-const char filters_rcs[] = "$Id: filters.c,v 1.16 2001/06/07 23:10:26 jongfoster Exp $";
+const char filters_rcs[] = "$Id: filters.c,v 1.17 2001/06/09 10:55:28 jongfoster Exp $";
/*********************************************************************
*
* File : $Source: /cvsroot/ijbswa/current/filters.c,v $
*
* Revisions :
* $Log: filters.c,v $
+ * 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.
* Revision 1.15 2001/06/03 19:12:00 oes
* extracted-CGI relevant stuff
*
- * 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 1.14 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"
#ifdef _WIN32
#include "win32.h"
* 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)
{
char *p;
- int n;
- int factor = 2;
+ struct http_response *rsp;
+ struct map *exports = NULL;
+ /*
+ * 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 = (struct http_response *)zalloc(sizeof(*rsp))))
+ {
+ return NULL;
+ }
+
+ /*
+ * 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)
+ && 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(JBGIF, sizeof(JBGIF));
+ rsp->content_length = sizeof(JBGIF);
+ enlist_unique_header(rsp->headers, "Content-Type", "image/gif");
+ }
+
+ 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");
+ }
+
+ else
+ {
+ rsp->status = strdup("302 Local Redirect from Junkbuster");
+ enlist_unique_header(rsp->headers, "Location", p);
+ }
+ }
else
+#endif /* def IMAGE_BLOCKING */
+
+ /*
+ * Else, generate an HTML "blocked" message:
+ */
{
+
+ exports = default_exports(csp, NULL);
#ifdef FORCE_LOAD
- factor++;
-#endif /* def FORCE_LOAD */
+ exports = map(exports, "force-prefix", 1, FORCE_PREFIX, 1);
+#else
+ exports = map_block_killer(exports, "force-support");
+#endif /* ndef FORCE_LOAD */
+
+ 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);
+
+ rsp->body = fill_template(csp, "blocked", exports);
+ free_map(exports);
+
+ rsp->status = strdup("403 Request for blocked URL");
+ }
+
+ return(finish_http_response(rsp));
+
+}
+
+
+#ifdef TRUST_FILES
+/*********************************************************************
+ *
+ * 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 = NULL;
+ 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 = (struct http_response *)zalloc(sizeof(*rsp))))
+ {
+ return NULL;
+ }
+ exports = default_exports(csp, NULL);
+
+ /*
+ * 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);
+
+ 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);
+ }
+ else
+ {
+ exports = map(exports, "referrer", 1, "unknown", 1);
+ exports = map(exports, "referrer-html", 1, "unknown", 1);
+ }
- n = strlen(CBLOCK);
- n += factor * strlen(http->hostport);
- n += factor * strlen(http->path);
+ /*
+ * 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);
+ }
+ exports = map(exports, "trusted-referrers", 1, p, 0);
+ p = NULL;
- p = (char *)malloc(n);
+ /*
+ * Export the trust info, if available
+ */
+ if (csp->config->trust_info->next)
+ {
+ struct list *l;
+ for (l = csp->config->trust_info->next; l ; l = l->next)
+ {
+ sprintf(buf,
+ "<li> <a href=%s>%s</a><br>\n",
+ l->str, l->str);
+ p = strsav(p, buf);
+ }
+ exports = map(exports, "trust-info", 1, p, 0);
+ }
+ else
+ {
+ exports = map_block_killer(exports, "have-trust-info");
+ }
+
+ /*
+ * Export the force prefix or the force conditional block killer
+ */
#ifdef FORCE_LOAD
- sprintf(p, CBLOCK, http->hostport, http->path, http->hostport, http->path,
- http->hostport, http->path);
+ exports = map(exports, "force-prefix", 1, FORCE_PREFIX, 1);
#else
- sprintf(p, CBLOCK, http->hostport, http->path, http->hostport, http->path);
-#endif /* def FORCE_LOAD */
+ exports = map_block_killer(exports, "force-support");
+#endif /* ndef FORCE_LOAD */
+
+ /*
+ * Build the response
+ */
+ rsp->body = fill_template(csp, "untrusted", exports);
+ free_map(exports);
+
+ return(finish_http_response(rsp));
+
+}
+#endif /* def TRUST_FILES */
+
+
+#ifdef FAST_REDIRECTS
+/*********************************************************************
+ *
+ * Function : redirect_url
+ *
+ * Description : Checks for redirection URLs and returns a HTTP redirect
+ * to the destination URL, if necessary
+ *
+ * Parameters :
+ * 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;
- return(p);
+ 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 = zalloc(sizeof(*rsp))))
+ {
+ 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 FAST_REDIRECTS */
#ifdef IMAGE_BLOCKING
/*********************************************************************
*
- * Function : block_imageurl
- *
- * Description : Given a URL which is blocked, decide whether to
- * send the "blocked" image or HTML.
+ * 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.
+ *
* Parameters :
- * 1 : http = URL to check.
- * 2 : csp = Current client state (buffers, headers, etc...)
+ * 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
if ((csp->accept_types
#endif
return ((csp->action->flags & ACTION_IMAGE) != 0);
+
}
#endif /* def IMAGE_BLOCKING */
#ifdef TRUST_FILES
/*********************************************************************
*
- * Function : trust_url
+ * Function : is_untrusted_url
*
- * Description : Should we "trust" this URL? See "trustfile" line in config.
+ * Description : Should we "distrust" this URL (and block it)?
+ *
+ * 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 (((fl = csp->tlist) == NULL) || ((b = fl->f) == NULL))
{
- return(NULL);
+ return(0);
}
- *url = dsplit(http->host);
+ *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);
-
- 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);
+ if (b->reject == 0) return(0);
- 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);
-
*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);
-
}
#endif /* def TRUST_FILES */
*
* Function : re_process_buffer
*
- * 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 an empty string in case something went wrong
*
- *
*********************************************************************/
char *re_process_buffer(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;
return(strdup(""));
}
- joblist = b->joblist;
-
-
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;
}
*
* Description : Domain-wise Compare fqdn's. The comparison is
* both left- and right-anchored. The individual
- * domain names are compared with trivialmatch().
+ * domain names are compared with simplematch().
* This is only used by domaincmp.
*
* Parameters :
* 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.
projects / privoxy.git / commitdiff