From 6f3fa9135b34e14c5330cb563b136e915d91ecf9 Mon Sep 17 00:00:00 2001
From: corvid <corvid@lavabit.com>
Date: Tue, 6 Apr 2010 02:27:54 +0000
Subject: filter automatic requests

same_domain option in preference so that spying on users isn't so easy.
---
 src/capi.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)

(limited to 'src/capi.c')

diff --git a/src/capi.c b/src/capi.c
index 987efc3d..cbabbeae 100644
--- a/src/capi.c
+++ b/src/capi.c
@@ -353,6 +353,61 @@ static void Capi_dpi_send_source(BrowserWindow *bw,  DilloUrl *url)
    dFree(cmd);
 }
 
+/*
+ * When dillo wants to open an URL, this can be either due to user action
+ * (e.g., typing in an URL, clicking a link), or automatic (HTTP header
+ * indicates redirection, META HTML tag with refresh attribute and 0 delay,
+ * and images and stylesheets on an HTML page when autoloading is enabled).
+ *
+ * For a user request, the action will be permitted.
+ * For an automatic request, permission to load depends on the filter set
+ * by the user.
+ */ 
+static bool_t Capi_filters_allow(const DilloUrl *wanted,
+                                 const DilloUrl *requester)
+{
+   bool_t ret;
+
+   if (requester == NULL) {
+      /* request made by user */
+      ret = TRUE;
+   } else {
+      switch (prefs.filter_auto_requests) {
+         case PREFS_FILTER_SAME_DOMAIN:
+         {
+            const char *req_host = URL_HOST(requester),
+                       *want_host = URL_HOST(wanted),
+                       *req_suffix,
+                       *want_suffix;
+            if (!req_host && !want_host) {
+               ret = TRUE;
+            } else if (!req_host || !want_host) {
+               ret = FALSE;
+            } else {
+               /* This will regard "www.dillo.org" and "www.dillo.org." as
+                * different, but it doesn't seem worth caring about.
+                */
+               req_suffix = a_Url_host_find_public_suffix(req_host);
+               want_suffix = a_Url_host_find_public_suffix(want_host);
+
+               ret = dStrcasecmp(req_suffix, want_suffix) == 0;
+            }
+
+            if (ret)
+               MSG("ALLOW\n");
+            else
+               MSG("DENY\n");
+            break;
+         }
+         case PREFS_FILTER_ALLOW_ALL:
+         default:
+            ret = TRUE;
+            break;
+      }
+   }
+   return ret;
+}
+
 /*
  * Most used function for requesting a URL.
  * TODO: clean up the ad-hoc bindings with an API that allows dynamic
@@ -369,6 +424,9 @@ int a_Capi_open_url(DilloWeb *web, CA_Callback_t Call, void *CbData)
    const char *scheme = URL_SCHEME(web->url);
    int safe = 0, ret = 0, use_cache = 0;
 
+   dReturn_val_if_fail((a_Capi_get_flags(web->url) & CAPI_IsCached) ||
+                       Capi_filters_allow(web->url, web->requester), 0);
+
    /* reload test */
    reload = (!(a_Capi_get_flags(web->url) & CAPI_IsCached) ||
              (URL_FLAGS(web->url) & URL_E2EQuery));
-- 
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