internal void NextRead()
{
lock (this)
{
if (Data.Request != null)
Data.Request.FinishedReading = true;
var header = _sPoint.UsesProxy ? "Proxy-Connection" : "Connection";
var cncHeader = null != Data.Headers ? Data.Headers[header] : null;
var keepAlive = Data.Version == HttpVersion.Version11 && _keepAlive;
if (cncHeader != null)
{
cncHeader = cncHeader.ToLower();
keepAlive = (_keepAlive && cncHeader.IndexOf("keep-alive", StringComparison.Ordinal) != -1);
}
if ((!keepAlive || (cncHeader != null && cncHeader.IndexOf("close", StringComparison.Ordinal) != -1)))
Close(false);
_state.SetIdle();
if (_priorityRequest != null)
{
SendRequest(_priorityRequest);
_priorityRequest = null;
}
else
SendNext();
}
}
async Task InitConnectionAsync(HttpWebRequest request)
{
request.WebConnection = this;
if (request.ReuseConnection)
request.StoredConnection = this;
if (request.Aborted)
return;
_keepAlive = request.KeepAlive;
Data = new WebConnectionData(request);
retry:
await ConnectAsync(request).ConfigureAwait(false);
if (request.Aborted)
return;
if (_status != WebExceptionStatus.Success)
{
if (!request.Aborted)
{
request.SetWriteStreamError(_status, _connectException);
Close(true);
}
return;
}
if (!await CreateStreamAsync(request).ConfigureAwait(false))
{
if (request.Aborted)
return;
var st = _status;
if (Data.Challenge != null)
goto retry;
var cncExc = _connectException;
_connectException = null;
request.SetWriteStreamError(st, cncExc);
Close(true);
return;
}
await request.SetWriteStreamAsync(new WebConnectionStream(this, request)).ConfigureAwait(false);
}
internal EventHandler SendRequest(HttpWebRequest request)
{
if (request.Aborted)
return null;
lock (this)
{
if (_state.TrySetBusy())
{
_status = WebExceptionStatus.Success;
var task = InitConnectionAsync(request);
task.ContinueWith(t =>
{
var ex = t.Exception;
if (null != ex)
Debug.WriteLine("InitConnectionAsync failed: " + ex.Message);
});
}
else
{
lock (_queue)
{
#if MONOTOUCH
if (!warned_about_queue) {
warned_about_queue = true;
Console.WriteLine ("WARNING: An HttpWebRequest was added to the ConnectionGroup queue because the connection limit was reached.");
}
#endif
_queue.Enqueue(request);
}
}
}
return _abortHandler;
}
byte[] CreateConnectBytes(HttpWebRequest request, Uri connectUri, out bool haveAuth)
{
var sb = new StringBuilder();
sb.Append("CONNECT ");
sb.Append(request.Address.Host);
sb.Append(':');
sb.Append(request.Address.Port);
sb.Append(" HTTP/");
if (request.ServicePoint.ProtocolVersion == HttpVersion.Version11)
sb.Append("1.1");
else
sb.Append("1.0");
sb.Append("\r\nHost: ");
sb.Append(request.Address.Authority);
var ntlm = false;
var challenge = Data.Challenge;
Data.Challenge = null;
var authHeader = request.Headers["Proxy-Authorization"];
haveAuth = authHeader != null;
if (haveAuth)
{
sb.Append("\r\nProxy-Authorization: ");
sb.Append(authHeader);
ntlm = authHeader.ToUpper().Contains("NTLM");
}
else if (challenge != null && Data.StatusCode == 407)
{
var creds = request.Proxy.Credentials;
haveAuth = true;
if (_connectRequest == null)
{
// create a CONNECT request to use with Authenticate
_connectRequest = (HttpWebRequest)WebRequest.Create(
connectUri.Scheme + "://" + connectUri.Host + ":" + connectUri.Port.ToString(CultureInfo.InvariantCulture) + "/");
_connectRequest.Method = "CONNECT";
_connectRequest.Credentials = creds;
}
foreach (var c in challenge)
{
var auth = AuthenticationManager.Authenticate(c, _connectRequest, creds);
if (auth == null)
continue;
ntlm = (auth.Module.AuthenticationType == "NTLM");
sb.Append("\r\nProxy-Authorization: ");
sb.Append(auth.Message);
break;
}
}
if (ntlm)
{
sb.Append("\r\nProxy-Connection: keep-alive");
_connectNtlmAuthState++;
}
sb.Append("\r\n\r\n");
Data.StatusCode = 0;
var connectBytes = Encoding.UTF8.GetBytes(sb.ToString());
return connectBytes;
}
async Task<bool> CreateStreamAsync(HttpWebRequest request)
{
try
{
var serverStream = new StreamSocketStream(_socket, false);
_ssl = request.Address.Scheme == Uri.UriSchemeHttps;
_nstream = serverStream;
}
catch (Exception)
{
if (!request.Aborted)
_status = WebExceptionStatus.ConnectFailure;
return false;
}
return true;
}
async Task ConnectAsync(HttpWebRequest request)
{
var isLocked = false;
try
{
Monitor.TryEnter(_socketLock, ref isLocked);
if (_socket != null && _status == WebExceptionStatus.Success)
{
// Take the chunked stream to the expected state (State.None)
if (CanReuse() && await CompleteChunkedReadAsync(CancellationToken.None).ConfigureAwait(false))
{
_reused = true;
return;
}
}
_reused = false;
if (_socket != null)
{
_socket.Dispose();
_socket = null;
}
_chunkStream = null;
}
finally
{
if (isLocked)
Monitor.Exit(_socketLock);
}
var hostEntry = await _sPoint.GetHostEntryAsync().ConfigureAwait(false);
if (hostEntry == null)
{
#if MONOTOUCH
monotouch_start_wwan (sPoint.Address.ToString ());
hostEntry = sPoint.HostEntry;
if (hostEntry == null) {
#endif
_status = _sPoint.UsesProxy ? WebExceptionStatus.ProxyNameResolutionFailure :
WebExceptionStatus.NameResolutionFailure;
return;
#if MONOTOUCH
}
#endif
}
foreach (var address in hostEntry.AddressList)
{
lock (_socketLock)
{
if (null != _socket)
{
_socket.Dispose();
_socket = null;
}
try
{
_socket = new StreamSocket();
}
catch (Exception se)
{
// The Socket ctor can throw if we run out of FD's
if (!request.Aborted)
_status = WebExceptionStatus.ConnectFailure;
_connectException = se;
return;
}
_socket.Control.NoDelay = !_sPoint.UseNagleAlgorithm;
try
{
_sPoint.KeepAliveSetup(_socket);
}
catch
{
// Ignore. Not supported in all platforms.
}
}
var port = _sPoint.Address.Port;
var remote = new IPEndPoint(address, port);
IPEndPoint local;
if (!_sPoint.GetLocalEndPointFromDelegate(remote, out local))
{
StreamSocket s;
lock (_socketLock)
{
s = _socket;
_socket = null;
_status = WebExceptionStatus.ConnectFailure;
}
if (s != null)
s.Dispose();
return;
}
try
{
if (request.Aborted)
return;
var remoteHostName = new HostName(request.RequestUri.Host);
var remoteServiceName = port.ToString(CultureInfo.InvariantCulture);
await _socket.ConnectAsync(remoteHostName, remoteServiceName, _ssl ? SocketProtectionLevel.Ssl : SocketProtectionLevel.PlainSocket).AsTask().ConfigureAwait(false);
_status = WebExceptionStatus.Success;
break;
}
catch (ThreadAbortException)
{
// program exiting...
StreamSocket s;
lock (_socketLock)
{
s = _socket;
_socket = null;
}
if (s != null)
s.Dispose();
return;
}
catch (ObjectDisposedException)
{
// socket closed from another thread
return;
}
catch (Exception exc)
{
StreamSocket s;
lock (_socketLock)
{
s = _socket;
_socket = null;
if (!request.Aborted)
_status = WebExceptionStatus.ConnectFailure;
}
if (s != null)
s.Dispose();
_connectException = exc;
}
}
}
async Task<bool> CreateTunnelAsync(HttpWebRequest request, Uri connectUri,
StreamSocketStream stream /*, out byte[] buffer */)
{
bool haveAuth;
var connectBytes = CreateConnectBytes(request, connectUri, out haveAuth);
await stream.WriteAsync(connectBytes, 0, connectBytes.Length).ConfigureAwait(false);
var readHeaders = await ReadHeadersAsync(stream).ConfigureAwait(false);
var status = readHeaders.Item1;
var result = readHeaders.Item2;
if ((!haveAuth || _connectNtlmAuthState == NtlmAuthState.Challenge) &&
result != null && status == 407)
{
// Needs proxy auth
var connectionHeader = result["Connection"];
if (_socket != null && !string.IsNullOrEmpty(connectionHeader) &&
connectionHeader.ToLower() == "close")
{
// The server is requesting that this connection be closed
_socket.Dispose();
_socket = null;
}
Data.StatusCode = status;
Data.Challenge = result.GetValues_internal("Proxy-Authenticate", false);
return false;
}
if (status != 200)
{
var msg = String.Format("The remote server returned a {0} status code.", status);
HandleError(WebExceptionStatus.SecureChannelFailure, null, msg);
return false;
}
return result != null;
}
//internal IAsyncResult BeginWrite(HttpWebRequest request, byte[] buffer, int offset, int size, AsyncCallback cb, object state)
//{
// Stream s = null;
// lock (this)
// {
// if (Data.Request != request)
// throw new ObjectDisposedException(typeof (StreamSocketStream).FullName);
// if (_nstream == null)
// return null;
// s = _nstream;
// }
// IAsyncResult result = null;
// try
// {
// result = s.BeginWrite(buffer, offset, size, cb, state);
// var x = s.WriteAsync(buffer, offset, size).ConfigureAwait(false)
// }
// catch (Exception)
// {
// _status = WebExceptionStatus.SendFailure;
// throw;
// }
// return result;
//}
//internal bool EndWrite(HttpWebRequest request, bool throwOnError, IAsyncResult result)
//{
// if (request.FinishedReading)
// return true;
// Stream s = null;
// lock (this)
// {
// if (Data.Request != request)
// throw new ObjectDisposedException(typeof(StreamSocketStream).FullName);
// if (_nstream == null)
// throw new ObjectDisposedException(typeof(StreamSocketStream).FullName);
// s = _nstream;
// }
// try
// {
// s.EndWrite(result);
// return true;
// }
// catch (Exception exc)
// {
// _status = WebExceptionStatus.SendFailure;
// if (throwOnError && exc.InnerException != null)
// throw exc.InnerException;
// return false;
// }
//}
//internal int Read(HttpWebRequest request, byte[] buffer, int offset, int size)
//{
// Stream s = null;
// lock (this)
// {
// if (Data.Request != request)
// throw new ObjectDisposedException(typeof(StreamSocketStream).FullName);
// if (_nstream == null)
// return 0;
// s = _nstream;
// }
// var result = 0;
// try
// {
// var done = false;
// if (!_chunkedRead)
// {
// result = s.Read(buffer, offset, size);
// done = (result == 0);
// }
// if (_chunkedRead)
// {
// try
// {
// _chunkStream.WriteAndReadBack(buffer, offset, size, ref result);
// if (!done && result == 0 && _chunkStream.WantMore)
// result = EnsureReadAsync(buffer, offset, size);
// }
// catch (Exception e)
// {
// HandleError(WebExceptionStatus.ReceiveFailure, e, "chunked Read1");
// throw;
// }
// if ((done || result == 0) && _chunkStream.WantMore)
// {
// HandleError(WebExceptionStatus.ReceiveFailure, null, "chunked Read2");
// throw new WebException("Read error", null, WebExceptionStatus.ReceiveFailure, null);
// }
// }
// }
// catch (Exception e)
// {
// HandleError(WebExceptionStatus.ReceiveFailure, e, "Read");
// }
// return result;
//}
internal bool Write(HttpWebRequest request, byte[] buffer, int offset, int size, ref string err_msg)
{
err_msg = null;
Stream s = null;
lock (this)
{
if (Data.Request != request)
throw new ObjectDisposedException(typeof(StreamSocketStream).FullName);
s = _nstream;
if (s == null)
return false;
}
try
{
s.Write(buffer, offset, size);
// here SSL handshake should have been done
if (_ssl && !_certsAvailable)
GetCertificates(s);
}
catch (Exception e)
{
err_msg = e.Message;
var wes = WebExceptionStatus.SendFailure;
var msg = "Write: " + err_msg;
if (e is WebException)
{
HandleError(wes, e, msg);
return false;
}
// if SSL is in use then check for TrustFailure
if (_ssl)
{
#if SECURITY_DEP && MONOTOUCH
HttpsClientStream https = (s as HttpsClientStream);
if (https.TrustFailure) {
#else
if ((bool)_piTrustFailure.GetValue(s, null))
{
#endif
wes = WebExceptionStatus.TrustFailure;
msg = "Trust failure";
}
}
HandleError(wes, e, msg);
return false;
}
return true;
}
internal void Close(bool sendNext)
{
lock (this)
{
if (Data != null && Data.Request != null && Data.Request.ReuseConnection)
{
Data.Request.ReuseConnection = false;
return;
}
if (_nstream != null)
{
try
{
_nstream.Close();
}
catch
{ }
_nstream = null;
}
if (_socket != null)
{
try
{
_socket.Dispose();
}
catch
{ }
_socket = null;
}
if (_ntlmAuthenticated)
ResetNtlm();
if (Data != null)
{
lock (Data)
{
Data.ReadState = ReadState.Aborted;
}
}
_state.SetIdle();
Data = new WebConnectionData();
if (sendNext)
SendNext();
_connectRequest = null;
_connectNtlmAuthState = NtlmAuthState.None;
}
}
void Abort(object sender, EventArgs args)
{
lock (this)
{
lock (_queue)
{
var req = (HttpWebRequest)sender;
if (Data.Request == req || Data.Request == null)
{
if (!req.FinishedReading)
{
_status = WebExceptionStatus.RequestCanceled;
Close(false);
if (_queue.Count > 0)
{
Data.Request = _queue.Dequeue();
SendRequest(Data.Request);
}
}
return;
}
req.FinishedReading = true;
req.SetResponseError(WebExceptionStatus.RequestCanceled, null, "User aborted");
if (_queue.Count > 0 && _queue.Peek() == sender)
_queue.Dequeue();
else if (_queue.Count > 0)
{
var old = _queue.ToArray();
_queue.Clear();
for (var i = old.Length - 1; i >= 0; i--)
{
if (old[i] != sender)
_queue.Enqueue(old[i]);
}
}
}
}
}
internal async Task<bool> WriteAsync(HttpWebRequest request, byte[] buffer, int offset, int size, CancellationToken cancellationToken)
{
Stream s;
lock (this)
{
if (Data.Request != request)
throw new ObjectDisposedException(typeof(StreamSocketStream).FullName);
if (_nstream == null)
throw new InvalidOperationException("No stream available");
s = _nstream;
}
try
{
await s.WriteAsync(buffer, offset, size, cancellationToken).ConfigureAwait(false);
return true;
}
catch (Exception exc)
{
_status = WebExceptionStatus.SendFailure;
if (exc.InnerException != null)
throw exc.InnerException;
}
return request.FinishedReading;
}
internal async Task FlushAsync(HttpWebRequest request, CancellationToken cancellationToken)
{
Stream s;
lock (this)
{
if (Data.Request != request)
throw new ObjectDisposedException(typeof(StreamSocketStream).FullName);
if (_nstream == null)
throw new InvalidOperationException("No stream available");
s = _nstream;
}
try
{
await s.FlushAsync(cancellationToken).ConfigureAwait(false);
}
catch (Exception exc)
{
_status = WebExceptionStatus.SendFailure;
if (exc.InnerException != null)
throw exc.InnerException;
}
}
internal async Task<int> ReadAsync(HttpWebRequest request, byte[] buffer, int offset, int size, CancellationToken cancellationToken)
{
//Debug.WriteLine("WebConnection.ReadAsync(buffer, {0}, {1}, cancellationToken)", offset, size);
StreamSocketStream s;
lock (this)
{
if (Data.Request != request)
throw new ObjectDisposedException(typeof(StreamSocketStream).FullName);
if (_nstream == null)
throw new InvalidOperationException("No stream available");
s = _nstream;
}
var nbytes = 0;
var done = false;
if (!_chunkedRead || (!_chunkStream.DataAvailable && _chunkStream.WantMore))
{
try
{
//Debug.WriteLine("WebConnection.ReadAsync(buffer, {0}, {1}, cancellationToken) calling socket read, chunkedRead {2} dataAvail {3} wantMore {4}",
// offset, size, _chunkedRead,
// null == _chunkStream ? "<null>" : _chunkStream.DataAvailable.ToString(),
// null == _chunkStream ? "<null>" : _chunkStream.WantMore.ToString());
nbytes = await s.ReadAsync(buffer, offset, size, cancellationToken).ConfigureAwait(false);
done = nbytes == 0;
//Debug.WriteLine("WebConnection.ReadAsync(buffer, {0}, {1}, cancellationToken) socket read returned, chunkedRead {2} dataAvail {3} wantMore {4} nbytes {5}",
// offset, size, _chunkedRead,
// null == _chunkStream ? "<null>" : _chunkStream.DataAvailable.ToString(),
// null == _chunkStream ? "<null>" : _chunkStream.WantMore.ToString(),
// nbytes);
//DumpBase64(buffer, offset, nbytes);
}
catch (Exception)
{
HandleError(WebExceptionStatus.ReceiveFailure, null, "chunked ReadAsync");
throw;
}
}
//Debug.WriteLine("WebConnection.ReadAsync(buffer, {0}, {1}, cancellationToken) read {2} done {3}", offset, size, nbytes, done);
lock (this)
{
if (Data.Request != request)
throw new ObjectDisposedException(typeof(StreamSocketStream).FullName);
if (_nstream == null)
throw new ObjectDisposedException(typeof(StreamSocketStream).FullName);
s = _nstream;
}
if (_chunkedRead)
{
try
{
//Debug.WriteLine("WebConnection.ReadAsync(buffer, {0}, {1}, cancellationToken) calling WriteAndReadBack {2}", offset, size, nbytes);
_chunkStream.WriteAndReadBack(buffer, offset, size, ref nbytes);
if (!done && nbytes == 0 && _chunkStream.WantMore)
{
nbytes = await EnsureReadAsync(buffer, offset, size, cancellationToken).ConfigureAwait(false);
//Debug.WriteLine("WebConnection.ReadAsync(buffer, {0}, {1}, cancellationToken) EnsureReadAsync returned {2}", offset, size, nbytes);
}
}
catch (Exception e)
{
if (e is WebException)
throw;
throw new WebException("Invalid chunked data.", e,
WebExceptionStatus.ServerProtocolViolation, null);
}
if ((done || nbytes == 0) && _chunkStream.ChunkLeft != 0)
{
HandleError(WebExceptionStatus.ReceiveFailure, null, "chunked EndRead");
throw new WebException("Read error", null, WebExceptionStatus.ReceiveFailure, null);
}
}
var ret = (nbytes != 0) ? nbytes : -1;
//Debug.WriteLine("WebConnection.ReadAsync(buffer, {0}, {1}, cancellationToken) returning {2} (nbytes {3})", offset, size, ret, nbytes);
return ret;
}
public WebAsyncResult(HttpWebRequest request, AsyncCallback cb, object state)
{
this.cb = cb;
this.state = state;
}
