516 lines
14 KiB
C#
516 lines
14 KiB
C#
#region License
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/*
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* EndPointListener.cs
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*
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* This code is derived from EndPointListener.cs (System.Net) of Mono
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* (http://www.mono-project.com).
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*
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* The MIT License
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*
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* Copyright (c) 2005 Novell, Inc. (http://www.novell.com)
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* Copyright (c) 2012-2016 sta.blockhead
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* 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, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#endregion
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#region Authors
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/*
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* Authors:
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* - Gonzalo Paniagua Javier <gonzalo@novell.com>
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*/
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#endregion
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#region Contributors
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/*
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* Contributors:
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* - Liryna <liryna.stark@gmail.com>
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* - Nicholas Devenish
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*/
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#endregion
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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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{
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internal sealed class EndPointListener
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{
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#region Private Fields
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private List<HttpListenerPrefix> _all; // host == '+'
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private static readonly string _defaultCertFolderPath;
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private IPEndPoint _endpoint;
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private Dictionary<HttpListenerPrefix, HttpListener> _prefixes;
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private bool _secure;
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private Socket _socket;
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private ServerSslConfiguration _sslConfig;
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private List<HttpListenerPrefix> _unhandled; // host == '*'
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private Dictionary<HttpConnection, HttpConnection> _unregistered;
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private object _unregisteredSync;
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#endregion
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#region Static Constructor
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static EndPointListener ()
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{
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_defaultCertFolderPath =
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Environment.GetFolderPath (Environment.SpecialFolder.ApplicationData);
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}
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#endregion
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#region Internal Constructors
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internal EndPointListener (
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IPEndPoint endpoint,
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bool secure,
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string certificateFolderPath,
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ServerSslConfiguration sslConfig,
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bool reuseAddress
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)
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{
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if (secure) {
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var cert =
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getCertificate (endpoint.Port, certificateFolderPath, sslConfig.ServerCertificate);
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if (cert == null)
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throw new ArgumentException ("No server certificate could be found.");
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_secure = true;
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_sslConfig = new ServerSslConfiguration (sslConfig);
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_sslConfig.ServerCertificate = cert;
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}
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_endpoint = endpoint;
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_prefixes = new Dictionary<HttpListenerPrefix, HttpListener> ();
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_unregistered = new Dictionary<HttpConnection, HttpConnection> ();
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_unregisteredSync = ((ICollection) _unregistered).SyncRoot;
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_socket =
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new Socket (endpoint.Address.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
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if (reuseAddress)
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_socket.SetSocketOption (SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
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_socket.Bind (endpoint);
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_socket.Listen (500);
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_socket.BeginAccept (onAccept, this);
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}
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#endregion
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#region Public Properties
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public IPAddress Address {
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get {
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return _endpoint.Address;
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}
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}
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public bool IsSecure {
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get {
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return _secure;
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}
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}
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public int Port {
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get {
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return _endpoint.Port;
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}
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}
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public ServerSslConfiguration SslConfiguration {
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get {
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return _sslConfig;
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}
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}
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#endregion
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#region Private Methods
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private static void addSpecial (List<HttpListenerPrefix> prefixes, HttpListenerPrefix prefix)
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{
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var path = prefix.Path;
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foreach (var pref in prefixes) {
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if (pref.Path == path)
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throw new HttpListenerException (87, "The prefix is already in use.");
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}
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prefixes.Add (prefix);
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}
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private static RSACryptoServiceProvider createRSAFromFile (string filename)
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{
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byte[] pvk = null;
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using (var fs = File.Open (filename, FileMode.Open, FileAccess.Read, FileShare.Read)) {
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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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var rsa = new RSACryptoServiceProvider ();
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rsa.ImportCspBlob (pvk);
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return rsa;
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}
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private static X509Certificate2 getCertificate (
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int port, string folderPath, X509Certificate2 defaultCertificate
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)
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{
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if (folderPath == null || folderPath.Length == 0)
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folderPath = _defaultCertFolderPath;
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try {
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var cer = Path.Combine (folderPath, String.Format ("{0}.cer", port));
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var key = Path.Combine (folderPath, String.Format ("{0}.key", port));
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if (File.Exists (cer) && File.Exists (key)) {
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var cert = new X509Certificate2 (cer);
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cert.PrivateKey = createRSAFromFile (key);
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return cert;
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}
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}
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catch {
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}
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return defaultCertificate;
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}
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private void leaveIfNoPrefix ()
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{
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if (_prefixes.Count > 0)
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return;
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var prefs = _unhandled;
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if (prefs != null && prefs.Count > 0)
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return;
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prefs = _all;
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if (prefs != null && prefs.Count > 0)
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return;
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EndPointManager.RemoveEndPoint (_endpoint);
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}
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private static void onAccept (IAsyncResult asyncResult)
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{
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var lsnr = (EndPointListener) asyncResult.AsyncState;
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Socket sock = null;
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try {
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sock = lsnr._socket.EndAccept (asyncResult);
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}
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catch (SocketException) {
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// TODO: Should log the error code when this class has a logging.
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}
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catch (ObjectDisposedException) {
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return;
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}
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try {
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lsnr._socket.BeginAccept (onAccept, lsnr);
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}
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catch {
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if (sock != null)
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sock.Close ();
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return;
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}
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if (sock == null)
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return;
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processAccepted (sock, lsnr);
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}
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private static void processAccepted (Socket socket, EndPointListener listener)
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{
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HttpConnection conn = null;
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try {
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conn = new HttpConnection (socket, listener);
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lock (listener._unregisteredSync)
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listener._unregistered[conn] = conn;
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conn.BeginReadRequest ();
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}
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catch {
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if (conn != null) {
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conn.Close (true);
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return;
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}
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socket.Close ();
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}
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}
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private static bool removeSpecial (List<HttpListenerPrefix> prefixes, HttpListenerPrefix prefix)
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{
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var path = prefix.Path;
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var cnt = prefixes.Count;
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for (var i = 0; i < cnt; i++) {
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if (prefixes[i].Path == path) {
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prefixes.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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private static HttpListener searchHttpListenerFromSpecial (
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string path, List<HttpListenerPrefix> prefixes
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)
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{
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if (prefixes == null)
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return null;
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HttpListener bestMatch = null;
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var bestLen = -1;
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foreach (var pref in prefixes) {
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var prefPath = pref.Path;
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var len = prefPath.Length;
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if (len < bestLen)
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continue;
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if (path.StartsWith (prefPath)) {
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bestLen = len;
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bestMatch = pref.Listener;
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}
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}
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return bestMatch;
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}
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#endregion
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#region Internal Methods
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internal static bool CertificateExists (int port, string folderPath)
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{
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if (folderPath == null || folderPath.Length == 0)
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folderPath = _defaultCertFolderPath;
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var cer = Path.Combine (folderPath, String.Format ("{0}.cer", port));
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var key = Path.Combine (folderPath, String.Format ("{0}.key", port));
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return File.Exists (cer) && File.Exists (key);
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}
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internal void RemoveConnection (HttpConnection connection)
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{
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lock (_unregisteredSync)
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_unregistered.Remove (connection);
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}
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internal bool TrySearchHttpListener (Uri uri, out HttpListener listener)
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{
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listener = null;
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if (uri == null)
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return false;
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var host = uri.Host;
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var dns = Uri.CheckHostName (host) == UriHostNameType.Dns;
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var port = uri.Port.ToString ();
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var path = HttpUtility.UrlDecode (uri.AbsolutePath);
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var pathSlash = path[path.Length - 1] != '/' ? path + "/" : path;
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if (host != null && host.Length > 0) {
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var bestLen = -1;
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foreach (var pref in _prefixes.Keys) {
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if (dns) {
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var prefHost = pref.Host;
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if (Uri.CheckHostName (prefHost) == UriHostNameType.Dns && prefHost != host)
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continue;
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}
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if (pref.Port != port)
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continue;
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var prefPath = pref.Path;
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var len = prefPath.Length;
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if (len < bestLen)
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continue;
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if (path.StartsWith (prefPath) || pathSlash.StartsWith (prefPath)) {
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bestLen = len;
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listener = _prefixes[pref];
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}
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}
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if (bestLen != -1)
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return true;
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}
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var prefs = _unhandled;
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listener = searchHttpListenerFromSpecial (path, prefs);
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if (listener == null && pathSlash != path)
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listener = searchHttpListenerFromSpecial (pathSlash, prefs);
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if (listener != null)
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return true;
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prefs = _all;
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listener = searchHttpListenerFromSpecial (path, prefs);
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if (listener == null && pathSlash != path)
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listener = searchHttpListenerFromSpecial (pathSlash, prefs);
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return listener != null;
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}
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#endregion
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#region Public Methods
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public void AddPrefix (HttpListenerPrefix prefix, HttpListener listener)
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{
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List<HttpListenerPrefix> current, 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<HttpListenerPrefix> (current)
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: new List<HttpListenerPrefix> ();
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prefix.Listener = listener;
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addSpecial (future, prefix);
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}
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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<HttpListenerPrefix> (current)
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: new List<HttpListenerPrefix> ();
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prefix.Listener = listener;
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addSpecial (future, prefix);
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}
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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<HttpListenerPrefix, HttpListener> prefs, prefs2;
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do {
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prefs = _prefixes;
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if (prefs.ContainsKey (prefix)) {
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if (prefs[prefix] != listener) {
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throw new HttpListenerException (
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87, String.Format ("There's another listener for {0}.", prefix)
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);
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}
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return;
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}
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prefs2 = new Dictionary<HttpListenerPrefix, HttpListener> (prefs);
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prefs2[prefix] = listener;
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}
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while (Interlocked.CompareExchange (ref _prefixes, prefs2, prefs) != prefs);
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}
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public void Close ()
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{
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_socket.Close ();
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HttpConnection[] conns = null;
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lock (_unregisteredSync) {
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if (_unregistered.Count == 0)
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return;
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var keys = _unregistered.Keys;
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conns = new HttpConnection[keys.Count];
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keys.CopyTo (conns, 0);
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_unregistered.Clear ();
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}
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for (var i = conns.Length - 1; i >= 0; i--)
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conns[i].Close (true);
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}
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public void RemovePrefix (HttpListenerPrefix prefix, HttpListener listener)
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{
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List<HttpListenerPrefix> current, future;
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if (prefix.Host == "*") {
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do {
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current = _unhandled;
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if (current == null)
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break;
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future = new List<HttpListenerPrefix> (current);
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if (!removeSpecial (future, prefix))
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break; // The prefix wasn't found.
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}
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while (Interlocked.CompareExchange (ref _unhandled, future, current) != current);
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leaveIfNoPrefix ();
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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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if (current == null)
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break;
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future = new List<HttpListenerPrefix> (current);
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if (!removeSpecial (future, prefix))
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break; // The prefix wasn't found.
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}
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while (Interlocked.CompareExchange (ref _all, future, current) != current);
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leaveIfNoPrefix ();
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return;
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}
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Dictionary<HttpListenerPrefix, HttpListener> prefs, prefs2;
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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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prefs2 = new Dictionary<HttpListenerPrefix, HttpListener> (prefs);
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prefs2.Remove (prefix);
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}
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while (Interlocked.CompareExchange (ref _prefixes, prefs2, prefs) != prefs);
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leaveIfNoPrefix ();
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}
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#endregion
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}
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}
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