jellyfin/SocketHttpListener/Net/HttpConnection.cs

538 lines
16 KiB
C#

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