websocket-sharp/websocket-sharp/Server/WebSocketServer.cs

835 lines
26 KiB
C#

#region License
/*
* WebSocketServer.cs
*
* A C# implementation of the WebSocket protocol server.
*
* The MIT License
*
* Copyright (c) 2012-2014 sta.blockhead
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#endregion
#region Contributors
/*
* Contributors:
* Juan Manuel Lallana <juan.manuel.lallana@gmail.com>
*/
#endregion
using System;
using System.Collections.Generic;
using System.Net.Sockets;
using System.Security.Cryptography.X509Certificates;
using System.Security.Principal;
using System.Text;
using System.Threading;
using WebSocketSharp.Net;
using WebSocketSharp.Net.WebSockets;
namespace WebSocketSharp.Server
{
/// <summary>
/// Provides a WebSocket protocol server.
/// </summary>
/// <remarks>
/// The WebSocketServer class provides the multi WebSocket service.
/// </remarks>
public class WebSocketServer
{
#region Private Fields
private System.Net.IPAddress _address;
private AuthenticationSchemes _authSchemes;
private X509Certificate2 _cert;
private Func<IIdentity, NetworkCredential> _credentialsFinder;
private TcpListener _listener;
private Logger _logger;
private int _port;
private string _realm;
private Thread _receiveRequestThread;
private bool _secure;
private WebSocketServiceManager _services;
private volatile ServerState _state;
private object _sync;
private Uri _uri;
#endregion
#region Public Constructors
/// <summary>
/// Initializes a new instance of the <see cref="WebSocketServer"/> class.
/// </summary>
/// <remarks>
/// An instance initialized by this constructor listens for the incoming connection requests on
/// port 80.
/// </remarks>
public WebSocketServer ()
: this (80)
{
}
/// <summary>
/// Initializes a new instance of the <see cref="WebSocketServer"/> class with the specified
/// <paramref name="port"/>.
/// </summary>
/// <remarks>
/// <para>
/// An instance initialized by this constructor listens for the incoming connection requests
/// on <paramref name="port"/>.
/// </para>
/// <para>
/// And if <paramref name="port"/> is 443, that instance provides a secure connection.
/// </para>
/// </remarks>
/// <param name="port">
/// An <see cref="int"/> that represents the port number on which to listen.
/// </param>
/// <exception cref="ArgumentOutOfRangeException">
/// <paramref name="port"/> isn't between 1 and 65535.
/// </exception>
public WebSocketServer (int port)
: this (System.Net.IPAddress.Any, port)
{
}
/// <summary>
/// Initializes a new instance of the <see cref="WebSocketServer"/> class with the specified
/// WebSocket URL.
/// </summary>
/// <remarks>
/// <para>
/// An instance initialized by this constructor listens for the incoming connection requests
/// on the port (if any) in <paramref name="url"/>.
/// </para>
/// <para>
/// So if <paramref name="url"/> is without a port, either port 80 or 443 is used on which to
/// listen. It's determined by the scheme (ws or wss) in <paramref name="url"/>. (port 80 if
/// the scheme is ws.)
/// </para>
/// </remarks>
/// <param name="url">
/// A <see cref="string"/> that represents the WebSocket URL of the server.
/// </param>
/// <exception cref="ArgumentNullException">
/// <paramref name="url"/> is <see langword="null"/>.
/// </exception>
/// <exception cref="ArgumentException">
/// <paramref name="url"/> is invalid.
/// </exception>
public WebSocketServer (string url)
{
if (url == null)
throw new ArgumentNullException ("url");
string msg;
if (!tryCreateUri (url, out _uri, out msg))
throw new ArgumentException (msg, "url");
var host = _uri.DnsSafeHost;
_address = host.ToIPAddress ();
if (_address == null || !_address.IsLocal ())
throw new ArgumentException ("The host part must be the local host name: " + host, "url");
_port = _uri.Port;
_secure = _uri.Scheme == "wss";
init ();
}
/// <summary>
/// Initializes a new instance of the <see cref="WebSocketServer"/> class with the specified
/// <paramref name="port"/> and <paramref name="secure"/>.
/// </summary>
/// <remarks>
/// An instance initialized by this constructor listens for the incoming connection requests on
/// <paramref name="port"/>.
/// </remarks>
/// <param name="port">
/// An <see cref="int"/> that represents the port number on which to listen.
/// </param>
/// <param name="secure">
/// A <see cref="bool"/> that indicates providing a secure connection or not. (<c>true</c>
/// indicates providing a secure connection.)
/// </param>
/// <exception cref="ArgumentOutOfRangeException">
/// <paramref name="port"/> isn't between 1 and 65535.
/// </exception>
/// <exception cref="ArgumentException">
/// Pair of <paramref name="port"/> and <paramref name="secure"/> is invalid.
/// </exception>
public WebSocketServer (int port, bool secure)
: this (System.Net.IPAddress.Any, port, secure)
{
}
/// <summary>
/// Initializes a new instance of the <see cref="WebSocketServer"/> class with the specified
/// <paramref name="address"/> and <paramref name="port"/>.
/// </summary>
/// <remarks>
/// <para>
/// An instance initialized by this constructor listens for the incoming connection requests
/// on <paramref name="port"/>.
/// </para>
/// <para>
/// And if <paramref name="port"/> is 443, that instance provides a secure connection.
/// </para>
/// </remarks>
/// <param name="address">
/// A <see cref="System.Net.IPAddress"/> that represents the local IP address of the server.
/// </param>
/// <param name="port">
/// An <see cref="int"/> that represents the port number on which to listen.
/// </param>
/// <exception cref="ArgumentNullException">
/// <paramref name="address"/> is <see langword="null"/>.
/// </exception>
/// <exception cref="ArgumentOutOfRangeException">
/// <paramref name="port"/> isn't between 1 and 65535.
/// </exception>
/// <exception cref="ArgumentException">
/// <paramref name="address"/> isn't a local IP address.
/// </exception>
public WebSocketServer (System.Net.IPAddress address, int port)
: this (address, port, port == 443)
{
}
/// <summary>
/// Initializes a new instance of the <see cref="WebSocketServer"/> class with the specified
/// <paramref name="address"/>, <paramref name="port"/>, and <paramref name="secure"/>.
/// </summary>
/// <remarks>
/// An instance initialized by this constructor listens for the incoming connection requests on
/// <paramref name="port"/>.
/// </remarks>
/// <param name="address">
/// A <see cref="System.Net.IPAddress"/> that represents the local IP address of the server.
/// </param>
/// <param name="port">
/// An <see cref="int"/> that represents the port number on which to listen.
/// </param>
/// <param name="secure">
/// A <see cref="bool"/> that indicates providing a secure connection or not. (<c>true</c>
/// indicates providing a secure connection.)
/// </param>
/// <exception cref="ArgumentNullException">
/// <paramref name="address"/> is <see langword="null"/>.
/// </exception>
/// <exception cref="ArgumentOutOfRangeException">
/// <paramref name="port"/> isn't between 1 and 65535.
/// </exception>
/// <exception cref="ArgumentException">
/// <para>
/// <paramref name="address"/> isn't a local IP address.
/// </para>
/// <para>
/// -or-
/// </para>
/// <para>
/// Pair of <paramref name="port"/> and <paramref name="secure"/> is invalid.
/// </para>
/// </exception>
public WebSocketServer (System.Net.IPAddress address, int port, bool secure)
{
if (!address.IsLocal ())
throw new ArgumentException ("Must be the local IP address: " + address, "address");
if (!port.IsPortNumber ())
throw new ArgumentOutOfRangeException ("port", "Must be between 1 and 65535: " + port);
if ((port == 80 && secure) || (port == 443 && !secure))
throw new ArgumentException (
String.Format ("Invalid pair of 'port' and 'secure': {0}, {1}", port, secure));
_address = address;
_port = port;
_secure = secure;
_uri = "/".ToUri ();
init ();
}
#endregion
#region Public Properties
/// <summary>
/// Gets the local IP address of the server.
/// </summary>
/// <value>
/// A <see cref="System.Net.IPAddress"/> that represents the local IP address of the server.
/// </value>
public System.Net.IPAddress Address {
get {
return _address;
}
}
/// <summary>
/// Gets or sets the scheme used to authenticate the clients.
/// </summary>
/// <value>
/// One of the <see cref="WebSocketSharp.Net.AuthenticationSchemes"/> enum values, indicates
/// the scheme used to authenticate the clients.
/// The default value is <see cref="WebSocketSharp.Net.AuthenticationSchemes.Anonymous"/>.
/// </value>
public AuthenticationSchemes AuthenticationSchemes {
get {
return _authSchemes;
}
set {
if (!canSet ("AuthenticationSchemes"))
return;
_authSchemes = value;
}
}
/// <summary>
/// Gets or sets the certificate used to authenticate the server on the secure connection.
/// </summary>
/// <value>
/// A <see cref="X509Certificate2"/> used to authenticate the server.
/// </value>
public X509Certificate2 Certificate {
get {
return _cert;
}
set {
if (!canSet ("Certificate"))
return;
_cert = value;
}
}
/// <summary>
/// Gets a value indicating whether the server has started.
/// </summary>
/// <value>
/// <c>true</c> if the server has started; otherwise, <c>false</c>.
/// </value>
public bool IsListening {
get {
return _state == ServerState.Start;
}
}
/// <summary>
/// Gets a value indicating whether the server provides a secure connection.
/// </summary>
/// <value>
/// <c>true</c> if the server provides a secure connection; otherwise, <c>false</c>.
/// </value>
public bool IsSecure {
get {
return _secure;
}
}
/// <summary>
/// Gets or sets a value indicating whether the server cleans up the inactive sessions
/// periodically.
/// </summary>
/// <value>
/// <c>true</c> if the server cleans up the inactive sessions every 60 seconds; otherwise,
/// <c>false</c>. The default value is <c>true</c>.
/// </value>
public bool KeepClean {
get {
return _services.KeepClean;
}
set {
_services.KeepClean = value;
}
}
/// <summary>
/// Gets the logging functions.
/// </summary>
/// <remarks>
/// The default logging level is <see cref="LogLevel.Error"/>. If you would like to change it,
/// you should set the <c>Log.Level</c> property to any of the <see cref="LogLevel"/> enum
/// values.
/// </remarks>
/// <value>
/// A <see cref="Logger"/> that provides the logging functions.
/// </value>
public Logger Log {
get {
return _logger;
}
}
/// <summary>
/// Gets the port on which to listen for incoming connection requests.
/// </summary>
/// <value>
/// An <see cref="int"/> that represents the port number on which to listen.
/// </value>
public int Port {
get {
return _port;
}
}
/// <summary>
/// Gets or sets the name of the realm associated with the server.
/// </summary>
/// <value>
/// A <see cref="string"/> that represents the name of the realm. The default value is
/// <c>SECRET AREA</c>.
/// </value>
public string Realm {
get {
return _realm ?? (_realm = "SECRET AREA");
}
set {
if (!canSet ("Realm"))
return;
_realm = value;
}
}
/// <summary>
/// Gets or sets the delegate called to find the credentials for an identity used to
/// authenticate a client.
/// </summary>
/// <value>
/// A Func&lt;<see cref="IIdentity"/>, <see cref="NetworkCredential"/>&gt; delegate that
/// references the method(s) used to find the credentials. The default value is a function
/// that only returns <see langword="null"/>.
/// </value>
public Func<IIdentity, NetworkCredential> UserCredentialsFinder {
get {
return _credentialsFinder ?? (_credentialsFinder = identity => null);
}
set {
if (!canSet ("UserCredentialsFinder"))
return;
_credentialsFinder = value;
}
}
/// <summary>
/// Gets the access to the WebSocket services provided by the server.
/// </summary>
/// <value>
/// A <see cref="WebSocketServiceManager"/> that manages the WebSocket services.
/// </value>
public WebSocketServiceManager WebSocketServices {
get {
return _services;
}
}
#endregion
#region Private Methods
private void abort ()
{
lock (_sync) {
if (!IsListening)
return;
_state = ServerState.ShuttingDown;
}
_listener.Stop ();
_services.Stop (
((ushort) CloseStatusCode.ServerError).ToByteArrayInternally (ByteOrder.Big), true);
_state = ServerState.Stop;
}
private void acceptRequestAsync (TcpClient client)
{
ThreadPool.QueueUserWorkItem (
state => {
try {
var context = client.GetWebSocketContext (_cert, _secure, _logger);
if (_authSchemes != AuthenticationSchemes.Anonymous &&
!authenticateRequest (_authSchemes, context))
return;
acceptWebSocket (context);
}
catch (Exception ex) {
_logger.Fatal (ex.ToString ());
client.Close ();
}
});
}
private void acceptWebSocket (TcpListenerWebSocketContext context)
{
var path = context.Path;
WebSocketServiceHost host;
if (path == null || !_services.TryGetServiceHostInternally (path, out host)) {
context.Close (HttpStatusCode.NotImplemented);
return;
}
if (_uri.IsAbsoluteUri)
context.WebSocket.Url = new Uri (_uri, path);
host.StartSession (context);
}
private bool authenticateRequest (
AuthenticationSchemes scheme, TcpListenerWebSocketContext context)
{
var challenge = scheme == AuthenticationSchemes.Basic
? HttpUtility.CreateBasicAuthChallenge (Realm)
: scheme == AuthenticationSchemes.Digest
? HttpUtility.CreateDigestAuthChallenge (Realm)
: null;
if (challenge == null) {
context.Close (HttpStatusCode.Forbidden);
return false;
}
var retry = -1;
var expected = scheme.ToString ();
var realm = Realm;
var credentialsFinder = UserCredentialsFinder;
Func<bool> auth = null;
auth = () => {
retry++;
if (retry > 99) {
context.Close (HttpStatusCode.Forbidden);
return false;
}
var header = context.Headers ["Authorization"];
if (header == null || !header.StartsWith (expected, StringComparison.OrdinalIgnoreCase)) {
context.SendAuthChallenge (challenge);
return auth ();
}
context.SetUser (scheme, realm, credentialsFinder);
if (context.IsAuthenticated)
return true;
context.SendAuthChallenge (challenge);
return auth ();
};
return auth ();
}
private bool canSet (string property)
{
if (_state == ServerState.Start || _state == ServerState.ShuttingDown) {
_logger.Error (
String.Format (
"Set operation of {0} isn't available because the server has already started.",
property));
return false;
}
return true;
}
private string checkIfCertExists ()
{
return _secure && _cert == null
? "The secure connection requires a server certificate."
: null;
}
private void init ()
{
_authSchemes = AuthenticationSchemes.Anonymous;
_listener = new TcpListener (_address, _port);
_logger = new Logger ();
_services = new WebSocketServiceManager (_logger);
_state = ServerState.Ready;
_sync = new object ();
}
private void receiveRequest ()
{
while (true) {
try {
acceptRequestAsync (_listener.AcceptTcpClient ());
}
catch (SocketException ex) {
_logger.Warn ("Receiving has been stopped.\nreason: " + ex.Message);
break;
}
catch (Exception ex) {
_logger.Fatal (ex.ToString ());
break;
}
}
if (IsListening)
abort ();
}
private void startReceiving ()
{
_receiveRequestThread = new Thread (new ThreadStart (receiveRequest));
_receiveRequestThread.IsBackground = true;
_receiveRequestThread.Start ();
}
private void stopListener (int millisecondsTimeout)
{
_listener.Stop ();
_receiveRequestThread.Join (millisecondsTimeout);
}
private static bool tryCreateUri (string uriString, out Uri result, out string message)
{
if (!uriString.TryCreateWebSocketUri (out result, out message))
return false;
if (result.PathAndQuery != "/") {
result = null;
message = "Must not contain the path or query component: " + uriString;
return false;
}
return true;
}
#endregion
#region Public Methods
/// <summary>
/// Adds the specified typed WebSocket service with the specified <paramref name="path"/>.
/// </summary>
/// <remarks>
/// This method converts <paramref name="path"/> to URL-decoded string and removes <c>'/'</c>
/// from tail end of <paramref name="path"/>.
/// </remarks>
/// <param name="path">
/// A <see cref="string"/> that represents the absolute path to the WebSocket service to add.
/// </param>
/// <typeparam name="TWithNew">
/// The type of the WebSocket service.
/// The TWithNew must inherit the <see cref="WebSocketService"/> class and must have a public
/// parameterless constructor.
/// </typeparam>
public void AddWebSocketService<TWithNew> (string path)
where TWithNew : WebSocketService, new ()
{
AddWebSocketService<TWithNew> (path, () => new TWithNew ());
}
/// <summary>
/// Adds the specified typed WebSocket service with the specified <paramref name="path"/>
/// and <paramref name="constructor"/>.
/// </summary>
/// <remarks>
/// <para>
/// This method converts <paramref name="path"/> to URL-decoded string and removes <c>'/'</c>
/// from tail end of <paramref name="path"/>.
/// </para>
/// <para>
/// <paramref name="constructor"/> returns a initialized specified typed
/// <see cref="WebSocketService"/> instance.
/// </para>
/// </remarks>
/// <param name="path">
/// A <see cref="string"/> that represents the absolute path to the WebSocket service to add.
/// </param>
/// <param name="constructor">
/// A Func&lt;T&gt; delegate that references the method used to initialize a new specified
/// typed <see cref="WebSocketService"/> instance (a new <see cref="IWebSocketSession"/>
/// instance).
/// </param>
/// <typeparam name="T">
/// The type of the WebSocket service. The T must inherit the <see cref="WebSocketService"/>
/// class.
/// </typeparam>
public void AddWebSocketService<T> (string path, Func<T> constructor)
where T : WebSocketService
{
var msg = path.CheckIfValidServicePath () ??
(constructor == null ? "'constructor' must not be null." : null);
if (msg != null) {
_logger.Error (String.Format ("{0}\nservice path: {1}", msg, path));
return;
}
var host = new WebSocketServiceHost<T> (path, constructor, _logger);
if (!KeepClean)
host.KeepClean = false;
_services.Add (host.Path, host);
}
/// <summary>
/// Removes the WebSocket service with the specified <paramref name="path"/>.
/// </summary>
/// <remarks>
/// This method converts <paramref name="path"/> to URL-decoded string and removes <c>'/'</c>
/// from tail end of <paramref name="path"/>.
/// </remarks>
/// <returns>
/// <c>true</c> if the WebSocket service is successfully found and removed; otherwise,
/// <c>false</c>.
/// </returns>
/// <param name="path">
/// A <see cref="string"/> that represents the absolute path to the WebSocket service to find.
/// </param>
public bool RemoveWebSocketService (string path)
{
var msg = path.CheckIfValidServicePath ();
if (msg != null) {
_logger.Error (String.Format ("{0}\nservice path: {1}", msg, path));
return false;
}
return _services.Remove (path);
}
/// <summary>
/// Starts receiving the WebSocket connection requests.
/// </summary>
public void Start ()
{
lock (_sync) {
var msg = _state.CheckIfStartable () ?? checkIfCertExists ();
if (msg != null) {
_logger.Error (String.Format ("{0}\nstate: {1}\nsecure: {2}", msg, _state, _secure));
return;
}
_services.Start ();
_listener.Start ();
startReceiving ();
_state = ServerState.Start;
}
}
/// <summary>
/// Stops receiving the WebSocket connection requests.
/// </summary>
public void Stop ()
{
lock (_sync) {
var msg = _state.CheckIfStart ();
if (msg != null) {
_logger.Error (String.Format ("{0}\nstate: {1}", msg, _state));
return;
}
_state = ServerState.ShuttingDown;
}
stopListener (5000);
_services.Stop (new byte [0], true);
_state = ServerState.Stop;
}
/// <summary>
/// Stops receiving the WebSocket connection requests with the specified <see cref="ushort"/>
/// and <see cref="string"/>.
/// </summary>
/// <param name="code">
/// A <see cref="ushort"/> that represents the status code indicating the reason for stop.
/// </param>
/// <param name="reason">
/// A <see cref="string"/> that represents the reason for stop.
/// </param>
public void Stop (ushort code, string reason)
{
byte [] data = null;
lock (_sync) {
var msg = _state.CheckIfStart () ??
code.CheckIfValidCloseStatusCode () ??
(data = code.Append (reason)).CheckIfValidControlData ("reason");
if (msg != null) {
_logger.Error (
String.Format ("{0}\nstate: {1}\ncode: {2}\nreason: {3}", msg, _state, code, reason));
return;
}
_state = ServerState.ShuttingDown;
}
stopListener (5000);
_services.Stop (data, !code.IsReserved ());
_state = ServerState.Stop;
}
/// <summary>
/// Stops receiving the WebSocket connection requests with the specified
/// <see cref="CloseStatusCode"/> and <see cref="string"/>.
/// </summary>
/// <param name="code">
/// One of the <see cref="CloseStatusCode"/> enum values, represents the status code indicating
/// the reason for stop.
/// </param>
/// <param name="reason">
/// A <see cref="string"/> that represents the reason for stop.
/// </param>
public void Stop (CloseStatusCode code, string reason)
{
byte [] data = null;
lock (_sync) {
var msg = _state.CheckIfStart () ??
(data = ((ushort) code).Append (reason)).CheckIfValidControlData ("reason");
if (msg != null) {
_logger.Error (String.Format ("{0}\nstate: {1}\nreason: {2}", msg, _state, reason));
return;
}
_state = ServerState.ShuttingDown;
}
stopListener (5000);
_services.Stop (data, !code.IsReserved ());
_state = ServerState.Stop;
}
#endregion
}
}