jellyfin-server/SocketHttpListener/Net/HttpEndPointListener.cs
2018-12-30 22:44:39 +01:00

540 lines
18 KiB
C#

using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Security.Cryptography.X509Certificates;
using System.Threading;
using MediaBrowser.Model.Cryptography;
using MediaBrowser.Model.IO;
using Microsoft.Extensions.Logging;
using MediaBrowser.Model.Net;
using MediaBrowser.Model.System;
using MediaBrowser.Model.Text;
using SocketHttpListener.Primitives;
using ProtocolType = MediaBrowser.Model.Net.ProtocolType;
using SocketType = MediaBrowser.Model.Net.SocketType;
using System.Threading.Tasks;
namespace SocketHttpListener.Net
{
internal sealed class HttpEndPointListener
{
private HttpListener _listener;
private IPEndPoint _endpoint;
private Socket _socket;
private Dictionary<ListenerPrefix, HttpListener> _prefixes;
private List<ListenerPrefix> _unhandledPrefixes; // host = '*'
private List<ListenerPrefix> _allPrefixes; // host = '+'
private X509Certificate _cert;
private bool _secure;
private Dictionary<HttpConnection, HttpConnection> _unregisteredConnections;
private readonly ILogger _logger;
private bool _closed;
private bool _enableDualMode;
private readonly ICryptoProvider _cryptoProvider;
private readonly ISocketFactory _socketFactory;
private readonly ITextEncoding _textEncoding;
private readonly IStreamHelper _streamHelper;
private readonly IFileSystem _fileSystem;
private readonly IEnvironmentInfo _environment;
public HttpEndPointListener(HttpListener listener, IPAddress addr, int port, bool secure, X509Certificate cert, ILogger logger, ICryptoProvider cryptoProvider, ISocketFactory socketFactory, IStreamHelper streamHelper, ITextEncoding textEncoding, IFileSystem fileSystem, IEnvironmentInfo environment)
{
this._listener = listener;
_logger = logger;
_cryptoProvider = cryptoProvider;
_socketFactory = socketFactory;
_streamHelper = streamHelper;
_textEncoding = textEncoding;
_fileSystem = fileSystem;
_environment = environment;
this._secure = secure;
this._cert = cert;
_enableDualMode = addr.Equals(IPAddress.IPv6Any);
_endpoint = new IPEndPoint(addr, port);
_prefixes = new Dictionary<ListenerPrefix, HttpListener>();
_unregisteredConnections = new Dictionary<HttpConnection, HttpConnection>();
CreateSocket();
}
internal HttpListener Listener
{
get
{
return _listener;
}
}
private void CreateSocket()
{
try
{
_socket = CreateSocket(_endpoint.Address.AddressFamily, _enableDualMode);
}
catch (SocketCreateException ex)
{
if (_enableDualMode && _endpoint.Address.Equals(IPAddress.IPv6Any) &&
(string.Equals(ex.ErrorCode, "AddressFamilyNotSupported", StringComparison.OrdinalIgnoreCase) ||
// mono 4.8.1 and lower on bsd is throwing this
string.Equals(ex.ErrorCode, "ProtocolNotSupported", StringComparison.OrdinalIgnoreCase) ||
// mono 5.2 on bsd is throwing this
string.Equals(ex.ErrorCode, "OperationNotSupported", StringComparison.OrdinalIgnoreCase)))
{
_endpoint = new IPEndPoint(IPAddress.Any, _endpoint.Port);
_enableDualMode = false;
_socket = CreateSocket(_endpoint.Address.AddressFamily, _enableDualMode);
}
else
{
throw;
}
}
try
{
_socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
}
catch (SocketException)
{
// This is not supported on all operating systems (qnap)
}
_socket.Bind(_endpoint);
// This is the number TcpListener uses.
_socket.Listen(2147483647);
Accept();
_closed = false;
}
private void Accept()
{
var acceptEventArg = new SocketAsyncEventArgs();
acceptEventArg.UserToken = this;
acceptEventArg.Completed += new EventHandler<SocketAsyncEventArgs>(OnAccept);
Accept(acceptEventArg);
}
private static void TryCloseAndDispose(Socket socket)
{
try
{
using (socket)
{
socket.Close();
}
}
catch
{
}
}
private static void TryClose(Socket socket)
{
try
{
socket.Close();
}
catch
{
}
}
private void Accept(SocketAsyncEventArgs acceptEventArg)
{
// acceptSocket must be cleared since the context object is being reused
acceptEventArg.AcceptSocket = null;
try
{
bool willRaiseEvent = _socket.AcceptAsync(acceptEventArg);
if (!willRaiseEvent)
{
ProcessAccept(acceptEventArg);
}
}
catch (ObjectDisposedException)
{
}
catch (Exception ex)
{
HttpEndPointListener epl = (HttpEndPointListener)acceptEventArg.UserToken;
epl._logger.LogError(ex, "Error in socket.AcceptAsync");
}
}
// This method is the callback method associated with Socket.AcceptAsync
// operations and is invoked when an accept operation is complete
//
private static void OnAccept(object sender, SocketAsyncEventArgs e)
{
ProcessAccept(e);
}
private static async void ProcessAccept(SocketAsyncEventArgs args)
{
HttpEndPointListener epl = (HttpEndPointListener)args.UserToken;
if (epl._closed)
{
return;
}
// http://msdn.microsoft.com/en-us/library/system.net.sockets.acceptSocket.acceptasync%28v=vs.110%29.aspx
// Under certain conditions ConnectionReset can occur
// Need to attept to re-accept
var socketError = args.SocketError;
var accepted = args.AcceptSocket;
epl.Accept(args);
if (socketError == SocketError.ConnectionReset)
{
epl._logger.LogError("SocketError.ConnectionReset reported. Attempting to re-accept.");
return;
}
if(accepted == null)
{
return;
}
if (epl._secure && epl._cert == null)
{
TryClose(accepted);
return;
}
try
{
var remoteEndPointString = accepted.RemoteEndPoint == null ? string.Empty : accepted.RemoteEndPoint.ToString();
var localEndPointString = accepted.LocalEndPoint == null ? string.Empty : accepted.LocalEndPoint.ToString();
//_logger.LogInformation("HttpEndPointListener Accepting connection from {0} to {1} secure connection requested: {2}", remoteEndPointString, localEndPointString, _secure);
HttpConnection conn = new HttpConnection(epl._logger, accepted, epl, epl._secure, epl._cert, epl._cryptoProvider, epl._streamHelper, epl._textEncoding, epl._fileSystem, epl._environment);
await conn.Init().ConfigureAwait(false);
//_logger.LogDebug("Adding unregistered connection to {0}. Id: {1}", accepted.RemoteEndPoint, connectionId);
lock (epl._unregisteredConnections)
{
epl._unregisteredConnections[conn] = conn;
}
conn.BeginReadRequest();
}
catch (Exception ex)
{
epl._logger.LogError(ex, "Error in ProcessAccept");
TryClose(accepted);
epl.Accept();
return;
}
}
private Socket CreateSocket(AddressFamily addressFamily, bool dualMode)
{
try
{
var socket = new Socket(addressFamily, System.Net.Sockets.SocketType.Stream, System.Net.Sockets.ProtocolType.Tcp);
if (dualMode)
{
socket.DualMode = true;
}
return socket;
}
catch (SocketException ex)
{
throw new SocketCreateException(ex.SocketErrorCode.ToString(), ex);
}
catch (ArgumentException ex)
{
if (dualMode)
{
// Mono for BSD incorrectly throws ArgumentException instead of SocketException
throw new SocketCreateException("AddressFamilyNotSupported", ex);
}
else
{
throw;
}
}
}
internal void RemoveConnection(HttpConnection conn)
{
lock (_unregisteredConnections)
{
_unregisteredConnections.Remove(conn);
}
}
public bool BindContext(HttpListenerContext context)
{
HttpListenerRequest req = context.Request;
ListenerPrefix prefix;
HttpListener listener = SearchListener(req.Url, out prefix);
if (listener == null)
return false;
context.Connection.Prefix = prefix;
return true;
}
public void UnbindContext(HttpListenerContext context)
{
if (context == null || context.Request == null)
return;
_listener.UnregisterContext(context);
}
private HttpListener SearchListener(Uri uri, out ListenerPrefix prefix)
{
prefix = null;
if (uri == null)
return null;
string host = uri.Host;
int port = uri.Port;
string path = WebUtility.UrlDecode(uri.AbsolutePath);
string pathSlash = path[path.Length - 1] == '/' ? path : path + "/";
HttpListener bestMatch = null;
int bestLength = -1;
if (host != null && host != "")
{
Dictionary<ListenerPrefix, HttpListener> localPrefixes = _prefixes;
foreach (ListenerPrefix p in localPrefixes.Keys)
{
string ppath = p.Path;
if (ppath.Length < bestLength)
continue;
if (p.Host != host || p.Port != port)
continue;
if (path.StartsWith(ppath) || pathSlash.StartsWith(ppath))
{
bestLength = ppath.Length;
bestMatch = localPrefixes[p];
prefix = p;
}
}
if (bestLength != -1)
return bestMatch;
}
List<ListenerPrefix> list = _unhandledPrefixes;
bestMatch = MatchFromList(host, path, list, out prefix);
if (path != pathSlash && bestMatch == null)
bestMatch = MatchFromList(host, pathSlash, list, out prefix);
if (bestMatch != null)
return bestMatch;
list = _allPrefixes;
bestMatch = MatchFromList(host, path, list, out prefix);
if (path != pathSlash && bestMatch == null)
bestMatch = MatchFromList(host, pathSlash, list, out prefix);
if (bestMatch != null)
return bestMatch;
return null;
}
private HttpListener MatchFromList(string host, string path, List<ListenerPrefix> list, out ListenerPrefix prefix)
{
prefix = null;
if (list == null)
return null;
HttpListener bestMatch = null;
int bestLength = -1;
foreach (ListenerPrefix p in list)
{
string ppath = p.Path;
if (ppath.Length < bestLength)
continue;
if (path.StartsWith(ppath))
{
bestLength = ppath.Length;
bestMatch = p._listener;
prefix = p;
}
}
return bestMatch;
}
private void AddSpecial(List<ListenerPrefix> list, ListenerPrefix prefix)
{
if (list == null)
return;
foreach (ListenerPrefix p in list)
{
if (p.Path == prefix.Path)
throw new Exception("net_listener_already");
}
list.Add(prefix);
}
private bool RemoveSpecial(List<ListenerPrefix> list, ListenerPrefix prefix)
{
if (list == null)
return false;
int c = list.Count;
for (int i = 0; i < c; i++)
{
ListenerPrefix p = list[i];
if (p.Path == prefix.Path)
{
list.RemoveAt(i);
return true;
}
}
return false;
}
private void CheckIfRemove()
{
if (_prefixes.Count > 0)
return;
List<ListenerPrefix> list = _unhandledPrefixes;
if (list != null && list.Count > 0)
return;
list = _allPrefixes;
if (list != null && list.Count > 0)
return;
HttpEndPointManager.RemoveEndPoint(this, _endpoint);
}
public void Close()
{
_closed = true;
_socket.Close();
lock (_unregisteredConnections)
{
// Clone the list because RemoveConnection can be called from Close
var connections = new List<HttpConnection>(_unregisteredConnections.Keys);
foreach (HttpConnection c in connections)
c.Close(true);
_unregisteredConnections.Clear();
}
}
public void AddPrefix(ListenerPrefix prefix, HttpListener listener)
{
List<ListenerPrefix> current;
List<ListenerPrefix> future;
if (prefix.Host == "*")
{
do
{
current = _unhandledPrefixes;
future = current != null ? new List<ListenerPrefix>(current) : new List<ListenerPrefix>();
prefix._listener = listener;
AddSpecial(future, prefix);
} while (Interlocked.CompareExchange(ref _unhandledPrefixes, future, current) != current);
return;
}
if (prefix.Host == "+")
{
do
{
current = _allPrefixes;
future = current != null ? new List<ListenerPrefix>(current) : new List<ListenerPrefix>();
prefix._listener = listener;
AddSpecial(future, prefix);
} while (Interlocked.CompareExchange(ref _allPrefixes, future, current) != current);
return;
}
Dictionary<ListenerPrefix, HttpListener> prefs, p2;
do
{
prefs = _prefixes;
if (prefs.ContainsKey(prefix))
{
throw new Exception("net_listener_already");
}
p2 = new Dictionary<ListenerPrefix, HttpListener>(prefs);
p2[prefix] = listener;
} while (Interlocked.CompareExchange(ref _prefixes, p2, prefs) != prefs);
}
public void RemovePrefix(ListenerPrefix prefix, HttpListener listener)
{
List<ListenerPrefix> current;
List<ListenerPrefix> future;
if (prefix.Host == "*")
{
do
{
current = _unhandledPrefixes;
future = current != null ? new List<ListenerPrefix>(current) : new List<ListenerPrefix>();
if (!RemoveSpecial(future, prefix))
break; // Prefix not found
} while (Interlocked.CompareExchange(ref _unhandledPrefixes, future, current) != current);
CheckIfRemove();
return;
}
if (prefix.Host == "+")
{
do
{
current = _allPrefixes;
future = current != null ? new List<ListenerPrefix>(current) : new List<ListenerPrefix>();
if (!RemoveSpecial(future, prefix))
break; // Prefix not found
} while (Interlocked.CompareExchange(ref _allPrefixes, future, current) != current);
CheckIfRemove();
return;
}
Dictionary<ListenerPrefix, HttpListener> prefs, p2;
do
{
prefs = _prefixes;
if (!prefs.ContainsKey(prefix))
break;
p2 = new Dictionary<ListenerPrefix, HttpListener>(prefs);
p2.Remove(prefix);
} while (Interlocked.CompareExchange(ref _prefixes, p2, prefs) != prefs);
CheckIfRemove();
}
}
}