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1835 lines (1667 loc) · 45.5 KB
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#region License
/*
* WebSocketServer.cs
*
* The MIT License
*
* Copyright (c) 2012-2015 sta.blockhead
* Copyright © 2017 Nivloc Enterprises Ltd
*
* 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>
* - Jonas Hovgaard <j@jhovgaard.dk>
* - Liryna <liryna.stark@gmail.com>
* - Rohan Singh <rohan-singh@hotmail.com>
*/
#endregion
using System;
using System.Collections.Generic;
#if SSHARP
using Crestron.SimplSharp;
using SSMono.Threading;
using TcpListener = Crestron.SimplSharp.CrestronSockets.CrestronListenerSocket;
using TcpClient = Crestron.SimplSharp.CrestronSockets.CrestronServerSocket;
using Activator = Crestron.SimplSharp.Reflection.ActivatorEx;
using SocketException = SSMono.Net.Sockets.SocketException;
using SSMono.Security.Principal;
using SSMono.Net;
using SSMono.Net.Sockets;
using SSMono.Web;
using HttpUtility = WebSocketSharp.Net.HttpUtility;
using NetworkCredential = WebSocketSharp.Net.NetworkCredential;
#else
using System.Net.Sockets;
using System.Security.Cryptography.X509Certificates;
using System.Threading;
using System.Security.Principal;
#endif
using System.Text;
using WebSocketSharp.Net;
using WebSocketSharp.Net.WebSockets;
namespace WebSocketSharp.Server
{
public class RecoverableSocketEventArgs : EventArgs
{
public SocketError SocketError;
}
/// <summary>
/// Provides a WebSocket protocol server.
/// </summary>
/// <remarks>
/// This class can provide multiple WebSocket services.
/// </remarks>
public class WebSocketServer
{
#region Private Fields
private const int MAXIMUM_CONNECTIONS_DEFAULT = 16;
private IPAddress _address;
private bool _allowForwardedRequest;
private AuthenticationSchemes _authSchemes;
private static readonly string _defaultRealm;
private bool _dnsStyle;
private string _hostname;
private TcpListener _listener;
private Logger _log;
private int _port;
private string _realm;
private string _realmInUse;
private Thread _receiveThread;
private bool _reuseAddress;
private bool _secure;
private WebSocketServiceManager _services;
#if !NETCF || BCC || SSL
private ServerSslConfiguration _sslConfig;
private ServerSslConfiguration _sslConfigInUse;
#endif
private volatile ServerState _state;
private object _sync;
private Func<IIdentity, NetworkCredential> _userCredFinder;
private int _maxConnections;
#if SSHARP
private int _retryInterval = 1000;
#endif
#endregion
#if SSHARP
#region Public Events
public delegate void RecoverableSocketeventHandler (object sender, RecoverableSocketEventArgs e);
public event RecoverableSocketeventHandler RecoverableSocketEvent;
#endregion
#endif
#region Static Constructor
static WebSocketServer ()
{
_defaultRealm = "SECRET AREA";
}
#endregion
#region Public Constructors
/// <summary>
/// Initializes a new instance of the <see cref="WebSocketServer"/> class.
/// </summary>
/// <remarks>
/// The new instance listens for incoming handshake requests on
/// <see cref="System.Net.IPAddress.Any"/> and port 80.
/// </remarks>
public WebSocketServer ()
{
var addr = IPAddress.Any;
init (addr.ToString (), addr, 80, false
#if SSHARP
, MAXIMUM_CONNECTIONS_DEFAULT
#endif
);
}
/// <summary>
/// Initializes a new instance of the <see cref="WebSocketServer"/> class with the specified
/// <paramref name="port"/>.
/// </summary>
/// <remarks>
/// <para>
/// The new instance listens for incoming handshake requests on
/// <see cref="System.Net.IPAddress.Any"/> and <paramref name="port"/>.
/// </para>
/// <para>
/// It provides secure connections if <paramref name="port"/> is 443.
/// </para>
/// </remarks>
/// <param name="port">
/// An <see cref="int"/> that represents the number of the port
/// on which to listen.
/// </param>
/// <exception cref="ArgumentOutOfRangeException">
/// <paramref name="port"/> is less than 1 or greater than 65535.
/// </exception>
public WebSocketServer (int port)
: this (port, port == 443)
{
}
#if SSHARP
/// <summary>
/// Initializes a new instance of the <see cref="WebSocketServer"/> class with the specified
/// <paramref name="port"/>.
/// </summary>
/// <remarks>
/// <para>
/// The new instance listens for incoming handshake requests on
/// <see cref="System.Net.IPAddress.Any"/> and <paramref name="port"/>.
/// </para>
/// <para>
/// If <paramref name="port"/> is 443, that instance provides a secure connection.
/// </para>
/// </remarks>
/// <param name="port">
/// An <see cref="int"/> that represents the number of the port
/// on which to listen.
/// </param>
/// <param name="maxConnections">
/// An <see cref="int"/> that represents the maximum number of simultaneous connections.
/// </param>
/// <exception cref="ArgumentOutOfRangeException">
/// <paramref name="port"/> isn't between 1 and 65535 inclusive.
/// </exception>
public WebSocketServer (int port, int maxConnections)
: this (IPAddress.Any, port, port == 443, maxConnections)
{
}
#endif
#if SSHARP
/// <summary>
/// Initializes a new instance of the <see cref="WebSocketServer"/> class with the specified
/// <paramref name="url"/>.
/// </summary>
/// <remarks>
/// <para>
/// The new instance listens for incoming handshake requests on
/// the IP address of the host of <paramref name="url"/> and
/// the port of <paramref name="url"/>.
/// </para>
/// <para>
/// Either port 80 or 443 is used if <paramref name="url"/> includes
/// no port. Port 443 is used if the scheme of <paramref name="url"/>
/// is wss; otherwise, port 80 is used.
/// </para>
/// <para>
/// The new instance provides secure connections if the scheme of
/// <paramref name="url"/> is wss.
/// </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">
/// <para>
/// <paramref name="url"/> is an empty string.
/// </para>
/// <para>
/// -or-
/// </para>
/// <para>
/// <paramref name="url"/> is invalid.
/// </para>
/// </exception>
public WebSocketServer (string url)
: this (url, MAXIMUM_CONNECTIONS_DEFAULT)
{
}
#endif
/// <summary>
/// Initializes a new instance of the <see cref="WebSocketServer"/> class with the specified
/// <paramref name="url"/>.
/// </summary>
/// <remarks>
/// <para>
/// The new instance listens for incoming handshake requests on
/// the local IP address of the host of <paramref name="url"/> and
/// the port of <paramref name="url"/>.
/// </para>
/// <para>
/// Either port 80 or 443 is used if <paramref name="url"/> includes
/// no port. Port 443 is used if the scheme of <paramref name="url"/>
/// is wss; otherwise, port 80 is used.
/// </para>
/// <para>
/// That instance provides secure connections if the scheme of
/// <paramref name="url"/> is wss.
/// </para>
/// </remarks>
/// <param name="url">
/// A <see cref="string"/> that represents the WebSocket URL
/// on which to listen.
/// </param>
/// <exception cref="ArgumentNullException">
/// <paramref name="url"/> is <see langword="null"/>.
/// </exception>
/// <exception cref="ArgumentException">
/// <para>
/// <paramref name="url"/> is an empty string.
/// </para>
/// <para>
/// -or-
/// </para>
/// <para>
/// <paramref name="url"/> is invalid.
/// </para>
/// </exception>
/// <param name="maxConnections">
/// An <see cref="int"/> that represents the maximum number of simultaneous connections.
/// </param>
public WebSocketServer (
string url
#if SSHARP
, int maxConnections
#endif
)
{
if (url == null)
throw new ArgumentNullException ("url");
if (url.Length == 0)
throw new ArgumentException ("An empty string.", "url");
Uri uri;
string msg;
if (!tryCreateUri (url, out uri, out msg))
throw new ArgumentException (msg, "url");
var host = uri.DnsSafeHost;
var addr = host.ToIPAddress ();
if (addr == null)
{
msg = "IThe host part could not be converted to an IP address.";
throw new ArgumentException (msg, "url");
}
if (!addr.IsLocal ())
{
msg = "The IP address of the host is not a local IP address.";
throw new ArgumentException (msg, "url");
}
init (host, addr, uri.Port, uri.Scheme == "wss"
#if SSHARP
, maxConnections
#endif
);
}
/// <summary>
/// Initializes a new instance of the <see cref="WebSocketServer"/> class with the specified
/// <paramref name="port"/> and <paramref name="secure"/>.
/// </summary>
/// <remarks>
/// The new instance listens for incoming handshake requests on
/// <see cref="System.Net.IPAddress.Any"/> and <paramref name="port"/>.
/// </remarks>
/// <param name="port">
/// An <see cref="int"/> that represents the number of the port
/// on which to listen.
/// </param>
/// <param name="secure">
/// A <see cref="bool"/>: <c>true</c> if the new instance provides
/// secure connections; otherwise, <c>false</c>.
/// </param>
/// <exception cref="ArgumentOutOfRangeException">
/// <paramref name="port"/> is less than 1 or greater than 65535.
/// </exception>
public WebSocketServer (int port, bool secure)
{
if (!port.IsPortNumber ())
{
var msg = "Less than 1 or greater than 65535.";
throw new ArgumentOutOfRangeException ("port", msg);
}
var addr = IPAddress.Any;
init (addr.ToString (), addr, port, secure
#if SSHARP
, MAXIMUM_CONNECTIONS_DEFAULT
#endif
);
}
/// <summary>
/// Initializes a new instance of the <see cref="WebSocketServer"/> class with the specified
/// <paramref name="address"/> and <paramref name="port"/>.
/// </summary>
/// <remarks>
/// <para>
/// The new instance listens for incoming handshake requests on
/// <paramref name="address"/> and <paramref name="port"/>.
/// </para>
/// <para>
/// It provides secure connections if <paramref name="port"/> is 443.
/// </para>
/// </remarks>
/// <param name="address">
/// A <see cref="System.Net.IPAddress"/> that represents the local IP address on which to listen.
/// </param>
/// <param name="port">
/// An <see cref="int"/> that represents the number of the port
/// on which to listen.
/// </param>
/// <exception cref="ArgumentNullException">
/// <paramref name="address"/> is <see langword="null"/>.
/// </exception>
/// <exception cref="ArgumentException">
/// <paramref name="address"/> is not a local IP address.
/// </exception>
/// <exception cref="ArgumentOutOfRangeException">
/// <paramref name="port"/> is less than 1 or greater than 65535.
/// </exception>
public WebSocketServer (IPAddress address, int port)
: this (address, port, port == 443
#if SSHARP
, MAXIMUM_CONNECTIONS_DEFAULT
#endif
)
{
}
#if SSHARP
/// <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 requests on
/// <paramref name="address"/> and <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 number of
/// the port on which to listen.
/// </param>
/// <param name="secure">
/// A <see cref="bool"/>: <c>true</c> if the new instance provides
/// secure connections; otherwise, <c>false</c>.
/// </param>
/// <exception cref="ArgumentException">
/// <paramref name="address"/> isn't a local IP address.
/// </exception>
/// <exception cref="ArgumentNullException">
/// <paramref name="address"/> is <see langword="null"/>.
/// </exception>
/// <exception cref="ArgumentOutOfRangeException">
/// <paramref name="port"/> isn't between 1 and 65535 inclusive.
/// </exception>
public WebSocketServer (IPAddress address, int port, bool secure)
: this (address, port, secure, MAXIMUM_CONNECTIONS_DEFAULT)
{
}
#endif
/// <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>
/// The new instance listens for the incoming handshake requests on
/// <paramref name="address"/> and <paramref name="port"/>.
/// </remarks>
/// <param name="address">
/// A <see cref="System.Net.IPAddress"/> that represents the local IP address for 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 specifies providing secure connections or not.
/// <c>true</c> specifies providing secure connections.
/// </param>
#if SSHARP
/// <param name="maxConnections">
/// An <see cref="int"/> that represents the maximum number of simultaneous connections.
/// </param>
#endif
/// <exception cref="ArgumentNullException">
/// <paramref name="address"/> is <see langword="null"/>.
/// </exception>
/// <exception cref="ArgumentException">
/// <paramref name="address"/> is not a local IP address.
/// </exception>
/// <exception cref="ArgumentOutOfRangeException">
/// <paramref name="port"/> is less than 1 or greater than 65535.
/// </exception>
public WebSocketServer (
IPAddress address, int port, bool secure
#if SSHARP
, int maxConnections
#endif
)
{
if (address == null)
throw new ArgumentNullException ("address");
if (!address.IsLocal ())
throw new ArgumentException ("Not a local IP address.", "address");
if (!port.IsPortNumber ())
{
var msg = "Less than 1 or greater than 65535.";
throw new ArgumentOutOfRangeException ("port", msg);
}
init (null, address, port, secure
#if SSHARP
, maxConnections
#endif
);
}
#endregion
#region Public Properties
/// <summary>
/// Gets the IP address of the server.
/// </summary>
/// <value>
/// A <see cref="System.Net.IPAddress"/> that represents the local
/// IP address on which to listen for incoming handshake requests.
/// </value>
public IPAddress Address
{
get { return _address; }
}
/// <summary>
/// Gets or sets a value indicating whether the server accepts every
/// handshake request without checking the request URI.
/// </summary>
/// <remarks>
/// The set operation does nothing if the server has already started or
/// it is shutting down.
/// </remarks>
/// <value>
/// <para>
/// <c>true</c> if the server accepts every handshake request without
/// checking the request URI; otherwise, <c>false</c>.
/// </para>
/// <para>
/// The default value is <c>false</c>.
/// </para>
/// </value>
public bool AllowForwardedRequest
{
get
{
return _allowForwardedRequest;
}
set
{
string msg;
if (!canSet (out msg))
{
_log.Warn (msg);
return;
}
lock (_sync)
{
if (!canSet (out msg))
{
_log.Warn (msg);
return;
}
_allowForwardedRequest = value;
}
}
}
/// <summary>
/// Gets or sets the scheme used to authenticate the clients.
/// </summary>
/// <remarks>
/// The set operation does nothing if the server has already started or
/// it is shutting down.
/// </remarks>
/// <value>
/// <para>
/// One of the <see cref="WebSocketSharp.Net.AuthenticationSchemes"/>
/// enum values.
/// </para>
/// <para>
/// It represents the scheme used to authenticate the clients.
/// </para>
/// <para>
/// The default value is
/// <see cref="WebSocketSharp.Net.AuthenticationSchemes.Anonymous"/>.
/// </para>
/// </value>
public AuthenticationSchemes AuthenticationSchemes
{
get { return _authSchemes; }
set
{
string msg;
if (!canSet (out msg))
{
_log.Warn (msg);
return;
}
lock (_sync)
{
if (!canSet (out msg))
{
_log.Warn (msg);
return;
}
_authSchemes = 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 secure connections are provided.
/// </summary>
/// <value>
/// <c>true</c> if this instance provides secure connections; 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>
/// <remarks>
/// The set operation does nothing if the server has already started or
/// it is shutting down.
/// </remarks>
/// <value>
/// <para>
/// <c>true</c> if the server cleans up the inactive sessions
/// every 60 seconds; otherwise, <c>false</c>.
/// </para>
/// <para>
/// The default value is <c>true</c>.
/// </para>
/// </value>
public bool KeepClean
{
get { return _services.KeepClean; }
set
{
_services.KeepClean = value;
}
}
/// <summary>
/// Gets the logging function for the server.
/// </summary>
/// <remarks>
/// The default logging level is <see cref="LogLevel.Error"/>.
/// </remarks>
/// <value>
/// A <see cref="Logger"/> that provides the logging function.
/// </value>
public Logger Log
{
get { return _log; }
}
/// <summary>
/// Gets the port of the server.
/// </summary>
/// <value>
/// An <see cref="int"/> that represents the number of the port
/// on which to listen for incoming handshake requests.
/// </value>
public int Port
{
get { return _port; }
}
/// <summary>
/// Gets or sets the realm used for authentication.
/// </summary>
/// <remarks>
/// <para>
/// "SECRET AREA" is used as the realm if the value is
/// <see langword="null"/> or an empty string.
/// </para>
/// <para>
/// The set operation does nothing if the server has
/// already started or it is shutting down.
/// </para>
/// </remarks>
/// <value>
/// <para>
/// A <see cref="string"/> or <see langword="null"/> by default.
/// </para>
/// <para>
/// That string represents the name of the realm.
/// </para>
/// </value>
public string Realm
{
get { return _realm; }
set
{
string msg;
if (!canSet (out msg))
{
_log.Warn (msg);
return;
}
lock (_sync)
{
if (!canSet (out msg))
{
_log.Warn (msg);
return;
}
_realm = value;
}
}
}
#if SSHARP
public int RetryInterval
{
get { return _retryInterval; }
set
{
if (value < 0)
throw new ArgumentOutOfRangeException ("value", "must be >= 0");
string msg;
if (!canSet (out msg))
{
_log.Warn (msg);
return;
}
lock (_sync)
{
if (!canSet (out msg))
{
_log.Warn (msg);
return;
}
_retryInterval = value;
}
}
}
#endif
/// <summary>
/// Gets or sets a value indicating whether the server is allowed to
/// be bound to an address that is already in use.
/// </summary>
/// <remarks>
/// <para>
/// You should set this property to <c>true</c> if you would
/// like to resolve to wait for socket in TIME_WAIT state.
/// </para>
/// <para>
/// The set operation does nothing if the server has already started or
/// it is shutting down.
/// </para>
/// </remarks>
/// <value>
/// <para>
/// <c>true</c> if the server is allowed to be bound to an address
/// that is already in use; otherwise, <c>false</c>.
/// </para>
/// <para>
/// The default value is <c>false</c>.
/// </para>
/// </value>
public bool ReuseAddress
{
get { return _reuseAddress; }
set
{
string msg;
if (!canSet (out msg))
{
_log.Warn (msg);
return;
}
lock (_sync)
{
if (!canSet (out msg))
{
_log.Warn (msg);
return;
}
_reuseAddress = value;
}
}
}
#if !NETCF || BCC || SSL
/// <summary>
/// Gets the configuration for secure connection.
/// </summary>
/// <remarks>
/// This configuration will be referenced when attempts to start,
/// so it must be configured before the start method is called.
/// </remarks>
/// <value>
/// A <see cref="ServerSslConfiguration"/> that represents
/// the configuration used to provide secure connections.
/// </value>
/// <exception cref="InvalidOperationException">
/// This instance does not provide secure connections.
/// </exception>
public ServerSslConfiguration SslConfiguration
{
get
{
if (!_secure)
{
var msg = "This instance does not provide secure connections.";
throw new InvalidOperationException (msg);
}
return getSslConfiguration ();
}
}
#endif
/// <summary>
/// Gets or sets the delegate used to find the credentials for an identity.
/// </summary>
/// <remarks>
/// <para>
/// No credentials are found if the method invoked by
/// the delegate returns <see langword="null"/> or
/// the value is <see langword="null"/>.
/// </para>
/// <para>
/// The set operation does nothing if the server has already
/// started or it is shutting down.
/// </para>
/// </remarks>
/// <value>
/// <para>
/// A <c>Func<<see cref="IIdentity"/>,
/// <see cref="NetworkCredential"/>></c> delegate or
/// <see langword="null"/> if not needed.
/// </para>
/// <para>
/// That delegate invokes the method called for finding
/// the credentials used to authenticate a client.
/// </para>
/// <para>
/// The default value is <see langword="null"/>.
/// </para>
/// </value>
public Func<IIdentity, NetworkCredential> UserCredentialsFinder
{
get { return _userCredFinder; }
set
{
string msg;
if (!canSet (out msg))
{
_log.Warn (msg);
return;
}
lock (_sync)
{
if (!canSet (out msg))
{
_log.Warn (msg);
return;
}
_userCredFinder = value;
}
}
}
/// <summary>
/// Gets or sets the time to wait for the response to the WebSocket Ping or
/// Close.
/// </summary>
/// <remarks>
/// The set operation does nothing if the server has already started or
/// it is shutting down.
/// </remarks>
/// <value>
/// <para>
/// A <see cref="TimeSpan"/> to wait for the response.
/// </para>
/// <para>
/// The default value is the same as 1 second.
/// </para>
/// </value>
/// <exception cref="ArgumentOutOfRangeException">
/// The value specified for a set operation is zero or less.
/// </exception>
public TimeSpan WaitTime
{
get { return _services.WaitTime; }
set
{
_services.WaitTime = value;
}
}
/// <summary>
/// A <see cref="WebSocketServiceManager"/> that manages
/// 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 (_state != ServerState.Start)
return;
_state = ServerState.ShuttingDown;
}
try
{
try
{
_listener.Stop ();
}
finally
{
_services.Stop (1006, String.Empty);
}
}
catch
{
}
_state = ServerState.Stop;
}
private bool authenticateClient (TcpListenerWebSocketContext context)
{
if (_authSchemes == AuthenticationSchemes.Anonymous)
return true;
if (_authSchemes == AuthenticationSchemes.None)
return false;
return context.Authenticate (_authSchemes, _realmInUse, _userCredFinder);
}
private bool canSet (out string message)
{
message = null;
if (_state == ServerState.Start)
{
message = "The server has already started.";
return false;
}
if (_state == ServerState.ShuttingDown)
{
message = "The server is shutting down.";
return false;
}
return true;
}
private bool checkHostNameForRequest (string name)
{
return !_dnsStyle || Uri.CheckHostName (name) != UriHostNameType.Dns || name == _hostname;
}
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