public override bool Apply(Request httpRequest)
{
string referer;
string request;
if (httpRequest.Referer == null)
referer = "";
else
referer = new Uri (httpRequest.Referer).Host;
request = httpRequest.Uri.Host;
if (request == referer)
return false;
using (listLock.Read) {
foreach (RefererPair pair in watchlist) {
if (pair.MatchFrom (referer) == false)
continue;
if (pair.MatchTo (httpRequest.Dns.NameList) == false)
continue;
httpRequest.Flags.Set (pair.Flags);
if (pair.Flags ["block"]) {
httpRequest.SetTriggerHtml (Html.Format (@"
<h1 style=""text-align:center""><a href=""{0}"" style=""font-size: 3em;"">{1}</a></h1>
<p>Blocked by: {2} <a href=""{3}?delete={4}&return={5}"">delete</a></p>", httpRequest.Uri, httpRequest.Uri.Host, pair, Filters.WebUI.FilterUrl (this), pair.GetHashCode (), Uri.EscapeUriString (httpRequest.Uri.ToString ())));
return true;
}
httpRequest.SetTriggerHtml (Html.Escape (pair.ToString ()));
return true;
}
}
//Already blocked, don't add to blocked list
if (httpRequest.Flags ["block"])
return true;
using (listLock.UpgradeableRead) {
foreach (string h in httpRequest.Dns.NameList) {
RefererPair rp = new RefererPair (referer, h);
if (blocked.Contains (rp) == false) {
using (listLock.Write) {
blocked.Insert (0, rp);
}
}
}
}
//Allow empty referers
if (referer == "")
return false;
//Default action: none(pass)
return false;
//Default action: Remove
//httpRequest.Flags.Set ("remove");
//Default action: Block
/*
httpRequest.Flags.Set ("block");
httpRequest.SetTriggerHtml (Html.Format (@"
<h1 style=""text-align:center""><a href=""{0}"" style=""font-size: 3em;"">{1}</a></h1>
<p style=""text-align:center""><a href=""{0}"">{2}</a></p>", httpRequest.Uri, httpRequest.Uri.Host, httpRequest.Uri.PathAndQuery));
httpRequest.SetTriggerHtml (Form (referer, httpRequest.Uri.Host, httpRequest.Uri.ToString ()));
return true;
*/
}
public bool Match(RefererPair requestPair)
{
if (MatchStrings (FromHost, requestPair.FromHost) == false)
return false;
if (MatchStrings (ToHost, requestPair.ToHost) == false)
return false;
return true;
}
private Html Form(RefererPair pair)
{
return Form (pair.FromHost, pair.ToHost, null);
}
private Html Form(RefererPair pair, string returnUrl)
{
return Form (pair.FromHost, pair.ToHost, returnUrl);
}
public override Response Status(NameValueCollection httpGet, Request request)
{
Html html = new Html ();
if (httpGet ["delete"] != null) {
int item = int.Parse (httpGet ["delete"]);
using (listLock.Write) {
foreach (RefererPair rp in watchlist.ToArray ()) {
if (rp.GetHashCode () == item)
watchlist.Remove (rp);
}
}
SaveFilters ();
}
if (httpGet ["clear"] != null) {
using (listLock.Write) {
blocked.Clear ();
}
}
if (httpGet ["action"] != null || httpGet ["flags"] != null) {
RefererPair p = new RefererPair (httpGet ["from"], httpGet ["to"]);
p.Flags.Set (httpGet ["flags"]);
if (httpGet ["action"].Contains (" ") == false)
p.Flags.Set (httpGet ["action"]);
using (listLock.Write) {
watchlist.Add (p);
foreach (RefererPair bp in blocked.ToArray ()) {
if (p.Match (bp))
blocked.Remove (bp);
}
}
SaveFilters ();
}
if (httpGet ["return"] != null) {
Response resp = new Response (HttpStatusCode.Redirect, new Html ());
resp.ReplaceHeader ("Location", httpGet ["return"]);
return resp;
}
html += Html.Format (@"<h2>Blocked <a href=""?clear=yes"">clear</a></h2>");
html += Html.Format ("<table><tr><th>From Domain</th><th>To Domain</th><th>Flags</th></tr>");
html += Form ("", "");
using (listLock.Read) {
foreach (RefererPair pair in blocked) {
html += Form (pair);
}
html += Html.Format ("</table>");
html += Html.Format ("<h2>Watchlist</h2>");
html += Html.Format ("<table><tr><th>From Domain</th><th>To Domain</th><th>Flags</th><th>Delete</th></tr>");
foreach (RefererPair pair in watchlist) {
html += Html.Format ("<tr><td>{0}</td><td>{1}</td><td>{2}</td><td><a href=\"?delete={3}\">delete</a></td></tr>", pair.FromHost, pair.ToHost, pair.Flags, pair.GetHashCode ());
}
html += Html.Format ("</table>");
}
html += Html.Format (@"
<div>
<ul>
<li><strong>Pass</strong> Allow request to pass through unmodified</li>
<li><strong>Fake</strong> Change referer to the root of the target host</li>
<li><strong>Clean</strong> Change referer to the root of the source host</li>
<li><strong>Remove</strong> Remove the referer header</li>
<li><strong>Slow</strong> Do not modify the request but slow down the transfer speed</li>
<li><strong>Block</strong> Block the entire request</li>
</ul>
<p>From/To: Wildcard(*) allowed in start of domains, applies to subdomains only</p>
<p>Example: *example.com matches xyz.example.com and example.com but not badexample.com</p>
</div>");
return WebUI.ResponseTemplate (ToString (), html);
}
