1 const char cgi_rcs[] = "$Id: cgi.c,v 1.158 2012/12/07 12:45:20 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 * the SourceForge 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",
105 "View the request headers",
109 "Look up which actions apply to a URL and why",
111 #ifdef FEATURE_TOGGLE
114 "Toggle Privoxy on or off",
116 #endif /* def FEATURE_TOGGLE */
117 #ifdef FEATURE_CGI_EDIT_ACTIONS
118 { "edit-actions", /* Edit the actions list */
121 { "eaa", /* Shortcut for edit-actions-add-url-form */
122 cgi_edit_actions_add_url_form,
124 { "eau", /* Shortcut for edit-actions-url-form */
125 cgi_edit_actions_url_form,
127 { "ear", /* Shortcut for edit-actions-remove-url-form */
128 cgi_edit_actions_remove_url_form,
130 { "eal", /* Shortcut for edit-actions-list */
131 cgi_edit_actions_list,
133 { "eafu", /* Shortcut for edit-actions-for-url */
134 cgi_edit_actions_for_url,
136 { "eas", /* Shortcut for edit-actions-submit */
137 cgi_edit_actions_submit,
139 { "easa", /* Shortcut for edit-actions-section-add */
140 cgi_edit_actions_section_add,
142 { "easr", /* Shortcut for edit-actions-section-remove */
143 cgi_edit_actions_section_remove,
145 { "eass", /* Shortcut for edit-actions-section-swap */
146 cgi_edit_actions_section_swap,
148 { "edit-actions-for-url",
149 cgi_edit_actions_for_url,
150 NULL, FALSE /* Edit the actions for (a) specified URL(s) */ },
151 { "edit-actions-list",
152 cgi_edit_actions_list,
153 NULL, TRUE /* Edit the actions list */ },
154 { "edit-actions-submit",
155 cgi_edit_actions_submit,
156 NULL, FALSE /* Change the actions for (a) specified URL(s) */ },
157 { "edit-actions-url",
158 cgi_edit_actions_url,
159 NULL, FALSE /* Change a URL pattern in the actionsfile */ },
160 { "edit-actions-url-form",
161 cgi_edit_actions_url_form,
162 NULL, FALSE /* Form to change a URL pattern in the actionsfile */ },
163 { "edit-actions-add-url",
164 cgi_edit_actions_add_url,
165 NULL, FALSE /* Add a URL pattern to the actionsfile */ },
166 { "edit-actions-add-url-form",
167 cgi_edit_actions_add_url_form,
168 NULL, FALSE /* Form to add a URL pattern to the actionsfile */ },
169 { "edit-actions-remove-url",
170 cgi_edit_actions_remove_url,
171 NULL, FALSE /* Remove a URL pattern from the actionsfile */ },
172 { "edit-actions-remove-url-form",
173 cgi_edit_actions_remove_url_form,
174 NULL, FALSE /* Form to remove a URL pattern from the actionsfile */ },
175 { "edit-actions-section-add",
176 cgi_edit_actions_section_add,
177 NULL, FALSE /* Remove a section from the actionsfile */ },
178 { "edit-actions-section-remove",
179 cgi_edit_actions_section_remove,
180 NULL, FALSE /* Remove a section from the actionsfile */ },
181 { "edit-actions-section-swap",
182 cgi_edit_actions_section_swap,
183 NULL, FALSE /* Swap two sections in the actionsfile */ },
184 #endif /* def FEATURE_CGI_EDIT_ACTIONS */
185 { "error-favicon.ico",
186 cgi_send_error_favicon,
187 NULL, TRUE /* Sends the favicon image for error pages. */ },
189 cgi_send_default_favicon,
190 NULL, TRUE /* Sends the default favicon image. */ },
193 NULL, TRUE /* Sends a robots.txt file to tell robots to go away. */ },
196 NULL, TRUE /* Send a built-in image */ },
199 NULL, FALSE /* Send templates/cgi-style.css */ },
201 cgi_transparent_image,
202 NULL, TRUE /* Send a transparent image (short name) */ },
203 { "url-info-osd.xml",
204 cgi_send_url_info_osd,
205 NULL, TRUE /* Send templates/url-info-osd.xml */ },
207 cgi_send_user_manual,
208 NULL, TRUE /* Send user-manual */ },
209 { NULL, /* NULL Indicates end of list and default page */
211 NULL, TRUE /* Unknown CGI page */ }
216 * Built-in images for ad replacement
218 * Hint: You can encode your own images like this:
219 * cat your-image | perl -e 'while (read STDIN, $c, 1) { printf("\\%.3o", unpack("C", $c)); }'
222 #ifdef FEATURE_NO_GIFS
225 * Checkerboard pattern, as a PNG.
227 const char image_pattern_data[] =
228 "\211\120\116\107\015\012\032\012\000\000\000\015\111\110\104"
229 "\122\000\000\000\004\000\000\000\004\010\006\000\000\000\251"
230 "\361\236\176\000\000\000\006\142\113\107\104\000\000\000\000"
231 "\000\000\371\103\273\177\000\000\000\033\111\104\101\124\010"
232 "\327\143\140\140\140\060\377\377\377\077\003\234\106\341\060"
233 "\060\230\063\020\124\001\000\161\021\031\241\034\364\030\143"
234 "\000\000\000\000\111\105\116\104\256\102\140\202";
237 * 1x1 transparant PNG.
239 const char image_blank_data[] =
240 "\211\120\116\107\015\012\032\012\000\000\000\015\111\110\104\122"
241 "\000\000\000\001\000\000\000\001\001\003\000\000\000\045\333\126"
242 "\312\000\000\000\003\120\114\124\105\377\377\377\247\304\033\310"
243 "\000\000\000\001\164\122\116\123\000\100\346\330\146\000\000\000"
244 "\001\142\113\107\104\000\210\005\035\110\000\000\000\012\111\104"
245 "\101\124\170\001\143\140\000\000\000\002\000\001\163\165\001\030"
246 "\000\000\000\000\111\105\116\104\256\102\140\202";
250 * Checkerboard pattern, as a GIF.
252 const char image_pattern_data[] =
253 "\107\111\106\070\071\141\004\000\004\000\200\000\000\310\310"
254 "\310\377\377\377\041\376\016\111\040\167\141\163\040\141\040"
255 "\142\141\156\156\145\162\000\041\371\004\001\012\000\001\000"
256 "\054\000\000\000\000\004\000\004\000\000\002\005\104\174\147"
260 * 1x1 transparant GIF.
262 const char image_blank_data[] =
263 "GIF89a\001\000\001\000\200\000\000\377\377\377\000\000"
264 "\000!\371\004\001\000\000\000\000,\000\000\000\000\001"
265 "\000\001\000\000\002\002D\001\000;";
268 const size_t image_pattern_length = sizeof(image_pattern_data) - 1;
269 const size_t image_blank_length = sizeof(image_blank_data) - 1;
271 #ifdef FEATURE_COMPRESSION
273 * Minimum length which a buffer has to reach before
274 * we bother to (re-)compress it. Completely arbitrary.
276 const size_t LOWER_LENGTH_LIMIT_FOR_COMPRESSION = 1024U;
279 static struct http_response cgi_error_memory_response[1];
281 static struct http_response *dispatch_known_cgi(struct client_state * csp,
283 static struct map *parse_cgi_parameters(char *argstring);
286 /*********************************************************************
288 * Function : dispatch_cgi
290 * Description : Checks if a request URL has either the magical
291 * hostname CGI_SITE_1_HOST (usually http://p.p/) or
292 * matches CGI_SITE_2_HOST CGI_SITE_2_PATH (usually
293 * http://config.privoxy.org/). If so, it passes
294 * the (rest of the) path onto dispatch_known_cgi, which
295 * calls the relevant CGI handler function.
298 * 1 : csp = Current client state (buffers, headers, etc...)
300 * Returns : http_response if match, NULL if nonmatch or handler fail
302 *********************************************************************/
303 struct http_response *dispatch_cgi(struct client_state *csp)
305 const char *host = csp->http->host;
306 const char *path = csp->http->path;
309 * Should we intercept ?
312 /* Note: "example.com" and "example.com." are equivalent hostnames. */
314 /* Either the host matches CGI_SITE_1_HOST ..*/
315 if ( ( (0 == strcmpic(host, CGI_SITE_1_HOST))
316 || (0 == strcmpic(host, CGI_SITE_1_HOST ".")))
319 /* ..then the path will all be for us. Remove leading '/' */
322 /* Or it's the host part CGI_SITE_2_HOST, and the path CGI_SITE_2_PATH */
323 else if (( (0 == strcmpic(host, CGI_SITE_2_HOST))
324 || (0 == strcmpic(host, CGI_SITE_2_HOST ".")))
325 && (0 == strncmpic(path, CGI_SITE_2_PATH, strlen(CGI_SITE_2_PATH))))
327 /* take everything following CGI_SITE_2_PATH */
328 path += strlen(CGI_SITE_2_PATH);
331 /* skip the forward slash after CGI_SITE_2_PATH */
334 else if (*path != '\0')
337 * weirdness: URL is /configXXX, where XXX is some string
338 * Do *NOT* intercept.
349 if (strcmpic(csp->http->gpc, "GET")
350 && strcmpic(csp->http->gpc, "HEAD"))
352 log_error(LOG_LEVEL_ERROR,
353 "CGI request with unsupported method received: %s", csp->http->gpc);
355 * The CGI pages currently only support GET and HEAD requests.
357 * If the client used a different method, ditch any data following
358 * the current headers to reduce the likelihood of parse errors
359 * with the following request.
361 csp->client_iob->eod = csp->client_iob->cur;
365 * This is a CGI call.
368 return dispatch_known_cgi(csp, path);
372 /*********************************************************************
374 * Function : grep_cgi_referrer
376 * Description : Ugly provisorical fix that greps the value of the
377 * referer HTTP header field out of a linked list of
378 * strings like found at csp->headers. Will disappear
381 * FIXME: csp->headers ought to be csp->http->headers
382 * FIXME: Parsing all client header lines should
383 * happen right after the request is received!
386 * 1 : csp = Current client state (buffers, headers, etc...)
388 * Returns : pointer to value (no copy!), or NULL if none found.
390 *********************************************************************/
391 static char *grep_cgi_referrer(const struct client_state *csp)
393 struct list_entry *p;
395 for (p = csp->headers->first; p != NULL; p = p->next)
397 if (p->str == NULL) continue;
398 if (strncmpic(p->str, "Referer: ", 9) == 0)
400 return ((p->str) + 9);
408 /*********************************************************************
410 * Function : referrer_is_safe
412 * Description : Decides whether we trust the Referer for
413 * CGI pages which are only meant to be reachable
414 * through Privoxy's web interface directly.
417 * 1 : csp = Current client state (buffers, headers, etc...)
419 * Returns : TRUE if the referrer is safe, or
420 * FALSE if the referrer is unsafe or not set.
422 *********************************************************************/
423 static int referrer_is_safe(const struct client_state *csp)
426 static const char alternative_prefix[] = "http://" CGI_SITE_1_HOST "/";
428 referrer = grep_cgi_referrer(csp);
430 if (NULL == referrer)
432 /* No referrer, no access */
433 log_error(LOG_LEVEL_ERROR, "Denying access to %s. No referrer found.",
436 else if ((0 == strncmp(referrer, CGI_PREFIX, sizeof(CGI_PREFIX)-1)
437 || (0 == strncmp(referrer, alternative_prefix, strlen(alternative_prefix)))))
439 /* Trustworthy referrer */
440 log_error(LOG_LEVEL_CGI, "Granting access to %s, referrer %s is trustworthy.",
441 csp->http->url, referrer);
447 /* Untrustworthy referrer */
448 log_error(LOG_LEVEL_ERROR, "Denying access to %s, referrer %s isn't trustworthy.",
449 csp->http->url, referrer);
456 /*********************************************************************
458 * Function : dispatch_known_cgi
460 * Description : Processes a CGI once dispatch_cgi has determined that
461 * it matches one of the magic prefixes. Parses the path
462 * as a cgi name plus query string, prepares a map that
463 * maps CGI parameter names to their values, initializes
464 * the http_response struct, and calls the relevant CGI
468 * 1 : csp = Current client state (buffers, headers, etc...)
469 * 2 : path = Path of CGI, with the CGI prefix removed.
470 * Should not have a leading "/".
472 * Returns : http_response, or NULL on handler failure or out of
475 *********************************************************************/
476 static struct http_response *dispatch_known_cgi(struct client_state * csp,
479 const struct cgi_dispatcher *d;
480 struct map *param_list;
481 struct http_response *rsp;
482 char *query_args_start;
486 if (NULL == (path_copy = strdup(path)))
488 return cgi_error_memory();
490 query_args_start = path_copy;
491 while (*query_args_start && *query_args_start != '?' && *query_args_start != '/')
495 if (*query_args_start == '/')
497 *query_args_start++ = '\0';
498 if ((param_list = new_map()))
500 err = map(param_list, "file", 1, url_decode(query_args_start), 0);
501 if (JB_ERR_OK != err) {
504 return cgi_error_memory();
510 if (*query_args_start == '?')
512 *query_args_start++ = '\0';
514 if (NULL == (param_list = parse_cgi_parameters(query_args_start)))
517 return cgi_error_memory();
523 * path_copy = CGI call name
524 * param_list = CGI params, as map
527 /* Get mem for response or fail*/
528 if (NULL == (rsp = alloc_http_response()))
531 free_map(param_list);
532 return cgi_error_memory();
536 * Find and start the right CGI function
541 if ((d->name == NULL) || (strcmp(path_copy, d->name) == 0))
544 * If the called CGI is either harmless, or referred
545 * from a trusted source, start it.
547 if (d->harmless || referrer_is_safe(csp))
549 err = (d->handler)(csp, rsp, param_list);
554 * Else, modify toggle calls so that they only display
555 * the status, and deny all other calls.
557 if (0 == strcmp(path_copy, "toggle"))
559 unmap(param_list, "set");
560 err = (d->handler)(csp, rsp, param_list);
564 err = cgi_error_disabled(csp, rsp);
569 free_map(param_list);
571 if (err == JB_ERR_CGI_PARAMS)
573 err = cgi_error_bad_param(csp, rsp);
575 if (err && (err != JB_ERR_MEMORY))
577 /* Unexpected error! Shouldn't get here */
578 log_error(LOG_LEVEL_ERROR,
579 "Unexpected CGI error %d in top-level handler. "
580 "Please file a bug report!", err);
581 err = cgi_error_unknown(csp, rsp, err);
586 rsp->crunch_reason = CGI_CALL;
587 return finish_http_response(csp, rsp);
591 /* Error in handler, probably out-of-memory */
592 free_http_response(rsp);
593 return cgi_error_memory();
601 /*********************************************************************
603 * Function : parse_cgi_parameters
605 * Description : Parse a URL-encoded argument string into name/value
606 * pairs and store them in a struct map list.
609 * 1 : argstring = string to be parsed. Will be trashed.
611 * Returns : pointer to param list, or NULL if out of memory.
613 *********************************************************************/
614 static struct map *parse_cgi_parameters(char *argstring)
619 struct map *cgi_params;
622 * XXX: This estimate is guaranteed to be high enough as we
623 * let ssplit() ignore empty fields, but also a bit wasteful.
624 * The same hack is used in get_last_url() so it looks like
625 * a real solution is needed.
627 size_t max_segments = strlen(argstring) / 2;
628 if (max_segments == 0)
631 * XXX: If the argstring is empty, there's really
632 * no point in creating a param list, but currently
633 * other parts of Privoxy depend on the list's existence.
637 vector = malloc_or_die(max_segments * sizeof(char *));
639 if (NULL == (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,
826 param = lookup(parameters, name);
829 return JB_ERR_CGI_PARAMS;
832 /* We don't use atoi because I want to check this carefully... */
835 while ((ch = *param++) != '\0')
837 if ((ch < '0') || (ch > '9'))
839 return JB_ERR_CGI_PARAMS;
842 ch = (char)(ch - '0');
846 * <limits.h> defines UINT_MAX
848 * (UINT_MAX - ch) / 10 is the largest number that
849 * can be safely multiplied by 10 then have ch added.
851 if (value > ((UINT_MAX - (unsigned)ch) / 10U))
853 return JB_ERR_CGI_PARAMS;
856 value = value * 10 + (unsigned)ch;
867 /*********************************************************************
869 * Function : error_response
871 * Description : returns an http_response that explains the reason
872 * why a request failed.
875 * 1 : csp = Current client state (buffers, headers, etc...)
876 * 2 : templatename = Which template should be used for the answer
878 * Returns : A http_response. If we run out of memory, this
879 * will be cgi_error_memory().
881 *********************************************************************/
882 struct http_response *error_response(struct client_state *csp,
883 const char *templatename)
886 struct http_response *rsp;
887 struct map *exports = default_exports(csp, NULL);
892 return cgi_error_memory();
895 if (NULL == (rsp = alloc_http_response()))
898 return cgi_error_memory();
901 #ifdef FEATURE_FORCE_LOAD
902 if (csp->flags & CSP_FLAG_FORCED)
904 path = strdup(FORCE_PREFIX);
907 #endif /* def FEATURE_FORCE_LOAD */
911 err = string_append(&path, csp->http->path);
913 if (!err) err = map(exports, "host", 1, html_encode(csp->http->host), 0);
914 if (!err) err = map(exports, "hostport", 1, html_encode(csp->http->hostport), 0);
915 if (!err) err = map(exports, "path", 1, html_encode_and_free_original(path), 0);
916 if (!err) err = map(exports, "protocol", 1, csp->http->ssl ? "https://" : "http://", 1);
919 err = map(exports, "host-ip", 1, html_encode(csp->http->host_ip_addr_str), 0);
922 /* Some failures, like "404 no such domain", don't have an IP address. */
923 err = map(exports, "host-ip", 1, html_encode(csp->http->host), 0);
931 free_http_response(rsp);
932 return cgi_error_memory();
935 if (!strcmp(templatename, "no-such-domain"))
937 rsp->status = strdup("404 No such domain");
938 rsp->crunch_reason = NO_SUCH_DOMAIN;
940 else if (!strcmp(templatename, "forwarding-failed"))
942 const struct forward_spec *fwd = forward_url(csp, csp->http);
943 char *socks_type = NULL;
946 log_error(LOG_LEVEL_FATAL, "gateway spec is NULL. This shouldn't happen!");
947 /* Never get here - LOG_LEVEL_FATAL causes program exit */
951 * XXX: While the template is called forwarding-failed,
952 * it currently only handles socks forwarding failures.
955 assert(fwd->type != SOCKS_NONE);
958 * Map failure reason, forwarding type and forwarder.
960 if (NULL == csp->error_message)
963 * Either we forgot to record the failure reason,
964 * or the memory allocation failed.
966 log_error(LOG_LEVEL_ERROR, "Socks failure reason missing.");
967 csp->error_message = strdup("Failure reason missing. Check the log file for details.");
969 if (!err) err = map(exports, "gateway", 1, fwd->gateway_host, 1);
972 * XXX: this is almost the same code as in cgi_show_url_info()
973 * and thus should be factored out and shared.
978 socks_type = "socks4-";
981 socks_type = "socks4a-";
984 socks_type = "socks5-";
987 socks_type = "socks5t-";
990 log_error(LOG_LEVEL_FATAL, "Unknown socks type: %d.", fwd->type);
993 if (!err) err = map(exports, "forwarding-type", 1, socks_type, 1);
994 if (!err) err = map(exports, "error-message", 1, html_encode(csp->error_message), 0);
995 if ((NULL == csp->error_message) || err)
998 free_http_response(rsp);
999 return cgi_error_memory();
1002 rsp->status = strdup("503 Forwarding failure");
1003 rsp->crunch_reason = FORWARDING_FAILED;
1005 else if (!strcmp(templatename, "connect-failed"))
1007 rsp->status = strdup("503 Connect failed");
1008 rsp->crunch_reason = CONNECT_FAILED;
1010 else if (!strcmp(templatename, "connection-timeout"))
1012 rsp->status = strdup("504 Connection timeout");
1013 rsp->crunch_reason = CONNECTION_TIMEOUT;
1015 else if (!strcmp(templatename, "no-server-data"))
1017 rsp->status = strdup("502 No data received from server or forwarder");
1018 rsp->crunch_reason = NO_SERVER_DATA;
1021 if (rsp->status == NULL)
1024 free_http_response(rsp);
1025 return cgi_error_memory();
1028 err = template_fill_for_cgi(csp, templatename, exports, rsp);
1031 free_http_response(rsp);
1032 return cgi_error_memory();
1035 return finish_http_response(csp, rsp);
1039 /*********************************************************************
1041 * Function : cgi_error_disabled
1043 * Description : CGI function that is called to generate an error
1044 * response if the actions editor or toggle CGI are
1045 * accessed despite having being disabled at compile-
1046 * or run-time, or if the user followed an untrusted link
1047 * to access a unsafe CGI feature that is only reachable
1048 * through Privoxy directly.
1051 * 1 : csp = Current client state (buffers, headers, etc...)
1052 * 2 : rsp = http_response data structure for output
1054 * CGI Parameters : none
1056 * Returns : JB_ERR_OK on success
1057 * JB_ERR_MEMORY on out-of-memory error.
1059 *********************************************************************/
1060 jb_err cgi_error_disabled(const struct client_state *csp,
1061 struct http_response *rsp)
1063 struct map *exports;
1068 if (NULL == (exports = default_exports(csp, "cgi-error-disabled")))
1070 return JB_ERR_MEMORY;
1072 if (map(exports, "url", 1, html_encode(csp->http->url), 0))
1074 /* Not important enough to do anything */
1075 log_error(LOG_LEVEL_ERROR, "Failed to fill in url.");
1078 return template_fill_for_cgi(csp, "cgi-error-disabled", exports, rsp);
1082 /*********************************************************************
1084 * Function : cgi_init_error_messages
1086 * Description : Call at the start of the program to initialize
1087 * the error message used by cgi_error_memory().
1093 *********************************************************************/
1094 void cgi_init_error_messages(void)
1096 memset(cgi_error_memory_response, '\0', sizeof(*cgi_error_memory_response));
1097 cgi_error_memory_response->head =
1098 "HTTP/1.0 500 Internal Privoxy Error\r\n"
1099 "Content-Type: text/html\r\n"
1101 cgi_error_memory_response->body =
1104 " <title>500 Internal Privoxy Error</title>\n"
1105 " <link rel=\"shortcut icon\" href=\"" CGI_PREFIX "error-favicon.ico\" type=\"image/x-icon\">"
1108 "<h1>500 Internal Privoxy Error</h1>\n"
1109 "<p>Privoxy <b>ran out of memory</b> while processing your request.</p>\n"
1110 "<p>Please contact your proxy administrator, or try again later</p>\n"
1114 cgi_error_memory_response->head_length =
1115 strlen(cgi_error_memory_response->head);
1116 cgi_error_memory_response->content_length =
1117 strlen(cgi_error_memory_response->body);
1118 cgi_error_memory_response->crunch_reason = OUT_OF_MEMORY;
1122 /*********************************************************************
1124 * Function : cgi_error_memory
1126 * Description : Called if a CGI function runs out of memory.
1127 * Returns a statically-allocated error response.
1131 * Returns : http_response data structure for output. This is
1132 * statically allocated, for obvious reasons.
1134 *********************************************************************/
1135 struct http_response *cgi_error_memory(void)
1137 /* assert that it's been initialized. */
1138 assert(cgi_error_memory_response->head);
1140 return cgi_error_memory_response;
1144 /*********************************************************************
1146 * Function : cgi_error_no_template
1148 * Description : Almost-CGI function that is called if a template
1149 * cannot be loaded. Note this is not a true CGI,
1150 * it takes a template name rather than a map of
1154 * 1 : csp = Current client state (buffers, headers, etc...)
1155 * 2 : rsp = http_response data structure for output
1156 * 3 : template_name = Name of template that could not
1159 * Returns : JB_ERR_OK on success
1160 * JB_ERR_MEMORY on out-of-memory error.
1162 *********************************************************************/
1163 jb_err cgi_error_no_template(const struct client_state *csp,
1164 struct http_response *rsp,
1165 const char *template_name)
1167 static const char status[] =
1168 "500 Internal Privoxy Error";
1169 static const char body_prefix[] =
1172 " <title>500 Internal Privoxy Error</title>\n"
1173 " <link rel=\"shortcut icon\" href=\"" CGI_PREFIX "error-favicon.ico\" type=\"image/x-icon\">"
1176 "<h1>500 Internal Privoxy Error</h1>\n"
1177 "<p>Privoxy encountered an error while processing your request:</p>\n"
1178 "<p><b>Could not load template file <code>";
1179 static const char body_suffix[] =
1180 "</code> or one of its included components.</b></p>\n"
1181 "<p>Please contact your proxy administrator.</p>\n"
1182 "<p>If you are the proxy administrator, please put the required file(s)"
1183 "in the <code><i>(confdir)</i>/templates</code> directory. The "
1184 "location of the <code><i>(confdir)</i></code> directory "
1185 "is specified in the main Privoxy <code>config</code> "
1186 "file. (It's typically the Privoxy install directory"
1188 ", or <code>/etc/privoxy/</code>"
1189 #endif /* ndef _WIN32 */
1193 const size_t body_size = strlen(body_prefix) + strlen(template_name) + strlen(body_suffix) + 1;
1197 assert(template_name);
1199 /* Reset rsp, if needed */
1203 rsp->content_length = 0;
1204 rsp->head_length = 0;
1207 rsp->body = malloc_or_die(body_size);
1208 strlcpy(rsp->body, body_prefix, body_size);
1209 strlcat(rsp->body, template_name, body_size);
1210 strlcat(rsp->body, body_suffix, body_size);
1212 rsp->status = strdup(status);
1213 if (rsp->status == NULL)
1215 return JB_ERR_MEMORY;
1222 /*********************************************************************
1224 * Function : cgi_error_unknown
1226 * Description : Almost-CGI function that is called if an unexpected
1227 * error occurs in the top-level CGI dispatcher.
1228 * In this context, "unexpected" means "anything other
1229 * than JB_ERR_MEMORY or JB_ERR_CGI_PARAMS" - CGIs are
1230 * expected to handle all other errors internally,
1231 * since they can give more relavent error messages
1234 * Note this is not a true CGI, it takes an error
1235 * code rather than a map of parameters.
1238 * 1 : csp = Current client state (buffers, headers, etc...)
1239 * 2 : rsp = http_response data structure for output
1240 * 3 : error_to_report = Error code to report.
1242 * Returns : JB_ERR_OK on success
1243 * JB_ERR_MEMORY on out-of-memory error.
1245 *********************************************************************/
1246 jb_err cgi_error_unknown(const struct client_state *csp,
1247 struct http_response *rsp,
1248 jb_err error_to_report)
1250 static const char status[] =
1251 "500 Internal Privoxy Error";
1252 static const char body_prefix[] =
1255 " <title>500 Internal Privoxy Error</title>\n"
1256 " <link rel=\"shortcut icon\" href=\"" CGI_PREFIX "error-favicon.ico\" type=\"image/x-icon\">"
1259 "<h1>500 Internal Privoxy Error</h1>\n"
1260 "<p>Privoxy encountered an error while processing your request:</p>\n"
1261 "<p><b>Unexpected internal error: ";
1262 static const char body_suffix[] =
1265 "<a href=\"http://sourceforge.net/tracker/?group_id=11118&atid=111118\">"
1266 "file a bug report</a>.</p>\n"
1269 /* Includes room for larger error numbers in the future. */
1270 const size_t body_size = sizeof(body_prefix) + sizeof(body_suffix) + 5;
1274 /* Reset rsp, if needed */
1278 rsp->content_length = 0;
1279 rsp->head_length = 0;
1281 rsp->crunch_reason = INTERNAL_ERROR;
1283 rsp->body = malloc_or_die(body_size);
1285 snprintf(rsp->body, body_size, "%s%d%s", body_prefix, error_to_report, body_suffix);
1287 rsp->status = strdup(status);
1288 if (rsp->status == NULL)
1290 return JB_ERR_MEMORY;
1297 /*********************************************************************
1299 * Function : cgi_error_bad_param
1301 * Description : CGI function that is called if the parameters
1302 * (query string) for a CGI were wrong.
1305 * 1 : csp = Current client state (buffers, headers, etc...)
1306 * 2 : rsp = http_response data structure for output
1308 * CGI Parameters : none
1310 * Returns : JB_ERR_OK on success
1311 * JB_ERR_MEMORY on out-of-memory error.
1313 *********************************************************************/
1314 jb_err cgi_error_bad_param(const struct client_state *csp,
1315 struct http_response *rsp)
1317 struct map *exports;
1322 if (NULL == (exports = default_exports(csp, NULL)))
1324 return JB_ERR_MEMORY;
1327 return template_fill_for_cgi(csp, "cgi-error-bad-param", exports, rsp);
1331 /*********************************************************************
1333 * Function : cgi_redirect
1335 * Description : CGI support function to generate a HTTP redirect
1339 * 1 : rsp = http_response data structure for output
1340 * 2 : target = string with the target URL
1342 * CGI Parameters : None
1344 * Returns : JB_ERR_OK on success
1345 * JB_ERR_MEMORY on out-of-memory error.
1347 *********************************************************************/
1348 jb_err cgi_redirect (struct http_response * rsp, const char *target)
1355 err = enlist_unique_header(rsp->headers, "Location", target);
1357 rsp->status = strdup("302 Local Redirect from Privoxy");
1358 if (rsp->status == NULL)
1360 return JB_ERR_MEMORY;
1367 /*********************************************************************
1369 * Function : add_help_link
1371 * Description : Produce a copy of the string given as item,
1372 * embedded in an HTML link to its corresponding
1373 * section (item name in uppercase) in the actions
1374 * chapter of the user manual, (whose URL is given in
1375 * the config and defaults to our web site).
1377 * FIXME: I currently only work for actions, and would
1378 * like to be generalized for other topics.
1381 * 1 : item = item (will NOT be free()d.)
1382 * It is assumed to be HTML-safe.
1383 * 2 : config = The current configuration.
1385 * Returns : String with item embedded in link, or NULL on
1388 *********************************************************************/
1389 char *add_help_link(const char *item,
1390 struct configuration_spec *config)
1394 if (!item) return NULL;
1396 result = strdup("<a href=\"");
1397 if (!strncmpic(config->usermanual, "file://", 7) ||
1398 !strncmpic(config->usermanual, "http", 4))
1400 string_append(&result, config->usermanual);
1404 string_append(&result, "http://");
1405 string_append(&result, CGI_SITE_2_HOST);
1406 string_append(&result, "/user-manual/");
1408 string_append(&result, ACTIONS_HELP_PREFIX);
1409 string_join (&result, string_toupper(item));
1410 string_append(&result, "\">");
1411 string_append(&result, item);
1412 string_append(&result, "</a>");
1418 /*********************************************************************
1420 * Function : get_http_time
1422 * Description : Get the time in a format suitable for use in a
1423 * HTTP header - e.g.:
1424 * "Sun, 06 Nov 1994 08:49:37 GMT"
1427 * 1 : time_offset = Time returned will be current time
1428 * plus this number of seconds.
1429 * 2 : buf = Destination for result.
1430 * 3 : buffer_size = Size of the buffer above. Must be big
1431 * enough to hold 29 characters plus a
1436 *********************************************************************/
1437 void get_http_time(int time_offset, char *buf, size_t buffer_size)
1440 time_t current_time;
1441 #if defined(HAVE_GMTIME_R)
1446 assert(buffer_size > (size_t)29);
1448 time(¤t_time);
1450 current_time += time_offset;
1452 /* get and save the gmt */
1454 t = gmtime_r(¤t_time, &dummy);
1455 #elif defined(MUTEX_LOCKS_AVAILABLE)
1456 privoxy_mutex_lock(&gmtime_mutex);
1457 t = gmtime(¤t_time);
1458 privoxy_mutex_unlock(&gmtime_mutex);
1460 t = gmtime(¤t_time);
1463 strftime(buf, buffer_size, "%a, %d %b %Y %H:%M:%S GMT", t);
1467 /*********************************************************************
1469 * Function : get_locale_time
1471 * Description : Get the time in a date(1)-like format
1472 * according to the current locale - e.g.:
1473 * "Fri Aug 29 19:37:12 CEST 2008"
1475 * XXX: Should we allow the user to change the format?
1478 * 1 : buf = Destination for result.
1479 * 2 : buffer_size = Size of the buffer above. Must be big
1480 * enough to hold 29 characters plus a
1485 *********************************************************************/
1486 static void get_locale_time(char *buf, size_t buffer_size)
1489 time_t current_time;
1490 #if defined(HAVE_LOCALTIME_R)
1495 assert(buffer_size > (size_t)29);
1497 time(¤t_time);
1499 #if HAVE_LOCALTIME_R
1500 timeptr = localtime_r(¤t_time, &dummy);
1501 #elif defined(MUTEX_LOCKS_AVAILABLE)
1502 privoxy_mutex_lock(&localtime_mutex);
1503 timeptr = localtime(¤t_time);
1504 privoxy_mutex_unlock(&localtime_mutex);
1506 timeptr = localtime(¤t_time);
1509 strftime(buf, buffer_size, "%a %b %d %X %Z %Y", timeptr);
1514 #ifdef FEATURE_COMPRESSION
1515 /*********************************************************************
1517 * Function : compress_buffer
1519 * Description : Compresses the content of a buffer with zlib's deflate
1520 * Allocates a new buffer for the result, free'ing it is
1524 * 1 : buffer = buffer whose content should be compressed
1525 * 2 : buffer_length = length of the buffer
1526 * 3 : compression_level = compression level for compress2()
1528 * Returns : NULL on error, otherwise a pointer to the compressed
1529 * content of the input buffer.
1531 *********************************************************************/
1532 char *compress_buffer(char *buffer, size_t *buffer_length, int compression_level)
1534 char *compressed_buffer;
1536 assert(-1 <= compression_level && compression_level <= 9);
1538 /* Let zlib figure out the maximum length of the compressed data */
1539 new_length = compressBound((uLongf)*buffer_length);
1541 compressed_buffer = malloc_or_die(new_length);
1543 if (Z_OK != compress2((Bytef *)compressed_buffer, &new_length,
1544 (Bytef *)buffer, *buffer_length, compression_level))
1546 log_error(LOG_LEVEL_ERROR,
1547 "compress2() failed. Buffer size: %d, compression level: %d.",
1548 new_length, compression_level);
1549 freez(compressed_buffer);
1553 log_error(LOG_LEVEL_RE_FILTER,
1554 "Compressed content from %d to %d bytes. Compression level: %d",
1555 *buffer_length, new_length, compression_level);
1557 *buffer_length = (size_t)new_length;
1559 return compressed_buffer;
1565 /*********************************************************************
1567 * Function : finish_http_response
1569 * Description : Fill in the missing headers in an http response,
1570 * and flatten the headers to an http head.
1571 * For HEAD requests the body is freed once
1572 * the Content-Length header is set.
1575 * 1 : rsp = pointer to http_response to be processed
1577 * Returns : A http_response, usually the rsp parameter.
1578 * On error, free()s rsp and returns cgi_error_memory()
1580 *********************************************************************/
1581 struct http_response *finish_http_response(struct client_state *csp, struct http_response *rsp)
1583 char buf[BUFFER_SIZE];
1586 /* Special case - do NOT change this statically allocated response,
1587 * which is ready for output anyway.
1589 if (rsp == cgi_error_memory_response)
1595 * Fill in the HTTP Status, using HTTP/1.1
1596 * unless the client asked for HTTP/1.0.
1598 snprintf(buf, sizeof(buf), "%s %s",
1599 strcmpic(csp->http->ver, "HTTP/1.0") ? "HTTP/1.1" : "HTTP/1.0",
1600 rsp->status ? rsp->status : "200 OK");
1601 err = enlist_first(rsp->headers, buf);
1604 * Set the Content-Length
1606 if (rsp->content_length == 0)
1608 rsp->content_length = rsp->body ? strlen(rsp->body) : 0;
1611 #ifdef FEATURE_COMPRESSION
1612 if (!err && (csp->flags & CSP_FLAG_CLIENT_SUPPORTS_DEFLATE)
1613 && (rsp->content_length > LOWER_LENGTH_LIMIT_FOR_COMPRESSION))
1615 char *compressed_content;
1617 compressed_content = compress_buffer(rsp->body, &rsp->content_length,
1618 csp->config->compression_level);
1619 if (NULL != compressed_content)
1622 rsp->body = compressed_content;
1623 err = enlist_unique_header(rsp->headers, "Content-Encoding", "deflate");
1630 snprintf(buf, sizeof(buf), "Content-Length: %d", (int)rsp->content_length);
1632 * Signal serve() that the client will be able to figure out
1633 * the end of the response without having to close the connection.
1635 csp->flags |= CSP_FLAG_SERVER_CONTENT_LENGTH_SET;
1636 err = enlist(rsp->headers, buf);
1639 if (0 == strcmpic(csp->http->gpc, "head"))
1642 * The client only asked for the head. Dispose
1643 * the body and log an offensive message.
1645 * While it may seem to be a bit inefficient to
1646 * prepare the body if it isn't needed, it's the
1647 * only way to get the Content-Length right for
1648 * dynamic pages. We could have disposed the body
1649 * earlier, but not without duplicating the
1650 * Content-Length setting code above.
1652 log_error(LOG_LEVEL_CGI, "Preparing to give head to %s.", csp->ip_addr_str);
1654 rsp->content_length = 0;
1657 if (strncmpic(rsp->status, "302", 3))
1660 * If it's not a redirect without any content,
1661 * set the Content-Type to text/html if it's
1662 * not already specified.
1664 if (!err) err = enlist_unique(rsp->headers, "Content-Type: text/html", 13);
1668 * Fill in the rest of the default headers:
1670 * Date: set to current date/time.
1671 * Last-Modified: set to date/time the page was last changed.
1672 * Expires: set to date/time page next needs reloading.
1673 * Cache-Control: set to "no-cache" if applicable.
1675 * See http://www.w3.org/Protocols/rfc2068/rfc2068
1680 * Set Expires to about 10 min into the future so it'll get reloaded
1681 * occasionally, e.g. if Privoxy gets upgraded.
1686 get_http_time(0, buf, sizeof(buf));
1687 err = enlist_unique_header(rsp->headers, "Date", buf);
1690 /* Some date in the past. */
1691 if (!err) err = enlist_unique_header(rsp->headers, "Last-Modified", "Sat, 17 Jun 2000 12:00:00 GMT");
1695 get_http_time(10 * 60, buf, sizeof(buf)); /* 10 * 60sec = 10 minutes */
1696 err = enlist_unique_header(rsp->headers, "Expires", buf);
1699 else if (!strncmpic(rsp->status, "302", 3))
1701 get_http_time(0, buf, sizeof(buf));
1702 if (!err) err = enlist_unique_header(rsp->headers, "Date", buf);
1707 * Setting "Cache-Control" to "no-cache" and "Expires" to
1708 * the current time doesn't exactly forbid caching, it just
1709 * requires the client to revalidate the cached copy.
1711 * If a temporary problem occurs and the user tries again after
1712 * getting Privoxy's error message, a compliant browser may set the
1713 * If-Modified-Since header with the content of the error page's
1714 * Last-Modified header. More often than not, the document on the server
1715 * is older than Privoxy's error message, the server would send status code
1716 * 304 and the browser would display the outdated error message again and again.
1718 * For documents delivered with status code 403, 404 and 503 we set "Last-Modified"
1719 * to Tim Berners-Lee's birthday, which predates the age of any page on the web
1720 * and can be safely used to "revalidate" without getting a status code 304.
1722 * There is no need to let the useless If-Modified-Since header reach the
1723 * server, it is therefore stripped by client_if_modified_since in parsers.c.
1725 if (!err) err = enlist_unique_header(rsp->headers, "Cache-Control", "no-cache");
1727 get_http_time(0, buf, sizeof(buf));
1728 if (!err) err = enlist_unique_header(rsp->headers, "Date", buf);
1729 if (!strncmpic(rsp->status, "403", 3)
1730 || !strncmpic(rsp->status, "404", 3)
1731 || !strncmpic(rsp->status, "502", 3)
1732 || !strncmpic(rsp->status, "503", 3)
1733 || !strncmpic(rsp->status, "504", 3))
1735 if (!err) err = enlist_unique_header(rsp->headers, "Last-Modified", "Wed, 08 Jun 1955 12:00:00 GMT");
1739 if (!err) err = enlist_unique_header(rsp->headers, "Last-Modified", buf);
1741 if (!err) err = enlist_unique_header(rsp->headers, "Expires", "Sat, 17 Jun 2000 12:00:00 GMT");
1742 if (!err) err = enlist_unique_header(rsp->headers, "Pragma", "no-cache");
1745 if (!err && (!(csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE)
1746 || (csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED)))
1748 err = enlist_unique_header(rsp->headers, "Connection", "close");
1754 if (err || (NULL == (rsp->head = list_to_text(rsp->headers))))
1756 free_http_response(rsp);
1757 return cgi_error_memory();
1759 rsp->head_length = strlen(rsp->head);
1766 /*********************************************************************
1768 * Function : alloc_http_response
1770 * Description : Allocates a new http_response structure.
1774 * Returns : pointer to a new http_response, or NULL.
1776 *********************************************************************/
1777 struct http_response *alloc_http_response(void)
1779 return (struct http_response *) zalloc(sizeof(struct http_response));
1784 /*********************************************************************
1786 * Function : free_http_response
1788 * Description : Free the memory occupied by an http_response
1789 * and its depandant structures.
1792 * 1 : rsp = pointer to http_response to be freed
1796 *********************************************************************/
1797 void free_http_response(struct http_response *rsp)
1800 * Must special case cgi_error_memory_response, which is never freed.
1802 if (rsp && (rsp != cgi_error_memory_response))
1807 destroy_list(rsp->headers);
1814 /*********************************************************************
1816 * Function : template_load
1818 * Description : CGI support function that loads a given HTML
1819 * template, ignoring comment lines and following
1820 * #include statements up to a depth of 1.
1823 * 1 : csp = Current client state (buffers, headers, etc...)
1824 * 2 : template_ptr = Destination for pointer to loaded
1826 * 3 : templatename = name of the HTML template to be used
1827 * 4 : recursive = Flag set if this function calls itself
1828 * following an #include statament
1830 * Returns : JB_ERR_OK on success
1831 * JB_ERR_MEMORY on out-of-memory error.
1832 * JB_ERR_FILE if the template file cannot be read
1834 *********************************************************************/
1835 jb_err template_load(const struct client_state *csp, char **template_ptr,
1836 const char *templatename, int recursive)
1839 char *templates_dir_path;
1842 char *included_module;
1845 char buf[BUFFER_SIZE];
1848 assert(template_ptr);
1849 assert(templatename);
1851 *template_ptr = NULL;
1853 /* Validate template name. Paranoia. */
1854 for (p = templatename; *p != 0; p++)
1856 if ( ((*p < 'a') || (*p > 'z'))
1857 && ((*p < 'A') || (*p > 'Z'))
1858 && ((*p < '0') || (*p > '9'))
1862 /* Illegal character */
1868 * Generate full path using either templdir
1869 * or confdir/templates as base directory.
1871 if (NULL != csp->config->templdir)
1873 templates_dir_path = strdup(csp->config->templdir);
1877 templates_dir_path = make_path(csp->config->confdir, "templates");
1880 if (templates_dir_path == NULL)
1882 log_error(LOG_LEVEL_ERROR, "Out of memory while generating template path for %s.",
1884 return JB_ERR_MEMORY;
1887 full_path = make_path(templates_dir_path, templatename);
1888 free(templates_dir_path);
1889 if (full_path == NULL)
1891 log_error(LOG_LEVEL_ERROR, "Out of memory while generating full template path for %s.",
1893 return JB_ERR_MEMORY;
1896 /* Allocate buffer */
1898 file_buffer = strdup("");
1899 if (file_buffer == NULL)
1901 log_error(LOG_LEVEL_ERROR, "Not enough free memory to buffer %s.", full_path);
1903 return JB_ERR_MEMORY;
1906 /* Open template file */
1908 if (NULL == (fp = fopen(full_path, "r")))
1910 log_error(LOG_LEVEL_ERROR, "Cannot open template file %s: %E", full_path);
1918 * Read the file, ignoring comments, and honoring #include
1919 * statements, unless we're already called recursively.
1921 * XXX: The comment handling could break with lines lengths > sizeof(buf).
1922 * This is unlikely in practise.
1924 while (fgets(buf, sizeof(buf), fp))
1926 if (!recursive && !strncmp(buf, "#include ", 9))
1928 if (JB_ERR_OK != (err = template_load(csp, &included_module, chomp(buf + 9), 1)))
1935 if (string_join(&file_buffer, included_module))
1938 return JB_ERR_MEMORY;
1944 /* skip lines starting with '#' */
1950 if (string_append(&file_buffer, buf))
1953 return JB_ERR_MEMORY;
1958 *template_ptr = file_buffer;
1964 /*********************************************************************
1966 * Function : template_fill
1968 * Description : CGI support function that fills in a pre-loaded
1969 * HTML template by replacing @name@ with value using
1970 * pcrs, for each item in the output map.
1972 * Note that a leading '$' character in the export map's
1973 * values will be stripped and toggle on backreference
1977 * 1 : template_ptr = IN: Template to be filled out.
1979 * OUT: Filled out template.
1980 * Caller must free().
1981 * 2 : exports = map with fill in symbol -> name pairs
1983 * Returns : JB_ERR_OK on success (and for uncritical errors)
1984 * JB_ERR_MEMORY on out-of-memory error
1986 *********************************************************************/
1987 jb_err template_fill(char **template_ptr, const struct map *exports)
1989 struct map_entry *m;
1991 char buf[BUFFER_SIZE];
1992 char *tmp_out_buffer;
1998 assert(template_ptr);
1999 assert(*template_ptr);
2002 file_buffer = *template_ptr;
2003 size = strlen(file_buffer) + 1;
2006 * Assemble pcrs joblist from exports map
2008 for (m = exports->first; m != NULL; m = m->next)
2010 if (*m->name == '$')
2013 * First character of name is '$', so remove this flag
2014 * character and allow backreferences ($1 etc) in the
2015 * "replace with" text.
2017 snprintf(buf, sizeof(buf), "%s", m->name + 1);
2023 * Treat the "replace with" text as a literal string -
2024 * no quoting needed, no backreferences allowed.
2025 * ("Trivial" ['T'] flag).
2029 /* Enclose name in @@ */
2030 snprintf(buf, sizeof(buf), "@%s@", m->name);
2033 log_error(LOG_LEVEL_CGI, "Substituting: s/%s/%s/%s", buf, m->value, flags);
2035 /* Make and run job. */
2036 job = pcrs_compile(buf, m->value, flags, &error);
2039 if (error == PCRS_ERR_NOMEM)
2042 *template_ptr = NULL;
2043 return JB_ERR_MEMORY;
2047 log_error(LOG_LEVEL_ERROR, "Error compiling template fill job %s: %d", m->name, error);
2048 /* Hope it wasn't important and silently ignore the invalid job */
2053 error = pcrs_execute(job, file_buffer, size, &tmp_out_buffer, &size);
2056 if (NULL == tmp_out_buffer)
2058 *template_ptr = NULL;
2059 return JB_ERR_MEMORY;
2065 * Substitution failed, keep the original buffer,
2066 * log the problem and ignore it.
2068 * The user might see some unresolved @CGI_VARIABLES@,
2069 * but returning a special CGI error page seems unreasonable
2070 * and could mask more important error messages.
2072 free(tmp_out_buffer);
2073 log_error(LOG_LEVEL_ERROR, "Failed to execute s/%s/%s/%s. %s",
2074 buf, m->value, flags, pcrs_strerror(error));
2078 /* Substitution succeeded, use modified buffer. */
2080 file_buffer = tmp_out_buffer;
2088 *template_ptr = file_buffer;
2093 /*********************************************************************
2095 * Function : template_fill_for_cgi
2097 * Description : CGI support function that loads a HTML template
2098 * and fills it in. Handles file-not-found errors
2099 * by sending a HTML error message. For convenience,
2100 * this function also frees the passed "exports" map.
2103 * 1 : csp = Client state
2104 * 2 : templatename = name of the HTML template to be used
2105 * 3 : exports = map with fill in symbol -> name pairs.
2106 * Will be freed by this function.
2107 * 4 : rsp = Response structure to fill in.
2109 * Returns : JB_ERR_OK on success
2110 * JB_ERR_MEMORY on out-of-memory error
2112 *********************************************************************/
2113 jb_err template_fill_for_cgi(const struct client_state *csp,
2114 const char *templatename,
2115 struct map *exports,
2116 struct http_response *rsp)
2121 assert(templatename);
2125 err = template_load(csp, &rsp->body, templatename, 0);
2126 if (err == JB_ERR_FILE)
2129 return cgi_error_no_template(csp, rsp, templatename);
2134 return err; /* JB_ERR_MEMORY */
2136 err = template_fill(&rsp->body, exports);
2142 /*********************************************************************
2144 * Function : default_exports
2146 * Description : returns a struct map list that contains exports
2147 * which are common to all CGI functions.
2150 * 1 : csp = Current client state (buffers, headers, etc...)
2151 * 2 : caller = name of CGI who calls us and which should
2152 * be excluded from the generated menu. May be
2154 * Returns : NULL if no memory, else a new map. Caller frees.
2156 *********************************************************************/
2157 struct map *default_exports(const struct client_state *csp, const char *caller)
2161 struct map * exports;
2162 int local_help_exists = 0;
2163 char *ip_address = NULL;
2165 char *hostname = NULL;
2169 exports = new_map();
2170 if (exports == NULL)
2175 if (csp->config->hostname)
2177 get_host_information(csp->cfd, &ip_address, &port, NULL);
2178 hostname = strdup(csp->config->hostname);
2182 get_host_information(csp->cfd, &ip_address, &port, &hostname);
2185 err = map(exports, "version", 1, html_encode(VERSION), 0);
2186 get_locale_time(buf, sizeof(buf));
2187 if (!err) err = map(exports, "time", 1, html_encode(buf), 0);
2188 if (!err) err = map(exports, "my-ip-address", 1, html_encode(ip_address ? ip_address : "unknown"), 0);
2190 if (!err) err = map(exports, "my-port", 1, html_encode(port ? port : "unknown"), 0);
2192 if (!err) err = map(exports, "my-hostname", 1, html_encode(hostname ? hostname : "unknown"), 0);
2194 if (!err) err = map(exports, "homepage", 1, html_encode(HOME_PAGE_URL), 0);
2195 if (!err) err = map(exports, "default-cgi", 1, html_encode(CGI_PREFIX), 0);
2196 if (!err) err = map(exports, "menu", 1, make_menu(caller, csp->config->feature_flags), 0);
2197 if (!err) err = map(exports, "code-status", 1, CODE_STATUS, 1);
2198 if (!strncmpic(csp->config->usermanual, "file://", 7) ||
2199 !strncmpic(csp->config->usermanual, "http", 4))
2201 /* Manual is located somewhere else, just link to it. */
2202 if (!err) err = map(exports, "user-manual", 1, html_encode(csp->config->usermanual), 0);
2206 /* Manual is delivered by Privoxy. */
2207 if (!err) err = map(exports, "user-manual", 1, html_encode(CGI_PREFIX"user-manual/"), 0);
2209 if (!err) err = map(exports, "actions-help-prefix", 1, ACTIONS_HELP_PREFIX ,1);
2210 #ifdef FEATURE_TOGGLE
2211 if (!err) err = map_conditional(exports, "enabled-display", global_toggle_state);
2213 if (!err) err = map_block_killer(exports, "can-toggle");
2216 if (!strcmp(CODE_STATUS, "stable"))
2218 if (!err) err = map_block_killer(exports, "unstable");
2221 if (csp->config->admin_address != NULL)
2223 if (!err) err = map(exports, "admin-address", 1, html_encode(csp->config->admin_address), 0);
2224 local_help_exists = 1;
2228 if (!err) err = map_block_killer(exports, "have-adminaddr-info");
2231 if (csp->config->proxy_info_url != NULL)
2233 if (!err) err = map(exports, "proxy-info-url", 1, html_encode(csp->config->proxy_info_url), 0);
2234 local_help_exists = 1;
2238 if (!err) err = map_block_killer(exports, "have-proxy-info");
2241 if (local_help_exists == 0)
2243 if (!err) err = map_block_killer(exports, "have-help-info");
2256 /*********************************************************************
2258 * Function : map_block_killer
2260 * Description : Convenience function.
2261 * Adds a "killer" for the conditional HTML-template
2262 * block <name>, i.e. a substitution of the regex
2263 * "if-<name>-start.*if-<name>-end" to the given
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_killer(struct map *exports, const char *name)
2276 char buf[1000]; /* Will do, since the names are hardwired */
2280 assert(strlen(name) < (size_t)490);
2282 snprintf(buf, sizeof(buf), "if-%s-start.*if-%s-end", name, name);
2283 return map(exports, buf, 1, "", 1);
2287 /*********************************************************************
2289 * Function : map_block_keep
2291 * Description : Convenience function. Removes the markers used
2292 * by map-block-killer, to save a few bytes.
2293 * i.e. removes "@if-<name>-start@" and "@if-<name>-end@"
2296 * 1 : exports = map to extend
2297 * 2 : name = name of conditional block
2299 * Returns : JB_ERR_OK on success
2300 * JB_ERR_MEMORY on out-of-memory error.
2302 *********************************************************************/
2303 jb_err map_block_keep(struct map *exports, const char *name)
2306 char buf[500]; /* Will do, since the names are hardwired */
2310 assert(strlen(name) < (size_t)490);
2312 snprintf(buf, sizeof(buf), "if-%s-start", name);
2313 err = map(exports, buf, 1, "", 1);
2320 snprintf(buf, sizeof(buf), "if-%s-end", name);
2321 return map(exports, buf, 1, "", 1);
2325 /*********************************************************************
2327 * Function : map_conditional
2329 * Description : Convenience function.
2330 * Adds an "if-then-else" for the conditional HTML-template
2331 * block <name>, i.e. a substitution of the form:
2338 * The control structure and one of the alternatives
2342 * 1 : exports = map to extend
2343 * 2 : name = name of conditional block
2344 * 3 : choose_first = nonzero for first, zero for second.
2346 * Returns : JB_ERR_OK on success
2347 * JB_ERR_MEMORY on out-of-memory error.
2349 *********************************************************************/
2350 jb_err map_conditional(struct map *exports, const char *name, int choose_first)
2352 char buf[1000]; /* Will do, since the names are hardwired */
2357 assert(strlen(name) < (size_t)480);
2359 snprintf(buf, sizeof(buf), (choose_first
2360 ? "else-not-%s@.*@endif-%s"
2361 : "if-%s-then@.*@else-not-%s"),
2364 err = map(exports, buf, 1, "", 1);
2370 snprintf(buf, sizeof(buf), (choose_first ? "if-%s-then" : "endif-%s"), name);
2371 return map(exports, buf, 1, "", 1);
2375 /*********************************************************************
2377 * Function : make_menu
2379 * Description : Returns an HTML-formatted menu of the available
2380 * unhidden CGIs, excluding the one given in <self>
2381 * and the toggle CGI if toggling is disabled.
2384 * 1 : self = name of CGI to leave out, can be NULL for
2386 * 2 : feature_flags = feature bitmap from csp->config
2389 * Returns : menu string, or NULL on out-of-memory error.
2391 *********************************************************************/
2392 char *make_menu(const char *self, const unsigned feature_flags)
2394 const struct cgi_dispatcher *d;
2395 char *result = strdup("");
2399 self = "NO-SUCH-CGI!";
2402 /* List available unhidden CGI's and export as "other-cgis" */
2403 for (d = cgi_dispatchers; d->name; d++)
2406 #ifdef FEATURE_TOGGLE
2407 if (!(feature_flags & RUNTIME_FEATURE_CGI_TOGGLE) && !strcmp(d->name, "toggle"))
2410 * Suppress the toggle link if remote toggling is disabled.
2414 #endif /* def FEATURE_TOGGLE */
2416 if (d->description && strcmp(d->name, self))
2418 char *html_encoded_prefix;
2421 * Line breaks would be great, but break
2422 * the "blocked" template's JavaScript.
2424 string_append(&result, "<li><a href=\"");
2425 html_encoded_prefix = html_encode(CGI_PREFIX);
2426 if (html_encoded_prefix == NULL)
2432 string_append(&result, html_encoded_prefix);
2433 free(html_encoded_prefix);
2435 string_append(&result, d->name);
2436 string_append(&result, "\">");
2437 string_append(&result, d->description);
2438 string_append(&result, "</a></li>");
2446 /*********************************************************************
2448 * Function : dump_map
2450 * Description : HTML-dump a map for debugging (as table)
2453 * 1 : the_map = map to dump
2455 * Returns : string with HTML
2457 *********************************************************************/
2458 char *dump_map(const struct map *the_map)
2460 struct map_entry *cur_entry;
2461 char *ret = strdup("");
2463 string_append(&ret, "<table>\n");
2465 for (cur_entry = the_map->first;
2466 (cur_entry != NULL) && (ret != NULL);
2467 cur_entry = cur_entry->next)
2469 string_append(&ret, "<tr><td><b>");
2470 string_join (&ret, html_encode(cur_entry->name));
2471 string_append(&ret, "</b></td><td>");
2472 string_join (&ret, html_encode(cur_entry->value));
2473 string_append(&ret, "</td></tr>\n");
2476 string_append(&ret, "</table>\n");