const char cgi_rcs[] = "$Id: cgi.c,v 1.149 2012/03/09 16:24:36 fabiankeil Exp $"; /********************************************************************* * * File : $Source: /cvsroot/ijbswa/current/cgi.c,v $ * * Purpose : Declares functions to intercept request, generate * html or gif answers, and to compose HTTP resonses. * This only contains the framework functions, the * actual handler functions are declared elsewhere. * * Copyright : Written by and Copyright (C) 2001-2004, 2006-2008 * the SourceForge Privoxy team. http://www.privoxy.org/ * * Based on the Internet Junkbuster originally written * by and Copyright (C) 1997 Anonymous Coders and * Junkbusters Corporation. http://www.junkbusters.com * * This program is free software; you can redistribute it * and/or modify it under the terms of the GNU General * Public License as published by the Free Software * Foundation; either version 2 of the License, or (at * your option) any later version. * * This program is distributed in the hope that it will * be useful, but WITHOUT ANY WARRANTY; without even the * implied warranty of MERCHANTABILITY or FITNESS FOR A * PARTICULAR PURPOSE. See the GNU General Public * License for more details. * * The GNU General Public License should be included with * this file. If not, you can view it at * http://www.gnu.org/copyleft/gpl.html * or write to the Free Software Foundation, Inc., 59 * Temple Place - Suite 330, Boston, MA 02111-1307, USA. * **********************************************************************/ #include "config.h" #include #include #include #include #include #include #include #ifdef FEATURE_COMPRESSION #include #endif #include "project.h" #include "cgi.h" #include "list.h" #include "encode.h" #include "ssplit.h" #include "errlog.h" #include "filters.h" #include "miscutil.h" #include "cgisimple.h" #include "jbsockets.h" #if defined(FEATURE_CGI_EDIT_ACTIONS) || defined(FEATURE_TOGGLE) #include "cgiedit.h" #endif /* defined(FEATURE_CGI_EDIT_ACTIONS) || defined (FEATURE_TOGGLE) */ /* loadcfg.h is for global_toggle_state only */ #include "loadcfg.h" /* jcc.h is for mutex semaphore globals only */ #include "jcc.h" const char cgi_h_rcs[] = CGI_H_VERSION; /* * List of CGI functions: name, handler, description * Note: Do NOT use single quotes in the description; * this will break the dynamic "blocked" template! */ static const struct cgi_dispatcher cgi_dispatchers[] = { { "", cgi_default, "Privoxy main page", TRUE }, #ifdef FEATURE_GRACEFUL_TERMINATION { "die", cgi_die, "Shut down - Do not deploy this build in a production environment, " "this is a one click Denial Of Service attack!!!", FALSE }, #endif { "show-status", cgi_show_status, #ifdef FEATURE_CGI_EDIT_ACTIONS "View & change the current configuration", #else "View the current configuration", #endif TRUE }, { "show-version", cgi_show_version, "View the source code version numbers", TRUE }, { "show-request", cgi_show_request, "View the request headers", TRUE }, { "show-url-info", cgi_show_url_info, "Look up which actions apply to a URL and why", TRUE }, #ifdef FEATURE_TOGGLE { "toggle", cgi_toggle, "Toggle Privoxy on or off", FALSE }, #endif /* def FEATURE_TOGGLE */ #ifdef FEATURE_CGI_EDIT_ACTIONS { "edit-actions", /* Edit the actions list */ cgi_edit_actions, NULL, FALSE }, { "eaa", /* Shortcut for edit-actions-add-url-form */ cgi_edit_actions_add_url_form, NULL, FALSE }, { "eau", /* Shortcut for edit-actions-url-form */ cgi_edit_actions_url_form, NULL, FALSE }, { "ear", /* Shortcut for edit-actions-remove-url-form */ cgi_edit_actions_remove_url_form, NULL, FALSE }, { "eal", /* Shortcut for edit-actions-list */ cgi_edit_actions_list, NULL, FALSE }, { "eafu", /* Shortcut for edit-actions-for-url */ cgi_edit_actions_for_url, NULL, FALSE }, { "eas", /* Shortcut for edit-actions-submit */ cgi_edit_actions_submit, NULL, FALSE }, { "easa", /* Shortcut for edit-actions-section-add */ cgi_edit_actions_section_add, NULL, FALSE }, { "easr", /* Shortcut for edit-actions-section-remove */ cgi_edit_actions_section_remove, NULL, FALSE }, { "eass", /* Shortcut for edit-actions-section-swap */ cgi_edit_actions_section_swap, NULL, FALSE }, { "edit-actions-for-url", cgi_edit_actions_for_url, NULL, FALSE /* Edit the actions for (a) specified URL(s) */ }, { "edit-actions-list", cgi_edit_actions_list, NULL, TRUE /* Edit the actions list */ }, { "edit-actions-submit", cgi_edit_actions_submit, NULL, FALSE /* Change the actions for (a) specified URL(s) */ }, { "edit-actions-url", cgi_edit_actions_url, NULL, FALSE /* Change a URL pattern in the actionsfile */ }, { "edit-actions-url-form", cgi_edit_actions_url_form, NULL, FALSE /* Form to change a URL pattern in the actionsfile */ }, { "edit-actions-add-url", cgi_edit_actions_add_url, NULL, FALSE /* Add a URL pattern to the actionsfile */ }, { "edit-actions-add-url-form", cgi_edit_actions_add_url_form, NULL, FALSE /* Form to add a URL pattern to the actionsfile */ }, { "edit-actions-remove-url", cgi_edit_actions_remove_url, NULL, FALSE /* Remove a URL pattern from the actionsfile */ }, { "edit-actions-remove-url-form", cgi_edit_actions_remove_url_form, NULL, FALSE /* Form to remove a URL pattern from the actionsfile */ }, { "edit-actions-section-add", cgi_edit_actions_section_add, NULL, FALSE /* Remove a section from the actionsfile */ }, { "edit-actions-section-remove", cgi_edit_actions_section_remove, NULL, FALSE /* Remove a section from the actionsfile */ }, { "edit-actions-section-swap", cgi_edit_actions_section_swap, NULL, FALSE /* Swap two sections in the actionsfile */ }, #endif /* def FEATURE_CGI_EDIT_ACTIONS */ { "error-favicon.ico", cgi_send_error_favicon, NULL, TRUE /* Sends the favicon image for error pages. */ }, { "favicon.ico", cgi_send_default_favicon, NULL, TRUE /* Sends the default favicon image. */ }, { "robots.txt", cgi_robots_txt, NULL, TRUE /* Sends a robots.txt file to tell robots to go away. */ }, { "send-banner", cgi_send_banner, NULL, TRUE /* Send a built-in image */ }, { "send-stylesheet", cgi_send_stylesheet, NULL, FALSE /* Send templates/cgi-style.css */ }, { "t", cgi_transparent_image, NULL, TRUE /* Send a transparent image (short name) */ }, { "url-info-osd.xml", cgi_send_url_info_osd, NULL, TRUE /* Send templates/url-info-osd.xml */ }, { "user-manual", cgi_send_user_manual, NULL, TRUE /* Send user-manual */ }, { NULL, /* NULL Indicates end of list and default page */ cgi_error_404, NULL, TRUE /* Unknown CGI page */ } }; /* * Built-in images for ad replacement * * Hint: You can encode your own images like this: * cat your-image | perl -e 'while (read STDIN, $c, 1) { printf("\\%.3o", unpack("C", $c)); }' */ #ifdef FEATURE_NO_GIFS /* * Checkerboard pattern, as a PNG. */ const char image_pattern_data[] = "\211\120\116\107\015\012\032\012\000\000\000\015\111\110\104" "\122\000\000\000\004\000\000\000\004\010\006\000\000\000\251" "\361\236\176\000\000\000\006\142\113\107\104\000\000\000\000" "\000\000\371\103\273\177\000\000\000\033\111\104\101\124\010" "\327\143\140\140\140\060\377\377\377\077\003\234\106\341\060" "\060\230\063\020\124\001\000\161\021\031\241\034\364\030\143" "\000\000\000\000\111\105\116\104\256\102\140\202"; /* * 1x1 transparant PNG. */ const char image_blank_data[] = "\211\120\116\107\015\012\032\012\000\000\000\015\111\110\104\122" "\000\000\000\001\000\000\000\001\001\003\000\000\000\045\333\126" "\312\000\000\000\003\120\114\124\105\377\377\377\247\304\033\310" "\000\000\000\001\164\122\116\123\000\100\346\330\146\000\000\000" "\001\142\113\107\104\000\210\005\035\110\000\000\000\012\111\104" "\101\124\170\001\143\140\000\000\000\002\000\001\163\165\001\030" "\000\000\000\000\111\105\116\104\256\102\140\202"; #else /* * Checkerboard pattern, as a GIF. */ const char image_pattern_data[] = "\107\111\106\070\071\141\004\000\004\000\200\000\000\310\310" "\310\377\377\377\041\376\016\111\040\167\141\163\040\141\040" "\142\141\156\156\145\162\000\041\371\004\001\012\000\001\000" "\054\000\000\000\000\004\000\004\000\000\002\005\104\174\147" "\270\005\000\073"; /* * 1x1 transparant GIF. */ const char image_blank_data[] = "GIF89a\001\000\001\000\200\000\000\377\377\377\000\000" "\000!\371\004\001\000\000\000\000,\000\000\000\000\001" "\000\001\000\000\002\002D\001\000;"; #endif const size_t image_pattern_length = sizeof(image_pattern_data) - 1; const size_t image_blank_length = sizeof(image_blank_data) - 1; #ifdef FEATURE_COMPRESSION /* * Minimum length which a buffer has to reach before * we bother to (re-)compress it. Completely arbitrary. */ const size_t LOWER_LENGTH_LIMIT_FOR_COMPRESSION = 1024U; #endif static struct http_response cgi_error_memory_response[1]; static struct http_response *dispatch_known_cgi(struct client_state * csp, const char * path); static struct map *parse_cgi_parameters(char *argstring); /********************************************************************* * * Function : dispatch_cgi * * Description : Checks if a request URL has either the magical * hostname CGI_SITE_1_HOST (usually http://p.p/) or * matches CGI_SITE_2_HOST CGI_SITE_2_PATH (usually * http://config.privoxy.org/). If so, it passes * the (rest of the) path onto dispatch_known_cgi, which * calls the relevant CGI handler function. * * Parameters : * 1 : csp = Current client state (buffers, headers, etc...) * * Returns : http_response if match, NULL if nonmatch or handler fail * *********************************************************************/ struct http_response *dispatch_cgi(struct client_state *csp) { const char *host = csp->http->host; const char *path = csp->http->path; /* * Should we intercept ? */ /* Note: "example.com" and "example.com." are equivalent hostnames. */ /* Either the host matches CGI_SITE_1_HOST ..*/ if ( ( (0 == strcmpic(host, CGI_SITE_1_HOST)) || (0 == strcmpic(host, CGI_SITE_1_HOST "."))) && (path[0] == '/')) { /* ..then the path will all be for us. Remove leading '/' */ path++; } /* Or it's the host part CGI_SITE_2_HOST, and the path CGI_SITE_2_PATH */ else if (( (0 == strcmpic(host, CGI_SITE_2_HOST)) || (0 == strcmpic(host, CGI_SITE_2_HOST "."))) && (0 == strncmpic(path, CGI_SITE_2_PATH, strlen(CGI_SITE_2_PATH)))) { /* take everything following CGI_SITE_2_PATH */ path += strlen(CGI_SITE_2_PATH); if (*path == '/') { /* skip the forward slash after CGI_SITE_2_PATH */ path++; } else if (*path != '\0') { /* * weirdness: URL is /configXXX, where XXX is some string * Do *NOT* intercept. */ return NULL; } } else { /* Not a CGI */ return NULL; } /* * This is a CGI call. */ return dispatch_known_cgi(csp, path); } /********************************************************************* * * Function : grep_cgi_referrer * * Description : Ugly provisorical fix that greps the value of the * referer HTTP header field out of a linked list of * strings like found at csp->headers. Will disappear * in Privoxy 3.1. * * FIXME: csp->headers ought to be csp->http->headers * FIXME: Parsing all client header lines should * happen right after the request is received! * * Parameters : * 1 : csp = Current client state (buffers, headers, etc...) * * Returns : pointer to value (no copy!), or NULL if none found. * *********************************************************************/ static char *grep_cgi_referrer(const struct client_state *csp) { struct list_entry *p; for (p = csp->headers->first; p != NULL; p = p->next) { if (p->str == NULL) continue; if (strncmpic(p->str, "Referer: ", 9) == 0) { return ((p->str) + 9); } } return NULL; } /********************************************************************* * * Function : referrer_is_safe * * Description : Decides whether we trust the Referer for * CGI pages which are only meant to be reachable * through Privoxy's web interface directly. * * Parameters : * 1 : csp = Current client state (buffers, headers, etc...) * * Returns : TRUE if the referrer is safe, or * FALSE if the referrer is unsafe or not set. * *********************************************************************/ static int referrer_is_safe(const struct client_state *csp) { char *referrer; static const char alternative_prefix[] = "http://" CGI_SITE_1_HOST "/"; referrer = grep_cgi_referrer(csp); if (NULL == referrer) { /* No referrer, no access */ log_error(LOG_LEVEL_ERROR, "Denying access to %s. No referrer found.", csp->http->url); } else if ((0 == strncmp(referrer, CGI_PREFIX, sizeof(CGI_PREFIX)-1) || (0 == strncmp(referrer, alternative_prefix, strlen(alternative_prefix))))) { /* Trustworthy referrer */ log_error(LOG_LEVEL_CGI, "Granting access to %s, referrer %s is trustworthy.", csp->http->url, referrer); return TRUE; } else { /* Untrustworthy referrer */ log_error(LOG_LEVEL_ERROR, "Denying access to %s, referrer %s isn't trustworthy.", csp->http->url, referrer); } return FALSE; } /********************************************************************* * * Function : dispatch_known_cgi * * Description : Processes a CGI once dispatch_cgi has determined that * it matches one of the magic prefixes. Parses the path * as a cgi name plus query string, prepares a map that * maps CGI parameter names to their values, initializes * the http_response struct, and calls the relevant CGI * handler function. * * Parameters : * 1 : csp = Current client state (buffers, headers, etc...) * 2 : path = Path of CGI, with the CGI prefix removed. * Should not have a leading "/". * * Returns : http_response, or NULL on handler failure or out of * memory. * *********************************************************************/ static struct http_response *dispatch_known_cgi(struct client_state * csp, const char * path) { const struct cgi_dispatcher *d; struct map *param_list; struct http_response *rsp; char *query_args_start; char *path_copy; jb_err err; if (NULL == (path_copy = strdup(path))) { return cgi_error_memory(); } query_args_start = path_copy; while (*query_args_start && *query_args_start != '?' && *query_args_start != '/') { query_args_start++; } if (*query_args_start == '/') { *query_args_start++ = '\0'; if ((param_list = new_map())) { map(param_list, "file", 1, url_decode(query_args_start), 0); } } else { if (*query_args_start == '?') { *query_args_start++ = '\0'; } if (NULL == (param_list = parse_cgi_parameters(query_args_start))) { free(path_copy); return cgi_error_memory(); } } /* * At this point: * path_copy = CGI call name * param_list = CGI params, as map */ /* Get mem for response or fail*/ if (NULL == (rsp = alloc_http_response())) { free(path_copy); free_map(param_list); return cgi_error_memory(); } /* * Find and start the right CGI function */ d = cgi_dispatchers; for (;;) { if ((d->name == NULL) || (strcmp(path_copy, d->name) == 0)) { /* * If the called CGI is either harmless, or referred * from a trusted source, start it. */ if (d->harmless || referrer_is_safe(csp)) { err = (d->handler)(csp, rsp, param_list); } else { /* * Else, modify toggle calls so that they only display * the status, and deny all other calls. */ if (0 == strcmp(path_copy, "toggle")) { unmap(param_list, "set"); err = (d->handler)(csp, rsp, param_list); } else { err = cgi_error_disabled(csp, rsp); } } free(path_copy); free_map(param_list); if (err == JB_ERR_CGI_PARAMS) { err = cgi_error_bad_param(csp, rsp); } if (err && (err != JB_ERR_MEMORY)) { /* Unexpected error! Shouldn't get here */ log_error(LOG_LEVEL_ERROR, "Unexpected CGI error %d in top-level handler. " "Please file a bug report!", err); err = cgi_error_unknown(csp, rsp, err); } if (!err) { /* It worked */ rsp->crunch_reason = CGI_CALL; return finish_http_response(csp, rsp); } else { /* Error in handler, probably out-of-memory */ free_http_response(rsp); return cgi_error_memory(); } } d++; } } /********************************************************************* * * Function : parse_cgi_parameters * * Description : Parse a URL-encoded argument string into name/value * pairs and store them in a struct map list. * * Parameters : * 1 : argstring = string to be parsed. Will be trashed. * * Returns : pointer to param list, or NULL if out of memory. * *********************************************************************/ static struct map *parse_cgi_parameters(char *argstring) { char *p; char *vector[BUFFER_SIZE]; int pairs, i; struct map *cgi_params; if (NULL == (cgi_params = new_map())) { return NULL; } /* * IE 5 does, of course, violate RFC 2316 Sect 4.1 and sends * the fragment identifier along with the request, so we must * cut it off here, so it won't pollute the CGI params: */ if (NULL != (p = strchr(argstring, '#'))) { *p = '\0'; } pairs = ssplit(argstring, "&", vector, SZ(vector), 1, 1); for (i = 0; i < pairs; i++) { if ((NULL != (p = strchr(vector[i], '='))) && (*(p+1) != '\0')) { *p = '\0'; if (map(cgi_params, url_decode(vector[i]), 0, url_decode(++p), 0)) { free_map(cgi_params); return NULL; } } } return cgi_params; } /********************************************************************* * * Function : get_char_param * * Description : Get a single-character parameter passed to a CGI * function. * * Parameters : * 1 : parameters = map of cgi parameters * 2 : param_name = The name of the parameter to read * * Returns : Uppercase character on success, '\0' on error. * *********************************************************************/ char get_char_param(const struct map *parameters, const char *param_name) { char ch; assert(parameters); assert(param_name); ch = *(lookup(parameters, param_name)); if ((ch >= 'a') && (ch <= 'z')) { ch = (char)(ch - 'a' + 'A'); } return ch; } /********************************************************************* * * Function : get_string_param * * Description : Get a string paramater, to be used as an * ACTION_STRING or ACTION_MULTI paramater. * Validates the input to prevent stupid/malicious * users from corrupting their action file. * * Parameters : * 1 : parameters = map of cgi parameters * 2 : param_name = The name of the parameter to read * 3 : pparam = destination for paramater. Allocated as * part of the map "parameters", so don't free it. * Set to NULL if not specified. * * Returns : JB_ERR_OK on success, or if the paramater * was not specified. * JB_ERR_MEMORY on out-of-memory. * JB_ERR_CGI_PARAMS if the paramater is not valid. * *********************************************************************/ jb_err get_string_param(const struct map *parameters, const char *param_name, const char **pparam) { const char *param; const char *s; char ch; assert(parameters); assert(param_name); assert(pparam); *pparam = NULL; param = lookup(parameters, param_name); if (!*param) { return JB_ERR_OK; } if (strlen(param) >= CGI_PARAM_LEN_MAX) { /* * Too long. * * Note that the length limit is arbitrary, it just seems * sensible to limit it to *something*. There's no * technical reason for any limit at all. */ return JB_ERR_CGI_PARAMS; } /* Check every character to see if it's legal */ s = param; while ((ch = *s++) != '\0') { if (((unsigned char)ch < (unsigned char)' ') || (ch == '}')) { /* Probable hack attempt, or user accidentally used '}'. */ return JB_ERR_CGI_PARAMS; } } /* Success */ *pparam = param; return JB_ERR_OK; } /********************************************************************* * * Function : get_number_param * * Description : Get a non-negative integer from the parameters * passed to a CGI function. * * Parameters : * 1 : csp = Current client state (buffers, headers, etc...) * 2 : parameters = map of cgi parameters * 3 : name = Name of CGI parameter to read * 4 : pvalue = destination for value. * Set to -1 on error. * * Returns : JB_ERR_OK on success * JB_ERR_MEMORY on out-of-memory * JB_ERR_CGI_PARAMS if the parameter was not specified * or is not valid. * *********************************************************************/ jb_err get_number_param(struct client_state *csp, const struct map *parameters, char *name, unsigned *pvalue) { const char *param; char ch; unsigned value; assert(csp); assert(parameters); assert(name); assert(pvalue); *pvalue = 0; param = lookup(parameters, name); if (!*param) { return JB_ERR_CGI_PARAMS; } /* We don't use atoi because I want to check this carefully... */ value = 0; while ((ch = *param++) != '\0') { if ((ch < '0') || (ch > '9')) { return JB_ERR_CGI_PARAMS; } ch = (char)(ch - '0'); /* Note: * * defines UINT_MAX * * (UINT_MAX - ch) / 10 is the largest number that * can be safely multiplied by 10 then have ch added. */ if (value > ((UINT_MAX - (unsigned)ch) / 10U)) { return JB_ERR_CGI_PARAMS; } value = value * 10 + (unsigned)ch; } /* Success */ *pvalue = value; return JB_ERR_OK; } /********************************************************************* * * Function : error_response * * Description : returns an http_response that explains the reason * why a request failed. * * Parameters : * 1 : csp = Current client state (buffers, headers, etc...) * 2 : templatename = Which template should be used for the answer * * Returns : A http_response. If we run out of memory, this * will be cgi_error_memory(). * *********************************************************************/ struct http_response *error_response(struct client_state *csp, const char *templatename) { jb_err err; struct http_response *rsp; struct map *exports = default_exports(csp, NULL); char *path = NULL; if (exports == NULL) { return cgi_error_memory(); } if (NULL == (rsp = alloc_http_response())) { free_map(exports); return cgi_error_memory(); } #ifdef FEATURE_FORCE_LOAD if (csp->flags & CSP_FLAG_FORCED) { path = strdup(FORCE_PREFIX); } else #endif /* def FEATURE_FORCE_LOAD */ { path = strdup(""); } err = string_append(&path, csp->http->path); if (!err) err = map(exports, "host", 1, html_encode(csp->http->host), 0); if (!err) err = map(exports, "hostport", 1, html_encode(csp->http->hostport), 0); if (!err) err = map(exports, "path", 1, html_encode_and_free_original(path), 0); if (!err) err = map(exports, "protocol", 1, csp->http->ssl ? "https://" : "http://", 1); if (!err) { err = map(exports, "host-ip", 1, html_encode(csp->http->host_ip_addr_str), 0); if (err) { /* Some failures, like "404 no such domain", don't have an IP address. */ err = map(exports, "host-ip", 1, html_encode(csp->http->host), 0); } } if (err) { free_map(exports); free_http_response(rsp); return cgi_error_memory(); } if (!strcmp(templatename, "no-such-domain")) { rsp->status = strdup("404 No such domain"); rsp->crunch_reason = NO_SUCH_DOMAIN; } else if (!strcmp(templatename, "forwarding-failed")) { const struct forward_spec *fwd = forward_url(csp, csp->http); char *socks_type = NULL; if (fwd == NULL) { log_error(LOG_LEVEL_FATAL, "gateway spec is NULL. This shouldn't happen!"); /* Never get here - LOG_LEVEL_FATAL causes program exit */ } /* * XXX: While the template is called forwarding-failed, * it currently only handles socks forwarding failures. */ assert(fwd != NULL); assert(fwd->type != SOCKS_NONE); /* * Map failure reason, forwarding type and forwarder. */ if (NULL == csp->error_message) { /* * Either we forgot to record the failure reason, * or the memory allocation failed. */ log_error(LOG_LEVEL_ERROR, "Socks failure reason missing."); csp->error_message = strdup("Failure reason missing. Check the log file for details."); } if (!err) err = map(exports, "gateway", 1, fwd->gateway_host, 1); /* * XXX: this is almost the same code as in cgi_show_url_info() * and thus should be factored out and shared. */ switch (fwd->type) { case SOCKS_4: socks_type = "socks4-"; break; case SOCKS_4A: socks_type = "socks4a-"; break; case SOCKS_5: socks_type = "socks5-"; break; default: log_error(LOG_LEVEL_FATAL, "Unknown socks type: %d.", fwd->type); } if (!err) err = map(exports, "forwarding-type", 1, socks_type, 1); if (!err) err = map(exports, "error-message", 1, html_encode(csp->error_message), 0); if ((NULL == csp->error_message) || err) { free_map(exports); free_http_response(rsp); return cgi_error_memory(); } rsp->status = strdup("503 Forwarding failure"); rsp->crunch_reason = FORWARDING_FAILED; } else if (!strcmp(templatename, "connect-failed")) { rsp->status = strdup("503 Connect failed"); rsp->crunch_reason = CONNECT_FAILED; } else if (!strcmp(templatename, "connection-timeout")) { rsp->status = strdup("504 Connection timeout"); rsp->crunch_reason = CONNECTION_TIMEOUT; } else if (!strcmp(templatename, "no-server-data")) { rsp->status = strdup("502 No data received from server or forwarder"); rsp->crunch_reason = NO_SERVER_DATA; } if (rsp->status == NULL) { free_map(exports); free_http_response(rsp); return cgi_error_memory(); } err = template_fill_for_cgi(csp, templatename, exports, rsp); if (err) { free_http_response(rsp); return cgi_error_memory(); } return finish_http_response(csp, rsp); } /********************************************************************* * * Function : cgi_error_disabled * * Description : CGI function that is called to generate an error * response if the actions editor or toggle CGI are * accessed despite having being disabled at compile- * or run-time, or if the user followed an untrusted link * to access a unsafe CGI feature that is only reachable * through Privoxy directly. * * Parameters : * 1 : csp = Current client state (buffers, headers, etc...) * 2 : rsp = http_response data structure for output * * CGI Parameters : none * * Returns : JB_ERR_OK on success * JB_ERR_MEMORY on out-of-memory error. * *********************************************************************/ jb_err cgi_error_disabled(const struct client_state *csp, struct http_response *rsp) { struct map *exports; assert(csp); assert(rsp); if (NULL == (exports = default_exports(csp, "cgi-error-disabled"))) { return JB_ERR_MEMORY; } if (map(exports, "url", 1, html_encode(csp->http->url), 0)) { /* Not important enough to do anything */ log_error(LOG_LEVEL_ERROR, "Failed to fill in url."); } return template_fill_for_cgi(csp, "cgi-error-disabled", exports, rsp); } /********************************************************************* * * Function : cgi_init_error_messages * * Description : Call at the start of the program to initialize * the error message used by cgi_error_memory(). * * Parameters : N/A * * Returns : N/A * *********************************************************************/ void cgi_init_error_messages(void) { memset(cgi_error_memory_response, '\0', sizeof(*cgi_error_memory_response)); cgi_error_memory_response->head = "HTTP/1.0 500 Internal Privoxy Error\r\n" "Content-Type: text/html\r\n" "\r\n"; cgi_error_memory_response->body = "\n" "\n" " 500 Internal Privoxy Error\n" " " "\n" "\n" "

500 Internal Privoxy Error

\n" "

Privoxy ran out of memory while processing your request.

\n" "

Please contact your proxy administrator, or try again later

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

500 Internal Privoxy Error

\n" "

Privoxy encountered an error while processing your request:

\n" "

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

\n" "

Please contact your proxy administrator.

\n" "

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

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

500 Internal Privoxy Error

\n" "

Privoxy encountered an error while processing your request:

\n" "

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

\n" "

Please " "" "file a bug report.

\n" "\n" "\n"; /* Includes room for larger error numbers in the future. */ const size_t body_size = sizeof(body_prefix) + sizeof(body_suffix) + 5; assert(csp); assert(rsp); /* Reset rsp, if needed */ freez(rsp->status); freez(rsp->head); freez(rsp->body); rsp->content_length = 0; rsp->head_length = 0; rsp->is_static = 0; rsp->crunch_reason = INTERNAL_ERROR; rsp->body = malloc(body_size); if (rsp->body == NULL) { return JB_ERR_MEMORY; } snprintf(rsp->body, body_size, "%s%d%s", body_prefix, error_to_report, body_suffix); rsp->status = strdup(status); if (rsp->status == NULL) { return JB_ERR_MEMORY; } return JB_ERR_OK; } /********************************************************************* * * Function : cgi_error_bad_param * * Description : CGI function that is called if the parameters * (query string) for a CGI were wrong. * * Parameters : * 1 : csp = Current client state (buffers, headers, etc...) * 2 : rsp = http_response data structure for output * * CGI Parameters : none * * Returns : JB_ERR_OK on success * JB_ERR_MEMORY on out-of-memory error. * *********************************************************************/ jb_err cgi_error_bad_param(const struct client_state *csp, struct http_response *rsp) { struct map *exports; assert(csp); assert(rsp); if (NULL == (exports = default_exports(csp, NULL))) { return JB_ERR_MEMORY; } return template_fill_for_cgi(csp, "cgi-error-bad-param", exports, rsp); } /********************************************************************* * * Function : cgi_redirect * * Description : CGI support function to generate a HTTP redirect * message * * Parameters : * 1 : rsp = http_response data structure for output * 2 : target = string with the target URL * * CGI Parameters : None * * Returns : JB_ERR_OK on success * JB_ERR_MEMORY on out-of-memory error. * *********************************************************************/ jb_err cgi_redirect (struct http_response * rsp, const char *target) { jb_err err; assert(rsp); assert(target); err = enlist_unique_header(rsp->headers, "Location", target); rsp->status = strdup("302 Local Redirect from Privoxy"); if (rsp->status == NULL) { return JB_ERR_MEMORY; } return err; } /********************************************************************* * * Function : add_help_link * * Description : Produce a copy of the string given as item, * embedded in an HTML link to its corresponding * section (item name in uppercase) in the actions * chapter of the user manual, (whose URL is given in * the config and defaults to our web site). * * FIXME: I currently only work for actions, and would * like to be generalized for other topics. * * Parameters : * 1 : item = item (will NOT be free()d.) * It is assumed to be HTML-safe. * 2 : config = The current configuration. * * Returns : String with item embedded in link, or NULL on * out-of-memory * *********************************************************************/ char *add_help_link(const char *item, struct configuration_spec *config) { char *result; if (!item) return NULL; result = strdup("usermanual, "file://", 7) || !strncmpic(config->usermanual, "http", 4)) { string_append(&result, config->usermanual); } else { string_append(&result, "http://"); string_append(&result, CGI_SITE_2_HOST); string_append(&result, "/user-manual/"); } string_append(&result, ACTIONS_HELP_PREFIX); string_join (&result, string_toupper(item)); string_append(&result, "\">"); string_append(&result, item); string_append(&result, ""); return result; } /********************************************************************* * * Function : get_http_time * * Description : Get the time in a format suitable for use in a * HTTP header - e.g.: * "Sun, 06 Nov 1994 08:49:37 GMT" * * Parameters : * 1 : time_offset = Time returned will be current time * plus this number of seconds. * 2 : buf = Destination for result. * 3 : buffer_size = Size of the buffer above. Must be big * enough to hold 29 characters plus a * trailing zero. * * Returns : N/A * *********************************************************************/ void get_http_time(int time_offset, char *buf, size_t buffer_size) { struct tm *t; time_t current_time; #if defined(HAVE_GMTIME_R) struct tm dummy; #endif assert(buf); assert(buffer_size > (size_t)29); time(¤t_time); current_time += time_offset; /* get and save the gmt */ #if HAVE_GMTIME_R t = gmtime_r(¤t_time, &dummy); #elif defined(MUTEX_LOCKS_AVAILABLE) privoxy_mutex_lock(&gmtime_mutex); t = gmtime(¤t_time); privoxy_mutex_unlock(&gmtime_mutex); #else t = gmtime(¤t_time); #endif strftime(buf, buffer_size, "%a, %d %b %Y %H:%M:%S GMT", t); } /********************************************************************* * * Function : get_locale_time * * Description : Get the time in a date(1)-like format * according to the current locale - e.g.: * "Fri Aug 29 19:37:12 CEST 2008" * * XXX: Should we allow the user to change the format? * * Parameters : * 1 : buf = Destination for result. * 2 : buffer_size = Size of the buffer above. Must be big * enough to hold 29 characters plus a * trailing zero. * * Returns : N/A * *********************************************************************/ static void get_locale_time(char *buf, size_t buffer_size) { struct tm *timeptr; time_t current_time; #if defined(HAVE_LOCALTIME_R) struct tm dummy; #endif assert(buf); assert(buffer_size > (size_t)29); time(¤t_time); #if HAVE_LOCALTIME_R timeptr = localtime_r(¤t_time, &dummy); #elif defined(MUTEX_LOCKS_AVAILABLE) privoxy_mutex_lock(&localtime_mutex); timeptr = localtime(¤t_time); privoxy_mutex_unlock(&localtime_mutex); #else timeptr = localtime(¤t_time); #endif strftime(buf, buffer_size, "%a %b %d %X %Z %Y", timeptr); } #ifdef FEATURE_COMPRESSION /********************************************************************* * * Function : compress_buffer * * Description : Compresses the content of a buffer with zlib's deflate * Allocates a new buffer for the result, free'ing it is * up to the caller. * * Parameters : * 1 : buffer = buffer whose content should be compressed * 2 : buffer_length = length of the buffer * 3 : compression_level = compression level for compress2() * * Returns : NULL on error, otherwise a pointer to the compressed * content of the input buffer. * *********************************************************************/ char *compress_buffer(char *buffer, size_t *buffer_length, int compression_level) { char *compressed_buffer; uLongf new_length; assert(-1 <= compression_level && compression_level <= 9); /* Let zlib figure out the maximum length of the compressed data */ new_length = compressBound((uLongf)*buffer_length); compressed_buffer = malloc(new_length); if (NULL == compressed_buffer) { log_error(LOG_LEVEL_FATAL, "Out of memory allocation compression buffer."); } if (Z_OK != compress2((Bytef *)compressed_buffer, &new_length, (Bytef *)buffer, *buffer_length, compression_level)) { log_error(LOG_LEVEL_ERROR, "compress2() failed. Buffer size: %d, compression level: %d.", new_length, compression_level); freez(compressed_buffer); return NULL; } log_error(LOG_LEVEL_RE_FILTER, "Compressed content from %d to %d bytes. Compression level: %d", *buffer_length, new_length, compression_level); *buffer_length = (size_t)new_length; return compressed_buffer; } #endif /********************************************************************* * * Function : finish_http_response * * Description : Fill in the missing headers in an http response, * and flatten the headers to an http head. * For HEAD requests the body is freed once * the Content-Length header is set. * * Parameters : * 1 : rsp = pointer to http_response to be processed * * Returns : A http_response, usually the rsp parameter. * On error, free()s rsp and returns cgi_error_memory() * *********************************************************************/ struct http_response *finish_http_response(const struct client_state *csp, struct http_response *rsp) { char buf[BUFFER_SIZE]; jb_err err; /* Special case - do NOT change this statically allocated response, * which is ready for output anyway. */ if (rsp == cgi_error_memory_response) { return rsp; } /* * Fill in the HTTP Status, using HTTP/1.1 * unless the client asked for HTTP/1.0. */ snprintf(buf, sizeof(buf), "%s %s", strcmpic(csp->http->ver, "HTTP/1.0") ? "HTTP/1.1" : "HTTP/1.0", rsp->status ? rsp->status : "200 OK"); err = enlist_first(rsp->headers, buf); /* * Set the Content-Length */ if (rsp->content_length == 0) { rsp->content_length = rsp->body ? strlen(rsp->body) : 0; } #ifdef FEATURE_COMPRESSION if (!err && (csp->flags & CSP_FLAG_CLIENT_SUPPORTS_DEFLATE) && (rsp->content_length > LOWER_LENGTH_LIMIT_FOR_COMPRESSION)) { char *compressed_content; compressed_content = compress_buffer(rsp->body, &rsp->content_length, csp->config->compression_level); if (NULL != compressed_content) { freez(rsp->body); rsp->body = compressed_content; err = enlist_unique_header(rsp->headers, "Content-Encoding", "deflate"); } } #endif if (!err) { snprintf(buf, sizeof(buf), "Content-Length: %d", (int)rsp->content_length); err = enlist(rsp->headers, buf); } if (0 == strcmpic(csp->http->gpc, "head")) { /* * The client only asked for the head. Dispose * the body and log an offensive message. * * While it may seem to be a bit inefficient to * prepare the body if it isn't needed, it's the * only way to get the Content-Length right for * dynamic pages. We could have disposed the body * earlier, but not without duplicating the * Content-Length setting code above. */ log_error(LOG_LEVEL_CGI, "Preparing to give head to %s.", csp->ip_addr_str); freez(rsp->body); rsp->content_length = 0; } if (strncmpic(rsp->status, "302", 3)) { /* * If it's not a redirect without any content, * set the Content-Type to text/html if it's * not already specified. */ if (!err) err = enlist_unique(rsp->headers, "Content-Type: text/html", 13); } /* * Fill in the rest of the default headers: * * Date: set to current date/time. * Last-Modified: set to date/time the page was last changed. * Expires: set to date/time page next needs reloading. * Cache-Control: set to "no-cache" if applicable. * * See http://www.w3.org/Protocols/rfc2068/rfc2068 */ if (rsp->is_static) { /* * Set Expires to about 10 min into the future so it'll get reloaded * occasionally, e.g. if Privoxy gets upgraded. */ if (!err) { get_http_time(0, buf, sizeof(buf)); err = enlist_unique_header(rsp->headers, "Date", buf); } /* Some date in the past. */ if (!err) err = enlist_unique_header(rsp->headers, "Last-Modified", "Sat, 17 Jun 2000 12:00:00 GMT"); if (!err) { get_http_time(10 * 60, buf, sizeof(buf)); /* 10 * 60sec = 10 minutes */ err = enlist_unique_header(rsp->headers, "Expires", buf); } } else if (!strncmpic(rsp->status, "302", 3)) { get_http_time(0, buf, sizeof(buf)); if (!err) err = enlist_unique_header(rsp->headers, "Date", buf); } else { /* * Setting "Cache-Control" to "no-cache" and "Expires" to * the current time doesn't exactly forbid caching, it just * requires the client to revalidate the cached copy. * * If a temporary problem occurs and the user tries again after * getting Privoxy's error message, a compliant browser may set the * If-Modified-Since header with the content of the error page's * Last-Modified header. More often than not, the document on the server * is older than Privoxy's error message, the server would send status code * 304 and the browser would display the outdated error message again and again. * * For documents delivered with status code 403, 404 and 503 we set "Last-Modified" * to Tim Berners-Lee's birthday, which predates the age of any page on the web * and can be safely used to "revalidate" without getting a status code 304. * * There is no need to let the useless If-Modified-Since header reach the * server, it is therefore stripped by client_if_modified_since in parsers.c. */ if (!err) err = enlist_unique_header(rsp->headers, "Cache-Control", "no-cache"); get_http_time(0, buf, sizeof(buf)); if (!err) err = enlist_unique_header(rsp->headers, "Date", buf); if (!strncmpic(rsp->status, "403", 3) || !strncmpic(rsp->status, "404", 3) || !strncmpic(rsp->status, "502", 3) || !strncmpic(rsp->status, "503", 3) || !strncmpic(rsp->status, "504", 3)) { if (!err) err = enlist_unique_header(rsp->headers, "Last-Modified", "Wed, 08 Jun 1955 12:00:00 GMT"); } else { if (!err) err = enlist_unique_header(rsp->headers, "Last-Modified", buf); } if (!err) err = enlist_unique_header(rsp->headers, "Expires", "Sat, 17 Jun 2000 12:00:00 GMT"); if (!err) err = enlist_unique_header(rsp->headers, "Pragma", "no-cache"); } if (!err && !(csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE)) { err = enlist_unique_header(rsp->headers, "Connection", "close"); } /* * Write the head */ if (err || (NULL == (rsp->head = list_to_text(rsp->headers)))) { free_http_response(rsp); return cgi_error_memory(); } rsp->head_length = strlen(rsp->head); return rsp; } /********************************************************************* * * Function : alloc_http_response * * Description : Allocates a new http_response structure. * * Parameters : N/A * * Returns : pointer to a new http_response, or NULL. * *********************************************************************/ struct http_response *alloc_http_response(void) { return (struct http_response *) zalloc(sizeof(struct http_response)); } /********************************************************************* * * Function : free_http_response * * Description : Free the memory occupied by an http_response * and its depandant structures. * * Parameters : * 1 : rsp = pointer to http_response to be freed * * Returns : N/A * *********************************************************************/ void free_http_response(struct http_response *rsp) { /* * Must special case cgi_error_memory_response, which is never freed. */ if (rsp && (rsp != cgi_error_memory_response)) { freez(rsp->status); freez(rsp->head); freez(rsp->body); destroy_list(rsp->headers); free(rsp); } } /********************************************************************* * * Function : template_load * * Description : CGI support function that loads a given HTML * template, ignoring comment lines and following * #include statements up to a depth of 1. * * Parameters : * 1 : csp = Current client state (buffers, headers, etc...) * 2 : template_ptr = Destination for pointer to loaded * template text. * 3 : templatename = name of the HTML template to be used * 4 : recursive = Flag set if this function calls itself * following an #include statament * * Returns : JB_ERR_OK on success * JB_ERR_MEMORY on out-of-memory error. * JB_ERR_FILE if the template file cannot be read * *********************************************************************/ jb_err template_load(const struct client_state *csp, char **template_ptr, const char *templatename, int recursive) { jb_err err; char *templates_dir_path; char *full_path; char *file_buffer; char *included_module; const char *p; FILE *fp; char buf[BUFFER_SIZE]; assert(csp); assert(template_ptr); assert(templatename); *template_ptr = NULL; /* Validate template name. Paranoia. */ for (p = templatename; *p != 0; p++) { if ( ((*p < 'a') || (*p > 'z')) && ((*p < 'A') || (*p > 'Z')) && ((*p < '0') || (*p > '9')) && (*p != '-') && (*p != '.')) { /* Illegal character */ return JB_ERR_FILE; } } /* * Generate full path using either templdir * or confdir/templates as base directory. */ if (NULL != csp->config->templdir) { templates_dir_path = strdup(csp->config->templdir); } else { templates_dir_path = make_path(csp->config->confdir, "templates"); } if (templates_dir_path == NULL) { log_error(LOG_LEVEL_ERROR, "Out of memory while generating template path for %s.", templatename); return JB_ERR_MEMORY; } full_path = make_path(templates_dir_path, templatename); free(templates_dir_path); if (full_path == NULL) { log_error(LOG_LEVEL_ERROR, "Out of memory while generating full template path for %s.", templatename); return JB_ERR_MEMORY; } /* Allocate buffer */ file_buffer = strdup(""); if (file_buffer == NULL) { log_error(LOG_LEVEL_ERROR, "Not enough free memory to buffer %s.", full_path); free(full_path); return JB_ERR_MEMORY; } /* Open template file */ if (NULL == (fp = fopen(full_path, "r"))) { log_error(LOG_LEVEL_ERROR, "Cannot open template file %s: %E", full_path); free(full_path); free(file_buffer); return JB_ERR_FILE; } free(full_path); /* * Read the file, ignoring comments, and honoring #include * statements, unless we're already called recursively. * * XXX: The comment handling could break with lines lengths > sizeof(buf). * This is unlikely in practise. */ while (fgets(buf, sizeof(buf), fp)) { if (!recursive && !strncmp(buf, "#include ", 9)) { if (JB_ERR_OK != (err = template_load(csp, &included_module, chomp(buf + 9), 1))) { free(file_buffer); fclose(fp); return err; } if (string_join(&file_buffer, included_module)) { fclose(fp); return JB_ERR_MEMORY; } continue; } /* skip lines starting with '#' */ if (*buf == '#') { continue; } if (string_append(&file_buffer, buf)) { fclose(fp); return JB_ERR_MEMORY; } } fclose(fp); *template_ptr = file_buffer; return JB_ERR_OK; } /********************************************************************* * * Function : template_fill * * Description : CGI support function that fills in a pre-loaded * HTML template by replacing @name@ with value using * pcrs, for each item in the output map. * * Note that a leading '$' character in the export map's * values will be stripped and toggle on backreference * interpretation. * * Parameters : * 1 : template_ptr = IN: Template to be filled out. * Will be free()d. * OUT: Filled out template. * Caller must free(). * 2 : exports = map with fill in symbol -> name pairs * * Returns : JB_ERR_OK on success (and for uncritical errors) * JB_ERR_MEMORY on out-of-memory error * *********************************************************************/ jb_err template_fill(char **template_ptr, const struct map *exports) { struct map_entry *m; pcrs_job *job; char buf[BUFFER_SIZE]; char *tmp_out_buffer; char *file_buffer; size_t size; int error; const char *flags; assert(template_ptr); assert(*template_ptr); assert(exports); file_buffer = *template_ptr; size = strlen(file_buffer) + 1; /* * Assemble pcrs joblist from exports map */ for (m = exports->first; m != NULL; m = m->next) { if (*m->name == '$') { /* * First character of name is '$', so remove this flag * character and allow backreferences ($1 etc) in the * "replace with" text. */ snprintf(buf, sizeof(buf), "%s", m->name + 1); flags = "sigU"; } else { /* * Treat the "replace with" text as a literal string - * no quoting needed, no backreferences allowed. * ("Trivial" ['T'] flag). */ flags = "sigTU"; /* Enclose name in @@ */ snprintf(buf, sizeof(buf), "@%s@", m->name); } log_error(LOG_LEVEL_CGI, "Substituting: s/%s/%s/%s", buf, m->value, flags); /* Make and run job. */ job = pcrs_compile(buf, m->value, flags, &error); if (job == NULL) { if (error == PCRS_ERR_NOMEM) { free(file_buffer); *template_ptr = NULL; return JB_ERR_MEMORY; } else { log_error(LOG_LEVEL_ERROR, "Error compiling template fill job %s: %d", m->name, error); /* Hope it wasn't important and silently ignore the invalid job */ } } else { error = pcrs_execute(job, file_buffer, size, &tmp_out_buffer, &size); pcrs_free_job(job); if (NULL == tmp_out_buffer) { *template_ptr = NULL; return JB_ERR_MEMORY; } if (error < 0) { /* * Substitution failed, keep the original buffer, * log the problem and ignore it. * * The user might see some unresolved @CGI_VARIABLES@, * but returning a special CGI error page seems unreasonable * and could mask more important error messages. */ free(tmp_out_buffer); log_error(LOG_LEVEL_ERROR, "Failed to execute s/%s/%s/%s. %s", buf, m->value, flags, pcrs_strerror(error)); } else { /* Substitution succeeded, use modified buffer. */ free(file_buffer); file_buffer = tmp_out_buffer; } } } /* * Return */ *template_ptr = file_buffer; return JB_ERR_OK; } /********************************************************************* * * Function : template_fill_for_cgi * * Description : CGI support function that loads a HTML template * and fills it in. Handles file-not-found errors * by sending a HTML error message. For convenience, * this function also frees the passed "exports" map. * * Parameters : * 1 : csp = Client state * 2 : templatename = name of the HTML template to be used * 3 : exports = map with fill in symbol -> name pairs. * Will be freed by this function. * 4 : rsp = Response structure to fill in. * * Returns : JB_ERR_OK on success * JB_ERR_MEMORY on out-of-memory error * *********************************************************************/ jb_err template_fill_for_cgi(const struct client_state *csp, const char *templatename, struct map *exports, struct http_response *rsp) { jb_err err; assert(csp); assert(templatename); assert(exports); assert(rsp); err = template_load(csp, &rsp->body, templatename, 0); if (err == JB_ERR_FILE) { free_map(exports); return cgi_error_no_template(csp, rsp, templatename); } else if (err) { free_map(exports); return err; /* JB_ERR_MEMORY */ } err = template_fill(&rsp->body, exports); free_map(exports); return err; } /********************************************************************* * * Function : default_exports * * Description : returns a struct map list that contains exports * which are common to all CGI functions. * * Parameters : * 1 : csp = Current client state (buffers, headers, etc...) * 2 : caller = name of CGI who calls us and which should * be excluded from the generated menu. May be * NULL. * Returns : NULL if no memory, else a new map. Caller frees. * *********************************************************************/ struct map *default_exports(const struct client_state *csp, const char *caller) { char buf[30]; jb_err err; struct map * exports; int local_help_exists = 0; char *ip_address = NULL; char *port = NULL; char *hostname = NULL; assert(csp); exports = new_map(); if (exports == NULL) { return NULL; } if (csp->config->hostname) { get_host_information(csp->cfd, &ip_address, &port, NULL); hostname = strdup(csp->config->hostname); } else { get_host_information(csp->cfd, &ip_address, &port, &hostname); } err = map(exports, "version", 1, html_encode(VERSION), 0); get_locale_time(buf, sizeof(buf)); if (!err) err = map(exports, "time", 1, html_encode(buf), 0); if (!err) err = map(exports, "my-ip-address", 1, html_encode(ip_address ? ip_address : "unknown"), 0); freez(ip_address); if (!err) err = map(exports, "my-port", 1, html_encode(port ? port : "unknown"), 0); freez(port); if (!err) err = map(exports, "my-hostname", 1, html_encode(hostname ? hostname : "unknown"), 0); freez(hostname); if (!err) err = map(exports, "homepage", 1, html_encode(HOME_PAGE_URL), 0); if (!err) err = map(exports, "default-cgi", 1, html_encode(CGI_PREFIX), 0); if (!err) err = map(exports, "menu", 1, make_menu(caller, csp->config->feature_flags), 0); if (!err) err = map(exports, "code-status", 1, CODE_STATUS, 1); if (!strncmpic(csp->config->usermanual, "file://", 7) || !strncmpic(csp->config->usermanual, "http", 4)) { /* Manual is located somewhere else, just link to it. */ if (!err) err = map(exports, "user-manual", 1, html_encode(csp->config->usermanual), 0); } else { /* Manual is delivered by Privoxy. */ if (!err) err = map(exports, "user-manual", 1, html_encode(CGI_PREFIX"user-manual/"), 0); } if (!err) err = map(exports, "actions-help-prefix", 1, ACTIONS_HELP_PREFIX ,1); #ifdef FEATURE_TOGGLE if (!err) err = map_conditional(exports, "enabled-display", global_toggle_state); #else if (!err) err = map_block_killer(exports, "can-toggle"); #endif if (!strcmp(CODE_STATUS, "stable")) { if (!err) err = map_block_killer(exports, "unstable"); } if (csp->config->admin_address != NULL) { if (!err) err = map(exports, "admin-address", 1, html_encode(csp->config->admin_address), 0); local_help_exists = 1; } else { if (!err) err = map_block_killer(exports, "have-adminaddr-info"); } if (csp->config->proxy_info_url != NULL) { if (!err) err = map(exports, "proxy-info-url", 1, html_encode(csp->config->proxy_info_url), 0); local_help_exists = 1; } else { if (!err) err = map_block_killer(exports, "have-proxy-info"); } if (local_help_exists == 0) { if (!err) err = map_block_killer(exports, "have-help-info"); } if (err) { free_map(exports); return NULL; } return exports; } /********************************************************************* * * Function : map_block_killer * * Description : Convenience function. * Adds a "killer" for the conditional HTML-template * block , i.e. a substitution of the regex * "if--start.*if--end" to the given * export list. * * Parameters : * 1 : exports = map to extend * 2 : name = name of conditional block * * Returns : JB_ERR_OK on success * JB_ERR_MEMORY on out-of-memory error. * *********************************************************************/ jb_err map_block_killer(struct map *exports, const char *name) { char buf[1000]; /* Will do, since the names are hardwired */ assert(exports); assert(name); assert(strlen(name) < (size_t)490); snprintf(buf, sizeof(buf), "if-%s-start.*if-%s-end", name, name); return map(exports, buf, 1, "", 1); } /********************************************************************* * * Function : map_block_keep * * Description : Convenience function. Removes the markers used * by map-block-killer, to save a few bytes. * i.e. removes "@if--start@" and "@if--end@" * * Parameters : * 1 : exports = map to extend * 2 : name = name of conditional block * * Returns : JB_ERR_OK on success * JB_ERR_MEMORY on out-of-memory error. * *********************************************************************/ jb_err map_block_keep(struct map *exports, const char *name) { jb_err err; char buf[500]; /* Will do, since the names are hardwired */ assert(exports); assert(name); assert(strlen(name) < (size_t)490); snprintf(buf, sizeof(buf), "if-%s-start", name); err = map(exports, buf, 1, "", 1); if (err) { return err; } snprintf(buf, sizeof(buf), "if-%s-end", name); return map(exports, buf, 1, "", 1); } /********************************************************************* * * Function : map_conditional * * Description : Convenience function. * Adds an "if-then-else" for the conditional HTML-template * block , i.e. a substitution of the form: * @if--then@ * True text * @else-not-@ * False text * @endif-@ * * The control structure and one of the alternatives * will be hidden. * * Parameters : * 1 : exports = map to extend * 2 : name = name of conditional block * 3 : choose_first = nonzero for first, zero for second. * * Returns : JB_ERR_OK on success * JB_ERR_MEMORY on out-of-memory error. * *********************************************************************/ jb_err map_conditional(struct map *exports, const char *name, int choose_first) { char buf[1000]; /* Will do, since the names are hardwired */ jb_err err; assert(exports); assert(name); assert(strlen(name) < (size_t)480); snprintf(buf, sizeof(buf), (choose_first ? "else-not-%s@.*@endif-%s" : "if-%s-then@.*@else-not-%s"), name, name); err = map(exports, buf, 1, "", 1); if (err) { return err; } snprintf(buf, sizeof(buf), (choose_first ? "if-%s-then" : "endif-%s"), name); return map(exports, buf, 1, "", 1); } /********************************************************************* * * Function : make_menu * * Description : Returns an HTML-formatted menu of the available * unhidden CGIs, excluding the one given in * and the toggle CGI if toggling is disabled. * * Parameters : * 1 : self = name of CGI to leave out, can be NULL for * complete listing. * 2 : feature_flags = feature bitmap from csp->config * * * Returns : menu string, or NULL on out-of-memory error. * *********************************************************************/ char *make_menu(const char *self, const unsigned feature_flags) { const struct cgi_dispatcher *d; char *result = strdup(""); if (self == NULL) { self = "NO-SUCH-CGI!"; } /* List available unhidden CGI's and export as "other-cgis" */ for (d = cgi_dispatchers; d->name; d++) { #ifdef FEATURE_TOGGLE if (!(feature_flags & RUNTIME_FEATURE_CGI_TOGGLE) && !strcmp(d->name, "toggle")) { /* * Suppress the toggle link if remote toggling is disabled. */ continue; } #endif /* def FEATURE_TOGGLE */ if (d->description && strcmp(d->name, self)) { char *html_encoded_prefix; /* * Line breaks would be great, but break * the "blocked" template's JavaScript. */ string_append(&result, "
  • name); string_append(&result, "\">"); string_append(&result, d->description); string_append(&result, "
  • "); } } return result; } /********************************************************************* * * Function : dump_map * * Description : HTML-dump a map for debugging (as table) * * Parameters : * 1 : the_map = map to dump * * Returns : string with HTML * *********************************************************************/ char *dump_map(const struct map *the_map) { struct map_entry *cur_entry; char *ret = strdup(""); string_append(&ret, "\n"); for (cur_entry = the_map->first; (cur_entry != NULL) && (ret != NULL); cur_entry = cur_entry->next) { string_append(&ret, "\n"); } string_append(&ret, "
    "); string_join (&ret, html_encode(cur_entry->name)); string_append(&ret, ""); string_join (&ret, html_encode(cur_entry->value)); string_append(&ret, "
    \n"); return ret; } /* Local Variables: tab-width: 3 end: */