1 const char cgi_rcs[] = "$Id: cgi.c,v 1.165 2016/05/03 13:22:30 fabiankeil Exp $";
2 /*********************************************************************
4 * File : $Source: /cvsroot/ijbswa/current/cgi.c,v $
6 * Purpose : Declares functions to intercept request, generate
7 * html or gif answers, and to compose HTTP resonses.
8 * This only contains the framework functions, the
9 * actual handler functions are declared elsewhere.
11 * Copyright : Written by and Copyright (C) 2001-2004, 2006-2008
12 * members of the Privoxy team. http://www.privoxy.org/
14 * Based on the Internet Junkbuster originally written
15 * by and Copyright (C) 1997 Anonymous Coders and
16 * Junkbusters Corporation. http://www.junkbusters.com
18 * This program is free software; you can redistribute it
19 * and/or modify it under the terms of the GNU General
20 * Public License as published by the Free Software
21 * Foundation; either version 2 of the License, or (at
22 * your option) any later version.
24 * This program is distributed in the hope that it will
25 * be useful, but WITHOUT ANY WARRANTY; without even the
26 * implied warranty of MERCHANTABILITY or FITNESS FOR A
27 * PARTICULAR PURPOSE. See the GNU General Public
28 * License for more details.
30 * The GNU General Public License should be included with
31 * this file. If not, you can view it at
32 * http://www.gnu.org/copyleft/gpl.html
33 * or write to the Free Software Foundation, Inc., 59
34 * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
36 **********************************************************************/
42 #include <sys/types.h>
49 #ifdef FEATURE_COMPRESSION
61 #include "cgisimple.h"
62 #include "jbsockets.h"
63 #if defined(FEATURE_CGI_EDIT_ACTIONS) || defined(FEATURE_TOGGLE)
65 #endif /* defined(FEATURE_CGI_EDIT_ACTIONS) || defined (FEATURE_TOGGLE) */
67 /* loadcfg.h is for global_toggle_state only */
69 /* jcc.h is for mutex semaphore globals only */
72 const char cgi_h_rcs[] = CGI_H_VERSION;
75 * List of CGI functions: name, handler, description
76 * Note: Do NOT use single quotes in the description;
77 * this will break the dynamic "blocked" template!
79 static const struct cgi_dispatcher cgi_dispatchers[] = {
84 #ifdef FEATURE_GRACEFUL_TERMINATION
87 "<b>Shut down</b> - <em class=\"warning\">Do not deploy this build in a production environment, "
88 "this is a one click Denial Of Service attack!!!</em>",
93 #ifdef FEATURE_CGI_EDIT_ACTIONS
94 "View & change the current configuration",
96 "View the current configuration",
101 "View the source code version numbers",
103 #ifdef FEATURE_CLIENT_TAGS
105 cgi_show_client_tags,
106 "View or toggle the tags that can be set based on the clients address",
111 "View the request headers",
115 "Look up which actions apply to a URL and why",
117 #ifdef FEATURE_TOGGLE
120 "Toggle Privoxy on or off",
122 #endif /* def FEATURE_TOGGLE */
123 #ifdef FEATURE_CGI_EDIT_ACTIONS
124 { "edit-actions", /* Edit the actions list */
127 { "eaa", /* Shortcut for edit-actions-add-url-form */
128 cgi_edit_actions_add_url_form,
130 { "eau", /* Shortcut for edit-actions-url-form */
131 cgi_edit_actions_url_form,
133 { "ear", /* Shortcut for edit-actions-remove-url-form */
134 cgi_edit_actions_remove_url_form,
136 { "eal", /* Shortcut for edit-actions-list */
137 cgi_edit_actions_list,
139 { "eafu", /* Shortcut for edit-actions-for-url */
140 cgi_edit_actions_for_url,
142 { "eas", /* Shortcut for edit-actions-submit */
143 cgi_edit_actions_submit,
145 { "easa", /* Shortcut for edit-actions-section-add */
146 cgi_edit_actions_section_add,
148 { "easr", /* Shortcut for edit-actions-section-remove */
149 cgi_edit_actions_section_remove,
151 { "eass", /* Shortcut for edit-actions-section-swap */
152 cgi_edit_actions_section_swap,
154 { "edit-actions-for-url",
155 cgi_edit_actions_for_url,
156 NULL, FALSE /* Edit the actions for (a) specified URL(s) */ },
157 { "edit-actions-list",
158 cgi_edit_actions_list,
159 NULL, TRUE /* Edit the actions list */ },
160 { "edit-actions-submit",
161 cgi_edit_actions_submit,
162 NULL, FALSE /* Change the actions for (a) specified URL(s) */ },
163 { "edit-actions-url",
164 cgi_edit_actions_url,
165 NULL, FALSE /* Change a URL pattern in the actionsfile */ },
166 { "edit-actions-url-form",
167 cgi_edit_actions_url_form,
168 NULL, FALSE /* Form to change a URL pattern in the actionsfile */ },
169 { "edit-actions-add-url",
170 cgi_edit_actions_add_url,
171 NULL, FALSE /* Add a URL pattern to the actionsfile */ },
172 { "edit-actions-add-url-form",
173 cgi_edit_actions_add_url_form,
174 NULL, FALSE /* Form to add a URL pattern to the actionsfile */ },
175 { "edit-actions-remove-url",
176 cgi_edit_actions_remove_url,
177 NULL, FALSE /* Remove a URL pattern from the actionsfile */ },
178 { "edit-actions-remove-url-form",
179 cgi_edit_actions_remove_url_form,
180 NULL, FALSE /* Form to remove a URL pattern from the actionsfile */ },
181 { "edit-actions-section-add",
182 cgi_edit_actions_section_add,
183 NULL, FALSE /* Remove a section from the actionsfile */ },
184 { "edit-actions-section-remove",
185 cgi_edit_actions_section_remove,
186 NULL, FALSE /* Remove a section from the actionsfile */ },
187 { "edit-actions-section-swap",
188 cgi_edit_actions_section_swap,
189 NULL, FALSE /* Swap two sections in the actionsfile */ },
190 #endif /* def FEATURE_CGI_EDIT_ACTIONS */
191 { "error-favicon.ico",
192 cgi_send_error_favicon,
193 NULL, TRUE /* Sends the favicon image for error pages. */ },
195 cgi_send_default_favicon,
196 NULL, TRUE /* Sends the default favicon image. */ },
199 NULL, TRUE /* Sends a robots.txt file to tell robots to go away. */ },
202 NULL, TRUE /* Send a built-in image */ },
205 NULL, FALSE /* Send templates/cgi-style.css */ },
207 cgi_transparent_image,
208 NULL, TRUE /* Send a transparent image (short name) */ },
209 { "url-info-osd.xml",
210 cgi_send_url_info_osd,
211 NULL, TRUE /* Send templates/url-info-osd.xml */ },
213 cgi_send_user_manual,
214 NULL, TRUE /* Send user-manual */ },
215 { NULL, /* NULL Indicates end of list and default page */
217 NULL, TRUE /* Unknown CGI page */ }
222 * Built-in images for ad replacement
224 * Hint: You can encode your own images like this:
225 * cat your-image | perl -e 'while (read STDIN, $c, 1) { printf("\\%.3o", unpack("C", $c)); }'
228 #ifdef FEATURE_NO_GIFS
231 * Checkerboard pattern, as a PNG.
233 const char image_pattern_data[] =
234 "\211\120\116\107\015\012\032\012\000\000\000\015\111\110\104"
235 "\122\000\000\000\004\000\000\000\004\010\006\000\000\000\251"
236 "\361\236\176\000\000\000\006\142\113\107\104\000\000\000\000"
237 "\000\000\371\103\273\177\000\000\000\033\111\104\101\124\010"
238 "\327\143\140\140\140\060\377\377\377\077\003\234\106\341\060"
239 "\060\230\063\020\124\001\000\161\021\031\241\034\364\030\143"
240 "\000\000\000\000\111\105\116\104\256\102\140\202";
243 * 1x1 transparant PNG.
245 const char image_blank_data[] =
246 "\211\120\116\107\015\012\032\012\000\000\000\015\111\110\104\122"
247 "\000\000\000\001\000\000\000\001\001\003\000\000\000\045\333\126"
248 "\312\000\000\000\003\120\114\124\105\377\377\377\247\304\033\310"
249 "\000\000\000\001\164\122\116\123\000\100\346\330\146\000\000\000"
250 "\001\142\113\107\104\000\210\005\035\110\000\000\000\012\111\104"
251 "\101\124\170\001\143\140\000\000\000\002\000\001\163\165\001\030"
252 "\000\000\000\000\111\105\116\104\256\102\140\202";
256 * Checkerboard pattern, as a GIF.
258 const char image_pattern_data[] =
259 "\107\111\106\070\071\141\004\000\004\000\200\000\000\310\310"
260 "\310\377\377\377\041\376\016\111\040\167\141\163\040\141\040"
261 "\142\141\156\156\145\162\000\041\371\004\001\012\000\001\000"
262 "\054\000\000\000\000\004\000\004\000\000\002\005\104\174\147"
266 * 1x1 transparant GIF.
268 const char image_blank_data[] =
269 "GIF89a\001\000\001\000\200\000\000\377\377\377\000\000"
270 "\000!\371\004\001\000\000\000\000,\000\000\000\000\001"
271 "\000\001\000\000\002\002D\001\000;";
274 const size_t image_pattern_length = sizeof(image_pattern_data) - 1;
275 const size_t image_blank_length = sizeof(image_blank_data) - 1;
277 #ifdef FEATURE_COMPRESSION
279 * Minimum length which a buffer has to reach before
280 * we bother to (re-)compress it. Completely arbitrary.
282 const size_t LOWER_LENGTH_LIMIT_FOR_COMPRESSION = 1024U;
285 static struct http_response cgi_error_memory_response[1];
287 static struct http_response *dispatch_known_cgi(struct client_state * csp,
289 static struct map *parse_cgi_parameters(char *argstring);
292 /*********************************************************************
294 * Function : dispatch_cgi
296 * Description : Checks if a request URL has either the magical
297 * hostname CGI_SITE_1_HOST (usually http://p.p/) or
298 * matches CGI_SITE_2_HOST CGI_SITE_2_PATH (usually
299 * http://config.privoxy.org/). If so, it passes
300 * the (rest of the) path onto dispatch_known_cgi, which
301 * calls the relevant CGI handler function.
304 * 1 : csp = Current client state (buffers, headers, etc...)
306 * Returns : http_response if match, NULL if nonmatch or handler fail
308 *********************************************************************/
309 struct http_response *dispatch_cgi(struct client_state *csp)
311 const char *host = csp->http->host;
312 const char *path = csp->http->path;
315 * Should we intercept ?
318 /* Note: "example.com" and "example.com." are equivalent hostnames. */
320 /* Either the host matches CGI_SITE_1_HOST ..*/
321 if ( ( (0 == strcmpic(host, CGI_SITE_1_HOST))
322 || (0 == strcmpic(host, CGI_SITE_1_HOST ".")))
325 /* ..then the path will all be for us. Remove leading '/' */
328 /* Or it's the host part CGI_SITE_2_HOST, and the path CGI_SITE_2_PATH */
329 else if (( (0 == strcmpic(host, CGI_SITE_2_HOST))
330 || (0 == strcmpic(host, CGI_SITE_2_HOST ".")))
331 && (0 == strncmpic(path, CGI_SITE_2_PATH, strlen(CGI_SITE_2_PATH))))
333 /* take everything following CGI_SITE_2_PATH */
334 path += strlen(CGI_SITE_2_PATH);
337 /* skip the forward slash after CGI_SITE_2_PATH */
340 else if (*path != '\0')
343 * weirdness: URL is /configXXX, where XXX is some string
344 * Do *NOT* intercept.
355 if (strcmpic(csp->http->gpc, "GET")
356 && strcmpic(csp->http->gpc, "HEAD"))
358 log_error(LOG_LEVEL_ERROR,
359 "CGI request with unsupported method received: %s", csp->http->gpc);
361 * The CGI pages currently only support GET and HEAD requests.
363 * If the client used a different method, ditch any data following
364 * the current headers to reduce the likelihood of parse errors
365 * with the following request.
367 csp->client_iob->eod = csp->client_iob->cur;
371 * This is a CGI call.
374 return dispatch_known_cgi(csp, path);
378 /*********************************************************************
380 * Function : grep_cgi_referrer
382 * Description : Ugly provisorical fix that greps the value of the
383 * referer HTTP header field out of a linked list of
384 * strings like found at csp->headers. Will disappear
387 * FIXME: csp->headers ought to be csp->http->headers
388 * FIXME: Parsing all client header lines should
389 * happen right after the request is received!
392 * 1 : csp = Current client state (buffers, headers, etc...)
394 * Returns : pointer to value (no copy!), or NULL if none found.
396 *********************************************************************/
397 static char *grep_cgi_referrer(const struct client_state *csp)
399 struct list_entry *p;
401 for (p = csp->headers->first; p != NULL; p = p->next)
403 if (p->str == NULL) continue;
404 if (strncmpic(p->str, "Referer: ", 9) == 0)
406 return ((p->str) + 9);
414 /*********************************************************************
416 * Function : referrer_is_safe
418 * Description : Decides whether we trust the Referer for
419 * CGI pages which are only meant to be reachable
420 * through Privoxy's web interface directly.
423 * 1 : csp = Current client state (buffers, headers, etc...)
425 * Returns : TRUE if the referrer is safe, or
426 * FALSE if the referrer is unsafe or not set.
428 *********************************************************************/
429 static int referrer_is_safe(const struct client_state *csp)
432 static const char alternative_prefix[] = "http://" CGI_SITE_1_HOST "/";
434 referrer = grep_cgi_referrer(csp);
436 if (NULL == referrer)
438 /* No referrer, no access */
439 log_error(LOG_LEVEL_ERROR, "Denying access to %s. No referrer found.",
442 else if ((0 == strncmp(referrer, CGI_PREFIX, sizeof(CGI_PREFIX)-1)
443 || (0 == strncmp(referrer, alternative_prefix, strlen(alternative_prefix)))))
445 /* Trustworthy referrer */
446 log_error(LOG_LEVEL_CGI, "Granting access to %s, referrer %s is trustworthy.",
447 csp->http->url, referrer);
453 /* Untrustworthy referrer */
454 log_error(LOG_LEVEL_ERROR, "Denying access to %s, referrer %s isn't trustworthy.",
455 csp->http->url, referrer);
462 /*********************************************************************
464 * Function : dispatch_known_cgi
466 * Description : Processes a CGI once dispatch_cgi has determined that
467 * it matches one of the magic prefixes. Parses the path
468 * as a cgi name plus query string, prepares a map that
469 * maps CGI parameter names to their values, initializes
470 * the http_response struct, and calls the relevant CGI
474 * 1 : csp = Current client state (buffers, headers, etc...)
475 * 2 : path = Path of CGI, with the CGI prefix removed.
476 * Should not have a leading "/".
478 * Returns : http_response, or NULL on handler failure or out of
481 *********************************************************************/
482 static struct http_response *dispatch_known_cgi(struct client_state * csp,
485 const struct cgi_dispatcher *d;
486 struct map *param_list;
487 struct http_response *rsp;
488 char *query_args_start;
492 if (NULL == (path_copy = strdup(path)))
494 return cgi_error_memory();
496 query_args_start = path_copy;
497 while (*query_args_start && *query_args_start != '?' && *query_args_start != '/')
501 if (*query_args_start == '/')
503 *query_args_start++ = '\0';
504 param_list = new_map();
505 err = map(param_list, "file", 1, url_decode(query_args_start), 0);
506 if (JB_ERR_OK != err) {
509 return cgi_error_memory();
514 if (*query_args_start == '?')
516 *query_args_start++ = '\0';
518 if (NULL == (param_list = parse_cgi_parameters(query_args_start)))
521 return cgi_error_memory();
527 * path_copy = CGI call name
528 * param_list = CGI params, as map
531 /* Get mem for response or fail*/
532 if (NULL == (rsp = alloc_http_response()))
535 free_map(param_list);
536 return cgi_error_memory();
540 * Find and start the right CGI function
545 if ((d->name == NULL) || (strcmp(path_copy, d->name) == 0))
548 * If the called CGI is either harmless, or referred
549 * from a trusted source, start it.
551 if (d->harmless || referrer_is_safe(csp))
553 err = (d->handler)(csp, rsp, param_list);
558 * Else, modify toggle calls so that they only display
559 * the status, and deny all other calls.
561 if (0 == strcmp(path_copy, "toggle"))
563 unmap(param_list, "set");
564 err = (d->handler)(csp, rsp, param_list);
568 err = cgi_error_disabled(csp, rsp);
573 free_map(param_list);
575 if (err == JB_ERR_CGI_PARAMS)
577 err = cgi_error_bad_param(csp, rsp);
579 if (err && (err != JB_ERR_MEMORY))
581 /* Unexpected error! Shouldn't get here */
582 log_error(LOG_LEVEL_ERROR,
583 "Unexpected CGI error %d in top-level handler. "
584 "Please file a bug report!", err);
585 err = cgi_error_unknown(csp, rsp, err);
590 rsp->crunch_reason = CGI_CALL;
591 return finish_http_response(csp, rsp);
595 /* Error in handler, probably out-of-memory */
596 free_http_response(rsp);
597 return cgi_error_memory();
605 /*********************************************************************
607 * Function : parse_cgi_parameters
609 * Description : Parse a URL-encoded argument string into name/value
610 * pairs and store them in a struct map list.
613 * 1 : argstring = string to be parsed. Will be trashed.
615 * Returns : pointer to param list, or NULL if out of memory.
617 *********************************************************************/
618 static struct map *parse_cgi_parameters(char *argstring)
623 struct map *cgi_params;
626 * XXX: This estimate is guaranteed to be high enough as we
627 * let ssplit() ignore empty fields, but also a bit wasteful.
628 * The same hack is used in get_last_url() so it looks like
629 * a real solution is needed.
631 size_t max_segments = strlen(argstring) / 2;
632 if (max_segments == 0)
635 * XXX: If the argstring is empty, there's really
636 * no point in creating a param list, but currently
637 * other parts of Privoxy depend on the list's existence.
641 vector = malloc_or_die(max_segments * sizeof(char *));
643 cgi_params = new_map();
646 * IE 5 does, of course, violate RFC 2316 Sect 4.1 and sends
647 * the fragment identifier along with the request, so we must
648 * cut it off here, so it won't pollute the CGI params:
650 if (NULL != (p = strchr(argstring, '#')))
655 pairs = ssplit(argstring, "&", vector, max_segments);
660 free_map(cgi_params);
664 for (i = 0; i < pairs; i++)
666 if ((NULL != (p = strchr(vector[i], '='))) && (*(p+1) != '\0'))
669 if (map(cgi_params, url_decode(vector[i]), 0, url_decode(++p), 0))
672 free_map(cgi_params);
685 /*********************************************************************
687 * Function : get_char_param
689 * Description : Get a single-character parameter passed to a CGI
693 * 1 : parameters = map of cgi parameters
694 * 2 : param_name = The name of the parameter to read
696 * Returns : Uppercase character on success, '\0' on error.
698 *********************************************************************/
699 char get_char_param(const struct map *parameters,
700 const char *param_name)
707 ch = *(lookup(parameters, param_name));
708 if ((ch >= 'a') && (ch <= 'z'))
710 ch = (char)(ch - 'a' + 'A');
717 /*********************************************************************
719 * Function : get_string_param
721 * Description : Get a string paramater, to be used as an
722 * ACTION_STRING or ACTION_MULTI paramater.
723 * Validates the input to prevent stupid/malicious
724 * users from corrupting their action file.
727 * 1 : parameters = map of cgi parameters
728 * 2 : param_name = The name of the parameter to read
729 * 3 : pparam = destination for paramater. Allocated as
730 * part of the map "parameters", so don't free it.
731 * Set to NULL if not specified.
733 * Returns : JB_ERR_OK on success, or if the paramater
735 * JB_ERR_MEMORY on out-of-memory.
736 * JB_ERR_CGI_PARAMS if the paramater is not valid.
738 *********************************************************************/
739 jb_err get_string_param(const struct map *parameters,
740 const char *param_name,
753 param = lookup(parameters, param_name);
759 if (strlen(param) >= CGI_PARAM_LEN_MAX)
764 * Note that the length limit is arbitrary, it just seems
765 * sensible to limit it to *something*. There's no
766 * technical reason for any limit at all.
768 return JB_ERR_CGI_PARAMS;
771 /* Check every character to see if it's legal */
773 while ((ch = *s++) != '\0')
775 if (((unsigned char)ch < (unsigned char)' ')
778 /* Probable hack attempt, or user accidentally used '}'. */
779 return JB_ERR_CGI_PARAMS;
790 /*********************************************************************
792 * Function : get_number_param
794 * Description : Get a non-negative integer from the parameters
795 * passed to a CGI function.
798 * 1 : csp = Current client state (buffers, headers, etc...)
799 * 2 : parameters = map of cgi parameters
800 * 3 : name = Name of CGI parameter to read
801 * 4 : pvalue = destination for value.
802 * Set to -1 on error.
804 * Returns : JB_ERR_OK on success
805 * JB_ERR_MEMORY on out-of-memory
806 * JB_ERR_CGI_PARAMS if the parameter was not specified
809 *********************************************************************/
810 jb_err get_number_param(struct client_state *csp,
811 const struct map *parameters,
825 param = lookup(parameters, name);
828 return JB_ERR_CGI_PARAMS;
831 *pvalue = (unsigned int)strtol(param, &endptr, 0);
834 return JB_ERR_CGI_PARAMS;
842 /*********************************************************************
844 * Function : error_response
846 * Description : returns an http_response that explains the reason
847 * why a request failed.
850 * 1 : csp = Current client state (buffers, headers, etc...)
851 * 2 : templatename = Which template should be used for the answer
853 * Returns : A http_response. If we run out of memory, this
854 * will be cgi_error_memory().
856 *********************************************************************/
857 struct http_response *error_response(struct client_state *csp,
858 const char *templatename)
861 struct http_response *rsp;
862 struct map *exports = default_exports(csp, NULL);
867 return cgi_error_memory();
870 if (NULL == (rsp = alloc_http_response()))
873 return cgi_error_memory();
876 #ifdef FEATURE_FORCE_LOAD
877 if (csp->flags & CSP_FLAG_FORCED)
879 path = strdup(FORCE_PREFIX);
882 #endif /* def FEATURE_FORCE_LOAD */
886 err = string_append(&path, csp->http->path);
888 if (!err) err = map(exports, "host", 1, html_encode(csp->http->host), 0);
889 if (!err) err = map(exports, "hostport", 1, html_encode(csp->http->hostport), 0);
890 if (!err) err = map(exports, "path", 1, html_encode_and_free_original(path), 0);
891 if (!err) err = map(exports, "protocol", 1, csp->http->ssl ? "https://" : "http://", 1);
894 err = map(exports, "host-ip", 1, html_encode(csp->http->host_ip_addr_str), 0);
897 /* Some failures, like "404 no such domain", don't have an IP address. */
898 err = map(exports, "host-ip", 1, html_encode(csp->http->host), 0);
906 free_http_response(rsp);
907 return cgi_error_memory();
910 if (!strcmp(templatename, "no-such-domain"))
912 rsp->status = strdup("404 No such domain");
913 rsp->crunch_reason = NO_SUCH_DOMAIN;
915 else if (!strcmp(templatename, "forwarding-failed"))
917 const struct forward_spec *fwd = forward_url(csp, csp->http);
918 char *socks_type = NULL;
921 log_error(LOG_LEVEL_FATAL, "gateway spec is NULL. This shouldn't happen!");
922 /* Never get here - LOG_LEVEL_FATAL causes program exit */
926 * XXX: While the template is called forwarding-failed,
927 * it currently only handles socks forwarding failures.
930 assert(fwd->type != SOCKS_NONE);
933 * Map failure reason, forwarding type and forwarder.
935 if (NULL == csp->error_message)
938 * Either we forgot to record the failure reason,
939 * or the memory allocation failed.
941 log_error(LOG_LEVEL_ERROR, "Socks failure reason missing.");
942 csp->error_message = strdup("Failure reason missing. Check the log file for details.");
944 if (!err) err = map(exports, "gateway", 1, fwd->gateway_host, 1);
947 * XXX: this is almost the same code as in cgi_show_url_info()
948 * and thus should be factored out and shared.
953 socks_type = "socks4-";
956 socks_type = "socks4a-";
959 socks_type = "socks5-";
962 socks_type = "socks5t-";
965 log_error(LOG_LEVEL_FATAL, "Unknown socks type: %d.", fwd->type);
968 if (!err) err = map(exports, "forwarding-type", 1, socks_type, 1);
969 if (!err) err = map(exports, "error-message", 1, html_encode(csp->error_message), 0);
970 if ((NULL == csp->error_message) || err)
973 free_http_response(rsp);
974 return cgi_error_memory();
977 rsp->status = strdup("503 Forwarding failure");
978 rsp->crunch_reason = FORWARDING_FAILED;
980 else if (!strcmp(templatename, "connect-failed"))
982 rsp->status = strdup("503 Connect failed");
983 rsp->crunch_reason = CONNECT_FAILED;
985 else if (!strcmp(templatename, "connection-timeout"))
987 rsp->status = strdup("504 Connection timeout");
988 rsp->crunch_reason = CONNECTION_TIMEOUT;
990 else if (!strcmp(templatename, "no-server-data"))
992 rsp->status = strdup("502 No data received from server or forwarder");
993 rsp->crunch_reason = NO_SERVER_DATA;
996 if (rsp->status == NULL)
999 free_http_response(rsp);
1000 return cgi_error_memory();
1003 err = template_fill_for_cgi(csp, templatename, exports, rsp);
1006 free_http_response(rsp);
1007 return cgi_error_memory();
1010 return finish_http_response(csp, rsp);
1014 /*********************************************************************
1016 * Function : cgi_error_disabled
1018 * Description : CGI function that is called to generate an error
1019 * response if the actions editor or toggle CGI are
1020 * accessed despite having being disabled at compile-
1021 * or run-time, or if the user followed an untrusted link
1022 * to access a unsafe CGI feature that is only reachable
1023 * through Privoxy directly.
1026 * 1 : csp = Current client state (buffers, headers, etc...)
1027 * 2 : rsp = http_response data structure for output
1029 * CGI Parameters : none
1031 * Returns : JB_ERR_OK on success
1032 * JB_ERR_MEMORY on out-of-memory error.
1034 *********************************************************************/
1035 jb_err cgi_error_disabled(const struct client_state *csp,
1036 struct http_response *rsp)
1038 struct map *exports;
1043 if (NULL == (exports = default_exports(csp, "cgi-error-disabled")))
1045 return JB_ERR_MEMORY;
1047 if (map(exports, "url", 1, html_encode(csp->http->url), 0))
1049 /* Not important enough to do anything */
1050 log_error(LOG_LEVEL_ERROR, "Failed to fill in url.");
1053 return template_fill_for_cgi(csp, "cgi-error-disabled", exports, rsp);
1057 /*********************************************************************
1059 * Function : cgi_init_error_messages
1061 * Description : Call at the start of the program to initialize
1062 * the error message used by cgi_error_memory().
1068 *********************************************************************/
1069 void cgi_init_error_messages(void)
1071 memset(cgi_error_memory_response, '\0', sizeof(*cgi_error_memory_response));
1072 cgi_error_memory_response->head =
1073 "HTTP/1.0 500 Internal Privoxy Error\r\n"
1074 "Content-Type: text/html\r\n"
1076 cgi_error_memory_response->body =
1079 " <title>500 Internal Privoxy Error</title>\n"
1080 " <link rel=\"shortcut icon\" href=\"" CGI_PREFIX "error-favicon.ico\" type=\"image/x-icon\">"
1083 "<h1>500 Internal Privoxy Error</h1>\n"
1084 "<p>Privoxy <b>ran out of memory</b> while processing your request.</p>\n"
1085 "<p>Please contact your proxy administrator, or try again later</p>\n"
1089 cgi_error_memory_response->head_length =
1090 strlen(cgi_error_memory_response->head);
1091 cgi_error_memory_response->content_length =
1092 strlen(cgi_error_memory_response->body);
1093 cgi_error_memory_response->crunch_reason = OUT_OF_MEMORY;
1097 /*********************************************************************
1099 * Function : cgi_error_memory
1101 * Description : Called if a CGI function runs out of memory.
1102 * Returns a statically-allocated error response.
1106 * Returns : http_response data structure for output. This is
1107 * statically allocated, for obvious reasons.
1109 *********************************************************************/
1110 struct http_response *cgi_error_memory(void)
1112 /* assert that it's been initialized. */
1113 assert(cgi_error_memory_response->head);
1115 return cgi_error_memory_response;
1119 /*********************************************************************
1121 * Function : cgi_error_no_template
1123 * Description : Almost-CGI function that is called if a template
1124 * cannot be loaded. Note this is not a true CGI,
1125 * it takes a template name rather than a map of
1129 * 1 : csp = Current client state (buffers, headers, etc...)
1130 * 2 : rsp = http_response data structure for output
1131 * 3 : template_name = Name of template that could not
1134 * Returns : JB_ERR_OK on success
1135 * JB_ERR_MEMORY on out-of-memory error.
1137 *********************************************************************/
1138 jb_err cgi_error_no_template(const struct client_state *csp,
1139 struct http_response *rsp,
1140 const char *template_name)
1142 static const char status[] =
1143 "500 Internal Privoxy Error";
1144 static const char body_prefix[] =
1147 " <title>500 Internal Privoxy Error</title>\n"
1148 " <link rel=\"shortcut icon\" href=\"" CGI_PREFIX "error-favicon.ico\" type=\"image/x-icon\">"
1151 "<h1>500 Internal Privoxy Error</h1>\n"
1152 "<p>Privoxy encountered an error while processing your request:</p>\n"
1153 "<p><b>Could not load template file <code>";
1154 static const char body_suffix[] =
1155 "</code> or one of its included components.</b></p>\n"
1156 "<p>Please contact your proxy administrator.</p>\n"
1157 "<p>If you are the proxy administrator, please put the required file(s)"
1158 "in the <code><i>(confdir)</i>/templates</code> directory. The "
1159 "location of the <code><i>(confdir)</i></code> directory "
1160 "is specified in the main Privoxy <code>config</code> "
1161 "file. (It's typically the Privoxy install directory"
1163 ", or <code>/etc/privoxy/</code>"
1164 #endif /* ndef _WIN32 */
1168 const size_t body_size = strlen(body_prefix) + strlen(template_name) + strlen(body_suffix) + 1;
1172 assert(template_name);
1174 /* Reset rsp, if needed */
1178 rsp->content_length = 0;
1179 rsp->head_length = 0;
1182 rsp->body = malloc_or_die(body_size);
1183 strlcpy(rsp->body, body_prefix, body_size);
1184 strlcat(rsp->body, template_name, body_size);
1185 strlcat(rsp->body, body_suffix, body_size);
1187 rsp->status = strdup(status);
1188 if (rsp->status == NULL)
1190 return JB_ERR_MEMORY;
1197 /*********************************************************************
1199 * Function : cgi_error_unknown
1201 * Description : Almost-CGI function that is called if an unexpected
1202 * error occurs in the top-level CGI dispatcher.
1203 * In this context, "unexpected" means "anything other
1204 * than JB_ERR_MEMORY or JB_ERR_CGI_PARAMS" - CGIs are
1205 * expected to handle all other errors internally,
1206 * since they can give more relavent error messages
1209 * Note this is not a true CGI, it takes an error
1210 * code rather than a map of parameters.
1213 * 1 : csp = Current client state (buffers, headers, etc...)
1214 * 2 : rsp = http_response data structure for output
1215 * 3 : error_to_report = Error code to report.
1217 * Returns : JB_ERR_OK on success
1218 * JB_ERR_MEMORY on out-of-memory error.
1220 *********************************************************************/
1221 jb_err cgi_error_unknown(const struct client_state *csp,
1222 struct http_response *rsp,
1223 jb_err error_to_report)
1225 static const char status[] =
1226 "500 Internal Privoxy Error";
1227 static const char body_prefix[] =
1230 " <title>500 Internal Privoxy Error</title>\n"
1231 " <link rel=\"shortcut icon\" href=\"" CGI_PREFIX "error-favicon.ico\" type=\"image/x-icon\">"
1234 "<h1>500 Internal Privoxy Error</h1>\n"
1235 "<p>Privoxy encountered an error while processing your request:</p>\n"
1236 "<p><b>Unexpected internal error: ";
1237 static const char body_suffix[] =
1240 "<a href=\"http://sourceforge.net/tracker/?group_id=11118&atid=111118\">"
1241 "file a bug report</a>.</p>\n"
1244 /* Includes room for larger error numbers in the future. */
1245 const size_t body_size = sizeof(body_prefix) + sizeof(body_suffix) + 5;
1249 /* Reset rsp, if needed */
1253 rsp->content_length = 0;
1254 rsp->head_length = 0;
1256 rsp->crunch_reason = INTERNAL_ERROR;
1258 rsp->body = malloc_or_die(body_size);
1260 snprintf(rsp->body, body_size, "%s%d%s", body_prefix, error_to_report, body_suffix);
1262 rsp->status = strdup(status);
1263 if (rsp->status == NULL)
1265 return JB_ERR_MEMORY;
1272 /*********************************************************************
1274 * Function : cgi_error_bad_param
1276 * Description : CGI function that is called if the parameters
1277 * (query string) for a CGI were wrong.
1280 * 1 : csp = Current client state (buffers, headers, etc...)
1281 * 2 : rsp = http_response data structure for output
1283 * CGI Parameters : none
1285 * Returns : JB_ERR_OK on success
1286 * JB_ERR_MEMORY on out-of-memory error.
1288 *********************************************************************/
1289 jb_err cgi_error_bad_param(const struct client_state *csp,
1290 struct http_response *rsp)
1292 struct map *exports;
1297 if (NULL == (exports = default_exports(csp, NULL)))
1299 return JB_ERR_MEMORY;
1302 return template_fill_for_cgi(csp, "cgi-error-bad-param", exports, rsp);
1306 /*********************************************************************
1308 * Function : cgi_redirect
1310 * Description : CGI support function to generate a HTTP redirect
1314 * 1 : rsp = http_response data structure for output
1315 * 2 : target = string with the target URL
1317 * CGI Parameters : None
1319 * Returns : JB_ERR_OK on success
1320 * JB_ERR_MEMORY on out-of-memory error.
1322 *********************************************************************/
1323 jb_err cgi_redirect (struct http_response * rsp, const char *target)
1330 err = enlist_unique_header(rsp->headers, "Location", target);
1332 rsp->status = strdup("302 Local Redirect from Privoxy");
1333 if (rsp->status == NULL)
1335 return JB_ERR_MEMORY;
1342 /*********************************************************************
1344 * Function : add_help_link
1346 * Description : Produce a copy of the string given as item,
1347 * embedded in an HTML link to its corresponding
1348 * section (item name in uppercase) in the actions
1349 * chapter of the user manual, (whose URL is given in
1350 * the config and defaults to our web site).
1352 * FIXME: I currently only work for actions, and would
1353 * like to be generalized for other topics.
1356 * 1 : item = item (will NOT be free()d.)
1357 * It is assumed to be HTML-safe.
1358 * 2 : config = The current configuration.
1360 * Returns : String with item embedded in link, or NULL on
1363 *********************************************************************/
1364 char *add_help_link(const char *item,
1365 struct configuration_spec *config)
1369 if (!item) return NULL;
1371 result = strdup("<a href=\"");
1372 if (!strncmpic(config->usermanual, "file://", 7) ||
1373 !strncmpic(config->usermanual, "http", 4))
1375 string_append(&result, config->usermanual);
1379 string_append(&result, "https://");
1380 string_append(&result, CGI_SITE_2_HOST);
1381 string_append(&result, "/user-manual/");
1383 string_append(&result, ACTIONS_HELP_PREFIX);
1384 string_join (&result, string_toupper(item));
1385 string_append(&result, "\">");
1386 string_append(&result, item);
1387 string_append(&result, "</a>");
1393 /*********************************************************************
1395 * Function : get_http_time
1397 * Description : Get the time in a format suitable for use in a
1398 * HTTP header - e.g.:
1399 * "Sun, 06 Nov 1994 08:49:37 GMT"
1402 * 1 : time_offset = Time returned will be current time
1403 * plus this number of seconds.
1404 * 2 : buf = Destination for result.
1405 * 3 : buffer_size = Size of the buffer above. Must be big
1406 * enough to hold 29 characters plus a
1411 *********************************************************************/
1412 void get_http_time(int time_offset, char *buf, size_t buffer_size)
1415 time_t current_time;
1416 #if defined(HAVE_GMTIME_R)
1421 assert(buffer_size > (size_t)29);
1423 time(¤t_time);
1425 current_time += time_offset;
1427 /* get and save the gmt */
1429 t = gmtime_r(¤t_time, &dummy);
1430 #elif defined(MUTEX_LOCKS_AVAILABLE)
1431 privoxy_mutex_lock(&gmtime_mutex);
1432 t = gmtime(¤t_time);
1433 privoxy_mutex_unlock(&gmtime_mutex);
1435 t = gmtime(¤t_time);
1438 strftime(buf, buffer_size, "%a, %d %b %Y %H:%M:%S GMT", t);
1442 /*********************************************************************
1444 * Function : get_locale_time
1446 * Description : Get the time in a date(1)-like format
1447 * according to the current locale - e.g.:
1448 * "Fri Aug 29 19:37:12 CEST 2008"
1450 * XXX: Should we allow the user to change the format?
1453 * 1 : buf = Destination for result.
1454 * 2 : buffer_size = Size of the buffer above. Must be big
1455 * enough to hold 29 characters plus a
1460 *********************************************************************/
1461 static void get_locale_time(char *buf, size_t buffer_size)
1464 time_t current_time;
1465 #if defined(HAVE_LOCALTIME_R)
1470 assert(buffer_size > (size_t)29);
1472 time(¤t_time);
1474 #if HAVE_LOCALTIME_R
1475 timeptr = localtime_r(¤t_time, &dummy);
1476 #elif defined(MUTEX_LOCKS_AVAILABLE)
1477 privoxy_mutex_lock(&localtime_mutex);
1478 timeptr = localtime(¤t_time);
1479 privoxy_mutex_unlock(&localtime_mutex);
1481 timeptr = localtime(¤t_time);
1484 strftime(buf, buffer_size, "%a %b %d %X %Z %Y", timeptr);
1489 #ifdef FEATURE_COMPRESSION
1490 /*********************************************************************
1492 * Function : compress_buffer
1494 * Description : Compresses the content of a buffer with zlib's deflate
1495 * Allocates a new buffer for the result, free'ing it is
1499 * 1 : buffer = buffer whose content should be compressed
1500 * 2 : buffer_length = length of the buffer
1501 * 3 : compression_level = compression level for compress2()
1503 * Returns : NULL on error, otherwise a pointer to the compressed
1504 * content of the input buffer.
1506 *********************************************************************/
1507 char *compress_buffer(char *buffer, size_t *buffer_length, int compression_level)
1509 char *compressed_buffer;
1511 assert(-1 <= compression_level && compression_level <= 9);
1513 /* Let zlib figure out the maximum length of the compressed data */
1514 new_length = compressBound((uLongf)*buffer_length);
1516 compressed_buffer = malloc_or_die(new_length);
1518 if (Z_OK != compress2((Bytef *)compressed_buffer, &new_length,
1519 (Bytef *)buffer, *buffer_length, compression_level))
1521 log_error(LOG_LEVEL_ERROR,
1522 "compress2() failed. Buffer size: %d, compression level: %d.",
1523 new_length, compression_level);
1524 freez(compressed_buffer);
1528 log_error(LOG_LEVEL_RE_FILTER,
1529 "Compressed content from %d to %d bytes. Compression level: %d",
1530 *buffer_length, new_length, compression_level);
1532 *buffer_length = (size_t)new_length;
1534 return compressed_buffer;
1540 /*********************************************************************
1542 * Function : finish_http_response
1544 * Description : Fill in the missing headers in an http response,
1545 * and flatten the headers to an http head.
1546 * For HEAD requests the body is freed once
1547 * the Content-Length header is set.
1550 * 1 : rsp = pointer to http_response to be processed
1552 * Returns : A http_response, usually the rsp parameter.
1553 * On error, free()s rsp and returns cgi_error_memory()
1555 *********************************************************************/
1556 struct http_response *finish_http_response(struct client_state *csp, struct http_response *rsp)
1558 char buf[BUFFER_SIZE];
1561 /* Special case - do NOT change this statically allocated response,
1562 * which is ready for output anyway.
1564 if (rsp == cgi_error_memory_response)
1570 * Fill in the HTTP Status, using HTTP/1.1
1571 * unless the client asked for HTTP/1.0.
1573 snprintf(buf, sizeof(buf), "%s %s",
1574 strcmpic(csp->http->ver, "HTTP/1.0") ? "HTTP/1.1" : "HTTP/1.0",
1575 rsp->status ? rsp->status : "200 OK");
1576 err = enlist_first(rsp->headers, buf);
1579 * Set the Content-Length
1581 if (rsp->content_length == 0)
1583 rsp->content_length = rsp->body ? strlen(rsp->body) : 0;
1586 #ifdef FEATURE_COMPRESSION
1587 if (!err && (csp->flags & CSP_FLAG_CLIENT_SUPPORTS_DEFLATE)
1588 && (rsp->content_length > LOWER_LENGTH_LIMIT_FOR_COMPRESSION))
1590 char *compressed_content;
1592 compressed_content = compress_buffer(rsp->body, &rsp->content_length,
1593 csp->config->compression_level);
1594 if (NULL != compressed_content)
1597 rsp->body = compressed_content;
1598 err = enlist_unique_header(rsp->headers, "Content-Encoding", "deflate");
1605 snprintf(buf, sizeof(buf), "Content-Length: %d", (int)rsp->content_length);
1607 * Signal serve() that the client will be able to figure out
1608 * the end of the response without having to close the connection.
1610 csp->flags |= CSP_FLAG_SERVER_CONTENT_LENGTH_SET;
1611 err = enlist(rsp->headers, buf);
1614 if (0 == strcmpic(csp->http->gpc, "head"))
1617 * The client only asked for the head. Dispose
1618 * the body and log an offensive message.
1620 * While it may seem to be a bit inefficient to
1621 * prepare the body if it isn't needed, it's the
1622 * only way to get the Content-Length right for
1623 * dynamic pages. We could have disposed the body
1624 * earlier, but not without duplicating the
1625 * Content-Length setting code above.
1627 log_error(LOG_LEVEL_CGI, "Preparing to give head to %s.", csp->ip_addr_str);
1629 rsp->content_length = 0;
1632 if (strncmpic(rsp->status, "302", 3))
1635 * If it's not a redirect without any content,
1636 * set the Content-Type to text/html if it's
1637 * not already specified.
1639 if (!err) err = enlist_unique(rsp->headers, "Content-Type: text/html", 13);
1643 * Fill in the rest of the default headers:
1645 * Date: set to current date/time.
1646 * Last-Modified: set to date/time the page was last changed.
1647 * Expires: set to date/time page next needs reloading.
1648 * Cache-Control: set to "no-cache" if applicable.
1650 * See http://www.w3.org/Protocols/rfc2068/rfc2068
1655 * Set Expires to about 10 min into the future so it'll get reloaded
1656 * occasionally, e.g. if Privoxy gets upgraded.
1661 get_http_time(0, buf, sizeof(buf));
1662 err = enlist_unique_header(rsp->headers, "Date", buf);
1665 /* Some date in the past. */
1666 if (!err) err = enlist_unique_header(rsp->headers, "Last-Modified", "Sat, 17 Jun 2000 12:00:00 GMT");
1670 get_http_time(10 * 60, buf, sizeof(buf)); /* 10 * 60sec = 10 minutes */
1671 err = enlist_unique_header(rsp->headers, "Expires", buf);
1674 else if (!strncmpic(rsp->status, "302", 3))
1676 get_http_time(0, buf, sizeof(buf));
1677 if (!err) err = enlist_unique_header(rsp->headers, "Date", buf);
1682 * Setting "Cache-Control" to "no-cache" and "Expires" to
1683 * the current time doesn't exactly forbid caching, it just
1684 * requires the client to revalidate the cached copy.
1686 * If a temporary problem occurs and the user tries again after
1687 * getting Privoxy's error message, a compliant browser may set the
1688 * If-Modified-Since header with the content of the error page's
1689 * Last-Modified header. More often than not, the document on the server
1690 * is older than Privoxy's error message, the server would send status code
1691 * 304 and the browser would display the outdated error message again and again.
1693 * For documents delivered with status code 403, 404 and 503 we set "Last-Modified"
1694 * to Tim Berners-Lee's birthday, which predates the age of any page on the web
1695 * and can be safely used to "revalidate" without getting a status code 304.
1697 * There is no need to let the useless If-Modified-Since header reach the
1698 * server, it is therefore stripped by client_if_modified_since in parsers.c.
1700 if (!err) err = enlist_unique_header(rsp->headers, "Cache-Control", "no-cache");
1702 get_http_time(0, buf, sizeof(buf));
1703 if (!err) err = enlist_unique_header(rsp->headers, "Date", buf);
1704 if (!strncmpic(rsp->status, "403", 3)
1705 || !strncmpic(rsp->status, "404", 3)
1706 || !strncmpic(rsp->status, "502", 3)
1707 || !strncmpic(rsp->status, "503", 3)
1708 || !strncmpic(rsp->status, "504", 3))
1710 if (!err) err = enlist_unique_header(rsp->headers, "Last-Modified", "Wed, 08 Jun 1955 12:00:00 GMT");
1714 if (!err) err = enlist_unique_header(rsp->headers, "Last-Modified", buf);
1716 if (!err) err = enlist_unique_header(rsp->headers, "Expires", "Sat, 17 Jun 2000 12:00:00 GMT");
1717 if (!err) err = enlist_unique_header(rsp->headers, "Pragma", "no-cache");
1720 if (!err && (!(csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE)
1721 || (csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED)))
1723 err = enlist_unique_header(rsp->headers, "Connection", "close");
1729 if (err || (NULL == (rsp->head = list_to_text(rsp->headers))))
1731 free_http_response(rsp);
1732 return cgi_error_memory();
1734 rsp->head_length = strlen(rsp->head);
1741 /*********************************************************************
1743 * Function : alloc_http_response
1745 * Description : Allocates a new http_response structure.
1749 * Returns : pointer to a new http_response, or NULL.
1751 *********************************************************************/
1752 struct http_response *alloc_http_response(void)
1754 return (struct http_response *) zalloc(sizeof(struct http_response));
1759 /*********************************************************************
1761 * Function : free_http_response
1763 * Description : Free the memory occupied by an http_response
1764 * and its depandant structures.
1767 * 1 : rsp = pointer to http_response to be freed
1771 *********************************************************************/
1772 void free_http_response(struct http_response *rsp)
1775 * Must special case cgi_error_memory_response, which is never freed.
1777 if (rsp && (rsp != cgi_error_memory_response))
1782 destroy_list(rsp->headers);
1789 /*********************************************************************
1791 * Function : template_load
1793 * Description : CGI support function that loads a given HTML
1794 * template, ignoring comment lines and following
1795 * #include statements up to a depth of 1.
1798 * 1 : csp = Current client state (buffers, headers, etc...)
1799 * 2 : template_ptr = Destination for pointer to loaded
1801 * 3 : templatename = name of the HTML template to be used
1802 * 4 : recursive = Flag set if this function calls itself
1803 * following an #include statament
1805 * Returns : JB_ERR_OK on success
1806 * JB_ERR_MEMORY on out-of-memory error.
1807 * JB_ERR_FILE if the template file cannot be read
1809 *********************************************************************/
1810 jb_err template_load(const struct client_state *csp, char **template_ptr,
1811 const char *templatename, int recursive)
1814 char *templates_dir_path;
1817 char *included_module;
1820 char buf[BUFFER_SIZE];
1823 assert(template_ptr);
1824 assert(templatename);
1826 *template_ptr = NULL;
1828 /* Validate template name. Paranoia. */
1829 for (p = templatename; *p != 0; p++)
1831 if ( ((*p < 'a') || (*p > 'z'))
1832 && ((*p < 'A') || (*p > 'Z'))
1833 && ((*p < '0') || (*p > '9'))
1837 /* Illegal character */
1843 * Generate full path using either templdir
1844 * or confdir/templates as base directory.
1846 if (NULL != csp->config->templdir)
1848 templates_dir_path = strdup(csp->config->templdir);
1852 templates_dir_path = make_path(csp->config->confdir, "templates");
1855 if (templates_dir_path == NULL)
1857 log_error(LOG_LEVEL_ERROR, "Out of memory while generating template path for %s.",
1859 return JB_ERR_MEMORY;
1862 full_path = make_path(templates_dir_path, templatename);
1863 free(templates_dir_path);
1864 if (full_path == NULL)
1866 log_error(LOG_LEVEL_ERROR, "Out of memory while generating full template path for %s.",
1868 return JB_ERR_MEMORY;
1871 /* Allocate buffer */
1873 file_buffer = strdup("");
1874 if (file_buffer == NULL)
1876 log_error(LOG_LEVEL_ERROR, "Not enough free memory to buffer %s.", full_path);
1878 return JB_ERR_MEMORY;
1881 /* Open template file */
1883 if (NULL == (fp = fopen(full_path, "r")))
1885 log_error(LOG_LEVEL_ERROR, "Cannot open template file %s: %E", full_path);
1893 * Read the file, ignoring comments, and honoring #include
1894 * statements, unless we're already called recursively.
1896 * XXX: The comment handling could break with lines lengths > sizeof(buf).
1897 * This is unlikely in practise.
1899 while (fgets(buf, sizeof(buf), fp))
1901 if (!recursive && !strncmp(buf, "#include ", 9))
1903 if (JB_ERR_OK != (err = template_load(csp, &included_module, chomp(buf + 9), 1)))
1910 if (string_join(&file_buffer, included_module))
1913 return JB_ERR_MEMORY;
1919 /* skip lines starting with '#' */
1925 if (string_append(&file_buffer, buf))
1928 return JB_ERR_MEMORY;
1933 *template_ptr = file_buffer;
1939 /*********************************************************************
1941 * Function : template_fill
1943 * Description : CGI support function that fills in a pre-loaded
1944 * HTML template by replacing @name@ with value using
1945 * pcrs, for each item in the output map.
1947 * Note that a leading '$' character in the export map's
1948 * values will be stripped and toggle on backreference
1952 * 1 : template_ptr = IN: Template to be filled out.
1954 * OUT: Filled out template.
1955 * Caller must free().
1956 * 2 : exports = map with fill in symbol -> name pairs
1958 * Returns : JB_ERR_OK on success (and for uncritical errors)
1959 * JB_ERR_MEMORY on out-of-memory error
1961 *********************************************************************/
1962 jb_err template_fill(char **template_ptr, const struct map *exports)
1964 struct map_entry *m;
1966 char buf[BUFFER_SIZE];
1967 char *tmp_out_buffer;
1973 assert(template_ptr);
1974 assert(*template_ptr);
1977 file_buffer = *template_ptr;
1978 size = strlen(file_buffer) + 1;
1981 * Assemble pcrs joblist from exports map
1983 for (m = exports->first; m != NULL; m = m->next)
1985 if (*m->name == '$')
1988 * First character of name is '$', so remove this flag
1989 * character and allow backreferences ($1 etc) in the
1990 * "replace with" text.
1992 snprintf(buf, sizeof(buf), "%s", m->name + 1);
1998 * Treat the "replace with" text as a literal string -
1999 * no quoting needed, no backreferences allowed.
2000 * ("Trivial" ['T'] flag).
2004 /* Enclose name in @@ */
2005 snprintf(buf, sizeof(buf), "@%s@", m->name);
2008 log_error(LOG_LEVEL_CGI, "Substituting: s/%s/%s/%s", buf, m->value, flags);
2010 /* Make and run job. */
2011 job = pcrs_compile(buf, m->value, flags, &error);
2014 if (error == PCRS_ERR_NOMEM)
2017 *template_ptr = NULL;
2018 return JB_ERR_MEMORY;
2022 log_error(LOG_LEVEL_ERROR, "Error compiling template fill job %s: %d", m->name, error);
2023 /* Hope it wasn't important and silently ignore the invalid job */
2028 error = pcrs_execute(job, file_buffer, size, &tmp_out_buffer, &size);
2031 if (NULL == tmp_out_buffer)
2033 *template_ptr = NULL;
2034 return JB_ERR_MEMORY;
2040 * Substitution failed, keep the original buffer,
2041 * log the problem and ignore it.
2043 * The user might see some unresolved @CGI_VARIABLES@,
2044 * but returning a special CGI error page seems unreasonable
2045 * and could mask more important error messages.
2047 free(tmp_out_buffer);
2048 log_error(LOG_LEVEL_ERROR, "Failed to execute s/%s/%s/%s. %s",
2049 buf, m->value, flags, pcrs_strerror(error));
2053 /* Substitution succeeded, use modified buffer. */
2055 file_buffer = tmp_out_buffer;
2063 *template_ptr = file_buffer;
2068 /*********************************************************************
2070 * Function : template_fill_for_cgi
2072 * Description : CGI support function that loads a HTML template
2073 * and fills it in. Handles file-not-found errors
2074 * by sending a HTML error message. For convenience,
2075 * this function also frees the passed "exports" map.
2078 * 1 : csp = Client state
2079 * 2 : templatename = name of the HTML template to be used
2080 * 3 : exports = map with fill in symbol -> name pairs.
2081 * Will be freed by this function.
2082 * 4 : rsp = Response structure to fill in.
2084 * Returns : JB_ERR_OK on success
2085 * JB_ERR_MEMORY on out-of-memory error
2087 *********************************************************************/
2088 jb_err template_fill_for_cgi(const struct client_state *csp,
2089 const char *templatename,
2090 struct map *exports,
2091 struct http_response *rsp)
2096 assert(templatename);
2100 err = template_load(csp, &rsp->body, templatename, 0);
2101 if (err == JB_ERR_FILE)
2104 return cgi_error_no_template(csp, rsp, templatename);
2109 return err; /* JB_ERR_MEMORY */
2111 err = template_fill(&rsp->body, exports);
2117 /*********************************************************************
2119 * Function : default_exports
2121 * Description : returns a struct map list that contains exports
2122 * which are common to all CGI functions.
2125 * 1 : csp = Current client state (buffers, headers, etc...)
2126 * 2 : caller = name of CGI who calls us and which should
2127 * be excluded from the generated menu. May be
2129 * Returns : NULL if no memory, else a new map. Caller frees.
2131 *********************************************************************/
2132 struct map *default_exports(const struct client_state *csp, const char *caller)
2136 struct map * exports;
2137 int local_help_exists = 0;
2138 char *ip_address = NULL;
2140 char *hostname = NULL;
2144 exports = new_map();
2146 if (csp->config->hostname)
2148 get_host_information(csp->cfd, &ip_address, &port, NULL);
2149 hostname = strdup(csp->config->hostname);
2153 get_host_information(csp->cfd, &ip_address, &port, &hostname);
2156 err = map(exports, "version", 1, html_encode(VERSION), 0);
2157 get_locale_time(buf, sizeof(buf));
2158 if (!err) err = map(exports, "time", 1, html_encode(buf), 0);
2159 if (!err) err = map(exports, "my-ip-address", 1, html_encode(ip_address ? ip_address : "unknown"), 0);
2161 if (!err) err = map(exports, "my-port", 1, html_encode(port ? port : "unknown"), 0);
2163 if (!err) err = map(exports, "my-hostname", 1, html_encode(hostname ? hostname : "unknown"), 0);
2165 if (!err) err = map(exports, "homepage", 1, html_encode(HOME_PAGE_URL), 0);
2166 if (!err) err = map(exports, "default-cgi", 1, html_encode(CGI_PREFIX), 0);
2167 if (!err) err = map(exports, "menu", 1, make_menu(caller, csp->config->feature_flags), 0);
2168 if (!err) err = map(exports, "code-status", 1, CODE_STATUS, 1);
2169 if (!strncmpic(csp->config->usermanual, "file://", 7) ||
2170 !strncmpic(csp->config->usermanual, "http", 4))
2172 /* Manual is located somewhere else, just link to it. */
2173 if (!err) err = map(exports, "user-manual", 1, html_encode(csp->config->usermanual), 0);
2177 /* Manual is delivered by Privoxy. */
2178 if (!err) err = map(exports, "user-manual", 1, html_encode(CGI_PREFIX"user-manual/"), 0);
2180 if (!err) err = map(exports, "actions-help-prefix", 1, ACTIONS_HELP_PREFIX ,1);
2181 #ifdef FEATURE_TOGGLE
2182 if (!err) err = map_conditional(exports, "enabled-display", global_toggle_state);
2184 if (!err) err = map_block_killer(exports, "can-toggle");
2187 if (!strcmp(CODE_STATUS, "stable"))
2189 if (!err) err = map_block_killer(exports, "unstable");
2192 if (csp->config->admin_address != NULL)
2194 if (!err) err = map(exports, "admin-address", 1, html_encode(csp->config->admin_address), 0);
2195 local_help_exists = 1;
2199 if (!err) err = map_block_killer(exports, "have-adminaddr-info");
2202 if (csp->config->proxy_info_url != NULL)
2204 if (!err) err = map(exports, "proxy-info-url", 1, html_encode(csp->config->proxy_info_url), 0);
2205 local_help_exists = 1;
2209 if (!err) err = map_block_killer(exports, "have-proxy-info");
2212 if (local_help_exists == 0)
2214 if (!err) err = map_block_killer(exports, "have-help-info");
2227 /*********************************************************************
2229 * Function : map_block_killer
2231 * Description : Convenience function.
2232 * Adds a "killer" for the conditional HTML-template
2233 * block <name>, i.e. a substitution of the regex
2234 * "if-<name>-start.*if-<name>-end" to the given
2238 * 1 : exports = map to extend
2239 * 2 : name = name of conditional block
2241 * Returns : JB_ERR_OK on success
2242 * JB_ERR_MEMORY on out-of-memory error.
2244 *********************************************************************/
2245 jb_err map_block_killer(struct map *exports, const char *name)
2247 char buf[1000]; /* Will do, since the names are hardwired */
2251 assert(strlen(name) < (size_t)490);
2253 snprintf(buf, sizeof(buf), "if-%s-start.*if-%s-end", name, name);
2254 return map(exports, buf, 1, "", 1);
2258 /*********************************************************************
2260 * Function : map_block_keep
2262 * Description : Convenience function. Removes the markers used
2263 * by map-block-killer, to save a few bytes.
2264 * i.e. removes "@if-<name>-start@" and "@if-<name>-end@"
2267 * 1 : exports = map to extend
2268 * 2 : name = name of conditional block
2270 * Returns : JB_ERR_OK on success
2271 * JB_ERR_MEMORY on out-of-memory error.
2273 *********************************************************************/
2274 jb_err map_block_keep(struct map *exports, const char *name)
2277 char buf[500]; /* Will do, since the names are hardwired */
2281 assert(strlen(name) < (size_t)490);
2283 snprintf(buf, sizeof(buf), "if-%s-start", name);
2284 err = map(exports, buf, 1, "", 1);
2291 snprintf(buf, sizeof(buf), "if-%s-end", name);
2292 return map(exports, buf, 1, "", 1);
2296 /*********************************************************************
2298 * Function : map_conditional
2300 * Description : Convenience function.
2301 * Adds an "if-then-else" for the conditional HTML-template
2302 * block <name>, i.e. a substitution of the form:
2309 * The control structure and one of the alternatives
2313 * 1 : exports = map to extend
2314 * 2 : name = name of conditional block
2315 * 3 : choose_first = nonzero for first, zero for second.
2317 * Returns : JB_ERR_OK on success
2318 * JB_ERR_MEMORY on out-of-memory error.
2320 *********************************************************************/
2321 jb_err map_conditional(struct map *exports, const char *name, int choose_first)
2323 char buf[1000]; /* Will do, since the names are hardwired */
2328 assert(strlen(name) < (size_t)480);
2330 snprintf(buf, sizeof(buf), (choose_first
2331 ? "else-not-%s@.*@endif-%s"
2332 : "if-%s-then@.*@else-not-%s"),
2335 err = map(exports, buf, 1, "", 1);
2341 snprintf(buf, sizeof(buf), (choose_first ? "if-%s-then" : "endif-%s"), name);
2342 return map(exports, buf, 1, "", 1);
2346 /*********************************************************************
2348 * Function : make_menu
2350 * Description : Returns an HTML-formatted menu of the available
2351 * unhidden CGIs, excluding the one given in <self>
2352 * and the toggle CGI if toggling is disabled.
2355 * 1 : self = name of CGI to leave out, can be NULL for
2357 * 2 : feature_flags = feature bitmap from csp->config
2360 * Returns : menu string, or NULL on out-of-memory error.
2362 *********************************************************************/
2363 char *make_menu(const char *self, const unsigned feature_flags)
2365 const struct cgi_dispatcher *d;
2366 char *result = strdup("");
2370 self = "NO-SUCH-CGI!";
2373 /* List available unhidden CGI's and export as "other-cgis" */
2374 for (d = cgi_dispatchers; d->name; d++)
2377 #ifdef FEATURE_TOGGLE
2378 if (!(feature_flags & RUNTIME_FEATURE_CGI_TOGGLE) && !strcmp(d->name, "toggle"))
2381 * Suppress the toggle link if remote toggling is disabled.
2385 #endif /* def FEATURE_TOGGLE */
2387 if (d->description && strcmp(d->name, self))
2389 char *html_encoded_prefix;
2392 * Line breaks would be great, but break
2393 * the "blocked" template's JavaScript.
2395 string_append(&result, "<li><a href=\"");
2396 html_encoded_prefix = html_encode(CGI_PREFIX);
2397 if (html_encoded_prefix == NULL)
2403 string_append(&result, html_encoded_prefix);
2404 free(html_encoded_prefix);
2406 string_append(&result, d->name);
2407 string_append(&result, "\">");
2408 string_append(&result, d->description);
2409 string_append(&result, "</a></li>");
2417 /*********************************************************************
2419 * Function : dump_map
2421 * Description : HTML-dump a map for debugging (as table)
2424 * 1 : the_map = map to dump
2426 * Returns : string with HTML
2428 *********************************************************************/
2429 char *dump_map(const struct map *the_map)
2431 struct map_entry *cur_entry;
2432 char *ret = strdup("");
2434 string_append(&ret, "<table>\n");
2436 for (cur_entry = the_map->first;
2437 (cur_entry != NULL) && (ret != NULL);
2438 cur_entry = cur_entry->next)
2440 string_append(&ret, "<tr><td><b>");
2441 string_join (&ret, html_encode(cur_entry->name));
2442 string_append(&ret, "</b></td><td>");
2443 string_join (&ret, html_encode(cur_entry->value));
2444 string_append(&ret, "</td></tr>\n");
2447 string_append(&ret, "</table>\n");