substitution of the form: * @if--then@ * True text * @else-not-@ * False text * @endif-@ * * The control structure and one of the alternatives * will be hidden. * * Parameters : * 1 : exports = map to extend * 2 : name = name of conditional block * 3 : choose_first = nonzero for first, zero for second. * * Returns : JB_ERR_OK on success * JB_ERR_MEMORY on out-of-memory error. * *********************************************************************/ jb_err map_conditional(struct map *exports, const char *name, int choose_first) { char buf[1000]; /* Will do, since the names are hardwired */ jb_err err; assert(exports); assert(name); assert(strlen(name) < 480); snprintf(buf, sizeof(buf), (choose_first ? "else-not-%s@.*@endif-%s" : "if-%s-then@.*@else-not-%s"), name, name); err = map(exports, buf, 1, "", 1); if (err) { return err; } snprintf(buf, sizeof(buf), (choose_first ? "if-%s-then" : "endif-%s"), name); return map(exports, buf, 1, "", 1); } /********************************************************************* * * Function : make_menu * * Description : Returns an HTML-formatted menu of the available * unhidden CGIs, excluding the one given in * and the toggle CGI if toggling is disabled. * * Parameters : * 1 : self = name of CGI to leave out, can be NULL for * complete listing. * 2 : feature_flags = feature bitmap from csp->config * * * Returns : menu string, or NULL on out-of-memory error. * *********************************************************************/ char *make_menu(const char *self, const unsigned feature_flags) { const struct cgi_dispatcher *d; char *result = strdup(""); if (self == NULL) { self = "NO-SUCH-CGI!"; } /* List available unhidden CGI's and export as "other-cgis" */ for (d = cgi_dispatchers; d->name; d++) { #ifdef FEATURE_TOGGLE if (!(feature_flags & RUNTIME_FEATURE_CGI_TOGGLE) && !strcmp(d->name, "toggle")) { /* * Suppress the toggle link if remote toggling is disabled. */ continue; } #endif /* def FEATURE_TOGGLE */ if (d->description && strcmp(d->name, self)) { char *html_encoded_prefix; /* * Line breaks would be great, but break * the "blocked" template's JavaScript. */ string_append(&result, "
  • name); string_append(&result, "\">"); string_append(&result, d->description); string_append(&result, "
  • "); } } return result; } /********************************************************************* * * Function : dump_map * * Description : HTML-dump a map for debugging (as table) * * Parameters : * 1 : the_map = map to dump * * Returns : string with HTML * *********************************************************************/ char *dump_map(const struct map *the_map) { struct map_entry *cur_entry; char *ret = strdup(""); string_append(&ret, "\n"); for (cur_entry = the_map->first; (cur_entry != NULL) && (ret != NULL); cur_entry = cur_entry->next) { string_append(&ret, "\n"); } string_append(&ret, "
    "); string_join (&ret, html_encode(cur_entry->name)); string_append(&ret, ""); string_join (&ret, html_encode(cur_entry->value)); string_append(&ret, "
    \n"); return ret; } /* Local Variables: tab-width: 3 end: */