-const char filters_rcs[] = "$Id: filters.c,v 1.15 2001/06/03 11:03:48 oes Exp $";
+const char filters_rcs[] = "$Id: filters.c,v 1.31 2001/09/16 11:38:02 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
*
* Revisions :
* $Log: filters.c,v $
- * Revision 1.15 2001/06/03 11:03:48 oes
- * Makefile/in
- *
- * introduced cgi.c
- *
- * actions.c:
- *
- * adapted to new enlist_unique arg format
- *
- * conf loadcfg.c
- *
- * introduced confdir option
- *
- * filters.c filtrers.h
- *
- * extracted-CGI relevant stuff
- *
- * jbsockets.c
- *
- * filled comment
- *
- * jcc.c
- *
- * support for new cgi mechansim
- *
- * list.c list.h
- *
- * functions for new list type: "map"
- * extended enlist_unique
- *
- * miscutil.c .h
- * introduced bindup()
- *
- * parsers.c parsers.h
- *
- * deleted const struct interceptors
- *
- * pcrs.c
- * added FIXME
- *
- * project.h
- *
- * added struct map
- * added struct http_response
- * changes struct interceptors to struct cgi_dispatcher
- * moved HTML stuff to cgi.h
- *
- * re_filterfile:
- *
- * changed
- *
- * showargs.c
- * NO TIME LEFT
+ * 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
+ *
+ * Revision 1.16 2001/06/07 23:10:26 jongfoster
+ * Allowing unanchored domain patterns to back off and retry
+ * if they partially match. Optimized right-anchored patterns.
+ * Moving ACL and forward files into config file.
+ * Replacing struct gateway with struct forward_spec
+ *
+ * Revision 1.15 2001/06/03 19:12:00 oes
+ * extracted-CGI relevant stuff
*
* Revision 1.14 2001/06/01 10:30:55 oes
* Added optional left-anchoring to domaincmp
#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 file_list *fl;
- struct access_control_list *a, *acl;
+ struct access_control_list *acl = csp->config->acl;
/* if not using an access control list, then permit the connection */
- if (((fl = csp->alist) == NULL) ||
- ((acl = (struct access_control_list *) fl->f) == NULL))
+ if (acl == NULL)
{
return(0);
}
/* search the list */
- for (a = acl->next ; a ; a = a->next)
+ while (acl != NULL)
{
- if ((csp->ip_addr_long & a->src->mask) == a->src->addr)
+ if ((csp->ip_addr_long & acl->src->mask) == acl->src->addr)
{
if (dst == NULL)
{
/* Just want to check if they have any access */
- if (a->action == ACL_PERMIT)
+ if (acl->action == ACL_PERMIT)
{
return(0);
}
}
- else if ( ((dst->addr & a->dst->mask) == a->dst->addr)
- && ((dst->port == a->dst->port) || (a->dst->port == 0)))
+ else if ( ((dst->addr & acl->dst->mask) == acl->dst->addr)
+ && ((dst->port == acl->dst->port) || (acl->dst->port == 0)))
{
- if (a->action == ACL_PERMIT)
+ if (acl->action == ACL_PERMIT)
{
return(0);
}
}
}
}
+ acl = acl->next;
}
return(1);
return(0);
}
-#endif /* def ACL_FILES */
+#endif /* def FEATURE_ACL */
/*********************************************************************
* Description : Called from `chat'. Check to see if we need to block this.
*
* Parameters :
- * 1 : http = http_request request to "check" for blocked
- * 2 : csp = Current client state (buffers, headers, etc...)
+ * 1 : csp = Current client state (buffers, headers, etc...)
*
- * Returns : NULL => unblocked, else string to HTML block description.
+ * Returns : NULL => unblocked, else HTTP block response
*
*********************************************************************/
-char *block_url(struct http_request *http, struct client_state *csp)
+struct http_response *block_url(struct client_state *csp)
{
+#ifdef FEATURE_IMAGE_BLOCKING
char *p;
- int n;
- int factor = 2;
+#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);
}
+
+ /*
+ * Else, prepare a response
+ */
+ if (NULL == (rsp = alloc_http_response()))
+ {
+ return NULL;
+ }
+
+ /*
+ * If it's an image-url, send back an image or redirect
+ * as specified by the relevant +image action
+ */
+#ifdef FEATURE_IMAGE_BLOCKING
+ if (((csp->action->flags & ACTION_IMAGE_BLOCKER) != 0)
+ && is_imageurl(csp))
+ {
+ /* 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(image_junkbuster_gif_data, image_junkbuster_gif_length);
+ rsp->content_length = image_junkbuster_gif_length;
+ enlist_unique_header(rsp->headers, "Content-Type", "image/gif");
+ }
+
+ else if (0 == strcmpic(p, "blank"))
+ {
+ rsp->body = bindup(image_blank_gif_data, image_blank_gif_length);
+ rsp->content_length = image_blank_gif_length;
+ enlist_unique_header(rsp->headers, "Content-Type", "image/gif");
+ }
+
+ else
+ {
+ rsp->status = strdup("302 Local Redirect from Junkbuster");
+ enlist_unique_header(rsp->headers, "Location", p);
+ }
+ }
else
+#endif /* def FEATURE_IMAGE_BLOCKING */
+
+ /*
+ * Else, generate an HTML "blocked" message:
+ */
{
-#ifdef FORCE_LOAD
- factor++;
-#endif /* def FORCE_LOAD */
+ struct map * exports = default_exports(csp, NULL);
+#ifdef FEATURE_FORCE_LOAD
+ map(exports, "force-prefix", 1, FORCE_PREFIX, 1);
+#else /* ifndef FEATURE_FORCE_LOAD */
+ map_block_killer(exports, "force-support");
+#endif /* ndef FEATURE_FORCE_LOAD */
+
+ map(exports, "hostport", 1, csp->http->hostport, 1);
+ map(exports, "hostport-html", 1, html_encode(csp->http->hostport), 0);
+ map(exports, "path", 1, csp->http->path, 1);
+ map(exports, "path-html", 1, html_encode(csp->http->path), 0);
+
+ rsp->body = template_load(csp, "blocked");
+ template_fill(&rsp->body, exports);
+ free_map(exports);
+
+ /*
+ * 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");
+ }
+
+ }
- n = strlen(CBLOCK);
- n += factor * strlen(http->hostport);
- n += factor * strlen(http->path);
+ return(finish_http_response(rsp));
- p = (char *)malloc(n);
+}
-#ifdef FORCE_LOAD
- sprintf(p, CBLOCK, http->hostport, http->path, http->hostport, http->path,
- http->hostport, http->path);
-#else
- sprintf(p, CBLOCK, http->hostport, http->path, http->hostport, http->path);
-#endif /* def FORCE_LOAD */
- return(p);
+#ifdef FEATURE_TRUST
+/*********************************************************************
+ *
+ * Function : trust_url FIXME: I should be called distrust_url
+ *
+ * Description : Calls is_untrusted_url to determine if the URL is trusted
+ * and if not, returns a HTTP 304 response with a reject message.
+ *
+ * Parameters :
+ * 1 : csp = Current client state (buffers, headers, etc...)
+ *
+ * Returns : NULL => trusted, else http_response.
+ *
+ *********************************************************************/
+struct http_response *trust_url(struct client_state *csp)
+{
+ struct http_response *rsp;
+ struct map * exports;
+ char buf[BUFFER_SIZE], *p = NULL;
+ struct url_spec **tl, *t;
+
+ /*
+ * Don't bother to work on trusted URLs
+ */
+ if (!is_untrusted_url(csp))
+ {
+ return NULL;
}
+
+ /*
+ * Else, prepare a response:
+ */
+ if (NULL == (rsp = alloc_http_response()))
+ {
+ return NULL;
+ }
+
+ exports = default_exports(csp, NULL);
+
+ /*
+ * Export the host, port, and referrer information
+ */
+ 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)
+ {
+ map(exports, "referrer", 1, csp->referrer + 9, 1);
+ map(exports, "referrer-html", 1, html_encode(csp->referrer + 9), 0);
+ }
+ else
+ {
+ map(exports, "referrer", 1, "unknown", 1);
+ map(exports, "referrer-html", 1, "unknown", 1);
+ }
+
+ /*
+ * Export the trust list
+ */
+ for (tl = csp->config->trust_list; (t = *tl) ; tl++)
+ {
+ sprintf(buf, "<li>%s</li>\n", t->spec);
+ p = strsav(p, buf);
+ }
+ map(exports, "trusted-referrers", 1, p, 0);
+ p = NULL;
+
+ /*
+ * Export the trust info, if available
+ */
+ if (csp->config->trust_info->first)
+ {
+ struct list_entry *l;
+
+ 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);
+ }
+ map(exports, "trust-info", 1, p, 0);
+ }
+ else
+ {
+ map_block_killer(exports, "have-trust-info");
+ }
+
+ /*
+ * Export the force prefix or the force conditional block killer
+ */
+#ifdef FEATURE_FORCE_LOAD
+ map(exports, "force-prefix", 1, FORCE_PREFIX, 1);
+#else /* ifndef FEATURE_FORCE_LOAD */
+ map_block_killer(exports, "force-support");
+#endif /* ndef FEATURE_FORCE_LOAD */
+
+ /*
+ * Build the response
+ */
+ rsp->body = template_load(csp, "untrusted");
+ template_fill(&rsp->body, exports);
+ free_map(exports);
+
+ return(finish_http_response(rsp));
+
}
+#endif /* def FEATURE_TRUST */
-#ifdef IMAGE_BLOCKING
+#ifdef FEATURE_FAST_REDIRECTS
/*********************************************************************
*
- * Function : block_imageurl
+ * Function : redirect_url
*
- * Description : Given a URL which is blocked, decide whether to
- * send the "blocked" image or HTML.
+ * Description : Checks for redirection URLs and returns a HTTP redirect
+ * to the destination URL, if necessary
*
* Parameters :
- * 1 : http = URL to check.
- * 2 : csp = Current client state (buffers, headers, etc...)
+ * 1 : csp = Current client state (buffers, headers, etc...)
+ *
+ * Returns : NULL if URL was clean, HTTP redirect otherwise.
+ *
+ *********************************************************************/
+struct http_response *redirect_url(struct client_state *csp)
+{
+ char *p, *q;
+ struct http_response *rsp;
+
+ 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://")))
+ {
+ 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 = alloc_http_response()))
+ {
+ return NULL;
+ }
+
+ rsp->status = strdup("302 Local Redirect from Junkbuster");
+ enlist_unique_header(rsp->headers, "Location", q);
+
+ return(finish_http_response(rsp));
+ }
+ else
+ {
+ return(NULL);
+ }
+
+}
+#endif /* def FEATURE_FAST_REDIRECTS */
+
+
+#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 FEATURE_IMAGE_DETECT_MSIE, the info from
+ * the browser's accept header.
+ *
+ * Parameters :
+ * 1 : csp = Current client state (buffers, headers, etc...)
*
- * Returns : True (nonzero) if URL is in image list, false (0)
+ * Returns : True (nonzero) if URL is an image, false (0)
* otherwise
*
*********************************************************************/
-int block_imageurl(struct http_request *http, struct client_state *csp)
+int is_imageurl(struct client_state *csp)
{
-#ifdef DETECT_MSIE_IMAGES
+#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 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 : trust_url
+ * Function : is_untrusted_url
+ *
+ * Description : Should we "distrust" this URL (and block it)?
*
- * Description : Should we "trust" this URL? See "trustfile" line in config.
+ * Yes if it matches a line in the trustfile, or if the
+ * referrer matches a line starting with "+" in the
+ * trustfile.
+ * No otherwise.
*
* Parameters :
- * 1 : http = http_request request for requested URL
- * 2 : csp = Current client state (buffers, headers, etc...)
+ * 1 : csp = Current client state (buffers, headers, etc...)
*
- * Returns : NULL => trusted, else string to HTML "untrusted" description.
+ * Returns : 0 => trusted, 1 => untrusted
*
*********************************************************************/
-char *trust_url(struct http_request *http, struct client_state *csp)
+int is_untrusted_url(struct client_state *csp)
{
struct file_list *fl;
struct block_spec *b;
struct url_spec url[1], **tl, *t;
- char *p, *h;
- char *hostport, *path, *refer;
struct http_request rhttp[1];
- int n;
+ char *p, *h;
+ /*
+ * If we don't have a trustlist, we trust everybody
+ */
if (((fl = csp->tlist) == NULL) || ((b = fl->f) == NULL))
{
- return(NULL);
+ return(0);
}
- *url = dsplit(http->host);
+
+ /*
+ * Do we trust the request URL itself?
+ */
+ *url = dsplit(csp->http->host);
/* if splitting the domain fails, punt */
- if (url->dbuf == NULL) return(NULL);
+ if (url->dbuf == NULL) return(0);
memset(rhttp, '\0', sizeof(*rhttp));
for (b = b->next; b ; b = b->next)
{
- if ((b->url->port == 0) || (b->url->port == http->port))
+ if ((b->url->port == 0) || (b->url->port == csp->http->port))
{
if ((b->url->domain[0] == '\0') || (domaincmp(b->url, url) == 0))
{
if ((b->url->path == NULL) ||
#ifdef REGEX
- (regexec(b->url->preg, http->path, 0, NULL, 0) == 0)
+ (regexec(b->url->preg, csp->http->path, 0, NULL, 0) == 0)
#else
- (strncmp(b->url->path, http->path, b->url->pathlen) == 0)
+ (strncmp(b->url->path, csp->http->path, b->url->pathlen) == 0)
#endif
)
{
freez(url->dbuf);
freez(url->dvec);
- if (b->reject == 0) return(NULL);
+ if (b->reject == 0) return(0);
- hostport = url_encode(http->hostport);
- path = url_encode(http->path);
-
- if (csp->referrer)
- {
- refer = url_encode(csp->referrer);
- }
- else
- {
- refer = url_encode("undefined");
- }
-
- n = strlen(CTRUST);
- n += strlen(hostport);
- n += strlen(path);
- n += strlen(refer);
-
- p = (char *)malloc(n);
-
- sprintf(p, CTRUST, hostport, path, refer);
-
- freez(hostport);
- freez(path);
- freez(refer);
-
- return(p);
+ return(1);
}
}
}
if ((csp->referrer == NULL)|| (strlen(csp->referrer) <= 9))
{
/* no referrer was supplied */
- goto trust_url_not_trusted;
+ return(1);
}
/* forge a URL from the referrer so we can use
p = strsav(p, " HTTP/1.0");
parse_http_request(p, rhttp, csp);
+ freez(p);
if (rhttp->cmd == NULL)
{
- freez(p);
- goto trust_url_not_trusted;
+ return(1);
}
- freez(p);
+ /*
+ * If not, do we maybe trust its referrer?
+ */
*url = dsplit(rhttp->host);
/* if splitting the domain fails, punt */
- if (url->dbuf == NULL) goto trust_url_not_trusted;
+ if (url->dbuf == NULL) return(1);
for (tl = csp->config->trust_list; (t = *tl) ; tl++)
{
h = NULL;
h = strsav(h, "~");
- h = strsav(h, http->hostport);
+ h = strsav(h, csp->http->hostport);
- p = http->path;
+ p = csp->http->path;
if ((*p++ == '/')
&& (*p++ == '~'))
{
if ((p = strchr(p, '/')))
{
*p = '\0';
- h = strsav(h, http->path);
+ h = strsav(h, csp->http->path); /* FIXME: p?! */
h = strsav(h, "/");
}
}
- free_http_request(rhttp);
-
fprintf(fp, "%s\n", h);
freez(h);
fclose(fp);
}
- return(NULL);
+ return(0);
}
}
}
}
-
-trust_url_not_trusted:
- free_http_request(rhttp);
-
- hostport = url_encode(http->hostport);
- path = url_encode(http->path);
-
- if (csp->referrer)
- {
- refer = url_encode(csp->referrer);
- }
- else
- {
- refer = url_encode("undefined");
- }
-
- n = strlen(CTRUST);
- n += strlen(hostport);
- n += strlen(path);
- n += strlen(refer);
-
- p = (char *)malloc(n);
- sprintf(p, CTRUST, hostport, path, refer);
-
- freez(hostport);
- freez(path);
- freez(refer);
-
- return(p);
-
+ return(1);
}
-#endif /* def TRUST_FILES */
+#endif /* def FEATURE_COOKIE_JAR */
-#ifdef PCRS
/*********************************************************************
*
- * Function : re_process_buffer
+ * Function : pcrs_filter_response
*
- * Description : Apply all jobs from the joblist (aka. Perl regexp's) to
- * the text buffer that's been accumulated in csp->iob->buf
- * and set csp->content_length to the modified size.
+ * Description : Apply all the pcrs jobs from the joblist (re_filterfile)
+ * to the text buffer that's been accumulated in
+ * csp->iob->buf and set csp->content_length to the modified
+ * size.
*
* 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 *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;
- char *old=csp->iob->cur, *new = NULL;
- pcrs_job *job, *joblist;
+
+ char *old = csp->iob->cur, *new = NULL;
+ pcrs_job *job;
struct file_list *fl;
struct re_filterfile_spec *b;
/* Sanity first ;-) */
if (size <= 0)
{
- return(strdup(""));
+ return(NULL);
}
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);
}
- joblist = b->joblist;
-
+ 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) ...",
csp->http->hostport, csp->http->path, size);
/* Apply all jobs from the joblist */
- for (job = joblist; NULL != job; job = job->next)
+ for (job = b->joblist; NULL != job; job = job->next)
{
- hits += pcrs_exec_substitution(job, old, size, &new, &size);
+ hits += pcrs_execute(job, old, size, &new, &size);
if (old != csp->iob->cur) free(old);
old=new;
}
return(new);
}
-#endif /* def PCRS */
+
+
+/*********************************************************************
+ *
+ * Function : gif_deanimate_response
+ *
+ * Description : Deanimate the GIF image that has been accumulated in
+ * csp->iob->buf and set csp->content_length to the modified
+ * size.
+ *
+ * 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 ( (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;
+ p = out->buffer;
+ free(in);
+ free(out);
+ return(p);
+ }
+
+}
/*********************************************************************
}
apply_url_actions(csp->action, http, b);
+
}
* 1 : http = http_request request for current URL
* 2 : csp = Current client state (buffers, headers, etc...)
*
- * Returns : Return gw_default for no forward match,
- * else a gateway pointer to a specific forwarding proxy.
+ * Returns : Pointer to forwarding information.
*
*********************************************************************/
-const struct gateway *forward_url(struct http_request *http, struct client_state *csp)
+const struct forward_spec * forward_url(struct http_request *http,
+ struct client_state *csp)
{
- struct file_list *fl;
- struct forward_spec *b;
+ static const struct forward_spec fwd_default[1] = { FORWARD_SPEC_INITIALIZER };
+ struct forward_spec *fwd = csp->config->forward;
struct url_spec url[1];
- if (((fl = csp->flist) == NULL) || ((b = fl->f) == NULL))
+ if (fwd == NULL)
{
- return(gw_default);
+ return(fwd_default);
}
*url = dsplit(http->host);
/* if splitting the domain fails, punt */
- if (url->dbuf == NULL) return(gw_default);
+ if (url->dbuf == NULL)
+ {
+ return(fwd_default);
+ }
- for (b = b->next; b ; b = b->next)
+ while (fwd != NULL)
{
- if ((b->url->port == 0) || (b->url->port == http->port))
+ if ((fwd->url->port == 0) || (fwd->url->port == http->port))
{
- if ((b->url->domain[0] == '\0') || (domaincmp(b->url, url) == 0))
+ if ((fwd->url->domain[0] == '\0') || (domaincmp(fwd->url, url) == 0))
{
- if ((b->url->path == NULL) ||
+ if ((fwd->url->path == NULL) ||
#ifdef REGEX
- (regexec(b->url->preg, http->path, 0, NULL, 0) == 0)
+ (regexec(fwd->url->preg, http->path, 0, NULL, 0) == 0)
#else
- (strncmp(b->url->path, http->path, b->url->pathlen) == 0)
+ (strncmp(fwd->url->path, http->path, fwd->url->pathlen) == 0)
#endif
)
{
freez(url->dbuf);
freez(url->dvec);
- return(b->gw);
+ return(fwd);
}
}
}
+ fwd = fwd->next;
}
freez(url->dbuf);
freez(url->dvec);
- return(gw_default);
+ return(fwd_default);
}
struct url_spec dsplit(char *domain)
{
struct url_spec ret[1];
- char *v[BUFSIZ];
+ char *v[BUFFER_SIZE];
int size;
char *p;
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);
memcpy(ret->dvec, v, size);
}
-
return(*ret);
}
+/*********************************************************************
+ *
+ * Function : simple_domaincmp
+ *
+ * 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.
+ *
+ * Parameters :
+ * 1 : pv = array of patterns to compare
+ * 2 : fv = array of domain components to compare
+ * 3 : len = length of the arrays (both arrays are the
+ * same length - if they weren't, it couldn't
+ * possibly be a match).
+ *
+ * Returns : 0 => domains are equivalent, else no match.
+ *
+ *********************************************************************/
+static int simple_domaincmp(char **pv, char **fv, int len)
+{
+ int n;
+
+ for (n = 0; n < len; n++)
+ {
+ if (simplematch(pv[n], fv[n]))
+ {
+ return 1;
+ }
+ }
+
+ return 0;
+
+}
+
+
/*********************************************************************
*
* Function : domaincmp
* pattern->unachored, the comparison is un-, left-,
* right-anchored, or both.
* The individual domain names are compared with
- * trivialmatch().
+ * simplematch().
*
* Parameters :
* 1 : pattern = a domain that may contain a '*' as a wildcard.
int domaincmp(struct url_spec *pattern, struct url_spec *fqdn)
{
char **pv, **fv; /* vectors */
- int pn, fn; /* counters */
- char *p, *f; /* chars */
+ int plen, flen;
+ int unanchored = pattern->unanchored & (ANCHOR_RIGHT | ANCHOR_LEFT);
- pv = pattern->dvec;
- fv = fqdn->dvec;
- fn = pn = 0;
+ plen = pattern->dcnt;
+ flen = fqdn->dcnt;
- while (fn < fqdn->dcnt && pn < pattern->dcnt)
+ if (flen < plen)
{
- p = pv[pn];
- f = fv[fn];
+ /* fqdn is too short to match this pattern */
+ return 1;
+ }
- if (simplematch(p, f))
+ pv = pattern->dvec;
+ fv = fqdn->dvec;
+
+ if (unanchored == ANCHOR_LEFT)
+ {
+ /*
+ * Right anchored.
+ *
+ * Convert this into a fully anchored pattern with
+ * the fqdn and pattern the same length
+ */
+ fv += (flen - plen); /* flen - plen >= 0 due to check above */
+ return simple_domaincmp(pv, fv, plen);
+ }
+ else if (unanchored == 0)
+ {
+ /* Fully anchored, check length */
+ if (flen != plen)
{
- if(pn || !(pattern->unanchored & ANCHOR_LEFT))
- {
- return 1;
- }
+ return 1;
}
- else
+ return simple_domaincmp(pv, fv, plen);
+ }
+ else if (unanchored == ANCHOR_RIGHT)
+ {
+ /* Left anchored, ignore all extra in fqdn */
+ return simple_domaincmp(pv, fv, plen);
+ }
+ else
+ {
+ /* Unanchored */
+ int n;
+ int maxn = flen - plen;
+ for (n = 0; n <= maxn; n++)
{
- pn++;
+ if (!simple_domaincmp(pv, fv, plen))
+ {
+ return 0;
+ }
+ /*
+ * Doesn't match from start of fqdn
+ * Try skipping first part of fqdn
+ */
+ fv++;
}
- fn++;
+ return 1;
}
- return ((pn < pattern->dcnt) || ((fn < fqdn->dcnt) && !(pattern->unanchored & ANCHOR_RIGHT)));
-
}
-
/*
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projects / privoxy.git / blobdiff