538 lines
16 KiB
C#
538 lines
16 KiB
C#
using System;
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using System.IO;
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using System.Net;
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using System.Net.Security;
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using System.Net.Sockets;
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using System.Security.Authentication;
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using System.Security.Cryptography.X509Certificates;
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using System.Text;
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using System.Threading;
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using System.Threading.Tasks;
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using MediaBrowser.Model.Cryptography;
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using MediaBrowser.Model.IO;
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using MediaBrowser.Model.System;
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using Microsoft.Extensions.Logging;
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namespace SocketHttpListener.Net
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{
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sealed class HttpConnection
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{
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private static AsyncCallback s_onreadCallback = new AsyncCallback(OnRead);
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const int BufferSize = 8192;
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Socket _socket;
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Stream _stream;
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HttpEndPointListener _epl;
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MemoryStream _memoryStream;
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byte[] _buffer;
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HttpListenerContext _context;
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StringBuilder _currentLine;
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ListenerPrefix _prefix;
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HttpRequestStream _requestStream;
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HttpResponseStream _responseStream;
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bool _chunked;
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int _reuses;
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bool _contextBound;
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bool secure;
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int _timeout = 90000; // 90k ms for first request, 15k ms from then on
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private Timer _timer;
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IPEndPoint local_ep;
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HttpListener _lastListener;
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X509Certificate cert;
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SslStream ssl_stream;
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private readonly ILogger _logger;
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private readonly ICryptoProvider _cryptoProvider;
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private readonly IStreamHelper _streamHelper;
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private readonly IFileSystem _fileSystem;
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private readonly IEnvironmentInfo _environment;
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public HttpConnection(ILogger logger, Socket socket, HttpEndPointListener epl, bool secure,
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X509Certificate cert, ICryptoProvider cryptoProvider, IStreamHelper streamHelper, IFileSystem fileSystem,
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IEnvironmentInfo environment)
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{
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_logger = logger;
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this._socket = socket;
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this._epl = epl;
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this.secure = secure;
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this.cert = cert;
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_cryptoProvider = cryptoProvider;
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_streamHelper = streamHelper;
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_fileSystem = fileSystem;
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_environment = environment;
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if (secure == false)
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{
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_stream = new SocketStream(_socket, false);
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}
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else
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{
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ssl_stream = new SslStream(new SocketStream(_socket, false), false, (t, c, ch, e) =>
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{
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if (c == null)
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{
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return true;
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}
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//var c2 = c as X509Certificate2;
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//if (c2 == null)
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//{
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// c2 = new X509Certificate2(c.GetRawCertData());
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//}
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//_clientCert = c2;
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//_clientCertErrors = new int[] { (int)e };
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return true;
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});
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_stream = ssl_stream;
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}
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}
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public Stream Stream => _stream;
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public async Task Init()
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{
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_timer = new Timer(OnTimeout, null, Timeout.Infinite, Timeout.Infinite);
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if (ssl_stream != null)
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{
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var enableAsync = true;
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if (enableAsync)
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{
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await ssl_stream.AuthenticateAsServerAsync(cert, false, (SslProtocols)ServicePointManager.SecurityProtocol, false).ConfigureAwait(false);
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}
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else
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{
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ssl_stream.AuthenticateAsServer(cert, false, (SslProtocols)ServicePointManager.SecurityProtocol, false);
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}
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}
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InitInternal();
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}
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private void InitInternal()
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{
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_contextBound = false;
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_requestStream = null;
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_responseStream = null;
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_prefix = null;
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_chunked = false;
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_memoryStream = new MemoryStream();
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_position = 0;
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_inputState = InputState.RequestLine;
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_lineState = LineState.None;
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_context = new HttpListenerContext(this);
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}
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public bool IsClosed => (_socket == null);
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public int Reuses => _reuses;
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public IPEndPoint LocalEndPoint
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{
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get
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{
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if (local_ep != null)
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return local_ep;
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local_ep = (IPEndPoint)_socket.LocalEndPoint;
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return local_ep;
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}
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}
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public IPEndPoint RemoteEndPoint => _socket.RemoteEndPoint as IPEndPoint;
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public bool IsSecure => secure;
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public ListenerPrefix Prefix
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{
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get => _prefix;
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set => _prefix = value;
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}
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private void OnTimeout(object unused)
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{
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//_logger.LogInformation("HttpConnection timer fired");
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CloseSocket();
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Unbind();
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}
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public void BeginReadRequest()
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{
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if (_buffer == null)
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_buffer = new byte[BufferSize];
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try
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{
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if (_reuses == 1)
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_timeout = 15000;
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//_timer.Change(_timeout, Timeout.Infinite);
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_stream.BeginRead(_buffer, 0, BufferSize, s_onreadCallback, this);
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}
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catch
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{
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//_timer.Change(Timeout.Infinite, Timeout.Infinite);
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CloseSocket();
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Unbind();
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}
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}
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public HttpRequestStream GetRequestStream(bool chunked, long contentlength)
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{
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if (_requestStream == null)
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{
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byte[] buffer = _memoryStream.GetBuffer();
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int length = (int)_memoryStream.Length;
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_memoryStream = null;
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if (chunked)
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{
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_chunked = true;
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//_context.Response.SendChunked = true;
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_requestStream = new ChunkedInputStream(_context, _stream, buffer, _position, length - _position);
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}
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else
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{
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_requestStream = new HttpRequestStream(_stream, buffer, _position, length - _position, contentlength);
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}
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}
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return _requestStream;
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}
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public HttpResponseStream GetResponseStream(bool isExpect100Continue = false)
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{
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// TODO: can we get this _stream before reading the input?
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if (_responseStream == null)
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{
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var supportsDirectSocketAccess = !_context.Response.SendChunked && !isExpect100Continue && !secure;
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_responseStream = new HttpResponseStream(_stream, _context.Response, false, _streamHelper, _socket, supportsDirectSocketAccess, _environment, _fileSystem, _logger);
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}
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return _responseStream;
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}
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private static void OnRead(IAsyncResult ares)
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{
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var cnc = (HttpConnection)ares.AsyncState;
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cnc.OnReadInternal(ares);
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}
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private void OnReadInternal(IAsyncResult ares)
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{
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//_timer.Change(Timeout.Infinite, Timeout.Infinite);
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int nread = -1;
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try
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{
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nread = _stream.EndRead(ares);
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_memoryStream.Write(_buffer, 0, nread);
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if (_memoryStream.Length > 32768)
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{
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SendError("Bad Request", 400);
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Close(true);
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return;
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}
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}
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catch
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{
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if (_memoryStream != null && _memoryStream.Length > 0)
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SendError();
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if (_socket != null)
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{
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CloseSocket();
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Unbind();
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}
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return;
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}
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if (nread == 0)
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{
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CloseSocket();
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Unbind();
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return;
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}
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if (ProcessInput(_memoryStream))
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{
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if (!_context.HaveError)
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_context.Request.FinishInitialization();
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if (_context.HaveError)
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{
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SendError();
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Close(true);
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return;
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}
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if (!_epl.BindContext(_context))
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{
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const int NotFoundErrorCode = 404;
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SendError(HttpStatusDescription.Get(NotFoundErrorCode), NotFoundErrorCode);
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Close(true);
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return;
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}
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HttpListener listener = _epl.Listener;
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if (_lastListener != listener)
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{
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RemoveConnection();
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listener.AddConnection(this);
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_lastListener = listener;
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}
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_contextBound = true;
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listener.RegisterContext(_context);
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return;
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}
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_stream.BeginRead(_buffer, 0, BufferSize, s_onreadCallback, this);
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}
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private void RemoveConnection()
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{
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if (_lastListener == null)
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_epl.RemoveConnection(this);
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else
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_lastListener.RemoveConnection(this);
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}
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private enum InputState
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{
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RequestLine,
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Headers
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}
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private enum LineState
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{
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None,
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CR,
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LF
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}
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InputState _inputState = InputState.RequestLine;
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LineState _lineState = LineState.None;
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int _position;
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// true -> done processing
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// false -> need more input
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private bool ProcessInput(MemoryStream ms)
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{
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byte[] buffer = ms.GetBuffer();
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int len = (int)ms.Length;
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int used = 0;
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string line;
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while (true)
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{
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if (_context.HaveError)
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return true;
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if (_position >= len)
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break;
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try
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{
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line = ReadLine(buffer, _position, len - _position, ref used);
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_position += used;
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}
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catch
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{
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_context.ErrorMessage = "Bad request";
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_context.ErrorStatus = 400;
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return true;
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}
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if (line == null)
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break;
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if (line == "")
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{
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if (_inputState == InputState.RequestLine)
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continue;
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_currentLine = null;
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ms = null;
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return true;
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}
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if (_inputState == InputState.RequestLine)
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{
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_context.Request.SetRequestLine(line);
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_inputState = InputState.Headers;
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}
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else
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{
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try
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{
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_context.Request.AddHeader(line);
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}
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catch (Exception e)
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{
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_context.ErrorMessage = e.Message;
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_context.ErrorStatus = 400;
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return true;
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}
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}
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}
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if (used == len)
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{
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ms.SetLength(0);
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_position = 0;
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}
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return false;
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}
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private string ReadLine(byte[] buffer, int offset, int len, ref int used)
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{
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if (_currentLine == null)
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_currentLine = new StringBuilder(128);
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int last = offset + len;
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used = 0;
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for (int i = offset; i < last && _lineState != LineState.LF; i++)
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{
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used++;
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byte b = buffer[i];
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if (b == 13)
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{
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_lineState = LineState.CR;
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}
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else if (b == 10)
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{
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_lineState = LineState.LF;
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}
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else
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{
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_currentLine.Append((char)b);
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}
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}
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string result = null;
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if (_lineState == LineState.LF)
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{
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_lineState = LineState.None;
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result = _currentLine.ToString();
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_currentLine.Length = 0;
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}
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return result;
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}
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public void SendError(string msg, int status)
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{
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try
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{
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HttpListenerResponse response = _context.Response;
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response.StatusCode = status;
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response.ContentType = "text/html";
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string description = HttpStatusDescription.Get(status);
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string str;
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if (msg != null)
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str = string.Format("<h1>{0} ({1})</h1>", description, msg);
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else
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str = string.Format("<h1>{0}</h1>", description);
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byte[] error = Encoding.UTF8.GetBytes(str);
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response.Close(error, false);
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}
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catch
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{
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// response was already closed
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}
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}
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public void SendError()
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{
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SendError(_context.ErrorMessage, _context.ErrorStatus);
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}
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private void Unbind()
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{
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if (_contextBound)
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{
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_epl.UnbindContext(_context);
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_contextBound = false;
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}
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}
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public void Close()
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{
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Close(false);
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}
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private void CloseSocket()
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{
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if (_socket == null)
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return;
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try
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{
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_socket.Close();
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}
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catch { }
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finally
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{
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_socket = null;
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}
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RemoveConnection();
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}
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internal void Close(bool force)
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{
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if (_socket != null)
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{
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Stream st = GetResponseStream();
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if (st != null)
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st.Close();
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_responseStream = null;
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}
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if (_socket != null)
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{
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force |= !_context.Request.KeepAlive;
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if (!force)
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force = (string.Equals(_context.Response.Headers["connection"], "close", StringComparison.OrdinalIgnoreCase));
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if (!force && _context.Request.FlushInput())
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{
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if (_chunked && _context.Response.ForceCloseChunked == false)
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{
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// Don't close. Keep working.
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_reuses++;
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Unbind();
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InitInternal();
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BeginReadRequest();
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return;
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}
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_reuses++;
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Unbind();
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InitInternal();
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BeginReadRequest();
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return;
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}
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Socket s = _socket;
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_socket = null;
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try
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{
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if (s != null)
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s.Shutdown(SocketShutdown.Both);
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}
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catch
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{
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}
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finally
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{
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if (s != null)
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{
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try
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{
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s.Close();
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}
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catch { }
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}
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}
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Unbind();
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RemoveConnection();
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return;
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}
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}
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}
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}
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