-const char filters_rcs[] = "$Id: filters.c,v 1.17 2001/06/09 10:55:28 jongfoster Exp $";
+const char filters_rcs[] = "$Id: filters.c,v 1.38 2001/10/23 21:32:33 jongfoster Exp $";
/*********************************************************************
*
* File : $Source: /cvsroot/ijbswa/current/filters.c,v $
* `acl_addr', `add_stats', `block_acl', `block_imageurl',
* `block_url', `url_actions', `domaincmp', `dsplit',
* `filter_popups', `forward_url', 'redirect_url',
- * `ij_untrusted_url', `intercept_url', `re_process_buffer',
+ * `ij_untrusted_url', `intercept_url', `pcrs_filter_respose',
* `show_proxy_args', 'ijb_send_banner', and `trust_url'
*
* Copyright : Written by and Copyright (C) 2001 the SourceForge
* IJBSWA team. http://ijbswa.sourceforge.net
*
* Based on the Internet Junkbuster originally written
- * by and Copyright (C) 1997 Anonymous Coders and
+ * by and Copyright (C) 1997 Anonymous Coders and
* Junkbusters Corporation. http://www.junkbusters.com
*
- * This program is free software; you can redistribute it
+ * 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
*
* Revisions :
* $Log: filters.c,v $
+ * Revision 1.38 2001/10/23 21:32:33 jongfoster
+ * Adding error-checking to selected functions
+ *
+ * Revision 1.37 2001/10/22 15:33:56 david__schmidt
+ * Special-cased OS/2 out of the Netscape-abort-on-404-in-js problem in
+ * filters.c. Added a FIXME in front of the offending code. I'll gladly
+ * put in a better/more robust fix for all parties if one is presented...
+ * It seems that just returning 200 instead of 404 would pretty much fix
+ * it for everyone, but I don't know all the history of the problem.
+ *
+ * Revision 1.36 2001/10/10 16:44:16 oes
+ * Added match_portlist function
+ *
+ * Revision 1.35 2001/10/07 15:41:23 oes
+ * Replaced 6 boolean members of csp with one bitmap (csp->flags)
+ *
+ * New function remove_chunked_transfer_coding that strips chunked
+ * transfer coding to plain and is called by pcrs_filter_response
+ * and gif_deanimate_response if neccessary
+ *
+ * Improved handling of zero-change re_filter runs
+ *
+ * pcrs_filter_response and gif_deanimate_response now remove
+ * chunked transfer codeing before processing the body.
+ *
+ * Revision 1.34 2001/09/20 15:49:36 steudten
+ *
+ * Fix BUG: Change int size to size_t size in pcrs_filter_response().
+ * See cgi.c fill_template().
+ *
+ * Revision 1.33 2001/09/16 17:05:14 jongfoster
+ * Removing unused #include showarg.h
+ *
+ * Revision 1.32 2001/09/16 13:21:27 jongfoster
+ * Changes to use new list functions.
+ *
+ * Revision 1.31 2001/09/16 11:38:02 jongfoster
+ * Splitting fill_template() into 2 functions:
+ * template_load() loads the file
+ * template_fill() performs the PCRS regexps.
+ * This is because the CGI edit interface has a "table row"
+ * template which is used many times in the page - this
+ * change means it's only loaded from disk once.
+ *
+ * Revision 1.30 2001/09/16 11:00:10 jongfoster
+ * New function alloc_http_response, for symmetry with free_http_response
+ *
+ * Revision 1.29 2001/09/13 23:32:40 jongfoster
+ * Moving image data to cgi.c rather than cgi.h
+ * Fixing a GPF under Win32 (and any other OS that protects global
+ * constants from being written to).
+ *
+ * Revision 1.28 2001/09/10 10:18:51 oes
+ * Silenced compiler warnings
+ *
+ * Revision 1.27 2001/08/05 16:06:20 jongfoster
+ * Modifiying "struct map" so that there are now separate header and
+ * "map_entry" structures. This means that functions which modify a
+ * map no longer need to return a pointer to the modified map.
+ * Also, it no longer reverses the order of the entries (which may be
+ * important with some advanced template substitutions).
+ *
+ * Revision 1.26 2001/07/30 22:08:36 jongfoster
+ * Tidying up #defines:
+ * - All feature #defines are now of the form FEATURE_xxx
+ * - Permanently turned off WIN_GUI_EDIT
+ * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
+ *
+ * Revision 1.25 2001/07/26 10:09:46 oes
+ * Made browser detection a little less naive
+ *
+ * Revision 1.24 2001/07/25 17:22:51 oes
+ * Added workaround for Netscape bug that prevents display of page when loading a component fails.
+ *
+ * Revision 1.23 2001/07/23 13:40:12 oes
+ * Fixed bug that caused document body to be dropped when pcrs joblist was empty.
+ *
+ * Revision 1.22 2001/07/18 12:29:34 oes
+ * - Made gif_deanimate_response respect
+ * csp->action->string[ACTION_STRING_DEANIMATE]
+ * - Logging cosmetics
+ *
+ * Revision 1.21 2001/07/13 13:59:53 oes
+ * - Introduced gif_deanimate_response which shares the
+ * generic content modification interface of pcrs_filter_response
+ * and acts as a wrapper to deanimate.c:gif_deanimate()
+ * - Renamed re_process_buffer to pcrs_filter_response
+ * - pcrs_filter_response now returns NULL on failiure
+ * - Removed all #ifdef PCRS
+ *
+ * Revision 1.20 2001/07/01 17:01:04 oes
+ * Added comments and missing return statement in is_untrusted_url()
+ *
+ * Revision 1.19 2001/06/29 21:45:41 oes
+ * Indentation, CRLF->LF, Tab-> Space
+ *
+ * Revision 1.18 2001/06/29 13:27:38 oes
+ * - Cleaned up, renamed and reorderd functions
+ * and improved comments
+ *
+ * - block_url:
+ * - Ported to CGI platform. Now delivers
+ * http_response or NULL
+ * - Unified HTML and GIF generation (moved image detection
+ * and GIF generation here from jcc.c:chat())
+ * - Fixed HTTP status to:
+ * - 403 (Forbidden) for the "blocked" HTML message
+ * - 200 (OK) for GIF answers
+ * - 302 (Redirect) for redirect to GIF
+ *
+ * - trust_url:
+ * - Ported to CGI platform. Now delivers
+ * http_response or NULL
+ * - Separated detection of untrusted URL into
+ * (bool)is_untrusted_url
+ * - Added enforcement of untrusted requests
+ *
+ * - Moved redirect_url() from cgi.c to here
+ * and ported it to the CGI platform
+ *
+ * - Removed logentry from cancelled commit
+ *
* Revision 1.17 2001/06/09 10:55:28 jongfoster
* Changing BUFSIZ ==> BUFFER_SIZE
*
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
+#include <assert.h>
#ifndef _WIN32
+#ifndef __OS2__
#include <unistd.h>
+#endif /* ndef __OS2__ */
#include <netinet/in.h>
#else
#include <winsock2.h>
-#endif
+#endif /* ndef _WIN32 */
+
+#ifdef __OS2__
+#include <utils.h>
+#endif /* def __OS2__ */
#include "project.h"
#include "filters.h"
#include "encode.h"
-#include "jcc.h"
-#include "showargs.h"
#include "parsers.h"
#include "ssplit.h"
-#include "gateway.h"
-#include "jbsockets.h"
#include "errlog.h"
#include "jbsockets.h"
#include "miscutil.h"
#include "actions.h"
#include "cgi.h"
#include "list.h"
+#include "deanimate.h"
#ifdef _WIN32
#include "win32.h"
#define ijb_isdigit(__X) isdigit((int)(unsigned char)(__X))
-#ifdef ACL_FILES
+#ifdef FEATURE_ACL
/*********************************************************************
*
* Function : block_acl
* Returns : 0 = FALSE (don't block) and 1 = TRUE (do block)
*
*********************************************************************/
-int block_acl(struct access_control_addr *dst,
- struct client_state *csp)
+int block_acl(struct access_control_addr *dst, struct client_state *csp)
{
struct access_control_list *acl = csp->config->acl;
return(0);
}
-#endif /* def ACL_FILES */
+#endif /* def FEATURE_ACL */
+
+
+/*********************************************************************
+ *
+ * Function : match_portlist
+ *
+ * Description : Check if a given number is covered by a comma
+ * separated list of numbers and ranges (a,b-c,d,..)
+ *
+ * Parameters :
+ * 1 : portlist = String with list
+ * 2 : port = port to check
+ *
+ * Returns : 0 => no match
+ * 1 => match
+ *
+ *********************************************************************/
+int match_portlist(const char *portlist, int port)
+{
+ char *min, *max, *next, *portlist_copy;
+
+ min = next = portlist_copy = strdup(portlist);
+
+ /*
+ * Zero-terminate first item and remember offset for next
+ */
+ if (NULL != (next = strchr(portlist_copy, (int) ',')))
+ {
+ *next++ = '\0';
+ }
+
+ /*
+ * Loop through all items, checking for match
+ */
+ while(min)
+ {
+ if (NULL == (max = strchr(min, (int) '-')))
+ {
+ /*
+ * No dash, check for equality
+ */
+ if (port == atoi(min))
+ {
+ free(portlist_copy);
+ return(1);
+ }
+ }
+ else
+ {
+ /*
+ * This is a range, so check if between min and max,
+ * or, if max was omitted, between min and 65K
+ */
+ *max++ = '\0';
+ if(port >= atoi(min) && port <= (atoi(max) ? atoi(max) : 65535))
+ {
+ free(portlist_copy);
+ return(1);
+ }
+
+ }
+
+ /*
+ * Jump to next item
+ */
+ min = next;
+
+ /*
+ * Zero-terminate next item and remember offset for n+1
+ */
+ if ((NULL != next) && (NULL != (next = strchr(next, (int) ','))))
+ {
+ *next++ = '\0';
+ }
+ }
+
+ free(portlist_copy);
+ return 0;
+
+}
/*********************************************************************
*********************************************************************/
struct http_response *block_url(struct client_state *csp)
{
+#ifdef FEATURE_IMAGE_BLOCKING
char *p;
- struct http_response *rsp;
- struct map *exports = NULL;
+#endif /* def FEATURE_IMAGE_BLOCKING */
+ struct http_response *rsp;
- /*
+ /*
* If it's not blocked, don't block it ;-)
*/
if ((csp->action->flags & ACTION_BLOCK) == 0)
{
- return(NULL);
+ return NULL;
}
- /*
+ /*
* Else, prepare a response
*/
- if (NULL == ( rsp = (struct http_response *)zalloc(sizeof(*rsp))))
+ if (NULL == (rsp = alloc_http_response()))
{
- return NULL;
+ return cgi_error_memory();
}
/*
* If it's an image-url, send back an image or redirect
* as specified by the relevant +image action
*/
-#ifdef IMAGE_BLOCKING
- if (((csp->action->flags & ACTION_IMAGE_BLOCKER) != 0)
+#ifdef FEATURE_IMAGE_BLOCKING
+ if (((csp->action->flags & ACTION_IMAGE_BLOCKER) != 0)
&& is_imageurl(csp))
- {
- /* determine HOW images should be blocked */
+ {
+ /* determine HOW images should be blocked */
p = csp->action->string[ACTION_STRING_IMAGE_BLOCKER];
/* and handle accordingly: */
if ((p == NULL) || (0 == strcmpic(p, "logo")))
{
- rsp->body = bindup(JBGIF, sizeof(JBGIF));
- rsp->content_length = sizeof(JBGIF);
- enlist_unique_header(rsp->headers, "Content-Type", "image/gif");
+ rsp->body = bindup(image_junkbuster_gif_data, image_junkbuster_gif_length);
+ if (rsp->body == NULL)
+ {
+ free_http_response(rsp);
+ return cgi_error_memory();
+ }
+ rsp->content_length = image_junkbuster_gif_length;
+
+ if (enlist_unique_header(rsp->headers, "Content-Type", "image/gif"))
+ {
+ free_http_response(rsp);
+ return cgi_error_memory();
+ }
}
else if (0 == strcmpic(p, "blank"))
{
- rsp->body = bindup(BLANKGIF, sizeof(BLANKGIF));
- rsp->content_length = sizeof(BLANKGIF);
- enlist_unique_header(rsp->headers, "Content-Type", "image/gif");
+ rsp->body = bindup(image_blank_gif_data, image_blank_gif_length);
+ if (rsp->body == NULL)
+ {
+ free_http_response(rsp);
+ return cgi_error_memory();
+ }
+ rsp->content_length = image_blank_gif_length;
+
+ if (enlist_unique_header(rsp->headers, "Content-Type", "image/gif"))
+ {
+ free_http_response(rsp);
+ return cgi_error_memory();
+ }
}
else
{
rsp->status = strdup("302 Local Redirect from Junkbuster");
- enlist_unique_header(rsp->headers, "Location", p);
+ if (rsp->status == NULL)
+ {
+ free_http_response(rsp);
+ return cgi_error_memory();
+ }
+
+ if (enlist_unique_header(rsp->headers, "Location", p))
+ {
+ free_http_response(rsp);
+ return cgi_error_memory();
+ }
}
- }
+ }
else
-#endif /* def IMAGE_BLOCKING */
+#endif /* def FEATURE_IMAGE_BLOCKING */
- /*
+ /*
* Else, generate an HTML "blocked" message:
*/
{
+ jb_err err;
+ struct map * exports;
- exports = default_exports(csp, NULL);
-#ifdef FORCE_LOAD
- exports = map(exports, "force-prefix", 1, FORCE_PREFIX, 1);
+ /* FIXME */
+#ifdef __EMX__
+ /*
+ * The entire OS/2 community will hit the stupid Netscape bug
+ * (all three of us! :-) so we'll just keep ourselves out
+ * of this contentious debate and special-case ourselves.
+ * The problem is... a this point in parsing, we don't know
+ * what the csp->http->user_agent is (yet). So we can't use
+ * it to decide if we should work around the NS bug or not.
+ */
+ rsp->status = strdup("200 Request for blocked URL");
#else
- exports = map_block_killer(exports, "force-support");
-#endif /* ndef FORCE_LOAD */
+ /*
+ * Workaround for stupid Netscape bug which prevents
+ * pages from being displayed if loading a referenced
+ * JavaScript or style sheet fails. So make it appear
+ * as if it succeeded.
+ */
+ if (csp->http->user_agent
+ && !strncmpic(csp->http->user_agent, "mozilla", 7)
+ && !strstr(csp->http->user_agent, "compatible")
+ && !strstr(csp->http->user_agent, "Opera"))
+ {
+ rsp->status = strdup("200 Request for blocked URL");
+ }
+ else
+ {
+ rsp->status = strdup("404 Request for blocked URL");
+ }
+#endif /* __EMX__ */
+ if (rsp->status == NULL)
+ {
+ free_http_response(rsp);
+ return cgi_error_memory();
+ }
+
+ exports = default_exports(csp, NULL);
+ if (exports == NULL)
+ {
+ free_http_response(rsp);
+ return cgi_error_memory();
+ }
- exports = map(exports, "hostport", 1, csp->http->hostport, 1);
- exports = map(exports, "hostport-html", 1, html_encode(csp->http->hostport), 0);
- exports = map(exports, "path", 1, csp->http->path, 1);
- exports = map(exports, "path-html", 1, html_encode(csp->http->path), 0);
+#ifdef FEATURE_FORCE_LOAD
+ err = map(exports, "force-prefix", 1, FORCE_PREFIX, 1);
+#else /* ifndef FEATURE_FORCE_LOAD */
+ err = map_block_killer(exports, "force-support");
+#endif /* ndef FEATURE_FORCE_LOAD */
- rsp->body = fill_template(csp, "blocked", exports);
- free_map(exports);
-
- rsp->status = strdup("403 Request for blocked URL");
+ err = err || map(exports, "hostport", 1, csp->http->hostport, 1);
+ err = err || map(exports, "hostport-html", 1, html_encode(csp->http->hostport), 0);
+ err = err || map(exports, "path", 1, csp->http->path, 1);
+ err = err || map(exports, "path-html", 1, html_encode(csp->http->path), 0);
+
+ if (err)
+ {
+ free_map(exports);
+ free_http_response(rsp);
+ return cgi_error_memory();
+ }
+
+ err = template_fill_for_cgi(csp, "blocked", exports, rsp);
+ if (err)
+ {
+ free_http_response(rsp);
+ return cgi_error_memory();
+ }
}
- return(finish_http_response(rsp));
+ return finish_http_response(rsp);
}
-#ifdef TRUST_FILES
+#ifdef FEATURE_TRUST
/*********************************************************************
*
* Function : trust_url FIXME: I should be called distrust_url
struct http_response *trust_url(struct client_state *csp)
{
struct http_response *rsp;
- struct map *exports = NULL;
- char buf[BUFFER_SIZE], *p = NULL;
- struct url_spec **tl, *t;
+ struct map * exports;
+ char buf[BUFFER_SIZE];
+ char *p;
+ struct url_spec **tl;
+ struct url_spec *t;
+ jb_err err;
/*
* Don't bother to work on trusted URLs
*/
if (!is_untrusted_url(csp))
{
- return NULL;
+ return NULL;
}
- /*
+ /*
* Else, prepare a response:
*/
- if (NULL == ( rsp = (struct http_response *)zalloc(sizeof(*rsp))))
+ if (NULL == (rsp = alloc_http_response()))
{
- return NULL;
+ return cgi_error_memory();
}
+
exports = default_exports(csp, NULL);
+ if (exports == NULL)
+ {
+ free_http_response(rsp);
+ return cgi_error_memory();
+ }
- /*
+ /*
* Export the host, port, and referrer information
- */
- exports = map(exports, "hostport", 1, csp->http->hostport, 1);
- exports = map(exports, "path", 1, csp->http->path, 1);
- exports = map(exports, "hostport-html", 1, html_encode(csp->http->hostport), 0);
- exports = map(exports, "path-html", 1, html_encode(csp->http->path), 0);
+ */
+ err = map(exports, "hostport", 1, csp->http->hostport, 1)
+ || map(exports, "path", 1, csp->http->path, 1)
+ || map(exports, "hostport-html", 1, html_encode(csp->http->hostport), 0)
+ || map(exports, "path-html", 1, html_encode(csp->http->path), 0);
if (csp->referrer && strlen(csp->referrer) > 9)
{
- exports = map(exports, "referrer", 1, csp->referrer + 9, 1);
- exports = map(exports, "referrer-html", 1, html_encode(csp->referrer + 9), 0);
+ err = err || map(exports, "referrer", 1, csp->referrer + 9, 1);
+ err = err || map(exports, "referrer-html", 1, html_encode(csp->referrer + 9), 0);
}
else
{
- exports = map(exports, "referrer", 1, "unknown", 1);
- exports = map(exports, "referrer-html", 1, "unknown", 1);
+ err = err || map(exports, "referrer", 1, "unknown", 1);
+ err = err || map(exports, "referrer-html", 1, "unknown", 1);
+ }
+
+ if (err)
+ {
+ free_map(exports);
+ free_http_response(rsp);
+ return cgi_error_memory();
}
/*
* Export the trust list
*/
+ p = strdup("");
for (tl = csp->config->trust_list; (t = *tl) ; tl++)
{
sprintf(buf, "<li>%s</li>\n", t->spec);
- p = strsav(p, buf);
+ string_append(&p, buf);
+ }
+ err = map(exports, "trusted-referrers", 1, p, 0);
+
+ if (err)
+ {
+ free_map(exports);
+ free_http_response(rsp);
+ return cgi_error_memory();
}
- exports = map(exports, "trusted-referrers", 1, p, 0);
- p = NULL;
/*
* Export the trust info, if available
*/
- if (csp->config->trust_info->next)
+ if (csp->config->trust_info->first)
{
- struct list *l;
+ struct list_entry *l;
- for (l = csp->config->trust_info->next; l ; l = l->next)
+ p = strdup("");
+ for (l = csp->config->trust_info->first; l ; l = l->next)
{
- sprintf(buf,
- "<li> <a href=%s>%s</a><br>\n",
- l->str, l->str);
- p = strsav(p, buf);
+ sprintf(buf, "<li> <a href=%s>%s</a><br>\n",l->str, l->str);
+ string_append(&p, buf);
}
- exports = map(exports, "trust-info", 1, p, 0);
+ err = map(exports, "trust-info", 1, p, 0);
}
else
- {
- exports = map_block_killer(exports, "have-trust-info");
- }
-
+ {
+ err = map_block_killer(exports, "have-trust-info");
+ }
+
+ if (err)
+ {
+ free_map(exports);
+ free_http_response(rsp);
+ return cgi_error_memory();
+ }
+
/*
* Export the force prefix or the force conditional block killer
*/
-#ifdef FORCE_LOAD
- exports = map(exports, "force-prefix", 1, FORCE_PREFIX, 1);
-#else
- exports = map_block_killer(exports, "force-support");
-#endif /* ndef FORCE_LOAD */
+#ifdef FEATURE_FORCE_LOAD
+ err = map(exports, "force-prefix", 1, FORCE_PREFIX, 1);
+#else /* ifndef FEATURE_FORCE_LOAD */
+ err = map_block_killer(exports, "force-support");
+#endif /* ndef FEATURE_FORCE_LOAD */
+
+ if (err)
+ {
+ free_map(exports);
+ free_http_response(rsp);
+ return cgi_error_memory();
+ }
/*
* Build the response
*/
- rsp->body = fill_template(csp, "untrusted", exports);
- free_map(exports);
-
- return(finish_http_response(rsp));
+ err = template_fill_for_cgi(csp, "untrusted", exports, rsp);
+ if (err)
+ {
+ free_http_response(rsp);
+ return cgi_error_memory();
+ }
+ return finish_http_response(rsp);
}
-#endif /* def TRUST_FILES */
+#endif /* def FEATURE_TRUST */
-#ifdef FAST_REDIRECTS
+#ifdef FEATURE_FAST_REDIRECTS
/*********************************************************************
*
* Function : redirect_url
p = q = csp->http->path;
log_error(LOG_LEVEL_REDIRECTS, "checking path for redirects: %s", p);
- /*
+ /*
* find the last URL encoded in the request
*/
- while (p = strstr(p, "http://"))
+ while ((p = strstr(p, "http://")))
{
q = p++;
}
- /*
+ /*
* if there was any, generate and return a HTTP redirect
*/
if (q != csp->http->path)
{
log_error(LOG_LEVEL_REDIRECTS, "redirecting to: %s", q);
- if (NULL == ( rsp = zalloc(sizeof(*rsp))))
+ if (NULL == (rsp = alloc_http_response()))
{
- return NULL;
+ return cgi_error_memory();
}
- rsp->status = strdup("302 Local Redirect from Junkbuster");
- enlist_unique_header(rsp->headers, "Location", q);
+ if ( enlist_unique_header(rsp->headers, "Location", q)
+ || (NULL == (rsp->status = strdup("302 Local Redirect from Junkbuster"))) )
+ {
+ free_http_response(rsp);
+ return cgi_error_memory();
+ }
- return(finish_http_response(rsp));
+ return finish_http_response(rsp);
}
else
{
- return(NULL);
+ return NULL;
}
}
-#endif /* def FAST_REDIRECTS */
+#endif /* def FEATURE_FAST_REDIRECTS */
-#ifdef IMAGE_BLOCKING
+#ifdef FEATURE_IMAGE_BLOCKING
/*********************************************************************
*
* Function : is_imageurl
*
* Description : Given a URL, decide whether it is an image or not,
* using either the info from a previous +image action
- * or, #ifdef DETECT_MSIE_IMAGES, the info from the
- * browser's accept header.
- *
+ * or, #ifdef FEATURE_IMAGE_DETECT_MSIE, the info from
+ * the browser's accept header.
+ *
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
*
*********************************************************************/
int is_imageurl(struct client_state *csp)
{
-#ifdef DETECT_MSIE_IMAGES
- if ((csp->accept_types
+#ifdef FEATURE_IMAGE_DETECT_MSIE
+ if ((csp->accept_types
& (ACCEPT_TYPE_IS_MSIE|ACCEPT_TYPE_MSIE_IMAGE|ACCEPT_TYPE_MSIE_HTML))
== (ACCEPT_TYPE_IS_MSIE|ACCEPT_TYPE_MSIE_IMAGE))
{
return 1;
}
- else if ((csp->accept_types
+ else if ((csp->accept_types
& (ACCEPT_TYPE_IS_MSIE|ACCEPT_TYPE_MSIE_IMAGE|ACCEPT_TYPE_MSIE_HTML))
== (ACCEPT_TYPE_IS_MSIE|ACCEPT_TYPE_MSIE_HTML))
{
return 0;
}
-#endif
+#endif /* def FEATURE_IMAGE_DETECT_MSIE */
return ((csp->action->flags & ACTION_IMAGE) != 0);
}
-#endif /* def IMAGE_BLOCKING */
+#endif /* def FEATURE_IMAGE_BLOCKING */
-#ifdef TRUST_FILES
+#ifdef FEATURE_COOKIE_JAR
/*********************************************************************
*
* Function : is_untrusted_url
struct http_request rhttp[1];
char *p, *h;
+ /*
+ * If we don't have a trustlist, we trust everybody
+ */
if (((fl = csp->tlist) == NULL) || ((b = fl->f) == NULL))
{
return(0);
}
+
+ /*
+ * Do we trust the request URL itself?
+ */
*url = dsplit(csp->http->host);
/* if splitting the domain fails, punt */
if ((csp->referrer == NULL)|| (strlen(csp->referrer) <= 9))
{
/* no referrer was supplied */
- return(1);
+ return(1);
}
/* forge a URL from the referrer so we can use
return(1);
}
+
+ /*
+ * If not, do we maybe trust its referrer?
+ */
*url = dsplit(rhttp->host);
/* if splitting the domain fails, punt */
}
}
}
-
+ return(1);
}
-#endif /* def TRUST_FILES */
+#endif /* def FEATURE_COOKIE_JAR */
-#ifdef PCRS
/*********************************************************************
*
- * Function : re_process_buffer
+ * Function : pcrs_filter_response
*
* Description : Apply all the pcrs jobs from the joblist (re_filterfile)
- * to the text buffer that's been accumulated in
+ * to the text buffer that's been accumulated in
* csp->iob->buf and set csp->content_length to the modified
- * size.
+ * size and raise the CSP_FLAG_MODIFIED flag if appropriate.
*
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
*
* Returns : a pointer to the (newly allocated) modified buffer.
- * or an empty string in case something went wrong
- *
+ * or NULL in case something went wrong
+ *
*********************************************************************/
-char *re_process_buffer(struct client_state *csp)
+char *pcrs_filter_response(struct client_state *csp)
{
int hits=0;
- int size = csp->iob->eod - csp->iob->cur;
+ size_t size;
char *old = csp->iob->cur, *new = NULL;
pcrs_job *job;
struct file_list *fl;
struct re_filterfile_spec *b;
- /* Sanity first ;-) */
- if (size <= 0)
+ /* Sanity first */
+ if (csp->iob->cur >= csp->iob->eod)
+ {
+ return(NULL);
+ }
+ size = csp->iob->eod - csp->iob->cur;
+
+ /*
+ * If the body has a "chunked" transfer-encoding,
+ * get rid of it first, adjusting size and iob->eod
+ */
+ if (csp->flags & CSP_FLAG_CHUNKED)
{
- return(strdup(""));
+ log_error(LOG_LEVEL_RE_FILTER, "Need to de-chunk first");
+ if (0 == (size = remove_chunked_transfer_coding(csp->iob->cur, size)))
+ {
+ return(NULL);
+ }
+ csp->iob->eod = csp->iob->cur + size;
+ csp->flags |= CSP_FLAG_MODIFIED;
}
if ( ( NULL == (fl = csp->rlist) ) || ( NULL == (b = fl->f) ) )
{
log_error(LOG_LEVEL_ERROR, "Unable to get current state of regexp filtering.");
- return(strdup(""));
+ return(NULL);
+ }
+
+ if ( NULL == b->joblist )
+ {
+ log_error(LOG_LEVEL_RE_FILTER, "Empty joblist. Nothing to do.");
+ return(NULL);
}
log_error(LOG_LEVEL_RE_FILTER, "re_filtering %s%s (size %d) ...",
log_error(LOG_LEVEL_RE_FILTER, " produced %d hits (new size %d).", hits, size);
- csp->content_length = size;
+ /*
+ * If there were no hits, destroy our copy and let
+ * chat() use the original in csp->iob
+ */
+ if (!hits)
+ {
+ free(new);
+ return(NULL);
+ }
- /* fwiw, reset the iob */
+ csp->flags |= CSP_FLAG_MODIFIED;
+ csp->content_length = size;
IOB_RESET(csp);
+
return(new);
}
-#endif /* def PCRS */
+
+
+/*********************************************************************
+ *
+ * Function : gif_deanimate_response
+ *
+ * Description : Deanimate the GIF image that has been accumulated in
+ * csp->iob->buf, set csp->content_length to the modified
+ * size and raise the CSP_FLAG_MODIFIED flag.
+ *
+ * Parameters :
+ * 1 : csp = Current client state (buffers, headers, etc...)
+ *
+ * Returns : a pointer to the (newly allocated) modified buffer.
+ * or NULL in case something went wrong.
+ *
+ *********************************************************************/
+char *gif_deanimate_response(struct client_state *csp)
+{
+ struct binbuffer *in, *out;
+ char *p;
+ int size = csp->iob->eod - csp->iob->cur;
+
+ /*
+ * If the body has a "chunked" transfer-encoding,
+ * get rid of it first, adjusting size and iob->eod
+ */
+ if (csp->flags & CSP_FLAG_CHUNKED)
+ {
+ log_error(LOG_LEVEL_DEANIMATE, "Need to de-chunk first");
+ if (0 == (size = remove_chunked_transfer_coding(csp->iob->cur, size)))
+ {
+ return(NULL);
+ }
+ csp->iob->eod = csp->iob->cur + size;
+ csp->flags |= CSP_FLAG_MODIFIED;
+ }
+
+ if ( (NULL == (in = (struct binbuffer *)zalloc(sizeof *in )))
+ || (NULL == (out = (struct binbuffer *)zalloc(sizeof *out))) )
+ {
+ log_error(LOG_LEVEL_DEANIMATE, "failed! (no mem)");
+ return NULL;
+ }
+
+ in->buffer = csp->iob->cur;
+ in->size = size;
+
+ if (gif_deanimate(in, out, strncmp("last", csp->action->string[ACTION_STRING_DEANIMATE], 4)))
+ {
+ log_error(LOG_LEVEL_DEANIMATE, "failed! (gif parsing)");
+ free(in);
+ buf_free(out);
+ return(NULL);
+ }
+ else
+ {
+ log_error(LOG_LEVEL_DEANIMATE, "Success! GIF shrunk from %d bytes to %d.", size, out->offset);
+ csp->content_length = out->offset;
+ csp->flags |= CSP_FLAG_MODIFIED;
+ p = out->buffer;
+ free(in);
+ free(out);
+ return(p);
+ }
+
+}
+
+
+/*********************************************************************
+ *
+ * Function : remove_chunked_transfer_coding
+ *
+ * Description : In-situ remove the "chunked" transfer coding as defined
+ * in rfc2616 from a buffer.
+ *
+ * Parameters :
+ * 1 : buffer = Pointer to the text buffer
+ * 2 : size = Number of bytes to be processed
+ *
+ * Returns : The new size, i.e. the number of bytes from buffer which
+ * are occupied by the stripped body, or 0 in case something
+ * went wrong
+ *
+ *********************************************************************/
+int remove_chunked_transfer_coding(char *buffer, const size_t size)
+{
+ size_t newsize = 0;
+ unsigned int chunksize = 0;
+ char *from_p, *to_p;
+
+ assert(buffer);
+ from_p = to_p = buffer;
+
+ if (sscanf(buffer, "%x", &chunksize) != 1)
+ {
+ log_error(LOG_LEVEL_ERROR, "Invalid first chunksize while stripping \"chunked\" transfer coding");
+ return(0);
+ }
+
+ while (chunksize > 0)
+ {
+ if (NULL == (from_p = strstr(from_p, "\r\n")))
+ {
+ log_error(LOG_LEVEL_ERROR, "Parse error while stripping \"chunked\" transfer coding");
+ return(0);
+ }
+ newsize += chunksize;
+ from_p += 2;
+
+ memmove(to_p, from_p, (size_t) chunksize);
+ to_p = buffer + newsize;
+ from_p += chunksize + 2;
+
+ if (sscanf(from_p, "%x", &chunksize) != 1)
+ {
+ log_error(LOG_LEVEL_ERROR, "Parse error while stripping \"chunked\" transfer coding");
+ return(0);
+ }
+ }
+
+ /* FIXME: Should this get its own loglevel? */
+ log_error(LOG_LEVEL_RE_FILTER, "De-chunking successful. Shrunk from %d to %d\n", size, newsize);
+ return(newsize);
+
+}
/*********************************************************************
* Returns : N/A
*
*********************************************************************/
-void url_actions(struct http_request *http,
+void url_actions(struct http_request *http,
struct client_state *csp)
{
struct file_list *fl;
}
apply_url_actions(csp->action, http, b);
+
}
* Returns : N/A
*
*********************************************************************/
-void apply_url_actions(struct current_action_spec *action,
- struct http_request *http,
+void apply_url_actions(struct current_action_spec *action,
+ struct http_request *http,
struct url_actions *b)
{
struct url_spec url[1];
const struct forward_spec * forward_url(struct http_request *http,
struct client_state *csp)
{
- static const struct forward_spec fwd_default[1] = { 0 }; /* All zeroes */
+ static const struct forward_spec fwd_default[1] = { FORWARD_SPEC_INITIALIZER };
struct forward_spec *fwd = csp->config->forward;
struct url_spec url[1];
* 1 : domain = a URL address
*
* Returns : url_spec structure populated with dbuf, dcnt and dvec.
+ * On error, the dbuf field will be set to NULL. (As
+ * will all the others, but you don't need to check
+ * them).
+ *
+ * FIXME: Returning a structure is horribly inefficient, please can
+ * this structure take a (struct url_spec * dest)
+ * pointer instead?
*
*********************************************************************/
struct url_spec dsplit(char *domain)
if (domain[strlen(domain) - 1] == '.')
{
- ret->unanchored |= ANCHOR_RIGHT;
- }
- if (domain[0] == '.')
+ ret->unanchored |= ANCHOR_RIGHT;
+ }
+
+ if (domain[0] == '.')
{
- ret->unanchored |= ANCHOR_LEFT;
- }
+ ret->unanchored |= ANCHOR_LEFT;
+ }
ret->dbuf = strdup(domain);
+ if (NULL == ret->dbuf)
+ {
+ return *ret;
+ }
/* map to lower case */
- for (p = ret->dbuf; *p ; p++) *p = tolower(*p);
+ for (p = ret->dbuf; *p ; p++)
+ {
+ *p = tolower((int)(unsigned char)*p);
+ }
/* split the domain name into components */
ret->dcnt = ssplit(ret->dbuf, ".", v, SZ(v), 1, 1);
- if (ret->dcnt <= 0)
+ if (ret->dcnt < 0)
{
+ free(ret->dbuf);
memset(ret, '\0', sizeof(ret));
- return(*ret);
+ return *ret;
+ }
+ else if (ret->dcnt == 0)
+ {
+ return *ret;
}
/* save a copy of the pointers in dvec */
size = ret->dcnt * sizeof(*ret->dvec);
- if ((ret->dvec = (char **)malloc(size)))
+ ret->dvec = (char **)malloc(size);
+ if (NULL == ret->dvec)
{
- memcpy(ret->dvec, v, size);
+ free(ret->dbuf);
+ memset(ret, '\0', sizeof(ret));
+ return *ret;
}
+ memcpy(ret->dvec, v, size);
- return(*ret);
+ return *ret;
}
*
* Function : simple_domaincmp
*
- * Description : Domain-wise Compare fqdn's. The comparison is
+ * Description : Domain-wise Compare fqdn's. The comparison is
* both left- and right-anchored. The individual
* domain names are compared with simplematch().
* This is only used by domaincmp.
}
return 0;
+
}
}
return 1;
}
-}
+}
/*
projects / privoxy.git / blobdiff