//
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// EndPointListener.cs
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// Copied from System.Net.EndPointListener
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//
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// Author:
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// Gonzalo Paniagua Javier (gonzalo@novell.com)
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//
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// Copyright (c) 2005 Novell, Inc. (http://www.novell.com)
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// Copyright (c) 2012 sta.blockhead (sta.blockhead@gmail.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.IO;
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using System.Net;
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using System.Net.Sockets;
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using System.Security.Cryptography;
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using System.Security.Cryptography.X509Certificates;
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using System.Threading;
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namespace WebSocketSharp.Net {
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sealed class EndPointListener {
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#region Fields
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List<ListenerPrefix> all; // host = '+'
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X509Certificate2 cert;
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IPEndPoint endpoint;
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AsymmetricAlgorithm key;
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Dictionary<ListenerPrefix, HttpListener> prefixes;
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bool secure;
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Socket sock;
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List<ListenerPrefix> unhandled; // host = '*'
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Hashtable unregistered;
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#endregion
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#region Constructor
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public EndPointListener (IPAddress addr, int port, bool secure)
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{
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if (secure) {
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this.secure = secure;
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LoadCertificateAndKey (addr, port);
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}
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endpoint = new IPEndPoint (addr, port);
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sock = new Socket (addr.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
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sock.Bind (endpoint);
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sock.Listen (500);
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var args = new SocketAsyncEventArgs ();
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args.UserToken = this;
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args.Completed += OnAccept;
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sock.AcceptAsync (args);
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prefixes = new Dictionary<ListenerPrefix, HttpListener> ();
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unregistered = Hashtable.Synchronized (new Hashtable ());
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}
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#endregion
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#region Private Methods
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void AddSpecial (List<ListenerPrefix> coll, ListenerPrefix prefix)
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{
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if (coll == null)
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return;
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foreach (ListenerPrefix p in coll) {
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if (p.Path == prefix.Path) // TODO: code
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throw new HttpListenerException (400, "Prefix already in use.");
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}
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coll.Add (prefix);
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}
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void CheckIfRemove ()
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{
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if (prefixes.Count > 0)
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return;
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var list = unhandled;
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if (list != null && list.Count > 0)
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return;
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list = all;
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if (list != null && list.Count > 0)
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return;
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EndPointManager.RemoveEndPoint (this, endpoint);
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}
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RSACryptoServiceProvider CreateRSAFromFile (string filename)
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{
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if (filename == null)
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throw new ArgumentNullException ("filename");
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var rsa = new RSACryptoServiceProvider ();
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byte[] pvk = null;
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using (FileStream fs = File.Open (filename, FileMode.Open, FileAccess.Read, FileShare.Read))
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{
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pvk = new byte [fs.Length];
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fs.Read (pvk, 0, pvk.Length);
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}
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rsa.ImportCspBlob (pvk);
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return rsa;
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}
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void LoadCertificateAndKey (IPAddress addr, int port)
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{
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// Actually load the certificate
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try {
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string dirname = Environment.GetFolderPath (Environment.SpecialFolder.ApplicationData);
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string path = Path.Combine (dirname, ".mono");
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path = Path.Combine (path, "httplistener");
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string cert_file = Path.Combine (path, String.Format ("{0}.cer", port));
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string pvk_file = Path.Combine (path, String.Format ("{0}.pvk", port));
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cert = new X509Certificate2 (cert_file);
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key = CreateRSAFromFile (pvk_file);
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} catch {
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// ignore errors
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}
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}
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HttpListener MatchFromList (
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string host, string path, List<ListenerPrefix> list, out ListenerPrefix prefix)
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{
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prefix = null;
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if (list == null)
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return null;
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HttpListener best_match = null;
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int best_length = -1;
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foreach (ListenerPrefix p in list) {
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string ppath = p.Path;
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if (ppath.Length < best_length)
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continue;
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if (path.StartsWith (ppath)) {
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best_length = ppath.Length;
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best_match = p.Listener;
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prefix = p;
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}
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}
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return best_match;
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}
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static void OnAccept (object sender, EventArgs e)
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{
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SocketAsyncEventArgs args = (SocketAsyncEventArgs) e;
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EndPointListener epl = (EndPointListener) args.UserToken;
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Socket accepted = null;
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if (args.SocketError == SocketError.Success) {
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accepted = args.AcceptSocket;
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args.AcceptSocket = null;
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}
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try {
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if (epl.sock != null)
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epl.sock.AcceptAsync (args);
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} catch {
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if (accepted != null) {
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try {
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accepted.Close ();
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} catch {}
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accepted = null;
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}
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}
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if (accepted == null)
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return;
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if (epl.secure && (epl.cert == null || epl.key == null)) {
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accepted.Close ();
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return;
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}
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HttpConnection conn = new HttpConnection (accepted, epl, epl.secure, epl.cert, epl.key);
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epl.unregistered [conn] = conn;
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conn.BeginReadRequest ();
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}
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bool RemoveSpecial (List<ListenerPrefix> coll, ListenerPrefix prefix)
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{
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if (coll == null)
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return false;
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int c = coll.Count;
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for (int i = 0; i < c; i++) {
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ListenerPrefix p = coll [i];
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if (p.Path == prefix.Path) {
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coll.RemoveAt (i);
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return true;
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}
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}
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return false;
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}
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HttpListener SearchListener (Uri uri, out ListenerPrefix prefix)
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{
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prefix = null;
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if (uri == null)
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return null;
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string host = uri.Host;
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int port = uri.Port;
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string path = HttpUtility.UrlDecode (uri.AbsolutePath);
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string path_slash = path [path.Length - 1] == '/' ? path : path + "/";
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HttpListener best_match = null;
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int best_length = -1;
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if (host != null && host != "") {
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var p_ro = prefixes;
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foreach (ListenerPrefix p in p_ro.Keys) {
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string ppath = p.Path;
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if (ppath.Length < best_length)
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continue;
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if (p.Host != host || p.Port != port)
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continue;
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if (path.StartsWith (ppath) || path_slash.StartsWith (ppath)) {
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best_length = ppath.Length;
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best_match = p_ro [p];
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prefix = p;
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}
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}
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if (best_length != -1)
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return best_match;
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}
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var list = unhandled;
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best_match = MatchFromList (host, path, list, out prefix);
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if (path != path_slash && best_match == null)
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best_match = MatchFromList (host, path_slash, list, out prefix);
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if (best_match != null)
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return best_match;
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list = all;
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best_match = MatchFromList (host, path, list, out prefix);
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if (path != path_slash && best_match == null)
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best_match = MatchFromList (host, path_slash, list, out prefix);
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if (best_match != null)
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return best_match;
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return null;
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}
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#endregion
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#region Internal Method
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internal void RemoveConnection (HttpConnection conn)
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{
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unregistered.Remove (conn);
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}
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#endregion
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#region Public Methods
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public void AddPrefix (ListenerPrefix prefix, HttpListener listener)
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{
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List<ListenerPrefix> current;
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List<ListenerPrefix> future;
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if (prefix.Host == "*") {
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do {
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current = unhandled;
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future = (current != null)
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? new List<ListenerPrefix> (current)
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: new List<ListenerPrefix> ();
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prefix.Listener = listener;
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AddSpecial (future, prefix);
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} while (Interlocked.CompareExchange (ref unhandled, future, current) != current);
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return;
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}
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if (prefix.Host == "+") {
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do {
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current = all;
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future = (current != null)
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? new List<ListenerPrefix> (current)
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: new List<ListenerPrefix> ();
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prefix.Listener = listener;
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AddSpecial (future, prefix);
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} while (Interlocked.CompareExchange (ref all, future, current) != current);
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return;
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}
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Dictionary<ListenerPrefix, HttpListener> prefs, p2;
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do {
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prefs = prefixes;
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if (prefs.ContainsKey (prefix)) {
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HttpListener other = prefs [prefix];
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if (other != listener) // TODO: code.
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throw new HttpListenerException (400, "There's another listener for " + prefix);
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return;
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}
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p2 = new Dictionary<ListenerPrefix, HttpListener> (prefs);
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p2 [prefix] = listener;
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} while (Interlocked.CompareExchange (ref prefixes, p2, prefs) != prefs);
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}
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public bool BindContext (HttpListenerContext context)
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{
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HttpListenerRequest req = context.Request;
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ListenerPrefix prefix;
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HttpListener listener = SearchListener (req.Url, out prefix);
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if (listener == null)
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return false;
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context.Listener = listener;
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context.Connection.Prefix = prefix;
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return true;
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}
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public void Close ()
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{
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sock.Close ();
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lock (unregistered.SyncRoot) {
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Hashtable copy = (Hashtable) unregistered.Clone ();
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foreach (HttpConnection c in copy.Keys)
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c.Close (true);
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copy.Clear ();
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unregistered.Clear ();
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}
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}
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public void RemovePrefix (ListenerPrefix prefix, HttpListener listener)
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{
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List<ListenerPrefix> current;
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List<ListenerPrefix> future;
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if (prefix.Host == "*") {
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do {
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current = unhandled;
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future = (current != null)
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? new List<ListenerPrefix> (current)
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: new List<ListenerPrefix> ();
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if (!RemoveSpecial (future, prefix))
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break; // Prefix not found
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} while (Interlocked.CompareExchange (ref unhandled, future, current) != current);
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CheckIfRemove ();
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return;
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}
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if (prefix.Host == "+") {
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do {
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current = all;
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future = (current != null)
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? new List<ListenerPrefix> (current)
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: new List<ListenerPrefix> ();
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if (!RemoveSpecial (future, prefix))
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break; // Prefix not found
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} while (Interlocked.CompareExchange (ref all, future, current) != current);
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CheckIfRemove ();
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return;
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}
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Dictionary<ListenerPrefix, HttpListener> prefs, p2;
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do {
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prefs = prefixes;
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if (!prefs.ContainsKey (prefix))
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break;
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p2 = new Dictionary<ListenerPrefix, HttpListener> (prefs);
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p2.Remove (prefix);
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} while (Interlocked.CompareExchange (ref prefixes, p2, prefs) != prefs);
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CheckIfRemove ();
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}
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public void UnbindContext (HttpListenerContext context)
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{
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if (context == null || context.Request == null)
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return;
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context.Listener.UnregisterContext (context);
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}
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#endregion
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}
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}
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